Korea Electric Power (KEP) 20-F 28 Apr 23 2022 FY Annual report (foreign) Financial data

Cover Page

Cover Page	12 Months Ended
	Dec. 31, 2022 shares
Document Information [Line Items]
Entity Registrant Name	KOREA ELECTRIC POWER CORPORATION
Entity Central Index Key	0000887225
Document Type	20-F
Document Period End Date	Dec. 31, 2022
Amendment Flag	false
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding	641,964,077
Entity Interactive Data Current	Yes
Document Annual Report	true
Document Transition Report	false
Document Shell Company Report	false
Document Registration Statement	false
ICFR Auditor Attestation Flag	true
Entity File Number	001-13372
Entity Incorporation, State or Country Code	M5
Entity Address, Address Line One	55 Jeollyeok-ro
Entity Address, City or Town	Naju-si
Entity Address, Country	KR
Entity Address, Postal Zip Code	58322
Document Accounting Standard	International Financial Reporting Standards
Auditor Name	Ernst & Young Han Young
Auditor Firm ID	1437
Auditor Location	Seoul, Korea
Business Contact [Member]
Document Information [Line Items]
Entity Address, Address Line One	55 Jeollyeok-ro
Entity Address, City or Town	Naju-si
Entity Address, Country	KR
Entity Address, Postal Zip Code	58322
Contact Personnel Name	Nayoung Kim
City Area Code	61
Local Phone Number	345 4213
Contact Personnel Email Address	nayoung.kim@kepco.co.kr
Common Stock
Document Information [Line Items]
Trading Symbol	KEP
Title of 12(b) Security	Common stock, par value Won 5,000 per share
Security Exchange Name	NYSE
ADS
Document Information [Line Items]
Trading Symbol	KEP
Title of 12(b) Security	American depositary shares, each representing one-half of share of common stock
Security Exchange Name	NYSE

Consolidated Statements of Fina

Consolidated Statements of Financial Position - KRW (₩) ₩ in Millions		Dec. 31, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents (Notes 5,6,7 and 45)		₩ 3,234,780	₩ 2,635,238
Current financial assets, net (Notes 5,6,9,11,12,13,45 and 47)		4,286,975	1,868,796
Trade and other receivables, net (Notes 5,8,20,24,45,46 and 47)		10,461,822	8,122,415
Inventories, net (Note 14)		9,930,732	7,608,182
Income tax receivables (Note 41)		46,619	41,344
Current non-financial assets (Note 15)		1,744,869	1,758,991
Assets held for sale (Note 16 and 42)		44,748	15,879
Total current assets		29,750,545	22,050,845
Non-current assets
Non-current financial assets, net (Notes 5,6,9,10,11,12,13,45 and 47)		3,336,835	2,909,810
Non-current trade and other receivables, net (Notes 5,8,20,45,46 and 47)		2,153,080	1,906,861
Property, plant and equipment, net (Notes 18,24,27 and 49)		177,865,308	173,134,638
Investment properties, net (Notes 19 and 27)		208,286	212,784
Goodwill (Note 16)		100,093	105,647
Intangible assets other than goodwill, net (Notes 21,27 and 46)		956,664	1,044,077
Investments in associates (Notes 4 and 17)		5,844,464	5,232,373
Investments in joint ventures (Notes 4 and 17)		3,147,584	2,239,011
Defined benefit assets, net (Note 25)		198,626	20,871
Deferred tax assets (Note 41)		10,934,375	1,901,992
Non-current non-financial assets (Note 15)		309,134	364,818
Total non-current assets		205,054,449	189,072,882
Total Assets (Notes 2 and 4)		234,804,994	211,123,727
Current liabilities
Trade and other payables, net (Notes 5,22,24,45 and 47)		11,983,549	8,153,426
Current financial liabilities, net (Notes 5,12,23,45 and 47)		22,703,996	14,037,125
Income tax payables (Note 41)		429,604	229,460
Current non-financial liabilities (Notes 20,28 and 29)		6,974,377	6,466,333
Current provisions (Notes 26 and 45)		2,427,051	2,845,876
Total current liabilities		44,518,577	31,732,220
Non-current liabilities
Non-current trade and other payables, net (Notes 5,22,24,45 and 47)		5,638,914	5,996,498
Non-current financial liabilities, net (Notes 5,12,23,45 and 47)		98,334,120	66,570,419
Non-current non-financial liabilities (Notes 28 and 29)		10,662,661	10,216,364
Employee benefits liabilities, net (Notes 25 and 45)		828,721	1,679,158
Deferred tax liabilities (Note 41)		6,457,103	7,100,938
Non-current provisions (Notes 26 and 45)		26,364,642	22,501,424
Total non-current liabilities		148,286,161	114,064,801
Total liabilities (Note 4)		192,804,738	145,797,021
Equity
Share capital		3,209,820	3,209,820
Share premium		843,758	843,758
Contributed capital (Notes 1,30 and 45)		4,053,578	4,053,578
Legal reserves	[1]	1,604,910	1,604,910
Voluntary reserves		27,782,969	33,282,817
Unappropriated retained earnings (undisposed deficit)		(7,956,579)	10,370,517
Retained earnings (Notes 2 and 31)		21,431,300	45,258,244
Other capital surplus		1,268,569	1,231,109
Accumulated other comprehensive income (loss)		496,976	(57,632)
Other equity		13,294,973	13,294,973
Other components of equity (Note 34)		15,060,518	14,468,450
Equity attributable to owners of the controlling company		40,545,396	63,780,272
Non-controlling interests (Notes 2,16 and 33)		1,454,860	1,546,434
Total Equity (Note 2)		42,000,256	65,326,706
Total Liabilities and Equity		₩ 234,804,994	₩ 211,123,727
[1]The KEPCO Act requires KEPCO to appropriate a legal reserve equal to at least 20 percent of net income for each accounting period until the reserve equals 50 percent of KEPCO’s common stock. The legal reserve is not available for cash dividends; however, this reserve may be credited to paid-in

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of comprehensive income [abstract]
Total revenue from external customers (Notes 2,4, 35, 45, 47)	₩ 70,546,024	₩ 60,012,375	₩ 57,926,634
Sales of goods	69,184,469	58,800,977	56,685,109
Sales of construction services (Note 20)	646,953	754,998	812,175
Sales of services	714,602	456,400	429,350
Cost of sales	(100,903,594)	(63,644,290)	(51,804,179)
Cost of sales (Notes 2,14,25,43 and 47)	(99,441,768)	(62,164,425)	(50,352,898)
Cost of sales of construction services	(941,254)	(898,963)	(1,009,430)
Cost of sales of services	(520,572)	(580,902)	(441,851)
Selling and administrative expenses (Notes 25,36,43 and 47)	(3,009,422)	(2,875,796)	(2,678,443)
Gross profit (loss)	(30,357,570)	(3,631,915)	6,122,455
Other income (Note 28 and 37)	1,095,489	1,034,133	1,036,448
Other expenses (Note 37)	(212,150)	(257,932)	(417,720)
Other gains (losses), net (Note 38)	243,122	8,519	35,094
Operating profit (loss) (Note 4)	(32,240,531)	(5,722,991)	4,097,834
Finance income (Notes 5,12 and 39)	1,833,312	1,402,614	1,510,249
Finance expenses (Notes 5,12 and 40)	(4,746,791)	(3,245,777)	(2,896,443)
Gain on valuation of investments in associates and joint ventures	1,393,486	775,588	398,972
Gain on disposal of investments in associates and joint ventures	11,091	1,844	10,165
Loss on valuation of investments in associates and joint ventures	(55,193)	(218,532)	(119,848)
Loss on disposal of investments in associates and joint ventures	(1,675)	(64,119)	(16)
Loss on impairment of investments in associates and joint ventures	(5,174)	0	(1,556)
Loss on disposal of investments in subsidiaries	(32,144)	(197)	(6,610)
Profit (loss) related to associates, joint ventures and subsidiaries (Notes 4,16 and 17)	1,310,391	494,584	281,107
Profit (loss) before income tax	(33,843,619)	(7,071,570)	2,992,747
Income tax benefit (expense) (Note 41)	9,414,511	1,855,989	(899,064)
Profit (loss) for the year	(24,429,108)	(5,215,581)	2,093,683
Other comprehensive income (loss), net of tax (Notes 5,12,25,31 and 34)	1,246,869	599,614	(219,841)
Items that will not be reclassified subsequently to profit or loss:
Remeasurements of defined benefit liability (Notes 25 and 31)	663,095	210,409	(69,804)
Share of other comprehensive income of associates and joint ventures	12,305	3,609	3,181
Net change in fair value of financial assets at fair value through other comprehensive income (loss)	58,010	59,024	(8,532)
Items that may be reclassified subsequently to profit or loss:
Net change in the unrealized fair value of derivatives using cash flow hedge accounting (Notes 5, 12 and 34)	(24,415)	(15,778)	64,561
Foreign currency translation of foreign operations (Note 34)	28,387	41,189	(76,442)
Share of other comprehensive income (loss) of associates and joint ventures	509,487	301,161	(132,805)
Total comprehensive income (loss) for the year	(23,182,239)	(4,615,967)	1,873,842
Profit (loss) attributable to:
Owners of the controlling company (Note 44)	(24,466,853)	(5,304,522)	1,992,077
Non-controlling interests	37,745	88,941	101,606
Profit (loss) for the year	(24,429,108)	(5,215,581)	2,093,683
Total comprehensive income (loss) attributable to:
Owners of the controlling company	(23,273,171)	(4,743,513)	1,803,554
Non-controlling interests	90,932	127,546	70,288
Total comprehensive income (loss) for the year	₩ (23,182,239)	₩ (4,615,967)	₩ 1,873,842
Earnings (loss) per share (in won) ((Notes 2 and 44)
Basic earnings (loss) per share	₩ (38,112)	₩ (8,263)	₩ 3,102
Diluted earnings (loss) per share	₩ (38,112)	₩ (8,263)	₩ 3,102

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity - KRW (₩) ₩ in Millions	Total	Equity attributable to owners of parent	Contributed capital	Retained earnings	Other Components Of Equity	Non-controlling interests
Beginning balance at Dec. 31, 2019	₩ 68,889,649	₩ 67,496,318	₩ 4,053,578	₩ 49,202,133	₩ 14,240,607	₩ 1,393,331
Comprehensive income
Profit (loss) for the year	2,093,683	1,992,077	0	1,992,077	0	101,606
Items that will not be reclassified subsequently to profit or loss:
Remeasurements of defined benefit liability, net of tax	(69,805)	(62,857)	0	(62,857)	0	(6,948)
Share of other comprehensive income of associates and joint ventures, net of tax	3,180	3,180	0	3,180	0	0
Net change in fair value of financial assets at fair value through other comprehensive income, net of tax	(8,532)	(8,533)	0	0	(8,533)	1
Items that may be reclassified subsequently to profit or loss:
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax	64,562	58,523	0	0	58,523	6,039
Foreign currency translation of foreign operations, net of tax	(76,442)	(46,032)	0	0	(46,032)	(30,410)
Share of other comprehensive loss of associates and joint ventures, net of tax	(132,805)	(132,805)	0	0	(132,805)	0
Dividends paid	(81,011)	0	0	0	0	(81,011)
Additional paid-in capital and others	(5,445)	(148)	0	0	(148)	(5,297)
Transactions between consolidated entities	(1,274)	(2,314)	0	(203)	(2,111)	1,040
Changes in consolidation scope	5,684	0	0	0	0	5,684
Dividends paid (hybrid bond)	(13,385)	0	0	0	0	(13,385)
Ending balance at Dec. 31, 2020	70,668,059	69,297,409	4,053,578	51,134,330	14,109,501	1,370,650
Comprehensive income
Profit (loss) for the year	(5,215,581)	(5,304,522)	0	(5,304,522)	0	88,941
Items that will not be reclassified subsequently to profit or loss:
Remeasurements of defined benefit liability, net of tax	210,409	201,067	0	201,067	0	9,342
Share of other comprehensive income of associates and joint ventures, net of tax	3,609	3,609	0	3,609	0	0
Net change in fair value of financial assets at fair value through other comprehensive income, net of tax	59,024	59,022	0	0	59,022	2
Items that may be reclassified subsequently to profit or loss:
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax	(15,778)	(19,610)	0	0	(19,610)	3,832
Foreign currency translation of foreign operations, net of tax	41,189	15,760	0	0	15,760	25,429
Share of other comprehensive loss of associates and joint ventures, net of tax	301,161	301,161	0	0	301,161	0
Dividends paid	(812,144)	(780,628)	0	(780,628)	0	(31,516)
Additional paid-in capital and others	75,211	(491)	0	0	(491)	75,702
Transactions between consolidated entities	(34,747)	7,452	0	0	7,452	(42,199)
Changes in consolidation scope	59,679	43	0	0	43	59,636
Dividends paid (hybrid bond)	(13,385)	0	0	0	0	(13,385)
Other changes in equity	0	0	0	4,388	(4,388)	0
Ending balance at Dec. 31, 2021	65,326,706	63,780,272	4,053,578	45,258,244	14,468,450	1,546,434
Comprehensive income
Profit (loss) for the year	(24,429,108)	(24,466,853)	0	(24,466,853)	0	37,745
Items that will not be reclassified subsequently to profit or loss:
Remeasurements of defined benefit liability, net of tax	663,095	626,769	0	626,769	0	36,326
Share of other comprehensive income of associates and joint ventures, net of tax	12,305	12,305	0	12,305	0	0
Net change in fair value of financial assets at fair value through other comprehensive income, net of tax	58,010	58,008	0	0	58,008	2
Items that may be reclassified subsequently to profit or loss:
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax	(24,415)	(32,437)	0	0	(32,437)	8,022
Foreign currency translation of foreign operations, net of tax	28,387	19,550	0	0	19,550	8,837
Share of other comprehensive loss of associates and joint ventures, net of tax	509,487	509,487	0	0	509,487	0
Dividends paid	(42,344)	0	0	0	0	(42,344)
Additional paid-in capital and others	126,792	40,476	0	835	39,641	86,316
Transactions between consolidated entities	(77,375)	(1,584)	0	0	(1,584)	(75,791)
Changes in consolidation scope	31,714	(597)	0	0	(597)	32,311
Dividends paid (hybrid bond)	(13,461)	0	0	0	0	(13,461)
Repayment of hybrid bond	(169,537)	0	0	0	0	(169,537)
Ending balance at Dec. 31, 2022	₩ 42,000,256	₩ 40,545,396	₩ 4,053,578	₩ 21,431,300	₩ 15,060,518	₩ 1,454,860

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities
Profit (loss) for the year	₩ (24,429,108)	₩ (5,215,581)	₩ 2,093,683
Adjustments to reconcile profit (loss) for the year to net cash provided by operating activities:
Income tax expense (benefit)	(9,414,511)	(1,855,989)	899,064
Depreciation	12,305,252	11,776,331	11,377,553
Amortization	156,160	166,161	170,466
Employee benefit expense	485,700	512,270	492,288
Bad debt expense	29,997	67,242	50,686
Interest expense	2,818,546	1,914,457	1,995,425
Loss on disposal of financial assets	1,841	1,045	648
Loss on disposal of property, plant and equipment	100,066	92,622	162,725
Loss on abandonment of property, plant and equipment	160,909	207,934	255,346
Loss on impairment of property, plant and equipment	(97,425)	4,056	80,413
Loss on impairment of intangible assets	164	0	3,599
Loss on disposal of intangible assets	116	145	392
Increase in provisions	2,146,979	2,466,452	1,832,765
Loss (gain) on foreign currency translation, net	523,285	997,119	(782,167)
Gain on valuation of financial assets at fair value through profit or loss	(7,099)	(14,338)	(12,904)
Loss on valuation of financial assets at fair value through profit or loss	44,329	5,480	7,396
Valuation and transaction loss (gain) on derivative instruments, net	(448,903)	(907,076)	390,322
Gain on valuation of investments in associates and joint ventures, net	(1,338,293)	(557,056)	(279,124)
Gain on disposal of financial assets	(11,199)	(7,718)	(11,992)
Reversal of impairment loss on intangible assets	0	(14)	0
Gain on disposal of property, plant and equipment	(148,667)	(56,284)	(93,195)
Gain on disposal of intangible assets	(41)	(1)	(1,556)
Gain on disposal of investments in associates and joint ventures	(11,091)	(1,844)	(10,165)
Loss on disposal of investments in associates and joint ventures	1,675	64,119	16
Impairment loss on investments in associates and joint ventures	5,174	0	1,556
Loss on disposal of investments in subsidiaries	32,144	197	6,610
Interest income	(340,753)	(221,874)	(242,586)
Dividend income	(28,875)	(10,522)	(7,316)
Others, net	215,943	(169,856)	29,198
Adjustments to reconcile profit (loss) for the year to net cash provided by operating activities	7,181,423	14,473,058	16,315,463
Changes in working capital:
Trade receivables	(1,909,649)	(216,734)	(107,639)
Non-trade receivables	80,444	869,870	459,524
Accrued income	(34,706)	(17,918)	(258,963)
Other receivables	80,236	24,306	(32,536)
Other current assets	(651,926)	(569,732)	(462,125)
Inventories	(3,000,669)	(1,738,000)	(723,495)
Other non-current assets	58,790	(3,462)	(140,017)
Trade payables	2,782,474	2,144,561	(262,985)
Non-trade payables	61,737	(571,051)	(363,260)
Accrued expenses	(191,681)	(456,992)	(222,113)
Other current liabilities	446,064	379,378	388,163
Other non-current liabilities	422,916	458,007	755,005
Investments in associates and joint ventures (dividends received)	473,700	288,242	237,695
Provisions	(1,564,243)	(2,426,017)	(1,499,436)
Payments of employee benefit obligations	(218,319)	(159,477)	(74,848)
Plan assets	(347,778)	(317,707)	(582,275)
Changes in working capital	(3,512,610)	(2,312,726)	(2,889,305)
Cash generated from operating activities	(20,760,295)	6,944,751	15,519,841
Dividends received (financial assets at fair value through other comprehensive income)	28,875	10,522	7,316
Interest paid	(2,517,694)	(1,928,160)	(2,081,663)
Interest received	220,471	201,022	215,183
Income taxes paid	(448,857)	(736,757)	(452,203)
Net cash provided by (used in) operating activities	(23,477,500)	4,491,378	13,208,474
Cash flows from investing activities
Proceeds from disposals of investments in associates and joint ventures	56,171	4,472	5,444
Acquisition of investments in associates and joint ventures	(360,962)	(673,017)	(342,116)
Proceeds from disposals of property, plant and equipment	629,924	277,998	331,777
Acquisition of property, plant and equipment	(12,346,878)	(12,686,726)	(13,281,294)
Proceeds from disposals of intangible assets	279	59	10,871
Acquisition of intangible assets	(80,508)	(113,100)	(120,371)
Disposal of investment properties	515	0	0
Proceeds from disposals of financial assets	14,182,348	7,023,674	8,020,406
Acquisition of financial assets	(16,496,258)	(5,893,404)	(9,203,450)
Increase in loans	(401,377)	(223,950)	(336,744)
Collection of loans	102,061	218,704	215,292
Increase in deposits	(237,266)	(222,924)	(276,255)
Decrease in deposits	141,000	166,066	280,941
Proceeds from disposals of assets held-for-sale	24,205	1,148	32,578
Receipt of government grants	50,755	37,920	41,209
Net cash outflow from changes in consolidation scope	(31,350)	(63,492)	(24,624)
Other cash outflow from investing activities, net	(186,412)	(225,948)	(185,476)
Net cash used in investing activities	(14,953,753)	(12,372,520)	(14,831,812)
Cash flows from financing activities
Proceeds from short-term borrowings, net	5,852,426	1,621,440	345,338
Proceeds from long-term borrowings and debt securities	43,594,078	17,392,311	10,170,107
Repayment of long-term borrowings and debt securities	(10,252,688)	(9,360,357)	(7,976,658)
Payment of lease liabilities	(562,646)	(572,036)	(613,977)
Settlement of derivative instruments, net	407,627	98,068	42,263
Change in non-controlling interests	175,645	90,096	11,554
Repayment of hybrid bond	(169,537)	0	0
Dividends paid (hybrid bond)	(13,461)	(13,385)	(13,385)
Dividends paid	(42,348)	(812,159)	(81,298)
Other cash outflow from financing activities, net	8,803	(8,901)	(3,120)
Net cash provided by financing activities	38,997,899	8,435,077	1,880,824
Net increase in cash and cash equivalents before effect of exchange rate fluctuations	566,646	553,935	257,486
Effect of exchange rate fluctuations on cash held	32,896	51,719	(38,031)
Net increase in cash and cash equivalents	599,542	605,654	219,455
Cash and cash equivalents at January 1	2,635,238	2,029,584	1,810,129
Cash and cash equivalents at December 31	₩ 3,234,780	₩ 2,635,238	₩ 2,029,584

Reporting Entity (Description o

Reporting Entity (Description of the controlling company)	12 Months Ended
	Dec. 31, 2022
Reporting Entity (Description of the controlling company) [Abstract]
Reporting Entity (Description of the controlling company)	1. Reporting Entity (Description of the controlling company) Korea Electric Power Corporation (“KEPCO”) was incorporated on December 31, 1981 in accordance with the Korea Electric Power Corporation engage in the generation, transmission and distribution of electricity and development of electric power resources Naju-si, Jeollanam-do. As of December 31, 2022, KEPCO’s share capital amounts to ￦3,209,820 million and KEPCO’s shareholders are as follows: Number of Percentage of The Government of the Republic of Korea 116,841,794 18.20 % Korea Development Bank (KDB) 211,235,264 32.90 % Foreign investors 88,959,339 13.86 % Other 224,927,680 35.04 % 641,964,077 100.00 % In accordance with the Restructuring Plan enacted on January 21, 1999 by the Ministry of Trade, Industry and Energy, KEPCO spun off its power generation divisions on April 2, 2001, resulting in the establishment of six power generation subsidiaries.

Basis of Preparation

Basis of Preparation	12 Months Ended
	Dec. 31, 2022
Basis of Preparation [Abstract]
Basis of Preparation	2. Basis of Preparation The consolidated financial statements of KEPCO and its subsidiaries (the “Company”) were approved by the Board of Directors of KEPCO on February 24, 2023 and authorized on April 21, 2023 for the purpose of Form 20-F filing with the Securities and Exchange Commission. (1) Statement of compliance These consolidated financial statements have been prepared in accordance with International Financial Reporting Standards (“IFRS”) as issued by the International Accounting Standards Board (“IASB”). (2) Basis of measurement These consolidated financial statements have been prepared on the historical cost basis, except for the following material items in the consolidated statements of financial position: • financial assets at fair value through profit or loss • financial assets at fair value through other comprehensive income • derivative financial instruments are measured at fair value • liabilities for defined benefit plans are recognized at the net of the total present value of defined benefit obligations less the fair value of plan assets (3) Functional and presentation currency These consolidated financial statements are presented in Korean won (presented as “won” or “KRW”), which is also the functional currency of KEPCO and most of the significant operating subsidiaries. (4) Use of estimates and judgments The preparation of the consolidated financial statements in conformity with IFRS requires management to make judgments, estimates and assumptions that affect the application of accounting policies and the reported amounts of assets, liabilities, income and expenses. Actual results may differ from these estimates. Estimates and underlying assumptions are reviewed on an ongoing basis. Revisions to accounting estimates are recognized in the period in which the estimates are revised and in any future periods affected. The followings are the key assumptions and other key sources of estimation uncertainty at the end of the reporting period, that have a significant risk of causing a material adjustment to the carrying amounts of assets and liabilities within the next financial year. (i) Useful lives of property, plant and equipment, and estimations on provision for decommissioning costs The Company reviews the estimated useful lives of property, plant and equipment at the end of each annual reporting period. Management’s assumptions could affect the determination of estimated economic useful lives. The Company records the fair value of estimated decommissioning costs as a liability in the period in which the Company incurs a legal obligation associated with the retirement of long-lived assets that result from acquisition, construction, development and/or normal use of the assets. The Company is required to record a liability for the dismantling (demolition) of nuclear power plants and disposal of spent fuel and low and intermediate radioactive wastes. The measurement of such liability is subject to change based on change in estimated cash flow, inflation rate, discount rate, and expected timing of decommissioning. (ii) Deferred tax The Company recognizes deferred tax assets and liabilities based on the differences between the financial statement carrying amounts and the tax bases of assets and liabilities of each consolidated taxpaying entity. However, the amount of deferred tax assets may be different if the Company determines the estimated future taxable income is not sufficient to realize the deferred tax assets recognized. (iii) Valuations of financial instruments at fair values The Company’s accounting policies and disclosures require the measurement of fair values, for both financial and non-financial If third party information, such as broker quotes or pricing services, is used to measure fair values, then the valuation team assesses the evidence obtained from the third parties to support the conclusion that such valuations meet the requirements of IFRS including the level in the fair value hierarchy in which such valuation techniques should be classified. When measuring the fair value of an asset or a liability, the Company uses market observable data as far as possible. Fair values are categorized into different levels in a fair value hierarchy based on the inputs used in the valuation techniques as follows. If the inputs used to measure the fair value of an asset or a liability might be categorized in different levels of the fair value hierarchy, then the fair value measurement is categorized in its entirety in the same level of the fair value hierarchy as the lowest level input that is significant to the entire measurement. The Company recognizes transfers between levels of the fair value hierarchy at the end of the reporting period during which the change has occurred. (iv) Defined employee benefit liabilities The Company offers its employees defined benefit plans. The cost of providing benefits is determined using the Projected Unit Credit Method, with actuarial valuations being carried out at the end of each reporting period. For actuarial valuations, certain inputs such as discount rates and future salary increases are estimated. Defined benefit plans contain significant uncertainties in estimations due to its long-term nature (refer to Note 25). (v) Unbilled revenue Electricity delivered but neither metered nor billed is estimated at the reporting date based on the volume of electricity delivered which can vary significantly as a result of customer usage patterns, customer mix, meter reading schedules, weather, and etc. Unbilled revenue recognized as of December 31, 2021 and 2022 are ￦2,348,813 million and ￦1,725,444 million, respectively. (vi) Construction contracts The Company recognizes revenue over time using the cost-based input method which represents a faithful depiction of the Company’s progress towards complete satisfaction of providing the power plant construction, which has been identified as a single performance obligation. In applying the cost-based input method, it is necessary to use estimates and assumptions related to the Company’s efforts or inputs expected to be incurred. Costs incurred towards contract completion include costs associated with direct materials, labor, and other indirect costs related to contract performance. Judgment is required in estimating the costs expected to incur in completing the construction projects which involves estimating future materials, labor, contingencies and other related costs. Revenue is estimated based on the contractual amount; however, it can also be affected by uncertainties resulting from unexpected future events. (vii) The 30-year According to the 8th Basic Plan for Electricity Supply and Demand announced by the Ministry of Trade, Industry and Energy in 2017, Wolsong unit 1 nuclear power plant was expected to go through a comprehensive evaluation for the feasibility of continuous operation including economic efficiency and acceptability of household and community in 2018 in order to decide whether to shut down early. On June 15, 2018, the board of directors of Korea Hydro & Nuclear Power Co., Ltd. (“KHNP”), a subsidiary of KEPCO, has decided to shut down Wolsong unit 1 on the grounds that its deficit was increasing and its economic efficiency was low due to the nonoptimal utilization rate. On December 24, 2019, NSSC approved permanent shutdown of unit 1. In addition, the Company has also decided to discontinue the construction of Cheonji unit 1 and 2 and Daejin unit 1 and 2 pursuant to the government policy. Accordingly, the Company recognized impairment loss and other expenses during the year ended December 31, 2018. Among the new nuclear power plants under construction, Shin-Hanul unit 3 and 4, for which approval for power generation business was previously obtained, are not included in the list of construction suspension as determined by the board of directors of KHNP. However, it is highly likely that the construction of Shin-Hanul unit 3 and 4 will be suspended according to the government’s policy. Accordingly, the Company recognized impairment loss during the year ended December 31, 2018, as the Company believed that there was a significant change in its operating environment. However, in accordance with the “New Government Energy Policy Direction”, the management of KHNP, a subsidiary of the Company, reported to its board of directors on the resumption, licensing, and major contracts of suspension services related to Shin-Hanul Shin-Hanul Information about critical judgments in applying accounting policies that have the most significant effect on the amounts recognized in the consolidated financial statements is included in the following notes: ✓ Note 17 – Investments in Associates and Joint Ventures ✓ Note 18 – Property, Plant and Equipment ✓ Note 20 – Construction Contracts ✓ Note 45 – Risk Management Information about assumptions and estimation uncertainties that have a significant risk of resulting in a material adjustment within the next financial year is included in the following notes: ✓ Note 25 – Employment Benefits ✓ Note 41 – Income Taxes (5) Changes in accounting policies (i) Property, Plant and Equipment: Proceeds before Intended Use – Amendments to IA The amendment prohibits entities from deducting from the cost of an item of property, plant and equipment any proceeds from selling items produced while bringing that asset to the location and condition necessary for it to be capable of operating in the manner intended by management. Instead, an entity recognizes the proceeds from selling such items, and the costs of producing those items, in profit or loss. The Company applied the amendment retrospectively to items of property, plant and equipment that are capable of operating on or after the beginning of the earliest period presented in the financial statements in which the entity first applies the amendments, and the impacts on the Company’s consolidated financial statements on the date of initial application (January 1, 2021) are as follows: ① The impacts on the Company’s consolidated statement of financial position as of December 31, 2021 are as follows: Original carrying amount Adjustment New carrying amount In millions of won Current assets ￦ 22,050,845 — 22,050,845 Non-current 189,058,025 14,857 189,072,882 Total Assets 211,108,870 14,857 211,123,727 Current liabilities 31,732,220 — 31,732,220 Non-current 114,064,801 — 114,064,801 Total Liabilities 145,797,021 — 145,797,021 Contributed capital 4,053,578 — 4,053,578 Retained earnings 45,246,982 11,262 45,258,244 Other components of equity 14,468,450 — 14,468,450 Non-controlling 1,542,839 3,595 1,546,434 Total Equity 65,311,849 14,857 65,326,706 Total Liabilities and Equity ￦ 211,108,870 14,857 211,123,727 ② The impacts on the Company’s consolidated statement of comprehensive income Original carrying amount Adjustment New carrying amount In millions of won except per share information Sales ￦ 60,574,819 98,768 60,673,587 Cost of sales (63,559,178 ) (85,112 ) (63,644,290 ) Gross loss (2,984,359 ) 13,656 (2,970,703 ) Selling and administrative expenses (2,875,784 ) (12 ) (2,875,796 ) Operating loss (5,860,143 ) 13,644 (5,846,499 ) Other non-operating 372,921 — 372,921 Other non-operating (257,932 ) — (257,932 ) Other gains, net 8,519 — 8,519 Finance income 1,402,614 — 1,402,614 Finance expenses (3,245,777 ) — (3,245,777 ) Profit related to associates, joint ventures and subsidiaries 494,584 — 494,584 Loss before income tax (7,085,214 ) 13,644 (7,071,570 ) Income tax benefit 1,855,989 — 1,855,989 Net Loss for the period (5,229,225 ) 13,644 (5,215,581 ) Loss attributable to owners of the controlling company (5,315,055 ) 10,533 (5,304,522 ) Profit attributable to non-controlling 85,830 3,111 88,941 Other comprehensive income (loss) 599,614 — 599,614 Total comprehensive income (loss) for the period (4,629,611 ) 13,644 (4,615,967 ) Total comprehensive loss attributable to owners of the controlling company (4,754,046 ) 10,533 (4,743,513 ) Total comprehensive income (attributable to non-controlling 124,435 3,111 127,546 Loss per share (in won) ￦ (8,279 ) 16 (8,263 ) ③ The impacts on the Company’s consolidated statement of cash flows for the year ended December 31, 2021 are as follows: Original carrying amount Adjustment New carrying amount In millions of won Cash flows from operating activities ￦ 4,473,186 18,192 4,491,378 Cash flows from investing activities (12,354,328 ) (18,192 ) (12,372,520 ) Cash flows from financing activities 8,435,077 — 8,435,077 ① The impacts on the Company’s consolidated statement of financial position as of January 1, 2021 are as follows: Original carrying Adjustment New carrying In millions of won Current assets ￦ 20,561,941 — 20,561,941 Non-current assets 182,580,170 1,214 182,581,384 Total Assets 203,142,111 1,214 203,143,325 Current liabilities 25,881,222 — 25,881,222 Non-current liabilities 106,594,043 — 106,594,043 Total Liabilities 132,475,265 — 132,475,265 Contributed capital 4,053,578 — 4,053,578 Retained earnings 51,133,601 730 51,134,331 Other components of equity 14,109,501 — 14,109,501 Non-controlling interests 1,370,166 484 1,370,650 Total Equity 70,666,846 1,214 70,668,060 Total Liabilities and Equity 203,142,111 1,214 203,143,325 ② The impacts on the Company’s consolidated statement of comprehensive income (loss) for the year ended December 31, 2020 are as follows: Original carrying Adjustment New carrying In millions of won except per share information Sales ￦ 57,925,837 797 57,926,634 Cost of sales (51,804,596 ) 417 (51,804,179 ) Gross loss 6,121,241 1,214 6,122,455 Selling and administrative expenses (2,678,443 — (2,678,443 ) Operating loss 3,442,798 1,214 3,444,012 Other non-operating income 1,036,448 — 1,036,448 Other non-operating expense (417,720 — (417,720 ) Other gains, net 35,094 — 35,094 Finance income 1,510,249 — 1,510,249 Finance expenses (2,896,443 — (2,896,443 ) Profit related to associates, joint ventures and subsidiaries 281,107 — 281,107 Loss before income tax 2,991,533 1,214 2,992,747 Income tax benefit (899,064 — (899,064 ) Net Loss for the period 2,092,469 1,214 2,093,683 Loss attributable to owners of the controlling company 1,991,347 730 1,992,077 Profit attributable to non-controlling interests 101,122 484 101,606 Other comprehensive income (loss) (219,841 — (219,841 ) Total comprehensive income (loss) for the period 1,872,628 1,214 1,873,842 Total comprehensive loss attributable to owners of the controlling company 1,802,824 730 1,803,554 Total comprehensive income (attributable to non-controlling interests 69,804 484 70,288 Loss per share (in won) ￦ 3,102 — 3,102 ③ The impacts on the Company’s consolidated statement of cash flows for the year ended December 31, 2020 are as follows: Original carrying amount Adjustment New carrying In millions of won Cash flows from operating activities ￦ 13,208,473 1 13,208,474 Cash flows from investing activities (14,831,811 (1 ) (14,831,812 ) Cash flows from financing activities 1,880,824 — 1,880,824 (ii) Other changes in accounting standards effective from January 1, 2022 are as follows. The Company believes that these amendments have no significant impact on the Company’s consolidated financial statements. The Company has not applied the new and revised standards in issue but not yet effective for the periods starting from January 1, 2022, even though the early adoption of these standards is possible. Onerous Contracts—Costs of Fulfilling a Contract—Amendments to IAS 37 Onerous contract is a contract in which the unavoidable costs of meeting the obligations under the contract exceed the economic benefits expected to be received under it. The amendment specifies that the costs of fulfilling a contract comprise incremental costs, such as the costs of materials or labor, and an allocation of other costs directly related to the contract, such as an allocation of the depreciation charge for an item of property, plant and equipment used in fulfilling the contract, when assessing whether a contract is an onerous contract. The Company will apply the amendment to the contracts for which all obligations have not been fulfilled at the date of initial application. Reference to the Conceptual Framework—Amendments to IFRS 3 The amendments are intended to replace a reference to the Framework for the Preparation and Presentation of Financial Statements, issued in 1989, with a reference to the Conceptual Framework for Financial Reporting issued in March 2018 without significantly changing its requirements. An exception has been added to the recognition principle in IFRS 3 to avoid ‘day 2’ gains or losses arising for liabilities and contingent liabilities that would be within the scope of IAS 37 or IFRIC 21 Levies. It requires an entity to apply criteria in IAS 37 and IFRIC 21 respectively to determine whether a present obligation exists at the acquisition date. The amendment added a new paragraph to IFRS 3 to clarify that the contingent assets should not be recognized at the date of acquisition. IFRS 1 First-time Adoption of International Financial Reporting Standards—Subsidiary as a first-time adopter The amendment permits a subsidiary that elects to apply paragraph D16(a) of IFRS 1 to measure cumulative translation differences using the amounts reported by the parent, based on the parent’s date of transition to IFRS. This amendment is also applied to an associate or joint venture that elects to apply paragraph D16(a) of IFRS 1. IFRS 9 Financial Instruments—Fees in the ‘10 per cent’ test for derecognition of financial liabilities The amendment clarifies the fees that an entity includes when assessing whether the terms of a new or modified financial liability are substantially different from the terms of the original financial liability. These fees include only those paid or received between the borrower and the lender, including fees paid or received by either the borrower or lender on the other’s behalf. There is no restricted and similar amendment to IAS 39. IAS 41 Agriculture—Taxation in fair value measurements The amendments remove the requirement in paragraph 22 of IAS 41 that entities exclude cash flows for taxation when measuring the fair value of assets within the scope of IAS 41.

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2022
Disclosure Of Significant Accounting Policies [Abstract]
Significant Accounting Policies	3. Significant Accounting Policies The accounting policies applied by the Company in these consolidated financial statements are the same as those applied by the Company in its consolidated financial statements as of and for the year ended December 31, 2021, except for the changes described in Note 2.(5). (1) Basis of consolidation The consolidated financial statements are the financial statements of the Company in which the assets, liabilities, equity, income, expenses and cash flows of KEPCO and its subsidiaries are presented as those of a single economic entity. Subsidiaries are those entities controlled by the Company. The Company controls an entity when it is exposed to, or has rights to, variable returns from its involvement with the entity and has the ability to affect those returns through its power over the entity. Income and expense of a subsidiary acquired or disposed of during the year are included in the consolidated statement of comprehensive income (loss) from the effective date of acquisition and up to the effective date of disposal, as appropriate. Total comprehensive income of subsidiaries is attributed to the owners of the Company and to the non-controlling non-controlling When necessary, adjustments are made to the financial statements of subsidiaries to bring their accounting policies in line with those of the Company. All intra-company assets and liabilities, equity, income, expenses and cash flows relating to transactions between entities within the Company are eliminated in full on consolidation. Changes in the Company’s ownership interests in a subsidiary that do not result in the Company losing control over the subsidiary are accounted for as equity transactions. The carrying amounts of the Company’s interests and the non-controlling non-controlling When the Company loses control of a subsidiary, the income or loss on disposal is calculated as the difference between (i) the aggregate of the fair value of the consideration received and the fair value of any retained interest and (ii) the previous carrying amount of the assets (including goodwill), and liabilities of the subsidiary and any non-controlling (2) Business combinations A business combination is accounted for by applying the acquisition method, unless it is a combination involving entities or businesses under common control. The consideration transferred in a business combination is measured at fair value, which is calculated as the sum of the acquisition-date fair values of the assets transferred by the Company, liabilities incurred by the Company to the former owners of the acquiree and the equity interests issued by the Company in exchange for control of the acquiree. Acquisition-related costs are generally recognized in profit or loss as incurred. At the acquisition date, the identifiable assets acquired and the liabilities assumed are recognized at their fair value at the acquisition date, except that: • deferred tax assets or liabilities and liabilities or assets related to employee benefit arrangements are recognized and measured in accordance with IAS 12 ‘Income Taxes’ and IAS 19 ‘Employee Benefits’ respectively; • assets (or disposal groups) that are classified as held for sale in accordance with IFRS 5 ‘Non-current Goodwill is measured as the excess of the sum of the consideration transferred, the amount of any non-controlling non-controlling Non-controlling non-controlling transaction-by-transaction non-controlling When the consideration transferred by the Company in a business combination includes assets or liabilities resulting from a contingent consideration arrangement, the contingent consideration is measured at its acquisition-date fair value and included as part of the consideration transferred in a business combination. Changes in the fair value of the contingent consideration that qualify as measurement period adjustments are adjusted retrospectively, with corresponding adjustments against goodwill. Measurement period adjustments are adjustments that arise from additional information obtained during the ‘measurement period’ (which cannot exceed one year from the acquisition date) about facts and circumstances that existed at the acquisition date. The subsequent accounting for changes in the fair value of the contingent consideration that do not qualify as measurement period adjustments depends on how the contingent consideration is classified. Contingent consideration that is classified as equity is not re-measured re-measured When a business combination is achieved in stages, the Company’s previously held equity interest in the acquiree is re-measured If the initial accounting for a business combination is incomplete by the end of the reporting period in which the combination occurs, the Company reports provisional amounts for the items for which the accounting is incomplete. Those provisional amounts are adjusted during the measurement period (see above), or additional assets or liabilities are recognized, to reflect new information obtained about facts and circumstances that existed at the acquisition date that, if known, would have affected the amounts recognized at that date. The assets and liabilities acquired under business combinations under common control are recognized at the carrying amounts recognized previously in the consolidated financial statements of the ultimate parent. The difference between consideration transferred and carrying amounts of net assets acquired is recognized as part of share premium. (3) Investments in associates An associate is an entity over which the Company has significant influence and that is neither a subsidiary nor an interest in a joint venture. Significant influence is the power to participate in the financial and operating policy decisions of the investee but does not control or joint control over those policies. If the Company holds 20% ~ 50% of the voting power of the investee, it is presumed that the Company has significant influence over the investee. The results and assets and liabilities of associates are incorporated in these consolidated financial statements using the equity method of accounting. If the investment is classified as held for sale, in which case it is accounted for in accordance with IFRS 5 ‘Non-current takes place, the Company shall account for any retained interest in associates in accordance with IFRS 9 ‘Financial Instruments’ unless the retained interest continues to be an associate, in which case the entity uses the equity method. Under the equity method, an investment in an associate is initially recognized in the consolidated statement of financial position at cost and adjusted thereafter to recognize the Company’s share of the profit or loss and other comprehensive income of the associate. When the Company’s share of losses of an associate exceeds the Company’s interest in that associate (which includes any long-term interests that, in substance, form part of the Company’s net investment in the associate), the Company discontinues recognizing its share of further losses. Additional losses are recognized only to the extent that the Company has incurred legal or constructive obligations or made payments on behalf of the associate. Any excess of the cost of acquisition over the Company’s share of the net fair value of the identifiable assets, liabilities and contingent liabilities of an associate recognized at the date of acquisition is recognized as goodwill, which is included within the carrying amount of the investment. Any excess of the Company’s share of the net fair value of the identifiable assets, liabilities and contingent liabilities over the cost of acquisition, after reassessment, is recognized immediately in profit or loss. Upon disposal of an associate that results in the Company losing significant influence over that associate, any retained investment is measured at fair value at that date and the fair value is regarded as its fair value on initial recognition as a financial asset in accordance with IFRS 9. The difference between the previous carrying amount of the associate attributable to the retained interest and its fair value is included in the determination of the gain or loss on disposal of the associate. In addition, the Company accounts for all amounts previously recognized in other comprehensive income in relation to that associate on the same basis as would be required if that associate had directly disposed of the related assets or liabilities. Therefore, if a gain or loss previously recognized in other comprehensive income by that associate would be reclassified to profit or loss on the disposal of the related assets or liabilities, the Company reclassifies the gain or loss from equity to profit or loss (as a reclassification adjustment) when it loses significant influence over that associate. The requirements of IAS 28’ Investments in Associates and Joint Ventures’ are applied to determine whether it is necessary to recognize any impairment loss with respect to the Company’s investment in an associate. When necessary, the entire carrying amount of the investment (including goodwill) is tested for impairment in accordance with IAS 36 ‘Impairment of Assets’ as a single asset by comparing its recoverable amount (higher of value in use and fair value less costs to sell) with its carrying amount, any impairment loss recognized forms part of the carrying amount of the investment. Any reversal of that impairment loss is recognized in accordance with IAS 36 to the extent that the recoverable amount of the investment subsequently increases. When the Company transacts with its associate, incomes and losses resulting from the transactions with the associate are recognized in the Company’s consolidated financial statements only to the extent of interests in the associate that are not related to the Company. (4) Joint arrangements A joint arrangement is an arrangement of which two or more parties have joint control. Joint control is the contractually agreed sharing of control of an arrangement, which exists only when decisions about the relevant activities require the unanimous consent of the parties sharing control. Joint arrangements are classified into two types - joint operations and joint ventures. A joint operation is a joint arrangement whereby the parties that have joint control of the arrangement (i.e., joint operators) have rights to the assets, and obligations for the liabilities, relating to the arrangement. A joint venture is a joint arrangement whereby the parties that have joint control of the arrangement (i.e., joint ventures) have rights to the net assets of the arrangement. The classification of a joint arrangement as a joint operation or a joint venture depends upon the rights and obligations of the parties to the arrangement. The Company determines the type of joint arrangement in which it is involved by considering the structure and form of the arrangement, the terms agreed by the parties in the contractual arrangement and other facts and circumstances. If the joint arrangement is a joint operation, the Company is to recognize and measure the assets and liabilities (and recognize the related revenues and expenses) in relation to its interest in the arrangement in accordance with relevant IFRSs applicable to the particular assets, liabilities, revenues and expenses. If the joint arrangement is a joint venture, the Company is to account for that investment using the equity method accounting in accordance with IAS 28 ‘Investment in Associates and Joint Ventures’ (refer to Note 3.(3)), except when the Company is applicable to the IFRS 5 ‘Non-current for Sale’. (5) Non-current Non-current non-current When the Company is committed to a sale plan involving loss of control of a subsidiary, all of the assets and liabilities of that subsidiary are classified as held for sale when the criteria described above are met, regardless of whether the Company will retain a non-controlling Non-current (6) Goodwill The Company measures goodwill which acquired in a business combination at the amount recognized at the date on which it obtains control of the acquiree (acquisition date) less any accumulated impairment losses. Goodwill acquired in a business combination is allocated to each cash-generating unit (CGU) that is expected to benefit from the synergies arising from the business acquired. The Company assesses at the end of each reporting period and whenever there is an indication that the asset may be impaired. An impairment loss is recognized if the carrying amount of an asset or a CGU exceeds its recoverable amount. Impairment losses are recognized in profit or loss. Any impairment identified at the CGU level will first reduce the carrying value of goodwill and then be used to reduce the carrying amount of the other assets in the CGU on a pro rata basis. Except for impairment losses in respect of goodwill which are never reversed, an impairment loss is reversed if there has been a change in the estimates used to determine the recoverable amount. An impairment loss is reversed only to the extent that the asset’s carrying amount does not exceed the carrying amount that would have been determined, net of depreciation or amortization, if no impairment loss had been recognized. On disposal of the relevant CGU, the amount of goodwill is included in the determination of the gain or loss on disposal. (7) Revenue from Contracts with Customers The Company recognizes revenue by applying the five-step approach (Step 1: Identify the contract(s) with a customer, Step 2: Identify the performance obligations in the contract, Step 3: Determine the transaction price, Step 4: Allocate the transaction price to the performance obligations in the contract, Step 5: Recognize revenue when the entity satisfied a performance obligation). The Company recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services, excluding amounts collected on behalf of third parties. Also, the Company recognizes revenue when the Company satisfies a performance obligation by transferring a promised good or service to a customer. (i) Sale of goods The Company sells electricity to customers and accounts for the generation, transmission and distribution of electricity together as a single performance obligation. The sale of electricity is recognized at a point in time when electricity has been distributed to the customer. The transaction price includes variable consideration due to the progressive electricity billing system, discounts on electricity bills for government policy purposes and penalties. In situations where electricity had been delivered but not yet billed, the Company also estimates the volume of electricity delivered which can vary significantly as a result of customer usage patterns, customer mix, meter reading schedules, weather, etc. Variable consideration is estimated by using the expected value method which predicts the amount of consideration to which the Company will be entitled and is recognized only to the extent that it is highly probable that a significant reversal in the amount of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is subsequently resolved which is when the customer is billed. (ii) Sale of construction services The Company provides power plant construction and EPC services which are each identified as a single performance obligation and is recognized over time on the estimated progress to completion using the cost-based input method. The Company believes using the cost-based input method represents a faithful depiction of the transfer of services to the customer. Cost incurred towards contract completion include costs associated with direct materials, labor, and other indirect costs related to contract performance. Judgment is required in estimating the costs expected to incur in completing the construction projects which involves estimating future materials, labor, contingencies and other related costs. Revenue is estimated based on the contractual amount; however it can also be affected by uncertainties resulting from unexpected future events. Revenue may be recognized in advance of billing the customer which results in the recording of a contract asset. Once the Company meets the billing criteria and its rights to consideration become unconditional, the contract asset is then transferred to trade receivable. Billing requirements are generally structured around the completion of certain construction milestones. On some instances, contract liability is recognized when the Company receives consideration before being able to recognize revenue. Once revenue recognition conditions are met, the contract liability is subsequently released to revenue. (iii) Sale of services The Company develops electric power resources including the provision of power generation byproducts and O&M services which are accounted for as a separate performance obligation under each contract. The Company recognizes revenue over time when customers consume the benefits provided by the Company under the terms of the service agreement. (iv) Adoption of the cost pass-through tariff system The Company amended the basic supply terms and conditions with the approval of the Ministry of Trade, Industry and Energy (MOTIE) on December 17, 2020. The cost pass-through tariff system has been applied to the electricity rate after January 1, 2021 in accordance with the amendment. The Company expects the adoption of the new system would not affect the existing accounting policies including ‘revenue from contracts with customers’. (8) Deferred Revenue The Company receives consideration in the form of an item of property, equipment or cash for constructing or acquiring an item of property or equipment in exchange for supplying electricity to its customers. The transaction price is based on the fair value of the consideration received and is initially recorded in deferred revenue included in current and non-current non-financial (9) Leases The lessee and the lessor account for each lease component separately from non-lease non-lease non-lease (i) The Company as a lessor In the case of finance leases, the Company recognizes the same amount of the net investment in the lease as finance lease receivables and recognizes interest income using the effective interest rate method. Income from operating leases is recognized using the straight-line basis over the lease term, and lease opening direct costs incurred during the negotiation and contract phase of the operating lease contract are added to the carrying amount of the lease asset and recognized as expenses over the lease term on a straight-line basis. (ii) The Company as a lessee (a) Right-of-use The Company recognizes right-of-use Right-of-use re-measurement right-of-use right-of-use Right-of-use (b) Lease liabilities At the commencement date of the lease, the Company recognizes lease liabilities measured at the present value of lease payments to be made over the lease term. The lease payments include fixed payments (including in-substance In calculating the present value of lease payments, the Company uses its incremental borrowing rate at the lease commencement date if the interest rate implicit in the lease is not readily determinable. After the commencement date, the amount of lease liabilities is increased to reflect the accretion of interest and reduced for the lease payments made. In addition, the carrying amount of lease liabilities is remeasured if there is a modification, a change in the lease term, a change in the in-substance (c) Short-term leases and leases of low-value The Company applies the short-term leases recognition exemption to its short-term leases of machinery and equipment (i.e., those leases that have a lease term of 12 months or less from the commencement date and do not contain a purchase option). It also applies the leases of low-value low-value Book value and changes in book value of right-of-use (10) Foreign currencies Transactions in foreign currencies are translated to the respective functional currencies of the Company entities at exchange rates at the dates of the transactions. Monetary items in foreign currencies are retranslated to the functional currency using the reporting date’s exchange rate. Non-monetary Exchange differences are recognized in profit or loss in the period in which they arise except for: • Exchange differences on foreign currency borrowings relating to assets under construction for future productive use, which are included in the cost of those assets when they are regarded as an adjustment to interest costs on those foreign currency borrowings; • Exchange differences on transactions entered into in order to hedge certain foreign currency risks (refer to note 3.(24) • Derivative financial instruments, including hedge accounting); and • Exchange differences on monetary items receivable from or payable to a foreign operation for which settlement is neither planned nor likely to occur (therefore forming part of the net investment in the foreign operation), which are recognized initially in other comprehensive income and reclassified from equity to profit or loss on disposal or partial disposal of the net investment. For the purpose of presenting financial statements, the assets and liabilities of the Company’s foreign operations are expressed in Korean won using exchange rates prevailing at the end of the reporting period. Income and expense items are translated at the average exchange rates for the period, unless exchange rates fluctuated significantly during that period, in which case the exchange rates at the dates of the transactions are used. Exchange differences arising, if any, are recognized in other comprehensive income and accumulated in equity (if applicable, in non-controlling On the disposal of a foreign operation, the cumulative amount of the exchange differences relating to that foreign operation that have been attributed to the controlling interests shall be reclassified from equity to profit or loss (as a reclassification adjustment). The cumulative amount of the exchange differences relating to that foreign operation that have been attributed to the non-controlling On the partial disposal of a subsidiary that includes a foreign operation, the entity shall re-attribute non-controlling Any goodwill arising on the acquisition of a foreign operation and any fair value adjustments to the carrying amounts of assets and liabilities arising on the acquisition of that foreign operation shall be treated as assets and liabilities of the foreign operation. Thus they shall be expressed in the functional currency of the foreign operation and shall be translated at the closing rate. Such exchange differences shall be recognized in equity. (11) Borrowing costs The Company capitalizes borrowing costs directly attributable to the acquisition, construction or production of a qualifying asset as part of the cost of that asset. Other borrowing costs are recognized in expense as incurred. A qualifying asset is an asset that requires a substantial period of time to get ready for its intended use or sale. Investment income earned on the temporary investment of specific borrowings pending their expenditure on qualifying assets is deducted from the borrowing costs eligible for capitalization. All other borrowing costs are recognized in profit or loss in the period in which they are incurred. (12) Government grants Government grants are not recognized unless there is reasonable assurance that the Company will comply with the grant’s conditions and that the grant will be received. Benefit from a government loan at a below-market interest rate is treated as a government grant, measured as the difference between proceeds received and the fair value of the loan based on prevailing market interest rates. (i) If the Company received grants related to assets, government grants whose primary condition is that the Company purchases, constructs or otherwise acquires long-term assets are deducted in calculating the carrying amount of the asset. The grant is recognized in profit or loss over the life of a depreciable asset as a reduced depreciation expense. (ii) If the Company received grants related to expenses, government grants which are intended to compensate the Company for expenses incurred are recognized as other income (government grants) in profit or loss over the periods in which the Company recognizes the related costs as expenses. (13) Employee benefits When an employee has rendered service to the Company during a period, the Company recognizes the contribution payable to a defined contribution plan in exchange for that service as a liability (accrued expense). For defined benefit pension plans and other post-employment benefits, the net periodic pension expense is actuarially determined by “Pension Actuarial System” developed by independent actuaries using the projected unit credit method. The present value of the defined benefit obligation is determined by discounting the estimated future cash outflows using interest rates of high-quality corporate bonds that are denominated in the currency in which the benefits will be paid and that have terms to maturity approximating the terms of the related pension liability. However, if there is not a deep market, market yields on government bonds are used. Net defined benefit liability’s measurement is composed of actuarial gains and losses, return on plan assets excluding net interest on net defined benefit liability, and any change in the effect of the asset ceiling, excluding net interest, which are immediately recognized in other comprehensive income. The actuarial gains or losses recognized in other comprehensive income which will not be reclassified into net profit or loss for later periods are immediately recognized in retained earnings. Past service cost will be recognized as expenses upon the earlier of the date of change or reduction to the plan, or the date of recognizing termination benefits. The retirement benefit obligation recognized in the consolidated statement of financial position represents the present value of the defined benefit obligation as adjusted for unrecognized actuarial gains and losses and unrecognized past service cost, and as reduced by the fair value of plan assets. Any asset resulting from this calculation is limited to unrecognized actuarial losses and past service cost, plus the present value of available refunds and reductions in future contributions to the plan. (14) Income taxes Income tax expense comprises current and deferred tax. Current tax and deferred tax are recognized in profit or loss except to the extent that it relates to a business combination, or items recognized directly in equity or in other comprehensive income. (i) Current tax Current tax is the expected tax payable or receivable on the taxable profit or loss for the year, using tax rates enacted or substantively enacted at the end of the reporting period and any adjustment to tax payable in respect of previous years. The taxable profit is different from the accounting profit for the period since the taxable profit is calculated excluding the temporary differences, which will be taxable or deductible in determining taxable profit (tax loss) of future periods, and non-taxable non-deductible Current tax assets and liabilities are offset only if, the Company (a) has a legally enforceable right to set off the recognized amounts; and (b) intends either to settle on a net basis, or to realize the asset and settle the liability simultaneously. (ii) Deferred tax Deferred tax is recognized, using the asset-liability method, in respect of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for taxation purposes. A deferred tax liability is recognized for all taxable temporary differences. A deferred tax asset is recognized for all deductible temporary differences to the extent that it is probable that taxable profit will be available against which they can be utilized. However, deferred tax is not recognized for the following temporary differences: taxable temporary differences arising on the initial recognition of goodwill, or the initial recognition of assets or liabilities in a transaction that is not a business combination and that affects neither accounting profit or loss nor taxable income. In certain circumstances such as when accounting for leases or decommissioning costs of nuclear power plants, the carrying amount of the asset recorded is equal to the liability recognized at initial recognition. When recording its deferred tax balances, the Company considers these assets and liabilities separately on a gross basis. Accordingly, the taxable temporary difference relating to the asset and the deductible temporary difference relating to the liability are separately recognized and presented on a net basis in the consolidated financial statements. The measurement of deferred tax liabilities and deferred tax assets reflects the tax consequences that would follow from the manner in which the Company expects, at the end of the reporting period, to recover or settle the carrying amount of its assets and liabilities. Deferred tax assets or deferred tax liabilities on investment properties measured at fair value, unless any contrary evidence exists, are measured using the assumption that the carrying amount of the property will be recovered entirely through sale. The Company recognizes a deferred tax liability for all taxable temporary differences associated with investments in subsidiaries, associates, and interests in joint ventures, except to the extent that the Company is able to control the timing of the reversal of the temporary difference and it is probable that the temporary difference will not reverse in the foreseeable future. The Company recognizes a deferred tax asset for all deductible temporary differences arising from investments in subsidiaries and associates, to the extent that it is probable that the temporary difference will reverse in the foreseeable future and taxable profit will be available against which the temporary difference can be utilized. The carrying amount of a deferred tax asset is reviewed at the end of each reporting period and reduces the carrying amount to the extent that it is no longer probable that sufficient taxable profit will be available to allow the benefit of part or all of that deferred tax asset to be utilized. Deferred tax assets and liabilities are measured at the tax rates that are expected to apply to the period when the asset is realized or the liability is settled, based on tax rates (and tax laws) that have been enacted or substantively enacted by the end of the reporting period. The measurement of deferred tax liabilities and deferred tax assets reflects the tax consequences that would follow from the manner in which the Company expects, at the end of the reporting period to recover or settle the carrying amount of its assets and liabilities. Deferred tax assets and liabilities are offset only if there is a legally enforceable right to offset the related current tax liabilities and assets, and they relate to income taxes levied by the same tax authority and they intend to settle current tax liabilities and assets on a net basis. (iii) Current and deferred tax for the year Current and deferred tax are recognized in profit or loss, except when they relate to items that are recognized in other comprehensive income or directly in equity, in which case, the current and deferred tax are also recognized in other comprehensive income or directly in equity respectively. Where current tax or deferred tax arises from the initial accounting for a business combination, the tax effect is included in the accounting for the business combination. (15) Property, plant and equipment Property, plant and equipment are initially measured at cost and after initial recognition, are carried at cost less accumulated depreciation and accumulated impairment losses. The cost of property, plant and equipment includes expenditures arising directly from the construction or acquisition of the asset, any costs directly attributable to bringing the asset to the location and condition necessary for it to be capable of operating in the manner intended by management and the initial estimate of the costs of dismantling and removing the item and restoring the

Segment, Geographic and Other I

Segment, Geographic and Other Information	12 Months Ended
	Dec. 31, 2022
Disclosure of operating segments [abstract]
Segment, Geographic and Other Information	4. Segment, Geographic and Other Information (1) Segment determination and explanation of the measurements The Company’s operating segments are its business components that generate discrete financial information that is reported to and regularly reviewed by chief operating decision makers of the Company including but not limited to the Chief Executive Officer, for the purpose of resource allocation and assessment of segment performance. The Company’s reportable segments are ‘Transmission and distribution’, ‘Electric power generation (Nuclear)’, ‘Electric power generation (Non-nuclear)’, Segment operating profit (loss) is determined the same way that consolidated operating profit is determined under IFRS without any adjustment for corporate allocations. The accounting policies used by each segment are consistent with the accounting policies used in the preparation of the consolidated financial statements. Segment assets and liabilities are determined based on separate financial statements of the entities instead of on a consolidated basis. There are various transactions between the reportable segments, including sales of property, plant and equipment and so on, that are conducted on an arm’s-length (2) Financial information of the segments for the years ended December 31, 2020, 2021 and 2022, respectively, are as follows: 2020 Segment Total segment Intersegment Revenue Depreciation Interest Interest Profit (loss) Employee Loss on Increase in Operating profit (loss) In millions of won Transmission ￦ 57,345,933 1,224,602 56,121,331 3,836,355 48,220 737,973 169,176 190,302 236,727 731,194 3,045,912 Electric power generation (Nuclear) 9,938,941 9,817,147 121,794 3,564,120 25,581 503,485 (4,905 ) 86,672 — 691,052 1,168,833 Electric power generation (Non-nuclear) 20,329,611 19,552,376 777,235 4,034,024 20,843 622,346 115,096 112,775 17,679 346,195 (172,884 ) Plant maintenance & engineering service 2,703,472 2,283,333 420,139 119,056 11,789 1,250 1,740 101,255 — 230,264 197,553 Others 1,582,798 1,096,663 486,135 122,092 167,005 162,843 — 50,889 940 3,711 149,607 Consolidation (33,974,121 ) (33,974,121 ) — (127,628 ) (30,852 ) (32,472 ) — (49,605 ) — (169,651 ) (291,187 ) ￦ 57,926,634 — 57,926,634 11,548,019 242,586 1,995,425 281,107 492,288 255,346 1,832,765 4,097,834 Finance income 1,510,249 Finance expense (2,896,443 ) Gain related to associates, joint ventures and subsidiaries 281,107 Loss before income tax ￦ 2,992,747 2021 Segment Total segment Intersegment Revenue from external Depreciation Interest Interest Profit (loss) Employee Loss on Increase in Operating profit (loss) In millions of won Transmission and distribution ￦ 58,999,388 1,672,776 57,326,612 3,990,464 36,831 678,986 391,116 193,412 202,262 1,194,643 (7,244,319 ) Electric power generation (Nuclear) 9,324,391 9,207,516 116,875 3,611,594 22,209 477,512 (18,146 ) 86,730 — 680,358 762,164 Electric power generation (Non-nuclear) 25,928,596 24,518,167 1,410,429 4,182,470 22,226 624,391 109,765 121,020 5,672 285,152 370,440 Plant maintenance & engineering service 2,805,785 2,370,900 434,885 121,493 9,515 933 11,849 94,269 — 213,500 245,360 Others 2,018,997 1,295,423 723,574 159,222 158,680 162,345 — 52,698 — 2,981 208,139 Consolidation adjustments (39,064,782 ) (39,064,782 ) — (122,751 ) (27,587 ) (29,710 ) — (36,187 ) — 89,818 (64,775 ) ￦ 60,012,375 — 60,012,375 11,942,492 221,874 1,914,457 494,584 511,942 207,934 2,466,452 (5,722,991 ) Finance income 1,402,614 Finance expense (3,245,777 ) Gain related to 494,584 Profit before income tax ￦ (7,071,570 ) 2022 Segment Total segment Intersegment Revenue from external customers Depreciation Interest Interest Profit (loss) ventures and Employee Loss on Increase in Operating profit (loss) In millions of won Transmission and distribution ￦ 68,239,707 1,922,354 66,317,353 4,130,004 67,076 1,420,802 980,146 180,114 157,784 611,534 (33,623,874 ) Electric power generation (Nuclear) 10,386,091 10,254,271 131,820 4,034,774 45,789 557,218 (753 ) 82,466 — 624,221 761,109 Electric power generation (Non-nuclear) 41,944,339 39,252,851 2,691,488 4,091,081 53,242 694,559 329,112 140,067 — 619,947 289,001 Plant maintenance & engineering service 2,975,062 2,516,699 458,363 123,168 14,003 1,405 1,886 82,070 — 213,671 239,529 Others 2,750,231 1,803,231 947,000 211,719 195,966 195,860 — 53,017 3,125 9,463 333,547 Consolidation adjustments (55,749,406 ) (55,749,406 ) — (129,334 ) (35,323 ) (51,298 ) — (52,034 ) — 68,143 (239,843 ) ￦ 70,546,024 — 70,546,024 12,461,412 340,753 2,818,546 1,310,391 485,700 160,909 2,146,979 (32,240,531 ) Finance income 1,833,312 Finance expense (4,746,791 ) Gain related to associates, joint ventures and subsidiaries 1,310,391 Profit before income tax ￦ (33,843,619 ) (3) Information related to segment assets and segment liabilities as of and for the years ended December 31, 2021 and 2022 are as follows: 2021 Segment Segment assets Investments Acquisition of non-current Segment In millions of won Transmission and distribution ￦ 115,578,517 4,700,863 6,754,298 68,531,927 Electric power generation (Nuclear) 64,628,651 141,885 1,959,479 38,361,337 Electric power generation (Non-nuclear) 57,310,164 2,575,019 3,341,960 35,803,289 Plant maintenance & engineering service 3,672,366 53,617 110,330 1,086,926 Others 10,870,812 — 645,760 4,961,880 Segment totals 252,060,510 7,471,384 12,811,827 148,745,359 Consolidation adjustments: Elimination of inter-segment amounts (41,701,400 ) — (12,001 ) (8,101,011 ) Equity method adjustment 1,866,554 — — — Deferred taxes 1,881 — — 5,248,627 Others (1,103,818 ) — — (95,954 ) (40,936,783 ) — (12,001 ) (2,948,338 ) Consolidated totals ￦ 211,123,727 7,471,384 12,799,826 145,797,021 2022 Segment Segment assets Investments Acquisition of non-current Segment In millions of won Transmission and distribution ￦ 131,023,727 5,678,141 6,055,179 108,963,058 Electric power generation (Nuclear) 69,129,625 143,304 2,008,409 42,843,974 Electric power generation (Non-nuclear) 69,468,039 3,113,918 3,547,815 40,428,907 Plant maintenance & engineering service 4,051,157 56,685 200,338 1,272,408 Others 12,895,981 — 839,885 5,796,718 Segment totals 286,568,529 8,992,048 12,651,626 199,305,065 Consolidation adjustments: Elimination of inter-segment amounts (43,801,723 ) — (38,633 ) (9,304,648 ) Equity method adjustment 2,859,623 — — — Deferred taxes (452 ) — — 2,801,832 Others (10,820,983 ) — — 2,489 (51,763,535 ) — (38,633 ) (6,500,327 ) Consolidated totals ￦ 234,804,994 8,992,048 12,612,993 192,804,738 (4) Geographic information Electricity sales, the main operations of the Company, are conducted in the Republic of Korea. The following information on revenue from external customers and non-current Revenue from external customers Non-current (*2) Geographical unit 2020 2021 2022 2020 2021 2022 In millions of won Domestic ￦ 56,775,375 58,771,252 69,142,730 173,673,478 178,760,564 183,707,117 Overseas (*1) 1,151,259 1,241,123 1,403,294 2,831,925 3,572,784 4,724,416 ￦ 57,926,634 60,012,375 70,546,024 176,505,403 182,333,348 188,431,533 (*1) Middle East and other Asian countries make up the majority of overseas revenue and non-current non-current (*2) The amounts exclude financial assets and deferred tax assets. (5) Information on significant customers There is no single customer which accounts for 10% or more of the Company’s revenue for the years ended December 31, 2020, 2021 and 2022.

Classification of Financial Ins

Classification of Financial Instruments	12 Months Ended
	Dec. 31, 2022
Disclosure of detailed information about financial instruments [abstract]
Classification of Financial Instruments	5. Classification of Financial Instruments (1) Classification of financial assets as of December 31, 2021 and 2022 are as follows: 2021 Financial assets at fair value through profit or Financial assets at fair value through other comprehensive income Financial assets at amortized cost Derivative assets (applying hedge accounting) Total In millions of won Current assets Cash and cash equivalents ￦ — — 2,635,238 — 2,635,238 Current financial assets Current financial assets at fair value through profit or loss 360,833 — — — 360,833 Current financial assets at amortized costs — — 15,422 — 15,422 Current derivative assets 93,374 — — 33,564 126,938 Other financial assets — — 1,365,603 — 1,365,603 Trade and other receivables — — 8,122,415 — 8,122,415 454,207 — 12,138,678 33,564 12,626,449 Non-current Non-current Non-current 672,031 — — — 672,031 Non-current — 435,107 — — 435,107 Non-current — — 9,851 — 9,851 Non-current 349,653 — — 171,192 520,845 Other financial assets — — 1,271,976 — 1,271,976 Trade and other receivables — — 1,906,861 — 1,906,861 1,021,684 435,107 3,188,688 171,192 4,816,671 ￦ 1,475,891 435,107 15,327,366 204,756 17,443,120 2022 Financial assets at fair value through profit or loss Financial assets at fair value Financial assets at amortized cost Derivative assets (applying hedge accounting) Total In millions of won Current assets Cash and cash equivalents ￦ — — 3,234,780 — 3,234,780 Current financial assets Current financial assets at fair value through profit or loss 3,181,791 — — — 3,181,791 Current financial assets at amortized costs — — 16,762 — 16,762 Current derivative assets 154,730 — — 134,873 289,603 Other financial assets — — 798,819 — 798,819 Trade and other receivables — — 10,461,822 — 10,461,822 3,336,521 — 14,512,183 134,873 17,983,577 Non-current Non-current Non-current 527,717 — — — 527,717 Non-current — 502,829 — — 502,829 Non-current — — 10,236 — 10,236 Non-current 538,342 — — 190,079 728,421 Other financial assets — — 1,567,632 — 1,567,632 Trade and other receivables — — 2,153,080 — 2,153,080 1,066,059 502,829 3,730,948 190,079 5,489,915 ￦ 4,402,580 502,829 18,243,131 324,952 23,473,492 (2) Classification of financial liabilities as of December 31, 2021 and 2022 are as follows: 2021 Financial liabilities at fair value through profit or loss Financial liabilities recognized at Derivative liabilities (applying hedge Total In millions of won Current liabilities Borrowings ￦ — 4,382,218 — 4,382,218 Debt securities — 9,647,616 — 9,647,616 Derivative liabilities 6,838 — 453 7,291 Trade and other payables — 8,153,426 — 8,153,426 6,838 22,183,260 453 22,190,551 Non-current Borrowings — 2,265,624 — 2,265,624 Debt securities — 64,234,055 — 64,234,055 Derivative liabilities 49,418 — 21,322 70,740 Trade and other payables — 5,996,498 — 5,996,498 49,418 72,496,177 21,322 72,566,917 ￦ 56,256 94,679,437 21,775 94,757,468 2022 Financial liabilities at fair value through profit or loss Financial liabilities Derivative liabilities Total In millions of won Current liabilities Borrowings ￦ — 12,457,853 — 12,457,853 Debt securities — 10,201,149 — 10,201,149 Derivative liabilities 44,994 — — 44,994 Trade and other payables — 11,983,549 — 11,983,549 44,994 34,642,551 — 34,687,545 Non— current liabilities Borrowings — 2,962,323 — 2,962,323 Debt securities — 94,984,040 — 94,984,040 Derivative liabilities 362,252 — 25,505 387,757 Trade and other payables — 5,638,914 — 5,638,914 362,252 103,585,277 25,505 103,973,034 ￦ 407,246 138,227,828 25,505 138,660,579 (3) Classification of comprehensive income (loss) from financial instruments for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Cash and cash equivalents Interest income ￦ 9,419 12,692 51,872 Gain (loss) on foreign currency transactions and translations (15,911 ) 34,923 22,158 Financial assets at fair value through profit or loss Interest income 19,114 18,415 58,540 Dividends income 4,734 2,949 1,994 Gain (loss) on valuation of derivatives (52,447 ) 450,896 336,049 Gain (loss) on transaction of derivatives 36,563 54,352 205,298 Gain (loss) on valuation of financial assets 5,508 8,858 (37,230 ) Gain (loss) on disposal of financial assets 11,344 4,221 9,358 Financial assets at fair value through other comprehensive income Dividends income 2,582 7,573 26,881 Financial assets at amortized cost Interest income 612 797 1,308 Gain (loss) on foreign currency transactions and translations (1,733 ) (3,647 ) 5,087 Loans Interest income 26,232 25,196 33,545 Gain (loss) on foreign currency transactions and translations (527 ) 729 596 Trade and other receivables Interest income 151,035 144,543 164,653 Gain (loss) on disposal of financial assets — 2,452 — Gain (loss) on foreign currency transactions and translations 23,458 14,207 1,019 Short-term financial instruments Interest income 25,540 7,531 15,827 Gain (loss) on foreign currency transactions and translations (38,088 ) 32,218 3,513 Long-term financial instruments Interest income 10,406 12,470 14,371 Gain (loss) on foreign currency transactions and translations — 27 1 Other financial assets Interest income 228 230 637 Derivatives (applying hedge accounting) Gain (loss) on valuation of derivatives (profit or loss) (77,733 ) 211,180 149,888 Gain (loss) on valuation of derivatives (equity, before tax) 9,925 (11,734 ) (93,699 ) Gain (loss) on transaction of derivatives 36,053 31,351 54,422 Financial liabilities at fair value through profit or loss Gain (loss) on valuation of derivatives (104,607 ) 2,751 (345,313 ) Gain (loss) on transaction of derivatives (49,788 ) (15,358 ) (110,236 ) Financial liabilities carried at amortized cost Interest expense of borrowings and debt securities 1,365,801 1,316,269 2,142,220 Gain (loss) on repayment of financial liabilities (35 ) (10 ) (15 ) Interest expense of trade and other payables 88,757 213,765 204,078 Interest expense of others 540,867 384,423 472,248 Other finance income — 1,284 927 Other finance expenses — 2,504 167 Gain (loss) on foreign currency transactions and translations 772,045 (1,162,835 ) (936,269 ) Derivatives (applying hedge accounting) Gain (loss) on valuation of derivatives (profit or loss) (220,928 ) 158,167 83,594 Gain (loss) on valuation of derivatives (equity, before tax) 101,295 (28,726 ) 28,647 Gain (loss) on transaction of derivatives 42,565 13,737 75,201

Restricted Deposits

Restricted Deposits	12 Months Ended
	Dec. 31, 2022
Restricted Deposits [Abstract]
Restricted Deposits	6. Restricted Deposits Restricted deposits as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Cash and cash equivalents Escrow accounts ￦ — 2,912 Deposits for government project and others 22,286 30,586 Collateral provided for borrowings 264,813 250,346 Collateral provided for lawsuit 42 57 Deposits for transmission regional support program 5,921 8,626 Deposits for other business purposes 3,050 3,825 Short-term financial instruments Restriction on withdrawal related to ‘win-win 114,000 101,500 Collateral provided for borrowings 11,745 1,000 Non-current Decommissioning costs of nuclear power plants 531,720 386,220 Long-term financial instruments Escrow accounts 70 1,603 Guarantee deposits for banking accounts at oversea branches 333 18 Collateral provided for borrowings — 21,745 Decommissioning costs of nuclear power plants 324,609 497,609 Funds for developing small and medium enterprises 10,000 — Other non-current assets Deposits for other business purposes — 4,355 ￦ 1,288,589 1,310,402

Cash and Cash Equivalents

Cash and Cash Equivalents	12 Months Ended
	Dec. 31, 2022
Cash and cash equivalents [abstract]
Cash and Cash Equivalents	7. Cash and Cash Equivalents Cash and cash equivalents as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Cash ￦ 19,623 21,113 Other demand deposits 1,825,751 1,906,248 Short-term deposits classified as cash equivalents 407,921 1,063,290 Short-term investments classified as cash equivalents 381,943 244,129 ￦ 2,635,238 3,234,780

Trade and Other Receivables

Trade and Other Receivables	12 Months Ended
	Dec. 31, 2022
Trade and other receivables [abstract]
Trade and Other Receivables	8. Trade and Other Receivables (1) Trade and other receivables as of December 31, 2021 and 2022 are as follows: 2021 Gross Allowance for doubtful accounts Present value discount Book In millions of won Current assets Trade receivables ￦ 7,743,735 (203,838 ) — 7,539,897 Other receivables 602,113 (18,555 ) (1,040 ) 582,518 8,345,848 (222,393 ) (1,040 ) 8,122,415 Non-current Trade receivables 185,512 (1,501 ) — 184,011 Other receivables 1,792,895 (64,155 ) (5,890 ) 1,722,850 1,978,407 (65,656 ) (5,890 ) 1,906,861 ￦ 10,324,255 (288,049 ) (6,930 ) 10,029,276 2022 Gross Allowance for doubtful accounts Present value discount Book In millions of won Current assets Trade receivables ￦ 9,700,880 (196,829 ) — 9,504,051 Other receivables 1,004,528 (44,388 ) (2,369 ) 957,771 10,705,408 (241,217 ) (2,369 ) 10,461,822 Non-current Trade receivables 197,955 (2,171 ) — 195,784 Other receivables 2,033,705 (65,065 ) (11,344 ) 1,957,296 2,231,660 (67,236 ) (11,344 ) 2,153,080 ￦ 12,937,068 (308,453 ) (13,713 ) 12,614,902 (2) Other receivables as of December 31, 2021 and 2022 are as follows: 2021 Gross Allowance for doubtful accounts Present value Book In millions of won Current assets Non-trade receivables ￦ 232,172 (17,084 ) (9 ) 215,079 Accrued income 57,300 — — 57,300 Deposits 212,666 — (1,031 ) 211,635 Finance lease receivables(*1) 60,613 (178 ) — 60,435 Others 39,362 (1,293 ) — 38,069 602,113 (18,555 ) (1,040 ) 582,518 Non-current assets Non-trade receivables 123,537 (56,407 ) (281 ) 66,849 Accrued income 1,828 — — 1,828 Deposits 441,393 — (5,609 ) 435,784 Finance lease receivables(*2) 1,140,080 (590 ) — 1,139,490 Others 86,057 (7,158 ) — 78,899 1,792,895 (64,155 ) (5,890 ) 1,722,850 ￦ 2,395,008 (82,710 ) (6,930 ) 2,305,368 (*1)  Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of ￦111,915 million. (*2)  Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of ￦1,082,712 million.       2022 Gross Allowance for doubtful accounts Present value Book In millions of won Current assets Non-trade receivables ￦ 459,245 (41,293 ) (21 ) 417,931 Accrued income 109,267 — — 109,267 Deposits 289,580 — (2,348 ) 287,232 Finance lease receivables(*1) 67,583 (1,802 ) — 65,781 Others 78,853 (1,293 ) — 77,560 1,004,528 (44,388 ) (2,369 ) 957,771 Non-current assets Non-trade receivables 140,128 (52,696 ) (182 ) 87,250 Accrued income 2,004 — — 2,004 Deposits 459,861 — (11,162 ) 448,699 Finance lease receivables(*2) 1,171,807 (2,703 ) — 1,169,104 Others 259,905 (9,666 ) — 250,239 2,033,705 (65,065 ) (11,344 ) 1,957,296 ￦ 3,038,233 (109,453 ) (13,713 ) 2,915,067 (*1) Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of ￦114,347 million. (*2) Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of ￦1,024,927 million. (3) Trade and other receivables are classified as financial assets at amortized cost and are measured using the effective interest rate method. No interest is accrued for trade receivables related to electricity for the duration between the billing date and the payment due dates. However once trade receivables are overdue, the Company imposes a monthly interest rate of 1.5% on the overdue trade receivables. The Company holds deposits of three months’ expected electricity usage for customers requesting temporary usage and customers with delinquent payments. (4) Aging analysis of trade receivables as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Trade receivables: (not overdue) ￦ 7,603,472 9,509,775 Trade receivables: (impairment reviewed) 325,775 389,060 Less than 60 days 11,577 5,592 60 ~ 90 days 27,201 36,389 90 ~ 120 days 28,230 31,442 120 days ~ 1 year 51,945 99,655 Over 1 year 206,822 215,982 7,929,247 9,898,835 Less: allowance for doubtful accounts (205,339 ) (199,000 ) ￦ 7,723,908 9,699,835 At the end of each reporting period, the Company assesses whether the credit to trade receivables is impaired. The Company recognizes loss allowances for trade receivables individually when there is any objective evidence that trade receivables are impaired and significant and classifies the trade receivables that are not individually assessed as the trade receivables subject to be assessed on a collective basis. Also, the Company recognizes loss allowances based on an ‘expected credit loss’ (ECL) model. (5) Aging analysis of other receivables as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Other receivables: (not overdue) ￦ 2,251,474 2,857,253 Other receivables: (impairment reviewed) 143,534 180,980 Less than 60 days 87 92 60 ~ 90 days 4,881 13,643 90 ~ 120 days 1,248 2,982 120 days ~ 1 year 11,438 18,494 Over 1 year 125,880 145,769 2,395,008 3,038,233 Less: allowance for doubtful accounts (82,710 ) (109,453 ) Less: present value discount (6,930 ) (13,713 ) ￦ 2,305,368 2,915,067 At the end of each reporting period, the Company assesses whether the credit to other receivables is impaired. The Company recognizes loss allowances for other receivables individually when there is any objective evidence that other receivables are impaired and significant, and classifies the other receivables that are not individually assessed as the other receivables subject to be assessed on a collective basis. Also, the Company recognizes loss allowances based on an ‘expected credit loss’ (ECL) model. (6) Changes in the allowance for doubtful accounts for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 Trade Other Trade Other Trade Other In millions of won Beginning balance ￦ 212,759 114,155 208,990 132,379 205,339 82,710 Bad debt expense 24,021 27,329 19,039 18,411 27,078 4,220 Write-off (20,332 ) (1,910 ) (21,809 ) (58,762 ) (26,319 ) (1,103 ) Reversal (3,373 ) (2,464 ) (1,071 ) (79 ) (3,444 ) (37 ) Others (4,085 ) (4,731 ) 190 (9,239 ) (3,654 ) 23,663 Ending balance ￦ 208,990 132,379 205,339 82,710 199,000 109,453

Financial Assets at Fair Value

Financial Assets at Fair Value through Profit or Loss	12 Months Ended
	Dec. 31, 2022
Financial assets at fair value through profit or loss [abstract]
Financial Assets at Fair Value through Profit or Loss	9. Financial Assets at Fair Value through Profit or Loss (1) Financial assets at fair value through profit or loss as of December 31, 2021 and 2022 are as follows: 2021 2022 Current Non-current Current Non-current In millions of won Financial assets at fair value through profit or loss Beneficiary Certificate ￦ 629 206,160 294 121,406 Cooperative — 5,797 — 6,329 Others (*) 360,204 202,003 3,181,497 173,386 360,833 413,960 3,181,791 301,121 Financial assets designated as at fair value through profit or loss Debt with embedded derivatives — 258,071 — 226,596 ￦ 360,833 672,031 3,181,791 527,717 (*) ‘Other’ includes MMT which is composed of government bonds, RP(Repurchase Paper), CP(Commercial Paper), (2) Details of income (loss) from financial assets at fair value through profit or loss for the years ended December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Beneficiary Certificate ￦ 13,632 4,527 Cooperative 110 120 Debt with embedded derivatives 854 946 Others 19,848 27,068 ￦ 34,444 32,661

Financial Assets at Fair Valu_2

Financial Assets at Fair Value through Other Comprehensive Income	12 Months Ended
	Dec. 31, 2022
Financial assets at fair value through other comprehensive income [abstract]
Financial Assets at Fair Value through Other Comprehensive Income	10. Financial Assets at Fair Value through Other Comprehensive Income (1) Changes in financial assets at fair value through other comprehensive income for the years ended December 31, 2021 and 2022 are as follows: 2021 Beginning Acquisition Disposal Valuation Others Ending In millions of won Equity securities Listed ￦ 194,669 1,500 (8,208 ) 81,112 4,753 273,826 Unlisted 163,890 8,929 (13 ) (12,335 ) 319 160,790 358,559 10,429 (8,221 ) 68,777 5,072 434,616 Debt securities Corporate bond — 500 — — (9 ) 491 358,559 10,929 (8,221 ) 68,777 5,063 435,107 Current financial assets at fair value through other comprehensive income ￦ — — — — — — Non-current 358,559 10,929 (8,221 ) 68,777 5,063 435,107 2022 Beginning Acquisition Disposal Valuation Others Ending In millions of won Equity securities Listed ￦ 273,826 — — 28,585 (2,354 ) 300,057 Unlisted 160,790 9,451 — 33,237 (1,235 ) 202,243 434,616 9,451 — 61,822 (3,589 ) 502,300 Debt securities Corporate bond 491 — — 38 — 529 435,107 9,451 — 61,860 (3,589 ) 502,829 Current financial assets at fair value through other comprehensive income ￦ — — — — — — Non-current 435,107 9,451 — 61,860 (3,589 ) 502,829 (2) Financial assets at fair value through other comprehensive income as of December 31, 2021 and 2022 are as follows: 2021 Shares Ownership Acquisition cost Book value Fair value In millions of won Listed Korea District Heating Corp. 2,264,068 19.55 % ￦ 173,201 87,733 87,733 Ssangyong Motor Co., Ltd. 38,568 0.03 % 428 — — SM Korea Line Corp. 180 0.00 % 1 — — Namkwang Engineering & Construction Co., Ltd. 121 0.00 % 15 1 1 Bumyang Construction Co., Ltd. 35 0.00 % 2 — — ELCOMTEC Co., Ltd. 32,875 0.04 % 217 42 42 PAN Ocean Co., Ltd. 1,492 0.00 % 14 8 8 STX Heavy Industries Co., Ltd. 7,419 0.03 % 107 35 35 Codes Combine Co., Ltd. 291 0.00 % 1 1 1 PT Adaro Energy Tbk. 480,000,000 1.50 % 65,028 89,747 89,747 Denison Mines Corp. 58,284,000 9.76 % 84,134 94,376 94,376 Fission Uranium Corp. 100,000 0.02 % 41 73 73 SangSangin Industry Co., Ltd. 5,831 0.01 % 38 6 6 Vitzosys Co., Ltd. 399 0.00 % 2 2 2 EMnI Co., Ltd. 628 0.00 % 25 2 2 Vissem electronics, Co., Ltd. 229 0.00 % 11 2 2 KC Industry Co., Ltd. 139 0.00 % 6 1 1 Ihsung CNI Co., Ltd. 142,860 4.81 % 1,500 1,779 1,779 Aone Alform Co., Ltd. 2,672 0.08 % 19 18 18 324,790 273,826 273,826 Unlisted Intellectual Discovery Co., Ltd. 1,000,000 6.00 % ￦ 5,000 954 954 Hwan Young Steel Co., Ltd. 10,916 0.14 % 1,092 97 97 SAMBO AUTO. Co., Ltd. 15,066 0.02 % 38 38 38 Mobo Co., Ltd. 504 0.00 % 14 14 14 Dae Kwang Semiconductor Co., Ltd. 589 0.07 % 6 6 6 Sanbon Department Store 828 0.01 % 124 3 3 Miju Steel Mfg. Co., Ltd. 1,097 0.23 % 50 50 50 Sungwon Co., Ltd. 117 0.07 % 29 29 29 IMHWA Corp. 329 0.11 % 5 5 5 DALIM Special Vehicle Co., Ltd. 58 0.08 % 10 10 10 ASA JEONJU Co., Ltd. 34,846 1.34 % 697 69 69 Moonkyung Silica Co., Ltd. 42 0.56 % — — — Sungkwang Timber Co., Ltd. 3 0.08 % 5 5 5 HJ Steel Co., Ltd. 218 0.07 % 2 2 2 KS Remicon Co., Ltd. 12 0.04 % 3 3 3 Joongang Platec Co., Ltd. 3,591 0.75 % 72 35 35 Pyungsan SI Co., Ltd. 434 0.01 % 9 9 9 Samgong Development Co., Ltd. 12 0.01 % 7 7 7 Joongang Development Co., Ltd. 540 0.12 % 8 8 8 AJS Co., Ltd. 12,906 0.23 % 32 32 32 MSE Co., Ltd. 429 0.13 % 9 9 9 Ilrim Nano Tec Co., Ltd. 1,520 0.07 % 15 15 15 Youngjin Hi-Tech 11,109 0.25 % 255 150 150 Buyoung Co., Ltd. 270 0.00 % 3 3 3 Ilsuk Co., Ltd. 152 0.17 % 10 10 10 Zyle Daewoo Motor Sales Co., Ltd. 22 0.00 % — — — Daewoo Development Co., Ltd. 8 0.00 % — — — Seyang Inc. 537 0.05 % 27 27 27 2021 Shares Ownership Acquisition cost Book value Fair value In millions of won Seungri Enterprise Co., Ltd. 93 0.05 % ￦ 3 3 3 Shin-E 1,569 0.64 % 111 2 2 Ejung Ad Co., Ltd. 132 0.09 % 3 3 3 Solvus Co., Ltd. 1,056 0.04 % 3 3 3 Myung Co., Ltd. 89 0.05 % 2 2 2 Biwang Industry Co., Ltd 406 0.04 % 2 2 2 Young Sung Co., Ltd. 89 0.40 % 26 26 26 Yuil Industrial Electronics Co., Ltd. 804 0.32 % 15 15 15 Woojin Industry Corporation 3 0.00 % 16 16 16 Kwang Sung Industry Co., Ltd. 325 0.35 % 7 7 7 Futech Mold Co., Ltd. 274 0.27 % 14 14 14 Woojoo Environment Ind. Co., Ltd. 101 0.11 % 13 13 13 Hyungji Esquire Co., Ltd. 61 0.02 % 22 22 22 Morado Co., Ltd. 209 0.04 % 2 2 2 Myung Sung Tex Co., Ltd. 20 0.00 % 2 2 2 Kwang Sung Co., Ltd. 610 0.53 % 31 31 31 Seen Business and Technology co., Ltd. 29,424 0.73 % 148 7 7 Woobang Construction Co., Ltd. 8 0.00 % 8 8 8 Shin Pyung Co., Ltd. 6 0.03 % 3 3 3 JMC Heavy Industries Co., Ltd. 2,724 0.10 % 27 2 2 Najin Steel Co., Ltd. 37 0.06 % 5 5 5 Sinkwang Industry Co., Ltd. 1,091 1.68 % 5 5 5 Elephant & Friends Co., Ltd. 563 0.61 % 3 3 3 Mireco Co., Ltd. 109 0.25 % 11 11 11 L&K Industry Co., Ltd. 1,615 0.60 % 24 24 24 JO Tech Co., Ltd. 1,263 0.62 % 25 25 25 Kendae Printing Co., Ltd. 422 0.60 % 21 21 21 Dauning Co., Ltd. 231 0.41 % 6 6 6 Korea Trecision Co., Ltd. 22 0.45 % 5 5 5 Ace Track Co., Ltd. 3,130 1.08 % 219 59 59 Dung Hwan Co., Ltd. 556 0.02 % 6 6 6 Hurim Biocell Co., Ltd. 1,021 0.00 % 5 5 5 Smart Power Co., Ltd. 133,333 4.14 % 200 200 200 Sunjin Power Tech Co., Ltd. 4,941 0.92 % 247 32 32 Beer Yeast Korea Inc. 1,388 0.43 % 7 7 7 B CON Co., Ltd. 96 1.16 % 6 6 6 Ace Integration Co., Ltd 105 0.09 % 24 24 24 AceInti Agricultural Co., Ltd. 16 0.02 % 5 5 5 KyungDong Co., Ltd. 130 0.01 % 1 1 1 ChunWon Development Co., Ltd. 193 0.19 % 39 39 39 SungLim Industrial Co., Ltd. 29 0.03 % 1 1 1 Korea Minerals Co., Ltd. 191 0.05 % 134 1 1 HyoDong Development Co., Ltd. 128 0.16 % 25 1 1 Haspe Tech Co., Ltd. 652 0.55 % 20 20 20 JoHyun Co., Ltd. 350 1.56 % 18 18 18 KC Co., Ltd. 5,107 0.17 % 26 26 26 SeongJi Industrial Co.,Ltd. 41 0.05 % 1 1 1 Seyang Precision Ind.Co., Ltd. 829 0.23 % 41 41 41 Dooriwon Food System Co., Ltd. 13 0.27 % 1 1 1 ShinShin Co., Ltd 339 1.12 % 17 17 17 2021 Shares Ownership Acquisition cost Book value Fair value In millions of won Sung Kwang Co., Ltd. 23 0.37 % ￦ 6 6 6 Shinheung petrol. Co., Ltd. 699 0.14 % 35 35 35 Force TEC Co., Ltd. 3,501 0.02 % 18 18 18 Samsung Tech Co., Ltd. 486 1.28 % 97 36 36 Younil Metal Co., Ltd. 41 0.21 % 21 21 21 CJ Paradise Co.,Ltd 24 0.02 % 12 12 12 Han Young Technology Company Co.,Ltd. 35 0.00 % — — — K Shipbuilding Co., Ltd. (formerly, STX Offshore & Shipbuilding Co., Ltd.) 8,622 0.25 % 1,078 1,078 1,078 Ptotronics Co., Ltd. 843 0.42 % 84 6 6 NFT Co., Ltd. 136 0.40 % 8 8 8 Hyundaitech Co.,Ltd. 1,363 0.87 % 27 27 27 Dasan Material Co., Ltd. 29 0.04 % 22 22 22 Fish World Co.,Ltd. 47 0.21 % 2 2 2 SG Shinsung Engineering and Construction Co., Ltd. 10 0.00 % 6 — — Samdo Industry Electric Co.,Ltd. 48 0.02 % 1 1 1 Taejung Industries Co.,Ltd. 9,268 0.30 % 5 5 5 Shinsei Trading Co., Ltd. 64 0.72 % 6 6 6 Dynamic Co., Ltd. 111 0.19 % 3 3 3 Green Alchemy Co.,Ltd. 38,202 1.48 % 191 17 17 Youone TBM Engineering & Construction Co., Ltd. 615 0.27 % 31 31 31 KM Leatech Co., Ltd. 1,648 0.98 % 8 8 8 Semist Co.,Ltd. 555 0.80 % 3 3 3 Sewon Bus Co.,Ltd 12 0.00 % — — — Enertec Co., Ltd. 7,937 0.19 % 44 44 44 Sangji Co., Ltd. 20 0.26 % 4 4 4 Bellie Doughnuts Co., Ltd. 169 0.19 % 10 10 10 AIRTECH Information communication Co., Ltd 2,379 0.60 % 12 12 12 Kiscom Co., Ltd. 1,493 0.04 % 1 1 1 Wonil laser Co., Ltd 157 0.37 % 16 16 16 Pyung Hwa Industrial Co.,Ltd. 3,388 3.00 % 85 85 85 Set Holding (*2) 1,100,220 2.50 % 229,255 131,036 131,036 PT. Cirebon Energi Prasarana 22,420 10.00 % 2,612 2,658 2,658 Choheung packing Co.,Ltd. 61 0.13 % 12 12 12 Jaewoo Co., Ltd. 359 0.24 % 11 11 11 Wooyang HC Co., Ltd 1,375 0.01 % 159 13 13 TheYeonriji Co., Ltd. 116 0.10 % 6 6 6 Flusys Co., Ltd. 9 0.08 % 2 2 2 DongSeo Electronics Co., Ltd. 347 0.07 % 16 17 17 Daewoo Display Co., Ltd. 177 0.03 % 5 5 5 NTS Co., Ltd. 143 0.22 % 36 36 36 AID CO., Ltd. 1,212 0.57 % 36 36 36 Changwon Eco-friendly 3 0.01 % — — — Kumo Hitech Co., Ltd. 6,697 0.53 % 100 32 32 Kyung Pyo Industry Co., Ltd. 186 0.76 % 19 19 19 Daedong Industry Co., Ltd. 617 0.55 % 46 46 46 Doosung Heavy Industries Co., Ltd. 53 0.06 % 5 5 5 Samjoo Hightech Co., Ltd. 522 0.08 % 3 3 3 Samkwang Chemical Co., Ltd. 204 1.27 % 51 51 51 SG Corp. 213 0.54 % 21 21 21 2021 Shares Ownership Acquisition cost Book value Fair value In millions of won Shinseung Chemical Industy Co., Ltd. 5 0.01 % ￦ 60 60 60 KJ Alloy Co., Ltd. 368 0.20 % 7 7 7 SM Hi-tech 22 0.39 % 22 22 22 Puruen Environment Co., Ltd. 967 1.34 % 19 19 19 Miretech Co., Ltd. 9,111 0.27 % 18 18 18 Sejin Hightech Co., Ltd. 17,980 0.16 % 18 18 18 Eun Sung Enterprise Co., Ltd. 1,131 0.72 % 17 17 17 Dongdo Basalt Industry Co., Ltd. 182 1.50 % 73 73 73 Shinyoung Textiles Co., Ltd. 523 1.01 % 52 23 23 Ilwoo Steel Co., Ltd. 41 0.28 % 17 17 17 Dong-un 1,159 6.28 % 81 81 81 Wongwang Door Corp. 575 1.00 % 29 29 29 Mansu Co.,Ltd. 344 0.25 % 15 15 15 Eanskorea Co., Ltd. 39 0.05 % 2 2 2 Youngdongseafood Co., Ltd. 165 0.33 % 8 8 8 Hyunwoo Winstar Co., Ltd. 1 0.00 % — — — Sehwa Diecasting Co., Ltd. 299 1.66 % 44 44 44 Sungchang Tech Co., Ltd. 159 0.31 % 10 10 10 Yuchang Industry Co., Ltd. 90 0.11 % 5 5 5 Jeongpum Co., Ltd. 322 0.35 % 16 16 16 Korea Steel Power Co., Ltd. 2,761 1.88 % 55 55 55 Amanex Co., Ltd. 10 0.02 % 9 9 9 Dae-A Leisure Co., Ltd. 23 0.00 % 4 4 4 Caffe Bene Co.,Ltd. 1,908 0.03 % 9 9 9 Shinjin International Corp. 4 0.01 % 1 1 1 Jinhung Packaging Co.,Ltd 4,329 3.02 % 22 22 22 Donglim Eng Co., Ltd. 26 0.11 % 3 3 3 SIP Co., Ltd. 274 0.55 % 7 7 7 Clizen Co., Ltd. 615 0.34 % 31 31 31 DAEDONGMILLENNIUM Co., Ltd. 159 0.42 % 32 32 32 Daeji Product Co., Ltd. 15 0.05 % 1 — — Jaein Circuit Co., Ltd. 498 1.12 % 65 65 65 SSET Co., Ltd. 181 0.30 % 18 18 18 Sewon PM Tech Co., Ltd. 963 1.11 % 48 48 48 Dawon Yuhwa Co., Ltd. 506 1.94 % 25 25 25 Ogokbaekkwa Co., Ltd. 101 0.12 % 1 1 1 Shinwoo Toptech Co., Ltd. 834 0.51 % 83 6 6 KMLC Co., Ltd. 281 0.14 % 22 22 22 Seinfood Co., Ltd. 13 0.17 % 7 7 7 TaeSung Eco-Tech. Co., Ltd. 1,368 4.55 % 34 34 34 Kukex Inc. 639 0.05 % 3 3 3 Youngshin Plus Co., Ltd. 104 0.12 % 5 5 5 Chang won Engineering Co., Ltd. 22 0.00 % 4 4 4 Samsung Silup Co., Ltd. 47 0.19 % 5 5 5 Samwon Bio Tech Co., Ltd. 390 0.25 % 6 6 6 IZU KOREA Co., Ltd. 48 0.00 % 2 2 2 Dongdo CNP Co., Ltd. 234 0.36 % 6 6 6 Dae Bang Industry Co.,Ltd. 115 0.13 % 6 6 6 S.I.T. Co.,Ltd 2,213 0.44 % 22 22 22 Taejin Hiech Co., Ltd. 78 0.26 % 3 3 3 2021 Shares Ownership Acquisition cost Book value Fair value In millions of won Headone Co.,Ltd. 69 0.12 % ￦ 7 7 7 E-Won Solutech Co., Ltd. 158 0.16 % 40 40 40 MJT Co., Ltd. 1,013 0.20 % 51 51 51 KPL Circuit Co., Ltd. 283 0.08 % 14 14 14 Road Solar Co., Ltd. 12 0.00 % — — — Han Mi Flexible Co.,Ltd. 143 0.20 % 43 43 43 Samhwa Casting Co., Ltd. 200 0.04 % 100 100 100 Millennium PNT Co., Ltd. 227 0.37 % 6 6 6 GN Chem Co., Ltd. 40 0.07 % 1 1 1 GW Industry Co., Ltd. 505 0.07 % 51 51 51 TM Construction Co., Ltd. 4 0.00 % — — — Dae Myung Co., Ltd. 114 0.08 % 3 3 3 Nanomicart Co., Ltd. 176 1.06 % 35 35 35 Young San Heavy Industries Co., Ltd. 74 0.11 % 7 7 7 Samchungwon Co., Ltd. 15 0.24 % 2 2 2 Wooyang Frozen Foods Co., Ltd. 66 0.82 % 27 27 27 Nanomic Co., Ltd. 94 0.63 % 38 38 38 Samsung Nonferrous Metal Co., Ltd. 89 0.26 % 9 9 9 Daewha Fuel Pump Ind., Ltd. 83 0.05 % 10 10 10 Addies Direct Co., Ltd. 1 0.00 % — — — WorldCnM Inc. 131 1.09 % 10 10 10 Superone Co., Ltd. 1,585 1.45 % 8 8 8 Buyoung Panji Co., Ltd. 478 0.44 % 12 12 12 International Paint Korea Co., Ltd. 111 0.48 % 11 11 11 EI Lighting Co., Ltd. 358 0.36 % 18 18 18 Hightech Mnp Co., Ltd. 123 0.35 % 6 6 6 Yooseung Co., Ltd. 10 0.08 % 1 1 1 Sungkwang Co., Ltd. 48 0.35 % 2 2 2 Taeyang gasteel Co., Ltd. 8 0.02 % 1 1 1 Ajin KSB Co., Ltd. 204 0.31 % 18 18 18 Sewon Ceramic Co., Ltd. 530 1.01 % 5 5 5 Choyang Tech Co., Ltd. 465 1.01 % 23 23 23 TK Co., Ltd. 307 0.70 % 15 15 15 Arari Co., Ltd. 14 0.05 % 1 1 1 Potech Co., Ltd. 39 0.13 % 14 14 14 C&S Corporation Co., Ltd. 1,304 0.01 % 13 13 13 Global The One of Korea Co., Ltd. 62 0.06 % 3 3 3 Steellife Co., Ltd. 85 0.06 % 4 4 4 D&C Castech Co., Ltd. 330 1.89 % 25 25 25 Geumhan Co., Ltd. 498 0.24 % 7 7 7 Mokgan Co., Ltd. 5 0.02 % 1 1 1 Wenex Co., Ltd. 373 0.53 % 19 19 19 Sulim Co., Ltd. 30 0.20 % 6 6 6 Shinkwang Engineering 24 0.36 % 2 2 2 Ek Cookware Co., Ltd. 60 0.04 % 1 1 1 KTTW Co., Ltd. 28 0.05 % 2 2 2 Avajar Co., Ltd. 1,061 0.01 % 1 1 1 Woosung I.B. Co.,Ltd 7,071 0.07 % 14 14 14 CAP Korea Co., Ltd. 16 0.30 % 3 3 3 MSM Co., Ltd. 25 0.08 % — — — 2021 Shares Ownership Acquisition cost Book value Fair value In millions of won Ddpopstyle Co., Ltd. 22 0.14 % ￦ — — — Finemetal Co., Ltd. 49 0.08 % 1 1 1 Sungkyeong Co., Ltd. 52 0.24 % 2 2 2 RMK Co., Ltd. 63 0.90 % 22 22 22 Tpp Co., Ltd. 36,645 11.72 % 1,832 1,832 1,832 Dukeong Metal Heat Treatment Co., Ltd. 843 3.61 % 84 84 84 Newko Co., Ltd. 331 0.06 % 10 10 10 KMC&R Co., Ltd. 16 0.11 % 1 1 1 Dongsung Mulsan Co., Ltd. 137 0.34 % 14 14 14 Pizzakorea Co., Ltd. 42 0.18 % 9 9 9 Geumdani Co., Ltd. 2,377 1.82 % 36 36 36 Mezzanine I-pack 38 0.02 % 1 1 1 Ltop Co., Ltd. 36 0.06 % 7 7 7 Simile Aluminium Co., Ltd. 428 0.31 % 9 9 9 GT Tooling Co., Ltd. 604 0.17 % 6 6 6 Team Korea Co., Ltd. 4,782 0.37 % 24 24 24 Donghwa TCA Co., Ltd. 1,012 0.30 % 25 25 25 Hankook Piaget Co., Ltd. 4 0.01 % 1 1 1 Coco Food Co., Ltd. 648 1.24 % 33 33 33 Woori Industry Co., Ltd. 102 1.05 % 21 21 21 Ssangyong Youngweol Plant Service&Engineering Co., Ltd. 83 0.07 % 4 1 1 SH Co., Ltd. 39 0.20 % 8 8 8 Namsunnam Co., Ltd. 1,275 0.19 % 6 1 1 Daeyoung Co., Ltd. 75 0.01 % 8 8 8 Chandown Food Co., Ltd. 46 0.14 % 9 9 9 Getron Co., Ltd. 7,259 0.20 % 37 4 4 Jungmun Co., Ltd. 19 0.26 % 2 2 2 Andong Trading Corporation Co., Ltd. 42 0.00 % 2 2 2 JM Tech Co., Ltd. 403 0.67 % 82 10 10 SGC Energy Co., Ltd. 580,000 5.00 % 2,900 2,900 2,900 Le Soleil KHNP LLC 137,600 19.00 % 1,376 1,376 1,376 Ihsung CNI Co., Ltd. 127,660 4.30 % 1,500 2,618 2,618 H Robotics Co., Ltd. 903,601 8.05 % 4,000 5,639 5,639 Good Tcells Co., Ltd. 11,364 0.34 % 500 457 457 IPS Bio Co., Ltd. 1,975 3.13 % 1,000 1,000 1,000 Nine B Co., Ltd. 5,000 4.96 % 1,000 1,000 1,000 Choigang-gujo Co., Ltd. 61 0.45 % 6 1 1 DS Cotec Co., Ltd. 973 0.71 % 15 5 5 Youngheung Industry Co., Ltd. 101 0.05 % 5 1 1 Hosungsteel Co., Ltd. 323 0.26 % 14 3 3 Uktae IND. Co., Ltd. 140 0.12 % 7 1 1 Gangdong R&S Co., Ltd. 69 1.25 % 1 1 1 JFC Co., Ltd. 16 0.01 % 2 2 2 Seokjin E&T Co., Ltd. 81 0.06 % 8 8 8 Hyundai Tech Co., Ltd. 28 0.69 % 10 10 10 Daeil Co., Ltd. 301 0.42 % 15 2 2 Seohan Food Co., Ltd. 83 0.19 % 2 2 2 Daehyeon Recycle Co., Ltd. 59 0.61 % 12 12 12 Metal Link Inc. Co., Ltd. 709 0.17 % 35 4 4 Pipetec Korea Co., Ltd. 50 0.07 % 10 1 1 2021 Shares Ownership Acquisition cost Book value Fair value In millions of won SungJin Tech Co., Ltd. 803 1.20 % ￦ 24 8 8 Yujin E&C Co., Ltd. 29 0.18 % 6 — — Daishin Logistics Co., Ltd. 13 0.09 % 1 1 1 JinSung Engineering Co., Ltd. 18 0.30 % 18 18 18 Yongho Industry Co., Ltd. 157 0.22 % 32 1 1 Wow tech Co., Ltd. 369 0.75 % 11 11 11 World Power Tech Co., Ltd. 16 0.28 % 24 24 24 PBM Auto Co., Ltd. 1,001 1.06 % 10 10 10 K2 Motors Co., Ltd. 54 0.28 % 1 1 1 CL Tech Co., Ltd. 801 2.25 % 40 40 40 Mirae Industry Co., Ltd. 39 0.04 % 6 6 6 Gentak Korea Co., Ltd. 301 0.31 % 8 8 8 Sungjin Chemical Co., Ltd. 118 0.36 % 4 4 4 LMAT Co., Ltd. 198 0.04 % 20 20 20 Poong Lim Industrial Co., Ltd. 25 0.00 % 38 38 38 Dae Sung GeoTech Co., Ltd. 631 1.28 % 32 32 32 Saeheemang Co., Ltd. 756 0.60 % 15 15 15 Hakbong Precision Co., Ltd. 1,460 1.18 % 15 15 15 Vornech Co., Ltd. 431 0.37 % 11 2 2 Woojin Formtech Co., Ltd. 76 0.08 % 8 1 1 Korea Engineer Manufacturing Co., Ltd. 114 0.26 % 6 1 1 Sinwa J&K Co., Ltd. 476 0.28 % 5 5 5 Owon E&G Co., Ltd. 132 0.20 % 4 4 4 Guseong Co., Ltd. 141 0.20 % 4 4 4 Irefarm Co., Ltd. 45 0.30 % 3 3 3 Nam-hae 117 0.10 % 2 2 2 Haenarae Agricultural Corp. 15 0.03 % 2 2 2 Ja Yeon Science Ind. Co., Ltd. 10 0.05 % 2 2 2 DECO&E Co., Ltd. 1,261 0.00 % 2 2 2 Design Beyond Co., Ltd. 17 0.19 % 2 2 2 LBK Co., Ltd. 8 0.05 % 1 1 1 Duckwon industrial Co., Ltd. 32 0.43 % 13 13 13 ASPT Co., Ltd. 64 0.82 % 19 19 19 SIMA Co., Ltd. 29 0.05 % 3 3 3 Jingkang Resources Co., Ltd. 90 1.57 % 13 13 13 Eslin Co., Ltd. 39 0.14 % 8 8 8 Shinwon Co., Ltd. 275 0.42 % 19 19 19 CIC Tech Co., Ltd. 96 0.54 % 10 10 10 Orano Expansion 5,742,405 4.72 % — — — Fourever Co., Ltd. 44 0.10 % 4 4 4 Segyo Hitech Co., Ltd. 156 0.24 % 8 8 8 Myungil Metal Co., Ltd. 80 0.10 % 4 4 4 Daeshin ECM Co., Ltd. 182 0.30 % 9 9 9 Greencarbon Co., Ltd. 79 0.06 % 1 1 1 Sunkoo Co., Ltd. 4 0.10 % 2 2 2 Jians Construction Co., Ltd. 13 0.00 % 2 2 2 DH trading Co., Ltd. 891 0.04 % 178 178 178 Diotech Co., Ltd. 2,186 2.84 % 219 219 219 Sangsin Co., Ltd. 29 0.09 % 15 15 15 Steel focus Co., Ltd. 154 0.20 % 4 4 4 2021 Shares Ownership Acquisition cost Book value Fair value In millions of won Kamada Korea Co., Ltd. 437 0.33 % ￦ 22 22 22 Fosys Co., Ltd. 19 0.08 % 4 4 4 GB precision Co., Ltd. 137 0.57 % 1 1 1 Ewon Art Co., Ltd. 185 0.61 % 9 9 9 DI Tech Co., Ltd. 3 0.00 % — — — Hans AD Co., Ltd. 33 0.35 % 2 2 2 Chaegim Environment Development Co., Ltd. 158 0.01 % 3 3 3 Daesung Stain Co., Ltd. 32 0.32 % 2 2 2 YSM Co., Ltd. 281 2.07 % 14 14 14 Dong In Industry Co., Ltd. 65 0.13 % 3 3 3 U&I Co., Ltd. 50 0.22 % 5 5 5 World One Co., Ltd. 401 0.58 % 10 10 10 Yewon Co., Ltd. 24 0.02 % 1 — — Seeun P&P Co., Ltd. 163 0.48 % 33 33 33 TSNT Co., Ltd. 119 0.00 % 24 24 24 Shinsung Tech Co., Ltd. 314 0.01 % 16 16 16 JSL Co., Ltd. 51 0.49 % 3 3 3 Loft Garden Co., Ltd. 1 0.04 % — — — Handon Co., Ltd. 74 0.25 % 11 11 11 GH Tech Co., Ltd. 82 0.22 % 3 3 3 Daeo Co., Ltd. 13 0.23 % 4 4 4 Bokwang Co., Ltd. 76 0.00 % 15 15 15 Samkum Industry Co., Ltd. 201 0.48 % 40 40 40 Dyntex Korea Co., Ltd. 75 0.28 % 15 15 15 IGSP Co., Ltd. 17,662 0.21 % 18 18 18 Mirae Engineering Co., Ltd. 66 0.15 % 1 1 1 Mideumeul-juneun-namu Co., Ltd. 119 0.53 % 6 6 6 Leagis Co., Ltd. 829 1.38 % 66 66 66 Seil Textile Co., Ltd. 16 0.15 % 3 3 3 Ilshin Tech Co., Ltd. 36 0.00 % 7 7 7 Magtec Co., Ltd. 28 0.00 % 6 6 6 Sukwon Co., Ltd. 2,885 0.59 % 29 29 29 Hae-sung 159 0.17 % 3 3 3 White&Clean Foods Co., Ltd. 330 0.00 % 3 3 3 Michang Cable Co., Ltd. 861 0.13 % 4 4 4 G.M Foods Co., Ltd. 57 0.16 % 9 9 9 Wecan Global Inc. Co., Ltd. 165 0.08 % 8 8 8 Daeju Steel Co., Ltd. 11 0.20 % 1 1 1 Hyundai Glass Co., Ltd. 860 0.83 % 43 43 43 MEC Co., Ltd. 16,468 1.17 % 41 41 41 Daeyeoneco Co., Ltd. 151 0.00 % 15 15 15 Hyesung Cable&Communication Inc. 762 0.39 % 38 38 38 Sangjin Co., Ltd. 428 0.35 % 21 21 21 Topis Co., Ltd. 246 0.71 % 14 14 14 G&L Tech Co., Ltd. 2 0.06 % — — — Cheonhae Co., Ltd. 72 0.00 % 2 2 2 Iksan-guwon Co., Ltd. 563 0.00 % 11 11 11 Korea Remicon Co., Ltd. 36 0.03 % 5 5 5 New Tech Co., Ltd. 23 0.15 % 2 2 2 Segeon Co., Ltd. 124 0.00 % 4 4 4 2021 Shares Ownership Acquisition cost Book value Fair value In millions of won MS Tech Co., Ltd. 9 0.15 % ￦ 1 1 1 J.I Steel Co., Ltd. 21 0.00 % 2 2 2 HNT Co., Ltd. 172 0.00 % 9 9 9 Taejin Co., Ltd. 27 0.08 % 3 3 3 Macroad Co., Ltd. 953 0.17 % 10 10 10 Jinsung Electronics Co., Ltd. 69 1.41 % 14 14 14 Woongjin Energy Co., Ltd. 94 0.00 % 9 9 9 Electric Contractors’ Financial Cooperative Co., Ltd. — — 38 38 38 Information&Communication Financial Cooperative Co., Ltd. — — 15 15 15 Common Computer Co., Ltd. 3,856 1.87 % 1,000 1,000 1,000 Fine Powerex Co., Ltd. 72,633 4.92 % 1,500 1,500 1,500 263,904 160,790 160,790 Debt securities Aron Flying Ship Co., Ltd. (*1) — — 500 491 491 ￦ 589,194 435,107 435,107 (*1) The Company used initial cost as their fair value because there was not enough information to determine fair value, and the range of the estimated fair value is wide. (*2) The Company has estimated the fair value of Set Holding by using the discounted cash flow method and has recognized the difference between its fair value and book value as gain or loss on valuation of financial assets at FVOCI in other comprehensive income or loss during the year ended December 31, 2021. 2022 Shares Ownership Acquisition cost Book value Fair value In millions of won Listed Korea District Heating Corp. 2,264,068 19.55 % ￦ 173,201 64,526 64,526 Ssangyong Motor Co., Ltd. 12,205 0.03 % 428 107 107 SM Korea Line Corp. 180 0.00 % 1 — — Namkwang Engineering & Construction Co., Ltd. 121 0.00 % 15 0 0 Bumyang Construction Co., Ltd. 35 0.00 % 2 — — ELCOMTEC Co., Ltd. 32,875 0.04 % 217 34 34 PAN Ocean Co., Ltd. 1,492 0.00 % 14 9 9 STX Heavy Industries Co., Ltd. 7,419 0.03 % 107 54 54 Codes Combine Co., Ltd. 291 0.00 % 1 1 1 PT Adaro Energy Tbk. 480,000,000 1.50 % 65,028 149,503 149,503 Denison Mines Corp. 58,284,000 7.09 % 84,134 84,502 84,502 Fission Uranium Corp. 100,000 1.73 % 41 75 75 SangSangin Industry Co., Ltd. 5,831 0.01 % 38 3 3 Vitzosys Co., Ltd. 399 0.00 % 2 — — EMnI Co., Ltd. 628 0.00 % 25 3 3 Vissem electronics, Co., Ltd. 229 0.00 % 11 1 1 KC Industry Co., Ltd. 139 0.00 % 6 — — Ihsung CNI Co., Ltd. 142,860 4.81 % 1,500 1,229 1,229 Aone Alform Co., Ltd. 2,672 0.04 % 19 10 10 324,790 300,057 300,057 Unlisted Intellectual Discovery Co., Ltd. 200,000 6.00 % ￦ 5,000 954 954 Hwan Young Steel Co., Ltd. 10,916 0.14 % 1,092 97 97 SAMBO AUTO. Co., Ltd. 15,066 0.02 % 38 38 38 Mobo Co., Ltd. 504 0.00 % 14 14 14 Dae Kwang Semiconductor Co., Ltd. 589 0.07 % 6 6 6 Sanbon Department Store 828 0.01 % 124 3 3 Miju Steel Mfg. Co., Ltd. 1,097 0.23 % 50 50 50 Sungwon Co., Ltd. 117 0.07 % 29 29 29 IMHWA Corp. 329 0.11 % 5 5 5 DALIM Special Vehicle Co., Ltd. 58 0.08 % 10 10 10 Altron Jeonju Co., Ltd. 34,846 1.34 % 697 5 5 Moonkyung Silica Co., Ltd. 42 0.56 % — — — Sungkwang Timber Co., Ltd. 3 0.08 % 5 5 5 KS Remicon Co., Ltd. 12 0.04 % 3 3 3 Joongang Platec Co., Ltd. 3,591 0.75 % 72 35 35 Pyungsan SI Co., Ltd. 434 0.01 % 4 4 4 Samgong Development Co., Ltd. 12 0.01 % 7 7 7 Joongang Development Co., Ltd. 540 0.12 % 8 8 8 AJS Co., Ltd. 12,906 0.23 % 32 32 32 MSE Co., Ltd. 429 0.13 % 9 9 9 Ilrim Nano Tec Co., Ltd. 1,520 0.07 % 15 15 15 Ilsuk Co., Ltd. 152 0.17 % 10 10 10 Zyle Daewoo Motor Sales Co., Ltd. 22 0.00 % — — — Daewoo Development Co., Ltd. 8 0.00 % — — — Seyang Inc. 537 0.05 % 27 30 30 Seungri Enterprise Co., Ltd. 93 0.05 % 3 3 3 Shin-E 1,569 0.64 % 110 2 2 Ejung Ad Co., Ltd. 132 0.09 % 3 3 3 Solvus Co., Ltd. 1,056 0.04 % 3 3 3 Myung Co., Ltd. 89 0.05 % 2 2 2 2022 Shares Ownership Acquisition cost Book value Fair value In millions of won Biwang Industry Co., Ltd 406 0.04 % ￦ 2 2 2 Young Sung Co., Ltd. 89 0.40 % 26 26 26 Yuil Industrial Electronics Co., Ltd. 804 0.32 % 15 15 15 Woojin Industry Corporation 3 0.00 % 16 16 16 Kwang Sung Industry Co., Ltd. 325 0.35 % 7 7 7 Futech Mold Co., Ltd. 274 0.27 % 14 14 14 Woojoo Environment Ind. Co., Ltd. 101 0.11 % 13 13 13 Hyungji Esquire Co., Ltd. 61 0.02 % 22 22 22 Morado Co., Ltd. 209 0.04 % 2 2 2 Myung Sung Tex Co., Ltd. 20 0.00 % 2 2 2 Kwang Sung Co., Ltd. 610 0.53 % 31 31 31 Seen Business and Technology co., Ltd. 29,424 0.73 % 148 7 7 Woobang Construction Co., Ltd. 8 0.00 % 8 8 8 Shin Pyung Co., Ltd. 6 0.03 % 3 3 3 JMC Heavy Industries Co., Ltd. 2,724 0.10 % 27 2 2 Najin Steel Co., Ltd. 37 0.06 % 5 5 5 Sinkwang Industry Co., Ltd. 1,091 1.68 % 5 5 5 Elephant & Friends Co., Ltd. 563 0.61 % 3 3 3 Mireco Co., Ltd. 109 0.25 % 11 11 11 L&K Industry Co., Ltd. 1,615 0.60 % 24 24 24 JO Tech Co., Ltd. 1,263 0.62 % 25 25 25 Kendae Printing Co., Ltd. 422 0.60 % 21 21 21 Dauning Co., Ltd. 231 0.41 % 6 6 6 Korea Trecision Co., Ltd. 22 0.45 % 5 5 5 Hurim Biocell Co., Ltd. 1,021 0.00 % 5 5 5 Smart Power Co., Ltd. 133,333 4.14 % 200 200 200 Sunjin Power Tech Co., Ltd. 4,941 0.92 % 247 32 32 Beer Yeast Korea Inc. 1,388 0.43 % 7 7 7 B CON Co., Ltd. 96 1.16 % 6 6 6 Ace Integration Co., Ltd. 105 0.09 % 24 24 24 AceInti Agricultural Co., Ltd. 16 0.02 % 5 5 5 KyungDong Co., Ltd. 130 0.01 % 1 1 1 ChunWon Development Co., Ltd. 193 0.19 % 39 39 39 SungLim Industrial Co., Ltd. 29 0.03 % 1 1 1 Korea Minerals Co., Ltd. 191 0.05 % 134 1 1 HyoDong Development Co., Ltd. 128 0.16 % 25 1 1 JoHyun Co., Ltd. 350 1.56 % 18 18 18 KC Co., Ltd. 5,107 0.17 % 26 26 26 SeongJi Industrial Co.,Ltd. 41 0.05 % 1 1 1 Seyang Precision Ind. Co., Ltd. 829 0.23 % 41 41 41 Dooriwon Food System Co., Ltd. 13 0.27 % 1 1 1 Sung Kwang Co., Ltd. 23 0.37 % 6 6 6 Shinheung petrol. Co., Ltd. 699 0.14 % 35 35 35 Force TEC Co., Ltd. 3,501 0.02 % 18 18 18 Samsung Tech Co., Ltd. 486 1.28 % 97 36 36 Younil Metal Co., Ltd. 41 0.21 % 21 21 21 CJ Paradise Co.,Ltd 24 0.02 % 12 12 12 Han Young Technology Company Co.,Ltd. 35 0.00 % — — — Ptotronics Co., Ltd. 843 0.42 % 84 6 6 NFT Co., Ltd. 136 0.40 % 8 8 8 Hyundaitech Co.,Ltd. 1,363 0.87 % 27 27 27 Dasan Material Co., Ltd. 29 0.04 % 22 22 22 Fish World Co.,Ltd. 47 0.21 % 2 2 2 2022 Shares Ownership Acquisition cost Book value Fair value In millions of won SG Shinsung Engineering and Construction Co., Ltd. 10 0.00 % ￦ 6 — — Samdo Industry Electric Co.,Ltd. 48 0.02 % 1 1 1 Taejung Industries Co.,Ltd. 9,268 0.30 % 5 5 5 Shinsei Trading Co., Ltd. 64 0.72 % 6 6 6 Dynamic Co., Ltd. 111 0.19 % 3 3 3 Green Alchemy Co.,Ltd. 38,202 1.48 % 191 17 17 Youone TBM Engineering & Construction Co., Ltd. 615 0.27 % 31 31 31 KM Leatech Co., Ltd. 1,648 0.98 % 8 8 8 Semist Co.,Ltd. 555 0.80 % 3 3 3 Sewon Bus Co.,Ltd 12 0.00 % — — — Enertec Co., Ltd. 7,937 0.19 % 44 44 44 Sangji Co., Ltd. 20 0.26 % 4 4 4 Bellie Doughnuts Co., Ltd. 169 0.19 % 10 10 10 AIRTECH Information communication Co., Ltd 2,379 0.60 % 12 12 12 Kiscom Co., Ltd. 1,493 0.04 % 1 1 1 Set Holding (*2) 1,100,220 2.50 % 229,255 163,580 163,580 Choheung packing Co.,Ltd. 61 0.13 % 12 12 12 Jaewoo Co., Ltd. 359 0.24 % 11 11 11 Wooyang HC Co., Ltd 1,375 0.01 % 159 13 13 TheYeonriji Co., Ltd. 116 0.10 % 6 6 6 Flusys Co., Ltd. 9 0.08 % 2 2 2 DongSeo Electronics Co., Ltd. 347 0.07 % 17 17 17 Daewoo Display Co., Ltd. 177 0.03 % 5 5 5 NTS Co., Ltd. 143 0.22 % 36 36 36 AID CO., Ltd. 1,212 0.57 % 36 36 36 Changwon Eco-friendly farming Corp. 3 0.01 % — — — Kumo Hitech Co., Ltd. 6,697 0.53 % 100 32 32 Kyung Pyo Industry Co., Ltd. 186 0.76 % 19 19 19 Doosung Heavy Industries Co., Ltd. 53 0.06 % 5 5 5 Samjoo Hightech Co., Ltd. 522 0.08 % 3 3 3 Samkwang Chemical Co., Ltd. 204 1.27 % 51 51 51 Shinseung Chemical Industy Co., Ltd. 5 0.01 % 60 — — KJ Alloy Co., Ltd. 368 0.20 % 7 7 7 SM Hi-tech Co., Ltd. 22 0.39 % 22 22 22 Puruen Environment Co., Ltd. 967 1.34 % 19 19 19 Miretech Co., Ltd. 9,111 0.27 % 18 18 18 Sejin Hightech Co., Ltd. 17,980 0.16 % 18 18 18 Eun Sung Enterprise Co., Ltd. 1,131 0.72 % 17 17 17 Shinyoung Textiles Co., Ltd. 523 1.01 % 52 23 23 Ilwoo Steel Co., Ltd. 41 0.28 % 17 17 17 Dong-un Tech Co., Ltd. 1,159 6.28 % 81 34 34 Wongwang Door Corp. 575 1.00 % 29 29 29 Mansu Co.,Ltd. 344 0.25 % 15 15 15 Eanskorea Co., Ltd. 39 0.05 % 2 2 2 Youngdongseafood Co., Ltd. 165 0.33 % 8 8 8 Hyunwoo Winstar Co., Ltd. 1 0.00 % — — — Sungchang Tech Co., Ltd. 159 0.31 % 19 19 19 Yuchang Industry Co., Ltd. 90 0.11 % 5 5 5 Jeongpum Co., Ltd. 322 0.35 % 16 16 16 Korea Steel Power Co., Ltd. 2,761 1.88 % 55 2 2 Amanex Co., Ltd. 10 0.02 % 9 9 9 Dae-A Leisure Co., Ltd. 23 0.00 % 4 4 4 Caffe Bene Co.,Ltd. 1,908 0.03 % 9 9 9 Shinjin International Corp. 4 0.01 % 1 1 1 2022 Shares Ownership Acquisition cost Book value Fair value In millions of won Jinhung Packaging Co.,Ltd 4,329 3.02 % ￦ 22 22 22 Donglim Eng Co., Ltd. 26 0.11 % 3 3 3 SIP Co., Ltd. 274 0.55 % 7 7 7 Clizen Co., Ltd. 615 0.34 % 31 31 31 Daeji Product Co., Ltd. 15 0.05 % 1 — — SSET Co., Ltd. 181 0.30 % 18 18 18 Sewon PM Tech Co., Ltd. 963 1.11 % 48 48 48 Dawon Yuhwa Co., Ltd. 506 1.94 % 25 25 25 Ogokbaekkwa Co., Ltd. 101 0.12 % 1 1 1 Shinwoo Toptech Co., Ltd. 834 0.51 % 83 6 6 KMLC Co., Ltd. 281 0.14 % 22 22 22 Seinfood Co., Ltd. 13 0.17 % 7 7 7 TaeSung Eco-Tech. Co., Ltd. 1,368 4.55 % 34 34 34 Kukex Inc. 639 0.05 % 3 3 3 Youngshin Plus Co., Ltd. 104 0.12 % 5 5 5 Chang won Engineering Co., Ltd. 22 0.00 % 4 4 4 Samsung Silup Co., Ltd. 47 0.19 % 5 5 5 Samwon Bio Tech Co., Ltd. 390 0.25 % 6 6 6 IZU KOREA Co., Ltd. 48 0.00 % 2 2 2 Dongdo CNP Co., Ltd. 234 0.36 % 6 6 6 Dae Bang Industry Co.,Ltd. 115 0.13 % 6 6 6 S.I.T. Co.,Ltd 2,213 0.44 % 22 22 22 Taejin Hiech Co., Ltd. 78 0.26 % 3 3 3 Headone Co.,Ltd. 69 0.12 % 7 7 7 E-Won Solutech Co., Ltd. 158 0.16 % 40 40 40 KPL Circuit Co., Ltd. 283 0.08 % 14 14 14 Road Solar Co., Ltd. 12 0.00 % — — — Han Mi Flexible Co.,Ltd. 143 0.20 % 43 43 43 Millennium PNT Co., Ltd. 227 0.37 % 6 6 6 GN Chem Co., Ltd. 40 0.07 % 1 1 1 Dae Myung Co., Ltd. 114 0.08 % 3 3 3 Nanomicart Co., Ltd. 176 1.06 % 35 35 35 Young San Heavy Industries Co., Ltd. 74 0.11 % 7 7 7 Samchungwon Co., Ltd. 15 0.24 % 2 2 2 Wooyang Frozen Foods Co., Ltd. 66 0.82 % 27 27 27 Nanomic Co., Ltd. 94 0.63 % 38 38 38 Samsung Nonferrous Metal Co., Ltd. 89 0.26 % 9 9 9 Daewha Fuel Pump Ind., Ltd. 83 0.05 % 10 10 10 Addies Direct Co., Ltd. 1 0.00 % — — — WorldCnM Inc. 131 1.09 % 10 10 10 Superone Co., Ltd. 1,585 1.45 % 8 8 8 Buyoung Panji Co., Ltd. 478 0.44 % 12 12 12 International Paint Korea Co., Ltd. 111 0.48 % 11 11 11 EI Lighting Co., Ltd. 358 0.36 % 18 18 18 Hightech Mnp Co., Ltd. 123 0.35 % 6 6 6 Yooseung Co., Ltd. 10 0.08 % 1 1 1 Sungkwang Co., Ltd. 48 0.35 % 2 2 2 Taeyang gasteel Co., Ltd. 8 0.02 % 1 1 1 Ajin KSB Co., Ltd. 204 0.31 % 18 18 18 Sewon Ceramic Co., Ltd. 530 1.01 % 5 5 5 Choyang Tech Co., Ltd. 465 1.01 % 23 23 23 TK Co., Ltd. 307 0.70 % 15 15 15 Arari Co., Ltd. 14 0.05 % 1 1 1 2022 Shares Ownership Acquisition cost Book value Fair value In millions of won C&S Corporation Co., Ltd. 1,304 0.01 % ￦ 13 13 13 Global The One of Korea Co., Ltd. 62 0.06 % 3 3 3 Steellife Co., Ltd. 85 0.06 % 4 4 4 D&C Castech Co., Ltd. 330 1.89 % 25 25 25 Geumhan Co., Ltd. 498 0.24 % 7 7 7 Mokgan Co., Ltd. 5 0.02 % 1 1 1 Wenex Co., Ltd. 373 0.53 % 19 19 19 Sulim Co., Ltd. 30 0.20 % 6 6 6 Shinkwang Engineering 24 0.36 % 2 2 2 Ek Cookware Co., Ltd. 60 0.04 % 1 1 1 KTTW Co., Ltd. 28 0.05 % 2 2 2 Avajar Co., Ltd. 1,061 0.01 % 1 1 1 Woosung I.B. Co.,Ltd 7,071 0.07 % 14 14 14 CAP Korea Co., Ltd. 16 0.30 % 3 3 3 MSM Co., Ltd. 25 0.08 % — — — Ddpopstyle Co., Ltd. 22 0.14 % 1 1 1 Finemetal Co., Ltd. 49 0.08 % 1 1 1 Sungkyeong Co., Ltd. 52 0.24 % 2 2 2 RMK Co., Ltd. 63 0.90 % 22 22 22 Newko Co., Ltd. 331 0.06 % 10 10 10 Dongsung Mulsan Co., Ltd. 137 0.34 % 14 14 14 Pizzakorea Co., Ltd. 42 0.18 % 9 9 9 Geumdani Co., Ltd. 2,377 1.82 % 36 36 36 Mezzanine I-pack 38 0.02 % 1 1 1 Ltop Co., Ltd. 36 0.06 % 7 7 7 Simile Aluminium Co., Ltd. 428 0.31 % 9 9 9 GT Tooling Co., Ltd. 604 0.17 % 6 6 6 Team Korea Co., Ltd. 4,782 0.37 % 24 24 24 Donghwa TCA Co., Ltd. 1,012 0.30 % 25 25 25 Hankook Piaget Co., Ltd. 4 0.01 % 1 1 1 Coco Food Co., Ltd. 648 1.24 % 33 33 33 Woori Industry Co., Ltd. 102 1.05 % 21 21 21 Ssangyong Youngweol Plant Service&Engineering Co., Ltd. 83 0.07 % 4 1 1 SH Co., Ltd. 39 0.20 % 8 8 8 Daeyoung Co., Ltd. 75 0.01 % 8 8 8 Chandown Food Co., Ltd. 46 0.14 % 9 9 9 Getron Co., Ltd. 7,259 0.20 % 37 4 4 Jungmun Co., Ltd. 19 0.26 % 2 2 2 Andong Trading Corporation Co., Ltd. 42 0.00 % 2 2 2 JM Tech Co., Ltd. 403 0.67 % 82 10 10 SGC Energy Co., Ltd. 580,000 5.00 % 2,900 7,856 7,856 Le Soleil KHNP LLC 137,600 19.00 % 1,376 1,376 1,376 Ihsung CNI Co., Ltd. 127,660 4.30 % 1,500 2,016 2,016 H Robotics Co., Ltd. 903,601 8.05 % 4,000 5,638 5,638 Good Tcells Co., Ltd. 11,364 0.34 % 500 347 347 IPS Bio Co., Ltd. 1,975 3.13 % 1,000 843 843 Nine B Co., Ltd. 5,000 4.96 % 1,000 1,000 1,000 2022 Shares Ownership Acquisition cost Book value Fair value In millions of won Choigang-gujo Co., Ltd. 61 0.45 % ￦ 6 1 1 Youngheung Industry Co., Ltd. 101 0.05 % 5 1 1 Hosungsteel Co., Ltd. 323 0.26 % 14 3 3 Uktae IND. Co., Ltd. 140 0.12 % 7 1 1 JFC Co., Ltd. 16 0.01 % 2 2 2 Hyundai Tech Co., Ltd. 28 0.69 % 10 10 10 Daeil Co., Ltd. 301 0.42 % 15 2 2 Seohan Food Co., Ltd. 83 0.19 % 2 2 2 Daehyeon Recycle Co., Ltd. 59 0.61 % 12 12 12 Metal Link Inc. Co., Ltd. 709 0.17 % 35 4 4 Pipetec Korea Co., Ltd. 50 0.07 % 10 1 1 SungJin Tech Co., Ltd. 803 1.20 % 24 8 8 Yujin E&C Co., Ltd. 29 0.18 % 6 — — Daishin Logistics Co., Ltd. 13 0.09 % 1 1 1 JinSung Engineering Co., Ltd. 18 0.30 % 18 18 18 Yongho Industry Co., Ltd. 157 0.22 % 32 1 1 Wow tech Co., Ltd. 369 0.75 % 11 11 11 World Power Tech Co., Ltd. 16 0.28 % 24 24 24 PBM Auto Co., Ltd. 1,001 1.06 % 10 10 10 K2 Motors Co., Ltd. 54 0.28 % 1 1 1 CL Tech Co., Ltd. 801 2.25 % 40 40 40 Mirae Industry Co., Ltd. 39 0.04 % 6 6 6 Gentak Korea Co., Ltd. 301 0.31 % 8 8 8 Sungjin Chemical Co., Ltd. 118 0.36 % 4 4 4 LMAT Co., Ltd. 198 0.04 % 20 20 20 Poong Lim Industrial Co., Ltd. 25 0.00 % 38 38 38 Dae Sung GeoTech Co., Ltd. 631 1.28 % 32 32 32 Saeheemang Co., Ltd. 756 0.60 % 15 15 15 Hakbong Precision Co., Ltd. 1,460 1.18 % 15 15 15 Vornech Co., Ltd. 431 0.37 % 11 2 2 Woojin Formtech Co., Ltd. 76 0.08 % 8 1 1 Korea Engineer Manufacturing Co., Ltd. 114 0.26 % 6 1 1 Sinwa J&K Co., Ltd. 476 0.28 % 5 5 5 Owon E&G Co., Ltd. 132 0.20 % 4 4 4 Guseong Co., Ltd. 141 0.20 % 3 3 3 Irefarm Co., Ltd. 45 0.30 % 3 3 3 Nam-hae E&C Co., Ltd. 117 0.10 % 2 2 2 Haenarae Agricultural Corp. 15 0.03 % 2 2 2 DECO&E Co., Ltd. 1,261 0.00 % 2 2 2 Design Beyond Co., Ltd. 17 0.19 % 2 2

Financial Assets at Amortized C

Financial Assets at Amortized Cost	12 Months Ended
	Dec. 31, 2022
Financial Assets at Amortized Cost [Abstract]
Financial Assets at Amortized Cost	11. Financial Assets at Amortized Cost Financial assets at amortized cost as of December 31, 2021 and 2022 are as follows: 2021 Financial assets Book value In millions of won Government bonds ￦ 1,308 1,308 Others 23,965 23,965 ￦ 25,273 25,273 Current ￦ 15,422 15,422 Non-current 9,851 9,851 2022 Financial assets Book value In millions of won Government bonds ￦ 1,920 1,920 Others 25,078 25,078 ￦ 26,998 26,998 Current ￦ 16,762 16,762 Non-current 10,236 10,236

Derivatives

Derivatives	12 Months Ended
	Dec. 31, 2022
Derivatives [Abstract]
Derivatives	12. Derivatives (1) Derivatives as of December 31, 2021 and 2022 are as follows: 2021 2022 Current Non-current Current Non-current In millions of won Derivative assets Currency forward ￦ 559 6,899 648 17,432 Currency swap 125,877 506,957 236,470 589,300 —Trading 92,313 335,765 102,080 410,540 —Hedging 33,564 171,192 134,390 178,760 Interest rate swap 502 6,980 52,485 81,188 —Trading 502 6,980 52,485 81,188 —Hedging — — — — Others (*3) — 9 — 40,501 ￦ 126,938 520,845 289,603 728,421 Derivative liabilities Currency forward ￦ 301 — 32,660 — Currency swap 4,446 16,708 6,319 328,995 —Trading 4,446 15,576 6,319 302,415 —Hedging — 1,132 — 26,580 Interest rate swap 2,544 28,138 — 2,735 —Trading 174 2,829 — 2,735 —Hedging 2,370 25,309 — — Others (*1,2,3) — 25,894 6,015 56,027 ￦ 7,291 70,740 44,994 387,757 (*1) The Company has an obligation to settle the convertible preferred stock to financial investors pursuant to the settlement contract with Samcheok Eco Materials Co., Ltd. and the fair value of the obligation is recorded in ‘Others’(See note 47). (*2) The Company has granted stock option to Chester Solar IV SpA, a joint venture of the Company, and 4 other third party investors, and recognized its fair value as other derivative liabilities. (*3) The Company has an obligation to purchase the shares of Hyundai Green Power Co., Ltd., an associate of the Company from financial investors, and the fair value of the obligation is recorded in ‘Others’. (2) Currency forward contracts which are not designated as hedging instruments as of December 31, 2022 are as follows: Counterparty Contract date Maturity date Contract amounts Contract exchange rate (in won) Pay Receive In millions of won and thousands of foreign currencies Busan Bank 2022.12.08 2023.01.09 ￦ 9,237 USD 7,000 ￦ 1,319.50 Woori Bank 2022.12.09 2023.01.06 13,165 USD 10,000 1,316.45 Nonghyup Bank 2022.12.13 2023.01.10 10,430 USD 8,000 1,303.80 Kookmin Bank 2022.12.15 2023.01.16 12,988 USD 10,000 1,298.84 Hana Bank 2022.12.15 2023.01.17 28,632 USD 22,000 1,301.45 Standard Chartered 2022.12.16 2023.01.18 26,141 USD 20,000 1,307.05 Mizuho Bank 2022.12.16 2023.01.19 26,096 USD 20,000 1,304.80 JP Morgan 2022.12.19 2023.01.20 26,080 USD 20,000 1,304.00 Korea Development Bank 2022.12.19 2023.01.26 26,010 USD 20,000 1,300.50 Kookmin Bank 2022.12.19 2023.01.27 25,959 USD 20,000 1,297.93 Busan Bank 2022.12.21 2023.01.25 12,853 USD 10,000 1,285.25 Nonghyup Bank 2022.12.21 2023.01.26 14,134 USD 11,000 1,284.90 Hana Bank 2022.12.27 2023.01.30 18,992 USD 15,000 1,266.15 Standard Chartered 2022.12.28 2023.01.31 15,216 USD 12,000 1,268.00 Morgan Stanley 2022.12.28 2023.02.01 15,205 USD 12,000 1,267.10 Kookmin Bank 2022.12.29 2023.02.02 20,247 USD 16,000 1,265.44 Mizuho Bank 2022.12.29 2023.02.03 20,255 USD 16,000 1,265.95 Kookmin Bank 2022.12.30 2023.02.28 15,128 USD 12,000 1,260.70 Hana Bank 2022.12.06 2023.01.06 13,091 USD 10,000 1,309.05 Mizuho Bank 2022.12.15 2023.01.13 26,001 USD 20,000 1,300.07 MUFG 2022.12.19 2023.01.20 52,054 USD 40,000 1,301.35 MUFG 2022.12.20 2023.01.13 25,952 USD 20,000 1,297.60 MUFG 2022.12.29 2023.01.27 45,605 USD 36,000 1,266.80 Shinhan Bank 2022.11.03 2023.01.09 7,085 USD 5,000 1,417.00 JP Morgan 2022.11.07 2023.01.13 14,012 USD 10,000 1,401.20 JP Morgan 2022.11.25 2023.01.20 6,611 USD 5,000 1,322.10 JP Morgan 2022.12.29 2023.01.05 38,040 USD 30,000 1,268.00 Standard Chartered 2022.12.29 2023.01.05 25,358 USD 20,000 1,267.90 Mizuho Bank 2022.11.09 2023.01.06 13,681 USD 10,000 1,368.10 Nonghyup Bank 2022.12.27 2023.01.16 6,334 USD 5,000 1,266.70 Mizuho Bank 2022.11.11 2023.01.30 5,207 USD 3,842 1,355.05 Mizuho Bank 2022.11.11 2023.01.30 34,001 USD 25,000 1,360.05 Nonghyup Bank 2022.12.21 2023.02.23 3,603 USD 2,806 1,283.70 SMBC 2022.11.30 2023.01.20 USD 10,000 13,153 1,315.30 SMBC 2022.11.30 2023.02.16 USD 15,000 19,783 1,318.85 SMBC 2022.12.26 2023.03.23 USD 8,000 10,173 1,271.60 SMBC 2022.12.29 2023.03.28 USD 15,000 18,933 1,262.20 SMBC 2022.12.29 2023.06.13 USD 15,000 18,872 1,258.10 MUFG 2022.11.25 2023.02.08 13,175 USD 10,000 1,317.50 MUFG 2022.12.12 2023.02.27 33,947 USD 26,000 1,305.64 MUFG 2022.11.24 2023.01.30 13,234 USD 10,000 1,323.40 JP Morgan 2022.11.24 2023.01.30 13,830 USD 10,406 1,329.05 JP Morgan 2022.11.30 2023.01.17 13,163 USD 10,000 1,316.30 HSBC 2022.11.09 2023.01.30 42,627 USD 31,000 1,375.05 Counterparty Contract date Maturity date Contract amounts Contract exchange rate (in won) Pay Receive In millions of won and thousands of foreign currencies HSBC 2020.10.19 2024.10.29 ￦ 140,913 USD 125,000 ￦ 1,127.30 Busan Bank 2022.10.25 2023.01.13 13,039 USD 9,090 1,434.50 MUFG 2022.10.25 2023.01.13 1,433 USD 1,000 1,433.18 Woori Bank 2022.11.08 2023.02.03 12,332 USD 8,918 1,382.80 Shinhan Bank 2022.11.09 2023.03.03 13,605 USD 10,000 1,360.50 MUFG 2022.11.10 2023.03.03 20,464 USD 15,000 1,364.27 Standard Chartered 2022.11.24 2023.04.07 17,612 USD 13,214 1,332.80 Standard Chartered 2022.12.01 2023.05.12 12,932 USD 10,000 1,293.20 Standard Chartered 2022.12.05 2023.05.12 3,121 USD 2,425 1,286.90 Woori Bank 2022.12.08 2023.05.12 13,145 USD 10,000 1,314.50 HSBC 2022.12.12 2023.06.09 19,482 USD 15,000 1,298.80 Busan Bank 2022.12.12 2023.06.09 19,479 USD 15,000 1,298.60 MUFG 2022.12.15 2023.06.09 19,386 USD 15,000 1,292.41 Shinhan Bank 2022.12.15 2023.06.09 19,397 USD 15,000 1,293.10 Standard Chartered 2022.12.15 2023.06.09 19,397 USD 15,000 1,293.10 HSBC 2022.12.22 2023.06.09 12,695 USD 10,000 1,269.45 Shinhan Bank 2022.12.22 2023.06.09 12,671 USD 10,000 1,267.10 (3) Currency swap contracts which are not designated as hedging instruments as of December 31, 2022 are as follows: Contract year Contract amount Contract interest rate Contract (in won, USD) Counterparty Pay Receive Pay Receive In millions of won and thousands of foreign currencies except contract exchange rate information Standard Chartered 2014~2029 ￦ 102,470 USD 100,000 3.14% 3.57% ￦ 1,024.70 Societe Generale 2014~2024 105,017 USD 100,000 4.92% 5.13% 1,050.17 Hana Bank 2015~2024 107,970 USD 100,000 4.75% 5.13% 1,079.70 Credit Agricole 2015~2024 94,219 USD 86,920 4.85% 5.13% 1,083.97 Woori Bank 2019~2027 21,708 USD 19,417 5.04% 6.75% 1,118.00 Woori Bank 2019~2024 296,000 USD 250,000 1.21% 2.50% 1,184.00 Korea Development Bank 2019~2024 177,600 USD 150,000 1.24% 2.50% 1,184.00 Hana Bank 2019~2024 118,400 USD 100,000 1.24% 2.50% 1,184.00 Woori Bank 2020~2025 241,320 USD 200,000 0.54% 1.13% 1,206.60 Korea Development Bank 2020~2025 241,320 USD 200,000 0.54% 1.13% 1,206.60 Kookmin Bank 2020~2025 120,660 USD 100,000 0.54% 1.13% 1,206.60 Kookmin Bank 2020~2026 76,355 USD 70,445 5.83% 6.00% 1,083.90 Woori Bank 2021~2026 118,170 USD 100,000 1.11% 1.13% 1,181.70 Korea Development Bank 2021~2026 118,170 USD 100,000 1.11% 1.13% 1,181.70 Hana Bank 2021~2026 118,170 USD 100,000 1.11% 1.13% 1,181.70 Hana Bank 2022~2025 385,800 USD 300,000 3.11% 3.63% 1,286.00 Woori Bank 2022~2025 257,200 USD 200,000 3.12% 3.63% 1,286.00 JP Morgan 2022~2027 128,600 USD 100,000 3.56% 4.00% 1,286.00 Woori Bank 2022~2027 128,600 USD 100,000 3.56% 4.00% 1,286.00 Kookmin Bank 2022~2027 128,600 USD 100,000 3.56% 4.00% 1,286.00 Korea Development Bank 2022~2026 283,820 USD 200,000 4.67% 5.38% 1,419.10 Hana Bank 2022~2026 141,910 USD 100,000 4.68% 5.38% 1,419.10 JP Morgan 2022~2026 141,910 USD 100,000 4.69% 5.38% 1,419.10 Woori Bank 2022~2026 141,910 USD 100,000 4.69% 5.38% 1,419.10 Korea Development Bank 2022~2028 283,820 USD 200,000 5.12% 5.50% 1,419.10 Woori Bank 2022~2028 141,910 USD 100,000 5.13% 5.50% 1,419.10 Nomura 2015~2025 111,190 USD 100,000 2.60% 3.25% 1,111.90 Korea Development Bank 2015~2025 111,190 USD 100,000 2.62% 3.25% 1,111.90 Woori Bank 2015~2025 55,595 USD 50,000 2.62% 3.25% 1,111.90 Hana Bank 2015~2025 55,595 USD 50,000 2.62% 3.25% 1,111.90 Woori Bank 2017~2027 111,610 USD 100,000 2.25% 3.13% 1,116.10 Korea Development Bank 2017~2027 111,610 USD 100,000 2.31% 3.13% 1,116.10 Hana Bank 2017~2027 111,610 USD 100,000 2.31% 3.13% 1,116.10 Korea Development Bank 2018~2028 108,600 HKD 800,000 2.69% 3.35% 135.75 Shinhan Bank 2018~2028 115,387 HKD 850,000 2.66% 3.35% 135.75 Korea Development Bank 2018~2023 170,280 USD 150,000 2.15% 3.75% 1,135.20 Woori Bank 2018~2023 170,280 USD 150,000 2.18% 3.75% 1,135.20 Hana Bank 2018~2023 113,520 USD 100,000 2.17% 3.75% 1,135.20 Shinhan Bank 2018~2023 227,040 USD 200,000 2.17% 3.75% 1,135.20 Korea Citi Bank 2019~2024 239,956 CHF 200,000 1.44% 0.00% 1,199.78 Korea Development Bank 2019~2027 119,978 CHF 100,000 1.43% 0.05% 1,199.78 Woori Bank 2021~2026 222,800 USD 200,000 0.93% 1.25% 1,114.00 Shinhan Bank 2021~2026 111,400 USD 100,000 0.92% 1.25% 1,114.00 Korea Development Bank 2021~2026 111,400 USD 100,000 0.93% 1.25% 1,114.00 Nonghyup Bank 2021~2026 111,400 USD 100,000 0.93% 1.25% 1,114.00 Contract year Contract amount Contract interest rate Contract (in won, USD) Counterparty Pay Receive Pay Receive In millions of won and thousands of foreign currencies except contract exchange rate information Woori Bank 2022~2027 ￦ 262,000 USD 200,000 3.62% 4.25% ￦ 1,310.00 Export-Import Bank of Korea 2022~2027 131,000 USD 100,000 3.63% 4.25% 1,310.00 Kookmin Bank 2022~2027 131,000 USD 100,000 3.62% 4.25% 1,310.00 Hana Bank 2022~2027 131,000 USD 100,000 3.61% 4.25% 1,310.00 Korea Development Bank 2022~2027 262,000 USD 200,000 3.63% 4.25% 1,310.00 Export-Import Bank of Korea 2022~2032 349,829 HKD 1,935,000 4.87% 5.16% 180.79 JP Morgan 2022~2032 75,194 HKD 415,000 5.00% 5.16% 181.19 HSBC 2019~2024 USD 205,500 AUD 300,000 3M Libor + 0.78% 3M BBSW + 0.97% USD 0.69 (4) Currency swap contracts which are designated as hedging instruments as of December 31, 2022 are as follows: Counterparty Contract year Contract amount Contract interest rate Contract (in won) Pay Receive Pay Receive In millions of won and thousands of foreign currencies except contract exchange rate information Kookmin Bank 2020~2025 ￦ 118,780 USD 100,000 1.29% 2.13% ￦ 1,187.80 Shinhan Bank 2020~2025 118,780 USD 100,000 1.29% 2.13% 1,187.80 Hana Bank 2020~2025 118,780 USD 100,000 1.29% 2.13% 1,187.80 Korea Development Bank 2020~2026 118,910 USD 100,000 0.61% 1.00% 1,189.10 Hana Bank 2020~2026 118,910 USD 100,000 0.61% 1.00% 1,189.10 Woori Bank 2020~2026 118,910 USD 100,000 0.62% 1.00% 1,189.10 Nomura 2017~2037 52,457 EUR 40,000 2.60% 1.70% 1,311.42 Nomura 2017~2037 59,423 SEK 450,000 2.62% 2.36% 132.05 Kookmin Bank 2021~2026 114,230 USD 100,000 1.27% 1.25% 1,142.30 Korea Development Bank 2021~2026 114,230 USD 100,000 1.27% 1.25% 1,142.30 Hana Bank 2021~2026 114,230 USD 100,000 1.27% 1.25% 1,142.30 Korea Development Bank 2022~2027 123,710 USD 100,000 3.41% 3.63% 1,237.10 Woori Bank 2022~2027 123,710 USD 100,000 3.41% 3.63% 1,237.10 JP Morgan 2022~2027 123,710 USD 100,000 3.41% 3.63% 1,237.10 Korea Development Bank 2018~2023 320,880 USD 300,000 2.03% 3.75% 1,069.60 BNP Paribas 2019~2024 111,841 CHF 100,000 1.78% 0.13% 1,118.41 Kookmin Bank 2019~2024 111,841 CHF 100,000 1.78% 0.13% 1,118.41 Korea Development Bank 2022~2025 128,560 USD 100,000 3.37% 4.13% 1,285.60 Woori Bank 2022~2025 128,560 USD 100,000 3.37% 4.13% 1,285.60 Kookmin Bank 2022~2025 128,560 USD 100,000 3.37% 4.13% 1,285.60 Woori Bank 2021~2026 220,600 USD 200,000 0.47% 0.75% 1,103.00 Shinhan Bank 2021~2026 220,600 USD 200,000 0.47% 0.75% 1,103.00 Hana Bank 2021~2026 55,150 USD 50,000 0.48% 0.75% 1,103.00 Korea Development Bank 2018~2023 169,335 USD 150,000 2.26% 3.88% 1,128.90 Woori Bank 2018~2023 169,335 USD 150,000 2.26% 3.88% 1,128.90 Credit Agricole 2018~2023 112,890 USD 100,000 2.26% 3.88% 1,128.90 Hana Bank 2018~2023 56,445 USD 50,000 2.26% 3.88% 1,128.90 Kookmin Bank 2018~2023 56,445 USD 50,000 2.26% 3.88% 1,128.90 Woori Bank 2020~2025 245,560 USD 200,000 0.93% 1.75% 1,227.80 Hana Bank 2020~2025 245,560 USD 200,000 0.93% 1.75% 1,227.80 Korea Development Bank 2020~2025 122,780 USD 100,000 0.93% 1.75% 1,227.80 JP Morgan 2022~2025 126,180 USD 100,000 2.80% 3.60% 1,261.80 Hana Bank 2022~2025 126,180 USD 100,000 2.80% 3.60% 1,261.80 Korea Development Bank 2022~2025 252,360 USD 200,000 2.83% 3.60% 1,261.80 Woori Bank 2022~2025 126,180 USD 100,000 2.85% 3.60% 1,261.80 (5) Interest rate swap contracts which are not designated as hedging instruments as of December 31, 2022 are as follows: Counterparty Contract Contract amount Contract interest rate per annum Pay Receive In millions of won Nomura (*1) 2018~2038 30,000 2.56% 3.75% Hana Bank 2018~2023 200,000 2.15% 3M CD + 0.19% Hana Bank 2018~2023 200,000 2.17% 3M CD + 0.19% Hana Bank 2018~2023 150,000 2.03% 3M CD + 0.21% Hana Bank 2019~2024 200,000 1.87% 3M CD + 0.13% Shinhan Bank 2021~2025 100,000 2.32% 3M CD + 0.43% Hana Bank 2022~2027 200,000 3.02% 3M CD + 0.61% Hana Bank 2022~2027 200,000 3.04% 3M CD + 0.58% Hana Bank 2022~2027 250,000 3.38% 3M CD + 0.59% Nomura 2022~2027 200,000 3.55% 3M CD + 0.60% Shinhan Bank 2022~2027 150,000 3.53% 3M CD + 0.55% Hana Bank 2022~2027 200,000 3.70% 3M CD + 0.59% Nomura 2022~2027 300,000 3.89% 3M CD + 0.67% Hana Bank 2022~2027 200,000 3.93% 3M CD + 0.67% Nomura 2022~2027 200,000 3.80% 3M CD + 0.68% Nomura 2022~2027 300,000 4.04% 3M CD + 0.60% Hana Bank 2022~2027 100,000 4.68% 3M CD + 1.04% Hana Bank 2022~2027 100,000 5.45% 3M CD + 1.20% Nomura 2017~2032 52,457 3M Libor + 2.22% 2.60% Nomura 2017~2032 59,423 3M Libor + 2.24% 2.62% Nomura (*2) 2021~2041 30,000 1.84% 2.60% Nomura (*3) 2021~2041 50,000 1.87% 2.38% ANZ 2022 - 2025 AUD 540 0.48% 3.33% DBS Bank 2022 - 2025 AUD 540 0.48% 3.33% Societe Generale 2022 - 2025 AUD 540 0.48% 3.28% (*1) 2.56% of the contract paying interest rate is applied for five years from the date of issuance, and 3M CD + 0.10% is applied thereafter. Depending on the counterparty exercising the right, the contract may be early settled on the same date every year from June 15, 2023. (*2) 1.84% of the contract paying interest rate is applied for five years from the date of issuance, and 3M CMT + 0.35% is applied thereafter. (*3) 1.87% of the contract paying interest rate is applied for five years from the date of issuance, and 3M CMT + 0.35% is applied thereafter. (6) Interest rate swap contracts which are designated as hedging instruments as of December 31, 2022 are as follows: Counterparty Contract Contract amount Contract interest rate per annum Pay Receive In thousands of USD Export-Import Bank of Korea 2015~2031 USD 15,893 2.67% 6M USD Libor ING Bank 2015~2031 USD 7,861 2.67% 6M USD Libor BNP Paribas 2015~2031 USD 7,861 2.67% 6M USD Libor BNP Paribas 2009~2027 USD 51,891 4.16% 6M USD Libor KFW 2009~2027 USD 51,891 4.16% 6M USD Libor Export-Import Bank of Korea 2016~2036 USD 66,124 3.00% 6M USD Libor (7) Gain and loss on valuation and transaction of derivatives for the years ended December 31, 2020, 2021 and 2022 are as follows and included in finance income and expenses in the consolidated statements of comprehensive income (loss): Net income effects of Net income effects of Other comprehensive 2020 2021 2022 2020 2021 2022 2020 2021 2022 In millions of won Currency forward ￦ (40,590 ) 33,066 (20,570 ) (17,911 ) 33,032 (2,710 ) — — — Currency swap (406,607 ) 787,264 155,937 93,557 61,353 234,195 105,642 (59,108 ) (102,969 ) - Trading (108,090 ) 420,551 (77,618 ) 16,661 16,265 104,572 — — — - Hedging (298,517 ) 366,713 233,555 76,896 45,088 129,623 105,642 (59,108 ) (102,969 ) Interest rate swap (1,845 ) 18,123 66,341 (10,253 ) (10,303 ) (6,800 ) 5,578 18,648 37,917 - Trading (309 ) 18,123 66,341 (11,975 ) (10,303 ) (6,800 ) — — — - Hedging (1,536 ) — — 1,722 — — 5,578 18,648 37,917 Other derivatives (6,673 ) (15,459 ) 22,510 — — — — — — ￦ (455,715) 822,994 224,218 65,393 84,082 224,685 111,220 (40,460) (65,052) (*) For the year ended December 31, 2022, the net loss on valuation of derivatives applying cash flow hedge accounting of ￦24,415 million, net of tax, is included in other comprehensive income (loss).

Other Financial Assets

Other Financial Assets	12 Months Ended
	Dec. 31, 2022
Other Financial Assets [Abstract]
Other Financial Assets	13. Other Financial Assets (1) Other financial assets as of December 31, 2021 and 2022 are as follows: 2021 2022 Current Non-current Current Non-current In millions of won Loans ￦ 88,406 903,397 132,890 968,468 Less: Allowance for doubtful accounts (10 ) (52,667 ) (13 ) (54,824 ) Less: Present value discount (807 ) (29,248 ) (816 ) (32,334 ) 87,589 821,482 132,061 881,310 Long-term / short-term financial instruments 1,278,014 450,494 666,758 686,322 ￦ 1,365,603 1,271,976 798,819 1,567,632 (2) Loans as of December 31, 2021 and 2022 are as follows: 2021 Face value Allowance for Present value Carrying value In millions of won Short-term loans Loans for tuition ￦ 28,975 — (807 ) 28,168 Loans for housing 25,750 — — 25,750 Other loans 33,681 (10 ) — 33,671 88,406 (10 ) (807 ) 87,589 Long-term loans Loans for tuition 431,002 (37,783 ) (29,248 ) 363,971 Loans for housing 282,833 — — 282,833 Loans for related parties 150,541 (14,861 ) — 135,680 Fisheries loan 203 — — 203 Other loans 38,818 (23 ) — 38,795 903,397 (52,667 ) (29,248 ) 821,482 ￦ 991,803 (52,677 ) (30,055 ) 909,071 2022 Face value Allowance for Present value Carrying value In millions of won Short-term loans Loans for tuition ￦ 30,261 — (816 ) 29,445 Loans for housing 29,630 — — 29,630 Other loans 72,999 (13 ) — 72,986 132,890 (13 ) (816 ) 132,061 Long-term loans Loans for tuition 436,131 (37,783 ) (32,334 ) 366,014 Loans for housing 309,446 — — 309,446 Loans for related parties 187,728 (17,041 ) — 170,687 Other loans 35,163 — — 35,163 968,468 (54,824 ) (32,334 ) 881,310 ￦ 1,101,358 (54,837 ) (33,150 ) 1,013,371 (3) Changes in the allowance for doubtful accounts of loans for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Beginning balance ￦ 15,094 20,267 52,677 Bad debt expense 5,173 30,942 2,180 Other — 1,468 (20 ) Ending balance ￦ 20,267 52,677 54,837 (4) Long-term and short-term financial instruments as of December 31, 2021 and 2022 are as follows: 2021 2022 Current Non-current Current Non-current In millions of won Time deposits ￦ 976,899 103,607 428,813 130,570 CD — — 30,000 — Others 301,115 346,887 207,945 555,752 ￦ 1,278,014 450,494 666,758 686,322

Inventories

Inventories	12 Months Ended
	Dec. 31, 2022
Classes of current inventories [abstract]
Inventories	14. Inventories Inventories as of December 31, 2021 and 2022 are as follows: 2021 Acquisition cost Valuation allowance Book In millions of won Raw materials ￦ 3,655,588 (1,247 ) 3,654,341 Merchandises 512 — 512 Work-in-progress 180,220 — 180,220 Finished goods 27,254 — 27,254 Supplies 2,541,028 (3,869 ) 2,537,159 Inventories-in-transit 1,195,148 — 1,195,148 Other inventories 13,548 — 13,548 ￦ 7,613,298 (5,116 ) 7,608,182 2022 Acquisition cost Valuation allowance Book In millions of won Raw materials ￦ 4,522,171 (1,350 ) 4,520,821 Merchandises 1,001 — 1,001 Work-in-progress 172,089 (75 ) 172,014 Finished goods 52,642 (57 ) 52,585 Supplies 2,814,377 — 2,814,377 Inventories-in-transit 2,356,444 — 2,356,444 Other inventories 13,490 — 13,490 ￦ 9,932,214 (1,482 ) 9,930,732 The reversal of the allowance for loss on inventory valuation deducted from the cost of sales for the years ended December 31, 2020, ￦ 2,020 million, The amounts of loss from inventory valuation included in other gains or losses for the years ended December 31, 2020, ￦ 4,998 million,

Non-Financial Assets

Non-Financial Assets	12 Months Ended
	Dec. 31, 2022
Disclosure Of Other Assets [Abstract]
Non-Financial Assets	15. Non-Financial Non-financial 2021 2022 Current Non-current Current Non-current In millions of won Advanced payments ￦ 161,466 124,305 160,596 51,425 Prepaid expenses 756,729 151,095 366,532 153,830 Others (*) 840,796 89,418 1,217,741 103,879 ￦ 1,758,991 364,818 1,744,869 309,134 (*) Details of others as of December 31, 2021 and 2022 are as follows: 2021 2022 Current Non-current Current Non-current In millions of won Greenhouse gas emissions rights ￦ 524,658 — 192,005 — Other quick assets 316,138 89,418 1,025,736 103,879 ￦ 840,796 89,418 1,217,741 103,879

Consolidated Subsidiaries

Consolidated Subsidiaries	12 Months Ended
	Dec. 31, 2022
Disclosure of subsidiaries [abstract]
Consolidated Subsidiaries	16. Consolidated Subsidiaries (1) Consolidated subsidiaries as of December 31, 2021 and 2022 are as follows: Percentage of ownership (%) Subsidiaries Key operation activities Location 2021 2022 Korea Hydro & Nuclear Power Co., Ltd. Power generation Korea 100.00 % 100.00 % Korea South-East Power Co., Ltd. Power generation Korea 100.00 % 100.00 % Korea Midland Power Co., Ltd. Power generation Korea 100.00 % 100.00 % Korea Western Power Co., Ltd. Power generation Korea 100.00 % 100.00 % Korea Southern Power Co., Ltd. Power generation Korea 100.00 % 100.00 % Korea East-West Power Co., Ltd. Power generation Korea 100.00 % 100.00 % KEPCO Engineering & Construction Company, Inc.(*1) Engineering and construction for utility plant and others Korea 65.77 % 65.77 % KEPCO Plant Service & Engineering Co., Ltd. Utility plant maintenance and others Korea 51.00 % 51.00 % KEPCO Nuclear Fuel Co., Ltd. Nuclear fuel Korea 96.36 % 96.36 % KEPCO KDN Co., Ltd. Electric power information technology and others Korea 100.00 % 100.00 % KEPCO International HongKong Ltd. Holding company Hong Kong 100.00 % 100.00 % KEPCO International Philippines Inc. Holding company Philippines 100.00 % 100.00 % KEPCO Gansu International Ltd. Holding company Hong Kong 100.00 % 100.00 % KEPCO Philippines Holdings Inc.(*11) Holding company Philippines 100.00 % 100.00 % KEPCO Philippines Corporation Operation of utility plant Philippines 100.00 % 100.00 % KEPCO Ilijan Corporation Construction and operation of utility plant Philippines 51.00 % 51.00 % KEPCO Lebanon SARL Operation of utility plant Lebanon 100.00 % 100.00 % KEPCO Neimenggu International Ltd. Holding company Hong Kong 100.00 % 100.00 % KEPCO Shanxi International Ltd. Holding company Hong Kong 100.00 % 100.00 % KOMIPO Global Pte Ltd. Holding company Singapore 100.00 % 100.00 % KEPCO Netherlands B.V. Holding company Netherlands 100.00 % 100.00 % KEPCO Australia Pty., Ltd. Resources development Australia 100.00 % 100.00 % KOSEP Australia Pty., Ltd. Resources development Australia 100.00 % 100.00 % KOMIPO Australia Pty., Ltd. Resources development Australia 100.00 % 100.00 % KOWEPO Australia Pty., Ltd. Resources development Australia 100.00 % 100.00 % KOSPO Australia Pty., Ltd. Resources development Australia 100.00 % 100.00 % KEPCO Middle East Holding Company Holding company Bahrain 100.00 % 100.00 % Qatrana Electric Power Company Construction and operation of utility plant Jordan 80.00 % 80.00 % KHNP Canada Energy Ltd. Holding company Canada 100.00 % 100.00 % KEPCO Bylong Australia Pty., Ltd. Resources development Australia 100.00 % 100.00 % Korea Waterbury Uranium Limited Partnership Resources development Canada 80.00 % 80.00 % KEPCO Holdings de Mexico Holding company Mexico 100.00 % 100.00 % KST Electric Power Company, S.A.P.I. de C.V. Construction and operation of utility plant Mexico 56.00 % 56.00 % KEPCO Energy Service Company Operation of utility plant Mexico 100.00 % 100.00 % KEPCO Netherlands S3 B.V. Holding company Netherlands 100.00 % 100.00 % PT. KOMIPO Pembangkitan Jawa Bali Operation of utility plant Indonesia 51.00 % 51.00 % PT. Cirebon Power Service(*2) Operation of utility plant Indonesia 27.50 % 27.50 % KOWEPO International Corporation Operation of utility plant Philippines 99.99 % 99.99 % KOSPO Jordan LLC Operation of utility plant Jordan 100.00 % 100.00 % EWP America Inc. Holding company USA 100.00 % 100.00 % EWP Renewable Corporation Holding company USA 100.00 % 100.00 % KNF Canada Energy Limited Holding company Canada 100.00 % 100.00 % EWP Barbados 1 SRL Holding company Barbados 100.00 % 100.00 % California Power Holdings, LLC Power generation USA 100.00 % 100.00 % Gyeonggi Green Energy Co., Ltd. Power generation Korea 62.01 % 62.01 % PT. Tanggamus Electric Power Power generation Indonesia 52.50 % 52.50 % Gyeongju Wind Power Co., Ltd. Power generation Korea 70.00 % 70.00 % KOMIPO America Inc. Holding company USA 100.00 % 100.00 % EWPRC Biomass Holdings, LLC Holding company USA 100.00 % — PT. EWP Indonesia Holding company Indonesia 99.96 % 99.96 % KEPCO Netherlands J3 B.V. Holding company Netherlands 100.00 % 100.00 % Korea Offshore Wind Power Co., Ltd. Power generation Korea 100.00 % 100.00 % Global One Pioneer B.V. Holding company Netherlands 100.00 % 100.00 % Global Energy Pioneer B.V. Holding company Netherlands 100.00 % 100.00 % Mira Power Limited(*3) Power generation Pakistan 76.00 % 76.00 % KOSEP Material Co., Ltd. Recycling fly ashes Korea 86.22 % 86.22 % Commerce and Industry Energy Co., Ltd.(*4) RDF power generation Korea 85.03 % 85.03 % KEPCO KPS Philippines Corp. Utility plant maintenance and others Philippines 99.99 % 99.99 % Percentage of ownership (%) Subsidiaries Key operation activities Location 2021 2022 KOSPO Chile SpA Holding company Chile 100.00 % 100.00 % PT. KOWEPO Sumsel Operation And Maintenance Services Utility plant maintenance and others Indonesia 95.00 % 95.00 % Hee Mang Sunlight Power Co., Ltd. Operation of utility plant Korea 100.00 % 100.00 % Fujeij Wind Power Company Operation of utility plant Jordan 100.00 % 100.00 % KOSPO Youngnam Power Co., Ltd.(*5) Operation of utility plant Korea 50.00 % 50.00 % Chitose Solar Power Plant LLC Power generation Japan 65.00 % 65.00 % KEPCO Energy Solution Co., Ltd. Energy service Korea 100.00 % 100.00 % KEPCO Solar Co., Ltd. Power generation Korea 100.00 % 100.00 % KOSPO Power Services Ltda. Utility plant maintenance and others Chile 65.00 % 65.00 % Energy New Industry Specialized Investment Private Investment Trust Holding company Korea 99.01 % 99.01 % KOEN Bylong Pty., Ltd. Resources development Australia 100.00 % 100.00 % KOMIPO Bylong Pty., Ltd. Resources development Australia 100.00 % 100.00 % KOWEPO Bylong Pty., Ltd. Resources development Australia 100.00 % 100.00 % KOSPO Bylong Pty., Ltd. Resources development Australia 100.00 % 100.00 % EWP Bylong Pty., Ltd. Resources development Australia 100.00 % 100.00 % KOWEPO Lao International Utility plant maintenance and others Laos 100.00 % 100.00 % KEPCO US Inc. Holding company USA 100.00 % 100.00 % KEPCO Alamosa LLC Holding company USA 50.10 % — KEPCO Solar of Alamosa LLC Power generation USA 100.00 % — KEPCO Mangilao Holdings LLC Holding company USA 100.00 % 100.00 % Mangilao Investment LLC Holding company USA 100.00 % 80.06 % KEPCO Mangilao Solar, LLC Power generation USA 100.00 % 100.00 % Jeju Hanlim Offshore Wind Co., Ltd. Power generation Korea 79.03 % 79.03 % PT. Siborpa Eco Power Construction and operation of utility plant Indonesia 55.00 % 55.00 % BSK E-New Holding company Korea 81.67 % 81.67 % e-New Holding company Korea 76.11 % 76.11 % Songhyun e-New Holding company Korea 80.65 % 80.65 % BSK E-New Holding company Korea 66.80 % 66.80 % PT. Korea Energy Indonesia Utility plant maintenance and others Indonesia 95.00 % 95.00 % KOLAT SpA Utility plant maintenance and others Chile 100.00 % 100.00 % KEPCO California, LLC Holding company USA 100.00 % 100.00 % KEPCO Mojave Holdings, LLC Holding company USA 100.00 % 100.00 % Incheon Fuel Cell Co., Ltd. Power generation Korea 60.00 % 60.00 % KOEN Service Co., Ltd. Facility maintenance and service Korea 100.00 % 100.00 % KOMIPO Service Co., Ltd. Facility maintenance and service Korea 100.00 % 100.00 % KOWEPO Service Co., Ltd. Facility maintenance and service Korea 100.00 % 100.00 % KOSPO Service Co., Ltd. Facility maintenance and service Korea 100.00 % 100.00 % EWP Service Co., Ltd. Facility maintenance and service Korea 100.00 % 100.00 % PT. KOMIPO Energy Indonesia Utility plant maintenance and others Indonesia 95.00 % 95.00 % KNF Partners Co., Ltd. Facility maintenance and service Korea 100.00 % 100.00 % KOSPO USA Inc. Holding company USA 100.00 % 100.00 % Nambu USA LLC Holding company USA 100.00 % 100.00 % Tamra Offshore Wind Power Co., Ltd. Power generation Korea 63.00 % 63.00 % KEPCO MCS Co., Ltd. Electric meter reading and others Korea 100.00 % 100.00 % KEPCO FMS Co., Ltd. Security service and others Korea 100.00 % 100.00 % Firstkeepers Co., Ltd. Facility maintenance and service Korea 100.00 % 100.00 % Secutec Co., Ltd. Security service Korea 100.00 % 100.00 % SE Green Energy Co., Ltd. Power generation Korea 84.80 % 84.80 % KEPCO Mangilao America LLC Holding company USA 100.00 % — Mangilao Intermediate Holdings LLC Holding company USA 100.00 % 100.00 % KEPCO CSC Co., Ltd. Facility maintenance and service Korea 100.00 % 100.00 % KOAK Power Limited Hydro power facility maintenance Pakistan 100.00 % 100.00 % KOMIPO Europe B.V. Holding company Netherlands 100.00 % 100.00 % Haenanum Energy Fund Holding company Korea 99.64 % 99.64 % Paju Ecoenergy Co., Ltd. Power generation Korea 89.00 % 89.00 % Guam Ukudu Power LLC Power generation USA 100.00 % 100.00 % K-SOLAR SHINAN Co., Ltd. (formerly, TS Energy No. 25 Co., Ltd.) Power generation Korea 90.00 % 90.00 % KPS Partners Co., Ltd. Facility maintenance and service Korea 100.00 % 100.00 % Percentage of ownership (%) Subsidiaries Key operation activities Location 2021 2022 KEPCO E&C Service Co., Ltd. Facility maintenance and service Korea 100.00 % 100.00 % Moha solar Co., Ltd. Power generation Korea 100.00 % 100.00 % Ogiri Solar Power Co., Ltd. Power generation Korea 70.00 % 70.00 % KHNP USA LLC Holding company USA 100.00 % 100.00 % KOMIPO Vanphong Power Service LLC Utility plant maintenance and others Vietnam 100.00 % 100.00 % Energy Innovation Fund I Holding company Korea 71.91 % 71.91 % KHNP Chile SpA Holding company Chile 100.00 % 100.00 % Yeong Yang Apollon Photovoltaic Co., Ltd. Power generation Korea 100.00 % 100.00 % Yeong Yang Corporation Co., Ltd. Power generation Korea 100.00 % 100.00 % SolarVader Co., Ltd. Power generation Korea 100.00 % 100.00 % Yeong Yang Innovation Co., Ltd. Power generation Korea 100.00 % 100.00 % Yeong Yang Horus Photovoltaic Co., Ltd. Power generation Korea 100.00 % 100.00 % Yeong Yang Solar Management Co., Ltd. Power generation Korea 100.00 % 100.00 % LSG Hydro Power Limited Holding company Pakistan 99.80 % 99.80 % KOEN Bio Co., Ltd. Wood pellet utilization business Korea 70.00 % 70.00 % KOMIPO Energy Solution America, LLC Holding company USA 100.00 % 100.00 % Elara Investment Holdings, LLC(*6) Holding company USA 0.10 % 0.10 % Elara Equity Holdings, LLC Holding company USA 54.00 % 54.00 % Elara Class B Holdings, LLC Holding company USA 100.00 % 100.00 % Elara Class B Member, LLC Holding company USA 100.00 % 100.00 % Elara Development Holdings, LLC Holding company USA 100.00 % 100.00 % KOMIPO Development, LLC (formerly, Elara Development, LLC) Holding company USA 100.00 % 100.00 % Elara Energy Holdings, LLC(*6) Holding company USA 43.94 % 43.94 % Elara Energy Project, LLC Power generation USA 100.00 % 100.00 % KOMIPO Iberian Solar Group, S.L.U. Holding company Spain 100.00 % 100.00 % Jeongam Wind Power Co., Ltd. Power generation Korea 80.00 % 80.00 % KOWEPO Europe B.V. Holding company Netherlands 100.00 % 100.00 % CVS Equity Holdings, LLC Holding company USA 100.00 % 81.34 % CVS Class B Holdings, LLC Holding company USA 100.00 % 100.00 % CVS Development Holdings, LLC Holding company USA 100.00 % 100.00 % CVS Development, LLC Holding company USA 100.00 % 100.00 % CVS Class B Member, LLC Holding company USA 100.00 % 100.00 % CVS Energy Holdings, LLC Holding company USA 100.00 % 70.79 % Concho Valley Energy, LLC Holding company USA 100.00 % 100.00 % Concho Valley Solar, LLC Power generation USA 100.00 % 100.00 % Yeongdeok Sunrise Wind Power Co., Ltd. Power generation Korea 70.00 % 70.00 % KHNP Spain, S.L. Holding company Spain 100.00 % 100.00 % UI Carbon-Neutrality Fund Holding company Korea — 78.97 % KA Power Limited Power generation Pakistan — 100.00 % Western Power Changgi Solar Co., Ltd. (formerly, Sam-Yang Photovoltaic Power Co., Ltd.)(*7) Power generation Korea — 100.00 % EWP Australia Pty., Ltd. Holding company Australia — 100.00 % Columboola Solar Farm Hold Co Pty., Ltd.(*8) Power generation Australia — 74.04 % Digital Innovation Growth Fund(*9) Holding company Korea — 76.92 % J Wind First, LLC(*10) Company specializing in liquidization Korea — — KEPCO Holding Company Holding company Saudi Arabia — 100.00 % KEPCO for Power Company Power generation Saudi Arabia — 60.00 % KEPCO for Maintenance Company Utility plant maintenance and others Saudi Arabia — 100.00 % KOSPO Trumbull LLC Holding company USA — 100.00 % Changjuk Wind Power Co., Ltd.(*9) Power generation Korea — 73.00 % (*1) Considering treasury stocks, the effective percentage of ownership is 66.08%. The Company is planning to sell part of its shares (14.77%) based on the resolution of the board of directors on June 24, 2022. (*2) The effective percentage of ownership is less than 50%. However, this subsidiary is included in the consolidated financial statements as the Company obtained the majority of the voting power under the shareholders’ agreement. (*3) As of the reporting date, the annual reporting period of all subsidiaries is December 31, except for Mira Power Limited. (*4) The Company guarantees a certain return on investment related to Commerce and Industry Energy Co., Ltd. for the financial investors. The financial investors have a right to sell their shares to the Company which can be exercised 36 months after the date of investment. Accordingly, the purchase price including the return on investment is classified as a liability. (*5) The subsidiary is included in the consolidated financial statements as the Company owns 50%+1 stake and has the ability to appoint a majority of the board members under the shareholders’ agreement. (*6) The effective percentage of ownership is less than 50%. However, this subsidiary is included in the consolidated financial statements as the Company has control over the board of directors under the shareholders’ agreement. (*7) For the year ended December 31, 2022, the Company included Western Power Changgi Solar Co., Ltd. as a subsidiary, considering that it acquired control over the entity after the entity undertook selective reduction of capital. (*8) Excluding preferred stocks, the percentage of ownership with voting rights is 100%. (*9) The entity was transferred from an associate to a subsidiary due to changes in the consolidated scope during the year ended December 31, 2022. (*10) Although the Company does not hold a stake as of December 31, 2022, considering the purpose and design of the structured entity, the Company is exposed to volatility in the profits of the structured entity. In addition, Group has the ability to direct activities that can most significantly affect the operations of the structured entity, so it has been determined that the Company has control over the entity. (*11) The Company is planning to sell its investment in KEPCO Philippines Holdings Inc., but time or proceeds of sales are not specified as of December 31, 2022. (2) Subsidiaries newly included in and excluded from consolidation for the year ended December 31, 2022 are as follows: Subsidiaries included in consolidation during the year ended December 31, 2022. Subsidiaries Reason UI Carbon-Neutrality Fund Newly established KA Power Limited Newly established Seobusambo highway photovoltaics Co., Ltd. Newly established Western Power Changgi Solar Co., Ltd. (formerly, Sam-Yang Photovoltaic Power Co., Ltd.) Change in the scope of consolidation EWP Australia Pty., Ltd. Newly established Columboola Solar Farm Hold Co Pty., Ltd. New investment Digital Innovation Growth Fund Change in the scope of consolidation J Wind First, LLC Newly established KEPCO Holding Company Newly established KEPCO for Power Company Newly established KEPCO for Maintenance Company Newly established KOSPO Trumbull LLC Newly established Changjuk Wind Power Co., Ltd. Change in the scope of consolidation Subsidiaries excluded from consolidation during the year ended December 31, 2022. Subsidiaries Reason EWPRC Biomass Holdings, LLC Liquidation KEPCO Solar of Alamosa LLC Disposal KEPCO Alamosa LLC Liquidation KEPCO Mangilao America LLC Liquidation Seobusambo highway photovoltaics Co., Ltd. Change in the scope of consolidation (3) Summary of financial information of consolidated subsidiaries as of and for the years ended December 31, 2021 and 2022 are as follows: 2021 Subsidiaries Total Total liabilities Sales Profit (loss) for the year In millions of won Korea Hydro & Nuclear Power Co., Ltd. ￦ 64,638,690 38,361,337 9,324,391 302,232 Korea South-East Power Co., Ltd. 11,487,325 6,510,826 5,188,856 (58,096 ) Korea Midland Power Co., Ltd. 13,761,908 9,912,907 5,353,915 60,737 Korea Western Power Co., Ltd. 10,822,780 7,116,671 4,970,805 (171,562 ) Korea Southern Power Co., Ltd. 11,350,984 7,099,881 5,671,989 (113,352 ) Korea East-West Power Co., Ltd. 9,895,739 5,163,005 4,743,030 10,872 KEPCO Engineering & Construction Company, Inc. 705,043 191,592 433,127 16,452 KEPCO Plant Service & Engineering Co., Ltd. 1,420,705 311,607 1,375,668 98,132 KEPCO Nuclear Fuel Co., Ltd. 837,249 405,614 323,729 25,799 KEPCO KDN Co., Ltd. 721,634 189,242 673,261 67,244 KEPCO International HongKong Ltd. 128,968 — — 341 KEPCO International Philippines Inc. 154,317 482 — 8,766 KEPCO Gansu International Ltd. 7,151 559 — (25 ) KEPCO Philippines Holdings Inc. 191,757 128 — 60,192 KEPCO Philippines Corporation 6,122 19 — (68 ) KEPCO Ilijan Corporation 259,069 38,555 60,532 12,981 KEPCO Lebanon SARL 1,729 9,794 — (86 ) KEPCO Neimenggu International Ltd. 241,299 3,106 — 16,762 KEPCO Shanxi International Ltd. 551,407 207,844 — 3,526 KOMIPO Global Pte Ltd. 302,340 1,351 — 11,462 KEPCO Netherlands B.V. 133,610 866 — 5,395 KEPCO Australia Pty., Ltd. 481 11 — 25 KOSEP Australia Pty., Ltd. 44,798 5,561 22,013 8,268 KOMIPO Australia Pty., Ltd. 54,162 5,648 22,013 5,942 KOWEPO Australia Pty., Ltd. 54,564 4,766 22,013 7,387 KOSPO Australia Pty., Ltd. 43,886 4,502 22,013 5,940 KEPCO Middle East Holding Company 104,068 89,756 — 1,144 Qatrana Electric Power Company 480,809 262,725 21,368 19,156 KHNP Canada Energy Ltd. 109,326 25 — 29 KEPCO Bylong Australia Pty., Ltd. 44,319 394,349 — (37,065 ) Korea Waterbury Uranium Limited Partnership 20,920 159 — (57 ) KEPCO Holdings de Mexico 148 27 — (8 ) KST Electric Power Company, S.A.P.I. de C.V. 584,625 435,796 151,467 18,499 KEPCO Energy Service Company 2,500 956 12,070 574 KEPCO Netherlands S3 B.V. 51,045 150 — 3,199 PT. KOMIPO Pembangkitan Jawa Bali 13,499 3,314 18,296 885 PT. Cirebon Power Service 2,545 631 8,664 505 KOWEPO International Corporation — 10 — — KOSPO Jordan LLC 33,782 16,298 9,698 816 EWP America Inc.(*1) 46,687 1,278 18,335 6,807 KNF Canada Energy Limited 2,101 17 — (43 ) EWP Barbados 1 SRL 354,024 1,172 2,861 16,168 Gyeonggi Green Energy Co., Ltd. 243,977 224,132 93,794 (5,588 ) PT. Tanggamus Electric Power 212,161 167,409 2,903 3,017 Gyeongju Wind Power Co., Ltd. 96,937 60,702 15,289 3,132 KOMIPO America Inc.(*2) 329,986 56,325 1,715 (1,311 ) PT. EWP Indonesia 47,031 1,226 — 4,615 KEPCO Netherlands J3 B.V. 151,478 172 — 27,365 Korea Offshore Wind Power Co., Ltd. 359,393 188,507 36,020 3,820 Global One Pioneer B.V. 119 116 — (132 ) Global Energy Pioneer B.V. 293 131 — (147 ) 2021 Subsidiaries Total Total liabilities Sales Profit (loss) for the year In millions of won Mira Power Limited ￦ 424,183 311,459 70,287 34,018 KOSEP Material Co., Ltd. 3,405 842 4,518 442 Commerce and Industry Energy Co., Ltd. 85,315 35,543 30,531 1,345 KEPCO KPS Philippines Corp. 8,051 3,652 9,768 1,493 KOSPO Chile SpA 142,956 56,688 — (851 ) PT. KOWEPO Sumsel Operation And Maintenance Services 116 259 — — Hee Mang Sunlight Power Co., Ltd. 6,242 3,272 499 47 Fujeij Wind Power Company 200,783 169,340 — 14,739 KOSPO Youngnam Power Co., Ltd. 393,745 292,765 318,770 6,339 Chitose Solar Power Plant LLC 125,578 109,470 16,630 1,794 KEPCO Energy Solution Co., Ltd. 317,676 4,938 21,423 3,104 KEPCO Solar Co., Ltd. 231,567 22,229 11,305 2,014 KOSPO Power Services Ltda. 8,007 5,800 21,133 (356 ) Energy New Industry Specialized Investment Private Investment Trust(*3) 336,932 28,536 19,405 11,116 KOEN Bylong Pty., Ltd. 8 86 — — KOMIPO Bylong Pty., Ltd. 8 86 — (8 ) KOWEPO Bylong Pty., Ltd. 8 86 — (18 ) KOSPO Bylong Pty., Ltd. 73 168 — (20 ) EWP Bylong Pty., Ltd. 8 54 — — KOWEPO Lao International 12,974 70 8,543 5,681 KEPCO US Inc. 17,601 — — — KEPCO Alamosa LLC 34,100 297 124 (62 ) KEPCO Solar of Alamosa LLC 57,104 41,953 8,008 (742 ) KEPCO Mangilao Holdings LLC 28,504 32,501 — (556 ) Mangilao Investment LLC 43,459 29 — (14 ) KEPCO Mangilao Solar, LLC 206,018 166,095 — (865 ) Jeju Hanlim Offshore Wind Co., Ltd. 41,325 5,139 — (2,893 ) PT. Siborpa Eco Power 11,306 — — (105 ) PT. Korea Energy Indonesia 1,917 215 1,681 37 KOLAT SpA 28,349 849 180 (464 ) KEPCO California, LLC 43,732 4,113 1,310 160 KEPCO Mojave Holdings, LLC 95,294 71,358 — (4,254 ) Incheon Fuel Cell Co., Ltd. 268,100 236,901 54,188 8,738 KOEN Service Co., Ltd. 8,963 6,557 35,190 2,326 KOMIPO Service Co., Ltd. 4,384 4,475 32,323 (96 ) KOWEPO Service Co., Ltd. 7,289 5,869 31,700 303 KOSPO Service Co., Ltd. 5,762 4,990 26,257 31 EWP Service Co., Ltd. 5,483 5,455 24,957 14 PT. KOMIPO Energy Indonesia 2,996 395 2,077 106 KNF partners Co., Ltd. 1,800 969 5,664 152 KOSPO USA Inc. 286,081 293 — 968 Nambu USA LLC 277,698 — — 568 Tamra Offshore Wind Power Co., Ltd. 146,736 106,961 21,731 5,168 KEPCO MCS Co., Ltd. 80,277 39,139 349,116 19,043 KEPCO FMS Co., Ltd. 17,188 15,577 94,210 214 Firstkeepers Co., Ltd. 17,152 16,041 77,189 19 Secutec Co., Ltd. 13,176 10,662 65,963 1,774 SE Green Energy Co., Ltd. 153,105 119,461 38,867 4,025 KEPCO Mangilao America LLC 2,173 1 — — Mangilao Intermediate Holdings LLC 220,690 205,421 — (6,975 ) KEPCO CSC Co., Ltd. 8,093 6,799 41,854 (2,101 ) KOAK Power Limited 14,363 393 — (551 ) 2021 Subsidiaries Total Total liabilities Sales Profit (loss) for the year In millions of won KOMIPO Europe B.V. ￦ 70,431 97 402 (503 ) Haenanum Energy Fund 7,463 3 40 (74 ) Paju Ecoenergy Co., Ltd. 57,795 2,118 15,425 2,234 Guam Ukudu Power LLC 30,133 30,438 — (2,030 ) K-SOLAR SHINAN Co., Ltd. (formerly, TS Energy No. 25 Co., Ltd.) 353,324 318,977 421 (7,525 ) KPS Partners Co., Ltd. 2,809 1,529 9,520 323 KEPCO E&C Service Co., Ltd. 4,054 1,889 15,985 1,242 Moha solar Co., Ltd. 32,808 33,933 48 (706 ) Ogiri Solar Power Co., Ltd. 1,041 1 — 9 KHNP USA LLC 766 10 1,001 267 KOMIPO Vanphong Power Service LLC 3,758 860 3,853 958 Energy Innovation Fund I 22,616 3,202 — (888 ) KHNP Chile SpA 5,294 3,879 — 17 Yeong Yang Apollon Photovoltaic Co., Ltd. 1,775 1,632 5 (30 ) Yeong Yang Corporation Co., Ltd. 1,776 1,623 9 (19 ) SolarVader Co., Ltd. 1,772 1,627 — (26 ) Yeong Yang Innovation Co., Ltd. 1,773 1,622 5 (21 ) Yeong Yang Horus Photovoltaic Co., Ltd. 1,771 1,624 9 (24 ) Yeong Yang Solar Management Co., Ltd. 1,774 1,625 — (23 ) LSG Hydro Power Limited 1 — — — KOEN Bio Co., Ltd. 394 199 51 (305 ) KOMIPO Iberian Solar Group, S.L.U. 70,993 56,707 — 1,354 Jeongam Wind Power Co., Ltd. 86,853 74,267 10,476 1,027 KOWEPO Europe B.V. 39,973 1,449 — (744 ) Yeongdeok Sunrise Wind Power Co., Ltd. 21,252 768 — (116 ) KHNP Spain, S.L. 5 — — — (*1) Financial information of EWP America Inc. includes that of three other subsidiaries, EWP Renewable Corporation, California Power Holdings, LLC and EWPRC Biomass Holdings, LLC. (*2) Financial information of KOMIPO America Inc. includes that of 17 other subsidiaries including Elara Equity Holdings, LLC and CVS Equity Holdings, LLC. (*3) Financial information of Energy New Industry Specialized Investment Private Investment Trust includes that of four other subsidiaries, BSK E-New e-New e-New E-New 2022 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won Korea Hydro & Nuclear Power Co., Ltd. ￦ 69,129,625 42,843,974 10,386,091 (16,382 ) Korea South-East Power Co., Ltd. 13,855,071 7,410,881 8,972,991 71,662 Korea Midland Power Co., Ltd. 16,062,605 10,776,943 8,629,165 (58,173 ) Korea Western Power Co., Ltd. 13,459,054 8,125,312 8,112,727 106,361 Korea Southern Power Co., Ltd. 14,011,354 8,296,983 9,304,362 (68,315 ) Korea East-West Power Co., Ltd. 12,079,954 5,818,789 6,925,094 2,888 KEPCO Engineering & Construction Company, Inc. 815,533 272,119 505,291 17,954 KEPCO Plant Service & Engineering Co., Ltd. 1,555,453 344,702 1,425,913 97,881 KEPCO Nuclear Fuel Co., Ltd. 949,455 490,215 304,405 31,508 KEPCO KDN Co., Ltd. 734,439 166,272 739,453 42,584 KEPCO International HongKong Ltd. 128,784 — — (216 ) KEPCO International Philippines Inc. 127,744 101 — 9,976 KEPCO Gansu International Ltd. 7,125 598 — (22 ) KEPCO Philippines Holdings Inc. 191,634 129 — 39,346 KEPCO Philippines Corporation 3,799 14 — 102 KEPCO Ilijan Corporation 231,132 3,642 23,263 16,455 KEPCO Lebanon SARL 1,890 10,482 — 20 KEPCO Neimenggu International Ltd. 269,582 3,917 — 9,938 KEPCO Shanxi International Ltd. 597,635 222,186 — (11,312 ) KOMIPO Global Pte Ltd. 388,071 1,817 — 58,030 KEPCO Netherlands B.V. 137,454 64 — 8,570 KEPCO Australia Pty., Ltd. 579 11 — 102 KOSEP Australia Pty., Ltd. 74,180 13,097 52,271 24,443 KOMIPO Australia Pty., Ltd. 81,216 10,327 52,272 23,368 KOWEPO Australia Pty., Ltd. 81,696 10,184 52,271 22,745 KOSPO Australia Pty., Ltd. 41,872 10,174 52,271 24,362 KEPCO Middle East Holding Company 116,731 102,054 — (634 ) Qatrana Electric Power Company 513,277 247,027 24,354 22,578 KHNP Canada Energy Ltd. 107,200 6,218 — 149 KEPCO Bylong Australia Pty., Ltd. 44,034 437,852 — (45,880 ) Korea Waterbury Uranium Limited Partnership 20,934 224 — (116 ) KEPCO Holdings de Mexico 728 1,974 — (1,363 ) KST Electric Power Company, S.A.P.I. de C.V. 653,830 528,315 232,893 23,122 KEPCO Energy Service Company 2,238 2,173 7,015 (211 ) KEPCO Netherlands S3 B.V. 71,326 16,419 — 4,465 PT. KOMIPO Pembangkitan Jawa Bali 15,753 3,232 22,488 3,668 PT. Cirebon Power Service 2,316 784 9,602 355 KOWEPO International Corporation — 10 — — KOSPO Jordan LLC 22,854 6,964 45,009 7,657 EWP America Inc.(*1) 47,775 2,595 21,717 4,337 KNF Canada Energy Limited 2,116 34 — (59 ) EWP Barbados 1 SRL 395,067 901 3,230 34,260 Gyeonggi Green Energy Co., Ltd. 220,414 226,517 112,524 (26,004 ) PT. Tanggamus Electric Power 227,638 163,106 3,781 5,778 Gyeongju Wind Power Co., Ltd. 98,513 55,579 24,888 9,711 KOMIPO America Inc.(*2) 571,200 317,903 34,059 (3,293 ) PT. EWP Indonesia 93,390 5 — 4,100 KEPCO Netherlands J3 B.V. 135,213 63 — 19,396 Korea Offshore Wind Power Co., Ltd. 376,449 192,335 52,526 13,083 Global One Pioneer B.V. 135 41 — (68 ) Global Energy Pioneer B.V. 320 40 — (64 ) Mira Power Limited 416,750 310,529 57,135 12,394 KOSEP Material Co., Ltd. 3,985 662 4,589 775 Commerce and Industry Energy Co., Ltd. 79,172 32,147 31,068 (3,730 ) KEPCO KPS Philippines Corp. 5,294 600 5,232 1,004 KOSPO Chile SpA 159,500 70,037 — (2,811 ) PT. KOWEPO Sumsel Operation And Maintenance Services 25 252 — (94 ) 2022 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won Hee Mang Sunlight Power Co., Ltd. ￦ 5,877 2,606 862 304 Fujeij Wind Power Company 213,113 163,690 — 16,564 KOSPO Youngnam Power Co., Ltd. 425,000 312,831 568,224 10,878 Chitose Solar Power Plant LLC 109,964 94,366 14,384 1,615 KEPCO Energy Solution Co., Ltd. 317,392 6,147 33,638 138 KEPCO Solar Co., Ltd. 243,221 25,405 24,778 9,305 KOSPO Power Services Ltda. 6,722 4,762 17,911 (358 ) Energy New Industry Specialized Investment Private Investment Trust(*3) 451,762 4,338 24,725 7,093 KOEN Bylong Pty., Ltd. 11 119 — (12 ) KOMIPO Bylong Pty., Ltd. 11 122 — (33 ) KOWEPO Bylong Pty., Ltd. 8 94 — (7 ) KOSPO Bylong Pty., Ltd. 25 148 — (17 ) EWP Bylong Pty., Ltd. 8 54 — 1 KOWEPO Lao International 8,248 87 10,010 11,185 KEPCO US Inc. 91 — — (19,181 ) KEPCO Mangilao Holdings LLC 112,948 40,558 21,743 21,166 Mangilao Investment LLC 258,674 4 — (1 ) KEPCO Mangilao Solar, LLC 240,736 373 8,870 (14,818 ) Jeju Hanlim Offshore Wind Co., Ltd. 185,357 111,343 — (3,546 ) PT. Siborpa Eco Power 12,050 3 — (39 ) PT. Korea Energy Indonesia 1,675 80 1,937 (104 ) KOLAT SpA 48,787 3,701 1,647 1,888 KEPCO California, LLC 46,151 4,768 596 (670 ) KEPCO Mojave Holdings, LLC 95,550 75,846 — (4,705 ) Incheon Fuel Cell Co., Ltd. 268,063 242,176 107,193 (5,323 ) KOEN Service Co., Ltd. 9,353 7,035 36,340 356 KOMIPO Service Co., Ltd. 6,597 4,503 35,031 905 KOWEPO Service Co., Ltd. 6,266 3,130 34,031 171 KOSPO Service Co., Ltd. 6,672 5,048 28,321 60 EWP Service Co., Ltd. 3,756 2,507 24,526 581 PT. KOMIPO Energy Indonesia 2,978 368 1,698 83 KNF partners Co., Ltd. 2,285 1,053 5,997 293 KOSPO USA Inc. 315,018 430 — 5,024 Nambu USA LLC 297,516 — — 670 Tamra Offshore Wind Power Co., Ltd. 133,598 93,639 18,332 5,316 KEPCO MCS Co., Ltd. 114,316 52,241 363,627 8,468 KEPCO FMS Co., Ltd. 16,852 11,667 105,339 2,176 Firstkeepers Co., Ltd. 16,448 12,912 84,620 2,482 Secutec Co., Ltd. 12,578 9,209 69,383 690 SE Green Energy Co., Ltd. 149,189 114,241 49,873 1,304 Mangilao Intermediate Holdings LLC 236,266 116,426 — (4,709 ) KEPCO CSC Co., Ltd. 10,668 8,937 46,559 (2,134 ) KOAK Power Limited 12,626 839 — 49 KOMIPO Europe B.V. 81,364 54 1,195 1,134 Haenanum Energy Fund 7,416 3 — (48 ) Paju Ecoenergy Co., Ltd. 61,930 3,066 20,718 1,290 Guam Ukudu Power LLC 293,422 323,292 — (31,410 ) K-SOLAR 320,227 296,141 16,980 3,690 KPS Partners Co., Ltd. 3,619 2,007 12,417 487 KEPCO E&C Service Co., Ltd. 5,676 1,897 16,180 1,493 Moha solar Co., Ltd. 29,096 31,359 169 (1,137 ) Ogiri Solar Power Co., Ltd. 1,033 23 — (30 ) KHNP USA LLC 1,290 97 1,127 392 KOMIPO Vanphong Power Service LLC 15,940 3,333 20,233 9,871 Energy Innovation Fund I 35,310 445 — (961 ) KHNP Chile SpA 5,547 4,147 — (16 ) Yeong Yang Apollon Photovoltaic Co., Ltd. 1,566 1,507 254 (82 ) 2022 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won Yeong Yang Corporation Co., Ltd. ￦ 1,559 1,497 251 (91 ) SolarVader Co., Ltd. 1,568 1,500 256 (78 ) Yeong Yang Innovation Co., Ltd. 1,557 1,497 244 (91 ) Yeong Yang Horus Photovoltaic Co., Ltd. 1,552 1,498 243 (93 ) Yeong Yang Solar Management Co., Ltd. 1,573 1,500 262 (75 ) LSG Hydro Power Limited 1,144 1,159 — (18 ) KOEN Bio Co., Ltd. 261 219 639 (150 ) KOMIPO Iberian Solar Group, S.L.U. 78,094 65,012 — (1,304 ) Jeongam Wind Power Co., Ltd. 81,800 68,317 10,722 892 KOWEPO Europe B.V. 42,865 2,422 — 1,668 Yeongdeok Sunrise Wind Power Co., Ltd. 42,187 22,031 — (328 ) KHNP Spain, S.L. 3 — — (1 ) KA Power Limited 3,937 418 — 442 Western Power Changgi Solar Co., Ltd. (formerly, Sam-Yang 48,770 44,647 3,447 (354 ) EWP Australia Pty., Ltd. 51,105 — — 15,203 Columboola Solar Farm Hold Co Pty., Ltd. 310,271 214,792 2,228 2,884 Digital Innovation Growth Fund 12,594 100 — (363 ) J Wind First, LLC 33,611 33,611 450 — KEPCO Holding Company 3,273 17 — (18 ) KEPCO for Power Company 57,501 58,441 — (960 ) KEPCO for Maintenance Company — — — — KOSPO Trumbull LLC 37 3 — — Changjuk Wind Power Co., Ltd. 29,208 3,137 9,027 3,503 (*1) Financial information of EWP America Inc. includes that of two other subsidiaries, EWP Renewable Corporation, and California Power Holdings, LLC. (*2) Financial information of KOMIPO America Inc. includes that of 17 other subsidiaries including Elara Equity Holdings, LLC and CVS Equity Holdings, LLC. (*3) Financial information of Energy New Industry Specialized Investment Private Investment Trust includes that of five other subsidiaries, BSK E-New e-New e-New E-New (4) Significant restrictions on abilities to subsidiaries are as follows: Company Nature and extent of any significant restrictions Gyeonggi Green Energy Co., Ltd. Acquisition or disposal of assets of more than ￦35 billion, change in the capacity of cogeneration units (except for the change due to performance improvement of equipment, maintenance) will require unanimous consent of all directors of the Company. KOSPO Youngnam Power Co., Ltd. Dividends can only be paid when all conditions of the loan agreement are satisfied, or prior written consent of financial institutions is obtained. Group’s shares cannot be wholly or partially transferred without prior written consent of financial institutions. Jeongam Wind Power Co., Ltd. Dividends can only be paid when all conditions of the loan agreement are satisfied, and payments to the contracting party may be restricted depending on the financial management priority of the contract. Group’s shares cannot be wholly or partially transferred without prior consent of other stakeholders including shareholders or financial institutions. Incheon Fuel Cell Co., Ltd. Acquisition or disposal of assets of more than ￦20 billion, change in the capacity of cogeneration units (except for the change due to performance improvement of equipment, maintenance) will require unanimous consent of all directors of the Company. Gyeongju Wind Power Co., Ltd. Dividends and settlement amounts for O&M and r

Investments in Associates and J

Investments in Associates and Joint Ventures	12 Months Ended
	Dec. 31, 2022
Investments in Associates and Joint Ventures [Abstract]
Investments in Associates and Joint Ventures	17. Investments in Associates and Joint Ventures (1) Investments in associates and joint ventures as of December 31, 2021 and 2022 are as follows: 2021 Investees Key operation activities Location Percentage of Acquisition Book value In millions of won <Associates> Korea Gas Corporation(*1) Importing and wholesaling LNG Korea 20.47 % ￦ 94,500 1,815,513 Korea Electric Power Industrial Development Co., Ltd. Electricity metering and others Korea 29.00 % 4,727 24,617 YTN Co., Ltd. Broadcasting Korea 21.43 % 59,000 51,828 Gangwon Wind Power Co., Ltd.(*2) Power generation Korea 15.00 % 5,725 10,554 Hyundai Green Power Co., Ltd. Power generation equipment consignment and operation service Korea 29.00 % 88,885 121,955 Korea Power Exchange(*3) Management of power market and others Korea 100.00 % 127,839 269,728 Taebaek Wind Power Co., Ltd. Power generation Korea 25.00 % 3,810 6,800 Taebaek Guinemi Wind Power Co., Ltd. Power generation Korea 25.00 % 3,420 3,357 Pyeongchang Wind Power Co., Ltd. Power generation Korea 25.00 % 3,875 5,411 Daeryun Power Co., Ltd.(*2) Power generation Korea 9.34 % 40,854 25,426 Changjuk Wind Power Co., Ltd. Power generation Korea 30.00 % 3,801 8,355 KNH Solar Co., Ltd. Power generation Korea 27.00 % 1,296 2,278 SPC Power Corporation Power generation Philippines 38.00 % 20,635 65,046 Gemeng International Energy Co., Ltd. Power generation China 34.00 % 413,153 595,218 PT. Cirebon Electric Power Power generation Indonesia 27.50 % 40,365 121,969 KNOC Nigerian East Oil Co., Ltd.(*4) Resources development Nigeria 14.63 % 12 — KNOC Nigerian West Oil Co., Ltd.(*4) Resources development Nigeria 14.63 % 12 — PT Wampu Electric Power Power generation Indonesia 46.00 % 21,292 35,077 PT. Bayan Resources TBK Resources development Indonesia 20.00 % 615,860 661,289 S-Power Co., Ltd. Power generation Korea 49.00 % 132,300 122,786 Pioneer Gas Power Limited Power generation India 38.50 % 49,831 — Eurasia Energy Holdings Power generation and resources development Russia 40.00 % 461 — Xe-Pian Xe-Namnoy Power Co., Ltd. Power generation Laos 25.00 % 87,426 92,441 PT. Mutiara Jawa Manufacturing and operating floating coal terminal Indonesia 29.00 % 2,978 2,569 Samcheok Eco Materials Co., Ltd.(*5) Recycling fly ashes Korea 2.35 % 686 — Noeul Green Energy Co., Ltd. Power generation Korea 29.00 % 1,740 3,808 Goseong Green Power Co., Ltd. Power generation Korea 29.00 % 262,740 260,858 Gangneung Eco Power Co., Ltd.(*2) Power generation Korea 1.61 % 2,900 2,288 Shin Pyeongtaek Power Co., Ltd. Power generation Korea 40.00 % 72,000 93,074 Haeng Bok Do Si Photovoltaic Power Co., Ltd. Power generation Korea 28.00 % 194 223 Dongducheon Dream Power Co., Ltd.(*6) Power generation Korea 33.61 % 148,105 74,198 Jinbhuvish Power Generation Pvt. Ltd.(*2) Power generation India 5.16 % 9,000 — Daejung Offshore Wind Power Co., Ltd. Power generation Korea 46.59 % 5,190 1,704 GS Donghae Electric Power Co., Ltd. Power generation Korea 34.00 % 204,000 243,772 Daegu Photovoltaic Co., Ltd. Power generation Korea 29.00 % 1,230 2,342 Busan Green Energy Co., Ltd. Power generation Korea 29.00 % 5,243 5,032 Gunsan Bio Energy Co., Ltd.(*2) Power generation Korea 18.87 % 1,000 — Korea Electric Vehicle Charging Service(*2) Electric vehicle charge service Korea 17.50 % 2,800 1,250 Hansuwon KNP Co., Ltd. Electric material agency Korea 28.98 % 537 219 Korea Electric Power Corporation Fund(*7) Developing electric enterprises Korea 98.09 % 48,410 47,983 Energy Infra Asset Management Co., Ltd.(*2) Asset management Korea 9.90 % 297 1,066 Daegu clean Energy Co., Ltd. Renewable power generation Korea 28.00 % 140 12 YaksuESS Co., Ltd. Installing ESS related equipment Korea 29.00 % 210 716 Nepal Water & Energy Development Company Private Limited(*8) Construction and operation of utility plant Nepal 69.06 % 70,228 66,333 Gwangyang Green Energy Co., Ltd. Power generation Korea 20.00 % 26,800 25,466 PND Solar Co., Ltd. Power generation Korea 29.00 % 1,250 1,229 Hyundai Eco Energy Co., Ltd.(*2) Power generation Korea 19.00 % 3,610 5,572 YeongGwang Yaksu Wind Electric Co., Ltd.(*2) Power generation Korea 9.63 % 533 233 Green Energy Electricity Generation Co., Ltd. Power generation Korea 29.00 % 1,189 1,713 2021 Investees Key operation activities Location Percentage of Acquisition Book value In millions of won <Associates> Korea Energy Solutions Co., Ltd. R & D Korea 20.00 % ￦ 300 123 ITR Co., Ltd. R & D Korea 20.00 % 50 32 Structure test network Co., Ltd. Technical testing and consulting Korea 20.00 % 25 306 Namjeongsusang Solar Power Operation Co., Ltd.(*9) Power generation Korea 15.00 % 969 361 Indeck Niles Development, LLC(*10) Power generation USA 56.25 % 268,113 246,273 Indeck Niles Asset Management, LLC Power generation USA 33.33 % — 111 Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 Holding company Korea 49.00 % 7,112 7,138 Suwon New Power Co., Ltd. Power generation Korea 39.90 % 798 1,035 KPGE Inc. Power generation materials business Korea 29.00 % 287 309 Gwangbaek Solar Power Investment Co., Ltd. Power generation Korea 44.00 % 4,757 4,806 Go deok Clean Energy Co., Ltd. Fuel cell generation Korea 40.00 % 5,560 4,302 SureDataLab Co., Ltd. R & D Korea 23.95 % 126 128 SEP Co., Ltd. R & D Korea 21.26 % 27 7 Hankook Electric Power Information Co., Ltd. R & D Korea 25.25 % 38 161 Tronix Co., Ltd. R & D Korea 20.00 % 75 109 O2&B Global Co., Ltd. R & D Korea 20.00 % 25 35 Muan Sunshine Solar Power Plant Co., Ltd. Power generation Korea 20.00 % 1,570 1,268 Bigeum Resident Photovoltaic Power Co., Ltd. Power generation Korea 29.90 % 1 — Goesan Solar Park Co., Ltd. Power generation Korea 29.00 % 1,276 1,927 Saemangeum Heemang Photovoltaic Co., Ltd. Power generation Korea 35.00 % 11,022 10,238 Bitgoel Eco Energy Co., Ltd. Power generation Korea 29.00 % 4,640 4,356 Jeju Gimnyeong Wind Power Co., Ltd. Power generation Korea 30.00 % 714 911 Seoroseoro Sunny Power Plant Co., Ltd. Power generation Korea 42.58 % 706 721 Muan Solar Park Co., Ltd. Power generation Korea 20.00 % 4,400 6,083 YuDang Solar Co., Ltd. Power generation Korea 20.00 % 360 565 Anjwa Smart Farm & Solar City Co., Ltd. Power generation Korea 20.00 % 5,651 6,784 Daewon Green Energy Co., Ltd. Power generation Korea 25.36 % 3,910 3,877 G.GURU Co., Ltd. R & D Korea 24.65 % 493 403 UD4M Co., Ltd.(*2) R & D Korea 12.50 % 75 144 Dongbu Highway Solar Co., Ltd. Power generation Korea 20.00 % 190 265 Seobu Highway Solar Co., Ltd. Power generation Korea 20.00 % 195 289 Korea Energy Data Co., Ltd. R & D Korea 29.37 % 60 62 Gangneung Sacheon Fuel Cell Co., Ltd.(*7) Power generation Korea 65.00 % 1,950 1,878 Kosture Co., Ltd.(*2) Coal recycling business Korea 0.26 % — — Digital Innovation Growth Fund(*7) Holding company Korea 76.92 % 10,000 9,890 Taebaek Gadeoksan Wind Power Co., Ltd.(*18) Power generation Korea 39.65 % 12,570 16,495 Chuncheon Green Energy Co., Ltd.(*7) Power generation Korea 68.00 % 3,400 3,372 Yeomsubong Wind Power Co., Ltd. Power generation Korea 48.72 % 95 95 Yeongyang Wind Power Corporation II Power generation Korea 30.00 % 7,965 7,965 Haeparang Energy Co., Ltd. Power generation Korea 25.00 % 2,241 2,241 Saemangeum Sebit Power Plant Co., Ltd.(*7) Power generation Korea 69.55 % 6,000 6,000 3,059,835 5,232,373 <Joint ventures> KEPCO-Uhde Inc.(*11) Power generation Korea 52.80 % 11,355 58 Shuweihat Asia Power Investment B.V. Holding company Netherlands 49.00 % 44,405 37,069 Shuweihat Asia Operation & Maintenance Company(*11) Maintenance of utility plant Cayman 55.00 % 30 1,380 Waterbury Lake Uranium L.P. Resources development Canada 33.10 % 26,602 21,590 ASM-BG Investicii AD Power generation Bulgaria 50.00 % 16,101 18,692 RES Technology AD Power generation Bulgaria 50.00 % 15,595 16,703 KV Holdings, Inc. Power generation Philippines 40.00 % 2,103 2,527 2021 Investees Key operation activities Location Percentage of Acquisition Book value In millions of won <Joint ventures> KEPCO SPC Power Corporation(*11) Construction and operation of utility plant Philippines 75.20 % ￦ 94,579 198,979 Gansu Datang Yumen Wind Power Co., Ltd. Power generation China 40.00 % 16,621 6,635 Datang Chifeng Renewable Power Co., Ltd. Power generation China 40.00 % 121,928 204,587 Datang KEPCO Chaoyang Renewable Power Co., Ltd. Power generation China 40.00 % 39,872 44,217 Rabigh Electricity Company Power generation Saudi Arabia 40.00 % 109,743 143,678 Rabigh Operation & Maintenance Company Limited Maintenance of utility plant Saudi Arabia 40.00 % 70 4,071 Jamaica Public Service Company Limited Power generation Jamaica 40.00 % 301,910 294,649 KW Nuclear Components Co., Ltd. Manufacturing Korea 45.00 % 833 15,734 Busan Shinho Solar Power Co., Ltd. Power generation Korea 25.00 % 2,100 5,841 Global Trade Of Power System Co., Ltd.(*12) Exporting products and technology of small or medium business by proxy Korea 29.00 % 290 597 Expressway Solar-light Power Generation Co., Ltd.(*12) Power generation Korea 29.00 % 1,856 3,084 Amman Asia Electric Power Company(*11) Power generation Jordan 60.00 % 111,476 178,679 KAPES, Inc.(*11) R & D Korea 51.00 % 5,629 — Honam Wind Power Co., Ltd. Power generation Korea 29.00 % 3,480 4,041 Korea Power Engineering Service Co., Ltd. Construction and service Korea 29.00 % 290 5,415 Chun-cheon Energy Co., Ltd. Power generation Korea 29.90 % 52,700 25,896 Yeonggwangbaeksu Wind Power Co., Ltd.(*12) Power generation Korea 15.00 % 3,000 2,728 Nghi Son 2 Power LLC Power generation Vietnam 50.00 % 2,781 — Kelar S.A.(*11) Power generation Chile 65.00 % 78,060 86,695 PT. Tanjung Power Indonesia Power generation Indonesia 35.00 % 26,892 46,546 Incheon New Power Co., Ltd.(*13) Power generation Korea 29.00 % 461 — Seokmun Energy Co., Ltd. Power generation Korea 29.00 % 15,370 13,842 Daehan Wind Power PSC Power generation Jordan 50.00 % 7,493 5,154 Barakah One Company(*14) Power generation UAE 18.00 % 118 — Nawah Energy Company(*14) Operation of utility plant UAE 18.00 % 296 294 Momentum International thermonuclear experimental reactor construction management France 33.33 % 1 368 Daegu Green Power Co., Ltd.(*15) Power generation Korea 29.00 % 46,225 24,054 Yeonggwang Wind Power Co., Ltd. Power generation Korea 46.00 % 17,475 17,646 Chester Solar IV SpA Power generation Chile 45.00 % 1,700 — Chester Solar V SpA Power generation Chile 45.00 % 525 25 Diego de Almagro Solar SpA Power generation Chile 45.00 % 2,091 362 South Jamaica Power Company Limited Power generation Jamaica 20.00 % 20,430 37,360 Daesan Green Energy Co., Ltd. Power generation Korea 35.00 % 17,850 21,244 RE Holiday Holdings LLC Power generation USA 50.00 % 42,948 73,167 RE Pioneer Holdings LLC Power generation USA 50.00 % 27,891 47,015 RE Barren Ridge 1 Holdings LLC Power generation USA 50.00 % 28,021 1,883 RE Astoria 2 LandCo LLC Power generation USA 50.00 % 5,188 5,998 RE Barren Ridge LandCo LLC Power generation USA 50.00 % 2,187 2,120 Laurel SpA Power generation Chile 45.00 % 1,222 290 KIAMCO KOWEPO Bannerton Hold Co Pty Ltd(*12) Power generation Australia 12.37 % 4,095 3,625 Chile Solar JV SpA Power generation Chile 50.00 % 37,689 32,457 Cheong-Song Noraesan Wind Power Co., Ltd. Power generation Korea 29.01 % 3,200 4,106 Chester Solar I SpA Power generation Chile 45.00 % 1,181 1,120 Solar Philippines Calatagan Corporation Power generation Philippines 38.00 % 47,903 58,231 Saemangeum Solar Power Co., Ltd.(*16) Power generation Korea 81.01 % 26,400 23,939 Chungsongmeon BongSan wind power Co., Ltd.(*12) Power generation Korea 29.00 % 2,900 3,808 Jaeun Resident Wind Power Plant Co., Ltd. Power generation Korea 29.00 % 2,494 1,958 2021 Investees Key operation activities Location Percentage of Acquisition Book value In millions of won <Joint ventures> DE Energia SpA Power generation Chile 49.00 % ￦ 8,364 8,921 Dangjin Eco Power Co., Ltd. Power generation Korea 34.00 % 25,661 26,109 Haemodum Solar Co., Ltd. Power generation Korea 49.00 % 2,940 3,081 Yangyang Wind Power Co., Ltd. Power generation Korea 50.00 % 12,000 11,191 Horus Solar, S.A. De C.V.(*17) Renewable power generation Mexico 14.95 % 5,068 5,842 Recursos Solares PV De Mexico II, S.A. De C.V.(*17) Renewable power generation Mexico 14.95 % 3,678 4,536 Sunmex Renovables, S.A. De C.V.(*17) Renewable power generation Mexico 14.95 % 1,678 1,610 Stavro Holding II A.B. Holding company Sweden 20.00 % 17,615 17,627 Solaseado Solar Power Co., Ltd. Power generation Korea 38.90 % 7,020 9,891 Yeongam Solar Power Co., Ltd.(*12) Power generation Korea 19.00 % 6,460 6,838 Samsu Wind Power Co., Ltd.(*12) Power generation Korea 19.00 % 2,637 2,828 Pulau Indah Power Plant Sdn. Bhd. Power generation Malaysia 25.00 % 23,833 22,099 Sam-Yang Photovoltaic Power Co., Ltd. Power generation Korea 49.00 % 5,245 4,993 NH-Amundi Global Infrastructure Investment Private Investment Trust 21 Holding company Korea 29.53 % 19,983 21,456 Shin-han BNPP Private Investment Trust for East-West Sunlight Dream(*11) Holding company Korea 90.00 % 15,699 16,288 PT Barito Wahana Tenaga Power generation Indonesia 30.61 % 59,535 81,595 Cheongna Energy Co., Ltd.(*16) Generating and distributing vapor and hot/cold water Korea 50.10 % 49,344 11,198 Naepo Green Energy Co., Ltd. Power generation Korea 29.20 % 29,200 — Dayone Energy Co., Ltd.(*19) Power generation Korea 30.66 % 71,070 — OneEnergy Asia Limited Power generation Vietnam 40.00 % 76,916 79,700 KAS Investment I LLC Holding company USA 29.89 % 23,437 15,273 KAS Investment II LLC Holding company USA 29.89 % 23,343 15,213 Energyco Co., Ltd. Power generation Korea 29.00 % 1,659 1,535 CAES, LLC Holding company USA 36.00 % 19,414 18,435 Hapcheon Floating Photovoltaic Power Plant Inc.(*12) Power generation Korea 49.00 % 7,512 6,971 Busan Industrial Solar Power Co., Ltd. Power generation Korea 28.02 % 510 612 Bitsolar Energy Co., Ltd. Power generation Korea 27.10 % 352 352 Pulau Indah O&M Sdn. Bhd.(*20) Power generation Malaysia 60.00 % — — Guadalupe Solar SpA(*20) Power generation Chile 60.00 % 1,397 659 Omisan Wind Power Co., Ltd. Power generation Korea 42.00 % 10,752 10,633 Foresight Iberian Solar Group Holding, S.L.(*20) Power generation Spain 75.00 % 9,697 9,743 Yeongwol Eco Wind Co., Ltd. Power generation Korea 29.00 % 3,089 3,196 Gurae Resident Power Co., Ltd. Power generation Korea 29.00 % 386 395 Cheongju Eco Park Co., Ltd. Power generation Korea 29.00 % 5,858 5,465 Enel X Midland Photovoltaic, LLC Power generation Korea 20.00 % 1,695 1,688 Geumsungsan Wind Power Co., Ltd. Power generation Korea 29.00 % 6,531 6,053 KEPCO KPS Carabao Corp. Utility plant maintenance Philippines 40.00 % 93 386 Prime Swedish Holding AB Holding company Sweden 45.00 % 14,514 15,441 Goheung New Energy Co., Ltd. Power generation Korea 46.15 % 12,959 11,708 Gunsan Land Solar Co., Ltd.(*20) Power generation Korea 75.29 % 19,091 19,317 CapMan Lynx SCA, SICAR Holding company Luxembourg 50.00 % 9,601 9,976 International Offshore Power Transmission Holding Company Limited Undersea transmission network operation UAE 35.00 % — — 2,069,491 2,239,011 ￦ 5,129,326 7,471,384 (*1) Due to changes in equity, the nominal and effective percentage of ownership are 20.47%. (*2) The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint directors to the board of directors of the entity, and by strict decision criteria of the Company’s financial and operating policy of the board of directors. (*3) The effective percentage of ownership is 100%. However, the Government regulates the Company’s ability to make operating and financial decisions over the entity, as the Government requires maintaining arms-length transactions between KPX and the Company’s other subsidiaries. Accordingly, the entity is not classified as a consolidated subsidiary. The Company can exercise significant influence by virtue of right to nominate directors to the board of directors of the entity. (*4) The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint one out of four members of the steering committee of the entity. Moreover, the Company has significant financial transactions, which can affect its significant influence on the entity. (*5) Although the nominal percentage of ownership is 2.35%, the effective percentage of ownership is 25.54%, considering redeemable convertible preferred stock as a liability component. (*6) The effective percentage of ownership is 34.01% considering the conversion of redeemable convertible preferred stock into ordinary stock. (*7) The effective percentage of ownership is more than 50% but the Company does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. Accordingly, the entity is classified as an associate. (*8) The effective percentage of ownership is more than 50% but the Company does not hold control over the entity according to the shareholders’ agreement. Accordingly, the entity is classified as an associate. (*9) The effective percentage of ownership is less than 20%. However, the Company considers the major decision-making body to be the general decision of the board of directors, and the general decision of the board of directors can be passed only by two directors of Namjeongsusang Solar Power Operation Co., Ltd. Accordingly, the entity is classified as an associate. (*10) According to the shareholders’ agreement, additional investment of 50% of total stake is agreed by March 2022. (*11) The effective percentage of ownership is more than 50%. However, according to the shareholders’ agreement, all critical financial and operating decisions must be agreed to by all ownership parties. Accordingly, the entities are classified as joint ventures. (*12) According to the shareholders’ agreement, the parties have joint control over all decisions related to finance and operation. Accordingly, the entity is classified as joint ventures. (*13) The joint arrangement which the Company has joint control is structured through a separate company. The parties have joint control over the joint arrangement are classified as joint ventures, judging that they have rights to the net assets of the arrangement. (*14) The effective percentage of ownership is less than 20%. However, decisions in relevant actitvities must be agreed by ownership parties. Accordingly, the entity is classified as joint ventures. (*15) Although the nominal percentage of ownership is 29%, the effective percentage of ownership is 54.24%, considering the interest of financial investors as a liability component. (*16) The effective percentage of ownership is more than 50%. However, decisions in relevant actitvities must be agreed by all ownership parties. Accordingly, the entity is classified as a joint venture. (*17) The effective percentage of ownership is less than 20%. However, according to the shareholders’ agreement, decisions related pricipal operation must be agreed by all ownership parties. Accordingly, the Company can exercise significant influence. (*18) The percentage of ownership decreased due to the unequal capital increase. The entity was reclassified from a joint venture to an associate, due to the changes in voting rights. (*19) According to the Dayone Energy Co., Ltd. Investment Agreement signed in March 2011, the Company has a commitment to guarantee principal and certain returns on shares of Dayone Energy Co., Ltd. held by NH Power 2nd Co., Ltd. and the National Agricultural Cooperative Federation. Since NH Power 2nd Co., Ltd. and the National Agricultural Cooperative Federation have put option regarding their share of the entity, the Company was deemed to have acquired an additional 15.64% stake. As a result, the effective percentage of ownership is 46.3% in the current and prior period. In accordance with shareholders’ agreement signed during the current period, the Company has joint control with other investors in making important financial and operation decisions, so it has been reclassified from an associate to a joint venture. (*20) The effective percentage of ownership is more than 50%. However, decisions in relevant actitvities must be agreed by all ownership parties. Accordingly, the entity is classified as a joint venture. 2022 Investees Key operation activities Location Percentage of Acquisition Book value In millions of won <Associates> Korea Gas Corporation Importing and wholesaling LNG KOREA 20.47 % ￦ 94,500 2,085,296 Korea Electric Power Industrial Development Co., Ltd. Electricity metering and others KOREA 29.00 % 4,727 31,078 YTN Co., Ltd.(*1) Broadcasting KOREA 21.43 % 59,000 55,027 Gangwon Wind Power Co., Ltd.(*2) Power generation KOREA 15.00 % 5,725 12,158 Hyundai Green Power Co., Ltd. Power generation equipment consignment and operation service KOREA 29.00 % 88,885 119,791 Korea Power Exchange(*3) Management of power market and others KOREA 100.00 % 127,839 275,126 Taebaek Wind Power Co., Ltd.(*29) Power generation KOREA 60.00 % 11,494 14,501 Taebaek Guinemi Wind Power Co., Ltd.(*29) Power generation KOREA 67.25 % 12,637 13,049 Daeryun Power Co., Ltd.(*2) Power generation KOREA 6.85 % 40,854 26,727 KNH Solar Co., Ltd. Power generation KOREA 27.00 % 1,296 2,883 SPC Power Corporation(*30) Power generation PHILIPPINES 38.00 % 20,635 70,868 Gemeng International Energy Co., Ltd. Power generation CHINA 34.00 % 413,153 578,821 PT. Cirebon Electric Power Power generation INDONESIA 27.50 % 40,365 135,114 KNOC Nigerian East Oil Co., Ltd.(*4) Resources development NIGERIA 14.63 % 12 — KNOC Nigerian West Oil Co., Ltd.(*4) Resources development NIGERIA 14.63 % 12 — PT Wampu Electric Power Power generation INDONESIA 46.00 % 21,292 37,743 PT. Bayan Resources TBK Resources development INDONESIA 20.00 % 615,860 684,719 S-Power Co., Ltd. Power generation KOREA 49.00 % 132,300 141,128 Pioneer Gas Power Limited Power generation INDIA 38.50 % 49,831 — Eurasia Energy Holdings Power generation and resources development RUSSIA 40.00 % 461 — Xe-Pian Xe-Namnoy Power Co., Ltd. Power generation LAOS 25.00 % 87,426 115,584 PT. Mutiara Jawa Manufacturing and operating floating coal terminal INDONESIA 29.00 % 2,978 3,597 Samcheok Eco Materials Co., Ltd.(*5) Recycling fly ashes KOREA 2.35 % 686 — Noeul Green Energy Co., Ltd. Power generation KOREA 29.00 % 1,740 — Goseong Green Power Co., Ltd. Power generation KOREA 29.00 % 262,740 288,893 Gangneung Eco Power Co., Ltd.(*2) Power generation KOREA 1.61 % 2,900 — Shin Pyeongtaek Power Co., Ltd. Power generation KOREA 40.00 % 72,000 133,823 Haeng Bok Do Si Photovoltaic Power Co., Ltd. Power generation KOREA 28.00 % 194 278 Dongducheon Dream Power Co., Ltd.(*6) Power generation KOREA 33.61 % 148,105 89,300 Jinbhuvish Power Generation Pvt. Ltd.(*2) Power generation INDIA 5.16 % 9,000 — Daejung Offshore Wind Power Co., Ltd. Power generation KOREA 46.59 % 5,190 1,555 GS Donghae Electric Power Co., Ltd. Power generation KOREA 34.00 % 204,000 260,145 Daegu Photovoltaic Co., Ltd. Power generation KOREA 29.00 % 1,230 2,849 Busan Green Energy Co., Ltd. Power generation KOREA 29.00 % 5,243 4,395 Gunsan Bio Energy Co., Ltd.(*2) Power generation KOREA 18.87 % 1,000 — Hansuwon KNP Co., Ltd. Electric material agency KOREA 28.98 % 537 280 Korea Electric Power Corporation Fund(*7) Developing electric enterprises KOREA 98.09 % 23,113 28,842 Energy Infra Asset Management Co., Ltd.(*2) Asset management KOREA 9.90 % 297 1,184 Daegu clean Energy Co., Ltd. Renewable power generation KOREA 28.00 % 140 12 YaksuESS Co., Ltd. Installing ESS related equipment KOREA 29.00 % 210 486 Nepal Water & Energy Development Company Private Limited (*8) Construction and operation of utility plant NEPAL 69.06 % 70,228 69,940 Gwangyang Green Energy Co., Ltd. Power generation KOREA 20.00 % 26,800 25,044 PND solar Co., Ltd. Power generation KOREA 29.00 % 1,250 1,403 Hyundai Eco Energy Co., Ltd.(*2) Power generation KOREA 19.00 % 3,610 7,631 YeongGwang Yaksu Wind Electric Co., Ltd.(*2) Power generation KOREA 9.63 % 533 156 Green Energy Electricity Generation Co., Ltd. Power generation KOREA 29.00 % 1,189 1,571 2022 Investees Key operation activities Location Percentage of Acquisition Book value In millions of won <Associates> Korea Energy Solutions Co., Ltd. R & D KOREA 20.00 % ￦ 300 93 ITR Co., Ltd. R & D KOREA 20.00 % 50 — Structure test network Co., Ltd. Technical testing and consulting KOREA 20.00 % 25 366 Namjeongsusang Solar Power Operation Co., Ltd.(*9) Power generation KOREA 15.00 % 969 373 Indeck Niles Development, LLC Power generation USA 50.00 % 263,825 302,038 Indeck Niles Asset Management, LLC Power generation USA 33.33 % — 94 Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 Holding company KOREA 49.00 % 6,910 6,932 Suwon New Power Co., Ltd. Power generation KOREA 39.90 % 798 919 Gwangbaek Solar Power Investment Co., Ltd. Power generation KOREA 44.00 % 4,757 5,133 Go deok Clean Energy Co., Ltd. Fuel cell generation KOREA 40.00 % 5,560 4,420 SureDataLab Co., Ltd. R & D KOREA 23.95 % 126 177 SEP Co., Ltd. R & D KOREA 21.26 % 27 — Hankook Electric Power Information Co., Ltd. (*13) R & D KOREA 16.49 % 38 220 Tronix Co., Ltd. (*13) R & D KOREA 12.50 % 75 66 O2&B Global Co., Ltd. R & D KOREA 20.00 % 25 36 Muan Sunshine Solar Power Plant Co., Ltd. Power generation KOREA 20.00 % 1,570 2,562 Bigeum Resident Photovoltaic Power Co., Ltd. Power generation KOREA 29.90 % 1 — Goesan Solar Park Co., Ltd. Power generation KOREA 29.00 % 1,276 2,591 Saemangeum Heemang Photovoltaic Co., Ltd. Power generation KOREA 35.00 % 11,022 13,010 Bitgoel Eco Energy Co., Ltd. Power generation KOREA 49.25 % 7,880 8,951 Jeju Gimnyeong Wind Power Co., Ltd. Power generation KOREA 30.00 % 714 872 Seoroseoro Sunny Power Plant Co., Ltd. Power generation KOREA 42.58 % 706 859 Muan Solar park Co., Ltd. Power generation KOREA 20.00 % 4,400 7,838 YuDang Solar Co., Ltd. Power generation KOREA 20.00 % 360 586 Anjwa Smart Farm & Solar City Co., Ltd. Power generation KOREA 20.00 % 5,651 8,662 Daewon Green Energy Co., Ltd. Power generation KOREA 25.36 % 3,910 4,485 G.GURU Co., Ltd. R & D KOREA 24.65 % 493 300 UD4M Co., Ltd.(*10) R & D KOREA 12.50 % 75 161 Dongbu Highway Solar Co., Ltd. Power generation KOREA 20.00 % 190 352 Seobu Highway Solar Co., Ltd. Power generation KOREA 20.00 % 195 316 Korea Energy Data Co., Ltd. R & D KOREA 29.37 % 60 62 Gangneung Sacheon Fuel Cell Co., Ltd. Power generation KOREA 41.00 % 5,695 4,277 KOSTURE Co., Ltd.(*2) Coal recycling business KOREA 0.82 % 1 1 Taebaek Gadeoksan Wind Power Co., Ltd. Power generation KOREA 34.00 % 12,570 20,040 Chuncheon Green Energy Co., Ltd. Power generation KOREA 45.00 % 9,540 9,155 Yeomsubong Wind Power Co., Ltd. (*11) Power generation KOREA 3.81 % 95 62 Yeongyang Wind Power Corporation II Power generation KOREA 30.00 % 7,965 7,461 Haeparang Energy Co., Ltd. Power generation KOREA 25.00 % 2,241 2,188 Saemangeum Sebit Power Plant Co., Ltd.(*12) Power generation KOREA 63.33 % 13,788 23,199 Boulder Solar III, LLC Power generation USA 30.00 % 715 744 PlatformN. Co., Ltd. R & D KOREA 29.58 % 105 84 PT. Cirebon Energi Prasarana (*9) Power generation INDONESIA 10.00 % 26,710 69,035 Green Radiation Co., Ltd. (*13) R & D KOREA 10.00 % 20 11 Future Convergence Technology Laboratory. Co., Ltd. R & D KOREA 20.12 % 76 50 SC E&G. Co,. Ltd. R & D KOREA 20.00 % 90 214 Wang San Engineering. Co,. Ltd. R & D KOREA 20.00 % 81 166 ACE R & D KOREA 20.00 % 20 20 Environment and Energy Co., Ltd. (*13) R & D KOREA 10.54 % 11 10 Santiago Solar Power SpA Power generation CHILE 50.00 % 13,851 13,373 Yanggu Floating Photovoltaic Power Plant Inc. Power generation KOREA 29.00 % 904 903 3,089,683 5,844,464 2022 Investees Key operation activities Location Percentage of Acquisition Book value In millions of won <Joint ventures> KEPCO-Uhde Inc.(*14) Power generation KOREA 52.80 % ￦ 11,355 17 Shuweihat Asia Power Investment B.V. Holding company NETHERLANDS 49.00 % 44,405 66,452 Shuweihat Asia Operation & Maintenance Company(*14) Maintenance of utility plant CAYMAN 55.00 % 30 1,631 Waterbury Lake Uranium L.P. (*15) Resources development CANADA 32.59 % 26,602 21,750 ASM-BG Investicii AD Power generation BULGARIA 50.00 % 9,846 14,555 RES Technology AD Power generation BULGARIA 50.00 % 11,922 15,133 KV Holdings, Inc. (*30) Power generation PHILIPPINES 40.00 % 2,103 9,659 KEPCO SPC Power Corporation(*14,30) Construction and operation of utility plant PHILIPPINES 75.20 % 94,579 179,594 Gansu Datang Yumen Wind Power Co., Ltd. Power generation CHINA 40.00 % 16,621 6,024 Datang Chifeng Renewable Power Co., Ltd. Power generation CHINA 40.00 % 121,928 191,982 Datang KEPCO Chaoyang Renewable Power Co., Ltd. Power generation CHINA 40.00 % 39,872 44,398 Rabigh Electricity Company Power generation SAUDI ARABIA 40.00 % 109,743 214,607 Rabigh Operation & Maintenance Company Limited Maintenance of utility plant SAUDI ARABIA 40.00 % 70 5,113 Jamaica Public Service Company Limited Power generation JAMAICA 40.00 % 301,910 331,407 KW Nuclear Components Co., Ltd. Manufacturing KOREA 45.00 % 833 17,090 Busan Shinho Solar Power Co., Ltd. Power generation KOREA 25.00 % 2,100 6,719 Global Trade Of Power System Co., Ltd.(*16) Exporting products and technology of small or medium business by proxy KOREA 29.00 % 290 698 Expressway Solar-light Power Generation Co., Ltd.(*17) Power generation KOREA 50.00 % 1,856 4,754 Amman Asia Electric Power Company(*14) Power generation JORDAN 60.00 % 111,476 220,254 KAPES, Inc.(*14) R & D KOREA 51.00 % 5,629 — Honam Wind Power Co., Ltd. Power generation KOREA 29.00 % 3,480 4,819 Korea Power Engineering Service Co., Ltd. Construction and service KOREA 29.00 % 290 5,543 Chun-cheon Energy Co., Ltd. Power generation KOREA 29.90 % 52,700 32,044 Yeonggwangbaeksu Wind Power Co., Ltd.(*16) Power generation KOREA 15.00 % 3,000 3,151 Nghi Son 2 Power LLC Power generation VIETNAM 50.00 % 175,261 408,839 Kelar S.A.(*14) Power generation CHILE 65.00 % 78,060 117,137 PT. Tanjung Power Indonesia Power generation INDONESIA 35.00 % 57,039 92,907 Incheon New Power Co., Ltd.(*18) Power generation KOREA 29.00 % 461 198 Seokmun Energy Co., Ltd. Power generation KOREA 29.00 % 15,370 17,336 Daehan Wind Power PSC Power generation JORDAN 50.00 % 7,493 13,923 Barakah One Company(*19) Power generation UAE 18.00 % 118 — Nawah Energy Company(*19) Operation of utility plant UAE 18.00 % 296 315 Momentum International thermonuclear experimental reactor construction management FRANCE 33.33 % 1 345 Daegu Green Power Co., Ltd.(*20) Power generation KOREA 29.00 % 46,225 29,360 Yeonggwang Wind Power Co., Ltd. Power generation KOREA 46.00 % 17,475 20,713 Chester Solar IV SpA Power generation CHILE 45.00 % 1,700 181 Chester Solar V SpA Power generation CHILE 45.00 % 525 156 Diego de Almagro Solar SpA Power generation CHILE 45.00 % 2,091 540 South Jamaica Power Company Limited Power generation JAMAICA 20.00 % 20,430 46,437 Daesan Green Energy Co., Ltd. Power generation KOREA 35.00 % 17,850 19,218 RE Holiday Holdings LLC Power generation USA 50.00 % 42,948 85,370 RE Pioneer Holdings LLC Power generation USA 50.00 % 27,891 55,172 RE Barren Ridge 1 Holdings LLC Power generation USA 50.00 % 28,021 3,350 RE Astoria 2 LandCo LLC Power generation USA 50.00 % 5,188 6,599 RE Barren Ridge LandCo LLC Power generation USA 50.00 % 2,187 2,333 Laurel SpA Power generation CHILE 45.00 % 1,222 554 KIAMCO KOWEPO Bannerton Hold Co Pty Ltd(*16) Power generation AUSTRALIA 12.37 % 4,095 3,651 Chile Solar JV SpA Power generation CHILE 50.00 % 12,674 9,819 Cheong-Song Noraesan Wind Power Co., Ltd.(*15) Power generation KOREA 29.01 % 3,200 4,263 Chester Solar I SpA Power generation CHILE 45.00 % 1,181 1,314 Solar Philippines Calatagan Corporation Power generation PHILIPPINES 38.00 % 47,903 56,902 Saemangeum Solar Power Co., Ltd.(*21) Power generation KOREA 81.01 % 26,400 23,551 Chungsongmeon BongSan wind power Co., Ltd.(*16) Power generation KOREA 29.00 % 2,900 3,470 2022 Investees Key operation activities Location Percentage of Acquisition Book value In millions of won <Joint ventures> Jaeun Resident Wind Power Plant Co., Ltd.(*16) Power generation KOREA 29.00 % ￦ 2,494 2,236 DE Energia SpA Power generation CHILE 49.00 % 8,364 9,536 Dangjin Eco Power Co., Ltd. Power generation KOREA 34.00 % 25,661 26,859 Haemodum Solar Co., Ltd. Power generation KOREA 49.00 % 2,940 3,367 Yangyang Wind Power Co., Ltd. Power generation KOREA 50.00 % 12,000 10,864 HORUS SOLAR, S.A. DE C.V. (*22) Renewable power generation MEXICO 14.95 % 5,068 6,976 RECURSOS SOLARES PV DE MEXICO II, S.A. DE C.V. (*22) Renewable pow

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2022
Disclosure of detailed information about property, plant and equipment [abstract]
Property, Plant and Equipment	18. Property, Plant and Equipment (1) Property, plant and equipment as of December 31, 2021 and 2022 are as follows: 2021 Acquisition cost Government grants Accumulated depreciation Accumulated losses Book value In millions of won Land ￦ 14,135,452 (23,474 ) — (27,487 ) 14,084,491 Buildings 22,974,569 (52,122 ) (10,041,270 ) (7,073 ) 12,874,104 Structures 78,474,620 (172,021 ) (30,171,363 ) (13,205 ) 48,118,031 Machinery 101,062,220 (140,082 ) (48,791,847 ) (514,991 ) 51,615,300 Ships 2,068 — (1,891 ) — 177 Vehicles 371,207 (1,675 ) (281,833 ) (117 ) 87,582 Equipment 1,989,115 (149 ) (1,591,890 ) (42 ) 397,034 Tools 1,256,189 (64 ) (1,073,086 ) (38 ) 183,001 Construction-in-progress 30,313,624 (111,822 ) — (157,530 ) 30,044,272 Right-of-use 7,848,138 — (3,788,741 ) — 4,059,397 Asset retirement costs 14,348,920 — (5,277,109 ) (146,423 ) 8,925,388 Others 14,852,245 — (12,106,384 ) — 2,745,861 ￦ 287,628,367 (501,409 ) (113,125,414 ) (866,906 ) 173,134,638 2022 Acquisition cost Government grants Accumulated depreciation Accumulated losses Book value In millions of won Land ￦ 14,298,409 (27,405 ) — (27,472 ) 14,243,532 Buildings 24,230,827 (50,437 ) (10,931,672 ) (6,955 ) 13,241,763 Structures 83,055,890 (165,608 ) (32,596,265 ) (10,390 ) 50,283,627 Machinery 108,749,243 (127,126) (54,015,594 ) (541,864 ) 54,064,659 Ships 17,264 — (3,788 ) — 13,476 Vehicles 393,046 (2,045 ) (305,242 ) (117 ) 85,642 Equipment 2,168,348 (6,608 ) (1,732,564 ) (43 ) 429,133 Tools 1,306,509 (99 ) (1,128,002 ) (6 ) 178,402 Construction-in-progress 28,064,266 (135,926 ) — (22,795 ) 27,905,545 Right-of-use 5,992,724 — (2,281,599 ) — 3,711,125 Asset retirement costs 17,620,603 — (6,185,214 ) (146,422 ) 11,288,967 Others 15,520,160 — (13,100,723 ) — 2,419,437 ￦ 301,417,289 (515,254) (122,280,663 ) (756,064) 177,865,308 (2) Changes in property, plant and equipment for the years ended December 31, 2021 and 2022 are as follows: 2021 Beginning Acquisition Disposal Depreciation Impairment Others Ending balance In millions of won Land ￦ 13,943,326 9,561 (54,447 ) — — 209,525 14,107,965 (Government grants) (23,475 ) — 1 — — — (23,474 ) Buildings 12,616,532 9,036 (19,974 ) (889,539 ) — 1,210,171 12,926,226 (Government grants) (57,231 ) — — 5,174 — (65 ) (52,122 ) Structures 46,258,855 630 (319,287 ) (2,582,488 ) (741 ) 4,933,083 48,290,052 (Government grants) (180,009 ) — 1,811 9,517 — (3,340 ) (172,021 ) Machinery 50,038,787 268,126 (135,803 ) (5,759,425 ) — 7,343,697 51,755,382 (Government grants) (157,785 ) — 531 17,519 — (347 ) (140,082 ) Ships 255 — — (103 ) — 25 177 Vehicles 78,983 4,807 (4,298 ) (37,980 ) — 47,745 89,257 (Government grants) (632 ) (26 ) — 460 — (1,477 ) (1,675 ) Equipment 407,843 54,875 (667 ) (184,007 ) — 119,139 397,183 (Government grants) (227 ) — — 95 — (17 ) (149 ) Tools 192,387 19,389 (89 ) (81,984 ) — 53,362 183,065 (Government grants) (239 ) — — 209 — (34 ) (64 ) Construction-in-progress 30,964,938 12,183,430 (66,965 ) — (3,315 ) (12,921,994 ) 30,156,094 (Government grants) (79,126 ) 5,027 — — — (37,723 ) (111,822 ) Right-of-use 4,542,166 78,213 (11,787 ) (558,565 ) — 9,370 4,059,397 Asset retirement costs 7,413,171 92 (209 ) (844,518 ) — 2,356,852 8,925,388 Others 2,752,081 5,311 (2,332 ) (869,310 ) — 860,111 2,745,861 ￦ 168,710,600 12,638,471 (613,515 ) (11,774,945 ) (4,056 ) 4,178,083 173,134,638 2022 Beginning Acquisition Disposal Depreciation Impairment Others Ending balance In millions of won Land ￦ 14,107,965 9,535 (49,377 ) — — 202,814 14,270,937 (Government grants) (23,474 ) — 1 — — (3,932 ) (27,405 ) Buildings 12,926,226 3,202 (19,918 ) (906,528 ) (449 ) 1,289,667 13,292,200 (Government grants) (52,122 ) — — 5,360 — (3,675 ) (50,437 ) Structures 48,290,052 217,450 (277,308 ) (2,677,395 ) (3,669 ) 4,900,105 50,449,235 (Government grants) (172,021 ) — 1,250 9,568 — (4,405 ) (165,608 ) Machinery 51,755,382 248,932 (188,924 ) (5,748,407 ) (33,191 ) 8,157,993 54,191,785 (Government grants) (140,082 ) — 405 17,283 — (4,732 ) (127,126 ) Ships 177 — — (1,053 ) — 14,352 13,476 Vehicles 89,257 1,813 (88 ) (41,907 ) — 38,612 87,687 (Government grants) (1,675 ) — — 663 — (1,033 ) (2,045 ) Equipment 397,183 79,369 (183 ) (205,908 ) (1 ) 165,281 435,741 (Government grants) (149 ) — — 494 — (6,953 ) (6,608 ) Tools 183,065 25,291 (180 ) (77,902 ) — 48,227 178,501 (Government grants) (64 ) — — 32 — (67 ) (99 ) Construction-in-progress 30,156,094 11,671,907 (197,293 ) — 134,735 (13,723,972 ) 28,041,471 (Government grants) (111,822 ) 23,155 17 — — (47,276 ) (135,926 ) Right-of-use 4,059,397 197,016 (2,838 ) (509,068 ) — (33,382 ) 3,711,125 Asset retirement costs 8,925,388 — — (1,133,866 ) — 3,497,445 11,288,967 Others 2,745,861 9,028 (22,531 ) (1,036,132 ) — 723,211 2,419,437 ￦ 173,134,638 12,486,698 (756,967) (12,304,766) 97,425 5,208,280 177,865,308 (3) The Company’s subsidiaries including Korea Hydro & Nuclear Power Co., Ltd. have recognized proceeds and costs from selling items produced before its intended use, by accounting ￦94,264 million as revenue and ￦63,405 as expense in profit or loss for the year ended December 31, 2022.

Investment Properties

Investment Properties	12 Months Ended
	Dec. 31, 2022
Disclosure of detailed information about investment property [abstract]
Investment Properties	19. Investment Properties (1) Investment properties as of December 31, 2021 and 2022 are as follows: 2021 Acquisition Government Accumulated Book value In millions of won Land ￦ 201,605 — — 201,605 Buildings 19,543 (30 ) (8,334 ) 11,179 ￦ 221,148 (30 ) (8,334 ) 212,784 2022 Acquisition Government Accumulated Book value In millions of won Land ￦ 194,417 — — 194,417 Buildings 20,241 (21 ) (6,351 ) 13,869 ￦ 214,658 (21 ) (6,351 ) 208,286 (2) Changes in investment properties for the years ended December 31, 2021 and 2022 are as follows: 2021 Beginning Depreciation Others Ending In millions of won Land ￦ 200,391 — 1,214 201,605 Buildings 24,833 (1,387 ) (12,237 ) 11,209 (Government grants) (29 ) 1 (2 ) (30 ) ￦ 225,195 (1,386 ) (11,025 ) 212,784 2022 Beginning Disposal Depreciation Others Ending In millions of won Land ￦ 201,605 (208 ) — (6,980 ) 194,417 Buildings 11,209 — (487 ) 3,168 13,890 (Government grants) (30 ) — 1 8 (21 ) ￦ 212,784 (208 ) (486 ) (3,804 ) 208,286 (3) Income and expenses related to investment properties for the years ended December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Rental income ￦ 10,118 9,775 Operating and maintenance expenses related to rental income (1,386 ) (587 ) ￦ 8,732 9,188 (4) Fair value of investment properties as of December 31, 2021 and 2022 are as follows: 2021 2022 Book value Fair value Book value Fair value In millions of won Land ￦ 201,605 268,702 194,417 292,827 Buildings 11,179 13,636 13,869 15,626 ￦ 212,784 282,338 208,286 308,453 The Company determined the fair value of investment property on the transition date based on valuations conducted by an independent valuation firm that is independent of the Company. The valuation firm has appropriate qualifications and experience in the valuation of real estate in the Republic of Korea, and the valuation was conducted using a comparison method, which is a method of obtaining economic value based on the marketability of the property. The fair values of the investment properties as of the reporting date were determined in consideration of the fluctuation on the publicly announced individual land price after the IFRS transition date (January 1, 2010). (5) All of the Company’s investment properties are held under freehold interests.

Construction Contracts

Construction Contracts	12 Months Ended
	Dec. 31, 2022
Construction Contracts [Abstract]
Construction Contracts	20. Construction Contracts (1) Changes in total contract amount in which revenue is not yet recognized for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 Beginning balance Increase Recognized as revenue Ending In millions of won Nuclear power plant construction in UAE and others ￦ 2,735,141 1,229,759 (812,175 ) 3,152,725 (*) For the year ended December 31, 2020, the increased balance of contracts from new orders is ￦1,512,460 million and the decreased balance of contracts due to changes in scope of construction work and foreign exchange impact is ￦282,701 million. 2021 Beginning balance Increase Recognized as revenue Ending In millions of won Nuclear power plant construction in UAE and others ￦ 3,152,725 386,208 (754,998 ) 2,783,935 (*) For the year ended December 31, 2021, the increased balance of contracts from new orders is ￦458,635 million and the decreased balance of contracts due to changes in scope of construction work and foreign exchange impact is ￦72,427 million. 2022 Beginning balance Increase Recognized as revenue Ending In millions of won Nuclear power plant construction in overseas ￦ 2,783,935 3,457,964 (646,953 ) 5,594,946 (*) For the year ended December 31, 2022, the increased balance of contracts from new orders is ￦3,578,599 million and the decreased balance of contracts due to changes in scope of construction work and foreign exchange impact is ￦81,401 million. (2) Accumulated earned revenue, expense and others related to the Company’s construction contracts in progress as of December 31, 2021 and 2022 are as follows: 2021 Accumulated earned revenue Accumulated expense Accumulated profit Unearned advance receipts In millions of won Nuclear power plant construction in UAE and others ￦ 22,051,129 20,967,097 1,084,032 23,238 2022 Accumulated earned revenue Accumulated expense Accumulated profit Unearned advance receipts In millions of won Nuclear power plant construction in overseas and others ￦ 22,507,004 21,666,552 840,452 29,877 (3) Gross amount due from customers recognized as contract assets and due to customers recognized as contract liabilities for contract work as of December 31, 2021 and 2022 are as follows: 2021 2022 Contract Contract Contract Contract In millions of won Nuclear power plant construction in overseas and others ￦ 82,306 5,330 118,983 120,952 (*1) Included in trade and other receivables, net, in the consolidated statements of financial position. The balance of trade receivables from construction contracts are ￦57,639 million and ￦85,757 million, as of December 31, 2021 and 2022, respectively. (*2) Included in non-financial Revenue recognized for the year ended December 31, 2022 from performance obligations satisfied in previous periods is ￦15,663 million.

Intangible Assets other than Go

Intangible Assets other than Goodwill	12 Months Ended
	Dec. 31, 2022
Disclosure of detailed information about intangible assets [abstract]
Intangible Assets other than Goodwill	21. Intangible Assets other than Goodwill (1) Intangible assets as of December 31, 2021 and 2022 are as follows: 2021 Acquisition Government Accumulated Accumulated Book value In millions of won Software ￦ 867,185 (91 ) (704,589 ) — 162,505 Copyrights, patents rights and other industrial rights 103,428 — (59,063 ) (9,178 ) 35,187 Mining rights 623,122 — (39,803 ) (541,417 ) 41,902 Development expenditures 978,768 (3,820 ) (905,805 ) (19 ) 69,124 Intangible assets under development 94,275 (7,326 ) — (12,845 ) 74,104 Usage rights of donated assets and others 592,870 — (423,087 ) — 169,783 Leasehold rights 28,185 — (22,337 ) — 5,848 Greenhouse gas emissions rights 78,137 — — — 78,137 Others 574,957 (71 ) (155,404 ) (11,995 ) 407,487 ￦ 3,940,927 (11,308 ) (2,310,088 ) (575,454 ) 1,044,077 2022 Acquisition Government Accumulated Accumulated Book value In millions of won Software ￦ 1,002,040 (174 ) (799,013 ) (20 ) 202,833 Copyrights, patents rights and other industrial rights 104,559 — (67,368 ) (9,178 ) 28,013 Mining rights 625,845 — (46,187 ) (541,133 ) 38,525 Development expenditures 938,032 (3,477 ) (883,527 ) — 51,028 Intangible assets under development 76,625 (2,108 ) — (8,903 ) 65,614 Usage rights of donated assets and others 592,797 — (435,518 ) (136 ) 157,143 Leasehold rights 28,185 — (23,297 ) — 4,888 Greenhouse gas emissions rights 43,960 — — — 43,960 Others 551,396 (67 ) (174,714 ) (11,955 ) 364,660 ￦ 3,963,439 (5,826 ) (2,429,624 ) (571,325 ) 956,664 (2) Changes in intangible assets for the years ended December 31, 2021 and 2022 are as follows: 2021 Beginning Acquisition Disposal Amortization Reversal Others Ending In millions of won Software ￦ 152,163 18,834 (1 ) (77,881 ) — 69,481 162,596 (Government grants) (136 ) — — 64 — (19 ) (91 ) Copyrights, patents rights and other industrial rights 42,916 166 (131 ) (7,771 ) — 7 35,187 Mining rights 42,390 1,022 — (3,526 ) — 2,016 41,902 Development expenditures 95,166 309 — (37,033 ) — 14,502 72,944 (Government grants) (5,043 ) — — 1,439 — (216 ) (3,820 ) Intangible assets under development 67,018 51,988 — — — (37,576 ) 81,430 (Government grants) (7,203 ) — — — — (123 ) (7,326 ) Usage rights of donated assets and others 184,475 — — (13,594 ) — (1,098 ) 169,783 Leasehold rights 6,340 — — (834 ) — 342 5,848 Greenhouse gas emissions rights 61,373 78,091 — (31 ) — (61,296 ) 78,137 Others 416,346 2,229 — (26,998 ) 14 15,967 407,558 (Government grants) (75 ) — — 4 — — (71 ) ￦ 1,055,730 152,639 (132 ) (166,161 ) 14 1,987 1,044,077 2022 Beginning Acquisition Disposal Amortization Impairment Others Ending In millions of won Software ￦ 162,596 22,532 (57 ) (84,649 ) — 102,585 203,007 (Government grants) (91 ) — — 60 — (143 ) (174 ) Copyrights, patents rights and other industrial rights 35,187 270 (37 ) (7,136 ) — (271 ) 28,013 Mining rights 41,902 2,395 — (4,296 ) — (1,476 ) 38,525 Development expenditures 72,944 — — (24,238 ) — 5,799 54,505 (Government grants) (3,820 ) — — 1,466 — (1,123 ) (3,477 ) Intangible assets under development 81,430 39,559 — — (14 ) (53,253 ) 67,722 (Government grants) (7,326 ) — — — — 5,218 (2,108 ) Usage rights of donated assets and others 169,783 — — (11,394 ) (150 ) (1,096 ) 157,143 Leasehold rights 5,848 — — (960 ) — — 4,888 Greenhouse gas emissions rights 78,137 57,466 — — — (91,643 ) 43,960 Others 407,558 4,073 (260 ) (25,017 ) — (21,627 ) 364,727 (Government grants) (71 ) — — 4 — — (67 ) ￦ 1,044,077 126,295 (354 ) (156,160 ) (164 ) (57,030 ) 956,664 (3) Significant specific intangible assets as of December 31, 2021 and 2022 are as follows: 2021 Type Description Currency Amount Remaining useful lives In millions of won and thousands of Australian dollars Software DAS MS-SQL KRW 3,817 2 years and 8 months Copyrights, patents rights and other industrial rights Smart technology verification and standard design project conducting right KRW 1,851 9 months Contributions to AP R KRW 25,045 6 years Mining rights Mining rights of Bylong mine AUD — — (*) Usage rights of donated assets and others Sejong Haengbogdosi sharing charge KRW 22,310 4 years and 11 months Right of use electricity and gas supply facility (Community district of Songdo) KRW 8,962 8 years and 6 months Others Occupancy and use of public waters KRW 81,623 15 years and 1 month Greenhouse gas emissions rights KRW 78,137 — Business rights KRW 160,459 27 years and 11 months (*)   The carrying amount of mining rights is nil, because KEPCO Australia Pty., Ltd. and KEPCO Bylong Australia Pty., Ltd. had recognized impairment losses in full. 2022 Type Description Currency Amount Remaining useful lives In millions of won and thousands of Australian dollars Software ORACLE license for SDIS integrated DB KRW 5,509 3 years and 4 months Copyrights, patents rights and other industrial rights Contributions to APR NRC DC KRW 20,871 5 years Mining rights Mining rights of Bylong mine AUD — — (*) Usage rights of donated assets and others Sejong Haengbogdosi sharing charge KRW 17,772 3 years and 11 months Right of use electricity and gas supply facility (Community district of Songdo) KRW 7,908 7 years and 6 months Others Occupancy and use of public waters KRW 76,212 14 years and 1 month Greenhouse gas emissions rights KRW 43,960 — Business rights KRW 154,712 26 years and 11 months (*) The carrying amount of mining rights is nil, because KEPCO Australia Pty., Ltd. and KEPCO Bylong Australia Pty., Ltd. had recognized impairment losses in full. (4) For the years ended December 31, 2020, 2021 and 2022, the Company recognized research and development expenses of 700,642 million, 689,397 million and 727,810

Trade and Other Payables

Trade and Other Payables	12 Months Ended
	Dec. 31, 2022
Trade and other payables [abstract]
Trade and Other Payables	22. Trade and Other Payables Trade and other payables as of December 31, 2021 and 2022 are as follows: 2021 2022 Current Non-current Current Non-current In millions of won Trade payables ￦ 4,780,260 — 7,529,857 — Non-trade 1,536,976 2,032,260 2,132,838 2,023,985 Accrued expenses 1,174,765 8,095 1,605,118 6,351 Leasehold deposits received 1,699 741 2,479 35 Other deposits received 72,063 68,050 97,408 47,863 Lease liabilities 583,558 3,826,945 614,037 3,549,106 Dividends payable 4,105 — 1,812 — Others(*) — 60,407 — 11,574 ￦ 8,153,426 5,996,498 11,983,549 5,638,914 (*) Details of others as of December 31, 2021 and 2022 are as follows: 2021 2022 Current Non-current Current Non-current In millions of won Advance received from local governments ￦ — 3,477 — 3,477 Others — 56,930 — 8,097 ￦ — 60,407 — 11,574

Borrowings and Debt Securities

Borrowings and Debt Securities	12 Months Ended
	Dec. 31, 2022
Disclosure of detailed information about borrowings [abstract]
Borrowings and Debt Securities	23. Borrowings and Debt Securities (1) Borrowings and debt securities as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Current liabilities Short-term borrowings ￦ 2,920,563 8,820,425 Current portion of long-term borrowings 1,463,703 3,638,202 Current portion of debt securities 9,652,986 10,205,395 Less : Current portion of discount on long-term borrowings (2,048 ) (774 ) Less : Current portion of discount on debt securities (5,370 ) (4,246 ) 14,029,834 22,659,002 Non-current Long-term borrowings 2,278,481 2,977,268 Debt securities 64,385,784 95,160,920 Less : Discount on long-term borrowings (12,857 ) (14,945 ) Less : Discount on debt securities (152,760 ) (177,543 ) Add: Premium on debt securities 1,031 663 66,499,679 97,946,363 ￦ 80,529,513 120,605,365 (2) Repayment schedule of borrowings and debt securities as of December 31, 2021 and 2022 are as follows: 2021 Type Borrowings Debt Securities In millions of won Less than 1 year ￦ 4,384,266 9,652,986 1~ 5 years 1,013,500 34,156,038 Over 5 years 1,264,981 30,229,746 ￦ 6,662,747 74,038,770 2022 Type Borrowings Debt Securities In millions of won Less than 1 year ￦ 12,458,627 10,205,395 1~ 5 years 1,472,655 65,278,587 Over 5 years 1,504,613 29,882,333 ￦ 15,435,895 105,366,315 (3) Short-term borrowings as of December 31, 2021 and 2022 are as follows: 2021 Type Creditor Interest rate (%) Maturity Foreign currency Local currency In millions of won and thousands of foreign currencies Local short-term borrowings DB financial investment and others 1.96~4.60 2022.01.07 ~2022.12.31 — ￦ 2,030,886 Electronic short-term bonds BNK Securities and others 1.35~1.77 2022.01.21 ~2022.02.08 — 100,000 Foreign short-term borrowings Shinhan Bank and others 0.34~0.45 2022.01.04 ~2022.03.30 USD 157,533 186,755 Foreign short-term borrowings Korea Development Bank and others 1M Libor + 1.25 2022.04.29 USD 173,042 205,142 Foreign short-term borrowings Shinhan Bank and others 0.57~0.80 2022.06.17 ~2022.08.31 USD 78,319 92,847 Foreign short-term borrowings Credit Agricole and others 0.04 2022.06.28 EUR 72,199 96,915 Local bank overdraft Korea Development Bank and others 1.73~2.25 2022.01.07 ~2022.02.26 — 208,018 ￦ 2,920,563 2022 Type Creditor Interest rate (%) Maturity Foreign currency Local currency In millions of won and thousands of USD Local short-term borrowings DB financial investment and others 3.21~5.80 2023.01.02 ~2023.12.31 — ￦ 5,549,120 Local short-term borrowings Nonghyup Bank and others 3M CD + 1.11~1.70 2023.05.25 ~2023.11.24 — 3,000,000 Local short-term borrowings Shinhan Bank 6M Bank 2023.11.17 — 50,000 Local short-term borrowings Korea Development Bank 4.15 2023.01.06 — 3,400 Foreign short-term borrowings Shinhan Bank 5.19 2023.02.28 USD 12,045 15,264 Foreign short-term borrowings Shinhan Bank SOFR(1M) + 0.65 2023.02.27 USD 40,000 50,692 Foreign short-term borrowings Kookmin Bank and others 3.32~5.88 2023.01.09 ~2023.06.12 USD 91,796 116,333 Local bank overdraft Woori Bank and others Standard overdraft 4.83 2023.01.06 ~2023.02.24 — 35,616 ￦ 8,820,425 (4) Long-term borrowings as of December 31, 2021 and 2022 are as follows: 2021 Type Interest rate (%) Maturity Foreign currency Local currency In millions of won and thousands of foreign currencies Local long-term borrowings Korea Development Bank Others 0.50 2023~2044 — ￦ 2,509 Facility 2.50~4.60 2022~2028 — 39,430 Operating funds 2.33 2022 — 20,000 Operating funds 1yr KDB bond rate + 0.81~0.95 2022~2023 — 64,300 Hana Bank Commercial Paper 3M CD+0.13~0.43 2022~2025 — 1,050,000 Facility 4.60 2028 — 9,647 Facility 3yr KTB rate-1.25 2022~2028 — 4,485 IBK PF Refinancing CD+1.25 2030 — 8,589 Export-Import Bank of Korea Project loans 1.50 2026 — 13,258 Facility 1.32 2028 — 32,000 Operating funds 1.78 2023 — 15,700 Korea Energy Agency Development of power resources 3yr KTB rate-2.25 2023~2025 — 8,971 Facility 3yr KTB rate-2.25 2022~2024 — 995 Project loans — 2023 — 1,197 Others 1.75 2028 — 4,893 Shinhan Bank and others Facility CB rate+1.10 2028 — 14,470 Commercial Paper 3M CD+0.38 2025 — 150,000 Others 3.95 2034 — 84,179 Others Standard overdraft rate+1.00 2034 — 84,179 Kookmin Bank Facility MOR+0.79 3M CD+1.79 2022~2031 — 59,333 Others Facility 2.80~6.80 2024~2039 — 620,185 Facility CB rate+0.90~1.10 3M CD+1.60 3.37 2028~2037 — 171,733 PF Refinancing 3.80~5.00 2030~2034 — 71,742 PF Refinancing 1.75 2029 — 22,265 Others 4.40~7.90 2022~2038 — 116,367 Others 1.80~4.50 2031~2034 — 49,928 2,720,355 Foreign long-term borrowings Korea Energy Agency Project loans — 2026 USD 8,744 10,366 Export-Import Bank of Korea and others Direct loan and others 1M Libor+1.80~3.20 2036 USD 89,823 106,485 Direct loan and others 3M Libor+2.75~3.70 2027 JOD 107,868 180,363 PF Loan 6M Libor+1.70~2.50 2032 USD 103,340 122,509 POSCO and others Shareholder’s loan 8.00 2025 USD 11,953 14,171 Shareholder’s loan 8.00 2031 JOD 4,853 8,114 Samsung Life Insurance and others Syndicated Loan 3.10~8.00 2032 JPY 5,144,387 53,000 Woori Bank and others Syndicated Loan JPY 6M Libor+2.00 2032 JPY 2,820,708 29,060 KiwoomSolar Power Professional Investor Private Placement Investment Trust V Senior borrowing 3.90 2029 EUR 36,311 48,741 IFC and others Others 6M Libor+5.00 2031 USD 230,018 272,686 Federal Financing Bank and others PF Loan 2.39~6.00 2031~2038 USD 94,135 111,597 Others Others — — USD 54,607 64,737 1,021,829 3,742,184 Less: Discount on long-term borrowings (14,905 ) Less: Current portion of long-term borrowings (1,463,703 ) Add: Current portion of discount on long-term borrowings 2,048 ￦ 2,265,624 2022 Type Interest rate (%) Maturity Foreign currency Local currency In millions of won and thousands of foreign currencies Local long-term borrowings Korea Development Bank Others 0.50 2023~2044 — ￦ 2,133 Facility 2.50~4.60 2023~2028 — 28,420 Facility CB rate+0.90 2029 — 9,985 Operating funds 1yr KDB rate+0.81~0.91 2023~2024 — 54,300 Hana Bank and others Commercial Paper 3M CD+0.13~1.20 2023~2027 — 3,250,000 Facility 4.60 2028 — 8,137 Facility 3yr KTB rate-1.50 2028 — 3,821 Export-Import Bank of Korea Project loans 1.50 2026 — 10,312 Facility 1.32 2028 — 58,100 Operating funds 1.78 2023 — 15,700 Korea Energy Agency Development of power resources 3yr KTB rate-2.25 1.50~1.75 2023~2028 — 11,175 Facility 3yr KTB rate-2.50 2023~2024 — 393 Project loans — 2023~2027 — 1,197 Shinhan Bank and others Facility CB rate+0.90~1.10 2028~2029 — 19,195 Commercial Paper 3M CD+0.38 2025 — 150,000 Others 3.95 2034 — 78,905 Others Standard overdraft rate+1.00 2034 — 78,905 Kookmin Bank Facility MOR+0.79 2023~2035 — 105,155 Others 4.00 2025 — 20,700 Woori Bank Facility 3M Libor+1.90 5.04 2035~2042 — 48,823 Others Facility 3.50~6.80 2028~2044 — 690,259 Facility CB rate+1.10 1.75~4.56 2024~2036 — 103,131 PF Refinancing CB rate+1.25 2030 — 7,634 PF Refinancing 4.10 2030 — 21,206 Securitized debts (*) 3M CD+1.80 2025 — 33,476 Others 4.40~7.90 2023~2039 — 120,217 Others 1.80~4.50 2031~2034 — 49,929 4,981,208 Foreign long-term borrowings Korea Energy Agency Project loans — 2026 USD 8,744 11,081 Export-Import Bank of Korea and others Direct Loan and others 6M Libor+3.20 2036 USD 78.094 98,969 Direct Loan and others 3M Libor+2.25~3.70 2027 JOD 91,051 162,692 Facility 6M Libor+1.70~2.50 SOFR(3M) +1.83 2039~2032 USD 132,168 167,496 Kookmin Bank and others EBL SOFR(1M)+0.11~0.75 2024 USD 149,592 189,578 Riyad Bank EBL SOFR(3M)+1.20 2025 USD 49,870 63,201 POSCO and others Shareholder’s loan 8.00 2025 USD 10,005 12,680 Shareholder’s loan 8.00 2031 JOD 4,853 8,671 Samsung Life Insurance and others Syndicated Loan 3.10~8.00 2032 JPY 4,752,934 45,304 Woori Bank and others Syndicated Loan JPY 6M Libor+1.84 2032 JPY 2,613,385 24,910 Solar Construction Lendings, LLC Facility 5.00 2025 USD 31,140 39,464 KiwoomSolar Power Professional Investor Private Placement Senior borrowing 3.90 2029 EUR 40,531 54,765 IFC and others Others 6M Libor+5.00 SOFR(3M)+1.83~1.99 5.41~6.19 2028~2031 USD 408,408 517,575 2022 Type Interest rate (%) Maturity Foreign currency Local currency In millions of won and thousands of foreign currencies Hanwha US Solar Private Fund and others PF Refinancing 3.00 2038 USD 58,308 73,894 DBS Bank and others Facility 1M BBSY+1.40~2.25 2025 AUD 190,860 163,836 Others Others — — USD 116 146 1,634,262 6,615,470 Less: Discount on long-term borrowings (15,719 ) Less: Current portion of long-term borrowings (3,638,202 ) Add: Current portion of discount on long-term borrowings 774 ￦ 2,962,323 (*) The main reasons for early repayment of securitized debts as of December 31, 2022 are as follows: Type Details Non-payment of proceeds Where the consignor fails to pay the principal to the trustee Guarantees for supplemental funding Where the consignor fails to fulfill guarantees for supplemental funding Additional trust obligation Where the consignor fails to fulfill the additional trust obligation Event of default In case the event of default occurs under the ABL loan agreement The consolidated entity is responsible for collateral obligations (fund supplementation) and liability guarantees for entrusted assets. (5) Local debt securities as of December 31, 2021 and 2022 are as follows: Issue date Maturity Interest rate (%) 2021 2022 In millions of won Electricity Bonds 2012.03.27~2022.12.28 2023.01.11~2052.04.21 1.14~5.99 ￦ 34,080,000 61,190,000 Corporate Bonds (*) 2009.10.16~2022.12.20 2023.01.11~2052.08.24 1.01~6.06 28,194,472 29,293,188 Corporate Bonds 2021.05.26 2041.05.25 2.00 — 11,578 62,274,472 90,494,766 Less: Discount on local debt securities (52,723 ) (56,924 ) Less: Current portion of local debt securities (7,432,647 ) (8,401,619 ) Add: Current portion of discount on local debt securities 2,510 2,344 ￦ 54,791,612 82,038,567 (*) Among the corporate bonds, each holder of Hee Mang Sunlight Power Co., Ltd.’s private equity bonds, amounting to ￦1,619 million, may exercise the early redemption rights on the 5th year (March 31, 2021) from the date of issuance of the bonds and every year on March 31 thereafter, until the year before the redemption date. (6) Foreign debt securities as of December 31, 2021 and 2022 are as follows: 2021 Type Issue date Maturity Interest rate (%) Foreign currency Local currency In millions of won and thousands of foreign currencies FY-96 1996.04.01~1996.12.06 2026.12.01~2096.04.01 6.00~7.95 USD 278,701 ￦ 330,400 FY-97 1997.01.31~1997.08.04 2027.02.01~2027.08.01 6.75~7.00 USD 314,717 373,097 FY-04 2004.04.23 2034.04.23 5.13 USD 286,920 340,144 FY-12 2012.09.19 2022.09.19 3.00 USD 750,000 889,125 FY-14 2014.07.30 2029.07.30 3.57 USD 100,000 118,550 FY-15 2015.06.15 2025.06.15 3.25 USD 300,000 355,650 FY-17 2017.06.19~2017.07.25 2022.06.19~2027.07.25 2.63~3.13 USD 800,000 948,400 FY-17 2017.10.30 2037.10.30 1.70 EUR 40,000 53,694 FY-17 2017.11.16 2037.11.16 2.36 SEK 450,000 58,968 FY-18 2018.03.13 2028.03.13 3.35 HKD 1,650,000 250,850 FY-18 2018.06.07~2018.07.25 2023.06.07~2023.07.25 3.75~3.88 USD 1,400,000 1,659,700 FY-19 2019.01.22~2019.06.24 2022.01.22~2024.06.24 2.50~3.38 USD 800,000 948,400 FY-19 2019.02.27 2024.02.27 0.13 CHF 200,000 259,494 FY-19 2019.07.19 2024.07.19~2027.07.19 0.00~0.05 CHF 300,000 389,241 FY-19 2019.07.22 2022.07.22 2.38 USD 300,000 355,650 FY-19 2019.10.30 2024.10.30 3M BBSW+0.97 AUD 300,000 257,667 FY-19 2019.12.19 2037.12.31 3.30~5.70 USD 371,947 440,943 FY-20 2020.02.03 2025.02.03 2.13 USD 300,000 355,650 FY-20 2020.05.06 2025.05.06 1.75 USD 500,000 592,750 FY-20 2020.06.15 2025.06.15 1.13 USD 500,000 592,750 FY-20 2020.08.03 2026.02.03 0.61 USD 300,000 355,650 FY-21 2021.01.27 2026.01.27 0.75 USD 450,000 533,475 FY-21 2021.04.27 2026.04.27 1.25 USD 500,000 592,750 FY-21 2021.08.09 2026.08.09 1.25 USD 300,000 355,650 FY-21 2021.09.24 2026.09.24 1.13 USD 300,000 355,650 11,764,298 Less: Discount on foreign debt securities (105,407 ) Add: Premium on foreign debt securities 1,031 Less: Current portion of foreign debt securities (2,220,339 ) Add: Current portion of discount on foreign debt securities 2,860 ￦ 9,442,443 2022 Type Issue date Maturity Interest rate (%) Foreign currency Local currency In millions of won and thousands of foreign currencies FY-96 1996.04.01~ 1996.12.06 2026.12.01~ 2096.04.01 6.00~7.95 USD 278,701 ￦ 353,198 FY-97 1997.01.31~1997.08.04 2027.02.01~2027.08.01 6.75~7.00 USD 314,717 398,841 FY-04 2004.04.23 2034.04.23 5.13 USD 286,920 363,614 FY-14 2014.07.30 2029.07.30 3.57 USD 100,000 126,730 FY-15 2015.06.15 2025.06.15 3.25 USD 300,000 380,190 FY-17 2017.07.25 2027.07.25 3.13 USD 300,000 380,190 FY-17 2017.10.30 2037.10.30 1.70 EUR 40,000 54,048 FY-17 2017.11.16 2037.11.16 2.36 SEK 450,000 54,527 FY-18 2018.03.13 2028.03.13 3.35 HKD 1,650,000 268,208 FY-18 2018.06.07~2018.07.25 2023.06.07~2023.07.25 3.75~3.88 USD 1,400,000 1,774,220 FY-19 2019.02.27 2024.02.27 0.13 CHF 200,000 274,574 FY-19 2019.06.24 2024.06.24 2.50 USD 500,000 633,650 FY-19 2019.07.19 2024.07.19~2027.07.19 0.00~0.05 CHF 300,000 411,861 FY-19 2019.10.30 2024.10.30 3M BBSW+0.97 AUD 300,000 257,523 FY-19 2019.12.19 2037.12.31 3.30~5.70 USD 360,899 457,368 FY-20 2020.02.03 2025.02.03 2.13 USD 300,000 380,190 FY-20 2020.05.06 2025.05.06 1.75 USD 500,000 633,650 FY-20 2020.06.15 2025.06.15 1.13 USD 500,000 633,650 FY-20 2020.08.03 2026.02.03 1.00 USD 300,000 380,190 FY-21 2021.01.27 2026.01.27 0.75 USD 450,000 570,285 FY-21 2021.04.27 2026.04.27 1.25 USD 500,000 633,650 FY-21 2021.08.09 2026.08.09 1.25 USD 300,000 380,190 FY-21 2021.09.24 2026.09.24 1.13 USD 300,000 380,190 FY-22 2022.04.21 2027.04.21 3.63 USD 300,000 380,190 FY-22 2022.05.06 2025.05.06 3.60 USD 500,000 633,650 FY-22 2022.06.14 2025.06.14~2027.06.14 3.63~4.00 USD 800,000 1,013,840 FY-22 2022.06.28 2025.06.28 4.13 USD 300,000 380,190 FY-22 2022.07.27 2027.07.27 4.25 USD 700,000 887,110 FY-22 2022.10.06 2026.04.06~2028.04.06 5.38~5.50 USD 800,000 1,013,840 FY-22 2022.10.06~2022.11.01 2032.10.06 5.16 HKD 2,350,000 381,992 14,871,549 Less: Discount on foreign debt securities (124,865 ) Add: Premium on foreign debt securities 663 Less: Current portion of foreign debt securities (1,803,776 ) Add: Current portion of discount on foreign debt securities 1,902 ￦ 12,945,473 (7) Changes in borrowings and debt securities for the years ended December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Beginning balance ￦ 69,724,581 80,529,513 Cash flow 9,653,394 39,193,816 Effect of exchange rate fluctuations 1,001,493 906,877 Others 150,045 (24,841 ) Ending balance ￦ 80,529,513 120,605,365

Lease

Lease	12 Months Ended
	Dec. 31, 2022
Presentation of leases for lessee [abstract]
Lease	24. Leases Company as a lessee (1) Lease contracts The Company applies the short-term leases recognition exemption to its lease contracts that have a lease term of 12 months or less from the commencement date, and recognized ￦199,490 million and ￦235,473 million respectively, as expense for the years ended December 31, 2021 and 2022. The Company also applies the leases of low-value (2) Right-of-use 2021 Acquisition cost Accumulated depreciation Book value In millions of won Land ￦ 814,795 (162,000 ) 652,795 Buildings 106,823 (43,939 ) 62,884 Structures 26,374 (5,226 ) 21,148 Machinery 1,308 (743 ) 565 Ships 4,217,735 (1,188,516 ) 3,029,219 Vehicles 30,375 (16,757 ) 13,618 Others(*) 2,650,728 (2,371,560 ) 279,168 ￦ 7,848,138 (3,788,741 ) 4,059,397 (*) Including a power purchase agreement (“PPA”) with CGN Yulchon Generation Co., Ltd. 2022 Acquisition cost Accumulated depreciation Book value In millions of won Land ￦ 886,076 (224,277 ) 661,799 Buildings 135,290 (60,434 ) 74,856 Structures 30,879 (6,914 ) 23,965 Machinery 1,737 (902 ) 835 Ships 4,151,460 (1,554,597 ) 2,596,863 Vehicles 35,712 (20,996 ) 14,716 Others(*) 751,570 (413,479 ) 338,091 ￦ 5,992,724 (2,281,599) 3,711,125 (*) Including a power purchase agreement (“PPA”) with CGN Yulchon Generation Co., Ltd. (3) Changes in right-of-use 2021 Beginning Increase Depreciation Decrease Others Ending In millions of won Land ￦ 706,579 7,312 (57,231 ) — (3,865 ) 652,795 Buildings 47,222 22,336 (25,780 ) (1,469 ) 20,575 62,884 Structures 20,486 2,198 (1,536 ) — — 21,148 Machinery 695 — (130 ) — — 565 Ships 3,437,363 9,694 (411,291 ) — (6,547 ) 3,029,219 Vehicles 13,525 9,583 (8,162 ) (7 ) (1,321 ) 13,618 Others 316,296 27,090 (54,435 ) (10,311 ) 528 279,168 ￦ 4,542,166 78,213 (558,565 ) (11,787 ) 9,370 4,059,397 2022 Beginning Increase Depreciation Decrease Others Ending In millions of won Land ￦ 652,795 63,654 (41,260 ) — (13,390 ) 661,799 Buildings 62,884 42,399 (30,243 ) (1,042 ) 858 74,856 Structures 21,148 4,256 (1,758 ) — 319 23,965 Machinery 565 429 (159 ) — — 835 Ships 3,029,219 — (393,677 ) — (38,679 ) 2,596,863 Vehicles 13,618 13,475 (8,673 ) (962 ) (2,742 ) 14,716 Others 279,168 72,803 (33,298 ) (834 ) 20,252 338,091 ￦ 4,059,397 197,016 (509,068 ) (2,838 ) (33,382 ) 3,711,125 (4) Lease liabilities as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Less than 1 year ￦ 620,121 639,756 1 ~ 5 years 2,158,145 2,047,584 More than 5 years 2,150,722 1,925,012 4,928,988 4,612,352 Less : Discount (518,485 ) (449,209 ) Present value of lease payment ￦ 4,410,503 4,163,143 (5) The details of the liquidity classification of lease liabilities as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Current lease liabilities ￦ 583,558 614,037 Non-current 3,826,945 3,549,106 ￦ 4,410,503 4,163,143 (6) Changes in lease liabilities for the years ended December 31, 2021 and 2022 are as follows: 2021 Beginning Increase Decrease Interest Others(*) Ending In millions of won Lease liabilities ￦ 4,621,096 73,090 (665,687 ) 93,651 288,353 4,410,503 2022 Beginning Increase Decrease Interest Others(*) Ending In millions of won Lease liabilities ￦ 4,410,503 109,019 (654,236 ) 91,590 206,267 4,163,143 (*) Including translation effect of foreign currency lease liabilities and others. (7) Details of expense relating to lease contracts as lessee for the years ended December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Depreciation of right-of-use ￦ 558,565 509,068 Interest expenses of lease liabilities 93,651 91,590 Leases expenses for short-term leases 199,490 235,473 Leases expenses for leases of low-value 2,349 3,147 Variable lease payments 54,675 112,158 ￦ 908,730 951,436 (8) The total cash outflow related to the lease contracts, including cash outflows due to short-term leases and leases of low-value 922,200 million and 1,005,014 million, for the years ended December 31, 2021 and 2022, respectively. Company as a lessor (1) Finance lease contracts The Company entered into power purchase agreements (“PPA”) with Jordan Electric Power Company to provide a 373MW level Qatrana gas combined power plant over a 25-year 20-year (2) Profit and loss related to finance lease for the years ended December 31, 2021 and 2022 2021 2022 In millions of won Finance income on the net investment in the lease ￦ 111,569 122,355 (3) Maturity analysis of the lease payments receivable and reconciliation of the undiscounted lease payments to the net investment in the lease as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Less than 1 year ￦ 172,528 181,930 1 ~ 2 years 163,937 169,693 2 ~ 3 years 158,933 166,787 3 ~ 4 years 156,450 166,196 4 ~ 5 years 155,068 166,965 More than 5 years 1,588,403 1,527,093 2,395,319 2,378,664 Less : Unearned finance income (1,194,627 ) (1,139,274 ) Net investment in the lease(*) ￦ 1,200,692 1,239,390 (*) Including the present value of unguaranteed residual value amounting to ￦19,574 million and ￦22,910 million, as of December 31, 2021 and 2022, respectively. The implicit interest rate for a lease term is determined on the lease contract date. The implicit interest rate of the finance lease contracts is from 0.00% up to 17.08% per year as of December 31, 2022. (prior year : 0.00% ~ 16.83%) (4) Changes in the allowance for doubtful accounts of finance lease receivables for the years ended December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Beginning balance ￦ 990 768 Bad debt expense — 3,737 Reversal of allowance for doubtful accounts (222 ) — Ending balance ￦ 768 4,505

Employment Benefits

Employment Benefits	12 Months Ended
	Dec. 31, 2022
Disclosure of information about defined benefit plans [abstract]
Employment Benefits	25. Employment Benefits (1) Employment benefit obligations as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Net defined benefit asset ￦ 20,871 198,626 Net defined benefit obligations 1,675,741 825,927 Other long-term employee benefit obligations 3,417 2,794 (2) Principal assumptions used for actuarial valuation as of December 31, 2021 and 2022 are as follows: 2021 2022 Discount rate 2.51%~2.60% 5.16%~5.19% Future salary and benefit levels 4.28% 4.55% Weighted average duration 10.39 years 8.84 years (3) Details of expense relating to defined benefit plans for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Current service cost ￦ 509,520 524,942 496,722 Interest cost 83,248 91,877 116,256 Expected return on plan assets (42,742 ) (52,782 ) (73,484 ) Past service cost (2,027 ) 5,483 125 Loss from settlement — — — ￦ 547,999 569,520 539,619 Expenses described above are recognized in those items below in the consolidated financial statements. 2020 2021 2022 In millions of won Cost of sales ￦ 397,442 416,287 404,243 Selling and administrative expenses 94,846 95,983 81,457 Others (Construction-in-progress 55,711 57,250 53,919 ￦ 547,999 569,520 539,619 In addition, for the years ended December 31, 2020, 2021 and 2022, employee benefit obligations expenses of, ￦60,587 million, ￦71,976 million and ￦101,369 million, respectively, are recognized as cost of sales, and ￦9,121 million, ￦17,144 million and, ￦28,301 million, respectively, are recognized as selling and administrative expenses, and ￦11,861 million, ￦13,025 million and ￦14,827 million, respectively, are recognized as construction-in-progress (4) Details of defined benefit obligations as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Present value of defined benefit obligation from funded plans ￦ 4,564,417 3,776,715 Fair value of plan assets (2,909,547 ) (3,149,414 ) Net liabilities incurred from defined benefit plans ￦ 1,654,870 627,301 (5) Changes in the present value of defined benefit obligations for the years ended December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Beginning balance ￦ 4,570,614 4,564,417 Current service cost 524,942 496,722 Interest cost 91,877 116,256 Remeasurement component (345,755 ) (1,012,727 ) Past service cost 5,483 125 Actual payments (282,794 ) (388,105 ) Others 50 27 Ending balance ￦ 4,564,417 3,776,715 (6) Changes in the fair value of plan assets for the years ended December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Beginning balance ￦ 2,670,832 2,909,547 Expected return 52,782 73,484 Remeasurement component (8,457 ) (11,609 ) Contributions by the employers 317,707 347,778 Actual payments (123,317 ) (169,786 ) Ending balance ￦ 2,909,547 3,149,414 In addition, gain on accumulated remeasurement component amounting to ￦98,844 million and gain on accumulated remeasurement component amounting to ￦614,805 million have been recognized as other comprehensive income or loss for the years ended December 31, 2021 and 2022, respectively. (7) Details of the fair value of plan assets as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Equity instruments ￦ 344,002 171,301 Debt instruments 744,167 854,640 Bank deposits 407,809 590,103 Others (*) 1,413,569 1,533,370 ￦ 2,909,547 3,149,414 (*) ‘Others’ consist of various financial assets managed by external asset management companies. For the years ended December 31, 2021 and 2022, actual returns on plan assets amounted to ￦44,325 and ￦61,875 million, respectively. (8) Remeasurement components recognized in other comprehensive income (loss) for the years ended December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Actuarial gain from changes in financial assumptions ￦ (258,194 ) (967,366 ) Experience adjustments, etc. (87,561 ) (45,361 ) Expected return 8,457 11,609 ￦ (337,298 ) (1,001,118 ) Remeasurement components recognized as other comprehensive income or loss are included in retained earnings.

Provisions

Provisions	12 Months Ended
	Dec. 31, 2022
Disclosure of other provisions [abstract]
Provisions	26. Provisions (1) Provisions as of December 31, 2021 and 2022 are as follows: 2021 2022 Current Non-current Current Non-current In millions of won Employment benefits Provisions for employment benefits ￦ 1,048,939 — 1,045,058 — Litigation Litigation provisions 26,269 88,449 26,974 154,205 Decommissioning cost Nuclear plants — 19,461,461 — 23,035,427 Spent fuel 457,466 893,196 415,890 1,011,028 Radioactive waste 137,342 1,695,193 94,158 1,895,849 PCBs — 103,665 — 88,359 Other recovery provisions — 30,231 — 32,770 Others Power plant regional support program 146,588 — 144,504 — Transmission regional support program 250,288 — 239,235 — Provisions for financial guarantee 21,032 59,809 22,895 44,345 Provisions for RPS — — 24,339 — Provisions for greenhouse gas emissions obligations 655,544 — 298,876 — Others 102,408 169,420 115,122 102,659 ￦ 2,845,876 22,501,424 2,427,051 26,364,642 (2) Changes in provisions for the years ended December 31, 2021 and 2022 are as follows: 202 1 Beginning Increase in provision Payment Reversal Others Ending balance In millions of won Employment benefits Provisions for employment benefits ￦ 1,024,574 1,048,569 (1,024,212 ) — 8 1,048,939 Litigation Litigation provisions 113,002 67,443 (44,446 ) (15,763 ) (5,518 ) 114,718 Decommissioning cost Nuclear plants 16,974,884 2,545,803 (59,226 ) — — 19,461,461 Spent fuel 1,354,001 452,063 (455,402 ) — — 1,350,662 Radioactive waste 1,891,613 3,862 (51,666 ) (11,274 ) — 1,832,535 PCBs 119,019 2,182 (17,408 ) (128 ) — 103,665 Other recovery provisions 25,840 553 (169 ) — 4,007 30,231 Others Power plant regional support program 144,272 49,596 (47,280 ) — — 146,588 Transmission regional support 96,895 306,409 (153,016 ) — — 250,288 Provisions for financial guarantee 66,354 85,355 (72,109 ) — 1,241 80,841 Provisions for RPS 9,126 445,402 (430,344 ) (24,184 ) — — Provisions for greenhouse gas 393,121 547,911 (235,469 ) (2,174 ) (47,845 ) 655,544 Others 314,535 104,416 (95,541 ) (40,139 ) (11,443 ) 271,828 ￦ 22,527,236 5,659,564 (2,686,288 ) (93,662 ) (59,550 ) 25,347,300 (2) Changes in provisions for the years ended December 31, 2021 and 2022 are as follows, continued: 2022 Beginning Increase in provision Payment Reversal Others Ending balance In millions of won Employment benefits Provisions for employment benefits ￦ 1,048,939 997,281 (1,001,283 ) — 121 1,045,058 Litigation Litigation provisions 114,718 112,797 (39,633 ) (6,360 ) (343 ) 181,179 Decommissioning cost Nuclear plants 19,461,461 3,630,830 (56,813 ) — (51 ) 23,035,427 Spent fuel 1,350,662 493,943 (417,687 ) — — 1,426,918 Radioactive waste 1,832,535 221,629 (64,157 ) — — 1,990,007 PCBs 103,665 1,949 (17,156 ) (99 ) — 88,359 Other recovery provisions 30,231 2,093 (165 ) (751 ) 1,362 32,770 Others Power plant regional support program 146,588 52,470 (54,554 ) — — 144,504 Transmission regional support program 250,288 176,424 (187,477 ) — — 239,235 Provisions for financial guarantee 80,841 4,738 (17,789 ) — (550 ) 67,240 Provisions for RPS — 587,586 (556,993 ) (6,254 ) — 24,339 Provisions for greenhouse gas emissions obligations 655,544 387,299 (590,172 ) (33,596 ) (120,199 ) 298,876 Others 271,828 4,447 (39,566 ) (19,853 ) 925 217,781 ￦ 25,347,300 6,673,486 (3,043,445 ) (66,913 ) (118,735 ) 28,791,693 (3) Greenhouse gas emissions rights and obligations: (i) Allowances received free of charge from the government for each planned period as of December 31, 2022 are as follows: 3rd planned period 2021 2022 2023 2024 2025 Total In ten thousands of tons(tCO2-eq) Allowances received free of charge from the government 15,085 14,789 14,784 4,928 4,928 54,514 (ii) Changes in greenhouse gas emissions rights for the years ended December 31, 2021 and 2022 are as follows: 2021 2nd planned period 3rd planned period 2020 2021 2022 2023 2024 2025 Total Quantity Amount Quantity Amount Quantity Amount Quantity Amount Quantity Amount Quantity Amount Quantity Amount In ten thousands tons(tCO2-eq), Beginning 17,905 357,355 16,051 38,338 15,782 — 15,782 — 5,261 — 5,261 — 58,137 38,338 Purchase (Sell) 433 95,375 1,426 410,099 (31 ) 7,296 (43 ) 5,479 (75 ) — (50 ) 6,873 1,227 429,747 Government submission (17,560 ) (280,924 ) — — — — — — — — — — — — Borrowing (carryforward) (539 ) (113,014 ) 352 76,221 277 55,439 10 3,050 — — — — 639 134,710 Others (239 ) (58,792 ) — — — — — — — — — — — — Ending — — 17,829 524,658 16,028 62,735 15,749 8,529 5,186 — 5,211 6,873 60,003 602,795 2022 3rd planned period 2021 2022 2023 2024 2025 Total Quantity Amount Quantity Amount Quantity Amount Quantity Amount Quantity Amount Quantity Amount In ten thousands tons(tCO2-eq), Beginning (*) 16,433 524,658 14,942 62,735 11,166 8,529 3,671 — 3,696 6,873 49,908 602,795 Purchase (Sell) 1,191 267,433 1,343 272,824 32 6,315 35 7,185 — — 2,601 553,757 Government submission (17,602 ) (580,807 ) (838 ) (173,145 ) — 245 — — — — (18,440 ) (753,707 ) Borrowing (carryforward) (22 ) (3,298 ) 286 45,847 48 12,225 22 5,699 — — 334 60,473 Others — (207,986 ) — (16,256 ) — (8,529 ) — — — 5,419 — (227,352 ) Ending — — 15,733 192,005 11,246 18,785 3,728 12,884 3,696 12,292 34,403 235,966 (*) Changes such as additional allowances or cancellation of allowances are reflected. (iii) The Company does not have greenhouse gas emissions rights pledged as collateral as of December 31, 2022. (iv) The Company does not hold any greenhouse gas emissions rights prepared for generating a profit from short-term fluctuations in price as of December 31, 2022. (v) Estimated greenhouse gas emission of the Company for the year ended December 31, 2022 is 13,167 ten thousand tons.

Government Grants

Government Grants	12 Months Ended
	Dec. 31, 2022
Government grants [Abstract]
Government Grants	27. Government Grants (1) Government grants as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Land ￦ (23,474 ) (27,405 ) Buildings (52,122 ) (50,437 ) Structures (172,021 ) (165,608 ) Machinery (140,082 ) (127,126 ) Vehicles (1,675 ) (2,045 ) Equipment (149 ) (6,608 ) Tools (64 ) (99 ) Construction-in-progress (111,822 ) (135,926 ) Investment properties (30 ) (21 ) Software (91 ) (174 ) Development expenditures (3,820 ) (3,477 ) Intangible assets under development (7,326 ) (2,108 ) Other intangible assets (71 ) (67 ) ￦ (512,747 ) (521,101 ) (2) Changes in government grants for the years ended December 31, 2021 and 2022 are as follows: 2021 Beginning Receipt Acquisition Offset the Disposal Others Ending In millions of won Cash ￦ — (37,920 ) — — — 37,920 — Land (23,475 ) — — — 1 — (23,474 ) Buildings (57,231 ) — — 5,174 — (65 ) (52,122 ) Structures (180,009 ) — — 9,517 1,811 (3,340 ) (172,021 ) Machinery (157,785 ) — — 17,519 531 (347 ) (140,082 ) Vehicles (632 ) — (26 ) 460 — (1,477 ) (1,675 ) Equipment (227 ) — — 95 — (17 ) (149 ) Tools (239 ) — — 209 — (34 ) (64 ) Construction-in-progress (79,126 ) — 5,027 — — (37,723 ) (111,822 ) Investment properties (29 ) — — 1 — (2 ) (30 ) Software (136 ) — — 64 — (19 ) (91 ) Development expenditures (5,043 ) — — 1,439 — (216 ) (3,820 ) Intangible assets under development (7,203 ) — — — — (123 ) (7,326 ) Other intangible assets (75 ) — — 4 — — (71 ) ￦ (511,210 ) (37,920 ) 5,001 34,482 2,343 (5,443 ) (512,747 ) 2022 Beginning Receipt Acquisition Offset the Disposal Others Ending In millions of won Cash ￦ — (50,755 ) — — — 50,755 — Land (23,474 ) — — — 1 (3,932 ) (27,405 ) Buildings (52,122 ) — — 5,360 — (3,675 ) (50,437 ) Structures (172,021 ) — — 9,568 1,250 (4,405 ) (165,608 ) Machinery (140,082 ) — — 17,283 405 (4,732 ) (127,126 ) Vehicles (1,675 ) — — 663 — (1,033 ) (2,045 ) Equipment (149 ) — — 494 — (6,953 ) (6,608 ) Tools (64 ) — — 32 — (67 ) (99 ) Construction-in-progress (111,822 ) — 23,155 — 17 (47,276 ) (135,926 ) Investment properties (30 ) — — 1 — 8 (21 ) Software (91 ) — — 60 — (143 ) (174 ) Development expenditures (3,820 ) — — 1,466 — (1,123 ) (3,477 ) Intangible assets under development (7,326 ) — — — — 5,218 (2,108 ) Other intangible assets (71 ) — — 4 — — (67 ) ￦ (512,747 ) (50,755 ) 23,155 34,931 1,673 (17,358 ) (521,101 ) (3) Changes in government grants for specific business projects for the years ended December 31, 2021 and 2022 are as follows: 2021 Increase Decrease Received Interests Used Return Department Business Description Period Budget Beginning Self- Local Subsidies Self- Local Subsidies Self- Local Subsidies Self- Local Subsidies Others Ending In millions of won Ministry of Trade, Temporary Temporary 2021.04.01 ~ 2022.06.30 211,235 748 — — 139,550 — — — — — (122,563 ) — — — — 17,735 2022 Increase Decrease Received Interests Used Return Department Business Description Period Budget Beginning Self- Local Subsidies Self- Local Subsidies Self- Local Subsidies Self- Local Subsidies Others Ending In millions of won Ministry of Trade, Temporary Temporary 2021.04.01 ~ 2022.06.30 211,235 17,735 — — 71,685 — — — — — (88,300 ) — — — — 1,120

Deferred Revenues

Deferred Revenues	12 Months Ended
	Dec. 31, 2022
Deferred income including contract liabilities [abstract]
Deferred Revenues	28. Deferred Revenues Deferred revenue for the years ended December 31, 2021 and 2022 are as follows which included in current and non-current non-financial 2021 2022 In millions of won Beginning balance ￦ 9,868,189 10,356,555 Increase 1,149,578 1,330,129 Recognized as revenue (661,212 ) (711,839 ) Ending balance ￦ 10,356,555 10,974,845

Non-financial Liabilities

Non-financial Liabilities	12 Months Ended
	Dec. 31, 2022
Other Liabilities Disclosure [Abstract]
Non-financial Liabilities	29. Non-financial Non-financial 2021 2022 Current Non-current Current Non-current In millions of won Advance received ￦ 4,157,916 398,056 4,544,206 284,618 Unearned revenue 40,187 6,517 86,584 7,200 Deferred revenue 659,397 9,697,158 702,430 10,272,415 Withholdings 345,892 5,171 207,217 2,408 Others 1,262,941 109,462 1,433,940 96,020 ￦ 6,466,333 10,216,364 6,974,377 10,662,661

Contributed Capital

Contributed Capital	12 Months Ended
	Dec. 31, 2022
Disclosure of classes of share capital [abstract]
Contributed Capital	30. Contributed Capital (1) Details of shares issued as of December 31, 2021 and 2022 are as follows: 2021 Shares authorized Shares Par value per share (in won) Owned by Owned by Total In millions of won except share information Common shares 1,200,000,000 641,964,077 ￦ 5,000 1,640,385 1,569,435 3,209,820 (*) Korea Development Bank’s interest of ￦1,056,176 million is included. 2022 Shares authorized Shares Par value per share (in won) Owned by Owned by Total In millions of won except share information Common shares 1,200,000,000 641,964,077 ￦ 5,000 1,640,385 1,569,435 3,209,820 (*) Korea Development Bank’s interest of ￦1,056,176 million is included. (2) Details in number of outstanding capital stock for the years ended December 31, 2021 and 2022 are as follows. 2021 2022 Number of shares Beginning balance 641,964,077 641,964,077 Ending balance 641,964,077 641,964,077 (3) Details of share premium as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Share premium ￦ 843,758 843,758

Retained Earnings and Dividends

Retained Earnings and Dividends Paid	12 Months Ended
	Dec. 31, 2022
Retained earnings [abstract]
Retained Earnings and Dividends Paid	31. Retained Earnings and Dividends Paid (1) Details of retained earnings as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Legal reserve (*) ￦ 1,604,910 1,604,910 Voluntary reserves 33,282,817 27,782,969 Retained earnings (Undisposed deficit) 10,370,517 (7,956,579 ) Retained earnings ￦ 45,258,244 21,431,300 (*) The KEPCO Act requires KEPCO to appropriate a legal reserve equal to at least 20 percent of net income for each accounting period until the reserve equals 50 percent of KEPCO’s common stock. The legal reserve is not available for cash dividends; however, this reserve may be credited to paid-in (2) Details of voluntary reserves as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Reserve for investment on social overhead capital ￦ 5,277,449 5,277,449 Reserve for research and human development (*) 330,000 330,000 Reserve for business expansion 27,465,368 21,965,520 Reserve for equalizing dividends 210,000 210,000 ￦ 33,282,817 27,782,969 (*) The reserve for research and human development is appropriated by KEPCO to use as qualified tax credits to reduce corporate tax liabilities. The reserve is available for cash dividends for a certain period as defined by the Restriction of Special Taxation Act of Korea. (3) Changes in retained earnings for the years ended December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Beginning balance ￦ 51,134,330 45,258,244 Loss for the year attributed to owners of the controlling company (5,304,522 ) (24,466,853 ) Changes in equity method retained earnings 3,609 12,305 Remeasurements of defined benefit liability, net of tax 201,067 626,769 Transfer of gain or loss on valuation of financial assets at FVOCI 4,388 — Dividends paid (780,628 ) — Additional paid-in capital and others — 835 Ending balance ￦ 45,258,244 21,431,300 (4) Dividends paid for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 In millions of won Number of shares issued Number of treasury stocks Number of shares eligible for dividends Dividends paid per share Dividends paid (In won) Common shares 641,964,077 — 641,964,077 ￦ — — 2021 In millions of won Number of shares issued Number of treasury stocks Number of shares eligible for dividends Dividends paid per share Dividends paid (In won) Common shares 641,964,077 — 641,964,077 ￦ 1,216 780,628 2022 In millions of won Number of shares issued Number of treasury stocks Number of shares eligible for dividends Dividends paid per share Dividends paid (In won) Common shares 641,964,077 — 641,964,077 ￦ — — (5) Changes in retained earnings of investments in associates and joint ventures for the years ended December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Beginning balance ￦ 361 3,970 Changes 3,609 12,305 Ending balance ￦ 3,970 16,275 (6) Changes in remeasurement components related to defined benefit liability for the years ended December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Beginning balance ￦ (169,234 ) 98,844 Changes 327,957 964,791 Income tax effect (126,890 ) (338,022 ) Transfer to reserve for business expansion 67,011 (110,808 ) Ending balance ￦ 98,844 614,805

Statements of Appropriation of

Statements of Appropriation of Retained Earnings (Disposition of Deficit)	12 Months Ended
	Dec. 31, 2022
Statement of Appropriation of Retained Earnings [Abstract]
Statements of Appropriation of Retained Earnings (Disposition of Deficit)	32. Statements of Appropriation of Retained Earnings (Disposition of Deficit) For the year ended December 31, 2021, KEPCO’s Deficit was disposed on March 29, 2022. For the year ended December 31, 2022, KEPCO’s deficits are expected to be disposed on March 28, 2023. Statements of disposition of deficit of KEPCO, the controlling company, for the years ended December 31, 2021 and 2022, respectively, are as follows: 2021 2022 In millions of won except for I.   Deficit before disposition Undisposed deficit carried over from prior years ￦ — — Net loss (5,607,732 ) (25,297,713 ) Remeasurement of the defined benefit plan 107,884 327,056 (5,499,848 ) (24,970,657 ) II. Transfer from voluntary reserves 5,499,848 24,970,657 III.  Subtotal ( I+II ) — — IV.  Disposition of deficit V. Undisposed deficit to be carried over forward to subsequent year — —

Hybrid Bonds

Hybrid Bonds	12 Months Ended
	Dec. 31, 2022
Hybrid Bonds [Abstract]
Hybrid Bonds	33. Hybrid Bonds Hybrid bonds classified as equity (non-controlling Issuer Hybrid bond Issued date Maturity Yield (%) 2021 2022 In millions of won Korea South-East Power Co., Ltd. (*1) 1st hybrid bond 2012.12.07 2042.12.06 4.38 ￦ 170,000 — Korea South-East Power Co., Ltd. (*2) 2nd hybrid bond 2012.12.07 2042.12.06 4.44 230,000 230,000 Expense of issuance (1,090 ) (627 ) ￦ 398,910 229,373 (*1) The call option was exercised for the 1st hybrid bond during the current period. (*2) Bondholders may not require prepayment in any case, and the Company has a call option to repay all of these bonds on or after 12 years from the date of issuance of the bonds, or on each interest payment date henceforth. In addition, there is a step-up clause from the date of the initial call option exercise. Although these instruments have contractual maturity dates, the contractual agreements allow these subsidiaries to indefinitely extend the maturity dates and defer the payment of interest without modification to the other terms of the instruments. When the Company decides not to pay dividends on common shares, they are not required to pay interest on the hybrid bonds.

Other Components of Equity

Other Components of Equity	12 Months Ended
	Dec. 31, 2022
Disclosure of reserves within equity [abstract]
Other Components of Equity

Sales

Sales	12 Months Ended
	Dec. 31, 2022
Revenue [abstract]
Sales	35. Sales Details of sales for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 Domestic Overseas Domestic Overseas Domestic Overseas In millions of won [Type of goods and services] Sales of goods ￦ 56,381,405 303,704 58,359,774 441,203 68,578,390 606,079 Electricity 55,731,782 — 57,308,555 — 66,198,964 — Heat supply 198,715 — 232,738 — 489,629 — Others 450,908 303,704 818,481 441,203 1,889,797 606,079 Sales related to rendering of services 223,075 206,275 252,216 204,184 370,799 343,803 Sales related to construction services 170,895 641,280 159,262 595,736 193,541 453,412 ￦ 56,775,375 1,151,259 58,771,252 1,241,123 69,142,730 1,403,294 [Timing of revenue recognition] Performance obligations satisfied at a point in time ￦ 56,381,405 303,704 58,359,774 441,203 68,578,390 606,079 Performance obligations satisfied over time 393,970 847,555 411,478 799,920 564,340 797,215 ￦ 56,775,375 1,151,259 58,771,252 1,241,123 69,142,730 1,403,294

Selling and Administrative Expe

Selling and Administrative Expenses	12 Months Ended
	Dec. 31, 2022
Selling, general and administrative expense [abstract]
Selling and Administrative Expenses	36. Selling and Administrative Expenses (1) Selling and administrative expenses for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Salaries ￦ 1,095,183 1,121,188 1,142,360 Retirement benefit expense 103,967 113,127 109,758 Welfare and benefit expense 155,071 155,558 155,781 Insurance expense 10,178 17,909 20,835 Depreciation 218,103 219,427 244,676 Amortization of intangible assets 87,086 91,428 85,661 Bad debt expense 20,648 17,968 23,634 Commission 368,275 410,287 420,390 Advertising expense 29,559 29,230 33,739 Training expense 5,196 4,923 7,327 Vehicle maintenance expense 9,435 8,849 10,749 Publishing expense 3,677 3,568 3,732 Business promotion expense 3,614 3,522 3,198 Rent expense 36,337 43,650 47,680 Telecommunication expense 8,686 8,569 7,945 Transportation expense 1,007 870 1,012 Taxes and dues 62,828 93,446 122,177 Expendable supplies expense 8,029 9,052 9,617 Water, light and heating expense 11,749 12,351 17,950 Repairs and maintenance expense 79,185 123,134 152,449 Ordinary development expense 197,436 213,936 213,932 Travel expense 10,793 11,099 16,062 Clothing expense 14,834 10,540 13,044 Survey and analysis expense 826 889 1,126 Membership fee 1,274 1,331 1,469 Others 135,467 149,945 143,119 ￦ 2,678,443 2,875,796 3,009,422 (2) Details of “others” included in selling and administrative expenses for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Accommodation development expenses ￦ 30,889 57,815 56,038 Miscellaneous wages 45,887 47,221 31,910 Litigation and filing expenses 19,341 16,383 14,876 Compensation for damages 8,374 3,303 3,116 Outsourcing expenses 3,610 3,799 3,635 Reward expenses 3,228 3,006 2,740 Overseas market development expenses 1,218 1,192 1,376 Others 22,920 17,226 29,428 ￦ 135,467 149,945 143,119

Other Income and Expenses

Other Income and Expenses	12 Months Ended
	Dec. 31, 2022
Disclosure of other operating income (expense) [Abstract]
Other Income and Expenses	37. Other Income and Expenses (1) Other income for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Reversal of other provisions ￦ 25,826 15,548 15,265 Reversal of other allowance for doubtful accounts 2,465 98 37 Gains on government grants 269 458 301 Gains on assets contributed 24,324 9,347 1,953 Gains on liabilities exempted 1,314 1,830 1,181 Compensation and reparations revenue 95,407 104,826 89,638 Revenue from foundation fund — 1 3 Revenue from research contracts 4,001 5,996 8,191 Income related to transfer of assets from customers 643,477 661,212 711,839 Rental income 193,567 204,123 208,064 Others 45,798 30,694 59,017 ￦ 1,036,448 1,034,133 1,095,489 (2) Details of “others” included in other income for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Refund of claim for rectification ￦ 11,880 7,274 701 Adjustment of research project 2,150 7,638 — Maintenance expenses on lease building 2,785 160 125 Training expenses 3,852 1,739 1,684 Deposit redemption 314 378 12 Reversal of expenses on litigation 620 991 1,920 Revenue on royalty fee — 173 455 Reimbursement of insurance fee 22 1 — Gains on guarantee contracts 134 27 22 Others 24,041 12,313 54,098 ￦ 45,798 30,694 59,017 (3) Other expenses for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Compensation and indemnification expense ￦ 11,959 663 36 Accretion expenses of other provisions 17,991 2,711 1,138 Depreciation expenses on investment properties 1,453 1,386 486 Depreciation expenses on idle assets 6,604 3,621 3,635 Other bad debt expense 32,503 49,372 6,400 Donations 316,981 152,456 131,037 Others 30,229 47,723 69,418 ￦ 417,720 257,932 212,150 (4) Details of “others” included in other expenses for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Operating expenses related to the idle assets ￦ 46 44 1,683 Research grants 91 109 562 Expenses related to farming and fishing village supports 16,115 17,065 11,272 Expenses related to Operating of a fitness center 5,101 6,948 8,370 Expenses on adjustment of research and development grants 720 2,241 260 Taxes and dues 253 119 31,985 Expenses on R&D supports 242 861 48 Others 7,661 20,336 15,238 ￦ 30,229 47,723 69,418

Other Gains (Losses)

Other Gains (Losses)	12 Months Ended
	Dec. 31, 2022
Other Gains (Losses) [Abstract]
Other Gains (Losses)	38. Other Gains (Losses) (1) Composition of other gains (losses) for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Other gains Gains on disposal of property, plant and equipment ￦ 93,195 56,284 148,667 Gains on disposal of intangible assets 1,556 1 41 Reversal of impairment loss on property, plant and equipment 7,805 — 134,735 Reversal of impairment loss on intangible assets — 14 — Gains on foreign currency translation 8,917 20,598 36,097 Gains on foreign currency transaction 61,865 48,671 235,221 Gains on insurance proceeds 43,800 144 43,497 Others 322,379 250,174 294,091 Other losses Losses on disposal of property, plant and equipment (162,725 ) (92,622 ) (100,066 ) Losses on disposal of intangible assets (392 ) (145 ) (116 ) Losses on valuation of other non-current assets (241 ) — — Impairment loss on property, plant and equipment (80,413 ) (4,056 ) (37,311 ) Impairment loss on intangible assets (3,599 ) — (164 ) Impairment loss on other non-current — (16,035 ) — Losses on foreign currency translation (17,664 ) (4,732 ) (14,738 ) Losses on foreign currency transaction (49,694 ) (67,990 ) (299,117 ) Others (189,695 ) (181,787 ) (197,715 ) ￦ 35,094 8,519 243,122 (2) Details of “others” included in other gains for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Gains on disposal of inventories ￦ 3,373 4,446 11,091 Gains on proxy collection of TV license fee 41,438 42,271 42,286 Gains on compensation of impaired electric poles 978 812 768 Gains on harbor facilities dues 2,231 3,281 4,198 Gains on technical fees 4,826 3,968 2,972 Reversal of occupation development training fees 352 229 525 Gains on disposal of waste 6,927 4,272 7,749 Gains on insurance — 690 — Gains on tax rebate 772 685 548 Gains on other commission 1,643 1,822 2,097 Gains on disposal of greenhouse gas emissions rights — 8,739 — Gains on disposal of assets held-for-sale — 160 236 Others 259,839 178,799 221,621 ￦ 322,379 250,174 294,091 (3) Details of “others” included in other losses for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Losses on valuation of inventories ￦ 4,998 7,761 14,528 Losses on disposal of inventories 37,644 8,874 8,324 Losses due to disaster 16,814 6,238 5,068 Losses on rounding adjustment of electric charge surtax 1,276 1,283 1,317 Loss on disposal of greenhouse gas emissions rights — 11,282 — Others 128,963 146,349 168,478 ￦ 189,695 181,787 197,715

Finance Income

Finance Income	12 Months Ended
	Dec. 31, 2022
Finance income [Abstract]
Finance Income	39. Finance Income (1) Finance income for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Interest income ￦ 242,586 221,874 340,753 Dividends income 7,316 10,522 28,875 Gains on disposal of financial assets 11,992 7,718 11,199 Gains on valuation of financial assets at fair value through profit or loss 12,904 14,338 7,099 Gains on valuation of derivatives 57,563 860,011 595,256 Gains on transaction of derivatives 146,448 124,900 429,847 Gains on foreign currency translation 1,005,961 146,349 389,361 Gains on foreign currency transactions 24,009 15,618 29,997 Other financial income 1,470 1,284 925 ￦ 1,510,249 1,402,614 1,833,312 (2) Details of interest income included in finance income for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Cash and cash equivalents ￦ 9,419 12,692 51,872 Financial assets at fair value through profit or loss 19,114 18,415 58,540 Financial assets at amortized cost 612 797 1,308 Loans 26,232 25,196 33,545 Short-term financial instruments 25,540 7,531 15,827 Long-term financial instruments 10,406 12,470 14,371 Other financial assets 228 230 637 Trade and other receivables 151,035 144,543 164,653 ￦ 242,586 221,874 340,753

Finance Expenses

Finance Expenses	12 Months Ended
	Dec. 31, 2022
Finance Expenses [Abstract]
Finance Expenses	40. Finance Expenses (1) Finance expenses for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Interest expense ￦ 1,995,425 1,914,457 2,818,546 Losses on sale of financial assets 648 1,045 1,841 Losses on valuation of financial assets at fair value through profit or loss 7,396 5,480 44,329 Losses on valuation of derivatives 513,278 37,017 371,038 Losses on transaction of derivatives 81,055 40,818 205,162 Losses on foreign currency translation 215,047 1,159,334 934,005 Losses on foreign currency transaction 79,103 83,558 346,711 Losses on repayment of financial liabilities 35 10 15 Others 4,456 4,058 25,144 ￦ 2,896,443 3,245,777 4,746,791 (2) Details of interest expense included in finance expenses for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Trade and other payables ￦ 88,757 213,765 204,078 Short-term borrowings 29,358 42,371 145,201 Long-term borrowings 118,678 115,141 204,037 Debt securities 1,805,253 1,728,588 2,388,517 Other financial liabilities 540,867 384,423 472,248 2,582,913 2,484,288 3,414,081 Less: Capitalized borrowing costs (587,488 ) (569,831 ) (595,535 ) ￦ 1,995,425 1,914,457 2,818,546 Capitalization rates for the years ended December 31, 2020, 2021 and 2022 are 2.14%~4.84%, 2.02%~4.33% and 2.25%~3.86%, respectively.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2022
Income Taxes [Abstract]
Income Taxes	41. Income Taxes (1) Income tax expense (benefit) for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Current income tax expense Payment of income tax ￦ 671,179 357,767 563,681 Adjustment in respect of prior years due to change in estimate (63,756 ) 153,113 48,374 Current income tax directly recognized in equity 51,486 (198,714 ) (350,348 ) 658,909 312,166 261,707 Deferred tax expense (benefit) Generation and realization of temporary differences (77,985 ) (489,411 ) (564,801 ) Reclassified from equity to profit (loss) — — (4,964 ) Changes of unrecognized tax losses, tax credit and temporary differences for prior periods (10,471 ) (43,653 ) (38,708 ) Changes in deferred tax on tax losses carryforwards 296,070 (1,641,823 ) (9,175,755 ) Tax credit carryforwards 32,541 (12,199 ) 34,019 Amount due to change in tax rate or regulations — 18,931 73,991 240,155 (2,168,155 ) (9,676,218 ) Income tax expense (benefit) ￦ 899,064 (1,855,989 ) (9,414,511 ) (2) Reconciliation between actual income tax expense (benefit) and amount computed by applying the statutory tax rate to profit (loss) before income taxes for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Profit (loss) before income tax ￦ 2,991,533 (7,071,570 ) (33,843,619 ) Income tax expense (benefit) computed at applicable tax rate (*1) 822,672 (1,944,682 ) (9,306,995 ) Adjustments Effect of applying gradual tax rate (10,362 ) (10,362 ) (10,362 ) Effect of non-taxable (13,593 ) (4,983 ) (9,471 ) Effect of non-deductible 46,776 78,814 39,663 Effect of tax losses that are not recognized as deferred tax asset — 1,351 19,275 Effects of tax credits and deduction (63,753 ) (43,931 ) (98,684 ) Reversal of unrecognized deferred tax asset, net (10,471 ) (43,641 ) (38,708 ) Effect of change in deferred tax due to change in tax rate (17,590 ) 18,931 393,416 Deduction of deferred tax assets 55,682 73,887 (85,514 ) Deferred tax related to investments in subsidiaries, associates and joint ventures 102,137 (135,878 ) (375,064 ) Others, net 51,322 1,392 9,559 140,148 (64,420 ) (155,890 ) Adjustment in respect of prior years due to change in estimate (63,756 ) 153,113 48,374 Income tax expense (benefit) ￦ 899,064 (1,855,989 ) (9,414,511 ) Effective tax rate 30.05 % (*2 ) (*2 ) (*1) Applicable tax rate is 27.5% as of December 31, 2020, 2021 and 2022. (*2) The effective tax rate for the year ended December 31, 2020 is 30.05 (3) Income tax directly adjusted to equity (except for accumulated other comprehensive income (loss)) for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Dividends of hybrid bond ￦ 4,273 4,736 4,149 Disposal of subsidiaries — — 406 ￦ 4,273 4,736 4,555 (4) Income tax recognized as other comprehensive income (loss) for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Income tax recognized as other comprehensive income (loss) Gain (loss) on valuation of financial assets at fair value through other comprehensive income ￦ 19,447 (9,753 ) (31,416 ) Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax (47,231 ) 24,220 40,390 Remeasurement of defined benefit liability 14,971 (126,890 ) (322,489 ) Investments in associates 35,714 (53,672 ) (66,677 ) Others 24,312 (37,355 ) 25,289 ￦ 47,213 (203,450 ) (354,903 ) (5) Changes in deferred tax assets (liabilities) recognized in the consolidated statements of financial position for the years ended December 31, 2021 and 2022 are as follows: 2021 Beginning balance Amounts Amount Amounts recognized directly in equity Ending balance In millions of won Deferred tax on temporary differences Employee benefits ￦ 689,787 (4,514 ) (126,890 ) — 558,383 Cash flow hedge 15,587 (90,217 ) 24,220 463 (49,947 ) Investments in subsidiaries, associates and joint ventures (8,668,015 ) 367 (53,672 ) — (8,721,320 ) Property, plant and equipment (7,713,449 ) 282,988 — — (7,430,461 ) Finance lease (211,420 ) (204,138 ) — — (415,558 ) Intangible assets (31,166 ) (315 ) — — (31,481 ) Financial assets at fair value through profit or loss 13 (1 ) — — 12 Financial assets at fair value through other comprehensive income 37,950 (816 ) (9,753 ) — 27,381 Deferred revenue 199,701 (13,310 ) — — 186,391 Provisions 5,916,803 577,511 — — 6,494,314 Doubtful receivables — 801 — — 801 Other finance liabilities 30,399 (3,262 ) — 4,273 31,410 Gains or losses on foreign exchange translation (11,635 ) 103,046 — — 91,411 Allowance for doubtful accounts 56,129 8,135 — — 64,264 Accrued income 8,944 1,058 — — 10,002 Special deduction for property, plant and equipment (226,351 ) 2,224 — — (224,127 ) Others 1,505,951 (22,769 ) (37,355 ) — 1,445,827 (8,400,772 ) 636,788 (203,450 ) 4,736 (7,962,698 ) Deferred tax on unused tax losses and tax credit Unused tax losses 893,074 1,666,803 — — 2,559,877 Excess of donation limit 35,181 34,004 — — 69,185 Tax credit 105,416 29,274 — — 134,690 1,033,671 1,730,081 — — 2,763,752 ￦ (7,367,101 ) 2,366,869 (203,450 ) 4,736 (5,198,946 ) 2022 Beginning balance Amounts Amount Amounts recognized directly in equity Ending balance In millions of won Deferred tax on temporary differences Employee benefits ￦ 558,383 (36,341 ) (322,489 ) — 199,553 Cash flow hedge (49,947 ) (46,188 ) 40,390 405 (55,340 ) Investments in subsidiaries, associates and joint ventures (8,721,320 ) 410,310 (66,677 ) — (8,377,687 ) Property, plant and equipment (7,430,461 ) (111,177 ) — — (7,541,638 ) Finance lease (415,558 ) 9,919 — — (405,639 ) Intangible assets (31,481 ) 6,550 — — (24,931 ) Financial assets at fair value through profit or loss 12 3,445 — — 3,457 Financial assets at fair value through other comprehensive income 27,381 25,178 (31,416 ) — 21,143 Deferred revenue 186,391 (16,411 ) — — 169,980 Provisions 6,494,314 595,030 — — 7,089,344 Doubtful receivables 801 1,673 — — 2,474 Other finance liabilities 31,410 (14,142 ) — 4,150 21,418 Gains or losses on foreign exchange translation 91,411 42,905 — — 134,316 Allowance for doubtful accounts 64,264 (6,029 ) — — 58,235 Accrued income 10,002 6,612 — — 16,614 Special deduction for property, plant and equipment (224,127 ) 8,968 — — (215,159 ) Others 1,445,827 16,456 25,289 — 1,487,572 (7,962,698 ) 896,758 (354,903 ) 4,555 (7,416,288 ) Deferred tax on unused tax losses and tax credit Unused tax losses 2,559,877 9,102,228 — — 11,662,105 Excess of donation limit 69,185 11,861 — — 81,046 Tax credit 134,690 15,719 — — 150,409 2,763,752 9,129,808 — — 11,893,560 ￦ (5,198,946 ) 10,026,566 (354,903 ) 4,555 4,477,272 (6) Deferred tax assets (liabilities) recognized in the consolidated statements of financial position as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Deferred tax assets ￦ 1,901,992 10,934,375 Deferred tax liabilities (7,100,938 ) (6,457,103 ) ￦ (5,198,946 ) 4,477,272 (7) Details of deductible temporary differences, tax losses and unused tax credits for which no deferred tax assets were recognized as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Deductible temporary differences ￦ 1,539,980 1,381,532

Assets Held-for-Sale

Assets Held-for-Sale	12 Months Ended
	Dec. 31, 2022
Non-current assets or disposal groups classified as held for sale or as held for distribution to owners [abstract]
Assets Held-for-Sale	42. Assets Held-for-Sale Assets held-for-sale 2021 2022 In millions of won Land (*1,2) ￦ 2,907 31,766 Buildings (*1,2) 12,971 12,981 Structures (*1) 1 1 ￦ 15,879 44,748 (*1) The board of directors of KEPCO Engineering & Construction Company, Inc., a subsidiary of the Company, made a resolution to sell its old office building in Yongin-si, Gyeonggi-do held-for-sale (*2) The board of directors of Korea Electric Power Corporation, the controlling company, made a resolution to sell the Uijeongbu substation during the year ended December 31, 2022, and reclassified the buildings and land as assets held-for-sale expecting its carrying amount would be recovered through a sale transaction.

Expenses Classified by Nature

Expenses Classified by Nature	12 Months Ended
	Dec. 31, 2022
Expenses by nature [abstract]
Expenses Classified by Nature	43. Expenses Classified by Nature Expenses classified by nature for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 Selling and Cost of Total In millions of won Raw materials used ￦ — 13,544,410 13,544,410 Salaries 1,095,183 4,183,454 5,278,637 Retirement benefit expense 103,967 458,029 561,996 Welfare and benefit expense 155,071 484,319 639,390 Insurance expense 10,178 93,130 103,308 Depreciation 218,103 11,151,393 11,369,496 Amortization of intangible assets 87,086 83,380 170,466 Bad debt expense 20,648 — 20648 Commission 368,275 376,047 744,322 Advertising expense 29,559 8,161 37,720 Training expense 5,196 12,912 18,108 Vehicle maintenance expense 9,435 7,161 16,596 Publishing expense 3,677 3,524 7,201 Business promotion expense 3,614 3,720 7,334 Rent expense 36,337 191,073 227,410 Telecommunication expense 8,686 9,961 18,647 Transportation expense 1,007 10,362 11,369 Taxes and dues 62,828 492,203 555,031 Expendable supplies expense 8,029 36,966 44,995 Water, light and heating expense 11,749 31,209 42,958 Repairs and maintenance expense 79,185 2,465,716 2,544,901 Ordinary development expense 197,436 503,206 700,642 Travel expense 10,793 60,896 71,689 Clothing expense 14,834 8,116 22,950 Survey and analysis expense 826 3,746 4,572 Membership fee 1,274 13,130 14,404 Power purchase — 15,725,220 15,725,220 Others 135,467 1,842,735 1,978,202 ￦ 2,678,443 51,804,179 54,482,622 2021 Selling and Cost of Total In millions of won Raw materials used ￦ — 18,660,477 18,660,477 Salaries 1,121,188 4,276,494 5,397,682 Retirement benefit expense 113,127 488,263 601,390 Welfare and benefit expense 155,558 570,440 725,998 Insurance expense 17,909 104,544 122,453 Depreciation 219,427 11,551,897 11,771,324 Amortization of intangible assets 91,428 74,733 166,161 Bad debt expense 17,968 — 17,968 Commission 410,287 307,272 717,559 Advertising expense 29,230 9,552 38,782 Training expense 4,923 13,283 18,206 Vehicle maintenance expense 8,849 8,152 17,001 Publishing expense 3,568 3,310 6,878 Business promotion expense 3,522 3,777 7,299 Rent expense 43,650 194,234 237,884 Telecommunication expense 8,569 10,959 19,528 Transportation expense 870 53,365 54,235 Taxes and dues 93,446 529,380 622,826 Expendable supplies expense 9,052 41,414 50,466 Water, light and heating expense 12,351 43,025 55,376 Repairs and maintenance expense 123,134 2,494,861 2,617,995 Ordinary development expense 213,936 475,461 689,397 Travel expense 11,099 67,103 78,202 Clothing expense 10,540 7,994 18,534 Survey and analysis expense 889 3,992 4,881 Membership fee 1,331 8,492 9,823 Power purchase — 21,619,039 21,619,039 Others 149,945 2,022,777 2,172,722 ￦ 2,875,796 63,644,290 66,520,086 2022 Selling and Cost of sales Total In millions of won Raw materials used ￦ — 34,832,581 34,832,581 Salaries 1,142,360 4,329,099 5,471,459 Retirement benefit expense 109,758 505,612 615,370 Welfare and benefit expense 155,781 540,058 695,839 Insurance expense 20,835 106,672 127,507 Depreciation 244,676 12,056,455 12,301,131 Amortization of intangible assets 85,661 70,499 156,160 Bad debt expense 23,634 — 23,634 Commission 420,390 351,557 771,947 Advertising expense 33,739 10,552 44,291 Training expense 7,327 14,813 22,140 Vehicle maintenance expense 10,749 10,275 21,024 Publishing expense 3,732 3,014 6,746 Business promotion expense 3,198 3,340 6,538 Rent expense 47,680 186,439 234,119 Telecommunication expense 7,945 9,677 17,622 Transportation expense 1,012 113,845 114,857 Taxes and dues 122,177 554,320 676,497 Expendable supplies expense 9,617 47,159 56,776 Water, light and heating expense 17,950 60,002 77,952 Repairs and maintenance expense 152,449 2,586,975 2,739,424 Ordinary development expense 213,932 513,878 727,810 Travel expense 16,062 78,999 95,061 Clothing expense 13,044 8,778 21,822 Survey and analysis expense 1,126 4,322 5,448 Membership fee 1,469 16,912 18,381 Power purchase — 41,984,858 41,984,858 Others 143,119 1,902,903 2,046,022 ￦ 3,009,422 100,903,594 103,913,016

Earnings (Loss) Per Share

Earnings (Loss) Per Share	12 Months Ended
	Dec. 31, 2022
Earnings per share [abstract]
Earnings (Loss) Per Share	44. Earnings (Loss) Per Share (1) Basic earnings (loss) per share for the years ended December 31, 2020, 2021 and 2022 are as follows: Type 2020 2021 2022 In won Basic earnings (loss) per share ￦ 3,102 (8,263 ) (38,112 ) (2) Diluted earnings (loss) per share for the years ended December 31, 2020, 2021 and 2022 are as follows: Type 2020 2021 2022 In won Diluted earnings (loss) per share ￦ 3,102 (8,263 ) (38,112 ) (3) Basic earnings (loss) per share Profit (loss) for the year and weighted average number of common shares used in the calculation of basic earnings (loss) per share for the years ended December 31, 2020, 2021 and 2022 are as follows: Type 2020 2021 2022 In millions of won except number of shares Profit (loss) attributable to owners of the controlling company ￦ 1,991,347 (5,304,522 ) (24,466,853 ) Profit (loss) used in the calculation of total basic earnings (loss) per share 1,991,347 (5,304,522 ) (24,466,853 ) Weighted average number of common shares 641,964,077 641,964,077 641,964,077 (4) Diluted earnings (loss) per share Diluted earnings (loss) per share is calculated by applying adjusted weighted average number of common shares under the assumption that all dilutive potential common shares are converted to common shares. Profit (loss) used in the calculation of total diluted earnings (loss) per share for the years ended December 31, 2020, 2021 and 2022 are as follows: Type 2020 2021 2022 In millions of won Profit (loss) used in the calculation of total diluted earnings (loss) per share ￦ 1,991,347 (5,304,522 ) (24,466,853 ) Weighted average number of common shares used in calculating diluted earnings (loss) per share are adjusted from weighted average number of common shares used in calculating basic earnings (loss) per share. Detailed information of the adjustment for the years ended December 31, 2020, 2021 and 2022 are as follows: Type 2020 2021 2022 In number of shares Weighted average number of common shares 641,964,077 641,964,077 641,964,077 Diluted weighted average number of shares 641,964,077 641,964,077 641,964,077 (5) There are no potential dilutive instruments, thus diluted earnings (loss) per share are same as basic earnings (loss) per share for the years ended December 31, 2020, 2021 and 2022.

Risk Management

Risk Management	12 Months Ended
	Dec. 31, 2022
Risk Management [Abstract]
Risk Management	45. Risk Management (1) Capital risk management The Company manages its capital to ensure that entities in the Company will be able to continue while maximizing the return to shareholder through the optimization of the debt and equity balance. The capital structure of the Company consists of net debt (offset by cash and cash equivalents) and equity. The Company’s overall capital risk management strategy remains consistent with the prior year. (1) Capital risk management, continued Details of the Company’s capital management accounts as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Total borrowings and debt securities ￦ 80,529,513 120,605,365 Cash and cash equivalents 2,635,238 3,234,780 Net borrowings and debt securities 77,894,275 117,370,585 Total equity 65,326,706 42,000,256 Debt to equity ratio 119.24 % 279.45 % (2) Financial risk management The Company is exposed to various risks related to its financial instruments, such as, market risk (currency risk, interest rate risk, price risk), credit risk. The Company monitors and manages the financial risks relating to the operations of the Company through internal risk reports which analyze exposures by degree and magnitude of risks. The Company uses derivative financial instruments to hedge certain risk exposures. The Company’s overall financial risk management strategy remains consistent with the prior year. (i) Credit risk Credit risk is the risk of finance loss to the Company if a customer or counterparty to a financial instrument fails to meet its contractual obligations, and arises primarily from the sales activities, securities and derivatives. In addition, credit risk exposure may exist within financial guarantees and unused line of credits. As these financial institutions the Company makes transactions with are reputable financial institutions, the credit risk from them are considered limited. The Company decides credit transaction limits based on evaluation of client’s credit, through information obtained from the credit bureau and disclosed financial position at committing contracts. ① Credit risk management Electricity sales, the main operations of the Company are the necessity for daily life and industrial activities of Korean nationals and have importance as one of the national key industries. The Company dominates the domestic market supplying electricity to customers. The Company is not exposed to significant credit risk as customers of the Company are diverse and are from various industries and areas. The Company uses publicly available information and its own internal data related to trade receivables, to rate its major customers and to measure the credit risk that a counter party will default on a contractual obligation. For the incurred but not recognized loss, it is measured considering overdue period. ② Impairment and allowance account In accordance with the Company policies, individual material financial assets are assessed on a regular basis, trade receivables that are assessed not to be impaired individually are, in addition, assessed for impairment on a collective basis. Value of the acquired collateral (including the confirmation of feasibility) and estimated collectable amounts are included in this assessment. Allowance for bad debts assessed on a collective basis are recognized for (i) the group of assets which individually are not material and (ii) incurred but not recognized losses that are assessed using statistical methods, judgment and past experience. Book values of the financial assets represent the maximum exposed amounts of the credit risk. Details of the Company’s level of maximum exposure to credit risk as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Cash and cash equivalents ￦ 2,635,238 3,234,780 Financial assets at fair value through profit or loss(*1) 932,736 3,610,408 Derivative assets (trading) 443,027 693,072 Financial assets at fair value through other comprehensive income (debt securities) 491 529 Financial assets at amortized cost 25,273 26,998 Loans 909,071 1,013,371 Long-term/short-term financial instruments 1,728,508 1,353,080 Derivative assets (applying hedge accounting) 204,756 324,952 Trade and other receivables 10,029,276 12,614,902 Financial guarantee contracts(*2) 3,718,015 3,776,060 (*1) Equity investments held by the Company are excluded. (*2) Maximum exposure associated with the financial guarantee contracts is the maximum amounts of the obligation. As of the reporting date, there are no financial assets and non-financial (ii) Market risk Market risk is the risk that the Company’s fair values of the financial instruments or future cash flows are affected by the changes in the market. Market risk consists of interest rate risk, foreign currency risk and other price risk. (iii) Sensitivity analysis Significant assets and liabilities with uncertainties in underlying assumptions ① Defined benefit obligation A sensitivity analysis of defined benefit obligation assuming a 1% increase and decrease movements in the actuarial valuation assumptions as of December 31, 2021 and 2022 are as follows: 2021 2022 Type Accounts 1% Increase 1% Decrease 1% 1% In millions of won Future salary increases Increase (decrease) in defined benefit obligation ￦ 466,832 (407,554 ) 321,930 (283,658 ) Discount rate Increase (decrease) in (422,290 ) 499,571 (289,229 ) 337,033 Changes of employee benefits assuming a 1% increase and decrease movements in discount rate on plan asset for the years ended December 31, 2021 and 2022 are ￦25,649 million and ￦27,495 million, respectively. ② Provisions Changes in provisions due to movements in underlying assumptions as of December 31, 2021 and 2022 are as follows: Type Accounts 2021 2022 PCBs Inflation rate 1.37 % 1.98 % Discount rate 1.88 % 1.92 % Nuclear plants Inflation rate 1.41 % 2.25 % Discount rate 2.20 % 2.48 % Spent fuel Inflation rate 2.93 % 2.93 % Discount rate 4.49 % 4.49 % Radioactive waste Inflation rate 1.00 % 3.06 % Discount rate 1.87 % 2.62 % A sensitivity analysis of provisions assuming a 0.1% increase and decrease movements in the underlying assumptions as of December 31, 2021 and 2022 are as follows: 2021 2022 Type Accounts 0.1% Increase 0.1% Decrease 0.1% Increase 0.1% Decrease In millions of won Discount rate PCBs ￦ (222 ) 223 (169 ) 169 Nuclear plants (369,540 ) 381,026 (474,432 ) 491,360 Spent fuel (51,430 ) 53,438 (54,330 ) 56,453 Radioactive waste (11,201 ) 11,306 (15,089 ) 15,260 Inflation rate PCBs 224 (224 ) 169 (169 ) Nuclear plants 403,420 (391,754 ) 515,262 (498,258 ) Spent fuel 54,210 (52,245 ) 57,269 (55,191 ) Radioactive waste 10,366 (10,288 ) 14,190 14,056 Management judgment effected by uncertainties in underlying assumptions ① Foreign currency risk The Company undertakes transactions denominated in foreign currencies; consequently, exposures to exchange rate fluctuations arise. The carrying amounts of the Company’s foreign currency denominated monetary assets and monetary liabilities as of December 31, 2021 and 2022 are as follows: Assets Liabilities Type 2021 2022 2021 2022 In thousands of foreign currencies AED 6,481 5,610 31,637 25,597 AUD 3,733 4,448 926,960 299,663 BDT 50,145 7,514 577 — BWP 939 824 — — EGP — — 595 1,162 CAD 582 89 2,266 595 CHF — — 500,230 500,158 CZK — — 386 153 EUR 1,809 1,976 42,981 41,073 GBP — — — 31 HKD — — 1,651,665 4,014,446 IDR 768,731 598,697 995,510 1,323,840 INR 1,715,900 1,592,380 342,833 312,978 JOD 1,852 1,146 118 14 JPY 697,747 568,263 153,383 1,719,846 KZT 1,510 1,510 — — MGA 4,262,857 2,856,045 475,807 347,403 MMK 210,335 199,518 — — MYR 1,964 38,177 — — PHP 164,167 68,592 104,245 7,493 PKR 200,844 533,816 74,423 219,341 RUB — — — 2,881 SAR 2,615 1,713 — 9,710 SEK — — 449,167 449,211 THB — — — 389 USD 1,381,441 1,484,614 12,023,085 13,599,643 UYU 90,930 128,674 3,097 3,106 VND 952,135 1,184,670 262,372 4,495 ZAR 31,971 43,461 — — A sensitivity analysis on the Company’s income for the period assuming a 10% increase and decrease in currency exchange rates as of December 31, 2021 and 2022 are as follows: 2021 2022 Type 10% Increase 10% Decrease 10% Increase 10% Decrease In millions of won Increase (decrease) of profit before income tax ￦ (1,439,185 ) 1,439,185 (1,703,053 ) 1,703,053 Increase (decrease) of equity(*) (1,439,185 ) 1,439,185 (1,703,053 ) 1,703,053 (*) The effect on the shareholders’ equity excluding the impact of income taxes. The sensitivity analysis above is conducted for monetary assets and liabilities denominated in foreign currencies other than functional currency, without consideration of hedge effect of related derivatives, as of December 31, 2021 and 2022. To manage its foreign currency risk related to foreign currency denominated receivables and payables, the Company has a policy to enter into currency forward agreements. In addition, to manage its foreign currency risk related to foreign currency denominated expected sales transactions and purchase transactions, the Company enters into currency forward agreements. There is an economic relationship between the hedged item and the hedging instrument as the terms of cross-currency swap agreement is consistent with the terms of expected transaction (repayment of foreign debt securities and others). The hedging ratio is 1:1 as the risk of cross-currency swap agreement matches the hedged instrument. As of December 31, 2022, the hedging instrument (cross-currency swap) hedges the risk of the hedged item(repayment of foreign debt securities and others). ② Interest rate risk The Company is exposed to interest rate risk due to its borrowing with floating interest rates. A 1% increase or decrease is used when reporting interest rate risk internally to key management personnel and represents management’s assessment of the reasonably possible change in interest rates. The Company’s borrowings and debt securities with floating interest rates as of December 31, 2021 and 2022 are as follows: Type 2021 2022 In millions of won Short-term borrowings ￦ 391,897 3,154,972 Long-term borrowings 2,405,244 5,388,073 Debt securities 257,667 269,101 ￦ 3,054,808 8,812,146 A sensitivity analysis on the Company’s long-term borrowings and debt securities assuming a 1% increase and decrease in interest rates, without consideration of hedge effect of related derivatives for the years ended December 31, 2021 and 2022 are as follows: 2021 2022 Type 1% Increase 1% Decrease 1% 1% In millions of won Increase (decrease) of profit before income tax ￦ (30,548 ) 30,548 (88,121 ) 88,121 Increase (decrease) of shareholder’s equity(*) (30,548 ) 30,548 (88,121 ) 88,121 (*) The effect on the shareholders’ equity excluding the impact of income taxes. The Company manages its interest rate risk by having a balanced portfolio of fixed and variable rate loans and borrowings. To manage this, the Company enters into interest rate swaps, in which it agrees to exchange, at specified intervals, the difference between fixed and variable rate interest amounts calculated by reference to an agreed-upon notional principal amount. The above analysis measures the interest rate risk before reflecting the hedge effect by related derivatives. ③ Electricity rates risk The Company is exposed to electricity rates risk due to changes in government regulations and policies on national power supply schemes and electricity billing rates, in consideration of the national economy. A sensitivity analysis on the Company’s income for the period assuming a 1% increase and decrease in price of electricity for the years ended December 31, 2021 and 2022 is as follows: 2021 2022 Type 1% Increase 1% Decrease 1% Increase 1% Decrease In millions of won Increase (decrease) of profit before income tax ￦ 573,086 (573,086 ) 661,990 (661,990 ) Increase (decrease) of shareholder’s equity(*) 573,086 (573,086 ) 661,990 (661,990 ) (*) The effect on the equity excluding the impact of income taxes. (iv) Liquidity risk The Company has established an appropriate liquidity risk management framework for the management of the Company’s short, medium and long-term funding and liquidity management requirements. The Company manages liquidity risk by continuously monitoring forecasted and actual cash flows, and by matching the maturity profiles of financial assets and liabilities. In addition, the Company has established credit lines on its trade financing and bank overdrafts, and through payment guarantees it has received, it maintains an adequate credit (borrowing) line. In addition, the Company has the ability to utilize excess cash or long-term borrowings for major construction investments. The expected maturities for non-derivative 2021 Type Less than 1 year 1~2 Years 2~5 Years More than 5 years Total In millions of won Borrowings and debt securities ￦ 15,833,589 11,229,657 28,663,693 36,223,543 91,950,482 Lease liabilities 620,121 636,724 1,521,421 2,150,722 4,928,988 Trade and other payables 7,569,869 777,017 725,231 667,304 9,739,421 Financial guarantee contracts(*) 435,729 — 3,105,599 176,687 3,718,015 ￦ 24,459,308 12,643,398 34,015,944 39,218,256 110,336,906 2022 Type Less than 1 year 1~2 Years 2~5 Years More than 5 years Total In millions of won Borrowings and debt securities ￦ 26,157,747 27,367,577 47,361,676 37,115,832 138,002,832 Lease liabilities 639,756 657,210 1,390,374 1,925,012 4,612,352 Trade and other payables 11,369,512 347,563 1,008,133 734,112 13,459,320 Financial guarantee contracts(*) 105,091 54,310 3,495,437 121,222 3,776,060 ￦ 38,272,106 28,426,660 53,255,620 39,896,178 159,850,564 (*) This represents the total guarantee amounts associated with the financial guarantee contracts. Financial guarantee liabilities which are recognized as of December 31, 2021 and 2022 are ￦80,841 million and ￦67,240 million, respectively. The following table shows the details of maturities of non-derivative non-derivative The expected maturities for non-derivative 2021 Type Less than 1 year 1~5 Years More than 5 years Other(*) Total In millions of won Cash and cash equivalents ￦ 2,635,238 — — — 2,635,238 Financial assets at fair value through other comprehensive income — — — 435,107 435,107 Financial assets at amortized cost 15,422 9,840 11 — 25,273 Loans 88,396 443,146 407,584 — 939,126 Long-term/short-term financial instruments 1,278,014 171,636 286 278,572 1,728,508 Financial assets at fair value through profit or loss 360,833 346 3,130 668,555 1,032,864 Trade and other receivables 8,123,455 1,233,703 679,048 — 10,036,206 ￦ 12,501,358 1,858,671 1,090,059 1,382,234 16,832,322 2022 Type Less than 1 year 1~5 Years More than 5 years Other(*) Total In millions of won Cash and cash equivalents ￦ 3,234,780 — — — 3,234,780 Financial assets at fair value through other comprehensive income — — 502,829 502,829 Financial assets at amortized cost 16,762 10,231 5 — 26,998 Loans 132,877 411,594 502,050 — 1,046,521 Long-term/short-term financial instruments 666,758 — 25 686,297 1,353,080 Financial assets at fair value through profit or loss 3,181,791 645 3,535 523,537 3,709,508 Trade and other receivables 10,464,191 1,083,593 1,080,831 — 12,628,615 ￦ 17,697,159 1,506,063 1,586,446 1,712,663 22,502,331 (*) The maturities cannot be presently determined. Derivative liabilities classified by maturity periods which from reporting date to maturity dates as per the contracts as of December 31, 2021 and 2022 are as follows: 2021 Type Less than 1 year 1~2 Years 2~5 Years More than 5 years Total In millions of won Net settlement —Trading ￦ — — — — — Gross settlement —Trading and others (6,628 ) (4,954 ) (33,635 ) (2,291 ) (47,508 ) —Hedging (2,555 ) (638 ) (1,914 ) (23,704 ) (28,811 ) ￦ (9,183 ) (5,592 ) (35,549 ) (25,995 ) (76,319 ) 2022 Type Less than 1 year 1~2 Years 2~5 Years More than 5 years Total In millions of won Net settlement —Trading ￦ — — — — — Gross settlement —Trading and others (42,663 ) (15,225 ) (171,130 ) (84,924 ) (313,942 ) —Hedging — (10,064 ) (5,176 ) (10,265 ) (25,505 ) ￦ (42,663 ) (25,289 ) (176,306 ) (95,189 ) (339,447 ) Derivative assets classified by maturity periods which from reporting date to maturity dates as per the contracts as of December 31, 2021 and 2022 are as follows: 2021 Type Less than 1 year 1~2 Years 2~5 Years More than 5 years Total In millions of won Net settlement —Trading ￦ — — — — — Gross settlement —Trading 93,554 54,617 202,663 105,856 456,690 —Hedging 33,564 65,198 102,760 3,235 204,757 ￦ 127,118 119,815 305,423 109,091 661,447 2022 Type Less than 1 year 1~2 Years 2~5 Years More than 5 years Total In millions of won Net settlement —Trading ￦ — — — — — Gross settlement —Trading 861,621 160,938 (352,657 ) 65,661 735,563 —Hedging 134,390 47,502 131,258 — 313,150 ￦ 996,011 208,440 (221,399 ) 65,661 1,048,713 (3) Fair value risk The fair value of the Company’s actively-traded financial instruments (i.e., FVTPL, FVOCI, etc.) is based on the traded market-price as of the reporting period end. The fair value of the Company’s financial assets is the amount which the asset could be exchanged for or the amount a liability could be settled for. The fair values of financial instruments where no active market exists or where quoted prices are not otherwise available are determined by using valuation techniques. Valuation techniques include using recent arm’s length market transactions between knowledgeable, willing parties, if available, reference to the current fair value of another instrument that is substantially the same, discounted cash flow analysis and option pricing models. If there is a valuation technique commonly used by market participants to price the instrument and that technique has been demonstrated to provide reliable estimates of prices obtained in actual market transactions, the Company uses that technique. For trade receivables and payables, the Company considers the carrying value net of impairment as fair value. While for disclosure purposes, the fair value of financial liabilities is estimated by discounting the future contractual cash flows based on current market interest rates applied to similar financial instruments. (i) Fair value and book value of financial assets and liabilities as of December 31, 2021 and 2022 are as follows: 2021 2022 Type Book value Fair value Book value Fair value In millions of won Assets recognized at fair value Financial assets at fair value through other comprehensive income ￦ 435,107 435,107 502,829 502,829 Derivative assets (trading) 443,027 443,027 693,072 693,072 Derivative assets (hedge designated) 204,756 204,756 324,952 324,952 Financial assets at fair value through profit or loss 1,032,864 1,032,864 3,709,508 3,709,508 ￦ 2,115,754 2,115,754 5,230,361 5,230,361 Assets carried at amortized cost Financial assets at amortized cost ￦ 25,273 25,273 26,998 26,998 Loans and receivables 909,071 909,071 1,013,371 1,013,371 Trade and other receivables 10,029,276 10,029,276 12,614,902 12,614,902 Long-term financial instruments 450,494 450,494 686,322 686,322 Short-term financial instruments 1,278,014 1,278,014 666,758 666,758 Cash and cash equivalents 2,635,238 2,635,238 3,234,780 3,234,780 ￦ 15,327,366 15,327,366 18,243,131 18,243,131 Liabilities recognized at fair value Derivative liabilities (trading) ￦ 56,256 56,256 407,246 407,246 Derivative liabilities (hedge designated) 21,775 21,775 25,505 25,505 ￦ 78,031 78,031 432,751 432,751 Liabilities carried at amortized cost Secured borrowings ￦ 176,358 176,358 102,368 102,368 Unsecured bond 73,881,671 69,803,043 105,185,189 96,846,056 Lease liabilities 4,410,503 4,410,503 4,163,143 4,163,143 Unsecured borrowings 6,471,484 5,938,613 15,282,193 15,280,693 Trade and other payables(*) 9,739,421 9,739,421 13,459,320 13,459,320 Bank overdraft — — 35,615 35,615 ￦ 94,679,437 90,067,938 138,227,828 129,887,195 (*) Excludes lease liabilities. (ii) Interest rates used for determining fair value The interest rates used to discount estimated cash flows, when applicable, are based on the government yield curve at the reporting date plus an adequate credit spread. The discount rates used for calculating fair value as of December 31, 2021 and 2022 are as follows: Type 2021 2022 Derivatives (-) 0.63% ~ 3.88% 0.60% ~ 7.93% Borrowings and debt securities (-) 0.30% ~ 4.38% 0.75% ~ 5.84% Finance lease 0.00% ~ 16.83% 0.00% ~ 17.08% (iii) Fair value hierarchy The following table provides an analysis of financial instruments that are measured subsequent to initial recognition at fair value, classified as Level 1, 2 or 3, based on the degree to which the fair value is observable. Level 1: Unadjusted quoted prices in active markets for identical assets or liabilities; Level 2: Inputs other than quoted prices that are observable for the asset or liability either directly or indirectly; and Level 3: Inputs that are not based on observable market data. Fair values of financial instruments by hierarchy level as of December 31, 2021 and 2022 are as follows: 2021 Type Level 1 Level 2 Level 3 Total In millions of won Financial assets at fair value Financial assets at fair value through other comprehensive income ￦ 273,826 — 161,281 435,107 Derivative assets — 647,783 — 647,783 Financial assets at fair value through profit or loss — 1,027,067 5,797 1,032,864 ￦ 273,826 1,674,850 167,078 2,115,754 Financial liabilities at fair value Derivative liabilities ￦ — 78,031 — 78,031 2022 Type Level 1 Level 2 Level 3 Total In millions of won Financial assets at fair value Financial assets at fair value through other comprehensive income ￦ 300,057 — 202,772 502,829 Derivative assets — 1,018,024 — 1,018,024 Financial assets at fair value through profit or loss — 3,703,179 6,329 3,709,508 ￦ 300,057 4,721,203 209,101 5,230,361 Financial liabilities at fair value Derivative liabilities ￦ — 432,751 — 432,751 The fair value of financial assets (FVTPL and FVOCI) publicly traded is measured at the closing bid price quoted at the end of the reporting period. Meanwhile, the fair value of unquoted financial assets (FVTPL and FVOCI) is calculated using the valuation results from an external pricing service in which weighted average borrowing rates of interest of evaluated companies are used as a discount rate. The fair value of derivatives is measured using valuation model which is determined at the present value of estimated future cash flows discounted at current market interest rate. Changes of financial assets and liabilities which are classified as level 3 for the years ended December 31, 2021 and 2022 are as follows: 2021 Beginning Acquisitions Reclassified Valuation Disposal Foreign Ending In millions of won Financial assets at fair value Financial assets at fair value through profit or loss Cooperative ￦ 5,692 — — 105 — — 5,797 Financial assets at fair value through other comprehensive income Unlisted securities 163,889 8,929 — (12,335 ) (13 ) 320 160,790 Debt securities — 500 — — — (9 ) 491 2022 Beginning Acquisitions Reclassified Valuation Disposal Foreign Ending In millions of won Financial assets at fair value Financial assets at fair value through profit or loss Cooperative ￦ 5,797 400 — 132 — — 6,329 Financial assets at fair value through other comprehensive income Unlisted securities 160,790 9,451 — 33,237 — (1,235 ) 202,243 Debt securities 491 — — 38 — — 529

Service Concession Arrangements

Service Concession Arrangements	12 Months Ended
	Dec. 31, 2022
Disclosure of detailed information about service concession arrangements [abstract]
Service Concession Arrangements	46. Service Concession Arrangements (i) Significant terms and concession period of the arrangement The Company has entered into a contract with PT. Perusahaan Listrik Negara (the “PT PLN”) whereby the Company provides electricity generated and charge tariff rates designed to recover capital cost, fixed O&M cost, water usage cost, variable O&M cost and special facilities cost during the concession period after building, rehabilitating, and operating the power plant for approximately 30 years (2018~2048) subsequent to the completion of plant construction. (ii) Rights and classification of the arrangement The Company has the rights to use and own the power plant during the concession period from 2018 to 2048. At the end of the concession period, PT PLN has an option to take over the ownership of the power plant from the Company. (iii) Classification method This project allows PT PLN to acquire ownership of the plant after the end of the 30-years contract period (iv) The Company’s expected future collections of service concession arrangements as of December 31, 2022 are as follows: Type Amounts In millions of won Less than 1 year ￦ 31,653 1 ~ 2 years 31,800 2 ~ 3 years 31,728 Over 3 years 548,400 ￦ 643,581

Related Parties

Related Parties	12 Months Ended
	Dec. 31, 2022
Disclosure of transactions between related parties [abstract]
Related Parties	47. Related Parties (1) Related parties of the Company as of December 31, 2022 are as follows: Type Related party Parent Republic of Korea government Subsidiaries (161 subsidiaries) Korea Hydro & Nuclear Power Co., Ltd., Korea South-East Power Co., Ltd., Korea Midland Power Co., Ltd., Korea Western Power Co., Ltd., Korea Southern Power Co., Ltd., Korea East-West Power Co., Ltd., KEPCO Engineering & Construction Company, Inc., KEPCO Plant Service & Engineering Co., Ltd., KEPCO Nuclear Fuel Co., Ltd., KEPCO KDN Co., Ltd., Gyeonggi Green Energy Co., Ltd., Korea Offshore Wind Power Co., Ltd., KOSEP Material Co., Ltd., KEPCO International HongKong Ltd., KEPCO International Philippines Inc., KEPCO Philippines Corporation, KEPCO Ilijan Corporation, KEPCO Gansu International Ltd., KEPCO Philippines Holdings Inc., KEPCO Lebanon SARL, KEPCO Neimenggu International Ltd., KEPCO Australia Pty., Ltd., KEPCO Shanxi International Ltd., KOMIPO Global Pte Ltd., KOSEP Australia Pty., Ltd., KOMIPO Australia Pty., Ltd., KOWEPO Australia Pty., Ltd., KOSPO Australia Pty., Ltd., KEPCO Netherlands B.V., KEPCO Middle East Holding Company, Qatrana Electric Power Company, KOWEPO International Corporation, KOSPO Jordan LLC, Korea Waterbury Uranium Limited Partnership, PT. Cirebon Power Service, EWP America Inc., KHNP Canada Energy Ltd., KEPCO Bylong Australia Pty., Ltd., KNF Canada Energy Limited, KEPCO Holdings de Mexico, KST Electric Power Company, S.A.P.I. de C.V., KEPCO Energy Service Company, KEPCO Netherlands S3 B.V., PT. KOMIPO Pembangkitan Jawa Bali, EWP Barbados 1 SRL, PT. Tanggamus Electric Power, KOMIPO America Inc., PT. EWP Indonesia, KEPCO Netherlands J3 B.V., Global One Pioneer B.V., Global Energy Pioneer B.V., Mira Power Limited, KEPCO KPS Philippines Corp., KOSPO Chile SpA, PT. KOWEPO Sumsel Operation And Maintenance Services, Commerce and Industry Energy Co., Ltd., Gyeongju Wind Power Co., Ltd., California Power Holdings, LLC, EWP Renewable Corporation, Hee Mang Sunlight Power Co., Ltd., Fujeij Wind Power Company, KOSPO Youngnam Power Co., Ltd., Chitose Solar Power Plant LLC., KEPCO Solar Co., Ltd., KEPCO Energy Solution Co., Ltd., KOSPO Power Services Ltda., KOEN Bylong Pty., Ltd., KOWEPO Bylong Pty., Ltd., KOSPO Bylong Pty., Ltd., EWP Bylong Pty., Ltd., KOWEPO Lao International, KOMIPO Bylong Pty., Ltd., Energy New Industry Specialized Investment Private Investment Trust., KEPCO US Inc., KEPCO Mangilao Holdings LLC, Mangilao Investment LLC, KEPCO Mangilao Solar, LLC, Jeju Hanlim Offshore Wind Co., Ltd., PT. Siborpa Eco Power, e-New e-New E-New E-New Associates (96 associates) Dongducheon Dream Power Co., Ltd., Korea Gas Corporation, Daegu Photovoltaic Co., Ltd., Haeng Bok Do Si Photovoltaic Power Co., Ltd., Korea Electric Power Industrial Development Co., Ltd., Goseong Green Power Co., Ltd., Gangneung Eco Power Co., Ltd., Shin Pyeongtaek Power Co., Ltd., Noeul Green Energy Co., Ltd., YTN Co., Ltd., Samcheok Eco Materials Co., Ltd., Gangwon Wind Power Co., Ltd., Gwangyang Green Energy Co., Ltd., Hyundai Green Power Co., Ltd., Korea Power Exchange, Taebaek Wind Power Co., Ltd., Taebaek Guinemi Wind Power Co., Ltd., Daeryun Power Co., Ltd., KNH Solar Co., Ltd., S-Power Xe-Pian Xe-Namnoy Type Related party Joint ventures (105 joint ventures) Daegu Green Power Co., Ltd., KEPCO SPC Power Corporation, KAPES, Inc., Honam Wind Power Co., Ltd., Korea Power Engineering Service Co., Ltd., Seokmun Energy Co., Ltd., Incheon New Power Co., Ltd., Chun-cheon Energy Co., Ltd., Yeonggwangbaeksu Wind Power Co., Ltd., KW Nuclear Components Co., Ltd., KEPCO-Uhde Inc., Busan Shinho Solar Power Co., Ltd., Global Trade Of Power System Co., Ltd., Expressway Solar-light Power Generation Co., Ltd., Gansu Datang Yumen Wind Power Co., Ltd., Datang Chifeng Renewable Power Co., Ltd., Rabigh Electricity Company, Rabigh Operation & Maintenance Company Limited, Datang KEPCO Chaoyang Renewable Power Co., Ltd., Shuweihat Asia Power Investment B.V., Shuweihat Asia Operation & Maintenance Company, Waterbury Lake Uranium L.P., ASM-BG NH-Amundi Shin-han Other Korea Development Bank (2) Transactions between the Company and its subsidiaries are eliminated during the consolidation and are not disclosed in notes. (3) Related party transactions for the years ended December 31, 2020, 2021 and 2022 are as follows: <Sales and Others> Sales and others Company name Transaction type 2020 2021 2022 In millions of won <Associates> Dongducheon Dream Power Co., Ltd. Electricity sales ￦ 7,757 19,923 8,942 Saemangeum Sebit Power Plant Co., Ltd. Electricity sales — — 1,418 Korea Gas Corporation Electricity sales 97,685 96,362 155,309 Daejung Offshore Wind Power Co., Ltd. Electricity sales 32 46 46 Daegu Photovoltaic Co., Ltd. Electricity sales 325 207 268 Haeng Bok Do Si Photovoltaic Power Co., Ltd. Electricity sales 2 2 2 Korea Electric Power Industrial Development Co., Ltd. Service 10,833 11,208 10,369 Goseong Green Power Co., Ltd. Fuel sales 47,701 514,470 1,062,108 Gangneung Eco Power Co., Ltd. Fuel sales 10,178 14,200 459,404 Shin Pyeongtaek Power Co., Ltd. Electricity sales 20,791 23,501 27,486 Noeul Green Energy Co., Ltd. Electricity sales 30 30 9,396 Samcheok Eco Materials Co., Ltd. Electricity sales 700 620 546 YTN Co., Ltd. Electricity sales 1,805 1,922 2,180 Busan Green Energy Co., Ltd. Electricity sales 34 49 5,055 Gunsan Bio Energy Co., Ltd. Electricity sales 102 20 — Korea Electric Vehicle Charging Service (*2) Electricity sales 1,956 3,039 3,686 Energy Infra Asset Management Co., Ltd. Electricity sales — 4,629 — Gangwon Wind Power Co., Ltd. Electricity sales 2,109 1,865 1,549 Gwangyang Green Energy Co., Ltd. Electricity sales 23 486 1,848 Bigeum Resident Photovoltaic Power Co., Ltd. Electricity sales 85 755 660 Hyundai Green Power Co., Ltd. Electricity sales and design 17,257 11,934 7,063 Korea Power Exchange Service 25,919 39,796 16,596 Taebaek Wind Power Co., Ltd. Service 226 44 861 Taebaek Guinemi Wind Power Co., Ltd. Electricity sales 37 26 — Pyeongchang Wind Power Co., Ltd. Electricity sales 2,064 1,180 1,323 Daeryun Power Co., Ltd. Electricity sales 1,947 1,944 2,016 Changjuk Wind Power Co., Ltd. (*) Electricity sales 2,067 463 1,350 GS Donghae Electric Power Co., Ltd. Electricity sales 31,557 21,127 5,238 KNH Solar Co., Ltd. Electricity sales 16 14 13 S-Power Co., Ltd. Service 6,682 5,229 4,588 Chuncheon Green Energy Co., Ltd. Electricity sales — — 2 PND solar Co., Ltd. Electricity sales 409 416 427 Hyundai Eco Energy Co., Ltd. Electricity sales 167 187 277 YeongGwang Yaksu Wind Electric Co., Ltd. Electricity sales 77 78 66 Taebaek Gadeoksan Wind Power Co., Ltd. Electricity sales — 295 1,952 Korea Energy Solutions Co., Ltd. Electricity sales 7 2 2 ITR Co., Ltd. Service — 3 6 Structure test network Co., Ltd. Service — 5 7 <Sales and Others>, continued Sales and others Company name Transaction type 2020 2021 2022 In millions of won <Associates> Namjeongsusang Solar Power Operation Co., Ltd. Electricity sales ￦ 14 22 21 Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 Service 291 399 394 Bitgoel Eco Energy Co., Ltd. Electricity sales — 282 1,397 Jeju Gimnyeong Wind Power Co., Ltd. Electricity sales — — 367 Seoroseoro Sunny Power Plant Co., Ltd. Electricity sales — — 1 Muan Solar park Co., Ltd. Electricity sales 57 232 950 YuDang Solar Co., Ltd. Electricity sales — — 160 Anjwa Smart Farm & Solar City Co., Ltd. Electricity sales — 624 1,068 Daewon Green Energy Co., Ltd. Electricity sales — 155 185 Saemangeum Heemang Photovoltaic Co., Ltd. Electricity sales — 13 5,740 UD4M Co., Ltd. Electricity sales — 4 2 Dongbu Highway Solar Co., Ltd. Electricity sales — 5 8 Seobu Highway Solar Co., Ltd. Electricity sales — 8 8 SureDataLab Co., Ltd. Electricity sales — 1 1 Suwon New Power Co., Ltd. Electricity sales 2,974 1,820 118 Hankook Electric Power Information Co., Ltd. Electricity sales — 1 — Kosture Co., Ltd. Electricity sales — 1 5 PlatformN. Co., Ltd. Others — — 14 Muan Sunshine Solar Power Plant Co., Ltd. Electricity sales 30 52 17 Gangneung Sacheon Fuel Cell Co., Ltd. Electricity sales — — 151 12 Associates (Overseas) Electricity sales 66,755 125,723 548,507 <Joint ventures> Seobusambo highway photovoltaics Co., Ltd. Electricity sales — — 3 Naepo Green Energy Co., Ltd. Electricity sales 217 467 761 Cheongna Energy Co., Ltd. Others 13,791 16,469 39,802 Dayone Energy Co., Ltd. Service 4,816 8,159 7,761 Daegu Green Power Co., Ltd. Electricity sales 1,285 1,053 1,190 Prime Swedish Holding AB Electricity sales — — 284 KAPES, Inc. Commission 476 413 450 Honam Wind Power Co., Ltd. Electricity sales 502 71 242 Jeongam Wind Power Co., Ltd. Electricity sales 1,213 588 — Korea Power Engineering Service Co., Ltd. Service 203 339 268 Seokmun Energy Co., Ltd. Service 1,932 1,701 1,685 Incheon New Power Co., Ltd. Construction 14 14 14 Chun-cheon Energy Co., Ltd. Electricity sales 2,657 2,329 2,505 Yeonggwangbaeksu Wind Power Co., Ltd. Electricity sales 1,788 1,836 1,898 Yeonggwang Wind Power Co., Ltd. Electricity sales 793 818 871 Western Power Changgi Solar Co., Ltd. (formerly, Sam-Yang Electricity sales 33 1,920 — NH-Amundi Service 1,388 1,727 1,415 <Sales and Others>, continued Sales and others Company name Transaction type 2020 2021 2022 In millions of won KW Nuclear Components Co., Ltd. Service ￦ 1,639 2,598 1,624 KEPCO-Uhde Inc. Electricity sales 8 10 12 Busan Shinho Solar Power Co., Ltd. Electricity sales 353 376 502 Goheung New Energy Co., Ltd. Electricity sales — — 141 Gunsan Land Solar Co., Ltd. Electricity sales — — 518 Daesan Green Energy Co., Ltd. Electricity sales 703 523 394 Cheong-Song Noraesan Wind Power Co., Ltd. Electricity sales 29 30 698 Chungsongmeon BongSan wind power Co., Ltd. Electricity sales — 1 1 Saemangeum Solar Power Co., Ltd. Service 2,846 1,141 100 Dangjin Eco Power Co., Ltd. Electricity sales 33 32 32 Energyco Co., Ltd. Electricity sales — 1 463 Hapcheon Floating Photovoltaic Power Plant Inc. Electricity sales — — 544 Busan Industrial Solar Power Co., Ltd. Electricity sales — 9 14 Bitsolar Energy Co., Ltd. Electricity sales 42 296 498 Omisan Wind Power Co., Ltd. Electricity sales — 1 1 Haemodum Solar Co., Ltd. Electricity sales 4 6 42 Yeongam Solar Power Co., Ltd. Electricity sales 165 339 379 Solaseado Solar Power Co., Ltd. Electricity sales 66 2,890 1,851 Cheongju Eco Park Co., Ltd. Electricity sales — — 204 Enel X Midland Photovoltaic, LLC Electricity sales — — 12 Eumseong Eco Park Co., Ltd. Electricity sales — — 2 Geumsungsan Wind Power Co., Ltd. Electricity sales — — 7 37 Joint ventures (Overseas) Electricity sales 831,596 773,291 606,513 <Others> Korea Development Bank Electricity sales 4,248 4,177 4,134 Interest income 3,461 756 2,222 <Purchase and Others> Purchase and others Company name Transaction type 2020 2021 2022 In millions of won <Associates> Dongducheon Dream Power Co., Ltd. Electricity sales ￦ 552,692 750,148 2,244,332 Saemangeum Sebit Power Plant Co., Ltd. Electricity sales — — 23,159 Korea Gas Corporation Fuel purchase 3,270,972 5,646,713 11,996,402 Daegu Photovoltaic Co., Ltd. Electricity sales 3,313 3,532 4,744 Haeng Bok Do Si Photovoltaic Power Co., Ltd. Electricity sales 370 393 563 Korea Electric Power Industrial Development Co., Ltd. Service 212,366 241,925 251,468 Goseong Green Power Co., Ltd. Electricity sales — 987,540 1,905,502 Shin Pyeongtaek Power Co., Ltd. Electricity sales 520,737 653,306 957,294 Noeul Green Energy Co., Ltd. Electricity sales 10,634 10,014 14,176 Samcheok Eco Materials Co., Ltd. Electricity sales 10,713 13,612 12,019 YTN Co., Ltd. Electricity sales 353 388 304 Busan Green Energy Co., Ltd. Electricity sales 18,678 18,996 26,219 Korea Electric Vehicle Charging Service (*2) Electricity sales 581 393 — Energy Infra Asset Management Co., Ltd. Service — 2,657 2,779 Yaksu ESS Co., Ltd. Electricity sales 217 1,715 851 Gangwon Wind Power Co., Ltd. Electricity sales 23,350 19,623 40,130 Goesan Solar park Co., Ltd. Electricity sales — 6,209 7,642 Korea Power Exchange Service 87,361 86,716 93,817 Taebaek Wind Power Co., Ltd. Service and REC 4,003 5,930 7,442 Taebaek Guinemi Wind Power Co., Ltd. Electricity sales 5,023 5,910 6,793 Pyeongchang Wind Power Co., Ltd. Design service and others 3,969 4,099 3,884 Daeryun Power Co., Ltd. Electricity sales 99,523 157,234 428,534 Changjuk Wind Power Co., Ltd. (*1) Electricity sales 6,084 6,213 9,027 GS Donghae Electric Power Co., Ltd. Electricity sales 660,351 760,377 1,035,263 KNH Solar Co., Ltd. Electricity sales 3,564 3,222 4,348 S-Power Service 293,515 608,530 1,091,741 PND Solar Co., Ltd. Electricity sales 5,234 5,502 6,173 Hyundai Eco Energy Co., Ltd. Electricity sales 17,777 25,762 29,209 YeongGwang Yaksu Wind Electric Co., Ltd. Electricity sales 9,151 11,729 7,382 Taebaek Gadeoksan Wind Power Co., Ltd. Electricity sales — 16,360 25,880 Korea Energy Solutions Co., Ltd. Electricity sales — — 102 Green Energy Electricity Generation Co., Ltd. Electricity sales — 1,238 2,962 Namjeongsusang Solar Power Operation Co., Ltd. Electricity sales — 14,286 9,491 Bitgoel Eco Energy Co., Ltd. Service and others — — 930 Jeju Gimnyeong Wind Power Co., Ltd. Electricity sales — 12,833 12,364 Seoroseoro Sunny Power Plant Co., Ltd. REC and others — 217 1,138 Muan Solar Park Co., Ltd. REC and others — 31,017 17,052 YuDang Solar Co., Ltd. REC and others — 3,495 1,915 Anjwa Smart Farm & Solar City Co., Ltd. Electricity sales — 24,601 16,942 Daewon Green Energy Co., Ltd. Others — — 42,651 Saemangeum Heemang Photovoltaic Co., Ltd. Electricity sales — — 1,039 G.GURU Co., Ltd. Electricity sales — — 452 UD4M Co., Ltd. Electricity sales — — 313 Dongbu Highway Solar Co., Ltd. Electricity sales — 2,605 3,516 Seobu Highway Solar Co., Ltd. Electricity sales — 2,936 3,452 Gwangbaek Solar Power Investment Co., Ltd. Electricity sales 373 742 602 PlatformN. Co., Ltd. Others — — 475 Purchase and others Company name Transaction type 2020 2021 2022 In millions of won <Associates> Muan Sunshine Solar Power Plant Co., Ltd. Electricity sales ￦ — 15,900 19,514 12 Associates (Overseas) Electricity sales — 502 101,790 <Joint ventures> Seobusambo highway photovoltaics Co., Ltd. Electricity sales — — 103 Cheongna Energy Co., Ltd. Service 66 57 80 Dayone Energy Co., Ltd. Service 1,120 5,409 13,872 Daegu Green Power Co., Ltd. Electricity sales 215,224 289,052 508,601 KAPES, Inc. Commission 219,673 64,140 9,306 Honam Wind Power Co., Ltd. Electricity sales 4,382 4,807 7,662 Jeongam Wind Power Co., Ltd. Electricity sales 5,982 3,145 — Korea Power Engineering Service Co., Ltd. Service 1,594 1,315 830 Seokmun Energy Co., Ltd. Service 33,164 44,315 60,799 Chun-cheon Energy Co., Ltd. Electricity sales 222,069 327,536 585,689 Yeonggwangbaeksu Wind Power Co., Ltd. Electricity sales 11,232 9,471 13,990 Yeonggwang Wind Power Co., Ltd. Electricity sales 24,103 21,004 31,221 Western Power Changgi Solar Co., Ltd. (formerly, Sam-Yang Electricity sales 3,848 5,852 — KW Nuclear Components Co., Ltd. Service — 96 9,504 Busan Shinho Solar Power Co., Ltd. Electricity sales 7,296 7,895 10,601 Global Trade Of Power System Co., Ltd. Service 337 323 715 Expressway Solar-light Power Generation Co., Ltd. Electricity sales 2,472 3,146 4,016 Gunsan Land Solar Co., Ltd. Electricity sales — — 533 Daesan Green Energy Co., Ltd. Electricity sales 104,854 146,776 129,736 Cheong-Song Noraesan Wind Power Co., Ltd. Electricity sales — — 980 Saemangeum Solar Power Co., Ltd. Electricity sales — 5 1 Dangjin Eco Power Co., Ltd. Electricity sales 3,953 4,139 5,696 Energyco Co., Ltd. Electricity sales — — 7,898 Hapcheon Floating Photovoltaic Power Plant Inc. Service and REC — — 2,526 Busan Industrial Solar Power Co., Ltd. Electricity sales 19 2,815 4,575 Bitsolar Energy Co., Ltd. Electricity sales — 5,703 13,030 Omisan Wind Power Co., Ltd. Electricity sales — 7 — Haemodum Solar Co., Ltd. Electricity sales 967 1,625 2,168 Yeongam Solar Power Co., Ltd. Electricity sales 32,208 47,805 44,745 Samsu Wind Power Co., Ltd. Electricity sales — 2,800 10,605 Solaseado Solar Power Co., Ltd. Electricity sales 28,516 31,031 28,698 Cheongju Eco Park Co., Ltd. Electricity sales — — 94,409 Enel X Midland Photovoltaic, LLC Electricity sales — — 1,871 37 Joint ventures (Overseas) Electricity sales 14,767 54,135 16,859 <Others> Korea Development Bank Interest expense 3,872 2,756 4,208 Dividends paid 17 256,862 12 (*1) Reclassified from a joint venture to a subsidiary during the year ended December 31, 2022. Transactions are made before the reclassification. (*2) The Company has disposed of shares of Korea Electric Vehicle Charging Service during the year ended December 31, 2022, and it is not a related party to the Group as of December 31, 2022. (4) Receivables and payables arising from related party transactions as of December 31, 2021 and 2022 are as follows: Receivables Payables Company name Type 2021 2022 2021 2022 In millions of won <Associates> Dongducheon Dream Power Co., Ltd. Trade receivables ￦ 6,282 592 — — Non-trade 493 270 — — Trade payables — — 114,613 293,256 Saemangeum Sebit Power Plant Co., Ltd. Non-trade receivables and others — 653 — — Korea Gas Corporation (*1) Trade receivables 10,015 12,415 — — Non-trade 187 54,232 — — Trade payables — — 800,509 1,882,607 Non-trade — — 759 1,294 Daejung Offshore Wind Power Co., Ltd. Non-trade 77 123 — — Daegu Photovoltaic Co., Ltd. Trade payables — — 115 135 Non-trade payables and others — — — 2 Korea Electric Power Industrial Development Co., Ltd. Trade receivables 269 164 — — Non-trade 15 2 — — Trade payables — — 873 150 Non-trade — — 5,880 9,588 Goseong Green Power Co., Ltd. Trade receivables 495 76,254 — — Non-trade 76,855 14 — — Trade payables — — 218,627 182,095 Non-trade — — 59,987 52,515 Gangneung Eco Power Co., Ltd. Trade receivables 826 19,364 — — Non-trade 465 478 — — Non-trade — — 97 94 Shin Pyeongtaek Power Co., Ltd. Trade receivables 1,788 7,375 — — Non-trade 3,116 1,068 — — Trade payables — — 79,828 109,274 Non-trade — — 99 101 Noeul Green Energy Co., Ltd. Trade receivables 3 3 — — Non-trade 1,169 9,365 — — Non-trade payables and others — — — 2,468 Samcheok Eco Materials Co., Ltd. Trade receivables 52 46 — — YTN Co., Ltd. Trade receivables 99 112 — — Busan Green Energy Co., Ltd. Trade receivables 1 1 — — Non-trade 20,658 26,681 — — Non-trade payables and others — — — 4,415 Gunsan Bio Energy Co., Ltd. Non-trade 11,728 11,728 — — Korea Electric Vehicle Charging Service (*4) Trade receivables 193 — — — Non-trade 120 — — — Yaksu ESS Co., Ltd. Trade payables — — 1,374 — Gangwon Wind Power Co., Ltd. Trade receivables 8 6 — — Trade payables — — 4,293 5,197 Gwangyang Green Energy Co., Ltd. Non-trade 532 1,436 — — Bigeum Resident Photovoltaic Power Co., Ltd. Trade receivables 922 343 — — Non-trade receivables and others — 516 — — Goesan Solar park Co., Ltd. Trade payables — — 73 346 Hyundai Green Power Co., Ltd. Trade receivables 229 839 — — Korea Power Exchange Trade receivables 627 223 — — Non-trade 1,300 — — — Non-trade — — 2,189 2,405 Taebaek Wind Power Co., Ltd. Trade payables — — 560 680 Non-trade — — 262 178 Taebaek Guinemi Wind Power Co., Ltd. Trade payables — — 670 885 Pyeongchang Wind Power Co., Ltd. Trade receivables 4 3 — — Non-trade — — — 211 Daeryun Power Co., Ltd. Trade receivables 213 195 — — Trade payables — — 21,362 55,725 Changjuk Wind Power Co., Ltd. (*3) Trade payables — — 724 — Non-trade — — 295 — Receivables Payables Company name Type 2021 2022 2021 2022 In millions of won <Associates> GS Donghae Electric Power Co., Ltd. (*2) Trade receivables ￦ 383 872 — — Non-trade receivables and others 272 1,558 — — Trade payables — — 113,529 72,947 Non-trade payables and others — — 17 14,565 KNH Solar Co., Ltd. Trade receivables 1 1 — — S-Power Trade receivables 82 77 — — Non-trade 48 44 — — Trade payables — — 91,277 135,504 Non-trade payables and others — — — 11 PND solar Co., Ltd. Trade payables — — — 210 Hyundai Eco Energy Co., Ltd. Trade receivables 19 22 — — Trade payables — — 732 738 YeongGwang Yaksu Wind Electric Co., Ltd. Trade receivables 6 7 — — Trade payables — — — 589 Non-trade payables and others — — — 2,050 Taebaek Gadeoksan Wind Power Co., Ltd. Non-trade receivables and others 119 97 — — Trade payables — — 8,397 12,739 Non-trade payables and others — — 1,571 5 Korea Energy Solutions Co., Ltd. Non-trade payables and others — — — 94 Namjeongsusang Solar Power Operation Co., Ltd. Trade receivables — 2 — — Bitgoel Eco Energy Co., Ltd. Non-trade receivables and others 27 6 — — Non-trade payables and others — — — 1,023 Jeju Gimnyeong Wind Power Co., Ltd . Non-trade receivables and others — 130 — — Trade payables — — 885 1,758 Muan Solar park Co., Ltd. Trade receivables — 25 — — Non-trade receivables and others 23 9 — — Anjwa Smart Farm & Solar City Co., Ltd. Non-trade payables and others — — — 921 Daewon Green Energy Co., Ltd. Trade receivables — 1 — — Non-trade receivables and others 94 — — — Trade payables — — — 5,485 Saemangeum Heemang Photovoltaic Co., Ltd. Non-trade — 3,435 — — Non-trade — — — 1 Dongbu Highway Solar Co., Ltd. Trade receivables 1 1 — — Trade payables — — 98 2 Non-trade — — 90 2 Seobu Highway Solar Co., Ltd. Trade receivables — 1 — — Trade payables — — 177 8 Non-trade payables and others — — 105 3 Gwangbaek Solar Power Investment Co., Ltd. Non-trade payables and others — — — 61 Suwon New Power Co., Ltd. Non-trade receivables and others 1,198 1,280 — — Tronix Co., Ltd. Non-trade — 1 — — KOSTURE Co., Ltd. Trade receivables 1 6 — — Muan Sunshine Solar Power Plant Co., Ltd. Trade payables — — 1,748 3,076 Non-trade — — — 1,265 PlatformN. Co., Ltd. Non-trade payables and others — — — 232 8 Associates (Overseas) Trade receivables — 93 — — Non-trade receivables and others 3,196 49,409 — — Non-trade payables and others — — 502 502 <Joint ventures> Naepo Green Energy Co., Ltd. Trade receivables 42 169 — — Non-trade — — — 3 Dayone Energy Co., Ltd. Trade receivables 52 79 — — Non-trade 13,297 10,218 — — Trade payables — — 1,009 1,027 Non-trade — — 11,306 9,119 Daegu Green Power Co., Ltd. Trade receivables 71 53 — — Non-trade 55 56 — — Trade payables — — 35,766 66,715 Receivables Payables Company name Type 2021 2022 2021 2022 In millions of won <Joint ventures> KAPES, Inc. Trade receivables ￦ 2 2 — — Non-trade — — 2,121 106 Honam Wind Power Co., Ltd. Trade payables — — 575 515 Korea Power Engineering Service Co., Ltd. Non-trade receivables and others 48 47 — — Non-trade — — — 77 Seokmun Energy Co., Ltd. Trade receivables 34 67 — — Non-trade 149 113 — — Trade payables — — 7,941 7,000 Chun-cheon Energy Co., Ltd. Trade receivables 126 124 — — Non-trade 167 165 — — Trade payables — — 41,410 79,117 Yeonggwangbaeksu Wind Power Co., Ltd. Trade receivables 6 8 — — Non-trade receivables and others 53 166 — — Trade payables — — 1,099 1,076 Cheongna Energy Co., Ltd. Trade receivables 4,164 17,324 — — Non-trade receivables and others 1,350 1,654 — — Non-trade — — 1 1 Yeonggwang Wind Power Co., Ltd. Trade receivables 10 12 — — Non-trade 59 62 — — Trade payables — — 730 2,251 Western Power Changgi Solar Co., Ltd. (formerly, Sam-Yang Photovoltaic Power Co., Ltd.) (*3) Trade receivables 5 — — — KW Nuclear Components Co., Ltd. Trade receivables — 4 — — Non-trade — 18 — — KEPCO-Uhde Inc. Non-trade — — 10 10 Busan Shinho Solar Power Co., Ltd. Trade receivables 2 3 — — Trade payables — — 281 304 Global Trade Of Power System Co., Ltd. Non-trade payables and others — — 7 — Expressway Solar-light Power Generation Co., Ltd. Trade payables — — 102 166 Gunsan Land Solar Co., Ltd. Non-trade receivables and others — 138 — — Daesan Green Energy Co., Ltd. Trade receivables 11 18 — — Non-trade 120 218 — — Trade payables — — 5,120 4,946 Cheong-Song Noraesan Wind Power Co., Ltd. Trade receivables 2 2 — — Saemangeum Solar Power Co., Ltd. Non-trade 4,268 4,368 — — Dangjin Eco Power Co., Ltd. Trade receivables 3 3 — — Trade payables — — 276 222 Non-trade payables and others — — — 105 Hapcheon Floating Photovoltaic Power Plant Inc. Trade receivables — 9 — — Busan Industrial Solar Power Co., Ltd. Trade receivables 1 2 — — Trade payables — — 54 — Non-trade receivables and others — — 24 — Bitsolar Energy Co., Ltd. Non-trade receivables and others 7 222 — — Trade payables — — — 201 Non-trade payables and others — — 54 — Haemodum Solar Co., Ltd. Trade receivables 1 1 — — Yeongam Solar Power Co., Ltd. Trade receivables 29 44 — — Trade payables — — 3,324 3,655 Samsu Wind Power Co., Ltd. Trade payables — — 1,300 1,303 Solaseado Solar Power Co., Ltd. Non-trade receivables and others — 23 — — Non-trade payables and others — — — 2,911 Cheongju Eco Park Co., Ltd. Trade payables — — — 7,994 Enel X Midland Photovoltaic, LLC Trade receivables — 1 — — Trade payables — — — 3 Geumsungsan Wind Power Co., Ltd. Trade receivables — 3 — — Non-trade payables and others — — — 1 22 Joint ventures (Overseas) Trade receivables 84,150 73,805 — — Non-trade receivables and others 26,060 71,661 — — Non-trade payables and others — — 22,050 117,754 Receivables Payables Company name Type 2021 2022 2021 2022 In millions of won <Others> Korea Development Bank Accrued interest income ￦ 154 5 — — Non-trade receivables and others 420,732 30,836 — — Non-trade payables and others — — 21,172 101 Derivatives 59,139 67,662 — 3,759 (*1) The balance due to the fuel swap with Korea Midland Power Co., Ltd. is included. The total transaction amount is ￦514,405 million on loans and ￦460,903 million on bororrowings. (*2) The balance due to the fuel swap with Korea Western Power Co., Ltd. and Korea East-West Power Co., Ltd. is included. The total transaction amount is ￦5,590 million on loans and ￦20,113 million on bororrowings. (*3) Reclassified from a joint venture to a subsidiary during the year ended December 31, 2022. Transactions are made before the reclassification. (*4) The Company has disposed of shares of Korea Electric Vehicle Charging Service during the year ended December 31, 2022, and it is not a related party to the Group as of December 31, 2022. (5) Loans and others arising from related party transactions as of December 31, 2021 and 2022 are as follows: Type Company name Beginning Loans Collection Others Ending balance In millions of won Associates KNOC Nigerian East Oil Co., Ltd., KNOC Nigerian West Oil Co., Ltd. ￦ 29,481 104 — 1,888 31,473 (Allowance for doubtful accounts) (8,241 ) — — (2,510 ) (10,751 ) Associates Nepal Water & Energy Development Company Private Limited — 19,914 — — 19,914 Associates Xe-Pian Xe-Namnoy 21,456 — — 1,480 22,936 Associates PT Wampu Electric Power 13,000 — (5,233 ) 1,404 9,171 Associates PT Cirebon Energi Prasarana — 28,100 — 1,469 29,569 Associates Gunsan Bio Energy Co., Ltd. 12,396 — — — 12,396 (Allowance for doubtful accounts) (12,396 ) — — — (12,396 ) Associates Bigeum Resident Photovoltaic Power Co., Ltd. 11,212 — — — 11,212 Associates Daejung Offshore Wind Power Co., Ltd. 1,000 — — — 1,000 Associates Bitgoel Eco Energy Co., Ltd. 19,349 16,151 (710 ) — 34,790 Associates Saemangeum Sebit Power Plant Co., Ltd — 37,249 — — 37,249 Joint ventures Solaseado Solar Power Co., Ltd. 35,000 — — — 35,000 Joint ventures Recursos Solares PV de Mexico II, S.A. de C.V. 6,134 1,899 — 424 8,457 Joint ventures Horus Solar, S.A. de C.V. 16,514 1,695 — 1,078 19,287 Joint ventures Sunmex Renovables, S.A. de C.V. 13,571 1,913 — 899 16,383 Joint ventures Kelar S.A. 43,167 — — 798 43,965 Joint ventures DE Energia SpA 6,791 — — 469 7,260 Joint ventures Daehan Wind Power PSC 13,674 — — 944 14,618 Joint ventures PT. Tanjung Power Indonesia 1,090 — (1,114 ) 24 — Joint ventures Bitsolar Energy Co., Ltd. 3,165 — — — 3,165 Joint ventures Daesan Green Energy Co., Ltd. — 3,514 — — 3,514 Joint ventures Nghi Son 2 Power LLC — 185,306 — 1,429 186,735 Joint ventures Pulau Indah Power Plant Sdn. Bhd. — 10,475 — (268 ) 10,207 Joint ventures Guadalupe Solar SpA 3,360 — (253 ) 237 3,344 Joint ventures Foresight Iberian Solar Group Holding, S.L. 59,333 — — 1,969 61,302 Joint ventures Capman Lynx SCA, SICAR 29,770 — — 1,858 31,628 (Allowance for doubtful accounts) — (4,467 ) — — (4,467 ) Joint ventures S-Power Chile SpA — 253 — — 253 ￦ 318,826 302,106 (7,310 ) 13,592 627,214 (6) Borrowings arising from related party transactions as of December 31, 2021 and 2022 are as follows: Related parties Type Beginning balance Borrowings Repayment Others Ending balance In millions of won Korea Development Bank Facility ￦ 98,020 61,092 (64,875 ) 2,347 96,584 Others 2,509 — (376 ) — 2,133 Operating funds 184,300 164,252 (285,961 ) (158 ) 62,433 Syndicated Loans 14,530 — (1,040 ) (1,035 ) 12,455 EBL and others 53,965 76,878 (85,010 ) 3,059 48,892 ￦ 353,324 302,222 (437,262 ) 4,213 222,497 (7) Guarantees provided to related parties as of December 31, 2022 are as follows: Primary guarantor Principal obligor Type of guarantees Credit limit Creditor In millions of won Korea Electric Power Corporation Shuweihat Asia Operation & Maintenance Company Performance guarantees USD 11,000 Shuweihat Asia Power Investment B.V. Korea Electric Power Corporation Rabigh Operation & Maintenance Company Limited Performance guarantees and others USD 1,387 Rabigh Electricity Company Korea Electric Power Corporation Nghi Son 2 Power LLC Performance guarantees USD 70,000 SMBC Ho Chi Minh and others Korea Electric Power Corporation Barakah One Company Debt guarantees USD 1,223,355 Export-Import Bank of Korea and others Performance guarantees and others USD 4,197,287 Korea Electric Power Corporation RE Holiday Holdings LLC Performance guarantees(*9) USD 222,077 EFS Renewables Holdings, LLC, CA-CIB and others Korea Electric Power Corporation RE Pioneer Holdings LLC Performance guarantees USD 106,873 EFS Renewables Holdings, LLC Korea Electric Power Corporation RE Barren Ridge 1 Holdings LLC Performance guarantees(*9) USD 68,838 Firstar Development, LLC Korea Electric Power Corporation Rabigh Electricity Company Performance guarantees SAR 1,509 Hana Bank Korea Electric Power Corporation Shuweihat Asia Power Investment B.V. Performance guarantees USD 100,000 ING Bank Korea Electric Power Corporation Amman Asia Electric Power Company Performance guarantees USD 16,800 Shinhan Bank Korea Electric Power Corporation Horus Solar, S.A. de C.V. Other performance guarantees MXN 16,413 CENACE and others Korea Electric Power Corporation Recursos Solares PV de Mexico II, S.A. de C.V. Other performance guarantees MXN 1,518 SEMARNAT USD 393 CFE Transmission Korea Electric Power Corporation Sunmex Renovables, S.A. de C.V. Other performance guarantees USD 9,078 CENACE MXN 3,666 SEMARNAT Korea Electric Power Corporation International Offshore Power Transmission Holding Company Limited Performance guarantees USD 150,000 Mizuho Bank Other performance guarantees USD 7,000 Credit Agricole Korea Electric Power Corporation Pulau Indah Power Plant Sdn. Bhd.(*11) Collateralized money invested KRW 13,210 Malaysian Trustee Berhad Korea Western Power Co., Ltd. Cheongna Energy Co., Ltd. Collateralized money invested KRW 10,758 Kookmin Bank and others Guarantees for supplemental funding(*1) — Korea Western Power Co., Ltd. Xe-Pian Xe-Namnoy Power Co., Ltd. Collateralized money invested KRW 115,584 Krung Thai Bank Impounding bonus guarantees USD 5,000 SK E&C Korea Western Power Co., Ltd. Rabigh Operation & Maintenance Company Limited Performance guarantees and others SAR 11,200 National Bank of Kuwait Korea Western Power Co., Ltd. Daegu Photovoltaic Co., Ltd. Collateralized money invested KRW 2,849 Korea Development Bank Korea Western Power Co., Ltd. Dongducheon Dream Power Co., Ltd. Collateralized money invested(*5) KRW 52,476 Kookmin Bank and others Debt guarantees KRW 20,300 BNK Securities Korea Western Power Co., Ltd. PT. Mutiara Jawa Collateralized money invested KRW 3,597 Woori Bank Korea Western Power Co., Ltd. Haeng Bok Do Si Photovoltaic Power Co., Ltd. Collateralized money invested KRW 278 Nonghyup Bank Korea Western Power Co., Ltd. Shin Pyeongtaek Power Co., Ltd. Collateralized money invested KRW 133,823 Kookmin Bank and others Guarantees for supplemental funding(*1) — Korea Western Power Co., Ltd. Haemodum Solar Co., Ltd. Collateralized money invested KRW 3,367 Nonghyup Bank Korea Western Power Co., Ltd. Muan Solar Park Co., Ltd. Collateralized money invested KRW 7,838 IBK and others Korea Western Power Co., Ltd. Anjwa Smart Farm & Solar City Co., Ltd. Collateralized money invested KRW 8,662 Hana Bank and others Korea Western Power Co., Ltd. Seoroseoro Sunny Power Plant Co., Ltd. Collateralized money invested KRW 859 Hana Bank and others Korea Western Power Co., Ltd. YuDang Solar Co., Ltd. Collateralized money invested KRW 586 Hana Bank and others Guarantees for supplemental funding(*1) — Korea Western Power Co., Lt

Statement of Cash Flows

Statement of Cash Flows	12 Months Ended
	Dec. 31, 2022
Non Cash Transactions [Abstract]
Statement of Cash Flows	48. Statement of Cash Flows (1) Significant non-cash Transactions 2020 2021 2022 In millions of won Transfer from construction-in-progress ￦ 10,189,527 12,902,589 13,723,972 Recognition of asset retirement cost and related provision for decommissioning costs 895,507 2,356,805 3,497,866 Transfer from provision for disposal of spent nuclear fuel to accrued expenses 395,921 455,401 417,687 Transfer from long-term borrowings and debt securities to current portion of long-term 9,237,883 11,109,271 13,838,578 Transfer from inventory to stored nuclear fuel 1,055,974 908,842 738,720 Transfer of right-of-use 291,334 78,213 197,016 (2) Changes in liabilities incurred from financing activities for the years ended December 31, 2021, and 2022 are as follows: 2021 Non-cash Beginning Cash flows Increase Effect of fluctuations Ending In millions of won Borrowings and debt securities ￦ 69,724,581 9,653,394 — 1,151,538 80,529,513 Lease liabilities 4,621,096 (572,036 ) 73,090 288,353 4,410,503 ￦ 74,345,677 9,081,358 73,090 1,439,891 84,940,016 2022 Non-cash Beginning Cash flows Increase Effect of fluctuations Ending In millions of won Borrowings and debt securities ￦ 80,529,513 39,193,815 — 882,037 120,605,365 Lease liabilities 4,410,503 (562,647 ) 109,019 206,268 4,163,143 ￦ 84,940,016 38,631,168 109,019 1,088,305 124,768,508

Commitments for Expenditure

Commitments for Expenditure	12 Months Ended
	Dec. 31, 2022
Commitments for Expenditure [Abstract]
Commitments for Expenditure	49. Commitments for Expenditure (1) The commitments related to acquisition of property, plant and equipment as of December 31, 2021 and 2022 are as follows: 2021 2022 Contracts Commitment Remaining liability balances Commitment Remaining In millions of won Purchase of cable (PVC, 1C, 2000SQ) 153,000M and others (Shin-Bupyung-Youngseo) ￦ 57,046 16,240 57,203 12,595 Purchase of cable (PVC, 1C, 2500SQ) 103,374M and others (Bukdangjin-Shin-Tangjung) 46,616 34,102 50,151 37,638 Purchase of GIS (362kV, 6300A, 63kA) 23CB – Youngseo S/S 36,143 25,292 37,168 16,788 Purchase of GIS (362kV, 6300A, 63kA) 26CB – Hwasung S/S 40,010 5,540 — — Purchase of GIS (362kV, 6300A, 63kA) 27CB – Kwangyang S/S 37,744 140 37,744 140 Purchase of cable (PVC, 1C, 2500SQ) 100,548M and others 56,860 34,576 58,269 3,883 Purchase of GIS (362kV, 6300A, 63kA) 25CB – Migeum S/S 32,000 26,700 33,841 25,641 Advanced E-Type low-pressure electronic power meter 1,320,000 ea 65,972 23,262 — — Purchase of cable (PVC, 1C, 2000SQ) 5,862M and others (Baekun-Gwangyanghang) 34,423 23,297 35,949 3,232 Purchase of cable (TR CNCE-W,1C,325SQ) 1,016,000M 66,581 40,254 — — Purchase of cable (TR CNCE-W,1C,600SQ) 485,000M 46,194 37,810 — — Purchase of cable (TR CNCE-W/AL,1C,400SQ) 3,303,900M 87,382 83,628 — — Concrete pole (10M, general purpose, 350KGF) 126,948 ea and five other equipments 188,338 168,456 202,795 95,428 Purchase of GIS (362KV, 6300A, 63KA) 19 – Shinyangsan S/S 31,464 31,464 31,834 17,334 Purchase of cable (PVC, 1C, 2500SQ) 57,868M and others (Goduk-Seoansung) — — 40,937 3,748 Purchase of cable (PVC, 1C, 2000SQ) 87,732M and others (Eulwangboonki) — — 36,155 10,274 GIS(362KV,6300A,63KA) 18 – Wolsung S/Y — — 32,090 32,090 Purchase of cable (FR CNCO-W,1C,325SQ) 672,300M — — 31,387 19,213 Purchase of cable (TR CNCE-W,1C,325SQ) 1,342,000M — — 75,620 40,497 Purchase of cable (TR CNCE-W,1C,600SQ) 377,000M — — 31,851 17,478 Purchase of cable (TR CNCE-W/AL,1C,400SQ) 2,175,300M — — 53,064 29,436 System stabilization ESS equipment (Bubuk S/S) 1 Type — — 222,300 222,300 System stabilization ESS equipment (Shinnamwon S/S) Type 1 — — 211,500 211,500 System stabilization ESS equipment (Yeongcheon S/S) Type 1 — — 73,104 73,104 Construction of Saeul Units (#3,4) 9,800,424 3,479,667 9,800,424 2,455,673 Construction of Shin-Hanul Units (#1,2) 9,745,123 — 10,327,372 97,889 Other 36 contracts 792,485 620,593 853,941 425,149 Service of designing Seoul Combined Units (#1,2) 31,841 934 31,148 — Purchase of furnace for construction of Shin-Seocheon thermal power plant 305,209 7,722 305,209 5,132 Purchase of turbine generator for construction of Shin-Seocheon thermal power plant 105,226 6,301 107,333 6,214 Purchase of main machine for Jeju LNG combined 166,287 10,972 166,287 10,898 Purchase of equipments for the construction project of Boryeong indoor coal storage yard 317,350 317,350 318,197 287,965 Service of designing Taean Units (#9,10) 112,909 12,623 112,909 12,468 Purchase of gas turbine and turbine equipment of Gimpo combined heat & power plant 126,302 61,735 126,302 32,748 Purchase of steam turbine, HRSG and POWER BLOCK of Gimpo combined heat & power plant 214,053 138,244 221,997 38,714 Construction of Gimpo combined heat & power plant 130,015 86,323 181,798 56,558 Purchase of gas turbines, steam turbines, and accessories for Gumi natural gas power plant — — 197,983 197,983 Construction of Gumi natural gas power plant — — 204,094 204,094 Installation of natural gas supply facility at Gumi natural gas power plant — — 70,620 70,620 Purchase of coal handling machine for construction of Samcheok Units (#1,2) 286,571 6,215 299,048 6,687 2021 2022 Contracts Commitment Remaining liability balances Commitment Remaining In millions of won Purchase of main equipment for Namjeju 140,144 3 140,144 3 Purchase of main equipment for Shin-Sejong combined thermal power plant ￦ 234,392 200,122 234,392 32,472 Purchase of Hadong thermal power indoor carboniferous plant 148,800 129,042 162,814 105,504 Purchase of phase 1 power generation facility for Yeongwol fuel cells 88,449 1,523 — — Purchase of phase 2 power generation facility for Yeongwol fuel cells — — 86,100 30,527 Purchase of fuel cell power generation facilities for the fifth stage of Shinincheon headquarters — — 81,960 81,960 (2) As of December 31, 2022, details of contracts for inventory purchase commitment are as follows: The Company imports all of its uranium ore concentrates from sources outside Korea (including the United States, United Kingdom, Kazakhstan, France, Russia, South Africa, Canada and Australia) which are paid for with currencies other than Won, primarily in U.S. dollars. In order to ensure stable supply, the Company entered into long-term and medium-term contracts with various suppliers, and supplements such supplies with purchases of fuels on spot markets. The long-term and medium-term contract periods vary among contractors and the stages of fuel manufacturing process. Contract prices for processing of uranium are generally based on market prices. Contract periods for ore concentrates, conversion, enrichment and design and fabrication are as follows: Type Periods Contracted Concentrate 2022 ~ 2033 26,310 Ton U3O8 Transformed 2022 ~ 2030 19,012 Ton U Enrichment 2022 ~ 2032 21,434 Ton SWU In addition, the contracted quantity of the molded uranium between Korea Hydro & Nuclear Power Co., Ltd. and KEPCO Nuclear Fuel Co., Ltd., which are subsidiaries of the Company, is 1,418 Ton U (contract periods : 2014 ~ 2023

Contingencies and Commitments

Contingencies and Commitments	12 Months Ended
	Dec. 31, 2022
Contingencies and Commitments [Abstract]
Contingencies and Commitments	50. Contingencies and Commitments (1) Ongoing litigations and claims related with contingent liabilities and contingent assets as of December 31, 2021 and 2022 are as follows: 2021 2022 Number Claim Number Claim In millions of won As the defendant 683 ￦ 689,415 653 ￦ 981,878 As the plaintiff 284 784,453 238 599,809 As of December 31, 2022, there are 5 ongoing litigations and 1 arbitration case between consolidated entities. As of December 31, 2022, in connection with Shin-Hanul Unit 3 & 4, the Company has received communications from a vendor for costs incurred for the preliminary work of the main equipment and associated compensation due to the discontinuation of the construction. The Company does not believe that it has a present obligation to this vendor, and that it is probable that the Company will prevail if a lawsuit is filed against the Company. In addition, the Company is unable to reliably estimate the potential economic outflow related to the obligation as of December 31, 2022. The Company is the defendant against a number of claims. The following is ongoing claim pertaining to the Company which can potentially be significant: 1) There are multiple ongoing claims against the Company related to ordinary wages, requesting payment of unpaid wages. The Company believes that the possibility of the outflow of economic benefits is probable on the ongoing and the expected lawsuits. Accordingly, the Company recognized ￦114,937 million as litigation provisions in relation to the lawsuit as of December 31, 2022. In addition to the abovementioned significant ongoing claims, there are 5 arbitration cases pertaining to the Company as of December 31, 2022 and the significant arbitration cases for the year ended December 31, 2022 are as follows: 1) In relation to the electric power IT modernization project in Kerala, India, Enzen, a subcontractor, filed an arbitration against the Company to the Indian Council of Arbitration due to disagreements in the contract, but the Company has not recognized any provision because the amount and timing of economic benefit outflow cannot be reasonably estimated. (2) Guarantees of payments and commitments provided to other companies as of December 31, 2022 are as follows: 1) The Company has outstanding borrowings with a limit of USD 275,600 thousand from its creditors including 2) The Company has provided the Export-Import Bank of Korea, BNP Paribas and ING Bank with the guarantees of mutual investment of USD 5,947 thousand, which is equivalent to the ownership interest of PT BS Energy and PT Nusantara Hydro Alam, in order to guarantee the expenses related to hydroelectric power business of Tanggamus, Indonesia. 3) The Company has provided USD 18,500 thousand of business performance guarantees to AEP Texas, Inc., for the construction, ownership, operation, and related cost-bearing implementation of electric power transmission equipment regarding Concho Valley solar business in the United States. 4) The Company has provided the syndicate of lenders of PT Indo Raya Tenaga, the business corporation of PT Barito Wahana Tenaga, a guarantee by establishing the right of pledge on the shares of PT Barito Wahana Tenaga for project financing of PT Barito Wahana Tenaga as of December 31, 2022. 5) The Company has provided Axia Power Holdings B.V. and others a performance guarantee up to USD 54,000 thousand for the implementation of Cirebon thermal power generation project in Indonesia. 6) The Company has provided PT Perusahaan Listrik Negara a performance guarantee up to IDR 35,588,165 thousand for the implementation of Tanjung Jati power plant operation project in Indonesia. 7) The Company has provided the SMBC with the guarantees of mutual investment of USD 4,401 thousand, which is equivalent to the ownership interest of PT Mega Power Mandiri, in order to guarantee the expenses related to hydroelectric power business of Wampu, Indonesia. 8) The Company has provided USD 50,000 thousand for a performance guarantee to Morgan Stanley Capital Group Inc., to guarantee the electricity purchase contract in relation to photovoltaic power generation project in USA. 9) The Company has provided RBC Community Investments Impact Renewables HoldCo-1, LLC. a performance guarantee regarding weatherization in relation with tax investors up to USD 3,000 thousand for the of the power plant construction for Concho Valley solar power project in the United States. 10) The Company has provided USD 54,000 thousand for a performance guarantee to PT. Cirebon Electro Power, to guarantee the Cirebon coal-fired power plant operation and maintenance project in Indonesia. 11) Nonghyup Bank is providing a payment guarantee of USD 47.85 million to Mizuho Bank, Ltd., a third party, for the guarantee of debt repayment reserves of PT Cirebon Electric Power’s Indonesia Cirebon power plant project. 12) The Company has provided Morgan Stanley Renewables Inc. a guarantee up to USD 70,000 thousand for the fulfillment of subscription obligation regarding photovoltaic power generation project in USA. 13) The Company has provided EUR 10,000 thousand for a performance guarantee to Skandinaviska Enskilda Banken AB (publ) Frankfurt Branch through Kookmin Bank, to guarantee the opening of VAT payment loan account for Guba Buget wind power project in Sweden. 14) The Company has provided EUR 5,022 thousand for a performance guarantee to Microsoft through Kookmin Bank, to guarantee the implementation of the power plant construction for Guba Buget wind power project in Sweden. 15) The Company has provided EUR 9,980 thousand of a performance guarantee to Ellevio through Shinhan Bank, to guarantee the performance of the electric power transmission equipment connection construction for Guba Buget wind power project in Sweden. 16) The Company has provided Shinhan Bank a debt guarantee up to USD 60,000 thousand (current amount : USD 60,000 thousand) to guarantee Equity Bridge Loan for Concho Valley solar business in the United States. 17) The Company has provided Van Phong Power Company Ltd. a performance guarantee up to USD 5,000 thousand for the operation maintenance project in Van Phong, Vietnam. (3) Lines of credit provided by financial institutions as of December 31, 2022 are as follows: Commitments Financial institutions Currency Credit Used amount In millions of won and thousands of foreign currencies Commitments on Bank-overdraft Nonghyup Bank and others KRW 1,910,500 53,416 Limit amount available for CP Hana Bank and others KRW 3,250,000 3,250,000 General Loan, etc. Hana Bank and others KRW 3,000,000 3,000,000 Limit amount available for card Hana Bank and others Banco de Oro KRW PHP 47,424 5,000 2,615 3,000 Loan limit Korea Development Bank and others DBS Bank Ltd and others KRW USD 2,023,728 1,385,000 1,369,694 143,841 Certification of payment on payables from foreign country Nonghyup Bank USD 12,028 8,040 Certification of payment on L/C Credit Agricole and others USD 1,317,245 402,677 Kookmin Bank and others EUR 48,122 31,472 Shinhan Bank JPY 481,785 — Certification of Performance guarantee on contract s Hana Bank and others KRW 127,606 106,020 First Abu Dhabi Bank and others USD 1,092,590 788,404 Korea Development Bank and others JPY 620,000 620,000 Hana Bank and others EUR 3,965 3,965 Shinhan Bank INR 44,872 — Hana Bank SAR 1,509 1,509 Certification of bidding Hana Bank USD 5,200 — Export-Import Bank of Korea EUR 10,000 10,000 Advance payment bond, Warranty bond, Retention bond and others Export-Import Bank of Korea KRW 106,776 75,900 Hana Bank and others USD 306,251 282,224 Hana Bank and others MXN 21,597 20,027 Others Nonghyup Bank and others KRW 1,216,250 300,936 Export-Import Bank of Korea and others USD 733,318 510,094 Standard Chartered AED 50 50 Shinhan Bank SAR 3,000 3,000 Inclusive credit Hana Bank KRW 8,000 667 Kookmin Bank USD 135,000 45,909 Hana Bank INR — 323,837 Equity Bridge Loan Guarantee Mizuho Bank and others USD 1,685,955 1,141,788 Trade finance Export-Import Bank of Korea and others USD 970,000 — (4) As of December 31, 2022, blank check and assets provided as collaterals or pledges to financial institutions by the Company are follows: Obligor Creditor Assets provided as security Currency Amount Description In millions of won and thousands of foreign currencies Mira Power Limited International Finance Property, plant and equipment and others USD 275,600 Collateral for borrowings(*1) Tamra Offshore Wind Power Co., Ltd. Kyobo Life Insurance Co., Ltd. and others Property, plant and equipment and others KRW 171,600 Collateral for borrowings(*2) Gyeonggi Green Energy Co., Ltd. Korea Development Bank and others Cash and cash equivalents and others KRW 327,080 Collateral for borrowings(*2) Commerce and Industry Energy Co., Ltd. IBK and others Property, plant and equipment and others KRW 110,500 Collateral for borrowings(*2) KOSPO Youngnam Power Co., Ltd. Shinhan Bank and others Cash and cash equivalents and others KRW 744,120 Collateral for borrowings(*2) Gyeongju Wind Power Co., Ltd. Shinhan Bank and others Property, plant and equipment and others KRW 68,400 Collateral for borrowings(*2) Korea Offshore Wind Power Co., Ltd. Woori Bank and others Property, plant and equipment and others KRW 293,400 Collateral for borrowings(*2) Qatrana Electric Power Company The Islamic Development Bank and others Finance lease receivable and property, plant and equipment and others JOD 136,623 Collateral for borrowings(*1) KST Electric Power Company, S.A.P.I. de C.V. The Export—Import Bank of Korea and others Finance lease receivable and property, plant and equipment and others USD 401,277 Collateral for Incheon Fuel Cell Co., Ltd. Kookmin Bank and others Cash and cash equivalents and others KRW 276,960 Collateral for borrowings(*2) K-Solar Shinan Co., Ltd. (formerly, TS Energy No. 25 Co., Ltd.) Kyobo Life Insurance Co., Ltd. and others Property, plant and equipment and others KRW 329,736 Collateral for borrowings(*2) Jeongam Wind Power Co., Ltd. KDB Capital Corporation and others Cash and cash equivalents and others KRW 235,809 Collateral for borrowings(*2) (*1) This is based on the amount of loan commitment limit. (*2) As of December 31, 2022, the Company has established guarantees for pledge for transfer of rights of long-term borrowings, pledge for insurance claims, pledge for shares, etc. The Company has ￦1,197 million of project loans from the Korea Energy Agency as of December 31, 2022. The Company has provided a promissory note as a repayment guarantee. (5) (6) (7) (8) COVID-19, COVID-19. COVID-19 (9) (10) The ongoing armed conflict in Ukraine started in February 2022 and relevant sanctions against Russia imposed by the international community can impact not only sanctioned entities but also the entities doing business directly or indirectly with Ukraine or Russia and the entities exposed directly or indirectly to industries or economy of Russia or Ukraine. The Company cannot make reasonable estimation of the financial impact of the recent conflict in Ukraine on the future events. (11) The Organization for Economic Co-operation and Development (OECD)/G20 Inclusive Framework on Base Erosion and Profit Shifting (BEPS) addresses the tax challenges arising from the digitalization of the global economy. Global Minimum Tax (Pillar Two) were released and they apply to Multinational Enterprises (MNEs) with revenue in excess of EUR 750 million per their consolidated financial statements. National Assembly of South Korea passed the new Global Minimum Tax rules to align with the OECD BEPS Pillar Two in December 2022. The regulation will be included in the Adjustment of International Taxes Act and will be effective for fiscal years beginning on or after January 1, 2024. However, the Enforcement Decrees that provide further detail on the application of the legislation is only expected to be finalized later in 2023. In South Korea, Pillar Two legislation is not yet considered substantively enacted as of December 31, 2022 for IA

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2022
Disclosure of non-adjusting events after reporting period [abstract]
Subsequent Events	51. Subsequent Events (1) Subsequent to December 31, 2022, KEPCO and its subsidiaries including Korea Hydro & Nuclear Power Co., Ltd., Korea South-East Power Co., Ltd., Korea Western Power Co., Ltd., and Korea Southern Power Co., Ltd. issued corporate bonds for the purposes of operation and others as follows: Company Type Issue date Maturity Interest rate (%) Amount In millions of won and thousands of foreign currencies Korea Electric Power Corporation #1339 Corporate bond 2023.01.03 2025.01.03 4.40 ￦ 200,000 #1340 Corporate bond 2023.01.03 2026.01.03 4.50 320,000 #1341 Corporate bond 2023.01.05 2025.01.05 4.20 140,000 #1342 Corporate bond 2023.01.05 2026.01.05 4.30 240,000 #1343 Corporate bond 2023.01.09 2025.01.09 4.20 130,000 #1344 Corporate bond 2023.01.09 2026.01.09 4.28 280,000 #1345 Corporate bond 2023.01.12 2025.01.12 4.00 110,000 #1346 Corporate bond 2023.01.12 2026.01.12 4.08 330,000 #1347 Corporate bond 2023.01.16 2025.01.16 4.00 190,000 #1348 Corporate bond 2023.01.16 2026.01.16 4.05 220,000 #1349 Corporate bond 2023.01.19 2025.01.19 3.85 180,000 #1350 Corporate bond 2023.01.19 2026.01.19 3.87 320,000 #1351 Corporate bond 2023.01.25 2025.01.25 3.85 140,000 #1352 Corporate bond 2023.01.25 2026.01.25 3.89 410,000 #1353 Corporate bond 2023.02.03 2025.02.03 3.50 220,000 #1354 Corporate bond 2023.02.03 2026.02.03 3.54 280,000 #1355 Corporate bond 2023.02.06 2025.02.06 3.65 210,000 #1356 Corporate bond 2023.02.06 2026.02.06 3.65 320,000 #1357 Corporate bond 2023.02.10 2025.02.10 3.80 100,000 #1358 Corporate bond 2023.02.10 2026.02.10 3.83 340,000 #1359 Corporate bond 2023.02.13 2025.02.13 3.83 180,000 #1360 Corporate bond 2023.02.13 2026.02.13 3.85 320,000 #1361 Corporate bond 2023.02.17 2025.02.17 3.99 110,000 #1362 Corporate bond 2023.02.17 2026.02.17 4.10 320,000 #1363 Corporate bond 2023.02.20 2025.02.20 4.09 150,000 #1364 Corporate bond 2023.02.20 2026.02.20 4.11 160,000 #1365 Corporate bond 2023.03.03 2025.03.03 4.35 100,000 #1366 Corporate bond 2023.03.03 2026.03.03 4.40 110,000 #1367 Corporate bond 2023.03.06 2025.03.06 4.25 180,000 #1368 Corporate bond 2023.03.06 2026.03.06 4.35 210,000 #1369 Corporate bond 2023.03.10 2025.03.10 4.25 230,000 #1370 Corporate bond 2023.03.10 2026.03.10 4.35 230,000 #1371 Corporate bond 2023.03.13 2025.03.13 4.14 140,000 #1372 Corporate bond 2023.03.13 2026.03.13 4.25 260,000 #1373 Corporate bond 2023.03.22 2025.03.22 3.97 160,000 #1374 Corporate bond 2023.03.22 2026.03.22 4.00 70,000 #1375 Corporate bond 2023.03.30 2025.03.30 3.98 240,000 #1376 Corporate bond 2023.03.30 2026.03.30 3.99 160,000 #1377 Corporate bond 2023.04.04 2025.04.04 3.99 270,000 #1378 Corporate bond 2023.04.04 2026.04.04 4.00 260,000 #1379 Corporate bond 2023.04.07 2025.04.07 3.95 210,000 #1380 Corporate bond 2023.04.07 2026.04.07 3.95 190,000 #1381 Corporate bond 2023.04.12 2025.04.12 3.91 240,000 #1382 Corporate bond 2023.04.12 2026.04.12 3.95 170,000 #1383 Corporate bond 2023.04.21 2025.04.21 3.89 200,000 Company Type Issue date Maturity Interest rate (%) Amount In millions of won and thousands of foreign currencies Korea Hydro & Nuclear Power Co., Ltd. #70-1 Corporate bond 2023.02.22 2028.02.22 4.10 90,000 #70-2 Corporate bond 2023.02.22 2033.02.22 4.15 40,000 #70-3 Corporate bond 2023.02.22 2043.02.22 4.08 20,000 #71-1 Corporate bond 2023.03.07 2028.03.07 4.13 50,000 #71-2 Corporate bond 2023.03.07 2033.03.07 4.18 30,000 #72-1 Corporate bond 2023.04.26 2028.04.26 3.91 130,000 #72-2 Corporate bond 2023.04.26 2043.04.26 4.00 90,000 Korea South-East Power Co., Ltd. #57-1 Corporate bond 2023.02.09 2024.02.08 3.56 120,000 #57-2 Corporate bond 2023.02.09 2026.02.09 3.74 50,000 Korea Western Power Co., Ltd. #57-1 Corporate bond 2023.01.17 2025.01.17 4.07 70,000 #57-2 Corporate bond 2023.01.17 2026.01.17 4.04 30,000 #58-1 Corporate bond 2023.04.20 2026.04.20 3.98 200,000 #58-2 Corporate bond 2023.04.20 2028.04.20 4.13 40,000 #58-3 Corporate bond 2023.04.20 2043.04.20 3.94 20,000 Korea Southern Power Co., Ltd. #67-1 Corporate bond 2023.01.12 2024.01.12 3.97 100,000 #67-2 Corporate bond 2023.01.12 2025.01.10 4.04 40,000 #68-1 Corporate bond 2023.04.13 2024.04.12 3.63 150,000 #68-2 Corporate bond 2023.04.13 2026.04.13 3.76 50,000 (2) On February 14th, 2023, the subsidiary, Korea South-East Power Co., Ltd. invested in Bidiai Co., Ltd., and as a result of the approval of Bidiai’s restructuring plan, on February 17th, 2023, ￦ billion of bonds were converted into shares, making Korea South-East Power Co., Ltd. the largest shareholder of Bidiai Co., Ltd. with a stake of (3) On January 8th, 2023, a fire broke out in Taean IGCC Gas Refining Plant of the subsidiary, Korea Western Power Co., Ltd., resulting in the suspension of production. The amount of damages caused by the fire is under investigation, and the Company is currently verifying the insurance coverage with the property insurance policy.

Basis of Preparation (Policies)

Basis of Preparation (Policies)	12 Months Ended
	Dec. 31, 2022
Basis of Preparation [Abstract]
Statement of compliance	(1) Statement of compliance These consolidated financial statements have been prepared in accordance with International Financial Reporting Standards (“IFRS”) as issued by the International Accounting Standards Board (“IASB”).
Basis of measurement	(2) Basis of measurement These consolidated financial statements have been prepared on the historical cost basis, except for the following material items in the consolidated statements of financial position: • financial assets at fair value through profit or loss • financial assets at fair value through other comprehensive income • derivative financial instruments are measured at fair value • liabilities for defined benefit plans are recognized at the net of the total present value of defined benefit obligations less the fair value of plan assets
Functional and presentation currency	(3) Functional and presentation currency These consolidated financial statements are presented in Korean won (presented as “won” or “KRW”), which is also the functional currency of KEPCO and most of the significant operating subsidiaries.
Use of estimates and judgments	(4) Use of estimates and judgments The preparation of the consolidated financial statements in conformity with IFRS requires management to make judgments, estimates and assumptions that affect the application of accounting policies and the reported amounts of assets, liabilities, income and expenses. Actual results may differ from these estimates. Estimates and underlying assumptions are reviewed on an ongoing basis. Revisions to accounting estimates are recognized in the period in which the estimates are revised and in any future periods affected. The followings are the key assumptions and other key sources of estimation uncertainty at the end of the reporting period, that have a significant risk of causing a material adjustment to the carrying amounts of assets and liabilities within the next financial year. (i) Useful lives of property, plant and equipment, and estimations on provision for decommissioning costs The Company reviews the estimated useful lives of property, plant and equipment at the end of each annual reporting period. Management’s assumptions could affect the determination of estimated economic useful lives. The Company records the fair value of estimated decommissioning costs as a liability in the period in which the Company incurs a legal obligation associated with the retirement of long-lived assets that result from acquisition, construction, development and/or normal use of the assets. The Company is required to record a liability for the dismantling (demolition) of nuclear power plants and disposal of spent fuel and low and intermediate radioactive wastes. The measurement of such liability is subject to change based on change in estimated cash flow, inflation rate, discount rate, and expected timing of decommissioning. (ii) Deferred tax The Company recognizes deferred tax assets and liabilities based on the differences between the financial statement carrying amounts and the tax bases of assets and liabilities of each consolidated taxpaying entity. However, the amount of deferred tax assets may be different if the Company determines the estimated future taxable income is not sufficient to realize the deferred tax assets recognized. (iii) Valuations of financial instruments at fair values The Company’s accounting policies and disclosures require the measurement of fair values, for both financial and non-financial If third party information, such as broker quotes or pricing services, is used to measure fair values, then the valuation team assesses the evidence obtained from the third parties to support the conclusion that such valuations meet the requirements of IFRS including the level in the fair value hierarchy in which such valuation techniques should be classified. When measuring the fair value of an asset or a liability, the Company uses market observable data as far as possible. Fair values are categorized into different levels in a fair value hierarchy based on the inputs used in the valuation techniques as follows. If the inputs used to measure the fair value of an asset or a liability might be categorized in different levels of the fair value hierarchy, then the fair value measurement is categorized in its entirety in the same level of the fair value hierarchy as the lowest level input that is significant to the entire measurement. The Company recognizes transfers between levels of the fair value hierarchy at the end of the reporting period during which the change has occurred. (iv) Defined employee benefit liabilities The Company offers its employees defined benefit plans. The cost of providing benefits is determined using the Projected Unit Credit Method, with actuarial valuations being carried out at the end of each reporting period. For actuarial valuations, certain inputs such as discount rates and future salary increases are estimated. Defined benefit plans contain significant uncertainties in estimations due to its long-term nature (refer to Note 25). (v) Unbilled revenue Electricity delivered but neither metered nor billed is estimated at the reporting date based on the volume of electricity delivered which can vary significantly as a result of customer usage patterns, customer mix, meter reading schedules, weather, and etc. Unbilled revenue recognized as of December 31, 2021 and 2022 are ￦2,348,813 million and ￦1,725,444 million, respectively. (vi) Construction contracts The Company recognizes revenue over time using the cost-based input method which represents a faithful depiction of the Company’s progress towards complete satisfaction of providing the power plant construction, which has been identified as a single performance obligation. In applying the cost-based input method, it is necessary to use estimates and assumptions related to the Company’s efforts or inputs expected to be incurred. Costs incurred towards contract completion include costs associated with direct materials, labor, and other indirect costs related to contract performance. Judgment is required in estimating the costs expected to incur in completing the construction projects which involves estimating future materials, labor, contingencies and other related costs. Revenue is estimated based on the contractual amount; however, it can also be affected by uncertainties resulting from unexpected future events. (vii) The 30-year According to the 8th Basic Plan for Electricity Supply and Demand announced by the Ministry of Trade, Industry and Energy in 2017, Wolsong unit 1 nuclear power plant was expected to go through a comprehensive evaluation for the feasibility of continuous operation including economic efficiency and acceptability of household and community in 2018 in order to decide whether to shut down early. On June 15, 2018, the board of directors of Korea Hydro & Nuclear Power Co., Ltd. (“KHNP”), a subsidiary of KEPCO, has decided to shut down Wolsong unit 1 on the grounds that its deficit was increasing and its economic efficiency was low due to the nonoptimal utilization rate. On December 24, 2019, NSSC approved permanent shutdown of unit 1. In addition, the Company has also decided to discontinue the construction of Cheonji unit 1 and 2 and Daejin unit 1 and 2 pursuant to the government policy. Accordingly, the Company recognized impairment loss and other expenses during the year ended December 31, 2018. Among the new nuclear power plants under construction, Shin-Hanul unit 3 and 4, for which approval for power generation business was previously obtained, are not included in the list of construction suspension as determined by the board of directors of KHNP. However, it is highly likely that the construction of Shin-Hanul unit 3 and 4 will be suspended according to the government’s policy. Accordingly, the Company recognized impairment loss during the year ended December 31, 2018, as the Company believed that there was a significant change in its operating environment. However, in accordance with the “New Government Energy Policy Direction”, the management of KHNP, a subsidiary of the Company, reported to its board of directors on the resumption, licensing, and major contracts of suspension services related to Shin-Hanul Shin-Hanul Information about critical judgments in applying accounting policies that have the most significant effect on the amounts recognized in the consolidated financial statements is included in the following notes: ✓ Note 17 – Investments in Associates and Joint Ventures ✓ Note 18 – Property, Plant and Equipment ✓ Note 20 – Construction Contracts ✓ Note 45 – Risk Management Information about assumptions and estimation uncertainties that have a significant risk of resulting in a material adjustment within the next financial year is included in the following notes: ✓ Note 25 – Employment Benefits ✓ Note 41 – Income Taxes
Changes in accounting policies	(5) Changes in accounting policies (i) Property, Plant and Equipment: Proceeds before Intended Use – Amendments to IA The amendment prohibits entities from deducting from the cost of an item of property, plant and equipment any proceeds from selling items produced while bringing that asset to the location and condition necessary for it to be capable of operating in the manner intended by management. Instead, an entity recognizes the proceeds from selling such items, and the costs of producing those items, in profit or loss. The Company applied the amendment retrospectively to items of property, plant and equipment that are capable of operating on or after the beginning of the earliest period presented in the financial statements in which the entity first applies the amendments, and the impacts on the Company’s consolidated financial statements on the date of initial application (January 1, 2021) are as follows: ① The impacts on the Company’s consolidated statement of financial position as of December 31, 2021 are as follows: Original carrying amount Adjustment New carrying amount In millions of won Current assets ￦ 22,050,845 — 22,050,845 Non-current 189,058,025 14,857 189,072,882 Total Assets 211,108,870 14,857 211,123,727 Current liabilities 31,732,220 — 31,732,220 Non-current 114,064,801 — 114,064,801 Total Liabilities 145,797,021 — 145,797,021 Contributed capital 4,053,578 — 4,053,578 Retained earnings 45,246,982 11,262 45,258,244 Other components of equity 14,468,450 — 14,468,450 Non-controlling 1,542,839 3,595 1,546,434 Total Equity 65,311,849 14,857 65,326,706 Total Liabilities and Equity ￦ 211,108,870 14,857 211,123,727 ② The impacts on the Company’s consolidated statement of comprehensive income Original carrying amount Adjustment New carrying amount In millions of won except per share information Sales ￦ 60,574,819 98,768 60,673,587 Cost of sales (63,559,178 ) (85,112 ) (63,644,290 ) Gross loss (2,984,359 ) 13,656 (2,970,703 ) Selling and administrative expenses (2,875,784 ) (12 ) (2,875,796 ) Operating loss (5,860,143 ) 13,644 (5,846,499 ) Other non-operating 372,921 — 372,921 Other non-operating (257,932 ) — (257,932 ) Other gains, net 8,519 — 8,519 Finance income 1,402,614 — 1,402,614 Finance expenses (3,245,777 ) — (3,245,777 ) Profit related to associates, joint ventures and subsidiaries 494,584 — 494,584 Loss before income tax (7,085,214 ) 13,644 (7,071,570 ) Income tax benefit 1,855,989 — 1,855,989 Net Loss for the period (5,229,225 ) 13,644 (5,215,581 ) Loss attributable to owners of the controlling company (5,315,055 ) 10,533 (5,304,522 ) Profit attributable to non-controlling 85,830 3,111 88,941 Other comprehensive income (loss) 599,614 — 599,614 Total comprehensive income (loss) for the period (4,629,611 ) 13,644 (4,615,967 ) Total comprehensive loss attributable to owners of the controlling company (4,754,046 ) 10,533 (4,743,513 ) Total comprehensive income (attributable to non-controlling 124,435 3,111 127,546 Loss per share (in won) ￦ (8,279 ) 16 (8,263 ) ③ The impacts on the Company’s consolidated statement of cash flows for the year ended December 31, 2021 are as follows: Original carrying amount Adjustment New carrying amount In millions of won Cash flows from operating activities ￦ 4,473,186 18,192 4,491,378 Cash flows from investing activities (12,354,328 ) (18,192 ) (12,372,520 ) Cash flows from financing activities 8,435,077 — 8,435,077 ① The impacts on the Company’s consolidated statement of financial position as of January 1, 2021 are as follows: Original carrying Adjustment New carrying In millions of won Current assets ￦ 20,561,941 — 20,561,941 Non-current assets 182,580,170 1,214 182,581,384 Total Assets 203,142,111 1,214 203,143,325 Current liabilities 25,881,222 — 25,881,222 Non-current liabilities 106,594,043 — 106,594,043 Total Liabilities 132,475,265 — 132,475,265 Contributed capital 4,053,578 — 4,053,578 Retained earnings 51,133,601 730 51,134,331 Other components of equity 14,109,501 — 14,109,501 Non-controlling interests 1,370,166 484 1,370,650 Total Equity 70,666,846 1,214 70,668,060 Total Liabilities and Equity 203,142,111 1,214 203,143,325 ② The impacts on the Company’s consolidated statement of comprehensive income (loss) for the year ended December 31, 2020 are as follows: Original carrying Adjustment New carrying In millions of won except per share information Sales ￦ 57,925,837 797 57,926,634 Cost of sales (51,804,596 ) 417 (51,804,179 ) Gross loss 6,121,241 1,214 6,122,455 Selling and administrative expenses (2,678,443 — (2,678,443 ) Operating loss 3,442,798 1,214 3,444,012 Other non-operating income 1,036,448 — 1,036,448 Other non-operating expense (417,720 — (417,720 ) Other gains, net 35,094 — 35,094 Finance income 1,510,249 — 1,510,249 Finance expenses (2,896,443 — (2,896,443 ) Profit related to associates, joint ventures and subsidiaries 281,107 — 281,107 Loss before income tax 2,991,533 1,214 2,992,747 Income tax benefit (899,064 — (899,064 ) Net Loss for the period 2,092,469 1,214 2,093,683 Loss attributable to owners of the controlling company 1,991,347 730 1,992,077 Profit attributable to non-controlling interests 101,122 484 101,606 Other comprehensive income (loss) (219,841 — (219,841 ) Total comprehensive income (loss) for the period 1,872,628 1,214 1,873,842 Total comprehensive loss attributable to owners of the controlling company 1,802,824 730 1,803,554 Total comprehensive income (attributable to non-controlling interests 69,804 484 70,288 Loss per share (in won) ￦ 3,102 — 3,102 ③ The impacts on the Company’s consolidated statement of cash flows for the year ended December 31, 2020 are as follows: Original carrying amount Adjustment New carrying In millions of won Cash flows from operating activities ￦ 13,208,473 1 13,208,474 Cash flows from investing activities (14,831,811 (1 ) (14,831,812 ) Cash flows from financing activities 1,880,824 — 1,880,824 (ii) Other changes in accounting standards effective from January 1, 2022 are as follows. The Company believes that these amendments have no significant impact on the Company’s consolidated financial statements. The Company has not applied the new and revised standards in issue but not yet effective for the periods starting from January 1, 2022, even though the early adoption of these standards is possible. Onerous Contracts—Costs of Fulfilling a Contract—Amendments to IAS 37 Onerous contract is a contract in which the unavoidable costs of meeting the obligations under the contract exceed the economic benefits expected to be received under it. The amendment specifies that the costs of fulfilling a contract comprise incremental costs, such as the costs of materials or labor, and an allocation of other costs directly related to the contract, such as an allocation of the depreciation charge for an item of property, plant and equipment used in fulfilling the contract, when assessing whether a contract is an onerous contract. The Company will apply the amendment to the contracts for which all obligations have not been fulfilled at the date of initial application. Reference to the Conceptual Framework—Amendments to IFRS 3 The amendments are intended to replace a reference to the Framework for the Preparation and Presentation of Financial Statements, issued in 1989, with a reference to the Conceptual Framework for Financial Reporting issued in March 2018 without significantly changing its requirements. An exception has been added to the recognition principle in IFRS 3 to avoid ‘day 2’ gains or losses arising for liabilities and contingent liabilities that would be within the scope of IAS 37 or IFRIC 21 Levies. It requires an entity to apply criteria in IAS 37 and IFRIC 21 respectively to determine whether a present obligation exists at the acquisition date. The amendment added a new paragraph to IFRS 3 to clarify that the contingent assets should not be recognized at the date of acquisition. IFRS 1 First-time Adoption of International Financial Reporting Standards—Subsidiary as a first-time adopter The amendment permits a subsidiary that elects to apply paragraph D16(a) of IFRS 1 to measure cumulative translation differences using the amounts reported by the parent, based on the parent’s date of transition to IFRS. This amendment is also applied to an associate or joint venture that elects to apply paragraph D16(a) of IFRS 1. IFRS 9 Financial Instruments—Fees in the ‘10 per cent’ test for derecognition of financial liabilities The amendment clarifies the fees that an entity includes when assessing whether the terms of a new or modified financial liability are substantially different from the terms of the original financial liability. These fees include only those paid or received between the borrower and the lender, including fees paid or received by either the borrower or lender on the other’s behalf. There is no restricted and similar amendment to IAS 39. IAS 41 Agriculture—Taxation in fair value measurements The amendments remove the requirement in paragraph 22 of IAS 41 that entities exclude cash flows for taxation when measuring the fair value of assets within the scope of IAS 41.

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2022
Disclosure Of Significant Accounting Policies [Abstract]
Basis of consolidation	(1) Basis of consolidation The consolidated financial statements are the financial statements of the Company in which the assets, liabilities, equity, income, expenses and cash flows of KEPCO and its subsidiaries are presented as those of a single economic entity. Subsidiaries are those entities controlled by the Company. The Company controls an entity when it is exposed to, or has rights to, variable returns from its involvement with the entity and has the ability to affect those returns through its power over the entity. Income and expense of a subsidiary acquired or disposed of during the year are included in the consolidated statement of comprehensive income (loss) from the effective date of acquisition and up to the effective date of disposal, as appropriate. Total comprehensive income of subsidiaries is attributed to the owners of the Company and to the non-controlling non-controlling When necessary, adjustments are made to the financial statements of subsidiaries to bring their accounting policies in line with those of the Company. All intra-company assets and liabilities, equity, income, expenses and cash flows relating to transactions between entities within the Company are eliminated in full on consolidation. Changes in the Company’s ownership interests in a subsidiary that do not result in the Company losing control over the subsidiary are accounted for as equity transactions. The carrying amounts of the Company’s interests and the non-controlling non-controlling When the Company loses control of a subsidiary, the income or loss on disposal is calculated as the difference between (i) the aggregate of the fair value of the consideration received and the fair value of any retained interest and (ii) the previous carrying amount of the assets (including goodwill), and liabilities of the subsidiary and any non-controlling
Business combinations	(2) Business combinations A business combination is accounted for by applying the acquisition method, unless it is a combination involving entities or businesses under common control. The consideration transferred in a business combination is measured at fair value, which is calculated as the sum of the acquisition-date fair values of the assets transferred by the Company, liabilities incurred by the Company to the former owners of the acquiree and the equity interests issued by the Company in exchange for control of the acquiree. Acquisition-related costs are generally recognized in profit or loss as incurred. At the acquisition date, the identifiable assets acquired and the liabilities assumed are recognized at their fair value at the acquisition date, except that: • deferred tax assets or liabilities and liabilities or assets related to employee benefit arrangements are recognized and measured in accordance with IAS 12 ‘Income Taxes’ and IAS 19 ‘Employee Benefits’ respectively; • assets (or disposal groups) that are classified as held for sale in accordance with IFRS 5 ‘Non-current Goodwill is measured as the excess of the sum of the consideration transferred, the amount of any non-controlling non-controlling Non-controlling non-controlling transaction-by-transaction non-controlling When the consideration transferred by the Company in a business combination includes assets or liabilities resulting from a contingent consideration arrangement, the contingent consideration is measured at its acquisition-date fair value and included as part of the consideration transferred in a business combination. Changes in the fair value of the contingent consideration that qualify as measurement period adjustments are adjusted retrospectively, with corresponding adjustments against goodwill. Measurement period adjustments are adjustments that arise from additional information obtained during the ‘measurement period’ (which cannot exceed one year from the acquisition date) about facts and circumstances that existed at the acquisition date. The subsequent accounting for changes in the fair value of the contingent consideration that do not qualify as measurement period adjustments depends on how the contingent consideration is classified. Contingent consideration that is classified as equity is not re-measured re-measured When a business combination is achieved in stages, the Company’s previously held equity interest in the acquiree is re-measured If the initial accounting for a business combination is incomplete by the end of the reporting period in which the combination occurs, the Company reports provisional amounts for the items for which the accounting is incomplete. Those provisional amounts are adjusted during the measurement period (see above), or additional assets or liabilities are recognized, to reflect new information obtained about facts and circumstances that existed at the acquisition date that, if known, would have affected the amounts recognized at that date. The assets and liabilities acquired under business combinations under common control are recognized at the carrying amounts recognized previously in the consolidated financial statements of the ultimate parent. The difference between consideration transferred and carrying amounts of net assets acquired is recognized as part of share premium.
Investments in associates	(3) Investments in associates An associate is an entity over which the Company has significant influence and that is neither a subsidiary nor an interest in a joint venture. Significant influence is the power to participate in the financial and operating policy decisions of the investee but does not control or joint control over those policies. If the Company holds 20% ~ 50% of the voting power of the investee, it is presumed that the Company has significant influence over the investee. The results and assets and liabilities of associates are incorporated in these consolidated financial statements using the equity method of accounting. If the investment is classified as held for sale, in which case it is accounted for in accordance with IFRS 5 ‘Non-current takes place, the Company shall account for any retained interest in associates in accordance with IFRS 9 ‘Financial Instruments’ unless the retained interest continues to be an associate, in which case the entity uses the equity method. Under the equity method, an investment in an associate is initially recognized in the consolidated statement of financial position at cost and adjusted thereafter to recognize the Company’s share of the profit or loss and other comprehensive income of the associate. When the Company’s share of losses of an associate exceeds the Company’s interest in that associate (which includes any long-term interests that, in substance, form part of the Company’s net investment in the associate), the Company discontinues recognizing its share of further losses. Additional losses are recognized only to the extent that the Company has incurred legal or constructive obligations or made payments on behalf of the associate. Any excess of the cost of acquisition over the Company’s share of the net fair value of the identifiable assets, liabilities and contingent liabilities of an associate recognized at the date of acquisition is recognized as goodwill, which is included within the carrying amount of the investment. Any excess of the Company’s share of the net fair value of the identifiable assets, liabilities and contingent liabilities over the cost of acquisition, after reassessment, is recognized immediately in profit or loss. Upon disposal of an associate that results in the Company losing significant influence over that associate, any retained investment is measured at fair value at that date and the fair value is regarded as its fair value on initial recognition as a financial asset in accordance with IFRS 9. The difference between the previous carrying amount of the associate attributable to the retained interest and its fair value is included in the determination of the gain or loss on disposal of the associate. In addition, the Company accounts for all amounts previously recognized in other comprehensive income in relation to that associate on the same basis as would be required if that associate had directly disposed of the related assets or liabilities. Therefore, if a gain or loss previously recognized in other comprehensive income by that associate would be reclassified to profit or loss on the disposal of the related assets or liabilities, the Company reclassifies the gain or loss from equity to profit or loss (as a reclassification adjustment) when it loses significant influence over that associate. The requirements of IAS 28’ Investments in Associates and Joint Ventures’ are applied to determine whether it is necessary to recognize any impairment loss with respect to the Company’s investment in an associate. When necessary, the entire carrying amount of the investment (including goodwill) is tested for impairment in accordance with IAS 36 ‘Impairment of Assets’ as a single asset by comparing its recoverable amount (higher of value in use and fair value less costs to sell) with its carrying amount, any impairment loss recognized forms part of the carrying amount of the investment. Any reversal of that impairment loss is recognized in accordance with IAS 36 to the extent that the recoverable amount of the investment subsequently increases. When the Company transacts with its associate, incomes and losses resulting from the transactions with the associate are recognized in the Company’s consolidated financial statements only to the extent of interests in the associate that are not related to the Company.
Joint arrangements	(4) Joint arrangements A joint arrangement is an arrangement of which two or more parties have joint control. Joint control is the contractually agreed sharing of control of an arrangement, which exists only when decisions about the relevant activities require the unanimous consent of the parties sharing control. Joint arrangements are classified into two types - joint operations and joint ventures. A joint operation is a joint arrangement whereby the parties that have joint control of the arrangement (i.e., joint operators) have rights to the assets, and obligations for the liabilities, relating to the arrangement. A joint venture is a joint arrangement whereby the parties that have joint control of the arrangement (i.e., joint ventures) have rights to the net assets of the arrangement. The classification of a joint arrangement as a joint operation or a joint venture depends upon the rights and obligations of the parties to the arrangement. The Company determines the type of joint arrangement in which it is involved by considering the structure and form of the arrangement, the terms agreed by the parties in the contractual arrangement and other facts and circumstances. If the joint arrangement is a joint operation, the Company is to recognize and measure the assets and liabilities (and recognize the related revenues and expenses) in relation to its interest in the arrangement in accordance with relevant IFRSs applicable to the particular assets, liabilities, revenues and expenses. If the joint arrangement is a joint venture, the Company is to account for that investment using the equity method accounting in accordance with IAS 28 ‘Investment in Associates and Joint Ventures’ (refer to Note 3.(3)), except when the Company is applicable to the IFRS 5 ‘Non-current for Sale’.
Non-current assets held for sale	(5) Non-current Non-current non-current When the Company is committed to a sale plan involving loss of control of a subsidiary, all of the assets and liabilities of that subsidiary are classified as held for sale when the criteria described above are met, regardless of whether the Company will retain a non-controlling Non-current
Goodwill	(6) Goodwill The Company measures goodwill which acquired in a business combination at the amount recognized at the date on which it obtains control of the acquiree (acquisition date) less any accumulated impairment losses. Goodwill acquired in a business combination is allocated to each cash-generating unit (CGU) that is expected to benefit from the synergies arising from the business acquired. The Company assesses at the end of each reporting period and whenever there is an indication that the asset may be impaired. An impairment loss is recognized if the carrying amount of an asset or a CGU exceeds its recoverable amount. Impairment losses are recognized in profit or loss. Any impairment identified at the CGU level will first reduce the carrying value of goodwill and then be used to reduce the carrying amount of the other assets in the CGU on a pro rata basis. Except for impairment losses in respect of goodwill which are never reversed, an impairment loss is reversed if there has been a change in the estimates used to determine the recoverable amount. An impairment loss is reversed only to the extent that the asset’s carrying amount does not exceed the carrying amount that would have been determined, net of depreciation or amortization, if no impairment loss had been recognized. On disposal of the relevant CGU, the amount of goodwill is included in the determination of the gain or loss on disposal.
Revenue from Contracts with Customers	(7) Revenue from Contracts with Customers The Company recognizes revenue by applying the five-step approach (Step 1: Identify the contract(s) with a customer, Step 2: Identify the performance obligations in the contract, Step 3: Determine the transaction price, Step 4: Allocate the transaction price to the performance obligations in the contract, Step 5: Recognize revenue when the entity satisfied a performance obligation). The Company recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services, excluding amounts collected on behalf of third parties. Also, the Company recognizes revenue when the Company satisfies a performance obligation by transferring a promised good or service to a customer. (i) Sale of goods The Company sells electricity to customers and accounts for the generation, transmission and distribution of electricity together as a single performance obligation. The sale of electricity is recognized at a point in time when electricity has been distributed to the customer. The transaction price includes variable consideration due to the progressive electricity billing system, discounts on electricity bills for government policy purposes and penalties. In situations where electricity had been delivered but not yet billed, the Company also estimates the volume of electricity delivered which can vary significantly as a result of customer usage patterns, customer mix, meter reading schedules, weather, etc. Variable consideration is estimated by using the expected value method which predicts the amount of consideration to which the Company will be entitled and is recognized only to the extent that it is highly probable that a significant reversal in the amount of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is subsequently resolved which is when the customer is billed. (ii) Sale of construction services The Company provides power plant construction and EPC services which are each identified as a single performance obligation and is recognized over time on the estimated progress to completion using the cost-based input method. The Company believes using the cost-based input method represents a faithful depiction of the transfer of services to the customer. Cost incurred towards contract completion include costs associated with direct materials, labor, and other indirect costs related to contract performance. Judgment is required in estimating the costs expected to incur in completing the construction projects which involves estimating future materials, labor, contingencies and other related costs. Revenue is estimated based on the contractual amount; however it can also be affected by uncertainties resulting from unexpected future events. Revenue may be recognized in advance of billing the customer which results in the recording of a contract asset. Once the Company meets the billing criteria and its rights to consideration become unconditional, the contract asset is then transferred to trade receivable. Billing requirements are generally structured around the completion of certain construction milestones. On some instances, contract liability is recognized when the Company receives consideration before being able to recognize revenue. Once revenue recognition conditions are met, the contract liability is subsequently released to revenue. (iii) Sale of services The Company develops electric power resources including the provision of power generation byproducts and O&M services which are accounted for as a separate performance obligation under each contract. The Company recognizes revenue over time when customers consume the benefits provided by the Company under the terms of the service agreement. (iv) Adoption of the cost pass-through tariff system The Company amended the basic supply terms and conditions with the approval of the Ministry of Trade, Industry and Energy (MOTIE) on December 17, 2020. The cost pass-through tariff system has been applied to the electricity rate after January 1, 2021 in accordance with the amendment. The Company expects the adoption of the new system would not affect the existing accounting policies including ‘revenue from contracts with customers’.
Deferred Revenue	(8) Deferred Revenue The Company receives consideration in the form of an item of property, equipment or cash for constructing or acquiring an item of property or equipment in exchange for supplying electricity to its customers. The transaction price is based on the fair value of the consideration received and is initially recorded in deferred revenue included in current and non-current non-financial
Leases	(9) Leases The lessee and the lessor account for each lease component separately from non-lease non-lease non-lease (i) The Company as a lessor In the case of finance leases, the Company recognizes the same amount of the net investment in the lease as finance lease receivables and recognizes interest income using the effective interest rate method. Income from operating leases is recognized using the straight-line basis over the lease term, and lease opening direct costs incurred during the negotiation and contract phase of the operating lease contract are added to the carrying amount of the lease asset and recognized as expenses over the lease term on a straight-line basis. (ii) The Company as a lessee (a) Right-of-use The Company recognizes right-of-use Right-of-use re-measurement right-of-use right-of-use Right-of-use (b) Lease liabilities At the commencement date of the lease, the Company recognizes lease liabilities measured at the present value of lease payments to be made over the lease term. The lease payments include fixed payments (including in-substance In calculating the present value of lease payments, the Company uses its incremental borrowing rate at the lease commencement date if the interest rate implicit in the lease is not readily determinable. After the commencement date, the amount of lease liabilities is increased to reflect the accretion of interest and reduced for the lease payments made. In addition, the carrying amount of lease liabilities is remeasured if there is a modification, a change in the lease term, a change in the in-substance (c) Short-term leases and leases of low-value The Company applies the short-term leases recognition exemption to its short-term leases of machinery and equipment (i.e., those leases that have a lease term of 12 months or less from the commencement date and do not contain a purchase option). It also applies the leases of low-value low-value Book value and changes in book value of right-of-use
Foreign currencies	(10) Foreign currencies Transactions in foreign currencies are translated to the respective functional currencies of the Company entities at exchange rates at the dates of the transactions. Monetary items in foreign currencies are retranslated to the functional currency using the reporting date’s exchange rate. Non-monetary Exchange differences are recognized in profit or loss in the period in which they arise except for: • Exchange differences on foreign currency borrowings relating to assets under construction for future productive use, which are included in the cost of those assets when they are regarded as an adjustment to interest costs on those foreign currency borrowings; • Exchange differences on transactions entered into in order to hedge certain foreign currency risks (refer to note 3.(24) • Derivative financial instruments, including hedge accounting); and • Exchange differences on monetary items receivable from or payable to a foreign operation for which settlement is neither planned nor likely to occur (therefore forming part of the net investment in the foreign operation), which are recognized initially in other comprehensive income and reclassified from equity to profit or loss on disposal or partial disposal of the net investment. For the purpose of presenting financial statements, the assets and liabilities of the Company’s foreign operations are expressed in Korean won using exchange rates prevailing at the end of the reporting period. Income and expense items are translated at the average exchange rates for the period, unless exchange rates fluctuated significantly during that period, in which case the exchange rates at the dates of the transactions are used. Exchange differences arising, if any, are recognized in other comprehensive income and accumulated in equity (if applicable, in non-controlling On the disposal of a foreign operation, the cumulative amount of the exchange differences relating to that foreign operation that have been attributed to the controlling interests shall be reclassified from equity to profit or loss (as a reclassification adjustment). The cumulative amount of the exchange differences relating to that foreign operation that have been attributed to the non-controlling On the partial disposal of a subsidiary that includes a foreign operation, the entity shall re-attribute non-controlling Any goodwill arising on the acquisition of a foreign operation and any fair value adjustments to the carrying amounts of assets and liabilities arising on the acquisition of that foreign operation shall be treated as assets and liabilities of the foreign operation. Thus they shall be expressed in the functional currency of the foreign operation and shall be translated at the closing rate. Such exchange differences shall be recognized in equity.
Borrowing costs	(11) Borrowing costs The Company capitalizes borrowing costs directly attributable to the acquisition, construction or production of a qualifying asset as part of the cost of that asset. Other borrowing costs are recognized in expense as incurred. A qualifying asset is an asset that requires a substantial period of time to get ready for its intended use or sale. Investment income earned on the temporary investment of specific borrowings pending their expenditure on qualifying assets is deducted from the borrowing costs eligible for capitalization. All other borrowing costs are recognized in profit or loss in the period in which they are incurred.
Government grants	(12) Government grants Government grants are not recognized unless there is reasonable assurance that the Company will comply with the grant’s conditions and that the grant will be received. Benefit from a government loan at a below-market interest rate is treated as a government grant, measured as the difference between proceeds received and the fair value of the loan based on prevailing market interest rates. (i) If the Company received grants related to assets, government grants whose primary condition is that the Company purchases, constructs or otherwise acquires long-term assets are deducted in calculating the carrying amount of the asset. The grant is recognized in profit or loss over the life of a depreciable asset as a reduced depreciation expense. (ii) If the Company received grants related to expenses, government grants which are intended to compensate the Company for expenses incurred are recognized as other income (government grants) in profit or loss over the periods in which the Company recognizes the related costs as expenses.
Employee benefits	(13) Employee benefits When an employee has rendered service to the Company during a period, the Company recognizes the contribution payable to a defined contribution plan in exchange for that service as a liability (accrued expense). For defined benefit pension plans and other post-employment benefits, the net periodic pension expense is actuarially determined by “Pension Actuarial System” developed by independent actuaries using the projected unit credit method. The present value of the defined benefit obligation is determined by discounting the estimated future cash outflows using interest rates of high-quality corporate bonds that are denominated in the currency in which the benefits will be paid and that have terms to maturity approximating the terms of the related pension liability. However, if there is not a deep market, market yields on government bonds are used. Net defined benefit liability’s measurement is composed of actuarial gains and losses, return on plan assets excluding net interest on net defined benefit liability, and any change in the effect of the asset ceiling, excluding net interest, which are immediately recognized in other comprehensive income. The actuarial gains or losses recognized in other comprehensive income which will not be reclassified into net profit or loss for later periods are immediately recognized in retained earnings. Past service cost will be recognized as expenses upon the earlier of the date of change or reduction to the plan, or the date of recognizing termination benefits. The retirement benefit obligation recognized in the consolidated statement of financial position represents the present value of the defined benefit obligation as adjusted for unrecognized actuarial gains and losses and unrecognized past service cost, and as reduced by the fair value of plan assets. Any asset resulting from this calculation is limited to unrecognized actuarial losses and past service cost, plus the present value of available refunds and reductions in future contributions to the plan.
Income taxes	(14) Income taxes Income tax expense comprises current and deferred tax. Current tax and deferred tax are recognized in profit or loss except to the extent that it relates to a business combination, or items recognized directly in equity or in other comprehensive income. (i) Current tax Current tax is the expected tax payable or receivable on the taxable profit or loss for the year, using tax rates enacted or substantively enacted at the end of the reporting period and any adjustment to tax payable in respect of previous years. The taxable profit is different from the accounting profit for the period since the taxable profit is calculated excluding the temporary differences, which will be taxable or deductible in determining taxable profit (tax loss) of future periods, and non-taxable non-deductible Current tax assets and liabilities are offset only if, the Company (a) has a legally enforceable right to set off the recognized amounts; and (b) intends either to settle on a net basis, or to realize the asset and settle the liability simultaneously. (ii) Deferred tax Deferred tax is recognized, using the asset-liability method, in respect of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for taxation purposes. A deferred tax liability is recognized for all taxable temporary differences. A deferred tax asset is recognized for all deductible temporary differences to the extent that it is probable that taxable profit will be available against which they can be utilized. However, deferred tax is not recognized for the following temporary differences: taxable temporary differences arising on the initial recognition of goodwill, or the initial recognition of assets or liabilities in a transaction that is not a business combination and that affects neither accounting profit or loss nor taxable income. In certain circumstances such as when accounting for leases or decommissioning costs of nuclear power plants, the carrying amount of the asset recorded is equal to the liability recognized at initial recognition. When recording its deferred tax balances, the Company considers these assets and liabilities separately on a gross basis. Accordingly, the taxable temporary difference relating to the asset and the deductible temporary difference relating to the liability are separately recognized and presented on a net basis in the consolidated financial statements. The measurement of deferred tax liabilities and deferred tax assets reflects the tax consequences that would follow from the manner in which the Company expects, at the end of the reporting period, to recover or settle the carrying amount of its assets and liabilities. Deferred tax assets or deferred tax liabilities on investment properties measured at fair value, unless any contrary evidence exists, are measured using the assumption that the carrying amount of the property will be recovered entirely through sale. The Company recognizes a deferred tax liability for all taxable temporary differences associated with investments in subsidiaries, associates, and interests in joint ventures, except to the extent that the Company is able to control the timing of the reversal of the temporary difference and it is probable that the temporary difference will not reverse in the foreseeable future. The Company recognizes a deferred tax asset for all deductible temporary differences arising from investments in subsidiaries and associates, to the extent that it is probable that the temporary difference will reverse in the foreseeable future and taxable profit will be available against which the temporary difference can be utilized. The carrying amount of a deferred tax asset is reviewed at the end of each reporting period and reduces the carrying amount to the extent that it is no longer probable that sufficient taxable profit will be available to allow the benefit of part or all of that deferred tax asset to be utilized. Deferred tax assets and liabilities are measured at the tax rates that are expected to apply to the period when the asset is realized or the liability is settled, based on tax rates (and tax laws) that have been enacted or substantively enacted by the end of the reporting period. The measurement of deferred tax liabilities and deferred tax assets reflects the tax consequences that would follow from the manner in which the Company expects, at the end of the reporting period to recover or settle the carrying amount of its assets and liabilities. Deferred tax assets and liabilities are offset only if there is a legally enforceable right to offset the related current tax liabilities and assets, and they relate to income taxes levied by the same tax authority and they intend to settle current tax liabilities and assets on a net basis. (iii) Current and deferred tax for the year Current and deferred tax are recognized in profit or loss, except when they relate to items that are recognized in other comprehensive income or directly in equity, in which case, the current and deferred tax are also recognized in other comprehensive income or directly in equity respectively. Where current tax or deferred tax arises from the initial accounting for a business combination, the tax effect is included in the accounting for the business combination.
Property, plant and equipment	(15) Property, plant and equipment Property, plant and equipment are initially measured at cost and after initial recognition, are carried at cost less accumulated depreciation and accumulated impairment losses. The cost of property, plant and equipment includes expenditures arising directly from the construction or acquisition of the asset, any costs directly attributable to bringing the asset to the location and condition necessary for it to be capable of operating in the manner intended by management and the initial estimate of the costs of dismantling and removing the item and restoring the site on which it is located. Subsequent costs are recognized in the carrying amount of property, plant and equipment at cost or, if appropriate, as separate items if it is probable that future economic benefits associated with the item will flow to the Company and the cost of the item can be measured reliably. The carrying amount of the replaced part is derecognized. The costs of the day-to-day Property, plant and equipment, except for land, are depreciated on a straight-line basis over estimated useful lives that appropriately reflect the pattern in which the asset’s future economic benefits are expected to be consumed. For loaded nuclear fuel related to long-term raw materials and spent nuclear fuels related to asset retirement costs, the Company uses the unit-of-production The estimated useful lives of the Company’s property, plant and equipment are as follows: Useful lives (years) Buildings 8 ~ 40 Structures 5 ~ 50 Machinery 2 ~ 32 Vehicles 3 ~ 8 Loaded heavy water 30 Asset retirement costs 18, 30, 40, 60 Right-of-use 1 ~ 65 Ships 9 Others 4 ~ 15 A component that is significant compared to the total cost of property, plant and equipment is depreciated over its separate useful life. Depreciation methods, residual values and useful lives of property, plant and equipment are reviewed at the end of each reporting period and if change is deemed appropriate, it is treated as a change in accounting estimate. Property, plant and equipment are derecognized on disposal, or when no future economic benefits are expected from its use or disposal. Gains or losses arising from derecognition of an item of property, plant and equipment, measured as the difference between the net disposal proceeds and the carrying amount of the asset, are recognized in profit or loss when the asset is derecognized.
Investment property	(16) Investment property A property held for the purpose of earning rentals or benefiting from capital appreciation is classified as investment property. Investment property is initially measured at its cost. Transaction costs are included in the initial measurement. Subsequently, investment property is carried at depreciated cost less any accumulated impairment losses. Subsequent costs are recognized in the carrying amount of investment property at cost or, if appropriate, as separate items if it is probable that future economic benefits associated with the item will flow to the Company and the cost of the item can be measured reliably. The carrying amount of the replaced part is derecognized. The costs of the day-to-day Investment properties except for land, are depreciated on a straight-line basis over 8 ~ 40 years as estimated useful lives. The estimated useful lives, residual values and depreciation method are reviewed at the end of each reporting period, with the effect of any changes in estimate accounted for on a prospective basis. An investment property is derecognized upon disposal or when the investment property is permanently withdrawn from use and no future economic benefits are expected from the disposal. Any gain or loss arising on derecognition of the property (calculated as the difference between the net disposal proceeds and the carrying amount of the asset) is included in profit or loss in the period in which the property is derecognized.
Intangible assets	(17) Intangible assets (i) Intangible assets acquired separately Intangible assets with finite useful lives that are acquired separately are carried at cost less accumulated amortization and accumulated impairment losses. Amortization is recognized on a straight-line basis over their estimated useful lives. The estimated useful life and amortization method are reviewed at the end of each reporting period, with the effect of any changes in estimate being accounted for on a prospective basis. Intangible assets with indefinite useful lives that are acquired separately are carried at cost less accumulated impairment losses. (ii) Research and development Expenditure on research activities is recognized as an expense in the period in which it is incurred. An internally-generated intangible asset arising from development (or from the development phase of an internal project) is recognized if, and only if, all of the following have been demonstrated: • The technical feasibility of completing the intangible asset so that it will be available for use or sale; • The intention to complete the intangible asset and use or sell it; • The ability to use or sell the intangible asset; • How the intangible asset will generate probable future economic benefits; • The availability of adequate technical, financial and other resources to complete the development and to use or sell the intangible asset; and • The ability to measure reliably the expenditure attributable to the intangible asset during its development. The amount initially recognized for internally-generated intangible assets is the sum of the expenditure incurred from the date when the intangible asset first meets the recognition criteria listed above. When the development expenditure does not meet the criteria listed above, an internally-generated intangible asset cannot be recognized and the expenditure is recognized in profit or loss in the period in which it is incurred. Internally-generated intangible assets are reported at cost less accumulated amortization and accumulated impairment losses. The estimated useful lives and amortization methods of the Company’s intangible assets are as follows: Useful lives (years) Amortization methods Usage rights for donated assets 10 ~ 30 Straight line Software 4, 5 Straight line Industrial rights 5 ~ 10 Straight line Development expenditures 5 Straight line Leasehold rights 8 ~ 10 Straight line Others 3 ~ 50 or indefinite Straight line Mining rights — Unit of production (iii) Intangible assets acquired in a business combination Intangible assets that are acquired in a business combination are recognized separately from goodwill are initially recognized at their fair value at the acquisition date. Subsequent to initial recognition, intangible assets acquired in a business combination are reported at cost less accumulated amortization and accumulated impairment losses, on the same basis as intangible assets that are acquired separately. (iv) Derecognition of intangible assets An intangible asset is derecognized on disposal, or when no future economic benefits are expected from its use or disposal. Gains or losses arising from derecognition of an intangible asset are measured as the difference between the net disposal proceeds and the carrying amount of the asset, and are recognized in profit or loss when the asset is derecognized.
Greenhouse gas emissions rights (allowances) and obligations	(18) Greenhouse gas emissions rights (allowances) and obligations In accordance with the Act on the Allocation and Trading of Greenhouse Gas Emission Rights and its Enforcement Decree, the Company applies the following accounting policies for greenhouse gas emissions rights and obligations. (i) Greenhouse gas emissions rights Greenhouse gas emissions rights consist of the allowances received free of charge from the government and the ones purchased. The cost of the greenhouse gas emissions rights includes expenditures arising directly from the acquisition and any other costs incurred during normal course of the acquisition. Greenhouse gas emissions rights are held by the Company to fulfill the legal obligation and recorded as intangible assets. To the extent that the portion to be submitted to the government within one year from the end of reporting period, the greenhouse gas emissions rights are classified as current assets. Greenhouse gas emissions rights recorded as intangible assets are initially measured at cost and substantially remeasured at cost less accumulated impairment losses. Greenhouse gas emissions rights are derecognized on submission to the government or when no future economic benefits are expected from its use or disposal. (ii) Greenhouse gas emissions obligations Greenhouse gas emissions obligations are the Company’s present legal obligation to submit the greenhouse gas emissions allowances to the government and recognized when an outflow of resources is probable and a reliable estimate can be made of the amount of the obligation. Greenhouse gas emissions obligations are measured as the sum of the carrying amount of the allocated rights that will be submitted to the government and the best estimate of expenditure required to settle the obligation at the end of the reporting period for any excess emission.
Impairment of non-financial assets other than goodwill	(19) Impairment of non-financial At the end of each reporting period, the Company reviews the carrying amounts of its property, plant and equipment and intangible assets with definite useful lives to determine whether there is any indication that those assets may have been impaired. If any such indication exists, the recoverable amount of the asset is estimated in order to determine the extent of the impairment loss (if any). Where it is not possible to estimate the recoverable amount of an individual asset, the Company estimates the recoverable amount of the cash-generating unit to which the asset belongs. Where a reasonable and consistent basis of allocation can be identified, corporate assets are also allocated to individual cash-generating units, or otherwise they are allocated to the smallest group of cash-generating units for which a reasonable and consistent allocation basis can be identified. Intangible assets with indefinite useful lives and intangible assets not yet available for use are tested for impairment at least annually, and whenever there is an indication that the asset may be impaired. Recoverable amount is the higher of fair value less costs to sell and value in use. In assessing value in use, the estimated future cash flows are discounted to their present value using a pre-tax If the recoverable amount of an asset (or a CGU) is estimated to be less than its carrying amount, the carrying amount of the asset (or CGU) is reduced to its recoverable amount. An impairment loss is recognized immediately in profit or loss. When an impairment loss subsequently reverses, the carrying amount of the asset (or a CGU) is increased to the revised estimate of its recoverable amount, to the extent the increased carrying amount does not exceed the carrying amount that would have been determined had no impairment loss been recognized for the asset (or CGU) in prior years. A reversal of an impairment loss is recognized immediately in profit or loss.
Inventories	(20) Inventories Inventories are measured at the lower of cost and net realizable value. Cost of inventories for inventories in transit are measured by using specific identification method. Cost of inventories, except for those in transit, are measured under the weighted average method and consists of the purchase price, cost of conversion and other costs incurred in bringing the inventories to their present location and condition. Net realizable value is the estimated selling price in the ordinary course of business, less the estimated costs of completion and selling expenses. The amount of any write-down of inventories to net realizable value and all losses of inventories are recognized as an expense in the period the write-down or loss occurs. The amount of any reversal of any write-down of inventories, arising from an increase in net realizable value, are recognized as a reduction in the amount of inventories recognized as an expense in the period in which the reversal occurs.
Provisions	(21) Provisions Provisions are recognized when the Company has a present legal or constructive obligation as a result of a past event, it is probable that an outflow of resources embodying economic benefits will be required to settle the obligation and a reliable estimate can be made of the amount of the obligation. The risks and uncertainties that inevitably surround many events and circumstances are taken into account in reaching the best estimate of a provision. Where the effect of the time value of money is material, provisions are determined at the present value of the expected future cash flows. Where some or all of the expenditures required to settle a provision are expected to be reimbursed by another party, the reimbursement shall be recognized when, and only when, it is virtually certain that reimbursement will be received if the entity settles the obligation. The reimbursement shall be treated as a separate asset. Provisions are reviewed at the end of each reporting period and adjusted to reflect the current best estimates. If it is no longer probable that an outflow of resources embodying economic benefits will be required to settle the obligation, the provision is reversed. (i) Provision for employment benefits The Company determines the provision for employment benefits as the incentive payments based on the results of the individual performance evaluation or management assessment. (ii) Provision for decommissioning costs of nuclear power plants The Company records the fair value of estimated decommissioning costs as a liability in the period in which the Company incurs a legal obligation associated with retirement of long-lived assets that result from acquisition, construction, development and/or normal use of the assets. Accretion expense consists of period-to-period (iii) Provision for disposal of spent nuclear fuel Under the Radioactive Waste Management Act, the Company is levied to pay the spent nuclear fuel fund for the management of spent nuclear fuel. The Company recognizes the provision of present value of the payments. (iv) Provision for low and intermediate radioactive wastes Under the Radioactive Waste Management Act, the Company recognizes the provision for the disposal of low and intermediate radioactive wastes in best estimate of the expenditure required to settle the present obligation. (v) Provision for Polychlorinated Biphenyls (“PCBs”) Under the Persistent Organic Pollutants Control Act, enacted in 2007, the Company is required to remove PCBs, a toxin, from the insulating oil of its transformers by 2025. As a result of the enactments, the Company is required to inspect the PCBs contents of transformers and dispose of PCBs in excess of safety standards under the legally settled procedures. The Company’s estimates and assumptions used to determine fair value can be affected by many factors, such as the estimated costs of inspection and disposal, inflation rate, discount rate, regulations and the general economy. (vi) Provisions for the power plant region support programs The power plant region support programs consist of scholarship programs to local students, local economy support programs, local culture support programs, environment development programs, and local welfare programs. The Company recognizes the provision in relation to the power plant region support programs. (vii) Provisions for the transmission and transformation facilities-neighboring areas support The Company has present obligation to conduct certain programs to support neighboring areas of our transmission and transformation facilities under the Act on Assistance to Electric Power Plants-Neighboring Areas. The Company recognizes the provision of estimated amount to fulfill the obligation. (viii) Renewable Portfolio Standard (“RPS”) provisions RPS program is required to generate a specified percentage of total electricity to be generated in the form of renewable energy and provisions are recognized for the governmental regulations to require the production of energies from renewable energy sources such
Financial instruments	(22) Financial instruments The Company recognizes financial assets and financial liabilities in the consolidated statement of financial position when the Company becomes a party to the contractual provisions of the instrument. Upon initial recognition, financial assets and financial liabilities are measured at their fair value plus, in the case of a financial asset or financial liabilities not at fair value through profit or loss, transaction costs that are directly attributable to the asset’s acquisition or issuance. (i) Classification and measurement of financial assets The Company classifies financial assets into three principal categories; measured at amortized cost, fair value through other comprehensive income (FVOCI) and fair value through profit or loss (FVTPL) based on the business model in which assets are managed and their cash flow characteristics. The Company assesses the hybrid financial instrument in which derivatives embedded as a whole for classification. Cash flow characteristics Business model Solely payments of Other than SPPI To collect contractual cash flows Amortized cost FVTPL (*2) Both collecting contractual cash flows and selling financial assets FVOCI (*1) To sell financial assets FVTPL (*1) To eliminate or reduce an accounting mismatch, the Company may elect to recognize the amount of change in fair value in profit or loss. (*2) On initial recognition of an equity investment that is not held for trading, the Company may irrevocably elect to present subsequent changes in the investment’s fair value in OCI. ① A financial asset is measured at amortized cost if it meets both of the following conditions and is not designated as at FVTPL: 1) it is held within a business model whose objective is to hold assets to collect contractual cash flows; and 2) its contractual terms of the financial asset give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding. ② A financial asset is measured at FVOCI if it meets both of the following conditions and is not designated as at FVTPL: 1) it is held within a business model whose objective is achieved by both collecting contractual cash flows and selling financial assets; and 2) its contractual terms of the financial asset give rise on specified dates to cash flow that are solely payments of principal and interest on the principal amount outstanding. ③ All financial assets not classified as measured at amortized cost or FVOCI as described above are measured at FVTPL. On initial recognition of equity investment that is not held for trading, the Company may irrevocably elect to present subsequent changes in fair value in OCI, and will not reclassify (recycle) those items in OCI to profit or loss subsequently. (ii) Classification and measurement of financial liabilities Financial liabilities are classified as FVTPL or other financial liabilities. ① A financial liability is classified as at FVTPL if it is classified as held-for-trading, ② A non-derivative (iii) Impairment: Financial assets and contract assets The Company applies a forward-looking ‘expected credit loss’ (ECL) model for debt instruments, lease receivables, contractual assets, loan commitments and financial guarantee contracts. The Company recognizes loss allowances measured on either of the 12-month Classification Loss allowances Stage 1 Credit risk has not increased significantly since the initial recognition 12-month ECL: ECLs that resulted from possible default events within the 12 months after the reporting date Stage 2 Credit risk has increased significantly since the initial recognition Lifetime ECL: ECL that resulted from all possible default events over the expected life of a financial instrument Stage 3 Credit-impaired Under IFRS 9, the Company always measures the loss allowance at an amount equal to lifetime expected credit losses for trade receivables or contract assets that result from transactions that are within the scope of IFRS 15 and that do not contain a significant financing component in accordance with IFRS 15, and if the trade receivables or contract assets include a significant financing component, the Company may choose as its accounting policy to measure the loss allowance at an amount equal to lifetime expected credit losses. The Company has chosen to measure the loss allowance at an amount equal to lifetime expected credit losses for the trade receivables, contract assets and lease receivables that contain a significant financing component. (iv) Derecognition The Company derecognizes a financial asset when the contractual rights to the cash flows from the financial asset expire, or it transfers the rights to receive the contractual cash flows in a transaction in which substantially all of the risks and rewards of ownership of the financial asset are transferred or in which the Company neither transfers nor retains substantially all of the risks and rewards of ownership and it does not retain control of the financial asset. The Company enters into transactions whereby it transfers assets recognized in its consolidated statement of financial position, but retains either all or substantially all of the risks and rewards of the transferred assets. In these cases, the transferred assets are not derecognized. The Company derecognizes a financial liability when its contractual obligations are discharged or cancelled or expire. On derecognition of a financial liability, the difference between the carrying amount extinguished and the consideration paid (including any non-cash
Service Concession Arrangements	(23) Service concession arrangements The Company recognizes revenues from construction services and operating services related to service concession arrangements in accordance with IFRS 15 ‘Revenue from Contracts with Customers’. The Company recognizes a financial asset to the extent that it has an unconditional contractual right to receive cash or another financial asset for the construction services and an intangible asset to the extent that it receives a right (license) to charge users of the public service. Borrowing costs attributable to the arrangement are recognized as an expense in the period in which they are incurred unless the Company has a contractual right to receive an intangible asset (a right to charge users of the public service). In this case, borrowing costs attributable to the arrangement are capitalized during the construction phase of the arrangement.
Derivative financial instruments, including hedge accounting	(24) Derivative financial instruments, including hedge accounting The Company enters into a variety of derivative arrangements to manage its exposure to interest rate and foreign exchange rate risk, including foreign exchange forward contracts, interest rate swaps and cross currency swaps and others. Derivatives are initially recognized at fair value. Subsequent to initial recognition, derivatives are measured at fair value. The resulting gain or loss is recognized in profit or loss immediately unless the derivative is designated and effective as a hedging instrument, in such case the timing of the recognition in profit or loss depends on the nature of the hedge relationship. A derivative with a positive fair value is recognized as a financial asset; a derivative with a negative fair value is recognized as a financial liability. A derivative is presented as a non-current non-current (i) Separable embedded derivatives Derivatives embedded in other financial instruments or other host contracts are treated as separate derivatives when their risks and characteristics are not closely related to those of the host contracts and when the host contracts are not measured at FVTPL. An embedded derivative is presented as a non-current non-current (ii) Hedge accounting The Company designates certain hedging instruments, which include derivatives, embedded derivatives and non-derivatives At the inception of the hedge relationship, the entity documents the relationship between the hedging instrument and the hedged item, along with its risk management objectives and its strategy for undertaking various hedge transactions. Furthermore, at the inception of the hedge and on an ongoing basis, the Company documents whether the hedging instrument is highly effective in offsetting changes in fair values or cash flows of the hedged item. (iii) Fair value hedges Changes in the fair value of derivatives that are designated and qualify as fair value hedges are recognized in profit or loss immediately, together with any changes in the fair value of the hedged asset or liability that are attributable to the hedged risk. The changes in the fair value of the hedging instrument and the change in the hedged item attributable to the hedged risk relating to the hedged items are recognized in the consolidated statements of comprehensive income (loss). Hedge accounting is discontinued when the Company revokes the hedging relationship, when the hedging instrument expires or is sold, terminated, or exercised, or when it no longer qualifies for hedge accounting. The fair value adjustment to the carrying amount of the hedged item arising from the hedged risk is amortized and recognized as profit or loss from that date. (iv) Cash flow hedges The effective portion of changes in the fair value of derivatives that are designated and qualify as cash flow hedges is recognized in other comprehensive income. The gain or loss relating to the ineffective portion is recognized immediately in profit or loss, and is included in the ‘finance income and expense’. Amounts previously recognized in other comprehensive income and accumulated in equity are reclassified to profit or loss in the periods when the hedged item is recognized in profit or loss, in the same line of the consolidated statement of comprehensive income (loss) as the recognized hedged item. However, when the forecast transaction that is hedged results in the recognition of a non-financial non-financial non-financial non-financial Hedge accounting is discontinued when the Company revokes the hedging relationship, when the hedging instrument expires or is sold, terminated, or exercised, or it no longer qualifies for hedge accounting. Any gain or loss accumulated in equity at that time remains in equity and is recognized when the forecast transaction is ultimately recognized in profit or loss. When a forecast transaction is no longer expected to occur, the gain or loss accumulated in equity is recognized immediately in profit or loss.
Assets held-for-sale	(25) Assets held-for-s a The Company classifies non-current assets-held-for-sale Such non-current

Reporting Entity (Description_2

Reporting Entity (Description of the controlling company) (Tables)	12 Months Ended
	Dec. 31, 2022
Reporting Entity (Description of the controlling company) [Abstract]
Summary of the Company's Shareholders	As of December 31, 2022, KEPCO’s share capital amounts to ￦3,209,820 million and KEPCO’s shareholders are as follows: Number of Percentage of The Government of the Republic of Korea 116,841,794 18.20 % Korea Development Bank (KDB) 211,235,264 32.90 % Foreign investors 88,959,339 13.86 % Other 224,927,680 35.04 % 641,964,077 100.00 %

Basis of Preparation (Tables)

Basis of Preparation (Tables)	12 Months Ended
	Dec. 31, 2022
Disclosure of Basis of Preparation [Abstract]
Summary of Change in Accounting Policy	① The impacts on the Company’s consolidated statement of financial position as of December 31, 2021 are as follows: Original carrying amount Adjustment New carrying amount In millions of won Current assets ￦ 22,050,845 — 22,050,845 Non-current 189,058,025 14,857 189,072,882 Total Assets 211,108,870 14,857 211,123,727 Current liabilities 31,732,220 — 31,732,220 Non-current 114,064,801 — 114,064,801 Total Liabilities 145,797,021 — 145,797,021 Contributed capital 4,053,578 — 4,053,578 Retained earnings 45,246,982 11,262 45,258,244 Other components of equity 14,468,450 — 14,468,450 Non-controlling 1,542,839 3,595 1,546,434 Total Equity 65,311,849 14,857 65,326,706 Total Liabilities and Equity ￦ 211,108,870 14,857 211,123,727 ② The impacts on the Company’s consolidated statement of comprehensive income Original carrying amount Adjustment New carrying amount In millions of won except per share information Sales ￦ 60,574,819 98,768 60,673,587 Cost of sales (63,559,178 ) (85,112 ) (63,644,290 ) Gross loss (2,984,359 ) 13,656 (2,970,703 ) Selling and administrative expenses (2,875,784 ) (12 ) (2,875,796 ) Operating loss (5,860,143 ) 13,644 (5,846,499 ) Other non-operating 372,921 — 372,921 Other non-operating (257,932 ) — (257,932 ) Other gains, net 8,519 — 8,519 Finance income 1,402,614 — 1,402,614 Finance expenses (3,245,777 ) — (3,245,777 ) Profit related to associates, joint ventures and subsidiaries 494,584 — 494,584 Loss before income tax (7,085,214 ) 13,644 (7,071,570 ) Income tax benefit 1,855,989 — 1,855,989 Net Loss for the period (5,229,225 ) 13,644 (5,215,581 ) Loss attributable to owners of the controlling company (5,315,055 ) 10,533 (5,304,522 ) Profit attributable to non-controlling 85,830 3,111 88,941 Other comprehensive income (loss) 599,614 — 599,614 Total comprehensive income (loss) for the period (4,629,611 ) 13,644 (4,615,967 ) Total comprehensive loss attributable to owners of the controlling company (4,754,046 ) 10,533 (4,743,513 ) Total comprehensive income (attributable to non-controlling 124,435 3,111 127,546 Loss per share (in won) ￦ (8,279 ) 16 (8,263 ) ③ The impacts on the Company’s consolidated statement of cash flows for the year ended December 31, 2021 are as follows: Original carrying amount Adjustment New carrying amount In millions of won Cash flows from operating activities ￦ 4,473,186 18,192 4,491,378 Cash flows from investing activities (12,354,328 ) (18,192 ) (12,372,520 ) Cash flows from financing activities 8,435,077 — 8,435,077 ① The impacts on the Company’s consolidated statement of financial position as of January 1, 2021 are as follows: Original carrying Adjustment New carrying In millions of won Current assets ￦ 20,561,941 — 20,561,941 Non-current assets 182,580,170 1,214 182,581,384 Total Assets 203,142,111 1,214 203,143,325 Current liabilities 25,881,222 — 25,881,222 Non-current liabilities 106,594,043 — 106,594,043 Total Liabilities 132,475,265 — 132,475,265 Contributed capital 4,053,578 — 4,053,578 Retained earnings 51,133,601 730 51,134,331 Other components of equity 14,109,501 — 14,109,501 Non-controlling interests 1,370,166 484 1,370,650 Total Equity 70,666,846 1,214 70,668,060 Total Liabilities and Equity 203,142,111 1,214 203,143,325 ② The impacts on the Company’s consolidated statement of comprehensive income (loss) for the year ended December 31, 2020 are as follows: Original carrying Adjustment New carrying In millions of won except per share information Sales ￦ 57,925,837 797 57,926,634 Cost of sales (51,804,596 ) 417 (51,804,179 ) Gross loss 6,121,241 1,214 6,122,455 Selling and administrative expenses (2,678,443 — (2,678,443 ) Operating loss 3,442,798 1,214 3,444,012 Other non-operating income 1,036,448 — 1,036,448 Other non-operating expense (417,720 — (417,720 ) Other gains, net 35,094 — 35,094 Finance income 1,510,249 — 1,510,249 Finance expenses (2,896,443 — (2,896,443 ) Profit related to associates, joint ventures and subsidiaries 281,107 — 281,107 Loss before income tax 2,991,533 1,214 2,992,747 Income tax benefit (899,064 — (899,064 ) Net Loss for the period 2,092,469 1,214 2,093,683 Loss attributable to owners of the controlling company 1,991,347 730 1,992,077 Profit attributable to non-controlling interests 101,122 484 101,606 Other comprehensive income (loss) (219,841 — (219,841 ) Total comprehensive income (loss) for the period 1,872,628 1,214 1,873,842 Total comprehensive loss attributable to owners of the controlling company 1,802,824 730 1,803,554 Total comprehensive income (attributable to non-controlling interests 69,804 484 70,288 Loss per share (in won) ￦ 3,102 — 3,102 ③ The impacts on the Company’s consolidated statement of cash flows for the year ended December 31, 2020 are as follows: Original carrying amount Adjustment New carrying In millions of won Cash flows from operating activities ￦ 13,208,473 1 13,208,474 Cash flows from investing activities (14,831,811 (1 ) (14,831,812 ) Cash flows from financing activities 1,880,824 — 1,880,824

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2022
Disclosure Of Significant Accounting Policies [Abstract]
Summary of Property, Plant and Equipment, Estimated Useful Lives	The estimated useful lives of the Company’s property, plant and equipment are as follows: Useful lives (years) Buildings 8 ~ 40 Structures 5 ~ 50 Machinery 2 ~ 32 Vehicles 3 ~ 8 Loaded heavy water 30 Asset retirement costs 18, 30, 40, 60 Right-of-use 1 ~ 65 Ships 9 Others 4 ~ 15
Summary of Intangible Assets, Estimated Useful Lives	The estimated useful lives and amortization methods of the Company’s intangible assets are as follows: Useful lives (years) Amortization methods Usage rights for donated assets 10 ~ 30 Straight line Software 4, 5 Straight line Industrial rights 5 ~ 10 Straight line Development expenditures 5 Straight line Leasehold rights 8 ~ 10 Straight line Others 3 ~ 50 or indefinite Straight line Mining rights — Unit of production
Summary of Classification and Measurement of Financial Assets	The Company assesses the hybrid financial instrument in which derivatives embedded as a whole for classification. Cash flow characteristics Business model Solely payments of Other than SPPI To collect contractual cash flows Amortized cost FVTPL (*2) Both collecting contractual cash flows and selling financial assets FVOCI (*1) To sell financial assets FVTPL (*1) To eliminate or reduce an accounting mismatch, the Company may elect to recognize the amount of change in fair value in profit or loss. (*2) On initial recognition of an equity investment that is not held for trading, the Company may irrevocably elect to present subsequent changes in the investment’s fair value in OCI.

Segment, Geographic and Other_2

Segment, Geographic and Other Information (Tables)	12 Months Ended
	Dec. 31, 2022
Disclosure of operating segments [abstract]
Summary of Financial Information of the Segments	(2) Financial information of the segments for the years ended December 31, 2020, 2021 and 2022, respectively, are as follows: 2020 Segment Total segment Intersegment Revenue Depreciation Interest Interest Profit (loss) Employee Loss on Increase in Operating profit (loss) In millions of won Transmission ￦ 57,345,933 1,224,602 56,121,331 3,836,355 48,220 737,973 169,176 190,302 236,727 731,194 3,045,912 Electric power generation (Nuclear) 9,938,941 9,817,147 121,794 3,564,120 25,581 503,485 (4,905 ) 86,672 — 691,052 1,168,833 Electric power generation (Non-nuclear) 20,329,611 19,552,376 777,235 4,034,024 20,843 622,346 115,096 112,775 17,679 346,195 (172,884 ) Plant maintenance & engineering service 2,703,472 2,283,333 420,139 119,056 11,789 1,250 1,740 101,255 — 230,264 197,553 Others 1,582,798 1,096,663 486,135 122,092 167,005 162,843 — 50,889 940 3,711 149,607 Consolidation (33,974,121 ) (33,974,121 ) — (127,628 ) (30,852 ) (32,472 ) — (49,605 ) — (169,651 ) (291,187 ) ￦ 57,926,634 — 57,926,634 11,548,019 242,586 1,995,425 281,107 492,288 255,346 1,832,765 4,097,834 Finance income 1,510,249 Finance expense (2,896,443 ) Gain related to associates, joint ventures and subsidiaries 281,107 Loss before income tax ￦ 2,992,747 2021 Segment Total segment Intersegment Revenue from external Depreciation Interest Interest Profit (loss) Employee Loss on Increase in Operating profit (loss) In millions of won Transmission and distribution ￦ 58,999,388 1,672,776 57,326,612 3,990,464 36,831 678,986 391,116 193,412 202,262 1,194,643 (7,244,319 ) Electric power generation (Nuclear) 9,324,391 9,207,516 116,875 3,611,594 22,209 477,512 (18,146 ) 86,730 — 680,358 762,164 Electric power generation (Non-nuclear) 25,928,596 24,518,167 1,410,429 4,182,470 22,226 624,391 109,765 121,020 5,672 285,152 370,440 Plant maintenance & engineering service 2,805,785 2,370,900 434,885 121,493 9,515 933 11,849 94,269 — 213,500 245,360 Others 2,018,997 1,295,423 723,574 159,222 158,680 162,345 — 52,698 — 2,981 208,139 Consolidation adjustments (39,064,782 ) (39,064,782 ) — (122,751 ) (27,587 ) (29,710 ) — (36,187 ) — 89,818 (64,775 ) ￦ 60,012,375 — 60,012,375 11,942,492 221,874 1,914,457 494,584 511,942 207,934 2,466,452 (5,722,991 ) Finance income 1,402,614 Finance expense (3,245,777 ) Gain related to 494,584 Profit before income tax ￦ (7,071,570 ) 2022 Segment Total segment Intersegment Revenue from external customers Depreciation Interest Interest Profit (loss) ventures and Employee Loss on Increase in Operating profit (loss) In millions of won Transmission and distribution ￦ 68,239,707 1,922,354 66,317,353 4,130,004 67,076 1,420,802 980,146 180,114 157,784 611,534 (33,623,874 ) Electric power generation (Nuclear) 10,386,091 10,254,271 131,820 4,034,774 45,789 557,218 (753 ) 82,466 — 624,221 761,109 Electric power generation (Non-nuclear) 41,944,339 39,252,851 2,691,488 4,091,081 53,242 694,559 329,112 140,067 — 619,947 289,001 Plant maintenance & engineering service 2,975,062 2,516,699 458,363 123,168 14,003 1,405 1,886 82,070 — 213,671 239,529 Others 2,750,231 1,803,231 947,000 211,719 195,966 195,860 — 53,017 3,125 9,463 333,547 Consolidation adjustments (55,749,406 ) (55,749,406 ) — (129,334 ) (35,323 ) (51,298 ) — (52,034 ) — 68,143 (239,843 ) ￦ 70,546,024 — 70,546,024 12,461,412 340,753 2,818,546 1,310,391 485,700 160,909 2,146,979 (32,240,531 ) Finance income 1,833,312 Finance expense (4,746,791 ) Gain related to associates, joint ventures and subsidiaries 1,310,391 Profit before income tax ￦ (33,843,619 )
Summary of Information Related to Segment Assets and Liabilities	(3) Information related to segment assets and segment liabilities as of and for the years ended December 31, 2021 and 2022 are as follows: 2021 Segment Segment assets Investments Acquisition of non-current Segment In millions of won Transmission and distribution ￦ 115,578,517 4,700,863 6,754,298 68,531,927 Electric power generation (Nuclear) 64,628,651 141,885 1,959,479 38,361,337 Electric power generation (Non-nuclear) 57,310,164 2,575,019 3,341,960 35,803,289 Plant maintenance & engineering service 3,672,366 53,617 110,330 1,086,926 Others 10,870,812 — 645,760 4,961,880 Segment totals 252,060,510 7,471,384 12,811,827 148,745,359 Consolidation adjustments: Elimination of inter-segment amounts (41,701,400 ) — (12,001 ) (8,101,011 ) Equity method adjustment 1,866,554 — — — Deferred taxes 1,881 — — 5,248,627 Others (1,103,818 ) — — (95,954 ) (40,936,783 ) — (12,001 ) (2,948,338 ) Consolidated totals ￦ 211,123,727 7,471,384 12,799,826 145,797,021 2022 Segment Segment assets Investments Acquisition of non-current Segment In millions of won Transmission and distribution ￦ 131,023,727 5,678,141 6,055,179 108,963,058 Electric power generation (Nuclear) 69,129,625 143,304 2,008,409 42,843,974 Electric power generation (Non-nuclear) 69,468,039 3,113,918 3,547,815 40,428,907 Plant maintenance & engineering service 4,051,157 56,685 200,338 1,272,408 Others 12,895,981 — 839,885 5,796,718 Segment totals 286,568,529 8,992,048 12,651,626 199,305,065 Consolidation adjustments: Elimination of inter-segment amounts (43,801,723 ) — (38,633 ) (9,304,648 ) Equity method adjustment 2,859,623 — — — Deferred taxes (452 ) — — 2,801,832 Others (10,820,983 ) — — 2,489 (51,763,535 ) — (38,633 ) (6,500,327 ) Consolidated totals ￦ 234,804,994 8,992,048 12,612,993 192,804,738
Summary of Geographic Information	(4) Geographic information Electricity sales, the main operations of the Company, are conducted in the Republic of Korea. The following information on revenue from external customers and non-current Revenue from external customers Non-current (*2) Geographical unit 2020 2021 2022 2020 2021 2022 In millions of won Domestic ￦ 56,775,375 58,771,252 69,142,730 173,673,478 178,760,564 183,707,117 Overseas (*1) 1,151,259 1,241,123 1,403,294 2,831,925 3,572,784 4,724,416 ￦ 57,926,634 60,012,375 70,546,024 176,505,403 182,333,348 188,431,533 (*1) Middle East and other Asian countries make up the majority of overseas revenue and non-current non-current (*2) The amounts exclude financial assets and deferred tax assets.

Classification of Financial I_2

Classification of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2022
Disclosure of detailed information about financial instruments [abstract]
Classification of Financial Assets	(1) Classification of financial assets as of December 31, 2021 and 2022 are as follows: 2021 Financial assets at fair value through profit or Financial assets at fair value through other comprehensive income Financial assets at amortized cost Derivative assets (applying hedge accounting) Total In millions of won Current assets Cash and cash equivalents ￦ — — 2,635,238 — 2,635,238 Current financial assets Current financial assets at fair value through profit or loss 360,833 — — — 360,833 Current financial assets at amortized costs — — 15,422 — 15,422 Current derivative assets 93,374 — — 33,564 126,938 Other financial assets — — 1,365,603 — 1,365,603 Trade and other receivables — — 8,122,415 — 8,122,415 454,207 — 12,138,678 33,564 12,626,449 Non-current Non-current Non-current 672,031 — — — 672,031 Non-current — 435,107 — — 435,107 Non-current — — 9,851 — 9,851 Non-current 349,653 — — 171,192 520,845 Other financial assets — — 1,271,976 — 1,271,976 Trade and other receivables — — 1,906,861 — 1,906,861 1,021,684 435,107 3,188,688 171,192 4,816,671 ￦ 1,475,891 435,107 15,327,366 204,756 17,443,120 2022 Financial assets at fair value through profit or loss Financial assets at fair value Financial assets at amortized cost Derivative assets (applying hedge accounting) Total In millions of won Current assets Cash and cash equivalents ￦ — — 3,234,780 — 3,234,780 Current financial assets Current financial assets at fair value through profit or loss 3,181,791 — — — 3,181,791 Current financial assets at amortized costs — — 16,762 — 16,762 Current derivative assets 154,730 — — 134,873 289,603 Other financial assets — — 798,819 — 798,819 Trade and other receivables — — 10,461,822 — 10,461,822 3,336,521 — 14,512,183 134,873 17,983,577 Non-current Non-current Non-current 527,717 — — — 527,717 Non-current — 502,829 — — 502,829 Non-current — — 10,236 — 10,236 Non-current 538,342 — — 190,079 728,421 Other financial assets — — 1,567,632 — 1,567,632 Trade and other receivables — — 2,153,080 — 2,153,080 1,066,059 502,829 3,730,948 190,079 5,489,915 ￦ 4,402,580 502,829 18,243,131 324,952 23,473,492
Classification of Financial Liabilities	(2) Classification of financial liabilities as of December 31, 2021 and 2022 are as follows: 2021 Financial liabilities at fair value through profit or loss Financial liabilities recognized at Derivative liabilities (applying hedge Total In millions of won Current liabilities Borrowings ￦ — 4,382,218 — 4,382,218 Debt securities — 9,647,616 — 9,647,616 Derivative liabilities 6,838 — 453 7,291 Trade and other payables — 8,153,426 — 8,153,426 6,838 22,183,260 453 22,190,551 Non-current Borrowings — 2,265,624 — 2,265,624 Debt securities — 64,234,055 — 64,234,055 Derivative liabilities 49,418 — 21,322 70,740 Trade and other payables — 5,996,498 — 5,996,498 49,418 72,496,177 21,322 72,566,917 ￦ 56,256 94,679,437 21,775 94,757,468 2022 Financial liabilities at fair value through profit or loss Financial liabilities Derivative liabilities Total In millions of won Current liabilities Borrowings ￦ — 12,457,853 — 12,457,853 Debt securities — 10,201,149 — 10,201,149 Derivative liabilities 44,994 — — 44,994 Trade and other payables — 11,983,549 — 11,983,549 44,994 34,642,551 — 34,687,545 Non— current liabilities Borrowings — 2,962,323 — 2,962,323 Debt securities — 94,984,040 — 94,984,040 Derivative liabilities 362,252 — 25,505 387,757 Trade and other payables — 5,638,914 — 5,638,914 362,252 103,585,277 25,505 103,973,034 ￦ 407,246 138,227,828 25,505 138,660,579
Classification of Comprehensive Income (Loss) From Financial Instruments	(3) Classification of comprehensive income (loss) from financial instruments for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Cash and cash equivalents Interest income ￦ 9,419 12,692 51,872 Gain (loss) on foreign currency transactions and translations (15,911 ) 34,923 22,158 Financial assets at fair value through profit or loss Interest income 19,114 18,415 58,540 Dividends income 4,734 2,949 1,994 Gain (loss) on valuation of derivatives (52,447 ) 450,896 336,049 Gain (loss) on transaction of derivatives 36,563 54,352 205,298 Gain (loss) on valuation of financial assets 5,508 8,858 (37,230 ) Gain (loss) on disposal of financial assets 11,344 4,221 9,358 Financial assets at fair value through other comprehensive income Dividends income 2,582 7,573 26,881 Financial assets at amortized cost Interest income 612 797 1,308 Gain (loss) on foreign currency transactions and translations (1,733 ) (3,647 ) 5,087 Loans Interest income 26,232 25,196 33,545 Gain (loss) on foreign currency transactions and translations (527 ) 729 596 Trade and other receivables Interest income 151,035 144,543 164,653 Gain (loss) on disposal of financial assets — 2,452 — Gain (loss) on foreign currency transactions and translations 23,458 14,207 1,019 Short-term financial instruments Interest income 25,540 7,531 15,827 Gain (loss) on foreign currency transactions and translations (38,088 ) 32,218 3,513 Long-term financial instruments Interest income 10,406 12,470 14,371 Gain (loss) on foreign currency transactions and translations — 27 1 Other financial assets Interest income 228 230 637 Derivatives (applying hedge accounting) Gain (loss) on valuation of derivatives (profit or loss) (77,733 ) 211,180 149,888 Gain (loss) on valuation of derivatives (equity, before tax) 9,925 (11,734 ) (93,699 ) Gain (loss) on transaction of derivatives 36,053 31,351 54,422 Financial liabilities at fair value through profit or loss Gain (loss) on valuation of derivatives (104,607 ) 2,751 (345,313 ) Gain (loss) on transaction of derivatives (49,788 ) (15,358 ) (110,236 ) Financial liabilities carried at amortized cost Interest expense of borrowings and debt securities 1,365,801 1,316,269 2,142,220 Gain (loss) on repayment of financial liabilities (35 ) (10 ) (15 ) Interest expense of trade and other payables 88,757 213,765 204,078 Interest expense of others 540,867 384,423 472,248 Other finance income — 1,284 927 Other finance expenses — 2,504 167 Gain (loss) on foreign currency transactions and translations 772,045 (1,162,835 ) (936,269 ) Derivatives (applying hedge accounting) Gain (loss) on valuation of derivatives (profit or loss) (220,928 ) 158,167 83,594 Gain (loss) on valuation of derivatives (equity, before tax) 101,295 (28,726 ) 28,647 Gain (loss) on transaction of derivatives 42,565 13,737 75,201

Restricted Deposits (Tables)

Restricted Deposits (Tables)	12 Months Ended
	Dec. 31, 2022
Restricted Deposits [Abstract]
Summary of Restricted Deposits	Restricted deposits as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Cash and cash equivalents Escrow accounts ￦ — 2,912 Deposits for government project and others 22,286 30,586 Collateral provided for borrowings 264,813 250,346 Collateral provided for lawsuit 42 57 Deposits for transmission regional support program 5,921 8,626 Deposits for other business purposes 3,050 3,825 Short-term financial instruments Restriction on withdrawal related to ‘win-win 114,000 101,500 Collateral provided for borrowings 11,745 1,000 Non-current Decommissioning costs of nuclear power plants 531,720 386,220 Long-term financial instruments Escrow accounts 70 1,603 Guarantee deposits for banking accounts at oversea branches 333 18 Collateral provided for borrowings — 21,745 Decommissioning costs of nuclear power plants 324,609 497,609 Funds for developing small and medium enterprises 10,000 — Other non-current assets Deposits for other business purposes — 4,355 ￦ 1,288,589 1,310,402

Cash and Cash Equivalents (Tabl

Cash and Cash Equivalents (Tables)	12 Months Ended
	Dec. 31, 2022
Cash and cash equivalents [abstract]
Summary of Cash and Cash Equivalents	Cash and cash equivalents as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Cash ￦ 19,623 21,113 Other demand deposits 1,825,751 1,906,248 Short-term deposits classified as cash equivalents 407,921 1,063,290 Short-term investments classified as cash equivalents 381,943 244,129 ￦ 2,635,238 3,234,780

Trade and Other Receivables (Ta

Trade and Other Receivables (Tables)	12 Months Ended
	Dec. 31, 2022
Trade and other receivables [abstract]
Trade and Other Receivables	(1) Trade and other receivables as of December 31, 2021 and 2022 are as follows: 2021 Gross Allowance for doubtful accounts Present value discount Book In millions of won Current assets Trade receivables ￦ 7,743,735 (203,838 ) — 7,539,897 Other receivables 602,113 (18,555 ) (1,040 ) 582,518 8,345,848 (222,393 ) (1,040 ) 8,122,415 Non-current Trade receivables 185,512 (1,501 ) — 184,011 Other receivables 1,792,895 (64,155 ) (5,890 ) 1,722,850 1,978,407 (65,656 ) (5,890 ) 1,906,861 ￦ 10,324,255 (288,049 ) (6,930 ) 10,029,276 2022 Gross Allowance for doubtful accounts Present value discount Book In millions of won Current assets Trade receivables ￦ 9,700,880 (196,829 ) — 9,504,051 Other receivables 1,004,528 (44,388 ) (2,369 ) 957,771 10,705,408 (241,217 ) (2,369 ) 10,461,822 Non-current Trade receivables 197,955 (2,171 ) — 195,784 Other receivables 2,033,705 (65,065 ) (11,344 ) 1,957,296 2,231,660 (67,236 ) (11,344 ) 2,153,080 ￦ 12,937,068 (308,453 ) (13,713 ) 12,614,902
Other Receivables	(2) Other receivables as of December 31, 2021 and 2022 are as follows: 2021 Gross Allowance for doubtful accounts Present value Book In millions of won Current assets Non-trade receivables ￦ 232,172 (17,084 ) (9 ) 215,079 Accrued income 57,300 — — 57,300 Deposits 212,666 — (1,031 ) 211,635 Finance lease receivables(*1) 60,613 (178 ) — 60,435 Others 39,362 (1,293 ) — 38,069 602,113 (18,555 ) (1,040 ) 582,518 Non-current assets Non-trade receivables 123,537 (56,407 ) (281 ) 66,849 Accrued income 1,828 — — 1,828 Deposits 441,393 — (5,609 ) 435,784 Finance lease receivables(*2) 1,140,080 (590 ) — 1,139,490 Others 86,057 (7,158 ) — 78,899 1,792,895 (64,155 ) (5,890 ) 1,722,850 ￦ 2,395,008 (82,710 ) (6,930 ) 2,305,368 (*1)  Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of ￦111,915 million. (*2)  Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of ￦1,082,712 million.       2022 Gross Allowance for doubtful accounts Present value Book In millions of won Current assets Non-trade receivables ￦ 459,245 (41,293 ) (21 ) 417,931 Accrued income 109,267 — — 109,267 Deposits 289,580 — (2,348 ) 287,232 Finance lease receivables(*1) 67,583 (1,802 ) — 65,781 Others 78,853 (1,293 ) — 77,560 1,004,528 (44,388 ) (2,369 ) 957,771 Non-current assets Non-trade receivables 140,128 (52,696 ) (182 ) 87,250 Accrued income 2,004 — — 2,004 Deposits 459,861 — (11,162 ) 448,699 Finance lease receivables(*2) 1,171,807 (2,703 ) — 1,169,104 Others 259,905 (9,666 ) — 250,239 2,033,705 (65,065 ) (11,344 ) 1,957,296 ￦ 3,038,233 (109,453 ) (13,713 ) 2,915,067 (*1) Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of ￦114,347 million. (*2) Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of ￦1,024,927 million.
Aging Analysis of Trade Receivables	(4) Aging analysis of trade receivables as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Trade receivables: (not overdue) ￦ 7,603,472 9,509,775 Trade receivables: (impairment reviewed) 325,775 389,060 Less than 60 days 11,577 5,592 60 ~ 90 days 27,201 36,389 90 ~ 120 days 28,230 31,442 120 days ~ 1 year 51,945 99,655 Over 1 year 206,822 215,982 7,929,247 9,898,835 Less: allowance for doubtful accounts (205,339 ) (199,000 ) ￦ 7,723,908 9,699,835
Aging Analysis of Other Receivables	(5) Aging analysis of other receivables as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Other receivables: (not overdue) ￦ 2,251,474 2,857,253 Other receivables: (impairment reviewed) 143,534 180,980 Less than 60 days 87 92 60 ~ 90 days 4,881 13,643 90 ~ 120 days 1,248 2,982 120 days ~ 1 year 11,438 18,494 Over 1 year 125,880 145,769 2,395,008 3,038,233 Less: allowance for doubtful accounts (82,710 ) (109,453 ) Less: present value discount (6,930 ) (13,713 ) ￦ 2,305,368 2,915,067
Changes in the Allowance for Doubtful Accounts	(6) Changes in the allowance for doubtful accounts for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 Trade Other Trade Other Trade Other In millions of won Beginning balance ￦ 212,759 114,155 208,990 132,379 205,339 82,710 Bad debt expense 24,021 27,329 19,039 18,411 27,078 4,220 Write-off (20,332 ) (1,910 ) (21,809 ) (58,762 ) (26,319 ) (1,103 ) Reversal (3,373 ) (2,464 ) (1,071 ) (79 ) (3,444 ) (37 ) Others (4,085 ) (4,731 ) 190 (9,239 ) (3,654 ) 23,663 Ending balance ￦ 208,990 132,379 205,339 82,710 199,000 109,453

Financial Assets at Fair Valu_3

Financial Assets at Fair Value through Profit or Loss (Tables)	12 Months Ended
	Dec. 31, 2022
Financial assets at fair value through profit or loss [abstract]
Summary of Financial Assets at Fair Value Through Profit or Loss	(1) Financial assets at fair value through profit or loss as of December 31, 2021 and 2022 are as follows: 2021 2022 Current Non-current Current Non-current In millions of won Financial assets at fair value through profit or loss Beneficiary Certificate ￦ 629 206,160 294 121,406 Cooperative — 5,797 — 6,329 Others (*) 360,204 202,003 3,181,497 173,386 360,833 413,960 3,181,791 301,121 Financial assets designated as at fair value through profit or loss Debt with embedded derivatives — 258,071 — 226,596 ￦ 360,833 672,031 3,181,791 527,717 (*) ‘Other’ includes MMT which is composed of government bonds, RP(Repurchase Paper), CP(Commercial Paper),
Summary of Income (Loss) from Financial Assets at fair Value Through Profit or Loss	(2) Details of income (loss) from financial assets at fair value through profit or loss for the years ended December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Beneficiary Certificate ￦ 13,632 4,527 Cooperative 110 120 Debt with embedded derivatives 854 946 Others 19,848 27,068 ￦ 34,444 32,661

Financial Assets at Fair Valu_4

Financial Assets at Fair Value through Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2022
Financial assets at fair value through other comprehensive income [abstract]
Changes in Financial Assets at Fair Value through Other Comprehensive Income	(1) Changes in financial assets at fair value through other comprehensive income for the years ended December 31, 2021 and 2022 are as follows: 2021 Beginning Acquisition Disposal Valuation Others Ending In millions of won Equity securities Listed ￦ 194,669 1,500 (8,208 ) 81,112 4,753 273,826 Unlisted 163,890 8,929 (13 ) (12,335 ) 319 160,790 358,559 10,429 (8,221 ) 68,777 5,072 434,616 Debt securities Corporate bond — 500 — — (9 ) 491 358,559 10,929 (8,221 ) 68,777 5,063 435,107 Current financial assets at fair value through other comprehensive income ￦ — — — — — — Non-current 358,559 10,929 (8,221 ) 68,777 5,063 435,107 2022 Beginning Acquisition Disposal Valuation Others Ending In millions of won Equity securities Listed ￦ 273,826 — — 28,585 (2,354 ) 300,057 Unlisted 160,790 9,451 — 33,237 (1,235 ) 202,243 434,616 9,451 — 61,822 (3,589 ) 502,300 Debt securities Corporate bond 491 — — 38 — 529 435,107 9,451 — 61,860 (3,589 ) 502,829 Current financial assets at fair value through other comprehensive income ￦ — — — — — — Non-current 435,107 9,451 — 61,860 (3,589 ) 502,829
Financial Assets at Fair Value through Other Comprehensive Income	(2) Financial assets at fair value through other comprehensive income as of December 31, 2021 and 2022 are as follows: 2021 Shares Ownership Acquisition cost Book value Fair value In millions of won Listed Korea District Heating Corp. 2,264,068 19.55 % ￦ 173,201 87,733 87,733 Ssangyong Motor Co., Ltd. 38,568 0.03 % 428 — — SM Korea Line Corp. 180 0.00 % 1 — — Namkwang Engineering & Construction Co., Ltd. 121 0.00 % 15 1 1 Bumyang Construction Co., Ltd. 35 0.00 % 2 — — ELCOMTEC Co., Ltd. 32,875 0.04 % 217 42 42 PAN Ocean Co., Ltd. 1,492 0.00 % 14 8 8 STX Heavy Industries Co., Ltd. 7,419 0.03 % 107 35 35 Codes Combine Co., Ltd. 291 0.00 % 1 1 1 PT Adaro Energy Tbk. 480,000,000 1.50 % 65,028 89,747 89,747 Denison Mines Corp. 58,284,000 9.76 % 84,134 94,376 94,376 Fission Uranium Corp. 100,000 0.02 % 41 73 73 SangSangin Industry Co., Ltd. 5,831 0.01 % 38 6 6 Vitzosys Co., Ltd. 399 0.00 % 2 2 2 EMnI Co., Ltd. 628 0.00 % 25 2 2 Vissem electronics, Co., Ltd. 229 0.00 % 11 2 2 KC Industry Co., Ltd. 139 0.00 % 6 1 1 Ihsung CNI Co., Ltd. 142,860 4.81 % 1,500 1,779 1,779 Aone Alform Co., Ltd. 2,672 0.08 % 19 18 18 324,790 273,826 273,826 Unlisted Intellectual Discovery Co., Ltd. 1,000,000 6.00 % ￦ 5,000 954 954 Hwan Young Steel Co., Ltd. 10,916 0.14 % 1,092 97 97 SAMBO AUTO. Co., Ltd. 15,066 0.02 % 38 38 38 Mobo Co., Ltd. 504 0.00 % 14 14 14 Dae Kwang Semiconductor Co., Ltd. 589 0.07 % 6 6 6 Sanbon Department Store 828 0.01 % 124 3 3 Miju Steel Mfg. Co., Ltd. 1,097 0.23 % 50 50 50 Sungwon Co., Ltd. 117 0.07 % 29 29 29 IMHWA Corp. 329 0.11 % 5 5 5 DALIM Special Vehicle Co., Ltd. 58 0.08 % 10 10 10 ASA JEONJU Co., Ltd. 34,846 1.34 % 697 69 69 Moonkyung Silica Co., Ltd. 42 0.56 % — — — Sungkwang Timber Co., Ltd. 3 0.08 % 5 5 5 HJ Steel Co., Ltd. 218 0.07 % 2 2 2 KS Remicon Co., Ltd. 12 0.04 % 3 3 3 Joongang Platec Co., Ltd. 3,591 0.75 % 72 35 35 Pyungsan SI Co., Ltd. 434 0.01 % 9 9 9 Samgong Development Co., Ltd. 12 0.01 % 7 7 7 Joongang Development Co., Ltd. 540 0.12 % 8 8 8 AJS Co., Ltd. 12,906 0.23 % 32 32 32 MSE Co., Ltd. 429 0.13 % 9 9 9 Ilrim Nano Tec Co., Ltd. 1,520 0.07 % 15 15 15 Youngjin Hi-Tech 11,109 0.25 % 255 150 150 Buyoung Co., Ltd. 270 0.00 % 3 3 3 Ilsuk Co., Ltd. 152 0.17 % 10 10 10 Zyle Daewoo Motor Sales Co., Ltd. 22 0.00 % — — — Daewoo Development Co., Ltd. 8 0.00 % — — — Seyang Inc. 537 0.05 % 27 27 27 2021 Shares Ownership Acquisition cost Book value Fair value In millions of won Seungri Enterprise Co., Ltd. 93 0.05 % ￦ 3 3 3 Shin-E 1,569 0.64 % 111 2 2 Ejung Ad Co., Ltd. 132 0.09 % 3 3 3 Solvus Co., Ltd. 1,056 0.04 % 3 3 3 Myung Co., Ltd. 89 0.05 % 2 2 2 Biwang Industry Co., Ltd 406 0.04 % 2 2 2 Young Sung Co., Ltd. 89 0.40 % 26 26 26 Yuil Industrial Electronics Co., Ltd. 804 0.32 % 15 15 15 Woojin Industry Corporation 3 0.00 % 16 16 16 Kwang Sung Industry Co., Ltd. 325 0.35 % 7 7 7 Futech Mold Co., Ltd. 274 0.27 % 14 14 14 Woojoo Environment Ind. Co., Ltd. 101 0.11 % 13 13 13 Hyungji Esquire Co., Ltd. 61 0.02 % 22 22 22 Morado Co., Ltd. 209 0.04 % 2 2 2 Myung Sung Tex Co., Ltd. 20 0.00 % 2 2 2 Kwang Sung Co., Ltd. 610 0.53 % 31 31 31 Seen Business and Technology co., Ltd. 29,424 0.73 % 148 7 7 Woobang Construction Co., Ltd. 8 0.00 % 8 8 8 Shin Pyung Co., Ltd. 6 0.03 % 3 3 3 JMC Heavy Industries Co., Ltd. 2,724 0.10 % 27 2 2 Najin Steel Co., Ltd. 37 0.06 % 5 5 5 Sinkwang Industry Co., Ltd. 1,091 1.68 % 5 5 5 Elephant & Friends Co., Ltd. 563 0.61 % 3 3 3 Mireco Co., Ltd. 109 0.25 % 11 11 11 L&K Industry Co., Ltd. 1,615 0.60 % 24 24 24 JO Tech Co., Ltd. 1,263 0.62 % 25 25 25 Kendae Printing Co., Ltd. 422 0.60 % 21 21 21 Dauning Co., Ltd. 231 0.41 % 6 6 6 Korea Trecision Co., Ltd. 22 0.45 % 5 5 5 Ace Track Co., Ltd. 3,130 1.08 % 219 59 59 Dung Hwan Co., Ltd. 556 0.02 % 6 6 6 Hurim Biocell Co., Ltd. 1,021 0.00 % 5 5 5 Smart Power Co., Ltd. 133,333 4.14 % 200 200 200 Sunjin Power Tech Co., Ltd. 4,941 0.92 % 247 32 32 Beer Yeast Korea Inc. 1,388 0.43 % 7 7 7 B CON Co., Ltd. 96 1.16 % 6 6 6 Ace Integration Co., Ltd 105 0.09 % 24 24 24 AceInti Agricultural Co., Ltd. 16 0.02 % 5 5 5 KyungDong Co., Ltd. 130 0.01 % 1 1 1 ChunWon Development Co., Ltd. 193 0.19 % 39 39 39 SungLim Industrial Co., Ltd. 29 0.03 % 1 1 1 Korea Minerals Co., Ltd. 191 0.05 % 134 1 1 HyoDong Development Co., Ltd. 128 0.16 % 25 1 1 Haspe Tech Co., Ltd. 652 0.55 % 20 20 20 JoHyun Co., Ltd. 350 1.56 % 18 18 18 KC Co., Ltd. 5,107 0.17 % 26 26 26 SeongJi Industrial Co.,Ltd. 41 0.05 % 1 1 1 Seyang Precision Ind.Co., Ltd. 829 0.23 % 41 41 41 Dooriwon Food System Co., Ltd. 13 0.27 % 1 1 1 ShinShin Co., Ltd 339 1.12 % 17 17 17 2021 Shares Ownership Acquisition cost Book value Fair value In millions of won Sung Kwang Co., Ltd. 23 0.37 % ￦ 6 6 6 Shinheung petrol. Co., Ltd. 699 0.14 % 35 35 35 Force TEC Co., Ltd. 3,501 0.02 % 18 18 18 Samsung Tech Co., Ltd. 486 1.28 % 97 36 36 Younil Metal Co., Ltd. 41 0.21 % 21 21 21 CJ Paradise Co.,Ltd 24 0.02 % 12 12 12 Han Young Technology Company Co.,Ltd. 35 0.00 % — — — K Shipbuilding Co., Ltd. (formerly, STX Offshore & Shipbuilding Co., Ltd.) 8,622 0.25 % 1,078 1,078 1,078 Ptotronics Co., Ltd. 843 0.42 % 84 6 6 NFT Co., Ltd. 136 0.40 % 8 8 8 Hyundaitech Co.,Ltd. 1,363 0.87 % 27 27 27 Dasan Material Co., Ltd. 29 0.04 % 22 22 22 Fish World Co.,Ltd. 47 0.21 % 2 2 2 SG Shinsung Engineering and Construction Co., Ltd. 10 0.00 % 6 — — Samdo Industry Electric Co.,Ltd. 48 0.02 % 1 1 1 Taejung Industries Co.,Ltd. 9,268 0.30 % 5 5 5 Shinsei Trading Co., Ltd. 64 0.72 % 6 6 6 Dynamic Co., Ltd. 111 0.19 % 3 3 3 Green Alchemy Co.,Ltd. 38,202 1.48 % 191 17 17 Youone TBM Engineering & Construction Co., Ltd. 615 0.27 % 31 31 31 KM Leatech Co., Ltd. 1,648 0.98 % 8 8 8 Semist Co.,Ltd. 555 0.80 % 3 3 3 Sewon Bus Co.,Ltd 12 0.00 % — — — Enertec Co., Ltd. 7,937 0.19 % 44 44 44 Sangji Co., Ltd. 20 0.26 % 4 4 4 Bellie Doughnuts Co., Ltd. 169 0.19 % 10 10 10 AIRTECH Information communication Co., Ltd 2,379 0.60 % 12 12 12 Kiscom Co., Ltd. 1,493 0.04 % 1 1 1 Wonil laser Co., Ltd 157 0.37 % 16 16 16 Pyung Hwa Industrial Co.,Ltd. 3,388 3.00 % 85 85 85 Set Holding (*2) 1,100,220 2.50 % 229,255 131,036 131,036 PT. Cirebon Energi Prasarana 22,420 10.00 % 2,612 2,658 2,658 Choheung packing Co.,Ltd. 61 0.13 % 12 12 12 Jaewoo Co., Ltd. 359 0.24 % 11 11 11 Wooyang HC Co., Ltd 1,375 0.01 % 159 13 13 TheYeonriji Co., Ltd. 116 0.10 % 6 6 6 Flusys Co., Ltd. 9 0.08 % 2 2 2 DongSeo Electronics Co., Ltd. 347 0.07 % 16 17 17 Daewoo Display Co., Ltd. 177 0.03 % 5 5 5 NTS Co., Ltd. 143 0.22 % 36 36 36 AID CO., Ltd. 1,212 0.57 % 36 36 36 Changwon Eco-friendly 3 0.01 % — — — Kumo Hitech Co., Ltd. 6,697 0.53 % 100 32 32 Kyung Pyo Industry Co., Ltd. 186 0.76 % 19 19 19 Daedong Industry Co., Ltd. 617 0.55 % 46 46 46 Doosung Heavy Industries Co., Ltd. 53 0.06 % 5 5 5 Samjoo Hightech Co., Ltd. 522 0.08 % 3 3 3 Samkwang Chemical Co., Ltd. 204 1.27 % 51 51 51 SG Corp. 213 0.54 % 21 21 21 2021 Shares Ownership Acquisition cost Book value Fair value In millions of won Shinseung Chemical Industy Co., Ltd. 5 0.01 % ￦ 60 60 60 KJ Alloy Co., Ltd. 368 0.20 % 7 7 7 SM Hi-tech 22 0.39 % 22 22 22 Puruen Environment Co., Ltd. 967 1.34 % 19 19 19 Miretech Co., Ltd. 9,111 0.27 % 18 18 18 Sejin Hightech Co., Ltd. 17,980 0.16 % 18 18 18 Eun Sung Enterprise Co., Ltd. 1,131 0.72 % 17 17 17 Dongdo Basalt Industry Co., Ltd. 182 1.50 % 73 73 73 Shinyoung Textiles Co., Ltd. 523 1.01 % 52 23 23 Ilwoo Steel Co., Ltd. 41 0.28 % 17 17 17 Dong-un 1,159 6.28 % 81 81 81 Wongwang Door Corp. 575 1.00 % 29 29 29 Mansu Co.,Ltd. 344 0.25 % 15 15 15 Eanskorea Co., Ltd. 39 0.05 % 2 2 2 Youngdongseafood Co., Ltd. 165 0.33 % 8 8 8 Hyunwoo Winstar Co., Ltd. 1 0.00 % — — — Sehwa Diecasting Co., Ltd. 299 1.66 % 44 44 44 Sungchang Tech Co., Ltd. 159 0.31 % 10 10 10 Yuchang Industry Co., Ltd. 90 0.11 % 5 5 5 Jeongpum Co., Ltd. 322 0.35 % 16 16 16 Korea Steel Power Co., Ltd. 2,761 1.88 % 55 55 55 Amanex Co., Ltd. 10 0.02 % 9 9 9 Dae-A Leisure Co., Ltd. 23 0.00 % 4 4 4 Caffe Bene Co.,Ltd. 1,908 0.03 % 9 9 9 Shinjin International Corp. 4 0.01 % 1 1 1 Jinhung Packaging Co.,Ltd 4,329 3.02 % 22 22 22 Donglim Eng Co., Ltd. 26 0.11 % 3 3 3 SIP Co., Ltd. 274 0.55 % 7 7 7 Clizen Co., Ltd. 615 0.34 % 31 31 31 DAEDONGMILLENNIUM Co., Ltd. 159 0.42 % 32 32 32 Daeji Product Co., Ltd. 15 0.05 % 1 — — Jaein Circuit Co., Ltd. 498 1.12 % 65 65 65 SSET Co., Ltd. 181 0.30 % 18 18 18 Sewon PM Tech Co., Ltd. 963 1.11 % 48 48 48 Dawon Yuhwa Co., Ltd. 506 1.94 % 25 25 25 Ogokbaekkwa Co., Ltd. 101 0.12 % 1 1 1 Shinwoo Toptech Co., Ltd. 834 0.51 % 83 6 6 KMLC Co., Ltd. 281 0.14 % 22 22 22 Seinfood Co., Ltd. 13 0.17 % 7 7 7 TaeSung Eco-Tech. Co., Ltd. 1,368 4.55 % 34 34 34 Kukex Inc. 639 0.05 % 3 3 3 Youngshin Plus Co., Ltd. 104 0.12 % 5 5 5 Chang won Engineering Co., Ltd. 22 0.00 % 4 4 4 Samsung Silup Co., Ltd. 47 0.19 % 5 5 5 Samwon Bio Tech Co., Ltd. 390 0.25 % 6 6 6 IZU KOREA Co., Ltd. 48 0.00 % 2 2 2 Dongdo CNP Co., Ltd. 234 0.36 % 6 6 6 Dae Bang Industry Co.,Ltd. 115 0.13 % 6 6 6 S.I.T. Co.,Ltd 2,213 0.44 % 22 22 22 Taejin Hiech Co., Ltd. 78 0.26 % 3 3 3 2021 Shares Ownership Acquisition cost Book value Fair value In millions of won Headone Co.,Ltd. 69 0.12 % ￦ 7 7 7 E-Won Solutech Co., Ltd. 158 0.16 % 40 40 40 MJT Co., Ltd. 1,013 0.20 % 51 51 51 KPL Circuit Co., Ltd. 283 0.08 % 14 14 14 Road Solar Co., Ltd. 12 0.00 % — — — Han Mi Flexible Co.,Ltd. 143 0.20 % 43 43 43 Samhwa Casting Co., Ltd. 200 0.04 % 100 100 100 Millennium PNT Co., Ltd. 227 0.37 % 6 6 6 GN Chem Co., Ltd. 40 0.07 % 1 1 1 GW Industry Co., Ltd. 505 0.07 % 51 51 51 TM Construction Co., Ltd. 4 0.00 % — — — Dae Myung Co., Ltd. 114 0.08 % 3 3 3 Nanomicart Co., Ltd. 176 1.06 % 35 35 35 Young San Heavy Industries Co., Ltd. 74 0.11 % 7 7 7 Samchungwon Co., Ltd. 15 0.24 % 2 2 2 Wooyang Frozen Foods Co., Ltd. 66 0.82 % 27 27 27 Nanomic Co., Ltd. 94 0.63 % 38 38 38 Samsung Nonferrous Metal Co., Ltd. 89 0.26 % 9 9 9 Daewha Fuel Pump Ind., Ltd. 83 0.05 % 10 10 10 Addies Direct Co., Ltd. 1 0.00 % — — — WorldCnM Inc. 131 1.09 % 10 10 10 Superone Co., Ltd. 1,585 1.45 % 8 8 8 Buyoung Panji Co., Ltd. 478 0.44 % 12 12 12 International Paint Korea Co., Ltd. 111 0.48 % 11 11 11 EI Lighting Co., Ltd. 358 0.36 % 18 18 18 Hightech Mnp Co., Ltd. 123 0.35 % 6 6 6 Yooseung Co., Ltd. 10 0.08 % 1 1 1 Sungkwang Co., Ltd. 48 0.35 % 2 2 2 Taeyang gasteel Co., Ltd. 8 0.02 % 1 1 1 Ajin KSB Co., Ltd. 204 0.31 % 18 18 18 Sewon Ceramic Co., Ltd. 530 1.01 % 5 5 5 Choyang Tech Co., Ltd. 465 1.01 % 23 23 23 TK Co., Ltd. 307 0.70 % 15 15 15 Arari Co., Ltd. 14 0.05 % 1 1 1 Potech Co., Ltd. 39 0.13 % 14 14 14 C&S Corporation Co., Ltd. 1,304 0.01 % 13 13 13 Global The One of Korea Co., Ltd. 62 0.06 % 3 3 3 Steellife Co., Ltd. 85 0.06 % 4 4 4 D&C Castech Co., Ltd. 330 1.89 % 25 25 25 Geumhan Co., Ltd. 498 0.24 % 7 7 7 Mokgan Co., Ltd. 5 0.02 % 1 1 1 Wenex Co., Ltd. 373 0.53 % 19 19 19 Sulim Co., Ltd. 30 0.20 % 6 6 6 Shinkwang Engineering 24 0.36 % 2 2 2 Ek Cookware Co., Ltd. 60 0.04 % 1 1 1 KTTW Co., Ltd. 28 0.05 % 2 2 2 Avajar Co., Ltd. 1,061 0.01 % 1 1 1 Woosung I.B. Co.,Ltd 7,071 0.07 % 14 14 14 CAP Korea Co., Ltd. 16 0.30 % 3 3 3 MSM Co., Ltd. 25 0.08 % — — — 2021 Shares Ownership Acquisition cost Book value Fair value In millions of won Ddpopstyle Co., Ltd. 22 0.14 % ￦ — — — Finemetal Co., Ltd. 49 0.08 % 1 1 1 Sungkyeong Co., Ltd. 52 0.24 % 2 2 2 RMK Co., Ltd. 63 0.90 % 22 22 22 Tpp Co., Ltd. 36,645 11.72 % 1,832 1,832 1,832 Dukeong Metal Heat Treatment Co., Ltd. 843 3.61 % 84 84 84 Newko Co., Ltd. 331 0.06 % 10 10 10 KMC&R Co., Ltd. 16 0.11 % 1 1 1 Dongsung Mulsan Co., Ltd. 137 0.34 % 14 14 14 Pizzakorea Co., Ltd. 42 0.18 % 9 9 9 Geumdani Co., Ltd. 2,377 1.82 % 36 36 36 Mezzanine I-pack 38 0.02 % 1 1 1 Ltop Co., Ltd. 36 0.06 % 7 7 7 Simile Aluminium Co., Ltd. 428 0.31 % 9 9 9 GT Tooling Co., Ltd. 604 0.17 % 6 6 6 Team Korea Co., Ltd. 4,782 0.37 % 24 24 24 Donghwa TCA Co., Ltd. 1,012 0.30 % 25 25 25 Hankook Piaget Co., Ltd. 4 0.01 % 1 1 1 Coco Food Co., Ltd. 648 1.24 % 33 33 33 Woori Industry Co., Ltd. 102 1.05 % 21 21 21 Ssangyong Youngweol Plant Service&Engineering Co., Ltd. 83 0.07 % 4 1 1 SH Co., Ltd. 39 0.20 % 8 8 8 Namsunnam Co., Ltd. 1,275 0.19 % 6 1 1 Daeyoung Co., Ltd. 75 0.01 % 8 8 8 Chandown Food Co., Ltd. 46 0.14 % 9 9 9 Getron Co., Ltd. 7,259 0.20 % 37 4 4 Jungmun Co., Ltd. 19 0.26 % 2 2 2 Andong Trading Corporation Co., Ltd. 42 0.00 % 2 2 2 JM Tech Co., Ltd. 403 0.67 % 82 10 10 SGC Energy Co., Ltd. 580,000 5.00 % 2,900 2,900 2,900 Le Soleil KHNP LLC 137,600 19.00 % 1,376 1,376 1,376 Ihsung CNI Co., Ltd. 127,660 4.30 % 1,500 2,618 2,618 H Robotics Co., Ltd. 903,601 8.05 % 4,000 5,639 5,639 Good Tcells Co., Ltd. 11,364 0.34 % 500 457 457 IPS Bio Co., Ltd. 1,975 3.13 % 1,000 1,000 1,000 Nine B Co., Ltd. 5,000 4.96 % 1,000 1,000 1,000 Choigang-gujo Co., Ltd. 61 0.45 % 6 1 1 DS Cotec Co., Ltd. 973 0.71 % 15 5 5 Youngheung Industry Co., Ltd. 101 0.05 % 5 1 1 Hosungsteel Co., Ltd. 323 0.26 % 14 3 3 Uktae IND. Co., Ltd. 140 0.12 % 7 1 1 Gangdong R&S Co., Ltd. 69 1.25 % 1 1 1 JFC Co., Ltd. 16 0.01 % 2 2 2 Seokjin E&T Co., Ltd. 81 0.06 % 8 8 8 Hyundai Tech Co., Ltd. 28 0.69 % 10 10 10 Daeil Co., Ltd. 301 0.42 % 15 2 2 Seohan Food Co., Ltd. 83 0.19 % 2 2 2 Daehyeon Recycle Co., Ltd. 59 0.61 % 12 12 12 Metal Link Inc. Co., Ltd. 709 0.17 % 35 4 4 Pipetec Korea Co., Ltd. 50 0.07 % 10 1 1 2021 Shares Ownership Acquisition cost Book value Fair value In millions of won SungJin Tech Co., Ltd. 803 1.20 % ￦ 24 8 8 Yujin E&C Co., Ltd. 29 0.18 % 6 — — Daishin Logistics Co., Ltd. 13 0.09 % 1 1 1 JinSung Engineering Co., Ltd. 18 0.30 % 18 18 18 Yongho Industry Co., Ltd. 157 0.22 % 32 1 1 Wow tech Co., Ltd. 369 0.75 % 11 11 11 World Power Tech Co., Ltd. 16 0.28 % 24 24 24 PBM Auto Co., Ltd. 1,001 1.06 % 10 10 10 K2 Motors Co., Ltd. 54 0.28 % 1 1 1 CL Tech Co., Ltd. 801 2.25 % 40 40 40 Mirae Industry Co., Ltd. 39 0.04 % 6 6 6 Gentak Korea Co., Ltd. 301 0.31 % 8 8 8 Sungjin Chemical Co., Ltd. 118 0.36 % 4 4 4 LMAT Co., Ltd. 198 0.04 % 20 20 20 Poong Lim Industrial Co., Ltd. 25 0.00 % 38 38 38 Dae Sung GeoTech Co., Ltd. 631 1.28 % 32 32 32 Saeheemang Co., Ltd. 756 0.60 % 15 15 15 Hakbong Precision Co., Ltd. 1,460 1.18 % 15 15 15 Vornech Co., Ltd. 431 0.37 % 11 2 2 Woojin Formtech Co., Ltd. 76 0.08 % 8 1 1 Korea Engineer Manufacturing Co., Ltd. 114 0.26 % 6 1 1 Sinwa J&K Co., Ltd. 476 0.28 % 5 5 5 Owon E&G Co., Ltd. 132 0.20 % 4 4 4 Guseong Co., Ltd. 141 0.20 % 4 4 4 Irefarm Co., Ltd. 45 0.30 % 3 3 3 Nam-hae 117 0.10 % 2 2 2 Haenarae Agricultural Corp. 15 0.03 % 2 2 2 Ja Yeon Science Ind. Co., Ltd. 10 0.05 % 2 2 2 DECO&E Co., Ltd. 1,261 0.00 % 2 2 2 Design Beyond Co., Ltd. 17 0.19 % 2 2 2 LBK Co., Ltd. 8 0.05 % 1 1 1 Duckwon industrial Co., Ltd. 32 0.43 % 13 13 13 ASPT Co., Ltd. 64 0.82 % 19 19 19 SIMA Co., Ltd. 29 0.05 % 3 3 3 Jingkang Resources Co., Ltd. 90 1.57 % 13 13 13 Eslin Co., Ltd. 39 0.14 % 8 8 8 Shinwon Co., Ltd. 275 0.42 % 19 19 19 CIC Tech Co., Ltd. 96 0.54 % 10 10 10 Orano Expansion 5,742,405 4.72 % — — — Fourever Co., Ltd. 44 0.10 % 4 4 4 Segyo Hitech Co., Ltd. 156 0.24 % 8 8 8 Myungil Metal Co., Ltd. 80 0.10 % 4 4 4 Daeshin ECM Co., Ltd. 182 0.30 % 9 9 9 Greencarbon Co., Ltd. 79 0.06 % 1 1 1 Sunkoo Co., Ltd. 4 0.10 % 2 2 2 Jians Construction Co., Ltd. 13 0.00 % 2 2 2 DH trading Co., Ltd. 891 0.04 % 178 178 178 Diotech Co., Ltd. 2,186 2.84 % 219 219 219 Sangsin Co., Ltd. 29 0.09 % 15 15 15 Steel focus Co., Ltd. 154 0.20 % 4 4 4 2021 Shares Ownership Acquisition cost Book value Fair value In millions of won Kamada Korea Co., Ltd. 437 0.33 % ￦ 22 22 22 Fosys Co., Ltd. 19 0.08 % 4 4 4 GB precision Co., Ltd. 137 0.57 % 1 1 1 Ewon Art Co., Ltd. 185 0.61 % 9 9 9 DI Tech Co., Ltd. 3 0.00 % — — — Hans AD Co., Ltd. 33 0.35 % 2 2 2 Chaegim Environment Development Co., Ltd. 158 0.01 % 3 3 3 Daesung Stain Co., Ltd. 32 0.32 % 2 2 2 YSM Co., Ltd. 281 2.07 % 14 14 14 Dong In Industry Co., Ltd. 65 0.13 % 3 3 3 U&I Co., Ltd. 50 0.22 % 5 5 5 World One Co., Ltd. 401 0.58 % 10 10 10 Yewon Co., Ltd. 24 0.02 % 1 — — Seeun P&P Co., Ltd. 163 0.48 % 33 33 33 TSNT Co., Ltd. 119 0.00 % 24 24 24 Shinsung Tech Co., Ltd. 314 0.01 % 16 16 16 JSL Co., Ltd. 51 0.49 % 3 3 3 Loft Garden Co., Ltd. 1 0.04 % — — — Handon Co., Ltd. 74 0.25 % 11 11 11 GH Tech Co., Ltd. 82 0.22 % 3 3 3 Daeo Co., Ltd. 13 0.23 % 4 4 4 Bokwang Co., Ltd. 76 0.00 % 15 15 15 Samkum Industry Co., Ltd. 201 0.48 % 40 40 40 Dyntex Korea Co., Ltd. 75 0.28 % 15 15 15 IGSP Co., Ltd. 17,662 0.21 % 18 18 18 Mirae Engineering Co., Ltd. 66 0.15 % 1 1 1 Mideumeul-juneun-namu Co., Ltd. 119 0.53 % 6 6 6 Leagis Co., Ltd. 829 1.38 % 66 66 66 Seil Textile Co., Ltd. 16 0.15 % 3 3 3 Ilshin Tech Co., Ltd. 36 0.00 % 7 7 7 Magtec Co., Ltd. 28 0.00 % 6 6 6 Sukwon Co., Ltd. 2,885 0.59 % 29 29 29 Hae-sung 159 0.17 % 3 3 3 White&Clean Foods Co., Ltd. 330 0.00 % 3 3 3 Michang Cable Co., Ltd. 861 0.13 % 4 4 4 G.M Foods Co., Ltd. 57 0.16 % 9 9 9 Wecan Global Inc. Co., Ltd. 165 0.08 % 8 8 8 Daeju Steel Co., Ltd. 11 0.20 % 1 1 1 Hyundai Glass Co., Ltd. 860 0.83 % 43 43 43 MEC Co., Ltd. 16,468 1.17 % 41 41 41 Daeyeoneco Co., Ltd. 151 0.00 % 15 15 15 Hyesung Cable&Communication Inc. 762 0.39 % 38 38 38 Sangjin Co., Ltd. 428 0.35 % 21 21 21 Topis Co., Ltd. 246 0.71 % 14 14 14 G&L Tech Co., Ltd. 2 0.06 % — — — Cheonhae Co., Ltd. 72 0.00 % 2 2 2 Iksan-guwon Co., Ltd. 563 0.00 % 11 11 11 Korea Remicon Co., Ltd. 36 0.03 % 5 5 5 New Tech Co., Ltd. 23 0.15 % 2 2 2 Segeon Co., Ltd. 124 0.00 % 4 4 4 2021 Shares Ownership Acquisition cost Book value Fair value In millions of won MS Tech Co., Ltd. 9 0.15 % ￦ 1 1 1 J.I Steel Co., Ltd. 21 0.00 % 2 2 2 HNT Co., Ltd. 172 0.00 % 9 9 9 Taejin Co., Ltd. 27 0.08 % 3 3 3 Macroad Co., Ltd. 953 0.17 % 10 10 10 Jinsung Electronics Co., Ltd. 69 1.41 % 14 14 14 Woongjin Energy Co., Ltd. 94 0.00 % 9 9 9 Electric Contractors’ Financial Cooperative Co., Ltd. — — 38 38 38 Information&Communication Financial Cooperative Co., Ltd. — — 15 15 15 Common Computer Co., Ltd. 3,856 1.87 % 1,000 1,000 1,000 Fine Powerex Co., Ltd. 72,633 4.92 % 1,500 1,500 1,500 263,904 160,790 160,790 Debt securities Aron Flying Ship Co., Ltd. (*1) — — 500 491 491 ￦ 589,194 435,107 435,107 (*1) The Company used initial cost as their fair value because there was not enough information to determine fair value, and the range of the estimated fair value is wide. (*2) The Company has estimated the fair value of Set Holding by using the discounted cash flow method and has recognized the difference between its fair value and book value as gain or loss on valuation of financial assets at FVOCI in other comprehensive income or loss during the year ended December 31, 2021. 2022 Shares Ownership Acquisition cost Book value Fair value In millions of won Listed Korea District Heating Corp. 2,264,068 19.55 % ￦ 173,201 64,526 64,526 Ssangyong Motor Co., Ltd. 12,205 0.03 % 428 107 107 SM Korea Line Corp. 180 0.00 % 1 — — Namkwang Engineering & Construction Co., Ltd. 121 0.00 % 15 0 0 Bumyang Construction Co., Ltd. 35 0.00 % 2 — — ELCOMTEC Co., Ltd. 32,875 0.04 % 217 34 34 PAN Ocean Co., Ltd. 1,492 0.00 % 14 9 9 STX Heavy Industries Co., Ltd. 7,419 0.03 % 107 54 54 Codes Combine Co., Ltd. 291 0.00 % 1 1 1 PT Adaro Energy Tbk. 480,000,000 1.50 % 65,028 149,503 149,503 Denison Mines Corp. 58,284,000 7.09 % 84,134 84,502 84,502 Fission Uranium Corp. 100,000 1.73 % 41 75 75 SangSangin Industry Co., Ltd. 5,831 0.01 % 38 3 3 Vitzosys Co., Ltd. 399 0.00 % 2 — — EMnI Co., Ltd. 628 0.00 % 25 3 3 Vissem electronics, Co., Ltd. 229 0.00 % 11 1 1 KC Industry Co., Ltd. 139 0.00 % 6 — — Ihsung CNI Co., Ltd. 142,860 4.81 % 1,500 1,229 1,229 Aone Alform Co., Ltd. 2,672 0.04 % 19 10 10 324,790 300,057 300,057 Unlisted Intellectual Discovery Co., Ltd. 200,000 6.00 % ￦ 5,000 954 954 Hwan Young Steel Co., Ltd. 10,916 0.14 % 1,092 97 97 SAMBO AUTO. Co., Ltd. 15,066 0.02 % 38 38 38 Mobo Co., Ltd. 504 0.00 % 14 14 14 Dae Kwang Semiconductor Co., Ltd. 589 0.07 % 6 6 6 Sanbon Department Store 828 0.01 % 124 3 3 Miju Steel Mfg. Co., Ltd. 1,097 0.23 % 50 50 50 Sungwon Co., Ltd. 117 0.07 % 29 29 29 IMHWA Corp. 329 0.11 % 5 5 5 DALIM Special Vehicle Co., Ltd. 58 0.08 % 10 10 10 Altron Jeonju Co., Ltd. 34,846 1.34 % 697 5 5 Moonkyung Silica Co., Ltd. 42 0.56 % — — — Sungkwang Timber Co., Ltd. 3 0.08 % 5 5 5 KS Remicon Co., Ltd. 12 0.04 % 3 3 3 Joongang Platec Co., Ltd. 3,591 0.75 % 72 35 35 Pyungsan SI Co., Ltd. 434 0.01 % 4 4 4 Samgong Development Co., Ltd. 12 0.01 % 7 7 7 Joongang Development Co., Ltd. 540 0.12 % 8 8 8 AJS Co., Ltd. 12,906 0.23 % 32 32 32 MSE Co., Ltd. 429 0.13 % 9 9 9 Ilrim Nano Tec Co., Ltd. 1,520 0.07 % 15 15 15 Ilsuk Co., Ltd. 152 0.17 % 10 10 10 Zyle Daewoo Motor Sales Co., Ltd. 22 0.00 % — — — Daewoo Development Co., Ltd. 8 0.00 % — — — Seyang Inc. 537 0.05 % 27 30 30 Seungri Enterprise Co., Ltd. 93 0.05 % 3 3 3 Shin-E 1,569 0.64 % 110 2 2 Ejung Ad Co., Ltd. 132 0.09 % 3 3 3 Solvus Co., Ltd. 1,056 0.04 % 3 3 3 Myung Co., Ltd. 89 0.05 % 2 2 2 2022 Shares Ownership Acquisition cost Book value Fair value In millions of won Biwang Industry Co., Ltd 406 0.04 % ￦ 2 2 2 Young Sung Co., Ltd. 89 0.40 % 26 26 26 Yuil Industrial Electronics Co., Ltd. 804 0.32 % 15 15 15 Woojin Industry Corporation 3 0.00 % 16 16 16 Kwang Sung Industry Co., Ltd. 325 0.35 % 7 7 7 Futech Mold Co., Ltd. 274 0.27 % 14 14 14 Woojoo Environment Ind. Co., Ltd. 101 0.11 % 13 13 13 Hyungji Esquire Co., Ltd. 61 0.02 % 22 22 22 Morado Co., Ltd. 209 0.04 % 2 2 2 Myung Sung Tex Co., Ltd. 20 0.00 % 2 2 2 Kwang Sung Co., Ltd. 610 0.53 % 31 31 31 Seen Business and Technology co., Ltd. 29,424 0.73 % 148 7 7 Woobang Construction Co., Ltd. 8 0.00 % 8 8 8 Shin Pyung Co., Ltd. 6 0.03 % 3 3 3 JMC Heavy Industries Co., Ltd. 2,724 0.10 % 27 2 2 Najin Steel Co., Ltd. 37 0.06 % 5 5 5 Sinkwang Industry Co., Ltd. 1,091 1.68 % 5 5 5 Elephant & Friends Co., Ltd. 563 0.61 % 3 3 3 Mireco Co., Ltd. 109 0.25 % 11 11 11 L&K Industry Co., Ltd. 1,615 0.60 % 24 24 24 JO Tech Co., Ltd. 1,263 0.62 % 25 25 25 Kendae Printing Co., Ltd. 422 0.60 % 21 21 21 Dauning Co., Ltd. 231 0.41 % 6 6 6 Korea Trecision Co., Ltd. 22 0.45 % 5 5 5 Hurim Biocell Co., Ltd. 1,021 0.00 % 5 5 5 Smart Power Co., Ltd. 133,333 4.14 % 200 200 200 Sunjin Power Tech Co., Ltd. 4,941 0.92 % 247 32 32 Beer Yeast Korea Inc. 1,388 0.43 % 7 7 7 B CON Co., Ltd. 96 1.16 % 6 6 6 Ace Integration Co., Ltd. 105 0.09 % 24 24 24 AceInti Agricultural Co., Ltd. 16 0.02 % 5 5 5 KyungDong Co., Ltd. 130 0.01 % 1 1 1 ChunWon Development Co., Ltd. 193 0.19 % 39 39 39 SungLim Industrial Co., Ltd. 29 0.03 % 1 1 1 Korea Minerals Co., Ltd. 191 0.05 % 134 1 1 HyoDong Development Co., Ltd. 128 0.16 % 25 1 1 JoHyun Co., Ltd. 350 1.56 % 18 18 18 KC Co., Ltd. 5,107 0.17 % 26 26 26 SeongJi Industrial Co.,Ltd. 41 0.05 % 1 1 1 Seyang Precision Ind. Co., Ltd. 829 0.23 % 41 41 41 Dooriwon Food System Co., Ltd. 13 0.27 % 1 1 1 Sung Kwang Co., Ltd. 23 0.37 % 6 6 6 Shinheung petrol. Co., Ltd. 699 0.14 % 35 35 35 Force TEC Co., Ltd. 3,501 0.02 % 18 18 18 Samsung Tech Co., Ltd. 486 1.28 % 97 36 36 Younil Metal Co., Ltd. 41 0.21 % 21 21 21 CJ Paradise Co.,Ltd 24 0.02 % 12 12 12 Han Young Technology Company Co.,Ltd. 35 0.00 % — — — Ptotronics Co., Ltd. 843 0.42 % 84 6 6 NFT Co., Ltd. 136 0.40 % 8 8 8 Hyundaitech Co.,Ltd. 1,363 0.87 % 27 27 27 Dasan Material Co., Ltd. 29 0.04 % 22 22 22 Fish World Co.,Ltd. 47 0.21 % 2 2 2 2022 Shares Ownership Acquisition cost Book value Fair value In millions of won SG Shinsung Engineering and Construction Co., Ltd. 10 0.00 % ￦ 6 — — Samdo Industry Electric Co.,Ltd. 48 0.02 % 1 1 1 Taejung Industries Co.,Ltd. 9,268 0.30 % 5 5 5 Shinsei Trading Co., Ltd. 64 0.72 % 6 6 6 Dynamic Co., Ltd. 111 0.19 % 3 3 3 Green Alchemy Co.,Ltd. 38,202 1.48 % 191 17 17 Youone TBM Engineering & Construction Co., Ltd. 615 0.27 % 31 31 31 KM Leatech Co., Ltd. 1,648 0.98 % 8 8 8 Semist Co.,Ltd. 555 0.80 % 3 3 3 Sewon Bus Co.,Ltd 12 0.00 % — — — Enertec Co., Ltd. 7,937 0.19 % 44 44 44 Sangji Co., Ltd. 20 0.26 % 4 4 4 Bellie Doughnuts Co., Ltd. 169 0.19 % 10 10 10 AIRTECH Information communication Co., Ltd 2,379 0.60 % 12 12 12 Kiscom Co., Ltd. 1,493 0.04 % 1 1 1 Set Holding (*2) 1,100,220 2.50 % 229,255 163,580 163,580 Choheung packing Co.,Ltd. 61 0.13 % 12 12 12 Jaewoo Co., Ltd. 359 0.24 % 11 11 11 Wooyang HC Co., Ltd 1,375 0.01 % 159 13 13 TheYeonriji Co., Ltd. 116 0.10 % 6 6 6 Flusys Co., Ltd. 9 0.08 % 2 2 2 DongSeo Electronics Co., Ltd. 347 0.07 % 17 17 17 Daewoo Display Co., Ltd. 177 0.03 % 5 5 5 NTS Co., Ltd. 143 0.22 % 36 36 36 AID CO., Ltd. 1,212 0.57 % 36 36 36 Changwon Eco-friendly farming Corp. 3 0.01 % — — — Kumo Hitech Co., Ltd. 6,697 0.53 % 100 32 32 Kyung Pyo Industry Co., Ltd. 186 0.76 % 19 19 19 Doosung Heavy Industries Co., Ltd. 53 0.06 % 5 5 5 Samjoo Hightech Co., Ltd. 522 0.08 % 3 3 3 Samkwang Chemical Co., Ltd. 204 1.27 % 51 51 51 Shinseung Chemical Industy Co., Ltd. 5 0.01 % 60 — — KJ Alloy Co., Ltd. 368 0.20 % 7 7 7 SM Hi-tech Co., Ltd. 22 0.39 % 22 22 22 Puruen Environment Co., Ltd. 967 1.34 % 19 19 19 Miretech Co., Ltd. 9,111 0.27 % 18 18 18 Sejin Hightech Co., Ltd. 17,980 0.16 % 18 18 18 Eun Sung Enterprise Co., Ltd. 1,131 0.72 % 17 17 17 Shinyoung Textiles Co., Ltd. 523 1.01 % 52 23 23 Ilwoo Steel Co., Ltd. 41 0.28 % 17 17 17 Dong-un Tech Co., Ltd. 1,159 6.28 % 81 34 34 Wongwang Door Corp. 575 1.00 % 29 29 29 Mansu Co.,Ltd. 344 0.25 % 15 15 15 Eanskorea Co., Ltd. 39 0.05 % 2 2 2 Youngdongseafood Co., Ltd. 165 0.33 % 8 8 8 Hyunwoo Winstar Co., Ltd. 1 0.00 % — — — Sungchang Tech Co., Ltd. 159 0.31 % 19 19 19 Yuchang Industry Co., Ltd. 90 0.11 % 5 5 5 Jeongpum Co., Ltd. 322 0.35 % 16 16 16 Korea Steel Power Co., Ltd. 2,761 1.88 % 55 2 2 Amanex Co., Ltd. 10 0.02 % 9 9 9 Dae-A Leisure Co., Ltd. 23 0.00 % 4 4 4 Caffe Bene Co.,Ltd. 1,908 0.03 % 9 9 9 Shinjin International Corp. 4 0.01 % 1 1 1 2022 Shares Ownership Acquisition cost Book value Fair value In millions of won Jinhung Packaging Co.,Ltd 4,329 3.02 % ￦ 22 22 22 Donglim Eng Co., Ltd. 26 0.11 % 3 3 3 SIP Co., Ltd. 274 0.55 % 7 7 7 Clizen Co., Ltd. 615 0.34 % 31 31 31 Daeji Product Co., Ltd. 15 0.05 % 1 — — SSET Co., Ltd. 181 0.30 % 18 18 18 Sewon PM Tech Co., Ltd. 963 1.11 % 48 48 48 Dawon Yuhwa Co., Ltd. 506 1.94 % 25 25 25 Ogokbaekkwa Co., Ltd. 101 0.12 % 1 1 1 Shinwoo Toptech Co., Ltd. 834 0.51 % 83 6 6 KMLC Co., Ltd. 281 0.14 % 22 22 22 Seinfood Co., Ltd. 13 0.17 % 7 7 7 TaeSung Eco-Tech. Co., Ltd. 1,368 4.55 % 34 34 34 Kukex Inc. 639 0.05 % 3 3 3 Youngshin Plus Co., Ltd. 104 0.12 % 5 5 5 Chang won Engineering Co., Ltd. 22 0.00 % 4 4 4 Samsung Silup Co., Ltd. 47 0.19 % 5 5 5 Samwon Bio Tech Co., Ltd. 390 0.25 % 6 6 6 IZU KOREA Co., Ltd. 48 0.00 % 2 2 2 Dongdo CNP Co., Ltd. 234 0.36 % 6 6 6 Dae Bang Industry Co.,Ltd. 115 0.13 % 6 6 6 S.I.T. Co.,Ltd 2,213 0.44 % 22 22 22 Taejin Hiech Co., Ltd. 78 0.26 % 3 3 3 Headone Co.,Ltd. 69 0.12 % 7 7 7 E-Won Solutech Co., Ltd. 158 0.16 % 40 40 40 KPL Circuit Co., Ltd. 283 0.08 % 14 14 14 Road Solar Co., Ltd. 12 0.00 % — — — Han Mi Flexible Co.,Ltd. 143 0.20 % 43 43 43 Millennium PNT Co., Ltd. 227 0.37 % 6 6 6 GN Chem Co., Ltd. 40 0.07 % 1 1 1 Dae Myung Co., Ltd. 114 0.08 % 3 3 3 Nanomicart Co., Ltd. 176 1.06 % 35 35 35 Young San Heavy Industries Co., Ltd. 74 0.11 % 7 7 7 Samchungwon Co., Ltd. 15 0.24 % 2 2 2 Wooyang Frozen Foods Co., Ltd. 66 0.82 % 27 27 27 Nanomic Co., Ltd. 94 0.63 % 38 38 38 Samsung Nonferrous Metal Co., Ltd. 89 0.26 % 9 9 9 Daewha Fuel Pump Ind., Ltd. 83 0.05 % 10 10 10 Addies Direct Co., Ltd. 1 0.00 % — — — WorldCnM Inc. 131 1.09 % 10 10 10 Superone Co., Ltd. 1,585 1.45 % 8 8 8 Buyoung Panji Co., Ltd. 478 0.44 % 12 12 12 International Paint Korea Co., Ltd. 111 0.48 % 11 11 11 EI Lighting Co., Ltd. 358 0.36 % 18 18 18 Hightech Mnp Co., Ltd. 123 0.35 % 6 6 6 Yooseung Co., Ltd. 10 0.08 % 1 1 1 Sungkwang Co., Ltd. 48 0.35 % 2 2 2 Taeyang gasteel Co., Ltd. 8 0.02 % 1 1 1 Ajin KSB Co., Ltd. 204 0.31 % 18 18 18 Sewon Ceramic Co., Ltd. 530 1.01 % 5 5 5 Choyang Tech Co., Ltd. 465 1.01 % 23 23 23 TK Co., Ltd. 307 0.70 % 15 15 15 Arari Co., Ltd. 14 0.05 % 1 1 1 2022 Shares Ownership Acquisition cost Book value Fair value In millions of won C&S Corporation Co., Ltd. 1,304 0.01 % ￦ 13 13 13 Global The One of Korea Co., Ltd. 62 0.06 % 3 3 3 Steellife Co., Ltd. 85 0.06 % 4 4 4 D&C Castech Co., Ltd. 330 1.89 % 25 25 25 Geumhan Co., Ltd. 498 0.24 % 7 7 7 Mokgan Co., Ltd. 5 0.02 % 1 1 1 Wenex Co., Ltd. 373 0.53 % 19 19 19 Sulim Co., Ltd. 30 0.20 % 6 6 6 Shinkwang Engineering 24 0.36 % 2 2 2 Ek Cookware Co., Ltd. 60 0.04 % 1 1 1 KTTW Co., Ltd. 28 0.05 % 2 2 2 Avajar Co., Ltd. 1,061 0.01 % 1 1 1 Woosung I.B. Co.,Ltd 7,071 0.07 % 14 14 14 CAP Korea Co., Ltd. 16 0.30 % 3 3 3 MSM Co., Ltd. 25 0.08 % — — — Ddpopstyle Co., Ltd. 22 0.14 % 1 1 1 Finemetal Co., Ltd. 49 0.08 % 1 1 1 Sungkyeong Co., Ltd. 52 0.24 % 2 2 2 RMK Co., Ltd. 63 0.90 % 22 22 22 Newko Co., Ltd. 331 0.06 % 10 10 10 Dongsung Mulsan Co., Ltd. 137 0.34 % 14 14 14 Pizzakorea Co., Ltd. 42 0.18 % 9 9 9 Geumdani Co., Ltd. 2,377 1.82 % 36 36 36 Mezzanine I-pack 38 0.02 % 1 1 1 Ltop Co., Ltd. 36 0.06 % 7 7 7 Simile Aluminium Co., Ltd. 428 0.31 % 9 9 9 GT Tooling Co., Ltd. 604 0.17 % 6 6 6 Team Korea Co., Ltd. 4,782 0.37 % 24 24 24 Donghwa TCA Co., Ltd. 1,012 0.30 % 25 25 25 Hankook Piaget Co., Ltd. 4 0.01 % 1 1 1 Coco Food Co., Ltd. 648 1.24 % 33 33 33 Woori Industry Co., Ltd. 102 1.05 % 21 21 21 Ssangyong Youngweol Plant Service&Engineering Co., Ltd. 83 0.07 % 4 1 1 SH Co., Ltd. 39 0.20 % 8 8 8 Daeyoung Co., Ltd. 75 0.01 % 8 8 8 Chandown Food Co., Ltd. 46 0.14 % 9 9 9 Getron Co., Ltd. 7,259 0.20 % 37 4 4 Jungmun Co., Ltd. 19 0.26 % 2 2 2 Andong Trading Corporation Co., Ltd. 42 0.00 % 2 2 2 JM Tech Co., Ltd. 403 0.67 % 82 10 10 SGC Energy Co., Ltd. 580,000 5.00 % 2,900 7,856 7,856 Le Soleil KHNP LLC 137,600 19.00 % 1,376 1,376 1,376 Ihsung CNI Co., Ltd. 127,660 4.30 % 1,500 2,016 2,016 H Robotics Co., Ltd. 903,601 8.05 % 4,000 5,638 5,638 Good Tcells Co., Ltd. 11,364 0.34 % 500 347 347 IPS Bio Co., Ltd. 1,975 3.13 % 1,000 843 843 Nine B Co., Ltd. 5,000 4.96 % 1,000 1,000 1,000 2022 Shares Ownership Acquisition cost Book value Fair value In millions of won Choigang-gujo Co., Ltd. 61 0.45 % ￦ 6 1 1 Youngheung Industry Co., Ltd. 101 0.05 % 5 1 1 Hosungsteel Co., Ltd. 323 0.26 % 14 3 3 Uktae IND. Co., Ltd. 140 0.12 % 7 1 1 JFC Co., Ltd. 16 0.01 % 2 2 2 Hyundai Tech Co., Ltd. 28 0.69 % 10 10 10 Daeil Co., Ltd. 301 0.42 % 15 2 2 Seohan Food Co., Ltd. 83 0.19 % 2 2 2 Daehyeon Recycle Co., Ltd. 59 0.61 % 12 12 12 Metal Link Inc. Co., Ltd. 709 0.17 % 35 4 4 Pipetec Korea Co., Ltd. 50 0.07 % 10 1 1 SungJin Tech Co., Ltd. 803 1.20 % 24 8 8 Yujin E&C Co., Ltd. 29 0.18 % 6 — — Daishin Logistics Co., Ltd. 13 0.09 % 1 1 1 JinSung Engineering Co., Ltd. 18 0.30 % 18 18 18 Yongho Industry Co., Ltd. 157 0.22 % 32 1 1 Wow tech Co., Ltd. 369 0.75 % 11 11 11 World Power Tech Co., Ltd. 16 0.28 % 24 24 24 PBM Auto Co., Ltd. 1,001 1.06 % 10 10 10 K2 Motors Co., Ltd. 54 0.28 % 1 1 1 CL Tech Co., Ltd. 801 2.25 % 40 40 40 Mirae Industry Co., Ltd. 39 0.04 % 6 6 6 Gentak Korea Co., Ltd. 301 0.31 % 8 8 8 Sungjin Chemical Co., Ltd. 118 0.36 % 4 4 4 LMAT Co., Ltd. 198 0.04 % 20 20 20 Poong Lim Industrial Co., Ltd. 25 0.00 % 38 38 38 Dae Sung GeoTech Co., Ltd. 631 1.28 % 32 32 32 Saeheemang Co., Ltd. 756 0.60 % 15 15 15 Hakbong Precision Co., Ltd. 1,460 1.18 % 15 15 15 Vornech Co., Ltd. 431 0.37 % 11 2 2 Woojin Formtech Co., Ltd. 76 0.08 % 8 1 1 Korea Engineer Manufacturing Co., Ltd. 114 0.26 % 6 1 1 Sinwa J&K Co., Ltd. 476 0.28 % 5 5 5 Owon E&G Co., Ltd. 132 0.20 % 4 4 4 Guseong Co., Ltd. 141 0.20 % 3 3 3 Irefarm Co., Ltd. 45 0.30 % 3 3 3 Nam-hae E&C Co., Ltd. 117 0.10 % 2 2 2 Haenarae Agricultural Corp. 15 0.03 % 2 2 2 DECO&E Co., Ltd. 1,261 0.00 % 2 2 2 Design Beyond Co., Ltd. 17 0.19 % 2 2 2 LBK Co., Ltd. 8 0.05 % 1 1 1 Duckwon industrial Co., Ltd. 32 0.43 % 13 13 13 ASPT Co., Ltd. 64 0.82 % 19 19 19 SIMA Co., Ltd. 29 0.05 % 3 3 3 2022 Shares Ownership Acquisition cost Book value Fair value In millions of won Jingkang Resources Co., Ltd. 90 1.57 % ￦ 13 13 13 Eslin Co., Ltd. 39 0.14 % 8 8 8 Shinwon Co., Ltd. 275 0.42 % 19 19 19 CIC Tech Co., Ltd. 96 0.54 % 10 10 10 Orano Expansion 5,742,405 4.72 % — — — Fourever Co., Ltd. 44 0.10 % 4 4 4 Myungil Metal Co., Ltd. 80 0.10 % 4 4 4 Daeshin ECM Co., Ltd. 182 0.30 % 9 9 9 Greencarbon Co., Ltd. 79 0.06 % 1 1 1 Sunkoo Co., Ltd. 4 0.10 % 2 2 2 Jians Construction Co., Ltd. 45 0.01 % 2 4 4 DH trading Co., Ltd. 891 0.04 % 178 — — Sangsin Co., Ltd. 29 0.09 % 15 15 15 Steel focus Co., Ltd. 154 0.20 % 4 4 4 Kamada Korea Co., Ltd. 437 0.33 % 22 22 22 Fosys Co., Ltd. 19 0.08 % 4 4 4 GB precision Co., Ltd. 137 0.57 % 1 1 1 Ewon Art Co., Ltd. 185 0.61 % 9 9 9 DI Tech Co., Ltd. 3 0.00 % — — — Hans AD Co., Ltd. 33 0.35 % 2 2 2 Chaegim Environment Development Co., Ltd. 158 0.01 % 3 3 3 Daesung Stain Co., Ltd. 32 0.32 % 2 2 2 YSM Co., Ltd. 281 2.07 % 14 14 14 Dong In Industry Co., Ltd. 65 0.13 % 3 3

Financial Assets at Amortized_2

Financial Assets at Amortized Cost (Tables)	12 Months Ended
	Dec. 31, 2022
Financial Assets at Amortized Cost [Abstract]
Summary of Financial Assets at Amortized Cost	Financial assets at amortized cost as of December 31, 2021 and 2022 are as follows: 2021 Financial assets Book value In millions of won Government bonds ￦ 1,308 1,308 Others 23,965 23,965 ￦ 25,273 25,273 Current ￦ 15,422 15,422 Non-current 9,851 9,851 2022 Financial assets Book value In millions of won Government bonds ￦ 1,920 1,920 Others 25,078 25,078 ￦ 26,998 26,998 Current ￦ 16,762 16,762 Non-current 10,236 10,236

Derivatives (Tables)

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2022
Derivatives [Abstract]
Summary of Derivative	(1) Derivatives as of December 31, 2021 and 2022 are as follows: 2021 2022 Current Non-current Current Non-current In millions of won Derivative assets Currency forward ￦ 559 6,899 648 17,432 Currency swap 125,877 506,957 236,470 589,300 —Trading 92,313 335,765 102,080 410,540 —Hedging 33,564 171,192 134,390 178,760 Interest rate swap 502 6,980 52,485 81,188 —Trading 502 6,980 52,485 81,188 —Hedging — — — — Others (*3) — 9 — 40,501 ￦ 126,938 520,845 289,603 728,421 Derivative liabilities Currency forward ￦ 301 — 32,660 — Currency swap 4,446 16,708 6,319 328,995 —Trading 4,446 15,576 6,319 302,415 —Hedging — 1,132 — 26,580 Interest rate swap 2,544 28,138 — 2,735 —Trading 174 2,829 — 2,735 —Hedging 2,370 25,309 — — Others (*1,2,3) — 25,894 6,015 56,027 ￦ 7,291 70,740 44,994 387,757 (*1) The Company has an obligation to settle the convertible preferred stock to financial investors pursuant to the settlement contract with Samcheok Eco Materials Co., Ltd. and the fair value of the obligation is recorded in ‘Others’(See note 47). (*2) The Company has granted stock option to Chester Solar IV SpA, a joint venture of the Company, and 4 other third party investors, and recognized its fair value as other derivative liabilities. (*3) The Company has an obligation to purchase the shares of Hyundai Green Power Co., Ltd., an associate of the Company from financial investors, and the fair value of the obligation is recorded in ‘Others’.
Currency Forward Contracts which are not Designated as Hedge Instruments	(2) Currency forward contracts which are not designated as hedging instruments as of December 31, 2022 are as follows: Counterparty Contract date Maturity date Contract amounts Contract exchange rate (in won) Pay Receive In millions of won and thousands of foreign currencies Busan Bank 2022.12.08 2023.01.09 ￦ 9,237 USD 7,000 ￦ 1,319.50 Woori Bank 2022.12.09 2023.01.06 13,165 USD 10,000 1,316.45 Nonghyup Bank 2022.12.13 2023.01.10 10,430 USD 8,000 1,303.80 Kookmin Bank 2022.12.15 2023.01.16 12,988 USD 10,000 1,298.84 Hana Bank 2022.12.15 2023.01.17 28,632 USD 22,000 1,301.45 Standard Chartered 2022.12.16 2023.01.18 26,141 USD 20,000 1,307.05 Mizuho Bank 2022.12.16 2023.01.19 26,096 USD 20,000 1,304.80 JP Morgan 2022.12.19 2023.01.20 26,080 USD 20,000 1,304.00 Korea Development Bank 2022.12.19 2023.01.26 26,010 USD 20,000 1,300.50 Kookmin Bank 2022.12.19 2023.01.27 25,959 USD 20,000 1,297.93 Busan Bank 2022.12.21 2023.01.25 12,853 USD 10,000 1,285.25 Nonghyup Bank 2022.12.21 2023.01.26 14,134 USD 11,000 1,284.90 Hana Bank 2022.12.27 2023.01.30 18,992 USD 15,000 1,266.15 Standard Chartered 2022.12.28 2023.01.31 15,216 USD 12,000 1,268.00 Morgan Stanley 2022.12.28 2023.02.01 15,205 USD 12,000 1,267.10 Kookmin Bank 2022.12.29 2023.02.02 20,247 USD 16,000 1,265.44 Mizuho Bank 2022.12.29 2023.02.03 20,255 USD 16,000 1,265.95 Kookmin Bank 2022.12.30 2023.02.28 15,128 USD 12,000 1,260.70 Hana Bank 2022.12.06 2023.01.06 13,091 USD 10,000 1,309.05 Mizuho Bank 2022.12.15 2023.01.13 26,001 USD 20,000 1,300.07 MUFG 2022.12.19 2023.01.20 52,054 USD 40,000 1,301.35 MUFG 2022.12.20 2023.01.13 25,952 USD 20,000 1,297.60 MUFG 2022.12.29 2023.01.27 45,605 USD 36,000 1,266.80 Shinhan Bank 2022.11.03 2023.01.09 7,085 USD 5,000 1,417.00 JP Morgan 2022.11.07 2023.01.13 14,012 USD 10,000 1,401.20 JP Morgan 2022.11.25 2023.01.20 6,611 USD 5,000 1,322.10 JP Morgan 2022.12.29 2023.01.05 38,040 USD 30,000 1,268.00 Standard Chartered 2022.12.29 2023.01.05 25,358 USD 20,000 1,267.90 Mizuho Bank 2022.11.09 2023.01.06 13,681 USD 10,000 1,368.10 Nonghyup Bank 2022.12.27 2023.01.16 6,334 USD 5,000 1,266.70 Mizuho Bank 2022.11.11 2023.01.30 5,207 USD 3,842 1,355.05 Mizuho Bank 2022.11.11 2023.01.30 34,001 USD 25,000 1,360.05 Nonghyup Bank 2022.12.21 2023.02.23 3,603 USD 2,806 1,283.70 SMBC 2022.11.30 2023.01.20 USD 10,000 13,153 1,315.30 SMBC 2022.11.30 2023.02.16 USD 15,000 19,783 1,318.85 SMBC 2022.12.26 2023.03.23 USD 8,000 10,173 1,271.60 SMBC 2022.12.29 2023.03.28 USD 15,000 18,933 1,262.20 SMBC 2022.12.29 2023.06.13 USD 15,000 18,872 1,258.10 MUFG 2022.11.25 2023.02.08 13,175 USD 10,000 1,317.50 MUFG 2022.12.12 2023.02.27 33,947 USD 26,000 1,305.64 MUFG 2022.11.24 2023.01.30 13,234 USD 10,000 1,323.40 JP Morgan 2022.11.24 2023.01.30 13,830 USD 10,406 1,329.05 JP Morgan 2022.11.30 2023.01.17 13,163 USD 10,000 1,316.30 HSBC 2022.11.09 2023.01.30 42,627 USD 31,000 1,375.05 Counterparty Contract date Maturity date Contract amounts Contract exchange rate (in won) Pay Receive In millions of won and thousands of foreign currencies HSBC 2020.10.19 2024.10.29 ￦ 140,913 USD 125,000 ￦ 1,127.30 Busan Bank 2022.10.25 2023.01.13 13,039 USD 9,090 1,434.50 MUFG 2022.10.25 2023.01.13 1,433 USD 1,000 1,433.18 Woori Bank 2022.11.08 2023.02.03 12,332 USD 8,918 1,382.80 Shinhan Bank 2022.11.09 2023.03.03 13,605 USD 10,000 1,360.50 MUFG 2022.11.10 2023.03.03 20,464 USD 15,000 1,364.27 Standard Chartered 2022.11.24 2023.04.07 17,612 USD 13,214 1,332.80 Standard Chartered 2022.12.01 2023.05.12 12,932 USD 10,000 1,293.20 Standard Chartered 2022.12.05 2023.05.12 3,121 USD 2,425 1,286.90 Woori Bank 2022.12.08 2023.05.12 13,145 USD 10,000 1,314.50 HSBC 2022.12.12 2023.06.09 19,482 USD 15,000 1,298.80 Busan Bank 2022.12.12 2023.06.09 19,479 USD 15,000 1,298.60 MUFG 2022.12.15 2023.06.09 19,386 USD 15,000 1,292.41 Shinhan Bank 2022.12.15 2023.06.09 19,397 USD 15,000 1,293.10 Standard Chartered 2022.12.15 2023.06.09 19,397 USD 15,000 1,293.10 HSBC 2022.12.22 2023.06.09 12,695 USD 10,000 1,269.45 Shinhan Bank 2022.12.22 2023.06.09 12,671 USD 10,000 1,267.10
Currency Swap Contracts Which Are Not Designated As Hedge Instruments	(3) Currency swap contracts which are not designated as hedging instruments as of December 31, 2022 are as follows: Contract year Contract amount Contract interest rate Contract (in won, USD) Counterparty Pay Receive Pay Receive In millions of won and thousands of foreign currencies except contract exchange rate information Standard Chartered 2014~2029 ￦ 102,470 USD 100,000 3.14% 3.57% ￦ 1,024.70 Societe Generale 2014~2024 105,017 USD 100,000 4.92% 5.13% 1,050.17 Hana Bank 2015~2024 107,970 USD 100,000 4.75% 5.13% 1,079.70 Credit Agricole 2015~2024 94,219 USD 86,920 4.85% 5.13% 1,083.97 Woori Bank 2019~2027 21,708 USD 19,417 5.04% 6.75% 1,118.00 Woori Bank 2019~2024 296,000 USD 250,000 1.21% 2.50% 1,184.00 Korea Development Bank 2019~2024 177,600 USD 150,000 1.24% 2.50% 1,184.00 Hana Bank 2019~2024 118,400 USD 100,000 1.24% 2.50% 1,184.00 Woori Bank 2020~2025 241,320 USD 200,000 0.54% 1.13% 1,206.60 Korea Development Bank 2020~2025 241,320 USD 200,000 0.54% 1.13% 1,206.60 Kookmin Bank 2020~2025 120,660 USD 100,000 0.54% 1.13% 1,206.60 Kookmin Bank 2020~2026 76,355 USD 70,445 5.83% 6.00% 1,083.90 Woori Bank 2021~2026 118,170 USD 100,000 1.11% 1.13% 1,181.70 Korea Development Bank 2021~2026 118,170 USD 100,000 1.11% 1.13% 1,181.70 Hana Bank 2021~2026 118,170 USD 100,000 1.11% 1.13% 1,181.70 Hana Bank 2022~2025 385,800 USD 300,000 3.11% 3.63% 1,286.00 Woori Bank 2022~2025 257,200 USD 200,000 3.12% 3.63% 1,286.00 JP Morgan 2022~2027 128,600 USD 100,000 3.56% 4.00% 1,286.00 Woori Bank 2022~2027 128,600 USD 100,000 3.56% 4.00% 1,286.00 Kookmin Bank 2022~2027 128,600 USD 100,000 3.56% 4.00% 1,286.00 Korea Development Bank 2022~2026 283,820 USD 200,000 4.67% 5.38% 1,419.10 Hana Bank 2022~2026 141,910 USD 100,000 4.68% 5.38% 1,419.10 JP Morgan 2022~2026 141,910 USD 100,000 4.69% 5.38% 1,419.10 Woori Bank 2022~2026 141,910 USD 100,000 4.69% 5.38% 1,419.10 Korea Development Bank 2022~2028 283,820 USD 200,000 5.12% 5.50% 1,419.10 Woori Bank 2022~2028 141,910 USD 100,000 5.13% 5.50% 1,419.10 Nomura 2015~2025 111,190 USD 100,000 2.60% 3.25% 1,111.90 Korea Development Bank 2015~2025 111,190 USD 100,000 2.62% 3.25% 1,111.90 Woori Bank 2015~2025 55,595 USD 50,000 2.62% 3.25% 1,111.90 Hana Bank 2015~2025 55,595 USD 50,000 2.62% 3.25% 1,111.90 Woori Bank 2017~2027 111,610 USD 100,000 2.25% 3.13% 1,116.10 Korea Development Bank 2017~2027 111,610 USD 100,000 2.31% 3.13% 1,116.10 Hana Bank 2017~2027 111,610 USD 100,000 2.31% 3.13% 1,116.10 Korea Development Bank 2018~2028 108,600 HKD 800,000 2.69% 3.35% 135.75 Shinhan Bank 2018~2028 115,387 HKD 850,000 2.66% 3.35% 135.75 Korea Development Bank 2018~2023 170,280 USD 150,000 2.15% 3.75% 1,135.20 Woori Bank 2018~2023 170,280 USD 150,000 2.18% 3.75% 1,135.20 Hana Bank 2018~2023 113,520 USD 100,000 2.17% 3.75% 1,135.20 Shinhan Bank 2018~2023 227,040 USD 200,000 2.17% 3.75% 1,135.20 Korea Citi Bank 2019~2024 239,956 CHF 200,000 1.44% 0.00% 1,199.78 Korea Development Bank 2019~2027 119,978 CHF 100,000 1.43% 0.05% 1,199.78 Woori Bank 2021~2026 222,800 USD 200,000 0.93% 1.25% 1,114.00 Shinhan Bank 2021~2026 111,400 USD 100,000 0.92% 1.25% 1,114.00 Korea Development Bank 2021~2026 111,400 USD 100,000 0.93% 1.25% 1,114.00 Nonghyup Bank 2021~2026 111,400 USD 100,000 0.93% 1.25% 1,114.00 Contract year Contract amount Contract interest rate Contract (in won, USD) Counterparty Pay Receive Pay Receive In millions of won and thousands of foreign currencies except contract exchange rate information Woori Bank 2022~2027 ￦ 262,000 USD 200,000 3.62% 4.25% ￦ 1,310.00 Export-Import Bank of Korea 2022~2027 131,000 USD 100,000 3.63% 4.25% 1,310.00 Kookmin Bank 2022~2027 131,000 USD 100,000 3.62% 4.25% 1,310.00 Hana Bank 2022~2027 131,000 USD 100,000 3.61% 4.25% 1,310.00 Korea Development Bank 2022~2027 262,000 USD 200,000 3.63% 4.25% 1,310.00 Export-Import Bank of Korea 2022~2032 349,829 HKD 1,935,000 4.87% 5.16% 180.79 JP Morgan 2022~2032 75,194 HKD 415,000 5.00% 5.16% 181.19 HSBC 2019~2024 USD 205,500 AUD 300,000 3M Libor + 0.78% 3M BBSW + 0.97% USD 0.69
Currency Swap Contracts Which Are Designated As Hedge Instruments	(4) Currency swap contracts which are designated as hedging instruments as of December 31, 2022 are as follows: Counterparty Contract year Contract amount Contract interest rate Contract (in won) Pay Receive Pay Receive In millions of won and thousands of foreign currencies except contract exchange rate information Kookmin Bank 2020~2025 ￦ 118,780 USD 100,000 1.29% 2.13% ￦ 1,187.80 Shinhan Bank 2020~2025 118,780 USD 100,000 1.29% 2.13% 1,187.80 Hana Bank 2020~2025 118,780 USD 100,000 1.29% 2.13% 1,187.80 Korea Development Bank 2020~2026 118,910 USD 100,000 0.61% 1.00% 1,189.10 Hana Bank 2020~2026 118,910 USD 100,000 0.61% 1.00% 1,189.10 Woori Bank 2020~2026 118,910 USD 100,000 0.62% 1.00% 1,189.10 Nomura 2017~2037 52,457 EUR 40,000 2.60% 1.70% 1,311.42 Nomura 2017~2037 59,423 SEK 450,000 2.62% 2.36% 132.05 Kookmin Bank 2021~2026 114,230 USD 100,000 1.27% 1.25% 1,142.30 Korea Development Bank 2021~2026 114,230 USD 100,000 1.27% 1.25% 1,142.30 Hana Bank 2021~2026 114,230 USD 100,000 1.27% 1.25% 1,142.30 Korea Development Bank 2022~2027 123,710 USD 100,000 3.41% 3.63% 1,237.10 Woori Bank 2022~2027 123,710 USD 100,000 3.41% 3.63% 1,237.10 JP Morgan 2022~2027 123,710 USD 100,000 3.41% 3.63% 1,237.10 Korea Development Bank 2018~2023 320,880 USD 300,000 2.03% 3.75% 1,069.60 BNP Paribas 2019~2024 111,841 CHF 100,000 1.78% 0.13% 1,118.41 Kookmin Bank 2019~2024 111,841 CHF 100,000 1.78% 0.13% 1,118.41 Korea Development Bank 2022~2025 128,560 USD 100,000 3.37% 4.13% 1,285.60 Woori Bank 2022~2025 128,560 USD 100,000 3.37% 4.13% 1,285.60 Kookmin Bank 2022~2025 128,560 USD 100,000 3.37% 4.13% 1,285.60 Woori Bank 2021~2026 220,600 USD 200,000 0.47% 0.75% 1,103.00 Shinhan Bank 2021~2026 220,600 USD 200,000 0.47% 0.75% 1,103.00 Hana Bank 2021~2026 55,150 USD 50,000 0.48% 0.75% 1,103.00 Korea Development Bank 2018~2023 169,335 USD 150,000 2.26% 3.88% 1,128.90 Woori Bank 2018~2023 169,335 USD 150,000 2.26% 3.88% 1,128.90 Credit Agricole 2018~2023 112,890 USD 100,000 2.26% 3.88% 1,128.90 Hana Bank 2018~2023 56,445 USD 50,000 2.26% 3.88% 1,128.90 Kookmin Bank 2018~2023 56,445 USD 50,000 2.26% 3.88% 1,128.90 Woori Bank 2020~2025 245,560 USD 200,000 0.93% 1.75% 1,227.80 Hana Bank 2020~2025 245,560 USD 200,000 0.93% 1.75% 1,227.80 Korea Development Bank 2020~2025 122,780 USD 100,000 0.93% 1.75% 1,227.80 JP Morgan 2022~2025 126,180 USD 100,000 2.80% 3.60% 1,261.80 Hana Bank 2022~2025 126,180 USD 100,000 2.80% 3.60% 1,261.80 Korea Development Bank 2022~2025 252,360 USD 200,000 2.83% 3.60% 1,261.80 Woori Bank 2022~2025 126,180 USD 100,000 2.85% 3.60% 1,261.80
Interest Rate Swap Contracts Which Are Not Designated As Hedge Instruments	(5) Interest rate swap contracts which are not designated as hedging instruments as of December 31, 2022 are as follows: Counterparty Contract Contract amount Contract interest rate per annum Pay Receive In millions of won Nomura (*1) 2018~2038 30,000 2.56% 3.75% Hana Bank 2018~2023 200,000 2.15% 3M CD + 0.19% Hana Bank 2018~2023 200,000 2.17% 3M CD + 0.19% Hana Bank 2018~2023 150,000 2.03% 3M CD + 0.21% Hana Bank 2019~2024 200,000 1.87% 3M CD + 0.13% Shinhan Bank 2021~2025 100,000 2.32% 3M CD + 0.43% Hana Bank 2022~2027 200,000 3.02% 3M CD + 0.61% Hana Bank 2022~2027 200,000 3.04% 3M CD + 0.58% Hana Bank 2022~2027 250,000 3.38% 3M CD + 0.59% Nomura 2022~2027 200,000 3.55% 3M CD + 0.60% Shinhan Bank 2022~2027 150,000 3.53% 3M CD + 0.55% Hana Bank 2022~2027 200,000 3.70% 3M CD + 0.59% Nomura 2022~2027 300,000 3.89% 3M CD + 0.67% Hana Bank 2022~2027 200,000 3.93% 3M CD + 0.67% Nomura 2022~2027 200,000 3.80% 3M CD + 0.68% Nomura 2022~2027 300,000 4.04% 3M CD + 0.60% Hana Bank 2022~2027 100,000 4.68% 3M CD + 1.04% Hana Bank 2022~2027 100,000 5.45% 3M CD + 1.20% Nomura 2017~2032 52,457 3M Libor + 2.22% 2.60% Nomura 2017~2032 59,423 3M Libor + 2.24% 2.62% Nomura (*2) 2021~2041 30,000 1.84% 2.60% Nomura (*3) 2021~2041 50,000 1.87% 2.38% ANZ 2022 - 2025 AUD 540 0.48% 3.33% DBS Bank 2022 - 2025 AUD 540 0.48% 3.33% Societe Generale 2022 - 2025 AUD 540 0.48% 3.28% (*1) 2.56% of the contract paying interest rate is applied for five years from the date of issuance, and 3M CD + 0.10% is applied thereafter. Depending on the counterparty exercising the right, the contract may be early settled on the same date every year from June 15, 2023. (*2) 1.84% of the contract paying interest rate is applied for five years from the date of issuance, and 3M CMT + 0.35% is applied thereafter. (*3) 1.87% of the contract paying interest rate is applied for five years from the date of issuance, and 3M CMT + 0.35% is applied thereafter.
Interest Rate Swap Contracts Which Are Designated As Hedge Instruments	(6) Interest rate swap contracts which are designated as hedging instruments as of December 31, 2022 are as follows: Counterparty Contract Contract amount Contract interest rate per annum Pay Receive In thousands of USD Export-Import Bank of Korea 2015~2031 USD 15,893 2.67% 6M USD Libor ING Bank 2015~2031 USD 7,861 2.67% 6M USD Libor BNP Paribas 2015~2031 USD 7,861 2.67% 6M USD Libor BNP Paribas 2009~2027 USD 51,891 4.16% 6M USD Libor KFW 2009~2027 USD 51,891 4.16% 6M USD Libor Export-Import Bank of Korea 2016~2036 USD 66,124 3.00% 6M USD Libor
Disclosure of Gain Loss On Valuation And Transaction Derivatives	(7) Gain and loss on valuation and transaction of derivatives for the years ended December 31, 2020, 2021 and 2022 are as follows and included in finance income and expenses in the consolidated statements of comprehensive income (loss): Net income effects of Net income effects of Other comprehensive 2020 2021 2022 2020 2021 2022 2020 2021 2022 In millions of won Currency forward ￦ (40,590 ) 33,066 (20,570 ) (17,911 ) 33,032 (2,710 ) — — — Currency swap (406,607 ) 787,264 155,937 93,557 61,353 234,195 105,642 (59,108 ) (102,969 ) - Trading (108,090 ) 420,551 (77,618 ) 16,661 16,265 104,572 — — — - Hedging (298,517 ) 366,713 233,555 76,896 45,088 129,623 105,642 (59,108 ) (102,969 ) Interest rate swap (1,845 ) 18,123 66,341 (10,253 ) (10,303 ) (6,800 ) 5,578 18,648 37,917 - Trading (309 ) 18,123 66,341 (11,975 ) (10,303 ) (6,800 ) — — — - Hedging (1,536 ) — — 1,722 — — 5,578 18,648 37,917 Other derivatives (6,673 ) (15,459 ) 22,510 — — — — — — ￦ (455,715) 822,994 224,218 65,393 84,082 224,685 111,220 (40,460) (65,052) (*) For the year ended December 31, 2022, the net loss on valuation of derivatives applying cash flow hedge accounting of ￦24,415 million, net of tax, is included in other comprehensive income (loss).

Other Financial Assets (Tables)

Other Financial Assets (Tables)	12 Months Ended
	Dec. 31, 2022
Other Financial Assets [Abstract]
Summary of Other Financial Assets	(1) Other financial assets as of December 31, 2021 and 2022 are as follows: 2021 2022 Current Non-current Current Non-current In millions of won Loans ￦ 88,406 903,397 132,890 968,468 Less: Allowance for doubtful accounts (10 ) (52,667 ) (13 ) (54,824 ) Less: Present value discount (807 ) (29,248 ) (816 ) (32,334 ) 87,589 821,482 132,061 881,310 Long-term / short-term financial instruments 1,278,014 450,494 666,758 686,322 ￦ 1,365,603 1,271,976 798,819 1,567,632
Summary of Loans and Receivables	(2) Loans as of December 31, 2021 and 2022 are as follows: 2021 Face value Allowance for Present value Carrying value In millions of won Short-term loans Loans for tuition ￦ 28,975 — (807 ) 28,168 Loans for housing 25,750 — — 25,750 Other loans 33,681 (10 ) — 33,671 88,406 (10 ) (807 ) 87,589 Long-term loans Loans for tuition 431,002 (37,783 ) (29,248 ) 363,971 Loans for housing 282,833 — — 282,833 Loans for related parties 150,541 (14,861 ) — 135,680 Fisheries loan 203 — — 203 Other loans 38,818 (23 ) — 38,795 903,397 (52,667 ) (29,248 ) 821,482 ￦ 991,803 (52,677 ) (30,055 ) 909,071 2022 Face value Allowance for Present value Carrying value In millions of won Short-term loans Loans for tuition ￦ 30,261 — (816 ) 29,445 Loans for housing 29,630 — — 29,630 Other loans 72,999 (13 ) — 72,986 132,890 (13 ) (816 ) 132,061 Long-term loans Loans for tuition 436,131 (37,783 ) (32,334 ) 366,014 Loans for housing 309,446 — — 309,446 Loans for related parties 187,728 (17,041 ) — 170,687 Other loans 35,163 — — 35,163 968,468 (54,824 ) (32,334 ) 881,310 ￦ 1,101,358 (54,837 ) (33,150 ) 1,013,371
Summary of Changes in the Allowance for Doubtful Accounts of Loans and Receivables	(3) Changes in the allowance for doubtful accounts of loans for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Beginning balance ￦ 15,094 20,267 52,677 Bad debt expense 5,173 30,942 2,180 Other — 1,468 (20 ) Ending balance ￦ 20,267 52,677 54,837
Summary of Long-Term and Short-Term Financial Instruments	(4) Long-term and short-term financial instruments as of December 31, 2021 and 2022 are as follows: 2021 2022 Current Non-current Current Non-current In millions of won Time deposits ￦ 976,899 103,607 428,813 130,570 CD — — 30,000 — Others 301,115 346,887 207,945 555,752 ￦ 1,278,014 450,494 666,758 686,322

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2022
Classes of current inventories [abstract]
Summary of Inventories	Inventories as of December 31, 2021 and 2022 are as follows: 2021 Acquisition cost Valuation allowance Book In millions of won Raw materials ￦ 3,655,588 (1,247 ) 3,654,341 Merchandises 512 — 512 Work-in-progress 180,220 — 180,220 Finished goods 27,254 — 27,254 Supplies 2,541,028 (3,869 ) 2,537,159 Inventories-in-transit 1,195,148 — 1,195,148 Other inventories 13,548 — 13,548 ￦ 7,613,298 (5,116 ) 7,608,182 2022 Acquisition cost Valuation allowance Book In millions of won Raw materials ￦ 4,522,171 (1,350 ) 4,520,821 Merchandises 1,001 — 1,001 Work-in-progress 172,089 (75 ) 172,014 Finished goods 52,642 (57 ) 52,585 Supplies 2,814,377 — 2,814,377 Inventories-in-transit 2,356,444 — 2,356,444 Other inventories 13,490 — 13,490 ￦ 9,932,214 (1,482 ) 9,930,732

Non-Financial Assets (Tables)

Non-Financial Assets (Tables)	12 Months Ended
	Dec. 31, 2022
Disclosure Of Other Assets [Abstract]
Summary of Non-Financial Assets	Non-financial 2021 2022 Current Non-current Current Non-current In millions of won Advanced payments ￦ 161,466 124,305 160,596 51,425 Prepaid expenses 756,729 151,095 366,532 153,830 Others (*) 840,796 89,418 1,217,741 103,879 ￦ 1,758,991 364,818 1,744,869 309,134 (*) Details of others as of December 31, 2021 and 2022 are as follows: 2021 2022 Current Non-current Current Non-current In millions of won Greenhouse gas emissions rights ￦ 524,658 — 192,005 — Other quick assets 316,138 89,418 1,025,736 103,879 ￦ 840,796 89,418 1,217,741 103,879

Consolidated Subsidiaries (Tabl

Consolidated Subsidiaries (Tables)	12 Months Ended
	Dec. 31, 2022
Disclosure of subsidiaries [abstract]
Summary of Consolidated Subsidiaries	(1) Consolidated subsidiaries as of December 31, 2021 and 2022 are as follows: Percentage of ownership (%) Subsidiaries Key operation activities Location 2021 2022 Korea Hydro & Nuclear Power Co., Ltd. Power generation Korea 100.00 % 100.00 % Korea South-East Power Co., Ltd. Power generation Korea 100.00 % 100.00 % Korea Midland Power Co., Ltd. Power generation Korea 100.00 % 100.00 % Korea Western Power Co., Ltd. Power generation Korea 100.00 % 100.00 % Korea Southern Power Co., Ltd. Power generation Korea 100.00 % 100.00 % Korea East-West Power Co., Ltd. Power generation Korea 100.00 % 100.00 % KEPCO Engineering & Construction Company, Inc.(*1) Engineering and construction for utility plant and others Korea 65.77 % 65.77 % KEPCO Plant Service & Engineering Co., Ltd. Utility plant maintenance and others Korea 51.00 % 51.00 % KEPCO Nuclear Fuel Co., Ltd. Nuclear fuel Korea 96.36 % 96.36 % KEPCO KDN Co., Ltd. Electric power information technology and others Korea 100.00 % 100.00 % KEPCO International HongKong Ltd. Holding company Hong Kong 100.00 % 100.00 % KEPCO International Philippines Inc. Holding company Philippines 100.00 % 100.00 % KEPCO Gansu International Ltd. Holding company Hong Kong 100.00 % 100.00 % KEPCO Philippines Holdings Inc.(*11) Holding company Philippines 100.00 % 100.00 % KEPCO Philippines Corporation Operation of utility plant Philippines 100.00 % 100.00 % KEPCO Ilijan Corporation Construction and operation of utility plant Philippines 51.00 % 51.00 % KEPCO Lebanon SARL Operation of utility plant Lebanon 100.00 % 100.00 % KEPCO Neimenggu International Ltd. Holding company Hong Kong 100.00 % 100.00 % KEPCO Shanxi International Ltd. Holding company Hong Kong 100.00 % 100.00 % KOMIPO Global Pte Ltd. Holding company Singapore 100.00 % 100.00 % KEPCO Netherlands B.V. Holding company Netherlands 100.00 % 100.00 % KEPCO Australia Pty., Ltd. Resources development Australia 100.00 % 100.00 % KOSEP Australia Pty., Ltd. Resources development Australia 100.00 % 100.00 % KOMIPO Australia Pty., Ltd. Resources development Australia 100.00 % 100.00 % KOWEPO Australia Pty., Ltd. Resources development Australia 100.00 % 100.00 % KOSPO Australia Pty., Ltd. Resources development Australia 100.00 % 100.00 % KEPCO Middle East Holding Company Holding company Bahrain 100.00 % 100.00 % Qatrana Electric Power Company Construction and operation of utility plant Jordan 80.00 % 80.00 % KHNP Canada Energy Ltd. Holding company Canada 100.00 % 100.00 % KEPCO Bylong Australia Pty., Ltd. Resources development Australia 100.00 % 100.00 % Korea Waterbury Uranium Limited Partnership Resources development Canada 80.00 % 80.00 % KEPCO Holdings de Mexico Holding company Mexico 100.00 % 100.00 % KST Electric Power Company, S.A.P.I. de C.V. Construction and operation of utility plant Mexico 56.00 % 56.00 % KEPCO Energy Service Company Operation of utility plant Mexico 100.00 % 100.00 % KEPCO Netherlands S3 B.V. Holding company Netherlands 100.00 % 100.00 % PT. KOMIPO Pembangkitan Jawa Bali Operation of utility plant Indonesia 51.00 % 51.00 % PT. Cirebon Power Service(*2) Operation of utility plant Indonesia 27.50 % 27.50 % KOWEPO International Corporation Operation of utility plant Philippines 99.99 % 99.99 % KOSPO Jordan LLC Operation of utility plant Jordan 100.00 % 100.00 % EWP America Inc. Holding company USA 100.00 % 100.00 % EWP Renewable Corporation Holding company USA 100.00 % 100.00 % KNF Canada Energy Limited Holding company Canada 100.00 % 100.00 % EWP Barbados 1 SRL Holding company Barbados 100.00 % 100.00 % California Power Holdings, LLC Power generation USA 100.00 % 100.00 % Gyeonggi Green Energy Co., Ltd. Power generation Korea 62.01 % 62.01 % PT. Tanggamus Electric Power Power generation Indonesia 52.50 % 52.50 % Gyeongju Wind Power Co., Ltd. Power generation Korea 70.00 % 70.00 % KOMIPO America Inc. Holding company USA 100.00 % 100.00 % EWPRC Biomass Holdings, LLC Holding company USA 100.00 % — PT. EWP Indonesia Holding company Indonesia 99.96 % 99.96 % KEPCO Netherlands J3 B.V. Holding company Netherlands 100.00 % 100.00 % Korea Offshore Wind Power Co., Ltd. Power generation Korea 100.00 % 100.00 % Global One Pioneer B.V. Holding company Netherlands 100.00 % 100.00 % Global Energy Pioneer B.V. Holding company Netherlands 100.00 % 100.00 % Mira Power Limited(*3) Power generation Pakistan 76.00 % 76.00 % KOSEP Material Co., Ltd. Recycling fly ashes Korea 86.22 % 86.22 % Commerce and Industry Energy Co., Ltd.(*4) RDF power generation Korea 85.03 % 85.03 % KEPCO KPS Philippines Corp. Utility plant maintenance and others Philippines 99.99 % 99.99 % Percentage of ownership (%) Subsidiaries Key operation activities Location 2021 2022 KOSPO Chile SpA Holding company Chile 100.00 % 100.00 % PT. KOWEPO Sumsel Operation And Maintenance Services Utility plant maintenance and others Indonesia 95.00 % 95.00 % Hee Mang Sunlight Power Co., Ltd. Operation of utility plant Korea 100.00 % 100.00 % Fujeij Wind Power Company Operation of utility plant Jordan 100.00 % 100.00 % KOSPO Youngnam Power Co., Ltd.(*5) Operation of utility plant Korea 50.00 % 50.00 % Chitose Solar Power Plant LLC Power generation Japan 65.00 % 65.00 % KEPCO Energy Solution Co., Ltd. Energy service Korea 100.00 % 100.00 % KEPCO Solar Co., Ltd. Power generation Korea 100.00 % 100.00 % KOSPO Power Services Ltda. Utility plant maintenance and others Chile 65.00 % 65.00 % Energy New Industry Specialized Investment Private Investment Trust Holding company Korea 99.01 % 99.01 % KOEN Bylong Pty., Ltd. Resources development Australia 100.00 % 100.00 % KOMIPO Bylong Pty., Ltd. Resources development Australia 100.00 % 100.00 % KOWEPO Bylong Pty., Ltd. Resources development Australia 100.00 % 100.00 % KOSPO Bylong Pty., Ltd. Resources development Australia 100.00 % 100.00 % EWP Bylong Pty., Ltd. Resources development Australia 100.00 % 100.00 % KOWEPO Lao International Utility plant maintenance and others Laos 100.00 % 100.00 % KEPCO US Inc. Holding company USA 100.00 % 100.00 % KEPCO Alamosa LLC Holding company USA 50.10 % — KEPCO Solar of Alamosa LLC Power generation USA 100.00 % — KEPCO Mangilao Holdings LLC Holding company USA 100.00 % 100.00 % Mangilao Investment LLC Holding company USA 100.00 % 80.06 % KEPCO Mangilao Solar, LLC Power generation USA 100.00 % 100.00 % Jeju Hanlim Offshore Wind Co., Ltd. Power generation Korea 79.03 % 79.03 % PT. Siborpa Eco Power Construction and operation of utility plant Indonesia 55.00 % 55.00 % BSK E-New Holding company Korea 81.67 % 81.67 % e-New Holding company Korea 76.11 % 76.11 % Songhyun e-New Holding company Korea 80.65 % 80.65 % BSK E-New Holding company Korea 66.80 % 66.80 % PT. Korea Energy Indonesia Utility plant maintenance and others Indonesia 95.00 % 95.00 % KOLAT SpA Utility plant maintenance and others Chile 100.00 % 100.00 % KEPCO California, LLC Holding company USA 100.00 % 100.00 % KEPCO Mojave Holdings, LLC Holding company USA 100.00 % 100.00 % Incheon Fuel Cell Co., Ltd. Power generation Korea 60.00 % 60.00 % KOEN Service Co., Ltd. Facility maintenance and service Korea 100.00 % 100.00 % KOMIPO Service Co., Ltd. Facility maintenance and service Korea 100.00 % 100.00 % KOWEPO Service Co., Ltd. Facility maintenance and service Korea 100.00 % 100.00 % KOSPO Service Co., Ltd. Facility maintenance and service Korea 100.00 % 100.00 % EWP Service Co., Ltd. Facility maintenance and service Korea 100.00 % 100.00 % PT. KOMIPO Energy Indonesia Utility plant maintenance and others Indonesia 95.00 % 95.00 % KNF Partners Co., Ltd. Facility maintenance and service Korea 100.00 % 100.00 % KOSPO USA Inc. Holding company USA 100.00 % 100.00 % Nambu USA LLC Holding company USA 100.00 % 100.00 % Tamra Offshore Wind Power Co., Ltd. Power generation Korea 63.00 % 63.00 % KEPCO MCS Co., Ltd. Electric meter reading and others Korea 100.00 % 100.00 % KEPCO FMS Co., Ltd. Security service and others Korea 100.00 % 100.00 % Firstkeepers Co., Ltd. Facility maintenance and service Korea 100.00 % 100.00 % Secutec Co., Ltd. Security service Korea 100.00 % 100.00 % SE Green Energy Co., Ltd. Power generation Korea 84.80 % 84.80 % KEPCO Mangilao America LLC Holding company USA 100.00 % — Mangilao Intermediate Holdings LLC Holding company USA 100.00 % 100.00 % KEPCO CSC Co., Ltd. Facility maintenance and service Korea 100.00 % 100.00 % KOAK Power Limited Hydro power facility maintenance Pakistan 100.00 % 100.00 % KOMIPO Europe B.V. Holding company Netherlands 100.00 % 100.00 % Haenanum Energy Fund Holding company Korea 99.64 % 99.64 % Paju Ecoenergy Co., Ltd. Power generation Korea 89.00 % 89.00 % Guam Ukudu Power LLC Power generation USA 100.00 % 100.00 % K-SOLAR SHINAN Co., Ltd. (formerly, TS Energy No. 25 Co., Ltd.) Power generation Korea 90.00 % 90.00 % KPS Partners Co., Ltd. Facility maintenance and service Korea 100.00 % 100.00 % Percentage of ownership (%) Subsidiaries Key operation activities Location 2021 2022 KEPCO E&C Service Co., Ltd. Facility maintenance and service Korea 100.00 % 100.00 % Moha solar Co., Ltd. Power generation Korea 100.00 % 100.00 % Ogiri Solar Power Co., Ltd. Power generation Korea 70.00 % 70.00 % KHNP USA LLC Holding company USA 100.00 % 100.00 % KOMIPO Vanphong Power Service LLC Utility plant maintenance and others Vietnam 100.00 % 100.00 % Energy Innovation Fund I Holding company Korea 71.91 % 71.91 % KHNP Chile SpA Holding company Chile 100.00 % 100.00 % Yeong Yang Apollon Photovoltaic Co., Ltd. Power generation Korea 100.00 % 100.00 % Yeong Yang Corporation Co., Ltd. Power generation Korea 100.00 % 100.00 % SolarVader Co., Ltd. Power generation Korea 100.00 % 100.00 % Yeong Yang Innovation Co., Ltd. Power generation Korea 100.00 % 100.00 % Yeong Yang Horus Photovoltaic Co., Ltd. Power generation Korea 100.00 % 100.00 % Yeong Yang Solar Management Co., Ltd. Power generation Korea 100.00 % 100.00 % LSG Hydro Power Limited Holding company Pakistan 99.80 % 99.80 % KOEN Bio Co., Ltd. Wood pellet utilization business Korea 70.00 % 70.00 % KOMIPO Energy Solution America, LLC Holding company USA 100.00 % 100.00 % Elara Investment Holdings, LLC(*6) Holding company USA 0.10 % 0.10 % Elara Equity Holdings, LLC Holding company USA 54.00 % 54.00 % Elara Class B Holdings, LLC Holding company USA 100.00 % 100.00 % Elara Class B Member, LLC Holding company USA 100.00 % 100.00 % Elara Development Holdings, LLC Holding company USA 100.00 % 100.00 % KOMIPO Development, LLC (formerly, Elara Development, LLC) Holding company USA 100.00 % 100.00 % Elara Energy Holdings, LLC(*6) Holding company USA 43.94 % 43.94 % Elara Energy Project, LLC Power generation USA 100.00 % 100.00 % KOMIPO Iberian Solar Group, S.L.U. Holding company Spain 100.00 % 100.00 % Jeongam Wind Power Co., Ltd. Power generation Korea 80.00 % 80.00 % KOWEPO Europe B.V. Holding company Netherlands 100.00 % 100.00 % CVS Equity Holdings, LLC Holding company USA 100.00 % 81.34 % CVS Class B Holdings, LLC Holding company USA 100.00 % 100.00 % CVS Development Holdings, LLC Holding company USA 100.00 % 100.00 % CVS Development, LLC Holding company USA 100.00 % 100.00 % CVS Class B Member, LLC Holding company USA 100.00 % 100.00 % CVS Energy Holdings, LLC Holding company USA 100.00 % 70.79 % Concho Valley Energy, LLC Holding company USA 100.00 % 100.00 % Concho Valley Solar, LLC Power generation USA 100.00 % 100.00 % Yeongdeok Sunrise Wind Power Co., Ltd. Power generation Korea 70.00 % 70.00 % KHNP Spain, S.L. Holding company Spain 100.00 % 100.00 % UI Carbon-Neutrality Fund Holding company Korea — 78.97 % KA Power Limited Power generation Pakistan — 100.00 % Western Power Changgi Solar Co., Ltd. (formerly, Sam-Yang Photovoltaic Power Co., Ltd.)(*7) Power generation Korea — 100.00 % EWP Australia Pty., Ltd. Holding company Australia — 100.00 % Columboola Solar Farm Hold Co Pty., Ltd.(*8) Power generation Australia — 74.04 % Digital Innovation Growth Fund(*9) Holding company Korea — 76.92 % J Wind First, LLC(*10) Company specializing in liquidization Korea — — KEPCO Holding Company Holding company Saudi Arabia — 100.00 % KEPCO for Power Company Power generation Saudi Arabia — 60.00 % KEPCO for Maintenance Company Utility plant maintenance and others Saudi Arabia — 100.00 % KOSPO Trumbull LLC Holding company USA — 100.00 % Changjuk Wind Power Co., Ltd.(*9) Power generation Korea — 73.00 % (*1) Considering treasury stocks, the effective percentage of ownership is 66.08%. The Company is planning to sell part of its shares (14.77%) based on the resolution of the board of directors on June 24, 2022. (*2) The effective percentage of ownership is less than 50%. However, this subsidiary is included in the consolidated financial statements as the Company obtained the majority of the voting power under the shareholders’ agreement. (*3) As of the reporting date, the annual reporting period of all subsidiaries is December 31, except for Mira Power Limited. (*4) The Company guarantees a certain return on investment related to Commerce and Industry Energy Co., Ltd. for the financial investors. The financial investors have a right to sell their shares to the Company which can be exercised 36 months after the date of investment. Accordingly, the purchase price including the return on investment is classified as a liability. (*5) The subsidiary is included in the consolidated financial statements as the Company owns 50%+1 stake and has the ability to appoint a majority of the board members under the shareholders’ agreement. (*6) The effective percentage of ownership is less than 50%. However, this subsidiary is included in the consolidated financial statements as the Company has control over the board of directors under the shareholders’ agreement. (*7) For the year ended December 31, 2022, the Company included Western Power Changgi Solar Co., Ltd. as a subsidiary, considering that it acquired control over the entity after the entity undertook selective reduction of capital. (*8) Excluding preferred stocks, the percentage of ownership with voting rights is 100%. (*9) The entity was transferred from an associate to a subsidiary due to changes in the consolidated scope during the year ended December 31, 2022. (*10) Although the Company does not hold a stake as of December 31, 2022, considering the purpose and design of the structured entity, the Company is exposed to volatility in the profits of the structured entity. In addition, Group has the ability to direct activities that can most significantly affect the operations of the structured entity, so it has been determined that the Company has control over the entity. (*11) The Company is planning to sell its investment in KEPCO Philippines Holdings Inc., but time or proceeds of sales are not specified as of December 31, 2022.
Summary of Subsidiaries Newly Included in or Excluded from Consolidation	(2) Subsidiaries newly included in and excluded from consolidation for the year ended December 31, 2022 are as follows: Subsidiaries included in consolidation during the year ended December 31, 2022. Subsidiaries Reason UI Carbon-Neutrality Fund Newly established KA Power Limited Newly established Seobusambo highway photovoltaics Co., Ltd. Newly established Western Power Changgi Solar Co., Ltd. (formerly, Sam-Yang Photovoltaic Power Co., Ltd.) Change in the scope of consolidation EWP Australia Pty., Ltd. Newly established Columboola Solar Farm Hold Co Pty., Ltd. New investment Digital Innovation Growth Fund Change in the scope of consolidation J Wind First, LLC Newly established KEPCO Holding Company Newly established KEPCO for Power Company Newly established KEPCO for Maintenance Company Newly established KOSPO Trumbull LLC Newly established Changjuk Wind Power Co., Ltd. Change in the scope of consolidation Subsidiaries excluded from consolidation during the year ended December 31, 2022. Subsidiaries Reason EWPRC Biomass Holdings, LLC Liquidation KEPCO Solar of Alamosa LLC Disposal KEPCO Alamosa LLC Liquidation KEPCO Mangilao America LLC Liquidation Seobusambo highway photovoltaics Co., Ltd. Change in the scope of consolidation
Summary of Financial Information of Consolidated Subsidiaries	(3) Summary of financial information of consolidated subsidiaries as of and for the years ended December 31, 2021 and 2022 are as follows: 2021 Subsidiaries Total Total liabilities Sales Profit (loss) for the year In millions of won Korea Hydro & Nuclear Power Co., Ltd. ￦ 64,638,690 38,361,337 9,324,391 302,232 Korea South-East Power Co., Ltd. 11,487,325 6,510,826 5,188,856 (58,096 ) Korea Midland Power Co., Ltd. 13,761,908 9,912,907 5,353,915 60,737 Korea Western Power Co., Ltd. 10,822,780 7,116,671 4,970,805 (171,562 ) Korea Southern Power Co., Ltd. 11,350,984 7,099,881 5,671,989 (113,352 ) Korea East-West Power Co., Ltd. 9,895,739 5,163,005 4,743,030 10,872 KEPCO Engineering & Construction Company, Inc. 705,043 191,592 433,127 16,452 KEPCO Plant Service & Engineering Co., Ltd. 1,420,705 311,607 1,375,668 98,132 KEPCO Nuclear Fuel Co., Ltd. 837,249 405,614 323,729 25,799 KEPCO KDN Co., Ltd. 721,634 189,242 673,261 67,244 KEPCO International HongKong Ltd. 128,968 — — 341 KEPCO International Philippines Inc. 154,317 482 — 8,766 KEPCO Gansu International Ltd. 7,151 559 — (25 ) KEPCO Philippines Holdings Inc. 191,757 128 — 60,192 KEPCO Philippines Corporation 6,122 19 — (68 ) KEPCO Ilijan Corporation 259,069 38,555 60,532 12,981 KEPCO Lebanon SARL 1,729 9,794 — (86 ) KEPCO Neimenggu International Ltd. 241,299 3,106 — 16,762 KEPCO Shanxi International Ltd. 551,407 207,844 — 3,526 KOMIPO Global Pte Ltd. 302,340 1,351 — 11,462 KEPCO Netherlands B.V. 133,610 866 — 5,395 KEPCO Australia Pty., Ltd. 481 11 — 25 KOSEP Australia Pty., Ltd. 44,798 5,561 22,013 8,268 KOMIPO Australia Pty., Ltd. 54,162 5,648 22,013 5,942 KOWEPO Australia Pty., Ltd. 54,564 4,766 22,013 7,387 KOSPO Australia Pty., Ltd. 43,886 4,502 22,013 5,940 KEPCO Middle East Holding Company 104,068 89,756 — 1,144 Qatrana Electric Power Company 480,809 262,725 21,368 19,156 KHNP Canada Energy Ltd. 109,326 25 — 29 KEPCO Bylong Australia Pty., Ltd. 44,319 394,349 — (37,065 ) Korea Waterbury Uranium Limited Partnership 20,920 159 — (57 ) KEPCO Holdings de Mexico 148 27 — (8 ) KST Electric Power Company, S.A.P.I. de C.V. 584,625 435,796 151,467 18,499 KEPCO Energy Service Company 2,500 956 12,070 574 KEPCO Netherlands S3 B.V. 51,045 150 — 3,199 PT. KOMIPO Pembangkitan Jawa Bali 13,499 3,314 18,296 885 PT. Cirebon Power Service 2,545 631 8,664 505 KOWEPO International Corporation — 10 — — KOSPO Jordan LLC 33,782 16,298 9,698 816 EWP America Inc.(*1) 46,687 1,278 18,335 6,807 KNF Canada Energy Limited 2,101 17 — (43 ) EWP Barbados 1 SRL 354,024 1,172 2,861 16,168 Gyeonggi Green Energy Co., Ltd. 243,977 224,132 93,794 (5,588 ) PT. Tanggamus Electric Power 212,161 167,409 2,903 3,017 Gyeongju Wind Power Co., Ltd. 96,937 60,702 15,289 3,132 KOMIPO America Inc.(*2) 329,986 56,325 1,715 (1,311 ) PT. EWP Indonesia 47,031 1,226 — 4,615 KEPCO Netherlands J3 B.V. 151,478 172 — 27,365 Korea Offshore Wind Power Co., Ltd. 359,393 188,507 36,020 3,820 Global One Pioneer B.V. 119 116 — (132 ) Global Energy Pioneer B.V. 293 131 — (147 ) 2021 Subsidiaries Total Total liabilities Sales Profit (loss) for the year In millions of won Mira Power Limited ￦ 424,183 311,459 70,287 34,018 KOSEP Material Co., Ltd. 3,405 842 4,518 442 Commerce and Industry Energy Co., Ltd. 85,315 35,543 30,531 1,345 KEPCO KPS Philippines Corp. 8,051 3,652 9,768 1,493 KOSPO Chile SpA 142,956 56,688 — (851 ) PT. KOWEPO Sumsel Operation And Maintenance Services 116 259 — — Hee Mang Sunlight Power Co., Ltd. 6,242 3,272 499 47 Fujeij Wind Power Company 200,783 169,340 — 14,739 KOSPO Youngnam Power Co., Ltd. 393,745 292,765 318,770 6,339 Chitose Solar Power Plant LLC 125,578 109,470 16,630 1,794 KEPCO Energy Solution Co., Ltd. 317,676 4,938 21,423 3,104 KEPCO Solar Co., Ltd. 231,567 22,229 11,305 2,014 KOSPO Power Services Ltda. 8,007 5,800 21,133 (356 ) Energy New Industry Specialized Investment Private Investment Trust(*3) 336,932 28,536 19,405 11,116 KOEN Bylong Pty., Ltd. 8 86 — — KOMIPO Bylong Pty., Ltd. 8 86 — (8 ) KOWEPO Bylong Pty., Ltd. 8 86 — (18 ) KOSPO Bylong Pty., Ltd. 73 168 — (20 ) EWP Bylong Pty., Ltd. 8 54 — — KOWEPO Lao International 12,974 70 8,543 5,681 KEPCO US Inc. 17,601 — — — KEPCO Alamosa LLC 34,100 297 124 (62 ) KEPCO Solar of Alamosa LLC 57,104 41,953 8,008 (742 ) KEPCO Mangilao Holdings LLC 28,504 32,501 — (556 ) Mangilao Investment LLC 43,459 29 — (14 ) KEPCO Mangilao Solar, LLC 206,018 166,095 — (865 ) Jeju Hanlim Offshore Wind Co., Ltd. 41,325 5,139 — (2,893 ) PT. Siborpa Eco Power 11,306 — — (105 ) PT. Korea Energy Indonesia 1,917 215 1,681 37 KOLAT SpA 28,349 849 180 (464 ) KEPCO California, LLC 43,732 4,113 1,310 160 KEPCO Mojave Holdings, LLC 95,294 71,358 — (4,254 ) Incheon Fuel Cell Co., Ltd. 268,100 236,901 54,188 8,738 KOEN Service Co., Ltd. 8,963 6,557 35,190 2,326 KOMIPO Service Co., Ltd. 4,384 4,475 32,323 (96 ) KOWEPO Service Co., Ltd. 7,289 5,869 31,700 303 KOSPO Service Co., Ltd. 5,762 4,990 26,257 31 EWP Service Co., Ltd. 5,483 5,455 24,957 14 PT. KOMIPO Energy Indonesia 2,996 395 2,077 106 KNF partners Co., Ltd. 1,800 969 5,664 152 KOSPO USA Inc. 286,081 293 — 968 Nambu USA LLC 277,698 — — 568 Tamra Offshore Wind Power Co., Ltd. 146,736 106,961 21,731 5,168 KEPCO MCS Co., Ltd. 80,277 39,139 349,116 19,043 KEPCO FMS Co., Ltd. 17,188 15,577 94,210 214 Firstkeepers Co., Ltd. 17,152 16,041 77,189 19 Secutec Co., Ltd. 13,176 10,662 65,963 1,774 SE Green Energy Co., Ltd. 153,105 119,461 38,867 4,025 KEPCO Mangilao America LLC 2,173 1 — — Mangilao Intermediate Holdings LLC 220,690 205,421 — (6,975 ) KEPCO CSC Co., Ltd. 8,093 6,799 41,854 (2,101 ) KOAK Power Limited 14,363 393 — (551 ) 2021 Subsidiaries Total Total liabilities Sales Profit (loss) for the year In millions of won KOMIPO Europe B.V. ￦ 70,431 97 402 (503 ) Haenanum Energy Fund 7,463 3 40 (74 ) Paju Ecoenergy Co., Ltd. 57,795 2,118 15,425 2,234 Guam Ukudu Power LLC 30,133 30,438 — (2,030 ) K-SOLAR SHINAN Co., Ltd. (formerly, TS Energy No. 25 Co., Ltd.) 353,324 318,977 421 (7,525 ) KPS Partners Co., Ltd. 2,809 1,529 9,520 323 KEPCO E&C Service Co., Ltd. 4,054 1,889 15,985 1,242 Moha solar Co., Ltd. 32,808 33,933 48 (706 ) Ogiri Solar Power Co., Ltd. 1,041 1 — 9 KHNP USA LLC 766 10 1,001 267 KOMIPO Vanphong Power Service LLC 3,758 860 3,853 958 Energy Innovation Fund I 22,616 3,202 — (888 ) KHNP Chile SpA 5,294 3,879 — 17 Yeong Yang Apollon Photovoltaic Co., Ltd. 1,775 1,632 5 (30 ) Yeong Yang Corporation Co., Ltd. 1,776 1,623 9 (19 ) SolarVader Co., Ltd. 1,772 1,627 — (26 ) Yeong Yang Innovation Co., Ltd. 1,773 1,622 5 (21 ) Yeong Yang Horus Photovoltaic Co., Ltd. 1,771 1,624 9 (24 ) Yeong Yang Solar Management Co., Ltd. 1,774 1,625 — (23 ) LSG Hydro Power Limited 1 — — — KOEN Bio Co., Ltd. 394 199 51 (305 ) KOMIPO Iberian Solar Group, S.L.U. 70,993 56,707 — 1,354 Jeongam Wind Power Co., Ltd. 86,853 74,267 10,476 1,027 KOWEPO Europe B.V. 39,973 1,449 — (744 ) Yeongdeok Sunrise Wind Power Co., Ltd. 21,252 768 — (116 ) KHNP Spain, S.L. 5 — — — (*1) Financial information of EWP America Inc. includes that of three other subsidiaries, EWP Renewable Corporation, California Power Holdings, LLC and EWPRC Biomass Holdings, LLC. (*2) Financial information of KOMIPO America Inc. includes that of 17 other subsidiaries including Elara Equity Holdings, LLC and CVS Equity Holdings, LLC. (*3) Financial information of Energy New Industry Specialized Investment Private Investment Trust includes that of four other subsidiaries, BSK E-New e-New e-New E-New 2022 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won Korea Hydro & Nuclear Power Co., Ltd. ￦ 69,129,625 42,843,974 10,386,091 (16,382 ) Korea South-East Power Co., Ltd. 13,855,071 7,410,881 8,972,991 71,662 Korea Midland Power Co., Ltd. 16,062,605 10,776,943 8,629,165 (58,173 ) Korea Western Power Co., Ltd. 13,459,054 8,125,312 8,112,727 106,361 Korea Southern Power Co., Ltd. 14,011,354 8,296,983 9,304,362 (68,315 ) Korea East-West Power Co., Ltd. 12,079,954 5,818,789 6,925,094 2,888 KEPCO Engineering & Construction Company, Inc. 815,533 272,119 505,291 17,954 KEPCO Plant Service & Engineering Co., Ltd. 1,555,453 344,702 1,425,913 97,881 KEPCO Nuclear Fuel Co., Ltd. 949,455 490,215 304,405 31,508 KEPCO KDN Co., Ltd. 734,439 166,272 739,453 42,584 KEPCO International HongKong Ltd. 128,784 — — (216 ) KEPCO International Philippines Inc. 127,744 101 — 9,976 KEPCO Gansu International Ltd. 7,125 598 — (22 ) KEPCO Philippines Holdings Inc. 191,634 129 — 39,346 KEPCO Philippines Corporation 3,799 14 — 102 KEPCO Ilijan Corporation 231,132 3,642 23,263 16,455 KEPCO Lebanon SARL 1,890 10,482 — 20 KEPCO Neimenggu International Ltd. 269,582 3,917 — 9,938 KEPCO Shanxi International Ltd. 597,635 222,186 — (11,312 ) KOMIPO Global Pte Ltd. 388,071 1,817 — 58,030 KEPCO Netherlands B.V. 137,454 64 — 8,570 KEPCO Australia Pty., Ltd. 579 11 — 102 KOSEP Australia Pty., Ltd. 74,180 13,097 52,271 24,443 KOMIPO Australia Pty., Ltd. 81,216 10,327 52,272 23,368 KOWEPO Australia Pty., Ltd. 81,696 10,184 52,271 22,745 KOSPO Australia Pty., Ltd. 41,872 10,174 52,271 24,362 KEPCO Middle East Holding Company 116,731 102,054 — (634 ) Qatrana Electric Power Company 513,277 247,027 24,354 22,578 KHNP Canada Energy Ltd. 107,200 6,218 — 149 KEPCO Bylong Australia Pty., Ltd. 44,034 437,852 — (45,880 ) Korea Waterbury Uranium Limited Partnership 20,934 224 — (116 ) KEPCO Holdings de Mexico 728 1,974 — (1,363 ) KST Electric Power Company, S.A.P.I. de C.V. 653,830 528,315 232,893 23,122 KEPCO Energy Service Company 2,238 2,173 7,015 (211 ) KEPCO Netherlands S3 B.V. 71,326 16,419 — 4,465 PT. KOMIPO Pembangkitan Jawa Bali 15,753 3,232 22,488 3,668 PT. Cirebon Power Service 2,316 784 9,602 355 KOWEPO International Corporation — 10 — — KOSPO Jordan LLC 22,854 6,964 45,009 7,657 EWP America Inc.(*1) 47,775 2,595 21,717 4,337 KNF Canada Energy Limited 2,116 34 — (59 ) EWP Barbados 1 SRL 395,067 901 3,230 34,260 Gyeonggi Green Energy Co., Ltd. 220,414 226,517 112,524 (26,004 ) PT. Tanggamus Electric Power 227,638 163,106 3,781 5,778 Gyeongju Wind Power Co., Ltd. 98,513 55,579 24,888 9,711 KOMIPO America Inc.(*2) 571,200 317,903 34,059 (3,293 ) PT. EWP Indonesia 93,390 5 — 4,100 KEPCO Netherlands J3 B.V. 135,213 63 — 19,396 Korea Offshore Wind Power Co., Ltd. 376,449 192,335 52,526 13,083 Global One Pioneer B.V. 135 41 — (68 ) Global Energy Pioneer B.V. 320 40 — (64 ) Mira Power Limited 416,750 310,529 57,135 12,394 KOSEP Material Co., Ltd. 3,985 662 4,589 775 Commerce and Industry Energy Co., Ltd. 79,172 32,147 31,068 (3,730 ) KEPCO KPS Philippines Corp. 5,294 600 5,232 1,004 KOSPO Chile SpA 159,500 70,037 — (2,811 ) PT. KOWEPO Sumsel Operation And Maintenance Services 25 252 — (94 ) 2022 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won Hee Mang Sunlight Power Co., Ltd. ￦ 5,877 2,606 862 304 Fujeij Wind Power Company 213,113 163,690 — 16,564 KOSPO Youngnam Power Co., Ltd. 425,000 312,831 568,224 10,878 Chitose Solar Power Plant LLC 109,964 94,366 14,384 1,615 KEPCO Energy Solution Co., Ltd. 317,392 6,147 33,638 138 KEPCO Solar Co., Ltd. 243,221 25,405 24,778 9,305 KOSPO Power Services Ltda. 6,722 4,762 17,911 (358 ) Energy New Industry Specialized Investment Private Investment Trust(*3) 451,762 4,338 24,725 7,093 KOEN Bylong Pty., Ltd. 11 119 — (12 ) KOMIPO Bylong Pty., Ltd. 11 122 — (33 ) KOWEPO Bylong Pty., Ltd. 8 94 — (7 ) KOSPO Bylong Pty., Ltd. 25 148 — (17 ) EWP Bylong Pty., Ltd. 8 54 — 1 KOWEPO Lao International 8,248 87 10,010 11,185 KEPCO US Inc. 91 — — (19,181 ) KEPCO Mangilao Holdings LLC 112,948 40,558 21,743 21,166 Mangilao Investment LLC 258,674 4 — (1 ) KEPCO Mangilao Solar, LLC 240,736 373 8,870 (14,818 ) Jeju Hanlim Offshore Wind Co., Ltd. 185,357 111,343 — (3,546 ) PT. Siborpa Eco Power 12,050 3 — (39 ) PT. Korea Energy Indonesia 1,675 80 1,937 (104 ) KOLAT SpA 48,787 3,701 1,647 1,888 KEPCO California, LLC 46,151 4,768 596 (670 ) KEPCO Mojave Holdings, LLC 95,550 75,846 — (4,705 ) Incheon Fuel Cell Co., Ltd. 268,063 242,176 107,193 (5,323 ) KOEN Service Co., Ltd. 9,353 7,035 36,340 356 KOMIPO Service Co., Ltd. 6,597 4,503 35,031 905 KOWEPO Service Co., Ltd. 6,266 3,130 34,031 171 KOSPO Service Co., Ltd. 6,672 5,048 28,321 60 EWP Service Co., Ltd. 3,756 2,507 24,526 581 PT. KOMIPO Energy Indonesia 2,978 368 1,698 83 KNF partners Co., Ltd. 2,285 1,053 5,997 293 KOSPO USA Inc. 315,018 430 — 5,024 Nambu USA LLC 297,516 — — 670 Tamra Offshore Wind Power Co., Ltd. 133,598 93,639 18,332 5,316 KEPCO MCS Co., Ltd. 114,316 52,241 363,627 8,468 KEPCO FMS Co., Ltd. 16,852 11,667 105,339 2,176 Firstkeepers Co., Ltd. 16,448 12,912 84,620 2,482 Secutec Co., Ltd. 12,578 9,209 69,383 690 SE Green Energy Co., Ltd. 149,189 114,241 49,873 1,304 Mangilao Intermediate Holdings LLC 236,266 116,426 — (4,709 ) KEPCO CSC Co., Ltd. 10,668 8,937 46,559 (2,134 ) KOAK Power Limited 12,626 839 — 49 KOMIPO Europe B.V. 81,364 54 1,195 1,134 Haenanum Energy Fund 7,416 3 — (48 ) Paju Ecoenergy Co., Ltd. 61,930 3,066 20,718 1,290 Guam Ukudu Power LLC 293,422 323,292 — (31,410 ) K-SOLAR 320,227 296,141 16,980 3,690 KPS Partners Co., Ltd. 3,619 2,007 12,417 487 KEPCO E&C Service Co., Ltd. 5,676 1,897 16,180 1,493 Moha solar Co., Ltd. 29,096 31,359 169 (1,137 ) Ogiri Solar Power Co., Ltd. 1,033 23 — (30 ) KHNP USA LLC 1,290 97 1,127 392 KOMIPO Vanphong Power Service LLC 15,940 3,333 20,233 9,871 Energy Innovation Fund I 35,310 445 — (961 ) KHNP Chile SpA 5,547 4,147 — (16 ) Yeong Yang Apollon Photovoltaic Co., Ltd. 1,566 1,507 254 (82 ) 2022 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won Yeong Yang Corporation Co., Ltd. ￦ 1,559 1,497 251 (91 ) SolarVader Co., Ltd. 1,568 1,500 256 (78 ) Yeong Yang Innovation Co., Ltd. 1,557 1,497 244 (91 ) Yeong Yang Horus Photovoltaic Co., Ltd. 1,552 1,498 243 (93 ) Yeong Yang Solar Management Co., Ltd. 1,573 1,500 262 (75 ) LSG Hydro Power Limited 1,144 1,159 — (18 ) KOEN Bio Co., Ltd. 261 219 639 (150 ) KOMIPO Iberian Solar Group, S.L.U. 78,094 65,012 — (1,304 ) Jeongam Wind Power Co., Ltd. 81,800 68,317 10,722 892 KOWEPO Europe B.V. 42,865 2,422 — 1,668 Yeongdeok Sunrise Wind Power Co., Ltd. 42,187 22,031 — (328 ) KHNP Spain, S.L. 3 — — (1 ) KA Power Limited 3,937 418 — 442 Western Power Changgi Solar Co., Ltd. (formerly, Sam-Yang 48,770 44,647 3,447 (354 ) EWP Australia Pty., Ltd. 51,105 — — 15,203 Columboola Solar Farm Hold Co Pty., Ltd. 310,271 214,792 2,228 2,884 Digital Innovation Growth Fund 12,594 100 — (363 ) J Wind First, LLC 33,611 33,611 450 — KEPCO Holding Company 3,273 17 — (18 ) KEPCO for Power Company 57,501 58,441 — (960 ) KEPCO for Maintenance Company — — — — KOSPO Trumbull LLC 37 3 — — Changjuk Wind Power Co., Ltd. 29,208 3,137 9,027 3,503 (*1) Financial information of EWP America Inc. includes that of two other subsidiaries, EWP Renewable Corporation, and California Power Holdings, LLC. (*2) Financial information of KOMIPO America Inc. includes that of 17 other subsidiaries including Elara Equity Holdings, LLC and CVS Equity Holdings, LLC. (*3) Financial information of Energy New Industry Specialized Investment Private Investment Trust includes that of five other subsidiaries, BSK E-New e-New e-New E-New
Summary of Significant Restrictions on Abilities to Subsidiaries	(4) Significant restrictions on abilities to subsidiaries are as follows: Company Nature and extent of any significant restrictions Gyeonggi Green Energy Co., Ltd. Acquisition or disposal of assets of more than ￦35 billion, change in the capacity of cogeneration units (except for the change due to performance improvement of equipment, maintenance) will require unanimous consent of all directors of the Company. KOSPO Youngnam Power Co., Ltd. Dividends can only be paid when all conditions of the loan agreement are satisfied, or prior written consent of financial institutions is obtained. Group’s shares cannot be wholly or partially transferred without prior written consent of financial institutions. Jeongam Wind Power Co., Ltd. Dividends can only be paid when all conditions of the loan agreement are satisfied, and payments to the contracting party may be restricted depending on the financial management priority of the contract. Group’s shares cannot be wholly or partially transferred without prior consent of other stakeholders including shareholders or financial institutions. Incheon Fuel Cell Co., Ltd. Acquisition or disposal of assets of more than ￦20 billion, change in the capacity of cogeneration units (except for the change due to performance improvement of equipment, maintenance) will require unanimous consent of all directors of the Company. Gyeongju Wind Power Co., Ltd. Dividends and settlement amounts for O&M and renewable energy certificate can only be paid when all conditions of the loan agreement are satisfied and prior written consent of financial institutions is obtained. Korea Offshore Wind Power Co., Ltd. Principals and interest payments on subordinated loans or dividends and settlement amounts for renewable energy certificate can only be paid when all conditions of the loan agreement are satisfied and prior written consent of financial institutions is obtained. Jeju Hanlim Offshore Wind Co., Ltd. Prior approval from the lender is required when withdrawing funds (major expenditure, REC settlement, dividend payment, etc.) according to the loan agreement. Yeongdeok Sunrise Wind Power Co., Ltd. Dividends can only be paid when all conditions of the loan agreement are satisfied. Columboola Solar Farm Hold Co Pty., Ltd. Dividends can only be paid when all conditions of the loan agreement are satisfied.
Summary of Entitlements in Relation to Subsidiaries as per Shareholder Agreements	(5) As of December 31, 2022, the Company has following entitlements in relation to its subsidiaries as per its shareholder’s agreements: Company Unrecognized Commitments Jeongam Wind Power Co., Ltd. When the Company requests other shareholders to transfer shares after the completion of the power generation complex, the Company has a right to purchase the shares at fair value. Changjuk Wind Power Co., Ltd. When other shareholders want to sell their shares after the performance guarantee period of wind power generators stipulated in the equipment supply contract is completed, the Company has an obligation to purchase the shares at fair value after consulting with the parties on the timing and size of the acquisition, taking in to account financial conditions, business conditions, and other circumstances. Columboola Solar Farm Hold Co Pty., Ltd. The Company holds a call option to purchase the shares held by another shareholder at 80
Summary of Non-Controlling Interest Prior to Intra-Group Eliminations	(6) Details of non-controlling 2020 Description KEPCO Ilijan KEPCO Plant KEPCO Construction Others Total In millions of won Percentage of ownership 49.00 % 49.00 % 33.92 % Current assets ￦ 236,602 755,454 235,805 801,813 2,029,674 Non-current 85,464 590,403 463,439 3,499,258 4,638,564 Current liabilities (12,322 ) (254,495 ) (186,296 ) (414,673 ) (867,786 ) Non-current (34,912 ) (42,020 ) (13,873 ) (2,511,848 ) (2,602,653 ) Net assets 274,832 1,049,342 499,075 1,374,550 3,197,799 Book value of non-controlling 134,668 514,177 169,286 552,519 1,370,650 Sales 81,400 1,299,186 431,723 956,692 2,769,001 Profit for the period 39,443 85,916 20,160 107,661 253,180 Profit for the period attributable to non-controlling 19,327 42,099 6,838 33,342 101,606 Cash flows from operating activities 121,835 74,159 15,225 240,987 452,206 Cash flows from investing activities 7,561 26,748 (34,333 ) (661,820 ) (661,844 ) Cash flows from financing activities before dividends to non-controlling (31,793 ) (47,809 ) (9,165 ) 371,448 282,681 Dividends to non-controlling (30,319 ) (42,336 ) (4,000 ) (4,643 ) (81,298 ) Effect of exchange rate fluctuation (8,153 ) (2,171 ) (22 ) (7,893 ) (18,239 ) Net increase (decrease) of cash and cash equivalents 59,131 8,591 (32,295 ) (61,921 ) (26,494 ) 2021 Description KEPCO Ilijan KEPCO Plant KEPCO Construction Others Total In millions of won Percentage of ownership 49.00 % 49.00 % 33.92 % Current assets ￦ 234,224 793,995 253,958 1,030,049 2,312,226 Non-current 24,845 626,710 451,085 3,838,233 4,940,873 Current liabilities (30,783 ) (265,017 ) (183,100 ) (599,373 ) (1,078,273 ) Non-current (7,772 ) (46,590 ) (8,492 ) (2,666,345 ) (2,729,199 ) Net assets 220,514 1,109,098 513,451 1,602,564 3,445,627 Book value of non-controlling 108,052 543,458 174,163 720,761 1,546,434 Sales 60,532 1,375,668 433,127 1,286,002 3,155,329 Profit for the year 12,981 98,132 16,452 128,264 255,829 Profit for the year attributable to non-controlling 6,361 48,085 5,581 28,914 88,941 Cash flows from operating activities 116,440 133,160 (16,270 ) 303,577 536,907 Cash flows from investing activities 2,216 (39,444 ) 19,061 (309,447 ) (327,614 ) Cash flows from financing activities before dividends to non-controlling (88,927 ) (30,599 ) (8,467 ) 125,685 (2,308 ) Dividends to non-controlling — (25,269 ) (3,639 ) (2,608 ) (31,516 ) Effect of exchange rate fluctuation 10,683 885 38 7,243 18,849 Net increase (decrease) of cash and cash equivalents 40,412 38,733 (9,277 ) 124,450 194,318 F-9 4 2022 Description KEPCO Ilijan KEPCO Plant KEPCO Construction Others Total In millions of won Percentage of ownership 49.00 % 49.00 % 33.92 % Current assets ￦ 230,031 861,705 372,031 1,147,973 2,611,740 Non-current 1,101 693,748 443,502 4,942,229 6,080,580 Current liabilities (3,642 ) (316,497 ) (243,796 ) (841,521 ) (1,405,456 ) Non-current — (28,205 ) (28,323 ) (2,944,145 ) (3,000,673 ) Net assets 227,490 1,210,751 543,414 2,304,536 4,286,191 Book value of non-controlling 111,470 593,268 184,326 565,796 1,454,860 Sales 23,263 1,425,913 505,291 1,709,390 3,663,857 Profit for the year 16,455 97,881 17,954 91,566 223,856 Profit for the year attributable to non-controlling 8,063 47,962 6,090 (24,370 ) 37,745 Cash flows from operating activities 68,475 81,419 4,918 231,653 386,465 Cash flows from investing activities 22,604 27,372 18,712 (747,507 ) (678,819 ) Cash flows from financing activities before dividends to non-controlling (9,609 ) (33,187 ) (7,260 ) 582,580 532,524 Dividends to non-controlling (8,834 ) (26,438 ) (3,071 ) (4,001 ) (42,344 ) Effect of exchange rate fluctuation 8,807 (486 ) 5 (11,023 ) (2,697 ) Net increase of cash and cash equivalents 81,443 48,680 13,304 51,702 195,129
Summary of Changes in Goodwill	(i) Details of goodwill as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Acquisition cost ￦ 105,647 100,093 Less: Accumulated impairment — — Carrying book value ￦ 105,647 100,093 (ii) Changes in goodwill for the years ended December 31, 2021 and 2022 are as follows: 2021 Beginning Increase Decrease Others Ending In millions of won Acquisition cost ￦ 98,166 7,481 — — 105,647 Less: Accumulated impairment — — — — — Carrying book value ￦ 98,166 7,481 — — 105,647 2022 Beginning Increase Decrease Others Ending In millions of won Acquisition cost ￦ 105,647 — — (5,554 ) 100,093 Less: Accumulated impairment — — — — — Carrying book value ￦ 105,647 — — (5,554 ) 100,093
Summary of Cash Dividends Received from Subsidiaries	(9) Cash dividends received from subsidiaries for the years ended December 31, 2020, 2021 and 2022, respectively, are as follows: Subsidiaries 2020 2021 2022 In millions of won Korea Hydro & Nuclear Power Co., Ltd. ￦ 106,675 279,779 136,010 Korea South-East Power Co., Ltd. 11,905 — 4,808 Korea Midland Power Co., Ltd. — — 24,694 Korea East-West Power Co., Ltd. 17,959 — 4,866 KEPCO Engineering & Construction Company, Inc. 7,793 7,089 5,983 KEPCO Plant Service & Engineering Co., Ltd. 44,068 26,301 27,517 KEPCO Nuclear Fuel Co., Ltd. 7,270 5,206 11,184 KEPCO KDN Co., Ltd. 14,720 18,854 36,986 KEPCO Energy Solution Co., Ltd. — — 1,707 KEPCO Solar Co., Ltd. — — 1,409 KEPCO International HongKong Ltd. 11,858 — 9,044 KEPCO Philippines Corporation — — 2,375 KEPCO Ilijan Corporation 34,502 7,955 9,195 KEPCO Philippines Holdings Inc. 70,876 60,520 34,913 KOSEP Australia Pty., Ltd. 1,856 — — KOSPO Australia Pty., Ltd. — 3,095 31,386 KEPCO Netherlands B.V. 11,098 — 16,795 Qatrana Electric Power Company — 2,615 2,751 KEPCO KPS Philippines Corp. 1,215 — 302 Tamra Offshore Wind Power Co., Ltd. 2,640 — 2,877 KEPCO Netherlands S3 B.V. 6,981 — 4,005 PT. KOMIPO Pembangkitan Jawa Bali — 153 859 PT. EWP Indonesia — — 4,262 Gyeongju Wind Power Co., Ltd. 2,800 2,800 2,100 VI Carbon Professional Private Special Asset Investment Trust 1 7 — — KOSPO Power Services Limitada — — 305 KEPCO Netherlands J3 B.V. — 27,237 46,510 PT. Cirebon Power Service 221 — 241 Chitose Solar Power Plant LLC 858 — 639 Fujeij Wind Power Company 6,306 11,920 15,102 KOSPO Jordan LLC 535 731 11,450 EWP America Inc. — — 3,887 KOWEPO Lao International — — 12,106 Energy Innovation Fund I 19 — — ￦ 362,162 454,255 466,268

Investments in Associates and_2

Investments in Associates and Joint Ventures (Tables)	12 Months Ended
	Dec. 31, 2022
Investments in Associates and Joint Ventures [Abstract]
Summary of Investments in Associates and Joint Ventures	(1) Investments in associates and joint ventures as of December 31, 2021 and 2022 are as follows: 2021 Investees Key operation activities Location Percentage of Acquisition Book value In millions of won <Associates> Korea Gas Corporation(*1) Importing and wholesaling LNG Korea 20.47 % ￦ 94,500 1,815,513 Korea Electric Power Industrial Development Co., Ltd. Electricity metering and others Korea 29.00 % 4,727 24,617 YTN Co., Ltd. Broadcasting Korea 21.43 % 59,000 51,828 Gangwon Wind Power Co., Ltd.(*2) Power generation Korea 15.00 % 5,725 10,554 Hyundai Green Power Co., Ltd. Power generation equipment consignment and operation service Korea 29.00 % 88,885 121,955 Korea Power Exchange(*3) Management of power market and others Korea 100.00 % 127,839 269,728 Taebaek Wind Power Co., Ltd. Power generation Korea 25.00 % 3,810 6,800 Taebaek Guinemi Wind Power Co., Ltd. Power generation Korea 25.00 % 3,420 3,357 Pyeongchang Wind Power Co., Ltd. Power generation Korea 25.00 % 3,875 5,411 Daeryun Power Co., Ltd.(*2) Power generation Korea 9.34 % 40,854 25,426 Changjuk Wind Power Co., Ltd. Power generation Korea 30.00 % 3,801 8,355 KNH Solar Co., Ltd. Power generation Korea 27.00 % 1,296 2,278 SPC Power Corporation Power generation Philippines 38.00 % 20,635 65,046 Gemeng International Energy Co., Ltd. Power generation China 34.00 % 413,153 595,218 PT. Cirebon Electric Power Power generation Indonesia 27.50 % 40,365 121,969 KNOC Nigerian East Oil Co., Ltd.(*4) Resources development Nigeria 14.63 % 12 — KNOC Nigerian West Oil Co., Ltd.(*4) Resources development Nigeria 14.63 % 12 — PT Wampu Electric Power Power generation Indonesia 46.00 % 21,292 35,077 PT. Bayan Resources TBK Resources development Indonesia 20.00 % 615,860 661,289 S-Power Co., Ltd. Power generation Korea 49.00 % 132,300 122,786 Pioneer Gas Power Limited Power generation India 38.50 % 49,831 — Eurasia Energy Holdings Power generation and resources development Russia 40.00 % 461 — Xe-Pian Xe-Namnoy Power Co., Ltd. Power generation Laos 25.00 % 87,426 92,441 PT. Mutiara Jawa Manufacturing and operating floating coal terminal Indonesia 29.00 % 2,978 2,569 Samcheok Eco Materials Co., Ltd.(*5) Recycling fly ashes Korea 2.35 % 686 — Noeul Green Energy Co., Ltd. Power generation Korea 29.00 % 1,740 3,808 Goseong Green Power Co., Ltd. Power generation Korea 29.00 % 262,740 260,858 Gangneung Eco Power Co., Ltd.(*2) Power generation Korea 1.61 % 2,900 2,288 Shin Pyeongtaek Power Co., Ltd. Power generation Korea 40.00 % 72,000 93,074 Haeng Bok Do Si Photovoltaic Power Co., Ltd. Power generation Korea 28.00 % 194 223 Dongducheon Dream Power Co., Ltd.(*6) Power generation Korea 33.61 % 148,105 74,198 Jinbhuvish Power Generation Pvt. Ltd.(*2) Power generation India 5.16 % 9,000 — Daejung Offshore Wind Power Co., Ltd. Power generation Korea 46.59 % 5,190 1,704 GS Donghae Electric Power Co., Ltd. Power generation Korea 34.00 % 204,000 243,772 Daegu Photovoltaic Co., Ltd. Power generation Korea 29.00 % 1,230 2,342 Busan Green Energy Co., Ltd. Power generation Korea 29.00 % 5,243 5,032 Gunsan Bio Energy Co., Ltd.(*2) Power generation Korea 18.87 % 1,000 — Korea Electric Vehicle Charging Service(*2) Electric vehicle charge service Korea 17.50 % 2,800 1,250 Hansuwon KNP Co., Ltd. Electric material agency Korea 28.98 % 537 219 Korea Electric Power Corporation Fund(*7) Developing electric enterprises Korea 98.09 % 48,410 47,983 Energy Infra Asset Management Co., Ltd.(*2) Asset management Korea 9.90 % 297 1,066 Daegu clean Energy Co., Ltd. Renewable power generation Korea 28.00 % 140 12 YaksuESS Co., Ltd. Installing ESS related equipment Korea 29.00 % 210 716 Nepal Water & Energy Development Company Private Limited(*8) Construction and operation of utility plant Nepal 69.06 % 70,228 66,333 Gwangyang Green Energy Co., Ltd. Power generation Korea 20.00 % 26,800 25,466 PND Solar Co., Ltd. Power generation Korea 29.00 % 1,250 1,229 Hyundai Eco Energy Co., Ltd.(*2) Power generation Korea 19.00 % 3,610 5,572 YeongGwang Yaksu Wind Electric Co., Ltd.(*2) Power generation Korea 9.63 % 533 233 Green Energy Electricity Generation Co., Ltd. Power generation Korea 29.00 % 1,189 1,713 2021 Investees Key operation activities Location Percentage of Acquisition Book value In millions of won <Associates> Korea Energy Solutions Co., Ltd. R & D Korea 20.00 % ￦ 300 123 ITR Co., Ltd. R & D Korea 20.00 % 50 32 Structure test network Co., Ltd. Technical testing and consulting Korea 20.00 % 25 306 Namjeongsusang Solar Power Operation Co., Ltd.(*9) Power generation Korea 15.00 % 969 361 Indeck Niles Development, LLC(*10) Power generation USA 56.25 % 268,113 246,273 Indeck Niles Asset Management, LLC Power generation USA 33.33 % — 111 Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 Holding company Korea 49.00 % 7,112 7,138 Suwon New Power Co., Ltd. Power generation Korea 39.90 % 798 1,035 KPGE Inc. Power generation materials business Korea 29.00 % 287 309 Gwangbaek Solar Power Investment Co., Ltd. Power generation Korea 44.00 % 4,757 4,806 Go deok Clean Energy Co., Ltd. Fuel cell generation Korea 40.00 % 5,560 4,302 SureDataLab Co., Ltd. R & D Korea 23.95 % 126 128 SEP Co., Ltd. R & D Korea 21.26 % 27 7 Hankook Electric Power Information Co., Ltd. R & D Korea 25.25 % 38 161 Tronix Co., Ltd. R & D Korea 20.00 % 75 109 O2&B Global Co., Ltd. R & D Korea 20.00 % 25 35 Muan Sunshine Solar Power Plant Co., Ltd. Power generation Korea 20.00 % 1,570 1,268 Bigeum Resident Photovoltaic Power Co., Ltd. Power generation Korea 29.90 % 1 — Goesan Solar Park Co., Ltd. Power generation Korea 29.00 % 1,276 1,927 Saemangeum Heemang Photovoltaic Co., Ltd. Power generation Korea 35.00 % 11,022 10,238 Bitgoel Eco Energy Co., Ltd. Power generation Korea 29.00 % 4,640 4,356 Jeju Gimnyeong Wind Power Co., Ltd. Power generation Korea 30.00 % 714 911 Seoroseoro Sunny Power Plant Co., Ltd. Power generation Korea 42.58 % 706 721 Muan Solar Park Co., Ltd. Power generation Korea 20.00 % 4,400 6,083 YuDang Solar Co., Ltd. Power generation Korea 20.00 % 360 565 Anjwa Smart Farm & Solar City Co., Ltd. Power generation Korea 20.00 % 5,651 6,784 Daewon Green Energy Co., Ltd. Power generation Korea 25.36 % 3,910 3,877 G.GURU Co., Ltd. R & D Korea 24.65 % 493 403 UD4M Co., Ltd.(*2) R & D Korea 12.50 % 75 144 Dongbu Highway Solar Co., Ltd. Power generation Korea 20.00 % 190 265 Seobu Highway Solar Co., Ltd. Power generation Korea 20.00 % 195 289 Korea Energy Data Co., Ltd. R & D Korea 29.37 % 60 62 Gangneung Sacheon Fuel Cell Co., Ltd.(*7) Power generation Korea 65.00 % 1,950 1,878 Kosture Co., Ltd.(*2) Coal recycling business Korea 0.26 % — — Digital Innovation Growth Fund(*7) Holding company Korea 76.92 % 10,000 9,890 Taebaek Gadeoksan Wind Power Co., Ltd.(*18) Power generation Korea 39.65 % 12,570 16,495 Chuncheon Green Energy Co., Ltd.(*7) Power generation Korea 68.00 % 3,400 3,372 Yeomsubong Wind Power Co., Ltd. Power generation Korea 48.72 % 95 95 Yeongyang Wind Power Corporation II Power generation Korea 30.00 % 7,965 7,965 Haeparang Energy Co., Ltd. Power generation Korea 25.00 % 2,241 2,241 Saemangeum Sebit Power Plant Co., Ltd.(*7) Power generation Korea 69.55 % 6,000 6,000 3,059,835 5,232,373 <Joint ventures> KEPCO-Uhde Inc.(*11) Power generation Korea 52.80 % 11,355 58 Shuweihat Asia Power Investment B.V. Holding company Netherlands 49.00 % 44,405 37,069 Shuweihat Asia Operation & Maintenance Company(*11) Maintenance of utility plant Cayman 55.00 % 30 1,380 Waterbury Lake Uranium L.P. Resources development Canada 33.10 % 26,602 21,590 ASM-BG Investicii AD Power generation Bulgaria 50.00 % 16,101 18,692 RES Technology AD Power generation Bulgaria 50.00 % 15,595 16,703 KV Holdings, Inc. Power generation Philippines 40.00 % 2,103 2,527 2021 Investees Key operation activities Location Percentage of Acquisition Book value In millions of won <Joint ventures> KEPCO SPC Power Corporation(*11) Construction and operation of utility plant Philippines 75.20 % ￦ 94,579 198,979 Gansu Datang Yumen Wind Power Co., Ltd. Power generation China 40.00 % 16,621 6,635 Datang Chifeng Renewable Power Co., Ltd. Power generation China 40.00 % 121,928 204,587 Datang KEPCO Chaoyang Renewable Power Co., Ltd. Power generation China 40.00 % 39,872 44,217 Rabigh Electricity Company Power generation Saudi Arabia 40.00 % 109,743 143,678 Rabigh Operation & Maintenance Company Limited Maintenance of utility plant Saudi Arabia 40.00 % 70 4,071 Jamaica Public Service Company Limited Power generation Jamaica 40.00 % 301,910 294,649 KW Nuclear Components Co., Ltd. Manufacturing Korea 45.00 % 833 15,734 Busan Shinho Solar Power Co., Ltd. Power generation Korea 25.00 % 2,100 5,841 Global Trade Of Power System Co., Ltd.(*12) Exporting products and technology of small or medium business by proxy Korea 29.00 % 290 597 Expressway Solar-light Power Generation Co., Ltd.(*12) Power generation Korea 29.00 % 1,856 3,084 Amman Asia Electric Power Company(*11) Power generation Jordan 60.00 % 111,476 178,679 KAPES, Inc.(*11) R & D Korea 51.00 % 5,629 — Honam Wind Power Co., Ltd. Power generation Korea 29.00 % 3,480 4,041 Korea Power Engineering Service Co., Ltd. Construction and service Korea 29.00 % 290 5,415 Chun-cheon Energy Co., Ltd. Power generation Korea 29.90 % 52,700 25,896 Yeonggwangbaeksu Wind Power Co., Ltd.(*12) Power generation Korea 15.00 % 3,000 2,728 Nghi Son 2 Power LLC Power generation Vietnam 50.00 % 2,781 — Kelar S.A.(*11) Power generation Chile 65.00 % 78,060 86,695 PT. Tanjung Power Indonesia Power generation Indonesia 35.00 % 26,892 46,546 Incheon New Power Co., Ltd.(*13) Power generation Korea 29.00 % 461 — Seokmun Energy Co., Ltd. Power generation Korea 29.00 % 15,370 13,842 Daehan Wind Power PSC Power generation Jordan 50.00 % 7,493 5,154 Barakah One Company(*14) Power generation UAE 18.00 % 118 — Nawah Energy Company(*14) Operation of utility plant UAE 18.00 % 296 294 Momentum International thermonuclear experimental reactor construction management France 33.33 % 1 368 Daegu Green Power Co., Ltd.(*15) Power generation Korea 29.00 % 46,225 24,054 Yeonggwang Wind Power Co., Ltd. Power generation Korea 46.00 % 17,475 17,646 Chester Solar IV SpA Power generation Chile 45.00 % 1,700 — Chester Solar V SpA Power generation Chile 45.00 % 525 25 Diego de Almagro Solar SpA Power generation Chile 45.00 % 2,091 362 South Jamaica Power Company Limited Power generation Jamaica 20.00 % 20,430 37,360 Daesan Green Energy Co., Ltd. Power generation Korea 35.00 % 17,850 21,244 RE Holiday Holdings LLC Power generation USA 50.00 % 42,948 73,167 RE Pioneer Holdings LLC Power generation USA 50.00 % 27,891 47,015 RE Barren Ridge 1 Holdings LLC Power generation USA 50.00 % 28,021 1,883 RE Astoria 2 LandCo LLC Power generation USA 50.00 % 5,188 5,998 RE Barren Ridge LandCo LLC Power generation USA 50.00 % 2,187 2,120 Laurel SpA Power generation Chile 45.00 % 1,222 290 KIAMCO KOWEPO Bannerton Hold Co Pty Ltd(*12) Power generation Australia 12.37 % 4,095 3,625 Chile Solar JV SpA Power generation Chile 50.00 % 37,689 32,457 Cheong-Song Noraesan Wind Power Co., Ltd. Power generation Korea 29.01 % 3,200 4,106 Chester Solar I SpA Power generation Chile 45.00 % 1,181 1,120 Solar Philippines Calatagan Corporation Power generation Philippines 38.00 % 47,903 58,231 Saemangeum Solar Power Co., Ltd.(*16) Power generation Korea 81.01 % 26,400 23,939 Chungsongmeon BongSan wind power Co., Ltd.(*12) Power generation Korea 29.00 % 2,900 3,808 Jaeun Resident Wind Power Plant Co., Ltd. Power generation Korea 29.00 % 2,494 1,958 2021 Investees Key operation activities Location Percentage of Acquisition Book value In millions of won <Joint ventures> DE Energia SpA Power generation Chile 49.00 % ￦ 8,364 8,921 Dangjin Eco Power Co., Ltd. Power generation Korea 34.00 % 25,661 26,109 Haemodum Solar Co., Ltd. Power generation Korea 49.00 % 2,940 3,081 Yangyang Wind Power Co., Ltd. Power generation Korea 50.00 % 12,000 11,191 Horus Solar, S.A. De C.V.(*17) Renewable power generation Mexico 14.95 % 5,068 5,842 Recursos Solares PV De Mexico II, S.A. De C.V.(*17) Renewable power generation Mexico 14.95 % 3,678 4,536 Sunmex Renovables, S.A. De C.V.(*17) Renewable power generation Mexico 14.95 % 1,678 1,610 Stavro Holding II A.B. Holding company Sweden 20.00 % 17,615 17,627 Solaseado Solar Power Co., Ltd. Power generation Korea 38.90 % 7,020 9,891 Yeongam Solar Power Co., Ltd.(*12) Power generation Korea 19.00 % 6,460 6,838 Samsu Wind Power Co., Ltd.(*12) Power generation Korea 19.00 % 2,637 2,828 Pulau Indah Power Plant Sdn. Bhd. Power generation Malaysia 25.00 % 23,833 22,099 Sam-Yang Photovoltaic Power Co., Ltd. Power generation Korea 49.00 % 5,245 4,993 NH-Amundi Global Infrastructure Investment Private Investment Trust 21 Holding company Korea 29.53 % 19,983 21,456 Shin-han BNPP Private Investment Trust for East-West Sunlight Dream(*11) Holding company Korea 90.00 % 15,699 16,288 PT Barito Wahana Tenaga Power generation Indonesia 30.61 % 59,535 81,595 Cheongna Energy Co., Ltd.(*16) Generating and distributing vapor and hot/cold water Korea 50.10 % 49,344 11,198 Naepo Green Energy Co., Ltd. Power generation Korea 29.20 % 29,200 — Dayone Energy Co., Ltd.(*19) Power generation Korea 30.66 % 71,070 — OneEnergy Asia Limited Power generation Vietnam 40.00 % 76,916 79,700 KAS Investment I LLC Holding company USA 29.89 % 23,437 15,273 KAS Investment II LLC Holding company USA 29.89 % 23,343 15,213 Energyco Co., Ltd. Power generation Korea 29.00 % 1,659 1,535 CAES, LLC Holding company USA 36.00 % 19,414 18,435 Hapcheon Floating Photovoltaic Power Plant Inc.(*12) Power generation Korea 49.00 % 7,512 6,971 Busan Industrial Solar Power Co., Ltd. Power generation Korea 28.02 % 510 612 Bitsolar Energy Co., Ltd. Power generation Korea 27.10 % 352 352 Pulau Indah O&M Sdn. Bhd.(*20) Power generation Malaysia 60.00 % — — Guadalupe Solar SpA(*20) Power generation Chile 60.00 % 1,397 659 Omisan Wind Power Co., Ltd. Power generation Korea 42.00 % 10,752 10,633 Foresight Iberian Solar Group Holding, S.L.(*20) Power generation Spain 75.00 % 9,697 9,743 Yeongwol Eco Wind Co., Ltd. Power generation Korea 29.00 % 3,089 3,196 Gurae Resident Power Co., Ltd. Power generation Korea 29.00 % 386 395 Cheongju Eco Park Co., Ltd. Power generation Korea 29.00 % 5,858 5,465 Enel X Midland Photovoltaic, LLC Power generation Korea 20.00 % 1,695 1,688 Geumsungsan Wind Power Co., Ltd. Power generation Korea 29.00 % 6,531 6,053 KEPCO KPS Carabao Corp. Utility plant maintenance Philippines 40.00 % 93 386 Prime Swedish Holding AB Holding company Sweden 45.00 % 14,514 15,441 Goheung New Energy Co., Ltd. Power generation Korea 46.15 % 12,959 11,708 Gunsan Land Solar Co., Ltd.(*20) Power generation Korea 75.29 % 19,091 19,317 CapMan Lynx SCA, SICAR Holding company Luxembourg 50.00 % 9,601 9,976 International Offshore Power Transmission Holding Company Limited Undersea transmission network operation UAE 35.00 % — — 2,069,491 2,239,011 ￦ 5,129,326 7,471,384 (*1) Due to changes in equity, the nominal and effective percentage of ownership are 20.47%. (*2) The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint directors to the board of directors of the entity, and by strict decision criteria of the Company’s financial and operating policy of the board of directors. (*3) The effective percentage of ownership is 100%. However, the Government regulates the Company’s ability to make operating and financial decisions over the entity, as the Government requires maintaining arms-length transactions between KPX and the Company’s other subsidiaries. Accordingly, the entity is not classified as a consolidated subsidiary. The Company can exercise significant influence by virtue of right to nominate directors to the board of directors of the entity. (*4) The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint one out of four members of the steering committee of the entity. Moreover, the Company has significant financial transactions, which can affect its significant influence on the entity. (*5) Although the nominal percentage of ownership is 2.35%, the effective percentage of ownership is 25.54%, considering redeemable convertible preferred stock as a liability component. (*6) The effective percentage of ownership is 34.01% considering the conversion of redeemable convertible preferred stock into ordinary stock. (*7) The effective percentage of ownership is more than 50% but the Company does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. Accordingly, the entity is classified as an associate. (*8) The effective percentage of ownership is more than 50% but the Company does not hold control over the entity according to the shareholders’ agreement. Accordingly, the entity is classified as an associate. (*9) The effective percentage of ownership is less than 20%. However, the Company considers the major decision-making body to be the general decision of the board of directors, and the general decision of the board of directors can be passed only by two directors of Namjeongsusang Solar Power Operation Co., Ltd. Accordingly, the entity is classified as an associate. (*10) According to the shareholders’ agreement, additional investment of 50% of total stake is agreed by March 2022. (*11) The effective percentage of ownership is more than 50%. However, according to the shareholders’ agreement, all critical financial and operating decisions must be agreed to by all ownership parties. Accordingly, the entities are classified as joint ventures. (*12) According to the shareholders’ agreement, the parties have joint control over all decisions related to finance and operation. Accordingly, the entity is classified as joint ventures. (*13) The joint arrangement which the Company has joint control is structured through a separate company. The parties have joint control over the joint arrangement are classified as joint ventures, judging that they have rights to the net assets of the arrangement. (*14) The effective percentage of ownership is less than 20%. However, decisions in relevant actitvities must be agreed by ownership parties. Accordingly, the entity is classified as joint ventures. (*15) Although the nominal percentage of ownership is 29%, the effective percentage of ownership is 54.24%, considering the interest of financial investors as a liability component. (*16) The effective percentage of ownership is more than 50%. However, decisions in relevant actitvities must be agreed by all ownership parties. Accordingly, the entity is classified as a joint venture. (*17) The effective percentage of ownership is less than 20%. However, according to the shareholders’ agreement, decisions related pricipal operation must be agreed by all ownership parties. Accordingly, the Company can exercise significant influence. (*18) The percentage of ownership decreased due to the unequal capital increase. The entity was reclassified from a joint venture to an associate, due to the changes in voting rights. (*19) According to the Dayone Energy Co., Ltd. Investment Agreement signed in March 2011, the Company has a commitment to guarantee principal and certain returns on shares of Dayone Energy Co., Ltd. held by NH Power 2nd Co., Ltd. and the National Agricultural Cooperative Federation. Since NH Power 2nd Co., Ltd. and the National Agricultural Cooperative Federation have put option regarding their share of the entity, the Company was deemed to have acquired an additional 15.64% stake. As a result, the effective percentage of ownership is 46.3% in the current and prior period. In accordance with shareholders’ agreement signed during the current period, the Company has joint control with other investors in making important financial and operation decisions, so it has been reclassified from an associate to a joint venture. (*20) The effective percentage of ownership is more than 50%. However, decisions in relevant actitvities must be agreed by all ownership parties. Accordingly, the entity is classified as a joint venture. 2022 Investees Key operation activities Location Percentage of Acquisition Book value In millions of won <Associates> Korea Gas Corporation Importing and wholesaling LNG KOREA 20.47 % ￦ 94,500 2,085,296 Korea Electric Power Industrial Development Co., Ltd. Electricity metering and others KOREA 29.00 % 4,727 31,078 YTN Co., Ltd.(*1) Broadcasting KOREA 21.43 % 59,000 55,027 Gangwon Wind Power Co., Ltd.(*2) Power generation KOREA 15.00 % 5,725 12,158 Hyundai Green Power Co., Ltd. Power generation equipment consignment and operation service KOREA 29.00 % 88,885 119,791 Korea Power Exchange(*3) Management of power market and others KOREA 100.00 % 127,839 275,126 Taebaek Wind Power Co., Ltd.(*29) Power generation KOREA 60.00 % 11,494 14,501 Taebaek Guinemi Wind Power Co., Ltd.(*29) Power generation KOREA 67.25 % 12,637 13,049 Daeryun Power Co., Ltd.(*2) Power generation KOREA 6.85 % 40,854 26,727 KNH Solar Co., Ltd. Power generation KOREA 27.00 % 1,296 2,883 SPC Power Corporation(*30) Power generation PHILIPPINES 38.00 % 20,635 70,868 Gemeng International Energy Co., Ltd. Power generation CHINA 34.00 % 413,153 578,821 PT. Cirebon Electric Power Power generation INDONESIA 27.50 % 40,365 135,114 KNOC Nigerian East Oil Co., Ltd.(*4) Resources development NIGERIA 14.63 % 12 — KNOC Nigerian West Oil Co., Ltd.(*4) Resources development NIGERIA 14.63 % 12 — PT Wampu Electric Power Power generation INDONESIA 46.00 % 21,292 37,743 PT. Bayan Resources TBK Resources development INDONESIA 20.00 % 615,860 684,719 S-Power Co., Ltd. Power generation KOREA 49.00 % 132,300 141,128 Pioneer Gas Power Limited Power generation INDIA 38.50 % 49,831 — Eurasia Energy Holdings Power generation and resources development RUSSIA 40.00 % 461 — Xe-Pian Xe-Namnoy Power Co., Ltd. Power generation LAOS 25.00 % 87,426 115,584 PT. Mutiara Jawa Manufacturing and operating floating coal terminal INDONESIA 29.00 % 2,978 3,597 Samcheok Eco Materials Co., Ltd.(*5) Recycling fly ashes KOREA 2.35 % 686 — Noeul Green Energy Co., Ltd. Power generation KOREA 29.00 % 1,740 — Goseong Green Power Co., Ltd. Power generation KOREA 29.00 % 262,740 288,893 Gangneung Eco Power Co., Ltd.(*2) Power generation KOREA 1.61 % 2,900 — Shin Pyeongtaek Power Co., Ltd. Power generation KOREA 40.00 % 72,000 133,823 Haeng Bok Do Si Photovoltaic Power Co., Ltd. Power generation KOREA 28.00 % 194 278 Dongducheon Dream Power Co., Ltd.(*6) Power generation KOREA 33.61 % 148,105 89,300 Jinbhuvish Power Generation Pvt. Ltd.(*2) Power generation INDIA 5.16 % 9,000 — Daejung Offshore Wind Power Co., Ltd. Power generation KOREA 46.59 % 5,190 1,555 GS Donghae Electric Power Co., Ltd. Power generation KOREA 34.00 % 204,000 260,145 Daegu Photovoltaic Co., Ltd. Power generation KOREA 29.00 % 1,230 2,849 Busan Green Energy Co., Ltd. Power generation KOREA 29.00 % 5,243 4,395 Gunsan Bio Energy Co., Ltd.(*2) Power generation KOREA 18.87 % 1,000 — Hansuwon KNP Co., Ltd. Electric material agency KOREA 28.98 % 537 280 Korea Electric Power Corporation Fund(*7) Developing electric enterprises KOREA 98.09 % 23,113 28,842 Energy Infra Asset Management Co., Ltd.(*2) Asset management KOREA 9.90 % 297 1,184 Daegu clean Energy Co., Ltd. Renewable power generation KOREA 28.00 % 140 12 YaksuESS Co., Ltd. Installing ESS related equipment KOREA 29.00 % 210 486 Nepal Water & Energy Development Company Private Limited (*8) Construction and operation of utility plant NEPAL 69.06 % 70,228 69,940 Gwangyang Green Energy Co., Ltd. Power generation KOREA 20.00 % 26,800 25,044 PND solar Co., Ltd. Power generation KOREA 29.00 % 1,250 1,403 Hyundai Eco Energy Co., Ltd.(*2) Power generation KOREA 19.00 % 3,610 7,631 YeongGwang Yaksu Wind Electric Co., Ltd.(*2) Power generation KOREA 9.63 % 533 156 Green Energy Electricity Generation Co., Ltd. Power generation KOREA 29.00 % 1,189 1,571 2022 Investees Key operation activities Location Percentage of Acquisition Book value In millions of won <Associates> Korea Energy Solutions Co., Ltd. R & D KOREA 20.00 % ￦ 300 93 ITR Co., Ltd. R & D KOREA 20.00 % 50 — Structure test network Co., Ltd. Technical testing and consulting KOREA 20.00 % 25 366 Namjeongsusang Solar Power Operation Co., Ltd.(*9) Power generation KOREA 15.00 % 969 373 Indeck Niles Development, LLC Power generation USA 50.00 % 263,825 302,038 Indeck Niles Asset Management, LLC Power generation USA 33.33 % — 94 Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 Holding company KOREA 49.00 % 6,910 6,932 Suwon New Power Co., Ltd. Power generation KOREA 39.90 % 798 919 Gwangbaek Solar Power Investment Co., Ltd. Power generation KOREA 44.00 % 4,757 5,133 Go deok Clean Energy Co., Ltd. Fuel cell generation KOREA 40.00 % 5,560 4,420 SureDataLab Co., Ltd. R & D KOREA 23.95 % 126 177 SEP Co., Ltd. R & D KOREA 21.26 % 27 — Hankook Electric Power Information Co., Ltd. (*13) R & D KOREA 16.49 % 38 220 Tronix Co., Ltd. (*13) R & D KOREA 12.50 % 75 66 O2&B Global Co., Ltd. R & D KOREA 20.00 % 25 36 Muan Sunshine Solar Power Plant Co., Ltd. Power generation KOREA 20.00 % 1,570 2,562 Bigeum Resident Photovoltaic Power Co., Ltd. Power generation KOREA 29.90 % 1 — Goesan Solar Park Co., Ltd. Power generation KOREA 29.00 % 1,276 2,591 Saemangeum Heemang Photovoltaic Co., Ltd. Power generation KOREA 35.00 % 11,022 13,010 Bitgoel Eco Energy Co., Ltd. Power generation KOREA 49.25 % 7,880 8,951 Jeju Gimnyeong Wind Power Co., Ltd. Power generation KOREA 30.00 % 714 872 Seoroseoro Sunny Power Plant Co., Ltd. Power generation KOREA 42.58 % 706 859 Muan Solar park Co., Ltd. Power generation KOREA 20.00 % 4,400 7,838 YuDang Solar Co., Ltd. Power generation KOREA 20.00 % 360 586 Anjwa Smart Farm & Solar City Co., Ltd. Power generation KOREA 20.00 % 5,651 8,662 Daewon Green Energy Co., Ltd. Power generation KOREA 25.36 % 3,910 4,485 G.GURU Co., Ltd. R & D KOREA 24.65 % 493 300 UD4M Co., Ltd.(*10) R & D KOREA 12.50 % 75 161 Dongbu Highway Solar Co., Ltd. Power generation KOREA 20.00 % 190 352 Seobu Highway Solar Co., Ltd. Power generation KOREA 20.00 % 195 316 Korea Energy Data Co., Ltd. R & D KOREA 29.37 % 60 62 Gangneung Sacheon Fuel Cell Co., Ltd. Power generation KOREA 41.00 % 5,695 4,277 KOSTURE Co., Ltd.(*2) Coal recycling business KOREA 0.82 % 1 1 Taebaek Gadeoksan Wind Power Co., Ltd. Power generation KOREA 34.00 % 12,570 20,040 Chuncheon Green Energy Co., Ltd. Power generation KOREA 45.00 % 9,540 9,155 Yeomsubong Wind Power Co., Ltd. (*11) Power generation KOREA 3.81 % 95 62 Yeongyang Wind Power Corporation II Power generation KOREA 30.00 % 7,965 7,461 Haeparang Energy Co., Ltd. Power generation KOREA 25.00 % 2,241 2,188 Saemangeum Sebit Power Plant Co., Ltd.(*12) Power generation KOREA 63.33 % 13,788 23,199 Boulder Solar III, LLC Power generation USA 30.00 % 715 744 PlatformN. Co., Ltd. R & D KOREA 29.58 % 105 84 PT. Cirebon Energi Prasarana (*9) Power generation INDONESIA 10.00 % 26,710 69,035 Green Radiation Co., Ltd. (*13) R & D KOREA 10.00 % 20 11 Future Convergence Technology Laboratory. Co., Ltd. R & D KOREA 20.12 % 76 50 SC E&G. Co,. Ltd. R & D KOREA 20.00 % 90 214 Wang San Engineering. Co,. Ltd. R & D KOREA 20.00 % 81 166 ACE R & D KOREA 20.00 % 20 20 Environment and Energy Co., Ltd. (*13) R & D KOREA 10.54 % 11 10 Santiago Solar Power SpA Power generation CHILE 50.00 % 13,851 13,373 Yanggu Floating Photovoltaic Power Plant Inc. Power generation KOREA 29.00 % 904 903 3,089,683 5,844,464 2022 Investees Key operation activities Location Percentage of Acquisition Book value In millions of won <Joint ventures> KEPCO-Uhde Inc.(*14) Power generation KOREA 52.80 % ￦ 11,355 17 Shuweihat Asia Power Investment B.V. Holding company NETHERLANDS 49.00 % 44,405 66,452 Shuweihat Asia Operation & Maintenance Company(*14) Maintenance of utility plant CAYMAN 55.00 % 30 1,631 Waterbury Lake Uranium L.P. (*15) Resources development CANADA 32.59 % 26,602 21,750 ASM-BG Investicii AD Power generation BULGARIA 50.00 % 9,846 14,555 RES Technology AD Power generation BULGARIA 50.00 % 11,922 15,133 KV Holdings, Inc. (*30) Power generation PHILIPPINES 40.00 % 2,103 9,659 KEPCO SPC Power Corporation(*14,30) Construction and operation of utility plant PHILIPPINES 75.20 % 94,579 179,594 Gansu Datang Yumen Wind Power Co., Ltd. Power generation CHINA 40.00 % 16,621 6,024 Datang Chifeng Renewable Power Co., Ltd. Power generation CHINA 40.00 % 121,928 191,982 Datang KEPCO Chaoyang Renewable Power Co., Ltd. Power generation CHINA 40.00 % 39,872 44,398 Rabigh Electricity Company Power generation SAUDI ARABIA 40.00 % 109,743 214,607 Rabigh Operation & Maintenance Company Limited Maintenance of utility plant SAUDI ARABIA 40.00 % 70 5,113 Jamaica Public Service Company Limited Power generation JAMAICA 40.00 % 301,910 331,407 KW Nuclear Components Co., Ltd. Manufacturing KOREA 45.00 % 833 17,090 Busan Shinho Solar Power Co., Ltd. Power generation KOREA 25.00 % 2,100 6,719 Global Trade Of Power System Co., Ltd.(*16) Exporting products and technology of small or medium business by proxy KOREA 29.00 % 290 698 Expressway Solar-light Power Generation Co., Ltd.(*17) Power generation KOREA 50.00 % 1,856 4,754 Amman Asia Electric Power Company(*14) Power generation JORDAN 60.00 % 111,476 220,254 KAPES, Inc.(*14) R & D KOREA 51.00 % 5,629 — Honam Wind Power Co., Ltd. Power generation KOREA 29.00 % 3,480 4,819 Korea Power Engineering Service Co., Ltd. Construction and service KOREA 29.00 % 290 5,543 Chun-cheon Energy Co., Ltd. Power generation KOREA 29.90 % 52,700 32,044 Yeonggwangbaeksu Wind Power Co., Ltd.(*16) Power generation KOREA 15.00 % 3,000 3,151 Nghi Son 2 Power LLC Power generation VIETNAM 50.00 % 175,261 408,839 Kelar S.A.(*14) Power generation CHILE 65.00 % 78,060 117,137 PT. Tanjung Power Indonesia Power generation INDONESIA 35.00 % 57,039 92,907 Incheon New Power Co., Ltd.(*18) Power generation KOREA 29.00 % 461 198 Seokmun Energy Co., Ltd. Power generation KOREA 29.00 % 15,370 17,336 Daehan Wind Power PSC Power generation JORDAN 50.00 % 7,493 13,923 Barakah One Company(*19) Power generation UAE 18.00 % 118 — Nawah Energy Company(*19) Operation of utility plant UAE 18.00 % 296 315 Momentum International thermonuclear experimental reactor construction management FRANCE 33.33 % 1 345 Daegu Green Power Co., Ltd.(*20) Power generation KOREA 29.00 % 46,225 29,360 Yeonggwang Wind Power Co., Ltd. Power generation KOREA 46.00 % 17,475 20,713 Chester Solar IV SpA Power generation CHILE 45.00 % 1,700 181 Chester Solar V SpA Power generation CHILE 45.00 % 525 156 Diego de Almagro Solar SpA Power generation CHILE 45.00 % 2,091 540 South Jamaica Power Company Limited Power generation JAMAICA 20.00 % 20,430 46,437 Daesan Green Energy Co., Ltd. Power generation KOREA 35.00 % 17,850 19,218 RE Holiday Holdings LLC Power generation USA 50.00 % 42,948 85,370 RE Pioneer Holdings LLC Power generation USA 50.00 % 27,891 55,172 RE Barren Ridge 1 Holdings LLC Power generation USA 50.00 % 28,021 3,350 RE Astoria 2 LandCo LLC Power generation USA 50.00 % 5,188 6,599 RE Barren Ridge LandCo LLC Power generation USA 50.00 % 2,187 2,333 Laurel SpA Power generation CHILE 45.00 % 1,222 554 KIAMCO KOWEPO Bannerton Hold Co Pty Ltd(*16) Power generation AUSTRALIA 12.37 % 4,095 3,651 Chile Solar JV SpA Power generation CHILE 50.00 % 12,674 9,819 Cheong-Song Noraesan Wind Power Co., Ltd.(*15) Power generation KOREA 29.01 % 3,200 4,263 Chester Solar I SpA Power generation CHILE 45.00 % 1,181 1,314 Solar Philippines Calatagan Corporation Power generation PHILIPPINES 38.00 % 47,903 56,902 Saemangeum Solar Power Co., Ltd.(*21) Power generation KOREA 81.01 % 26,400 23,551 Chungsongmeon BongSan wind power Co., Ltd.(*16) Power generation KOREA 29.00 % 2,900 3,470 2022 Investees Key operation activities Location Percentage of Acquisition Book value In millions of won <Joint ventures> Jaeun Resident Wind Power Plant Co., Ltd.(*16) Power generation KOREA 29.00 % ￦ 2,494 2,236 DE Energia SpA Power generation CHILE 49.00 % 8,364 9,536 Dangjin Eco Power Co., Ltd. Power generation KOREA 34.00 % 25,661 26,859 Haemodum Solar Co., Ltd. Power generation KOREA 49.00 % 2,940 3,367 Yangyang Wind Power Co., Ltd. Power generation KOREA 50.00 % 12,000 10,864 HORUS SOLAR, S.A. DE C.V. (*22) Renewable power generation MEXICO 14.95 % 5,068 6,976 RECURSOS SOLARES PV DE MEXICO II, S.A. DE C.V. (*22) Renewable power generation MEXICO 14.95 % 3,678 4,899 SUNMEX R
Summary of Fair Value Associates	(2) The fair value of associates which are actively traded on an open market and have a readily available market value as of December 31, 2021 and 2022 are as follows: Investees 2021 2022 In millions of won <Associates> Korea Electric Power Industrial Development Co., Ltd. ￦ 115,339 80,454 Korea Gas Corporation(*) 738,990 684,180 YTN Co., Ltd. 26,550 50,220 SPC Power Corporation 203,589 134,814 PT. Bayan Resources TBK 1,495,801 1,132,601 (*) An indicator of impairment has been identified for the Company’s investment in Korea Gas Corporation (“KOGAS”) for the years ended December 31, 2021 and 2022 as management determined that the carrying amount of the investment in KOGAS at ￦1,815,513 million and ￦2,085,296 million respectively were significantly higher than its fair value. Accordingly, management has assessed the recoverable amount of the investment by estimating the Company’s share of the present value of the estimated future cash flows expected to be generated by KOGAS. The carrying amount of KOGAS as at December 31, 2021 and 2022 are supported by the recoverable amount determination and as such, no impairment has been recognized for the years ended December 31, 2021 and 2022. The recoverable amount estimate is most sensitive to assumptions regarding long-term revenue forecasts as well as the discount rate: • Revenue forecasts: price and volume of gas sold are based on the long-term natural gas supply and demand programs approved by the Ministry of Trade, Industry & Energy. • Discount rate: the discount rate is derived using the weighted average cost of capital methodology adjusted for any risks that are not reflected in the underlying cash flows. A real post-tax discount rate of 4.90% and 5.20% was applied to post-tax cash flows respectively as at December 31, 2021 and 2022. Changes in circumstances may affect the assumptions used to determine recoverable amount and could result in an impairment of KOGAS at future reporting dates.
Summary of Changes in Investments in Associates and Joint Ventures	(3) Changes in investments in associates and joint ventures for the years ended December 31, 2021 and 2022 are as follows: 2021 Investees Beginning Acquisitions Disposals Dividends Share of (loss) Other (loss) Others Ending In millions of won <Associates> Korea Gas Corporation ￦ 1,647,325 — — — 209,357 13,017 (54,186 ) 1,815,513 Korea Electric Power Industrial Development Co., Ltd. 25,630 — — (1,966 ) 378 — 575 24,617 YTN Co., Ltd. 40,549 — — (270 ) 11,192 22 335 51,828 Gangwon Wind Power Co., Ltd. 11,443 — — (1,703 ) 814 — — 10,554 Hyundai Green Power Co., Ltd. 132,774 — — (8,888 ) (562 ) (1,346 ) (23 ) 121,955 Korea Power Exchange 269,122 — — — (10 ) — 616 269,728 Taebaek Wind Power Co., Ltd. 6,392 — — — 408 — — 6,800 Taebaek Guinemi Wind Power Co., Ltd. 3,087 — — — 270 — — 3,357 Pyeongchang Wind Power Co., Ltd. 5,027 — — — 384 — — 5,411 Daeryun Power Co., Ltd. 26,353 — — — (927 ) — — 25,426 Changjuk Wind Power Co., Ltd. 7,867 — — (449 ) 937 — — 8,355 KNH Solar Co., Ltd. 2,436 — — — (158 ) — — 2,278 SPC Power Corporation 69,912 — — (20,468 ) 5,311 10,291 — 65,046 Gemeng International Energy Co., Ltd. 679,708 — — (11,886 ) (154,930 ) 82,326 — 595,218 PT. Cirebon Electric Power 117,811 — — (18,253 ) 10,679 1,396 10,336 121,969 KNOC Nigerian East Oil Co., Ltd. — — — — (14 ) (938 ) 952 — KNOC Nigerian West Oil Co., Ltd. — — — — (15 ) (862 ) 877 — PT Wampu Electric Power 27,865 — — — 3,196 1,355 2,661 35,077 PT. Bayan Resources TBK 425,234 — — (68,666 ) 267,874 36,885 (38 ) 661,289 S-Power Co., Ltd. 110,292 — — — 12,437 57 — 122,786 Pioneer Gas Power Limited — — — — — — — — Eurasia Energy Holdings — — — — — — — — Xe-Pian Xe-Namnoy Power Co., Ltd. 64,570 — — — 19,306 8,565 — 92,441 Hadong Mineral Fiber Co., Ltd. — — — — — — — — PT. Mutiara Jawa 1,780 — — — 630 159 — 2,569 Samcheok Eco Materials Co., Ltd. — — — — — — — — Noeul Green Energy Co., Ltd. 4,197 — — — (389 ) — — 3,808 Goseong Green Power Co., Ltd. 2,186 259,840 — — (1,168 ) — — 260,858 Gangneung Eco Power Co., Ltd. 2,368 — — — (80 ) — — 2,288 Shin Pyeongtaek Power Co., Ltd. 69,591 — — — 23,476 — 7 93,074 Haeng Bok Do Si Photovoltaic Power Co., Ltd. 210 — — — 13 — — 223 Dongducheon Dream Power Co., Ltd. 80,637 — — — (6,439 ) — — 74,198 Jinbhuvish Power Generation Pvt. Ltd. — — — — — — — — Daejung Offshore Wind Power Co., Ltd. 2,165 — — — (461 ) — — 1,704 GS Donghae Electric Power Co., Ltd. 244,426 — — (15,640 ) 14,972 — 14 243,772 Daegu Photovoltaic Co., Ltd. 2,066 — — (206 ) 482 — — 2,342 Busan Green Energy Co., Ltd. 8,778 — — — (3,750 ) — 4 5,032 Gunsan Bio Energy Co., Ltd. — — — — — — — — Korea Electric Vehicle Charging Service 576 — — — (283 ) — 957 1,250 Hansuwon KNP Co., Ltd. 200 — — — 19 — — 219 Korea Electric Power Corporation Fund 41,926 — (3,090 ) — 9,065 82 — 47,983 Energy Infra Asset Management Co., Ltd. 938 — — — 128 — — 1,066 Daegu clean Energy Co., Ltd. 12 — — — — — — 12 YaksuESS Co., Ltd. 454 — — — 262 — — 716 Nepal Water & Energy Development Company Private Limited 42,677 19,960 — — (616 ) 4,312 — 66,333 Gwangyang Green Energy Co., Ltd. 926 24,800 — — (138 ) (122 ) — 25,466 PND Solar Co., Ltd. 1,149 — — — 80 — — 1,229 Hyundai Eco Energy Co., Ltd. 4,250 — — — 1,322 — — 5,572 YeongGwang Yaksu Wind Electric Co., Ltd. 312 — — — (79 ) — — 233 Green Energy Electricity Generation Co., Ltd. 25 — — — 1,688 — — 1,713 Korea Energy Solutions Co., Ltd. 197 — — — (74 ) — — 123 ITR Co., Ltd. 40 — — — (8 ) — — 32 2021 Investees Beginning Acquisitions Disposals Dividends Share of (loss) Other (loss) Others Ending In millions of won <Associates> Structure test network Co., Ltd. ￦ 27 — — — 279 — — 306 Namjeongsusang Solar Power Operation Co., Ltd. 103 — — — 258 — — 361 Indeck Niles Development, LLC 20,627 222,551 — — (13,160 ) 6,652 9,603 246,273 Indeck Niles Asset Management, LLC 101 — — — 567 — (557 ) 111 Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 7,326 — (188 ) — 399 — (399 ) 7,138 Suwon New Power Co., Ltd. 1,054 — — — (5 ) (14 ) — 1,035 KPGE Inc. 287 — — — 22 — — 309 Gwangbaek Solar Power Investment Co., Ltd. 4,682 — — — 124 — — 4,806 Go deok Clean Energy Co., Ltd. 960 3,730 — — (333 ) (55 ) — 4,302 SureDataLab Co., Ltd. 85 — — — 43 — — 128 SEP Co., Ltd. 14 — — — (7 ) — — 7 Hankook Electric Power Information Co., Ltd. 139 — — — 22 — — 161 Tronix Co., Ltd. 119 — — — (10 ) — — 109 O2&B Global Co., Ltd. 22 — — — 13 — — 35 Muan Sunshine Solar Power Plant Co., Ltd. 1,096 — — — 172 — — 1,268 Bigeum Resident Photovoltaic Power Co., Ltd. — — — — — — — — Jeju SolarOne Co., Ltd. 159 45 (206 ) — (1 ) — 3 — Goesan Solar Park Co., Ltd. 1,684 — — — 249 (6 ) — 1,927 Saemangeum Heemang Photovoltaic Co., Ltd. 11,022 — — — (784 ) — — 10,238 Bitgoel Eco Energy Co., Ltd. 29 4,611 — — (261 ) (23 ) — 4,356 Jeju Gimnyeong Wind Power Co., Ltd. 1,578 — — — (665 ) (2 ) — 911 Seoroseoro Sunny Power Plant Co., Ltd. 230 476 — — 15 — — 721 Muan Solar Park Co., Ltd. 4,180 220 — — 1,683 — — 6,083 YuDang Solar Co., Ltd. 360 — — — 205 — — 565 Anjwa Smart Farm & Solar City Co., Ltd. 5,510 141 — — 1,133 — — 6,784 Daewon Green Energy Co., Ltd. 3,910 — — — (33 ) — — 3,877 G.GURU Co., Ltd. — 493 — — (90 ) — — 403 UD4M Co., Ltd. — 75 — — 217 — (148 ) 144 Dongbu Highway Solar Co., Ltd. — — — — 74 — 191 265 Seobu Highway Solar Co., Ltd. — — — — 94 — 195 289 Korea Energy Data Co., Ltd. — 60 — — 2 — — 62 Gangneung Sacheon Fuel Cell Co., Ltd. — 1,950 — — (72 ) — — 1,878 Kosture Co., Ltd. — — — — — — — — Digital Innovation Growth Fund — 10,000 — — (110 ) — — 9,890 Taebaek Gadeoksan Wind Power Co., Ltd. — — — — 2,532 — 13,963 16,495 Chuncheon Green Energy Co., Ltd. — 3,400 — — (28 ) — — 3,372 Yeomsubong Wind Power Co., Ltd. — 95 — — — — — 95 Yeongyang Wind Power Corporation II — 7,965 — — — — — 7,965 Haeparang Energy Co., Ltd. — 2,241 — — — — — 2,241 Saemangeum Sebit Power Plant Co., Ltd. — 6,000 — — — — — 6,000 4,250,787 568,653 (3,484 ) (148,395 ) 417,123 161,751 (14,062 ) 5,232,373 <Joint ventures> KEPCO-Uhde Inc. 100 — — — (42 ) — — 58 Shuweihat Asia Power Investment B.V. 13,264 — — (2,467 ) 4,564 21,708 — 37,069 Shuweihat Asia Operation & Maintenance Company 1,057 — — (881 ) 1,101 103 — 1,380 Waterbury Lake Uranium L.P. 19,797 — — — — 1,793 — 21,590 ASM-BG Investicii AD 18,200 — — (2,703 ) 2,700 495 — 18,692 RES Technology AD 15,930 — — (676 ) 1,116 333 — 16,703 KV Holdings, Inc. 2,405 — — (901 ) 962 61 — 2,527 KEPCO SPC Power Corporation 201,663 — — (35,763 ) 37,073 (3,994 ) — 198,979 Gansu Datang Yumen Wind Power Co., Ltd. 6,530 — — — (619 ) 724 — 6,635 2021 Investees Beginning Acquisitions Disposals Dividends Share of (loss) Other (loss) Others Ending In millions of won <Joint ventures> Datang Chifeng Renewable Power Co., Ltd. ￦ 188,478 — — (14,191 ) 9,342 20,958 — 204,587 Datang KEPCO Chaoyang Renewable Power Co., Ltd. 42,530 — — (2,884 ) 1,562 3,009 — 44,217 Rabigh Electricity Company 97,157 — — (7,221 ) 17,896 35,846 — 143,678 Rabigh Operation & Maintenance Company Limited 3,813 — — (4,085 ) 3,489 854 — 4,071 Jamaica Public Service Company Limited 266,221 — — (4,578 ) 12,963 23,820 (3,777 ) 294,649 KW Nuclear Components Co., Ltd. 11,171 — — (833 ) 5,396 — — 15,734 Busan Shinho Solar Power Co., Ltd. 5,378 — — (352 ) 815 — — 5,841 Global Trade Of Power System Co., Ltd. 546 — — — 51 — — 597 Expressway Solar-light Power Generation Co., Ltd. 2,896 — — — 188 — — 3,084 Amman Asia Electric Power Company 161,253 — — (27,428 ) 18,487 26,367 — 178,679 KAPES, Inc. — — — — — — — — Honam Wind Power Co., Ltd. 3,887 — — — 154 — — 4,041 Jeongam Wind Power Co., Ltd. 4,620 5,808 (10,741 ) — 313 — — — Korea Power Engineering Service Co., Ltd. 5,362 — — — 206 — (153 ) 5,415 Chun-cheon Energy Co., Ltd. 27,518 — — — (1,622 ) — — 25,896 Yeonggwangbaeksu Wind Power Co., Ltd. 3,124 — — — (396 ) — — 2,728 Nghi Son 2 Power LLC — — — — — — — — Kelar S.A. 71,449 — — — 2,121 6,416 6,709 86,695 PT. Tanjung Power Indonesia 33,063 — — — 5,027 9,029 (573 ) 46,546 Incheon New Power Co., Ltd. — — — — — — — — Seokmun Energy Co., Ltd. 14,814 — — — (972 ) — — 13,842 Daehan Wind Power PSC — — — — 3,791 1,363 — 5,154 Barakah One Company — — — — — — — — Nawah Energy Company 270 — — — — 24 — 294 Momentum 565 — — (569 ) 368 4 — 368 Daegu Green Power Co., Ltd. 23,045 — — — 982 — 27 24,054 Yeonggwang Wind Power Co., Ltd. 17,256 — — — 390 — — 17,646 Chester Solar IV SpA 1,064 — — — (1,083 ) (36 ) 55 — Chester Solar V SpA 277 — — — (269 ) 2 15 25 Diego de Almagro Solar SpA 1,490 — — — (1,095 ) (123 ) 90 362 South Jamaica Power Company Limited 31,897 — — — 2,515 2,949 (1 ) 37,360 Daesan Green Energy Co., Ltd. 22,552 — — — (1,308 ) — — 21,244 RE Holiday Holdings LLC 68,809 — — (9,577 ) 6,299 7,636 — 73,167 RE Pioneer Holdings LLC 49,639 — — (14,199 ) 5,556 6,019 — 47,015 RE Barren Ridge 1 Holdings LLC 4,466 — — (1,365 ) (3,162 ) 1,944 — 1,883 RE Astoria 2 LandCo LLC 5,230 — — (337 ) 619 486 — 5,998 RE Barren Ridge LandCo LLC 1,847 — — (140 ) 240 173 — 2,120 Laurel SpA 1,092 — — — (798 ) (71 ) 67 290 KIAMCO KOWEPO Bannerton Hold Co Pty Ltd 4,129 — — — (111 ) (393 ) — 3,625 Chile Solar JV SpA 34,883 — — — 831 (3,257 ) — 32,457 Cheong-Song Noraesan Wind Power Co., Ltd. 3,453 — — — 653 — — 4,106 Chester Solar I SpA 1,621 — — — (430 ) (195 ) 124 1,120 Solar Philippines Calatagan Corporation 49,017 — — (5,961 ) 5,961 9,214 — 58,231 Saemangeum Solar Power Co., Ltd. 24,292 1 — — (354 ) — — 23,939 Chungsongmeon BongSan wind power Co., Ltd. 4,124 — — — (316 ) — — 3,808 Jaeun Resident Wind Power Plant Co., Ltd. 2,195 — — — (237 ) — — 1,958 DE Energia SpA 8,187 — — — — 734 — 8,921 Dangjin Eco Power Co., Ltd. 25,523 — — — 274 312 — 26,109 Haemodum Solar Co., Ltd. 3,065 — — — 16 — — 3,081 Yangyang Wind Power Co., Ltd. 10,485 1,200 — — (488 ) (6 ) — 11,191 Horus Solar, S.A. De C.V. 3,394 — — — 2,396 52 — 5,842 Recursos Solares PV De Mexico II, S.A. DE C.V. 3,660 — — — 766 110 — 4,536 2021 Investees Beginning Acquisitions Disposals Dividends Share of (loss) Other (loss) Others Ending In millions of won <Joint ventures> Sunmex Renovables, S.A. De C.V. ￦ 240 1,371 — — (49 ) 48 — 1,610 Stavro Holding II A.B. 9,277 8,684 — — (55 ) (271 ) (8 ) 17,627 Solaseado Solar Power Co., Ltd. 9,915 — — — (24 ) — — 9,891 Yeongam Solar Power Co., Ltd. 6,042 — — — 796 — — 6,838 Samsu Wind Power Co., Ltd. 2,607 — — — 221 — — 2,828 Pulau Indah Power Plant Sdn. Bhd. 11,204 12,264 — — (519 ) (850 ) — 22,099 Sam-Yang Photovoltaic Power Co., Ltd. 5,535 — — — (542 ) — — 4,993 NH-Amundi Global Infrastructure Investment Private Investment Trust 21 22,242 — (969 ) (1,727 ) 1,910 — — 21,456 Shin-han BNPP Private Investment Trust for East-West Sunlight Dream 16,129 — — — 159 — — 16,288 PT Barito Wahana Tenaga 63,029 140 — — 4,194 14,232 — 81,595 Cheongna Energy Co., Ltd. 4,940 — — — 6,258 — — 11,198 Naepo Green Energy Co., Ltd. — — — — — — — — Dayone Energy Co., Ltd. — — — — — — — — OneEnergy Asia Limited 56,654 20,262 — — (1,138 ) 3,922 — 79,700 KAS Investment I LLC 23,437 — — — (6,876 ) (1,288 ) — 15,273 KAS Investment II LLC 23,343 — — — (6,515 ) (1,615 ) — 15,213 Energyco Co., Ltd. 1,659 — — — (60 ) (64 ) — 1,535 CAES, LLC 17,626 — — (1,009 ) (331 ) 850 1,299 18,435 Hapcheon Floating Photovoltaic Power Plant Inc. 1,890 5,622 — — (541 ) — — 6,971 Busan Industrial Solar Power Co., Ltd. 510 — — — 102 — — 612 Bitsolar Energy Co., Ltd. 352 — — — — — — 352 Pulau Indah O&M Sdn. Bhd. — — — — — — — — Guadalupe Solar SpA — 1,397 — — (672 ) (66 ) — 659 Omisan Wind Power Co., Ltd. — 10,752 — — (119 ) — — 10,633 Foresight Iberian Solar Group Holding, S.L. — — — — 72 — 9,671 9,743 Yeongwol Eco Wind Co., Ltd. — 3,089 — — 122 (15 ) — 3,196 Gurae Resident Power Co., Ltd. — 386 — — 12 (3 ) — 395 Cheongju Eco Park Co., Ltd. — 5,858 — — (393 ) — — 5,465 Enel X Midland Photovoltaic, LLC — 1,695 — — (7 ) — — 1,688 Geumsungsan Wind Power Co., Ltd. — 6,531 — — (478 ) — — 6,053 KEPCO KPS Carabao Corp. — 93 — — 293 — — 386 Prime Swedish Holding AB — 8,155 — — 22 1,060 6,204 15,441 Taebaek Gadeoksan Wind Power Co., Ltd. 13,362 — — — 762 — (14,124 ) — Goheung New Energy Co., Ltd. — 12,959 — — (1,251 ) — — 11,708 Gunsan Land Solar Co., Ltd. — 19,091 — — 324 (98 ) — 19,317 CapMan Lynx SCA, SICAR — 9,601 — — 375 — — 9,976 International Offshore Power Transmission Holding Company Limited — — — — — — — — 1,919,746 134,959 (11,710 ) (139,847 ) 139,933 190,305 5,625 2,239,011 ￦ 6,170,533 703,612 (15,194 ) (288,242 ) 557,056 352,056 (8,437 ) 7,471,384 2022 Investees Beginning Acquisitions Disposals Dividends Share of (loss) Other (loss) Others Ending In millions of won <Associates> Korea Gas Corporation ￦ 1,815,513 — — (51,559 ) 305,638 7,746 7,958 2,085,296 Korea Electric Power Industrial Development Co., Ltd. 24,617 — — (1,872 ) 3,807 — 4,526 31,078 YTN Co., Ltd. 51,828 — — (450 ) 1,565 (34 ) 2,118 55,027 Gangwon Wind Power Co., Ltd. 10,554 — — (1,420 ) 3,024 — — 12,158 Hyundai Green Power Co., Ltd. 121,955 — — (4,008 ) 1,770 1,345 (1,271 ) 119,791 Korea Power Exchange 269,728 — — — 772 — 4,626 275,126 Taebaek Wind Power Co., Ltd. 6,800 7,684 — (825 ) 842 — — 14,501 Taebaek Guinemi Wind Power Co., Ltd. 3,357 9,217 — — 475 — — 13,049 Pyeongchang Wind Power Co., Ltd. 5,411 5,454 — (100 ) 3,695 — (14,460 ) — Daeryun Power Co., Ltd. 25,426 — — — 429 1 871 26,727 Changjuk Wind Power Co., Ltd. 8,355 11,862 — (1,350 ) 817 — (19,684 ) — KNH Solar Co., Ltd. 2,278 — — — 606 (1 ) — 2,883 SPC Power Corporation 65,046 — — (2,694 ) 1,188 7,330 (2 ) 70,868 Gemeng International Energy Co., Ltd. 595,218 — — — (233 ) (16,164 ) — 578,821 PT. Cirebon Electric Power 121,969 — — (10,659 ) 14,776 704 8,324 135,114 KNOC Nigerian East Oil Co., Ltd. — — — — (11 ) (787 ) 798 — KNOC Nigerian West Oil Co., Ltd. — — — — (10 ) (724 ) 734 — PT Wampu Electric Power 35,077 — — (5,551 ) 5,848 54 2,315 37,743 PT. Bayan Resources TBK 661,289 — — (515,139 ) 531,528 7,041 — 684,719 S-Power Co., Ltd. 122,786 — — — 18,342 — — 141,128 Pioneer Gas Power Limited — — — — — — — — Eurasia Energy Holdings — — — — — — — — Xe-Pian Xe-Namnoy Power Co., Ltd. 92,441 — — — 15,582 7,561 — 115,584 PT. Mutiara Jawa 2,569 — — — 1,197 (169 ) — 3,597 Samcheok Eco Materials Co., Ltd. — — — — — — — — Noeul Green Energy Co., Ltd. 3,808 — — — (3,824 ) — 16 — Goseong Green Power Co., Ltd. 260,858 — — — 27,992 — 43 288,893 Gangneung Eco Power Co., Ltd. 2,288 — — — (2,288 ) — — — Shin Pyeongtaek Power Co., Ltd. 93,074 — — — 40,713 — 36 133,823 Haeng Bok Do Si Photovoltaic Power Co., Ltd. 223 — — — 55 — — 278 Dongducheon Dream Power Co., Ltd. 74,198 — — — 15,086 — 16 89,300 Jinbhuvish Power Generation Pvt. Ltd. — — — — — — — — Daejung Offshore Wind Power Co., Ltd. 1,704 — — — (149 ) — — 1,555 GS Donghae Electric Power Co., Ltd. 243,772 — — — 15,717 — 656 260,145 Daegu Photovoltaic Co., Ltd. 2,342 — — (268 ) 775 — — 2,849 Busan Green Energy Co., Ltd. 5,032 — — — (667 ) — 30 4,395 Gunsan Bio Energy Co., Ltd. — — — — — — — — Korea Electric Vehicle Charging Service 1,250 — (1,293 ) — 43 — — — Hansuwon KNP Co., Ltd. 219 — — — 61 — — 280 Korea Electric Power Corporation Fund 47,983 — (25,297 ) — 7,966 (1,810 ) — 28,842 Energy Infra Asset Management Co., Ltd. 1,066 — — — 118 — — 1,184 Daegu clean Energy Co., Ltd. 12 — — — — — — 12 YaksuESS Co., Ltd. 716 — — — (230 ) — — 486 Nepal Water & Energy Development Company Private Limited 66,333 — — — (923 ) 4,530 — 69,940 Gwangyang Green Energy Co., Ltd. 25,466 — — — (422 ) — — 25,044 PND solar Co., Ltd. 1,229 — — — 174 — — 1,403 Hyundai Eco Energy Co., Ltd. 5,572 — — — 2,058 1 — 7,631 YeongGwang Yaksu Wind Electric Co., Ltd. 233 — — — 143 — (220 ) 156 Green Energy Electricity Generation Co., Ltd. 1,713 — — — (142 ) — — 1,571 Korea Energy Solutions Co., Ltd. 123 — — — (30 ) — — 93 ITR Co., Ltd. 32 — — — (32 ) — — — Structure test network Co., Ltd. 306 — — — 60 — — 366 2022 Investees Beginning Acquisitions Disposals Dividends Share of (loss) Other (loss) Others Ending In millions of won <Associates> Namjeongsusang Solar Power Operation Co., Ltd. ￦ 361 — — — 12 — — 373 Indeck Niles Development, LLC 246,273 — (4,289 ) — 21,975 21,840 16,239 302,038 Indeck Niles Asset Management, LLC 111 — — (497 ) 472 — 8 94 Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 7,138 — (202 ) (392 ) 389 (1 ) — 6,932 Suwon New Power Co., Ltd. 1,035 — — — (116 ) — — 919 KPGE Inc. 309 — (317 ) — 8 — — — Gwangbaek Solar Power Investment Co., Ltd. 4,806 — — — 327 — — 5,133 Go deok Clean Energy Co., Ltd. 4,302 — — — 118 — — 4,420 SureDataLab Co., Ltd. 128 — — — 49 — — 177 SEP Co., Ltd. 7 — — — (7 ) — — — Hankook Electric Power Information Co., Ltd. 161 — — — 121 — (62 ) 220 Tronix Co., Ltd. 109 — — — (37 ) — (6 ) 66 O2&B Global Co., Ltd. 35 — — — 1 — — 36 Muan Sunshine Solar Power Plant Co., Ltd. 1,268 — — — 1,294 — — 2,562 Bigeum Resident Photovoltaic Power Co., Ltd. — — — — — — — — Goesan Solar Park Co., Ltd. 1,927 — — — 664 — — 2,591 Saemangeum Heemang Photovoltaic Co., Ltd. 10,238 — — — 2,772 — — 13,010 Bitgoel Eco Energy Co., Ltd. 4,356 3,240 — — 1,355 — — 8,951 Jeju Gimnyeong Wind Power Co., Ltd. 911 — — — (39 ) — — 872 Seoroseoro Sunny Power Plant Co., Ltd. 721 — — — 138 — — 859 Muan Solar park Co., Ltd. 6,083 — — (600 ) 2,377 (22 ) — 7,838 YuDang Solar Co., Ltd. 565 — — (160 ) 181 — — 586 Anjwa Smart Farm & Solar City Co., Ltd. 6,784 — — — 1,878 — — 8,662 Daewon Green Energy Co., Ltd. 3,877 — — — 608 — — 4,485 G.GURU Co., Ltd. 403 — — — (103 ) — — 300 UD4M Co., Ltd. 144 — — — 17 — — 161 Dongbu Highway Solar Co., Ltd. 265 — — — 87 — — 352 Seobu Highway Solar Co., Ltd. 289 — — — 27 — — 316 Korea Energy Data Co., Ltd. 62 — — — — — — 62 Gangneung Sacheon Fuel Cell Co., Ltd. 1,878 3,745 — — (1,310 ) (36 ) — 4,277 KOSTURE Co., Ltd. — 1 — — — — — 1 Digital Innovation Growth Fund 9,890 — — — (204 ) — (9,686 ) — Taebaek Gadeoksan Wind Power Co., Ltd. 16,495 — — (1,784 ) 5,644 — (315 ) 20,040 Chuncheon Green Energy Co., Ltd. 3,372 6,140 — — (357 ) — — 9,155 Yeomsubong Wind Power Co., Ltd. 95 — — — (40 ) — 7 62 Yeongyang Wind Power Corporation II 7,965 — — — (504 ) — — 7,461 Haeparang Energy Co., Ltd. 2,241 — — — (53 ) — — 2,188 Saemangeum Sebit Power Plant Co., Ltd. 6,000 7,788 — — 4,855 — 4,556 23,199 Boulder Solar III, LLC — 715 — — — — 29 744 PlatformN. Co., Ltd. — 105 — — (21 ) — — 84 PT. Cirebon Energi Prasarana — 24,052 — — 35,315 6,963 2,705 69,035 Green Radiation Co., Ltd. — — — — (9 ) — 20 11 Future Convergence Technology Laboratory. Co., Ltd. — 76 — — (26 ) — — 50 SC E&G. Co,. Ltd. — 90 — — 124 — — 214 Wang San Engineering. Co,. Ltd. — 81 — — 85 — — 166 ACE — 20 — — — — — 20 Environment and Energy Co., Ltd. — 11 — — (1 ) — — 10 Santiago Solar Power SpA — 13,853 — — (379 ) (100 ) (1 ) 13,373 Yanggu Floating Photovoltaic Power Plant Inc. — 903 — — — — — 903 5,232,373 95,037 (31,398 ) (599,328 ) 1,091,588 45,268 10,924 5,844,464 2022 Investees Beginning Acquisitions Disposals Dividends Share of (loss) Other (loss) Others Ending In millions of won <Joint ventures> KEPCO-Uhde Inc. ￦ 58 — — — (43 ) — 2 17 Shuweihat Asia Power Investment B.V. 37,069 — — (3,545 ) (1,303 ) 34,231 — 66,452 Shuweihat Asia Operation & Maintenance Company 1,380 — — (995 ) 1,154 92 — 1,631 Waterbury Lake Uranium L.P. 21,590 — — — 1 159 — 21,750 ASM-BG Investicii AD 18,692 — (6,255 ) (2,395 ) 2,979 1,534 — 14,555 RES Technology AD 16,703 — (3,673 ) (333 ) 1,427 1,009 — 15,133 KV Holdings, Inc. 2,527 — — (394 ) 7,747 (221 ) — 9,659 KEPCO SPC Power Corporation 198,979 — — (34,280 ) 27,591 (12,696 ) — 179,594 Gansu Datang Yumen Wind Power Co., Ltd. 6,635 — — — (464 ) (147 ) — 6,024 Datang Chifeng Renewable Power Co., Ltd. 204,587 — — (8,732 ) 2,849 (6,722 ) — 191,982 Datang KEPCO Chaoyang Renewable Power Co., Ltd. 44,217 — — (2,694 ) 3,936 (1,061 ) — 44,398 Rabigh Electricity Company 143,678 — — (11,447 ) 31,523 50,853 — 214,607 Rabigh Operation & Maintenance Company Limited 4,071 — — (2,735 ) 3,866 (89 ) — 5,113 Jamaica Public Service Company Limited 294,649 — — (7,752 ) 28,541 19,494 (3,525 ) 331,407 KW Nuclear Components Co., Ltd. 15,734 — — (833 ) 2,189 — — 17,090 Busan Shinho Solar Power Co., Ltd. 5,841 — — (478 ) 1,356 — — 6,719 Global Trade Of Power System Co., Ltd. 597 — — — 101 — — 698 Expressway Solar-light Power Generation Co., Ltd. 3,084 — — — 1,670 — — 4,754 Amman Asia Electric Power Company 178,679 — — (19,350 ) 23,442 37,483 — 220,254 KAPES, Inc. — — — — — — — — Honam Wind Power Co., Ltd. 4,041 — — (174 ) 952 — — 4,819 Korea Power Engineering Service Co., Ltd. 5,415 — — (86 ) 145 — 69 5,543 Chun-cheon Energy Co., Ltd. 25,896 — — — 6,148 — — 32,044 Yeonggwangbaeksu Wind Power Co., Ltd. 2,728 — — — 423 — — 3,151 Nghi Son 2 Power LLC — 172,480 — — 51,218 185,141 — 408,839 Kelar S.A. 86,695 — — — 3,695 21,241 5,506 117,137 PT. Tanjung Power Indonesia 46,546 30,147 — (6,104 ) 4,645 18,323 (650 ) 92,907 Incheon New Power Co., Ltd. — — — — 198 — — 198 Seokmun Energy Co., Ltd. 13,842 — — — 3,494 — — 17,336 Daehan Wind Power PSC 5,154 — — — 2,446 6,323 — 13,923 Barakah One Company — — — — — — — — Nawah Energy Company 294 — — — 1 20 — 315 Momentum 368 — — (369 ) 345 1 — 345 Daegu Green Power Co., Ltd. 24,054 — — — 5,079 — 227 29,360 Yeonggwang Wind Power Co., Ltd. 17,646 — — — 3,067 — — 20,713 Chester Solar IV SpA — — — — 202 (17 ) (4 ) 181 Chester Solar V SpA 25 — — — 129 3 (1 ) 156 Diego de Almagro Solar SpA 362 — — — 154 2 22 540 South Jamaica Power Company Limited 37,360 — — — 6,625 2,452 — 46,437 Daesan Green Energy Co., Ltd. 21,244 — — — (2,030 ) — 4 19,218 RE Holiday Holdings LLC 73,167 — — (2,288 ) 2,526 11,965 — 85,370 RE Pioneer Holdings LLC 47,015 — — (1,337 ) (275 ) 9,769 — 55,172 RE Barren Ridge 1 Holdings LLC 1,883 — — (1,625 ) (2,886 ) 5,978 — 3,350 RE Astoria 2 LandCo LLC 5,998 — — (388 ) 571 418 — 6,599 RE Barren Ridge LandCo LLC 2,120 — — (160 ) 225 148 — 2,333 Laurel SpA 290 — — — 245 3 16 554 KIAMCO KOWEPO Bannerton Hold Co Pty Ltd 3,625 — — — 26 — — 3,651 Chile Solar JV SpA 32,457 — (24,894 ) — 159 2,097 — 9,819 Cheong-Song Noraesan Wind Power Co., Ltd. 4,106 — — (672 ) 832 — (3 ) 4,263 Chester Solar I SpA 1,120 — — — 120 (1 ) 75 1,314 Solar Philippines Calatagan Corporation 58,231 — — (1,710 ) 6,081 (5,700 ) — 56,902 Saemangeum Solar Power Co., Ltd. 23,939 — — — (388 ) — — 23,551 Chungsongmeon BongSan wind power Co., Ltd. 3,808 — — — (338 ) — — 3,470 Jaeun Resident Wind Power Plant Co., Ltd. 1,958 — — — 278 — — 2,236 DE Energia SpA 8,921 — — — — 615 — 9,536 2022 Investees Beginning Acquisitions Disposals Dividends Share of (loss) Other (loss) Others Ending In millions of won <Joint ventures> Dangjin Eco Power Co., Ltd. ￦ 26,109 — — — 233 513 4 26,859 Haemodum Solar Co., Ltd. 3,081 — — — 286 — — 3,367 Yangyang Wind Power Co., Ltd. 11,191 — — — (327 ) — — 10,864 HORUS SOLAR, S.A. DE C.V. 5,842 — — — 841 293 — 6,976 RECURSOS SOLARES PV DE MEXICO II, S.A. DE C.V. 4,536 — — — 68 295 — 4,899 SUNMEX RENOVABLES, S.A. DE C.V. 1,610 — — — (151 ) 198 — 1,657 Stavro Holding II A.B. 17,627 952 — — 157 (1,687 ) 122 17,171 Solaseado Solar Power Co., Ltd. 9,891 — — — 6,342 — — 16,233 Yeongam Solar Power Co., Ltd. 6,838 — — — 3,041 — — 9,879 Samsu Wind Power Co., Ltd. 2,828 — — — 377 — — 3,205 Pulau Indah Power Plant Sdn. Bhd. 22,099 — — — 1,681 3,034 — 26,814 Sam-Yang Photovoltaic Power Co., Ltd. 4,993 — — — (123 ) — (4,870 ) — NH-Amundi Global Infrastructure Investment Private Investment Trust 21 21,456 485 (406 ) (1,415 ) 1,603 — — 21,723 Shin-han BNPP Private Investment Trust for East-West Sunlight Dream 16,288 — (687 ) — (14 ) — — 15,587 PT Barito Wahana Tenaga 81,595 39 — — 13,352 42,061 — 137,047 Cheongna Energy Co., Ltd. 11,198 — — — (440 ) — — 10,758 Naepo Green Energy Co., Ltd. — — — — — — — — Dayone Energy Co., Ltd. — — — — — — — — OneEnergy Asia Limited 79,700 39,033 — — (18,294 ) 71,779 — 172,218 KAS Investment I LLC 15,273 — — — 2,426 548 — 18,247 KAS Investment II LLC 15,213 — — — 2,082 878 — 18,173 Energyco Co., Ltd. 1,535 — — — 655 — — 2,190 CAES, LLC 18,435 — — (217 ) (198 ) 1,756 1,029 20,805 Hapcheon Floating Photovoltaic Power Plant Inc. 6,971 — — — 1,500 — — 8,471 Busan Industrial Solar Power Co., Ltd. 612 — — — 556 — — 1,168 Bitsolar Energy Co., Ltd. 352 — — — — — — 352 Pulau Indah O&M Sdn. Bhd. — — — — — — — — Guadalupe Solar SpA 659 — — — 221 33 — 913 Omisan Wind Power Co., Ltd. 10,633 — — — (222 ) — — 10,411 Foresight Iberian Solar Group Holding, S.L. 9,743 1,781 — — (1,016 ) 3 54 10,565 Yeongwol Eco Wind Co., Ltd. 3,196 — — — (41 ) — — 3,155 Gurae Resident Power Co., Ltd. 395 — — — (4 ) — — 391 Cheongju Eco Park Co., Ltd. 5,465 — — — 5,025 — — 10,490 Enel X Midland Photovoltaic, LLC 1,688 — — — 168 — — 1,856 Geumsungsan Wind Power Co., Ltd. 6,053 — — — (2,560 ) — — 3,493 KEPCO KPS CARABAO Corp. 386 — — (104 ) (105 ) — — 177 Prime Swedish Holding AB 15,441 20,896 — — (261 ) — 169 36,245 Goheung New Energy Co., Ltd. 11,708 — — — 124 — — 11,832 Gunsan Land Solar Co., Ltd. 19,317 — — — 8,220 7 — 27,544 CapMan Lynx SCA, SICAR 9,976 — — — (10,195 ) 5,173 (4,954 ) — International Offshore Power Transmission Holding Company Limited — — — — — — — — Pyeongchang Wind Power Co., Ltd. — — — — — — 14,464 14,464 Eumseong Eco Park Co., Ltd. — 5,741 — — (184 ) — — 5,557 Songsan Green Energy Co., Ltd. — 1,400 — — (13 ) — — 1,387 2022 Investees Beginning Acquisitions Disposals Dividends Share of (loss) Other (loss) Others Ending In millions of won <Joint ventures> Changwon Nu-ri Energy Co., Ltd. ￦ — 500 — — (3 ) — — 497 Hasami Wind Farm Corporation — 1,596 — — (7 ) — — 1,589 PungBack Wind Farm Corporation — 7,884 — — (1,141 ) — — 6,743 Trumbull Asset Management, LLC — — — — 252 (1 ) (5 ) 246 S-Power Chile SpA — 127 — — — — — 127 Seungmun Green Energy — 8,973 — — 120 (39 ) — 9,054 Seobusambo highway photovoltaics Co., Ltd. — (1 ) — — — — 3,067 3,066 2,239,011 292,033 (35,915 ) (112,612 ) 246,705 507,544 10,818 3,147,584 ￦ 7,471,384 387,070 (67,313 ) (711,940 ) 1,338,293 552,812 21,742 8,992,048
Summary of Financial Information of Associates and Joint Ventures	(4) Summary of financial information of associates and joint ventures as of and for the years ended December 31, 2021 and 2022 are as follows: 2022 Investees Total assets Total liabilities Sales Profit (loss) for the year In millions of won <Associates> Korea Gas Corporation (*1) ￦ 62,424,983 52,014,243 51,724,287 1,497,008 Korea Electric Power Industrial Development Co., Ltd. 148,112 40,946 336,333 15,434 YTN Co., Ltd. 364,115 107,324 152,187 7,250 Gangwon Wind Power Co., Ltd. 86,758 6,029 40,130 20,163 Hyundai Green Power Co., Ltd. 773,998 360,926 105,374 5,010 Korea Power Exchange 311,691 36,564 118,501 1,036 Taebaek Wind Power Co., Ltd. 27,562 3,394 7,565 551 Taebaek Guinemi Wind Power Co., Ltd. 44,036 28,709 6,793 1,906 Daeryun Power Co., Ltd. 1,201,510 799,370 472,211 4,999 KNH Solar Co., Ltd. 13,584 2,905 4,348 2,173 SPC Power Corporation 254,951 26,417 80,630 25,614 Gemeng International Energy Co., Ltd. 7,796,180 5,460,183 3,183,398 11,637 PT. Cirebon Electric Power 691,311 199,987 287,261 53,730 KNOC Nigerian East Oil Co., Ltd. 26,491 109,974 — (72 ) KNOC Nigerian West Oil Co., Ltd. 28,537 105,292 — (72 ) PT Wampu Electric Power 209,815 127,764 21,773 12,713 PT. Bayan Resources TBK 4,994,538 2,518,129 6,076,844 3,042,123 S-Power 937,067 646,411 1,091,425 37,104 Pioneer Gas Power Limited 271,340 477,127 — (46,290 ) Eurasia Energy Holdings 648 1,156 — — Xe-Pian Xe-Namnoy 1,371,292 904,907 174,693 61,020 PT. Mutiara Jawa 26,024 13,622 15,421 4,912 Samcheok Eco Materials Co., Ltd. 24,952 1,609 11,907 (1,127 ) Noeul Green Energy Co., Ltd. 82,611 101,472 23,493 (31,970 ) Goseong Green Power Co., Ltd. 5,518,258 4,516,607 1,999,825 26,981 Gangneung Eco Power Co., Ltd. 4,907,872 4,900,408 435,755 (142,387 ) Shin Pyeongtaek Power Co., Ltd. 1,203,406 839,568 957,062 100,554 Haeng Bok Do Si Photovoltaic Power Co., Ltd. 1,788 802 558 200 Dongducheon Dream Power Co., Ltd. 1,521,089 1,219,018 2,240,175 43,072 Jinbhuvish Power Generation Pvt. Ltd. 60,477 12,489 — — Daejung Offshore Wind Power Co., Ltd. 5,350 2,013 — (228 ) GS Donghae Electric Power Co., Ltd. 2,130,287 1,365,156 1,053,112 46,226 Daegu Photovoltaic Co., Ltd. 13,254 3,431 4,755 2,914 Busan Green Energy Co., Ltd. 168,588 153,432 72,290 (7,409 ) Gunsan Bio Energy Co., Ltd. 8,397 29,524 — (649 ) Hansuwon KNP Co., Ltd. 1,887 368 2,149 210 Korea Electric Power Corporation Fund 29,530 130 8,034 7,854 Energy Infra Asset Management Co., Ltd. 12,874 918 4,954 1,354 Daegu clean Energy Co., Ltd. 368 324 — (1 ) YaksuESS Co., Ltd. 5,984 4,314 851 (146 ) Nepal Water & Energy Development Company Private Limited 241,061 141,199 70,923 (1,364 ) Gwangyang Green Energy Co., Ltd. 170,390 45,260 — (1,923 ) PND solar Co., Ltd. 36,174 31,868 5,940 217 Hyundai Eco Energy Co., Ltd. 181,566 142,533 29,209 10,270 YeongGwang Yaksu Wind Electric Co., Ltd. 40,712 39,924 6,628 1,480 Green Energy Electricity Generation Co., Ltd. 75,033 72,300 1,404 (488 ) Korea Energy Solutions Co., Ltd. 843 377 437 (185 ) ITR Co., Ltd. 446 472 188 (190 ) Structure test network Co., Ltd. 1,948 383 732 202 Namjeongsusang Solar Power Operation Co., Ltd. 55,616 53,261 7,724 83 Indeck Niles Development, LLC 1,178,303 762,139 302,041 (22,541 ) Indeck Niles Asset Management, LLC 299 16 1,863 1,136 Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 14,356 210 826 796 Suwon New Power Co., Ltd. 2,142 164 — 11 2022 Investees Total assets Total liabilities Sales Profit (loss) for the year In millions of won <Associates> Gwangbaek Solar Power Investment Co., Ltd. ￦ 307,864 296,915 10,270 743 Go deok Clean Energy Co., Ltd. 71,431 60,382 — (1,101 ) SureDataLab Co., Ltd. 879 140 938 203 SEP Co., Ltd. 38 103 — (98 ) Hankook Electric Power Information Co., Ltd. 2,334 997 1,797 392 Tronix Co., Ltd. 2,880 2,354 1,938 (226 ) O2&B Global Co., Ltd. 419 238 220 5 Muan Sunshine Solar Power Plant Co., Ltd. 142,911 132,573 19,591 6,467 Bigeum Resident Photovoltaic Power Co., Ltd. 107,690 109,229 — (537 ) Goesan Solar Park Co., Ltd. 52,235 43,299 7,642 2,292 Saemangeum Heemang Photovoltaic Co., Ltd. 160,695 125,635 29,543 6,481 Bitgoel Eco Energy Co., Ltd. 85,236 66,987 10,054 3,229 Jeju Gimnyeong Wind Power Co., Ltd. 63,471 60,564 12,231 (130 ) Seoroseoro Sunny Power Plant Co., Ltd. 7,015 5,045 1,157 247 Muan Solar park Co., Ltd. 225,894 188,329 36,081 11,339 YuDang Solar Co., Ltd. 22,073 19,144 3,997 957 Anjwa Smart Farm & Solar City Co., Ltd. 278,806 239,581 42,477 9,672 Daewon Green Energy Co., Ltd. 141,974 124,460 45,095 4,037 G.GURU Co., Ltd. 1,228 12 478 (423 ) UD4M Co., Ltd. 1,322 197 1,109 59 Dongbu Highway Solar Co., Ltd. 17,935 16,426 2,901 439 Seobu Highway Solar Co., Ltd. 18,236 16,655 3,052 138 Korea Energy Data Co., Ltd. 339 128 308 5 Gangneung Sacheon Fuel Cell Co., Ltd. 108,688 98,470 — (2,720 ) KOSTURE Co., Ltd. 180 24 293 32 Taebaek Gadeoksan Wind Power Co., Ltd. 197,944 139,004 31,534 19,406 Chuncheon Green Energy Co., Ltd. 159,151 138,925 — (858 ) Yeomsubong Wind Power Co., Ltd. 4,369 2,829 — (859 ) Yeongyang Wind Power Corporation II 104,821 86,984 — (1,678 ) Haeparang Energy Co., Ltd. 19,394 10,721 — (211 ) Saemangeum Sebit Power Plant Co., Ltd. 167,822 131,383 23,159 7,742 Boulder Solar III, LLC 1,896 — — — PlatformN. Co., Ltd. 379 94 486 (70 ) PT. Cirebon Energi Prasarana 3,361,288 2,670,941 319,986 36,451 Green Radiation Co., Ltd. 111 34 89 (93 ) Future Convergence Technology Laboratory. Co., Ltd. 551 302 9 (130 ) SC E&G. Co,. Ltd. 1,199 131 1,048 609 Wang San Engineering. Co,. Ltd. 1,275 447 754 499 ACE 100 — — — Environment and Energy Co., Ltd. 93 — — (7 ) Santiago Solar Power SpA 56,138 29,390 — (2,943 ) Yanggu Floating Photovoltaic Power Plant Inc. 3,115 — — — <Joint ventures> KEPCO-Uhde Inc. 48 15 — (84 ) Shuweihat Asia Power Investment B.V. 135,646 29 — (2,660 ) Shuweihat Asia Operation & Maintenance Company 3,037 71 3,013 2,099 Waterbury Lake Uranium L.P. 66,706 117 — — ASM-BG 72,999 43,889 16,056 6,230 RES Technology AD 62,345 32,079 11,205 3,018 KV Holdings, Inc. 24,149 1 1 353 KEPCO SPC Power Corporation 267,904 29,082 253,145 44,751 Gansu Datang Yumen Wind Power Co., Ltd. 67,651 52,592 10,048 (1,161 ) Datang Chifeng Renewable Power Co., Ltd. 835,331 355,377 140,343 42,889 Datang KEPCO Chaoyang Renewable Power Co., Ltd. 168,680 57,685 29,459 4,919 2022 Investees Total assets Total liabilities Sales Profit (loss) for the year In millions of won <Joint ventures> Rabigh Electricity Company ￦ 2,520,946 1,855,836 322,108 65,550 Rabigh Operation & Maintenance Company Limited 23,664 10,882 32,572 9,176 Jamaica Public Service Company Limited 2,310,611 1,515,361 1,499,897 69,458 KW Nuclear Components Co., Ltd. 40,381 2,013 16,968 6,755 Busan Shinho Solar Power Co., Ltd. 36,868 9,991 10,543 5,424 Global Trade Of Power System Co., Ltd. 5,628 3,222 8,434 351 Expressway Solar-light Power Generation Co., Ltd. 14,248 4,740 3,711 1,654 Amman Asia Electric Power Company 759,885 392,795 28,665 39,090 KAPES, Inc. 82,943 45,068 20,006 3,797 Honam Wind Power Co., Ltd. 34,028 17,522 8,781 3,283 Korea Power Engineering Service Co., Ltd. 20,931 1,817 9,176 500 Chun-cheon Energy Co., Ltd. 629,202 521,212 585,223 19,940 Yeonggwangbaeksu Wind Power Co., Ltd. 80,042 59,070 14,150 2,764 Nghi Son 2 Power LLC 3,652,801 2,835,123 589,023 102,436 Kelar S.A. 689,802 514,085 107,577 943 PT. Tanjung Power Indonesia 730,239 464,791 99,169 13,619 Incheon New Power Co., Ltd. 2,633 755 4,497 1,244 Seokmun Energy Co., Ltd. 212,509 152,731 61,513 12,064 Daehan Wind Power PSC 145,065 117,219 17,958 5,524 Barakah One Company 33,587,352 34,422,965 498,129 (444,338 ) Nawah Energy Company 338,883 337,134 395,580 3 Momentum 7,315 6,280 30,864 1,036 Daegu Green Power Co., Ltd. 551,431 459,881 516,254 9,364 Yeonggwang Wind Power Co., Ltd. 233,695 189,737 31,221 6,700 Chester Solar IV SpA 12,728 12,469 1,521 (174 ) Chester Solar V SpA 4,364 4,315 520 83 Diego de Almagro Solar SpA 15,908 14,946 1,877 (288 ) South Jamaica Power Company Limited 521,558 289,359 314,064 33,348 Daesan Green Energy Co., Ltd. 245,826 190,918 101,689 (6,641 ) RE Holiday Holdings LLC 351,243 180,503 22,671 3,022 RE Pioneer Holdings LLC 263,232 152,888 15,701 369 RE Barren Ridge 1 Holdings LLC 226,504 100,436 11,740 (903 ) RE Astoria 2 LandCo LLC 13,517 319 1,004 913 RE Barren Ridge LandCo LLC 4,761 95 389 357 Laurel SpA 11,221 10,447 1,424 54 KIAMCO KOWEPO Bannerton Hold Co Pty Ltd 29,517 74 — (260 ) Chile Solar JV SpA 75,246 55,609 7,842 6,425 Cheong-Song Noraesan Wind Power Co., Ltd. 55,948 41,464 7,988 1,916 Chester Solar I SpA 13,246 10,933 1,094 (221 ) Solar Philippines Calatagan Corporation 113,327 36,756 17,728 10,194 Saemangeum Solar Power Co., Ltd. 35,890 6,817 — (479 ) Chungsongmeon BongSan wind power Co., Ltd. 81,030 75,207 — (1,120 ) Jaeun Resident Wind Power Plant Co., Ltd. 89,756 82,047 — (190 ) DE Energia SpA 48,350 62,481 5,959 (1,109 ) Dangjin Eco Power Co., Ltd. 98,714 20,721 4,185 700 Haemodum Solar Co., Ltd. 22,974 16,103 2,556 581 Yangyang Wind Power Co., Ltd. 107,471 85,829 — (634 ) HORUS SOLAR, S.A. DE C.V. 156,436 133,714 5,568 5,628 RECURSOS SOLARES PV DE MEXICO II, S.A. DE C.V. 173,262 155,009 468 457 SUNMEX RENOVABLES, S.A. DE C.V. 129,502 118,449 — (1,008 ) Stavro Holding II A.B. 85,883 27 — 61 Solaseado Solar Power Co., Ltd. 363,492 325,262 51,198 16,301 Yeongam Solar Power Co., Ltd. 329,714 281,791 44,568 8,563 Samsu Wind Power Co., Ltd. 71,123 54,254 10,118 1,987 2022 Investees Total assets Total liabilities Sales Profit (loss) for the year In millions of won <Joint ventures> Pulau Indah Power Plant Sdn. Bhd. ￦ 760,536 675,853 797 6,723 NH-Amundi 71,851 74 4,850 5,431 Shin-han 17,341 22 38 (10 ) PT Barito Wahana Tenaga 447,688 — — 49,471 Cheongna Energy Co., Ltd. 385,935 368,340 100,200 (889 ) Naepo Green Energy Co., Ltd. 448,309 499,528 8,905 (34,347 ) Dayone Energy Co., Ltd. 470,677 530,304 278,363 (12,893 ) OneEnergy Asia Limited 1,039,987 673,223 — 16,041 KAS Investment I LLC 61,907 861 1,603 6,998 KAS Investment II LLC 61,661 861 1,592 6,967 Energyco Co., Ltd. 56,996 52,304 7,898 2,258 CAES, LLC 49,676 6 — (547 ) Hapcheon Floating Photovoltaic Power Plant Inc. 78,768 61,561 12,705 3,061 Busan Industrial Solar Power Co., Ltd. 21,149 18,016 3,190 901 Bitsolar Energy Co., Ltd. 78,779 83,324 9,557 261 Pulau Indah O&M Sdn. Bhd. — — — — Guadalupe Solar SpA 10,148 8,790 924 (43 ) Omisan Wind Power Co., Ltd. 142,274 117,881 — (519 ) Foresight Iberian Solar Group Holding, S.L. 94,181 81,997 — (1,365 ) Yeongwol Eco Wind Co., Ltd. 87,856 83,281 — (144 ) Gurae Resident Power Co., Ltd. 11,649 10,467 — (19 ) Cheongju Eco Park Co., Ltd. 152,139 116,639 66,260 17,319 Enel X Midland Photovoltaic, LLC 10,289 1,010 1,684 837 Geumsungsan Wind Power Co., Ltd. 125,324 115,196 — (1,770 ) KEPCO KPS CARABAO Corp. 2,025 1,582 611 (327 ) Prime Swedish Holding AB 77,942 114 — (577 ) Goheung New Energy Co., Ltd. 136,682 113,393 — (1,591 ) Gunsan Land Solar Co., Ltd. 158,371 121,785 28,828 12,154 CapMan Lynx SCA, SICAR 112,718 102,810 504 (16,780 ) International Offshore Power Transmission Holding Company Limited 4,680 71,468 — (68,093 ) Pyeongchang Wind Power Co., Ltd. 70,599 45,661 14,524 3,693 Eumseong Eco Park Co., Ltd. 136,909 119,736 — (636 ) Songsan Green Energy Co., Ltd. 5,500 — — (69 ) Changwon Nu-ri 1,490 — — (10 ) Hasami Wind Farm Corporation 3,100 — — (23 ) PungBack Wind Farm Corporation 46,957 31,667 — (3,089 ) Trumbull Asset Management, LLC 316 — 656 323 S-Power 2,430 2,450 1,334 22 Seungmun Green Energy 46,283 18,843 — 367 Seobusambo highway photovoltaics Co., Ltd. 8,286 4,453 217 265 (*1) The profit for the year ended December 31, 2022 is reduced by the associate entity’s net income (loss) attributable to non-controlling 2021 Investees Total assets Total liabilities Sales Profit (loss) for the year In millions of won <Associates> Korea Gas Corporation (*1) ￦ 43,669,902 34,550,567 27,520,756 950,757 Korea Electric Power Industrial Development Co., Ltd. 158,163 73,278 312,705 7,233 YTN Co., Ltd. 367,950 126,062 137,439 51,044 Gangwon Wind Power Co., Ltd. 71,153 1,121 19,623 5,433 Hyundai Green Power Co., Ltd. 812,287 391,754 101,818 (280 ) Korea Power Exchange 331,640 61,912 110,075 492 Taebaek Wind Power Co., Ltd. 30,375 3,176 5,744 1,588 Taebaek Guinemi Wind Power Co., Ltd. 43,411 29,985 5,910 1,371 Pyeongchang Wind Power Co., Ltd. 69,939 48,295 10,087 1,537 Daeryun Power Co., Ltd. 757,157 476,152 188,193 (10,232 ) Changjuk Wind Power Co., Ltd. 29,539 1,690 6,213 3,265 KNH Solar Co., Ltd. 13,859 5,423 3,222 805 SPC Power Corporation 242,058 18,535 54,042 35,441 Gemeng International Energy Co., Ltd. 8,151,333 5,976,164 2,511,377 (404,570 ) PT. Cirebon Electric Power 697,614 254,089 273,650 39,965 KNOC Nigerian East Oil Co., Ltd. 24,693 102,722 — (99 ) KNOC Nigerian West Oil Co., Ltd. 26,625 98,360 — (99 ) PT Wampu Electric Power 209,172 132,917 20,294 7,102 PT. Bayan Resources TBK 2,884,474 743,452 3,264,057 1,456,893 S-Power Co., Ltd. 856,963 603,519 608,259 24,998 Pioneer Gas Power Limited 282,577 438,366 — (36,864 ) Eurasia Energy Holdings 606 1,082 — — Xe-Pian Xe-Namnoy Power Co., Ltd. 1,321,406 947,430 161,686 76,996 PT. Mutiara Jawa 24,355 15,498 10,958 2,835 Samcheok Eco Materials Co., Ltd. 26,545 1,854 14,281 1,237 Noeul Green Energy Co., Ltd. 109,354 96,222 36,029 (1,269 ) Goseong Green Power Co., Ltd. 5,483,090 4,508,569 988,933 124,639 Gangneung Eco Power Co., Ltd. 4,001,681 3,851,537 — (4,188 ) Shin Pyeongtaek Power Co., Ltd. 1,028,028 764,551 653,117 57,202 Haeng Bok Do Si Photovoltaic Power Co., Ltd. 1,823 1,033 426 46 Dongducheon Dream Power Co., Ltd. 1,398,244 1,139,521 750,127 (16,685 ) Jinbhuvish Power Generation Pvt. Ltd. 62,926 12,995 — — Daejung Offshore Wind Power Co., Ltd. 5,321 1,664 — (149 ) GS Donghae Electric Power Co., Ltd. 2,149,060 1,432,083 760,323 44,035 Daegu Photovoltaic Co., Ltd. 13,046 4,970 3,519 1,621 Busan Green Energy Co., Ltd. 163,016 145,664 45,088 (10,843 ) Gunsan Bio Energy Co., Ltd. 8,503 28,981 — (1,496 ) Korea Electric Vehicle Charging Service 13,351 6,207 13,808 (1,022 ) Hansuwon KNP Co., Ltd. 1,409 100 836 64 Korea Electric Power Corporation Fund 49,150 237 9,773 9,534 Energy Infra Asset Management Co., Ltd. 11,196 426 4,703 1,306 Daegu clean Energy Co., Ltd. 368 324 — (1 ) YaksuESS Co., Ltd. 6,999 4,535 1,715 903 Nepal Water & Energy Development Company Private Limited 153,184 58,545 — (642 ) Gwangyang Green Energy Co., Ltd. 128,375 1,136 — (688 ) PND Solar Co., Ltd. 37,152 33,444 5,078 (128 ) Hyundai Eco Energy Co., Ltd. 186,309 158,111 25,762 6,921 YeongGwang Yaksu Wind Electric Co., Ltd. 40,484 41,176 7,066 (914 ) Green Energy Electricity Generation Co., Ltd. 75,664 72,442 2,796 (58 ) Korea Energy Solutions Co., Ltd. 654 40 228 (347 ) ITR Co., Ltd. 529 372 135 (29 ) Structure test network Co., Ltd. 1,665 400 1,451 1,134 Namjeongsusang Solar Power Operation Co., Ltd. 56,376 54,104 7,095 (1,280 ) Indeck Niles Development, LLC 1,051,557 729,078 — (25,184 ) Indeck Niles Asset Management, LLC 347 13 2,232 1,135 2021 Investees Total assets Total liabilities Sales Profit (loss) for the year In millions of won <Associates> Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 ￦ 14,778 211 848 815 Suwon New Power Co., Ltd. 1,997 30 — 2 KPGE Inc. 1,086 20 709 77 Gwangbaek Solar Power Investment Co., Ltd. 320,001 309,796 14,615 125 Go deok Clean Energy Co., Ltd. 65,566 54,811 — (2,482 ) SureDataLab Co., Ltd. 612 79 733 205 SEP Co., Ltd. 132 100 — (2 ) Hankook Electric Power Information Co., Ltd. 1,512 876 1,887 229 Tronix Co., Ltd. 1,002 455 2,228 89 O2&B Global Co., Ltd. 231 54 345 3 Muan Sunshine Solar Power Plant Co., Ltd. 142,858 138,987 15,582 (156 ) Bigeum Resident Photovoltaic Power Co., Ltd. 22,159 23,158 — (608 ) Goesan Solar Park Co., Ltd. 52,443 45,799 6,388 836 Saemangeum Heemang Photovoltaic Co., Ltd. 157,298 130,158 902 (2,237 ) Bitgoel Eco Energy Co., Ltd. 51,471 36,450 — (900 ) Jeju Gimnyeong Wind Power Co., Ltd. 65,754 62,716 6,915 (2,085 ) Seoroseoro Sunny Power Plant Co., Ltd. 5,833 4,186 469 36 Muan Solar Park Co., Ltd. 226,920 198,132 30,990 8,639 YuDang Solar Co., Ltd. 22,430 19,604 3,452 626 Anjwa Smart Farm & Solar City Co., Ltd. 278,981 249,143 37,691 5,996 Daewon Green Energy Co., Ltd. 131,218 116,100 18 (130 ) G.GURU Co., Ltd. 1,644 8 58 (346 ) UD4M Co., Ltd. 1,359 205 1,004 196 Dongbu Highway Solar Co., Ltd. 18,794 17,721 2,394 163 Seobu Highway Solar Co., Ltd. 19,828 18,384 2,647 315 Korea Energy Data Co., Ltd. 238 27 86 6 Gangneung Sacheon Fuel Cell Co., Ltd. 2,758 3 — (123 ) Kosture Co., Ltd. 150 26 166 11 Digital Innovation Growth Fund 12,857 — 4 (143 ) Taebaek Gadeoksan Wind Power Co., Ltd. 166,172 124,570 22,773 8,732 Chuncheon Green Energy Co., Ltd. 4,901 20 — (101 ) Yeomsubong Wind Power Co., Ltd. 400 396 — (17 ) Yeongyang Wind Power Corporation II 28,972 9,456 — (1,233 ) Haeparang Energy Co., Ltd. 9,566 681 — (2 ) Saemangeum Sebit Power Plant Co., Ltd. 105,259 96,963 — (190 ) <Joint ventures> KEPCO-Uhde Inc. 128 14 — (84 ) Shuweihat Asia Power Investment B.V. 75,652 — — 23,905 Shuweihat Asia Operation & Maintenance Company 2,586 77 2,821 2,002 Waterbury Lake Uranium L.P. 65,240 14 — — ASM-BG Investicii AD 74,977 37,593 13,161 5,365 RES Technology AD 63,495 30,090 8,142 2,220 KV Holdings, Inc. 6,318 1 10 2,405 KEPCO SPC Power Corporation 290,981 26,381 181,443 49,499 Gansu Datang Yumen Wind Power Co., Ltd. 75,268 58,680 9,666 (1,547 ) Datang Chifeng Renewable Power Co., Ltd. 827,213 315,746 120,989 24,398 Datang KEPCO Chaoyang Renewable Power Co., Ltd. 198,437 87,895 29,094 3,905 Rabigh Electricity Company 2,410,335 1,910,203 266,822 34,268 Rabigh Operation & Maintenance Company Limited 29,107 18,930 32,079 9,808 Jamaica Public Service Company Limited 2,174,800 1,469,297 1,113,943 41,277 KW Nuclear Components Co., Ltd. 42,033 6,678 32,938 12,335 Busan Shinho Solar Power Co., Ltd. 37,016 13,653 7,918 3,261 Global Trade Of Power System Co., Ltd. 2,443 385 6,355 76 Expressway Solar-light Power Generation Co., Ltd. 13,747 3,113 2,637 466 Amman Asia Electric Power Company 731,745 433,946 17,753 30,815 2021 Investees Total assets Total liabilities Sales Profit (loss) for the year In millions of won <Joint ventures> KAPES, Inc. ￦ 92,790 59,099 87,775 1,571 Honam Wind Power Co., Ltd. 33,623 19,800 5,395 531 Korea Power Engineering Service Co., Ltd. 24,068 5,397 11,259 709 Chun-cheon Energy Co., Ltd. 610,650 523,223 327,534 (5,451 ) Yeonggwangbaeksu Wind Power Co., Ltd. 82,439 64,290 8,411 (2,302 ) Nghi Son 2 Power LLC 2,982,805 3,020,684 548,027 84,276 Kelar S.A. 655,236 526,063 84,504 3,641 PT. Tanjung Power Indonesia 713,715 580,727 89,491 14,511 Incheon New Power Co., Ltd. 3,240 2,606 2,336 109 Seokmun Energy Co., Ltd. 219,414 171,682 41,555 (3,434 ) Daehan Wind Power PSC 137,388 127,080 6,794 7,581 Barakah One Company 29,707,801 29,951,656 253,653 4,011 Nawah Energy Company 155,191 153,559 — — Momentum 7,546 6,442 34,527 1,105 Daegu Green Power Co., Ltd. 541,304 459,536 295,645 1,796 Yeonggwang Wind Power Co., Ltd. 239,701 202,410 25,892 958 Chester Solar IV SpA 11,966 12,144 1,344 (2,060 ) Chester Solar V SpA 4,034 4,256 440 (601 ) Diego de Almagro Solar SpA 15,155 14,572 1,615 (2,103 ) South Jamaica Power Company Limited 474,664 287,852 224,159 5,743 Daesan Green Energy Co., Ltd. 264,618 203,921 88,147 (3,310 ) RE Holiday Holdings LLC 335,130 188,796 19,724 10,897 RE Pioneer Holdings LLC 220,390 126,361 12,925 9,307 RE Barren Ridge 1 Holdings LLC 201,629 87,291 10,575 (541 ) RE Astoria 2 LandCo LLC 12,294 298 889 799 RE Barren Ridge LandCo LLC 4,328 89 345 315 Laurel SpA 10,566 10,350 1,159 (1,425 ) KIAMCO KOWEPO Bannerton Hold Co Pty Ltd 30,809 1,573 — (916 ) Chile Solar JV SpA 68,445 3,531 3,060 1,408 Cheong-Song Noraesan Wind Power Co., Ltd. 57,047 43,106 7,929 2,309 Chester Solar I SpA 12,965 11,043 1,065 (1,146 ) Solar Philippines Calatagan Corporation 117,324 46,759 19,418 11,782 Saemangeum Solar Power Co., Ltd. 35,323 5,771 — (631 ) Chungsongmeon BongSan wind power Co., Ltd. 74,683 67,696 — (1,186 ) Jaeun Resident Wind Power Plant Co., Ltd. 81,477 74,724 — (1,325 ) DE Energia SpA 49,201 59,587 5,219 (2,954 ) Dangjin Eco Power Co., Ltd. 98,010 22,223 4,139 805 Haemodum Solar Co., Ltd. 23,038 16,750 1,799 45 Yangyang Wind Power Co., Ltd. 53,586 31,291 — (965 ) Horus Solar, S.A. De C.V. 192,650 177,514 8,392 16,664 Recursos Solares PV De Mexico II, S.A. De C.V. 153,855 138,033 — 4,842 Sunmex Renovables, S.A. De C.V. 90,956 80,218 — (333 ) Stavro Holding II A.B. 88,220 87 — (276 ) Solaseado Solar Power Co., Ltd. 367,915 345,987 41,684 4,170 Yeongam Solar Power Co., Ltd. 324,132 292,213 37,301 4,930 Samsu Wind Power Co., Ltd. 69,213 54,331 3,918 1,162 Pulau Indah Power Plant Sdn. Bhd. 404,458 338,635 228 (2,589 ) Sam-Yang Photovoltaic Power Co., Ltd. 50,837 40,647 7,376 150 NH-Amundi Global Infrastructure Investment Private Investment Trust 21 70,910 38 3,428 6,468 Shin-han BNPP Private Investment Trust for East-West Sunlight Dream 18,121 23 333 288 PT Barito Wahana Tenaga 266,584 39 — 25,839 Cheongna Energy Co., Ltd. 357,248 338,763 77,640 12,743 Naepo Green Energy Co., Ltd. 222,885 249,415 7,044 (21,392 ) Dayone Energy Co., Ltd. 452,509 504,351 143,870 409 2021 Investees Total assets Total liabilities Sales Profit (loss) for the year In millions of won <Joint ventures> OneEnergy Asia Limited ￦ 136,247 777 — (2,844 ) KAS Investment I LLC 52,681 1,583 (19,390 ) (23,007 ) KAS Investment II LLC 52,476 1,581 (19,311 ) (21,801 ) Energyco Co., Ltd. 59,662 57,227 168 (2,514 ) CAES, LLC 43,089 — — (923 ) Hapcheon Floating Photovoltaic Power Plant Inc. 73,978 59,832 1,120 (972 ) Busan Industrial Solar Power Co., Ltd. 19,085 17,937 1,879 566 Bitsolar Energy Co., Ltd. 80,307 85,340 8,298 (1,105 ) Pulau Indah O&M Sdn. Bhd. — — — — Guadalupe Solar SpA 8,774 7,839 12 (1,119 ) Omisan Wind Power Co., Ltd. 128,724 103,802 — (320 ) Foresight Iberian Solar Group Holding, S.L. 90,610 79,519 168 (603 ) Yeongwol Eco Wind Co., Ltd. 43,784 39,066 — 421 Gurae Resident Power Co., Ltd. 6,932 5,734 — 42 Cheongju Eco Park Co., Ltd. 138,657 120,485 6,454 (1,708 ) Enel X Midland Photovoltaic, LLC 9,053 611 122 (31 ) Geumsungsan Wind Power Co., Ltd. 66,862 47,906 — (2,146 ) KEPCO KPS Carabao Corp. 3,482 2,516 5,309 733 Prime Swedish Holding AB 34,257 20 — (5 ) Goheung New Energy Co., Ltd. 55,145 32,125 — (2,711 ) Gunsan Land Solar Co., Ltd. 86,654 60,996 432 432 CapMan Lynx SCA, SICAR 113,658 93,706 — — International Offshore Power Transmission Holding Company Limited 5 — — — (*1) The profit for the year ended December 31, 2021 is reduced by the associate entity’s net income (loss) attributable to non-controlling interests.
Summary of Financial Information of Associates and Joint Ventures in Consolidated Financial Statements	(5) Financial information of associates and joint ventures reconciled to the Company’s investments in consolidated financial statements as of December 31, 2021 and 2022 are as follows: 2021 Investees Net assets Percentage Share in net assets Investment differential Intercompany transaction Others Book value In millions of won <Associates> Korea Gas Corporation ￦ 9,119,335 20.47 % 1,866,728 — — (51,215 ) 1,815,513 Korea Electric Power Industrial Development Co., Ltd. 84,885 29.00 % 24,617 — — — 24,617 YTN Co., Ltd. 241,863 21.43 % 51,828 — — — 51,828 Gangwon Wind Power Co., Ltd. 70,032 15.00 % 10,505 49 — — 10,554 Hyundai Green Power Co., Ltd. 420,533 29.00 % 121,955 — — — 121,955 Korea Power Exchange 269,728 100.00 % 269,728 — — — 269,728 Taebaek Wind Power Co., Ltd. 27,199 25.00 % 6,800 — — — 6,800 Taebaek Guinemi Wind Power Co., Ltd. 13,426 25.00 % 3,357 — — — 3,357 Pyeongchang Wind Power Co., Ltd. 21,644 25.00 % 5,411 — — — 5,411 Daeryun Power Co., Ltd. 281,005 9.34 % 26,246 — — (820 ) 25,426 Changjuk Wind Power Co., Ltd. 27,849 30.00 % 8,355 — — — 8,355 KNH Solar Co., Ltd. 8,436 27.00 % 2,278 — — — 2,278 SPC Power Corporation 223,523 38.00 % 84,939 — — (19,893 ) 65,046 Gemeng International Energy Co., Ltd. 2,175,169 34.00 % 739,557 — — (144,339 ) 595,218 PT. Cirebon Electric Power 443,525 27.50 % 121,969 — — — 121,969 KNOC Nigerian East Oil Co., Ltd. (78,029 ) 14.63 % (11,416 ) — — 11,416 — KNOC Nigerian West Oil Co., Ltd. (71,735 ) 14.63 % (10,495 ) — — 10,495 — PT Wampu Electric Power 76,255 46.00 % 35,077 — — — 35,077 PT. Bayan Resources TBK 2,141,022 20.00 % 428,204 309,464 — (76,379 ) 661,289 S-Power Co., Ltd. 253,444 49.00 % 124,188 — (1,402 ) — 122,786 Pioneer Gas Power Limited (155,789 ) 38.50 % (59,975 ) 22,278 — 37,697 — Eurasia Energy Holdings (476 ) 40.00 % (190 ) — — 190 — Xe-Pian Xe-Namnoy Power Co., Ltd. 373,976 25.00 % 93,494 305 (1,069 ) (289 ) 92,441 PT. Mutiara Jawa 8,857 29.00 % 2,569 — — — 2,569 Samcheok Eco Materials Co., Ltd. 24,691 25.54 % 6,306 — — (6,306 ) — Noeul Green Energy Co., Ltd. 13,132 29.00 % 3,808 — — — 3,808 Goseong Green Power Co., Ltd. 902,746 29.00 % 261,796 — (938 ) — 260,858 Gangneung Eco Power Co., Ltd. 150,144 1.61 % 2,419 — (131 ) — 2,288 Shin Pyeongtaek Power Co., Ltd. 263,477 40.00 % 105,391 3,559 (15,876 ) — 93,074 Haeng Bok Do Si Photovoltaic Power Co., Ltd. 790 28.00 % 221 — — 2 223 Dongducheon Dream Power Co., Ltd. 258,723 34.01 % 87,992 1,757 (2,969 ) (12,582 ) 74,198 Jinbhuvish Power Generation Pvt. Ltd. 49,931 5.16 % 2,576 — — (2,576 ) — Daejung Offshore Wind Power Co., Ltd. 3,657 46.59 % 1,704 — — — 1,704 GS Donghae Electric Power Co., Ltd. 716,977 34.00 % 243,772 — — — 243,772 Daegu Photovoltaic Co., Ltd. 8,076 29.00 % 2,342 — — — 2,342 Busan Green Energy Co., Ltd. 17,352 29.00 % 5,032 — — — 5,032 Gunsan Bio Energy Co., Ltd. (20,478 ) 18.87 % (3,864 ) — — 3,864 — Korea Electric Vehicle Charging Service 7,144 17.50 % 1,250 — — — 1,250 Hansuwon KNP Co., Ltd. 1,309 28.98 % 379 — — (160 ) 219 Korea Electric Power Corporation Fund 48,913 98.09 % 47,979 — — 4 47,983 Energy Infra Asset Management Co., Ltd. 10,770 9.90 % 1,066 — — — 1,066 Daegu clean Energy Co., Ltd. 44 28.00 % 12 — — — 12 YaksuESS Co., Ltd. 2,464 29.00 % 715 1 — — 716 Nepal Water & Energy Development Company Private Limited 94,639 69.06 % 65,361 972 — — 66,333 Gwangyang Green Energy Co., Ltd. 127,239 20.00 % 25,448 18 — — 25,466 PND Solar Co., Ltd. 3,708 29.00 % 1,075 154 — — 1,229 Hyundai Eco Energy Co., Ltd. 28,198 19.00 % 5,358 214 — — 5,572 YeongGwang Yaksu Wind Electric Co., Ltd. (692 ) 9.63 % (67 ) 300 — — 233 Green Energy Electricity Generation Co., Ltd. 3,222 29.00 % 934 779 — — 1,713 Korea Energy Solutions Co., Ltd. 614 20.00 % 123 — — — 123 ITR Co., Ltd. 157 20.00 % 31 1 — — 32 Structure Test Network Co., Ltd. 1,265 20.00 % 253 53 — — 306 2021 Investees Net assets Percentage Share in net assets Investment differential Intercompany transaction Others Book value In millions of won <Associates> Namjeongsusang Solar Power Operation Co., Ltd. ￦ 2,272 15.00 % 341 20 — — 361 Indeck Niles Development, LLC 322,479 56.25 % 181,395 64,878 — — 246,273 Indeck Niles Asset Management, LLC 334 33.33 % 111 — — — 111 Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 14,567 49.00 % 7,138 — — — 7,138 Suwon New Power Co., Ltd. 1,967 39.90 % 785 — 250 — 1,035 KPGE Inc. 1,066 29.00 % 309 — — — 309 Gwangbaek Solar Power Investment Co., Ltd. 10,205 44.00 % 4,490 316 — — 4,806 Go deok Clean Energy Co., Ltd. 10,755 40.00 % 4,302 — — — 4,302 SureDataLab Co., Ltd. 533 23.95 % 128 — — — 128 SEP Co., Ltd. 32 21.26 % 7 — — — 7 Hankook Electric Power Information Co., Ltd. 636 25.25 % 161 — — — 161 Tronix Co., Ltd. 547 20.00 % 109 — — — 109 O2&B Global Co., Ltd. 177 20.00 % 35 — — — 35 Muan Sunshine Solar Power Plant Co., Ltd. 3,871 20.00 % 774 494 — — 1,268 Bigeum Resident Photovoltaic Power Co., Ltd. (999 ) 29.90 % (299 ) 24 — 275 — Goesan Solar Park Co., Ltd. 6,644 29.00 % 1,927 — — — 1,927 Saemangeum Heemang Photovoltaic Co., Ltd. 27,140 35.00 % 9,499 739 — — 10,238 Bitgoel Eco Energy Co., Ltd. 15,021 29.00 % 4,356 — — — 4,356 Jeju Gimnyeong Wind Power Co., Ltd. 3,038 30.00 % 911 — — — 911 Seoroseoro Sunny Power Plant Co., Ltd. 1,647 42.58 % 701 20 — — 721 Muan Solar Park Co., Ltd. 28,788 20.00 % 5,758 325 — — 6,083 YuDang Solar Co., Ltd. 2,826 20.00 % 565 — — — 565 Anjwa Smart Farm & Solar City Co., Ltd. 29,838 20.00 % 5,968 816 — — 6,784 Daewon Green Energy Co., Ltd. 15,118 25.36 % 3,833 44 — — 3,877 G.GURU Co., Ltd. 1,636 24.65 % 403 — — — 403 UD4M Co., Ltd. 1,154 12.50 % 144 — — — 144 Dongbu Highway Solar Co., Ltd. 1,073 20.00 % 215 50 — — 265 Seobu Highway Solar Co., Ltd. 1,444 20.00 % 289 — — — 289 Korea Energy Data Co., Ltd. 211 29.37 % 62 — — — 62 Gangneung Sacheon Fuel Cell Co., Ltd. 2,755 65.00 % 1,791 87 — — 1,878 Kosture Co., Ltd. 124 0.26 % — — — — — Digital Innovation Growth Fund 12,857 76.92 % 9,890 — — — 9,890 Taebaek Gadeoksan Wind Power Co., Ltd. 41,602 39.65 % 16,495 — — — 16,495 Chuncheon Green Energy Co., Ltd. 4,881 68.00 % 3,319 53 — — 3,372 Yeomsubong Wind Power Co., Ltd. 4 48.72 % 2 93 — — 95 Yeongyang Wind Power Corporation II 19,516 30.00 % 5,855 2,110 — — 7,965 Haeparang Energy Co., Ltd. 8,885 25.00 % 2,221 20 — — 2,241 Saemangeum Sebit Power Plant Co., Ltd. 8,296 69.55 % 5,770 230 — — 6,000 <Joint ventures> KEPCO-Uhde Inc. 114 50.85 % 58 — — — 58 Shuweihat Asia Power Investment B.V. 75,652 49.00 % 37,069 — — — 37,069 Shuweihat Asia Operation & Maintenance Company 2,509 55.00 % 1,380 — — — 1,380 Waterbury Lake Uranium L.P. 65,226 33.10 % 21,590 — — — 21,590 ASM-BG Investicii AD 37,384 50.00 % 18,692 — — — 18,692 RES Technology AD 33,405 50.00 % 16,703 — — — 16,703 KV Holdings, Inc. 6,317 40.00 % 2,527 — — — 2,527 KEPCO SPC Power Corporation 264,600 75.20 % 198,979 — — — 198,979 Gansu Datang Yumen Wind Power Co., Ltd. 16,588 40.00 % 6,635 — — — 6,635 Datang Chifeng Renewable Power Co., Ltd. 511,467 40.00 % 204,587 — — — 204,587 Datang KEPCO Chaoyang Renewable Power Co., Ltd. 110,542 40.00 % 44,217 — — — 44,217 Rabigh Electricity Company 500,132 40.00 % 200,053 — (55,571 ) (804 ) 143,678 Rabigh Operation & Maintenance Company Limited 10,177 40.00 % 4,071 — — — 4,071 Jamaica Public Service Company Limited 705,503 40.00 % 282,201 29,357 — (16,909 ) 294,649 KW Nuclear Components Co., Ltd. 35,355 45.00 % 15,910 — — (176 ) 15,734 2021 Investees Net assets Percentage Share in net assets Investment differential Intercompany transaction Others Book value In millions of won <Joint ventures> Busan Shinho Solar Power Co., Ltd. ￦ 23,363 25.00 % 5,841 — — — 5,841 Global Trade Of Power System Co., Ltd. 2,058 29.00 % 597 — — — 597 Expressway Solar-light Power Generation Co., Ltd. 10,634 29.00 % 3,084 — — — 3,084 Amman Asia Electric Power Company 297,799 60.00 % 178,679 — — — 178,679 KAPES, Inc. 33,691 51.00 % 17,182 — (20,697 ) 3,515 — Honam Wind Power Co., Ltd. 13,823 29.00 % 4,009 32 — — 4,041 Korea Power Engineering Service Co., Ltd. 18,671 29.00 % 5,415 — — — 5,415 Chun-cheon Energy Co., Ltd. 87,427 29.90 % 26,141 3 — (248 ) 25,896 Yeonggwangbaeksu Wind Power Co., Ltd. 18,149 15.00 % 2,722 6 — — 2,728 Nghi Son 2 Power LLC (37,879 ) 50.00 % (18,940 ) — — 18,940 — Kelar S.A. 129,173 65.00 % 83,962 2,733 — — 86,695 PT. Tanjung Power Indonesia 132,988 35.00 % 46,546 — — — 46,546 Incheon New Power Co., Ltd. 634 29.00 % 184 — — (184 ) — Seokmun Energy Co., Ltd. 47,732 29.00 % 13,842 — — — 13,842 Daehan Wind Power PSC 10,308 50.00 % 5,154 — — — 5,154 Barakah One Company (243,855 ) 18.00 % (43,894 ) — 1,058 42,836 — Nawah Energy Company 1,632 18.00 % 294 — — — 294 Momentum 1,104 33.33 % 368 — — — 368 Daegu Green Power Co., Ltd. 81,768 54.24 % 44,351 84 — (20,381 ) 24,054 Yeonggwang Wind Power Co., Ltd. 37,291 46.00 % 17,154 492 — — 17,646 Chester Solar IV SpA (178 ) 45.00 % (80 ) 60 — 20 — Chester Solar V SpA (222 ) 45.00 % (100 ) 125 — — 25 Diego de Almagro Solar SpA 583 45.00 % 262 100 — — 362 South Jamaica Power Company Limited 186,812 20.00 % 37,362 — — (2 ) 37,360 Daesan Green Energy Co., Ltd. 60,697 35.00 % 21,244 — — — 21,244 RE Holiday Holdings LLC 146,334 50.00 % 73,167 — — — 73,167 RE Pioneer Holdings LLC 94,029 50.00 % 47,015 — — — 47,015 RE Barren Ridge 1 Holdings LLC 114,338 50.00 % 57,169 — — (55,286 ) 1,883 RE Astoria 2 LandCo LLC 11,996 50.00 % 5,998 — — — 5,998 RE Barren Ridge LandCo LLC 4,239 50.00 % 2,120 — — — 2,120 Laurel SpA 216 45.00 % 97 193 — — 290 KIAMCO KOWEPO Bannerton Hold Co Pty Ltd 29,236 12.37 % 3,616 9 — — 3,625 Chile Solar JV SpA 64,914 50.00 % 32,457 — — — 32,457 Cheong-Song Noraesan Wind Power Co., Ltd. 13,941 29.01 % 4,045 61 — — 4,106 Chester Solar I SpA 1,922 45.00 % 865 255 — — 1,120 Solar Philippines Calatagan Corporation 70,565 38.00 % 26,815 — — 31,416 58,231 Saemangeum Solar Power Co., Ltd. 29,552 81.01 % 23,939 — — — 23,939 Chungsongmeon BongSan wind power Co., Ltd. 6,987 29.00 % 2,026 1,782 — — 3,808 Jaeun Resident Wind Power Plant Co., Ltd. 6,753 29.00 % 1,958 — — — 1,958 DE Energia SpA (10,386 ) 49.00 % (5,089 ) — — 14,010 8,921 Dangjin Eco Power Co., Ltd. 75,787 34.00 % 25,768 341 — — 26,109 Haemodum Solar Co., Ltd. 6,288 49.00 % 3,081 — — — 3,081 Yangyang Wind Power Co., Ltd. 22,295 50.00 % 11,148 43 — — 11,191 Horus Solar, S.A. De C.V. 15,136 14.95 % 2,262 3,580 — — 5,842 Recursos Solares PV De Mexico II, S.A. De C.V. 15,822 14.95 % 2,365 2,171 — — 4,536 Sunmex Renovables, S.A. De C.V. 10,738 14.95 % 1,605 5 — — 1,610 Stavro Holding II A.B. 88,133 20.00 % 17,627 — — — 17,627 Solaseado Solar Power Co., Ltd. 21,928 38.90 % 8,530 1,361 — — 9,891 Yeongam Solar Power Co., Ltd. 31,919 19.00 % 6,065 773 — — 6,838 Samsu Wind Power Co., Ltd. 14,882 19.00 % 2,828 — — — 2,828 Pulau Indah Power Plant Sdn. Bhd. 65,823 25.00 % 16,456 5,643 — — 22,099 Sam-Yang Photovoltaic Power Co., Ltd. 10,190 49.00 % 4,993 — — — 4,993 NH-Amundi Global Infrastructure Investment Private Investment Trust 21 70,872 29.53 % 20,929 527 — — 21,456 2021 Investees Net assets Percentage Share in net assets Investment differential Intercompany transaction Others Book value In millions of won <Joint ventures> Shin-han BNPP Private Investment Trust for East-West Sunlight Dream ￦ 18,098 90.00 % 16,288 — — — 16,288 PT Barito Wahana Tenaga 266,545 30.61 % 81,595 — — — 81,595 Cheongna Energy Co., Ltd. 18,485 50.10 % 9,261 3,137 (1,200 ) — 11,198 Naepo Green Energy Co., Ltd. (26,530 ) 29.20 % (7,747 ) — — 7,747 — Dayone Energy Co., Ltd. (51,842 ) 46.30 % (24,003 ) — (882 ) 24,885 — OneEnergy Asia Limited 135,470 40.00 % 54,188 25,512 — — 79,700 KAS Investment I LLC 51,098 29.89 % 15,273 — — — 15,273 KAS Investment II LLC 50,895 29.89 % 15,213 — — — 15,213 Energyco Co., Ltd. 2,435 29.00 % 706 829 — — 1,535 CAES, LLC 43,089 36.00 % 15,512 2,923 — — 18,435 Hapcheon Floating Photovoltaic Power Plant Inc. 14,146 49.00 % 6,932 39 — — 6,971 Busan Industrial Solar Power Co., Ltd. 1,148 28.02 % 322 290 — — 612 Bitsolar Energy Co., Ltd. (5,033 ) 27.10 % (1,364 ) 352 — 1,364 352 Pulau Indah O&M Sdn. Bhd. — 60.00 % — — — — — Guadalupe Solar SpA 935 60.00 % 561 98 — — 659 Omisan Wind Power Co., Ltd. 24,922 42.00 % 10,467 166 — — 10,633 Foresight Iberian Solar Group Holding, S.L. 11,091 75.00 % 8,318 1,425 — — 9,743 Yeongwol Eco Wind Co., Ltd. 4,718 29.00 % 1,368 1,828 — — 3,196 Gurae Resident Power Co., Ltd. 1,198 29.00 % 347 48 — — 395 Cheongju Eco Park Co., Ltd. 18,172 29.00 % 5,270 195 — — 5,465 Enel X Midland Photovoltaic, LLC 8,442 20.00 % 1,688 — — — 1,688 Geumsungsan Wind Power Co., Ltd. 18,956 29.00 % 5,497 556 — — 6,053 KEPCO KPS Carabao Corp. 966 40.00 % 386 — — — 386 Prime Swedish Holding AB 34,237 45.00 % 15,407 34 — — 15,441 Goheung New Energy Co., Ltd. 23,020 46.15 % 10,624 1,084 — — 11,708 Gunsan Land Solar Co., Ltd. 25,658 75.29 % 19,317 — — — 19,317 CapMan Lynx SCA, SICAR 19,952 50.00 % 9,976 — — — 9,976 International Offshore Power Transmission Holding Company Limited 5 35.00 % 2 (2 ) — — — (*) The percentage of ownership shown above is after considering the treasury stocks and others. 2022 Investees Net assets Percentage Share in net assets Investment differential Intercompany transaction Others Book value In millions of won <Associates> Korea Gas Corporation ￦ 10,410,740 20.47 % 2,131,078 — — (45,782 ) 2,085,296 Korea Electric Power Industrial Development Co., Ltd. 107,166 29.00 % 31,078 — — — 31,078 YTN Co., Ltd. 256,791 21.43 % 55,027 — — — 55,027 Gangwon Wind Power Co., Ltd. 80,729 15.00 % 12,109 49 — — 12,158 Hyundai Green Power Co., Ltd. 413,072 29.00 % 119,791 — — — 119,791 Korea Power Exchange 275,126 100.00 % 275,126 — — — 275,126 Taebaek Wind Power Co., Ltd. 24,168 60.00 % 14,501 — — — 14,501 Taebaek Guinemi Wind Power Co., Ltd. 15,327 67.25 % 10,307 — — 2,742 13,049 Daeryun Power Co., Ltd. 402,140 6.85 % 27,547 — — (820 ) 26,727 KNH Solar Co., Ltd. 10,679 27.00 % 2,883 — — — 2,883 SPC Power Corporation 228,534 38.00 % 86,843 — — (15,975 ) 70,868 Gemeng International Energy Co., Ltd. 2,335,997 34.00 % 794,239 — — (215,418 ) 578,821 PT. Cirebon Electric Power 491,324 27.50 % 135,114 — — — 135,114 KNOC Nigerian East Oil Co., Ltd. (83,483 ) 14.63 % (12,214 ) — — 12,214 — KNOC Nigerian West Oil Co., Ltd. (76,755 ) 14.63 % (11,229 ) — — 11,229 — PT Wampu Electric Power 82,051 46.00 % 37,743 — — — 37,743 PT. Bayan Resources TBK 2,476,409 20.00 % 495,282 265,817 — (76,380 ) 684,719 S-Power Co., Ltd. 290,656 49.00 % 142,421 — (1,293 ) — 141,128 Pioneer Gas Power Limited (205,787 ) 38.50 % (79,223 ) 22,278 — 56,945 — Eurasia Energy Holdings (508 ) 40.00 % (203 ) — — 203 — Xe-Pian Xe-Namnoy Power Co., Ltd. 466,385 25.00 % 116,596 305 (1,028 ) (289 ) 115,584 PT. Mutiara Jawa 12,402 29.00 % 3,597 — — — 3,597 Samcheok Eco Materials Co., Ltd. 23,343 25.54 % 5,962 — — (5,962 ) — Noeul Green Energy Co., Ltd. (18,861 ) 29.00 % (5,470 ) — — 5,470 — Goseong Green Power Co., Ltd. 1,001,651 29.00 % 290,479 — (1,586 ) — 288,893 Gangneung Eco Power Co., Ltd. 7,464 1.61 % 120 — (134 ) 14 — Shin Pyeongtaek Power Co., Ltd. 363,838 40.00 % 145,535 3,559 (15,271 ) — 133,823 Haeng Bok Do Si Photovoltaic Power Co., Ltd. 986 28.00 % 276 — — 2 278 Dongducheon Dream Power Co., Ltd. 302,071 34.01 % 102,734 1,757 (2,609 ) (12,582 ) 89,300 Jinbhuvish Power Generation Pvt. Ltd. 47,988 5.16 % 2,496 — — (2,496 ) — Daejung Offshore Wind Power Co., Ltd. 3,337 46.59 % 1,555 — — — 1,555 GS Donghae Electric Power Co., Ltd. 765,131 34.00 % 260,145 — — — 260,145 Daegu Photovoltaic Co., Ltd. 9,823 29.00 % 2,849 — — — 2,849 Busan Green Energy Co., Ltd. 15,156 29.00 % 4,395 — — — 4,395 Gunsan Bio Energy Co., Ltd. (21,127 ) 18.87 % (3,986 ) — — 3,986 — Hansuwon KNP Co., Ltd. 1,519 28.98 % 440 — — (160 ) 280 Korea Electric Power Corporation Fund 29,400 98.09 % 28,838 — — 4 28,842 Energy Infra Asset Management Co., Ltd. 11,956 9.90 % 1,184 — — — 1,184 Daegu clean Energy Co., Ltd. 44 28.00 % 12 — — — 12 YaksuESS Co., Ltd. 1,670 29.00 % 484 2 — — 486 Nepal Water & Energy Development Company Private Limited 99,862 69.06 % 68,968 972 — — 69,940 Gwangyang Green Energy Co., Ltd. 125,130 20.00 % 25,026 18 — — 25,044 PND solar Co., Ltd. 4,306 29.00 % 1,249 154 — — 1,403 Hyundai Eco Energy Co., Ltd. 39,033 19.00 % 7,416 215 — — 7,631 YeongGwang Yaksu Wind Electric Co., Ltd. 788 9.63 % 76 300 — (220 ) 156 Green Energy Electricity Generation Co., Ltd. 2,733 29.00 % 793 778 — — 1,571 Korea Energy Solutions Co., Ltd. 466 20.00 % 93 — — — 93 2022 Investees Net assets Percentage Share in net assets Investment differential Intercompany transaction Others Book value In millions of won <Associates> ITR Co., Ltd. ￦ (26 ) 20.00 % (5 ) 1 — 4 — Structure test network Co., Ltd. 1,565 20.00 % 313 53 — — 366 Namjeongsusang Solar Power Operation Co., Ltd. 2,355 15.00 % 353 20 — — 373 Indeck Niles Development, LLC 416,164 50.00 % 208,082 93,956 — — 302,038 Indeck Niles Asset Management, LLC 283 33.33 % 94 — — — 94 Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 14,146 49.00 % 6,932 — — — 6,932 Suwon New Power Co., Ltd. 1,978 33.05 % 654 — 265 — 919 Gwangbaek Solar Power Investment Co., Ltd. 10,949 44.00 % 4,818 315 — — 5,133 Go deok Clean Energy Co., Ltd. 11,049 40.00 % 4,420 — — — 4,420 SureDataLab Co., Ltd. 739 23.95 % 177 — — — 177 SEP Co., Ltd. (65 ) 21.26 % (14 ) — — 14 — Hankook Electric Power Information Co., Ltd. 1,337 16.49 % 220 — — — 220 Tronix Co., Ltd. 526 12.50 % 66 — — — 66 O2&B Global Co., Ltd. 181 20.00 % 36 — — — 36 Muan Sunshine Solar Power Plant Co., Ltd. 10,338 20.00 % 2,068 494 — — 2,562 Bigeum Resident Photovoltaic Power Co., Ltd. (1,539 ) 29.90 % (460 ) 24 — 436 — Goesan Solar Park Co., Ltd. 8,936 29.00 % 2,591 — — — 2,591 Saemangeum Heemang Photovoltaic Co., Ltd. 35,060 35.00 % 12,271 739 — — 13,010 Bitgoel Eco Energy Co., Ltd. 18,249 49.05 % 8,951 — — — 8,951 Jeju Gimnyeong Wind Power Co., Ltd. 2,907 30.00 % 872 — — — 872 Seoroseoro Sunny Power Plant Co., Ltd. 1,970 42.58 % 839 20 — — 859 Muan Solar park Co., Ltd. 37,565 20.00 % 7,513 325 — — 7,838 YuDang Solar Co., Ltd. 2,929 20.00 % 586 — — — 586 Anjwa Smart Farm & Solar City Co., Ltd. 39,225 20.00 % 7,845 817 — — 8,662 Daewon Green Energy Co., Ltd. 17,514 25.36 % 4,441 44 — — 4,485 G.GURU Co., Ltd. 1,216 24.65 % 300 — — — 300 UD4M Co., Ltd. 1,125 14.29 % 161 — — — 161 Dongbu Highway Solar Co., Ltd. 1,509 20.00 % 302 50 — — 352 Seobu Highway Solar Co., Ltd. 1,581 20.00 % 316 — — — 316 Korea Energy Data Co., Ltd. 211 29.37 % 62 — — — 62 Gangneung Sacheon Fuel Cell Co., Ltd. 10,218 41.00 % 4,189 88 — — 4,277 KOSTURE Co., Ltd. 156 0.82 % 1 — — — 1 Taebaek Gadeoksan Wind Power Co., Ltd. 58,940 34.00 % 20,040 — — — 20,040 Chuncheon Green Energy Co., Ltd. 20,226 45.00 % 9,102 53 — — 9,155 Yeomsubong Wind Power Co., Ltd. 1,540 3.81 % 59 3 — — 62 Yeongyang Wind Power Corporation II 17,837 30.00 % 5,351 2,110 — — 7,461 Haeparang Energy Co., Ltd. 8,673 25.00 % 2,168 20 — — 2,188 Saemangeum Sebit Power Plant Co., Ltd. 36,439 63.09 % 22,990 209 — — 23,199 Boulder Solar III, LLC 1,896 30.00 % 569 175 — — 744 PlatformN. Co., Ltd. 285 29.58 % 84 — — — 84 PT. Cirebon Energi Prasarana 690,347 10.00 % 69,035 — — — 69,035 Green Radiation Co., Ltd. 77 10.00 % 8 3 — — 11 Future Convergence Technology Laboratory. Co., Ltd. 249 20.12 % 50 — — — 50 SC E&G. Co,. Ltd. 1,068 20.00 % 214 — — — 214 Wang San Engineering. Co,. Ltd. 828 20.00 % 166 — — — 166 ACE 100 20.00 % 20 — — — 20 Environment and Energy Co., Ltd. 93 10.54 % 10 — — — 10 Santiago Solar Power SpA 26,748 50.00 % 13,373 — — — 13,373 Yanggu Floating Photovoltaic Power Plant Inc. 3,115 29.00 % 903 — — — 903 <Joint ventures> KEPCO-Uhde Inc. 33 50.85 % 17 — — — 17 Shuweihat Asia Power Investment B.V. 135,617 49.00 % 66,452 — — — 66,452 Shuweihat Asia Operation & Maintenance Company 2,966 55.00 % 1,631 — — — 1,631 Waterbury Lake Uranium L.P. 66,589 32.59 % 21,701 49 — — 21,750 ASM-BG Investicii AD 29,110 50.00 % 14,555 — — — 14,555 RES Technology AD 30,266 50.00 % 15,133 — — — 15,133 KV Holdings, Inc. 24,148 40.00 % 9,659 — — — 9,659 KEPCO SPC Power Corporation 238,822 75.20 % 179,594 — — — 179,594 Gansu Datang Yumen Wind Power Co., Ltd. 15,059 40.00 % 6,024 — — — 6,024 2022 Investees Net assets Percentage Share in net assets Investment differential Intercompany transaction Others Book value In millions of won <Joint ventures> Datang Chifeng Renewable Power Co., Ltd. ￦ 479,954 40.00 % 191,982 — — — 191,982 Datang KEPCO Chaoyang Renewable Power Co., Ltd. 110,995 40.00 % 44,398 — — — 44,398 Rabigh Electricity Company 665,110 40.00 % 266,044 — (50,632 ) (805 ) 214,607 Rabigh Operation & Maintenance Company Limited 12,782 40.00 % 5,113 — — — 5,113 Jamaica Public Service Company Limited 795,250 40.00 % 318,100 29,357 — (16,050 ) 331,407 KW Nuclear Components Co., Ltd. 38,368 45.00 % 17,266 — — (176 ) 17,090 Busan Shinho Solar Power Co., Ltd. 26,877 25.00 % 6,719 — — — 6,719 Global Trade Of Power System Co., Ltd. 2,406 29.00 % 698 — — — 698 Expressway Solar-light Power Generation Co., Ltd. 9,508 50.00 % 4,754 — — — 4,754 Amman Asia Electric Power Company 367,090 60.00 % 220,254 — — — 220,254 KAPES, Inc. 37,875 51.00 % 19,316 — (22,451 ) 3,135 — Honam Wind Power Co., Ltd. 16,506 29.00 % 4,787 32 — — 4,819 Korea Power Engineering Service Co., Ltd. 19,114 29.00 % 5,543 — — — 5,543 Chun-cheon Energy Co., Ltd. 107,990 29.90 % 32,289 3 — (248 ) 32,044 Yeonggwangbaeksu Wind Power Co., Ltd. 20,972 15.00 % 3,146 5 — — 3,151 Nghi Son 2 Power LLC 817,678 50.00 % 408,839 — — — 408,839 Kelar S.A. 175,717 65.00 % 114,216 2,921 — — 117,137 PT. Tanjung Power Indonesia 265,448 35.00 % 92,907 — — — 92,907 Incheon New Power Co., Ltd. 1,878 29.00 % 545 — — (347 ) 198 Seokmun Energy Co., Ltd. 59,778 29.00 % 17,336 — — — 17,336 Daehan Wind Power PSC 27,846 50.00 % 13,923 — — — 13,923 Barakah One Company (835,613 ) 18.00 % (150,410 ) — 56,437 93,973 — Nawah Energy Company 1,749 18.00 % 315 — — — 315 Momentum 1,035 33.33 % 345 — — — 345 Daegu Green Power Co., Ltd. 91,550 54.24 % 49,657 84 — (20,381 ) 29,360 Yeonggwang Wind Power Co., Ltd. 43,958 46.00 % 20,221 492 — — 20,713 Chester Solar IV SpA 259 45.00 % 117 64 — — 181 Chester Solar V SpA 49 45.00 % 22 134 — — 156 Diego de Almagro Solar SpA 962 45.00 % 433 107 — — 540 South Jamaica Power Company Limited 232,199 20.00 % 46,440 — — (3 ) 46,437 Daesan Green Energy Co., Ltd. 54,908 35.00 % 19,218 — — — 19,218 RE Holiday Holdings LLC 170,740 50.00 % 85,370 — — — 85,370 RE Pioneer Holdings LLC 110,344 50.00 % 55,172 — — — 55,172 RE Barren Ridge 1 Holdings LLC 126,068 50.00 % 63,034 — — (59,684 ) 3,350 RE Astoria 2 LandCo LLC 13,198 50.00 % 6,599 — — — 6,599 RE Barren Ridge LandCo LLC 4,666 50.00 % 2,333 — — — 2,333 Laurel SpA 774 45.00 % 348 206 — — 554 KIAMCO KOWEPO Bannerton Hold Co Pty Ltd 29,443 12.37 % 3,642 9 — — 3,651 Chile Solar JV SpA 19,637 50.00 % 9,819 — — — 9,819 Cheong-Song Noraesan Wind Power Co., Ltd. 14,484 29.01 % 4,202 61 — — 4,263 Chester Solar I SpA 2,313 45.00 % 1,041 273 — — 1,314 Solar Philippines Calatagan Corporation 76,571 38.00 % 29,097 — — 27,805 56,902 Saemangeum Solar Power Co., Ltd. 29,073 81.01 % 23,551 — — — 23,551 Chungsongmeon BongSan wind power Co., Ltd. 5,823 29.00 % 1,689 1,781 — — 3,470 Jaeun Resident Wind Power Plant Co., Ltd. 7,709 29.00 % 2,236 — — — 2,236 DE Energia SpA (14,131 ) 49.00 % (6,924 ) — — 16,460 9,536 Dangjin Eco Power Co., Ltd. 77,993 34.00 % 26,518 341 — — 26,859 Haemodum Solar Co., Ltd. 6,871 49.00 % 3,367 — — — 3,367 Yangyang Wind Power Co., Ltd. 21,642 50.00 % 10,821 43 — — 10,864 HORUS SOLAR, S.A. DE C.V. 22,722 14.95 % 3,396 3,580 — — 6,976 RECURSOS SOLARES PV DE MEXICO II, S.A. DE C.V. 18,253 14.95 % 2,728 2,171 — — 4,899 SUNMEX RENOVABLES, S.A. DE C.V. 11,053 14.95 % 1,652 5 — — 1,657 Stavro Holding II A.B. 85,856 20.00 % 17,171 — — — 17,171 Solaseado Solar Power Co., Ltd. 38,230 38.90 % 14,872 1,361 — — 16,233 2022 Investees Net assets Percentage Share in net assets Investment differential Intercompany transaction Others Book value In millions of won <Joint ventures> Yeongam Solar Power Co., Ltd. ￦ 47,923 19.00 % 9,105 774 — — 9,879 Samsu Wind Power Co., Ltd. 16,869 19.00 % 3,205 — — — 3,205 Pulau Indah Power Plant Sdn. Bhd. 84,683 25.00 % 21,171 5,643 — — 26,814 NH-Amundi Global Infrastructure Investment Private Investment Trust 21 71,777 29.53 % 21,196 527 — — 21,723 Shin-han BNPP Private Investment Trust for East-West Sunlight Dream 17,319 90.00 % 15,587 — — — 15,587 PT Barito Wahana Tenaga 447,688 30.61 % 137,047 — — — 137,047 Cheongna Energy Co., Ltd. 17,595 50.10 % 8,815 3,137 (1,194 ) — 10,758 Naepo Green Energy Co., Ltd. (51,219 ) 29.20 % (14,956 ) — — 14,956 — Dayone Energy Co., Ltd. (59,627 ) 46.30 % (27,607 ) — (868 ) 28,475 — OneEnergy Asia Limited 366,764 40.00 % 146,706 25,512 — — 172,218 KAS Investment I LLC 61,046 29.89 % 18,247 — — — 18,247 KAS Investment II LLC 60,800 29.89 % 18,173 — — — 18,173 Energyco Co., Ltd. 4,692 29.00 % 1,361 829 — — 2,190 CAES, LLC 49,670 36.00 % 17,881 2,924 — — 20,805 Hapcheon Floating Photovoltaic Power Plant Inc. 17,207 49.00 % 8,432 39 — — 8,471 Busan Industrial Solar Power Co., Ltd. 3,133 28.02 % 878 290 — — 1,168 Bitsolar Energy Co., Ltd. (4,545 ) 27.10 % (1,232 ) 352 — 1,232 352 Pulau Indah O&M Sdn. Bhd. — 60.00 % — — — — — Guadalupe Solar SpA 1,358 60.00 % 815 98 — — 913 Omisan Wind Power Co., Ltd. 24,393 42.00 % 10,245 166 — — 10,411 Foresight Iberian Solar Group Holding, S.L. 12,184 75.00 % 9,138 1,427 — — 10,565 Yeongwol Eco Wind Co., Ltd. 4,575 29.00 % 1,327 1,828 — — 3,155 Gurae Resident Power Co., Ltd. 1,182 29.00 % 343 48 — — 391 Cheongju Eco Park Co., Ltd. 35,500 29.00 % 10,295 195 — — 10,490 Enel X Midland Photovoltaic, LLC 9,279 20.00 % 1,856 — — — 1,856 Geumsungsan Wind Power Co., Ltd. 10,128 29.00 % 2,937 556 — — 3,493 KEPCO KPS CARABAO Corp. 443 40.00 % 177 — — — 177 Prime Swedish Holding AB 77,828 45.00 % 35,023 1,222 — — 36,245 Goheung New Energy Co., Ltd. 23,289 46.15 % 10,748 1,084 — — 11,832 Gunsan Land Solar Co., Ltd. 36,586 75.29 % 27,544 — — — 27,544 CapMan Lynx SCA, SICAR 9,908 50.00 % 4,954 — — (4,954 ) — International Offshore Power Transmission Holding Company Limited (66,788 ) 35.00 % (23,376 ) (2 ) — 23,378 — Pyeongchang Wind Power Co., Ltd. 24,938 58.00 % 14,464 — — — 14,464 Eumseong Eco Park Co., Ltd. 17,173 29.00 % 4,980 577 — — 5,557 Songsan Green Energy Co., Ltd. 5,500 25.00 % 1,375 12 — — 1,387 Changwon Nu-ri Energy Co., Ltd. 1,490 33.33 % 497 — — — 497 Hasami Wind Farm Corporation 3,100 29.00 % 899 690 — — 1,589 PungBack Wind Farm Corporation 15,290 37.00 % 5,657 1,086 — — 6,743 Trumbull Asset Management, LLC 316 78.00 % 246 — — — 246 S-Power Chile SpA (20 ) 50.00 % (10 ) — — 137 127 Seungmun Green Energy 27,440 33.00 % 9,054 — — — 9,054 Seobusambo highway photovoltaics Co., Ltd. 3,833 80.00 % 3,066 — — — 3,066 (*) The percentage of ownership shown above is after considering the treasury stocks and others.
Summary of Unrecognized Equity Interest in Investments in Associates and Joint Ventures	(6) As of December 31, 2021, and 2022, unrecognized equity interest in investments in associates and joint ventures whose book value has been reduced to zero due to accumulated losses are as follows: 2021 2022 Unrecognized Accumulated unrecognized Unrecognized Accumulated unrecognized In millions of won Eurasia Energy Holdings ￦ 15 190 13 203 Gunsan Bio Energy Co., Ltd. 282 3,864 122 3,986 Dayone Energy Co., Ltd. (1,244 ) 23,452 3,565 27,017 Nghi Son 2 Power LLC (114,340 ) 18,940 (18,940 ) — Samcheok Eco Materials Co., Ltd. (323 ) 462 344 806 Naepo Green Energy Co., Ltd. 5,469 7,747 7,209 14,956 Barakah One Company (26,502 ) 42,836 51,137 93,973 Pioneer Gas Power Limited 21,691 37,629 19,248 56,877 Incheon New Power Co., Ltd. (31 ) 163 (163 ) — Bigeum Resident Photovoltaic Power Co., Ltd. 182 298 162 460 KAPES, Inc. 317 3,515 (355 ) 3,160 Chester Solar IV SpA 21 21 (21 ) — ITR Co., Ltd. — — 5 5 SEP Co., Ltd. — — 14 14 International Offshore Power Transmission Holding Company Limited — — 23,378 23,378 Noeul Green Energy Co., Ltd. — — 5,470 5,470 Gangneung Eco Power Co., Ltd. — — 14 14
Summary of Shareholders' Agreements on Investments in Associates and Joint Ventures	(7) As of December 31, 2022, shareholders’ agreements on investments in associates and joint ventures that may cause future economic resource or cash outflows are as follows: (i) Gemeng International Energy Co., Ltd. Gemeng International Energy Co., Ltd. issued put options on 8% of its shares to its financial investors, KEPCO Woori Sprott PEF (NPS Co-Pa (ii) Taebaek Wind Power Co., Ltd. In the case where non-controlling (iii) Pyeongchang Wind Power Co., Ltd. In the case where non-controlling (iv) Daeryun Power Co., Ltd. The Group reserves the right to participate in the transfer of shares in Daeryun Power Co., Ltd. on the same terms as Daeryun E&S Co., Ltd., if Daeryun E&S Co., Ltd. wishes to transfer its shares in Daeryun Power Co., Ltd. (v) Daegu Green Power Co., Ltd. The Company has a right to purchase all the shares of Daegu Green Power Co., Ltd. held by the financial investors at the yield-based transfer amount agreed with the shareholders. The Company can exercise its right 5, 10 and 13 years after the date of the investment. Also, the Company has a right to purchase all or part of the shares of Daegu Green Power Co., Ltd. held by Lotte Engineering & Construction Co. at the yield-based transfer amount agreed with the shareholders. (vi) Yeonggwang Wind Power Co., Ltd. In case the Company intends to purchase all or part of the shares from Daehan Green Energy Co., Ltd., which is a non-controlling (vii) Chester Solar I SpA According to the shareholders’ agreement, the Company has an obligation to purchase the shares at the agreed yield-based transfer price on the agreed date of exercise and when Sprott Chile Solar I SpA intends to sell its shares. (viii) Chester Solar IV SpA According to the shareholders’ agreement, the Company has an obligation to purchase the shares at the agreed yield-based transfer price on the agreed date of exercise and when Sprott Chile Solar I SpA intends to sell its shares. (ix) Chester Solar V SpA According to the shareholders’ agreement, the Company has an obligation to purchase the shares at the agreed yield-based transfer price on the agreed date of exercise and when Sprott Chile Solar I SpA intends to sell its shares. (x) Diego de Almagro Solar SpA According to the shareholders’ agreement, the Company has an obligation to purchase the shares at the agreed yield-based transfer price on the agreed date of exercise and when Sprott Chile Solar I SpA intends to sell its shares. (xi) Laurel SpA According to the shareholders’ agreement, the Company has an obligation to purchase the shares at the agreed yield-based transfer price on the agreed date of exercise and when Sprott Chile Solar I SpA intends to sell its shares. (xii) Hyundai Green Power Co., Ltd. As of December 31, 2022, the Company has call option against the financial investors (IBK and others) and also has an obligation to sell its shares in Hyundai Green Power Co., Ltd. when claimed by the financial investors at certain period of time in the future. Also, at certain period of time in the future, the Company has put option against Hyundai Steel Company and a third party designated by Hyundai Steel Company (collectively, “Hyundai Steel Group”), the operating investor of Hyundai Green Power Co., Ltd., according to the conditions of the agreement and also has an obligation to sell its shares upon request from Hyundai Steel Group. (xiii) Kosture Co., Ltd. The Company acquires the shares with the settled amount of coal provided to Kosture Co., Ltd. every year until completion of the subscription set forth in the shareholders’ agreement. (xiv) Omisan Wind Power Co., Ltd. When the Company requests Unison Co., Ltd. to transfer shares after the completion of the power generation complex, the Company has a right to purchase the shares or transfer them to others at fair value. (xv) Geumsungsan Wind Power Co., Ltd. The Company has a right to purchase shares owned by Daemyung Energy Co., Ltd., within the range of 18%, for 3 years after the commencement of the operation. (xvi) Seungmun Green Energy According to the special conditions of the REC trading contract, a connected entity may demand the sale of ownership stakes held by other investors to the connected entity, or the investors may acquire new stakes or modify business documents through a capital increase in Seokmun Green Energy with prior written consent from the trustee. In the event that other investors sell their stakes to the connected entity, they may demand that the connected entity purchase their stakes in the future if certain conditions are met.
Summary of Significant Restrictions on its Abilities to Associates or Joint Ventures	(8) Significant restrictions on the Company’s abilities on associates or joint ventures as of December 31, 2022 are as follows: Company Nature and extent of any significant restrictions Daegu Green Power Co., Ltd. Dividends can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions is obtained. Shares cannot be wholly or partially transferred without prior written consent of financial institutions. Pyeongchang Wind Power Co., Ltd. Principals and interests on subordinated loans or dividends can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions is obtained. Shares cannot be wholly or partially transferred without prior consent of the stakeholders. Daeryun Power Co., Ltd. Principals and interests on subordinated loans or dividends can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions. Shares cannot be wholly or partially transferred without prior consent of the majority of major stakeholders. KNH Solar Co., Ltd. Principals and interests on subordinated loans or dividends to shareholders cannot be paid without written consent of financial institutions. Also, shares cannot be wholly or partially transferred without the consent of other shareholders. Korea Power Engineering Service Co., Ltd. Shares cannot be wholly or partially transferred without the consent of the board of directors. Daehan Wind Power PSC Dividends can only be paid when all conditions of the loan agreement are satisfied. Also, shares cannot be wholly or partially transferred without the consent of the stakeholders. Daejung Offshore Wind Power Co., Ltd. Before the commencement of the operation, shares cannot be wholly or partially transferred without the consent of the stakeholders. Naepo Green Energy Co., Ltd. Dividends can only be paid when all conditions of the loan agreement are satisfied. Also, shares cannot be wholly or partially transferred without the consent of the stakeholders. Solaseado Solar Power Co., Ltd. Dividends can only be paid when all conditions of the shareholder’s agreement are satisfied. Also, shares cannot be wholly or partially transferred without the consent of the stakeholders. Samcheok Eco Materials Co., Ltd. Dividends can only be paid when all conditions of the shareholder’s agreement are satisfied. Also, shares cannot be wholly or partially transferred without the consent of the stakeholders. Taebaek Guinemi Wind Power Co., Ltd. Dividends can only be paid when all conditions of the shareholder’s agreement are satisfied. Also, shares cannot be wholly or partially transferred without the consent of the stakeholders. Indeck Niles Asset Management, LLC Shares cannot be wholly or partially transferred without the consent of the stakeholders. Indeck Niles Development, LLC Shares cannot be wholly or partially transferred without the consent of the stakeholders. Chester Solar IV SpA Dividends can only be paid when all conditions of the loan agreement are satisfied. Also, shares cannot be wholly or partially transferred without the consent of the stakeholders. Chester Solar V SpA Dividends can only be paid when all conditions of the loan agreement are satisfied. Also, shares cannot be wholly or partially transferred without the consent of the stakeholders. Diego de Almagro Solar Spa Dividends can only be paid when all conditions of the loan agreement are satisfied. Also, shares cannot be wholly or partially transferred without the consent of the stakeholders. Laurel SpA Dividends can only be paid when all conditions of the loan agreement are satisfied. Also, shares cannot be wholly or partially transferred without the consent of the stakeholders. Chester Solar I SpA Dividends can only be paid when all conditions of the loan agreement are satisfied. Also, shares cannot be wholly or partially transferred without the consent of the stakeholders. Kelar S.A. Dividends can only be paid when all conditions of the loan agreement are satisfied. Also, shares cannot be wholly or partially transferred without the consent of the stakeholders. GS Donghae Electric Power Co., Ltd. Dividends can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions is obtained. Busan Shinho Solar Power Co., Ltd. Dividends can only be paid when all conditions of the loan agreement are satisfied. Honam Wind Power Co., Ltd. Dividends and settlement amount for renewable energy certificate can only be paid when all conditions of the loan agreement are satisfied. Company Nature and extent of any significant restrictions Seokmun Energy Co., Ltd. Dividends can only be paid when all conditions of the loan agreement are satisfied and prior written consent of financial institutions is obtained. Also, principals and interests on subordinated loans can only be paid when written consent of financial institutions is obtained. Chun-cheon Energy Co., Ltd. Dividends can only be paid when all conditions of the loan agreement are satisfied. Also, principals and interests on subordinated loans shall not be paid until the payment conditions are satisfied. Yeonggwangbaeksu Wind Power Co., Ltd. Dividends and settlement amount for renewable energy certificate can only be paid when all conditions of the loan agreement are satisfied and prior written consent of financial institutions is obtained. Also, principals and interests on subordinated loans can only be paid when written consent of financial institutions is obtained. Yeonggwang Wind Power Co., Ltd. Dividends and settlement amount for renewable energy certificate can only be paid when all conditions of the loan agreement are satisfied and prior written consent of financial institutions is obtained. Jamaica Public Service Company Limited Dividends can only be paid when all conditions of the loan agreement are satisfied and prior written consent of financial institutions is obtained. PT. Tanjung Power Indonesia Dividends can only be paid when all conditions of the loan agreement are satisfied. DE Energia SpA Dividends can only be paid when all conditions of the loan agreement are satisfied. Daesan Green Energy Co., Ltd. Dividends and settlement amount for renewable energy certificate can only be paid when all conditions of the loan agreement are satisfied and prior written consent of financial institutions is obtained. Taebaek Gadeoksan Wind Power Co., Ltd. Dividends and settlement amount for renewable energy certificate can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions is obtained. Also, principals and interests on subordinated loans can only be paid when prior written consent of financial institutions is obtained. Bitsolar Energy Co., Ltd. Dividends can only be paid when all conditions of the loan agreement are satisfied. Omisan Wind Power Co., Ltd. Principals and interests on subordinated loans or dividends can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions is obtained. Also, either of Omisan Wind Power Co., Ltd. and Unison Co., Ltd. shall not transfer their shares to others wholly or partially until 4 years have passed from the completion of power complex without the written consent from the other party. In case the shares of each party becomes less than 10% of outstanding shares after the transfer, it also requires the written consent from the other party. Yangyang Wind Power Co., Ltd. Dividends can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions is obtained. Busan Industrial Solar Power Co., Ltd. Dividends can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions is obtained. Kosture Co., Ltd. Shares cannot be wholly or partially transferred without the consent of the stakeholders. Geumsungsan Wind Power Co., Ltd. Dividends can only be paid when all conditions of the loan agreement are satisfied. Shares cannot be wholly or partially transferred for 3 years after the commencement of operation, and also cannot be transferred or disposed to the third party in a way not permitted in the financial documents without prior written consent of an agent bank. Daewon Green Energy Co., Ltd. Dividends can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions is obtained. Cheongju Eco Park Co., Ltd. Dividends and settlement amounts for renewable energy certificate can only be paid when all conditions of the loan agreement are satisfied, or permitted by related financing contracts, or prior written consent of financial institutions is obtained. Goheung New Energy Co., Ltd. Payment of dividends or repayment of loans such as subordinated loans to the investors can only be made when all conditions of the loan agreement are satisfied and prior written consent of financial institutions is obtained. Seungmun Green Energy Dividends and settlement amount for renewable energy certificate can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions is obtained.

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2022
Disclosure of detailed information about property, plant and equipment [abstract]
Summary of Property, Plant and Equipment	(1) Property, plant and equipment as of December 31, 2021 and 2022 are as follows: 2021 Acquisition cost Government grants Accumulated depreciation Accumulated losses Book value In millions of won Land ￦ 14,135,452 (23,474 ) — (27,487 ) 14,084,491 Buildings 22,974,569 (52,122 ) (10,041,270 ) (7,073 ) 12,874,104 Structures 78,474,620 (172,021 ) (30,171,363 ) (13,205 ) 48,118,031 Machinery 101,062,220 (140,082 ) (48,791,847 ) (514,991 ) 51,615,300 Ships 2,068 — (1,891 ) — 177 Vehicles 371,207 (1,675 ) (281,833 ) (117 ) 87,582 Equipment 1,989,115 (149 ) (1,591,890 ) (42 ) 397,034 Tools 1,256,189 (64 ) (1,073,086 ) (38 ) 183,001 Construction-in-progress 30,313,624 (111,822 ) — (157,530 ) 30,044,272 Right-of-use 7,848,138 — (3,788,741 ) — 4,059,397 Asset retirement costs 14,348,920 — (5,277,109 ) (146,423 ) 8,925,388 Others 14,852,245 — (12,106,384 ) — 2,745,861 ￦ 287,628,367 (501,409 ) (113,125,414 ) (866,906 ) 173,134,638 2022 Acquisition cost Government grants Accumulated depreciation Accumulated losses Book value In millions of won Land ￦ 14,298,409 (27,405 ) — (27,472 ) 14,243,532 Buildings 24,230,827 (50,437 ) (10,931,672 ) (6,955 ) 13,241,763 Structures 83,055,890 (165,608 ) (32,596,265 ) (10,390 ) 50,283,627 Machinery 108,749,243 (127,126) (54,015,594 ) (541,864 ) 54,064,659 Ships 17,264 — (3,788 ) — 13,476 Vehicles 393,046 (2,045 ) (305,242 ) (117 ) 85,642 Equipment 2,168,348 (6,608 ) (1,732,564 ) (43 ) 429,133 Tools 1,306,509 (99 ) (1,128,002 ) (6 ) 178,402 Construction-in-progress 28,064,266 (135,926 ) — (22,795 ) 27,905,545 Right-of-use 5,992,724 — (2,281,599 ) — 3,711,125 Asset retirement costs 17,620,603 — (6,185,214 ) (146,422 ) 11,288,967 Others 15,520,160 — (13,100,723 ) — 2,419,437 ￦ 301,417,289 (515,254) (122,280,663 ) (756,064) 177,865,308
Summary of Changes in Property, Plant and Equipment	(2) Changes in property, plant and equipment for the years ended December 31, 2021 and 2022 are as follows: 2021 Beginning Acquisition Disposal Depreciation Impairment Others Ending balance In millions of won Land ￦ 13,943,326 9,561 (54,447 ) — — 209,525 14,107,965 (Government grants) (23,475 ) — 1 — — — (23,474 ) Buildings 12,616,532 9,036 (19,974 ) (889,539 ) — 1,210,171 12,926,226 (Government grants) (57,231 ) — — 5,174 — (65 ) (52,122 ) Structures 46,258,855 630 (319,287 ) (2,582,488 ) (741 ) 4,933,083 48,290,052 (Government grants) (180,009 ) — 1,811 9,517 — (3,340 ) (172,021 ) Machinery 50,038,787 268,126 (135,803 ) (5,759,425 ) — 7,343,697 51,755,382 (Government grants) (157,785 ) — 531 17,519 — (347 ) (140,082 ) Ships 255 — — (103 ) — 25 177 Vehicles 78,983 4,807 (4,298 ) (37,980 ) — 47,745 89,257 (Government grants) (632 ) (26 ) — 460 — (1,477 ) (1,675 ) Equipment 407,843 54,875 (667 ) (184,007 ) — 119,139 397,183 (Government grants) (227 ) — — 95 — (17 ) (149 ) Tools 192,387 19,389 (89 ) (81,984 ) — 53,362 183,065 (Government grants) (239 ) — — 209 — (34 ) (64 ) Construction-in-progress 30,964,938 12,183,430 (66,965 ) — (3,315 ) (12,921,994 ) 30,156,094 (Government grants) (79,126 ) 5,027 — — — (37,723 ) (111,822 ) Right-of-use 4,542,166 78,213 (11,787 ) (558,565 ) — 9,370 4,059,397 Asset retirement costs 7,413,171 92 (209 ) (844,518 ) — 2,356,852 8,925,388 Others 2,752,081 5,311 (2,332 ) (869,310 ) — 860,111 2,745,861 ￦ 168,710,600 12,638,471 (613,515 ) (11,774,945 ) (4,056 ) 4,178,083 173,134,638 2022 Beginning Acquisition Disposal Depreciation Impairment Others Ending balance In millions of won Land ￦ 14,107,965 9,535 (49,377 ) — — 202,814 14,270,937 (Government grants) (23,474 ) — 1 — — (3,932 ) (27,405 ) Buildings 12,926,226 3,202 (19,918 ) (906,528 ) (449 ) 1,289,667 13,292,200 (Government grants) (52,122 ) — — 5,360 — (3,675 ) (50,437 ) Structures 48,290,052 217,450 (277,308 ) (2,677,395 ) (3,669 ) 4,900,105 50,449,235 (Government grants) (172,021 ) — 1,250 9,568 — (4,405 ) (165,608 ) Machinery 51,755,382 248,932 (188,924 ) (5,748,407 ) (33,191 ) 8,157,993 54,191,785 (Government grants) (140,082 ) — 405 17,283 — (4,732 ) (127,126 ) Ships 177 — — (1,053 ) — 14,352 13,476 Vehicles 89,257 1,813 (88 ) (41,907 ) — 38,612 87,687 (Government grants) (1,675 ) — — 663 — (1,033 ) (2,045 ) Equipment 397,183 79,369 (183 ) (205,908 ) (1 ) 165,281 435,741 (Government grants) (149 ) — — 494 — (6,953 ) (6,608 ) Tools 183,065 25,291 (180 ) (77,902 ) — 48,227 178,501 (Government grants) (64 ) — — 32 — (67 ) (99 ) Construction-in-progress 30,156,094 11,671,907 (197,293 ) — 134,735 (13,723,972 ) 28,041,471 (Government grants) (111,822 ) 23,155 17 — — (47,276 ) (135,926 ) Right-of-use 4,059,397 197,016 (2,838 ) (509,068 ) — (33,382 ) 3,711,125 Asset retirement costs 8,925,388 — — (1,133,866 ) — 3,497,445 11,288,967 Others 2,745,861 9,028 (22,531 ) (1,036,132 ) — 723,211 2,419,437 ￦ 173,134,638 12,486,698 (756,967) (12,304,766) 97,425 5,208,280 177,865,308 (3) The Company’s subsidiaries including Korea Hydro & Nuclear Power Co., Ltd. have recognized proceeds and costs from selling items produced before its intended use, by accounting ￦94,264 million as revenue and ￦63,405 as expense in profit or loss for the year ended December 31, 2022.

Investment Properties (Tables)

Investment Properties (Tables)	12 Months Ended
	Dec. 31, 2022
Disclosure of detailed information about investment property [abstract]
Summary of Investment Properties	(1) Investment properties as of December 31, 2021 and 2022 are as follows: 2021 Acquisition Government Accumulated Book value In millions of won Land ￦ 201,605 — — 201,605 Buildings 19,543 (30 ) (8,334 ) 11,179 ￦ 221,148 (30 ) (8,334 ) 212,784 2022 Acquisition Government Accumulated Book value In millions of won Land ￦ 194,417 — — 194,417 Buildings 20,241 (21 ) (6,351 ) 13,869 ￦ 214,658 (21 ) (6,351 ) 208,286
Summary of Changes in Investment Properties	(2) Changes in investment properties for the years ended December 31, 2021 and 2022 are as follows: 2021 Beginning Depreciation Others Ending In millions of won Land ￦ 200,391 — 1,214 201,605 Buildings 24,833 (1,387 ) (12,237 ) 11,209 (Government grants) (29 ) 1 (2 ) (30 ) ￦ 225,195 (1,386 ) (11,025 ) 212,784 2022 Beginning Disposal Depreciation Others Ending In millions of won Land ￦ 201,605 (208 ) — (6,980 ) 194,417 Buildings 11,209 — (487 ) 3,168 13,890 (Government grants) (30 ) — 1 8 (21 ) ￦ 212,784 (208 ) (486 ) (3,804 ) 208,286
Summary of Income and Expenses Related to Investment Properties	(3) Income and expenses related to investment properties for the years ended December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Rental income ￦ 10,118 9,775 Operating and maintenance expenses related to rental income (1,386 ) (587 ) ￦ 8,732 9,188
Summary of Fair Value of Investment Properties	(4) Fair value of investment properties as of December 31, 2021 and 2022 are as follows: 2021 2022 Book value Fair value Book value Fair value In millions of won Land ￦ 201,605 268,702 194,417 292,827 Buildings 11,179 13,636 13,869 15,626 ￦ 212,784 282,338 208,286 308,453

Construction Contracts (Tables)

Construction Contracts (Tables)	12 Months Ended
	Dec. 31, 2022
Construction Contracts [Abstract]
Summary of Changes in Total Contract Amount in Which Revenue is Not Yet Recognized	(1) Changes in total contract amount in which revenue is not yet recognized for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 Beginning balance Increase Recognized as revenue Ending In millions of won Nuclear power plant construction in UAE and others ￦ 2,735,141 1,229,759 (812,175 ) 3,152,725 (*) For the year ended December 31, 2020, the increased balance of contracts from new orders is ￦1,512,460 million and the decreased balance of contracts due to changes in scope of construction work and foreign exchange impact is ￦282,701 million. 2021 Beginning balance Increase Recognized as revenue Ending In millions of won Nuclear power plant construction in UAE and others ￦ 3,152,725 386,208 (754,998 ) 2,783,935 (*) For the year ended December 31, 2021, the increased balance of contracts from new orders is ￦458,635 million and the decreased balance of contracts due to changes in scope of construction work and foreign exchange impact is ￦72,427 million. 2022 Beginning balance Increase Recognized as revenue Ending In millions of won Nuclear power plant construction in overseas ￦ 2,783,935 3,457,964 (646,953 ) 5,594,946 (*) For the year ended December 31, 2022, the increased balance of contracts from new orders is ￦3,578,599 million and the decreased balance of contracts due to changes in scope of construction work and foreign exchange impact is ￦81,401 million.
Summary of Accumulated Earned Revenue, Expense and Others	(2) Accumulated earned revenue, expense and others related to the Company’s construction contracts in progress as of December 31, 2021 and 2022 are as follows: 2021 Accumulated earned revenue Accumulated expense Accumulated profit Unearned advance receipts In millions of won Nuclear power plant construction in UAE and others ￦ 22,051,129 20,967,097 1,084,032 23,238 2022 Accumulated earned revenue Accumulated expense Accumulated profit Unearned advance receipts In millions of won Nuclear power plant construction in overseas and others ￦ 22,507,004 21,666,552 840,452 29,877
Summary of Gross Amount of Assets and Liabilities for Contract	(3) Gross amount due from customers recognized as contract assets and due to customers recognized as contract liabilities for contract work as of December 31, 2021 and 2022 are as follows: 2021 2022 Contract Contract Contract Contract In millions of won Nuclear power plant construction in overseas and others ￦ 82,306 5,330 118,983 120,952 (*1) Included in trade and other receivables, net, in the consolidated statements of financial position. The balance of trade receivables from construction contracts are ￦57,639 million and ￦85,757 million, as of December 31, 2021 and 2022, respectively. (*2) Included in non-financial

Intangible Assets other than _2

Intangible Assets other than Goodwill (Tables)	12 Months Ended
	Dec. 31, 2022
Disclosure of detailed information about intangible assets [abstract]
Summary of Intangible Asset Explanatory	(1) Intangible assets as of December 31, 2021 and 2022 are as follows: 2021 Acquisition Government Accumulated Accumulated Book value In millions of won Software ￦ 867,185 (91 ) (704,589 ) — 162,505 Copyrights, patents rights and other industrial rights 103,428 — (59,063 ) (9,178 ) 35,187 Mining rights 623,122 — (39,803 ) (541,417 ) 41,902 Development expenditures 978,768 (3,820 ) (905,805 ) (19 ) 69,124 Intangible assets under development 94,275 (7,326 ) — (12,845 ) 74,104 Usage rights of donated assets and others 592,870 — (423,087 ) — 169,783 Leasehold rights 28,185 — (22,337 ) — 5,848 Greenhouse gas emissions rights 78,137 — — — 78,137 Others 574,957 (71 ) (155,404 ) (11,995 ) 407,487 ￦ 3,940,927 (11,308 ) (2,310,088 ) (575,454 ) 1,044,077 2022 Acquisition Government Accumulated Accumulated Book value In millions of won Software ￦ 1,002,040 (174 ) (799,013 ) (20 ) 202,833 Copyrights, patents rights and other industrial rights 104,559 — (67,368 ) (9,178 ) 28,013 Mining rights 625,845 — (46,187 ) (541,133 ) 38,525 Development expenditures 938,032 (3,477 ) (883,527 ) — 51,028 Intangible assets under development 76,625 (2,108 ) — (8,903 ) 65,614 Usage rights of donated assets and others 592,797 — (435,518 ) (136 ) 157,143 Leasehold rights 28,185 — (23,297 ) — 4,888 Greenhouse gas emissions rights 43,960 — — — 43,960 Others 551,396 (67 ) (174,714 ) (11,955 ) 364,660 ￦ 3,963,439 (5,826 ) (2,429,624 ) (571,325 ) 956,664
Summary of Changes in Intangible Assets	(2) Changes in intangible assets for the years ended December 31, 2021 and 2022 are as follows: 2021 Beginning Acquisition Disposal Amortization Reversal Others Ending In millions of won Software ￦ 152,163 18,834 (1 ) (77,881 ) — 69,481 162,596 (Government grants) (136 ) — — 64 — (19 ) (91 ) Copyrights, patents rights and other industrial rights 42,916 166 (131 ) (7,771 ) — 7 35,187 Mining rights 42,390 1,022 — (3,526 ) — 2,016 41,902 Development expenditures 95,166 309 — (37,033 ) — 14,502 72,944 (Government grants) (5,043 ) — — 1,439 — (216 ) (3,820 ) Intangible assets under development 67,018 51,988 — — — (37,576 ) 81,430 (Government grants) (7,203 ) — — — — (123 ) (7,326 ) Usage rights of donated assets and others 184,475 — — (13,594 ) — (1,098 ) 169,783 Leasehold rights 6,340 — — (834 ) — 342 5,848 Greenhouse gas emissions rights 61,373 78,091 — (31 ) — (61,296 ) 78,137 Others 416,346 2,229 — (26,998 ) 14 15,967 407,558 (Government grants) (75 ) — — 4 — — (71 ) ￦ 1,055,730 152,639 (132 ) (166,161 ) 14 1,987 1,044,077 2022 Beginning Acquisition Disposal Amortization Impairment Others Ending In millions of won Software ￦ 162,596 22,532 (57 ) (84,649 ) — 102,585 203,007 (Government grants) (91 ) — — 60 — (143 ) (174 ) Copyrights, patents rights and other industrial rights 35,187 270 (37 ) (7,136 ) — (271 ) 28,013 Mining rights 41,902 2,395 — (4,296 ) — (1,476 ) 38,525 Development expenditures 72,944 — — (24,238 ) — 5,799 54,505 (Government grants) (3,820 ) — — 1,466 — (1,123 ) (3,477 ) Intangible assets under development 81,430 39,559 — — (14 ) (53,253 ) 67,722 (Government grants) (7,326 ) — — — — 5,218 (2,108 ) Usage rights of donated assets and others 169,783 — — (11,394 ) (150 ) (1,096 ) 157,143 Leasehold rights 5,848 — — (960 ) — — 4,888 Greenhouse gas emissions rights 78,137 57,466 — — — (91,643 ) 43,960 Others 407,558 4,073 (260 ) (25,017 ) — (21,627 ) 364,727 (Government grants) (71 ) — — 4 — — (67 ) ￦ 1,044,077 126,295 (354 ) (156,160 ) (164 ) (57,030 ) 956,664
Summary of Significant Specific Intangible Assets	(3) Significant specific intangible assets as of December 31, 2021 and 2022 are as follows: 2021 Type Description Currency Amount Remaining useful lives In millions of won and thousands of Australian dollars Software DAS MS-SQL KRW 3,817 2 years and 8 months Copyrights, patents rights and other industrial rights Smart technology verification and standard design project conducting right KRW 1,851 9 months Contributions to AP R KRW 25,045 6 years Mining rights Mining rights of Bylong mine AUD — — (*) Usage rights of donated assets and others Sejong Haengbogdosi sharing charge KRW 22,310 4 years and 11 months Right of use electricity and gas supply facility (Community district of Songdo) KRW 8,962 8 years and 6 months Others Occupancy and use of public waters KRW 81,623 15 years and 1 month Greenhouse gas emissions rights KRW 78,137 — Business rights KRW 160,459 27 years and 11 months (*)   The carrying amount of mining rights is nil, because KEPCO Australia Pty., Ltd. and KEPCO Bylong Australia Pty., Ltd. had recognized impairment losses in full. 2022 Type Description Currency Amount Remaining useful lives In millions of won and thousands of Australian dollars Software ORACLE license for SDIS integrated DB KRW 5,509 3 years and 4 months Copyrights, patents rights and other industrial rights Contributions to APR NRC DC KRW 20,871 5 years Mining rights Mining rights of Bylong mine AUD — — (*) Usage rights of donated assets and others Sejong Haengbogdosi sharing charge KRW 17,772 3 years and 11 months Right of use electricity and gas supply facility (Community district of Songdo) KRW 7,908 7 years and 6 months Others Occupancy and use of public waters KRW 76,212 14 years and 1 month Greenhouse gas emissions rights KRW 43,960 — Business rights KRW 154,712 26 years and 11 months (*) The carrying amount of mining rights is nil, because KEPCO Australia Pty., Ltd. and KEPCO Bylong Australia Pty., Ltd. had recognized impairment losses in full.
Summary of Recognized Research and Development Expenses	(4) For the years ended December 31, 2020, 2021 and 2022, the Company recognized research and development expenses of 700,642 million, 689,397 million and 727,810

Trade and Other Payables (Table

Trade and Other Payables (Tables)	12 Months Ended
	Dec. 31, 2022
Trade and other payables [abstract]
Summary of Trade and Other Payables Explanatory	Trade and other payables as of December 31, 2021 and 2022 are as follows: 2021 2022 Current Non-current Current Non-current In millions of won Trade payables ￦ 4,780,260 — 7,529,857 — Non-trade 1,536,976 2,032,260 2,132,838 2,023,985 Accrued expenses 1,174,765 8,095 1,605,118 6,351 Leasehold deposits received 1,699 741 2,479 35 Other deposits received 72,063 68,050 97,408 47,863 Lease liabilities 583,558 3,826,945 614,037 3,549,106 Dividends payable 4,105 — 1,812 — Others(*) — 60,407 — 11,574 ￦ 8,153,426 5,996,498 11,983,549 5,638,914 (*) Details of others as of December 31, 2021 and 2022 are as follows: 2021 2022 Current Non-current Current Non-current In millions of won Advance received from local governments ￦ — 3,477 — 3,477 Others — 56,930 — 8,097 ￦ — 60,407 — 11,574

Borrowings and Debt Securities

Borrowings and Debt Securities (Tables)	12 Months Ended
	Dec. 31, 2022
Disclosure of detailed information about borrowings [abstract]
Summary of Borrowings And Debt Securities	(1) Borrowings and debt securities as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Current liabilities Short-term borrowings ￦ 2,920,563 8,820,425 Current portion of long-term borrowings 1,463,703 3,638,202 Current portion of debt securities 9,652,986 10,205,395 Less : Current portion of discount on long-term borrowings (2,048 ) (774 ) Less : Current portion of discount on debt securities (5,370 ) (4,246 ) 14,029,834 22,659,002 Non-current Long-term borrowings 2,278,481 2,977,268 Debt securities 64,385,784 95,160,920 Less : Discount on long-term borrowings (12,857 ) (14,945 ) Less : Discount on debt securities (152,760 ) (177,543 ) Add: Premium on debt securities 1,031 663 66,499,679 97,946,363 ￦ 80,529,513 120,605,365
Repayment Schedule of Borrowings and Debt Securities	(2) Repayment schedule of borrowings and debt securities as of December 31, 2021 and 2022 are as follows: 2021 Type Borrowings Debt Securities In millions of won Less than 1 year ￦ 4,384,266 9,652,986 1~ 5 years 1,013,500 34,156,038 Over 5 years 1,264,981 30,229,746 ￦ 6,662,747 74,038,770 2022 Type Borrowings Debt Securities In millions of won Less than 1 year ￦ 12,458,627 10,205,395 1~ 5 years 1,472,655 65,278,587 Over 5 years 1,504,613 29,882,333 ￦ 15,435,895 105,366,315
Short-term Borrowings	(3) Short-term borrowings as of December 31, 2021 and 2022 are as follows: 2021 Type Creditor Interest rate (%) Maturity Foreign currency Local currency In millions of won and thousands of foreign currencies Local short-term borrowings DB financial investment and others 1.96~4.60 2022.01.07 ~2022.12.31 — ￦ 2,030,886 Electronic short-term bonds BNK Securities and others 1.35~1.77 2022.01.21 ~2022.02.08 — 100,000 Foreign short-term borrowings Shinhan Bank and others 0.34~0.45 2022.01.04 ~2022.03.30 USD 157,533 186,755 Foreign short-term borrowings Korea Development Bank and others 1M Libor + 1.25 2022.04.29 USD 173,042 205,142 Foreign short-term borrowings Shinhan Bank and others 0.57~0.80 2022.06.17 ~2022.08.31 USD 78,319 92,847 Foreign short-term borrowings Credit Agricole and others 0.04 2022.06.28 EUR 72,199 96,915 Local bank overdraft Korea Development Bank and others 1.73~2.25 2022.01.07 ~2022.02.26 — 208,018 ￦ 2,920,563 2022 Type Creditor Interest rate (%) Maturity Foreign currency Local currency In millions of won and thousands of USD Local short-term borrowings DB financial investment and others 3.21~5.80 2023.01.02 ~2023.12.31 — ￦ 5,549,120 Local short-term borrowings Nonghyup Bank and others 3M CD + 1.11~1.70 2023.05.25 ~2023.11.24 — 3,000,000 Local short-term borrowings Shinhan Bank 6M Bank 2023.11.17 — 50,000 Local short-term borrowings Korea Development Bank 4.15 2023.01.06 — 3,400 Foreign short-term borrowings Shinhan Bank 5.19 2023.02.28 USD 12,045 15,264 Foreign short-term borrowings Shinhan Bank SOFR(1M) + 0.65 2023.02.27 USD 40,000 50,692 Foreign short-term borrowings Kookmin Bank and others 3.32~5.88 2023.01.09 ~2023.06.12 USD 91,796 116,333 Local bank overdraft Woori Bank and others Standard overdraft 4.83 2023.01.06 ~2023.02.24 — 35,616 ￦ 8,820,425
Long-term Borrowings	(4) Long-term borrowings as of December 31, 2021 and 2022 are as follows: 2021 Type Interest rate (%) Maturity Foreign currency Local currency In millions of won and thousands of foreign currencies Local long-term borrowings Korea Development Bank Others 0.50 2023~2044 — ￦ 2,509 Facility 2.50~4.60 2022~2028 — 39,430 Operating funds 2.33 2022 — 20,000 Operating funds 1yr KDB bond rate + 0.81~0.95 2022~2023 — 64,300 Hana Bank Commercial Paper 3M CD+0.13~0.43 2022~2025 — 1,050,000 Facility 4.60 2028 — 9,647 Facility 3yr KTB rate-1.25 2022~2028 — 4,485 IBK PF Refinancing CD+1.25 2030 — 8,589 Export-Import Bank of Korea Project loans 1.50 2026 — 13,258 Facility 1.32 2028 — 32,000 Operating funds 1.78 2023 — 15,700 Korea Energy Agency Development of power resources 3yr KTB rate-2.25 2023~2025 — 8,971 Facility 3yr KTB rate-2.25 2022~2024 — 995 Project loans — 2023 — 1,197 Others 1.75 2028 — 4,893 Shinhan Bank and others Facility CB rate+1.10 2028 — 14,470 Commercial Paper 3M CD+0.38 2025 — 150,000 Others 3.95 2034 — 84,179 Others Standard overdraft rate+1.00 2034 — 84,179 Kookmin Bank Facility MOR+0.79 3M CD+1.79 2022~2031 — 59,333 Others Facility 2.80~6.80 2024~2039 — 620,185 Facility CB rate+0.90~1.10 3M CD+1.60 3.37 2028~2037 — 171,733 PF Refinancing 3.80~5.00 2030~2034 — 71,742 PF Refinancing 1.75 2029 — 22,265 Others 4.40~7.90 2022~2038 — 116,367 Others 1.80~4.50 2031~2034 — 49,928 2,720,355 Foreign long-term borrowings Korea Energy Agency Project loans — 2026 USD 8,744 10,366 Export-Import Bank of Korea and others Direct loan and others 1M Libor+1.80~3.20 2036 USD 89,823 106,485 Direct loan and others 3M Libor+2.75~3.70 2027 JOD 107,868 180,363 PF Loan 6M Libor+1.70~2.50 2032 USD 103,340 122,509 POSCO and others Shareholder’s loan 8.00 2025 USD 11,953 14,171 Shareholder’s loan 8.00 2031 JOD 4,853 8,114 Samsung Life Insurance and others Syndicated Loan 3.10~8.00 2032 JPY 5,144,387 53,000 Woori Bank and others Syndicated Loan JPY 6M Libor+2.00 2032 JPY 2,820,708 29,060 KiwoomSolar Power Professional Investor Private Placement Investment Trust V Senior borrowing 3.90 2029 EUR 36,311 48,741 IFC and others Others 6M Libor+5.00 2031 USD 230,018 272,686 Federal Financing Bank and others PF Loan 2.39~6.00 2031~2038 USD 94,135 111,597 Others Others — — USD 54,607 64,737 1,021,829 3,742,184 Less: Discount on long-term borrowings (14,905 ) Less: Current portion of long-term borrowings (1,463,703 ) Add: Current portion of discount on long-term borrowings 2,048 ￦ 2,265,624 2022 Type Interest rate (%) Maturity Foreign currency Local currency In millions of won and thousands of foreign currencies Local long-term borrowings Korea Development Bank Others 0.50 2023~2044 — ￦ 2,133 Facility 2.50~4.60 2023~2028 — 28,420 Facility CB rate+0.90 2029 — 9,985 Operating funds 1yr KDB rate+0.81~0.91 2023~2024 — 54,300 Hana Bank and others Commercial Paper 3M CD+0.13~1.20 2023~2027 — 3,250,000 Facility 4.60 2028 — 8,137 Facility 3yr KTB rate-1.50 2028 — 3,821 Export-Import Bank of Korea Project loans 1.50 2026 — 10,312 Facility 1.32 2028 — 58,100 Operating funds 1.78 2023 — 15,700 Korea Energy Agency Development of power resources 3yr KTB rate-2.25 1.50~1.75 2023~2028 — 11,175 Facility 3yr KTB rate-2.50 2023~2024 — 393 Project loans — 2023~2027 — 1,197 Shinhan Bank and others Facility CB rate+0.90~1.10 2028~2029 — 19,195 Commercial Paper 3M CD+0.38 2025 — 150,000 Others 3.95 2034 — 78,905 Others Standard overdraft rate+1.00 2034 — 78,905 Kookmin Bank Facility MOR+0.79 2023~2035 — 105,155 Others 4.00 2025 — 20,700 Woori Bank Facility 3M Libor+1.90 5.04 2035~2042 — 48,823 Others Facility 3.50~6.80 2028~2044 — 690,259 Facility CB rate+1.10 1.75~4.56 2024~2036 — 103,131 PF Refinancing CB rate+1.25 2030 — 7,634 PF Refinancing 4.10 2030 — 21,206 Securitized debts (*) 3M CD+1.80 2025 — 33,476 Others 4.40~7.90 2023~2039 — 120,217 Others 1.80~4.50 2031~2034 — 49,929 4,981,208 Foreign long-term borrowings Korea Energy Agency Project loans — 2026 USD 8,744 11,081 Export-Import Bank of Korea and others Direct Loan and others 6M Libor+3.20 2036 USD 78.094 98,969 Direct Loan and others 3M Libor+2.25~3.70 2027 JOD 91,051 162,692 Facility 6M Libor+1.70~2.50 SOFR(3M) +1.83 2039~2032 USD 132,168 167,496 Kookmin Bank and others EBL SOFR(1M)+0.11~0.75 2024 USD 149,592 189,578 Riyad Bank EBL SOFR(3M)+1.20 2025 USD 49,870 63,201 POSCO and others Shareholder’s loan 8.00 2025 USD 10,005 12,680 Shareholder’s loan 8.00 2031 JOD 4,853 8,671 Samsung Life Insurance and others Syndicated Loan 3.10~8.00 2032 JPY 4,752,934 45,304 Woori Bank and others Syndicated Loan JPY 6M Libor+1.84 2032 JPY 2,613,385 24,910 Solar Construction Lendings, LLC Facility 5.00 2025 USD 31,140 39,464 KiwoomSolar Power Professional Investor Private Placement Senior borrowing 3.90 2029 EUR 40,531 54,765 IFC and others Others 6M Libor+5.00 SOFR(3M)+1.83~1.99 5.41~6.19 2028~2031 USD 408,408 517,575 2022 Type Interest rate (%) Maturity Foreign currency Local currency In millions of won and thousands of foreign currencies Hanwha US Solar Private Fund and others PF Refinancing 3.00 2038 USD 58,308 73,894 DBS Bank and others Facility 1M BBSY+1.40~2.25 2025 AUD 190,860 163,836 Others Others — — USD 116 146 1,634,262 6,615,470 Less: Discount on long-term borrowings (15,719 ) Less: Current portion of long-term borrowings (3,638,202 ) Add: Current portion of discount on long-term borrowings 774 ￦ 2,962,323 (*) The main reasons for early repayment of securitized debts as of December 31, 2022 are as follows:
Local Debt Securities	(5) Local debt securities as of December 31, 2021 and 2022 are as follows: Issue date Maturity Interest rate (%) 2021 2022 In millions of won Electricity Bonds 2012.03.27~2022.12.28 2023.01.11~2052.04.21 1.14~5.99 ￦ 34,080,000 61,190,000 Corporate Bonds (*) 2009.10.16~2022.12.20 2023.01.11~2052.08.24 1.01~6.06 28,194,472 29,293,188 Corporate Bonds 2021.05.26 2041.05.25 2.00 — 11,578 62,274,472 90,494,766 Less: Discount on local debt securities (52,723 ) (56,924 ) Less: Current portion of local debt securities (7,432,647 ) (8,401,619 ) Add: Current portion of discount on local debt securities 2,510 2,344 ￦ 54,791,612 82,038,567 (*) Among the corporate bonds, each holder of Hee Mang Sunlight Power Co., Ltd.’s private equity bonds, amounting to ￦1,619 million, may exercise the early redemption rights on the 5th year (March 31, 2021) from the date of issuance of the bonds and every year on March 31 thereafter, until the year before the redemption date.
Foreign Debt Securities	(6) Foreign debt securities as of December 31, 2021 and 2022 are as follows: 2021 Type Issue date Maturity Interest rate (%) Foreign currency Local currency In millions of won and thousands of foreign currencies FY-96 1996.04.01~1996.12.06 2026.12.01~2096.04.01 6.00~7.95 USD 278,701 ￦ 330,400 FY-97 1997.01.31~1997.08.04 2027.02.01~2027.08.01 6.75~7.00 USD 314,717 373,097 FY-04 2004.04.23 2034.04.23 5.13 USD 286,920 340,144 FY-12 2012.09.19 2022.09.19 3.00 USD 750,000 889,125 FY-14 2014.07.30 2029.07.30 3.57 USD 100,000 118,550 FY-15 2015.06.15 2025.06.15 3.25 USD 300,000 355,650 FY-17 2017.06.19~2017.07.25 2022.06.19~2027.07.25 2.63~3.13 USD 800,000 948,400 FY-17 2017.10.30 2037.10.30 1.70 EUR 40,000 53,694 FY-17 2017.11.16 2037.11.16 2.36 SEK 450,000 58,968 FY-18 2018.03.13 2028.03.13 3.35 HKD 1,650,000 250,850 FY-18 2018.06.07~2018.07.25 2023.06.07~2023.07.25 3.75~3.88 USD 1,400,000 1,659,700 FY-19 2019.01.22~2019.06.24 2022.01.22~2024.06.24 2.50~3.38 USD 800,000 948,400 FY-19 2019.02.27 2024.02.27 0.13 CHF 200,000 259,494 FY-19 2019.07.19 2024.07.19~2027.07.19 0.00~0.05 CHF 300,000 389,241 FY-19 2019.07.22 2022.07.22 2.38 USD 300,000 355,650 FY-19 2019.10.30 2024.10.30 3M BBSW+0.97 AUD 300,000 257,667 FY-19 2019.12.19 2037.12.31 3.30~5.70 USD 371,947 440,943 FY-20 2020.02.03 2025.02.03 2.13 USD 300,000 355,650 FY-20 2020.05.06 2025.05.06 1.75 USD 500,000 592,750 FY-20 2020.06.15 2025.06.15 1.13 USD 500,000 592,750 FY-20 2020.08.03 2026.02.03 0.61 USD 300,000 355,650 FY-21 2021.01.27 2026.01.27 0.75 USD 450,000 533,475 FY-21 2021.04.27 2026.04.27 1.25 USD 500,000 592,750 FY-21 2021.08.09 2026.08.09 1.25 USD 300,000 355,650 FY-21 2021.09.24 2026.09.24 1.13 USD 300,000 355,650 11,764,298 Less: Discount on foreign debt securities (105,407 ) Add: Premium on foreign debt securities 1,031 Less: Current portion of foreign debt securities (2,220,339 ) Add: Current portion of discount on foreign debt securities 2,860 ￦ 9,442,443 2022 Type Issue date Maturity Interest rate (%) Foreign currency Local currency In millions of won and thousands of foreign currencies FY-96 1996.04.01~ 1996.12.06 2026.12.01~ 2096.04.01 6.00~7.95 USD 278,701 ￦ 353,198 FY-97 1997.01.31~1997.08.04 2027.02.01~2027.08.01 6.75~7.00 USD 314,717 398,841 FY-04 2004.04.23 2034.04.23 5.13 USD 286,920 363,614 FY-14 2014.07.30 2029.07.30 3.57 USD 100,000 126,730 FY-15 2015.06.15 2025.06.15 3.25 USD 300,000 380,190 FY-17 2017.07.25 2027.07.25 3.13 USD 300,000 380,190 FY-17 2017.10.30 2037.10.30 1.70 EUR 40,000 54,048 FY-17 2017.11.16 2037.11.16 2.36 SEK 450,000 54,527 FY-18 2018.03.13 2028.03.13 3.35 HKD 1,650,000 268,208 FY-18 2018.06.07~2018.07.25 2023.06.07~2023.07.25 3.75~3.88 USD 1,400,000 1,774,220 FY-19 2019.02.27 2024.02.27 0.13 CHF 200,000 274,574 FY-19 2019.06.24 2024.06.24 2.50 USD 500,000 633,650 FY-19 2019.07.19 2024.07.19~2027.07.19 0.00~0.05 CHF 300,000 411,861 FY-19 2019.10.30 2024.10.30 3M BBSW+0.97 AUD 300,000 257,523 FY-19 2019.12.19 2037.12.31 3.30~5.70 USD 360,899 457,368 FY-20 2020.02.03 2025.02.03 2.13 USD 300,000 380,190 FY-20 2020.05.06 2025.05.06 1.75 USD 500,000 633,650 FY-20 2020.06.15 2025.06.15 1.13 USD 500,000 633,650 FY-20 2020.08.03 2026.02.03 1.00 USD 300,000 380,190 FY-21 2021.01.27 2026.01.27 0.75 USD 450,000 570,285 FY-21 2021.04.27 2026.04.27 1.25 USD 500,000 633,650 FY-21 2021.08.09 2026.08.09 1.25 USD 300,000 380,190 FY-21 2021.09.24 2026.09.24 1.13 USD 300,000 380,190 FY-22 2022.04.21 2027.04.21 3.63 USD 300,000 380,190 FY-22 2022.05.06 2025.05.06 3.60 USD 500,000 633,650 FY-22 2022.06.14 2025.06.14~2027.06.14 3.63~4.00 USD 800,000 1,013,840 FY-22 2022.06.28 2025.06.28 4.13 USD 300,000 380,190 FY-22 2022.07.27 2027.07.27 4.25 USD 700,000 887,110 FY-22 2022.10.06 2026.04.06~2028.04.06 5.38~5.50 USD 800,000 1,013,840 FY-22 2022.10.06~2022.11.01 2032.10.06 5.16 HKD 2,350,000 381,992 14,871,549 Less: Discount on foreign debt securities (124,865 ) Add: Premium on foreign debt securities 663 Less: Current portion of foreign debt securities (1,803,776 ) Add: Current portion of discount on foreign debt securities 1,902 ￦ 12,945,473
Schedule of Changes in Borrowings and Debt Securities	(7) Changes in borrowings and debt securities for the years ended December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Beginning balance ￦ 69,724,581 80,529,513 Cash flow 9,653,394 39,193,816 Effect of exchange rate fluctuations 1,001,493 906,877 Others 150,045 (24,841 ) Ending balance ￦ 80,529,513 120,605,365

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2022
Presentation of leases for lessee [abstract]
Summary of Right-of-Use Assets	(2) Right-of-use 2021 Acquisition cost Accumulated depreciation Book value In millions of won Land ￦ 814,795 (162,000 ) 652,795 Buildings 106,823 (43,939 ) 62,884 Structures 26,374 (5,226 ) 21,148 Machinery 1,308 (743 ) 565 Ships 4,217,735 (1,188,516 ) 3,029,219 Vehicles 30,375 (16,757 ) 13,618 Others(*) 2,650,728 (2,371,560 ) 279,168 ￦ 7,848,138 (3,788,741 ) 4,059,397 (*) Including a power purchase agreement (“PPA”) with CGN Yulchon Generation Co., Ltd. 2022 Acquisition cost Accumulated depreciation Book value In millions of won Land ￦ 886,076 (224,277 ) 661,799 Buildings 135,290 (60,434 ) 74,856 Structures 30,879 (6,914 ) 23,965 Machinery 1,737 (902 ) 835 Ships 4,151,460 (1,554,597 ) 2,596,863 Vehicles 35,712 (20,996 ) 14,716 Others(*) 751,570 (413,479 ) 338,091 ￦ 5,992,724 (2,281,599) 3,711,125 (*) Including a power purchase agreement (“PPA”) with CGN Yulchon Generation Co., Ltd.
Summary of Changes in Right-of-Use Assets	(3) Changes in right-of-use 2021 Beginning Increase Depreciation Decrease Others Ending In millions of won Land ￦ 706,579 7,312 (57,231 ) — (3,865 ) 652,795 Buildings 47,222 22,336 (25,780 ) (1,469 ) 20,575 62,884 Structures 20,486 2,198 (1,536 ) — — 21,148 Machinery 695 — (130 ) — — 565 Ships 3,437,363 9,694 (411,291 ) — (6,547 ) 3,029,219 Vehicles 13,525 9,583 (8,162 ) (7 ) (1,321 ) 13,618 Others 316,296 27,090 (54,435 ) (10,311 ) 528 279,168 ￦ 4,542,166 78,213 (558,565 ) (11,787 ) 9,370 4,059,397 2022 Beginning Increase Depreciation Decrease Others Ending In millions of won Land ￦ 652,795 63,654 (41,260 ) — (13,390 ) 661,799 Buildings 62,884 42,399 (30,243 ) (1,042 ) 858 74,856 Structures 21,148 4,256 (1,758 ) — 319 23,965 Machinery 565 429 (159 ) — — 835 Ships 3,029,219 — (393,677 ) — (38,679 ) 2,596,863 Vehicles 13,618 13,475 (8,673 ) (962 ) (2,742 ) 14,716 Others 279,168 72,803 (33,298 ) (834 ) 20,252 338,091 ￦ 4,059,397 197,016 (509,068 ) (2,838 ) (33,382 ) 3,711,125
Summary of Lease liabilities	(4) Lease liabilities as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Less than 1 year ￦ 620,121 639,756 1 ~ 5 years 2,158,145 2,047,584 More than 5 years 2,150,722 1,925,012 4,928,988 4,612,352 Less : Discount (518,485 ) (449,209 ) Present value of lease payment ￦ 4,410,503 4,163,143
Summary of Liquidity Classification of Lease Liabilities	(5) The details of the liquidity classification of lease liabilities as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Current lease liabilities ￦ 583,558 614,037 Non-current 3,826,945 3,549,106 ￦ 4,410,503 4,163,143
Summary of Changes in lease liabilities	(6) Changes in lease liabilities for the years ended December 31, 2021 and 2022 are as follows: 2021 Beginning Increase Decrease Interest Others(*) Ending In millions of won Lease liabilities ￦ 4,621,096 73,090 (665,687 ) 93,651 288,353 4,410,503 2022 Beginning Increase Decrease Interest Others(*) Ending In millions of won Lease liabilities ￦ 4,410,503 109,019 (654,236 ) 91,590 206,267 4,163,143 (*) Including translation effect of foreign currency lease liabilities and others.
Summary of Details of Expense Relating to Lease Contracts As Lessee	(7) Details of expense relating to lease contracts as lessee for the years ended December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Depreciation of right-of-use ￦ 558,565 509,068 Interest expenses of lease liabilities 93,651 91,590 Leases expenses for short-term leases 199,490 235,473 Leases expenses for leases of low-value 2,349 3,147 Variable lease payments 54,675 112,158 ￦ 908,730 951,436
Summary of Profit and Loss Related To Finance Lease	(2) Profit and loss related to finance lease for the years ended December 31, 2021 and 2022 2021 2022 In millions of won Finance income on the net investment in the lease ￦ 111,569 122,355
Summary of Maturity Analysis of Finance Lease Payments Receivable	(3) Maturity analysis of the lease payments receivable and reconciliation of the undiscounted lease payments to the net investment in the lease as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Less than 1 year ￦ 172,528 181,930 1 ~ 2 years 163,937 169,693 2 ~ 3 years 158,933 166,787 3 ~ 4 years 156,450 166,196 4 ~ 5 years 155,068 166,965 More than 5 years 1,588,403 1,527,093 2,395,319 2,378,664 Less : Unearned finance income (1,194,627 ) (1,139,274 ) Net investment in the lease(*) ￦ 1,200,692 1,239,390 (*) Including the present value of unguaranteed residual value amounting to ￦19,574 million and ￦22,910 million, as of December 31, 2021 and 2022, respectively.
Summary of Changes in Allowance For Doubtful Accounts of Finance Lease Receivables	(4) Changes in the allowance for doubtful accounts of finance lease receivables for the years ended December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Beginning balance ￦ 990 768 Bad debt expense — 3,737 Reversal of allowance for doubtful accounts (222 ) — Ending balance ￦ 768 4,505

Employment Benefits (Tables)

Employment Benefits (Tables)	12 Months Ended
	Dec. 31, 2022
Disclosure of information about defined benefit plans [abstract]
Summary of Employment Benefits	(1) Employment benefit obligations as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Net defined benefit asset ￦ 20,871 198,626 Net defined benefit obligations 1,675,741 825,927 Other long-term employee benefit obligations 3,417 2,794
Summary of Principal Assumptions on Actuarial Valuation	(2) Principal assumptions used for actuarial valuation as of December 31, 2021 and 2022 are as follows: 2021 2022 Discount rate 2.51%~2.60% 5.16%~5.19% Future salary and benefit levels 4.28% 4.55% Weighted average duration 10.39 years 8.84 years
Summary of Expense Relating to defined Benefit Plans	(3) Details of expense relating to defined benefit plans for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Current service cost ￦ 509,520 524,942 496,722 Interest cost 83,248 91,877 116,256 Expected return on plan assets (42,742 ) (52,782 ) (73,484 ) Past service cost (2,027 ) 5,483 125 Loss from settlement — — — ￦ 547,999 569,520 539,619 Expenses described above are recognized in those items below in the consolidated financial statements. 2020 2021 2022 In millions of won Cost of sales ￦ 397,442 416,287 404,243 Selling and administrative expenses 94,846 95,983 81,457 Others (Construction-in-progress 55,711 57,250 53,919 ￦ 547,999 569,520 539,619
Summary of Defined Benefits	(4) Details of defined benefit obligations as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Present value of defined benefit obligation from funded plans ￦ 4,564,417 3,776,715 Fair value of plan assets (2,909,547 ) (3,149,414 ) Net liabilities incurred from defined benefit plans ￦ 1,654,870 627,301
Summary of Changes in the Present Value of Defined Benefits	(5) Changes in the present value of defined benefit obligations for the years ended December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Beginning balance ￦ 4,570,614 4,564,417 Current service cost 524,942 496,722 Interest cost 91,877 116,256 Remeasurement component (345,755 ) (1,012,727 ) Past service cost 5,483 125 Actual payments (282,794 ) (388,105 ) Others 50 27 Ending balance ￦ 4,564,417 3,776,715
Summary of Changes in the Fair Value of Plan Assets	(6) Changes in the fair value of plan assets for the years ended December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Beginning balance ￦ 2,670,832 2,909,547 Expected return 52,782 73,484 Remeasurement component (8,457 ) (11,609 ) Contributions by the employers 317,707 347,778 Actual payments (123,317 ) (169,786 ) Ending balance ￦ 2,909,547 3,149,414
Summary of the Fair Value of Plan Assets	(7) Details of the fair value of plan assets as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Equity instruments ￦ 344,002 171,301 Debt instruments 744,167 854,640 Bank deposits 407,809 590,103 Others (*) 1,413,569 1,533,370 ￦ 2,909,547 3,149,414 (*) ‘Others’ consist of various financial assets managed by external asset management companies.
Summary of Remeasurement Components Recognized in Other Comprehensive Income (loss)	(8) Remeasurement components recognized in other comprehensive income (loss) for the years ended December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Actuarial gain from changes in financial assumptions ￦ (258,194 ) (967,366 ) Experience adjustments, etc. (87,561 ) (45,361 ) Expected return 8,457 11,609 ￦ (337,298 ) (1,001,118 )

Provisions (Tables)

Provisions (Tables)	12 Months Ended
	Dec. 31, 2022
Disclosure of other provisions [abstract]
Summary of Provisions	(1) Provisions as of December 31, 2021 and 2022 are as follows: 2021 2022 Current Non-current Current Non-current In millions of won Employment benefits Provisions for employment benefits ￦ 1,048,939 — 1,045,058 — Litigation Litigation provisions 26,269 88,449 26,974 154,205 Decommissioning cost Nuclear plants — 19,461,461 — 23,035,427 Spent fuel 457,466 893,196 415,890 1,011,028 Radioactive waste 137,342 1,695,193 94,158 1,895,849 PCBs — 103,665 — 88,359 Other recovery provisions — 30,231 — 32,770 Others Power plant regional support program 146,588 — 144,504 — Transmission regional support program 250,288 — 239,235 — Provisions for financial guarantee 21,032 59,809 22,895 44,345 Provisions for RPS — — 24,339 — Provisions for greenhouse gas emissions obligations 655,544 — 298,876 — Others 102,408 169,420 115,122 102,659 ￦ 2,845,876 22,501,424 2,427,051 26,364,642
Changes in Provisions	(2) Changes in provisions for the years ended December 31, 2021 and 2022 are as follows: 202 1 Beginning Increase in provision Payment Reversal Others Ending balance In millions of won Employment benefits Provisions for employment benefits ￦ 1,024,574 1,048,569 (1,024,212 ) — 8 1,048,939 Litigation Litigation provisions 113,002 67,443 (44,446 ) (15,763 ) (5,518 ) 114,718 Decommissioning cost Nuclear plants 16,974,884 2,545,803 (59,226 ) — — 19,461,461 Spent fuel 1,354,001 452,063 (455,402 ) — — 1,350,662 Radioactive waste 1,891,613 3,862 (51,666 ) (11,274 ) — 1,832,535 PCBs 119,019 2,182 (17,408 ) (128 ) — 103,665 Other recovery provisions 25,840 553 (169 ) — 4,007 30,231 Others Power plant regional support program 144,272 49,596 (47,280 ) — — 146,588 Transmission regional support 96,895 306,409 (153,016 ) — — 250,288 Provisions for financial guarantee 66,354 85,355 (72,109 ) — 1,241 80,841 Provisions for RPS 9,126 445,402 (430,344 ) (24,184 ) — — Provisions for greenhouse gas 393,121 547,911 (235,469 ) (2,174 ) (47,845 ) 655,544 Others 314,535 104,416 (95,541 ) (40,139 ) (11,443 ) 271,828 ￦ 22,527,236 5,659,564 (2,686,288 ) (93,662 ) (59,550 ) 25,347,300 (2) Changes in provisions for the years ended December 31, 2021 and 2022 are as follows, continued: 2022 Beginning Increase in provision Payment Reversal Others Ending balance In millions of won Employment benefits Provisions for employment benefits ￦ 1,048,939 997,281 (1,001,283 ) — 121 1,045,058 Litigation Litigation provisions 114,718 112,797 (39,633 ) (6,360 ) (343 ) 181,179 Decommissioning cost Nuclear plants 19,461,461 3,630,830 (56,813 ) — (51 ) 23,035,427 Spent fuel 1,350,662 493,943 (417,687 ) — — 1,426,918 Radioactive waste 1,832,535 221,629 (64,157 ) — — 1,990,007 PCBs 103,665 1,949 (17,156 ) (99 ) — 88,359 Other recovery provisions 30,231 2,093 (165 ) (751 ) 1,362 32,770 Others Power plant regional support program 146,588 52,470 (54,554 ) — — 144,504 Transmission regional support program 250,288 176,424 (187,477 ) — — 239,235 Provisions for financial guarantee 80,841 4,738 (17,789 ) — (550 ) 67,240 Provisions for RPS — 587,586 (556,993 ) (6,254 ) — 24,339 Provisions for greenhouse gas emissions obligations 655,544 387,299 (590,172 ) (33,596 ) (120,199 ) 298,876 Others 271,828 4,447 (39,566 ) (19,853 ) 925 217,781 ￦ 25,347,300 6,673,486 (3,043,445 ) (66,913 ) (118,735 ) 28,791,693
Summary of Greenhouse Gas Emissions Rights Allowances Received Free of Charge from the Government	(3) Greenhouse gas emissions rights and obligations: (i) Allowances received free of charge from the government for each planned period as of December 31, 2022 are as follows: 3rd planned period 2021 2022 2023 2024 2025 Total In ten thousands of tons(tCO2-eq) Allowances received free of charge from the government 15,085 14,789 14,784 4,928 4,928 54,514
Summary of Changes in Greenhouse Gas Emissions Rights	(ii) Changes in greenhouse gas emissions rights for the years ended December 31, 2021 and 2022 are as follows: 2021 2nd planned period 3rd planned period 2020 2021 2022 2023 2024 2025 Total Quantity Amount Quantity Amount Quantity Amount Quantity Amount Quantity Amount Quantity Amount Quantity Amount In ten thousands tons(tCO2-eq), Beginning 17,905 357,355 16,051 38,338 15,782 — 15,782 — 5,261 — 5,261 — 58,137 38,338 Purchase (Sell) 433 95,375 1,426 410,099 (31 ) 7,296 (43 ) 5,479 (75 ) — (50 ) 6,873 1,227 429,747 Government submission (17,560 ) (280,924 ) — — — — — — — — — — — — Borrowing (carryforward) (539 ) (113,014 ) 352 76,221 277 55,439 10 3,050 — — — — 639 134,710 Others (239 ) (58,792 ) — — — — — — — — — — — — Ending — — 17,829 524,658 16,028 62,735 15,749 8,529 5,186 — 5,211 6,873 60,003 602,795 2022 3rd planned period 2021 2022 2023 2024 2025 Total Quantity Amount Quantity Amount Quantity Amount Quantity Amount Quantity Amount Quantity Amount In ten thousands tons(tCO2-eq), Beginning (*) 16,433 524,658 14,942 62,735 11,166 8,529 3,671 — 3,696 6,873 49,908 602,795 Purchase (Sell) 1,191 267,433 1,343 272,824 32 6,315 35 7,185 — — 2,601 553,757 Government submission (17,602 ) (580,807 ) (838 ) (173,145 ) — 245 — — — — (18,440 ) (753,707 ) Borrowing (carryforward) (22 ) (3,298 ) 286 45,847 48 12,225 22 5,699 — — 334 60,473 Others — (207,986 ) — (16,256 ) — (8,529 ) — — — 5,419 — (227,352 ) Ending — — 15,733 192,005 11,246 18,785 3,728 12,884 3,696 12,292 34,403 235,966 (*) Changes such as additional allowances or cancellation of allowances are reflected. (iii) The Company does not have greenhouse gas emissions rights pledged as collateral as of December 31, 2022. (iv) The Company does not hold any greenhouse gas emissions rights prepared for generating a profit from short-term fluctuations in price as of December 31, 2022. (v) Estimated greenhouse gas emission of the Company for the year ended December 31, 2022 is 13,167 ten thousand tons.

Government Grants (Tables)

Government Grants (Tables)	12 Months Ended
	Dec. 31, 2022
Government grants [Abstract]
Summary of Government Grants	(1) Government grants as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Land ￦ (23,474 ) (27,405 ) Buildings (52,122 ) (50,437 ) Structures (172,021 ) (165,608 ) Machinery (140,082 ) (127,126 ) Vehicles (1,675 ) (2,045 ) Equipment (149 ) (6,608 ) Tools (64 ) (99 ) Construction-in-progress (111,822 ) (135,926 ) Investment properties (30 ) (21 ) Software (91 ) (174 ) Development expenditures (3,820 ) (3,477 ) Intangible assets under development (7,326 ) (2,108 ) Other intangible assets (71 ) (67 ) ￦ (512,747 ) (521,101 )
Summary of Changes in Government Grants	(2) Changes in government grants for the years ended December 31, 2021 and 2022 are as follows: 2021 Beginning Receipt Acquisition Offset the Disposal Others Ending In millions of won Cash ￦ — (37,920 ) — — — 37,920 — Land (23,475 ) — — — 1 — (23,474 ) Buildings (57,231 ) — — 5,174 — (65 ) (52,122 ) Structures (180,009 ) — — 9,517 1,811 (3,340 ) (172,021 ) Machinery (157,785 ) — — 17,519 531 (347 ) (140,082 ) Vehicles (632 ) — (26 ) 460 — (1,477 ) (1,675 ) Equipment (227 ) — — 95 — (17 ) (149 ) Tools (239 ) — — 209 — (34 ) (64 ) Construction-in-progress (79,126 ) — 5,027 — — (37,723 ) (111,822 ) Investment properties (29 ) — — 1 — (2 ) (30 ) Software (136 ) — — 64 — (19 ) (91 ) Development expenditures (5,043 ) — — 1,439 — (216 ) (3,820 ) Intangible assets under development (7,203 ) — — — — (123 ) (7,326 ) Other intangible assets (75 ) — — 4 — — (71 ) ￦ (511,210 ) (37,920 ) 5,001 34,482 2,343 (5,443 ) (512,747 ) 2022 Beginning Receipt Acquisition Offset the Disposal Others Ending In millions of won Cash ￦ — (50,755 ) — — — 50,755 — Land (23,474 ) — — — 1 (3,932 ) (27,405 ) Buildings (52,122 ) — — 5,360 — (3,675 ) (50,437 ) Structures (172,021 ) — — 9,568 1,250 (4,405 ) (165,608 ) Machinery (140,082 ) — — 17,283 405 (4,732 ) (127,126 ) Vehicles (1,675 ) — — 663 — (1,033 ) (2,045 ) Equipment (149 ) — — 494 — (6,953 ) (6,608 ) Tools (64 ) — — 32 — (67 ) (99 ) Construction-in-progress (111,822 ) — 23,155 — 17 (47,276 ) (135,926 ) Investment properties (30 ) — — 1 — 8 (21 ) Software (91 ) — — 60 — (143 ) (174 ) Development expenditures (3,820 ) — — 1,466 — (1,123 ) (3,477 ) Intangible assets under development (7,326 ) — — — — 5,218 (2,108 ) Other intangible assets (71 ) — — 4 — — (67 ) ￦ (512,747 ) (50,755 ) 23,155 34,931 1,673 (17,358 ) (521,101 )
Summary of Changes in Government Grants for Specific Business Projects	(3) Changes in government grants for specific business projects for the years ended December 31, 2021 and 2022 are as follows: 2021 Increase Decrease Received Interests Used Return Department Business Description Period Budget Beginning Self- Local Subsidies Self- Local Subsidies Self- Local Subsidies Self- Local Subsidies Others Ending In millions of won Ministry of Trade, Temporary Temporary 2021.04.01 ~ 2022.06.30 211,235 748 — — 139,550 — — — — — (122,563 ) — — — — 17,735 2022 Increase Decrease Received Interests Used Return Department Business Description Period Budget Beginning Self- Local Subsidies Self- Local Subsidies Self- Local Subsidies Self- Local Subsidies Others Ending In millions of won Ministry of Trade, Temporary Temporary 2021.04.01 ~ 2022.06.30 211,235 17,735 — — 71,685 — — — — — (88,300 ) — — — — 1,120

Deferred Revenues (Tables)

Deferred Revenues (Tables)	12 Months Ended
	Dec. 31, 2022
Deferred income including contract liabilities [abstract]
Deferred Revenues	Deferred revenue for the years ended December 31, 2021 and 2022 are as follows which included in current and non-current non-financial 2021 2022 In millions of won Beginning balance ￦ 9,868,189 10,356,555 Increase 1,149,578 1,330,129 Recognized as revenue (661,212 ) (711,839 ) Ending balance ￦ 10,356,555 10,974,845

Non-financial Liabilities (Tabl

Non-financial Liabilities (Tables)	12 Months Ended
	Dec. 31, 2022
Other Liabilities Disclosure [Abstract]
Non-financial Liabilities	Non-financial 2021 2022 Current Non-current Current Non-current In millions of won Advance received ￦ 4,157,916 398,056 4,544,206 284,618 Unearned revenue 40,187 6,517 86,584 7,200 Deferred revenue 659,397 9,697,158 702,430 10,272,415 Withholdings 345,892 5,171 207,217 2,408 Others 1,262,941 109,462 1,433,940 96,020 ￦ 6,466,333 10,216,364 6,974,377 10,662,661

Contributed Capital (Tables)

Contributed Capital (Tables)	12 Months Ended
	Dec. 31, 2022
Disclosure of classes of share capital [abstract]
Summary of Details Shares Issued	(1) Details of shares issued as of December 31, 2021 and 2022 are as follows: 2021 Shares authorized Shares Par value per share (in won) Owned by Owned by Total In millions of won except share information Common shares 1,200,000,000 641,964,077 ￦ 5,000 1,640,385 1,569,435 3,209,820 (*) Korea Development Bank’s interest of ￦1,056,176 million is included. 2022 Shares authorized Shares Par value per share (in won) Owned by Owned by Total In millions of won except share information Common shares 1,200,000,000 641,964,077 ￦ 5,000 1,640,385 1,569,435 3,209,820 (*) Korea Development Bank’s interest of ￦1,056,176 million is included.
Summary of Details in Number of Outstanding Capital Stock	(2) Details in number of outstanding capital stock for the years ended December 31, 2021 and 2022 are as follows. 2021 2022 Number of shares Beginning balance 641,964,077 641,964,077 Ending balance 641,964,077 641,964,077
Summary of Share Premium	(3) Details of share premium as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Share premium ￦ 843,758 843,758

Retained Earnings and Dividen_2

Retained Earnings and Dividends Paid (Tables)	12 Months Ended
	Dec. 31, 2022
Retained earnings [abstract]
Summary of Retained Earnings	(1) Details of retained earnings as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Legal reserve (*) ￦ 1,604,910 1,604,910 Voluntary reserves 33,282,817 27,782,969 Retained earnings (Undisposed deficit) 10,370,517 (7,956,579 ) Retained earnings ￦ 45,258,244 21,431,300 (*) The KEPCO Act requires KEPCO to appropriate a legal reserve equal to at least 20 percent of net income for each accounting period until the reserve equals 50 percent of KEPCO’s common stock. The legal reserve is not available for cash dividends; however, this reserve may be credited to paid-in
Voluntary Reserves	(2) Details of voluntary reserves as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Reserve for investment on social overhead capital ￦ 5,277,449 5,277,449 Reserve for research and human development (*) 330,000 330,000 Reserve for business expansion 27,465,368 21,965,520 Reserve for equalizing dividends 210,000 210,000 ￦ 33,282,817 27,782,969 (*) The reserve for research and human development is appropriated by KEPCO to use as qualified tax credits to reduce corporate tax liabilities. The reserve is available for cash dividends for a certain period as defined by the Restriction of Special Taxation Act of Korea.
Summary of Changes in Retained Earnings	(3) Changes in retained earnings for the years ended December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Beginning balance ￦ 51,134,330 45,258,244 Loss for the year attributed to owners of the controlling company (5,304,522 ) (24,466,853 ) Changes in equity method retained earnings 3,609 12,305 Remeasurements of defined benefit liability, net of tax 201,067 626,769 Transfer of gain or loss on valuation of financial assets at FVOCI 4,388 — Dividends paid (780,628 ) — Additional paid-in capital and others — 835 Ending balance ￦ 45,258,244 21,431,300
Summary of Dividends Paid	(4) Dividends paid for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 In millions of won Number of shares issued Number of treasury stocks Number of shares eligible for dividends Dividends paid per share Dividends paid (In won) Common shares 641,964,077 — 641,964,077 ￦ — — 2021 In millions of won Number of shares issued Number of treasury stocks Number of shares eligible for dividends Dividends paid per share Dividends paid (In won) Common shares 641,964,077 — 641,964,077 ￦ 1,216 780,628 2022 In millions of won Number of shares issued Number of treasury stocks Number of shares eligible for dividends Dividends paid per share Dividends paid (In won) Common shares 641,964,077 — 641,964,077 ￦ — —
Changes in Retained Earnings of Investments in Associates And Joint Ventures	(5) Changes in retained earnings of investments in associates and joint ventures for the years ended December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Beginning balance ￦ 361 3,970 Changes 3,609 12,305 Ending balance ￦ 3,970 16,275
Summary of Changes in Reserve of Remeasurement	(6) Changes in remeasurement components related to defined benefit liability for the years ended December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Beginning balance ￦ (169,234 ) 98,844 Changes 327,957 964,791 Income tax effect (126,890 ) (338,022 ) Transfer to reserve for business expansion 67,011 (110,808 ) Ending balance ￦ 98,844 614,805

Statements of Appropriation o_2

Statements of Appropriation of Retained Earnings (Disposition of Deficit) (Tables)	12 Months Ended
	Dec. 31, 2022
Statement of Appropriation of Retained Earnings [Abstract]
Statements of Appropriation of Retained Earnings (Disposition of Deficit)	Statements of disposition of deficit of KEPCO, the controlling company, for the years ended December 31, 2021 and 2022, respectively, are as follows: 2021 2022 In millions of won except for I.   Deficit before disposition Undisposed deficit carried over from prior years ￦ — — Net loss (5,607,732 ) (25,297,713 ) Remeasurement of the defined benefit plan 107,884 327,056 (5,499,848 ) (24,970,657 ) II. Transfer from voluntary reserves 5,499,848 24,970,657 III.  Subtotal ( I+II ) — — IV.  Disposition of deficit V. Undisposed deficit to be carried over forward to subsequent year — —

Hybrid Bonds (Tables)

Hybrid Bonds (Tables)	12 Months Ended
	Dec. 31, 2022
Hybrid Bonds [Abstract]
Hybrid Bonds	Hybrid bonds classified as equity (non-controlling Issuer Hybrid bond Issued date Maturity Yield (%) 2021 2022 In millions of won Korea South-East Power Co., Ltd. (*1) 1st hybrid bond 2012.12.07 2042.12.06 4.38 ￦ 170,000 — Korea South-East Power Co., Ltd. (*2) 2nd hybrid bond 2012.12.07 2042.12.06 4.44 230,000 230,000 Expense of issuance (1,090 ) (627 ) ￦ 398,910 229,373 (*1) The call option was exercised for the 1st hybrid bond during the current period. (*2) Bondholders may not require prepayment in any case, and the Company has a call option to repay all of these bonds on or after 12 years from the date of issuance of the bonds, or on each interest payment date henceforth. In addition, there is a step-up clause from the date of the initial call option exercise. Although these instruments have contractual maturity dates, the contractual agreements allow these subsidiaries to indefinitely extend the maturity dates and defer the payment of interest without modification to the other terms of the instruments. When the Company decides not to pay dividends on common shares, they are not required to pay interest on the hybrid bonds.

Other Components of Equity (Tab

Other Components of Equity (Tables)	12 Months Ended
	Dec. 31, 2022
Disclosure of reserves within equity [abstract]
Summary of Other Components of Equity
Summary of Changes in Other Capital Surplus
Summary of Changes in Accumulated Other Comprehensive Income (Loss)
Summary of Changes in Other equity

Sales (Tables)

Sales (Tables)	12 Months Ended
	Dec. 31, 2022
Revenue [abstract]
Summary of Sales	Details of sales for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 Domestic Overseas Domestic Overseas Domestic Overseas In millions of won [Type of goods and services] Sales of goods ￦ 56,381,405 303,704 58,359,774 441,203 68,578,390 606,079 Electricity 55,731,782 — 57,308,555 — 66,198,964 — Heat supply 198,715 — 232,738 — 489,629 — Others 450,908 303,704 818,481 441,203 1,889,797 606,079 Sales related to rendering of services 223,075 206,275 252,216 204,184 370,799 343,803 Sales related to construction services 170,895 641,280 159,262 595,736 193,541 453,412 ￦ 56,775,375 1,151,259 58,771,252 1,241,123 69,142,730 1,403,294 [Timing of revenue recognition] Performance obligations satisfied at a point in time ￦ 56,381,405 303,704 58,359,774 441,203 68,578,390 606,079 Performance obligations satisfied over time 393,970 847,555 411,478 799,920 564,340 797,215 ￦ 56,775,375 1,151,259 58,771,252 1,241,123 69,142,730 1,403,294

Selling and Administrative Ex_2

Selling and Administrative Expenses (Tables)	12 Months Ended
	Dec. 31, 2022
Selling, general and administrative expense [abstract]
Summary of Selling and Administrative Expenses	(1) Selling and administrative expenses for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Salaries ￦ 1,095,183 1,121,188 1,142,360 Retirement benefit expense 103,967 113,127 109,758 Welfare and benefit expense 155,071 155,558 155,781 Insurance expense 10,178 17,909 20,835 Depreciation 218,103 219,427 244,676 Amortization of intangible assets 87,086 91,428 85,661 Bad debt expense 20,648 17,968 23,634 Commission 368,275 410,287 420,390 Advertising expense 29,559 29,230 33,739 Training expense 5,196 4,923 7,327 Vehicle maintenance expense 9,435 8,849 10,749 Publishing expense 3,677 3,568 3,732 Business promotion expense 3,614 3,522 3,198 Rent expense 36,337 43,650 47,680 Telecommunication expense 8,686 8,569 7,945 Transportation expense 1,007 870 1,012 Taxes and dues 62,828 93,446 122,177 Expendable supplies expense 8,029 9,052 9,617 Water, light and heating expense 11,749 12,351 17,950 Repairs and maintenance expense 79,185 123,134 152,449 Ordinary development expense 197,436 213,936 213,932 Travel expense 10,793 11,099 16,062 Clothing expense 14,834 10,540 13,044 Survey and analysis expense 826 889 1,126 Membership fee 1,274 1,331 1,469 Others 135,467 149,945 143,119 ￦ 2,678,443 2,875,796 3,009,422
Summary of Other Selling and Administrative Expenses	(2) Details of “others” included in selling and administrative expenses for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Accommodation development expenses ￦ 30,889 57,815 56,038 Miscellaneous wages 45,887 47,221 31,910 Litigation and filing expenses 19,341 16,383 14,876 Compensation for damages 8,374 3,303 3,116 Outsourcing expenses 3,610 3,799 3,635 Reward expenses 3,228 3,006 2,740 Overseas market development expenses 1,218 1,192 1,376 Others 22,920 17,226 29,428 ￦ 135,467 149,945 143,119

Other Income and Expense (Table

Other Income and Expense (Tables)	12 Months Ended
	Dec. 31, 2022
Disclosure of other operating income (expense) [Abstract]
Summary of Other Income	(1) Other income for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Reversal of other provisions ￦ 25,826 15,548 15,265 Reversal of other allowance for doubtful accounts 2,465 98 37 Gains on government grants 269 458 301 Gains on assets contributed 24,324 9,347 1,953 Gains on liabilities exempted 1,314 1,830 1,181 Compensation and reparations revenue 95,407 104,826 89,638 Revenue from foundation fund — 1 3 Revenue from research contracts 4,001 5,996 8,191 Income related to transfer of assets from customers 643,477 661,212 711,839 Rental income 193,567 204,123 208,064 Others 45,798 30,694 59,017 ￦ 1,036,448 1,034,133 1,095,489
Summary of Details of Others of Other Income	(2) Details of “others” included in other income for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Refund of claim for rectification ￦ 11,880 7,274 701 Adjustment of research project 2,150 7,638 — Maintenance expenses on lease building 2,785 160 125 Training expenses 3,852 1,739 1,684 Deposit redemption 314 378 12 Reversal of expenses on litigation 620 991 1,920 Revenue on royalty fee — 173 455 Reimbursement of insurance fee 22 1 — Gains on guarantee contracts 134 27 22 Others 24,041 12,313 54,098 ￦ 45,798 30,694 59,017
Summary of Other Expense	(3) Other expenses for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Compensation and indemnification expense ￦ 11,959 663 36 Accretion expenses of other provisions 17,991 2,711 1,138 Depreciation expenses on investment properties 1,453 1,386 486 Depreciation expenses on idle assets 6,604 3,621 3,635 Other bad debt expense 32,503 49,372 6,400 Donations 316,981 152,456 131,037 Others 30,229 47,723 69,418 ￦ 417,720 257,932 212,150
Summary of Others of Other Expense	(4) Details of “others” included in other expenses for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Operating expenses related to the idle assets ￦ 46 44 1,683 Research grants 91 109 562 Expenses related to farming and fishing village supports 16,115 17,065 11,272 Expenses related to Operating of a fitness center 5,101 6,948 8,370 Expenses on adjustment of research and development grants 720 2,241 260 Taxes and dues 253 119 31,985 Expenses on R&D supports 242 861 48 Others 7,661 20,336 15,238 ￦ 30,229 47,723 69,418

Other Gains (Losses) (Tables)

Other Gains (Losses) (Tables)	12 Months Ended
	Dec. 31, 2022
Other Gains (Losses) [Abstract]
Summary of Other Gains (Losses)	(1) Composition of other gains (losses) for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Other gains Gains on disposal of property, plant and equipment ￦ 93,195 56,284 148,667 Gains on disposal of intangible assets 1,556 1 41 Reversal of impairment loss on property, plant and equipment 7,805 — 134,735 Reversal of impairment loss on intangible assets — 14 — Gains on foreign currency translation 8,917 20,598 36,097 Gains on foreign currency transaction 61,865 48,671 235,221 Gains on insurance proceeds 43,800 144 43,497 Others 322,379 250,174 294,091 Other losses Losses on disposal of property, plant and equipment (162,725 ) (92,622 ) (100,066 ) Losses on disposal of intangible assets (392 ) (145 ) (116 ) Losses on valuation of other non-current assets (241 ) — — Impairment loss on property, plant and equipment (80,413 ) (4,056 ) (37,311 ) Impairment loss on intangible assets (3,599 ) — (164 ) Impairment loss on other non-current — (16,035 ) — Losses on foreign currency translation (17,664 ) (4,732 ) (14,738 ) Losses on foreign currency transaction (49,694 ) (67,990 ) (299,117 ) Others (189,695 ) (181,787 ) (197,715 ) ￦ 35,094 8,519 243,122
Summary of Others of Other Gains	(2) Details of “others” included in other gains for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Gains on disposal of inventories ￦ 3,373 4,446 11,091 Gains on proxy collection of TV license fee 41,438 42,271 42,286 Gains on compensation of impaired electric poles 978 812 768 Gains on harbor facilities dues 2,231 3,281 4,198 Gains on technical fees 4,826 3,968 2,972 Reversal of occupation development training fees 352 229 525 Gains on disposal of waste 6,927 4,272 7,749 Gains on insurance — 690 — Gains on tax rebate 772 685 548 Gains on other commission 1,643 1,822 2,097 Gains on disposal of greenhouse gas emissions rights — 8,739 — Gains on disposal of assets held-for-sale — 160 236 Others 259,839 178,799 221,621 ￦ 322,379 250,174 294,091
Summary of Others of Other Losses	(3) Details of “others” included in other losses for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Losses on valuation of inventories ￦ 4,998 7,761 14,528 Losses on disposal of inventories 37,644 8,874 8,324 Losses due to disaster 16,814 6,238 5,068 Losses on rounding adjustment of electric charge surtax 1,276 1,283 1,317 Loss on disposal of greenhouse gas emissions rights — 11,282 — Others 128,963 146,349 168,478 ￦ 189,695 181,787 197,715

Finance Income (Tables)

Finance Income (Tables)	12 Months Ended
	Dec. 31, 2022
Finance income [Abstract]
Summary of Finance Income	(1) Finance income for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Interest income ￦ 242,586 221,874 340,753 Dividends income 7,316 10,522 28,875 Gains on disposal of financial assets 11,992 7,718 11,199 Gains on valuation of financial assets at fair value through profit or loss 12,904 14,338 7,099 Gains on valuation of derivatives 57,563 860,011 595,256 Gains on transaction of derivatives 146,448 124,900 429,847 Gains on foreign currency translation 1,005,961 146,349 389,361 Gains on foreign currency transactions 24,009 15,618 29,997 Other financial income 1,470 1,284 925 ￦ 1,510,249 1,402,614 1,833,312
Summary of Interest Income	(2) Details of interest income included in finance income for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Cash and cash equivalents ￦ 9,419 12,692 51,872 Financial assets at fair value through profit or loss 19,114 18,415 58,540 Financial assets at amortized cost 612 797 1,308 Loans 26,232 25,196 33,545 Short-term financial instruments 25,540 7,531 15,827 Long-term financial instruments 10,406 12,470 14,371 Other financial assets 228 230 637 Trade and other receivables 151,035 144,543 164,653 ￦ 242,586 221,874 340,753

Finance Expenses (Tables)

Finance Expenses (Tables)	12 Months Ended
	Dec. 31, 2022
Finance Expenses [Abstract]
Summary of Finance Expenses	(1) Finance expenses for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Interest expense ￦ 1,995,425 1,914,457 2,818,546 Losses on sale of financial assets 648 1,045 1,841 Losses on valuation of financial assets at fair value through profit or loss 7,396 5,480 44,329 Losses on valuation of derivatives 513,278 37,017 371,038 Losses on transaction of derivatives 81,055 40,818 205,162 Losses on foreign currency translation 215,047 1,159,334 934,005 Losses on foreign currency transaction 79,103 83,558 346,711 Losses on repayment of financial liabilities 35 10 15 Others 4,456 4,058 25,144 ￦ 2,896,443 3,245,777 4,746,791
Summary of Interest Expenses	(2) Details of interest expense included in finance expenses for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Trade and other payables ￦ 88,757 213,765 204,078 Short-term borrowings 29,358 42,371 145,201 Long-term borrowings 118,678 115,141 204,037 Debt securities 1,805,253 1,728,588 2,388,517 Other financial liabilities 540,867 384,423 472,248 2,582,913 2,484,288 3,414,081 Less: Capitalized borrowing costs (587,488 ) (569,831 ) (595,535 ) ￦ 1,995,425 1,914,457 2,818,546

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2022
Income Taxes [Abstract]
Summary of Income Tax Expense (Benefit)	(1) Income tax expense (benefit) for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Current income tax expense Payment of income tax ￦ 671,179 357,767 563,681 Adjustment in respect of prior years due to change in estimate (63,756 ) 153,113 48,374 Current income tax directly recognized in equity 51,486 (198,714 ) (350,348 ) 658,909 312,166 261,707 Deferred tax expense (benefit) Generation and realization of temporary differences (77,985 ) (489,411 ) (564,801 ) Reclassified from equity to profit (loss) — — (4,964 ) Changes of unrecognized tax losses, tax credit and temporary differences for prior periods (10,471 ) (43,653 ) (38,708 ) Changes in deferred tax on tax losses carryforwards 296,070 (1,641,823 ) (9,175,755 ) Tax credit carryforwards 32,541 (12,199 ) 34,019 Amount due to change in tax rate or regulations — 18,931 73,991 240,155 (2,168,155 ) (9,676,218 ) Income tax expense (benefit) ￦ 899,064 (1,855,989 ) (9,414,511 )
Summary of Reconciliation Between Actual Income Tax Expense and Amount Computed by Applying the Statutory Tax Rate	(2) Reconciliation between actual income tax expense (benefit) and amount computed by applying the statutory tax rate to profit (loss) before income taxes for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Profit (loss) before income tax ￦ 2,991,533 (7,071,570 ) (33,843,619 ) Income tax expense (benefit) computed at applicable tax rate (*1) 822,672 (1,944,682 ) (9,306,995 ) Adjustments Effect of applying gradual tax rate (10,362 ) (10,362 ) (10,362 ) Effect of non-taxable (13,593 ) (4,983 ) (9,471 ) Effect of non-deductible 46,776 78,814 39,663 Effect of tax losses that are not recognized as deferred tax asset — 1,351 19,275 Effects of tax credits and deduction (63,753 ) (43,931 ) (98,684 ) Reversal of unrecognized deferred tax asset, net (10,471 ) (43,641 ) (38,708 ) Effect of change in deferred tax due to change in tax rate (17,590 ) 18,931 393,416 Deduction of deferred tax assets 55,682 73,887 (85,514 ) Deferred tax related to investments in subsidiaries, associates and joint ventures 102,137 (135,878 ) (375,064 ) Others, net 51,322 1,392 9,559 140,148 (64,420 ) (155,890 ) Adjustment in respect of prior years due to change in estimate (63,756 ) 153,113 48,374 Income tax expense (benefit) ￦ 899,064 (1,855,989 ) (9,414,511 ) Effective tax rate 30.05 % (*2 ) (*2 ) (*1) Applicable tax rate is 27.5% as of December 31, 2020, 2021 and 2022. (*2) The effective tax rate for the year ended December 31, 2020 is 30.05
Summary of Income Tax Directly Adjusted to Shareholders' Equity (Except for Accumulated Other Comprehensive Income (Loss))	(3) Income tax directly adjusted to equity (except for accumulated other comprehensive income (loss)) for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Dividends of hybrid bond ￦ 4,273 4,736 4,149 Disposal of subsidiaries — — 406 ￦ 4,273 4,736 4,555
Summary of Income Tax Recognized as Other Comprehensive Income (Loss)	(4) Income tax recognized as other comprehensive income (loss) for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 2021 2022 In millions of won Income tax recognized as other comprehensive income (loss) Gain (loss) on valuation of financial assets at fair value through other comprehensive income ￦ 19,447 (9,753 ) (31,416 ) Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax (47,231 ) 24,220 40,390 Remeasurement of defined benefit liability 14,971 (126,890 ) (322,489 ) Investments in associates 35,714 (53,672 ) (66,677 ) Others 24,312 (37,355 ) 25,289 ￦ 47,213 (203,450 ) (354,903 )
Summary of Changes in Deferred Income Tax Assets (Liabilities)	(5) Changes in deferred tax assets (liabilities) recognized in the consolidated statements of financial position for the years ended December 31, 2021 and 2022 are as follows: 2021 Beginning balance Amounts Amount Amounts recognized directly in equity Ending balance In millions of won Deferred tax on temporary differences Employee benefits ￦ 689,787 (4,514 ) (126,890 ) — 558,383 Cash flow hedge 15,587 (90,217 ) 24,220 463 (49,947 ) Investments in subsidiaries, associates and joint ventures (8,668,015 ) 367 (53,672 ) — (8,721,320 ) Property, plant and equipment (7,713,449 ) 282,988 — — (7,430,461 ) Finance lease (211,420 ) (204,138 ) — — (415,558 ) Intangible assets (31,166 ) (315 ) — — (31,481 ) Financial assets at fair value through profit or loss 13 (1 ) — — 12 Financial assets at fair value through other comprehensive income 37,950 (816 ) (9,753 ) — 27,381 Deferred revenue 199,701 (13,310 ) — — 186,391 Provisions 5,916,803 577,511 — — 6,494,314 Doubtful receivables — 801 — — 801 Other finance liabilities 30,399 (3,262 ) — 4,273 31,410 Gains or losses on foreign exchange translation (11,635 ) 103,046 — — 91,411 Allowance for doubtful accounts 56,129 8,135 — — 64,264 Accrued income 8,944 1,058 — — 10,002 Special deduction for property, plant and equipment (226,351 ) 2,224 — — (224,127 ) Others 1,505,951 (22,769 ) (37,355 ) — 1,445,827 (8,400,772 ) 636,788 (203,450 ) 4,736 (7,962,698 ) Deferred tax on unused tax losses and tax credit Unused tax losses 893,074 1,666,803 — — 2,559,877 Excess of donation limit 35,181 34,004 — — 69,185 Tax credit 105,416 29,274 — — 134,690 1,033,671 1,730,081 — — 2,763,752 ￦ (7,367,101 ) 2,366,869 (203,450 ) 4,736 (5,198,946 ) 2022 Beginning balance Amounts Amount Amounts recognized directly in equity Ending balance In millions of won Deferred tax on temporary differences Employee benefits ￦ 558,383 (36,341 ) (322,489 ) — 199,553 Cash flow hedge (49,947 ) (46,188 ) 40,390 405 (55,340 ) Investments in subsidiaries, associates and joint ventures (8,721,320 ) 410,310 (66,677 ) — (8,377,687 ) Property, plant and equipment (7,430,461 ) (111,177 ) — — (7,541,638 ) Finance lease (415,558 ) 9,919 — — (405,639 ) Intangible assets (31,481 ) 6,550 — — (24,931 ) Financial assets at fair value through profit or loss 12 3,445 — — 3,457 Financial assets at fair value through other comprehensive income 27,381 25,178 (31,416 ) — 21,143 Deferred revenue 186,391 (16,411 ) — — 169,980 Provisions 6,494,314 595,030 — — 7,089,344 Doubtful receivables 801 1,673 — — 2,474 Other finance liabilities 31,410 (14,142 ) — 4,150 21,418 Gains or losses on foreign exchange translation 91,411 42,905 — — 134,316 Allowance for doubtful accounts 64,264 (6,029 ) — — 58,235 Accrued income 10,002 6,612 — — 16,614 Special deduction for property, plant and equipment (224,127 ) 8,968 — — (215,159 ) Others 1,445,827 16,456 25,289 — 1,487,572 (7,962,698 ) 896,758 (354,903 ) 4,555 (7,416,288 ) Deferred tax on unused tax losses and tax credit Unused tax losses 2,559,877 9,102,228 — — 11,662,105 Excess of donation limit 69,185 11,861 — — 81,046 Tax credit 134,690 15,719 — — 150,409 2,763,752 9,129,808 — — 11,893,560 ￦ (5,198,946 ) 10,026,566 (354,903 ) 4,555 4,477,272
Summary of Deferred Income Tax Assets (Liabilities)	(6) Deferred tax assets (liabilities) recognized in the consolidated statements of financial position as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Deferred tax assets ￦ 1,901,992 10,934,375 Deferred tax liabilities (7,100,938 ) (6,457,103 ) ￦ (5,198,946 ) 4,477,272
Summary of Deductible Temporary Differences, Tax Losses and Unused Tax Credits for Which No Deferred Income Tax Assets Were Recognized	(7) Details of deductible temporary differences, tax losses and unused tax credits for which no deferred tax assets were recognized as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Deductible temporary differences ￦ 1,539,980 1,381,532

Assets Held-for-Sale (Tables)

Assets Held-for-Sale (Tables)	12 Months Ended
	Dec. 31, 2022
Non-current assets or disposal groups classified as held for sale or as held for distribution to owners [abstract]
Assets Held-for-Sale	Assets held-for-sale 2021 2022 In millions of won Land (*1,2) ￦ 2,907 31,766 Buildings (*1,2) 12,971 12,981 Structures (*1) 1 1 ￦ 15,879 44,748 (*1) The board of directors of KEPCO Engineering & Construction Company, Inc., a subsidiary of the Company, made a resolution to sell its old office building in Yongin-si, Gyeonggi-do held-for-sale (*2) The board of directors of Korea Electric Power Corporation, the controlling company, made a resolution to sell the Uijeongbu substation during the year ended December 31, 2022, and reclassified the buildings and land as assets held-for-sale expecting its carrying amount would be recovered through a sale transaction.

Expenses Classified by Nature (

Expenses Classified by Nature (Tables)	12 Months Ended
	Dec. 31, 2022
Expenses by nature [abstract]
Expenses Classified by Nature	Expenses classified by nature for the years ended December 31, 2020, 2021 and 2022 are as follows: 2020 Selling and Cost of Total In millions of won Raw materials used ￦ — 13,544,410 13,544,410 Salaries 1,095,183 4,183,454 5,278,637 Retirement benefit expense 103,967 458,029 561,996 Welfare and benefit expense 155,071 484,319 639,390 Insurance expense 10,178 93,130 103,308 Depreciation 218,103 11,151,393 11,369,496 Amortization of intangible assets 87,086 83,380 170,466 Bad debt expense 20,648 — 20648 Commission 368,275 376,047 744,322 Advertising expense 29,559 8,161 37,720 Training expense 5,196 12,912 18,108 Vehicle maintenance expense 9,435 7,161 16,596 Publishing expense 3,677 3,524 7,201 Business promotion expense 3,614 3,720 7,334 Rent expense 36,337 191,073 227,410 Telecommunication expense 8,686 9,961 18,647 Transportation expense 1,007 10,362 11,369 Taxes and dues 62,828 492,203 555,031 Expendable supplies expense 8,029 36,966 44,995 Water, light and heating expense 11,749 31,209 42,958 Repairs and maintenance expense 79,185 2,465,716 2,544,901 Ordinary development expense 197,436 503,206 700,642 Travel expense 10,793 60,896 71,689 Clothing expense 14,834 8,116 22,950 Survey and analysis expense 826 3,746 4,572 Membership fee 1,274 13,130 14,404 Power purchase — 15,725,220 15,725,220 Others 135,467 1,842,735 1,978,202 ￦ 2,678,443 51,804,179 54,482,622 2021 Selling and Cost of Total In millions of won Raw materials used ￦ — 18,660,477 18,660,477 Salaries 1,121,188 4,276,494 5,397,682 Retirement benefit expense 113,127 488,263 601,390 Welfare and benefit expense 155,558 570,440 725,998 Insurance expense 17,909 104,544 122,453 Depreciation 219,427 11,551,897 11,771,324 Amortization of intangible assets 91,428 74,733 166,161 Bad debt expense 17,968 — 17,968 Commission 410,287 307,272 717,559 Advertising expense 29,230 9,552 38,782 Training expense 4,923 13,283 18,206 Vehicle maintenance expense 8,849 8,152 17,001 Publishing expense 3,568 3,310 6,878 Business promotion expense 3,522 3,777 7,299 Rent expense 43,650 194,234 237,884 Telecommunication expense 8,569 10,959 19,528 Transportation expense 870 53,365 54,235 Taxes and dues 93,446 529,380 622,826 Expendable supplies expense 9,052 41,414 50,466 Water, light and heating expense 12,351 43,025 55,376 Repairs and maintenance expense 123,134 2,494,861 2,617,995 Ordinary development expense 213,936 475,461 689,397 Travel expense 11,099 67,103 78,202 Clothing expense 10,540 7,994 18,534 Survey and analysis expense 889 3,992 4,881 Membership fee 1,331 8,492 9,823 Power purchase — 21,619,039 21,619,039 Others 149,945 2,022,777 2,172,722 ￦ 2,875,796 63,644,290 66,520,086 2022 Selling and Cost of sales Total In millions of won Raw materials used ￦ — 34,832,581 34,832,581 Salaries 1,142,360 4,329,099 5,471,459 Retirement benefit expense 109,758 505,612 615,370 Welfare and benefit expense 155,781 540,058 695,839 Insurance expense 20,835 106,672 127,507 Depreciation 244,676 12,056,455 12,301,131 Amortization of intangible assets 85,661 70,499 156,160 Bad debt expense 23,634 — 23,634 Commission 420,390 351,557 771,947 Advertising expense 33,739 10,552 44,291 Training expense 7,327 14,813 22,140 Vehicle maintenance expense 10,749 10,275 21,024 Publishing expense 3,732 3,014 6,746 Business promotion expense 3,198 3,340 6,538 Rent expense 47,680 186,439 234,119 Telecommunication expense 7,945 9,677 17,622 Transportation expense 1,012 113,845 114,857 Taxes and dues 122,177 554,320 676,497 Expendable supplies expense 9,617 47,159 56,776 Water, light and heating expense 17,950 60,002 77,952 Repairs and maintenance expense 152,449 2,586,975 2,739,424 Ordinary development expense 213,932 513,878 727,810 Travel expense 16,062 78,999 95,061 Clothing expense 13,044 8,778 21,822 Survey and analysis expense 1,126 4,322 5,448 Membership fee 1,469 16,912 18,381 Power purchase — 41,984,858 41,984,858 Others 143,119 1,902,903 2,046,022 ￦ 3,009,422 100,903,594 103,913,016

Earnings (Loss) Per Share (Tabl

Earnings (Loss) Per Share (Tables)	12 Months Ended
	Dec. 31, 2022
Earnings per share [abstract]
Basic Earnings Per Share	(1) Basic earnings (loss) per share for the years ended December 31, 2020, 2021 and 2022 are as follows: Type 2020 2021 2022 In won Basic earnings (loss) per share ￦ 3,102 (8,263 ) (38,112 )
Diluted Earnings Per Share	(2) Diluted earnings (loss) per share for the years ended December 31, 2020, 2021 and 2022 are as follows: Type 2020 2021 2022 In won Diluted earnings (loss) per share ￦ 3,102 (8,263 ) (38,112 )
Calculation of Basic Earnings Per Share	(3) Basic earnings (loss) per share Profit (loss) for the year and weighted average number of common shares used in the calculation of basic earnings (loss) per share for the years ended December 31, 2020, 2021 and 2022 are as follows: Type 2020 2021 2022 In millions of won except number of shares Profit (loss) attributable to owners of the controlling company ￦ 1,991,347 (5,304,522 ) (24,466,853 ) Profit (loss) used in the calculation of total basic earnings (loss) per share 1,991,347 (5,304,522 ) (24,466,853 ) Weighted average number of common shares 641,964,077 641,964,077 641,964,077
Calculation of Diluted Earnings Per Share	(4) Diluted earnings (loss) per share Diluted earnings (loss) per share is calculated by applying adjusted weighted average number of common shares under the assumption that all dilutive potential common shares are converted to common shares. Profit (loss) used in the calculation of total diluted earnings (loss) per share for the years ended December 31, 2020, 2021 and 2022 are as follows: Type 2020 2021 2022 In millions of won Profit (loss) used in the calculation of total diluted earnings (loss) per share ￦ 1,991,347 (5,304,522 ) (24,466,853 ) Weighted average number of common shares used in calculating diluted earnings (loss) per share are adjusted from weighted average number of common shares used in calculating basic earnings (loss) per share. Detailed information of the adjustment for the years ended December 31, 2020, 2021 and 2022 are as follows: Type 2020 2021 2022 In number of shares Weighted average number of common shares 641,964,077 641,964,077 641,964,077 Diluted weighted average number of shares 641,964,077 641,964,077 641,964,077

Risk Management (Tables)

Risk Management (Tables)	12 Months Ended
	Dec. 31, 2022
Risk Management [Abstract]
Summary of Capital Risk Management	Details of the Company’s capital management accounts as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Total borrowings and debt securities ￦ 80,529,513 120,605,365 Cash and cash equivalents 2,635,238 3,234,780 Net borrowings and debt securities 77,894,275 117,370,585 Total equity 65,326,706 42,000,256 Debt to equity ratio 119.24 % 279.45 %
Summary of Maximum Exposure to Credit Risk	Book values of the financial assets represent the maximum exposed amounts of the credit risk. Details of the Company’s level of maximum exposure to credit risk as of December 31, 2021 and 2022 are as follows: 2021 2022 In millions of won Cash and cash equivalents ￦ 2,635,238 3,234,780 Financial assets at fair value through profit or loss(*1) 932,736 3,610,408 Derivative assets (trading) 443,027 693,072 Financial assets at fair value through other comprehensive income (debt securities) 491 529 Financial assets at amortized cost 25,273 26,998 Loans 909,071 1,013,371 Long-term/short-term financial instruments 1,728,508 1,353,080 Derivative assets (applying hedge accounting) 204,756 324,952 Trade and other receivables 10,029,276 12,614,902 Financial guarantee contracts(*2) 3,718,015 3,776,060 (*1) Equity investments held by the Company are excluded. (*2) Maximum exposure associated with the financial guarantee contracts is the maximum amounts of the obligation. As of the reporting date, there are no financial assets and non-financial
Summary of Sensitivity Analysis for Actuarial Assumptions	A sensitivity analysis of defined benefit obligation assuming a 1% increase and decrease movements in the actuarial valuation assumptions as of December 31, 2021 and 2022 are as follows: 2021 2022 Type Accounts 1% Increase 1% Decrease 1% 1% In millions of won Future salary increases Increase (decrease) in defined benefit obligation ￦ 466,832 (407,554 ) 321,930 (283,658 ) Discount rate Increase (decrease) in (422,290 ) 499,571 (289,229 ) 337,033 Changes of employee benefits assuming a 1% increase and decrease movements in discount rate on plan asset for the years ended December 31, 2021 and 2022 are ￦25,649 million and ￦27,495 million, respectively.
Summary of Principal Assumptions on Provisions Valuation	Changes in provisions due to movements in underlying assumptions as of December 31, 2021 and 2022 are as follows: Type Accounts 2021 2022 PCBs Inflation rate 1.37 % 1.98 % Discount rate 1.88 % 1.92 % Nuclear plants Inflation rate 1.41 % 2.25 % Discount rate 2.20 % 2.48 % Spent fuel Inflation rate 2.93 % 2.93 % Discount rate 4.49 % 4.49 % Radioactive waste Inflation rate 1.00 % 3.06 % Discount rate 1.87 % 2.62 %
Summary of Sensitivity Analysis for Provisions Assumptions	A sensitivity analysis of provisions assuming a 0.1% increase and decrease movements in the underlying assumptions as of December 31, 2021 and 2022 are as follows: 2021 2022 Type Accounts 0.1% Increase 0.1% Decrease 0.1% Increase 0.1% Decrease In millions of won Discount rate PCBs ￦ (222 ) 223 (169 ) 169 Nuclear plants (369,540 ) 381,026 (474,432 ) 491,360 Spent fuel (51,430 ) 53,438 (54,330 ) 56,453 Radioactive waste (11,201 ) 11,306 (15,089 ) 15,260 Inflation rate PCBs 224 (224 ) 169 (169 ) Nuclear plants 403,420 (391,754 ) 515,262 (498,258 ) Spent fuel 54,210 (52,245 ) 57,269 (55,191 ) Radioactive waste 10,366 (10,288 ) 14,190 14,056
Summary of Foreign Currency Risk	The Company undertakes transactions denominated in foreign currencies; consequently, exposures to exchange rate fluctuations arise. The carrying amounts of the Company’s foreign currency denominated monetary assets and monetary liabilities as of December 31, 2021 and 2022 are as follows: Assets Liabilities Type 2021 2022 2021 2022 In thousands of foreign currencies AED 6,481 5,610 31,637 25,597 AUD 3,733 4,448 926,960 299,663 BDT 50,145 7,514 577 — BWP 939 824 — — EGP — — 595 1,162 CAD 582 89 2,266 595 CHF — — 500,230 500,158 CZK — — 386 153 EUR 1,809 1,976 42,981 41,073 GBP — — — 31 HKD — — 1,651,665 4,014,446 IDR 768,731 598,697 995,510 1,323,840 INR 1,715,900 1,592,380 342,833 312,978 JOD 1,852 1,146 118 14 JPY 697,747 568,263 153,383 1,719,846 KZT 1,510 1,510 — — MGA 4,262,857 2,856,045 475,807 347,403 MMK 210,335 199,518 — — MYR 1,964 38,177 — — PHP 164,167 68,592 104,245 7,493 PKR 200,844 533,816 74,423 219,341 RUB — — — 2,881 SAR 2,615 1,713 — 9,710 SEK — — 449,167 449,211 THB — — — 389 USD 1,381,441 1,484,614 12,023,085 13,599,643 UYU 90,930 128,674 3,097 3,106 VND 952,135 1,184,670 262,372 4,495 ZAR 31,971 43,461 — —
Summary of Sensitivity Analysis for Foreign Currency Exchange Rates	A sensitivity analysis on the Company’s income for the period assuming a 10% increase and decrease in currency exchange rates as of December 31, 2021 and 2022 are as follows: 2021 2022 Type 10% Increase 10% Decrease 10% Increase 10% Decrease In millions of won Increase (decrease) of profit before income tax ￦ (1,439,185 ) 1,439,185 (1,703,053 ) 1,703,053 Increase (decrease) of equity(*) (1,439,185 ) 1,439,185 (1,703,053 ) 1,703,053 (*) The effect on the shareholders’ equity excluding the impact of income taxes.
Summary of Interest Rate Risk	The Company’s borrowings and debt securities with floating interest rates as of December 31, 2021 and 2022 are as follows: Type 2021 2022 In millions of won Short-term borrowings ￦ 391,897 3,154,972 Long-term borrowings 2,405,244 5,388,073 Debt securities 257,667 269,101 ￦ 3,054,808 8,812,146
Summary of Sensitivity Analysis for Interest Rates	A sensitivity analysis on the Company’s long-term borrowings and debt securities assuming a 1% increase and decrease in interest rates, without consideration of hedge effect of related derivatives for the years ended December 31, 2021 and 2022 are as follows: 2021 2022 Type 1% Increase 1% Decrease 1% 1% In millions of won Increase (decrease) of profit before income tax ￦ (30,548 ) 30,548 (88,121 ) 88,121 Increase (decrease) of shareholder’s equity(*) (30,548 ) 30,548 (88,121 ) 88,121 (*) The effect on the shareholders’ equity excluding the impact of income taxes.
Summary of Sensitivity Analysis for Electricity Rates	A sensitivity analysis on the Company’s income for the period assuming a 1% increase and decrease in price of electricity for the years ended December 31, 2021 and 2022 is as follows: 2021 2022 Type 1% Increase 1% Decrease 1% Increase 1% Decrease In millions of won Increase (decrease) of profit before income tax ￦ 573,086 (573,086 ) 661,990 (661,990 ) Increase (decrease) of shareholder’s equity(*) 573,086 (573,086 ) 661,990 (661,990 ) (*) The effect on the equity excluding the impact of income taxes.
Summary of Maturity Analysis for Non Derivative Financial Liabilities	The expected maturities for non-derivative 2021 Type Less than 1 year 1~2 Years 2~5 Years More than 5 years Total In millions of won Borrowings and debt securities ￦ 15,833,589 11,229,657 28,663,693 36,223,543 91,950,482 Lease liabilities 620,121 636,724 1,521,421 2,150,722 4,928,988 Trade and other payables 7,569,869 777,017 725,231 667,304 9,739,421 Financial guarantee contracts(*) 435,729 — 3,105,599 176,687 3,718,015 ￦ 24,459,308 12,643,398 34,015,944 39,218,256 110,336,906 2022 Type Less than 1 year 1~2 Years 2~5 Years More than 5 years Total In millions of won Borrowings and debt securities ￦ 26,157,747 27,367,577 47,361,676 37,115,832 138,002,832 Lease liabilities 639,756 657,210 1,390,374 1,925,012 4,612,352 Trade and other payables 11,369,512 347,563 1,008,133 734,112 13,459,320 Financial guarantee contracts(*) 105,091 54,310 3,495,437 121,222 3,776,060 ￦ 38,272,106 28,426,660 53,255,620 39,896,178 159,850,564 (*) This represents the total guarantee amounts associated with the financial guarantee contracts. Financial guarantee liabilities which are recognized as of December 31, 2021 and 2022 are ￦80,841 million and ￦67,240 million, respectively.
Summary of Maturity Analysis for Non Derivative Financial Assets	The expected maturities for non-derivative 2021 Type Less than 1 year 1~5 Years More than 5 years Other(*) Total In millions of won Cash and cash equivalents ￦ 2,635,238 — — — 2,635,238 Financial assets at fair value through other comprehensive income — — — 435,107 435,107 Financial assets at amortized cost 15,422 9,840 11 — 25,273 Loans 88,396 443,146 407,584 — 939,126 Long-term/short-term financial instruments 1,278,014 171,636 286 278,572 1,728,508 Financial assets at fair value through profit or loss 360,833 346 3,130 668,555 1,032,864 Trade and other receivables 8,123,455 1,233,703 679,048 — 10,036,206 ￦ 12,501,358 1,858,671 1,090,059 1,382,234 16,832,322 2022 Type Less than 1 year 1~5 Years More than 5 years Other(*) Total In millions of won Cash and cash equivalents ￦ 3,234,780 — — — 3,234,780 Financial assets at fair value through other comprehensive income — — 502,829 502,829 Financial assets at amortized cost 16,762 10,231 5 — 26,998 Loans 132,877 411,594 502,050 — 1,046,521 Long-term/short-term financial instruments 666,758 — 25 686,297 1,353,080 Financial assets at fair value through profit or loss 3,181,791 645 3,535 523,537 3,709,508 Trade and other receivables 10,464,191 1,083,593 1,080,831 — 12,628,615 ￦ 17,697,159 1,506,063 1,586,446 1,712,663 22,502,331 (*) The maturities cannot be presently determined.
Summary of Maturity Analysis for Derivative, Undiscounted Cash Flows	Derivative liabilities classified by maturity periods which from reporting date to maturity dates as per the contracts as of December 31, 2021 and 2022 are as follows: 2021 Type Less than 1 year 1~2 Years 2~5 Years More than 5 years Total In millions of won Net settlement —Trading ￦ — — — — — Gross settlement —Trading and others (6,628 ) (4,954 ) (33,635 ) (2,291 ) (47,508 ) —Hedging (2,555 ) (638 ) (1,914 ) (23,704 ) (28,811 ) ￦ (9,183 ) (5,592 ) (35,549 ) (25,995 ) (76,319 ) 2022 Type Less than 1 year 1~2 Years 2~5 Years More than 5 years Total In millions of won Net settlement —Trading ￦ — — — — — Gross settlement —Trading and others (42,663 ) (15,225 ) (171,130 ) (84,924 ) (313,942 ) —Hedging — (10,064 ) (5,176 ) (10,265 ) (25,505 ) ￦ (42,663 ) (25,289 ) (176,306 ) (95,189 ) (339,447 )
Summary of Maturity Analysis for Derivative Financial Assets	Derivative assets classified by maturity periods which from reporting date to maturity dates as per the contracts as of December 31, 2021 and 2022 are as follows: 2021 Type Less than 1 year 1~2 Years 2~5 Years More than 5 years Total In millions of won Net settlement —Trading ￦ — — — — — Gross settlement —Trading 93,554 54,617 202,663 105,856 456,690 —Hedging 33,564 65,198 102,760 3,235 204,757 ￦ 127,118 119,815 305,423 109,091 661,447 2022 Type Less than 1 year 1~2 Years 2~5 Years More than 5 years Total In millions of won Net settlement —Trading ￦ — — — — — Gross settlement —Trading 861,621 160,938 (352,657 ) 65,661 735,563 —Hedging 134,390 47,502 131,258 — 313,150 ￦ 996,011 208,440 (221,399 ) 65,661 1,048,713
Summary of Fair Value Measurement of Instruments	Fair value and book value of financial assets and liabilities as of December 31, 2021 and 2022 are as follows: 2021 2022 Type Book value Fair value Book value Fair value In millions of won Assets recognized at fair value Financial assets at fair value through other comprehensive income ￦ 435,107 435,107 502,829 502,829 Derivative assets (trading) 443,027 443,027 693,072 693,072 Derivative assets (hedge designated) 204,756 204,756 324,952 324,952 Financial assets at fair value through profit or loss 1,032,864 1,032,864 3,709,508 3,709,508 ￦ 2,115,754 2,115,754 5,230,361 5,230,361 Assets carried at amortized cost Financial assets at amortized cost ￦ 25,273 25,273 26,998 26,998 Loans and receivables 909,071 909,071 1,013,371 1,013,371 Trade and other receivables 10,029,276 10,029,276 12,614,902 12,614,902 Long-term financial instruments 450,494 450,494 686,322 686,322 Short-term financial instruments 1,278,014 1,278,014 666,758 666,758 Cash and cash equivalents 2,635,238 2,635,238 3,234,780 3,234,780 ￦ 15,327,366 15,327,366 18,243,131 18,243,131 Liabilities recognized at fair value Derivative liabilities (trading) ￦ 56,256 56,256 407,246 407,246 Derivative liabilities (hedge designated) 21,775 21,775 25,505 25,505 ￦ 78,031 78,031 432,751 432,751 Liabilities carried at amortized cost Secured borrowings ￦ 176,358 176,358 102,368 102,368 Unsecured bond 73,881,671 69,803,043 105,185,189 96,846,056 Lease liabilities 4,410,503 4,410,503 4,163,143 4,163,143 Unsecured borrowings 6,471,484 5,938,613 15,282,193 15,280,693 Trade and other payables(*) 9,739,421 9,739,421 13,459,320 13,459,320 Bank overdraft — — 35,615 35,615 ￦ 94,679,437 90,067,938 138,227,828 129,887,195 (*) Excludes lease liabilities.
Summary of Significant Unobservable Inputs Used in Fair Value Measurement of Liabilities	The discount rates used for calculating fair value as of December 31, 2021 and 2022 are as follows: Type 2021 2022 Derivatives (-) 0.63% ~ 3.88% 0.60% ~ 7.93% Borrowings and debt securities (-) 0.30% ~ 4.38% 0.75% ~ 5.84% Finance lease 0.00% ~ 16.83% 0.00% ~ 17.08%
Summary of Fair Value Measurement of Liabilities	Fair values of financial instruments by hierarchy level as of December 31, 2021 and 2022 are as follows: 2021 Type Level 1 Level 2 Level 3 Total In millions of won Financial assets at fair value Financial assets at fair value through other comprehensive income ￦ 273,826 — 161,281 435,107 Derivative assets — 647,783 — 647,783 Financial assets at fair value through profit or loss — 1,027,067 5,797 1,032,864 ￦ 273,826 1,674,850 167,078 2,115,754 Financial liabilities at fair value Derivative liabilities ￦ — 78,031 — 78,031 2022 Type Level 1 Level 2 Level 3 Total In millions of won Financial assets at fair value Financial assets at fair value through other comprehensive income ￦ 300,057 — 202,772 502,829 Derivative assets — 1,018,024 — 1,018,024 Financial assets at fair value through profit or loss — 3,703,179 6,329 3,709,508 ￦ 300,057 4,721,203 209,101 5,230,361 Financial liabilities at fair value Derivative liabilities ￦ — 432,751 — 432,751
Summary of Reconciliation of Changes in Fair Value Measurement, Assets	Changes of financial assets and liabilities which are classified as level 3 for the years ended December 31, 2021 and 2022 are as follows: 2021 Beginning Acquisitions Reclassified Valuation Disposal Foreign Ending In millions of won Financial assets at fair value Financial assets at fair value through profit or loss Cooperative ￦ 5,692 — — 105 — — 5,797 Financial assets at fair value through other comprehensive income Unlisted securities 163,889 8,929 — (12,335 ) (13 ) 320 160,790 Debt securities — 500 — — — (9 ) 491 2022 Beginning Acquisitions Reclassified Valuation Disposal Foreign Ending In millions of won Financial assets at fair value Financial assets at fair value through profit or loss Cooperative ￦ 5,797 400 — 132 — — 6,329 Financial assets at fair value through other comprehensive income Unlisted securities 160,790 9,451 — 33,237 — (1,235 ) 202,243 Debt securities 491 — — 38 — — 529

Service Concession Arrangemen_2

Service Concession Arrangements (Tables)	12 Months Ended
	Dec. 31, 2022
Disclosure of detailed information about service concession arrangements [abstract]
Hydroelectric Power Generation at Semangka, Indonesia	The Company’s expected future collections of service concession arrangements as of December 31, 2022 are as follows: Type Amounts In millions of won Less than 1 year ￦ 31,653 1 ~ 2 years 31,800 2 ~ 3 years 31,728 Over 3 years 548,400 ￦ 643,581

Related Parties (Tables)

Related Parties (Tables)	12 Months Ended
	Dec. 31, 2022
Disclosure of transactions between related parties [abstract]
Summary of Related Party Transactions	(3) Related party transactions for the years ended December 31, 2020, 2021 and 2022 are as follows: <Sales and Others> Sales and others Company name Transaction type 2020 2021 2022 In millions of won <Associates> Dongducheon Dream Power Co., Ltd. Electricity sales ￦ 7,757 19,923 8,942 Saemangeum Sebit Power Plant Co., Ltd. Electricity sales — — 1,418 Korea Gas Corporation Electricity sales 97,685 96,362 155,309 Daejung Offshore Wind Power Co., Ltd. Electricity sales 32 46 46 Daegu Photovoltaic Co., Ltd. Electricity sales 325 207 268 Haeng Bok Do Si Photovoltaic Power Co., Ltd. Electricity sales 2 2 2 Korea Electric Power Industrial Development Co., Ltd. Service 10,833 11,208 10,369 Goseong Green Power Co., Ltd. Fuel sales 47,701 514,470 1,062,108 Gangneung Eco Power Co., Ltd. Fuel sales 10,178 14,200 459,404 Shin Pyeongtaek Power Co., Ltd. Electricity sales 20,791 23,501 27,486 Noeul Green Energy Co., Ltd. Electricity sales 30 30 9,396 Samcheok Eco Materials Co., Ltd. Electricity sales 700 620 546 YTN Co., Ltd. Electricity sales 1,805 1,922 2,180 Busan Green Energy Co., Ltd. Electricity sales 34 49 5,055 Gunsan Bio Energy Co., Ltd. Electricity sales 102 20 — Korea Electric Vehicle Charging Service (*2) Electricity sales 1,956 3,039 3,686 Energy Infra Asset Management Co., Ltd. Electricity sales — 4,629 — Gangwon Wind Power Co., Ltd. Electricity sales 2,109 1,865 1,549 Gwangyang Green Energy Co., Ltd. Electricity sales 23 486 1,848 Bigeum Resident Photovoltaic Power Co., Ltd. Electricity sales 85 755 660 Hyundai Green Power Co., Ltd. Electricity sales and design 17,257 11,934 7,063 Korea Power Exchange Service 25,919 39,796 16,596 Taebaek Wind Power Co., Ltd. Service 226 44 861 Taebaek Guinemi Wind Power Co., Ltd. Electricity sales 37 26 — Pyeongchang Wind Power Co., Ltd. Electricity sales 2,064 1,180 1,323 Daeryun Power Co., Ltd. Electricity sales 1,947 1,944 2,016 Changjuk Wind Power Co., Ltd. (*) Electricity sales 2,067 463 1,350 GS Donghae Electric Power Co., Ltd. Electricity sales 31,557 21,127 5,238 KNH Solar Co., Ltd. Electricity sales 16 14 13 S-Power Co., Ltd. Service 6,682 5,229 4,588 Chuncheon Green Energy Co., Ltd. Electricity sales — — 2 PND solar Co., Ltd. Electricity sales 409 416 427 Hyundai Eco Energy Co., Ltd. Electricity sales 167 187 277 YeongGwang Yaksu Wind Electric Co., Ltd. Electricity sales 77 78 66 Taebaek Gadeoksan Wind Power Co., Ltd. Electricity sales — 295 1,952 Korea Energy Solutions Co., Ltd. Electricity sales 7 2 2 ITR Co., Ltd. Service — 3 6 Structure test network Co., Ltd. Service — 5 7 <Sales and Others>, continued Sales and others Company name Transaction type 2020 2021 2022 In millions of won <Associates> Namjeongsusang Solar Power Operation Co., Ltd. Electricity sales ￦ 14 22 21 Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 Service 291 399 394 Bitgoel Eco Energy Co., Ltd. Electricity sales — 282 1,397 Jeju Gimnyeong Wind Power Co., Ltd. Electricity sales — — 367 Seoroseoro Sunny Power Plant Co., Ltd. Electricity sales — — 1 Muan Solar park Co., Ltd. Electricity sales 57 232 950 YuDang Solar Co., Ltd. Electricity sales — — 160 Anjwa Smart Farm & Solar City Co., Ltd. Electricity sales — 624 1,068 Daewon Green Energy Co., Ltd. Electricity sales — 155 185 Saemangeum Heemang Photovoltaic Co., Ltd. Electricity sales — 13 5,740 UD4M Co., Ltd. Electricity sales — 4 2 Dongbu Highway Solar Co., Ltd. Electricity sales — 5 8 Seobu Highway Solar Co., Ltd. Electricity sales — 8 8 SureDataLab Co., Ltd. Electricity sales — 1 1 Suwon New Power Co., Ltd. Electricity sales 2,974 1,820 118 Hankook Electric Power Information Co., Ltd. Electricity sales — 1 — Kosture Co., Ltd. Electricity sales — 1 5 PlatformN. Co., Ltd. Others — — 14 Muan Sunshine Solar Power Plant Co., Ltd. Electricity sales 30 52 17 Gangneung Sacheon Fuel Cell Co., Ltd. Electricity sales — — 151 12 Associates (Overseas) Electricity sales 66,755 125,723 548,507 <Joint ventures> Seobusambo highway photovoltaics Co., Ltd. Electricity sales — — 3 Naepo Green Energy Co., Ltd. Electricity sales 217 467 761 Cheongna Energy Co., Ltd. Others 13,791 16,469 39,802 Dayone Energy Co., Ltd. Service 4,816 8,159 7,761 Daegu Green Power Co., Ltd. Electricity sales 1,285 1,053 1,190 Prime Swedish Holding AB Electricity sales — — 284 KAPES, Inc. Commission 476 413 450 Honam Wind Power Co., Ltd. Electricity sales 502 71 242 Jeongam Wind Power Co., Ltd. Electricity sales 1,213 588 — Korea Power Engineering Service Co., Ltd. Service 203 339 268 Seokmun Energy Co., Ltd. Service 1,932 1,701 1,685 Incheon New Power Co., Ltd. Construction 14 14 14 Chun-cheon Energy Co., Ltd. Electricity sales 2,657 2,329 2,505 Yeonggwangbaeksu Wind Power Co., Ltd. Electricity sales 1,788 1,836 1,898 Yeonggwang Wind Power Co., Ltd. Electricity sales 793 818 871 Western Power Changgi Solar Co., Ltd. (formerly, Sam-Yang Electricity sales 33 1,920 — NH-Amundi Service 1,388 1,727 1,415 <Sales and Others>, continued Sales and others Company name Transaction type 2020 2021 2022 In millions of won KW Nuclear Components Co., Ltd. Service ￦ 1,639 2,598 1,624 KEPCO-Uhde Inc. Electricity sales 8 10 12 Busan Shinho Solar Power Co., Ltd. Electricity sales 353 376 502 Goheung New Energy Co., Ltd. Electricity sales — — 141 Gunsan Land Solar Co., Ltd. Electricity sales — — 518 Daesan Green Energy Co., Ltd. Electricity sales 703 523 394 Cheong-Song Noraesan Wind Power Co., Ltd. Electricity sales 29 30 698 Chungsongmeon BongSan wind power Co., Ltd. Electricity sales — 1 1 Saemangeum Solar Power Co., Ltd. Service 2,846 1,141 100 Dangjin Eco Power Co., Ltd. Electricity sales 33 32 32 Energyco Co., Ltd. Electricity sales — 1 463 Hapcheon Floating Photovoltaic Power Plant Inc. Electricity sales — — 544 Busan Industrial Solar Power Co., Ltd. Electricity sales — 9 14 Bitsolar Energy Co., Ltd. Electricity sales 42 296 498 Omisan Wind Power Co., Ltd. Electricity sales — 1 1 Haemodum Solar Co., Ltd. Electricity sales 4 6 42 Yeongam Solar Power Co., Ltd. Electricity sales 165 339 379 Solaseado Solar Power Co., Ltd. Electricity sales 66 2,890 1,851 Cheongju Eco Park Co., Ltd. Electricity sales — — 204 Enel X Midland Photovoltaic, LLC Electricity sales — — 12 Eumseong Eco Park Co., Ltd. Electricity sales — — 2 Geumsungsan Wind Power Co., Ltd. Electricity sales — — 7 37 Joint ventures (Overseas) Electricity sales 831,596 773,291 606,513 <Others> Korea Development Bank Electricity sales 4,248 4,177 4,134 Interest income 3,461 756 2,222 <Purchase and Others> Purchase and others Company name Transaction type 2020 2021 2022 In millions of won <Associates> Dongducheon Dream Power Co., Ltd. Electricity sales ￦ 552,692 750,148 2,244,332 Saemangeum Sebit Power Plant Co., Ltd. Electricity sales — — 23,159 Korea Gas Corporation Fuel purchase 3,270,972 5,646,713 11,996,402 Daegu Photovoltaic Co., Ltd. Electricity sales 3,313 3,532 4,744 Haeng Bok Do Si Photovoltaic Power Co., Ltd. Electricity sales 370 393 563 Korea Electric Power Industrial Development Co., Ltd. Service 212,366 241,925 251,468 Goseong Green Power Co., Ltd. Electricity sales — 987,540 1,905,502 Shin Pyeongtaek Power Co., Ltd. Electricity sales 520,737 653,306 957,294 Noeul Green Energy Co., Ltd. Electricity sales 10,634 10,014 14,176 Samcheok Eco Materials Co., Ltd. Electricity sales 10,713 13,612 12,019 YTN Co., Ltd. Electricity sales 353 388 304 Busan Green Energy Co., Ltd. Electricity sales 18,678 18,996 26,219 Korea Electric Vehicle Charging Service (*2) Electricity sales 581 393 — Energy Infra Asset Management Co., Ltd. Service — 2,657 2,779 Yaksu ESS Co., Ltd. Electricity sales 217 1,715 851 Gangwon Wind Power Co., Ltd. Electricity sales 23,350 19,623 40,130 Goesan Solar park Co., Ltd. Electricity sales — 6,209 7,642 Korea Power Exchange Service 87,361 86,716 93,817 Taebaek Wind Power Co., Ltd. Service and REC 4,003 5,930 7,442 Taebaek Guinemi Wind Power Co., Ltd. Electricity sales 5,023 5,910 6,793 Pyeongchang Wind Power Co., Ltd. Design service and others 3,969 4,099 3,884 Daeryun Power Co., Ltd. Electricity sales 99,523 157,234 428,534 Changjuk Wind Power Co., Ltd. (*1) Electricity sales 6,084 6,213 9,027 GS Donghae Electric Power Co., Ltd. Electricity sales 660,351 760,377 1,035,263 KNH Solar Co., Ltd. Electricity sales 3,564 3,222 4,348 S-Power Service 293,515 608,530 1,091,741 PND Solar Co., Ltd. Electricity sales 5,234 5,502 6,173 Hyundai Eco Energy Co., Ltd. Electricity sales 17,777 25,762 29,209 YeongGwang Yaksu Wind Electric Co., Ltd. Electricity sales 9,151 11,729 7,382 Taebaek Gadeoksan Wind Power Co., Ltd. Electricity sales — 16,360 25,880 Korea Energy Solutions Co., Ltd. Electricity sales — — 102 Green Energy Electricity Generation Co., Ltd. Electricity sales — 1,238 2,962 Namjeongsusang Solar Power Operation Co., Ltd. Electricity sales — 14,286 9,491 Bitgoel Eco Energy Co., Ltd. Service and others — — 930 Jeju Gimnyeong Wind Power Co., Ltd. Electricity sales — 12,833 12,364 Seoroseoro Sunny Power Plant Co., Ltd. REC and others — 217 1,138 Muan Solar Park Co., Ltd. REC and others — 31,017 17,052 YuDang Solar Co., Ltd. REC and others — 3,495 1,915 Anjwa Smart Farm & Solar City Co., Ltd. Electricity sales — 24,601 16,942 Daewon Green Energy Co., Ltd. Others — — 42,651 Saemangeum Heemang Photovoltaic Co., Ltd. Electricity sales — — 1,039 G.GURU Co., Ltd. Electricity sales — — 452 UD4M Co., Ltd. Electricity sales — — 313 Dongbu Highway Solar Co., Ltd. Electricity sales — 2,605 3,516 Seobu Highway Solar Co., Ltd. Electricity sales — 2,936 3,452 Gwangbaek Solar Power Investment Co., Ltd. Electricity sales 373 742 602 PlatformN. Co., Ltd. Others — — 475 Purchase and others Company name Transaction type 2020 2021 2022 In millions of won <Associates> Muan Sunshine Solar Power Plant Co., Ltd. Electricity sales ￦ — 15,900 19,514 12 Associates (Overseas) Electricity sales — 502 101,790 <Joint ventures> Seobusambo highway photovoltaics Co., Ltd. Electricity sales — — 103 Cheongna Energy Co., Ltd. Service 66 57 80 Dayone Energy Co., Ltd. Service 1,120 5,409 13,872 Daegu Green Power Co., Ltd. Electricity sales 215,224 289,052 508,601 KAPES, Inc. Commission 219,673 64,140 9,306 Honam Wind Power Co., Ltd. Electricity sales 4,382 4,807 7,662 Jeongam Wind Power Co., Ltd. Electricity sales 5,982 3,145 — Korea Power Engineering Service Co., Ltd. Service 1,594 1,315 830 Seokmun Energy Co., Ltd. Service 33,164 44,315 60,799 Chun-cheon Energy Co., Ltd. Electricity sales 222,069 327,536 585,689 Yeonggwangbaeksu Wind Power Co., Ltd. Electricity sales 11,232 9,471 13,990 Yeonggwang Wind Power Co., Ltd. Electricity sales 24,103 21,004 31,221 Western Power Changgi Solar Co., Ltd. (formerly, Sam-Yang Electricity sales 3,848 5,852 — KW Nuclear Components Co., Ltd. Service — 96 9,504 Busan Shinho Solar Power Co., Ltd. Electricity sales 7,296 7,895 10,601 Global Trade Of Power System Co., Ltd. Service 337 323 715 Expressway Solar-light Power Generation Co., Ltd. Electricity sales 2,472 3,146 4,016 Gunsan Land Solar Co., Ltd. Electricity sales — — 533 Daesan Green Energy Co., Ltd. Electricity sales 104,854 146,776 129,736 Cheong-Song Noraesan Wind Power Co., Ltd. Electricity sales — — 980 Saemangeum Solar Power Co., Ltd. Electricity sales — 5 1 Dangjin Eco Power Co., Ltd. Electricity sales 3,953 4,139 5,696 Energyco Co., Ltd. Electricity sales — — 7,898 Hapcheon Floating Photovoltaic Power Plant Inc. Service and REC — — 2,526 Busan Industrial Solar Power Co., Ltd. Electricity sales 19 2,815 4,575 Bitsolar Energy Co., Ltd. Electricity sales — 5,703 13,030 Omisan Wind Power Co., Ltd. Electricity sales — 7 — Haemodum Solar Co., Ltd. Electricity sales 967 1,625 2,168 Yeongam Solar Power Co., Ltd. Electricity sales 32,208 47,805 44,745 Samsu Wind Power Co., Ltd. Electricity sales — 2,800 10,605 Solaseado Solar Power Co., Ltd. Electricity sales 28,516 31,031 28,698 Cheongju Eco Park Co., Ltd. Electricity sales — — 94,409 Enel X Midland Photovoltaic, LLC Electricity sales — — 1,871 37 Joint ventures (Overseas) Electricity sales 14,767 54,135 16,859 <Others> Korea Development Bank Interest expense 3,872 2,756 4,208 Dividends paid 17 256,862 12 (*1) Reclassified from a joint venture to a subsidiary during the year ended December 31, 2022. Transactions are made before the reclassification. (*2) The Company has disposed of shares of Korea Electric Vehicle Charging Service during the year ended December 31, 2022, and it is not a related party to the Group as of December 31, 2022.
Summary of Receivables and Payables Arising From Related Party Transactions	(4) Receivables and payables arising from related party transactions as of December 31, 2021 and 2022 are as follows: Receivables Payables Company name Type 2021 2022 2021 2022 In millions of won <Associates> Dongducheon Dream Power Co., Ltd. Trade receivables ￦ 6,282 592 — — Non-trade 493 270 — — Trade payables — — 114,613 293,256 Saemangeum Sebit Power Plant Co., Ltd. Non-trade receivables and others — 653 — — Korea Gas Corporation (*1) Trade receivables 10,015 12,415 — — Non-trade 187 54,232 — — Trade payables — — 800,509 1,882,607 Non-trade — — 759 1,294 Daejung Offshore Wind Power Co., Ltd. Non-trade 77 123 — — Daegu Photovoltaic Co., Ltd. Trade payables — — 115 135 Non-trade payables and others — — — 2 Korea Electric Power Industrial Development Co., Ltd. Trade receivables 269 164 — — Non-trade 15 2 — — Trade payables — — 873 150 Non-trade — — 5,880 9,588 Goseong Green Power Co., Ltd. Trade receivables 495 76,254 — — Non-trade 76,855 14 — — Trade payables — — 218,627 182,095 Non-trade — — 59,987 52,515 Gangneung Eco Power Co., Ltd. Trade receivables 826 19,364 — — Non-trade 465 478 — — Non-trade — — 97 94 Shin Pyeongtaek Power Co., Ltd. Trade receivables 1,788 7,375 — — Non-trade 3,116 1,068 — — Trade payables — — 79,828 109,274 Non-trade — — 99 101 Noeul Green Energy Co., Ltd. Trade receivables 3 3 — — Non-trade 1,169 9,365 — — Non-trade payables and others — — — 2,468 Samcheok Eco Materials Co., Ltd. Trade receivables 52 46 — — YTN Co., Ltd. Trade receivables 99 112 — — Busan Green Energy Co., Ltd. Trade receivables 1 1 — — Non-trade 20,658 26,681 — — Non-trade payables and others — — — 4,415 Gunsan Bio Energy Co., Ltd. Non-trade 11,728 11,728 — — Korea Electric Vehicle Charging Service (*4) Trade receivables 193 — — — Non-trade 120 — — — Yaksu ESS Co., Ltd. Trade payables — — 1,374 — Gangwon Wind Power Co., Ltd. Trade receivables 8 6 — — Trade payables — — 4,293 5,197 Gwangyang Green Energy Co., Ltd. Non-trade 532 1,436 — — Bigeum Resident Photovoltaic Power Co., Ltd. Trade receivables 922 343 — — Non-trade receivables and others — 516 — — Goesan Solar park Co., Ltd. Trade payables — — 73 346 Hyundai Green Power Co., Ltd. Trade receivables 229 839 — — Korea Power Exchange Trade receivables 627 223 — — Non-trade 1,300 — — — Non-trade — — 2,189 2,405 Taebaek Wind Power Co., Ltd. Trade payables — — 560 680 Non-trade — — 262 178 Taebaek Guinemi Wind Power Co., Ltd. Trade payables — — 670 885 Pyeongchang Wind Power Co., Ltd. Trade receivables 4 3 — — Non-trade — — — 211 Daeryun Power Co., Ltd. Trade receivables 213 195 — — Trade payables — — 21,362 55,725 Changjuk Wind Power Co., Ltd. (*3) Trade payables — — 724 — Non-trade — — 295 — Receivables Payables Company name Type 2021 2022 2021 2022 In millions of won <Associates> GS Donghae Electric Power Co., Ltd. (*2) Trade receivables ￦ 383 872 — — Non-trade receivables and others 272 1,558 — — Trade payables — — 113,529 72,947 Non-trade payables and others — — 17 14,565 KNH Solar Co., Ltd. Trade receivables 1 1 — — S-Power Trade receivables 82 77 — — Non-trade 48 44 — — Trade payables — — 91,277 135,504 Non-trade payables and others — — — 11 PND solar Co., Ltd. Trade payables — — — 210 Hyundai Eco Energy Co., Ltd. Trade receivables 19 22 — — Trade payables — — 732 738 YeongGwang Yaksu Wind Electric Co., Ltd. Trade receivables 6 7 — — Trade payables — — — 589 Non-trade payables and others — — — 2,050 Taebaek Gadeoksan Wind Power Co., Ltd. Non-trade receivables and others 119 97 — — Trade payables — — 8,397 12,739 Non-trade payables and others — — 1,571 5 Korea Energy Solutions Co., Ltd. Non-trade payables and others — — — 94 Namjeongsusang Solar Power Operation Co., Ltd. Trade receivables — 2 — — Bitgoel Eco Energy Co., Ltd. Non-trade receivables and others 27 6 — — Non-trade payables and others — — — 1,023 Jeju Gimnyeong Wind Power Co., Ltd . Non-trade receivables and others — 130 — — Trade payables — — 885 1,758 Muan Solar park Co., Ltd. Trade receivables — 25 — — Non-trade receivables and others 23 9 — — Anjwa Smart Farm & Solar City Co., Ltd. Non-trade payables and others — — — 921 Daewon Green Energy Co., Ltd. Trade receivables — 1 — — Non-trade receivables and others 94 — — — Trade payables — — — 5,485 Saemangeum Heemang Photovoltaic Co., Ltd. Non-trade — 3,435 — — Non-trade — — — 1 Dongbu Highway Solar Co., Ltd. Trade receivables 1 1 — — Trade payables — — 98 2 Non-trade — — 90 2 Seobu Highway Solar Co., Ltd. Trade receivables — 1 — — Trade payables — — 177 8 Non-trade payables and others — — 105 3 Gwangbaek Solar Power Investment Co., Ltd. Non-trade payables and others — — — 61 Suwon New Power Co., Ltd. Non-trade receivables and others 1,198 1,280 — — Tronix Co., Ltd. Non-trade — 1 — — KOSTURE Co., Ltd. Trade receivables 1 6 — — Muan Sunshine Solar Power Plant Co., Ltd. Trade payables — — 1,748 3,076 Non-trade — — — 1,265 PlatformN. Co., Ltd. Non-trade payables and others — — — 232 8 Associates (Overseas) Trade receivables — 93 — — Non-trade receivables and others 3,196 49,409 — — Non-trade payables and others — — 502 502 <Joint ventures> Naepo Green Energy Co., Ltd. Trade receivables 42 169 — — Non-trade — — — 3 Dayone Energy Co., Ltd. Trade receivables 52 79 — — Non-trade 13,297 10,218 — — Trade payables — — 1,009 1,027 Non-trade — — 11,306 9,119 Daegu Green Power Co., Ltd. Trade receivables 71 53 — — Non-trade 55 56 — — Trade payables — — 35,766 66,715 Receivables Payables Company name Type 2021 2022 2021 2022 In millions of won <Joint ventures> KAPES, Inc. Trade receivables ￦ 2 2 — — Non-trade — — 2,121 106 Honam Wind Power Co., Ltd. Trade payables — — 575 515 Korea Power Engineering Service Co., Ltd. Non-trade receivables and others 48 47 — — Non-trade — — — 77 Seokmun Energy Co., Ltd. Trade receivables 34 67 — — Non-trade 149 113 — — Trade payables — — 7,941 7,000 Chun-cheon Energy Co., Ltd. Trade receivables 126 124 — — Non-trade 167 165 — — Trade payables — — 41,410 79,117 Yeonggwangbaeksu Wind Power Co., Ltd. Trade receivables 6 8 — — Non-trade receivables and others 53 166 — — Trade payables — — 1,099 1,076 Cheongna Energy Co., Ltd. Trade receivables 4,164 17,324 — — Non-trade receivables and others 1,350 1,654 — — Non-trade — — 1 1 Yeonggwang Wind Power Co., Ltd. Trade receivables 10 12 — — Non-trade 59 62 — — Trade payables — — 730 2,251 Western Power Changgi Solar Co., Ltd. (formerly, Sam-Yang Photovoltaic Power Co., Ltd.) (*3) Trade receivables 5 — — — KW Nuclear Components Co., Ltd. Trade receivables — 4 — — Non-trade — 18 — — KEPCO-Uhde Inc. Non-trade — — 10 10 Busan Shinho Solar Power Co., Ltd. Trade receivables 2 3 — — Trade payables — — 281 304 Global Trade Of Power System Co., Ltd. Non-trade payables and others — — 7 — Expressway Solar-light Power Generation Co., Ltd. Trade payables — — 102 166 Gunsan Land Solar Co., Ltd. Non-trade receivables and others — 138 — — Daesan Green Energy Co., Ltd. Trade receivables 11 18 — — Non-trade 120 218 — — Trade payables — — 5,120 4,946 Cheong-Song Noraesan Wind Power Co., Ltd. Trade receivables 2 2 — — Saemangeum Solar Power Co., Ltd. Non-trade 4,268 4,368 — — Dangjin Eco Power Co., Ltd. Trade receivables 3 3 — — Trade payables — — 276 222 Non-trade payables and others — — — 105 Hapcheon Floating Photovoltaic Power Plant Inc. Trade receivables — 9 — — Busan Industrial Solar Power Co., Ltd. Trade receivables 1 2 — — Trade payables — — 54 — Non-trade receivables and others — — 24 — Bitsolar Energy Co., Ltd. Non-trade receivables and others 7 222 — — Trade payables — — — 201 Non-trade payables and others — — 54 — Haemodum Solar Co., Ltd. Trade receivables 1 1 — — Yeongam Solar Power Co., Ltd. Trade receivables 29 44 — — Trade payables — — 3,324 3,655 Samsu Wind Power Co., Ltd. Trade payables — — 1,300 1,303 Solaseado Solar Power Co., Ltd. Non-trade receivables and others — 23 — — Non-trade payables and others — — — 2,911 Cheongju Eco Park Co., Ltd. Trade payables — — — 7,994 Enel X Midland Photovoltaic, LLC Trade receivables — 1 — — Trade payables — — — 3 Geumsungsan Wind Power Co., Ltd. Trade receivables — 3 — — Non-trade payables and others — — — 1 22 Joint ventures (Overseas) Trade receivables 84,150 73,805 — — Non-trade receivables and others 26,060 71,661 — — Non-trade payables and others — — 22,050 117,754 Receivables Payables Company name Type 2021 2022 2021 2022 In millions of won <Others> Korea Development Bank Accrued interest income ￦ 154 5 — — Non-trade receivables and others 420,732 30,836 — — Non-trade payables and others — — 21,172 101 Derivatives 59,139 67,662 — 3,759 (*1) The balance due to the fuel swap with Korea Midland Power Co., Ltd. is included. The total transaction amount is ￦514,405 million on loans and ￦460,903 million on bororrowings. (*2) The balance due to the fuel swap with Korea Western Power Co., Ltd. and Korea East-West Power Co., Ltd. is included. The total transaction amount is ￦5,590 million on loans and ￦20,113 million on bororrowings. (*3) Reclassified from a joint venture to a subsidiary during the year ended December 31, 2022. Transactions are made before the reclassification. (*4) The Company has disposed of shares of Korea Electric Vehicle Charging Service during the year ended December 31, 2022, and it is not a related party to the Group as of December 31, 2022.
Summary of Loans and Others Arising From Related Party Transaction	(5) Loans and others arising from related party transactions as of December 31, 2021 and 2022 are as follows: Type Company name Beginning Loans Collection Others Ending balance In millions of won Associates KNOC Nigerian East Oil Co., Ltd., KNOC Nigerian West Oil Co., Ltd. ￦ 29,481 104 — 1,888 31,473 (Allowance for doubtful accounts) (8,241 ) — — (2,510 ) (10,751 ) Associates Nepal Water & Energy Development Company Private Limited — 19,914 — — 19,914 Associates Xe-Pian Xe-Namnoy 21,456 — — 1,480 22,936 Associates PT Wampu Electric Power 13,000 — (5,233 ) 1,404 9,171 Associates PT Cirebon Energi Prasarana — 28,100 — 1,469 29,569 Associates Gunsan Bio Energy Co., Ltd. 12,396 — — — 12,396 (Allowance for doubtful accounts) (12,396 ) — — — (12,396 ) Associates Bigeum Resident Photovoltaic Power Co., Ltd. 11,212 — — — 11,212 Associates Daejung Offshore Wind Power Co., Ltd. 1,000 — — — 1,000 Associates Bitgoel Eco Energy Co., Ltd. 19,349 16,151 (710 ) — 34,790 Associates Saemangeum Sebit Power Plant Co., Ltd — 37,249 — — 37,249 Joint ventures Solaseado Solar Power Co., Ltd. 35,000 — — — 35,000 Joint ventures Recursos Solares PV de Mexico II, S.A. de C.V. 6,134 1,899 — 424 8,457 Joint ventures Horus Solar, S.A. de C.V. 16,514 1,695 — 1,078 19,287 Joint ventures Sunmex Renovables, S.A. de C.V. 13,571 1,913 — 899 16,383 Joint ventures Kelar S.A. 43,167 — — 798 43,965 Joint ventures DE Energia SpA 6,791 — — 469 7,260 Joint ventures Daehan Wind Power PSC 13,674 — — 944 14,618 Joint ventures PT. Tanjung Power Indonesia 1,090 — (1,114 ) 24 — Joint ventures Bitsolar Energy Co., Ltd. 3,165 — — — 3,165 Joint ventures Daesan Green Energy Co., Ltd. — 3,514 — — 3,514 Joint ventures Nghi Son 2 Power LLC — 185,306 — 1,429 186,735 Joint ventures Pulau Indah Power Plant Sdn. Bhd. — 10,475 — (268 ) 10,207 Joint ventures Guadalupe Solar SpA 3,360 — (253 ) 237 3,344 Joint ventures Foresight Iberian Solar Group Holding, S.L. 59,333 — — 1,969 61,302 Joint ventures Capman Lynx SCA, SICAR 29,770 — — 1,858 31,628 (Allowance for doubtful accounts) — (4,467 ) — — (4,467 ) Joint ventures S-Power Chile SpA — 253 — — 253 ￦ 318,826 302,106 (7,310 ) 13,592 627,214
Summary of Borrowings Arising From Related Party Transactions	(6) Borrowings arising from related party transactions as of December 31, 2021 and 2022 are as follows: Related parties Type Beginning balance Borrowings Repayment Others Ending balance In millions of won Korea Development Bank Facility ￦ 98,020 61,092 (64,875 ) 2,347 96,584 Others 2,509 — (376 ) — 2,133 Operating funds 184,300 164,252 (285,961 ) (158 ) 62,433 Syndicated Loans 14,530 — (1,040 ) (1,035 ) 12,455 EBL and others 53,965 76,878 (85,010 ) 3,059 48,892 ￦ 353,324 302,222 (437,262 ) 4,213 222,497
Summary of Guarantees Provided To Associates Or Joint Ventures	(7) Guarantees provided to related parties as of December 31, 2022 are as follows: Primary guarantor Principal obligor Type of guarantees Credit limit Creditor In millions of won Korea Electric Power Corporation Shuweihat Asia Operation & Maintenance Company Performance guarantees USD 11,000 Shuweihat Asia Power Investment B.V. Korea Electric Power Corporation Rabigh Operation & Maintenance Company Limited Performance guarantees and others USD 1,387 Rabigh Electricity Company Korea Electric Power Corporation Nghi Son 2 Power LLC Performance guarantees USD 70,000 SMBC Ho Chi Minh and others Korea Electric Power Corporation Barakah One Company Debt guarantees USD 1,223,355 Export-Import Bank of Korea and others Performance guarantees and others USD 4,197,287 Korea Electric Power Corporation RE Holiday Holdings LLC Performance guarantees(*9) USD 222,077 EFS Renewables Holdings, LLC, CA-CIB and others Korea Electric Power Corporation RE Pioneer Holdings LLC Performance guarantees USD 106,873 EFS Renewables Holdings, LLC Korea Electric Power Corporation RE Barren Ridge 1 Holdings LLC Performance guarantees(*9) USD 68,838 Firstar Development, LLC Korea Electric Power Corporation Rabigh Electricity Company Performance guarantees SAR 1,509 Hana Bank Korea Electric Power Corporation Shuweihat Asia Power Investment B.V. Performance guarantees USD 100,000 ING Bank Korea Electric Power Corporation Amman Asia Electric Power Company Performance guarantees USD 16,800 Shinhan Bank Korea Electric Power Corporation Horus Solar, S.A. de C.V. Other performance guarantees MXN 16,413 CENACE and others Korea Electric Power Corporation Recursos Solares PV de Mexico II, S.A. de C.V. Other performance guarantees MXN 1,518 SEMARNAT USD 393 CFE Transmission Korea Electric Power Corporation Sunmex Renovables, S.A. de C.V. Other performance guarantees USD 9,078 CENACE MXN 3,666 SEMARNAT Korea Electric Power Corporation International Offshore Power Transmission Holding Company Limited Performance guarantees USD 150,000 Mizuho Bank Other performance guarantees USD 7,000 Credit Agricole Korea Electric Power Corporation Pulau Indah Power Plant Sdn. Bhd.(*11) Collateralized money invested KRW 13,210 Malaysian Trustee Berhad Korea Western Power Co., Ltd. Cheongna Energy Co., Ltd. Collateralized money invested KRW 10,758 Kookmin Bank and others Guarantees for supplemental funding(*1) — Korea Western Power Co., Ltd. Xe-Pian Xe-Namnoy Power Co., Ltd. Collateralized money invested KRW 115,584 Krung Thai Bank Impounding bonus guarantees USD 5,000 SK E&C Korea Western Power Co., Ltd. Rabigh Operation & Maintenance Company Limited Performance guarantees and others SAR 11,200 National Bank of Kuwait Korea Western Power Co., Ltd. Daegu Photovoltaic Co., Ltd. Collateralized money invested KRW 2,849 Korea Development Bank Korea Western Power Co., Ltd. Dongducheon Dream Power Co., Ltd. Collateralized money invested(*5) KRW 52,476 Kookmin Bank and others Debt guarantees KRW 20,300 BNK Securities Korea Western Power Co., Ltd. PT. Mutiara Jawa Collateralized money invested KRW 3,597 Woori Bank Korea Western Power Co., Ltd. Haeng Bok Do Si Photovoltaic Power Co., Ltd. Collateralized money invested KRW 278 Nonghyup Bank Korea Western Power Co., Ltd. Shin Pyeongtaek Power Co., Ltd. Collateralized money invested KRW 133,823 Kookmin Bank and others Guarantees for supplemental funding(*1) — Korea Western Power Co., Ltd. Haemodum Solar Co., Ltd. Collateralized money invested KRW 3,367 Nonghyup Bank Korea Western Power Co., Ltd. Muan Solar Park Co., Ltd. Collateralized money invested KRW 7,838 IBK and others Korea Western Power Co., Ltd. Anjwa Smart Farm & Solar City Co., Ltd. Collateralized money invested KRW 8,662 Hana Bank and others Korea Western Power Co., Ltd. Seoroseoro Sunny Power Plant Co., Ltd. Collateralized money invested KRW 859 Hana Bank and others Korea Western Power Co., Ltd. YuDang Solar Co., Ltd. Collateralized money invested KRW 586 Hana Bank and others Guarantees for supplemental funding(*1) — Korea Western Power Co., Ltd. Hapcheon Floating Photovoltaic Power Plant Inc. Collateralized money invested KRW 8,471 Nonghyup Bank and others Korea Western Power Co., Ltd. Yeongwol Eco Wind Co., Ltd. Collateralized money invested KRW 3,155 Hana Bank and others Guarantees for supplemental funding(*1) — Korea Western Power Co., Ltd. Gurae Resident Power Co., Ltd. Collateralized money invested KRW 391 Hana Bank and others Guarantees for supplemental funding(*1) — Korea Western Power Co., Ltd Gunsan Land Solar Co., Ltd. Collateralized money invested KRW 27,544 Hana Bank and others Guarantees for supplemental funding(*1) — Korea Western Power Co., Ltd Seobusambo highway photovoltaics Co., Ltd. Collateralized money invested KRW 3,067 Hana Bank and others Guarantees for supplemental funding(*1) — Korea Western Power Co., Ltd Eumseong Eco Park Co., Ltd. Collateralized money invested KRW 5,557 Kyobo Life Insurance Co., Ltd. and others Guarantees for supplemental funding(*1) — Primary guarantor Principal obligor Type of guarantees Credit limit Creditor In millions of won Korea Western Power Co., Ltd PungBack Wind Farm Corporation Collateralized money invested KRW 6,743 Hanwha Life Insurance Co., Ltd and others Korea East-West Power Co., Ltd. Busan Shinho Solar Power Co., Ltd. Collateralized money invested KRW 6,719 Korea Development Bank and others Korea East-West Power Co., Ltd. Seokmun Energy Co., Ltd. Collateralized money invested KRW 17,336 Kookmin Bank and others Guarantees for supplemental funding(*1) — Korea East-West Power Co., Ltd. Chun-cheon Energy Co., Ltd. Collateralized money invested KRW 32,044 Kookmin Bank and others Guarantees for supplemental funding(*1) KRW 90,800 Korea East-West Power Co., Ltd. Honam Wind Power Co., Ltd. Collateralized money invested KRW 4,819 Shinhan Bank and others Guarantees for supplemental funding(*1) — Korea East-West Power Co., Ltd. GS Donghae Electric Power Co., Ltd. Collateralized money invested KRW 260,145 Korea Development Bank and others Korea East-West Power Co., Ltd. Yeonggwangbaeksu Wind Power Co., Ltd. Collateralized money invested KRW 3,151 Kookmin Bank and others Korea East-West Power Co., Ltd. Yeonggwang Wind Power Co., Ltd. Collateralized money invested KRW 20,713 KDB Capital Corporation and others Korea East-West Power Co., Ltd. Daesan Green Energy Co., Ltd. Collateralized money invested KRW 19,218 IBK Guarantees for supplemental funding(*1) — Korea East-West Power Co., Ltd. Taebaek Gadeoksan Wind Power Co., Ltd. Collateralized money invested KRW 20,040 Hana Bank and others Guarantees for supplemental funding(*1) — Korea East-West Power Co., Ltd. PT. Tanjung Power Indonesia Other guarantees USD 3,150 PT. Adaro Indonesia Guarantees for supplemental funding(*1) — Sumitomo mitsui banking and others Collateralized money invested KRW 92,907 MUFG and others Korea East-West Power Co., Ltd. South Jamaica Power Company Limited Performance guarantees USD 14,400 Credit Agricole Corporate & Investment Bank Seoul and others Collateralized money invested KRW 46,437 JCSD Trustee Services Limited and others Korea East-West Power Co., Ltd. DE Energia SpA Collateralized money invested KRW 9,536 Mirae Asset Daewoo Co., Ltd. and others Collateralized loans USD 5,728 Payment guarantees(*7) USD 943 Hana Bank Korea East-West Power Co., Ltd. Bitsolar Energy Co., Ltd. Collateralized money invested KRW 352 Mirae Asset Life Insurance Co., Ltd. and others Korea East-West Power Co., Ltd. Cheongju Eco Park Co., Ltd. Collateralized money invested KRW 10,490 Kyobo Life Insurance Co., Ltd. and others Korea East-West Power Co., Ltd. Busan Industrial Solar Power Co., Ltd. Collateralized money invested KRW 1,168 Shinhan Bank and others Guarantees for supplemental funding(*1) — Korea East-West Power Co., Ltd. Yangyang Wind Power Co., Ltd. Collateralized money invested KRW 10,864 Hana Bank and others Guarantees for supplemental funding(*1) — Korea East-West Power Co., Ltd. Daewon Green Energy Co., Ltd. Collateralized money invested KRW 4,485 Hana Bank and others Guarantees for supplemental funding(*1) — Korea East-West Power Co., Ltd. Goheung New Energy Co., Ltd. Collateralized money invested KRW 3,615 Woori Bank and others Guarantees for supplemental funding(*1) — Korea East-West Power Co., Ltd. Seungmun Green Energy Collateralized money invested KRW 9,055 Hana Bank and others Korea Southern Power Co., Ltd. KNH Solar Co., Ltd. Collateralized money invested KRW 2,883 Shinhan Bank and others Performance guarantees and guarantees for supplemental funding(*1) — Korea Southern Power Co., Ltd. Daeryun Power Co., Ltd. Collateralized money invested KRW 26,727 Korea Development Bank and others Korea Southern Power Co., Ltd. Daegu Green Power Co., Ltd. Collateralized money invested KRW 29,360 Shinhan Bank and others Performance guarantees — Korea Southern Power Co., Ltd. Kelar S.A. Performance guarantees USD 54,282 Hana Bank, MUFG Korea Southern Power Co., Ltd. Daehan Wind Power PSC Performance guarantees USD 1,800 Shinhan Bank Payment guarantees(*6) USD 1,900 Hana Bank Collateralized money invested KRW 13,923 Standard Chartered Korea Southern Power Co., Ltd. Pyeongchang Wind Power Co., Ltd. Collateralized money invested KRW 14,464 Woori Bank and Shinhan Bank and others Performance guarantees — Korea Southern Power Co., Ltd. Taebaek Guinemi Wind Power Co., Ltd. Collateralized money invested KRW 13,049 IBK Korea Southern Power Co., Ltd. Samcheok Eco Materials Co., Ltd. Payment guarantees(*2) — SEM Investment Co., Ltd. Primary guarantor Principal obligor Type of guarantees Credit limit Creditor In millions of won Korea Southern Power Co., Ltd. Solaseado Solar Power Co., Ltd. Collateralized money invested KRW 12,088 Kookmin Bank and others Korea Southern Power Co., Ltd. Naepo Green Energy Co., Ltd. Collateralized money invested(8) — IBK and others Guarantees for supplemental funding(*1) KRW 30,000 Guarantees for other supplemental funding and performance guarantees(*1) — Korea Southern Power Co., Ltd. Omisan Wind Power Co., Ltd. Collateralized money invested KRW 10,411 Shinhan Bank and others Guarantees for supplemental funding and performance guarantees(*1) — Korea Southern Power Co., Ltd. Geumsungsan Wind Power Co., Ltd. Collateralized money invested KRW 3,493 Kookmin Bank Guarantees for supplemental funding(*1) — KOSPO Chile SpA Kelar S.A. Collateralized money invested KRW 117,137 Export-Import Bank of Korea and others KOSPO Chile SpA Chester Solar I SpA Collateralized money invested KRW 1,314 IBK KOSPO Chile SpA Chester Solar IV SpA Collateralized money invested KRW 181 IBK KOSPO Chile SpA Chester Solar V SpA Collateralized money invested KRW 156 IBK KOSPO Chile SpA Diego de Almagro Solar SpA Collateralized money invested KRW 540 IBK KOSPO Chile SpA Laurel SpA Collateralized money invested KRW 554 IBK Korea Midland Power Co., Ltd. YeongGwang Yaksu Wind Electric Co., Ltd. Collateralized money invested KRW 156 IBK and others Korea Midland Power Co., Ltd. Hyundai Green Power Co., Ltd. Collateralized money invested KRW 119,791 Korea Development Bank and others Korea Midland Power Co., Ltd. PT. Cirebon Electric Power Debt guarantees USD 4,785 Mizuho Bank Korea Midland Power Co., Ltd. PT Wampu Electric Power Debt guarantees USD 4,401 SMBC Korea Midland Power Co., Ltd. Green Energy Electricity Generation Co., Ltd. Collateralized money invested KRW 1,571 IBK Guarantees for supplemental funding and others(*1) — IBK and others Korea Midland Power Co., Ltd. Yaksu ESS Co., Ltd. Collateralized money invested KRW 486 IBK Korea Midland Power Co., Ltd. Namjeongsusang Solar Power Operation Co., Ltd. Collateralized money invested KRW 373 IBK Korea Midland Power Co., Ltd. Gwangbaek Solar Power Investment Co., Ltd. Collateralized money invested KRW 5,133 Kyobo Life Insurance Co., Ltd. and others Korea Midland Power Co., Ltd. Muan Sunshine Solar Power Plant Co., Ltd. Collateralized money invested KRW 2,562 IBK Korea Midland Power Co., Ltd. Goesan Solar park Co., Ltd. Collateralized money invested KRW 2,591 IBK Korea Midland Power Co., Ltd. Bitgoel Eco Energy Co., Ltd. Collateralized money invested KRW 5,292 IBK and others Guarantees for supplemental funding(*1) — Korea Midland Power Co., Ltd. Energyco Co., Ltd. Collateralized money invested Debt guarantees KRW 2,190 KRW 2,746 Nonghyup Bank Shinhan Bank Korea Midland Power Co., Ltd. Jeju Gimnyeong Wind Power Co., Ltd. Collateralized money invested KRW 872 Nonghyup Bank Korea Midland Power Co., Ltd. Dongbu Highway Solar Co., Ltd. Collateralized money invested KRW 352 Nonghyup Bank Korea Midland Power Co., Ltd. Seobu Highway Solar Co., Ltd. Collateralized money invested KRW 316 Nonghyup Bank Korea Midland Power Co., Ltd. Yeongyang Wind Power Corporation II Collateralized money invested KRW 7,461 Korea Development Bank and Samsung Fire & Marine Insurance Co., Ltd. Korea Midland Power Co., Ltd. Haeparang Energy Co., Ltd. Collateralized money invested Guarantees for supplemental funding KRW 2,188 — Templeton hana asset management Co. Ltd Korea Midland Power Co., Ltd. Saemangeum Sebit Power Plant Co., Ltd. Guarantees for supplemental funding(*1) — Kookmin Bank Korea South-East Power Co., Ltd. Dayone Energy Co., Ltd. Collateralized money invested(*3) — IBK Guarantees for supplemental funding and others(*1,4) KRW 76,800 NH investment & securities Co., Ltd. and others Korea South-East Power Co., Ltd. RES Technology AD Collateralized money invested KRW 15,133 UniCredit Bulbank and others Korea South-East Power Co., Ltd. ASM-BG Investicii AD Collateralized money invested KRW 14,555 UniCredit Bulbank and others Korea South-East Power Co., Ltd. Expressway Solar-light Power Generation Co., Ltd. Guarantees for supplemental funding and others KRW 4,754 Woori Bank Korea South-East Power Co., Ltd. Goseong Green Power Co., Ltd. Collateralized money invested KRW 288,893 Kyobo Life Insurance Co., Ltd. and others Korea South-East Power Co., Ltd. Gangneung Eco Power Co., Ltd. Collateralized money invested — Kyobo Life Insurance Co., Ltd. and others Korea South-East Power Co., Ltd. PND Solar Co., Ltd. Collateralized money invested KRW 1,403 IBK Primary guarantor Principal obligor Type of guarantees Credit limit Creditor In millions of won Korea South-East Power Co., Ltd. Hyundai Eco Energy Co., Ltd. Collateralized money invested KRW 7,631 Samsung Life Insurance and others Korea South-East Power Co., Ltd. Jaeun Resident Wind Power Plant Co., Ltd. Collateralized money invested KRW 2,236 IBK Korea South-East Power Co., Ltd. Chungsongmeon BongSan wind power Co., Ltd. Collateralized money invested KRW 3,470 Kyobo Life Insurance Co., Ltd. and others Korea South-East Power Co., Ltd. Yeongam Solar Power Co., Ltd. Collateralized money invested KRW 9,879 Kookmin Bank and others Korea South-East Power Co., Ltd. Samsu Wind Power Co., Ltd. Collateralized money invested KRW 3,205 Shinhan Bank and others Korea South-East Power Co., Ltd. Saemangeum Heemang Photovoltaic Co., Ltd. Collateralized money invested KRW 13,010 Woori Bank and others Korea South-East Power Co., Ltd. Nepal Water & Energy Development Company Private Limited Collateralized money invested USD 97,105 International Finance Corporation and others Business reserve payment guarantee USD 33,333 Korea Hydro & Nuclear Power Co., Ltd. Noeul Green Energy Co., Ltd. Collateralized money invested — Hana Bank and others Korea Hydro & Nuclear Power Co., Ltd. Busan Green Energy Co., Ltd. Collateralized money invested KRW 4,396 Shinhan Bank and others Korea Hydro & Nuclear Power Co., Ltd. Go deok Clean Energy Co., Ltd. Collateralized money invested KRW 4,419 Kookmin Bank and others Korea Hydro & Nuclear Power Co., Ltd. Cheong-Song Noraesan Wind Power Co., Ltd. Collateralized money invested KRW 4,264 Woori Bank and others Korea Hydro & Nuclear Power Co., Ltd. Gwangyang Green Energy Co., Ltd. Collateralized money invested KRW 25,043 Shinhan Bank and others Korea Hydro & Nuclear Power Co., Ltd. Gangneung Sacheon Fuel Cell Co., Ltd. Collateralized money invested KRW 4,276 Hana Bank and others Korea Hydro & Nuclear Power Co., Ltd. Chun-cheon Green Energy Co., Ltd. Collateralized money invested KRW 9,156 Hana Bank and others (*1) The Company guarantees to provide supplemental funding for business with respect to excessive business expenses or insufficient repayment of borrowings. (*2) Controlling and non-controlling pre-emption (*3) The Company recognized an impairment loss on all of the equity securities of Dayone Energy Co., Ltd. before the prior year, and the acquisition cost of the securities provided as collateral is ￦47,067 million. (*4) Pursuant to the guarantee agreement, the Company recognized other provisions of ￦7,230 million as the possibility of economic benefit outflow to fulfill the obligation was deemed probable and the amount could be reasonably estimated. (*5) The common stocks of Dongducheon Dream Power Co., Ltd. held by the Company were pledged as collateral. (*6) The Company provided a payment guarantee to Daehan Wind Power PSC for opening L/C for Debt Service Reserve Account (DSRA). (*7) This includes a guarantee related to L/C for debt repayment allowance provided to DE Energia SpA, a joint venture of the Company. (*8) The Company recognized an impairment loss on all of the equity securities of Naepo Green Energy Co., Ltd. before the prior year, and the acquisition cost of the securities provided as collateral is ￦29,200 million. (*9) The credit limits of guarantees to RE Holiday Holdings LLC and RE Barren Ridge 1 Holdings LLC include the credit limits of guarantees to their subsidiaries. (*10) Saemangeum Sebit Power Plant Co., Ltd., the Company’s related party as of December 31, 2022, is raising a fund from kookmin bank and others amounting to KRW 99.9 billion (remaining balance as of December 31, 2022 is KRW 36.5 billion) through project financing commitment. The Company is going to provide the lender a guarantee up to KRW 63.4 billion in the commitment except for KRW 36.5 billion which is a senior loan, as shares of Saemangeum Sebit Power Plant Co., Ltd. owned by the Company at the time of fund-raising. (*11) The Company has provided the syndicate of lenders of PT Indo Raya Tenaga, the business corporation of PT Barito Wahana Tenaga, a guarantee by establishing the right of pledge on the shares of PT Barito Wahana Tenaga for project financing of PT Barito Wahana Tenaga as of December 31, 2022.
Summary of Derivatives Transactions With Related Parties	(9) Derivatives transactions with related parties as of December 31, 2022 are as follows: (i) Currency Swap Counterparty Contract Contract amounts Contract interest rate per annum Contract exchange rate Pay Receive Pay Receive In millions of won and thousands of foreign currencies except contract exchange rate information Korea Development Bank 2019~2024 ￦ 177,600 USD 150,000 1.24 % 2.50 % ￦ 1,184.00 2020~2025 241,320 USD 200,000 0.54 % 1.13 % 1,206.60 2021~2026 118,170 USD 100,000 1.11 % 1.13 % 1,181.70 2015~2025 111,190 USD 100,000 2.62 % 3.25 % 1,111.90 2017~2027 111,610 USD 100,000 2.31 % 3.13 % 1,116.10 2018~2028 108,600 HKD 800,000 2.69 % 3.35 % 135.75 2018~2023 170,280 USD 150,000 2.15 % 3.75 % 1,135.20 2019~2027 119,978 CHF 100,000 1.43 % 0.05 % 1,199.78 2021~2026 111,400 USD 100,000 0.93 % 1.25 % 1,114.00 2022~2027 262,000 USD 200,000 3.63 % 4.25 % 1,310.00 2020~2026 118,910 USD 100,000 0.61 % 1.00 % 1,189.10 2021~2026 114,230 USD 100,000 1.27 % 1.25 % 1,142.30 2022~2027 123,710 USD 100,000 3.41 % 3.63 % 1,237.10 2018~2023 320,880 USD 300,000 2.03 % 3.75 % 1,069.60 2022~2025 128,560 USD 100,000 3.37 % 4.13 % 1,285.60 2018~2023 169,335 USD 150,000 2.26 % 3.88 % 1,128.90 2020~2025 122,780 USD 100,000 0.93 % 1.75 % 1,227.80 2022~2025 252,360 USD 200,000 2.83 % 3.60 % 1,261.80 (ii) Currency forward Counterparty Contract date Maturity date Contract amounts Contract exchange rate Pay Receive In millions of won and thousands of USD except contract exchange rate information Korea Development Bank 2022.12.19 2023.01.26 ￦ 26,010 USD 20,000 ￦ 1,300.50
Summary of Salaries and Other Compensations To The Key Members of Management of The Company	(10) The Company considers all standing directors of the Board who serve as executive officers responsible for planning, operations and/or control of business activities, as key management personnel, except a standing director who is a member of the Audit Committee. The Company recorded salaries and other compensations related to the key management personnel as follows: Type 2020 2021 2022 In millions of won Salaries ￦ 1,295 1,272 1,026 Retirement benefits 58 21 58 ￦ 1,353 1,293 1,084
Summary of Guarantees Received from Related Parties	(8) Guarantees received from related parties as of December 31, 2022 are as follows Primary Guarantor Type of guarantees Credit limit KAPES, Inc. Performance guarantees ￦ 17,225 Defect guarantees 2,533

Statement of Cash Flows (Tables

Statement of Cash Flows (Tables)	12 Months Ended
	Dec. 31, 2022
Non Cash Transactions [Abstract]
Summary of Significant Non-cash Activities	(1) Significant non-cash Transactions 2020 2021 2022 In millions of won Transfer from construction-in-progress ￦ 10,189,527 12,902,589 13,723,972 Recognition of asset retirement cost and related provision for decommissioning costs 895,507 2,356,805 3,497,866 Transfer from provision for disposal of spent nuclear fuel to accrued expenses 395,921 455,401 417,687 Transfer from long-term borrowings and debt securities to current portion of long-term 9,237,883 11,109,271 13,838,578 Transfer from inventory to stored nuclear fuel 1,055,974 908,842 738,720 Transfer of right-of-use 291,334 78,213 197,016
Summary of Changes in Liabilities Incurred From Financing Activities	(2) Changes in liabilities incurred from financing activities for the years ended December 31, 2021, and 2022 are as follows: 2021 Non-cash Beginning Cash flows Increase Effect of fluctuations Ending In millions of won Borrowings and debt securities ￦ 69,724,581 9,653,394 — 1,151,538 80,529,513 Lease liabilities 4,621,096 (572,036 ) 73,090 288,353 4,410,503 ￦ 74,345,677 9,081,358 73,090 1,439,891 84,940,016 2022 Non-cash Beginning Cash flows Increase Effect of fluctuations Ending In millions of won Borrowings and debt securities ￦ 80,529,513 39,193,815 — 882,037 120,605,365 Lease liabilities 4,410,503 (562,647 ) 109,019 206,268 4,163,143 ￦ 84,940,016 38,631,168 109,019 1,088,305 124,768,508

Commitments for Expenditure (Ta

Commitments for Expenditure (Tables)	12 Months Ended
	Dec. 31, 2022
Commitments for Expenditure [Abstract]
Summary of Commitments For Acquisition of Property, Plant and Equipment	(1) The commitments related to acquisition of property, plant and equipment as of December 31, 2021 and 2022 are as follows: 2021 2022 Contracts Commitment Remaining liability balances Commitment Remaining In millions of won Purchase of cable (PVC, 1C, 2000SQ) 153,000M and others (Shin-Bupyung-Youngseo) ￦ 57,046 16,240 57,203 12,595 Purchase of cable (PVC, 1C, 2500SQ) 103,374M and others (Bukdangjin-Shin-Tangjung) 46,616 34,102 50,151 37,638 Purchase of GIS (362kV, 6300A, 63kA) 23CB – Youngseo S/S 36,143 25,292 37,168 16,788 Purchase of GIS (362kV, 6300A, 63kA) 26CB – Hwasung S/S 40,010 5,540 — — Purchase of GIS (362kV, 6300A, 63kA) 27CB – Kwangyang S/S 37,744 140 37,744 140 Purchase of cable (PVC, 1C, 2500SQ) 100,548M and others 56,860 34,576 58,269 3,883 Purchase of GIS (362kV, 6300A, 63kA) 25CB – Migeum S/S 32,000 26,700 33,841 25,641 Advanced E-Type low-pressure electronic power meter 1,320,000 ea 65,972 23,262 — — Purchase of cable (PVC, 1C, 2000SQ) 5,862M and others (Baekun-Gwangyanghang) 34,423 23,297 35,949 3,232 Purchase of cable (TR CNCE-W,1C,325SQ) 1,016,000M 66,581 40,254 — — Purchase of cable (TR CNCE-W,1C,600SQ) 485,000M 46,194 37,810 — — Purchase of cable (TR CNCE-W/AL,1C,400SQ) 3,303,900M 87,382 83,628 — — Concrete pole (10M, general purpose, 350KGF) 126,948 ea and five other equipments 188,338 168,456 202,795 95,428 Purchase of GIS (362KV, 6300A, 63KA) 19 – Shinyangsan S/S 31,464 31,464 31,834 17,334 Purchase of cable (PVC, 1C, 2500SQ) 57,868M and others (Goduk-Seoansung) — — 40,937 3,748 Purchase of cable (PVC, 1C, 2000SQ) 87,732M and others (Eulwangboonki) — — 36,155 10,274 GIS(362KV,6300A,63KA) 18 – Wolsung S/Y — — 32,090 32,090 Purchase of cable (FR CNCO-W,1C,325SQ) 672,300M — — 31,387 19,213 Purchase of cable (TR CNCE-W,1C,325SQ) 1,342,000M — — 75,620 40,497 Purchase of cable (TR CNCE-W,1C,600SQ) 377,000M — — 31,851 17,478 Purchase of cable (TR CNCE-W/AL,1C,400SQ) 2,175,300M — — 53,064 29,436 System stabilization ESS equipment (Bubuk S/S) 1 Type — — 222,300 222,300 System stabilization ESS equipment (Shinnamwon S/S) Type 1 — — 211,500 211,500 System stabilization ESS equipment (Yeongcheon S/S) Type 1 — — 73,104 73,104 Construction of Saeul Units (#3,4) 9,800,424 3,479,667 9,800,424 2,455,673 Construction of Shin-Hanul Units (#1,2) 9,745,123 — 10,327,372 97,889 Other 36 contracts 792,485 620,593 853,941 425,149 Service of designing Seoul Combined Units (#1,2) 31,841 934 31,148 — Purchase of furnace for construction of Shin-Seocheon thermal power plant 305,209 7,722 305,209 5,132 Purchase of turbine generator for construction of Shin-Seocheon thermal power plant 105,226 6,301 107,333 6,214 Purchase of main machine for Jeju LNG combined 166,287 10,972 166,287 10,898 Purchase of equipments for the construction project of Boryeong indoor coal storage yard 317,350 317,350 318,197 287,965 Service of designing Taean Units (#9,10) 112,909 12,623 112,909 12,468 Purchase of gas turbine and turbine equipment of Gimpo combined heat & power plant 126,302 61,735 126,302 32,748 Purchase of steam turbine, HRSG and POWER BLOCK of Gimpo combined heat & power plant 214,053 138,244 221,997 38,714 Construction of Gimpo combined heat & power plant 130,015 86,323 181,798 56,558 Purchase of gas turbines, steam turbines, and accessories for Gumi natural gas power plant — — 197,983 197,983 Construction of Gumi natural gas power plant — — 204,094 204,094 Installation of natural gas supply facility at Gumi natural gas power plant — — 70,620 70,620 Purchase of coal handling machine for construction of Samcheok Units (#1,2) 286,571 6,215 299,048 6,687 2021 2022 Contracts Commitment Remaining liability balances Commitment Remaining In millions of won Purchase of main equipment for Namjeju 140,144 3 140,144 3 Purchase of main equipment for Shin-Sejong combined thermal power plant ￦ 234,392 200,122 234,392 32,472 Purchase of Hadong thermal power indoor carboniferous plant 148,800 129,042 162,814 105,504 Purchase of phase 1 power generation facility for Yeongwol fuel cells 88,449 1,523 — — Purchase of phase 2 power generation facility for Yeongwol fuel cells — — 86,100 30,527 Purchase of fuel cell power generation facilities for the fifth stage of Shinincheon headquarters — — 81,960 81,960
Summary of Commitments For Inventory Purchase	Contract periods for ore concentrates, conversion, enrichment and design and fabrication are as follows: Type Periods Contracted Concentrate 2022 ~ 2033 26,310 Ton U3O8 Transformed 2022 ~ 2030 19,012 Ton U Enrichment 2022 ~ 2032 21,434 Ton SWU

Contingencies and Commitments (

Contingencies and Commitments (Tables)	12 Months Ended
	Dec. 31, 2022
Contingencies and Commitments [Abstract]
Summary of Ongoing Litigations Related With Contingent Liabilities And Contingent Assets	(1) Ongoing litigations and claims related with contingent liabilities and contingent assets as of December 31, 2021 and 2022 are as follows: 2021 2022 Number Claim Number Claim In millions of won As the defendant 683 ￦ 689,415 653 ￦ 981,878 As the plaintiff 284 784,453 238 599,809
Summary of Credit Lines Provided By Financial Institutions	(3) Lines of credit provided by financial institutions as of December 31, 2022 are as follows: Commitments Financial institutions Currency Credit Used amount In millions of won and thousands of foreign currencies Commitments on Bank-overdraft Nonghyup Bank and others KRW 1,910,500 53,416 Limit amount available for CP Hana Bank and others KRW 3,250,000 3,250,000 General Loan, etc. Hana Bank and others KRW 3,000,000 3,000,000 Limit amount available for card Hana Bank and others Banco de Oro KRW PHP 47,424 5,000 2,615 3,000 Loan limit Korea Development Bank and others DBS Bank Ltd and others KRW USD 2,023,728 1,385,000 1,369,694 143,841 Certification of payment on payables from foreign country Nonghyup Bank USD 12,028 8,040 Certification of payment on L/C Credit Agricole and others USD 1,317,245 402,677 Kookmin Bank and others EUR 48,122 31,472 Shinhan Bank JPY 481,785 — Certification of Performance guarantee on contract s Hana Bank and others KRW 127,606 106,020 First Abu Dhabi Bank and others USD 1,092,590 788,404 Korea Development Bank and others JPY 620,000 620,000 Hana Bank and others EUR 3,965 3,965 Shinhan Bank INR 44,872 — Hana Bank SAR 1,509 1,509 Certification of bidding Hana Bank USD 5,200 — Export-Import Bank of Korea EUR 10,000 10,000 Advance payment bond, Warranty bond, Retention bond and others Export-Import Bank of Korea KRW 106,776 75,900 Hana Bank and others USD 306,251 282,224 Hana Bank and others MXN 21,597 20,027 Others Nonghyup Bank and others KRW 1,216,250 300,936 Export-Import Bank of Korea and others USD 733,318 510,094 Standard Chartered AED 50 50 Shinhan Bank SAR 3,000 3,000 Inclusive credit Hana Bank KRW 8,000 667 Kookmin Bank USD 135,000 45,909 Hana Bank INR — 323,837 Equity Bridge Loan Guarantee Mizuho Bank and others USD 1,685,955 1,141,788 Trade finance Export-Import Bank of Korea and others USD 970,000 —
Summary of Blank Check And Assets Provided As Collaterals Or Pledges To Financial Institutions By The Company Explanatory	(4) As of December 31, 2022, blank check and assets provided as collaterals or pledges to financial institutions by the Company are follows: Obligor Creditor Assets provided as security Currency Amount Description In millions of won and thousands of foreign currencies Mira Power Limited International Finance Property, plant and equipment and others USD 275,600 Collateral for borrowings(*1) Tamra Offshore Wind Power Co., Ltd. Kyobo Life Insurance Co., Ltd. and others Property, plant and equipment and others KRW 171,600 Collateral for borrowings(*2) Gyeonggi Green Energy Co., Ltd. Korea Development Bank and others Cash and cash equivalents and others KRW 327,080 Collateral for borrowings(*2) Commerce and Industry Energy Co., Ltd. IBK and others Property, plant and equipment and others KRW 110,500 Collateral for borrowings(*2) KOSPO Youngnam Power Co., Ltd. Shinhan Bank and others Cash and cash equivalents and others KRW 744,120 Collateral for borrowings(*2) Gyeongju Wind Power Co., Ltd. Shinhan Bank and others Property, plant and equipment and others KRW 68,400 Collateral for borrowings(*2) Korea Offshore Wind Power Co., Ltd. Woori Bank and others Property, plant and equipment and others KRW 293,400 Collateral for borrowings(*2) Qatrana Electric Power Company The Islamic Development Bank and others Finance lease receivable and property, plant and equipment and others JOD 136,623 Collateral for borrowings(*1) KST Electric Power Company, S.A.P.I. de C.V. The Export—Import Bank of Korea and others Finance lease receivable and property, plant and equipment and others USD 401,277 Collateral for Incheon Fuel Cell Co., Ltd. Kookmin Bank and others Cash and cash equivalents and others KRW 276,960 Collateral for borrowings(*2) K-Solar Shinan Co., Ltd. (formerly, TS Energy No. 25 Co., Ltd.) Kyobo Life Insurance Co., Ltd. and others Property, plant and equipment and others KRW 329,736 Collateral for borrowings(*2) Jeongam Wind Power Co., Ltd. KDB Capital Corporation and others Cash and cash equivalents and others KRW 235,809 Collateral for borrowings(*2) (*1) This is based on the amount of loan commitment limit. (*2) As of December 31, 2022, the Company has established guarantees for pledge for transfer of rights of long-term borrowings, pledge for insurance claims, pledge for shares, etc.

Subsequent Events (Tables)

Subsequent Events (Tables)	12 Months Ended
	Dec. 31, 2022
Disclosure of non-adjusting events after reporting period [abstract]
Summary of Subsequent Events	(1) Subsequent to December 31, 2022, KEPCO and its subsidiaries including Korea Hydro & Nuclear Power Co., Ltd., Korea South-East Power Co., Ltd., Korea Western Power Co., Ltd., and Korea Southern Power Co., Ltd. issued corporate bonds for the purposes of operation and others as follows: Company Type Issue date Maturity Interest rate (%) Amount In millions of won and thousands of foreign currencies Korea Electric Power Corporation #1339 Corporate bond 2023.01.03 2025.01.03 4.40 ￦ 200,000 #1340 Corporate bond 2023.01.03 2026.01.03 4.50 320,000 #1341 Corporate bond 2023.01.05 2025.01.05 4.20 140,000 #1342 Corporate bond 2023.01.05 2026.01.05 4.30 240,000 #1343 Corporate bond 2023.01.09 2025.01.09 4.20 130,000 #1344 Corporate bond 2023.01.09 2026.01.09 4.28 280,000 #1345 Corporate bond 2023.01.12 2025.01.12 4.00 110,000 #1346 Corporate bond 2023.01.12 2026.01.12 4.08 330,000 #1347 Corporate bond 2023.01.16 2025.01.16 4.00 190,000 #1348 Corporate bond 2023.01.16 2026.01.16 4.05 220,000 #1349 Corporate bond 2023.01.19 2025.01.19 3.85 180,000 #1350 Corporate bond 2023.01.19 2026.01.19 3.87 320,000 #1351 Corporate bond 2023.01.25 2025.01.25 3.85 140,000 #1352 Corporate bond 2023.01.25 2026.01.25 3.89 410,000 #1353 Corporate bond 2023.02.03 2025.02.03 3.50 220,000 #1354 Corporate bond 2023.02.03 2026.02.03 3.54 280,000 #1355 Corporate bond 2023.02.06 2025.02.06 3.65 210,000 #1356 Corporate bond 2023.02.06 2026.02.06 3.65 320,000 #1357 Corporate bond 2023.02.10 2025.02.10 3.80 100,000 #1358 Corporate bond 2023.02.10 2026.02.10 3.83 340,000 #1359 Corporate bond 2023.02.13 2025.02.13 3.83 180,000 #1360 Corporate bond 2023.02.13 2026.02.13 3.85 320,000 #1361 Corporate bond 2023.02.17 2025.02.17 3.99 110,000 #1362 Corporate bond 2023.02.17 2026.02.17 4.10 320,000 #1363 Corporate bond 2023.02.20 2025.02.20 4.09 150,000 #1364 Corporate bond 2023.02.20 2026.02.20 4.11 160,000 #1365 Corporate bond 2023.03.03 2025.03.03 4.35 100,000 #1366 Corporate bond 2023.03.03 2026.03.03 4.40 110,000 #1367 Corporate bond 2023.03.06 2025.03.06 4.25 180,000 #1368 Corporate bond 2023.03.06 2026.03.06 4.35 210,000 #1369 Corporate bond 2023.03.10 2025.03.10 4.25 230,000 #1370 Corporate bond 2023.03.10 2026.03.10 4.35 230,000 #1371 Corporate bond 2023.03.13 2025.03.13 4.14 140,000 #1372 Corporate bond 2023.03.13 2026.03.13 4.25 260,000 #1373 Corporate bond 2023.03.22 2025.03.22 3.97 160,000 #1374 Corporate bond 2023.03.22 2026.03.22 4.00 70,000 #1375 Corporate bond 2023.03.30 2025.03.30 3.98 240,000 #1376 Corporate bond 2023.03.30 2026.03.30 3.99 160,000 #1377 Corporate bond 2023.04.04 2025.04.04 3.99 270,000 #1378 Corporate bond 2023.04.04 2026.04.04 4.00 260,000 #1379 Corporate bond 2023.04.07 2025.04.07 3.95 210,000 #1380 Corporate bond 2023.04.07 2026.04.07 3.95 190,000 #1381 Corporate bond 2023.04.12 2025.04.12 3.91 240,000 #1382 Corporate bond 2023.04.12 2026.04.12 3.95 170,000 #1383 Corporate bond 2023.04.21 2025.04.21 3.89 200,000 Company Type Issue date Maturity Interest rate (%) Amount In millions of won and thousands of foreign currencies Korea Hydro & Nuclear Power Co., Ltd. #70-1 Corporate bond 2023.02.22 2028.02.22 4.10 90,000 #70-2 Corporate bond 2023.02.22 2033.02.22 4.15 40,000 #70-3 Corporate bond 2023.02.22 2043.02.22 4.08 20,000 #71-1 Corporate bond 2023.03.07 2028.03.07 4.13 50,000 #71-2 Corporate bond 2023.03.07 2033.03.07 4.18 30,000 #72-1 Corporate bond 2023.04.26 2028.04.26 3.91 130,000 #72-2 Corporate bond 2023.04.26 2043.04.26 4.00 90,000 Korea South-East Power Co., Ltd. #57-1 Corporate bond 2023.02.09 2024.02.08 3.56 120,000 #57-2 Corporate bond 2023.02.09 2026.02.09 3.74 50,000 Korea Western Power Co., Ltd. #57-1 Corporate bond 2023.01.17 2025.01.17 4.07 70,000 #57-2 Corporate bond 2023.01.17 2026.01.17 4.04 30,000 #58-1 Corporate bond 2023.04.20 2026.04.20 3.98 200,000 #58-2 Corporate bond 2023.04.20 2028.04.20 4.13 40,000 #58-3 Corporate bond 2023.04.20 2043.04.20 3.94 20,000 Korea Southern Power Co., Ltd. #67-1 Corporate bond 2023.01.12 2024.01.12 3.97 100,000 #67-2 Corporate bond 2023.01.12 2025.01.10 4.04 40,000 #68-1 Corporate bond 2023.04.13 2024.04.12 3.63 150,000 #68-2 Corporate bond 2023.04.13 2026.04.13 3.76 50,000 (2) On February 14th, 2023, the subsidiary, Korea South-East Power Co., Ltd. invested in Bidiai Co., Ltd., and as a result of the approval of Bidiai’s restructuring plan, on February 17th, 2023, ￦ billion of bonds were converted into shares, making Korea South-East Power Co., Ltd. the largest shareholder of Bidiai Co., Ltd. with a stake of (3) On January 8th, 2023, a fire broke out in Taean IGCC Gas Refining Plant of the subsidiary, Korea Western Power Co., Ltd., resulting in the suspension of production. The amount of damages caused by the fire is under investigation, and the Company is currently verifying the insurance coverage with the property insurance policy.

Reporting Entity (Description_3

Reporting Entity (Description of the controlling company) - Additional Information (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Statement [Line Items]
Name of reporting entity or other means of identification	Korea Electric Power Corporation and subsidiaries
Name of parent entity	Korea Electric Power Corporation
Entity Incorporation, Date of Incorporation	Incorporated on December 31, 1981 in accordance with the Korea Electric Power Corporation Act (the “KEPCO Act”)
Description of nature of entity's operations and principal activities	Engage in the generation, transmission and distribution of electricity and development of electric power resources. KEPCO also provides power plant construction service
Country of incorporation	Republic of Korea
Information of listing on stock market	KEPCO’s stock was first listed on the Korea Stock Exchange on August 10, 1989 and subsequently on the New York Stock Exchange on October 27, 1994 through its depository receipts.
Address of registered office of entity	KEPCO’s headquarters is located in Naju-si, Jeollanam-do.
Issued capital	₩ 3,209,820	₩ 3,209,820

Reporting Entity (Description_4

Reporting Entity (Description of the Controlling Company) - Summary of the Company's Shareholders (Details) - shares	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of shareholders information [Line Items]
Number of shares	641,964,077	641,964,077	641,964,077
Percentage of ownership	100%
The Government of the Republic of Korea
Disclosure of shareholders information [Line Items]
Number of shares	116,841,794
Percentage of ownership	18.20%
Korea Development Bank (KDB)
Disclosure of shareholders information [Line Items]
Number of shares	211,235,264
Percentage of ownership	32.90%
Foreign investors
Disclosure of shareholders information [Line Items]
Number of shares	88,959,339
Percentage of ownership	13.86%
Other
Disclosure of shareholders information [Line Items]
Number of shares	224,927,680
Percentage of ownership	35.04%

Basis of Preparation - Summary

Basis of Preparation - Summary of Change in Accounting Policy (Details) ₩ / shares in Units, ₩ in Millions	12 Months Ended
	Dec. 31, 2022 KRW (₩) ₩ / shares	Dec. 31, 2021 KRW (₩) ₩ / shares	Dec. 31, 2020 KRW (₩) ₩ / shares	Dec. 31, 2020 KRW (₩) $ / shares	Jan. 01, 2021 KRW (₩)	Dec. 31, 2019 KRW (₩)
Disclosure of voluntary change in accounting policy [line items]
Current assets	₩ 29,750,545	₩ 22,050,845
Non-current assets	205,054,449	189,072,882
Total Assets (Notes 2 and 4)	234,804,994	211,123,727
Current liabilities	44,518,577	31,732,220
Non-current liabilities	148,286,161	114,064,801
Total liabilities (Note 4)	192,804,738	145,797,021
Contributed capital	4,053,578	4,053,578
Retained earnings	21,431,300	45,258,244
Other components of equity	15,060,518	14,468,450
Non-controlling interests	1,454,860	1,546,434
Total Equity (Note 2)	42,000,256	65,326,706	₩ 70,668,059	₩ 70,668,059		₩ 68,889,649
Total Liabilities and Equity	234,804,994	211,123,727
Sales	70,546,024	60,012,375	57,926,634
Cost of sales	(100,903,594)	(63,644,290)	(51,804,179)
Gross profit (loss)	(30,357,570)	(3,631,915)	6,122,455
Selling and administrative expenses	(3,009,422)	(2,875,796)	(2,678,443)
Operating profit (loss) (Note 4)	(32,240,531)	(5,722,991)	4,097,834
Other non-operating income	1,095,489	1,034,133	1,036,448
Other non-operating expense	(212,150)	(257,932)	(417,720)
Other gains, net	243,122	8,519	35,094
Finance income	1,833,312	1,402,614	1,510,249
Finance expenses (Notes 5,12 and 40)	(4,746,791)	(3,245,777)	(2,896,443)
Profit related to associates, joint ventures and subsidiaries	1,310,391	494,584	281,107
Profit (loss) before income tax	(33,843,619)	(7,071,570)	2,992,747
Income tax benefit	9,414,511	1,855,989	(899,064)
Profit (loss) for the year	(24,429,108)	(5,215,581)	2,093,683
Loss attributable to owners of the controlling company	(24,466,853)	(5,304,522)	1,992,077
Profit attributable to non-controlling interests	37,745	88,941	101,606
Other comprehensive income (loss)	1,246,869	599,614	(219,841)
Total comprehensive income (loss) for the year	(23,182,239)	(4,615,967)	1,873,842
Total comprehensive loss attributable to owners of the controlling company	(23,273,171)	(4,743,513)	1,803,554
Total comprehensive income (attributable to non-controlling interests	₩ 90,932	₩ 127,546	₩ 70,288
Loss per share (in won), Basic | ₩ / shares	₩ (38,112)	₩ (8,263)	₩ 3,102
Loss per share (in won), Diluted | ₩ / shares	₩ (38,112)	₩ (8,263)	₩ 3,102
Cash flows from operating activities	₩ (23,477,500)	₩ 4,491,378	₩ 13,208,474
Cash flows from investing activities	(14,953,753)	(12,372,520)	(14,831,812)
Cash flows from financing activities	₩ 38,997,899	8,435,077	1,880,824
Previously stated
Disclosure of voluntary change in accounting policy [line items]
Current assets		22,050,845			₩ 20,561,941
Non-current assets		189,058,025			182,580,170
Total Assets (Notes 2 and 4)		211,108,870			203,142,111
Current liabilities		31,732,220			25,881,222
Non-current liabilities		114,064,801			106,594,043
Total liabilities (Note 4)		145,797,021			132,475,265
Contributed capital		4,053,578			4,053,578
Retained earnings		45,246,982			51,133,601
Other components of equity		14,468,450			14,109,501
Non-controlling interests		1,542,839			1,370,166
Total Equity (Note 2)		65,311,849			70,666,846
Total Liabilities and Equity		211,108,870			203,142,111
Sales		60,574,819	57,925,837
Cost of sales		(63,559,178)	(51,804,596)
Gross profit (loss)		(2,984,359)	6,121,241
Selling and administrative expenses		(2,875,784)	(2,678,443)
Operating profit (loss) (Note 4)		(5,860,143)	3,442,798
Other non-operating income		372,921	1,036,448
Other non-operating expense		(257,932)	(417,720)
Other gains, net		8,519	35,094
Finance income		1,402,614	1,510,249
Finance expenses (Notes 5,12 and 40)		(3,245,777)	(2,896,443)
Profit related to associates, joint ventures and subsidiaries		494,584	281,107
Profit (loss) before income tax		(7,085,214)	2,991,533
Income tax benefit		1,855,989	(899,064)
Profit (loss) for the year		(5,229,225)	2,092,469
Loss attributable to owners of the controlling company		(5,315,055)	1,991,347
Profit attributable to non-controlling interests		85,830	101,122
Other comprehensive income (loss)		599,614	(219,841)
Total comprehensive income (loss) for the year		(4,629,611)	1,872,628
Total comprehensive loss attributable to owners of the controlling company		(4,754,046)	1,802,824
Total comprehensive income (attributable to non-controlling interests		₩ 124,435	69,804
Loss per share (in won), Basic | (per share)		₩ (8,279)		₩ 3,102
Loss per share (in won), Diluted | (per share)		₩ (8,279)		3,102
Cash flows from operating activities		₩ 4,473,186	13,208,473
Cash flows from investing activities		(12,354,328)	(14,831,811)
Cash flows from financing activities		8,435,077	1,880,824
Adjustment
Disclosure of voluntary change in accounting policy [line items]
Current assets		0			0
Non-current assets		14,857			1,214
Total Assets (Notes 2 and 4)		14,857			1,214
Current liabilities		0			0
Non-current liabilities		0			0
Total liabilities (Note 4)		0			0
Contributed capital		0			0
Retained earnings		11,262			730
Other components of equity		0			0
Non-controlling interests		3,595			484
Total Equity (Note 2)		14,857			1,214
Total Liabilities and Equity		14,857			1,214
Sales		98,768	797
Cost of sales		(85,112)	417
Gross profit (loss)		13,656	1,214
Selling and administrative expenses		(12)	0
Operating profit (loss) (Note 4)		13,644	1,214
Other non-operating income		0	0
Other non-operating expense		0	0
Other gains, net		0	0
Finance income		0	0
Finance expenses (Notes 5,12 and 40)		0	0
Profit related to associates, joint ventures and subsidiaries		0	0
Profit (loss) before income tax		13,644	1,214
Income tax benefit		0	0
Profit (loss) for the year		13,644	1,214
Loss attributable to owners of the controlling company		10,533	730
Profit attributable to non-controlling interests		3,111	484
Other comprehensive income (loss)		0	0
Total comprehensive income (loss) for the year		13,644	1,214
Total comprehensive loss attributable to owners of the controlling company		10,533	730
Total comprehensive income (attributable to non-controlling interests		₩ 3,111	484
Loss per share (in won), Basic | (per share)		₩ 16		0
Loss per share (in won), Diluted | (per share)		₩ 16		0
Cash flows from operating activities		₩ 18,192	1
Cash flows from investing activities		(18,192)	(1)
Cash flows from financing activities		0	0
Currently stated
Disclosure of voluntary change in accounting policy [line items]
Current assets		22,050,845			20,561,941
Non-current assets		189,072,882			182,581,384
Total Assets (Notes 2 and 4)		211,123,727			203,143,325
Current liabilities		31,732,220			25,881,222
Non-current liabilities		114,064,801			106,594,043
Total liabilities (Note 4)		145,797,021			132,475,265
Contributed capital		4,053,578			4,053,578
Retained earnings		45,258,244			51,134,331
Other components of equity		14,468,450			14,109,501
Non-controlling interests		1,546,434			1,370,650
Total Equity (Note 2)		65,326,706			70,668,060
Total Liabilities and Equity		211,123,727			₩ 203,143,325
Sales		60,673,587	57,926,634
Cost of sales		(63,644,290)	(51,804,179)
Gross profit (loss)		(2,970,703)	6,122,455
Selling and administrative expenses		(2,875,796)	(2,678,443)
Operating profit (loss) (Note 4)		(5,846,499)	3,444,012
Other non-operating income		372,921	1,036,448
Other non-operating expense		(257,932)	(417,720)
Other gains, net		8,519	35,094
Finance income		1,402,614	1,510,249
Finance expenses (Notes 5,12 and 40)		(3,245,777)	(2,896,443)
Profit related to associates, joint ventures and subsidiaries		494,584	281,107
Profit (loss) before income tax		(7,071,570)	2,992,747
Income tax benefit		1,855,989	(899,064)
Profit (loss) for the year		(5,215,581)	2,093,683
Loss attributable to owners of the controlling company		(5,304,522)	1,992,077
Profit attributable to non-controlling interests		88,941	101,606
Other comprehensive income (loss)		599,614	(219,841)
Total comprehensive income (loss) for the year		(4,615,967)	1,873,842
Total comprehensive loss attributable to owners of the controlling company		(4,743,513)	1,803,554
Total comprehensive income (attributable to non-controlling interests		₩ 127,546	70,288
Loss per share (in won), Basic | (per share)		₩ (8,263)		3,102
Loss per share (in won), Diluted | (per share)		₩ (8,263)		₩ 3,102
Cash flows from operating activities		₩ 4,491,378	13,208,474
Cash flows from investing activities		(12,372,520)	(14,831,812)
Cash flows from financing activities		₩ 8,435,077	₩ 1,880,824

Basis of Preparation - Addition

Basis of Preparation - Additional Information (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Unbilled Revenue [Member]
Disclosure Of Basis Of Preparation Of Financial Statements [Line Items]
Unbilled revenue recognized	₩ 1,725,444	₩ 2,348,813

Significant Accounting Polici_4

Significant Accounting Policies - Summary of Property, Plant and Equipment, Estimated Useful Lives (Details)	12 Months Ended
	Dec. 31, 2022
Buildings
Disclosure of useful life of property plant and equipment [Line Items]
Useful lives (years)	8 ~ 40
Structures
Disclosure of useful life of property plant and equipment [Line Items]
Useful lives (years)	5 ~ 50
Machinery
Disclosure of useful life of property plant and equipment [Line Items]
Useful lives (years)	2 ~ 32
Vehicles
Disclosure of useful life of property plant and equipment [Line Items]
Useful lives (years)	3 ~ 8
Loaded heavy water
Disclosure of useful life of property plant and equipment [Line Items]
Useful lives (years)	30
Asset retirement costs
Disclosure of useful life of property plant and equipment [Line Items]
Useful lives (years)	18, 30, 40, 60
Right-of-use assets
Disclosure of useful life of property plant and equipment [Line Items]
Useful lives (years)	1 ~ 65
Ships
Disclosure of useful life of property plant and equipment [Line Items]
Useful lives (years)	9
Others
Disclosure of useful life of property plant and equipment [Line Items]
Useful lives (years)	4 ~ 15

Significant Accounting Polici_5

Significant Accounting Policies - Summary of Intangible Assets, Estimated Useful Lives (Details)	12 Months Ended
	Dec. 31, 2022
Usage rights for donated assets
Disclosure of intangible assets with indefinite useful life [Line Items]
Useful lives (years)	10 ~ 30
Amortization methods	Straight line
Software
Disclosure of intangible assets with indefinite useful life [Line Items]
Useful lives (years)	4, 5
Amortization methods	Straight line
Industrial rights
Disclosure of intangible assets with indefinite useful life [Line Items]
Useful lives (years)	5 ~ 10
Amortization methods	Straight line
Development expenditures
Disclosure of intangible assets with indefinite useful life [Line Items]
Useful lives (years)	5
Amortization methods	Straight line
Leasehold rights
Disclosure of intangible assets with indefinite useful life [Line Items]
Useful lives (years)	8 ~ 10
Amortization methods	Straight line
Other intangible assets
Disclosure of intangible assets with indefinite useful life [Line Items]
Useful lives (years)	3 ~ 50 or indefinite
Amortization methods	Straight line
Mining rights
Disclosure of intangible assets with indefinite useful life [Line Items]
Useful lives (years)	0
Amortization methods	Unit of production

Significant Accounting Polici_6

Significant Accounting Policies - Summary of Classification and Measurement of Financial Assets (Details)	12 Months Ended
	Dec. 31, 2022
To collect contractual cash flows | Solely payments of principal and interest
Summary Of Classification And Measurement Of Financial Assets [Line Items]
Financial instruments, classified under IFRS 9	Amortized cost
Both collecting contractual cash flows and selling financial assets | Solely payments of principal and interest
Summary Of Classification And Measurement Of Financial Assets [Line Items]
Financial instruments, classified under IFRS 9	FVOCI	[1]
Both collecting contractual cash flows and selling financial assets | Other than SPPI
Summary Of Classification And Measurement Of Financial Assets [Line Items]
Financial instruments, classified under IFRS 9	FVTPL	[2]
To sell financial assets | Solely payments of principal and interest
Summary Of Classification And Measurement Of Financial Assets [Line Items]
Financial instruments, classified under IFRS 9	FVTPL
[1]To eliminate or reduce an accounting mismatch, the Company may elect to recognize the amount of change in fair value in profit or loss.[2]On initial recognition of an equity investment that is not held for trading, the Company may irrevocably elect to present subsequent changes in the investment’s fair value in OCI.

Significant Accounting Polici_7

Significant Accounting Policies - Additional Information (Details) - Investment properties [Member]	12 Months Ended
	Dec. 31, 2022
Bottom of range [member]
Significant Accounting Policies [Line Items]
Investment property useful life (in years)	8
Top of range [member]
Significant Accounting Policies [Line Items]
Investment property useful life (in years)	40

Segment, Geographic and Other_3

Segment, Geographic and Other Information - Additional Information (Details)	12 Months Ended
	Dec. 31, 2022
Disclosure of operating segments [line items]
Information about major customers	There is no single customer which accounts for 10% or more of the Company’s revenue for the years ended December 31, 2020, 2021 and 2022.

Segment, Geographic and Other_4

Segment, Geographic and Other Information - Summary of Operating Segments (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of operating segments [line items]
Total segment revenue	₩ 70,546,024	₩ 60,012,375	₩ 57,926,634
Intersegment revenue	0	0	0
Revenue from external customers	70,546,024	60,012,375	57,926,634
Depreciation and amortisation	12,461,412	11,942,492	11,548,019
Interest income	340,753	221,874	242,586
Interest expense	2,818,546	1,914,457	1,995,425
Employee benefit expense	485,700	511,942	492,288
Loss on abandonment of property, plant and equipment	160,909	207,934	255,346
Increase in provisions, net	2,146,979	2,466,452	1,832,765
Operating profit (loss)	(32,240,531)	(5,722,991)	4,097,834
Finance income	1,833,312	1,402,614	1,510,249
Finance expense	(4,746,791)	(3,245,777)	(2,896,443)
Profit (loss) related to associates and joint ventures	1,310,391	494,584	281,107
Profit (loss) before income tax	(33,843,619)	(7,071,570)	2,992,747
Segment assets	234,804,994	211,123,727
Investments in associates and joint ventures	8,992,048	7,471,384
Acquisition of non-current assets	12,612,993	12,799,826
Segment liabilities	192,804,738	145,797,021
Operating segments
Disclosure of operating segments [line items]
Profit (loss) related to associates and joint ventures	1,310,391	494,584	281,107
Segment assets	286,568,529	252,060,510
Investments in associates and joint ventures	8,992,048	7,471,384
Acquisition of non-current assets	12,651,626	12,811,827
Segment liabilities	199,305,065	148,745,359
Operating segments | Transmission and distribution
Disclosure of operating segments [line items]
Total segment revenue	68,239,707	58,999,388	57,345,933
Intersegment revenue	1,922,354	1,672,776	1,224,602
Revenue from external customers	66,317,353	57,326,612	56,121,331
Depreciation and amortisation	4,130,004	3,990,464	3,836,355
Interest income	67,076	36,831	48,220
Interest expense	1,420,802	678,986	737,973
Employee benefit expense	180,114	193,412	190,302
Loss on abandonment of property, plant and equipment	157,784	202,262	236,727
Increase in provisions, net	611,534	1,194,643	731,194
Operating profit (loss)	(33,623,874)	(7,244,319)	3,045,912
Profit (loss) related to associates and joint ventures	980,146	391,116	169,176
Segment assets	131,023,727	115,578,517
Investments in associates and joint ventures	5,678,141	4,700,863
Acquisition of non-current assets	6,055,179	6,754,298
Segment liabilities	108,963,058	68,531,927
Operating segments | Electric power generation (Nuclear)
Disclosure of operating segments [line items]
Total segment revenue	10,386,091	9,324,391	9,938,941
Intersegment revenue	10,254,271	9,207,516	9,817,147
Revenue from external customers	131,820	116,875	121,794
Depreciation and amortisation	4,034,774	3,611,594	3,564,120
Interest income	45,789	22,209	25,581
Interest expense	557,218	477,512	503,485
Employee benefit expense	82,466	86,730	86,672
Loss on abandonment of property, plant and equipment	0	0	0
Increase in provisions, net	624,221	680,358	691,052
Operating profit (loss)	761,109	762,164	1,168,833
Profit (loss) related to associates and joint ventures	(753)	(18,146)	(4,905)
Segment assets	69,129,625	64,628,651
Investments in associates and joint ventures	143,304	141,885
Acquisition of non-current assets	2,008,409	1,959,479
Segment liabilities	42,843,974	38,361,337
Operating segments | Electric power generation (Non-nuclear)
Disclosure of operating segments [line items]
Total segment revenue	41,944,339	25,928,596	20,329,611
Intersegment revenue	39,252,851	24,518,167	19,552,376
Revenue from external customers	2,691,488	1,410,429	777,235
Depreciation and amortisation	4,091,081	4,182,470	4,034,024
Interest income	53,242	22,226	20,843
Interest expense	694,559	624,391	622,346
Employee benefit expense	140,067	121,020	112,775
Loss on abandonment of property, plant and equipment	0	5,672	17,679
Increase in provisions, net	619,947	285,152	346,195
Operating profit (loss)	289,001	370,440	(172,884)
Profit (loss) related to associates and joint ventures	329,112	109,765	115,096
Segment assets	69,468,039	57,310,164
Investments in associates and joint ventures	3,113,918	2,575,019
Acquisition of non-current assets	3,547,815	3,341,960
Segment liabilities	40,428,907	35,803,289
Operating segments | Plant maintenance & engineering service
Disclosure of operating segments [line items]
Total segment revenue	2,975,062	2,805,785	2,703,472
Intersegment revenue	2,516,699	2,370,900	2,283,333
Revenue from external customers	458,363	434,885	420,139
Depreciation and amortisation	123,168	121,493	119,056
Interest income	14,003	9,515	11,789
Interest expense	1,405	933	1,250
Employee benefit expense	82,070	94,269	101,255
Loss on abandonment of property, plant and equipment	0	0	0
Increase in provisions, net	213,671	213,500	230,264
Operating profit (loss)	239,529	245,360	197,553
Profit (loss) related to associates and joint ventures	1,886	11,849	1,740
Segment assets	4,051,157	3,672,366
Investments in associates and joint ventures	56,685	53,617
Acquisition of non-current assets	200,338	110,330
Segment liabilities	1,272,408	1,086,926
Operating segments | Others
Disclosure of operating segments [line items]
Total segment revenue	2,750,231	2,018,997	1,582,798
Intersegment revenue	1,803,231	1,295,423	1,096,663
Revenue from external customers	947,000	723,574	486,135
Depreciation and amortisation	211,719	159,222	122,092
Interest income	195,966	158,680	167,005
Interest expense	195,860	162,345	162,843
Employee benefit expense	53,017	52,698	50,889
Loss on abandonment of property, plant and equipment	3,125	0	940
Increase in provisions, net	9,463	2,981	3,711
Operating profit (loss)	333,547	208,139	149,607
Profit (loss) related to associates and joint ventures	0	0	0
Segment assets	12,895,981	10,870,812
Investments in associates and joint ventures	0	0
Acquisition of non-current assets	839,885	645,760
Segment liabilities	5,796,718	4,961,880
Material reconciling items
Disclosure of operating segments [line items]
Total segment revenue	(55,749,406)	(39,064,782)	(33,974,121)
Intersegment revenue	(55,749,406)	(39,064,782)	(33,974,121)
Revenue from external customers	0	0	0
Depreciation and amortisation	(129,334)	(122,751)	(127,628)
Interest income	(35,323)	(27,587)	(30,852)
Interest expense	(51,298)	(29,710)	(32,472)
Employee benefit expense	(52,034)	(36,187)	(49,605)
Loss on abandonment of property, plant and equipment	0	0	0
Increase in provisions, net	68,143	89,818	(169,651)
Operating profit (loss)	(239,843)	(64,775)	(291,187)
Profit (loss) related to associates and joint ventures	0	0	₩ 0
Segment assets	(51,763,535)	(40,936,783)
Investments in associates and joint ventures	0	0
Acquisition of non-current assets	(38,633)	(12,001)
Segment liabilities	(6,500,327)	(2,948,338)
Elimination of intersegment amounts
Disclosure of operating segments [line items]
Segment assets	(43,801,723)	(41,701,400)
Investments in associates and joint ventures	0	0
Acquisition of non-current assets	(38,633)	(12,001)
Segment liabilities	(9,304,648)	(8,101,011)
Equity method adjustment
Disclosure of operating segments [line items]
Segment assets	2,859,623	1,866,554
Investments in associates and joint ventures	0	0
Acquisition of non-current assets	0	0
Segment liabilities	0	0
Deferred taxes
Disclosure of operating segments [line items]
Segment assets	(452)	1,881
Investments in associates and joint ventures	0	0
Acquisition of non-current assets	0	0
Segment liabilities	2,801,832	5,248,627
Others
Disclosure of operating segments [line items]
Segment assets	(10,820,983)	(1,103,818)
Investments in associates and joint ventures	0	0
Acquisition of non-current assets	0	0
Segment liabilities	₩ 2,489	₩ (95,954)

Segment, Geographic and Other_5

Segment, Geographic and Other Information - Summary of Geographical Areas (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue
Total revenue from external customers (Notes 2,4, 35, 45, 47)		₩ 70,546,024	₩ 60,012,375	₩ 57,926,634
Non-current assets	[1]	188,431,533	182,333,348	176,505,403
Domestic
Revenue
Total revenue from external customers (Notes 2,4, 35, 45, 47)		69,142,730	58,771,252	56,775,375
Non-current assets	[1]	183,707,117	178,760,564	173,673,478
Overseas
Revenue
Total revenue from external customers (Notes 2,4, 35, 45, 47)	[2]	1,403,294	1,241,123	1,151,259
Non-current assets	[1],[2]	₩ 4,724,416	₩ 3,572,784	₩ 2,831,925
[1]The amounts exclude financial assets and deferred tax assets.[2]Middle East and other Asian countries make up the majority of overseas revenue and non-current non-current

Classification of Financial I_3

Classification of Financial Instruments - Classification of Financial Assets (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of financial assets [line items]
Cash and cash equivalents	₩ 3,234,780	₩ 2,635,238	₩ 2,029,584	₩ 1,810,129
Categories of current financial assets
Current financial assets at fair value through profit or loss	3,181,791	360,833
Current financial assets at amortized costs	16,762	15,422
Current Derivative assets	289,603	126,938
Other financial assets	798,819	1,365,603
Trade and other receivables	10,461,822	8,122,415
Total current financial assets And Cash and cash equivalents	17,983,577	12,626,449
Categories of Non-current Financial assets
Non-current financial assets at fair value through profit or loss	527,717	672,031
Non-current financial assets at fair value through other comprehensive income	502,829	435,107
Non-current financial assets at amortized costs	10,236	9,851
Non-current Derivative assets	728,421	520,845
Other financial assets	1,567,632	1,271,976
Trade and other receivables	2,153,080	1,906,861
Total non-current financial assets	5,489,915	4,816,671
Total financial assets	23,473,492	17,443,120
Financial assets at fair value through profit or loss
Disclosure of financial assets [line items]
Cash and cash equivalents	0	0
Categories of current financial assets
Current financial assets at fair value through profit or loss	3,181,791	360,833
Current financial assets at amortized costs	0	0
Current Derivative assets	154,730	93,374
Other financial assets	0	0
Trade and other receivables	0	0
Total current financial assets And Cash and cash equivalents	3,336,521	454,207
Categories of Non-current Financial assets
Non-current financial assets at fair value through profit or loss	527,717	672,031
Non-current financial assets at fair value through other comprehensive income	0	0
Non-current financial assets at amortized costs	0	0
Non-current Derivative assets	538,342	349,653
Other financial assets	0	0
Trade and other receivables	0	0
Total non-current financial assets	1,066,059	1,021,684
Total financial assets	4,402,580	1,475,891
Financial assets at fair value through other comprehensive income
Disclosure of financial assets [line items]
Cash and cash equivalents	0	0
Categories of current financial assets
Current financial assets at fair value through profit or loss	0	0
Current financial assets at amortized costs	0	0
Current Derivative assets	0	0
Other financial assets	0	0
Trade and other receivables	0	0
Total current financial assets And Cash and cash equivalents	0	0
Categories of Non-current Financial assets
Non-current financial assets at fair value through profit or loss	0	0
Non-current financial assets at fair value through other comprehensive income	502,829	435,107
Non-current financial assets at amortized costs	0	0
Non-current Derivative assets	0	0
Other financial assets	0	0
Trade and other receivables	0	0
Total non-current financial assets	502,829	435,107
Total financial assets	502,829	435,107
Financial assets at amortized cost
Disclosure of financial assets [line items]
Cash and cash equivalents	3,234,780	2,635,238
Categories of current financial assets
Current financial assets at fair value through profit or loss	0	0
Current financial assets at amortized costs	16,762	15,422
Current Derivative assets	0	0
Other financial assets	798,819	1,365,603
Trade and other receivables	10,461,822	8,122,415
Total current financial assets And Cash and cash equivalents	14,512,183	12,138,678
Categories of Non-current Financial assets
Non-current financial assets at fair value through profit or loss	0	0
Non-current financial assets at fair value through other comprehensive income	0	0
Non-current financial assets at amortized costs	10,236	9,851
Non-current Derivative assets	0	0
Other financial assets	1,567,632	1,271,976
Trade and other receivables	2,153,080	1,906,861
Total non-current financial assets	3,730,948	3,188,688
Total financial assets	18,243,131	15,327,366
Derivative assets (applying hedge accounting)
Disclosure of financial assets [line items]
Cash and cash equivalents	0	0
Categories of current financial assets
Current financial assets at fair value through profit or loss	0	0
Current financial assets at amortized costs	0	0
Current Derivative assets	134,873	33,564
Other financial assets	0	0
Trade and other receivables	0	0
Total current financial assets And Cash and cash equivalents	134,873	33,564
Categories of Non-current Financial assets
Non-current financial assets at fair value through profit or loss	0	0
Non-current financial assets at fair value through other comprehensive income	0	0
Non-current financial assets at amortized costs	0	0
Non-current Derivative assets	190,079	171,192
Other financial assets	0	0
Trade and other receivables	0	0
Total non-current financial assets	190,079	171,192
Total financial assets	₩ 324,952	₩ 204,756

Classification of Financial I_4

Classification of Financial Instruments - Classification of Financial Liabilities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Categories of current financial liabilities
Borrowings	₩ 12,457,853	₩ 4,382,218
Debt securities	10,201,149	9,647,616
Derivative liabilities	44,994	7,291
Trade and other payables	11,983,549	8,153,426
Total current financial liabilities	34,687,545	22,190,551
Categories of non-current financial liabilities
Borrowings	2,962,323	2,265,624
Debt securities	94,984,040	64,234,055
Derivative liabilities	387,757	70,740
Trade and other payables	5,638,914	5,996,498
Total non-current financial liabilities	103,973,034	72,566,917
Total financial liabilities	138,660,579	94,757,468
Financial liabilities at fair value through profit or loss
Categories of current financial liabilities
Borrowings	0	0
Debt securities	0	0
Derivative liabilities	44,994	6,838
Trade and other payables	0	0
Total current financial liabilities	44,994	6,838
Categories of non-current financial liabilities
Borrowings	0	0
Debt securities	0	0
Derivative liabilities	362,252	49,418
Trade and other payables	0	0
Total non-current financial liabilities	362,252	49,418
Total financial liabilities	407,246	56,256
Financial liabilities recognized at amortized cost
Categories of current financial liabilities
Borrowings	12,457,853	4,382,218
Debt securities	10,201,149	9,647,616
Derivative liabilities	0	0
Trade and other payables	11,983,549	8,153,426
Total current financial liabilities	34,642,551	22,183,260
Categories of non-current financial liabilities
Borrowings	2,962,323	2,265,624
Debt securities	94,984,040	64,234,055
Derivative liabilities	0	0
Trade and other payables	5,638,914	5,996,498
Total non-current financial liabilities	103,585,277	72,496,177
Total financial liabilities	138,227,828	94,679,437
Derivatives (applying hedge accounting)
Categories of current financial liabilities
Borrowings	0	0
Debt securities	0	0
Derivative liabilities	0	453
Trade and other payables	0	0
Total current financial liabilities	0	453
Categories of non-current financial liabilities
Borrowings	0	0
Debt securities	0	0
Derivative liabilities	25,505	21,322
Trade and other payables	0	0
Total non-current financial liabilities	25,505	21,322
Total financial liabilities	₩ 25,505	₩ 21,775

Classification of Financial I_5

Classification of Financial Instruments - Classification of Comprehensive Income (Loss) from Financial Instruments (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income, expense, gains or losses of financial instruments
Dividends income	₩ 28,875	₩ 10,522	₩ 7,316
Gain (loss) on valuation of derivatives	224,218	822,994	(455,715)
Gain (loss) on valuation of financial assets	32,661	34,444
Interest expense of trade and other payables	204,078	213,765	88,757
Interest expense of others	472,248	384,423	540,867
Other finance income	925	1,284	1,470
Other finance expenses	25,144	4,058	4,456
Cash and cash equivalents
Income, expense, gains or losses of financial instruments
Interest income	51,872	12,692	9,419
Gain (loss) on foreign currency transactions and translations	22,158	34,923	(15,911)
Financial assets at fair value through profit or loss
Income, expense, gains or losses of financial instruments
Interest income	58,540	18,415	19,114
Dividends income	1,994	2,949	4,734
Gain (loss) on valuation of derivatives	336,049	450,896	(52,447)
Gain (loss) on transaction of derivatives	205,298	54,352	36,563
Gain (loss) on valuation of financial assets	(37,230)	8,858	5,508
Gain on disposal of financial assets	9,358	4,221	11,344
Financial assets at fair value through other comprehensive income
Income, expense, gains or losses of financial instruments
Dividends income	26,881	7,573	2,582
Financial assets at amortized cost
Income, expense, gains or losses of financial instruments
Interest income	1,308	797	612
Gain (loss) on foreign currency transactions and translations	5,087	(3,647)	(1,733)
Loans and receivables
Income, expense, gains or losses of financial instruments
Interest income	33,545	25,196	26,232
Gain (loss) on foreign currency transactions and translations	596	729	(527)
Trade and other receivables
Income, expense, gains or losses of financial instruments
Interest income	164,653	144,543	151,035
Gain on disposal of financial assets	0	2,452	0
Gain (loss) on foreign currency transactions and translations	1,019	14,207	23,458
Short-term financial instruments
Income, expense, gains or losses of financial instruments
Interest income	15,827	7,531	25,540
Gain (loss) on foreign currency transactions and translations	3,513	32,218	(38,088)
Long-term financial instruments
Income, expense, gains or losses of financial instruments
Interest income	14,371	12,470	10,406
Gain (loss) on foreign currency transactions and translations	1	27	0
Other financial assets
Income, expense, gains or losses of financial instruments
Interest income	637	230	228
Derivative (applying hedge accounting)
Income, expense, gains or losses of financial instruments
Gain (loss) on valuation of derivatives	149,888	211,180	(77,733)
Gain (loss) on transaction of derivatives	54,422	31,351	36,053
Gain (loss) on valuation of derivatives (equity, before tax)	(93,699)	(11,734)	9,925
Financial liabilities at fair value through profit or loss
Income, expense, gains or losses of financial instruments
Gain (loss) on valuation of derivatives	(345,313)	2,751	(104,607)
Gain (loss) on transaction of derivatives	(110,236)	(15,358)	(49,788)
Financial liabilities carried at amortized cost
Income, expense, gains or losses of financial instruments
Gain (loss) on repayment of financial liabilities	(15)	(10)	(35)
Gain (loss) on foreign currency transactions and translations	(936,269)	(1,162,835)	772,045
Interest expense of borrowings and debt securities	2,142,220	1,316,269	1,365,801
Interest expense of trade and other payables	204,078	213,765	88,757
Interest expense of others	472,248	384,423	540,867
Other finance income	927	1,284	0
Other finance expenses	167	2,504	0
Derivatives (applying hedge accounting)
Income, expense, gains or losses of financial instruments
Gain (loss) on valuation of derivatives	83,594	158,167	(220,928)
Gain (loss) on transaction of derivatives	75,201	13,737	42,565
Gain (loss) on valuation of derivatives (equity, before tax)	₩ 28,647	₩ (28,726)	₩ 101,295

Restricted Deposits - Summary o

Restricted Deposits - Summary of Restricted Deposits (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Restricted Deposits [Line Items]
Total Restricted Deposits	₩ 1,310,402	₩ 1,288,589
Cash and cash equivalents
Restricted Deposits [Line Items]
Escrow accounts	2,912	0
Deposits for government project	30,586	22,286
Collateral provided for borrowings	250,346	264,813
Collateral provided for lawsuit	57	42
Deposits for transmission regional support program	8,626	5,921
Deposits for other business purposes	3,825	3,050
Short-term financial instruments
Restricted Deposits [Line Items]
Collateral provided for borrowings	1,000	11,745
Restriction on withdrawal related to 'win-win growth program' for small and medium enterprises	101,500	114,000
Non-Current financial assets at fair value through profit or loss
Restricted Deposits [Line Items]
Decommissioning costs of nuclear power plants	386,220	531,720
Long-term financial instruments
Restricted Deposits [Line Items]
Escrow accounts	1,603	70
Collateral provided for borrowings	21,745	0
Decommissioning costs of nuclear power plants	497,609	324,609
Guarantee deposits for banking accounts at oversea branches	18	333
Funds for developing small and medium enterprises	0	10,000
Other Non-current assets
Restricted Deposits [Line Items]
Deposits for other business purposes	₩ 4,355	₩ 0

Cash and Cash Equivalents - Sum

Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash and cash equivalents [abstract]
Cash	₩ 21,113	₩ 19,623
Other demand deposits	1,906,248	1,825,751
Short-term deposits, classified as cash equivalents	1,063,290	407,921
Short-term investments, classified as cash equivalents	244,129	381,943
Total cash and cash equivalents	₩ 3,234,780	₩ 2,635,238	₩ 2,029,584	₩ 1,810,129

Trade and Other Receivables - T

Trade and Other Receivables - Trade and Other Receivables (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022		Dec. 31, 2021
Disclosure of financial assets [line items]
Trade and other receivables	₩ 12,614,902		₩ 10,029,276
Current assets
Disclosure of financial assets [line items]
Trade and other receivables	10,461,822		8,122,415
Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	2,153,080		1,906,861
Gross amount
Disclosure of financial assets [line items]
Trade and other receivables	12,937,068		10,324,255
Gross amount | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	10,705,408		8,345,848
Gross amount | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	2,231,660		1,978,407
Allowance for doubtful accounts
Disclosure of financial assets [line items]
Trade and other receivables	(308,453)		(288,049)
Allowance for doubtful accounts | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	(241,217)		(222,393)
Allowance for doubtful accounts | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	(67,236)		(65,656)
Present value discount
Disclosure of financial assets [line items]
Trade and other receivables	(13,713)		(6,930)
Present value discount | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	(2,369)		(1,040)
Present value discount | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	(11,344)		(5,890)
Trade receivables
Disclosure of financial assets [line items]
Trade and other receivables	9,699,835		7,723,908
Trade receivables | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	9,504,051		7,539,897
Trade receivables | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	195,784		184,011
Trade receivables | Gross amount
Disclosure of financial assets [line items]
Trade and other receivables	9,898,835		7,929,247
Trade receivables | Gross amount | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	9,700,880		7,743,735
Trade receivables | Gross amount | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	197,955		185,512
Trade receivables | Allowance for doubtful accounts
Disclosure of financial assets [line items]
Trade and other receivables	(199,000)		(205,339)
Trade receivables | Allowance for doubtful accounts | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	(196,829)		(203,838)
Trade receivables | Allowance for doubtful accounts | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	(2,171)		(1,501)
Trade receivables | Present value discount | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	0		0
Trade receivables | Present value discount | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	0		0
Other receivables
Disclosure of financial assets [line items]
Trade and other receivables	2,915,067		2,305,368
Other receivables | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	957,771		582,518
Other receivables | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	1,957,296		1,722,850
Other receivables | Gross amount
Disclosure of financial assets [line items]
Trade and other receivables	3,038,233		2,395,008
Other receivables | Gross amount | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	1,004,528		602,113
Other receivables | Gross amount | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	2,033,705		1,792,895
Other receivables | Allowance for doubtful accounts
Disclosure of financial assets [line items]
Trade and other receivables	(109,453)		(82,710)
Other receivables | Allowance for doubtful accounts | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	(44,388)		(18,555)
Other receivables | Allowance for doubtful accounts | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	(65,065)		(64,155)
Other receivables | Present value discount
Disclosure of financial assets [line items]
Trade and other receivables	(13,713)		(6,930)
Other receivables | Present value discount | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	(2,369)		(1,040)
Other receivables | Present value discount | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	(11,344)		(5,890)
Non-trade receivables | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	417,931		215,079
Non-trade receivables | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	87,250		66,849
Non-trade receivables | Gross amount | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	459,245		232,172
Non-trade receivables | Gross amount | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	140,128		123,537
Non-trade receivables | Allowance for doubtful accounts | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	(41,293)		(17,084)
Non-trade receivables | Allowance for doubtful accounts | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	(52,696)		(56,407)
Non-trade receivables | Present value discount | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	(21)		(9)
Non-trade receivables | Present value discount | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	(182)		(281)
Accrued income | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	109,267		57,300
Accrued income | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	2,004		1,828
Accrued income | Gross amount | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	109,267		57,300
Accrued income | Gross amount | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	2,004		1,828
Accrued income | Allowance for doubtful accounts | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	0		0
Accrued income | Allowance for doubtful accounts | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	0		0
Accrued income | Present value discount | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	0		0
Accrued income | Present value discount | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	0		0
Deposits | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	287,232		211,635
Deposits | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	448,699		435,784
Deposits | Gross amount | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	289,580		212,666
Deposits | Gross amount | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	459,861		441,393
Deposits | Allowance for doubtful accounts | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	0		0
Deposits | Allowance for doubtful accounts | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	0		0
Deposits | Present value discount | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	(2,348)		(1,031)
Deposits | Present value discount | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	(11,162)		(5,609)
Finance lease receivables | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	65,781	[1]	60,435	[2]
Finance lease receivables | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	1,169,104	[3]	1,139,490	[4]
Finance lease receivables | Gross amount | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	67,583	[1]	60,613	[2]
Finance lease receivables | Gross amount | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	1,171,807	[3]	1,140,080	[4]
Finance lease receivables | Allowance for doubtful accounts | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	(1,802)	[1]	(178)	[2]
Finance lease receivables | Allowance for doubtful accounts | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	(2,703)	[3]	(590)	[4]
Finance lease receivables | Present value discount | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	0	[1]	0	[2]
Finance lease receivables | Present value discount | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	0	[3]	0	[4]
Others | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	77,560		38,069
Others | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	250,239		78,899
Others | Gross amount | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	78,853		39,362
Others | Gross amount | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	259,905		86,057
Others | Allowance for doubtful accounts | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	(1,293)		(1,293)
Others | Allowance for doubtful accounts | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	(9,666)		(7,158)
Others | Present value discount | Current assets
Disclosure of financial assets [line items]
Trade and other receivables	0		0
Others | Present value discount | Non-current assets
Disclosure of financial assets [line items]
Trade and other receivables	₩ 0		₩ 0
[1]Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of ￦114,347 million.[2]Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of ￦111,915 million.[3]Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of ￦1,024,927 million.[4]Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of ￦1,082,712 million.

Trade and Other Receivables -_2

Trade and Other Receivables - Trade and Other Receivables (Parenthetical) (Details) - Finance lease receivables - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Non-current assets
Trade and Other Receivables [Line Items]
Unearned finance income relating to finance lease payments receivable		₩ 1,082,712
Current assets
Trade and Other Receivables [Line Items]
Unearned finance income relating to finance lease payments receivable	₩ 114,347	₩ 111,915
Non-current assets
Trade and Other Receivables [Line Items]
Unearned finance income relating to finance lease payments receivable	₩ 1,024,927

Trade and Other Receivables - O

Trade and Other Receivables - Other Receivables (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Disclosure of financial assets that are either past due or impaired [line items]
Trade and other receivables	₩ 12,614,902	₩ 10,029,276
Gross amount
Disclosure of financial assets that are either past due or impaired [line items]
Trade and other receivables	12,937,068	10,324,255
Allowance for doubtful accounts
Disclosure of financial assets that are either past due or impaired [line items]
Trade and other receivables	(308,453)	(288,049)
Present value discount
Disclosure of financial assets that are either past due or impaired [line items]
Trade and other receivables	(13,713)	(6,930)
Trade receivables
Disclosure of financial assets that are either past due or impaired [line items]
Trade and other receivables	9,699,835	7,723,908
Trade receivables | Not overdue
Disclosure of financial assets that are either past due or impaired [line items]
Trade and other receivables	9,509,775	7,603,472
Trade receivables | Impairment reviewed
Disclosure of financial assets that are either past due or impaired [line items]
Trade and other receivables	389,060	325,775
Trade receivables | Impairment reviewed | Less than 60 days
Disclosure of financial assets that are either past due or impaired [line items]
Trade and other receivables	5,592	11,577
Trade receivables | Impairment reviewed | 60 ~ 90 days
Disclosure of financial assets that are either past due or impaired [line items]
Trade and other receivables	36,389	27,201
Trade receivables | Impairment reviewed | 90 ~ 120 days
Disclosure of financial assets that are either past due or impaired [line items]
Trade and other receivables	31,442	28,230
Trade receivables | Impairment reviewed | 120 days ~ 1year
Disclosure of financial assets that are either past due or impaired [line items]
Trade and other receivables	99,655	51,945
Trade receivables | Impairment reviewed | Over 1 year
Disclosure of financial assets that are either past due or impaired [line items]
Trade and other receivables	215,982	206,822
Trade receivables | Gross amount
Disclosure of financial assets that are either past due or impaired [line items]
Trade and other receivables	9,898,835	7,929,247
Trade receivables | Allowance for doubtful accounts
Disclosure of financial assets that are either past due or impaired [line items]
Trade and other receivables	(199,000)	(205,339)
Other receivables
Disclosure of financial assets that are either past due or impaired [line items]
Trade and other receivables	2,915,067	2,305,368
Other receivables | Not overdue
Disclosure of financial assets that are either past due or impaired [line items]
Trade and other receivables	2,857,253	2,251,474
Other receivables | Impairment reviewed
Disclosure of financial assets that are either past due or impaired [line items]
Trade and other receivables	180,980	143,534
Other receivables | Impairment reviewed | Less than 60 days
Disclosure of financial assets that are either past due or impaired [line items]
Trade and other receivables	92	87
Other receivables | Impairment reviewed | 60 ~ 90 days
Disclosure of financial assets that are either past due or impaired [line items]
Trade and other receivables	13,643	4,881
Other receivables | Impairment reviewed | 90 ~ 120 days
Disclosure of financial assets that are either past due or impaired [line items]
Trade and other receivables	2,982	1,248
Other receivables | Impairment reviewed | 120 days ~ 1year
Disclosure of financial assets that are either past due or impaired [line items]
Trade and other receivables	18,494	11,438
Other receivables | Impairment reviewed | Over 1 year
Disclosure of financial assets that are either past due or impaired [line items]
Trade and other receivables	145,769	125,880
Other receivables | Gross amount
Disclosure of financial assets that are either past due or impaired [line items]
Trade and other receivables	3,038,233	2,395,008
Other receivables | Allowance for doubtful accounts
Disclosure of financial assets that are either past due or impaired [line items]
Trade and other receivables	(109,453)	(82,710)
Other receivables | Present value discount
Disclosure of financial assets that are either past due or impaired [line items]
Trade and other receivables	₩ (13,713)	₩ (6,930)

Trade and Other Receivables - C

Trade and Other Receivables - Changes in the Allowance for Doubtful Accounts (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Trade receivables
Reconciliation of changes in allowance account for credit losses of financial assets [Line Items]
Beginning balance	₩ 205,339	₩ 208,990	₩ 212,759
Changes in allowance account for credit losses of financial assets
Bad debt expense	27,078	19,039	24,021
Write-off	(26,319)	(21,809)	(20,332)
Reversal	(3,444)	(1,071)	(3,373)
Others	(3,654)	190	(4,085)
Ending balance	199,000	205,339	208,990
Other receivables
Reconciliation of changes in allowance account for credit losses of financial assets [Line Items]
Beginning balance	82,710	132,379	114,155
Changes in allowance account for credit losses of financial assets
Bad debt expense	4,220	18,411	27,329
Write-off	(1,103)	(58,762)	(1,910)
Reversal	(37)	(79)	(2,464)
Others	23,663	(9,239)	(4,731)
Ending balance	₩ 109,453	₩ 82,710	₩ 132,379

Trade and Other Receivables -

Trade and Other Receivables - Additional Information (Details)	Dec. 31, 2022
Trade and other receivables [abstract]
Percentage of interest rate applied on the overdue trade receivables	1.50%

Financial Assets at Fair Valu_5

Financial Assets at Fair Value Through Profit or Loss - Summary of Financial Assets at Fair Value Through Profit or Loss (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2022	Dec. 31, 2021
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Current financial assets at fair value through profit or loss		₩ 3,181,791	₩ 360,833
Non-current financial assets at fair value through profit or loss		527,717	672,031
Financial assets at fair value through profit or loss
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Current financial assets at fair value through profit or loss		3,181,791	360,833
Non-current financial assets at fair value through profit or loss		301,121	413,960
Financial assets at fair value through profit or loss | Beneficiary Certificate
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Current financial assets at fair value through profit or loss		294	629
Non-current financial assets at fair value through profit or loss		121,406	206,160
Financial assets at fair value through profit or loss | Cooperative
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Current financial assets at fair value through profit or loss		0	0
Non-current financial assets at fair value through profit or loss		6,329	5,797
Financial assets at fair value through profit or loss | Others
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Current financial assets at fair value through profit or loss	[1]	3,181,497	360,204
Non-current financial assets at fair value through profit or loss	[1]	173,386	202,003
Financial assets designated as at fair value through profit or loss | Debt with embedded derivatives
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Current financial assets at fair value through profit or loss		0	0
Non-current financial assets at fair value through profit or loss		₩ 226,596	₩ 258,071
[1]‘Other’ includes MMT which is composed of government bonds, RP(Repurchase Paper), CP(Commercial Paper), etc.

Financial Assets at Fair Valu_6

Financial Assets at Fair Value Through Profit or Loss - Summary of Income (Loss) from Financial Assets at fair Value Through Profit or Loss (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Gains (losses) on financial assets at fair value through profit or loss	₩ 32,661	₩ 34,444
Financial assets at fair value through profit or loss | Beneficiary Certificate
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Gains (losses) on financial assets at fair value through profit or loss	4,527	13,632
Financial assets at fair value through profit or loss | Cooperative securities
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Gains (losses) on financial assets at fair value through profit or loss	120	110
Financial assets at fair value through profit or loss | Debt with embedded derivatives
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Gains (losses) on financial assets at fair value through profit or loss	946	854
Financial assets at fair value through profit or loss | Others
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Gains (losses) on financial assets at fair value through profit or loss	₩ 27,068	₩ 19,848

Financial Assets at Fair Valu_7

Financial Assets at Fair Value Through Other Comprehensive Income - Summary of Changes in Financial Assets at Fair Value Through Other Comprehensive Income (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021
Changes in financial assets at fair value through other comprehensive income [Line Items]
Beginning balance		₩ 435,107		₩ 358,559
Acquisition		9,451		10,929
Disposal		0		(8,221)
Valuation		61,860		68,777
Others		(3,589)		5,063
Ending Balance		502,829		435,107
Listed equity securities
Changes in financial assets at fair value through other comprehensive income [Line Items]
Beginning balance		273,826		194,669
Acquisition		0		1,500
Disposal		0		(8,208)
Valuation		28,585		81,112
Others		(2,354)		4,753
Ending Balance		300,057		273,826
Unlisted equity securities
Changes in financial assets at fair value through other comprehensive income [Line Items]
Beginning balance		160,790	[1]	163,890
Acquisition		9,451		8,929
Disposal		0		(13)
Valuation		33,237		(12,335)
Others		(1,235)		319
Ending Balance	[1]	202,243		160,790
Corporate bond
Changes in financial assets at fair value through other comprehensive income [Line Items]
Beginning balance		491		0
Acquisition		0		500
Disposal		0		0
Valuation		38		0
Others		0		(9)
Ending Balance		529		491
Listed and unlisted equity securties
Changes in financial assets at fair value through other comprehensive income [Line Items]
Beginning balance		434,616		358,559
Acquisition		9,451		10,429
Disposal		0		(8,221)
Valuation		61,822		68,777
Others		(3,589)		5,072
Ending Balance		502,300		434,616
Current Financial assets at fair value through other comprehensive income category
Changes in financial assets at fair value through other comprehensive income [Line Items]
Beginning balance		0		0
Acquisition		0		0
Disposal		0		0
Valuation		0		0
Others		0		0
Ending Balance		0		0
Non-Current Financial assets at fair value through other comprehensive income category
Changes in financial assets at fair value through other comprehensive income [Line Items]
Beginning balance		435,107		358,559
Acquisition		9,451		10,929
Disposal		0		(8,221)
Valuation		61,860		68,777
Others		(3,589)		5,063
Ending Balance		₩ 502,829		₩ 435,107
[1]The Company used initial cost as their fair value because there was not enough information to determine fair value, and the range of the estimated fair value is wide.

Financial Assets at Fair Valu_8

Financial Assets at Fair Value Through Other Comprehensive Income - Summary of Financial Assets at Fair Value Through Other Comprehensive Income (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Financial assets at fair value through other comprehensive income [Line Items]
Acquisition Cost		₩ 594,355		₩ 589,194
Book value		502,829		435,107		₩ 358,559
Fair value		502,829		435,107
Listed equity securities
Financial assets at fair value through other comprehensive income [Line Items]
Acquisition Cost		324,790		324,790
Book value		300,057		273,826		194,669
Fair value		₩ 300,057		₩ 273,826
Korea District Heating Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		2,264,068		2,264,068
Ownership		19.55%		19.55%
Acquisition Cost		₩ 173,201		₩ 173,201
Book value		64,526		87,733
Fair value		₩ 64,526		₩ 87,733
Ssangyong Motor Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		12,205		38,568
Ownership		0.03%		0.03%
Acquisition Cost		₩ 428		₩ 428
Book value		107		0
Fair value		₩ 107		₩ 0
SM Korea Line Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		180		180
Ownership		0%		0%
Acquisition Cost		₩ 1		₩ 1
Book value		0		0
Fair value		₩ 0		₩ 0
Namkwang Engineering & Construction Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		121		121
Ownership		0%		0%
Acquisition Cost		₩ 15		₩ 15
Book value		0		1
Fair value		₩ 0		₩ 1
Bumyang Construction Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		35		35
Ownership		0%		0%
Acquisition Cost		₩ 2		₩ 2
Book value		0		0
Fair value		₩ 0		₩ 0
ELCOMTEC Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		32,875		32,875
Ownership		0.04%		0.04%
Acquisition Cost		₩ 217		₩ 217
Book value		34		42
Fair value		₩ 34		₩ 42
PAN Ocean Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,492		1,492
Ownership		0%		0%
Acquisition Cost		₩ 14		₩ 14
Book value		9		8
Fair value		₩ 9		₩ 8
STX Heavy Industries Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		7,419		7,419
Ownership		0.03%		0.03%
Acquisition Cost		₩ 107		₩ 107
Book value		54		35
Fair value		₩ 54		₩ 35
Codes Combine Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		291		291
Ownership		0%		0%
Acquisition Cost		₩ 1		₩ 1
Book value		1		1
Fair value		₩ 1		₩ 1
PT Adaro Energy Tbk.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		480,000,000		480,000,000
Ownership		1.50%		1.50%
Acquisition Cost		₩ 65,028		₩ 65,028
Book value		149,503		89,747
Fair value		₩ 149,503		₩ 89,747
Denison Mines Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		58,284,000		58,284,000
Ownership		7.09%		9.76%
Acquisition Cost		₩ 84,134		₩ 84,134
Book value		84,502		94,376
Fair value		₩ 84,502		₩ 94,376
Fission Uranium Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		100,000		100,000
Ownership		1.73%		0.02%
Acquisition Cost		₩ 41		₩ 41
Book value		75		73
Fair value		₩ 75		₩ 73
SangSangin Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		5,831		5,831
Ownership		0.01%		0.01%
Acquisition Cost		₩ 38		₩ 38
Book value		3		6
Fair value		₩ 3		₩ 6
Vitzosys Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		399		399
Ownership		0%		0%
Acquisition Cost		₩ 2		₩ 2
Book value		0		2
Fair value		₩ 0		₩ 2
EMnI Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		628		628
Ownership		0%		0%
Acquisition Cost		₩ 25		₩ 25
Book value		3		2
Fair value		₩ 3		₩ 2
Vissem electronics, Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares		229		229
Ownership		0%		0%
Acquisition Cost		₩ 11		₩ 11
Book value		1		2
Fair value		₩ 1		₩ 2
KC Industry Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares		139		139
Ownership		0%		0%
Acquisition Cost		₩ 6		₩ 6
Book value		0		1
Fair value		₩ 0		₩ 1
Ihsung CNI Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		142,860		142,860
Ownership		4.81%		4.81%
Acquisition Cost		₩ 1,500		₩ 1,500
Book value		1,229		1,779
Fair value		₩ 1,229		₩ 1,779
Aone Alform Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares		2,672		2,672
Ownership		0.04%		0.08%
Acquisition Cost		₩ 19		₩ 19
Book value		10		18
Fair value		10		18
Unlisted equity securities
Financial assets at fair value through other comprehensive income [Line Items]
Acquisition Cost	[1]	269,065		263,904
Book value		202,243	[1]	160,790	[1]	₩ 163,890
Fair value	[1]	₩ 202,243		₩ 160,790
Intellectual Discovery Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	200,000		1,000,000
Ownership	[1]	6%		6%
Acquisition Cost	[1]	₩ 5,000		₩ 5,000
Book value	[1]	954		954
Fair value	[1]	₩ 954		₩ 954
Hwan Young Steel Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	10,916		10,916
Ownership	[1]	0.14%		0.14%
Acquisition Cost	[1]	₩ 1,092		₩ 1,092
Book value	[1]	97		97
Fair value	[1]	₩ 97		₩ 97
SAMBO AUTO. Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	15,066		15,066
Ownership	[1]	0.02%		0.02%
Acquisition Cost	[1]	₩ 38		₩ 38
Book value	[1]	38		38
Fair value	[1]	₩ 38		₩ 38
Mobo Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	504		504
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 14		₩ 14
Book value	[1]	14		14
Fair value	[1]	₩ 14		₩ 14
Dae Kwang Semiconductor Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	589		589
Ownership	[1]	0.07%		0.07%
Acquisition Cost	[1]	₩ 6		₩ 6
Book value	[1]	6		6
Fair value	[1]	₩ 6		₩ 6
Sanbon Department Store
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	828		828
Ownership	[1]	0.01%		0.01%
Acquisition Cost	[1]	₩ 124		₩ 124
Book value	[1]	3		3
Fair value	[1]	₩ 3		₩ 3
Miju Steel Mfg. Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,097		1,097
Ownership	[1]	0.23%		0.23%
Acquisition Cost	[1]	₩ 50		₩ 50
Book value	[1]	50		50
Fair value	[1]	₩ 50		₩ 50
Sungwon Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	117		117
Ownership	[1]	0.07%		0.07%
Acquisition Cost	[1]	₩ 29		₩ 29
Book value	[1]	29		29
Fair value	[1]	₩ 29		₩ 29
IMHWA Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	329		329
Ownership	[1]	0.11%		0.11%
Acquisition Cost	[1]	₩ 5		₩ 5
Book value	[1]	5		5
Fair value	[1]	₩ 5		₩ 5
DALIM Special Vehicle Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	58		58
Ownership	[1]	0.08%		0.08%
Acquisition Cost	[1]	₩ 10		₩ 10
Book value	[1]	10		10
Fair value	[1]	₩ 10		₩ 10
ASA JEONJU Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			34,846
Ownership	[1]			1.34%
Acquisition Cost	[1]			₩ 697
Book value	[1]			69
Fair value	[1]			₩ 69
Moonkyung Silica Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	42		42
Ownership	[1]	0.56%		0.56%
Acquisition Cost	[1]	₩ 0		₩ 0
Book value	[1]	0		0
Fair value	[1]	₩ 0		₩ 0
Sungkwang Timber Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	3		3
Ownership	[1]	0.08%		0.08%
Acquisition Cost	[1]	₩ 5		₩ 5
Book value	[1]	5		5
Fair value	[1]	₩ 5		₩ 5
HJ Steel Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			218
Ownership	[1]			0.07%
Acquisition Cost	[1]			₩ 2
Book value	[1]			2
Fair value	[1]			₩ 2
KS Remicon Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	12		12
Ownership	[1]	0.04%		0.04%
Acquisition Cost	[1]	₩ 3		₩ 3
Book value	[1]	3		3
Fair value	[1]	₩ 3		₩ 3
Joongang Platec Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	3,591		3,591
Ownership	[1]	0.75%		0.75%
Acquisition Cost	[1]	₩ 72		₩ 72
Book value	[1]	35		35
Fair value	[1]	₩ 35		₩ 35
Pyungsan SI Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	434		434
Ownership	[1]	0.01%		0.01%
Acquisition Cost	[1]	₩ 4		₩ 9
Book value	[1]	4		9
Fair value	[1]	₩ 4		₩ 9
Samgong Development Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	12		12
Ownership	[1]	0.01%		0.01%
Acquisition Cost	[1]	₩ 7		₩ 7
Book value	[1]	7		7
Fair value	[1]	₩ 7		₩ 7
Joongang Development Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	540		540
Ownership	[1]	0.12%		0.12%
Acquisition Cost	[1]	₩ 8		₩ 8
Book value	[1]	8		8
Fair value	[1]	₩ 8		₩ 8
AJS Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	12,906		12,906
Ownership	[1]	0.23%		0.23%
Acquisition Cost	[1]	₩ 32		₩ 32
Book value	[1]	32		32
Fair value	[1]	₩ 32		₩ 32
MSE Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	429		429
Ownership	[1]	0.13%		0.13%
Acquisition Cost	[1]	₩ 9		₩ 9
Book value	[1]	9		9
Fair value	[1]	₩ 9		₩ 9
Ilrim Nano Tec Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,520		1,520
Ownership	[1]	0.07%		0.07%
Acquisition Cost	[1]	₩ 15		₩ 15
Book value	[1]	15		15
Fair value	[1]	₩ 15		₩ 15
Youngjin Hi-Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			11,109
Ownership	[1]			0.25%
Acquisition Cost	[1]			₩ 255
Book value	[1]			150
Fair value	[1]			₩ 150
Buyoung Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			270
Ownership	[1]			0%
Acquisition Cost	[1]			₩ 3
Book value	[1]			3
Fair value	[1]			₩ 3
Ilsuk Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	152		152
Ownership	[1]	0.17%		0.17%
Acquisition Cost	[1]	₩ 10		₩ 10
Book value	[1]	10		10
Fair value	[1]	₩ 10		₩ 10
Zyle Daewoo Motor Sales Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	22		22
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 0		₩ 0
Book value	[1]	0		0
Fair value	[1]	₩ 0		₩ 0
Daewoo Development Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	8		8
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 0		₩ 0
Book value	[1]	0		0
Fair value	[1]	₩ 0		₩ 0
Seyang Inc.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	537		537
Ownership	[1]	0.05%		0.05%
Acquisition Cost	[1]	₩ 27		₩ 27
Book value	[1]	30		27
Fair value	[1]	₩ 30		₩ 27
Seungri Enterprise Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	93		93
Ownership	[1]	0.05%		0.05%
Acquisition Cost	[1]	₩ 3		₩ 3
Book value	[1]	3		3
Fair value	[1]	₩ 3		₩ 3
Shin-E P&C Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,569		1,569
Ownership	[1]	0.64%		0.64%
Acquisition Cost	[1]	₩ 110		₩ 111
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
Ejung Ad Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	132		132
Ownership	[1]	0.09%		0.09%
Acquisition Cost	[1]	₩ 3		₩ 3
Book value	[1]	3		3
Fair value	[1]	₩ 3		₩ 3
Solvus Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,056		1,056
Ownership	[1]	0.04%		0.04%
Acquisition Cost	[1]	₩ 3		₩ 3
Book value	[1]	3		3
Fair value	[1]	₩ 3		₩ 3
Myung Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	89		89
Ownership	[1]	0.05%		0.05%
Acquisition Cost	[1]	₩ 2		₩ 2
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
Biwang Industry Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	406		406
Ownership	[1]	0.04%		0.04%
Acquisition Cost	[1]	₩ 2		₩ 2
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
Young Sung Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	89		89
Ownership	[1]	0.40%		0.40%
Acquisition Cost	[1]	₩ 26		₩ 26
Book value	[1]	26		26
Fair value	[1]	₩ 26		₩ 26
Yuil Industrial Electronics Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	804		804
Ownership	[1]	0.32%		0.32%
Acquisition Cost	[1]	₩ 15		₩ 15
Book value	[1]	15		15
Fair value	[1]	₩ 15		₩ 15
Woojin Industry Corporation
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	3		3
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 16		₩ 16
Book value	[1]	16		16
Fair value	[1]	₩ 16		₩ 16
Kwang Sung Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	325		325
Ownership	[1]	0.35%		0.35%
Acquisition Cost	[1]	₩ 7		₩ 7
Book value	[1]	7		7
Fair value	[1]	₩ 7		₩ 7
Futech Mold Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	274		274
Ownership	[1]	0.27%		0.27%
Acquisition Cost	[1]	₩ 14		₩ 14
Book value	[1]	14		14
Fair value	[1]	₩ 14		₩ 14
Woojoo Environment Ind. Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	101		101
Ownership	[1]	0.11%		0.11%
Acquisition Cost	[1]	₩ 13		₩ 13
Book value	[1]	13		13
Fair value	[1]	₩ 13		₩ 13
Hyungji Esquire Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	61		61
Ownership	[1]	0.02%		0.02%
Acquisition Cost	[1]	₩ 22		₩ 22
Book value	[1]	22		22
Fair value	[1]	₩ 22		₩ 22
Morado Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	209		209
Ownership	[1]	0.04%		0.04%
Acquisition Cost	[1]	₩ 2		₩ 2
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
Myung Sung Tex Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	20		20
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 2		₩ 2
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
Kwang Sung Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	610		610
Ownership	[1]	0.53%		0.53%
Acquisition Cost	[1]	₩ 31		₩ 31
Book value	[1]	31		31
Fair value	[1]	₩ 31		₩ 31
Seen Business and Technology co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	29,424		29,424
Ownership	[1]	0.73%		0.73%
Acquisition Cost	[1]	₩ 148		₩ 148
Book value	[1]	7		7
Fair value	[1]	₩ 7		₩ 7
Woobang Construction Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	8		8
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 8		₩ 8
Book value	[1]	8		8
Fair value	[1]	₩ 8		₩ 8
Shin Pyung Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	6		6
Ownership	[1]	0.03%		0.03%
Acquisition Cost	[1]	₩ 3		₩ 3
Book value	[1]	3		3
Fair value	[1]	₩ 3		₩ 3
JMC Heavy Industries Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	2,724		2,724
Ownership	[1]	0.10%		0.10%
Acquisition Cost	[1]	₩ 27		₩ 27
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
Najin Steel Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	37		37
Ownership	[1]	0.06%		0.06%
Acquisition Cost	[1]	₩ 5		₩ 5
Book value	[1]	5		5
Fair value	[1]	₩ 5		₩ 5
Sinkwang Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,091		1,091
Ownership	[1]	1.68%		1.68%
Acquisition Cost	[1]	₩ 5		₩ 5
Book value	[1]	5		5
Fair value	[1]	₩ 5		₩ 5
Elephant & Friends Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	563		563
Ownership	[1]	0.61%		0.61%
Acquisition Cost	[1]	₩ 3		₩ 3
Book value	[1]	3		3
Fair value	[1]	₩ 3		₩ 3
Mireco Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	109		109
Ownership	[1]	0.25%		0.25%
Acquisition Cost	[1]	₩ 11		₩ 11
Book value	[1]	11		11
Fair value	[1]	₩ 11		₩ 11
L&K Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,615		1,615
Ownership	[1]	0.60%		0.60%
Acquisition Cost	[1]	₩ 24		₩ 24
Book value	[1]	24		24
Fair value	[1]	₩ 24		₩ 24
JO Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,263		1,263
Ownership	[1]	0.62%		0.62%
Acquisition Cost	[1]	₩ 25		₩ 25
Book value	[1]	25		25
Fair value	[1]	₩ 25		₩ 25
Kendae Printing Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	422		422
Ownership	[1]	0.60%		0.60%
Acquisition Cost	[1]	₩ 21		₩ 21
Book value	[1]	21		21
Fair value	[1]	₩ 21		₩ 21
Dauning Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	231		231
Ownership	[1]	0.41%		0.41%
Acquisition Cost	[1]	₩ 6		₩ 6
Book value	[1]	6		6
Fair value	[1]	₩ 6		₩ 6
Korea Trecision Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	22		22
Ownership	[1]	0.45%		0.45%
Acquisition Cost	[1]	₩ 5		₩ 5
Book value	[1]	5		5
Fair value	[1]	₩ 5		₩ 5
Ace Track Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			3,130
Ownership	[1]			1.08%
Acquisition Cost	[1]			₩ 219
Book value	[1]			59
Fair value	[1]			₩ 59
Dung Hwan Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			556
Ownership	[1]			0.02%
Acquisition Cost	[1]			₩ 6
Book value	[1]			6
Fair value	[1]			₩ 6
Hurim Biocell Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,021		1,021
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 5		₩ 5
Book value	[1]	5		5
Fair value	[1]	₩ 5		₩ 5
Smart Power Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	133,333		133,333
Ownership	[1]	4.14%		4.14%
Acquisition Cost	[1]	₩ 200		₩ 200
Book value	[1]	200		200
Fair value	[1]	₩ 200		₩ 200
Sunjin Power Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	4,941		4,941
Ownership	[1]	0.92%		0.92%
Acquisition Cost	[1]	₩ 247		₩ 247
Book value	[1]	32		32
Fair value	[1]	₩ 32		₩ 32
Beer Yeast Korea Inc.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,388		1,388
Ownership	[1]	0.43%		0.43%
Acquisition Cost	[1]	₩ 7		₩ 7
Book value	[1]	7		7
Fair value	[1]	₩ 7		₩ 7
B CON Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	96		96
Ownership	[1]	1.16%		1.16%
Acquisition Cost	[1]	₩ 6		₩ 6
Book value	[1]	6		6
Fair value	[1]	₩ 6		₩ 6
Ace Integration Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	105		105
Ownership	[1]	0.09%		0.09%
Acquisition Cost	[1]	₩ 24		₩ 24
Book value	[1]	24		24
Fair value	[1]	₩ 24		₩ 24
AceInti Agricultural Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	16		16
Ownership	[1]	0.02%		0.02%
Acquisition Cost	[1]	₩ 5		₩ 5
Book value	[1]	5		5
Fair value	[1]	₩ 5		₩ 5
KyungDong Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	130		130
Ownership	[1]	0.01%		0.01%
Acquisition Cost	[1]	₩ 1		₩ 1
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
ChunWon Development Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	193		193
Ownership	[1]	0.19%		0.19%
Acquisition Cost	[1]	₩ 39		₩ 39
Book value	[1]	39		39
Fair value	[1]	₩ 39		₩ 39
SungLim Industrial Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	29		29
Ownership	[1]	0.03%		0.03%
Acquisition Cost	[1]	₩ 1		₩ 1
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
Korea Minerals Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	191		191
Ownership	[1]	0.05%		0.05%
Acquisition Cost	[1]	₩ 134		₩ 134
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
HyoDong Development Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	128		128
Ownership	[1]	0.16%		0.16%
Acquisition Cost	[1]	₩ 25		₩ 25
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
Haspe Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			652
Ownership	[1]			0.55%
Acquisition Cost	[1]			₩ 20
Book value	[1]			20
Fair value	[1]			₩ 20
JoHyun Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	350		350
Ownership	[1]	1.56%		1.56%
Acquisition Cost	[1]	₩ 18		₩ 18
Book value	[1]	18		18
Fair value	[1]	₩ 18		₩ 18
KC Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	5,107		5,107
Ownership	[1]	0.17%		0.17%
Acquisition Cost	[1]	₩ 26		₩ 26
Book value	[1]	26		26
Fair value	[1]	₩ 26		₩ 26
SeongJi Industrial Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	41		41
Ownership	[1]	0.05%		0.05%
Acquisition Cost	[1]	₩ 1		₩ 1
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
Seyang Precision Ind.Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	829		829
Ownership	[1]	0.23%		0.23%
Acquisition Cost	[1]	₩ 41		₩ 41
Book value	[1]	41		41
Fair value	[1]	₩ 41		₩ 41
Dooriwon Food System Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	13		13
Ownership	[1]	0.27%		0.27%
Acquisition Cost	[1]	₩ 1		₩ 1
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
ShinShin Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			339
Ownership	[1]			1.12%
Acquisition Cost	[1]			₩ 17
Book value	[1]			17
Fair value	[1]			₩ 17
Sung Kwang Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	23		23
Ownership	[1]	0.37%		0.37%
Acquisition Cost	[1]	₩ 6		₩ 6
Book value	[1]	6		6
Fair value	[1]	₩ 6		₩ 6
Shinheung Petrol. Co. Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	699		699
Ownership	[1]	0.14%		0.14%
Acquisition Cost	[1]	₩ 35		₩ 35
Book value	[1]	35		35
Fair value	[1]	₩ 35		₩ 35
Force TEC Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	3,501		3,501
Ownership	[1]	0.02%		0.02%
Acquisition Cost	[1]	₩ 18		₩ 18
Book value	[1]	18		18
Fair value	[1]	₩ 18		₩ 18
Samsung Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	486		486
Ownership	[1]	1.28%		1.28%
Acquisition Cost	[1]	₩ 97		₩ 97
Book value	[1]	36		36
Fair value	[1]	₩ 36		₩ 36
Younil Metal Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	41		41
Ownership	[1]	0.21%		0.21%
Acquisition Cost	[1]	₩ 21		₩ 21
Book value	[1]	21		21
Fair value	[1]	₩ 21		₩ 21
CJ Paradise Co.,Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	24		24
Ownership	[1]	0.02%		0.02%
Acquisition Cost	[1]	₩ 12		₩ 12
Book value	[1]	12		12
Fair value	[1]	₩ 12		₩ 12
Han Young Technology Company Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	35		35
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 0		₩ 0
Book value	[1]	0		0
Fair value	[1]	₩ 0		₩ 0
K Shipbuilding Co., Ltd. (formerly, STX Offshore & Shipbuilding Co., Ltd.)
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			8,622
Ownership	[1]			0.25%
Acquisition Cost	[1]			₩ 1,078
Book value	[1]			1,078
Fair value	[1]			₩ 1,078
Ptotronics Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	843		843
Ownership	[1]	0.42%		0.42%
Acquisition Cost	[1]	₩ 84		₩ 84
Book value	[1]	6		6
Fair value	[1]	₩ 6		₩ 6
NFT Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	136		136
Ownership	[1]	0.40%		0.40%
Acquisition Cost	[1]	₩ 8		₩ 8
Book value	[1]	8		8
Fair value	[1]	₩ 8		₩ 8
Hyundaitech Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,363		1,363
Ownership	[1]	0.87%		0.87%
Acquisition Cost	[1]	₩ 27		₩ 27
Book value	[1]	27		27
Fair value	[1]	₩ 27		₩ 27
Dasan Material Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	29		29
Ownership	[1]	0.04%		0.04%
Acquisition Cost	[1]	₩ 22		₩ 22
Book value	[1]	22		22
Fair value	[1]	₩ 22		₩ 22
Fish World Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	47		47
Ownership	[1]	0.21%		0.21%
Acquisition Cost	[1]	₩ 2		₩ 2
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
SG Shinsung Engineering and Construction Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	10		10
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 6		₩ 6
Book value	[1]	0		0
Fair value	[1]	₩ 0		₩ 0
Samdo Industry Electric Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	48		48
Ownership	[1]	0.02%		0.02%
Acquisition Cost	[1]	₩ 1		₩ 1
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
Taejung Industries Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	9,268		9,268
Ownership	[1]	0.30%		0.30%
Acquisition Cost	[1]	₩ 5		₩ 5
Book value	[1]	5		5
Fair value	[1]	₩ 5		₩ 5
Shinsei Trading Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	64		64
Ownership	[1]	0.72%		0.72%
Acquisition Cost	[1]	₩ 6		₩ 6
Book value	[1]	6		6
Fair value	[1]	₩ 6		₩ 6
Dynamic Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	111		111
Ownership	[1]	0.19%		0.19%
Acquisition Cost	[1]	₩ 3		₩ 3
Book value	[1]	3		3
Fair value	[1]	₩ 3		₩ 3
Green Alchemy Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	38,202		38,202
Ownership	[1]	1.48%		1.48%
Acquisition Cost	[1]	₩ 191		₩ 191
Book value	[1]	17		17
Fair value	[1]	₩ 17		₩ 17
Youone TBM Engineering & Construction Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	615		615
Ownership	[1]	0.27%		0.27%
Acquisition Cost	[1]	₩ 31		₩ 31
Book value	[1]	31		31
Fair value	[1]	₩ 31		₩ 31
KM Leatech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,648		1,648
Ownership	[1]	0.98%		0.98%
Acquisition Cost	[1]	₩ 8		₩ 8
Book value	[1]	8		8
Fair value	[1]	₩ 8		₩ 8
Semist Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	555		555
Ownership	[1]	0.80%		0.80%
Acquisition Cost	[1]	₩ 3		₩ 3
Book value	[1]	3		3
Fair value	[1]	₩ 3		₩ 3
Sewon Bus Co.,Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	12		12
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 0		₩ 0
Book value	[1]	0		0
Fair value	[1]	₩ 0		₩ 0
Enertec Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	7,937		7,937
Ownership	[1]	0.19%		0.19%
Acquisition Cost	[1]	₩ 44		₩ 44
Book value	[1]	44		44
Fair value	[1]	₩ 44		₩ 44
Sangji Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	20		20
Ownership	[1]	0.26%		0.26%
Acquisition Cost	[1]	₩ 4		₩ 4
Book value	[1]	4		4
Fair value	[1]	₩ 4		₩ 4
Bellie Doughnuts Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	169		169
Ownership	[1]	0.19%		0.19%
Acquisition Cost	[1]	₩ 10		₩ 10
Book value	[1]	10		10
Fair value	[1]	₩ 10		₩ 10
AIRTECH Information communication Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	2,379		2,379
Ownership	[1]	0.60%		0.60%
Acquisition Cost	[1]	₩ 12		₩ 12
Book value	[1]	12		12
Fair value	[1]	₩ 12		₩ 12
Kiscom Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,493		1,493
Ownership	[1]	0.04%		0.04%
Acquisition Cost	[1]	₩ 1		₩ 1
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
Wonil laser Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			157
Ownership	[1]			0.37%
Acquisition Cost	[1]			₩ 16
Book value	[1]			16
Fair value	[1]			₩ 16
Pyung Hwa Industrial Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			3,388
Ownership	[1]			3%
Acquisition Cost	[1]			₩ 85
Book value	[1]			85
Fair value	[1]			₩ 85
Set Holding
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,100,220	[2]	1,100,220	[3]
Ownership	[1]	2.50%	[2]	2.50%	[3]
Acquisition Cost	[1]	₩ 229,255	[2]	₩ 229,255	[3]
Book value	[1]	163,580	[2]	131,036	[3]
Fair value	[1]	₩ 163,580	[2]	₩ 131,036	[3]
PT. Cirebon Energi Prasarana
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			22,420
Ownership	[1]			10%
Acquisition Cost	[1]			₩ 2,612
Book value	[1]			2,658
Fair value	[1]			₩ 2,658
Choheung packing Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	61		61
Ownership	[1]	0.13%		0.13%
Acquisition Cost	[1]	₩ 12		₩ 12
Book value	[1]	12		12
Fair value	[1]	₩ 12		₩ 12
Jaewoo Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	359		359
Ownership	[1]	0.24%		0.24%
Acquisition Cost	[1]	₩ 11		₩ 11
Book value	[1]	11		11
Fair value	[1]	₩ 11		₩ 11
Wooyang HC Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,375		1,375
Ownership	[1]	0.01%		0.01%
Acquisition Cost	[1]	₩ 159		₩ 159
Book value	[1]	13		13
Fair value	[1]	₩ 13		₩ 13
TheYeonriji Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	116		116
Ownership	[1]	0.10%		0.10%
Acquisition Cost	[1]	₩ 6		₩ 6
Book value	[1]	6		6
Fair value	[1]	₩ 6		₩ 6
Flusys Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	9		9
Ownership	[1]	0.08%		0.08%
Acquisition Cost	[1]	₩ 2		₩ 2
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
DongSeo Electronics Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	347		347
Ownership	[1]	0.07%		0.07%
Acquisition Cost	[1]	₩ 17		₩ 16
Book value	[1]	17		17
Fair value	[1]	₩ 17		₩ 17
Daewoo Display Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	177		177
Ownership	[1]	0.03%		0.03%
Acquisition Cost	[1]	₩ 5		₩ 5
Book value	[1]	5		5
Fair value	[1]	₩ 5		₩ 5
NTS Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	143		143
Ownership	[1]	0.22%		0.22%
Acquisition Cost	[1]	₩ 36		₩ 36
Book value	[1]	36		36
Fair value	[1]	₩ 36		₩ 36
AID CO., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,212		1,212
Ownership	[1]	0.57%		0.57%
Acquisition Cost	[1]	₩ 36		₩ 36
Book value	[1]	36		36
Fair value	[1]	₩ 36		₩ 36
Changwon Eco-friendly farming corp
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	3		3
Ownership	[1]	0.01%		0.01%
Acquisition Cost	[1]	₩ 0		₩ 0
Book value	[1]	0		0
Fair value	[1]	₩ 0		₩ 0
Kumo Hitech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	6,697		6,697
Ownership	[1]	0.53%		0.53%
Acquisition Cost	[1]	₩ 100		₩ 100
Book value	[1]	32		32
Fair value	[1]	₩ 32		₩ 32
Kyung Pyo Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	186		186
Ownership	[1]	0.76%		0.76%
Acquisition Cost	[1]	₩ 19		₩ 19
Book value	[1]	19		19
Fair value	[1]	₩ 19		₩ 19
Daedong Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	53		617
Ownership	[1]	0.06%		0.55%
Acquisition Cost	[1]	₩ 5		₩ 46
Book value	[1]	5		46
Fair value	[1]	₩ 5		₩ 46
Doosung Heavy Industries Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			53
Ownership	[1]			0.06%
Acquisition Cost	[1]			₩ 5
Book value	[1]			5
Fair value	[1]			₩ 5
Samjoo Hightech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	522		522
Ownership	[1]	0.08%		0.08%
Acquisition Cost	[1]	₩ 3		₩ 3
Book value	[1]	3		3
Fair value	[1]	₩ 3		₩ 3
Samkwang Chemical Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	204		204
Ownership	[1]	1.27%		1.27%
Acquisition Cost	[1]	₩ 51		₩ 51
Book value	[1]	51		51
Fair value	[1]	₩ 51		₩ 51
SG Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			213
Ownership	[1]			0.54%
Acquisition Cost	[1]			₩ 21
Book value	[1]			21
Fair value	[1]			₩ 21
Shinseung Chemical Industy Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	5		5
Ownership	[1]	0.01%		0.01%
Acquisition Cost	[1]	₩ 60		₩ 60
Book value	[1]	0		60
Fair value	[1]	₩ 0		₩ 60
KJ Alloy Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	368		368
Ownership	[1]	0.20%		0.20%
Acquisition Cost	[1]	₩ 7		₩ 7
Book value	[1]	7		7
Fair value	[1]	₩ 7		₩ 7
SM Hi-tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	22		22
Ownership	[1]	0.39%		0.39%
Acquisition Cost	[1]	₩ 22		₩ 22
Book value	[1]	22		22
Fair value	[1]	₩ 22		₩ 22
Puruen Environment Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	967		967
Ownership	[1]	1.34%		1.34%
Acquisition Cost	[1]	₩ 19		₩ 19
Book value	[1]	19		19
Fair value	[1]	₩ 19		₩ 19
Miretech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	9,111		9,111
Ownership	[1]	0.27%		0.27%
Acquisition Cost	[1]	₩ 18		₩ 18
Book value	[1]	18		18
Fair value	[1]	₩ 18		₩ 18
Sejin Hightech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	17,980		17,980
Ownership	[1]	0.16%		0.16%
Acquisition Cost	[1]	₩ 18		₩ 18
Book value	[1]	18		18
Fair value	[1]	₩ 18		₩ 18
Eun Sung Enterprise Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,131		1,131
Ownership	[1]	0.72%		0.72%
Acquisition Cost	[1]	₩ 17		₩ 17
Book value	[1]	17		17
Fair value	[1]	₩ 17		₩ 17
Dongdo Basalt Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			182
Ownership	[1]			1.50%
Acquisition Cost	[1]			₩ 73
Book value	[1]			73
Fair value	[1]			₩ 73
Shinyoung Textiles Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	523		523
Ownership	[1]	1.01%		1.01%
Acquisition Cost	[1]	₩ 52		₩ 52
Book value	[1]	23		23
Fair value	[1]	₩ 23		₩ 23
Ilwoo Steel Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	41		41
Ownership	[1]	0.28%		0.28%
Acquisition Cost	[1]	₩ 17		₩ 17
Book value	[1]	17		17
Fair value	[1]	₩ 17		₩ 17
Dong-un Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,159		1,159
Ownership	[1]	6.28%		6.28%
Acquisition Cost	[1]	₩ 81		₩ 81
Book value	[1]	34		81
Fair value	[1]	₩ 34		₩ 81
Wongwang Door Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	575		575
Ownership	[1]	1%		1%
Acquisition Cost	[1]	₩ 29		₩ 29
Book value	[1]	29		29
Fair value	[1]	₩ 29		₩ 29
Mansu Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	344		344
Ownership	[1]	0.25%		0.25%
Acquisition Cost	[1]	₩ 15		₩ 15
Book value	[1]	15		15
Fair value	[1]	₩ 15		₩ 15
Eanskorea Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	39		39
Ownership	[1]	0.05%		0.05%
Acquisition Cost	[1]	₩ 2		₩ 2
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
Youngdongseafood Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	165		165
Ownership	[1]	0.33%		0.33%
Acquisition Cost	[1]	₩ 8		₩ 8
Book value	[1]	8		8
Fair value	[1]	₩ 8		₩ 8
Hyunwoo Winstar Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1		1
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 0		₩ 0
Book value	[1]	0		0
Fair value	[1]	₩ 0		₩ 0
Sehwa Diecasting Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			299
Ownership	[1]			1.66%
Acquisition Cost	[1]			₩ 44
Book value	[1]			44
Fair value	[1]			₩ 44
Sungchang Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	159		159
Ownership	[1]	0.31%		0.31%
Acquisition Cost	[1]	₩ 19		₩ 10
Book value	[1]	19		10
Fair value	[1]	₩ 19		₩ 10
Yuchang Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	90		90
Ownership	[1]	0.11%		0.11%
Acquisition Cost	[1]	₩ 5		₩ 5
Book value	[1]	5		5
Fair value	[1]	₩ 5		₩ 5
Jeongpum Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	322		322
Ownership	[1]	0.35%		0.35%
Acquisition Cost	[1]	₩ 16		₩ 16
Book value	[1]	16		16
Fair value	[1]	₩ 16		₩ 16
Korea Steel Power Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	2,761		2,761
Ownership	[1]	1.88%		1.88%
Acquisition Cost	[1]	₩ 55		₩ 55
Book value	[1]	2		55
Fair value	[1]	₩ 2		₩ 55
Amanex Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	10		10
Ownership	[1]	0.02%		0.02%
Acquisition Cost	[1]	₩ 9		₩ 9
Book value	[1]	9		9
Fair value	[1]	₩ 9		₩ 9
Dae-A Leisure Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	23		23
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 4		₩ 4
Book value	[1]	4		4
Fair value	[1]	₩ 4		₩ 4
Caffe Bene Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,908		1,908
Ownership	[1]	0.03%		0.03%
Acquisition Cost	[1]	₩ 9		₩ 9
Book value	[1]	9		9
Fair value	[1]	₩ 9		₩ 9
Shinjin International Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	4		4
Ownership	[1]	0.01%		0.01%
Acquisition Cost	[1]	₩ 1		₩ 1
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
Jinhung Packaging Co.,Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	4,329		4,329
Ownership	[1]	3.02%		3.02%
Acquisition Cost	[1]	₩ 22		₩ 22
Book value	[1]	22		22
Fair value	[1]	₩ 22		₩ 22
Donglim Eng Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	26		26
Ownership	[1]	0.11%		0.11%
Acquisition Cost	[1]	₩ 3		₩ 3
Book value	[1]	3		3
Fair value	[1]	₩ 3		₩ 3
SIP Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	274		274
Ownership	[1]	0.55%		0.55%
Acquisition Cost	[1]	₩ 7		₩ 7
Book value	[1]	7		7
Fair value	[1]	₩ 7		₩ 7
Clizen Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	615		615
Ownership	[1]	0.34%		0.34%
Acquisition Cost	[1]	₩ 31		₩ 31
Book value	[1]	31		31
Fair value	[1]	₩ 31		₩ 31
DAEDONGMILLENNIUM Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			159
Ownership	[1]			0.42%
Acquisition Cost	[1]			₩ 32
Book value	[1]			32
Fair value	[1]			₩ 32
Daeji Product Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	15		15
Ownership	[1]	0.05%		0.05%
Acquisition Cost	[1]	₩ 1		₩ 1
Book value	[1]	0		0
Fair value	[1]	₩ 0		₩ 0
Jaein Circuit Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			498
Ownership	[1]			1.12%
Acquisition Cost	[1]			₩ 65
Book value	[1]			65
Fair value	[1]			₩ 65
SSET Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	181		181
Ownership	[1]	0.30%		0.30%
Acquisition Cost	[1]	₩ 18		₩ 18
Book value	[1]	18		18
Fair value	[1]	₩ 18		₩ 18
Sewon PM Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	963		963
Ownership	[1]	1.11%		1.11%
Acquisition Cost	[1]	₩ 48		₩ 48
Book value	[1]	48		48
Fair value	[1]	₩ 48		₩ 48
Dawon Yuhwa Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	506		506
Ownership	[1]	1.94%		1.94%
Acquisition Cost	[1]	₩ 25		₩ 25
Book value	[1]	25		25
Fair value	[1]	₩ 25		₩ 25
Ogokbaekkwa Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	101		101
Ownership	[1]	0.12%		0.12%
Acquisition Cost	[1]	₩ 1		₩ 1
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
Shinwoo Toptech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	834		834
Ownership	[1]	0.51%		0.51%
Acquisition Cost	[1]	₩ 83		₩ 83
Book value	[1]	6		6
Fair value	[1]	₩ 6		₩ 6
KMLC Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	281		281
Ownership	[1]	0.14%		0.14%
Acquisition Cost	[1]	₩ 22		₩ 22
Book value	[1]	22		22
Fair value	[1]	₩ 22		₩ 22
Seinfood Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	13		13
Ownership	[1]	0.17%		0.17%
Acquisition Cost	[1]	₩ 7		₩ 7
Book value	[1]	7		7
Fair value	[1]	₩ 7		₩ 7
TaeSung Eco-Tech. Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,368		1,368
Ownership	[1]	4.55%		4.55%
Acquisition Cost	[1]	₩ 34		₩ 34
Book value	[1]	34		34
Fair value	[1]	₩ 34		₩ 34
Kukex Inc.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	639		639
Ownership	[1]	0.05%		0.05%
Acquisition Cost	[1]	₩ 3		₩ 3
Book value	[1]	3		3
Fair value	[1]	₩ 3		₩ 3
Youngshin Plus Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	104		104
Ownership	[1]	0.12%		0.12%
Acquisition Cost	[1]	₩ 5		₩ 5
Book value	[1]	5		5
Fair value	[1]	₩ 5		₩ 5
Chang won Engineering Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	22		22
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 4		₩ 4
Book value	[1]	4		4
Fair value	[1]	₩ 4		₩ 4
Samsung Silup Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	47		47
Ownership	[1]	0.19%		0.19%
Acquisition Cost	[1]	₩ 5		₩ 5
Book value	[1]	5		5
Fair value	[1]	₩ 5		₩ 5
Samwon Bio Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	390		390
Ownership	[1]	0.25%		0.25%
Acquisition Cost	[1]	₩ 6		₩ 6
Book value	[1]	6		6
Fair value	[1]	₩ 6		₩ 6
IZU KOREA Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	48		48
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 2		₩ 2
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
Dongdo CNP Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	234		234
Ownership	[1]	0.36%		0.36%
Acquisition Cost	[1]	₩ 6		₩ 6
Book value	[1]	6		6
Fair value	[1]	₩ 6		₩ 6
Dae Bang Industry Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	115		115
Ownership	[1]	0.13%		0.13%
Acquisition Cost	[1]	₩ 6		₩ 6
Book value	[1]	6		6
Fair value	[1]	₩ 6		₩ 6
S.I.T. Co.,Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	2,213		2,213
Ownership	[1]	0.44%		0.44%
Acquisition Cost	[1]	₩ 22		₩ 22
Book value	[1]	22		22
Fair value	[1]	₩ 22		₩ 22
Taejin Hiech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	78		78
Ownership	[1]	0.26%		0.26%
Acquisition Cost	[1]	₩ 3		₩ 3
Book value	[1]	3		3
Fair value	[1]	₩ 3		₩ 3
Headone Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	69		69
Ownership	[1]	0.12%		0.12%
Acquisition Cost	[1]	₩ 7		₩ 7
Book value	[1]	7		7
Fair value	[1]	₩ 7		₩ 7
E-Won Solutech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	158		158
Ownership	[1]	0.16%		0.16%
Acquisition Cost	[1]	₩ 40		₩ 40
Book value	[1]	40		40
Fair value	[1]	₩ 40		₩ 40
MJT Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			1,013
Ownership	[1]			0.20%
Acquisition Cost	[1]			₩ 51
Book value	[1]			51
Fair value	[1]			₩ 51
KPL Circuit Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	283		283
Ownership	[1]	0.08%		0.08%
Acquisition Cost	[1]	₩ 14		₩ 14
Book value	[1]	14		14
Fair value	[1]	₩ 14		₩ 14
Road Solar Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	12		12
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 0		₩ 0
Book value	[1]	0		0
Fair value	[1]	₩ 0		₩ 0
Han Mi Flexible Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	143		143
Ownership	[1]	0.20%		0.20%
Acquisition Cost	[1]	₩ 43		₩ 43
Book value	[1]	43		43
Fair value	[1]	₩ 43		₩ 43
Samhwa Casting Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			200
Ownership	[1]			0.04%
Acquisition Cost	[1]			₩ 100
Book value	[1]			100
Fair value	[1]			₩ 100
Millennium PNT Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	227		227
Ownership	[1]	0.37%		0.37%
Acquisition Cost	[1]	₩ 6		₩ 6
Book value	[1]	6		6
Fair value	[1]	₩ 6		₩ 6
GN Chem Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	40		40
Ownership	[1]	0.07%		0.07%
Acquisition Cost	[1]	₩ 1		₩ 1
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
GW Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			505
Ownership	[1]			0.07%
Acquisition Cost	[1]			₩ 51
Book value	[1]			51
Fair value	[1]			₩ 51
TM Construction co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			4
Ownership	[1]			0%
Acquisition Cost	[1]			₩ 0
Book value	[1]			0
Fair value	[1]			₩ 0
Dae Myung Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	114		114
Ownership	[1]	0.08%		0.08%
Acquisition Cost	[1]	₩ 3		₩ 3
Book value	[1]	3		3
Fair value	[1]	₩ 3		₩ 3
Nanomicart Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	176		176
Ownership	[1]	1.06%		1.06%
Acquisition Cost	[1]	₩ 35		₩ 35
Book value	[1]	35		35
Fair value	[1]	₩ 35		₩ 35
Young San Heavy Industries Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	74		74
Ownership	[1]	0.11%		0.11%
Acquisition Cost	[1]	₩ 7		₩ 7
Book value	[1]	7		7
Fair value	[1]	₩ 7		₩ 7
Samchungwon Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	15		15
Ownership	[1]	0.24%		0.24%
Acquisition Cost	[1]	₩ 2		₩ 2
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
Wooyang Frozen Foods Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	66		66
Ownership	[1]	0.82%		0.82%
Acquisition Cost	[1]	₩ 27		₩ 27
Book value	[1]	27		27
Fair value	[1]	₩ 27		₩ 27
Nanomic Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	94		94
Ownership	[1]	0.63%		0.63%
Acquisition Cost	[1]	₩ 38		₩ 38
Book value	[1]	38		38
Fair value	[1]	₩ 38		₩ 38
Samsung Nonferrous Metal Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	89		89
Ownership	[1]	0.26%		0.26%
Acquisition Cost	[1]	₩ 9		₩ 9
Book value	[1]	9		9
Fair value	[1]	₩ 9		₩ 9
Daewha Fuel Pump Ind., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	83		83
Ownership	[1]	0.05%		0.05%
Acquisition Cost	[1]	₩ 10		₩ 10
Book value	[1]	10		10
Fair value	[1]	₩ 10		₩ 10
Addies Direct Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1		1
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 0		₩ 0
Book value	[1]	0		0
Fair value	[1]	₩ 0		₩ 0
WorldCnM Inc.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	131		131
Ownership	[1]	1.09%		1.09%
Acquisition Cost	[1]	₩ 10		₩ 10
Book value	[1]	10		10
Fair value	[1]	₩ 10		₩ 10
Superone Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,585		1,585
Ownership	[1]	1.45%		1.45%
Acquisition Cost	[1]	₩ 8		₩ 8
Book value	[1]	8		8
Fair value	[1]	₩ 8		₩ 8
Buyoung Panji Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	478		478
Ownership	[1]	0.44%		0.44%
Acquisition Cost	[1]	₩ 12		₩ 12
Book value	[1]	12		12
Fair value	[1]	₩ 12		₩ 12
International Paint Korea Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	111		111
Ownership	[1]	0.48%		0.48%
Acquisition Cost	[1]	₩ 11		₩ 11
Book value	[1]	11		11
Fair value	[1]	₩ 11		₩ 11
EI Lighting Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	358		358
Ownership	[1]	0.36%		0.36%
Acquisition Cost	[1]	₩ 18		₩ 18
Book value	[1]	18		18
Fair value	[1]	₩ 18		₩ 18
Hightech Mnp Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	123		123
Ownership	[1]	0.35%		0.35%
Acquisition Cost	[1]	₩ 6		₩ 6
Book value	[1]	6		6
Fair value	[1]	₩ 6		₩ 6
Yooseung Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	10		10
Ownership	[1]	0.08%		0.08%
Acquisition Cost	[1]	₩ 1		₩ 1
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
Sungkwang Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	48		48
Ownership	[1]	0.35%		0.35%
Acquisition Cost	[1]	₩ 2		₩ 2
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
Taeyang gasteel Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	8		8
Ownership	[1]	0.02%		0.02%
Acquisition Cost	[1]	₩ 1		₩ 1
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
Ajin KSB Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	204		204
Ownership	[1]	0.31%		0.31%
Acquisition Cost	[1]	₩ 18		₩ 18
Book value	[1]	18		18
Fair value	[1]	₩ 18		₩ 18
Sewon Ceramic Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	530		530
Ownership	[1]	1.01%		1.01%
Acquisition Cost	[1]	₩ 5		₩ 5
Book value	[1]	5		5
Fair value	[1]	₩ 5		₩ 5
Choyang Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	465		465
Ownership	[1]	1.01%		1.01%
Acquisition Cost	[1]	₩ 23		₩ 23
Book value	[1]	23		23
Fair value	[1]	₩ 23		₩ 23
TK Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	307		307
Ownership	[1]	0.70%		0.70%
Acquisition Cost	[1]	₩ 15		₩ 15
Book value	[1]	15		15
Fair value	[1]	₩ 15		₩ 15
Arari Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	14		14
Ownership	[1]	0.05%		0.05%
Acquisition Cost	[1]	₩ 1		₩ 1
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
Potech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			39
Ownership	[1]			0.13%
Acquisition Cost	[1]			₩ 14
Book value	[1]			14
Fair value	[1]			₩ 14
C&S Corporation Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,304		1,304
Ownership	[1]	0.01%		0.01%
Acquisition Cost	[1]	₩ 13		₩ 13
Book value	[1]	13		13
Fair value	[1]	₩ 13		₩ 13
Global The One of Korea Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	62		62
Ownership	[1]	0.06%		0.06%
Acquisition Cost	[1]	₩ 3		₩ 3
Book value	[1]	3		3
Fair value	[1]	₩ 3		₩ 3
Steellife Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	85		85
Ownership	[1]	0.06%		0.06%
Acquisition Cost	[1]	₩ 4		₩ 4
Book value	[1]	4		4
Fair value	[1]	₩ 4		₩ 4
D&C Castech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	330		330
Ownership	[1]	1.89%		1.89%
Acquisition Cost	[1]	₩ 25		₩ 25
Book value	[1]	25		25
Fair value	[1]	₩ 25		₩ 25
Geumhan Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	498		498
Ownership	[1]	0.24%		0.24%
Acquisition Cost	[1]	₩ 7		₩ 7
Book value	[1]	7		7
Fair value	[1]	₩ 7		₩ 7
Mokgan Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	5		5
Ownership	[1]	0.02%		0.02%
Acquisition Cost	[1]	₩ 1		₩ 1
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
Wenex Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	373		373
Ownership	[1]	0.53%		0.53%
Acquisition Cost	[1]	₩ 19		₩ 19
Book value	[1]	19		19
Fair value	[1]	₩ 19		₩ 19
Sulim Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	30		30
Ownership	[1]	0.20%		0.20%
Acquisition Cost	[1]	₩ 6		₩ 6
Book value	[1]	6		6
Fair value	[1]	₩ 6		₩ 6
Shinkwang Engineering
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	24		24
Ownership	[1]	0.36%		0.36%
Acquisition Cost	[1]	₩ 2		₩ 2
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
Ek Cookware Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	60		60
Ownership	[1]	0.04%		0.04%
Acquisition Cost	[1]	₩ 1		₩ 1
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
KTTW Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	28		28
Ownership	[1]	0.05%		0.05%
Acquisition Cost	[1]	₩ 2		₩ 2
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
Avajar Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,061		1,061
Ownership	[1]	0.01%		0.01%
Acquisition Cost	[1]	₩ 1		₩ 1
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
Woosung I.B. Co.,Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	7,071		7,071
Ownership	[1]	0.07%		0.07%
Acquisition Cost	[1]	₩ 14		₩ 14
Book value	[1]	14		14
Fair value	[1]	₩ 14		₩ 14
CAP Korea Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	16		16
Ownership	[1]	0.30%		0.30%
Acquisition Cost	[1]	₩ 3		₩ 3
Book value	[1]	3		3
Fair value	[1]	₩ 3		₩ 3
MSM Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	25		25
Ownership	[1]	0.08%		0.08%
Acquisition Cost	[1]	₩ 0		₩ 0
Book value	[1]	0		0
Fair value	[1]	₩ 0		₩ 0
Ddpopstyle Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	22		22
Ownership	[1]	0.14%		0.14%
Acquisition Cost	[1]	₩ 1		₩ 0
Book value	[1]	1		0
Fair value	[1]	₩ 1		₩ 0
Finemetal Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	49		49
Ownership	[1]	0.08%		0.08%
Acquisition Cost	[1]	₩ 1		₩ 1
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
Sungkyeong Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	52		52
Ownership	[1]	0.24%		0.24%
Acquisition Cost	[1]	₩ 2		₩ 2
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
RMK Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	63		63
Ownership	[1]	0.90%		0.90%
Acquisition Cost	[1]	₩ 22		₩ 22
Book value	[1]	22		22
Fair value	[1]	₩ 22		₩ 22
Tpp Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			36,645
Ownership	[1]			11.72%
Acquisition Cost	[1]			₩ 1,832
Book value	[1]			1,832
Fair value	[1]			₩ 1,832
Dukeong Metal Heat Treatment Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			843
Ownership	[1]			3.61%
Acquisition Cost	[1]			₩ 84
Book value	[1]			84
Fair value	[1]			₩ 84
Newko Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	331		331
Ownership	[1]	0.06%		0.06%
Acquisition Cost	[1]	₩ 10		₩ 10
Book value	[1]	10		10
Fair value	[1]	₩ 10		₩ 10
KMC&R Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			16
Ownership	[1]			0.11%
Acquisition Cost	[1]			₩ 1
Book value	[1]			1
Fair value	[1]			₩ 1
Dongsung Mulsan Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	137		137
Ownership	[1]	0.34%		0.34%
Acquisition Cost	[1]	₩ 14		₩ 14
Book value	[1]	14		14
Fair value	[1]	₩ 14		₩ 14
Pizzakorea Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	42		42
Ownership	[1]	0.18%		0.18%
Acquisition Cost	[1]	₩ 9		₩ 9
Book value	[1]	9		9
Fair value	[1]	₩ 9		₩ 9
Geumdani Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	2,377		2,377
Ownership	[1]	1.82%		1.82%
Acquisition Cost	[1]	₩ 36		₩ 36
Book value	[1]	36		36
Fair value	[1]	₩ 36		₩ 36
Mezzanine I-pack Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	38		38
Ownership	[1]	0.02%		0.02%
Acquisition Cost	[1]	₩ 1		₩ 1
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
Ltop Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	36		36
Ownership	[1]	0.06%		0.06%
Acquisition Cost	[1]	₩ 7		₩ 7
Book value	[1]	7		7
Fair value	[1]	₩ 7		₩ 7
Simile Aluminium Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	428		428
Ownership	[1]	0.31%		0.31%
Acquisition Cost	[1]	₩ 9		₩ 9
Book value	[1]	9		9
Fair value	[1]	₩ 9		₩ 9
GT Tooling Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	604		604
Ownership	[1]	0.17%		0.17%
Acquisition Cost	[1]	₩ 6		₩ 6
Book value	[1]	6		6
Fair value	[1]	₩ 6		₩ 6
Panax Korea Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			4,782
Ownership	[1]			0.37%
Acquisition Cost	[1]			₩ 24
Book value	[1]			24
Fair value	[1]			₩ 24
Team Korea Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	4,782
Ownership	[1]	0.37%
Acquisition Cost	[1]	₩ 24
Book value	[1]	24
Fair value	[1]	₩ 24
Donghwa TCA Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,012		1,012
Ownership	[1]	0.30%		0.30%
Acquisition Cost	[1]	₩ 25		₩ 25
Book value	[1]	25		25
Fair value	[1]	₩ 25		₩ 25
Hankook Piaget Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	4		4
Ownership	[1]	0.01%		0.01%
Acquisition Cost	[1]	₩ 1		₩ 1
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
Coco Food Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	648		648
Ownership	[1]	1.24%		1.24%
Acquisition Cost	[1]	₩ 33		₩ 33
Book value	[1]	33		33
Fair value	[1]	₩ 33		₩ 33
Woori Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	102		102
Ownership	[1]	1.05%		1.05%
Acquisition Cost	[1]	₩ 21		₩ 21
Book value	[1]	21		21
Fair value	[1]	₩ 21		₩ 21
Ssangyong Youngweol Plant Service&Engineering Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	83		83
Ownership	[1]	0.07%		0.07%
Acquisition Cost	[1]	₩ 4		₩ 4
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
SH Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	39		39
Ownership	[1]	0.20%		0.20%
Acquisition Cost	[1]	₩ 8		₩ 8
Book value	[1]	8		8
Fair value	[1]	₩ 8		₩ 8
Namsunnam Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			1,275
Ownership	[1]			0.19%
Acquisition Cost	[1]			₩ 6
Book value	[1]			1
Fair value	[1]			₩ 1
Daeyoung Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	75		75
Ownership	[1]	0.01%		0.01%
Acquisition Cost	[1]	₩ 8		₩ 8
Book value	[1]	8		8
Fair value	[1]	₩ 8		₩ 8
Chandown Food Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	46		46
Ownership	[1]	0.14%		0.14%
Acquisition Cost	[1]	₩ 9		₩ 9
Book value	[1]	9		9
Fair value	[1]	₩ 9		₩ 9
Getron Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	7,259		7,259
Ownership	[1]	0.20%		0.20%
Acquisition Cost	[1]	₩ 37		₩ 37
Book value	[1]	4		4
Fair value	[1]	₩ 4		₩ 4
Jungmun Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	19		19
Ownership	[1]	0.26%		0.26%
Acquisition Cost	[1]	₩ 2		₩ 2
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
Andong Trading Corporation Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	42		42
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 2		₩ 2
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
JM Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	403		403
Ownership	[1]	0.67%		0.67%
Acquisition Cost	[1]	₩ 82		₩ 82
Book value	[1]	10		10
Fair value	[1]	₩ 10		₩ 10
SGC Energy Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	580,000		580,000
Ownership	[1]	5%		5%
Acquisition Cost	[1]	₩ 2,900		₩ 2,900
Book value	[1]	7,856		2,900
Fair value	[1]	₩ 7,856		₩ 2,900
Le Soleil KHNP LLC
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	137,600		137,600
Ownership	[1]	19%		19%
Acquisition Cost	[1]	₩ 1,376		₩ 1,376
Book value	[1]	1,376		1,376
Fair value	[1]	₩ 1,376		₩ 1,376
Ihsung CNI Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	127,660		127,660
Ownership	[1]	4.30%		4.30%
Acquisition Cost	[1]	₩ 1,500		₩ 1,500
Book value	[1]	2,016		2,618
Fair value	[1]	₩ 2,016		₩ 2,618
H Robotics Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	903,601		903,601
Ownership	[1]	8.05%		8.05%
Acquisition Cost	[1]	₩ 4,000		₩ 4,000
Book value	[1]	5,638		5,639
Fair value	[1]	₩ 5,638		₩ 5,639
Good Tcells Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	11,364		11,364
Ownership	[1]	0.34%		0.34%
Acquisition Cost	[1]	₩ 500		₩ 500
Book value	[1]	347		457
Fair value	[1]	₩ 347		₩ 457
IPS Bio Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,975		1,975
Ownership	[1]	3.13%		3.13%
Acquisition Cost	[1]	₩ 1,000		₩ 1,000
Book value	[1]	843		1,000
Fair value	[1]	₩ 843		₩ 1,000
Nine B Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	5,000		5,000
Ownership	[1]	4.96%		4.96%
Acquisition Cost	[1]	₩ 1,000		₩ 1,000
Book value	[1]	1,000		1,000
Fair value	[1]	₩ 1,000		₩ 1,000
Choigang-gujo Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	61		61
Ownership	[1]	0.45%		0.45%
Acquisition Cost	[1]	₩ 6		₩ 6
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
DS Cotec Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			973
Ownership	[1]			0.71%
Acquisition Cost	[1]			₩ 15
Book value	[1]			5
Fair value	[1]			₩ 5
Youngheung Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	101		101
Ownership	[1]	0.05%		0.05%
Acquisition Cost	[1]	₩ 5		₩ 5
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
Hosungsteel Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	323		323
Ownership	[1]	0.26%		0.26%
Acquisition Cost	[1]	₩ 14		₩ 14
Book value	[1]	3		3
Fair value	[1]	₩ 3		₩ 3
Uktae IND. Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	140		140
Ownership	[1]	0.12%		0.12%
Acquisition Cost	[1]	₩ 7		₩ 7
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
Gangdong R&S Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			69
Ownership	[1]			1.25%
Acquisition Cost	[1]			₩ 1
Book value	[1]			1
Fair value	[1]			₩ 1
JFC Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	16		16
Ownership	[1]	0.01%		0.01%
Acquisition Cost	[1]	₩ 2		₩ 2
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
Seokjin E&T Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			81
Ownership	[1]			0.06%
Acquisition Cost	[1]			₩ 8
Book value	[1]			8
Fair value	[1]			₩ 8
Hyundai Tech Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	28		28
Ownership	[1]	0.69%		0.69%
Acquisition Cost	[1]	₩ 10		₩ 10
Book value	[1]	10		10
Fair value	[1]	₩ 10		₩ 10
Daeil Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	301		301
Ownership	[1]	0.42%		0.42%
Acquisition Cost	[1]	₩ 15		₩ 15
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
Seohan Food Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	83		83
Ownership	[1]	0.19%		0.19%
Acquisition Cost	[1]	₩ 2		₩ 2
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
Daehyeon Recycle Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	59		59
Ownership	[1]	0.61%		0.61%
Acquisition Cost	[1]	₩ 12		₩ 12
Book value	[1]	12		12
Fair value	[1]	₩ 12		₩ 12
Metal Link Inc. Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	709		709
Ownership	[1]	0.17%		0.17%
Acquisition Cost	[1]	₩ 35		₩ 35
Book value	[1]	4		4
Fair value	[1]	₩ 4		₩ 4
Pipetec Korea Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	50		50
Ownership	[1]	0.07%		0.07%
Acquisition Cost	[1]	₩ 10		₩ 10
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
SungJin Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	803		803
Ownership	[1]	1.20%		1.20%
Acquisition Cost	[1]	₩ 24		₩ 24
Book value	[1]	8		8
Fair value	[1]	₩ 8		₩ 8
Yujin E&C Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	29		29
Ownership	[1]	0.18%		0.18%
Acquisition Cost	[1]	₩ 6		₩ 6
Book value	[1]	0		0
Fair value	[1]	₩ 0		₩ 0
Daishin Logistics Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	13		13
Ownership	[1]	0.09%		0.09%
Acquisition Cost	[1]	₩ 1		₩ 1
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
JinSung Engineering Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	18		18
Ownership	[1]	0.30%		0.30%
Acquisition Cost	[1]	₩ 18		₩ 18
Book value	[1]	18		18
Fair value	[1]	₩ 18		₩ 18
Yongho Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	157		157
Ownership	[1]	0.22%		0.22%
Acquisition Cost	[1]	₩ 32		₩ 32
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
Wow tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	369		369
Ownership	[1]	0.75%		0.75%
Acquisition Cost	[1]	₩ 11		₩ 11
Book value	[1]	11		11
Fair value	[1]	₩ 11		₩ 11
World Power Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	16		16
Ownership	[1]	0.28%		0.28%
Acquisition Cost	[1]	₩ 24		₩ 24
Book value	[1]	24		24
Fair value	[1]	₩ 24		₩ 24
PBM Auto Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,001		1,001
Ownership	[1]	1.06%		1.06%
Acquisition Cost	[1]	₩ 10		₩ 10
Book value	[1]	10		10
Fair value	[1]	₩ 10		₩ 10
K2 Motors Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	54		54
Ownership	[1]	0.28%		0.28%
Acquisition Cost	[1]	₩ 1		₩ 1
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
CL Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	801		801
Ownership	[1]	2.25%		2.25%
Acquisition Cost	[1]	₩ 40		₩ 40
Book value	[1]	40		40
Fair value	[1]	₩ 40		₩ 40
Mirae Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	39		39
Ownership	[1]	0.04%		0.04%
Acquisition Cost	[1]	₩ 6		₩ 6
Book value	[1]	6		6
Fair value	[1]	₩ 6		₩ 6
Gentak Korea Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	301		301
Ownership	[1]	0.31%		0.31%
Acquisition Cost	[1]	₩ 8		₩ 8
Book value	[1]	8		8
Fair value	[1]	₩ 8		₩ 8
Sungjin Chemical Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	118		118
Ownership	[1]	0.36%		0.36%
Acquisition Cost	[1]	₩ 4		₩ 4
Book value	[1]	4		4
Fair value	[1]	₩ 4		₩ 4
LMAT Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	198		198
Ownership	[1]	0.04%		0.04%
Acquisition Cost	[1]	₩ 20		₩ 20
Book value	[1]	20		20
Fair value	[1]	₩ 20		₩ 20
Poong Lim Industrial Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	25		25
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 38		₩ 38
Book value	[1]	38		38
Fair value	[1]	₩ 38		₩ 38
Dae Sung GeoTech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	631		631
Ownership	[1]	1.28%		1.28%
Acquisition Cost	[1]	₩ 32		₩ 32
Book value	[1]	32		32
Fair value	[1]	₩ 32		₩ 32
Saeheemang Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	756		756
Ownership	[1]	0.60%		0.60%
Acquisition Cost	[1]	₩ 15		₩ 15
Book value	[1]	15		15
Fair value	[1]	₩ 15		₩ 15
Hakbong Precision Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,460		1,460
Ownership	[1]	1.18%		1.18%
Acquisition Cost	[1]	₩ 15		₩ 15
Book value	[1]	15		15
Fair value	[1]	₩ 15		₩ 15
Vornech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	431		431
Ownership	[1]	0.37%		0.37%
Acquisition Cost	[1]	₩ 11		₩ 11
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
Woojin Formtech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	76		76
Ownership	[1]	0.08%		0.08%
Acquisition Cost	[1]	₩ 8		₩ 8
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
Korea Engineer Manufacturing Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	114		114
Ownership	[1]	0.26%		0.26%
Acquisition Cost	[1]	₩ 6		₩ 6
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
Sinwa J&K Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	476		476
Ownership	[1]	0.28%		0.28%
Acquisition Cost	[1]	₩ 5		₩ 5
Book value	[1]	5		5
Fair value	[1]	₩ 5		₩ 5
Owon E&G Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	132		132
Ownership	[1]	0.20%		0.20%
Acquisition Cost	[1]	₩ 4		₩ 4
Book value	[1]	4		4
Fair value	[1]	₩ 4		₩ 4
Guseong Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	141		141
Ownership	[1]	0.20%		0.20%
Acquisition Cost	[1]	₩ 3		₩ 4
Book value	[1]	3		4
Fair value	[1]	₩ 3		₩ 4
Irefarm Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	45		45
Ownership	[1]	0.30%		0.30%
Acquisition Cost	[1]	₩ 3		₩ 3
Book value	[1]	3		3
Fair value	[1]	₩ 3		₩ 3
Nam-hae E&C Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	117		117
Ownership	[1]	0.10%		0.10%
Acquisition Cost	[1]	₩ 2		₩ 2
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
Haenarae Agricultural Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	15		15
Ownership	[1]	0.03%		0.03%
Acquisition Cost	[1]	₩ 2		₩ 2
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
Ja Yeon Science Ind. Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			10
Ownership	[1]			0.05%
Acquisition Cost	[1]			₩ 2
Book value	[1]			2
Fair value	[1]			₩ 2
DECO&E Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,261		1,261
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 2		₩ 2
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
Design Beyond Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	17		17
Ownership	[1]	0.19%		0.19%
Acquisition Cost	[1]	₩ 2		₩ 2
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
LBK Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	8		8
Ownership	[1]	0.05%		0.05%
Acquisition Cost	[1]	₩ 1		₩ 1
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
Duckwon industrial Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	32		32
Ownership	[1]	0.43%		0.43%
Acquisition Cost	[1]	₩ 13		₩ 13
Book value	[1]	13		13
Fair value	[1]	₩ 13		₩ 13
ASPT Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	64		64
Ownership	[1]	0.82%		0.82%
Acquisition Cost	[1]	₩ 19		₩ 19
Book value	[1]	19		19
Fair value	[1]	₩ 19		₩ 19
SIMA Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	29		29
Ownership	[1]	0.05%		0.05%
Acquisition Cost	[1]	₩ 3		₩ 3
Book value	[1]	3		3
Fair value	[1]	₩ 3		₩ 3
Jingkang Resources Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	90		90
Ownership	[1]	1.57%		1.57%
Acquisition Cost	[1]	₩ 13		₩ 13
Book value	[1]	13		13
Fair value	[1]	₩ 13		₩ 13
Eslin Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	39		39
Ownership	[1]	0.14%		0.14%
Acquisition Cost	[1]	₩ 8		₩ 8
Book value	[1]	8		8
Fair value	[1]	₩ 8		₩ 8
Shinwon Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	275		275
Ownership	[1]	0.42%		0.42%
Acquisition Cost	[1]	₩ 19		₩ 19
Book value	[1]	19		19
Fair value	[1]	₩ 19		₩ 19
CIC Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	96		96
Ownership	[1]	0.54%		0.54%
Acquisition Cost	[1]	₩ 10		₩ 10
Book value	[1]	10		10
Fair value	[1]	₩ 10		₩ 10
Orano Expansion
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	5,742,405		5,742,405
Ownership	[1]	4.72%		4.72%
Acquisition Cost	[1]	₩ 0		₩ 0
Book value	[1]	0		0
Fair value	[1]	₩ 0		₩ 0
Fourever Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	44		44
Ownership	[1]	0.10%		0.10%
Acquisition Cost	[1]	₩ 4		₩ 4
Book value	[1]	4		4
Fair value	[1]	₩ 4		₩ 4
Segyo Hitech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			156
Ownership	[1]			0.24%
Acquisition Cost	[1]			₩ 8
Book value	[1]			8
Fair value	[1]			₩ 8
Myungil Metal Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	80		80
Ownership	[1]	0.10%		0.10%
Acquisition Cost	[1]	₩ 4		₩ 4
Book value	[1]	4		4
Fair value	[1]	₩ 4		₩ 4
Daeshin ECM Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	182		182
Ownership	[1]	0.30%		0.30%
Acquisition Cost	[1]	₩ 9		₩ 9
Book value	[1]	9		9
Fair value	[1]	₩ 9		₩ 9
Greencarbon Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	79		79
Ownership	[1]	0.06%		0.06%
Acquisition Cost	[1]	₩ 1		₩ 1
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
Sunkoo Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	4		4
Ownership	[1]	0.10%		0.10%
Acquisition Cost	[1]	₩ 2		₩ 2
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
Jians Construction Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	45		13
Ownership	[1]	0.01%		0%
Acquisition Cost	[1]	₩ 2		₩ 2
Book value	[1]	4		2
Fair value	[1]	₩ 4		₩ 2
DH trading Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	891		891
Ownership	[1]	0.04%		0.04%
Acquisition Cost	[1]	₩ 178		₩ 178
Book value	[1]	0		178
Fair value	[1]	₩ 0		₩ 178
Diotech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			2,186
Ownership	[1]			2.84%
Acquisition Cost	[1]			₩ 219
Book value	[1]			219
Fair value	[1]			₩ 219
Sangsin Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	29		29
Ownership	[1]	0.09%		0.09%
Acquisition Cost	[1]	₩ 15		₩ 15
Book value	[1]	15		15
Fair value	[1]	₩ 15		₩ 15
Steel focus Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	154		154
Ownership	[1]	0.20%		0.20%
Acquisition Cost	[1]	₩ 4		₩ 4
Book value	[1]	4		4
Fair value	[1]	₩ 4		₩ 4
Kamada Korea Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	437		437
Ownership	[1]	0.33%		0.33%
Acquisition Cost	[1]	₩ 22		₩ 22
Book value	[1]	22		22
Fair value	[1]	₩ 22		₩ 22
Fosys Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	19		19
Ownership	[1]	0.08%		0.08%
Acquisition Cost	[1]	₩ 4		₩ 4
Book value	[1]	4		4
Fair value	[1]	₩ 4		₩ 4
GB precision Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	137		137
Ownership	[1]	0.57%		0.57%
Acquisition Cost	[1]	₩ 1		₩ 1
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
Ewon Art Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	185		185
Ownership	[1]	0.61%		0.61%
Acquisition Cost	[1]	₩ 9		₩ 9
Book value	[1]	9		9
Fair value	[1]	₩ 9		₩ 9
DI Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	3		3
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 0		₩ 0
Book value	[1]	0		0
Fair value	[1]	₩ 0		₩ 0
Hans AD Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	33		33
Ownership	[1]	0.35%		0.35%
Acquisition Cost	[1]	₩ 2		₩ 2
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
Chaegim Environment Development Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	158		158
Ownership	[1]	0.01%		0.01%
Acquisition Cost	[1]	₩ 3		₩ 3
Book value	[1]	3		3
Fair value	[1]	₩ 3		₩ 3
Daesung Stain Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	32		32
Ownership	[1]	0.32%		0.32%
Acquisition Cost	[1]	₩ 2		₩ 2
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
YSM Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	281		281
Ownership	[1]	2.07%		2.07%
Acquisition Cost	[1]	₩ 14		₩ 14
Book value	[1]	14		14
Fair value	[1]	₩ 14		₩ 14
Dong In Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	65		65
Ownership	[1]	0.13%		0.13%
Acquisition Cost	[1]	₩ 3		₩ 3
Book value	[1]	3		3
Fair value	[1]	₩ 3		₩ 3
U&I Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	50		50
Ownership	[1]	0.22%		0.22%
Acquisition Cost	[1]	₩ 5		₩ 5
Book value	[1]	5		5
Fair value	[1]	₩ 5		₩ 5
World One Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	401		401
Ownership	[1]	0.58%		0.58%
Acquisition Cost	[1]	₩ 10		₩ 10
Book value	[1]	10		10
Fair value	[1]	₩ 10		₩ 10
Yewon Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	24		24
Ownership	[1]	0.02%		0.02%
Acquisition Cost	[1]	₩ 1		₩ 1
Book value	[1]	0		0
Fair value	[1]	₩ 0		₩ 0
Seeun P&P Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			163
Ownership	[1]			0.48%
Acquisition Cost	[1]			₩ 33
Book value	[1]			33
Fair value	[1]			₩ 33
TSNT Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	119		119
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 24		₩ 24
Book value	[1]	24		24
Fair value	[1]	₩ 24		₩ 24
Shinsung Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	314		314
Ownership	[1]	0.01%		0.01%
Acquisition Cost	[1]	₩ 16		₩ 16
Book value	[1]	16		16
Fair value	[1]	₩ 16		₩ 16
JSL Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	51		51
Ownership	[1]	0.49%		0.49%
Acquisition Cost	[1]	₩ 3		₩ 3
Book value	[1]	3		3
Fair value	[1]	₩ 3		₩ 3
Loft Garden Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1		1
Ownership	[1]	0.04%		0.04%
Acquisition Cost	[1]	₩ 0		₩ 0
Book value	[1]	0		0
Fair value	[1]	₩ 0		₩ 0
Handon Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	74		74
Ownership	[1]	0.25%		0.25%
Acquisition Cost	[1]	₩ 11		₩ 11
Book value	[1]	11		11
Fair value	[1]	₩ 11		₩ 11
GH Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	82		82
Ownership	[1]	0.22%		0.22%
Acquisition Cost	[1]	₩ 3		₩ 3
Book value	[1]	3		3
Fair value	[1]	₩ 3		₩ 3
Daeo Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	13		13
Ownership	[1]	0.23%		0.23%
Acquisition Cost	[1]	₩ 4		₩ 4
Book value	[1]	4		4
Fair value	[1]	₩ 4		₩ 4
Bokwang Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	76		76
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 15		₩ 15
Book value	[1]	15		15
Fair value	[1]	₩ 15		₩ 15
Samkum Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	201		201
Ownership	[1]	0.48%		0.48%
Acquisition Cost	[1]	₩ 40		₩ 40
Book value	[1]	40		40
Fair value	[1]	₩ 40		₩ 40
Dyntex Korea Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	75		75
Ownership	[1]	0.28%		0.28%
Acquisition Cost	[1]	₩ 15		₩ 15
Book value	[1]	15		15
Fair value	[1]	₩ 15		₩ 15
IGSP Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			17,662
Ownership	[1]			0.21%
Acquisition Cost	[1]			₩ 18
Book value	[1]			18
Fair value	[1]			₩ 18
Mirae Engineering Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	66		66
Ownership	[1]	0.15%		0.15%
Acquisition Cost	[1]	₩ 1		₩ 1
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
Mideumeul-juneun-namu Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	119		119
Ownership	[1]	0.53%		0.53%
Acquisition Cost	[1]	₩ 6		₩ 6
Book value	[1]	6		6
Fair value	[1]	₩ 6		₩ 6
Leagis Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			829
Ownership	[1]			1.38%
Acquisition Cost	[1]			₩ 66
Book value	[1]			66
Fair value	[1]			₩ 66
Seil Textile Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	16		16
Ownership	[1]	0.15%		0.15%
Acquisition Cost	[1]	₩ 3		₩ 3
Book value	[1]	3		3
Fair value	[1]	₩ 3		₩ 3
Ilshin Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	36		36
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 7		₩ 7
Book value	[1]	7		7
Fair value	[1]	₩ 7		₩ 7
Magtec Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	28		28
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 6		₩ 6
Book value	[1]	6		6
Fair value	[1]	₩ 6		₩ 6
Sukwon Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	2,885		2,885
Ownership	[1]	0.59%		0.59%
Acquisition Cost	[1]	₩ 29		₩ 29
Book value	[1]	29		29
Fair value	[1]	₩ 29		₩ 29
Hae-sung Metal Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	159		159
Ownership	[1]	0.17%		0.17%
Acquisition Cost	[1]	₩ 3		₩ 3
Book value	[1]	3		3
Fair value	[1]	₩ 3		₩ 3
White&Clean Foods Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	330		330
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 3		₩ 3
Book value	[1]	3		3
Fair value	[1]	₩ 3		₩ 3
Michang Cable Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,096		861
Ownership	[1]	0.26%		0.13%
Acquisition Cost	[1]	₩ 16		₩ 4
Book value	[1]	16		4
Fair value	[1]	₩ 16		₩ 4
G.M Foods Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	57		57
Ownership	[1]	0.16%		0.16%
Acquisition Cost	[1]	₩ 9		₩ 9
Book value	[1]	9		9
Fair value	[1]	₩ 9		₩ 9
Wecan Global Inc. Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	165		165
Ownership	[1]	0.08%		0.08%
Acquisition Cost	[1]	₩ 8		₩ 8
Book value	[1]	8		8
Fair value	[1]	₩ 8		₩ 8
Daeju Steel Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	11		11
Ownership	[1]	0.20%		0.20%
Acquisition Cost	[1]	₩ 1		₩ 1
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
Hyundai Glass Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	860		860
Ownership	[1]	0.83%		0.83%
Acquisition Cost	[1]	₩ 43		₩ 43
Book value	[1]	43		43
Fair value	[1]	₩ 43		₩ 43
MEC Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	16,468		16,468
Ownership	[1]	1.17%		1.17%
Acquisition Cost	[1]	₩ 41		₩ 41
Book value	[1]	41		41
Fair value	[1]	₩ 41		₩ 41
Daeyeoneco Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	151		151
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 15		₩ 15
Book value	[1]	15		15
Fair value	[1]	₩ 15		₩ 15
Hyesung Cable&Communication Inc.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	762		762
Ownership	[1]	0.39%		0.39%
Acquisition Cost	[1]	₩ 38		₩ 38
Book value	[1]	38		38
Fair value	[1]	₩ 38		₩ 38
Sangjin Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	428		428
Ownership	[1]	0.35%		0.35%
Acquisition Cost	[1]	₩ 21		₩ 21
Book value	[1]	21		21
Fair value	[1]	₩ 21		₩ 21
Topis Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	246		246
Ownership	[1]	0.71%		0.71%
Acquisition Cost	[1]	₩ 14		₩ 14
Book value	[1]	14		14
Fair value	[1]	₩ 14		₩ 14
G & L Tech Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	2		2
Ownership	[1]	0.06%		0.06%
Acquisition Cost	[1]	₩ 0		₩ 0
Book value	[1]	0		0
Fair value	[1]	₩ 0		₩ 0
Cheonhae Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	72		72
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 2		₩ 2
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
Iksan-guwon Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	563		563
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 11		₩ 11
Book value	[1]	11		11
Fair value	[1]	₩ 11		₩ 11
Korea Remicon Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	36		36
Ownership	[1]	0.03%		0.03%
Acquisition Cost	[1]	₩ 5		₩ 5
Book value	[1]	5		5
Fair value	[1]	₩ 5		₩ 5
New Tech Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	23		23
Ownership	[1]	0.15%		0.15%
Acquisition Cost	[1]	₩ 2		₩ 2
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
Segeon Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	124		124
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 4		₩ 4
Book value	[1]	4		4
Fair value	[1]	₩ 4		₩ 4
MS Tech Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	9		9
Ownership	[1]	0.15%		0.15%
Acquisition Cost	[1]	₩ 1		₩ 1
Book value	[1]	1		1
Fair value	[1]	₩ 1		₩ 1
J.I Steel Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	21		21
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 2		₩ 2
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 2
HNT Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	172		172
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 9		₩ 9
Book value	[1]	9		9
Fair value	[1]	₩ 9		₩ 9
Taejin Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	27		27
Ownership	[1]	0.08%		0.08%
Acquisition Cost	[1]	₩ 3		₩ 3
Book value	[1]	3		3
Fair value	[1]	₩ 3		₩ 3
Macroad Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	953		953
Ownership	[1]	0.17%		0.17%
Acquisition Cost	[1]	₩ 10		₩ 10
Book value	[1]	10		10
Fair value	[1]	₩ 10		₩ 10
Jinsung Electronics Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			69
Ownership	[1]			1.41%
Acquisition Cost	[1]			₩ 14
Book value	[1]			14
Fair value	[1]			₩ 14
Woongjin Energy Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	94		94
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 9		₩ 9
Book value	[1]	9		9
Fair value	[1]	₩ 9		₩ 9
Electric Contractors' Financial Cooperative Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	0		0
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 39		₩ 38
Book value	[1]	39		38
Fair value	[1]	₩ 39		₩ 38
Information&Communication Financial Cooperative Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	0		0
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 15		₩ 15
Book value	[1]	15		15
Fair value	[1]	₩ 15		₩ 15
Common Computer Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	3,856		3,856
Ownership	[1]	1.87%		1.87%
Acquisition Cost	[1]	₩ 1,000		₩ 1,000
Book value	[1]	1,000		1,000
Fair value	[1]	₩ 1,000		₩ 1,000
Fine Powerex Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	72,633		72,633
Ownership	[1]	4.92%		4.92%
Acquisition Cost	[1]	₩ 1,500		₩ 1,500
Book value	[1]	1,500		1,500
Fair value	[1]	₩ 1,500		₩ 1,500
Aron Flying Ship Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	0		0
Ownership	[1]	0%		0%
Acquisition Cost	[1]	₩ 500		₩ 500
Book value	[1]	529		491
Fair value	[1]	₩ 529		₩ 491
Altron Jeonju Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	34,846
Ownership	[1]	1.34%
Acquisition Cost	[1]	₩ 697
Book value	[1]	5
Fair value	[1]	₩ 5
Eunsung Industrial Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	3
Ownership	[1]	0.03%
Acquisition Cost	[1]	₩ 1
Book value	[1]	1
Fair value	[1]	₩ 1
KPE Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	51
Ownership	[1]	0.19%
Acquisition Cost	[1]	₩ 13
Book value	[1]	13
Fair value	[1]	₩ 13
Dongbangfarms Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	904
Ownership	[1]	0.55%
Acquisition Cost	[1]	₩ 41
Book value	[1]	5
Fair value	[1]	₩ 5
Sungdo Pack Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	15
Ownership	[1]	0.06%
Acquisition Cost	[1]	₩ 1
Book value	[1]	1
Fair value	[1]	₩ 1
Coffeenie Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	2
Ownership	[1]	0%
Acquisition Cost	[1]	₩ 1
Book value	[1]	1
Fair value	[1]	₩ 1
Medi Pharma Plan Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,075
Ownership	[1]	0.26%
Acquisition Cost	[1]	₩ 108
Book value	[1]	8
Fair value	[1]	₩ 8
Woori Ascon Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	25
Ownership	[1]	0.34%
Acquisition Cost	[1]	₩ 10
Book value	[1]	10
Fair value	[1]	₩ 10
Dong Shin Hydraulies Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	9,460
Ownership	[1]	0.14%
Acquisition Cost	[1]	₩ 47
Book value	[1]	47
Fair value	[1]	₩ 47
Cheonwoo E.P.S Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	371
Ownership	[1]	1.10%
Acquisition Cost	[1]	₩ 19
Book value	[1]	19
Fair value	[1]	₩ 19
Koa Tech Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,244
Ownership	[1]	0.77%
Acquisition Cost	[1]	₩ 12
Book value	[1]	12
Fair value	[1]	₩ 12
Jinwoo Textile Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	91
Ownership	[1]	0.68%
Acquisition Cost	[1]	₩ 9
Book value	[1]	9
Fair value	[1]	₩ 9
SKE Cable Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	120
Ownership	[1]	0.08%
Acquisition Cost	[1]	₩ 6
Book value	[1]	6
Fair value	[1]	₩ 6
Hi Korea Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,845
Ownership	[1]	1.94%
Acquisition Cost	[1]	₩ 185
Book value	[1]	185
Fair value	[1]	₩ 185
Daeheung Engineering Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	65
Ownership	[1]	0.01%
Acquisition Cost	[1]	₩ 1
Book value	[1]	1
Fair value	[1]	₩ 1
Etapol Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,361
Ownership	[1]	0.54%
Acquisition Cost	[1]	₩ 41
Book value	[1]	41
Fair value	[1]	₩ 41
Yoongwon International Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	157
Ownership	[1]	1.47%
Acquisition Cost	[1]	₩ 31
Book value	[1]	31
Fair value	[1]	₩ 31
Avoh CeramicBath Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	173
Ownership	[1]	0.14%
Acquisition Cost	[1]	₩ 3
Book value	[1]	3
Fair value	[1]	₩ 3
Dongyang R.P.F. Industrial Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	59
Ownership	[1]	0.03%
Acquisition Cost	[1]	₩ 2
Book value	[1]	2
Fair value	[1]	₩ 2
Yuil Engineering Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	14
Ownership	[1]	0.03%
Acquisition Cost	[1]	₩ 1
Book value	[1]	1
Fair value	[1]	₩ 1
Taesan Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	146
Ownership	[1]	0.69%
Acquisition Cost	[1]	₩ 35
Book value	[1]	35
Fair value	[1]	₩ 35
Jico Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	10,581
Ownership	[1]	0.01%
Acquisition Cost	[1]	₩ 26
Book value	[1]	26
Fair value	[1]	₩ 26
K Shipbuilding Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	8,622
Ownership	[1]	0.25%
Acquisition Cost	[1]	₩ 1,078
Book value	[1]	1,078
Fair value	[1]	₩ 1,078
Seokjin ET Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	81
Ownership	[1]	0.06%
Acquisition Cost	[1]	₩ 8
Book value	[1]	8
Fair value	[1]	₩ 8
Agencore Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	104,350
Ownership	[1]	5.67%
Acquisition Cost	[1]	₩ 1,200
Book value	[1]	1,200
Fair value	[1]	₩ 1,200
SamHong Machinery. EMC Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	476,192
Ownership	[1]	19.23%
Acquisition Cost	[1]	₩ 5,000
Book value	[1]	5,000
Fair value	[1]	₩ 5,000
Thermo Tec Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	446
Ownership	[1]	0.03%
Acquisition Cost	[1]	₩ 4
Book value	[1]	4
Fair value	[1]	₩ 4
DaeYang Hydro Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	6
Ownership	[1]	0.02%
Acquisition Cost	[1]	₩ 1
Book value	[1]	1
Fair value	[1]	₩ 1
SangMoo Steel Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	24
Ownership	[1]	0.04%
Acquisition Cost	[1]	₩ 2
Book value	[1]	2
Fair value	[1]	₩ 2
Jungin Distribution Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	17
Ownership	[1]	0%
Acquisition Cost	[1]	₩ 3
Book value	[1]	3
Fair value	[1]	₩ 3
TheSun Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	77
Ownership	[1]	0.06%
Acquisition Cost	[1]	₩ 1
Book value	[1]	1
Fair value	[1]	₩ 1
Daedong Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	176
Ownership	[1]	0.33%
Acquisition Cost	[1]	₩ 18
Book value	[1]	18
Fair value	[1]	₩ 18
Daewoong and Technology Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	423
Ownership	[1]	1.14%
Acquisition Cost	[1]	₩ 42
Book value	[1]	42
Fair value	[1]	₩ 42
Ebadom Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	361
Ownership	[1]	0.21%
Acquisition Cost	[1]	₩ 58
Book value	[1]	58
Fair value	[1]	₩ 58
ChoungHwa Precise Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	428
Ownership	[1]	0.08%
Acquisition Cost	[1]	₩ 43
Book value	[1]	4
Fair value	[1]	₩ 4
Snopa Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	458
Ownership	[1]	0.01%
Acquisition Cost	[1]	₩ 5
Book value	[1]	5
Fair value	[1]	₩ 5
Aloha Factory Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	2,970
Ownership	[1]	3.61%
Acquisition Cost	[1]	₩ 1,000
Book value	[1]	1,000
Fair value	[1]	₩ 1,000
Dailyshot Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	339
Ownership	[1]	1.85%
Acquisition Cost	[1]	₩ 1,001
Book value	[1]	1,001
Fair value	[1]	₩ 1,001
Mediquitous Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	5,080
Ownership	[1]	0.69%
Acquisition Cost	[1]	₩ 1,250
Book value	[1]	1,250
Fair value	[1]	₩ 1,250
SKD Korea Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	40
Ownership	[1]	0.28%
Acquisition Cost	[1]	₩ 20
Book value	[1]	20
Fair value	[1]	₩ 20
Samhyup Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	376
Ownership	[1]	0.91%
Acquisition Cost	[1]	₩ 38
Book value	[1]	38
Fair value	[1]	₩ 38
Gogang Aluminum Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	828
Ownership	[1]	1.52%
Acquisition Cost	[1]	₩ 41
Book value	[1]	41
Fair value	[1]	₩ 41
Taekwang Paper Board Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	133
Ownership	[1]	0.49%
Acquisition Cost	[1]	₩ 23
Book value	[1]	23
Fair value	[1]	₩ 23
NY Tech Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	33
Ownership	[1]	0.15%
Acquisition Cost	[1]	₩ 2
Book value	[1]	2
Fair value	[1]	₩ 2
Sekwang Precision Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	394
Ownership	[1]	0.84%
Acquisition Cost	[1]	₩ 79
Book value	[1]	79
Fair value	[1]	₩ 79
Dongbang Metal Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,985
Ownership	[1]	0.32%
Acquisition Cost	[1]	₩ 20
Book value	[1]	20
Fair value	[1]	₩ 20
Samwang Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	170
Ownership	[1]	0.25%
Acquisition Cost	[1]	₩ 17
Book value	[1]	17
Fair value	[1]	₩ 17
Yurim CNF Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	15
Ownership	[1]	0.23%
Acquisition Cost	[1]	₩ 2
Book value	[1]	2
Fair value	[1]	₩ 2
Guseul Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	89
Ownership	[1]	0.23%
Acquisition Cost	[1]	₩ 9
Book value	[1]	9
Fair value	[1]	₩ 9
Gaone International Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	54
Ownership	[1]	0.29%
Acquisition Cost	[1]	₩ 14
Book value	[1]	14
Fair value	[1]	₩ 14
Daekwang Forging Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,298
Ownership	[1]	1.99%
Acquisition Cost	[1]	₩ 130
Book value	[1]	130
Fair value	[1]	₩ 130
Dongyang Pratech Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	265
Ownership	[1]	1.21%
Acquisition Cost	[1]	₩ 29
Book value	[1]	29
Fair value	[1]	₩ 29
Samjin Placo Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	661
Ownership	[1]	0.52%
Acquisition Cost	[1]	₩ 33
Book value	[1]	33
Fair value	[1]	₩ 33
MS Steel Industrial Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	167
Ownership	[1]	0.40%
Acquisition Cost	[1]	₩ 8
Book value	[1]	8
Fair value	[1]	₩ 8
STS Global Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	9
Ownership	[1]	0.04%
Acquisition Cost	[1]	₩ 1
Book value	[1]	1
Fair value	[1]	₩ 1
Y Tech Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	855
Ownership	[1]	0.65%
Acquisition Cost	[1]	₩ 34
Book value	[1]	34
Fair value	[1]	₩ 34
CK Industry Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	4,178
Ownership	[1]	7.54%
Acquisition Cost	[1]	₩ 167
Book value	[1]	167
Fair value	[1]	₩ 167
JJ Tech Co.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	14
Ownership	[1]	0.22%
Acquisition Cost	[1]	₩ 1
Book value	[1]	1
Fair value	[1]	₩ 1
Shield Board Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	165
Ownership	[1]	0.15%
Acquisition Cost	[1]	₩ 3
Book value	[1]	3
Fair value	[1]	₩ 3
SFC International Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	11
Ownership	[1]	0.01%
Acquisition Cost	[1]	₩ 1
Book value	[1]	1
Fair value	[1]	₩ 1
Korea Ocean Machinery Technology Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	763
Ownership	[1]	0.45%
Acquisition Cost	[1]	₩ 76
Book value	[1]	76
Fair value	[1]	₩ 76
Hana ITM Inc.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	8,443
Ownership	[1]	0.70%
Acquisition Cost	[1]	₩ 84
Book value	[1]	84
Fair value	[1]	₩ 84
Jeuvis Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	191
Ownership	[1]	0.30%
Acquisition Cost	[1]	₩ 2
Book value	[1]	2
Fair value	[1]	₩ 2
JBM Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	662
Ownership	[1]	0.34%
Acquisition Cost	[1]	₩ 20
Book value	[1]	20
Fair value	[1]	₩ 20
Jungwoo Metal Solution Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	27
Ownership	[1]	0.08%
Acquisition Cost	[1]	₩ 2
Book value	[1]	2
Fair value	[1]	₩ 2
MS Precision Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	220
Ownership	[1]	0.16%
Acquisition Cost	[1]	₩ 22
Book value	[1]	22
Fair value	[1]	₩ 22
YM Tech Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	2
Ownership	[1]	0.01%
Acquisition Cost	[1]	₩ 1
Book value	[1]	1
Fair value	[1]	₩ 1
YM Tech Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	439
Ownership	[1]	1.59%
Acquisition Cost	[1]	₩ 22
Book value	[1]	22
Fair value	[1]	₩ 22
Minjin Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	24
Ownership	[1]	0.01%
Acquisition Cost	[1]	₩ 1
Book value	[1]	1
Fair value	[1]	₩ 1
Daejoo EG Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	133
Ownership	[1]	0%
Acquisition Cost	[1]	₩ 27
Book value	[1]	27
Fair value	[1]	₩ 27
Taeyoung Precision Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	31
Ownership	[1]	0.22%
Acquisition Cost	[1]	₩ 1
Book value	[1]	1
Fair value	[1]	₩ 1
Shin Heung Precision Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	93
Ownership	[1]	4.63%
Acquisition Cost	[1]	₩ 4
Book value	[1]	4
Fair value	[1]	₩ 4
TaeGwang PC Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	530
Ownership	[1]	0.90%
Acquisition Cost	[1]	₩ 13
Book value	[1]	13
Fair value	[1]	₩ 13
KyeongGwang Tech Co.,Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	244
Ownership	[1]	1.04%
Acquisition Cost	[1]	₩ 7
Book value	[1]	7
Fair value	[1]	₩ 7
[1]The Company used initial cost as their fair value because there was not enough information to determine fair value, and the range of the estimated fair value is wide.[2]The Company has estimated the fair value of Set Holding by using the discounted cash flow method and has recognized the difference between its fair value and book value as gain or loss on valuation of financial assets at FVOCI in other comprehensive income or loss during the year ended December 31, 2022.[3]The Company has estimated the fair value of Set Holding by using the discounted cash flow method and has recognized the difference between its fair value and book value as gain or loss on valuation of financial assets at FVOCI in other comprehensive income or loss during the year ended December 31, 2021.

Financial Assets at Amortized_3

Financial Assets at Amortized Cost - Summary of Financial Assets at Amortized Cost (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Financial Assets at Amortized Cost [Line Items]
Current financial assets at amortized costs	₩ 16,762	₩ 15,422
Non-current financial assets at amortized costs	10,236	9,851
Financial assets at amortized costs	26,998	25,273
Gross carrying amount [member]
Financial Assets at Amortized Cost [Line Items]
Current financial assets at amortized costs	16,762	15,422
Non-current financial assets at amortized costs	10,236	9,851
Financial assets at amortized costs	26,998	25,273
Government bonds
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	1,920	1,308
Government bonds | Gross carrying amount [member]
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	1,920	1,308
Others
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	25,078	23,965
Others | Gross carrying amount [member]
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	₩ 25,078	₩ 23,965

Derivative Instrument - Summary

Derivative Instrument - Summary of Derivative (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Current derivative financial assets		₩ 289,603	₩ 126,938
Non-current derivative financial assets		728,421	520,845
Current derivative financial liabilities		44,994	7,291
Non-current derivative financial liabilities		387,757	70,740
Disclosure of Gain and loss on valuation and transaction of derivatives and included in finance income and costs in the consolidated statements of comprehensive income (loss)
Net income effects of valuation gain (loss)		224,218	822,994	₩ (455,715)
Net income effects of transaction gain (loss)		224,685	84,082	65,393
Accumulated other comprehensive income (loss)	[1]	(65,052)	(40,460)	111,220
Currency forward | Not Designated as Hedging Instrument
Derivative [Line Items]
Current derivative financial assets		648	559
Non-current derivative financial assets		17,432	6,899
Current derivative financial liabilities		32,660	301
Non-current derivative financial liabilities		0	0
Disclosure of Gain and loss on valuation and transaction of derivatives and included in finance income and costs in the consolidated statements of comprehensive income (loss)
Net income effects of valuation gain (loss)		(20,570)	33,066	(40,590)
Net income effects of transaction gain (loss)		(2,710)	33,032	(17,911)
Accumulated other comprehensive income (loss)	[1]	0	0	0
Currency swap
Derivative [Line Items]
Current derivative financial assets		236,470	125,877
Non-current derivative financial assets		589,300	506,957
Current derivative financial liabilities		6,319	4,446
Non-current derivative financial liabilities		328,995	16,708
Disclosure of Gain and loss on valuation and transaction of derivatives and included in finance income and costs in the consolidated statements of comprehensive income (loss)
Net income effects of valuation gain (loss)		155,937	787,264	(406,607)
Net income effects of transaction gain (loss)		234,195	61,353	93,557
Accumulated other comprehensive income (loss)	[1]	(102,969)	(59,108)	105,642
Currency swap | Not Designated as Hedging Instrument
Derivative [Line Items]
Current derivative financial assets		102,080	92,313
Non-current derivative financial assets		410,540	335,765
Current derivative financial liabilities		6,319	4,446
Non-current derivative financial liabilities		302,415	15,576
Disclosure of Gain and loss on valuation and transaction of derivatives and included in finance income and costs in the consolidated statements of comprehensive income (loss)
Net income effects of valuation gain (loss)		(77,618)	420,551	(108,090)
Net income effects of transaction gain (loss)		104,572	16,265	16,661
Accumulated other comprehensive income (loss)	[1]	0	0	0
Currency swap | Designated as Hedging Instrument
Derivative [Line Items]
Current derivative financial assets		134,390	33,564
Non-current derivative financial assets		178,760	171,192
Current derivative financial liabilities		0	0
Non-current derivative financial liabilities		26,580	1,132
Disclosure of Gain and loss on valuation and transaction of derivatives and included in finance income and costs in the consolidated statements of comprehensive income (loss)
Net income effects of valuation gain (loss)		233,555	366,713	(298,517)
Net income effects of transaction gain (loss)		129,623	45,088	76,896
Accumulated other comprehensive income (loss)	[1]	(102,969)	(59,108)	105,642
Interest rate swap
Derivative [Line Items]
Current derivative financial assets		52,485	502
Non-current derivative financial assets		81,188	6,980
Current derivative financial liabilities		0	2,544
Non-current derivative financial liabilities		2,735	28,138
Disclosure of Gain and loss on valuation and transaction of derivatives and included in finance income and costs in the consolidated statements of comprehensive income (loss)
Net income effects of valuation gain (loss)		66,341	18,123	(1,845)
Net income effects of transaction gain (loss)		(6,800)	(10,303)	(10,253)
Accumulated other comprehensive income (loss)	[1]	37,917	18,648	5,578
Interest rate swap | Not Designated as Hedging Instrument
Derivative [Line Items]
Current derivative financial assets		52,485	502
Non-current derivative financial assets		81,188	6,980
Current derivative financial liabilities		0	174
Non-current derivative financial liabilities		2,735	2,829
Disclosure of Gain and loss on valuation and transaction of derivatives and included in finance income and costs in the consolidated statements of comprehensive income (loss)
Net income effects of valuation gain (loss)		66,341	18,123	(309)
Net income effects of transaction gain (loss)		(6,800)	(10,303)	(11,975)
Accumulated other comprehensive income (loss)	[1]	0	0	0
Interest rate swap | Designated as Hedging Instrument
Derivative [Line Items]
Current derivative financial assets		0	0
Non-current derivative financial assets		0	0
Current derivative financial liabilities		0	2,370
Non-current derivative financial liabilities		0	25,309
Disclosure of Gain and loss on valuation and transaction of derivatives and included in finance income and costs in the consolidated statements of comprehensive income (loss)
Net income effects of valuation gain (loss)		0	0	(1,536)
Net income effects of transaction gain (loss)		0	0	1,722
Accumulated other comprehensive income (loss)	[1]	37,917	18,648	5,578
Others | Not Designated as Hedging Instrument
Derivative [Line Items]
Current derivative financial assets	[2]	0	0
Non-current derivative financial assets	[2]	40,501	9
Current derivative financial liabilities	[2],[3],[4]	6,015	0
Non-current derivative financial liabilities	[2],[3],[4]	56,027	25,894
Disclosure of Gain and loss on valuation and transaction of derivatives and included in finance income and costs in the consolidated statements of comprehensive income (loss)
Net income effects of valuation gain (loss)		22,510	(15,459)	(6,673)
Net income effects of transaction gain (loss)		0	0	0
Accumulated other comprehensive income (loss)	[1]	₩ 0	₩ 0	₩ 0
[1]For the year ended December 31, 2022, the net loss on valuation of derivatives applying cash flow hedge accounting of ￦24,415 million, net of tax, is included in other comprehensive income (loss).[2]The Company has an obligation to purchase the shares of Hyundai Green Power Co., Ltd., an associate of the Company from financial investors, and the fair value of the obligation is recorded in ‘Others’.[3]The Company has an obligation to settle the convertible preferred stock to financial investors pursuant to the settlement contract with Samcheok Eco Materials Co., Ltd. and the fair value of the obligation is recorded in ‘Others’(See note 47).[4]The Company has granted stock option to Chester Solar IV SpA, a joint venture of the Company, and 4 other third party investors, and recognized its fair value as other derivative liabilities.

Derivative Instrument - Summa_2

Derivative Instrument - Summary of Derivatives (Parenthetical) (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivatives [Abstract]
Net gain on valuation of derivatives designated as cash flow hedge	₩ 24,415	₩ 15,778	₩ (64,562)

Derivatives - Summary of Deriva

Derivatives - Summary of Derivative Currency Swap Forward Contract List (Details) - 12 months ended Dec. 31, 2022 - Currency forward contracts $ in Thousands, ₩ in Millions	KRW (₩)	USD ($)
Disclosure of Derivative Currency forward contract detail list [Line Items]
Derivative Counterparty	Busan Bank	Busan Bank
Contract date	Dec. 08, 2022	Dec. 08, 2022
Maturity date	Jan. 09, 2023	Jan. 09, 2023
Contract Amount Pay | ₩	₩ 9,237
Contract Amount Receive | $		$ 7,000
Contract exchange rate	1,319.5	1,319.5
Derivative Counterparty	Woori Bank	Woori Bank
Contract date	Dec. 09, 2022	Dec. 09, 2022
Maturity date	Jan. 06, 2023	Jan. 06, 2023
Contract Amount Pay | ₩	₩ 13,165
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,316.45	1,316.45
Derivative Counterparty	Nonghyup Bank	Nonghyup Bank
Contract date	Dec. 13, 2022	Dec. 13, 2022
Maturity date	Jan. 10, 2023	Jan. 10, 2023
Contract Amount Pay | ₩	₩ 10,430
Contract Amount Receive | $		$ 8,000
Contract exchange rate	1,303.8	1,303.8
Derivative Counterparty	Kookmin Bank	Kookmin Bank
Contract date	Dec. 15, 2022	Dec. 15, 2022
Maturity date	Jan. 16, 2023	Jan. 16, 2023
Contract Amount Pay | ₩	₩ 12,988
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,298.84	1,298.84
Derivative Counterparty	Hana Bank	Hana Bank
Contract date	Dec. 15, 2022	Dec. 15, 2022
Maturity date	Jan. 17, 2023	Jan. 17, 2023
Contract Amount Pay | ₩	₩ 28,632
Contract Amount Receive | $		$ 22,000
Contract exchange rate	1,301.45	1,301.45
Derivative Counterparty	Standard Chartered	Standard Chartered
Contract date	Dec. 16, 2022	Dec. 16, 2022
Maturity date	Jan. 18, 2023	Jan. 18, 2023
Contract Amount Pay | ₩	₩ 26,141
Contract Amount Receive | $		$ 20,000
Contract exchange rate	1,307.05	1,307.05
Derivative Counterparty	Mizuho Bank	Mizuho Bank
Contract date	Dec. 16, 2022	Dec. 16, 2022
Maturity date	Jan. 19, 2023	Jan. 19, 2023
Contract Amount Pay | ₩	₩ 26,096
Contract Amount Receive | $		$ 20,000
Contract exchange rate	1,304.8	1,304.8
Derivative Counterparty	JP Morgan	JP Morgan
Contract date	Dec. 19, 2022	Dec. 19, 2022
Maturity date	Jan. 20, 2023	Jan. 20, 2023
Contract Amount Pay | ₩	₩ 26,080
Contract Amount Receive | $		$ 20,000
Contract exchange rate	1,304	1,304
Derivative Counterparty	Korea Development Bank	Korea Development Bank
Contract date	Dec. 19, 2022	Dec. 19, 2022
Maturity date	Jan. 26, 2023	Jan. 26, 2023
Contract Amount Pay | ₩	₩ 26,010
Contract Amount Receive | $		$ 20,000
Contract exchange rate	1,300.5	1,300.5
Derivative Counterparty	Kookmin Bank	Kookmin Bank
Contract date	Dec. 19, 2022	Dec. 19, 2022
Maturity date	Jan. 27, 2023	Jan. 27, 2023
Contract Amount Pay | ₩	₩ 25,959
Contract Amount Receive | $		$ 20,000
Contract exchange rate	1,297.93	1,297.93
Derivative Counterparty	Busan Bank	Busan Bank
Contract date	Dec. 21, 2022	Dec. 21, 2022
Maturity date	Jan. 25, 2023	Jan. 25, 2023
Contract Amount Pay | ₩	₩ 12,853
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,285.25	1,285.25
Derivative Counterparty	Nonghyup Bank	Nonghyup Bank
Contract date	Dec. 21, 2022	Dec. 21, 2022
Maturity date	Jan. 26, 2023	Jan. 26, 2023
Contract Amount Pay | ₩	₩ 14,134
Contract Amount Receive | $		$ 11,000
Contract exchange rate	1,284.9	1,284.9
Derivative Counterparty	Hana Bank	Hana Bank
Contract date	Dec. 27, 2022	Dec. 27, 2022
Maturity date	Jan. 30, 2023	Jan. 30, 2023
Contract Amount Pay | ₩	₩ 18,992
Contract Amount Receive | $		$ 15,000
Contract exchange rate	1,266.15	1,266.15
Derivative Counterparty	Standard Chartered	Standard Chartered
Contract date	Dec. 28, 2022	Dec. 28, 2022
Maturity date	Jan. 31, 2023	Jan. 31, 2023
Contract Amount Pay | ₩	₩ 15,216
Contract Amount Receive | $		$ 12,000
Contract exchange rate	1,268	1,268
Derivative Counterparty	Morgan Stanley	Morgan Stanley
Contract date	Dec. 28, 2022	Dec. 28, 2022
Maturity date	Feb. 01, 2023	Feb. 01, 2023
Contract Amount Pay | ₩	₩ 15,205
Contract Amount Receive | $		$ 12,000
Contract exchange rate	1,267.1	1,267.1
Derivative Counterparty	Kookmin Bank	Kookmin Bank
Contract date	Dec. 29, 2022	Dec. 29, 2022
Maturity date	Feb. 02, 2023	Feb. 02, 2023
Contract Amount Pay | ₩	₩ 20,247
Contract Amount Receive | $		$ 16,000
Contract exchange rate	1,265.44	1,265.44
Derivative Counterparty	Mizuho Bank	Mizuho Bank
Contract date	Dec. 29, 2022	Dec. 29, 2022
Maturity date	Feb. 03, 2023	Feb. 03, 2023
Contract Amount Pay | ₩	₩ 20,255
Contract Amount Receive | $		$ 16,000
Contract exchange rate	1,265.95	1,265.95
Derivative Counterparty	Kookmin Bank	Kookmin Bank
Contract date	Dec. 30, 2022	Dec. 30, 2022
Maturity date	Feb. 28, 2023	Feb. 28, 2023
Contract Amount Pay | ₩	₩ 15,128
Contract Amount Receive | $		$ 12,000
Contract exchange rate	1,260.7	1,260.7
Derivative Counterparty	Hana Bank	Hana Bank
Contract date	Dec. 06, 2022	Dec. 06, 2022
Maturity date	Jan. 06, 2023	Jan. 06, 2023
Contract Amount Pay | ₩	₩ 13,091
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,309.05	1,309.05
Derivative Counterparty	Mizuho Bank	Mizuho Bank
Contract date	Dec. 15, 2022	Dec. 15, 2022
Maturity date	Jan. 13, 2023	Jan. 13, 2023
Contract Amount Pay | ₩	₩ 26,001
Contract Amount Receive | $		$ 20,000
Contract exchange rate	1,300.07	1,300.07
Derivative Counterparty	MUFG	MUFG
Contract date	Dec. 19, 2022	Dec. 19, 2022
Maturity date	Jan. 20, 2023	Jan. 20, 2023
Contract Amount Pay | ₩	₩ 52,054
Contract Amount Receive | $		$ 40,000
Contract exchange rate	1,301.35	1,301.35
Derivative Counterparty	MUFG	MUFG
Contract date	Dec. 20, 2022	Dec. 20, 2022
Maturity date	Jan. 13, 2023	Jan. 13, 2023
Contract Amount Pay | ₩	₩ 25,952
Contract Amount Receive | $		$ 20,000
Contract exchange rate	1,297.6	1,297.6
Derivative Counterparty	MUFG	MUFG
Contract date	Dec. 29, 2022	Dec. 29, 2022
Maturity date	Jan. 27, 2023	Jan. 27, 2023
Contract Amount Pay | ₩	₩ 45,605
Contract Amount Receive | $		$ 36,000
Contract exchange rate	1,266.8	1,266.8
Derivative Counterparty	Shinhan Bank	Shinhan Bank
Contract date	Nov. 03, 2022	Nov. 03, 2022
Maturity date	Jan. 09, 2023	Jan. 09, 2023
Contract Amount Pay | ₩	₩ 7,085
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,417	1,417
Derivative Counterparty	JP Morgan	JP Morgan
Contract date	Nov. 07, 2022	Nov. 07, 2022
Maturity date	Jan. 13, 2023	Jan. 13, 2023
Contract Amount Pay | ₩	₩ 14,012
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,401.2	1,401.2
Derivative Counterparty	JP Morgan	JP Morgan
Contract date	Nov. 25, 2022	Nov. 25, 2022
Maturity date	Jan. 20, 2023	Jan. 20, 2023
Contract Amount Pay | ₩	₩ 6,611
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,322.1	1,322.1
Derivative Counterparty	JP Morgan	JP Morgan
Contract date	Dec. 29, 2022	Dec. 29, 2022
Maturity date	Jan. 05, 2023	Jan. 05, 2023
Contract Amount Pay | ₩	₩ 38,040
Contract Amount Receive | $		$ 30,000
Contract exchange rate	1,268	1,268
Derivative Counterparty	Standard Chartered	Standard Chartered
Contract date	Dec. 29, 2022	Dec. 29, 2022
Maturity date	Jan. 05, 2023	Jan. 05, 2023
Contract Amount Pay | ₩	₩ 25,358
Contract Amount Receive | $		$ 20,000
Contract exchange rate	1,267.9	1,267.9
Derivative Counterparty	Mizuho Bank	Mizuho Bank
Contract date	Nov. 09, 2022	Nov. 09, 2022
Maturity date	Jan. 06, 2023	Jan. 06, 2023
Contract Amount Pay | ₩	₩ 13,681
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,368.1	1,368.1
Derivative Counterparty	Nonghyup Bank	Nonghyup Bank
Contract date	Dec. 27, 2022	Dec. 27, 2022
Maturity date	Jan. 16, 2023	Jan. 16, 2023
Contract Amount Pay | ₩	₩ 6,334
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,266.7	1,266.7
Derivative Counterparty	Mizuho Bank	Mizuho Bank
Contract date	Nov. 11, 2022	Nov. 11, 2022
Maturity date	Jan. 30, 2023	Jan. 30, 2023
Contract Amount Pay | ₩	₩ 5,207
Contract Amount Receive | $		$ 3,842
Contract exchange rate	1,355.05	1,355.05
Derivative Counterparty	Mizuho Bank	Mizuho Bank
Contract date	Nov. 11, 2022	Nov. 11, 2022
Maturity date	Jan. 30, 2023	Jan. 30, 2023
Contract Amount Pay | ₩	₩ 34,001
Contract Amount Receive | $		$ 25,000
Contract exchange rate	1,360.05	1,360.05
Derivative Counterparty	Nonghyup Bank	Nonghyup Bank
Contract date	Dec. 21, 2022	Dec. 21, 2022
Maturity date	Feb. 23, 2023	Feb. 23, 2023
Contract Amount Pay | ₩	₩ 3,603
Contract Amount Receive | $		$ 2,806
Contract exchange rate	1,283.7	1,283.7
Derivative Counterparty	SMBC	SMBC
Contract date	Nov. 30, 2022	Nov. 30, 2022
Maturity date	Jan. 20, 2023	Jan. 20, 2023
Contract Amount Pay | $		$ 10,000
Contract Amount Receive | ₩	₩ 13,153
Contract exchange rate	1,315.3	1,315.3
Derivative Counterparty	SMBC	SMBC
Contract date	Nov. 30, 2022	Nov. 30, 2022
Maturity date	Feb. 16, 2023	Feb. 16, 2023
Contract Amount Pay | $		$ 15,000
Contract Amount Receive | ₩	₩ 19,783
Contract exchange rate	1,318.85	1,318.85
Derivative Counterparty	SMBC	SMBC
Contract date	Dec. 26, 2022	Dec. 26, 2022
Maturity date	Mar. 23, 2023	Mar. 23, 2023
Contract Amount Pay | $		$ 8,000
Contract Amount Receive | ₩	₩ 10,173
Contract exchange rate	1,271.6	1,271.6
Derivative Counterparty	SMBC	SMBC
Contract date	Dec. 29, 2022	Dec. 29, 2022
Maturity date	Mar. 28, 2023	Mar. 28, 2023
Contract Amount Pay | $		$ 15,000
Contract Amount Receive | ₩	₩ 18,933
Contract exchange rate	1,262.2	1,262.2
Derivative Counterparty	SMBC	SMBC
Contract date	Dec. 29, 2022	Dec. 29, 2022
Maturity date	Jun. 13, 2023	Jun. 13, 2023
Contract Amount Pay | $		$ 15,000
Contract Amount Receive | ₩	₩ 18,872
Contract exchange rate	1,258.1	1,258.1
Derivative Counterparty	MUFG	MUFG
Contract date	Nov. 25, 2022	Nov. 25, 2022
Maturity date	Feb. 08, 2023	Feb. 08, 2023
Contract Amount Pay | ₩	₩ 13,175
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,317.5	1,317.5
Derivative Counterparty	MUFG	MUFG
Contract date	Dec. 12, 2022	Dec. 12, 2022
Maturity date	Feb. 27, 2023	Feb. 27, 2023
Contract Amount Pay | ₩	₩ 33,947
Contract Amount Receive | $		$ 26,000
Contract exchange rate	1,305.64	1,305.64
Derivative Counterparty	MUFG	MUFG
Contract date	Nov. 24, 2022	Nov. 24, 2022
Maturity date	Jan. 30, 2023	Jan. 30, 2023
Contract Amount Pay | ₩	₩ 13,234
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,323.4	1,323.4
Derivative Counterparty	JP Morgan	JP Morgan
Contract date	Nov. 24, 2022	Nov. 24, 2022
Maturity date	Jan. 30, 2023	Jan. 30, 2023
Contract Amount Pay | ₩	₩ 13,830
Contract Amount Receive | $		$ 10,406
Contract exchange rate	1,329.05	1,329.05
Derivative Counterparty	JP Morgan	JP Morgan
Contract date	Nov. 30, 2022	Nov. 30, 2022
Maturity date	Jan. 17, 2023	Jan. 17, 2023
Contract Amount Pay | ₩	₩ 13,163
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,316.3	1,316.3
Derivative Counterparty	HSBC	HSBC
Contract date	Nov. 09, 2022	Nov. 09, 2022
Maturity date	Jan. 30, 2023	Jan. 30, 2023
Contract Amount Pay | ₩	₩ 42,627
Contract Amount Receive | $		$ 31,000
Contract exchange rate	1,375.05	1,375.05
Derivative Counterparty	HSBC	HSBC
Contract date	Oct. 19, 2020	Oct. 19, 2020
Maturity date	Oct. 29, 2024	Oct. 29, 2024
Contract Amount Pay | ₩	₩ 140,913
Contract Amount Receive | $		$ 125,000
Contract exchange rate	1,127.3	1,127.3
Derivative Counterparty	Busan Bank	Busan Bank
Contract date	Oct. 25, 2022	Oct. 25, 2022
Maturity date	Jan. 13, 2023	Jan. 13, 2023
Contract Amount Pay | ₩	₩ 13,039
Contract Amount Receive | $		$ 9,090
Contract exchange rate	1,434.5	1,434.5
Derivative Counterparty	MUFG	MUFG
Contract date	Oct. 25, 2022	Oct. 25, 2022
Maturity date	Jan. 13, 2023	Jan. 13, 2023
Contract Amount Pay | ₩	₩ 1,433
Contract Amount Receive | $		$ 1,000
Contract exchange rate	1,433.18	1,433.18
Derivative Counterparty	Woori Bank	Woori Bank
Contract date	Nov. 08, 2022	Nov. 08, 2022
Maturity date	Feb. 03, 2023	Feb. 03, 2023
Contract Amount Pay | ₩	₩ 12,332
Contract Amount Receive | $		$ 8,918
Contract exchange rate	1,382.8	1,382.8
Derivative Counterparty	Shinhan Bank	Shinhan Bank
Contract date	Nov. 09, 2022	Nov. 09, 2022
Maturity date	Mar. 03, 2023	Mar. 03, 2023
Contract Amount Pay | ₩	₩ 13,605
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,360.5	1,360.5
Derivative Counterparty	MUFG	MUFG
Contract date	Nov. 10, 2022	Nov. 10, 2022
Maturity date	Mar. 03, 2023	Mar. 03, 2023
Contract Amount Pay | ₩	₩ 20,464
Contract Amount Receive | $		$ 15,000
Contract exchange rate	1,364.27	1,364.27
Derivative Counterparty	Standard Chartered	Standard Chartered
Contract date	Nov. 24, 2022	Nov. 24, 2022
Maturity date	Apr. 07, 2023	Apr. 07, 2023
Contract Amount Pay | ₩	₩ 17,612
Contract Amount Receive | $		$ 13,214
Contract exchange rate	1,332.8	1,332.8
Derivative Counterparty	Standard Chartered	Standard Chartered
Contract date	Dec. 01, 2022	Dec. 01, 2022
Maturity date	May 12, 2023	May 12, 2023
Contract Amount Pay | ₩	₩ 12,932
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,293.2	1,293.2
Derivative Counterparty	Standard Chartered	Standard Chartered
Contract date	Dec. 05, 2022	Dec. 05, 2022
Maturity date	May 12, 2023	May 12, 2023
Contract Amount Pay | ₩	₩ 3,121
Contract Amount Receive | $		$ 2,425
Contract exchange rate	1,286.9	1,286.9
Derivative Counterparty	Woori Bank	Woori Bank
Contract date	Dec. 08, 2022	Dec. 08, 2022
Maturity date	May 12, 2023	May 12, 2023
Contract Amount Pay | ₩	₩ 13,145
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,314.5	1,314.5
Derivative Counterparty	HSBC	HSBC
Contract date	Dec. 12, 2022	Dec. 12, 2022
Maturity date	Jun. 09, 2023	Jun. 09, 2023
Contract Amount Pay | ₩	₩ 19,482
Contract Amount Receive | $		$ 15,000
Contract exchange rate	1,298.8	1,298.8
Derivative Counterparty	Busan Bank	Busan Bank
Contract date	Dec. 12, 2022	Dec. 12, 2022
Maturity date	Jun. 09, 2023	Jun. 09, 2023
Contract Amount Pay | ₩	₩ 19,479
Contract Amount Receive | $		$ 15,000
Contract exchange rate	1,298.6	1,298.6
Derivative Counterparty	MUFG	MUFG
Contract date	Dec. 15, 2022	Dec. 15, 2022
Maturity date	Jun. 09, 2023	Jun. 09, 2023
Contract Amount Pay | ₩	₩ 19,386
Contract Amount Receive | $		$ 15,000
Contract exchange rate	1,292.41	1,292.41
Derivative Counterparty	Shinhan Bank	Shinhan Bank
Contract date	Dec. 15, 2022	Dec. 15, 2022
Maturity date	Jun. 09, 2023	Jun. 09, 2023
Contract Amount Pay | ₩	₩ 19,397
Contract Amount Receive | $		$ 15,000
Contract exchange rate	1,293.1	1,293.1
Derivative Counterparty	Standard Chartered	Standard Chartered
Contract date	Dec. 15, 2022	Dec. 15, 2022
Maturity date	Jun. 09, 2023	Jun. 09, 2023
Contract Amount Pay | ₩	₩ 19,397
Contract Amount Receive | $		$ 15,000
Contract exchange rate	1,293.1	1,293.1
Derivative Counterparty	HSBC	HSBC
Contract date	Dec. 22, 2022	Dec. 22, 2022
Maturity date	Jun. 09, 2023	Jun. 09, 2023
Contract Amount Pay | ₩	₩ 12,695
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,269.45	1,269.45
Derivative Counterparty	Shinhan Bank	Shinhan Bank
Contract date	Dec. 22, 2022	Dec. 22, 2022
Maturity date	Jun. 09, 2023	Jun. 09, 2023
Contract Amount Pay | ₩	₩ 12,671
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,267.1	1,267.1

Derivatives - Summary of Deri_2

Derivatives - Summary of Derivative Currency Swap Contract List (Details) - 12 months ended Dec. 31, 2022 - Currency swap contracts € in Thousands, kr in Thousands, SFr in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, ₩ in Millions	KRW (₩)	USD ($)	HKD ($)	CHF (SFr)	AUD ($)	EUR (€)	SEK (kr)
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered	Standard Chartered
Derivative, Term of Contract	2014~2029	2014~2029	2014~2029	2014~2029	2014~2029	2014~2029	2014~2029
Contract Amount Pay	₩ 102,470
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	3.14	3.14	3.14	3.14	3.14	3.14	3.14
Contract Interest rate Receive	3.57	3.57	3.57	3.57	3.57	3.57	3.57
Contract exchange rate	1,024.7	1,024.7	1,024.7	1,024.7	1,024.7	1,024.7	1,024.7
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Societe Generale	Societe Generale	Societe Generale	Societe Generale	Societe Generale	Societe Generale	Societe Generale
Derivative, Term of Contract	2014~2024	2014~2024	2014~2024	2014~2024	2014~2024	2014~2024	2014~2024
Contract Amount Pay	₩ 105,017
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	4.92	4.92	4.92	4.92	4.92	4.92	4.92
Contract Interest rate Receive	5.13	5.13	5.13	5.13	5.13	5.13	5.13
Contract exchange rate	1,050.17	1,050.17	1,050.17	1,050.17	1,050.17	1,050.17	1,050.17
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Derivative, Term of Contract	2015~2024	2015~2024	2015~2024	2015~2024	2015~2024	2015~2024	2015~2024
Contract Amount Pay	₩ 107,970
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	4.75	4.75	4.75	4.75	4.75	4.75	4.75
Contract Interest rate Receive	5.13	5.13	5.13	5.13	5.13	5.13	5.13
Contract exchange rate	1,079.7	1,079.7	1,079.7	1,079.7	1,079.7	1,079.7	1,079.7
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Credit Agricole	Credit Agricole	Credit Agricole	Credit Agricole	Credit Agricole	Credit Agricole	Credit Agricole
Derivative, Term of Contract	2015~2024	2015~2024	2015~2024	2015~2024	2015~2024	2015~2024	2015~2024
Contract Amount Pay	₩ 94,219
Contract Amount Receive | $		$ 86,920
Contract Interest rate Pay	4.85	4.85	4.85	4.85	4.85	4.85	4.85
Contract Interest rate Receive	5.13	5.13	5.13	5.13	5.13	5.13	5.13
Contract exchange rate	1,083.97	1,083.97	1,083.97	1,083.97	1,083.97	1,083.97	1,083.97
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank
Derivative, Term of Contract	2019~2027	2019~2027	2019~2027	2019~2027	2019~2027	2019~2027	2019~2027
Contract Amount Pay	₩ 21,708
Contract Amount Receive | $		$ 19,417
Contract Interest rate Pay	5.04	5.04	5.04	5.04	5.04	5.04	5.04
Contract Interest rate Receive	6.75	6.75	6.75	6.75	6.75	6.75	6.75
Contract exchange rate	1,118	1,118	1,118	1,118	1,118	1,118	1,118
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank
Derivative, Term of Contract	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024
Contract Amount Pay	₩ 296,000
Contract Amount Receive | $		$ 250,000
Contract Interest rate Pay	1.21	1.21	1.21	1.21	1.21	1.21	1.21
Contract Interest rate Receive	2.50	2.50	2.50	2.50	2.50	2.50	2.50
Contract exchange rate	1,184	1,184	1,184	1,184	1,184	1,184	1,184
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Derivative, Term of Contract	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024
Contract Amount Pay	₩ 177,600
Contract Amount Receive | $		$ 150,000
Contract Interest rate Pay	1.24	1.24	1.24	1.24	1.24	1.24	1.24
Contract Interest rate Receive	2.50	2.50	2.50	2.50	2.50	2.50	2.50
Contract exchange rate	1,184	1,184	1,184	1,184	1,184	1,184	1,184
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Derivative, Term of Contract	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024
Contract Amount Pay	₩ 118,400
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	1.24	1.24	1.24	1.24	1.24	1.24	1.24
Contract Interest rate Receive	2.50	2.50	2.50	2.50	2.50	2.50	2.50
Contract exchange rate	1,184	1,184	1,184	1,184	1,184	1,184	1,184
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank
Derivative, Term of Contract	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025
Contract Amount Pay	₩ 241,320
Contract Amount Receive | $		$ 200,000
Contract Interest rate Pay	0.54	0.54	0.54	0.54	0.54	0.54	0.54
Contract Interest rate Receive	1.13	1.13	1.13	1.13	1.13	1.13	1.13
Contract exchange rate	1,206.6	1,206.6	1,206.6	1,206.6	1,206.6	1,206.6	1,206.6
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Derivative, Term of Contract	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025
Contract Amount Pay	₩ 241,320
Contract Amount Receive | $		$ 200,000
Contract Interest rate Pay	0.54	0.54	0.54	0.54	0.54	0.54	0.54
Contract Interest rate Receive	1.13	1.13	1.13	1.13	1.13	1.13	1.13
Contract exchange rate	1,206.6	1,206.6	1,206.6	1,206.6	1,206.6	1,206.6	1,206.6
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank
Derivative, Term of Contract	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025
Contract Amount Pay	₩ 120,660
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	0.54	0.54	0.54	0.54	0.54	0.54	0.54
Contract Interest rate Receive	1.13	1.13	1.13	1.13	1.13	1.13	1.13
Contract exchange rate	1,206.6	1,206.6	1,206.6	1,206.6	1,206.6	1,206.6	1,206.6
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank
Derivative, Term of Contract	2020~2026	2020~2026	2020~2026	2020~2026	2020~2026	2020~2026	2020~2026
Contract Amount Pay	₩ 76,355
Contract Amount Receive | $		$ 70,445
Contract Interest rate Pay	5.83	5.83	5.83	5.83	5.83	5.83	5.83
Contract Interest rate Receive	6.00	6.00	6.00	6.00	6.00	6.00	6.00
Contract exchange rate	1,083.9	1,083.9	1,083.9	1,083.9	1,083.9	1,083.9	1,083.9
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank
Derivative, Term of Contract	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026
Contract Amount Pay	₩ 118,170
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	1.11	1.11	1.11	1.11	1.11	1.11	1.11
Contract Interest rate Receive	1.13	1.13	1.13	1.13	1.13	1.13	1.13
Contract exchange rate	1,181.7	1,181.7	1,181.7	1,181.7	1,181.7	1,181.7	1,181.7
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Derivative, Term of Contract	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026
Contract Amount Pay	₩ 118,170
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	1.11	1.11	1.11	1.11	1.11	1.11	1.11
Contract Interest rate Receive	1.13	1.13	1.13	1.13	1.13	1.13	1.13
Contract exchange rate	1,181.7	1,181.7	1,181.7	1,181.7	1,181.7	1,181.7	1,181.7
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Derivative, Term of Contract	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026
Contract Amount Pay	₩ 118,170
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	1.11	1.11	1.11	1.11	1.11	1.11	1.11
Contract Interest rate Receive	1.13	1.13	1.13	1.13	1.13	1.13	1.13
Contract exchange rate	1,181.7	1,181.7	1,181.7	1,181.7	1,181.7	1,181.7	1,181.7
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Derivative, Term of Contract	2022~2025	2022~2025	2022~2025	2022~2025	2022~2025	2022~2025	2022~2025
Contract Amount Pay	₩ 385,800
Contract Amount Receive | $		$ 300,000
Contract Interest rate Pay	3.11	3.11	3.11	3.11	3.11	3.11	3.11
Contract Interest rate Receive	3.63	3.63	3.63	3.63	3.63	3.63	3.63
Contract exchange rate	1,286	1,286	1,286	1,286	1,286	1,286	1,286
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank
Derivative, Term of Contract	2022~2025	2022~2025	2022~2025	2022~2025	2022~2025	2022~2025	2022~2025
Contract Amount Pay	₩ 257,200
Contract Amount Receive | $		$ 200,000
Contract Interest rate Pay	3.12	3.12	3.12	3.12	3.12	3.12	3.12
Contract Interest rate Receive	3.63	3.63	3.63	3.63	3.63	3.63	3.63
Contract exchange rate	1,286	1,286	1,286	1,286	1,286	1,286	1,286
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	JP Morgan	JP Morgan	JP Morgan	JP Morgan	JP Morgan	JP Morgan	JP Morgan
Derivative, Term of Contract	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027
Contract Amount Pay	₩ 128,600
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	3.56	3.56	3.56	3.56	3.56	3.56	3.56
Contract Interest rate Receive	4.00	4.00	4.00	4.00	4.00	4.00	4.00
Contract exchange rate	1,286	1,286	1,286	1,286	1,286	1,286	1,286
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank
Derivative, Term of Contract	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027
Contract Amount Pay	₩ 128,600
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	3.56	3.56	3.56	3.56	3.56	3.56	3.56
Contract Interest rate Receive	4.00	4.00	4.00	4.00	4.00	4.00	4.00
Contract exchange rate	1,286	1,286	1,286	1,286	1,286	1,286	1,286
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank
Derivative, Term of Contract	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027
Contract Amount Pay	₩ 128,600
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	3.56	3.56	3.56	3.56	3.56	3.56	3.56
Contract Interest rate Receive	4.00	4.00	4.00	4.00	4.00	4.00	4.00
Contract exchange rate	1,286	1,286	1,286	1,286	1,286	1,286	1,286
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Derivative, Term of Contract	2022~2026	2022~2026	2022~2026	2022~2026	2022~2026	2022~2026	2022~2026
Contract Amount Pay	₩ 283,820
Contract Amount Receive | $		$ 200,000
Contract Interest rate Pay	4.67	4.67	4.67	4.67	4.67	4.67	4.67
Contract Interest rate Receive	5.38	5.38	5.38	5.38	5.38	5.38	5.38
Contract exchange rate	1,419.1	1,419.1	1,419.1	1,419.1	1,419.1	1,419.1	1,419.1
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Derivative, Term of Contract	2022~2026	2022~2026	2022~2026	2022~2026	2022~2026	2022~2026	2022~2026
Contract Amount Pay	₩ 141,910
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	4.68	4.68	4.68	4.68	4.68	4.68	4.68
Contract Interest rate Receive	5.38	5.38	5.38	5.38	5.38	5.38	5.38
Contract exchange rate	1,419.1	1,419.1	1,419.1	1,419.1	1,419.1	1,419.1	1,419.1
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	JP Morgan	JP Morgan	JP Morgan	JP Morgan	JP Morgan	JP Morgan	JP Morgan
Derivative, Term of Contract	2022~2026	2022~2026	2022~2026	2022~2026	2022~2026	2022~2026	2022~2026
Contract Amount Pay	₩ 141,910
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	4.69	4.69	4.69	4.69	4.69	4.69	4.69
Contract Interest rate Receive	5.38	5.38	5.38	5.38	5.38	5.38	5.38
Contract exchange rate	1,419.1	1,419.1	1,419.1	1,419.1	1,419.1	1,419.1	1,419.1
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank
Derivative, Term of Contract	2022~2026	2022~2026	2022~2026	2022~2026	2022~2026	2022~2026	2022~2026
Contract Amount Pay	₩ 141,910
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	4.69	4.69	4.69	4.69	4.69	4.69	4.69
Contract Interest rate Receive	5.38	5.38	5.38	5.38	5.38	5.38	5.38
Contract exchange rate	1,419.1	1,419.1	1,419.1	1,419.1	1,419.1	1,419.1	1,419.1
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Derivative, Term of Contract	2022~2028	2022~2028	2022~2028	2022~2028	2022~2028	2022~2028	2022~2028
Contract Amount Pay	₩ 283,820
Contract Amount Receive | $		$ 200,000
Contract Interest rate Pay	5.12	5.12	5.12	5.12	5.12	5.12	5.12
Contract Interest rate Receive	5.50	5.50	5.50	5.50	5.50	5.50	5.50
Contract exchange rate	1,419.1	1,419.1	1,419.1	1,419.1	1,419.1	1,419.1	1,419.1
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank
Derivative, Term of Contract	2022~2028	2022~2028	2022~2028	2022~2028	2022~2028	2022~2028	2022~2028
Contract Amount Pay	₩ 141,910
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	5.13	5.13	5.13	5.13	5.13	5.13	5.13
Contract Interest rate Receive	5.50	5.50	5.50	5.50	5.50	5.50	5.50
Contract exchange rate	1,419.1	1,419.1	1,419.1	1,419.1	1,419.1	1,419.1	1,419.1
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Nomura	Nomura	Nomura	Nomura	Nomura	Nomura	Nomura
Derivative, Term of Contract	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025
Contract Amount Pay	₩ 111,190
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	2.60	2.60	2.60	2.60	2.60	2.60	2.60
Contract Interest rate Receive	3.25	3.25	3.25	3.25	3.25	3.25	3.25
Contract exchange rate	1,111.9	1,111.9	1,111.9	1,111.9	1,111.9	1,111.9	1,111.9
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Derivative, Term of Contract	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025
Contract Amount Pay	₩ 111,190
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	2.62	2.62	2.62	2.62	2.62	2.62	2.62
Contract Interest rate Receive	3.25	3.25	3.25	3.25	3.25	3.25	3.25
Contract exchange rate	1,111.9	1,111.9	1,111.9	1,111.9	1,111.9	1,111.9	1,111.9
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank
Derivative, Term of Contract	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025
Contract Amount Pay	₩ 55,595
Contract Amount Receive | $		$ 50,000
Contract Interest rate Pay	2.62	2.62	2.62	2.62	2.62	2.62	2.62
Contract Interest rate Receive	3.25	3.25	3.25	3.25	3.25	3.25	3.25
Contract exchange rate	1,111.9	1,111.9	1,111.9	1,111.9	1,111.9	1,111.9	1,111.9
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Derivative, Term of Contract	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025
Contract Amount Pay	₩ 55,595
Contract Amount Receive | $		$ 50,000
Contract Interest rate Pay	2.62	2.62	2.62	2.62	2.62	2.62	2.62
Contract Interest rate Receive	3.25	3.25	3.25	3.25	3.25	3.25	3.25
Contract exchange rate	1,111.9	1,111.9	1,111.9	1,111.9	1,111.9	1,111.9	1,111.9
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank
Derivative, Term of Contract	2017~2027	2017~2027	2017~2027	2017~2027	2017~2027	2017~2027	2017~2027
Contract Amount Pay	₩ 111,610
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	2.25	2.25	2.25	2.25	2.25	2.25	2.25
Contract Interest rate Receive	3.13	3.13	3.13	3.13	3.13	3.13	3.13
Contract exchange rate	1,116.1	1,116.1	1,116.1	1,116.1	1,116.1	1,116.1	1,116.1
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Derivative, Term of Contract	2017~2027	2017~2027	2017~2027	2017~2027	2017~2027	2017~2027	2017~2027
Contract Amount Pay	₩ 111,610
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	2.31	2.31	2.31	2.31	2.31	2.31	2.31
Contract Interest rate Receive	3.13	3.13	3.13	3.13	3.13	3.13	3.13
Contract exchange rate	1,116.1	1,116.1	1,116.1	1,116.1	1,116.1	1,116.1	1,116.1
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Derivative, Term of Contract	2017~2027	2017~2027	2017~2027	2017~2027	2017~2027	2017~2027	2017~2027
Contract Amount Pay	₩ 111,610
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	2.31	2.31	2.31	2.31	2.31	2.31	2.31
Contract Interest rate Receive	3.13	3.13	3.13	3.13	3.13	3.13	3.13
Contract exchange rate	1,116.1	1,116.1	1,116.1	1,116.1	1,116.1	1,116.1	1,116.1
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Derivative, Term of Contract	2018~2028	2018~2028	2018~2028	2018~2028	2018~2028	2018~2028	2018~2028
Contract Amount Pay	₩ 108,600
Contract Amount Receive | $			$ 800,000
Contract Interest rate Pay	2.69	2.69	2.69	2.69	2.69	2.69	2.69
Contract Interest rate Receive	3.35	3.35	3.35	3.35	3.35	3.35	3.35
Contract exchange rate	135.75	135.75	135.75	135.75	135.75	135.75	135.75
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank
Derivative, Term of Contract	2018~2028	2018~2028	2018~2028	2018~2028	2018~2028	2018~2028	2018~2028
Contract Amount Pay	₩ 115,387
Contract Amount Receive | $			$ 850,000
Contract Interest rate Pay	2.66	2.66	2.66	2.66	2.66	2.66	2.66
Contract Interest rate Receive	3.35	3.35	3.35	3.35	3.35	3.35	3.35
Contract exchange rate	135.75	135.75	135.75	135.75	135.75	135.75	135.75
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Derivative, Term of Contract	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023
Contract Amount Pay	₩ 170,280
Contract Amount Receive | $		$ 150,000
Contract Interest rate Pay	2.15	2.15	2.15	2.15	2.15	2.15	2.15
Contract Interest rate Receive	3.75	3.75	3.75	3.75	3.75	3.75	3.75
Contract exchange rate	1,135.2	1,135.2	1,135.2	1,135.2	1,135.2	1,135.2	1,135.2
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank
Derivative, Term of Contract	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023
Contract Amount Pay	₩ 170,280
Contract Amount Receive | $		$ 150,000
Contract Interest rate Pay	2.18	2.18	2.18	2.18	2.18	2.18	2.18
Contract Interest rate Receive	3.75	3.75	3.75	3.75	3.75	3.75	3.75
Contract exchange rate	1,135.2	1,135.2	1,135.2	1,135.2	1,135.2	1,135.2	1,135.2
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Derivative, Term of Contract	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023
Contract Amount Pay	₩ 113,520
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	2.17	2.17	2.17	2.17	2.17	2.17	2.17
Contract Interest rate Receive	3.75	3.75	3.75	3.75	3.75	3.75	3.75
Contract exchange rate	1,135.2	1,135.2	1,135.2	1,135.2	1,135.2	1,135.2	1,135.2
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank
Derivative, Term of Contract	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023
Contract Amount Pay	₩ 227,040
Contract Amount Receive | $		$ 200,000
Contract Interest rate Pay	2.17	2.17	2.17	2.17	2.17	2.17	2.17
Contract Interest rate Receive	3.75	3.75	3.75	3.75	3.75	3.75	3.75
Contract exchange rate	1,135.2	1,135.2	1,135.2	1,135.2	1,135.2	1,135.2	1,135.2
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Citi Bank	Korea Citi Bank	Korea Citi Bank	Korea Citi Bank	Korea Citi Bank	Korea Citi Bank	Korea Citi Bank
Derivative, Term of Contract	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024
Contract Amount Pay	₩ 239,956
Contract Amount Receive | SFr				SFr 200,000
Contract Interest rate Pay	1.44	1.44	1.44	1.44	1.44	1.44	1.44
Contract Interest rate Receive	0.00	0.00	0.00	0.00	0.00	0.00	0.00
Contract exchange rate	1,199.78	1,199.78	1,199.78	1,199.78	1,199.78	1,199.78	1,199.78
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Derivative, Term of Contract	2019~2027	2019~2027	2019~2027	2019~2027	2019~2027	2019~2027	2019~2027
Contract Amount Pay	₩ 119,978
Contract Amount Receive | SFr				SFr 100,000
Contract Interest rate Pay	1.43	1.43	1.43	1.43	1.43	1.43	1.43
Contract Interest rate Receive	0.05	0.05	0.05	0.05	0.05	0.05	0.05
Contract exchange rate	1,199.78	1,199.78	1,199.78	1,199.78	1,199.78	1,199.78	1,199.78
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank
Derivative, Term of Contract	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026
Contract Amount Pay	₩ 222,800
Contract Amount Receive | $		$ 200,000
Contract Interest rate Pay	0.93	0.93	0.93	0.93	0.93	0.93	0.93
Contract Interest rate Receive	1.25	1.25	1.25	1.25	1.25	1.25	1.25
Contract exchange rate	1,114	1,114	1,114	1,114	1,114	1,114	1,114
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank
Derivative, Term of Contract	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026
Contract Amount Pay	₩ 111,400
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	0.92	0.92	0.92	0.92	0.92	0.92	0.92
Contract Interest rate Receive	1.25	1.25	1.25	1.25	1.25	1.25	1.25
Contract exchange rate	1,114	1,114	1,114	1,114	1,114	1,114	1,114
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Derivative, Term of Contract	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026
Contract Amount Pay	₩ 111,400
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	0.93	0.93	0.93	0.93	0.93	0.93	0.93
Contract Interest rate Receive	1.25	1.25	1.25	1.25	1.25	1.25	1.25
Contract exchange rate	1,114	1,114	1,114	1,114	1,114	1,114	1,114
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Nonghyup Bank	Nonghyup Bank	Nonghyup Bank	Nonghyup Bank	Nonghyup Bank	Nonghyup Bank	Nonghyup Bank
Derivative, Term of Contract	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026
Contract Amount Pay	₩ 111,400
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	0.93	0.93	0.93	0.93	0.93	0.93	0.93
Contract Interest rate Receive	1.25	1.25	1.25	1.25	1.25	1.25	1.25
Contract exchange rate	1,114	1,114	1,114	1,114	1,114	1,114	1,114
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank
Derivative, Term of Contract	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027
Contract Amount Pay	₩ 262,000
Contract Amount Receive | $		$ 200,000
Contract Interest rate Pay	3.62	3.62	3.62	3.62	3.62	3.62	3.62
Contract Interest rate Receive	4.25	4.25	4.25	4.25	4.25	4.25	4.25
Contract exchange rate	1,310	1,310	1,310	1,310	1,310	1,310	1,310
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Export-Import Bank of Korea	Export-Import Bank of Korea	Export-Import Bank of Korea	Export-Import Bank of Korea	Export-Import Bank of Korea	Export-Import Bank of Korea	Export-Import Bank of Korea
Derivative, Term of Contract	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027
Contract Amount Pay	₩ 131,000
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	3.63	3.63	3.63	3.63	3.63	3.63	3.63
Contract Interest rate Receive	4.25	4.25	4.25	4.25	4.25	4.25	4.25
Contract exchange rate	1,310	1,310	1,310	1,310	1,310	1,310	1,310
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank
Derivative, Term of Contract	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027
Contract Amount Pay	₩ 131,000
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	3.62	3.62	3.62	3.62	3.62	3.62	3.62
Contract Interest rate Receive	4.25	4.25	4.25	4.25	4.25	4.25	4.25
Contract exchange rate	1,310	1,310	1,310	1,310	1,310	1,310	1,310
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Derivative, Term of Contract	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027
Contract Amount Pay	₩ 131,000
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	3.61	3.61	3.61	3.61	3.61	3.61	3.61
Contract Interest rate Receive	4.25	4.25	4.25	4.25	4.25	4.25	4.25
Contract exchange rate	1,310	1,310	1,310	1,310	1,310	1,310	1,310
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Derivative, Term of Contract	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027
Contract Amount Pay	₩ 262,000
Contract Amount Receive | $		$ 200,000
Contract Interest rate Pay	3.63	3.63	3.63	3.63	3.63	3.63	3.63
Contract Interest rate Receive	4.25	4.25	4.25	4.25	4.25	4.25	4.25
Contract exchange rate	1,310	1,310	1,310	1,310	1,310	1,310	1,310
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Export-Import Bank of Korea	Export-Import Bank of Korea	Export-Import Bank of Korea	Export-Import Bank of Korea	Export-Import Bank of Korea	Export-Import Bank of Korea	Export-Import Bank of Korea
Derivative, Term of Contract	2022~2032	2022~2032	2022~2032	2022~2032	2022~2032	2022~2032	2022~2032
Contract Amount Pay	₩ 349,829
Contract Amount Receive | $			$ 1,935,000
Contract Interest rate Pay	4.87	4.87	4.87	4.87	4.87	4.87	4.87
Contract Interest rate Receive	5.16	5.16	5.16	5.16	5.16	5.16	5.16
Contract exchange rate	180.79	180.79	180.79	180.79	180.79	180.79	180.79
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	JP Morgan	JP Morgan	JP Morgan	JP Morgan	JP Morgan	JP Morgan	JP Morgan
Derivative, Term of Contract	2022~2032	2022~2032	2022~2032	2022~2032	2022~2032	2022~2032	2022~2032
Contract Amount Pay	₩ 75,194
Contract Amount Receive | $			$ 415,000
Contract Interest rate Pay	5.00	5.00	5.00	5.00	5.00	5.00	5.00
Contract Interest rate Receive	5.16	5.16	5.16	5.16	5.16	5.16	5.16
Contract exchange rate	181.19	181.19	181.19	181.19	181.19	181.19	181.19
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	HSBC	HSBC	HSBC	HSBC	HSBC	HSBC	HSBC
Derivative, Term of Contract	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024
Contract Amount Pay | $		$ 205,500
Contract Amount Receive | $					$ 300,000
Contract Interest rate Pay	3M Libor + 0.78	3M Libor + 0.78	3M Libor + 0.78	3M Libor + 0.78	3M Libor + 0.78	3M Libor + 0.78	3M Libor + 0.78
Contract Interest rate Receive	3M BBSW + 0.97	3M BBSW + 0.97	3M BBSW + 0.97	3M BBSW + 0.97	3M BBSW + 0.97	3M BBSW + 0.97	3M BBSW + 0.97
Contract exchange rate	0.69	0.69	0.69	0.69	0.69	0.69	0.69
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank
Derivative, Term of Contract	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025
Contract Amount Pay	₩ 118,780
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	1.29	1.29	1.29	1.29	1.29	1.29	1.29
Contract Interest rate Receive	2.13	2.13	2.13	2.13	2.13	2.13	2.13
Contract exchange rate	1,187.8	1,187.8	1,187.8	1,187.8	1,187.8	1,187.8	1,187.8
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank
Derivative, Term of Contract	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025
Contract Amount Pay	₩ 118,780
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	1.29	1.29	1.29	1.29	1.29	1.29	1.29
Contract Interest rate Receive	2.13	2.13	2.13	2.13	2.13	2.13	2.13
Contract exchange rate	1,187.8	1,187.8	1,187.8	1,187.8	1,187.8	1,187.8	1,187.8
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Derivative, Term of Contract	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025
Contract Amount Pay	₩ 118,780
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	1.29	1.29	1.29	1.29	1.29	1.29	1.29
Contract Interest rate Receive	2.13	2.13	2.13	2.13	2.13	2.13	2.13
Contract exchange rate	1,187.8	1,187.8	1,187.8	1,187.8	1,187.8	1,187.8	1,187.8
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Derivative, Term of Contract	2020~2026	2020~2026	2020~2026	2020~2026	2020~2026	2020~2026	2020~2026
Contract Amount Pay	₩ 118,910
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	0.61	0.61	0.61	0.61	0.61	0.61	0.61
Contract Interest rate Receive	1.00	1.00	1.00	1.00	1.00	1.00	1.00
Contract exchange rate	1,189.1	1,189.1	1,189.1	1,189.1	1,189.1	1,189.1	1,189.1
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Derivative, Term of Contract	2020~2026	2020~2026	2020~2026	2020~2026	2020~2026	2020~2026	2020~2026
Contract Amount Pay	₩ 118,910
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	0.61	0.61	0.61	0.61	0.61	0.61	0.61
Contract Interest rate Receive	1.00	1.00	1.00	1.00	1.00	1.00	1.00
Contract exchange rate	1,189.1	1,189.1	1,189.1	1,189.1	1,189.1	1,189.1	1,189.1
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank
Derivative, Term of Contract	2020~2026	2020~2026	2020~2026	2020~2026	2020~2026	2020~2026	2020~2026
Contract Amount Pay	₩ 118,910
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	0.62	0.62	0.62	0.62	0.62	0.62	0.62
Contract Interest rate Receive	1.00	1.00	1.00	1.00	1.00	1.00	1.00
Contract exchange rate	1,189.1	1,189.1	1,189.1	1,189.1	1,189.1	1,189.1	1,189.1
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Nomura	Nomura	Nomura	Nomura	Nomura	Nomura	Nomura
Derivative, Term of Contract	2017~2037	2017~2037	2017~2037	2017~2037	2017~2037	2017~2037	2017~2037
Contract Amount Pay	₩ 52,457
Contract Amount Receive | €						€ 40,000
Contract Interest rate Pay	2.60	2.60	2.60	2.60	2.60	2.60	2.60
Contract Interest rate Receive	1.70	1.70	1.70	1.70	1.70	1.70	1.70
Contract exchange rate	1,311.42	1,311.42	1,311.42	1,311.42	1,311.42	1,311.42	1,311.42
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Nomura	Nomura	Nomura	Nomura	Nomura	Nomura	Nomura
Derivative, Term of Contract	2017~2037	2017~2037	2017~2037	2017~2037	2017~2037	2017~2037	2017~2037
Contract Amount Pay	₩ 59,423
Contract Amount Receive | kr							kr 450,000
Contract Interest rate Pay	2.62	2.62	2.62	2.62	2.62	2.62	2.62
Contract Interest rate Receive	2.36	2.36	2.36	2.36	2.36	2.36	2.36
Contract exchange rate	132.05	132.05	132.05	132.05	132.05	132.05	132.05
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank
Derivative, Term of Contract	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026
Contract Amount Pay	₩ 114,230
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	1.27	1.27	1.27	1.27	1.27	1.27	1.27
Contract Interest rate Receive	1.25	1.25	1.25	1.25	1.25	1.25	1.25
Contract exchange rate	1,142.3	1,142.3	1,142.3	1,142.3	1,142.3	1,142.3	1,142.3
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Derivative, Term of Contract	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026
Contract Amount Pay	₩ 114,230
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	1.27	1.27	1.27	1.27	1.27	1.27	1.27
Contract Interest rate Receive	1.25	1.25	1.25	1.25	1.25	1.25	1.25
Contract exchange rate	1,142.3	1,142.3	1,142.3	1,142.3	1,142.3	1,142.3	1,142.3
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Derivative, Term of Contract	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026
Contract Amount Pay	₩ 114,230
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	1.27	1.27	1.27	1.27	1.27	1.27	1.27
Contract Interest rate Receive	1.25	1.25	1.25	1.25	1.25	1.25	1.25
Contract exchange rate	1,142.3	1,142.3	1,142.3	1,142.3	1,142.3	1,142.3	1,142.3
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Derivative, Term of Contract	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027
Contract Amount Pay	₩ 123,710
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	3.41	3.41	3.41	3.41	3.41	3.41	3.41
Contract Interest rate Receive	3.63	3.63	3.63	3.63	3.63	3.63	3.63
Contract exchange rate	1,237.1	1,237.1	1,237.1	1,237.1	1,237.1	1,237.1	1,237.1
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank
Derivative, Term of Contract	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027
Contract Amount Pay	₩ 123,710
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	3.41	3.41	3.41	3.41	3.41	3.41	3.41
Contract Interest rate Receive	3.63	3.63	3.63	3.63	3.63	3.63	3.63
Contract exchange rate	1,237.1	1,237.1	1,237.1	1,237.1	1,237.1	1,237.1	1,237.1
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	JP Morgan	JP Morgan	JP Morgan	JP Morgan	JP Morgan	JP Morgan	JP Morgan
Derivative, Term of Contract	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027	2022~2027
Contract Amount Pay	₩ 123,710
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	3.41	3.41	3.41	3.41	3.41	3.41	3.41
Contract Interest rate Receive	3.63	3.63	3.63	3.63	3.63	3.63	3.63
Contract exchange rate	1,237.1	1,237.1	1,237.1	1,237.1	1,237.1	1,237.1	1,237.1
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Derivative, Term of Contract	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023
Contract Amount Pay	₩ 320,880
Contract Amount Receive | $		$ 300,000
Contract Interest rate Pay	2.03	2.03	2.03	2.03	2.03	2.03	2.03
Contract Interest rate Receive	3.75	3.75	3.75	3.75	3.75	3.75	3.75
Contract exchange rate	1,069.6	1,069.6	1,069.6	1,069.6	1,069.6	1,069.6	1,069.6
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	BNP Paribas	BNP Paribas	BNP Paribas	BNP Paribas	BNP Paribas	BNP Paribas	BNP Paribas
Derivative, Term of Contract	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024
Contract Amount Pay	₩ 111,841
Contract Amount Receive | SFr				SFr 100,000
Contract Interest rate Pay	1.78	1.78	1.78	1.78	1.78	1.78	1.78
Contract Interest rate Receive	0.13	0.13	0.13	0.13	0.13	0.13	0.13
Contract exchange rate	1,118.41	1,118.41	1,118.41	1,118.41	1,118.41	1,118.41	1,118.41
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank
Derivative, Term of Contract	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024
Contract Amount Pay	₩ 111,841
Contract Amount Receive | SFr				SFr 100,000
Contract Interest rate Pay	1.78	1.78	1.78	1.78	1.78	1.78	1.78
Contract Interest rate Receive	0.13	0.13	0.13	0.13	0.13	0.13	0.13
Contract exchange rate	1,118.41	1,118.41	1,118.41	1,118.41	1,118.41	1,118.41	1,118.41
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Derivative, Term of Contract	2022~2025	2022~2025	2022~2025	2022~2025	2022~2025	2022~2025	2022~2025
Contract Amount Pay	₩ 128,560
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	3.37	3.37	3.37	3.37	3.37	3.37	3.37
Contract Interest rate Receive	4.13	4.13	4.13	4.13	4.13	4.13	4.13
Contract exchange rate	1,285.6	1,285.6	1,285.6	1,285.6	1,285.6	1,285.6	1,285.6
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank
Derivative, Term of Contract	2022~2025	2022~2025	2022~2025	2022~2025	2022~2025	2022~2025	2022~2025
Contract Amount Pay	₩ 128,560
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	3.37	3.37	3.37	3.37	3.37	3.37	3.37
Contract Interest rate Receive	4.13	4.13	4.13	4.13	4.13	4.13	4.13
Contract exchange rate	1,285.6	1,285.6	1,285.6	1,285.6	1,285.6	1,285.6	1,285.6
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank
Derivative, Term of Contract	2022~2025	2022~2025	2022~2025	2022~2025	2022~2025	2022~2025	2022~2025
Contract Amount Pay	₩ 128,560
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	3.37	3.37	3.37	3.37	3.37	3.37	3.37
Contract Interest rate Receive	4.13	4.13	4.13	4.13	4.13	4.13	4.13
Contract exchange rate	1,285.6	1,285.6	1,285.6	1,285.6	1,285.6	1,285.6	1,285.6
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank
Derivative, Term of Contract	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026
Contract Amount Pay	₩ 220,600
Contract Amount Receive | $		$ 200,000
Contract Interest rate Pay	0.47	0.47	0.47	0.47	0.47	0.47	0.47
Contract Interest rate Receive	0.75	0.75	0.75	0.75	0.75	0.75	0.75
Contract exchange rate	1,103	1,103	1,103	1,103	1,103	1,103	1,103
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank
Derivative, Term of Contract	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026
Contract Amount Pay	₩ 220,600
Contract Amount Receive | $		$ 200,000
Contract Interest rate Pay	0.47	0.47	0.47	0.47	0.47	0.47	0.47
Contract Interest rate Receive	0.75	0.75	0.75	0.75	0.75	0.75	0.75
Contract exchange rate	1,103	1,103	1,103	1,103	1,103	1,103	1,103
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Derivative, Term of Contract	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026	2021~2026
Contract Amount Pay	₩ 55,150
Contract Amount Receive | $		$ 50,000
Contract Interest rate Pay	0.48	0.48	0.48	0.48	0.48	0.48	0.48
Contract Interest rate Receive	0.75	0.75	0.75	0.75	0.75	0.75	0.75
Contract exchange rate	1,103	1,103	1,103	1,103	1,103	1,103	1,103
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Derivative, Term of Contract	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023
Contract Amount Pay	₩ 169,335
Contract Amount Receive | $		$ 150,000
Contract Interest rate Pay	2.26	2.26	2.26	2.26	2.26	2.26	2.26
Contract exchange rate	1,128.9	1,128.9	1,128.9	1,128.9	1,128.9	1,128.9	1,128.9
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank
Derivative, Term of Contract	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023
Contract Amount Pay	₩ 169,335
Contract Amount Receive | $		$ 150,000
Contract Interest rate Pay	2.26	2.26	2.26	2.26	2.26	2.26	2.26
Contract Interest rate Receive	3.88	3.88	3.88	3.88	3.88	3.88	3.88
Contract exchange rate	1,128.9	1,128.9	1,128.9	1,128.9	1,128.9	1,128.9	1,128.9
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Credit Agricole	Credit Agricole	Credit Agricole	Credit Agricole	Credit Agricole	Credit Agricole	Credit Agricole
Derivative, Term of Contract	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023
Contract Amount Pay	₩ 112,890
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	2.26	2.26	2.26	2.26	2.26	2.26	2.26
Contract Interest rate Receive	3.88	3.88	3.88	3.88	3.88	3.88	3.88
Contract exchange rate	1,128.9	1,128.9	1,128.9	1,128.9	1,128.9	1,128.9	1,128.9
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Derivative, Term of Contract	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023
Contract Amount Pay	₩ 56,445
Contract Amount Receive | $		$ 50,000
Contract Interest rate Pay	2.26	2.26	2.26	2.26	2.26	2.26	2.26
Contract Interest rate Receive	3.88	3.88	3.88	3.88	3.88	3.88	3.88
Contract exchange rate	1,128.9	1,128.9	1,128.9	1,128.9	1,128.9	1,128.9	1,128.9
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank
Derivative, Term of Contract	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023
Contract Amount Pay	₩ 56,445
Contract Amount Receive | $		$ 50,000
Contract Interest rate Pay	2.26	2.26	2.26	2.26	2.26	2.26	2.26
Contract Interest rate Receive	3.88	3.88	3.88	3.88	3.88	3.88	3.88
Contract exchange rate	1,128.9	1,128.9	1,128.9	1,128.9	1,128.9	1,128.9	1,128.9
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank
Derivative, Term of Contract	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025
Contract Amount Pay	₩ 245,560
Contract Amount Receive | $		$ 200,000
Contract Interest rate Pay	0.93	0.93	0.93	0.93	0.93	0.93	0.93
Contract Interest rate Receive	1.75	1.75	1.75	1.75	1.75	1.75	1.75
Contract exchange rate	1,227.8	1,227.8	1,227.8	1,227.8	1,227.8	1,227.8	1,227.8
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Derivative, Term of Contract	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025
Contract Amount Pay	₩ 245,560
Contract Amount Receive | $		$ 200,000
Contract Interest rate Pay	0.93	0.93	0.93	0.93	0.93	0.93	0.93
Contract Interest rate Receive	1.75	1.75	1.75	1.75	1.75	1.75	1.75
Contract exchange rate	1,227.8	1,227.8	1,227.8	1,227.8	1,227.8	1,227.8	1,227.8
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Derivative, Term of Contract	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025
Contract Amount Pay	₩ 122,780
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	0.93	0.93	0.93	0.93	0.93	0.93	0.93
Contract Interest rate Receive	1.75	1.75	1.75	1.75	1.75	1.75	1.75
Contract exchange rate	1,227.8	1,227.8	1,227.8	1,227.8	1,227.8	1,227.8	1,227.8
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	JP Morgan	JP Morgan	JP Morgan	JP Morgan	JP Morgan	JP Morgan	JP Morgan
Derivative, Term of Contract	2022~2025	2022~2025	2022~2025	2022~2025	2022~2025	2022~2025	2022~2025
Contract Amount Pay	₩ 126,180
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	2.80	2.80	2.80	2.80	2.80	2.80	2.80
Contract Interest rate Receive	3.60	3.60	3.60	3.60	3.60	3.60	3.60
Contract exchange rate	1,261.8	1,261.8	1,261.8	1,261.8	1,261.8	1,261.8	1,261.8
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Derivative, Term of Contract	2022~2025	2022~2025	2022~2025	2022~2025	2022~2025	2022~2025	2022~2025
Contract Amount Pay	₩ 126,180
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	2.80	2.80	2.80	2.80	2.80	2.80	2.80
Contract Interest rate Receive	3.60	3.60	3.60	3.60	3.60	3.60	3.60
Contract exchange rate	1,261.8	1,261.8	1,261.8	1,261.8	1,261.8	1,261.8	1,261.8
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Derivative, Term of Contract	2022~2025	2022~2025	2022~2025	2022~2025	2022~2025	2022~2025	2022~2025
Contract Amount Pay	₩ 252,360
Contract Amount Receive | $		$ 200,000
Contract Interest rate Pay	2.83	2.83	2.83	2.83	2.83	2.83	2.83
Contract Interest rate Receive	3.60	3.60	3.60	3.60	3.60	3.60	3.60
Contract exchange rate	1,261.8	1,261.8	1,261.8	1,261.8	1,261.8	1,261.8	1,261.8
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank	Woori Bank
Derivative, Term of Contract	2022~2025	2022~2025	2022~2025	2022~2025	2022~2025	2022~2025	2022~2025
Contract Amount Pay	₩ 126,180
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	2.85	2.85	2.85	2.85	2.85	2.85	2.85
Contract Interest rate Receive	3.60	3.60	3.60	3.60	3.60	3.60	3.60
Contract exchange rate	1,261.8	1,261.8	1,261.8	1,261.8	1,261.8	1,261.8	1,261.8

Derivatives - Summary of Deri_3

Derivatives - Summary of Derivative Interest Rate Swap Contract List (Details) - 12 months ended Dec. 31, 2022 $ in Thousands, $ in Thousands, ₩ in Millions		KRW (₩)	AUD ($)	USD ($)
Designated as Hedging Instrument | Interest rate swap 1 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Export-Import Bank of Korea
Derivative, Term of Contract		2015~2031
Contract Interest rate Pay		2.67%
Contract Interest rate Receive		6M USD Libor
Contract amount | $				$ 15,893
Designated as Hedging Instrument | Interest rate swap 2 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		ING Bank
Derivative, Term of Contract		2015~2031
Contract Interest rate Pay		2.67%
Contract Interest rate Receive		6M USD Libor
Contract amount | $				7,861
Designated as Hedging Instrument | Interest rate swap 3 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		BNP Paribas
Derivative, Term of Contract		2015~2031
Contract Interest rate Pay		2.67%
Contract Interest rate Receive		6M USD Libor
Contract amount | $				7,861
Designated as Hedging Instrument | Interest rate swap 4 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		BNP Paribas
Derivative, Term of Contract		2009~2027
Contract Interest rate Pay		4.16%
Contract Interest rate Receive		6M USD Libor
Contract amount | $				51,891
Designated as Hedging Instrument | Interest rate swap 5 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		KFW
Derivative, Term of Contract		2009~2027
Contract Interest rate Pay		4.16%
Contract Interest rate Receive		6M USD Libor
Contract amount | $				51,891
Designated as Hedging Instrument | Interest rate swap 6 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Export-Import Bank of Korea
Derivative, Term of Contract		2016~2036
Contract Interest rate Pay		3.00%
Contract Interest rate Receive		6M USD Libor
Contract amount | $				$ 66,124
Not Designated as Hedging Instrument | Interest rate swap 1 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty	[1]	Nomura
Derivative, Term of Contract	[1]	2018~2038
Contract Interest rate Pay	[1]	2.56
Contract Interest rate Receive	[1]	3.75
Contract amount	[1]	₩ 30,000
Not Designated as Hedging Instrument | Interest rate swap 2 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Hana Bank
Derivative, Term of Contract		2018~2023
Contract Interest rate Pay		2.15
Contract Interest rate Receive		3M CD + 0.19
Contract amount		₩ 200,000
Not Designated as Hedging Instrument | Interest rate swap 3 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Hana Bank
Derivative, Term of Contract		2018~2023
Contract Interest rate Pay		2.17
Contract Interest rate Receive		3M CD + 0.19
Contract amount		₩ 200,000
Not Designated as Hedging Instrument | Interest rate swap 4 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Hana Bank
Derivative, Term of Contract		2018~2023
Contract Interest rate Pay		2.03
Contract Interest rate Receive		3M CD + 0.21
Contract amount		₩ 150,000
Not Designated as Hedging Instrument | Interest rate swap 5 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Hana Bank
Derivative, Term of Contract		2019~2024
Contract Interest rate Pay		1.87
Contract Interest rate Receive		3M CD + 0.13
Contract amount		₩ 200,000
Not Designated as Hedging Instrument | Interest rate swap 6 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Shinhan Bank
Derivative, Term of Contract		2021~2025
Contract Interest rate Pay		2.32
Contract Interest rate Receive		3M CD + 0.43
Contract amount		₩ 100,000
Not Designated as Hedging Instrument | Interest rate swap 7 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Hana Bank
Derivative, Term of Contract		2022~2027
Contract Interest rate Pay		3.02
Contract Interest rate Receive		3M CD + 0.61
Contract amount		₩ 200,000
Not Designated as Hedging Instrument | Interest rate swap 8 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Hana Bank
Derivative, Term of Contract		2022~2027
Contract Interest rate Pay		3.04
Contract Interest rate Receive		3M CD + 0.58
Contract amount		₩ 200,000
Not Designated as Hedging Instrument | Interest rate swap 9 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Hana Bank
Derivative, Term of Contract		2022~2027
Contract Interest rate Pay		3.38
Contract Interest rate Receive		3M CD + 0.59
Contract amount		₩ 250,000
Not Designated as Hedging Instrument | Interest rate swap 10 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Nomura
Derivative, Term of Contract		2022~2027
Contract Interest rate Pay		3.55
Contract Interest rate Receive		3M CD + 0.60
Contract amount		₩ 200,000
Not Designated as Hedging Instrument | Interest rate swap 11 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Shinhan Bank
Derivative, Term of Contract		2022~2027
Contract Interest rate Pay		3.53
Contract Interest rate Receive		3M CD + 0.55
Contract amount		₩ 150,000
Not Designated as Hedging Instrument | Interest rate swap 12 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Hana Bank
Derivative, Term of Contract		2022~2027
Contract Interest rate Pay		3.70
Contract Interest rate Receive		3M CD + 0.59
Contract amount		₩ 200,000
Not Designated as Hedging Instrument | Interest rate swap 13 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Nomura
Derivative, Term of Contract		2022~2027
Contract Interest rate Pay		3.89
Contract Interest rate Receive		3M CD + 0.67
Contract amount		₩ 300,000
Not Designated as Hedging Instrument | Interest rate swap 14 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Hana Bank
Derivative, Term of Contract		2022~2027
Contract Interest rate Pay		3.93
Contract Interest rate Receive		3M CD + 0.67
Contract amount		₩ 200,000
Not Designated as Hedging Instrument | Interest rate swap 15 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Nomura
Derivative, Term of Contract		2022~2027
Contract Interest rate Pay		3.80
Contract Interest rate Receive		3M CD + 0.68
Contract amount		₩ 200,000
Not Designated as Hedging Instrument | Interest rate swap 16 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Nomura
Derivative, Term of Contract		2022~2027
Contract Interest rate Pay		4.04
Contract Interest rate Receive		3M CD + 0.60
Contract amount		₩ 300,000
Not Designated as Hedging Instrument | Interest rate swap 17 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Hana Bank
Derivative, Term of Contract		2022~2027
Contract Interest rate Pay		4.68
Contract Interest rate Receive		3M CD + 1.04
Contract amount		₩ 100,000
Not Designated as Hedging Instrument | Interest rate swap 18 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Hana Bank
Derivative, Term of Contract		2022~2027
Contract Interest rate Pay		5.45
Contract Interest rate Receive		3M CD + 1.20
Contract amount		₩ 100,000
Not Designated as Hedging Instrument | Interest rate swap 19 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Nomura
Derivative, Term of Contract		2017~2032
Contract Interest rate Pay		3M Libor + 2.22
Contract Interest rate Receive		2.60
Contract amount		₩ 52,457
Not Designated as Hedging Instrument | Interest rate swap 20 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Nomura
Derivative, Term of Contract		2017~2032
Contract Interest rate Pay		3M Libor + 2.24
Contract Interest rate Receive		2.62
Contract amount		₩ 59,423
Not Designated as Hedging Instrument | Interest rate swap 21 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty	[2]	Nomura
Derivative, Term of Contract	[2]	2021~2041
Contract Interest rate Pay	[2]	1.84
Contract Interest rate Receive	[2]	2.60
Contract amount	[2]	₩ 30,000
Not Designated as Hedging Instrument | Interest rate swap 22 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty	[3]	Nomura
Derivative, Term of Contract	[3]	2021~2041
Contract Interest rate Pay	[3]	1.87
Contract Interest rate Receive	[3]	2.38
Contract amount	[3]	₩ 50,000
Not Designated as Hedging Instrument | Interest rate swap 23 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		ANZ
Derivative, Term of Contract		2022 - 2025
Contract Interest rate Pay		0.48
Contract Interest rate Receive		3.33
Contract amount | $			$ 540
Not Designated as Hedging Instrument | Interest rate swap 24 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		DBS Bank
Derivative, Term of Contract		2022 - 2025
Contract Interest rate Pay		0.48
Contract Interest rate Receive		3.33
Contract amount | $			540
Not Designated as Hedging Instrument | Interest rate swap 25 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Societe Generale
Derivative, Term of Contract		2022 - 2025
Contract Interest rate Pay		0.48
Contract Interest rate Receive		3.28
Contract amount | $			$ 540
[1]2.56% of the contract paying interest rate is applied for five years from the date of issuance, and 3M CD + 0.10% is applied thereafter. Depending on the counterparty exercising the right, the contract may be early settled on the same date every year from June 15, 2023.[2]1.84% of the contract paying interest rate is applied for five years from the date of issuance, and 3M CMT + 0.35% is applied thereafter.[3]1.87% of the contract paying interest rate is applied for five years from the date of issuance, and 3M CMT + 0.35% is applied thereafter.

Derivatives - Summary of Deri_4

Derivatives - Summary of Derivative Interest Rate Swap Contract List (Parenthetical) (Details) - Not Designated as Hedging Instrument	12 Months Ended
	Dec. 31, 2022
Interest rate swap contracts 1 [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Contract Interest rate Pay	2.56	[1]
Interest rate swap contracts 1 [Member] | First Five Years [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Contract Interest rate Pay	2.56
Interest rate swap contracts 1 [Member] | Thereafter [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Contract Interest rate Pay	3M CD + 0.10
Interest rate swap contracts 21 [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Contract Interest rate Pay	1.84	[2]
Interest rate swap contracts 21 [Member] | First Five Years [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Contract Interest rate Pay	1.84
Interest rate swap contracts 21 [Member] | Thereafter [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Contract Interest rate Pay	3M CMT + 0.35
Interest rate swap contracts 22 [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Contract Interest rate Pay	1.87	[3]
Interest rate swap contracts 22 [Member] | First Five Years [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Contract Interest rate Pay	1.87
Interest rate swap contracts 22 [Member] | Thereafter [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Contract Interest rate Pay	3M CMT + 0.35
[1]2.56% of the contract paying interest rate is applied for five years from the date of issuance, and 3M CD + 0.10% is applied thereafter. Depending on the counterparty exercising the right, the contract may be early settled on the same date every year from June 15, 2023.[2]1.84% of the contract paying interest rate is applied for five years from the date of issuance, and 3M CMT + 0.35% is applied thereafter.[3]1.87% of the contract paying interest rate is applied for five years from the date of issuance, and 3M CMT + 0.35% is applied thereafter.

Other Financial Assets - Summar

Other Financial Assets - Summary of Other Financial Assets (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Other Financial Assets [Line Items]
Current Other financial assets	₩ 798,819	₩ 1,365,603
Non-Current Other financial assets	1,567,632	1,271,976
Loans and receivables
Other Financial Assets [Line Items]
Current Other financial assets	132,061	87,589
Non-Current Other financial assets	881,310	821,482
Loans and receivables | Gross amount
Other Financial Assets [Line Items]
Current Other financial assets	132,890	88,406
Non-Current Other financial assets	968,468	903,397
Loans and receivables | Allowance for doubtful accounts
Other Financial Assets [Line Items]
Current Other financial assets	(13)	(10)
Non-Current Other financial assets	(54,824)	(52,667)
Loans and receivables | Present value discount
Other Financial Assets [Line Items]
Current Other financial assets	(816)	(807)
Non-Current Other financial assets	(32,334)	(29,248)
Short-term financial instruments
Other Financial Assets [Line Items]
Current Other financial assets	666,758	1,278,014
Long-term financial instruments
Other Financial Assets [Line Items]
Non-Current Other financial assets	₩ 686,322	₩ 450,494

Other Financial Assets - Summ_2

Other Financial Assets - Summary of Loans and Receivables (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Loans And Leases Receivable Disclosure [Line Items]
Short-term loans and receivables Face value	₩ 132,890	₩ 88,406
Short-term loans and receivables Allowance for doubtful accounts	(13)	(10)
Short-term loans and receivables Present value discount	(816)	(807)
Short-term loans and receivables	132,061	87,589
Long-term loans and receivables Face value	968,468	903,397
Long-term loans and receivables Allowance for doubtful accounts	(54,824)	(52,667)
Long-term loans and receivables Present value discount	(32,334)	(29,248)
Long-term loans and receivables	881,310	821,482
Loans and receivables Face value	1,101,358	991,803
Loans and receivables Allowance for doubtful accounts	(54,837)	(52,677)
Loans and receivables Present value discount	(33,150)	(30,055)
Loans and receivables	1,013,371	909,071
Loans for tuition
Loans And Leases Receivable Disclosure [Line Items]
Short-term loans and receivables Face value	30,261	28,975
Short-term loans and receivables Allowance for doubtful accounts	0	0
Short-term loans and receivables Present value discount	(816)	(807)
Short-term loans and receivables	29,445	28,168
Long-term loans and receivables Face value	436,131	431,002
Long-term loans and receivables Allowance for doubtful accounts	(37,783)	(37,783)
Long-term loans and receivables Present value discount	(32,334)	(29,248)
Long-term loans and receivables	366,014	363,971
Loans for housing
Loans And Leases Receivable Disclosure [Line Items]
Short-term loans and receivables Face value	29,630	25,750
Short-term loans and receivables Allowance for doubtful accounts	0	0
Short-term loans and receivables Present value discount	0	0
Short-term loans and receivables	29,630	25,750
Long-term loans and receivables Face value	309,446	282,833
Long-term loans and receivables Allowance for doubtful accounts	0	0
Long-term loans and receivables Present value discount	0	0
Long-term loans and receivables	309,446	282,833
Loans for related parties
Loans And Leases Receivable Disclosure [Line Items]
Long-term loans and receivables Face value	187,728	150,541
Long-term loans and receivables Allowance for doubtful accounts	(17,041)	(14,861)
Long-term loans and receivables Present value discount	0	0
Long-term loans and receivables	170,687	135,680
Fisheries loan
Loans And Leases Receivable Disclosure [Line Items]
Long-term loans and receivables Face value		203
Long-term loans and receivables Allowance for doubtful accounts		0
Long-term loans and receivables Present value discount		0
Long-term loans and receivables		203
Other loans
Loans And Leases Receivable Disclosure [Line Items]
Short-term loans and receivables Face value	72,999	33,681
Short-term loans and receivables Allowance for doubtful accounts	(13)	(10)
Short-term loans and receivables Present value discount	0	0
Short-term loans and receivables	72,986	33,671
Long-term loans and receivables Face value	35,163	38,818
Long-term loans and receivables Allowance for doubtful accounts	0	(23)
Long-term loans and receivables Present value discount	0	0
Long-term loans and receivables	₩ 35,163	₩ 38,795

Other Financial Assets - Summ_3

Other Financial Assets - Summary of Changes in the Allowance for Doubtful Accounts of Loans and Receivables (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Allowance for doubtful accounts [Abstract]
Beginning balance	₩ 52,677	₩ 20,267	₩ 15,094
Bad debt expense	2,180	30,942	5,173
Other	(20)	1,468	0
Ending balance	₩ 54,837	₩ 52,677	₩ 20,267

Other Financial Assets - Summ_4

Other Financial Assets - Summary of Long-Term and Short-Term Financial Instruments (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Short-term financial instruments
Long / short-term financial instruments [Line Items]
Time deposits	₩ 428,813	₩ 976,899
CD	30,000	0
Others	207,945	301,115
Long / short-term financial instruments	666,758	1,278,014
Long-term financial instruments
Long / short-term financial instruments [Line Items]
Time deposits	130,570	103,607
CD	0	0
Others	555,752	346,887
Long / short-term financial instruments	₩ 686,322	₩ 450,494

Inventories - Summary of Invent

Inventories - Summary of Inventories (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Inventories [Line Items]
Raw materials	₩ 4,520,821	₩ 3,654,341
Merchandise	1,001	512
Work-in-progress	172,014	180,220
Finished goods	52,585	27,254
Supplies	2,814,377	2,537,159
Inventories-in-transit	2,356,444	1,195,148
Other inventories	13,490	13,548
Total Inventories	9,930,732	7,608,182
Acquisition cost
Inventories [Line Items]
Raw materials	4,522,171	3,655,588
Merchandise	1,001	512
Work-in-progress	172,089	180,220
Finished goods	52,642	27,254
Supplies	2,814,377	2,541,028
Inventories-in-transit	2,356,444	1,195,148
Other inventories	13,490	13,548
Total Inventories	9,932,214	7,613,298
Valuation allowance
Inventories [Line Items]
Raw materials	(1,350)	(1,247)
Merchandise	0	0
Work-in-progress	(75)	0
Finished goods	(57)	0
Supplies	0	(3,869)
Inventories-in-transit	0	0
Other inventories	0	0
Total Inventories	₩ (1,482)	₩ (5,116)

Inventories - Additional inform

Inventories - Additional information (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Inventories [Line Items]
Reversal of write down of inventory	₩ 18,162	₩ 11,422	₩ 2,020
Write down of inventory	14,528	7,761	4,998
Other Gains Losses [Member]
Inventories [Line Items]
Write down of inventory	₩ 14,528	₩ 7,761	₩ 4,998

Non-Financial Assets - Summary

Non-Financial Assets - Summary of Non-Financial Assets (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Other Current Assets
Non-Financial Assets [Line Items]
Advance payment	₩ 160,596	₩ 161,466
Prepaid Expenses	366,532	756,729
Miscellaneous Non-Financial Assets
Greenhouse gas emissions rights	192,005	524,658
Other quick assets	1,025,736	316,138
Miscellaneous Non-Financial Assets	1,217,741	840,796
Non-Financial Assets	1,744,869	1,758,991
Other Noncurrent Assets
Non-Financial Assets [Line Items]
Advance payment	51,425	124,305
Prepaid Expenses	153,830	151,095
Miscellaneous Non-Financial Assets
Greenhouse gas emissions rights	0	0
Other quick assets	103,879	89,418
Miscellaneous Non-Financial Assets	103,879	89,418
Non-Financial Assets	₩ 309,134	₩ 364,818

Consolidated Subsidiaries - Sum

Consolidated Subsidiaries - Summary of Consolidated Subsidiaries (Details)		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Korea Hydro & Nuclear Power Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
Korea South-East Power Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
Korea Midland Power Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
Korea Western Power Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
Korea Southern Power Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
Korea East-West Power Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
KEPCO Engineering & Construction Company, Inc.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[1]	Engineering and construction for utility plant and others	Engineering and construction for utility plant and others
Location	[1]	Korea	Korea
Proportion of ownership (%)	[1]	65.77%	65.77%
KEPCO Plant Service & Engineering Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Utility plant maintenance and others	Utility plant maintenance and others
Location		Korea	Korea
Proportion of ownership (%)		51%	51%
KEPCO Nuclear Fuel Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Nuclear fuel	Nuclear fuel
Location		Korea	Korea
Proportion of ownership (%)		96.36%	96.36%
KEPCO KDN Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Electric power information technology and others	Electric power information technology and others
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
KEPCO International HongKong Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Hong Kong	Hong Kong
Proportion of ownership (%)		100%	100%
KEPCO International Philippines Inc.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Philippines	Philippines
Proportion of ownership (%)		100%	100%
KEPCO Gansu International Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Hong Kong	Hong Kong
Proportion of ownership (%)		100%	100%
KEPCO Philippines Holdings Inc.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[2]	Holding company	Holding company
Location	[2]	Philippines	Philippines
Proportion of ownership (%)	[2]	100%	100%
KEPCO Philippines Corporation
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Operation of utility plant	Operation of utility plant
Location		Philippines	Philippines
Proportion of ownership (%)		100%	100%
KEPCO Ilijan Corporation
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Construction and operation of utility plant	Construction and operation of utility plant
Location		Philippines	Philippines
Proportion of ownership (%)		51%	51%
KEPCO Lebanon SARL
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Operation of utility plant	Operation of utility plant
Location		Lebanon	Lebanon
Proportion of ownership (%)		100%	100%
KEPCO Neimenggu International Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Hong Kong	Hong Kong
Proportion of ownership (%)		100%	100%
KEPCO Shanxi International Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Hong Kong	Hong Kong
Proportion of ownership (%)		100%	100%
KOMIPO Global Pte Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Singapore	Singapore
Proportion of ownership (%)		100%	100%
KEPCO Netherlands B.V.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Netherlands	Netherlands
Proportion of ownership (%)		100%	100%
KEPCO Australia Pty., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Resources development	Resources development
Location		Australia	Australia
Proportion of ownership (%)		100%	100%
KOSEP Australia Pty., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Resources development	Resources development
Location		Australia	Australia
Proportion of ownership (%)		100%	100%
KOMIPO Australia Pty., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Resources development	Resources development
Location		Australia	Australia
Proportion of ownership (%)		100%	100%
KOWEPO Australia Pty., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Resources development	Resources development
Location		Australia	Australia
Proportion of ownership (%)		100%	100%
KOSPO Australia Pty., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Resources development	Resources development
Location		Australia	Australia
Proportion of ownership (%)		100%	100%
KEPCO Middle East Holding Company
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Bahrain	Bahrain
Proportion of ownership (%)		100%	100%
Qatrana Electric Power Company
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Construction and operation of utility plant	Construction and operation of utility plant
Location		Jordan	Jordan
Proportion of ownership (%)		80%	80%
KHNP Canada Energy Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Canada	Canada
Proportion of ownership (%)		100%	100%
KEPCO Bylong Australia Pty., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Resources development	Resources development
Location		Australia	Australia
Proportion of ownership (%)		100%	100%
Korea Waterbury Uranium Limited Partnership
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Resources development	Resources development
Location		Canada	Canada
Proportion of ownership (%)		80%	80%
KEPCO Holdings de Mexico
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Mexico	Mexico
Proportion of ownership (%)		100%	100%
KST Electric Power Company, S.A.P.I. de C.V.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Construction and operation of utility plant	Construction and operation of utility plant
Location		Mexico	Mexico
Proportion of ownership (%)		56%	56%
KEPCO Energy Service Company
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Operation of utility plant	Operation of utility plant
Location		Mexico	Mexico
Proportion of ownership (%)		100%	100%
KEPCO Netherlands S3 B.V.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Netherlands	Netherlands
Proportion of ownership (%)		100%	100%
PT. KOMIPO Pembangkitan Jawa Bali
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Operation of utility plant	Operation of utility plant
Location		Indonesia	Indonesia
Proportion of ownership (%)		51%	51%
PT. Cirebon Power Service
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[3]	Operation of utility plant	Operation of utility plant
Location	[3]	Indonesia	Indonesia
Proportion of ownership (%)	[3]	27.50%	27.50%
KOWEPO International Corporation
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Operation of utility plant	Operation of utility plant
Location		Philippines	Philippines
Proportion of ownership (%)		99.99%	99.99%
KOSPO Jordan LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Operation of utility plant	Operation of utility plant
Location		Jordan	Jordan
Proportion of ownership (%)		100%	100%
EWP America Inc.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		USA	USA
Proportion of ownership (%)		100%	100%
EWP Renewable Corporation
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		USA	USA
Proportion of ownership (%)		100%	100%
KNF Canada Energy Limited
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Canada	Canada
Proportion of ownership (%)		100%	100%
EWP Barbados 1 SRL
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Barbados	Barbados
Proportion of ownership (%)		100%	100%
California Power Holdings, LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		USA	USA
Proportion of ownership (%)		100%	100%
Gyeonggi Green Energy Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		Korea	Korea
Proportion of ownership (%)		62.01%	62.01%
PT. Tanggamus Electric Power
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		Indonesia	Indonesia
Proportion of ownership (%)		52.50%	52.50%
Gyeongju Wind Power Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		Korea	Korea
Proportion of ownership (%)		70%	70%
KOMIPO America Inc.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		USA	USA
Proportion of ownership (%)		100%	100%
EWPRC Biomass Holdings, LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		USA	USA
Proportion of ownership (%)		0%	100%
Reason		Liquidation
PT. EWP Indonesia
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Indonesia	Indonesia
Proportion of ownership (%)		99.96%	99.96%
KEPCO Netherlands J3 B.V.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Netherlands	Netherlands
Proportion of ownership (%)		100%	100%
Korea Offshore Wind Power Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
Global One Pioneer B.V.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Netherlands	Netherlands
Proportion of ownership (%)		100%	100%
Global Energy Pioneer B.V.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Netherlands	Netherlands
Proportion of ownership (%)		100%	100%
Mira Power Limited
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[4]	Power generation	Power generation
Location	[4]	Pakistan	Pakistan
Proportion of ownership (%)	[4]	76%	76%
KOSEP Material Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Recycling fly ashes	Recycling fly ashes
Location		Korea	Korea
Proportion of ownership (%)		86.22%	86.22%
Commerce and Industry Energy Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[5]	RDF power generation	RDF power generation
Location	[5]	Korea	Korea
Proportion of ownership (%)	[5]	85.03%	85.03%
KEPCO KPS Philippines Corp.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Utility plant maintenance and others	Utility plant maintenance and others
Location		Philippines	Philippines
Proportion of ownership (%)		99.99%	99.99%
KOSPO Chile SpA
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Chile	Chile
Proportion of ownership (%)		100%	100%
PT. KOWEPO Sumsel Operation and Maintenance Services
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Utility plant maintenance and others	Utility plant maintenance and others
Location		Indonesia	Indonesia
Proportion of ownership (%)		95%	95%
Hee Mang Sunlight Power Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Operation of utility plant	Operation of utility plant
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
Fujeij Wind Power Company
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Operation of utility plant	Operation of utility plant
Location		Jordan	Jordan
Proportion of ownership (%)		100%	100%
KOSPO Youngnam Power Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[6]	Operation of utility plant	Operation of utility plant
Location	[6]	Korea	Korea
Proportion of ownership (%)	[6]	50%	50%
Chitose Solar Power Plant LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		Japan	Japan
Proportion of ownership (%)		65%	65%
KEPCO Energy Solution Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Energy service	Energy service
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
KEPCO Solar Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
KOSPO Power Services Ltda.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Utility plant maintenance and others	Utility plant maintenance and others
Location		Chile	Chile
Proportion of ownership (%)		65%	65%
Energy New Industry Specialized Investment Private Investment Trust
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Korea	Korea
Proportion of ownership (%)		99.01%	99.01%
KOEN Bylong Pty., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Resources development	Resources development
Location		Australia	Australia
Proportion of ownership (%)		100%	100%
KOMIPO Bylong Pty., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Resources development	Resources development
Location		Australia	Australia
Proportion of ownership (%)		100%	100%
KOWEPO Bylong Pty., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Resources development	Resources development
Location		Australia	Australia
Proportion of ownership (%)		100%	100%
KOSPO Bylong Pty., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Resources development	Resources development
Location		Australia	Australia
Proportion of ownership (%)		100%	100%
EWP Bylong Pty., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Resources development	Resources development
Location		Australia	Australia
Proportion of ownership (%)		100%	100%
KOWEPO Lao International
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Utility plant maintenance and others	Utility plant maintenance and others
Location		Laos	Laos
Proportion of ownership (%)		100%	100%
KEPCO US Inc.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		USA	USA
Proportion of ownership (%)		100%	100%
KEPCO Alamosa LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		USA	USA
Proportion of ownership (%)		0%	50.10%
Reason		Liquidation
KEPCO Solar of Alamosa LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		USA	USA
Proportion of ownership (%)		0%	100%
Reason		Disposal
KEPCO Mangilao Holdings LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		USA	USA
Proportion of ownership (%)		100%	100%
Mangilao Investment LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		USA	USA
Proportion of ownership (%)		80.06%	100%
KEPCO Mangilao Solar, LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		USA	USA
Proportion of ownership (%)		100%	100%
Jeju Hanlim Offshore Wind Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		Korea	Korea
Proportion of ownership (%)		79.03%	79.03%
PT. Siborpa Eco Power
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Construction and operation of utility plant	Construction and operation of utility plant
Location		Indonesia	Indonesia
Proportion of ownership (%)		55%	55%
BSK E-New Industry Fund VII
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Korea	Korea
Proportion of ownership (%)		81.67%	81.67%
e-New Industry LB Fund 1
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Korea	Korea
Proportion of ownership (%)		76.11%	76.11%
Songhyun e-New Industry Fund
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Korea	Korea
Proportion of ownership (%)		80.65%	80.65%
BSK E-New Industry Fund X
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Korea	Korea
Proportion of ownership (%)		66.80%	66.80%
PT. Korea Energy Indonesia
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Utility plant maintenance and others	Utility plant maintenance and others
Location		Indonesia	Indonesia
Proportion of ownership (%)		95%	95%
KOLAT SpA
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Utility plant maintenance and others	Utility plant maintenance and others
Location		Chile	Chile
Proportion of ownership (%)		100%	100%
KEPCO California, LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		USA	USA
Proportion of ownership (%)		100%	100%
KEPCO Mojave Holdings, LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		USA	USA
Proportion of ownership (%)		100%	100%
Incheon Fuel Cell Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		Korea	Korea
Proportion of ownership (%)		60%	60%
KOEN Service Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Facility maintenance and service	Facility maintenance and service
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
KOMIPO Service Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Facility maintenance and service	Facility maintenance and service
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
KOWEPO Service Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Facility maintenance and service	Facility maintenance and service
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
KOSPO Service Co., Ltd
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Facility maintenance and service	Facility maintenance and service
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
EWP Service Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Facility maintenance and service	Facility maintenance and service
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
PT. KOMIPO Energy Indonesia
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Utility plant maintenance and others	Utility plant maintenance and others
Location		Indonesia	Indonesia
Proportion of ownership (%)		95%	95%
KNF Partners Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Facility maintenance and service	Facility maintenance and service
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
KOSPO USA Inc.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		USA	USA
Proportion of ownership (%)		100%	100%
Nambu USA LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		USA	USA
Proportion of ownership (%)		100%	100%
Tamra Offshore Wind Power Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		Korea	Korea
Proportion of ownership (%)		63%	63%
KEPCO MCS Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Electric meter reading and others	Electric meter reading and others
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
KEPCO FMS Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Security service and others	Security service and others
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
Firstkeepers Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Facility maintenance and service	Facility maintenance and service
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
Secutec Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Security service	Security service
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
SE Green Energy Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		Korea	Korea
Proportion of ownership (%)		84.80%	84.80%
KEPCO Mangilao America LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		USA	USA
Proportion of ownership (%)		0%	100%
Reason		Liquidation
Mangilao Intermediate Holdings LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		USA	USA
Proportion of ownership (%)		100%	100%
KEPCO CSC Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Facility maintenance and service	Facility maintenance and service
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
KOAK Power Limited
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Hydro power facility maintenance	Hydro power facility maintenance
Location		Pakistan	Pakistan
Proportion of ownership (%)		100%	100%
KOMIPO Europe B.V.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Netherlands	Netherlands
Proportion of ownership (%)		100%	100%
Haenanum Energy Fund
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Korea	Korea
Proportion of ownership (%)		99.64%	99.64%
Paju Ecoenergy Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		Korea	Korea
Proportion of ownership (%)		89%	89%
Guam Ukudu Power LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		USA	USA
Proportion of ownership (%)		100%	100%
K-SOLAR SHINAN Co., Ltd. (formerly, TS Energy No. 25 Co., Ltd.)
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		Korea	Korea
Proportion of ownership (%)		90%	90%
KPS Partners Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Facility maintenance and service	Facility maintenance and service
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
KEPCO E&C Service Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Facility maintenance and service	Facility maintenance and service
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
Moha Solar Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
Ogiri Solar Power Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		Korea	Korea
Proportion of ownership (%)		70%	70%
KHNP USA LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		USA	USA
Proportion of ownership (%)		100%	100%
KOMIPO Vanphong Power Service LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Utility plant maintenance and others	Utility plant maintenance and others
Location		Vietnam	Vietnam
Proportion of ownership (%)		100%	100%
Energy Innovation Fund I
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Korea	Korea
Proportion of ownership (%)		71.91%	71.91%
KHNP Chile SpA
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Chile	Chile
Proportion of ownership (%)		100%	100%
Yeong Yang Apollon Photovoltaic Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
Yeong Yang Corporation Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
SolarVader Co., Ltd
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
Yeong Yang Innovation Co., Ltd
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
Yeong Yang Horus Photovoltaic Co., Ltd
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
Yeong Yang Solar Management Co., Ltd
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		Korea	Korea
Proportion of ownership (%)		100%	100%
LSG Hydro Power Limited
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Pakistan	Pakistan
Proportion of ownership (%)		99.80%	99.80%
KOEN Bio Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Wood pellet utilization business	Wood pellet utilization business
Location		Korea	Korea
Proportion of ownership (%)		70%	70%
KOMIPO Energy Solution America, LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		USA	USA
Proportion of ownership (%)		100%	100%
Elara Investment Holdings, LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[7]	Holding company	Holding company
Location	[7]	USA	USA
Proportion of ownership (%)	[7]	0.10%	0.10%
Elara Equity Holdings, LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		USA	USA
Proportion of ownership (%)		54%	54%
Elara Class B Holdings, LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		USA	USA
Proportion of ownership (%)		100%	100%
Elara Class B Member, LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		USA	USA
Proportion of ownership (%)		100%	100%
Elara Development Holdings, LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		USA	USA
Proportion of ownership (%)		100%	100%
KOMIPO Development, LLC (formerly, Elara Development, LLC)
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		USA	USA
Proportion of ownership (%)		100%	100%
Elara Energy Holdings, LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[7]	Holding company	Holding company
Location	[7]	USA	USA
Proportion of ownership (%)	[7]	43.94%	43.94%
Elara Energy Project, LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		USA	USA
Proportion of ownership (%)		100%	100%
KOMIPO Iberian Solar Group, S.L.U.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Spain	Spain
Proportion of ownership (%)		100%	100%
Jeongam Wind Power Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		Korea	Korea
Proportion of ownership (%)		80%	80%
KOWEPO Europe B.V.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Netherlands	Netherlands
Proportion of ownership (%)		100%	100%
CVS Equity Holdings, LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		USA	USA
Proportion of ownership (%)		81.34%	100%
CVS Class B Holdings, LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		USA	USA
Proportion of ownership (%)		100%	100%
CVS Development Holdings, LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		USA	USA
Proportion of ownership (%)		100%	100%
CVS Development, LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		USA	USA
Proportion of ownership (%)		100%	100%
CVS Class B Member, LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		USA	USA
Proportion of ownership (%)		100%	100%
CVS Energy Holdings, LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		USA	USA
Proportion of ownership (%)		70.79%	100%
Concho Valley Energy, LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		USA	USA
Proportion of ownership (%)		100%	100%
Concho Valley Solar, LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		USA	USA
Proportion of ownership (%)		100%	100%
Yeongdeok Sunrise Wind Power Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		Korea	Korea
Proportion of ownership (%)		70%	70%
KHNP Spain, S.L.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Spain	Spain
Proportion of ownership (%)		100%	100%
UI Carbon-Neutrality Fund
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Korea	Korea
Proportion of ownership (%)		78.97%	0%
Reason		Newly established
KA Power Limited
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		Pakistan	Pakistan
Proportion of ownership (%)		100%	0%
Reason		Newly established
Western Power Changgi Solar Co., Ltd. (formerly, Sam-Yang Photovoltaic Power Co., Ltd.)
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[8]	Power generation	Power generation
Location	[8]	Korea	Korea
Proportion of ownership (%)	[8]	100%	0%
Reason		Change in the scope of consolidation
EWP Australia Pty., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Australia	Australia
Proportion of ownership (%)		100%	0%
Reason		Newly established
Columboola Solar Farm Hold Co Pty., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[9]	Power generation	Power generation
Location	[9]	Australia	Australia
Proportion of ownership (%)	[9]	74.04%	0%
Reason		New investment
Digital Innovation Growth Fund
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[10]	Holding company	Holding company
Location	[10]	Korea	Korea
Proportion of ownership (%)	[10]	76.92%	0%
Reason		Change in the scope of consolidation
J Wind First, LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[11]	Company specializing in liquidization	Company specializing in liquidization
Location	[11]	Korea	Korea
Proportion of ownership (%)	[11]	0%	0%
Reason		Newly established
KEPCO Holding Company
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		Saudi Arabia	Saudi Arabia
Proportion of ownership (%)		100%	0%
Reason		Newly established
KEPCO for Power Company
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation	Power generation
Location		Saudi Arabia	Saudi Arabia
Proportion of ownership (%)		60%	0%
Reason		Newly established
KEPCO for Maintenance Company
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Utility plant maintenance and others	Utility plant maintenance and others
Location		Saudi Arabia	Saudi Arabia
Proportion of ownership (%)		100%	0%
Reason		Newly established
KOSPO Trumbull LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		USA	USA
Proportion of ownership (%)		100%	0%
Reason		Newly established
Changjuk Wind Power Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[10]	Power generation	Power generation
Location	[10]	Korea	Korea
Proportion of ownership (%)	[10]	73%	0%
Reason		Change in the scope of consolidation
Seobusambo highway photovoltaics Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Reason		Newly established
Seobusambo highway photovoltaics Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Reason		Change in the scope of consolidation
[1]Considering treasury stocks, the effective percentage of ownership is 66.08%. The Company is planning to sell part of its shares (14.77%) based on the resolution of the board of directors on June 24, 2022.[2]The Company is planning to sell its investment in KEPCO Philippines Holdings Inc., but time or proceeds of sales are not specified as of December 31, 2022.[3]The effective percentage of ownership is less than 50%. However, this subsidiary is included in the consolidated financial statements as the Company obtained the majority of the voting power under the shareholders’ agreement.[4]As of the reporting date, the annual reporting period of all subsidiaries is December 31, except for Mira Power Limited.[5]The Company guarantees a certain return on investment related to Commerce and Industry Energy Co., Ltd. for the financial investors. The financial investors have a right to sell their shares to the Company which can be exercised 36 months after the date of investment. Accordingly, the purchase price including the return on investment is classified as a liability.[6]The subsidiary is included in the consolidated financial statements as the Company owns 50%+1 stake and has the ability to appoint a majority of the board members under the shareholders’ agreement.[7]The effective percentage of ownership is less than 50%. However, this subsidiary is included in the consolidated financial statements as the Company has control over the board of directors under the shareholders’ agreement.[8]For the year ended December 31, 2022, the Company included Western Power Changgi Solar Co., Ltd. as a subsidiary, considering that it acquired control over the entity after the entity undertook selective reduction of capital.[9]Excluding preferred stocks, the percentage of ownership with voting rights is 100%.[10]The entity was transferred from an associate to a subsidiary due to changes in the consolidated scope during the year ended December 31, 2022.[11]Although the Company does not hold a stake as of December 31, 2022, considering the purpose and design of the structured entity, the Company is exposed to volatility in the profits of the structured entity. In addition, Group has the ability to direct activities that can most significantly affect the operations of the structured entity, so it has been determined that the Company has control over the entity.

Consolidated Subsidiaries - S_2

Consolidated Subsidiaries - Summary of Consolidated Subsidiaries (Parentheticals) (Details)			12 Months Ended
		Jun. 24, 2022	Dec. 31, 2022	Dec. 31, 2021
KEPCO Engineering & Construction Company, Inc.
Disclosure of subsidiaries [line items]
Proportion of ownership percentage	[1]		65.77%	65.77%
Sale of shares held percentage		14.77%
Percentage of Effective Percentage Ownership Holding In Subsidiary			66.08%
PT. Cirebon Power Service
Disclosure of subsidiaries [line items]
Proportion of ownership percentage	[2]		27.50%	27.50%
Description of Reason for Subsidiary Included in in the Consolidated Financial Statements			50%
KOSPO Youngnam Power Co., Ltd.
Disclosure of subsidiaries [line items]
Proportion of ownership percentage	[3]		50%	50%
Elara Investment Holdings, LLC
Disclosure of subsidiaries [line items]
Proportion of ownership percentage	[4]		0.10%	0.10%
Description of Reason for Subsidiary Included in in the Consolidated Financial Statements			50%
Columboola Solar Farm Hold Co Pty., Ltd. [Member]
Disclosure of subsidiaries [line items]
Proportion of ownership percentage	[5]		74.04%	0%
Percentage of voting equity interests acquired			100%
[1]Considering treasury stocks, the effective percentage of ownership is 66.08%. The Company is planning to sell part of its shares (14.77%) based on the resolution of the board of directors on June 24, 2022.[2]The effective percentage of ownership is less than 50%. However, this subsidiary is included in the consolidated financial statements as the Company obtained the majority of the voting power under the shareholders’ agreement.[3]The subsidiary is included in the consolidated financial statements as the Company owns 50%+1 stake and has the ability to appoint a majority of the board members under the shareholders’ agreement.[4]The effective percentage of ownership is less than 50%. However, this subsidiary is included in the consolidated financial statements as the Company has control over the board of directors under the shareholders’ agreement.[5]Excluding preferred stocks, the percentage of ownership with voting rights is 100%.

Consolidated Subsidiaries - S_3

Consolidated Subsidiaries - Summary of Financial Information of Consolidated Subsidiaries (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021
Korea Hydro & Nuclear Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		₩ 69,129,625		₩ 64,638,690
Total liabilities		42,843,974		38,361,337
Sales		10,386,091		9,324,391
Profit (loss) for the year		(16,382)		302,232
Korea South-East Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		13,855,071		11,487,325
Total liabilities		7,410,881		6,510,826
Sales		8,972,991		5,188,856
Profit (loss) for the year		71,662		(58,096)
Korea Midland Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		16,062,605		13,761,908
Total liabilities		10,776,943		9,912,907
Sales		8,629,165		5,353,915
Profit (loss) for the year		(58,173)		60,737
Korea Western Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		13,459,054		10,822,780
Total liabilities		8,125,312		7,116,671
Sales		8,112,727		4,970,805
Profit (loss) for the year		106,361		(171,562)
Korea Southern Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		14,011,354		11,350,984
Total liabilities		8,296,983		7,099,881
Sales		9,304,362		5,671,989
Profit (loss) for the year		(68,315)		(113,352)
Korea East-West Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		12,079,954		9,895,739
Total liabilities		5,818,789		5,163,005
Sales		6,925,094		4,743,030
Profit (loss) for the year		2,888		10,872
KEPCO Engineering & Construction Company, Inc.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		815,533		705,043
Total liabilities		272,119		191,592
Sales		505,291		433,127
Profit (loss) for the year		17,954		16,452
KEPCO Plant Service & Engineering Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		1,555,453		1,420,705
Total liabilities		344,702		311,607
Sales		1,425,913		1,375,668
Profit (loss) for the year		97,881		98,132
KEPCO Nuclear Fuel Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		949,455		837,249
Total liabilities		490,215		405,614
Sales		304,405		323,729
Profit (loss) for the year		31,508		25,799
KEPCO KDN Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		734,439		721,634
Total liabilities		166,272		189,242
Sales		739,453		673,261
Profit (loss) for the year		42,584		67,244
KEPCO International HongKong Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		128,784		128,968
Total liabilities		0		0
Sales		0		0
Profit (loss) for the year		(216)		341
KEPCO International Philippines Inc.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		127,744		154,317
Total liabilities		101		482
Sales		0		0
Profit (loss) for the year		9,976		8,766
KEPCO Gansu International Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		7,125		7,151
Total liabilities		598		559
Sales		0		0
Profit (loss) for the year		(22)		(25)
KEPCO Philippines Holdings Inc.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		191,634		191,757
Total liabilities		129		128
Sales		0		0
Profit (loss) for the year		39,346		60,192
KEPCO Philippines Corporation
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		3,799		6,122
Total liabilities		14		19
Sales		0		0
Profit (loss) for the year		102		(68)
KEPCO Ilijan Corporation
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		231,132		259,069
Total liabilities		3,642		38,555
Sales		23,263		60,532
Profit (loss) for the year		16,455		12,981
KEPCO Lebanon SARL
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		1,890		1,729
Total liabilities		10,482		9,794
Sales		0		0
Profit (loss) for the year		20		(86)
KEPCO Neimenggu International Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		269,582		241,299
Total liabilities		3,917		3,106
Sales		0		0
Profit (loss) for the year		9,938		16,762
KEPCO Shanxi International Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		597,635		551,407
Total liabilities		222,186		207,844
Sales		0		0
Profit (loss) for the year		(11,312)		3,526
KOMIPO Global Pte Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		388,071		302,340
Total liabilities		1,817		1,351
Sales		0		0
Profit (loss) for the year		58,030		11,462
KEPCO Netherlands B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		137,454		133,610
Total liabilities		64		866
Sales		0		0
Profit (loss) for the year		8,570		5,395
KEPCO Australia Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		579		481
Total liabilities		11		11
Sales		0		0
Profit (loss) for the year		102		25
KOSEP Australia Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		74,180		44,798
Total liabilities		13,097		5,561
Sales		52,271		22,013
Profit (loss) for the year		24,443		8,268
KOMIPO Australia Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		81,216		54,162
Total liabilities		10,327		5,648
Sales		52,272		22,013
Profit (loss) for the year		23,368		5,942
KOWEPO Australia Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		81,696		54,564
Total liabilities		10,184		4,766
Sales		52,271		22,013
Profit (loss) for the year		22,745		7,387
KOSPO Australia Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		41,872		43,886
Total liabilities		10,174		4,502
Sales		52,271		22,013
Profit (loss) for the year		24,362		5,940
KEPCO Middle East Holding Company
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		116,731		104,068
Total liabilities		102,054		89,756
Sales		0		0
Profit (loss) for the year		(634)		1,144
Qatrana Electric Power Company
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		513,277		480,809
Total liabilities		247,027		262,725
Sales		24,354		21,368
Profit (loss) for the year		22,578		19,156
KHNP Canada Energy Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		107,200		109,326
Total liabilities		6,218		25
Sales		0		0
Profit (loss) for the year		149		29
KEPCO Bylong Australia Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		44,034		44,319
Total liabilities		437,852		394,349
Sales		0		0
Profit (loss) for the year		(45,880)		(37,065)
Korea Waterbury Uranium Limited Partnership
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		20,934		20,920
Total liabilities		224		159
Sales		0		0
Profit (loss) for the year		(116)		(57)
KEPCO Holdings de Mexico
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		728		148
Total liabilities		1,974		27
Sales		0		0
Profit (loss) for the year		(1,363)		(8)
KST Electric Power Company, S.A.P.I. de C.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		653,830		584,625
Total liabilities		528,315		435,796
Sales		232,893		151,467
Profit (loss) for the year		23,122		18,499
KEPCO Energy Service Company
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		2,238		2,500
Total liabilities		2,173		956
Sales		7,015		12,070
Profit (loss) for the year		(211)		574
KEPCO Netherlands S3 B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		71,326		51,045
Total liabilities		16,419		150
Sales		0		0
Profit (loss) for the year		4,465		3,199
PT. KOMIPO Pembangkitan Jawa Bali
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		15,753		13,499
Total liabilities		3,232		3,314
Sales		22,488		18,296
Profit (loss) for the year		3,668		885
PT. Cirebon Power Service
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		2,316		2,545
Total liabilities		784		631
Sales		9,602		8,664
Profit (loss) for the year		355		505
KOWEPO International Corporation
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		0		0
Total liabilities		10		10
Sales		0		0
Profit (loss) for the year		0		0
KOSPO Jordan LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		22,854		33,782
Total liabilities		6,964		16,298
Sales		45,009		9,698
Profit (loss) for the year		7,657		816
EWP America Inc.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		47,775	[1]	46,687	[2]
Total liabilities		2,595	[1]	1,278	[2]
Sales		21,717	[1]	18,335	[2]
Profit (loss) for the year		4,337	[1]	6,807	[2]
KNF Canada Energy Limited
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		2,116		2,101
Total liabilities		34		17
Sales		0		0
Profit (loss) for the year		(59)		(43)
EWP Barbados 1 SRL
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		395,067		354,024
Total liabilities		901		1,172
Sales		3,230		2,861
Profit (loss) for the year		34,260		16,168
Gyeonggi Green Energy Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		220,414		243,977
Total liabilities		226,517		224,132
Sales		112,524		93,794
Profit (loss) for the year		(26,004)		(5,588)
PT. Tanggamus Electric Power
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		227,638		212,161
Total liabilities		163,106		167,409
Sales		3,781		2,903
Profit (loss) for the year		5,778		3,017
Gyeongju Wind Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		98,513		96,937
Total liabilities		55,579		60,702
Sales		24,888		15,289
Profit (loss) for the year		9,711		3,132
KOMIPO America Inc.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	[3]	571,200		329,986
Total liabilities	[3]	317,903		56,325
Sales	[3]	34,059		1,715
Profit (loss) for the year	[3]	(3,293)		(1,311)
PT. EWP Indonesia
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		93,390		47,031
Total liabilities		5		1,226
Sales		0		0
Profit (loss) for the year		4,100		4,615
KEPCO Netherlands J3 B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		135,213		151,478
Total liabilities		63		172
Sales		0		0
Profit (loss) for the year		19,396		27,365
Korea Offshore Wind Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		376,449		359,393
Total liabilities		192,335		188,507
Sales		52,526		36,020
Profit (loss) for the year		13,083		3,820
Global One Pioneer B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		135		119
Total liabilities		41		116
Sales		0		0
Profit (loss) for the year		(68)		(132)
Global Energy Pioneer B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		320		293
Total liabilities		40		131
Sales		0		0
Profit (loss) for the year		(64)		(147)
Mira Power Limited
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		416,750		424,183
Total liabilities		310,529		311,459
Sales		57,135		70,287
Profit (loss) for the year		12,394		34,018
KOSEP Material Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		3,985		3,405
Total liabilities		662		842
Sales		4,589		4,518
Profit (loss) for the year		775		442
Commerce and Industry Energy Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		79,172		85,315
Total liabilities		32,147		35,543
Sales		31,068		30,531
Profit (loss) for the year		(3,730)		1,345
KEPCO KPS Philippines Corp.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		5,294		8,051
Total liabilities		600		3,652
Sales		5,232		9,768
Profit (loss) for the year		1,004		1,493
KOSPO Chile SpA
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		159,500		142,956
Total liabilities		70,037		56,688
Sales		0		0
Profit (loss) for the year		(2,811)		(851)
PT. KOWEPO Sumsel Operation and Maintenance Services
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		25		116
Total liabilities		252		259
Sales		0		0
Profit (loss) for the year		(94)		0
Hee Mang Sunlight Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		5,877		6,242
Total liabilities		2,606		3,272
Sales		862		499
Profit (loss) for the year		304		47
Fujeij Wind Power Company
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		213,113		200,783
Total liabilities		163,690		169,340
Sales		0		0
Profit (loss) for the year		16,564		14,739
KOSPO Youngnam Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		425,000		393,745
Total liabilities		312,831		292,765
Sales		568,224		318,770
Profit (loss) for the year		10,878		6,339
Chitose Solar Power Plant LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		109,964		125,578
Total liabilities		94,366		109,470
Sales		14,384		16,630
Profit (loss) for the year		1,615		1,794
KEPCO Energy Solution Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		317,392		317,676
Total liabilities		6,147		4,938
Sales		33,638		21,423
Profit (loss) for the year		138		3,104
KEPCO Solar Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		243,221		231,567
Total liabilities		25,405		22,229
Sales		24,778		11,305
Profit (loss) for the year		9,305		2,014
KOSPO Power Services Ltda.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		6,722		8,007
Total liabilities		4,762		5,800
Sales		17,911		21,133
Profit (loss) for the year		(358)		(356)
Energy New Industry Specialized Investment Private Investment Trust
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		451,762	[4]	336,932	[5]
Total liabilities		4,338	[4]	28,536	[5]
Sales		24,725	[4]	19,405	[5]
Profit (loss) for the year		7,093	[4]	11,116	[5]
KOEN Bylong Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		11		8
Total liabilities		119		86
Sales		0		0
Profit (loss) for the year		(12)		0
KOMIPO Bylong Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		11		8
Total liabilities		122		86
Sales		0		0
Profit (loss) for the year		(33)		(8)
KOWEPO Bylong Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		8		8
Total liabilities		94		86
Sales		0		0
Profit (loss) for the year		(7)		(18)
KOSPO Bylong Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		25		73
Total liabilities		148		168
Sales		0		0
Profit (loss) for the year		(17)		(20)
EWP Bylong Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		8		8
Total liabilities		54		54
Sales		0		0
Profit (loss) for the year		1		0
KOWEPO Lao International
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		8,248		12,974
Total liabilities		87		70
Sales		10,010		8,543
Profit (loss) for the year		11,185		5,681
KEPCO US Inc.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		91		17,601
Total liabilities		0		0
Sales		0		0
Profit (loss) for the year		(19,181)		0
KEPCO Alamosa LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets				34,100
Total liabilities				297
Sales				124
Profit (loss) for the year				(62)
KEPCO Solar of Alamosa LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets				57,104
Total liabilities				41,953
Sales				8,008
Profit (loss) for the year				(742)
KEPCO Mangilao Holdings LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		112,948		28,504
Total liabilities		40,558		32,501
Sales		21,743		0
Profit (loss) for the year		21,166		(556)
Mangilao Investment LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		258,674		43,459
Total liabilities		4		29
Sales		0		0
Profit (loss) for the year		(1)		(14)
KEPCO Mangilao Solar, LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		240,736		206,018
Total liabilities		373		166,095
Sales		8,870		0
Profit (loss) for the year		(14,818)		(865)
Jeju Hanlim Offshore Wind Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		185,357		41,325
Total liabilities		111,343		5,139
Sales		0		0
Profit (loss) for the year		(3,546)		(2,893)
PT. Siborpa Eco Power
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		12,050		11,306
Total liabilities		3		0
Sales		0		0
Profit (loss) for the year		(39)		(105)
PT. Korea Energy Indonesia
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		1,675		1,917
Total liabilities		80		215
Sales		1,937		1,681
Profit (loss) for the year		(104)		37
KOLAT SpA
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		48,787		28,349
Total liabilities		3,701		849
Sales		1,647		180
Profit (loss) for the year		1,888		(464)
KEPCO California, LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		46,151		43,732
Total liabilities		4,768		4,113
Sales		596		1,310
Profit (loss) for the year		(670)		160
KEPCO Mojave Holdings, LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		95,550		95,294
Total liabilities		75,846		71,358
Sales		0		0
Profit (loss) for the year		(4,705)		(4,254)
Incheon Fuel Cell Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		268,063		268,100
Total liabilities		242,176		236,901
Sales		107,193		54,188
Profit (loss) for the year		(5,323)		8,738
KOEN Service Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		9,353		8,963
Total liabilities		7,035		6,557
Sales		36,340		35,190
Profit (loss) for the year		356		2,326
KOMIPO Service Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		6,597		4,384
Total liabilities		4,503		4,475
Sales		35,031		32,323
Profit (loss) for the year		905		(96)
KOWEPO Service Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		6,266		7,289
Total liabilities		3,130		5,869
Sales		34,031		31,700
Profit (loss) for the year		171		303
KOSPO Service Co., Ltd
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		6,672		5,762
Total liabilities		5,048		4,990
Sales		28,321		26,257
Profit (loss) for the year		60		31
EWP Service Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		3,756		5,483
Total liabilities		2,507		5,455
Sales		24,526		24,957
Profit (loss) for the year		581		14
PT. KOMIPO Energy Indonesia
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		2,978		2,996
Total liabilities		368		395
Sales		1,698		2,077
Profit (loss) for the year		83		106
KNF Partners Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		2,285		1,800
Total liabilities		1,053		969
Sales		5,997		5,664
Profit (loss) for the year		293		152
KOSPO USA Inc.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		315,018		286,081
Total liabilities		430		293
Sales		0		0
Profit (loss) for the year		5,024		968
Nambu USA LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		297,516		277,698
Total liabilities		0		0
Sales		0		0
Profit (loss) for the year		670		568
Tamra Offshore Wind Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		133,598		146,736
Total liabilities		93,639		106,961
Sales		18,332		21,731
Profit (loss) for the year		5,316		5,168
KEPCO MCS Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		114,316		80,277
Total liabilities		52,241		39,139
Sales		363,627		349,116
Profit (loss) for the year		8,468		19,043
KEPCO FMS Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		16,852		17,188
Total liabilities		11,667		15,577
Sales		105,339		94,210
Profit (loss) for the year		2,176		214
Firstkeepers Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		16,448		17,152
Total liabilities		12,912		16,041
Sales		84,620		77,189
Profit (loss) for the year		2,482		19
Secutec Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		12,578		13,176
Total liabilities		9,209		10,662
Sales		69,383		65,963
Profit (loss) for the year		690		1,774
SE Green Energy Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		149,189		153,105
Total liabilities		114,241		119,461
Sales		49,873		38,867
Profit (loss) for the year		1,304		4,025
KEPCO Mangilao America LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets				2,173
Total liabilities				1
Sales				0
Profit (loss) for the year				0
Mangilao Intermediate Holdings LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		236,266		220,690
Total liabilities		116,426		205,421
Sales		0		0
Profit (loss) for the year		(4,709)		(6,975)
KEPCO CSC Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		10,668		8,093
Total liabilities		8,937		6,799
Sales		46,559		41,854
Profit (loss) for the year		(2,134)		(2,101)
KOAK Power Limited
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		12,626		14,363
Total liabilities		839		393
Sales		0		0
Profit (loss) for the year		49		(551)
KOMIPO Europe B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		81,364		70,431
Total liabilities		54		97
Sales		1,195		402
Profit (loss) for the year		1,134		(503)
Haenanum Energy Fund
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		7,416		7,463
Total liabilities		3		3
Sales		0		40
Profit (loss) for the year		(48)		(74)
Paju Ecoenergy Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		61,930		57,795
Total liabilities		3,066		2,118
Sales		20,718		15,425
Profit (loss) for the year		1,290		2,234
Guam Ukudu Power LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		293,422		30,133
Total liabilities		323,292		30,438
Sales		0		0
Profit (loss) for the year		(31,410)		(2,030)
KPS Partners Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		3,619		2,809
Total liabilities		2,007		1,529
Sales		12,417		9,520
Profit (loss) for the year		487		323
KEPCO E&C Service Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		5,676		4,054
Total liabilities		1,897		1,889
Sales		16,180		15,985
Profit (loss) for the year		1,493		1,242
Moha Solar Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		29,096		32,808
Total liabilities		31,359		33,933
Sales		169		48
Profit (loss) for the year		(1,137)		(706)
Ogiri Solar Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		1,033		1,041
Total liabilities		23		1
Sales		0		0
Profit (loss) for the year		(30)		9
KHNP USA LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		1,290		766
Total liabilities		97		10
Sales		1,127		1,001
Profit (loss) for the year		392		267
KOMIPO Vanphong Power Service LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		15,940		3,758
Total liabilities		3,333		860
Sales		20,233		3,853
Profit (loss) for the year		9,871		958
Energy Innovation Fund I
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		35,310		22,616
Total liabilities		445		3,202
Sales		0		0
Profit (loss) for the year		(961)		(888)
KHNP Chile SpA
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		5,547		5,294
Total liabilities		4,147		3,879
Sales		0		0
Profit (loss) for the year		(16)		17
Yeong Yang Apollon Photovoltaic Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		1,566		1,775
Total liabilities		1,507		1,632
Sales		254		5
Profit (loss) for the year		(82)		(30)
Yeong Yang Corporation Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		1,559		1,776
Total liabilities		1,497		1,623
Sales		251		9
Profit (loss) for the year		(91)		(19)
SolarVader Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		1,568		1,772
Total liabilities		1,500		1,627
Sales		256		0
Profit (loss) for the year		(78)		(26)
Yeong Yang Innovation Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		1,557		1,773
Total liabilities		1,497		1,622
Sales		244		5
Profit (loss) for the year		(91)		(21)
Yeong Yang Horus Photovoltaic Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		1,552		1,771
Total liabilities		1,498		1,624
Sales		243		9
Profit (loss) for the year		(93)		(24)
Yeong Yang Solar Management Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		1,573		1,774
Total liabilities		1,500		1,625
Sales		262		0
Profit (loss) for the year		(75)		(23)
LSG Hydro Power Limited
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		1,144		1
Total liabilities		1,159		0
Sales		0		0
Profit (loss) for the year		(18)		0
KOEN Bio Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		261		394
Total liabilities		219		199
Sales		639		51
Profit (loss) for the year		(150)		(305)
KOMIPO Iberian Solar Group, S.L.U.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		78,094		70,993
Total liabilities		65,012		56,707
Sales		0		0
Profit (loss) for the year		(1,304)		1,354
Jeongam Wind Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		81,800		86,853
Total liabilities		68,317		74,267
Sales		10,722		10,476
Profit (loss) for the year		892		1,027
KOWEPO Europe B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		42,865		39,973
Total liabilities		2,422		1,449
Sales		0		0
Profit (loss) for the year		1,668		(744)
Yeongdeok Sunrise Wind Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		42,187		21,252
Total liabilities		22,031		768
Sales		0		0
Profit (loss) for the year		(328)		(116)
KHNP Spain, S.L.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		3		5
Total liabilities		0		0
Sales		0		0
Profit (loss) for the year		(1)		0
K-SOLAR SHINAN Co., Ltd. (formerly, TS Energy No. 25 Co., Ltd.)
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		320,227		353,324
Total liabilities		296,141		318,977
Sales		16,980		421
Profit (loss) for the year		3,690		₩ (7,525)
Western Power Changgi Solar Co., Ltd. (formerly, Sam-Yang Photovoltaic Power Co., Ltd.)
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		48,770
Total liabilities		44,647
Sales		3,447
Profit (loss) for the year		(354)
EWP Australia Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		51,105
Total liabilities		0
Sales		0
Profit (loss) for the year		15,203
Columboola Solar Farm Hold Co Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		310,271
Total liabilities		214,792
Sales		2,228
Profit (loss) for the year		2,884
Digital Innovation Growth Fund
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		12,594
Total liabilities		100
Sales		0
Profit (loss) for the year		(363)
J Wind First, LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		33,611
Total liabilities		33,611
Sales		450
Profit (loss) for the year		0
KEPCO Holding Company
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		3,273
Total liabilities		17
Sales		0
Profit (loss) for the year		(18)
KEPCO for Power Company
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		57,501
Total liabilities		58,441
Sales		0
Profit (loss) for the year		(960)
KEPCO for Maintenance Company
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		0
Total liabilities		0
Sales		0
Profit (loss) for the year		0
KOSPO Trumbull LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		37
Total liabilities		3
Sales		0
Profit (loss) for the year		0
Changjuk Wind Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		29,208
Total liabilities		3,137
Sales		9,027
Profit (loss) for the year		3,503
KA Power Limited
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets		3,937
Total liabilities		418
Sales		0
Profit (loss) for the year		₩ 442
[1]Financial information of EWP America Inc. includes that of two other subsidiaries, EWP Renewable Corporation, and California Power Holdings, LLC.[2]Financial information of EWP America Inc. includes that of three other subsidiaries, EWP Renewable Corporation, California Power Holdings, LLC and EWPRC Biomass Holdings, LLC.[3]Financial information of KOMIPO America Inc. includes that of 17 other subsidiaries including Elara Equity Holdings, LLC and CVS Equity Holdings, LLC.[4]Financial information of Energy New Industry Specialized Investment Private Investment Trust includes that of five other subsidiaries, BSK E-New Industry Fund VII, e-New Industry LB Fund 1, Songhyun e-New Industry Fund, BSK E-New Industry Fund X, and UI Carbon-Neutrality Fund.[5]Financial information of Energy New Industry Specialized Investment Private Investment Trust includes that of four other subsidiaries, BSK E-New e-New e-New E-New

Consolidated Subsidiaries - S_4

Consolidated Subsidiaries - Summary of Significant Restrictions on Abilities to Subsidiaries (Details) ₩ in Billions	12 Months Ended
	Dec. 31, 2022 KRW (₩)
Gyeonggi Green Energy Co., Ltd.
Disclosure Of Significant Restrictions On Abilities To Subsidiaries Explanatory [Line Items]
Description of significant restrictions on entity's ability to access or use assets and settle liabilities of group	Acquisition or disposal of assets of more than ￦35 billion, change in the capacity of cogeneration units (except for the change due to performance improvement of equipment, maintenance) will require unanimous consent of all directors of the Company.
Assets to which significant restrictions apply	₩ 35
KOSPO Youngnam Power [Member]
Disclosure Of Significant Restrictions On Abilities To Subsidiaries Explanatory [Line Items]
Description of significant restrictions on entity's ability to access or use assets and settle liabilities of group	Dividends can only be paid when all conditions of the loan agreement are satisfied, or prior written consent of financial institutions is obtained. Group’s shares cannot be wholly or partially transferred without prior written consent of financial institutions.
Jeongam Wind Power Co., Ltd.
Disclosure Of Significant Restrictions On Abilities To Subsidiaries Explanatory [Line Items]
Description of significant restrictions on entity's ability to access or use assets and settle liabilities of group	Dividends can only be paid when all conditions of the loan agreement are satisfied, and payments to the contracting party may be restricted depending on the financial management priority of the contract. Group’s shares cannot be wholly or partially transferred without prior consent of other stakeholders including shareholders or financial institutions.
Jeongam Wind Power Co., Ltd. | Shareholders agreements [member]
Disclosure Of Significant Restrictions On Abilities To Subsidiaries Explanatory [Line Items]
Description of significant restrictions on entity's ability to access or use assets and settle liabilities of group	When the Company requests other shareholders to transfer shares after the completion of the power generation complex, the Company has a right to purchase the shares at fair value.
Incheon Fuel Cell Co., Ltd.
Disclosure Of Significant Restrictions On Abilities To Subsidiaries Explanatory [Line Items]
Description of significant restrictions on entity's ability to access or use assets and settle liabilities of group	Acquisition or disposal of assets of more than ￦20 billion, change in the capacity of cogeneration units (except for the change due to performance improvement of equipment, maintenance) will require unanimous consent of all directors of the Company.
Assets to which significant restrictions apply	₩ 20
Gyeongju Wind Power Co., Ltd.
Disclosure Of Significant Restrictions On Abilities To Subsidiaries Explanatory [Line Items]
Description of significant restrictions on entity's ability to access or use assets and settle liabilities of group	Dividends and settlement amounts for O&M and renewable energy certificate can only be paid when all conditions of the loan agreement are satisfied and prior written consent of financial institutions is obtained.
Korea Offshore Wind Power Co., Ltd.
Disclosure Of Significant Restrictions On Abilities To Subsidiaries Explanatory [Line Items]
Description of significant restrictions on entity's ability to access or use assets and settle liabilities of group	Principals and interest payments on subordinated loans or dividends and settlement amounts for renewable energy certificate can only be paid when all conditions of the loan agreement are satisfied and prior written consent of financial institutions is obtained.
Jeju Hanlim Offshore Wind Co., Ltd.
Disclosure Of Significant Restrictions On Abilities To Subsidiaries Explanatory [Line Items]
Description of significant restrictions on entity's ability to access or use assets and settle liabilities of group	Prior approval from the lender is required when withdrawing funds (major expenditure, REC settlement, dividend payment, etc.) according to the loan agreement.
Yeongdeok Sunrise Wind Power Co., Ltd.
Disclosure Of Significant Restrictions On Abilities To Subsidiaries Explanatory [Line Items]
Description of significant restrictions on entity's ability to access or use assets and settle liabilities of group	Dividends can only be paid when all conditions of the loan agreement are satisfied.
Columboola Solar Farm Hold Co Pty., Ltd.
Disclosure Of Significant Restrictions On Abilities To Subsidiaries Explanatory [Line Items]
Description of significant restrictions on entity's ability to access or use assets and settle liabilities of group	Dividends can only be paid when all conditions of the loan agreement are satisfied.
Columboola Solar Farm Hold Co Pty., Ltd. | Shareholders agreements [member]
Disclosure Of Significant Restrictions On Abilities To Subsidiaries Explanatory [Line Items]
Description of significant restrictions on entity's ability to access or use assets and settle liabilities of group	The Company holds a call option to purchase the shares held by another shareholder at 80% of the stock’s valuation in the event of a breach of obligation specified in the shareholder agreement.
Changjuk Wind Power Co., Ltd. | Shareholders agreements [member]
Disclosure Of Significant Restrictions On Abilities To Subsidiaries Explanatory [Line Items]
Description of significant restrictions on entity's ability to access or use assets and settle liabilities of group	When other shareholders want to sell their shares after the performance guarantee period of wind power generators stipulated in the equipment supply contract is completed, the Company has an obligation to purchase the shares at fair value after consulting with the parties on the timing and size of the acquisition, taking in to account financial conditions, business conditions, and other circumstances.

Consolidated Subsidiaries - S_5

Consolidated Subsidiaries - Summary of Non-Controlling Interest Prior to Intra-Group Eliminations (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]
Current assets	₩ 2,611,740	₩ 2,312,226	₩ 2,029,674
Non-current assets of subsidiaries	6,080,580	4,940,873	4,638,564
Current liabilities of subsidiaries	(1,405,456)	(1,078,273)	(867,786)
Non-current liabilities of subsidiaries	(3,000,673)	(2,729,199)	(2,602,653)
Net assets of subsidiaries	4,286,191	3,445,627	3,197,799
Book value of non-controlling interest	1,454,860	1,546,434	1,370,650
Sales	3,663,857	3,155,329	2,769,001
Profit for the year	223,856	255,829	253,180
Profit for the year attributable to non-controlling interest of subsidiaries	37,745	88,941	101,606
Cash flows from operating activities of subsidiaries	386,465	536,907	452,206
Cash flows from investing activities of subsidiaries	(678,819)	(327,614)	(661,844)
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries	532,524	(2,308)	282,681
Dividends to non-controlling interests of subsidiaries	(42,344)	(31,516)	(81,298)
Effect of exchange rate fluctuation of subsidiaries	(2,697)	18,849	(18,239)
Net increase (decrease) of cash and cash equivalents of subsidiaries	₩ 195,129	₩ 194,318	₩ (26,494)
KEPCO Ilijan Corporation
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]
Percentage of ownership	49%	49%	49%
Current assets	₩ 230,031	₩ 234,224	₩ 236,602
Non-current assets of subsidiaries	1,101	24,845	85,464
Current liabilities of subsidiaries	(3,642)	(30,783)	(12,322)
Non-current liabilities of subsidiaries	0	(7,772)	(34,912)
Net assets of subsidiaries	227,490	220,514	274,832
Book value of non-controlling interest	111,470	108,052	134,668
Sales	23,263	60,532	81,400
Profit for the year	16,455	12,981	39,443
Profit for the year attributable to non-controlling interest of subsidiaries	8,063	6,361	19,327
Cash flows from operating activities of subsidiaries	68,475	116,440	121,835
Cash flows from investing activities of subsidiaries	22,604	2,216	7,561
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries	(9,609)	(88,927)	(31,793)
Dividends to non-controlling interests of subsidiaries	(8,834)	0	(30,319)
Effect of exchange rate fluctuation of subsidiaries	8,807	10,683	(8,153)
Net increase (decrease) of cash and cash equivalents of subsidiaries	₩ 81,443	₩ 40,412	₩ 59,131
KEPCO Plant Service & Engineering Co., Ltd.
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]
Percentage of ownership	49%	49%	49%
Current assets	₩ 861,705	₩ 793,995	₩ 755,454
Non-current assets of subsidiaries	693,748	626,710	590,403
Current liabilities of subsidiaries	(316,497)	(265,017)	(254,495)
Non-current liabilities of subsidiaries	(28,205)	(46,590)	(42,020)
Net assets of subsidiaries	1,210,751	1,109,098	1,049,342
Book value of non-controlling interest	593,268	543,458	514,177
Sales	1,425,913	1,375,668	1,299,186
Profit for the year	97,881	98,132	85,916
Profit for the year attributable to non-controlling interest of subsidiaries	47,962	48,085	42,099
Cash flows from operating activities of subsidiaries	81,419	133,160	74,159
Cash flows from investing activities of subsidiaries	27,372	(39,444)	26,748
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries	(33,187)	(30,599)	(47,809)
Dividends to non-controlling interests of subsidiaries	(26,438)	(25,269)	(42,336)
Effect of exchange rate fluctuation of subsidiaries	(486)	885	(2,171)
Net increase (decrease) of cash and cash equivalents of subsidiaries	₩ 48,680	₩ 38,733	₩ 8,591
KEPCO Engineering & Construction Company, Inc.
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]
Percentage of ownership	33.92%	33.92%	33.92%
Current assets	₩ 372,031	₩ 253,958	₩ 235,805
Non-current assets of subsidiaries	443,502	451,085	463,439
Current liabilities of subsidiaries	(243,796)	(183,100)	(186,296)
Non-current liabilities of subsidiaries	(28,323)	(8,492)	(13,873)
Net assets of subsidiaries	543,414	513,451	499,075
Book value of non-controlling interest	184,326	174,163	169,286
Sales	505,291	433,127	431,723
Profit for the year	17,954	16,452	20,160
Profit for the year attributable to non-controlling interest of subsidiaries	6,090	5,581	6,838
Cash flows from operating activities of subsidiaries	4,918	(16,270)	15,225
Cash flows from investing activities of subsidiaries	18,712	19,061	(34,333)
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries	(7,260)	(8,467)	(9,165)
Dividends to non-controlling interests of subsidiaries	(3,071)	(3,639)	(4,000)
Effect of exchange rate fluctuation of subsidiaries	5	38	(22)
Net increase (decrease) of cash and cash equivalents of subsidiaries	13,304	(9,277)	(32,295)
Others
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]
Current assets	1,147,973	1,030,049	801,813
Non-current assets of subsidiaries	4,942,229	3,838,233	3,499,258
Current liabilities of subsidiaries	(841,521)	(599,373)	(414,673)
Non-current liabilities of subsidiaries	(2,944,145)	(2,666,345)	(2,511,848)
Net assets of subsidiaries	2,304,536	1,602,564	1,374,550
Book value of non-controlling interest	565,796	720,761	552,519
Sales	1,709,390	1,286,002	956,692
Profit for the year	91,566	128,264	107,661
Profit for the year attributable to non-controlling interest of subsidiaries	(24,370)	28,914	33,342
Cash flows from operating activities of subsidiaries	231,653	303,577	240,987
Cash flows from investing activities of subsidiaries	(747,507)	(309,447)	(661,820)
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries	582,580	125,685	371,448
Dividends to non-controlling interests of subsidiaries	(4,001)	(2,608)	(4,643)
Effect of exchange rate fluctuation of subsidiaries	(11,023)	7,243	(7,893)
Net increase (decrease) of cash and cash equivalents of subsidiaries	₩ 51,702	₩ 124,450	₩ (61,921)

Consolidated Subsidiaries - S_6

Consolidated Subsidiaries - Summary of Changes in Goodwill (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill	₩ 100,093	₩ 105,647
Goodwill, Beginning	105,647	98,166
Increase	0	7,481
Decrease	0	0
Goodwill, Ending	100,093	105,647
Others [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill	(5,554)	0
Goodwill, Beginning	0
Goodwill, Ending	(5,554)	0
Acquisition cost
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill	100,093	105,647
Goodwill, Beginning	105,647	98,166
Increase	0	7,481
Decrease	0	0
Goodwill, Ending	100,093	105,647
Acquisition cost | Others [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill	(5,554)	0
Goodwill, Beginning	0
Goodwill, Ending	(5,554)	0
Less: Accumulated impairment
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill	0	0
Goodwill, Beginning	0	0
Increase	0	0
Decrease	0	0
Goodwill, Ending	0	0
Less: Accumulated impairment | Others [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill	0	0
Goodwill, Beginning	0
Goodwill, Ending	₩ 0	₩ 0

Consolidated Subsidiaries - S_7

Consolidated Subsidiaries - Summary of Cash Dividends Received from Subsidiaries (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Subsidiaries
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	₩ 466,268	₩ 454,255	₩ 362,162
Korea Hydro & Nuclear Power Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	136,010	279,779	106,675
Korea South-East Power Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	4,808	0	11,905
Korea Midland Power Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	24,694	0	0
Korea East-West Power Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	4,866	0	17,959
KEPCO Engineering & Construction Company, Inc.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	5,983	7,089	7,793
KEPCO Plant Service & Engineering Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	27,517	26,301	44,068
KEPCO Nuclear Fuel Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	11,184	5,206	7,270
KEPCO KDN Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	36,986	18,854	14,720
KEPCO International HongKong Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	9,044	0	11,858
KEPCO Ilijan Corporation
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	9,195	7,955	34,502
KEPCO Philippines Holdings Inc.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	34,913	60,520	70,876
KOSEP Australia Pty., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	0	1,856
KOSPO Australia Pty., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	31,386	3,095	0
Qatrana Electric Power Company
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	2,751	2,615	0
KEPCO KPS Philippines Corp.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	302	0	1,215
Tamra Offshore Wind Power Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	2,877	0	2,640
KEPCO Netherlands S3 B.V.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	4,005	0	6,981
PT. KOMIPO Pembangkitan Jawa Bali
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	859	153	0
KEPCO Netherlands J3 B.V.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	46,510	27,237	0
Gyeongju Wind Power Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	2,100	2,800	2,800
VI Carbon Professional Private Special Asset Investment Trust 1
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	0	7
KOSPO Power Services Ltda.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	305	0	0
KEPCO Netherlands B.V.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	16,795	0	11,098
PT. Cirebon Power Service
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	241	0	221
Chitose Solar Power Plant LLC
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	639	0	858
Fujeij Wind Power Company
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	15,102	11,920	6,306
KOSPO Jordan LLC
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	11,450	731	535
Energy Innovation Fund I
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	0	19
KEPCO Energy Solution Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	1,707	0	0
KEPCO Solar Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	1,409	0	0
KEPCO Philippines Corporation
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	2,375	0	0
PT. EWP Indonesia
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	4,262	0	0
EWP America Inc.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	3,887	0	0
KOWEPO Lao International
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	₩ 12,106	₩ 0	₩ 0

Investments in Associates 1 (De

Investments in Associates 1 (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Disclosure of associates [line items]
Acquisition cost		₩ 3,089,683		₩ 3,059,835
Book value		₩ 5,844,464		₩ 5,232,373		₩ 4,250,787
Korea Gas Corporation
Disclosure of associates [line items]
Key operation activities		Importing and wholesaling LNG		Importing and wholesaling LNG	[1]
Location		KOREA		Korea	[1]
Percentage of ownership		20.47%		20.47%	[1]
Acquisition cost		₩ 94,500		₩ 94,500	[1]
The fair value of associates		684,180		738,990
Book value		₩ 2,085,296		₩ 1,815,513	[1]	1,647,325
Korea Electric Power Industrial Development Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Electricity metering and others		Electricity metering and others
Location		KOREA		Korea
Percentage of ownership		29%		29%
Acquisition cost		₩ 4,727		₩ 4,727
The fair value of associates		80,454		115,339
Book value		₩ 31,078		₩ 24,617		25,630
YTN Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Broadcasting	[2]	Broadcasting
Location		KOREA	[2]	Korea
Percentage of ownership		21.43%	[2]	21.43%
Acquisition cost		₩ 59,000	[2]	₩ 59,000
The fair value of associates		50,220		26,550
Book value		₩ 55,027	[2]	₩ 51,828		40,549
Gangwon Wind Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation	[3]	Power generation	[4]
Location		KOREA	[3]	Korea	[4]
Percentage of ownership		15%	[3]	15%	[4]
Acquisition cost		₩ 5,725	[3]	₩ 5,725	[4]
Book value		₩ 12,158	[3]	₩ 10,554	[4]	11,443
Hyundai Green Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation equipment consignment and operation service		Power generation equipment consignment and operation service
Location		KOREA		Korea
Percentage of ownership		29%		29%
Acquisition cost		₩ 88,885		₩ 88,885
Book value		₩ 119,791		₩ 121,955		132,774
Korea Power Exchange
Disclosure of associates [line items]
Key operation activities		Management of power market and others	[5]	Management of power market and others	[6]
Location		KOREA	[5]	Korea	[6]
Percentage of ownership		100%	[5]	100%	[6]
Acquisition cost		₩ 127,839	[5]	₩ 127,839	[6]
Book value		275,126	[5]	269,728	[6]	269,122
Dayone Energy Co., Ltd.
Disclosure of associates [line items]
Unrecognized equity interest		3,565		(1,244)
Accumulated unrecognized equity interest		₩ 27,017		₩ 23,452
Taebaek Wind Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation	[7]	Power generation
Location		KOREA	[7]	Korea
Percentage of ownership		60%	[7]	25%
Acquisition cost		₩ 11,494	[7]	₩ 3,810
Book value		₩ 14,501	[7]	₩ 6,800		6,392
Taebaek Guinemi Wind Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation	[7]	Power generation
Location		KOREA	[7]	Korea
Percentage of ownership		67.25%	[7]	25%
Acquisition cost		₩ 12,637	[7]	₩ 3,420
Book value		13,049	[7]	₩ 3,357		3,087
Pyeongchang Wind Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities				Power generation
Location				Korea
Percentage of ownership				25%
Acquisition cost				₩ 3,875
Book value		₩ 0		₩ 5,411		5,027
Daeryun Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation	[3]	Power generation	[4]
Location		KOREA	[3]	Korea	[4]
Percentage of ownership		6.85%	[3]	9.34%	[4]
Acquisition cost		₩ 40,854	[3]	₩ 40,854	[4]
Book value		26,727	[3]	₩ 25,426	[4]	26,353
Changjuk Wind Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities				Power generation
Location				Korea
Percentage of ownership				30%
Acquisition cost				₩ 3,801
Book value		₩ 0		₩ 8,355		7,867
KNH Solar Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		27%		27%
Acquisition cost		₩ 1,296		₩ 1,296
Book value		₩ 2,883		₩ 2,278		2,436
SPC Power Corporation
Disclosure of associates [line items]
Key operation activities		Power generation	[8]	Power generation
Location		PHILIPPINES	[8]	Philippines
Percentage of ownership		38%	[8]	38%
Acquisition cost		₩ 20,635	[8]	₩ 20,635
The fair value of associates		134,814		203,589
Book value		₩ 70,868	[8]	₩ 65,046		69,912
Gemeng International Energy Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		CHINA		China
Percentage of ownership		34%		34%
Acquisition cost		₩ 413,153		₩ 413,153
Book value		₩ 578,821		₩ 595,218		679,708
PT. Cirebon Electric Power
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		INDONESIA		Indonesia
Percentage of ownership		27.50%		27.50%
Acquisition cost		₩ 40,365		₩ 40,365
Book value		₩ 135,114		₩ 121,969		117,811
KNOC Nigerian East Oil Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Resources development	[9]	Resources development	[10]
Location		NIGERIA	[9]	Nigeria	[10]
Percentage of ownership		14.63%	[9]	14.63%	[10]
Acquisition cost		₩ 12	[9]	₩ 12	[10]
Book value		₩ 0	[9]	₩ 0	[10]	0
KNOC Nigerian West Oil Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Resources development	[9]	Resources development	[10]
Location		NIGERIA	[9]	Nigeria	[10]
Percentage of ownership		14.63%	[9]	14.63%	[10]
Acquisition cost		₩ 12	[9]	₩ 12	[10]
Book value		₩ 0	[9]	₩ 0	[10]	0
PT Wampu Electric Power
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		INDONESIA		Indonesia
Percentage of ownership		46%		46%
Acquisition cost		₩ 21,292		₩ 21,292
Book value		₩ 37,743		₩ 35,077		27,865
PT. Bayan Resources TBK
Disclosure of associates [line items]
Key operation activities		Resources development		Resources development
Location		INDONESIA		Indonesia
Percentage of ownership		20%		20%
Acquisition cost		₩ 615,860		₩ 615,860
The fair value of associates		1,132,601		1,495,801
Book value		₩ 684,719		₩ 661,289		425,234
S-Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		49%		49%
Acquisition cost		₩ 132,300		₩ 132,300
Book value		₩ 141,128		₩ 122,786		110,292
Pioneer Gas Power Limited
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		INDIA		India
Percentage of ownership		38.50%		38.50%
Acquisition cost		₩ 49,831		₩ 49,831
Book value		0		0		0
Unrecognized equity interest		19,248		21,691
Accumulated unrecognized equity interest		₩ 56,877		₩ 37,629
Eurasia Energy Holdings
Disclosure of associates [line items]
Key operation activities		Power generation and resources development		Power generation and resources development
Location		RUSSIA		Russia
Percentage of ownership		40%		40%
Acquisition cost		₩ 461		₩ 461
Book value		0		0		0
Unrecognized equity interest		13		15
Accumulated unrecognized equity interest		₩ 203		₩ 190
Xe-Pian Xe-Namnoy Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		LAOS		Laos
Percentage of ownership		25%		25%
Acquisition cost		₩ 87,426		₩ 87,426
Book value		₩ 115,584		₩ 92,441		64,570
PT. Mutiara Jawa
Disclosure of associates [line items]
Key operation activities		Manufacturing and operating floating coal terminal		Manufacturing and operating floating coal terminal
Location		INDONESIA		Indonesia
Percentage of ownership		29%		29%
Acquisition cost		₩ 2,978		₩ 2,978
Book value		₩ 3,597		₩ 2,569		1,780
Samcheok Eco Materials Co., Ltd.
Disclosure of associates [line items]
Key operation activities	[11]	Recycling fly ashes		Recycling fly ashes
Location	[11]	KOREA		Korea
Percentage of ownership	[11]	2.35%		2.35%
Acquisition cost	[11]	₩ 686		₩ 686
Book value		₩ 0	[11]	₩ 0	[11]	0
Noeul Green Energy Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		29%		29%
Acquisition cost		₩ 1,740		₩ 1,740
Book value		0		3,808		4,197
Unrecognized equity interest		5,470		0
Accumulated unrecognized equity interest		5,470		0
Naepo Green Energy Co., Ltd.
Disclosure of associates [line items]
Unrecognized equity interest		7,209		5,469
Accumulated unrecognized equity interest		₩ 14,956		₩ 7,747
Goseong Green Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		29%		29%
Acquisition cost		₩ 262,740		₩ 262,740
Book value		₩ 288,893		₩ 260,858		2,186
Gangneung Eco Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation	[3]	Power generation	[4]
Location		KOREA	[3]	Korea	[4]
Percentage of ownership		1.61%	[3]	1.61%	[4]
Acquisition cost		₩ 2,900	[3]	₩ 2,900	[4]
Book value		0	[3]	2,288	[4]	2,368
Unrecognized equity interest		14		0
Accumulated unrecognized equity interest		₩ 14		₩ 0
Shin Pyeongtaek Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		40%		40%
Acquisition cost		₩ 72,000		₩ 72,000
Book value		₩ 133,823		₩ 93,074		69,591
Haeng Bok Do Si Photovoltaic Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		28%		28%
Acquisition cost		₩ 194		₩ 194
Book value		₩ 278		₩ 223		210
Dongducheon Dream Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities	[12]	Power generation		Power generation
Location	[12]	KOREA		Korea
Percentage of ownership	[12]	33.61%		33.61%
Acquisition cost	[12]	₩ 148,105		₩ 148,105
Book value		₩ 89,300	[12]	₩ 74,198	[12]	80,637
Jinbhuvish Power Generation Pvt. Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation	[3]	Power generation	[4]
Location		INDIA	[3]	India	[4]
Percentage of ownership		5.16%	[3]	5.16%	[4]
Acquisition cost		₩ 9,000	[3]	₩ 9,000	[4]
Book value		₩ 0	[3]	₩ 0	[4]	0
Daejung Offshore Wind Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		46.59%		46.59%
Acquisition cost		₩ 5,190		₩ 5,190
Book value		₩ 1,555		₩ 1,704		2,165
GS Donghae Electric Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		34%		34%
Acquisition cost		₩ 204,000		₩ 204,000
Book value		₩ 260,145		₩ 243,772		244,426
Daegu Photovoltaic Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		29%		29%
Acquisition cost		₩ 1,230		₩ 1,230
Book value		₩ 2,849		₩ 2,342		2,066
Busan Green Energy Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		29%		29%
Acquisition cost		₩ 5,243		₩ 5,243
Book value		₩ 4,395		₩ 5,032		8,778
Gunsan Bio Energy Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation	[3]	Power generation	[4]
Location		KOREA	[3]	Korea	[4]
Percentage of ownership		18.87%	[3]	18.87%	[4]
Acquisition cost		₩ 1,000	[3]	₩ 1,000	[4]
Book value		0	[3]	0	[4]	0
Unrecognized equity interest		122		282
Accumulated unrecognized equity interest		3,986		₩ 3,864
Korea Electric Vehicle Charging Service
Disclosure of associates [line items]
Key operation activities	[4]			Electric vehicle charge service
Location	[4]			Korea
Percentage of ownership	[4]			17.50%
Acquisition cost	[4]			₩ 2,800
Book value		₩ 0		₩ 1,250	[4]	576
Hansuwon KNP Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Electric material agency		Electric material agency
Location		KOREA		Korea
Percentage of ownership		28.98%		28.98%
Acquisition cost		₩ 537		₩ 537
Book value		₩ 280		₩ 219
Korea Electric Power Corporation Fund
Disclosure of associates [line items]
Key operation activities		Developing electric enterprises	[13]	Developing electric enterprises	[14]
Location		KOREA	[13]	Korea	[14]
Percentage of ownership		98.09%	[13]	98.09%	[14]
Acquisition cost		₩ 23,113	[13]	₩ 48,410	[14]
Book value		₩ 28,842	[13]	₩ 47,983	[14]	41,926
Energy Infra Asset Management Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Asset management	[3]	Asset management	[4]
Location		KOREA	[3]	Korea	[4]
Percentage of ownership		9.90%	[3]	9.90%	[4]
Acquisition cost		₩ 297	[3]	₩ 297	[4]
Book value		₩ 1,184	[3]	₩ 1,066	[4]	938
Daegu clean Energy Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Renewable power generation		Renewable power generation
Location		KOREA		Korea
Percentage of ownership		28%		28%
Acquisition cost		₩ 140		₩ 140
Book value		₩ 12		₩ 12		12
YaksuESS Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Installing ESS related equipment		Installing ESS related equipment
Location		KOREA		Korea
Percentage of ownership		29%		29%
Acquisition cost		₩ 210		₩ 210
Book value		₩ 486		₩ 716		454
Nepal Water & Energy Development Company Private Limited
Disclosure of associates [line items]
Key operation activities		Construction and operation of utility plant	[15]	Construction and operation of utility plant	[16]
Location		NEPAL	[15]	Nepal	[16]
Percentage of ownership		69.06%	[15]	69.06%	[16]
Acquisition cost		₩ 70,228	[15]	₩ 70,228	[16]
Book value		₩ 69,940	[15]	₩ 66,333	[16]	42,677
Gwangyang Green Energy Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		20%		20%
Acquisition cost		₩ 26,800		₩ 26,800
Book value		₩ 25,044		₩ 25,466		926
PND Solar Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		29%		29%
Acquisition cost		₩ 1,250		₩ 1,250
Book value		₩ 1,403		₩ 1,229		1,149
Hyundai Eco Energy Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation	[3]	Power generation	[4]
Location		KOREA	[3]	Korea	[4]
Percentage of ownership		19%	[3]	19%	[4]
Acquisition cost		₩ 3,610	[3]	₩ 3,610	[4]
Book value		₩ 7,631	[3]	₩ 5,572	[4]	4,250
YeongGwang Yaksu Wind Electric Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation	[3]	Power generation	[4]
Location		KOREA	[3]	Korea	[4]
Percentage of ownership		9.63%	[3]	9.63%	[4]
Acquisition cost		₩ 533	[3]	₩ 533	[4]
Book value		₩ 156	[3]	₩ 233	[4]	312
Green Energy Electricity Generation Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		29%		29%
Acquisition cost		₩ 1,189		₩ 1,189
Book value		₩ 1,571		₩ 1,713		25
Korea Energy Solutions Co., Ltd.
Disclosure of associates [line items]
Key operation activities		R & D		R & D
Location		KOREA		Korea
Percentage of ownership		20%		20%
Acquisition cost		₩ 300		₩ 300
Book value		₩ 93		₩ 123		197
ITR Co., Ltd.
Disclosure of associates [line items]
Key operation activities		R & D		R & D
Location		KOREA		Korea
Percentage of ownership		20%		20%
Acquisition cost		₩ 50		₩ 50
Book value		0		32		40
Unrecognized equity interest		5		0
Accumulated unrecognized equity interest		₩ 5		₩ 0
Structure test network Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Technical testing and consulting		Technical testing and consulting
Location		KOREA		Korea
Percentage of ownership		20%		20%
Acquisition cost		₩ 25		₩ 25
Book value		₩ 366		₩ 306		27
Namjeongsusang Solar Power Operation Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation	[17]	Power generation	[18]
Location		KOREA	[17]	Korea	[18]
Percentage of ownership		15%	[17]	15%	[18]
Acquisition cost		₩ 969	[17]	₩ 969	[18]
Book value		₩ 373	[17]	₩ 361	[18]	103
Indeck Niles Development, LLC
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation	[19]
Location		USA		USA	[19]
Percentage of ownership		50%		56.25%	[19]
Acquisition cost		₩ 263,825		₩ 268,113	[19]
Book value		₩ 302,038		₩ 246,273	[19]	20,627
Indeck Niles Asset Management, LLC
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		USA		USA
Percentage of ownership		33.33%		33.33%
Acquisition cost		₩ 0		₩ 0
Book value		₩ 94		₩ 111		101
Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1
Disclosure of associates [line items]
Key operation activities		Holding company		Holding company
Location		KOREA		Korea
Percentage of ownership		49%		49%
Acquisition cost		₩ 6,910		₩ 7,112
Book value		₩ 6,932		₩ 7,138		7,326
Suwon New Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		39.90%		39.90%
Acquisition cost		₩ 798		₩ 798
Book value		919		₩ 1,035		1,054
KPGE Inc.
Disclosure of associates [line items]
Key operation activities				Power generation materials business
Location				Korea
Percentage of ownership				29%
Acquisition cost				₩ 287
Book value		₩ 0		₩ 309		287
Gwangbaek Solar Power Investment Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		44%		44%
Acquisition cost		₩ 4,757		₩ 4,757
Book value		₩ 5,133		₩ 4,806		4,682
Go deok Clean Energy Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Fuel cell generation		Fuel cell generation
Location		KOREA		Korea
Percentage of ownership		40%		40%
Acquisition cost		₩ 5,560		₩ 5,560
Book value		₩ 4,420		₩ 4,302
SureDataLab Co., Ltd.
Disclosure of associates [line items]
Key operation activities		R & D		R & D
Location		KOREA		Korea
Percentage of ownership		23.95%		23.95%
Acquisition cost		₩ 126		₩ 126
Book value		₩ 177		₩ 128		85
SEP Co., Ltd.
Disclosure of associates [line items]
Key operation activities		R & D		R & D
Location		KOREA		Korea
Percentage of ownership		21.26%		21.26%
Acquisition cost		₩ 27		₩ 27
Book value		0		7		14
Unrecognized equity interest		14		0
Accumulated unrecognized equity interest		₩ 14		₩ 0
Hankook Electric Power Information Co., Ltd.
Disclosure of associates [line items]
Key operation activities		R & D	[20]	R & D
Location		KOREA	[20]	Korea
Percentage of ownership		16.49%	[20]	25.25%
Acquisition cost		₩ 38	[20]	₩ 38
Book value		₩ 220	[20]	₩ 161		139
Tronix Co., Ltd.
Disclosure of associates [line items]
Key operation activities		R & D	[20]	R & D
Location		KOREA	[20]	Korea
Percentage of ownership		12.50%	[20]	20%
Acquisition cost		₩ 75	[20]	₩ 75
Book value		₩ 66	[20]	₩ 109		119
O2&B Global Co., Ltd.
Disclosure of associates [line items]
Key operation activities		R & D		R & D
Location		KOREA		Korea
Percentage of ownership		20%		20%
Acquisition cost		₩ 25		₩ 25
Book value		₩ 36		₩ 35		22
Muan Sunshine Solar Power Plant Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		20%		20%
Acquisition cost		₩ 1,570		₩ 1,570
Book value		₩ 2,562		₩ 1,268		1,096
Bigeum Resident Photovoltaic Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		29.90%		29.90%
Acquisition cost		₩ 1		₩ 1
Book value		0		0		0
Unrecognized equity interest		162		182
Accumulated unrecognized equity interest		₩ 460		₩ 298
Goesan Solar Park Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		29%		29%
Acquisition cost		₩ 1,276		₩ 1,276
Book value		₩ 2,591		₩ 1,927		1,684
Saemangeum Heemang Photovoltaic Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		35%		35%
Acquisition cost		₩ 11,022		₩ 11,022
Book value		₩ 13,010		₩ 10,238		11,022
Bitgoel Eco Energy Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		49.25%		29%
Acquisition cost		₩ 7,880		₩ 4,640
Book value		₩ 8,951		₩ 4,356		29
Jeju Gimnyeong Wind Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		30%		30%
Acquisition cost		₩ 714		₩ 714
Book value		₩ 872		₩ 911		1,578
Seoroseoro Sunny Power Plant Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		42.58%		42.58%
Acquisition cost		₩ 706		₩ 706
Book value		₩ 859		₩ 721		230
Muan Solar Park Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		20%		20%
Acquisition cost		₩ 4,400		₩ 4,400
Book value		₩ 7,838		₩ 6,083		4,180
YuDang Solar Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		20%		20%
Acquisition cost		₩ 360		₩ 360
Book value		₩ 586		₩ 565		360
Anjwa Smart Farm & Solar City Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		20%		20%
Acquisition cost		₩ 5,651		₩ 5,651
Book value		₩ 8,662		₩ 6,784		5,510
Daewon Green Energy Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		25.36%		25.36%
Acquisition cost		₩ 3,910		₩ 3,910
Book value		4,485		3,877		3,910
Samcheok Eco Materials Co., Ltd
Disclosure of associates [line items]
Unrecognized equity interest		344		(323)
Accumulated unrecognized equity interest		₩ 806		₩ 462
G.GURU Co., Ltd.
Disclosure of associates [line items]
Key operation activities		R & D		R & D
Location		KOREA		Korea
Percentage of ownership		24.65%		24.65%
Acquisition cost		₩ 493		₩ 493
Book value		₩ 300		₩ 403
UD4M Co., Ltd.
Disclosure of associates [line items]
Key operation activities		R & D	[21]	R & D	[4]
Location		KOREA	[21]	Korea	[4]
Percentage of ownership		12.50%	[21]	12.50%	[4]
Acquisition cost		₩ 75	[21]	₩ 75	[4]
Book value		₩ 161	[21]	₩ 144	[4]
Dongbu Highway Solar Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		20%		20%
Acquisition cost		₩ 190		₩ 190
Book value		₩ 352		₩ 265
Seobu Highway Solar Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		20%		20%
Acquisition cost		₩ 195		₩ 195
Book value		₩ 316		₩ 289
Korea Energy Data Co., Ltd.
Disclosure of associates [line items]
Key operation activities		R & D		R & D
Location		KOREA		Korea
Percentage of ownership		29.37%		29.37%
Acquisition cost		₩ 60		₩ 60
Book value		₩ 62		₩ 62		0
Gangneung Sacheon Fuel Cell Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation	[14]
Location		KOREA		Korea	[14]
Percentage of ownership		41%		65%	[14]
Acquisition cost		₩ 5,695		₩ 1,950	[14]
Book value		₩ 4,277		₩ 1,878	[14]
KOSTURE Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Coal recycling business	[3]	Coal recycling business	[4]
Location		KOREA	[3]	Korea	[4]
Percentage of ownership		0.82%	[3]	0.26%	[4]
Acquisition cost		₩ 1	[3]	₩ 0	[4]
Book value		1	[3]	₩ 0	[4]
Digital Innovation Growth Fund
Disclosure of associates [line items]
Key operation activities	[14]			Holding company
Location	[14]			Korea
Percentage of ownership	[14]			76.92%
Acquisition cost	[14]			₩ 10,000
Book value		₩ 0		₩ 9,890	[14]	0
Taebaek Gadeoksan Wind Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation	[22]
Location		KOREA		Korea	[22]
Percentage of ownership		34%		39.65%	[22]
Acquisition cost		₩ 12,570		₩ 12,570	[22]
Book value		₩ 20,040		₩ 16,495	[22]	0
Chuncheon Green Energy Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation	[14]
Location		KOREA		Korea	[14]
Percentage of ownership		45%		68%	[14]
Acquisition cost		₩ 9,540		₩ 3,400	[14]
Book value		₩ 9,155		₩ 3,372	[14]	0
Yeomsubong Wind Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation	[23]	Power generation
Location		KOREA	[23]	Korea
Percentage of ownership		3.81%	[23]	48.72%
Acquisition cost		₩ 95	[23]	₩ 95
Book value		₩ 62	[23]	₩ 95		0
Yeongyang Wind Power Corporation II
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		30%		30%
Acquisition cost		₩ 7,965		₩ 7,965
Book value		₩ 7,461		₩ 7,965		0
Haeparang Energy Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		25%		25%
Acquisition cost		₩ 2,241		₩ 2,241
Book value		₩ 2,188		₩ 2,241		0
Saemangeum Sebit Power Plant Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation	[24]	Power generation	[14]
Location		KOREA	[24]	Korea	[14]
Percentage of ownership		63.33%	[24]	69.55%	[14]
Acquisition cost		₩ 13,788	[24]	₩ 6,000	[14]
Book value		23,199	[24]	6,000	[14]	₩ 0
Nghi Son 2 Power LLC
Disclosure of associates [line items]
Unrecognized equity interest		(18,940)		(114,340)
Accumulated unrecognized equity interest		0		18,940
Barakah One Company
Disclosure of associates [line items]
Unrecognized equity interest		51,137		(26,502)
Accumulated unrecognized equity interest		93,973		42,836
Incheon New Power Co., Ltd.
Disclosure of associates [line items]
Unrecognized equity interest		(163)		(31)
Accumulated unrecognized equity interest		0		163
KAPES, Inc.
Disclosure of associates [line items]
Unrecognized equity interest		(355)		317
Accumulated unrecognized equity interest		3,160		3,515
Chester Solar IV SpA
Disclosure of associates [line items]
Unrecognized equity interest		(21)		21
Accumulated unrecognized equity interest		₩ 0		21
Boulder Solar III, LLC
Disclosure of associates [line items]
Key operation activities		Power generation
Location		USA
Percentage of ownership		30%
Acquisition cost		₩ 715
Book value		₩ 744
PlatformN. Co., Ltd.
Disclosure of associates [line items]
Key operation activities		R & D
Location		KOREA
Percentage of ownership		29.58%
Acquisition cost		₩ 105
Book value		₩ 84
PT. Cirebon Energi Prasarana
Disclosure of associates [line items]
Key operation activities	[17]	Power generation
Location	[17]	INDONESIA
Percentage of ownership	[17]	10%
Acquisition cost	[17]	₩ 26,710
Book value		₩ 69,035	[17]	0
Green Radiation Co., Ltd
Disclosure of associates [line items]
Key operation activities	[20]	R & D
Location	[20]	KOREA
Percentage of ownership	[20]	10%
Acquisition cost	[20]	₩ 20
Book value	[20]	₩ 11
Future Convergence Technology Laboratory. Co., Ltd
Disclosure of associates [line items]
Key operation activities		R & D
Location		KOREA
Percentage of ownership		20.12%
Acquisition cost		₩ 76
Book value		₩ 50
SC E&G. Co,. Ltd
Disclosure of associates [line items]
Key operation activities		R & D
Location		KOREA
Percentage of ownership		20%
Acquisition cost		₩ 90
Book value		₩ 214		0
Wang San Engineering. Co,. Ltd
Disclosure of associates [line items]
Key operation activities		R & D
Location		KOREA
Percentage of ownership		20%
Acquisition cost		₩ 81
Book value		₩ 166		0
ACE
Disclosure of associates [line items]
Key operation activities		R & D
Location		KOREA
Percentage of ownership		20%
Acquisition cost		₩ 20
Book value		₩ 20		0
Environment and Energy Co., Ltd
Disclosure of associates [line items]
Key operation activities	[20]	R & D
Location	[20]	KOREA
Percentage of ownership	[20]	10.54%
Acquisition cost	[20]	₩ 11
Book value		₩ 10	[20]	0
Santiago Solar Power SpA
Disclosure of associates [line items]
Key operation activities		Power generation
Location		CHILE
Percentage of ownership		50%
Acquisition cost		₩ 13,851
Book value		₩ 13,373		0
Yanggu Floating Photovoltaic Power Plant Inc
Disclosure of associates [line items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership		29%
Acquisition cost		₩ 904
Book value		903
International Offshore Power Transmission Holding Company Limited [Member]
Disclosure of associates [line items]
Unrecognized equity interest		23,378		0
Accumulated unrecognized equity interest		₩ 23,378		₩ 0
[1]Due to changes in equity, the nominal and effective percentage of ownership are 20.47%.[2]The Company is planning to sell its investments in YTN Co., Ltd. based on the resolution of the Board of Directors on November 23, 2022, but investments in YTN Co., Ltd. are not classified as assets held-for-sale as the Company hasn’t started the active selling procedures as of December 31, 2022.[3]The effective percentage of ownership is less than 20%. However, the Group can exercise significant influence by virtue of its contractual right to appoint directors to the board of directors of the entity, and by strict decision criteria of the Group’s financial and operating policy of the board of directors.[4]The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint directors to the board of directors of the entity, and by strict decision criteria of the Company’s financial and operating policy of the board of directors.[5]The effective percentage of ownership is 100%. However, the Government regulates the Group’s ability to make operating and financial decisions over the entity, as the Government requires maintaining arms-length transactions between KPX and the Group’s other subsidiaries. Accordingly, the entity is not classified as a consolidated subsidiary. The Group can exercise significant influence by virtue of right to nominate directors to the board of directors of the entity.[6]The effective percentage of ownership is 100%. However, the Government regulates the Company’s ability to make operating and financial decisions over the entity, as the Government requires maintaining arms-length transactions between KPX and the Company’s other subsidiaries. Accordingly, the entity is not classified as a consolidated subsidiary. The Company can exercise significant influence by virtue of right to nominate directors to the board of directors of the entity.[7]After addtional acquisition of the shares, the effective percentage of ownership is more than 50%. However, the Group does not hold control over relevant business while it exercises significant influence by participating in the board of directors by the shareholders’ agreement. Accordingly, the entity is classified as an associate.[8]The Company is planning to sell its investment in SPC Power Corporation, KEPCO SPC Power Corporation, KV Holdings, Inc. and time or proceeds of sales are not specified as of December 31, 2022.[9]The effective percentage of ownership is less than 20%. However, the Group can exercise significant influence by virtue of its contractual right to appoint one out of four members of the steering committee of the entity. Moreover, the Group has significant financial transactions, which can affect its significant influence on the entity.[10]The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint one out of four members of the steering committee of the entity. Moreover, the Company has significant financial transactions, which can affect its significant influence on the entity.[11]Although the nominal percentage of ownership is 2.35%, the effective percentage of ownership is 25.54%, considering redeemable convertible preferred stock as a liability component.[12]The effective percentage of ownership is 34.01% considering the conversion of redeemable convertible preferred stock into ordinary stock.[13]The effective percentage of ownership is more than 50% but the Group does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. Accordingly, the entity is classified as an associate.[14]The effective percentage of ownership is more than 50% but the Company does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. Accordingly, the entity is classified as an associate.[15]The effective percentage of ownership is more than 50% but the Group does not hold control over the entity according to the shareholders’ agreement. Accordingly, the entity is classified as an associate.[16]The effective percentage of ownership is more than 50% but the Company does not hold control over the entity according to the shareholders’ agreement. Accordingly, the entity is classified as an associate.[17]The effective percentage of ownership is less than 20%. However, the entity is classified as an associate because the Group excercises significant influence over the decisions related to finance and operation.[18]The effective percentage of ownership is less than 20%. However, the Company considers the major decision-making body to be the general decision of the board of directors, and the general decision of the board of directors can be passed only by two directors of Namjeongsusang Solar Power Operation Co., Ltd. Accordingly, the entity is classified as an associate.[19]According to the shareholders’ agreement, additional investment of 50% of total stake is agreed by March 2022.[20]The effective percentage of ownership is less than 20%. However, the entity is classified as an associate because the Group excercises significant influence over the entity.[21]The effective percentage of ownership is 14.29% due to the acquisition of treasury stocks. The effective percentage of ownership is less than 20%. However, the Group excercises significant influence over the decisions related to finance and operation by virtue of right to nominate directors to the board of directors of the entity.[22]The percentage of ownership decreased due to the unequal capital increase. The entity was reclassified from a joint venture to an associate, due to the changes in voting rights.[23]The effective percentage of ownership decreased due to the disproportionate paid-in capital increase, and the effective percentage of ownership is less than 20%. However, the Group excercises significant influence over all decisions related to finance and operation.[24]The effective percentage of ownership decreased due to the disproportionate paid-in capital increase during the year ended December 31, 2022. The effective percentage of ownership is more than 50% but the Group does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. Accordingly, the entity is classified as an associate.

Investments in Associates 2 (De

Investments in Associates 2 (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021
Book value
Beginning balance		₩ 5,232,373		₩ 4,250,787
Acquisition		95,037		568,653
Disposal		(31,398)		(3,484)
Dividends received		(599,328)		(148,395)
Share of profit (loss)		1,091,588		417,123
Other comprehensive income (loss)		45,268		161,751
Others		10,924		(14,062)
Ending balance		5,844,464		5,232,373
Korea Gas Corporation
Book value
Beginning balance		1,815,513	[1]	1,647,325
Acquisition		0		0
Disposal		0		0
Dividends received		(51,559)		0
Share of profit (loss)		305,638		209,357
Other comprehensive income (loss)		7,746		13,017
Others		7,958		(54,186)
Ending balance		2,085,296		1,815,513	[1]
Korea Electric Power Industrial Development Co., Ltd.
Book value
Beginning balance		24,617		25,630
Acquisition		0		0
Disposal		0		0
Dividends received		(1,872)		(1,966)
Share of profit (loss)		3,807		378
Other comprehensive income (loss)		0		0
Others		4,526		575
Ending balance		31,078		24,617
YTN Co., Ltd.
Book value
Beginning balance		51,828		40,549
Acquisition		0		0
Disposal		0		0
Dividends received		(450)		(270)
Share of profit (loss)		1,565		11,192
Other comprehensive income (loss)		(34)		22
Others		2,118		335
Ending balance		55,027	[2]	51,828
Gangwon Wind Power Co., Ltd.
Book value
Beginning balance		10,554	[3]	11,443
Acquisition		0		0
Disposal		0		0
Dividends received		(1,420)		(1,703)
Share of profit (loss)		3,024		814
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		12,158	[4]	10,554	[3]
Hyundai Green Power Co., Ltd.
Book value
Beginning balance		121,955		132,774
Acquisition		0		0
Disposal		0		0
Dividends received		(4,008)		(8,888)
Share of profit (loss)		1,770		(562)
Other comprehensive income (loss)		1,345		(1,346)
Others		(1,271)		(23)
Ending balance		119,791		121,955
Korea Power Exchange
Book value
Beginning balance		269,728	[5]	269,122
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		772		(10)
Other comprehensive income (loss)		0		0
Others		4,626		616
Ending balance		275,126	[6]	269,728	[5]
Taebaek Wind Power Co., Ltd.
Book value
Beginning balance		6,800		6,392
Acquisition		7,684		0
Disposal		0		0
Dividends received		(825)		0
Share of profit (loss)		842		408
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		14,501	[7]	6,800
Taebaek Guinemi Wind Power Co., Ltd.
Book value
Beginning balance		3,357		3,087
Acquisition		9,217		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		475		270
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		13,049	[7]	3,357
Pyeongchang Wind Power Co., Ltd.
Book value
Beginning balance		5,411		5,027
Acquisition		5,454		0
Disposal		0		0
Dividends received		(100)		0
Share of profit (loss)		3,695		384
Other comprehensive income (loss)		0		0
Others		(14,460)		0
Ending balance		0		5,411
Daeryun Power Co., Ltd.
Book value
Beginning balance		25,426	[3]	26,353
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		429		(927)
Other comprehensive income (loss)		1		0
Others		871		0
Ending balance		26,727	[4]	25,426	[3]
Changjuk Wind Power Co., Ltd.
Book value
Beginning balance		8,355		7,867
Acquisition		11,862		0
Disposal		0		0
Dividends received		(1,350)		(449)
Share of profit (loss)		817		937
Other comprehensive income (loss)		0		0
Others		(19,684)		0
Ending balance		0		8,355
KNH Solar Co., Ltd.
Book value
Beginning balance		2,278		2,436
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		606		(158)
Other comprehensive income (loss)		(1)		0
Others		0		0
Ending balance		2,883		2,278
SPC Power Corporation
Book value
Beginning balance		65,046		69,912
Acquisition		0		0
Disposal		0		0
Dividends received		(2,694)		(20,468)
Share of profit (loss)		1,188		5,311
Other comprehensive income (loss)		7,330		10,291
Others		(2)		0
Ending balance		70,868	[8]	65,046
Gemeng International Energy Co., Ltd.
Book value
Beginning balance		595,218		679,708
Acquisition		0		0
Disposal		0		0
Dividends received		0		(11,886)
Share of profit (loss)		(233)		(154,930)
Other comprehensive income (loss)		(16,164)		82,326
Others		0		0
Ending balance		578,821		595,218
PT. Cirebon Electric Power
Book value
Beginning balance		121,969		117,811
Acquisition		0		0
Disposal		0		0
Dividends received		(10,659)		(18,253)
Share of profit (loss)		14,776		10,679
Other comprehensive income (loss)		704		1,396
Others		8,324		10,336
Ending balance		135,114		121,969
KNOC Nigerian East Oil Co., Ltd.
Book value
Beginning balance		0	[9]	0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(11)		(14)
Other comprehensive income (loss)		(787)		(938)
Others		798		952
Ending balance		0	[10]	0	[9]
KNOC Nigerian West Oil Co., Ltd.
Book value
Beginning balance		0	[9]	0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(10)		(15)
Other comprehensive income (loss)		(724)		(862)
Others		734		877
Ending balance		0	[10]	0	[9]
PT Wampu Electric Power
Book value
Beginning balance		35,077		27,865
Acquisition		0		0
Disposal		0		0
Dividends received		(5,551)		0
Share of profit (loss)		5,848		3,196
Other comprehensive income (loss)		54		1,355
Others		2,315		2,661
Ending balance		37,743		35,077
PT. Bayan Resources TBK
Book value
Beginning balance		661,289		425,234
Acquisition		0		0
Disposal		0		0
Dividends received		(515,139)		(68,666)
Share of profit (loss)		531,528		267,874
Other comprehensive income (loss)		7,041		36,885
Others		0		(38)
Ending balance		684,719		661,289
S-Power Co., Ltd.
Book value
Beginning balance		122,786		110,292
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		18,342		12,437
Other comprehensive income (loss)		0		57
Others		0		0
Ending balance		141,128		122,786
Pioneer Gas Power Limited
Book value
Beginning balance		0		0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		0		0
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		0		0
Eurasia Energy Holdings
Book value
Beginning balance		0		0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		0		0
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		0		0
Xe-Pian Xe-Namnoy Power Co., Ltd.
Book value
Beginning balance		92,441		64,570
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		15,582		19,306
Other comprehensive income (loss)		7,561		8,565
Others		0		0
Ending balance		115,584		92,441
Hadong Mineral Fiber Co., Ltd.
Book value
Beginning balance		0		0
Acquisition				0
Disposal				0
Dividends received				0
Share of profit (loss)				0
Other comprehensive income (loss)				0
Others				0
Ending balance				0
PT. Mutiara Jawa
Book value
Beginning balance		2,569		1,780
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		1,197		630
Other comprehensive income (loss)		(169)		159
Others		0		0
Ending balance		3,597		2,569
Samcheok Eco Materials Co., Ltd.
Book value
Beginning balance		0	[11]	0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		0		0
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance	[11]	0		0
Noeul Green Energy Co., Ltd.
Book value
Beginning balance		3,808		4,197
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(3,824)		(389)
Other comprehensive income (loss)		0		0
Others		16		0
Ending balance		0		3,808
Goseong Green Power Co., Ltd.
Book value
Beginning balance		260,858		2,186
Acquisition		0		259,840
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		27,992		(1,168)
Other comprehensive income (loss)		0		0
Others		43		0
Ending balance		288,893		260,858
Gangneung Eco Power Co., Ltd.
Book value
Beginning balance		2,288	[3]	2,368
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(2,288)		(80)
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		0	[4]	2,288	[3]
Shin Pyeongtaek Power Co., Ltd.
Book value
Beginning balance		93,074		69,591
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		40,713		23,476
Other comprehensive income (loss)		0		0
Others		36		7
Ending balance		133,823		93,074
Haeng Bok Do Si Photovoltaic Power Co., Ltd.
Book value
Beginning balance		223		210
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		55		13
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		278		223
Dongducheon Dream Power Co., Ltd.
Book value
Beginning balance		74,198	[12]	80,637
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		15,086		(6,439)
Other comprehensive income (loss)		0		0
Others		16		0
Ending balance	[12]	89,300		74,198
Jinbhuvish Power Generation Pvt. Ltd.
Book value
Beginning balance		0	[3]	0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		0		0
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		0	[4]	0	[3]
Daejung Offshore Wind Power Co., Ltd.
Book value
Beginning balance		1,704		2,165
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(149)		(461)
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		1,555		1,704
GS Donghae Electric Power Co., Ltd.
Book value
Beginning balance		243,772		244,426
Acquisition		0		0
Disposal		0		0
Dividends received		0		(15,640)
Share of profit (loss)		15,717		14,972
Other comprehensive income (loss)		0		0
Others		656		14
Ending balance		260,145		243,772
Daegu Photovoltaic Co., Ltd.
Book value
Beginning balance		2,342		2,066
Acquisition		0		0
Disposal		0		0
Dividends received		(268)		(206)
Share of profit (loss)		775		482
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		2,849		2,342
Busan Green Energy Co., Ltd.
Book value
Beginning balance		5,032		8,778
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(667)		(3,750)
Other comprehensive income (loss)		0		0
Others		30		4
Ending balance		4,395		5,032
Gunsan Bio Energy Co., Ltd.
Book value
Beginning balance		0	[3]	0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		0		0
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		0	[4]	0	[3]
Korea Electric Vehicle Charging Service
Book value
Beginning balance		1,250	[3]	576
Acquisition		0		0
Disposal		(1,293)		0
Dividends received		0		0
Share of profit (loss)		43		(283)
Other comprehensive income (loss)		0		0
Others		0		957
Ending balance		0		1,250	[3]
Hansuwon KNP Co., Ltd. (formerly, Korea Nuclear Partners Co., Ltd.)
Book value
Beginning balance		219		200
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		61		19
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		280		219
Korea Electric Power Corporation Fund
Book value
Beginning balance		47,983	[13]	41,926
Acquisition		0		0
Disposal		(25,297)		(3,090)
Dividends received		0		0
Share of profit (loss)		7,966		9,065
Other comprehensive income (loss)		(1,810)		82
Others		0		0
Ending balance		28,842	[14]	47,983	[13]
Energy Infra Asset Management Co., Ltd.
Book value
Beginning balance		1,066	[3]	938
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		118		128
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		1,184	[4]	1,066	[3]
Daegu clean Energy Co., Ltd.
Book value
Beginning balance		12		12
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		0		0
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		12		12
YaksuESS Co., Ltd.
Book value
Beginning balance		716		454
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(230)		262
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		486		716
Nepal Water & Energy Development Company Private Limited
Book value
Beginning balance		66,333	[15]	42,677
Acquisition		0		19,960
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(923)		(616)
Other comprehensive income (loss)		4,530		4,312
Others		0		0
Ending balance		69,940	[16]	66,333	[15]
Gwangyang Green Energy Co., Ltd.
Book value
Beginning balance		25,466		926
Acquisition		0		24,800
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(422)		(138)
Other comprehensive income (loss)		0		(122)
Others		0		0
Ending balance		25,044		25,466
PND Solar Co., Ltd.
Book value
Beginning balance		1,229		1,149
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		174		80
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		1,403		1,229
Hyundai Eco Energy Co., Ltd.
Book value
Beginning balance		5,572	[3]	4,250
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		2,058		1,322
Other comprehensive income (loss)		1		0
Others		0		0
Ending balance		7,631	[4]	5,572	[3]
YeongGwang Yaksu Wind Electric Co., Ltd.
Book value
Beginning balance		233	[3]	312
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		143		(79)
Other comprehensive income (loss)		0		0
Others		(220)		0
Ending balance		156	[4]	233	[3]
Green Energy Electricity Generation Co., Ltd.
Book value
Beginning balance		1,713		25
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(142)		1,688
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		1,571		1,713
Korea Energy Solutions Co., Ltd.
Book value
Beginning balance		123		197
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(30)		(74)
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		93		123
ITR Co., Ltd.
Book value
Beginning balance		32		40
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(32)		(8)
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		0		32
Structure test network Co., Ltd.
Book value
Beginning balance		306		27
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		60		279
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		366		306
Namjeongsusang Solar Power Operation Co., Ltd.
Book value
Beginning balance		361	[17]	103
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		12		258
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		373	[18]	361	[17]
Indeck Niles Development, LLC
Book value
Beginning balance		246,273	[19]	20,627
Acquisition		0		222,551
Disposal		(4,289)		0
Dividends received		0		0
Share of profit (loss)		21,975		(13,160)
Other comprehensive income (loss)		21,840		6,652
Others		16,239		9,603
Ending balance		302,038		246,273	[19]
Indeck Niles Asset Management, LLC
Book value
Beginning balance		111		101
Acquisition		0		0
Disposal		0		0
Dividends received		(497)		0
Share of profit (loss)		472		567
Other comprehensive income (loss)		0		0
Others		8		(557)
Ending balance		94		111
Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1
Book value
Beginning balance		7,138		7,326
Acquisition		0		0
Disposal		(202)		(188)
Dividends received		(392)		0
Share of profit (loss)		389		399
Other comprehensive income (loss)		(1)		0
Others		0		(399)
Ending balance		6,932		7,138
Suwon New Power Co., Ltd.
Book value
Beginning balance		1,035		1,054
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(116)		(5)
Other comprehensive income (loss)		0		(14)
Others		0		0
Ending balance		919		1,035
KPGE Inc.
Book value
Beginning balance		309		287
Acquisition		0		0
Disposal		(317)		0
Dividends received		0		0
Share of profit (loss)		8		22
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		0		309
Gwangbaek Solar Power Investment Co., Ltd.
Book value
Beginning balance		4,806		4,682
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		327		124
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		5,133		4,806
Go deok Clean Energy Co., Ltd
Book value
Beginning balance		4,302		960
Acquisition		0		3,730
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		118		(333)
Other comprehensive income (loss)		0		(55)
Others		0		0
Ending balance		4,420		4,302
SureDataLab Co., Ltd.
Book value
Beginning balance		128		85
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		49		43
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		177		128
SEP Co., Ltd.
Book value
Beginning balance		7		14
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(7)		(7)
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		0		7
Hankook Electric Power Information Co., Ltd.
Book value
Beginning balance		161		139
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		121		22
Other comprehensive income (loss)		0		0
Others		(62)		0
Ending balance		220	[20]	161
Tronix Co., Ltd.
Book value
Beginning balance		109		119
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(37)		(10)
Other comprehensive income (loss)		0		0
Others		(6)		0
Ending balance		66	[20]	109
O2&B Global Co., Ltd.
Book value
Beginning balance		35		22
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		1		13
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		36		35
Muan Sunshine Solar Power Plant Co., Ltd.
Book value
Beginning balance		1,268		1,096
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		1,294		172
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		2,562		1,268
Bigeum Resident Photovoltaic Power Co., Ltd.
Book value
Beginning balance		0		0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		0		0
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		0		0
Jeju SolarOne Co., Ltd.
Book value
Beginning balance		0		159
Acquisition				45
Disposal				(206)
Dividends received				0
Share of profit (loss)				(1)
Other comprehensive income (loss)				0
Others				3
Ending balance				0
Goesan Solar Park Co., Ltd.
Book value
Beginning balance		1,927		1,684
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		664		249
Other comprehensive income (loss)		0		(6)
Others		0		0
Ending balance		2,591		1,927
Saemangeum Heemang Photovoltaic Co., Ltd.
Book value
Beginning balance		10,238		11,022
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		2,772		(784)
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		13,010		10,238
Bitgoel Eco Energy Co., Ltd.
Book value
Beginning balance		4,356		29
Acquisition		3,240		4,611
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		1,355		(261)
Other comprehensive income (loss)		0		(23)
Others		0		0
Ending balance		8,951		4,356
Jeju Gimnyeong Wind Power Co., Ltd.
Book value
Beginning balance		911		1,578
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(39)		(665)
Other comprehensive income (loss)		0		(2)
Others		0		0
Ending balance		872		911
Seoroseoro Sunny Power Plant Co., Ltd.
Book value
Beginning balance		721		230
Acquisition		0		476
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		138		15
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		859		721
Muan Solar Park Co., Ltd.
Book value
Beginning balance		6,083		4,180
Acquisition		0		220
Disposal		0		0
Dividends received		(600)		0
Share of profit (loss)		2,377		1,683
Other comprehensive income (loss)		(22)		0
Others		0		0
Ending balance		7,838		6,083
YuDang Solar Co., Ltd.
Book value
Beginning balance		565		360
Acquisition		0		0
Disposal		0		0
Dividends received		(160)		0
Share of profit (loss)		181		205
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		586		565
Anjwa Smart Farm & Solar City Co., Ltd.
Book value
Beginning balance		6,784		5,510
Acquisition		0		141
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		1,878		1,133
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		8,662		6,784
Daewon Green Energy Co., Ltd.
Book value
Beginning balance		3,877		3,910
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		608		(33)
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		4,485		3,877
G.GURU Co., Ltd.
Book value
Beginning balance		403		0
Acquisition		0		493
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(103)		(90)
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		300		403
UD4M Co., Ltd.
Book value
Beginning balance		144		0
Acquisition		0		75
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		17		217
Other comprehensive income (loss)		0		0
Others		0		(148)
Ending balance		161		144
Dongbu Highway Solar Co., Ltd.
Book value
Beginning balance		265		0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		87		74
Other comprehensive income (loss)		0		0
Others		0		191
Ending balance		352		265
Seobu Highway Solar Co., Ltd.
Book value
Beginning balance		289		0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		27		94
Other comprehensive income (loss)		0		0
Others		0		195
Ending balance		316		289
Korea Energy Data Co., Ltd.
Book value
Beginning balance		62		0
Acquisition		0		60
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		0		2
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		62		62
Gangneung Sacheon Fuel Cell Co., Ltd.
Book value
Beginning balance		1,878		0
Acquisition		3,745		1,950
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(1,310)		(72)
Other comprehensive income (loss)		(36)		0
Others		0		0
Ending balance		4,277		1,878
Kosture Co., Ltd.
Book value
Beginning balance		0		0
Acquisition		1		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		0		0
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		1		0
Digital Innovation Growth Fund
Book value
Beginning balance		9,890	[13]	0
Acquisition		0		10,000
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(204)		(110)
Other comprehensive income (loss)		0		0
Others		(9,686)		0
Ending balance		0		9,890	[13]
Taebaek Gadeoksan Wind Power Co., Ltd.
Book value
Beginning balance		16,495	[21]	0
Acquisition		0		0
Disposal		0		0
Dividends received		(1,784)		0
Share of profit (loss)		5,644		2,532
Other comprehensive income (loss)		0		0
Others		(315)		13,963
Ending balance		20,040		16,495	[21]
Chuncheon Green Energy Co., Ltd.
Book value
Beginning balance		3,372	[13]	0
Acquisition		6,140		3,400
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(357)		(28)
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		9,155		3,372	[13]
Yeomsubong Wind Power Co., Ltd.
Book value
Beginning balance		95		0
Acquisition		0		95
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(40)		0
Other comprehensive income (loss)		0		0
Others		7		0
Ending balance		62	[22]	95
Yeongyang Wind Power Corporation II
Book value
Beginning balance		7,965		0
Acquisition		0		7,965
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(504)		0
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		7,461		7,965
Haeparang Energy Co., Ltd.
Book value
Beginning balance		2,241		0
Acquisition		0		2,241
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(53)		0
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		2,188		2,241
Saemangeum Sebit Power Plant Co., Ltd.
Book value
Beginning balance		6,000	[13]	0
Acquisition		7,788		6,000
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		4,855		0
Other comprehensive income (loss)		0		0
Others		4,556		0
Ending balance		23,199	[23]	6,000	[13]
Boulder Solar III, LLC
Book value
Beginning balance		0
Acquisition		715
Disposal		0
Dividends received		0
Share of profit (loss)		0
Other comprehensive income (loss)		0
Others		29
Ending balance		744		0
PlatformN. Co., Ltd
Book value
Beginning balance		0
Acquisition		105
Disposal		0
Dividends received		0
Share of profit (loss)		(21)
Other comprehensive income (loss)		0
Others		0
Ending balance		84		0
PT. Cirebon Energi Prasarana
Book value
Beginning balance		0
Acquisition		24,052
Disposal		0
Dividends received		0
Share of profit (loss)		35,315
Other comprehensive income (loss)		6,963
Others		2,705
Ending balance		69,035	[18]	0
Green Radiation Co., Ltd
Book value
Beginning balance		0
Acquisition		0
Disposal		0
Dividends received		0
Share of profit (loss)		(9)
Other comprehensive income (loss)		0
Others		20
Ending balance		11		0
Future Convergence Technology Laboratory. Co., Ltd
Book value
Beginning balance		0
Acquisition		76
Disposal		0
Dividends received		0
Share of profit (loss)		(26)
Other comprehensive income (loss)		0
Others		0
Ending balance		50		0
SC E&G. Co,. Ltd
Book value
Beginning balance		0
Acquisition		90
Disposal		0
Dividends received		0
Share of profit (loss)		124
Other comprehensive income (loss)		0
Others		0
Ending balance		214		0
Wang San Engineering. Co,. Ltd
Book value
Beginning balance		0
Acquisition		81
Disposal		0
Dividends received		0
Share of profit (loss)		85
Other comprehensive income (loss)		0
Others		0
Ending balance		166		0
ACE
Book value
Beginning balance		0
Acquisition		20
Disposal		0
Dividends received		0
Share of profit (loss)		0
Other comprehensive income (loss)		0
Others		0
Ending balance		20		0
Environment and Energy Co., Ltd
Book value
Beginning balance		0
Acquisition		11
Disposal		0
Dividends received		0
Share of profit (loss)		(1)
Other comprehensive income (loss)		0
Others		0
Ending balance		10	[20]	0
Santiago Solar Power SpA
Book value
Beginning balance		0
Acquisition		13,853
Disposal		0
Dividends received		0
Share of profit (loss)		(379)
Other comprehensive income (loss)		(100)
Others		(1)
Ending balance		13,373		0
Yanggu Floating Photovoltaic Power Plant Inc
Book value
Beginning balance		0
Acquisition		903
Disposal		0
Dividends received		0
Share of profit (loss)		0
Other comprehensive income (loss)		0
Others		0
Ending balance		₩ 903		₩ 0
[1]Due to changes in equity, the nominal and effective percentage of ownership are 20.47%.[2]The Company is planning to sell its investments in YTN Co., Ltd. based on the resolution of the Board of Directors on November 23, 2022, but investments in YTN Co., Ltd. are not classified as assets held-for-sale as the Company hasn’t started the active selling procedures as of December 31, 2022.[3]The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint directors to the board of directors of the entity, and by strict decision criteria of the Company’s financial and operating policy of the board of directors.[4]The effective percentage of ownership is less than 20%. However, the Group can exercise significant influence by virtue of its contractual right to appoint directors to the board of directors of the entity, and by strict decision criteria of the Group’s financial and operating policy of the board of directors.[5]The effective percentage of ownership is 100%. However, the Government regulates the Company’s ability to make operating and financial decisions over the entity, as the Government requires maintaining arms-length transactions between KPX and the Company’s other subsidiaries. Accordingly, the entity is not classified as a consolidated subsidiary. The Company can exercise significant influence by virtue of right to nominate directors to the board of directors of the entity.[6]The effective percentage of ownership is 100%. However, the Government regulates the Group’s ability to make operating and financial decisions over the entity, as the Government requires maintaining arms-length transactions between KPX and the Group’s other subsidiaries. Accordingly, the entity is not classified as a consolidated subsidiary. The Group can exercise significant influence by virtue of right to nominate directors to the board of directors of the entity.[7]After addtional acquisition of the shares, the effective percentage of ownership is more than 50%. However, the Group does not hold control over relevant business while it exercises significant influence by participating in the board of directors by the shareholders’ agreement. Accordingly, the entity is classified as an associate.[8]The Company is planning to sell its investment in SPC Power Corporation, KEPCO SPC Power Corporation, KV Holdings, Inc. and time or proceeds of sales are not specified as of December 31, 2022.[9]The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint one out of four members of the steering committee of the entity. Moreover, the Company has significant financial transactions, which can affect its significant influence on the entity.[10]The effective percentage of ownership is less than 20%. However, the Group can exercise significant influence by virtue of its contractual right to appoint one out of four members of the steering committee of the entity. Moreover, the Group has significant financial transactions, which can affect its significant influence on the entity.[11]Although the nominal percentage of ownership is 2.35%, the effective percentage of ownership is 25.54%, considering redeemable convertible preferred stock as a liability component.[12]The effective percentage of ownership is 34.01% considering the conversion of redeemable convertible preferred stock into ordinary stock.[13]The effective percentage of ownership is more than 50% but the Company does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. Accordingly, the entity is classified as an associate.[14]The effective percentage of ownership is more than 50% but the Group does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. Accordingly, the entity is classified as an associate.[15]The effective percentage of ownership is more than 50% but the Company does not hold control over the entity according to the shareholders’ agreement. Accordingly, the entity is classified as an associate.[16]The effective percentage of ownership is more than 50% but the Group does not hold control over the entity according to the shareholders’ agreement. Accordingly, the entity is classified as an associate.[17]The effective percentage of ownership is less than 20%. However, the Company considers the major decision-making body to be the general decision of the board of directors, and the general decision of the board of directors can be passed only by two directors of Namjeongsusang Solar Power Operation Co., Ltd. Accordingly, the entity is classified as an associate.[18]The effective percentage of ownership is less than 20%. However, the entity is classified as an associate because the Group excercises significant influence over the decisions related to finance and operation.[19]According to the shareholders’ agreement, additional investment of 50% of total stake is agreed by March 2022.[20]The effective percentage of ownership is less than 20%. However, the entity is classified as an associate because the Group excercises significant influence over the entity.[21]The percentage of ownership decreased due to the unequal capital increase. The entity was reclassified from a joint venture to an associate, due to the changes in voting rights.[22]The effective percentage of ownership decreased due to the disproportionate paid-in capital increase, and the effective percentage of ownership is less than 20%. However, the Group excercises significant influence over all decisions related to finance and operation.[23]The effective percentage of ownership decreased due to the disproportionate paid-in capital increase during the year ended December 31, 2022. The effective percentage of ownership is more than 50% but the Group does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. Accordingly, the entity is classified as an associate.

Investments in Associates 3 (De

Investments in Associates 3 (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022		Dec. 31, 2021
Korea Gas Corporation
Disclosure of associates [line items]
Total assets	₩ 62,424,983	[1]	₩ 43,669,902	[2]
Total liabilities	52,014,243	[1]	34,550,567	[2]
Sales of Associates	51,724,287	[1]	27,520,756	[2]
Profit (loss) for the period of Associates	1,497,008	[1]	950,757	[2]
Korea Electric Power Industrial Development Co., Ltd.
Disclosure of associates [line items]
Total assets	148,112		158,163
Total liabilities	40,946		73,278
Sales of Associates	336,333		312,705
Profit (loss) for the period of Associates	15,434		7,233
YTN Co., Ltd.
Disclosure of associates [line items]
Total assets	364,115		367,950
Total liabilities	107,324		126,062
Sales of Associates	152,187		137,439
Profit (loss) for the period of Associates	7,250		51,044
Gangwon Wind Power Co., Ltd.
Disclosure of associates [line items]
Total assets	86,758		71,153
Total liabilities	6,029		1,121
Sales of Associates	40,130		19,623
Profit (loss) for the period of Associates	20,163		5,433
Hyundai Green Power Co., Ltd.
Disclosure of associates [line items]
Total assets	773,998		812,287
Total liabilities	360,926		391,754
Sales of Associates	105,374		101,818
Profit (loss) for the period of Associates	5,010		(280)
Korea Power Exchange
Disclosure of associates [line items]
Total assets	311,691		331,640
Total liabilities	36,564		61,912
Sales of Associates	118,501		110,075
Profit (loss) for the period of Associates	1,036		492
Taebaek Wind Power Co., Ltd.
Disclosure of associates [line items]
Total assets	27,562		30,375
Total liabilities	3,394		3,176
Sales of Associates	7,565		5,744
Profit (loss) for the period of Associates	551		1,588
Taebaek Guinemi Wind Power Co., Ltd.
Disclosure of associates [line items]
Total assets	44,036		43,411
Total liabilities	28,709		29,985
Sales of Associates	6,793		5,910
Profit (loss) for the period of Associates	1,906		1,371
Pyeongchang Wind Power Co., Ltd.
Disclosure of associates [line items]
Total assets			69,939
Total liabilities			48,295
Sales of Associates			10,087
Profit (loss) for the period of Associates			1,537
Daeryun Power Co., Ltd.
Disclosure of associates [line items]
Total assets	1,201,510		757,157
Total liabilities	799,370		476,152
Sales of Associates	472,211		188,193
Profit (loss) for the period of Associates	4,999		(10,232)
Changjuk Wind Power Co., Ltd.
Disclosure of associates [line items]
Total assets			29,539
Total liabilities			1,690
Sales of Associates			6,213
Profit (loss) for the period of Associates			3,265
KNH Solar Co., Ltd.
Disclosure of associates [line items]
Total assets	13,584		13,859
Total liabilities	2,905		5,423
Sales of Associates	4,348		3,222
Profit (loss) for the period of Associates	2,173		805
SPC Power Corporation
Disclosure of associates [line items]
Total assets	254,951		242,058
Total liabilities	26,417		18,535
Sales of Associates	80,630		54,042
Profit (loss) for the period of Associates	25,614		35,441
Gemeng International Energy Co., Ltd.
Disclosure of associates [line items]
Total assets	7,796,180		8,151,333
Total liabilities	5,460,183		5,976,164
Sales of Associates	3,183,398		2,511,377
Profit (loss) for the period of Associates	11,637		(404,570)
PT. Cirebon Electric Power
Disclosure of associates [line items]
Total assets	691,311		697,614
Total liabilities	199,987		254,089
Sales of Associates	287,261		273,650
Profit (loss) for the period of Associates	53,730		39,965
KNOC Nigerian East Oil Co., Ltd.
Disclosure of associates [line items]
Total assets	26,491		24,693
Total liabilities	109,974		102,722
Sales of Associates	0		0
Profit (loss) for the period of Associates	(72)		(99)
KNOC Nigerian West Oil Co., Ltd.
Disclosure of associates [line items]
Total assets	28,537		26,625
Total liabilities	105,292		98,360
Sales of Associates	0		0
Profit (loss) for the period of Associates	(72)		(99)
PT Wampu Electric Power
Disclosure of associates [line items]
Total assets	209,815		209,172
Total liabilities	127,764		132,917
Sales of Associates	21,773		20,294
Profit (loss) for the period of Associates	12,713		7,102
PT. Bayan Resources TBK
Disclosure of associates [line items]
Total assets	4,994,538		2,884,474
Total liabilities	2,518,129		743,452
Sales of Associates	6,076,844		3,264,057
Profit (loss) for the period of Associates	3,042,123		1,456,893
S-Power Co., Ltd.
Disclosure of associates [line items]
Total assets	937,067		856,963
Total liabilities	646,411		603,519
Sales of Associates	1,091,425		608,259
Profit (loss) for the period of Associates	37,104		24,998
Pioneer Gas Power Limited
Disclosure of associates [line items]
Total assets	271,340		282,577
Total liabilities	477,127		438,366
Sales of Associates	0		0
Profit (loss) for the period of Associates	(46,290)		(36,864)
Eurasia Energy Holdings
Disclosure of associates [line items]
Total assets	648		606
Total liabilities	1,156		1,082
Sales of Associates	0		0
Profit (loss) for the period of Associates	0		0
Xe-Pian Xe-Namnoy Power Co., Ltd.
Disclosure of associates [line items]
Total assets	1,371,292		1,321,406
Total liabilities	904,907		947,430
Sales of Associates	174,693		161,686
Profit (loss) for the period of Associates	61,020		76,996
PT. Mutiara Jawa
Disclosure of associates [line items]
Total assets	26,024		24,355
Total liabilities	13,622		15,498
Sales of Associates	15,421		10,958
Profit (loss) for the period of Associates	4,912		2,835
Samcheok Eco Materials Co., Ltd.
Disclosure of associates [line items]
Total assets	24,952		26,545
Total liabilities	1,609		1,854
Sales of Associates	11,907		14,281
Profit (loss) for the period of Associates	(1,127)		1,237
Noeul Green Energy Co., Ltd.
Disclosure of associates [line items]
Total assets	82,611		109,354
Total liabilities	101,472		96,222
Sales of Associates	23,493		36,029
Profit (loss) for the period of Associates	(31,970)		(1,269)
Goseong Green Power Co., Ltd.
Disclosure of associates [line items]
Total assets	5,518,258		5,483,090
Total liabilities	4,516,607		4,508,569
Sales of Associates	1,999,825		988,933
Profit (loss) for the period of Associates	26,981		124,639
Gangneung Eco Power Co., Ltd.
Disclosure of associates [line items]
Total assets	4,907,872		4,001,681
Total liabilities	4,900,408		3,851,537
Sales of Associates	435,755		0
Profit (loss) for the period of Associates	(142,387)		(4,188)
Shin Pyeongtaek Power Co., Ltd.
Disclosure of associates [line items]
Total assets	1,203,406		1,028,028
Total liabilities	839,568		764,551
Sales of Associates	957,062		653,117
Profit (loss) for the period of Associates	100,554		57,202
Haeng Bok Do Si Photovoltaic Power Co., Ltd.
Disclosure of associates [line items]
Total assets	1,788		1,823
Total liabilities	802		1,033
Sales of Associates	558		426
Profit (loss) for the period of Associates	200		46
Dongducheon Dream Power Co., Ltd.
Disclosure of associates [line items]
Total assets	1,521,089		1,398,244
Total liabilities	1,219,018		1,139,521
Sales of Associates	2,240,175		750,127
Profit (loss) for the period of Associates	43,072		(16,685)
Jinbhuvish Power Generation Pvt. Ltd.
Disclosure of associates [line items]
Total assets	60,477		62,926
Total liabilities	12,489		12,995
Sales of Associates	0		0
Profit (loss) for the period of Associates	0		0
Daejung Offshore Wind Power Co., Ltd.
Disclosure of associates [line items]
Total assets	5,350		5,321
Total liabilities	2,013		1,664
Sales of Associates	0		0
Profit (loss) for the period of Associates	(228)		(149)
GS Donghae Electric Power Co., Ltd.
Disclosure of associates [line items]
Total assets	2,130,287		2,149,060
Total liabilities	1,365,156		1,432,083
Sales of Associates	1,053,112		760,323
Profit (loss) for the period of Associates	46,226		44,035
Daegu Photovoltaic Co., Ltd.
Disclosure of associates [line items]
Total assets	13,254		13,046
Total liabilities	3,431		4,970
Sales of Associates	4,755		3,519
Profit (loss) for the period of Associates	2,914		1,621
Busan Green Energy Co., Ltd.
Disclosure of associates [line items]
Total assets	168,588		163,016
Total liabilities	153,432		145,664
Sales of Associates	72,290		45,088
Profit (loss) for the period of Associates	(7,409)		(10,843)
Gunsan Bio Energy Co., Ltd.
Disclosure of associates [line items]
Total assets	8,397		8,503
Total liabilities	29,524		28,981
Sales of Associates	0		0
Profit (loss) for the period of Associates	(649)		(1,496)
Korea Electric Vehicle Charging Service
Disclosure of associates [line items]
Total assets			13,351
Total liabilities			6,207
Sales of Associates			13,808
Profit (loss) for the period of Associates			(1,022)
Hansuwon KNP Co., Ltd. (formerly, Korea Nuclear Partners Co., Ltd.)
Disclosure of associates [line items]
Total assets	1,887		1,409
Total liabilities	368		100
Sales of Associates	2,149		836
Profit (loss) for the period of Associates	210		64
Korea Electric Power Corporation Fund
Disclosure of associates [line items]
Total assets	29,530		49,150
Total liabilities	130		237
Sales of Associates	8,034		9,773
Profit (loss) for the period of Associates	7,854		9,534
Energy Infra Asset Management Co., Ltd.
Disclosure of associates [line items]
Total assets	12,874		11,196
Total liabilities	918		426
Sales of Associates	4,954		4,703
Profit (loss) for the period of Associates	1,354		1,306
Daegu clean Energy Co., Ltd.
Disclosure of associates [line items]
Total assets	368		368
Total liabilities	324		324
Sales of Associates	0		0
Profit (loss) for the period of Associates	(1)		(1)
YaksuESS Co., Ltd.
Disclosure of associates [line items]
Total assets			6,999
Total liabilities			4,535
Sales of Associates			1,715
Profit (loss) for the period of Associates			903
YaksuESS Co., Ltd
Disclosure of associates [line items]
Total assets	5,984
Total liabilities	4,314
Sales of Associates	851
Profit (loss) for the period of Associates	(146)
Nepal Water & Energy Development Company Private Limited
Disclosure of associates [line items]
Total assets	241,061		153,184
Total liabilities	141,199		58,545
Sales of Associates	70,923		0
Profit (loss) for the period of Associates	(1,364)		(642)
Gwangyang Green Energy Co., Ltd.
Disclosure of associates [line items]
Total assets	170,390		128,375
Total liabilities	45,260		1,136
Sales of Associates	0		0
Profit (loss) for the period of Associates	(1,923)		(688)
PND Solar Co., Ltd.
Disclosure of associates [line items]
Total assets	36,174		37,152
Total liabilities	31,868		33,444
Sales of Associates	5,940		5,078
Profit (loss) for the period of Associates	217		(128)
Hyundai Eco Energy Co., Ltd.
Disclosure of associates [line items]
Total assets	181,566		186,309
Total liabilities	142,533		158,111
Sales of Associates	29,209		25,762
Profit (loss) for the period of Associates	10,270		6,921
YeongGwang Yaksu Wind Electric Co., Ltd.
Disclosure of associates [line items]
Total assets	40,712		40,484
Total liabilities	39,924		41,176
Sales of Associates	6,628		7,066
Profit (loss) for the period of Associates	1,480		(914)
Green Energy Electricity Generation Co., Ltd.
Disclosure of associates [line items]
Total assets	75,033		75,664
Total liabilities	72,300		72,442
Sales of Associates	1,404		2,796
Profit (loss) for the period of Associates	(488)		(58)
Korea Energy Solutions Co., Ltd.
Disclosure of associates [line items]
Total assets	843		654
Total liabilities	377		40
Sales of Associates	437		228
Profit (loss) for the period of Associates	(185)		(347)
ITR Co., Ltd.
Disclosure of associates [line items]
Total assets	446		529
Total liabilities	472		372
Sales of Associates	188		135
Profit (loss) for the period of Associates	(190)		(29)
Structure test network Co., Ltd.
Disclosure of associates [line items]
Total assets	1,948		1,665
Total liabilities	383		400
Sales of Associates	732		1,451
Profit (loss) for the period of Associates	202		1,134
Namjeongsusang Solar Power Operation Co., Ltd.
Disclosure of associates [line items]
Total assets	55,616		56,376
Total liabilities	53,261		54,104
Sales of Associates	7,724		7,095
Profit (loss) for the period of Associates	83		(1,280)
Indeck Niles Development, LLC
Disclosure of associates [line items]
Total assets	1,178,303		1,051,557
Total liabilities	762,139		729,078
Sales of Associates	302,041		0
Profit (loss) for the period of Associates	(22,541)		(25,184)
Indeck Niles Asset Management, LLC
Disclosure of associates [line items]
Total assets	299		347
Total liabilities	16		13
Sales of Associates	1,863		2,232
Profit (loss) for the period of Associates	1,136		1,135
Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1
Disclosure of associates [line items]
Total assets	14,356		14,778
Total liabilities	210		211
Sales of Associates	826		848
Profit (loss) for the period of Associates	796		815
Suwon New Power Co., Ltd.
Disclosure of associates [line items]
Total assets	2,142		1,997
Total liabilities	164		30
Sales of Associates	0		0
Profit (loss) for the period of Associates	11		2
KPGE Inc.
Disclosure of associates [line items]
Total assets			1,086
Total liabilities			20
Sales of Associates			709
Profit (loss) for the period of Associates			77
Gwangbaek Solar Power Investment Co., Ltd.
Disclosure of associates [line items]
Total assets	307,864		320,001
Total liabilities	296,915		309,796
Sales of Associates	10,270		14,615
Profit (loss) for the period of Associates	743		125
Go deok Clean Energy Co., Ltd
Disclosure of associates [line items]
Total assets	71,431		65,566
Total liabilities	60,382		54,811
Sales of Associates	0		0
Profit (loss) for the period of Associates	(1,101)		(2,482)
SureDataLab Co., Ltd.
Disclosure of associates [line items]
Total assets	879		612
Total liabilities	140		79
Sales of Associates	938		733
Profit (loss) for the period of Associates	203		205
SEP Co., Ltd.
Disclosure of associates [line items]
Total assets	38		132
Total liabilities	103		100
Sales of Associates	0		0
Profit (loss) for the period of Associates	(98)		(2)
Hankook Electric Power Information Co., Ltd.
Disclosure of associates [line items]
Total assets	2,334		1,512
Total liabilities	997		876
Sales of Associates	1,797		1,887
Profit (loss) for the period of Associates	392		229
Tronix Co., Ltd.
Disclosure of associates [line items]
Total assets	2,880		1,002
Total liabilities	2,354		455
Sales of Associates	1,938		2,228
Profit (loss) for the period of Associates	(226)		89
O2&B Global Co., Ltd.
Disclosure of associates [line items]
Total assets	419		231
Total liabilities	238		54
Sales of Associates	220		345
Profit (loss) for the period of Associates	5		3
Muan Sunshine Solar Power Plant Co., Ltd.
Disclosure of associates [line items]
Total assets	142,911		142,858
Total liabilities	132,573		138,987
Sales of Associates	19,591		15,582
Profit (loss) for the period of Associates	6,467		(156)
Bigeum Resident Photovoltaic Power Co., Ltd.
Disclosure of associates [line items]
Total assets	107,690		22,159
Total liabilities	109,229		23,158
Sales of Associates	0		0
Profit (loss) for the period of Associates	(537)		(608)
Goesan Solar Park Co., Ltd.
Disclosure of associates [line items]
Total assets	52,235		52,443
Total liabilities	43,299		45,799
Sales of Associates	7,642		6,388
Profit (loss) for the period of Associates	2,292		836
Saemangeum Heemang Photovoltaic Co., Ltd.
Disclosure of associates [line items]
Total assets	160,695		157,298
Total liabilities	125,635		130,158
Sales of Associates	29,543		902
Profit (loss) for the period of Associates	6,481		(2,237)
Bitgoel Eco Energy Co., Ltd.
Disclosure of associates [line items]
Total assets	85,236		51,471
Total liabilities	66,987		36,450
Sales of Associates	10,054		0
Profit (loss) for the period of Associates	3,229		(900)
Jeju Gimnyeong Wind Power Co., Ltd.
Disclosure of associates [line items]
Total assets	63,471		65,754
Total liabilities	60,564		62,716
Sales of Associates	12,231		6,915
Profit (loss) for the period of Associates	(130)		(2,085)
Seoroseoro Sunny Power Plant Co., Ltd.
Disclosure of associates [line items]
Total assets	7,015		5,833
Total liabilities	5,045		4,186
Sales of Associates	1,157		469
Profit (loss) for the period of Associates	247		36
Muan Solar Park Co., Ltd.
Disclosure of associates [line items]
Total assets	225,894		226,920
Total liabilities	188,329		198,132
Sales of Associates	36,081		30,990
Profit (loss) for the period of Associates	11,339		8,639
YuDang Solar Co., Ltd.
Disclosure of associates [line items]
Total assets	22,073		22,430
Total liabilities	19,144		19,604
Sales of Associates	3,997		3,452
Profit (loss) for the period of Associates	957		626
Anjwa Smart Farm & Solar City Co., Ltd.
Disclosure of associates [line items]
Total assets	278,806		278,981
Total liabilities	239,581		249,143
Sales of Associates	42,477		37,691
Profit (loss) for the period of Associates	9,672		5,996
Daewon Green Energy Co., Ltd.
Disclosure of associates [line items]
Total assets	141,974		131,218
Total liabilities	124,460		116,100
Sales of Associates	45,095		18
Profit (loss) for the period of Associates	4,037		(130)
G.GURU Co., Ltd.
Disclosure of associates [line items]
Total assets	1,228		1,644
Total liabilities	12		8
Sales of Associates	478		58
Profit (loss) for the period of Associates	(423)		(346)
UD4M Co., Ltd.
Disclosure of associates [line items]
Total assets	1,322		1,359
Total liabilities	197		205
Sales of Associates	1,109		1,004
Profit (loss) for the period of Associates	59		196
Dongbu Highway Solar Co., Ltd.
Disclosure of associates [line items]
Total assets	17,935		18,794
Total liabilities	16,426		17,721
Sales of Associates	2,901		2,394
Profit (loss) for the period of Associates	439		163
Seobu Highway Solar Co., Ltd.
Disclosure of associates [line items]
Total assets	18,236		19,828
Total liabilities	16,655		18,384
Sales of Associates	3,052		2,647
Profit (loss) for the period of Associates	138		315
Korea Energy Data Co., Ltd.
Disclosure of associates [line items]
Total assets	339		238
Total liabilities	128		27
Sales of Associates	308		86
Profit (loss) for the period of Associates	5		6
Gangneung Sacheon Fuel Cell Co., Ltd.
Disclosure of associates [line items]
Total assets	108,688		2,758
Total liabilities	98,470		3
Sales of Associates	0		0
Profit (loss) for the period of Associates	(2,720)		(123)
Kosture Co., Ltd.
Disclosure of associates [line items]
Total assets	180		150
Total liabilities	24		26
Sales of Associates	293		166
Profit (loss) for the period of Associates	32		11
Digital Innovation Growth Fund
Disclosure of associates [line items]
Total assets			12,857
Total liabilities			0
Sales of Associates			4
Profit (loss) for the period of Associates			(143)
Taebaek Gadeoksan Wind Power Co., Ltd.
Disclosure of associates [line items]
Total assets	197,944		166,172
Total liabilities	139,004		124,570
Sales of Associates	31,534		22,773
Profit (loss) for the period of Associates	19,406		8,732
Chuncheon Green Energy Co., Ltd.
Disclosure of associates [line items]
Total assets	159,151		4,901
Total liabilities	138,925		20
Sales of Associates	0		0
Profit (loss) for the period of Associates	(858)		(101)
Yeomsubong Wind Power Co., Ltd.
Disclosure of associates [line items]
Total assets	4,369		400
Total liabilities	2,829		396
Sales of Associates	0		0
Profit (loss) for the period of Associates	(859)		(17)
Yeongyang Wind Power Corporation II
Disclosure of associates [line items]
Total assets	104,821		28,972
Total liabilities	86,984		9,456
Sales of Associates	0		0
Profit (loss) for the period of Associates	(1,678)		(1,233)
Haeparang Energy Co., Ltd.
Disclosure of associates [line items]
Total assets	19,394		9,566
Total liabilities	10,721		681
Sales of Associates	0		0
Profit (loss) for the period of Associates	(211)		(2)
Saemangeum Sebit Power Plant Co., Ltd.
Disclosure of associates [line items]
Total assets	167,822		105,259
Total liabilities	131,383		96,963
Sales of Associates	23,159		0
Profit (loss) for the period of Associates	7,742		₩ (190)
Boulder Solar III, LLC
Disclosure of associates [line items]
Total assets	1,896
Total liabilities	0
Sales of Associates	0
Profit (loss) for the period of Associates	0
PlatformN. Co., Ltd
Disclosure of associates [line items]
Total assets	379
Total liabilities	94
Sales of Associates	486
Profit (loss) for the period of Associates	(70)
PT. Cirebon Energi Prasarana
Disclosure of associates [line items]
Total assets	3,361,288
Total liabilities	2,670,941
Sales of Associates	319,986
Profit (loss) for the period of Associates	36,451
Green Radiation Co., Ltd
Disclosure of associates [line items]
Total assets	111
Total liabilities	34
Sales of Associates	89
Profit (loss) for the period of Associates	(93)
Future Convergence Technology Laboratory. Co., Ltd
Disclosure of associates [line items]
Total assets	551
Total liabilities	302
Sales of Associates	9
Profit (loss) for the period of Associates	(130)
SC E&G. Co,. Ltd
Disclosure of associates [line items]
Total assets	1,199
Total liabilities	131
Sales of Associates	1,048
Profit (loss) for the period of Associates	609
Wang San Engineering. Co,. Ltd
Disclosure of associates [line items]
Total assets	1,275
Total liabilities	447
Sales of Associates	754
Profit (loss) for the period of Associates	499
ACE
Disclosure of associates [line items]
Total assets	100
Total liabilities	0
Sales of Associates	0
Profit (loss) for the period of Associates	0
Environment and Energy Co., Ltd
Disclosure of associates [line items]
Total assets	93
Total liabilities	0
Sales of Associates	0
Profit (loss) for the period of Associates	(7)
Santiago Solar Power SpA
Disclosure of associates [line items]
Total assets	56,138
Total liabilities	29,390
Sales of Associates	0
Profit (loss) for the period of Associates	(2,943)
Yanggu Floating Photovoltaic Power Plant Inc
Disclosure of associates [line items]
Total assets	3,115
Total liabilities	0
Sales of Associates	0
Profit (loss) for the period of Associates	₩ 0
[1]The profit for the year ended December 31, 2022 is reduced by the associate entity’s net income (loss) attributable to non-controlling interests.[2]The profit for the year ended December 31, 2021 is reduced by the associate entity’s net income (loss) attributable to non-controlling interests.

Investments in Associates 4 (De

Investments in Associates 4 (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Disclosure of associates [line items]
Book value		₩ 5,844,464		₩ 5,232,373		₩ 4,250,787
Korea Gas Corporation
Disclosure of associates [line items]
Net assets		₩ 10,410,740		₩ 9,119,335
Effective percentage of ownership		20.47%		20.47%
Share in net assets		₩ 2,131,078		₩ 1,866,728
Investment differential		0		0
Intercompany transaction		0		0
Others		(45,782)		(51,215)
Book value		2,085,296		1,815,513	[1]	1,647,325
Korea Electric Power Industrial Development Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 107,166		₩ 84,885
Effective percentage of ownership		29%		29%
Share in net assets		₩ 31,078		₩ 24,617
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		31,078		24,617		25,630
YTN Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 256,791		₩ 241,863
Effective percentage of ownership		21.43%		21.43%
Share in net assets		₩ 55,027		₩ 51,828
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		55,027	[2]	51,828		40,549
Gangwon Wind Power Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 80,729		₩ 70,032
Effective percentage of ownership		15%		15%
Share in net assets		₩ 12,109		₩ 10,505
Investment differential		49		49
Intercompany transaction		0		0
Others		0		0
Book value		12,158	[3]	10,554	[4]	11,443
Hyundai Green Power Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 413,072		₩ 420,533
Effective percentage of ownership		29%		29%
Share in net assets		₩ 119,791		₩ 121,955
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		119,791		121,955		132,774
Korea Power Exchange
Disclosure of associates [line items]
Net assets		₩ 275,126		₩ 269,728
Effective percentage of ownership		100%		100%
Share in net assets		₩ 275,126		₩ 269,728
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		275,126	[5]	269,728	[6]	269,122
Taebaek Wind Power Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 24,168		₩ 27,199
Effective percentage of ownership		60%		25%
Share in net assets		₩ 14,501		₩ 6,800
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		14,501	[7]	6,800		6,392
Taebaek Guinemi Wind Power Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 15,327		₩ 13,426
Effective percentage of ownership		67.25%		25%
Share in net assets		₩ 10,307		₩ 3,357
Investment differential		0		0
Intercompany transaction		0		0
Others		2,742		0
Book value		13,049	[7]	3,357		3,087
Pyeongchang Wind Power Co., Ltd.
Disclosure of associates [line items]
Net assets				₩ 21,644
Effective percentage of ownership				25%
Share in net assets				₩ 5,411
Investment differential				0
Intercompany transaction				0
Others				0
Book value		0		5,411		5,027
Daeryun Power Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 402,140		₩ 281,005
Effective percentage of ownership		6.85%		9.34%
Share in net assets		₩ 27,547		₩ 26,246
Investment differential		0		0
Intercompany transaction		0		0
Others		(820)		(820)
Book value		26,727	[3]	25,426	[4]	26,353
Changjuk Wind Power Co., Ltd.
Disclosure of associates [line items]
Net assets				₩ 27,849
Effective percentage of ownership				30%
Share in net assets				₩ 8,355
Investment differential				0
Intercompany transaction				0
Others				0
Book value		0		8,355		7,867
KNH Solar Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 10,679		₩ 8,436
Effective percentage of ownership		27%		27%
Share in net assets		₩ 2,883		₩ 2,278
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		2,883		2,278		2,436
SPC Power Corporation
Disclosure of associates [line items]
Net assets		₩ 228,534		₩ 223,523
Effective percentage of ownership		38%		38%
Share in net assets		₩ 86,843		₩ 84,939
Investment differential		0		0
Intercompany transaction		0		0
Others		(15,975)		(19,893)
Book value		70,868	[8]	65,046		69,912
Gemeng International Energy Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 2,335,997		₩ 2,175,169
Effective percentage of ownership		34%		34%
Share in net assets		₩ 794,239		₩ 739,557
Investment differential		0		0
Intercompany transaction		0		0
Others		(215,418)		(144,339)
Book value		578,821		595,218		679,708
PT. Cirebon Electric Power
Disclosure of associates [line items]
Net assets		₩ 491,324		₩ 443,525
Effective percentage of ownership		27.50%		27.50%
Share in net assets		₩ 135,114		₩ 121,969
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		135,114		121,969		117,811
KNOC Nigerian East Oil Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ (83,483)		₩ (78,029)
Effective percentage of ownership		14.63%		14.63%
Share in net assets		₩ (12,214)		₩ (11,416)
Investment differential		0		0
Intercompany transaction		0		0
Others		12,214		11,416
Book value		0	[9]	0	[10]	0
KNOC Nigerian West Oil Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ (76,755)		₩ (71,735)
Effective percentage of ownership		14.63%		14.63%
Share in net assets		₩ (11,229)		₩ (10,495)
Investment differential		0		0
Intercompany transaction		0		0
Others		11,229		10,495
Book value		0	[9]	0	[10]	0
PT Wampu Electric Power
Disclosure of associates [line items]
Net assets		₩ 82,051		₩ 76,255
Effective percentage of ownership		46%		46%
Share in net assets		₩ 37,743		₩ 35,077
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		37,743		35,077		27,865
PT. Bayan Resources TBK
Disclosure of associates [line items]
Net assets		₩ 2,476,409		₩ 2,141,022
Effective percentage of ownership		20%		20%
Share in net assets		₩ 495,282		₩ 428,204
Investment differential		265,817		309,464
Intercompany transaction		0		0
Others		(76,380)		(76,379)
Book value		684,719		661,289		425,234
S-Power Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 290,656		₩ 253,444
Effective percentage of ownership		49%		49%
Share in net assets		₩ 142,421		₩ 124,188
Investment differential		0		0
Intercompany transaction		(1,293)		(1,402)
Others		0		0
Book value		141,128		122,786		110,292
Pioneer Gas Power Limited
Disclosure of associates [line items]
Net assets		₩ (205,787)		₩ (155,789)
Effective percentage of ownership		38.50%		38.50%
Share in net assets		₩ (79,223)		₩ (59,975)
Investment differential		22,278		22,278
Intercompany transaction		0		0
Others		56,945		37,697
Book value		0		0		0
Eurasia Energy Holdings
Disclosure of associates [line items]
Net assets		₩ (508)		₩ (476)
Effective percentage of ownership		40%		40%
Share in net assets		₩ (203)		₩ (190)
Investment differential		0		0
Intercompany transaction		0		0
Others		203		190
Book value		0		0		0
Xe-Pian Xe-Namnoy Power Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 466,385		₩ 373,976
Effective percentage of ownership		25%		25%
Share in net assets		₩ 116,596		₩ 93,494
Investment differential		305		305
Intercompany transaction		(1,028)		(1,069)
Others		(289)		(289)
Book value		115,584		92,441		64,570
PT. Mutiara Jawa
Disclosure of associates [line items]
Net assets		₩ 12,402		₩ 8,857
Effective percentage of ownership		29%		29%
Share in net assets		₩ 3,597		₩ 2,569
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		3,597		2,569		1,780
Samcheok Eco Materials Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 23,343		₩ 24,691
Effective percentage of ownership		25.54%		25.54%
Share in net assets		₩ 5,962		₩ 6,306
Investment differential		0		0
Intercompany transaction		0		0
Others		(5,962)		(6,306)
Book value		0	[11]	0	[11]	0
Noeul Green Energy Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ (18,861)		₩ 13,132
Effective percentage of ownership		29%		29%
Share in net assets		₩ (5,470)		₩ 3,808
Investment differential		0		0
Intercompany transaction		0		0
Others		5,470		0
Book value		0		3,808		4,197
Goseong Green Power Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 1,001,651		₩ 902,746
Effective percentage of ownership		29%		29%
Share in net assets		₩ 290,479		₩ 261,796
Investment differential		0		0
Intercompany transaction		(1,586)		(938)
Others		0		0
Book value		288,893		260,858		2,186
Gangneung Eco Power Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 7,464		₩ 150,144
Effective percentage of ownership		1.61%		1.61%
Share in net assets		₩ 120		₩ 2,419
Investment differential		0		0
Intercompany transaction		(134)		(131)
Others		14		0
Book value		0	[3]	2,288	[4]	2,368
Shin Pyeongtaek Power Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 363,838		₩ 263,477
Effective percentage of ownership		40%		40%
Share in net assets		₩ 145,535		₩ 105,391
Investment differential		3,559		3,559
Intercompany transaction		(15,271)		(15,876)
Others		0		0
Book value		133,823		93,074		69,591
Haeng Bok Do Si Photovoltaic Power Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 986		₩ 790
Effective percentage of ownership		28%		28%
Share in net assets		₩ 276		₩ 221
Investment differential		0		0
Intercompany transaction		0		0
Others		2		2
Book value		278		223		210
Dongducheon Dream Power Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 302,071		₩ 258,723
Effective percentage of ownership		34.01%		34.01%
Share in net assets		₩ 102,734		₩ 87,992
Investment differential		1,757		1,757
Intercompany transaction		(2,609)		(2,969)
Others		(12,582)		(12,582)
Book value		89,300	[12]	74,198	[12]	80,637
Jinbhuvish Power Generation Pvt. Ltd.
Disclosure of associates [line items]
Net assets		₩ 47,988		₩ 49,931
Effective percentage of ownership		5.16%		5.16%
Share in net assets		₩ 2,496		₩ 2,576
Investment differential		0		0
Intercompany transaction		0		0
Others		(2,496)		(2,576)
Book value		0	[3]	0	[4]	0
Daejung Offshore Wind Power Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 3,337		₩ 3,657
Effective percentage of ownership		46.59%		46.59%
Share in net assets		₩ 1,555		₩ 1,704
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		1,555		1,704		2,165
GS Donghae Electric Power Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 765,131		₩ 716,977
Effective percentage of ownership		34%		34%
Share in net assets		₩ 260,145		₩ 243,772
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		260,145		243,772		244,426
Daegu Photovoltaic Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 9,823		₩ 8,076
Effective percentage of ownership		29%		29%
Share in net assets		₩ 2,849		₩ 2,342
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		2,849		2,342		2,066
Busan Green Energy Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 15,156		₩ 17,352
Effective percentage of ownership		29%		29%
Share in net assets		₩ 4,395		₩ 5,032
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		4,395		5,032		8,778
Gunsan Bio Energy Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ (21,127)		₩ (20,478)
Effective percentage of ownership		18.87%		18.87%
Share in net assets		₩ (3,986)		₩ (3,864)
Investment differential		0		0
Intercompany transaction		0		0
Others		3,986		3,864
Book value		0	[3]	0	[4]	0
Hansuwon KNP Co., Ltd. (formerly, Korea Nuclear Partners Co., Ltd.)
Disclosure of associates [line items]
Net assets		₩ 1,519		₩ 1,309
Effective percentage of ownership		28.98%		28.98%
Share in net assets		₩ 440		₩ 379
Investment differential		0		0
Intercompany transaction		0		0
Others		(160)		(160)
Book value		280		219		200
Korea Electric Vehicle Charging Service
Disclosure of associates [line items]
Net assets				₩ 7,144
Effective percentage of ownership				17.50%
Share in net assets				₩ 1,250
Investment differential				0
Intercompany transaction				0
Others				0
Book value		0		1,250	[4]	576
Korea Electric Power Corporation Fund
Disclosure of associates [line items]
Net assets		₩ 29,400		₩ 48,913
Effective percentage of ownership		98.09%		98.09%
Share in net assets		₩ 28,838		₩ 47,979
Investment differential		0		0
Intercompany transaction		0		0
Others		4		4
Book value		28,842	[13]	47,983	[14]	41,926
Energy Infra Asset Management Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 11,956		₩ 10,770
Effective percentage of ownership		9.90%		9.90%
Share in net assets		₩ 1,184		₩ 1,066
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		1,184	[3]	1,066	[4]	938
Daegu clean Energy Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 44		₩ 44
Effective percentage of ownership		28%		28%
Share in net assets		₩ 12		₩ 12
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		12		12		12
YaksuESS Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 1,670		₩ 2,464
Effective percentage of ownership		29%		29%
Share in net assets		₩ 484		₩ 715
Investment differential		2		1
Intercompany transaction		0		0
Others		0		0
Book value		486		716
Nepal Water & Energy Development Company Private Limited
Disclosure of associates [line items]
Net assets		₩ 99,862		₩ 94,639
Effective percentage of ownership		69.06%		69.06%
Share in net assets		₩ 68,968		₩ 65,361
Investment differential		972		972
Intercompany transaction		0		0
Others		0		0
Book value		69,940		66,333
Gwangyang Green Energy Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 125,130		₩ 127,239
Effective percentage of ownership		20%		20%
Share in net assets		₩ 25,026		₩ 25,448
Investment differential		18		18
Intercompany transaction		0		0
Others		0		0
Book value		25,044		25,466		926
PND Solar Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 4,306		₩ 3,708
Effective percentage of ownership		29%		29%
Share in net assets		₩ 1,249		₩ 1,075
Investment differential		154		154
Intercompany transaction		0		0
Others		0		0
Book value		1,403		1,229		1,149
Hyundai Eco Energy Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 39,033		₩ 28,198
Effective percentage of ownership		19%		19%
Share in net assets		₩ 7,416		₩ 5,358
Investment differential		215		214
Intercompany transaction		0		0
Others		0		0
Book value		7,631	[3]	5,572	[4]	4,250
YeongGwang Yaksu Wind Electric Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 788		₩ (692)
Effective percentage of ownership		9.63%		9.63%
Share in net assets		₩ 76		₩ (67)
Investment differential		300		300
Intercompany transaction		0		0
Others		(220)		0
Book value		156	[3]	233	[4]	312
Green Energy Electricity Generation Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 2,733		₩ 3,222
Effective percentage of ownership		29%		29%
Share in net assets		₩ 793		₩ 934
Investment differential		778		779
Intercompany transaction		0		0
Others		0		0
Book value		1,571		1,713		25
Korea Energy Solutions Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 466		₩ 614
Effective percentage of ownership		20%		20%
Share in net assets		₩ 93		₩ 123
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		93		123		197
ITR Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ (26)		₩ 157
Effective percentage of ownership		20%		20%
Share in net assets		₩ (5)		₩ 31
Investment differential		1		1
Intercompany transaction		0		0
Others		4		0
Book value		0		32		40
Structure Test Network Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 1,565		₩ 1,265
Effective percentage of ownership		20%		20%
Share in net assets		₩ 313		₩ 253
Investment differential		53		53
Intercompany transaction		0		0
Others		0		0
Book value		366		306		27
Namjeongsusang Solar Power Operation Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 2,355		₩ 2,272
Effective percentage of ownership		15%		15%
Share in net assets		₩ 353		₩ 341
Investment differential		20		20
Intercompany transaction		0		0
Others		0		0
Book value		373	[15]	361	[16]	103
Indeck Niles Development, LLC
Disclosure of associates [line items]
Net assets		₩ 416,164		₩ 322,479
Effective percentage of ownership		50%		56.25%
Share in net assets		₩ 208,082		₩ 181,395
Investment differential		93,956		64,878
Intercompany transaction		0		0
Others		0		0
Book value		302,038		246,273	[17]	20,627
Indeck Niles Asset Management, LLC
Disclosure of associates [line items]
Net assets		₩ 283		₩ 334
Effective percentage of ownership		33.33%		33.33%
Share in net assets		₩ 94		₩ 111
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		94		111		101
Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1
Disclosure of associates [line items]
Net assets		₩ 14,146		₩ 14,567
Effective percentage of ownership		49%		49%
Share in net assets		₩ 6,932		₩ 7,138
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		6,932		7,138		7,326
Suwon New Power Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 1,978		₩ 1,967
Effective percentage of ownership		33.05%		39.90%
Share in net assets		₩ 654		₩ 785
Investment differential		0		0
Intercompany transaction		265		250
Others		0		0
Book value		919		1,035		1,054
KPGE Inc.
Disclosure of associates [line items]
Net assets				₩ 1,066
Effective percentage of ownership				29%
Share in net assets				₩ 309
Investment differential				0
Intercompany transaction				0
Others				0
Book value		0		309		287
Gwangbaek Solar Power Investment Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 10,949		₩ 10,205
Effective percentage of ownership		44%		44%
Share in net assets		₩ 4,818		₩ 4,490
Investment differential		315		316
Intercompany transaction		0		0
Others		0		0
Book value		5,133		4,806		4,682
Go deok Clean Energy Co., Ltd
Disclosure of associates [line items]
Net assets		₩ 11,049		₩ 10,755
Effective percentage of ownership		40%		40%
Share in net assets		₩ 4,420		₩ 4,302
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		4,420		4,302		960
SureDataLab Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 739		₩ 533
Effective percentage of ownership		23.95%		23.95%
Share in net assets		₩ 177		₩ 128
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		177		128		85
SEP Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ (65)		₩ 32
Effective percentage of ownership		21.26%		21.26%
Share in net assets		₩ (14)		₩ 7
Investment differential		0		0
Intercompany transaction		0		0
Others		14		0
Book value		0		7		14
Hankook Electric Power Information Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 1,337		₩ 636
Effective percentage of ownership		16.49%		25.25%
Share in net assets		₩ 220		₩ 161
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		220	[18]	161		139
Tronix Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 526		₩ 547
Effective percentage of ownership		12.50%		20%
Share in net assets		₩ 66		₩ 109
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		66	[18]	109		119
O2&B Global Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 181		₩ 177
Effective percentage of ownership		20%		20%
Share in net assets		₩ 36		₩ 35
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		36		35		22
Muan Sunshine Solar Power Plant Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 10,338		₩ 3,871
Effective percentage of ownership		20%		20%
Share in net assets		₩ 2,068		₩ 774
Investment differential		494		494
Intercompany transaction		0		0
Others		0		0
Book value		2,562		1,268		1,096
Bigeum Resident Photovoltaic Power Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ (1,539)		₩ (999)
Effective percentage of ownership		29.90%		29.90%
Share in net assets		₩ (460)		₩ (299)
Investment differential		24		24
Intercompany transaction		0		0
Others		436		275
Book value		0		0		0
Goesan Solar Park Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 8,936		₩ 6,644
Effective percentage of ownership		29%		29%
Share in net assets		₩ 2,591		₩ 1,927
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		2,591		1,927		1,684
Saemangeum Heemang Photovoltaic Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 35,060		₩ 27,140
Effective percentage of ownership		35%		35%
Share in net assets		₩ 12,271		₩ 9,499
Investment differential		739		739
Intercompany transaction		0		0
Others		0		0
Book value		13,010		10,238		11,022
Bitgoel Eco Energy Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 18,249		₩ 15,021
Effective percentage of ownership		49.05%		29%
Share in net assets		₩ 8,951		₩ 4,356
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		8,951		4,356		29
Jeju Gimnyeong Wind Power Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 2,907		₩ 3,038
Effective percentage of ownership		30%		30%
Share in net assets		₩ 872		₩ 911
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		872		911		1,578
Seoroseoro Sunny Power Plant Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 1,970		₩ 1,647
Effective percentage of ownership		42.58%		42.58%
Share in net assets		₩ 839		₩ 701
Investment differential		20		20
Intercompany transaction		0		0
Others		0		0
Book value		859		721		230
Muan Solar Park Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 37,565		₩ 28,788
Effective percentage of ownership		20%		20%
Share in net assets		₩ 7,513		₩ 5,758
Investment differential		325		325
Intercompany transaction		0		0
Others		0		0
Book value		7,838		6,083		4,180
YuDang Solar Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 2,929		₩ 2,826
Effective percentage of ownership		20%		20%
Share in net assets		₩ 586		₩ 565
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		586		565		360
Anjwa Smart Farm & Solar City Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 39,225		₩ 29,838
Effective percentage of ownership		20%		20%
Share in net assets		₩ 7,845		₩ 5,968
Investment differential		817		816
Intercompany transaction		0		0
Others		0		0
Book value		8,662		6,784		5,510
Daewon Green Energy Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 17,514		₩ 15,118
Effective percentage of ownership		25.36%		25.36%
Share in net assets		₩ 4,441		₩ 3,833
Investment differential		44		44
Intercompany transaction		0		0
Others		0		0
Book value		4,485		3,877		3,910
G.GURU Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 1,216		₩ 1,636
Effective percentage of ownership		24.65%		24.65%
Share in net assets		₩ 300		₩ 403
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		300		403		0
UD4M Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 1,125		₩ 1,154
Effective percentage of ownership		14.29%		12.50%
Share in net assets		₩ 161		₩ 144
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		161		144		0
Dongbu Highway Solar Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 1,509		₩ 1,073
Effective percentage of ownership		20%		20%
Share in net assets		₩ 302		₩ 215
Investment differential		50		50
Intercompany transaction		0		0
Others		0		0
Book value		352		265
Seobu Highway Solar Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 1,581		₩ 1,444
Effective percentage of ownership		20%		20%
Share in net assets		₩ 316		₩ 289
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		316		289
Korea Energy Data Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 211		₩ 211
Effective percentage of ownership		29.37%		29.37%
Share in net assets		₩ 62		₩ 62
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		62		62		0
Gangneung Sacheon Fuel Cell Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 10,218		₩ 2,755
Effective percentage of ownership		41%		65%
Share in net assets		₩ 4,189		₩ 1,791
Investment differential		88		87
Intercompany transaction		0		0
Others		0		0
Book value		4,277		1,878		0
Kosture Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 156		₩ 124
Effective percentage of ownership		0.82%		0.26%
Share in net assets		₩ 1		₩ 0
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		1		0		0
Digital Innovation Growth Fund
Disclosure of associates [line items]
Net assets				₩ 12,857
Effective percentage of ownership				76.92%
Share in net assets				₩ 9,890
Investment differential				0
Intercompany transaction				0
Others				0
Book value		0		9,890	[14]	0
Taebaek Gadeoksan Wind Power Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 58,940		₩ 41,602
Effective percentage of ownership		34%		39.65%
Share in net assets		₩ 20,040		₩ 16,495
Investment differential		0		0
Intercompany transaction		0		0
Others		0		0
Book value		20,040		16,495	[19]	0
Chuncheon Green Energy Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 20,226		₩ 4,881
Effective percentage of ownership		45%		68%
Share in net assets		₩ 9,102		₩ 3,319
Investment differential		53		53
Intercompany transaction		0		0
Others		0		0
Book value		9,155		3,372	[14]	0
Yeomsubong Wind Power Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 1,540		₩ 4
Effective percentage of ownership		3.81%		48.72%
Share in net assets		₩ 59		₩ 2
Investment differential		3		93
Intercompany transaction		0		0
Others		0		0
Book value		62	[20]	95		0
Yeongyang Wind Power Corporation II
Disclosure of associates [line items]
Net assets		₩ 17,837		₩ 19,516
Effective percentage of ownership		30%		30%
Share in net assets		₩ 5,351		₩ 5,855
Investment differential		2,110		2,110
Intercompany transaction		0		0
Others		0		0
Book value		7,461		7,965		0
Haeparang Energy Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 8,673		₩ 8,885
Effective percentage of ownership		25%		25%
Share in net assets		₩ 2,168		₩ 2,221
Investment differential		20		20
Intercompany transaction		0		0
Others		0		0
Book value		2,188		2,241		0
Saemangeum Sebit Power Plant Co., Ltd.
Disclosure of associates [line items]
Net assets		₩ 36,439		₩ 8,296
Effective percentage of ownership		63.09%		69.55%
Share in net assets		₩ 22,990		₩ 5,770
Investment differential		209		230
Intercompany transaction		0		0
Others		0		0
Book value		23,199	[21]	6,000	[14]	₩ 0
Boulder Solar III, LLC
Disclosure of associates [line items]
Net assets		₩ 1,896
Effective percentage of ownership		30%
Share in net assets		₩ 569
Investment differential		175
Intercompany transaction		0
Others		0
Book value		744
PlatformN. Co., Ltd [Member]
Disclosure of associates [line items]
Net assets		₩ 285
Effective percentage of ownership		29.58%
Share in net assets		₩ 84
Investment differential		0
Intercompany transaction		0
Others		0
Book value		84		0
PT. Cirebon Energi Prasarana
Disclosure of associates [line items]
Net assets		₩ 690,347
Effective percentage of ownership		10%
Share in net assets		₩ 69,035
Investment differential		0
Intercompany transaction		0
Others		0
Book value		69,035	[15]	0
Green Radiation Co., Ltd
Disclosure of associates [line items]
Net assets		₩ 77
Effective percentage of ownership		10%
Share in net assets		₩ 8
Investment differential		3
Intercompany transaction		0
Others		0
Book value	[18]	11
Future Convergence Technology Laboratory. Co., Ltd
Disclosure of associates [line items]
Net assets		₩ 249
Effective percentage of ownership		20.12%
Share in net assets		₩ 50
Investment differential		0
Intercompany transaction		0
Others		0
Book value		50
SC E&G. Co,. Ltd
Disclosure of associates [line items]
Net assets		₩ 1,068
Effective percentage of ownership		20%
Share in net assets		₩ 214
Investment differential		0
Intercompany transaction		0
Others		0
Book value		214		0
Wang San Engineering. Co,. Ltd
Disclosure of associates [line items]
Net assets		₩ 828
Effective percentage of ownership		20%
Share in net assets		₩ 166
Investment differential		0
Intercompany transaction		0
Others		0
Book value		166		0
ACE
Disclosure of associates [line items]
Net assets		₩ 100
Effective percentage of ownership		20%
Share in net assets		₩ 20
Investment differential		0
Intercompany transaction		0
Others		0
Book value		20		0
Environment and Energy Co., Ltd
Disclosure of associates [line items]
Net assets		₩ 93
Effective percentage of ownership		10.54%
Share in net assets		₩ 10
Investment differential		0
Intercompany transaction		0
Others		0
Book value		10	[18]	0
Santiago Solar Power SpA
Disclosure of associates [line items]
Net assets		₩ 26,748
Effective percentage of ownership		50%
Share in net assets		₩ 13,373
Investment differential		0
Intercompany transaction		0
Others		0
Book value		13,373		₩ 0
Yanggu Floating Photovoltaic Power Plant Inc
Disclosure of associates [line items]
Net assets		₩ 3,115
Effective percentage of ownership		29%
Share in net assets		₩ 903
Investment differential		0
Intercompany transaction		0
Others		0
Book value		₩ 903
[1]Due to changes in equity, the nominal and effective percentage of ownership are 20.47%.[2]The Company is planning to sell its investments in YTN Co., Ltd. based on the resolution of the Board of Directors on November 23, 2022, but investments in YTN Co., Ltd. are not classified as assets held-for-sale as the Company hasn’t started the active selling procedures as of December 31, 2022.[3]The effective percentage of ownership is less than 20%. However, the Group can exercise significant influence by virtue of its contractual right to appoint directors to the board of directors of the entity, and by strict decision criteria of the Group’s financial and operating policy of the board of directors.[4]The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint directors to the board of directors of the entity, and by strict decision criteria of the Company’s financial and operating policy of the board of directors.[5]The effective percentage of ownership is 100%. However, the Government regulates the Group’s ability to make operating and financial decisions over the entity, as the Government requires maintaining arms-length transactions between KPX and the Group’s other subsidiaries. Accordingly, the entity is not classified as a consolidated subsidiary. The Group can exercise significant influence by virtue of right to nominate directors to the board of directors of the entity.[6]The effective percentage of ownership is 100%. However, the Government regulates the Company’s ability to make operating and financial decisions over the entity, as the Government requires maintaining arms-length transactions between KPX and the Company’s other subsidiaries. Accordingly, the entity is not classified as a consolidated subsidiary. The Company can exercise significant influence by virtue of right to nominate directors to the board of directors of the entity.[7]After addtional acquisition of the shares, the effective percentage of ownership is more than 50%. However, the Group does not hold control over relevant business while it exercises significant influence by participating in the board of directors by the shareholders’ agreement. Accordingly, the entity is classified as an associate.[8]The Company is planning to sell its investment in SPC Power Corporation, KEPCO SPC Power Corporation, KV Holdings, Inc. and time or proceeds of sales are not specified as of December 31, 2022.[9]The effective percentage of ownership is less than 20%. However, the Group can exercise significant influence by virtue of its contractual right to appoint one out of four members of the steering committee of the entity. Moreover, the Group has significant financial transactions, which can affect its significant influence on the entity.[10]The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint one out of four members of the steering committee of the entity. Moreover, the Company has significant financial transactions, which can affect its significant influence on the entity.[11]Although the nominal percentage of ownership is 2.35%, the effective percentage of ownership is 25.54%, considering redeemable convertible preferred stock as a liability component.[12]The effective percentage of ownership is 34.01% considering the conversion of redeemable convertible preferred stock into ordinary stock.[13]The effective percentage of ownership is more than 50% but the Group does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. Accordingly, the entity is classified as an associate.[14]The effective percentage of ownership is more than 50% but the Company does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. Accordingly, the entity is classified as an associate.[15]The effective percentage of ownership is less than 20%. However, the entity is classified as an associate because the Group excercises significant influence over the decisions related to finance and operation.[16]The effective percentage of ownership is less than 20%. However, the Company considers the major decision-making body to be the general decision of the board of directors, and the general decision of the board of directors can be passed only by two directors of Namjeongsusang Solar Power Operation Co., Ltd. Accordingly, the entity is classified as an associate.[17]According to the shareholders’ agreement, additional investment of 50% of total stake is agreed by March 2022.[18]The effective percentage of ownership is less than 20%. However, the entity is classified as an associate because the Group excercises significant influence over the entity.[19]The percentage of ownership decreased due to the unequal capital increase. The entity was reclassified from a joint venture to an associate, due to the changes in voting rights.[20]The effective percentage of ownership decreased due to the disproportionate paid-in capital increase, and the effective percentage of ownership is less than 20%. However, the Group excercises significant influence over all decisions related to finance and operation.[21]The effective percentage of ownership decreased due to the disproportionate paid-in capital increase during the year ended December 31, 2022. The effective percentage of ownership is more than 50% but the Group does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. Accordingly, the entity is classified as an associate.

Investments in Joint Ventures 1

Investments in Joint Ventures 1 (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Disclosure of joint ventures [line items]
Acquisition cost		₩ 2,332,579		₩ 2,069,491
Total acquisition cost		5,422,262		5,129,326
Book value [Abstract]
Total book value		8,992,048		7,471,384
Book value		₩ 3,147,584		₩ 2,239,011		₩ 1,919,746
KEPCO-Uhde Inc.
Disclosure of joint ventures [line items]
Key operation activities		Power generation	[1]	Power generation	[2]
Location		KOREA	[1]	Korea	[2]
Percentage of ownership		52.80%	[1]	52.80%	[2]
Acquisition cost		₩ 11,355	[1]	₩ 11,355	[2]
Book value [Abstract]
Book value		₩ 17	[1]	₩ 58	[2]	100
Shuweihat Asia Power Investment B.V.
Disclosure of joint ventures [line items]
Key operation activities		Holding company		Holding company
Location		NETHERLANDS		Netherlands
Percentage of ownership		49%		49%
Acquisition cost		₩ 44,405		₩ 44,405
Book value [Abstract]
Book value		₩ 66,452		₩ 37,069		13,264
Shuweihat Asia Operation & Maintenance Company
Disclosure of joint ventures [line items]
Key operation activities		Maintenance of utility plant	[1]	Maintenance of utility plant	[2]
Location		CAYMAN	[1]	Cayman	[2]
Percentage of ownership		55%	[1]	55%	[2]
Acquisition cost		₩ 30	[1]	₩ 30	[2]
Book value [Abstract]
Book value		₩ 1,631	[1]	₩ 1,380	[2]	1,057
Waterbury Lake Uranium L.P.
Disclosure of joint ventures [line items]
Key operation activities		Resources development	[3]	Resources development
Location		CANADA	[3]	Canada
Percentage of ownership		32.59%	[3]	33.10%
Acquisition cost		₩ 26,602	[3]	₩ 26,602
Book value [Abstract]
Book value		₩ 21,750	[3]	₩ 21,590		19,797
ASM-BG Investicii AD
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		BULGARIA		Bulgaria
Percentage of ownership		50%		50%
Acquisition cost		₩ 9,846		₩ 16,101
Book value [Abstract]
Book value		₩ 14,555		₩ 18,692		18,200
RES Technology AD
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		BULGARIA		Bulgaria
Percentage of ownership		50%		50%
Acquisition cost		₩ 11,922		₩ 15,595
Book value [Abstract]
Book value		₩ 15,133		₩ 16,703		15,930
KV Holdings, Inc.
Disclosure of joint ventures [line items]
Key operation activities		Power generation	[4]	Power generation
Location		PHILIPPINES	[4]	Philippines
Percentage of ownership		40%	[4]	40%
Acquisition cost		₩ 2,103	[4]	₩ 2,103
Book value [Abstract]
Book value		₩ 9,659	[4]	₩ 2,527		2,405
KEPCO SPC Power Corporation
Disclosure of joint ventures [line items]
Key operation activities		Construction and operation of utility plant	[1],[4]	Construction and operation of utility plant	[2]
Location		PHILIPPINES	[1],[4]	Philippines	[2]
Percentage of ownership		75.20%	[1],[4]	75.20%	[2]
Acquisition cost		₩ 94,579	[1],[4]	₩ 94,579	[2]
Book value [Abstract]
Book value		₩ 179,594	[1],[4]	₩ 198,979	[2]	201,663
Gansu Datang Yumen Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		CHINA		China
Percentage of ownership		40%		40%
Acquisition cost		₩ 16,621		₩ 16,621
Book value [Abstract]
Book value		₩ 6,024		₩ 6,635		6,530
Datang Chifeng Renewable Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		CHINA		China
Percentage of ownership		40%		40%
Acquisition cost		₩ 121,928		₩ 121,928
Book value [Abstract]
Book value		₩ 191,982		₩ 204,587		188,478
Datang KEPCO Chaoyang Renewable Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		CHINA		China
Percentage of ownership		40%		40%
Acquisition cost		₩ 39,872		₩ 39,872
Book value [Abstract]
Book value		₩ 44,398		₩ 44,217		42,530
Rabigh Electricity Company
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		SAUDI ARABIA		Saudi Arabia
Percentage of ownership		40%		40%
Acquisition cost		₩ 109,743		₩ 109,743
Book value [Abstract]
Book value		₩ 214,607		₩ 143,678		97,157
Rabigh Operation & Maintenance Company Limited
Disclosure of joint ventures [line items]
Key operation activities		Maintenance of utility plant		Maintenance of utility plant
Location		SAUDI ARABIA		Saudi Arabia
Percentage of ownership		40%		40%
Acquisition cost		₩ 70		₩ 70
Book value [Abstract]
Book value		₩ 5,113		₩ 4,071		3,813
Jamaica Public Service Company Limited
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		JAMAICA		Jamaica
Percentage of ownership		40%		40%
Acquisition cost		₩ 301,910		₩ 301,910
Book value [Abstract]
Book value		₩ 331,407		₩ 294,649		266,221
KW Nuclear Components Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities		Manufacturing		Manufacturing
Location		KOREA		Korea
Percentage of ownership		45%		45%
Acquisition cost		₩ 833		₩ 833
Book value [Abstract]
Book value		₩ 17,090		₩ 15,734		11,171
Busan Shinho Solar Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		25%		25%
Acquisition cost		₩ 2,100		₩ 2,100
Book value [Abstract]
Book value		₩ 6,719		₩ 5,841		5,378
Global Trade Of Power System Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	[5]	Exporting products and technology of small or medium business by proxy		Exporting products and technology of small or medium business by proxy
Location	[5]	KOREA		Korea
Percentage of ownership	[5]	29%		29%
Acquisition cost	[5]	₩ 290		₩ 290
Book value [Abstract]
Book value		₩ 698	[5]	₩ 597	[5]	546
Expressway Solar-light Power Generation Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities		Power generation	[6]	Power generation	[5]
Location		KOREA	[6]	Korea	[5]
Percentage of ownership		50%	[6]	29%	[5]
Acquisition cost		₩ 1,856	[6]	₩ 1,856	[5]
Book value [Abstract]
Book value		₩ 4,754	[6]	₩ 3,084	[5]	2,896
Amman Asia Electric Power Company
Disclosure of joint ventures [line items]
Key operation activities		Power generation	[1]	Power generation	[2]
Location		JORDAN	[1]	Jordan	[2]
Percentage of ownership		60%	[1]	60%	[2]
Acquisition cost		₩ 111,476	[1]	₩ 111,476	[2]
Book value [Abstract]
Book value		₩ 220,254	[1]	₩ 178,679	[2]	161,253
KAPES, Inc.
Disclosure of joint ventures [line items]
Key operation activities		R & D	[1]	R & D	[2]
Location		KOREA	[1]	Korea	[2]
Percentage of ownership		51%	[1]	51%	[2]
Acquisition cost		₩ 5,629	[1]	₩ 5,629	[2]
Book value [Abstract]
Book value		₩ 0	[1]	₩ 0	[2]	0
Honam Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		29%		29%
Acquisition cost		₩ 3,480		₩ 3,480
Book value [Abstract]
Book value		₩ 4,819		₩ 4,041		3,887
Korea Power Engineering Service Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities		Construction and service		Construction and service
Location		KOREA		Korea
Percentage of ownership		29%		29%
Acquisition cost		₩ 290		₩ 290
Book value [Abstract]
Book value		₩ 5,543		₩ 5,415		5,362
Chun-cheon Energy Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		29.90%		29.90%
Acquisition cost		₩ 52,700		₩ 52,700
Book value [Abstract]
Book value		₩ 32,044		₩ 25,896		27,518
Yeonggwangbaeksu Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	[5]	Power generation		Power generation
Location	[5]	KOREA		Korea
Percentage of ownership	[5]	15%		15%
Acquisition cost	[5]	₩ 3,000		₩ 3,000
Book value [Abstract]
Book value		₩ 3,151	[5]	₩ 2,728	[5]	3,124
Nghi Son 2 Power LLC
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		VIETNAM		Vietnam
Percentage of ownership		50%		50%
Acquisition cost		₩ 175,261		₩ 2,781
Book value [Abstract]
Book value		₩ 408,839		₩ 0		0
Kelar S.A
Disclosure of joint ventures [line items]
Key operation activities		Power generation	[1]	Power generation	[2]
Location		CHILE	[1]	Chile	[2]
Percentage of ownership		65%	[1]	65%	[2]
Acquisition cost		₩ 78,060	[1]	₩ 78,060	[2]
Book value [Abstract]
Book value		₩ 117,137	[1]	₩ 86,695	[2]	71,449
PT. Tanjung Power Indonesia
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		INDONESIA		Indonesia
Percentage of ownership		35%		35%
Acquisition cost		₩ 57,039		₩ 26,892
Book value [Abstract]
Book value		₩ 92,907		₩ 46,546		33,063
Incheon New Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities		Power generation	[7]	Power generation	[8]
Location		KOREA	[7]	Korea	[8]
Percentage of ownership		29%	[7]	29%	[8]
Acquisition cost		₩ 461	[7]	₩ 461	[8]
Book value [Abstract]
Book value		₩ 198	[7]	₩ 0	[8]	0
Seokmun Energy Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		29%		29%
Acquisition cost		₩ 15,370		₩ 15,370
Book value [Abstract]
Book value		₩ 17,336		₩ 13,842		14,814
Daehan Wind Power PSC
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		JORDAN		Jordan
Percentage of ownership		50%		50%
Acquisition cost		₩ 7,493		₩ 7,493
Book value [Abstract]
Book value		₩ 13,923		₩ 5,154		0
Barakah One Company
Disclosure of joint ventures [line items]
Key operation activities	[9]	Power generation		Power generation
Location	[9]	UAE		UAE
Percentage of ownership	[9]	18%		18%
Acquisition cost	[9]	₩ 118		₩ 118
Book value [Abstract]
Book value		₩ 0	[9]	₩ 0	[9]	0
Nawah Energy Company
Disclosure of joint ventures [line items]
Key operation activities	[9]	Operation of utility plant		Operation of utility plant
Location	[9]	UAE		UAE
Percentage of ownership	[9]	18%		18%
Acquisition cost	[9]	₩ 296		₩ 296
Book value [Abstract]
Book value		₩ 315	[9]	₩ 294	[9]	270
Momentum
Disclosure of joint ventures [line items]
Key operation activities		International thermonuclear experimental reactor construction management		International thermonuclear experimental reactor construction management
Location		FRANCE		France
Percentage of ownership		33.33%		33.33%
Acquisition cost		₩ 1		₩ 1
Book value [Abstract]
Book value		₩ 345		₩ 368		565
Daegu Green Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	[10]	Power generation		Power generation
Location	[10]	KOREA		Korea
Percentage of ownership	[10]	29%		29%
Acquisition cost	[10]	₩ 46,225		₩ 46,225
Book value [Abstract]
Book value		₩ 29,360	[10]	₩ 24,054	[10]	23,045
Yeonggwang Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		46%		46%
Acquisition cost		₩ 17,475		₩ 17,475
Book value [Abstract]
Book value		₩ 20,713		₩ 17,646		17,256
Chester Solar IV SpA
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		CHILE		Chile
Percentage of ownership		45%		45%
Acquisition cost		₩ 1,700		₩ 1,700
Book value [Abstract]
Book value		₩ 181		₩ 0		1,064
Chester Solar V SpA
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		CHILE		Chile
Percentage of ownership		45%		45%
Acquisition cost		₩ 525		₩ 525
Book value [Abstract]
Book value		₩ 156		₩ 25		277
Diego de Almagro Solar SpA
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		CHILE		Chile
Percentage of ownership		45%		45%
Acquisition cost		₩ 2,091		₩ 2,091
Book value [Abstract]
Book value		₩ 540		₩ 362		1,490
South Jamaica Power Company Limited
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		JAMAICA		Jamaica
Percentage of ownership		20%		20%
Acquisition cost		₩ 20,430		₩ 20,430
Book value [Abstract]
Book value		₩ 46,437		₩ 37,360		31,897
Daesan Green Energy Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		35%		35%
Acquisition cost		₩ 17,850		₩ 17,850
Book value [Abstract]
Book value		₩ 19,218		₩ 21,244		22,552
RE Holiday Holdings LLC
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		USA		USA
Percentage of ownership		50%		50%
Acquisition cost		₩ 42,948		₩ 42,948
Book value [Abstract]
Book value		₩ 85,370		₩ 73,167		68,809
RE Pioneer Holdings LLC
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		USA		USA
Percentage of ownership		50%		50%
Acquisition cost		₩ 27,891		₩ 27,891
Book value [Abstract]
Book value		₩ 55,172		₩ 47,015		49,639
RE Barren Ridge 1 Holdings LLC
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		USA		USA
Percentage of ownership		50%		50%
Acquisition cost		₩ 28,021		₩ 28,021
Book value [Abstract]
Book value		₩ 3,350		₩ 1,883		4,466
RE Astoria 2 LandCo LLC
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		USA		USA
Percentage of ownership		50%		50%
Acquisition cost		₩ 5,188		₩ 5,188
Book value [Abstract]
Book value		₩ 6,599		₩ 5,998		5,230
RE Barren Ridge LandCo LLC
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		USA		USA
Percentage of ownership		50%		50%
Acquisition cost		₩ 2,187		₩ 2,187
Book value [Abstract]
Book value		₩ 2,333		₩ 2,120		1,847
Laurel SpA
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		CHILE		Chile
Percentage of ownership		45%		45%
Acquisition cost		₩ 1,222		₩ 1,222
Book value [Abstract]
Book value		₩ 554		₩ 290		1,092
KIAMCO KOWEPO Bannerton Hold Co Pty Ltd
Disclosure of joint ventures [line items]
Key operation activities	[5]	Power generation		Power generation
Location	[5]	AUSTRALIA		Australia
Percentage of ownership	[5]	12.37%		12.37%
Acquisition cost	[5]	₩ 4,095		₩ 4,095
Book value [Abstract]
Book value		₩ 3,651	[5]	₩ 3,625	[5]	4,129
Chile Solar JV SpA
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		CHILE		Chile
Percentage of ownership		50%		50%
Acquisition cost		₩ 12,674		₩ 37,689
Book value [Abstract]
Book value		₩ 9,819		₩ 32,457		34,883
Cheong-Song Noraesan Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities		Power generation	[3]	Power generation
Location		KOREA	[3]	Korea
Percentage of ownership		29.01%	[3]	29.01%
Acquisition cost		₩ 3,200	[3]	₩ 3,200
Book value [Abstract]
Book value		₩ 4,263	[3]	₩ 4,106		3,453
Chester Solar I SpA
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		CHILE		Chile
Percentage of ownership		45%		45%
Acquisition cost		₩ 1,181		₩ 1,181
Book value [Abstract]
Book value		₩ 1,314		₩ 1,120		1,621
Solar Philippines Calatagan Corporation
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		PHILIPPINES		Philippines
Percentage of ownership		38%		38%
Acquisition cost		₩ 47,903		₩ 47,903
Book value [Abstract]
Book value		₩ 56,902		₩ 58,231		49,017
Saemangeum Solar Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	[11]	Power generation		Power generation
Location	[11]	KOREA		Korea
Percentage of ownership	[11]	81.01%		81.01%
Acquisition cost	[11]	₩ 26,400		₩ 26,400
Book value [Abstract]
Book value		₩ 23,551	[11]	₩ 23,939	[11]	24,292
Chungsongmeon BongSan wind power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	[5]	Power generation		Power generation
Location	[5]	KOREA		Korea
Percentage of ownership	[5]	29%		29%
Acquisition cost	[5]	₩ 2,900		₩ 2,900
Book value [Abstract]
Book value		₩ 3,470	[5]	₩ 3,808	[5]	4,124
Jaeun Resident Wind Power Plant Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities		Power generation	[5]	Power generation
Location		KOREA	[5]	Korea
Percentage of ownership		29%	[5]	29%
Acquisition cost		₩ 2,494	[5]	₩ 2,494
Book value [Abstract]
Book value		₩ 2,236	[5]	₩ 1,958		2,195
DE Energia SpA
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		CHILE		Chile
Percentage of ownership		49%		49%
Acquisition cost		₩ 8,364		₩ 8,364
Book value [Abstract]
Book value		₩ 9,536		₩ 8,921		8,187
Dangjin Eco Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities				Power generation
Location				Korea
Percentage of ownership				34%
Acquisition cost				₩ 25,661
Book value [Abstract]
Book value				26,109
Dangjin Eco Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership		34%
Acquisition cost		₩ 25,661
Book value [Abstract]
Book value		₩ 26,859		₩ 26,109		25,523
Haemodum Solar Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		49%		49%
Acquisition cost		₩ 2,940		₩ 2,940
Book value [Abstract]
Book value		₩ 3,367		₩ 3,081		3,065
Yangyang Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		50%		50%
Acquisition cost		₩ 12,000		₩ 12,000
Book value [Abstract]
Book value		₩ 10,864		₩ 11,191		10,485
Horus Solar, S.A. De C.V.
Disclosure of joint ventures [line items]
Key operation activities		Renewable power generation	[12]	Renewable power generation	[13]
Location		MEXICO	[12]	Mexico	[13]
Percentage of ownership		14.95%	[12]	14.95%	[13]
Acquisition cost		₩ 5,068	[12]	₩ 5,068	[13]
Book value [Abstract]
Book value		₩ 6,976	[12]	₩ 5,842	[13]	3,394
Recursos Solares PV De Mexico II, S.A. De C.V.
Disclosure of joint ventures [line items]
Key operation activities		Renewable power generation	[12]	Renewable power generation	[13]
Location		MEXICO	[12]	Mexico	[13]
Percentage of ownership		14.95%	[12]	14.95%	[13]
Acquisition cost		₩ 3,678	[12]	₩ 3,678	[13]
Book value [Abstract]
Book value		₩ 4,899	[12]	₩ 4,536	[13]	3,660
Sunmex Renovables, S.A. De C.V.
Disclosure of joint ventures [line items]
Key operation activities		Renewable power generation	[12]	Renewable power generation	[13]
Location		MEXICO	[12]	Mexico	[13]
Percentage of ownership		14.95%	[12]	14.95%	[13]
Acquisition cost		₩ 1,678	[12]	₩ 1,678	[13]
Book value [Abstract]
Book value		₩ 1,657	[12]	₩ 1,610	[13]	240
Stavro Holding II A.B.
Disclosure of joint ventures [line items]
Key operation activities		Holding company		Holding company
Location		SWEDEN		Sweden
Percentage of ownership		20%		20%
Acquisition cost		₩ 18,566		₩ 17,615
Book value [Abstract]
Book value		₩ 17,171		₩ 17,627		9,277
Solaseado Solar Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		39%		38.90%
Acquisition cost		₩ 7,020		₩ 7,020
Book value [Abstract]
Book value		₩ 16,233		₩ 9,891		9,915
Yeongam Solar Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	[5]	Power generation		Power generation
Location	[5]	KOREA		Korea
Percentage of ownership	[5]	19%		19%
Acquisition cost	[5]	₩ 6,460		₩ 6,460
Book value [Abstract]
Book value		₩ 9,879	[5]	₩ 6,838	[5]	6,042
Samsu Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	[5]	Power generation		Power generation
Location	[5]	KOREA		Korea
Percentage of ownership	[5]	19%		19%
Acquisition cost	[5]	₩ 2,637		₩ 2,637
Book value [Abstract]
Book value		₩ 3,205	[5]	₩ 2,828	[5]	2,607
Pulau Indah Power Plant Sdn. Bhd.
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		MALAYSIA		Malaysia
Percentage of ownership		25%		25%
Acquisition cost		₩ 23,833		₩ 23,833
Book value [Abstract]
Book value		26,814		₩ 22,099		11,204
Sam-Yang Photovoltaic Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities				Power generation
Location				Korea
Percentage of ownership				49%
Acquisition cost				₩ 5,245
Book value [Abstract]
Book value		₩ 0		₩ 4,993		5,535
NH-Amundi Global Infrastructure Investment Private Investment Trust 21
Disclosure of joint ventures [line items]
Key operation activities		Holding company	[11]	Holding company
Location		KOREA	[11]	Korea
Percentage of ownership		29.53%	[11]	29.53%
Acquisition cost		₩ 20,061	[11]	₩ 19,983
Book value [Abstract]
Book value		₩ 21,723	[11]	₩ 21,456		22,242
Shin-han BNPP Private Investment Trust for East-West Sunlight Dream
Disclosure of joint ventures [line items]
Key operation activities		Holding company	[1]	Holding company	[2]
Location		KOREA	[1]	Korea	[2]
Percentage of ownership		90%	[1]	90%	[2]
Acquisition cost		₩ 15,012	[1]	₩ 15,699	[2]
Book value [Abstract]
Book value		₩ 15,587	[1]	₩ 16,288	[2]	16,129
PT Barito Wahana Tenaga
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		INDONESIA		Indonesia
Percentage of ownership		30.61%		30.61%
Acquisition cost		₩ 59,574		₩ 59,535
Book value [Abstract]
Book value		₩ 137,047		₩ 81,595		63,029
Cheongna Energy Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	[11]	Generating and distributing vapor and hot/cold water		Generating and distributing vapor and hot/cold water
Location	[11]	KOREA		Korea
Percentage of ownership	[11]	50.10%		50.10%
Acquisition cost	[11]	₩ 49,344		₩ 49,344
Book value [Abstract]
Book value		₩ 10,758	[11]	₩ 11,198	[11]	4,940
Naepo Green Energy Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		29.20%		29.20%
Acquisition cost		₩ 29,200		₩ 29,200
Book value [Abstract]
Book value		₩ 0		₩ 0		0
Dayone Energy Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities		Power generation	[14]	Power generation	[15]
Location		KOREA	[14]	Korea	[15]
Percentage of ownership		30.66%	[14]	30.66%	[15]
Acquisition cost		₩ 71,070	[14]	₩ 71,070	[15]
Book value [Abstract]
Book value		₩ 0	[14]	₩ 0	[15]	0
OneEnergy Asia Limited
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		VIETNAM		Vietnam
Percentage of ownership		40%		40%
Acquisition cost		₩ 115,949		₩ 76,916
Book value [Abstract]
Book value		₩ 172,218		₩ 79,700		56,654
KAS Investment I LLC
Disclosure of joint ventures [line items]
Key operation activities		Holding company	[3]	Holding company
Location		USA	[3]	USA
Percentage of ownership		29.89%	[3]	29.89%
Acquisition cost		₩ 23,437	[3]	₩ 23,437
Book value [Abstract]
Book value		₩ 18,247	[3]	₩ 15,273		23,437
KAS Investment II LLC
Disclosure of joint ventures [line items]
Key operation activities		Holding company	[3]	Holding company
Location		USA	[3]	USA
Percentage of ownership		29.89%	[3]	29.89%
Acquisition cost		₩ 23,343	[3]	₩ 23,343
Book value [Abstract]
Book value		₩ 18,173	[3]	₩ 15,213		23,343
Energyco Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		29%		29%
Acquisition cost		₩ 1,659		₩ 1,659
Book value [Abstract]
Book value		₩ 2,190		₩ 1,535
CAES, LLC
Disclosure of joint ventures [line items]
Key operation activities		Holding company		Holding company
Location		USA		USA
Percentage of ownership		36%		36%
Acquisition cost		₩ 19,414		₩ 19,414
Book value [Abstract]
Book value		₩ 20,805		₩ 18,435		17,626
Hapcheon Floating Photovoltaic Power Plant Inc.
Disclosure of joint ventures [line items]
Key operation activities	[5]	Power generation		Power generation
Location	[5]	KOREA		Korea
Percentage of ownership	[5]	49%		49%
Acquisition cost	[5]	₩ 7,512		₩ 7,512
Book value [Abstract]
Book value		₩ 8,471	[5]	₩ 6,971	[5]	1,890
Busan Industrial Solar Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		28.02%		28.02%
Acquisition cost		₩ 510		₩ 510
Book value [Abstract]
Book value		₩ 1,168		₩ 612		510
Bitsolar Energy Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		27.10%		27.10%
Acquisition cost		₩ 352		₩ 352
Book value [Abstract]
Book value		₩ 352		₩ 352		352
Pulau Indah O&M Sdn. Bhd.
Disclosure of joint ventures [line items]
Key operation activities	[11]	Power generation		Power generation
Location	[11]	MALAYSIA		Malaysia
Percentage of ownership	[11]	60%		60%
Acquisition cost	[11]	₩ 0		₩ 0
Book value [Abstract]
Book value	[11]	₩ 0		₩ 0
Guadalupe Solar SpA
Disclosure of joint ventures [line items]
Key operation activities	[11]	Power generation		Power generation
Location	[11]	CHILE		Chile
Percentage of ownership	[11]	60%		60%
Acquisition cost	[11]	₩ 1,397		₩ 1,397
Book value [Abstract]
Book value		₩ 913	[11]	₩ 659	[11]	0
Omisan Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		42%		42%
Acquisition cost		₩ 10,752		₩ 10,752
Book value [Abstract]
Book value		₩ 10,411		₩ 10,633		0
Foresight Iberian Solar Group Holding, S.L
Disclosure of joint ventures [line items]
Key operation activities	[11]	Power generation		Power generation
Location	[11]	SPAIN		Spain
Percentage of ownership	[11]	75%		75%
Acquisition cost	[11]	₩ 11,465		₩ 9,697
Book value [Abstract]
Book value	[11]	₩ 10,565		₩ 9,743
Yeongwol Eco Wind Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		29%		29%
Acquisition cost		₩ 3,089		₩ 3,089
Book value [Abstract]
Book value		₩ 3,155		₩ 3,196		0
Gurae Resident Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		29%		29%
Acquisition cost		₩ 386		₩ 386
Book value [Abstract]
Book value		₩ 391		₩ 395		0
Cheongju Eco Park Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		29%		29%
Acquisition cost		₩ 5,858		₩ 5,858
Book value [Abstract]
Book value		₩ 10,490		₩ 5,465		0
Enel X Midland Photovoltaic, LLC
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		20%		20%
Acquisition cost		₩ 1,695		₩ 1,695
Book value [Abstract]
Book value		₩ 1,856		₩ 1,688		0
Geumsungsan Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		29%		29%
Acquisition cost		₩ 6,531		₩ 6,531
Book value [Abstract]
Book value		₩ 3,493		₩ 6,053		0
KEPCO KPS Carabao Corp.
Disclosure of joint ventures [line items]
Key operation activities		Utility plant maintenance	[7]	Utility plant maintenance
Location		PHILIPPINES	[7]	Philippines
Percentage of ownership		40%	[7]	40%
Acquisition cost		₩ 93	[7]	₩ 93
Book value [Abstract]
Book value		₩ 177	[7]	₩ 386		0
Prime Swedish Holding AB
Disclosure of joint ventures [line items]
Key operation activities		Holding company		Holding company
Location		SWEDEN		Sweden
Percentage of ownership		45%		45%
Acquisition cost		₩ 35,410		₩ 14,514
Book value [Abstract]
Book value		₩ 36,245		₩ 15,441		0
Goheung New Energy Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities		Power generation		Power generation
Location		KOREA		Korea
Percentage of ownership		46.15%		46.15%
Acquisition cost		₩ 12,959		₩ 12,959
Book value [Abstract]
Book value		₩ 11,832		₩ 11,708		0
Gunsan Land Solar Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	[11]	Power generation		Power generation
Location	[11]	KOREA		Korea
Percentage of ownership	[11]	75.29%		75.29%
Acquisition cost	[11]	₩ 19,091		₩ 19,091
Book value [Abstract]
Book value		₩ 27,544	[11]	₩ 19,317	[11]	0
Capman Lynx SCA, SICAR
Disclosure of joint ventures [line items]
Key operation activities		Holding company		Holding company
Location		LUXEMBOURG		Luxembourg
Percentage of ownership		50%		50%
Acquisition cost		₩ 9,601		₩ 9,601
Book value [Abstract]
Book value		₩ 0		₩ 9,976		0
International Offshore Power Transmission Holding Company Limited
Disclosure of joint ventures [line items]
Key operation activities		Undersea transmission network operation		Undersea transmission network operation
Location		UAE		UAE
Percentage of ownership		35%		35%
Acquisition cost		₩ 0		₩ 0
Book value [Abstract]
Book value		₩ 0		0		₩ 0
Pyeongchang Wind Power Co., Ltd
Disclosure of joint ventures [line items]
Key operation activities	[16]	Power generation
Location	[16]	KOREA
Percentage of ownership	[16]	58%
Acquisition cost	[16]	₩ 9,329
Book value [Abstract]
Book value		₩ 14,464	[16]	0
Eumseong Eco Park Co., Ltd
Disclosure of joint ventures [line items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership		29%
Acquisition cost		₩ 5,741
Book value [Abstract]
Book value		₩ 5,557		0
Songsan Green Energy Co., Ltd
Disclosure of joint ventures [line items]
Key operation activities	[3]	Fuel cell generation
Location	[3]	KOREA
Percentage of ownership	[3]	25%
Acquisition cost	[3]	₩ 1,400
Book value [Abstract]
Book value		₩ 1,387	[3]	0
Changwon Nu-ri Energy Co., Ltd
Disclosure of joint ventures [line items]
Key operation activities	[3]	Fuel cell generation
Location	[3]	KOREA
Percentage of ownership	[3]	33.33%
Acquisition cost	[3]	₩ 500
Book value [Abstract]
Book value		₩ 497	[3]	0
Hasami Wind Farm Corporation
Disclosure of joint ventures [line items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership		29%
Acquisition cost		₩ 1,596
Book value [Abstract]
Book value		₩ 1,589		0
PungBack Wind Farm Corporation
Disclosure of joint ventures [line items]
Key operation activities	[17]	Power generation
Location	[17]	KOREA
Percentage of ownership	[17]	32.89%
Acquisition cost	[17]	₩ 7,885
Book value [Abstract]
Book value		₩ 6,743	[17]	0
Trumbull Asset Management, LLC
Disclosure of joint ventures [line items]
Key operation activities	[18]	Holding company
Location	[18]	USA
Percentage of ownership	[18]	78%
Acquisition cost	[18]	₩ 0
Book value [Abstract]
Book value		₩ 246	[18]	0
S-Power Chile SpA
Disclosure of joint ventures [line items]
Key operation activities		Power generation
Location		CHILE
Percentage of ownership		50%
Acquisition cost		₩ 127
Book value [Abstract]
Book value		₩ 127		0
Seungmun Green Energy
Disclosure of joint ventures [line items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership		33%
Acquisition cost		₩ 8,973
Book value [Abstract]
Book value		₩ 9,054		0
Seobusambo highway photovoltaics Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	[19]	Power generation
Location	[19]	KOREA
Percentage of ownership	[19]	80%
Acquisition cost	[19]	₩ 3,020
Book value [Abstract]
Book value		₩ 3,066	[19]	₩ 0
[1]The effective percentage of ownership is more than 50%. However, according to the shareholders’ agreement, all critical financial and operating decisions must be agreed to by all ownership parties and the Group can exercise same voting rights as other shareholders at the board of directors. Accordingly, the entities are classified as joint ventures.[2]The effective percentage of ownership is more than 50%. However, according to the shareholders’ agreement, all critical financial and operating decisions must be agreed to by all ownership parties. Accordingly, the entities are classified as joint ventures.[3]The effective percentage of ownership is less than 50%. However, the entity is classified as a joint venture, because all consent was required to make decisions on related activities.[4]The Company is planning to sell its investment in SPC Power Corporation, KEPCO SPC Power Corporation, KV Holdings, Inc. and time or proceeds of sales are not specified as of December 31, 2022.[5]According to the shareholders’ agreement, the parties have joint control over all decisions related to finance and operation. Accordingly, the entity is classified as joint ventures.[6]The effective percentage of ownership increased due to the disproportionate capital reduction of financial investors during the year ended December 31, 2022.[7]The joint arrangement which the Group has joint control is structured through a separate company. The parties have joint control over the joint arrangement are classified as joint ventures, judging that they have rights to the net assets of the arrangement.[8]The joint arrangement which the Company has joint control is structured through a separate company. The parties have joint control over the joint arrangement are classified as joint ventures, judging that they have rights to the net assets of the arrangement.[9]The effective percentage of ownership is less than 20%. However, decisions in relevant actitvities must be agreed by ownership parties. Accordingly, the entity is classified as joint ventures.[10]Although the nominal percentage of ownership is 29%, the effective percentage of ownership is 54.24%, considering the interest of financial investors as a liability component.[11]The effective percentage of ownership is more than 50%. However, decisions in relevant actitvities must be agreed by all ownership parties. Accordingly, the entity is classified as a joint venture.[12]The effective percentage of ownership is less than 20%. However, according to the shareholders’ agreement, decisions related pricipal operation must be agreed by all ownership parties. Accordingly, the Group can exercise significant influence.[13]The effective percentage of ownership is less than 20%. However, according to the shareholders’ agreement, decisions related pricipal operation must be agreed by all ownership parties. Accordingly, the Company can exercise significant influence.[14]According to the Dayone Energy Co., Ltd. Investment Agreement signed in March 2011, the Group has a commitment to guarantee principal and certain returns on shares of Dayone Energy Co., Ltd. held by NH Power 2nd Co., Ltd. and the National Agricultural Cooperative Federation. Since NH Power 2nd Co., Ltd. and the National Agricultural Cooperative Federation have put option regarding their share of the entity, the Group was deemed to have acquired an additional 15.64% stake. As a result, the effective percentage of ownership is 46.3% in the current and prior period. In accordance with shareholders’ agreement signed during the current period, the Group has joint control with other investors in making important financial and operation decisions, so it has been reclassified from an associate to a joint venture.[15]According to the Dayone Energy Co., Ltd. Investment Agreement signed in March 2011, the Company has a commitment to guarantee principal and certain returns on shares of Dayone Energy Co., Ltd. held by NH Power 2nd Co., Ltd. and the National Agricultural Cooperative Federation. Since NH Power 2nd Co., Ltd. and the National Agricultural Cooperative Federation have put option regarding their share of the entity, the Company was deemed to have acquired an additional 15.64% stake. As a result, the effective percentage of ownership is 46.3% in the current and prior period. In accordance with shareholders’ agreement signed during the current period, the Company has joint control with other investors in making important financial and operation decisions, so it has been reclassified from an associate to a joint venture.[16]After addtional acquisition of the shares, the effective percentage of ownership is more than 50%. However, decisions in relevant actitvities must be agreed by all members of the board of directors. Accordingly, the entity is classified as a joint venture.[17]The effective percentage of ownership is 37%, considering potential common stock.[18]The effective percentage of ownership is more than 50%. However, decisions in relevant actitvities must be agreed by all members of the board of directors. Accordingly, the entity is classified as a joint venture.[19]Due to the changes in the agreement, the Group lost its control over the entity. Accordingly, the entity is reclassified to a joint venture from a subsidiary. Although the effective percentage of ownership is more than 50%, decisions in relevant actitvities must be agreed by all members of the board of directors.

Investments in Joint Ventures 2

Investments in Joint Ventures 2 (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021
Book value [Abstract]
Beginning balance		₩ 2,239,011		₩ 1,919,746
Acquisition		292,033		134,959
Disposal		(35,915)		(11,710)
Dividends received		(112,612)		(139,847)
Share of profit (loss)		246,705		139,933
Other comprehensive income (loss)		507,544		190,305
Others		10,818		5,625
Ending balance		3,147,584		2,239,011
Beginning balance		7,471,384		6,170,533
Acquisition		387,070		703,612
Disposal		(67,313)		(15,194)
Dividends received		(711,940)		(288,242)
Share of profit (loss)		1,338,293		557,056
Other comprehensive income (loss)		552,812		352,056
Others		21,742		(8,437)
Ending balance		8,992,048		7,471,384
KEPCO-Uhde Inc.
Book value [Abstract]
Beginning balance		58	[1]	100
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(43)		(42)
Other comprehensive income (loss)		0		0
Others		2		0
Ending balance		17	[2]	58	[1]
Shuweihat Asia Power Investment B.V.
Book value [Abstract]
Beginning balance		37,069		13,264
Acquisition		0		0
Disposal		0		0
Dividends received		(3,545)		(2,467)
Share of profit (loss)		(1,303)		4,564
Other comprehensive income (loss)		34,231		21,708
Others		0		0
Ending balance		66,452		37,069
Shuweihat Asia Operation & Maintenance Company
Book value [Abstract]
Beginning balance		1,380	[1]	1,057
Acquisition		0		0
Disposal		0		0
Dividends received		(995)		(881)
Share of profit (loss)		1,154		1,101
Other comprehensive income (loss)		92		103
Others		0		0
Ending balance		1,631	[2]	1,380	[1]
Waterbury Lake Uranium L.P.
Book value [Abstract]
Beginning balance		21,590		19,797
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		1		0
Other comprehensive income (loss)		159		1,793
Others		0		0
Ending balance		21,750	[3]	21,590
ASM-BG Investicii AD
Book value [Abstract]
Beginning balance		18,692		18,200
Acquisition		0		0
Disposal		(6,255)		0
Dividends received		(2,395)		(2,703)
Share of profit (loss)		2,979		2,700
Other comprehensive income (loss)		1,534		495
Others		0		0
Ending balance		14,555		18,692
RES Technology AD
Book value [Abstract]
Beginning balance		16,703		15,930
Acquisition		0		0
Disposal		(3,673)		0
Dividends received		(333)		(676)
Share of profit (loss)		1,427		1,116
Other comprehensive income (loss)		1,009		333
Others		0		0
Ending balance		15,133		16,703
KV Holdings, Inc.
Book value [Abstract]
Beginning balance		2,527		2,405
Acquisition		0		0
Disposal		0		0
Dividends received		(394)		(901)
Share of profit (loss)		7,747		962
Other comprehensive income (loss)		(221)		61
Others		0		0
Ending balance		9,659	[4]	2,527
KEPCO SPC Power Corporation
Book value [Abstract]
Beginning balance		198,979	[1]	201,663
Acquisition		0		0
Disposal		0		0
Dividends received		(34,280)		(35,763)
Share of profit (loss)		27,591		37,073
Other comprehensive income (loss)		(12,696)		(3,994)
Others		0		0
Ending balance		179,594	[2],[4]	198,979	[1]
Gansu Datang Yumen Wind Power Co., Ltd.
Book value [Abstract]
Beginning balance		6,635		6,530
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(464)		(619)
Other comprehensive income (loss)		(147)		724
Others		0		0
Ending balance		6,024		6,635
Datang Chifeng Renewable Power Co., Ltd.
Book value [Abstract]
Beginning balance		204,587		188,478
Acquisition		0		0
Disposal		0		0
Dividends received		(8,732)		(14,191)
Share of profit (loss)		2,849		9,342
Other comprehensive income (loss)		(6,722)		20,958
Others		0		0
Ending balance		191,982		204,587
Datang KEPCO Chaoyang Renewable Power Co., Ltd.
Book value [Abstract]
Beginning balance		44,217		42,530
Acquisition		0		0
Disposal		0		0
Dividends received		(2,694)		(2,884)
Share of profit (loss)		3,936		1,562
Other comprehensive income (loss)		(1,061)		3,009
Others		0		0
Ending balance		44,398		44,217
Rabigh Electricity Company
Book value [Abstract]
Beginning balance		143,678		97,157
Acquisition		0		0
Disposal		0		0
Dividends received		(11,447)		(7,221)
Share of profit (loss)		31,523		17,896
Other comprehensive income (loss)		50,853		35,846
Others		0		0
Ending balance		214,607		143,678
Rabigh Operation & Maintenance Company Limited
Book value [Abstract]
Beginning balance		4,071		3,813
Acquisition		0		0
Disposal		0		0
Dividends received		(2,735)		(4,085)
Share of profit (loss)		3,866		3,489
Other comprehensive income (loss)		(89)		854
Others		0		0
Ending balance		5,113		4,071
Jamaica Public Service Company Limited
Book value [Abstract]
Beginning balance		294,649		266,221
Acquisition		0		0
Disposal		0		0
Dividends received		(7,752)		(4,578)
Share of profit (loss)		28,541		12,963
Other comprehensive income (loss)		19,494		23,820
Others		(3,525)		(3,777)
Ending balance		331,407		294,649
KW Nuclear Components Co., Ltd.
Book value [Abstract]
Beginning balance		15,734		11,171
Acquisition		0		0
Disposal		0		0
Dividends received		(833)		(833)
Share of profit (loss)		2,189		5,396
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		17,090		15,734
Busan Shinho Solar Power Co., Ltd.
Book value [Abstract]
Beginning balance		5,841		5,378
Acquisition		0		0
Disposal		0		0
Dividends received		(478)		(352)
Share of profit (loss)		1,356		815
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		6,719		5,841
Global Trade Of Power System Co., Ltd.
Book value [Abstract]
Beginning balance		597	[5]	546
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		101		51
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance	[5]	698		597
Expressway Solar-light Power Generation Co., Ltd.
Book value [Abstract]
Beginning balance		3,084	[5]	2,896
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		1,670		188
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		4,754	[6]	3,084	[5]
Amman Asia Electric Power Company
Book value [Abstract]
Beginning balance		178,679	[1]	161,253
Acquisition		0		0
Disposal		0		0
Dividends received		(19,350)		(27,428)
Share of profit (loss)		23,442		18,487
Other comprehensive income (loss)		37,483		26,367
Others		0		0
Ending balance		220,254	[2]	178,679	[1]
KAPES, Inc.
Book value [Abstract]
Beginning balance		0	[1]	0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		0		0
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		0	[2]	0	[1]
Honam Wind Power Co., Ltd.
Book value [Abstract]
Beginning balance		4,041		3,887
Acquisition		0		0
Disposal		0		0
Dividends received		(174)		0
Share of profit (loss)		952		154
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		4,819		4,041
Jeongam Wind Power Co., Ltd.
Book value [Abstract]
Beginning balance		0		4,620
Acquisition				5,808
Disposal				(10,741)
Dividends received				0
Share of profit (loss)				313
Other comprehensive income (loss)				0
Others				0
Ending balance				0
Korea Power Engineering Service Co., Ltd.
Book value [Abstract]
Beginning balance		5,415		5,362
Acquisition		0		0
Disposal		0		0
Dividends received		(86)		0
Share of profit (loss)		145		206
Other comprehensive income (loss)		0		0
Others		69		(153)
Ending balance		5,543		5,415
Chun-cheon Energy Co., Ltd.
Book value [Abstract]
Beginning balance		25,896		27,518
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		6,148		(1,622)
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		32,044		25,896
Yeonggwangbaeksu Wind Power Co., Ltd.
Book value [Abstract]
Beginning balance		2,728	[5]	3,124
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		423		(396)
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance	[5]	3,151		2,728
Nghi Son 2 Power LLC
Book value [Abstract]
Beginning balance		0		0
Acquisition		172,480		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		51,218		0
Other comprehensive income (loss)		185,141		0
Others		0		0
Ending balance		408,839		0
Kelar S.A
Book value [Abstract]
Beginning balance		86,695	[1]	71,449
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		3,695		2,121
Other comprehensive income (loss)		21,241		6,416
Others		5,506		6,709
Ending balance		117,137	[2]	86,695	[1]
PT. Tanjung Power Indonesia
Book value [Abstract]
Beginning balance		46,546		33,063
Acquisition		30,147		0
Disposal		0		0
Dividends received		(6,104)		0
Share of profit (loss)		4,645		5,027
Other comprehensive income (loss)		18,323		9,029
Others		(650)		(573)
Ending balance		92,907		46,546
Incheon New Power Co., Ltd.
Book value [Abstract]
Beginning balance		0	[7]	0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		198		0
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		198	[8]	0	[7]
Seokmun Energy Co., Ltd.
Book value [Abstract]
Beginning balance		13,842		14,814
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		3,494		(972)
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		17,336		13,842
Daehan Wind Power PSC
Book value [Abstract]
Beginning balance		5,154		0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		2,446		3,791
Other comprehensive income (loss)		6,323		1,363
Others		0		0
Ending balance		13,923		5,154
Barakah One Company
Book value [Abstract]
Beginning balance		0	[9]	0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		0		0
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance	[9]	0		0
Nawah Energy Company
Book value [Abstract]
Beginning balance		294	[9]	270
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		1		0
Other comprehensive income (loss)		20		24
Others		0		0
Ending balance	[9]	315		294
Momentum
Book value [Abstract]
Beginning balance		368		565
Acquisition		0		0
Disposal		0		0
Dividends received		(369)		(569)
Share of profit (loss)		345		368
Other comprehensive income (loss)		1		4
Others		0		0
Ending balance		345		368
Daegu Green Power Co., Ltd.
Book value [Abstract]
Beginning balance		24,054	[10]	23,045
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		5,079		982
Other comprehensive income (loss)		0		0
Others		227		27
Ending balance	[10]	29,360		24,054
Yeonggwang Wind Power Co., Ltd.
Book value [Abstract]
Beginning balance		17,646		17,256
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		3,067		390
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		20,713		17,646
Chester Solar IV SpA
Book value [Abstract]
Beginning balance		0		1,064
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		202		(1,083)
Other comprehensive income (loss)		(17)		(36)
Others		(4)		55
Ending balance		181		0
Chester Solar V SpA
Book value [Abstract]
Beginning balance		25		277
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		129		(269)
Other comprehensive income (loss)		3		2
Others		(1)		15
Ending balance		156		25
Diego de Almagro Solar SpA
Book value [Abstract]
Beginning balance		362		1,490
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		154		(1,095)
Other comprehensive income (loss)		2		(123)
Others		22		90
Ending balance		540		362
South Jamaica Power Company Limited
Book value [Abstract]
Beginning balance		37,360		31,897
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		6,625		2,515
Other comprehensive income (loss)		2,452		2,949
Others		0		(1)
Ending balance		46,437		37,360
Daesan Green Energy Co., Ltd.
Book value [Abstract]
Beginning balance		21,244		22,552
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(2,030)		(1,308)
Other comprehensive income (loss)		0		0
Others		4		0
Ending balance		19,218		21,244
RE Holiday Holdings LLC
Book value [Abstract]
Beginning balance		73,167		68,809
Acquisition		0		0
Disposal		0		0
Dividends received		(2,288)		(9,577)
Share of profit (loss)		2,526		6,299
Other comprehensive income (loss)		11,965		7,636
Others		0		0
Ending balance		85,370		73,167
RE Pioneer Holdings LLC
Book value [Abstract]
Beginning balance		47,015		49,639
Acquisition		0		0
Disposal		0		0
Dividends received		(1,337)		(14,199)
Share of profit (loss)		(275)		5,556
Other comprehensive income (loss)		9,769		6,019
Others		0		0
Ending balance		55,172		47,015
RE Barren Ridge 1 Holdings LLC
Book value [Abstract]
Beginning balance		1,883		4,466
Acquisition		0		0
Disposal		0		0
Dividends received		(1,625)		(1,365)
Share of profit (loss)		(2,886)		(3,162)
Other comprehensive income (loss)		5,978		1,944
Others		0		0
Ending balance		3,350		1,883
RE Astoria 2 LandCo LLC
Book value [Abstract]
Beginning balance		5,998		5,230
Acquisition		0		0
Disposal		0		0
Dividends received		(388)		(337)
Share of profit (loss)		571		619
Other comprehensive income (loss)		418		486
Others		0		0
Ending balance		6,599		5,998
RE Barren Ridge LandCo LLC
Book value [Abstract]
Beginning balance		2,120		1,847
Acquisition		0		0
Disposal		0		0
Dividends received		(160)		(140)
Share of profit (loss)		225		240
Other comprehensive income (loss)		148		173
Others		0		0
Ending balance		2,333		2,120
Laurel SpA
Book value [Abstract]
Beginning balance		290		1,092
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		245		(798)
Other comprehensive income (loss)		3		(71)
Others		16		67
Ending balance		554		290
KIAMCO KOWEPO Bannerton Hold Co Pty Ltd
Book value [Abstract]
Beginning balance		3,625	[5]	4,129
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		26		(111)
Other comprehensive income (loss)		0		(393)
Others		0		0
Ending balance	[5]	3,651		3,625
Chile Solar JV SpA
Book value [Abstract]
Beginning balance		32,457		34,883
Acquisition		0		0
Disposal		(24,894)		0
Dividends received		0		0
Share of profit (loss)		159		831
Other comprehensive income (loss)		2,097		(3,257)
Others		0		0
Ending balance		9,819		32,457
Cheong-Song Noraesan Wind Power Co., Ltd.
Book value [Abstract]
Beginning balance		4,106		3,453
Acquisition		0		0
Disposal		0		0
Dividends received		(672)		0
Share of profit (loss)		832		653
Other comprehensive income (loss)		0		0
Others		(3)		0
Ending balance		4,263	[3]	4,106
Chester Solar I SpA
Book value [Abstract]
Beginning balance		1,120		1,621
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		120		(430)
Other comprehensive income (loss)		(1)		(195)
Others		75		124
Ending balance		1,314		1,120
Solar Philippines Calatagan Corporation
Book value [Abstract]
Beginning balance		58,231		49,017
Acquisition		0		0
Disposal		0		0
Dividends received		(1,710)		(5,961)
Share of profit (loss)		6,081		5,961
Other comprehensive income (loss)		(5,700)		9,214
Others		0		0
Ending balance		56,902		58,231
Saemangeum Solar Power Co., Ltd.
Book value [Abstract]
Beginning balance		23,939	[11]	24,292
Acquisition		0		1
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(388)		(354)
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance	[11]	23,551		23,939
Chungsongmeon BongSan wind power Co., Ltd.
Book value [Abstract]
Beginning balance		3,808	[5]	4,124
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(338)		(316)
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance	[5]	3,470		3,808
Jaeun Resident Wind Power Plant Co., Ltd.
Book value [Abstract]
Beginning balance		1,958		2,195
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		278		(237)
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		2,236	[5]	1,958
DE Energia SpA
Book value [Abstract]
Beginning balance		8,921		8,187
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		0		0
Other comprehensive income (loss)		615		734
Others		0		0
Ending balance		9,536		8,921
Dangjin Eco Power Co., Ltd.
Book value [Abstract]
Beginning balance		26,109		25,523
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		233		274
Other comprehensive income (loss)		513		312
Others		4		0
Ending balance		26,859		26,109
Haemodum Solar Co., Ltd.
Book value [Abstract]
Beginning balance		3,081		3,065
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		286		16
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		3,367		3,081
Yangyang Wind Power Co., Ltd.
Book value [Abstract]
Beginning balance		11,191		10,485
Acquisition		0		1,200
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(327)		(488)
Other comprehensive income (loss)		0		(6)
Others		0		0
Ending balance		10,864		11,191
Horus Solar, S.A. De C.V.
Book value [Abstract]
Beginning balance		5,842	[12]	3,394
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		841		2,396
Other comprehensive income (loss)		293		52
Others		0		0
Ending balance		6,976	[13]	5,842	[12]
Recursos Solares PV De Mexico II, S.A. De C.V.
Book value [Abstract]
Beginning balance		4,536	[12]	3,660
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		68		766
Other comprehensive income (loss)		295		110
Others		0		0
Ending balance		4,899	[13]	4,536	[12]
Sunmex Renovables, S.A. De C.V.
Book value [Abstract]
Beginning balance		1,610	[12]	240
Acquisition		0		1,371
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(151)		(49)
Other comprehensive income (loss)		198		48
Others		0		0
Ending balance		1,657	[13]	1,610	[12]
Stavro Holding II A.B.
Book value [Abstract]
Beginning balance		17,627		9,277
Acquisition		952		8,684
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		157		(55)
Other comprehensive income (loss)		(1,687)		(271)
Others		122		(8)
Ending balance		17,171		17,627
Solaseado Solar Power Co., Ltd.
Book value [Abstract]
Beginning balance		9,891		9,915
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		6,342		(24)
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		16,233		9,891
Yeongam Solar Power Co., Ltd.
Book value [Abstract]
Beginning balance		6,838	[5]	6,042
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		3,041		796
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance	[5]	9,879		6,838
Samsu Wind Power Co., Ltd.
Book value [Abstract]
Beginning balance		2,828	[5]	2,607
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		377		221
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance	[5]	3,205		2,828
Pulau Indah Power Plant Sdn. Bhd.
Book value [Abstract]
Beginning balance		22,099		11,204
Acquisition		0		12,264
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		1,681		(519)
Other comprehensive income (loss)		3,034		(850)
Others		0		0
Ending balance		26,814		22,099
Sam-Yang Photovoltaic Power Co., Ltd.
Book value [Abstract]
Beginning balance		4,993		5,535
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(123)		(542)
Other comprehensive income (loss)		0		0
Others		(4,870)		0
Ending balance		0		4,993
NH-Amundi Global Infrastructure Investment Private Investment Trust 21
Book value [Abstract]
Beginning balance		21,456		22,242
Acquisition		485		0
Disposal		(406)		(969)
Dividends received		(1,415)		(1,727)
Share of profit (loss)		1,603		1,910
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		21,723	[11]	21,456
Shin-han BNPP Private Investment Trust for East-West Sunlight Dream
Book value [Abstract]
Beginning balance		16,288	[1]	16,129
Acquisition		0		0
Disposal		(687)		0
Dividends received		0		0
Share of profit (loss)		(14)		159
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		15,587	[2]	16,288	[1]
PT Barito Wahana Tenaga
Book value [Abstract]
Beginning balance		81,595		63,029
Acquisition		39		140
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		13,352		4,194
Other comprehensive income (loss)		42,061		14,232
Others		0		0
Ending balance		137,047		81,595
Cheongna Energy Co., Ltd.
Book value [Abstract]
Beginning balance		11,198	[11]	4,940
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(440)		6,258
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance	[11]	10,758		11,198
Naepo Green Energy Co., Ltd.
Book value [Abstract]
Beginning balance		0		0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		0		0
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		0		0
Dayone Energy Co., Ltd.
Book value [Abstract]
Beginning balance		0	[14]	0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		0		0
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		0	[15]	0	[14]
OneEnergy Asia Limited
Book value [Abstract]
Beginning balance		79,700		56,654
Acquisition		39,033		20,262
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(18,294)		(1,138)
Other comprehensive income (loss)		71,779		3,922
Others		0		0
Ending balance		172,218		79,700
KAS Investment I LLC
Book value [Abstract]
Beginning balance		15,273		23,437
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		2,426		(6,876)
Other comprehensive income (loss)		548		(1,288)
Others		0		0
Ending balance		18,247	[3]	15,273
KAS Investment II LLC
Book value [Abstract]
Beginning balance		15,213		23,343
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		2,082		(6,515)
Other comprehensive income (loss)		878		(1,615)
Others		0		0
Ending balance		18,173	[3]	15,213
Energyco Co., Ltd. (formerly, Energyco LLC)
Book value [Abstract]
Beginning balance		1,535		1,659
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		655		(60)
Other comprehensive income (loss)		0		(64)
Others		0		0
Ending balance		2,190		1,535
CAES, LLC
Book value [Abstract]
Beginning balance		18,435		17,626
Acquisition		0		0
Disposal		0		0
Dividends received		(217)		(1,009)
Share of profit (loss)		(198)		(331)
Other comprehensive income (loss)		1,756		850
Others		1,029		1,299
Ending balance		20,805		18,435
Hapcheon Floating Photovoltaic Power Plant Inc.
Book value [Abstract]
Beginning balance		6,971	[5]	1,890
Acquisition		0		5,622
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		1,500		(541)
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance	[5]	8,471		6,971
Busan Industrial Solar Power Co., Ltd.
Book value [Abstract]
Beginning balance		612		510
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		556		102
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		1,168		612
Bitsolar Energy Co., Ltd.
Book value [Abstract]
Beginning balance		352		352
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		0		0
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		352		352
Pulau Indah O&M Sdn. Bhd.
Book value [Abstract]
Beginning balance		0		0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		0		0
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		0		0
Guadalupe Solar SpA
Book value [Abstract]
Beginning balance		659	[11]	0
Acquisition		0		1,397
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		221		(672)
Other comprehensive income (loss)		33		(66)
Others		0		0
Ending balance	[11]	913		659
Omisan Wind Power Co., Ltd.
Book value [Abstract]
Beginning balance		10,633		0
Acquisition		0		10,752
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(222)		(119)
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		10,411		10,633
Foresight Iberian Solar Group Holding, S.L.
Book value [Abstract]
Beginning balance		9,743		0
Acquisition		1,781		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(1,016)		72
Other comprehensive income (loss)		3		0
Others		54		9,671
Ending balance		10,565		9,743
Yeongwol Eco Wind Co., Ltd.
Book value [Abstract]
Beginning balance		3,196		0
Acquisition		0		3,089
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(41)		122
Other comprehensive income (loss)		0		(15)
Others		0		0
Ending balance		3,155		3,196
Gurae Resident Power Co., Ltd.
Book value [Abstract]
Beginning balance		395		0
Acquisition		0		386
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(4)		12
Other comprehensive income (loss)		0		(3)
Others		0		0
Ending balance		391		395
Cheongju Eco Park Co., Ltd.
Book value [Abstract]
Beginning balance		5,465		0
Acquisition		0		5,858
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		5,025		(393)
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		10,490		5,465
Enel X Midland Photovoltaic, LLC
Book value [Abstract]
Beginning balance		1,688		0
Acquisition		0		1,695
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		168		(7)
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		1,856		1,688
Geumsungsan Wind Power Co., Ltd.
Book value [Abstract]
Beginning balance		6,053		0
Acquisition		0		6,531
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(2,560)		(478)
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		3,493		6,053
KEPCO KPS Carabao Corp.
Book value [Abstract]
Beginning balance		386		0
Acquisition		0		93
Disposal		0		0
Dividends received		(104)		0
Share of profit (loss)		(105)		293
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		177	[8]	386
Prime Swedish Holding AB
Book value [Abstract]
Beginning balance		15,441		0
Acquisition		20,896		8,155
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(261)		22
Other comprehensive income (loss)		0		1,060
Others		169		6,204
Ending balance		36,245		15,441
Taebaek Gadeoksan Wind Power Co., Ltd.
Book value [Abstract]
Beginning balance		0		13,362
Acquisition				0
Disposal				0
Dividends received				0
Share of profit (loss)				762
Other comprehensive income (loss)				0
Others				(14,124)
Ending balance				0
Goheung New Energy Co., Ltd.
Book value [Abstract]
Beginning balance		11,708		0
Acquisition		0		12,959
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		124		(1,251)
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		11,832		11,708
Gunsan Land Solar Co., Ltd.
Book value [Abstract]
Beginning balance		19,317	[11]	0
Acquisition		0		19,091
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		8,220		324
Other comprehensive income (loss)		7		(98)
Others		0		0
Ending balance	[11]	27,544		19,317
Capman Lynx SCA, SICAR
Book value [Abstract]
Beginning balance		9,976		0
Acquisition		0		9,601
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		(10,195)		375
Other comprehensive income (loss)		5,173		0
Others		(4,954)		0
Ending balance		0		9,976
International Offshore Power Transmission Holding Company Limited
Book value [Abstract]
Beginning balance		0		0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of profit (loss)		0		0
Other comprehensive income (loss)		0		0
Others		0		0
Ending balance		0		0
Pyeongchang Wind Power Co., Ltd
Book value [Abstract]
Beginning balance		0
Acquisition		0
Disposal		0
Dividends received		0
Share of profit (loss)		0
Other comprehensive income (loss)		0
Others		14,464
Ending balance		14,464	[16]	0
Eumseong Eco Park Co., Ltd
Book value [Abstract]
Beginning balance		0
Acquisition		5,741
Disposal		0
Dividends received		0
Share of profit (loss)		(184)
Other comprehensive income (loss)		0
Others		0
Ending balance		5,557		0
Songsan Green Energy Co., Ltd
Book value [Abstract]
Beginning balance		0
Acquisition		1,400
Disposal		0
Dividends received		0
Share of profit (loss)		(13)
Other comprehensive income (loss)		0
Others		0
Ending balance		1,387	[3]	0
Changwon Nu-ri Energy Co., Ltd
Book value [Abstract]
Beginning balance		0
Acquisition		500
Disposal		0
Dividends received		0
Share of profit (loss)		(3)
Other comprehensive income (loss)		0
Others		0
Ending balance		497	[3]	0
Hasami Wind Farm Corporation
Book value [Abstract]
Beginning balance		0
Acquisition		1,596
Disposal		0
Dividends received		0
Share of profit (loss)		(7)
Other comprehensive income (loss)		0
Others		0
Ending balance		1,589		0
PungBack Wind Farm Corporation
Book value [Abstract]
Beginning balance		0
Acquisition		7,884
Disposal		0
Dividends received		0
Share of profit (loss)		(1,141)
Other comprehensive income (loss)		0
Others		0
Ending balance		6,743	[17]	0
Trumbull Asset Management, LLC
Book value [Abstract]
Beginning balance		0
Acquisition		0
Disposal		0
Dividends received		0
Share of profit (loss)		252
Other comprehensive income (loss)		(1)
Others		(5)
Ending balance		246	[18]	0
S-Power Chile SpA
Book value [Abstract]
Beginning balance		0
Acquisition		127
Disposal		0
Dividends received		0
Share of profit (loss)		0
Other comprehensive income (loss)		0
Others		0
Ending balance		127		0
Seungmun Green Energy
Book value [Abstract]
Beginning balance		0
Acquisition		8,973
Disposal		0
Dividends received		0
Share of profit (loss)		120
Other comprehensive income (loss)		(39)
Others		0
Ending balance		9,054		0
Seobusambo highway photovoltaics Co., Ltd
Book value [Abstract]
Beginning balance		0
Acquisition		(1)
Disposal		0
Dividends received		0
Share of profit (loss)		0
Other comprehensive income (loss)		0
Others		3,067
Ending balance		₩ 3,066	[19]	₩ 0
[1]The effective percentage of ownership is more than 50%. However, according to the shareholders’ agreement, all critical financial and operating decisions must be agreed to by all ownership parties. Accordingly, the entities are classified as joint ventures.[2]The effective percentage of ownership is more than 50%. However, according to the shareholders’ agreement, all critical financial and operating decisions must be agreed to by all ownership parties and the Group can exercise same voting rights as other shareholders at the board of directors. Accordingly, the entities are classified as joint ventures.[3]The effective percentage of ownership is less than 50%. However, the entity is classified as a joint venture, because all consent was required to make decisions on related activities.[4]The Company is planning to sell its investment in SPC Power Corporation, KEPCO SPC Power Corporation, KV Holdings, Inc. and time or proceeds of sales are not specified as of December 31, 2022.[5]According to the shareholders’ agreement, the parties have joint control over all decisions related to finance and operation. Accordingly, the entity is classified as joint ventures.[6]The effective percentage of ownership increased due to the disproportionate capital reduction of financial investors during the year ended December 31, 2022.[7]The joint arrangement which the Company has joint control is structured through a separate company. The parties have joint control over the joint arrangement are classified as joint ventures, judging that they have rights to the net assets of the arrangement.[8]The joint arrangement which the Group has joint control is structured through a separate company. The parties have joint control over the joint arrangement are classified as joint ventures, judging that they have rights to the net assets of the arrangement.[9]The effective percentage of ownership is less than 20%. However, decisions in relevant actitvities must be agreed by ownership parties. Accordingly, the entity is classified as joint ventures.[10]Although the nominal percentage of ownership is 29%, the effective percentage of ownership is 54.24%, considering the interest of financial investors as a liability component.[11]The effective percentage of ownership is more than 50%. However, decisions in relevant actitvities must be agreed by all ownership parties. Accordingly, the entity is classified as a joint venture.[12]The effective percentage of ownership is less than 20%. However, according to the shareholders’ agreement, decisions related pricipal operation must be agreed by all ownership parties. Accordingly, the Company can exercise significant influence.[13]The effective percentage of ownership is less than 20%. However, according to the shareholders’ agreement, decisions related pricipal operation must be agreed by all ownership parties. Accordingly, the Group can exercise significant influence.[14]According to the Dayone Energy Co., Ltd. Investment Agreement signed in March 2011, the Company has a commitment to guarantee principal and certain returns on shares of Dayone Energy Co., Ltd. held by NH Power 2nd Co., Ltd. and the National Agricultural Cooperative Federation. Since NH Power 2nd Co., Ltd. and the National Agricultural Cooperative Federation have put option regarding their share of the entity, the Company was deemed to have acquired an additional 15.64% stake. As a result, the effective percentage of ownership is 46.3% in the current and prior period. In accordance with shareholders’ agreement signed during the current period, the Company has joint control with other investors in making important financial and operation decisions, so it has been reclassified from an associate to a joint venture.[15]According to the Dayone Energy Co., Ltd. Investment Agreement signed in March 2011, the Group has a commitment to guarantee principal and certain returns on shares of Dayone Energy Co., Ltd. held by NH Power 2nd Co., Ltd. and the National Agricultural Cooperative Federation. Since NH Power 2nd Co., Ltd. and the National Agricultural Cooperative Federation have put option regarding their share of the entity, the Group was deemed to have acquired an additional 15.64% stake. As a result, the effective percentage of ownership is 46.3% in the current and prior period. In accordance with shareholders’ agreement signed during the current period, the Group has joint control with other investors in making important financial and operation decisions, so it has been reclassified from an associate to a joint venture.[16]After addtional acquisition of the shares, the effective percentage of ownership is more than 50%. However, decisions in relevant actitvities must be agreed by all members of the board of directors. Accordingly, the entity is classified as a joint venture.[17]The effective percentage of ownership is 37%, considering potential common stock.[18]The effective percentage of ownership is more than 50%. However, decisions in relevant actitvities must be agreed by all members of the board of directors. Accordingly, the entity is classified as a joint venture.[19]Due to the changes in the agreement, the Group lost its control over the entity. Accordingly, the entity is reclassified to a joint venture from a subsidiary. Although the effective percentage of ownership is more than 50%, decisions in relevant actitvities must be agreed by all members of the board of directors.

Investments in Joint Ventures 3

Investments in Joint Ventures 3 (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
KEPCO-Uhde Inc.
Disclosure of joint ventures [line items]
Total assets	₩ 48	₩ 128
Total liabilities	15	14
Sales	0	0
Profit (loss) for the year	(84)	(84)
Shuweihat Asia Power Investment B.V.
Disclosure of joint ventures [line items]
Total assets	135,646	75,652
Total liabilities	29	0
Sales	0	0
Profit (loss) for the year	(2,660)	23,905
Shuweihat Asia Operation & Maintenance Company
Disclosure of joint ventures [line items]
Total assets	3,037	2,586
Total liabilities	71	77
Sales	3,013	2,821
Profit (loss) for the year	2,099	2,002
Waterbury Lake Uranium L.P.
Disclosure of joint ventures [line items]
Total assets	66,706	65,240
Total liabilities	117	14
Sales	0	0
Profit (loss) for the year	0	0
ASM-BG Investicii AD
Disclosure of joint ventures [line items]
Total assets	72,999	74,977
Total liabilities	43,889	37,593
Sales	16,056	13,161
Profit (loss) for the year	6,230	5,365
RES Technology AD
Disclosure of joint ventures [line items]
Total assets	62,345	63,495
Total liabilities	32,079	30,090
Sales	11,205	8,142
Profit (loss) for the year	3,018	2,220
KV Holdings, Inc.
Disclosure of joint ventures [line items]
Total assets	24,149	6,318
Total liabilities	1	1
Sales	1	10
Profit (loss) for the year	353	2,405
KEPCO SPC Power Corporation
Disclosure of joint ventures [line items]
Total assets	267,904	290,981
Total liabilities	29,082	26,381
Sales	253,145	181,443
Profit (loss) for the year	44,751	49,499
Gansu Datang Yumen Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	67,651	75,268
Total liabilities	52,592	58,680
Sales	10,048	9,666
Profit (loss) for the year	(1,161)	(1,547)
Datang Chifeng Renewable Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	835,331	827,213
Total liabilities	355,377	315,746
Sales	140,343	120,989
Profit (loss) for the year	42,889	24,398
Datang KEPCO Chaoyang Renewable Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	168,680	198,437
Total liabilities	57,685	87,895
Sales	29,459	29,094
Profit (loss) for the year	4,919	3,905
Rabigh Electricity Company
Disclosure of joint ventures [line items]
Total assets	2,520,946	2,410,335
Total liabilities	1,855,836	1,910,203
Sales	322,108	266,822
Profit (loss) for the year	65,550	34,268
Rabigh Operation & Maintenance Company Limited
Disclosure of joint ventures [line items]
Total assets	23,664	29,107
Total liabilities	10,882	18,930
Sales	32,572	32,079
Profit (loss) for the year	9,176	9,808
Jamaica Public Service Company Limited
Disclosure of joint ventures [line items]
Total assets	2,310,611	2,174,800
Total liabilities	1,515,361	1,469,297
Sales	1,499,897	1,113,943
Profit (loss) for the year	69,458	41,277
KW Nuclear Components Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	40,381	42,033
Total liabilities	2,013	6,678
Sales	16,968	32,938
Profit (loss) for the year	6,755	12,335
Busan Shinho Solar Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	36,868	37,016
Total liabilities	9,991	13,653
Sales	10,543	7,918
Profit (loss) for the year	5,424	3,261
Global Trade Of Power System Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	5,628	2,443
Total liabilities	3,222	385
Sales	8,434	6,355
Profit (loss) for the year	351	76
Expressway Solar-light Power Generation Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	14,248	13,747
Total liabilities	4,740	3,113
Sales	3,711	2,637
Profit (loss) for the year	1,654	466
Amman Asia Electric Power Company
Disclosure of joint ventures [line items]
Total assets	759,885	731,745
Total liabilities	392,795	433,946
Sales	28,665	17,753
Profit (loss) for the year	39,090	30,815
KAPES, Inc.
Disclosure of joint ventures [line items]
Total assets	82,943	92,790
Total liabilities	45,068	59,099
Sales	20,006	87,775
Profit (loss) for the year	3,797	1,571
Honam Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	34,028	33,623
Total liabilities	17,522	19,800
Sales	8,781	5,395
Profit (loss) for the year	3,283	531
Korea Power Engineering Service Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	20,931	24,068
Total liabilities	1,817	5,397
Sales	9,176	11,259
Profit (loss) for the year	500	709
Chun-cheon Energy Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	629,202	610,650
Total liabilities	521,212	523,223
Sales	585,223	327,534
Profit (loss) for the year	19,940	(5,451)
Yeonggwangbaeksu Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	80,042	82,439
Total liabilities	59,070	64,290
Sales	14,150	8,411
Profit (loss) for the year	2,764	(2,302)
Nghi Son 2 Power LLC
Disclosure of joint ventures [line items]
Total assets	3,652,801	2,982,805
Total liabilities	2,835,123	3,020,684
Sales	589,023	548,027
Profit (loss) for the year	102,436	84,276
Kelar S.A
Disclosure of joint ventures [line items]
Total assets	689,802	655,236
Total liabilities	514,085	526,063
Sales	107,577	84,504
Profit (loss) for the year	943	3,641
PT. Tanjung Power Indonesia
Disclosure of joint ventures [line items]
Total assets	730,239	713,715
Total liabilities	464,791	580,727
Sales	99,169	89,491
Profit (loss) for the year	13,619	14,511
Incheon New Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	2,633	3,240
Total liabilities	755	2,606
Sales	4,497	2,336
Profit (loss) for the year	1,244	109
Seokmun Energy Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	212,509	219,414
Total liabilities	152,731	171,682
Sales	61,513	41,555
Profit (loss) for the year	12,064	(3,434)
Daehan Wind Power PSC
Disclosure of joint ventures [line items]
Total assets	145,065	137,388
Total liabilities	117,219	127,080
Sales	17,958	6,794
Profit (loss) for the year	5,524	7,581
Barakah One Company
Disclosure of joint ventures [line items]
Total assets	33,587,352	29,707,801
Total liabilities	34,422,965	29,951,656
Sales	498,129	253,653
Profit (loss) for the year	(444,338)	4,011
Nawah Energy Company
Disclosure of joint ventures [line items]
Total assets	338,883	155,191
Total liabilities	337,134	153,559
Sales	395,580	0
Profit (loss) for the year	3	0
Momentum
Disclosure of joint ventures [line items]
Total assets	7,315	7,546
Total liabilities	6,280	6,442
Sales	30,864	34,527
Profit (loss) for the year	1,036	1,105
Daegu Green Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	551,431	541,304
Total liabilities	459,881	459,536
Sales	516,254	295,645
Profit (loss) for the year	9,364	1,796
Yeonggwang Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	233,695	239,701
Total liabilities	189,737	202,410
Sales	31,221	25,892
Profit (loss) for the year	6,700	958
Chester Solar IV SpA
Disclosure of joint ventures [line items]
Total assets	12,728	11,966
Total liabilities	12,469	12,144
Sales	1,521	1,344
Profit (loss) for the year	(174)	(2,060)
Chester Solar V SpA
Disclosure of joint ventures [line items]
Total assets	4,364	4,034
Total liabilities	4,315	4,256
Sales	520	440
Profit (loss) for the year	83	(601)
Diego de Almagro Solar SpA
Disclosure of joint ventures [line items]
Total assets	15,908	15,155
Total liabilities	14,946	14,572
Sales	1,877	1,615
Profit (loss) for the year	(288)	(2,103)
South Jamaica Power Company Limited
Disclosure of joint ventures [line items]
Total assets	521,558	474,664
Total liabilities	289,359	287,852
Sales	314,064	224,159
Profit (loss) for the year	33,348	5,743
Daesan Green Energy Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	245,826	264,618
Total liabilities	190,918	203,921
Sales	101,689	88,147
Profit (loss) for the year	(6,641)	(3,310)
RE Holiday Holdings LLC
Disclosure of joint ventures [line items]
Total assets	351,243	335,130
Total liabilities	180,503	188,796
Sales	22,671	19,724
Profit (loss) for the year	3,022	10,897
RE Pioneer Holdings LLC
Disclosure of joint ventures [line items]
Total assets	263,232	220,390
Total liabilities	152,888	126,361
Sales	15,701	12,925
Profit (loss) for the year	369	9,307
RE Barren Ridge 1 Holdings LLC
Disclosure of joint ventures [line items]
Total assets	226,504	201,629
Total liabilities	100,436	87,291
Sales	11,740	10,575
Profit (loss) for the year	(903)	(541)
RE Astoria 2 LandCo LLC
Disclosure of joint ventures [line items]
Total assets	13,517	12,294
Total liabilities	319	298
Sales	1,004	889
Profit (loss) for the year	913	799
RE Barren Ridge LandCo LLC
Disclosure of joint ventures [line items]
Total assets	4,761	4,328
Total liabilities	95	89
Sales	389	345
Profit (loss) for the year	357	315
Laurel SpA
Disclosure of joint ventures [line items]
Total assets	11,221	10,566
Total liabilities	10,447	10,350
Sales	1,424	1,159
Profit (loss) for the year	54	(1,425)
KIAMCO KOWEPO Bannerton Hold Co Pty Ltd
Disclosure of joint ventures [line items]
Total assets	29,517	30,809
Total liabilities	74	1,573
Sales	0	0
Profit (loss) for the year	(260)	(916)
Chile Solar JV SpA
Disclosure of joint ventures [line items]
Total assets	75,246	68,445
Total liabilities	55,609	3,531
Sales	7,842	3,060
Profit (loss) for the year	6,425	1,408
Cheong-Song Noraesan Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	55,948	57,047
Total liabilities	41,464	43,106
Sales	7,988	7,929
Profit (loss) for the year	1,916	2,309
Chester Solar I SpA
Disclosure of joint ventures [line items]
Total assets	13,246	12,965
Total liabilities	10,933	11,043
Sales	1,094	1,065
Profit (loss) for the year	(221)	(1,146)
Solar Philippines Calatagan Corporation
Disclosure of joint ventures [line items]
Total assets	113,327	117,324
Total liabilities	36,756	46,759
Sales	17,728	19,418
Profit (loss) for the year	10,194	11,782
Saemangeum Solar Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	35,890	35,323
Total liabilities	6,817	5,771
Sales	0	0
Profit (loss) for the year	(479)	(631)
Chungsongmeon BongSan wind power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	81,030	74,683
Total liabilities	75,207	67,696
Sales	0	0
Profit (loss) for the year	(1,120)	(1,186)
Jaeun Resident Wind Power Plant Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	89,756	81,477
Total liabilities	82,047	74,724
Sales	0	0
Profit (loss) for the year	(190)	(1,325)
DE Energia SpA
Disclosure of joint ventures [line items]
Total assets	48,350	49,201
Total liabilities	62,481	59,587
Sales	5,959	5,219
Profit (loss) for the year	(1,109)	(2,954)
Dangjin Eco Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	98,714	98,010
Total liabilities	20,721	22,223
Sales	4,185	4,139
Profit (loss) for the year	700	805
Haemodum Solar Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	22,974	23,038
Total liabilities	16,103	16,750
Sales	2,556	1,799
Profit (loss) for the year	581	45
Yangyang Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	107,471	53,586
Total liabilities	85,829	31,291
Sales	0	0
Profit (loss) for the year	(634)	(965)
Horus Solar, S.A. De C.V.
Disclosure of joint ventures [line items]
Total assets	156,436	192,650
Total liabilities	133,714	177,514
Sales	5,568	8,392
Profit (loss) for the year	5,628	16,664
Recursos Solares PV De Mexico II, S.A. De C.V.
Disclosure of joint ventures [line items]
Total assets	173,262	153,855
Total liabilities	155,009	138,033
Sales	468	0
Profit (loss) for the year	457	4,842
Sunmex Renovables, S.A. De C.V.
Disclosure of joint ventures [line items]
Total assets	129,502	90,956
Total liabilities	118,449	80,218
Sales	0	0
Profit (loss) for the year	(1,008)	(333)
Stavro Holding II A.B.
Disclosure of joint ventures [line items]
Total assets	85,883	88,220
Total liabilities	27	87
Sales	0	0
Profit (loss) for the year	61	(276)
Solaseado Solar Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	363,492	367,915
Total liabilities	325,262	345,987
Sales	51,198	41,684
Profit (loss) for the year	16,301	4,170
Yeongam Solar Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	329,714	324,132
Total liabilities	281,791	292,213
Sales	44,568	37,301
Profit (loss) for the year	8,563	4,930
Samsu Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	71,123	69,213
Total liabilities	54,254	54,331
Sales	10,118	3,918
Profit (loss) for the year	1,987	1,162
Pulau Indah Power Plant Sdn. Bhd.
Disclosure of joint ventures [line items]
Total assets	760,536	404,458
Total liabilities	675,853	338,635
Sales	797	228
Profit (loss) for the year	6,723	(2,589)
Sam-Yang Photovoltaic Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets		50,837
Total liabilities		40,647
Sales		7,376
Profit (loss) for the year		150
NH-Amundi Global Infrastructure Investment Private Investment Trust 21
Disclosure of joint ventures [line items]
Total assets	71,851	70,910
Total liabilities	74	38
Sales	4,850	3,428
Profit (loss) for the year	5,431	6,468
Shin-han BNPP Private Investment Trust for East-West Sunlight Dream
Disclosure of joint ventures [line items]
Total assets	17,341	18,121
Total liabilities	22	23
Sales	38	333
Profit (loss) for the year	(10)	288
PT Barito Wahana Tenaga
Disclosure of joint ventures [line items]
Total assets	447,688	266,584
Total liabilities	0	39
Sales	0	0
Profit (loss) for the year	49,471	25,839
Cheongna Energy Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	385,935	357,248
Total liabilities	368,340	338,763
Sales	100,200	77,640
Profit (loss) for the year	(889)	12,743
Naepo Green Energy Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	448,309	222,885
Total liabilities	499,528	249,415
Sales	8,905	7,044
Profit (loss) for the year	(34,347)	(21,392)
Dayone Energy Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	470,677	452,509
Total liabilities	530,304	504,351
Sales	278,363	143,870
Profit (loss) for the year	(12,893)	409
OneEnergy Asia Limited
Disclosure of joint ventures [line items]
Total assets	1,039,987	136,247
Total liabilities	673,223	777
Sales	0	0
Profit (loss) for the year	16,041	(2,844)
KAS Investment I LLC
Disclosure of joint ventures [line items]
Total assets	61,907	52,681
Total liabilities	861	1,583
Sales	1,603	(19,390)
Profit (loss) for the year	6,998	(23,007)
KAS Investment II LLC
Disclosure of joint ventures [line items]
Total assets	61,661	52,476
Total liabilities	861	1,581
Sales	1,592	(19,311)
Profit (loss) for the year	6,967	(21,801)
Energyco LLC
Disclosure of joint ventures [line items]
Total assets	56,996
Total liabilities	52,304
Sales	7,898
Profit (loss) for the year	2,258
Energyco Co., Ltd. (formerly, Energyco LLC)
Disclosure of joint ventures [line items]
Total assets		59,662
Total liabilities		57,227
Sales		168
Profit (loss) for the year		(2,514)
CAES, LLC
Disclosure of joint ventures [line items]
Total assets	49,676	43,089
Total liabilities	6	0
Sales	0	0
Profit (loss) for the year	(547)	(923)
Hapcheon Floating Photovoltaic Power Plant Inc.
Disclosure of joint ventures [line items]
Total assets	78,768	73,978
Total liabilities	61,561	59,832
Sales	12,705	1,120
Profit (loss) for the year	3,061	(972)
Busan Industrial Solar Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	21,149	19,085
Total liabilities	18,016	17,937
Sales	3,190	1,879
Profit (loss) for the year	901	566
Bitsolar Energy Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	78,779	80,307
Total liabilities	83,324	85,340
Sales	9,557	8,298
Profit (loss) for the year	261	(1,105)
Pulau Indah O&M Sdn. Bhd.
Disclosure of joint ventures [line items]
Total assets	0	0
Total liabilities	0	0
Sales	0	0
Profit (loss) for the year	0	0
Guadalupe Solar SpA
Disclosure of joint ventures [line items]
Total assets	10,148	8,774
Total liabilities	8,790	7,839
Sales	924	12
Profit (loss) for the year	(43)	(1,119)
Omisan Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	142,274	128,724
Total liabilities	117,881	103,802
Sales	0	0
Profit (loss) for the year	(519)	(320)
Foresight Iberian Solar Group Holding, S.L.
Disclosure of joint ventures [line items]
Total assets	94,181	90,610
Total liabilities	81,997	79,519
Sales	0	168
Profit (loss) for the year	(1,365)	(603)
Yeongwol Eco Wind Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	87,856	43,784
Total liabilities	83,281	39,066
Sales	0	0
Profit (loss) for the year	(144)	421
Gurae Resident Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	11,649	6,932
Total liabilities	10,467	5,734
Sales	0	0
Profit (loss) for the year	(19)	42
Cheongju Eco Park Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	152,139	138,657
Total liabilities	116,639	120,485
Sales	66,260	6,454
Profit (loss) for the year	17,319	(1,708)
Enel X Midland Photovoltaic, LLC
Disclosure of joint ventures [line items]
Total assets	10,289	9,053
Total liabilities	1,010	611
Sales	1,684	122
Profit (loss) for the year	837	(31)
Geumsungsan Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	125,324	66,862
Total liabilities	115,196	47,906
Sales	0	0
Profit (loss) for the year	(1,770)	(2,146)
KEPCO KPS Carabao Corp.
Disclosure of joint ventures [line items]
Total assets	2,025	3,482
Total liabilities	1,582	2,516
Sales	611	5,309
Profit (loss) for the year	(327)	733
Prime Swedish Holding AB
Disclosure of joint ventures [line items]
Total assets	77,942	34,257
Total liabilities	114	20
Sales	0	0
Profit (loss) for the year	(577)	(5)
Goheung New Energy Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	136,682	55,145
Total liabilities	113,393	32,125
Sales	0	0
Profit (loss) for the year	(1,591)	(2,711)
Gunsan Land Solar Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	158,371	86,654
Total liabilities	121,785	60,996
Sales	28,828	432
Profit (loss) for the year	12,154	432
Capman Lynx SCA, SICAR
Disclosure of joint ventures [line items]
Total assets	112,718	113,658
Total liabilities	102,810	93,706
Sales	504	0
Profit (loss) for the year	(16,780)	0
International Offshore Power Transmission Holding Company Limited
Disclosure of joint ventures [line items]
Total assets	4,680	5
Total liabilities	71,468	0
Sales	0	0
Profit (loss) for the year	(68,093)	₩ 0
Pyeongchang Wind Power Co., Ltd
Disclosure of joint ventures [line items]
Total assets	70,599
Total liabilities	45,661
Sales	14,524
Profit (loss) for the year	3,693
Eumseong Eco Park Co., Ltd
Disclosure of joint ventures [line items]
Total assets	136,909
Total liabilities	119,736
Sales	0
Profit (loss) for the year	(636)
Songsan Green Energy Co., Ltd
Disclosure of joint ventures [line items]
Total assets	5,500
Total liabilities	0
Sales	0
Profit (loss) for the year	(69)
Changwon Nu-ri Energy Co., Ltd
Disclosure of joint ventures [line items]
Total assets	1,490
Total liabilities	0
Sales	0
Profit (loss) for the year	(10)
Hasami Wind Farm Corporation
Disclosure of joint ventures [line items]
Total assets	3,100
Total liabilities	0
Sales	0
Profit (loss) for the year	(23)
PungBack Wind Farm Corporation
Disclosure of joint ventures [line items]
Total assets	46,957
Total liabilities	31,667
Sales	0
Profit (loss) for the year	(3,089)
Trumbull Asset Management, LLC
Disclosure of joint ventures [line items]
Total assets	316
Total liabilities	0
Sales	656
Profit (loss) for the year	323
S-Power Chile SpA
Disclosure of joint ventures [line items]
Total assets	2,430
Total liabilities	2,450
Sales	1,334
Profit (loss) for the year	22
Seungmun Green Energy
Disclosure of joint ventures [line items]
Total assets	46,283
Total liabilities	18,843
Sales	0
Profit (loss) for the year	367
Seobusambo highway photovoltaics Co., Ltd
Disclosure of joint ventures [line items]
Total assets	8,286
Total liabilities	4,453
Sales	217
Profit (loss) for the year	₩ 265

Investments in Joint Ventures 4

Investments in Joint Ventures 4 (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Disclosure of joint ventures [line items]
Book value	₩ 3,147,584		₩ 2,239,011		₩ 1,919,746
KEPCO-Uhde Inc.
Disclosure of joint ventures [line items]
Net assets	₩ 33		₩ 114
Effective percentage of ownership	50.85%		50.85%
Share in net assets	₩ 17		₩ 58
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	17	[1]	58	[2]	100
Shuweihat Asia Power Investment B.V.
Disclosure of joint ventures [line items]
Net assets	₩ 135,617		₩ 75,652
Effective percentage of ownership	49%		49%
Share in net assets	₩ 66,452		₩ 37,069
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	66,452		37,069		13,264
Shuweihat Asia Operation & Maintenance Company
Disclosure of joint ventures [line items]
Net assets	₩ 2,966		₩ 2,509
Effective percentage of ownership	55%		55%
Share in net assets	₩ 1,631		₩ 1,380
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	1,631	[1]	1,380	[2]	1,057
Waterbury Lake Uranium L.P.
Disclosure of joint ventures [line items]
Net assets	₩ 66,589		₩ 65,226
Effective percentage of ownership	32.59%		33.10%
Share in net assets	₩ 21,701		₩ 21,590
Investment differential	49		0
Intercompany transaction	0		0
Others	0		0
Book value	21,750	[3]	21,590		19,797
ASM-BG Investicii AD
Disclosure of joint ventures [line items]
Net assets	₩ 29,110		₩ 37,384
Effective percentage of ownership	50%		50%
Share in net assets	₩ 14,555		₩ 18,692
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	14,555		18,692		18,200
RES Technology AD
Disclosure of joint ventures [line items]
Net assets	₩ 30,266		₩ 33,405
Effective percentage of ownership	50%		50%
Share in net assets	₩ 15,133		₩ 16,703
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	15,133		16,703		15,930
KV Holdings, Inc.
Disclosure of joint ventures [line items]
Net assets	₩ 24,148		₩ 6,317
Effective percentage of ownership	40%		40%
Share in net assets	₩ 9,659		₩ 2,527
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	9,659	[4]	2,527		2,405
KEPCO SPC Power Corporation
Disclosure of joint ventures [line items]
Net assets	₩ 238,822		₩ 264,600
Effective percentage of ownership	75.20%		75.20%
Share in net assets	₩ 179,594		₩ 198,979
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	179,594	[1],[4]	198,979	[2]	201,663
Gansu Datang Yumen Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 15,059		₩ 16,588
Effective percentage of ownership	40%		40%
Share in net assets	₩ 6,024		₩ 6,635
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	6,024		6,635		6,530
Datang Chifeng Renewable Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 479,954		₩ 511,467
Effective percentage of ownership	40%		40%
Share in net assets	₩ 191,982		₩ 204,587
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	191,982		204,587		188,478
Datang KEPCO Chaoyang Renewable Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 110,995		₩ 110,542
Effective percentage of ownership	40%		40%
Share in net assets	₩ 44,398		₩ 44,217
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	44,398		44,217		42,530
Rabigh Electricity Company
Disclosure of joint ventures [line items]
Net assets	₩ 665,110		₩ 500,132
Effective percentage of ownership	40%		40%
Share in net assets	₩ 266,044		₩ 200,053
Investment differential	0		0
Intercompany transaction	(50,632)		(55,571)
Others	(805)		(804)
Book value	214,607		143,678		97,157
Rabigh Operation & Maintenance Company Limited
Disclosure of joint ventures [line items]
Net assets	₩ 12,782		₩ 10,177
Effective percentage of ownership	40%		40%
Share in net assets	₩ 5,113		₩ 4,071
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	5,113		4,071		3,813
Jamaica Public Service Company Limited
Disclosure of joint ventures [line items]
Net assets	₩ 795,250		₩ 705,503
Effective percentage of ownership	40%		40%
Share in net assets	₩ 318,100		₩ 282,201
Investment differential	29,357		29,357
Intercompany transaction	0		0
Others	(16,050)		(16,909)
Book value	331,407		294,649		266,221
KW Nuclear Components Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 38,368		₩ 35,355
Effective percentage of ownership	45%		45%
Share in net assets	₩ 17,266		₩ 15,910
Investment differential	0		0
Intercompany transaction	0		0
Others	(176)		(176)
Book value	17,090		15,734		11,171
Busan Shinho Solar Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 26,877		₩ 23,363
Effective percentage of ownership	25%		25%
Share in net assets	₩ 6,719		₩ 5,841
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	6,719		5,841		5,378
Global Trade Of Power System Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 2,406		₩ 2,058
Effective percentage of ownership	29%		29%
Share in net assets	₩ 698		₩ 597
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	698	[5]	597	[5]	546
Expressway Solar-light Power Generation Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 9,508		₩ 10,634
Effective percentage of ownership	50%		29%
Share in net assets	₩ 4,754		₩ 3,084
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	4,754	[6]	3,084	[5]	2,896
Amman Asia Electric Power Company
Disclosure of joint ventures [line items]
Net assets	₩ 367,090		₩ 297,799
Effective percentage of ownership	60%		60%
Share in net assets	₩ 220,254		₩ 178,679
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	220,254	[1]	178,679	[2]	161,253
KAPES, Inc.
Disclosure of joint ventures [line items]
Net assets	₩ 37,875		₩ 33,691
Effective percentage of ownership	51%		51%
Share in net assets	₩ 19,316		₩ 17,182
Investment differential	0		0
Intercompany transaction	(22,451)		(20,697)
Others	3,135		3,515
Book value	0	[1]	0	[2]	0
Honam Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 16,506		₩ 13,823
Effective percentage of ownership	29%		29%
Share in net assets	₩ 4,787		₩ 4,009
Investment differential	32		32
Intercompany transaction	0		0
Others	0		0
Book value	4,819		4,041		3,887
Korea Power Engineering Service Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 19,114		₩ 18,671
Effective percentage of ownership	29%		29%
Share in net assets	₩ 5,543		₩ 5,415
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	5,543		5,415		5,362
Chun-cheon Energy Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 107,990		₩ 87,427
Effective percentage of ownership	29.90%		29.90%
Share in net assets	₩ 32,289		₩ 26,141
Investment differential	3		3
Intercompany transaction	0		0
Others	(248)		(248)
Book value	32,044		25,896		27,518
Yeonggwangbaeksu Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 20,972		₩ 18,149
Effective percentage of ownership	15%		15%
Share in net assets	₩ 3,146		₩ 2,722
Investment differential	5		6
Intercompany transaction	0		0
Others	0		0
Book value	3,151	[5]	2,728	[5]	3,124
Nghi Son 2 Power LLC
Disclosure of joint ventures [line items]
Net assets	₩ 817,678		₩ (37,879)
Effective percentage of ownership	50%		50%
Share in net assets	₩ 408,839		₩ (18,940)
Investment differential	0		0
Intercompany transaction	0		0
Others	0		18,940
Book value	408,839		0		0
Kelar S.A
Disclosure of joint ventures [line items]
Net assets	₩ 175,717		₩ 129,173
Effective percentage of ownership	65%		65%
Share in net assets	₩ 114,216		₩ 83,962
Investment differential	2,921		2,733
Intercompany transaction	0		0
Others	0		0
Book value	117,137	[1]	86,695	[2]	71,449
PT. Tanjung Power Indonesia
Disclosure of joint ventures [line items]
Net assets	₩ 265,448		₩ 132,988
Effective percentage of ownership	35%		35%
Share in net assets	₩ 92,907		₩ 46,546
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	92,907		46,546		33,063
Incheon New Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 1,878		₩ 634
Effective percentage of ownership	29%		29%
Share in net assets	₩ 545		₩ 184
Investment differential	0		0
Intercompany transaction	0		0
Others	(347)		(184)
Book value	198	[7]	0	[8]	0
Seokmun Energy Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 59,778		₩ 47,732
Effective percentage of ownership	29%		29%
Share in net assets	₩ 17,336		₩ 13,842
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	17,336		13,842		14,814
Daehan Wind Power PSC
Disclosure of joint ventures [line items]
Net assets	₩ 27,846		₩ 10,308
Effective percentage of ownership	50%		50%
Share in net assets	₩ 13,923		₩ 5,154
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	13,923		5,154		0
Barakah One Company
Disclosure of joint ventures [line items]
Net assets	₩ (835,613)		₩ (243,855)
Effective percentage of ownership	18%		18%
Share in net assets	₩ (150,410)		₩ (43,894)
Investment differential	0		0
Intercompany transaction	56,437		1,058
Others	93,973		42,836
Book value	0	[9]	0	[9]	0
Nawah Energy Company
Disclosure of joint ventures [line items]
Net assets	₩ 1,749		₩ 1,632
Effective percentage of ownership	18%		18%
Share in net assets	₩ 315		₩ 294
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	315	[9]	294	[9]	270
Momentum
Disclosure of joint ventures [line items]
Net assets	₩ 1,035		₩ 1,104
Effective percentage of ownership	33.33%		33.33%
Share in net assets	₩ 345		₩ 368
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	345		368		565
Daegu Green Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 91,550		₩ 81,768
Effective percentage of ownership	54.24%		54.24%
Share in net assets	₩ 49,657		₩ 44,351
Investment differential	84		84
Intercompany transaction	0		0
Others	(20,381)		(20,381)
Book value	29,360	[10]	24,054	[10]	23,045
Yeonggwang Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 43,958		₩ 37,291
Effective percentage of ownership	46%		46%
Share in net assets	₩ 20,221		₩ 17,154
Investment differential	492		492
Intercompany transaction	0		0
Others	0		0
Book value	20,713		17,646		17,256
Chester Solar IV SpA
Disclosure of joint ventures [line items]
Net assets	₩ 259		₩ (178)
Effective percentage of ownership	45%		45%
Share in net assets	₩ 117		₩ (80)
Investment differential	64		60
Intercompany transaction	0		0
Others	0		20
Book value	181		0		1,064
Chester Solar V SpA
Disclosure of joint ventures [line items]
Net assets	₩ 49		₩ (222)
Effective percentage of ownership	45%		45%
Share in net assets	₩ 22		₩ (100)
Investment differential	134		125
Intercompany transaction	0		0
Others	0		0
Book value	156		25		277
Diego de Almagro Solar SpA
Disclosure of joint ventures [line items]
Net assets	₩ 962		₩ 583
Effective percentage of ownership	45%		45%
Share in net assets	₩ 433		₩ 262
Investment differential	107		100
Intercompany transaction	0		0
Others	0		0
Book value	540		362		1,490
South Jamaica Power Company Limited
Disclosure of joint ventures [line items]
Net assets	₩ 232,199		₩ 186,812
Effective percentage of ownership	20%		20%
Share in net assets	₩ 46,440		₩ 37,362
Investment differential	0		0
Intercompany transaction	0		0
Others	(3)		(2)
Book value	46,437		37,360		31,897
Daesan Green Energy Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 54,908		₩ 60,697
Effective percentage of ownership	35%		35%
Share in net assets	₩ 19,218		₩ 21,244
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	19,218		21,244		22,552
RE Holiday Holdings LLC
Disclosure of joint ventures [line items]
Net assets	₩ 170,740		₩ 146,334
Effective percentage of ownership	50%		50%
Share in net assets	₩ 85,370		₩ 73,167
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	85,370		73,167		68,809
RE Pioneer Holdings LLC
Disclosure of joint ventures [line items]
Net assets	₩ 110,344		₩ 94,029
Effective percentage of ownership	50%		50%
Share in net assets	₩ 55,172		₩ 47,015
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	55,172		47,015		49,639
RE Barren Ridge 1 Holdings LLC
Disclosure of joint ventures [line items]
Net assets	₩ 126,068		₩ 114,338
Effective percentage of ownership	50%		50%
Share in net assets	₩ 63,034		₩ 57,169
Investment differential	0		0
Intercompany transaction	0		0
Others	(59,684)		(55,286)
Book value	3,350		1,883		4,466
RE Astoria 2 LandCo LLC
Disclosure of joint ventures [line items]
Net assets	₩ 13,198		₩ 11,996
Effective percentage of ownership	50%		50%
Share in net assets	₩ 6,599		₩ 5,998
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	6,599		5,998		5,230
RE Barren Ridge LandCo LLC
Disclosure of joint ventures [line items]
Net assets	₩ 4,666		₩ 4,239
Effective percentage of ownership	50%		50%
Share in net assets	₩ 2,333		₩ 2,120
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	2,333		2,120		1,847
Laurel SpA
Disclosure of joint ventures [line items]
Net assets	₩ 774		₩ 216
Effective percentage of ownership	45%		45%
Share in net assets	₩ 348		₩ 97
Investment differential	206		193
Intercompany transaction	0		0
Others	0		0
Book value	554		290		1,092
KIAMCO KOWEPO Bannerton Hold Co Pty Ltd
Disclosure of joint ventures [line items]
Net assets	₩ 29,443		₩ 29,236
Effective percentage of ownership	12.37%		12.37%
Share in net assets	₩ 3,642		₩ 3,616
Investment differential	9		9
Intercompany transaction	0		0
Others	0		0
Book value	3,651	[5]	3,625	[5]	4,129
Chile Solar JV SpA
Disclosure of joint ventures [line items]
Net assets	₩ 19,637		₩ 64,914
Effective percentage of ownership	50%		50%
Share in net assets	₩ 9,819		₩ 32,457
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	9,819		32,457		34,883
Cheong-Song Noraesan Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 14,484		₩ 13,941
Effective percentage of ownership	29.01%		29.01%
Share in net assets	₩ 4,202		₩ 4,045
Investment differential	61		61
Intercompany transaction	0		0
Others	0		0
Book value	4,263	[3]	4,106		3,453
Chester Solar I SpA
Disclosure of joint ventures [line items]
Net assets	₩ 2,313		₩ 1,922
Effective percentage of ownership	45%		45%
Share in net assets	₩ 1,041		₩ 865
Investment differential	273		255
Intercompany transaction	0		0
Others	0		0
Book value	1,314		1,120		1,621
Solar Philippines Calatagan Corporation
Disclosure of joint ventures [line items]
Net assets	₩ 76,571		₩ 70,565
Effective percentage of ownership	38%		38%
Share in net assets	₩ 29,097		₩ 26,815
Investment differential	0		0
Intercompany transaction	0		0
Others	27,805		31,416
Book value	56,902		58,231		49,017
Saemangeum Solar Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 29,073		₩ 29,552
Effective percentage of ownership	81.01%		81.01%
Share in net assets	₩ 23,551		₩ 23,939
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	23,551	[11]	23,939	[11]	24,292
Chungsongmeon BongSan wind power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 5,823		₩ 6,987
Effective percentage of ownership	29%		29%
Share in net assets	₩ 1,689		₩ 2,026
Investment differential	1,781		1,782
Intercompany transaction	0		0
Others	0		0
Book value	3,470	[5]	3,808	[5]	4,124
Jaeun Resident Wind Power Plant Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 7,709		₩ 6,753
Effective percentage of ownership	29%		29%
Share in net assets	₩ 2,236		₩ 1,958
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	2,236	[5]	1,958		2,195
DE Energia SpA
Disclosure of joint ventures [line items]
Net assets	₩ (14,131)		₩ (10,386)
Effective percentage of ownership	49%		49%
Share in net assets	₩ (6,924)		₩ (5,089)
Investment differential	0		0
Intercompany transaction	0		0
Others	16,460		14,010
Book value	9,536		8,921		8,187
Dangjin Eco Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 77,993		₩ 75,787
Effective percentage of ownership	34%		34%
Share in net assets	₩ 26,518		₩ 25,768
Investment differential	341		341
Intercompany transaction	0		0
Others	0		0
Book value	26,859		26,109		25,523
Haemodum Solar Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 6,871		₩ 6,288
Effective percentage of ownership	49%		49%
Share in net assets	₩ 3,367		₩ 3,081
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	3,367		3,081		3,065
Yangyang Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 21,642		₩ 22,295
Effective percentage of ownership	50%		50%
Share in net assets	₩ 10,821		₩ 11,148
Investment differential	43		43
Intercompany transaction	0		0
Others	0		0
Book value	10,864		11,191		10,485
Horus Solar, S.A. De C.V.
Disclosure of joint ventures [line items]
Net assets	₩ 22,722		₩ 15,136
Effective percentage of ownership	14.95%		14.95%
Share in net assets	₩ 3,396		₩ 2,262
Investment differential	3,580		3,580
Intercompany transaction	0		0
Others	0		0
Book value	6,976	[12]	5,842	[13]	3,394
Recursos Solares PV De Mexico II, S.A. De C.V.
Disclosure of joint ventures [line items]
Net assets	₩ 18,253		₩ 15,822
Effective percentage of ownership	14.95%		14.95%
Share in net assets	₩ 2,728		₩ 2,365
Investment differential	2,171		2,171
Intercompany transaction	0		0
Others	0		0
Book value	4,899	[12]	4,536	[13]	3,660
Sunmex Renovables, S.A. De C.V.
Disclosure of joint ventures [line items]
Net assets	₩ 11,053		₩ 10,738
Effective percentage of ownership	14.95%		14.95%
Share in net assets	₩ 1,652		₩ 1,605
Investment differential	5		5
Intercompany transaction	0		0
Others	0		0
Book value	1,657	[12]	1,610	[13]	240
Stavro Holding II A.B.
Disclosure of joint ventures [line items]
Net assets	₩ 85,856		₩ 88,133
Effective percentage of ownership	20%		20%
Share in net assets	₩ 17,171		₩ 17,627
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	17,171		17,627		9,277
Solaseado Solar Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 38,230		₩ 21,928
Effective percentage of ownership	38.90%		38.90%
Share in net assets	₩ 14,872		₩ 8,530
Investment differential	1,361		1,361
Intercompany transaction	0		0
Others	0		0
Book value	16,233		9,891		9,915
Yeongam Solar Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 47,923		₩ 31,919
Effective percentage of ownership	19%		19%
Share in net assets	₩ 9,105		₩ 6,065
Investment differential	774		773
Intercompany transaction	0		0
Others	0		0
Book value	9,879	[5]	6,838	[5]	6,042
Samsu Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 16,869		₩ 14,882
Effective percentage of ownership	19%		19%
Share in net assets	₩ 3,205		₩ 2,828
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	3,205	[5]	2,828	[5]	2,607
Pulau Indah Power Plant Sdn. Bhd.
Disclosure of joint ventures [line items]
Net assets	₩ 84,683		₩ 65,823
Effective percentage of ownership	25%		25%
Share in net assets	₩ 21,171		₩ 16,456
Investment differential	5,643		5,643
Intercompany transaction	0		0
Others	0		0
Book value	26,814		22,099		11,204
Sam-Yang Photovoltaic Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets			₩ 10,190
Effective percentage of ownership			49%
Share in net assets			₩ 4,993
Investment differential			0
Intercompany transaction			0
Others			0
Book value	0		4,993		5,535
NH-Amundi Global Infrastructure Investment Private Investment Trust 21
Disclosure of joint ventures [line items]
Net assets	₩ 71,777		₩ 70,872
Effective percentage of ownership	29.53%		29.53%
Share in net assets	₩ 21,196		₩ 20,929
Investment differential	527		527
Intercompany transaction	0		0
Others	0		0
Book value	21,723	[11]	21,456		22,242
Shin-han BNPP Private Investment Trust for East-West Sunlight Dream
Disclosure of joint ventures [line items]
Net assets	₩ 17,319		₩ 18,098
Effective percentage of ownership	90%		90%
Share in net assets	₩ 15,587		₩ 16,288
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	15,587	[1]	16,288	[2]	16,129
PT Barito Wahana Tenaga
Disclosure of joint ventures [line items]
Net assets	₩ 447,688		₩ 266,545
Effective percentage of ownership	30.61%		30.61%
Share in net assets	₩ 137,047		₩ 81,595
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	137,047		81,595		63,029
Cheongna Energy Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 17,595		₩ 18,485
Effective percentage of ownership	50.10%		50.10%
Share in net assets	₩ 8,815		₩ 9,261
Investment differential	3,137		3,137
Intercompany transaction	(1,194)		(1,200)
Others	0		0
Book value	10,758	[11]	11,198	[11]	4,940
Naepo Green Energy Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ (51,219)		₩ (26,530)
Effective percentage of ownership	29.20%		29.20%
Share in net assets	₩ (14,956)		₩ (7,747)
Investment differential	0		0
Intercompany transaction	0		0
Others	14,956		7,747
Book value	0		0		0
Dayone Energy Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ (59,627)		₩ (51,842)
Effective percentage of ownership	46.30%		46.30%
Share in net assets	₩ (27,607)		₩ (24,003)
Investment differential	0		0
Intercompany transaction	(868)		(882)
Others	28,475		24,885
Book value	0	[14]	0	[15]	0
OneEnergy Asia Limited
Disclosure of joint ventures [line items]
Net assets	₩ 366,764		₩ 135,470
Effective percentage of ownership	40%		40%
Share in net assets	₩ 146,706		₩ 54,188
Investment differential	25,512		25,512
Intercompany transaction	0		0
Others	0		0
Book value	172,218		79,700		56,654
KAS Investment I LLC
Disclosure of joint ventures [line items]
Net assets	₩ 61,046		₩ 51,098
Effective percentage of ownership	29.89%		29.89%
Share in net assets	₩ 18,247		₩ 15,273
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	18,247	[3]	15,273		23,437
KAS Investment II LLC
Disclosure of joint ventures [line items]
Net assets	₩ 60,800		₩ 50,895
Effective percentage of ownership	29.89%		29.89%
Share in net assets	₩ 18,173		₩ 15,213
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	18,173	[3]	15,213		23,343
Energyco Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 4,692		₩ 2,435
Effective percentage of ownership	29%		29%
Share in net assets	₩ 1,361		₩ 706
Investment differential	829		829
Intercompany transaction	0		0
Others	0		0
Book value	2,190		1,535
CAES, LLC
Disclosure of joint ventures [line items]
Net assets	₩ 49,670		₩ 43,089
Effective percentage of ownership	36%		36%
Share in net assets	₩ 17,881		₩ 15,512
Investment differential	2,924		2,923
Intercompany transaction	0		0
Others	0		0
Book value	20,805		18,435		17,626
Hapcheon Floating Photovoltaic Power Plant Inc.
Disclosure of joint ventures [line items]
Net assets	₩ 17,207		₩ 14,146
Effective percentage of ownership	49%		49%
Share in net assets	₩ 8,432		₩ 6,932
Investment differential	39		39
Intercompany transaction	0		0
Others	0		0
Book value	8,471	[5]	6,971	[5]	1,890
Busan Industrial Solar Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 3,133		₩ 1,148
Effective percentage of ownership	28.02%		28.02%
Share in net assets	₩ 878		₩ 322
Investment differential	290		290
Intercompany transaction	0		0
Others	0		0
Book value	1,168		612		510
Bitsolar Energy Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ (4,545)		₩ (5,033)
Effective percentage of ownership	27.10%		27.10%
Share in net assets	₩ (1,232)		₩ (1,364)
Investment differential	352		352
Intercompany transaction	0		0
Others	1,232		1,364
Book value	352		352		352
Pulau Indah O&M Sdn. Bhd.
Disclosure of joint ventures [line items]
Net assets	₩ 0		₩ 0
Effective percentage of ownership	60%		60%
Share in net assets	₩ 0		₩ 0
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	0		0		0
Guadalupe Solar SpA
Disclosure of joint ventures [line items]
Net assets	₩ 1,358		₩ 935
Effective percentage of ownership	60%		60%
Share in net assets	₩ 815		₩ 561
Investment differential	98		98
Intercompany transaction	0		0
Others	0		0
Book value	913	[11]	659	[11]	0
Omisan Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 24,393		₩ 24,922
Effective percentage of ownership	42%		42%
Share in net assets	₩ 10,245		₩ 10,467
Investment differential	166		166
Intercompany transaction	0		0
Others	0		0
Book value	10,411		10,633		0
Foresight Iberian Solar Group Holding, S.L.
Disclosure of joint ventures [line items]
Net assets	₩ 12,184		₩ 11,091
Effective percentage of ownership	75%		75%
Share in net assets	₩ 9,138		₩ 8,318
Investment differential	1,427		1,425
Intercompany transaction	0		0
Others	0		0
Book value	10,565		9,743		0
Yeongwol Eco Wind Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 4,575		₩ 4,718
Effective percentage of ownership	29%		29%
Share in net assets	₩ 1,327		₩ 1,368
Investment differential	1,828		1,828
Intercompany transaction	0		0
Others	0		0
Book value	3,155		3,196		0
Gurae Resident Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 1,182		₩ 1,198
Effective percentage of ownership	29%		29%
Share in net assets	₩ 343		₩ 347
Investment differential	48		48
Intercompany transaction	0		0
Others	0		0
Book value	391		395		0
Cheongju Eco Park Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 35,500		₩ 18,172
Effective percentage of ownership	29%		29%
Share in net assets	₩ 10,295		₩ 5,270
Investment differential	195		195
Intercompany transaction	0		0
Others	0		0
Book value	10,490		5,465		0
Enel X Midland Photovoltaic, LLC
Disclosure of joint ventures [line items]
Net assets	₩ 9,279		₩ 8,442
Effective percentage of ownership	20%		20%
Share in net assets	₩ 1,856		₩ 1,688
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	1,856		1,688		0
Geumsungsan Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 10,128		₩ 18,956
Effective percentage of ownership	29%		29%
Share in net assets	₩ 2,937		₩ 5,497
Investment differential	556		556
Intercompany transaction	0		0
Others	0		0
Book value	3,493		6,053		0
KEPCO KPS Carabao Corp.
Disclosure of joint ventures [line items]
Net assets	₩ 443		₩ 966
Effective percentage of ownership	40%		40%
Share in net assets	₩ 177		₩ 386
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	177	[7]	386		0
Prime Swedish Holding AB
Disclosure of joint ventures [line items]
Net assets	₩ 77,828		₩ 34,237
Effective percentage of ownership	45%		45%
Share in net assets	₩ 35,023		₩ 15,407
Investment differential	1,222		34
Intercompany transaction	0		0
Others	0		0
Book value	36,245		15,441		0
Goheung New Energy Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 23,289		₩ 23,020
Effective percentage of ownership	46.15%		46.15%
Share in net assets	₩ 10,748		₩ 10,624
Investment differential	1,084		1,084
Intercompany transaction	0		0
Others	0		0
Book value	11,832		11,708		0
Gunsan Land Solar Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 36,586		₩ 25,658
Effective percentage of ownership	75.29%		75.29%
Share in net assets	₩ 27,544		₩ 19,317
Investment differential	0		0
Intercompany transaction	0		0
Others	0		0
Book value	27,544	[11]	19,317	[11]	0
Capman Lynx SCA, SICAR
Disclosure of joint ventures [line items]
Net assets	₩ 9,908		₩ 19,952
Effective percentage of ownership	50%		50%
Share in net assets	₩ 4,954		₩ 9,976
Investment differential	0		0
Intercompany transaction	0		0
Others	(4,954)		0
Book value	0		9,976		0
International Offshore Power Transmission Holding Company Limited
Disclosure of joint ventures [line items]
Net assets	₩ (66,788)		₩ 5
Effective percentage of ownership	35%		35%
Share in net assets	₩ (23,376)		₩ 2
Investment differential	(2)		(2)
Intercompany transaction	0		0
Others	23,378		0
Book value	0		0		₩ 0
Pyeongchang Wind Power Co., Ltd. [Member]
Disclosure of joint ventures [line items]
Net assets	₩ 24,938
Effective percentage of ownership	58%
Share in net assets	₩ 14,464
Investment differential	0
Intercompany transaction	0
Others	0
Book value	14,464	[16]	0
Eumseong Eco Park [Member]
Disclosure of joint ventures [line items]
Net assets	₩ 17,173
Effective percentage of ownership	29%
Share in net assets	₩ 4,980
Investment differential	577
Intercompany transaction	0
Others	0
Book value	5,557		0
Songsan Green Energy [Member]
Disclosure of joint ventures [line items]
Net assets	₩ 5,500
Effective percentage of ownership	25%
Share in net assets	₩ 1,375
Investment differential	12
Intercompany transaction	0
Others	0
Book value	1,387	[3]	0
Changwon Nuri Energy [Member]
Disclosure of joint ventures [line items]
Net assets	₩ 1,490
Effective percentage of ownership	33.33%
Share in net assets	₩ 497
Investment differential	0
Intercompany transaction	0
Others	0
Book value	497	[3]	0
Hasami Wind Farm Corporation [Member]
Disclosure of joint ventures [line items]
Net assets	₩ 3,100
Effective percentage of ownership	29%
Share in net assets	₩ 899
Investment differential	690
Intercompany transaction	0
Others	0
Book value	1,589		0
PungBack Wind Farm Corporation [Member]
Disclosure of joint ventures [line items]
Net assets	₩ 15,290
Effective percentage of ownership	37%
Share in net assets	₩ 5,657
Investment differential	1,086
Intercompany transaction	0
Others	0
Book value	6,743	[17]	0
Trumbull Asset Management, LLC [Member]
Disclosure of joint ventures [line items]
Net assets	₩ 316
Effective percentage of ownership	78%
Share in net assets	₩ 246
Investment differential	0
Intercompany transaction	0
Others	0
Book value	246	[18]	0
SPower Chile SpA [Member]
Disclosure of joint ventures [line items]
Net assets	₩ (20)
Effective percentage of ownership	50%
Share in net assets	₩ (10)
Investment differential	0
Intercompany transaction	0
Others	137
Book value	127		0
Seungmun Green Energy [Member]
Disclosure of joint ventures [line items]
Net assets	₩ 27,440
Effective percentage of ownership	33%
Share in net assets	₩ 9,054
Investment differential	0
Intercompany transaction	0
Others	0
Book value	9,054		0
Seobusambo highway photovoltaics Co., Ltd. [Member]
Disclosure of joint ventures [line items]
Net assets	₩ 3,833
Effective percentage of ownership	80%
Share in net assets	₩ 3,066
Investment differential	0
Intercompany transaction	0
Others	0
Book value	₩ 3,066	[19]	₩ 0
[1]The effective percentage of ownership is more than 50%. However, according to the shareholders’ agreement, all critical financial and operating decisions must be agreed to by all ownership parties and the Group can exercise same voting rights as other shareholders at the board of directors. Accordingly, the entities are classified as joint ventures.[2]The effective percentage of ownership is more than 50%. However, according to the shareholders’ agreement, all critical financial and operating decisions must be agreed to by all ownership parties. Accordingly, the entities are classified as joint ventures.[3]The effective percentage of ownership is less than 50%. However, the entity is classified as a joint venture, because all consent was required to make decisions on related activities.[4]The Company is planning to sell its investment in SPC Power Corporation, KEPCO SPC Power Corporation, KV Holdings, Inc. and time or proceeds of sales are not specified as of December 31, 2022.[5]According to the shareholders’ agreement, the parties have joint control over all decisions related to finance and operation. Accordingly, the entity is classified as joint ventures.[6]The effective percentage of ownership increased due to the disproportionate capital reduction of financial investors during the year ended December 31, 2022.[7]The joint arrangement which the Group has joint control is structured through a separate company. The parties have joint control over the joint arrangement are classified as joint ventures, judging that they have rights to the net assets of the arrangement.[8]The joint arrangement which the Company has joint control is structured through a separate company. The parties have joint control over the joint arrangement are classified as joint ventures, judging that they have rights to the net assets of the arrangement.[9]The effective percentage of ownership is less than 20%. However, decisions in relevant actitvities must be agreed by ownership parties. Accordingly, the entity is classified as joint ventures.[10]Although the nominal percentage of ownership is 29%, the effective percentage of ownership is 54.24%, considering the interest of financial investors as a liability component.[11]The effective percentage of ownership is more than 50%. However, decisions in relevant actitvities must be agreed by all ownership parties. Accordingly, the entity is classified as a joint venture.[12]The effective percentage of ownership is less than 20%. However, according to the shareholders’ agreement, decisions related pricipal operation must be agreed by all ownership parties. Accordingly, the Group can exercise significant influence.[13]The effective percentage of ownership is less than 20%. However, according to the shareholders’ agreement, decisions related pricipal operation must be agreed by all ownership parties. Accordingly, the Company can exercise significant influence.[14]According to the Dayone Energy Co., Ltd. Investment Agreement signed in March 2011, the Group has a commitment to guarantee principal and certain returns on shares of Dayone Energy Co., Ltd. held by NH Power 2nd Co., Ltd. and the National Agricultural Cooperative Federation. Since NH Power 2nd Co., Ltd. and the National Agricultural Cooperative Federation have put option regarding their share of the entity, the Group was deemed to have acquired an additional 15.64% stake. As a result, the effective percentage of ownership is 46.3% in the current and prior period. In accordance with shareholders’ agreement signed during the current period, the Group has joint control with other investors in making important financial and operation decisions, so it has been reclassified from an associate to a joint venture.[15]According to the Dayone Energy Co., Ltd. Investment Agreement signed in March 2011, the Company has a commitment to guarantee principal and certain returns on shares of Dayone Energy Co., Ltd. held by NH Power 2nd Co., Ltd. and the National Agricultural Cooperative Federation. Since NH Power 2nd Co., Ltd. and the National Agricultural Cooperative Federation have put option regarding their share of the entity, the Company was deemed to have acquired an additional 15.64% stake. As a result, the effective percentage of ownership is 46.3% in the current and prior period. In accordance with shareholders’ agreement signed during the current period, the Company has joint control with other investors in making important financial and operation decisions, so it has been reclassified from an associate to a joint venture.[16]After addtional acquisition of the shares, the effective percentage of ownership is more than 50%. However, decisions in relevant actitvities must be agreed by all members of the board of directors. Accordingly, the entity is classified as a joint venture.[17]The effective percentage of ownership is 37%, considering potential common stock.[18]The effective percentage of ownership is more than 50%. However, decisions in relevant actitvities must be agreed by all members of the board of directors. Accordingly, the entity is classified as a joint venture.[19]Due to the changes in the agreement, the Group lost its control over the entity. Accordingly, the entity is reclassified to a joint venture from a subsidiary. Although the effective percentage of ownership is more than 50%, decisions in relevant actitvities must be agreed by all members of the board of directors.

Investments in Joint Ventures (

Investments in Joint Ventures (Parenthetical) (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021
Disclosure of joint ventures [line items]
Acquisition cost		₩ 2,332,579		₩ 2,069,491
Waterbury Lake Uranium L.P.
Disclosure of joint ventures [line items]
Acquisition cost		26,602	[1]	26,602
Nawah Energy Company
Disclosure of joint ventures [line items]
Acquisition cost	[2]	₩ 296		₩ 296
PungBack Wind Farm Corporation
Disclosure of joint ventures [line items]
Effective percentage of ownership		37%
Acquisition cost	[3]	₩ 7,885
Trumbull Asset Management, LLC
Disclosure of joint ventures [line items]
Acquisition cost	[4]	0
Pyeongchang Wind Power Co., Ltd
Disclosure of joint ventures [line items]
Acquisition cost	[5]	9,329
Seobusambo highway photovoltaics Co., Ltd.
Disclosure of joint ventures [line items]
Acquisition cost	[6]	₩ 3,020
UD4M Co., Ltd.
Disclosure of joint ventures [line items]
Effective percentage of ownership		14.29%		12.50%
Percentage of ownership interest including holding in treasury stock		14.29%
Saemangeum Sebit Power Plant Co., Ltd. [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership		63.09%		69.55%
Environment and Energy Co., Ltd
Disclosure of joint ventures [line items]
Effective percentage of ownership		10.54%
Korea Gas Corporation
Disclosure of joint ventures [line items]
Effective percentage of ownership				20.47%
Acquisition cost		₩ 2,085,296		₩ 1,815,513
Korea Power Exchange [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership		100%		100%
Samcheok Eco Materials Co., Ltd. [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership		25.54%
Nominal percentage of ownership associate		2.35%
Dongducheon Dream Power [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership		34.01%		34.01%
Indeck Niles Development, LLC [Member]
Disclosure of joint ventures [line items]
Additional percentage of ownership associate				50%
Daegu Green Power Joint Ventures [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership		54.24%		54.24%
Nominal percentage of ownership associate		29%		29%
Saemangeum Solar Power Co., Ltd [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership				50%
Hyundai Energy [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership		46.30%		46.30%
Additional percentage of ownership associate		15.64%		15.64%
Bottom of range [member] | Pulau Indah O&M Sdn. Bhd
Disclosure of joint ventures [line items]
Effective percentage of ownership in joint venture		50%		50%
Bottom of range [member] | Trumbull Asset Management, LLC
Disclosure of joint ventures [line items]
Effective percentage of ownership in joint venture		50%
Bottom of range [member] | Pyeongchang Wind Power Co., Ltd
Disclosure of joint ventures [line items]
Effective percentage of ownership in joint venture		50%
Bottom of range [member] | Taebaek Guinemi Wind Power Co., Ltd
Disclosure of joint ventures [line items]
Effective percentage of ownership		50%
Bottom of range [member] | Seobusambo highway photovoltaics Co., Ltd.
Disclosure of joint ventures [line items]
Effective percentage of ownership in joint venture		50%
Bottom of range [member] | Saemangeum Sebit Power Plant Co., Ltd. [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership		50%
Bottom of range [member] | Gangwon Wind Power Co., Ltd. [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership				20%
Bottom of range [member] | KNOC Nigerian East Oil [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership				20%
Bottom of range [member] | Samcheok Eco Materials Co., Ltd. [Member]
Disclosure of joint ventures [line items]
Nominal percentage of ownership associate				2.35%
Bottom of range [member] | Korea Electric Power Corporation Fund [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership		50%
Bottom of range [member] | Namjeongsusang Solar Power Operation Co., Ltd. [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership				20%
Bottom of range [member] | Shuweihat Asia Operation & Maintenance Company [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership in joint venture		50%
Bottom of range [member] | Saemangeum Solar Power Co., Ltd [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership in joint venture		50%
Bottom of range [member] | SUNMEX RENOVABLES, S.A. DE C.V. [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership				20%
Bottom of range [member] | Nepal Water Energy Development Company Private Limited [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership		50%
Top of range [member] | Waterbury Lake Uranium L.P.
Disclosure of joint ventures [line items]
Effective percentage of ownership in joint venture		50%
Top of range [member] | Nawah Energy Company
Disclosure of joint ventures [line items]
Effective percentage of ownership		20%
Top of range [member] | UD4M Co., Ltd.
Disclosure of joint ventures [line items]
Effective percentage of ownership		20%
Top of range [member] | Environment and Energy Co., Ltd
Disclosure of joint ventures [line items]
Effective percentage of ownership		20%
Top of range [member] | Gangwon Wind Power Co., Ltd. [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership		20%
Top of range [member] | KNOC Nigerian East Oil [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership		20%
Top of range [member] | Samcheok Eco Materials Co., Ltd. [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership				25.54%
Top of range [member] | Korea Electric Power Corporation Fund [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership				50%
Top of range [member] | Namjeongsusang Solar Power Operation Co., Ltd. [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership		20%
Top of range [member] | Shuweihat Asia Operation & Maintenance Company [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership				50%
Top of range [member] | Saemangeum Solar Power Co., Ltd [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership				50%
Top of range [member] | SUNMEX RENOVABLES, S.A. DE C.V. [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership		20%
Top of range [member] | Nepal Water Energy Development Company Private Limited [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership				50%
Top of range [member] | Barakah One Company [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership		20%		20%
Top of range [member] | Yeomsubong Wind Power Co., Ltd
Disclosure of joint ventures [line items]
Effective percentage of ownership		20%
[1]The effective percentage of ownership is less than 50%. However, the entity is classified as a joint venture, because all consent was required to make decisions on related activities.[2]The effective percentage of ownership is less than 20%. However, decisions in relevant actitvities must be agreed by ownership parties. Accordingly, the entity is classified as joint ventures.[3]The effective percentage of ownership is 37%, considering potential common stock.[4]The effective percentage of ownership is more than 50%. However, decisions in relevant actitvities must be agreed by all members of the board of directors. Accordingly, the entity is classified as a joint venture.[5]After addtional acquisition of the shares, the effective percentage of ownership is more than 50%. However, decisions in relevant actitvities must be agreed by all members of the board of directors. Accordingly, the entity is classified as a joint venture.[6]Due to the changes in the agreement, the Group lost its control over the entity. Accordingly, the entity is reclassified to a joint venture from a subsidiary. Although the effective percentage of ownership is more than 50%, decisions in relevant actitvities must be agreed by all members of the board of directors.

Investments in Associates and_3

Investments in Associates and Joint Ventures - Additional Information (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Time Period One [Member] | Daegu Green Power Co., Ltd.
Disclosure Of Investments in Associates and Joint Ventures [Line Items]
Duration from the date of investment after which the rights to purchase the shares may be exercised	5 years
Time Period Two [Member] | Daegu Green Power Co., Ltd.
Disclosure Of Investments in Associates and Joint Ventures [Line Items]
Duration from the date of investment after which the rights to purchase the shares may be exercised	10 years
Time Period Three [Member] | Daegu Green Power Co., Ltd.
Disclosure Of Investments in Associates and Joint Ventures [Line Items]
Duration from the date of investment after which the rights to purchase the shares may be exercised	13 years
Korea Gas Corporation
Disclosure Of Investments in Associates and Joint Ventures [Line Items]
Post tax discount rate	5.20%	4.90%
Gemeng International Energy Co., Ltd. | Woori Spot PEF [Member]
Disclosure Of Investments in Associates and Joint Ventures [Line Items]
Put options as a percentage of shares	8%
Operating fees percentage	1%
Maturity date of the put options	Dec. 25, 2023

Property, Plant and Equipment -

Property, Plant and Equipment - Summary of Changes in Property, Plant and Equipment (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Changes in property and equipment [Line Items]
Beginning balance	₩ 173,134,638	₩ 168,710,600
Acquisitions	12,486,698	12,638,471
Disposals	(756,967)	(613,515)
Depreciation	(12,304,766)	(11,774,945)
Impairment	97,425	(4,056)
Others	5,208,280	4,178,083
Ending balance	177,865,308	173,134,638
Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	287,628,367
Ending balance	301,417,289	287,628,367
Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(113,125,414)
Ending balance	(122,280,663)	(113,125,414)
Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(866,906)
Ending balance	(756,064)	(866,906)
Government grants
Changes in property and equipment [Line Items]
Beginning balance	(501,409)
Ending balance	(515,254)	(501,409)
Land
Changes in property and equipment [Line Items]
Beginning balance	14,084,491
Ending balance	14,243,532	14,084,491
Land | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	14,107,965	13,943,326
Acquisitions	9,535	9,561
Disposals	(49,377)	(54,447)
Depreciation	0	0
Impairment	0	0
Others	202,814	209,525
Ending balance	14,270,937	14,107,965
Land | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	14,135,452
Ending balance	14,298,409	14,135,452
Land | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	0
Ending balance	0	0
Land | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(27,487)
Ending balance	(27,472)	(27,487)
Land | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(23,474)	(23,475)
Acquisitions	0	0
Disposals	1	1
Depreciation	0	0
Impairment	0	0
Others	(3,932)	0
Ending balance	(27,405)	(23,474)
Buildings
Changes in property and equipment [Line Items]
Beginning balance	12,874,104
Ending balance	13,241,763	12,874,104
Buildings | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	12,926,226	12,616,532
Acquisitions	3,202	9,036
Disposals	(19,918)	(19,974)
Depreciation	(906,528)	(889,539)
Impairment	(449)	0
Others	1,289,667	1,210,171
Ending balance	13,292,200	12,926,226
Buildings | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	22,974,569
Ending balance	24,230,827	22,974,569
Buildings | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(10,041,270)
Ending balance	(10,931,672)	(10,041,270)
Buildings | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(7,073)
Ending balance	(6,955)	(7,073)
Buildings | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(52,122)	(57,231)
Acquisitions	0	0
Disposals	0	0
Depreciation	5,360	5,174
Impairment	0	0
Others	(3,675)	(65)
Ending balance	(50,437)	(52,122)
Structures
Changes in property and equipment [Line Items]
Beginning balance	48,118,031
Ending balance	50,283,627	48,118,031
Structures | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	48,290,052	46,258,855
Acquisitions	217,450	630
Disposals	(277,308)	(319,287)
Depreciation	(2,677,395)	(2,582,488)
Impairment	(3,669)	(741)
Others	4,900,105	4,933,083
Ending balance	50,449,235	48,290,052
Structures | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	78,474,620
Ending balance	83,055,890	78,474,620
Structures | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(30,171,363)
Ending balance	(32,596,265)	(30,171,363)
Structures | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(13,205)
Ending balance	(10,390)	(13,205)
Structures | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(172,021)	(180,009)
Acquisitions	0	0
Disposals	1,250	1,811
Depreciation	9,568	9,517
Impairment	0	0
Others	(4,405)	(3,340)
Ending balance	(165,608)	(172,021)
Machinery
Changes in property and equipment [Line Items]
Beginning balance	51,615,300
Ending balance	54,064,659	51,615,300
Machinery | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	51,755,382	50,038,787
Acquisitions	248,932	268,126
Disposals	(188,924)	(135,803)
Depreciation	(5,748,407)	(5,759,425)
Impairment	(33,191)	0
Others	8,157,993	7,343,697
Ending balance	54,191,785	51,755,382
Machinery | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	101,062,220
Ending balance	108,749,243	101,062,220
Machinery | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(48,791,847)
Ending balance	(54,015,594)	(48,791,847)
Machinery | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(514,991)
Ending balance	(541,864)	(514,991)
Machinery | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(140,082)	(157,785)
Acquisitions	0	0
Disposals	405	531
Depreciation	17,283	17,519
Impairment	0	0
Others	(4,732)	(347)
Ending balance	(127,126)	(140,082)
Ships
Changes in property and equipment [Line Items]
Beginning balance	177
Ending balance	13,476	177
Ships | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	177	255
Acquisitions	0	0
Disposals	0	0
Depreciation	(1,053)	(103)
Impairment	0	0
Others	14,352	25
Ending balance	13,476	177
Ships | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	2,068
Ending balance	17,264	2,068
Ships | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(1,891)
Ending balance	(3,788)	(1,891)
Ships | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	0
Ending balance	0	0
Ships | Government grants
Changes in property and equipment [Line Items]
Beginning balance	0
Ending balance	0	0
Vehicles
Changes in property and equipment [Line Items]
Beginning balance	87,582
Ending balance	85,642	87,582
Vehicles | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	89,257	78,983
Acquisitions	1,813	4,807
Disposals	(88)	(4,298)
Depreciation	(41,907)	(37,980)
Impairment	0	0
Others	38,612	47,745
Ending balance	87,687	89,257
Vehicles | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	371,207
Ending balance	393,046	371,207
Vehicles | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(281,833)
Ending balance	(305,242)	(281,833)
Vehicles | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(117)
Ending balance	(117)	(117)
Vehicles | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(1,675)	(632)
Acquisitions	0	(26)
Disposals	0	0
Depreciation	663	460
Impairment	0	0
Others	(1,033)	(1,477)
Ending balance	(2,045)	(1,675)
Equipment
Changes in property and equipment [Line Items]
Beginning balance	397,034
Ending balance	429,133	397,034
Equipment | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	397,183	407,843
Acquisitions	79,369	54,875
Disposals	(183)	(667)
Depreciation	(205,908)	(184,007)
Impairment	(1)	0
Others	165,281	119,139
Ending balance	435,741	397,183
Equipment | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	1,989,115
Ending balance	2,168,348	1,989,115
Equipment | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(1,591,890)
Ending balance	(1,732,564)	(1,591,890)
Equipment | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(42)
Ending balance	(43)	(42)
Equipment | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(149)	(227)
Acquisitions	0	0
Disposals	0	0
Depreciation	494	95
Impairment	0	0
Others	(6,953)	(17)
Ending balance	(6,608)	(149)
Tools
Changes in property and equipment [Line Items]
Beginning balance	183,001
Ending balance	178,402	183,001
Tools | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	183,065	192,387
Acquisitions	25,291	19,389
Disposals	(180)	(89)
Depreciation	(77,902)	(81,984)
Impairment	0	0
Others	48,227	53,362
Ending balance	178,501	183,065
Tools | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	1,256,189
Ending balance	1,306,509	1,256,189
Tools | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(1,073,086)
Ending balance	(1,128,002)	(1,073,086)
Tools | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(38)
Ending balance	(6)	(38)
Tools | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(64)	(239)
Acquisitions	0	0
Disposals	0	0
Depreciation	32	209
Impairment	0	0
Others	(67)	(34)
Ending balance	(99)	(64)
Construction in progress
Changes in property and equipment [Line Items]
Beginning balance	30,044,272
Ending balance	27,905,545	30,044,272
Construction in progress | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	30,156,094	30,964,938
Acquisitions	11,671,907	12,183,430
Disposals	(197,293)	(66,965)
Depreciation	0	0
Impairment	134,735	(3,315)
Others	(13,723,972)	(12,921,994)
Ending balance	28,041,471	30,156,094
Construction in progress | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	30,313,624
Ending balance	28,064,266	30,313,624
Construction in progress | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	0
Ending balance	0	0
Construction in progress | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(157,530)
Ending balance	(22,795)	(157,530)
Construction in progress | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(111,822)	(79,126)
Acquisitions	23,155	5,027
Disposals	17	0
Depreciation	0	0
Impairment	0	0
Others	(47,276)	(37,723)
Ending balance	(135,926)	(111,822)
Right-of-use assets
Changes in property and equipment [Line Items]
Beginning balance	4,059,397
Ending balance	3,711,125	4,059,397
Right-of-use assets | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	4,059,397	4,542,166
Acquisitions	197,016	78,213
Disposals	(2,838)	(11,787)
Depreciation	(509,068)	(558,565)
Impairment	0	0
Others	(33,382)	9,370
Ending balance	3,711,125	4,059,397
Right-of-use assets | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	7,848,138
Ending balance	5,992,724	7,848,138
Right-of-use assets | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(3,788,741)
Ending balance	(2,281,599)	(3,788,741)
Right-of-use assets | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	0
Ending balance	0	0
Right-of-use assets | Government grants
Changes in property and equipment [Line Items]
Beginning balance	0
Ending balance	0	0
Retirements, property, plant and equipment
Changes in property and equipment [Line Items]
Beginning balance	8,925,388
Ending balance	11,288,967	8,925,388
Retirements, property, plant and equipment | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	8,925,388	7,413,171
Acquisitions	0	92
Disposals	0	(209)
Depreciation	(1,133,866)	(844,518)
Impairment	0	0
Others	3,497,445	2,356,852
Ending balance	11,288,967	8,925,388
Retirements, property, plant and equipment | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	14,348,920
Ending balance	17,620,603	14,348,920
Retirements, property, plant and equipment | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(5,277,109)
Ending balance	(6,185,214)	(5,277,109)
Retirements, property, plant and equipment | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(146,423)
Ending balance	(146,422)	(146,423)
Retirements, property, plant and equipment | Government grants
Changes in property and equipment [Line Items]
Beginning balance	0
Ending balance	0	0
Other property, plant and equipment
Changes in property and equipment [Line Items]
Beginning balance	2,745,861
Ending balance	2,419,437	2,745,861
Other property, plant and equipment | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	2,745,861	2,752,081
Acquisitions	9,028	5,311
Disposals	(22,531)	(2,332)
Depreciation	(1,036,132)	(869,310)
Impairment	0	0
Others	723,211	860,111
Ending balance	2,419,437	2,745,861
Other property, plant and equipment | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	14,852,245
Ending balance	15,520,160	14,852,245
Other property, plant and equipment | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(12,106,384)
Ending balance	(13,100,723)	(12,106,384)
Other property, plant and equipment | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	0
Ending balance	0	0
Other property, plant and equipment | Government grants
Changes in property and equipment [Line Items]
Beginning balance	0
Ending balance	₩ 0	₩ 0

Property, Plant and Equipment_2

Property, Plant and Equipment - Summary of Changes in Preperty, Plant and Equipment (Details) (Parenthetical) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of detailed information about property, plant and equipment [line items]
Revenue	₩ 70,546,024	₩ 60,012,375	₩ 57,926,634
Cost of sales	100,903,594	₩ 63,644,290	₩ 51,804,179
Property, Plant and Equipment-Proceeds before Intended Use [member]
Disclosure of detailed information about property, plant and equipment [line items]
Revenue	94,264
Property Plant and Equipment Costs Before Intended Use [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Cost of sales	₩ 63,405

Investment Properties - Summary

Investment Properties - Summary of Investment Properties and Changes in Investment Properties (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disclosure of detailed information about investment property [line items]
Beginning balance	₩ 212,784	₩ 225,195
Depreciation	(486)	(1,386)
Others	(3,804)	(11,025)
Disposal	(208)
Endings balance	208,286	212,784
Acquisition cost
Disclosure of detailed information about investment property [line items]
Beginning balance	221,148
Endings balance	214,658	221,148
Accumulated depreciation
Disclosure of detailed information about investment property [line items]
Beginning balance	(8,334)
Endings balance	(6,351)	(8,334)
Government grants
Disclosure of detailed information about investment property [line items]
Beginning balance	(30)	(29)
Depreciation	1	1
Others	8	(2)
Disposal	0
Endings balance	(21)	(30)
Investment property - Land
Disclosure of detailed information about investment property [line items]
Beginning balance	201,605
Disposal	(208)
Endings balance	194,417	201,605
Investment property - Land | Carrying Amount Other than Government Grants
Disclosure of detailed information about investment property [line items]
Beginning balance	201,605	200,391
Depreciation	0	0
Others	(6,980)	1,214
Endings balance	194,417	201,605
Investment property - Land | Acquisition cost
Disclosure of detailed information about investment property [line items]
Beginning balance	201,605
Endings balance	194,417	201,605
Investment property - Land | Accumulated depreciation
Disclosure of detailed information about investment property [line items]
Beginning balance	0
Endings balance	0	0
Investment property - Land | Government grants
Disclosure of detailed information about investment property [line items]
Beginning balance	0
Endings balance	0	0
Investment property - Buildings
Disclosure of detailed information about investment property [line items]
Beginning balance	11,179
Endings balance	13,869	11,179
Investment property - Buildings | Carrying Amount Other than Government Grants
Disclosure of detailed information about investment property [line items]
Beginning balance	11,209	24,833
Depreciation	(487)	(1,387)
Others	3,168	(12,237)
Disposal	0
Endings balance	13,890	11,209
Investment property - Buildings | Acquisition cost
Disclosure of detailed information about investment property [line items]
Beginning balance	19,543
Endings balance	20,241	19,543
Investment property - Buildings | Accumulated depreciation
Disclosure of detailed information about investment property [line items]
Beginning balance	(8,334)
Endings balance	(6,351)	(8,334)
Investment property - Buildings | Government grants
Disclosure of detailed information about investment property [line items]
Beginning balance	(30)
Endings balance	₩ (21)	₩ (30)

Investment Properties - Summa_2

Investment Properties - Summary of Income and Expenses Related to Investment Properties (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Rental income from investment property, net of direct operating expense [abstract]
Rental income	₩ 9,775	₩ 10,118
Operating and maintenance expenses related to rental income	(587)	(1,386)
Rental income from investment property, net of direct operating expense	₩ 9,188	₩ 8,732

Investment Properties - Summa_3

Investment Properties - Summary of Fair Value of Investment Properties (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure The fair value of investment property [Line Items]
Fair value of Investment property	₩ 308,453	₩ 282,338
Carrying amount of Investment property	208,286	212,784	₩ 225,195
Land
Disclosure The fair value of investment property [Line Items]
Fair value of Investment property	292,827	268,702
Carrying amount of Investment property	194,417	201,605
Buildings
Disclosure The fair value of investment property [Line Items]
Fair value of Investment property	15,626	13,636
Carrying amount of Investment property	₩ 13,869	₩ 11,179

Construction Contracts - Summar

Construction Contracts - Summary of Changes in Total Contract Amount in Which Revenue is Not Yet Recognized (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Construction Services Contracts [Abstract]
Beginning balance	₩ 2,783,935	₩ 3,152,725	₩ 2,735,141
Increase and decrease
New orders and foreign exchange impact	3,578,599	458,635	1,512,460
Changes in scope of construction work	81,401	72,427	282,701
Increase (decrease) in Construction contracts from new orders and foreign exchange	3,457,964	386,208	1,229,759
Recognized as revenue	(646,953)	(754,998)	(812,175)
Ending balance	₩ 5,594,946	₩ 2,783,935	₩ 3,152,725

Construction Contracts - Summ_2

Construction Contracts - Summary of Gross Amount of Assets and Liabilities for Contract and Accumulated Earned Revenue, Expense and Others (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2022	Dec. 31, 2021
Accumulated earned revenue, expense and others
Accumulated earned revenue		₩ 22,507,004	₩ 22,051,129
Accumulated expense		21,666,552	20,967,097
Accumulated profit		840,452	1,084,032
Unearned advance receipts		29,877	23,238
Construction Contract Assets and Liabilities [Abstract]
Assets	[1]	118,983	82,306
Liabilities	[2]	₩ 120,952	₩ 5,330
[1]Included in trade and other receivables, net, in the consolidated statements of financial position. The balance of trade receivables from construction contracts are ￦57,639 million and ￦85,757 million, as of December 31, 2021 and 2022, respectively.[2]Included in non-financial liabilities as advance received in the consolidated statements of financial position. The revenue recognized on December 31, 2022 from the amounts included in contract liabilities at the end of the prior year is ￦5,051 million.

Construction Contracts - Additi

Construction Contracts - Additional Information (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Accumulated Earned Revenue Expense And Others [Line Items]
Revenue that was included in contract liability balance at beginning of period	₩ 711,839	₩ 661,212
Construction Contracts [Member]
Accumulated Earned Revenue Expense And Others [Line Items]
Revenue that was included in contract liability balance at beginning of period	5,051
Revenue from performance obligations satisfied or partially satisfied in previous periods	15,663
Receivables from contracts with customers	₩ 85,757	₩ 57,639

Intangible Assets other than _3

Intangible Assets other than Goodwill - Summary of Intangible Asset Explanatory and Changes in intangible assets (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	₩ 1,044,077
Changes in intangible assets other than goodwill
Reversal	0	₩ (14)	₩ 0
Impairment	(164)	0	(3,599)
Ending balance	956,664	1,044,077
Intangible assets other than goodwill
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	1,044,077	1,055,730
Changes in intangible assets other than goodwill
Acquisition	126,295	152,639
Disposal	(354)	(132)
Amortization	(156,160)	(166,161)
Reversal		14
Impairment	(164)
Others	(57,030)	1,987
Ending balance	956,664	1,044,077	1,055,730
Intangible assets other than goodwill | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	3,940,927
Changes in intangible assets other than goodwill
Ending balance	3,963,439	3,940,927
Intangible assets other than goodwill | Accumulated amortization
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(2,310,088)
Changes in intangible assets other than goodwill
Ending balance	(2,429,624)	(2,310,088)
Intangible assets other than goodwill | Accumulated impairment [member]
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(575,454)
Changes in intangible assets other than goodwill
Ending balance	(571,325)	(575,454)
Intangible assets other than goodwill | Government grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(11,308)
Changes in intangible assets other than goodwill
Ending balance	(5,826)	(11,308)
Software
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	162,505
Changes in intangible assets other than goodwill
Ending balance	202,833	162,505
Software | Carrying Amount Other than Government Grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	162,596	152,163
Changes in intangible assets other than goodwill
Acquisition	22,532	18,834
Disposal	(57)	(1)
Amortization	(84,649)	(77,881)
Reversal		0
Impairment	0
Others	102,585	69,481
Ending balance	203,007	162,596	152,163
Software | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	867,185
Changes in intangible assets other than goodwill
Ending balance	1,002,040	867,185
Software | Accumulated amortization
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(704,589)
Changes in intangible assets other than goodwill
Ending balance	(799,013)	(704,589)
Software | Accumulated impairment [member]
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	0
Changes in intangible assets other than goodwill
Ending balance	(20)	0
Software | Government grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(91)	(136)
Changes in intangible assets other than goodwill
Acquisition	0	0
Disposal	0	0
Amortization	60	64
Reversal		0
Impairment	0
Others	(143)	(19)
Ending balance	(174)	(91)	(136)
Copyrights, patents rights and other industrial rights
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	35,187
Changes in intangible assets other than goodwill
Ending balance	28,013	35,187
Copyrights, patents rights and other industrial rights | Carrying Amount Other than Government Grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	35,187	42,916
Changes in intangible assets other than goodwill
Acquisition	270	166
Disposal	(37)	(131)
Amortization	(7,136)	(7,771)
Reversal		0
Impairment	0
Others	(271)	7
Ending balance	28,013	35,187	42,916
Copyrights, patents rights and other industrial rights | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	103,428
Changes in intangible assets other than goodwill
Ending balance	104,559	103,428
Copyrights, patents rights and other industrial rights | Accumulated amortization
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(59,063)
Changes in intangible assets other than goodwill
Ending balance	(67,368)	(59,063)
Copyrights, patents rights and other industrial rights | Accumulated impairment [member]
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(9,178)
Changes in intangible assets other than goodwill
Ending balance	(9,178)	(9,178)
Copyrights, patents rights and other industrial rights | Government grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	0
Changes in intangible assets other than goodwill
Ending balance	0	0
Mining rights
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	41,902
Changes in intangible assets other than goodwill
Ending balance	38,525	41,902
Mining rights | Carrying Amount Other than Government Grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	41,902	42,390
Changes in intangible assets other than goodwill
Acquisition	2,395	1,022
Disposal	0	0
Amortization	(4,296)	(3,526)
Reversal		0
Impairment	0
Others	(1,476)	2,016
Ending balance	38,525	41,902	42,390
Mining rights | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	623,122
Changes in intangible assets other than goodwill
Ending balance	625,845	623,122
Mining rights | Accumulated amortization
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(39,803)
Changes in intangible assets other than goodwill
Ending balance	(46,187)	(39,803)
Mining rights | Accumulated impairment [member]
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(541,417)
Changes in intangible assets other than goodwill
Ending balance	(541,133)	(541,417)
Mining rights | Government grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	0
Changes in intangible assets other than goodwill
Ending balance	0	0
Development expenditures
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	69,124
Changes in intangible assets other than goodwill
Ending balance	51,028	69,124
Development expenditures | Carrying Amount Other than Government Grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	72,944	95,166
Changes in intangible assets other than goodwill
Acquisition	0	309
Disposal	0	0
Amortization	(24,238)	(37,033)
Reversal		0
Impairment	0
Others	5,799	14,502
Ending balance	54,505	72,944	95,166
Development expenditures | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	978,768
Changes in intangible assets other than goodwill
Ending balance	938,032	978,768
Development expenditures | Accumulated amortization
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(905,805)
Changes in intangible assets other than goodwill
Ending balance	(883,527)	(905,805)
Development expenditures | Accumulated impairment [member]
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(19)
Changes in intangible assets other than goodwill
Ending balance	0	(19)
Development expenditures | Government grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(3,820)	(5,043)
Changes in intangible assets other than goodwill
Acquisition	0	0
Disposal	0	0
Amortization	1,466	1,439
Reversal		0
Impairment	0
Others	(1,123)	(216)
Ending balance	(3,477)	(3,820)	(5,043)
Intangible assets under development
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	74,104
Changes in intangible assets other than goodwill
Ending balance	65,614	74,104
Intangible assets under development | Carrying Amount Other than Government Grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	81,430	67,018
Changes in intangible assets other than goodwill
Acquisition	39,559	51,988
Disposal	0	0
Amortization	0	0
Reversal		0
Impairment	(14)
Others	(53,253)	(37,576)
Ending balance	67,722	81,430	67,018
Intangible assets under development | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	94,275
Changes in intangible assets other than goodwill
Ending balance	76,625	94,275
Intangible assets under development | Accumulated amortization
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	0
Changes in intangible assets other than goodwill
Ending balance	0	0
Intangible assets under development | Accumulated impairment [member]
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(12,845)
Changes in intangible assets other than goodwill
Ending balance	(8,903)	(12,845)
Intangible assets under development | Government grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(7,326)	(7,203)
Changes in intangible assets other than goodwill
Acquisition	0	0
Disposal	0	0
Amortization	0	0
Reversal		0
Impairment	0
Others	5,218	(123)
Ending balance	(2,108)	(7,326)	(7,203)
Usage rights of donated assets and other
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	169,783
Changes in intangible assets other than goodwill
Ending balance	157,143	169,783
Usage rights of donated assets and other | Carrying Amount Other than Government Grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	169,783	184,475
Changes in intangible assets other than goodwill
Acquisition	0	0
Disposal	0	0
Amortization	(11,394)	(13,594)
Reversal		0
Impairment	(150)
Others	(1,096)	(1,098)
Ending balance	157,143	169,783	184,475
Usage rights of donated assets and other | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	592,870
Changes in intangible assets other than goodwill
Ending balance	592,797	592,870
Usage rights of donated assets and other | Accumulated amortization
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(423,087)
Changes in intangible assets other than goodwill
Ending balance	(435,518)	(423,087)
Usage rights of donated assets and other | Accumulated impairment [member]
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	0
Changes in intangible assets other than goodwill
Ending balance	(136)	0
Usage rights of donated assets and other | Government grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	0
Changes in intangible assets other than goodwill
Ending balance	0	0
Leasehold rights
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	5,848
Changes in intangible assets other than goodwill
Ending balance	4,888	5,848
Leasehold rights | Carrying Amount Other than Government Grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	5,848	6,340
Changes in intangible assets other than goodwill
Acquisition	0	0
Disposal	0	0
Amortization	(960)	(834)
Reversal		0
Impairment	0
Others	0	342
Ending balance	4,888	5,848	6,340
Leasehold rights | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	28,185
Changes in intangible assets other than goodwill
Ending balance	28,185	28,185
Leasehold rights | Accumulated amortization
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(22,337)
Changes in intangible assets other than goodwill
Ending balance	(23,297)	(22,337)
Leasehold rights | Accumulated impairment [member]
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	0
Changes in intangible assets other than goodwill
Ending balance	0	0
Leasehold rights | Government grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	0
Changes in intangible assets other than goodwill
Ending balance	0	0
Greenhouse gas emissions rights
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	78,137
Changes in intangible assets other than goodwill
Ending balance	43,960	78,137
Greenhouse gas emissions rights | Carrying Amount Other than Government Grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	78,137	61,373
Changes in intangible assets other than goodwill
Acquisition	57,466	78,091
Disposal	0	0
Amortization	0	(31)
Reversal		0
Impairment	0
Others	(91,643)	(61,296)
Ending balance	43,960	78,137	61,373
Greenhouse gas emissions rights | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	78,137
Changes in intangible assets other than goodwill
Ending balance	43,960	78,137
Greenhouse gas emissions rights | Accumulated amortization
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	0
Changes in intangible assets other than goodwill
Ending balance	0	0
Greenhouse gas emissions rights | Accumulated impairment [member]
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	0
Changes in intangible assets other than goodwill
Ending balance	0	0
Greenhouse gas emissions rights | Government grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	0
Changes in intangible assets other than goodwill
Ending balance	0	0
Others
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	407,487
Changes in intangible assets other than goodwill
Ending balance	364,660	407,487
Others | Carrying Amount Other than Government Grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	407,558	416,346
Changes in intangible assets other than goodwill
Acquisition	4,073	2,229
Disposal	(260)	0
Amortization	(25,017)	(26,998)
Reversal		14
Impairment	0
Others	(21,627)	15,967
Ending balance	364,727	407,558	416,346
Others | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	574,957
Changes in intangible assets other than goodwill
Ending balance	551,396	574,957
Others | Accumulated amortization
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(155,404)
Changes in intangible assets other than goodwill
Ending balance	(174,714)	(155,404)
Others | Accumulated impairment [member]
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(11,995)
Changes in intangible assets other than goodwill
Ending balance	(11,955)	(11,995)
Others | Government grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(71)	(75)
Changes in intangible assets other than goodwill
Acquisition	0	0
Disposal	0	0
Amortization	4	4
Reversal		0
Impairment	0
Others	0	0
Ending balance	₩ (67)	₩ (71)	₩ (75)

Intangible Assets other than _4

Intangible Assets other than Goodwill - Summary of Significant Specific Intangible Assets (Details) ₩ in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2022 KRW (₩)	Dec. 31, 2021 KRW (₩)	Dec. 31, 2022 AUD ($)	Dec. 31, 2021 AUD ($)
Software | DAS MSSQL CORE license [Member]
Disclosure of intangible assets material to entity [line items]
Carrying value			₩ 3,817
Remaining amortisation period of intangible assets material to entity			2 years and 8 months
Software | ORACLE license for SDIS integrated DB
Disclosure of intangible assets material to entity [line items]
Carrying value		₩ 5,509
Remaining amortisation period of intangible assets material to entity		3 years and 4 months
Copyrights, patents rights and other industrial rights | Smart technology verification and standard design project conducting right
Disclosure of intangible assets material to entity [line items]
Carrying value			₩ 1,851
Remaining amortisation period of intangible assets material to entity			9 months
Copyrights, patents rights and other industrial rights | Contributions to APR NRC DC
Disclosure of intangible assets material to entity [line items]
Carrying value		₩ 20,871	₩ 25,045
Remaining amortisation period of intangible assets material to entity		5 years	6 years
Mining rights | Mining right of Bylong mine
Disclosure of intangible assets material to entity [line items]
Carrying value | $				$ 0	$ 0
Remaining amortisation period of intangible assets material to entity	[1]	The carrying amount of mining rights is nil, because KEPCO Australia Pty., Ltd. and KEPCO Bylong Australia Pty., Ltd. had recognized impairment losses in full	The carrying amount of mining rights is nil, because KEPCO Australia Pty., Ltd. and KEPCO Bylong Australia Pty., Ltd. had recognized impairment losses in full.
Usage rights of donated assets and other | Right of use electricity and gas supply facility (Community district of Songdo)
Disclosure of intangible assets material to entity [line items]
Carrying value		₩ 7,908	₩ 8,962
Remaining amortisation period of intangible assets material to entity		7 years and 6 months	8 years and 6 months
Usage rights of donated assets and other | Sejong Haengbogdosi sharing charge
Disclosure of intangible assets material to entity [line items]
Carrying value		₩ 17,772	₩ 22,310
Remaining amortisation period of intangible assets material to entity		3 years and 11 months	4 years and 11 months
Others | Occupancy and use of public waters
Disclosure of intangible assets material to entity [line items]
Carrying value		₩ 76,212	₩ 81,623
Remaining amortisation period of intangible assets material to entity		14 years and 1 month	15 years and 1 month
Others | Greenhouse gas emissions rights
Disclosure of intangible assets material to entity [line items]
Carrying value		₩ 43,960	₩ 78,137
Remaining amortisation period of intangible assets material to entity		0	0
Others | Business rights
Disclosure of intangible assets material to entity [line items]
Carrying value		₩ 154,712	₩ 160,459
Remaining amortisation period of intangible assets material to entity		26 years and 11 months	27 years and 11 months
[1]The carrying amount of mining rights is nil, because KEPCO Australia Pty., Ltd. and KEPCO Bylong Australia Pty., Ltd. had recognized impairment losses in full.

Intangible Assets other than _5

Intangible Assets other than Goodwill - Additional Information (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Research And Development Expense [Abstract]
Research and development expense	₩ 727,810	₩ 689,397	₩ 700,642

Trade and Other Payables - Summ

Trade and Other Payables - Summary of Trade and Other Payables Explanatory (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Trade and other payables [Line Items]
Lease liabilities	₩ 4,163,143	₩ 4,410,503	₩ 4,621,096
Current trade and other payables
Trade and other payables [Line Items]
Trade payables	7,529,857	4,780,260
Non trade payables	2,132,838	1,536,976
Accrued expenses	1,605,118	1,174,765
Leasehold deposits received	2,479	1,699
Other deposits received	97,408	72,063
Lease liabilities	614,037	583,558
Dividends payable	1,812	4,105
Trade and other payables Others
Advance received from local governments	0	0
Others	0	0
Others	0	0
Total trade and other payables	11,983,549	8,153,426
Non-current trade and other payables
Trade and other payables [Line Items]
Trade payables	0	0
Non trade payables	2,023,985	2,032,260
Accrued expenses	6,351	8,095
Leasehold deposits received	35	741
Other deposits received	47,863	68,050
Lease liabilities	3,549,106	3,826,945
Dividends payable	0	0
Trade and other payables Others
Advance received from local governments	3,477	3,477
Others	8,097	56,930
Others	11,574	60,407
Total trade and other payables	₩ 5,638,914	₩ 5,996,498

Borrowings and Debt Securitie_2

Borrowings and Debt Securities - Summary of Borrowings And Debt Securities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Current Borrowings and Debt Securities
Short-term borrowings	₩ 8,820,425	₩ 2,920,563
Current portion of long-term borrowings	3,638,202	1,463,703
Current portion of debt securities	10,205,395	9,652,986
Less : Current portion of discount on long-term borrowings	(774)	(2,048)
Less : Current portion of discount on debt securities	(4,246)	(5,370)
Current Borrowings and Debt Securities	22,659,002	14,029,834
Non-current Borrowings and Debt Securities
Long-term borrowings	2,977,268	2,278,481
Debt securities	95,160,920	64,385,784
Less : Discount on long-term borrowings	(14,945)	(12,857)
Less : Discount on debt securities	(177,543)	(152,760)
Add : Premium on debt securities	663	1,031
Non-current Borrowings and Debt Securities	97,946,363	66,499,679
Total	₩ 120,605,365	₩ 80,529,513

Borrowings and Debt Securitie_3

Borrowings and Debt Securities - Repayment Schedule of Borrowings and Debt Securities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Repayment schedule of borrowings and debt securities [Line Items]
Borrowings	₩ 15,435,895	₩ 6,662,747
Debt Securities	105,366,315	74,038,770
Less than 1 year
Repayment schedule of borrowings and debt securities [Line Items]
Borrowings	12,458,627	4,384,266
Debt Securities	10,205,395	9,652,986
1~5 Years
Repayment schedule of borrowings and debt securities [Line Items]
Borrowings	1,472,655	1,013,500
Debt Securities	65,278,587	34,156,038
Over 5 Years
Repayment schedule of borrowings and debt securities [Line Items]
Borrowings	1,504,613	1,264,981
Debt Securities	₩ 29,882,333	₩ 30,229,746

Borrowings and Debt Securitie_4

Borrowings and Debt Securities - Short-term Borrowings (Details) € in Thousands, $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2022 KRW (₩)	Dec. 31, 2021 KRW (₩)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 EUR (€)
Disclosure of detailed information about Short-term borrowings [Line Items]
Short-term borrowings	₩ 8,820,425	₩ 2,920,563
Local short-term borrowings
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor	DB financial investment and others	DB financial investment and others
Short-term borrowings	₩ 5,549,120	₩ 2,030,886	$ 0	$ 0
Local short-term borrowings | Minimum
Disclosure of detailed information about Short-term borrowings [Line Items]
Borrowings, interest rate	3.21%	1.96%	3.21%	1.96%	1.96%
Borrowings, maturity	2023.01.02	2022.01.07
Local short-term borrowings | Maximum
Disclosure of detailed information about Short-term borrowings [Line Items]
Borrowings, interest rate	5.80%	4.60%	5.80%	4.60%	4.60%
Borrowings, maturity	2023.12.31	2022.12.31
Foreign short-term borrowings
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor	Shinhan Bank	Shinhan Bank and others
Borrowings, interest rate	5.19%		5.19%
Borrowings, maturity	2023.02.28
Short-term borrowings	₩ 15,264	₩ 186,755	$ 12,045	$ 157,533
Foreign short-term borrowings | Minimum
Disclosure of detailed information about Short-term borrowings [Line Items]
Borrowings, interest rate		0.34%		0.34%	0.34%
Borrowings, maturity		2022.01.04
Foreign short-term borrowings | Maximum
Disclosure of detailed information about Short-term borrowings [Line Items]
Borrowings, interest rate		0.45%		0.45%	0.45%
Borrowings, maturity		2022.03.30
Foreign short-term borrowings
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor	Shinhan Bank	Korea Development Bank and others
Borrowings, interest rate basis	SOFR(1M) + 0.65	1M Libor + 1.25
Borrowings, maturity	2023.02.27	2022.04.29
Short-term borrowings	₩ 50,692	₩ 205,142	40,000	$ 173,042
Foreign short-term borrowings
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor	Kookmin Bank and others	Shinhan Bank and others
Short-term borrowings	₩ 116,333	₩ 92,847	$ 91,796	$ 78,319
Foreign short-term borrowings | Minimum
Disclosure of detailed information about Short-term borrowings [Line Items]
Borrowings, interest rate	3.32%	0.57%	3.32%	0.57%	0.57%
Borrowings, maturity	2023.01.09	2022.06.17
Foreign short-term borrowings | Maximum
Disclosure of detailed information about Short-term borrowings [Line Items]
Borrowings, interest rate	5.88%	0.80%	5.88%	0.80%	0.80%
Borrowings, maturity	2023.06.12	2022.08.31
Local bank overdraft
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor	Woori Bank and others	Korea Development Bank and others
Borrowings, interest rate basis	Standard overdraft rate + 1.32 4.83
Short-term borrowings	₩ 35,616	₩ 208,018	$ 0	$ 0
Local bank overdraft | Minimum
Disclosure of detailed information about Short-term borrowings [Line Items]
Borrowings, interest rate		1.73%		1.73%	1.73%
Borrowings, adjustment to interest rate basis	1.32%		1.32%
Borrowings, maturity	2023.01.06	2022.01.07
Local bank overdraft | Maximum
Disclosure of detailed information about Short-term borrowings [Line Items]
Borrowings, interest rate		2.25%		2.25%	2.25%
Borrowings, adjustment to interest rate basis	4.83%		4.83%
Borrowings, maturity	2023.02.24	2022.02.26
Electronic short-term bonds
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor		BNK Securities and others
Short-term borrowings		₩ 100,000		$ 0
Electronic short-term bonds | Minimum
Disclosure of detailed information about Short-term borrowings [Line Items]
Borrowings, interest rate		1.35%		1.35%	1.35%
Borrowings, maturity		2022.01.21
Electronic short-term bonds | Maximum
Disclosure of detailed information about Short-term borrowings [Line Items]
Borrowings, interest rate		1.77%		1.77%	1.77%
Borrowings, maturity		2022.02.08
Foreign short-term borrowings
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor		Credit Agricole and others
Borrowings, interest rate		0.04%		0.04%	0.04%
Borrowings, maturity		2022.06.28
Short-term borrowings		₩ 96,915			€ 72,199
Local short-term borrowings
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor	Nonghyup Bank and others
Borrowings, interest rate basis	3M CD + 1.11~1.70
Short-term borrowings	₩ 3,000,000		$ 0
Local short-term borrowings | Minimum
Disclosure of detailed information about Short-term borrowings [Line Items]
Borrowings, adjustment to interest rate basis	1.11%		1.11%
Borrowings, maturity	2023.05.25
Local short-term borrowings | Maximum
Disclosure of detailed information about Short-term borrowings [Line Items]
Borrowings, adjustment to interest rate basis	1.70%		1.70%
Borrowings, maturity	2023.11.24
Local short-term borrowings
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor	Shinhan Bank
Borrowings, interest rate basis	6M Bank Debenture Rate + 1.77
Borrowings, adjustment to interest rate basis	1.77%		1.77%
Borrowings, maturity	2023.11.17
Short-term borrowings	₩ 50,000		$ 0
Local short-term borrowings
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor	Korea Development Bank
Borrowings, interest rate	4.15%		4.15%
Borrowings, maturity	2023.01.06
Short-term borrowings	₩ 3,400		$ 0

Borrowings and Debt Securitie_5

Borrowings and Debt Securities - Long-term Borrowings (Details) € in Thousands, ¥ in Thousands, JD in Thousands, $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2022 KRW (₩)	Dec. 31, 2021 KRW (₩)	Dec. 31, 2022 USD ($)	Dec. 31, 2022 JOD (JD)	Dec. 31, 2022 JPY (¥)	Dec. 31, 2022 EUR (€)	Dec. 31, 2022 AUD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 JOD (JD)	Dec. 31, 2021 JPY (¥)	Dec. 31, 2021 EUR (€)
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings	₩ 6,615,470	₩ 3,742,184
Less : Discount on long-term borrowings	(15,719)	(14,905)
Less : Current portion of long-term borrowings	(3,638,202)	(1,463,703)
Add : Current portion of discount on long-term borrowings	774	2,048
Long-term borrowings	2,962,323	2,265,624
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings	₩ 4,981,208	₩ 2,720,355
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Korea Development Bank	Korea Development Bank
Purpose of borrowings	Others	Others
Borrowings, interest rate	0.50%	0.50%	0.50%	0.50%	0.50%	0.50%	0.50%	0.50%	0.50%	0.50%	0.50%
Borrowings	₩ 2,133	₩ 2,509
Local long-term borrowings | Minimum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, maturity	2023	2023
Local long-term borrowings | Maximum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, maturity	2044	2044
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Korea Development Bank	Korea Development Bank
Purpose of borrowings	Facility	Facility
Borrowings	₩ 28,420	₩ 39,430
Local long-term borrowings | Minimum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, interest rate	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
Borrowings, maturity	2023	2022
Local long-term borrowings | Maximum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, interest rate	4.60%	4.60%	4.60%	4.60%	4.60%	4.60%	4.60%	4.60%	4.60%	4.60%	4.60%
Borrowings, maturity	2028	2028
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Korea Development Bank	Korea Development Bank
Purpose of borrowings	Facility	Operating funds
Borrowings, interest rate		2.33%						2.33%	2.33%	2.33%	2.33%
Borrowings, interest rate basis	CB rate+0.90
Borrowings, maturity	2029	2022
Borrowings	₩ 9,985	₩ 20,000
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Korea Development Bank	Korea Development Bank
Purpose of borrowings	Operating funds	Operating funds
Borrowings, interest rate basis	1yr KDB rate+0.81~0.91	1yr KDB bond rate + 0.81~0.95
Borrowings	₩ 54,300	₩ 64,300
Local long-term borrowings | Minimum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, adjustment to interest rate basis	0.81%	0.81%	0.81%	0.81%	0.81%	0.81%	0.81%	0.81%	0.81%	0.81%	0.81%
Borrowings, maturity	2023	2022
Local long-term borrowings | Maximum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, adjustment to interest rate basis	0.91%	0.95%	0.91%	0.91%	0.91%	0.91%	0.91%	0.95%	0.95%	0.95%	0.95%
Borrowings, maturity	2024	2023
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Hana Bank and others	Hana Bank
Purpose of borrowings	Commercial Paper	Commercial Paper
Borrowings, interest rate basis	3M CD+0.13~1.20	3M CD+0.13~0.43
Borrowings	₩ 3,250,000	₩ 1,050,000
Local long-term borrowings | Minimum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, adjustment to interest rate basis	0.13%	0.13%	0.13%	0.13%	0.13%	0.13%	0.13%	0.13%	0.13%	0.13%	0.13%
Borrowings, maturity	2023	2022
Local long-term borrowings | Maximum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, adjustment to interest rate basis	1.20%	0.43%	1.20%	1.20%	1.20%	1.20%	1.20%	0.43%	0.43%	0.43%	0.43%
Borrowings, maturity	2027	2025
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Hana Bank and others	Hana Bank
Purpose of borrowings	Facility	Facility
Borrowings, interest rate	4.60%	4.60%	4.60%	4.60%	4.60%	4.60%	4.60%	4.60%	4.60%	4.60%	4.60%
Borrowings, maturity	2028	2028
Borrowings	₩ 8,137	₩ 9,647
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Hana Bank and others	Hana Bank
Purpose of borrowings	Facility	Facility
Borrowings, interest rate basis	3yr KTB rate-1.50	3yr KTB rate-1.25
Borrowings, maturity	2028
Borrowings	₩ 3,821	₩ 4,485
Local long-term borrowings | Minimum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, maturity		2022
Local long-term borrowings | Maximum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, maturity		2028
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Export-Import Bank of Korea	IBK
Purpose of borrowings	Project loans	PF Refinancing
Borrowings, interest rate	1.50%		1.50%	1.50%	1.50%	1.50%	1.50%
Borrowings, interest rate basis		CD+1.25
Borrowings, maturity	2026	2030
Borrowings	₩ 10,312	₩ 8,589
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Export-Import Bank of Korea	Export-Import Bank of Korea
Purpose of borrowings	Facility	Project loans
Borrowings, interest rate	1.32%	1.50%	1.32%	1.32%	1.32%	1.32%	1.32%	1.50%	1.50%	1.50%	1.50%
Borrowings, maturity	2028	2026
Borrowings	₩ 58,100	₩ 13,258
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Export-Import Bank of Korea	Export-Import Bank of Korea
Purpose of borrowings	Operating funds	Facility
Borrowings, interest rate	1.78%	1.32%	1.78%	1.78%	1.78%	1.78%	1.78%	1.32%	1.32%	1.32%	1.32%
Borrowings, maturity	2023	2028
Borrowings	₩ 15,700	₩ 32,000
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Korea Energy Agency	Export-Import Bank of Korea
Purpose of borrowings	Development of power resources	Operating funds
Borrowings, interest rate		1.78%						1.78%	1.78%	1.78%	1.78%
Borrowings, interest rate basis	3yr KTB rate-2.25 1.50~1.75
Borrowings, maturity		2023
Borrowings	₩ 11,175	₩ 15,700
Local long-term borrowings | Minimum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, maturity	2023
Local long-term borrowings | Maximum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, maturity	2028
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Korea Energy Agency	Korea Energy Agency
Purpose of borrowings	Facility	Development of power resources
Borrowings, interest rate basis	3yr KTB rate-2.50	3yr KTB rate-2.25
Borrowings	₩ 393	₩ 8,971
Local long-term borrowings | Minimum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, maturity	2023	2023
Local long-term borrowings | Maximum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, maturity	2024	2025
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Korea Energy Agency	Korea Energy Agency
Purpose of borrowings	Project loans	Facility
Borrowings, interest rate basis	—	3yr KTB rate-2.25
Borrowings	₩ 1,197	₩ 995
Local long-term borrowings | Minimum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, maturity	2023	2022
Local long-term borrowings | Maximum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, maturity	2027	2024
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Shinhan Bank and others	Korea Energy Agency
Purpose of borrowings	Facility	Project loans
Borrowings, interest rate basis	CB rate+0.90~1.10	—
Borrowings, maturity		2023
Borrowings	₩ 19,195	₩ 1,197
Local long-term borrowings | Minimum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, adjustment to interest rate basis	0.90%		0.90%	0.90%	0.90%	0.90%	0.90%
Borrowings, maturity	2028
Local long-term borrowings | Maximum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, adjustment to interest rate basis	1.10%		1.10%	1.10%	1.10%	1.10%	1.10%
Borrowings, maturity	2029
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Shinhan Bank and others	Korea Energy Agency
Purpose of borrowings	Commercial Paper	Others
Borrowings, interest rate		1.75%						1.75%	1.75%	1.75%	1.75%
Borrowings, interest rate basis	3M CD+0.38
Borrowings, maturity	2025	2028
Borrowings	₩ 150,000	₩ 4,893
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Shinhan Bank and others	Shinhan Bank and others
Purpose of borrowings	Others	Facility
Borrowings, interest rate	3.95%		3.95%	3.95%	3.95%	3.95%	3.95%
Borrowings, interest rate basis		CB rate+1.10
Borrowings, maturity	2034	2028
Borrowings	₩ 78,905	₩ 14,470
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Shinhan Bank and others	Shinhan Bank and others
Purpose of borrowings	Others	Commercial Paper
Borrowings, interest rate basis	Standard overdraft rate+1.00	3M CD+0.38
Borrowings, maturity	2034	2025
Borrowings	₩ 78,905	₩ 150,000
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Kookmin Bank	Shinhan Bank and others
Purpose of borrowings	Facility	Others
Borrowings, interest rate		3.95%						3.95%	3.95%	3.95%	3.95%
Borrowings, interest rate basis	MOR+0.79 3M CD+1.79 5.04
Borrowings, maturity		2034
Borrowings	₩ 105,155	₩ 84,179
Local long-term borrowings | Minimum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, maturity	2023
Local long-term borrowings | Maximum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, maturity	2035
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Woori Bank	Shinhan Bank and others
Purpose of borrowings	Others	Others
Borrowings, interest rate	4%		4%	4%	4%	4%	4%
Borrowings, interest rate basis		Standard overdraft rate+1.00
Borrowings, maturity	2025	2034
Borrowings	₩ 20,700	₩ 84,179
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Woori Bank	Kookmin Bank
Purpose of borrowings	Facility	Facility
Borrowings, interest rate	5.04%		5.04%	5.04%	5.04%	5.04%	5.04%
Borrowings, interest rate basis	3M Libor+1.90 5.04	MOR+0.79 3M CD+1.79
Borrowings, adjustment to interest rate basis	1.90%		1.90%	1.90%	1.90%	1.90%	1.90%
Borrowings	₩ 48,823	₩ 59,333
Local long-term borrowings | Minimum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, adjustment to interest rate basis		0.79%						0.79%	0.79%	0.79%	0.79%
Borrowings, maturity	2035	2022
Local long-term borrowings | Maximum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, adjustment to interest rate basis		1.79%						1.79%	1.79%	1.79%	1.79%
Borrowings, maturity	2042	2031
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Others	Others
Purpose of borrowings	Facility	Facility
Borrowings	₩ 690,259	₩ 620,185
Local long-term borrowings | Minimum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, interest rate	3.50%	2.80%	3.50%	3.50%	3.50%	3.50%	3.50%	2.80%	2.80%	2.80%	2.80%
Borrowings, maturity	2028	2024
Local long-term borrowings | Maximum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, interest rate	6.80%	6.80%	6.80%	6.80%	6.80%	6.80%	6.80%	6.80%	6.80%	6.80%	6.80%
Borrowings, maturity	2044	2039
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Others	Others
Purpose of borrowings	Facility	Facility
Borrowings, interest rate		3.37%						3.37%	3.37%	3.37%	3.37%
Borrowings, interest rate basis	CB rate+1.10 1.75~4.56	CB rate+0.90~1.10 3M CD+1.60 3.37
Borrowings, adjustment to interest rate basis	1.10%	1.60%	1.10%	1.10%	1.10%	1.10%	1.10%	1.60%	1.60%	1.60%	1.60%
Borrowings	₩ 103,131	₩ 171,733
Local long-term borrowings | Minimum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, interest rate	1.75%		1.75%	1.75%	1.75%	1.75%	1.75%
Borrowings, adjustment to interest rate basis		0.90%						0.90%	0.90%	0.90%	0.90%
Borrowings, maturity	2024	2028
Local long-term borrowings | Maximum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, interest rate	4.56%		4.56%	4.56%	4.56%	4.56%	4.56%
Borrowings, adjustment to interest rate basis		1.10%						1.10%	1.10%	1.10%	1.10%
Borrowings, maturity	2036	2037
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Others	Others
Purpose of borrowings	PF Refinancing	PF Refinancing
Borrowings, interest rate basis	CB rate+1.25
Borrowings, maturity	2030
Borrowings	₩ 7,634	₩ 71,742
Local long-term borrowings | Minimum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, interest rate		3.80%						3.80%	3.80%	3.80%	3.80%
Borrowings, maturity		2030
Local long-term borrowings | Maximum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, interest rate		5%						5%	5%	5%	5%
Borrowings, maturity		2034
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Others	Others
Purpose of borrowings	PF Refinancing	PF Refinancing
Borrowings, interest rate	4.10%	1.75%	4.10%	4.10%	4.10%	4.10%	4.10%	1.75%	1.75%	1.75%	1.75%
Borrowings, maturity	2030	2029
Borrowings	₩ 21,206	₩ 22,265
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Others	Others
Purpose of borrowings	Securitized debts (*)	Others
Borrowings, interest rate basis	3M CD+1.80
Borrowings, maturity	2025
Borrowings	₩ 33,476	₩ 116,367
Local long-term borrowings | Minimum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, interest rate		4.40%						4.40%	4.40%	4.40%	4.40%
Borrowings, maturity		2022
Local long-term borrowings | Maximum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, interest rate		7.90%						7.90%	7.90%	7.90%	7.90%
Borrowings, maturity		2038
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Others	Others
Purpose of borrowings	Others	Others
Borrowings	₩ 120,217	₩ 49,928
Local long-term borrowings | Minimum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, interest rate	4.40%	1.80%	4.40%	4.40%	4.40%	4.40%	4.40%	1.80%	1.80%	1.80%	1.80%
Borrowings, maturity	2023	2031
Local long-term borrowings | Maximum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, interest rate	7.90%	4.50%	7.90%	7.90%	7.90%	7.90%	7.90%	4.50%	4.50%	4.50%	4.50%
Borrowings, maturity	2039	2034
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Others
Purpose of borrowings	Others
Borrowings	₩ 49,929
Local long-term borrowings | Minimum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, interest rate	1.80%		1.80%	1.80%	1.80%	1.80%	1.80%
Borrowings, maturity	2031
Local long-term borrowings | Maximum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, interest rate	4.50%		4.50%	4.50%	4.50%	4.50%	4.50%
Borrowings, maturity	2034
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings	₩ 1,634,262	₩ 1,021,829
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Korea Energy Agency	Korea Energy Agency
Purpose of borrowings	Project loans	Project loans
Borrowings, interest rate basis	—	—
Borrowings, maturity	2026	2026
Borrowings	₩ 11,081	₩ 10,366	$ 8,744,000					$ 8,744,000
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Export-Import Bank of Korea and others	Export-Import Bank of Korea and others
Purpose of borrowings	Direct Loan and others	Direct loan and others
Borrowings, interest rate basis	6M Libor+3.20	1M Libor+1.80~3.20
Borrowings, maturity	2036	2036
Borrowings	₩ 98,969	₩ 106,485	$ 78,094					$ 89,823,000
Foreign long-term borrowings | Minimum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, adjustment to interest rate basis		1.80%						1.80%	1.80%	1.80%	1.80%
Foreign long-term borrowings | Maximum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, adjustment to interest rate basis		3.20%						3.20%	3.20%	3.20%	3.20%
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Export-Import Bank of Korea and others	Export-Import Bank of Korea and others
Purpose of borrowings	Direct Loan and others	Direct loan and others
Borrowings, interest rate basis	3M Libor+2.25~3.70	3M Libor+2.75~3.70
Borrowings, maturity	2027	2027
Borrowings	₩ 162,692	₩ 180,363		JD 91,051					JD 107,868
Foreign long-term borrowings | Minimum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, adjustment to interest rate basis	2.25%	2.75%	2.25%	2.25%	2.25%	2.25%	2.25%	2.75%	2.75%	2.75%	2.75%
Foreign long-term borrowings | Maximum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, adjustment to interest rate basis	3.70%	3.70%	3.70%	3.70%	3.70%	3.70%	3.70%	3.70%	3.70%	3.70%	3.70%
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Export-Import Bank of Korea and others	Export-Import Bank of Korea and others
Purpose of borrowings	Facility	PF Loan
Borrowings, interest rate basis	6M Libor+1.70~2.50 SOFR(3M) +1.83	6M Libor+1.70~2.50
Borrowings, maturity		2032
Borrowings	₩ 167,496	₩ 122,509	$ 132,168,000					$ 103,340,000
Foreign long-term borrowings | Minimum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, adjustment to interest rate basis	1.70%	1.70%	1.70%	1.70%	1.70%	1.70%	1.70%	1.70%	1.70%	1.70%	1.70%
Borrowings, maturity	2032
Foreign long-term borrowings | Maximum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, adjustment to interest rate basis	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
Borrowings, maturity	2039
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Kookmin Bank and others	POSCO and others
Purpose of borrowings	EBL	Shareholder’s loan
Borrowings, interest rate		8%						8%	8%	8%	8%
Borrowings, interest rate basis	SOFR(1M)+0.11~0.75
Borrowings, maturity	2024	2025
Borrowings	₩ 189,578	₩ 14,171	$ 149,592,000					$ 11,953,000
Foreign long-term borrowings | Minimum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, adjustment to interest rate basis	0.11%		0.11%	0.11%	0.11%	0.11%	0.11%
Foreign long-term borrowings | Maximum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, adjustment to interest rate basis	0.75%		0.75%	0.75%	0.75%	0.75%	0.75%
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Riyad Bank	Samsung Life Insurance and others
Purpose of borrowings	EBL	Shareholder’s loan
Borrowings, interest rate		8%						8%	8%	8%	8%
Borrowings, interest rate basis	SOFR(3M)+1.20
Borrowings, maturity	2025	2031
Borrowings	₩ 63,201	₩ 8,114	$ 49,870,000						JD 4,853
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	POSCO and others	Samsung Life Insurance and others
Purpose of borrowings	Shareholder’s loan	Syndicated Loan
Borrowings, interest rate	8%		8%	8%	8%	8%	8%
Borrowings, maturity	2025	2032
Borrowings	₩ 12,680	₩ 53,000	$ 10,005,000							¥ 5,144,387
Foreign long-term borrowings | Minimum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, interest rate		3.10%						3.10%	3.10%	3.10%	3.10%
Foreign long-term borrowings | Maximum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, interest rate		8%						8%	8%	8%	8%
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	POSCO and others	Woori Bank and others
Purpose of borrowings	Shareholder’s loan	Syndicated Loan
Borrowings, interest rate	8%		8%	8%	8%	8%	8%
Borrowings, interest rate basis		JPY 6M Libor+2.00
Borrowings, maturity	2031	2032
Borrowings	₩ 8,671	₩ 29,060		JD 4,853						¥ 2,820,708
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Samsung Life Insurance and others	KiwoomSolar Power Professional Investor Private Placement Investment Trust V
Purpose of borrowings	Syndicated Loan	Senior borrowing
Borrowings, interest rate		3.90%						3.90%	3.90%	3.90%	3.90%
Borrowings, maturity	2032	2029
Borrowings	₩ 45,304	₩ 48,741			¥ 4,752,934						€ 36,311
Foreign long-term borrowings | Minimum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, interest rate	3.10%		3.10%	3.10%	3.10%	3.10%	3.10%
Foreign long-term borrowings | Maximum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, interest rate	8%		8%	8%	8%	8%	8%
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Woori Bank and others	IFC and others
Purpose of borrowings	Syndicated Loan	Others
Borrowings, interest rate basis	JPY 6M Libor+1.84	6M Libor+5.00
Borrowings, maturity	2032	2031
Borrowings	₩ 24,910	₩ 272,686			¥ 2,613,385			$ 230,018,000
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Solar Construction Lendings, LLC	Federal Financing Bank and others
Purpose of borrowings	Facility	PF Loan
Borrowings, interest rate	5%		5%	5%	5%	5%	5%
Borrowings, maturity	2025
Borrowings	₩ 39,464	₩ 111,597	$ 31,140,000					$ 94,135,000
Foreign long-term borrowings | Minimum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, interest rate		2.39%						2.39%	2.39%	2.39%	2.39%
Borrowings, maturity		2031
Foreign long-term borrowings | Maximum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, interest rate		6%						6%	6%	6%	6%
Borrowings, maturity		2038
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor		Others
Purpose of borrowings	Senior borrowing	Others
Borrowings, interest rate basis	3.90	—
Borrowings, maturity	2029
Borrowings	₩ 54,765	₩ 64,737				€ 40,531		$ 54,607,000
Foreign long-term borrowings | Minimum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, maturity	2028
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Purpose of borrowings	Others
Borrowings, interest rate basis	6M Libor+5.00 SOFR(3M)+1.83~1.99 5.41~6.19
Borrowings	₩ 517,575		$ 408,408,000
Foreign long-term borrowings | Minimum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, interest rate	5.41%		5.41%	5.41%	5.41%	5.41%	5.41%
Borrowings, adjustment to interest rate basis	1.83%		1.83%	1.83%	1.83%	1.83%	1.83%
Foreign long-term borrowings | Maximum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, interest rate	6.19%		6.19%	6.19%	6.19%	6.19%	6.19%
Borrowings, adjustment to interest rate basis	1.99%		1.99%	1.99%	1.99%	1.99%	1.99%
Borrowings, maturity	2031
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Hanwha US Solar Private Fund and others
Purpose of borrowings	PF Refinancing
Borrowings, adjustment to interest rate basis	3%		3%	3%	3%	3%	3%
Borrowings, maturity	2038
Borrowings	₩ 73,894		$ 58,308,000
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	DBS Bank and others
Purpose of borrowings	Facility
Borrowings, interest rate basis	1M BBSY+1.40~2.25
Borrowings, maturity	2025
Borrowings	₩ 163,836						$ 190,860
Foreign long-term borrowings | Minimum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, adjustment to interest rate basis	1.40%		1.40%	1.40%	1.40%	1.40%	1.40%
Foreign long-term borrowings | Maximum
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings, adjustment to interest rate basis	2.25%		2.25%	2.25%	2.25%	2.25%	2.25%
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Others
Purpose of borrowings	Others
Borrowings, interest rate basis	—
Borrowings, maturity	—
Borrowings	₩ 146		$ 116,000

Borrowings and Debt Securitie_6

Borrowings and Debt Securities - Local Debt Securities and Foreign Debt Securities (Details) € in Thousands, kr in Thousands, SFr in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2022 KRW (₩)	Dec. 31, 2021 KRW (₩)	Dec. 31, 2022 USD ($)	Dec. 31, 2022 EUR (€)	Dec. 31, 2022 SEK (kr)	Dec. 31, 2022 HKD ($)	Dec. 31, 2022 CHF (SFr)	Dec. 31, 2022 AUD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 EUR (€)	Dec. 31, 2021 SEK (kr)	Dec. 31, 2021 HKD ($)	Dec. 31, 2021 CHF (SFr)	Dec. 31, 2021 AUD ($)
Local Debt securities
Debt Instrument [Line Items]
Notional amount	₩ 90,494,766	₩ 62,274,472
Less : Discount on debt securities	(56,924)	(52,723)
Less: Current portion of foreign debt securities	(8,401,619)	(7,432,647)
Add : Current portion of discount on debt securities	2,344	2,510
Total	₩ 82,038,567	54,791,612
Electricity Bonds
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	2012.03.27~2022.12.28
Notional amount	₩ 61,190,000	₩ 34,080,000
Electricity Bonds | Minimum
Debt Instrument [Line Items]
Borrowings, maturity	2023.01.11
Borrowings, interest rate	1.14%		1.14%	1.14%	1.14%	1.14%	1.14%	1.14%
Electricity Bonds | Maximum
Debt Instrument [Line Items]
Borrowings, maturity	2052.04.21
Borrowings, interest rate	5.99%		5.99%	5.99%	5.99%	5.99%	5.99%	5.99%
Corporate bonds
Debt Instrument [Line Items]
Debt Instrument, Issuance Date		2009.10.16~2022.12.20
Notional amount	₩ 29,293,188	₩ 28,194,472
Corporate bonds | Minimum
Debt Instrument [Line Items]
Borrowings, maturity	2023.01.11
Borrowings, interest rate	1.01%		1.01%	1.01%	1.01%	1.01%	1.01%	1.01%
Corporate bonds | Maximum
Debt Instrument [Line Items]
Borrowings, maturity	2052.08.24
Borrowings, interest rate	6.06%		6.06%	6.06%	6.06%	6.06%	6.06%	6.06%
Corporate bonds
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	2021.05.26
Borrowings, maturity	2041.05.25
Borrowings, interest rate	2%		2%	2%	2%	2%	2%	2%
Notional amount	₩ 11,578	0
Foreign Debt securities
Debt Instrument [Line Items]
Notional amount	14,871,549	11,764,298
Less : Discount on debt securities	(124,865)	(105,407)
Add: Premium on foreign debt securities	663	1,031
Less: Current portion of foreign debt securities	(1,803,776)	(2,220,339)
Add : Current portion of discount on debt securities	1,902	2,860
Total	₩ 12,945,473	₩ 9,442,443
FY-96
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	1996.04.01~ 1996.12.06	1996.04.01~1996.12.06
Notional amount	₩ 353,198	₩ 330,400	$ 278,701						$ 278,701
FY-96 | Minimum
Debt Instrument [Line Items]
Borrowings, maturity	2026.12.01	2026.12.01
Borrowings, interest rate	6%	6%	6%	6%	6%	6%	6%	6%	6%	6%	6%	6%	6%	6%
FY-96 | Maximum
Debt Instrument [Line Items]
Borrowings, maturity	2096.04.01	2096.04.01
Borrowings, interest rate	7.95%	7.95%	7.95%	7.95%	7.95%	7.95%	7.95%	7.95%	7.95%	7.95%	7.95%	7.95%	7.95%	7.95%
FY-97
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	1997.01.31~1997.08.04	1997.01.31~1997.08.04
Notional amount	₩ 398,841	₩ 373,097	$ 314,717						$ 314,717
FY-97 | Minimum
Debt Instrument [Line Items]
Borrowings, maturity	2027.02.01	2027.02.01
Borrowings, interest rate	6.75%	6.75%	6.75%	6.75%	6.75%	6.75%	6.75%	6.75%	6.75%	6.75%	6.75%	6.75%	6.75%	6.75%
FY-97 | Maximum
Debt Instrument [Line Items]
Borrowings, maturity	2027.08.01	2027.08.01
Borrowings, interest rate	7%	7%	7%	7%	7%	7%	7%	7%	7%	7%	7%	7%	7%	7%
FY-04
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	2004.04.23	2004.04.23
Borrowings, maturity	2034.04.23	2034.04.23
Borrowings, interest rate	5.13%	5.13%	5.13%	5.13%	5.13%	5.13%	5.13%	5.13%	5.13%	5.13%	5.13%	5.13%	5.13%	5.13%
Notional amount	₩ 363,614	₩ 340,144	$ 286,920						$ 286,920
FY-12
Debt Instrument [Line Items]
Debt Instrument, Issuance Date		2012.09.19
Borrowings, maturity		2022.09.19
Borrowings, interest rate		3%							3%	3%	3%	3%	3%	3%
Notional amount		₩ 889,125							$ 750,000
FY-14
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	2014.07.30	2014.07.30
Borrowings, maturity	2029.07.30	2029.07.30
Borrowings, interest rate	3.57%	3.57%	3.57%	3.57%	3.57%	3.57%	3.57%	3.57%	3.57%	3.57%	3.57%	3.57%	3.57%	3.57%
Notional amount	₩ 126,730	₩ 118,550	$ 100,000						$ 100,000
FY-15
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	2015.06.15	2015.06.15
Borrowings, maturity	2025.06.15	2025.06.15
Borrowings, interest rate	3.25%	3.25%	3.25%	3.25%	3.25%	3.25%	3.25%	3.25%	3.25%	3.25%	3.25%	3.25%	3.25%	3.25%
Notional amount	₩ 380,190	₩ 355,650	$ 300,000						$ 300,000
FY-17
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	2017.07.25	2017.06.19~2017.07.25
Borrowings, maturity	2027.07.25
Borrowings, interest rate	3.13%		3.13%	3.13%	3.13%	3.13%	3.13%	3.13%
Notional amount	₩ 380,190	₩ 948,400	$ 300,000						$ 800,000
FY-17 | Minimum
Debt Instrument [Line Items]
Borrowings, maturity		2022.06.19
Borrowings, interest rate		2.63%							2.63%	2.63%	2.63%	2.63%	2.63%	2.63%
FY-17 | Maximum
Debt Instrument [Line Items]
Borrowings, maturity		2027.07.25
Borrowings, interest rate		3.13%							3.13%	3.13%	3.13%	3.13%	3.13%	3.13%
FY-17
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	2017.10.30	2017.10.30
Borrowings, maturity	2037.10.30	2037.10.30
Borrowings, interest rate	1.70%	1.70%	1.70%	1.70%	1.70%	1.70%	1.70%	1.70%	1.70%	1.70%	1.70%	1.70%	1.70%	1.70%
Notional amount	₩ 54,048	₩ 53,694		€ 40,000						€ 40,000
FY-17
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	2017.11.16	2017.11.16
Borrowings, maturity	2037.11.16	2037.11.16
Borrowings, interest rate	2.36%	2.36%	2.36%	2.36%	2.36%	2.36%	2.36%	2.36%	2.36%	2.36%	2.36%	2.36%	2.36%	2.36%
Notional amount	₩ 54,527	₩ 58,968			kr 450,000						kr 450,000
FY-18
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	2018.03.13	2018.03.13
Borrowings, maturity	2028.03.13	2028.03.13
Borrowings, interest rate	3.35%	3.35%	3.35%	3.35%	3.35%	3.35%	3.35%	3.35%	3.35%	3.35%	3.35%	3.35%	3.35%	3.35%
Notional amount	₩ 268,208	₩ 250,850				$ 1,650,000						$ 1,650,000
FY-18
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	2018.06.07~2018.07.25	2018.06.07~2018.07.25
Notional amount	₩ 1,774,220	₩ 1,659,700	$ 1,400,000						$ 1,400,000
FY-18 | Minimum
Debt Instrument [Line Items]
Borrowings, maturity	2023.06.07	2023.06.07
Borrowings, interest rate	3.75%	3.75%	3.75%	3.75%	3.75%	3.75%	3.75%	3.75%	3.75%	3.75%	3.75%	3.75%	3.75%	3.75%
FY-18 | Maximum
Debt Instrument [Line Items]
Borrowings, maturity	2023.07.25	2023.07.25
Borrowings, interest rate	3.88%	3.88%	3.88%	3.88%	3.88%	3.88%	3.88%	3.88%	3.88%	3.88%	3.88%	3.88%	3.88%	3.88%
FY-19
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	2019.02.27	2019.01.22~2019.06.24
Borrowings, maturity	2024.02.27
Borrowings, interest rate	0.13%		0.13%	0.13%	0.13%	0.13%	0.13%	0.13%
Notional amount	₩ 274,574	₩ 948,400					SFr 200,000		$ 800,000
FY-19 | Minimum
Debt Instrument [Line Items]
Borrowings, maturity		2022.01.22
Borrowings, interest rate		2.50%							2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
FY-19 | Maximum
Debt Instrument [Line Items]
Borrowings, maturity		2024.06.24
Borrowings, interest rate		3.38%							3.38%	3.38%	3.38%	3.38%	3.38%	3.38%
FY-19
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	2019.06.24	2019.02.27
Borrowings, maturity	2024.06.24	2024.02.27
Borrowings, interest rate	2.50%	0.13%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	0.13%	0.13%	0.13%	0.13%	0.13%	0.13%
Notional amount	₩ 633,650	₩ 259,494	$ 500,000										SFr 200,000
FY-19
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	2019.07.19	2019.07.19
Notional amount	₩ 411,861	₩ 389,241					SFr 300,000						SFr 300,000
FY-19 | Minimum
Debt Instrument [Line Items]
Borrowings, maturity	2024.07.19	2024.07.19
Borrowings, interest rate	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%
FY-19 | Maximum
Debt Instrument [Line Items]
Borrowings, maturity	2027.07.19	2027.07.19
Borrowings, interest rate	0.05%	0.05%	0.05%	0.05%	0.05%	0.05%	0.05%	0.05%	0.05%	0.05%	0.05%	0.05%	0.05%	0.05%
FY-19
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	2019.10.30	2019.07.22
Borrowings, maturity	2024.10.30	2022.07.22
Borrowings, interest rate		2.38%							2.38%	2.38%	2.38%	2.38%	2.38%	2.38%
Interest rate (%)	3M BBSW+0.97
Borrowings, adjustment to interest rate basis	0.97%		0.97%	0.97%	0.97%	0.97%	0.97%	0.97%
Notional amount	₩ 257,523	₩ 355,650						$ 300,000	$ 300,000
FY-19
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	2019.12.19	2019.10.30
Borrowings, maturity	2037.12.31	2024.10.30
Interest rate (%)		3M BBSW+0.97
Borrowings, adjustment to interest rate basis		0.97%							0.97%	0.97%	0.97%	0.97%	0.97%	0.97%
Notional amount	₩ 457,368	₩ 257,667	$ 360,899											$ 300,000
FY-19 | Minimum
Debt Instrument [Line Items]
Borrowings, interest rate	3.30%		3.30%	3.30%	3.30%	3.30%	3.30%	3.30%
FY-19 | Maximum
Debt Instrument [Line Items]
Borrowings, interest rate	5.70%		5.70%	5.70%	5.70%	5.70%	5.70%	5.70%
FY-19
Debt Instrument [Line Items]
Debt Instrument, Issuance Date		2019.12.19
Borrowings, maturity		2037.12.31
Notional amount		₩ 440,943							$ 371,947
FY-19 | Minimum
Debt Instrument [Line Items]
Borrowings, interest rate		3.30%							3.30%	3.30%	3.30%	3.30%	3.30%	3.30%
FY-19 | Maximum
Debt Instrument [Line Items]
Borrowings, interest rate		5.70%							5.70%	5.70%	5.70%	5.70%	5.70%	5.70%
FY-20
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	2020.02.03	2020.02.03
Borrowings, maturity	2025.02.03	2025.02.03
Borrowings, interest rate	2.13%	2.13%	2.13%	2.13%	2.13%	2.13%	2.13%	2.13%	2.13%	2.13%	2.13%	2.13%	2.13%	2.13%
Notional amount	₩ 380,190	₩ 355,650	$ 300,000						$ 300,000
FY-20
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	2020.05.06	2020.05.06
Borrowings, maturity	2025.05.06	2025.05.06
Borrowings, interest rate	1.75%	1.75%	1.75%	1.75%	1.75%	1.75%	1.75%	1.75%	1.75%	1.75%	1.75%	1.75%	1.75%	1.75%
Notional amount	₩ 633,650	₩ 592,750	$ 500,000						$ 500,000
FY-20
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	2020.06.15	2020.06.15
Borrowings, maturity	2025.06.15	2025.06.15
Borrowings, interest rate	1.13%	1.13%	1.13%	1.13%	1.13%	1.13%	1.13%	1.13%	1.13%	1.13%	1.13%	1.13%	1.13%	1.13%
Notional amount	₩ 633,650	₩ 592,750	$ 500,000						$ 500,000
FY-20
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	2020.08.03	2020.08.03
Borrowings, maturity	2026.02.03	2026.02.03
Borrowings, interest rate	1%	0.61%	1%	1%	1%	1%	1%	1%	0.61%	0.61%	0.61%	0.61%	0.61%	0.61%
Notional amount	₩ 380,190	₩ 355,650	$ 300,000						$ 300,000
FY-21
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	2021.01.27	2021.01.27
Borrowings, maturity	2026.01.27	2026.01.27
Borrowings, interest rate	0.75%	0.75%	0.75%	0.75%	0.75%	0.75%	0.75%	0.75%	0.75%	0.75%	0.75%	0.75%	0.75%	0.75%
Notional amount	₩ 570,285	₩ 533,475	$ 450,000						$ 450,000
FY-21
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	2021.04.27	2021.04.27
Borrowings, maturity	2026.04.27	2026.04.27
Borrowings, interest rate	1.25%	1.25%	1.25%	1.25%	1.25%	1.25%	1.25%	1.25%	1.25%	1.25%	1.25%	1.25%	1.25%	1.25%
Notional amount	₩ 633,650	₩ 592,750	$ 500,000						$ 500,000
FY-21
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	2021.08.09	2021.08.09
Borrowings, maturity	2026.08.09	2026.08.09
Borrowings, interest rate	1.25%	1.25%	1.25%	1.25%	1.25%	1.25%	1.25%	1.25%	1.25%	1.25%	1.25%	1.25%	1.25%	1.25%
Notional amount	₩ 380,190	₩ 355,650	$ 300,000						$ 300,000
FY-21
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	2021.09.24	2021.09.24
Borrowings, maturity	2026.09.24	2026.09.24
Borrowings, interest rate	1.13%	1.13%	1.13%	1.13%	1.13%	1.13%	1.13%	1.13%	1.13%	1.13%	1.13%	1.13%	1.13%	1.13%
Notional amount	₩ 380,190	₩ 355,650	$ 300,000						$ 300,000
FY-22
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	2022.04.21
Borrowings, maturity	2027.04.21
Borrowings, interest rate	3.63%		3.63%	3.63%	3.63%	3.63%	3.63%	3.63%
Notional amount	₩ 380,190		$ 300,000
FY-22
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	2022.05.06
Borrowings, maturity	2025.05.06
Borrowings, interest rate	3.60%		3.60%	3.60%	3.60%	3.60%	3.60%	3.60%
Notional amount	₩ 633,650		$ 500,000
FY-22
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	2022.06.14
Notional amount	₩ 1,013,840		$ 800,000
FY-22 | Minimum
Debt Instrument [Line Items]
Borrowings, maturity	2025.06.14
Borrowings, interest rate	3.63%		3.63%	3.63%	3.63%	3.63%	3.63%	3.63%
FY-22 | Maximum
Debt Instrument [Line Items]
Borrowings, maturity	2027.06.14
Borrowings, interest rate	4%		4%	4%	4%	4%	4%	4%
FY-22
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	2022.06.28
Borrowings, maturity	2025.06.28
Borrowings, interest rate	4.13%		4.13%	4.13%	4.13%	4.13%	4.13%	4.13%
Notional amount	₩ 380,190		$ 300,000
FY-22
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	2022.07.27
Borrowings, maturity	2027.07.27
Borrowings, interest rate	4.25%		4.25%	4.25%	4.25%	4.25%	4.25%	4.25%
Notional amount	₩ 887,110		$ 700,000
FY-22
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	2022.10.06
Notional amount	₩ 1,013,840		$ 800,000
FY-22 | Minimum
Debt Instrument [Line Items]
Borrowings, maturity	2026.04.06
Borrowings, interest rate	5.38%		5.38%	5.38%	5.38%	5.38%	5.38%	5.38%
FY-22 | Maximum
Debt Instrument [Line Items]
Borrowings, maturity	2028.04.06
Borrowings, interest rate	5.50%		5.50%	5.50%	5.50%	5.50%	5.50%	5.50%
FY-22
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	2022.10.06~2022.11.01
Borrowings, maturity	2032.10.06
Borrowings, interest rate	5.16%		5.16%	5.16%	5.16%	5.16%	5.16%	5.16%
Notional amount	₩ 381,992					$ 2,350,000

Borrowings and Debt Securitie_7

Borrowings and Debt Securities - Local Debt Securities and Foreign Debt Securities (Parenthetical) (Details) - Hee mang sunlight Power Co., Ltd [Member] ₩ in Millions	12 Months Ended
	Dec. 31, 2022 KRW (₩)
Debt Instrument [Line Items]
Value of bonds entitled to premature redemption	₩ 1,619
Premature redemption due date	Mar. 31, 2021

Borrowings and Debt Securitie_8

Borrowings and Debt Securities - Schedule of Changes in Borrowings and Debt Securities (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Changes In Borrowings and Debt Securities [Line Items]
Beginning balance	₩ 84,940,016	₩ 74,345,677
Ending balance	124,768,508	84,940,016
Borrowings and debt securities
Changes In Borrowings and Debt Securities [Line Items]
Beginning balance	80,529,513	69,724,581
Cash flows	39,193,816	9,653,394
Effect of exchange rate fluctuations	906,877	1,001,493
Others	(24,841)	150,045
Ending balance	₩ 120,605,365	₩ 80,529,513

Lease - Additional Information

Lease - Additional Information (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Statements [Line Items]
Expense relating to short-term leases for which recognition exemption has been used	₩ 235,473	₩ 199,490
Expense relating to leases of low-value assets for which recognition exemption has been used	3,147	2,349
Cash outflow related to leases	1,005,014	922,200
Discounted unguaranteed residual value of assets	₩ 22,910	₩ 19,574
Maximum
Statements [Line Items]
Implicit interest rate on finance lease	17.08%	16.83%
Minimum
Statements [Line Items]
Implicit interest rate on finance lease	0%	0%
Power Purchase Agreement | Maximum
Statements [Line Items]
Lease term of finance lease	11 years
Power Purchase Agreement | Minimum
Statements [Line Items]
Lease term of finance lease	2 years
Jordan Electric Power Company | Power Purchase Agreement
Statements [Line Items]
Lease term of finance lease	25 years
Fujeij Wind Power Plant | Power Purchase Agreement
Statements [Line Items]
Lease term of finance lease	20 years
Commission Federal De Elecrticidad | Power Purchase Agreement
Statements [Line Items]
Lease term of finance lease	25 years

Lease - Summary of Right-of-Use

Lease - Summary of Right-of-Use Assets (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021
Disclosure of quantitative information about right-of-use assets [line items]
Increase		₩ 12,486,698		₩ 12,638,471
Depreciation		(509,068)		(558,565)
Right-of-use assets
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		4,059,397		4,542,166
Increase		197,016		78,213
Depreciation		(509,068)		(558,565)
Decrease		(2,838)		(11,787)
Others		(33,382)		9,370
Ending balance		3,711,125		4,059,397
Right-of-use assets | Acquisition cost
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		7,848,138
Ending balance		5,992,724		7,848,138
Right-of-use assets | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		(3,788,741)
Ending balance		(2,281,599)		(3,788,741)
Land
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		652,795		706,579
Increase		63,654		7,312
Depreciation		(41,260)		(57,231)
Decrease		0		0
Others		(13,390)		(3,865)
Ending balance		661,799		652,795
Land | Acquisition cost
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		814,795
Ending balance		886,076		814,795
Land | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		(162,000)
Ending balance		(224,277)		(162,000)
Buildings
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		62,884		47,222
Increase		42,399		22,336
Depreciation		(30,243)		(25,780)
Decrease		(1,042)		(1,469)
Others		858		20,575
Ending balance		74,856		62,884
Buildings | Acquisition cost
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		106,823
Ending balance		135,290		106,823
Buildings | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		(43,939)
Ending balance		(60,434)		(43,939)
Structures
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		21,148		20,486
Increase		4,256		2,198
Depreciation		(1,758)		(1,536)
Decrease		0		0
Others		319		0
Ending balance		23,965		21,148
Structures | Acquisition cost
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		26,374
Ending balance		30,879		26,374
Structures | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		(5,226)
Ending balance		(6,914)		(5,226)
Machinery
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		565		695
Increase		429		0
Depreciation		(159)		(130)
Decrease		0		0
Others		0		0
Ending balance		835		565
Machinery | Acquisition cost
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		1,308
Ending balance		1,737		1,308
Machinery | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		(743)
Ending balance		(902)		(743)
Ships
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		3,029,219		3,437,363
Increase		0		9,694
Depreciation		(393,677)		(411,291)
Decrease		0		0
Others		(38,679)		(6,547)
Ending balance		2,596,863		3,029,219
Ships | Acquisition cost
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		4,217,735
Ending balance		4,151,460		4,217,735
Ships | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		(1,188,516)
Ending balance		(1,554,597)		(1,188,516)
Vehicles
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		13,618		13,525
Increase		13,475		9,583
Depreciation		(8,673)		(8,162)
Decrease		(962)		(7)
Others		(2,742)		(1,321)
Ending balance		14,716		13,618
Vehicles | Acquisition cost
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		30,375
Ending balance		35,712		30,375
Vehicles | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		(16,757)
Ending balance		(20,996)		(16,757)
Others
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		279,168	[1]	316,296
Increase		72,803		27,090
Depreciation		(33,298)		(54,435)
Decrease		(834)		(10,311)
Others		20,252		528
Ending balance	[1]	338,091		279,168
Others | Acquisition cost
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance	[1]	2,650,728
Ending balance	[1]	751,570		2,650,728
Others | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance	[1]	(2,371,560)
Ending balance	[1]	₩ (413,479)		₩ (2,371,560)
[1]Including a power purchase agreement (“PPA”) with CGN Yulchon Generation Co., Ltd.

Lease - Summary of Lease Liabil

Lease - Summary of Lease Liabilities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of maturity analysis of operating lease payments [line items]
Undiscounted operating lease payments to be received	₩ 4,612,352	₩ 4,928,988
Less : Discount	(449,209)	(518,485)
Present value of lease payment	4,163,143	4,410,503	₩ 4,621,096
Less than 1 year
Disclosure of maturity analysis of operating lease payments [line items]
Undiscounted operating lease payments to be received	639,756	620,121
1~5 Years
Disclosure of maturity analysis of operating lease payments [line items]
Undiscounted operating lease payments to be received	2,047,584	2,158,145
More than 5 years
Disclosure of maturity analysis of operating lease payments [line items]
Undiscounted operating lease payments to be received	₩ 1,925,012	₩ 2,150,722

Lease - Summary of Liquidity Cl

Lease - Summary of Liquidity Classification of Lease Liabilities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Lease liabilities [abstract]
Current lease liabilities	₩ 614,037	₩ 583,558
Non-current lease liabilities	3,549,106	3,826,945
Total lease liabilities	₩ 4,163,143	₩ 4,410,503	₩ 4,621,096

Lease - Summary of Changes in L

Lease - Summary of Changes in Lease Liabilities (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Disclosure - Changes in lease liabilities [Abstract]
Beginning balance		₩ 4,410,503	₩ 4,621,096
Increase		109,019	73,090
Decrease		(654,236)	(665,687)
Interest expenses		91,590	93,651
Others	[1]	206,267	288,353
Ending balance		₩ 4,163,143	₩ 4,410,503
[1]Including translation effect of foreign currency lease liabilities and others.

Lease - Summary of Details of E

Lease - Summary of Details of Expense Relating to Lease Contracts As Lessee (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disclosure - Details of expense relating to lease contracts as lessee [Abstract]
Depreciation of right-of-use assets	₩ 509,068	₩ 558,565
Interest expense on lease liabilities	91,590	93,651
Leases expenses for short-term leases	235,473	199,490
Leases expenses for leases of low-value assets	3,147	2,349
Variable lease payments	112,158	54,675
Total expense relating to lease contracts as lessee	₩ 951,436	₩ 908,730

Lease - Summary of Profit and L

Lease - Summary of Profit and Loss Related To Finance Lease (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disclosure of quantitative information about leases for lessor [abstract]
Finance income on the net investment in the lease	₩ 122,355	₩ 111,569

Lease - Summary of Maturity Ana

Lease - Summary of Maturity Analysis of Finance Lease Payments Receivable (Details) - Gross amount - KRW (₩) ₩ in Millions		Dec. 31, 2022	Dec. 31, 2021
Disclosure of maturity analysis of finance lease payments receivable [line items]
Undiscounted finance lease payments to be received		₩ 2,378,664	₩ 2,395,319
Less : Unearned finance income		(1,139,274)	(1,194,627)
Net investment in finance lease	[1]	1,239,390	1,200,692
Not Later Than 1 Year
Disclosure of maturity analysis of finance lease payments receivable [line items]
Undiscounted finance lease payments to be received		181,930	172,528
1~2 Years
Disclosure of maturity analysis of finance lease payments receivable [line items]
Undiscounted finance lease payments to be received		169,693	163,937
2~3 Years
Disclosure of maturity analysis of finance lease payments receivable [line items]
Undiscounted finance lease payments to be received		166,787	158,933
3~4 Years
Disclosure of maturity analysis of finance lease payments receivable [line items]
Undiscounted finance lease payments to be received		166,196	156,450
4~5 Years
Disclosure of maturity analysis of finance lease payments receivable [line items]
Undiscounted finance lease payments to be received		166,965	155,068
More than 5 years
Disclosure of maturity analysis of finance lease payments receivable [line items]
Undiscounted finance lease payments to be received		₩ 1,527,093	₩ 1,588,403
[1]Including the present value of unguaranteed residual value amounting to ￦19,574 million and ￦22,910 million, as of December 31, 2021 and 2022, respectively.

Lease - Summary of Changes in A

Lease - Summary of Changes in Allowance For Doubtful Accounts of Finance Lease Receivables (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Changes in the allowance for doubtful accounts of finance lease receivables [Abstract]
Beginning balance	₩ 768	₩ 990
Bad debt expense	3,737	0
Reversal of allowance for doubtful accounts	0	(222)
Ending balance	₩ 4,505	₩ 768

Employment Benefits - Summary o

Employment Benefits - Summary of Employment Benefits (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Disclosure of net defined benefit liability (asset) [abstract]
Net defined benefit asset	₩ 198,626	₩ 20,871
Net defined benefit obligations	825,927	1,675,741
Other long-term employee benefit obligations	₩ 2,794	₩ 3,417

Employment Benefits - Summary_2

Employment Benefits - Summary of Principal Assumptions on Actuarial Valuation (Details) - yr	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Statement [Line Items]
Future salary and benefit levels	4.55%	4.28%
Weighted average duration	8.84	10.39
Bottom of range [member]
Statement [Line Items]
Discount rate	5.16%	2.51%
Top of range [member]
Statement [Line Items]
Discount rate	5.19%	2.60%

Employment Benefits - Summary_3

Employment Benefits - Summary of Expense Relating to defined Benefit Plans (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure - Details of expense relating to defined benefit plans [Abstract]
Current service cost	₩ 496,722	₩ 524,942	₩ 509,520
Interest cost	116,256	91,877	83,248
Expected return on plan assets	(73,484)	(52,782)	(42,742)
Past service cost	125	5,483	(2,027)
Loss from settlement	0	0	0
Defined benefit	₩ 539,619	₩ 569,520	₩ 547,999

Employment Benefits - Summary_4

Employment Benefits - Summary of Expense Relating to Defined Benefit Plans by Nature (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of defined benefit plans [line items]
Defined benefit	₩ 539,619	₩ 569,520	₩ 547,999
Cost of sales [member]
Disclosure of defined benefit plans [line items]
Defined benefit	404,243	416,287	397,442
Selling, general and administrative expense [member]
Disclosure of defined benefit plans [line items]
Defined benefit	81,457	95,983	94,846
Others (Construction-in-progress and others) [member]
Disclosure of defined benefit plans [line items]
Defined benefit	₩ 53,919	₩ 57,250	₩ 55,711

Employment Benefits - Summary_5

Employment Benefits - Summary of Defined Benefits (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Surplus (deficit) in plan [abstract]
Present value of defined benefit obligation from funded plans	₩ 3,776,715	₩ 4,564,417
Fair value of plan assets	(3,149,414)	(2,909,547)
Net liabilities incurred from defined benefit plans	₩ 627,301	₩ 1,654,870

Employment Benefits - Net Defin

Employment Benefits - Net Defined Benefit Liability and Asset (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of defined benefit plans [line items]
Beginning balance	₩ 1,654,870
Changes in net defined benefit liability (asset)
Current service cost	496,722	₩ 524,942	₩ 509,520
Remeasurement component	(1,001,118)	(337,298)
Past service cost	125	5,483	(2,027)
Ending balance	627,301	1,654,870
Defined benefit obligation
Disclosure of defined benefit plans [line items]
Beginning balance	4,564,417	4,570,614
Changes in net defined benefit liability (asset)
Current service cost	496,722	524,942
Interest cost	116,256	91,877
Remeasurement component	(1,012,727)	(345,755)
Past service cost	125	5,483
Actual payments	(388,105)	(282,794)
Others	27	50
Ending balance	3,776,715	4,564,417	4,570,614
Plan assets
Disclosure of defined benefit plans [line items]
Beginning balance	2,909,547	2,670,832
Changes in net defined benefit liability (asset)
Interest cost	73,484	52,782
Remeasurement component	(11,609)	(8,457)
Contributions by the employers	347,778	317,707
Actual payments	(169,786)	(123,317)
Ending balance	₩ 3,149,414	₩ 2,909,547	₩ 2,670,832

Employment Benefits - Summary_6

Employment Benefits - Summary of the Fair Value of Plan Assets (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2022	Dec. 31, 2021
Disclosure of fair value of plan assets [abstract]
Equity instruments		₩ 171,301	₩ 344,002
Debt instruments		854,640	744,167
Bank deposits		590,103	407,809
Others	[1]	1,533,370	1,413,569
Plan assets		₩ 3,149,414	₩ 2,909,547
[1]‘Others’ consist of various financial assets managed by external asset management companies.

Employment Benefits - Summary_7

Employment Benefits - Summary of Remeasurement Components Recognized in Other Comprehensive Income (loss) (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Changes in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income [abstract]
Actuarial gain from changes in financial assumptions	₩ (967,366)	₩ (258,194)
Experience adjustments	(45,361)	(87,561)
Expected return	11,609	8,457
Total loss (gain) on remeasurement, net defined benefit liability (asset)	₩ (1,001,118)	₩ (337,298)

Employment Benefits - Additiona

Employment Benefits - Additional Information (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure Of Employment Benefit Obligations [Line Items]
Gain on accumulated remeasurement components	₩ 614,805	₩ 98,844
Return on plan assets	61,875	44,325
Construction In Process And Others
Disclosure Of Employment Benefit Obligations [Line Items]
Employee benefit expense	14,827	13,025	₩ 11,861
Cost of sales
Disclosure Of Employment Benefit Obligations [Line Items]
Employee benefit expense	101,369	71,976	60,587
Selling and administrative expense
Disclosure Of Employment Benefit Obligations [Line Items]
Employee benefit expense	₩ 28,301	₩ 17,144	₩ 9,121

Provisions (Details)

Provisions (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of changes in other provisions
Beginning balance	₩ 25,347,300	₩ 22,527,236
Changes in other provisions
Increase in provision	6,673,486	5,659,564
Payment	(3,043,445)	(2,686,288)
Reversal of unused amount	(66,913)	(93,662)
Others	(118,735)	(59,550)
Ending balance	28,791,693	25,347,300
Current Provisions
Reconciliation of changes in other provisions
Beginning balance	2,845,876
Changes in other provisions
Ending balance	2,427,051	2,845,876
Noncurrent Provisions
Reconciliation of changes in other provisions
Beginning balance	22,501,424
Changes in other provisions
Ending balance	26,364,642	22,501,424
Provisions for employment benefits
Reconciliation of changes in other provisions
Beginning balance	1,048,939	1,024,574
Changes in other provisions
Increase in provision	997,281	1,048,569
Payment	(1,001,283)	(1,024,212)
Reversal of unused amount	0	0
Others	121	8
Ending balance	1,045,058	1,048,939
Provisions for employment benefits | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	1,048,939
Changes in other provisions
Ending balance	1,045,058	1,048,939
Provisions for employment benefits | Noncurrent Provisions
Reconciliation of changes in other provisions
Beginning balance	0
Changes in other provisions
Ending balance	0	0
Litigation provisions
Reconciliation of changes in other provisions
Beginning balance	114,718	113,002
Changes in other provisions
Increase in provision	112,797	67,443
Payment	(39,633)	(44,446)
Reversal of unused amount	(6,360)	(15,763)
Others	(343)	(5,518)
Ending balance	181,179	114,718
Litigation provisions | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	26,269
Changes in other provisions
Ending balance	26,974	26,269
Litigation provisions | Noncurrent Provisions
Reconciliation of changes in other provisions
Beginning balance	88,449
Changes in other provisions
Ending balance	154,205	88,449
Provisions For Nuclear Plants Restoration
Reconciliation of changes in other provisions
Beginning balance	19,461,461	16,974,884
Changes in other provisions
Increase in provision	3,630,830	2,545,803
Payment	(56,813)	(59,226)
Reversal of unused amount	0	0
Others	(51)	0
Ending balance	23,035,427	19,461,461
Provisions For Nuclear Plants Restoration | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	0
Changes in other provisions
Ending balance	0	0
Provisions For Nuclear Plants Restoration | Noncurrent Provisions
Reconciliation of changes in other provisions
Beginning balance	19,461,461
Changes in other provisions
Ending balance	23,035,427	19,461,461
Spent fuel recovery provisions
Reconciliation of changes in other provisions
Beginning balance	1,350,662	1,354,001
Changes in other provisions
Increase in provision	493,943	452,063
Payment	(417,687)	(455,402)
Reversal of unused amount	0	0
Others	0	0
Ending balance	1,426,918	1,350,662
Spent fuel recovery provisions | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	457,466
Changes in other provisions
Ending balance	415,890	457,466
Spent fuel recovery provisions | Noncurrent Provisions
Reconciliation of changes in other provisions
Beginning balance	893,196
Changes in other provisions
Ending balance	1,011,028	893,196
Radioactive waste recovery provisions
Reconciliation of changes in other provisions
Beginning balance	1,832,535	1,891,613
Changes in other provisions
Increase in provision	221,629	3,862
Payment	(64,157)	(51,666)
Reversal of unused amount	0	(11,274)
Others	0	0
Ending balance	1,990,007	1,832,535
Radioactive waste recovery provisions | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	137,342
Changes in other provisions
Ending balance	94,158	137,342
Radioactive waste recovery provisions | Noncurrent Provisions
Reconciliation of changes in other provisions
Beginning balance	1,695,193
Changes in other provisions
Ending balance	1,895,849	1,695,193
PCBs recovery provisions
Reconciliation of changes in other provisions
Beginning balance	103,665	119,019
Changes in other provisions
Increase in provision	1,949	2,182
Payment	(17,156)	(17,408)
Reversal of unused amount	(99)	(128)
Others	0	0
Ending balance	88,359	103,665
PCBs recovery provisions | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	0
Changes in other provisions
Ending balance	0	0
PCBs recovery provisions | Noncurrent Provisions
Reconciliation of changes in other provisions
Beginning balance	103,665
Changes in other provisions
Ending balance	88,359	103,665
Other recovery provisions
Reconciliation of changes in other provisions
Beginning balance	30,231	25,840
Changes in other provisions
Increase in provision	2,093	553
Payment	(165)	(169)
Reversal of unused amount	(751)	0
Others	1,362	4,007
Ending balance	32,770	30,231
Other recovery provisions | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	0
Changes in other provisions
Ending balance	0	0
Other recovery provisions | Noncurrent Provisions
Reconciliation of changes in other provisions
Beginning balance	30,231
Changes in other provisions
Ending balance	32,770	30,231
Power plant regional support program provisions
Reconciliation of changes in other provisions
Beginning balance	146,588	144,272
Changes in other provisions
Increase in provision	52,470	49,596
Payment	(54,554)	(47,280)
Reversal of unused amount	0	0
Others	0	0
Ending balance	144,504	146,588
Power plant regional support program provisions | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	146,588
Changes in other provisions
Ending balance	144,504	146,588
Power plant regional support program provisions | Noncurrent Provisions
Reconciliation of changes in other provisions
Beginning balance	0
Changes in other provisions
Ending balance	0	0
Transmission regional support program provisions
Reconciliation of changes in other provisions
Beginning balance	250,288	96,895
Changes in other provisions
Increase in provision	176,424	306,409
Payment	(187,477)	(153,016)
Reversal of unused amount	0	0
Others	0	0
Ending balance	239,235	250,288
Transmission regional support program provisions | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	250,288
Changes in other provisions
Ending balance	239,235	250,288
Transmission regional support program provisions | Noncurrent Provisions
Reconciliation of changes in other provisions
Beginning balance	0
Changes in other provisions
Ending balance	0	0
Provisions for financial guarantee
Reconciliation of changes in other provisions
Beginning balance	80,841	66,354
Changes in other provisions
Increase in provision	4,738	85,355
Payment	(17,789)	(72,109)
Reversal of unused amount	0	0
Others	(550)	1,241
Ending balance	67,240	80,841
Provisions for financial guarantee | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	21,032
Changes in other provisions
Ending balance	22,895	21,032
Provisions for financial guarantee | Noncurrent Provisions
Reconciliation of changes in other provisions
Beginning balance	59,809
Changes in other provisions
Ending balance	44,345	59,809
Provisions for RPS
Reconciliation of changes in other provisions
Beginning balance	0	9,126
Changes in other provisions
Increase in provision	587,586	445,402
Payment	(556,993)	(430,344)
Reversal of unused amount	(6,254)	(24,184)
Others	0	0
Ending balance	24,339	0
Provisions for RPS | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	0
Changes in other provisions
Ending balance	24,339	0
Provisions for RPS | Noncurrent Provisions
Reconciliation of changes in other provisions
Beginning balance	0
Changes in other provisions
Ending balance	0	0
Provisions for greenhouse gas emissions obligations
Reconciliation of changes in other provisions
Beginning balance	655,544	393,121
Changes in other provisions
Increase in provision	387,299	547,911
Payment	(590,172)	(235,469)
Reversal of unused amount	(33,596)	(2,174)
Others	(120,199)	(47,845)
Ending balance	298,876	655,544
Provisions for greenhouse gas emissions obligations | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	655,544
Changes in other provisions
Ending balance	298,876	655,544
Provisions for greenhouse gas emissions obligations | Noncurrent Provisions
Reconciliation of changes in other provisions
Beginning balance	0
Changes in other provisions
Ending balance	0	0
Others
Reconciliation of changes in other provisions
Beginning balance	271,828	314,535
Changes in other provisions
Increase in provision	4,447	104,416
Payment	(39,566)	(95,541)
Reversal of unused amount	(19,853)	(40,139)
Others	925	(11,443)
Ending balance	217,781	271,828
Others | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	102,408
Changes in other provisions
Ending balance	115,122	102,408
Others | Noncurrent Provisions
Reconciliation of changes in other provisions
Beginning balance	169,420
Changes in other provisions
Ending balance	₩ 102,659	₩ 169,420

Provisions - Summary of Greenho

Provisions - Summary of Greenhouse Gas Emissions Rights Allowances Received Free of Charge from the Government (Detail) - 3rd planned period [Member]	Dec. 31, 2022 kT
Disclosure of Greenhouse Gas Emissions Rights Allowances Received Free of Charge from the Government [Line Items]
Greenhouse Gas Emissions Rights Allowances Received Free of Charge from the Government in Tons Co2 Equivalents	54,514
Period 2021 [Member]
Disclosure of Greenhouse Gas Emissions Rights Allowances Received Free of Charge from the Government [Line Items]
Greenhouse Gas Emissions Rights Allowances Received Free of Charge from the Government in Tons Co2 Equivalents	15,085
Period 2022 [Member]
Disclosure of Greenhouse Gas Emissions Rights Allowances Received Free of Charge from the Government [Line Items]
Greenhouse Gas Emissions Rights Allowances Received Free of Charge from the Government in Tons Co2 Equivalents	14,789
Period 2023 [Member]
Disclosure of Greenhouse Gas Emissions Rights Allowances Received Free of Charge from the Government [Line Items]
Greenhouse Gas Emissions Rights Allowances Received Free of Charge from the Government in Tons Co2 Equivalents	14,784
Period 2024 [Member]
Disclosure of Greenhouse Gas Emissions Rights Allowances Received Free of Charge from the Government [Line Items]
Greenhouse Gas Emissions Rights Allowances Received Free of Charge from the Government in Tons Co2 Equivalents	4,928
Period 2025 [Member]
Disclosure of Greenhouse Gas Emissions Rights Allowances Received Free of Charge from the Government [Line Items]
Greenhouse Gas Emissions Rights Allowances Received Free of Charge from the Government in Tons Co2 Equivalents	4,928

Provisions - Summary of Changes

Provisions - Summary of Changes in Greenhouse Gas Emissions Rights (Detail) ₩ in Millions		12 Months Ended
		Dec. 31, 2022 KRW (₩) kT		Dec. 31, 2021 KRW (₩) kT
2nd planned period [Member] | Period 2020 [Member]
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Line Items]
Quantity Beginning		0		17,905
Purchase (Sell)				433
Government submission				(17,560)
Borrowing (carryforward)				(539)
Others				(239)
Quantity Ending				0
Balance Beginning | ₩		₩ 0		₩ 357,355
Purchase (Sell) | ₩				95,375
Government submission | ₩				(280,924)
Borrowing (carryforward) | ₩				(113,014)
Others | ₩				(58,792)
Balance Ending | ₩				₩ 0
3rd planned period [Member]
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Line Items]
Quantity Beginning		60,003		58,137
Adjusted Quantity Beginning	[1]	49,908
Purchase (Sell)		2,601		1,227
Government submission		(18,440)		0
Borrowing (carryforward)		334		639
Others		0		0
Quantity Ending		34,403		60,003
Balance Beginning | ₩		₩ 602,795	[1]	₩ 38,338
Purchase (Sell) | ₩		553,757		429,747
Government submission | ₩		(753,707)		0
Borrowing (carryforward) | ₩		60,473		134,710
Others | ₩		(227,352)		0
Balance Ending | ₩		₩ 235,966		₩ 602,795	[1]
3rd planned period [Member] | Period 2021 [Member]
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Line Items]
Quantity Beginning		17,829		16,051
Adjusted Quantity Beginning	[1]	16,433
Purchase (Sell)		1,191		1,426
Government submission		(17,602)		0
Borrowing (carryforward)		(22)		352
Others		0		0
Quantity Ending		0		17,829
Balance Beginning | ₩		₩ 524,658	[1]	₩ 38,338
Purchase (Sell) | ₩		267,433		410,099
Government submission | ₩		(580,807)		0
Borrowing (carryforward) | ₩		(3,298)		76,221
Others | ₩		(207,986)		0
Balance Ending | ₩		₩ 0		₩ 524,658	[1]
3rd planned period [Member] | Period 2022 [Member]
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Line Items]
Quantity Beginning		16,028		15,782
Adjusted Quantity Beginning	[1]	14,942
Purchase (Sell)		1,343		(31)
Government submission		(838)		0
Borrowing (carryforward)		286		277
Others		0		0
Quantity Ending		15,733		16,028
Balance Beginning | ₩		₩ 62,735	[1]	₩ 0
Purchase (Sell) | ₩		272,824		7,296
Government submission | ₩		(173,145)		0
Borrowing (carryforward) | ₩		45,847		55,439
Others | ₩		(16,256)		0
Balance Ending | ₩		₩ 192,005		₩ 62,735	[1]
3rd planned period [Member] | Period 2023 [Member]
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Line Items]
Quantity Beginning		15,749		15,782
Adjusted Quantity Beginning	[1]	11,166
Purchase (Sell)		32		(43)
Government submission		0		0
Borrowing (carryforward)		48		10
Others		0		0
Quantity Ending		11,246		15,749
Balance Beginning | ₩		₩ 8,529	[1]	₩ 0
Purchase (Sell) | ₩		6,315		5,479
Government submission | ₩		245		0
Borrowing (carryforward) | ₩		12,225		3,050
Others | ₩		(8,529)		0
Balance Ending | ₩		₩ 18,785		₩ 8,529	[1]
3rd planned period [Member] | Period 2024 [Member]
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Line Items]
Quantity Beginning		5,186		5,261
Adjusted Quantity Beginning	[1]	3,671
Purchase (Sell)		35		(75)
Government submission		0		0
Borrowing (carryforward)		22		0
Others		0		0
Quantity Ending		3,728		5,186
Balance Beginning | ₩		₩ 0	[1]	₩ 0
Purchase (Sell) | ₩		7,185		0
Government submission | ₩		0		0
Borrowing (carryforward) | ₩		5,699		0
Others | ₩		0		0
Balance Ending | ₩		₩ 12,884		₩ 0	[1]
3rd planned period [Member] | Period 2025 [Member]
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Line Items]
Quantity Beginning		5,211		5,261
Adjusted Quantity Beginning	[1]	3,696
Purchase (Sell)		0		(50)
Government submission		0		0
Borrowing (carryforward)		0		0
Others		0		0
Quantity Ending		3,696		5,211
Balance Beginning | ₩		₩ 6,873	[1]	₩ 0
Purchase (Sell) | ₩		0		6,873
Government submission | ₩		0		0
Borrowing (carryforward) | ₩		0		0
Others | ₩		5,419		0
Balance Ending | ₩		₩ 12,292		₩ 6,873	[1]
[1]Changes such as additional allowances or cancellation of allowances are reflected.

Provisions - Summary of Chang_2

Provisions - Summary of Changes in greenhouse gas emissions rights (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2022 kT
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Abstract]
Estimated greenhouse gas emission	13,167

Government Grants - Summary of

Government Grants - Summary of Changes in Government Grants (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Changes in government grants
Beginning balance	₩ (512,747)	₩ (511,210)
Receipt	(50,755)	(37,920)
Acquisitions	23,155	5,001
Offset the items of depreciation expense and others	34,931	34,482
Disposals	1,673	2,343
Others	(17,358)	(5,443)
Ending balance	(521,101)	(512,747)
Cash
Changes in government grants
Beginning balance	0	0
Receipt	(50,755)	(37,920)
Acquisitions	0	0
Offset the items of depreciation expense and others	0	0
Disposals	0	0
Others	50,755	37,920
Ending balance	0	0
Land
Changes in government grants
Beginning balance	(23,474)	(23,475)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	0	0
Disposals	1	1
Others	(3,932)	0
Ending balance	(27,405)	(23,474)
Buildings
Changes in government grants
Beginning balance	(52,122)	(57,231)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	5,360	5,174
Disposals	0	0
Others	(3,675)	(65)
Ending balance	(50,437)	(52,122)
Structures
Changes in government grants
Beginning balance	(172,021)	(180,009)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	9,568	9,517
Disposals	1,250	1,811
Others	(4,405)	(3,340)
Ending balance	(165,608)	(172,021)
Machinery
Changes in government grants
Beginning balance	(140,082)	(157,785)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	17,283	17,519
Disposals	405	531
Others	(4,732)	(347)
Ending balance	(127,126)	(140,082)
Vehicles
Changes in government grants
Beginning balance	(1,675)	(632)
Receipt	0	0
Acquisitions	0	(26)
Offset the items of depreciation expense and others	663	460
Disposals	0	0
Others	(1,033)	(1,477)
Ending balance	(2,045)	(1,675)
Equipment
Changes in government grants
Beginning balance	(149)	(227)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	494	95
Disposals	0	0
Others	(6,953)	(17)
Ending balance	(6,608)	(149)
Construction in progress
Changes in government grants
Beginning balance	(111,822)	(79,126)
Receipt	0	0
Acquisitions	23,155	5,027
Offset the items of depreciation expense and others	0	0
Disposals	17	0
Others	(47,276)	(37,723)
Ending balance	(135,926)	(111,822)
Investment properties
Changes in government grants
Beginning balance	(30)	(29)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	1	1
Disposals	0	0
Others	8	(2)
Ending balance	(21)	(30)
Software
Changes in government grants
Beginning balance	(91)	(136)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	60	64
Disposals	0	0
Others	(143)	(19)
Ending balance	(174)	(91)
Development expenditures
Changes in government grants
Beginning balance	(3,820)	(5,043)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	1,466	1,439
Disposals	0	0
Others	(1,123)	(216)
Ending balance	(3,477)	(3,820)
Intangible assets under development
Changes in government grants
Beginning balance	(7,326)	(7,203)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	0	0
Disposals	0	0
Others	5,218	(123)
Ending balance	(2,108)	(7,326)
Others
Changes in government grants
Beginning balance	(71)	(75)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	4	4
Disposals	0	0
Others	0	0
Ending balance	(67)	(71)
Tools
Changes in government grants
Beginning balance	(64)	(239)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	32	209
Disposals	0	0
Others	(67)	(34)
Ending balance	₩ (99)	₩ (64)

Government Grants - Summary o_2

Government Grants - Summary of Changes in Government Grants for Specific Business Projects (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disclosure of Detailed Information About Changes in Government Grants for Specific Business Projects [Line Items]
Beginning balance	₩ 512,747	₩ 511,210
Ending Balance	₩ 521,101	₩ 512,747
Temporary electricity bill support for small business owners
Disclosure of Detailed Information About Changes in Government Grants for Specific Business Projects [Line Items]
Department	Ministry of Trade, Industry and Energy	Ministry of Trade, Industry and Energy
Business Name	Temporary electricity bill support for small business owners	Temporary electricity bill support for small business owners
Description	Temporary electricity bill support for small business owners	Temporary electricity bill support for small business owners
Period	2021.04.01 ~2022.06.30	2021.04.01 ~2022.06.30
Budget	₩ 211,235	₩ 211,235
Beginning balance	17,735	748
Self- Payment, Contribution	0	0
Local Government, Contribution	0	0
Subsidies, Contribution	71,685	139,550
Self-Payment, Interests	0	0
Local Government, Interests	0	0
Subsidies, Interests	0	0
Self- Payment, Execution	0	0
Local Government, Execution	0	0
Subsidies, Execution	(88,300)	(122,563)
Self- Payment, Return	0	0
Local Government, Return	0	0
Subsidies, Return	0	0
Others	0	0
Ending Balance	₩ 1,120	₩ 17,735

Deferred Revenues (Details)

Deferred Revenues (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Deferred income including contract liabilities [abstract]
Deferred Revenue, Beginning Balance	₩ 10,356,555	₩ 9,868,189
Increase	1,330,129	1,149,578
Recognized as revenue	(711,839)	(661,212)
Deferred Revenue, Ending Balance	₩ 10,974,845	₩ 10,356,555

Non-financial Liabilities (Deta

Non-financial Liabilities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Miscellaneous liabilities [abstract]
Advance received, Current	₩ 4,544,206	₩ 4,157,916
Unearned revenue, Current	86,584	40,187
Deferred revenue, Current	702,430	659,397
Withholdings, Current	207,217	345,892
Others. Current	1,433,940	1,262,941
Non-financial liabilities, Current	6,974,377	6,466,333
Advance received, Non-current	284,618	398,056
Unearned revenue, Non-current	7,200	6,517
Deferred revenue, Non-current	10,272,415	9,697,158
Withholdings, Non-current	2,408	5,171
Others, Non-current	96,020	109,462
Non-financial liabilities, Non-current	₩ 10,662,661	₩ 10,216,364

Contributed Capital - Summary o

Contributed Capital - Summary of Details Shares Issued (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2022	Dec. 31, 2021
Disclosure of classes of share capital [line items]
Common shares		₩ 3,209,820	₩ 3,209,820
Owned by government
Disclosure of classes of share capital [line items]
Common shares	[1]	1,640,385	1,640,385
Owned by others
Disclosure of classes of share capital [line items]
Common shares		₩ 1,569,435	₩ 1,569,435
[1]Korea Development Bank’s interest of ￦1,056,176 million is included.

Contributed Capital - Summary_2

Contributed Capital - Summary of Details of Shares Issued (Parentheticals) (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2022	Dec. 31, 2021
Common stock issued capital		₩ 3,209,820	₩ 3,209,820
Share Capital Owned By Government
Common stock issued capital	[1]	1,640,385	1,640,385
Korean Development Bank [Member] | Share Capital Owned By Government
Common stock issued capital		₩ 1,056,176	₩ 1,056,176
[1]Korea Development Bank’s interest of ￦1,056,176 million is included.

Contributed Capital - Summary_3

Contributed Capital - Summary of Details in Number of Outstanding Capital Stock (Details) - ₩ / shares	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of classes of share capital [line items]
Number of shares outstanding	641,964,077	641,964,077	641,964,077
Ordinary shares [member]
Disclosure of classes of share capital [line items]
Shares authorized	1,200,000,000	1,200,000,000
Shares issued	641,964,077	641,964,077
Par value per share	₩ 5,000	₩ 5,000
Number of shares outstanding	641,964,077	641,964,077

Contributed Capital - Summary_4

Contributed Capital - Summary of Share Premium (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Share Premium [Abstract]
Share premium	₩ 843,758	₩ 843,758

Retained Earnings and Dividen_3

Retained Earnings and Dividends Paid - Summary of Retained Earnings (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2022	Dec. 31, 2021
Retained earnings [abstract]
Legal reserves	[1]	₩ 1,604,910	₩ 1,604,910
Voluntary reserves		27,782,969	33,282,817
Retained earnings (Undisposed deficit) before appropriations		(7,956,579)	10,370,517
Retained earnings		21,431,300	45,258,244
Voluntary reserves
Reserve for investment on social overhead capital		5,277,449	5,277,449
Reserve for research and human development	[2]	330,000	330,000
Reserve for business expansion		21,965,520	27,465,368
Reserve for equalizing dividends		₩ 210,000	₩ 210,000
[1]The KEPCO Act requires KEPCO to appropriate a legal reserve equal to at least 20 percent of net income for each accounting period until the reserve equals 50 percent of KEPCO’s common stock. The legal reserve is not available for cash dividends; however, this reserve may be credited to paid-in

Retained Earnings and Dividen_4

Retained Earnings and Dividends Paid - Summary of Changes in Retained Earnings (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Beginning balance	₩ 45,258,244
Loss for the year attributed to owners of the controlling company	(24,466,853)	₩ (5,304,522)	₩ 1,992,077
Changes in equity method retained earnings
Changes	1,310,391	494,584	281,107
Remeasurements of defined benefit liability, net of tax	663,095	210,409	(69,804)
Additional paid-in capital and others	126,792	75,211	(5,445)
Ending balance	21,431,300	45,258,244
Equity attributable to owners of parent [member]
Changes in equity method retained earnings
Additional paid-in capital and others	40,476	(491)	(148)
Retained earnings [member]
Beginning balance	45,258,244	51,134,330
Loss for the year attributed to owners of the controlling company	(24,466,853)	(5,304,522)
Changes in equity method retained earnings
Beginning balance	3,970	361
Changes	12,305	3,609
Ending balance	16,275	3,970	361
Remeasurements of defined benefit liability, net of tax	626,769	201,067
Transfer of gain or loss on valuation of financial assets at FVOCI	0	4,388
Dividend paid	0	(780,628)
Additional paid-in capital and others	835	0	0
Ending balance	₩ 21,431,300	₩ 45,258,244	₩ 51,134,330

Retained Earnings and Dividen_5

Retained Earnings and Dividends Paid - Summary of Dividends Paid (Details) - KRW (₩) ₩ / shares in Units, ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Dividends [Abstract]
Number of shares issued	641,964,077	641,964,077	641,964,077
Number of treasury stocks	0	0	0
Number of shares eligible for dividends	641,964,077	641,964,077	641,964,077
Dividends paid per share (In won)	₩ 0	₩ 1,216	₩ 0
Dividends paid, ordinary shares	₩ 0	₩ 780,628	₩ 0

Retained Earnings and Dividen_6

Retained Earnings and Dividends Paid - Summary of Changes in Reserve of Remeasurement (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans [abstract]
Beginning balance	₩ 98,844	₩ (169,234)
Changes	964,791	327,957
Income tax effect	(338,022)	(126,890)
Transfer to reserve for business expansion	(110,808)	67,011
Ending balance	₩ 614,805	₩ 98,844

Statements of Appropriation o_3

Statements of Appropriation of Retained Earnings (Disposition of Deficit) (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Appropriation of Retained Earnings [Line Items]
Undisposed deficit carried over from prior years	₩ 10,370,517
Net loss	(24,429,108)	₩ (5,215,581)	₩ 2,093,683
Remeasurement of the defined benefit plan	663,095	210,409	₩ (69,804)
Separate [member]
Statement of Appropriation of Retained Earnings [Line Items]
Undisposed deficit carried over from prior years	0	0
Net loss	(25,297,713)	(5,607,732)
Remeasurement of the defined benefit plan	327,056	107,884
Retained earnings before appropriations	(24,970,657)	(5,499,848)
Transfer from voluntary reserves	24,970,657	5,499,848
Subtotal (I+II)	0	0
Undisposed deficit to be carried over forward to subsequent year	₩ 0	₩ 0

Hybrid bond (Details)

Hybrid bond (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Hybrid Bond [Line Items]
Amount		₩ 229,373	₩ 398,910
Korea South-East Power Co., Ltd. | 1st bond-type hybrid bond
Hybrid Bond [Line Items]
Issue date	[1]	Dec. 07, 2012
Maturity date	[1]	Dec. 06, 2042
Yield (%)	[1]	4.38%
Amount	[1]	₩ 0	170,000
Korea South-East Power Co., Ltd. | 2nd bond-type hybrid bond
Hybrid Bond [Line Items]
Issue date	[2]	Dec. 07, 2012
Maturity date	[2]	Dec. 06, 2042
Yield (%)	[2]	4.44%
Amount	[2]	₩ 230,000	230,000
Expense of issuance
Hybrid Bond [Line Items]
Amount		₩ (627)	₩ (1,090)
[1]The call option was exercised for the 1st hybrid bond during the current period.[2]Bondholders may not require prepayment in any case, and the Company has a call option to repay all of these bonds on or after 12 years from the date of issuance of the bonds, or on each interest payment date henceforth. In addition, there is a step-up clause from the date of the initial call option exercise. Although these instruments have contractual maturity dates, the contractual agreements allow these subsidiaries to indefinitely extend the maturity dates and defer the payment of interest without modification to the other terms of the instruments. When the Company decides not to pay dividends on common shares, they are not required to pay interest on the hybrid bonds.

Hybrid bond (Parentheticals) (D

Hybrid bond (Parentheticals) (Details)	12 Months Ended
	Dec. 31, 2022
Hybrid Bonds [Abstract]
Hybrid Bonds, Repayment Term	12 years

Other Components of Equity - Su

Other Components of Equity - Summary of Other Components of Equity (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Beginning balance	₩ 65,326,706	₩ 70,668,059	₩ 68,889,649
Additional paid-in capital and others	126,792	75,211	(5,445)
Shares in other comprehensive Income(loss) of associates and joint ventures, net of tax	12,305	3,609	3,181
Share of other comprehensive income of associates and joint ventures accounted for using equity method that will be reclassified to profit or loss, net of tax	509,487	301,161	(132,805)
Foreign currency translation of foreign operations, net of tax	28,387	41,189	(76,442)
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax	(24,415)	(15,778)	64,562
Ending balance	42,000,256	65,326,706	70,668,059
Other Components Of Equity
Beginning balance	14,468,450
Ending balance	15,060,518	14,468,450
Other capital surplus
Beginning balance	1,231,109	1,224,105
Changes in consolidation scope	(597)	43
Additional paid-in capital and others	39,641	(491)
Transactions between consolidated entities	(1,584)	7,452
Ending balance	1,268,569	1,231,109	1,224,105
Other capital surplus | Other Components Of Equity
Beginning balance	1,231,109
Ending balance	1,268,569	1,231,109
Gains on disposal of Treasury stocks
Beginning balance	387,524	387,524
Changes in consolidation scope	0	0
Additional paid-in capital and others	0	0
Transactions between consolidated entities	0	0
Ending balance	387,524	387,524	387,524
Other Capital Surplus Other Than Gainson Disposal Of Treasury Stocks
Beginning balance	843,585	836,581
Changes in consolidation scope	(597)	43
Additional paid-in capital and others	39,641	(491)
Transactions between consolidated entities	(1,584)	7,452
Ending balance	881,045	843,585	836,581
Accumulated other comprehensive income (loss)
Beginning balance	(57,632)	(409,577)
Changes in the unrealized fair value of financial assets at FVOCI, net of tax	58,008	59,022
Share of other comprehensive income of associates and joint ventures accounted for using equity method that will be reclassified to profit or loss, net of tax	509,487	301,161
Foreign currency translation of foreign operations, net of tax	19,550	15,760
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax	(32,437)	(19,610)
Others		(4,388)
Ending balance	496,976	(57,632)	(409,577)
Accumulated other comprehensive income (loss) | Other Components Of Equity
Beginning balance	(57,632)
Ending balance	496,976	(57,632)
Financial assets at fair value through other comprehensive income
Beginning balance	(46,498)	(101,132)
Changes in the unrealized fair value of financial assets at FVOCI, net of tax	58,008	59,022
Shares in other comprehensive Income(loss) of associates and joint ventures, net of tax	0	0
Foreign currency translation of foreign operations, net of tax	0	0
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax	0	0
Others		(4,388)
Ending balance	11,510	(46,498)	(101,132)
Shares in other comprehensive Income (loss) of investments in associates and joint ventures
Beginning balance	311,252	10,091
Changes in the unrealized fair value of financial assets at FVOCI, net of tax	0	0
Shares in other comprehensive Income(loss) of associates and joint ventures, net of tax	509,487	301,161
Foreign currency translation of foreign operations, net of tax	0	0
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax	0	0
Others		0
Ending balance	820,739	311,252	10,091
Reserve for gain (loss) on valuation of derivatives
Beginning balance	2,784	22,394
Changes in the unrealized fair value of financial assets at FVOCI, net of tax	0	0
Shares in other comprehensive Income(loss) of associates and joint ventures, net of tax	0	0
Foreign currency translation of foreign operations, net of tax	0	0
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax	(32,437)	(19,610)
Others		0
Ending balance	(29,653)	2,784	22,394
Reserve for overseas operations translation credit
Beginning balance	(325,170)	(340,930)
Changes in the unrealized fair value of financial assets at FVOCI, net of tax	0	0
Shares in other comprehensive Income(loss) of associates and joint ventures, net of tax	0	0
Foreign currency translation of foreign operations, net of tax	19,550	15,760
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax	0	0
Others		0
Ending balance	(305,620)	(325,170)	₩ (340,930)
Other equity
Beginning balance	13,294,973
Ending balance	13,294,973	13,294,973
Other equity | Other Components Of Equity
Beginning balance	13,294,973
Ending balance	13,294,973	13,294,973
Statutory revaluation reserve
Beginning balance	13,295,098
Ending balance	13,295,098	13,295,098
Changes in other equity
Beginning balance	(125)
Ending balance	₩ (125)	₩ (125)

Sales - Summary of Sales (Detai

Sales - Summary of Sales (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of performance obligations [line items]
Sales of goods		₩ 69,184,469	₩ 58,800,977	₩ 56,685,109
Sales related to rendering of services		714,602	456,400	429,350
Sales related to construction services		646,953	754,998	812,175
Total revenue from external customers (Notes 2,4, 35, 45, 47)		70,546,024	60,012,375	57,926,634
Domestic
Disclosure of performance obligations [line items]
Sales of goods		68,578,390	58,359,774	56,381,405
Sales related to rendering of services		370,799	252,216	223,075
Sales related to construction services		193,541	159,262	170,895
Total revenue from external customers (Notes 2,4, 35, 45, 47)		69,142,730	58,771,252	56,775,375
Domestic | Electricity
Disclosure of performance obligations [line items]
Sales of goods		66,198,964	57,308,555	55,731,782
Domestic | Heat Supply
Disclosure of performance obligations [line items]
Sales of goods		489,629	232,738	198,715
Domestic | Others
Disclosure of performance obligations [line items]
Sales of goods		1,889,797	818,481	450,908
Domestic | Performance obligations satisfied at point in time
Disclosure of performance obligations [line items]
Total revenue from external customers (Notes 2,4, 35, 45, 47)		68,578,390	58,359,774	56,381,405
Domestic | Performance obligations satisfied over time
Disclosure of performance obligations [line items]
Total revenue from external customers (Notes 2,4, 35, 45, 47)		564,340	411,478	393,970
Overseas
Disclosure of performance obligations [line items]
Sales of goods		606,079	441,203	303,704
Sales related to rendering of services		343,803	204,184	206,275
Sales related to construction services		453,412	595,736	641,280
Total revenue from external customers (Notes 2,4, 35, 45, 47)	[1]	1,403,294	1,241,123	1,151,259
Overseas | Electricity
Disclosure of performance obligations [line items]
Sales of goods		0	0	0
Overseas | Heat Supply
Disclosure of performance obligations [line items]
Sales of goods		0	0	0
Overseas | Others
Disclosure of performance obligations [line items]
Sales of goods		606,079	441,203	303,704
Overseas | Performance obligations satisfied at point in time
Disclosure of performance obligations [line items]
Total revenue from external customers (Notes 2,4, 35, 45, 47)		606,079	441,203	303,704
Overseas | Performance obligations satisfied over time
Disclosure of performance obligations [line items]
Total revenue from external customers (Notes 2,4, 35, 45, 47)		₩ 797,215	₩ 799,920	₩ 847,555
[1]Middle East and other Asian countries make up the majority of overseas revenue and non-current non-current

Selling and Administrative Ex_3

Selling and Administrative Expenses - Summary of Selling and Administrative Expenses (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of attribution of expenses by nature to their function [line items]
Salaries	₩ 5,471,459	₩ 5,397,682	₩ 5,278,637
Welfare and benefit expense	695,839	725,998	639,390
Insurance expense	127,507	122,453	103,308
Depreciation	12,301,131	11,771,324	11,369,496
Amortization of intangible assets	156,160	166,161	170,466
Bad debt expense	23,634	17,968	20,648
Commission	771,947	717,559	744,322
Advertising expense	44,291	38,782	37,720
Training expense	22,140	18,206	18,108
Vehicle maintenance expense	21,024	17,001	16,596
Publishing expense	6,746	6,878	7,201
Business promotion expense	6,538	7,299	7,334
Rent expense	234,119	237,884	227,410
Telecommunication expense	17,622	19,528	18,647
Transportation expense	114,857	54,235	11,369
Taxes and dues	676,497	622,826	555,031
Expendable supplies expense	56,776	50,466	44,995
Water, light and heating expense	77,952	55,376	42,958
Repairs and maintenance expense	2,739,424	2,617,995	2,544,901
Ordinary development expense	727,810	689,397	700,642
Travel expense	95,061	78,202	71,689
Clothing expense	21,822	18,534	22,950
Survey and analysis expense	5,448	4,881	4,572
Membership fee	18,381	9,823	14,404
Disclosure - Other selling and administrative expenses
General and administrative expenses	3,009,422	2,875,796	2,678,443
Selling and administrative expense
Disclosure of attribution of expenses by nature to their function [line items]
Salaries	1,142,360	1,121,188	1,095,183
Retirement benefit expense	109,758	113,127	103,967
Welfare and benefit expense	155,781	155,558	155,071
Insurance expense	20,835	17,909	10,178
Depreciation	244,676	219,427	218,103
Amortization of intangible assets	85,661	91,428	87,086
Bad debt expense	23,634	17,968	20,648
Commission	420,390	410,287	368,275
Advertising expense	33,739	29,230	29,559
Training expense	7,327	4,923	5,196
Vehicle maintenance expense	10,749	8,849	9,435
Publishing expense	3,732	3,568	3,677
Business promotion expense	3,198	3,522	3,614
Rent expense	47,680	43,650	36,337
Telecommunication expense	7,945	8,569	8,686
Transportation expense	1,012	870	1,007
Taxes and dues	122,177	93,446	62,828
Expendable supplies expense	9,617	9,052	8,029
Water, light and heating expense	17,950	12,351	11,749
Repairs and maintenance expense	152,449	123,134	79,185
Ordinary development expense	213,932	213,936	197,436
Travel expense	16,062	11,099	10,793
Clothing expense	13,044	10,540	14,834
Survey and analysis expense	1,126	889	826
Membership fee	1,469	1,331	1,274
Disclosure - Other selling and administrative expenses
Accommodation development expenses	56,038	57,815	30,889
Miscellaneous wages	31,910	47,221	45,887
Litigation and filing expenses	14,876	16,383	19,341
Compensation for damages	3,116	3,303	8,374
Outsourcing expenses	3,635	3,799	3,610
Reward expenses	2,740	3,006	3,228
Overseas market development expenses	1,376	1,192	1,218
Others	29,428	17,226	22,920
Others	143,119	149,945	135,467
General and administrative expenses	₩ 3,009,422	₩ 2,875,796	₩ 2,678,443

Other Income and Expense (Detai

Other Income and Expense (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Other non-operating income [Abstract]
Reversal of other provisions	₩ 15,265	₩ 15,548	₩ 25,826
Reversal of other allowance for doubtful accounts	37	98	2,465
Gains on government grants	301	458	269
Gains on assets contributed	1,953	9,347	24,324
Gains on liabilities exempted	1,181	1,830	1,314
Compensation and reparations revenue	89,638	104,826	95,407
Revenue from foundation fund	3	1	0
Revenue from research contracts	8,191	5,996	4,001
Income related to transfer of assets from customers	711,839	661,212	643,477
Rental income	208,064	204,123	193,567
Others of Other Income	59,017	30,694	45,798
Refund of claim for rectification	701	7,274	11,880
Adjustment of research project	0	7,638	2,150
Maintenance expenses on lease building	125	160	2,785
Training expenses	1,684	1,739	3,852
Deposit redemption	12	378	314
Reversal of expenses on litigation	1,920	991	620
Revenue on royalty fee	455	173	0
Reimbursement of insurance fee	0	1	22
Gains on guarantee contracts	22	27	134
Miscellaneous other non-operating income	54,098	12,313	24,041
Other nonoperating income	1,095,489	1,034,133	1,036,448
Other non-operating expense
Compensation and indemnification expense	36	663	11,959
Accretion expenses of other provisions	1,138	2,711	17,991
Depreciation expenses on investment properties	486	1,386	1,453
Depreciation expenses on idle assets	3,635	3,621	6,604
Other bad debt expense	6,400	49,372	32,503
Donations	131,037	152,456	316,981
Others of Other Expense	69,418	47,723	30,229
Operating expenses related to the idle assets	1,683	44	46
Research grants	562	109	91
Expenses related to farming and fishing village supports	11,272	17,065	16,115
Expenses related to Operating of a fitness center	8,370	6,948	5,101
Expenses on adjustment of research and development grants	260	2,241	720
Taxes and dues	31,985	119	253
Expenses on R&D supports	48	861	242
Miscellaneous other non-operating expense	15,238	20,336	7,661
Other Nonoperating Expense	₩ 212,150	₩ 257,932	₩ 417,720

Other Gains (Losses) (Details)

Other Gains (Losses) (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Other gains
Gains on disposal of property, plant and equipment	₩ 148,667	₩ 56,284	₩ 93,195
Gains on disposal of inventories	11,091	4,446	3,373
Gains on disposal of intangible assets	41	1	1,556
Reversal of impairment loss on property, plant and equipment	134,735	0	7,805
Reversal of impairment loss on intangible assets	0	14	0
Gains on proxy collection of TV license fee	42,286	42,271	41,438
Gains on foreign currency translation	36,097	20,598	8,917
Gains on foreign currency transaction	235,221	48,671	61,865
Gains on insurance proceeds	43,497	144	43,800
Miscellaneous Other Gains	294,091	250,174	322,379
Gains on compensation of impaired electric poles	768	812	978
Gains on harbor facilities dues	4,198	3,281	2,231
Gains on technical fees	2,972	3,968	4,826
Reversal of occupation development training fees	525	229	352
Gains on disposal of waste	7,749	4,272	6,927
Gains on insurance	0	690	0
Gains on tax rebate	548	685	772
Gains on other commission	2,097	1,822	1,643
Gains on disposal of assets held-for-sale	236	160	0
Others of Miscellaneous Other Gains	221,621	178,799	259,839
Gains on disposal of greenhouse gas emissions rights	0	8,739	0
Other losses
Losses on disposal of property, plant and equipment	(100,066)	(92,622)	(162,725)
Losses on disposal of intangible assets	(116)	(145)	(392)
Losses on valuation of other non-current assets	0	0	(241)
Impairment loss on property, plant and equipment	(37,311)	(4,056)	(80,413)
Impairment loss on intangible assets	(164)	0	(3,599)
Impairment loss on other non-current assets	0	(16,035)	0
Losses on foreign currency translation	(14,738)	(4,732)	(17,664)
Losses on foreign currency transaction	(299,117)	(67,990)	(49,694)
Miscellaneous Other Losses	(197,715)	(181,787)	(189,695)
Losses on valuation of inventories	14,528	7,761	4,998
Losses on disposal of inventories	8,324	8,874	37,644
Losses due to disaster	5,068	6,238	16,814
Losses on rounding adjustment of electric charge surtax	1,317	1,283	1,276
Others of miscellaneous other losses	168,478	146,349	128,963
Loss on disposal of greenhouse gas emissions rights	0	11,282	0
Total miscellaneous other losses	197,715	181,787	189,695
Net other gains	₩ 243,122	₩ 8,519	₩ 35,094

Finance Income - Summary of Fin

Finance Income - Summary of Finance Income and Interest Income (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Interest Income
Cash and cash equivalents	₩ 51,872	₩ 12,692	₩ 9,419
Financial assets at fair value through profit or loss	58,540	18,415	19,114
Financial assets at amortized cost	1,308	797	612
Loans	33,545	25,196	26,232
Short-term financial instruments	15,827	7,531	25,540
Long-term financial instruments	14,371	12,470	10,406
Other financial assets	637	230	228
Trade and other receivables	164,653	144,543	151,035
Total Interest Income	340,753	221,874	242,586
Dividend income	28,875	10,522	7,316
Gains on disposal of financial assets	11,199	7,718	11,992
Gains on valuation of financial assets at fair value through profit or loss	7,099	14,338	12,904
Gains on valuation of derivatives	595,256	860,011	57,563
Gains on transaction of derivatives	429,847	124,900	146,448
Gains on foreign currency translation	389,361	146,349	1,005,961
Gains on foreign currency transactions	29,997	15,618	24,009
Other financial income	925	1,284	1,470
Total Finance Income	₩ 1,833,312	₩ 1,402,614	₩ 1,510,249

Finance Expenses - Summary of F

Finance Expenses - Summary of Finance Expenses and Interest Expense (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Interest costs [abstract]
Trade and other payables	₩ 204,078	₩ 213,765	₩ 88,757
Short-term borrowings	145,201	42,371	29,358
Long-term borrowings	204,037	115,141	118,678
Debt securities	2,388,517	1,728,588	1,805,253
Other financial liabilities	472,248	384,423	540,867
Interest expense (before capitalizing borrowing costs)	3,414,081	2,484,288	2,582,913
Less: Capitalized borrowing costs	(595,535)	(569,831)	(587,488)
Interest expense	2,818,546	1,914,457	1,995,425
Losses on sale of financial assets	1,841	1,045	648
Losses on valuation of financial assets at fair value through profit or loss	44,329	5,480	7,396
Losses on valuation of derivatives	371,038	37,017	513,278
Losses on transaction of derivatives	205,162	40,818	81,055
Losses on foreign currency transaction	346,711	83,558	79,103
Losses on foreign currency translation	934,005	1,159,334	215,047
Losses on repayment of financial liabilities	15	10	35
Others	25,144	4,058	4,456
Total Finance Expense	₩ 4,746,791	₩ 3,245,777	₩ 2,896,443

Finance Expenses - Additional I

Finance Expenses - Additional Information (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Minimum
Borrowing costs [abstract]
Capitalization rates	2.25%	2.02%	2.14%
Maximum
Borrowing costs [abstract]
Capitalization rates	3.86%	4.33%	4.84%

Income Taxes - Summary of Incom

Income Taxes - Summary of Income Tax Expense (Benefit) (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income tax expense (benefit) [Abstract]
Payment of income tax	₩ 563,681	₩ 357,767	₩ 671,179
Adjustment in respect of prior years due to change in estimate	48,374	153,113	(63,756)
Current income tax directly recognized in equity	(350,348)	(198,714)	51,486
Current income tax expense	261,707	312,166	658,909
Changes of unrecognized tax losses, tax credit and temporary differences for prior periods	(9,676,218)	(2,168,155)	240,155
Generation and realization of temporary differences	(564,801)	(489,411)	(77,985)
Reclassified from equity to profit(loss)	(4,964)	0	0
Changes of unrecognized tax losses, tax credit and temporary differences for prior periods	(38,708)	(43,653)	(10,471)
Changes in deferred tax on tax losses carryforwards	(9,175,755)	(1,641,823)	296,070
Tax credit carryforwards	34,019	(12,199)	32,541
Amount due to change in tax rate or regulations	73,991	18,931	0
Income tax expense (benefit)	(9,414,511)	(1,855,989)	899,064
Dividends of hybrid bond	4,149	4,736	4,273
Disposal of subsidiaries	406	0	0
Income tax directly adjusted to equity	4,555	4,736	4,273
Income tax recognized as other comprehensive income (loss)	(354,903)	(203,450)	47,213
Gain(loss) on valuation of financial assets at fair value through other comprehensive income	(31,416)	(9,753)	19,447
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax	40,390	24,220	(47,231)
Remeasurements of defined benefit liability	(322,489)	(126,890)	14,971
Investments in associates	(66,677)	(53,672)	35,714
Others	₩ 25,289	₩ (37,355)	₩ 24,312

Income Taxes - Summary of Recon

Income Taxes - Summary of Reconciliation Between Actual Income Tax Expense and Amount Computed by Applying the Statutory Tax Rate (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]
Profit (loss) before income tax (previously stated)		₩ (33,843,619)		₩ (7,071,570)		₩ 2,991,533
Income tax expense (benefit) computed at applicable tax rate	[1]	(9,306,995)		(1,944,682)		822,672
Adjustments		(155,890)		(64,420)		140,148
Effect of applying gradual tax rate		(10,362)		(10,362)		(10,362)
Effect of non-taxable income		(9,471)		(4,983)		(13,593)
Effect of non-deductible expenses		39,663		78,814		46,776
Effect of tax losses that are not recognized as deferred tax asset		19,275		1,351		0
Effects of tax credits and deduction		(98,684)		(43,931)		(63,753)
Reversal of unrecognized deferred tax asset, net		(38,708)		(43,641)		(10,471)
Effect of change in deferred tax due to change in tax rate		393,416		18,931		(17,590)
Deduction of deferred tax assets		(85,514)		73,887		55,682
Deferred tax related to investments in subsidiaries, associates and joint ventures		(375,064)		(135,878)		102,137
Others, net		9,559		1,392		51,322
Adjustment in respect of prior years due to change in estimate		48,374		153,113		(63,756)
Income tax expense (benefit)		₩ (9,414,511)		₩ (1,855,989)		₩ 899,064
Effective tax rate			[2]		[2]	30.05%
[1]Applicable tax rate is 27.5% as of December 31, 2020, 2021 and 2022.[2]The effective tax rate for the year ended December 31, 2020 is 30.05

Income Taxes - Summary of Rec_2

Income Taxes - Summary of Reconciliation Between Actual Income Tax Expense and Amount Computed by Applying the Statutory Tax Rate (Parentheticals) (Details)	12 Months Ended
	Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]
Applicable tax rate	27.50%		27.50%		27.50%
Effective tax rate		[1]		[1]	30.05%
[1]The effective tax rate for the year ended December 31, 2020 is 30.05

Income Taxes - Summary of Chang

Income Taxes - Summary of Changes in Deferred Income Tax Assets (Liabilities) (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	₩ (5,198,946)	₩ (7,367,101)
Amounts recognized in profit or loss	10,026,566	2,366,869
Amount recognized in other comprehensive income (loss)	(354,903)	(203,450)	₩ 47,213
Amounts recognized directly in equity	4,555	4,736
Ending balance	4,477,272	(5,198,946)	(7,367,101)
Deferred income tax on temporary differences
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	(7,962,698)	(8,400,772)
Amounts recognized in profit or loss	896,758	636,788
Amount recognized in other comprehensive income (loss)	(354,903)	(203,450)
Amounts recognized directly in equity	4,555	4,736
Ending balance	(7,416,288)	(7,962,698)	(8,400,772)
Employee benefits
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	558,383	689,787
Amounts recognized in profit or loss	(36,341)	(4,514)
Amount recognized in other comprehensive income (loss)	(322,489)	(126,890)
Amounts recognized directly in equity	0	0
Ending balance	199,553	558,383	689,787
Cash flow hedges
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	(49,947)	15,587
Amounts recognized in profit or loss	(46,188)	(90,217)
Amount recognized in other comprehensive income (loss)	40,390	24,220
Amounts recognized directly in equity	405	463
Ending balance	(55,340)	(49,947)	15,587
Investments in subsidiaries, associates and joint ventures
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	(8,721,320)	(8,668,015)
Amounts recognized in profit or loss	410,310	367
Amount recognized in other comprehensive income (loss)	(66,677)	(53,672)
Amounts recognized directly in equity	0	0
Ending balance	(8,377,687)	(8,721,320)	(8,668,015)
Property, plant and equipment
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	(7,430,461)	(7,713,449)
Amounts recognized in profit or loss	(111,177)	282,988
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	0	0
Ending balance	(7,541,638)	(7,430,461)	(7,713,449)
Finance lease
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	(415,558)	(211,420)
Amounts recognized in profit or loss	9,919	(204,138)
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	0	0
Ending balance	(405,639)	(415,558)	(211,420)
Intangible Assets
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	(31,481)	(31,166)
Amounts recognized in profit or loss	6,550	(315)
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	0	0
Ending balance	(24,931)	(31,481)	(31,166)
Financial assets at fair value through profit or loss
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	12	13
Amounts recognized in profit or loss	3,445	(1)
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	0	0
Ending balance	3,457	12	13
Financial assets at fair value through other comprehensive income
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	27,381	37,950
Amounts recognized in profit or loss	25,178	(816)
Amount recognized in other comprehensive income (loss)	(31,416)	(9,753)
Amounts recognized directly in equity	0	0
Ending balance	21,143	27,381	37,950
Deferred revenue
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	186,391	199,701
Amounts recognized in profit or loss	(16,411)	(13,310)
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	0	0
Ending balance	169,980	186,391	199,701
Provisions
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	6,494,314	5,916,803
Amounts recognized in profit or loss	595,030	577,511
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	0	0
Ending balance	7,089,344	6,494,314	5,916,803
Doubtful receivables
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	801	0
Amounts recognized in profit or loss	1,673	801
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	0	0
Ending balance	2,474	801	0
Other financial liabilities
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	31,410	30,399
Amounts recognized in profit or loss	(14,142)	(3,262)
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	4,150	4,273
Ending balance	21,418	31,410	30,399
Gains or losses on foreign exchange translation
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	91,411	(11,635)
Amounts recognized in profit or loss	42,905	103,046
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	0	0
Ending balance	134,316	91,411	(11,635)
Allowance for doubtful accounts
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	64,264	56,129
Amounts recognized in profit or loss	(6,029)	8,135
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	0	0
Ending balance	58,235	64,264	56,129
Accrued income
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	10,002	8,944
Amounts recognized in profit or loss	6,612	1,058
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	0	0
Ending balance	16,614	10,002	8,944
Special deduction for property, plant and equipment
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	(224,127)	(226,351)
Amounts recognized in profit or loss	8,968	2,224
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	0	0
Ending balance	(215,159)	(224,127)	(226,351)
Others
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	1,445,827	1,505,951
Amounts recognized in profit or loss	16,456	(22,769)
Amount recognized in other comprehensive income (loss)	25,289	(37,355)
Amounts recognized directly in equity	0	0
Ending balance	1,487,572	1,445,827	1,505,951
Deferred income tax on unused tax losses and tax credit
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	2,763,752	1,033,671
Amounts recognized in profit or loss	9,129,808	1,730,081
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	0	0
Ending balance	11,893,560	2,763,752	1,033,671
Unused tax losses
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	2,559,877	893,074
Amounts recognized in profit or loss	9,102,228	1,666,803
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	0	0
Ending balance	11,662,105	2,559,877	893,074
Excess of donation limit
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	69,185	35,181
Amounts recognized in profit or loss	11,861	34,004
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	0	0
Ending balance	81,046	69,185	35,181
Tax credit
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	134,690	105,416
Amounts recognized in profit or loss	15,719	29,274
Amount recognized in other comprehensive income (loss)	0	0
Amounts recognized directly in equity	0	0
Ending balance	₩ 150,409	₩ 134,690	₩ 105,416

Income Taxes - Summary of Defer

Income Taxes - Summary of Deferred Income Tax Assets (Liabilities) (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets and liabilities [abstract]
Deferred tax assets	₩ 10,934,375	₩ 1,901,992
Deferred tax liabilities	(6,457,103)	(7,100,938)
Net Deferred tax assets(liabilities)	₩ 4,477,272	₩ (5,198,946)	₩ (7,367,101)

Income Taxes - Summary of Deduc

Income Taxes - Summary of Deductible Temporary Differences, Tax Losses and Unused Tax Credits for Which No Deferred Income Tax Assets Were Recognized (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits [abstract]
Deductible temporary differences	₩ 1,381,532	₩ 1,539,980

Assets Held-for-Sale (Details)

Assets Held-for-Sale (Details) - Non-current assets held for sale - KRW (₩) ₩ in Millions		Dec. 31, 2022	Dec. 31, 2021
Assets Held for Sale [Line Items]
Assets Held-for-Sale		₩ 44,748	₩ 15,879
Land
Assets Held for Sale [Line Items]
Assets Held-for-Sale	[1],[2]	31,766	2,907
Buildings
Assets Held for Sale [Line Items]
Assets Held-for-Sale	[1],[2]	12,981	12,971
Structures
Assets Held for Sale [Line Items]
Assets Held-for-Sale	[1]	₩ 1	₩ 1
[1]The board of directors of KEPCO Engineering & Construction Company, Inc., a subsidiary of the Company, made a resolution to sell its old office building in Yongin-si, Gyeonggi-do during the year ended December 31, 2022, and reclassified the buildings, structures, and land as assets held-for-sale expecting its carrying amount would be recovered through a sale transaction.[2]The board of directors of Korea Electric Power Corporation, the controlling company, made a resolution to sell the Uijeongbu substation during the year ended December 31, 2022, and reclassified the buildings and land as assets held-for-sale expecting its carrying amount would be recovered through a sale transaction.

Expenses Classified by Nature_2

Expenses Classified by Nature (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of attribution of expenses by nature to their function [line items]
Raw materials used	₩ 34,832,581	₩ 18,660,477	₩ 13,544,410
Salaries	5,471,459	5,397,682	5,278,637
Retirement benefits expense	615,370	601,390	561,996
Welfare and benefit expense	695,839	725,998	639,390
Insurance expense	127,507	122,453	103,308
Depreciation	12,301,131	11,771,324	11,369,496
Amortization of intangible assets	156,160	166,161	170,466
Bad debt expense	23,634	17,968	20,648
Commission	771,947	717,559	744,322
Advertising expense	44,291	38,782	37,720
Training expense	22,140	18,206	18,108
Vehicle maintenance expense	21,024	17,001	16,596
Publishing expense	6,746	6,878	7,201
Business promotion expense	6,538	7,299	7,334
Rent expense	234,119	237,884	227,410
Telecommunication expense	17,622	19,528	18,647
Transportation expense	114,857	54,235	11,369
Taxes and dues	676,497	622,826	555,031
Expendable supplies expense	56,776	50,466	44,995
Water, light and heating expense	77,952	55,376	42,958
Repairs and maintenance expense	2,739,424	2,617,995	2,544,901
Ordinary development expense	727,810	689,397	700,642
Travel expense	95,061	78,202	71,689
Clothing expense	21,822	18,534	22,950
Survey and analysis expense	5,448	4,881	4,572
Membership fee	18,381	9,823	14,404
Power purchase	41,984,858	21,619,039	15,725,220
Others	2,046,022	2,172,722	1,978,202
Total expenses, by nature	103,913,016	66,520,086	54,482,622
Selling and administrative expense
Disclosure of attribution of expenses by nature to their function [line items]
Raw materials used	0	0	0
Salaries	1,142,360	1,121,188	1,095,183
Retirement benefits expense	109,758	113,127	103,967
Welfare and benefit expense	155,781	155,558	155,071
Insurance expense	20,835	17,909	10,178
Depreciation	244,676	219,427	218,103
Amortization of intangible assets	85,661	91,428	87,086
Bad debt expense	23,634	17,968	20,648
Commission	420,390	410,287	368,275
Advertising expense	33,739	29,230	29,559
Training expense	7,327	4,923	5,196
Vehicle maintenance expense	10,749	8,849	9,435
Publishing expense	3,732	3,568	3,677
Business promotion expense	3,198	3,522	3,614
Rent expense	47,680	43,650	36,337
Telecommunication expense	7,945	8,569	8,686
Transportation expense	1,012	870	1,007
Taxes and dues	122,177	93,446	62,828
Expendable supplies expense	9,617	9,052	8,029
Water, light and heating expense	17,950	12,351	11,749
Repairs and maintenance expense	152,449	123,134	79,185
Ordinary development expense	213,932	213,936	197,436
Travel expense	16,062	11,099	10,793
Clothing expense	13,044	10,540	14,834
Survey and analysis expense	1,126	889	826
Membership fee	1,469	1,331	1,274
Power purchase	0	0	0
Others	143,119	149,945	135,467
Total expenses, by nature	3,009,422	2,875,796	2,678,443
Cost of sales
Disclosure of attribution of expenses by nature to their function [line items]
Raw materials used	34,832,581	18,660,477	13,544,410
Salaries	4,329,099	4,276,494	4,183,454
Retirement benefits expense	505,612	488,263	458,029
Welfare and benefit expense	540,058	570,440	484,319
Insurance expense	106,672	104,544	93,130
Depreciation	12,056,455	11,551,897	11,151,393
Amortization of intangible assets	70,499	74,733	83,380
Bad debt expense	0	0	0
Commission	351,557	307,272	376,047
Advertising expense	10,552	9,552	8,161
Training expense	14,813	13,283	12,912
Vehicle maintenance expense	10,275	8,152	7,161
Publishing expense	3,014	3,310	3,524
Business promotion expense	3,340	3,777	3,720
Rent expense	186,439	194,234	191,073
Telecommunication expense	9,677	10,959	9,961
Transportation expense	113,845	53,365	10,362
Taxes and dues	554,320	529,380	492,203
Expendable supplies expense	47,159	41,414	36,966
Water, light and heating expense	60,002	43,025	31,209
Repairs and maintenance expense	2,586,975	2,494,861	2,465,716
Ordinary development expense	513,878	475,461	503,206
Travel expense	78,999	67,103	60,896
Clothing expense	8,778	7,994	8,116
Survey and analysis expense	4,322	3,992	3,746
Membership fee	16,912	8,492	13,130
Power purchase	41,984,858	21,619,039	15,725,220
Others	1,902,903	2,022,777	1,842,735
Total expenses, by nature	₩ 100,903,594	₩ 63,644,290	₩ 51,804,179

Earnings (Loss) Per Share - Sum

Earnings (Loss) Per Share - Summary of Basic Earnings Loss Per Share (Details) - KRW (₩) ₩ / shares in Units, ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Basic earnings per share [abstract]
Profit (loss) attributable to owners of the controlling company (previously stated)	₩ (24,466,853)	₩ (5,304,522)	₩ 1,991,347
Profit (loss) used in the calculation of total basic earnings (loss) per share	₩ (24,466,853)	₩ (5,304,522)	₩ 1,991,347
Weighted average number of common shares	641,964,077	641,964,077	641,964,077
Basic earnings (loss) per share	₩ (38,112)	₩ (8,263)	₩ 3,102

Earnings (Loss) Per Share - S_2

Earnings (Loss) Per Share - Summary of Diluted Earnings Loss Per Share (Details) - KRW (₩) ₩ / shares in Units, ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Diluted earnings per share [abstract]
Profit (loss) used in the calculation of total diluted earnings (loss) per share	₩ (24,466,853)	₩ (5,304,522)	₩ 1,991,347
Weighted average number of common shares	641,964,077	641,964,077	641,964,077
Diluted weighted average number of shares	641,964,077	641,964,077	641,964,077
Diluted earnings (loss) per share	₩ (38,112)	₩ (8,263)	₩ 3,102

Risk Management - Summary of Ca

Risk Management - Summary of Capital Risk Management (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of Capital risk management [Abstract]
Total borrowings and debt securities	₩ 120,605,365	₩ 80,529,513
Cash and cash equivalents	3,234,780	2,635,238	₩ 2,029,584	₩ 1,810,129
Net borrowings and debt securities	117,370,585	77,894,275
Total equity	₩ 42,000,256	₩ 65,326,706	₩ 70,668,059	₩ 68,889,649
Debt to equity ratio	279.45%	119.24%

Risk Management - Summary of Ma

Risk Management - Summary of Maximum Exposure to Credit Risk (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2022	Dec. 31, 2021
Cash and cash equivalents
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk		₩ 3,234,780	₩ 2,635,238
Financial assets at fair value through profit or loss
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	[1]	3,610,408	932,736
Derivative assets (trading)
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk		693,072	443,027
Financial assets at fair value through other comprehensive income (debt securities)
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk		529	491
Financial assets at amortized cost
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk		26,998	25,273
Loans
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk		1,013,371	909,071
Long-term/short-term financial instruments
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk		1,353,080	1,728,508
Derivative assets (applying hedge accounting)
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk		324,952	204,756
Trade and other receivables
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk		12,614,902	10,029,276
Financial guarantee contracts
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	[2]	₩ 3,776,060	₩ 3,718,015
[1]Equity investments held by the Company are excluded.[2]Maximum exposure associated with the financial guarantee contracts is the maximum amounts of the obligation.

Risk Management - Summary of Se

Risk Management - Summary of Sensitivity Analysis for Actuarial Assumptions (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Disclosure of sensitivity analysis for actuarial assumptions [line items]
1% Increase	₩ 27,495	₩ 25,649
1% Decrease	27,495	25,649
Actuarial assumption of expected rates of salary increases
Disclosure of sensitivity analysis for actuarial assumptions [line items]
1% Increase	321,930	466,832
1% Decrease	(283,658)	(407,554)
Actuarial assumption of discount rates
Disclosure of sensitivity analysis for actuarial assumptions [line items]
1% Increase	(289,229)	(422,290)
1% Decrease	₩ 337,033	₩ 499,571

Risk Management - Summary of Pr

Risk Management - Summary of Principal Assumptions on Provisions Valuation (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
PCBs
Disclosure of Principal assumptions on provisions valuation [Line Items]
Inflation rate	1.98%	1.37%
Discount rate	1.92%	1.88%
Nuclear plants
Disclosure of Principal assumptions on provisions valuation [Line Items]
Inflation rate	2.25%	1.41%
Discount rate	2.48%	2.20%
Spent fuel
Disclosure of Principal assumptions on provisions valuation [Line Items]
Inflation rate	2.93%	2.93%
Discount rate	4.49%	4.49%
Radioactive waste
Disclosure of Principal assumptions on provisions valuation [Line Items]
Inflation rate	3.06%	1%
Discount rate	2.62%	1.87%

Risk Management - Summary of _2

Risk Management - Summary of Sensitivity Analysis for Provisions Assumptions (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
PCBs | Discount rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	₩ (169)	₩ (222)
0.1% Decrease	169	223
PCBs | Inflation rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	169	224
0.1% Decrease	(169)	(224)
Nuclear plants | Discount rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	(474,432)	(369,540)
0.1% Decrease	491,360	381,026
Nuclear plants | Inflation rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	515,262	403,420
0.1% Decrease	(498,258)	(391,754)
Spent fuel | Discount rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	(54,330)	(51,430)
0.1% Decrease	56,453	53,438
Spent fuel | Inflation rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	57,269	54,210
0.1% Decrease	(55,191)	(52,245)
Radioactive waste | Discount rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	(15,089)	(11,201)
0.1% Decrease	15,260	11,306
Radioactive waste | Inflation rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	14,190	10,366
0.1% Decrease	₩ 14,056	₩ (10,288)

Risk Management - Summary of Fo

Risk Management - Summary of Foreign Currency Risk (Details) ₽ in Thousands, ₸ in Thousands, ₱ in Thousands, € in Thousands, ₫ in Thousands, ₨ in Thousands, ₨ in Thousands, ฿ in Thousands, ৳ in Thousands, ر.س in Thousands, د.إ in Thousands, ج.م. in Thousands, ¥ in Thousands, £ in Thousands, kr in Thousands, SFr in Thousands, Rp in Thousands, RM in Thousands, R in Thousands, P in Thousands, Kč in Thousands, K in Thousands, JD in Thousands, Ar in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, ₩ in Millions

Dec. 31, 2022 KRW (₩)

Dec. 31, 2022 AED (د.إ)

Dec. 31, 2022 AUD ($)

Dec. 31, 2022 BDT (৳)

Dec. 31, 2022 BWP (P)

Dec. 31, 2022 EGP (ج.م.)

Dec. 31, 2022 CAD ($)

Dec. 31, 2022 CHF (SFr)

Dec. 31, 2022 CZK (Kč)

Dec. 31, 2022 EUR (€)

Dec. 31, 2022 GBP (£)

Dec. 31, 2022 HKD ($)

Dec. 31, 2022 IDR (Rp)

Dec. 31, 2022 INR (₨)

Dec. 31, 2022 JOD (JD)

Dec. 31, 2022 JPY (¥)

Dec. 31, 2022 KZT (₸)

Dec. 31, 2022 MGA (Ar)

Dec. 31, 2022 MMK (K)

Dec. 31, 2022 MYR (RM)

Dec. 31, 2022 PHP (₱)

Dec. 31, 2022 PKR (₨)

Dec. 31, 2022 RUB (₽)

Dec. 31, 2022 SAR (ر.س)

Dec. 31, 2022 SEK (kr)

Dec. 31, 2022 THB (฿)

Dec. 31, 2022 USD ($)

Dec. 31, 2022 UYU ($)

Dec. 31, 2022 VND (₫)

Dec. 31, 2022 ZAR (R)

Dec. 31, 2021 KRW (₩)

Dec. 31, 2021 AED (د.إ)

Dec. 31, 2021 AUD ($)

Dec. 31, 2021 BDT (৳)

Dec. 31, 2021 BWP (P)

Dec. 31, 2021 EGP (ج.م.)

Dec. 31, 2021 CAD ($)

Dec. 31, 2021 CHF (SFr)

Dec. 31, 2021 CZK (Kč)

Dec. 31, 2021 EUR (€)

Dec. 31, 2021 GBP (£)

Dec. 31, 2021 HKD ($)

Dec. 31, 2021 IDR (Rp)

Dec. 31, 2021 INR (₨)

Dec. 31, 2021 JOD (JD)

Dec. 31, 2021 JPY (¥)

Dec. 31, 2021 KZT (₸)

Dec. 31, 2021 MGA (Ar)

Dec. 31, 2021 MMK (K)

Dec. 31, 2021 MYR (RM)

Dec. 31, 2021 PHP (₱)

Dec. 31, 2021 PKR (₨)

Dec. 31, 2021 RUB (₽)

Dec. 31, 2021 SAR (ر.س)

Dec. 31, 2021 SEK (kr)

Dec. 31, 2021 THB (฿)

Dec. 31, 2021 USD ($)

Dec. 31, 2021 UYU ($)

Dec. 31, 2021 VND (₫)

Dec. 31, 2021 ZAR (R)

Disclosure Of Foreign Currency Risk [Line Items]

Assets

₩ 234,804,994

₩ 211,123,727

Liabilities

₩ 192,804,738

₩ 145,797,021

Currency risk

Disclosure Of Foreign Currency Risk [Line Items]

Assets

د.إ 5,610

$ 4,448

৳ 7,514

P 824

ج.م. 0

$ 89

SFr 0

Kč 0

€ 1,976

£ 0

$ 0

Rp 598,697

₨ 1,592,380

JD 1,146

¥ 568,263

₸ 1,510

Ar 2,856,045

K 199,518

RM 38,177

₱ 68,592

₨ 533,816

₽ 0

ر.س 1,713

kr 0

฿ 0

$ 1,484,614

$ 128,674

₫ 1,184,670

R 43,461

د.إ 6,481

$ 3,733

৳ 50,145

P 939

ج.م. 0

$ 582

SFr 0

Kč 0

€ 1,809

£ 0

$ 0

Rp 768,731

₨ 1,715,900

JD 1,852

¥ 697,747

₸ 1,510

Ar 4,262,857

K 210,335

RM 1,964

₱ 164,167

₨ 200,844

₽ 0

ر.س 2,615

kr 0

฿ 0

$ 1,381,441

$ 90,930

₫ 952,135

R 31,971

Liabilities

د.إ 25,597

$ 299,663

৳ 0

P 0

ج.م. 1,162

$ 595

SFr 500,158

Kč 153

€ 41,073

£ 31

$ 4,014,446

Rp 1,323,840

₨ 312,978

JD 14

¥ 1,719,846

₸ 0

Ar 347,403

K 0

RM 0

₱ 7,493

₨ 219,341

₽ 2,881

ر.س 9,710

kr 449,211

฿ 389

$ 13,599,643

$ 3,106

₫ 4,495

R 0

د.إ 31,637

$ 926,960

৳ 577

P 0

ج.م. 595

$ 2,266

SFr 500,230

Kč 386

€ 42,981

£ 0

$ 1,651,665

Rp 995,510

₨ 342,833

JD 118

¥ 153,383

₸ 0

Ar 475,807

K 0

RM 0

₱ 104,245

₨ 74,423

₽ 0

ر.س 0

kr 449,167

฿ 0

$ 12,023,085

$ 3,097

₫ 262,372

R 0

Risk Management - Summary of _3

Risk Management - Summary of Sensitivity Analysis for Foreign Currency Exchange Rates (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Increase (decrease) of profit before income tax
Disclosure of sensitivity analysis for foreign currency exchange rates [Line Items]
10% Increase		₩ (1,703,053)	₩ (1,439,185)
10% Decrease		1,703,053	1,439,185
Increase (decrease) of equity
Disclosure of sensitivity analysis for foreign currency exchange rates [Line Items]
10% Increase	[1]	(1,703,053)	(1,439,185)
10% Decrease	[1]	₩ 1,703,053	₩ 1,439,185
[1]The effect on the shareholders’ equity excluding the impact of income taxes.

Risk Management - Summary of In

Risk Management - Summary of Interest Rate Risk (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Disclosure of financial instruments by type of interest rate [line items]
Short-term borrowings	₩ 12,457,853	₩ 4,382,218
Long-term borrowings	2,962,323	2,265,624
Floating interest rate [member]
Disclosure of financial instruments by type of interest rate [line items]
Short-term borrowings	3,154,972	391,897
Long-term borrowings	5,388,073	2,405,244
Debt securities	269,101	257,667
Total	₩ 8,812,146	₩ 3,054,808

Risk Management - Summary of _4

Risk Management - Summary of Sensitivity Analysis for Interest Rates (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Increase (decrease) of profit before income tax
Disclosure Of Sensitivity Analysis For Interest Rates [Line Items]
1% Increase		₩ (88,121)	₩ (30,548)
1% Decrease		88,121	30,548
Increase (decrease) of shareholder's equity
Disclosure Of Sensitivity Analysis For Interest Rates [Line Items]
1% Increase	[1]	(88,121)	(30,548)
1% Decrease	[1]	₩ 88,121	₩ 30,548
[1]The effect on the shareholders’ equity excluding the impact of income taxes.

Risk Management - Summary of _5

Risk Management - Summary of Sensitivity Analysis for Electricity Rates (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Increase (decrease) of profit before income tax
Disclosure of Sensitivity analysis for electricity rates [Line Items]
1% Increase		₩ 661,990	₩ 573,086
1% Decrease		(661,990)	(573,086)
Increase (decrease) of shareholder's equity
Disclosure of Sensitivity analysis for electricity rates [Line Items]
1% Increase	[1]	661,990	573,086
1% Decrease	[1]	₩ (661,990)	₩ (573,086)
[1]The effect on the equity excluding the impact of income taxes.

Risk Management - Summary of _6

Risk Management - Summary of Maturity Analysis for Non Derivative Financial Liabilities (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2022	Dec. 31, 2021
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings and debt securities		₩ 138,002,832	₩ 91,950,482
Lease liabilities		4,612,352	4,928,988
Trade and other payables		13,459,320	9,739,421
Financial guarantee contracts	[1]	3,776,060	3,718,015
Non-derivative financial liabilities, undiscounted cash flows		159,850,564	110,336,906
Financial guarantee liabilities		67,240	80,841
Less than 1 year
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings and debt securities		26,157,747	15,833,589
Lease liabilities		639,756	620,121
Trade and other payables		11,369,512	7,569,869
Financial guarantee contracts	[1]	105,091	435,729
Non-derivative financial liabilities, undiscounted cash flows		38,272,106	24,459,308
1~2 Years
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings and debt securities		27,367,577	11,229,657
Lease liabilities		657,210	636,724
Trade and other payables		347,563	777,017
Financial guarantee contracts	[1]	54,310	0
Non-derivative financial liabilities, undiscounted cash flows		28,426,660	12,643,398
2~5 Years
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings and debt securities		47,361,676	28,663,693
Lease liabilities		1,390,374	1,521,421
Trade and other payables		1,008,133	725,231
Financial guarantee contracts	[1]	3,495,437	3,105,599
Non-derivative financial liabilities, undiscounted cash flows		53,255,620	34,015,944
More than 5 years
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings and debt securities		37,115,832	36,223,543
Lease liabilities		1,925,012	2,150,722
Trade and other payables		734,112	667,304
Financial guarantee contracts	[1]	121,222	176,687
Non-derivative financial liabilities, undiscounted cash flows		₩ 39,896,178	₩ 39,218,256
[1]This represents the total guarantee amounts associated with the financial guarantee contracts. Financial guarantee liabilities which are recognized as of December 31, 2021 and 2022 are ￦80,841 million and ￦67,240 million, respectively.

Risk Management - Summary of _7

Risk Management - Summary of Maturity Analysis for Non Derivative Financial Assets (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]
Cash and cash equivalents		₩ 3,234,780	₩ 2,635,238	₩ 2,029,584	₩ 1,810,129
Financial assets at fair value through other comprehensive income		502,829	435,107
Financial assets at amortized cost		26,998	25,273
Loans		1,046,521	939,126
Long-term/short-term financial instruments		1,353,080	1,728,508
Financial assets at fair value through profit or loss		3,709,508	1,032,864
Trade and other receivables		12,628,615	10,036,206
Financial assets held for managing liquidity risk		22,502,331	16,832,322
Less than 1 year
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]
Cash and cash equivalents		3,234,780	2,635,238
Financial assets at fair value through other comprehensive income			0
Financial assets at amortized cost		16,762	15,422
Loans		132,877	88,396
Long-term/short-term financial instruments		666,758	1,278,014
Financial assets at fair value through profit or loss		3,181,791	360,833
Trade and other receivables		10,464,191	8,123,455
Financial assets held for managing liquidity risk		17,697,159	12,501,358
1~5 Years
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]
Cash and cash equivalents		0	0
Financial assets at fair value through other comprehensive income		0	0
Financial assets at amortized cost		10,231	9,840
Loans		411,594	443,146
Long-term/short-term financial instruments		0	171,636
Financial assets at fair value through profit or loss		645	346
Trade and other receivables		1,083,593	1,233,703
Financial assets held for managing liquidity risk		1,506,063	1,858,671
More than 5 years
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]
Cash and cash equivalents		0	0
Financial assets at fair value through other comprehensive income		0	0
Financial assets at amortized cost		5	11
Loans		502,050	407,584
Long-term/short-term financial instruments		25	286
Financial assets at fair value through profit or loss		3,535	3,130
Trade and other receivables		1,080,831	679,048
Financial assets held for managing liquidity risk		1,586,446	1,090,059
Other
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]
Cash and cash equivalents	[1]	0	0
Financial assets at fair value through other comprehensive income	[1]	502,829	435,107
Financial assets at amortized cost	[1]	0	0
Loans	[1]	0	0
Long-term/short-term financial instruments	[1]	686,297	278,572
Financial assets at fair value through profit or loss	[1]	523,537	668,555
Trade and other receivables	[1]	0	0
Financial assets held for managing liquidity risk	[1]	₩ 1,712,663	₩ 1,382,234
[1]The maturities cannot be presently determined.

Risk Management - Summary of _8

Risk Management - Summary of Maturity Analysis for Derivative Financial Assets and Liabilities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	₩ (339,447)	₩ (76,319)
Derivative financial assets	1,048,713	661,447
Net settlement | Not Designated as Hedging Instrument Trading
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	0	0
Derivative financial assets	0	0
Gross settlement | Not Designated as Hedging Instrument Trading
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	(313,942)	(47,508)
Derivative financial assets	735,563	456,690
Gross settlement | Designated as Hedging Instrument
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	(25,505)	(28,811)
Derivative financial assets	313,150	204,757
Less than 1 year
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	(42,663)	(9,183)
Derivative financial assets	996,011	127,118
Less than 1 year | Net settlement | Not Designated as Hedging Instrument Trading
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	0	0
Derivative financial assets	0	0
Less than 1 year | Gross settlement | Not Designated as Hedging Instrument Trading
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	(42,663)	(6,628)
Derivative financial assets	861,621	93,554
Less than 1 year | Gross settlement | Designated as Hedging Instrument
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	0	(2,555)
Derivative financial assets	134,390	33,564
1~2 Years
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	(25,289)	(5,592)
Derivative financial assets	208,440	119,815
1~2 Years | Net settlement | Not Designated as Hedging Instrument Trading
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	0	0
Derivative financial assets	0	0
1~2 Years | Gross settlement | Not Designated as Hedging Instrument Trading
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	(15,225)	(4,954)
Derivative financial assets	160,938	54,617
1~2 Years | Gross settlement | Designated as Hedging Instrument
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	(10,064)	(638)
Derivative financial assets	47,502	65,198
2~5 Years
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	(176,306)	(35,549)
Derivative financial assets	(221,399)	305,423
2~5 Years | Net settlement | Not Designated as Hedging Instrument Trading
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	0	0
Derivative financial assets	0	0
2~5 Years | Gross settlement | Not Designated as Hedging Instrument Trading
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	(171,130)	(33,635)
Derivative financial assets	(352,657)	202,663
2~5 Years | Gross settlement | Designated as Hedging Instrument
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	(5,176)	(1,914)
Derivative financial assets	131,258	102,760
More than 5 years
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	(95,189)	(25,995)
Derivative financial assets	65,661	109,091
More than 5 years | Net settlement | Not Designated as Hedging Instrument Trading
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	0	0
Derivative financial assets	0	0
More than 5 years | Gross settlement | Not Designated as Hedging Instrument Trading
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	(84,924)	(2,291)
Derivative financial assets	65,661	105,856
More than 5 years | Gross settlement | Designated as Hedging Instrument
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	(10,265)	(23,704)
Derivative financial assets	₩ 0	₩ 3,235

Risk Management - Summary of Fa

Risk Management - Summary of Fair Value Measurement of Financial Assets (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Disclosure of financial assets [line items]
Financial assets	₩ 23,473,492	₩ 17,443,120
At fair value
Disclosure of financial assets [line items]
Financial assets	5,230,361	2,115,754
Financial assets, at fair value	5,230,361	2,115,754
At amortized cost
Disclosure of financial assets [line items]
Financial assets	18,243,131	15,327,366
Financial assets, at fair value	18,243,131	15,327,366
Financial assets at fair value through other comprehensive income | At fair value
Disclosure of financial assets [line items]
Financial assets	502,829	435,107
Financial assets, at fair value	502,829	435,107
Derivative assets | Not Designated as Hedging Instrument | At fair value
Disclosure of financial assets [line items]
Financial assets	693,072	443,027
Financial assets, at fair value	693,072	443,027
Derivative assets | Designated as Hedging Instrument | At fair value
Disclosure of financial assets [line items]
Financial assets	324,952	204,756
Financial assets, at fair value	324,952	204,756
Financial assets at fair value through profit or loss | At fair value
Disclosure of financial assets [line items]
Financial assets	3,709,508	1,032,864
Financial assets, at fair value	3,709,508	1,032,864
Financial assets at amortized cost | At amortized cost
Disclosure of financial assets [line items]
Financial assets	26,998	25,273
Financial assets, at fair value	26,998	25,273
Loans and receivables | At amortized cost
Disclosure of financial assets [line items]
Financial assets	1,013,371	909,071
Financial assets, at fair value	1,013,371	909,071
Trade receivables | At amortized cost
Disclosure of financial assets [line items]
Financial assets	12,614,902	10,029,276
Financial assets, at fair value	12,614,902	10,029,276
Long-term financial instruments | At amortized cost
Disclosure of financial assets [line items]
Financial assets	686,322	450,494
Financial assets, at fair value	686,322	450,494
Short-term financial instruments | At amortized cost
Disclosure of financial assets [line items]
Financial assets	666,758	1,278,014
Financial assets, at fair value	666,758	1,278,014
Cash and cash equivalents | At amortized cost
Disclosure of financial assets [line items]
Financial assets	3,234,780	2,635,238
Financial assets, at fair value	₩ 3,234,780	₩ 2,635,238

Risk Management - Summary of _9

Risk Management - Summary of Fair Value Measurement of Financial Liabilities (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2022	Dec. 31, 2021
Disclosure of financial liabilities [line items]
Financial liabilities		₩ 138,660,579	₩ 94,757,468
At fair value
Disclosure of financial liabilities [line items]
Financial liabilities		432,751	78,031
Financial liabilities, at fair value		432,751	78,031
At amortized cost
Disclosure of financial liabilities [line items]
Financial liabilities		138,227,828	94,679,437
Financial liabilities, at fair value		129,887,195	90,067,938
Derivative liabilities | Not Designated as Hedging Instrument | At fair value
Disclosure of financial liabilities [line items]
Financial liabilities		407,246	56,256
Financial liabilities, at fair value		407,246	56,256
Derivative liabilities | Designated as Hedging Instrument | At fair value
Disclosure of financial liabilities [line items]
Financial liabilities		25,505	21,775
Financial liabilities, at fair value		25,505	21,775
Secured borrowings | At amortized cost
Disclosure of financial liabilities [line items]
Financial liabilities		102,368	176,358
Financial liabilities, at fair value		102,368	176,358
Unsecured bond | At amortized cost
Disclosure of financial liabilities [line items]
Financial liabilities		105,185,189	73,881,671
Financial liabilities, at fair value		96,846,056	69,803,043
Lease liabilities | At amortized cost
Disclosure of financial liabilities [line items]
Financial liabilities		4,163,143	4,410,503
Financial liabilities, at fair value		4,163,143	4,410,503
Unsecured borrowings | At amortized cost
Disclosure of financial liabilities [line items]
Financial liabilities		15,282,193	6,471,484
Financial liabilities, at fair value		15,280,693	5,938,613
Trade and other payables | At amortized cost
Disclosure of financial liabilities [line items]
Financial liabilities	[1]	13,459,320	9,739,421
Financial liabilities, at fair value	[1]	13,459,320	9,739,421
Bank overdraft | At amortized cost
Disclosure of financial liabilities [line items]
Financial liabilities		35,615	0
Financial liabilities, at fair value		₩ 35,615	₩ 0
[1]Excludes lease liabilities.

Risk Management - Summary of Si

Risk Management - Summary of Significant Unobservable Inputs Used in Fair Value Measurement of Liabilities (Details)	Dec. 31, 2022	Dec. 31, 2021
Derivatives | Bottom of range
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [line items]
Borrowings, interest rate	0.60%	(0.63%)
Derivatives | Top of range
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [line items]
Borrowings, interest rate	7.93%	3.88%
Borrowings and debt securities | Bottom of range
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [line items]
Borrowings, interest rate	0.75%	(0.30%)
Borrowings and debt securities | Top of range
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [line items]
Borrowings, interest rate	5.84%	4.38%
Finance lease | Bottom of range
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [line items]
Borrowings, interest rate	0%	0%
Finance lease | Top of range
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [line items]
Borrowings, interest rate	17.08%	16.83%

Risk Management - Summary of_10

Risk Management - Summary of Fair Value Measurement of Assets (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of fair value measurement of assets [line items]
Financial assets at fair value through other comprehensive income	₩ 502,829	₩ 435,107	₩ 358,559
Derivative assets	1,048,713	661,447
Financial assets at fair value through profit or loss	3,709,508	1,032,864
At fair value
Disclosure of fair value measurement of assets [line items]
Financial assets at fair value through other comprehensive income	502,829	435,107
Derivative assets	1,018,024	647,783
Financial assets at fair value through profit or loss	3,709,508	1,032,864
Total	5,230,361	2,115,754
At fair value | Level 1
Disclosure of fair value measurement of assets [line items]
Financial assets at fair value through other comprehensive income	300,057	273,826
Derivative assets	0	0
Financial assets at fair value through profit or loss	0	0
Total	300,057	273,826
At fair value | Level 2
Disclosure of fair value measurement of assets [line items]
Financial assets at fair value through other comprehensive income	0	0
Derivative assets	1,018,024	647,783
Financial assets at fair value through profit or loss	3,703,179	1,027,067
Total	4,721,203	1,674,850
At fair value | Level 3
Disclosure of fair value measurement of assets [line items]
Financial assets at fair value through other comprehensive income	202,772	161,281
Derivative assets	0	0
Financial assets at fair value through profit or loss	6,329	5,797
Total	₩ 209,101	₩ 167,078

Risk Management - Summary of_11

Risk Management - Summary of Fair Value Measurement of Liabilities (Details) - At fair value - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Disclosure of fair value measurement of liabilities [line items]
Derivative liabilities	₩ 432,751	₩ 78,031
Level 1
Disclosure of fair value measurement of liabilities [line items]
Derivative liabilities	0	0
Level 2
Disclosure of fair value measurement of liabilities [line items]
Derivative liabilities	432,751	78,031
Level 3
Disclosure of fair value measurement of liabilities [line items]
Derivative liabilities	₩ 0	₩ 0

Risk Management - Summary of Re

Risk Management - Summary of Reconciliation of Changes in Fair Value Measurement, Assets (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Changes in fair value measurement, assets
Beginning balance	₩ 17,443,120
Valuation	3,709,508	₩ 1,032,864
Ending balance	23,473,492	17,443,120
Financial assets at fair value through profit or loss, category [member]
Changes in fair value measurement, assets
Beginning balance	1,475,891
Ending balance	4,402,580	1,475,891
Financial assets at fair value through other comprehensive income, category [member]
Changes in fair value measurement, assets
Beginning balance	435,107
Ending balance	502,829	435,107
At fair value
Changes in fair value measurement, assets
Beginning balance	2,115,754
Valuation	3,709,508	1,032,864
Ending balance	5,230,361	2,115,754
At fair value | Level 3
Changes in fair value measurement, assets
Valuation	6,329	5,797
At fair value | Level 3 | Financial assets at fair value through profit or loss, category [member]
Changes in fair value measurement, assets
Beginning balance	5,797	5,692
Acquisition	400	0
Reclassified category	0	0
Disposal	0	0
Valuation	132	105
Foreign currency translation and others	0	0
Ending balance	6,329	5,797
At fair value | Level 3 | Financial assets at fair value through other comprehensive income, category [member] | Unlisted Securities [Member]
Changes in fair value measurement, assets
Beginning balance	160,790	163,889
Acquisition	9,451	8,929
Reclassified category	0	0
Disposal	0	(13)
Valuation	33,237	(12,335)
Foreign currency translation and others	(1,235)	320
Ending balance	202,243	160,790
At fair value | Level 3 | Financial assets at fair value through other comprehensive income, category [member] | Debt securities [member]
Changes in fair value measurement, assets
Beginning balance	491	0
Acquisition	0	500
Reclassified category	0	0
Disposal	0	0
Valuation	38	0
Foreign currency translation and others	0	(9)
Ending balance	₩ 529	₩ 491

Service Concession Arrangemen_3

Service Concession Arrangements - Summary of Service Concession Arrangements (Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2022 KRW (₩)
Disclosure of detailed information about service concession arrangements [line items]
Hydroelectric Power Generation at Semangka, Indonesia (BOT)	₩ 643,581
Less than 1 year
Disclosure of detailed information about service concession arrangements [line items]
Hydroelectric Power Generation at Semangka, Indonesia (BOT)	31,653
1~2 Years
Disclosure of detailed information about service concession arrangements [line items]
Hydroelectric Power Generation at Semangka, Indonesia (BOT)	31,800
2~3 Years
Disclosure of detailed information about service concession arrangements [line items]
Hydroelectric Power Generation at Semangka, Indonesia (BOT)	31,728
Over 3 years
Disclosure of detailed information about service concession arrangements [line items]
Hydroelectric Power Generation at Semangka, Indonesia (BOT)	₩ 548,400

Related Parties - Summary of Tr

Related Parties - Summary of Transactions Between Related Parties (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Dongducheon Dream Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		₩ 8,942	₩ 19,923	₩ 7,757
Electricity purchase		2,244,332	750,148	552,692
Outstanding balances for related party transactions [abstract]
Trade receivables		592	6,282
Trade payables		293,256	114,613
Non-trade receivables and others		270	493
Saemangeum Sebit Power Plant Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		1,418	0	0
Electricity purchase		23,159	0	0
Outstanding balances for related party transactions [abstract]
Non-trade receivables and others		653	0
Korea Gas Corporation
Disclosure of transactions between related parties [line items]
Electricity sales		155,309	96,362	97,685
Fuel purchase		11,996,402	5,646,713	3,270,972
Outstanding balances for related party transactions [abstract]
Trade receivables	[1]	12,415	10,015
Trade payables	[1]	1,882,607	800,509
Non-trade receivables and others	[1]	54,232	187
Non-trade payables and others	[1]	1,294	759
Daejung Offshore Wind Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		46	46	32
Outstanding balances for related party transactions [abstract]
Non-trade receivables and others		123	77
Daegu Photovoltaic Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		268	207	325
Electricity purchase		4,744	3,532	3,313
Outstanding balances for related party transactions [abstract]
Trade payables		135	115
Non-trade payables and others		2	0
Haeng Bok Do Si Photovoltaic Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		2	2	2
Electricity purchase		563	393	370
Korea Electric Power Industrial Development Co., Ltd.
Disclosure of transactions between related parties [line items]
Service		10,369	11,208	10,833
Service		251,468	241,925	212,366
Outstanding balances for related party transactions [abstract]
Trade receivables		164	269
Trade payables		150	873
Non-trade receivables and others		2	15
Non-trade payables and others		9,588	5,880
Goseong Green Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Fuel sales		1,062,108	514,470	47,701
Electricity purchase		1,905,502	987,540	0
Outstanding balances for related party transactions [abstract]
Trade receivables		76,254	495
Trade payables		182,095	218,627
Non-trade receivables and others		14	76,855
Non-trade payables and others		52,515	59,987
Gangneung Eco Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Fuel sales		459,404	14,200	10,178
Outstanding balances for related party transactions [abstract]
Trade receivables		19,364	826
Non-trade receivables and others		478	465
Non-trade payables and others		94	97
Shin Pyeongtaek Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		27,486	23,501	20,791
Electricity purchase		957,294	653,306	520,737
Outstanding balances for related party transactions [abstract]
Trade receivables		7,375	1,788
Trade payables		109,274	79,828
Non-trade receivables and others		1,068	3,116
Non-trade payables and others		101	99
Noeul Green Energy Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		9,396	30	30
Electricity purchase		14,176	10,014	10,634
Outstanding balances for related party transactions [abstract]
Trade receivables		3	3
Non-trade receivables and others		9,365	1,169
Non-trade payables and others		2,468	0
Samcheok Eco Materials Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		546	620	700
Electricity purchase		12,019	13,612	10,713
Outstanding balances for related party transactions [abstract]
Trade receivables		46	52
YTN Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		2,180	1,922	1,805
Electricity purchase		304	388	353
Outstanding balances for related party transactions [abstract]
Trade receivables		112	99
Busan Green Energy Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		5,055	49	34
Electricity purchase		26,219	18,996	18,678
Outstanding balances for related party transactions [abstract]
Trade receivables		1	1
Non-trade receivables and others		26,681	20,658
Non-trade payables and others		4,415	0
Gunsan Bio Energy Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		0	20	102
Outstanding balances for related party transactions [abstract]
Non-trade receivables and others		11,728	11,728
Korea Electric Vehicle Charging Service
Disclosure of transactions between related parties [line items]
Electricity sales	[2]	3,686	3,039	1,956
Electricity purchase	[2]	0	393	581
Outstanding balances for related party transactions [abstract]
Trade receivables	[2]	0	193
Non-trade receivables and others	[2]	0	120
YaksuESS Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity purchase		851	1,715	217
Outstanding balances for related party transactions [abstract]
Trade payables		0	1,374
Gangwon Wind Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		1,549	1,865	2,109
Electricity purchase		40,130	19,623	23,350
Outstanding balances for related party transactions [abstract]
Trade receivables		6	8
Trade payables		5,197	4,293
Gwangyang Green Energy Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		1,848	486	23
Outstanding balances for related party transactions [abstract]
Non-trade receivables and others		1,436	532
Bigeum Resident Photovoltaic Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		660	755	85
Outstanding balances for related party transactions [abstract]
Trade receivables		343	922
Non-trade receivables and others		516	0
Hyundai Green Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales and design service		7,063	11,934	17,257
Outstanding balances for related party transactions [abstract]
Trade receivables		839	229
Korea Power Exchange
Disclosure of transactions between related parties [line items]
Service		16,596	39,796	25,919
Service		93,817	86,716	87,361
Outstanding balances for related party transactions [abstract]
Trade receivables		223	627
Non-trade receivables and others		0	1,300
Non-trade payables and others		2,405	2,189
Taebaek Wind Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Service		861	44	226
Service and REC		7,442	5,930	4,003
Outstanding balances for related party transactions [abstract]
Trade payables		680	560
Non-trade payables and others		178	262
Taebaek Guinemi Wind Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		0	26	37
Electricity purchase		6,793	5,910	5,023
Outstanding balances for related party transactions [abstract]
Trade payables		885	670
Pyeongchang Wind Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		1,323	1,180	2,064
Design service and others		3,884	4,099	3,969
Outstanding balances for related party transactions [abstract]
Trade receivables		3	4
Non-trade payables and others		211	0
Daeryun Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		2,016	1,944	1,947
Electricity purchase		428,534	157,234	99,523
Outstanding balances for related party transactions [abstract]
Trade receivables		195	213
Trade payables		55,725	21,362
Changjuk Wind Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	[3]	1,350	463	2,067
Electricity purchase	[3]	9,027	6,213	6,084
Outstanding balances for related party transactions [abstract]
Trade payables	[3]	0	724
Non-trade payables and others	[3]	0	295
GS Donghae Electric Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		5,238	21,127	31,557
Electricity purchase		1,035,263	760,377	660,351
Outstanding balances for related party transactions [abstract]
Trade receivables	[4]	872	383
Trade payables	[4]	72,947	113,529
Non-trade receivables and others	[4]	1,558	272
Non-trade payables and others	[4]	14,565	17
KNH Solar Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		13	14	16
Electricity purchase		4,348	3,222	3,564
Outstanding balances for related party transactions [abstract]
Trade receivables		1	1
S-Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Service		4,588	5,229	6,682
Service		1,091,741	608,530	293,515
Outstanding balances for related party transactions [abstract]
Trade receivables		77	82
Trade payables		135,504	91,277
Non-trade receivables and others		44	48
Non-trade payables and others		11	0
Chuncheon Green Energy Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		2	0	0
PND Solar Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		427	416	409
Electricity purchase		6,173	5,502	5,234
Outstanding balances for related party transactions [abstract]
Trade payables		210	0
Hyundai Eco Energy Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		277	187	167
Electricity purchase		29,209	25,762	17,777
Outstanding balances for related party transactions [abstract]
Trade receivables		22	19
Trade payables		738	732
YeongGwang Yaksu Wind Electric Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		66	78	77
Electricity purchase		7,382	11,729	9,151
Outstanding balances for related party transactions [abstract]
Trade receivables		7	6
Trade payables		589	0
Non-trade payables and others		2,050	0
Korea Energy Solutions Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		2	2	7
Electricity purchase		102	0	0
Outstanding balances for related party transactions [abstract]
Non-trade payables and others		94	0
Gwangbaek Solar Power Investment Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity purchase		602	742	373
Outstanding balances for related party transactions [abstract]
Non-trade payables and others		61	0
Green Energy Electricity Generation Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity purchase		2,962	1,238	0
Namjeongsusang Solar Power Operation Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		21	22	14
Electricity purchase		9,491	14,286	0
Outstanding balances for related party transactions [abstract]
Trade receivables		2	0
Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1
Disclosure of transactions between related parties [line items]
Service		394	399	291
Muan Solar Park Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		950	232	57
REC and others		17,052	31,017	0
Outstanding balances for related party transactions [abstract]
Trade receivables		25	0
Non-trade receivables and others		9	23
Suwon New Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		118	1,820	2,974
Outstanding balances for related party transactions [abstract]
Non-trade receivables and others		1,280	1,198
Muan Sunshine Solar Power Plant Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		17	52	30
Electricity purchase		19,514	15,900	0
Outstanding balances for related party transactions [abstract]
Trade payables		3,076	1,748
Non-trade payables and others		1,265	0
Energy Infra Asset Management Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		0	4,629	0
Service		2,779	2,657	0
Taebaek Gadeoksan Wind Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		1,952	295	0
Electricity purchase		25,880	16,360	0
Outstanding balances for related party transactions [abstract]
Trade payables		12,739	8,397
Non-trade receivables and others		97	119
Non-trade payables and others		5	1,571
ITR Co., Ltd.
Disclosure of transactions between related parties [line items]
Service		6	3	0
Structure test network Co., Ltd.
Disclosure of transactions between related parties [line items]
Service		7	5	0
Bitgoel Eco Energy Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		1,397	282	0
Service and others		930	0	0
Outstanding balances for related party transactions [abstract]
Non-trade receivables and others		6	27
Non-trade payables and others		1,023	0
Anjwa Smart Farm & Solar City Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		1,068	624	0
Electricity purchase		16,942	24,601	0
Outstanding balances for related party transactions [abstract]
Non-trade payables and others		921	0
Daewon Green Energy Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		185	155	0
Others		42,651	0	0
Outstanding balances for related party transactions [abstract]
Trade receivables		1	0
Trade payables		5,485	0
Non-trade receivables and others		0	94
Saemangeum Heemang Photovoltaic Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		5,740	13	0
Electricity purchase		1,039	0	0
Outstanding balances for related party transactions [abstract]
Non-trade receivables and others		3,435	0
Non-trade payables and others		1	0
UD four M Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		2	4	0
Electricity purchase		313	0	0
Dongbu Highway Solar Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		8	5	0
Electricity purchase		3,516	2,605	0
Outstanding balances for related party transactions [abstract]
Trade receivables		1	1
Trade payables		2	98
Non-trade payables and others		2	90
Seobu Highway Solar Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		8	8	0
Electricity purchase		3,452	2,936	0
Outstanding balances for related party transactions [abstract]
Trade receivables		1	0
Trade payables		8	177
Non-trade payables and others		3	105
SureDataLab Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		1	1	0
Hankook Electric Power Information Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		0	1	0
Kosture Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		5	1	0
Outstanding balances for related party transactions [abstract]
Trade receivables		6	1
Goesan Solar park Co., Ltd
Disclosure of transactions between related parties [line items]
Electricity purchase		7,642	6,209	0
Outstanding balances for related party transactions [abstract]
Trade payables		346	73
Jeju Gimnyeong Wind Power Co., Ltd
Disclosure of transactions between related parties [line items]
Electricity purchase		12,364	12,833	0
Outstanding balances for related party transactions [abstract]
Trade payables		1,758	885
Non-trade receivables and others		130	0
Seoroseoro Sunny Power Plant Co Ltd
Disclosure of transactions between related parties [line items]
Electricity sales		1	0	0
REC and others		1,138	217	0
YuDang Solar Co., Ltd
Disclosure of transactions between related parties [line items]
Electricity sales		160	0	0
REC and others		1,915	3,495	0
Jeju Gimnyeong Wind Power Co., Ltd. [Member]
Disclosure of transactions between related parties [line items]
Electricity sales		367	0	0
PlatformN. Co., Ltd.
Disclosure of transactions between related parties [line items]
Others		14	0	0
Others		475	0	0
Outstanding balances for related party transactions [abstract]
Non-trade payables and others		232	0
Gangneung Sacheon Fuel Cell Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		151	0	0
12 Associates (Overseas)
Disclosure of transactions between related parties [line items]
Electricity sales		548,507	125,723	66,755
Electricity purchase		101,790	502	0
G.GURU Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity purchase		452	0	0
Tronix Co., Ltd.
Outstanding balances for related party transactions [abstract]
Non-trade receivables and others		1	0
8 Associates (Overseas)
Outstanding balances for related party transactions [abstract]
Trade receivables		93	0
Non-trade receivables and others		49,409	3,196
Non-trade payables and others		502	502
Naepo Green Energy Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		761	467	217
Outstanding balances for related party transactions [abstract]
Trade receivables		169	42
Non-trade payables and others		3	0
Cheongna Energy Co., Ltd.
Disclosure of transactions between related parties [line items]
Others		39,802	16,469	13,791
Service		80	57	66
Outstanding balances for related party transactions [abstract]
Trade receivables		17,324	4,164
Non-trade receivables and others		1,654	1,350
Non-trade payables and others		1	1
Dayone Energy Co., Ltd.
Disclosure of transactions between related parties [line items]
Service		7,761	8,159	4,816
Service		13,872	5,409	1,120
Outstanding balances for related party transactions [abstract]
Trade receivables		79	52
Trade payables		1,027	1,009
Non-trade receivables and others		10,218	13,297
Non-trade payables and others		9,119	11,306
Daegu Green Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		1,190	1,053	1,285
Electricity purchase		508,601	289,052	215,224
Outstanding balances for related party transactions [abstract]
Trade receivables		53	71
Trade payables		66,715	35,766
Non-trade receivables and others		56	55
KAPES, Inc.
Disclosure of transactions between related parties [line items]
Commission		450	413	476
Commission		9,306	64,140	219,673
Outstanding balances for related party transactions [abstract]
Trade receivables		2	2
Non-trade payables and others		106	2,121
Honam Wind Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		242	71	502
Electricity purchase		7,662	4,807	4,382
Outstanding balances for related party transactions [abstract]
Trade payables		515	575
Jeongam Wind Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity purchase		0	3,145	5,982
Electricity sales and others		0	588	1,213
Korea Power Engineering Service Co., Ltd.
Disclosure of transactions between related parties [line items]
Service		268	339	203
Service		830	1,315	1,594
Outstanding balances for related party transactions [abstract]
Non-trade receivables and others		47	48
Non-trade payables and others		77	0
Seokmun Energy Co., Ltd.
Disclosure of transactions between related parties [line items]
Service		1,685	1,701	1,932
Service		60,799	44,315	33,164
Outstanding balances for related party transactions [abstract]
Trade receivables		67	34
Trade payables		7,000	7,941
Non-trade receivables and others		113	149
Incheon New Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Construction revenue		14	14	14
Chun-cheon Energy Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		2,505	2,329	2,657
Electricity purchase		585,689	327,536	222,069
Outstanding balances for related party transactions [abstract]
Trade receivables		124	126
Trade payables		79,117	41,410
Non-trade receivables and others		165	167
Yeonggwangbaeksu Wind Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		1,898	1,836	1,788
Electricity purchase		13,990	9,471	11,232
Outstanding balances for related party transactions [abstract]
Trade receivables		8	6
Trade payables		1,076	1,099
Non-trade receivables and others		166	53
Yeonggwang Wind Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		871	818	793
Electricity purchase		31,221	21,004	24,103
Outstanding balances for related party transactions [abstract]
Trade receivables		12	10
Trade payables		2,251	730
Non-trade receivables and others		62	59
NH-Amundi Global Infrastructure Investment Private Investment Trust 21
Disclosure of transactions between related parties [line items]
Service		1,415	1,727	1,388
KW Nuclear Components Co., Ltd.
Disclosure of transactions between related parties [line items]
Service		1,624	2,598	1,639
Service		9,504	96	0
KEPCO-Uhde Inc.
Disclosure of transactions between related parties [line items]
Electricity sales		12	10	8
Outstanding balances for related party transactions [abstract]
Non-trade payables and others		10	10
Busan Shinho Solar Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		502	376	353
Electricity purchase		10,601	7,895	7,296
Outstanding balances for related party transactions [abstract]
Trade receivables		3	2
Trade payables		304	281
Global Trade Of Power System Co., Ltd.
Disclosure of transactions between related parties [line items]
Service		715	323	337
Outstanding balances for related party transactions [abstract]
Non-trade payables and others		0	7
Expressway Solar-light Power Generation Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity purchase		4,016	3,146	2,472
Outstanding balances for related party transactions [abstract]
Trade payables		166	102
Daesan Green Energy Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		394	523	703
Electricity purchase		129,736	146,776	104,854
Outstanding balances for related party transactions [abstract]
Trade receivables		18	11
Trade payables		4,946	5,120
Non-trade receivables and others		218	120
Cheong-Song Noraesan Wind Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		698	30	29
Electricity purchase		980	0	0
Outstanding balances for related party transactions [abstract]
Trade receivables		2	2
Saemangeum Solar Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Service		100	1,141	2,846
Electricity purchase		1	5	0
Outstanding balances for related party transactions [abstract]
Non-trade receivables and others		4,368	4,268
Dangjin Eco Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		32	32	33
Electricity purchase		5,696	4,139	3,953
Outstanding balances for related party transactions [abstract]
Trade receivables		3	3
Trade payables		222	276
Non-trade payables and others		105	0
Bitsolar Energy Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		498	296	42
Electricity purchase		13,030	5,703	0
Outstanding balances for related party transactions [abstract]
Trade payables		201
Non-trade receivables and others		222	7
Non-trade payables and others		0	54
Busan Industrial Solar Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity purchase		4,575	2,815	19
Haemodum Solar Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		42	6	4
Electricity purchase		2,168	1,625	967
Outstanding balances for related party transactions [abstract]
Trade receivables		1	1
Yeongam Solar Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		379	339	165
Electricity purchase		44,745	47,805	32,208
Outstanding balances for related party transactions [abstract]
Trade receivables		44	29
Trade payables		3,655	3,324
Solaseado Solar Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		1,851	2,890	66
Electricity purchase		28,698	31,031	28,516
Outstanding balances for related party transactions [abstract]
Non-trade receivables and others		23	0
Non-trade payables and others		2,911	0
Chungsongmeon BongSan wind power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		1	1	0
Busan Industrial Solar Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		14	9	0
Outstanding balances for related party transactions [abstract]
Trade receivables		2	1
Trade payables		0	54
Non-trade receivables and others		0	24
Omisan Wind Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		1	1	0
Electricity purchase		0	7	0
KW Nuclear Components Co., Ltd
Outstanding balances for related party transactions [abstract]
Trade receivables		4	0
Non-trade receivables and others		18	0
Samsu Wind Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity purchase		10,605	2,800	0
Outstanding balances for related party transactions [abstract]
Trade payables		1,303	1,300
Seobusambo highway photovoltaics Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		3	0	0
Electricity purchase		103	0	0
Prime Swedish Holding AB [Member]
Disclosure of transactions between related parties [line items]
Electricity sales		284	0	0
Western Power Changgi Solar Co., Ltd. (formerly, Sam-Yang Photovoltaic Power Co., Ltd.)
Disclosure of transactions between related parties [line items]
Electricity sales	[3]	0	1,920	33
Electricity purchase	[3]	0	5,852	3,848
Outstanding balances for related party transactions [abstract]
Trade receivables	[3]	0	5
Goheung New Energy Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		141	0	0
Gunsan Land Solar Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		518	0	0
Electricity purchase		533	0
Outstanding balances for related party transactions [abstract]
Non-trade receivables and others		138	0
Hapcheon Floating Photovoltaic Power Plant Inc. [Member]
Disclosure of transactions between related parties [line items]
Electricity sales		544	0	0
Service and REC		2,526	0	0
Outstanding balances for related party transactions [abstract]
Trade receivables		9	0
Cheongju Eco Park Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		204	0	0
Electricity purchase		94,409	0
Outstanding balances for related party transactions [abstract]
Trade payables		7,994	0
Enel X Midland Photovoltaic, LLC
Disclosure of transactions between related parties [line items]
Electricity sales		12	0	0
Electricity purchase		1,871	0
Outstanding balances for related party transactions [abstract]
Trade receivables		1	0
Trade payables		3	0
Eumseong Eco Park Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		2	0	0
37 Joint ventures (Overseas)
Disclosure of transactions between related parties [line items]
Electricity sales		606,513	773,291	831,596
Electricity purchase		16,859	54,135	14,767
Energyco Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		463	1	0
Electricity purchase		7,898	0
Geumsungsan Wind Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales		7	0	0
Outstanding balances for related party transactions [abstract]
Trade receivables		3	0
Non-trade payables and others		1	0
22 Joint ventures (Overseas)
Outstanding balances for related party transactions [abstract]
Trade receivables		73,805	84,150
Non-trade receivables and others		71,661	26,060
Non-trade payables and others		117,754	22,050
Korea Development Bank
Disclosure of transactions between related parties [line items]
Electricity sales		4,134	4,177	4,248
Dividends paid		12	256,862	17
Interest income		2,222	756	3,461
Interest expense		4,208	2,756	₩ 3,872
Outstanding balances for related party transactions [abstract]
Non-trade receivables and others		30,836	420,732
Non-trade payables and others		101	21,172
Accrued interest income		5	154
Derivative assets		67,662	59,139
Derivative liabilities		₩ 3,759	₩ 0
[1]The balance due to the fuel swap with Korea Midland Power Co., Ltd. is included. The total transaction amount is ￦514,405 million on loans and ￦460,903 million on bororrowings.[2]The Company has disposed of shares of Korea Electric Vehicle Charging Service during the year ended December 31, 2022, and it is not a related party to the Group as of December 31, 2022.[3]Reclassified from a joint venture to a subsidiary during the year ended December 31, 2022. Transactions are made before the reclassification.[4]The balance due to the fuel swap with Korea Western Power Co., Ltd. and Korea East-West Power Co., Ltd. is included. The total transaction amount is ￦5,590 million on loans and ￦20,113 million on bororrowings.

Related Parties - Summary of _2

Related Parties - Summary of Transactions Between Related Parties (Parentheticals) (Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2022 KRW (₩)
Disclosure of transactions between related parties [line items]
Loans transactions between related parties	₩ 302,106
Korea Gas Corporation [Member] | Korea Midland Power [Member] | Fuel Swap [Member]
Disclosure of transactions between related parties [line items]
Loans transactions between related parties	514,405
Borrowings transactions with related parties	460,903
GS Donghae Electric Power Co., Ltd. [Member] | Korean Western Power Co Limited And Korean Eastern Power Co Ltd [Member] | Fuel Swap [Member]
Disclosure of transactions between related parties [line items]
Loans transactions between related parties	5,590
Borrowings transactions with related parties	₩ 20,113

Related Parties - Summary of Lo

Related Parties - Summary of Loans and Others Arising From Related Party Transaction (Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2022 KRW (₩)
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	₩ 318,826
Changes in Loans receivable transactions between related parties
Loans	302,106
Collection	(7,310)
Others	13,592
Ending balance	627,214
KNOC Nigerian East & West Oil Co., Ltd. | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	29,481
Changes in Loans receivable transactions between related parties
Loans	104
Collection	0
Others	1,888
Ending balance	31,473
KNOC Nigerian East & West Oil Co., Ltd. | Accumulated impairment [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	(8,241)
Changes in Loans receivable transactions between related parties
Loans	0
Collection	0
Others	(2,510)
Ending balance	(10,751)
Xe-Pian Xe-Namnoy Power Co., Ltd. | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	21,456
Changes in Loans receivable transactions between related parties
Loans	0
Collection	0
Others	1,480
Ending balance	22,936
PT Wampu Electric Power | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	13,000
Changes in Loans receivable transactions between related parties
Loans	0
Collection	(5,233)
Others	1,404
Ending balance	9,171
Gunsan Bio Energy Co., Ltd. | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	12,396
Changes in Loans receivable transactions between related parties
Loans	0
Collection	0
Others	0
Ending balance	12,396
Gunsan Bio Energy Co., Ltd. | Accumulated impairment [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	(12,396)
Changes in Loans receivable transactions between related parties
Loans	0
Collection	0
Others	0
Ending balance	(12,396)
Bigeum Resident Photovoltaic Power Co., Ltd. | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	11,212
Changes in Loans receivable transactions between related parties
Loans	0
Collection	0
Others	0
Ending balance	11,212
Daejung Offshore Wind Power Co., Ltd. | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	1,000
Changes in Loans receivable transactions between related parties
Loans	0
Collection	0
Others	0
Ending balance	1,000
Bitgoel Eco Energy Co., Ltd. | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	19,349
Changes in Loans receivable transactions between related parties
Loans	16,151
Collection	(710)
Others	0
Ending balance	34,790
Nepal Water Energy Development Company Private Limited [Member] | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	0
Changes in Loans receivable transactions between related parties
Loans	19,914
Collection	0
Others	0
Ending balance	19,914
PT Cirebon Energi Prasarana [Member] | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	0
Changes in Loans receivable transactions between related parties
Loans	28,100
Collection	0
Others	1,469
Ending balance	29,569
Saemangeum Sebit Power Plant [Member] | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	0
Changes in Loans receivable transactions between related parties
Loans	37,249
Collection	0
Others	0
Ending balance	37,249
Solaseado Solar Power Co., Ltd. | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	35,000
Changes in Loans receivable transactions between related parties
Loans	0
Collection	0
Others	0
Ending balance	35,000
Recursos Solares PV De Mexico II, S.A. De C.V. | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	6,134
Changes in Loans receivable transactions between related parties
Loans	1,899
Collection	0
Others	424
Ending balance	8,457
Horus Solar, S.A. De C.V. | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	16,514
Changes in Loans receivable transactions between related parties
Loans	1,695
Collection	0
Others	1,078
Ending balance	19,287
SUNMEX RENOVABLES, S.A. DE C.V. | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	13,571
Changes in Loans receivable transactions between related parties
Loans	1,913
Collection	0
Others	899
Ending balance	16,383
Kelar S.A | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	43,167
Changes in Loans receivable transactions between related parties
Loans	0
Collection	0
Others	798
Ending balance	43,965
DE Energia SpA | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	6,791
Changes in Loans receivable transactions between related parties
Loans	0
Collection	0
Others	469
Ending balance	7,260
Daehan Wind Power PSC | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	13,674
Changes in Loans receivable transactions between related parties
Loans	0
Collection	0
Others	944
Ending balance	14,618
PT. Tanjung Power Indonesia | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	1,090
Changes in Loans receivable transactions between related parties
Loans	0
Collection	(1,114)
Others	24
Ending balance	0
Bitsolar Energy Co., Ltd. | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	3,165
Changes in Loans receivable transactions between related parties
Loans	0
Collection	0
Others	0
Ending balance	3,165
Pulau Indah Power Plant Sdn. Bhd. | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	0
Changes in Loans receivable transactions between related parties
Loans	10,475
Collection	0
Others	(268)
Ending balance	10,207
Guadalupe Solar SpA | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	3,360
Changes in Loans receivable transactions between related parties
Loans	0
Collection	(253)
Others	237
Ending balance	3,344
Foresight Iberian Solar Group Holding, S.L | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	59,333
Changes in Loans receivable transactions between related parties
Loans	0
Collection	0
Others	1,969
Ending balance	61,302
Capman Lynx SCA, SICAR | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	29,770
Changes in Loans receivable transactions between related parties
Loans	0
Collection	0
Others	1,858
Ending balance	31,628
Capman Lynx SCA, SICAR | Accumulated impairment [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	0
Changes in Loans receivable transactions between related parties
Loans	(4,467)
Collection	0
Others	0
Ending balance	(4,467)
Daesan Green Energy Co., Ltd. [Member] | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	0
Changes in Loans receivable transactions between related parties
Loans	3,514
Collection	0
Others	0
Ending balance	3,514
Nghi Son 2 Power LLC [Member] | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	0
Changes in Loans receivable transactions between related parties
Loans	185,306
Collection	0
Others	1,429
Ending balance	186,735
S-Power Co., Ltd. [Member] | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	0
Changes in Loans receivable transactions between related parties
Loans	253
Collection	0
Others	0
Ending balance	₩ 253

Related Parties - Summary of Bo

Related Parties - Summary of Borrowings Arising From Related Party Transactions (Details) - Korea Development Bank ₩ in Millions	12 Months Ended
	Dec. 31, 2022 KRW (₩)
Disclosure of Borrowings transactions between related parties [Line Items]
Beginning balance	₩ 353,324
Changes in Borrowings transactions between related parties [Abstract]
Borrowings	302,222
Repayment	(437,262)
Others	4,213
Ending balance	222,497
Facility
Disclosure of Borrowings transactions between related parties [Line Items]
Beginning balance	98,020
Changes in Borrowings transactions between related parties [Abstract]
Borrowings	61,092
Repayment	(64,875)
Others	2,347
Ending balance	96,584
Others
Disclosure of Borrowings transactions between related parties [Line Items]
Beginning balance	2,509
Changes in Borrowings transactions between related parties [Abstract]
Borrowings	0
Repayment	(376)
Others	0
Ending balance	2,133
Operating funds
Disclosure of Borrowings transactions between related parties [Line Items]
Beginning balance	184,300
Changes in Borrowings transactions between related parties [Abstract]
Borrowings	164,252
Repayment	(285,961)
Others	(158)
Ending balance	62,433
Syndicated Loans
Disclosure of Borrowings transactions between related parties [Line Items]
Beginning balance	14,530
Changes in Borrowings transactions between related parties [Abstract]
Borrowings	0
Repayment	(1,040)
Others	(1,035)
Ending balance	12,455
EBL
Disclosure of Borrowings transactions between related parties [Line Items]
Beginning balance	53,965
Changes in Borrowings transactions between related parties [Abstract]
Borrowings	76,878
Repayment	(85,010)
Others	3,059
Ending balance	₩ 48,892

Related Parties - Summary of Gu

Related Parties - Summary of Guarantees Provided To Related Parties (Details) ر.س in Thousands, $ in Thousands, $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)		Dec. 31, 2022 SAR (ر.س)		Dec. 31, 2022 MXN ($)		Dec. 31, 2022 KRW (₩)
Performance guarantees 1
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation
Name of Principal obligor	Shuweihat Asia Operation & Maintenance Company		Shuweihat Asia Operation & Maintenance Company		Shuweihat Asia Operation & Maintenance Company		Shuweihat Asia Operation & Maintenance Company
Amount of guarantees | $	$ 11,000
Name of Guarantee	Shuweihat Asia Power Investment B.V.		Shuweihat Asia Power Investment B.V.		Shuweihat Asia Power Investment B.V.		Shuweihat Asia Power Investment B.V.
Performance guarantees and others 1
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation
Name of Principal obligor	Rabigh Operation & Maintenance Company Limited		Rabigh Operation & Maintenance Company Limited		Rabigh Operation & Maintenance Company Limited		Rabigh Operation & Maintenance Company Limited
Amount of guarantees | $	$ 1,387
Name of Guarantee	Rabigh Electricity Company		Rabigh Electricity Company		Rabigh Electricity Company		Rabigh Electricity Company
Performance guarantees 2
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation
Name of Principal obligor	Nghi Son 2 Power LLC		Nghi Son 2 Power LLC		Nghi Son 2 Power LLC		Nghi Son 2 Power LLC
Amount of guarantees | $	$ 70,000
Name of Guarantee	SMBC Ho Chi Minh and others		SMBC Ho Chi Minh and others		SMBC Ho Chi Minh and others		SMBC Ho Chi Minh and others
Debt guarantees 1
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation
Name of Principal obligor	Barakah One Company		Barakah One Company		Barakah One Company		Barakah One Company
Amount of guarantees | $	$ 1,223,355
Name of Guarantee	Export-Import Bank of Korea and others		Export-Import Bank of Korea and others		Export-Import Bank of Korea and others		Export-Import Bank of Korea and others
Performance guarantees and others 2
Disclosure of Guarantees provided between the related parties [Line Items]
Amount of guarantees | $	$ 4,197,287
Name of Guarantee	Export-Import Bank of Korea and others		Export-Import Bank of Korea and others		Export-Import Bank of Korea and others		Export-Import Bank of Korea and others
Performance guarantees 3
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Electric Power Corporation	[1]	Korea Electric Power Corporation	[1]	Korea Electric Power Corporation	[1]	Korea Electric Power Corporation	[1]
Name of Principal obligor	RE Holiday Holdings LLC	[1]	RE Holiday Holdings LLC	[1]	RE Holiday Holdings LLC	[1]	RE Holiday Holdings LLC	[1]
Amount of guarantees | $	$ 222,077	[1]
Name of Guarantee	EFS Renewables Holdings, LLC, CA-CIB and others	[1]	EFS Renewables Holdings, LLC, CA-CIB and others	[1]	EFS Renewables Holdings, LLC, CA-CIB and others	[1]	EFS Renewables Holdings, LLC, CA-CIB and others	[1]
Performance guarantees 4
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation
Name of Principal obligor	RE Pioneer Holdings LLC		RE Pioneer Holdings LLC		RE Pioneer Holdings LLC		RE Pioneer Holdings LLC
Amount of guarantees | $	$ 106,873
Name of Guarantee	EFS Renewables Holdings, LLC		EFS Renewables Holdings, LLC		EFS Renewables Holdings, LLC		EFS Renewables Holdings, LLC
Performance guarantees 5
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Electric Power Corporation	[1]	Korea Electric Power Corporation	[1]	Korea Electric Power Corporation	[1]	Korea Electric Power Corporation	[1]
Name of Principal obligor	RE Barren Ridge 1 Holdings LLC	[1]	RE Barren Ridge 1 Holdings LLC	[1]	RE Barren Ridge 1 Holdings LLC	[1]	RE Barren Ridge 1 Holdings LLC	[1]
Amount of guarantees | $	$ 68,838	[1]
Name of Guarantee	Firstar Development, LLC	[1]	Firstar Development, LLC	[1]	Firstar Development, LLC	[1]	Firstar Development, LLC	[1]
Performance guarantees 6
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation
Name of Principal obligor	Rabigh Electricity Company		Rabigh Electricity Company		Rabigh Electricity Company		Rabigh Electricity Company
Amount of guarantees | ر.س			ر.س 1,509
Name of Guarantee	Hana Bank		Hana Bank		Hana Bank		Hana Bank
Performance guarantees 7
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation
Name of Principal obligor	Shuweihat Asia Power Investment B.V.		Shuweihat Asia Power Investment B.V.		Shuweihat Asia Power Investment B.V.		Shuweihat Asia Power Investment B.V.
Amount of guarantees | $	$ 100,000
Name of Guarantee	ING Bank		ING Bank		ING Bank		ING Bank
Performance guarantees 8
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation
Name of Principal obligor	Amman Asia Electric Power Company		Amman Asia Electric Power Company		Amman Asia Electric Power Company		Amman Asia Electric Power Company
Amount of guarantees | $	$ 16,800
Name of Guarantee	Shinhan Bank		Shinhan Bank		Shinhan Bank		Shinhan Bank
Other Performance Guarantees
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation
Name of Principal obligor	Horus Solar, S.A. de C.V.		Horus Solar, S.A. de C.V.		Horus Solar, S.A. de C.V.		Horus Solar, S.A. de C.V.
Amount of guarantees | $					$ 16,413
Name of Guarantee	CENACE and others		CENACE and others		CENACE and others		CENACE and others
Other Performance Guarantees 1
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation
Name of Principal obligor	Recursos Solares PV de Mexico II, S.A. de C.V.		Recursos Solares PV de Mexico II, S.A. de C.V.		Recursos Solares PV de Mexico II, S.A. de C.V.		Recursos Solares PV de Mexico II, S.A. de C.V.
Amount of guarantees | $					$ 1,518
Name of Guarantee	SEMARNAT		SEMARNAT		SEMARNAT		SEMARNAT
Performance guarantees 9
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation
Name of Principal obligor	International Offshore Power Transmission Holding Company Limited		International Offshore Power Transmission Holding Company Limited		International Offshore Power Transmission Holding Company Limited		International Offshore Power Transmission Holding Company Limited
Amount of guarantees | $	$ 150,000
Name of Guarantee	Mizuho Bank		Mizuho Bank		Mizuho Bank		Mizuho Bank
Other performance guarantees 3
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation
Name of Principal obligor	International Offshore Power Transmission Holding Company Limited		International Offshore Power Transmission Holding Company Limited		International Offshore Power Transmission Holding Company Limited		International Offshore Power Transmission Holding Company Limited
Amount of guarantees | $	$ 7,000
Name of Guarantee	Credit Agricole		Credit Agricole		Credit Agricole		Credit Agricole
Collateralized money invested 1
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Electric Power Corporation	[2]	Korea Electric Power Corporation	[2]	Korea Electric Power Corporation	[2]	Korea Electric Power Corporation	[2]
Name of Principal obligor	Pulau Indah Power Plant Sdn. Bhd.	[2]	Pulau Indah Power Plant Sdn. Bhd.	[2]	Pulau Indah Power Plant Sdn. Bhd.	[2]	Pulau Indah Power Plant Sdn. Bhd.	[2]
Amount of guarantees							₩ 13,210	[2]
Name of Guarantee	Malaysian Trustee Berhad	[2]	Malaysian Trustee Berhad	[2]	Malaysian Trustee Berhad	[2]	Malaysian Trustee Berhad	[2]
Collateralized money invested 2
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.
Name of Principal obligor	Cheongna Energy Co., Ltd.		Cheongna Energy Co., Ltd.		Cheongna Energy Co., Ltd.		Cheongna Energy Co., Ltd.
Amount of guarantees							₩ 10,758
Name of Guarantee	Kookmin Bank and others		Kookmin Bank and others		Kookmin Bank and others		Kookmin Bank and others
Guarantees for supplemental funding 1
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.	[3]	Korea Western Power Co., Ltd.	[3]	Korea Western Power Co., Ltd.	[3]	Korea Western Power Co., Ltd.	[3]
Name of Principal obligor	Cheongna Energy Co., Ltd.	[3]	Cheongna Energy Co., Ltd.	[3]	Cheongna Energy Co., Ltd.	[3]	Cheongna Energy Co., Ltd.	[3]
Amount of guarantees							₩ 0	[3]
Name of Guarantee	Kookmin Bank and others	[3]	Kookmin Bank and others	[3]	Kookmin Bank and others	[3]	Kookmin Bank and others	[3]
Collateralized money invested 3
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.
Name of Principal obligor	Xe-Pian Xe-Namnoy Power Co., Ltd.		Xe-Pian Xe-Namnoy Power Co., Ltd.		Xe-Pian Xe-Namnoy Power Co., Ltd.		Xe-Pian Xe-Namnoy Power Co., Ltd.
Amount of guarantees							₩ 115,584
Name of Guarantee	Krung Thai Bank		Krung Thai Bank		Krung Thai Bank		Krung Thai Bank
Impounding bonus guarantees
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.
Name of Principal obligor	Xe-Pian Xe-Namnoy Power Co., Ltd.		Xe-Pian Xe-Namnoy Power Co., Ltd.		Xe-Pian Xe-Namnoy Power Co., Ltd.		Xe-Pian Xe-Namnoy Power Co., Ltd.
Amount of guarantees | $	$ 5,000
Name of Guarantee	SK E&C		SK E&C		SK E&C		SK E&C
Other performance guarantees 4
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.
Name of Principal obligor	Rabigh Operation & Maintenance Company Limited		Rabigh Operation & Maintenance Company Limited		Rabigh Operation & Maintenance Company Limited		Rabigh Operation & Maintenance Company Limited
Amount of guarantees | ر.س			ر.س 11,200
Name of Guarantee	National Bank of Kuwait		National Bank of Kuwait		National Bank of Kuwait		National Bank of Kuwait
Collateralized money invested 4
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.
Name of Principal obligor	Daegu Photovoltaic Co., Ltd.		Daegu Photovoltaic Co., Ltd.		Daegu Photovoltaic Co., Ltd.		Daegu Photovoltaic Co., Ltd.
Amount of guarantees							₩ 2,849
Name of Guarantee	Korea Development Bank		Korea Development Bank		Korea Development Bank		Korea Development Bank
Collateralized money invested 5
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.	[4]	Korea Western Power Co., Ltd.	[4]	Korea Western Power Co., Ltd.	[4]	Korea Western Power Co., Ltd.	[4]
Name of Principal obligor	Dongducheon Dream Power Co., Ltd.	[4]	Dongducheon Dream Power Co., Ltd.	[4]	Dongducheon Dream Power Co., Ltd.	[4]	Dongducheon Dream Power Co., Ltd.	[4]
Amount of guarantees							₩ 52,476	[4]
Name of Guarantee	Kookmin Bank and others	[4]	Kookmin Bank and others	[4]	Kookmin Bank and others	[4]	Kookmin Bank and others	[4]
Debt guarantees 2
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.
Name of Principal obligor	Dongducheon Dream Power Co., Ltd.		Dongducheon Dream Power Co., Ltd.		Dongducheon Dream Power Co., Ltd.		Dongducheon Dream Power Co., Ltd.
Amount of guarantees							₩ 20,300
Name of Guarantee	BNK Securities		BNK Securities		BNK Securities		BNK Securities
Collateralized money invested 7
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.
Name of Principal obligor	Haeng Bok Do Si Photovoltaic Power Co., Ltd.		Haeng Bok Do Si Photovoltaic Power Co., Ltd.		Haeng Bok Do Si Photovoltaic Power Co., Ltd.		Haeng Bok Do Si Photovoltaic Power Co., Ltd.
Amount of guarantees							₩ 278
Name of Guarantee	Nonghyup Bank		Nonghyup Bank		Nonghyup Bank		Nonghyup Bank
Collateralized money invested 6
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.
Name of Principal obligor	PT. Mutiara Jawa		PT. Mutiara Jawa		PT. Mutiara Jawa		PT. Mutiara Jawa
Amount of guarantees							₩ 3,597
Name of Guarantee	Woori Bank		Woori Bank		Woori Bank		Woori Bank
Collateralized money invested 8
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.
Name of Principal obligor	Shin Pyeongtaek Power Co., Ltd.		Shin Pyeongtaek Power Co., Ltd.		Shin Pyeongtaek Power Co., Ltd.		Shin Pyeongtaek Power Co., Ltd.
Amount of guarantees							₩ 133,823
Name of Guarantee	Kookmin Bank and others		Kookmin Bank and others		Kookmin Bank and others		Kookmin Bank and others
Guarantees for supplemental funding 2
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.	[3]	Korea Western Power Co., Ltd.	[3]	Korea Western Power Co., Ltd.	[3]	Korea Western Power Co., Ltd.	[3]
Name of Principal obligor	Shin Pyeongtaek Power Co., Ltd.	[3]	Shin Pyeongtaek Power Co., Ltd.	[3]	Shin Pyeongtaek Power Co., Ltd.	[3]	Shin Pyeongtaek Power Co., Ltd.	[3]
Amount of guarantees							₩ 0	[3]
Name of Guarantee	Kookmin Bank and others	[3]	Kookmin Bank and others	[3]	Kookmin Bank and others	[3]	Kookmin Bank and others	[3]
Collateralized money invested 9
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.
Name of Principal obligor	Haemodum Solar Co., Ltd.		Haemodum Solar Co., Ltd.		Haemodum Solar Co., Ltd.		Haemodum Solar Co., Ltd.
Amount of guarantees							₩ 3,367
Name of Guarantee	Nonghyup Bank		Nonghyup Bank		Nonghyup Bank		Nonghyup Bank
Collateralized money invested 10
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.
Name of Principal obligor	Muan Solar Park Co., Ltd.		Muan Solar Park Co., Ltd.		Muan Solar Park Co., Ltd.		Muan Solar Park Co., Ltd.
Amount of guarantees							₩ 7,838
Name of Guarantee	IBK and others		IBK and others		IBK and others		IBK and others
Collateralized money invested 11
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.
Name of Principal obligor	Anjwa Smart Farm & Solar City Co., Ltd.		Anjwa Smart Farm & Solar City Co., Ltd.		Anjwa Smart Farm & Solar City Co., Ltd.		Anjwa Smart Farm & Solar City Co., Ltd.
Amount of guarantees							₩ 8,662
Name of Guarantee	Hana Bank and others		Hana Bank and others		Hana Bank and others		Hana Bank and others
Collateralized money invested 12
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.
Name of Principal obligor	Seoroseoro Sunny Power Plant Co., Ltd.		Seoroseoro Sunny Power Plant Co., Ltd.		Seoroseoro Sunny Power Plant Co., Ltd.		Seoroseoro Sunny Power Plant Co., Ltd.
Amount of guarantees							₩ 859
Name of Guarantee	Hana Bank and others		Hana Bank and others		Hana Bank and others		Hana Bank and others
Collateralized money invested 13
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.
Name of Principal obligor	YuDang Solar Co., Ltd.		YuDang Solar Co., Ltd.		YuDang Solar Co., Ltd.		YuDang Solar Co., Ltd.
Amount of guarantees							₩ 586
Name of Guarantee	Hana Bank and others		Hana Bank and others		Hana Bank and others		Hana Bank and others
Guarantees for supplemental funding 3
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.	[3]	Korea Western Power Co., Ltd.	[3]	Korea Western Power Co., Ltd.	[3]	Korea Western Power Co., Ltd.	[3]
Name of Principal obligor	YuDang Solar Co., Ltd.	[3]	YuDang Solar Co., Ltd.	[3]	YuDang Solar Co., Ltd.	[3]	YuDang Solar Co., Ltd.	[3]
Amount of guarantees							₩ 0	[3]
Name of Guarantee	Hana Bank and others	[3]	Hana Bank and others	[3]	Hana Bank and others	[3]	Hana Bank and others	[3]
Collateralized money invested 14
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.
Name of Principal obligor	Hapcheon Floating Photovoltaic Power Plant Inc.		Hapcheon Floating Photovoltaic Power Plant Inc.		Hapcheon Floating Photovoltaic Power Plant Inc.		Hapcheon Floating Photovoltaic Power Plant Inc.
Amount of guarantees							₩ 8,471
Name of Guarantee	Nonghyup Bank and others		Nonghyup Bank and others		Nonghyup Bank and others		Nonghyup Bank and others
Collateralized money invested 15
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.
Name of Principal obligor	Yeongwol Eco Wind Co., Ltd.		Yeongwol Eco Wind Co., Ltd.		Yeongwol Eco Wind Co., Ltd.		Yeongwol Eco Wind Co., Ltd.
Amount of guarantees							₩ 3,155
Name of Guarantee	Hana Bank and others		Hana Bank and others		Hana Bank and others		Hana Bank and others
Guarantees for supplemental funding 4
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.	[3]	Korea Western Power Co., Ltd.	[3]	Korea Western Power Co., Ltd.	[3]	Korea Western Power Co., Ltd.	[3]
Name of Principal obligor	Yeongwol Eco Wind Co., Ltd.	[3]	Yeongwol Eco Wind Co., Ltd.	[3]	Yeongwol Eco Wind Co., Ltd.	[3]	Yeongwol Eco Wind Co., Ltd.	[3]
Amount of guarantees							₩ 0	[3]
Name of Guarantee	Hana Bank and others	[3]	Hana Bank and others	[3]	Hana Bank and others	[3]	Hana Bank and others	[3]
Collateralized money invested 16
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.		Korea Western Power Co., Ltd.
Name of Principal obligor	Gurae Resident Power Co., Ltd.		Gurae Resident Power Co., Ltd.		Gurae Resident Power Co., Ltd.		Gurae Resident Power Co., Ltd.
Amount of guarantees							₩ 391
Name of Guarantee	Hana Bank and others		Hana Bank and others		Hana Bank and others		Hana Bank and others
Guarantees for supplemental funding 5
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd.	[3]	Korea Western Power Co., Ltd.	[3]	Korea Western Power Co., Ltd.	[3]	Korea Western Power Co., Ltd.	[3]
Name of Principal obligor	Gurae Resident Power Co., Ltd.	[3]	Gurae Resident Power Co., Ltd.	[3]	Gurae Resident Power Co., Ltd.	[3]	Gurae Resident Power Co., Ltd.	[3]
Amount of guarantees							₩ 0	[3]
Name of Guarantee	Hana Bank and others	[3]	Hana Bank and others	[3]	Hana Bank and others	[3]	Hana Bank and others	[3]
Collateralized money invested 17
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd		Korea Western Power Co., Ltd		Korea Western Power Co., Ltd		Korea Western Power Co., Ltd
Name of Principal obligor	Gunsan Land Solar Co., Ltd.		Gunsan Land Solar Co., Ltd.		Gunsan Land Solar Co., Ltd.		Gunsan Land Solar Co., Ltd.
Amount of guarantees							₩ 27,544
Name of Guarantee	Hana Bank and others		Hana Bank and others		Hana Bank and others		Hana Bank and others
Guarantees for supplemental funding 6
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd	[3]	Korea Western Power Co., Ltd	[3]	Korea Western Power Co., Ltd	[3]	Korea Western Power Co., Ltd	[3]
Name of Principal obligor	Gunsan Land Solar Co., Ltd.	[3]	Gunsan Land Solar Co., Ltd.	[3]	Gunsan Land Solar Co., Ltd.	[3]	Gunsan Land Solar Co., Ltd.	[3]
Amount of guarantees							₩ 0	[3]
Name of Guarantee	Hana Bank and others	[3]	Hana Bank and others	[3]	Hana Bank and others	[3]	Hana Bank and others	[3]
Collateralized money invested 18
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd		Korea Western Power Co., Ltd		Korea Western Power Co., Ltd		Korea Western Power Co., Ltd
Name of Principal obligor	Seobusambo highway photovoltaics Co., Ltd.		Seobusambo highway photovoltaics Co., Ltd.		Seobusambo highway photovoltaics Co., Ltd.		Seobusambo highway photovoltaics Co., Ltd.
Amount of guarantees							₩ 3,067
Name of Guarantee	Hana Bank and others		Hana Bank and others		Hana Bank and others		Hana Bank and others
Guarantees for supplemental funding 7
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd	[3]	Korea Western Power Co., Ltd	[3]	Korea Western Power Co., Ltd	[3]	Korea Western Power Co., Ltd	[3]
Name of Principal obligor	Seobusambo highway photovoltaics Co., Ltd.	[3]	Seobusambo highway photovoltaics Co., Ltd.	[3]	Seobusambo highway photovoltaics Co., Ltd.	[3]	Seobusambo highway photovoltaics Co., Ltd.	[3]
Amount of guarantees							₩ 0	[3]
Name of Guarantee	Hana Bank and others	[3]	Hana Bank and others	[3]	Hana Bank and others	[3]	Hana Bank and others	[3]
Collateralized money invested 19
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd		Korea Western Power Co., Ltd		Korea Western Power Co., Ltd		Korea Western Power Co., Ltd
Name of Principal obligor	Eumseong Eco Park Co., Ltd.		Eumseong Eco Park Co., Ltd.		Eumseong Eco Park Co., Ltd.		Eumseong Eco Park Co., Ltd.
Amount of guarantees							₩ 5,557
Name of Guarantee	Kyobo Life Insurance Co., Ltd. and others		Kyobo Life Insurance Co., Ltd. and others		Kyobo Life Insurance Co., Ltd. and others		Kyobo Life Insurance Co., Ltd. and others
Guarantees for supplemental funding 8
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd	[3]	Korea Western Power Co., Ltd	[3]	Korea Western Power Co., Ltd	[3]	Korea Western Power Co., Ltd	[3]
Name of Principal obligor	Eumseong Eco Park Co., Ltd.	[3]	Eumseong Eco Park Co., Ltd.	[3]	Eumseong Eco Park Co., Ltd.	[3]	Eumseong Eco Park Co., Ltd.	[3]
Amount of guarantees							₩ 0	[3]
Name of Guarantee	Kyobo Life Insurance Co., Ltd. and others	[3]	Kyobo Life Insurance Co., Ltd. and others	[3]	Kyobo Life Insurance Co., Ltd. and others	[3]	Kyobo Life Insurance Co., Ltd. and others	[3]
Collateralized money invested 20
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Western Power Co., Ltd		Korea Western Power Co., Ltd		Korea Western Power Co., Ltd		Korea Western Power Co., Ltd
Name of Principal obligor	PungBack Wind Farm Corporation		PungBack Wind Farm Corporation		PungBack Wind Farm Corporation		PungBack Wind Farm Corporation
Amount of guarantees							₩ 6,743
Name of Guarantee	Hanwha Life Insurance Co., Ltd and others		Hanwha Life Insurance Co., Ltd and others		Hanwha Life Insurance Co., Ltd and others		Hanwha Life Insurance Co., Ltd and others
Collateralized money invested 21
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Principal obligor	Busan Shinho Solar Power Co., Ltd.		Busan Shinho Solar Power Co., Ltd.		Busan Shinho Solar Power Co., Ltd.		Busan Shinho Solar Power Co., Ltd.
Amount of guarantees							₩ 6,719
Name of Guarantee	Korea Development Bank and others		Korea Development Bank and others		Korea Development Bank and others		Korea Development Bank and others
Collateralized money invested 22
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Principal obligor	Seokmun Energy Co., Ltd.		Seokmun Energy Co., Ltd.		Seokmun Energy Co., Ltd.		Seokmun Energy Co., Ltd.
Amount of guarantees							₩ 17,336
Name of Guarantee	Kookmin Bank and others		Kookmin Bank and others		Kookmin Bank and others		Kookmin Bank and others
Guarantees for supplemental funding 9
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.	[3]	Korea East-West Power Co., Ltd.	[3]	Korea East-West Power Co., Ltd.	[3]	Korea East-West Power Co., Ltd.	[3]
Name of Principal obligor	Seokmun Energy Co., Ltd.	[3]	Seokmun Energy Co., Ltd.	[3]	Seokmun Energy Co., Ltd.	[3]	Seokmun Energy Co., Ltd.	[3]
Amount of guarantees							₩ 0	[3]
Name of Guarantee	Kookmin Bank and others	[3]	Kookmin Bank and others	[3]	Kookmin Bank and others	[3]	Kookmin Bank and others	[3]
Collateralized money invested 23
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Principal obligor	Chun-cheon Energy Co., Ltd.		Chun-cheon Energy Co., Ltd.		Chun-cheon Energy Co., Ltd.		Chun-cheon Energy Co., Ltd.
Amount of guarantees							₩ 32,044
Name of Guarantee	Kookmin Bank and others		Kookmin Bank and others		Kookmin Bank and others		Kookmin Bank and others
Guarantees for supplemental funding 10
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.	[3]	Korea East-West Power Co., Ltd.	[3]	Korea East-West Power Co., Ltd.	[3]	Korea East-West Power Co., Ltd.	[3]
Name of Principal obligor	Chun-cheon Energy Co., Ltd.	[3]	Chun-cheon Energy Co., Ltd.	[3]	Chun-cheon Energy Co., Ltd.	[3]	Chun-cheon Energy Co., Ltd.	[3]
Amount of guarantees							₩ 90,800	[3]
Name of Guarantee	Kookmin Bank and others	[3]	Kookmin Bank and others	[3]	Kookmin Bank and others	[3]	Kookmin Bank and others	[3]
Collateralized money invested 24
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Principal obligor	Honam Wind Power Co., Ltd.		Honam Wind Power Co., Ltd.		Honam Wind Power Co., Ltd.		Honam Wind Power Co., Ltd.
Amount of guarantees							₩ 4,819
Name of Guarantee	Shinhan Bank and others		Shinhan Bank and others		Shinhan Bank and others		Shinhan Bank and others
Guarantees for supplemental funding 11
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.	[3]	Korea East-West Power Co., Ltd.	[3]	Korea East-West Power Co., Ltd.	[3]	Korea East-West Power Co., Ltd.	[3]
Name of Principal obligor	Honam Wind Power Co., Ltd.	[3]	Honam Wind Power Co., Ltd.	[3]	Honam Wind Power Co., Ltd.	[3]	Honam Wind Power Co., Ltd.	[3]
Amount of guarantees							₩ 0	[3]
Name of Guarantee	Shinhan Bank and others	[3]	Shinhan Bank and others	[3]	Shinhan Bank and others	[3]	Shinhan Bank and others	[3]
Collateralized money invested 25
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Principal obligor	GS Donghae Electric Power Co., Ltd.		GS Donghae Electric Power Co., Ltd.		GS Donghae Electric Power Co., Ltd.		GS Donghae Electric Power Co., Ltd.
Amount of guarantees							₩ 260,145
Name of Guarantee	Korea Development Bank and others		Korea Development Bank and others		Korea Development Bank and others		Korea Development Bank and others
Collateralized money invested 26
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Principal obligor	Yeonggwangbaeksu Wind Power Co., Ltd.		Yeonggwangbaeksu Wind Power Co., Ltd.		Yeonggwangbaeksu Wind Power Co., Ltd.		Yeonggwangbaeksu Wind Power Co., Ltd.
Amount of guarantees							₩ 3,151
Name of Guarantee	Kookmin Bank and others		Kookmin Bank and others		Kookmin Bank and others		Kookmin Bank and others
Collateralized money invested 27
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Principal obligor	Yeonggwang Wind Power Co., Ltd.		Yeonggwang Wind Power Co., Ltd.		Yeonggwang Wind Power Co., Ltd.		Yeonggwang Wind Power Co., Ltd.
Amount of guarantees							₩ 20,713
Name of Guarantee	KDB Capital Corporation and others		KDB Capital Corporation and others		KDB Capital Corporation and others		KDB Capital Corporation and others
Collateralized money invested 28
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Principal obligor	Daesan Green Energy Co., Ltd.		Daesan Green Energy Co., Ltd.		Daesan Green Energy Co., Ltd.		Daesan Green Energy Co., Ltd.
Amount of guarantees							₩ 19,218
Name of Guarantee	IBK		IBK		IBK		IBK
Guarantees for supplemental funding 12
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.	[3]	Korea East-West Power Co., Ltd.	[3]	Korea East-West Power Co., Ltd.	[3]	Korea East-West Power Co., Ltd.	[3]
Name of Principal obligor	Daesan Green Energy Co., Ltd.	[3]	Daesan Green Energy Co., Ltd.	[3]	Daesan Green Energy Co., Ltd.	[3]	Daesan Green Energy Co., Ltd.	[3]
Amount of guarantees							₩ 0	[3]
Name of Guarantee	IBK	[3]	IBK	[3]	IBK	[3]	IBK	[3]
Collateralized money invested 29
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Principal obligor	Taebaek Gadeoksan Wind Power Co., Ltd.		Taebaek Gadeoksan Wind Power Co., Ltd.		Taebaek Gadeoksan Wind Power Co., Ltd.		Taebaek Gadeoksan Wind Power Co., Ltd.
Amount of guarantees							₩ 20,040
Name of Guarantee	Hana Bank and others		Hana Bank and others		Hana Bank and others		Hana Bank and others
Guarantees for supplemental funding 13
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.	[3]	Korea East-West Power Co., Ltd.	[3]	Korea East-West Power Co., Ltd.	[3]	Korea East-West Power Co., Ltd.	[3]
Name of Principal obligor	Taebaek Gadeoksan Wind Power Co., Ltd.	[3]	Taebaek Gadeoksan Wind Power Co., Ltd.	[3]	Taebaek Gadeoksan Wind Power Co., Ltd.	[3]	Taebaek Gadeoksan Wind Power Co., Ltd.	[3]
Amount of guarantees							₩ 0	[3]
Name of Guarantee	Hana Bank and others	[3]	Hana Bank and others	[3]	Hana Bank and others	[3]	Hana Bank and others	[3]
Other guarantees
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Principal obligor	PT. Tanjung Power Indonesia		PT. Tanjung Power Indonesia		PT. Tanjung Power Indonesia		PT. Tanjung Power Indonesia
Amount of guarantees | $	$ 3,150
Name of Guarantee	PT. Adaro Indonesia		PT. Adaro Indonesia		PT. Adaro Indonesia		PT. Adaro Indonesia
Guarantees for supplemental funding 14
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.	[3]	Korea East-West Power Co., Ltd.	[3]	Korea East-West Power Co., Ltd.	[3]	Korea East-West Power Co., Ltd.	[3]
Name of Principal obligor	PT. Tanjung Power Indonesia	[3]	PT. Tanjung Power Indonesia	[3]	PT. Tanjung Power Indonesia	[3]	PT. Tanjung Power Indonesia	[3]
Amount of guarantees							₩ 0	[3]
Name of Guarantee	Sumitomo mitsui banking and others	[3]	Sumitomo mitsui banking and others	[3]	Sumitomo mitsui banking and others	[3]	Sumitomo mitsui banking and others	[3]
Collateralized money invested 30
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Principal obligor	PT. Tanjung Power Indonesia		PT. Tanjung Power Indonesia		PT. Tanjung Power Indonesia		PT. Tanjung Power Indonesia
Amount of guarantees							₩ 92,907
Name of Guarantee	MUFG and others		MUFG and others		MUFG and others		MUFG and others
Performance guarantees 10
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Principal obligor	South Jamaica Power Company Limited		South Jamaica Power Company Limited		South Jamaica Power Company Limited		South Jamaica Power Company Limited
Amount of guarantees | $	$ 14,400
Name of Guarantee	Credit Agricole Corporate & Investment Bank Seoul and others		Credit Agricole Corporate & Investment Bank Seoul and others		Credit Agricole Corporate & Investment Bank Seoul and others		Credit Agricole Corporate & Investment Bank Seoul and others
Collateralized money invested 31
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Principal obligor	South Jamaica Power Company Limited		South Jamaica Power Company Limited		South Jamaica Power Company Limited		South Jamaica Power Company Limited
Amount of guarantees							₩ 46,437
Name of Guarantee	JCSD Trustee Services Limited and others		JCSD Trustee Services Limited and others		JCSD Trustee Services Limited and others		JCSD Trustee Services Limited and others
Collateralized money invested 32
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Principal obligor	DE Energia SpA		DE Energia SpA		DE Energia SpA		DE Energia SpA
Amount of guarantees							₩ 9,536
Name of Guarantee	Mirae Asset Daewoo Co., Ltd. and others		Mirae Asset Daewoo Co., Ltd. and others		Mirae Asset Daewoo Co., Ltd. and others		Mirae Asset Daewoo Co., Ltd. and others
Collateralized Loans [Member]
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Principal obligor	DE Energia SpA		DE Energia SpA		DE Energia SpA		DE Energia SpA
Amount of guarantees | $	$ 5,728
Payment guarantees 1
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.	[5]	Korea East-West Power Co., Ltd.	[5]	Korea East-West Power Co., Ltd.	[5]	Korea East-West Power Co., Ltd.	[5]
Name of Principal obligor	DE Energia SpA	[5]	DE Energia SpA	[5]	DE Energia SpA	[5]	DE Energia SpA	[5]
Amount of guarantees | $	$ 943	[5]
Name of Guarantee	Hana Bank	[5]	Hana Bank	[5]	Hana Bank	[5]	Hana Bank	[5]
Collateralized money invested 33
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Principal obligor	Bitsolar Energy Co., Ltd.		Bitsolar Energy Co., Ltd.		Bitsolar Energy Co., Ltd.		Bitsolar Energy Co., Ltd.
Amount of guarantees							₩ 352
Name of Guarantee	Mirae Asset Life Insurance Co., Ltd. and others		Mirae Asset Life Insurance Co., Ltd. and others		Mirae Asset Life Insurance Co., Ltd. and others		Mirae Asset Life Insurance Co., Ltd. and others
Collateralized money invested 34
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Principal obligor	Cheongju Eco Park Co., Ltd.		Cheongju Eco Park Co., Ltd.		Cheongju Eco Park Co., Ltd.		Cheongju Eco Park Co., Ltd.
Amount of guarantees							₩ 10,490
Name of Guarantee	Kyobo Life Insurance Co., Ltd. and others		Kyobo Life Insurance Co., Ltd. and others		Kyobo Life Insurance Co., Ltd. and others		Kyobo Life Insurance Co., Ltd. and others
Collateralized money invested 35
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Principal obligor	Busan Industrial Solar Power Co., Ltd.		Busan Industrial Solar Power Co., Ltd.		Busan Industrial Solar Power Co., Ltd.		Busan Industrial Solar Power Co., Ltd.
Amount of guarantees							₩ 1,168
Name of Guarantee	Shinhan Bank and others		Shinhan Bank and others		Shinhan Bank and others		Shinhan Bank and others
Guarantees for supplemental funding 15
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.	[3]	Korea East-West Power Co., Ltd.	[3]	Korea East-West Power Co., Ltd.	[3]	Korea East-West Power Co., Ltd.	[3]
Name of Principal obligor	Busan Industrial Solar Power Co., Ltd.	[3]	Busan Industrial Solar Power Co., Ltd.	[3]	Busan Industrial Solar Power Co., Ltd.	[3]	Busan Industrial Solar Power Co., Ltd.	[3]
Amount of guarantees							₩ 0	[3]
Name of Guarantee	Shinhan Bank and others	[3]	Shinhan Bank and others	[3]	Shinhan Bank and others	[3]	Shinhan Bank and others	[3]
Collateralized money invested 36
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Principal obligor	Yangyang Wind Power Co., Ltd.		Yangyang Wind Power Co., Ltd.		Yangyang Wind Power Co., Ltd.		Yangyang Wind Power Co., Ltd.
Amount of guarantees							₩ 10,864
Name of Guarantee	Hana Bank and others		Hana Bank and others		Hana Bank and others		Hana Bank and others
Guarantees for supplemental funding 16
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.	[3]	Korea East-West Power Co., Ltd.	[3]	Korea East-West Power Co., Ltd.	[3]	Korea East-West Power Co., Ltd.	[3]
Name of Principal obligor	Yangyang Wind Power Co., Ltd.	[3]	Yangyang Wind Power Co., Ltd.	[3]	Yangyang Wind Power Co., Ltd.	[3]	Yangyang Wind Power Co., Ltd.	[3]
Amount of guarantees							₩ 0	[3]
Name of Guarantee	Hana Bank and others	[3]	Hana Bank and others	[3]	Hana Bank and others	[3]	Hana Bank and others	[3]
Collateralized money invested 37
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Principal obligor	Daewon Green Energy Co., Ltd.		Daewon Green Energy Co., Ltd.		Daewon Green Energy Co., Ltd.		Daewon Green Energy Co., Ltd.
Amount of guarantees							₩ 4,485
Name of Guarantee	Hana Bank and others		Hana Bank and others		Hana Bank and others		Hana Bank and others
Guarantees for supplemental funding 17
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.	[3]	Korea East-West Power Co., Ltd.	[3]	Korea East-West Power Co., Ltd.	[3]	Korea East-West Power Co., Ltd.	[3]
Name of Principal obligor	Daewon Green Energy Co., Ltd.	[3]	Daewon Green Energy Co., Ltd.	[3]	Daewon Green Energy Co., Ltd.	[3]	Daewon Green Energy Co., Ltd.	[3]
Amount of guarantees							₩ 0	[3]
Name of Guarantee	Hana Bank and others	[3]	Hana Bank and others	[3]	Hana Bank and others	[3]	Hana Bank and others	[3]
Collateralized money invested 38
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Principal obligor	Goheung New Energy Co., Ltd.		Goheung New Energy Co., Ltd.		Goheung New Energy Co., Ltd.		Goheung New Energy Co., Ltd.
Amount of guarantees							₩ 3,615
Name of Guarantee	Woori Bank and others		Woori Bank and others		Woori Bank and others		Woori Bank and others
Guarantees for supplemental funding 18
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.	[3]	Korea East-West Power Co., Ltd.	[3]	Korea East-West Power Co., Ltd.	[3]	Korea East-West Power Co., Ltd.	[3]
Name of Principal obligor	Goheung New Energy Co., Ltd.	[3]	Goheung New Energy Co., Ltd.	[3]	Goheung New Energy Co., Ltd.	[3]	Goheung New Energy Co., Ltd.	[3]
Amount of guarantees							₩ 0	[3]
Name of Guarantee	Woori Bank and others	[3]	Woori Bank and others	[3]	Woori Bank and others	[3]	Woori Bank and others	[3]
Collateralized money invested 39
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.		Korea East-West Power Co., Ltd.
Name of Principal obligor	Seungmun Green Energy		Seungmun Green Energy		Seungmun Green Energy		Seungmun Green Energy
Amount of guarantees							₩ 9,055
Name of Guarantee	Hana Bank and others		Hana Bank and others		Hana Bank and others		Hana Bank and others
Collateralized money invested 40
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.
Name of Principal obligor	KNH Solar Co., Ltd.		KNH Solar Co., Ltd.		KNH Solar Co., Ltd.		KNH Solar Co., Ltd.
Amount of guarantees							₩ 2,883
Name of Guarantee	Shinhan Bank and others		Shinhan Bank and others		Shinhan Bank and others		Shinhan Bank and others
Performance guarantees and guarantees for supplemental funding
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.	[3]	Korea Southern Power Co., Ltd.	[3]	Korea Southern Power Co., Ltd.	[3]	Korea Southern Power Co., Ltd.	[3]
Name of Principal obligor	KNH Solar Co., Ltd.	[3]	KNH Solar Co., Ltd.	[3]	KNH Solar Co., Ltd.	[3]	KNH Solar Co., Ltd.	[3]
Amount of guarantees							₩ 0	[3]
Name of Guarantee	Shinhan Bank and others	[3]	Shinhan Bank and others	[3]	Shinhan Bank and others	[3]	Shinhan Bank and others	[3]
Collateralized money invested 41
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.
Name of Principal obligor	Daeryun Power Co., Ltd.		Daeryun Power Co., Ltd.		Daeryun Power Co., Ltd.		Daeryun Power Co., Ltd.
Amount of guarantees							₩ 26,727
Name of Guarantee	Korea Development Bank and others		Korea Development Bank and others		Korea Development Bank and others		Korea Development Bank and others
Collateralized money invested 42
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.
Name of Principal obligor	Daegu Green Power Co., Ltd.		Daegu Green Power Co., Ltd.		Daegu Green Power Co., Ltd.		Daegu Green Power Co., Ltd.
Amount of guarantees							₩ 29,360
Name of Guarantee	Shinhan Bank and others		Shinhan Bank and others		Shinhan Bank and others		Shinhan Bank and others
Performance guarantees 11
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.
Name of Principal obligor	Daegu Green Power Co., Ltd.		Daegu Green Power Co., Ltd.		Daegu Green Power Co., Ltd.		Daegu Green Power Co., Ltd.
Amount of guarantees							₩ 0
Name of Guarantee	Shinhan Bank and others		Shinhan Bank and others		Shinhan Bank and others		Shinhan Bank and others
Performance guarantees 12
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.
Name of Principal obligor	Kelar S.A.		Kelar S.A.		Kelar S.A.		Kelar S.A.
Amount of guarantees | $	$ 54,282
Name of Guarantee	Hana Bank, MUFG		Hana Bank, MUFG		Hana Bank, MUFG		Hana Bank, MUFG
Performance guarantees 13
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.
Name of Principal obligor	Daehan Wind Power PSC		Daehan Wind Power PSC		Daehan Wind Power PSC		Daehan Wind Power PSC
Amount of guarantees | $	$ 1,800
Name of Guarantee	Shinhan Bank		Shinhan Bank		Shinhan Bank		Shinhan Bank
Payment guarantees 2
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.	[6]	Korea Southern Power Co., Ltd.	[6]	Korea Southern Power Co., Ltd.	[6]	Korea Southern Power Co., Ltd.	[6]
Name of Principal obligor	Daehan Wind Power PSC	[6]	Daehan Wind Power PSC	[6]	Daehan Wind Power PSC	[6]	Daehan Wind Power PSC	[6]
Amount of guarantees | $	$ 1,900	[6]
Name of Guarantee	Hana Bank	[6]	Hana Bank	[6]	Hana Bank	[6]	Hana Bank	[6]
Collateralized money invested 43
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.
Name of Principal obligor	Daehan Wind Power PSC		Daehan Wind Power PSC		Daehan Wind Power PSC		Daehan Wind Power PSC
Amount of guarantees							₩ 13,923
Name of Guarantee	Standard Chartered		Standard Chartered		Standard Chartered		Standard Chartered
Collateralized money invested 44
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.
Name of Principal obligor	Pyeongchang Wind Power Co., Ltd.		Pyeongchang Wind Power Co., Ltd.		Pyeongchang Wind Power Co., Ltd.		Pyeongchang Wind Power Co., Ltd.
Amount of guarantees							₩ 14,464
Name of Guarantee	Woori Bank and Shinhan Bank and others		Woori Bank and Shinhan Bank and others		Woori Bank and Shinhan Bank and others		Woori Bank and Shinhan Bank and others
Performance guarantees 14
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.
Name of Principal obligor	Pyeongchang Wind Power Co., Ltd.		Pyeongchang Wind Power Co., Ltd.		Pyeongchang Wind Power Co., Ltd.		Pyeongchang Wind Power Co., Ltd.
Amount of guarantees							₩ 0
Collateralized money invested 45
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.
Name of Principal obligor	Taebaek Guinemi Wind Power Co., Ltd.		Taebaek Guinemi Wind Power Co., Ltd.		Taebaek Guinemi Wind Power Co., Ltd.		Taebaek Guinemi Wind Power Co., Ltd.
Amount of guarantees							₩ 13,049
Name of Guarantee	IBK		IBK		IBK		IBK
Payment guarantees 3
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.	[7]	Korea Southern Power Co., Ltd.	[7]	Korea Southern Power Co., Ltd.	[7]	Korea Southern Power Co., Ltd.	[7]
Name of Principal obligor	Samcheok Eco Materials Co., Ltd.	[7]	Samcheok Eco Materials Co., Ltd.	[7]	Samcheok Eco Materials Co., Ltd.	[7]	Samcheok Eco Materials Co., Ltd.	[7]
Amount of guarantees							₩ 0	[7]
Name of Guarantee	SEM Investment Co., Ltd.	[7]	SEM Investment Co., Ltd.	[7]	SEM Investment Co., Ltd.	[7]	SEM Investment Co., Ltd.	[7]
Collateralized money invested 46
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.
Name of Principal obligor	Solaseado Solar Power Co., Ltd.		Solaseado Solar Power Co., Ltd.		Solaseado Solar Power Co., Ltd.		Solaseado Solar Power Co., Ltd.
Amount of guarantees							₩ 12,088
Name of Guarantee	Kookmin Bank and others		Kookmin Bank and others		Kookmin Bank and others		Kookmin Bank and others
Collateralized money invested 47
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.	[8]	Korea Southern Power Co., Ltd.	[8]	Korea Southern Power Co., Ltd.	[8]	Korea Southern Power Co., Ltd.	[8]
Name of Principal obligor	Naepo Green Energy Co., Ltd.	[8]	Naepo Green Energy Co., Ltd.	[8]	Naepo Green Energy Co., Ltd.	[8]	Naepo Green Energy Co., Ltd.	[8]
Amount of guarantees							₩ 0	[8]
Name of Guarantee	IBK and others	[8]	IBK and others	[8]	IBK and others	[8]	IBK and others	[8]
Guarantees for other supplemental funding and performance guarantees
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.	[3]	Korea Southern Power Co., Ltd.	[3]	Korea Southern Power Co., Ltd.	[3]	Korea Southern Power Co., Ltd.	[3]
Name of Principal obligor	Naepo Green Energy Co., Ltd.	[3]	Naepo Green Energy Co., Ltd.	[3]	Naepo Green Energy Co., Ltd.	[3]	Naepo Green Energy Co., Ltd.	[3]
Amount of guarantees							₩ 0	[3]
Name of Guarantee	IBK and others	[3]	IBK and others	[3]	IBK and others	[3]	IBK and others	[3]
Guarantees for supplemental funding 19
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.	[3]	Korea Southern Power Co., Ltd.	[3]	Korea Southern Power Co., Ltd.	[3]	Korea Southern Power Co., Ltd.	[3]
Name of Principal obligor	Naepo Green Energy Co., Ltd.	[3]	Naepo Green Energy Co., Ltd.	[3]	Naepo Green Energy Co., Ltd.	[3]	Naepo Green Energy Co., Ltd.	[3]
Amount of guarantees							₩ 30,000	[3]
Name of Guarantee	IBK and others	[3]	IBK and others	[3]	IBK and others	[3]	IBK and others	[3]
Collateralized money invested 48
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.
Name of Principal obligor	Omisan Wind Power Co., Ltd.		Omisan Wind Power Co., Ltd.		Omisan Wind Power Co., Ltd.		Omisan Wind Power Co., Ltd.
Amount of guarantees							₩ 10,411
Name of Guarantee	Shinhan Bank and others		Shinhan Bank and others		Shinhan Bank and others		Shinhan Bank and others
Collateralized money invested 49
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.
Name of Principal obligor	Geumsungsan Wind Power Co., Ltd.		Geumsungsan Wind Power Co., Ltd.		Geumsungsan Wind Power Co., Ltd.		Geumsungsan Wind Power Co., Ltd.
Amount of guarantees							₩ 3,493
Name of Guarantee	Kookmin Bank		Kookmin Bank		Kookmin Bank		Kookmin Bank
Collateralized money invested 50
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	KOSPO Chile SpA		KOSPO Chile SpA		KOSPO Chile SpA		KOSPO Chile SpA
Name of Principal obligor	Kelar S.A.		Kelar S.A.		Kelar S.A.		Kelar S.A.
Amount of guarantees							₩ 117,137
Name of Guarantee	Export-Import Bank of Korea and others		Export-Import Bank of Korea and others		Export-Import Bank of Korea and others		Export-Import Bank of Korea and others
Guarantees for supplemental funding 20
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.	[3]	Korea Southern Power Co., Ltd.	[3]	Korea Southern Power Co., Ltd.	[3]	Korea Southern Power Co., Ltd.	[3]
Name of Principal obligor	Geumsungsan Wind Power Co., Ltd.	[3]	Geumsungsan Wind Power Co., Ltd.	[3]	Geumsungsan Wind Power Co., Ltd.	[3]	Geumsungsan Wind Power Co., Ltd.	[3]
Amount of guarantees							₩ 0	[3]
Name of Guarantee	Kookmin Bank	[3]	Kookmin Bank	[3]	Kookmin Bank	[3]	Kookmin Bank	[3]
Collateralized money invested 51
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	KOSPO Chile SpA		KOSPO Chile SpA		KOSPO Chile SpA		KOSPO Chile SpA
Name of Principal obligor	Chester Solar I SpA		Chester Solar I SpA		Chester Solar I SpA		Chester Solar I SpA
Amount of guarantees							₩ 1,314
Name of Guarantee	IBK		IBK		IBK		IBK
Collateralized money invested 52
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	KOSPO Chile SpA		KOSPO Chile SpA		KOSPO Chile SpA		KOSPO Chile SpA
Name of Principal obligor	Chester Solar IV SpA		Chester Solar IV SpA		Chester Solar IV SpA		Chester Solar IV SpA
Amount of guarantees							₩ 181
Name of Guarantee	IBK		IBK		IBK		IBK
Collateralized money invested 53
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	KOSPO Chile SpA		KOSPO Chile SpA		KOSPO Chile SpA		KOSPO Chile SpA
Name of Principal obligor	Chester Solar V SpA		Chester Solar V SpA		Chester Solar V SpA		Chester Solar V SpA
Amount of guarantees							₩ 156
Name of Guarantee	IBK		IBK		IBK		IBK
Collateralized money invested 54
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	KOSPO Chile SpA		KOSPO Chile SpA		KOSPO Chile SpA		KOSPO Chile SpA
Name of Principal obligor	Diego de Almagro Solar SpA		Diego de Almagro Solar SpA		Diego de Almagro Solar SpA		Diego de Almagro Solar SpA
Amount of guarantees							₩ 540
Name of Guarantee	IBK		IBK		IBK		IBK
Collateralized money invested 55
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	KOSPO Chile SpA		KOSPO Chile SpA		KOSPO Chile SpA		KOSPO Chile SpA
Name of Principal obligor	Laurel SpA		Laurel SpA		Laurel SpA		Laurel SpA
Amount of guarantees							₩ 554
Name of Guarantee	IBK		IBK		IBK		IBK
Collateralized money invested 56
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.
Name of Principal obligor	YeongGwang Yaksu Wind Electric Co., Ltd.		YeongGwang Yaksu Wind Electric Co., Ltd.		YeongGwang Yaksu Wind Electric Co., Ltd.		YeongGwang Yaksu Wind Electric Co., Ltd.
Amount of guarantees							₩ 156
Name of Guarantee	IBK and others		IBK and others		IBK and others		IBK and others
Collateralized money invested 57
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd		Korea Midland Power Co., Ltd		Korea Midland Power Co., Ltd		Korea Midland Power Co., Ltd
Name of Principal obligor	Hyundai Green Power Co., Ltd.		Hyundai Green Power Co., Ltd.		Hyundai Green Power Co., Ltd.		Hyundai Green Power Co., Ltd.
Amount of guarantees							₩ 119,791
Name of Guarantee	Korea Development Bank and others		Korea Development Bank and others		Korea Development Bank and others		Korea Development Bank and others
Collateralized money invested 58
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.
Name of Principal obligor	Green Energy Electricity Generation Co., Ltd.		Green Energy Electricity Generation Co., Ltd.		Green Energy Electricity Generation Co., Ltd.		Green Energy Electricity Generation Co., Ltd.
Amount of guarantees							₩ 1,571
Name of Guarantee	IBK		IBK		IBK		IBK
Debt guarantees 3
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.
Name of Principal obligor	PT. Cirebon Electric Power		PT. Cirebon Electric Power		PT. Cirebon Electric Power		PT. Cirebon Electric Power
Amount of guarantees | $	$ 4,785
Name of Guarantee	Mizuho Bank		Mizuho Bank		Mizuho Bank		Mizuho Bank
Debt guarantees 4
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.
Name of Principal obligor	PT Wampu Electric Power		PT Wampu Electric Power		PT Wampu Electric Power		PT Wampu Electric Power
Amount of guarantees | $	$ 4,401
Name of Guarantee	SMBC		SMBC		SMBC		SMBC
Collateralized money invested 59
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.
Name of Principal obligor	Yaksu ESS Co., Ltd.		Yaksu ESS Co., Ltd.		Yaksu ESS Co., Ltd.		Yaksu ESS Co., Ltd.
Amount of guarantees							₩ 486
Name of Guarantee	IBK		IBK		IBK		IBK
Guarantees for supplemental funding and others 1
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd.	[3]	Korea Midland Power Co., Ltd.	[3]	Korea Midland Power Co., Ltd.	[3]	Korea Midland Power Co., Ltd.	[3]
Name of Principal obligor	Green Energy Electricity Generation Co., Ltd.	[3]	Green Energy Electricity Generation Co., Ltd.	[3]	Green Energy Electricity Generation Co., Ltd.	[3]	Green Energy Electricity Generation Co., Ltd.	[3]
Amount of guarantees							₩ 0	[3]
Name of Guarantee	IBK and others	[3]	IBK and others	[3]	IBK and others	[3]	IBK and others	[3]
Collateralized money invested 60
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.
Name of Principal obligor	Namjeongsusang Solar Power Operation Co., Ltd.		Namjeongsusang Solar Power Operation Co., Ltd.		Namjeongsusang Solar Power Operation Co., Ltd.		Namjeongsusang Solar Power Operation Co., Ltd.
Amount of guarantees							₩ 373
Name of Guarantee	IBK		IBK		IBK		IBK
Collateralized money invested 61
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.
Name of Principal obligor	Gwangbaek Solar Power Investment Co., Ltd.		Gwangbaek Solar Power Investment Co., Ltd.		Gwangbaek Solar Power Investment Co., Ltd.		Gwangbaek Solar Power Investment Co., Ltd.
Amount of guarantees							₩ 5,133
Name of Guarantee	Kyobo Life Insurance Co., Ltd. and others		Kyobo Life Insurance Co., Ltd. and others		Kyobo Life Insurance Co., Ltd. and others		Kyobo Life Insurance Co., Ltd. and others
Collateralized money invested 62
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.
Name of Principal obligor	Muan Sunshine Solar Power Plant Co., Ltd.		Muan Sunshine Solar Power Plant Co., Ltd.		Muan Sunshine Solar Power Plant Co., Ltd.		Muan Sunshine Solar Power Plant Co., Ltd.
Amount of guarantees							₩ 2,562
Name of Guarantee	IBK		IBK		IBK		IBK
Collateralized money invested 63
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.
Name of Principal obligor	Goesan Solar park Co., Ltd.		Goesan Solar park Co., Ltd.		Goesan Solar park Co., Ltd.		Goesan Solar park Co., Ltd.
Amount of guarantees							₩ 2,591
Name of Guarantee	IBK		IBK		IBK		IBK
Collateralized money invested 64
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.
Name of Principal obligor	Bitgoel Eco Energy Co., Ltd.		Bitgoel Eco Energy Co., Ltd.		Bitgoel Eco Energy Co., Ltd.		Bitgoel Eco Energy Co., Ltd.
Amount of guarantees							₩ 5,292
Name of Guarantee	IBK and others		IBK and others		IBK and others		IBK and others
Collateralized money invested 65
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.
Name of Principal obligor	Energyco Co., Ltd.		Energyco Co., Ltd.		Energyco Co., Ltd.		Energyco Co., Ltd.
Amount of guarantees							₩ 2,190
Name of Guarantee	Nonghyup Bank		Nonghyup Bank		Nonghyup Bank		Nonghyup Bank
Collateralized money invested 66
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.
Name of Principal obligor	Jeju Gimnyeong Wind Power Co., Ltd.		Jeju Gimnyeong Wind Power Co., Ltd.		Jeju Gimnyeong Wind Power Co., Ltd.		Jeju Gimnyeong Wind Power Co., Ltd.
Amount of guarantees							₩ 872
Name of Guarantee	Nonghyup Bank		Nonghyup Bank		Nonghyup Bank		Nonghyup Bank
Guarantees for supplemental funding 21
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd.	[3]	Korea Midland Power Co., Ltd.	[3]	Korea Midland Power Co., Ltd.	[3]	Korea Midland Power Co., Ltd.	[3]
Name of Principal obligor	Bitgoel Eco Energy Co., Ltd.	[3]	Bitgoel Eco Energy Co., Ltd.	[3]	Bitgoel Eco Energy Co., Ltd.	[3]	Bitgoel Eco Energy Co., Ltd.	[3]
Amount of guarantees							₩ 0	[3]
Name of Guarantee	IBK and others	[3]	IBK and others	[3]	IBK and others	[3]	IBK and others	[3]
Debt guarantees 5
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.
Name of Principal obligor	Energyco Co., Ltd.		Energyco Co., Ltd.		Energyco Co., Ltd.		Energyco Co., Ltd.
Amount of guarantees							₩ 2,746
Name of Guarantee	Shinhan Bank		Shinhan Bank		Shinhan Bank		Shinhan Bank
Collateralized money invested 67
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.
Name of Principal obligor	Dongbu Highway Solar Co., Ltd.		Dongbu Highway Solar Co., Ltd.		Dongbu Highway Solar Co., Ltd.		Dongbu Highway Solar Co., Ltd.
Amount of guarantees							₩ 352
Name of Guarantee	Nonghyup Bank		Nonghyup Bank		Nonghyup Bank		Nonghyup Bank
Collateralized money invested 68
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.
Name of Principal obligor	Seobu Highway Solar Co., Ltd.		Seobu Highway Solar Co., Ltd.		Seobu Highway Solar Co., Ltd.		Seobu Highway Solar Co., Ltd.
Amount of guarantees							₩ 316
Name of Guarantee	Nonghyup Bank		Nonghyup Bank		Nonghyup Bank		Nonghyup Bank
Collateralized money invested 69
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.
Name of Principal obligor	Yeongyang Wind Power Corporation II		Yeongyang Wind Power Corporation II		Yeongyang Wind Power Corporation II		Yeongyang Wind Power Corporation II
Amount of guarantees							₩ 7,461
Name of Guarantee	Korea Development Bank and Samsung Fire & Marine Insurance Co., Ltd		Korea Development Bank and Samsung Fire & Marine Insurance Co., Ltd		Korea Development Bank and Samsung Fire & Marine Insurance Co., Ltd		Korea Development Bank and Samsung Fire & Marine Insurance Co., Ltd
Collateralized money invested 70
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.
Name of Principal obligor	Haeparang Energy Co., Ltd.		Haeparang Energy Co., Ltd.		Haeparang Energy Co., Ltd.		Haeparang Energy Co., Ltd.
Amount of guarantees							₩ 2,188
Name of Guarantee	Templeton hana asset management Co. Ltd		Templeton hana asset management Co. Ltd		Templeton hana asset management Co. Ltd		Templeton hana asset management Co. Ltd
Collateralized money invested 71
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea South-East Power Co., Ltd.	[9]	Korea South-East Power Co., Ltd.	[9]	Korea South-East Power Co., Ltd.	[9]	Korea South-East Power Co., Ltd.	[9]
Name of Principal obligor	Dayone Energy Co., Ltd.	[9]	Dayone Energy Co., Ltd.	[9]	Dayone Energy Co., Ltd.	[9]	Dayone Energy Co., Ltd.	[9]
Amount of guarantees							₩ 0	[9]
Name of Guarantee	IBK	[9]	IBK	[9]	IBK	[9]	IBK	[9]
Guarantees for supplemental funding 22
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.		Korea Midland Power Co., Ltd.
Name of Principal obligor	Haeparang Energy Co., Ltd.		Haeparang Energy Co., Ltd.		Haeparang Energy Co., Ltd.		Haeparang Energy Co., Ltd.
Amount of guarantees							₩ 0
Name of Guarantee	Templeton hana asset management Co. Ltd		Templeton hana asset management Co. Ltd		Templeton hana asset management Co. Ltd		Templeton hana asset management Co. Ltd
Collateralized money invested 73
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.
Name of Principal obligor	RES Technology AD		RES Technology AD		RES Technology AD		RES Technology AD
Amount of guarantees							₩ 15,133
Name of Guarantee	UniCredit Bulbank and others		UniCredit Bulbank and others		UniCredit Bulbank and others		UniCredit Bulbank and others
Guarantees for supplemental funding 23
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Midland Power Co., Ltd.	[3]	Korea Midland Power Co., Ltd.	[3]	Korea Midland Power Co., Ltd.	[3]	Korea Midland Power Co., Ltd.	[3]
Name of Principal obligor	Saemangeum Sebit Power Plant Co., Ltd.	[3]	Saemangeum Sebit Power Plant Co., Ltd.	[3]	Saemangeum Sebit Power Plant Co., Ltd.	[3]	Saemangeum Sebit Power Plant Co., Ltd.	[3]
Amount of guarantees							₩ 0	[3]
Name of Guarantee	Kookmin Bank	[3]	Kookmin Bank	[3]	Kookmin Bank	[3]	Kookmin Bank	[3]
Guarantees for supplemental funding and others 2
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea South-East Power Co., Ltd.	[3],[10]	Korea South-East Power Co., Ltd.	[3],[10]	Korea South-East Power Co., Ltd.	[3],[10]	Korea South-East Power Co., Ltd.	[3],[10]
Name of Principal obligor	Dayone Energy Co., Ltd.	[3],[10]	Dayone Energy Co., Ltd.	[3],[10]	Dayone Energy Co., Ltd.	[3],[10]	Dayone Energy Co., Ltd.	[3],[10]
Amount of guarantees							₩ 76,800	[3],[10]
Name of Guarantee	NH investment & securities Co., Ltd. and others	[3],[10]	NH investment & securities Co., Ltd. and others	[3],[10]	NH investment & securities Co., Ltd. and others	[3],[10]	NH investment & securities Co., Ltd. and others	[3],[10]
Collateralized money invested 74
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.
Name of Principal obligor	ASM-BG Investicii AD		ASM-BG Investicii AD		ASM-BG Investicii AD		ASM-BG Investicii AD
Amount of guarantees							₩ 14,555
Name of Guarantee	UniCredit Bulbank and others		UniCredit Bulbank and others		UniCredit Bulbank and others		UniCredit Bulbank and others
Guarantees for supplemental funding and others 3
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.
Name of Principal obligor	Expressway Solar-light Power Generation Co., Ltd.		Expressway Solar-light Power Generation Co., Ltd.		Expressway Solar-light Power Generation Co., Ltd.		Expressway Solar-light Power Generation Co., Ltd.
Amount of guarantees							₩ 4,754
Name of Guarantee	Woori Bank		Woori Bank		Woori Bank		Woori Bank
Collateralized money invested 75
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.
Name of Principal obligor	Goseong Green Power Co., Ltd.		Goseong Green Power Co., Ltd.		Goseong Green Power Co., Ltd.		Goseong Green Power Co., Ltd.
Amount of guarantees							₩ 288,893
Name of Guarantee	Kyobo Life Insurance Co., Ltd. and others		Kyobo Life Insurance Co., Ltd. and others		Kyobo Life Insurance Co., Ltd. and others		Kyobo Life Insurance Co., Ltd. and others
Collateralized money invested 76
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.
Name of Principal obligor	Gangneung Eco Power Co., Ltd.		Gangneung Eco Power Co., Ltd.		Gangneung Eco Power Co., Ltd.		Gangneung Eco Power Co., Ltd.
Amount of guarantees							₩ 0
Name of Guarantee	Kyobo Life Insurance Co., Ltd. and others		Kyobo Life Insurance Co., Ltd. and others		Kyobo Life Insurance Co., Ltd. and others		Kyobo Life Insurance Co., Ltd. and others
Collateralized money invested 77
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.
Name of Principal obligor	PND Solar Co., Ltd.		PND Solar Co., Ltd.		PND Solar Co., Ltd.		PND Solar Co., Ltd.
Amount of guarantees							₩ 1,403
Name of Guarantee	IBK		IBK		IBK		IBK
Collateralized money invested 78
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.
Name of Principal obligor	Hyundai Eco Energy Co., Ltd.		Hyundai Eco Energy Co., Ltd.		Hyundai Eco Energy Co., Ltd.		Hyundai Eco Energy Co., Ltd.
Amount of guarantees							₩ 7,631
Name of Guarantee	Samsung Life Insurance and others		Samsung Life Insurance and others		Samsung Life Insurance and others		Samsung Life Insurance and others
Collateralized money invested 79
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.
Name of Principal obligor	Jaeun Resident Wind Power Plant Co., Ltd.		Jaeun Resident Wind Power Plant Co., Ltd.		Jaeun Resident Wind Power Plant Co., Ltd.		Jaeun Resident Wind Power Plant Co., Ltd.
Amount of guarantees							₩ 2,236
Name of Guarantee	IBK		IBK		IBK		IBK
Collateralized money invested 80
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.
Name of Principal obligor	Chungsongmeon BongSan wind power Co., Ltd.		Chungsongmeon BongSan wind power Co., Ltd.		Chungsongmeon BongSan wind power Co., Ltd.		Chungsongmeon BongSan wind power Co., Ltd.
Amount of guarantees							₩ 3,470
Name of Guarantee	Kyobo Life Insurance Co., Ltd. and others		Kyobo Life Insurance Co., Ltd. and others		Kyobo Life Insurance Co., Ltd. and others		Kyobo Life Insurance Co., Ltd. and others
Collateralized money invested 81
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.
Name of Principal obligor	Yeongam Solar Power Co., Ltd.		Yeongam Solar Power Co., Ltd.		Yeongam Solar Power Co., Ltd.		Yeongam Solar Power Co., Ltd.
Amount of guarantees							₩ 9,879
Name of Guarantee	Kookmin Bank and others		Kookmin Bank and others		Kookmin Bank and others		Kookmin Bank and others
Collateralized money invested 82
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.
Name of Principal obligor	Samsu Wind Power Co., Ltd.		Samsu Wind Power Co., Ltd.		Samsu Wind Power Co., Ltd.		Samsu Wind Power Co., Ltd.
Amount of guarantees							₩ 3,205
Name of Guarantee	Shinhan Bank and others		Shinhan Bank and others		Shinhan Bank and others		Shinhan Bank and others
Collateralized money invested 83
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.
Name of Principal obligor	Saemangeum Heemang Photovoltaic Co., Ltd.		Saemangeum Heemang Photovoltaic Co., Ltd.		Saemangeum Heemang Photovoltaic Co., Ltd.		Saemangeum Heemang Photovoltaic Co., Ltd.
Amount of guarantees							₩ 13,010
Name of Guarantee	Woori Bank and others		Woori Bank and others		Woori Bank and others		Woori Bank and others
Guarantees for supplemental funding and performance guarantees [Member]
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.	[3]	Korea Southern Power Co., Ltd.	[3]	Korea Southern Power Co., Ltd.	[3]	Korea Southern Power Co., Ltd.	[3]
Name of Principal obligor	Omisan Wind Power Co., Ltd.	[3]	Omisan Wind Power Co., Ltd.	[3]	Omisan Wind Power Co., Ltd.	[3]	Omisan Wind Power Co., Ltd.	[3]
Amount of guarantees							₩ 0	[3]
Name of Guarantee	Shinhan Bank and others	[3]	Shinhan Bank and others	[3]	Shinhan Bank and others	[3]	Shinhan Bank and others	[3]
Collateralized money invested 84
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.
Name of Principal obligor	Nepal Water & Energy Development Company Private Limited		Nepal Water & Energy Development Company Private Limited		Nepal Water & Energy Development Company Private Limited		Nepal Water & Energy Development Company Private Limited
Amount of guarantees | $	$ 97,105
Name of Guarantee	International Finance Corporation and others		International Finance Corporation and others		International Finance Corporation and others		International Finance Corporation and others
Collateralized money invested 85
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Hydro & Nuclear Power Co., Ltd.		Korea Hydro & Nuclear Power Co., Ltd.		Korea Hydro & Nuclear Power Co., Ltd.		Korea Hydro & Nuclear Power Co., Ltd.
Name of Principal obligor	Noeul Green Energy Co., Ltd.		Noeul Green Energy Co., Ltd.		Noeul Green Energy Co., Ltd.		Noeul Green Energy Co., Ltd.
Amount of guarantees							₩ 0
Name of Guarantee	Hana Bank and others		Hana Bank and others		Hana Bank and others		Hana Bank and others
Collateralized money invested 86
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Hydro & Nuclear Power Co., Ltd.		Korea Hydro & Nuclear Power Co., Ltd.		Korea Hydro & Nuclear Power Co., Ltd.		Korea Hydro & Nuclear Power Co., Ltd.
Name of Principal obligor	Busan Green Energy Co., Ltd		Busan Green Energy Co., Ltd		Busan Green Energy Co., Ltd		Busan Green Energy Co., Ltd
Amount of guarantees							₩ 4,396
Name of Guarantee	Shinhan Bank and others		Shinhan Bank and others		Shinhan Bank and others		Shinhan Bank and others
Business Reserve Payment Guarantee [Member]
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.		Korea South-East Power Co., Ltd.
Name of Principal obligor	Nepal Water & Energy Development Company Private Limited		Nepal Water & Energy Development Company Private Limited		Nepal Water & Energy Development Company Private Limited		Nepal Water & Energy Development Company Private Limited
Amount of guarantees | $	$ 33,333
Name of Guarantee	International Finance Corporation and others		International Finance Corporation and others		International Finance Corporation and others		International Finance Corporation and others
Collateralized money invested 87
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Hydro & Nuclear Power Co., Ltd.		Korea Hydro & Nuclear Power Co., Ltd.		Korea Hydro & Nuclear Power Co., Ltd.		Korea Hydro & Nuclear Power Co., Ltd.
Name of Principal obligor	Go deok Clean Energy Co., Ltd.		Go deok Clean Energy Co., Ltd.		Go deok Clean Energy Co., Ltd.		Go deok Clean Energy Co., Ltd.
Amount of guarantees							₩ 4,419
Name of Guarantee	Kookmin Bank and others		Kookmin Bank and others		Kookmin Bank and others		Kookmin Bank and others
Collateralized money invested 88
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Hydro & Nuclear Power Co., Ltd.		Korea Hydro & Nuclear Power Co., Ltd.		Korea Hydro & Nuclear Power Co., Ltd.		Korea Hydro & Nuclear Power Co., Ltd.
Name of Principal obligor	Cheong-Song Noraesan Wind Power Co., Ltd.		Cheong-Song Noraesan Wind Power Co., Ltd.		Cheong-Song Noraesan Wind Power Co., Ltd.		Cheong-Song Noraesan Wind Power Co., Ltd.
Amount of guarantees							₩ 4,264
Name of Guarantee	Woori Bank and others		Woori Bank and others		Woori Bank and others		Woori Bank and others
CollateralizedMoney Invested 89 [Member]
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Hydro & Nuclear Power Co., Ltd.		Korea Hydro & Nuclear Power Co., Ltd.		Korea Hydro & Nuclear Power Co., Ltd.		Korea Hydro & Nuclear Power Co., Ltd.
Name of Principal obligor	Gwangyang Green Energy Co., Ltd.		Gwangyang Green Energy Co., Ltd.		Gwangyang Green Energy Co., Ltd.		Gwangyang Green Energy Co., Ltd.
Amount of guarantees							₩ 25,043
Name of Guarantee	Shinhan Bank and others		Shinhan Bank and others		Shinhan Bank and others		Shinhan Bank and others
Collateralized Money Invested 90 [Member]
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Hydro & Nuclear Power Co., Ltd.		Korea Hydro & Nuclear Power Co., Ltd.		Korea Hydro & Nuclear Power Co., Ltd.		Korea Hydro & Nuclear Power Co., Ltd.
Name of Principal obligor	Gangneung Sacheon Fuel Cell Co., Ltd.		Gangneung Sacheon Fuel Cell Co., Ltd.		Gangneung Sacheon Fuel Cell Co., Ltd.		Gangneung Sacheon Fuel Cell Co., Ltd.
Amount of guarantees							₩ 4,276
Name of Guarantee	Hana Bank and others		Hana Bank and others		Hana Bank and others		Hana Bank and others
Collateralized Money Invested 91 [Member]
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Hydro & Nuclear Power Co., Ltd.		Korea Hydro & Nuclear Power Co., Ltd.		Korea Hydro & Nuclear Power Co., Ltd.		Korea Hydro & Nuclear Power Co., Ltd.
Name of Principal obligor	Chun-cheon Green Energy Co., Ltd.		Chun-cheon Green Energy Co., Ltd.		Chun-cheon Green Energy Co., Ltd.		Chun-cheon Green Energy Co., Ltd.
Amount of guarantees							₩ 9,156
Name of Guarantee	Hana Bank and others		Hana Bank and others		Hana Bank and others		Hana Bank and others
Other performance guarantees 5 [Member]
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation
Name of Principal obligor	Recursos Solares PV de Mexico II, S.A. de C.V.		Recursos Solares PV de Mexico II, S.A. de C.V.		Recursos Solares PV de Mexico II, S.A. de C.V.		Recursos Solares PV de Mexico II, S.A. de C.V.
Amount of guarantees | $	$ 393
Name of Guarantee	CFE Transmission		CFE Transmission		CFE Transmission		CFE Transmission
Other performance guarantees 6 [Member]
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation
Name of Principal obligor	Sunmex Renovables, S.A. de C.V.		Sunmex Renovables, S.A. de C.V.		Sunmex Renovables, S.A. de C.V.		Sunmex Renovables, S.A. de C.V.
Amount of guarantees | $					$ 3,666
Name of Guarantee	SEMARNAT		SEMARNAT		SEMARNAT		SEMARNAT
Other Performance Guarantees 7 [Member]
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation		Korea Electric Power Corporation
Name of Principal obligor	Sunmex Renovables, S.A. de C.V.		Sunmex Renovables, S.A. de C.V.		Sunmex Renovables, S.A. de C.V.		Sunmex Renovables, S.A. de C.V.
Amount of guarantees | $	$ 9,078
Name of Guarantee	CENACE		CENACE		CENACE		CENACE
[1]The credit limits of guarantees to RE Holiday Holdings LLC and RE Barren Ridge 1 Holdings LLC include the credit limits of guarantees to their subsidiaries.[2]The Company has provided the syndicate of lenders of PT Indo Raya Tenaga, the business corporation of PT Barito Wahana Tenaga, a guarantee by establishing the right of pledge on the shares of PT Barito Wahana Tenaga for project financing of PT Barito Wahana Tenaga as of December 31, 2022.[3]The Company guarantees to provide supplemental funding for business with respect to excessive business expenses or insufficient repayment of borrowings.[4]The common stocks of Dongducheon Dream Power Co., Ltd. held by the Company were pledged as collateral.[5]This includes a guarantee related to L/C for debt repayment allowance provided to DE Energia SpA, a joint venture of the Company.[6]The Company provided a payment guarantee to Daehan Wind Power PSC for opening L/C for Debt Service Reserve Account (DSRA).[7]Controlling and non-controlling common shareholders of Samcheok Eco Materials Co., Ltd. have pre-emption rights, if preferred shareholders intend to sell their shares until December 26, 2023. The promised yield of the preferred stock is guaranteed through the transaction. As of December 31, 2022, the Company has recognized derivative liabilities of ￦6,760 million related to the guarantee. Meanwhile, the Company is under an agreement with Samcheok Eco Materials Co., Ltd. that if a damage incurs related to the fulfillment of obligations pursuant to the mandatory contract of coal ash supply, compensation for the expected amount of the damage should be settled.[8]The Company recognized an impairment loss on all of the equity securities of Naepo Green Energy Co., Ltd. before the prior year, and the acquisition cost of the securities provided as collateral is ￦29,200 million.[9]The Company recognized an impairment loss on all of the equity securities of Dayone Energy Co., Ltd. before the prior year, and the acquisition cost of the securities provided as collateral is ￦47,067 million.[10]Pursuant to the guarantee agreement, the Company recognized other provisions of ￦7,230 million as the possibility of economic benefit outflow to fulfill the obligation was deemed probable and the amount could be reasonably estimated.

Related Parties - Summary of _3

Related Parties - Summary of Guarantees Provided To Related Parties (Parentheticals) (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disclosure of Guarantees provided between the related parties [Line Items]
Borrowings notional amount	₩ 6,615,470	₩ 3,742,184
Saemangeum Heemang Photovoltaic Co., Ltd [Member] | Kookmin Bank [Member]
Disclosure of Guarantees provided between the related parties [Line Items]
Provision of guarantees or collateral by entity	63,400
Borrowings notional amount	99,900
Other borrowings	36,500
Saemangeum Heemang Photovoltaic Co., Ltd [Member] | Kookmin Bank [Member] | Shares [Member]
Disclosure of Guarantees provided between the related parties [Line Items]
Financial assets pledged as collateral for liabilities or contingent liabilites	36,500
Derivative liabilities [Member]
Disclosure of Guarantees provided between the related parties [Line Items]
Provision of guarantees or collateral by entity	6,760
Acquisition cost of the securities [Member]
Disclosure of Guarantees provided between the related parties [Line Items]
Provision of guarantees or collateral by entity	47,067
Other provisions [member]
Disclosure of Guarantees provided between the related parties [Line Items]
Provision of guarantees or collateral by entity	7,230
Impairment loss [Member] | Naepo Green Energy Co., Ltd [Member]
Disclosure of Guarantees provided between the related parties [Line Items]
Provision of guarantees or collateral by entity	₩ 29,200

Related Parties - Summary of _4

Related Parties - Summary of Guarantees Received from Related Parties (Detail) - Kapes Inc [Member] ₩ in Millions	12 Months Ended
	Dec. 31, 2022 KRW (₩)
Performance Guarantees [Member]
Disclosure In Tabular Form Of Guarantees Provided To Related Parties [Line Items]
Credit limit	₩ 17,225
Defect Guarantees [Member]
Disclosure In Tabular Form Of Guarantees Provided To Related Parties [Line Items]
Credit limit	₩ 2,533

Related Parties - Summary of De

Related Parties - Summary of Derivatives Transactions With Related Parties (Details) - 12 months ended Dec. 31, 2022 - Korea Development Bank SFr in Thousands, $ in Thousands, $ in Thousands, ₩ in Millions	KRW (₩)	USD ($)	HKD ($)	CHF (SFr)
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2019~2024	2019~2024	2019~2024	2019~2024
Pay, Contract Amount	₩ 177,600
Receive, Contract Amount | $		$ 150,000
Contract Interest rate Pay	1.24	1.24	1.24	1.24
Contract Interest rate Receive	2.50	2.50	2.50	2.50
Contract exchange rate	1,184	1,184	1,184	1,184
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2020~2025	2020~2025	2020~2025	2020~2025
Pay, Contract Amount	₩ 241,320
Receive, Contract Amount | $		$ 200,000
Contract Interest rate Pay	0.54	0.54	0.54	0.54
Contract Interest rate Receive	1.13	1.13	1.13	1.13
Contract exchange rate	1,206.6	1,206.6	1,206.6	1,206.6
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2021~2026	2021~2026	2021~2026	2021~2026
Pay, Contract Amount	₩ 118,170
Receive, Contract Amount | $		$ 100,000
Contract Interest rate Pay	1.11	1.11	1.11	1.11
Contract Interest rate Receive	1.13	1.13	1.13	1.13
Contract exchange rate	1,181.7	1,181.7	1,181.7	1,181.7
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2015~2025	2015~2025	2015~2025	2015~2025
Pay, Contract Amount	₩ 111,190
Receive, Contract Amount | $		$ 100,000
Contract Interest rate Pay	2.62	2.62	2.62	2.62
Contract Interest rate Receive	3.25	3.25	3.25	3.25
Contract exchange rate	1,111.9	1,111.9	1,111.9	1,111.9
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2017~2027	2017~2027	2017~2027	2017~2027
Pay, Contract Amount	₩ 111,610
Receive, Contract Amount | $		$ 100,000
Contract Interest rate Pay	2.31	2.31	2.31	2.31
Contract Interest rate Receive	3.13	3.13	3.13	3.13
Contract exchange rate	1,116.1	1,116.1	1,116.1	1,116.1
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2018~2028	2018~2028	2018~2028	2018~2028
Pay, Contract Amount	₩ 108,600
Receive, Contract Amount | $			$ 800,000
Contract Interest rate Pay	2.69	2.69	2.69	2.69
Contract Interest rate Receive	3.35	3.35	3.35	3.35
Contract exchange rate	135.75	135.75	135.75	135.75
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2018~2023	2018~2023	2018~2023	2018~2023
Pay, Contract Amount	₩ 170,280
Receive, Contract Amount | $		$ 150,000
Contract Interest rate Pay	2.15	2.15	2.15	2.15
Contract Interest rate Receive	3.75	3.75	3.75	3.75
Contract exchange rate	1,135.2	1,135.2	1,135.2	1,135.2
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2019~2027	2019~2027	2019~2027	2019~2027
Pay, Contract Amount	₩ 119,978
Receive, Contract Amount | SFr				SFr 100,000
Contract Interest rate Pay	1.43	1.43	1.43	1.43
Contract Interest rate Receive	0.05	0.05	0.05	0.05
Contract exchange rate	1,199.78	1,199.78	1,199.78	1,199.78
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2021~2026	2021~2026	2021~2026	2021~2026
Pay, Contract Amount	₩ 111,400
Receive, Contract Amount | $		$ 100,000
Contract Interest rate Pay	0.93	0.93	0.93	0.93
Contract Interest rate Receive	1.25	1.25	1.25	1.25
Contract exchange rate	1,114	1,114	1,114	1,114
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2022~2027	2022~2027	2022~2027	2022~2027
Pay, Contract Amount	₩ 262,000
Receive, Contract Amount | $		$ 200,000
Contract Interest rate Pay	3.63	3.63	3.63	3.63
Contract Interest rate Receive	4.25	4.25	4.25	4.25
Contract exchange rate	1,310	1,310	1,310	1,310
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2020~2026	2020~2026	2020~2026	2020~2026
Pay, Contract Amount	₩ 118,910
Receive, Contract Amount | $		$ 100,000
Contract Interest rate Pay	0.61	0.61	0.61	0.61
Contract Interest rate Receive	1.00	1.00	1.00	1.00
Contract exchange rate	1,189.1	1,189.1	1,189.1	1,189.1
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2021~2026	2021~2026	2021~2026	2021~2026
Pay, Contract Amount	₩ 114,230
Receive, Contract Amount | $		$ 100,000
Contract Interest rate Pay	1.27	1.27	1.27	1.27
Contract Interest rate Receive	1.25	1.25	1.25	1.25
Contract exchange rate	1,142.3	1,142.3	1,142.3	1,142.3
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2022~2027	2022~2027	2022~2027	2022~2027
Pay, Contract Amount	₩ 123,710
Receive, Contract Amount | $		$ 100,000
Contract Interest rate Pay	3.41	3.41	3.41	3.41
Contract Interest rate Receive	3.63	3.63	3.63	3.63
Contract exchange rate	1,237.1	1,237.1	1,237.1	1,237.1
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2018~2023	2018~2023	2018~2023	2018~2023
Pay, Contract Amount	₩ 320,880
Receive, Contract Amount | $		$ 300,000
Contract Interest rate Pay	2.03	2.03	2.03	2.03
Contract Interest rate Receive	3.75	3.75	3.75	3.75
Contract exchange rate	1,069.6	1,069.6	1,069.6	1,069.6
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2022~2025	2022~2025	2022~2025	2022~2025
Pay, Contract Amount	₩ 128,560
Receive, Contract Amount | $		$ 100,000
Contract Interest rate Pay	3.37	3.37	3.37	3.37
Contract Interest rate Receive	4.13	4.13	4.13	4.13
Contract exchange rate	1,285.6	1,285.6	1,285.6	1,285.6
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2018~2023	2018~2023	2018~2023	2018~2023
Pay, Contract Amount	₩ 169,335
Receive, Contract Amount | $		$ 150,000
Contract Interest rate Pay	2.26	2.26	2.26	2.26
Contract Interest rate Receive	3.88	3.88	3.88	3.88
Contract exchange rate	1,128.9	1,128.9	1,128.9	1,128.9
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2020~2025	2020~2025	2020~2025	2020~2025
Pay, Contract Amount	₩ 122,780
Receive, Contract Amount | $		$ 100,000
Contract Interest rate Pay	0.93	0.93	0.93	0.93
Contract Interest rate Receive	1.75	1.75	1.75	1.75
Contract exchange rate	1,227.8	1,227.8	1,227.8	1,227.8
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2022~2025	2022~2025	2022~2025	2022~2025
Pay, Contract Amount	₩ 252,360
Receive, Contract Amount | $		$ 200,000
Contract Interest rate Pay	2.83	2.83	2.83	2.83
Contract Interest rate Receive	3.60	3.60	3.60	3.60
Contract exchange rate	1,261.8	1,261.8	1,261.8	1,261.8
Cross Currency Forward Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Pay, Contract Amount	₩ 26,010
Receive, Contract Amount | $		$ 20,000
Contract exchange rate	1,300.5	1,300.5	1,300.5	1,300.5
Contract date	Dec. 19, 2022	Dec. 19, 2022	Dec. 19, 2022	Dec. 19, 2022
Matrurity date	Jan. 26, 2023	Jan. 26, 2023	Jan. 26, 2023	Jan. 26, 2023

Related Parties - Summary of Sa

Related Parties - Summary of Salaries and Other Compensations To The Key Members of Management of The Company (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of Key management personnel compensation [Abstract]
Salaries	₩ 1,026	₩ 1,272	₩ 1,295
Retirement benefits	58	21	58
Total	₩ 1,084	₩ 1,293	₩ 1,353

Statement of Cash Flows - Summa

Statement of Cash Flows - Summary of Significant Non-cash Activities (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Transfer from construction-in-progress to other assets
Non Cash Transactions [Line Items]
Non-cash transactions	₩ 13,723,972	₩ 12,902,589	₩ 10,189,527
Recognition of asset retirement cost and related provision for decommissioning costs
Non Cash Transactions [Line Items]
Non-cash transactions	3,497,866	2,356,805	895,507
Transfer from provision for disposal of spent nuclear fuel to accrued expenses
Non Cash Transactions [Line Items]
Non-cash transactions	417,687	455,401	395,921
Transfer from long-term borrowings and debt securities to current portion of long-term borrowings and debt securities
Non Cash Transactions [Line Items]
Non-cash transactions	13,838,578	11,109,271	9,237,883
Transfer from inventory to stored nuclear fuel
Non Cash Transactions [Line Items]
Non-cash transactions	738,720	908,842	1,055,974
Transfer of right-of-use assets due to change in accounting policy and others
Non Cash Transactions [Line Items]
Non-cash transactions	₩ 197,016	₩ 78,213	₩ 291,334

Statement of Cash Flows - Sum_2

Statement of Cash Flows - Summary of Changes in Liabilities Incurred From Financing Activities (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance	₩ 84,940,016	₩ 74,345,677
Cash flows	38,631,168	9,081,358
Increase	109,019	73,090
Effect of exchange rate fluctuations and others	1,088,305	1,439,891
Ending balance	124,768,508	84,940,016
Borrowings and debt securities
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance	80,529,513	69,724,581
Cash flows	39,193,815	9,653,394
Increase	0	0
Effect of exchange rate fluctuations and others	882,037	1,151,538
Ending balance	120,605,365	80,529,513
Lease liabilities
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance	4,410,503	4,621,096
Cash flows	(562,647)	(572,036)
Increase	109,019	73,090
Effect of exchange rate fluctuations and others	206,268	288,353
Ending balance	₩ 4,163,143	₩ 4,410,503

Commitments for Expenditure - S

Commitments for Expenditure - Summary of Commitments For Acquisition of Property, Plant and Equipment (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2022	Dec. 31, 2021
Purchase of cable (PVC, 1C, 2000SQ) 153,000M and others (Shin-Bupyung-Youngseo)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	₩ 57,203	₩ 57,046
Commitments for expenditure remaining liability balances	12,595	16,240
Purchase of cable (PVC, 1C, 2500SQ) 103,374M and others (Bukdangjin-Shin-Tangjung)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	50,151	46,616
Commitments for expenditure remaining liability balances	37,638	34,102
Purchase of GIS (362kV, 6300A, 63kA) 23CB – Youngseo S/S
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	37,168	36,143
Commitments for expenditure remaining liability balances	16,788	25,292
Purchase of GIS (362kV, 6300A, 63kA) 26CB – Hwasung S/S
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	0	40,010
Commitments for expenditure remaining liability balances	0	5,540
Purchase of GIS (362kV, 6300A, 63kA) 27CB – Kwangyang S/S
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	37,744	37,744
Commitments for expenditure remaining liability balances	140	140
Purchase of cable (PVC, 1C, 2500SQ) 100,548M and others
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	58,269	56,860
Commitments for expenditure remaining liability balances	3,883	34,576
Purchase of GIS (362kV, 6300A, 63kA) 25CB – Migeum S/S
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	33,841	32,000
Commitments for expenditure remaining liability balances	25,641	26,700
Advanced E-Type low-pressure electronic power meter 1,320,000 ea
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	0	65,972
Commitments for expenditure remaining liability balances	0	23,262
Purchase of cable (PVC, 1C, 2000SQ) 5,862M and others (Baekun-Gwangyanghang)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	35,949	34,423
Commitments for expenditure remaining liability balances	3,232	23,297
Purchase of cable (TR CNCE-W,1C,325SQ) 1,016,000M
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	0	66,581
Commitments for expenditure remaining liability balances	0	40,254
Purchase of cable (TR CNCE-W,1C,600SQ) 485,000M
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	0	46,194
Commitments for expenditure remaining liability balances	0	37,810
Purchase of cable (TR CNCE-W/AL,1C,400SQ) 3,303,900M
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	0	87,382
Commitments for expenditure remaining liability balances	0	83,628
Concrete pole (10M, general purpose, 350KGF) 126,948 ea and five other equipments
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	202,795	188,338
Commitments for expenditure remaining liability balances	95,428	168,456
Purchase of GIS (362KV, 6300A, 63KA) 19 – Shinyangsan S/S
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	31,834	31,464
Commitments for expenditure remaining liability balances	17,334	31,464
Purchase Of Cable (Pvc, 1c, 2500sq) 57,868m And Others (Goduk-Seoansung)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	40,937	0
Commitments for expenditure remaining liability balances	3,748	0
Purchase of cable (PVC, 1C, 2000SQ) 87,732M and others (Eulwangboonki)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	36,155	0
Commitments for expenditure remaining liability balances	10,274	0
GIS(362KV,6300A,63KA) 18 – Wolsung S/Y
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	32,090	0
Commitments for expenditure remaining liability balances	32,090	0
Purchase of cable (FR CNCO-W,1C,325SQ) 672,300M
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	31,387	0
Commitments for expenditure remaining liability balances	19,213	0
Purchase of cable (TR CNCE-W,1C,325SQ) 1,342,000M
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	75,620	0
Commitments for expenditure remaining liability balances	40,497	0
Purchase of cable (TR CNCE-W,1C,600SQ) 377,000M
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	31,851	0
Commitments for expenditure remaining liability balances	17,478	0
Purchase of cable (TR CNCE-W/AL,1C,400SQ) 2,175,300M
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	53,064	0
Commitments for expenditure remaining liability balances	29,436	0
System stabilization ESS equipment (Bubuk S/S) 1 Type
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	222,300	0
Commitments for expenditure remaining liability balances	222,300	0
System stabilization ESS equipment (Shinnamwon S/S) Type 1
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	211,500	0
Commitments for expenditure remaining liability balances	211,500	0
System stabilization ESS equipment (Yeongcheon S/S) Type 1
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	73,104	0
Commitments for expenditure remaining liability balances	73,104	0
Construction of Saeul Units (#3,4)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	9,800,424	9,800,424
Commitments for expenditure remaining liability balances	2,455,673	3,479,667
Construction of Shin-Hanul Units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	10,327,372	9,745,123
Commitments for expenditure remaining liability balances	97,889	0
Other 36 contracts
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	853,941	792,485
Commitments for expenditure remaining liability balances	425,149	620,593
Service of designing Seoul Combined Units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	31,148	31,841
Commitments for expenditure remaining liability balances	0	934
Purchase of furnace for construction of Shin-Seocheon Thermal Power Plant
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	305,209	305,209
Commitments for expenditure remaining liability balances	5,132	7,722
Purchase of turbine generator for construction of Shin-Seocheon Thermal Power Plant
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	107,333	105,226
Commitments for expenditure remaining liability balances	6,214	6,301
Purchase of main machine for Jeju LNG Combined
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	166,287	166,287
Commitments for expenditure remaining liability balances	10,898	10,972
Purchase of equipments for the construction project of Boryeong indoor coal storage yard
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	318,197	317,350
Commitments for expenditure remaining liability balances	287,965	317,350
Service of designing Taean Units (#9,10)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	112,909	112,909
Commitments for expenditure remaining liability balances	12,468	12,623
Purchase of gas turbine and turbine equipment of Gimpo combined heat & power plant
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	126,302	126,302
Commitments for expenditure remaining liability balances	32,748	61,735
Purchase of steam turbine, hrsg and power block of gimpo combined heat & power plant
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	221,997	214,053
Commitments for expenditure remaining liability balances	38,714	138,244
Construction of Gimpo Combined Heat & Power Plant
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	181,798	130,015
Commitments for expenditure remaining liability balances	56,558	86,323
Purchase of gas turbines, steam turbines, and accessories for Gumi natural gas power plant
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	197,983	0
Commitments for expenditure remaining liability balances	197,983	0
Construction of Gumi natural gas power plant
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	204,094	0
Commitments for expenditure remaining liability balances	204,094	0
Installation of natural gas supply facility at Gumi natural gas power plant
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	70,620	0
Commitments for expenditure remaining liability balances	70,620	0
Purchase of coal handling machine for construction of Samcheok Units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	299,048	286,571
Commitments for expenditure remaining liability balances	6,687	6,215
Purchase of main equipment for Namjeju
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	140,144	140,144
Commitments for expenditure remaining liability balances	3	3
Purchase of main equipment for Shin-Sejong Combined Thermal Power Plant
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	234,392	234,392
Commitments for expenditure remaining liability balances	32,472	200,122
Purchase of Hadong thermal power indoor carboniferous plant
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	162,814	148,800
Commitments for expenditure remaining liability balances	105,504	129,042
Purchase of phase 1 power generation facility for Yeongwol fuel cells
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	0	88,449
Commitments for expenditure remaining liability balances	0	1,523
Purchase of phase 2 power generation facility for Yeongwol fuel cells
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	86,100	0
Commitments for expenditure remaining liability balances	30,527	0
Purchase of fuel cell power generation facilities for the fifth stage of Shinincheon headquarters
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	81,960	0
Commitments for expenditure remaining liability balances	₩ 81,960	₩ 0

Commitments for Expenditure -_2

Commitments for Expenditure - Summary of Commitments For Inventory Purchase (Details)	12 Months Ended
	Dec. 31, 2022
Concentrate
Disclosure of contracts for inventory purchase commitment [Line Items]
Periods	2022 ~ 2033
Contracted amounts	26,310 Ton U3O8
Transformed
Disclosure of contracts for inventory purchase commitment [Line Items]
Periods	2022 ~ 2030
Contracted amounts	19,012 Ton U
Enrichment
Disclosure of contracts for inventory purchase commitment [Line Items]
Periods	2022 ~ 2032
Contracted amounts	21,434 Ton SWU

Commitments for Expenditure - A

Commitments for Expenditure - Additional Information (Details)	12 Months Ended
	Dec. 31, 2022 t
Disclosure of Commitments for Expenditure [Line Items]
Contracted quantity of uranium	1,418

Contingencies and Commitments -

Contingencies and Commitments - Summary of Ongoing Litigations Related With Contingent Liabilities And Contingent Assets (Details) ₩ in Millions	Dec. 31, 2022 KRW (₩)	Dec. 31, 2021 KRW (₩)
As the defendant
Litigation Case [Line Items]
Number of cases	653	683
Claim amount	₩ 981,878	₩ 689,415
As the plaintiff
Litigation Case [Line Items]
Number of cases	238	284
Claim amount	₩ 599,809	₩ 784,453

Contingencies and Commitments_2

Contingencies and Commitments - Summary of Credit Lines Provided By Financial Institutions (Details) - 12 months ended Dec. 31, 2022 ₱ in Thousands, € in Thousands, ₨ in Thousands, ر.س in Thousands, د.إ in Thousands, ¥ in Thousands, $ in Thousands, $ in Thousands, ₩ in Millions	KRW (₩)	PHP (₱)	USD ($)	EUR (€)	JPY (¥)	INR (₨)	SAR (ر.س)	MXN ($)	AED (د.إ)
Commitments on Bank-overdraft
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Nonghyup Bank and others
Credit limit | ₩	₩ 1,910,500
Used amount | ₩	₩ 53,416
Limit amount available for CP
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank and others
Credit limit | ₩	₩ 3,250,000
Used amount | ₩	₩ 3,250,000
General loan, etc.
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank and others
Credit limit | ₩	₩ 3,000,000
Used amount | ₩	₩ 3,000,000
Limit amount available for card
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank and others
Credit limit | ₩	₩ 47,424
Used amount | ₩	₩ 2,615
Limit amount available for card
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Banco de Oro
Credit limit | ₱		₱ 5,000
Used amount | ₱		₱ 3,000
Loan limit
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Korea Development Bank and others
Credit limit | ₩	₩ 2,023,728
Used amount | ₩	₩ 1,369,694
Loan limit
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	DBS Bank Ltd and others
Credit limit			$ 1,385,000
Used amount			143,841
Certification of payment on payables from foreign country
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Nonghyup Bank
Credit limit			12,028
Used amount			8,040
Certification of payment on L/C
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Credit Agricole and others
Credit limit			1,317,245
Used amount			402,677
Certification of payment on L/C
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Kookmin Bank and others
Credit limit | €				€ 48,122
Used amount | €				31,472
Certification of payment on L/C
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Shinhan Bank
Credit limit | ¥					¥ 481,785
Used amount | ¥					0
Certification of performance guarantee on contracts
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank and others
Credit limit | ₩	₩ 127,606
Used amount | ₩	₩ 106,020
Certification of performance guarantee on contracts
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	First Abu Dhabi Bank and others
Credit limit			1,092,590
Used amount			788,404
Certification of performance guarantee on contracts
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Korea Development Bank and others
Credit limit | ¥					620,000
Used amount | ¥					¥ 620,000
Certification of performance guarantee on contracts
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank and others
Credit limit | €				3,965
Used amount | €				3,965
Certification of performance guarantee on contracts
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Shinhan Bank
Credit limit | ₨						₨ 44,872
Used amount | ₨						0
Certification of performance guarantee on contracts
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank
Credit limit | ر.س							ر.س 1,509
Used amount | ر.س							1,509
Certification of bidding
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank
Credit limit			5,200
Used amount			0
Advance payment bond, Warranty bond, Retention bond and others
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Export-Import Bank of Korea
Credit limit | €				10,000
Used amount | €				€ 10,000
Advance payment bond, Warranty bond, Retention bond and others
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Export-Import Bank of Korea
Credit limit | ₩	₩ 106,776
Used amount | ₩	₩ 75,900
Advance payment bond, Warranty bond, Retention bond and others
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank and others
Credit limit			306,251
Used amount			282,224
Advance payment bond, Warranty bond, Retention bond and others
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank and others
Credit limit								$ 21,597
Used amount								$ 20,027
Other commitments
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Nonghyup Bank and others
Credit limit | ₩	₩ 1,216,250
Used amount | ₩	₩ 300,936
Other commitments
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Export-Import Bank of Korea and others
Credit limit			733,318
Used amount			510,094
Other commitments
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Standard Chartered
Credit limit | د.إ									د.إ 50
Used amount | د.إ									د.إ 50
Other commitments
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Shinhan Bank
Credit limit | ر.س							3,000
Used amount | ر.س							ر.س 3,000
Inclusive credit
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank
Credit limit | ₩	₩ 8,000
Used amount | ₩	₩ 667
Equity Bridge Loan Guarantee
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Kookmin Bank
Credit limit			135,000
Used amount			45,909
Equity Bridge Loan Guarantee
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank
Credit limit | ₨						0
Used amount | ₨						₨ 323,837
Equity Bridge Loan Guarantee
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Mizuho Bank and others
Credit limit			1,685,955
Used amount			1,141,788
Trade finance
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Export-Import Bank of Korea and others
Credit limit			970,000
Used amount			$ 0

Contingencies and Commitments_3

Contingencies and Commitments - Summary of Blank Check And Assets Provided As Collaterals Or Pledges To Financial Institutions By The Company Explanatory (Details) - 12 months ended Dec. 31, 2022 JD in Thousands, $ in Thousands, ₩ in Millions		KRW (₩)	USD ($)	JOD (JD)
Property, plant and equipment and others
Disclsoure of assets pledged as collateral [Line Items]
Name of Guarantor		Mira Power Limited
Name of Guarantee		International Finance Corporation and others
Value of collateral | $			$ 275,600
Description of assets pledged as collateral description	[1]	Collateral for borrowings
Property, plant and equipment and others
Disclsoure of assets pledged as collateral [Line Items]
Name of Guarantor		Tamra Offshore Wind Power Co., Ltd.
Name of Guarantee		Kyobo Life Insurance Co., Ltd. and others
Value of collateral		₩ 171,600
Description of assets pledged as collateral description	[2]	Collateral for borrowings
Property, plant and equipment and others
Disclsoure of assets pledged as collateral [Line Items]
Name of Guarantor		Commerce and Industry Energy Co., Ltd.
Name of Guarantee		IBK and others
Value of collateral		₩ 110,500
Description of assets pledged as collateral description	[2]	Collateral for borrowings
Property, plant and equipment and others
Disclsoure of assets pledged as collateral [Line Items]
Name of Guarantor		Gyeongju Wind Power Co., Ltd.
Name of Guarantee		Shinhan Bank and others
Value of collateral		₩ 68,400
Description of assets pledged as collateral description	[2]	Collateral for borrowings
Property, plant and equipment and others
Disclsoure of assets pledged as collateral [Line Items]
Name of Guarantor		Korea Offshore Wind Power Co., Ltd.
Name of Guarantee		Woori Bank and others
Value of collateral		₩ 293,400
Description of assets pledged as collateral description	[2]	Collateral for borrowings
Property, plant and equipment and others
Disclsoure of assets pledged as collateral [Line Items]
Name of Guarantor		K-Solar Shinan Co., Ltd. (formerly, TS Energy No. 25 Co., Ltd.)
Name of Guarantee		Kyobo Life Insurance Co., Ltd. and others
Value of collateral		₩ 329,736
Description of assets pledged as collateral description	[2]	Collateral for borrowings
Cash and cash equivalents
Disclsoure of assets pledged as collateral [Line Items]
Name of Guarantor		Gyeonggi Green Energy Co., Ltd.
Name of Guarantee		Korea Development Bank and others
Value of collateral		₩ 327,080
Description of assets pledged as collateral description	[2]	Collateral for borrowings
Cash and cash equivalents
Disclsoure of assets pledged as collateral [Line Items]
Name of Guarantor		KOSPO Youngnam Power Co., Ltd.
Name of Guarantee		Shinhan Bank and others
Value of collateral		₩ 744,120
Description of assets pledged as collateral description	[2]	Collateral for borrowings
Cash and cash equivalents
Disclsoure of assets pledged as collateral [Line Items]
Name of Guarantor		Incheon Fuel Cell Co., Ltd.
Name of Guarantee		Kookmin Bank and others
Value of collateral		₩ 276,960
Description of assets pledged as collateral description	[2]	Collateral for borrowings
Cash and cash equivalents
Disclsoure of assets pledged as collateral [Line Items]
Name of Guarantor		Jeongam Wind Power Co., Ltd.
Name of Guarantee		KDB Capital Corporation and others
Value of collateral		₩ 235,809
Description of assets pledged as collateral description	[2]	Collateral for borrowings
Finance Lease receivable and property, plant and equipment and others
Disclsoure of assets pledged as collateral [Line Items]
Name of Guarantor		Qatrana Electric Power Company
Name of Guarantee		The Islamic Development Bank and others
Value of collateral | JD				JD 136,623
Description of assets pledged as collateral description	[1]	Collateral for borrowings
Finance Lease receivable and property, plant and equipment and others
Disclsoure of assets pledged as collateral [Line Items]
Name of Guarantor		KST Electric Power Company, S.A.P.I. de C.V.
Name of Guarantee		The Export—Import Bank of Korea and others
Value of collateral | $			$ 401,277
Description of assets pledged as collateral description	[1]	Collateral for debt securities
[1]This is based on the amount of loan commitment limit.[2]As of December 31, 2022, the Company has established guarantees for pledge for transfer of rights of long-term borrowings, pledge for insurance claims, pledge for shares, etc.

Contingencies and Commitments_4

Contingencies and Commitments - Additional Information (Details) € in Thousands, Rp in Thousands, $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2022 KRW (₩)	Dec. 31, 2022 USD ($)	Dec. 31, 2022 EUR (€)	Dec. 31, 2022 USD ($)	Dec. 31, 2022 IDR (Rp)	Dec. 31, 2022 EUR (€)	Dec. 31, 2021 KRW (₩)
Detailed Information About Commitments [Line Items]
Borrowings | ₩	₩ 120,605,365						₩ 80,529,513
January 1 2024 (Member)
Detailed Information About Commitments [Line Items]
Threshold revenue beyond which global minimum tax is applicable | €			€ 750,000
Axia Power Holdings B.V [Member]
Detailed Information About Commitments [Line Items]
Maximum Performance Guarantee Amount				$ 54,000
PT Perusahaan Listrik Negara [Member]
Detailed Information About Commitments [Line Items]
Maximum Performance Guarantee Amount | Rp					Rp 35,588,165
Morgan Stanley Capital Group Inc [Member]
Detailed Information About Commitments [Line Items]
Maximum Performance Guarantee Amount				50,000
Morgan Stanley Renewables Inc [Member]
Detailed Information About Commitments [Line Items]
Maximum Performance Guarantee Amount				70,000
Frankfurt Branch Through Kookmin Bank [Member]
Detailed Information About Commitments [Line Items]
Maximum Performance Guarantee Amount | €						€ 10,000
Microsoft Through Kookmin Bank [Member]
Detailed Information About Commitments [Line Items]
Maximum Performance Guarantee Amount | €						5,022
Ellevio Through Shinhan Bank [Member]
Detailed Information About Commitments [Line Items]
Maximum Performance Guarantee Amount | €						€ 9,980
Shinhan Bank [Member] | Concho Valley Energy, LLC [Member]
Detailed Information About Commitments [Line Items]
Provision for loss contingencies		$ 60,000
Other Borrowings Guarantee Amount				60,000
PT. Cirebon Electro Power [Member]
Detailed Information About Commitments [Line Items]
Maximum Performance Guarantee Amount				54,000
Export Import Bank Of Korea ,BNP Paribas And ING Bank [Member] | PT BS Energy And PT Nusantara Hydro Alam [Member]
Detailed Information About Commitments [Line Items]
Guarantee for investments				5,947
KOMIPO Vanphong Power Service LLC [Member]
Detailed Information About Commitments [Line Items]
Maximum Performance Guarantee Amount				5,000
Gaesong Industrial Complex [Member]
Detailed Information About Commitments [Line Items]
Book value of facility | ₩	12,967
Gangneung [Member]
Detailed Information About Commitments [Line Items]
Suspended operations of plant carrying amount | ₩	66,879
Expenses related to suspension of operations | ₩	1,683
Depreaciation on idle assets | ₩	3,635
AEP Texas Inc [Member]
Detailed Information About Commitments [Line Items]
Business performance guarantees				18,500
Korea Energy Agency [Member]
Detailed Information About Commitments [Line Items]
Borrowings | ₩	1,197
Mizuho Bank [Member] | PT. Cirebon Electro Power [Member] | Nongyup Bank [Member]
Detailed Information About Commitments [Line Items]
Payment guarantee				47,850
SMBC [Member] | Pt Mega Power Mandiri [Member] | PT Wampu Electric Power [Member]
Detailed Information About Commitments [Line Items]
Guarantee for investments				4,401
RBC Community Investments Impact Renewables Hold Co One LLC [Member] | Concho Valley Energy, LLC [Member]
Detailed Information About Commitments [Line Items]
Maximum Performance Guarantee Amount				3,000
International Finance Corporation [Member]
Detailed Information About Commitments [Line Items]
Maximum borrowing capacity				275,600
Capital commitments				69,808
Additional capital contribution for contingencies				$ 19,000
Guarantee payment provided		$ 2,777
Ordinary Wages And Unpaid Wages [Member]
Detailed Information About Commitments [Line Items]
Provision for loss contingencies | ₩	₩ 114,937

Subsequent Events - Summary of

Subsequent Events - Summary of Subsequent Events (Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2022 KRW (₩)
1339 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Jan. 03, 2023
Maturiy	Jan. 03, 2025
Interest rate (%)	4.40%
Amounts issued for the subsequent period	₩ 200,000
1340 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Jan. 03, 2023
Maturiy	Jan. 03, 2026
Interest rate (%)	4.50%
Amounts issued for the subsequent period	₩ 320,000
1341 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Jan. 05, 2023
Maturiy	Jan. 05, 2025
Interest rate (%)	4.20%
Amounts issued for the subsequent period	₩ 140,000
1342 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Jan. 05, 2023
Maturiy	Jan. 05, 2026
Interest rate (%)	4.30%
Amounts issued for the subsequent period	₩ 240,000
1343 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Jan. 09, 2023
Maturiy	Jan. 09, 2025
Interest rate (%)	4.20%
Amounts issued for the subsequent period	₩ 130,000
1344 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Jan. 09, 2023
Maturiy	Jan. 09, 2026
Interest rate (%)	4.28%
Amounts issued for the subsequent period	₩ 280,000
1345 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Jan. 12, 2023
Maturiy	Jan. 12, 2025
Interest rate (%)	4%
Amounts issued for the subsequent period	₩ 110,000
1346 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Jan. 12, 2023
Maturiy	Jan. 12, 2026
Interest rate (%)	4.08%
Amounts issued for the subsequent period	₩ 330,000
1347 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Jan. 16, 2023
Maturiy	Jan. 16, 2025
Interest rate (%)	4%
Amounts issued for the subsequent period	₩ 190,000
1348 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Jan. 16, 2023
Maturiy	Jan. 16, 2026
Interest rate (%)	4.05%
Amounts issued for the subsequent period	₩ 220,000
1349 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Jan. 19, 2023
Maturiy	Jan. 19, 2025
Interest rate (%)	3.85%
Amounts issued for the subsequent period	₩ 180,000
1350 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Jan. 19, 2023
Maturiy	Jan. 19, 2026
Interest rate (%)	3.87%
Amounts issued for the subsequent period	₩ 320,000
1351 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Jan. 25, 2023
Maturiy	Jan. 25, 2025
Interest rate (%)	3.85%
Amounts issued for the subsequent period	₩ 140,000
1352 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Jan. 25, 2023
Maturiy	Jan. 25, 2026
Interest rate (%)	3.89%
Amounts issued for the subsequent period	₩ 410,000
1353 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Feb. 03, 2023
Maturiy	Feb. 03, 2025
Interest rate (%)	3.50%
Amounts issued for the subsequent period	₩ 220,000
1354 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Feb. 03, 2023
Maturiy	Feb. 03, 2026
Interest rate (%)	3.54%
Amounts issued for the subsequent period	₩ 280,000
1355 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Feb. 06, 2023
Maturiy	Feb. 06, 2025
Interest rate (%)	3.65%
Amounts issued for the subsequent period	₩ 210,000
1356 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Feb. 06, 2023
Maturiy	Feb. 06, 2026
Interest rate (%)	3.65%
Amounts issued for the subsequent period	₩ 320,000
1357 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Feb. 10, 2023
Maturiy	Feb. 10, 2025
Interest rate (%)	3.80%
Amounts issued for the subsequent period	₩ 100,000
1358 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Feb. 10, 2023
Maturiy	Feb. 10, 2026
Interest rate (%)	3.83%
Amounts issued for the subsequent period	₩ 340,000
1359 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Feb. 13, 2023
Maturiy	Feb. 13, 2025
Interest rate (%)	3.83%
Amounts issued for the subsequent period	₩ 180,000
1360 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Feb. 13, 2023
Maturiy	Feb. 13, 2026
Interest rate (%)	3.85%
Amounts issued for the subsequent period	₩ 320,000
1361 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Feb. 17, 2023
Maturiy	Feb. 17, 2025
Interest rate (%)	3.99%
Amounts issued for the subsequent period	₩ 110,000
1362 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Feb. 17, 2023
Maturiy	Feb. 17, 2026
Interest rate (%)	4.10%
Amounts issued for the subsequent period	₩ 320,000
1363 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Feb. 20, 2023
Maturiy	Feb. 20, 2025
Interest rate (%)	4.09%
Amounts issued for the subsequent period	₩ 150,000
1364 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Feb. 20, 2023
Maturiy	Feb. 20, 2026
Interest rate (%)	4.11%
Amounts issued for the subsequent period	₩ 160,000
1365 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 03, 2023
Maturiy	Mar. 03, 2025
Interest rate (%)	4.35%
Amounts issued for the subsequent period	₩ 100,000
1366 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 03, 2023
Maturiy	Mar. 03, 2026
Interest rate (%)	4.40%
Amounts issued for the subsequent period	₩ 110,000
1367 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 06, 2023
Maturiy	Mar. 06, 2025
Interest rate (%)	4.25%
Amounts issued for the subsequent period	₩ 180,000
1368 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 06, 2023
Maturiy	Mar. 06, 2026
Interest rate (%)	4.35%
Amounts issued for the subsequent period	₩ 210,000
1369 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 10, 2023
Maturiy	Mar. 10, 2025
Interest rate (%)	4.25%
Amounts issued for the subsequent period	₩ 230,000
1370 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 10, 2023
Maturiy	Mar. 10, 2026
Interest rate (%)	4.35%
Amounts issued for the subsequent period	₩ 230,000
1371 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 13, 2023
Maturiy	Mar. 13, 2025
Interest rate (%)	4.14%
Amounts issued for the subsequent period	₩ 140,000
1372 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 13, 2023
Maturiy	Mar. 13, 2026
Interest rate (%)	4.25%
Amounts issued for the subsequent period	₩ 260,000
1373 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 22, 2023
Maturiy	Mar. 22, 2025
Interest rate (%)	3.97%
Amounts issued for the subsequent period	₩ 160,000
1374 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 22, 2023
Maturiy	Mar. 22, 2026
Interest rate (%)	4%
Amounts issued for the subsequent period	₩ 70,000
1375 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 30, 2023
Maturiy	Mar. 30, 2025
Interest rate (%)	3.98%
Amounts issued for the subsequent period	₩ 240,000
1376 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 30, 2023
Maturiy	Mar. 30, 2026
Interest rate (%)	3.99%
Amounts issued for the subsequent period	₩ 160,000
1377 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 04, 2023
Maturiy	Apr. 04, 2025
Interest rate (%)	3.99%
Amounts issued for the subsequent period	₩ 270,000
1378 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 04, 2023
Maturiy	Apr. 04, 2026
Interest rate (%)	4%
Amounts issued for the subsequent period	₩ 260,000
1379 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 07, 2023
Maturiy	Apr. 07, 2025
Interest rate (%)	3.95%
Amounts issued for the subsequent period	₩ 210,000
1380 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 07, 2023
Maturiy	Apr. 07, 2026
Interest rate (%)	3.95%
Amounts issued for the subsequent period	₩ 190,000
1381 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 12, 2023
Maturiy	Apr. 12, 2025
Interest rate (%)	3.91%
Amounts issued for the subsequent period	₩ 240,000
1382 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 12, 2023
Maturiy	Apr. 12, 2026
Interest rate (%)	3.95%
Amounts issued for the subsequent period	₩ 170,000
1383 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 21, 2023
Maturiy	Apr. 21, 2025
Interest rate (%)	3.89%
Amounts issued for the subsequent period	₩ 200,000
70-1 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Hydro & Nuclear Power Co., Ltd.
Issue date	Feb. 22, 2023
Maturiy	Feb. 22, 2028
Interest rate (%)	4.10%
Amounts issued for the subsequent period	₩ 90,000
70-2 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Hydro & Nuclear Power Co., Ltd.
Issue date	Feb. 22, 2023
Maturiy	Feb. 22, 2033
Interest rate (%)	4.15%
Amounts issued for the subsequent period	₩ 40,000
70-3 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Hydro & Nuclear Power Co., Ltd.
Issue date	Feb. 22, 2023
Maturiy	Feb. 22, 2043
Interest rate (%)	4.08%
Amounts issued for the subsequent period	₩ 20,000
71-1 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Hydro & Nuclear Power Co., Ltd.
Issue date	Mar. 07, 2023
Maturiy	Mar. 07, 2028
Interest rate (%)	4.13%
Amounts issued for the subsequent period	₩ 50,000
71-2 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Hydro & Nuclear Power Co., Ltd.
Issue date	Mar. 07, 2023
Maturiy	Mar. 07, 2033
Interest rate (%)	4.18%
Amounts issued for the subsequent period	₩ 30,000
72-1 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Hydro & Nuclear Power Co., Ltd.
Issue date	Apr. 26, 2023
Maturiy	Apr. 26, 2028
Interest rate (%)	3.91%
Amounts issued for the subsequent period	₩ 130,000
72-2 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Hydro & Nuclear Power Co., Ltd.
Issue date	Apr. 26, 2023
Maturiy	Apr. 26, 2043
Interest rate (%)	4%
Amounts issued for the subsequent period	₩ 90,000
57-1 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea South-East Power Co., Ltd.
Issue date	Feb. 09, 2023
Maturiy	Feb. 08, 2024
Interest rate (%)	3.56%
Amounts issued for the subsequent period	₩ 120,000
57-2 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea South-East Power Co., Ltd.
Issue date	Feb. 09, 2023
Maturiy	Feb. 09, 2026
Interest rate (%)	3.74%
Amounts issued for the subsequent period	₩ 50,000
57-1 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Western Power Co., Ltd.
Issue date	Jan. 17, 2023
Maturiy	Jan. 17, 2025
Interest rate (%)	4.07%
Amounts issued for the subsequent period	₩ 70,000
57-2 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Western Power Co., Ltd.
Issue date	Jan. 17, 2023
Maturiy	Jan. 17, 2026
Interest rate (%)	4.04%
Amounts issued for the subsequent period	₩ 30,000
58-1 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Western Power Co., Ltd.
Issue date	Apr. 20, 2023
Maturiy	Apr. 20, 2026
Interest rate (%)	3.98%
Amounts issued for the subsequent period	₩ 200,000
58-2 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Western Power Co., Ltd.
Issue date	Apr. 20, 2023
Maturiy	Apr. 20, 2028
Interest rate (%)	4.13%
Amounts issued for the subsequent period	₩ 40,000
58-3 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Western Power Co., Ltd.
Issue date	Apr. 20, 2023
Maturiy	Apr. 20, 2043
Interest rate (%)	3.94%
Amounts issued for the subsequent period	₩ 20,000
67-1 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Southern Power Co., Ltd.
Issue date	Jan. 12, 2023
Maturiy	Jan. 12, 2024
Interest rate (%)	3.97%
Amounts issued for the subsequent period	₩ 100,000
67-2 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Southern Power Co., Ltd.
Issue date	Jan. 12, 2023
Maturiy	Jan. 10, 2025
Interest rate (%)	4.04%
Amounts issued for the subsequent period	₩ 40,000
68-1 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Southern Power Co., Ltd.
Issue date	Apr. 13, 2023
Maturiy	Apr. 12, 2024
Interest rate (%)	3.63%
Amounts issued for the subsequent period	₩ 150,000
68-2 Corporate Bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Southern Power Co., Ltd.
Issue date	Apr. 13, 2023
Maturiy	Apr. 13, 2026
Interest rate (%)	3.76%
Amounts issued for the subsequent period	₩ 50,000

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - Conversion Of Investments In Debt Instruments Into Equity Investments As A Result Of Restructuring Of Investee [Member] - Bidiai Co Limited [Member] - Korea SouthEast Power [Member] ₩ in Billions	Feb. 17, 2023 KRW (₩)
Disclosure of non-adjusting events after reporting period [line items]
Investment in equity shares as a result of conersion of debt into equity of the investee company	₩ 32
Proportion of ownership interest in associate	32.54%