Korea Electric Power (KEP) 20-F 29 Apr 22 2021 FY Annual report (foreign) Financial data

Cover Page

Cover Page	12 Months Ended
	Dec. 31, 2021shares
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, 2021
Amendment Flag	false
Document Fiscal Year Focus	2021
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, the Republic of 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	Yoonjue Lee
City Area Code	61
Local Phone Number	345 4213
Contact Personnel Email Address	yoonjue.lee@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	[1]
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
[1]	Not for trading, but only in connection with the listing of American depositary shares on the New York Stock Exchange, pursuant to the requirements of the Securities and Exchange Commission.

Consolidated Statements of Fina

Consolidated Statements of Financial Position - KRW (₩) ₩ in Millions	Dec. 31, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents (Notes 5,6,7 and 45)	₩ 2,635,238	₩ 2,029,584
Current financial assets, net (Notes 5,6,9,11,12,13,45 and 47)	1,868,796	2,800,220
Trade and other receivables, net (Notes 5,8,20,24,45,46 and 47)	8,122,415	7,918,470
Inventories, net (Note 14)	7,608,182	6,742,909
Income tax receivables (Note 41)	41,344	49,675
Current non-financial assets (Note 15)	1,758,991	1,020,158
Assets held for sale (Note 16 and 42)	15,879	925
Total current assets	22,050,845	20,561,941
Non-current assets
Non-current financial assets, net (Notes 5,6,9,10,11,12,13,45 and 47)	2,909,810	2,472,821
Non-current trade and other receivables, net (Notes 5,8,20,45,46 and 47)	1,906,861	1,861,569
Property, plant and equipment, net (Notes 18,24,27 and 49)	173,119,781	168,709,387
Investment properties, net (Notes 19 and 27)	212,784	225,195
Goodwill (Notes 16 and 51)	105,647	98,166
Intangible assets other than goodwill, net (Notes 21,27 and 46)	1,044,077	1,055,730
Investments in associates (Notes 4 and 17)	5,232,373	4,250,787
Investments in joint ventures (Notes 4 and 17)	2,239,011	1,919,746
Defined benefit assets, net (Note 25)	20,871	7,231
Deferred tax assets (Note 41)	1,901,992	1,733,146
Non-current non-financial assets (Note 15)	364,818	246,392
Total non-current assets	189,058,025	182,580,170
Total Assets (Note 4)	211,108,870	203,142,111
Current liabilities
Trade and other payables, net (Notes 5,22,24,45 and 47)	8,153,426	6,256,521
Current financial liabilities, net (Notes 5,12,23,45 and 47)	14,037,125	10,724,689
Income tax payables (Note 41)	229,460	476,898
Current non-financial liabilities (Notes 20,28 and 29)	6,466,333	5,971,450
Current provisions (Notes 26 and 45)	2,845,876	2,451,664
Total current liabilities	31,732,220	25,881,222
Non-current liabilities
Non-current trade and other payables, net (Notes 5,22,24,45 and 47)	5,996,498	6,480,412
Non-current financial liabilities, net (Notes 5,12,23,45 and 47)	66,570,419	59,365,011
Non-current non-financial liabilities (Notes 28 and 29)	10,216,364	9,661,941
Employee benefits liabilities, net (Notes 25 and 45)	1,679,158	1,910,860
Deferred tax liabilities (Note 41)	7,100,938	9,100,247
Non-current provisions (Notes 26 and 45)	22,501,424	20,075,572
Total non-current liabilities	114,064,801	106,594,043
Total liabilities (Note 4)	145,797,021	132,475,265
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	1,604,910	1,604,910
Voluntary reserves	33,282,817	32,179,066
Unappropriated retained earnings	10,359,255	17,349,625
Retained earnings (Note 31)	45,246,982	51,133,601
Other capital surplus	1,231,109	1,224,105
Accumulated other comprehensive loss	(57,632)	(409,577)
Other equity	13,294,973	13,294,973
Other components of equity (Note 34)	14,468,450	14,109,501
Equity attributable to owners of the controlling company	63,769,010	69,296,680
Non-controlling interests (Notes 16 and 33)	1,542,839	1,370,166
Total Equity	65,311,849	70,666,846
Total Liabilities and Equity	₩ 211,108,870	₩ 203,142,111

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of comprehensive income [abstract]
Total revenue from external customers (Notes 4, 35, 45, 47)	₩ 59,913,607	₩ 57,925,837	₩ 58,568,082
Sales of goods	58,702,209	56,684,312	56,894,876
Sales of construction services (Note 20)	754,998	812,175	1,264,916
Sales of services	456,400	429,350	408,290
Cost of sales	(63,559,178)	(51,804,596)	(57,779,835)
Cost of sales (Notes 14,25,43 and 47)	(62,079,313)	(50,353,315)	(55,750,468)
Cost of sales of construction services	(898,963)	(1,009,430)	(998,766)
Cost of sales of services	(580,902)	(441,851)	(1,030,601)
Gross profit (loss)	(3,645,571)	6,121,241	788,247
Selling and administrative expenses (Notes 25,36,43 and 47)	(2,875,784)	(2,678,443)	(2,669,576)
Other income (Note 28 and 37)	1,034,133	1,036,448	997,973
Other expenses (Note 37)	(257,932)	(417,720)	(241,913)
Other gains (losses), net (Note 38)	8,519	35,094	(582,258)
Operating profit (loss) (Note 4)	(5,736,635)	4,096,620	(1,707,527)
Finance income (Notes 5,12 and 39)	1,402,614	1,510,249	1,009,706
Finance expenses (Notes 5,12 and 40)	(3,245,777)	(2,896,443)	(2,782,156)
Share in profit of associates and joint ventures	775,588	398,972	257,673
Gain on disposal of investments in associates and joint ventures	1,844	10,165	70,094
Share in loss of associates and joint ventures	(218,532)	(119,848)	(90,853)
Loss on disposal of investments in associates and joint ventures	(64,119)	(16)	(2)
Impairment loss on investments in associates and joint ventures	0	(1,556)	(22,517)
Loss on disposal of investments in subsidiaries	(197)	(6,610)	(256)
Profit (loss) related to associates, joint ventures and subsidiaries (Notes 4,16 and 17)	494,584	281,107	214,139
Profit (loss) before income tax	(7,085,214)	2,991,533	(3,265,838)
Income tax benefit (expense) (Note 41)	1,855,989	(899,064)	1,002,303
Profit (loss) for the year	(5,229,225)	2,092,469	(2,263,535)
Other comprehensive income (loss), net of tax (Notes 5,12,25,31 and 34)	599,614	(219,841)	135,196
Items that will not be reclassified subsequently to profit or loss:
Remeasurements of defined benefit liability (Notes 25 and 31)	210,409	(69,804)	42,315
Share in other comprehensive income (loss) of associates and joint ventures (Note 31)	3,609	3,181	(6,789)
Net change in fair value of financial assets at fair value through other comprehensive income (Note 34)	59,024	(8,532)	(11,732)
Items that are or 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)	(15,778)	64,561	19,242
Foreign currency translation of foreign operations (Note 34)	41,189	(76,442)	72,816
Share in other comprehensive income (loss) of associates and joint ventures (Note 34)	301,161	(132,805)	19,344
Total comprehensive income (loss) for the year	(4,629,611)	1,872,628	(2,128,339)
Profit (loss) attributable to:
Owners of the controlling company (Note 44)	(5,315,055)	1,991,347	(2,345,517)
Non-controlling interests	85,830	101,122	81,982
Profit (loss) for the year	(5,229,225)	2,092,469	(2,263,535)
Total comprehensive income (loss) attributable to:
Owners of the controlling company	(4,754,046)	1,802,824	(2,239,147)
Non-controlling interests	124,435	69,804	110,808
Total comprehensive income (loss) for the year	₩ (4,629,611)	₩ 1,872,628	₩ (2,128,339)
Earnings (loss) per share (in won) ((Note 44)
Basic earnings (loss) per share	₩ (8,279)	₩ 3,102	₩ (3,654)
Diluted earnings (loss) per share	₩ (8,279)	₩ 3,102	₩ (3,654)

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, 2018	₩ 71,092,762	₩ 69,743,925	₩ 4,053,578	₩ 51,519,119	₩ 14,171,228	₩ 1,348,837
Comprehensive income
Profit (loss) for the year	(2,263,535)	(2,345,517)	0	(2,345,517)	0	81,982
Items that will not be reclassified subsequently to profit or loss:
Remeasurements of defined benefit liability, net of tax	42,315	36,160	0	36,160	0	6,155
Share in other comprehensive income (loss) of associates and joint ventures, net of tax	(6,789)	(6,789)	0	(6,789)	0	0
Net change in fair value of financial assets at fair value through other comprehensive income	(11,732)	(11,732)	0	0	(11,732)	0
Items that are or 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	19,242	14,041	0	0	14,041	5,201
Foreign currency translation of foreign operations, net of tax	72,816	55,347	0	0	55,347	17,469
Share in other comprehensive income (loss) of associates and joint ventures, net of tax	19,344	19,343	0	0	19,343	1
Dividends paid	(99,255)	0	0	0	0	(99,255)
Issuance of shares capital by subsidiaries	21,071	0	0	0	0	21,071
Transactions between consolidated entities	(8,137)	(8,460)	0	0	(8,460)	323
Changes in consolidation scope	24,932	0	0	0	0	24,932
Dividends paid (hybrid bond)	(13,385)	0	0	0	0	(13,385)
Other changes in equity	0	0	0	(840)	840	0
Ending 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	2,092,469	1,991,347	0	1,991,347	0	101,122
Items that will not be reclassified subsequently to profit or loss:
Remeasurements of defined benefit liability, net of tax	(69,804)	(62,857)	0	(62,857)	0	(6,947)
Share in other comprehensive income (loss) of associates and joint ventures, net of tax	3,181	3,181	0	3,181	0	0
Net change in fair value of financial assets at fair value through other comprehensive income	(8,532)	(8,533)	0	0	(8,533)	1
Items that are or 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	64,561	58,523	0	0	58,523	6,038
Foreign currency translation of foreign operations, net of tax	(76,442)	(46,032)	0	0	(46,032)	(30,410)
Share in other comprehensive income (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)
Issuance of shares capital by subsidiaries	(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	70,666,846	69,296,680	4,053,578	51,133,601	14,109,501	1,370,166
Comprehensive income
Profit (loss) for the year	(5,229,225)	(5,315,055)	0	(5,315,055)	0	85,830
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 in other comprehensive income (loss) 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	59,024	59,022	0	0	59,022	2
Items that are or 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 in other comprehensive income (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)
Issuance of shares capital by subsidiaries	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	₩ 65,311,849	₩ 63,769,010	₩ 4,053,578	₩ 45,246,982	₩ 14,468,450	₩ 1,542,839

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities
Profit (loss) for the year	₩ (5,229,225)	₩ 2,092,469	₩ (2,263,535)
Adjustments to reconcile profit (loss) for the year to net cash provided by operating activities:
Income tax expense (benefit)	(1,855,989)	899,064	(1,002,303)
Depreciation	11,772,111	11,377,553	10,971,825
Amortization	166,161	170,466	156,915
Employee benefit expense	511,942	492,288	725,120
Bad debt expense	67,242	50,686	16,629
Interest expense	1,914,457	1,995,425	2,046,811
Loss on disposal of financial assets	1,045	648	2,106
Loss on disposal of property, plant and equipment	92,622	162,725	72,508
Loss on abandonment of property, plant and equipment	207,934	255,346	364,233
Loss on impairment of property, plant and equipment	4,056	80,413	50,034
Loss on impairment of intangible assets	0	3,599	513,609
Loss on disposal of intangible assets	145	392	827
Increase in provisions	2,466,452	1,832,765	2,301,215
Loss (gain) on foreign currency translation, net	997,119	(782,167)	370,309
Gain on valuation of financial assets at fair value through profit or loss	(14,338)	(12,904)	(5,575)
Loss on valuation of financial assets at fair value through profit or loss	5,480	7,396	4,513
Valuation and transaction loss (gain) on derivative instruments, net	(907,076)	390,322	(403,765)
Share in profit of associates and joint ventures, net	(557,056)	(279,124)	(166,820)
Gain on disposal of financial assets	(7,718)	(11,992)	(3,866)
Reversal of impairment loss on intangible assets	(14)	0	0
Gain on disposal of property, plant and equipment	(56,284)	(93,195)	(43,784)
Gain on disposal of intangible assets	(1)	(1,556)	(206)
Gain on disposal of investments in associates and joint ventures	(1,844)	(10,165)	(70,094)
Loss on disposal of investments in associates and joint ventures	64,119	16	2
Impairment loss on investments in associates and joint ventures	0	1,556	22,517
Loss on disposal of investments in subsidiaries	197	6,610	256
Interest income	(221,874)	(242,586)	(268,118)
Dividend income	(10,522)	(7,316)	(13,838)
Others, net	(169,856)	30,411	128,237
Adjustments for Cash flows from operating activities	14,468,510	16,316,676	15,769,297
Changes in working capital:
Trade receivables	(216,734)	(107,639)	95,345
Non-trade receivables	869,870	459,524	64,027
Accrued income	(17,918)	(258,963)	83,589
Other receivables	24,306	(32,536)	(116,583)
Other current assets	(569,732)	(462,125)	(271,986)
Inventories	(1,738,000)	(723,495)	(980,216)
Other non-current assets	(3,462)	(140,017)	(611,066)
Trade payables	2,144,561	(262,985)	(546,159)
Non-trade payables	(571,051)	(363,260)	192,506
Accrued expenses	(456,992)	(222,113)	(454,501)
Other current liabilities	379,378	388,163	373,403
Other non-current liabilities	458,007	755,005	650,468
Investments in associates and joint ventures (dividends received)	288,242	237,695	215,612
Provisions	(2,426,017)	(1,499,436)	(1,473,461)
Payments of employee benefit obligations	(159,477)	(74,848)	(65,242)
Plan assets	(317,707)	(582,275)	(348,386)
Changes in working capital	(2,312,726)	(2,889,305)	(3,192,650)
Cash generated from operating activities	6,926,559	15,519,840	10,313,112
Dividends received (financial assets at fair value through other comprehensive income)	10,522	7,316	24,255
Interest paid	(1,928,160)	(2,081,663)	(2,027,850)
Interest received	201,022	215,183	186,122
Income taxes paid	(736,757)	(452,203)	(282,211)
Net cash provided by operating activities	4,473,186	13,208,473	8,213,428
Cash flows from investing activities
Proceeds from disposals of investments in associates and joint ventures	4,472	5,444	0
Acquisition of investments in associates and joint ventures	(673,017)	(342,116)	(107,821)
Proceeds from disposals of property, plant and equipment	277,998	331,777	522,742
Acquisition of property, plant and equipment	(12,668,534)	(13,281,294)	(14,000,359)
Proceeds from disposals of intangible assets	59	10,871	7,702
Acquisition of intangible assets	(113,100)	(120,371)	(229,426)
Proceeds from disposals of financial assets	7,023,674	8,020,406	2,783,474
Acquisition of financial assets	(5,893,404)	(9,203,450)	(2,165,342)
Increase in loans	(223,950)	(336,744)	(335,773)
Collection of loans	218,704	215,292	292,745
Increase in deposits	(222,924)	(276,255)	(280,637)
Decrease in deposits	166,066	280,941	275,314
Proceeds from disposals of assets held-for-sale	1,148	32,578	30,662
Receipt of government grants	37,920	41,209	21,705
Cash outflow from merger	0	0	(154,311)
Net cash outflow from changes in consolidation scope	(63,492)	(24,624)	(2,917)
Other cash outflow from investing activities, net	(225,948)	(185,475)	(157,116)
Net cash used in investing activities	(12,354,328)	(14,831,811)	(13,499,358)
Cash flows from financing activities
Proceeds from short-term borrowings, net	1,621,440	345,338	188,957
Proceeds from long-term borrowings and debt securities	17,392,311	10,170,107	13,221,407
Repayment of long-term borrowings and debt securities	(9,360,357)	(7,976,658)	(7,068,290)
Payment of lease liabilities	(572,036)	(613,977)	(573,437)
Settlement of derivative instruments, net	98,068	42,263	102,146
Change in non-controlling interests	90,096	11,554	17,365
Dividends paid (hybrid bond)	(13,385)	(13,385)	(13,385)
Dividends paid	(812,159)	(81,298)	(99,356)
Other cash outflow from financing activities, net	(8,901)	(3,120)	0
Net cash provided by financing activities	8,435,077	1,880,824	5,775,407
Net increase in cash and cash equivalents before effect of exchange rate fluctuations	553,935	257,486	489,477
Effect of exchange rate fluctuations on cash held	51,719	(38,031)	(37,693)
Net increase in cash and cash equivalents	605,654	219,455	451,784
Cash and cash equivalents at January 1	2,029,584	1,810,129	1,358,345
Cash and cash equivalents at December 31	₩ 2,635,238	₩ 2,029,584	₩ 1,810,129

Reporting Entity (Description o

Reporting Entity (Description of the controlling company)	12 Months Ended
	Dec. 31, 2021
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 As of December 31, 2021, KEPCO’s share capital amounts to W follows: Number of Percentage of ownership The Government of the Republic of Korea 116,841,794 18.20 % Korea Development Bank (KDB) 211,235,264 32.90 % Foreign investors 91,105,897 14.19 % Other 222,781,122 34.71 % 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, 2021
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, 2022 and authorized on April 22, 2022 for the purpose of Form 20-F (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, 2020 and 2021 are ￦1,691,294 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) Early shutdown of the Wolsong Unit 1 nuclear power plant and changes in new nuclear power plants construction The 30-year According to the Eighth Basic Plan for Electricity Supply and Demand announced by the Ministry of Trade, Industry and Energy in 2017, the 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, decided to shut down the 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, the NSSC approved permanent shutdown of the Wolsong Unit 1. In addition, the Company has also decided to discontinue the construction of the Cheonji Unit 1 and 2 and Daejin Unit 1 and 2 pursuant to the Korean government’s energy transformation 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, the Shin-Hanwool 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 the Shin-Hanwool 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. In relation to the Korean government’s nuclear phase-out plan pursuant to its energy transformation policy, the Korean government has established a legal basis and relevant procedures to make up for the Company’s losses relating to the decommissioning of the nuclear power plants to be achieved in stages. As of December 31, 2021, there is no indication that the above-mentioned impairment has ceased to exist or reduced. 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 Changes in accounting standards effective from January 1, 2021 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, 2021, even though the early adoption of these standards is possible. Amendments to IFRS 9 ’Financial Instruments’, IAS 39 ‘Financial Instruments: Recognition and Measurement’, IFRS 7 ‘Financial Instruments: Disclosures’, IFRS 4 ‘Insurance Contracts’ and IFRS 16 ‘ Leases’ The amendments provide temporary reliefs which address the financial reporting effects when an interbank offered rate (IBOR) is replaced with an alternative nearly risk-free interest rate (RFR). The amendments include the following practical expedients: • A practical expedient to require contractual changes, or changes to cash flows that are directly required by the reform, to be treated as changes to a floating interest rate, equivalent to a movement in a market rate of interest • Permit changes required by IBOR reform to be made to hedge designations and hedge documentation without the hedging relationship being discontinued • Provide temporary relief to entities from having to meet the separately identifiable requirement when an RFR instrument is designated as a hedge of a risk component

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2021
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, 2020, 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 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 (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 (9) Leases, continued (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 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

Segment, Geographic and Other I

Segment, Geographic and Other Information	12 Months Ended
	Dec. 31, 2021
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, 2019, 2020 and 2021, respectively, are as follows: 2019 Segment Total segment Intersegment Revenue Depreciation Interest Interest Profit Employee Loss on Increase in Operating In millions of won Transmission and distribution ￦ 58,328,372 1,336,725 56,991,647 3,814,428 73,478 777,120 140,757 298,144 350,865 987,828 (2,568,529 ) Electric power generation (Nuclear) 8,937,026 8,908,803 28,223 3,227,695 37,277 511,864 (5,497 ) 132,283 — 672,134 782,511 Electric power generation (Non-nuclear) 24,254,957 23,472,153 782,804 3,955,333 35,626 655,466 77,641 163,626 13,364 766,407 551,287 Plant maintenance & engineering service 2,627,539 2,254,841 372,698 125,546 14,214 2,861 1,237 124,745 — 124,242 312,341 Others 1,049,324 656,614 392,710 127,364 141,262 134,248 — 18,409 4 2,408 (489,585 ) Consolidation adjustments (36,629,136 ) (36,629,136 ) — (121,626 ) (33,739 ) (34,748 ) — (12,087 ) — (251,804 ) (295,552 ) ￦ 58,568,082 — 58,568,082 11,128,740 268,118 2,046,811 214,138 725,120 364,233 2,301,215 (1,707,527 ) Finance income 1,009,706 Finance expense (2,782,156 ) Gain related to associates, joint ventures and subsidiaries 214,139 Loss before income tax ￦ (3,265,838 ) 2020 Segment Total segment Intersegment Revenue Depreciation Interest Interest Profit (loss) Employee Loss on Increase in Operating In millions of won Transmission and distribution ￦ 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 1,582,001 1,096,663 485,338 122,092 167,005 162,843 — 50,889 940 3,711 148,393 Consolidation adjustments (33,974,121 ) (33,974,121 ) — (127,628 ) (30,852 ) (32,472 ) — (49,605 ) — (169,651 ) (291,187 ) ￦ 57,925,837 — 57,925,837 11,548,019 242,586 1,995,425 281,107 492,288 255,346 1,832,765 4,096,620 Finance income 1,510,249 Finance expense (2,896,443 ) Gain related to associates, joint ventures and subsidiaries 281,107 Loss before income tax ￦ 2,991,533 2021 Segment Total segment Intersegment Revenue Depreciation Interest Interest Profit (loss) Employee Loss on Increase in Operating 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) 25,837,982 24,518,167 1,319,815 4,178,520 22,226 624,391 109,765 121,020 5,672 285,152 364,572 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 2,010,843 1,295,423 715,420 158,952 158,680 162,345 — 52,698 — 2,981 200,363 Consolidation adjustments (39,064,782 ) (39,064,782 ) — (122,751 ) (27,587 ) (29,710 ) — (36,187 ) — 89,818 (64,775 ) ￦ 59,913,607 — 59,913,607 11,938,272 221,874 1,914,457 494,584 511,942 207,934 2,466,452 (5,736,635 ) Finance income 1,402,614 Finance expense (3,245,777 ) Gain related to associates, joint ventures and subsidiaries 494,584 Profit before income tax ￦ (7,085,214 ) (3) Information related to segment assets and segment liabilities as of and for the years ended December 31, 2020 and 2021 are as follows: 2020 Segment Segment assets Investments Acquisition of non-current Segment In millions of won Transmission and distribution ￦ 113,115,667 4,204,090 6,535,380 59,772,046 Electric power generation (Nuclear) 61,850,865 116,867 2,419,939 35,652,467 Electric power generation (Non-nuclear) 54,531,155 1,807,409 3,758,795 33,292,680 Plant maintenance & engineering service 3,492,571 42,167 141,226 1,061,949 Others 8,923,046 — 577,056 4,039,220 Segment totals 241,913,304 6,170,533 13,432,396 133,818,362 Consolidation adjustments: Elimination of inter-segment amounts (39,762,888 ) — (30,731 ) (6,749,728 ) Equity method adjustment 1,372,001 — — — Deferred taxes 47,664 — — 5,417,629 Others (427,970 ) — — (10,998 ) (38,771,193 ) — (30,731 ) (1,343,097 ) Consolidated totals ￦ 203,142,111 6,170,533 13,401,665 132,475,265 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) 57,304,296 2,575,019 3,331,813 35,803,289 Plant maintenance & engineering service 3,672,366 53,617 110,330 1,086,926 Others 10,861,823 — 637,715 4,961,880 Segment totals 252,045,653 7,471,384 12,793,635 148,745,359 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 ￦ 211,108,870 7,471,384 12,781,634 145,797,021 (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 assets is determined by the location of the customers and of the assets: Revenue from external customers Non-current assets (*2) Geographical unit 2019 2020 2021 2019 2020 2021 In millions of won Domestic ￦ 56,942,128 56,774,578 58,672,484 169,366,365 173,673,478 178,745,707 Overseas (*1) 1,625,954 1,151,259 1,241,123 2,743,755 2,831,925 3,572,784 ￦ 58,568,082 57,925,837 59,913,607 172,110,120 176,505,403 182,318,491 (*1) Middle East and other Asian countries make up the majority of overseas revenue and non-current assets. Since the overseas revenue or non-current assets attributable to particular countries are not material, they are not disclosed individually. (*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, 2019, 2020 and 2021.

Classification of Financial Ins

Classification of Financial Instruments	12 Months Ended
	Dec. 31, 2021
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, 2020 and 2021 are as follows: 2020 Financial assets Financial assets Financial assets Derivative assets Total In millions of won Current assets Cash and cash equivalents ￦ — — 2,029,584 — 2,029,584 Current financial assets Current financial assets at fair value through profit or loss 1,196,101 — — — 1,196,101 Current financial assets at amortized costs — — 13,149 — 13,149 Current derivative assets 18,332 — — 11,193 29,525 Other financial assets — — 1,561,445 — 1,561,445 Trade and other receivables — — 7,918,470 — 7,918,470 1,214,433 — 11,522,648 11,193 12,748,274 Non-current assets Non-current financial assets Non-current financial assets at fair value through profit or loss 685,281 — — — 685,281 Non-current financial assets at fair value through other comprehensive income — 358,559 — — 358,559 Non-current financial assets at amortized costs — — 1,273 — 1,273 Non-current derivative assets 92,432 — — 44,456 136,888 Other financial assets — — 1,290,820 — 1,290,820 Trade and other receivables — — 1,861,569 — 1,861,569 777,713 358,559 3,153,662 44,456 4,334,390 ￦ 1,992,146 358,559 14,676,310 55,649 17,082,664 2021 Financial assets Financial assets Financial assets Derivative assets 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 assets Non-current financial assets Non-current financial assets at fair value through profit or loss 672,031 — — — 672,031 Non-current financial assets at fair value through other comprehensive income — 435,107 — — 435,107 Non-current financial assets at amortized costs — — 9,851 — 9,851 Non-current derivative assets 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 (2) Classification of financial liabilities as of December 31, 2020 and 2021 are as follows: 2020 Financial liabilities at fair value through profit or loss Financial liabilities Derivative liabilities Total In millions of won Current liabilities Borrowings ￦ — 2,113,181 — 2,113,181 Debt securities — 8,561,624 — 8,561,624 Derivative liabilities 13,053 — 36,831 49,884 Trade and other payables — 6,256,521 — 6,256,521 13,053 16,931,326 36,831 16,981,210 Non-current liabilities Borrowings — 3,003,999 — 3,003,999 Debt securities — 56,045,777 — 56,045,777 Derivative liabilities 144,873 — 170,362 315,235 Trade and other payables — 6,480,412 — 6,480,412 144,873 65,530,188 170,362 65,845,423 ￦ 157,926 82,461,514 207,193 82,826,633 2021 Financial liabilities at fair value through profit or loss Financial liabilities Derivative liabilities 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 liabilities 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 (3) Classification of comprehensive income (loss) from financial instruments for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Cash and cash equivalents Interest income ￦ 42,861 9,419 12,692 Gain (loss) on foreign currency transactions and translations (3,332 ) (15,911 ) 34,923 Financial assets at fair value through profit or loss Interest income 29,411 19,114 18,415 Dividends income 6,984 4,734 2,949 Gain (loss) on valuation of derivatives 151,604 (52,447 ) 450,896 Gain (loss) on transaction of derivatives 63,329 36,563 54,352 Gain (loss) on valuation of financial assets 1,062 5,508 8,858 Gain (loss) on disposal of financial assets 1,760 11,344 4,221 Financial assets at fair value through other comprehensive income Dividends income 6,854 2,582 7,573 Financial assets at amortized cost Interest income 539 612 797 Gain (loss) on foreign currency transactions and translations (690 ) (1,733 ) (3,647 ) Loans Interest income 63,448 26,232 25,196 Gain (loss) on foreign currency transactions and translations (631 ) (527 ) 729 Trade and other receivables Interest income 69,941 151,035 144,543 Gain (loss) on disposal of financial assets — — 2,452 Gain (loss) on foreign currency transactions and translations (31,500 ) 23,458 14,207 Short-term financial instruments Interest income 49,070 25,540 7,531 Gain (loss) on foreign currency transactions and translations 39,845 (38,088 ) 32,218 Long-term financial instruments Interest income 12,794 10,406 12,470 Gain (loss) on foreign currency transactions and translations — — 27 Other financial assets Interest income 54 228 230 Derivatives (applying hedge accounting) Gain (loss) on valuation of derivatives (profit or loss) 123,730 (77,733 ) 211,180 Gain (loss) on valuation of derivatives (equity, before tax) 38,305 9,925 (11,734 ) Gain (loss) on transaction of derivatives 65,651 36,053 31,351 Financial liabilities at fair value through profit or loss Gain (loss) on valuation of derivatives 27,686 (104,607 ) 2,751 Gain (loss) on transaction of derivatives (493 ) (49,788 ) (15,358 ) Financial liabilities carried at amortized cost Interest expense of borrowings and debt securities 1,394,328 1,365,801 1,316,269 Gain (loss) on repayment of financial liabilities — (35 ) (10 ) Interest expense of trade and other payables 94,019 88,757 213,765 Interest expense of others 558,464 540,867 384,423 Other finance income — — 1,284 Other finance expenses — — 2,504 Gain (loss) on foreign currency transactions and translations (409,867 ) 772,045 (1,162,835 ) Derivatives (applying hedge accounting) Gain (loss) on valuation of derivatives (profit or loss) 14,330 (220,928 ) 158,167 Gain (loss) on valuation of derivatives (equity, before tax) (2,578 ) 101,295 (28,726 ) Gain (loss) on transaction of derivatives (42,072 ) 42,565 13,737

Restricted Deposits

Restricted Deposits	12 Months Ended
	Dec. 31, 2021
Restricted Deposits [Abstract]
Restricted Deposits	6. Restricted Deposits Restricted deposits as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Cash and cash equivalents Escrow accounts ￦ 544 — Deposits for government project and others 5,066 22,286 Collateral provided for borrowings 117,747 264,813 Collateral provided for lawsuit 42 42 Deposits for transmission regional support program 5,469 5,921 Deposits for other business purposes — 3,050 Short-term financial instruments Restriction on withdrawal related to ‘win-win growth program’ for small and medium enterprises and others 109,000 114,000 Collateral provided for borrowings — 11,745 Non-current financial assets at fair value through profit or loss Decommissioning costs of nuclear power plants 577,481 531,720 Long-term financial instruments Escrow accounts 76 70 Guarantee deposits for banking accounts at oversea branches 306 333 Collateral provided for borrowings 11,745 — Decommissioning costs of nuclear power plants 258,282 324,609 Funds for developing small and medium enterprises (*) 210,000 10,000 ￦ 1,295,758 1,288,589 (*) As of December 31, 2020, it consisted of the deposits for small and medium enterprises at the Industrial Bank of Korea (IBK) and others for construction of Bitgaram Energy Valley and support for high potential businesses amounting to ￦200,000 million and the deposits were returned during the year ended December 31, 2021.

Cash and Cash Equivalents

Cash and Cash Equivalents	12 Months Ended
	Dec. 31, 2021
Cash and cash equivalents [abstract]
Cash and Cash Equivalents	7. Cash and Cash Equivalents Cash and cash equivalents as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Cash ￦ 871 19,623 Other demand deposits 1,291,058 1,825,751 Short-term deposits classified as cash equivalents 432,263 407,921 Short-term investments classified as cash equivalents 305,392 381,943 ￦ 2,029,584 2,635,238

Trade and Other Receivables

Trade and Other Receivables	12 Months Ended
	Dec. 31, 2021
Trade and other receivables [abstract]
Trade and Other Receivables	8. Trade and Other Receivables (1) Trade and other receivables as of December 31, 2020 and 2021 are as follows: 2020 Gross Allowance for doubtful accounts Present value discount Book In millions of won Current assets Trade receivables ￦ 7,370,923 (208,184 ) — 7,162,739 Other receivables 799,598 (42,332 ) (1,535 ) 755,731 8,170,521 (250,516 ) (1,535 ) 7,918,470 Non-current assets Trade receivables 227,261 (806 ) — 226,455 Other receivables 1,728,486 (90,047 ) (3,325 ) 1,635,114 1,955,747 (90,853 ) (3,325 ) 1,861,569 ￦ 10,126,268 (341,369 ) (4,860 ) 9,780,039 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 assets 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 (2) Other receivables as of December 31, 2020 and 2021 are as follows: 2020 Gross Allowance for doubtful accounts Present value Book In millions of won Current assets Non-trade receivables ￦ 441,031 (37,062 ) — 403,969 Accrued income 38,956 — — 38,956 Deposits 239,011 — (1,535 ) 237,476 Finance lease receivables(*1) 57,084 (365 ) — 56,719 Others 23,516 (4,905 ) — 18,611 799,598 (42,332 ) (1,535 ) 755,731 Non-current assets Non-trade receivables 215,136 (80,451 ) — 134,685 Accrued income 834 — — 834 Deposits 364,855 — (3,325 ) 361,530 Finance lease receivables(*2) 1,065,982 (625 ) — 1,065,357 Others 81,679 (8,971 ) — 72,708 1,728,486 (90,047 ) (3,325 ) 1,635,114 ￦ 2,528,084 (132,379 ) (4,860 ) 2,390,845 (*1)  Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of ￦105,127 million. (*2)  Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of ￦1,087,559 million.       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. (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, 2020 and 2021 are as follows: 2020 2021 In millions of won Trade receivables: (not overdue) ￦ 7,274,773 7,603,472 Trade receivables: (impairment reviewed) 323,411 325,775 Less than 60 days 3,505 11,577 60 ~ 90 days 28,729 27,201 90 ~ 120 days 10,687 28,230 120 days ~ 1 year 34,036 51,945 Over 1 year 246,454 206,822 7,598,184 7,929,247 Less: allowance for doubtful accounts (208,990 ) (205,339 ) ￦ 7,389,194 7,723,908 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, 2020 and 2021 are as follows: 2020 2021 In millions of won Other receivables: (not overdue) ￦ 2,363,967 2,251,474 Other receivables: (impairment reviewed) 164,117 143,534 Less than 60 days 46,399 87 60 ~ 90 days 31,183 4,881 90 ~ 120 days 1,873 1,248 120 days ~ 1 year 11,803 11,438 Over 1 year 72,859 125,880 2,528,084 2,395,008 Less: allowance for doubtful accounts (132,379 ) (82,710 ) Less: present value discount (4,860 ) (6,930 ) ￦ 2,390,845 2,305,368 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, 2019, 2020 and 2021 are as follows: 2019 2020 2021 Trade Other Trade Other Trade Other In millions of won Beginning balance ￦ 215,868 104,726 212,759 114,155 208,990 132,379 Bad debt expense 29,221 19,206 24,021 27,329 19,039 18,411 Write-off (10,106 ) (1,146 ) (20,332 ) (1,910 ) (21,809 ) (58,762 ) Reversal (41,940 ) — (3,373 ) (2,464 ) (1,071 ) (79 ) Others 19,716 (8,631 ) (4,085 ) (4,731 ) 190 (9,239 ) Ending balance ￦ 212,759 114,155 208,990 132,379 205,339 82,710

Financial Assets at Fair Value

Financial Assets at Fair Value through Profit or Loss	12 Months Ended
	Dec. 31, 2021
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, 2020 and 2021 are as follows: 2020 2021 Current Non-current Current Non-current In millions of won Financial assets at fair value through profit or loss Beneficiary Certificate ￦ 1,313 155,122 629 206,160 Cooperative — 5,692 — 5,797 Other (*) 1,194,788 312,401 360,204 202,003 1,196,101 473,215 360,833 413,960 Financial assets designated as at fair value through profit or loss Debt with embedded derivatives — 212,066 — 258,071 ￦ 1,196,101 685,281 360,833 672,031 (*) ‘Other’ includes MMT, etc. (2) Details of income (loss) from financial assets at fair value through profit or loss for the years ended December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Beneficiary Certificate ￦ 6,127 13,632 Cooperative 645 110 Debt with embedded derivatives 3,598 854 Other 30,329 19,848 ￦ 40,699 34,444

Financial Assets at Fair Valu_2

Financial Assets at Fair Value through Other Comprehensive Income	12 Months Ended
	Dec. 31, 2021
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, 2020 and 2021 are as follows: 2020 Beginning Acquisition Disposal Valuation Others Ending In millions of won Listed ￦ 201,201 — (4 ) (7,809 ) 1,281 194,669 Unlisted 177,969 2,900 (1 ) (23,128 ) 6,150 163,890 379,170 2,900 (5 ) (30,937 ) 7,431 358,559 Current financial assets at fair value through other comprehensive income ￦ — — — — — — Non-current financial assets at fair value through other comprehensive income 379,170 2,900 (5 ) (30,937 ) 7,431 358,559 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 financial assets at fair value through other comprehensive income 358,559 10,929 (8,221 ) 68,777 5,063 435,107 (2) Financial assets at fair value through other comprehensive income as of December 31, 2020 and 2021 are as follows: 2020 Shares Ownership Acquisition cost Book value Fair value In millions of won Listed Korea District Heating Corp. 2,264,068 19.55 % ￦ 173,201 91,356 91,356 Ssangyong Motor Co., Ltd. 38,568 0.03 % 428 107 107 SM Korea Line Corp. 180 0.00 % 1 1 1 Namkwang Engineering & Construction Co., Ltd. 121 0.00 % 15 1 1 Bumyang Construction Co., Ltd. 35 0.00 % 2 — — Elcomtec 32,875 0.04 % 217 49 49 P an 1,492 0.00 % 14 7 7 Dongbu Corp. 955 0.02 % 12 13 13 KSP Co., Ltd. 22,539 0.08 % 53 34 34 STX Heavy Industries Co., Ltd. 7,419 0.12 % 107 29 29 Codes Combine Co., Ltd. 291 0.00 % 1 1 1 PT Adaro Energy Tbk. 480,000,000 1.50 % 65,028 53,127 53,127 Energy Fuels Inc. 1,711,814 1.31 % 16,819 7,888 7,888 Bunji Corporation Limited 99,763 0.07 % 18,445 — — Denison Mines Corp. 58,284,000 9.76 % 84,134 41,776 41,776 Fission 3.0 75,000 0.05 % — 6 6 Fission Uranium Corp. 800,000 0.16 % 785 266 266 SangSangin Industry Co., Ltd.(formerly, DMC Co., Ltd.) 5,831 0.02 % 38 4 4 Vitzosys Co., Ltd. 399 0.00 % 2 2 2 EMnI Co., Ltd. 1,257 0.00 % 25 2 2 359,327 194,669 194,669 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 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 % 15 15 15 KC Development Co., Ltd. 839 0.02 % 6 6 6 Imhwa 329 0.11 % 5 5 5 Dalim 58 0.08 % 10 10 10 ASA Jeonju 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 Co., Ltd. 2,512 0.25 % 126 21 21 Buyoung Co., Ltd. 270 0.00 % 3 3 3 Ilsuk Co., Ltd. 152 0.17 % 10 10 10 Dongyang Telecom Co., Ltd. 1,760 0.01 % 11 1 1 Jongwon Remicon Co., Ltd. 31 0.18 % 13 13 13 Zyle Daewoo Motor Sales Co., Ltd. 22 0.00 % — — — Daewoo Development Co., Ltd. 8 0.00 % — — — Seyang Inc. 537 0.05 % 27 27 27 2020 Shares Ownership Acquisition cost Book value Fair value In millions of won Seungri Enterprise Co., Ltd. 93 0.05 % 3 3 3 Shin-E P&C Co., Ltd. 1,569 0.64 % 111 3 3 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 Shinil Engineering Co., Ltd. 887 0.06 % 3 3 3 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 Kolmar Pharma Co., Ltd. 1,426 0.01 % 52 3 3 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 25 25 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 2020 Shares Ownership Acquisition cost Book value Fair value In millions of won Dong Yang Metal Co., Ltd. 2,951 1.97 % 161 147 147 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 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 Tae Hyung Co., Ltd. 28 0.43 % 20 20 20 Younil Metal Co., Ltd. 41 0.21 % 21 21 21 Hankook Precision Ind Co., Ltd. 110 0.06 % 3 3 3 CJ Paradise Co.,Ltd 24 0.02 % 12 12 12 Han Young Technology Company Co.,Ltd. 35 0.00 % — — — 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 6 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 2,379 0.60 % 12 12 12 Shin kwang Industrial Co., Ltd. 884 0.35 % 55 55 55 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 PT. Kedap Saayq 671 10.00 % 18,540 — — Set Holding (*2) 1,100,220 2.50 % 229,255 143,765 143,765 PT. Cirebon Energi Prasarana 22,420 10.00 % 2,612 2,440 2,440 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 % 159 159 159 Sungsan Parts Co., Ltd. 629 0.80 % 63 63 63 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 Yeong-gwang Remicon Co., Ltd. 15 0.12 % 2 2 2 NTS Co., Ltd. 143 0.22 % 36 36 36 2020 Shares Ownership Acquisition cost Book value Fair value In millions of won AID C o 1,212 0.57 % 36 36 36 Changwon Eco-friendly farming Corp. 3 0.01 % — — — Kumo Hitech Co., Ltd. 6,697 0.53 % 100 100 100 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 Shinseung Chemical Industy Co., Ltd. 5 0.01 % 60 60 60 KJ Alloy Co., Ltd. 368 0.20 % 7 7 7 SM Hi-tech Co., Ltd. 22 0.39 % 22 22 22 Keum Mun Industry Co., Ltd. 1,320 0.97 % 330 56 56 Puruen Environment Co., Ltd. 967 1.34 % 19 19 19 Miretech Co., Ltd. 9,111 0.27 % 18 18 18 SIE Co., Ltd. 12 0.02 % 1 1 1 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 Tech Co., Ltd. 1,159 6.28 % 81 81 81 Wongwang Door Corp. 575 1.00 % 29 29 29 Seobu Highway Solar Co., Ltd. 19,460 2.86 % 195 195 195 Dongbu Highway Solar Co., Ltd. 19,020 4.99 % 190 190 190 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 % 2 2 2 Daechang HRSG Co.,Ltd. 618 0.12 % 62 62 62 Shinjin International Corp. 4 0.01 % 1 1 1 Daewoon Shell Tech Co., Ltd. 666 2.81 % 33 33 33 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 Daedong Millennium 159 0.42 % 32 32 32 Daeji Product Co., Ltd. 15 0.05 % 1 — — Cheong Hae Myeong Ga Co.,Ltd. 1,867 0.11 % 5 5 5 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 83 83 KMLC Co., Ltd. 281 0.14 % 22 22 22 2020 Shares Ownership Acquisition Book value Fair value In millions of won 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 K orea 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 Enaindustry Co., Ltd. 201 0.28 % 141 141 141 TCT Co., Ltd. 3,277 0.55 % 82 82 82 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 % — — — Sung Ae Co., Ltd. 190 0.80 % 10 10 10 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 HIC Co., Ltd. 7,408 0.71 % 111 111 111 Addies Direct Co., Ltd. 1 0.00 % — — — World 131 1.09 % 10 10 10 Superone Co., Ltd. 1,585 1.45 % 8 8 8 Deok-u Co., Ltd. 1,626 1.92 % 195 195 195 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 Dongjin Foundry Industry Co., Ltd. 966 4.10 % 193 193 193 Yooseung Co., Ltd. 10 0.08 % 1 1 1 Sungkwang Co., Ltd. 48 0.35 % 2 2 2 Taeyang Gasteel 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 2020 Shares Ownership Acquisition cost Book value Fair value In millions of won TK Co., Ltd. 307 0.70 % 15 15 15 Sungdo Co., Ltd. 130 1.10 % 52 52 52 KSM Tecj Co., Ltd. 25 0.11 % 1 1 1 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 Sungshin Parts Co., Ltd. 345 0.40 % 14 14 14 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 Co., Ltd. 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 Koomin Precisions Co., Ltd. 124 0.26 % 12 12 12 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 Tpp Co., Ltd. 36,645 11.72 % 1,832 1,832 1,832 Kuklim Plastic New Technology Co., Ltd. 393 0.29 % 8 8 8 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 Co., Ltd. 38 0.02 % 1 1 1 Newclean Livestock Co., Ltd. 86 0.17 % 4 4 4 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 Panax Korea Co., Ltd. 58 0.14 % 9 9 9 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 Para Belleza Co., Ltd 1,211 1.74 % 74 74 74 Dongsung Co., Ltd. 1,983 1.63 % 198 198 198 Ssangyong Youngweol Plant Service&Engineering Co., Ltd. 83 0.07 % 4 4 4 SH Co., Ltd. 31 0.20 % 6 6 6 2020 Shares Ownership Acquisition Book value Fair value In millions of won Namsunnam Co., Ltd. 1,275 0.19 % 6 6 6 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 37 37 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 82 82 SGC Energy Co., Ltd. 580,000 5.00 % 2,900 2,900 2,900 Ihsung CNI Co., Ltd. 13,526 18.22 % 3,000 3,000 3,000 H Robotics Co., Ltd. 9,192 4.55 % 1,000 1,000 1,000 Good Tcells Co., Ltd. 11,364 0.34 % 500 500 500 275,496 163,890 163,890 ￦ 634,823 358,559 358,559 (*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, 2020. 2021 Shares Ownership Acquisition 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 32,875 0.04 % 217 42 42 P an 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 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 329 0.11 % 5 5 5 Dalim 58 0.08 % 10 10 10 ASA Jeonju 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 Co., Ltd. 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 Seungri Enterprise Co., Ltd. 93 0.05 % 3 3 3 Shin-E P&C Co., Ltd. 1,569 0.64 % 111 2 2 Ejung Ad Co., Ltd. 132 0.09 % 3 3 3 2021 Shares Ownership Acquisition Book value Fair value In millions of won 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 Sung Kwang Co., Ltd. 23 0.37 % 6 6 6 Shinheung P 699 0.14 % 35 35 35 2021 Shares Ownership Acquisition Book value Fair value In millions of won 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 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 C 143 0.22 % 36 36 36 AID C o 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 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 Shinseung Chemical Industy Co., Ltd. 5 0.01 % 60 60 60 KJ Alloy Co., Ltd. 368 0.20 % 7 7 7 SM Hi-tech Co., Ltd. 22 0.39 % 22 22 22 2021 Shares Ownership Acquisition Book value Fair value In millions of won 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 Tech Co., Ltd. 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 Daedong Millennium 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 K orea 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., . 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 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 2021 Shares Ownership Acquisition Book value Fair value In millions of won 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 G 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 Co., Ltd. 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 % — — — 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 2021 Shares Ownership Acquisition Book value Fair value In millions of won Geumdani Co., Ltd. 2,377 1.82 % 36 36 36 Mezzanine I-pack Co., Ltd. 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 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 2021 Shares Ownership Acquisition cost Book value Fair value In millions of won 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 E&C Co., Ltd. 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 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 2021 Shares Ownership Acquisition cost Book value Fair value In millions of won 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 Metal Co., Ltd. 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.,

Financial Assets at Amortized C

Financial Assets at Amortized Cost	12 Months Ended
	Dec. 31, 2021
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, 2020 and 2021 are as follows: 2020 Financial assets at amortized cost Government grants Allowance for doubtful accounts Others Book value In millions of won Government bonds ￦ 1,422 — — — 1,422 Others 13,000 — — — 13,000 ￦ 14,422 — — — 14,422 Current ￦ 13,149 — — — 13,149 Non-current 1,273 — — — 1,273 2021 Financial assets at amortized cost Government grants Allowance for doubtful accounts Others 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

Derivatives

Derivatives	12 Months Ended
	Dec. 31, 2021
Derivatives [Abstract]
Derivatives	12. Derivatives (1) Derivatives as of December 31, 2020 and 2021 are as follows: 2020 2021 Current Non-current Current Non-current In millions of won Derivative assets Currency forward ￦ 18,332 — 559 6,899 Currency swap 11,193 127,386 125,877 506,957 —Trading — 82,931 92,313 335,765 —Hedging 11,193 44,455 33,564 171,192 Interest rate swap — 9,502 502 6,980 —Trading — 9,502 502 6,980 —Hedging — — — — Others — — — 9 ￦ 29,525 136,888 126,938 520,845 Derivative liabilities Currency forward ￦ 10,014 4,977 301 — Currency swap 36,088 232,669 4,446 16,708 —Trading — 93,245 4,446 15,576 —Hedging 36,088 139,424 — 1,132 Interest rate swap 3,782 66,451 2,544 28,138 —Trading 2,192 22,687 174 2,829 —Hedging 1,590 43,764 2,370 25,309 Others (*1,2,3) — 11,138 — 25,894 ￦ 49,884 315,235 7,291 70,740 (*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’. (*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, 2021 are as follows: Contract Maturity date Contract amounts Contract exchange rate (in won) Counterparty Pay Receive In millions of won and thousands of USD except contract exchange rate information Korea Development Bank 2021.09.27 2022.01.07 ￦ 59,049 USD 50,050 ￦ 1,179.80 Shinhan Bank 2021.12.13 2022.01.04 17,354 USD 14,720 1,178.95 Hana Bank 2021.12.24 2022.01.11 1,185 USD 1,000 1,185.35 Hana Bank 2021.12.30 2022.01.06 11,840 USD 10,004 1,183.53 Kookmin Bank 2021.12.23 2022.01.14 11,869 USD 10,000 1,186.92 Mizuho Bank 2021.12.27 2022.01.17 11,862 USD 10,000 1,186.20 Morgan Stanley 2021.12.24 2022.01.13 11,865 USD 10,000 1,186.50 Nonghyup Bank 2021.12.10 2022.01.03 11,746 USD 10,000 1,174.60 Nonghyup Bank 2021.12.30 2022.01.18 11,880 USD 10,000 1,188.00 Nonghyup Bank 2021.12.23 2022.01.12 5,921 USD 5,000 1,184.10 Standard Chartered 2021.12.24 2022.01.13 11,796 USD 10,000 1,179.62 Woori Bank 2021.12.16 2022.01.13 8,985 USD 7,590 1,183.90 Woori Bank 2021.12.29 2022.01.20 11,870 USD 10,000 1,187.00 JP Morgan 2021.12.23 2022.01.04 14,243 USD 12,000 1,186.88 JP Morgan 2021.12.23 2022.01.04 6,532 USD 5,500 1,187.68 HSBC 2021.12.30 2022.01.07 16,601 USD 14,000 1,185.77 JP Morgan 2021.12.30 2022.01.07 16,601 USD 14,000 1,185.82 Nonghyup Bank 2021.12.23 2022.01.10 11,871 USD 10,000 1,187.10 Standard Chartered 2021.12.23 2022.01.12 10,690 USD 9,000 1,187.80 Mizuho Bank 2021.12.29 2022.01.03 5,932 USD 5,000 1,186.40 JP Morgan 2021.12.29 2022.01.03 4,744 USD 4,000 1,186.00 HSBC 2021.12.29 2022.01.20 5,936 USD 5,000 1,187.14 HSBC 2021.12.30 2022.01.21 17,771 USD 15,000 1,184.70 MUFG 2021.12.30 2022.01.25 5,925 USD 5,000 1,184.90 HSBC 2020.10.19 2024.10.29 140,913 USD 125,000 1,127.30 HSBC 2021.11.30 2022.01.07 5,939 USD 5,000 1,187.70 HSBC 2021.11.30 2022.01.07 5,934 USD 5,000 1,186.70 HSBC 2021.11.30 2022.01.07 5,929 USD 5,000 1,185.70 Woori Bank 2021.12.01 2022.01.07 11,856 USD 10,000 1,185.55 Woori Bank 2021.12.29 2022.01.28 11,885 USD 10,000 1,188.50 MUFG 2021.12.29 2022.01.28 11,876 USD 10,000 1,187.55 Woori Bank 2021.12.30 2022.01.28 11,852 USD 10,000 1,185.20 Woori Bank 2021.12.23 2022.02.18 8,316 USD 7,000 1,188.00 HSBC 2021.12.29 2022.02.18 11,880 USD 10,000 1,188.00 Shinhan Bank 2021.12.24 2022.02.25 5,938 USD 5,000 1,187.50 Hana Bank 2021.12.24 2022.02.25 5,935 USD 5,000 1,186.99 Standard Chartered 2021.12.29 2022.02.25 11,885 USD 10,000 1,188.50 MUFG 2021.12.17 2022.03.18 259 USD 219 1,183.74 (3) Currency swap contracts which are not designated as hedging instruments as of December 31, 2021 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 Citibank 2012~2022 112,930 USD 100,000 2.79% 3.00% 1,129.30 JP Morgan 2012~2022 112,930 USD 100,000 2.79% 3.00% 1,129.30 Bank of America 2012~2022 112,930 USD 100,000 2.79% 3.00% 1,129.30 Shinhan Bank 2016~2022 112,930 USD 100,000 2.79% 3.00% 1,129.30 HSBC 2012~2022 111,770 USD 100,000 2.89% 3.00% 1,117.70 Hana Bank 2012~2022 111,770 USD 100,000 2.87% 3.00% 1,117.70 Standard Chartered 2012~2022 111,770 USD 100,000 2.89% 3.00% 1,117.70 Deutsche Bank 2012~2022 55,885 USD 50,000 2.79% 3.00% 1,117.70 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 Citibank 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 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, 2021 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 Korea Development Bank 2019~2022 112,650 USD 100,000 1.80% 3.38% 1,126.50 Kookmin Bank 2019~2022 112,650 USD 100,000 1.80% 3.38% 1,126.50 Woori Bank 2019~2022 112,650 USD 100,000 1.80% 3.38% 1,126.50 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 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 2019~2022 117,340 USD 100,000 1.06% 2.38% 1,173.40 Hana Bank 2019~2022 117,340 USD 100,000 1.06% 2.38% 1,173.40 Kookmin Bank 2019~2022 117,340 USD 100,000 1.06% 2.38% 1,173.40 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 Hana Bank 2017~2022 226,600 USD 200,000 1.94% 2.63% 1,133.00 Korea Development Bank 2017~2022 113,300 USD 100,000 1.94% 2.63% 1,133.00 Nomura 2017~2022 113,300 USD 100,000 1.95% 2.63% 1,133.00 Woori Bank 2017~2022 56,650 USD 50,000 1.95% 2.63% 1,133.00 Kookmin Bank 2017~2022 56,650 USD 50,000 1.95% 2.63% 1,133.00 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 (5) Interest rate swap contracts which are not designated as hedging instruments as of December 31, 2021 are as follows: Counterparty Contract Contract amount Contract interest rate per annum Pay Receive In millions of won Hana Bank 2017~2022 ￦ 100,000 2.01% 3M CD + 0.24% Hana Bank 2017~2022 100,000 2.06% 3M CD + 0.27% 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% Societe Generale 2017~2022 200,000 3M Libor + 3.44% 3.77% 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% (*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, 2021 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 60,316 4.16% 6M USD Libor KFW 2009~2027 USD 60,316 4.16% 6M USD Libor Export-Import Bank of Korea 2016~2036 USD 71,116 3.00% 6M USD Libor (7) Gain and loss on valuation and transaction of derivatives for the years ended December 31, 2019, 2020 and 2021 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 2019 2020 2021 2019 2020 2021 2019 2020 2021 In millions of won Currency forward ￦ 24,265 (40,590 ) 33,066 12,488 (17,911 ) 33,032 — — — Currency swap 310,732 (406,607 ) 787,264 110,813 93,557 61,353 38,802 105,642 (59,108 ) - Trading 172,087 (108,090 ) 420,551 52,842 16,661 16,265 — — — - Hedging 138,645 (298,517 ) 366,713 57,971 76,896 45,088 38,802 105,642 (59,108 ) Interest rate swap (16,231 ) (1,845 ) 18,123 (36,886 ) (10,253 ) (10,303 ) (3,075 ) 5,578 18,648 - Trading (15,647 ) (309 ) 18,123 (2,495 ) (11,975 ) (10,303 ) — — — - Hedging (584 ) (1,536 ) — (34,391 ) 1,722 — (3,075 ) 5,578 18,648 Other derivatives (1,416 ) (6,673 ) (15,459 ) — — — — — — ￦ 317,350 (455,715) 822,994 86,415 65,393 84,082 35,727 111,220 (40,460) (*) For the year ended December 31, 2021, the net loss on valuation of derivatives applying cash flow hedge accounting of ￦15,778 million, net of tax, is included in other comprehensive income (loss).

Other Financial Assets

Other Financial Assets	12 Months Ended
	Dec. 31, 2021
Other Financial Assets [Abstract]
Other Financial Assets	13. Other Financial Assets (1) Other financial assets as of December 31, 2020 and 2021 are as follows: 2020 2021 Current Non-current Current Non-current In millions of won Loans ￦ 78,806 762,555 88,406 903,397 Less: Allowance for doubtful accounts (1 ) (20,266 ) (10 ) (52,667 ) Less: Present value discount (842 ) (30,090 ) (807 ) (29,248 ) 77,963 712,199 87,589 821,482 Long-term / short-term financial instruments 1,483,482 578,621 1,278,014 450,494 ￦ 1,561,445 1,290,820 1,365,603 1,271,976 (2) Loans as of December 31, 2020 and 2021 are as follows: 2020 Face value Allowance for Present value Carrying value In millions of won Short-term loans Loans for tuition ￦ 33,864 — (842 ) 33,022 Loans for housing 21,988 — — 21,988 Fisheries loan 3,816 — — 3,816 Other loans 19,138 (1 ) — 19,137 78,806 (1 ) (842 ) 77,963 Long-term loans Loans for tuition 420,274 (9,091 ) (30,090 ) 381,093 Loans for housing 237,100 — — 237,100 Loans for related parties 50,682 (1,047 ) — 49,635 Other loans 54,499 (10,128 ) — 44,371 762,555 (20,266 ) (30,090 ) 712,199 ￦ 841,361 (20,267 ) (30,932 ) 790,162 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 (3) Changes in the allowance for doubtful accounts of loans for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Beginning balance ￦ 4,952 15,094 20,267 Bad debt expense 10,142 5,173 30,942 Other — — 1,468 Ending balance ￦ 15,094 20,267 52,677 (4) Long-term and short-term financial instruments as of December 31, 2020 and 2021 are as follows: 2020 2021 Current Non-current Current Non-current In millions of won Time deposits ￦ 996,265 160,433 976,899 103,607 CD 50,000 — — — RP 203,008 — — — Others 234,209 418,188 301,115 346,887 ￦ 1,483,482 578,621 1,278,014 450,494

Inventories

Inventories	12 Months Ended
	Dec. 31, 2021
Classes of current inventories [abstract]
Inventories	14. Inventories Inventories as of December 31, 2020 and 2021 are as follows: 2020 Acquisition cost Valuation allowance Book value In millions of won Raw materials ￦ 3,602,073 (885 ) 3,601,188 Merchandises 234 — 234 Work-in-progress 148,067 — 148,067 Finished goods 42,070 — 42,070 Supplies 2,280,682 (7,892 ) 2,272,790 Inventories-in-transit 666,967 — 666,967 Other inventories 11,593 — 11,593 ￦ 6,751,686 (8,777 ) 6,742,909 2021 Acquisition cost Valuation allowance Book value 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 The reversals of the allowance for loss on inventory valuation due to increase in the net realizable value of inventories deducted from cost of sales for the years ended December 31, 2019, 2020 and 2021 were ￦4,872 million, ￦2,020 million and ￦11,422 million, respectively. The amounts of loss from inventory valuation included in other gains or losses for the years ended December 31, 2019, 2020 and 2021 were ￦3,127 million, ￦4,998 million and ￦7,761 million, respectively.

Non-Financial Assets

Non-Financial Assets	12 Months Ended
	Dec. 31, 2021
Disclosure Of Other Assets [Abstract]
Non-Financial Assets	15. Non-Financial Assets Non-financial assets as of December 31, 2020 and 2021 are as follows: 2020 2021 Current Non-current Current Non-current In millions of won Advanced payments ￦ 169,737 32,693 161,466 124,305 Prepaid expenses 216,073 140,730 756,729 151,095 Others (*1) 634,348 72,969 840,796 89,418 ￦ 1,020,158 246,392 1,758,991 364,818 (*1)  Details of others as of December 31, 2020 and 2021 are as follows: 2020 2021 Current Non-current Current Non-current In millions of won Greenhouse gas emissions rights ￦ 357,355 — 524,658 — Other quick assets 276,993 72,969 316,138 89,418 ￦ 634,348 72,969 840,796 89,418

Consolidated Subsidiaries

Consolidated Subsidiaries	12 Months Ended
	Dec. 31, 2021
Disclosure of subsidiaries [abstract]
Consolidated Subsidiaries	16. Consolidated Subsidiaries (1) Consolidated subsidiaries as of December 31, 2020 and 2021 are as follows: Percentage of ownership (%) Subsidiaries Key operation activities Location 2020 2021 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. 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 % Korea Imouraren Uranium Investment Corp. Holding company France 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 % DG Fairhaven Power, LLC Power generation USA 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 % 100.00 % KOSEP USA, Inc. Power generation 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 % Percentage of ownership (%) Subsidiaries Key operation activities Location 2020 2021 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 % 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 % VI Carbon Professional Private Special Asset Investment Trust 1 Holding company Korea 96.67 % — Chitose Solar Power Plant LLC Power generation Japan 80.10 % 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 % 50.10 % KEPCO Solar of Alamosa LLC Power generation USA 100.00 % 100.00 % KEPCO Mangilao Holdings LLC(*6) Holding company USA 100.00 % 100.00 % Mangilao Investment LLC Holding company USA 100.00 % 100.00 % KEPCO Mangilao Solar, LLC Power generation USA 100.00 % 100.00 % Jeju Hanlim Offshore Wind Co., Ltd. Power generation Korea 75.99 % 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(*7) Holding company USA 100.00 % 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 % Percentage of ownership (%) Subsidiaries Key operation activities Location 2020 2021 Paju Ecoenergy Co., Ltd. Power generation Korea 89.00 % 89.00 % Guam Ukudu Power LLC Power generation USA 100.00 % 100.00 % 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 % 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 % Yeong Yang Apollon Photovoltaic Co., Ltd. Power generation Korea — 100.00 % Yeong Yang Corporation Co., Ltd. Power generation Korea — 100.00 % SolarVader Co., Ltd. Power generation Korea — 100.00 % Yeong Yang Innovation Co., Ltd. Power generation Korea — 100.00 % Yeong Yang Horus Photovoltaic Co., Ltd. Power generation Korea — 100.00 % Yeong Yang Solar Management Co., Ltd. Power generation Korea — 100.00 % LSG Hydro Power Limited Holding company Pakistan — 99.80 % KOEN Bio Co., Ltd. Wood pellet utilization business Korea — 70.00 % KOMIPO Energy Solution America, LLC Holding company USA — 100.00 % Elara Investment Holdings, LLC(*8) Holding company USA — 0.10 % Elara Equity Holdings, LLC Holding company USA — 51.22 % Elara Class B Holdings, LLC Holding company USA — 100.00 % Elara Class B Member, LLC Holding company USA — 100.00 % Elara Development Holdings, LLC Holding company USA — 100.00 % Elara Development, LLC Holding company USA — 100.00 % Elara Energy Holdings, LLC(*8) Holding company USA — 43.94 % Elara Energy Project, LLC Power generation USA — 100.00 % KOMIPO Iberian Solar Group, S.L.U. Holding company Spain — 100.00 % Jeongam Wind Power Co., Ltd. Power generation Korea — 80.00 % KOWEPO Europe B.V. Holding company Netherlands — 100.00 % CVS Equity Holdings, LLC Holding company USA — 100.00 % CVS Class B Holdings, LLC Holding company USA — 100.00 % CVS Development Holdings, LLC Holding company USA — 100.00 % CVS Development, LLC Holding company USA — 100.00 % CVS Class B Member, LLC Holding company USA — 100.00 % CVS Energy Holdings, LLC Holding company USA — 100.00 % Concho Valley Energy, LLC Holding company USA — 100.00 % Concho Valley Solar, LLC Power generation USA — 100.00 % Yeongdeok Sunrise Wind Power Co., Ltd. Power generation Korea — 70.00 % KHNP Spain, S.L. Holding company Spain — 100.00 % (*1) Considering treasury stocks, the effective percentage of ownership is 66.08%. (*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. (*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 84 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) As of the end of the reporting period, the Company does not have a shareholding; however, this subsidiary is included in the consolidated financial statements as the Company has control over the entity by virtue of the right to nominate all 4 members of the board of directors. (*7) As of the end of the reporting period, the Company does not have a shareholding; however, this subsidiary is included in the consolidated financial statements as the Company has control over the entity by virtue of the right to nominate the CEO and key management members. (*8) The effective percentage of ownership is less than 50%. However, this consolidated subsidiary is included in the consolidated financial statements as the Company has control over the board of directors under the shareholders’ agreement. (2) Subsidiaries newly included in and excluded from consolidation for the year ended December 31, 2021 are as follows: Subsidiaries included in consolidation during the year ended December 31, 2021. Subsidiaries Reason KHNP Chile SpA Newly established Yeong Yang Apollon Photovoltaic Co., Ltd. New investment Yeong Yang Corporation Co., Ltd. New investment SolarVader Co., Ltd. New investment Yeong Yang Innovation Co., Ltd. New investment Yeong Yang Horus Photovoltaic Co., Ltd. New investment Yeong Yang Solar Management Co., Ltd. New investment LSG Hydro Power Limited Newly established KOEN Bio Co., Ltd. Newly established KOMIPO Energy Solution America, LLC Newly established Elara Investment Holdings, LLC Newly established Elara Equity Holdings, LLC Newly established Elara Class B Holdings, LLC Newly established Elara Class B Member, LLC Newly established Elara Development Holdings, LLC Newly established Elara Development, LLC Newly established Elara Energy Holdings, LLC Newly established Elara Energy Project, LLC New investment KOMIPO Iberian Solar Group, S.L.U. New investment Prime Swedish Holding AB Newly established Jeongam Wind Power Co., Ltd. Change in a relationship KOWEPO Europe B.V. Newly established CVS Equity Holdings, LLC Newly established CVS Class B Holdings, LLC Newly established CVS Development Holdings, LLC Newly established CVS Development, LLC Newly established CVS Class B Member, LLC Newly established CVS Energy Holdings, LLC Newly established Concho Valley Energy, LLC Newly established Concho Valley Solar, LLC New investment Yeongdeok Sunrise Wind Power Co., Ltd. Newly established KHNP Spain, S.L. Newly established Subsidiaries excluded from consolidation during the year ended December 31, 2021. Subsidiaries Reason DG Fairhaven Power, LLC Disposal VI Carbon Professional Private Special Asset Investment Trust 1 Liquidation Prime Swedish Holding AB Change in a relationship KOSEP USA, Inc. Liquidation Korea Liquidation (3) Summary of financial information of consolidated subsidiaries as of and for the years ended December 31, 2020 and 2021 are as follows: 2020 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won Korea Hydro & Nuclear Power Co., Ltd. ￦ 61,859,753 35,652,467 9,938,941 647,641 Korea South-East Power Co., Ltd. 10,858,645 5,954,129 4,258,904 (139,149 ) Korea Midland Power Co., Ltd. 13,028,436 9,357,603 4,293,364 (29,880 ) Korea Western Power Co., Ltd. 10,357,023 6,594,779 3,605,986 (108,953 ) Korea Southern Power Co., Ltd. 10,658,015 6,411,524 4,015,941 (17,588 ) Korea East-West Power Co., Ltd. 9,619,485 4,974,645 4,155,416 (65,427 ) KEPCO Engineering & Construction Company, Inc. 699,244 200,169 431,723 20,160 KEPCO Plant Service & Engineering Co., Ltd. 1,345,857 296,515 1,299,186 85,916 KEPCO Nuclear Fuel Co., Ltd. 798,368 390,155 331,228 14,542 KEPCO KDN Co., Ltd. 647,496 174,192 641,308 45,207 KEPCO International HongKong Ltd. 120,213 — — 1,571 KEPCO International Philippines Inc. 133,215 366 — 35,182 KEPCO Gansu International Ltd. 7,753 512 — (19 ) KEPCO Philippines Holdings Inc. 187,375 127 — 65,792 KEPCO Philippines Corporation 6,173 17 — (187 ) KEPCO Ilijan Corporation 322,066 47,234 81,400 39,443 KEPCO Lebanon SARL 1,669 9,195 — (59 ) KEPCO Neimenggu International Ltd. 213,444 2,492 — 26,593 KEPCO Shanxi International Ltd. 508,363 196,408 — 2,278 KOMIPO Global Pte Ltd. 263,378 656 — 12,460 KEPCO Netherlands B.V. 117,449 71 — 14,503 Korea Imouraren Uranium Investment Corp. 13,955 123 — (675 ) KEPCO Australia Pty., Ltd. 451 17 — 71 KOSEP Australia Pty., Ltd. 34,249 3,500 14,327 2,150 KOMIPO Australia Pty., Ltd. 45,250 3,782 14,327 2,685 KOWEPO Australia Pty., Ltd. 44,270 2,909 14,327 1,663 KOSPO Australia Pty., Ltd. 38,341 2,750 14,327 2,242 KEPCO Middle East Holding Company 90,601 78,553 — (1,539 ) Qatrana Electric Power Company 464,507 287,859 21,279 24,717 KHNP Canada Energy Ltd. 63,794 26 — (7 ) KEPCO Bylong Australia Pty., Ltd. 44,691 349,542 — 16,897 Korea Waterbury Uranium Limited Partnership 20,908 165 — (76 ) KEPCO Holdings de Mexico 148 27 — (14 ) KST Electric Power Company, S.A.P.I. de C.V. 531,367 410,743 65,695 37,899 KEPCO Energy Service Company 2,255 994 5,880 507 KEPCO Netherlands S3 B.V. 44,042 54 — 2,833 PT. KOMIPO Pembangkitan Jawa Bali 12,946 3,298 20,306 4,775 PT. Cirebon Power Service 1,825 550 8,642 344 KOWEPO International Corporation — 10 — — KOSPO Jordan LLC 31,620 15,654 9,356 1,570 EWP America Inc.(*1) 37,681 2,683 14,312 (14,327 ) KNF Canada Energy Limited 1,871 22 — (50 ) EWP Barbados 1 SRL 313,409 1,170 2,950 44,729 Gyeonggi Green Energy Co., Ltd. 265,768 240,366 64,660 (9,968 ) PT. Tanggamus Electric Power 217,730 184,057 3,491 11,942 Gyeongju Wind Power Co., Ltd. 105,726 68,629 13,939 2,108 KOMIPO America Inc. 105,926 918 342 (1,783 ) KOSEP USA, Inc. 1 4,837 — — PT. EWP Indonesia 33,900 1,125 — 7,083 KEPCO Netherlands J3 B.V. 138,824 84 — 28,242 Korea Offshore Wind Power Co., Ltd. 354,643 187,576 26,838 98 Global One Pioneer B.V. 177 60 — (76 ) Global Energy Pioneer B.V. 338 64 — (70 ) Mira Power Limited 348,737 266,565 31,172 (2,960 ) KOSEP Material Co., Ltd. 2,312 429 3,457 189 2020 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won Commerce and Industry Energy Co., Ltd. ￦ 89,681 41,384 31,603 1,623 KEPCO KPS Philippines Corp. 3,119 284 5,151 158 KOSPO Chile SpA 128,795 48,813 — (542 ) PT. KOWEPO Sumsel Operation And Maintenance Services 108 241 — (15 ) Hee mang sunlight Power Co., Ltd. 7,261 4,339 423 (142 ) Fujeij Wind Power Company 194,844 174,051 — 13,720 KOSPO Youngnam Power Co., Ltd. 389,071 294,408 254,966 3,405 VI Carbon Professional Private Special Asset Investment Trust 1 3,006 4 — 7 Chitose Solar Power Plant LLC 133,643 118,783 17,073 1,521 KEPCO Energy Solution Co., Ltd. 313,754 4,093 5,585 3,656 KEPCO Solar Co., Ltd. 230,443 23,098 3,933 1,888 KOSPO Power Services Ltda. 4,354 1,644 10,846 1,011 Energy New Industry Specialized Investment Private Investment Trust(*2) 279,489 24,173 23,682 8,248 KOEN Bylong Pty., Ltd. 6 75 — (11 ) KOMIPO Bylong Pty., Ltd. 7 76 — (11 ) KOWEPO Bylong Pty., Ltd. 6 64 — — KOSPO Bylong Pty., Ltd. 153 213 — (2 ) EWP Bylong Pty., Ltd. 6 35 — 28 KOWEPO Lao International 8,982 392 8,466 4,706 KEPCO US Inc. 16,154 — — (21 ) KEPCO Alamosa LLC 31,353 270 127 (237 ) KEPCO Solar of Alamosa LLC 68,336 42,910 9,096 (2,052 ) KEPCO Mangilao Holdings LLC 25,785 28,924 — (502 ) Mangilao Investment LLC 38,090 14 — (15 ) KEPCO Mangilao Solar, LLC 69,830 34,029 — (253 ) Jeju Hanlim Offshore Wind Co., Ltd. 20,525 9,805 — (3,049 ) PT. Siborpa Eco Power 10,491 14 — (361 ) PT. Korea Energy Indonesia 1,746 196 2,428 190 KOLAT SpA 31,109 425 243 (216 ) KEPCO California, LLC 41,973 4,683 — (1,330 ) KEPCO Mojave Holdings, LLC 95,326 67,138 — (4,358 ) Incheon Fuel Cell Co., Ltd. 192,184 170,976 — (979 ) KOEN Service Co., Ltd. 6,239 5,598 32,150 129 KOMIPO Service Co., Ltd. 3,381 3,649 28,596 (479 ) KOWEPO Service Co., Ltd. 6,045 4,849 29,559 726 KOSPO Service Co., Ltd. 5,617 4,708 25,103 832 EWP Service Co., Ltd. 4,568 4,074 23,223 (15 ) PT. KOMIPO Energy Indonesia 2,473 154 2,391 52 KNF Partners Co., Ltd. 1,470 743 5,487 256 KOSPO USA Inc. 120,380 266 — (1,611 ) Nambu USA LLC 42,739 — — 544 Tamra Offshore Wind Power Co., Ltd. 150,957 112,184 22,200 4,575 KEPCO MCS Co., Ltd. 59,227 36,786 342,053 19,190 KEPCO FMS Co., Ltd. 14,390 12,585 89,228 837 Firstkeepers Co., Ltd. 13,981 12,234 68,538 2,994 Secutec Co., Ltd. 11,473 9,771 62,256 1,609 SE Green Energy Co., Ltd. 152,205 122,606 19,731 2,463 KEPCO Mangilao America LLC 1,793 — — — Mangilao Intermediate Holdings LLC 100,609 80,210 — (3,708 ) KEPCO CSC Co., Ltd. 8,817 5,551 38,465 2,479 KOAK Power Limited 15,864 1,118 — 607 2020 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won KOMIPO Europe B.V. ￦ 43,198 46 333 (386 ) Haenanum Energy Fund 28,219 132 128 (13 ) Paju Ecoenergy Co., Ltd. 57,320 3,506 3,069 247 Guam Ukudu Power LLC 3,165 3,589 — (1,577 ) TS Energy No. 25 Co., Ltd. 184,667 142,709 — (3,779 ) KPS Partners Co., Ltd. 2,139 1,127 3,562 313 KEPCO E&C Service Co., Ltd. 2,514 1,549 4,989 464 Moha solar Co., Ltd. 7,390 7,809 — (364 ) Ogiri Solar Power Co., Ltd. 1,032 — — — KHNP USA LLC 464 23 229 119 KOMIPO Vanphong Power Service LLC 1,727 12 — (34 ) Energy Innovation Fund I 8,412 1 25 (201 ) (*1) Financial information of EWP America Inc. includes that of four other subsidiaries, EWP Renewable Corporation, DG Fairhaven Power, LLC, California Power Holdings, LLC and EWPRC Biomass Holdings, LLC. (*2) 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 2021 Subsidiaries Total assets 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. 13,756,040 9,912,907 5,263,302 54,869 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 Korea Imouraren Uranium Investment Corp. 83 — — (13,898 ) 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 ) 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 ) 2021 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won 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. 259,111 236,901 46,034 962 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 ) KOMIPO Europe B.V. 70,431 97 402 (503 ) 2021 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won 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 ) 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 (4) Significant restrictions on abilities to subsidiaries are as follows: Company Nature and extent of 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. The Company’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. The Company’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 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. 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. (5) As of December 31, 2021, the Company has following entitlements in relation to its subsidiaries as per its shareholder’s agreements: Company Nature and extent of significant restrictions KOSPO Youngnam Power Co., Ltd. The Company holds the right to purchase all shares held by the financial investors of KOSPO Youngnam Power Co., Ltd., a subsidiary of the Company, at face value of the issued shares on the 7th and 12th years from the Company’s establishment date. 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. (6) Details of non-controlling 2019 Description KEPCO Ilijan KEPCO Plant KEPCO Construction Others Total In millions of won Percentage of ownership 49.00 % 49.00 % 33.92 % Current assets ￦ 173,931 779,764 257,593 864,596 2,075,884 Non-current 197,446 577,219 477,614 3,169,317 4,421,596 Current liabilities (11,990 ) (247,737 ) (223,522 ) (450,311 ) (933,560 ) Non-current (44,166 ) (47,020 ) (19,472 ) (2,193,501 ) (2,304,159 ) Net assets 315,221 1,062,226 492,213 1,390,101 3,259,761 Book value of non-controlling 154,458 520,491 166,959 551,423 1,393,331 Sales 95,072 1,244,613 448,635 855,023 2,643,343 Profit (loss) for the period 4

Investments in Associates and J

Investments in Associates and Joint Ventures	12 Months Ended
	Dec. 31, 2021
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, 2020 and 2021 are as follows: 2020 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 1,647,325 Korea Electric Power Industrial Development Co., Ltd. Electricity metering and others Korea 29.00 % 4,727 25,630 YTN Co., Ltd. Broadcasting Korea 21.43 % 59,000 40,549 Gangwon Wind Power Co., Ltd.(*2) Power generation Korea 15.00 % 5,725 11,443 Hyundai Green Power Co., Ltd. Power generation Korea 29.00 % 88,885 132,774 Korea Power Exchange(*3) Management of power market and others Korea 100.00 % 127,839 269,122 Taebaek Wind Power Co., Ltd. Power generation Korea 25.00 % 3,810 6,392 Taebaek Guinemi Wind Power Co., Ltd. Power generation Korea 25.00 % 3,420 3,087 Pyeongchang Wind Power Co., Ltd. Power generation Korea 25.00 % 3,875 5,027 Daeryun Power Co., Ltd.(*2) Power generation Korea 9.34 % 40,854 26,353 Changjuk Wind Power Co., Ltd. Power generation Korea 30.00 % 3,801 7,867 KNH Solar Co., Ltd. Power generation Korea 27.00 % 1,296 2,436 SPC Power Corporation Power generation Philippines 38.00 % 20,635 69,912 Gemeng International Energy Co., Ltd. Power generation China 34.00 % 413,153 679,708 PT. Cirebon Electric Power Power generation Indonesia 27.50 % 40,365 117,811 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 27,865 PT. Bayan Resources TBK Resources development Indonesia 20.00 % 615,860 425,234 S-Power Power generation Korea 49.00 % 132,300 110,292 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 generation Laos 25.00 % 87,426 64,570 Hadong Mineral Fiber Co., Ltd.(*2) Recycling fly ashes Korea 8.33 % 50 — PT. Mutiara Jawa Manufacturing and operating floating coal terminal Indonesia 29.00 % 2,978 1,780 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 4,197 Goseong Green Power Co., Ltd.(*2) Power generation Korea 1.12 % 2,900 2,186 Gangneung Eco Power Co., Ltd.(*2) Power generation Korea 1.61 % 2,900 2,368 Shin Pyeongtaek Power Co., Ltd. Power generation Korea 40.00 % 72,000 69,591 Haeng Bok Do Si Photovoltaic Power Co., Ltd. Power generation Korea 28.00 % 194 210 Dongducheon Dream Power Co., Ltd.(*6) Power generation Korea 33.61 % 148,105 80,637 Jinbhuvish Power Generation Pvt. Ltd.(*2, 7) Power generation India 5.16 % 9,000 — Daejung Offshore Wind Power Co., Ltd. Power generation Korea 46.59 % 5,190 2,165 GS Donghae Electric Power Co., Ltd. Power generation Korea 34.00 % 204,000 244,426 Daegu Photovoltaic Co., Ltd. Power generation Korea 29.00 % 1,230 2,066 Busan Green Energy Co., Ltd. Power generation Korea 29.00 % 5,243 8,778 Gunsan Bio Energy Co., Ltd.(*2) Power generation Korea 18.87 % 1,000 — Korea Electric Vehicle Charging Service Electric vehicle charge service Korea 28.00 % 2,800 576 Korea Nuclear Partners Co., Ltd. Electric material agency Korea 28.98 % 537 200 Korea Electric Power Corporation Fund(*8) Developing electric enterprises Korea 98.09 % 51,500 41,926 Energy Infra Asset Management Co., Ltd.(*2) Asset management Korea 9.90 % 297 938 Daegu clean Energy Co., Ltd. Renewable power generation Korea 28.00 % 140 12 Yaksu ESS Co., Ltd. Installing ESS related equipment Korea 29.00 % 210 454 Nepal Water & Energy Development Company Private Limited(*9) Construction and operation of utility plant Nepal 60.35 % 50,268 42,677 Gwangyang Green Energy Co., Ltd. Power generation Korea 20.00 % 2,000 926 PND S Power generation Korea 29.00 % 1,250 1,149 Hyundai Eco Energy Co., Ltd.(*2) Power generation Korea 19.00 % 3,610 4,250 YeongGwang Yaksu Wind Electric Co., Ltd.(*2) Power generation Korea 9.63 % 533 312 Green Energy Electricity Generation Co., Ltd. Power generation Korea 29.00 % 1,189 25 Korea Energy Solutions Co., Ltd. R & D Korea 20.00 % 300 197 ITR Co., Ltd. R & D Korea 20.00 % 50 40 Structure test network Co., Ltd. Technical testing and consulting Korea 20.00 % 25 27 Namjeongsusang Solar Power Operation Co., Ltd.(*10) Power generation Korea 15.00 % 969 103 2020 Investees Key operation activities Location Percentage of Acquisition Book value In millions of won Indeck Niles Development, LLC(*11) Power generation USA 24.08 % ￦ 45,562 20,627 Indeck Niles Asset Management, LLC Power generation USA 33.33 % — 101 Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 Holding company Korea 49.00 % 7,300 7,326 Suwon New Power Co., Ltd. Power generation Korea 39.90 % 798 1,054 KPGE Inc. Power generation materials business Korea 29.00 % 287 287 Gwangbaek Solar Power Investment Co., Ltd. Power generation Korea 44.00 % 4,757 4,682 Go deok Clean Energy Co., Ltd.(*12) Fuel cell generation Korea 61.00 % 1,830 960 SureDataLab Co., Ltd. R & D Korea 23.95 % 126 85 SEP Co., Ltd. R & D Korea 21.26 % 27 14 Hankook Electric Power Information Co., Ltd. R & D Korea 25.25 % 38 139 Tronix Co., Ltd. R & D Korea 20.00 % 75 119 O2&B Global Co., Ltd. R & D Korea 20.00 % 25 22 Muan Sunshine Solar Power Plant Co., Ltd. Power generation Korea 20.00 % 1,570 1,096 Bigeum Resident Photovoltaic Power Co., Ltd. Power generation Korea 29.90 % 1 — Jeju SolarOne Co., Ltd.(*13) Power generation Korea 10.00 % 161 159 Goesan Solar Park Co., Ltd. Power generation Korea 29.00 % 1,276 1,684 Saemangeum Heemang Photovoltaic Co., Ltd. Power generation Korea 35.00 % 11,022 11,022 Bitgoel Eco Energy Co., Ltd. Power generation Korea 29.00 % 29 29 Jeju Gimnyeong Wind Power Co., Ltd. Power generation Korea 30.00 % 714 1,578 Seoroseoro Sunny Power Plant Co., Ltd.(*14) Power generation Korea 19.46 % 230 230 Muan Solar Park Co., Ltd.(*14) Power generation Korea 19.00 % 4,180 4,180 YuDang Solar Co., Ltd. Power generation Korea 20.00 % 360 360 Anjwa Smart Farm & Solar City Co., Ltd.(*14) Power generation Korea 19.50 % 5,510 5,510 Daewon Green Energy Co., Ltd. Power generation Korea 25.36 % 3,910 3,910 2,481,761 4,250,787 <Joint ventures> KEPCO-Uhde Inc.(*15) Power generation Korea 52.80 % 11,355 100 Shuweihat Asia Power Investment B.V. Holding company Netherlands 49.00 % 44,405 13,264 Shuweihat Asia Operation & Maintenance Company(*15) Maintenance of utility plant Cayman 55.00 % 30 1,057 Waterbury Lake Uranium L.P. Resources development Canada 33.10 % 26,602 19,797 ASM-BG Power generation Bulgaria 50.00 % 16,101 18,200 RES Technology AD Power generation Bulgaria 50.00 % 15,595 15,930 KV Holdings, Inc. Power generation Philippines 40.00 % 2,103 2,405 KEPCO SPC Power Corporation(*15) Construction and operation of utility plant Philippines 75.20 % 94,579 201,663 Gansu Datang Yumen Wind Power Co., Ltd. Power generation China 40.00 % 16,621 6,530 Datang Chifeng Renewable Power Co., Ltd. Power generation China 40.00 % 121,928 188,478 Datang KEPCO Chaoyang Renewable Power Co., Ltd. Power generation China 40.00 % 39,872 42,530 Rabigh Electricity Company Power generation Saudi Arabia 40.00 % 109,743 97,157 Rabigh Operation & Maintenance Company Limited Maintenance of utility plant Saudi Arabia 40.00 % 70 3,813 Jamaica Public Service Company Limited Power generation Jamaica 40.00 % 301,910 266,221 KW Nuclear Components Co., Ltd. Manufacturing Korea 45.00 % 833 11,171 Busan Shinho Solar Power Co., Ltd. Power generation Korea 25.00 % 2,100 5,378 Global Trade Of Power System Co., Ltd.(*16) Exporting products and technology of small or medium business by proxy Korea 29.00 % 290 546 Expressway Solar-light Power Generation Co., Ltd.(*16) Power generation Korea 29.00 % 1,856 2,896 Amman Asia Electric Power Company(*15) Power generation Jordan 60.00 % 111,476 161,253 KAPES, Inc.(*15) R & D Korea 51.00 % 5,629 — Honam Wind Power Co., Ltd. Power generation Korea 29.00 % 3,480 3,887 Jeongam Wind Power Co., Ltd. Power generation Korea 40.00 % 5,580 4,620 Korea Power Engineering Service Co., Ltd. Construction and service Korea 29.00 % 290 5,362 Chun-cheon Energy Co., Ltd. Power generation Korea 29.90 % 52,700 27,518 Yeonggwangbaeksu Wind Power Co., Ltd.(*16) Power generation Korea 15.00 % 3,000 3,124 Nghi Son 2 Power LLC Power generation Vietnam 50.00 % 2,781 — Kelar S.A.(*15) Power generation Chile 65.00 % 78,060 71,449 2020 Investees Key operation activities Location Percentage of Acquisition Book value In millions of won PT. Tanjung Power Indonesia Power generation Indonesia 35.00 % ￦ 26,892 33,063 Incheon New Power Co., Ltd.(*17) Power generation Korea 29.00 % 461 — Seokmun Energy Co., Ltd. Power generation Korea 29.00 % 15,370 14,814 Daehan Wind Power PSC Power generation Jordan 50.00 % 7,493 — Barakah One Company(*18) Power generation UAE 18.00 % 118 — Nawah Energy Company(*18) Operation of utility plant UAE 18.00 % 296 270 Momentum International thermonuclear experimental reactor construction management France 33.33 % 1 565 Daegu Green Power Co., Ltd.(*19) Power generation Korea 29.00 % 46,225 23,045 Yeonggwang Wind Power Co., Ltd. Power generation Korea 46.00 % 17,475 17,256 Chester Solar IV SpA Power generation Chile 45.00 % 1,700 1,064 Chester Solar V SpA Power generation Chile 45.00 % 525 277 Diego de Almagro Solar SpA Power generation Chile 45.00 % 2,091 1,490 South Jamaica Power Company Limited Power generation Jamaica 20.00 % 20,521 31,897 Daesan Green Energy Co., Ltd. Power generation Korea 35.00 % 17,850 22,552 RE Holiday Holdings LLC Power generation USA 50.00 % 42,948 68,809 RE Pioneer Holdings LLC Power generation USA 50.00 % 27,891 49,639 RE Barren Ridge 1 Holdings LLC Power generation USA 50.00 % 28,021 4,466 RE Astoria 2 LandCo LLC Power generation USA 50.00 % 5,188 5,230 RE Barren Ridge LandCo LLC Power generation USA 50.00 % 2,187 1,847 Laurel SpA Power generation Chile 45.00 % 1,222 1,092 KIAMCO KOWEPO Bannerton Hold Co Pty Ltd(*16) Power generation Australia 12.37 % 4,095 4,129 Chile Solar JV SpA Power generation Chile 50.00 % 37,689 34,883 Taebaek Gadeoksan Wind Power Co., Ltd. Power generation Korea 47.31 % 12,570 13,362 Cheong-Song Noraesan Wind Power Co., Ltd. Power generation Korea 29.01 % 3,200 3,453 Chester Solar I SpA Power generation Chile 45.00 % 1,181 1,621 Solar Philippines Calatagan Corporation Power generation Philippines 38.00 % 47,903 49,017 Saemangeum Solar Power Co., Ltd.(*20) Power generation Korea 81.00 % 26,399 24,292 Chungsongmeon BongSan wind power Co., Ltd.(*16) Power generation Korea 29.00 % 2,900 4,124 Jaeun Resident Wind Power Plant Co., Ltd.(*16) Power generation Korea 29.00 % 2,494 2,195 DE Energia SpA Power generation Chile 49.00 % 8,364 8,187 Dangjin Eco Power Co., Ltd. Power generation Korea 34.00 % 25,661 25,523 Haemodum Solar Co., Ltd. Power generation Korea 49.00 % 2,940 3,065 Yangyang Wind Power Co., Ltd. Power generation Korea 50.00 % 10,800 10,485 Horus Solar, S.A. De C.V.(*21) Renewable power generation Mexico 14.95 % 5,068 3,394 Recursos Solares PV De Mexico II, S.A. De C.V.(*21) Renewable power generation Mexico 14.95 % 3,678 3,660 Sunmex Renovables, S.A. De C.V.(*21) Renewable power generation Mexico 14.95 % 307 240 Stavro Holding II A.B. Holding company Sweden 20.00 % 8,829 9,277 Solaseado Solar Power Co., Ltd. Power generation Korea 38.90 % 7,020 9,915 Yeongam Solar Power Co., Ltd.(*16) Power generation Korea 19.00 % 6,460 6,042 Samsu Wind Power Co., Ltd.(*16) Power generation Korea 19.00 % 2,637 2,607 Pulau Indah Power Plant Sdn. Bhd. Power generation Malaysia 25.00 % 11,569 11,204 Sam-Yang Power generation Korea 49.00 % 5,245 5,535 NH-Amundi Holding company Korea 29.53 % 20,952 22,242 Shin-han Holding company Korea 90.00 % 15,699 16,129 PT Barito Wahana Tenaga Power generation Indonesia 30.61 % 59,395 63,029 Cheongna Energy Co., Ltd.(*20, 22) Generating and distributing vapor and hot/cold water Korea 50.10 % 49,344 4,940 Naepo Green Energy Co., Ltd.(*23) Power generation Korea 29.20 % 29,200 — Dayone Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.)(*24) Power generation Korea 30.66 % 71,070 — OneEnergy Asia Limited Power generation Vietnam 40.00 % 56,654 56,654 KAS Investment I LLC(*25) Holding company USA 29.89 % 23,437 23,437 KAS Investment II LLC(*25) Holding company USA 29.89 % 23,343 23,343 Energyco LLC Power generation Korea 29.00 % 1,659 1,659 2020 Investees Key operation activities Location Percentage of Acquisition Book value In millions of won CAES, LLC Holding company USA 36.00 % ￦ 19,414 17,626 Hapcheon Floating Photovoltaic Power Plant Inc.(*16) Power generation Korea 19.47 % 1,890 1,890 Busan Industrial Solar Power Co., Ltd. Power generation Korea 28.02 % 510 510 Bitsolar Energy Co., Ltd. Power generation Korea 27.10 % 352 352 1,943,392 1,919,746 ￦ 4,425,153 6,170,533 (*1) The effective percentage of ownership is 22.02% considering treasury stocks. (*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 Company recognized a full impairment loss for the carrying amount of Jinbhuvish Power Generation Pvt. Ltd. before the prior year, due to the Company’s decision to withdraw its business since there are no business activities occurring. (*8) 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. (*9) 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. (*10) 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. (*11) According to the shareholders’ agreement, additional investment of 50% of total stake is agreed by March 2022. (*12) Even though the effective percentage of ownership is more than 50%, the Company does not hold control over the entity as it has less than 50% of decision-making rights. However the Company can exercise significant influence on the entity by participating in the board of directors and others.Therefore the entity is classified as an associate. (*13) It was newly invested during the year ended December 31, 2020. The effective percentage of ownership is less than 20%. However, it is classified as an associate, judging that the Company can exercise significant influence on the entity. (*14) The entities were newly invested during the year ended December 31, 2020. The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint a director to the board of directors of the entity. (*15) 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. (*16) According to the shareholders’ agreement, the parties have joint control over all decisions related to financial and operation. Accordingly, the entity is classified as joint ventures. (*17) 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. (*18) The effective percentage of ownership is less than 20%. However, all operation related decisions must be agreed by ownership parties. Accordingly, the entity is classified as joint ventures. (*19) Although the nominal percentage of ownership is 29.00%, the effective percentage of ownership is 54.24%, considering the interest of financial investors as a liability component. (*20) The effective percentage of ownership is more than 50%. However, all operation related decisions must be agreed by all ownership parties. Accordingly, the entity is classified as a joint venture. (*21) 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. (*22) The classification of the entity was changed from an associate to a joint venture, due to the additional investment during the year ended December 31, 2020. (*23) The percentage of ownership decreased due to the unequal capital increase. The entity was reclassified from an associate to a joint venture, due to the changes in voting rights. (*24) The name of the entity has changed during the current year. According to the Dayone Energy Co., Ltd. (formerly, Hyundai 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. (formerly, Hyundai 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. (*25) The entities were included in the joint ventures due to the new investment during the year ended December 31, 2020. Since the final settlement of the entity was not completed before the Company’s financial statements date, the financial statements of October 7, were used for consolidation. 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 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 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. (formerly, Korea Nuclear Partners 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 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 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 2021 Investees Key operation activities Location Percentage of Acquisition Book value In millions of won 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 P 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 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 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 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 2021 Investees Key operation activities Location Percentage of Acquisition Book value In millions of won 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 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 Power generation Korea 49.00 % 5,245 4,993 NH-Amundi Holding company Korea 29.53 % 19,983 21,456 Shin-han Holding company Korea 90.00 % 15,699 16,288 2021 Investees Key operation activities Location Percentage of Acquisition Book value In millions of won 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 gene

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2021
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, 2020 and 2021 are as follows: 2020 Acquisition cost Government grants Accumulated depreciation Accumulated losses Book value In millions of won Land ￦ 13,970,098 (23,475 ) — (26,772 ) 13,919,851 Buildings 21,773,824 (57,231 ) (9,150,218 ) (7,074 ) 12,559,301 Structures 74,136,523 (180,009 ) (27,864,461 ) (13,207 ) 46,078,846 Machinery 94,295,027 (157,785 ) (43,740,838 ) (515,402 ) 49,881,002 Ships 2,482 — (2,227 ) — 255 Vehicles 338,386 (632 ) (259,288 ) (115 ) 78,351 Equipment 1,895,528 (227 ) (1,487,643 ) (42 ) 407,616 Tools 1,195,721 (239 ) (1,003,295 ) (39 ) 192,148 Construction-in-progress 31,121,255 (79,126 ) — (157,530 ) 30,884,599 Right-of-use 7,905,214 — (3,363,048 ) — 4,542,166 Asset retirement costs 12,260,732 — (4,701,138 ) (146,423 ) 7,413,171 Others 13,979,980 — (11,227,899 ) — 2,752,081 ￦ 272,874,770 (498,724 ) (102,800,055 ) (866,604 ) 168,709,387 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 22,973,395 (52,122 ) (10,041,270 ) (7,073 ) 12,872,930 Structures 78,473,094 (172,021 ) (30,171,363 ) (13,205 ) 48,116,505 Machinery 101,049,793 (140,082 ) (48,791,577 ) (514,991 ) 51,603,143 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 ￦ 287,613,240 (501,409 ) (113,125,144 ) (866,906 ) 173,119,781 (2) Changes in property, plant and equipment for the years ended December 31, 2021 and 2020 are as follows: 2020 Beginning Acquisition Disposal Depreciation Impairment Others Ending balance In millions of won Land ￦ 13,848,063 5,330 (31,304 ) (273 ) — 121,510 13,943,326 (Government grants) (21,817 ) — 2 — — (1,660 ) (23,475 ) Buildings 12,445,706 7,225 (16,015 ) (875,680 ) (2,107 ) 1,057,403 12,616,532 (Government grants) (61,920 ) — — 5,206 — (517 ) (57,231 ) Structures 45,178,870 36,091 (346,612 ) (2,313,920 ) (3,571 ) 3,707,997 46,258,855 (Government grants) (186,554 ) — 2,032 9,526 — (5,013 ) (180,009 ) Machinery 49,907,300 407,521 (283,845 ) (5,526,816 ) (74,362 ) 5,608,989 50,038,787 (Government grants) (158,907 ) — 496 17,468 — (16,842 ) (157,785 ) Ships 201 — — (106 ) — 160 255 Vehicles 70,585 3,880 (151 ) (35,036 ) — 39,705 78,983 (Government grants) (2,275 ) — 4 2,064 — (425 ) (632 ) Equipment 374,115 72,655 (86 ) (186,004 ) — 147,163 407,843 (Government grants) (241 ) — — 149 — (135 ) (227 ) Tools 164,064 28,048 (193 ) (82,862 ) — 83,330 192,387 (Government grants) (403 ) — — 243 — (79 ) (239 ) Construction-in-progress 28,419,470 12,726,469 (486 ) — 7,799 (10,189,527 ) 30,963,725 (Government grants) (61,211 ) 8,783 — — — (26,698 ) (79,126 ) Right-of-use 4,783,573 291,334 (827 ) (586,254 ) — 54,340 4,542,166 Asset retirement costs 7,374,527 131 (196 ) (819,708 ) — 858,417 7,413,171 Others 2,628,681 6,470 (8,145 ) (984,097 ) (366 ) 1,109,538 2,752,081 ￦ 164,701,827 13,593,937 (685,326 ) (11,376,100 ) (72,607 ) 2,547,656 168,709,387 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 ) — 1,208,997 12,925,052 (Government grants) (57,231 ) — — 5,174 — (65 ) (52,122 ) Structures 46,258,855 (5,472 ) (319,287 ) (2,582,488 ) (741 ) 4,937,659 48,288,526 (Government grants) (180,009 ) — 1,811 9,517 — (3,340 ) (172,021 ) Machinery 50,038,787 268,126 (135,803 ) (5,759,155 ) — 7,331,270 51,743,225 (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 30,963,725 12,165,238 (66,965 ) — (3,315 ) (12,902,589 ) 30,156,094 (Government grants) (79,126 ) 5,027 — — — (37,723 ) (111,822 ) Right-of-use 4,542,166 78,213 (11,787 ) (554,615 ) — 5,420 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 ￦ 168,709,387 12,614,177 (613,515 ) (11,770,725 ) (4,056 ) 4,184,513 173,119,781

Investment Properties

Investment Properties	12 Months Ended
	Dec. 31, 2021
Disclosure of detailed information about investment property [abstract]
Investment Properties	19. Investment Properties (1) Investment properties as of December 31, 2020 and 2021 are as follows: 2020 Acquisition Government Accumulated Book value In millions of won Land ￦ 200,391 — — 200,391 Buildings 59,347 (29 ) (34,514 ) 24,804 ￦ 259,738 (29 ) (34,514 ) 225,195 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 (2) Changes in investment properties for the years ended December 31, 2020 and 2021 are as follows: 2020 Beginning Depreciation Others Ending In millions of won Land ￦ 129,897 — 70,494 200,391 Buildings 28,696 (1,454 ) (2,409 ) 24,833 (Government grants) (13 ) 1 (17 ) (29 ) ￦ 158,580 (1,453 ) 68,068 225,195 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 (3) Income and expenses related to investment properties for the years ended December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Rental income ￦ 8,335 10,118 Operating and maintenance expenses related to rental income (1,453 ) (1,386 ) ￦ 6,882 8,732 (4) Fair value of investment properties as of December 31, 2020 and 2021 are as follows: 2020 2021 Book value Fair value Book value Fair value In millions of won Land ￦ 200,391 300,001 201,605 268,702 Buildings 24,804 44,597 11,179 13,636 ￦ 225,195 344,598 212,784 282,338 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 Services Contracts

Construction Services Contracts	12 Months Ended
	Dec. 31, 2021
Construction Services Contracts [Abstract]
Construction Services Contracts [Text Block]	20. Construction Contracts (1) Changes in total contract amount in which revenue is not yet recognized for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 Beginning balance Increase Recognized as revenue Ending In millions of won Nuclear power plant construction in UAE and others ￦ 3,620,788 379,269 (1,264,916 ) 2,735,141 (*) For the year ended December 31, 2019, the increased balance of contracts from new orders is ￦390,224 million and the decreased balance of contracts due to changes in scope of construction work and foreign exchange impact is ￦10,955 million. 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. (2) Accumulated earned revenue, expense and others related to the Company’s construction contracts in progress as of December 31, 2020 and 2021 are as follows: 2020 Accumulated earned revenue Accumulated expense Accumulated profit Unearned advance receipts In millions of won Nuclear power plant construction in UAE and others ￦ 21,460,431 20,242,735 1,217,696 97,348 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 (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, 2020 and 2021 are as follows: 2020 2021 Contract Contract Contract Contract In millions of won Nuclear power plant construction in UAE and others ￦ 79,662 88,126 82,306 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 ￦39,063 million and ￦57,639 million, as of December 31, 2020 and 2021, respectively. (*2) Included in non-financial Revenue recognized for the year ended December 31, 2021 from performance obligations satisfied in previous periods is (-) ￦6,480 million.

Intangible Assets other than Go

Intangible Assets other than Goodwill	12 Months Ended
	Dec. 31, 2021
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, 2020 and 2021 are as follows: 2020 Acquisition Government Accumulated Accumulated Book value In millions of won Software ￦ 775,667 (136 ) (623,504 ) — 152,027 Licenses and franchises 547 — (547 ) — — Copyrights, patents rights and other industrial rights 101,866 — (49,772 ) (9,178 ) 42,916 Mining rights 604,703 — (34,062 ) (528,251 ) 42,390 Development expenditures 958,035 (5,043 ) (862,850 ) (19 ) 90,123 Intangible assets under development 79,862 (7,203 ) — (12,844 ) 59,815 Usage rights of donated assets and other 592,930 — (408,455 ) — 184,475 Leasehold rights 27,843 — (21,503 ) — 6,340 Greenhouse gas emissions rights 61,373 — — — 61,373 Others 566,200 (75 ) (137,843 ) (12,011 ) 416,271 ￦ 3,769,026 (12,457 ) (2,138,536 ) (562,303 ) 1,055,730 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 (2) Changes in intangible assets for the years ended December 31, 2020 and 2021 are as follows: 2020 Beginning Acquisition Disposal Amortization Impairment Others Ending In millions of won Software ￦ 164,995 14,101 — (77,501 ) — 50,568 152,163 (Government grants) (235 ) — — 99 — — (136 ) Copyrights, patents rights and other industrial rights 53,261 369 (390 ) (8,352 ) — (1,972 ) 42,916 Mining rights 43,723 1,664 — (4,380 ) — 1,383 42,390 Development expenditures 93,843 10,273 — (32,034 ) — 23,084 95,166 (Government grants) (1,492 ) — — 1,453 — (5,004 ) (5,043 ) Intangible assets under development 60,490 53,638 — — (23 ) (47,087 ) 67,018 (Government grants) (11,029 ) — — — — 3,826 (7,203 ) Usage rights of donated assets and other 193,161 — — (18,448 ) — 9,762 184,475 Leasehold rights 5,318 — — (831 ) — 1,853 6,340 Greenhouse gas emissions rights 41,656 37,109 (9,271 ) — — (8,121 ) 61,373 Others 426,364 3,217 (46 ) (30,476 ) (3,576 ) 20,863 416,346 (Government grants) (79 ) — — 4 — — (75 ) ￦ 1,069,976 120,371 (9,707 ) (170,466 ) (3,599 ) 49,155 1,055,730 2021 Beginning Acquisition Disposal Amortization Impairment 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 (3) Significant specific intangible assets as of December 31, 2020 and 2021 are as follows: 2020 Type Description Currency Amount Remaining useful lives In millions of won and thousands of Australian dollars Software ERP system and others KRW 81 2 months ~ 4 months Copyrights, patents rights and other industrial rights Smart technology verification and standard design project conducting right KRW 4,936 1 year and 9 months Contributions to ARP NRC DC KRW 29,219 7 years Mining rights Mining rights of Bylong mine AUD — — (*) Development expenditures Electricity sales information system KRW 8,229 1 year and 2 months Usage rights of donated assets and others Sejong Haengbogdosi sharing charge KRW 26,847 5 years and 11 months Dangjin power plant load facility usage right KRW 1,574 3 months Right of use electricity and gas supply facility (Community district of Songdo) KRW 10,016 9 years and 6 months Others Occupancy and use of public waters KRW 87,035 16 years and 1 month Greenhouse gas emissions rights KRW 61,373 — Business rights KRW 166,207 28 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. 2021 Type Description Currency Amount Remaining useful lives In millions of won and thousands of Australian dollars Software DAS MS-SQL CORE license 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 ARP NRC DC 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. (4) For the years ended December 31, 2019, 2020 and 2021, the Company recognized research and development expenses of 735,715 million, 700,642 million and 689,397 million, respectively.

Trade and Other Payables

Trade and Other Payables	12 Months Ended
	Dec. 31, 2021
Trade and other payables [abstract]
Trade and Other Payables	22. Trade and Other Payables Trade and other payables as of December 31, 2020 and 2021 are as follows: 2020 2021 Current Non-current Current Non-current In millions of won Trade payables ￦ 2,606,861 — 4,780,260 — Non-trade payables 1,785,068 2,324,965 1,536,976 2,032,260 Accrued expenses 1,197,815 2,038 1,174,765 8,095 Leasehold deposits received 2,336 943 1,699 741 Other deposits received 83,505 67,645 72,063 68,050 Lease liabilities 576,665 4,044,431 583,558 3,826,945 Dividends payable 4,271 — 4,105 — Others(*) — 40,390 — 60,407 ￦ 6,256,521 6,480,412 8,153,426 5,996,498 (*) Details of others as of December 31, 2020 and 2021 are as follows: 2020 2021 Current Non-current Current Non-current In millions of won Advance received from local governments ￦ — 4,278 — 3,477 Others — 36,112 — 56,930 ￦ — 40,390 — 60,407

Borrowings and Debt Securities

Borrowings and Debt Securities	12 Months Ended
	Dec. 31, 2021
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, 2020 and 2021 are as follows: 2020 2021 In millions of won Current liabilities Short-term borrowings ￦ 1,436,922 2,920,563 Current portion of long-term borrowings 677,982 1,463,703 Current portion of debt securities 8,565,301 9,652,986 Less : Current portion of discount on long-term borrowings (1,723 ) (2,048 ) Less : Current portion of discount on debt securities (3,677 ) (5,370 ) 10,674,805 14,029,834 Non-current liabilities Long-term borrowings 3,018,898 2,278,481 Debt securities 56,188,234 64,385,784 Less : Discount on long-term borrowings (14,899 ) (12,857 ) Less : Discount on debt securities (143,823 ) (152,760 ) Add: Premium on debt securities 1,366 1,031 59,049,776 66,499,679 ￦ 69,724,581 80,529,513 (2) Repayment schedule of borrowings and debt securities as of December 31, 2020 and 2021 are as follows: 2020 Borrowings Debt Securities In millions of won Less than 1 year ￦ 2,114,904 8,565,301 1~ 5 years 1,564,252 28,746,117 Over 5 years 1,454,646 27,442,117 ￦ 5,133,802 64,753,535 2021 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 (3) Short-term borrowings as of December 31, 2020 and 2021 are as follows: 2020 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 0.80 ~ 4.60 2021.01.05 ~2021.12.31 — ￦ 580,004 Electronic short-term bonds KB Securities and others 0.75 ~ 1.35 2021.01.13 ~2021.03.18 — 470,000 Foreign short-term borrowings Shinhan Bank 0.71 ~ 0.74 2021.01.04 ~2021.03.31 USD 55,393 60,268 Foreign short-term borrowings(*) Korea Development Bank and others 1M Libor + 1.25 2022.04.29 USD 73,704 81,290 Local bank overdraft Woori Bank Standard 2021.02.26 — 29,960 Local bank overdraft Korea Development Bank and others 1.42 ~ 1.88 2021.01.07~ 2021.04.26 — 215,400 ￦ 1,436,922 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 ~ — ￦ 2,030,886 Electronic short-term bonds BNK Securities and others 1.35~1.77 2022.01.21 ~ — 100,000 Foreign short-term borrowings Shinhan Bank and others 0.34~0.45 2022.01.04 ~ 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 ~ 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 ~ — 208,018 ￦ 2,920,563 (*) The contractual maturity is 2022 but is classified as short-term borrowing due to intention of early redemption in 3 months after borrowing. (4) Long-term borrowings as of December 31, 2020 and 2021 are as follows: 2020 Type Interest rate (%) Maturity Foreign currency Local In millions of won and thousands of foreign currencies Local long-term borrowings Korea Development Bank Others 0.50 2021~2044 — ￦ 2,946 Facility 2.50~4.60 2021~2028 — 50,293 Operating funds 2.33 2022 — 20,000 Operating funds 1yr KoFC bond rate +0.81~0.95 2022~2023 — 24,300 Hana Bank Commercial Paper 3M CD+0.13~0.32 2021~2024 — 1,150,000 Facility 4.60 2028 — 11,088 Facility 3yr KTB rate-1.25 Standard overdraft rate+1.50~2.45 2021~2035 — 43,419 IBK PF Refinancing CD+1.25 2030 — 9,543 Export-Import Bank of Korea Project loans 1.50 2026 — 16,204 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 — 2,509 Facility 3yr KTB rate-2.25 2021~2024 — 1,527 Project loans — 2023 — 1,197 Others KTB rate-2.25 2024~2028 — 14,045 Shinhan Bank Facility CB rate+1.10 2028 — 16,632 Others 3.95 2034 — 89,257 Others Standard overdraft rate+1.00 2034 — 89,257 Kookmin Bank Facility MOR+0.79 3M CD+1.79 2021~2031 — 46,512 Others Facility 1.75~6.80 2026~2037 — 510,262 Facility CB rate+1.10~1.20 3M CD+1.60 Standard overdraft rate+1.50~2.45 2023~2037 — 89,506 PF Refinancing 4.10 2030 — 26,509 Others 3.90~7.90 2023~2039 — 222,356 2,485,062 Foreign long-term borrowings Korea Energy Agency Project loans — 2021~2023 USD 8,744 9,513 Export-Import Bank of Korea and others Direct loan and others 1M Libor+1.80~3.20 2036 USD 96,014 104,463 Direct loan and others 3M LIBOR+2.75~3.70 2027 JOD 132,228 202,912 PF Loan 6M LIBOR+1.70~2.50 2032 USD 111,225 121,013 Others 3.88 2021 USD 289,509 314,986 POSCO and others Shareholder’s loan 8.00 2023 USD 14,061 15,298 Shareholder’s loan 8.00 2031 JOD 4,853 7,447 Samsung Life Insurance and others Syndicated Loans 3.10 2032 JPY 4,682,816 49,369 Woori Bank and others Syndicated Loans JPY 6M Libor+2.00 2032 JPY 3,020,746 31,847 IFC and others Others 6M Libor+5.00 2031 USD 224,115 243,837 Federal Financing Bank and others PF Loans 2.39~6.00 2031~2038 USD 97,347 105,913 Others Others — — USD 4,798 5,220 1,211,818 3,696,880 Less: Discount on long-term borrowings (16,622 ) Less: Current portion of long-term borrowings (677,982 ) Add: Current portion of discount on long-term borrowings 1,723 ￦ 3,003,999 2021 Type Interest rate (%) Maturity Foreign currency Local 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 KoFC 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 Loans 3.10~8.00 2032 JPY 5,144,387 53,000 Woori Bank and others Syndicated Loans 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 Loans 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 (5) Local debt securities as of December 31, 2020 and 2021 are as follows: Issue date Maturity Interest 2020 2021 In millions of won Electricity Bonds 2012.01.15~ 2021.12.23 2022.01.05~ 2049.10.24 1.02~4.20 ￦ 27,810,000 34,080,000 Corporate Bonds(*) 2009.10.16~ 2021.11.22 2022.01.19~ 2051.11.22 0.86~6.00 26,463,577 28,194,472 54,273,577 62,274,472 Less: Discount on local debt securities (46,730 ) (52,723 ) Less: Current portion of local debt securities (7,243,217 ) (7,432,647 ) Add: Current portion of discount on local debt securities 2,108 2,510 ￦ 46,985,738 54,791,612 (*) Among the corporate bonds, each holder of Hee Mang Sunlight rights bonds (6) Foreign debt securities as of December 31, 2020 and 2021 are as follows: 2020 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 ￦ 303,227 FY-97 1997.01.31~ 1997.08.04 2027.02.01~ 2027.08.01 6.75~7.00 USD 314,717 342,412 FY-04 2004.04.23 2034.04.23 5.13 USD 286,920 312,169 FY-11 2011.07.13 2021.07.13 4.75 USD 500,000 544,000 FY-12 2012.09.19 2022.09.19 3.00 USD 750,000 816,000 FY-14 2014.07.30 2029.07.30 3.57 USD 100,000 108,800 FY-15 2015.06.15 2025.06.15 3.25 USD 300,000 326,400 FY-16 2016.01.21 2021.07.21 2.50 USD 300,000 326,400 FY-17 2017.06.19~ 2017.07.25 2022.06.19~ 2027.07.25 2.63~3.13 USD 800,000 870,400 FY-17 2017.10.30 2037.10.30 1.70 EUR 40,000 53,530 FY-17 2017.11.16 2037.11.16 2.36 SEK 450,000 59,747 FY-18 2018.01.29~ 2018.07.25 2021.01.29~ 2023.07.25 3.00~3.88 USD 1,800,000 1,958,400 FY-18 2018.03.13 2028.03.13 3.35 HKD 1,650,000 231,578 FY-19 2019.01.22~ 2019.06.24 2022.01.22~ 2024.06.24 2.50~3.38 USD 800,000 870,400 FY-19 2019.02.27 2024.02.27 0.13 CHF 200,000 246,866 FY-19 2019.07.19 2024.07.19~ 2027.07.19 0.00~0.05 CHF 300,000 370,299 FY-19 2019.07.22 2022.07.22 2.38 USD 300,000 326,400 FY-19 2019.10.30 2024.10.30 3M BBSW+0.97 AUD 300,000 250,968 FY-19 2019.12.19 2037.12.31 3.30~5.70 USD 387,098 421,163 FY-20 2020.02.03 2025.02.03 2.13 USD 300,000 326,400 FY-20 2020.06.15 2025.06.15 1.13 USD 500,000 544,000 FY-20 2020.05.06 2025.05.06 1.75 USD 500,000 544,000 FY-20 2020.08.03 2026.02.03 0.61 USD 300,000 326,399 10,479,958 Less : Discount on foreign debt securities (100,770 ) Add : Premium on foreign debt securities 1,366 Less : Current portion of foreign debt securities (1,322,084 ) Add : Current portion of discount on foreign debt securities 1,569 ￦ 9,060,039 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~ 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 (7) Changes in borrowings and debt securities for the years ended December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Beginning balance ￦ 67,876,541 69,724,581 Cash flow 2,538,787 9,653,394 Effect of exchange rate fluctuations (640,304 ) 1,001,493 Others (50,443 ) 150,045 Ending balance ￦ 69,724,581 80,529,513

Lease

Lease	12 Months Ended
	Dec. 31, 2021
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 ￦45,787 million and ￦199,490 million respectively, as expense for the years ended December 31, 2020 and 2021. The Company also applies the leases of low-value assets recognition exemption to leases contracts with underlying assets considered to be of (2) Right-of-use assets as of December 31, 2020 and 2021 are as follows: 2020 Acquisition cost Accumulated depreciation Book value In millions of won Land ￦ 811,014 (104,435 ) 706,579 Buildings 82,749 (35,527 ) 47,222 Structures 24,175 (3,689 ) 20,486 Machinery 1,308 (613 ) 695 Ships 4,280,331 (842,968 ) 3,437,363 Vehicles 29,281 (15,756 ) 13,525 Others(*) 2,676,356 (2,360,060 ) 316,296 ￦ 7,905,214 (3,363,048 ) 4,542,166 (*) Including power purchase agreements (“PPA”) with GS EPS and another LNG combined power supplier. 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. (3) Changes in right-of-use assets for the years ended December 31, 2020 and 2021 are as follows: 2020 Beginning Increase Depreciation Decrease Others Ending In millions of won Land ￦ 644,074 12,269 (52,069 ) — 102,305 706,579 Buildings 34,577 53,182 (37,609 ) (803 ) (2,125 ) 47,222 Structures 25,644 260 (1,485 ) — (3,933 ) 20,486 Machinery 824 — (129 ) — — 695 Ships 3,688,289 183,789 (427,221 ) — (7,494 ) 3,437,363 Vehicles 13,708 9,009 (7,747 ) (21 ) (1,424 ) 13,525 Others 376,457 32,825 (59,994 ) (3 ) (32,989 ) 316,296 ￦ 4,783,573 291,334 (586,254 ) (827 ) 54,340 4,542,166 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 (50,485 ) (10,311 ) (3,422 ) 279,168 ￦ 4,542,166 78,213 (554,615 ) (11,787 ) 5,420 4,059,397 (4) Lease liabilities as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Less than 1 year ￦ 614,442 620,121 1 ~ 5 years 2,133,538 2,158,145 More than 5 years 2,461,557 2,150,722 5,209,537 4,928,988 Less : Discount (588,441 ) (518,485 ) Present value of lease payment ￦ 4,621,096 4,410,503 (5) The details of the liquidity classification of lease liabilities as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Current lease liabilities ￦ 576,665 583,558 Non-current lease liabilities 4,044,431 3,826,945 ￦ 4,621,096 4,410,503 (6) Changes in lease liabilities for the years ended December 31, 2020 and 2021 are as follows: 2020 Beginning Increase Decrease Interest Others(*) Ending In millions of won Lease liabilities ￦ 5,070,133 280,114 (725,759 ) 111,782 (115,174 ) 4,621,096 (*) Including translation effect of foreign currency lease liabilities and others. 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 (*) Including translation effect of foreign currency lease liabilities and others. (7) Details of expense relating to lease contracts as lessee for the years 2020 2021 In millions of won Depreciation of right-of-use assets ￦ 586,254 554,615 Interest expenses of lease liabilities 111,782 93,651 Leases expenses for short-term leases 45,787 199,490 Leases expenses for leases of low-value assets 2,796 2,349 Variable lease payments 33,267 54,675 ￦ 779,886 904,780 (8) The total cash outflow related to the lease contracts, including cash outflows due to short-term leases and leases of low-value assets 807,609 million and 922,200 million, for the years ended December 31, 2020 and 2021, 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 Wind Power Plant conduits (2) Profit and loss related to finance lease for the years ended December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Finance income on the net investment in the lease ￦ 117,763 111,569 (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, 2020 and 2021 are as follows: 2020 2021 In millions of won Less than 1 year ￦ 162,211 172,528 1 ~ 2 years 148,485 163,937 2 ~ 3 years 144,913 158,933 3 ~ 4 years 139,605 156,450 4 ~ 5 years 136,962 155,068 More than 5 years 1,583,576 1,588,403 2,315,752 2,395,319 Less : Unearned finance income (1,192,686 ) (1,194,627 ) Net investment in the lease(*) ￦ 1,123,066 1,200,692 (*) Including the present value of unguaranteed residual value amounting to ￦16,407 million and ￦19,574 million, as of December 31, 2020 and 2021, 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 16.83% per year as of December 31, 2021. (prior year : 1.39% ~ 16.60%) (4) Changes in the allowance for doubtful accounts of finance lease receivables for the years ended December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Beginning balance ￦ 862 990 Bad debt expense 128 — Reversal of allowance for doubtful accounts — (222 ) Ending balance ￦ 990 768

Employment Benefits

Employment Benefits	12 Months Ended
	Dec. 31, 2021
Disclosure of information about defined benefit plans [abstract]
Employment Benefits	25. Employment Benefits (1) Employment benefit obligations as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Net defined benefit asset ￦ 7,231 20,871 Net defined benefit obligations 1,907,013 1,675,741 Other long-term employee benefit obligations 3,847 3,417 (2) Principal assumptions used for 2020 2021 Discount rate 1.87%~2.12% 2.51% ~ 2.60% Future salary and benefit levels 4.28% 4.28% Weighted average duration 10.77 years 10.39 years (3) Details of expense relating to defined benefit plans for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Current service cost ￦ 440,300 509,520 524,942 Interest cost 83,619 83,248 91,877 Expected return on plan assets (41,597 ) (42,742 ) (52,782 ) Past service cost 301,442 (2,027 ) 5,483 Loss from settlement (2,017 ) — — ￦ 781,747 547,999 569,520 Expenses described above are recognized in those items below in the consolidated financial statements. 2019 2020 2021 In millions of won Cost of sales ￦ 580,623 397,442 415,959 Selling and administrative expenses 120,455 94,846 95,983 Others (Construction-in-progress and others) 80,669 55,711 57,578 ￦ 781,747 547,999 569,520 In addition, for the years ended December 31, 2019, 2020 and 2021, employee benefit obligations expenses of ￦71,844 million, ￦60,587 million and ￦71,875 million, respectively, are recognized as cost of sales, and ￦12,775 million, ￦9,121 million and ￦17,144 million, respectively, are recognized as selling and administrative expenses, and ￦13,893 million, ￦11,861 million and ￦13,126 million, respectively, are recognized as construction-in-progress and others, relates to the Company’s defined contribution plans. (4) Details of defined benefit obligations as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Present value of defined benefit obligation from funded plans ￦ 4,570,614 4,564,417 Fair value of plan assets (2,670,832 ) (2,909,547 ) Net liabilities incurred from defined benefit plans ￦ 1,899,782 1,654,870 (5) Changes in the present value of defined benefit obligations for the years ended December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Beginning balance ￦ 4,035,400 4,570,614 Current service cost 509,520 524,942 Interest cost 83,248 91,877 Remeasurement component 84,385 (345,755 ) Past service cost (2,027 ) 5,483 Actual payments (139,956 ) (282,794 ) Others 44 50 Ending balance ￦ 4,570,614 4,564,417 (6) Changes in the fair value of plan assets for the years ended December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Beginning balance ￦ 2,111,313 2,670,832 Expected return 42,742 52,782 Remeasurement component (390 ) (8,457 ) Contributions by the employers 582,275 317,707 Actual payments (65,108 ) (123,317 ) Ending balance ￦ 2,670,832 2,909,547 In addition, loss on accumulated remeasurement component amounting to ￦169,234 million and gain on accumulated remeasurement component amounting to ￦98,844 million have been recognized as other comprehensive income or loss for the years ended December 31, 2020 and 2021, respectively. (7) Details of the fair value of plan assets as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Equity instruments ￦ 253,358 344,002 Debt instruments 822,582 744,167 Bank deposits 284,655 407,809 Others 1,310,237 1,413,569 ￦ 2,670,832 2,909,547 For the years ended December 31, 2020 and 2021, actual returns on plan assets amounted to ￦42,352 million and ￦44,325 million, respectively. (8) Remeasurement components 2020 2021 In millions of won Actuarial gain from changes in financial assumptions ￦ (2,979 ) (258,194 ) Experience adjustments, etc. 87,364 (87,561 ) Expected return 390 8,457 ￦ 84,775 (337,298 ) Remeasurement components are

Provisions

Provisions	12 Months Ended
	Dec. 31, 2021
Disclosure of other provisions [abstract]
Provisions	26. Provisions (1) Provisions as of December 31, 2020 and 2021 are as follows: 2020 2021 Current Non-current Current Non-current In millions of won Employment benefits Provisions for employment benefits ￦ 1,024,574 — 1,048,939 — Litigation Litigation provisions 46,287 66,715 26,269 88,449 Decommissioning cost Nuclear plants — 16,974,884 — 19,461,461 Spent fuel 487,529 866,472 457,466 893,196 Radioactive waste 46,369 1,845,244 137,342 1,695,193 PCBs — 119,019 — 103,665 Other recovery provisions — 25,840 — 30,231 Others Power plant regional support program 144,272 — 146,588 — Transmission regional support program 96,895 — 250,288 — Provisions for financial guarantee 22,250 44,104 21,032 59,809 Provisions for RPS 9,126 — — — Provisions for greenhouse gas emissions obligations 393,121 — 655,544 — Others 181,241 133,294 102,408 169,420 ￦ 2,451,664 20,075,572 2,845,876 22,501,424 (2) Changes in provisions for the years ended December 31, 2020 and 2021 are as follows: 2020 Beginning Increase in Payment Reversal Others Ending balance In millions of won Employment benefits Provisions for employment benefits ￦ 975,619 1,078,382 (1,028,218 ) — (1,209 ) 1,024,574 Litigation Litigation provisions 88,398 81,990 (34,662 ) (22,724 ) — 113,002 Decommissioning cost Nuclear plants 15,994,039 1,028,580 (47,735 ) — — 16,974,884 Spent fuel 1,355,280 394,642 (395,921 ) — — 1,354,001 Radioactive waste 1,888,082 71,529 (67,998 ) — — 1,891,613 PCBs 152,981 3,017 (14,839 ) (22,140 ) — 119,019 Other recovery provisions 10,773 15,280 — — (213 ) 25,840 Others Power plant regional support program 140,133 39,445 (42,935 ) — 7,629 144,272 Transmission regional support program 139,785 151,796 (194,686 ) — — 96,895 Provisions for tax — — (24 ) 25 (1 ) — Provisions for financial guarantee 81,357 11,303 (20,962 ) (5,317 ) (27 ) 66,354 Provisions for RPS 2,889 494,199 (487,962 ) — — 9,126 Provisions for greenhouse gas emissions obligations 682,459 331,684 (633,482 ) 65,389 (52,929 ) 393,121 Others 158,974 210,051 (48,919 ) (4,593 ) (978 ) 314,535 ￦ 21,670,769 3,911,898 (3,018,343 ) 10,640 (47,728 ) 22,527,236 2021 Beginning Increase 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 program 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 emissions obligations 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 (3) Greenhouse gas emissions rights and obligations: (i) Allowances received free of charge from the government for each planned period as of December 31, 2021 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 15,625 15,782 15,782 5,261 5,261 57,711 (ii) Changes in greenhouse gas emissions rights for the years ended December 31, 2021 and 2020 are as follows: 2020 2nd planned period Quantity Amount In ten thousands of Beginning 17,276 18,306 Purchase (sell) 723 270,338 Government submission — — Borrowing (carryforward) (94 ) 68,711 Ending 17,905 357,355 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 of tons(tCO2-eq) and millions of won 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 (iii) The Company does not have greenhouse gas emissions rights pledged as collateral as of December 31, 2021. (iv) The Company does not hold any greenhouse gas emissions rights for a purpose of fluctuations (v) Estimated greenhouse

Government Grants

Government Grants	12 Months Ended
	Dec. 31, 2021
Government grants [Abstract]
Government Grants	27. Government Grants (1) Government grants as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Land ￦ (23,475 ) (23,474 ) Buildings (57,231 ) (52,122 ) Structures (180,009 ) (172,021 ) Machinery (157,785 ) (140,082 ) Vehicles (632 ) (1,675 ) Equipment (227 ) (149 ) Tools (239 ) (64 ) Construction-in-progress (79,126 ) (111,822 ) Investment properties (29 ) (30 ) Software (136 ) (91 ) Development expenditures (5,043 ) (3,820 ) Intangible assets under development (7,203 ) (7,326 ) Other intangible assets (75 ) (71 ) ￦ (511,210 ) (512,747 ) (2) Changes in government grants for the years ended December 31, 2020 and 2021 are as follows: 2020 Beginning Receipt Acquisition Offset the Disposal Others Ending In millions of won Cash ￦ — (41,209 ) — — — 41,209 — Land (21,817 ) — — — 2 (1,660 ) (23,475 ) Buildings (61,920 ) — — 5,206 — (517 ) (57,231 ) Structures (186,554 ) — — 9,526 2,032 (5,013 ) (180,009 ) Machinery (158,907 ) — — 17,468 496 (16,842 ) (157,785 ) Vehicles (2,275 ) — — 2,064 4 (425 ) (632 ) Equipment (241 ) — — 149 — (135 ) (227 ) Tools (403 ) — — 243 — (79 ) (239 ) Construction-in-progress (61,211 ) — 8,783 — — (26,698 ) (79,126 ) Investment properties (13 ) — — 1 — (17 ) (29 ) Software (235 ) — — 99 — — (136 ) Development expenditures (1,492 ) — — 1,453 — (5,004 ) (5,043 ) Intangible assets under development (11,029 ) — — — — 3,826 (7,203 ) Other intangible assets (79 ) — — 4 — — (75 ) ￦ (506,176 ) (41,209 ) 8,783 36,213 2,534 (11,355 ) (511,210 ) 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 ) (3) Changes in government grants for specific business projects for the years ended December 31, 2020 and 2021 are as follows: 2020 Increase Decrease Contribution Interests Execution Return Department Project Description Period Budget Beginning Self- Local Government Self- Local Government Self- Local Government Self- Local Government Others Ending In millions of won Ministry of Trade, Industry and Energy Temporary electricity bill support for small business owners Temporary electricity bill support for small business owners 2020.04.01 ~ 2020.12.31 72,662 — — — 72,662 — — 16 — — (71,914 ) — — (16 ) — 748 Energy Voucher 2020 Energy Voucher 2020.01.01 ~ 2020.12.31 46,148 — — — 46,148 — — 2 — — (46,148 ) — — (2 ) — — 2021 Increase Decrease Contribution Interests Execution Return Department Project Description Period Budget Beginning Self- Local Government Self- Local Government Self- Local Government Self- Local Government Others Ending In millions of won Ministry of Trade, industry and Energy Temporary electricity bill support for small business owners Temporary electricity bill support for small business owners 2021.04.01 ~ 2022.06.30 211,235 748 — — 139,550 — — — — — (122,563 ) — — — — 17,735

Deferred Revenues

Deferred Revenues	12 Months Ended
	Dec. 31, 2021
Deferred income including contract liabilities [abstract]
Deferred Revenues	28. Deferred Revenues Deferred revenue for the years ended December 31, 2020 and 2021 are as follows which included in current and non-current non-financial liabilities in the consolidated statements of financial position: 2020 2021 In millions of won Beginning balance ￦ 9,201,538 9,868,189 Increase 1,310,128 1,149,578 Recognized as revenue (643,477 ) (661,212 ) Ending balance ￦ 9,868,189 10,356,555

Non-financial Liabilities

Non-financial Liabilities	12 Months Ended
	Dec. 31, 2021
Other Liabilities Disclosure [Abstract]
Non-financial Liabilities	29. Non-financial Liabilities Non-financial liabilities as of December 31, 2020 and 2021 are as follows: 2020 2021 Current Non-current Current Non-current In millions of won Advance received ￦ 3,693,043 331,596 4,157,916 398,056 Unearned revenue 35,068 6,122 40,187 6,517 Deferred revenue 625,596 9,242,593 659,397 9,697,158 Withholdings 257,059 9,909 345,892 5,171 Others 1,360,684 71,721 1,262,941 109,462 ￦ 5,971,450 9,661,941 6,466,333 10,216,364

Contributed Capital

Contributed Capital	12 Months Ended
	Dec. 31, 2021
Disclosure of classes of share capital [abstract]
Contributed Capital	30. Contributed Capital (1) Details of shares issued as of December 31, 2020 and 2021 are as follows: 2020 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. 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. (2) Details in number of outstanding capital stock for the years ended December 31, 2020 and 2021 are as follows. 2020 2021 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, 2020 and 2021 are as follows: 2020 2021 In millions of won Share premium ￦ 843,758 843,758

Retained Earnings and Dividends

Retained Earnings and Dividends Paid	12 Months Ended
	Dec. 31, 2021
Retained earnings [abstract]
Retained Earnings and Dividends Paid	31. Retained Earnings and Dividends Paid (1) Details of retained earnings as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Legal reserve(*) ￦ 1,604,910 1,604,910 Voluntary reserves 32,179,066 33,282,817 Retained earnings before appropriations 17,349,625 10,359,255 Retained earnings ￦ 51,133,601 45,246,982 (*) 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 capital or offset against accumulated deficit by the resolution of the shareholders. (2) Details of voluntary reserves as of December 31, 2020 and 2021 are as follows: 2020 2021 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 26,361,617 27,465,368 Reserve for equalizing dividends 210,000 210,000 ￦ 32,179,066 33,282,817 (*) 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, 2020 and 2021 are as follows: 2020 2021 In millions of won Beginning balance ￦ 49,202,133 51,133,601 Profit (loss) for the period attributed to owner of the controlling Company 1,991,347 (5,315,055 ) Changes in equity method retained earnings 3,181 3,609 Remeasurements of defined benefit liability, net of tax (62,857 ) 201,067 Transfer of gain (loss) on valuation of financial assets at FVOCI — 4,388 Dividends paid — (780,628 ) Transactions between consolidated entities (203 ) — Ending balance ￦ 51,133,601 45,246,982 (4) Dividends paid for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 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 ￦ — — 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 (5) Changes in retained earnings of investments in associates and joint ventures for the years ended December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Beginning balance ￦ (2,820 ) 361 Changes 3,181 3,609 Ending balance ￦ 361 3,970 (6) Changes in remeasurement components related to defined benefit liability for the years ended December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Beginning balance ￦ (117,779 ) (169,234 ) Changes (77,828 ) 327,957 Income tax effect 14,971 (126,890 ) Transfer to reserve for business expansion 11,402 67,011 Ending balance ￦ (169,234 ) 98,844

Statements of Appropriation of

Statements of Appropriation of Retained Earnings (Disposition of Deficit)	12 Months Ended
	Dec. 31, 2021
Statement of Appropriation of Retained Earnings [Abstract]
Statements of Appropriation of Retained Earnings (Disposition of Deficit)	32. Statements For the year ended December 31, 2020, KEPCO’s retained earnings were appropriated on March 25, 2021. For the year ended December 31, 2021, KEPCO’s deficits are expected to be disposed on March 29, 2022. The statements 2020 2021 In millions of won except for I.   Retained earnings before appropriations (undisposed deficit) Unappropriated retained earnings (deficit) carried over from prior years ￦ — — Net income (loss) 1,951,498 (5,607,732 ) Remeasurement of the defined benefit plan (67,118 ) 107,884 1,884,380 (5,499,848 ) II. Transfer from voluntary reserves — 5,499,848 III.  Subtotal ( I+II ) 1,884,380 — IV.  Appropriations of retained earnings (Disposition of deficit) Legal reserve — — Dividends (government, individual) (Amount of dividends per share (%) : Current year – ￦ 0 (0%), Prior year – ￦ 1,216 (24.32%)) (780,628 ) — Reserve for business expansion (1,103,752 ) — (1,884,380 ) — V. Unappropriated retained earnings to be carried over forward to subsequent year — —

Hybrid Bonds

Hybrid Bonds	12 Months Ended
	Dec. 31, 2021
Hybrid Bonds [Abstract]
Hybrid Bonds	33. Hybrid Bonds Hybrid bonds classified as equity (non-controlling interest) as of December 31, 2020 and 2021 are as follows: Issuer Hybrid bond Issued date Maturity Yield (%) 2020 2021 In millions of won Korea South-East 1st hybrid bond 2012.12.07 2042.12.06 4.38 ￦ 170,000 170,000 Korea South-East 2nd hybrid bond 2012.12.07 2042.12.06 4.44 230,000 230,000 Expense of issuance (1,090 ) (1,090 ) ￦ 398,910 398,910 Although these instruments have contractual maturity dates, th e As

Other Components of Equity

Other Components of Equity	12 Months Ended
	Dec. 31, 2021
Disclosure of reserves within equity [abstract]
Other Components of Equity	34. Other Components of Equity (1) Other components of equity of the parent as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Other capital surplus ￦ 1,224,105 1,231,109 Accumulated other comprehensive income (loss) (409,577 ) (57,632 ) Other equity 13,294,973 13,294,973 ￦ 14,109,501 14,468,450 (2) Changes in other capital surplus for the years ended December 31, 2020 and 2021 are as follows: 2020 2021 Gains on treasury stocks Others Subtotal Gains on disposal of treasury stocks Others Subtotal In millions of won Beginning balance ￦ 387,524 838,840 1,226,364 387,524 836,581 1,224,105 Changes in consolidation scope — — — — 43 43 Issuance of share capital of subsidiary — (148 ) (148 ) — (491 ) (491 ) Others — (2,111 ) (2,111 ) — 7,452 7,452 Ending balance ￦ 387,524 836,581 1,224,105 387,524 843,585 1,231,109 (3) Changes in accumulated other comprehensive income (loss) for the years ended December 31, 2020 and 2021 are as follows: 2020 Financial asset at fair value through other comprehensive income valuation reserve Shares in other income of investments in associates and Reserve for overseas translation credit Reserve for gain (loss) on derivatives Total In millions of won Beginning balance ￦ (92,599 ) 142,896 (294,898 ) (36,129 ) (280,730 ) Changes in the unrealized fair value of financial assets at FVOCI, net of tax (8,533 ) — — — (8,533 ) Shares in other comprehensive Income(loss) of associates and joint ventures, net of tax — (132,805 ) — — (132,805 ) Foreign currency translation of foreign operations, net of tax — — (46,032 ) — (46,032 ) Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax — — — 58,523 58,523 Ending balance ￦ (101,132 ) 10,091 (340,930 ) 22,394 (409,577 ) 2021 Financial assets at fair value through other comprehensive income valuation reserve Shares in other income of investments in associates and Reserve for overseas translation credit Reserve for gain (loss) on derivatives Total In millions of won Beginning balance ￦ (101,132 ) 10,091 (340,930 ) 22,394 (409,577 ) Changes in the unrealized fair value of financial assets at FVOCI, net of tax 59,022 — — — 59,022 Shares in other comprehensive income of associates and joint ventures, net of tax — 301,161 — — 301,161 Foreign currency translation of foreign operations, net of tax — — 15,760 — 15,760 Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax — — — (19,610 ) (19,610 ) Others (4,388 ) — — — (4,388 ) Ending balance ￦ (46,498 ) 311,252 (325,170 ) 2,784 (57,632 ) (4) Other equity as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Statutory revaluation reserve ￦ 13,295,098 13,295,098 Changes in other equity (125 ) (125 ) ￦ 13,294,973 13,294,973

Sales

Sales	12 Months Ended
	Dec. 31, 2021
Revenue [abstract]
Sales	35. Sales Details of sales for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 Domestic Overseas Domestic Overseas Domestic Overseas In millions of won [Type of goods and services] Sales of goods ￦ 56,609,330 285,546 56,380,608 303,704 58,261,006 441,203 Electricity 55,939,001 — 55,730,985 — 57,210,231 — Heat supply 220,948 — 198,715 — 232,294 — Others 449,381 285,546 450,908 303,704 818,481 441,203 Sales related to rendering of services 222,106 186,184 223,075 206,275 252,216 204,184 Sales of construction services 110,692 1,154,224 170,895 641,280 159,262 595,736 ￦ 56,942,128 1,625,954 56,774,578 1,151,259 58,672,484 1,241,123 [Timing of revenue recognition] Performance obligations satisfied at a point in time ￦ 56,609,330 285,546 56,380,608 303,704 58,261,006 441,203 Performance obligations satisfied over time 332,798 1,340,408 393,970 847,555 411,478 799,920 ￦ 56,942,128 1,625,954 56,774,578 1,151,259 58,672,484 1,241,123

Selling and Administrative Expe

Selling and Administrative Expenses	12 Months Ended
	Dec. 31, 2021
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, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Salaries ￦ 775,204 1,095,183 1,121,188 Retirement benefit expense 157,272 103,967 113,127 Welfare and benefit expense 120,463 155,071 155,558 Insurance expense 12,427 10,178 17,909 Depreciation 232,510 218,103 219,427 Amortization of intangible assets 76,547 87,086 91,428 Bad debt expense (12,719 ) 20,648 17,968 Commission 632,849 368,275 410,275 Advertising expense 34,453 29,559 29,230 Training expense 7,174 5,196 4,923 Vehicle maintenance expense 9,525 9,435 8,849 Publishing expense 3,414 3,677 3,568 Business promotion expense 3,038 3,614 3,522 Rent expense 40,505 36,337 43,650 Telecommunication expense 8,451 8,686 8,569 Transportation expense 865 1,007 870 Taxes and dues 58,666 62,828 93,446 Expendable supplies expense 6,682 8,029 9,052 Water, light and heating expense 11,867 11,749 12,351 Repairs and maintenance expense 88,576 79,185 123,134 Ordinary development expense 224,463 197,436 213,936 Travel expense 15,652 10,793 11,099 Clothing expense 9,369 14,834 10,540 Survey and analysis expense 848 826 889 Membership fee 969 1,274 1,331 Others 150,506 135,467 149,945 ￦ 2,669,576 2,678,443 2,875,784 (2) Details of “others” included in selling and administrative expenses for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Accommodation development expenses ￦ 53,945 30,889 57,815 Miscellaneous wages 39,794 45,887 47,221 Litigation and filing expenses 21,768 19,341 16,383 Compensation for damages (1,924 ) 8,374 3,303 Outsourcing expenses 3,293 3,610 3,799 Reward expenses 2,858 3,228 3,006 Overseas market development expenses 1,997 1,218 1,192 Others 28,775 22,920 17,226 ￦ 150,506 135,467 149,945

Other Income and Expenses

Other Income and Expenses	12 Months Ended
	Dec. 31, 2021
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, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Reversal of other provisions ￦ 16,542 25,826 15,548 Reversal of other allowance for doubtful accounts — 2,465 98 Gains on government grants 281 269 458 Gains on assets contributed 6,921 24,324 9,347 Gains on liabilities exempted 916 1,314 1,830 Compensation and reparations revenue 113,292 95,407 104,826 Revenue from foundation fund — — 1 Revenue from research contracts 5,276 4,001 5,996 Income related to transfer of assets from customers 604,808 643,477 661,212 Rental income 191,088 193,567 204,123 Others 58,849 45,798 30,694 ￦ 997,973 1,036,448 1,034,133 (2) Details of “others” included in other income for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Refund of claim for rectification ￦ 1,969 11,880 7,274 Adjustment of research project 3,294 2,150 7,638 Maintenance expenses on lease building 153 2,785 160 Training expenses 3,167 3,852 1,739 Deposit redemption 436 314 378 Reversal of expenses on litigation 9,926 620 991 Revenue on royalty fee — — 173 Reimbursement of insurance fee 610 22 1 Gains on guarantee contracts 135 134 27 Others 39,159 24,041 12,313 ￦ 58,849 45,798 30,694 (3) Other expenses for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Compensation and indemnification expense ￦ 403 11,959 663 Accretion expenses of other provisions 7,939 17,991 2,711 Depreciation expenses on investment properties 5,069 1,453 1,386 Depreciation expenses on idle assets 6,542 6,604 3,621 Other bad debt expense 29,348 32,503 49,372 Donations 64,752 316,981 152,456 Others 127,860 30,229 47,723 ￦ 241,913 417,720 257,932 (4) Details of “others” included in other expenses for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Operating expenses related to the idle assets ￦ 49 46 44 Research grants 399 91 109 Expenses related to supports 13,991 16,115 17,065 Expenses related to of a 5,234 5,101 6,948 Expenses on adjustment of research and development grants 554 720 2,241 Taxes and dues 188 253 119 Expenses on R&D supports 67 242 861 Others 107,378 7,661 20,336 ￦ 127,860 30,229 47,723

Other Gains (Losses)

Other Gains (Losses)	12 Months Ended
	Dec. 31, 2021
Other Gains (Losses) [Abstract]
Other Gains (Losses)	38. Other Gains (Losses) (1) Composition of other gains (losses) for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Other gains Gains on disposal of property, plant and equipment ￦ 43,784 93,195 56,284 Gains on disposal of intangible assets 206 1,556 1 Reversal of impairment loss on property, plant and equipment 16,692 7,805 — Reversal of impairment loss on intangible assets — — 14 Gains on foreign currency translation 16,340 8,917 20,598 Gains on foreign currency transaction 53,152 61,865 48,671 Gains on insurance proceeds 17,410 43,800 144 Others 238,688 322,379 250,174 Other losses Losses on disposal of property, plant and equipment (72,508 ) (162,725 ) (92,622 ) Losses on disposal of intangible assets (827 ) (392 ) (145 ) Losses on valuation of other non-current assets — (241 ) — Impairment loss on property, plant and equipment (50,034 ) (80,413 ) (4,056 ) Impairment loss on intangible assets (513,609 ) (3,599 ) — Impairment loss on other non-current assets (49,620 ) — (16,035 ) Losses on foreign currency translation (8,757 ) (17,664 ) (4,732 ) Losses on foreign currency transaction (55,283 ) (49,694 ) (67,990 ) Others (217,892 ) (189,695 ) (181,787 ) ￦ (582,258 ) 35,094 8,519 (2) Details of “others” included in other gains for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Gains on disposal of inventories ￦ 3,424 3,373 4,446 Gains on proxy collection of TV license fee 41,013 41,438 42,271 Gains on compensation of impaired electric poles 1,372 978 812 Gains on harbor facilities dues 3,741 2,231 3,281 Gains on technical fees 3,044 4,826 3,968 Reversal of occupation development training fees 1,472 352 229 Gains on disposal of waste 5,317 6,927 4,272 Gains on insurance 812 — 690 Gains on tax rebate 341 772 685 Gains on other commission 1,111 1,643 1,822 Gains on disposal of greenhouse gas emissions rights — — 8,739 Gains on disposal of assets held-for-sale 23,778 — 160 Others 153,263 259,839 178,799 ￦ 238,688 322,379 250,174 (3) Details of “others” included in other losses for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Losses on valuation of inventories ￦ 3,127 4,998 7,761 Losses on disposal of inventories 10,456 37,644 8,874 Losses due to disaster 7,635 16,814 6,238 Losses on rounding adjustment of electric charge surtax 1,268 1,276 1,283 Loss on disposal of greenhouse gas emissions rights — — 11,282 Others 195,406 128,963 146,349 ￦ 217,892 189,695 181,787

Finance Income

Finance Income	12 Months Ended
	Dec. 31, 2021
Finance income [Abstract]
Finance Income	39. Finance Income (1) Finance income for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Interest income ￦ 268,118 242,586 221,874 Dividends income 13,838 7,316 10,522 Gains on disposal of financial assets 3,866 11,992 7,718 Gains on valuation of financial assets at fair value through profit or loss 5,575 12,904 14,338 Gains on valuation of derivatives 362,735 57,563 860,011 Gains on transaction of derivatives 157,961 146,448 124,900 Gains on foreign currency translation 175,839 1,005,961 146,349 Gains on foreign currency transactions 21,774 24,009 15,618 Other financial income — 1,470 1,284 ￦ 1,009,706 1,510,249 1,402,614 (2) Details of interest income included in finance income for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Cash and cash equivalents ￦ 42,861 9,419 12,692 Financial assets at fair value through profit or loss 29,411 19,114 18,415 Financial assets at amortized cost 539 612 797 Loans 63,448 26,232 25,196 Short-term financial instruments 49,070 25,540 7,531 Long-term financial instruments 12,794 10,406 12,470 Other financial assets 54 228 230 Trade and other receivables 69,941 151,035 144,543 ￦ 268,118 242,586 221,874

Finance Expenses

Finance Expenses	12 Months Ended
	Dec. 31, 2021
Finance Expenses [Abstract]
Finance Expenses	40. Finance Expenses (1) Finance expenses for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Interest expense ￦ 2,046,811 1,995,425 1,914,457 Losses on sale of financial assets 2,106 648 1,045 Losses on valuation of financial assets at fair value through profit or loss 4,513 7,396 5,480 Losses on valuation of derivatives 45,385 513,278 37,017 Losses on transaction of derivatives 71,546 81,055 40,818 Losses on foreign currency translation 553,731 215,047 1,159,334 Losses on foreign currency transaction 55,509 79,103 83,558 Losses on repayment of financial liabilities — 35 10 Others 2,555 4,456 4,058 ￦ 2,782,156 2,896,443 3,245,777 (2) Details of interest expense included in finance expenses for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Trade and other payables ￦ 94,019 88,757 213,765 Short-term borrowings 42,971 29,358 42,371 Long-term borrowings 119,806 118,678 115,141 Debt securities 1,827,511 1,805,253 1,728,588 Other financial liabilities 558,464 540,867 384,423 2,642,771 2,582,913 2,484,288 Less: Capitalized borrowing costs (595,960 ) (587,488 ) (569,831 ) ￦ 2,046,811 1,995,425 1,914,457 Capitalization rates for the years ended December 31, 2019, 2020 and 2021 are 2.37%~3.44%, 2.14%~4.84% and 2.02%~4.33%, respectively.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2021
Income tax expense (benefit) [Abstract]
Income Taxes	41. Income Taxes (1) Income tax expense (benefit) for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Current income tax expense Payment of income tax ￦ 538,223 671,179 357,767 Adjustment in respect of prior years due to change in estimate (176,441 ) (63,756 ) 153,113 Current income tax directly recognized in equity (53,302 ) 51,486 (198,714 ) 308,480 658,909 312,166 Deferred tax expense (benefit) Generation and realization of temporary differences (636,984 ) (77,985 ) (489,411 ) Changes of unrecognized tax losses, tax credit and temporary differences for prior periods (22,469 ) (10,471 ) (43,653 ) Changes in deferred tax on tax losses carryforwards (582,011 ) 296,070 (1,641,823 ) Tax credit carryforwards (71,306 ) 32,541 (12,199 ) Amount due to change in tax rate or regulations 1,987 — 18,931 (1,310,783 ) 240,155 (2,168,155 ) Income tax expense (benefit) ￦ (1,002,303 ) 899,064 (1,855,989 ) (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, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Profit (loss) before income tax ￦ (3,265,838 ) 2,991,533 (7,085,214 ) Income tax expense (benefit) computed at applicable tax rate(*1) (898,105 ) 822,672 (1,948,434 ) Adjustments Effect of applying gradual tax rate 10,362 (10,362 ) (10,362 ) Effect of non-taxable income (9,990 ) (13,593 ) (4,983 ) Effect of non-deductible expenses 12,197 46,776 78,814 Effect of tax losses that are not recognized as deferred tax asset 57,490 — 1,351 Effects of tax credits and deduction (76,983 ) (63,753 ) (43,931 ) Reversal of unrecognized deferred tax asset, net (22,469 ) (10,471 ) (43,641 ) Effect of change in deferred tax due to change in tax rate 16,848 (17,590 ) 18,931 Deduction of deferred tax assets — 55,682 73,887 Deferred tax related to investments in subsidiaries, associates and joint ventures 147,598 102,137 (135,878 ) Others, net (62,810 ) 51,322 5,144 72,243 140,148 (60,668 ) Adjustment in respect of prior years due to change in estimate (176,441 ) (63,756 ) 153,113 Income tax expense (benefit) ￦ (1,002,303 ) 899,064 (1,855,989 ) Effective tax rate (*2 ) 30.05 % (*2 ) (*1) Applicable tax rate is 27.5% as of December 31, 2019, 2020 and 2021. (*2) The effective tax rate for the year ended December 31, 2019 and 2021 is not calculated due to income tax benefit and 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, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Dividends of hybrid bond and others ￦ 3,432 4,273 4,736 (4) Income tax recognized as other comprehensive income (loss) for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 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 ￦ (4,217 ) 19,447 (9,753 ) Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax (15,642 ) (47,231 ) 24,220 Remeasurement of defined benefit liability (40,235 ) 14,971 (126,890 ) Investments in associates 4,275 35,714 (53,672 ) Others (914 ) 24,312 (37,355 ) ￦ (56,733 ) 47,213 (203,450 ) (5) Changes in deferred tax assets (liabilities) recognized in the consolidated statements of financial position for the years ended December 31, 2020 and 2021 are as follows, continued: 2020 Beginning balance Amounts Amount Amounts recognized directly in equity Ending balance In millions of won Deferred tax on temporary differences Employee benefits ￦ 648,847 14,566 26,374 — 689,787 Cash flow hedge (999 ) 63,817 (47,231 ) — 15,587 Investments in subsidiaries, associates and joint ventures (8,665,727 ) (38,002 ) 35,714 — (8,668,015 ) Property, plant and equipment (7,115,218 ) (598,231 ) — — (7,713,449 ) Finance lease (160,443 ) (50,977 ) — — (211,420 ) Intangible assets (55,906 ) 24,740 — — (31,166 ) Financial assets at fair value through profit or loss 341 (328 ) — — 13 Financial assets at fair value through other comprehensive income 18,245 258 19,447 — 37,950 Deferred revenue 213,003 (13,302 ) — — 199,701 Provisions 5,456,919 459,884 — — 5,916,803 Doubtful receivables 59 (59 ) — — — Other finance liabilities 39,364 (13,238 ) — 4,273 30,399 Gains or losses on foreign exchange translation 57,961 (69,596 ) — — (11,635 ) Allowance for doubtful accounts 57,607 (1,478 ) — — 56,129 Accrued income (4,376 ) 13,320 — — 8,944 Special deduction for property, plant and equipment (215,373 ) (10,978 ) — — (226,351 ) Others 1,342,716 150,326 12,909 — 1,505,951 (8,382,980 ) (69,278 ) 47,213 4,273 (8,400,772 ) Deferred tax on unused tax losses and tax credit Unused tax losses 1,111,813 (218,739 ) — — 893,074 Excess of donation limit 36,695 (1,514 ) — — 35,181 Tax credit 107,526 (2,110 ) — — 105,416 1,256,034 (222,363 ) — — 1,033,671 ￦ (7,126,946 ) (291,641 ) 47,213 4,273 (7,367,101 ) 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 ) (6) Deferred tax assets (liabilities) recognized in the consolidated statements of financial position as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Deferred tax assets ￦ 1,733,146 1,901,992 Deferred tax liabilities (9,100,247 ) (7,100,938 ) ￦ (7,367,101 ) (5,198,946 ) (7) Details of deductible temporary differences, tax losses and unused tax credits for which no deferred tax assets were recognized as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Deductible temporary differences ￦ 1,405,621 1,539,980

Assets Held-for-Sale

Assets Held-for-Sale	12 Months Ended
	Dec. 31, 2021
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 as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Land(*1) ￦ — 2,907 Buildings(*1) 1 12,971 Investments(*1) — 1 Others(*2) 924 — ￦ 925 15,879 (*1) The board of directors of KEPCO Engineering & Construction Company, Inc., a subsidiary of the Company, made a resolution -si (*2) The Company had decided to sell its shares of DG Fairhaven Power, LLC, a subsidiary of the Company, and classified them as assets held-for-sale as of December 31, 2020. The disposal was completed during the year ended December 31, 2021.

Expenses Classified by Nature

Expenses Classified by Nature	12 Months Ended
	Dec. 31, 2021
Expenses by nature [abstract]
Expenses Classified by Nature	43. Expenses Classified by Nature Expenses classified by nature for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 Selling and Cost of Total In millions of won Raw materials used ￦ — 17,084,029 17,084,029 Salaries 775,204 3,834,772 4,609,976 Retirement benefit expense 157,272 652,467 809,739 Welfare and benefit expense 120,463 443,482 563,945 Insurance expense 12,427 93,702 106,129 Depreciation 232,510 10,734,246 10,966,756 Amortization of intangible assets 76,547 80,368 156,915 Bad debt expense (12,719 ) — (12,719 ) Commission 632,849 378,861 1,011,710 Advertising expense 34,453 9,852 44,305 Training expense 7,174 16,903 24,077 Vehicle maintenance expense 9,525 7,652 17,177 Publishing expense 3,414 3,423 6,837 Business promotion expense 3,038 3,981 7,019 Rent expense 40,505 176,413 216,918 Telecommunication expense 8,451 11,034 19,485 Transportation expense 865 4,555 5,420 Taxes and dues 58,666 481,684 540,350 Expendable supplies expense 6,682 32,999 39,681 Water, light and heating expense 11,867 32,378 44,245 Repairs and maintenance expense 88,576 2,210,278 2,298,854 Ordinary development expense 224,463 511,252 735,715 Travel expense 15,652 68,581 84,233 Clothing expense 9,369 7,539 16,908 Survey and analysis expense 848 3,949 4,797 Membership fee 969 12,730 13,699 Power purchase — 18,269,732 18,269,732 Others 150,506 2,612,973 2,763,479 ￦ 2,669,576 57,779,835 60,449,411 2020 Selling and Cost of Total In millions of won Raw materials used ￦ — 13,544,827 13,544,827 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 — 20,648 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 51,804,596 54,483,039 2021 Selling and Cost of Total In millions of won Raw materials used ￦ — 18,575,160 18,575,160 Salaries 1,121,188 4,272,971 5,394,159 Retirement benefit expense 113,127 487,834 600,961 Welfare and benefit expense 155,558 570,142 725,700 Insurance expense 17,909 104,544 122,453 Depreciation 219,427 11,547,677 11,767,104 Amortization of intangible assets 91,428 74,733 166,161 Bad debt expense 17,968 — 17,968 Commission 410,275 307,211 717,486 Advertising expense 29,230 9,552 38,782 Training expense 4,923 13,276 18,199 Vehicle maintenance expense 8,849 8,152 17,001 Publishing expense 3,568 3,300 6,868 Business promotion expense 3,522 3,777 7,299 Rent expense 43,650 193,470 237,120 Telecommunication expense 8,569 10,959 19,528 Transportation expense 870 53,365 54,235 Taxes and dues 93,446 529,183 622,629 Expendable supplies expense 9,052 41,367 50,419 Water, light and heating expense 12,351 42,934 55,285 Repairs and maintenance expense 123,134 2,492,030 2,615,164 Ordinary development expense 213,936 475,461 689,397 Travel expense 11,099 67,086 78,185 Clothing expense 10,540 7,994 18,534 Survey and analysis expense 889 3,955 4,844 Membership fee 1,331 8,492 9,823 Power purchase — 21,632,127 21,632,127 Others 149,945 2,022,426 2,172,371 ￦ 2,875,784 63,559,178 66,434,962

Earnings (Loss) Per Share

Earnings (Loss) Per Share	12 Months Ended
	Dec. 31, 2021
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, 2019, 2020 and 2021 are as follows: Type 2019 2020 2021 In won Basic earnings (loss) per share ￦ (3,654 ) 3,102 (8,279 ) (2) Diluted earnings (loss) per share for the years ended December 31, 2019, 2020 and 2021 are as follows: Type 2019 2020 2021 In won Diluted earnings (loss) per share ￦ (3,654 ) 3,102 (8,279 ) (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, 2019, 2020 and 2021 are as follows: Type 2019 2020 2021 In millions of won except number of shares Profit (loss) attributable to owners of the controlling company ￦ (2,345,517 ) 1,991,347 (5,315,055 ) Profit (loss) used in the calculation of total basic earnings (loss) per share (2,345,517 ) 1,991,347 (5,315,055 ) 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, 2019, 2020 and 2021 are as follows: Type 2019 2020 2021 In millions of won Profit (loss) used in the calculation of total diluted earnings (loss) per share ￦ (2,345,517 ) 1,991,347 (5,315,055 ) 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, 2019, 2020 and 2021 are as follows: Type 2019 2020 2021 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, 2019, 2020 and 2021.

Risk Management

Risk Management	12 Months Ended
	Dec. 31, 2021
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. Details of the Company’s capital management accounts as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Total borrowings and debt securities ￦ 69,724,581 80,529,513 Cash and cash equivalents 2,029,584 2,635,238 Net borrowings and debt securities 67,694,997 77,894,275 Total equity 70,666,846 65,311,849 Debt to equity ratio 95.79 % 119.27 % (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, 2020 and 2021 are as follows: 2020 2021 In millions of won Cash and cash equivalents ￦ 2,029,584 2,635,238 Financial assets at fair value through profit or loss(*1) 1,808,404 932,736 Derivative assets (trading) 110,764 443,027 Financial assets at fair value through other comprehensive income (debt securities) — 491 Financial assets at amortized cost 14,422 25,273 Loans 790,162 909,071 Long-term/short-term financial instruments 2,062,103 1,728,508 Derivative assets (applying hedge accounting) 55,649 204,756 Trade and other receivables 9,780,039 10,029,276 Financial guarantee contracts(*2) 3,224,696 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. As of the reporting date, there are no financial assets and non-financial assets that were acquired through the exercise of the right of collateralized assets and reinforcement of credit arrangement. (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 (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, 2020 and 2021 are as follows: 2020 2021 Type Accounts 1% Increase 1% Decrease 1% Increase 1% Decrease In millions of won Future salary increases Increase (decrease) in defined benefit obligation ￦ 488,087 (425,708 ) 466,832 (407,554 ) Discount rate Increase (decrease) in defined benefit obligation (443,527 ) 524,856 (422,290 ) 499,571 Changes of employee benefits assuming a 1% increase and decrease movements in discount rate on plan asset for the years ended December 31, 2020 and 2021 are ￦20,960 million and ￦25,649 million, respectively. ② Provisions Changes in provisions due to movements in underlying assumptions as of December 31, 2020 and 2021 are as follows: Type Accounts 2020 2021 PCBs Inflation rate 1.06 % 1.37 % Discount rate 1.83 % 1.88 % Nuclear plants Inflation rate 1.07 % 1.41 % Discount rate 2.20 % 2.20 % Spent fuel Inflation rate 2.93 % 2.93 % Discount rate 4.49 % 4.49 % A sensitivity analysis of provisions assuming a 0.1% increase and decrease movements in the underlying assumptions as of December 31, 2020 and 2021 are as follows: 2020 2021 Type Accounts 0.1% Increase 0.1% Decrease 0.1% Increase 0.1% Decrease In millions of won Discount rate PCBs ￦ (292 ) 293 (222 ) 223 Nuclear plants (326,926 ) 336,928 (369,540 ) 381,026 Spent fuel (51,558 ) 53,571 (51,430 ) 53,438 Inflation rate PCBs 295 (294 ) 224 (224 ) Nuclear plants 357,676 (347,450 ) 403,420 (391,754 ) Spent fuel 54,345 (52,375 ) 54,210 (52,245 ) 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, 2020 and 2021 are as follows: Assets Liabilities Type 2020 2021 2020 2021 In thousands of foreign currencies AED 39,678 6,481 31,594 31,637 AUD 133 3,733 707,538 926,960 BDT 93,442 50,145 — 577 BWP 890 939 — — EGP — — 948 595 CAD 247 582 1,840 2,266 CHF — — 500,406 500,230 CZK — — 2,033 386 EUR 310 1,809 121,069 42,981 GBP — — 43 — HKD — — 1,651,839 1,651,665 IDR 342,496 768,731 555,241 995,510 INR 1,231,895 1,715,900 155,134 342,833 JOD 1,673 1,852 — 118 JPY 825,269 697,747 484,585 153,383 KZT 1,510 1,510 — — MGA 5,645,349 4,262,857 — 475,807 MMK 11,032 210,335 — — MYR — 1,964 — — PHP 191,122 164,167 104,161 104,245 PKR 371,328 200,844 12,222 74,423 SAR 2,178 2,615 — — SEK — — 449,824 449,167 USD 1,445,522 1,381,441 12,234,563 12,023,085 UYU 78,265 90,930 1,585 3,097 VND 672,563 952,135 — 262,372 ZAR 303 31,971 — — 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, 2020 and 2021 are as follows: 2020 2021 Type 10% Increase 10% Decrease 10% Increase 10% Decrease In millions of won Increase (decrease) of profit before income tax ￦ (1,336,821 ) 1,336,821 (1,439,185 ) 1,439,185 Increase (decrease) of equity(*) (1,336,821 ) 1,336,821 (1,439,185 ) 1,439,185 (*) 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, 2020 and 2021. 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, 2021, 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, 2020 and 2021 are as follows: Type 2020 2021 In millions of won Short-term borrowings ￦ 171,518 391,897 Long-term borrowings 2,191,322 2,405,244 Debt securities 250,968 257,667 ￦ 2,613,808 3,054,808 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, 2020 and 2021 are as follows: 2020 2021 Type 1% Increase 1% Decrease 1% Increase 1% Decrease In millions of won Increase (decrease) of profit before income tax ￦ (26,138 ) 26,138 (30,548 ) 30,548 Increase (decrease) of shareholder’s equity(*) (26,138 ) 26,138 (30,548 ) 30,548 (*) 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 Following the approval of the Ministry of Trade, Industry and Energy (MOTIE) on December 17, 2020, the Company has adopted a new pricing system, “the cost pass-through tariff system”, beginning January 1, 2021. Under the cost pass-through system, the electricity rates are not predetermined at fixed rates but change upon approval by the MOTIE under Electric Utility Act of the Republic of Korea. 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, 2020 and 2021 is as follows: 2020 2021 Type 1% Increase 1% Decrease 1% Increase 1% Decrease In millions of won Increase (decrease) of profit before income tax ￦ 557,310 (557,310 ) 572,102 (572,102 ) Increase (decrease) of shareholder’s equity(*) 557,310 (557,310 ) 572,102 (572,102 ) (*) 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 financial liabilities as of December 31, 2020 and 2021 in detail are as follows: 2020 Type Less than 1 year 1~2 Years 2~5 Years More than 5 years Total In millions of won Borrowings and debt securities ￦ 12,413,346 10,919,041 24,778,020 34,215,888 82,326,295 Finance lease liabilities 614,442 569,161 1,564,377 2,461,557 5,209,537 Trade and other payables 5,679,856 373,907 894,903 1,167,171 8,115,837 Financial guarantee contracts(*) 926,244 348,860 26,230 1,923,362 3,224,696 ￦ 19,633,888 12,210,969 27,263,530 39,767,978 98,876,365 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 (*) This represents the total guarantee amounts associated with the financial guarantee contracts. Financial guarantee liabilities which are recognized as of December 31, 2020 and 2021 are ￦66,354 million and ￦80,841 million, respectively. The following table shows the details of maturities of non-derivative financial liabilities as of December 31, 2020 and 2021. This table, based on the undiscounted cash flows of the non-derivative financial liabilities including estimated interests, has been prepared based on the respective liabilities’ earliest maturity date. The expected maturities for non-derivative financial assets as of December 31, 2020 and 2021 in detail are as follows: 2020 Type Less than 1 year 1~5 Years More than 5 years Other (*) Total In millions of won Cash and cash equivalents ￦ 2,029,584 — — — 2,029,584 Financial assets at fair value through other comprehensive income — — — 358,559 358,559 Financial assets at amortized cost 13,149 1,265 8 — 14,422 Loans 78,805 385,571 325,212 31,506 821,094 Long-term/short-term financial instruments 1,483,482 252,349 386 325,886 2,062,103 Financial assets at fair value through profit or loss 1,196,101 — 2,690 682,591 1,881,382 Trade and other receivables 7,920,005 1,160,400 704,494 — 9,784,899 ￦ 12,721,126 1,799,585 1,032,790 1,398,542 16,952,043 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 (*) 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, 2020 and 2021 are as follows: 2020 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 (12,777 ) (22,827 ) (118,704 ) (4,380 ) (158,688 ) —Hedging (37,858 ) (39,528 ) (75,450 ) (55,208 ) (208,044 ) ￦ (50,635 ) (62,355 ) (194,154 ) (59,588 ) (366,732 ) 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 (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 ) Derivative assets classified by maturity periods which from reporting date to maturity dates as per the contracts as of December 31, 2020 and 2021 are as follows: 2020 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 18,332 1,529 45,237 52,163 117,261 —Hedging 11,191 — 41,206 3,252 55,649 ￦ 29,523 1,529 86,443 55,415 172,910 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 (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, 2020 and 2021 are as follows: 2020 2021 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 ￦ 358,559 358,559 435,107 435,107 Derivative assets (trading) 110,764 110,764 443,027 443,027 Derivative assets (applying hedge accounting) 55,649 55,649 204,756 204,756 Financial assets at fair value through profit or loss 1,881,382 1,881,382 1,032,864 1,032,864 ￦ 2,406,354 2,406,354 2,115,754 2,115,754 Assets carried at amortized cost Financial assets at amortized cost ￦ 14,422 14,422 25,273 25,273 Loans and receivables 790,162 790,162 909,071 909,071 Trade and other receivables 9,780,039 9,780,039 10,029,276 10,029,276 Long-term financial instruments 578,621 578,621 450,494 450,494 Short-term financial instruments 1,483,482 1,483,482 1,278,014 1,278,014 Cash and cash equivalents 2,029,584 2,029,584 2,635,238 2,635,238 ￦ 14,676,310 14,676,310 15,327,366 15,327,366 Liabilities recognized at fair value Derivative liabilities (trading) ￦ 157,926 157,926 56,256 56,256 Derivative liabilities (applying hedge accounting) 207,193 207,193 21,775 21,775 ￦ 365,119 365,119 78,031 78,031 Liabilities carried at amortized cost Secured borrowings ￦ 63,614 63,614 176,358 176,358 Unsecured bond 64,607,401 68,839,316 73,881,671 69,803,043 Lease liabilities 4,621,096 4,621,096 4,410,503 4,410,503 Unsecured borrowings 4,808,206 5,513,242 6,471,484 5,938,613 Trade and other payables(*) 8,115,837 8,115,837 9,739,421 9,739,421 Bank overdraft 245,360 245,360 — — ￦ 82,461,514 87,398,465 94,679,437 90,067,938 (*) 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 Type 2020 2021 Derivatives (-) 0.73% ~ 3.08% (-) 0.63% ~ 3.88% Borrowings and debt securities (-) 0.53% ~ 4.38% (-) 0.30% ~ 4.38% Finance lease 0.57% ~ 16.60% 0.00% ~ 16.83% (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, 2020 and 2021 are as follows: 2020 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 ￦ 194,670 — 163,889 358,559 Derivative assets — 166,413 — 166,413 Financial assets at fair value through profit or loss — 1,875,690 5,692 1,881,382 ￦ 194,670 2,042,103 169,581 2,406,354 Financial liabilities at fair value Derivative liabilities ￦ — 365,119 — 365,119 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 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 accounted for using the valuation results of external valuation services in which weighted average borrowing rates of interest of evaluated companies are used as the discount rates. The fair value of derivatives is measured using the discounted cash flow (DCM) model reflecting key input factors such as credit risks, interest rates and exchange rates. Changes of financial assets and liabilities which are classified as level 3 for the years ended December 31, 2020 and 2021 are as follows: 2020 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 ￦ 5,156 359 — 623 (446 ) — 5,692 Financial assets at fair value through other comprehensive income Unlisted securities 177,968 2,900 — (23,128 ) (1 ) 6,150 163,889 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

Service Concession Arrangements

Service Concession Arrangements	12 Months Ended
	Dec. 31, 2021
Disclosure of detailed information about service concession arrangements [abstract]
Service Concession Arrangements	46. Service Concession Arrangements (1) Gas Complex . Thermal Power Plant at Ilijan, Philippines (BOT) (i) Significant terms and concession period of the arrangement The Company has entered into a contract with National Power Corporation (the “NPC”), based in the Republic of the Philippines whereby the Company can collect the electricity rates which are composed of fixed costs and variable costs during the concession period from 2002 to 2022 after building, rehabilitating, and operating the power plant. (ii) Rights and classification of the arrangement The Company has the rights to use and own the power plant during the concession period from 2002 to 2022. At the end of the concession period, the Company has an obligation to transfer its ownership of the power plant to NPC. (iii) The Company’s expected future collections of service concession arrangements as of December 31, 2021 are as follows: Type Amounts In millions of won Less than 1 year ￦ 51,596 (2) Hydroelectric Power Generation at Semangka, Indonesia (BOT) (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) The Company’s expected future collections of service concession arrangements as of December 31, 2021 are as follows: Type Amounts In millions of won Less than 1 year ￦ 29,576 1 ~ 2 years 29,610 2 ~ 3 years 29,747 Over 3 years 542,683 ￦ 631,616

Related Parties

Related Parties	12 Months Ended
	Dec. 31, 2021
Disclosure of transactions between related parties [abstract]
Related Parties	(1) Related parties of the Company as of December 31, 2021 are as follows, continued: Type Related party Joint ventures (96 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 Investicii AD, RES Technology AD, Jamaica Public Service Company Limited, KV Holdings, Inc., Amman Asia Electric Power Company, Kelar S.A., PT. Tanjung Power Indonesia, Nghi Son 2 Power LLC, Daehan Wind Power PSC, Momentum, Barakah One Company, Nawah Energy Company, Yeonggwang Wind Power Co., Ltd., Chester Solar IV SpA, Chester Solar V SpA, Diego de Almagro Solar SpA, South Jamaica Power Company Limited, Daesan Green Energy Co., Ltd., RE Holiday Holdings LLC, RE Pioneer Holdings LLC, RE Barren Ridge 1 Holdings LLC, RE Astoria 2 LandCo LLC, RE Barren Ridge LandCo LLC, Laurel SpA, KIAMCO KOWEPO Bannerton Hold Co Pty Ltd, Chile Solar JV SpA, Cheong-Song Noraesan Wind Power Co., Ltd., Chester Solar I SpA, Solar Philippines Calatagan Corporation, Saemangeum Solar Power Co., Ltd., Chungsongmeon BongSan wind power Co., Ltd., Jaeun Resident Wind Power Plant Co., Ltd., DE Energia SpA, Dangjin Eco Power Co., Ltd., Haemodum Solar Co., Ltd., Yangyang Wind Power Co., Ltd., Horus Solar, S.A. De C.V., Recursos Solares PV De Mexico II, S.A. De C.V., S.A. De C.V., Sunmex Renovables, S.A. De C.V., Stavro Holding II AB, Solaseado Solar Power Co., Ltd., Yeongam Solar Power Co., Ltd., Samsu Wind Power Co., Ltd., Pulau Indah Power Plant Sdn. Bhd., Sam-Yang Photovoltaic Power Co., Ltd., NH-Amundi Global Infrastructure Investment Private Investment Trust 21, Shin-han BNPP Private Investment Trust for East-West Sunlight Dream, PT Barito Wahana Tenaga, Cheongna Energy Co., Ltd., Dayone Energy Co., Ltd., OneEnergy Asia Limited, KAS Investment I LLC, KAS Investment II LLC, Energyco Co., Ltd. (formerly, Energyco LLC), CAES, LLC, Hapcheon Floating Photovoltaic Power Plant Inc., Busan Industrial Solar Power Co., Ltd., Bitsolar Energy Co., Ltd., Naepo Green Energy Co., Ltd., Pulau Indah O&M Sdn. Bhd., Guadalupe Solar SpA, Omisan Wind Power Co., Ltd., Foresight Iberian Solar Group Holding, S.L., Yeongwol Eco Wind Co., Ltd., Gurae Resident Power Co., Ltd., Cheongju Eco Park Co., Ltd., Prime Swedish Holding AB, Enel X Midland Photovoltaic, LLC, Geumsungsan Wind Power Co., Ltd., KEPCO KPS Carabao Corp., Goheung New Energy Co., Ltd., Gunsan Land Solar Co., Ltd., CapMan Lynx SCA, SICAR, International Offshore Power Transmission Holding Company Limited 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, 2019, 2020 and 2021 are as follows: <Sales and Others> Sales and others Company name Transaction type 2019 2020 2021 In millions of won <Associates> Dongducheon Dream Power Co., Ltd. Electricity sales ￦ 7,071 7,757 19,923 Korea Gas Corporation Electricity sales 116,484 97,685 96,362 Daejung Offshore Wind Power Co., Ltd. Electricity sales 1 32 46 Daegu Photovoltaic Co., Ltd. Electricity sales 327 325 207 Haeng Bok Do Si Photovoltaic Power Co., Ltd. Electricity sales 2 2 2 Korea Electric Power Industrial Development Co., Ltd. Service 11,085 10,833 11,208 Goseong Green Power Co., Ltd. Electricity sales 19,245 47,701 514,470 Gangneung Eco Power Co., Ltd. Service 7,446 10,178 14,200 Shin Pyeongtaek Power Co., Ltd. Electricity sales 21,218 20,791 23,501 Noeul Green Energy Co., Ltd. Electricity sales 30 30 30 Samcheok Eco Materials Co., Ltd. Electricity sales 627 700 620 YTN Co., Ltd. Electricity sales 2,257 1,805 1,922 Busan Green Energy Co., Ltd. Electricity sales 18 34 49 Gunsan Bio Energy Co., Ltd. Electricity sales 4,755 102 20 Korea Electric Vehicle Charging Service Electricity sales 1,029 1,956 3,059 Energy Infra Asset Management Co., Ltd. Electricity sales — — 4,629 Gangwon Wind Power Co., Ltd. Electricity sales 2,433 2,109 1,865 Gwangyang Green Energy Co., Ltd. Electricity sales 122 23 486 Bigeum Resident Photovoltaic Power Co., Ltd. Electricity sales — 85 755 Hyundai Green Power Co., Ltd. Electricity sales and design service 13,106 17,257 11,934 Korea Power Exchange Service 7,670 25,919 39,796 Taebaek Wind Power Co., Ltd. Service 991 226 44 Taebaek Guinemi Wind Power Co., Ltd. Electricity sales 77 37 26 Pyeongchang Wind Power Co., Ltd. Electricity sales 1,189 2,064 1,180 Daeryun Power Co., Ltd. Electricity sales 1,879 1,947 1,944 Changjuk Wind Power Co., Ltd. Electricity sales 927 2,067 463 GS Donghae Electric Power Co., Ltd. Electricity sales 15,792 31,557 21,127 KNH Solar Co., Ltd. Electricity sales 17 16 14 S-Power Co., Ltd. Service 6,535 6,682 5,229 PND Solar Electricity sales 407 409 416 Hyundai Eco Energy Co., Ltd. Electricity sales 117 167 187 YeongGwang Yaksu Wind Electric Co., Ltd. Electricity sales 81 77 78 Taebaek Gadeoksan Wind Power Co., Ltd.(*2) Electricity sales — — 295 Korea Energy Solutions Co., Ltd. Electricity sales 52 7 2 ITR Co., Ltd. Service — — 3 Structure test network Co., Ltd. Service — — 5 Green Energy Electricity Generation Co., Ltd. Electricity sales — 14 — Namjeongsusang Solar Power Operation Co., Ltd. Electricity sales — 14 22 Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 Service — 291 399 Bitgoel Eco Energy Co., Ltd. Electricity sales — — 282 Muan Solar Park Co., Ltd. Electricity sales — 57 232 Anjwa Smart Farm & Solar City Co., Ltd. Electricity sales — — 624 Daewon Green Energy Co., Ltd. Electricity sales — — 155 Saemangeum Heemang Photovoltaic Co., Ltd. Electricity sales — — 13 UD4M Co., Ltd. Electricity sales — — 4 Dongbu Highway Solar Co., Ltd. Electricity sales — — 5 Seobu Highway Solar Co., Ltd. Electricity sales — — 8 SureDataLab Co., Ltd. Electricity sales — — 1 Suwon New Power Co., Ltd. Electricity sales 5,606 2,974 1,820 Hankook Electric Power Information Co., Ltd. Electricity sales — — 1 Kosture Electricity sales — — 1 Muan Sunshine Solar Power Plant Co., Ltd. Electricity sales — 30 52 9 Associates (Overseas) Electricity sales and others 98,450 66,755 125,723 Sales and others Company name Transaction type 2019 2020 2021 In millions of won <Joint ventures> Naepo Green Energy Co., Ltd. Electricity sales ￦ 154 217 467 Cheongna Energy Co., Ltd. Service 9,922 13,791 16,469 Dayone Energy Co., Ltd.(formerly, Hyundai Energy Co., Ltd.) Service 3,437 4,816 8,159 Daegu Green Power Co., Ltd. Electricity sales 1,151 1,285 1,053 KAPES, Inc. Commission 504 476 413 Honam Wind Power Co., Ltd. Electricity sales 657 502 71 Jeongam Wind Power Co., Ltd. (*1) Electricity sales and 1,198 1,213 588 Korea Power Engineering Service Co., Ltd. Service 348 203 339 Seokmun Energy Co., Ltd. Service 1,495 1,932 1,701 Incheon New Power Co., Ltd. Construction revenue 354 14 14 Chun-cheon Energy Co., Ltd. Electricity sales 2,397 2,657 2,329 Yeonggwangbaeksu Wind Power Co., Ltd. Electricity sales 1,744 1,788 1,836 Yeonggwang Wind Power Co., Ltd. Electricity sales 705 793 818 Sam-Yang Photovoltaic Power Co., Ltd. Electricity sales — 33 1,920 NH-Amundi Global Infrastructure Investment Private Investment Trust 21 Service — 1,388 1,727 KW Nuclear Components Co., Ltd. Service 721 1,639 2,598 KEPCO-Uhde Inc. Electricity sales 15 8 10 Busan Shinho Solar Power Co., Ltd. Electricity sales 452 353 376 Daesan Green Energy Co., Ltd. Electricity sales 39 703 523 Taebaek Gadeoksan Wind Power Co., Ltd. (*2) Electricity sales — 3 2 Cheong-Song Noraesan Wind Power Co., Ltd. Electricity sales 6 29 30 Chungsongmeon BongSan wind power Co., Ltd. Electricity sales — — 1 Saemangeum Solar Power Co., Ltd. Service 2,230 2,846 1,141 Jaeun Resident Wind Power Plant Co., Ltd. Electricity sales 105 — — Dangjin Eco Power co., Ltd. Electricity sales 4 33 32 Energyco Co., Ltd. (formerly, Energyco LLC) Electricity sales — — 1 Busan Industrial Solar Power Co., Ltd. Electricity sales — — 9 Bitsolar Energy Co., Ltd. Electricity sales — 42 296 Omisan Wind Power Co., Ltd. Electricity sales — — 1 Haemodum Solar Co., Ltd. Electricity sales — 4 6 Yeongam Solar Power Co., Ltd. Electricity sales — 165 339 Solaseado Solar Power Co., Ltd. Electricity sales — 66 2,890 35 Joint ventures (Overseas) Electricity sales and others 1,275,279 831,596 773,289 <Others> Korea Development Bank Electricity sales 3,948 4,248 4,177 Interest income 2,091 3,461 756 (3) Related party transactions for the years ended December 31, 2019, 2020 and 2021 are as follows, continued: <Purchase and Others> Purchase and others Company name Transaction type 2019 2020 2021 In millions of won <Associates> Dongducheon Dream Power Co., Ltd. Electricity purchase ￦ 689,510 552,692 750,148 Korea Gas Corporation Purchase of power generation fuel 4,049,486 3,270,972 5,646,713 Daegu Photovoltaic Co., Ltd. REC purchase 3,626 3,313 3,532 Haeng Bok Do Si Photovoltaic Power Co., Ltd. REC purchase 450 370 393 Korea Electric Power Industrial Development Co., Ltd. Electricity metering service 245,057 212,366 241,925 Goseong Green Power Co., Ltd. Electricity purchase 32 — 987,540 Shin Pyeongtaek Power Co., Ltd. Electricity purchase 119,162 520,737 653,306 Noeul Green Energy Co., Ltd. REC purchase 22,767 10,634 10,014 Samcheok Eco Materials Co., Ltd. Electricity purchase 9,425 10,713 13,612 YTN Co., Ltd. Service 333 353 388 Busan Green Energy Co., Ltd. Electricity purchase 13,811 18,678 18,996 Gunsan Bio Energy Co., Ltd. Electricity purchase 3,022 24 — Korea Electric Vehicle Charging Service Service 536 581 393 Energy Infra Asset Management Co., Ltd. Service — — 2,657 Yaksu ESS Co., Ltd. Service 1,191 217 1,715 Gangwon Wind Power Co., Ltd. Electricity purchase 24,116 23,350 19,623 Goesan Solar park Co., Ltd. Electricity purchase — — 6,209 Hyundai Green Power Co., Ltd. Electricity purchase 507,662 349,778 — Korea Power Exchange Trading fees 120,509 87,361 86,716 Taebaek Wind Power Co., Ltd. Electricity purchase 7,070 4,003 5,930 Taebaek Guinemi Wind Power Co., Ltd. Electricity purchase 349 5,023 5,910 Pyeongchang Wind Power Co., Ltd. Electricity purchase 5,188 3,969 4,099 Daeryun Power Co., Ltd. Electricity purchase 144,862 99,523 157,234 Changjuk Wind Power Co., Ltd. Electricity purchase 6,994 6,084 6,213 GS Donghae Electric Power Co., Ltd. Electricity purchase 681,379 660,351 760,377 KNH Solar Co., Ltd. Electricity purchase 3,377 3,564 3,222 S-Power Co., Ltd. Electricity purchase 522,469 293,515 608,530 PND Solar Electricity purchase 557 5,234 5,502 Hyundai Eco Energy Co., Ltd. Electricity purchase 6,810 17,777 25,762 YeongGwang Yaksu Wind Electric Co., Ltd. Electricity purchase 6,511 9,151 11,729 Taebaek Gadeoksan Wind Power Co., Ltd. (*2) Electricity purchase — — 16,360 Green Energy Electricity Generation Co., Ltd. Electricity purchase — — 1,238 Namjeongsusang Solar Power Operation Co., Ltd. Electricity purchase — — 14,286 Jeju Gimnyeong Wind Power Co., Ltd. Electricity purchase — — 12,833 Seoroseoro Sunny Power Plant Co., Ltd. Electricity purchase — — 217 Muan Solar Park Co., Ltd. Electricity purchase — — 31,017 YuDang Solar Co., Ltd. Electricity purchase — — 3,495 Anjwa Smart Farm & Solar City Co., Ltd. Electricity purchase — — 24,601 Dongbu Highway Solar Co., Ltd. Electricity purchase — — 2,605 Seobu Highway Solar Co., Ltd. Electricity purchase — — 2,936 Korea Energy Solution Co., Ltd. Electricity purchase 15 — — Gwangbaek Solar Power Investment Co., Ltd. Electricity purchase — 373 742 Muan Sunshine Solar Power Plant Co., Ltd. Electricity purchase — — 15,900 1 Associates (Overseas) Electricity purchase — — 502 <Purchase and Others> Purchase and others Company name Transaction type 2019 2020 2021 In millions of won <Joint ventures> Cheongna Energy Co., Ltd. Electricity purchase ￦ 58,747 66 57 Dayone Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.) Electricity purchase 2,847 1,120 5,409 Daegu Green Power Co., Ltd. Electricity purchase 296,464 215,224 289,052 KAPES, Inc. Service 142,511 219,673 64,140 Honam Wind Power Co., Ltd. Electricity purchase 5,306 4,382 4,807 Jeongam Wind Power Co., Ltd. (*1) Electricity purchase — 5,982 3,145 Korea Power Engineering Service Co., Ltd. Service 1,774 1,594 1,315 Seokmun Energy Co., Ltd. Electricity purchase 26,370 33,164 44,315 Chun-cheon Energy Co., Ltd. Electricity purchase 313,471 222,069 327,536 Yeonggwangbaeksu Wind Power Co., Ltd. Electricity purchase 11,739 11,232 9,471 Yeonggwang Wind Power Co., Ltd. Electricity purchase 11,940 24,103 21,004 Sam-Yang Photovoltaic Power Co., Ltd. Electricity purchase — 3,848 5,852 KW Nuclear Components Co., Ltd. Service — — 96 Busan Shinho Solar Power Co., Ltd. REC purchase 7,843 7,296 7,895 Global Trade Of Power System Co., Ltd. Service 502 337 323 Expressway Solar-light Power Generation Co., Ltd. REC purchase 3,067 2,472 3,146 Daesan Green Energy Co., Ltd. Electricity purchase — 104,854 146,776 Taebaek Gadeoksan Wind Power Co., Ltd. (*2) Electricity purchase — — 5,080 Saemangeum Solar Power Co., Ltd. Electricity purchase — — 5 Dangjin Eco Power Co., Ltd. Electricity purchase — 3,953 4,139 Busan Industrial Solar Power Co., Ltd. Electricity purchase — 19 2,815 Bitsolar Energy Co., Ltd. Electricity purchase — — 5,703 Omisan Wind Power Co., Ltd. Electricity purchase — — 7 Haemodum Solar Co., Ltd. Electricity purchase — 967 1,625 Yeongam Solar Power Co., Ltd. Electricity purchase — 32,208 47,805 Samsu Wind Power Co., Ltd. Electricity purchase — — 2,800 Solaseado Solar Power Co., Ltd. Electricity purchase — 28,516 31,031 5 Joint ventures (Overseas) Electricity purchase and 7,232 14,767 49,055 <Others> Korea Development Bank Interest expense 4,063 3,872 2,756 Dividends paid 20 17 256,862 (*1) Reclassified from a joint venture to a subsidiary during the year ended December 31, 2021. Transactions are made before the reclassification. (*2) Reclassified from a joint venture to an associate during the year ended December 31, 2021. (4) Receivables and payables arising from related party transactions as of December 31, 2020 and 2021 are as follows: Receivables Payables Company name Type 2020 2021 2020 2021 In millions of won <Associates> Dongducheon Dream Power Co., Ltd. Trade receivables ￦ 388 6,282 — — Non-trade receivables and others 213 493 — — Trade payables — — 65,794 114,613 Korea Gas Corporation Trade receivables 9,969 10,015 — — Non-trade receivables and others 95 187 — — Trade payables — — 428,763 800,509 Non-trade payables and others — — 617 759 Daejung Offshore Wind Power Co., Ltd. Non-trade receivables and others 31 77 — — Daegu Photovoltaic Co., Ltd. Trade payables — — 57 115 Korea Electric Power Industrial Development Co., Ltd. Trade receivables 508 269 — — Non-trade receivables and others 16 15 — — Trade payables — — 133 873 Non-trade payables and others — — 3,779 5,880 Goseong Green Power Co., Ltd. Trade receivables 2,181 495 — — Non-trade receivables and others 9,214 76,855 — — Trade payables — — — 218,627 Non-trade payables and others — — 64,986 59,987 Gangneung Eco Power Co., Ltd. Trade receivables 661 826 — — Non-trade receivables and others 146 465 — — Non-trade payables and others — — — 97 Shin Pyeongtaek Power Co., Ltd. Trade receivables 1,348 1,788 — — Non-trade receivables and others 2,823 3,116 — — Trade payables — — 47,948 79,828 Non-trade payables and others — — 85 99 Noeul Green Energy Co., Ltd. Trade receivables 3 3 — — Non-trade receivables and others 969 1,169 — — Samcheok Eco Materials Co., Ltd. Trade receivables 47 52 — — YTN Co., Ltd. Trade receivables 97 99 — — Busan Green Energy Co., Ltd. Trade receivables 5 1 — — Non-trade receivables and others 13,946 20,658 — — Gunsan Bio Energy Co., Ltd. Non-trade receivables and others — 11,728 — — Korea Electric Vehicle Charging Service Trade receivables 141 193 — — Non-trade receivables and others 281 120 — — Yaksu ESS Co., Ltd. Trade payables — — 739 1,374 Gangwon Wind Power Co., Ltd. Trade receivables 6 8 — — Trade payables — — 2,678 4,293 Gwangyang Green Energy Co., Ltd. Non-trade receivables and others 1,356 532 — — Bigeum Resident Photovoltaic Power Co., Ltd. Trade receivables — 922 — — Goesan Solar park Co., Ltd. Trade payables — — — 73 Hyundai Green Power Co., Ltd. Trade receivables 554 229 — — Trade payables — — 9,825 — Korea Power Exchange Trade receivables 1,608 627 — — Non-trade receivables and others 24 1,300 — — Trade payables — — 1,362 — Non-trade payables and others — — 70,456 2,189 Taebaek Wind Power Co., Ltd. Non-trade receivables and others 1,405 — — — Trade payables — — 443 560 Non-trade payables and others — — — 262 Taebaek Guinemi Wind Power Co., Ltd. Trade payables — — 413 670 Non-trade payables and others — — 509 — Pyeongchang Wind Power Co., Ltd. Trade receivables 3 4 — — Daeryun Power Co., Ltd. Trade receivables 189 213 — — Trade payables — — 16,079 21,362 Changjuk Wind Power Co., Ltd. Trade payables — — 461 724 Non-trade payables and others — — 309 295 GS Donghae Electric Power Co., Ltd. Trade receivables 386 383 — — Non-trade receivables and others 321 272 — — Trade payables — — 91,213 113,529 Non-trade payables and others — — 36 17 Receivables Payables Company name Type 2020 2021 2020 2021 In millions of won <Associates> KNH Solar Co., Ltd. Trade receivables ￦ 1 1 — — Trade payables — — 14 — Non-trade payables and others — — 187 — Trade receivables 137 82 — — S-Power Co., Ltd. Non-trade receivables and others 46 48 — — Trade payables — — 23,415 91,277 PND Solar Trade payables — — 58 — Hyundai Eco Energy Co., Ltd. Trade receivables 16 19 — — Trade payables — — — 732 YeongGwang Yaksu Wind Electric Co., Ltd. Trade receivables 8 6 — — Taebaek Gadeoksan Wind Power Co., Ltd.(*2) Non-trade receivables and others — 119 — — Trade payables — — — 8,397 Non-trade payables and others — — — 1,571 Bitgoel Eco Energy Co., Ltd. Non-trade receivables and others — 27 — — Jeju Gimnyeong Wind Power Co., Ltd. Trade payables — — — 885 Muan Solar Park Trade receivables 24 — — — Non-trade receivables and others — 23 — — Daewon Green Energy Co., Ltd. Non-trade receivables and others — 94 — — Dongbu Highway Solar Co., Ltd. Trade receivables — 1 — — Trade payables — — — 98 Non-trade payables and others — — — 90 Seobu Highway Solar Co., Ltd. Trade payables — — — 177 Non-trade payables and others — — — 105 Go deok Clean Energy Co., Ltd. Non-trade receivables and others 1 — — — Suwon New Power Co., Ltd. Trade receivables 2 — — — Non-trade receivables and others 712 1,198 — — Kosture Trade receivables — 1 — — Muan Sunshine Solar Power Plant Co., Ltd. Trade payables — — — 1,748 4 Associates (Overseas) Non-trade receivables and others 3,248 3,196 — — Non-trade payables and others — — — 502 <Joint ventures> Naepo Green Energy Co., Ltd. Trade receivables 56 42 — — Dayone Energy Co., Ltd. Trade receivables 57 52 — — Non-trade receivables and others 11,749 13,297 — — Trade payables — — 10 1,009 Non-trade payables and others — — 9,119 11,306 Daegu Green Power Co., Ltd. Trade receivables 44 71 — — Non-trade receivables and others 55 55 — — Trade payables — — 26,213 35,766 KAPES, Inc. Trade receivables 2 2 — — Non-trade receivables and others 5,172 — — — Non-trade payables and others — — 20,577 2,121 Honam Wind Power Co., Ltd. Trade payables — — 216 575 Non-trade payables and others — — 345 — Jeongam Wind Power Co., Ltd.(*1) Non-trade receivables and others 162 — — — Non-trade payables and others — — 692 — Korea Power Engineering Service Co., Ltd. Non-trade receivables and others 43 48 — — Seokmun Energy Co., Ltd. Trade receivables 62 34 — — Non-trade receivables and others 9,460 149 — — Trade payables — — 4,898 7,941 Non-trade payables and others — — 9,559 — Chun-cheon Energy Co., Ltd. Trade receivables 98 126 — — Non-trade receivables and others 165 167 — — Trade payables — — 27,428 41,410 Yeonggwangbaeksu Wind Power Co., Ltd. Trade receivables 8 6 — — Non-trade receivables and others 159 53 — — Trade payables — — 405 1,099 Non-trade payables and others — — 1,747 — Receivables Payables Company name Type 2020 2021 2020 2021 In millions of won <Joint ventures> Cheongna Energy Co., Ltd. Trade receivables ￦ 1,592 4,164 — — Non-trade receivables and others 1,186 1,350 — — Non-trade payables and others — — — 1 Yeonggwang Wind Power Co., Ltd. Trade receivables 12 10 — — Non-trade receivables and others 54 59 — — Trade payables — — 886 730 Non-trade payables and others — — 3,038 — Sam-Yang Photovoltaic Power Co., Ltd. Trade receivables 5 5 — — Non-trade payables and others — — 625 — KW Nuclear Components Co., Ltd. Trade receivables 4 — — — KEPCO-Uhde Inc. Non-trade payables and others — — — 10 Busan Shinho Solar Power Co., Ltd. Trade receivables 2 2 — — Trade payables — — 135 281 Non-trade payables and others — — 780 — Global Trade Of Power System Co., Ltd. Non-trade payables and others — — — 7 Expressway Solar-light Power Generation Co., Ltd. Trade payables — — — 102 Daesan Green Energy Co., Ltd. Trade receivables 11 11 — — Non-trade receivables and others 216 120 — — Trade payables — — 7,694 5,120 Taebaek Gadeoksan Wind Power Co., Ltd.(*2) Non-trade receivables and others 5 — — — Trade payables — — 2,473 — Non-trade payables and others — — 5 — Cheong-Song Noraesan Wind Power Co., Ltd. Trade receivables 2 2 — — Saemangeum Solar Power Co., Ltd. Non-trade receivables and others 3,141 4,268 — — Dangjin Eco Power Co., Ltd. Trade receivables 3 3 — — Trade payables — — 326 276 Busan Industrial Solar Power Co., Ltd. Trade receivables — 1 — — Trade payables — — 1 54 Non-trade payables and others — — — 24 Bitsolar Energy Co., Ltd. Non-trade receivables and others — 7 — — Non-trade payables and others — — — 54 Haemodum Solar Co., Ltd. Trade receivables — 1 — — Yeongam Solar Power Co., Ltd. Trade receivables 26 29 — — Trade payables — — 14,652 3,324 Samsu Wind Power Co., Ltd. Trade payables — — — 1,300 18 Joint ventures (Overseas) Trade receivables 58,839 84,150 — — Non-trade receivables and others 17,217 26,060 — — Non-trade payables and others — — 105,682 22,050 <Others> Korea Development Bank Accrued interest income 51 154 — — Non-trade receivables and others 206,916 420,732 — — Non-trade payables and others — — 123 21,172 Derivatives 20,167 59,139 20,001 — (*1) Reclassified from a joint venture to a subsidiary during the year ended December 31, 2021. Transactions are made before the reclassification. (*2) Reclassified from a joint venture to an associate during the year ended December 31, 2021. (5) Loans and others arising from related party transactions as of December 31, 2020 and 2021 are as follows: Type Company name Beginning Loans Collection Others Ending balance In millions of won Associate KNOC Nigerian East Oil Co., Ltd., KNOC Nigerian West Oil Co., Ltd. ￦ 27,149 34 — 2,298 29,481 (Allowance for doubtful accounts) (5,246 ) — — (2,995 ) (8,241 ) Associate Xe-Pian Xe-Namnoy Power Co., Ltd. 19,692 — — 1,764 21,456 Associate PT Wampu Electric Power 12,358 — (1,349 ) 1,991 13,000 Associate Gunsan Bio Energy Co., Ltd. 12,396 — — — 12,396 (Allowance for doubtful accounts) (10,128 ) (2,268 ) — — (12,396 ) Associate Bigeum Resident Photovoltaic Power Co., Ltd. 3,500 7,712 — — 11,212 Associate Daejung Offshore Wind Power Co., Ltd. 1,000 — — — 1,000 Associate Bitgoel Eco Energy Co., Ltd. — 19,349 — — 19,349 Joint venture Solaseado Solar Power Co., Ltd. 64,000 10,000 (39,000 ) — 35,000 Joint venture Recursos Solares De Mexico D e 4,844 2,282 (1,450 ) 458 6,134 Joint venture Horus Solar e 13,380 2,755 (843 ) 1,222 16,514 Joint venture Sunmex Renovables, S.A. d 1,842 11,377 — 352 13,571 Joint venture Kelar S.A. 39,616 — — 3,551 43,167 Joint venture DE Energia SpA 6,232 — — 559 6,791 Joint venture Daehan Wind Power PSC 10,700 1,927 — 1,047 13,674 Joint venture PT. Tanjung Power Indonesia 705 314 — 71 1,090 Joint venture Bitsolar Energy Co., Ltd. 3,165 — — — 3,165 Joint venture Pulau Indah Power Plant Sdn. Bhd. — 10,006 — (10,006 ) — Joint venture Guadalupe Solar SpA — 3,365 (6 ) 1 3,360 Joint venture Foresight Iberian Solar Group Holding, S.L. — 9,376 (424 ) 50,381 59,333 Joint venture Capman Lynx SCA, SICAR — 30,001 — (231 ) 29,770 ￦ 205,205 106,230 (43,072 ) 50,463 318,826 (6) Borrowings arising from related party transactions as of December 31, 2020 and 2021 are as follows: Related parties Type Beginning balance Borrowings Repayment Others Ending balance In millions of won Korea Development Bank Facility ￦ 50,293 56,906 (10,863 ) 1,684 98,020 Others 2,946 — (437 ) — 2,509 Operating funds 144,300 140,000 (100,000 ) — 184,300 Syndicated Loans 15,923 — (1,042 ) (351 ) 14,530 EBL and others 40,093 9,923 — 3,949 53,965 ￦ 253,555 206,829 (112,342 ) 5,282 353,324 (7) Guarantees provided to associates or joint ventures as of December 31, 2021 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 Korea Electric Power Corporation Rabigh Operation & Maintenance Company Limited Performance guarantees and others USD 1,387 Rabigh Electricity Korea Electric Power Corporation Nghi Son 2 Power LLC Performance guarantees USD 70,000 SMBC Ho Chi Minh and Debt guarantees USD 285,000 SMBC Singapore Korea Electric Power Corporation Barakah One Company Debt guarantees USD 1,223,355 Export-Import Bank of Performance guarantees and others USD 4,349,360 Korea Electric Power Corporation RE Holiday Holdings LLC Performance guarantees(*10) USD 222,077 EFS Renewables Holdings, Korea Electric Power Corporation RE Pioneer Holdings LLC Performance guarantees USD 106,873 EFS Renewables Holdings, Korea Electric Power Corporation RE Barren Ridge 1 Holdings LLC Performance guarantees(*10) USD 68,838 Firstar Development, LLC 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 Korea Electric Power Corporation Sunmex Renovables, S.A. De C.V. Other performance guarantees USD 9,078 CENACE Korea Electric Power Corporation MXN 3,666 SEMARNAT Korea Electric Power Corporation Pulau Indah Power Plant Sdn. Bhd. Collateralized money invested KRW 22,099 Malaysian Trustee Berhad Korea Western Power Co., Ltd. Cheongna Energy Co., Ltd. Collateralized money invested KRW 11,198 Kookmin Bank and others Guarantees for supplemental funding (*1) — Korea Western Power Co., Ltd. Xe-Pian Xe-Namnoy Power Co., Ltd. Payment guarantees for business reserve USD 2,500 Krung Thai Bank Collateralized money invested KRW 92,441 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 2,342 Korea Development Bank Korea Western Power Co., Ltd. Dongducheon Dream Power Co., Ltd. Collateralized money invested(*5) KRW 39,524 Kookmin Bank and others Debt guarantees KRW 20,300 BNK Securities Korea Western Power Co., Ltd. PT. Mutiara Jawa Collateralized money invested KRW 2,569 Woori Bank Korea Western Power Co., Ltd. Haeng Bok Do Si Photovoltaic Power Co., Ltd. Collateralized money invested KRW 223 Nonghyup Bank Korea Western Power Co., Ltd. Shin Pyeongtaek Power Co., Ltd. Collateralized money invested KRW 93,074 Kookmin Bank and others Guarantees for supplemental funding(*1) — Korea Western Power Co., Ltd. Haemodum Solar Co., Ltd. Collateralized money invested KRW 3,081 Nonghyup Bank Korea Western Power Co., Ltd. Sam-Yang Photovoltaic Power Co., Ltd. Collateralized money invested KRW 4,993 Korea Development Bank Guarantees for supplemental funding(*1) — Korea Western Power Co., Ltd. Muan Solar Park Co., Ltd. Collateralized money invested KRW 6,083 IBK and others Korea Western Power Co., Ltd. Anjwa Smart Farm & Solar City Co., Ltd. Collateralized money invested KRW 6,784 Hana Bank and others Primary guarantor Principal obligor Type of guarantees Credit limit Creditor In millions of won Korea Western Power Co., Ltd. Seoroseoro Sunny Power Plant Co., Ltd. Collateralized money invested KRW 721 Hana Bank and others Guarantees for supplemental funding(*1) — Korea Western Power Co., Ltd. YuDang Solar Co., Ltd. Collateralized money invested KRW 565 Hana Bank and others Guarantees for supplemental funding(*1) — Korea Western Power Co., Ltd. Hapcheon Floating Photovoltaic Power Plant Inc. Collateralized money invested KRW 6,971 Nonghyup Bank and others Korea Western Power Co., Ltd. Yeongwol Eco Wind Co., Ltd. Collateralized money invested KRW 3,197 Hana Bank and others Guarantees for supplemental funding(*1) — Korea Western Power Co., Ltd. Gurae Resident Power Co., Ltd. Collateralized money invested Guarantees for supplemental funding(*1) KRW 396 — Hana Bank and others Korea Western Power Co., Ltd Gunsan Land Solar Co., Ltd. Collateralized money invested KRW 19,317 Hana Bank and others Guarantees for supplemental funding(*1) — Korea East-West Power Co., Ltd. Busan Shinho Solar Power Co., Ltd. Collateralized money invested KRW 5,841 Korea Development Bank Korea East-West Power Co., Ltd. Seokmun Energy Co., Ltd. Collateralized money invested KRW 13,842 Kookmin Bank and others Guarantees for supplemental funding(*1) — Korea East-West Power Co., Ltd. Chun-cheon Energy Co., Ltd. Collateralized money invested KRW 25,896 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 4,041 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 243,772 Korea Development Bank Korea East-West Power Co., Ltd. Yeonggwangbaeksu Wind Power Co., Ltd. Collateralized money invested KRW 2,728 Kookmin Bank and others Korea East-West Power Co., Ltd. Yeonggwang Wind Power Co., Ltd. Collateralized money invested KRW 17,646 KDB Capital Corporation Korea East-West Power Co., Ltd. Daesan Green Energy Co., Ltd. Collateralized money invested KRW 21,244 IBK Guarantees for supplemental funding(*1) KRW 18,989 Korea East-West Power Co., Ltd. Taebaek Gadeoksan Wind Power Co., Ltd. Collateralized money invested KRW 16,495 Hana Bank and others Guarantees for supplemental funding(*1) — Korea East-West Power Co., Ltd. PT. Tanjung Power Indonesia Debt guarantees USD 24,544 Sumitomo mitsui banking Other guarantees USD 3,150 PT. Adaro Indonesia Guarantees for supplemental funding(*1) — Sumitomo mitsui banking Collateralized money invested KRW 46,546 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 Collateralized money invested KRW 37,360 JCSD Trustee Services Korea East-West Power Co., Ltd. DE Energia SpA Collateralized money invested KRW 8,921 Mirae Asset Daewoo Co., Collateralized loans USD 5,728 Payment guarantees(*8) USD 950 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 5,465 Kyobo Life Insurance Co., Guarantees for supplemental funding(*1) — Korea East-West Power Co., Ltd. Busan Industrial Solar Power Co., Ltd. Collateralized money invested KRW 612 Shinhan Bank and others Guarantees for supplemental funding(*1) — Korea East-West Power Co., Ltd. Yangyang Wind Power Co., Ltd. Collateralized money invested KRW 11,191 Hana Bank and others Guarantees for supplemental funding(*1) — Korea East-West Power Co., Ltd. Daewon Green Energy Co., Ltd. Collateralized money invested KRW 3,877 Hana Bank and others G

Statement of Cash Flows

Statement of Cash Flows	12 Months Ended
	Dec. 31, 2021
Non Cash Transactions [Abstract]
Statement of Cash Flows	48. Statement of Cash Flows (1) Significant non-cash transactions for the years ended December 31, 2019, 2020, and 2021 are as follows: Transactions 2019 2020 2021 In millions of won Transfer from construction-in-progress to other assets ￦ 14,052,094 10,189,527 12,902,589 Recognition of asset retirement cost and related provision for decommissioning costs 2,425,668 895,507 2,356,805 Transfer from provision for disposal of spent nuclear fuel to accrued expenses 376,103 395,921 455,401 Transfer from long-term borrowings and debt securities to current portion of long-term borrowings and debt securities 7,759,284 9,237,883 11,109,271 Transfer from inventory to stored nuclear fuel 1,129,374 1,055,974 908,842 Transfer of right-of-use assets due to change in accounting policy and others 5,364,647 291,334 78,213 (2) Changes in liabilities incurred from financing activities for the years ended December 31, 2020, and 2021 are as follows: 2020 Non-cash changes Beginning Cash flows Increase Effect of fluctuations Ending balance In millions of won Borrowings and debt securities ￦ 67,876,541 2,538,787 — (690,747 ) 69,724,581 Lease liabilities 5,070,133 (613,977 ) 275,686 (110,746 ) 4,621,096 ￦ 72,946,674 1,924,810 275,686 (801,493 ) 74,345,677 2021 Non-cash changes Beginning Cash flows Increase Effect of fluctuations Ending balance 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

Commitments for Expenditure

Commitments for Expenditure	12 Months Ended
	Dec. 31, 2021
Commitments for Expenditure [Abstract]
Commitments for Expenditure	49. Commitments for Expenditure (1) The commitments related to 2020 2021 Contracts Commitment Remaining liability balances Commitment Remaining In millions of won Purchase of cable (PVC, 1C, 2000SQ) 153,000M and others (Shin-Bupyung-Youngseo) ￦ 56,574 16,038 57,046 16,240 Purchase of cable (PVC, 1C, 2500SQ) 103,374M and others (Bukdangjin-Shin-Tangjung) 45,390 32,876 46,616 34,102 Purchase of GIS (362kV, 6300A, 63kA) 23CB – Youngseo S/S 36,143 29,898 36,143 25,292 Purchase of GIS (362kV, 6300A, 63kA) 26CB – Hwasung S/S 40,010 8,328 40,010 5,540 Purchase of GIS (362kV, 6300A, 63kA) 27CB – Kwangyang S/S 37,744 2,244 37,744 140 Purchase of cable (FR CNCO-W, 1C, 325SQ) 1,400,000M 59,716 37,249 — — Purchase of switch (Eco) 9,360 units 40,631 24,031 — — Purchase of cable (TR CNCE-W,1C,600SQ) 551,200M 37,288 23,100 — — Purchase of cable (TR CNCE-W/AL,1C,400SQ) 4,464,000M 82,622 51,130 — — Purchase of cable (FR CNCO-W,1C,325SQ) 1,092,000M 42,068 35,358 — — Concrete pole (10M, general purpose, 350KGF) 102,435 ea and five other equipments 91,889 80,904 — — Purchase of cable (PVC, 1C, 2500SQ) 100,548M and others — — 56,860 34,576 Purchase of GIS (362kV, 6300A, 63kA) 25CB – Migeum S/S — — 32,000 26,700 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 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 Purchase of GIS (362KV, 6300A, 63KA) 25 – Shinyangsan S/S 31,464 31,464 Construction of Shin-Kori Units (#5,6) 8,625,387 3,256,117 9,800,424 3,479,667 Construction of Shin-Hanul Units (#1,2) 9,443,635 160,512 9,745,123 — Other 30 contracts 107,586 58,466 792,485 620,593 Service of designing Seoul Combined Units (#1,2) 31,841 984 31,841 934 Service of designing Shin-Boryeong Units (#1,2) 121,163 521 121,114 — Purchase of furnace for construction of Shin-Seocheon Thermal Power Plant 305,209 29,042 305,209 7,722 Purchase of turbine generator for construction of Shin-Seocheon Thermal Power Plant 105,226 8,279 105,226 6,301 Electricity construction of Shin-Seocheon Thermal Power Plant 282,234 13,524 340,356 — Purchase of main machine for Jeju LNG Combined 166,287 11,182 166,287 10,972 Service of designing Taean U 112,813 12,933 112,909 12,623 Purchase of gas turbines and turbine equipment of Gimpo Combined Heat & Power Plant 104,600 41,840 126,302 61,735 Purchase of steam turbine, HRSG and Popwer Block of Gimpo Combined Heat & Power Plant 210,900 147,630 214,053 138,244 Construction of Gimpo Combined Heat & Power Plant — — 130,015 86,323 Purchase of coal handling machine for construction of Samcheok Units (#1,2) 285,158 22,751 286,571 6,215 Purchase of furnace main equipment for construction of Samcheok Units (#1,2) 1,065,141 11,609 — — Purchase of turbine main equipment for Samcheok U 211,349 125 — — Purchase of main equipment for Namjeju 140,144 112 140,144 3 Purchase of main equipment for Shin-Sejong Combined Thermal Power Plant — — 234,392 200,122 (2) As of December 31, 2021, 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 2020 ~ 2030 32,435 Ton U3O8 Transformed 2020 ~ 2030 18,088 Ton U Enrichment 2020 ~ 2030 17,667 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 1,625 Ton U (contract periods : 2014 ~ 2024).

Contingencies and Commitments

Contingencies and Commitments	12 Months Ended
	Dec. 31, 2021
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, 2020 and 2021 are as follows: 2020 2021 Number Claim Number Claim In millions of won As the defendant 663 ￦ 550,535 683 ￦ 689,415 As the plaintiff 200 729,798 284 784,453 As of December 31, 2021, the Company is party to two ongoing litigations and one arbitration. A group of plaintiffs (consisting of 2,167 individuals) filed a lawsuit against NSSC (Nuclear Safety and Security Commission) regarding NSSC’s approval on May 18, 2015 of extending the operation of Wolsong unit 1 nuclear power plant. The appeal has been dismissed on May 29, 2020, resulting in plaintiffs’ loss. Also, Greenpeace and others filed an administrative litigation against NSSC requesting cancelation of the construction permit of Shin-Kori unit 5 and 6 in September 12, 2016 and lost the lawsuit in February 14, 2019. They appealed the case in March 18, 2019, but the appeal had been closed on April 29, 2021. The Company joined these litigations as a stakeholder after obtaining permission from the court. As of December 31, 2021, 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 cannot reliably estimate the potential economic outflow related to the obligation as of December 31, 2021. The Company is the defendant against a number of claims. The following is potentially significant ongoing claims pertaining to the Company: 1) There is an ongoing claim against the Company from a group of plaintiffs (consisting of 3,910 individuals) regarding the contribution to plan assets and payment of retirement benefits. The Company recognized ￦11,730 million as litigation provisions in relation to the lawsuit. 2) There is an ongoing claim against the Company regarding the completion of the waste oil refining power generation plant of Next energy Co., Ltd. The Company recognized the amount of probable outflow of resources as a provision. 3) 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 ￦3,233 million as litigation provisions in relation to the lawsuit as of December 31, 2021. In addition to the abovementioned significant ongoing claims, there are 5 arbitration cases pertaining to the Company as of December 31, 2021 and the significant arbitration cases for the year ended December 31, 2021 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) Two companies including GE Energy Products France SNC filed an arbitration against the Company to Korea Commercial Arbitration Board regarding additional payment of construction costs, but the Company has not recognized any provision because the probability of economic benefit outflow is remote and the related amount cannot be reliably estimated. (2) Guarantees of payments and commitments provided to other companies as of December 31, 2021 are as follows: 1) The Company has outstanding borrowings with a limit of USD 275,600 thousand from its creditors such as International Finance Corporation. Regarding the borrowing contract, the Company has guaranteed capital contribution of USD 69,808 thousand and additional contribution up to USD 19,000 thousand for contingencies, if any. Moreover, for one of the electricity purchasers, Central Power Purchasing Agency Guarantee Ltd., the Company has provided payment guarantee up to USD 2,777 thousand, in case of construction delay or insufficient contract volume after commencement of the construction. 2) The Company has provided PT. Perusahaan Listrik Negara performance guarantee up to USD 2,293 thousand and investment guarantee up to USD 43,500 thousand to Mizuho bank and others in proportion to its ownership in the electricity purchase contract with PT. Cirebon Energi Prasarana in relation to the second electric power generation business in Cirebon, Indonesia. 3) The Company has provided MUFG Bank, Ltd. (MUFG) borrowing guarantee up to USD 41,258 thousand in proportion to its ownership in the Equity Bridge Loan (EBL) guarantee with PT. Cirebon Energi Prasarana in relation to the second electric power generation business in Cirebon, Indonesia. 4) The Company has provided the Export-Import Bank of Korea, BNP Paribas and ING Bank with the guarantees of mutual investment of USD 2,192 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. 5) 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. 6) 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, 2021. 7) The Company has provided a guarantee to complete the construction of the waste oil refining power generation plant of Next energy Co.,Ltd. (contract amount : ￦14,700 million) to the financial institution agents, thus the Company is liable to compensate to financial institution agents for the any damages incurred in the event of incompletion of the construction. Also, the power generation guarantee agreement was concluded in connection with the consignment service for management and operations (the repayment period of the principal of the loan) after the completion of the construction. If the amount of power generated falls short of the contracted power generation amount, the Company will be liable to pay compensation for the shortage. The Company has recognized a provision based on the assessment of expected outflow of resources. 8) 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. 9) The Company has provided PT Perusahaan Listrik Negara a performance guarantee up to IDR 35,907,215 thousand for the implementation of Tanjung Jati power plant operation project in Indonesia. 10) The Company has provided Export-Import Bank of Korea and others a performance guarantee up to USD 12,090 thousand for the excess project costs of hydroelectric power generation project of Tanggamus, Indonesia. 11) The Company has provided Export-Import Bank of Korea and others a borrowing guarantee up to USD 5,911 thousand for the DSRA guarantee of hydroelectric power generation project of Tanggamus, Indonesia. 12) The Company has provided PT. Cirebon Energi Prasarana a performance guarantee up to USD 43,500 thousand for the fulfillment of subscription obligation regarding Cirebon 2 coal-fired power generation project in Indonesia. 13) 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. 14) The Company has provided Morgan Stanley Capital Group Inc. a performance guarantee up to USD 30,000 thousand for the implementation of photovoltaic power generation project in USA. 15) The Company has provided Morgan Stanley Renewables Inc. a performance guarantee up to USD 70,000 thousand for the fulfillment of subscription obligation regarding photovoltaic power generation project in USA. (2) Guarantees of payments and commitments provided to other companies as of December 31, 2021 are as follows, continued: 16) 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. 17) 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. 18) 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. 19) The Company has provided USD 60,000 thousand of a borrowing guarantee to Shinhan Bank, to guarantee the Equity Bridge Loan (EBL) for the solar power business in USA. 20) The Company has provided a performance guarantee to EDF Energy service, LLC, for the solar power business in USA. 21) The Company has provided USD 76,700 thousand of a performance guarantee to Primoris Renewable Energy, Inc., to guarantee the construction of power plants of the solar power business in USA. 22) The Company has provided USD 54,000 thousand of a performance guarantee to PT. Cirebon Electro Power, for Cirebon coal-fired power plant operation and maintenance project in Indonesia. (3) Credit lines provided by financial institutions as of December 31, 2021 are as follows: Commitments Financial institutions Currency Credit limit Used amount In millions of won and thousands of foreign currencies Commitments on Bank-overdraft Nonghyup Bank and others KRW 1,815,500 208,018 Commitments on Bank-daylight overdraft Nonghyup Bank KRW 280,000 — Limit amount available for CP Hana Bank and others KRW 1,050,000 1,050,000 Limit amount available for card Hana Bank and others Banco de Oro KRW PHP 47,404 5,529 Loan limit Kookmin Bank and others DBS Bank Ltd and others KRW USD 1,780,028 1,319,181 Certification of payment on payables from foreign country Nonghyup Bank USD 8,700 7,213 Certification of payment on L/C Shinhan Bank and others USD 1,019,834 463,355 Shinhan Bank JPY 707,337 — Hana Bank and others EUR 48,122 41,262 Certification of Performance guarantee on contract Seoul Guarantee Insurance and others KRW 104,705 96,658 First Abu Dhabi Bank and others USD 947,707 682,903 Korea Development Bank and others JPY 620,000 620,000 Hana Bank EUR 3,965 3,965 Shinhan Bank INR 51,678 51,678 Certification of bidding Hana Bank USD 5,200 197 Advance payment bond, Warranty bond, Retention bond and others Seoul Guarantee Insurance KRW 49,874 49,874 Hana Bank and others USD 331,072 286,388 Hana Bank SAR 6,508 6,508 Hana Bank and others MXN 21,597 20,027 Others Nonghyup Bank and others KRW 610,983 29,730 Export-Import Bank of Korea and others USD 2,625,372 1,842,173 Standard Chartered AED 50 50 Inclusive credit Hana Bank KRW 8,000 825 Hana Bank and others USD 135,078 15,633 Trade finance Export-Import Bank of Korea and others USD 850,000 149,328 (4) As of December 31, 2021, blank check and assets provided as collaterals or pledges to financial institutions by the Company are follows: Guarantor Creditor Assets provided as security Currency Amount Description In millions of won and thousands of foreign currencies Mira Power Limited International Finance Corporation and others 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 396,120 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 236,570 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 debt securities(*1) Incheon Fuel Cell Co., Ltd. Kookmin Bank and others Cash and cash equivalents and others KRW 276,960 Collateral for borrowings(*2) TS Energy No. 25 Co., Ltd. Kyobo Life Insurance Co., Ltd. and others Property, plant and equipment and others KRW 521,281 Collateral for borrowings(*2) Jeongam Wind Power Co., Ltd. KDB Capital Corporation and others Cash and cash equivalents and others KRW 221,631 Collateral for borrowings(*2) (*1) Based on the credit limits of the respective loans. (*2) As of December 31, 2021, 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, 2021. The Company has provided blank check as a repayment guarantee. (5) The Company temporarily suspended operations of the Gangneung hydroelectric generating plant, with a carrying amount of ￦68,674 million as of December 31, 2021, to improve the quality of water used in generating electricity. The expenses related to the suspension of operations of ￦44 million and depreciation on the idle assets of ￦3,621 million are recorded in other expenses for the year ended December 31, 2021. Regarding the improvement of water quality, the results of damages compensation for the local residents cannot be reasonably estimated, and the Company is in negotiations with Gangneung City and related stakeholders to restart the Gangneung hydroelectric generating plant as of December 31, 2021. (6) Due to the Korean government’s announcement of suspension of operation in the Gaeseong Industrial District, it is uncertain if the Company can exercise the property rights for the Company’s facility in the Gaeseong Industrial District as of December 31, 2021. The book value of facility is ￦14,451 million and the amount of trade receivables related to the companies residing in Gaeseong industrial complex is ￦2,911 million. The outcome of this event cannot be reasonably estimated as of December 31, 2021. (7) In connection with the electric power IT modernization project in Kerala, India, negotiations are underway due to disagreements in the contract regarding the existence and the scope of a warranty obligation. However, the Company has not recognized any provision because the amount and timing of economic benefit outflow cannot be reasonably estimated as of December 31, 2021. (8) To prevent the spread of COVID-19, a variety of prevention and control measures, including movement restrictions, are being implemented worldwide, and as a result, the global economy is being affected extensively. In addition, various forms of government policies are being announced to cope with COVID-19. The Company was unable to reasonably estimate the impact of COVID-19 and the impact of the government support policies on the Company’s consolidated financial statements as of December 31, 2021, and the resulting effects have not been reflected in the consolidated financial statements. (9) The Korea Institute of Energy Technology

Business Combination

Business Combination	12 Months Ended
	Dec. 31, 2021
Disclosure of detailed information about business combination [abstract]
Business Combination	51. Business Combination (1) Details of the business combination that occurred for the year ended December 31, 2019 are as follows: Company Key operation Date of Transfer In millions of won Eumseong Natural Gas Power Co., Ltd. Power generation 2019.12.23 225,758 Eumseong Natural Gas Power Co., Ltd. was established in August 2019 by spin-off from Dangjin Eco Power Co., Ltd., and obtained the license for LNG combined power generation under the 8th Basic Plan for Long-Term Electricity Supply and Demand. Korea East-West Power Co., Ltd., a subsidiary of the Company, acquired 100% of its interest in Eumseong Natural Gas Power Co., Ltd. for stable power supply and profit generation through diversification of power sources, and merged with Eumseong Natural Gas Power Co., Ltd. on December 23, 2019. (2) Details of the transfer price at fair value given by the acquirer of the business combination for the year ended December 31, 2019 are as follows: Type Amounts In millions of won Cash and cash equivalents(*) ￦ 166,700 Fair value of the shares owned before the acquisition 59,058 ￦ 225,758 (*) The outstanding payment of ￦10,000 million as of December 31, 2019, has been received during the current year. (3) The fair values of assets and liabilities acquired through the business combination at the acquisition date for the year ended December 31, 2019 are as follows: Type Amounts In millions of won Fair value of the identifiable assets Current assets Cash and cash equivalents ￦ 2,389 Trade and other receivables 55 Non-current assets Property, plant and equipment 54 Intangible assets 172,434 Other assets 60 Fair value of the identifiable liabilities Current liabilities Borrowings (2,900 ) Non-current liabilities Deferred tax liabilities (41,729 ) ￦ 130,363 (4) Details of goodwill resulting from the business combination for the year ended December 31, 2019 are as follows: Type Amounts In millions of won Fair value of transfer price ￦ 225,758 Less : Fair value of the identifiable net assets (130,363 ) ￦ 95,395 Goodwill arose from the business combination due to the transfer price including the premium to obtain control paid in order to acquire Eumseong Natural Gas Power Co., Ltd. It also includes expectation of synergy effect and future growth in profits derived from business combination with LNG combined power generation project. These business rights can be separated from goodwill which satisfies the recognition requirements and thus the business rights have been recognized as a separate intangible asset. On the contrary, the expected benefits such as direct fuel acquisition and reduce costs for O&M did not satisfy the recognition requirements for identifiable intangible assets and thus were not recognized separately from the goodwill. (5) Net cash outflows from the business combination for the years ended December 31, 2019 and 2020 are as follows: Type 2019 2020 In millions of won Cash paid for the acquisition ￦ 156,700 10,000 Less: Cash and cash equivalents received (2,389 ) — ￦ 154,311 10,000 (6) Fees for legal service, due diligence and others relating to the business combination amounted to 24 million. The fees were excluded from the transfer price and recognized as selling and administrative expenses in the statement of comprehensive income (loss) for the year ended December 31, 2019. (7) There is no sale or net profit included in the statement of comprehensive income (loss) for the year ended December 31, 2019, in relation to additional business launched by Eumseong Natural Gas Power Co., Ltd.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2021
Disclosure of non-adjusting events after reporting period [abstract]
Subsequent Events	52. Subsequent Events (1) Subsequent to December 31, 2021, the Company and its subsidiaries including 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. and Korea East-West Power Co., Ltd. issued corporate bonds for the purposes of repayment of existing debts and others as follows: Company Type Issue date Maturity Interest rate Amount In millions of won and thousands of USD Korea Electric Power Corporation #1117 Corporate bond 2022.01.04 2025.01.04 2.33 % KRW 150,000 #1118 Corporate bond 2022.01.04 2027.01.04 2.53 % KRW 200,000 #1119 Corporate bond 2022.01.06 2029.01.06 2.75 % KRW 200,000 #1120 Corporate bond 2022.01.06 2032.01.06 2.83 % KRW 100,000 #1121 Corporate bond 2022.01.10 2025.01.10 2.50 % KRW 270,000 #1122 Corporate bond 2022.01.10 2029.01.10 2.83 % KRW 200,000 #1123 Corporate bond 2022.01.12 2027.01.12 2.69 % KRW 280,000 #1124 Corporate bond 2022.01.12 2032.01.12 2.90 % KRW 120,000 #1125 Corporate bond 2022.01.19 2025.01.19 2.58 % KRW 160,000 #1126 Corporate bond 2022.01.19 2029.01.19 2.92 % KRW 100,000 #1127 Corporate bond 2022.01.25 2027.01.25 2.80 % KRW 150,000 #1128 Corporate bond 2022.01.25 2032.01.25 2.98 % KRW 100,000 #1129 Corporate bond 2022.01.27 2025.01.27 2.70 % KRW 190,000 #1130 Corporate bond 2022.01.27 2029.01.27 2.99 % KRW 140,000 #1131 Corporate bond 2022.02.04 2027.02.04 2.97 % KRW 190,000 #1132 Corporate bond 2022.02.04 2032.02.04 3.05 % KRW 160,000 #1133 Corporate bond 2022.02.08 2025.02.08 2.80 % KRW 150,000 #1134 Corporate bond 2022.02.08 2029.02.08 3.10 % KRW 140,000 #1135 Corporate bond 2022.02.10 2027.02.10 3.03 % KRW 300,000 #1136 Corporate bond 2022.02.10 2032.02.10 3.17 % KRW 70,000 #1137 Corporate bond 2022.02.14 2025.02.14 2.89 % KRW 200,000 #1138 Corporate bond 2022.02.14 2029.02.14 3.19 % KRW 90,000 #1139 Corporate bond 2022.02.18 2025.02.18 2.86 % KRW 180,000 #1140 Corporate bond 2022.02.18 2027.02.18 3.08 % KRW 110,000 #1141 Corporate bond 2022.02.22 2025.02.22 2.93 % KRW 160,000 #1142 Corporate bond 2022.02.22 2027.02.22 3.15 % KRW 130,000 #1143 Corporate bond 2022.02.25 2025.02.25 2.82 % KRW 120,000 #1144 Corporate bond 2022.02.25 2027.02.25 3.09 % KRW 40,000 #1145 Corporate bond 2022.03.02 2025.03.02 2.85 % KRW 150,000 #1146 Corporate bond 2022.03.02 2027.03.02 3.12 % KRW 160,000 #1147 Corporate bond 2022.03.04 2025.03.04 2.84 % KRW 190,000 #1148 Corporate bond 2022.03.04 2027.03.04 3.12 % KRW 90,000 #1149 Corporate bond 2022.03.04 2029.03.04 3.15 % KRW 20,000 #1150 Corporate bond 2022.03.07 2025.03.07 2.82 % KRW 160,000 #1151 Corporate bond 2022.03.07 2027.03.07 3.11 % KRW 90,000 #1152 Corporate bond 2022.03.07 2029.03.07 3.15 % KRW 50,000 #1153 Corporate bond 2022.03.10 2025.03.10 2.88 % KRW 170,000 #1154 Corporate bond 2022.03.10 2027.03.10 3.10 % KRW 130,000 #1155 Corporate bond 2022.03.16 2025.03.16 2.89 % KRW 210,000 #1156 Corporate bond 2022.03.16 2027.03.16 3.10 % KRW 130,000 #1157 Corporate bond 2022.03.18 2025.03.18 2.93 % KRW 180,000 #1158 Corporate bond 2022.03.18 2027.03.18 3.09 % KRW 180,000 #1159 Corporate bond 2022.03.24 2024.03.24 2.73 % KRW 160,000 #1160 Corporate bond 2022.03.24 2027.03.24 3.29 % KRW 80,000 #1161 Corporate bond 2022.03.28 2052.03.28 3.30 % KRW 130,000 #1162 Corporate bond 2022.03.30 2024.03.30 3.01 % KRW 100,000 #1163 Corporate bond 2022.03.30 2025.03.30 3.35 % KRW 60,000 #1164 Corporate bond 2022.03.30 2027.03.30 3.49 % KRW 30,000 #1165 Corporate bond 2022.04.01 2024.04.01 3.07 % KRW 150,000 #1166 Corporate bond 2022.04.01 2025.04.01 3.45 % KRW 160,000 #1167 Corporate bond 2022.04.01 2032.04.01 3.50 % KRW 10,000 #1168 Corporate bond 2022.04.05 2024.04.05 3.19 % KRW 130,000 #1169 Corporate bond 2022.04.05 2025.04.05 3.46 % KRW 70,000 #1170 Corporate bond 2022.04.05 2027.04.05 3.61 % KRW 70,000 #1171 Corporate bond 2022.04.07 2024.04.07 3.36 % KRW 100,000 #1172 Corporate bond 2022.04.07 2025.04.07 3.58 % KRW 50,000 #1173 Corporate bond 2022.04.07 2027.04.07 3.70 % KRW 20,000 #1174 Corporate bond 2022.04.11 2024.04.11 3.65 % KRW 160,000 #1175 Corporate bond 2022.04.11 2025.04.11 3.71 % KRW 40,000 #1176 Corporate bond 2022.04.11 2027.04.11 3.84 % KRW 10,000 #1177 Corporate bond 2022.04.15 2024.04.15 3.55 % KRW 230,000 (1) Subsequent to December 31, 2021, the Company and its subsidiaries including 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. and Korea East-West Power Co., Ltd. issued corporate bonds for the purposes of repayment of existing debts and others as follows, continued: Company Type Issue date Maturity Interest rate Amount In millions of won and thousands of USD Korea Electric Power Corporation #1178 Corporate bond 2022.04.15 2025.04.15 3.70 % KRW 60,000 #1179 Corporate bond 2022.04.15 2027.04.15 3.72 % KRW 10,000 #1180 Corporate bond 2022.04.19 2023.10.19 3.29 % KRW 230,000 #1181 Corporate bond 2022.04.19 2025.04.19 3.70 % KRW 80,000 #1182 Corporate bond 2022.04.21 2023.10.21 3.19 % KRW 200,000 #1183 Corporate bond 2022.04.21 2025.04.21 3.71 % KRW 150,000 #1184 Corporate bond 2022.04.21 2052.04.21 3.72 % KRW 100,000 #1185 Corporate bond 2022.04.26 2024.04.26 3.30 % KRW 130,000 #1186 Corporate bond 2022.04.26 2025.04.26 3.65 % KRW 130,000 #1187 Corporate bond 2022.04.26 2027.04.26 3.77 % KRW 60,000 #1188 Corporate bond 2022.04.28 2024.04.28 3.35 % KRW 210,000 #1189 Corporate bond 2022.04.28 2025.04.28 3.70 % KRW 260,000 #1190 Corporate bond 2022.04.28 2027.04.28 3.77 % KRW 30,000 Korea Hydro & Nuclear Power Co., Ltd. #63-1 Corporate bond 2022.02.17 2027.02.17 2.81 % KRW 40,000 #63-2 Corporate bond 2022.02.17 2042.02.17 3.04 % KRW 60,000 #63-3 Corporate bond 2022.02.17 2052.02.17 2.97 % KRW 50,000 #64-1 Corporate bond 2022.03.11 2042.03.11 3.10 % KRW 70,000 #64-2 Corporate bond 2022.03.11 2052.03.11 3.02 % KRW 80,000 #65-1 Corporate bond 2022.04.22 2027.04.22 3.68 % KRW 30,000 #65-2 Corporate bond 2022.04.22 2042.04.22 3.84 % KRW 60,000 #65-3 Corporate bond 2022.04.22 2052.04.22 3.72 % KRW 20,000 Korea South-East Power Co., Ltd. Corporate bond 2022.03.28 2027.03.28 3.30 % KRW 10,000 Corporate bond 2022.03.28 2052.03.28 3.13 % KRW 40,000 Corporate bond 2022.03.28 2025.03.28 3.24 % KRW 90,000 Korea Midland Power Co., Ltd. #65-1 non-guaranteedCorporate bond 2022.01.17 2032.01.17 2.85 % KRW 10,000 #65-2 non-guaranteedCorporate bond 2022.01.17 2042.01.17 2.83 % KRW 10,000 #66-1 non-guaranteedCorporate bond 2022.01.24 2025.01.24 2.83 % KRW 40,000 #66-2 non-guaranteedCorporate bond 2022.01.24 2027.01.24 2.95 % KRW 30,000 #66- 3 2022.01.24 2052.01.24 2.87 % KRW 50,000 #67 non-guaranteedCorporate bond 2022.02.17 2052.02.17 3.01 % KRW 40,000 #9 Foreign currencyCorporate bond 2022.04.21 2027.04.21 3.63 % USD 300,000 Korea Western Power Co., Ltd. #51-1 Corporate bond 2022.01.25 2025.01.24 2.76 % KRW 50,000 #51-2 Corporate bond 2022.01.25 2042.01.24 2.78 % KRW 20,000 #52-1 Corporate bond 2022.03.28 2025.03.28 3.18 % KRW 90,000 #52-2 Corporate bond 2022.03.28 2042.03.28 3.35 % KRW 30,000 #52-3 Corporate bond 2022.03.28 2052.03.28 3.20 % KRW 10,000 Korea Southern Power Co., Ltd. Corporate bond 2022.03.24 2025.03.24 3.13 % KRW 40,000 Corporate bond 2022.03.24 2042.03.24 3.29 % KRW 60,000 Corporate bond 2022.04.26 2025.04.26 3.63 % KRW 160,000 Corporate bond 2022.04.26 2025.04.26 3.63 % KRW 10,000 Corporate bond 2022.04.26 2052.04.26 3.60 % KRW 20,000 Korea East-West Power Co., Ltd. Corporate bond 2022.04.22 2025.04.22 3.75 % KRW 60,000 (2) The Company established the right of pledge on the shares of Jeju Hanlim Offshore Wind Co., Ltd. with other shareholders to procure project financing of Jeju Hanlim Offshore Wind Co., Ltd. which is a subsidiary of the Company on February 25, 2022. (3) The ongoing armed conflict between Russia and Ukraine in the territory of Ukraine, which started in February 2022, and relevant sanctions against Russia and Belarus imposed by the international community can impact not only sanctioned entities of Russia and Belarus but also the entities doing business directly or indirectly with Ukraine, Russia or Belarus and the entities exposed directly or indirectly to industries or economy of those countries. The Company has accounted for the event as a non-adjusting event after the reporting period. The Company is unable to make reasonable estimates of the future financial impact of the Ukraine-Russia conflict on the Company’s financial position or performance.

Basis of Preparation (Policies)

Basis of Preparation (Policies)	12 Months Ended
	Dec. 31, 2021
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, 2020 and 2021 are ￦1,691,294 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) Early shutdown of the Wolsong Unit 1 nuclear power plant and changes in new nuclear power plants construction The 30-year According to the Eighth Basic Plan for Electricity Supply and Demand announced by the Ministry of Trade, Industry and Energy in 2017, the 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, decided to shut down the 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, the NSSC approved permanent shutdown of the Wolsong Unit 1. In addition, the Company has also decided to discontinue the construction of the Cheonji Unit 1 and 2 and Daejin Unit 1 and 2 pursuant to the Korean government’s energy transformation 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, the Shin-Hanwool 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 the Shin-Hanwool 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. In relation to the Korean government’s nuclear phase-out plan pursuant to its energy transformation policy, the Korean government has established a legal basis and relevant procedures to make up for the Company’s losses relating to the decommissioning of the nuclear power plants to be achieved in stages. As of December 31, 2021, there is no indication that the above-mentioned impairment has ceased to exist or reduced. 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 Changes in accounting standards effective from January 1, 2021 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, 2021, even though the early adoption of these standards is possible. Amendments to IFRS 9 ’Financial Instruments’, IAS 39 ‘Financial Instruments: Recognition and Measurement’, IFRS 7 ‘Financial Instruments: Disclosures’, IFRS 4 ‘Insurance Contracts’ and IFRS 16 ‘ Leases’ The amendments provide temporary reliefs which address the financial reporting effects when an interbank offered rate (IBOR) is replaced with an alternative nearly risk-free interest rate (RFR). The amendments include the following practical expedients: • A practical expedient to require contractual changes, or changes to cash flows that are directly required by the reform, to be treated as changes to a floating interest rate, equivalent to a movement in a market rate of interest • Permit changes required by IBOR reform to be made to hedge designations and hedge documentation without the hedging relationship being discontinued • Provide temporary relief to entities from having to meet the separately identifiable requirement when an RFR instrument is designated as a hedge of a risk component

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2021
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 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
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 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 as solar, wind and biomass.
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-sale 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, 2021
Reporting Entity (Description of the controlling company) [Abstract]
Summary of the Company's Shareholders	As of December 31, 2021, KEPCO’s share capital amounts to W follows: Number of Percentage of ownership The Government of the Republic of Korea 116,841,794 18.20 % Korea Development Bank (KDB) 211,235,264 32.90 % Foreign investors 91,105,897 14.19 % Other 222,781,122 34.71 % 641,964,077 100.00 %

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2021
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 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, 2021
Disclosure of operating segments [abstract]
Summary of Financial Information of the Segments	(2) Financial information of the segments for the years ended December 31, 2019, 2020 and 2021, respectively, are as follows: 2019 Segment Total segment Intersegment Revenue Depreciation Interest Interest Profit Employee Loss on Increase in Operating In millions of won Transmission and distribution ￦ 58,328,372 1,336,725 56,991,647 3,814,428 73,478 777,120 140,757 298,144 350,865 987,828 (2,568,529 ) Electric power generation (Nuclear) 8,937,026 8,908,803 28,223 3,227,695 37,277 511,864 (5,497 ) 132,283 — 672,134 782,511 Electric power generation (Non-nuclear) 24,254,957 23,472,153 782,804 3,955,333 35,626 655,466 77,641 163,626 13,364 766,407 551,287 Plant maintenance & engineering service 2,627,539 2,254,841 372,698 125,546 14,214 2,861 1,237 124,745 — 124,242 312,341 Others 1,049,324 656,614 392,710 127,364 141,262 134,248 — 18,409 4 2,408 (489,585 ) Consolidation adjustments (36,629,136 ) (36,629,136 ) — (121,626 ) (33,739 ) (34,748 ) — (12,087 ) — (251,804 ) (295,552 ) ￦ 58,568,082 — 58,568,082 11,128,740 268,118 2,046,811 214,138 725,120 364,233 2,301,215 (1,707,527 ) Finance income 1,009,706 Finance expense (2,782,156 ) Gain related to associates, joint ventures and subsidiaries 214,139 Loss before income tax ￦ (3,265,838 ) 2020 Segment Total segment Intersegment Revenue Depreciation Interest Interest Profit (loss) Employee Loss on Increase in Operating In millions of won Transmission and distribution ￦ 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 1,582,001 1,096,663 485,338 122,092 167,005 162,843 — 50,889 940 3,711 148,393 Consolidation adjustments (33,974,121 ) (33,974,121 ) — (127,628 ) (30,852 ) (32,472 ) — (49,605 ) — (169,651 ) (291,187 ) ￦ 57,925,837 — 57,925,837 11,548,019 242,586 1,995,425 281,107 492,288 255,346 1,832,765 4,096,620 Finance income 1,510,249 Finance expense (2,896,443 ) Gain related to associates, joint ventures and subsidiaries 281,107 Loss before income tax ￦ 2,991,533 2021 Segment Total segment Intersegment Revenue Depreciation Interest Interest Profit (loss) Employee Loss on Increase in Operating 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) 25,837,982 24,518,167 1,319,815 4,178,520 22,226 624,391 109,765 121,020 5,672 285,152 364,572 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 2,010,843 1,295,423 715,420 158,952 158,680 162,345 — 52,698 — 2,981 200,363 Consolidation adjustments (39,064,782 ) (39,064,782 ) — (122,751 ) (27,587 ) (29,710 ) — (36,187 ) — 89,818 (64,775 ) ￦ 59,913,607 — 59,913,607 11,938,272 221,874 1,914,457 494,584 511,942 207,934 2,466,452 (5,736,635 ) Finance income 1,402,614 Finance expense (3,245,777 ) Gain related to associates, joint ventures and subsidiaries 494,584 Profit before income tax ￦ (7,085,214 )
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, 2020 and 2021 are as follows: 2020 Segment Segment assets Investments Acquisition of non-current Segment In millions of won Transmission and distribution ￦ 113,115,667 4,204,090 6,535,380 59,772,046 Electric power generation (Nuclear) 61,850,865 116,867 2,419,939 35,652,467 Electric power generation (Non-nuclear) 54,531,155 1,807,409 3,758,795 33,292,680 Plant maintenance & engineering service 3,492,571 42,167 141,226 1,061,949 Others 8,923,046 — 577,056 4,039,220 Segment totals 241,913,304 6,170,533 13,432,396 133,818,362 Consolidation adjustments: Elimination of inter-segment amounts (39,762,888 ) — (30,731 ) (6,749,728 ) Equity method adjustment 1,372,001 — — — Deferred taxes 47,664 — — 5,417,629 Others (427,970 ) — — (10,998 ) (38,771,193 ) — (30,731 ) (1,343,097 ) Consolidated totals ￦ 203,142,111 6,170,533 13,401,665 132,475,265 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) 57,304,296 2,575,019 3,331,813 35,803,289 Plant maintenance & engineering service 3,672,366 53,617 110,330 1,086,926 Others 10,861,823 — 637,715 4,961,880 Segment totals 252,045,653 7,471,384 12,793,635 148,745,359 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 ￦ 211,108,870 7,471,384 12,781,634 145,797,021
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 assets is determined by the location of the customers and of the assets: Revenue from external customers Non-current assets (*2) Geographical unit 2019 2020 2021 2019 2020 2021 In millions of won Domestic ￦ 56,942,128 56,774,578 58,672,484 169,366,365 173,673,478 178,745,707 Overseas (*1) 1,625,954 1,151,259 1,241,123 2,743,755 2,831,925 3,572,784 ￦ 58,568,082 57,925,837 59,913,607 172,110,120 176,505,403 182,318,491 (*1) Middle East and other Asian countries make up the majority of overseas revenue and non-current assets. Since the overseas revenue or non-current assets attributable to particular countries are not material, they are not disclosed individually. (*2) The amounts exclude financial assets and deferred tax assets.
Summary of 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, 2019, 2020 and 2021.

Classification of Financial I_2

Classification of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2021
Disclosure of detailed information about financial instruments [abstract]
Classification of financial assets	(1) Classification of financial assets as of December 31, 2020 and 2021 are as follows: 2020 Financial assets Financial assets Financial assets Derivative assets Total In millions of won Current assets Cash and cash equivalents ￦ — — 2,029,584 — 2,029,584 Current financial assets Current financial assets at fair value through profit or loss 1,196,101 — — — 1,196,101 Current financial assets at amortized costs — — 13,149 — 13,149 Current derivative assets 18,332 — — 11,193 29,525 Other financial assets — — 1,561,445 — 1,561,445 Trade and other receivables — — 7,918,470 — 7,918,470 1,214,433 — 11,522,648 11,193 12,748,274 Non-current assets Non-current financial assets Non-current financial assets at fair value through profit or loss 685,281 — — — 685,281 Non-current financial assets at fair value through other comprehensive income — 358,559 — — 358,559 Non-current financial assets at amortized costs — — 1,273 — 1,273 Non-current derivative assets 92,432 — — 44,456 136,888 Other financial assets — — 1,290,820 — 1,290,820 Trade and other receivables — — 1,861,569 — 1,861,569 777,713 358,559 3,153,662 44,456 4,334,390 ￦ 1,992,146 358,559 14,676,310 55,649 17,082,664 2021 Financial assets Financial assets Financial assets Derivative assets 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 assets Non-current financial assets Non-current financial assets at fair value through profit or loss 672,031 — — — 672,031 Non-current financial assets at fair value through other comprehensive income — 435,107 — — 435,107 Non-current financial assets at amortized costs — — 9,851 — 9,851 Non-current derivative assets 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
Classification of financial liabilities	(2) Classification of financial liabilities as of December 31, 2020 and 2021 are as follows: 2020 Financial liabilities at fair value through profit or loss Financial liabilities Derivative liabilities Total In millions of won Current liabilities Borrowings ￦ — 2,113,181 — 2,113,181 Debt securities — 8,561,624 — 8,561,624 Derivative liabilities 13,053 — 36,831 49,884 Trade and other payables — 6,256,521 — 6,256,521 13,053 16,931,326 36,831 16,981,210 Non-current liabilities Borrowings — 3,003,999 — 3,003,999 Debt securities — 56,045,777 — 56,045,777 Derivative liabilities 144,873 — 170,362 315,235 Trade and other payables — 6,480,412 — 6,480,412 144,873 65,530,188 170,362 65,845,423 ￦ 157,926 82,461,514 207,193 82,826,633 2021 Financial liabilities at fair value through profit or loss Financial liabilities Derivative liabilities 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 liabilities 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
Classification of comprehensive income (loss) from financial instruments	KOREA ELECTRIC POWER CORPORATION AND SUBSIDIARIES Notes to the Consolidated Financial Statements, Continued December 31, 2020 and 2021 5. Classification of Financial Instruments, Continued (3) Classification of comprehensive income (loss) from financial instruments for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Cash and cash equivalents Interest income ￦ 42,861 9,419 12,692 Gain (loss) on foreign currency transactions and translations (3,332 ) (15,911 ) 34,923 Financial assets at fair value through profit or loss Interest income 29,411 19,114 18,415 Dividends income 6,984 4,734 2,949 Gain (loss) on valuation of derivatives 151,604 (52,447 ) 450,896 Gain (loss) on transaction of derivatives 63,329 36,563 54,352 Gain (loss) on valuation of financial assets 1,062 5,508 8,858 Gain (loss) on disposal of financial assets 1,760 11,344 4,221 Financial assets at fair value through other comprehensive income Dividends income 6,854 2,582 7,573 Financial assets at amortized cost Interest income 539 612 797 Gain (loss) on foreign currency transactions and translations (690 ) (1,733 ) (3,647 ) Loans Interest income 63,448 26,232 25,196 Gain (loss) on foreign currency transactions and translations (631 ) (527 ) 729 Trade and other receivables Interest income 69,941 151,035 144,543 Gain (loss) on disposal of financial assets — — 2,452 Gain (loss) on foreign currency transactions and translations (31,500 ) 23,458 14,207 Short-term financial instruments Interest income 49,070 25,540 7,531 Gain (loss) on foreign currency transactions and translations 39,845 (38,088 ) 32,218 Long-term financial instruments Interest income 12,794 10,406 12,470 Gain (loss) on foreign currency transactions and translations — — 27 Other financial assets Interest income 54 228 230 Derivatives (applying hedge accounting) Gain (loss) on valuation of derivatives (profit or loss) 123,730 (77,733 ) 211,180 Gain (loss) on valuation of derivatives (equity, before tax) 38,305 9,925 (11,734 ) Gain (loss) on transaction of derivatives 65,651 36,053 31,351 Financial liabilities at fair value through profit or loss Gain (loss) on valuation of derivatives 27,686 (104,607 ) 2,751 Gain (loss) on transaction of derivatives (493 ) (49,788 ) (15,358 ) Financial liabilities carried at amortized cost Interest expense of borrowings and debt securities 1,394,328 1,365,801 1,316,269 Gain (loss) on repayment of financial liabilities — (35 ) (10 ) Interest expense of trade and other payables 94,019 88,757 213,765 Interest expense of others 558,464 540,867 384,423 Other finance income — — 1,284 Other finance expenses — — 2,504 Gain (loss) on foreign currency transactions and translations (409,867 ) 772,045 (1,162,835 ) Derivatives (applying hedge accounting) Gain (loss) on valuation of derivatives (profit or loss) 14,330 (220,928 ) 158,167 Gain (loss) on valuation of derivatives (equity, before tax) (2,578 ) 101,295 (28,726 ) Gain (loss) on transaction of derivatives (42,072 ) 42,565 13,737

Restricted Deposits (Tables)

Restricted Deposits (Tables)	12 Months Ended
	Dec. 31, 2021
Restricted Deposits [Abstract]
Restricted Deposits	Restricted deposits as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Cash and cash equivalents Escrow accounts ￦ 544 — Deposits for government project and others 5,066 22,286 Collateral provided for borrowings 117,747 264,813 Collateral provided for lawsuit 42 42 Deposits for transmission regional support program 5,469 5,921 Deposits for other business purposes — 3,050 Short-term financial instruments Restriction on withdrawal related to ‘win-win growth program’ for small and medium enterprises and others 109,000 114,000 Collateral provided for borrowings — 11,745 Non-current financial assets at fair value through profit or loss Decommissioning costs of nuclear power plants 577,481 531,720 Long-term financial instruments Escrow accounts 76 70 Guarantee deposits for banking accounts at oversea branches 306 333 Collateral provided for borrowings 11,745 — Decommissioning costs of nuclear power plants 258,282 324,609 Funds for developing small and medium enterprises (*) 210,000 10,000 ￦ 1,295,758 1,288,589 (*) As of December 31, 2020, it consisted of the deposits for small and medium enterprises at the Industrial Bank of Korea (IBK) and others for construction of Bitgaram Energy Valley and support for high potential businesses amounting to ￦200,000 million and the deposits were returned during the year ended December 31, 2021.

Cash and Cash Equivalents (Tabl

Cash and Cash Equivalents (Tables)	12 Months Ended
	Dec. 31, 2021
Cash and cash equivalents [abstract]
Cash and Cash Equivalents	Cash and cash equivalents as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Cash ￦ 871 19,623 Other demand deposits 1,291,058 1,825,751 Short-term deposits classified as cash equivalents 432,263 407,921 Short-term investments classified as cash equivalents 305,392 381,943 ￦ 2,029,584 2,635,238

Trade and Other Receivables (Ta

Trade and Other Receivables (Tables)	12 Months Ended
	Dec. 31, 2021
Trade and other receivables [abstract]
Trade and Other Receivables	(1) Trade and other receivables as of December 31, 2020 and 2021 are as follows: 2020 Gross Allowance for doubtful accounts Present value discount Book In millions of won Current assets Trade receivables ￦ 7,370,923 (208,184 ) — 7,162,739 Other receivables 799,598 (42,332 ) (1,535 ) 755,731 8,170,521 (250,516 ) (1,535 ) 7,918,470 Non-current assets Trade receivables 227,261 (806 ) — 226,455 Other receivables 1,728,486 (90,047 ) (3,325 ) 1,635,114 1,955,747 (90,853 ) (3,325 ) 1,861,569 ￦ 10,126,268 (341,369 ) (4,860 ) 9,780,039 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 assets 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
Other receivables	(2) Other receivables as of December 31, 2020 and 2021 are as follows: 2020 Gross Allowance for doubtful accounts Present value Book In millions of won Current assets Non-trade receivables ￦ 441,031 (37,062 ) — 403,969 Accrued income 38,956 — — 38,956 Deposits 239,011 — (1,535 ) 237,476 Finance lease receivables(*1) 57,084 (365 ) — 56,719 Others 23,516 (4,905 ) — 18,611 799,598 (42,332 ) (1,535 ) 755,731 Non-current assets Non-trade receivables 215,136 (80,451 ) — 134,685 Accrued income 834 — — 834 Deposits 364,855 — (3,325 ) 361,530 Finance lease receivables(*2) 1,065,982 (625 ) — 1,065,357 Others 81,679 (8,971 ) — 72,708 1,728,486 (90,047 ) (3,325 ) 1,635,114 ￦ 2,528,084 (132,379 ) (4,860 ) 2,390,845 (*1)  Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of ￦105,127 million. (*2)  Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of ￦1,087,559 million.       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. (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.
Aging analysis of trade receivables	(4) Aging analysis of trade receivables as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Trade receivables: (not overdue) ￦ 7,274,773 7,603,472 Trade receivables: (impairment reviewed) 323,411 325,775 Less than 60 days 3,505 11,577 60 ~ 90 days 28,729 27,201 90 ~ 120 days 10,687 28,230 120 days ~ 1 year 34,036 51,945 Over 1 year 246,454 206,822 7,598,184 7,929,247 Less: allowance for doubtful accounts (208,990 ) (205,339 ) ￦ 7,389,194 7,723,908
Aging analysis of other receivables	(5) Aging analysis of other receivables as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Other receivables: (not overdue) ￦ 2,363,967 2,251,474 Other receivables: (impairment reviewed) 164,117 143,534 Less than 60 days 46,399 87 60 ~ 90 days 31,183 4,881 90 ~ 120 days 1,873 1,248 120 days ~ 1 year 11,803 11,438 Over 1 year 72,859 125,880 2,528,084 2,395,008 Less: allowance for doubtful accounts (132,379 ) (82,710 ) Less: present value discount (4,860 ) (6,930 ) ￦ 2,390,845 2,305,368
Changes in the allowance for doubtful accounts	(6) Changes in the allowance for doubtful accounts for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 Trade Other Trade Other Trade Other In millions of won Beginning balance ￦ 215,868 104,726 212,759 114,155 208,990 132,379 Bad debt expense 29,221 19,206 24,021 27,329 19,039 18,411 Write-off (10,106 ) (1,146 ) (20,332 ) (1,910 ) (21,809 ) (58,762 ) Reversal (41,940 ) — (3,373 ) (2,464 ) (1,071 ) (79 ) Others 19,716 (8,631 ) (4,085 ) (4,731 ) 190 (9,239 ) Ending balance ￦ 212,759 114,155 208,990 132,379 205,339 82,710

Financial Assets at Fair Valu_3

Financial Assets at Fair Value through Profit or Loss (Tables)	12 Months Ended
	Dec. 31, 2021
Financial assets at fair value through profit or loss [abstract]
Financial Assets at Fair Value through Profit or Loss	(1) Financial assets at fair value through profit or loss as of December 31, 2020 and 2021 are as follows: 2020 2021 Current Non-current Current Non-current In millions of won Financial assets at fair value through profit or loss Beneficiary Certificate ￦ 1,313 155,122 629 206,160 Cooperative — 5,692 — 5,797 Other (*) 1,194,788 312,401 360,204 202,003 1,196,101 473,215 360,833 413,960 Financial assets designated as at fair value through profit or loss Debt with embedded derivatives — 212,066 — 258,071 ￦ 1,196,101 685,281 360,833 672,031 (*) ‘Other’ includes MMT, etc.
Gains (losses) on 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, 2020 and 2021 are as follows: 2020 2021 In millions of won Beneficiary Certificate ￦ 6,127 13,632 Cooperative 645 110 Debt with embedded derivatives 3,598 854 Other 30,329 19,848 ￦ 40,699 34,444

Financial Assets at Fair Valu_4

Financial Assets at Fair Value through Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2021
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, 2020 and 2021 are as follows: 2020 Beginning Acquisition Disposal Valuation Others Ending In millions of won Listed ￦ 201,201 — (4 ) (7,809 ) 1,281 194,669 Unlisted 177,969 2,900 (1 ) (23,128 ) 6,150 163,890 379,170 2,900 (5 ) (30,937 ) 7,431 358,559 Current financial assets at fair value through other comprehensive income ￦ — — — — — — Non-current financial assets at fair value through other comprehensive income 379,170 2,900 (5 ) (30,937 ) 7,431 358,559 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 financial assets at fair value through other comprehensive income 358,559 10,929 (8,221 ) 68,777 5,063 435,107
Financial Assets at Fair Value through Other Comprehensive Income	2020 Shares Ownership Acquisition cost Book value Fair value In millions of won Listed Korea District Heating Corp. 2,264,068 19.55 % ￦ 173,201 91,356 91,356 Ssangyong Motor Co., Ltd. 38,568 0.03 % 428 107 107 SM Korea Line Corp. 180 0.00 % 1 1 1 Namkwang Engineering & Construction Co., Ltd. 121 0.00 % 15 1 1 Bumyang Construction Co., Ltd. 35 0.00 % 2 — — Elcomtec 32,875 0.04 % 217 49 49 P an 1,492 0.00 % 14 7 7 Dongbu Corp. 955 0.02 % 12 13 13 KSP Co., Ltd. 22,539 0.08 % 53 34 34 STX Heavy Industries Co., Ltd. 7,419 0.12 % 107 29 29 Codes Combine Co., Ltd. 291 0.00 % 1 1 1 PT Adaro Energy Tbk. 480,000,000 1.50 % 65,028 53,127 53,127 Energy Fuels Inc. 1,711,814 1.31 % 16,819 7,888 7,888 Bunji Corporation Limited 99,763 0.07 % 18,445 — — Denison Mines Corp. 58,284,000 9.76 % 84,134 41,776 41,776 Fission 3.0 75,000 0.05 % — 6 6 Fission Uranium Corp. 800,000 0.16 % 785 266 266 SangSangin Industry Co., Ltd.(formerly, DMC Co., Ltd.) 5,831 0.02 % 38 4 4 Vitzosys Co., Ltd. 399 0.00 % 2 2 2 EMnI Co., Ltd. 1,257 0.00 % 25 2 2 359,327 194,669 194,669 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 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 % 15 15 15 KC Development Co., Ltd. 839 0.02 % 6 6 6 Imhwa 329 0.11 % 5 5 5 Dalim 58 0.08 % 10 10 10 ASA Jeonju 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 Co., Ltd. 2,512 0.25 % 126 21 21 Buyoung Co., Ltd. 270 0.00 % 3 3 3 Ilsuk Co., Ltd. 152 0.17 % 10 10 10 Dongyang Telecom Co., Ltd. 1,760 0.01 % 11 1 1 Jongwon Remicon Co., Ltd. 31 0.18 % 13 13 13 Zyle Daewoo Motor Sales Co., Ltd. 22 0.00 % — — — Daewoo Development Co., Ltd. 8 0.00 % — — — Seyang Inc. 537 0.05 % 27 27 27 2020 Shares Ownership Acquisition cost Book value Fair value In millions of won Seungri Enterprise Co., Ltd. 93 0.05 % 3 3 3 Shin-E P&C Co., Ltd. 1,569 0.64 % 111 3 3 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 Shinil Engineering Co., Ltd. 887 0.06 % 3 3 3 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 Kolmar Pharma Co., Ltd. 1,426 0.01 % 52 3 3 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 25 25 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 2020 Shares Ownership Acquisition cost Book value Fair value In millions of won AID C o 1,212 0.57 % 36 36 36 Changwon Eco-friendly farming Corp. 3 0.01 % — — — Kumo Hitech Co., Ltd. 6,697 0.53 % 100 100 100 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 Shinseung Chemical Industy Co., Ltd. 5 0.01 % 60 60 60 KJ Alloy Co., Ltd. 368 0.20 % 7 7 7 SM Hi-tech Co., Ltd. 22 0.39 % 22 22 22 Keum Mun Industry Co., Ltd. 1,320 0.97 % 330 56 56 Puruen Environment Co., Ltd. 967 1.34 % 19 19 19 Miretech Co., Ltd. 9,111 0.27 % 18 18 18 SIE Co., Ltd. 12 0.02 % 1 1 1 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 Tech Co., Ltd. 1,159 6.28 % 81 81 81 Wongwang Door Corp. 575 1.00 % 29 29 29 Seobu Highway Solar Co., Ltd. 19,460 2.86 % 195 195 195 Dongbu Highway Solar Co., Ltd. 19,020 4.99 % 190 190 190 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 % 2 2 2 Daechang HRSG Co.,Ltd. 618 0.12 % 62 62 62 Shinjin International Corp. 4 0.01 % 1 1 1 Daewoon Shell Tech Co., Ltd. 666 2.81 % 33 33 33 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 Daedong Millennium 159 0.42 % 32 32 32 Daeji Product Co., Ltd. 15 0.05 % 1 — — Cheong Hae Myeong Ga Co.,Ltd. 1,867 0.11 % 5 5 5 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 83 83 KMLC Co., Ltd. 281 0.14 % 22 22 22 2020 Shares Ownership Acquisition Book value Fair value In millions of won 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 K orea 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 Enaindustry Co., Ltd. 201 0.28 % 141 141 141 TCT Co., Ltd. 3,277 0.55 % 82 82 82 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 % — — — Sung Ae Co., Ltd. 190 0.80 % 10 10 10 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 HIC Co., Ltd. 7,408 0.71 % 111 111 111 Addies Direct Co., Ltd. 1 0.00 % — — — World 131 1.09 % 10 10 10 Superone Co., Ltd. 1,585 1.45 % 8 8 8 Deok-u Co., Ltd. 1,626 1.92 % 195 195 195 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 Dongjin Foundry Industry Co., Ltd. 966 4.10 % 193 193 193 Yooseung Co., Ltd. 10 0.08 % 1 1 1 Sungkwang Co., Ltd. 48 0.35 % 2 2 2 Taeyang Gasteel 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 2020 Shares Ownership Acquisition cost Book value Fair value In millions of won TK Co., Ltd. 307 0.70 % 15 15 15 Sungdo Co., Ltd. 130 1.10 % 52 52 52 KSM Tecj Co., Ltd. 25 0.11 % 1 1 1 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 Sungshin Parts Co., Ltd. 345 0.40 % 14 14 14 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 Co., Ltd. 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 Koomin Precisions Co., Ltd. 124 0.26 % 12 12 12 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 Tpp Co., Ltd. 36,645 11.72 % 1,832 1,832 1,832 Kuklim Plastic New Technology Co., Ltd. 393 0.29 % 8 8 8 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 Co., Ltd. 38 0.02 % 1 1 1 Newclean Livestock Co., Ltd. 86 0.17 % 4 4 4 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 Panax Korea Co., Ltd. 58 0.14 % 9 9 9 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 Para Belleza Co., Ltd 1,211 1.74 % 74 74 74 Dongsung Co., Ltd. 1,983 1.63 % 198 198 198 Ssangyong Youngweol Plant Service&Engineering Co., Ltd. 83 0.07 % 4 4 4 SH Co., Ltd. 31 0.20 % 6 6 6 2020 Shares Ownership Acquisition Book value Fair value In millions of won Namsunnam Co., Ltd. 1,275 0.19 % 6 6 6 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 37 37 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 82 82 SGC Energy Co., Ltd. 580,000 5.00 % 2,900 2,900 2,900 Ihsung CNI Co., Ltd. 13,526 18.22 % 3,000 3,000 3,000 H Robotics Co., Ltd. 9,192 4.55 % 1,000 1,000 1,000 Good Tcells Co., Ltd. 11,364 0.34 % 500 500 500 275,496 163,890 163,890 ￦ 634,823 358,559 358,559 (*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, 2020. 2021 Shares Ownership Acquisition 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 32,875 0.04 % 217 42 42 P an 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 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 329 0.11 % 5 5 5 Dalim 58 0.08 % 10 10 10 ASA Jeonju 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 Co., Ltd. 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 Seungri Enterprise Co., Ltd. 93 0.05 % 3 3 3 Shin-E P&C Co., Ltd. 1,569 0.64 % 111 2 2 Ejung Ad Co., Ltd. 132 0.09 % 3 3 3 2021 Shares Ownership Acquisition Book value Fair value In millions of won 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 Sung Kwang Co., Ltd. 23 0.37 % 6 6 6 Shinheung P 699 0.14 % 35 35 35 2021 Shares Ownership Acquisition Book value Fair value In millions of won 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 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 C 143 0.22 % 36 36 36 AID C o 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 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 Shinseung Chemical Industy Co., Ltd. 5 0.01 % 60 60 60 KJ Alloy Co., Ltd. 368 0.20 % 7 7 7 SM Hi-tech Co., Ltd. 22 0.39 % 22 22 22 2021 Shares Ownership Acquisition Book value Fair value In millions of won 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 Tech Co., Ltd. 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 Daedong Millennium 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 K orea 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., . 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 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 2021 Shares Ownership Acquisition Book value Fair value In millions of won 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 G 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 Co., Ltd. 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 % — — — 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 2021 Shares Ownership Acquisition Book value Fair value In millions of won Geumdani Co., Ltd. 2,377 1.82 % 36 36 36 Mezzanine I-pack Co., Ltd. 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 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 2021 Shares Ownership Acquisition cost Book value Fair value In millions of won 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 E&C Co., Ltd. 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 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 2021 Shares Ownership Acquisition cost Book value Fair value In millions of won 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 Metal Co., Ltd. 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. — 0.00 % 38 38 38 Information&Communication Financial Cooperative Co., Ltd. — 0.00 % 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. 2020 Shares Ownership Acquisition cost Book value Fair value In millions of won Dong Yang Metal Co., Ltd. 2,951 1.97 % 161 147 147 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 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 Tae Hyung Co., Ltd. 28 0.43 % 20 20 20 Younil Metal Co., Ltd. 41 0.21 % 21 21 21 Hankook Precision Ind Co., Ltd. 110 0.06 % 3 3 3 CJ Paradise Co.,Ltd 24 0.02 % 12 12 12 Han Young Technology Company Co.,Ltd. 35 0.00 % — — — 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 6 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 2,379 0.60 % 12 12 12 Shin kwang Industrial Co., Ltd. 884 0.35 % 55 55 55 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 PT. Kedap Saayq 671 10.00 % 18,540 — — Set Holding (*2) 1,100,220 2.50 % 229,255 143,765 143,765 PT. Cirebon Energi Prasarana 22,420 10.00 % 2,612 2,440 2,440 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 % 159 159 159 Sungsan Parts Co., Ltd. 629 0.80 % 63 63 63 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 Yeong-gwang Remicon Co., Ltd.

Financial Assets at Amortized_2

Financial Assets at Amortized Cost (Tables)	12 Months Ended
	Dec. 31, 2021
Financial Assets at Amortized Cost [Abstract]
Financial Assets at Amortized Cost	Financial assets at amortized cost as of December 31, 2020 and 2021 are as follows: 2020 Financial assets at amortized cost Government grants Allowance for doubtful accounts Others Book value In millions of won Government bonds ￦ 1,422 — — — 1,422 Others 13,000 — — — 13,000 ￦ 14,422 — — — 14,422 Current ￦ 13,149 — — — 13,149 Non-current 1,273 — — — 1,273 2021 Financial assets at amortized cost Government grants Allowance for doubtful accounts Others 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

Derivatives (Tables)

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2021
Derivatives [Abstract]
Derivatives	(1) Derivatives as of December 31, 2020 and 2021 are as follows: 2020 2021 Current Non-current Current Non-current In millions of won Derivative assets Currency forward ￦ 18,332 — 559 6,899 Currency swap 11,193 127,386 125,877 506,957 —Trading — 82,931 92,313 335,765 —Hedging 11,193 44,455 33,564 171,192 Interest rate swap — 9,502 502 6,980 —Trading — 9,502 502 6,980 —Hedging — — — — Others — — — 9 ￦ 29,525 136,888 126,938 520,845 Derivative liabilities Currency forward ￦ 10,014 4,977 301 — Currency swap 36,088 232,669 4,446 16,708 —Trading — 93,245 4,446 15,576 —Hedging 36,088 139,424 — 1,132 Interest rate swap 3,782 66,451 2,544 28,138 —Trading 2,192 22,687 174 2,829 —Hedging 1,590 43,764 2,370 25,309 Others (*1,2,3) — 11,138 — 25,894 ￦ 49,884 315,235 7,291 70,740 (*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’. (*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, 2021 are as follows: Contract Maturity date Contract amounts Contract exchange rate (in won) Counterparty Pay Receive In millions of won and thousands of USD except contract exchange rate information Korea Development Bank 2021.09.27 2022.01.07 ￦ 59,049 USD 50,050 ￦ 1,179.80 Shinhan Bank 2021.12.13 2022.01.04 17,354 USD 14,720 1,178.95 Hana Bank 2021.12.24 2022.01.11 1,185 USD 1,000 1,185.35 Hana Bank 2021.12.30 2022.01.06 11,840 USD 10,004 1,183.53 Kookmin Bank 2021.12.23 2022.01.14 11,869 USD 10,000 1,186.92 Mizuho Bank 2021.12.27 2022.01.17 11,862 USD 10,000 1,186.20 Morgan Stanley 2021.12.24 2022.01.13 11,865 USD 10,000 1,186.50 Nonghyup Bank 2021.12.10 2022.01.03 11,746 USD 10,000 1,174.60 Nonghyup Bank 2021.12.30 2022.01.18 11,880 USD 10,000 1,188.00 Nonghyup Bank 2021.12.23 2022.01.12 5,921 USD 5,000 1,184.10 Standard Chartered 2021.12.24 2022.01.13 11,796 USD 10,000 1,179.62 Woori Bank 2021.12.16 2022.01.13 8,985 USD 7,590 1,183.90 Woori Bank 2021.12.29 2022.01.20 11,870 USD 10,000 1,187.00 JP Morgan 2021.12.23 2022.01.04 14,243 USD 12,000 1,186.88 JP Morgan 2021.12.23 2022.01.04 6,532 USD 5,500 1,187.68 HSBC 2021.12.30 2022.01.07 16,601 USD 14,000 1,185.77 JP Morgan 2021.12.30 2022.01.07 16,601 USD 14,000 1,185.82 Nonghyup Bank 2021.12.23 2022.01.10 11,871 USD 10,000 1,187.10 Standard Chartered 2021.12.23 2022.01.12 10,690 USD 9,000 1,187.80 Mizuho Bank 2021.12.29 2022.01.03 5,932 USD 5,000 1,186.40 JP Morgan 2021.12.29 2022.01.03 4,744 USD 4,000 1,186.00 HSBC 2021.12.29 2022.01.20 5,936 USD 5,000 1,187.14 HSBC 2021.12.30 2022.01.21 17,771 USD 15,000 1,184.70 MUFG 2021.12.30 2022.01.25 5,925 USD 5,000 1,184.90 HSBC 2020.10.19 2024.10.29 140,913 USD 125,000 1,127.30 HSBC 2021.11.30 2022.01.07 5,939 USD 5,000 1,187.70 HSBC 2021.11.30 2022.01.07 5,934 USD 5,000 1,186.70 HSBC 2021.11.30 2022.01.07 5,929 USD 5,000 1,185.70 Woori Bank 2021.12.01 2022.01.07 11,856 USD 10,000 1,185.55 Woori Bank 2021.12.29 2022.01.28 11,885 USD 10,000 1,188.50 MUFG 2021.12.29 2022.01.28 11,876 USD 10,000 1,187.55 Woori Bank 2021.12.30 2022.01.28 11,852 USD 10,000 1,185.20 Woori Bank 2021.12.23 2022.02.18 8,316 USD 7,000 1,188.00 HSBC 2021.12.29 2022.02.18 11,880 USD 10,000 1,188.00 Shinhan Bank 2021.12.24 2022.02.25 5,938 USD 5,000 1,187.50 Hana Bank 2021.12.24 2022.02.25 5,935 USD 5,000 1,186.99 Standard Chartered 2021.12.29 2022.02.25 11,885 USD 10,000 1,188.50 MUFG 2021.12.17 2022.03.18 259 USD 219 1,183.74
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, 2021 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 Citibank 2012~2022 112,930 USD 100,000 2.79% 3.00% 1,129.30 JP Morgan 2012~2022 112,930 USD 100,000 2.79% 3.00% 1,129.30 Bank of America 2012~2022 112,930 USD 100,000 2.79% 3.00% 1,129.30 Shinhan Bank 2016~2022 112,930 USD 100,000 2.79% 3.00% 1,129.30 HSBC 2012~2022 111,770 USD 100,000 2.89% 3.00% 1,117.70 Hana Bank 2012~2022 111,770 USD 100,000 2.87% 3.00% 1,117.70 Standard Chartered 2012~2022 111,770 USD 100,000 2.89% 3.00% 1,117.70 Deutsche Bank 2012~2022 55,885 USD 50,000 2.79% 3.00% 1,117.70 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 Citibank 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 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, 2021 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 Korea Development Bank 2019~2022 112,650 USD 100,000 1.80% 3.38% 1,126.50 Kookmin Bank 2019~2022 112,650 USD 100,000 1.80% 3.38% 1,126.50 Woori Bank 2019~2022 112,650 USD 100,000 1.80% 3.38% 1,126.50 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 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 2019~2022 117,340 USD 100,000 1.06% 2.38% 1,173.40 Hana Bank 2019~2022 117,340 USD 100,000 1.06% 2.38% 1,173.40 Kookmin Bank 2019~2022 117,340 USD 100,000 1.06% 2.38% 1,173.40 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 Hana Bank 2017~2022 226,600 USD 200,000 1.94% 2.63% 1,133.00 Korea Development Bank 2017~2022 113,300 USD 100,000 1.94% 2.63% 1,133.00 Nomura 2017~2022 113,300 USD 100,000 1.95% 2.63% 1,133.00 Woori Bank 2017~2022 56,650 USD 50,000 1.95% 2.63% 1,133.00 Kookmin Bank 2017~2022 56,650 USD 50,000 1.95% 2.63% 1,133.00 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
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, 2021 are as follows: Counterparty Contract Contract amount Contract interest rate per annum Pay Receive In millions of won Hana Bank 2017~2022 ￦ 100,000 2.01% 3M CD + 0.24% Hana Bank 2017~2022 100,000 2.06% 3M CD + 0.27% 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% Societe Generale 2017~2022 200,000 3M Libor + 3.44% 3.77% 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% (*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, 2021 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 60,316 4.16% 6M USD Libor KFW 2009~2027 USD 60,316 4.16% 6M USD Libor Export-Import Bank of Korea 2016~2036 USD 71,116 3.00% 6M USD Libor
Disclosure 0f gain loss on valuation And transaction derivatives	(7) Gain and loss on valuation and transaction of derivatives for the years ended December 31, 2019, 2020 and 2021 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 2019 2020 2021 2019 2020 2021 2019 2020 2021 In millions of won Currency forward ￦ 24,265 (40,590 ) 33,066 12,488 (17,911 ) 33,032 — — — Currency swap 310,732 (406,607 ) 787,264 110,813 93,557 61,353 38,802 105,642 (59,108 ) - Trading 172,087 (108,090 ) 420,551 52,842 16,661 16,265 — — — - Hedging 138,645 (298,517 ) 366,713 57,971 76,896 45,088 38,802 105,642 (59,108 ) Interest rate swap (16,231 ) (1,845 ) 18,123 (36,886 ) (10,253 ) (10,303 ) (3,075 ) 5,578 18,648 - Trading (15,647 ) (309 ) 18,123 (2,495 ) (11,975 ) (10,303 ) — — — - Hedging (584 ) (1,536 ) — (34,391 ) 1,722 — (3,075 ) 5,578 18,648 Other derivatives (1,416 ) (6,673 ) (15,459 ) — — — — — — ￦ 317,350 (455,715) 822,994 86,415 65,393 84,082 35,727 111,220 (40,460) (*) For the year ended December 31, 2021, the net loss on valuation of derivatives applying cash flow hedge accounting of ￦15,778 million, net of tax, is included in other comprehensive income (loss).

Other Financial Assets (Tables)

Other Financial Assets (Tables)	12 Months Ended
	Dec. 31, 2021
Other Financial Assets [Abstract]
Other Financial Assets	(1) Other financial assets as of December 31, 2020 and 2021 are as follows: 2020 2021 Current Non-current Current Non-current In millions of won Loans ￦ 78,806 762,555 88,406 903,397 Less: Allowance for doubtful accounts (1 ) (20,266 ) (10 ) (52,667 ) Less: Present value discount (842 ) (30,090 ) (807 ) (29,248 ) 77,963 712,199 87,589 821,482 Long-term / short-term financial instruments 1,483,482 578,621 1,278,014 450,494 ￦ 1,561,445 1,290,820 1,365,603 1,271,976
Loans and receivables	(2) Loans as of December 31, 2020 and 2021 are as follows: 2020 Face value Allowance for Present value Carrying value In millions of won Short-term loans Loans for tuition ￦ 33,864 — (842 ) 33,022 Loans for housing 21,988 — — 21,988 Fisheries loan 3,816 — — 3,816 Other loans 19,138 (1 ) — 19,137 78,806 (1 ) (842 ) 77,963 Long-term loans Loans for tuition 420,274 (9,091 ) (30,090 ) 381,093 Loans for housing 237,100 — — 237,100 Loans for related parties 50,682 (1,047 ) — 49,635 Other loans 54,499 (10,128 ) — 44,371 762,555 (20,266 ) (30,090 ) 712,199 ￦ 841,361 (20,267 ) (30,932 ) 790,162 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
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, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Beginning balance ￦ 4,952 15,094 20,267 Bad debt expense 10,142 5,173 30,942 Other — — 1,468 Ending balance ￦ 15,094 20,267 52,677
Long-term and short-term financial instruments	(4) Long-term and short-term financial instruments as of December 31, 2020 and 2021 are as follows: 2020 2021 Current Non-current Current Non-current In millions of won Time deposits ￦ 996,265 160,433 976,899 103,607 CD 50,000 — — — RP 203,008 — — — Others 234,209 418,188 301,115 346,887 ￦ 1,483,482 578,621 1,278,014 450,494

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2021
Classes of current inventories [abstract]
Inventories	Inventories as of December 31, 2020 and 2021 are as follows: 2020 Acquisition cost Valuation allowance Book value In millions of won Raw materials ￦ 3,602,073 (885 ) 3,601,188 Merchandises 234 — 234 Work-in-progress 148,067 — 148,067 Finished goods 42,070 — 42,070 Supplies 2,280,682 (7,892 ) 2,272,790 Inventories-in-transit 666,967 — 666,967 Other inventories 11,593 — 11,593 ￦ 6,751,686 (8,777 ) 6,742,909 2021 Acquisition cost Valuation allowance Book value 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 The reversals of the allowance for loss on inventory valuation due to increase in the net realizable value of inventories deducted from cost of sales for the years ended December 31, 2019, 2020 and 2021 were ￦4,872 million, ￦2,020 million and ￦11,422 million, respectively. The amounts of loss from inventory valuation included in other gains or losses for the years ended December 31, 2019, 2020 and 2021 were ￦3,127 million, ￦4,998 million and ￦7,761 million, respectively.

Non-Financial Assets (Tables)

Non-Financial Assets (Tables)	12 Months Ended
	Dec. 31, 2021
Disclosure Of Other Assets [Abstract]
Non-Financial Assets	Non-financial assets as of December 31, 2020 and 2021 are as follows: 2020 2021 Current Non-current Current Non-current In millions of won Advanced payments ￦ 169,737 32,693 161,466 124,305 Prepaid expenses 216,073 140,730 756,729 151,095 Others (*1) 634,348 72,969 840,796 89,418 ￦ 1,020,158 246,392 1,758,991 364,818 (*1)  Details of others as of December 31, 2020 and 2021 are as follows: 2020 2021 Current Non-current Current Non-current In millions of won Greenhouse gas emissions rights ￦ 357,355 — 524,658 — Other quick assets 276,993 72,969 316,138 89,418 ￦ 634,348 72,969 840,796 89,418

Consolidated Subsidiaries (Tabl

Consolidated Subsidiaries (Tables)	12 Months Ended
	Dec. 31, 2021
Disclosure of subsidiaries [abstract]
Summary of Consolidated Subsidiaries	(1) Consolidated subsidiaries as of December 31, 2020 and 2021 are as follows: Percentage of ownership (%) Subsidiaries Key operation activities Location 2020 2021 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. 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 % Korea Imouraren Uranium Investment Corp. Holding company France 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 % DG Fairhaven Power, LLC Power generation USA 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 % 100.00 % KOSEP USA, Inc. Power generation 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 % Percentage of ownership (%) Subsidiaries Key operation activities Location 2020 2021 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 % 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 % VI Carbon Professional Private Special Asset Investment Trust 1 Holding company Korea 96.67 % — Chitose Solar Power Plant LLC Power generation Japan 80.10 % 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 % 50.10 % KEPCO Solar of Alamosa LLC Power generation USA 100.00 % 100.00 % KEPCO Mangilao Holdings LLC(*6) Holding company USA 100.00 % 100.00 % Mangilao Investment LLC Holding company USA 100.00 % 100.00 % KEPCO Mangilao Solar, LLC Power generation USA 100.00 % 100.00 % Jeju Hanlim Offshore Wind Co., Ltd. Power generation Korea 75.99 % 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(*7) Holding company USA 100.00 % 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 % Percentage of ownership (%) Subsidiaries Key operation activities Location 2020 2021 Paju Ecoenergy Co., Ltd. Power generation Korea 89.00 % 89.00 % Guam Ukudu Power LLC Power generation USA 100.00 % 100.00 % 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 % 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 % Yeong Yang Apollon Photovoltaic Co., Ltd. Power generation Korea — 100.00 % Yeong Yang Corporation Co., Ltd. Power generation Korea — 100.00 % SolarVader Co., Ltd. Power generation Korea — 100.00 % Yeong Yang Innovation Co., Ltd. Power generation Korea — 100.00 % Yeong Yang Horus Photovoltaic Co., Ltd. Power generation Korea — 100.00 % Yeong Yang Solar Management Co., Ltd. Power generation Korea — 100.00 % LSG Hydro Power Limited Holding company Pakistan — 99.80 % KOEN Bio Co., Ltd. Wood pellet utilization business Korea — 70.00 % KOMIPO Energy Solution America, LLC Holding company USA — 100.00 % Elara Investment Holdings, LLC(*8) Holding company USA — 0.10 % Elara Equity Holdings, LLC Holding company USA — 51.22 % Elara Class B Holdings, LLC Holding company USA — 100.00 % Elara Class B Member, LLC Holding company USA — 100.00 % Elara Development Holdings, LLC Holding company USA — 100.00 % Elara Development, LLC Holding company USA — 100.00 % Elara Energy Holdings, LLC(*8) Holding company USA — 43.94 % Elara Energy Project, LLC Power generation USA — 100.00 % KOMIPO Iberian Solar Group, S.L.U. Holding company Spain — 100.00 % Jeongam Wind Power Co., Ltd. Power generation Korea — 80.00 % KOWEPO Europe B.V. Holding company Netherlands — 100.00 % CVS Equity Holdings, LLC Holding company USA — 100.00 % CVS Class B Holdings, LLC Holding company USA — 100.00 % CVS Development Holdings, LLC Holding company USA — 100.00 % CVS Development, LLC Holding company USA — 100.00 % CVS Class B Member, LLC Holding company USA — 100.00 % CVS Energy Holdings, LLC Holding company USA — 100.00 % Concho Valley Energy, LLC Holding company USA — 100.00 % Concho Valley Solar, LLC Power generation USA — 100.00 % Yeongdeok Sunrise Wind Power Co., Ltd. Power generation Korea — 70.00 % KHNP Spain, S.L. Holding company Spain — 100.00 % (*1) Considering treasury stocks, the effective percentage of ownership is 66.08%. (*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. (*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 84 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) As of the end of the reporting period, the Company does not have a shareholding; however, this subsidiary is included in the consolidated financial statements as the Company has control over the entity by virtue of the right to nominate all 4 members of the board of directors. (*7) As of the end of the reporting period, the Company does not have a shareholding; however, this subsidiary is included in the consolidated financial statements as the Company has control over the entity by virtue of the right to nominate the CEO and key management members. (*8) The effective percentage of ownership is less than 50%. However, this consolidated subsidiary is included in the consolidated financial statements as the Company has control over the board of directors under the shareholders’ agreement.
Summary of Subsidiaries Newly Included in or Excluded from Consolidation	Subsidiaries included in consolidation during the year ended December 31, 2021. Subsidiaries Reason KHNP Chile SpA Newly established Yeong Yang Apollon Photovoltaic Co., Ltd. New investment Yeong Yang Corporation Co., Ltd. New investment SolarVader Co., Ltd. New investment Yeong Yang Innovation Co., Ltd. New investment Yeong Yang Horus Photovoltaic Co., Ltd. New investment Yeong Yang Solar Management Co., Ltd. New investment LSG Hydro Power Limited Newly established KOEN Bio Co., Ltd. Newly established KOMIPO Energy Solution America, LLC Newly established Elara Investment Holdings, LLC Newly established Elara Equity Holdings, LLC Newly established Elara Class B Holdings, LLC Newly established Elara Class B Member, LLC Newly established Elara Development Holdings, LLC Newly established Elara Development, LLC Newly established Elara Energy Holdings, LLC Newly established Elara Energy Project, LLC New investment KOMIPO Iberian Solar Group, S.L.U. New investment Prime Swedish Holding AB Newly established Jeongam Wind Power Co., Ltd. Change in a relationship KOWEPO Europe B.V. Newly established CVS Equity Holdings, LLC Newly established CVS Class B Holdings, LLC Newly established CVS Development Holdings, LLC Newly established CVS Development, LLC Newly established CVS Class B Member, LLC Newly established CVS Energy Holdings, LLC Newly established Concho Valley Energy, LLC Newly established Concho Valley Solar, LLC New investment Yeongdeok Sunrise Wind Power Co., Ltd. Newly established KHNP Spain, S.L. Newly established Subsidiaries excluded from consolidation during the year ended December 31, 2021. Subsidiaries Reason DG Fairhaven Power, LLC Disposal VI Carbon Professional Private Special Asset Investment Trust 1 Liquidation Prime Swedish Holding AB Change in a relationship KOSEP USA, Inc. Liquidation Korea Liquidation
Summary of Financial Information of Consolidated Subsidiaries	(3) Summary of financial information of consolidated subsidiaries as of and for the years ended December 31, 2020 and 2021 are as follows: 2020 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won Korea Hydro & Nuclear Power Co., Ltd. ￦ 61,859,753 35,652,467 9,938,941 647,641 Korea South-East Power Co., Ltd. 10,858,645 5,954,129 4,258,904 (139,149 ) Korea Midland Power Co., Ltd. 13,028,436 9,357,603 4,293,364 (29,880 ) Korea Western Power Co., Ltd. 10,357,023 6,594,779 3,605,986 (108,953 ) Korea Southern Power Co., Ltd. 10,658,015 6,411,524 4,015,941 (17,588 ) Korea East-West Power Co., Ltd. 9,619,485 4,974,645 4,155,416 (65,427 ) KEPCO Engineering & Construction Company, Inc. 699,244 200,169 431,723 20,160 KEPCO Plant Service & Engineering Co., Ltd. 1,345,857 296,515 1,299,186 85,916 KEPCO Nuclear Fuel Co., Ltd. 798,368 390,155 331,228 14,542 KEPCO KDN Co., Ltd. 647,496 174,192 641,308 45,207 KEPCO International HongKong Ltd. 120,213 — — 1,571 KEPCO International Philippines Inc. 133,215 366 — 35,182 KEPCO Gansu International Ltd. 7,753 512 — (19 ) KEPCO Philippines Holdings Inc. 187,375 127 — 65,792 KEPCO Philippines Corporation 6,173 17 — (187 ) KEPCO Ilijan Corporation 322,066 47,234 81,400 39,443 KEPCO Lebanon SARL 1,669 9,195 — (59 ) KEPCO Neimenggu International Ltd. 213,444 2,492 — 26,593 KEPCO Shanxi International Ltd. 508,363 196,408 — 2,278 KOMIPO Global Pte Ltd. 263,378 656 — 12,460 KEPCO Netherlands B.V. 117,449 71 — 14,503 Korea Imouraren Uranium Investment Corp. 13,955 123 — (675 ) KEPCO Australia Pty., Ltd. 451 17 — 71 KOSEP Australia Pty., Ltd. 34,249 3,500 14,327 2,150 KOMIPO Australia Pty., Ltd. 45,250 3,782 14,327 2,685 KOWEPO Australia Pty., Ltd. 44,270 2,909 14,327 1,663 KOSPO Australia Pty., Ltd. 38,341 2,750 14,327 2,242 KEPCO Middle East Holding Company 90,601 78,553 — (1,539 ) Qatrana Electric Power Company 464,507 287,859 21,279 24,717 KHNP Canada Energy Ltd. 63,794 26 — (7 ) KEPCO Bylong Australia Pty., Ltd. 44,691 349,542 — 16,897 Korea Waterbury Uranium Limited Partnership 20,908 165 — (76 ) KEPCO Holdings de Mexico 148 27 — (14 ) KST Electric Power Company, S.A.P.I. de C.V. 531,367 410,743 65,695 37,899 KEPCO Energy Service Company 2,255 994 5,880 507 KEPCO Netherlands S3 B.V. 44,042 54 — 2,833 PT. KOMIPO Pembangkitan Jawa Bali 12,946 3,298 20,306 4,775 PT. Cirebon Power Service 1,825 550 8,642 344 KOWEPO International Corporation — 10 — — KOSPO Jordan LLC 31,620 15,654 9,356 1,570 EWP America Inc.(*1) 37,681 2,683 14,312 (14,327 ) KNF Canada Energy Limited 1,871 22 — (50 ) EWP Barbados 1 SRL 313,409 1,170 2,950 44,729 Gyeonggi Green Energy Co., Ltd. 265,768 240,366 64,660 (9,968 ) PT. Tanggamus Electric Power 217,730 184,057 3,491 11,942 Gyeongju Wind Power Co., Ltd. 105,726 68,629 13,939 2,108 KOMIPO America Inc. 105,926 918 342 (1,783 ) KOSEP USA, Inc. 1 4,837 — — PT. EWP Indonesia 33,900 1,125 — 7,083 KEPCO Netherlands J3 B.V. 138,824 84 — 28,242 Korea Offshore Wind Power Co., Ltd. 354,643 187,576 26,838 98 Global One Pioneer B.V. 177 60 — (76 ) Global Energy Pioneer B.V. 338 64 — (70 ) Mira Power Limited 348,737 266,565 31,172 (2,960 ) KOSEP Material Co., Ltd. 2,312 429 3,457 189 2020 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won Commerce and Industry Energy Co., Ltd. ￦ 89,681 41,384 31,603 1,623 KEPCO KPS Philippines Corp. 3,119 284 5,151 158 KOSPO Chile SpA 128,795 48,813 — (542 ) PT. KOWEPO Sumsel Operation And Maintenance Services 108 241 — (15 ) Hee mang sunlight Power Co., Ltd. 7,261 4,339 423 (142 ) Fujeij Wind Power Company 194,844 174,051 — 13,720 KOSPO Youngnam Power Co., Ltd. 389,071 294,408 254,966 3,405 VI Carbon Professional Private Special Asset Investment Trust 1 3,006 4 — 7 Chitose Solar Power Plant LLC 133,643 118,783 17,073 1,521 KEPCO Energy Solution Co., Ltd. 313,754 4,093 5,585 3,656 KEPCO Solar Co., Ltd. 230,443 23,098 3,933 1,888 KOSPO Power Services Ltda. 4,354 1,644 10,846 1,011 Energy New Industry Specialized Investment Private Investment Trust(*2) 279,489 24,173 23,682 8,248 KOEN Bylong Pty., Ltd. 6 75 — (11 ) KOMIPO Bylong Pty., Ltd. 7 76 — (11 ) KOWEPO Bylong Pty., Ltd. 6 64 — — KOSPO Bylong Pty., Ltd. 153 213 — (2 ) EWP Bylong Pty., Ltd. 6 35 — 28 KOWEPO Lao International 8,982 392 8,466 4,706 KEPCO US Inc. 16,154 — — (21 ) KEPCO Alamosa LLC 31,353 270 127 (237 ) KEPCO Solar of Alamosa LLC 68,336 42,910 9,096 (2,052 ) KEPCO Mangilao Holdings LLC 25,785 28,924 — (502 ) Mangilao Investment LLC 38,090 14 — (15 ) KEPCO Mangilao Solar, LLC 69,830 34,029 — (253 ) Jeju Hanlim Offshore Wind Co., Ltd. 20,525 9,805 — (3,049 ) PT. Siborpa Eco Power 10,491 14 — (361 ) PT. Korea Energy Indonesia 1,746 196 2,428 190 KOLAT SpA 31,109 425 243 (216 ) KEPCO California, LLC 41,973 4,683 — (1,330 ) KEPCO Mojave Holdings, LLC 95,326 67,138 — (4,358 ) Incheon Fuel Cell Co., Ltd. 192,184 170,976 — (979 ) KOEN Service Co., Ltd. 6,239 5,598 32,150 129 KOMIPO Service Co., Ltd. 3,381 3,649 28,596 (479 ) KOWEPO Service Co., Ltd. 6,045 4,849 29,559 726 KOSPO Service Co., Ltd. 5,617 4,708 25,103 832 EWP Service Co., Ltd. 4,568 4,074 23,223 (15 ) PT. KOMIPO Energy Indonesia 2,473 154 2,391 52 KNF Partners Co., Ltd. 1,470 743 5,487 256 KOSPO USA Inc. 120,380 266 — (1,611 ) Nambu USA LLC 42,739 — — 544 Tamra Offshore Wind Power Co., Ltd. 150,957 112,184 22,200 4,575 KEPCO MCS Co., Ltd. 59,227 36,786 342,053 19,190 KEPCO FMS Co., Ltd. 14,390 12,585 89,228 837 Firstkeepers Co., Ltd. 13,981 12,234 68,538 2,994 Secutec Co., Ltd. 11,473 9,771 62,256 1,609 SE Green Energy Co., Ltd. 152,205 122,606 19,731 2,463 KEPCO Mangilao America LLC 1,793 — — — Mangilao Intermediate Holdings LLC 100,609 80,210 — (3,708 ) KEPCO CSC Co., Ltd. 8,817 5,551 38,465 2,479 KOAK Power Limited 15,864 1,118 — 607 2020 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won KOMIPO Europe B.V. ￦ 43,198 46 333 (386 ) Haenanum Energy Fund 28,219 132 128 (13 ) Paju Ecoenergy Co., Ltd. 57,320 3,506 3,069 247 Guam Ukudu Power LLC 3,165 3,589 — (1,577 ) TS Energy No. 25 Co., Ltd. 184,667 142,709 — (3,779 ) KPS Partners Co., Ltd. 2,139 1,127 3,562 313 KEPCO E&C Service Co., Ltd. 2,514 1,549 4,989 464 Moha solar Co., Ltd. 7,390 7,809 — (364 ) Ogiri Solar Power Co., Ltd. 1,032 — — — KHNP USA LLC 464 23 229 119 KOMIPO Vanphong Power Service LLC 1,727 12 — (34 ) Energy Innovation Fund I 8,412 1 25 (201 ) (*1) Financial information of EWP America Inc. includes that of four other subsidiaries, EWP Renewable Corporation, DG Fairhaven Power, LLC, California Power Holdings, LLC and EWPRC Biomass Holdings, LLC. (*2) 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 2021 Subsidiaries Total assets 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. 13,756,040 9,912,907 5,263,302 54,869 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 Korea Imouraren Uranium Investment Corp. 83 — — (13,898 ) 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 ) 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 ) 2021 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won 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. 259,111 236,901 46,034 962 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 ) KOMIPO Europe B.V. 70,431 97 402 (503 ) 2021 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won 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 ) 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
Summary of Significant Restrictions on Abilities to Subsidiaries	(4) Significant restrictions on abilities to subsidiaries are as follows: Company Nature and extent of 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. The Company’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. The Company’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 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. 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.
Summary of Entitlements in Relation to Subsidiaries as per Shareholder Agreements	(5) As of December 31, 2021, the Company has following entitlements in relation to its subsidiaries as per its shareholder’s agreements: Company Nature and extent of significant restrictions KOSPO Youngnam Power Co., Ltd. The Company holds the right to purchase all shares held by the financial investors of KOSPO Youngnam Power Co., Ltd., a subsidiary of the Company, at face value of the issued shares on the 7th and 12th years from the Company’s establishment date. 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.
Summary of Non-Controlling Interest Prior to Intra-Group Eliminations	(6) Details of non-controlling 2019 Description KEPCO Ilijan KEPCO Plant KEPCO Construction Others Total In millions of won Percentage of ownership 49.00 % 49.00 % 33.92 % Current assets ￦ 173,931 779,764 257,593 864,596 2,075,884 Non-current 197,446 577,219 477,614 3,169,317 4,421,596 Current liabilities (11,990 ) (247,737 ) (223,522 ) (450,311 ) (933,560 ) Non-current (44,166 ) (47,020 ) (19,472 ) (2,193,501 ) (2,304,159 ) Net assets 315,221 1,062,226 492,213 1,390,101 3,259,761 Book value of non-controlling 154,458 520,491 166,959 551,423 1,393,331 Sales 95,072 1,244,613 448,635 855,023 2,643,343 Profit (loss) for the period 40,818 157,737 26,398 (48,963 ) 175,990 Profit (loss) for the period attributable to non-controlling 20,001 77,291 8,954 (24,264 ) 81,982 Cash flows from operating activities 101,707 164,373 27,081 219,450 512,611 Cash flows from investing activities 4,458 (89,159 ) 47,219 (356,434 ) (393,916 ) Cash flows from financing activities before dividends to non-controlling (68,678 ) (44,332 ) (34,632 ) 223,233 75,591 Dividends to non-controlling (48,750 ) (39,466 ) (1,807 ) (9,233 ) (99,256 ) Effect of exchange rate fluctuation 2,111 (593 ) (14 ) 2,501 4,005 Net increase (decrease) of cash and cash equivalents (9,152 ) (9,177 ) 37,847 79,517 99,035 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 134,668 514,177 169,286 552,035 1,370,166 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 32,858 101,122 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 3,829,243 4,931,883 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 1,593,574 3,436,637 Book value of non-controlling 108,052 543,458 174,163 717,166 1,542,839 Sales 60,532 1,375,668 433,127 1,277,848 3,147,175 Profit for the year 12,981 98,132 16,452 120,488 248,053 Profit for the year attributable to non-controlling 6,361 48,085 5,581 25,803 85,830 Cash flows from operating activities 116,440 133,160 (16,270 ) 295,532 528,862 Cash flows from investing activities 2,216 (39,444 ) 19,061 (301,402 ) (319,569 ) 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
Summary of Changes in Goodwill	(i) Details of goodwill as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Acquisition cost ￦ 98,166 105,647 Less: Accumulated impairment — — Carrying book value ￦ 98,166 105,647 (ii) Changes in goodwill for the years ended December 31, 2020 and 2021 are as follows: 2020 Beginning Increase Decrease Ending In millions of won Acquisition cost ￦ 97,977 189 — 98,166 Less: Accumulated impairment — — — — Carrying book value ￦ 97,977 189 — 98,166 2021 Beginning Increase Decrease Ending In millions of won Acquisition cost ￦ 98,166 7,481 — 105,647 Less: Accumulated impairment — — — — Carrying book value ￦ 98,166 7,482 — 105,647
Summary of Cash Dividends Received from Subsidiaries	(9) Cash dividends received from subsidiaries for the years ended December 31, 2019, 2020 and 2021, respectively, are as follows: Subsidiaries 2019 2020 2021 In millions of won Korea Hydro & Nuclear Power Co., Ltd. ￦ — 106,675 279,779 Korea South-East Power Co., Ltd. 7,143 11,905 — Korea Midland Power Co., Ltd. — — — Korea Western Power Co., Ltd. — — — Korea Southern Power Co., Ltd. 15,277 — — Korea East-West Power Co., Ltd. 985 17,959 — KEPCO Engineering & Construction Company, Inc. 3,519 7,793 7,089 KEPCO Plant Service & Engineering Co., Ltd. 41,084 44,068 26,301 KEPCO Nuclear Fuel Co., Ltd. 4,219 7,270 5,206 KEPCO KDN Co., Ltd. 19,136 14,720 18,854 KEPCO International HongKong Ltd. 10,243 11,858 — KEPCO International Philippines Inc. 70,480 — — KEPCO Ilijan Corporation 65,776 34,502 7,955 KEPCO Philippines Holdings Inc. 63,522 70,876 60,520 KOSEP Australia Pty., Ltd. 8,120 1,856 — KOSPO Australia Pty., Ltd. 4,335 — 3,095 Qatrana Electric Power Company 10,313 — 2,615 KEPCO KPS Philippines Corp. 3,854 1,215 — Tamra Offshore Wind Power Co., Ltd. 4,823 2,640 — KEPCO Netherlands S3 B.V. 874 6,981 — PT. KOMIPO Pembangkitan Jawa Bali 1,971 — 153 KEPCO Netherlands J3 B.V. — — 27,237 Gyeongju Wind Power Co., Ltd. 2,800 2,800 2,800 VI Carbon Professional Private Special Asset Investment Trust 1 11 7 — KOSPO Power Services Limitada 745 — — KEPCO Netherlands B.V. 13,266 11,098 — PT. Cirebon Power Service — 221 — Chitose Solar Power Plant LLC 814 858 — Fujeij Wind Power Company — 6,306 11,920 KOSPO Jordan LLC — 535 731 Energy Innovation Fund I — 19 — ￦ 353,310 362,162 454,255

Investments in Associates and_2

Investments in Associates and Joint Ventures (Tables)	12 Months Ended
	Dec. 31, 2021
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, 2020 and 2021 are as follows: 2020 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 1,647,325 Korea Electric Power Industrial Development Co., Ltd. Electricity metering and others Korea 29.00 % 4,727 25,630 YTN Co., Ltd. Broadcasting Korea 21.43 % 59,000 40,549 Gangwon Wind Power Co., Ltd.(*2) Power generation Korea 15.00 % 5,725 11,443 Hyundai Green Power Co., Ltd. Power generation Korea 29.00 % 88,885 132,774 Korea Power Exchange(*3) Management of power market and others Korea 100.00 % 127,839 269,122 Taebaek Wind Power Co., Ltd. Power generation Korea 25.00 % 3,810 6,392 Taebaek Guinemi Wind Power Co., Ltd. Power generation Korea 25.00 % 3,420 3,087 Pyeongchang Wind Power Co., Ltd. Power generation Korea 25.00 % 3,875 5,027 Daeryun Power Co., Ltd.(*2) Power generation Korea 9.34 % 40,854 26,353 Changjuk Wind Power Co., Ltd. Power generation Korea 30.00 % 3,801 7,867 KNH Solar Co., Ltd. Power generation Korea 27.00 % 1,296 2,436 SPC Power Corporation Power generation Philippines 38.00 % 20,635 69,912 Gemeng International Energy Co., Ltd. Power generation China 34.00 % 413,153 679,708 PT. Cirebon Electric Power Power generation Indonesia 27.50 % 40,365 117,811 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 27,865 PT. Bayan Resources TBK Resources development Indonesia 20.00 % 615,860 425,234 S-Power Power generation Korea 49.00 % 132,300 110,292 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 generation Laos 25.00 % 87,426 64,570 Hadong Mineral Fiber Co., Ltd.(*2) Recycling fly ashes Korea 8.33 % 50 — PT. Mutiara Jawa Manufacturing and operating floating coal terminal Indonesia 29.00 % 2,978 1,780 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 4,197 Goseong Green Power Co., Ltd.(*2) Power generation Korea 1.12 % 2,900 2,186 Gangneung Eco Power Co., Ltd.(*2) Power generation Korea 1.61 % 2,900 2,368 Shin Pyeongtaek Power Co., Ltd. Power generation Korea 40.00 % 72,000 69,591 Haeng Bok Do Si Photovoltaic Power Co., Ltd. Power generation Korea 28.00 % 194 210 Dongducheon Dream Power Co., Ltd.(*6) Power generation Korea 33.61 % 148,105 80,637 Jinbhuvish Power Generation Pvt. Ltd.(*2, 7) Power generation India 5.16 % 9,000 — Daejung Offshore Wind Power Co., Ltd. Power generation Korea 46.59 % 5,190 2,165 GS Donghae Electric Power Co., Ltd. Power generation Korea 34.00 % 204,000 244,426 Daegu Photovoltaic Co., Ltd. Power generation Korea 29.00 % 1,230 2,066 Busan Green Energy Co., Ltd. Power generation Korea 29.00 % 5,243 8,778 Gunsan Bio Energy Co., Ltd.(*2) Power generation Korea 18.87 % 1,000 — Korea Electric Vehicle Charging Service Electric vehicle charge service Korea 28.00 % 2,800 576 Korea Nuclear Partners Co., Ltd. Electric material agency Korea 28.98 % 537 200 Korea Electric Power Corporation Fund(*8) Developing electric enterprises Korea 98.09 % 51,500 41,926 Energy Infra Asset Management Co., Ltd.(*2) Asset management Korea 9.90 % 297 938 Daegu clean Energy Co., Ltd. Renewable power generation Korea 28.00 % 140 12 Yaksu ESS Co., Ltd. Installing ESS related equipment Korea 29.00 % 210 454 Nepal Water & Energy Development Company Private Limited(*9) Construction and operation of utility plant Nepal 60.35 % 50,268 42,677 Gwangyang Green Energy Co., Ltd. Power generation Korea 20.00 % 2,000 926 PND S Power generation Korea 29.00 % 1,250 1,149 Hyundai Eco Energy Co., Ltd.(*2) Power generation Korea 19.00 % 3,610 4,250 YeongGwang Yaksu Wind Electric Co., Ltd.(*2) Power generation Korea 9.63 % 533 312 Green Energy Electricity Generation Co., Ltd. Power generation Korea 29.00 % 1,189 25 Korea Energy Solutions Co., Ltd. R & D Korea 20.00 % 300 197 ITR Co., Ltd. R & D Korea 20.00 % 50 40 Structure test network Co., Ltd. Technical testing and consulting Korea 20.00 % 25 27 Namjeongsusang Solar Power Operation Co., Ltd.(*10) Power generation Korea 15.00 % 969 103 2020 Investees Key operation activities Location Percentage of Acquisition Book value In millions of won Indeck Niles Development, LLC(*11) Power generation USA 24.08 % ￦ 45,562 20,627 Indeck Niles Asset Management, LLC Power generation USA 33.33 % — 101 Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 Holding company Korea 49.00 % 7,300 7,326 Suwon New Power Co., Ltd. Power generation Korea 39.90 % 798 1,054 KPGE Inc. Power generation materials business Korea 29.00 % 287 287 Gwangbaek Solar Power Investment Co., Ltd. Power generation Korea 44.00 % 4,757 4,682 Go deok Clean Energy Co., Ltd.(*12) Fuel cell generation Korea 61.00 % 1,830 960 SureDataLab Co., Ltd. R & D Korea 23.95 % 126 85 SEP Co., Ltd. R & D Korea 21.26 % 27 14 Hankook Electric Power Information Co., Ltd. R & D Korea 25.25 % 38 139 Tronix Co., Ltd. R & D Korea 20.00 % 75 119 O2&B Global Co., Ltd. R & D Korea 20.00 % 25 22 Muan Sunshine Solar Power Plant Co., Ltd. Power generation Korea 20.00 % 1,570 1,096 Bigeum Resident Photovoltaic Power Co., Ltd. Power generation Korea 29.90 % 1 — Jeju SolarOne Co., Ltd.(*13) Power generation Korea 10.00 % 161 159 Goesan Solar Park Co., Ltd. Power generation Korea 29.00 % 1,276 1,684 Saemangeum Heemang Photovoltaic Co., Ltd. Power generation Korea 35.00 % 11,022 11,022 Bitgoel Eco Energy Co., Ltd. Power generation Korea 29.00 % 29 29 Jeju Gimnyeong Wind Power Co., Ltd. Power generation Korea 30.00 % 714 1,578 Seoroseoro Sunny Power Plant Co., Ltd.(*14) Power generation Korea 19.46 % 230 230 Muan Solar Park Co., Ltd.(*14) Power generation Korea 19.00 % 4,180 4,180 YuDang Solar Co., Ltd. Power generation Korea 20.00 % 360 360 Anjwa Smart Farm & Solar City Co., Ltd.(*14) Power generation Korea 19.50 % 5,510 5,510 Daewon Green Energy Co., Ltd. Power generation Korea 25.36 % 3,910 3,910 2,481,761 4,250,787 <Joint ventures> KEPCO-Uhde Inc.(*15) Power generation Korea 52.80 % 11,355 100 Shuweihat Asia Power Investment B.V. Holding company Netherlands 49.00 % 44,405 13,264 Shuweihat Asia Operation & Maintenance Company(*15) Maintenance of utility plant Cayman 55.00 % 30 1,057 Waterbury Lake Uranium L.P. Resources development Canada 33.10 % 26,602 19,797 ASM-BG Power generation Bulgaria 50.00 % 16,101 18,200 RES Technology AD Power generation Bulgaria 50.00 % 15,595 15,930 KV Holdings, Inc. Power generation Philippines 40.00 % 2,103 2,405 KEPCO SPC Power Corporation(*15) Construction and operation of utility plant Philippines 75.20 % 94,579 201,663 Gansu Datang Yumen Wind Power Co., Ltd. Power generation China 40.00 % 16,621 6,530 Datang Chifeng Renewable Power Co., Ltd. Power generation China 40.00 % 121,928 188,478 Datang KEPCO Chaoyang Renewable Power Co., Ltd. Power generation China 40.00 % 39,872 42,530 Rabigh Electricity Company Power generation Saudi Arabia 40.00 % 109,743 97,157 Rabigh Operation & Maintenance Company Limited Maintenance of utility plant Saudi Arabia 40.00 % 70 3,813 Jamaica Public Service Company Limited Power generation Jamaica 40.00 % 301,910 266,221 KW Nuclear Components Co., Ltd. Manufacturing Korea 45.00 % 833 11,171 Busan Shinho Solar Power Co., Ltd. Power generation Korea 25.00 % 2,100 5,378 Global Trade Of Power System Co., Ltd.(*16) Exporting products and technology of small or medium business by proxy Korea 29.00 % 290 546 Expressway Solar-light Power Generation Co., Ltd.(*16) Power generation Korea 29.00 % 1,856 2,896 Amman Asia Electric Power Company(*15) Power generation Jordan 60.00 % 111,476 161,253 KAPES, Inc.(*15) R & D Korea 51.00 % 5,629 — Honam Wind Power Co., Ltd. Power generation Korea 29.00 % 3,480 3,887 Jeongam Wind Power Co., Ltd. Power generation Korea 40.00 % 5,580 4,620 Korea Power Engineering Service Co., Ltd. Construction and service Korea 29.00 % 290 5,362 Chun-cheon Energy Co., Ltd. Power generation Korea 29.90 % 52,700 27,518 Yeonggwangbaeksu Wind Power Co., Ltd.(*16) Power generation Korea 15.00 % 3,000 3,124 Nghi Son 2 Power LLC Power generation Vietnam 50.00 % 2,781 — Kelar S.A.(*15) Power generation Chile 65.00 % 78,060 71,449 2020 Investees Key operation activities Location Percentage of Acquisition Book value In millions of won PT. Tanjung Power Indonesia Power generation Indonesia 35.00 % ￦ 26,892 33,063 Incheon New Power Co., Ltd.(*17) Power generation Korea 29.00 % 461 — Seokmun Energy Co., Ltd. Power generation Korea 29.00 % 15,370 14,814 Daehan Wind Power PSC Power generation Jordan 50.00 % 7,493 — Barakah One Company(*18) Power generation UAE 18.00 % 118 — Nawah Energy Company(*18) Operation of utility plant UAE 18.00 % 296 270 Momentum International thermonuclear experimental reactor construction management France 33.33 % 1 565 Daegu Green Power Co., Ltd.(*19) Power generation Korea 29.00 % 46,225 23,045 Yeonggwang Wind Power Co., Ltd. Power generation Korea 46.00 % 17,475 17,256 Chester Solar IV SpA Power generation Chile 45.00 % 1,700 1,064 Chester Solar V SpA Power generation Chile 45.00 % 525 277 Diego de Almagro Solar SpA Power generation Chile 45.00 % 2,091 1,490 South Jamaica Power Company Limited Power generation Jamaica 20.00 % 20,521 31,897 Daesan Green Energy Co., Ltd. Power generation Korea 35.00 % 17,850 22,552 RE Holiday Holdings LLC Power generation USA 50.00 % 42,948 68,809 RE Pioneer Holdings LLC Power generation USA 50.00 % 27,891 49,639 RE Barren Ridge 1 Holdings LLC Power generation USA 50.00 % 28,021 4,466 RE Astoria 2 LandCo LLC Power generation USA 50.00 % 5,188 5,230 RE Barren Ridge LandCo LLC Power generation USA 50.00 % 2,187 1,847 Laurel SpA Power generation Chile 45.00 % 1,222 1,092 KIAMCO KOWEPO Bannerton Hold Co Pty Ltd(*16) Power generation Australia 12.37 % 4,095 4,129 Chile Solar JV SpA Power generation Chile 50.00 % 37,689 34,883 Taebaek Gadeoksan Wind Power Co., Ltd. Power generation Korea 47.31 % 12,570 13,362 Cheong-Song Noraesan Wind Power Co., Ltd. Power generation Korea 29.01 % 3,200 3,453 Chester Solar I SpA Power generation Chile 45.00 % 1,181 1,621 Solar Philippines Calatagan Corporation Power generation Philippines 38.00 % 47,903 49,017 Saemangeum Solar Power Co., Ltd.(*20) Power generation Korea 81.00 % 26,399 24,292 Chungsongmeon BongSan wind power Co., Ltd.(*16) Power generation Korea 29.00 % 2,900 4,124 Jaeun Resident Wind Power Plant Co., Ltd.(*16) Power generation Korea 29.00 % 2,494 2,195 DE Energia SpA Power generation Chile 49.00 % 8,364 8,187 Dangjin Eco Power Co., Ltd. Power generation Korea 34.00 % 25,661 25,523 Haemodum Solar Co., Ltd. Power generation Korea 49.00 % 2,940 3,065 Yangyang Wind Power Co., Ltd. Power generation Korea 50.00 % 10,800 10,485 Horus Solar, S.A. De C.V.(*21) Renewable power generation Mexico 14.95 % 5,068 3,394 Recursos Solares PV De Mexico II, S.A. De C.V.(*21) Renewable power generation Mexico 14.95 % 3,678 3,660 Sunmex Renovables, S.A. De C.V.(*21) Renewable power generation Mexico 14.95 % 307 240 Stavro Holding II A.B. Holding company Sweden 20.00 % 8,829 9,277 Solaseado Solar Power Co., Ltd. Power generation Korea 38.90 % 7,020 9,915 Yeongam Solar Power Co., Ltd.(*16) Power generation Korea 19.00 % 6,460 6,042 Samsu Wind Power Co., Ltd.(*16) Power generation Korea 19.00 % 2,637 2,607 Pulau Indah Power Plant Sdn. Bhd. Power generation Malaysia 25.00 % 11,569 11,204 Sam-Yang Power generation Korea 49.00 % 5,245 5,535 NH-Amundi Holding company Korea 29.53 % 20,952 22,242 Shin-han Holding company Korea 90.00 % 15,699 16,129 PT Barito Wahana Tenaga Power generation Indonesia 30.61 % 59,395 63,029 Cheongna Energy Co., Ltd.(*20, 22) Generating and distributing vapor and hot/cold water Korea 50.10 % 49,344 4,940 Naepo Green Energy Co., Ltd.(*23) Power generation Korea 29.20 % 29,200 — Dayone Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.)(*24) Power generation Korea 30.66 % 71,070 — OneEnergy Asia Limited Power generation Vietnam 40.00 % 56,654 56,654 KAS Investment I LLC(*25) Holding company USA 29.89 % 23,437 23,437 KAS Investment II LLC(*25) Holding company USA 29.89 % 23,343 23,343 Energyco LLC Power generation Korea 29.00 % 1,659 1,659 2020 Investees Key operation activities Location Percentage of Acquisition Book value In millions of won CAES, LLC Holding company USA 36.00 % ￦ 19,414 17,626 Hapcheon Floating Photovoltaic Power Plant Inc.(*16) Power generation Korea 19.47 % 1,890 1,890 Busan Industrial Solar Power Co., Ltd. Power generation Korea 28.02 % 510 510 Bitsolar Energy Co., Ltd. Power generation Korea 27.10 % 352 352 1,943,392 1,919,746 ￦ 4,425,153 6,170,533 (*1) The effective percentage of ownership is 22.02% considering treasury stocks. (*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 Company recognized a full impairment loss for the carrying amount of Jinbhuvish Power Generation Pvt. Ltd. before the prior year, due to the Company’s decision to withdraw its business since there are no business activities occurring. (*8) 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. (*9) 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. (*10) 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. (*11) According to the shareholders’ agreement, additional investment of 50% of total stake is agreed by March 2022. (*12) Even though the effective percentage of ownership is more than 50%, the Company does not hold control over the entity as it has less than 50% of decision-making rights. However the Company can exercise significant influence on the entity by participating in the board of directors and others.Therefore the entity is classified as an associate. (*13) It was newly invested during the year ended December 31, 2020. The effective percentage of ownership is less than 20%. However, it is classified as an associate, judging that the Company can exercise significant influence on the entity. (*14) The entities were newly invested during the year ended December 31, 2020. The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint a director to the board of directors of the entity. (*15) 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. (*16) According to the shareholders’ agreement, the parties have joint control over all decisions related to financial and operation. Accordingly, the entity is classified as joint ventures. (*17) 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. (*18) The effective percentage of ownership is less than 20%. However, all operation related decisions must be agreed by ownership parties. Accordingly, the entity is classified as joint ventures. (*19) Although the nominal percentage of ownership is 29.00%, the effective percentage of ownership is 54.24%, considering the interest of financial investors as a liability component. (*20) The effective percentage of ownership is more than 50%. However, all operation related decisions must be agreed by all ownership parties. Accordingly, the entity is classified as a joint venture. (*21) 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. (*22) The classification of the entity was changed from an associate to a joint venture, due to the additional investment during the year ended December 31, 2020. (*23) The percentage of ownership decreased due to the unequal capital increase. The entity was reclassified from an associate to a joint venture, due to the changes in voting rights. (*24) The name of the entity has changed during the current year. According to the Dayone Energy Co., Ltd. (formerly, Hyundai 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. (formerly, Hyundai 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. (*25) The entities were included in the joint ventures due to the new investment during the year ended December 31, 2020. Since the final settlement of the entity was not completed before the Company’s financial statements date, the financial statements of October 7, were used for consolidation. 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 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 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. (formerly, Korea Nuclear Partners 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 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 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 2021 Investees Key operation activities Location Percentage of Acquisition Book value In millions of won 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 P 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 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 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 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 2021 Investees Key operation activities Location Percentage of Acquisition Book value In millions of won 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 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 Power generation Korea 49.00 % 5,245 4,993 NH-Amundi Holding company Korea 29.53 % 19,983 21,456 Shin-han Holding company Korea 90.00 % 15,699 16,288 2021 Investees Key operation activities Location Percentage of Acquisition Book value In millions of won 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 Limi
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, 2020 and 2021 are as follows: Investees 2020 2021 In millions of won <Associates> Korea Electric Power Industrial Development Co., Ltd. ￦ 45,048 115,339 Korea Gas Corporation(*) 584,010 738,990 YTN Co., Ltd. 27,000 26,550 SPC Power Corporation 139,698 203,589 PT. Bayan Resources TBK 798,510 1,495,801 (*) An indicator of impairment has been identified for the Company’s investment in Korea Gas Corporation (“KOGAS”) for the years ended December 31, 2020 and 2021 as management determined that the carrying amount of the investment in KOGAS at ￦1,647,325 million and ￦1,815,513 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, 2020 and 2021 are supported by the recoverable amount determination and as such, no impairment has been recognized for the years ended December 31, 2020 and 2021. 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 post-tax 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, 2020 and 2021 are as follows: 2020 Investees Beginning Acquisitions Disposals Dividends Share of (loss) Other (loss) Others Ending In millions of won <Associates> Korea Gas Corporation ￦ 1,693,967 — — (7,182 ) (14,104 ) (25,023 ) (333 ) 1,647,325 Korea Electric Power Industrial Development Co., Ltd. 25,393 — — (2,146 ) 3,806 — (1,423 ) 25,630 YTN Co., Ltd. 39,747 — — (90 ) 1,086 (6 ) (188 ) 40,549 Cheongna Energy Co., Ltd. 1,411 990 — — 2,518 — (4,919 ) — Gangwon Wind Power Co., Ltd. 12,327 — — (1,988 ) 1,104 — — 11,443 Hyundai Green Power Co., Ltd. 124,253 — — (8,889 ) 17,410 — — 132,774 Korea Power Exchange 258,899 — — — 1,860 1 8,362 269,122 Dayone Energy Co., Ltd. — — — — — — — — Ecollite Co., Ltd.(*1) — — — — — — — — Taebaek Wind Power Co., Ltd. 7,039 — — (175 ) (472 ) — — 6,392 Taebaek Guinemi Wind Power Co., Ltd. 2,553 — — — 534 — — 3,087 Pyeongchang Wind Power Co., Ltd. 5,877 — — (813 ) (37 ) — — 5,027 Daeryun Power Co., Ltd. 26,247 — — — 104 — 2 26,353 Changjuk Wind Power Co., Ltd. 8,520 — — (750 ) 97 — — 7,867 KNH Solar Co., Ltd. 2,382 — — — 54 — — 2,436 SPC Power Corporation 63,583 — — (10,764 ) 5,491 11,649 (47 ) 69,912 Gemeng International Energy Co., Ltd. 670,896 — — (11,620 ) 15,965 4,468 (1 ) 679,708 PT. Cirebon Electric Power 123,425 — — (9,782 ) 11,330 434 (7,596 ) 117,811 KNOC Nigerian East Oil Co., Ltd. — — — — (22 ) 671 (649 ) — KNOC Nigerian West Oil Co., Ltd. — — — — (22 ) 617 (595 ) — PT Wampu Electric Power 29,355 — — (1,303 ) 3,245 (1,639 ) (1,793 ) 27,865 PT. Bayan Resources TBK 445,141 — — (15,720 ) 17,139 (21,256 ) (70 ) 425,234 S-Power 115,784 — — — (5,429 ) — (63 ) 110,292 Pioneer Gas Power Limited — — — — — — — — Eurasia Energy Holdings — — — — — — — — Xe-Pian Xe-Namnoy 72,935 — — — (2,896 ) (5,469 ) — 64,570 Hadong Mineral Fiber Co., Ltd. — — — — — — — — Green Biomass Co., Ltd. 108 — (108 ) — — — — — PT. Mutiara Jawa 1,438 — — — 459 (117 ) — 1,780 Samcheok Eco Materials Co., Ltd. — — — — — — — — Noeul Green Energy Co., Ltd. 6,610 — — — (2,413 ) — — 4,197 Naepo Green Energy Co., Ltd. — — — — (9,789 ) — 9,789 — Goseong Green Power Co., Ltd. 2,340 — — — (154 ) — — 2,186 Gangneung Eco Power Co., Ltd. 2,430 — — — (62 ) — — 2,368 Shin Pyeongtaek Power Co., Ltd. 66,956 — — — 11,877 (3,604 ) (5,638 ) 69,591 Haeng Bok Do Si Photovoltaic Power Co., Ltd. 215 — — — (5 ) — — 210 2020 Investees Beginning Acquisitions Disposals Dividends Share of (loss) Other (loss) Others Ending In millions of won Dongducheon Dream Power Co., Ltd. ￦ 76,547 — — — 4,095 — (5 ) 80,637 Jinbhuvish Power Generation Pvt. Ltd. — — — — — — — — Daejung Offshore Wind Power Co., Ltd. 2,361 — — — (411 ) — 215 2,165 GS Donghae Electric Power Co., Ltd. 255,983 — — (25,796 ) 14,265 — (26 ) 244,426 Daegu Photovoltaic Co., Ltd. 2,060 — — (325 ) 331 — — 2,066 Busan Green Energy Co., Ltd. 10,637 — — — (1,862 ) — 3 8,778 Gunsan Bio Energy Co., Ltd. — — — — — — — — Korea Electric Vehicle Charging Service 1,063 — — — (491 ) — 4 576 Korea Nuclear Partners Co., Ltd. — 247 — — (43 ) (4 ) — 200 Korea Electric Power Corporation Fund 41,126 — — — (908 ) 1,708 — 41,926 Energy Infra Asset Management Co., Ltd. 791 — — — 147 — — 938 Daegu clean Energy Co., Ltd. 13 — — — (1 ) — — 12 YaksuESS Co., Ltd. 516 — — — (62 ) — — 454 Nepal Water & Energy Development Company Private Limited 31,145 14,697 — — (1,699 ) (1,466 ) — 42,677 Gwangyang Green Energy Co., Ltd. 948 — — — (22 ) — — 926 PND Solar 1,144 — — — 5 — — 1,149 Hyundai Eco Energy Co., Ltd. 3,781 — — — 469 — — 4,250 YeongGwang Yaksu Wind Electric Co., Ltd. 386 — — — (74 ) — — 312 Green Energy Electricity Generation Co., Ltd. 163 — — — (138 ) — — 25 Korea Energy Solutions Co., Ltd. 259 — — — (62 ) — — 197 ITR Co., Ltd. 33 — — — 7 — — 40 Structure test network Co., Ltd. 21 — — — 6 — — 27 Namjeongsusang Solar Power Operation Co., Ltd. 812 — — — (709 ) — — 103 Indeck Niles Development, LLC — 45,562 — — (13,344 ) (9,846 ) (1,745 ) 20,627 Indeck Niles Asset Management, LLC 87 — — (539 ) 559 — (6 ) 101 Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 7,126 294 (99 ) (291 ) 296 — — 7,326 Suwon New Power Co., Ltd. 798 — — — 256 — — 1,054 KPGE Inc. 287 — — — — — — 287 Gwangbaek Solar Power Investment Co., Ltd. 2,054 2,703 — — (75 ) — — 4,682 Go deok Clean Energy Co., Ltd. 1,830 — — — (843 ) (27 ) — 960 SureDataLab Co., Ltd. — 126 — — (41 ) — — 85 SEP Co., Ltd. — 27 — — (13 ) — — 14 Hankook Electric Power Information Co., Ltd. — 38 — — 101 — — 139 Tronix Co., Ltd. — 75 — — 44 — — 119 O2&B Global Co., Ltd. — 25 — — (3 ) — — 22 Muan Sunshine Solar Power Plant Co., Ltd. — 79 — — (475 ) — 1,492 1,096 Bigeum Resident Photovoltaic Power Co., Ltd. — — — — — — — — Jeju SolarOne Co., Ltd. — 161 — — — (2 ) — 159 Energy Innovation Fund I — 4,000 — (2 ) (159 ) — (3,839 ) — Goesan Solar Park Co., Ltd. — 1,276 — — 408 — — 1,684 Saemangeum Heemang Photovoltaic Co., Ltd. — 11,022 — — — — — 11,022 Bitgoel Eco Energy Co., Ltd. — 29 — — — — — 29 Jeju Gimnyeong Wind Power Co., Ltd. — 714 — — 864 — — 1,578 2020 Investees Beginning Acquisitions Disposals Dividends Share of (loss) Other (loss) Others Ending In millions of won Seoroseoro Sunny Power Plant Co., Ltd. ￦ — 230 — — — — — 230 Muan Solar Park — 4,180 — — — — — 4,180 YuDang Solar Co., Ltd. — 360 — — — — — 360 Anjwa Smart Farm & Solar City Co., Ltd. — 5,510 — — — — — 5,510 Daewon Green Energy Co., Ltd. — 3,910 — — — — — 3,910 4,251,802 96,255 (207 ) (98,175 ) 59,092 (48,911 ) (9,069 ) 4,250,787 <Joint ventures> KEPCO-Uhde Inc. 134 — — — (34 ) — — 100 Shuweihat Asia Power Investment B.V. 18,318 — — (4,337 ) 5,919 (6,636 ) — 13,264 Shuweihat Asia Operation & Maintenance Company 1,408 — — (922 ) 1,074 (503 ) — 1,057 Waterbury Lake Uranium L.P. 20,562 — — — 4 (769 ) — 19,797 ASM-BG 19,376 — — (4,206 ) 2,575 455 — 18,200 RES Technology AD 16,248 — — (1,981 ) 1,051 612 — 15,930 KV Holdings, Inc. 2,441 — — (617 ) 580 1 — 2,405 KEPCO SPC Power Corporation 214,794 — — (48,486 ) 48,479 (12,995 ) (129 ) 201,663 Gansu Datang Yumen Wind Power Co., Ltd. 8,149 — — — (1,718 ) 99 — 6,530 Datang Chifeng Renewable Power Co., Ltd. 185,307 — — (13,453 ) 15,317 1,307 — 188,478 Datang KEPCO Chaoyang Renewable Power Co., Ltd. 41,024 — — — 1,231 275 — 42,530 Rabigh Electricity Company 109,096 — — (14,956 ) 25,474 (22,458 ) 1 97,157 Rabigh Operation & Maintenance Company Limited 6,879 — — (5,340 ) 2,788 (514 ) — 3,813 Jamaica Public Service Company Limited 253,607 — — (4,352 ) 24,669 (10,891 ) 3,188 266,221 KW Nuclear Components Co., Ltd. 9,052 — — (833 ) 2,952 — — 11,171 Busan Shinho Solar Power Co., Ltd. 5,045 — — (330 ) 663 — — 5,378 Global Trade Of Power System Co., Ltd. 571 — — — (25 ) — — 546 Expressway Solar-light Power Generation Co., Ltd. 2,883 — — — 13 — — 2,896 Amman Asia Electric Power Company 192,164 — — (28,281 ) 20,165 (22,795 ) — 161,253 KAPES, Inc. 10,832 — — — (10,806 ) — (26 ) — Honam Wind Power Co., Ltd. 4,375 — — (435 ) (53 ) — — 3,887 Jeongam Wind Power Co., Ltd. 4,437 — — — 183 — — 4,620 Korea Power Engineering Service Co., Ltd. 4,902 — — — 446 — 14 5,362 Chun-cheon Energy Co., Ltd. 34,872 — — — (7,354 ) — — 27,518 Yeonggwangbaeksu Wind Power Co., Ltd. 3,040 — — — 84 — — 3,124 Nghi Son 2 Power LLC — — — — — — — — Kelar S.A. 70,462 — — — 14,864 (9,186 ) (4,691 ) 71,449 PT. Tanjung Power Indonesia 34,327 — — — 7,522 (9,220 ) 434 33,063 Incheon New Power Co., Ltd. — — — — — — — — Seokmun Energy Co., Ltd. 17,342 — — — (2,528 ) — — 14,814 Daehan Wind Power PSC 1,757 4,302 — — (626 ) (5,433 ) — — Barakah One Company — — — — — — — — Nawah Energy Company 285 — — — 2 (17 ) — 270 Momentum 553 — — (404 ) 399 17 — 565 Daegu Green Power Co., Ltd. 22,824 — — — 128 — 93 23,045 Yeonggwang Wind Power Co., Ltd. 17,627 — — — (371 ) — — 17,256 Chester Solar IV SpA 672 — — — 389 80 (77 ) 1,064 Chester Solar V SpA 146 — — — 135 17 (21 ) 277 Diego de Almagro Solar SpA 1,035 — — — 455 107 (107 ) 1,490 South Jamaica Power Company Limited 13,863 — — — 20,468 (2,432 ) (2 ) 31,897 Daesan Green Energy Co., Ltd. 17,182 — — — 5,371 — (1 ) 22,552 2020 Investees Beginning Acquisitions Disposals Dividends Share of (loss) Other (loss) Others Ending In millions of won RE Holiday Holdings LLC ￦ 42,070 — — — 33,072 (6,333 ) — 68,809 RE Pioneer Holdings LLC 31,156 — — (1,246 ) 24,466 (4,737 ) — 49,639 RE Barren Ridge 1 Holdings LLC 42,916 — — (872 ) (35,735 ) (1,843 ) — 4,466 RE Astoria 2 LandCo LLC 5,602 — — (249 ) 210 (333 ) — 5,230 RE Barren Ridge LandCo LLC 1,966 — — (95 ) 95 (119 ) — 1,847 Laurel SpA 595 — — — 498 80 (81 ) 1,092 KIAMCO KOWEPO Bannerton Hold Co Pty Ltd 4,024 — — — (24 ) 129 — 4,129 Chile Solar JV SpA 34,859 — — — 187 (163 ) — 34,883 Taebaek Gadeoksan Wind Power Co., Ltd. 7,846 4,070 — — 1,468 (22 ) — 13,362 Cheong-Song Noraesan Wind Power Co., Ltd. 3,043 — — — 409 — 1 3,453 Chester Solar I SpA 1,157 — — — 472 107 (115 ) 1,621 Solar Philippines Calatagan Corporation 48,930 — — (6,439 ) 6,745 (219 ) — 49,017 Saemangeum Solar Power Co., Ltd. 8,324 16,399 — — (431 ) — — 24,292 Chungsongmeon BongSan wind power Co., Ltd. 2,764 — — — (232 ) 1,592 — 4,124 Jaeun Resident Wind Power Plant Co., Ltd. 2,198 — — — (3 ) — — 2,195 DE Energia SpA 8,665 — — — 506 572 (1,556 ) 8,187 Dangjin Eco Power Co., Ltd. 25,661 — — — 96 (237 ) 3 25,523 Haemodum Solar Co., Ltd. 2,940 — — — 140 (15 ) — 3,065 Yangyang Wind Power Co., Ltd. 10,800 — — — (286 ) (29 ) — 10,485 Horus Solar, S.A. DE C.V. 3,403 1,665 — — (1,985 ) 311 — 3,394 Recursos Solares PV De Mexico II, S.A. De C.V. 672 3,006 — — 36 (54 ) — 3,660 Sunmex Renovables, S.A. De C.V. 222 85 — — (46 ) (21 ) — 240 Stavro Holding II A.B. 5,625 3,305 — — (156 ) 346 157 9,277 Solaseado Solar Power Co., Ltd. — 7,020 — — 2,895 — — 9,915 Yeongam Solar Power Co., Ltd. — 6,460 — — (418 ) — — 6,042 Samsu Wind Power Co., Ltd. — 2,637 — — (30 ) — — 2,607 Pulau Indah Power Plant Sdn. Bhd. — 11,569 — — (144 ) (221 ) — 11,204 Sam-Yang — 5,245 — — 290 — — 5,535 NH-Amundi — 20,952 — (1,388 ) 2,678 — — 22,242 Shin-han — 15,699 — — 430 — — 16,129 PT Barito Wahana Tenaga — 59,395 — — 4,923 (1,289 ) — 63,029 Cheongna Energy Co., Ltd. — — — — 21 — 4,919 4,940 Naepo Green Energy Co., Ltd. — — — — — — — — Dayone Energy Co., Ltd. — — — — — — — — OneEnergy Asia Limited — 56,654 — — — — — 56,654 KAS Investment I LLC — 23,437 — — — — — 23,437 KAS Investment II LLC — 23,343 — — — — — 23,343 Energyco LLC — 1,659 — — — — — 1,659 CAES, LLC — 19,414 — (297 ) — — (1,491 ) 17,626 Hapcheon Floating Photovoltaic Power Plant Inc. — 1,890 — — — — — 1,890 Busan Industrial Solar Power Co., Ltd. — 510 — — — — — 510 Bitsolar Energy Co., Ltd. — 352 — — — — — 352 1,663,029 289,068 — (139,519 ) 220,032 (113,377 ) 513 1,919,746 ￦ 5,914,831 385,323 (207 ) (237,694 ) 279,124 (162,288 ) (8,556 ) 6,170,533 (*1) The Company recognized a impairment loss for the carrying amount of Ecollite Co., Ltd. during the prior period due to the suspension of operating activities. Ecollite Co., Ltd. has been removed from associates since it is under the process of liquidation as of December 31, 2020. 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 110,292 — — — 12,437 57 — 122,786 Pioneer Gas Power Limited — — — — — — — — Eurasia Energy Holdings — — — — — — — — Xe-Pian Xe-Namnoy 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. (formerly, Korea Nuclear Partners 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 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 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 2021 Investees Beginning Acquisitions Disposals Dividends Share of (loss) Other (loss) Others Ending In millions of won 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 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 — — — — — — — — 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 2021 Investees Beginning Acquisitions Disposals Dividends Share of (loss) Other (loss) Others Ending In millions of won <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 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 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 2021 Investees Beginning Acquisitions Disposals Dividends Share of (loss) Other (loss) Others Ending In millions of won 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 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 5,535 — — — (542 ) — — 4,993 NH-Amundi 22,242 — (969 ) (1,727 ) 1,910 — — 21,456 Shin-han 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. (formerly, Energyco LLC) 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 — 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
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, 2020 and 2021 are as follows: 2020 Investees Total assets Total liabilities Sales Profit (loss) for the period In millions of won <Associates> Korea Gas Corporation(*1) ￦ 35,909,775 28,174,619 20,833,722 (172,060 ) Korea Electric Power Industrial Development Co., Ltd. 164,015 75,636 297,962 16,284 YTN Co., Ltd. 295,151 105,923 126,730 7,095 Gangwon Wind Power Co., Ltd. 77,297 1,336 23,350 7,472 Hyundai Green Power Co., Ltd. 874,574 416,732 390,442 55,591 Korea Power Exchange 337,577 68,455 104,698 979 Taebaek Wind Power Co., Ltd. 28,048 2,480 4,364 (561 ) Taebaek Guinemi Wind Power Co., Ltd. 44,434 32,085 5,023 1,368 Pyeongchang Wind Power Co., Ltd. 72,713 52,606 8,387 (154 ) Daeryun Power Co., Ltd. 789,277 498,346 126,343 1,941 Changjuk Wind Power Co., Ltd. 27,515 1,292 4,777 656 KNH Solar Co., Ltd. 18,240 9,219 3,564 728 SPC Power Corporation 255,462 17,705 47,091 39,677 Gemeng International Energy Co., Ltd. 7,427,157 5,428,013 1,955,707 64,077 PT. Cirebon Electric Power 730,020 301,615 246,014 40,676 KNOC Nigerian East Oil Co., Ltd. 22,215 93,736 — (142 ) KNOC Nigerian West Oil Co., Ltd. 23,999 89,739 — (142 ) PT Wampu Electric Power 199,841 139,264 20,265 7,372 PT. Bayan Resources TBK 1,544,875 795,131 1,646,390 219,406 S-Power 782,561 554,393 421,519 (10,805 ) Pioneer Gas Power Limited 260,344 359,790 — (44,568 ) Eurasia Energy Holdings 556 993 — — Xe-Pian Xe-Namnoy 1,138,994 876,336 140,069 (11,318 ) Hadong Mineral Fiber Co., Ltd. 203 231 — — PT. Mutiara Jawa 23,061 16,923 7,946 2,523 Samcheok Eco Materials Co., Ltd. 24,024 598 10,483 23 Noeul Green Energy Co., Ltd. 116,929 102,457 27,486 (8,303 ) Goseong Green Power Co., Ltd. 4,559,480 4,351,119 — (12,280 ) Gangneung Eco Power Co., Ltd. 2,630,752 2,475,848 — (3,623 ) Shin Pyeongtaek Power Co., Ltd. 1,020,650 814,369 520,468 32,002 Haeng Bok Do Si Photovoltaic Power Co., Ltd. 2,001 1,258 387 (11 ) Dongducheon Dream Power Co., Ltd. 1,374,640 1,095,926 524,890 10,982 Jinbhuvish Power Generation Pvt. Ltd. 58,699 12,122 — — Daejung Offshore Wind Power Co., Ltd. 6,281 1,634 — (810 ) GS Donghae Electric Power Co., Ltd. 2,174,835 1,455,935 685,579 41,955 Daegu Photovoltaic Co., Ltd. 13,843 6,718 3,343 1,149 Busan Green Energy Co., Ltd. 170,261 139,995 40,241 (6,422 ) Gunsan Bio Energy Co., Ltd. 9,340 28,322 — (1,501 ) Korea Electric Vehicle Charging Service 8,173 6,116 10,807 (1,756 ) Korea Nuclear Partners Co., Ltd. 1,350 105 1,062 (150 ) Korea Electric Power Corporation Fund 42,988 249 82 (730 ) Energy Infra Asset Management Co., Ltd. 10,424 946 5,130 1,488 Daegu clean Energy Co., Ltd. 368 324 — (1 ) Yaksu ESS Co., Ltd. 6,584 5,022 217 (212 ) Nepal Water & Energy Development Company Private Limited 109,321 41,093 — (444 ) Gwangyang Green Energy Co., Ltd. 28,634 24,095 — (113 ) PND Solar 38,997 35,566 5,129 (121 ) Hyundai Eco Energy Co., Ltd. 195,040 173,800 24,166 4,280 YeongGwang Yaksu Wind Electric Co., Ltd. 43,039 42,915 5,802 (637 ) Green Energy Electricity Generation Co., Ltd. 53,934 56,533 — (920 ) Korea Energy Solutions Co., Ltd. 1,009 25 78 (280 ) ITR Co., Ltd. 418 220 153 (66 ) Structure test network Co., Ltd. 101 234 99 27 Namjeongsusang Solar Power Operation Co., Ltd. 63,041 62,488 1,128 (4,655 ) Indeck Niles Development, LLC 772,124 738,826 — (29,392 ) Indeck Niles Asset Management, LLC 314 11 2,272 1,139 2020 Investees Total assets Total liabilities Sales Profit (loss) for the period In millions of won Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 ￦ 15,157 206 634 603 Suwon New Power Co., Ltd. 1,974 8 — — KPGE Inc. 1,021 32 354 5 Gwangbaek Solar Power Investment Co., Ltd. 339,223 329,298 13,192 (329 ) Go deok Clean Energy Co., Ltd. 1,639 65 — (1,382 ) SureDataLab Co., Ltd. 400 47 303 (108 ) SEP Co., Ltd. 164 100 — (63 ) Hankook Electric Power Information Co., Ltd. 1,163 613 1,208 390 Tronix Co., Ltd. 942 349 2,030 (6 ) O2&B Global Co., Ltd. 233 125 285 (57 ) Muan Sunshine Solar Power Plant Co., Ltd. 147,908 144,898 6,017 (2,365 ) Bigeum Resident Photovoltaic Power Co., Ltd. 11,164 11,551 — (309 ) Jeju SolarOne Co., Ltd. 1,608 14 — (4 ) Goesan Solar Park Co., Ltd. 56,332 50,524 2,809 (262 ) Saemangeum Heemang Photovoltaic Co., Ltd. 35,447 6,070 — (1,943 ) Bitgoel Eco Energy Co., Ltd. 100 — — — Jeju Gimnyeong Wind Power Co., Ltd. 72,557 67,297 8,927 (1,576 ) Seoroseoro Sunny Power Plant Co., Ltd. 1,182 — — — Muan Solar Park Co., Ltd. 245,431 225,057 14,359 (966 ) YuDang Solar Co., Ltd. 23,360 20,876 1,611 686 Anjwa Smart Farm & Solar City Co., Ltd. 295,570 271,396 1,900 (1,684 ) Daewon Green Energy Co., Ltd. 15,370 122 — (93 ) <Joint ventures> KEPCO-Uhde Inc. 208 11 — (66 ) Shuweihat Asia Power Investment B.V. 27,073 4 — 12,080 Shuweihat Asia Operation & Maintenance Company 1,960 38 2,689 1,953 Waterbury Lake Uranium L.P. 59,885 77 — — ASM-BG 80,261 43,861 13,355 5,150 RES Technology AD 67,232 35,372 8,381 2,102 KV Holdings, Inc. 6,013 — 27 1,449 KEPCO SPC Power Corporation 289,271 21,102 184,481 66,311 Gansu Datang Yumen Wind Power Co., Ltd. 69,668 53,343 7,157 (4,295 ) Datang Chifeng Renewable Power Co., Ltd. 747,990 276,796 119,955 39,439 Datang KEPCO Chaoyang Renewable Power Co., Ltd. 182,342 76,018 26,378 2,914 Rabigh Electricity Company 2,294,880 1,898,701 293,722 94,927 Rabigh Operation & Maintenance Company Limited 28,666 19,133 26,268 7,318 Jamaica Public Service Company Limited 1,664,412 1,027,418 1,042,422 35,916 KW Nuclear Components Co., Ltd. 44,571 19,354 19,762 7,262 Busan Shinho Solar Power Co., Ltd. 39,266 17,754 7,296 2,652 Global Trade Of Power System Co., Ltd. 2,319 435 4,105 (96 ) Expressway Solar-light Power Generation Co., Ltd. 14,801 4,816 2,298 144 Amman Asia Electric Power Company 725,101 456,346 20,586 33,608 KAPES, Inc. 127,418 95,322 167,201 10,908 Honam Wind Power Co., Ltd. 36,237 22,945 4,433 (220 ) Jeongam Wind Power Co., Ltd. 89,829 78,279 9,757 412 Korea Power Engineering Service Co., Ltd. 24,162 5,674 9,435 1,538 Chun-cheon Energy Co., Ltd. 605,493 512,642 222,066 (24,597 ) Yeonggwangbaeksu Wind Power Co., Ltd. 90,758 69,967 11,232 572 Nghi Son 2 Power LLC 2,207,764 2,474,324 819,706 108,832 Kelar S.A. 598,901 492,838 93,375 16,863 PT. Tanjung Power Indonesia 645,152 550,687 90,255 20,487 Incheon New Power Co., Ltd. 3,439 2,914 1,519 (670 ) Seokmun Energy Co., Ltd. 227,539 176,457 33,677 (8,734 ) Daehan Wind Power PSC 98,544 106,254 — (765 ) Barakah One Company 24,693,571 24,924,087 — (4,520 ) 2020 Investees Total assets Total liabilities Sales Profit (loss) for the period In millions of won Nawah Energy Company ￦ 139,286 137,788 — 12 Momentum 10,772 9,076 31,161 1,122 Daegu Green Power Co., Ltd. 549,034 469,126 221,382 290 Yeonggwang Wind Power Co., Ltd. 249,999 213,556 26,535 1,690 Chester Solar IV SpA 14,232 11,990 1,688 485 Chester Solar V SpA 4,674 4,313 588 150 Diego de Almagro Solar SpA 17,916 14,808 1,824 535 South Jamaica Power Company Limited 405,804 246,310 209,596 12,208 Daesan Green Energy Co., Ltd. 275,911 211,476 62,286 15,346 RE Holiday Holdings LLC 320,908 183,290 19,659 13,247 RE Pioneer Holdings LLC 236,565 137,287 12,410 8,821 RE Barren Ridge 1 Holdings LLC 194,643 87,171 10,679 (722 ) RE Astoria 2 LandCo LLC 10,733 274 664 541 RE Barren Ridge LandCo LLC 3,776 82 266 223 Laurel SpA 13,529 11,496 1,704 702 KIAMCO KOWEPO Bannerton Hold Co Pty Ltd 33,930 618 — (191 ) Chile Solar JV SpA 74,776 5,011 4,390 1,476 Taebaek Gadeoksan Wind Power Co., Ltd. 142,731 114,487 10,587 2,411 Cheong-Song Noraesan Wind Power Co., Ltd. 55,460 43,771 7,411 2,039 Chester Solar I SpA 12,795 9,713 1,111 824 Solar Philippines Calatagan Corporation 97,947 47,098 23,182 15,249 Saemangeum Solar Power Co., Ltd. 34,363 4,180 — (532 ) Chungsongmeon BongSan wind power Co., Ltd. 64,341 56,264 — (1,206 ) Jaeun Resident Wind Power Plant Co., Ltd. 63,940 56,371 — (645 ) DE Energia SpA 48,327 54,934 3,789 (21,087 ) Dangjin Eco Power Co., Ltd. 97,834 23,769 3,953 565 Haemodum Solar Co., Ltd. 19,041 12,786 1,188 286 Yangyang Wind Power Co., Ltd. 20,917 33 — (572 ) Horus Solar, S.A. De C.V. 181,432 182,674 — (13,285 ) Recursos Solares PV De Mexico II, S.A. De C.V. 81,257 71,295 — 243 Sunmex Renovables, S.A. De C.V. 7,781 6,204 — (309 ) Stavro Holding II A.B. 46,394 9 — (782 ) Solaseado Solar Power Co., Ltd. 349,855 327,865 43,782 7,443 Yeongam Solar Power Co., Ltd. 312,960 285,231 17,347 (3,324 ) Samsu Wind Power Co., Ltd. 59,597 45,877 — 243 Pulau Indah Power Plant Sdn. Bhd. 31,538 9,293 — (894 ) Sam-Yang 55,345 44,049 2,769 592 NH-Amundi 73,573 39 1,770 8,989 Shin-han 17,932 11 6 478 PT Barito Wahana Tenaga 205,894 — — 28,631 Cheongna Energy Co., Ltd. 341,478 335,736 78,387 5,995 Naepo Green Energy Co., Ltd. 152,003 159,805 7,056 (28,043 ) Dayone Energy 441,875 496,355 93,832 30,269 OneEnergy Asia Limited 78,005 150 — (578 ) KAS Investment 78,410 — — — KAS Investment 78,096 — — — Energyco LLC 3,425 563 — (2,856 ) CAES, LLC 40,840 — — (1,656 ) Hapcheon Floating Photovoltaic Power Plant Inc. 9,708 — — — Busan Industrial Solar Power Co., Ltd. 15,283 14,499 19 (485 ) Bitsolar Energy Co., Ltd. 144,758 149,561 — (6,116 ) (*1) The loss for the year ended December 31, 2020 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 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 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. 5,412,537 4,509,791 740,028 51,450 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. (formerly, Korea Nuclear Partners 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 S 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 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 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 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 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 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 50,837 40,647 7,376 150 NH-Amundi 70,910 38 3,428 6,468 Shin-han 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 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. (formerly, Energyco LLC) 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 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
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, 2020 and 2021 are as follows: 2020 Investees Net assets Percentage Share in net Investment differential Intercompany transaction Others Book value In millions of won <Associates> Korea Gas Corporation ￦ 7,735,156 22.02 % 1,703,281 — — (55,956 ) 1,647,325 Korea Electric Power Industrial Development Co., Ltd. 88,379 29.00 % 25,630 — — — 25,630 YTN Co., Ltd. 189,228 21.43 % 40,549 — — — 40,549 Gangwon Wind Power Co., Ltd. 75,961 15.00 % 11,394 49 — — 11,443 Hyundai Green Power Co., Ltd. 457,842 29.00 % 132,774 — — — 132,774 Korea Power Exchange 269,122 100.00 % 269,122 — — — 269,122 Taebaek Wind Power Co., Ltd. 25,568 25.00 % 6,392 — — — 6,392 Taebaek Guinemi Wind Power Co., Ltd. 12,349 25.00 % 3,087 — — — 3,087 Pyeongchang Wind Power Co., Ltd. 20,107 25.00 % 5,027 — — — 5,027 Daeryun Power Co., Ltd. 290,931 9.34 % 27,173 — — (820 ) 26,353 Changjuk Wind Power Co., Ltd. 26,223 30.00 % 7,867 — — — 7,867 KNH Solar Co., Ltd. 9,021 27.00 % 2,436 — — — 2,436 SPC Power Corporation 237,757 38.00 % 90,348 — — (20,436 ) 69,912 Gemeng International Energy Co., Ltd. 1,999,144 34.00 % 679,709 — — (1 ) 679,708 PT. Cirebon Electric Power 428,405 27.50 % 117,811 — — — 117,811 KNOC Nigerian East Oil Co., Ltd. (71,521 ) 14.63 % (10,464 ) — — 10,464 — KNOC Nigerian West Oil Co., Ltd. (65,740 ) 14.63 % (9,618 ) — — 9,618 — PT Wampu Electric Power 60,577 46.00 % 27,865 — — — 27,865 PT. Bayan Resources TBK 749,744 20.00 % 149,949 351,662 — (76,377 ) 425,234 S-Power 228,168 49.00 % 111,802 — (1,510 ) — 110,292 Pioneer Gas Power Limited (99,446 ) 38.50 % (38,284 ) 22,278 — 16,006 — Eurasia Energy Holdings (437 ) 40.00 % (175 ) — — 175 — Xe-Pian Xe-Namnoy 262,658 25.00 % 65,665 305 (1,110 ) (290 ) 64,570 Hadong Mineral Fiber Co., Ltd. (28 ) 8.33 % (2 ) — — 2 — PT. Mutiara Jawa 6,138 29.00 % 1,780 — — — 1,780 Samcheok Eco Materials Co., Ltd. 23,426 25.54 % 5,983 — — (5,983 ) — Noeul Green Energy Co., Ltd. 14,472 29.00 % 4,197 — — — 4,197 Goseong Green Power Co., Ltd. 208,361 1.12 % 2,324 — (138 ) — 2,186 Gangneung Eco Power Co., Ltd. 154,904 1.61 % 2,496 — (128 ) — 2,368 Shin Pyeongtaek Power Co., Ltd. 206,281 40.00 % 82,512 3,559 (16,480 ) — 69,591 Haeng Bok Do Si Photovoltaic Power Co., Ltd. 743 28.00 % 208 — — 2 210 Dongducheon Dream Power Co., Ltd. 278,714 34.01 % 94,791 1,757 (3,329 ) (12,582 ) 80,637 Jinbhuvish Power Generation Pvt. Ltd. 46,577 5.16 % 2,403 — — (2,403 ) — Daejung Offshore Wind Power Co., Ltd. 4,647 46.59 % 2,165 — — — 2,165 GS Donghae Electric Power Co., Ltd. 718,900 34.00 % 244,426 — — — 244,426 Daegu Photovoltaic Co., Ltd. 7,125 29.00 % 2,066 — — — 2,066 Busan Green Energy Co., Ltd. 30,266 29.00 % 8,777 — — 1 8,778 Gunsan Bio Energy Co., Ltd. (18,982 ) 18.87 % (3,582 ) — — 3,582 — Korea Electric Vehicle Charging Service 2,057 28.00 % 576 — — — 576 Korea Nuclear Partners Co., Ltd. 1,245 28.98 % 361 — — (161 ) 200 Korea Electric Power Corporation Fund 42,739 98.09 % 41,923 — — 3 41,926 Energy Infra Asset Management Co., Ltd. 9,478 9.90 % 938 — — — 938 Daegu clean Energy Co., Ltd. 44 28.00 % 12 — — — 12 Yaksu ESS Co., Ltd. 1,562 29.00 % 453 1 — — 454 Nepal Water & Energy Development Company Private Limited 68,228 58.59 % 39,975 971 — 1,731 42,677 Gwangyang Green Energy Co., Ltd. 4,539 20.00 % 908 18 — — 926 PND S 3,431 29.00 % 995 154 — — 1,149 Hyundai Eco Energy Co., Ltd. 21,240 19.00 % 4,036 214 — — 4,250 YeongGwang Yaksu Wind Electric Co., Ltd. 124 9.63 % 12 300 — — 312 Green Energy Electricity Generation Co., Ltd. (2,599 ) 29.00 % (754 ) 779 — — 25 Korea Energy Solutions Co., Ltd. 984 20.00 % 197 — — — 197 ITR Co., Ltd. 198 20.00 % 40 1 — (1 ) 40 Structure test network Co., Ltd. (133 ) 20.00 % (27 ) 54 — — 27 2020 Investees Net assets Percentage Share in net Investment differential Intercompany transaction Others Book value In millions of won <Associates> Namjeongsusang Solar Power Operation Co., Ltd. ￦ 553 15.00 % 83 20 — — 103 Indeck Niles Development, LLC 33,298 24.08 % 8,017 12,610 — — 20,627 Indeck Niles Asset Management, LLC 303 33.33 % 101 — — — 101 Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 14,951 49.00 % 7,326 — — — 7,326 Suwon New Power Co., Ltd. 1,966 33.11 % 651 — 267 136 1,054 KPGE Inc. 989 29.00 % 287 — — — 287 Gwangbaek Solar Power Investment Co., Ltd. 9,925 44.00 % 4,367 315 — — 4,682 Go deok Clean Energy Co., Ltd. 1,574 61.00 % 960 — — — 960 SureDataLab Co., Ltd. 353 23.95 % 85 — — — 85 SEP Co., Ltd. 64 21.26 % 14 — — — 14 Hankook Electric Power Information Co., Ltd. 550 25.25 % 139 — — — 139 Tronix Co., Ltd. 593 20.00 % 119 — — — 119 O2&B Global Co., Ltd. 108 20.00 % 22 — — — 22 Muan Sunshine Solar Power Plant Co., Ltd. 3,010 20.00 % 602 494 — — 1,096 Bigeum Resident Photovoltaic Power Co., Ltd. (387 ) 29.90 % (116 ) — — 116 — Jeju SolarOne Co., Ltd. 1,594 10.00 % 159 — — — 159 Goesan Solar Park Co., Ltd. 5,808 29.00 % 1,684 — — — 1,684 Saemangeum Heemang Photovoltaic Co., Ltd. 29,377 35.00 % 10,282 740 — — 11,022 Bitgoel Eco Energy Co., Ltd. 100 29.00 % 29 — — — 29 Jeju Gimnyeong Wind Power Co., Ltd. 5,260 30.00 % 1,578 — — — 1,578 Seoroseoro Sunny Power Plant Co., Ltd. 1,182 19.46 % 230 — — — 230 Muan Solar Park Co., Ltd. 20,374 19.00 % 3,871 309 — — 4,180 YuDang Solar Co., Ltd. 2,484 20.00 % 497 — — (137 ) 360 Anjwa Smart Farm & Solar City Co., Ltd. 24,174 19.50 % 4,714 796 — — 5,510 Daewon Green Energy Co., Ltd. 15,248 25.36 % 3,866 44 — — 3,910 <Joint ventures> KEPCO-Uhde Inc. 197 50.80 % 100 — — — 100 Shuweihat Asia Power Investment B.V. 27,069 49.00 % 13,264 — — — 13,264 Shuweihat Asia Operation & Maintenance Company 1,922 55.00 % 1,057 — — — 1,057 Waterbury Lake Uranium L.P. 59,808 33.10 % 19,797 — — — 19,797 ASM-BG 36,400 50.00 % 18,200 — — — 18,200 RES Technology AD 31,860 50.00 % 15,930 — — — 15,930 KV Holdings, Inc. 6,013 40.00 % 2,405 — — — 2,405 KEPCO SPC Power Corporation 268,169 75.20 % 201,663 — — — 201,663 Gansu Datang Yumen Wind Power Co., Ltd. 16,325 40.00 % 6,530 — — — 6,530 Datang Chifeng Renewable Power Co., Ltd. 471,194 40.00 % 188,478 — — — 188,478 Datang KEPCO Chaoyang Renewable Power Co., Ltd. 106,324 40.00 % 42,530 — — — 42,530 Rabigh Electricity Company 396,179 40.00 % 158,472 — (60,511 ) (804 ) 97,157 Rabigh Operation & Maintenance Company Limited 9,533 40.00 % 3,813 — — — 3,813 Jamaica Public Service Company Limited 636,994 40.00 % 254,798 29,357 — (17,934 ) 266,221 KW Nuclear Components Co., Ltd. 25,217 45.00 % 11,348 — — (177 ) 11,171 Busan Shinho Solar Power Co., Ltd. 21,512 25.00 % 5,378 — — — 5,378 Global Trade Of Power System Co., Ltd. 1,884 29.00 % 546 — — — 546 Expressway Solar-light Power Generation Co., Ltd. 9,985 29.00 % 2,896 — — — 2,896 Amman Asia Electric Power Company 268,755 60.00 % 161,253 — — — 161,253 KAPES, Inc. 32,096 51.00 % 16,369 — (19,567 ) 3,198 — 2020 Investees Net assets Percentage Share in net Investment differential Intercompany transaction Others Book value In millions of won <Joint ventures> Honam Wind Power Co., Ltd. ￦ 13,292 29.00 % 3,855 32 — — 3,887 Jeongam Wind Power Co., Ltd. 11,550 40.00 % 4,620 — — — 4,620 Korea Power Engineering Service Co., Ltd. 18,488 29.00 % 5,362 — — — 5,362 Chun-cheon Energy Co., Ltd. 92,851 29.90 % 27,762 3 — (247 ) 27,518 Yeonggwangbaeksu Wind Power Co., Ltd. 20,791 15.00 % 3,119 5 — — 3,124 Nghi Son 2 Power LLC (266,560 ) 50.00 % (133,280 ) — — 133,280 — Kelar S.A. 106,063 65.00 % 68,941 2,508 — — 71,449 PT. Tanjung Power Indonesia 94,465 35.00 % 33,063 — — — 33,063 Incheon New Power Co., Ltd. 525 29.00 % 152 — — (152 ) — Seokmun Energy Co., Ltd. 51,082 29.00 % 14,814 — — — 14,814 Daehan Wind Power PSC (7,710 ) 50.00 % (3,855 ) — — 3,855 — Barakah One Company (230,516 ) 18.00 % (41,493 ) — (27,845 ) 69,338 — Nawah Energy Company 1,498 18.00 % 270 — — — 270 Momentum 1,696 33.33 % 565 — — — 565 Daegu Green Power Co., Ltd. 79,908 54.24 % 43,342 84 — (20,381 ) 23,045 Yeonggwang Wind Power Co., Ltd. 36,443 46.00 % 16,764 492 — — 17,256 Chester Solar IV SpA 2,242 45.00 % 1,009 55 — — 1,064 Chester Solar V SpA 361 45.00 % 162 115 — — 277 Diego de Almagro Solar SpA 3,108 45.00 % 1,399 91 — — 1,490 South Jamaica Power Company Limited 159,494 20.00 % 31,899 — — (2 ) 31,897 Daesan Green Energy Co., Ltd. 64,435 35.00 % 22,552 — — — 22,552 RE Holiday Holdings LLC 137,618 50.00 % 68,809 — — — 68,809 RE Pioneer Holdings LLC 99,278 50.00 % 49,639 — — — 49,639 RE Barren Ridge 1 Holdings LLC 107,472 50.00 % 53,736 — — (49,270 ) 4,466 RE Astoria 2 LandCo LLC 10,459 50.00 % 5,230 — — — 5,230 RE Barren Ridge LandCo LLC 3,694 50.00 % 1,847 — — — 1,847 Laurel SpA 2,033 45.00 % 915 177 — — 1,092 KIAMCO KOWEPO Bannerton Hold Co Pty Ltd 33,312 12.37 % 4,121 8 — — 4,129 Chile Solar JV SpA 69,765 50.00 % 34,883 — — — 34,883 Taebaek Gadeoksan Wind Power Co., Ltd. 28,244 47.31 % 13,362 — — — 13,362 Cheong-Song Noraesan Wind Power Co., Ltd. 11,689 29.01 % 3,391 61 — 1 3,453 Chester Solar I SpA 3,082 45.00 % 1,387 234 — — 1,621 Solar Philippines Calatagan Corporation 50,849 38.00 % 19,323 29,694 — — 49,017 Saemangeum Solar Power Co., Ltd. 30,183 81.00 % 24,450 (158 ) — — 24,292 Chungsongmeon BongSan wind power Co., Ltd. 8,077 29.00 % 2,342 1,782 — — 4,124 Jaeun Resident Wind Power Plant Co., Ltd. 7,569 29.00 % 2,195 — — — 2,195 DE Energia SpA (6,607 ) 49.00 % (3,237 ) — — 11,424 8,187 Dangjin Eco Power Co., Ltd. 74,065 34.00 % 25,182 341 — — 25,523 Haemodum Solar Co., Ltd. 6,255 49.00 % 3,065 — — — 3,065 Yangyang Wind Power Co., Ltd. 20,884 50.00 % 10,442 43 — — 10,485 Horus Solar, S.A. De C.V. (1,242 ) 14.95 % (186 ) 3,580 — — 3,394 Recursos Solares PV De Mexico II, S.A. De C.V. 9,962 14.95 % 1,489 2,171 — — 3,660 Sunmex Renovables, S.A. De C.V. 1,577 14.95 % 236 4 — — 240 Stavro Holding II A.B. 46,385 20.00 % 9,277 — — — 9,277 Solaseado Solar Power Co., Ltd. 21,990 38.90 % 8,554 1,361 — — 9,915 Yeongam Solar Power Co., Ltd. 27,729 19.00 % 5,269 773 — — 6,042 Samsu Wind Power Co., Ltd. 13,720 19.00 % 2,607 — — — 2,607 Pulau Indah Power Plant Sdn. Bhd. 22,245 25.00 % 5,561 5,643 — — 11,204 Sam-Yang 11,296 49.00 % 5,535 — — — 5,535 NH-Amundi 73,534 29.53 % 21,715 — — 527 22,242 Shin-han 17,921 90.00 % 16,129 — — — 16,129 2020 Investees Net assets Percentage Share in net Investment differential Intercompany transaction Others Book value In millions of won PT Barito Wahana Tenaga ￦ 205,894 30.61 % 63,029 — — — 63,029 Cheongna Energy Co., Ltd. 5,742 50.10 % 2,877 3,137 (1,074 ) — 4,940 Naepo Green Energy Co., Ltd. (7,802 ) 29.20 % (2,278 ) — — 2,278 — Dayone Energy Co., Ltd. (54,480 ) 46.30 % (25,224 ) — (923 ) 26,147 — OneEnergy Asia Limited 77,855 40.00 % 31,142 25,512 — — 56,654 KAS Investment I LLC 78,410 29.89 % 23,437 — — — 23,437 KAS Investment II LLC 78,096 29.89 % 23,343 — — — 23,343 Energyco LLC 2,862 29.00 % 830 829 — — 1,659 CAES, LLC 40,840 36.00 % 14,702 2,924 — — 17,626 Hapcheon Floating Photovoltaic Power Plant Inc. 9,708 19.47 % 1,890 — — — 1,890 Busan Industrial Solar Power Co., Ltd. 784 28.02 % 220 290 — — 510 Bitsolar Energy Co., Ltd. (4,803 ) 27.10 % (1,302 ) 1,654 — — 352 (*) The percentage of ownership shown above is after considering the treasury stocks and others. 2021 Investees Net assets Percentage Share in net 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 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 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. (formerly, Korea Nuclear Partners 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 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 1,265 20.00 % 253 53 — — 306 2021 Investees Net assets Percentage Share in net 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 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 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 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 2,509 55.00 % 1,380 — — — 1,380 Waterbury Lake Uranium L.P. 65,226 33.10 % 21,590 — — — 21,590 ASM-BG 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 2021 Investees Net assets Percentage Share in net Investment differential Intercompany transaction Others Book value In millions of won <Joint ventures> 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 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 2021 Investees Net assets Percentage Share in net Investment differential Intercompany transaction Others Book value In millions of won <Joint ventures> 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 10,190 49.00 % 4,993 — — — 4,993 NH-Amundi 70,872 29.53 % 20,929 527 — — 21,456 Shin-han 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. (formerly, Energyco LLC) 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 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.
Summary of Unrecognized Equity Interest in Investments in Associates and Joint Ventures	(6) As of December 31, 2020, and 2021, 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: 2020 2021 Unrecognized Accumulated unrecognized Unrecognized Accumulated unrecognized In millions of won Hadong Mineral Fiber Co., Ltd. ￦ — 2 — — Eurasia Energy Holdings (10 ) 175 15 190 Gunsan Bio Energy Co., Ltd. 290 3,582 282 3,864 Daehan Wind Power PSC 3,855 3,855 (3,855 ) — Dayone Energy Co., Ltd. (14,035 ) 24,696 (1,244 ) 23,452 Nghi Son 2 Power LLC 30,456 133,280 (114,340 ) 18,940 Samcheok Eco Materials Co., Ltd. (3 ) 785 (323 ) 462 Naepo Green Energy Co., Ltd. (7,003 ) 2,278 5,469 7,747 Barakah One Company (46,758 ) 69,338 (26,502 ) 42,836 Pioneer Gas Power Limited 15,824 15,938 21,691 37,629 Incheon New Power Co., Ltd. 194 194 (31 ) 163 Bigeum Resident Photovoltaic Power Co., Ltd. 116 116 182 298 KAPES, Inc. 3,198 3,198 317 3,515 Chester Solar IV SpA — — 21 21
Summary of Shareholders' Agreements on Investments in Associates and Joint Ventures	(7) As of December 31, 2021, 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 Company 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. 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) Samcheok Eco Materials Co., Ltd. For Samcheok Eco Materials Co., Ltd., ordinary shareholders have the right to buy the shares of preferred shareholders if preferred shareholders intend to sell their preferred stock until December 26, 2023, and ordinary shareholders shall guarantee the investment principle of preferred shareholders. (xiii) Hyundai Green Power Co., Ltd. As of December 31, 2021, the Company has call option against the financial investors (Korea Development Bank 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. (xiv) 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. (xv) 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. (xvi) Changjuk Wind Power Co., Ltd. In the case where non-controlling (xvii) 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.
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, 2021 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. KPGE Inc. 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. 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 collateralized debt is fully repaid. Company Nature and extent of any significant restrictions 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 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.

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2021
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, 2020 and 2021 are as follows: 2020 Acquisition cost Government grants Accumulated depreciation Accumulated losses Book value In millions of won Land ￦ 13,970,098 (23,475 ) — (26,772 ) 13,919,851 Buildings 21,773,824 (57,231 ) (9,150,218 ) (7,074 ) 12,559,301 Structures 74,136,523 (180,009 ) (27,864,461 ) (13,207 ) 46,078,846 Machinery 94,295,027 (157,785 ) (43,740,838 ) (515,402 ) 49,881,002 Ships 2,482 — (2,227 ) — 255 Vehicles 338,386 (632 ) (259,288 ) (115 ) 78,351 Equipment 1,895,528 (227 ) (1,487,643 ) (42 ) 407,616 Tools 1,195,721 (239 ) (1,003,295 ) (39 ) 192,148 Construction-in-progress 31,121,255 (79,126 ) — (157,530 ) 30,884,599 Right-of-use 7,905,214 — (3,363,048 ) — 4,542,166 Asset retirement costs 12,260,732 — (4,701,138 ) (146,423 ) 7,413,171 Others 13,979,980 — (11,227,899 ) — 2,752,081 ￦ 272,874,770 (498,724 ) (102,800,055 ) (866,604 ) 168,709,387 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 22,973,395 (52,122 ) (10,041,270 ) (7,073 ) 12,872,930 Structures 78,473,094 (172,021 ) (30,171,363 ) (13,205 ) 48,116,505 Machinery 101,049,793 (140,082 ) (48,791,577 ) (514,991 ) 51,603,143 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 ￦ 287,613,240 (501,409 ) (113,125,144 ) (866,906 ) 173,119,781
Summary of Changes in Property, Plant and Equipment	(2) Changes in property, plant and equipment for the years ended December 31, 2021 and 2020 are as follows: 2020 Beginning Acquisition Disposal Depreciation Impairment Others Ending balance In millions of won Land ￦ 13,848,063 5,330 (31,304 ) (273 ) — 121,510 13,943,326 (Government grants) (21,817 ) — 2 — — (1,660 ) (23,475 ) Buildings 12,445,706 7,225 (16,015 ) (875,680 ) (2,107 ) 1,057,403 12,616,532 (Government grants) (61,920 ) — — 5,206 — (517 ) (57,231 ) Structures 45,178,870 36,091 (346,612 ) (2,313,920 ) (3,571 ) 3,707,997 46,258,855 (Government grants) (186,554 ) — 2,032 9,526 — (5,013 ) (180,009 ) Machinery 49,907,300 407,521 (283,845 ) (5,526,816 ) (74,362 ) 5,608,989 50,038,787 (Government grants) (158,907 ) — 496 17,468 — (16,842 ) (157,785 ) Ships 201 — — (106 ) — 160 255 Vehicles 70,585 3,880 (151 ) (35,036 ) — 39,705 78,983 (Government grants) (2,275 ) — 4 2,064 — (425 ) (632 ) Equipment 374,115 72,655 (86 ) (186,004 ) — 147,163 407,843 (Government grants) (241 ) — — 149 — (135 ) (227 ) Tools 164,064 28,048 (193 ) (82,862 ) — 83,330 192,387 (Government grants) (403 ) — — 243 — (79 ) (239 ) Construction-in-progress 28,419,470 12,726,469 (486 ) — 7,799 (10,189,527 ) 30,963,725 (Government grants) (61,211 ) 8,783 — — — (26,698 ) (79,126 ) Right-of-use 4,783,573 291,334 (827 ) (586,254 ) — 54,340 4,542,166 Asset retirement costs 7,374,527 131 (196 ) (819,708 ) — 858,417 7,413,171 Others 2,628,681 6,470 (8,145 ) (984,097 ) (366 ) 1,109,538 2,752,081 ￦ 164,701,827 13,593,937 (685,326 ) (11,376,100 ) (72,607 ) 2,547,656 168,709,387 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 ) — 1,208,997 12,925,052 (Government grants) (57,231 ) — — 5,174 — (65 ) (52,122 ) Structures 46,258,855 (5,472 ) (319,287 ) (2,582,488 ) (741 ) 4,937,659 48,288,526 (Government grants) (180,009 ) — 1,811 9,517 — (3,340 ) (172,021 ) Machinery 50,038,787 268,126 (135,803 ) (5,759,155 ) — 7,331,270 51,743,225 (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 30,963,725 12,165,238 (66,965 ) — (3,315 ) (12,902,589 ) 30,156,094 (Government grants) (79,126 ) 5,027 — — — (37,723 ) (111,822 ) Right-of-use 4,542,166 78,213 (11,787 ) (554,615 ) — 5,420 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 ￦ 168,709,387 12,614,177 (613,515 ) (11,770,725 ) (4,056 ) 4,184,513 173,119,781

Investment Properties (Tables)

Investment Properties (Tables)	12 Months Ended
	Dec. 31, 2021
Disclosure of detailed information about investment property [abstract]
Summary of Investment Properties	Investment properties as of December 31, 2020 and 2021 are as follows: 2020 Acquisition Government Accumulated Book value In millions of won Land ￦ 200,391 — — 200,391 Buildings 59,347 (29 ) (34,514 ) 24,804 ￦ 259,738 (29 ) (34,514 ) 225,195 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
Summary of Changes in Investment Properties	Changes in investment properties for the years ended December 31, 2020 and 2021 are as follows: 2020 Beginning Depreciation Others Ending In millions of won Land ￦ 129,897 — 70,494 200,391 Buildings 28,696 (1,454 ) (2,409 ) 24,833 (Government grants) (13 ) 1 (17 ) (29 ) ￦ 158,580 (1,453 ) 68,068 225,195 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
Summary of Income and Expenses Related to Investment Properties	Income and expenses related to investment properties for the years ended December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Rental income ￦ 8,335 10,118 Operating and maintenance expenses related to rental income (1,453 ) (1,386 ) ￦ 6,882 8,732
Summary of Fair Value of Investment Properties	Fair value of investment properties as of December 31, 2020 and 2021 are as follows: 2020 2021 Book value Fair value Book value Fair value In millions of won Land ￦ 200,391 300,001 201,605 268,702 Buildings 24,804 44,597 11,179 13,636 ￦ 225,195 344,598 212,784 282,338

Construction Services Contrac_2

Construction Services Contracts (Tables)	12 Months Ended
	Dec. 31, 2021
Construction Services 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, 2019, 2020 and 2021 are as follows: 2019 Beginning balance Increase Recognized as revenue Ending In millions of won Nuclear power plant construction in UAE and others ￦ 3,620,788 379,269 (1,264,916 ) 2,735,141 (*) For the year ended December 31, 2019, the increased balance of contracts from new orders is ￦390,224 million and the decreased balance of contracts due to changes in scope of construction work and foreign exchange impact is ￦10,955 million. 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.
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, 2020 and 2021 are as follows: 2020 Accumulated earned revenue Accumulated expense Accumulated profit Unearned advance receipts In millions of won Nuclear power plant construction in UAE and others ￦ 21,460,431 20,242,735 1,217,696 97,348 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
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, 2020 and 2021 are as follows: 2020 2021 Contract Contract Contract Contract In millions of won Nuclear power plant construction in UAE and others ￦ 79,662 88,126 82,306 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 ￦39,063 million and ￦57,639 million, as of December 31, 2020 and 2021, respectively. (*2) Included in non-financial Revenue recognized for the year ended December 31, 2021 from performance obligations satisfied in previous periods is (-) ￦6,480 million.

Intangible Assets other than _2

Intangible Assets other than Goodwill (Tables)	12 Months Ended
	Dec. 31, 2021
Disclosure of detailed information about intangible assets [abstract]
Summary of Intangible Asset Explanatory	(1) Intangible assets as of December 31, 2020 and 2021 are as follows: 2020 Acquisition Government Accumulated Accumulated Book value In millions of won Software ￦ 775,667 (136 ) (623,504 ) — 152,027 Licenses and franchises 547 — (547 ) — — Copyrights, patents rights and other industrial rights 101,866 — (49,772 ) (9,178 ) 42,916 Mining rights 604,703 — (34,062 ) (528,251 ) 42,390 Development expenditures 958,035 (5,043 ) (862,850 ) (19 ) 90,123 Intangible assets under development 79,862 (7,203 ) — (12,844 ) 59,815 Usage rights of donated assets and other 592,930 — (408,455 ) — 184,475 Leasehold rights 27,843 — (21,503 ) — 6,340 Greenhouse gas emissions rights 61,373 — — — 61,373 Others 566,200 (75 ) (137,843 ) (12,011 ) 416,271 ￦ 3,769,026 (12,457 ) (2,138,536 ) (562,303 ) 1,055,730 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
Summary of Changes in Intangible Assets	(2) Changes in intangible assets for the years ended December 31, 2020 and 2021 are as follows: 2020 Beginning Acquisition Disposal Amortization Impairment Others Ending In millions of won Software ￦ 164,995 14,101 — (77,501 ) — 50,568 152,163 (Government grants) (235 ) — — 99 — — (136 ) Copyrights, patents rights and other industrial rights 53,261 369 (390 ) (8,352 ) — (1,972 ) 42,916 Mining rights 43,723 1,664 — (4,380 ) — 1,383 42,390 Development expenditures 93,843 10,273 — (32,034 ) — 23,084 95,166 (Government grants) (1,492 ) — — 1,453 — (5,004 ) (5,043 ) Intangible assets under development 60,490 53,638 — — (23 ) (47,087 ) 67,018 (Government grants) (11,029 ) — — — — 3,826 (7,203 ) Usage rights of donated assets and other 193,161 — — (18,448 ) — 9,762 184,475 Leasehold rights 5,318 — — (831 ) — 1,853 6,340 Greenhouse gas emissions rights 41,656 37,109 (9,271 ) — — (8,121 ) 61,373 Others 426,364 3,217 (46 ) (30,476 ) (3,576 ) 20,863 416,346 (Government grants) (79 ) — — 4 — — (75 ) ￦ 1,069,976 120,371 (9,707 ) (170,466 ) (3,599 ) 49,155 1,055,730 2021 Beginning Acquisition Disposal Amortization Impairment 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
Summary of Significant Specific Intangible Assets	(3) Significant specific intangible assets as of December 31, 2020 and 2021 are as follows: 2020 Type Description Currency Amount Remaining useful lives In millions of won and thousands of Australian dollars Software ERP system and others KRW 81 2 months ~ 4 months Copyrights, patents rights and other industrial rights Smart technology verification and standard design project conducting right KRW 4,936 1 year and 9 months Contributions to ARP NRC DC KRW 29,219 7 years Mining rights Mining rights of Bylong mine AUD — — (*) Development expenditures Electricity sales information system KRW 8,229 1 year and 2 months Usage rights of donated assets and others Sejong Haengbogdosi sharing charge KRW 26,847 5 years and 11 months Dangjin power plant load facility usage right KRW 1,574 3 months Right of use electricity and gas supply facility (Community district of Songdo) KRW 10,016 9 years and 6 months Others Occupancy and use of public waters KRW 87,035 16 years and 1 month Greenhouse gas emissions rights KRW 61,373 — Business rights KRW 166,207 28 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. 2021 Type Description Currency Amount Remaining useful lives In millions of won and thousands of Australian dollars Software DAS MS-SQL CORE license 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 ARP NRC DC 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.
Summary of Recognized Research and Development Expenses	For the years ended December 31, 2019, 2020 and 2021, the Company recognized research and development expenses of 735,715 million, 700,642 million and 689,397 million, respectively.

Trade and Other Payables (Table

Trade and Other Payables (Tables)	12 Months Ended
	Dec. 31, 2021
Trade and other payables [abstract]
Summary of Trade and Other Payables Explanatory	Trade and other payables as of December 31, 2020 and 2021 are as follows: 2020 2021 Current Non-current Current Non-current In millions of won Trade payables ￦ 2,606,861 — 4,780,260 — Non-trade payables 1,785,068 2,324,965 1,536,976 2,032,260 Accrued expenses 1,197,815 2,038 1,174,765 8,095 Leasehold deposits received 2,336 943 1,699 741 Other deposits received 83,505 67,645 72,063 68,050 Lease liabilities 576,665 4,044,431 583,558 3,826,945 Dividends payable 4,271 — 4,105 — Others(*) — 40,390 — 60,407 ￦ 6,256,521 6,480,412 8,153,426 5,996,498 (*) Details of others as of December 31, 2020 and 2021 are as follows: 2020 2021 Current Non-current Current Non-current In millions of won Advance received from local governments ￦ — 4,278 — 3,477 Others — 36,112 — 56,930 ￦ — 40,390 — 60,407

Borrowings and Debt Securities

Borrowings and Debt Securities (Tables)	12 Months Ended
	Dec. 31, 2021
Disclosure of detailed information about borrowings [abstract]
Disclosure of detailed information about borrowings [text block]	(1) Borrowings and debt securities as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Current liabilities Short-term borrowings ￦ 1,436,922 2,920,563 Current portion of long-term borrowings 677,982 1,463,703 Current portion of debt securities 8,565,301 9,652,986 Less : Current portion of discount on long-term borrowings (1,723 ) (2,048 ) Less : Current portion of discount on debt securities (3,677 ) (5,370 ) 10,674,805 14,029,834 Non-current liabilities Long-term borrowings 3,018,898 2,278,481 Debt securities 56,188,234 64,385,784 Less : Discount on long-term borrowings (14,899 ) (12,857 ) Less : Discount on debt securities (143,823 ) (152,760 ) Add: Premium on debt securities 1,366 1,031 59,049,776 66,499,679 ￦ 69,724,581 80,529,513
Repayment Schedule of Borrowings and Debt Securities	(2) Repayment schedule of borrowings and debt securities as of December 31, 2020 and 2021 are as follows: 2020 Borrowings Debt Securities In millions of won Less than 1 year ￦ 2,114,904 8,565,301 1~ 5 years 1,564,252 28,746,117 Over 5 years 1,454,646 27,442,117 ￦ 5,133,802 64,753,535 2021 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
Short-term Borrowings	(3) Short-term borrowings as of December 31, 2020 and 2021 are as follows: 2020 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 0.80 ~ 4.60 2021.01.05 ~2021.12.31 — ￦ 580,004 Electronic short-term bonds KB Securities and others 0.75 ~ 1.35 2021.01.13 ~2021.03.18 — 470,000 Foreign short-term borrowings Shinhan Bank 0.71 ~ 0.74 2021.01.04 ~2021.03.31 USD 55,393 60,268 Foreign short-term borrowings(*) Korea Development Bank and others 1M Libor + 1.25 2022.04.29 USD 73,704 81,290 Local bank overdraft Woori Bank Standard 2021.02.26 — 29,960 Local bank overdraft Korea Development Bank and others 1.42 ~ 1.88 2021.01.07~ 2021.04.26 — 215,400 ￦ 1,436,922 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 ~ — ￦ 2,030,886 Electronic short-term bonds BNK Securities and others 1.35~1.77 2022.01.21 ~ — 100,000 Foreign short-term borrowings Shinhan Bank and others 0.34~0.45 2022.01.04 ~ 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 ~ 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 ~ — 208,018 ￦ 2,920,563 (*) The contractual maturity is 2022 but is classified as short-term borrowing due to intention of early redemption in 3 months after borrowing.
Long-term Borrowings	(4) Long-term borrowings as of December 31, 2020 and 2021 are as follows: 2020 Type Interest rate (%) Maturity Foreign currency Local In millions of won and thousands of foreign currencies Local long-term borrowings Korea Development Bank Others 0.50 2021~2044 — ￦ 2,946 Facility 2.50~4.60 2021~2028 — 50,293 Operating funds 2.33 2022 — 20,000 Operating funds 1yr KoFC bond rate +0.81~0.95 2022~2023 — 24,300 Hana Bank Commercial Paper 3M CD+0.13~0.32 2021~2024 — 1,150,000 Facility 4.60 2028 — 11,088 Facility 3yr KTB rate-1.25 Standard overdraft rate+1.50~2.45 2021~2035 — 43,419 IBK PF Refinancing CD+1.25 2030 — 9,543 Export-Import Bank of Korea Project loans 1.50 2026 — 16,204 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 — 2,509 Facility 3yr KTB rate-2.25 2021~2024 — 1,527 Project loans — 2023 — 1,197 Others KTB rate-2.25 2024~2028 — 14,045 Shinhan Bank Facility CB rate+1.10 2028 — 16,632 Others 3.95 2034 — 89,257 Others Standard overdraft rate+1.00 2034 — 89,257 Kookmin Bank Facility MOR+0.79 3M CD+1.79 2021~2031 — 46,512 Others Facility 1.75~6.80 2026~2037 — 510,262 Facility CB rate+1.10~1.20 3M CD+1.60 Standard overdraft rate+1.50~2.45 2023~2037 — 89,506 PF Refinancing 4.10 2030 — 26,509 Others 3.90~7.90 2023~2039 — 222,356 2,485,062 Foreign long-term borrowings Korea Energy Agency Project loans — 2021~2023 USD 8,744 9,513 Export-Import Bank of Korea and others Direct loan and others 1M Libor+1.80~3.20 2036 USD 96,014 104,463 Direct loan and others 3M LIBOR+2.75~3.70 2027 JOD 132,228 202,912 PF Loan 6M LIBOR+1.70~2.50 2032 USD 111,225 121,013 Others 3.88 2021 USD 289,509 314,986 POSCO and others Shareholder’s loan 8.00 2023 USD 14,061 15,298 Shareholder’s loan 8.00 2031 JOD 4,853 7,447 Samsung Life Insurance and others Syndicated Loans 3.10 2032 JPY 4,682,816 49,369 Woori Bank and others Syndicated Loans JPY 6M Libor+2.00 2032 JPY 3,020,746 31,847 IFC and others Others 6M Libor+5.00 2031 USD 224,115 243,837 Federal Financing Bank and others PF Loans 2.39~6.00 2031~2038 USD 97,347 105,913 Others Others — — USD 4,798 5,220 1,211,818 3,696,880 Less: Discount on long-term borrowings (16,622 ) Less: Current portion of long-term borrowings (677,982 ) Add: Current portion of discount on long-term borrowings 1,723 ￦ 3,003,999 2021 Type Interest rate (%) Maturity Foreign currency Local 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 KoFC 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 Loans 3.10~8.00 2032 JPY 5,144,387 53,000 Woori Bank and others Syndicated Loans 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 Loans 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
Local Debt Securities	(5) Local debt securities as of December 31, 2020 and 2021 are as follows: Issue date Maturity Interest 2020 2021 In millions of won Electricity Bonds 2012.01.15~ 2021.12.23 2022.01.05~ 2049.10.24 1.02~4.20 ￦ 27,810,000 34,080,000 Corporate Bonds(*) 2009.10.16~ 2021.11.22 2022.01.19~ 2051.11.22 0.86~6.00 26,463,577 28,194,472 54,273,577 62,274,472 Less: Discount on local debt securities (46,730 ) (52,723 ) Less: Current portion of local debt securities (7,243,217 ) (7,432,647 ) Add: Current portion of discount on local debt securities 2,108 2,510 ￦ 46,985,738 54,791,612 (*) Among the corporate bonds, each holder of Hee Mang Sunlight rights bonds
Foreign Debt Securities	(6) Foreign debt securities as of December 31, 2020 and 2021 are as follows: 2020 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 ￦ 303,227 FY-97 1997.01.31~ 1997.08.04 2027.02.01~ 2027.08.01 6.75~7.00 USD 314,717 342,412 FY-04 2004.04.23 2034.04.23 5.13 USD 286,920 312,169 FY-11 2011.07.13 2021.07.13 4.75 USD 500,000 544,000 FY-12 2012.09.19 2022.09.19 3.00 USD 750,000 816,000 FY-14 2014.07.30 2029.07.30 3.57 USD 100,000 108,800 FY-15 2015.06.15 2025.06.15 3.25 USD 300,000 326,400 FY-16 2016.01.21 2021.07.21 2.50 USD 300,000 326,400 FY-17 2017.06.19~ 2017.07.25 2022.06.19~ 2027.07.25 2.63~3.13 USD 800,000 870,400 FY-17 2017.10.30 2037.10.30 1.70 EUR 40,000 53,530 FY-17 2017.11.16 2037.11.16 2.36 SEK 450,000 59,747 FY-18 2018.01.29~ 2018.07.25 2021.01.29~ 2023.07.25 3.00~3.88 USD 1,800,000 1,958,400 FY-18 2018.03.13 2028.03.13 3.35 HKD 1,650,000 231,578 FY-19 2019.01.22~ 2019.06.24 2022.01.22~ 2024.06.24 2.50~3.38 USD 800,000 870,400 FY-19 2019.02.27 2024.02.27 0.13 CHF 200,000 246,866 FY-19 2019.07.19 2024.07.19~ 2027.07.19 0.00~0.05 CHF 300,000 370,299 FY-19 2019.07.22 2022.07.22 2.38 USD 300,000 326,400 FY-19 2019.10.30 2024.10.30 3M BBSW+0.97 AUD 300,000 250,968 FY-19 2019.12.19 2037.12.31 3.30~5.70 USD 387,098 421,163 FY-20 2020.02.03 2025.02.03 2.13 USD 300,000 326,400 FY-20 2020.06.15 2025.06.15 1.13 USD 500,000 544,000 FY-20 2020.05.06 2025.05.06 1.75 USD 500,000 544,000 FY-20 2020.08.03 2026.02.03 0.61 USD 300,000 326,399 10,479,958 Less : Discount on foreign debt securities (100,770 ) Add : Premium on foreign debt securities 1,366 Less : Current portion of foreign debt securities (1,322,084 ) Add : Current portion of discount on foreign debt securities 1,569 ￦ 9,060,039 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~ 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
Changes in Borrowings and Debt Securities	(7) Changes in borrowings and debt securities for the years ended December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Beginning balance ￦ 67,876,541 69,724,581 Cash flow 2,538,787 9,653,394 Effect of exchange rate fluctuations (640,304 ) 1,001,493 Others (50,443 ) 150,045 Ending balance ￦ 69,724,581 80,529,513

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2021
Presentation of leases for lessee [abstract]
Summary of Right-of-Use Assets	(2) Right-of-use assets as of December 31, 2020 and 2021 are as follows: 2020 Acquisition cost Accumulated depreciation Book value In millions of won Land ￦ 811,014 (104,435 ) 706,579 Buildings 82,749 (35,527 ) 47,222 Structures 24,175 (3,689 ) 20,486 Machinery 1,308 (613 ) 695 Ships 4,280,331 (842,968 ) 3,437,363 Vehicles 29,281 (15,756 ) 13,525 Others(*) 2,676,356 (2,360,060 ) 316,296 ￦ 7,905,214 (3,363,048 ) 4,542,166 (*) Including power purchase agreements (“PPA”) with GS EPS and another LNG combined power supplier. 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.
Summary of Changes in Right-of-Use Assets	(3) Changes in right-of-use assets for the years ended December 31, 2020 and 2021 are as follows: 2020 Beginning Increase Depreciation Decrease Others Ending In millions of won Land ￦ 644,074 12,269 (52,069 ) — 102,305 706,579 Buildings 34,577 53,182 (37,609 ) (803 ) (2,125 ) 47,222 Structures 25,644 260 (1,485 ) — (3,933 ) 20,486 Machinery 824 — (129 ) — — 695 Ships 3,688,289 183,789 (427,221 ) — (7,494 ) 3,437,363 Vehicles 13,708 9,009 (7,747 ) (21 ) (1,424 ) 13,525 Others 376,457 32,825 (59,994 ) (3 ) (32,989 ) 316,296 ￦ 4,783,573 291,334 (586,254 ) (827 ) 54,340 4,542,166 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 (50,485 ) (10,311 ) (3,422 ) 279,168 ￦ 4,542,166 78,213 (554,615 ) (11,787 ) 5,420 4,059,397
Summary of Lease liabilities	(4) Lease liabilities as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Less than 1 year ￦ 614,442 620,121 1 ~ 5 years 2,133,538 2,158,145 More than 5 years 2,461,557 2,150,722 5,209,537 4,928,988 Less : Discount (588,441 ) (518,485 ) Present value of lease payment ￦ 4,621,096 4,410,503
Summary of Liquidity Classification of Lease Liabilities	(5) The details of the liquidity classification of lease liabilities as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Current lease liabilities ￦ 576,665 583,558 Non-current lease liabilities 4,044,431 3,826,945 ￦ 4,621,096 4,410,503
Summary of Changes in lease liabilities	(6) Changes in lease liabilities for the years ended December 31, 2020 and 2021 are as follows: 2020 Beginning Increase Decrease Interest Others(*) Ending In millions of won Lease liabilities ￦ 5,070,133 280,114 (725,759 ) 111,782 (115,174 ) 4,621,096 (*) Including translation effect of foreign currency lease liabilities and others. 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 (*) 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 2020 2021 In millions of won Depreciation of right-of-use assets ￦ 586,254 554,615 Interest expenses of lease liabilities 111,782 93,651 Leases expenses for short-term leases 45,787 199,490 Leases expenses for leases of low-value assets 2,796 2,349 Variable lease payments 33,267 54,675 ￦ 779,886 904,780
Summary of Profit and Loss Related To Finance Lease	(2) Profit and loss related to finance lease for the years ended December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Finance income on the net investment in the lease ￦ 117,763 111,569
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, 2020 and 2021 are as follows: 2020 2021 In millions of won Less than 1 year ￦ 162,211 172,528 1 ~ 2 years 148,485 163,937 2 ~ 3 years 144,913 158,933 3 ~ 4 years 139,605 156,450 4 ~ 5 years 136,962 155,068 More than 5 years 1,583,576 1,588,403 2,315,752 2,395,319 Less : Unearned finance income (1,192,686 ) (1,194,627 ) Net investment in the lease(*) ￦ 1,123,066 1,200,692 (*) Including the present value of unguaranteed residual value amounting to ￦16,407 million and ￦19,574 million, as of December 31, 2020 and 2021, 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, 2020 and 2021 are as follows: 2020 2021 In millions of won Beginning balance ￦ 862 990 Bad debt expense 128 — Reversal of allowance for doubtful accounts — (222 ) Ending balance ￦ 990 768

Employment Benefits (Tables)

Employment Benefits (Tables)	12 Months Ended
	Dec. 31, 2021
Disclosure of information about defined benefit plans [abstract]
Summary of Employment Benefits	(1) Employment benefit obligations as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Net defined benefit asset ￦ 7,231 20,871 Net defined benefit obligations 1,907,013 1,675,741 Other long-term employee benefit obligations 3,847 3,417
Summary of Principal Assumptions on Actuarial Valuation	(2) Principal assumptions used for 2020 2021 Discount rate 1.87%~2.12% 2.51% ~ 2.60% Future salary and benefit levels 4.28% 4.28% Weighted average duration 10.77 years 10.39 years
Summary of Expense Relating to defined Benefit Plans	(3) Details of expense relating to defined benefit plans for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Current service cost ￦ 440,300 509,520 524,942 Interest cost 83,619 83,248 91,877 Expected return on plan assets (41,597 ) (42,742 ) (52,782 ) Past service cost 301,442 (2,027 ) 5,483 Loss from settlement (2,017 ) — — ￦ 781,747 547,999 569,520 Expenses described above are recognized in those items below in the consolidated financial statements. 2019 2020 2021 In millions of won Cost of sales ￦ 580,623 397,442 415,959 Selling and administrative expenses 120,455 94,846 95,983 Others (Construction-in-progress and others) 80,669 55,711 57,578 ￦ 781,747 547,999 569,520
Summary of Defined Benefits	(4) Details of defined benefit obligations as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Present value of defined benefit obligation from funded plans ￦ 4,570,614 4,564,417 Fair value of plan assets (2,670,832 ) (2,909,547 ) Net liabilities incurred from defined benefit plans ￦ 1,899,782 1,654,870
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, 2020 and 2021 are as follows: 2020 2021 In millions of won Beginning balance ￦ 4,035,400 4,570,614 Current service cost 509,520 524,942 Interest cost 83,248 91,877 Remeasurement component 84,385 (345,755 ) Past service cost (2,027 ) 5,483 Actual payments (139,956 ) (282,794 ) Others 44 50 Ending balance ￦ 4,570,614 4,564,417
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, 2020 and 2021 are as follows: 2020 2021 In millions of won Beginning balance ￦ 2,111,313 2,670,832 Expected return 42,742 52,782 Remeasurement component (390 ) (8,457 ) Contributions by the employers 582,275 317,707 Actual payments (65,108 ) (123,317 ) Ending balance ￦ 2,670,832 2,909,547
Summary of the Fair Value of Plan Assets	(7) Details of the fair value of plan assets as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Equity instruments ￦ 253,358 344,002 Debt instruments 822,582 744,167 Bank deposits 284,655 407,809 Others 1,310,237 1,413,569 ￦ 2,670,832 2,909,547
Summary of Remeasurement Components Recognized in Other Comprehensive Income (loss)	(8) Remeasurement components 2020 2021 In millions of won Actuarial gain from changes in financial assumptions ￦ (2,979 ) (258,194 ) Experience adjustments, etc. 87,364 (87,561 ) Expected return 390 8,457 ￦ 84,775 (337,298 )

Provisions (Tables)

Provisions (Tables)	12 Months Ended
	Dec. 31, 2021
Disclosure of other provisions [abstract]
Provisions	Provisions as of December 31, 2020 and 2021 are as follows: 2020 2021 Current Non-current Current Non-current In millions of won Employment benefits Provisions for employment benefits ￦ 1,024,574 — 1,048,939 — Litigation Litigation provisions 46,287 66,715 26,269 88,449 Decommissioning cost Nuclear plants — 16,974,884 — 19,461,461 Spent fuel 487,529 866,472 457,466 893,196 Radioactive waste 46,369 1,845,244 137,342 1,695,193 PCBs — 119,019 — 103,665 Other recovery provisions — 25,840 — 30,231 Others Power plant regional support program 144,272 — 146,588 — Transmission regional support program 96,895 — 250,288 — Provisions for financial guarantee 22,250 44,104 21,032 59,809 Provisions for RPS 9,126 — — — Provisions for greenhouse gas emissions obligations 393,121 — 655,544 — Others 181,241 133,294 102,408 169,420 ￦ 2,451,664 20,075,572 2,845,876 22,501,424
Changes in provisions	Changes in provisions for the years ended December 31, 2020 and 2021 are as follows: 2020 Beginning Increase in Payment Reversal Others Ending balance In millions of won Employment benefits Provisions for employment benefits ￦ 975,619 1,078,382 (1,028,218 ) — (1,209 ) 1,024,574 Litigation Litigation provisions 88,398 81,990 (34,662 ) (22,724 ) — 113,002 Decommissioning cost Nuclear plants 15,994,039 1,028,580 (47,735 ) — — 16,974,884 Spent fuel 1,355,280 394,642 (395,921 ) — — 1,354,001 Radioactive waste 1,888,082 71,529 (67,998 ) — — 1,891,613 PCBs 152,981 3,017 (14,839 ) (22,140 ) — 119,019 Other recovery provisions 10,773 15,280 — — (213 ) 25,840 Others Power plant regional support program 140,133 39,445 (42,935 ) — 7,629 144,272 Transmission regional support program 139,785 151,796 (194,686 ) — — 96,895 Provisions for tax — — (24 ) 25 (1 ) — Provisions for financial guarantee 81,357 11,303 (20,962 ) (5,317 ) (27 ) 66,354 Provisions for RPS 2,889 494,199 (487,962 ) — — 9,126 Provisions for greenhouse gas emissions obligations 682,459 331,684 (633,482 ) 65,389 (52,929 ) 393,121 Others 158,974 210,051 (48,919 ) (4,593 ) (978 ) 314,535 ￦ 21,670,769 3,911,898 (3,018,343 ) 10,640 (47,728 ) 22,527,236 2021 Beginning Increase 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 program 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 emissions obligations 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
Summary of Greenhouse Gas Emissions Rights Allowances Received Free of Charge from the Government	Allowances received free of charge from the government for each planned period as of December 31, 2021 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 15,625 15,782 15,782 5,261 5,261 57,711
Summary of Changes in greenhouse gas emissions rights	Changes in greenhouse gas emissions rights for the years ended December 31, 2021 and 2020 are as follows: 2020 2nd planned period Quantity Amount In ten thousands of Beginning 17,276 18,306 Purchase (sell) 723 270,338 Government submission — — Borrowing (carryforward) (94 ) 68,711 Ending 17,905 357,355 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 of tons(tCO2-eq) and millions of won 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 (iii) The Company does not have greenhouse gas emissions rights pledged as collateral as of December 31, 2021. (iv) The Company does not hold any greenhouse gas emissions rights for a purpose of fluctuations (v) Estimated greenhouse

Government Grants (Tables)

Government Grants (Tables)	12 Months Ended
	Dec. 31, 2021
Government grants [Abstract]
Government Grants	(1) Government grants as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Land ￦ (23,475 ) (23,474 ) Buildings (57,231 ) (52,122 ) Structures (180,009 ) (172,021 ) Machinery (157,785 ) (140,082 ) Vehicles (632 ) (1,675 ) Equipment (227 ) (149 ) Tools (239 ) (64 ) Construction-in-progress (79,126 ) (111,822 ) Investment properties (29 ) (30 ) Software (136 ) (91 ) Development expenditures (5,043 ) (3,820 ) Intangible assets under development (7,203 ) (7,326 ) Other intangible assets (75 ) (71 ) ￦ (511,210 ) (512,747 )
Changes in government Grants	(2) Changes in government grants for the years ended December 31, 2020 and 2021 are as follows: 2020 Beginning Receipt Acquisition Offset the Disposal Others Ending In millions of won Cash ￦ — (41,209 ) — — — 41,209 — Land (21,817 ) — — — 2 (1,660 ) (23,475 ) Buildings (61,920 ) — — 5,206 — (517 ) (57,231 ) Structures (186,554 ) — — 9,526 2,032 (5,013 ) (180,009 ) Machinery (158,907 ) — — 17,468 496 (16,842 ) (157,785 ) Vehicles (2,275 ) — — 2,064 4 (425 ) (632 ) Equipment (241 ) — — 149 — (135 ) (227 ) Tools (403 ) — — 243 — (79 ) (239 ) Construction-in-progress (61,211 ) — 8,783 — — (26,698 ) (79,126 ) Investment properties (13 ) — — 1 — (17 ) (29 ) Software (235 ) — — 99 — — (136 ) Development expenditures (1,492 ) — — 1,453 — (5,004 ) (5,043 ) Intangible assets under development (11,029 ) — — — — 3,826 (7,203 ) Other intangible assets (79 ) — — 4 — — (75 ) ￦ (506,176 ) (41,209 ) 8,783 36,213 2,534 (11,355 ) (511,210 ) 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 )
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, 2020 and 2021 are as follows: 2020 Increase Decrease Contribution Interests Execution Return Department Project Description Period Budget Beginning Self- Local Government Self- Local Government Self- Local Government Self- Local Government Others Ending In millions of won Ministry of Trade, Industry and Energy Temporary electricity bill support for small business owners Temporary electricity bill support for small business owners 2020.04.01 ~ 2020.12.31 72,662 — — — 72,662 — — 16 — — (71,914 ) — — (16 ) — 748 Energy Voucher 2020 Energy Voucher 2020.01.01 ~ 2020.12.31 46,148 — — — 46,148 — — 2 — — (46,148 ) — — (2 ) — — 2021 Increase Decrease Contribution Interests Execution Return Department Project Description Period Budget Beginning Self- Local Government Self- Local Government Self- Local Government Self- Local Government Others Ending In millions of won Ministry of Trade, industry and Energy Temporary electricity bill support for small business owners Temporary electricity bill support for small business owners 2021.04.01 ~ 2022.06.30 211,235 748 — — 139,550 — — — — — (122,563 ) — — — — 17,735

Deferred Revenues (Tables)

Deferred Revenues (Tables)	12 Months Ended
	Dec. 31, 2021
Deferred income including contract liabilities [abstract]
Deferred Revenues	Deferred revenue for the years ended December 31, 2020 and 2021 are as follows which included in current and non-current non-financial liabilities in the consolidated statements of financial position: 2020 2021 In millions of won Beginning balance ￦ 9,201,538 9,868,189 Increase 1,310,128 1,149,578 Recognized as revenue (643,477 ) (661,212 ) Ending balance ￦ 9,868,189 10,356,555

Non-financial Liabilities (Tabl

Non-financial Liabilities (Tables)	12 Months Ended
	Dec. 31, 2021
Other Liabilities Disclosure [Abstract]
Non-financial Liabilities	Non-financial liabilities as of December 31, 2020 and 2021 are as follows: 2020 2021 Current Non-current Current Non-current In millions of won Advance received ￦ 3,693,043 331,596 4,157,916 398,056 Unearned revenue 35,068 6,122 40,187 6,517 Deferred revenue 625,596 9,242,593 659,397 9,697,158 Withholdings 257,059 9,909 345,892 5,171 Others 1,360,684 71,721 1,262,941 109,462 ￦ 5,971,450 9,661,941 6,466,333 10,216,364

Contributed Capital (Tables)

Contributed Capital (Tables)	12 Months Ended
	Dec. 31, 2021
Disclosure of classes of share capital [abstract]
Issued Capital	(1) Details of shares issued as of December 31, 2020 and 2021 are as follows: 2020 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. 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.
Number of Issued Capital	(2) Details in number of outstanding capital stock for the years ended December 31, 2020 and 2021 are as follows. 2020 2021 Number of shares Beginning balance 641,964,077 641,964,077 Ending balance 641,964,077 641,964,077
Share premium	(3) Details of share premium as of December 31, 2020 and 2021 are as follows: 2020 2021 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, 2021
Retained earnings [abstract]
Retained Earnings	(1) Details of retained earnings as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Legal reserve(*) ￦ 1,604,910 1,604,910 Voluntary reserves 32,179,066 33,282,817 Retained earnings before appropriations 17,349,625 10,359,255 Retained earnings ￦ 51,133,601 45,246,982 (*) 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 capital or offset against accumulated deficit by the resolution of the shareholders.
Voluntary reserves	(2) Details of voluntary reserves as of December 31, 2020 and 2021 are as follows: 2020 2021 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 26,361,617 27,465,368 Reserve for equalizing dividends 210,000 210,000 ￦ 32,179,066 33,282,817 (*) 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.
Changes in Retained Earnings	(3) Changes in retained earnings for the years ended December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Beginning balance ￦ 49,202,133 51,133,601 Profit (loss) for the period attributed to owner of the controlling Company 1,991,347 (5,315,055 ) Changes in equity method retained earnings 3,181 3,609 Remeasurements of defined benefit liability, net of tax (62,857 ) 201,067 Transfer of gain (loss) on valuation of financial assets at FVOCI — 4,388 Dividends paid — (780,628 ) Transactions between consolidated entities (203 ) — Ending balance ￦ 51,133,601 45,246,982
Dividends Paid	(4) Dividends paid for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 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 ￦ — — 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
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, 2020 and 2021 are as follows: 2020 2021 In millions of won Beginning balance ￦ (2,820 ) 361 Changes 3,181 3,609 Ending balance ￦ 361 3,970
Changes in retained earnings of remeasurement components	(6) Changes in remeasurement components related to defined benefit liability for the years ended December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Beginning balance ￦ (117,779 ) (169,234 ) Changes (77,828 ) 327,957 Income tax effect 14,971 (126,890 ) Transfer to reserve for business expansion 11,402 67,011 Ending balance ￦ (169,234 ) 98,844

Statements of Appropriation o_2

Statements of Appropriation of Retained Earnings (Disposition of Deficit) (Tables)	12 Months Ended
	Dec. 31, 2021
Statement of Appropriation of Retained Earnings [Abstract]
Statements of Appropriation of Retained Earnings (Disposition of Deficit)	The statements 2020 2021 In millions of won except for I.   Retained earnings before appropriations (undisposed deficit) Unappropriated retained earnings (deficit) carried over from prior years ￦ — — Net income (loss) 1,951,498 (5,607,732 ) Remeasurement of the defined benefit plan (67,118 ) 107,884 1,884,380 (5,499,848 ) II. Transfer from voluntary reserves — 5,499,848 III.  Subtotal ( I+II ) 1,884,380 — IV.  Appropriations of retained earnings (Disposition of deficit) Legal reserve — — Dividends (government, individual) (Amount of dividends per share (%) : Current year – ￦ 0 (0%), Prior year – ￦ 1,216 (24.32%)) (780,628 ) — Reserve for business expansion (1,103,752 ) — (1,884,380 ) — V. Unappropriated retained earnings to be carried over forward to subsequent year — —

Hybrid Bonds (Tables)

Hybrid Bonds (Tables)	12 Months Ended
	Dec. 31, 2021
Hybrid Bonds [Abstract]
Hybrid Bonds	Hybrid bonds classified as equity (non-controlling interest) as of December 31, 2020 and 2021 are as follows: Issuer Hybrid bond Issued date Maturity Yield (%) 2020 2021 In millions of won Korea South-East 1st hybrid bond 2012.12.07 2042.12.06 4.38 ￦ 170,000 170,000 Korea South-East 2nd hybrid bond 2012.12.07 2042.12.06 4.44 230,000 230,000 Expense of issuance (1,090 ) (1,090 ) ￦ 398,910 398,910

Other Components of Equity (Tab

Other Components of Equity (Tables)	12 Months Ended
	Dec. 31, 2021
Disclosure of reserves within equity [abstract]
Summary of Other Components of Equity	(1) Other components of equity of the parent as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Other capital surplus ￦ 1,224,105 1,231,109 Accumulated other comprehensive income (loss) (409,577 ) (57,632 ) Other equity 13,294,973 13,294,973 ￦ 14,109,501 14,468,450
Summary of Changes in Other Capital Surplus	(2) Changes in other capital surplus for the years ended December 31, 2020 and 2021 are as follows: 2020 2021 Gains on treasury stocks Others Subtotal Gains on disposal of treasury stocks Others Subtotal In millions of won Beginning balance ￦ 387,524 838,840 1,226,364 387,524 836,581 1,224,105 Changes in consolidation scope — — — — 43 43 Issuance of share capital of subsidiary — (148 ) (148 ) — (491 ) (491 ) Others — (2,111 ) (2,111 ) — 7,452 7,452 Ending balance ￦ 387,524 836,581 1,224,105 387,524 843,585 1,231,109
Summary of Changes in Accumulated Other Comprehensive Income (Loss)	(3) Changes in accumulated other comprehensive income (loss) for the years ended December 31, 2020 and 2021 are as follows: 2020 Financial asset at fair value through other comprehensive income valuation reserve Shares in other income of investments in associates and Reserve for overseas translation credit Reserve for gain (loss) on derivatives Total In millions of won Beginning balance ￦ (92,599 ) 142,896 (294,898 ) (36,129 ) (280,730 ) Changes in the unrealized fair value of financial assets at FVOCI, net of tax (8,533 ) — — — (8,533 ) Shares in other comprehensive Income(loss) of associates and joint ventures, net of tax — (132,805 ) — — (132,805 ) Foreign currency translation of foreign operations, net of tax — — (46,032 ) — (46,032 ) Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax — — — 58,523 58,523 Ending balance ￦ (101,132 ) 10,091 (340,930 ) 22,394 (409,577 ) 2021 Financial assets at fair value through other comprehensive income valuation reserve Shares in other income of investments in associates and Reserve for overseas translation credit Reserve for gain (loss) on derivatives Total In millions of won Beginning balance ￦ (101,132 ) 10,091 (340,930 ) 22,394 (409,577 ) Changes in the unrealized fair value of financial assets at FVOCI, net of tax 59,022 — — — 59,022 Shares in other comprehensive income of associates and joint ventures, net of tax — 301,161 — — 301,161 Foreign currency translation of foreign operations, net of tax — — 15,760 — 15,760 Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax — — — (19,610 ) (19,610 ) Others (4,388 ) — — — (4,388 ) Ending balance ￦ (46,498 ) 311,252 (325,170 ) 2,784 (57,632 )
Summary of Changes in Other equity	(4) Other equity as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Statutory revaluation reserve ￦ 13,295,098 13,295,098 Changes in other equity (125 ) (125 ) ￦ 13,294,973 13,294,973

Sales (Tables)

Sales (Tables)	12 Months Ended
	Dec. 31, 2021
Revenue [abstract]
Summary of Sales	Details of sales for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 Domestic Overseas Domestic Overseas Domestic Overseas In millions of won [Type of goods and services] Sales of goods ￦ 56,609,330 285,546 56,380,608 303,704 58,261,006 441,203 Electricity 55,939,001 — 55,730,985 — 57,210,231 — Heat supply 220,948 — 198,715 — 232,294 — Others 449,381 285,546 450,908 303,704 818,481 441,203 Sales related to rendering of services 222,106 186,184 223,075 206,275 252,216 204,184 Sales of construction services 110,692 1,154,224 170,895 641,280 159,262 595,736 ￦ 56,942,128 1,625,954 56,774,578 1,151,259 58,672,484 1,241,123 [Timing of revenue recognition] Performance obligations satisfied at a point in time ￦ 56,609,330 285,546 56,380,608 303,704 58,261,006 441,203 Performance obligations satisfied over time 332,798 1,340,408 393,970 847,555 411,478 799,920 ￦ 56,942,128 1,625,954 56,774,578 1,151,259 58,672,484 1,241,123

Selling and Administrative Ex_2

Selling and Administrative Expenses (Tables)	12 Months Ended
	Dec. 31, 2021
Selling, general and administrative expense [abstract]
Summary of Selling and Administrative Expenses	(1) Selling and administrative expenses for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Salaries ￦ 775,204 1,095,183 1,121,188 Retirement benefit expense 157,272 103,967 113,127 Welfare and benefit expense 120,463 155,071 155,558 Insurance expense 12,427 10,178 17,909 Depreciation 232,510 218,103 219,427 Amortization of intangible assets 76,547 87,086 91,428 Bad debt expense (12,719 ) 20,648 17,968 Commission 632,849 368,275 410,275 Advertising expense 34,453 29,559 29,230 Training expense 7,174 5,196 4,923 Vehicle maintenance expense 9,525 9,435 8,849 Publishing expense 3,414 3,677 3,568 Business promotion expense 3,038 3,614 3,522 Rent expense 40,505 36,337 43,650 Telecommunication expense 8,451 8,686 8,569 Transportation expense 865 1,007 870 Taxes and dues 58,666 62,828 93,446 Expendable supplies expense 6,682 8,029 9,052 Water, light and heating expense 11,867 11,749 12,351 Repairs and maintenance expense 88,576 79,185 123,134 Ordinary development expense 224,463 197,436 213,936 Travel expense 15,652 10,793 11,099 Clothing expense 9,369 14,834 10,540 Survey and analysis expense 848 826 889 Membership fee 969 1,274 1,331 Others 150,506 135,467 149,945 ￦ 2,669,576 2,678,443 2,875,784
Summary of Other Selling and Administrative Expenses	(2) Details of “others” included in selling and administrative expenses for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Accommodation development expenses ￦ 53,945 30,889 57,815 Miscellaneous wages 39,794 45,887 47,221 Litigation and filing expenses 21,768 19,341 16,383 Compensation for damages (1,924 ) 8,374 3,303 Outsourcing expenses 3,293 3,610 3,799 Reward expenses 2,858 3,228 3,006 Overseas market development expenses 1,997 1,218 1,192 Others 28,775 22,920 17,226 ￦ 150,506 135,467 149,945

Other Income and Expense (Table

Other Income and Expense (Tables)	12 Months Ended
	Dec. 31, 2021
Disclosure of other operating income (expense) [Abstract]
Summary of Other Income	(1) Other income for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Reversal of other provisions ￦ 16,542 25,826 15,548 Reversal of other allowance for doubtful accounts — 2,465 98 Gains on government grants 281 269 458 Gains on assets contributed 6,921 24,324 9,347 Gains on liabilities exempted 916 1,314 1,830 Compensation and reparations revenue 113,292 95,407 104,826 Revenue from foundation fund — — 1 Revenue from research contracts 5,276 4,001 5,996 Income related to transfer of assets from customers 604,808 643,477 661,212 Rental income 191,088 193,567 204,123 Others 58,849 45,798 30,694 ￦ 997,973 1,036,448 1,034,133
Summary of Details of Others of Other Income	(2) Details of “others” included in other income for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Refund of claim for rectification ￦ 1,969 11,880 7,274 Adjustment of research project 3,294 2,150 7,638 Maintenance expenses on lease building 153 2,785 160 Training expenses 3,167 3,852 1,739 Deposit redemption 436 314 378 Reversal of expenses on litigation 9,926 620 991 Revenue on royalty fee — — 173 Reimbursement of insurance fee 610 22 1 Gains on guarantee contracts 135 134 27 Others 39,159 24,041 12,313 ￦ 58,849 45,798 30,694
Summary of Other Expense	(3) Other expenses for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Compensation and indemnification expense ￦ 403 11,959 663 Accretion expenses of other provisions 7,939 17,991 2,711 Depreciation expenses on investment properties 5,069 1,453 1,386 Depreciation expenses on idle assets 6,542 6,604 3,621 Other bad debt expense 29,348 32,503 49,372 Donations 64,752 316,981 152,456 Others 127,860 30,229 47,723 ￦ 241,913 417,720 257,932
Summary of Others of Other Expense	(4) Details of “others” included in other expenses for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Operating expenses related to the idle assets ￦ 49 46 44 Research grants 399 91 109 Expenses related to supports 13,991 16,115 17,065 Expenses related to of a 5,234 5,101 6,948 Expenses on adjustment of research and development grants 554 720 2,241 Taxes and dues 188 253 119 Expenses on R&D supports 67 242 861 Others 107,378 7,661 20,336 ￦ 127,860 30,229 47,723

Other Gains (Losses) (Tables)

Other Gains (Losses) (Tables)	12 Months Ended
	Dec. 31, 2021
Other Gains (Losses) [Abstract]
Summary of Other Gains (Losses)	(1) Composition of other gains (losses) for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Other gains Gains on disposal of property, plant and equipment ￦ 43,784 93,195 56,284 Gains on disposal of intangible assets 206 1,556 1 Reversal of impairment loss on property, plant and equipment 16,692 7,805 — Reversal of impairment loss on intangible assets — — 14 Gains on foreign currency translation 16,340 8,917 20,598 Gains on foreign currency transaction 53,152 61,865 48,671 Gains on insurance proceeds 17,410 43,800 144 Others 238,688 322,379 250,174 Other losses Losses on disposal of property, plant and equipment (72,508 ) (162,725 ) (92,622 ) Losses on disposal of intangible assets (827 ) (392 ) (145 ) Losses on valuation of other non-current assets — (241 ) — Impairment loss on property, plant and equipment (50,034 ) (80,413 ) (4,056 ) Impairment loss on intangible assets (513,609 ) (3,599 ) — Impairment loss on other non-current assets (49,620 ) — (16,035 ) Losses on foreign currency translation (8,757 ) (17,664 ) (4,732 ) Losses on foreign currency transaction (55,283 ) (49,694 ) (67,990 ) Others (217,892 ) (189,695 ) (181,787 ) ￦ (582,258 ) 35,094 8,519
Summary of Others of Other Gains	(2) Details of “others” included in other gains for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Gains on disposal of inventories ￦ 3,424 3,373 4,446 Gains on proxy collection of TV license fee 41,013 41,438 42,271 Gains on compensation of impaired electric poles 1,372 978 812 Gains on harbor facilities dues 3,741 2,231 3,281 Gains on technical fees 3,044 4,826 3,968 Reversal of occupation development training fees 1,472 352 229 Gains on disposal of waste 5,317 6,927 4,272 Gains on insurance 812 — 690 Gains on tax rebate 341 772 685 Gains on other commission 1,111 1,643 1,822 Gains on disposal of greenhouse gas emissions rights — — 8,739 Gains on disposal of assets held-for-sale 23,778 — 160 Others 153,263 259,839 178,799 ￦ 238,688 322,379 250,174
Summary of Others of Other Losses	(3) Details of “others” included in other losses for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Losses on valuation of inventories ￦ 3,127 4,998 7,761 Losses on disposal of inventories 10,456 37,644 8,874 Losses due to disaster 7,635 16,814 6,238 Losses on rounding adjustment of electric charge surtax 1,268 1,276 1,283 Loss on disposal of greenhouse gas emissions rights — — 11,282 Others 195,406 128,963 146,349 ￦ 217,892 189,695 181,787

Finance Income (Tables)

Finance Income (Tables)	12 Months Ended
	Dec. 31, 2021
Finance income [Abstract]
Summary of Finance Income	(1) Finance income for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Interest income ￦ 268,118 242,586 221,874 Dividends income 13,838 7,316 10,522 Gains on disposal of financial assets 3,866 11,992 7,718 Gains on valuation of financial assets at fair value through profit or loss 5,575 12,904 14,338 Gains on valuation of derivatives 362,735 57,563 860,011 Gains on transaction of derivatives 157,961 146,448 124,900 Gains on foreign currency translation 175,839 1,005,961 146,349 Gains on foreign currency transactions 21,774 24,009 15,618 Other financial income — 1,470 1,284 ￦ 1,009,706 1,510,249 1,402,614
Summary of Interest Income	(2) Details of interest income included in finance income for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Cash and cash equivalents ￦ 42,861 9,419 12,692 Financial assets at fair value through profit or loss 29,411 19,114 18,415 Financial assets at amortized cost 539 612 797 Loans 63,448 26,232 25,196 Short-term financial instruments 49,070 25,540 7,531 Long-term financial instruments 12,794 10,406 12,470 Other financial assets 54 228 230 Trade and other receivables 69,941 151,035 144,543 ￦ 268,118 242,586 221,874

Finance Expenses (Tables)

Finance Expenses (Tables)	12 Months Ended
	Dec. 31, 2021
Finance Expenses [Abstract]
Summary of Finance Expenses	(1) Finance expenses for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Interest expense ￦ 2,046,811 1,995,425 1,914,457 Losses on sale of financial assets 2,106 648 1,045 Losses on valuation of financial assets at fair value through profit or loss 4,513 7,396 5,480 Losses on valuation of derivatives 45,385 513,278 37,017 Losses on transaction of derivatives 71,546 81,055 40,818 Losses on foreign currency translation 553,731 215,047 1,159,334 Losses on foreign currency transaction 55,509 79,103 83,558 Losses on repayment of financial liabilities — 35 10 Others 2,555 4,456 4,058 ￦ 2,782,156 2,896,443 3,245,777
Summary of Interest Expenses	(2) Details of interest expense included in finance expenses for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Trade and other payables ￦ 94,019 88,757 213,765 Short-term borrowings 42,971 29,358 42,371 Long-term borrowings 119,806 118,678 115,141 Debt securities 1,827,511 1,805,253 1,728,588 Other financial liabilities 558,464 540,867 384,423 2,642,771 2,582,913 2,484,288 Less: Capitalized borrowing costs (595,960 ) (587,488 ) (569,831 ) ￦ 2,046,811 1,995,425 1,914,457

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2021
Income tax expense (benefit) [Abstract]
Summary of Income Tax Expense (Benefit)	(1) Income tax expense (benefit) for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Current income tax expense Payment of income tax ￦ 538,223 671,179 357,767 Adjustment in respect of prior years due to change in estimate (176,441 ) (63,756 ) 153,113 Current income tax directly recognized in equity (53,302 ) 51,486 (198,714 ) 308,480 658,909 312,166 Deferred tax expense (benefit) Generation and realization of temporary differences (636,984 ) (77,985 ) (489,411 ) Changes of unrecognized tax losses, tax credit and temporary differences for prior periods (22,469 ) (10,471 ) (43,653 ) Changes in deferred tax on tax losses carryforwards (582,011 ) 296,070 (1,641,823 ) Tax credit carryforwards (71,306 ) 32,541 (12,199 ) Amount due to change in tax rate or regulations 1,987 — 18,931 (1,310,783 ) 240,155 (2,168,155 ) Income tax expense (benefit) ￦ (1,002,303 ) 899,064 (1,855,989 )
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, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Profit (loss) before income tax ￦ (3,265,838 ) 2,991,533 (7,085,214 ) Income tax expense (benefit) computed at applicable tax rate(*1) (898,105 ) 822,672 (1,948,434 ) Adjustments Effect of applying gradual tax rate 10,362 (10,362 ) (10,362 ) Effect of non-taxable income (9,990 ) (13,593 ) (4,983 ) Effect of non-deductible expenses 12,197 46,776 78,814 Effect of tax losses that are not recognized as deferred tax asset 57,490 — 1,351 Effects of tax credits and deduction (76,983 ) (63,753 ) (43,931 ) Reversal of unrecognized deferred tax asset, net (22,469 ) (10,471 ) (43,641 ) Effect of change in deferred tax due to change in tax rate 16,848 (17,590 ) 18,931 Deduction of deferred tax assets — 55,682 73,887 Deferred tax related to investments in subsidiaries, associates and joint ventures 147,598 102,137 (135,878 ) Others, net (62,810 ) 51,322 5,144 72,243 140,148 (60,668 ) Adjustment in respect of prior years due to change in estimate (176,441 ) (63,756 ) 153,113 Income tax expense (benefit) ￦ (1,002,303 ) 899,064 (1,855,989 ) Effective tax rate (*2 ) 30.05 % (*2 ) (*1) Applicable tax rate is 27.5% as of December 31, 2019, 2020 and 2021. (*2) The effective tax rate for the year ended December 31, 2019 and 2021 is not calculated due to income tax benefit and 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, 2019, 2020 and 2021 are as follows: 2019 2020 2021 In millions of won Dividends of hybrid bond and others ￦ 3,432 4,273 4,736
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, 2019, 2020 and 2021 are as follows: 2019 2020 2021 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 ￦ (4,217 ) 19,447 (9,753 ) Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax (15,642 ) (47,231 ) 24,220 Remeasurement of defined benefit liability (40,235 ) 14,971 (126,890 ) Investments in associates 4,275 35,714 (53,672 ) Others (914 ) 24,312 (37,355 ) ￦ (56,733 ) 47,213 (203,450 )
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, 2020 and 2021 are as follows, continued: 2020 Beginning balance Amounts Amount Amounts recognized directly in equity Ending balance In millions of won Deferred tax on temporary differences Employee benefits ￦ 648,847 14,566 26,374 — 689,787 Cash flow hedge (999 ) 63,817 (47,231 ) — 15,587 Investments in subsidiaries, associates and joint ventures (8,665,727 ) (38,002 ) 35,714 — (8,668,015 ) Property, plant and equipment (7,115,218 ) (598,231 ) — — (7,713,449 ) Finance lease (160,443 ) (50,977 ) — — (211,420 ) Intangible assets (55,906 ) 24,740 — — (31,166 ) Financial assets at fair value through profit or loss 341 (328 ) — — 13 Financial assets at fair value through other comprehensive income 18,245 258 19,447 — 37,950 Deferred revenue 213,003 (13,302 ) — — 199,701 Provisions 5,456,919 459,884 — — 5,916,803 Doubtful receivables 59 (59 ) — — — Other finance liabilities 39,364 (13,238 ) — 4,273 30,399 Gains or losses on foreign exchange translation 57,961 (69,596 ) — — (11,635 ) Allowance for doubtful accounts 57,607 (1,478 ) — — 56,129 Accrued income (4,376 ) 13,320 — — 8,944 Special deduction for property, plant and equipment (215,373 ) (10,978 ) — — (226,351 ) Others 1,342,716 150,326 12,909 — 1,505,951 (8,382,980 ) (69,278 ) 47,213 4,273 (8,400,772 ) Deferred tax on unused tax losses and tax credit Unused tax losses 1,111,813 (218,739 ) — — 893,074 Excess of donation limit 36,695 (1,514 ) — — 35,181 Tax credit 107,526 (2,110 ) — — 105,416 1,256,034 (222,363 ) — — 1,033,671 ￦ (7,126,946 ) (291,641 ) 47,213 4,273 (7,367,101 ) 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 )
Summary of Deferred Income Tax Assets (Liabilities)	(6) Deferred tax assets (liabilities) recognized in the consolidated statements of financial position as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Deferred tax assets ￦ 1,733,146 1,901,992 Deferred tax liabilities (9,100,247 ) (7,100,938 ) ￦ (7,367,101 ) (5,198,946 )
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, 2020 and 2021 are as follows: 2020 2021 In millions of won Deductible temporary differences ￦ 1,405,621 1,539,980

Assets Held-for-Sale (Tables)

Assets Held-for-Sale (Tables)	12 Months Ended
	Dec. 31, 2021
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 as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Land(*1) ￦ — 2,907 Buildings(*1) 1 12,971 Investments(*1) — 1 Others(*2) 924 — ￦ 925 15,879 (*1) The board of directors of KEPCO Engineering & Construction Company, Inc., a subsidiary of the Company, made a resolution -si (*2) The Company had decided to sell its shares of DG Fairhaven Power, LLC, a subsidiary of the Company, and classified them as assets held-for-sale as of December 31, 2020. The disposal was completed during the year ended December 31, 2021.

Expenses Classified by Nature (

Expenses Classified by Nature (Tables)	12 Months Ended
	Dec. 31, 2021
Expenses by nature [abstract]
Expenses Classified by Nature	Expenses classified by nature for the years ended December 31, 2019, 2020 and 2021 are as follows: 2019 Selling and Cost of Total In millions of won Raw materials used ￦ — 17,084,029 17,084,029 Salaries 775,204 3,834,772 4,609,976 Retirement benefit expense 157,272 652,467 809,739 Welfare and benefit expense 120,463 443,482 563,945 Insurance expense 12,427 93,702 106,129 Depreciation 232,510 10,734,246 10,966,756 Amortization of intangible assets 76,547 80,368 156,915 Bad debt expense (12,719 ) — (12,719 ) Commission 632,849 378,861 1,011,710 Advertising expense 34,453 9,852 44,305 Training expense 7,174 16,903 24,077 Vehicle maintenance expense 9,525 7,652 17,177 Publishing expense 3,414 3,423 6,837 Business promotion expense 3,038 3,981 7,019 Rent expense 40,505 176,413 216,918 Telecommunication expense 8,451 11,034 19,485 Transportation expense 865 4,555 5,420 Taxes and dues 58,666 481,684 540,350 Expendable supplies expense 6,682 32,999 39,681 Water, light and heating expense 11,867 32,378 44,245 Repairs and maintenance expense 88,576 2,210,278 2,298,854 Ordinary development expense 224,463 511,252 735,715 Travel expense 15,652 68,581 84,233 Clothing expense 9,369 7,539 16,908 Survey and analysis expense 848 3,949 4,797 Membership fee 969 12,730 13,699 Power purchase — 18,269,732 18,269,732 Others 150,506 2,612,973 2,763,479 ￦ 2,669,576 57,779,835 60,449,411 2020 Selling and Cost of Total In millions of won Raw materials used ￦ — 13,544,827 13,544,827 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 — 20,648 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 51,804,596 54,483,039 2021 Selling and Cost of Total In millions of won Raw materials used ￦ — 18,575,160 18,575,160 Salaries 1,121,188 4,272,971 5,394,159 Retirement benefit expense 113,127 487,834 600,961 Welfare and benefit expense 155,558 570,142 725,700 Insurance expense 17,909 104,544 122,453 Depreciation 219,427 11,547,677 11,767,104 Amortization of intangible assets 91,428 74,733 166,161 Bad debt expense 17,968 — 17,968 Commission 410,275 307,211 717,486 Advertising expense 29,230 9,552 38,782 Training expense 4,923 13,276 18,199 Vehicle maintenance expense 8,849 8,152 17,001 Publishing expense 3,568 3,300 6,868 Business promotion expense 3,522 3,777 7,299 Rent expense 43,650 193,470 237,120 Telecommunication expense 8,569 10,959 19,528 Transportation expense 870 53,365 54,235 Taxes and dues 93,446 529,183 622,629 Expendable supplies expense 9,052 41,367 50,419 Water, light and heating expense 12,351 42,934 55,285 Repairs and maintenance expense 123,134 2,492,030 2,615,164 Ordinary development expense 213,936 475,461 689,397 Travel expense 11,099 67,086 78,185 Clothing expense 10,540 7,994 18,534 Survey and analysis expense 889 3,955 4,844 Membership fee 1,331 8,492 9,823 Power purchase — 21,632,127 21,632,127 Others 149,945 2,022,426 2,172,371 ￦ 2,875,784 63,559,178 66,434,962

Earnings (Loss) Per Share (Tabl

Earnings (Loss) Per Share (Tables)	12 Months Ended
	Dec. 31, 2021
Earnings per share [abstract]
Basic earnings per share	(1) Basic earnings (loss) per share for the years ended December 31, 2019, 2020 and 2021 are as follows: Type 2019 2020 2021 In won Basic earnings (loss) per share ￦ (3,654 ) 3,102 (8,279 )
Diluted earnings per share	(2) Diluted earnings (loss) per share for the years ended December 31, 2019, 2020 and 2021 are as follows: Type 2019 2020 2021 In won Diluted earnings (loss) per share ￦ (3,654 ) 3,102 (8,279 )
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, 2019, 2020 and 2021 are as follows: Type 2019 2020 2021 In millions of won except number of shares Profit (loss) attributable to owners of the controlling company ￦ (2,345,517 ) 1,991,347 (5,315,055 ) Profit (loss) used in the calculation of total basic earnings (loss) per share (2,345,517 ) 1,991,347 (5,315,055 ) 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, 2019, 2020 and 2021 are as follows: Type 2019 2020 2021 In millions of won Profit (loss) used in the calculation of total diluted earnings (loss) per share ￦ (2,345,517 ) 1,991,347 (5,315,055 ) 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, 2019, 2020 and 2021 are as follows: Type 2019 2020 2021 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, 2021
Risk Management [Abstract]
Capital risk management	Details of the Company’s capital management accounts as of December 31, 2020 and 2021 are as follows: 2020 2021 In millions of won Total borrowings and debt securities ￦ 69,724,581 80,529,513 Cash and cash equivalents 2,029,584 2,635,238 Net borrowings and debt securities 67,694,997 77,894,275 Total equity 70,666,846 65,311,849 Debt to equity ratio 95.79 % 119.27 %
Credit risk management	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, 2020 and 2021 are as follows: 2020 2021 In millions of won Cash and cash equivalents ￦ 2,029,584 2,635,238 Financial assets at fair value through profit or loss(*1) 1,808,404 932,736 Derivative assets (trading) 110,764 443,027 Financial assets at fair value through other comprehensive income (debt securities) — 491 Financial assets at amortized cost 14,422 25,273 Loans 790,162 909,071 Long-term/short-term financial instruments 2,062,103 1,728,508 Derivative assets (applying hedge accounting) 55,649 204,756 Trade and other receivables 9,780,039 10,029,276 Financial guarantee contracts(*2) 3,224,696 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.
Sensitivity analysis of 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, 2020 and 2021 are as follows: 2020 2021 Type Accounts 1% Increase 1% Decrease 1% Increase 1% Decrease In millions of won Future salary increases Increase (decrease) in defined benefit obligation ￦ 488,087 (425,708 ) 466,832 (407,554 ) Discount rate Increase (decrease) in defined benefit obligation (443,527 ) 524,856 (422,290 ) 499,571 Changes of employee benefits assuming a 1% increase and decrease movements in discount rate on plan asset for the years ended December 31, 2020 and 2021 are ￦20,960 million and ￦25,649 million, respectively.
Changes in provisions due to movements in underlying assumptions	Changes in provisions due to movements in underlying assumptions as of December 31, 2020 and 2021 are as follows: Type Accounts 2020 2021 PCBs Inflation rate 1.06 % 1.37 % Discount rate 1.83 % 1.88 % Nuclear plants Inflation rate 1.07 % 1.41 % Discount rate 2.20 % 2.20 % Spent fuel Inflation rate 2.93 % 2.93 % Discount rate 4.49 % 4.49 %
Sensitivity analysis of Provisions due to movements in underlying assumptions	A sensitivity analysis of provisions assuming a 0.1% increase and decrease movements in the underlying assumptions as of December 31, 2020 and 2021 are as follows: 2020 2021 Type Accounts 0.1% Increase 0.1% Decrease 0.1% Increase 0.1% Decrease In millions of won Discount rate PCBs ￦ (292 ) 293 (222 ) 223 Nuclear plants (326,926 ) 336,928 (369,540 ) 381,026 Spent fuel (51,558 ) 53,571 (51,430 ) 53,438 Inflation rate PCBs 295 (294 ) 224 (224 ) Nuclear plants 357,676 (347,450 ) 403,420 (391,754 ) Spent fuel 54,345 (52,375 ) 54,210 (52,245 )
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, 2020 and 2021 are as follows: Assets Liabilities Type 2020 2021 2020 2021 In thousands of foreign currencies AED 39,678 6,481 31,594 31,637 AUD 133 3,733 707,538 926,960 BDT 93,442 50,145 — 577 BWP 890 939 — — EGP — — 948 595 CAD 247 582 1,840 2,266 CHF — — 500,406 500,230 CZK — — 2,033 386 EUR 310 1,809 121,069 42,981 GBP — — 43 — HKD — — 1,651,839 1,651,665 IDR 342,496 768,731 555,241 995,510 INR 1,231,895 1,715,900 155,134 342,833 JOD 1,673 1,852 — 118 JPY 825,269 697,747 484,585 153,383 KZT 1,510 1,510 — — MGA 5,645,349 4,262,857 — 475,807 MMK 11,032 210,335 — — MYR — 1,964 — — PHP 191,122 164,167 104,161 104,245 PKR 371,328 200,844 12,222 74,423 SAR 2,178 2,615 — — SEK — — 449,824 449,167 USD 1,445,522 1,381,441 12,234,563 12,023,085 UYU 78,265 90,930 1,585 3,097 VND 672,563 952,135 — 262,372 ZAR 303 31,971 — —
Sensitivity analysis of Foreign currency risk	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, 2020 and 2021 are as follows: 2020 2021 Type 10% Increase 10% Decrease 10% Increase 10% Decrease In millions of won Increase (decrease) of profit before income tax ￦ (1,336,821 ) 1,336,821 (1,439,185 ) 1,439,185 Increase (decrease) of equity(*) (1,336,821 ) 1,336,821 (1,439,185 ) 1,439,185 (*) The effect on the shareholders’ equity excluding the impact of income taxes.
Interest rate risk	The Company’s borrowings and debt securities with floating interest rates as of December 31, 2020 and 2021 are as follows: Type 2020 2021 In millions of won Short-term borrowings ￦ 171,518 391,897 Long-term borrowings 2,191,322 2,405,244 Debt securities 250,968 257,667 ￦ 2,613,808 3,054,808
Sensitivity analysis of Interest rate risk	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, 2020 and 2021 are as follows: 2020 2021 Type 1% Increase 1% Decrease 1% Increase 1% Decrease In millions of won Increase (decrease) of profit before income tax ￦ (26,138 ) 26,138 (30,548 ) 30,548 Increase (decrease) of shareholder’s equity(*) (26,138 ) 26,138 (30,548 ) 30,548 (*) The effect on the shareholders’ equity excluding the impact of income taxes.
Electricity rates risk	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, 2020 and 2021 is as follows: 2020 2021 Type 1% Increase 1% Decrease 1% Increase 1% Decrease In millions of won Increase (decrease) of profit before income tax ￦ 557,310 (557,310 ) 572,102 (572,102 ) Increase (decrease) of shareholder’s equity(*) 557,310 (557,310 ) 572,102 (572,102 ) (*) The effect on the equity excluding the impact of income taxes.
Details of maturities of non-derivative financial liabilities	The expected maturities for non-derivative financial liabilities as of December 31, 2020 and 2021 in detail are as follows: 2020 Type Less than 1 year 1~2 Years 2~5 Years More than 5 years Total In millions of won Borrowings and debt securities ￦ 12,413,346 10,919,041 24,778,020 34,215,888 82,326,295 Finance lease liabilities 614,442 569,161 1,564,377 2,461,557 5,209,537 Trade and other payables 5,679,856 373,907 894,903 1,167,171 8,115,837 Financial guarantee contracts(*) 926,244 348,860 26,230 1,923,362 3,224,696 ￦ 19,633,888 12,210,969 27,263,530 39,767,978 98,876,365 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 (*) This represents the total guarantee amounts associated with the financial guarantee contracts. Financial guarantee liabilities which are recognized as of December 31, 2020 and 2021 are ￦66,354 million and ￦80,841 million, respectively.
The expected maturities for non-derivative financial assets	The expected maturities for non-derivative financial assets as of December 31, 2020 and 2021 in detail are as follows: 2020 Type Less than 1 year 1~5 Years More than 5 years Other (*) Total In millions of won Cash and cash equivalents ￦ 2,029,584 — — — 2,029,584 Financial assets at fair value through other comprehensive income — — — 358,559 358,559 Financial assets at amortized cost 13,149 1,265 8 — 14,422 Loans 78,805 385,571 325,212 31,506 821,094 Long-term/short-term financial instruments 1,483,482 252,349 386 325,886 2,062,103 Financial assets at fair value through profit or loss 1,196,101 — 2,690 682,591 1,881,382 Trade and other receivables 7,920,005 1,160,400 704,494 — 9,784,899 ￦ 12,721,126 1,799,585 1,032,790 1,398,542 16,952,043 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 (*) The maturities cannot be presently determined.
Derivative liabilities classified by maturity periods which from reporting date to maturity date of contracts	Derivative liabilities classified by maturity periods which from reporting date to maturity dates as per the contracts as of December 31, 2020 and 2021 are as follows: 2020 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 (12,777 ) (22,827 ) (118,704 ) (4,380 ) (158,688 ) —Hedging (37,858 ) (39,528 ) (75,450 ) (55,208 ) (208,044 ) ￦ (50,635 ) (62,355 ) (194,154 ) (59,588 ) (366,732 ) 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 (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 )
Derivative assets classified by maturity periods which from reporting date to maturity dates as per the contracts	Derivative assets classified by maturity periods which from reporting date to maturity dates as per the contracts as of December 31, 2020 and 2021 are as follows: 2020 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 18,332 1,529 45,237 52,163 117,261 —Hedging 11,191 — 41,206 3,252 55,649 ￦ 29,523 1,529 86,443 55,415 172,910 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
Fair value and book value of financial assets and liabilities	Fair value and book value of financial assets and liabilities as of December 31, 2020 and 2021 are as follows: 2020 2021 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 ￦ 358,559 358,559 435,107 435,107 Derivative assets (trading) 110,764 110,764 443,027 443,027 Derivative assets (applying hedge accounting) 55,649 55,649 204,756 204,756 Financial assets at fair value through profit or loss 1,881,382 1,881,382 1,032,864 1,032,864 ￦ 2,406,354 2,406,354 2,115,754 2,115,754 Assets carried at amortized cost Financial assets at amortized cost ￦ 14,422 14,422 25,273 25,273 Loans and receivables 790,162 790,162 909,071 909,071 Trade and other receivables 9,780,039 9,780,039 10,029,276 10,029,276 Long-term financial instruments 578,621 578,621 450,494 450,494 Short-term financial instruments 1,483,482 1,483,482 1,278,014 1,278,014 Cash and cash equivalents 2,029,584 2,029,584 2,635,238 2,635,238 ￦ 14,676,310 14,676,310 15,327,366 15,327,366 Liabilities recognized at fair value Derivative liabilities (trading) ￦ 157,926 157,926 56,256 56,256 Derivative liabilities (applying hedge accounting) 207,193 207,193 21,775 21,775 ￦ 365,119 365,119 78,031 78,031 Liabilities carried at amortized cost Secured borrowings ￦ 63,614 63,614 176,358 176,358 Unsecured bond 64,607,401 68,839,316 73,881,671 69,803,043 Lease liabilities 4,621,096 4,621,096 4,410,503 4,410,503 Unsecured borrowings 4,808,206 5,513,242 6,471,484 5,938,613 Trade and other payables(*) 8,115,837 8,115,837 9,739,421 9,739,421 Bank overdraft 245,360 245,360 — — ￦ 82,461,514 87,398,465 94,679,437 90,067,938 (*) Excludes lease liabilities.
Interest rates used for determining fair value	The discount rates Type 2020 2021 Derivatives (-) 0.73% ~ 3.08% (-) 0.63% ~ 3.88% Borrowings and debt securities (-) 0.53% ~ 4.38% (-) 0.30% ~ 4.38% Finance lease 0.57% ~ 16.60% 0.00% ~ 16.83%
Fair value hierarchy	Fair values of financial instruments by hierarchy level as of December 31, 2020 and 2021 are as follows: 2020 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 ￦ 194,670 — 163,889 358,559 Derivative assets — 166,413 — 166,413 Financial assets at fair value through profit or loss — 1,875,690 5,692 1,881,382 ￦ 194,670 2,042,103 169,581 2,406,354 Financial liabilities at fair value Derivative liabilities ￦ — 365,119 — 365,119 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
Changes of financial assets and liabilities which are classified as level 3	Changes of financial assets and liabilities which are classified as level 3 for the years ended December 31, 2020 and 2021 are as follows: 2020 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 ￦ 5,156 359 — 623 (446 ) — 5,692 Financial assets at fair value through other comprehensive income Unlisted securities 177,968 2,900 — (23,128 ) (1 ) 6,150 163,889 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

Service Concession Arrangemen_2

Service Concession Arrangements (Tables)	12 Months Ended
	Dec. 31, 2021
Disclosure of detailed information about service concession arrangements [abstract]
Gas Complex Thermal Power Plant at Ilijan, Philippines	(iii) The Company’s expected future collections of service concession arrangements as of December 31, 2021 are as follows: Type Amounts In millions of won Less than 1 year ￦ 51,596
Hydroelectric Power Generation at Semangka, Indonesia	(iii) The Company’s expected future collections of service concession arrangements as of December 31, 2021 are as follows: Type Amounts In millions of won Less than 1 year ￦ 29,576 1 ~ 2 years 29,610 2 ~ 3 years 29,747 Over 3 years 542,683 ￦ 631,616

Related parties (Tables)

Related parties (Tables)	12 Months Ended
	Dec. 31, 2021
Disclosure of transactions between related parties [abstract]
Summary of Related Party Transactions	(3) Related party transactions for the years ended December 31, 2019, 2020 and 2021 are as follows: <Sales and Others> Sales and others Company name Transaction type 2019 2020 2021 In millions of won <Associates> Dongducheon Dream Power Co., Ltd. Electricity sales ￦ 7,071 7,757 19,923 Korea Gas Corporation Electricity sales 116,484 97,685 96,362 Daejung Offshore Wind Power Co., Ltd. Electricity sales 1 32 46 Daegu Photovoltaic Co., Ltd. Electricity sales 327 325 207 Haeng Bok Do Si Photovoltaic Power Co., Ltd. Electricity sales 2 2 2 Korea Electric Power Industrial Development Co., Ltd. Service 11,085 10,833 11,208 Goseong Green Power Co., Ltd. Electricity sales 19,245 47,701 514,470 Gangneung Eco Power Co., Ltd. Service 7,446 10,178 14,200 Shin Pyeongtaek Power Co., Ltd. Electricity sales 21,218 20,791 23,501 Noeul Green Energy Co., Ltd. Electricity sales 30 30 30 Samcheok Eco Materials Co., Ltd. Electricity sales 627 700 620 YTN Co., Ltd. Electricity sales 2,257 1,805 1,922 Busan Green Energy Co., Ltd. Electricity sales 18 34 49 Gunsan Bio Energy Co., Ltd. Electricity sales 4,755 102 20 Korea Electric Vehicle Charging Service Electricity sales 1,029 1,956 3,059 Energy Infra Asset Management Co., Ltd. Electricity sales — — 4,629 Gangwon Wind Power Co., Ltd. Electricity sales 2,433 2,109 1,865 Gwangyang Green Energy Co., Ltd. Electricity sales 122 23 486 Bigeum Resident Photovoltaic Power Co., Ltd. Electricity sales — 85 755 Hyundai Green Power Co., Ltd. Electricity sales and design service 13,106 17,257 11,934 Korea Power Exchange Service 7,670 25,919 39,796 Taebaek Wind Power Co., Ltd. Service 991 226 44 Taebaek Guinemi Wind Power Co., Ltd. Electricity sales 77 37 26 Pyeongchang Wind Power Co., Ltd. Electricity sales 1,189 2,064 1,180 Daeryun Power Co., Ltd. Electricity sales 1,879 1,947 1,944 Changjuk Wind Power Co., Ltd. Electricity sales 927 2,067 463 GS Donghae Electric Power Co., Ltd. Electricity sales 15,792 31,557 21,127 KNH Solar Co., Ltd. Electricity sales 17 16 14 S-Power Co., Ltd. Service 6,535 6,682 5,229 PND Solar Electricity sales 407 409 416 Hyundai Eco Energy Co., Ltd. Electricity sales 117 167 187 YeongGwang Yaksu Wind Electric Co., Ltd. Electricity sales 81 77 78 Taebaek Gadeoksan Wind Power Co., Ltd.(*2) Electricity sales — — 295 Korea Energy Solutions Co., Ltd. Electricity sales 52 7 2 ITR Co., Ltd. Service — — 3 Structure test network Co., Ltd. Service — — 5 Green Energy Electricity Generation Co., Ltd. Electricity sales — 14 — Namjeongsusang Solar Power Operation Co., Ltd. Electricity sales — 14 22 Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 Service — 291 399 Bitgoel Eco Energy Co., Ltd. Electricity sales — — 282 Muan Solar Park Co., Ltd. Electricity sales — 57 232 Anjwa Smart Farm & Solar City Co., Ltd. Electricity sales — — 624 Daewon Green Energy Co., Ltd. Electricity sales — — 155 Saemangeum Heemang Photovoltaic Co., Ltd. Electricity sales — — 13 UD4M Co., Ltd. Electricity sales — — 4 Dongbu Highway Solar Co., Ltd. Electricity sales — — 5 Seobu Highway Solar Co., Ltd. Electricity sales — — 8 SureDataLab Co., Ltd. Electricity sales — — 1 Suwon New Power Co., Ltd. Electricity sales 5,606 2,974 1,820 Hankook Electric Power Information Co., Ltd. Electricity sales — — 1 Kosture Electricity sales — — 1 Muan Sunshine Solar Power Plant Co., Ltd. Electricity sales — 30 52 9 Associates (Overseas) Electricity sales and others 98,450 66,755 125,723 Sales and others Company name Transaction type 2019 2020 2021 In millions of won <Joint ventures> Naepo Green Energy Co., Ltd. Electricity sales ￦ 154 217 467 Cheongna Energy Co., Ltd. Service 9,922 13,791 16,469 Dayone Energy Co., Ltd.(formerly, Hyundai Energy Co., Ltd.) Service 3,437 4,816 8,159 Daegu Green Power Co., Ltd. Electricity sales 1,151 1,285 1,053 KAPES, Inc. Commission 504 476 413 Honam Wind Power Co., Ltd. Electricity sales 657 502 71 Jeongam Wind Power Co., Ltd. (*1) Electricity sales and 1,198 1,213 588 Korea Power Engineering Service Co., Ltd. Service 348 203 339 Seokmun Energy Co., Ltd. Service 1,495 1,932 1,701 Incheon New Power Co., Ltd. Construction revenue 354 14 14 Chun-cheon Energy Co., Ltd. Electricity sales 2,397 2,657 2,329 Yeonggwangbaeksu Wind Power Co., Ltd. Electricity sales 1,744 1,788 1,836 Yeonggwang Wind Power Co., Ltd. Electricity sales 705 793 818 Sam-Yang Photovoltaic Power Co., Ltd. Electricity sales — 33 1,920 NH-Amundi Global Infrastructure Investment Private Investment Trust 21 Service — 1,388 1,727 KW Nuclear Components Co., Ltd. Service 721 1,639 2,598 KEPCO-Uhde Inc. Electricity sales 15 8 10 Busan Shinho Solar Power Co., Ltd. Electricity sales 452 353 376 Daesan Green Energy Co., Ltd. Electricity sales 39 703 523 Taebaek Gadeoksan Wind Power Co., Ltd. (*2) Electricity sales — 3 2 Cheong-Song Noraesan Wind Power Co., Ltd. Electricity sales 6 29 30 Chungsongmeon BongSan wind power Co., Ltd. Electricity sales — — 1 Saemangeum Solar Power Co., Ltd. Service 2,230 2,846 1,141 Jaeun Resident Wind Power Plant Co., Ltd. Electricity sales 105 — — Dangjin Eco Power co., Ltd. Electricity sales 4 33 32 Energyco Co., Ltd. (formerly, Energyco LLC) Electricity sales — — 1 Busan Industrial Solar Power Co., Ltd. Electricity sales — — 9 Bitsolar Energy Co., Ltd. Electricity sales — 42 296 Omisan Wind Power Co., Ltd. Electricity sales — — 1 Haemodum Solar Co., Ltd. Electricity sales — 4 6 Yeongam Solar Power Co., Ltd. Electricity sales — 165 339 Solaseado Solar Power Co., Ltd. Electricity sales — 66 2,890 35 Joint ventures (Overseas) Electricity sales and others 1,275,279 831,596 773,289 <Others> Korea Development Bank Electricity sales 3,948 4,248 4,177 Interest income 2,091 3,461 756 <Purchase and Others> Purchase and others Company name Transaction type 2019 2020 2021 In millions of won <Associates> Dongducheon Dream Power Co., Ltd. Electricity purchase ￦ 689,510 552,692 750,148 Korea Gas Corporation Purchase of power generation fuel 4,049,486 3,270,972 5,646,713 Daegu Photovoltaic Co., Ltd. REC purchase 3,626 3,313 3,532 Haeng Bok Do Si Photovoltaic Power Co., Ltd. REC purchase 450 370 393 Korea Electric Power Industrial Development Co., Ltd. Electricity metering service 245,057 212,366 241,925 Goseong Green Power Co., Ltd. Electricity purchase 32 — 987,540 Shin Pyeongtaek Power Co., Ltd. Electricity purchase 119,162 520,737 653,306 Noeul Green Energy Co., Ltd. REC purchase 22,767 10,634 10,014 Samcheok Eco Materials Co., Ltd. Electricity purchase 9,425 10,713 13,612 YTN Co., Ltd. Service 333 353 388 Busan Green Energy Co., Ltd. Electricity purchase 13,811 18,678 18,996 Gunsan Bio Energy Co., Ltd. Electricity purchase 3,022 24 — Korea Electric Vehicle Charging Service Service 536 581 393 Energy Infra Asset Management Co., Ltd. Service — — 2,657 Yaksu ESS Co., Ltd. Service 1,191 217 1,715 Gangwon Wind Power Co., Ltd. Electricity purchase 24,116 23,350 19,623 Goesan Solar park Co., Ltd. Electricity purchase — — 6,209 Hyundai Green Power Co., Ltd. Electricity purchase 507,662 349,778 — Korea Power Exchange Trading fees 120,509 87,361 86,716 Taebaek Wind Power Co., Ltd. Electricity purchase 7,070 4,003 5,930 Taebaek Guinemi Wind Power Co., Ltd. Electricity purchase 349 5,023 5,910 Pyeongchang Wind Power Co., Ltd. Electricity purchase 5,188 3,969 4,099 Daeryun Power Co., Ltd. Electricity purchase 144,862 99,523 157,234 Changjuk Wind Power Co., Ltd. Electricity purchase 6,994 6,084 6,213 GS Donghae Electric Power Co., Ltd. Electricity purchase 681,379 660,351 760,377 KNH Solar Co., Ltd. Electricity purchase 3,377 3,564 3,222 S-Power Co., Ltd. Electricity purchase 522,469 293,515 608,530 PND Solar Electricity purchase 557 5,234 5,502 Hyundai Eco Energy Co., Ltd. Electricity purchase 6,810 17,777 25,762 YeongGwang Yaksu Wind Electric Co., Ltd. Electricity purchase 6,511 9,151 11,729 Taebaek Gadeoksan Wind Power Co., Ltd. (*2) Electricity purchase — — 16,360 Green Energy Electricity Generation Co., Ltd. Electricity purchase — — 1,238 Namjeongsusang Solar Power Operation Co., Ltd. Electricity purchase — — 14,286 Jeju Gimnyeong Wind Power Co., Ltd. Electricity purchase — — 12,833 Seoroseoro Sunny Power Plant Co., Ltd. Electricity purchase — — 217 Muan Solar Park Co., Ltd. Electricity purchase — — 31,017 YuDang Solar Co., Ltd. Electricity purchase — — 3,495 Anjwa Smart Farm & Solar City Co., Ltd. Electricity purchase — — 24,601 Dongbu Highway Solar Co., Ltd. Electricity purchase — — 2,605 Seobu Highway Solar Co., Ltd. Electricity purchase — — 2,936 Korea Energy Solution Co., Ltd. Electricity purchase 15 — — Gwangbaek Solar Power Investment Co., Ltd. Electricity purchase — 373 742 Muan Sunshine Solar Power Plant Co., Ltd. Electricity purchase — — 15,900 1 Associates (Overseas) Electricity purchase — — 502 <Purchase and Others> Purchase and others Company name Transaction type 2019 2020 2021 In millions of won <Joint ventures> Cheongna Energy Co., Ltd. Electricity purchase ￦ 58,747 66 57 Dayone Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.) Electricity purchase 2,847 1,120 5,409 Daegu Green Power Co., Ltd. Electricity purchase 296,464 215,224 289,052 KAPES, Inc. Service 142,511 219,673 64,140 Honam Wind Power Co., Ltd. Electricity purchase 5,306 4,382 4,807 Jeongam Wind Power Co., Ltd. (*1) Electricity purchase — 5,982 3,145 Korea Power Engineering Service Co., Ltd. Service 1,774 1,594 1,315 Seokmun Energy Co., Ltd. Electricity purchase 26,370 33,164 44,315 Chun-cheon Energy Co., Ltd. Electricity purchase 313,471 222,069 327,536 Yeonggwangbaeksu Wind Power Co., Ltd. Electricity purchase 11,739 11,232 9,471 Yeonggwang Wind Power Co., Ltd. Electricity purchase 11,940 24,103 21,004 Sam-Yang Photovoltaic Power Co., Ltd. Electricity purchase — 3,848 5,852 KW Nuclear Components Co., Ltd. Service — — 96 Busan Shinho Solar Power Co., Ltd. REC purchase 7,843 7,296 7,895 Global Trade Of Power System Co., Ltd. Service 502 337 323 Expressway Solar-light Power Generation Co., Ltd. REC purchase 3,067 2,472 3,146 Daesan Green Energy Co., Ltd. Electricity purchase — 104,854 146,776 Taebaek Gadeoksan Wind Power Co., Ltd. (*2) Electricity purchase — — 5,080 Saemangeum Solar Power Co., Ltd. Electricity purchase — — 5 Dangjin Eco Power Co., Ltd. Electricity purchase — 3,953 4,139 Busan Industrial Solar Power Co., Ltd. Electricity purchase — 19 2,815 Bitsolar Energy Co., Ltd. Electricity purchase — — 5,703 Omisan Wind Power Co., Ltd. Electricity purchase — — 7 Haemodum Solar Co., Ltd. Electricity purchase — 967 1,625 Yeongam Solar Power Co., Ltd. Electricity purchase — 32,208 47,805 Samsu Wind Power Co., Ltd. Electricity purchase — — 2,800 Solaseado Solar Power Co., Ltd. Electricity purchase — 28,516 31,031 5 Joint ventures (Overseas) Electricity purchase and 7,232 14,767 49,055 <Others> Korea Development Bank Interest expense 4,063 3,872 2,756 Dividends paid 20 17 256,862 (*1) Reclassified from a joint venture to a subsidiary during the year ended December 31, 2021. Transactions are made before the reclassification. (*2) Reclassified from a joint venture to an associate during the year ended December 31, 2021.
Summary of Receivables and Payables Arising From Related Party Transactions	(4) Receivables and payables arising from related party transactions as of December 31, 2020 and 2021 are as follows: Receivables Payables Company name Type 2020 2021 2020 2021 In millions of won <Associates> Dongducheon Dream Power Co., Ltd. Trade receivables ￦ 388 6,282 — — Non-trade receivables and others 213 493 — — Trade payables — — 65,794 114,613 Korea Gas Corporation Trade receivables 9,969 10,015 — — Non-trade receivables and others 95 187 — — Trade payables — — 428,763 800,509 Non-trade payables and others — — 617 759 Daejung Offshore Wind Power Co., Ltd. Non-trade receivables and others 31 77 — — Daegu Photovoltaic Co., Ltd. Trade payables — — 57 115 Korea Electric Power Industrial Development Co., Ltd. Trade receivables 508 269 — — Non-trade receivables and others 16 15 — — Trade payables — — 133 873 Non-trade payables and others — — 3,779 5,880 Goseong Green Power Co., Ltd. Trade receivables 2,181 495 — — Non-trade receivables and others 9,214 76,855 — — Trade payables — — — 218,627 Non-trade payables and others — — 64,986 59,987 Gangneung Eco Power Co., Ltd. Trade receivables 661 826 — — Non-trade receivables and others 146 465 — — Non-trade payables and others — — — 97 Shin Pyeongtaek Power Co., Ltd. Trade receivables 1,348 1,788 — — Non-trade receivables and others 2,823 3,116 — — Trade payables — — 47,948 79,828 Non-trade payables and others — — 85 99 Noeul Green Energy Co., Ltd. Trade receivables 3 3 — — Non-trade receivables and others 969 1,169 — — Samcheok Eco Materials Co., Ltd. Trade receivables 47 52 — — YTN Co., Ltd. Trade receivables 97 99 — — Busan Green Energy Co., Ltd. Trade receivables 5 1 — — Non-trade receivables and others 13,946 20,658 — — Gunsan Bio Energy Co., Ltd. Non-trade receivables and others — 11,728 — — Korea Electric Vehicle Charging Service Trade receivables 141 193 — — Non-trade receivables and others 281 120 — — Yaksu ESS Co., Ltd. Trade payables — — 739 1,374 Gangwon Wind Power Co., Ltd. Trade receivables 6 8 — — Trade payables — — 2,678 4,293 Gwangyang Green Energy Co., Ltd. Non-trade receivables and others 1,356 532 — — Bigeum Resident Photovoltaic Power Co., Ltd. Trade receivables — 922 — — Goesan Solar park Co., Ltd. Trade payables — — — 73 Hyundai Green Power Co., Ltd. Trade receivables 554 229 — — Trade payables — — 9,825 — Korea Power Exchange Trade receivables 1,608 627 — — Non-trade receivables and others 24 1,300 — — Trade payables — — 1,362 — Non-trade payables and others — — 70,456 2,189 Taebaek Wind Power Co., Ltd. Non-trade receivables and others 1,405 — — — Trade payables — — 443 560 Non-trade payables and others — — — 262 Taebaek Guinemi Wind Power Co., Ltd. Trade payables — — 413 670 Non-trade payables and others — — 509 — Pyeongchang Wind Power Co., Ltd. Trade receivables 3 4 — — Daeryun Power Co., Ltd. Trade receivables 189 213 — — Trade payables — — 16,079 21,362 Changjuk Wind Power Co., Ltd. Trade payables — — 461 724 Non-trade payables and others — — 309 295 GS Donghae Electric Power Co., Ltd. Trade receivables 386 383 — — Non-trade receivables and others 321 272 — — Trade payables — — 91,213 113,529 Non-trade payables and others — — 36 17 Receivables Payables Company name Type 2020 2021 2020 2021 In millions of won <Associates> KNH Solar Co., Ltd. Trade receivables ￦ 1 1 — — Trade payables — — 14 — Non-trade payables and others — — 187 — Trade receivables 137 82 — — S-Power Co., Ltd. Non-trade receivables and others 46 48 — — Trade payables — — 23,415 91,277 PND Solar Trade payables — — 58 — Hyundai Eco Energy Co., Ltd. Trade receivables 16 19 — — Trade payables — — — 732 YeongGwang Yaksu Wind Electric Co., Ltd. Trade receivables 8 6 — — Taebaek Gadeoksan Wind Power Co., Ltd.(*2) Non-trade receivables and others — 119 — — Trade payables — — — 8,397 Non-trade payables and others — — — 1,571 Bitgoel Eco Energy Co., Ltd. Non-trade receivables and others — 27 — — Jeju Gimnyeong Wind Power Co., Ltd. Trade payables — — — 885 Muan Solar Park Trade receivables 24 — — — Non-trade receivables and others — 23 — — Daewon Green Energy Co., Ltd. Non-trade receivables and others — 94 — — Dongbu Highway Solar Co., Ltd. Trade receivables — 1 — — Trade payables — — — 98 Non-trade payables and others — — — 90 Seobu Highway Solar Co., Ltd. Trade payables — — — 177 Non-trade payables and others — — — 105 Go deok Clean Energy Co., Ltd. Non-trade receivables and others 1 — — — Suwon New Power Co., Ltd. Trade receivables 2 — — — Non-trade receivables and others 712 1,198 — — Kosture Trade receivables — 1 — — Muan Sunshine Solar Power Plant Co., Ltd. Trade payables — — — 1,748 4 Associates (Overseas) Non-trade receivables and others 3,248 3,196 — — Non-trade payables and others — — — 502 <Joint ventures> Naepo Green Energy Co., Ltd. Trade receivables 56 42 — — Dayone Energy Co., Ltd. Trade receivables 57 52 — — Non-trade receivables and others 11,749 13,297 — — Trade payables — — 10 1,009 Non-trade payables and others — — 9,119 11,306 Daegu Green Power Co., Ltd. Trade receivables 44 71 — — Non-trade receivables and others 55 55 — — Trade payables — — 26,213 35,766 KAPES, Inc. Trade receivables 2 2 — — Non-trade receivables and others 5,172 — — — Non-trade payables and others — — 20,577 2,121 Honam Wind Power Co., Ltd. Trade payables — — 216 575 Non-trade payables and others — — 345 — Jeongam Wind Power Co., Ltd.(*1) Non-trade receivables and others 162 — — — Non-trade payables and others — — 692 — Korea Power Engineering Service Co., Ltd. Non-trade receivables and others 43 48 — — Seokmun Energy Co., Ltd. Trade receivables 62 34 — — Non-trade receivables and others 9,460 149 — — Trade payables — — 4,898 7,941 Non-trade payables and others — — 9,559 — Chun-cheon Energy Co., Ltd. Trade receivables 98 126 — — Non-trade receivables and others 165 167 — — Trade payables — — 27,428 41,410 Yeonggwangbaeksu Wind Power Co., Ltd. Trade receivables 8 6 — — Non-trade receivables and others 159 53 — — Trade payables — — 405 1,099 Non-trade payables and others — — 1,747 — Receivables Payables Company name Type 2020 2021 2020 2021 In millions of won <Joint ventures> Cheongna Energy Co., Ltd. Trade receivables ￦ 1,592 4,164 — — Non-trade receivables and others 1,186 1,350 — — Non-trade payables and others — — — 1 Yeonggwang Wind Power Co., Ltd. Trade receivables 12 10 — — Non-trade receivables and others 54 59 — — Trade payables — — 886 730 Non-trade payables and others — — 3,038 — Sam-Yang Photovoltaic Power Co., Ltd. Trade receivables 5 5 — — Non-trade payables and others — — 625 — KW Nuclear Components Co., Ltd. Trade receivables 4 — — — KEPCO-Uhde Inc. Non-trade payables and others — — — 10 Busan Shinho Solar Power Co., Ltd. Trade receivables 2 2 — — Trade payables — — 135 281 Non-trade payables and others — — 780 — Global Trade Of Power System Co., Ltd. Non-trade payables and others — — — 7 Expressway Solar-light Power Generation Co., Ltd. Trade payables — — — 102 Daesan Green Energy Co., Ltd. Trade receivables 11 11 — — Non-trade receivables and others 216 120 — — Trade payables — — 7,694 5,120 Taebaek Gadeoksan Wind Power Co., Ltd.(*2) Non-trade receivables and others 5 — — — Trade payables — — 2,473 — Non-trade payables and others — — 5 — Cheong-Song Noraesan Wind Power Co., Ltd. Trade receivables 2 2 — — Saemangeum Solar Power Co., Ltd. Non-trade receivables and others 3,141 4,268 — — Dangjin Eco Power Co., Ltd. Trade receivables 3 3 — — Trade payables — — 326 276 Busan Industrial Solar Power Co., Ltd. Trade receivables — 1 — — Trade payables — — 1 54 Non-trade payables and others — — — 24 Bitsolar Energy Co., Ltd. Non-trade receivables and others — 7 — — Non-trade payables and others — — — 54 Haemodum Solar Co., Ltd. Trade receivables — 1 — — Yeongam Solar Power Co., Ltd. Trade receivables 26 29 — — Trade payables — — 14,652 3,324 Samsu Wind Power Co., Ltd. Trade payables — — — 1,300 18 Joint ventures (Overseas) Trade receivables 58,839 84,150 — — Non-trade receivables and others 17,217 26,060 — — Non-trade payables and others — — 105,682 22,050 <Others> Korea Development Bank Accrued interest income 51 154 — — Non-trade receivables and others 206,916 420,732 — — Non-trade payables and others — — 123 21,172 Derivatives 20,167 59,139 20,001 — (*1) Reclassified from a joint venture to a subsidiary during the year ended December 31, 2021. Transactions are made before the reclassification. (*2) Reclassified from a joint venture to an associate during the year ended December 31, 2021.
Summary of Loans and Others Arising From Related Party Transaction	(5) Loans and others arising from related party transactions as of December 31, 2020 and 2021 are as follows: Type Company name Beginning Loans Collection Others Ending balance In millions of won Associate KNOC Nigerian East Oil Co., Ltd., KNOC Nigerian West Oil Co., Ltd. ￦ 27,149 34 — 2,298 29,481 (Allowance for doubtful accounts) (5,246 ) — — (2,995 ) (8,241 ) Associate Xe-Pian Xe-Namnoy Power Co., Ltd. 19,692 — — 1,764 21,456 Associate PT Wampu Electric Power 12,358 — (1,349 ) 1,991 13,000 Associate Gunsan Bio Energy Co., Ltd. 12,396 — — — 12,396 (Allowance for doubtful accounts) (10,128 ) (2,268 ) — — (12,396 ) Associate Bigeum Resident Photovoltaic Power Co., Ltd. 3,500 7,712 — — 11,212 Associate Daejung Offshore Wind Power Co., Ltd. 1,000 — — — 1,000 Associate Bitgoel Eco Energy Co., Ltd. — 19,349 — — 19,349 Joint venture Solaseado Solar Power Co., Ltd. 64,000 10,000 (39,000 ) — 35,000 Joint venture Recursos Solares De Mexico D e 4,844 2,282 (1,450 ) 458 6,134 Joint venture Horus Solar e 13,380 2,755 (843 ) 1,222 16,514 Joint venture Sunmex Renovables, S.A. d 1,842 11,377 — 352 13,571 Joint venture Kelar S.A. 39,616 — — 3,551 43,167 Joint venture DE Energia SpA 6,232 — — 559 6,791 Joint venture Daehan Wind Power PSC 10,700 1,927 — 1,047 13,674 Joint venture PT. Tanjung Power Indonesia 705 314 — 71 1,090 Joint venture Bitsolar Energy Co., Ltd. 3,165 — — — 3,165 Joint venture Pulau Indah Power Plant Sdn. Bhd. — 10,006 — (10,006 ) — Joint venture Guadalupe Solar SpA — 3,365 (6 ) 1 3,360 Joint venture Foresight Iberian Solar Group Holding, S.L. — 9,376 (424 ) 50,381 59,333 Joint venture Capman Lynx SCA, SICAR — 30,001 — (231 ) 29,770 ￦ 205,205 106,230 (43,072 ) 50,463 318,826
Summary of Borrowings Arising From Related Party Transactions	(6) Borrowings arising from related party transactions as of December 31, 2020 and 2021 are as follows: Related parties Type Beginning balance Borrowings Repayment Others Ending balance In millions of won Korea Development Bank Facility ￦ 50,293 56,906 (10,863 ) 1,684 98,020 Others 2,946 — (437 ) — 2,509 Operating funds 144,300 140,000 (100,000 ) — 184,300 Syndicated Loans 15,923 — (1,042 ) (351 ) 14,530 EBL and others 40,093 9,923 — 3,949 53,965 ￦ 253,555 206,829 (112,342 ) 5,282 353,324
Summary of Guarantees Provided To Associates Or Joint Ventures	(7) Guarantees provided to associates or joint ventures as of December 31, 2021 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 Korea Electric Power Corporation Rabigh Operation & Maintenance Company Limited Performance guarantees and others USD 1,387 Rabigh Electricity Korea Electric Power Corporation Nghi Son 2 Power LLC Performance guarantees USD 70,000 SMBC Ho Chi Minh and Debt guarantees USD 285,000 SMBC Singapore Korea Electric Power Corporation Barakah One Company Debt guarantees USD 1,223,355 Export-Import Bank of Performance guarantees and others USD 4,349,360 Korea Electric Power Corporation RE Holiday Holdings LLC Performance guarantees(*10) USD 222,077 EFS Renewables Holdings, Korea Electric Power Corporation RE Pioneer Holdings LLC Performance guarantees USD 106,873 EFS Renewables Holdings, Korea Electric Power Corporation RE Barren Ridge 1 Holdings LLC Performance guarantees(*10) USD 68,838 Firstar Development, LLC 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 Korea Electric Power Corporation Sunmex Renovables, S.A. De C.V. Other performance guarantees USD 9,078 CENACE Korea Electric Power Corporation MXN 3,666 SEMARNAT Korea Electric Power Corporation Pulau Indah Power Plant Sdn. Bhd. Collateralized money invested KRW 22,099 Malaysian Trustee Berhad Korea Western Power Co., Ltd. Cheongna Energy Co., Ltd. Collateralized money invested KRW 11,198 Kookmin Bank and others Guarantees for supplemental funding (*1) — Korea Western Power Co., Ltd. Xe-Pian Xe-Namnoy Power Co., Ltd. Payment guarantees for business reserve USD 2,500 Krung Thai Bank Collateralized money invested KRW 92,441 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 2,342 Korea Development Bank Korea Western Power Co., Ltd. Dongducheon Dream Power Co., Ltd. Collateralized money invested(*5) KRW 39,524 Kookmin Bank and others Debt guarantees KRW 20,300 BNK Securities Korea Western Power Co., Ltd. PT. Mutiara Jawa Collateralized money invested KRW 2,569 Woori Bank Korea Western Power Co., Ltd. Haeng Bok Do Si Photovoltaic Power Co., Ltd. Collateralized money invested KRW 223 Nonghyup Bank Korea Western Power Co., Ltd. Shin Pyeongtaek Power Co., Ltd. Collateralized money invested KRW 93,074 Kookmin Bank and others Guarantees for supplemental funding(*1) — Korea Western Power Co., Ltd. Haemodum Solar Co., Ltd. Collateralized money invested KRW 3,081 Nonghyup Bank Korea Western Power Co., Ltd. Sam-Yang Photovoltaic Power Co., Ltd. Collateralized money invested KRW 4,993 Korea Development Bank Guarantees for supplemental funding(*1) — Korea Western Power Co., Ltd. Muan Solar Park Co., Ltd. Collateralized money invested KRW 6,083 IBK and others Korea Western Power Co., Ltd. Anjwa Smart Farm & Solar City Co., Ltd. Collateralized money invested KRW 6,784 Hana Bank and others Primary guarantor Principal obligor Type of guarantees Credit limit Creditor In millions of won Korea Western Power Co., Ltd. Seoroseoro Sunny Power Plant Co., Ltd. Collateralized money invested KRW 721 Hana Bank and others Guarantees for supplemental funding(*1) — Korea Western Power Co., Ltd. YuDang Solar Co., Ltd. Collateralized money invested KRW 565 Hana Bank and others Guarantees for supplemental funding(*1) — Korea Western Power Co., Ltd. Hapcheon Floating Photovoltaic Power Plant Inc. Collateralized money invested KRW 6,971 Nonghyup Bank and others Korea Western Power Co., Ltd. Yeongwol Eco Wind Co., Ltd. Collateralized money invested KRW 3,197 Hana Bank and others Guarantees for supplemental funding(*1) — Korea Western Power Co., Ltd. Gurae Resident Power Co., Ltd. Collateralized money invested Guarantees for supplemental funding(*1) KRW 396 — Hana Bank and others Korea Western Power Co., Ltd Gunsan Land Solar Co., Ltd. Collateralized money invested KRW 19,317 Hana Bank and others Guarantees for supplemental funding(*1) — Korea East-West Power Co., Ltd. Busan Shinho Solar Power Co., Ltd. Collateralized money invested KRW 5,841 Korea Development Bank Korea East-West Power Co., Ltd. Seokmun Energy Co., Ltd. Collateralized money invested KRW 13,842 Kookmin Bank and others Guarantees for supplemental funding(*1) — Korea East-West Power Co., Ltd. Chun-cheon Energy Co., Ltd. Collateralized money invested KRW 25,896 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 4,041 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 243,772 Korea Development Bank Korea East-West Power Co., Ltd. Yeonggwangbaeksu Wind Power Co., Ltd. Collateralized money invested KRW 2,728 Kookmin Bank and others Korea East-West Power Co., Ltd. Yeonggwang Wind Power Co., Ltd. Collateralized money invested KRW 17,646 KDB Capital Corporation Korea East-West Power Co., Ltd. Daesan Green Energy Co., Ltd. Collateralized money invested KRW 21,244 IBK Guarantees for supplemental funding(*1) KRW 18,989 Korea East-West Power Co., Ltd. Taebaek Gadeoksan Wind Power Co., Ltd. Collateralized money invested KRW 16,495 Hana Bank and others Guarantees for supplemental funding(*1) — Korea East-West Power Co., Ltd. PT. Tanjung Power Indonesia Debt guarantees USD 24,544 Sumitomo mitsui banking Other guarantees USD 3,150 PT. Adaro Indonesia Guarantees for supplemental funding(*1) — Sumitomo mitsui banking Collateralized money invested KRW 46,546 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 Collateralized money invested KRW 37,360 JCSD Trustee Services Korea East-West Power Co., Ltd. DE Energia SpA Collateralized money invested KRW 8,921 Mirae Asset Daewoo Co., Collateralized loans USD 5,728 Payment guarantees(*8) USD 950 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 5,465 Kyobo Life Insurance Co., Guarantees for supplemental funding(*1) — Korea East-West Power Co., Ltd. Busan Industrial Solar Power Co., Ltd. Collateralized money invested KRW 612 Shinhan Bank and others Guarantees for supplemental funding(*1) — Korea East-West Power Co., Ltd. Yangyang Wind Power Co., Ltd. Collateralized money invested KRW 11,191 Hana Bank and others Guarantees for supplemental funding(*1) — Korea East-West Power Co., Ltd. Daewon Green Energy Co., Ltd. Collateralized money invested KRW 3,877 Hana Bank and others Guarantees for supplemental funding(*1) — Korea East-West Power Co., Ltd. Goheung New Energy Co., Ltd. Collateralized money invested KRW 3,577 Woori Bank and others Guarantees for supplemental funding(*1) — Primary guarantor Principal obligor Type of guarantees Credit limit Creditor In millions of won Korea Southern Power Co., Ltd. KNH Solar Co., Ltd. Collateralized money invested KRW 2,278 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 25,426 Korea Development Bank Korea Southern Power Co., Ltd. Daegu Green Power Co., Ltd. Collateralized money invested KRW 24,054 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 1,500 Shinhan Bank Payment guarantees(*7) USD 1,898 Hana Bank Korea Southern Power Co., Ltd. Pyeongchang Wind Power Co., Ltd. Collateralized money invested KRW 5,411 Woori Bank and Shinhan Performance guarantees — Korea Southern Power Co., Ltd. Taebaek Guinemi Wind Power Co., Ltd. Collateralized money invested KRW 3,357 IBK Korea Southern Power Co., Ltd. Samcheok Eco Materials Co., Ltd. Payment guarantees(*2) — SEM Investment Co., Ltd. Korea Southern Power Co., Ltd. Solaseado Solar Power Co., Ltd. Collateralized money invested KRW 7,360 Kookmin Bank and others Korea Southern Power Co., Ltd. Naepo Green Energy Co., Ltd. Collateralized money invested(*9) — 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 10,634 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 Guarantees for supplemental funding(*1) KRW 6,053 — Kookmin Bank KOSPO Chile SpA Kelar S.A. Collateralized money invested KRW 86,695 Export-Import Bank of KOSPO Chile SpA Chester Solar I SpA Collateralized money invested KRW 1,120 IBK KOSPO Chile SpA Chester Solar IV SpA Collateralized money invested — IBK KOSPO Chile SpA Chester Solar V SpA Collateralized money invested KRW 25 IBK KOSPO Chile SpA Diego de Almagro Solar SpA Collateralized money invested KRW 362 IBK KOSPO Chile SpA Laurel SpA Collateralized money invested KRW 290 IBK Korea Midland Power Co., Ltd. YeongGwang Yaksu Wind Electric Co., Ltd. Collateralized money invested KRW 233 IBK and others Korea Midland Power Co., Ltd. Hyundai Green Power Co., Ltd. Collateralized money invested KRW 121,955 Korea Development Bank Korea Midland Power Co., Ltd. PT. Cirebon Electric Power Debt guarantees USD 9,955 Mizuho Bank Korea Midland Power Co., Ltd. PT Wampu Electric Power Debt guarantees USD 4,817 SMBC Korea Midland Power Co., Ltd. Green Energy Electricity Generation Co., Ltd. Collateralized money invested KRW 1,713 IBK Guarantees for supplemental funding and others(*1) — IBK and others Korea Midland Power Co., Ltd. Yaksu ESS Co., Ltd. Collateralized money invested KRW 716 IBK Korea Midland Power Co., Ltd. Namjeongsusang Solar Power Operation Co., Ltd. Collateralized money invested KRW 361 IBK Korea Midland Power Co., Ltd. Gwangbaek Solar Power Investment Co., Ltd. Collateralized money invested KRW 4,806 Kyobo Life Insurance Co., Korea Midland Power Co., Ltd. Muan Sunshine Solar Power Plant Co., Ltd. Collateralized money invested KRW 1,268 IBK Korea Midland Power Co., Ltd. Goesan Solar park Co., Ltd. Collateralized money invested KRW 1,927 IBK Korea Midland Power Co., Ltd. Bitgoel Eco Energy Co., Ltd. Collateralized money invested KRW 4,356 IBK and others Guarantees for supplemental funding(*1) — Korea Midland Power Co., Ltd. Energyco Co., Ltd. (formerly, Energyco LLC) Collateralized money invested KRW 1,535 Nonghyup Bank Korea Midland Power Co., Ltd. Jeju Gimnyeong Wind Power Co., Ltd. Collateralized money invested KRW 911 Nonghyup Bank Korea Midland Power Co., Ltd. Dongbu Highway Solar Co., Ltd. Collateralized money invested KRW 265 Nonghyup Bank Primary guarantor Principal obligor Type of guarantees Credit limit Creditor In millions of won Korea Midland Power Co., Ltd. Seobu Highway Solar Co., Ltd. Collateralized money invested KRW 289 Nonghyup Bank Korea South-East Power Co., Ltd. Dayone Energy Co., Ltd. Collateralized money invested(*3) — IBK Guarantees KRW 76,800 NH investment & securities Korea South-East Power Co., Ltd. RES Technology AD Collateralized money invested KRW 16,703 UniCredit Bulbank and Korea South-East Power Co., Ltd. ASM-BG Investicii AD Collateralized money invested KRW 18,692 UniCredit Bulbank and Korea South-East Power Co., Ltd. Expressway Solar-light Power Generation Co., Ltd. Guarantees for supplemental funding and others KRW 1,856 Woori Bank Korea South-East Power Co., Ltd. Goseong Green Power Co., Ltd. Collateralized money invested KRW 260,858 Kyobo Life Insurance Co., Korea South-East Power Co., Ltd. Gangneung Eco Power Co., Ltd. Collateralized money invested KRW 2,288 Kyobo Life Insurance Co., Korea South-East Power Co., Ltd. PND Solar Co., Ltd. Collateralized money invested KRW 1,229 IBK Korea South-East Power Co., Ltd. Hyundai Eco Energy Co., Ltd. Collateralized money invested KRW 5,572 Samsung Life Insurance Korea South-East Power Co., Ltd. Jaeun Resident Wind Power Plant Co., Ltd. Collateralized money invested KRW 1,958 IBK Korea South-East Power Co., Ltd. Chungsongmeon BongSan wind power Co., Ltd. Collateralized money invested KRW 3,808 Kyobo Life Insurance Co., Korea South-East Power Co., Ltd. Yeongam Solar Power Co., Ltd. Collateralized money invested KRW 6,838 Kookmin Bank and others Korea South-East Power Co., Ltd. Samsu Wind Power Co., Ltd. Collateralized money invested KRW 2,828 Shinhan Bank and others Korea South-East Power Co., Ltd. Saemangeum Heemang Photovoltaic Co., Ltd. Collateralized money invested KRW 10,238 Woori Bank and others Korea Hydro & Nuclear Power Co., Ltd. Noeul Green Energy Co., Ltd. Collateralized money invested KRW 3,809 Hana Bank and others Korea Hydro & Nuclear Power Co., Ltd. Busan Green Energy Co., Ltd. Collateralized money invested KRW 5,033 Shinhan Bank and others Korea Hydro & Nuclear Power Co., Ltd. Go deok Clean Energy Co., Ltd. Collateralized money invested KRW 4,301 Kookmin Bank and others Korea Hydro & Nuclear Power Co., Ltd. Cheong-Song Noraesan Wind Power Co., Ltd. Collateralized money invested KRW 4,106 Woori Bank and others Korea Hydro & Nuclear Power Co., Ltd. Gwangyang Green Energy Co., Ltd. Collateralized money invested KRW 25,465 Shinhan Bank and others KEPCO Plant Service & Engineering Co., Ltd. Incheon New Power Co., Ltd. Collateralized money invested(*6) — Shinhan Bank Guarantees for supplemental funding and others(*1) — (*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 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, 2021, 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. (*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 ￦26,772 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 recognized an impairment loss on all of the equity securities of Incheon New Power Co., Ltd. during the year ended December 31, 2019, and the acquisition cost of the securities provided as collateral is ￦461 million. (*7) The Company provided a payment guarantee to Daehan Wind Power PSC for opening LC for Debt Service Reserve Account (DSRA). (*8) This includes a guarantee related to LC for debt repayment allowance provided to DE Energia SpA, a joint venture of the Company. (*9) 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. (*10) 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.
Summary of Derivatives Transactions With Related Parties	(9) Derivatives transactions with related parties as of December 31, 2021 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 2020~2026 118,910 USD 100,000 0.61 % 1.00 % 1,189.10 2019~2022 112,650 USD 100,000 1.80 % 3.38 % 1,126.50 2021~2026 114,230 USD 100,000 1.27 % 1.25 % 1,142.30 2018~2023 320,880 USD 300,000 2.03 % 3.75 % 1,069.60 2019~2022 117,340 USD 100,000 1.06 % 2.38 % 1,173.40 2017~2022 113,300 USD 100,000 1.94 % 2.63 % 1,133.00 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 (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 2021.09.27 2022.01.07 ￦ 59,049 USD 50,050 ￦ 1,179.80
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 Type 2019 2020 2021 In millions of won Salaries ￦ 1,315 1,295 1,272 Retirement benefits 31 58 21 ￦ 1,346 1,353 1,293

Statement of Cash Flows (Tables

Statement of Cash Flows (Tables)	12 Months Ended
	Dec. 31, 2021
Non Cash Transactions [Abstract]
Summary of Significant Non-cash Activities	(1) Significant non-cash transactions for the years ended December 31, 2019, 2020, and 2021 are as follows: Transactions 2019 2020 2021 In millions of won Transfer from construction-in-progress to other assets ￦ 14,052,094 10,189,527 12,902,589 Recognition of asset retirement cost and related provision for decommissioning costs 2,425,668 895,507 2,356,805 Transfer from provision for disposal of spent nuclear fuel to accrued expenses 376,103 395,921 455,401 Transfer from long-term borrowings and debt securities to current portion of long-term borrowings and debt securities 7,759,284 9,237,883 11,109,271 Transfer from inventory to stored nuclear fuel 1,129,374 1,055,974 908,842 Transfer of right-of-use assets due to change in accounting policy and others 5,364,647 291,334 78,213
Summary of Changes in Liabilities Incurred From Financing Activities	(2) Changes in liabilities incurred from financing activities for the years ended December 31, 2020, and 2021 are as follows: 2020 Non-cash changes Beginning Cash flows Increase Effect of fluctuations Ending balance In millions of won Borrowings and debt securities ￦ 67,876,541 2,538,787 — (690,747 ) 69,724,581 Lease liabilities 5,070,133 (613,977 ) 275,686 (110,746 ) 4,621,096 ￦ 72,946,674 1,924,810 275,686 (801,493 ) 74,345,677 2021 Non-cash changes Beginning Cash flows Increase Effect of fluctuations Ending balance 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

Commitments for Expenditure (Ta

Commitments for Expenditure (Tables)	12 Months Ended
	Dec. 31, 2021
Commitments for Expenditure [Abstract]
Summary of Commitments For Acquisition of Property, Plant and Equipment	(1) The commitments related to 2020 2021 Contracts Commitment Remaining liability balances Commitment Remaining In millions of won Purchase of cable (PVC, 1C, 2000SQ) 153,000M and others (Shin-Bupyung-Youngseo) ￦ 56,574 16,038 57,046 16,240 Purchase of cable (PVC, 1C, 2500SQ) 103,374M and others (Bukdangjin-Shin-Tangjung) 45,390 32,876 46,616 34,102 Purchase of GIS (362kV, 6300A, 63kA) 23CB – Youngseo S/S 36,143 29,898 36,143 25,292 Purchase of GIS (362kV, 6300A, 63kA) 26CB – Hwasung S/S 40,010 8,328 40,010 5,540 Purchase of GIS (362kV, 6300A, 63kA) 27CB – Kwangyang S/S 37,744 2,244 37,744 140 Purchase of cable (FR CNCO-W, 1C, 325SQ) 1,400,000M 59,716 37,249 — — Purchase of switch (Eco) 9,360 units 40,631 24,031 — — Purchase of cable (TR CNCE-W,1C,600SQ) 551,200M 37,288 23,100 — — Purchase of cable (TR CNCE-W/AL,1C,400SQ) 4,464,000M 82,622 51,130 — — Purchase of cable (FR CNCO-W,1C,325SQ) 1,092,000M 42,068 35,358 — — Concrete pole (10M, general purpose, 350KGF) 102,435 ea and five other equipments 91,889 80,904 — — Purchase of cable (PVC, 1C, 2500SQ) 100,548M and others — — 56,860 34,576 Purchase of GIS (362kV, 6300A, 63kA) 25CB – Migeum S/S — — 32,000 26,700 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 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 Purchase of GIS (362KV, 6300A, 63KA) 25 – Shinyangsan S/S 31,464 31,464 Construction of Shin-Kori Units (#5,6) 8,625,387 3,256,117 9,800,424 3,479,667 Construction of Shin-Hanul Units (#1,2) 9,443,635 160,512 9,745,123 — Other 30 contracts 107,586 58,466 792,485 620,593 Service of designing Seoul Combined Units (#1,2) 31,841 984 31,841 934 Service of designing Shin-Boryeong Units (#1,2) 121,163 521 121,114 — Purchase of furnace for construction of Shin-Seocheon Thermal Power Plant 305,209 29,042 305,209 7,722 Purchase of turbine generator for construction of Shin-Seocheon Thermal Power Plant 105,226 8,279 105,226 6,301 Electricity construction of Shin-Seocheon Thermal Power Plant 282,234 13,524 340,356 — Purchase of main machine for Jeju LNG Combined 166,287 11,182 166,287 10,972 Service of designing Taean U 112,813 12,933 112,909 12,623 Purchase of gas turbines and turbine equipment of Gimpo Combined Heat & Power Plant 104,600 41,840 126,302 61,735 Purchase of steam turbine, HRSG and Popwer Block of Gimpo Combined Heat & Power Plant 210,900 147,630 214,053 138,244 Construction of Gimpo Combined Heat & Power Plant — — 130,015 86,323 Purchase of coal handling machine for construction of Samcheok Units (#1,2) 285,158 22,751 286,571 6,215 Purchase of furnace main equipment for construction of Samcheok Units (#1,2) 1,065,141 11,609 — — Purchase of turbine main equipment for Samcheok U 211,349 125 — — Purchase of main equipment for Namjeju 140,144 112 140,144 3 Purchase of main equipment for Shin-Sejong Combined Thermal Power Plant — — 234,392 200,122
Summary of Commitments For Inventory Purchase	Contract periods for ore concentrates, conversion, enrichment and design and fabrication are as follows: Type Periods Contracted Concentrate 2020 ~ 2030 32,435 Ton U3O8 Transformed 2020 ~ 2030 18,088 Ton U Enrichment 2020 ~ 2030 17,667 Ton SWU

Contingencies and Commitments (

Contingencies and Commitments (Tables)	12 Months Ended
	Dec. 31, 2021
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, 2020 and 2021 are as follows: 2020 2021 Number Claim Number Claim In millions of won As the defendant 663 ￦ 550,535 683 ￦ 689,415 As the plaintiff 200 729,798 284 784,453
Summary of Credit Lines Provided By Financial Institutions	(3) Credit lines provided by financial institutions as of December 31, 2021 are as follows: Commitments Financial institutions Currency Credit limit Used amount In millions of won and thousands of foreign currencies Commitments on Bank-overdraft Nonghyup Bank and others KRW 1,815,500 208,018 Commitments on Bank-daylight overdraft Nonghyup Bank KRW 280,000 — Limit amount available for CP Hana Bank and others KRW 1,050,000 1,050,000 Limit amount available for card Hana Bank and others Banco de Oro KRW PHP 47,404 5,529 Loan limit Kookmin Bank and others DBS Bank Ltd and others KRW USD 1,780,028 1,319,181 Certification of payment on payables from foreign country Nonghyup Bank USD 8,700 7,213 Certification of payment on L/C Shinhan Bank and others USD 1,019,834 463,355 Shinhan Bank JPY 707,337 — Hana Bank and others EUR 48,122 41,262 Certification of Performance guarantee on contract Seoul Guarantee Insurance and others KRW 104,705 96,658 First Abu Dhabi Bank and others USD 947,707 682,903 Korea Development Bank and others JPY 620,000 620,000 Hana Bank EUR 3,965 3,965 Shinhan Bank INR 51,678 51,678 Certification of bidding Hana Bank USD 5,200 197 Advance payment bond, Warranty bond, Retention bond and others Seoul Guarantee Insurance KRW 49,874 49,874 Hana Bank and others USD 331,072 286,388 Hana Bank SAR 6,508 6,508 Hana Bank and others MXN 21,597 20,027 Others Nonghyup Bank and others KRW 610,983 29,730 Export-Import Bank of Korea and others USD 2,625,372 1,842,173 Standard Chartered AED 50 50 Inclusive credit Hana Bank KRW 8,000 825 Hana Bank and others USD 135,078 15,633 Trade finance Export-Import Bank of Korea and others USD 850,000 149,328
Summary of Blank Check And Assets Provided As Collaterals Or Pledges To Financial Institutions By The Company Explanatory	(4) As of December 31, 2021, blank check and assets provided as collaterals or pledges to financial institutions by the Company are follows: Guarantor Creditor Assets provided as security Currency Amount Description In millions of won and thousands of foreign currencies Mira Power Limited International Finance Corporation and others 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 396,120 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 236,570 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 debt securities(*1) Incheon Fuel Cell Co., Ltd. Kookmin Bank and others Cash and cash equivalents and others KRW 276,960 Collateral for borrowings(*2) TS Energy No. 25 Co., Ltd. Kyobo Life Insurance Co., Ltd. and others Property, plant and equipment and others KRW 521,281 Collateral for borrowings(*2) Jeongam Wind Power Co., Ltd. KDB Capital Corporation and others Cash and cash equivalents and others KRW 221,631 Collateral for borrowings(*2) (*1) Based on the credit limits of the respective loans. (*2) As of December 31, 2021, 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, 2021. The Company has provided blank check as a repayment guarantee.

Business Combination (Tables)

Business Combination (Tables)	12 Months Ended
	Dec. 31, 2021
Disclosure of detailed information about business combination [abstract]
Summary of Business Combinations	(1) Details of the business combination that occurred for the year ended December 31, 2019 are as follows: Company Key operation Date of Transfer In millions of won Eumseong Natural Gas Power Co., Ltd. Power generation 2019.12.23 225,758
Summary of Transfer Price At Fair Value Given By The Acquirer of The Business Combination	(2) Details of the transfer price at fair value given by the acquirer of the business combination for the year ended December 31, 2019 are as follows: Type Amounts In millions of won Cash and cash equivalents(*) ￦ 166,700 Fair value of the shares owned before the acquisition 59,058 ￦ 225,758 (*) The outstanding payment of ￦10,000 million as of December 31, 2019, has been received during the current year.
Summary of Fair Values of Assets and Liabilities Acquired Through The Business Combination At The Acquisition Date	(3) The fair values of assets and liabilities acquired through the business combination at the acquisition date for the year ended December 31, 2019 are as follows: Type Amounts In millions of won Fair value of the identifiable assets Current assets Cash and cash equivalents ￦ 2,389 Trade and other receivables 55 Non-current assets Property, plant and equipment 54 Intangible assets 172,434 Other assets 60 Fair value of the identifiable liabilities Current liabilities Borrowings (2,900 ) Non-current liabilities Deferred tax liabilities (41,729 ) ￦ 130,363
Summary of Goodwill Resulting From The Business Combination	(4) Details of goodwill resulting from the business combination for the year ended December 31, 2019 are as follows: Type Amounts In millions of won Fair value of transfer price ￦ 225,758 Less : Fair value of the identifiable net assets (130,363 ) ￦ 95,395
Summary of Net cash Outflows From The Business Combination	(5) Net cash outflows from the business combination for the years ended December 31, 2019 and 2020 are as follows: Type 2019 2020 In millions of won Cash paid for the acquisition ￦ 156,700 10,000 Less: Cash and cash equivalents received (2,389 ) — ￦ 154,311 10,000

Subsequent Events (Tables)

Subsequent Events (Tables)	12 Months Ended
	Dec. 31, 2021
Disclosure of non-adjusting events after reporting period [abstract]
Summary of Subsequent Events	(1) Subsequent to December 31, 2021, the Company and its subsidiaries including 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. and Korea East-West Power Co., Ltd. issued corporate bonds for the purposes of repayment of existing debts and others as follows: Company Type Issue date Maturity Interest rate Amount In millions of won and thousands of USD Korea Electric Power Corporation #1117 Corporate bond 2022.01.04 2025.01.04 2.33 % KRW 150,000 #1118 Corporate bond 2022.01.04 2027.01.04 2.53 % KRW 200,000 #1119 Corporate bond 2022.01.06 2029.01.06 2.75 % KRW 200,000 #1120 Corporate bond 2022.01.06 2032.01.06 2.83 % KRW 100,000 #1121 Corporate bond 2022.01.10 2025.01.10 2.50 % KRW 270,000 #1122 Corporate bond 2022.01.10 2029.01.10 2.83 % KRW 200,000 #1123 Corporate bond 2022.01.12 2027.01.12 2.69 % KRW 280,000 #1124 Corporate bond 2022.01.12 2032.01.12 2.90 % KRW 120,000 #1125 Corporate bond 2022.01.19 2025.01.19 2.58 % KRW 160,000 #1126 Corporate bond 2022.01.19 2029.01.19 2.92 % KRW 100,000 #1127 Corporate bond 2022.01.25 2027.01.25 2.80 % KRW 150,000 #1128 Corporate bond 2022.01.25 2032.01.25 2.98 % KRW 100,000 #1129 Corporate bond 2022.01.27 2025.01.27 2.70 % KRW 190,000 #1130 Corporate bond 2022.01.27 2029.01.27 2.99 % KRW 140,000 #1131 Corporate bond 2022.02.04 2027.02.04 2.97 % KRW 190,000 #1132 Corporate bond 2022.02.04 2032.02.04 3.05 % KRW 160,000 #1133 Corporate bond 2022.02.08 2025.02.08 2.80 % KRW 150,000 #1134 Corporate bond 2022.02.08 2029.02.08 3.10 % KRW 140,000 #1135 Corporate bond 2022.02.10 2027.02.10 3.03 % KRW 300,000 #1136 Corporate bond 2022.02.10 2032.02.10 3.17 % KRW 70,000 #1137 Corporate bond 2022.02.14 2025.02.14 2.89 % KRW 200,000 #1138 Corporate bond 2022.02.14 2029.02.14 3.19 % KRW 90,000 #1139 Corporate bond 2022.02.18 2025.02.18 2.86 % KRW 180,000 #1140 Corporate bond 2022.02.18 2027.02.18 3.08 % KRW 110,000 #1141 Corporate bond 2022.02.22 2025.02.22 2.93 % KRW 160,000 #1142 Corporate bond 2022.02.22 2027.02.22 3.15 % KRW 130,000 #1143 Corporate bond 2022.02.25 2025.02.25 2.82 % KRW 120,000 #1144 Corporate bond 2022.02.25 2027.02.25 3.09 % KRW 40,000 #1145 Corporate bond 2022.03.02 2025.03.02 2.85 % KRW 150,000 #1146 Corporate bond 2022.03.02 2027.03.02 3.12 % KRW 160,000 #1147 Corporate bond 2022.03.04 2025.03.04 2.84 % KRW 190,000 #1148 Corporate bond 2022.03.04 2027.03.04 3.12 % KRW 90,000 #1149 Corporate bond 2022.03.04 2029.03.04 3.15 % KRW 20,000 #1150 Corporate bond 2022.03.07 2025.03.07 2.82 % KRW 160,000 #1151 Corporate bond 2022.03.07 2027.03.07 3.11 % KRW 90,000 #1152 Corporate bond 2022.03.07 2029.03.07 3.15 % KRW 50,000 #1153 Corporate bond 2022.03.10 2025.03.10 2.88 % KRW 170,000 #1154 Corporate bond 2022.03.10 2027.03.10 3.10 % KRW 130,000 #1155 Corporate bond 2022.03.16 2025.03.16 2.89 % KRW 210,000 #1156 Corporate bond 2022.03.16 2027.03.16 3.10 % KRW 130,000 #1157 Corporate bond 2022.03.18 2025.03.18 2.93 % KRW 180,000 #1158 Corporate bond 2022.03.18 2027.03.18 3.09 % KRW 180,000 #1159 Corporate bond 2022.03.24 2024.03.24 2.73 % KRW 160,000 #1160 Corporate bond 2022.03.24 2027.03.24 3.29 % KRW 80,000 #1161 Corporate bond 2022.03.28 2052.03.28 3.30 % KRW 130,000 #1162 Corporate bond 2022.03.30 2024.03.30 3.01 % KRW 100,000 #1163 Corporate bond 2022.03.30 2025.03.30 3.35 % KRW 60,000 #1164 Corporate bond 2022.03.30 2027.03.30 3.49 % KRW 30,000 #1165 Corporate bond 2022.04.01 2024.04.01 3.07 % KRW 150,000 #1166 Corporate bond 2022.04.01 2025.04.01 3.45 % KRW 160,000 #1167 Corporate bond 2022.04.01 2032.04.01 3.50 % KRW 10,000 #1168 Corporate bond 2022.04.05 2024.04.05 3.19 % KRW 130,000 #1169 Corporate bond 2022.04.05 2025.04.05 3.46 % KRW 70,000 #1170 Corporate bond 2022.04.05 2027.04.05 3.61 % KRW 70,000 #1171 Corporate bond 2022.04.07 2024.04.07 3.36 % KRW 100,000 #1172 Corporate bond 2022.04.07 2025.04.07 3.58 % KRW 50,000 #1173 Corporate bond 2022.04.07 2027.04.07 3.70 % KRW 20,000 #1174 Corporate bond 2022.04.11 2024.04.11 3.65 % KRW 160,000 #1175 Corporate bond 2022.04.11 2025.04.11 3.71 % KRW 40,000 #1176 Corporate bond 2022.04.11 2027.04.11 3.84 % KRW 10,000 #1177 Corporate bond 2022.04.15 2024.04.15 3.55 % KRW 230,000 Company Type Issue date Maturity Interest rate Amount In millions of won and thousands of USD Korea Electric Power Corporation #1178 Corporate bond 2022.04.15 2025.04.15 3.70 % KRW 60,000 #1179 Corporate bond 2022.04.15 2027.04.15 3.72 % KRW 10,000 #1180 Corporate bond 2022.04.19 2023.10.19 3.29 % KRW 230,000 #1181 Corporate bond 2022.04.19 2025.04.19 3.70 % KRW 80,000 #1182 Corporate bond 2022.04.21 2023.10.21 3.19 % KRW 200,000 #1183 Corporate bond 2022.04.21 2025.04.21 3.71 % KRW 150,000 #1184 Corporate bond 2022.04.21 2052.04.21 3.72 % KRW 100,000 #1185 Corporate bond 2022.04.26 2024.04.26 3.30 % KRW 130,000 #1186 Corporate bond 2022.04.26 2025.04.26 3.65 % KRW 130,000 #1187 Corporate bond 2022.04.26 2027.04.26 3.77 % KRW 60,000 #1188 Corporate bond 2022.04.28 2024.04.28 3.35 % KRW 210,000 #1189 Corporate bond 2022.04.28 2025.04.28 3.70 % KRW 260,000 #1190 Corporate bond 2022.04.28 2027.04.28 3.77 % KRW 30,000 Korea Hydro & Nuclear Power Co., Ltd. #63-1 Corporate bond 2022.02.17 2027.02.17 2.81 % KRW 40,000 #63-2 Corporate bond 2022.02.17 2042.02.17 3.04 % KRW 60,000 #63-3 Corporate bond 2022.02.17 2052.02.17 2.97 % KRW 50,000 #64-1 Corporate bond 2022.03.11 2042.03.11 3.10 % KRW 70,000 #64-2 Corporate bond 2022.03.11 2052.03.11 3.02 % KRW 80,000 #65-1 Corporate bond 2022.04.22 2027.04.22 3.68 % KRW 30,000 #65-2 Corporate bond 2022.04.22 2042.04.22 3.84 % KRW 60,000 #65-3 Corporate bond 2022.04.22 2052.04.22 3.72 % KRW 20,000 Korea South-East Power Co., Ltd. Corporate bond 2022.03.28 2027.03.28 3.30 % KRW 10,000 Corporate bond 2022.03.28 2052.03.28 3.13 % KRW 40,000 Corporate bond 2022.03.28 2025.03.28 3.24 % KRW 90,000 Korea Midland Power Co., Ltd. #65-1 non-guaranteedCorporate bond 2022.01.17 2032.01.17 2.85 % KRW 10,000 #65-2 non-guaranteedCorporate bond 2022.01.17 2042.01.17 2.83 % KRW 10,000 #66-1 non-guaranteedCorporate bond 2022.01.24 2025.01.24 2.83 % KRW 40,000 #66-2 non-guaranteedCorporate bond 2022.01.24 2027.01.24 2.95 % KRW 30,000 #66- 3 2022.01.24 2052.01.24 2.87 % KRW 50,000 #67 non-guaranteedCorporate bond 2022.02.17 2052.02.17 3.01 % KRW 40,000 #9 Foreign currencyCorporate bond 2022.04.21 2027.04.21 3.63 % USD 300,000 Korea Western Power Co., Ltd. #51-1 Corporate bond 2022.01.25 2025.01.24 2.76 % KRW 50,000 #51-2 Corporate bond 2022.01.25 2042.01.24 2.78 % KRW 20,000 #52-1 Corporate bond 2022.03.28 2025.03.28 3.18 % KRW 90,000 #52-2 Corporate bond 2022.03.28 2042.03.28 3.35 % KRW 30,000 #52-3 Corporate bond 2022.03.28 2052.03.28 3.20 % KRW 10,000 Korea Southern Power Co., Ltd. Corporate bond 2022.03.24 2025.03.24 3.13 % KRW 40,000 Corporate bond 2022.03.24 2042.03.24 3.29 % KRW 60,000 Corporate bond 2022.04.26 2025.04.26 3.63 % KRW 160,000 Corporate bond 2022.04.26 2025.04.26 3.63 % KRW 10,000 Corporate bond 2022.04.26 2052.04.26 3.60 % KRW 20,000 Korea East-West Power Co., Ltd. Corporate bond 2022.04.22 2025.04.22 3.75 % KRW 60,000 (2) The Company established the right of pledge on the shares of Jeju Hanlim Offshore Wind Co., Ltd. with other shareholders to procure project financing of Jeju Hanlim Offshore Wind Co., Ltd. which is a subsidiary of the Company on February 25, 2022. (3) The ongoing armed conflict between Russia and Ukraine in the territory of Ukraine, which started in February 2022, and relevant sanctions against Russia and Belarus imposed by the international community can impact not only sanctioned entities of Russia and Belarus but also the entities doing business directly or indirectly with Ukraine, Russia or Belarus and the entities exposed directly or indirectly to industries or economy of those countries. The Company has accounted for the event as a non-adjusting event after the reporting period. The Company is unable to make reasonable estimates of the future financial impact of the Ukraine-Russia conflict on the Company’s financial position or performance.

Reporting Entity (Description_3

Reporting Entity (Description of the controlling company) - Additional Information (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
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 services.
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, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of shareholders information [Line Items]
Number of shares	641,964,077	641,964,077	641,964,077
Percentage of ownership	100.00%
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	91,105,897
Percentage of ownership	14.19%
Other
Disclosure of shareholders information [Line Items]
Number of shares	222,781,122
Percentage of ownership	34.71%

Basis of Preparation - Addition

Basis of Preparation - Additional Information (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2021	Dec. 31, 2020
Unbilled Revenue [Member]
Disclosure Of Basis Of Preparation Of Financial Statements [Line Items]
Unbilled revenue recognized	₩ 1,725,444	₩ 1,691,294

Significant Accounting Polici_4

Significant Accounting Policies - Summary of Property, Plant and Equipment, Estimated Useful Lives (Details)	12 Months Ended
	Dec. 31, 2021
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, 2021
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, 2021
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
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
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

Significant Accounting Polici_7

Significant Accounting Policies - Additional Information (Details) - Investment properties [Member]	12 Months Ended
	Dec. 31, 2021
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, 2021
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, 2019, 2020 and 2021.

Segment, Geographic and Other_4

Segment, Geographic and Other Information - Summary of Operating Segments (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of operating segments [line items]
Total segment revenue	₩ 59,913,607	₩ 57,925,837	₩ 58,568,082
Intersegment revenue	0	0	0
Revenue from external customers	59,913,607	57,925,837	58,568,082
Depreciation and amortisation	11,938,272	11,548,019	11,128,740
Interest income	221,874	242,586	268,118
Interest expense	1,914,457	1,995,425	2,046,811
Employee benefit expense	511,942	492,288	725,120
Loss on abandonment of property, plant and equipment	207,934	255,346	364,233
Increase in provisions, net	2,466,452	1,832,765	2,301,215
Operating profit (loss)	(5,736,635)	4,096,620	(1,707,527)
Finance income	1,402,614	1,510,249	1,009,706
Finance expense	(3,245,777)	(2,896,443)	(2,782,156)
Profit (loss) related to associates and joint ventures	494,584	281,107	214,138
Profit (loss) before income tax	(7,085,214)	2,991,533	(3,265,838)
Segment assets	211,108,870	203,142,111
Investments in associates and joint ventures	7,471,384	6,170,533
Acquisition of non-current assets	12,781,634	13,401,665
Segment liabilities	145,797,021	132,475,265
Operating segments
Disclosure of operating segments [line items]
Profit (loss) related to associates and joint ventures	494,584	281,107	214,139
Segment assets	252,045,653	241,913,304
Investments in associates and joint ventures	7,471,384	6,170,533
Acquisition of non-current assets	12,793,635	13,432,396
Segment liabilities	148,745,359	133,818,362
Operating segments | Transmission and distribution
Disclosure of operating segments [line items]
Total segment revenue	58,999,388	57,345,933	58,328,372
Intersegment revenue	1,672,776	1,224,602	1,336,725
Revenue from external customers	57,326,612	56,121,331	56,991,647
Depreciation and amortisation	3,990,464	3,836,355	3,814,428
Interest income	36,831	48,220	73,478
Interest expense	678,986	737,973	777,120
Employee benefit expense	193,412	190,302	298,144
Loss on abandonment of property, plant and equipment	202,262	236,727	350,865
Increase in provisions, net	1,194,643	731,194	987,828
Operating profit (loss)	(7,244,319)	3,045,912	(2,568,529)
Profit (loss) related to associates and joint ventures	391,116	169,176	140,757
Segment assets	115,578,517	113,115,667
Investments in associates and joint ventures	4,700,863	4,204,090
Acquisition of non-current assets	6,754,298	6,535,380
Segment liabilities	68,531,927	59,772,046
Operating segments | Electric power generation (Nuclear)
Disclosure of operating segments [line items]
Total segment revenue	9,324,391	9,938,941	8,937,026
Intersegment revenue	9,207,516	9,817,147	8,908,803
Revenue from external customers	116,875	121,794	28,223
Depreciation and amortisation	3,611,594	3,564,120	3,227,695
Interest income	22,209	25,581	37,277
Interest expense	477,512	503,485	511,864
Employee benefit expense	86,730	86,672	132,283
Loss on abandonment of property, plant and equipment	0	0	0
Increase in provisions, net	680,358	691,052	672,134
Operating profit (loss)	762,164	1,168,833	782,511
Profit (loss) related to associates and joint ventures	(18,146)	(4,905)	(5,497)
Segment assets	64,628,651	61,850,865
Investments in associates and joint ventures	141,885	116,867
Acquisition of non-current assets	1,959,479	2,419,939
Segment liabilities	38,361,337	35,652,467
Operating segments | Electric power generation (Non-nuclear)
Disclosure of operating segments [line items]
Total segment revenue	25,837,982	20,329,611	24,254,957
Intersegment revenue	24,518,167	19,552,376	23,472,153
Revenue from external customers	1,319,815	777,235	782,804
Depreciation and amortisation	4,178,520	4,034,024	3,955,333
Interest income	22,226	20,843	35,626
Interest expense	624,391	622,346	655,466
Employee benefit expense	121,020	112,775	163,626
Loss on abandonment of property, plant and equipment	5,672	17,679	13,364
Increase in provisions, net	285,152	346,195	766,407
Operating profit (loss)	364,572	(172,884)	551,287
Profit (loss) related to associates and joint ventures	109,765	115,096	77,641
Segment assets	57,304,296	54,531,155
Investments in associates and joint ventures	2,575,019	1,807,409
Acquisition of non-current assets	3,331,813	3,758,795
Segment liabilities	35,803,289	33,292,680
Operating segments | Plant maintenance & engineering service
Disclosure of operating segments [line items]
Total segment revenue	2,805,785	2,703,472	2,627,539
Intersegment revenue	2,370,900	2,283,333	2,254,841
Revenue from external customers	434,885	420,139	372,698
Depreciation and amortisation	121,493	119,056	125,546
Interest income	9,515	11,789	14,214
Interest expense	933	1,250	2,861
Employee benefit expense	94,269	101,255	124,745
Loss on abandonment of property, plant and equipment	0	0	0
Increase in provisions, net	213,500	230,264	124,242
Operating profit (loss)	245,360	197,553	312,341
Profit (loss) related to associates and joint ventures	11,849	1,740	1,237
Segment assets	3,672,366	3,492,571
Investments in associates and joint ventures	53,617	42,167
Acquisition of non-current assets	110,330	141,226
Segment liabilities	1,086,926	1,061,949
Operating segments | Others
Disclosure of operating segments [line items]
Total segment revenue	2,010,843	1,582,001	1,049,324
Intersegment revenue	1,295,423	1,096,663	656,614
Revenue from external customers	715,420	485,338	392,710
Depreciation and amortisation	158,952	122,092	127,364
Interest income	158,680	167,005	141,262
Interest expense	162,345	162,843	134,248
Employee benefit expense	52,698	50,889	18,409
Loss on abandonment of property, plant and equipment	0	940	4
Increase in provisions, net	2,981	3,711	2,408
Operating profit (loss)	200,363	148,393	(489,585)
Profit (loss) related to associates and joint ventures	0	0	0
Segment assets	10,861,823	8,923,046
Investments in associates and joint ventures	0	0
Acquisition of non-current assets	637,715	577,056
Segment liabilities	4,961,880	4,039,220
Material reconciling items
Disclosure of operating segments [line items]
Total segment revenue	(39,064,782)	(33,974,121)	(36,629,136)
Intersegment revenue	(39,064,782)	(33,974,121)	(36,629,136)
Revenue from external customers	0	0	0
Depreciation and amortisation	(122,751)	(127,628)	(121,626)
Interest income	(27,587)	(30,852)	(33,739)
Interest expense	(29,710)	(32,472)	(34,748)
Employee benefit expense	(36,187)	(49,605)	(12,087)
Loss on abandonment of property, plant and equipment	0	0	0
Increase in provisions, net	89,818	(169,651)	(251,804)
Operating profit (loss)	(64,775)	(291,187)	(295,552)
Profit (loss) related to associates and joint ventures	0	0	₩ 0
Segment assets	(40,936,783)	(38,771,193)
Investments in associates and joint ventures	0	0
Acquisition of non-current assets	(12,001)	(30,731)
Segment liabilities	(2,948,338)	(1,343,097)
Elimination of intersegment amounts
Disclosure of operating segments [line items]
Segment assets	(41,701,400)	(39,762,888)
Investments in associates and joint ventures	0	0
Acquisition of non-current assets	(12,001)	(30,731)
Segment liabilities	(8,101,011)	(6,749,728)
Equity method adjustment
Disclosure of operating segments [line items]
Segment assets	1,866,554	1,372,001
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	1,881	47,664
Investments in associates and joint ventures	0	0
Acquisition of non-current assets	0	0
Segment liabilities	5,248,627	5,417,629
Others
Disclosure of operating segments [line items]
Segment assets	(1,103,818)	(427,970)
Investments in associates and joint ventures	0	0
Acquisition of non-current assets	0	0
Segment liabilities	₩ (95,954)	₩ (10,998)

Segment, Geographic and Other_5

Segment, Geographic and Other Information - Summary of Geographical Areas (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue
Total revenue from external customers (Notes 4, 35, 45, 47)		₩ 59,913,607	₩ 57,925,837	₩ 58,568,082
Non-current assets	[1]	182,318,491	176,505,403	172,110,120
Domestic
Revenue
Total revenue from external customers (Notes 4, 35, 45, 47)		58,672,484	56,774,578	56,942,128
Non-current assets	[1]	178,745,707	173,673,478	169,366,365
Overseas
Revenue
Total revenue from external customers (Notes 4, 35, 45, 47)	[2]	1,241,123	1,151,259	1,625,954
Non-current assets	[1],[2]	₩ 3,572,784	₩ 2,831,925	₩ 2,743,755
[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 assets. Since the overseas revenue or non-current assets attributable to particular countries are not material, they are not disclosed individually.

Classification of Financial I_3

Classification of Financial Instruments - Classification of Financial Assets (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of financial assets [line items]
Cash and cash equivalents	₩ 2,635,238	₩ 2,029,584	₩ 1,810,129	₩ 1,358,345
Categories of current financial assets
Current financial assets at fair value through profit or loss	360,833	1,196,101
Current financial assets at amortized costs	15,422	13,149
Current Derivative assets	126,938	29,525
Other financial assets	1,365,603	1,561,445
Trade and other receivables	8,122,415	7,918,470
Total current financial assets And Cash and cash equivalents	12,626,449	12,748,274
Categories of Non-current Financial assets
Non-current financial assets at fair value through profit or loss	672,031	685,281
Non-current financial assets at fair value through other comprehensive income	435,107	358,559
Non-current financial assets at amortized costs	9,851	1,273
Non-current Derivative assets	520,845	136,888
Other financial assets	1,271,976	1,290,820
Trade and other receivables	1,906,861	1,861,569
Total non-current financial assets	4,816,671	4,334,390
Total financial assets	17,443,120	17,082,664
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	360,833	1,196,101
Current financial assets at amortized costs	0	0
Current Derivative assets	93,374	18,332
Other financial assets	0	0
Trade and other receivables	0	0
Total current financial assets And Cash and cash equivalents	454,207	1,214,433
Categories of Non-current Financial assets
Non-current financial assets at fair value through profit or loss	672,031	685,281
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	349,653	92,432
Other financial assets	0	0
Trade and other receivables	0	0
Total non-current financial assets	1,021,684	777,713
Total financial assets	1,475,891	1,992,146
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	435,107	358,559
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	435,107	358,559
Total financial assets	435,107	358,559
Financial assets at amortized cost
Disclosure of financial assets [line items]
Cash and cash equivalents	2,635,238	2,029,584
Categories of current financial assets
Current financial assets at fair value through profit or loss	0	0
Current financial assets at amortized costs	15,422	13,149
Current Derivative assets	0	0
Other financial assets	1,365,603	1,561,445
Trade and other receivables	8,122,415	7,918,470
Total current financial assets And Cash and cash equivalents	12,138,678	11,522,648
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	9,851	1,273
Non-current Derivative assets	0	0
Other financial assets	1,271,976	1,290,820
Trade and other receivables	1,906,861	1,861,569
Total non-current financial assets	3,188,688	3,153,662
Total financial assets	15,327,366	14,676,310
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	33,564	11,193
Other financial assets	0	0
Trade and other receivables	0	0
Total current financial assets And Cash and cash equivalents	33,564	11,193
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	171,192	44,456
Other financial assets	0	0
Trade and other receivables	0	0
Total non-current financial assets	171,192	44,456
Total financial assets	₩ 204,756	₩ 55,649

Classification of Financial I_4

Classification of Financial Instruments - Classification of Financial Liabilities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2021	Dec. 31, 2020
Categories of current financial liabilities
Borrowings	₩ 4,382,218	₩ 2,113,181
Debt securities	9,647,616	8,561,624
Derivative liabilities	7,291	49,884
Trade and other payables	8,153,426	6,256,521
Total current financial liabilities	22,190,551	16,981,210
Categories of non-current financial liabilities
Borrowings	2,265,624	3,003,999
Debt securities	64,234,055	56,045,777
Derivative liabilities	70,740	315,235
Trade and other payables	5,996,498	6,480,412
Total non-current financial liabilities	72,566,917	65,845,423
Total financial liabilities	94,757,468	82,826,633
Financial liabilities at fair value through profit or loss
Categories of current financial liabilities
Borrowings	0	0
Debt securities	0	0
Derivative liabilities	6,838	13,053
Trade and other payables	0	0
Total current financial liabilities	6,838	13,053
Categories of non-current financial liabilities
Borrowings	0	0
Debt securities	0	0
Derivative liabilities	49,418	144,873
Trade and other payables	0	0
Total non-current financial liabilities	49,418	144,873
Total financial liabilities	56,256	157,926
Financial liabilities recognized at amortized cost
Categories of current financial liabilities
Borrowings	4,382,218	2,113,181
Debt securities	9,647,616	8,561,624
Derivative liabilities	0	0
Trade and other payables	8,153,426	6,256,521
Total current financial liabilities	22,183,260	16,931,326
Categories of non-current financial liabilities
Borrowings	2,265,624	3,003,999
Debt securities	64,234,055	56,045,777
Derivative liabilities	0	0
Trade and other payables	5,996,498	6,480,412
Total non-current financial liabilities	72,496,177	65,530,188
Total financial liabilities	94,679,437	82,461,514
Derivatives (applying hedge accounting)
Categories of current financial liabilities
Borrowings	0	0
Debt securities	0	0
Derivative liabilities	453	36,831
Trade and other payables	0	0
Total current financial liabilities	453	36,831
Categories of non-current financial liabilities
Borrowings	0	0
Debt securities	0	0
Derivative liabilities	21,322	170,362
Trade and other payables	0	0
Total non-current financial liabilities	21,322	170,362
Total financial liabilities	₩ 21,775	₩ 207,193

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, 2021	Dec. 31, 2020	Dec. 31, 2019
Income, expense, gains or losses of financial instruments
Dividends income	₩ 10,522	₩ 7,316	₩ 13,838
Gain (loss) on valuation of derivatives	822,994	(455,715)	317,350
Gain (loss) on valuation of financial assets	34,444	40,699
Interest expense of trade and other payables	213,765	88,757	94,019
Interest expense of others	384,423	540,867	558,464
Other finance income	1,284	1,470	0
Other finance expenses	4,058	4,456	2,555
Cash and Cash Equivalents
Income, expense, gains or losses of financial instruments
Interest income	12,692	9,419	42,861
Gain (loss) on foreign currency transactions and translations	34,923	(15,911)	(3,332)
Financial assets at fair value through profit or loss
Income, expense, gains or losses of financial instruments
Interest income	18,415	19,114	29,411
Dividends income	2,949	4,734	6,984
Gain (loss) on valuation of derivatives	450,896	(52,447)	151,604
Gain (loss) on transaction of derivatives	54,352	36,563	63,329
Gain (loss) on valuation of financial assets	8,858	5,508	1,062
Gain on disposal of financial assets	4,221	11,344	1,760
Financial assets at fair value through other comprehensive income
Income, expense, gains or losses of financial instruments
Dividends income	7,573	2,582	6,854
Financial assets at amortized cost
Income, expense, gains or losses of financial instruments
Interest income	797	612	539
Gain (loss) on foreign currency transactions and translations	(3,647)	(1,733)	(690)
Loans and receivables
Income, expense, gains or losses of financial instruments
Interest income	25,196	26,232	63,448
Gain (loss) on foreign currency transactions and translations	729	(527)	(631)
Trade and other receivables
Income, expense, gains or losses of financial instruments
Interest income	144,543	151,035	69,941
Gain on disposal of financial assets	2,452
Gain (loss) on foreign currency transactions and translations	14,207	23,458	(31,500)
Short-term financial instruments
Income, expense, gains or losses of financial instruments
Interest income	7,531	25,540	49,070
Gain (loss) on foreign currency transactions and translations	32,218	(38,088)	39,845
Long-term financial instruments
Income, expense, gains or losses of financial instruments
Interest income	12,470	10,406	12,794
Gain (loss) on foreign currency transactions and translations	27	0	0
Other financial assets
Income, expense, gains or losses of financial instruments
Interest income	230	228	54
Derivative (applying hedge accounting)
Income, expense, gains or losses of financial instruments
Gain (loss) on valuation of derivatives	211,180	(77,733)	123,730
Gain (loss) on transaction of derivatives	31,351	36,053	65,651
Gain (loss) on valuation of derivatives (equity, before tax)	(11,734)	9,925	38,305
Financial liabilities at fair value through profit or loss
Income, expense, gains or losses of financial instruments
Gain (loss) on valuation of derivatives	2,751	(104,607)	27,686
Gain (loss) on transaction of derivatives	(15,358)	(49,788)	(493)
Financial liabilities carried at amortized cost
Income, expense, gains or losses of financial instruments
Gain (loss) on repayment of financial liabilities	(10)	(35)	0
Gain (loss) on foreign currency transactions and translations	(1,162,835)	772,045	(409,867)
Interest expense of borrowings and debt securities	1,316,269	1,365,801	1,394,328
Interest expense of trade and other payables	213,765	88,757	94,019
Interest expense of others	384,423	540,867	558,464
Other finance income	1,284	0	0
Other finance expenses	2,504	0	0
Derivatives (applying hedge accounting)
Income, expense, gains or losses of financial instruments
Gain (loss) on valuation of derivatives	158,167	(220,928)	14,330
Gain (loss) on transaction of derivatives	13,737	42,565	(42,072)
Gain (loss) on valuation of derivatives (equity, before tax)	₩ (28,726)	₩ 101,295	₩ (2,578)

Restricted Deposits - Summary o

Restricted Deposits - Summary of Restricted Deposits (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2021	Dec. 31, 2020
Restricted Deposits [Line Items]
Total Restricted Deposits		₩ 1,288,589	₩ 1,295,758
Cash and Cash Equivalents
Restricted Deposits [Line Items]
Escrow accounts		0	544
Deposits for government project		22,286	5,066
Collateral provided for borrowings		264,813	117,747
Collateral provided for lawsuit		42	42
Deposits for transmission regional support program		5,921	5,469
Deposits for Other Business Purposes		3,050
Short-term financial instruments
Restricted Deposits [Line Items]
Collateral provided for borrowings		11,745
Restriction on withdrawal related to 'win-win growth program' for small and medium enterprises		114,000	109,000
Non-Current financial assets at fair value through profit or loss
Restricted Deposits [Line Items]
Decommissioning costs of nuclear power plants		531,720	577,481
Long-term financial instruments
Restricted Deposits [Line Items]
Escrow accounts		70	76
Collateral provided for borrowings		0	11,745
Decommissioning costs of nuclear power plants		324,609	258,282
Guarantee deposits for banking accounts at oversea branches		333	306
Funds for developing small and medium enterprises	[1]	₩ 10,000	₩ 210,000
[1]	As of December 31, 2020, it consisted of the deposits for small and medium enterprises at the Industrial Bank of Korea (IBK) and others for construction of Bitgaram Energy Valley and support for high potential businesses amounting to ￦200,000 million and the deposits were returned during the year ended December 31, 2021.

Restricted Deposits - Summary_2

Restricted Deposits - Summary of Restricted Deposits (Parentheticals) (Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2021KRW (₩)
Restricted Deposits [Abstract]
Restricted Funds For Developing Small And Medium Enterprises Returned During Period	₩ 200,000

Cash and Cash Equivalents - Sum

Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash and cash equivalents [abstract]
Total cash	₩ 19,623	₩ 871
Demand Deposit Accounts	1,825,751	1,291,058
Short-term deposits, classified as cash equivalents	407,921	432,263
Short-term investments, classified as cash equivalents	381,943	305,392
Total cash and cash equivalents	₩ 2,635,238	₩ 2,029,584	₩ 1,810,129	₩ 1,358,345

Trade and Other Receivables - T

Trade and Other Receivables - Trade and Other Receivables (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2021		Dec. 31, 2020
Trade and Other Receivables [Line Items]
Gross amount	₩ 10,324,255		₩ 10,126,268
Allowance for doubtful accounts	(288,049)		(341,369)
Present value discount	(6,930)		(4,860)
Trade and other receivables	10,029,276		9,780,039
Other receivables
Trade and Other Receivables [Line Items]
Gross amount	2,395,008		2,528,084
Allowance for doubtful accounts	(82,710)		(132,379)
Present value discount	(6,930)		(4,860)
Trade and other receivables	2,305,368		2,390,845
Current assets
Trade and Other Receivables [Line Items]
Gross amount	8,345,848		8,170,521
Allowance for doubtful accounts	(222,393)		(250,516)
Present value discount	(1,040)		(1,535)
Trade and other receivables	8,122,415		7,918,470
Current assets | Trade receivables
Trade and Other Receivables [Line Items]
Gross amount	7,743,735		7,370,923
Allowance for doubtful accounts	(203,838)		(208,184)
Present value discount	0		0
Trade and other receivables	7,539,897		7,162,739
Current assets | Other receivables
Trade and Other Receivables [Line Items]
Gross amount	602,113		799,598
Allowance for doubtful accounts	(18,555)		(42,332)
Present value discount	(1,040)		(1,535)
Trade and other receivables	582,518		755,731
Current assets | Non-trade receivables
Trade and Other Receivables [Line Items]
Gross amount	232,172		441,031
Allowance for doubtful accounts	(17,084)		(37,062)
Present value discount	(9)		0
Trade and other receivables	215,079		403,969
Current assets | Accrued income
Trade and Other Receivables [Line Items]
Gross amount	57,300		38,956
Allowance for doubtful accounts	0		0
Present value discount	0		0
Trade and other receivables	57,300		38,956
Current assets | Deposits
Trade and Other Receivables [Line Items]
Gross amount	212,666		239,011
Allowance for doubtful accounts	0		0
Present value discount	(1,031)		(1,535)
Trade and other receivables	211,635		237,476
Current assets | Finance lease receivables
Trade and Other Receivables [Line Items]
Gross amount	60,613	[1]	57,084	[2]
Allowance for doubtful accounts	(178)	[1]	(365)	[2]
Present value discount	0	[1]	0	[2]
Trade and other receivables	60,435	[1]	56,719	[2]
Current assets | Others
Trade and Other Receivables [Line Items]
Gross amount	39,362		23,516
Allowance for doubtful accounts	(1,293)		(4,905)
Present value discount	0		0
Trade and other receivables	38,069		18,611
Non-current assets
Trade and Other Receivables [Line Items]
Gross amount	1,978,407		1,955,747
Allowance for doubtful accounts	(65,656)		(90,853)
Present value discount	(5,890)		(3,325)
Trade and other receivables	1,906,861		1,861,569
Non-current assets | Trade receivables
Trade and Other Receivables [Line Items]
Gross amount	185,512		227,261
Allowance for doubtful accounts	(1,501)		(806)
Present value discount	0		0
Trade and other receivables	184,011		226,455
Non-current assets | Other receivables
Trade and Other Receivables [Line Items]
Gross amount	1,792,895		1,728,486
Allowance for doubtful accounts	(64,155)		(90,047)
Present value discount	(5,890)		(3,325)
Trade and other receivables	1,722,850		1,635,114
Non-current assets | Non-trade receivables
Trade and Other Receivables [Line Items]
Gross amount	123,537		215,136
Allowance for doubtful accounts	(56,407)		(80,451)
Present value discount	(281)		0
Trade and other receivables	66,849		134,685
Non-current assets | Accrued income
Trade and Other Receivables [Line Items]
Gross amount	1,828		834
Allowance for doubtful accounts	0		0
Present value discount	0		0
Trade and other receivables	1,828		834
Non-current assets | Deposits
Trade and Other Receivables [Line Items]
Gross amount	441,393		364,855
Allowance for doubtful accounts	0		0
Present value discount	(5,609)		(3,325)
Trade and other receivables	435,784		361,530
Non-current assets | Finance lease receivables
Trade and Other Receivables [Line Items]
Gross amount	1,140,080	[3]	1,065,982	[2],[4]
Allowance for doubtful accounts	(590)	[3]	(625)	[2],[4]
Present value discount	0	[3]	0	[2],[4]
Trade and other receivables	1,139,490	[3]	1,065,357	[2],[4]
Non-current assets | Others
Trade and Other Receivables [Line Items]
Gross amount	86,057		81,679
Allowance for doubtful accounts	(7,158)		(8,971)
Present value discount	0		0
Trade and other receivables	₩ 78,899		₩ 72,708
[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 ￦105,127 million.
[3]	Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of ￦1,082,712 million.
[4]	Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of ￦1,087,559 million.

Trade and Other Receivables -_2

Trade and Other Receivables - Trade and Other Receivables (Parenthetical) (Details) - Finance lease receivables - KRW (₩) ₩ in Millions	Dec. 31, 2021	Dec. 31, 2020
Current assets
Trade and Other Receivables [Line Items]
Unearned finance income relating to finance lease payments receivable	₩ 111,915	₩ 105,127
Non-current assets
Trade and Other Receivables [Line Items]
Unearned finance income relating to finance lease payments receivable	₩ 1,082,712	₩ 1,087,559

Trade and Other Receivables - O

Trade and Other Receivables - Other Receivables (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2021	Dec. 31, 2020
Gross amount
Trade and Other Receivables [Line Items]
Trade receivables Face value	₩ 7,929,247	₩ 7,598,184
Trade receivables Allowance for doubtful accounts	(205,339)	(208,990)
Trade receivables	7,723,908	7,389,194
Other receivables Face value	2,395,008	2,528,084
Other receivables Allowance for doubtful accounts	(82,710)	(132,379)
Other receivables Present value discount	(6,930)	(4,860)
Other receivables	2,305,368	2,390,845
Current
Trade and Other Receivables [Line Items]
Trade receivables Face value	7,603,472	7,274,773
Other receivables Face value	2,251,474	2,363,967
Trade and Other receivables: (impairment reviewed)
Trade and Other Receivables [Line Items]
Trade receivables Face value	325,775	323,411
Other receivables Face value	143,534	164,117
Less than 60 days
Trade and Other Receivables [Line Items]
Trade receivables Face value	11,577	3,505
Other receivables Face value	87	46,399
60 ~ 90 days
Trade and Other Receivables [Line Items]
Trade receivables Face value	27,201	28,729
Other receivables Face value	4,881	31,183
90 ~ 120 days
Trade and Other Receivables [Line Items]
Trade receivables Face value	28,230	10,687
Other receivables Face value	1,248	1,873
120 days ~ 1year
Trade and Other Receivables [Line Items]
Trade receivables Face value	51,945	34,036
Other receivables Face value	11,438	11,803
Over 1 year
Trade and Other Receivables [Line Items]
Trade receivables Face value	206,822	246,454
Other receivables Face value	₩ 125,880	₩ 72,859

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, 2021	Dec. 31, 2020	Dec. 31, 2019
Trade receivables
Reconciliation of changes in allowance account for credit losses of financial assets [Line Items]
Beginning balance	₩ 208,990	₩ 212,759	₩ 215,868
Changes in allowance account for credit losses of financial assets
Bad debt expense	19,039	24,021	29,221
Write-off	(21,809)	(20,332)	(10,106)
Reversal	(1,071)	(3,373)	(41,940)
Others	190	(4,085)	19,716
Ending balance	205,339	208,990	212,759
Other receivables
Reconciliation of changes in allowance account for credit losses of financial assets [Line Items]
Beginning balance	132,379	114,155	104,726
Changes in allowance account for credit losses of financial assets
Bad debt expense	18,411	27,329	19,206
Write-off	(58,762)	(1,910)	(1,146)
Reversal	(79)	(2,464)	0
Others	(9,239)	(4,731)	(8,631)
Ending balance	₩ 82,710	₩ 132,379	₩ 114,155

Trade and Other Receivables -

Trade and Other Receivables - Additional Information (Details)	Dec. 31, 2021
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, 2021	Dec. 31, 2020
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Current financial assets at fair value through profit or loss		₩ 360,833	₩ 1,196,101
Non-current financial assets at fair value through profit or loss		672,031	685,281
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		360,833	1,196,101
Non-current financial assets at fair value through profit or loss		413,960	473,215
Financial assets at fair value through profit or loss | Beneficiary securities
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Current financial assets at fair value through profit or loss		629	1,313
Non-current financial assets at fair value through profit or loss		206,160	155,122
Financial assets at fair value through profit or loss | Cooperative securities
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		5,797	5,692
Financial assets at fair value through profit or loss | Other
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Current financial assets at fair value through profit or loss	[1]	360,204	1,194,788
Non-current financial assets at fair value through profit or loss	[1]	202,003	312,401
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		₩ 258,071	₩ 212,066
[1]	‘Other’ includes MMT, 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, 2021	Dec. 31, 2020
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Gains (losses) on financial assets at fair value through profit or loss	₩ 34,444	₩ 40,699
Financial assets at fair value through profit or loss | Beneficiary securities
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Gains (losses) on financial assets at fair value through profit or loss	13,632	6,127
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	110	645
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	854	3,598
Financial assets at fair value through profit or loss | Other
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Gains (losses) on financial assets at fair value through profit or loss	₩ 19,848	₩ 30,329

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, 2021		Dec. 31, 2020
Changes in financial assets at fair value through other comprehensive income [Line Items]
Beginning balance	[1]	₩ 358,559
Acquisition		10,929
Disposal		(8,221)
Valuation		68,777
Others		5,063
Ending Balance		435,107		₩ 358,559	[1]
Listed equity securities
Changes in financial assets at fair value through other comprehensive income [Line Items]
Beginning balance		194,669		201,201
Acquisition		1,500		0
Disposal		(8,208)		(4)
Valuation		81,112		(7,809)
Others		4,753		1,281
Ending Balance		273,826		194,669
Unlisted equity securities
Changes in financial assets at fair value through other comprehensive income [Line Items]
Beginning balance		163,890	[1]	177,969
Acquisition		8,929		2,900
Disposal		(13)		(1)
Valuation		(12,335)		(23,128)
Others		319		6,150
Ending Balance	[1]	160,790		163,890
Corporate Bond
Changes in financial assets at fair value through other comprehensive income [Line Items]
Beginning balance		0
Acquisition		500
Disposal		0
Valuation		0
Others		(9)
Ending Balance		491		0
Listed and unlisted equity securties
Changes in financial assets at fair value through other comprehensive income [Line Items]
Beginning balance		358,559		379,170
Acquisition		10,429		2,900
Disposal		(8,221)		(5)
Valuation		68,777		(30,937)
Others		5,072		7,431
Ending Balance		434,616		358,559
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		358,559		379,170
Acquisition		10,929		2,900
Disposal		(8,221)		(5)
Valuation		68,777		(30,937)
Others		5,063		7,431
Ending Balance		₩ 435,107		₩ 358,559
[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, 2021		Dec. 31, 2020		Dec. 31, 2019
Financial assets at fair value through other comprehensive income [Line Items]
Acquisition Cost		₩ 589,194		₩ 634,823	[1]
Book value		435,107		358,559	[1]
Fair value		435,107		358,559	[1]
Listed equity securities
Financial assets at fair value through other comprehensive income [Line Items]
Acquisition Cost		324,790		359,327
Book value		273,826		194,669		₩ 201,201
Fair value		₩ 273,826		₩ 194,669
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		87,733		91,356
Fair value		₩ 87,733		₩ 91,356
Ssangyong Motor Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		38,568		38,568
Ownership		0.03%		0.03%
Acquisition Cost		₩ 428		₩ 428
Book value		0		107
Fair value		₩ 0		₩ 107
SM Korea Line Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		180		180
Ownership		0.00%		0.00%
Acquisition Cost		₩ 1		₩ 1
Book value		0		1
Fair value		₩ 0		₩ 1
Namkwang Engineering & Construction Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		121		121
Ownership		0.00%		0.00%
Acquisition Cost		₩ 15		₩ 15
Book value		1		1
Fair value		₩ 1		₩ 1
Bumyang Construction Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		35		35
Ownership		0.00%		0.00%
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		42		49
Fair value		₩ 42		₩ 49
Pan Ocean Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		1,492		1,492
Ownership		0.00%		0.00%
Acquisition Cost		₩ 14		₩ 14
Book value		8		7
Fair value		₩ 8		₩ 7
Dongbu Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares				955
Ownership				0.02%
Acquisition Cost				₩ 12
Book value				13
Fair value				₩ 13
KSP Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares				22,539
Ownership				0.08%
Acquisition Cost				₩ 53
Book value				34
Fair value				₩ 34
STX Heavy Industries Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		7,419		7,419
Ownership		0.03%		0.12%
Acquisition Cost		₩ 107		₩ 107
Book value		35		29
Fair value		₩ 35		₩ 29
Codes Combine Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		291		291
Ownership		0.00%		0.00%
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		89,747		53,127
Fair value		₩ 89,747		₩ 53,127
Energy Fuels Inc.
Financial assets at fair value through other comprehensive income [Line Items]
Shares				1,711,814
Ownership				1.31%
Acquisition Cost				₩ 16,819
Book value				7,888
Fair value				₩ 7,888
Bunji Corporation Limited
Financial assets at fair value through other comprehensive income [Line Items]
Shares				99,763
Ownership				0.07%
Acquisition Cost				₩ 18,445
Book value				0
Fair value				₩ 0
Denison Mines Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		58,284,000		58,284,000
Ownership		9.76%		9.76%
Acquisition Cost		₩ 84,134		₩ 84,134
Book value		94,376		41,776
Fair value		₩ 94,376		₩ 41,776
Fission 3.0
Financial assets at fair value through other comprehensive income [Line Items]
Shares				75,000
Ownership				0.05%
Acquisition Cost				₩ 0
Book value				6
Fair value				₩ 6
Fission Uranium Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		100,000		800,000
Ownership		0.02%		0.16%
Acquisition Cost		₩ 41		₩ 785
Book value		73		266
Fair value		₩ 73		₩ 266
SangSangin Industry Co., Ltd.(formerly, DMC Co., Ltd.)
Financial assets at fair value through other comprehensive income [Line Items]
Shares		5,831		5,831
Ownership		0.01%		0.02%
Acquisition Cost		₩ 38		₩ 38
Book value		6		4
Fair value		₩ 6		₩ 4
Vitzosys Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		399		399
Ownership		0.00%		0.00%	[1]
Acquisition Cost		₩ 2		₩ 2
Book value		2		2
Fair value		₩ 2		₩ 2
EMnI Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		628		1,257
Ownership		0.00%		0.00%
Acquisition Cost		₩ 25		₩ 25
Book value		2		2
Fair value		₩ 2		2
Ihsung CNI Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares		142,860
Ownership		4.81%
Acquisition Cost		₩ 1,500
Book value		1,779
Fair value		₩ 1,779
Vissem electronics, Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares		229
Ownership		0.00%
Acquisition Cost		₩ 11
Book value		2
Fair value		₩ 2
KC Industry Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares		139
Ownership		0.00%
Acquisition Cost		₩ 6
Book value		1
Fair value		₩ 1
Aone Alform Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares		2,672
Ownership		0.08%
Acquisition Cost		₩ 19
Book value		18
Fair value		18
Unlisted equity securities
Financial assets at fair value through other comprehensive income [Line Items]
Acquisition Cost	[1]	263,904		275,496
Book value		160,790	[1]	163,890	[1]	₩ 177,969
Fair value	[1]	₩ 160,790		₩ 163,890
Intellectual Discovery, Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,000,000		1,000,000
Ownership	[1]	6.00%		6.00%
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]	0.00%		0.00%
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		₩ 15
Book value	[1]	29		15
Fair value	[1]	₩ 29		₩ 15
KC Development Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			839
Ownership	[1]			0.02%
Acquisition Cost	[1]			₩ 6
Book value	[1]			6
Fair value	[1]			₩ 6
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		34,846
Ownership	[1]	1.34%		1.34%
Acquisition Cost	[1]	₩ 697		₩ 697
Book value	[1]	69		69
Fair value	[1]	₩ 69		₩ 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		218
Ownership	[1]	0.07%		0.07%
Acquisition Cost	[1]	₩ 2		₩ 2
Book value	[1]	2		2
Fair value	[1]	₩ 2		₩ 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]	₩ 9		₩ 9
Book value	[1]	9		9
Fair value	[1]	₩ 9		₩ 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		2,512
Ownership	[1]	0.25%		0.25%
Acquisition Cost	[1]	₩ 255		₩ 126
Book value	[1]	150		21
Fair value	[1]	₩ 150		₩ 21
Buyoung Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	270		270
Ownership	[1]	0.00%		0.00%
Acquisition Cost	[1]	₩ 3		₩ 3
Book value	[1]	3		3
Fair value	[1]	₩ 3		₩ 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
Dongyang Telecom Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			1,760
Ownership	[1]			0.01%
Acquisition Cost	[1]			₩ 11
Book value	[1]			1
Fair value	[1]			₩ 1
Jongwon Remicon Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			31
Ownership	[1]			0.18%
Acquisition Cost	[1]			₩ 13
Book value	[1]			13
Fair value	[1]			₩ 13
Zyle Daewoo Motor Sales Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	22		22
Ownership	[1]	0.00%		0.00%
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]	0.00%		0.00%
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]	27		27
Fair value	[1]	₩ 27		₩ 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]	₩ 111		₩ 111
Book value	[1]	2		3
Fair value	[1]	₩ 2		₩ 3
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
Shinil Engineering Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			887
Ownership	[1]			0.06%
Acquisition Cost	[1]			₩ 3
Book value	[1]			3
Fair value	[1]			₩ 3
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]	0.00%		0.00%
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
Kolmar Pharma Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			1,426
Ownership	[1]			0.01%
Acquisition Cost	[1]			₩ 52
Book value	[1]			3
Fair value	[1]			₩ 3
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]	0.00%		0.00%
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]	0.00%		0.00%
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		3,130
Ownership	[1]	1.08%		1.08%
Acquisition Cost	[1]	₩ 219		₩ 219
Book value	[1]	59		59
Fair value	[1]	₩ 59		₩ 59
Dung Hwan Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	556		556
Ownership	[1]	0.02%		0.02%
Acquisition Cost	[1]	₩ 6		₩ 6
Book value	[1]	6		6
Fair value	[1]	₩ 6		₩ 6
Hurim Biocell Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,021		1,021
Ownership	[1]	0.00%		0.00%
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		25
Fair value	[1]	₩ 1		₩ 25
Haspe Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	652		652
Ownership	[1]	0.55%		0.55%
Acquisition Cost	[1]	₩ 20		₩ 20
Book value	[1]	20		20
Fair value	[1]	₩ 20		₩ 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
Dong Yang Metal Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			2,951
Ownership	[1]			1.97%
Acquisition Cost	[1]			₩ 161
Book value	[1]			147
Fair value	[1]			₩ 147
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		339
Ownership	[1]	1.12%		1.12%
Acquisition Cost	[1]	₩ 17		₩ 17
Book value	[1]	17		17
Fair value	[1]	₩ 17		₩ 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
Tae Hyung Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			28
Ownership	[1]			0.43%
Acquisition Cost	[1]			₩ 20
Book value	[1]			20
Fair value	[1]			₩ 20
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
Hankook Precision Ind Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			110
Ownership	[1]			0.06%
Acquisition Cost	[1]			₩ 3
Book value	[1]			3
Fair value	[1]			₩ 3
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]	0.00%		0.00%
Acquisition Cost	[1]	₩ 0		₩ 0
Book value	[1]	0		0
Fair value	[1]	₩ 0		₩ 0
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
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]	0.00%		0.00%
Acquisition Cost	[1]	₩ 6		₩ 6
Book value	[1]	0		6
Fair value	[1]	₩ 0		₩ 6
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]	0.00%		0.00%
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
Shin kwang Industrial Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			884
Ownership	[1]			0.35%
Acquisition Cost	[1]			₩ 55
Book value	[1]			55
Fair value	[1]			₩ 55
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		157
Ownership	[1]	0.37%		0.37%
Acquisition Cost	[1]	₩ 16		₩ 16
Book value	[1]	16		16
Fair value	[1]	₩ 16		₩ 16
Pyung Hwa Industrial Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	3,388		3,388
Ownership	[1]	3.00%		3.00%
Acquisition Cost	[1]	₩ 85		₩ 85
Book value	[1]	85		85
Fair value	[1]	₩ 85		₩ 85
PT. Kedap Sayaaq
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			671
Ownership	[1]			10.00%
Acquisition Cost	[1]			₩ 18,540
Book value	[1]			0
Fair value	[1]			₩ 0
Set Holding
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1],[2]	1,100,220		1,100,220
Ownership	[1],[2]	2.50%		2.50%
Acquisition Cost	[1],[2]	₩ 229,255		₩ 229,255
Book value	[1],[2]	131,036		143,765
Fair value	[1],[2]	₩ 131,036		₩ 143,765
PT. Cirebon Energi Prasarana
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	22,420		22,420
Ownership	[1]	10.00%		10.00%
Acquisition Cost	[1]	₩ 2,612		₩ 2,612
Book value	[1]	2,658		2,440
Fair value	[1]	₩ 2,658		₩ 2,440
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		159
Fair value	[1]	₩ 13		₩ 159
Sungsan Parts Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			629
Ownership	[1]			0.80%
Acquisition Cost	[1]			₩ 63
Book value	[1]			63
Fair value	[1]			₩ 63
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]	₩ 16		₩ 17
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
Yeong-gwang Remicon Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			15
Ownership	[1]			0.12%
Acquisition Cost	[1]			₩ 2
Book value	[1]			2
Fair value	[1]			₩ 2
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 corporation
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		100
Fair value	[1]	₩ 32		₩ 100
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]	617		617
Ownership	[1]	0.55%		0.55%
Acquisition Cost	[1]	₩ 46		₩ 46
Book value	[1]	46		46
Fair value	[1]	₩ 46		₩ 46
Doosung Heavy Industries Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	53		53
Ownership	[1]	0.06%		0.06%
Acquisition Cost	[1]	₩ 5		₩ 5
Book value	[1]	5		5
Fair value	[1]	₩ 5		₩ 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		213
Ownership	[1]	0.54%		0.54%
Acquisition Cost	[1]	₩ 21		₩ 21
Book value	[1]	21		21
Fair value	[1]	₩ 21		₩ 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]	60		60
Fair value	[1]	₩ 60		₩ 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
Keum Mun Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			1,320
Ownership	[1]			0.97%
Acquisition Cost	[1]			₩ 330
Book value	[1]			56
Fair value	[1]			₩ 56
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
SIE Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			12
Ownership	[1]			0.02%
Acquisition Cost	[1]			₩ 1
Book value	[1]			1
Fair value	[1]			₩ 1
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		182
Ownership	[1]	1.50%		1.50%
Acquisition Cost	[1]	₩ 73		₩ 73
Book value	[1]	73		73
Fair value	[1]	₩ 73		₩ 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]	81		81
Fair value	[1]	₩ 81		₩ 81
Wongwang Door Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	575		575
Ownership	[1]	1.00%		1.00%
Acquisition Cost	[1]	₩ 29		₩ 29
Book value	[1]	29		29
Fair value	[1]	₩ 29		₩ 29
Seobu Highway Solar Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			19,460
Ownership	[1]			2.86%
Acquisition Cost	[1]			₩ 195
Book value	[1]			195
Fair value	[1]			₩ 195
Dongbu Highway Solar Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			19,020
Ownership	[1]			4.99%
Acquisition Cost	[1]			₩ 190
Book value	[1]			190
Fair value	[1]			₩ 190
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]	0.00%		0.00%
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		299
Ownership	[1]	1.66%		1.66%
Acquisition Cost	[1]	₩ 44		₩ 44
Book value	[1]	44		44
Fair value	[1]	₩ 44		₩ 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]	₩ 10		₩ 10
Book value	[1]	10		10
Fair value	[1]	₩ 10		₩ 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]	55		55
Fair value	[1]	₩ 55		₩ 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]	0.00%		0.00%
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		₩ 2
Book value	[1]	9		2
Fair value	[1]	₩ 9		₩ 2
Daechang HRSG Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			618
Ownership	[1]			0.12%
Acquisition Cost	[1]			₩ 62
Book value	[1]			62
Fair value	[1]			₩ 62
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
Daewoon Shell Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			666
Ownership	[1]			2.81%
Acquisition Cost	[1]			₩ 33
Book value	[1]			33
Fair value	[1]			₩ 33
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
Daedong Millennium Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	159		159
Ownership	[1]	0.42%		0.42%
Acquisition Cost	[1]	₩ 32		₩ 32
Book value	[1]	32		32
Fair value	[1]	₩ 32		₩ 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
Cheong Hae Myeong Ga Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			1,867
Ownership	[1]			0.11%
Acquisition Cost	[1]			₩ 5
Book value	[1]			5
Fair value	[1]			₩ 5
Jaein Circuit Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	498		498
Ownership	[1]	1.12%		1.12%
Acquisition Cost	[1]	₩ 65		₩ 65
Book value	[1]	65		65
Fair value	[1]	₩ 65		₩ 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
Shinwonn 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		83
Fair value	[1]	₩ 6		₩ 83
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]	0.00%		0.00%
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]	0.00%		0.00%
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
Enaindustry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			201
Ownership	[1]			0.28%
Acquisition Cost	[1]			₩ 141
Book value	[1]			141
Fair value	[1]			₩ 141
TCT Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			3,277
Ownership	[1]			0.55%
Acquisition Cost	[1]			₩ 82
Book value	[1]			82
Fair value	[1]			₩ 82
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		1,013
Ownership	[1]	0.20%		0.20%
Acquisition Cost	[1]	₩ 51		₩ 51
Book value	[1]	51		51
Fair value	[1]	₩ 51		₩ 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]	0.00%		0.00%
Acquisition Cost	[1]	₩ 0		₩ 0
Book value	[1]	0		0
Fair value	[1]	₩ 0		₩ 0
Sung Ae Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			190
Ownership	[1]			0.80%
Acquisition Cost	[1]			₩ 10
Book value	[1]			10
Fair value	[1]			₩ 10
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		200
Ownership	[1]	0.04%		0.04%
Acquisition Cost	[1]	₩ 100		₩ 100
Book value	[1]	100		100
Fair value	[1]	₩ 100		₩ 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		505
Ownership	[1]	0.07%		0.07%
Acquisition Cost	[1]	₩ 51		₩ 51
Book value	[1]	51		51
Fair value	[1]	₩ 51		₩ 51
TM Construction co. Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	4		4
Ownership	[1]	0.00%		0.00%
Acquisition Cost	[1]	₩ 0		₩ 0
Book value	[1]	0		0
Fair value	[1]	₩ 0		₩ 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
HIC Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			7,408
Ownership	[1]			0.71%
Acquisition Cost	[1]			₩ 111
Book value	[1]			111
Fair value	[1]			₩ 111
Addies Direct Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1		1
Ownership	[1]	0.00%		0.00%
Acquisition Cost	[1]	₩ 0		₩ 0
Book value	[1]	0		0
Fair value	[1]	₩ 0		₩ 0
World CnM 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
Deok-u Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			1,626
Ownership	[1]			1.92%
Acquisition Cost	[1]			₩ 195
Book value	[1]			195
Fair value	[1]			₩ 195
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
Dongjin Foundry Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			966
Ownership	[1]			4.10%
Acquisition Cost	[1]			₩ 193
Book value	[1]			193
Fair value	[1]			₩ 193
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
Sungdo Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			130
Ownership	[1]			1.10%
Acquisition Cost	[1]			₩ 52
Book value	[1]			52
Fair value	[1]			₩ 52
KSM Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			25
Ownership	[1]			0.11%
Acquisition Cost	[1]			₩ 1
Book value	[1]			1
Fair value	[1]			₩ 1
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		39
Ownership	[1]	0.13%		0.13%
Acquisition Cost	[1]	₩ 14		₩ 14
Book value	[1]	14		14
Fair value	[1]	₩ 14		₩ 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
Sungshin Parts Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			345
Ownership	[1]			0.40%
Acquisition Cost	[1]			₩ 14
Book value	[1]			14
Fair value	[1]			₩ 14
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 Co., Ltd.
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
Koomin Precisions Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			124
Ownership	[1]			0.26%
Acquisition Cost	[1]			₩ 12
Book value	[1]			12
Fair value	[1]			₩ 12
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]	₩ 0		₩ 1
Book value	[1]	0		1
Fair value	[1]	₩ 0		₩ 1
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		36,645
Ownership	[1]	11.72%		11.72%
Acquisition Cost	[1]	₩ 1,832		₩ 1,832
Book value	[1]	1,832		1,832
Fair value	[1]	₩ 1,832		₩ 1,832
Kuklim Plastic New Technology Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			393
Ownership	[1]			0.29%
Acquisition Cost	[1]			₩ 8
Book value	[1]			8
Fair value	[1]			₩ 8
Dukeong Metal Heat Treatment Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	843		843
Ownership	[1]	3.61%		3.61%
Acquisition Cost	[1]	₩ 84		₩ 84
Book value	[1]	84		84
Fair value	[1]	₩ 84		₩ 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		16
Ownership	[1]	0.11%		0.11%
Acquisition Cost	[1]	₩ 1		₩ 1
Book value	[1]	1		1
Fair value	[1]	₩ 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
Newclean Livestock Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			86
Ownership	[1]			0.17%
Acquisition Cost	[1]			₩ 4
Book value	[1]			4
Fair value	[1]			₩ 4
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]			58
Ownership	[1]			0.14%
Acquisition Cost	[1]			₩ 9
Book value	[1]			9
Fair value	[1]			₩ 9
Team Korea Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	4,782		4,782
Ownership	[1]	0.37%		0.37%
Acquisition Cost	[1]	₩ 24		₩ 24
Book value	[1]	24		24
Fair value	[1]	₩ 24		₩ 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
Para Belleza Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			1,211
Ownership	[1]			1.74%
Acquisition Cost	[1]			₩ 74
Book value	[1]			74
Fair value	[1]			₩ 74
Dongsung Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]			1,983
Ownership	[1]			1.63%
Acquisition Cost	[1]			₩ 198
Book value	[1]			198
Fair value	[1]			₩ 198
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		4
Fair value	[1]	₩ 1		₩ 4
SH Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	39		31
Ownership	[1]	0.20%		0.20%
Acquisition Cost	[1]	₩ 8		₩ 6
Book value	[1]	8		6
Fair value	[1]	₩ 8		₩ 6
Namsunnam Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,275		1,275
Ownership	[1]	0.19%		0.19%
Acquisition Cost	[1]	₩ 6		₩ 6
Book value	[1]	1		6
Fair value	[1]	₩ 1		₩ 6
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		37
Fair value	[1]	₩ 4		₩ 37
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]	0.00%		0.00%
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		82
Fair value	[1]	₩ 10		₩ 82
SGC Energy Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	580,000		580,000
Ownership	[1]	5.00%		5.00%
Acquisition Cost	[1]	₩ 2,900		₩ 2,900
Book value	[1]	2,900		2,900
Fair value	[1]	₩ 2,900		₩ 2,900
H Robotics Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	903,601		9,192
Ownership	[1]	8.05%		4.55%
Acquisition Cost	[1]	₩ 4,000		₩ 1,000
Book value	[1]	5,639		1,000
Fair value	[1]	₩ 5,639		₩ 1,000
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]	457		500
Fair value	[1]	₩ 457		₩ 500
Le Soleil KHNP LLC
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	137,600
Ownership	[1]	19.00%
Acquisition Cost	[1]	₩ 1,376
Book value	[1]	1,376
Fair value	[1]	₩ 1,376
Ihsung CNI Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	127,660		13,526
Ownership	[1]	4.30%		18.22%
Acquisition Cost	[1]	₩ 1,500		₩ 3,000
Book value	[1]	2,618		3,000
Fair value	[1]	₩ 2,618		₩ 3,000
IPS Bio Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,975
Ownership	[1]	3.13%
Acquisition Cost	[1]	₩ 1,000
Book value	[1]	1,000
Fair value	[1]	₩ 1,000
Nine B Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	5,000
Ownership	[1]	4.96%
Acquisition Cost	[1]	₩ 1,000
Book value	[1]	1,000
Fair value	[1]	₩ 1,000
Choiganggujo Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	61
Ownership	[1]	0.45%
Acquisition Cost	[1]	₩ 6
Book value	[1]	1
Fair value	[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
Ownership	[1]	0.05%
Acquisition Cost	[1]	₩ 5
Book value	[1]	1
Fair value	[1]	₩ 1
Hosungsteel Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	323
Ownership	[1]	0.26%
Acquisition Cost	[1]	₩ 14
Book value	[1]	3
Fair value	[1]	₩ 3
Uktae IND. Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	140
Ownership	[1]	0.12%
Acquisition Cost	[1]	₩ 7
Book value	[1]	1
Fair value	[1]	₩ 1
Gangdong RS 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
Ownership	[1]	0.01%
Acquisition Cost	[1]	₩ 2
Book value	[1]	2
Fair value	[1]	₩ 2
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
Hyundai Tech Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	28
Ownership	[1]	0.69%
Acquisition Cost	[1]	₩ 10
Book value	[1]	10
Fair value	[1]	₩ 10
Daeil Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	301
Ownership	[1]	0.42%
Acquisition Cost	[1]	₩ 15
Book value	[1]	2
Fair value	[1]	₩ 2
Seohan Food Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	83
Ownership	[1]	0.19%
Acquisition Cost	[1]	₩ 2
Book value	[1]	2
Fair value	[1]	₩ 2
Daehyeon Recycle Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	59
Ownership	[1]	0.61%
Acquisition Cost	[1]	₩ 12
Book value	[1]	12
Fair value	[1]	₩ 12
Metal Link Inc. Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	709
Ownership	[1]	0.17%
Acquisition Cost	[1]	₩ 35
Book value	[1]	4
Fair value	[1]	₩ 4
Pipetec Korea Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	50
Ownership	[1]	0.07%
Acquisition Cost	[1]	₩ 10
Book value	[1]	1
Fair value	[1]	₩ 1
SungJin Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	803
Ownership	[1]	1.20%
Acquisition Cost	[1]	₩ 24
Book value	[1]	8
Fair value	[1]	₩ 8
Yujin E&C Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	29
Ownership	[1]	0.18%
Acquisition Cost	[1]	₩ 6
Book value	[1]	0
Fair value	[1]	₩ 0
Daishin Logistics Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	13
Ownership	[1]	0.09%
Acquisition Cost	[1]	₩ 1
Book value	[1]	1
Fair value	[1]	₩ 1
JinSung Engineering Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	18
Ownership	[1]	0.30%
Acquisition Cost	[1]	₩ 18
Book value	[1]	18
Fair value	[1]	₩ 18
Yongho Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	157
Ownership	[1]	0.22%
Acquisition Cost	[1]	₩ 32
Book value	[1]	1
Fair value	[1]	₩ 1
Wow tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	369
Ownership	[1]	0.75%
Acquisition Cost	[1]	₩ 11
Book value	[1]	11
Fair value	[1]	₩ 11
World Power Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	16
Ownership	[1]	0.28%
Acquisition Cost	[1]	₩ 24
Book value	[1]	24
Fair value	[1]	₩ 24
PBM Auto Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,001
Ownership	[1]	1.06%
Acquisition Cost	[1]	₩ 10
Book value	[1]	10
Fair value	[1]	₩ 10
K2 Motors Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	54
Ownership	[1]	0.28%
Acquisition Cost	[1]	₩ 1
Book value	[1]	1
Fair value	[1]	₩ 1
CL Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	801
Ownership	[1]	2.25%
Acquisition Cost	[1]	₩ 40
Book value	[1]	40
Fair value	[1]	₩ 40
Mirae Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	39
Ownership	[1]	0.04%
Acquisition Cost	[1]	₩ 6
Book value	[1]	6
Fair value	[1]	₩ 6
Gentak Korea Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	301
Ownership	[1]	0.31%
Acquisition Cost	[1]	₩ 8
Book value	[1]	8
Fair value	[1]	₩ 8
Sungjin Chemical Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	118
Ownership	[1]	0.36%
Acquisition Cost	[1]	₩ 4
Book value	[1]	4
Fair value	[1]	₩ 4
LMAT Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	198
Ownership	[1]	0.04%
Acquisition Cost	[1]	₩ 20
Book value	[1]	20
Fair value	[1]	₩ 20
Poong Lim Industrial Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	25
Ownership	[1]	0.00%
Acquisition Cost	[1]	₩ 38
Book value	[1]	38
Fair value	[1]	₩ 38
Dae Sung GeoTech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	631
Ownership	[1]	1.28%
Acquisition Cost	[1]	₩ 32
Book value	[1]	32
Fair value	[1]	₩ 32
Saeheemang Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	756
Ownership	[1]	0.60%
Acquisition Cost	[1]	₩ 15
Book value	[1]	15
Fair value	[1]	₩ 15
Hakbong Precision Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1,460
Ownership	[1]	1.18%
Acquisition Cost	[1]	₩ 15
Book value	[1]	15
Fair value	[1]	₩ 15
Vornech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	431
Ownership	[1]	0.37%
Acquisition Cost	[1]	₩ 11
Book value	[1]	2
Fair value	[1]	₩ 2
Woojin Formtech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	76
Ownership	[1]	0.08%
Acquisition Cost	[1]	₩ 8
Book value	[1]	1
Fair value	[1]	₩ 1
Korea Engineer Manufacturing Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	114
Ownership	[1]	0.26%
Acquisition Cost	[1]	₩ 6
Book value	[1]	1
Fair value	[1]	₩ 1
Sinwa J&K Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	476
Ownership	[1]	0.28%
Acquisition Cost	[1]	₩ 5
Book value	[1]	5
Fair value	[1]	₩ 5
Owon E&G Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	132
Ownership	[1]	0.20%
Acquisition Cost	[1]	₩ 4
Book value	[1]	4
Fair value	[1]	₩ 4
Guseong Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	141
Ownership	[1]	0.20%
Acquisition Cost	[1]	₩ 4
Book value	[1]	4
Fair value	[1]	₩ 4
Irefarm Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	45
Ownership	[1]	0.30%
Acquisition Cost	[1]	₩ 3
Book value	[1]	3
Fair value	[1]	₩ 3
Nam-hae E&C Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	117
Ownership	[1]	0.10%
Acquisition Cost	[1]	₩ 2
Book value	[1]	2
Fair value	[1]	₩ 2
Haenarae Agricultural Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	15
Ownership	[1]	0.03%
Acquisition Cost	[1]	₩ 2
Book value	[1]	2
Fair value	[1]	₩ 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
Ownership	[1]	0.00%
Acquisition Cost	[1]	₩ 2
Book value	[1]	2
Fair value	[1]	₩ 2
Design Beyond Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	17
Ownership	[1]	0.19%
Acquisition Cost	[1]	₩ 2
Book value	[1]	2
Fair value	[1]	₩ 2
LBK Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	8
Ownership	[1]	0.05%
Acquisition Cost	[1]	₩ 1
Book value	[1]	1
Fair value	[1]	₩ 1
Duckwon industrial Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	32
Ownership	[1]	0.43%
Acquisition Cost	[1]	₩ 13
Book value	[1]	13
Fair value	[1]	₩ 13
ASPT Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	64
Ownership	[1]	0.82%
Acquisition Cost	[1]	₩ 19
Book value	[1]	19
Fair value	[1]	₩ 19
SIMA Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	29
Ownership	[1]	0.05%
Acquisition Cost	[1]	₩ 3
Book value	[1]	3
Fair value	[1]	₩ 3
Jingkang Resources Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	90
Ownership	[1]	1.57%
Acquisition Cost	[1]	₩ 13
Book value	[1]	13
Fair value	[1]	₩ 13
Eslin Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	39
Ownership	[1]	0.14%
Acquisition Cost	[1]	₩ 8
Book value	[1]	8
Fair value	[1]	₩ 8
Shinwon Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	275
Ownership	[1]	0.42%
Acquisition Cost	[1]	₩ 19
Book value	[1]	19
Fair value	[1]	₩ 19
CIC Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	96
Ownership	[1]	0.54%
Acquisition Cost	[1]	₩ 10
Book value	[1]	10
Fair value	[1]	₩ 10
Orano Expansion
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	5,742,405
Ownership	[1]	4.72%
Acquisition Cost	[1]	₩ 0
Book value	[1]	0
Fair value	[1]	₩ 0
Fourever Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	44
Ownership	[1]	0.10%
Acquisition Cost	[1]	₩ 4
Book value	[1]	4
Fair value	[1]	₩ 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
Ownership	[1]	0.10%
Acquisition Cost	[1]	₩ 4
Book value	[1]	4
Fair value	[1]	₩ 4
Daeshin ECM Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	182
Ownership	[1]	0.30%
Acquisition Cost	[1]	₩ 9
Book value	[1]	9
Fair value	[1]	₩ 9
Greencarbon Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	79
Ownership	[1]	0.06%
Acquisition Cost	[1]	₩ 1
Book value	[1]	1
Fair value	[1]	₩ 1
Sunkoo Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	4
Ownership	[1]	0.10%
Acquisition Cost	[1]	₩ 2
Book value	[1]	2
Fair value	[1]	₩ 2
Jians Construction Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	13
Ownership	[1]	0.00%
Acquisition Cost	[1]	₩ 2
Book value	[1]	2
Fair value	[1]	₩ 2
DH trading Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	891
Ownership	[1]	0.04%
Acquisition Cost	[1]	₩ 178
Book value	[1]	178
Fair value	[1]	₩ 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
Ownership	[1]	0.09%
Acquisition Cost	[1]	₩ 15
Book value	[1]	15
Fair value	[1]	₩ 15
Steel focus Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	154
Ownership	[1]	0.20%
Acquisition Cost	[1]	₩ 4
Book value	[1]	4
Fair value	[1]	₩ 4
Kamada Korea Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	437
Ownership	[1]	0.33%
Acquisition Cost	[1]	₩ 22
Book value	[1]	22
Fair value	[1]	₩ 22
Fosys Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	19
Ownership	[1]	0.08%
Acquisition Cost	[1]	₩ 4
Book value	[1]	4
Fair value	[1]	₩ 4
GB precision Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	137
Ownership	[1]	0.57%
Acquisition Cost	[1]	₩ 1
Book value	[1]	1
Fair value	[1]	₩ 1
Ewon Art Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	185
Ownership	[1]	0.61%
Acquisition Cost	[1]	₩ 9
Book value	[1]	9
Fair value	[1]	₩ 9
DI Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	3
Ownership	[1]	0.00%
Acquisition Cost	[1]	₩ 0
Book value	[1]	0
Fair value	[1]	₩ 0
Hans AD Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	33
Ownership	[1]	0.35%
Acquisition Cost	[1]	₩ 2
Book value	[1]	2
Fair value	[1]	₩ 2
Chaegim Environment Development Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	158
Ownership	[1]	0.01%
Acquisition Cost	[1]	₩ 3
Book value	[1]	3
Fair value	[1]	₩ 3
Daesung Stain Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	32
Ownership	[1]	0.32%
Acquisition Cost	[1]	₩ 2
Book value	[1]	2
Fair value	[1]	₩ 2
YSM Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	281
Ownership	[1]	2.07%
Acquisition Cost	[1]	₩ 14
Book value	[1]	14
Fair value	[1]	₩ 14
Dong In Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	65
Ownership	[1]	0.13%
Acquisition Cost	[1]	₩ 3
Book value	[1]	3
Fair value	[1]	₩ 3
U&I Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	50
Ownership	[1]	0.22%
Acquisition Cost	[1]	₩ 5
Book value	[1]	5
Fair value	[1]	₩ 5
World One Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	401
Ownership	[1]	0.58%
Acquisition Cost	[1]	₩ 10
Book value	[1]	10
Fair value	[1]	₩ 10
Yewon Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	24
Ownership	[1]	0.02%
Acquisition Cost	[1]	₩ 1
Book value	[1]	0
Fair value	[1]	₩ 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
Ownership	[1]	0.00%
Acquisition Cost	[1]	₩ 24
Book value	[1]	24
Fair value	[1]	₩ 24
Shinsung Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	314
Ownership	[1]	0.01%
Acquisition Cost	[1]	₩ 16
Book value	[1]	16
Fair value	[1]	₩ 16
JSL Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	51
Ownership	[1]	0.49%
Acquisition Cost	[1]	₩ 3
Book value	[1]	3
Fair value	[1]	₩ 3
Loft Garden Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	1
Ownership	[1]	0.04%
Acquisition Cost	[1]	₩ 0
Book value	[1]	0
Fair value	[1]	₩ 0
Handon Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	74
Ownership	[1]	0.25%
Acquisition Cost	[1]	₩ 11
Book value	[1]	11
Fair value	[1]	₩ 11
GH Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	82
Ownership	[1]	0.22%
Acquisition Cost	[1]	₩ 3
Book value	[1]	3
Fair value	[1]	₩ 3
Daeo Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	13
Ownership	[1]	0.23%
Acquisition Cost	[1]	₩ 4
Book value	[1]	4
Fair value	[1]	₩ 4
Bokwang Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	76
Ownership	[1]	0.00%
Acquisition Cost	[1]	₩ 15
Book value	[1]	15
Fair value	[1]	₩ 15
Samkum Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	201
Ownership	[1]	0.48%
Acquisition Cost	[1]	₩ 40
Book value	[1]	40
Fair value	[1]	₩ 40
Dyntex Korea Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	75
Ownership	[1]	0.28%
Acquisition Cost	[1]	₩ 15
Book value	[1]	15
Fair value	[1]	₩ 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
Ownership	[1]	0.15%
Acquisition Cost	[1]	₩ 1
Book value	[1]	1
Fair value	[1]	₩ 1
Mideumeul-juneun-namu Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	119
Ownership	[1]	0.53%
Acquisition Cost	[1]	₩ 6
Book value	[1]	6
Fair value	[1]	₩ 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
Ownership	[1]	0.15%
Acquisition Cost	[1]	₩ 3
Book value	[1]	3
Fair value	[1]	₩ 3
Ilshin Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	36
Ownership	[1]	0.00%
Acquisition Cost	[1]	₩ 7
Book value	[1]	7
Fair value	[1]	₩ 7
Magtec Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	28
Ownership	[1]	0.00%
Acquisition Cost	[1]	₩ 6
Book value	[1]	6
Fair value	[1]	₩ 6
Sukwon Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	2,885
Ownership	[1]	0.59%
Acquisition Cost	[1]	₩ 29
Book value	[1]	29
Fair value	[1]	₩ 29
Hae-sung Metal Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	159
Ownership	[1]	0.17%
Acquisition Cost	[1]	₩ 3
Book value	[1]	3
Fair value	[1]	₩ 3
White&Clean Foods Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	330
Ownership	[1]	0.00%
Acquisition Cost	[1]	₩ 3
Book value	[1]	3
Fair value	[1]	₩ 3
Michang Cable Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	861
Ownership	[1]	0.13%
Acquisition Cost	[1]	₩ 4
Book value	[1]	4
Fair value	[1]	₩ 4
G.M Foods Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	57
Ownership	[1]	0.16%
Acquisition Cost	[1]	₩ 9
Book value	[1]	9
Fair value	[1]	₩ 9
Wecan Global Inc. Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	165
Ownership	[1]	0.08%
Acquisition Cost	[1]	₩ 8
Book value	[1]	8
Fair value	[1]	₩ 8
Daeju Steel Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	11
Ownership	[1]	0.20%
Acquisition Cost	[1]	₩ 1
Book value	[1]	1
Fair value	[1]	₩ 1
Hyundai Glass Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	860
Ownership	[1]	0.83%
Acquisition Cost	[1]	₩ 43
Book value	[1]	43
Fair value	[1]	₩ 43
MEC Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	16,468
Ownership	[1]	1.17%
Acquisition Cost	[1]	₩ 41
Book value	[1]	41
Fair value	[1]	₩ 41
Daeyeoneco Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	151
Ownership	[1]	0.00%
Acquisition Cost	[1]	₩ 15
Book value	[1]	15
Fair value	[1]	₩ 15
Hyesung Cable&Communication Inc.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	762
Ownership	[1]	0.39%
Acquisition Cost	[1]	₩ 38
Book value	[1]	38
Fair value	[1]	₩ 38
Sangjin Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	428
Ownership	[1]	0.35%
Acquisition Cost	[1]	₩ 21
Book value	[1]	21
Fair value	[1]	₩ 21
Topis Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	246
Ownership	[1]	0.71%
Acquisition Cost	[1]	₩ 14
Book value	[1]	14
Fair value	[1]	₩ 14
G & L Tech Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	2
Ownership	[1]	0.06%
Acquisition Cost	[1]	₩ 0
Book value	[1]	0
Fair value	[1]	₩ 0
Cheonhae Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	72
Ownership	[1]	0.00%
Acquisition Cost	[1]	₩ 2
Book value	[1]	2
Fair value	[1]	₩ 2
Iksanguwon Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	563
Ownership	[1]	0.00%
Acquisition Cost	[1]	₩ 11
Book value	[1]	11
Fair value	[1]	₩ 11
Korea Remicon Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	36
Ownership	[1]	0.03%
Acquisition Cost	[1]	₩ 5
Book value	[1]	5
Fair value	[1]	₩ 5
New Tech Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	23
Ownership	[1]	0.15%
Acquisition Cost	[1]	₩ 2
Book value	[1]	2
Fair value	[1]	₩ 2
Segeon Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	124
Ownership	[1]	0.00%
Acquisition Cost	[1]	₩ 4
Book value	[1]	4
Fair value	[1]	₩ 4
MS Tech Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	9
Ownership	[1]	0.15%
Acquisition Cost	[1]	₩ 1
Book value	[1]	1
Fair value	[1]	₩ 1
J.I Steel Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	21
Ownership	[1]	0.00%
Acquisition Cost	[1]	₩ 2
Book value	[1]	2
Fair value	[1]	₩ 2
HNT Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	172
Ownership	[1]	0.00%
Acquisition Cost	[1]	₩ 9
Book value	[1]	9
Fair value	[1]	₩ 9
Taejin Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	27
Ownership	[1]	0.08%
Acquisition Cost	[1]	₩ 3
Book value	[1]	3
Fair value	[1]	₩ 3
Macroad Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	953
Ownership	[1]	0.17%
Acquisition Cost	[1]	₩ 10
Book value	[1]	10
Fair value	[1]	₩ 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
Ownership	[1]	0.00%
Acquisition Cost	[1]	₩ 9
Book value	[1]	9
Fair value	[1]	₩ 9
Electric Contractors Financial Cooperative Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	0
Ownership	[1]	0.00%
Acquisition Cost	[1]	₩ 38
Book value	[1]	38
Fair value	[1]	₩ 38
Information Communication Financial Cooperative Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	0
Ownership	[1]	0.00%
Acquisition Cost	[1]	₩ 15
Book value	[1]	15
Fair value	[1]	₩ 15
Common Computer Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	3,856
Ownership	[1]	1.87%
Acquisition Cost	[1]	₩ 1,000
Book value	[1]	1,000
Fair value	[1]	₩ 1,000
Fine Powerex Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	[1]	72,633
Ownership	[1]	4.92%
Acquisition Cost	[1]	₩ 1,500
Book value	[1]	1,500
Fair value	[1]	1,500
Aron Flying Ship Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Acquisition Cost	[1]	500
Book value	[1]	491
Fair value	[1]	₩ 491
[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, 2020.

Financial Assets at Amortized_3

Financial Assets at Amortized Cost - Summary of Financial Assets at Amortized Cost (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2021	Dec. 31, 2020
Financial Assets at Amortized Cost [Line Items]
Current financial assets at amortized costs	₩ 15,422	₩ 13,149
Non-current financial assets at amortized costs	9,851	1,273
Financial assets at amortized costs	25,273	14,422
Gross carrying amount [member]
Financial Assets at Amortized Cost [Line Items]
Current financial assets at amortized costs	15,422	13,149
Non-current financial assets at amortized costs	9,851	1,273
Financial assets at amortized costs	25,273	14,422
Government grants
Financial Assets at Amortized Cost [Line Items]
Current financial assets at amortized costs	0	0
Non-current financial assets at amortized costs	0	0
Financial assets at amortized costs	0	0
Allowance for doubtful accounts
Financial Assets at Amortized Cost [Line Items]
Current financial assets at amortized costs	0	0
Non-current financial assets at amortized costs	0	0
Financial assets at amortized costs	0	0
Others
Financial Assets at Amortized Cost [Line Items]
Current financial assets at amortized costs	0	0
Non-current financial assets at amortized costs	0	0
Financial assets at amortized costs	0	0
Government bonds
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	1,308	1,422
Government bonds | Gross carrying amount [member]
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	1,308	1,422
Government bonds | Government grants
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	0	0
Government bonds | Allowance for doubtful accounts
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	0	0
Government bonds | Others
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	0	0
Others
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	23,965	13,000
Others | Gross carrying amount [member]
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	23,965	13,000
Others | Government grants
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	0	0
Others | Allowance for doubtful accounts
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	0	0
Others | Others
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	₩ 0	₩ 0

Derivative Instrument - Summary

Derivative Instrument - Summary of Derivatives (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Current derivative financial assets		₩ 126,938	₩ 29,525
Non-current derivative financial assets		520,845	136,888
Current derivative financial liabilities		7,291	49,884
Non-current derivative financial liabilities		70,740	315,235
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)		822,994	(455,715)	₩ 317,350
Net income effects of transaction gain (loss)		84,082	65,393	86,415
Accumulated other comprehensive income (loss)	[1]	(40,460)	111,220	35,727
Currency forward | Not Designated as Hedging Instrument
Derivative [Line Items]
Current derivative financial assets		559	18,332
Non-current derivative financial assets		6,899	0
Current derivative financial liabilities		301	10,014
Non-current derivative financial liabilities		0	4,977
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)		33,066	(40,590)	24,265
Net income effects of transaction gain (loss)		33,032	(17,911)	12,488
Accumulated other comprehensive income (loss)	[1]	0	0	0
Currency swap
Derivative [Line Items]
Current derivative financial assets		125,877	11,193
Non-current derivative financial assets		506,957	127,386
Current derivative financial liabilities		4,446	36,088
Non-current derivative financial liabilities		16,708	232,669
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)		787,264	(406,607)	310,732
Net income effects of transaction gain (loss)		61,353	93,557	110,813
Accumulated other comprehensive income (loss)	[1]	(59,108)	105,642	38,802
Currency swap | Not Designated as Hedging Instrument
Derivative [Line Items]
Current derivative financial assets		92,313	0
Non-current derivative financial assets		335,765	82,931
Current derivative financial liabilities		4,446	0
Non-current derivative financial liabilities		15,576	93,245
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)		420,551	(108,090)	172,087
Net income effects of transaction gain (loss)		16,265	16,661	52,842
Accumulated other comprehensive income (loss)	[1]	0	0	0
Currency swap | Designated as Hedging Instrument
Derivative [Line Items]
Current derivative financial assets		33,564	11,193
Non-current derivative financial assets		171,192	44,455
Current derivative financial liabilities		0	36,088
Non-current derivative financial liabilities		1,132	139,424
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)		366,713	(298,517)	138,645
Net income effects of transaction gain (loss)		45,088	76,896	57,971
Accumulated other comprehensive income (loss)	[1]	(59,108)	105,642	38,802
Interest rate swap
Derivative [Line Items]
Current derivative financial assets		502	0
Non-current derivative financial assets		6,980	9,502
Current derivative financial liabilities		2,544	3,782
Non-current derivative financial liabilities		28,138	66,451
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)		18,123	(1,845)	(16,231)
Net income effects of transaction gain (loss)		(10,303)	(10,253)	(36,886)
Accumulated other comprehensive income (loss)	[1]	18,648	5,578	(3,075)
Interest rate swap | Not Designated as Hedging Instrument
Derivative [Line Items]
Current derivative financial assets		502	0
Non-current derivative financial assets		6,980	9,502
Current derivative financial liabilities		174	2,192
Non-current derivative financial liabilities		2,829	22,687
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)		18,123	(309)	(15,647)
Net income effects of transaction gain (loss)		(10,303)	(11,975)	(2,495)
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		2,370	1,590
Non-current derivative financial liabilities		25,309	43,764
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	(1,536)	(584)
Net income effects of transaction gain (loss)		0	1,722	(34,391)
Accumulated other comprehensive income (loss)	[1]	18,648	5,578	(3,075)
Others | Not Designated as Hedging Instrument
Derivative [Line Items]
Current derivative financial assets		0	0
Non-current derivative financial assets		9	0
Current derivative financial liabilities	[2],[3],[4]	0	0
Non-current derivative financial liabilities	[2],[3],[4]	25,894	11,138
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)		(15,459)	(6,673)	(1,416)
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, 2021, the net loss on valuation of derivatives applying cash flow hedge accounting of ￦15,778 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’.
[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, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivatives [Abstract]
Net gain on valuation of derivatives designated as cash flow hedge	₩ 15,778	₩ (64,561)	₩ (19,242)

Derivatives - Summary of Deriva

Derivatives - Summary of Derivative Currency Swap Forward Contract List (Details) - 12 months ended Dec. 31, 2021 - Currency forward contracts $ in Thousands, ₩ in Millions	KRW (₩)	USD ($)
Disclosure of Derivative Currency forward contract detail list [Line Items]
Derivative Counterparty	Korea Development Bank	Korea Development Bank
Contract date	Sep. 27, 2021	Sep. 27, 2021
Maturity date	Jan. 7, 2022	Jan. 7, 2022
Contract Amount Pay | ₩	₩ 59,049
Contract Amount Receive | $		$ 50,050
Contract exchange rate	1,179.80	1,179.80
Derivative Counterparty	Shinhan Bank	Shinhan Bank
Contract date	Dec. 13, 2021	Dec. 13, 2021
Maturity date	Jan. 4, 2022	Jan. 4, 2022
Contract Amount Pay | ₩	₩ 17,354
Contract Amount Receive | $		$ 14,720
Contract exchange rate	1,178.95	1,178.95
Derivative Counterparty	Hana Bank	Hana Bank
Contract date	Dec. 24, 2021	Dec. 24, 2021
Maturity date	Jan. 11, 2022	Jan. 11, 2022
Contract Amount Pay | ₩	₩ 1,185
Contract Amount Receive | $		$ 1,000
Contract exchange rate	1,185.35	1,185.35
Derivative Counterparty	Hana Bank	Hana Bank
Contract date	Dec. 30, 2021	Dec. 30, 2021
Maturity date	Jan. 6, 2022	Jan. 6, 2022
Contract Amount Pay | ₩	₩ 11,840
Contract Amount Receive | $		$ 10,004
Contract exchange rate	1,183.53	1,183.53
Derivative Counterparty	Kookmin Bank	Kookmin Bank
Contract date	Dec. 23, 2021	Dec. 23, 2021
Maturity date	Jan. 14, 2022	Jan. 14, 2022
Contract Amount Pay | ₩	₩ 11,869
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,186.92	1,186.92
Derivative Counterparty	Mizuho Bank	Mizuho Bank
Contract date	Dec. 27, 2021	Dec. 27, 2021
Maturity date	Jan. 17, 2022	Jan. 17, 2022
Contract Amount Pay | ₩	₩ 11,862
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,186.20	1,186.20
Derivative Counterparty	Morgan Stanley	Morgan Stanley
Contract date	Dec. 24, 2021	Dec. 24, 2021
Maturity date	Jan. 13, 2022	Jan. 13, 2022
Contract Amount Pay | ₩	₩ 11,865
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,186.50	1,186.50
Derivative Counterparty	Nonghyup Bank	Nonghyup Bank
Contract date	Dec. 10, 2021	Dec. 10, 2021
Maturity date	Jan. 3, 2022	Jan. 3, 2022
Contract Amount Pay | ₩	₩ 11,746
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,174.60	1,174.60
Derivative Counterparty	Nonghyup Bank	Nonghyup Bank
Contract date	Dec. 30, 2021	Dec. 30, 2021
Maturity date	Jan. 18, 2022	Jan. 18, 2022
Contract Amount Pay | ₩	₩ 11,880
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,188	1,188
Derivative Counterparty	Nonghyup Bank	Nonghyup Bank
Contract date	Dec. 23, 2021	Dec. 23, 2021
Maturity date	Jan. 12, 2022	Jan. 12, 2022
Contract Amount Pay | ₩	₩ 5,921
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,184.10	1,184.10
Derivative Counterparty	Standard Chartered	Standard Chartered
Contract date	Dec. 24, 2021	Dec. 24, 2021
Maturity date	Jan. 13, 2022	Jan. 13, 2022
Contract Amount Pay | ₩	₩ 11,796
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,179.62	1,179.62
Derivative Counterparty	Woori Bank	Woori Bank
Contract date	Dec. 16, 2021	Dec. 16, 2021
Maturity date	Jan. 13, 2022	Jan. 13, 2022
Contract Amount Pay | ₩	₩ 8,985
Contract Amount Receive | $		$ 7,590
Contract exchange rate	1,183.90	1,183.90
Derivative Counterparty	Woori Bank	Woori Bank
Contract date	Dec. 29, 2021	Dec. 29, 2021
Maturity date	Jan. 20, 2022	Jan. 20, 2022
Contract Amount Pay | ₩	₩ 11,870
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,187	1,187
Derivative Counterparty	JP Morgan	JP Morgan
Contract date	Dec. 23, 2021	Dec. 23, 2021
Maturity date	Jan. 4, 2022	Jan. 4, 2022
Contract Amount Pay | ₩	₩ 14,243
Contract Amount Receive | $		$ 12,000
Contract exchange rate	1,186.88	1,186.88
Derivative Counterparty	JP Morgan	JP Morgan
Contract date	Dec. 23, 2021	Dec. 23, 2021
Maturity date	Jan. 4, 2022	Jan. 4, 2022
Contract Amount Pay | ₩	₩ 6,532
Contract Amount Receive | $		$ 5,500
Contract exchange rate	1,187.68	1,187.68
Derivative Counterparty	HSBC	HSBC
Contract date	Dec. 30, 2021	Dec. 30, 2021
Maturity date	Jan. 7, 2022	Jan. 7, 2022
Contract Amount Pay | ₩	₩ 16,601
Contract Amount Receive | $		$ 14,000
Contract exchange rate	1,185.77	1,185.77
Derivative Counterparty	JP Morgan	JP Morgan
Contract date	Dec. 30, 2021	Dec. 30, 2021
Maturity date	Jan. 7, 2022	Jan. 7, 2022
Contract Amount Pay | ₩	₩ 16,601
Contract Amount Receive | $		$ 14,000
Contract exchange rate	1,185.82	1,185.82
Derivative Counterparty	Nonghyup Bank	Nonghyup Bank
Contract date	Dec. 23, 2021	Dec. 23, 2021
Maturity date	Jan. 10, 2022	Jan. 10, 2022
Contract Amount Pay | ₩	₩ 11,871
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,187.10	1,187.10
Derivative Counterparty	Standard Chartered	Standard Chartered
Contract date	Dec. 23, 2021	Dec. 23, 2021
Maturity date	Jan. 12, 2022	Jan. 12, 2022
Contract Amount Pay | ₩	₩ 10,690
Contract Amount Receive | $		$ 9,000
Contract exchange rate	1,187.80	1,187.80
Derivative Counterparty	Mizuho Bank	Mizuho Bank
Contract date	Dec. 29, 2021	Dec. 29, 2021
Maturity date	Jan. 3, 2022	Jan. 3, 2022
Contract Amount Pay | ₩	₩ 5,932
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,186.40	1,186.40
Derivative Counterparty	JP Morgan	JP Morgan
Contract date	Dec. 29, 2021	Dec. 29, 2021
Maturity date	Jan. 3, 2022	Jan. 3, 2022
Contract Amount Pay | ₩	₩ 4,744
Contract Amount Receive | $		$ 4,000
Contract exchange rate	1,186	1,186
Derivative Counterparty	HSBC	HSBC
Contract date	Dec. 29, 2021	Dec. 29, 2021
Maturity date	Jan. 20, 2022	Jan. 20, 2022
Contract Amount Pay | ₩	₩ 5,936
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,187.14	1,187.14
Derivative Counterparty	HSBC	HSBC
Contract date	Dec. 30, 2021	Dec. 30, 2021
Maturity date	Jan. 21, 2022	Jan. 21, 2022
Contract Amount Pay | ₩	₩ 17,771
Contract Amount Receive | $		$ 15,000
Contract exchange rate	1,184.70	1,184.70
Derivative Counterparty	MUFG	MUFG
Contract date	Dec. 30, 2021	Dec. 30, 2021
Maturity date	Jan. 25, 2022	Jan. 25, 2022
Contract Amount Pay | ₩	₩ 5,925
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,184.90	1,184.90
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	1,127.30	1,127.30
Derivative Counterparty	HSBC	HSBC
Contract date	Nov. 30, 2021	Nov. 30, 2021
Maturity date	Jan. 7, 2022	Jan. 7, 2022
Contract Amount Pay | ₩	₩ 5,939
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,187.70	1,187.70
Derivative Counterparty	HSBC	HSBC
Contract date	Nov. 30, 2021	Nov. 30, 2021
Maturity date	Jan. 7, 2022	Jan. 7, 2022
Contract Amount Pay | ₩	₩ 5,934
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,186.70	1,186.70
Derivative Counterparty	HSBC	HSBC
Contract date	Nov. 30, 2021	Nov. 30, 2021
Maturity date	Jan. 7, 2022	Jan. 7, 2022
Contract Amount Pay | ₩	₩ 5,929
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,185.70	1,185.70
Derivative Counterparty	Woori Bank	Woori Bank
Contract date	Dec. 1, 2021	Dec. 1, 2021
Maturity date	Jan. 7, 2022	Jan. 7, 2022
Contract Amount Pay | ₩	₩ 11,856
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,185.55	1,185.55
Derivative Counterparty	Woori Bank	Woori Bank
Contract date	Dec. 29, 2021	Dec. 29, 2021
Maturity date	Jan. 28, 2022	Jan. 28, 2022
Contract Amount Pay | ₩	₩ 11,885
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,188.50	1,188.50
Derivative Counterparty	MUFG	MUFG
Contract date	Dec. 29, 2021	Dec. 29, 2021
Maturity date	Jan. 28, 2022	Jan. 28, 2022
Contract Amount Pay | ₩	₩ 11,876
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,187.55	1,187.55
Derivative Counterparty	Woori Bank	Woori Bank
Contract date	Dec. 30, 2021	Dec. 30, 2021
Maturity date	Jan. 28, 2022	Jan. 28, 2022
Contract Amount Pay | ₩	₩ 11,852
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,185.20	1,185.20
Derivative Counterparty	Woori Bank	Woori Bank
Contract date	Dec. 23, 2021	Dec. 23, 2021
Maturity date	Feb. 18, 2022	Feb. 18, 2022
Contract Amount Pay | ₩	₩ 8,316
Contract Amount Receive | $		$ 7,000
Contract exchange rate	1,188	1,188
Derivative Counterparty	HSBC	HSBC
Contract date	Dec. 29, 2021	Dec. 29, 2021
Maturity date	Feb. 18, 2022	Feb. 18, 2022
Contract Amount Pay | ₩	₩ 11,880
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,188	1,188
Derivative Counterparty	Shinhan Bank	Shinhan Bank
Contract date	Dec. 24, 2021	Dec. 24, 2021
Maturity date	Feb. 25, 2022	Feb. 25, 2022
Contract Amount Pay | ₩	₩ 5,938
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,187.50	1,187.50
Derivative Counterparty	Hana Bank	Hana Bank
Contract date	Dec. 24, 2021	Dec. 24, 2021
Maturity date	Feb. 25, 2022	Feb. 25, 2022
Contract Amount Pay | ₩	₩ 5,935
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,186.99	1,186.99
Derivative Counterparty	Standard Chartered	Standard Chartered
Contract date	Dec. 29, 2021	Dec. 29, 2021
Maturity date	Feb. 25, 2022	Feb. 25, 2022
Contract Amount Pay | ₩	₩ 11,885
Contract Amount Receive | $		$ 10,000
Contract exchange rate	1,188.50	1,188.50
Derivative Counterparty	MUFG	MUFG
Contract date	Dec. 17, 2021	Dec. 17, 2021
Maturity date	Mar. 18, 2022	Mar. 18, 2022
Contract Amount Pay | ₩	₩ 259
Contract Amount Receive | $		$ 219
Contract exchange rate	1,183.74	1,183.74

Derivatives - Summary of Deri_2

Derivatives - Summary of Derivative Currency Swap Contract List (Details) - 12 months ended Dec. 31, 2021 - 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	1,024.70	1,024.70	1,024.70	1,024.70	1,024.70	1,024.70	1,024.70
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	1,079.70	1,079.70	1,079.70	1,079.70	1,079.70	1,079.70	1,079.70
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	1,206.60	1,206.60	1,206.60	1,206.60	1,206.60	1,206.60	1,206.60
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	1,206.60	1,206.60	1,206.60	1,206.60	1,206.60	1,206.60	1,206.60
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	1,206.60	1,206.60	1,206.60	1,206.60	1,206.60	1,206.60	1,206.60
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	1,083.90	1,083.90	1,083.90	1,083.90	1,083.90	1,083.90	1,083.90
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	1,181.70	1,181.70	1,181.70	1,181.70	1,181.70	1,181.70	1,181.70
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	1,181.70	1,181.70	1,181.70	1,181.70	1,181.70	1,181.70	1,181.70
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	1,181.70	1,181.70	1,181.70	1,181.70	1,181.70	1,181.70	1,181.70
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Citibank	Citibank	Citibank	Citibank	Citibank	Citibank	Citibank
Derivative, Term of Contract	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022
Contract Amount Pay	₩ 112,930
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	2.79	2.79	2.79	2.79	2.79	2.79	2.79
Contract Interest rate Receive	3.00	3.00	3.00	3.00	3.00	3.00	3.00
Contract exchange rate	1,129.30	1,129.30	1,129.30	1,129.30	1,129.30	1,129.30	1,129.30
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	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022
Contract Amount Pay	₩ 112,930
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	2.79	2.79	2.79	2.79	2.79	2.79	2.79
Contract Interest rate Receive	3.00	3.00	3.00	3.00	3.00	3.00	3.00
Contract exchange rate	1,129.30	1,129.30	1,129.30	1,129.30	1,129.30	1,129.30	1,129.30
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Bank of America	Bank of America	Bank of America	Bank of America	Bank of America	Bank of America	Bank of America
Derivative, Term of Contract	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022
Contract Amount Pay	₩ 112,930
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	2.79	2.79	2.79	2.79	2.79	2.79	2.79
Contract Interest rate Receive	3.00	3.00	3.00	3.00	3.00	3.00	3.00
Contract exchange rate	1,129.30	1,129.30	1,129.30	1,129.30	1,129.30	1,129.30	1,129.30
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	2016~2022	2016~2022	2016~2022	2016~2022	2016~2022	2016~2022	2016~2022
Contract Amount Pay	₩ 112,930
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	2.79	2.79	2.79	2.79	2.79	2.79	2.79
Contract Interest rate Receive	3.00	3.00	3.00	3.00	3.00	3.00	3.00
Contract exchange rate	1,129.30	1,129.30	1,129.30	1,129.30	1,129.30	1,129.30	1,129.30
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	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022
Contract Amount Pay	₩ 111,770
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	2.89	2.89	2.89	2.89	2.89	2.89	2.89
Contract Interest rate Receive	3.00	3.00	3.00	3.00	3.00	3.00	3.00
Contract exchange rate	1,117.70	1,117.70	1,117.70	1,117.70	1,117.70	1,117.70	1,117.70
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	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022
Contract Amount Pay	₩ 111,770
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	2.87	2.87	2.87	2.87	2.87	2.87	2.87
Contract Interest rate Receive	3.00	3.00	3.00	3.00	3.00	3.00	3.00
Contract exchange rate	1,117.70	1,117.70	1,117.70	1,117.70	1,117.70	1,117.70	1,117.70
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	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022
Contract Amount Pay	₩ 111,770
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	2.89	2.89	2.89	2.89	2.89	2.89	2.89
Contract Interest rate Receive	3.00	3.00	3.00	3.00	3.00	3.00	3.00
Contract exchange rate	1,117.70	1,117.70	1,117.70	1,117.70	1,117.70	1,117.70	1,117.70
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Deutsche Bank	Deutsche Bank	Deutsche Bank	Deutsche Bank	Deutsche Bank	Deutsche Bank	Deutsche Bank
Derivative, Term of Contract	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022
Contract Amount Pay	₩ 55,885
Contract Amount Receive | $		$ 50,000
Contract Interest rate Pay	2.79	2.79	2.79	2.79	2.79	2.79	2.79
Contract Interest rate Receive	3.00	3.00	3.00	3.00	3.00	3.00	3.00
Contract exchange rate	1,117.70	1,117.70	1,117.70	1,117.70	1,117.70	1,117.70	1,117.70
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	1,111.90	1,111.90	1,111.90	1,111.90	1,111.90	1,111.90	1,111.90
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	1,111.90	1,111.90	1,111.90	1,111.90	1,111.90	1,111.90	1,111.90
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	1,111.90	1,111.90	1,111.90	1,111.90	1,111.90	1,111.90	1,111.90
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	1,111.90	1,111.90	1,111.90	1,111.90	1,111.90	1,111.90	1,111.90
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	1,116.10	1,116.10	1,116.10	1,116.10	1,116.10	1,116.10	1,116.10
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	1,116.10	1,116.10	1,116.10	1,116.10	1,116.10	1,116.10	1,116.10
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	1,116.10	1,116.10	1,116.10	1,116.10	1,116.10	1,116.10	1,116.10
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	1,135.20	1,135.20	1,135.20	1,135.20	1,135.20	1,135.20	1,135.20
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	1,135.20	1,135.20	1,135.20	1,135.20	1,135.20	1,135.20	1,135.20
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	1,135.20	1,135.20	1,135.20	1,135.20	1,135.20	1,135.20	1,135.20
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	1,135.20	1,135.20	1,135.20	1,135.20	1,135.20	1,135.20	1,135.20
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Citibank	Citibank	Citibank	Citibank	Citibank	Citibank	Citibank
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	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	1,187.80	1,187.80	1,187.80	1,187.80	1,187.80	1,187.80	1,187.80
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	1,187.80	1,187.80	1,187.80	1,187.80	1,187.80	1,187.80	1,187.80
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	1,187.80	1,187.80	1,187.80	1,187.80	1,187.80	1,187.80	1,187.80
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	1,189.10	1,189.10	1,189.10	1,189.10	1,189.10	1,189.10	1,189.10
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	1,189.10	1,189.10	1,189.10	1,189.10	1,189.10	1,189.10	1,189.10
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	1,189.10	1,189.10	1,189.10	1,189.10	1,189.10	1,189.10	1,189.10
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	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	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022
Contract Amount Pay	₩ 112,650
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	1.80	1.80	1.80	1.80	1.80	1.80	1.80
Contract Interest rate Receive	3.38	3.38	3.38	3.38	3.38	3.38	3.38
Contract exchange rate	1,126.50	1,126.50	1,126.50	1,126.50	1,126.50	1,126.50	1,126.50
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	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022
Contract Amount Pay	₩ 112,650
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	1.80	1.80	1.80	1.80	1.80	1.80	1.80
Contract Interest rate Receive	3.38	3.38	3.38	3.38	3.38	3.38	3.38
Contract exchange rate	1,126.50	1,126.50	1,126.50	1,126.50	1,126.50	1,126.50	1,126.50
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	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022
Contract Amount Pay	₩ 112,650
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	1.80	1.80	1.80	1.80	1.80	1.80	1.80
Contract Interest rate Receive	3.38	3.38	3.38	3.38	3.38	3.38	3.38
Contract exchange rate	1,126.50	1,126.50	1,126.50	1,126.50	1,126.50	1,126.50	1,126.50
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	1,142.30	1,142.30	1,142.30	1,142.30	1,142.30	1,142.30	1,142.30
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	1,142.30	1,142.30	1,142.30	1,142.30	1,142.30	1,142.30	1,142.30
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	1,142.30	1,142.30	1,142.30	1,142.30	1,142.30	1,142.30	1,142.30
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	1,069.60	1,069.60	1,069.60	1,069.60	1,069.60	1,069.60	1,069.60
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	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022
Contract Amount Pay	₩ 117,340
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	1.06	1.06	1.06	1.06	1.06	1.06	1.06
Contract Interest rate Receive	2.38	2.38	2.38	2.38	2.38	2.38	2.38
Contract exchange rate	1,173.40	1,173.40	1,173.40	1,173.40	1,173.40	1,173.40	1,173.40
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	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022
Contract Amount Pay	₩ 117,340
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	1.06	1.06	1.06	1.06	1.06	1.06	1.06
Contract Interest rate Receive	2.38	2.38	2.38	2.38	2.38	2.38	2.38
Contract exchange rate	1,173.40	1,173.40	1,173.40	1,173.40	1,173.40	1,173.40	1,173.40
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	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022
Contract Amount Pay	₩ 117,340
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	1.06	1.06	1.06	1.06	1.06	1.06	1.06
Contract Interest rate Receive	2.38	2.38	2.38	2.38	2.38	2.38	2.38
Contract exchange rate	1,173.40	1,173.40	1,173.40	1,173.40	1,173.40	1,173.40	1,173.40
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	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Derivative, Term of Contract	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022
Contract Amount Pay	₩ 226,600
Contract Amount Receive | $		$ 200,000
Contract Interest rate Pay	1.94	1.94	1.94	1.94	1.94	1.94	1.94
Contract Interest rate Receive	2.63	2.63	2.63	2.63	2.63	2.63	2.63
Contract exchange rate	1,133	1,133	1,133	1,133	1,133	1,133	1,133
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	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022
Contract Amount Pay	₩ 113,300
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	1.94	1.94	1.94	1.94	1.94	1.94	1.94
Contract Interest rate Receive	2.63	2.63	2.63	2.63	2.63	2.63	2.63
Contract exchange rate	1,133	1,133	1,133	1,133	1,133	1,133	1,133
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	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022
Contract Amount Pay	₩ 113,300
Contract Amount Receive | $		$ 100,000
Contract Interest rate Pay	1.95	1.95	1.95	1.95	1.95	1.95	1.95
Contract Interest rate Receive	2.63	2.63	2.63	2.63	2.63	2.63	2.63
Contract exchange rate	1,133	1,133	1,133	1,133	1,133	1,133	1,133
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	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022
Contract Amount Pay	₩ 56,650
Contract Amount Receive | $		$ 50,000
Contract Interest rate Pay	1.95	1.95	1.95	1.95	1.95	1.95	1.95
Contract Interest rate Receive	2.63	2.63	2.63	2.63	2.63	2.63	2.63
Contract exchange rate	1,133	1,133	1,133	1,133	1,133	1,133	1,133
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	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022
Contract Amount Pay	₩ 56,650
Contract Amount Receive | $		$ 50,000
Contract Interest rate Pay	1.95	1.95	1.95	1.95	1.95	1.95	1.95
Contract Interest rate Receive	2.63	2.63	2.63	2.63	2.63	2.63	2.63
Contract exchange rate	1,133	1,133	1,133	1,133	1,133	1,133	1,133
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 Interest rate Receive	3.88	3.88	3.88	3.88	3.88	3.88	3.88
Contract exchange rate	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90
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	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90
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	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90
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	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90
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	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90
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	1,227.80	1,227.80	1,227.80	1,227.80	1,227.80	1,227.80	1,227.80
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	1,227.80	1,227.80	1,227.80	1,227.80	1,227.80	1,227.80	1,227.80
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	1,227.80	1,227.80	1,227.80	1,227.80	1,227.80	1,227.80	1,227.80

Derivatives - Summary of Deri_3

Derivatives - Summary of Derivative Interest Rate Swap Contract List (Details) - 12 months ended Dec. 31, 2021 $ in Thousands, ₩ in Millions		KRW (₩)	USD ($)
Designated as Hedging Instrument | Interest rate swap 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 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 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 | $			60,316
Designated as Hedging Instrument | Interest rate swap 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 | $			60,316
Designated as Hedging Instrument | Interest rate swap 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 | $			$ 71,116
Not Designated as Hedging Instrument | Interest rate swap contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Hana Bank
Derivative, Term of Contract		2017~2022
Contract Interest rate Pay		2.01
Contract Interest rate Receive		3M CD + 0.24%
Contract amount		₩ 100,000
Not Designated as Hedging Instrument | Interest rate swap contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Hana Bank
Derivative, Term of Contract		2017~2022
Contract Interest rate Pay		2.06
Contract Interest rate Receive		3M CD + 0.27%
Contract amount		₩ 100,000
Not Designated as Hedging Instrument | Interest rate swap 3 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 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 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 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 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 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 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Societe Generale
Derivative, Term of Contract		2017~2022
Contract Interest rate Pay		3M Libor + 3.44%
Contract Interest rate Receive		3.77
Contract amount		₩ 200,000
Not Designated as Hedging Instrument | Interest rate swap 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 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 12 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 13 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
[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, 2021
Interest rate swap 3 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Contract Interest rate Pay	2.56	[1]
Interest rate swap 3 contracts | First Five Years [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Contract Interest rate Pay	2.56
Interest rate swap 3 contracts | Thereafter [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Contract Interest rate Pay	3M CD + 0.10
Interest rate swap 12 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Contract Interest rate Pay	1.84	[2]
Interest rate swap 12 contracts | First Five Years [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Contract Interest rate Pay	1.84
Interest rate swap 12 contracts | Thereafter [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Contract Interest rate Pay	3M CMT + 0.35
Interest rate swap 13 contracts
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Contract Interest rate Pay	1.87	[3]
Interest rate swap 13 contracts | First Five Years [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Contract Interest rate Pay	1.87
Interest rate swap 13 contracts | 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, 2021	Dec. 31, 2020
Other Financial Assets [Line Items]
Current Other financial assets	₩ 1,365,603	₩ 1,561,445
Non-Current Other financial assets	1,271,976	1,290,820
Loans and receivables
Other Financial Assets [Line Items]
Current Other financial assets	87,589	77,963
Non-Current Other financial assets	821,482	712,199
Loans and receivables | Gross amount
Other Financial Assets [Line Items]
Current Other financial assets	88,406	78,806
Non-Current Other financial assets	903,397	762,555
Loans and receivables | Allowance for doubtful accounts
Other Financial Assets [Line Items]
Current Other financial assets	(10)	(1)
Non-Current Other financial assets	(52,667)	(20,266)
Loans and receivables | Present value discount
Other Financial Assets [Line Items]
Current Other financial assets	(807)	(842)
Non-Current Other financial assets	(29,248)	(30,090)
Short-term financial instruments
Other Financial Assets [Line Items]
Current Other financial assets	1,278,014	1,483,482
Long-term financial instruments
Other Financial Assets [Line Items]
Non-Current Other financial assets	₩ 450,494	₩ 578,621

Other Financial Assets - Summ_2

Other Financial Assets - Summary of Loans and Receivables (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2021	Dec. 31, 2020
Loans And Leases Receivable Disclosure [Line Items]
Short-term loans and receivables Face value	₩ 88,406	₩ 78,806
Short-term loans and receivables Allowance for doubtful accounts	(10)	(1)
Short-term loans and receivables Present value discount	(807)	(842)
Short-term loans and receivables	87,589	77,963
Long-term loans and receivables Face value	903,397	762,555
Long-term loans and receivables Allowance for doubtful accounts	(52,667)	(20,266)
Long-term loans and receivables Present value discount	(29,248)	(30,090)
Long-term loans and receivables	821,482	712,199
Loans and receivables Face value	991,803	841,361
Loans and receivables Allowance for doubtful accounts	(52,677)	(20,267)
Loans and receivables Present value discount	(30,055)	(30,932)
Loans and receivables	909,071	790,162
Loans for tuition
Loans And Leases Receivable Disclosure [Line Items]
Short-term loans and receivables Face value	28,975	33,864
Short-term loans and receivables Allowance for doubtful accounts	0	0
Short-term loans and receivables Present value discount	(807)	(842)
Short-term loans and receivables	28,168	33,022
Long-term loans and receivables Face value	431,002	420,274
Long-term loans and receivables Allowance for doubtful accounts	(37,783)	(9,091)
Long-term loans and receivables Present value discount	(29,248)	(30,090)
Long-term loans and receivables	363,971	381,093
Loans for housing
Loans And Leases Receivable Disclosure [Line Items]
Short-term loans and receivables Face value	25,750	21,988
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	25,750	21,988
Long-term loans and receivables Face value	282,833	237,100
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	282,833	237,100
Loans for related parties
Loans And Leases Receivable Disclosure [Line Items]
Long-term loans and receivables Face value	150,541	50,682
Long-term loans and receivables Allowance for doubtful accounts	(14,861)	(1,047)
Long-term loans and receivables Present value discount	0	0
Long-term loans and receivables	135,680	49,635
Fisheries loan
Loans And Leases Receivable Disclosure [Line Items]
Short-term loans and receivables Face value		3,816
Short-term loans and receivables Allowance for doubtful accounts		0
Short-term loans and receivables Present value discount		0
Short-term loans and receivables		3,816
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	33,681	19,138
Short-term loans and receivables Allowance for doubtful accounts	(10)	(1)
Short-term loans and receivables Present value discount	0	0
Short-term loans and receivables	33,671	19,137
Long-term loans and receivables Face value	38,818	54,499
Long-term loans and receivables Allowance for doubtful accounts	(23)	(10,128)
Long-term loans and receivables Present value discount	0	0
Long-term loans and receivables	₩ 38,795	₩ 44,371

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, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowance for doubtful accounts [Abstract]
Beginning balance	₩ 20,267	₩ 15,094	₩ 4,952
Bad debt expense	30,942	5,173	10,142
Other	1,468	0	0
Ending balance	₩ 52,677	₩ 20,267	₩ 15,094

Other Financial Assets - Summ_4

Other Financial Assets - Summary of Long-Term and Short-Term Financial Instruments (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2021	Dec. 31, 2020
Short-term financial instruments
Long / short-term financial instruments [Line Items]
Time deposits	₩ 976,899	₩ 996,265
CD	0	50,000
RP	0	203,008
Others	301,115	234,209
Long / short-term financial instruments	1,278,014	1,483,482
Long-term financial instruments
Long / short-term financial instruments [Line Items]
Time deposits	103,607	160,433
CD	0	0
RP	0	0
Others	346,887	418,188
Long / short-term financial instruments	₩ 450,494	₩ 578,621

Inventories - Summary of Invent

Inventories - Summary of Inventories (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2021	Dec. 31, 2020
Inventories [Line Items]
Raw materials	₩ 3,654,341	₩ 3,601,188
Merchandise	512	234
Work-in-progress	180,220	148,067
Finished goods	27,254	42,070
Supplies	2,537,159	2,272,790
Inventories in transit	1,195,148	666,967
Other inventories	13,548	11,593
Total Inventories	7,608,182	6,742,909
Acquisition cost
Inventories [Line Items]
Raw materials	3,655,588	3,602,073
Merchandise	512	234
Work-in-progress	180,220	148,067
Finished goods	27,254	42,070
Supplies	2,541,028	2,280,682
Inventories in transit	1,195,148	666,967
Total Inventories	7,613,298	6,751,686
Valuation allowance
Inventories [Line Items]
Raw materials	(1,247)	(885)
Merchandise	0	0
Work-in-progress	0	0
Finished goods	0	0
Supplies	(3,869)	(7,892)
Inventories in transit	0	0
Other inventories	0	0
Total Inventories	₩ (5,116)	₩ (8,777)

Inventories - Additional inform

Inventories - Additional information (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Inventories [Line Items]
Reversal of write down of inventory	₩ 11,422	₩ 2,020	₩ 4,872
Write down of inventory	7,761	4,998	3,127
Other Gains Losses [Member]
Inventories [Line Items]
Write down of inventory	₩ 7,761	₩ 4,998	₩ 3,127

Non-Financial Assets - Summary

Non-Financial Assets - Summary of Non-Financial Assets (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2021	Dec. 31, 2020
Other Current Assets
Non-Financial Assets [Line Items]
Advance payment	₩ 161,466	₩ 169,737
Prepaid Expenses	756,729	216,073
Miscellaneous Non-Financial Assets
Greenhouse gas emissions rights	524,658	357,355
Other quick assets	316,138	276,993
Miscellaneous Non-Financial Assets	840,796	634,348
Non-Financial Assets	1,758,991	1,020,158
Other Noncurrent Assets
Non-Financial Assets [Line Items]
Advance payment	124,305	32,693
Prepaid Expenses	151,095	140,730
Miscellaneous Non-Financial Assets
Greenhouse gas emissions rights	0	0
Other quick assets	89,418	72,969
Miscellaneous Non-Financial Assets	89,418	72,969
Non-Financial Assets	₩ 364,818	₩ 246,392

Consolidated Subsidiaries - Sum

Consolidated Subsidiaries - Summary of Consolidated Subsidiaries (Details)		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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		Korea		Korea	[1]
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 (%)		51.00%		51.00%
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
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
KEPCO International Philippines Inc.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company		Holding company
Location		Philippines
Proportion of ownership (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
KEPCO Philippines Holdings 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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		51.00%		51.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
KOREA Imouraren Uranium Investment Corp.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company		Holding company
Location		France		France
Proportion of ownership (%)		0.00%		100.00%
Reason		Liquidation
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		80.00%		80.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		80.00%		80.00%
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 (%)		100.00%		100.00%
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 (%)		56.00%		56.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		51.00%		51.00%
PT. Cirebon Power Service
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[2]	Operation of utility plant		Operation of utility plant
Location		Indonesia	[2]	Indonesia
Proportion of ownership (%)	[2]	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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
DG Fairhaven 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 (%)		0.00%		100.00%
Reason		Disposal
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		70.00%		70.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
KOSEP USA, Inc.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation		Power generation
Location		USA		USA
Proportion of ownership (%)		0.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
Mira Power Limited
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[3]	Power generation		Power generation
Location		Pakistan	[3]	Pakistan
Proportion of ownership (%)	[3]	76.00%		76.00%
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	[4]	RDF power generation		RDF power generation
Location		Korea		Korea	[4]
Proportion of ownership (%)	[4]	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 (%)		100.00%		100.00%
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 (%)		95.00%		95.00%
HeeMang 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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
KOSPO Youngnam Power Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[5]	Operation of utility plant		Operation of utility plant
Location		Korea	[5]	Korea
Proportion of ownership (%)	[5]	50.00%		50.00%
VI Carbon Professional Private Special Asset Investment Trust 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 (%)		0.00%		96.67%
Reason		Liquidation
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 (%)		65.00%		80.10%
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 (%)		100.00%		100.00%
KEPCO Solar Co., Ltd. (formerly, Solar School Plant 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 (%)		100.00%		100.00%
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 (%)		65.00%		65.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		50.10%		50.10%
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 (%)		100.00%		100.00%
KEPCO Mangilao Holdings LLC (formerly, KEPCO-LG CNS Mangilao Holdings LLC)
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[6]	Holding company		Holding company
Location		USA		USA	[6]
Proportion of ownership (%)	[6]	100.00%		100.00%
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 (%)		100.00%		100.00%
KEPCO Mangilao Solar, LLC (formerly, KEPCO-LG CNS 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 (%)		100.00%		100.00%
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%		75.99%
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 (%)		55.00%		55.00%
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 (%)		95.00%		95.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		60.00%		60.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		95.00%		95.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		63.00%		63.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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	[7]	Holding company		Holding company
Location		USA		USA	[7]
Proportion of ownership (%)	[7]	100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		89.00%		89.00%
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 (%)		100.00%		100.00%
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 (%)		90.00%		90.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		70.00%		70.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		100.00%
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 (%)		100.00%		0.00%
Reason		Newly established
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 (%)		100.00%		0.00%
Reason		New investment
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 (%)		100.00%		0.00%
Reason		New investment
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 (%)		100.00%		0.00%
Reason		New investment
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 (%)		100.00%		0.00%
Reason		New investment
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 (%)		100.00%		0.00%
Reason		New investment
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 (%)		100.00%		0.00%
Reason		New investment
LSG Hydro Power Limited [Member]
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%		0.00%
Reason		Newly established
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 (%)		70.00%		0.00%
Reason		Newly established
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 (%)		100.00%		0.00%
Reason		Newly established
Elara Investment Holdings, LLC(*8)
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[8]	Holding company		Holding company
Location		USA		USA	[8]
Proportion of ownership (%)	[8]	0.10%		0.00%
Reason		Newly established
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 (%)		51.22%		0.00%
Reason		Newly established
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 (%)		100.00%		0.00%
Reason		Newly established
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 (%)		100.00%		0.00%
Reason		Newly established
Elara Development Holdings, LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company
Location		USA		USA
Proportion of ownership (%)		100.00%		0.00%
Reason		Newly established
Elara Development, LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company
Location		USA		USA
Proportion of ownership (%)		100.00%		0.00%
Reason		Newly established
Elara Energy Holdings, LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities	[8]	Holding company		Holding company
Location		USA	[8]	USA
Proportion of ownership (%)	[8]	43.94%		0.00%
Reason		Newly established
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 (%)		100.00%		0.00%
Reason		New investment
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 (%)		100.00%		0.00%
Reason		New investment
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 (%)		80.00%		0.00%
Reason		Change in a relationship
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 (%)		100.00%		0.00%
Reason		Newly established
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 (%)		100.00%		0.00%
Reason		Newly established
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 (%)		100.00%		0.00%
Reason		Newly established
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 (%)		100.00%		0.00%
Reason		Newly established
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 (%)		100.00%		0.00%
Reason		Newly established
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 (%)		100.00%		0.00%
Reason		Newly established
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 (%)		100.00%		0.00%
Reason		Newly established
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 (%)		100.00%		0.00%
Reason		Newly established
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 (%)		100.00%		0.00%
Reason		New investment
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 (%)		70.00%		0.00%
Reason		Newly established
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 (%)		100.00%		0.00%
Reason		Newly established
Prime Swedish Holding AB
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Reason		Change in a relationship
[1]	Considering treasury stocks, the effective percentage of ownership is 66.08%.
[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.
[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 84 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 the shareholders’ agreement.
[6]	As of the end of the reporting period, the Company does not have a shareholding; however, this subsidiary is included in the consolidated financial statements as the Company has control over the entity by virtue of the right to nominate all 4 members of the board of directors.
[7]	As of the end of the reporting period, the Company does not have a shareholding; however, this subsidiary is included in the consolidated financial statements as the Company has control over the entity by virtue of the right to nominate the CEO and key management members.
[8]	The effective percentage of ownership is less than 50%. However, this consolidated subsidiary is included in the consolidated financial statements as the Company has control over the board of directors under the shareholders’ agreement.

Consolidated Subsidiaries - S_2

Consolidated Subsidiaries - Summary of Consolidated Subsidiaries (Parentheticals) (Details)		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020
KEPCO Engineering & Construction Company, Inc.
Disclosure of subsidiaries [line items]
Proportion of ownership percentage	[1]	65.77%	65.77%
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		50.00%
KOSPO Youngnam Power Co., Ltd.
Disclosure of subsidiaries [line items]
Proportion of ownership percentage	[3]	50.00%	50.00%
Elara Investment Holdings, LLC
Disclosure of subsidiaries [line items]
Proportion of ownership percentage	[4]	0.10%	0.00%
Description of Reason for Subsidiary Included in in the Consolidated Financial Statements		50.00%
[1]	Considering treasury stocks, the effective percentage of ownership is 66.08%.
[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 the shareholders’ agreement.
[4]	The effective percentage of ownership is less than 50%. However, this consolidated subsidiary is included in the consolidated financial statements as the Company has control over the board of directors under the shareholders’ agreement.

Consolidated Subsidiaries - S_3

Consolidated Subsidiaries - Summary of Financial Information of Consolidated Subsidiaries (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021		Dec. 31, 2020
Korea Hydro & Nuclear Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	₩ 64,638,690		₩ 61,859,753
Total liabilities	38,361,337		35,652,467
Sales	9,324,391		9,938,941
Profit (loss) for the year	302,232		647,641
Korea South-East Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	11,487,325		10,858,645
Total liabilities	6,510,826		5,954,129
Sales	5,188,856		4,258,904
Profit (loss) for the year	(58,096)		(139,149)
Korea Midland Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	13,756,040		13,028,436
Total liabilities	9,912,907		9,357,603
Sales	5,263,302		4,293,364
Profit (loss) for the year	54,869		(29,880)
Korea Western Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	10,822,780		10,357,023
Total liabilities	7,116,671		6,594,779
Sales	4,970,805		3,605,986
Profit (loss) for the year	(171,562)		(108,953)
Korea Southern Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	11,350,984		10,658,015
Total liabilities	7,099,881		6,411,524
Sales	5,671,989		4,015,941
Profit (loss) for the year	(113,352)		(17,588)
Korea East-West Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	9,895,739		9,619,485
Total liabilities	5,163,005		4,974,645
Sales	4,743,030		4,155,416
Profit (loss) for the year	10,872		(65,427)
KEPCO Engineering & Construction Company, Inc.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	705,043		699,244
Total liabilities	191,592		200,169
Sales	433,127		431,723
Profit (loss) for the year	16,452		20,160
KEPCO Plant Service & Engineering Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	1,420,705		1,345,857
Total liabilities	311,607		296,515
Sales	1,375,668		1,299,186
Profit (loss) for the year	98,132		85,916
KEPCO Nuclear Fuel Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	837,249		798,368
Total liabilities	405,614		390,155
Sales	323,729		331,228
Profit (loss) for the year	25,799		14,542
KEPCO KDN Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	721,634		647,496
Total liabilities	189,242		174,192
Sales	673,261		641,308
Profit (loss) for the year	67,244		45,207
KEPCO International HongKong Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	128,968		120,213
Total liabilities	0		0
Sales	0		0
Profit (loss) for the year	341		1,571
KEPCO International Philippines Inc.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	154,317		133,215
Total liabilities	482		366
Sales	0		0
Profit (loss) for the year	8,766		35,182
KEPCO Gansu International Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	7,151		7,753
Total liabilities	559		512
Sales	0		0
Profit (loss) for the year	(25)		(19)
KEPCO Philippines Holdings Inc.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	191,757		187,375
Total liabilities	128		127
Sales	0		0
Profit (loss) for the year	60,192		65,792
KEPCO Philippines Corporation
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	6,122		6,173
Total liabilities	19		17
Sales	0		0
Profit (loss) for the year	(68)		(187)
KEPCO Ilijan Corporation
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	259,069		322,066
Total liabilities	38,555		47,234
Sales	60,532		81,400
Profit (loss) for the year	12,981		39,443
KEPCO Lebanon SARL
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	1,729		1,669
Total liabilities	9,794		9,195
Sales	0		0
Profit (loss) for the year	(86)		(59)
KEPCO Neimenggu International Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	241,299		213,444
Total liabilities	3,106		2,492
Sales	0		0
Profit (loss) for the year	16,762		26,593
KEPCO Shanxi International Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	551,407		508,363
Total liabilities	207,844		196,408
Sales	0		0
Profit (loss) for the year	3,526		2,278
KOMIPO Global Pte Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	302,340		263,378
Total liabilities	1,351		656
Sales	0		0
Profit (loss) for the year	11,462		12,460
KEPCO Netherlands B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	133,610		117,449
Total liabilities	866		71
Sales	0		0
Profit (loss) for the year	5,395		14,503
KOREA Imouraren Uranium Investment Corp.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	83		13,955
Total liabilities	0		123
Sales	0		0
Profit (loss) for the year	(13,898)		(675)
KEPCO Australia Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	481		451
Total liabilities	11		17
Sales	0		0
Profit (loss) for the year	25		71
KOSEP Australia Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	44,798		34,249
Total liabilities	5,561		3,500
Sales	22,013		14,327
Profit (loss) for the year	8,268		2,150
KOMIPO Australia Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	54,162		45,250
Total liabilities	5,648		3,782
Sales	22,013		14,327
Profit (loss) for the year	5,942		2,685
KOWEPO Australia Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	54,564		44,270
Total liabilities	4,766		2,909
Sales	22,013		14,327
Profit (loss) for the year	7,387		1,663
KOSPO Australia Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	43,886		38,341
Total liabilities	4,502		2,750
Sales	22,013		14,327
Profit (loss) for the year	5,940		2,242
KEPCO Middle East Holding Company
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	104,068		90,601
Total liabilities	89,756		78,553
Sales	0		0
Profit (loss) for the year	1,144		(1,539)
Qatrana Electric Power Company
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	480,809		464,507
Total liabilities	262,725		287,859
Sales	21,368		21,279
Profit (loss) for the year	19,156		24,717
KHNP Canada Energy, Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	109,326		63,794
Total liabilities	25		26
Sales	0		0
Profit (loss) for the year	29		(7)
KEPCO Bylong Australia Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	44,319		44,691
Total liabilities	394,349		349,542
Sales	0		0
Profit (loss) for the year	(37,065)		16,897
Korea Waterbury Uranium Limited Partnership
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	20,920		20,908
Total liabilities	159		165
Sales	0		0
Profit (loss) for the year	(57)		(76)
KEPCO Holdings de Mexico
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	148		148
Total liabilities	27		27
Sales	0		0
Profit (loss) for the year	(8)		(14)
KST Electric Power Company, S.A.P.I. de C.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	584,625		531,367
Total liabilities	435,796		410,743
Sales	151,467		65,695
Profit (loss) for the year	18,499		37,899
KEPCO Energy Service Company
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	2,500		2,255
Total liabilities	956		994
Sales	12,070		5,880
Profit (loss) for the year	574		507
KEPCO Netherlands S3 B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	51,045		44,042
Total liabilities	150		54
Sales	0		0
Profit (loss) for the year	3,199		2,833
PT. KOMIPO Pembangkitan Jawa Bali
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	13,499		12,946
Total liabilities	3,314		3,298
Sales	18,296		20,306
Profit (loss) for the year	885		4,775
PT. Cirebon Power Service
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	2,545		1,825
Total liabilities	631		550
Sales	8,664		8,642
Profit (loss) for the year	505		344
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	33,782		31,620
Total liabilities	16,298		15,654
Sales	9,698		9,356
Profit (loss) for the year	816		1,570
EWP America Inc.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	46,687	[1]	37,681	[2]
Total liabilities	1,278	[1]	2,683	[2]
Sales	18,335	[1]	14,312	[2]
Profit (loss) for the year	6,807	[1]	(14,327)	[2]
KNF Canada Energy Limited
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	2,101		1,871
Total liabilities	17		22
Sales	0		0
Profit (loss) for the year	(43)		(50)
EWP Barbados 1 SRL
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	354,024		313,409
Total liabilities	1,172		1,170
Sales	2,861		2,950
Profit (loss) for the year	16,168		44,729
Gyeonggi Green Energy Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	243,977		265,768
Total liabilities	224,132		240,366
Sales	93,794		64,660
Profit (loss) for the year	(5,588)		(9,968)
PT. Tanggamus Electric Power
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	212,161		217,730
Total liabilities	167,409		184,057
Sales	2,903		3,491
Profit (loss) for the year	3,017		11,942
Gyeongju Wind Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	96,937		105,726
Total liabilities	60,702		68,629
Sales	15,289		13,939
Profit (loss) for the year	3,132		2,108
KOMIPO America Inc.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	329,986	[3]	105,926
Total liabilities	56,325	[3]	918
Sales	1,715	[3]	342
Profit (loss) for the year	(1,311)	[3]	(1,783)
KOSEP USA, Inc.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets			1
Total liabilities			4,837
Sales			0
Profit (loss) for the year			0
PT. EWP Indonesia
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	47,031		33,900
Total liabilities	1,226		1,125
Sales	0		0
Profit (loss) for the year	4,615		7,083
KEPCO Netherlands J3 B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	151,478		138,824
Total liabilities	172		84
Sales	0		0
Profit (loss) for the year	27,365		28,242
Korea Offshore Wind Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	359,393		354,643
Total liabilities	188,507		187,576
Sales	36,020		26,838
Profit (loss) for the year	3,820		98
Global One Pioneer B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	119		177
Total liabilities	116		60
Sales	0		0
Profit (loss) for the year	(132)		(76)
Global Energy Pioneer B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	293		338
Total liabilities	131		64
Sales	0		0
Profit (loss) for the year	(147)		(70)
Mira Power Limited
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	424,183		348,737
Total liabilities	311,459		266,565
Sales	70,287		31,172
Profit (loss) for the year	34,018		(2,960)
KOSEP Material Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	3,405		2,312
Total liabilities	842		429
Sales	4,518		3,457
Profit (loss) for the year	442		189
Commerce and Industry Energy Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	85,315		89,681
Total liabilities	35,543		41,384
Sales	30,531		31,603
Profit (loss) for the year	1,345		1,623
KEPCO KPS Philippines Corp.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	8,051		3,119
Total liabilities	3,652		284
Sales	9,768		5,151
Profit (loss) for the year	1,493		158
KOSPO Chile SpA
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	142,956		128,795
Total liabilities	56,688		48,813
Sales	0		0
Profit (loss) for the year	(851)		(542)
PT. KOWEPO Sumsel Operation and Maintenance Services
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	116		108
Total liabilities	259		241
Sales	0		0
Profit (loss) for the year	0		(15)
HeeMang Sunlight Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	6,242		7,261
Total liabilities	3,272		4,339
Sales	499		423
Profit (loss) for the year	47		(142)
Fujeij Wind Power Company
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	200,783		194,844
Total liabilities	169,340		174,051
Sales	0		0
Profit (loss) for the year	14,739		13,720
KOSPO Youngnam Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	393,745		389,071
Total liabilities	292,765		294,408
Sales	318,770		254,966
Profit (loss) for the year	6,339		3,405
VI Carbon Professional Private Special Asset Investment Trust 1
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets			3,006
Total liabilities			4
Sales			0
Profit (loss) for the year			7
Chitose Solar Power Plant LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	125,578		133,643
Total liabilities	109,470		118,783
Sales	16,630		17,073
Profit (loss) for the year	1,794		1,521
KEPCO Energy Solution Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	317,676		313,754
Total liabilities	4,938		4,093
Sales	21,423		5,585
Profit (loss) for the year	3,104		3,656
KEPCO Solar Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	231,567		230,443
Total liabilities	22,229		23,098
Sales	11,305		3,933
Profit (loss) for the year	2,014		1,888
KOSPO Power Services Ltda.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	8,007		4,354
Total liabilities	5,800		1,644
Sales	21,133		10,846
Profit (loss) for the year	(356)		1,011
Energy New Industry Specialized Investment Private Investment Trust
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	336,932	[4]	279,489	[5]
Total liabilities	28,536	[4]	24,173	[5]
Sales	19,405	[4]	23,682	[5]
Profit (loss) for the year	11,116	[4]	8,248	[5]
KOEN Bylong Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	8		6
Total liabilities	86		75
Sales	0		0
Profit (loss) for the year	0		(11)
KOMIPO Bylong Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	8		7
Total liabilities	86		76
Sales	0		0
Profit (loss) for the year	(8)		(11)
KOWEPO Bylong Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	8		6
Total liabilities	86		64
Sales	0		0
Profit (loss) for the year	(18)		0
KOSPO Bylong Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	73		153
Total liabilities	168		213
Sales	0		0
Profit (loss) for the year	(20)		(2)
EWP Bylong Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	8		6
Total liabilities	54		35
Sales	0		0
Profit (loss) for the year	0		28
KOWEPO Lao International
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	12,974		8,982
Total liabilities	70		392
Sales	8,543		8,466
Profit (loss) for the year	5,681		4,706
KEPCO US Inc.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	17,601		16,154
Total liabilities	0		0
Sales	0		0
Profit (loss) for the year	0		(21)
KEPCO Alamosa LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	34,100		31,353
Total liabilities	297		270
Sales	124		127
Profit (loss) for the year	(62)		(237)
KEPCO Solar of Alamosa, LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	57,104		68,336
Total liabilities	41,953		42,910
Sales	8,008		9,096
Profit (loss) for the year	(742)		(2,052)
KEPCO Mangilao Holdings LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	28,504		25,785
Total liabilities	32,501		28,924
Sales	0		0
Profit (loss) for the year	(556)		(502)
Mangilao Investment LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	43,459		38,090
Total liabilities	29		14
Sales	0		0
Profit (loss) for the year	(14)		(15)
KEPCO Mangilao Solar, LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	206,018		69,830
Total liabilities	166,095		34,029
Sales	0		0
Profit (loss) for the year	(865)		(253)
Jeju Hanlim Offshore Wind Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	41,325		20,525
Total liabilities	5,139		9,805
Sales	0		0
Profit (loss) for the year	(2,893)		(3,049)
PT. Siborpa Eco Power
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	11,306		10,491
Total liabilities	0		14
Sales	0		0
Profit (loss) for the year	(105)		(361)
PT. Korea Energy Indonesia
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	1,917		1,746
Total liabilities	215		196
Sales	1,681		2,428
Profit (loss) for the year	37		190
KOLAT SpA
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	28,349		31,109
Total liabilities	849		425
Sales	180		243
Profit (loss) for the year	(464)		(216)
KEPCO California, LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	43,732		41,973
Total liabilities	4,113		4,683
Sales	1,310		0
Profit (loss) for the year	160		(1,330)
KEPCO Mojave Holdings, LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	95,294		95,326
Total liabilities	71,358		67,138
Sales	0		0
Profit (loss) for the year	(4,254)		(4,358)
Incheon Fuel Cell Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	259,111		192,184
Total liabilities	236,901		170,976
Sales	46,034		0
Profit (loss) for the year	962		(979)
KOEN Service Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	8,963		6,239
Total liabilities	6,557		5,598
Sales	35,190		32,150
Profit (loss) for the year	2,326		129
KOMIPO Service Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	4,384		3,381
Total liabilities	4,475		3,649
Sales	32,323		28,596
Profit (loss) for the year	(96)		(479)
KOWEPO Service Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	7,289		6,045
Total liabilities	5,869		4,849
Sales	31,700		29,559
Profit (loss) for the year	303		726
KOSPO Service Co., Ltd
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	5,762		5,617
Total liabilities	4,990		4,708
Sales	26,257		25,103
Profit (loss) for the year	31		832
EWP Service Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	5,483		4,568
Total liabilities	5,455		4,074
Sales	24,957		23,223
Profit (loss) for the year	14		(15)
PT. KOMIPO Energy Indonesia
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	2,996		2,473
Total liabilities	395		154
Sales	2,077		2,391
Profit (loss) for the year	106		52
KNF Partners Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	1,800		1,470
Total liabilities	969		743
Sales	5,664		5,487
Profit (loss) for the year	152		256
KOSPO USA Inc.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	286,081		120,380
Total liabilities	293		266
Sales	0		0
Profit (loss) for the year	968		(1,611)
Nambu USA LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	277,698		42,739
Total liabilities	0		0
Sales	0		0
Profit (loss) for the year	568		544
Tamra Offshore Wind Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	146,736		150,957
Total liabilities	106,961		112,184
Sales	21,731		22,200
Profit (loss) for the year	5,168		4,575
KEPCO MCS Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	80,277		59,227
Total liabilities	39,139		36,786
Sales	349,116		342,053
Profit (loss) for the year	19,043		19,190
KEPCO FMS Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	17,188		14,390
Total liabilities	15,577		12,585
Sales	94,210		89,228
Profit (loss) for the year	214		837
Firstkeepers Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	17,152		13,981
Total liabilities	16,041		12,234
Sales	77,189		68,538
Profit (loss) for the year	19		2,994
Secutec Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	13,176		11,473
Total liabilities	10,662		9,771
Sales	65,963		62,256
Profit (loss) for the year	1,774		1,609
SE Green Energy Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	153,105		152,205
Total liabilities	119,461		122,606
Sales	38,867		19,731
Profit (loss) for the year	4,025		2,463
KEPCO Mangilao America LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	2,173		1,793
Total liabilities	1		0
Sales	0		0
Profit (loss) for the year	0		0
Mangilao Intermediate Holdings LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	220,690		100,609
Total liabilities	205,421		80,210
Sales	0		0
Profit (loss) for the year	(6,975)		(3,708)
KEPCO CSC Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	8,093		8,817
Total liabilities	6,799		5,551
Sales	41,854		38,465
Profit (loss) for the year	(2,101)		2,479
KOAK Power Limited
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	14,363		15,864
Total liabilities	393		1,118
Sales	0		0
Profit (loss) for the year	(551)		607
KOMIPO Europe B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	70,431		43,198
Total liabilities	97		46
Sales	402		333
Profit (loss) for the year	(503)		(386)
Haenanum Energy Fund
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	7,463		28,219
Total liabilities	3		132
Sales	40		128
Profit (loss) for the year	(74)		(13)
Paju Ecoenergy Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	57,795		57,320
Total liabilities	2,118		3,506
Sales	15,425		3,069
Profit (loss) for the year	2,234		247
Guam Ukudu Power LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	30,133		3,165
Total liabilities	30,438		3,589
Sales	0		0
Profit (loss) for the year	(2,030)		(1,577)
TS Energy No. 25 Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	353,324		184,667
Total liabilities	318,977		142,709
Sales	421		0
Profit (loss) for the year	(7,525)		(3,779)
KPS Partners Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	2,809		2,139
Total liabilities	1,529		1,127
Sales	9,520		3,562
Profit (loss) for the year	323		313
KEPCO E&C Service Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	4,054		2,514
Total liabilities	1,889		1,549
Sales	15,985		4,989
Profit (loss) for the year	1,242		464
Moha Solar Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	32,808		7,390
Total liabilities	33,933		7,809
Sales	48		0
Profit (loss) for the year	(706)		(364)
Ogiri Solar Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	1,041		1,032
Total liabilities	1		0
Sales	0		0
Profit (loss) for the year	9		0
KHNP USA LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	766		464
Total liabilities	10		23
Sales	1,001		229
Profit (loss) for the year	267		119
KOMIPO Vanphong Power Service LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	3,758		1,727
Total liabilities	860		12
Sales	3,853		0
Profit (loss) for the year	958		(34)
Energy Innovation Fund I
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	22,616		8,412
Total liabilities	3,202		1
Sales	0		25
Profit (loss) for the year	(888)		₩ (201)
KHNP Chile SpA
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	5,294
Total liabilities	3,879
Sales	0
Profit (loss) for the year	17
Yeong Yang Apollon Photovoltaic Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	1,775
Total liabilities	1,632
Sales	5
Profit (loss) for the year	(30)
Yeong Yang Corporation Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	1,776
Total liabilities	1,623
Sales	9
Profit (loss) for the year	(19)
SolarVader Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	1,772
Total liabilities	1,627
Sales	0
Profit (loss) for the year	(26)
Yeong Yang Innovation Co., Ltd. [Member]
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	1,773
Total liabilities	1,622
Sales	5
Profit (loss) for the year	(21)
Yeong Yang Horus Photovoltaic Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	1,771
Total liabilities	1,624
Sales	9
Profit (loss) for the year	(24)
Yeong Yang Solar Management Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	1,774
Total liabilities	1,625
Sales	0
Profit (loss) for the year	(23)
LSG Hydro Power Limited
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	1
Total liabilities	0
Sales	0
Profit (loss) for the year	0
KOEN Bio Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	394
Total liabilities	199
Sales	51
Profit (loss) for the year	(305)
KOMIPO Iberian Solar Group, S.L.U.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	70,993
Total liabilities	56,707
Sales	0
Profit (loss) for the year	1,354
Jeongam Wind Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	86,853
Total liabilities	74,267
Sales	10,476
Profit (loss) for the year	1,027
KOWEPO Europe B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	39,973
Total liabilities	1,449
Sales	0
Profit (loss) for the year	(744)
Yeongdeok Sunrise Wind Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	21,252
Total liabilities	768
Sales	0
Profit (loss) for the year	(116)
KHNP Spain, S.L.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	5
Total liabilities	0
Sales	0
Profit (loss) for the year	₩ 0
[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 EWP America Inc. includes that of four other subsidiaries, EWP Renewable Corporation, DG Fairhaven Power, LLC, 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 four other subsidiaries, BSK E-New Industry Fund VII, e-New Industry LB Fund 1, Songhyun e-New Industry Fund and BSK E-New Industry Fund X.
[5]	Financial information of Energy New Industry Specialized Investment Private Investment Trust includes that of four other subsidiaries, BSK E-New Industry Fund VII, e-New Industry LB Fund 1, Songhyun e-New Industry Fund and BSK E-New Industry Fund X.

Consolidated Subsidiaries - S_4

Consolidated Subsidiaries - Summary of Significant Restrictions on Abilities to Subsidiaries (Details) ₩ in Billions	12 Months Ended
	Dec. 31, 2021KRW (₩)
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
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
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. The Company’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. The Company’s shares cannot be wholly or partially transferred without prior consent of other stakeholders including shareholders or financial institutions.
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 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.
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.

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, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]
Current assets of subsidiaries	₩ 2,312,226	₩ 2,029,674	₩ 2,075,884
Non-current assets of subsidiaries	4,931,883	4,638,564	4,421,596
Current liabilities of subsidiaries	(1,078,273)	(867,786)	(933,560)
Non-current liabilities of subsidiaries	(2,729,199)	(2,602,653)	(2,304,159)
Net assets of subsidiaries	3,436,637	3,197,799	3,259,761
Book value of non-controlling interest	1,542,839	1,370,166	1,393,331
Sales of subsidiaries	3,147,175	2,769,001	2,643,343
Profit for the year of subsidiaries	248,053	253,180	175,990
Profit for the year attributable to non-controlling interest of subsidiaries	85,830	101,122	81,982
Cash flows from operating activities of subsidiaries	528,862	452,206	512,611
Cash flows from investing activities of subsidiaries	(319,569)	(661,844)	(393,916)
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries	(2,308)	282,681	75,591
Dividends to non-controlling interests of subsidiaries	(31,516)	(81,298)	(99,256)
Effect of exchange rate fluctuation of subsidiaries	18,849	(18,239)	4,005
Net increase (decrease) of cash and cash equivalents of subsidiaries	₩ 194,318	₩ (26,494)	₩ 99,035
KEPCO Ilijan Corporation
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]
Percentage of ownership	49.00%	49.00%	49.00%
Current assets of subsidiaries	₩ 234,224	₩ 236,602	₩ 173,931
Non-current assets of subsidiaries	24,845	85,464	197,446
Current liabilities of subsidiaries	(30,783)	(12,322)	(11,990)
Non-current liabilities of subsidiaries	(7,772)	(34,912)	(44,166)
Net assets of subsidiaries	220,514	274,832	315,221
Book value of non-controlling interest	108,052	134,668	154,458
Sales of subsidiaries	60,532	81,400	95,072
Profit for the year of subsidiaries	12,981	39,443	40,818
Profit for the year attributable to non-controlling interest of subsidiaries	6,361	19,327	20,001
Cash flows from operating activities of subsidiaries	116,440	121,835	101,707
Cash flows from investing activities of subsidiaries	2,216	7,561	4,458
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries	(88,927)	(31,793)	(68,678)
Dividends to non-controlling interests of subsidiaries	0	(30,319)	(48,750)
Effect of exchange rate fluctuation of subsidiaries	10,683	(8,153)	2,111
Net increase (decrease) of cash and cash equivalents of subsidiaries	₩ 40,412	₩ 59,131	₩ (9,152)
KEPCO Plant Service & Engineering Co., Ltd.
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]
Percentage of ownership	49.00%	49.00%	49.00%
Current assets of subsidiaries	₩ 793,995	₩ 755,454	₩ 779,764
Non-current assets of subsidiaries	626,710	590,403	577,219
Current liabilities of subsidiaries	(265,017)	(254,495)	(247,737)
Non-current liabilities of subsidiaries	(46,590)	(42,020)	(47,020)
Net assets of subsidiaries	1,109,098	1,049,342	1,062,226
Book value of non-controlling interest	543,458	514,177	520,491
Sales of subsidiaries	1,375,668	1,299,186	1,244,613
Profit for the year of subsidiaries	98,132	85,916	157,737
Profit for the year attributable to non-controlling interest of subsidiaries	48,085	42,099	77,291
Cash flows from operating activities of subsidiaries	133,160	74,159	164,373
Cash flows from investing activities of subsidiaries	(39,444)	26,748	(89,159)
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries	(30,599)	(47,809)	(44,332)
Dividends to non-controlling interests of subsidiaries	(25,269)	(42,336)	(39,466)
Effect of exchange rate fluctuation of subsidiaries	885	(2,171)	(593)
Net increase (decrease) of cash and cash equivalents of subsidiaries	₩ 38,733	₩ 8,591	₩ (9,177)
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 of subsidiaries	₩ 253,958	₩ 235,805	₩ 257,593
Non-current assets of subsidiaries	451,085	463,439	477,614
Current liabilities of subsidiaries	(183,100)	(186,296)	(223,522)
Non-current liabilities of subsidiaries	(8,492)	(13,873)	(19,472)
Net assets of subsidiaries	513,451	499,075	492,213
Book value of non-controlling interest	174,163	169,286	166,959
Sales of subsidiaries	433,127	431,723	448,635
Profit for the year of subsidiaries	16,452	20,160	26,398
Profit for the year attributable to non-controlling interest of subsidiaries	5,581	6,838	8,954
Cash flows from operating activities of subsidiaries	(16,270)	15,225	27,081
Cash flows from investing activities of subsidiaries	19,061	(34,333)	47,219
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries	(8,467)	(9,165)	(34,632)
Dividends to non-controlling interests of subsidiaries	(3,639)	(4,000)	(1,807)
Effect of exchange rate fluctuation of subsidiaries	38	(22)	(14)
Net increase (decrease) of cash and cash equivalents of subsidiaries	(9,277)	(32,295)	37,847
Others
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]
Current assets of subsidiaries	1,030,049	801,813	864,596
Non-current assets of subsidiaries	3,829,243	3,499,258	3,169,317
Current liabilities of subsidiaries	(599,373)	(414,673)	(450,311)
Non-current liabilities of subsidiaries	(2,666,345)	(2,511,848)	(2,193,501)
Net assets of subsidiaries	1,593,574	1,374,550	1,390,101
Book value of non-controlling interest	717,166	552,035	551,423
Sales of subsidiaries	1,277,848	956,692	855,023
Profit for the year of subsidiaries	120,488	107,661	(48,963)
Profit for the year attributable to non-controlling interest of subsidiaries	25,803	32,858	(24,264)
Cash flows from operating activities of subsidiaries	295,532	240,987	219,450
Cash flows from investing activities of subsidiaries	(301,402)	(661,820)	(356,434)
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries	125,685	371,448	223,233
Dividends to non-controlling interests of subsidiaries	(2,608)	(4,643)	(9,233)
Effect of exchange rate fluctuation of subsidiaries	7,243	(7,893)	2,501
Net increase (decrease) of cash and cash equivalents of subsidiaries	₩ 124,450	₩ (61,921)	₩ 79,517

Consolidated Subsidiaries - S_6

Consolidated Subsidiaries - Summary of Changes in Goodwill (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill	₩ 105,647	₩ 98,166
Goodwill, Beginning	98,166	97,977
Increase	7,482	189
Decrease	0	0
Goodwill, Ending	105,647	98,166
Acquisition cost
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill	105,647	98,166
Goodwill, Beginning	98,166	97,977
Increase	7,481	189
Decrease	0	0
Goodwill, Ending	105,647	98,166
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

Consolidated Subsidiaries - S_7

Consolidated Subsidiaries - Summary of Cash Dividends Received from Subsidiaries (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Subsidiaries
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	₩ 454,255	₩ 362,162	₩ 353,310
Korea Hydro & Nuclear Power Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	279,779	106,675	0
Korea South-East Power Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	11,905	7,143
Korea Midland Power Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	0	0
Korea Western Power Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	0	0
Korea Southern Power Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	0	15,277
Korea East-West Power Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	17,959	985
KEPCO Engineering & Construction Company, Inc.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	7,089	7,793	3,519
KEPCO Plant Service & Engineering Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	26,301	44,068	41,084
KEPCO Nuclear Fuel Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	5,206	7,270	4,219
KEPCO KDN Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	18,854	14,720	19,136
KEPCO International HongKong Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	11,858	10,243
KEPCO International Philippines Inc.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	0	70,480
KEPCO Ilijan Corporation
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	7,955	34,502	65,776
KEPCO Philippines Holdings Inc.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	60,520	70,876	63,522
KOSEP Australia Pty., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	1,856	8,120
KOSPO Australia Pty., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	3,095	0	4,335
Qatrana Electric Power Company
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	2,615	0	10,313
KEPCO KPS Philippines Corp.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	1,215	3,854
Tamra Offshore Wind Power Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	2,640	4,823
KEPCO Netherlands S3 B.V.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	6,981	874
PT. KOMIPO Pembangkitan Jawa Bali
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	153	0	1,971
KEPCO Netherlands J3 B.V.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	27,237	0	0
Gyeongju Wind Power Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	2,800	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	7	11
KOSPO Power Services Ltda.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	0	745
KEPCO Netherlands B.V.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	11,098	13,266
PT. Cirebon Power Service
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	221	0
Chitose Solar Power Plant LLC
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	858	814
Fujeij Wind Power Company
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	11,920	6,306	0
KOSPO Jordan LLC
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	731	535	0
Energy Innovation Fund I
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	₩ 0	₩ 19	₩ 0

Investments in Associates 1 (De

Investments in Associates 1 (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Disclosure of associates [line items]
Acquisition cost		₩ 3,059,835		₩ 2,481,761
Book value		₩ 5,232,373		₩ 4,250,787		₩ 4,251,802
Korea Gas Corporation
Disclosure of associates [line items]
Key operation activities		Importing and wholesaling LNG		Importing and wholesaling LNG	[1]
Location		Korea		Korea
Percentage of ownership		20.47%		20.47%	[1]
Acquisition cost		₩ 94,500		₩ 94,500	[1]
The fair value of associates		738,990		584,010
Book value		₩ 1,815,513		₩ 1,647,325	[1]	1,693,967
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		29.00%		29.00%
Acquisition cost		₩ 4,727		₩ 4,727
The fair value of associates		115,339		45,048
Book value		₩ 24,617		₩ 25,630		25,393
YTN Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Broadcasting		Broadcasting
Location		Korea		Korea
Percentage of ownership		21.43%		21.43%
Acquisition cost		₩ 59,000		₩ 59,000
The fair value of associates		26,550		27,000
Book value		₩ 51,828		₩ 40,549		39,747
Gangwon Wind Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Korea		Korea
Percentage of ownership		15.00%		15.00%
Acquisition cost		₩ 5,725		₩ 5,725
Book value		₩ 10,554		₩ 11,443		12,327
Hyundai Green Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation equipment consignment and operation service		Power generation
Location		Korea		Korea
Percentage of ownership		29.00%		29.00%
Acquisition cost		₩ 88,885		₩ 88,885
Book value		₩ 121,955		₩ 132,774		124,253
Korea Power Exchange
Disclosure of associates [line items]
Key operation activities		Management of power market and others		Management of power market and others
Location		Korea		Korea
Percentage of ownership		100.00%		100.00%
Acquisition cost		₩ 127,839		₩ 127,839
Book value		269,728		269,122		258,899
Dayone Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.)
Disclosure of associates [line items]
Unrecognized equity interest		(1,244)		(14,035)
Accumulated unrecognized equity interest		₩ 23,452		₩ 24,696
Taebaek Wind Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Korea		Korea
Percentage of ownership		25.00%		25.00%
Acquisition cost		₩ 3,810		₩ 3,810
Book value		₩ 6,800		₩ 6,392		7,039
Taeback Guinemi Wind Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Korea		Korea
Percentage of ownership		25.00%		25.00%
Acquisition cost		₩ 3,420		₩ 3,420
Book value		₩ 3,357		₩ 3,087		2,553
Pyeongchang Wind Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Korea		Korea
Percentage of ownership		25.00%		25.00%
Acquisition cost		₩ 3,875		₩ 3,875
Book value		₩ 5,411		₩ 5,027		5,877
Daeryun Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Korea		Korea
Percentage of ownership		9.34%		9.34%
Acquisition cost		₩ 40,854		₩ 40,854
Book value		₩ 25,426		₩ 26,353		26,247
Changjuk Wind Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Korea		Korea
Percentage of ownership		30.00%		30.00%
Acquisition cost		₩ 3,801		₩ 3,801
Book value		₩ 8,355		₩ 7,867		8,520
KNH Solar Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Korea		Korea
Percentage of ownership		27.00%		27.00%
Acquisition cost		₩ 1,296		₩ 1,296
Book value		₩ 2,278		₩ 2,436		2,382
SPC Power Corporation
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Philippines		Philippines
Percentage of ownership		38.00%		38.00%
Acquisition cost		₩ 20,635		₩ 20,635
The fair value of associates		203,589		139,698
Book value		₩ 65,046		₩ 69,912		63,583
Gemeng International Energy Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		China		China
Percentage of ownership		34.00%		34.00%
Acquisition cost		₩ 413,153		₩ 413,153
Book value		₩ 595,218		₩ 679,708		670,896
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		₩ 121,969		₩ 117,811		123,425
KNOC Nigerian East Oil Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Resources development		Resources development
Location		Nigeria		Nigeria
Percentage of ownership		14.63%		14.63%
Acquisition cost		₩ 12		₩ 12
Book value		₩ 0		₩ 0		0
KNOC Nigerian West Oil Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Resources development		Resources development
Location		Nigeria		Nigeria
Percentage of ownership		14.63%		14.63%
Acquisition cost		₩ 12		₩ 12
Book value		₩ 0		₩ 0		0
PT Wampu Electric Power
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Indonesia		Indonesia
Percentage of ownership		46.00%		46.00%
Acquisition cost		₩ 21,292		₩ 21,292
Book value		₩ 35,077		₩ 27,865		29,355
PT. Bayan Resources TBK
Disclosure of associates [line items]
Key operation activities		Resources development		Resources development
Location		Indonesia		Indonesia
Percentage of ownership		20.00%		20.00%
Acquisition cost		₩ 615,860		₩ 615,860
The fair value of associates		1,495,801		798,510
Book value		₩ 661,289		₩ 425,234		445,141
S-Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Korea		Korea
Percentage of ownership		49.00%		49.00%
Acquisition cost		₩ 132,300		₩ 132,300
Book value		₩ 122,786		₩ 110,292		115,784
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		21,691		15,824
Accumulated unrecognized equity interest		₩ 37,629		₩ 15,938
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		40.00%		40.00%
Acquisition cost		₩ 461		₩ 461
Book value		0		0		0
Unrecognized equity interest		15		(10)
Accumulated unrecognized equity interest		₩ 190		₩ 175
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		25.00%		25.00%
Acquisition cost		₩ 87,426		₩ 87,426
Book value		92,441		₩ 64,570		72,935
Hadong Mineral Fiber Co., Ltd.
Disclosure of associates [line items]
Key operation activities				Recycling fly ashes
Location				Korea
Percentage of ownership				8.33%
Acquisition cost				₩ 50
Book value		0		0		0
Unrecognized equity interest		0		0
Accumulated unrecognized equity interest		₩ 0		₩ 2
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		29.00%		29.00%
Acquisition cost		₩ 2,978		₩ 2,978
Book value		₩ 2,569		₩ 1,780		1,438
Samcheok Eco Materials Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Recycling fly ashes		Recycling fly ashes
Location		Korea		Korea
Percentage of ownership		2.35%		2.35%
Acquisition cost		₩ 686		₩ 686
Book value		₩ 0		₩ 0		0
Noeul Green Energy Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Korea		Korea
Percentage of ownership		29.00%		29.00%
Acquisition cost		₩ 1,740		₩ 1,740
Book value		3,808		4,197		6,610
Naepo Green Energy Co., Ltd.
Disclosure of associates [line items]
Book value				0		0
Unrecognized equity interest		5,469		(7,003)
Accumulated unrecognized equity interest		₩ 7,747		₩ 2,278
Goseong Green Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Korea		Korea
Percentage of ownership		29.00%		1.12%
Acquisition cost		₩ 262,740		₩ 2,900
Book value		₩ 260,858		₩ 2,186		2,340
Gangneung Eco Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Korea		Korea
Percentage of ownership		1.61%		1.61%
Acquisition cost		₩ 2,900		₩ 2,900
Book value		₩ 2,288		₩ 2,368		2,430
Shin Pyeongtaek Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Korea		Korea
Percentage of ownership		40.00%		40.00%
Acquisition cost		₩ 72,000		₩ 72,000
Book value		₩ 93,074		₩ 69,591		66,956
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		28.00%		28.00%
Acquisition cost		₩ 194		₩ 194
Book value		₩ 223		₩ 210		215
Dongducheon Dream Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Korea		Korea
Percentage of ownership		33.61%		33.61%
Acquisition cost		₩ 148,105		₩ 148,105
Book value		₩ 74,198		₩ 80,637		76,547
Jinbhuvish Power Generation Pvt. Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		India		India
Percentage of ownership		5.16%		5.16%
Acquisition cost		₩ 9,000		₩ 9,000
Book value		₩ 0		₩ 0		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		₩ 1,704		₩ 2,165		2,361
GS Donghae Electric Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Korea		Korea
Percentage of ownership		34.00%		34.00%
Acquisition cost		₩ 204,000		₩ 204,000
Book value		₩ 243,772		₩ 244,426		255,983
Daegu Photovoltaic Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Korea		Korea
Percentage of ownership		29.00%		29.00%
Acquisition cost		₩ 1,230		₩ 1,230
Book value		₩ 2,342		₩ 2,066		2,060
Busan Green Energy Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Korea		Korea
Percentage of ownership		29.00%		29.00%
Acquisition cost		₩ 5,243		₩ 5,243
Book value		₩ 5,032		₩ 8,778		10,637
Gunsan Bio Energy Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Korea		Korea
Percentage of ownership		18.87%		18.87%
Acquisition cost		₩ 1,000		₩ 1,000
Book value		0		0		0
Unrecognized equity interest		282		290
Accumulated unrecognized equity interest		₩ 3,864		₩ 3,582
Korea Electric Vehicle Charging Service
Disclosure of associates [line items]
Key operation activities		Electric vehicle charge service		Electric vehicle charge service
Location		Korea		Korea
Percentage of ownership		17.50%		28.00%
Acquisition cost		₩ 2,800		₩ 2,800
Book value		₩ 1,250		₩ 576		1,063
Hansuwon KNP Co., Ltd. (formerly, Korea Nuclear Partners Co., Ltd.) [Member]
Disclosure of associates [line items]
Key operation activities		Electric material agency
Location		Korea
Percentage of ownership		28.98%
Acquisition cost		₩ 537
Book value		₩ 219
Korea Nuclear Partners Co., Ltd.
Disclosure of associates [line items]
Key operation activities				Electric material agency
Location				Korea
Percentage of ownership				28.98%
Acquisition cost				₩ 537
Book value				₩ 200		0
Korea Electric Power Corporation Fund
Disclosure of associates [line items]
Key operation activities		Developing electric enterprises		Developing electric enterprises
Location		Korea		Korea
Percentage of ownership		98.09%		98.09%
Acquisition cost		₩ 48,410		₩ 51,500
Book value		₩ 47,983		₩ 41,926		41,126
Energy Infra Asset Management Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Asset management		Asset management
Location		Korea		Korea
Percentage of ownership		9.90%		9.90%
Acquisition cost		₩ 297		₩ 297
Book value		₩ 1,066		₩ 938		791
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		28.00%		28.00%
Acquisition cost		₩ 140		₩ 140
Book value		₩ 12		₩ 12		13
Yaksu ESS Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Installing ESS related equipment		Installing ESS related equipment
Location		Korea		Korea
Percentage of ownership		29.00%		29.00%
Acquisition cost		₩ 210		₩ 210
Book value		₩ 716		₩ 454		516
Nepal Water & Energy Development Company Private Ltd
Disclosure of associates [line items]
Key operation activities		Construction and operation of utility plant		Construction and operation of utility plant
Location		Nepal		Nepal
Percentage of ownership		69.06%		60.35%
Acquisition cost		₩ 70,228		₩ 50,268
Book value		₩ 66,333		₩ 42,677		31,145
Gwangyang Green Energy Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Korea		Korea
Percentage of ownership		20.00%		20.00%
Acquisition cost		₩ 26,800		₩ 2,000
Book value		₩ 25,466		₩ 926		948
PND Solar Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Korea		Korea
Percentage of ownership		29.00%		29.00%
Acquisition cost		₩ 1,250		₩ 1,250
Book value		₩ 1,229		₩ 1,149		1,144
Hyundai Ecoenergy Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Korea		Korea
Percentage of ownership		19.00%		19.00%
Acquisition cost		₩ 3,610		₩ 3,610
Book value		₩ 5,572		₩ 4,250		3,781
YeongGwang Yaksu Wind Electric Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Korea		Korea
Percentage of ownership		9.63%		9.63%
Acquisition cost		₩ 533		₩ 533
Book value		₩ 233		₩ 312		386
Green Energy Electricity Generation Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Korea		Korea
Percentage of ownership		29.00%		29.00%
Acquisition cost		₩ 1,189		₩ 1,189
Book value		₩ 1,713		₩ 25		163
Korea Energy Solution Co., Ltd.
Disclosure of associates [line items]
Key operation activities		R & D		R & D
Location		Korea		Korea
Percentage of ownership		20.00%		20.00%
Acquisition cost		₩ 300		₩ 300
Book value		₩ 123		₩ 197		259
ITR Co., Ltd.
Disclosure of associates [line items]
Key operation activities		R & D		R & D
Location		Korea		Korea
Percentage of ownership		20.00%		20.00%
Acquisition cost		₩ 50		₩ 50
Book value		₩ 32		₩ 40		33
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		20.00%		20.00%
Acquisition cost		₩ 25		₩ 25
Book value		₩ 306		₩ 27		21
Namjeongsusang Solar Power Operation Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Korea		Korea
Percentage of ownership		15.00%		15.00%
Acquisition cost		₩ 969		₩ 969
Book value		₩ 361		₩ 103		812
Indeck Niles Development, LLC
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		USA		USA
Percentage of ownership		56.25%	[2]	24.08%
Acquisition cost		₩ 268,113	[2]	₩ 45,562
Book value		₩ 246,273	[2]	₩ 20,627		0
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		₩ 111		₩ 101		87
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		49.00%		49.00%
Acquisition cost		₩ 7,112		₩ 7,300
Book value		₩ 7,138		₩ 7,326		7,126
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		₩ 1,035		₩ 1,054		798
KPGE Inc.
Disclosure of associates [line items]
Key operation activities		Power generation materials business		Power generation materials business
Location		Korea		Korea
Percentage of ownership		29.00%		29.00%
Acquisition cost		₩ 287		₩ 287
Book value		₩ 309		₩ 287		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		44.00%		44.00%
Acquisition cost		₩ 4,757		₩ 4,757
Book value		₩ 4,806		₩ 4,682		2,054
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		40.00%		61.00%
Acquisition cost		₩ 5,560		₩ 1,830
Book value		₩ 4,302		₩ 960
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		₩ 128		₩ 85		0
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		₩ 7		₩ 14		0
Hankook Electric Power Information Co., Ltd.
Disclosure of associates [line items]
Key operation activities		R & D		R & D
Location		Korea		Korea
Percentage of ownership		25.25%		25.25%
Acquisition cost		₩ 38		₩ 38
Book value		₩ 161		₩ 139		0
Tronix Co., Ltd.
Disclosure of associates [line items]
Key operation activities		R & D		R & D
Location		Korea		Korea
Percentage of ownership		20.00%		20.00%
Acquisition cost		₩ 75		₩ 75
Book value		₩ 109		₩ 119		0
O2&B Global Co., Ltd.
Disclosure of associates [line items]
Key operation activities		R & D		R & D
Location		Korea		Korea
Percentage of ownership		20.00%		20.00%
Acquisition cost		₩ 25		₩ 25
Book value		₩ 35		₩ 22		0
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		20.00%		20.00%
Acquisition cost		₩ 1,570		₩ 1,570
Book value		₩ 1,268		₩ 1,096		0
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		182		116
Accumulated unrecognized equity interest		298		₩ 116
Jeju SolarOne Co., Ltd.
Disclosure of associates [line items]
Key operation activities				Power generation
Location				Korea
Percentage of ownership				10.00%
Acquisition cost				₩ 161
Book value		₩ 0		₩ 159		0
Goesan Solar Park Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Korea		Korea
Percentage of ownership		29.00%		29.00%
Acquisition cost		₩ 1,276		₩ 1,276
Book value		₩ 1,927		₩ 1,684		0
Saemangeum Heemang Photovoltaic Co.,Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Korea		Korea
Percentage of ownership		35.00%		35.00%
Acquisition cost		₩ 11,022		₩ 11,022
Book value		₩ 10,238		₩ 11,022		0
Bitgoel Eco Energy Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Korea		Korea
Percentage of ownership		29.00%		29.00%
Acquisition cost		₩ 4,640		₩ 29
Book value		₩ 4,356		₩ 29		0
Jeju Gimnyeong Wind Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Korea		Korea
Percentage of ownership		30.00%		30.00%
Acquisition cost		₩ 714		₩ 714
Book value		₩ 911		₩ 1,578		0
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%		19.46%
Acquisition cost		₩ 706		₩ 230
Book value		₩ 721		₩ 230		0
Muan Solar Park Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Korea		Korea
Percentage of ownership		20.00%		19.00%
Acquisition cost		₩ 4,400		₩ 4,180
Book value		₩ 6,083		₩ 4,180		0
YuDang Solar Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation		Power generation
Location		Korea		Korea
Percentage of ownership		20.00%		20.00%
Acquisition cost		₩ 360		₩ 360
Book value		₩ 565		₩ 360		0
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		20.00%		19.50%
Acquisition cost		₩ 5,651		₩ 5,510
Book value		₩ 6,784		₩ 5,510		0
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		3,877		3,910		₩ 0
Samcheok Eco Materials Co., Ltd
Disclosure of associates [line items]
Unrecognized equity interest		(323)		(3)
Accumulated unrecognized equity interest		₩ 462		785
G.GURU Co., Ltd.
Disclosure of associates [line items]
Key operation activities		R & D
Location		Korea
Percentage of ownership		24.65%
Acquisition cost		₩ 493
Book value		₩ 403
UD4M Co., Ltd.
Disclosure of associates [line items]
Key operation activities	[3]	R & D
Location		Korea
Percentage of ownership	[3]	12.50%
Acquisition cost	[3]	₩ 75
Book value	[3]	₩ 144
Dongbu Highway Solar Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation
Location		Korea
Percentage of ownership		20.00%
Acquisition cost		₩ 190
Book value		₩ 265
Seobu Highway Solar Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation
Location		Korea
Percentage of ownership		20.00%
Acquisition cost		₩ 195
Book value		₩ 289
Korea Energy Data Co., Ltd.
Disclosure of associates [line items]
Key operation activities		R & D
Location		Korea
Percentage of ownership		29.37%
Acquisition cost		₩ 60
Book value		₩ 62		0
Gangneung Sacheon Fuel Cell Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation
Location		Korea
Percentage of ownership	[4]	65.00%
Acquisition cost	[4]	₩ 1,950
Book value	[4]	₩ 1,878
KOSTURE Co., Ltd.
Disclosure of associates [line items]
Key operation activities	[3]	Coal recycling business
Location		Korea
Percentage of ownership	[3]	0.26%
Acquisition cost	[3]	₩ 0
Book value	[3]	₩ 0
Digital Innovation Growth Fund
Disclosure of associates [line items]
Key operation activities	[5]	Holding company
Location		Korea
Percentage of ownership	[5]	76.92%
Acquisition cost	[5]	₩ 10,000
Book value		₩ 9,890	[5]	0
Taebaek Gadeoksan Wind Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation
Location		Korea
Percentage of ownership		39.65%
Acquisition cost		₩ 12,570
Book value		₩ 16,495		0
Chuncheon Green Energy Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation
Location		Korea
Percentage of ownership	[6]	68.00%
Acquisition cost	[6]	₩ 3,400
Book value		₩ 3,372	[6]	0
Yeomsubong Wind Power Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation
Location		Korea
Percentage of ownership		48.72%
Acquisition cost		₩ 95
Book value		₩ 95		0
Yeongyang Wind Power Corporation II
Disclosure of associates [line items]
Key operation activities		Power generation
Location		Korea
Percentage of ownership		30.00%
Acquisition cost		₩ 7,965
Book value		₩ 7,965		0
Haeparang Energy Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation
Location		Korea
Percentage of ownership		25.00%
Acquisition cost		₩ 2,241
Book value		₩ 2,241		0
Saemangeum Sebit Power Plant Co., Ltd.
Disclosure of associates [line items]
Key operation activities		Power generation
Location		Korea
Percentage of ownership	[6]	69.55%
Acquisition cost	[6]	₩ 6,000
Book value		6,000	[6]	0
Daehan Wind Power PSC
Disclosure of associates [line items]
Unrecognized equity interest		(3,855)		3,855
Accumulated unrecognized equity interest		0		3,855
Nghi Son 2 Power LLC
Disclosure of associates [line items]
Unrecognized equity interest		(114,340)		30,456
Accumulated unrecognized equity interest		18,940		133,280
Barakah One Company
Disclosure of associates [line items]
Unrecognized equity interest		(26,502)		(46,758)
Accumulated unrecognized equity interest		42,836		69,338
Incheon New Power Co., Ltd.
Disclosure of associates [line items]
Unrecognized equity interest		(31)		194
Accumulated unrecognized equity interest		163		194
KAPES, Inc.
Disclosure of associates [line items]
Unrecognized equity interest		317		3,198
Accumulated unrecognized equity interest		3,515		3,198
Chester Solar IV SpA
Disclosure of associates [line items]
Unrecognized equity interest		21		0
Accumulated unrecognized equity interest		₩ 21		₩ 0
[1]	The effective percentage of ownership is 22.02% considering treasury stocks.
[2]	According to the shareholders’ agreement, additional investment of 50% of total stake is agreed by March 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 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.
[5]	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.
[6]	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.

Investments in Associates 2 (De

Investments in Associates 2 (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021		Dec. 31, 2020
Book value
Beginning balance	₩ 4,250,787		₩ 4,251,802
Acquisition	568,653		96,255
Disposal	(3,484)		(207)
Dividends received	(148,395)		(98,175)
Share of profit (loss)	417,123		59,092
Other comprehensive income (loss)	161,751		(48,911)
Others (book value)	(14,062)		(9,069)
Ending balance	5,232,373		4,250,787
Korea Gas Corporation
Book value
Beginning balance	1,647,325	[1]	1,693,967
Acquisition	0		0
Disposal	0		0
Dividends received	0		(7,182)
Share of profit (loss)	209,357		(14,104)
Other comprehensive income (loss)	13,017		(25,023)
Others (book value)	(54,186)		(333)
Ending balance	1,815,513		1,647,325	[1]
Korea Electric Power Industrial Development Co., Ltd.
Book value
Beginning balance	25,630		25,393
Acquisition	0		0
Disposal	0		0
Dividends received	(1,966)		(2,146)
Share of profit (loss)	378		3,806
Other comprehensive income (loss)	0		0
Others (book value)	575		(1,423)
Ending balance	24,617		25,630
YTN Co., Ltd.
Book value
Beginning balance	40,549		39,747
Acquisition	0		0
Disposal	0		0
Dividends received	(270)		(90)
Share of profit (loss)	11,192		1,086
Other comprehensive income (loss)	22		(6)
Others (book value)	335		(188)
Ending balance	51,828		40,549
Cheongna Energy Co., Ltd.
Book value
Beginning balance	0		1,411
Acquisition			990
Disposal			0
Dividends received			0
Share of profit (loss)			2,518
Other comprehensive income (loss)			0
Others (book value)			(4,919)
Ending balance			0
Gangwon Wind Power Co., Ltd.
Book value
Beginning balance	11,443		12,327
Acquisition	0		0
Disposal	0		0
Dividends received	(1,703)		(1,988)
Share of profit (loss)	814		1,104
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	10,554		11,443
Hyundai Green Power Co., Ltd.
Book value
Beginning balance	132,774		124,253
Acquisition	0		0
Disposal	0		0
Dividends received	(8,888)		(8,889)
Share of profit (loss)	(562)		17,410
Other comprehensive income (loss)	(1,346)		0
Others (book value)	(23)		0
Ending balance	121,955		132,774
Korea Power Exchange
Book value
Beginning balance	269,122		258,899
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	(10)		1,860
Other comprehensive income (loss)	0		1
Others (book value)	616		8,362
Ending balance	269,728		269,122
DAYONE ENERGY Co., Ltd. (formerly, Hyundai Energy 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 (book value)			0
Ending balance			0
Ecollite 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 (book value)			0
Ending balance			0
Taebaek Wind Power Co., Ltd.
Book value
Beginning balance	6,392		7,039
Acquisition	0		0
Disposal	0		0
Dividends received	0		(175)
Share of profit (loss)	408		(472)
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	6,800		6,392
Taeback Guinemi Wind Power Co., Ltd.
Book value
Beginning balance	3,087		2,553
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	270		534
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	3,357		3,087
Pyeongchang Wind Power Co., Ltd.
Book value
Beginning balance	5,027		5,877
Acquisition	0		0
Disposal	0		0
Dividends received	0		(813)
Share of profit (loss)	384		(37)
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	5,411		5,027
Daeryun Power Co., Ltd.
Book value
Beginning balance	26,353		26,247
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	(927)		104
Other comprehensive income (loss)	0		0
Others (book value)	0		2
Ending balance	25,426		26,353
Changjuk Wind Power Co., Ltd.
Book value
Beginning balance	7,867		8,520
Acquisition	0		0
Disposal	0		0
Dividends received	(449)		(750)
Share of profit (loss)	937		97
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	8,355		7,867
KNH Solar Co., Ltd.
Book value
Beginning balance	2,436		2,382
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	(158)		54
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	2,278		2,436
SPC Power Corporation
Book value
Beginning balance	69,912		63,583
Acquisition	0		0
Disposal	0		0
Dividends received	(20,468)		(10,764)
Share of profit (loss)	5,311		5,491
Other comprehensive income (loss)	10,291		11,649
Others (book value)	0		(47)
Ending balance	65,046		69,912
Gemeng International Energy Co., Ltd.
Book value
Beginning balance	679,708		670,896
Acquisition	0		0
Disposal	0		0
Dividends received	(11,886)		(11,620)
Share of profit (loss)	(154,930)		15,965
Other comprehensive income (loss)	82,326		4,468
Others (book value)	0		(1)
Ending balance	595,218		679,708
PT. Cirebon Electric Power
Book value
Beginning balance	117,811		123,425
Acquisition	0		0
Disposal	0		0
Dividends received	(18,253)		(9,782)
Share of profit (loss)	10,679		11,330
Other comprehensive income (loss)	1,396		434
Others (book value)	10,336		(7,596)
Ending balance	121,969		117,811
KNOC Nigerian East Oil Co., Ltd.
Book value
Beginning balance	0		0
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	(14)		(22)
Other comprehensive income (loss)	(938)		671
Others (book value)	952		(649)
Ending balance	0		0
KNOC Nigerian West Oil Co., Ltd.
Book value
Beginning balance	0		0
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	(15)		(22)
Other comprehensive income (loss)	(862)		617
Others (book value)	877		(595)
Ending balance	0		0
PT Wampu Electric Power
Book value
Beginning balance	27,865		29,355
Acquisition	0		0
Disposal	0		0
Dividends received	0		(1,303)
Share of profit (loss)	3,196		3,245
Other comprehensive income (loss)	1,355		(1,639)
Others (book value)	2,661		(1,793)
Ending balance	35,077		27,865
PT. Bayan Resources TBK
Book value
Beginning balance	425,234		445,141
Acquisition	0		0
Disposal	0		0
Dividends received	(68,666)		(15,720)
Share of profit (loss)	267,874		17,139
Other comprehensive income (loss)	36,885		(21,256)
Others (book value)	(38)		(70)
Ending balance	661,289		425,234
S-Power Co., Ltd.
Book value
Beginning balance	110,292		115,784
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	12,437		(5,429)
Other comprehensive income (loss)	57		0
Others (book value)	0		(63)
Ending balance	122,786		110,292
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 (book value)	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 (book value)	0		0
Ending balance	0		0
Xe-Pian Xe-Namnoy Power Co., Ltd.
Book value
Beginning balance	64,570		72,935
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	19,306		(2,896)
Other comprehensive income (loss)	8,565		(5,469)
Others (book value)	0		0
Ending balance	92,441		64,570
Hadong Mineral Fiber 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 (book value)	0		0
Ending balance	0		0
Green Biomass Co., Ltd.
Book value
Beginning balance	0		108
Acquisition			0
Disposal			(108)
Dividends received			0
Share of profit (loss)			0
Other comprehensive income (loss)			0
Others (book value)			0
Ending balance			0
PT. Mutiara Jawa
Book value
Beginning balance	1,780		1,438
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	630		459
Other comprehensive income (loss)	159		(117)
Others (book value)	0		0
Ending balance	2,569		1,780
Samcheok Eco Materials 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 (book value)	0		0
Ending balance	0		0
Noeul Green Energy Co., Ltd.
Book value
Beginning balance	4,197		6,610
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	(389)		(2,413)
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	3,808		4,197
Naepo Green Energy Co., Ltd.
Book value
Beginning balance	0		0
Acquisition			0
Disposal			0
Dividends received			0
Share of profit (loss)			(9,789)
Other comprehensive income (loss)			0
Others (book value)			9,789
Ending balance			0
Goseong Green Power Co., Ltd.
Book value
Beginning balance	2,186		2,340
Acquisition	259,840		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	(1,168)		(154)
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	260,858		2,186
Gangneung Eco Power Co., Ltd.
Book value
Beginning balance	2,368		2,430
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	(80)		(62)
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	2,288		2,368
Shin Pyeongtaek Power Co., Ltd.
Book value
Beginning balance	69,591		66,956
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	23,476		11,877
Other comprehensive income (loss)	0		(3,604)
Others (book value)	7		(5,638)
Ending balance	93,074		69,591
Haeng Bok Do Si Photovoltaic Power Co Ltd
Book value
Beginning balance	210		215
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	13		(5)
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	223		210
Dongducheon Dream Power Co., Ltd.
Book value
Beginning balance	80,637		76,547
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	(6,439)		4,095
Other comprehensive income (loss)	0		0
Others (book value)	0		(5)
Ending balance	74,198		80,637
Jinbhuvish Power Generation Pvt. 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 (book value)	0		0
Ending balance	0		0
Daejung Offshore Wind Power Co., Ltd.
Book value
Beginning balance	2,165		2,361
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	(461)		(411)
Other comprehensive income (loss)	0		0
Others (book value)	0		215
Ending balance	1,704		2,165
GS Donghae Electric Power Co., Ltd.
Book value
Beginning balance	244,426		255,983
Acquisition	0		0
Disposal	0		0
Dividends received	(15,640)		(25,796)
Share of profit (loss)	14,972		14,265
Other comprehensive income (loss)	0		0
Others (book value)	14		(26)
Ending balance	243,772		244,426
Daegu Photovoltaic Co., Ltd.
Book value
Beginning balance	2,066		2,060
Acquisition	0		0
Disposal	0		0
Dividends received	(206)		(325)
Share of profit (loss)	482		331
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	2,342		2,066
Busan Green Energy Co., Ltd.
Book value
Beginning balance	8,778		10,637
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	(3,750)		(1,862)
Other comprehensive income (loss)	0		0
Others (book value)	4		3
Ending balance	5,032		8,778
Gunsan Bio Energy 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 (book value)	0		0
Ending balance	0		0
Korea Electric Vehicle Charging Service
Book value
Beginning balance	576		1,063
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	(283)		(491)
Other comprehensive income (loss)	0		0
Others (book value)	957		4
Ending balance	1,250		576
Korea Nuclear Partners Co., Ltd.
Book value
Beginning balance	200		0
Acquisition			247
Disposal			0
Dividends received			0
Share of profit (loss)			(43)
Other comprehensive income (loss)			(4)
Others (book value)			0
Ending balance			200
Korea Electric Power Corporation Fund
Book value
Beginning balance	41,926		41,126
Acquisition	0		0
Disposal	(3,090)		0
Dividends received	0		0
Share of profit (loss)	9,065		(908)
Other comprehensive income (loss)	82		1,708
Others (book value)	0		0
Ending balance	47,983		41,926
Energy Infra Asset Management Co., Ltd.
Book value
Beginning balance	938		791
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	128		147
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	1,066		938
Daegu clean Energy Co., Ltd.
Book value
Beginning balance	12		13
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	0		(1)
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	12		12
Yaksu ESS Co., Ltd.
Book value
Beginning balance	454		516
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	262		(62)
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	716		454
Nepal Water & Energy Development Company Private Ltd
Book value
Beginning balance	42,677		31,145
Acquisition	19,960		14,697
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	(616)		(1,699)
Other comprehensive income (loss)	4,312		(1,466)
Others (book value)	0		0
Ending balance	66,333		42,677
Gwangyang Green Energy Co., Ltd.
Book value
Beginning balance	926		948
Acquisition	24,800		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	(138)		(22)
Other comprehensive income (loss)	(122)		0
Others (book value)	0		0
Ending balance	25,466		926
PND Solar Co., Ltd.
Book value
Beginning balance	1,149		1,144
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	80		5
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	1,229		1,149
Hyundai Ecoenergy Co., Ltd.
Book value
Beginning balance	4,250		3,781
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	1,322		469
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	5,572		4,250
YeongGwang Yaksu Wind Electric Co., Ltd.
Book value
Beginning balance	312		386
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	(79)		(74)
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	233		312
Green Energy Electricity Generation Co., Ltd.
Book value
Beginning balance	25		163
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	1,688		(138)
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	1,713		25
Korea Energy Solution Co., Ltd.
Book value
Beginning balance	197		259
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	(74)		(62)
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	123		197
ITR Co., Ltd.
Book value
Beginning balance	40		33
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	(8)		7
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	32		40
Structure test network Co., Ltd.
Book value
Beginning balance	27		21
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	279		6
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	306		27
Namjeongsusang Solar Power Operation Co., Ltd.
Book value
Beginning balance	103		812
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	258		(709)
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	361		103
Indeck Niles Development, LLC
Book value
Beginning balance	20,627		0
Acquisition	222,551		45,562
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	(13,160)		(13,344)
Other comprehensive income (loss)	6,652		(9,846)
Others (book value)	9,603		(1,745)
Ending balance	246,273	[2]	20,627
Indeck Niles Asset Management, LLC
Book value
Beginning balance	101		87
Acquisition	0		0
Disposal	0		0
Dividends received	0		(539)
Share of profit (loss)	567		559
Other comprehensive income (loss)	0		0
Others (book value)	(557)		(6)
Ending balance	111		101
Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1
Book value
Beginning balance	7,326		7,126
Acquisition	0		294
Disposal	(188)		(99)
Dividends received	0		(291)
Share of profit (loss)	399		296
Other comprehensive income (loss)	0		0
Others (book value)	(399)		0
Ending balance	7,138		7,326
Suwon New Power Co., Ltd.
Book value
Beginning balance	1,054		798
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	(5)		256
Other comprehensive income (loss)	(14)		0
Others (book value)	0		0
Ending balance	1,035		1,054
KPGE Inc.
Book value
Beginning balance	287		287
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	22		0
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	309		287
Gwangbaek Solar Power Investment Co., Ltd.
Book value
Beginning balance	4,682		2,054
Acquisition	0		2,703
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	124		(75)
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	4,806		4,682
Go deok Clean Energy Co., Ltd
Book value
Beginning balance	960		1,830
Acquisition	3,730		0
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	(333)		(843)
Other comprehensive income (loss)	(55)		(27)
Others (book value)	0		0
Ending balance	4,302		960
SureDataLab Co., Ltd.
Book value
Beginning balance	85		0
Acquisition	0		126
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	43		(41)
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	128		85
SEP Co., Ltd.
Book value
Beginning balance	14		0
Acquisition	0		27
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	(7)		(13)
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	7		14
Hankook Electric Power Information Co., Ltd.
Book value
Beginning balance	139		0
Acquisition	0		38
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	22		101
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	161		139
Tronix Co., Ltd.
Book value
Beginning balance	119		0
Acquisition	0		75
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	(10)		44
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	109		119
O2&B Global Co., Ltd.
Book value
Beginning balance	22		0
Acquisition	0		25
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	13		(3)
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	35		22
Muan Sunshine Solar Power Plant Co., Ltd.
Book value
Beginning balance	1,096		0
Acquisition	0		79
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	172		(475)
Other comprehensive income (loss)	0		0
Others (book value)	0		1,492
Ending balance	1,268		1,096
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 (book value)	0		0
Ending balance	0		0
Jeju SolarOne Co., Ltd.
Book value
Beginning balance	159		0
Acquisition	45		161
Disposal	(206)		0
Dividends received	0		0
Share of profit (loss)	(1)		0
Other comprehensive income (loss)	0		(2)
Others (book value)	3		0
Ending balance	0		159
Energy Innovation Fund I
Book value
Beginning balance	0		0
Acquisition			4,000
Disposal			0
Dividends received			(2)
Share of profit (loss)			(159)
Other comprehensive income (loss)			0
Others (book value)			(3,839)
Ending balance			0
Goesan Solar Park Co., Ltd.
Book value
Beginning balance	1,684		0
Acquisition	0		1,276
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	249		408
Other comprehensive income (loss)	(6)		0
Others (book value)	0		0
Ending balance	1,927		1,684
Saemangeum Heemang Photovoltaic Co.,Ltd.
Book value
Beginning balance	11,022		0
Acquisition	0		11,022
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	(784)		0
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	10,238		11,022
Bitgoel Eco Energy Co., Ltd.
Book value
Beginning balance	29		0
Acquisition	4,611		29
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	(261)		0
Other comprehensive income (loss)	(23)		0
Others (book value)	0		0
Ending balance	4,356		29
Jeju Gimnyeong Wind Power Co., Ltd.
Book value
Beginning balance	1,578		0
Acquisition	0		714
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	(665)		864
Other comprehensive income (loss)	(2)		0
Others (book value)	0		0
Ending balance	911		1,578
Seoroseoro Sunny Power Plant Co., Ltd.
Book value
Beginning balance	230		0
Acquisition	476		230
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	15		0
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	721		230
Muan Solar Park Co., Ltd.
Book value
Beginning balance	4,180		0
Acquisition	220		4,180
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	1,683		0
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	6,083		4,180
YuDang Solar Co., Ltd.
Book value
Beginning balance	360		0
Acquisition	0		360
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	205		0
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	565		360
Anjwa Smart Farm & Solar City Co., Ltd.
Book value
Beginning balance	5,510		0
Acquisition	141		5,510
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	1,133		0
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	6,784		5,510
Daewon Green Energy Co., Ltd.
Book value
Beginning balance	3,910		0
Acquisition	0		3,910
Disposal	0		0
Dividends received	0		0
Share of profit (loss)	(33)		0
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	3,877		3,910
Hansuwon KNP Co., Ltd. (formerly, Korea Nuclear Partners Co., Ltd.)
Book value
Beginning balance	200
Acquisition	0
Disposal	0
Dividends received	0
Share of profit (loss)	19
Other comprehensive income (loss)	0
Others (book value)	0
Ending balance	219		200
G.GURU Co., Ltd.
Book value
Beginning balance	0
Acquisition	493
Disposal	0
Dividends received	0
Share of profit (loss)	(90)
Other comprehensive income (loss)	0
Others (book value)	0
Ending balance	403		0
UD4M Co., Ltd.
Book value
Beginning balance	0
Acquisition	75
Disposal	0
Dividends received	0
Share of profit (loss)	217
Other comprehensive income (loss)	0
Others (book value)	(148)
Ending balance	144		0
Dongbu Highway Solar Co.,Ltd.
Book value
Beginning balance	0
Acquisition	0
Disposal	0
Dividends received	0
Share of profit (loss)	74
Other comprehensive income (loss)	0
Others (book value)	191
Ending balance	265		0
Seobu Highway Solar Co.,Ltd.
Book value
Beginning balance	0
Acquisition	0
Disposal	0
Dividends received	0
Share of profit (loss)	94
Other comprehensive income (loss)	0
Others (book value)	195
Ending balance	289		0
Korea Energy Data Co., Ltd.
Book value
Beginning balance	0
Acquisition	60
Disposal	0
Dividends received	0
Share of profit (loss)	2
Other comprehensive income (loss)	0
Others (book value)	0
Ending balance	62		0
Gangneung Sacheon Fuel Cell Co., Ltd.
Book value
Beginning balance	0
Acquisition	1,950
Disposal	0
Dividends received	0
Share of profit (loss)	(72)
Other comprehensive income (loss)	0
Others (book value)	0
Ending balance	1,878		0
Kosture Co., Ltd.
Book value
Beginning balance	0
Acquisition	0
Disposal	0
Dividends received	0
Share of profit (loss)	0
Other comprehensive income (loss)	0
Others (book value)	0
Ending balance	0		0
Digital Innovation Growth Fund
Book value
Beginning balance	0
Acquisition	10,000
Disposal	0
Dividends received	0
Share of profit (loss)	(110)
Other comprehensive income (loss)	0
Others (book value)	0
Ending balance	9,890	[3]	0
Taebaek Gadeoksan Wind Power Co., Ltd.
Book value
Beginning balance	0
Acquisition	0
Disposal	0
Dividends received	0
Share of profit (loss)	2,532
Other comprehensive income (loss)	0
Others (book value)	13,963
Ending balance	16,495		0
Chuncheon Green Energy Co., Ltd.
Book value
Beginning balance	0
Acquisition	3,400
Disposal	0
Dividends received	0
Share of profit (loss)	(28)
Other comprehensive income (loss)	0
Others (book value)	0
Ending balance	3,372	[4]	0
Yeomsubong Wind Power Co., Ltd.
Book value
Beginning balance	0
Acquisition	95
Disposal	0
Dividends received	0
Share of profit (loss)	0
Other comprehensive income (loss)	0
Others (book value)	0
Ending balance	95		0
Yeongyang Wind Power Corporation II
Book value
Beginning balance	0
Acquisition	7,965
Disposal	0
Dividends received	0
Share of profit (loss)	0
Other comprehensive income (loss)	0
Others (book value)	0
Ending balance	7,965		0
Haeparang Energy Co., Ltd.
Book value
Beginning balance	0
Acquisition	2,241
Disposal	0
Dividends received	0
Share of profit (loss)	0
Other comprehensive income (loss)	0
Others (book value)	0
Ending balance	2,241		0
Saemangeum Sebit Power Plant Co., Ltd.
Book value
Beginning balance	0
Acquisition	6,000
Disposal	0
Dividends received	0
Share of profit (loss)	0
Other comprehensive income (loss)	0
Others (book value)	0
Ending balance	₩ 6,000	[4]	₩ 0
[1]	The effective percentage of ownership is 22.02% considering treasury stocks.
[2]	According to the shareholders’ agreement, additional investment of 50% of total stake is agreed by March 2022.
[3]	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.
[4]	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.

Investments in Associates 3 (De

Investments in Associates 3 (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Korea Gas Corporation
Disclosure of associates [line items]
Total assets	₩ 43,669,902	₩ 35,909,775
Total liabilities	34,550,567	28,174,619
Sales of Associates	27,520,756	20,833,722
Profit (loss) for the period of Associates	950,757	(172,060)
Korea Electric Power Industrial Development Co., Ltd.
Disclosure of associates [line items]
Total assets	158,163	164,015
Total liabilities	73,278	75,636
Sales of Associates	312,705	297,962
Profit (loss) for the period of Associates	7,233	16,284
YTN Co., Ltd.
Disclosure of associates [line items]
Total assets	367,950	295,151
Total liabilities	126,062	105,923
Sales of Associates	137,439	126,730
Profit (loss) for the period of Associates	51,044	7,095
Gangwon Wind Power Co., Ltd.
Disclosure of associates [line items]
Total assets	71,153	77,297
Total liabilities	1,121	1,336
Sales of Associates	19,623	23,350
Profit (loss) for the period of Associates	5,433	7,472
Hyundai Green Power Co., Ltd.
Disclosure of associates [line items]
Total assets	812,287	874,574
Total liabilities	391,754	416,732
Sales of Associates	101,818	390,442
Profit (loss) for the period of Associates	(280)	55,591
Korea Power Exchange
Disclosure of associates [line items]
Total assets	331,640	337,577
Total liabilities	61,912	68,455
Sales of Associates	110,075	104,698
Profit (loss) for the period of Associates	492	979
Taebaek Wind Power Co., Ltd.
Disclosure of associates [line items]
Total assets	30,375	28,048
Total liabilities	3,176	2,480
Sales of Associates	5,744	4,364
Profit (loss) for the period of Associates	1,588	(561)
Taeback Guinemi Wind Power Co., Ltd.
Disclosure of associates [line items]
Total assets	43,411	44,434
Total liabilities	29,985	32,085
Sales of Associates	5,910	5,023
Profit (loss) for the period of Associates	1,371	1,368
Pyeongchang Wind Power Co., Ltd.
Disclosure of associates [line items]
Total assets	69,939	72,713
Total liabilities	48,295	52,606
Sales of Associates	10,087	8,387
Profit (loss) for the period of Associates	1,537	(154)
Daeryun Power Co., Ltd.
Disclosure of associates [line items]
Total assets	757,157	789,277
Total liabilities	476,152	498,346
Sales of Associates	188,193	126,343
Profit (loss) for the period of Associates	(10,232)	1,941
Changjuk Wind Power Co., Ltd.
Disclosure of associates [line items]
Total assets	29,539	27,515
Total liabilities	1,690	1,292
Sales of Associates	6,213	4,777
Profit (loss) for the period of Associates	3,265	656
KNH Solar Co., Ltd.
Disclosure of associates [line items]
Total assets	13,859	18,240
Total liabilities	5,423	9,219
Sales of Associates	3,222	3,564
Profit (loss) for the period of Associates	805	728
SPC Power Corporation
Disclosure of associates [line items]
Total assets	242,058	255,462
Total liabilities	18,535	17,705
Sales of Associates	54,042	47,091
Profit (loss) for the period of Associates	35,441	39,677
Gemeng International Energy Co., Ltd.
Disclosure of associates [line items]
Total assets	8,151,333	7,427,157
Total liabilities	5,976,164	5,428,013
Sales of Associates	2,511,377	1,955,707
Profit (loss) for the period of Associates	(404,570)	64,077
PT. Cirebon Electric Power
Disclosure of associates [line items]
Total assets	697,614	730,020
Total liabilities	254,089	301,615
Sales of Associates	273,650	246,014
Profit (loss) for the period of Associates	39,965	40,676
KNOC Nigerian East Oil Co., Ltd.
Disclosure of associates [line items]
Total assets	24,693	22,215
Total liabilities	102,722	93,736
Sales of Associates	0	0
Profit (loss) for the period of Associates	(99)	(142)
KNOC Nigerian West Oil Co., Ltd.
Disclosure of associates [line items]
Total assets	26,625	23,999
Total liabilities	98,360	89,739
Sales of Associates	0	0
Profit (loss) for the period of Associates	(99)	(142)
PT Wampu Electric Power
Disclosure of associates [line items]
Total assets	209,172	199,841
Total liabilities	132,917	139,264
Sales of Associates	20,294	20,265
Profit (loss) for the period of Associates	7,102	7,372
PT. Bayan Resources TBK
Disclosure of associates [line items]
Total assets	2,884,474	1,544,875
Total liabilities	743,452	795,131
Sales of Associates	3,264,057	1,646,390
Profit (loss) for the period of Associates	1,456,893	219,406
S-Power Co., Ltd.
Disclosure of associates [line items]
Total assets	856,963	782,561
Total liabilities	603,519	554,393
Sales of Associates	608,259	421,519
Profit (loss) for the period of Associates	24,998	(10,805)
Pioneer Gas Power Limited
Disclosure of associates [line items]
Total assets	282,577	260,344
Total liabilities	438,366	359,790
Sales of Associates	0	0
Profit (loss) for the period of Associates	(36,864)	(44,568)
Eurasia Energy Holdings
Disclosure of associates [line items]
Total assets	606	556
Total liabilities	1,082	993
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	1,321,406	1,138,994
Total liabilities	947,430	876,336
Sales of Associates	161,686	140,069
Profit (loss) for the period of Associates	76,996	(11,318)
Hadong Mineral Fiber Co., Ltd.
Disclosure of associates [line items]
Total assets		203
Total liabilities		231
Sales of Associates		0
Profit (loss) for the period of Associates		0
PT. Mutiara Jawa
Disclosure of associates [line items]
Total assets	24,355	23,061
Total liabilities	15,498	16,923
Sales of Associates	10,958	7,946
Profit (loss) for the period of Associates	2,835	2,523
Samcheok Eco Materials Co., Ltd.
Disclosure of associates [line items]
Total assets	26,545	24,024
Total liabilities	1,854	598
Sales of Associates	14,281	10,483
Profit (loss) for the period of Associates	1,237	23
Noeul Green Energy Co., Ltd.
Disclosure of associates [line items]
Total assets	109,354	116,929
Total liabilities	96,222	102,457
Sales of Associates	36,029	27,486
Profit (loss) for the period of Associates	(1,269)	(8,303)
Goseong Green Power Co., Ltd.
Disclosure of associates [line items]
Total assets	5,412,537	4,559,480
Total liabilities	4,509,791	4,351,119
Sales of Associates	740,028	0
Profit (loss) for the period of Associates	51,450	(12,280)
Gangneung Eco Power Co., Ltd.
Disclosure of associates [line items]
Total assets	4,001,681	2,630,752
Total liabilities	3,851,537	2,475,848
Sales of Associates	0	0
Profit (loss) for the period of Associates	(4,188)	(3,623)
Shin Pyeongtaek Power Co., Ltd.
Disclosure of associates [line items]
Total assets	1,028,028	1,020,650
Total liabilities	764,551	814,369
Sales of Associates	653,117	520,468
Profit (loss) for the period of Associates	57,202	32,002
Haeng Bok Do Si Photovoltaic Power Co Ltd
Disclosure of associates [line items]
Total assets	1,823	2,001
Total liabilities	1,033	1,258
Sales of Associates	426	387
Profit (loss) for the period of Associates	46	(11)
Dongducheon Dream Power Co., Ltd.
Disclosure of associates [line items]
Total assets	1,398,244	1,374,640
Total liabilities	1,139,521	1,095,926
Sales of Associates	750,127	524,890
Profit (loss) for the period of Associates	(16,685)	10,982
Jinbhuvish Power Generation Pvt. Ltd.
Disclosure of associates [line items]
Total assets	62,926	58,699
Total liabilities	12,995	12,122
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	5,321	6,281
Total liabilities	1,664	1,634
Sales of Associates	0	0
Profit (loss) for the period of Associates	(149)	(810)
GS Donghae Electric Power Co., Ltd.
Disclosure of associates [line items]
Total assets	2,149,060	2,174,835
Total liabilities	1,432,083	1,455,935
Sales of Associates	760,323	685,579
Profit (loss) for the period of Associates	44,035	41,955
Daegu Photovoltaic Co., Ltd.
Disclosure of associates [line items]
Total assets	13,046	13,843
Total liabilities	4,970	6,718
Sales of Associates	3,519	3,343
Profit (loss) for the period of Associates	1,621	1,149
Busan Green Energy Co., Ltd.
Disclosure of associates [line items]
Total assets	163,016	170,261
Total liabilities	145,664	139,995
Sales of Associates	45,088	40,241
Profit (loss) for the period of Associates	(10,843)	(6,422)
Gunsan Bio Energy Co., Ltd.
Disclosure of associates [line items]
Total assets	8,503	9,340
Total liabilities	28,981	28,322
Sales of Associates	0	0
Profit (loss) for the period of Associates	(1,496)	(1,501)
Korea Electric Vehicle Charging Service
Disclosure of associates [line items]
Total assets	13,351	8,173
Total liabilities	6,207	6,116
Sales of Associates	13,808	10,807
Profit (loss) for the period of Associates	(1,022)	(1,756)
Korea Nuclear Partners Co., Ltd.
Disclosure of associates [line items]
Total assets		1,350
Total liabilities		105
Sales of Associates		1,062
Profit (loss) for the period of Associates		(150)
Korea Electric Power Corporation Fund
Disclosure of associates [line items]
Total assets	49,150	42,988
Total liabilities	237	249
Sales of Associates	9,773	82
Profit (loss) for the period of Associates	9,534	(730)
Energy Infra Asset Management Co., Ltd.
Disclosure of associates [line items]
Total assets	11,196	10,424
Total liabilities	426	946
Sales of Associates	4,703	5,130
Profit (loss) for the period of Associates	1,306	1,488
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)
Yaksu ESS Co., Ltd.
Disclosure of associates [line items]
Total assets	6,999	6,584
Total liabilities	4,535	5,022
Sales of Associates	1,715	217
Profit (loss) for the period of Associates	903	(212)
Nepal Water & Energy Development Company Private Ltd
Disclosure of associates [line items]
Total assets	153,184	109,321
Total liabilities	58,545	41,093
Sales of Associates	0	0
Profit (loss) for the period of Associates	(642)	(444)
Gwangyang Green Energy Co., Ltd.
Disclosure of associates [line items]
Total assets	128,375	28,634
Total liabilities	1,136	24,095
Sales of Associates	0	0
Profit (loss) for the period of Associates	(688)	(113)
PND Solar Co., Ltd.
Disclosure of associates [line items]
Total assets	37,152	38,997
Total liabilities	33,444	35,566
Sales of Associates	5,078	5,129
Profit (loss) for the period of Associates	(128)	(121)
Hyundai Ecoenergy Co., Ltd.
Disclosure of associates [line items]
Total assets	186,309	195,040
Total liabilities	158,111	173,800
Sales of Associates	25,762	24,166
Profit (loss) for the period of Associates	6,921	4,280
YeongGwang Yaksu Wind Electric Co., Ltd.
Disclosure of associates [line items]
Total assets	40,484	43,039
Total liabilities	41,176	42,915
Sales of Associates	7,066	5,802
Profit (loss) for the period of Associates	(914)	(637)
Green Energy Electricity Generation Co., Ltd.
Disclosure of associates [line items]
Total assets	75,664	53,934
Total liabilities	72,442	56,533
Sales of Associates	2,796	0
Profit (loss) for the period of Associates	(58)	(920)
Korea Energy Solution Co., Ltd.
Disclosure of associates [line items]
Total assets	654	1,009
Total liabilities	40	25
Sales of Associates	228	78
Profit (loss) for the period of Associates	(347)	(280)
ITR Co., Ltd.
Disclosure of associates [line items]
Total assets	529	418
Total liabilities	372	220
Sales of Associates	135	153
Profit (loss) for the period of Associates	(29)	(66)
Structure test network Co., Ltd.
Disclosure of associates [line items]
Total assets	1,665	101
Total liabilities	400	234
Sales of Associates	1,451	99
Profit (loss) for the period of Associates	1,134	27
Namjeongsusang Solar Power Operation Co., Ltd.
Disclosure of associates [line items]
Total assets	56,376	63,041
Total liabilities	54,104	62,488
Sales of Associates	7,095	1,128
Profit (loss) for the period of Associates	(1,280)	(4,655)
Indeck Niles Development, LLC
Disclosure of associates [line items]
Total assets	1,051,557	772,124
Total liabilities	729,078	738,826
Sales of Associates	0	0
Profit (loss) for the period of Associates	(25,184)	(29,392)
Indeck Niles Asset Management, LLC
Disclosure of associates [line items]
Total assets	347	314
Total liabilities	13	11
Sales of Associates	2,232	2,272
Profit (loss) for the period of Associates	1,135	1,139
Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1
Disclosure of associates [line items]
Total assets	14,778	15,157
Total liabilities	211	206
Sales of Associates	848	634
Profit (loss) for the period of Associates	815	603
Suwon New Power Co., Ltd.
Disclosure of associates [line items]
Total assets	1,997	1,974
Total liabilities	30	8
Sales of Associates	0	0
Profit (loss) for the period of Associates	2	0
KPGE Inc.
Disclosure of associates [line items]
Total assets	1,086	1,021
Total liabilities	20	32
Sales of Associates	709	354
Profit (loss) for the period of Associates	77	5
Gwangbaek Solar Power Investment Co., Ltd.
Disclosure of associates [line items]
Total assets	320,001	339,223
Total liabilities	309,796	329,298
Sales of Associates	14,615	13,192
Profit (loss) for the period of Associates	125	(329)
Go deok Clean Energy Co., Ltd
Disclosure of associates [line items]
Total assets	65,566	1,639
Total liabilities	54,811	65
Sales of Associates	0	0
Profit (loss) for the period of Associates	(2,482)	(1,382)
SureDataLab Co., Ltd.
Disclosure of associates [line items]
Total assets	612	400
Total liabilities	79	47
Sales of Associates	733	303
Profit (loss) for the period of Associates	205	(108)
SEP Co., Ltd.
Disclosure of associates [line items]
Total assets	132	164
Total liabilities	100	100
Sales of Associates	0	0
Profit (loss) for the period of Associates	(2)	(63)
Hankook Electric Power Information Co., Ltd.
Disclosure of associates [line items]
Total assets	1,512	1,163
Total liabilities	876	613
Sales of Associates	1,887	1,208
Profit (loss) for the period of Associates	229	390
Tronix Co., Ltd.
Disclosure of associates [line items]
Total assets	1,002	942
Total liabilities	455	349
Sales of Associates	2,228	2,030
Profit (loss) for the period of Associates	89	(6)
O2&B Global Co., Ltd.
Disclosure of associates [line items]
Total assets	231	233
Total liabilities	54	125
Sales of Associates	345	285
Profit (loss) for the period of Associates	3	(57)
Muan Sunshine Solar Power Plant Co., Ltd.
Disclosure of associates [line items]
Total assets	142,858	147,908
Total liabilities	138,987	144,898
Sales of Associates	15,582	6,017
Profit (loss) for the period of Associates	(156)	(2,365)
Bigeum Resident Photovoltaic Power Co., Ltd.
Disclosure of associates [line items]
Total assets	22,159	11,164
Total liabilities	23,158	11,551
Sales of Associates	0	0
Profit (loss) for the period of Associates	(608)	(309)
Jeju SolarOne Co., Ltd.
Disclosure of associates [line items]
Total assets		1,608
Total liabilities		14
Sales of Associates		0
Profit (loss) for the period of Associates		(4)
Goesan Solar Park Co., Ltd.
Disclosure of associates [line items]
Total assets	52,443	56,332
Total liabilities	45,799	50,524
Sales of Associates	6,388	2,809
Profit (loss) for the period of Associates	836	(262)
Saemangeum Heemang Photovoltaic Co.,Ltd.
Disclosure of associates [line items]
Total assets	157,298	35,447
Total liabilities	130,158	6,070
Sales of Associates	902	0
Profit (loss) for the period of Associates	(2,237)	(1,943)
Bitgoel Eco Energy Co., Ltd.
Disclosure of associates [line items]
Total assets	51,471	100
Total liabilities	36,450	0
Sales of Associates	0	0
Profit (loss) for the period of Associates	(900)	0
Jeju Gimnyeong Wind Power Co., Ltd.
Disclosure of associates [line items]
Total assets	65,754	72,557
Total liabilities	62,716	67,297
Sales of Associates	6,915	8,927
Profit (loss) for the period of Associates	(2,085)	(1,576)
Seoroseoro Sunny Power Plant Co., Ltd.
Disclosure of associates [line items]
Total assets	5,833	1,182
Total liabilities	4,186	0
Sales of Associates	469	0
Profit (loss) for the period of Associates	36	0
Muan Solar Park Co., Ltd.
Disclosure of associates [line items]
Total assets	226,920	245,431
Total liabilities	198,132	225,057
Sales of Associates	30,990	14,359
Profit (loss) for the period of Associates	8,639	(966)
YuDang Solar Co., Ltd.
Disclosure of associates [line items]
Total assets	22,430	23,360
Total liabilities	19,604	20,876
Sales of Associates	3,452	1,611
Profit (loss) for the period of Associates	626	686
Anjwa Smart Farm & Solar City Co., Ltd.
Disclosure of associates [line items]
Total assets	278,981	295,570
Total liabilities	249,143	271,396
Sales of Associates	37,691	1,900
Profit (loss) for the period of Associates	5,996	(1,684)
Daewon Green Energy Co., Ltd.
Disclosure of associates [line items]
Total assets	131,218	15,370
Total liabilities	116,100	122
Sales of Associates	18	0
Profit (loss) for the period of Associates	(130)	₩ (93)
Hansuwon KNP Co., Ltd. (formerly, Korea Nuclear Partners Co., Ltd.)
Disclosure of associates [line items]
Total assets	1,409
Total liabilities	100
Sales of Associates	836
Profit (loss) for the period of Associates	64
G.GURU Co., Ltd.
Disclosure of associates [line items]
Total assets	1,644
Total liabilities	8
Sales of Associates	58
Profit (loss) for the period of Associates	(346)
UD4M Co., Ltd.
Disclosure of associates [line items]
Total assets	1,359
Total liabilities	205
Sales of Associates	1,004
Profit (loss) for the period of Associates	196
Dongbu Highway Solar Co., Ltd.
Disclosure of associates [line items]
Total assets	18,794
Total liabilities	17,721
Sales of Associates	2,394
Profit (loss) for the period of Associates	163
Seobu Highway Solar Co., Ltd.
Disclosure of associates [line items]
Total assets	19,828
Total liabilities	18,384
Sales of Associates	2,647
Profit (loss) for the period of Associates	315
Korea Energy Data Co., Ltd.
Disclosure of associates [line items]
Total assets	238
Total liabilities	27
Sales of Associates	86
Profit (loss) for the period of Associates	6
Gangneung Sacheon Fuel Cell Co., Ltd.
Disclosure of associates [line items]
Total assets	2,758
Total liabilities	3
Sales of Associates	0
Profit (loss) for the period of Associates	(123)
Kosture Co., Ltd.
Disclosure of associates [line items]
Total assets	150
Total liabilities	26
Sales of Associates	166
Profit (loss) for the period of Associates	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	166,172
Total liabilities	124,570
Sales of Associates	22,773
Profit (loss) for the period of Associates	8,732
Chuncheon Green Energy Co., Ltd.
Disclosure of associates [line items]
Total assets	4,901
Total liabilities	20
Sales of Associates	0
Profit (loss) for the period of Associates	(101)
Yeomsubong Wind Power Co., Ltd.
Disclosure of associates [line items]
Total assets	400
Total liabilities	396
Sales of Associates	0
Profit (loss) for the period of Associates	(17)
Yeongyang Wind Power Corporation II
Disclosure of associates [line items]
Total assets	28,972
Total liabilities	9,456
Sales of Associates	0
Profit (loss) for the period of Associates	(1,233)
Haeparang Energy Co., Ltd.
Disclosure of associates [line items]
Total assets	9,566
Total liabilities	681
Sales of Associates	0
Profit (loss) for the period of Associates	(2)
Saemangeum Sebit Power Plant Co., Ltd.
Disclosure of associates [line items]
Total assets	105,259
Total liabilities	96,963
Sales of Associates	0
Profit (loss) for the period of Associates	₩ (190)

Investments in Associates 4 (De

Investments in Associates 4 (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Disclosure of associates [line items]
Book value	₩ 5,232,373		₩ 4,250,787		₩ 4,251,802
Korea Gas Corporation
Disclosure of associates [line items]
Net assets	₩ 9,119,335		₩ 7,735,156
Effective percentage of ownership	20.47%		22.02%
Share in net assets	₩ 1,866,728		₩ 1,703,281
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	(51,215)		(55,956)
Book value	1,815,513		1,647,325	[1]	1,693,967
Korea Electric Power Industrial Development Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 84,885		₩ 88,379
Effective percentage of ownership	29.00%		29.00%
Share in net assets	₩ 24,617		₩ 25,630
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	24,617		25,630		25,393
YTN Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 241,863		₩ 189,228
Effective percentage of ownership	21.43%		21.43%
Share in net assets	₩ 51,828		₩ 40,549
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	51,828		40,549		39,747
Gangwon Wind Power Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 70,032		₩ 75,961
Effective percentage of ownership	15.00%		15.00%
Share in net assets	₩ 10,505		₩ 11,394
Investment differential	49		49
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	10,554		11,443		12,327
Hyundai Green Power Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 420,533		₩ 457,842
Effective percentage of ownership	29.00%		29.00%
Share in net assets	₩ 121,955		₩ 132,774
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	121,955		132,774		124,253
Korea Power Exchange
Disclosure of associates [line items]
Net assets	₩ 269,728		₩ 269,122
Effective percentage of ownership	100.00%		100.00%
Share in net assets	₩ 269,728		₩ 269,122
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	269,728		269,122		258,899
Taebaek Wind Power Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 27,199		₩ 25,568
Effective percentage of ownership	25.00%		25.00%
Share in net assets	₩ 6,800		₩ 6,392
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	6,800		6,392		7,039
Taeback Guinemi Wind Power Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 13,426		₩ 12,349
Effective percentage of ownership	25.00%		25.00%
Share in net assets	₩ 3,357		₩ 3,087
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	3,357		3,087		2,553
Pyeongchang Wind Power Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 21,644		₩ 20,107
Effective percentage of ownership	25.00%		25.00%
Share in net assets	₩ 5,411		₩ 5,027
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	5,411		5,027		5,877
Daeryun Power Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 281,005		₩ 290,931
Effective percentage of ownership	9.34%		9.34%
Share in net assets	₩ 26,246		₩ 27,173
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	(820)		(820)
Book value	25,426		26,353		26,247
Changjuk Wind Power Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 27,849		₩ 26,223
Effective percentage of ownership	30.00%		30.00%
Share in net assets	₩ 8,355		₩ 7,867
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	8,355		7,867		8,520
KNH Solar Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 8,436		₩ 9,021
Effective percentage of ownership	27.00%		27.00%
Share in net assets	₩ 2,278		₩ 2,436
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	2,278		2,436		2,382
SPC Power Corporation
Disclosure of associates [line items]
Net assets	₩ 223,523		₩ 237,757
Effective percentage of ownership	38.00%		38.00%
Share in net assets	₩ 84,939		₩ 90,348
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	(19,893)		(20,436)
Book value	65,046		69,912		63,583
Gemeng International Energy Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 2,175,169		₩ 1,999,144
Effective percentage of ownership	34.00%		34.00%
Share in net assets	₩ 739,557		₩ 679,709
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	(144,339)		(1)
Book value	595,218		679,708		670,896
PT. Cirebon Electric Power
Disclosure of associates [line items]
Net assets	₩ 443,525		₩ 428,405
Effective percentage of ownership	27.50%		27.50%
Share in net assets	₩ 121,969		₩ 117,811
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	121,969		117,811		123,425
KNOC Nigerian East Oil Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ (78,029)		₩ (71,521)
Effective percentage of ownership	14.63%		14.63%
Share in net assets	₩ (11,416)		₩ (10,464)
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	11,416		10,464
Book value	0		0		0
KNOC Nigerian West Oil Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ (71,735)		₩ (65,740)
Effective percentage of ownership	14.63%		14.63%
Share in net assets	₩ (10,495)		₩ (9,618)
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	10,495		9,618
Book value	0		0		0
PT Wampu Electric Power
Disclosure of associates [line items]
Net assets	₩ 76,255		₩ 60,577
Effective percentage of ownership	46.00%		46.00%
Share in net assets	₩ 35,077		₩ 27,865
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	35,077		27,865		29,355
PT. Bayan Resources TBK
Disclosure of associates [line items]
Net assets	₩ 2,141,022		₩ 749,744
Effective percentage of ownership	20.00%		20.00%
Share in net assets	₩ 428,204		₩ 149,949
Investment differential	309,464		351,662
Intercompany transaction	0		0
Others (consolidated FS)	(76,379)		(76,377)
Book value	661,289		425,234		445,141
S-Power Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 253,444		₩ 228,168
Effective percentage of ownership	49.00%		49.00%
Share in net assets	₩ 124,188		₩ 111,802
Investment differential	0		0
Intercompany transaction	(1,402)		(1,510)
Others (consolidated FS)	0		0
Book value	122,786		110,292		115,784
Pioneer Gas Power Limited
Disclosure of associates [line items]
Net assets	₩ (155,789)		₩ (99,446)
Effective percentage of ownership	38.50%		38.50%
Share in net assets	₩ (59,975)		₩ (38,284)
Investment differential	22,278		22,278
Intercompany transaction	0		0
Others (consolidated FS)	37,697		16,006
Book value	0		0		0
Eurasia Energy Holdings
Disclosure of associates [line items]
Net assets	₩ (476)		₩ (437)
Effective percentage of ownership	40.00%		40.00%
Share in net assets	₩ (190)		₩ (175)
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	190		175
Book value	0		0		0
Xe-Pian Xe-Namnoy Power Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 373,976		₩ 262,658
Effective percentage of ownership	25.00%		25.00%
Share in net assets	₩ 93,494		₩ 65,665
Investment differential	305		305
Intercompany transaction	(1,069)		(1,110)
Others (consolidated FS)	(289)		(290)
Book value	92,441		64,570		72,935
Hadong Mineral Fiber Co., Ltd.
Disclosure of associates [line items]
Net assets			₩ (28)
Effective percentage of ownership			8.33%
Share in net assets			₩ (2)
Investment differential			0
Intercompany transaction			0
Others (consolidated FS)			2
Book value	0		0		0
PT. Mutiara Jawa
Disclosure of associates [line items]
Net assets	₩ 8,857		₩ 6,138
Effective percentage of ownership	29.00%		29.00%
Share in net assets	₩ 2,569		₩ 1,780
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	2,569		1,780		1,438
Samcheok Eco Materials Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 24,691		₩ 23,426
Effective percentage of ownership	25.54%		25.54%
Share in net assets	₩ 6,306		₩ 5,983
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	(6,306)		(5,983)
Book value	0		0		0
Noeul Green Energy Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 13,132		₩ 14,472
Effective percentage of ownership	29.00%		29.00%
Share in net assets	₩ 3,808		₩ 4,197
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	3,808		4,197		6,610
Goseong Green Power Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 902,746		₩ 208,361
Effective percentage of ownership	29.00%		1.12%
Share in net assets	₩ 261,796		₩ 2,324
Investment differential	0		0
Intercompany transaction	(938)		(138)
Others (consolidated FS)	0		0
Book value	260,858		2,186		2,340
Gangneung Eco Power Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 150,144		₩ 154,904
Effective percentage of ownership	1.61%		1.61%
Share in net assets	₩ 2,419		₩ 2,496
Investment differential	0		0
Intercompany transaction	(131)		(128)
Others (consolidated FS)	0		0
Book value	2,288		2,368		2,430
Shin Pyeongtaek Power Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 263,477		₩ 206,281
Effective percentage of ownership	40.00%		40.00%
Share in net assets	₩ 105,391		₩ 82,512
Investment differential	3,559		3,559
Intercompany transaction	(15,876)		(16,480)
Others (consolidated FS)	0		0
Book value	93,074		69,591		66,956
Haeng Bok Do Si Photovoltaic Power Co Ltd
Disclosure of associates [line items]
Net assets	₩ 790		₩ 743
Effective percentage of ownership	28.00%		28.00%
Share in net assets	₩ 221		₩ 208
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	2		2
Book value	223		210		215
Dongducheon Dream Power Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 258,723		₩ 278,714
Effective percentage of ownership	34.01%		34.01%
Share in net assets	₩ 87,992		₩ 94,791
Investment differential	1,757		1,757
Intercompany transaction	(2,969)		(3,329)
Others (consolidated FS)	(12,582)		(12,582)
Book value	74,198		80,637		76,547
Jinbhuvish Power Generation Pvt. Ltd.
Disclosure of associates [line items]
Net assets	₩ 49,931		₩ 46,577
Effective percentage of ownership	5.16%		5.16%
Share in net assets	₩ 2,576		₩ 2,403
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	(2,576)		(2,403)
Book value	0		0		0
Daejung Offshore Wind Power Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 3,657		₩ 4,647
Effective percentage of ownership	46.59%		46.59%
Share in net assets	₩ 1,704		₩ 2,165
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	1,704		2,165		2,361
GS Donghae Electric Power Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 716,977		₩ 718,900
Effective percentage of ownership	34.00%		34.00%
Share in net assets	₩ 243,772		₩ 244,426
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	243,772		244,426		255,983
Daegu Photovoltaic Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 8,076		₩ 7,125
Effective percentage of ownership	29.00%		29.00%
Share in net assets	₩ 2,342		₩ 2,066
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	2,342		2,066		2,060
Busan Green Energy Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 17,352		₩ 30,266
Effective percentage of ownership	29.00%		29.00%
Share in net assets	₩ 5,032		₩ 8,777
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		1
Book value	5,032		8,778		10,637
Gunsan Bio Energy Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ (20,478)		₩ (18,982)
Effective percentage of ownership	18.87%		18.87%
Share in net assets	₩ (3,864)		₩ (3,582)
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	3,864		3,582
Book value	0		0		0
Korea Electric Vehicle Charging Service
Disclosure of associates [line items]
Net assets	₩ 7,144		₩ 2,057
Effective percentage of ownership	17.50%		28.00%
Share in net assets	₩ 1,250		₩ 576
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	1,250		576		1,063
Korea Nuclear Partners Co., Ltd.
Disclosure of associates [line items]
Net assets			₩ 1,245
Effective percentage of ownership			28.98%
Share in net assets			₩ 361
Investment differential			0
Intercompany transaction			0
Others (consolidated FS)			(161)
Book value			200		0
Korea Electric Power Corporation Fund
Disclosure of associates [line items]
Net assets	₩ 48,913		₩ 42,739
Effective percentage of ownership	98.09%		98.09%
Share in net assets	₩ 47,979		₩ 41,923
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	4		3
Book value	47,983		41,926		41,126
Energy Infra Asset Management Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 10,770		₩ 9,478
Effective percentage of ownership	9.90%		9.90%
Share in net assets	₩ 1,066		₩ 938
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	1,066		938		791
Daegu clean Energy Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 44		₩ 44
Effective percentage of ownership	28.00%		28.00%
Share in net assets	₩ 12		₩ 12
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	12		12		13
Yaksu ESS Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 2,464		₩ 1,562
Effective percentage of ownership	29.00%		29.00%
Share in net assets	₩ 715		₩ 453
Investment differential	1		1
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	716		454		516
Nepal Water & Energy Development Company Private Ltd
Disclosure of associates [line items]
Net assets	₩ 94,639		₩ 68,228
Effective percentage of ownership	69.06%		58.59%
Share in net assets	₩ 65,361		₩ 39,975
Investment differential	972		971
Intercompany transaction	0		0
Others (consolidated FS)	0		1,731
Book value	66,333		42,677
Gwangyang Green Energy Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 127,239		₩ 4,539
Effective percentage of ownership	20.00%		20.00%
Share in net assets	₩ 25,448		₩ 908
Investment differential	18		18
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	25,466		926		948
PND Solar Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 3,708		₩ 3,431
Effective percentage of ownership	29.00%		29.00%
Share in net assets	₩ 1,075		₩ 995
Investment differential	154		154
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	1,229		1,149		1,144
Hyundai Ecoenergy Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 28,198		₩ 21,240
Effective percentage of ownership	19.00%		19.00%
Share in net assets	₩ 5,358		₩ 4,036
Investment differential	214		214
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	5,572		4,250		3,781
YeongGwang Yaksu Wind Electric Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ (692)		₩ 124
Effective percentage of ownership	9.63%		9.63%
Share in net assets	₩ (67)		₩ 12
Investment differential	300		300
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	233		312		386
Green Energy Electricity Generation Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 3,222		₩ (2,599)
Effective percentage of ownership	29.00%		29.00%
Share in net assets	₩ 934		₩ (754)
Investment differential	779		779
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	1,713		25		163
Korea Energy Solution Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 614		₩ 984
Effective percentage of ownership	20.00%		20.00%
Share in net assets	₩ 123		₩ 197
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	123		197		259
ITR Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 157		₩ 198
Effective percentage of ownership	20.00%		20.00%
Share in net assets	₩ 31		₩ 40
Investment differential	1		1
Intercompany transaction	0		0
Others (consolidated FS)	0		(1)
Book value	32		40		33
Structure Test Network Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 1,265		₩ (133)
Effective percentage of ownership	20.00%		20.00%
Share in net assets	₩ 253		₩ (27)
Investment differential	53		54
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	306		27		21
Namjeongsusang Solar Power Operation Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 2,272		₩ 553
Effective percentage of ownership	15.00%		15.00%
Share in net assets	₩ 341		₩ 83
Investment differential	20		20
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	361		103		812
Indeck Niles Development, LLC
Disclosure of associates [line items]
Net assets	₩ 322,479		₩ 33,298
Effective percentage of ownership	56.25%		24.08%
Share in net assets	₩ 181,395		₩ 8,017
Investment differential	64,878		12,610
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	246,273	[2]	20,627		0
Indeck Niles Asset Management, LLC
Disclosure of associates [line items]
Net assets	₩ 334		₩ 303
Effective percentage of ownership	33.33%		33.33%
Share in net assets	₩ 111		₩ 101
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	111		101		87
Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1
Disclosure of associates [line items]
Net assets	₩ 14,567		₩ 14,951
Effective percentage of ownership	49.00%		49.00%
Share in net assets	₩ 7,138		₩ 7,326
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	7,138		7,326		7,126
Suwon New Power Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 1,967		₩ 1,966
Effective percentage of ownership	39.90%		33.11%
Share in net assets	₩ 785		₩ 651
Investment differential	0		0
Intercompany transaction	250		267
Others (consolidated FS)	0		136
Book value	1,035		1,054		798
KPGE Inc.
Disclosure of associates [line items]
Net assets	₩ 1,066		₩ 989
Effective percentage of ownership	29.00%		29.00%
Share in net assets	₩ 309		₩ 287
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	309		287		287
Gwangbaek Solar Power Investment Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 10,205		₩ 9,925
Effective percentage of ownership	44.00%		44.00%
Share in net assets	₩ 4,490		₩ 4,367
Investment differential	316		315
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	4,806		4,682		2,054
Go deok Clean Energy Co., Ltd
Disclosure of associates [line items]
Net assets	₩ 10,755		₩ 1,574
Effective percentage of ownership	40.00%		61.00%
Share in net assets	₩ 4,302		₩ 960
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	4,302		960		1,830
SureDataLab Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 533		₩ 353
Effective percentage of ownership	23.95%		23.95%
Share in net assets	₩ 128		₩ 85
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	128		85		0
SEP Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 32		₩ 64
Effective percentage of ownership	21.26%		21.26%
Share in net assets	₩ 7		₩ 14
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	7		14		0
Hankook Electric Power Information Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 636		₩ 550
Effective percentage of ownership	25.25%		25.25%
Share in net assets	₩ 161		₩ 139
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	161		139		0
Tronix Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 547		₩ 593
Effective percentage of ownership	20.00%		20.00%
Share in net assets	₩ 109		₩ 119
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	109		119		0
O2&B Global Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 177		₩ 108
Effective percentage of ownership	20.00%		20.00%
Share in net assets	₩ 35		₩ 22
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	35		22		0
Muan Sunshine Solar Power Plant Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 3,871		₩ 3,010
Effective percentage of ownership	20.00%		20.00%
Share in net assets	₩ 774		₩ 602
Investment differential	494		494
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	1,268		1,096		0
Bigeum Resident Photovoltaic Power Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ (999)		₩ (387)
Effective percentage of ownership	29.90%		29.90%
Share in net assets	₩ (299)		₩ (116)
Investment differential	24		0
Intercompany transaction	0		0
Others (consolidated FS)	275		116
Book value	0		0		0
Jeju SolarOne Co., Ltd.
Disclosure of associates [line items]
Net assets			₩ 1,594
Effective percentage of ownership			10.00%
Share in net assets			₩ 159
Investment differential			0
Intercompany transaction			0
Others (consolidated FS)			0
Book value	0		159		0
Goesan Solar Park Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 6,644		₩ 5,808
Effective percentage of ownership	29.00%		29.00%
Share in net assets	₩ 1,927		₩ 1,684
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	1,927		1,684		0
Saemangeum Heemang Photovoltaic Co.,Ltd.
Disclosure of associates [line items]
Net assets	₩ 27,140		₩ 29,377
Effective percentage of ownership	35.00%		35.00%
Share in net assets	₩ 9,499		₩ 10,282
Investment differential	739		740
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	10,238		11,022		0
Bitgoel Eco Energy Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 15,021		₩ 100
Effective percentage of ownership	29.00%		29.00%
Share in net assets	₩ 4,356		₩ 29
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	4,356		29		0
Jeju Gimnyeong Wind Power Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 3,038		₩ 5,260
Effective percentage of ownership	30.00%		30.00%
Share in net assets	₩ 911		₩ 1,578
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	911		1,578		0
Seoroseoro Sunny Power Plant Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 1,647		₩ 1,182
Effective percentage of ownership	42.58%		19.46%
Share in net assets	₩ 701		₩ 230
Investment differential	20		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	721		230		0
Muan Solar Park Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 28,788		₩ 20,374
Effective percentage of ownership	20.00%		19.00%
Share in net assets	₩ 5,758		₩ 3,871
Investment differential	325		309
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	6,083		4,180		0
YuDang Solar Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 2,826		₩ 2,484
Effective percentage of ownership	20.00%		20.00%
Share in net assets	₩ 565		₩ 497
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		(137)
Book value	565		360		0
Anjwa Smart Farm & Solar City Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 29,838		₩ 24,174
Effective percentage of ownership	20.00%		19.50%
Share in net assets	₩ 5,968		₩ 4,714
Investment differential	816		796
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	6,784		5,510		0
Daewon Green Energy Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 15,118		₩ 15,248
Effective percentage of ownership	25.36%		25.36%
Share in net assets	₩ 3,833		₩ 3,866
Investment differential	44		44
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	3,877		3,910		₩ 0
Hansuwon KNP Co., Ltd. (formerly, Korea Nuclear Partners Co., Ltd.)
Disclosure of associates [line items]
Net assets	₩ 1,309
Effective percentage of ownership	28.98%
Share in net assets	₩ 379
Investment differential	0
Intercompany transaction	0
Others (consolidated FS)	(160)
Book value	219		200
G.GURU Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 1,636
Effective percentage of ownership	24.65%
Share in net assets	₩ 403
Investment differential	0
Intercompany transaction	0
Others (consolidated FS)	0
Book value	403		0
UD4M Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 1,154
Effective percentage of ownership	12.50%
Share in net assets	₩ 144
Investment differential	0
Intercompany transaction	0
Others (consolidated FS)	0
Book value	144		0
Dongbu Highway Solar Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 1,073
Effective percentage of ownership	20.00%
Share in net assets	₩ 215
Investment differential	50
Intercompany transaction	0
Others (consolidated FS)	0
Book value	265
Seobu Highway Solar Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 1,444
Effective percentage of ownership	20.00%
Share in net assets	₩ 289
Investment differential	0
Intercompany transaction	0
Others (consolidated FS)	0
Book value	289
Korea Energy Data Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 211
Effective percentage of ownership	29.37%
Share in net assets	₩ 62
Investment differential	0
Intercompany transaction	0
Others (consolidated FS)	0
Book value	62		0
Gangneung Sacheon Fuel Cell Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 2,755
Effective percentage of ownership	65.00%
Share in net assets	₩ 1,791
Investment differential	87
Intercompany transaction	0
Others (consolidated FS)	0
Book value	1,878		0
Kosture Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 124
Effective percentage of ownership	0.26%
Share in net assets	₩ 0
Investment differential	0
Intercompany transaction	0
Others (consolidated FS)	0
Book value	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 (consolidated FS)	0
Book value	9,890	[3]	0
Taebaek Gadeoksan Wind Power Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 41,602
Effective percentage of ownership	39.65%
Share in net assets	₩ 16,495
Investment differential	0
Intercompany transaction	0
Others (consolidated FS)	0
Book value	16,495		0
Chuncheon Green Energy Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 4,881
Effective percentage of ownership	68.00%
Share in net assets	₩ 3,319
Investment differential	53
Intercompany transaction	0
Others (consolidated FS)	0
Book value	3,372	[4]	0
Yeomsubong Wind Power Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 4
Effective percentage of ownership	48.72%
Share in net assets	₩ 2
Investment differential	93
Intercompany transaction	0
Others (consolidated FS)	0
Book value	95		0
Yeongyang Wind Power Corporation II
Disclosure of associates [line items]
Net assets	₩ 19,516
Effective percentage of ownership	30.00%
Share in net assets	₩ 5,855
Investment differential	2,110
Intercompany transaction	0
Others (consolidated FS)	0
Book value	7,965		0
Haeparang Energy Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 8,885
Effective percentage of ownership	25.00%
Share in net assets	₩ 2,221
Investment differential	20
Intercompany transaction	0
Others (consolidated FS)	0
Book value	2,241		0
Saemangeum Sebit Power Plant Co., Ltd.
Disclosure of associates [line items]
Net assets	₩ 8,296
Effective percentage of ownership	69.55%
Share in net assets	₩ 5,770
Investment differential	230
Intercompany transaction	0
Others (consolidated FS)	0
Book value	₩ 6,000	[4]	₩ 0
[1]	The effective percentage of ownership is 22.02% considering treasury stocks.
[2]	According to the shareholders’ agreement, additional investment of 50% of total stake is agreed by March 2022.
[3]	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.
[4]	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.

Investments in Joint Ventures 1

Investments in Joint Ventures 1 (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021		Dec. 31, 2020	Dec. 31, 2019
Disclosure of joint ventures [line items]
Acquisition cost	₩ 2,069,491		₩ 1,943,392
Total acquisition cost	5,129,326		4,425,153
Book value [Abstract]
Total book value	7,471,384		6,170,533
Book value	₩ 2,239,011		₩ 1,919,746	₩ 1,663,029
KEPCO-Uhde Inc.
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Korea		Korea
Percentage of ownership	52.80%	[1]	52.80%
Acquisition cost	₩ 11,355	[1]	₩ 11,355
Book value [Abstract]
Book value	₩ 58	[1]	₩ 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	49.00%		49.00%
Acquisition cost	₩ 44,405		₩ 44,405
Book value [Abstract]
Book value	₩ 37,069		₩ 13,264	18,318
Shuweihat Asia Operation & Maintenance Company
Disclosure of joint ventures [line items]
Key operation activities	Maintenance of utility plant	[1]	Maintenance of utility plant
Location	Cayman	[1]	Cayman
Percentage of ownership	55.00%	[1]	55.00%
Acquisition cost	₩ 30	[1]	₩ 30
Book value [Abstract]
Book value	₩ 1,380	[1]	₩ 1,057	1,408
Waterbury Lake Uranium L.P.
Disclosure of joint ventures [line items]
Key operation activities	Resources development		Resources development
Location	Canada		Canada
Percentage of ownership	33.10%		33.10%
Acquisition cost	₩ 26,602		₩ 26,602
Book value [Abstract]
Book value	₩ 21,590		₩ 19,797	20,562
ASM-BG Investicii AD
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Bulgaria		Bulgaria
Percentage of ownership	50.00%		50.00%
Acquisition cost	₩ 16,101		₩ 16,101
Book value [Abstract]
Book value	₩ 18,692		₩ 18,200	19,376
RES Technology AD
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Bulgaria		Bulgaria
Percentage of ownership	50.00%		50.00%
Acquisition cost	₩ 15,595		₩ 15,595
Book value [Abstract]
Book value	₩ 16,703		₩ 15,930	16,248
KV Holdings, Inc.
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Philippines		Philippines
Percentage of ownership	40.00%		40.00%
Acquisition cost	₩ 2,103		₩ 2,103
Book value [Abstract]
Book value	₩ 2,527		₩ 2,405	2,441
KEPCO SPC Power Corporation
Disclosure of joint ventures [line items]
Key operation activities	Construction and operation of utility plant	[1]	Construction and operation of utility plant
Location	Philippines	[1]	Philippines
Percentage of ownership	75.20%	[1]	75.20%
Acquisition cost	₩ 94,579	[1]	₩ 94,579
Book value [Abstract]
Book value	₩ 198,979	[1]	₩ 201,663	214,794
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	40.00%		40.00%
Acquisition cost	₩ 16,621		₩ 16,621
Book value [Abstract]
Book value	₩ 6,635		₩ 6,530	8,149
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	40.00%		40.00%
Acquisition cost	₩ 121,928		₩ 121,928
Book value [Abstract]
Book value	₩ 204,587		₩ 188,478	185,307
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	40.00%		40.00%
Acquisition cost	₩ 39,872		₩ 39,872
Book value [Abstract]
Book value	₩ 44,217		₩ 42,530	41,024
Rabigh Electricity Company
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Saudi Arabia		Saudi Arabia
Percentage of ownership	40.00%		40.00%
Acquisition cost	₩ 109,743		₩ 109,743
Book value [Abstract]
Book value	₩ 143,678		₩ 97,157	109,096
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	40.00%		40.00%
Acquisition cost	₩ 70		₩ 70
Book value [Abstract]
Book value	₩ 4,071		₩ 3,813	6,879
Jamaica Public Service Company Limited
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Jamaica		Jamaica
Percentage of ownership	40.00%		40.00%
Acquisition cost	₩ 301,910		₩ 301,910
Book value [Abstract]
Book value	₩ 294,649		₩ 266,221	253,607
KW Nuclear Components Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	Manufacturing		Manufacturing
Location	Korea		Korea
Percentage of ownership	45.00%		45.00%
Acquisition cost	₩ 833		₩ 833
Book value [Abstract]
Book value	₩ 15,734		₩ 11,171	9,052
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	25.00%		25.00%
Acquisition cost	₩ 2,100		₩ 2,100
Book value [Abstract]
Book value	₩ 5,841		₩ 5,378	5,045
Global Trade Of Power System Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	Exporting products and technology of small or medium business by proxy		Exporting products and technology of small or medium business by proxy
Location	Korea		Korea
Percentage of ownership	29.00%		29.00%
Acquisition cost	₩ 290		₩ 290
Book value [Abstract]
Book value	₩ 597		₩ 546	571
Expressway Solar-light Power Generation Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Korea		Korea
Percentage of ownership	29.00%		29.00%
Acquisition cost	₩ 1,856		₩ 1,856
Book value [Abstract]
Book value	₩ 3,084		₩ 2,896	2,883
Amman Asia Electric Power Company
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Jordan		Jordan
Percentage of ownership	60.00%		60.00%
Acquisition cost	₩ 111,476		₩ 111,476
Book value [Abstract]
Book value	₩ 178,679		₩ 161,253	192,164
KAPES, Inc.
Disclosure of joint ventures [line items]
Key operation activities	R & D		R & D
Location	Korea		Korea
Percentage of ownership	51.00%		51.00%
Acquisition cost	₩ 5,629		₩ 5,629
Book value [Abstract]
Book value	₩ 0		₩ 0	10,832
Honam Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Korea		Korea
Percentage of ownership	29.00%		29.00%
Acquisition cost	₩ 3,480		₩ 3,480
Book value [Abstract]
Book value	4,041		₩ 3,887	4,375
Jeongam Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities			Power generation
Location			Korea
Percentage of ownership			40.00%
Acquisition cost			₩ 5,580
Book value [Abstract]
Book value	₩ 0		₩ 4,620	4,437
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	29.00%		29.00%
Acquisition cost	₩ 290		₩ 290
Book value [Abstract]
Book value	₩ 5,415		₩ 5,362	4,902
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	₩ 25,896		₩ 27,518	34,872
Yeonggwangbaeksu Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Korea		Korea
Percentage of ownership	15.00%		15.00%
Acquisition cost	₩ 3,000		₩ 3,000
Book value [Abstract]
Book value	₩ 2,728		₩ 3,124	3,040
Nghi Son 2 Power LLC
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Vietnam		Vietnam
Percentage of ownership	50.00%		50.00%
Acquisition cost	₩ 2,781		₩ 2,781
Book value [Abstract]
Book value	₩ 0		₩ 0	0
Kelar S.A
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Chile		Chile
Percentage of ownership	65.00%		65.00%
Acquisition cost	₩ 78,060		₩ 78,060
Book value [Abstract]
Book value	₩ 86,695		₩ 71,449	70,462
PT. Tanjung Power Indonesia
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Indonesia		Indonesia
Percentage of ownership	35.00%		35.00%
Acquisition cost	₩ 26,892		₩ 26,892
Book value [Abstract]
Book value	₩ 46,546		₩ 33,063	34,327
Incheon New Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Korea		Korea
Percentage of ownership	29.00%		29.00%
Acquisition cost	₩ 461		₩ 461
Book value [Abstract]
Book value	₩ 0		₩ 0	0
Seokmun Energy Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Korea		Korea
Percentage of ownership	29.00%		29.00%
Acquisition cost	₩ 15,370		₩ 15,370
Book value [Abstract]
Book value	₩ 13,842		₩ 14,814	17,342
Daehan Wind Power PSC
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Jordan		Jordan
Percentage of ownership	50.00%		50.00%
Acquisition cost	₩ 7,493		₩ 7,493
Book value [Abstract]
Book value	₩ 5,154		₩ 0	1,757
Barakah One Company
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	UAE		UAE
Percentage of ownership	18.00%		18.00%
Acquisition cost	₩ 118		₩ 118
Book value [Abstract]
Book value	₩ 0		₩ 0	0
Nawah Energy Company
Disclosure of joint ventures [line items]
Key operation activities	Operation of utility plant		Operation of utility plant
Location	UAE		UAE
Percentage of ownership	18.00%		18.00%
Acquisition cost	₩ 296		₩ 296
Book value [Abstract]
Book value	₩ 294		₩ 270	285
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	₩ 368		₩ 565	553
Daegu Green Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Korea		Korea
Percentage of ownership	29.00%		29.00%
Acquisition cost	₩ 46,225		₩ 46,225
Book value [Abstract]
Book value	₩ 24,054		₩ 23,045	22,824
Yeonggwang Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Korea		Korea
Percentage of ownership	46.00%		46.00%
Acquisition cost	₩ 17,475		₩ 17,475
Book value [Abstract]
Book value	₩ 17,646		₩ 17,256	17,627
Chester Solar IV SpA
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Chile		Chile
Percentage of ownership	45.00%		45.00%
Acquisition cost	₩ 1,700		₩ 1,700
Book value [Abstract]
Book value	₩ 0		₩ 1,064	672
Chester Solar V SpA
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Chile		Chile
Percentage of ownership	45.00%		45.00%
Acquisition cost	₩ 525		₩ 525
Book value [Abstract]
Book value	₩ 25		₩ 277	146
Diego de Almagro Solar SpA
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Chile		Chile
Percentage of ownership	45.00%		45.00%
Acquisition cost	₩ 2,091		₩ 2,091
Book value [Abstract]
Book value	₩ 362		₩ 1,490	1,035
South Jamaica Power Company Limited
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Jamaica		Jamaica
Percentage of ownership	20.00%		20.00%
Acquisition cost	₩ 20,430		₩ 20,521
Book value [Abstract]
Book value	₩ 37,360		₩ 31,897	13,863
Daesan Green Energy Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Korea		Korea
Percentage of ownership	35.00%		35.00%
Acquisition cost	₩ 17,850		₩ 17,850
Book value [Abstract]
Book value	₩ 21,244		₩ 22,552	17,182
RE Holiday Holdings LLC
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	USA		USA
Percentage of ownership	50.00%		50.00%
Acquisition cost	₩ 42,948		₩ 42,948
Book value [Abstract]
Book value	₩ 73,167		₩ 68,809	42,070
RE Pioneer Holdings LLC
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	USA		USA
Percentage of ownership	50.00%		50.00%
Acquisition cost	₩ 27,891		₩ 27,891
Book value [Abstract]
Book value	₩ 47,015		₩ 49,639	31,156
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	50.00%		50.00%
Acquisition cost	₩ 28,021		₩ 28,021
Book value [Abstract]
Book value	₩ 1,883		₩ 4,466	42,916
RE Astoria 2 LandCo LLC
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	USA		USA
Percentage of ownership	50.00%		50.00%
Acquisition cost	₩ 5,188		₩ 5,188
Book value [Abstract]
Book value	₩ 5,998		₩ 5,230	5,602
RE Barren Ridge LandCo LLC
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	USA		USA
Percentage of ownership	50.00%		50.00%
Acquisition cost	₩ 2,187		₩ 2,187
Book value [Abstract]
Book value	₩ 2,120		₩ 1,847	1,966
Laurel SpA
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Chile		Chile
Percentage of ownership	45.00%		45.00%
Acquisition cost	₩ 1,222		₩ 1,222
Book value [Abstract]
Book value	₩ 290		₩ 1,092	595
KIAMCO KOWEPO Bannerton Hold Co Pty Ltd
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Australia		Australia
Percentage of ownership	12.37%		12.37%
Acquisition cost	₩ 4,095		₩ 4,095
Book value [Abstract]
Book value	₩ 3,625		₩ 4,129	4,024
Chile Solar JV SpA
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Chile		Chile
Percentage of ownership	50.00%		50.00%
Acquisition cost	₩ 37,689		₩ 37,689
Book value [Abstract]
Book value	32,457		₩ 34,883	34,859
Taebaek Gadeoksan Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities			Power generation
Location			Korea
Percentage of ownership			47.31%
Acquisition cost			₩ 12,570
Book value [Abstract]
Book value	₩ 0		₩ 13,362	7,846
Cheong-Song Noraesan Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Korea		Korea
Percentage of ownership	29.01%		29.01%
Acquisition cost	₩ 3,200		₩ 3,200
Book value [Abstract]
Book value	₩ 4,106		₩ 3,453	3,043
Chester Solar I SpA
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Chile		Chile
Percentage of ownership	45.00%		45.00%
Acquisition cost	₩ 1,181		₩ 1,181
Book value [Abstract]
Book value	₩ 1,120		₩ 1,621	1,157
Solar Philippines Calatagan Corporation
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Philippines		Philippines
Percentage of ownership	38.00%		38.00%
Acquisition cost	₩ 47,903		₩ 47,903
Book value [Abstract]
Book value	₩ 58,231		₩ 49,017	48,930
Saemangeum Solar Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Korea		Korea
Percentage of ownership	81.01%		81.00%
Acquisition cost	₩ 26,400		₩ 26,399
Book value [Abstract]
Book value	₩ 23,939		₩ 24,292	8,324
Chungsongmeon BongSan wind power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Korea		Korea
Percentage of ownership	29.00%		29.00%
Acquisition cost	₩ 2,900		₩ 2,900
Book value [Abstract]
Book value	₩ 3,808		₩ 4,124	2,764
Jaeun Resident Wind Power Plant Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Korea		Korea
Percentage of ownership	29.00%		29.00%
Acquisition cost	₩ 2,494		₩ 2,494
Book value [Abstract]
Book value	₩ 1,958		₩ 2,195	2,198
DE Energia SpA
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Chile		Chile
Percentage of ownership	49.00%		49.00%
Acquisition cost	₩ 8,364		₩ 8,364
Book value [Abstract]
Book value	₩ 8,921		₩ 8,187	8,665
Dangjin Eco Power Co., Ltd. (newly)
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Korea		Korea
Percentage of ownership	34.00%		34.00%
Acquisition cost	₩ 25,661		₩ 25,661
Book value [Abstract]
Book value	₩ 26,109		₩ 25,523	25,661
Haemodum Solar Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Korea		Korea
Percentage of ownership	49.00%		49.00%
Acquisition cost	₩ 2,940		₩ 2,940
Book value [Abstract]
Book value	₩ 3,081		₩ 3,065	2,940
Yangyang Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Korea		Korea
Percentage of ownership	50.00%		50.00%
Acquisition cost	₩ 12,000		₩ 10,800
Book value [Abstract]
Book value	₩ 11,191		₩ 10,485	10,800
Horus Solar S.A. De C.V.
Disclosure of joint ventures [line items]
Key operation activities	Renewable power generation		Renewable power generation
Location	Mexico		Mexico
Percentage of ownership	14.95%		14.95%
Acquisition cost	₩ 5,068		₩ 5,068
Book value [Abstract]
Book value	₩ 5,842		₩ 3,394	3,403
Recursos Solares PV De Mexico II, S.S. De C.V.
Disclosure of joint ventures [line items]
Key operation activities	Renewable power generation		Renewable power generation
Location	Mexico		Mexico
Percentage of ownership	14.95%		14.95%
Acquisition cost	₩ 3,678		₩ 3,678
Book value [Abstract]
Book value	₩ 4,536		₩ 3,660	672
Sunmex Renovables, S.A. De C.V.
Disclosure of joint ventures [line items]
Key operation activities	Renewable power generation		Renewable power generation
Location	Mexico		Mexico
Percentage of ownership	14.95%		14.95%
Acquisition cost	₩ 1,678		₩ 307
Book value [Abstract]
Book value	₩ 1,610		₩ 240	222
Stavro Holding II AB
Disclosure of joint ventures [line items]
Key operation activities	Holding company		Holding company
Location	Sweden		Sweden
Percentage of ownership	20.00%		20.00%
Acquisition cost	₩ 17,615		₩ 8,829
Book value [Abstract]
Book value	₩ 17,627		₩ 9,277	5,625
Solaseado Solar Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Korea		Korea
Percentage of ownership	38.90%		38.90%
Acquisition cost	₩ 7,020		₩ 7,020
Book value [Abstract]
Book value	₩ 9,891		₩ 9,915	0
Yeongam Solar Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Korea		Korea
Percentage of ownership	19.00%		19.00%
Acquisition cost	₩ 6,460		₩ 6,460
Book value [Abstract]
Book value	₩ 6,838		₩ 6,042	0
Samsu Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Korea		Korea
Percentage of ownership	19.00%		19.00%
Acquisition cost	₩ 2,637		₩ 2,637
Book value [Abstract]
Book value	₩ 2,828		₩ 2,607	0
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	25.00%		25.00%
Acquisition cost	₩ 23,833		₩ 11,569
Book value [Abstract]
Book value	₩ 22,099		₩ 11,204	0
Sam-Yang Photovoltaic Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Korea		Korea
Percentage of ownership	49.00%		49.00%
Acquisition cost	₩ 5,245		₩ 5,245
Book value [Abstract]
Book value	₩ 4,993		₩ 5,535	0
NH-Amundi Global Infrastructure Investment Private Investment Trust 21
Disclosure of joint ventures [line items]
Key operation activities	Holding company		Holding company
Location	Korea		Korea
Percentage of ownership	29.53%		29.53%
Acquisition cost	₩ 19,983		₩ 20,952
Book value [Abstract]
Book value	₩ 21,456		₩ 22,242	0
Shin-han BNPP Private Investment Trust for East-West Sunlight Dream
Disclosure of joint ventures [line items]
Key operation activities	Holding company		Holding company
Location	Korea		Korea
Percentage of ownership	90.00%		90.00%
Acquisition cost	₩ 15,699		₩ 15,699
Book value [Abstract]
Book value	₩ 16,288		₩ 16,129	0
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	₩ 59,535		₩ 59,395
Book value [Abstract]
Book value	₩ 81,595		₩ 63,029	0
Cheongna Energy Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	Generating and distributing vapor and hot/cold water		Generating and distributing vapor and hot/cold water
Location	Korea		Korea
Percentage of ownership	50.10%		50.10%
Acquisition cost	₩ 49,344		₩ 49,344
Book value [Abstract]
Book value	₩ 11,198		₩ 4,940	0
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. (formerly, Hyundai Energy Co., Ltd.)
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Korea		Korea
Percentage of ownership	30.66%		30.66%
Acquisition cost	₩ 71,070		₩ 71,070
Book value [Abstract]
Book value	₩ 0		₩ 0	0
OneEnergy Asia Limited
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Vietnam		Vietnam
Percentage of ownership	40.00%		40.00%
Acquisition cost	₩ 76,916		₩ 56,654
Book value [Abstract]
Book value	₩ 79,700		₩ 56,654	0
KAS Investment I LLC
Disclosure of joint ventures [line items]
Key operation activities	Holding company		Holding company
Location	USA		USA
Percentage of ownership	29.89%		29.89%
Acquisition cost	₩ 23,437		₩ 23,437
Book value [Abstract]
Book value	₩ 15,273		₩ 23,437	0
KAS Investment II LLC
Disclosure of joint ventures [line items]
Key operation activities	Holding company		Holding company
Location	USA		USA
Percentage of ownership	29.89%		29.89%
Acquisition cost	₩ 23,343		₩ 23,343
Book value [Abstract]
Book value	15,213		₩ 23,343	0
Energyco LLC
Disclosure of joint ventures [line items]
Key operation activities			Power generation
Location			Korea
Percentage of ownership			29.00%
Acquisition cost			₩ 1,659
Book value [Abstract]
Book value	₩ 1,535		₩ 1,659	0
CAES, LLC
Disclosure of joint ventures [line items]
Key operation activities	Holding company		Holding company
Location	USA		USA
Percentage of ownership	36.00%		36.00%
Acquisition cost	₩ 19,414		₩ 19,414
Book value [Abstract]
Book value	₩ 18,435		₩ 17,626	0
Hapcheon Floating Photovoltaic Power Plant Inc.
Disclosure of joint ventures [line items]
Key operation activities	Power generation		Power generation
Location	Korea		Korea
Percentage of ownership	49.00%		19.47%
Acquisition cost	₩ 7,512		₩ 1,890
Book value [Abstract]
Book value	₩ 6,971		₩ 1,890	0
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	₩ 612		₩ 510	0
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	₩ 0
Energyco Co., Ltd. (formerly, Energyco LLC)
Disclosure of joint ventures [line items]
Key operation activities	Power generation
Location	Korea
Percentage of ownership	29.00%
Acquisition cost	₩ 1,659
Book value [Abstract]
Book value	₩ 1,535
Pulau Indah O&M Sdn. Bhd.
Disclosure of joint ventures [line items]
Key operation activities	Power generation
Location	Malaysia
Percentage of ownership	60.00%
Acquisition cost	₩ 0
Book value [Abstract]
Book value	₩ 0
Guadalupe Solar SpA
Disclosure of joint ventures [line items]
Key operation activities	Power generation
Location	Chile
Percentage of ownership	60.00%
Acquisition cost	₩ 1,397
Book value [Abstract]
Book value	₩ 659		0
Omisan Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	Power generation
Location	Korea
Percentage of ownership	42.00%
Acquisition cost	₩ 10,752
Book value [Abstract]
Book value	₩ 10,633		0
Foresight Iberian Solar Group Holding, S.L
Disclosure of joint ventures [line items]
Key operation activities	Power generation
Location	Spain
Percentage of ownership	75.00%
Acquisition cost	₩ 9,697
Book value [Abstract]
Book value	₩ 9,743
Yeongwol Eco Wind Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	Power generation
Location	Korea
Percentage of ownership	29.00%
Acquisition cost	₩ 3,089
Book value [Abstract]
Book value	₩ 3,196		0
Gurae Resident Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	Power generation
Location	Korea
Percentage of ownership	29.00%
Acquisition cost	₩ 386
Book value [Abstract]
Book value	₩ 395		0
Cheongju Eco Park Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	Power generation
Location	Korea
Percentage of ownership	29.00%
Acquisition cost	₩ 5,858
Book value [Abstract]
Book value	₩ 5,465		0
Enel X Midland Photovoltaic, LLC
Disclosure of joint ventures [line items]
Key operation activities	Power generation
Location	Korea
Percentage of ownership	20.00%
Acquisition cost	₩ 1,695
Book value [Abstract]
Book value	₩ 1,688		0
Geumsungsan Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	Power generation
Location	Korea
Percentage of ownership	29.00%
Acquisition cost	₩ 6,531
Book value [Abstract]
Book value	₩ 6,053		0
KEPCO KPS Carabao Corp.
Disclosure of joint ventures [line items]
Key operation activities	Utility plant maintenance
Location	Philippines
Percentage of ownership	40.00%
Acquisition cost	₩ 93
Book value [Abstract]
Book value	₩ 386		0
Prime Swedish Holding AB
Disclosure of joint ventures [line items]
Key operation activities	Holding company
Location	Sweden
Percentage of ownership	45.00%
Acquisition cost	₩ 14,514
Book value [Abstract]
Book value	₩ 15,441		0
Goheung New Energy Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	Power generation
Location	Korea
Percentage of ownership	46.15%
Acquisition cost	₩ 12,959
Book value [Abstract]
Book value	₩ 11,708		0
Gunsan Land Solar Co., Ltd.
Disclosure of joint ventures [line items]
Key operation activities	Power generation
Location	Korea
Percentage of ownership	75.29%
Acquisition cost	₩ 19,091
Book value [Abstract]
Book value	₩ 19,317		0
Capman Lynx SCA, SICAR
Disclosure of joint ventures [line items]
Key operation activities	Holding company
Location	Luxembourg
Percentage of ownership	50.00%
Acquisition cost	₩ 9,601
Book value [Abstract]
Book value	₩ 9,976		0
International Offshore Power Transmission Holding Company Limited
Disclosure of joint ventures [line items]
Key operation activities	Undersea transmission network operation
Location	UAE
Percentage of ownership	35.00%
Acquisition cost	₩ 0
Book value [Abstract]
Book value	₩ 0		₩ 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.

Investments in Joint Ventures 2

Investments in Joint Ventures 2 (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021		Dec. 31, 2020
Book value [Abstract]
Beginning balance	₩ 1,919,746		₩ 1,663,029
Acquisition	134,959		289,068
Disposal	(11,710)		0
Dividends received	(139,847)		(139,519)
Share of income (loss)	139,933		220,032
Other comprehensive income (loss)	190,305		(113,377)
Others (book value)	5,625		513
Ending balance	2,239,011		1,919,746
Beginning balance	6,170,533		5,914,831
Acquisition	703,612		385,323
Disposal	(15,194)		(207)
Dividends received	(288,242)		(237,694)
Share of income (loss)	557,056		279,124
Other comprehensive income (loss)	352,056		(162,288)
Others (book value)	(8,437)		(8,556)
Ending balance	7,471,384		6,170,533
KEPCO-Uhde Inc.
Book value [Abstract]
Beginning balance	100
Acquisition	0
Disposal	0
Dividends received	0
Share of income (loss)	(42)
Other comprehensive income (loss)	0
Others (book value)	0
Ending balance	58	[1]	100
KEPCO-Uhde Inc.
Book value [Abstract]
Beginning balance	100		134
Acquisition			0
Disposal			0
Dividends received			0
Share of income (loss)			(34)
Other comprehensive income (loss)			0
Others (book value)			0
Ending balance	58		100
Shuweihat Asia Power Investment B.V.
Book value [Abstract]
Beginning balance	13,264		18,318
Acquisition	0		0
Disposal	0		0
Dividends received	(2,467)		(4,337)
Share of income (loss)	4,564		5,919
Other comprehensive income (loss)	21,708		(6,636)
Others (book value)	0		0
Ending balance	37,069		13,264
Shuweihat Asia Operation & Maintenance Company
Book value [Abstract]
Beginning balance	1,057		1,408
Acquisition	0		0
Disposal	0		0
Dividends received	(881)		(922)
Share of income (loss)	1,101		1,074
Other comprehensive income (loss)	103		(503)
Others (book value)	0		0
Ending balance	1,380	[1]	1,057
Waterbury Lake Uranium L.P.
Book value [Abstract]
Beginning balance	19,797		20,562
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	0		4
Other comprehensive income (loss)	1,793		(769)
Others (book value)	0		0
Ending balance	21,590		19,797
ASM-BG Investicii AD
Book value [Abstract]
Beginning balance	18,200		19,376
Acquisition	0		0
Disposal	0		0
Dividends received	(2,703)		(4,206)
Share of income (loss)	2,700		2,575
Other comprehensive income (loss)	495		455
Others (book value)	0		0
Ending balance	18,692		18,200
RES Technology AD
Book value [Abstract]
Beginning balance	15,930		16,248
Acquisition	0		0
Disposal	0		0
Dividends received	(676)		(1,981)
Share of income (loss)	1,116		1,051
Other comprehensive income (loss)	333		612
Others (book value)	0		0
Ending balance	16,703		15,930
KV Holdings, Inc.
Book value [Abstract]
Beginning balance	2,405		2,441
Acquisition	0		0
Disposal	0		0
Dividends received	(901)		(617)
Share of income (loss)	962		580
Other comprehensive income (loss)	61		1
Others (book value)	0		0
Ending balance	2,527		2,405
KEPCO SPC Power Corporation
Book value [Abstract]
Beginning balance	201,663		214,794
Acquisition	0		0
Disposal	0		0
Dividends received	(35,763)		(48,486)
Share of income (loss)	37,073		48,479
Other comprehensive income (loss)	(3,994)		(12,995)
Others (book value)	0		(129)
Ending balance	198,979	[1]	201,663
Gansu Datang Yumen Wind Power Co., Ltd.
Book value [Abstract]
Beginning balance	6,530		8,149
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	(619)		(1,718)
Other comprehensive income (loss)	724		99
Others (book value)	0		0
Ending balance	6,635		6,530
Datang Chifeng Renewable Power Co., Ltd.
Book value [Abstract]
Beginning balance	188,478		185,307
Acquisition	0		0
Disposal	0		0
Dividends received	(14,191)		(13,453)
Share of income (loss)	9,342		15,317
Other comprehensive income (loss)	20,958		1,307
Others (book value)	0		0
Ending balance	204,587		188,478
Datang KEPCO Chaoyang Renewable Power Co., Ltd.
Book value [Abstract]
Beginning balance	42,530		41,024
Acquisition	0		0
Disposal	0		0
Dividends received	(2,884)		0
Share of income (loss)	1,562		1,231
Other comprehensive income (loss)	3,009		275
Others (book value)	0		0
Ending balance	44,217		42,530
Rabigh Electricity Company
Book value [Abstract]
Beginning balance	97,157		109,096
Acquisition	0		0
Disposal	0		0
Dividends received	(7,221)		(14,956)
Share of income (loss)	17,896		25,474
Other comprehensive income (loss)	35,846		(22,458)
Others (book value)	0		1
Ending balance	143,678		97,157
Rabigh Operation & Maintenance Company Limited
Book value [Abstract]
Beginning balance	3,813		6,879
Acquisition	0		0
Disposal	0		0
Dividends received	(4,085)		(5,340)
Share of income (loss)	3,489		2,788
Other comprehensive income (loss)	854		(514)
Others (book value)	0		0
Ending balance	4,071		3,813
Jamaica Public Service Company Limited
Book value [Abstract]
Beginning balance	266,221		253,607
Acquisition	0		0
Disposal	0		0
Dividends received	(4,578)		(4,352)
Share of income (loss)	12,963		24,669
Other comprehensive income (loss)	23,820		(10,891)
Others (book value)	(3,777)		3,188
Ending balance	294,649		266,221
KW Nuclear Components Co., Ltd.
Book value [Abstract]
Beginning balance	11,171		9,052
Acquisition	0		0
Disposal	0		0
Dividends received	(833)		(833)
Share of income (loss)	5,396		2,952
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	15,734		11,171
Busan Shinho Solar Power Co., Ltd.
Book value [Abstract]
Beginning balance	5,378		5,045
Acquisition	0		0
Disposal	0		0
Dividends received	(352)		(330)
Share of income (loss)	815		663
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	5,841		5,378
Global Trade Of Power System Co., Ltd.
Book value [Abstract]
Beginning balance	546		571
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	51		(25)
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	597		546
Expressway Solar-light Power Generation Co., Ltd.
Book value [Abstract]
Beginning balance	2,896		2,883
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	188		13
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	3,084		2,896
Amman Asia Electric Power Company
Book value [Abstract]
Beginning balance	161,253		192,164
Acquisition	0		0
Disposal	0		0
Dividends received	(27,428)		(28,281)
Share of income (loss)	18,487		20,165
Other comprehensive income (loss)	26,367		(22,795)
Others (book value)	0		0
Ending balance	178,679		161,253
KAPES, Inc.
Book value [Abstract]
Beginning balance	0		10,832
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	0		(10,806)
Other comprehensive income (loss)	0		0
Others (book value)	0		(26)
Ending balance	0		0
Honam Wind Power Co., Ltd.
Book value [Abstract]
Beginning balance	3,887		4,375
Acquisition	0		0
Disposal	0		0
Dividends received	0		(435)
Share of income (loss)	154		(53)
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	4,041		3,887
Jeongam Wind Power Co., Ltd.
Book value [Abstract]
Beginning balance	4,620		4,437
Acquisition	5,808		0
Disposal	(10,741)		0
Dividends received	0		0
Share of income (loss)	313		183
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	0		4,620
Korea Power Engineering Service Co., Ltd.
Book value [Abstract]
Beginning balance	5,362		4,902
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	206		446
Other comprehensive income (loss)	0		0
Others (book value)	(153)		14
Ending balance	5,415		5,362
Chun-cheon Energy Co., Ltd.
Book value [Abstract]
Beginning balance	27,518		34,872
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	(1,622)		(7,354)
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	25,896		27,518
Yeonggwangbaeksu Wind Power Co., Ltd.
Book value [Abstract]
Beginning balance	3,124		3,040
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	(396)		84
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	2,728		3,124
Nghi Son 2 Power LLC
Book value [Abstract]
Beginning balance	0		0
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	0		0
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	0		0
Kelar S.A
Book value [Abstract]
Beginning balance	71,449		70,462
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	2,121		14,864
Other comprehensive income (loss)	6,416		(9,186)
Others (book value)	6,709		(4,691)
Ending balance	86,695		71,449
PT. Tanjung Power Indonesia
Book value [Abstract]
Beginning balance	33,063		34,327
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	5,027		7,522
Other comprehensive income (loss)	9,029		(9,220)
Others (book value)	(573)		434
Ending balance	46,546		33,063
Incheon New Power Co., Ltd.
Book value [Abstract]
Beginning balance	0		0
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	0		0
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	0		0
Seokmun Energy Co., Ltd.
Book value [Abstract]
Beginning balance	14,814		17,342
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	(972)		(2,528)
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	13,842		14,814
Daehan Wind Power PSC
Book value [Abstract]
Beginning balance	0		1,757
Acquisition	0		4,302
Disposal	0		0
Dividends received	0		0
Share of income (loss)	3,791		(626)
Other comprehensive income (loss)	1,363		(5,433)
Others (book value)	0		0
Ending balance	5,154		0
Barakah One Company
Book value [Abstract]
Beginning balance	0		0
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	0		0
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	0		0
Nawah Energy Company
Book value [Abstract]
Beginning balance	270		285
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	0		2
Other comprehensive income (loss)	24		(17)
Others (book value)	0		0
Ending balance	294		270
Momentum
Book value [Abstract]
Beginning balance	565		553
Acquisition	0		0
Disposal	0		0
Dividends received	(569)		(404)
Share of income (loss)	368		399
Other comprehensive income (loss)	4		17
Others (book value)	0		0
Ending balance	368		565
Daegu Green Power Co., Ltd.
Book value [Abstract]
Beginning balance	23,045		22,824
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	982		128
Other comprehensive income (loss)	0		0
Others (book value)	27		93
Ending balance	24,054		23,045
Yeonggwang Wind Power Co., Ltd.
Book value [Abstract]
Beginning balance	17,256		17,627
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	390		(371)
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	17,646		17,256
Chester Solar IV SpA
Book value [Abstract]
Beginning balance	1,064		672
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	(1,083)		389
Other comprehensive income (loss)	(36)		80
Others (book value)	55		(77)
Ending balance	0		1,064
Chester Solar V SpA
Book value [Abstract]
Beginning balance	277		146
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	(269)		135
Other comprehensive income (loss)	2		17
Others (book value)	15		(21)
Ending balance	25		277
Diego de Almagro Solar SpA
Book value [Abstract]
Beginning balance	1,490		1,035
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	(1,095)		455
Other comprehensive income (loss)	(123)		107
Others (book value)	90		(107)
Ending balance	362		1,490
South Jamaica Power Company Limited
Book value [Abstract]
Beginning balance	31,897		13,863
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	2,515		20,468
Other comprehensive income (loss)	2,949		(2,432)
Others (book value)	(1)		(2)
Ending balance	37,360		31,897
Daesan Green Energy Co., Ltd.
Book value [Abstract]
Beginning balance	22,552		17,182
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	(1,308)		5,371
Other comprehensive income (loss)	0		0
Others (book value)	0		(1)
Ending balance	21,244		22,552
RE Holiday Holdings LLC
Book value [Abstract]
Beginning balance	68,809		42,070
Acquisition	0		0
Disposal	0		0
Dividends received	(9,577)		0
Share of income (loss)	6,299		33,072
Other comprehensive income (loss)	7,636		(6,333)
Others (book value)	0		0
Ending balance	73,167		68,809
RE Pioneer Holdings LLC
Book value [Abstract]
Beginning balance	49,639		31,156
Acquisition	0		0
Disposal	0		0
Dividends received	(14,199)		(1,246)
Share of income (loss)	5,556		24,466
Other comprehensive income (loss)	6,019		(4,737)
Others (book value)	0		0
Ending balance	47,015		49,639
RE Barren Ridge 1 Holdings LLC
Book value [Abstract]
Beginning balance	4,466		42,916
Acquisition	0		0
Disposal	0		0
Dividends received	(1,365)		(872)
Share of income (loss)	(3,162)		(35,735)
Other comprehensive income (loss)	1,944		(1,843)
Others (book value)	0		0
Ending balance	1,883		4,466
RE Astoria 2 LandCo LLC
Book value [Abstract]
Beginning balance	5,230		5,602
Acquisition	0		0
Disposal	0		0
Dividends received	(337)		(249)
Share of income (loss)	619		210
Other comprehensive income (loss)	486		(333)
Others (book value)	0		0
Ending balance	5,998		5,230
RE Barren Ridge LandCo LLC
Book value [Abstract]
Beginning balance	1,847		1,966
Acquisition	0		0
Disposal	0		0
Dividends received	(140)		(95)
Share of income (loss)	240		95
Other comprehensive income (loss)	173		(119)
Others (book value)	0		0
Ending balance	2,120		1,847
Laurel SpA
Book value [Abstract]
Beginning balance	1,092		595
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	(798)		498
Other comprehensive income (loss)	(71)		80
Others (book value)	67		(81)
Ending balance	290		1,092
KIAMCO KOWEPO Bannerton Hold Co Pty Ltd
Book value [Abstract]
Beginning balance	4,129		4,024
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	(111)		(24)
Other comprehensive income (loss)	(393)		129
Others (book value)	0		0
Ending balance	3,625		4,129
Chile Solar JV SpA
Book value [Abstract]
Beginning balance	34,883		34,859
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	831		187
Other comprehensive income (loss)	(3,257)		(163)
Others (book value)	0		0
Ending balance	32,457		34,883
Taebaek Gadeoksan Wind Power Co., Ltd.
Book value [Abstract]
Beginning balance	13,362		7,846
Acquisition	0		4,070
Disposal	0		0
Dividends received	0		0
Share of income (loss)	762		1,468
Other comprehensive income (loss)	0		(22)
Others (book value)	(14,124)		0
Ending balance	0		13,362
Cheong-Song Noraesan Wind Power Co., Ltd.
Book value [Abstract]
Beginning balance	3,453		3,043
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	653		409
Other comprehensive income (loss)	0		0
Others (book value)	0		1
Ending balance	4,106		3,453
Chester Solar I SpA
Book value [Abstract]
Beginning balance	1,621		1,157
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	(430)		472
Other comprehensive income (loss)	(195)		107
Others (book value)	124		(115)
Ending balance	1,120		1,621
Solar Philippines Calatagan Corporation
Book value [Abstract]
Beginning balance	49,017		48,930
Acquisition	0		0
Disposal	0		0
Dividends received	(5,961)		(6,439)
Share of income (loss)	5,961		6,745
Other comprehensive income (loss)	9,214		(219)
Others (book value)	0		0
Ending balance	58,231		49,017
Saemangeum Solar Power Co., Ltd.
Book value [Abstract]
Beginning balance	24,292		8,324
Acquisition	1		16,399
Disposal	0		0
Dividends received	0		0
Share of income (loss)	(354)		(431)
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	23,939		24,292
Chungsongmeon BongSan wind power Co., Ltd.
Book value [Abstract]
Beginning balance	4,124		2,764
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	(316)		(232)
Other comprehensive income (loss)	0		1,592
Others (book value)	0		0
Ending balance	3,808		4,124
Jaeun Resident Wind Power Plant Co., Ltd.
Book value [Abstract]
Beginning balance	2,195		2,198
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	(237)		(3)
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	1,958		2,195
DE Energia SpA
Book value [Abstract]
Beginning balance	8,187		8,665
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	0		506
Other comprehensive income (loss)	734		572
Others (book value)	0		(1,556)
Ending balance	8,921		8,187
Dangjin Eco Power Co., Ltd. (newly)
Book value [Abstract]
Beginning balance	25,523		25,661
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	274		96
Other comprehensive income (loss)	312		(237)
Others (book value)	0		3
Ending balance	26,109		25,523
Haemodum Solar Co., Ltd.
Book value [Abstract]
Beginning balance	3,065		2,940
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	16		140
Other comprehensive income (loss)	0		(15)
Others (book value)	0		0
Ending balance	3,081		3,065
Yangyang Wind Power Co., Ltd.
Book value [Abstract]
Beginning balance	10,485		10,800
Acquisition	1,200		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	(488)		(286)
Other comprehensive income (loss)	(6)		(29)
Others (book value)	0		0
Ending balance	11,191		10,485
Horus Solar, S.A. De C.V.
Book value [Abstract]
Beginning balance	3,394		3,403
Acquisition	0		1,665
Disposal	0		0
Dividends received	0		0
Share of income (loss)	2,396		(1,985)
Other comprehensive income (loss)	52		311
Others (book value)	0		0
Ending balance	5,842		3,394
Recursos Solares PV De Mexico II, S.A. De C.V.
Book value [Abstract]
Beginning balance	3,660		672
Acquisition	0		3,006
Disposal	0		0
Dividends received	0		0
Share of income (loss)	766		36
Other comprehensive income (loss)	110		(54)
Others (book value)	0		0
Ending balance	4,536		3,660
Sunmex Renovables, S.A. De C.V.
Book value [Abstract]
Beginning balance	240		222
Acquisition	1,371		85
Disposal	0		0
Dividends received	0		0
Share of income (loss)	(49)		(46)
Other comprehensive income (loss)	48		(21)
Others (book value)	0		0
Ending balance	1,610		240
Stavro Holding II AB
Book value [Abstract]
Beginning balance	9,277		5,625
Acquisition	8,684		3,305
Disposal	0		0
Dividends received	0		0
Share of income (loss)	(55)		(156)
Other comprehensive income (loss)	(271)		346
Others (book value)	(8)		157
Ending balance	17,627		9,277
Solaseado Solar Power Co., Ltd.
Book value [Abstract]
Beginning balance	9,915		0
Acquisition	0		7,020
Disposal	0		0
Dividends received	0		0
Share of income (loss)	(24)		2,895
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	9,891		9,915
Yeongam Solar Power Co., Ltd.
Book value [Abstract]
Beginning balance	6,042		0
Acquisition	0		6,460
Disposal	0		0
Dividends received	0		0
Share of income (loss)	796		(418)
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	6,838		6,042
Samsu Wind Power Co., Ltd.
Book value [Abstract]
Beginning balance	2,607		0
Acquisition	0		2,637
Disposal	0		0
Dividends received	0		0
Share of income (loss)	221		(30)
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	2,828		2,607
Pulau Indah Power Plant Sdn. Bhd.
Book value [Abstract]
Beginning balance	11,204		0
Acquisition	12,264		11,569
Disposal	0		0
Dividends received	0		0
Share of income (loss)	(519)		(144)
Other comprehensive income (loss)	(850)		(221)
Others (book value)	0		0
Ending balance	22,099		11,204
Sam-Yang Photovoltaic Power Co., Ltd.
Book value [Abstract]
Beginning balance	5,535		0
Acquisition	0		5,245
Disposal	0		0
Dividends received	0		0
Share of income (loss)	(542)		290
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	4,993		5,535
NH-Amundi Global Infrastructure Investment Private Investment Trust 21
Book value [Abstract]
Beginning balance	22,242		0
Acquisition	0		20,952
Disposal	(969)		0
Dividends received	(1,727)		(1,388)
Share of income (loss)	1,910		2,678
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	21,456		22,242
Shin-han BNPP Private Investment Trust for East-West Sunlight Dream
Book value [Abstract]
Beginning balance	16,129		0
Acquisition	0		15,699
Disposal	0		0
Dividends received	0		0
Share of income (loss)	159		430
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	16,288		16,129
PT Barito Wahana Tenaga
Book value [Abstract]
Beginning balance	63,029		0
Acquisition	140		59,395
Disposal	0		0
Dividends received	0		0
Share of income (loss)	4,194		4,923
Other comprehensive income (loss)	14,232		(1,289)
Others (book value)	0		0
Ending balance	81,595		63,029
Cheongna Energy Co., Ltd.
Book value [Abstract]
Beginning balance	4,940		0
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	6,258		21
Other comprehensive income (loss)	0		0
Others (book value)	0		4,919
Ending balance	11,198		4,940
Naepo Green Energy Co., Ltd.
Book value [Abstract]
Beginning balance	0		0
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	0		0
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	0		0
Dayone Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.)
Book value [Abstract]
Beginning balance	0		0
Acquisition	0		0
Disposal	0		0
Dividends received	0		0
Share of income (loss)	0		0
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	0		0
OneEnergy Asia Limited
Book value [Abstract]
Beginning balance	56,654		0
Acquisition	20,262		56,654
Disposal	0		0
Dividends received	0		0
Share of income (loss)	(1,138)		0
Other comprehensive income (loss)	3,922		0
Others (book value)	0		0
Ending balance	79,700		56,654
KAS Investment I LLC
Book value [Abstract]
Beginning balance	23,437		0
Acquisition	0		23,437
Disposal	0		0
Dividends received	0		0
Share of income (loss)	(6,876)		0
Other comprehensive income (loss)	(1,288)		0
Others (book value)	0		0
Ending balance	15,273		23,437
KAS Investment II LLC
Book value [Abstract]
Beginning balance	23,343		0
Acquisition	0		23,343
Disposal	0		0
Dividends received	0		0
Share of income (loss)	(6,515)		0
Other comprehensive income (loss)	(1,615)		0
Others (book value)	0		0
Ending balance	15,213		23,343
Energyco LLC
Book value [Abstract]
Beginning balance	1,659		0
Acquisition	0		1,659
Disposal	0		0
Dividends received	0		0
Share of income (loss)	(60)		0
Other comprehensive income (loss)	(64)		0
Others (book value)	0		0
Ending balance	1,535		1,659
CAES, LLC
Book value [Abstract]
Beginning balance	17,626		0
Acquisition	0		19,414
Disposal	0		0
Dividends received	(1,009)		(297)
Share of income (loss)	(331)		0
Other comprehensive income (loss)	850		0
Others (book value)	1,299		(1,491)
Ending balance	18,435		17,626
Hapcheon Floating Photovoltaic Power Plant Inc.
Book value [Abstract]
Beginning balance	1,890		0
Acquisition	5,622		1,890
Disposal	0		0
Dividends received	0		0
Share of income (loss)	(541)		0
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	6,971		1,890
Busan Industrial Solar Power Co., Ltd.
Book value [Abstract]
Beginning balance	510		0
Acquisition	0		510
Disposal	0		0
Dividends received	0		0
Share of income (loss)	102		0
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	612		510
Bitsolar Energy Co., Ltd.,
Book value [Abstract]
Beginning balance	352		0
Acquisition	0		352
Disposal	0		0
Dividends received	0		0
Share of income (loss)	0		0
Other comprehensive income (loss)	0		0
Others (book value)	0		0
Ending balance	352		352
Pulau Indah O&M Sdn. Bhd.
Book value [Abstract]
Beginning balance	0
Acquisition	0
Disposal	0
Dividends received	0
Share of income (loss)	0
Other comprehensive income (loss)	0
Others (book value)	0
Ending balance	0		0
Guadalupe Solar SpA
Book value [Abstract]
Beginning balance	0
Acquisition	1,397
Disposal	0
Dividends received	0
Share of income (loss)	(672)
Other comprehensive income (loss)	(66)
Others (book value)	0
Ending balance	659		0
Omisan Wind Power Co., Ltd.
Book value [Abstract]
Beginning balance	0
Acquisition	10,752
Disposal	0
Dividends received	0
Share of income (loss)	(119)
Other comprehensive income (loss)	0
Others (book value)	0
Ending balance	10,633		0
Foresight Iberian Solar Group Holding, S.L.
Book value [Abstract]
Beginning balance	0
Acquisition	0
Disposal	0
Dividends received	0
Share of income (loss)	72
Other comprehensive income (loss)	0
Others (book value)	9,671
Ending balance	9,743		0
Yeongwol Eco Wind Co., Ltd.
Book value [Abstract]
Beginning balance	0
Acquisition	3,089
Disposal	0
Dividends received	0
Share of income (loss)	122
Other comprehensive income (loss)	(15)
Others (book value)	0
Ending balance	3,196		0
Gurae Resident Power Co., Ltd.
Book value [Abstract]
Beginning balance	0
Acquisition	386
Disposal	0
Dividends received	0
Share of income (loss)	12
Other comprehensive income (loss)	(3)
Others (book value)	0
Ending balance	395		0
Cheongju Eco Park Co., Ltd.
Book value [Abstract]
Beginning balance	0
Acquisition	5,858
Disposal	0
Dividends received	0
Share of income (loss)	(393)
Other comprehensive income (loss)	0
Others (book value)	0
Ending balance	5,465		0
Enel X Midland Photovoltaic, LLC
Book value [Abstract]
Beginning balance	0
Acquisition	1,695
Disposal	0
Dividends received	0
Share of income (loss)	(7)
Other comprehensive income (loss)	0
Others (book value)	0
Ending balance	1,688		0
Geumsungsan Wind Power Co., Ltd.
Book value [Abstract]
Beginning balance	0
Acquisition	6,531
Disposal	0
Dividends received	0
Share of income (loss)	(478)
Other comprehensive income (loss)	0
Others (book value)	0
Ending balance	6,053		0
KEPCO KPS Carabao Corp.
Book value [Abstract]
Beginning balance	0
Acquisition	93
Disposal	0
Dividends received	0
Share of income (loss)	293
Other comprehensive income (loss)	0
Others (book value)	0
Ending balance	386		0
Prime Swedish Holding AB
Book value [Abstract]
Beginning balance	0
Acquisition	8,155
Disposal	0
Dividends received	0
Share of income (loss)	22
Other comprehensive income (loss)	1,060
Others (book value)	6,204
Ending balance	15,441		0
Goheung New Energy Co., Ltd.
Book value [Abstract]
Beginning balance	0
Acquisition	12,959
Disposal	0
Dividends received	0
Share of income (loss)	(1,251)
Other comprehensive income (loss)	0
Others (book value)	0
Ending balance	11,708		0
Gunsan Land Solar Co., Ltd.
Book value [Abstract]
Beginning balance	0
Acquisition	19,091
Disposal	0
Dividends received	0
Share of income (loss)	324
Other comprehensive income (loss)	(98)
Others (book value)	0
Ending balance	19,317		0
Capman Lynx SCA, SICAR
Book value [Abstract]
Beginning balance	0
Acquisition	9,601
Disposal	0
Dividends received	0
Share of income (loss)	375
Other comprehensive income (loss)	0
Others (book value)	0
Ending balance	9,976		0
International Offshore Power Transmission Holding Company Limited
Book value [Abstract]
Beginning balance	0
Acquisition	0
Disposal	0
Dividends received	0
Share of income (loss)	0
Other comprehensive income (loss)	0
Others (book value)	0
Ending balance	₩ 0		₩ 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.

Investments in Joint Ventures 3

Investments in Joint Ventures 3 (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
KEPCO-Uhde Inc.
Disclosure of joint ventures [line items]
Total assets	₩ 128	₩ 208
Total liabilities	14	11
Sales of Joint Ventures	0	0
Profit (loss) for the period of JointVentures	(84)	(66)
Shuweihat Asia Power Investment B.V.
Disclosure of joint ventures [line items]
Total assets	75,652	27,073
Total liabilities	0	4
Sales of Joint Ventures	0	0
Profit (loss) for the period of JointVentures	23,905	12,080
Shuweihat Asia Operation & Maintenance Company
Disclosure of joint ventures [line items]
Total assets	2,586	1,960
Total liabilities	77	38
Sales of Joint Ventures	2,821	2,689
Profit (loss) for the period of JointVentures	2,002	1,953
Waterbury Lake Uranium L.P.
Disclosure of joint ventures [line items]
Total assets	65,240	59,885
Total liabilities	14	77
Sales of Joint Ventures	0	0
Profit (loss) for the period of JointVentures	0	0
ASM-BG Investicii AD
Disclosure of joint ventures [line items]
Total assets	74,977	80,261
Total liabilities	37,593	43,861
Sales of Joint Ventures	13,161	13,355
Profit (loss) for the period of JointVentures	5,365	5,150
RES Technology AD
Disclosure of joint ventures [line items]
Total assets	63,495	67,232
Total liabilities	30,090	35,372
Sales of Joint Ventures	8,142	8,381
Profit (loss) for the period of JointVentures	2,220	2,102
KV Holdings, Inc.
Disclosure of joint ventures [line items]
Total assets	6,318	6,013
Total liabilities	1	0
Sales of Joint Ventures	10	27
Profit (loss) for the period of JointVentures	2,405	1,449
KEPCO SPC Power Corporation
Disclosure of joint ventures [line items]
Total assets	290,981	289,271
Total liabilities	26,381	21,102
Sales of Joint Ventures	181,443	184,481
Profit (loss) for the period of JointVentures	49,499	66,311
Gansu Datang Yumen Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	75,268	69,668
Total liabilities	58,680	53,343
Sales of Joint Ventures	9,666	7,157
Profit (loss) for the period of JointVentures	(1,547)	(4,295)
Datang Chifeng Renewable Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	827,213	747,990
Total liabilities	315,746	276,796
Sales of Joint Ventures	120,989	119,955
Profit (loss) for the period of JointVentures	24,398	39,439
Datang KEPCO Chaoyang Renewable Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	198,437	182,342
Total liabilities	87,895	76,018
Sales of Joint Ventures	29,094	26,378
Profit (loss) for the period of JointVentures	3,905	2,914
Rabigh Electricity Company
Disclosure of joint ventures [line items]
Total assets	2,410,335	2,294,880
Total liabilities	1,910,203	1,898,701
Sales of Joint Ventures	266,822	293,722
Profit (loss) for the period of JointVentures	34,268	94,927
Rabigh Operation & Maintenance Company Limited
Disclosure of joint ventures [line items]
Total assets	29,107	28,666
Total liabilities	18,930	19,133
Sales of Joint Ventures	32,079	26,268
Profit (loss) for the period of JointVentures	9,808	7,318
Jamaica Public Service Company Limited
Disclosure of joint ventures [line items]
Total assets	2,174,800	1,664,412
Total liabilities	1,469,297	1,027,418
Sales of Joint Ventures	1,113,943	1,042,422
Profit (loss) for the period of JointVentures	41,277	35,916
KW Nuclear Components Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	42,033	44,571
Total liabilities	6,678	19,354
Sales of Joint Ventures	32,938	19,762
Profit (loss) for the period of JointVentures	12,335	7,262
Busan Shinho Solar Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	37,016	39,266
Total liabilities	13,653	17,754
Sales of Joint Ventures	7,918	7,296
Profit (loss) for the period of JointVentures	3,261	2,652
Global Trade Of Power System Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	2,443	2,319
Total liabilities	385	435
Sales of Joint Ventures	6,355	4,105
Profit (loss) for the period of JointVentures	76	(96)
Expressway Solar-light Power Generation Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	13,747	14,801
Total liabilities	3,113	4,816
Sales of Joint Ventures	2,637	2,298
Profit (loss) for the period of JointVentures	466	144
Amman Asia Electric Power Company
Disclosure of joint ventures [line items]
Total assets	731,745	725,101
Total liabilities	433,946	456,346
Sales of Joint Ventures	17,753	20,586
Profit (loss) for the period of JointVentures	30,815	33,608
KAPES, Inc.
Disclosure of joint ventures [line items]
Total assets	92,790	127,418
Total liabilities	59,099	95,322
Sales of Joint Ventures	87,775	167,201
Profit (loss) for the period of JointVentures	1,571	10,908
Honam Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	33,623	36,237
Total liabilities	19,800	22,945
Sales of Joint Ventures	5,395	4,433
Profit (loss) for the period of JointVentures	531	(220)
Jeongam Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets		89,829
Total liabilities		78,279
Sales of Joint Ventures		9,757
Profit (loss) for the period of JointVentures		412
Korea Power Engineering Service Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	24,068	24,162
Total liabilities	5,397	5,674
Sales of Joint Ventures	11,259	9,435
Profit (loss) for the period of JointVentures	709	1,538
Chun-cheon Energy Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	610,650	605,493
Total liabilities	523,223	512,642
Sales of Joint Ventures	327,534	222,066
Profit (loss) for the period of JointVentures	(5,451)	(24,597)
Yeonggwangbaeksu Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	82,439	90,758
Total liabilities	64,290	69,967
Sales of Joint Ventures	8,411	11,232
Profit (loss) for the period of JointVentures	(2,302)	572
Nghi Son 2 Power LLC
Disclosure of joint ventures [line items]
Total assets	2,982,805	2,207,764
Total liabilities	3,020,684	2,474,324
Sales of Joint Ventures	548,027	819,706
Profit (loss) for the period of JointVentures	84,276	108,832
Kelar S.A
Disclosure of joint ventures [line items]
Total assets	655,236	598,901
Total liabilities	526,063	492,838
Sales of Joint Ventures	84,504	93,375
Profit (loss) for the period of JointVentures	3,641	16,863
PT. Tanjung Power Indonesia
Disclosure of joint ventures [line items]
Total assets	713,715	645,152
Total liabilities	580,727	550,687
Sales of Joint Ventures	89,491	90,255
Profit (loss) for the period of JointVentures	14,511	20,487
Incheon New Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	3,240	3,439
Total liabilities	2,606	2,914
Sales of Joint Ventures	2,336	1,519
Profit (loss) for the period of JointVentures	109	(670)
Seokmun Energy Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	219,414	227,539
Total liabilities	171,682	176,457
Sales of Joint Ventures	41,555	33,677
Profit (loss) for the period of JointVentures	(3,434)	(8,734)
Daehan Wind Power PSC
Disclosure of joint ventures [line items]
Total assets	137,388	98,544
Total liabilities	127,080	106,254
Sales of Joint Ventures	6,794	0
Profit (loss) for the period of JointVentures	7,581	(765)
Barakah One Company
Disclosure of joint ventures [line items]
Total assets	29,707,801	24,693,571
Total liabilities	29,951,656	24,924,087
Sales of Joint Ventures	253,653	0
Profit (loss) for the period of JointVentures	4,011	(4,520)
Nawah Energy Company
Disclosure of joint ventures [line items]
Total assets	155,191	139,286
Total liabilities	153,559	137,788
Sales of Joint Ventures	0	0
Profit (loss) for the period of JointVentures	0	12
Momentum
Disclosure of joint ventures [line items]
Total assets	7,546	10,772
Total liabilities	6,442	9,076
Sales of Joint Ventures	34,527	31,161
Profit (loss) for the period of JointVentures	1,105	1,122
Daegu Green Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	541,304	549,034
Total liabilities	459,536	469,126
Sales of Joint Ventures	295,645	221,382
Profit (loss) for the period of JointVentures	1,796	290
Yeonggwang Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	239,701	249,999
Total liabilities	202,410	213,556
Sales of Joint Ventures	25,892	26,535
Profit (loss) for the period of JointVentures	958	1,690
Chester Solar IV SpA
Disclosure of joint ventures [line items]
Total assets	11,966	14,232
Total liabilities	12,144	11,990
Sales of Joint Ventures	1,344	1,688
Profit (loss) for the period of JointVentures	(2,060)	485
Chester Solar V SpA
Disclosure of joint ventures [line items]
Total assets	4,034	4,674
Total liabilities	4,256	4,313
Sales of Joint Ventures	440	588
Profit (loss) for the period of JointVentures	(601)	150
Diego de Almagro Solar SpA
Disclosure of joint ventures [line items]
Total assets	15,155	17,916
Total liabilities	14,572	14,808
Sales of Joint Ventures	1,615	1,824
Profit (loss) for the period of JointVentures	(2,103)	535
South Jamaica Power Company Limited
Disclosure of joint ventures [line items]
Total assets	474,664	405,804
Total liabilities	287,852	246,310
Sales of Joint Ventures	224,159	209,596
Profit (loss) for the period of JointVentures	5,743	12,208
Daesan Green Energy Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	264,618	275,911
Total liabilities	203,921	211,476
Sales of Joint Ventures	88,147	62,286
Profit (loss) for the period of JointVentures	(3,310)	15,346
RE Holiday Holdings LLC
Disclosure of joint ventures [line items]
Total assets	335,130	320,908
Total liabilities	188,796	183,290
Sales of Joint Ventures	19,724	19,659
Profit (loss) for the period of JointVentures	10,897	13,247
RE Pioneer Holdings LLC
Disclosure of joint ventures [line items]
Total assets	220,390	236,565
Total liabilities	126,361	137,287
Sales of Joint Ventures	12,925	12,410
Profit (loss) for the period of JointVentures	9,307	8,821
RE Barren Ridge 1 Holdings LLC
Disclosure of joint ventures [line items]
Total assets	201,629	194,643
Total liabilities	87,291	87,171
Sales of Joint Ventures	10,575	10,679
Profit (loss) for the period of JointVentures	(541)	(722)
RE Astoria 2 LandCo LLC
Disclosure of joint ventures [line items]
Total assets	12,294	10,733
Total liabilities	298	274
Sales of Joint Ventures	889	664
Profit (loss) for the period of JointVentures	799	541
RE Barren Ridge LandCo LLC
Disclosure of joint ventures [line items]
Total assets	4,328	3,776
Total liabilities	89	82
Sales of Joint Ventures	345	266
Profit (loss) for the period of JointVentures	315	223
Laurel SpA
Disclosure of joint ventures [line items]
Total assets	10,566	13,529
Total liabilities	10,350	11,496
Sales of Joint Ventures	1,159	1,704
Profit (loss) for the period of JointVentures	(1,425)	702
KIAMCO KOWEPO Bannerton Hold Co Pty Ltd
Disclosure of joint ventures [line items]
Total assets	30,809	33,930
Total liabilities	1,573	618
Sales of Joint Ventures	0	0
Profit (loss) for the period of JointVentures	(916)	(191)
Chile Solar JV SpA
Disclosure of joint ventures [line items]
Total assets	68,445	74,776
Total liabilities	3,531	5,011
Sales of Joint Ventures	3,060	4,390
Profit (loss) for the period of JointVentures	1,408	1,476
Taebaek Gadeoksan Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets		142,731
Total liabilities		114,487
Sales of Joint Ventures		10,587
Profit (loss) for the period of JointVentures		2,411
Cheong-Song Noraesan Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	57,047	55,460
Total liabilities	43,106	43,771
Sales of Joint Ventures	7,929	7,411
Profit (loss) for the period of JointVentures	2,309	2,039
Chester Solar I SpA
Disclosure of joint ventures [line items]
Total assets	12,965	12,795
Total liabilities	11,043	9,713
Sales of Joint Ventures	1,065	1,111
Profit (loss) for the period of JointVentures	(1,146)	824
Solar Philippines Calatagan Corporation
Disclosure of joint ventures [line items]
Total assets	117,324	97,947
Total liabilities	46,759	47,098
Sales of Joint Ventures	19,418	23,182
Profit (loss) for the period of JointVentures	11,782	15,249
Saemangeum Solar Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	35,323	34,363
Total liabilities	5,771	4,180
Sales of Joint Ventures	0	0
Profit (loss) for the period of JointVentures	(631)	(532)
Chungsongmeon BongSan wind power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	74,683	64,341
Total liabilities	67,696	56,264
Sales of Joint Ventures	0	0
Profit (loss) for the period of JointVentures	(1,186)	(1,206)
Jaeun Resident Wind Power Plant Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	81,477	63,940
Total liabilities	74,724	56,371
Sales of Joint Ventures	0	0
Profit (loss) for the period of JointVentures	(1,325)	(645)
DE Energia SpA
Disclosure of joint ventures [line items]
Total assets	49,201	48,327
Total liabilities	59,587	54,934
Sales of Joint Ventures	5,219	3,789
Profit (loss) for the period of JointVentures	(2,954)	(21,087)
Dangjin Eco Power Co., Ltd. (newly)
Disclosure of joint ventures [line items]
Total assets	98,010	97,834
Total liabilities	22,223	23,769
Sales of Joint Ventures	4,139	3,953
Profit (loss) for the period of JointVentures	805	565
Haemodum Solar Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	23,038	19,041
Total liabilities	16,750	12,786
Sales of Joint Ventures	1,799	1,188
Profit (loss) for the period of JointVentures	45	286
Yangyang Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	53,586	20,917
Total liabilities	31,291	33
Sales of Joint Ventures	0	0
Profit (loss) for the period of JointVentures	(965)	(572)
Horus Solar S.A. De C.V.
Disclosure of joint ventures [line items]
Total assets	192,650	181,432
Total liabilities	177,514	182,674
Sales of Joint Ventures	8,392	0
Profit (loss) for the period of JointVentures	16,664	(13,285)
Recursos Solares PV De Mexico II, S.S. De C.V.
Disclosure of joint ventures [line items]
Total assets	153,855	81,257
Total liabilities	138,033	71,295
Sales of Joint Ventures	0	0
Profit (loss) for the period of JointVentures	4,842	243
Sunmex Renovables, S.A. De C.V.
Disclosure of joint ventures [line items]
Total assets	90,956	7,781
Total liabilities	80,218	6,204
Sales of Joint Ventures	0	0
Profit (loss) for the period of JointVentures	(333)	(309)
Stavro Holding II AB
Disclosure of joint ventures [line items]
Total assets	88,220	46,394
Total liabilities	87	9
Sales of Joint Ventures	0	0
Profit (loss) for the period of JointVentures	(276)	(782)
Solaseado Solar Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	367,915	349,855
Total liabilities	345,987	327,865
Sales of Joint Ventures	41,684	43,782
Profit (loss) for the period of JointVentures	4,170	7,443
Yeongam Solar Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	324,132	312,960
Total liabilities	292,213	285,231
Sales of Joint Ventures	37,301	17,347
Profit (loss) for the period of JointVentures	4,930	(3,324)
Samsu Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	69,213	59,597
Total liabilities	54,331	45,877
Sales of Joint Ventures	3,918	0
Profit (loss) for the period of JointVentures	1,162	243
Pulau Indah Power Plant Sdn. Bhd.
Disclosure of joint ventures [line items]
Total assets	404,458	31,538
Total liabilities	338,635	9,293
Sales of Joint Ventures	228	0
Profit (loss) for the period of JointVentures	(2,589)	(894)
Sam-Yang Photovoltaic Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	50,837	55,345
Total liabilities	40,647	44,049
Sales of Joint Ventures	7,376	2,769
Profit (loss) for the period of JointVentures	150	592
NH-Amundi Global Infrastructure Investment Private Investment Trust 21
Disclosure of joint ventures [line items]
Total assets	70,910	73,573
Total liabilities	38	39
Sales of Joint Ventures	3,428	1,770
Profit (loss) for the period of JointVentures	6,468	8,989
Shin-han BNPP Private Investment Trust for East-West Sunlight Dream
Disclosure of joint ventures [line items]
Total assets	18,121	17,932
Total liabilities	23	11
Sales of Joint Ventures	333	6
Profit (loss) for the period of JointVentures	288	478
PT Barito Wahana Tenaga
Disclosure of joint ventures [line items]
Total assets	266,584	205,894
Total liabilities	39	0
Sales of Joint Ventures	0	0
Profit (loss) for the period of JointVentures	25,839	28,631
Cheongna Energy Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	357,248	341,478
Total liabilities	338,763	335,736
Sales of Joint Ventures	77,640	78,387
Profit (loss) for the period of JointVentures	12,743	5,995
Naepo Green Energy Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	222,885	152,003
Total liabilities	249,415	159,805
Sales of Joint Ventures	7,044	7,056
Profit (loss) for the period of JointVentures	(21,392)	(28,043)
Dayone Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.)
Disclosure of joint ventures [line items]
Total assets	452,509	441,875
Total liabilities	504,351	496,355
Sales of Joint Ventures	143,870	93,832
Profit (loss) for the period of JointVentures	409	30,269
OneEnergy Asia Limited
Disclosure of joint ventures [line items]
Total assets	136,247	78,005
Total liabilities	777	150
Sales of Joint Ventures	0	0
Profit (loss) for the period of JointVentures	(2,844)	(578)
KAS Investment I LLC
Disclosure of joint ventures [line items]
Total assets	52,681	78,410
Total liabilities	1,583	0
Sales of Joint Ventures	(19,390)	0
Profit (loss) for the period of JointVentures	(23,007)	0
KAS Investment II LLC
Disclosure of joint ventures [line items]
Total assets	52,476	78,096
Total liabilities	1,581	0
Sales of Joint Ventures	(19,311)	0
Profit (loss) for the period of JointVentures	(21,801)	0
Energyco LLC
Disclosure of joint ventures [line items]
Total assets	59,662	3,425
Total liabilities	57,227	563
Sales of Joint Ventures	168	0
Profit (loss) for the period of JointVentures	(2,514)	(2,856)
CAES, LLC
Disclosure of joint ventures [line items]
Total assets	43,089	40,840
Total liabilities	0	0
Sales of Joint Ventures	0	0
Profit (loss) for the period of JointVentures	(923)	(1,656)
Hapcheon Floating Photovoltaic Power Plant Inc.
Disclosure of joint ventures [line items]
Total assets	73,978	9,708
Total liabilities	59,832	0
Sales of Joint Ventures	1,120	0
Profit (loss) for the period of JointVentures	(972)	0
Busan Industrial Solar Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	19,085	15,283
Total liabilities	17,937	14,499
Sales of Joint Ventures	1,879	19
Profit (loss) for the period of JointVentures	566	(485)
Bitsolar Energy Co., Ltd.,
Disclosure of joint ventures [line items]
Total assets	80,307	144,758
Total liabilities	85,340	149,561
Sales of Joint Ventures	8,298	0
Profit (loss) for the period of JointVentures	(1,105)	₩ (6,116)
Guadalupe Solar SpA
Disclosure of joint ventures [line items]
Total assets	8,774
Total liabilities	7,839
Sales of Joint Ventures	12
Profit (loss) for the period of JointVentures	(1,119)
Omisan Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	128,724
Total liabilities	103,802
Sales of Joint Ventures	0
Profit (loss) for the period of JointVentures	(320)
Foresight Iberian Solar Group Holding, S.L.
Disclosure of joint ventures [line items]
Total assets	90,610
Total liabilities	79,519
Sales of Joint Ventures	168
Profit (loss) for the period of JointVentures	(603)
Yeongwol Eco Wind Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	43,784
Total liabilities	39,066
Sales of Joint Ventures	0
Profit (loss) for the period of JointVentures	421
Gurae Resident Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	6,932
Total liabilities	5,734
Sales of Joint Ventures	0
Profit (loss) for the period of JointVentures	42
Cheongju Eco Park Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	138,657
Total liabilities	120,485
Sales of Joint Ventures	6,454
Profit (loss) for the period of JointVentures	(1,708)
Enel X Midland Photovoltaic, LLC
Disclosure of joint ventures [line items]
Total assets	9,053
Total liabilities	611
Sales of Joint Ventures	122
Profit (loss) for the period of JointVentures	(31)
Geumsungsan Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	66,862
Total liabilities	47,906
Sales of Joint Ventures	0
Profit (loss) for the period of JointVentures	(2,146)
KEPCO KPS Carabao Corp.
Disclosure of joint ventures [line items]
Total assets	3,482
Total liabilities	2,516
Sales of Joint Ventures	5,309
Profit (loss) for the period of JointVentures	733
Prime Swedish Holding AB
Disclosure of joint ventures [line items]
Total assets	34,257
Total liabilities	20
Sales of Joint Ventures	0
Profit (loss) for the period of JointVentures	(5)
Goheung New Energy Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	55,145
Total liabilities	32,125
Sales of Joint Ventures	0
Profit (loss) for the period of JointVentures	(2,711)
Gunsan Land Solar Co., Ltd.
Disclosure of joint ventures [line items]
Total assets	86,654
Total liabilities	60,996
Sales of Joint Ventures	432
Profit (loss) for the period of JointVentures	432
Capman Lynx SCA, SICAR
Disclosure of joint ventures [line items]
Total assets	113,658
Total liabilities	93,706
Sales of Joint Ventures	0
Profit (loss) for the period of JointVentures	0
International Offshore Power Transmission Holding Company Limited
Disclosure of joint ventures [line items]
Total assets	5
Total liabilities	0
Sales of Joint Ventures	0
Profit (loss) for the period of JointVentures	0
Pulau Indah O&M Sdn. Bhd.
Disclosure of joint ventures [line items]
Total assets	0
Total liabilities	0
Sales of Joint Ventures	0
Profit (loss) for the period of JointVentures	₩ 0

Investments in Joint Ventures 4

Investments in Joint Ventures 4 (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021		Dec. 31, 2020	Dec. 31, 2019
Disclosure of joint ventures [line items]
Book value	₩ 2,239,011		₩ 1,919,746	₩ 1,663,029
KEPCO-Uhde Inc.
Disclosure of joint ventures [line items]
Net assets	₩ 114		₩ 197
Effective percentage of ownership	50.85%		50.80%
Share in net assets	₩ 58		₩ 100
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	58		100	134
Shuweihat Asia Power Investment B.V.
Disclosure of joint ventures [line items]
Net assets	₩ 75,652		₩ 27,069
Effective percentage of ownership	49.00%		49.00%
Share in net assets	₩ 37,069		₩ 13,264
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	37,069		13,264	18,318
Shuweihat Asia Operation & Maintenance Company
Disclosure of joint ventures [line items]
Net assets	₩ 2,509		₩ 1,922
Effective percentage of ownership	55.00%		55.00%
Share in net assets	₩ 1,380		₩ 1,057
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	1,380	[1]	1,057	1,408
Waterbury Lake Uranium L.P.
Disclosure of joint ventures [line items]
Net assets	₩ 65,226		₩ 59,808
Effective percentage of ownership	33.10%		33.10%
Share in net assets	₩ 21,590		₩ 19,797
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	21,590		19,797	20,562
ASM-BG Investicii AD
Disclosure of joint ventures [line items]
Net assets	₩ 37,384		₩ 36,400
Effective percentage of ownership	50.00%		50.00%
Share in net assets	₩ 18,692		₩ 18,200
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	18,692		18,200	19,376
RES Technology AD
Disclosure of joint ventures [line items]
Net assets	₩ 33,405		₩ 31,860
Effective percentage of ownership	50.00%		50.00%
Share in net assets	₩ 16,703		₩ 15,930
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	16,703		15,930	16,248
KV Holdings, Inc.
Disclosure of joint ventures [line items]
Net assets	₩ 6,317		₩ 6,013
Effective percentage of ownership	40.00%		40.00%
Share in net assets	₩ 2,527		₩ 2,405
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	2,527		2,405	2,441
KEPCO SPC Power Corporation
Disclosure of joint ventures [line items]
Net assets	₩ 264,600		₩ 268,169
Effective percentage of ownership	75.20%		75.20%
Share in net assets	₩ 198,979		₩ 201,663
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	198,979	[1]	201,663	214,794
Gansu Datang Yumen Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 16,588		₩ 16,325
Effective percentage of ownership	40.00%		40.00%
Share in net assets	₩ 6,635		₩ 6,530
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	6,635		6,530	8,149
Datang Chifeng Renewable Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 511,467		₩ 471,194
Effective percentage of ownership	40.00%		40.00%
Share in net assets	₩ 204,587		₩ 188,478
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	204,587		188,478	185,307
Datang KEPCO Chaoyang Renewable Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 110,542		₩ 106,324
Effective percentage of ownership	40.00%		40.00%
Share in net assets	₩ 44,217		₩ 42,530
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	44,217		42,530	41,024
Rabigh Electricity Company
Disclosure of joint ventures [line items]
Net assets	₩ 500,132		₩ 396,179
Effective percentage of ownership	40.00%		40.00%
Share in net assets	₩ 200,053		₩ 158,472
Investment differential	0		0
Intercompany transaction	(55,571)		(60,511)
Others (consolidated FS)	(804)		(804)
Book value	143,678		97,157	109,096
Rabigh Operation & Maintenance Company Limited
Disclosure of joint ventures [line items]
Net assets	₩ 10,177		₩ 9,533
Effective percentage of ownership	40.00%		40.00%
Share in net assets	₩ 4,071		₩ 3,813
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	4,071		3,813	6,879
Jamaica Public Service Company Limited
Disclosure of joint ventures [line items]
Net assets	₩ 705,503		₩ 636,994
Effective percentage of ownership	40.00%		40.00%
Share in net assets	₩ 282,201		₩ 254,798
Investment differential	29,357		29,357
Intercompany transaction	0		0
Others (consolidated FS)	(16,909)		(17,934)
Book value	294,649		266,221	253,607
KW Nuclear Components Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 35,355		₩ 25,217
Effective percentage of ownership	45.00%		45.00%
Share in net assets	₩ 15,910		₩ 11,348
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	(176)		(177)
Book value	15,734		11,171	9,052
Busan Shinho Solar Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 23,363		₩ 21,512
Effective percentage of ownership	25.00%		25.00%
Share in net assets	₩ 5,841		₩ 5,378
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	5,841		5,378	5,045
Global Trade Of Power System Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 2,058		₩ 1,884
Effective percentage of ownership	29.00%		29.00%
Share in net assets	₩ 597		₩ 546
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	597		546	571
Expressway Solar-light Power Generation Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 10,634		₩ 9,985
Effective percentage of ownership	29.00%		29.00%
Share in net assets	₩ 3,084		₩ 2,896
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	3,084		2,896	2,883
Amman Asia Electric Power Company
Disclosure of joint ventures [line items]
Net assets	₩ 297,799		₩ 268,755
Effective percentage of ownership	60.00%		60.00%
Share in net assets	₩ 178,679		₩ 161,253
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	178,679		161,253	192,164
KAPES, Inc.
Disclosure of joint ventures [line items]
Net assets	₩ 33,691		₩ 32,096
Effective percentage of ownership	51.00%		51.00%
Share in net assets	₩ 17,182		₩ 16,369
Investment differential	0		0
Intercompany transaction	(20,697)		(19,567)
Others (consolidated FS)	3,515		3,198
Book value	0		0	10,832
Honam Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 13,823		₩ 13,292
Effective percentage of ownership	29.00%		29.00%
Share in net assets	₩ 4,009		₩ 3,855
Investment differential	32		32
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	4,041		3,887	4,375
Jeongam Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets			₩ 11,550
Effective percentage of ownership			40.00%
Share in net assets			₩ 4,620
Investment differential			0
Intercompany transaction			0
Others (consolidated FS)			0
Book value	0		4,620	4,437
Korea Power Engineering Service Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 18,671		₩ 18,488
Effective percentage of ownership	29.00%		29.00%
Share in net assets	₩ 5,415		₩ 5,362
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	5,415		5,362	4,902
Chun-cheon Energy Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 87,427		₩ 92,851
Effective percentage of ownership	29.90%		29.90%
Share in net assets	₩ 26,141		₩ 27,762
Investment differential	3		3
Intercompany transaction	0		0
Others (consolidated FS)	(248)		(247)
Book value	25,896		27,518	34,872
Yeonggwangbaeksu Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 18,149		₩ 20,791
Effective percentage of ownership	15.00%		15.00%
Share in net assets	₩ 2,722		₩ 3,119
Investment differential	6		5
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	2,728		3,124	3,040
Nghi Son 2 Power LLC
Disclosure of joint ventures [line items]
Net assets	₩ (37,879)		₩ (266,560)
Effective percentage of ownership	50.00%		50.00%
Share in net assets	₩ (18,940)		₩ (133,280)
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	18,940		133,280
Book value	0		0	0
Kelar S.A
Disclosure of joint ventures [line items]
Net assets	₩ 129,173		₩ 106,063
Effective percentage of ownership	65.00%		65.00%
Share in net assets	₩ 83,962		₩ 68,941
Investment differential	2,733		2,508
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	86,695		71,449	70,462
PT. Tanjung Power Indonesia
Disclosure of joint ventures [line items]
Net assets	₩ 132,988		₩ 94,465
Effective percentage of ownership	35.00%		35.00%
Share in net assets	₩ 46,546		₩ 33,063
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	46,546		33,063	34,327
Incheon New Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 634		₩ 525
Effective percentage of ownership	29.00%		29.00%
Share in net assets	₩ 184		₩ 152
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	(184)		(152)
Book value	0		0	0
Seokmun Energy Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 47,732		₩ 51,082
Effective percentage of ownership	29.00%		29.00%
Share in net assets	₩ 13,842		₩ 14,814
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	13,842		14,814	17,342
Daehan Wind Power PSC
Disclosure of joint ventures [line items]
Net assets	₩ 10,308		₩ (7,710)
Effective percentage of ownership	50.00%		50.00%
Share in net assets	₩ 5,154		₩ (3,855)
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		3,855
Book value	5,154		0	1,757
Barakah One Company
Disclosure of joint ventures [line items]
Net assets	₩ (243,855)		₩ (230,516)
Effective percentage of ownership	18.00%		18.00%
Share in net assets	₩ (43,894)		₩ (41,493)
Investment differential	0		0
Intercompany transaction	1,058		(27,845)
Others (consolidated FS)	42,836		69,338
Book value	0		0	0
Nawah Energy Company
Disclosure of joint ventures [line items]
Net assets	₩ 1,632		₩ 1,498
Effective percentage of ownership	18.00%		18.00%
Share in net assets	₩ 294		₩ 270
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	294		270	285
Momentum
Disclosure of joint ventures [line items]
Net assets	₩ 1,104		₩ 1,696
Effective percentage of ownership	33.33%		33.33%
Share in net assets	₩ 368		₩ 565
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	368		565	553
Daegu Green Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 81,768		₩ 79,908
Effective percentage of ownership	54.24%		54.24%
Share in net assets	₩ 44,351		₩ 43,342
Investment differential	84		84
Intercompany transaction	0		0
Others (consolidated FS)	(20,381)		(20,381)
Book value	24,054		23,045	22,824
Yeonggwang Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 37,291		₩ 36,443
Effective percentage of ownership	46.00%		46.00%
Share in net assets	₩ 17,154		₩ 16,764
Investment differential	492		492
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	17,646		17,256	17,627
Chester Solar IV SpA
Disclosure of joint ventures [line items]
Net assets	₩ (178)		₩ 2,242
Effective percentage of ownership	45.00%		45.00%
Share in net assets	₩ (80)		₩ 1,009
Investment differential	60		55
Intercompany transaction	0		0
Others (consolidated FS)	20		0
Book value	0		1,064	672
Chester Solar V SpA
Disclosure of joint ventures [line items]
Net assets	₩ (222)		₩ 361
Effective percentage of ownership	45.00%		45.00%
Share in net assets	₩ (100)		₩ 162
Investment differential	125		115
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	25		277	146
Diego de Almagro Solar SpA
Disclosure of joint ventures [line items]
Net assets	₩ 583		₩ 3,108
Effective percentage of ownership	45.00%		45.00%
Share in net assets	₩ 262		₩ 1,399
Investment differential	100		91
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	362		1,490	1,035
South Jamaica Power Company Limited
Disclosure of joint ventures [line items]
Net assets	₩ 186,812		₩ 159,494
Effective percentage of ownership	20.00%		20.00%
Share in net assets	₩ 37,362		₩ 31,899
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	(2)		(2)
Book value	37,360		31,897	13,863
Daesan Green Energy Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 60,697		₩ 64,435
Effective percentage of ownership	35.00%		35.00%
Share in net assets	₩ 21,244		₩ 22,552
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	21,244		22,552	17,182
RE Holiday Holdings LLC
Disclosure of joint ventures [line items]
Net assets	₩ 146,334		₩ 137,618
Effective percentage of ownership	50.00%		50.00%
Share in net assets	₩ 73,167		₩ 68,809
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	73,167		68,809	42,070
RE Pioneer Holdings LLC
Disclosure of joint ventures [line items]
Net assets	₩ 94,029		₩ 99,278
Effective percentage of ownership	50.00%		50.00%
Share in net assets	₩ 47,015		₩ 49,639
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	47,015		49,639	31,156
RE Barren Ridge 1 Holdings LLC
Disclosure of joint ventures [line items]
Net assets	₩ 114,338		₩ 107,472
Effective percentage of ownership	50.00%		50.00%
Share in net assets	₩ 57,169		₩ 53,736
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	(55,286)		(49,270)
Book value	1,883		4,466	42,916
RE Astoria 2 LandCo LLC
Disclosure of joint ventures [line items]
Net assets	₩ 11,996		₩ 10,459
Effective percentage of ownership	50.00%		50.00%
Share in net assets	₩ 5,998		₩ 5,230
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	5,998		5,230	5,602
RE Barren Ridge LandCo LLC
Disclosure of joint ventures [line items]
Net assets	₩ 4,239		₩ 3,694
Effective percentage of ownership	50.00%		50.00%
Share in net assets	₩ 2,120		₩ 1,847
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	2,120		1,847	1,966
Laurel SpA
Disclosure of joint ventures [line items]
Net assets	₩ 216		₩ 2,033
Effective percentage of ownership	45.00%		45.00%
Share in net assets	₩ 97		₩ 915
Investment differential	193		177
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	290		1,092	595
KIAMCO KOWEPO Bannerton Hold Co Pty Ltd
Disclosure of joint ventures [line items]
Net assets	₩ 29,236		₩ 33,312
Effective percentage of ownership	12.37%		12.37%
Share in net assets	₩ 3,616		₩ 4,121
Investment differential	9		8
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	3,625		4,129	4,024
Chile Solar JV SpA
Disclosure of joint ventures [line items]
Net assets	₩ 64,914		₩ 69,765
Effective percentage of ownership	50.00%		50.00%
Share in net assets	₩ 32,457		₩ 34,883
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	32,457		34,883	34,859
Taebaek Gadeoksan Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets			₩ 28,244
Effective percentage of ownership			47.31%
Share in net assets			₩ 13,362
Investment differential			0
Intercompany transaction			0
Others (consolidated FS)			0
Book value	0		13,362	7,846
Cheong-Song Noraesan Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 13,941		₩ 11,689
Effective percentage of ownership	29.01%		29.01%
Share in net assets	₩ 4,045		₩ 3,391
Investment differential	61		61
Intercompany transaction	0		0
Others (consolidated FS)	0		1
Book value	4,106		3,453	3,043
Chester Solar I SpA
Disclosure of joint ventures [line items]
Net assets	₩ 1,922		₩ 3,082
Effective percentage of ownership	45.00%		45.00%
Share in net assets	₩ 865		₩ 1,387
Investment differential	255		234
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	1,120		1,621	1,157
Solar Philippines Calatagan Corporation
Disclosure of joint ventures [line items]
Net assets	₩ 70,565		₩ 50,849
Effective percentage of ownership	38.00%		38.00%
Share in net assets	₩ 26,815		₩ 19,323
Investment differential	0		29,694
Intercompany transaction	0		0
Others (consolidated FS)	31,416		0
Book value	58,231		49,017	48,930
Saemangeum Solar Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 29,552		₩ 30,183
Effective percentage of ownership	81.01%		81.00%
Share in net assets	₩ 23,939		₩ 24,450
Investment differential	0		(158)
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	23,939		24,292	8,324
Chungsongmeon BongSan wind power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 6,987		₩ 8,077
Effective percentage of ownership	29.00%		29.00%
Share in net assets	₩ 2,026		₩ 2,342
Investment differential	1,782		1,782
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	3,808		4,124	2,764
Jaeun Resident Wind Power Plant Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 6,753		₩ 7,569
Effective percentage of ownership	29.00%		29.00%
Share in net assets	₩ 1,958		₩ 2,195
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	1,958		2,195	2,198
DE Energia SpA
Disclosure of joint ventures [line items]
Net assets	₩ (10,386)		₩ (6,607)
Effective percentage of ownership	49.00%		49.00%
Share in net assets	₩ (5,089)		₩ (3,237)
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	14,010		11,424
Book value	8,921		8,187	8,665
Dangjin Eco Power Co., Ltd. (newly)
Disclosure of joint ventures [line items]
Net assets	₩ 75,787		₩ 74,065
Effective percentage of ownership	34.00%		34.00%
Share in net assets	₩ 25,768		₩ 25,182
Investment differential	341		341
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	26,109		25,523	25,661
Haemodum Solar Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 6,288		₩ 6,255
Effective percentage of ownership	49.00%		49.00%
Share in net assets	₩ 3,081		₩ 3,065
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	3,081		3,065	2,940
Yangyang Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 22,295		₩ 20,884
Effective percentage of ownership	50.00%		50.00%
Share in net assets	₩ 11,148		₩ 10,442
Investment differential	43		43
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	11,191		10,485	10,800
Horus Solar, S.A. De C.V.
Disclosure of joint ventures [line items]
Net assets	₩ 15,136		₩ (1,242)
Effective percentage of ownership	14.95%		14.95%
Share in net assets	₩ 2,262		₩ (186)
Investment differential	3,580		3,580
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	5,842		3,394	3,403
Recursos Solares PV De Mexico II, S.A. De C.V.
Disclosure of joint ventures [line items]
Net assets	₩ 15,822		₩ 9,962
Effective percentage of ownership	14.95%		14.95%
Share in net assets	₩ 2,365		₩ 1,489
Investment differential	2,171		2,171
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	4,536		3,660	672
Sunmex Renovables, S.A. De C.V.
Disclosure of joint ventures [line items]
Net assets	₩ 10,738		₩ 1,577
Effective percentage of ownership	14.95%		14.95%
Share in net assets	₩ 1,605		₩ 236
Investment differential	5		4
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	1,610		240	222
Stavro Holding II AB
Disclosure of joint ventures [line items]
Net assets	₩ 88,133		₩ 46,385
Effective percentage of ownership	20.00%		20.00%
Share in net assets	₩ 17,627		₩ 9,277
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	17,627		9,277	5,625
Solaseado Solar Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 21,928		₩ 21,990
Effective percentage of ownership	38.90%		38.90%
Share in net assets	₩ 8,530		₩ 8,554
Investment differential	1,361		1,361
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	9,891		9,915	0
Yeongam Solar Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 31,919		₩ 27,729
Effective percentage of ownership	19.00%		19.00%
Share in net assets	₩ 6,065		₩ 5,269
Investment differential	773		773
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	6,838		6,042	0
Samsu Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 14,882		₩ 13,720
Effective percentage of ownership	19.00%		19.00%
Share in net assets	₩ 2,828		₩ 2,607
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	2,828		2,607	0
Pulau Indah Power Plant Sdn. Bhd.
Disclosure of joint ventures [line items]
Net assets	₩ 65,823		₩ 22,245
Effective percentage of ownership	25.00%		25.00%
Share in net assets	₩ 16,456		₩ 5,561
Investment differential	5,643		5,643
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	22,099		11,204	0
Sam-Yang Photovoltaic Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 10,190		₩ 11,296
Effective percentage of ownership	49.00%		49.00%
Share in net assets	₩ 4,993		₩ 5,535
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	4,993		5,535	0
NH-Amundi Global Infrastructure Investment Private Investment Trust 21
Disclosure of joint ventures [line items]
Net assets	₩ 70,872		₩ 73,534
Effective percentage of ownership	29.53%		29.53%
Share in net assets	₩ 20,929		₩ 21,715
Investment differential	527		0
Intercompany transaction	0		0
Others (consolidated FS)	0		527
Book value	21,456		22,242	0
Shin-han BNPP Private Investment Trust for East-West Sunlight Dream
Disclosure of joint ventures [line items]
Net assets	₩ 18,098		₩ 17,921
Effective percentage of ownership	90.00%		90.00%
Share in net assets	₩ 16,288		₩ 16,129
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	16,288		16,129	0
PT Barito Wahana Tenaga
Disclosure of joint ventures [line items]
Net assets	₩ 266,545		₩ 205,894
Effective percentage of ownership	30.61%		30.61%
Share in net assets	₩ 81,595		₩ 63,029
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	81,595		63,029	0
Cheongna Energy Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 18,485		₩ 5,742
Effective percentage of ownership	50.10%		50.10%
Share in net assets	₩ 9,261		₩ 2,877
Investment differential	3,137		3,137
Intercompany transaction	(1,200)		(1,074)
Others (consolidated FS)	0		0
Book value	11,198		4,940	0
Naepo Green Energy Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ (26,530)		₩ (7,802)
Effective percentage of ownership	29.20%		29.20%
Share in net assets	₩ (7,747)		₩ (2,278)
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	7,747		2,278
Book value	0		0	0
Dayone Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.)
Disclosure of joint ventures [line items]
Net assets	₩ (51,842)		₩ (54,480)
Effective percentage of ownership	46.30%		46.30%
Share in net assets	₩ (24,003)		₩ (25,224)
Investment differential	0		0
Intercompany transaction	(882)		(923)
Others (consolidated FS)	24,885		26,147
Book value	0		0	0
OneEnergy Asia Limited
Disclosure of joint ventures [line items]
Net assets	₩ 135,470		₩ 77,855
Effective percentage of ownership	40.00%		40.00%
Share in net assets	₩ 54,188		₩ 31,142
Investment differential	25,512		25,512
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	79,700		56,654	0
KAS Investment I LLC
Disclosure of joint ventures [line items]
Net assets	₩ 51,098		₩ 78,410
Effective percentage of ownership	29.89%		29.89%
Share in net assets	₩ 15,273		₩ 23,437
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	15,273		23,437	0
KAS Investment II LLC
Disclosure of joint ventures [line items]
Net assets	₩ 50,895		₩ 78,096
Effective percentage of ownership	29.89%		29.89%
Share in net assets	₩ 15,213		₩ 23,343
Investment differential	0		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	15,213		23,343	0
Energyco LLC
Disclosure of joint ventures [line items]
Net assets			₩ 2,862
Effective percentage of ownership			29.00%
Share in net assets			₩ 830
Investment differential			829
Intercompany transaction			0
Others (consolidated FS)			0
Book value	1,535		1,659	0
CAES, LLC
Disclosure of joint ventures [line items]
Net assets	₩ 43,089		₩ 40,840
Effective percentage of ownership	36.00%		36.00%
Share in net assets	₩ 15,512		₩ 14,702
Investment differential	2,923		2,924
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	18,435		17,626	0
Hapcheon Floating Photovoltaic Power Plant Inc.
Disclosure of joint ventures [line items]
Net assets	₩ 14,146		₩ 9,708
Effective percentage of ownership	49.00%		19.47%
Share in net assets	₩ 6,932		₩ 1,890
Investment differential	39		0
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	6,971		1,890	0
Busan Industrial Solar Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 1,148		₩ 784
Effective percentage of ownership	28.02%		28.02%
Share in net assets	₩ 322		₩ 220
Investment differential	290		290
Intercompany transaction	0		0
Others (consolidated FS)	0		0
Book value	612		510	0
Bitsolar Energy Co., Ltd.,
Disclosure of joint ventures [line items]
Net assets	₩ (5,033)		₩ (4,803)
Effective percentage of ownership	27.10%		27.10%
Share in net assets	₩ (1,364)		₩ (1,302)
Investment differential	352		1,654
Intercompany transaction	0		0
Others (consolidated FS)	1,364		0
Book value	352		352	₩ 0
Energyco Co., Ltd. (formerly, Energyco LLC)
Disclosure of joint ventures [line items]
Net assets	₩ 2,435
Effective percentage of ownership	29.00%
Share in net assets	₩ 706
Investment differential	829
Intercompany transaction	0
Others (consolidated FS)	0
Book value	1,535
Pulau Indah O&M Sdn. Bhd.
Disclosure of joint ventures [line items]
Net assets	₩ 0
Effective percentage of ownership	60.00%
Share in net assets	₩ 0
Investment differential	0
Intercompany transaction	0
Others (consolidated FS)	0
Book value	0		0
Guadalupe Solar SpA
Disclosure of joint ventures [line items]
Net assets	₩ 935
Effective percentage of ownership	60.00%
Share in net assets	₩ 561
Investment differential	98
Intercompany transaction	0
Others (consolidated FS)	0
Book value	659		0
Omisan Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 24,922
Effective percentage of ownership	42.00%
Share in net assets	₩ 10,467
Investment differential	166
Intercompany transaction	0
Others (consolidated FS)	0
Book value	10,633		0
Foresight Iberian Solar Group Holding, S.L.
Disclosure of joint ventures [line items]
Net assets	₩ 11,091
Effective percentage of ownership	75.00%
Share in net assets	₩ 8,318
Investment differential	1,425
Intercompany transaction	0
Others (consolidated FS)	0
Book value	9,743		0
Yeongwol Eco Wind Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 4,718
Effective percentage of ownership	29.00%
Share in net assets	₩ 1,368
Investment differential	1,828
Intercompany transaction	0
Others (consolidated FS)	0
Book value	3,196		0
Gurae Resident Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 1,198
Effective percentage of ownership	29.00%
Share in net assets	₩ 347
Investment differential	48
Intercompany transaction	0
Others (consolidated FS)	0
Book value	395		0
Cheongju Eco Park Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 18,172
Effective percentage of ownership	29.00%
Share in net assets	₩ 5,270
Investment differential	195
Intercompany transaction	0
Others (consolidated FS)	0
Book value	5,465		0
Enel X Midland Photovoltaic, LLC
Disclosure of joint ventures [line items]
Net assets	₩ 8,442
Effective percentage of ownership	20.00%
Share in net assets	₩ 1,688
Investment differential	0
Intercompany transaction	0
Others (consolidated FS)	0
Book value	1,688		0
Geumsungsan Wind Power Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 18,956
Effective percentage of ownership	29.00%
Share in net assets	₩ 5,497
Investment differential	556
Intercompany transaction	0
Others (consolidated FS)	0
Book value	6,053		0
KEPCO KPS Carabao Corp.
Disclosure of joint ventures [line items]
Net assets	₩ 966
Effective percentage of ownership	40.00%
Share in net assets	₩ 386
Investment differential	0
Intercompany transaction	0
Others (consolidated FS)	0
Book value	386		0
Prime Swedish Holding AB
Disclosure of joint ventures [line items]
Net assets	₩ 34,237
Effective percentage of ownership	45.00%
Share in net assets	₩ 15,407
Investment differential	34
Intercompany transaction	0
Others (consolidated FS)	0
Book value	15,441		0
Goheung New Energy Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 23,020
Effective percentage of ownership	46.15%
Share in net assets	₩ 10,624
Investment differential	1,084
Intercompany transaction	0
Others (consolidated FS)	0
Book value	11,708		0
Gunsan Land Solar Co., Ltd.
Disclosure of joint ventures [line items]
Net assets	₩ 25,658
Effective percentage of ownership	75.29%
Share in net assets	₩ 19,317
Investment differential	0
Intercompany transaction	0
Others (consolidated FS)	0
Book value	19,317		0
Capman Lynx SCA, SICAR
Disclosure of joint ventures [line items]
Net assets	₩ 19,952
Effective percentage of ownership	50.00%
Share in net assets	₩ 9,976
Investment differential	0
Intercompany transaction	0
Others (consolidated FS)	0
Book value	9,976		0
International Offshore Power Transmission Holding Company Limited
Disclosure of joint ventures [line items]
Net assets	₩ 5
Effective percentage of ownership	35.00%
Share in net assets	₩ 2
Investment differential	(2)
Intercompany transaction	0
Others (consolidated FS)	0
Book value	₩ 0		₩ 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.

Investments in Joint Ventures (

Investments in Joint Ventures (Parenthetical) (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disclosure of joint ventures [line items]
Acquisition cost	₩ 2,069,491	₩ 1,943,392
Korea Gas Corporation
Disclosure of joint ventures [line items]
Effective percentage of ownership	20.47%	22.02%
Acquisition cost	₩ 1,815,513	₩ 1,647,325
Korea Power Exchange [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership	100.00%	100.00%
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	50.00%	50.00%
Daegu Green Power Joint Ventures [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership	54.24%
Nominal percentage of ownership associate	29.00%	29.00%
Saemangeum Solar Power Co., Ltd [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership	50.00%
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] | Gangwon Wind Power Co., Ltd. [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership	20.00%	20.00%
Bottom of range [member] | KNOC Nigerian East Oil [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership	20.00%	20.00%
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] | Namjeongsusang Solar Power Operation Co., Ltd. [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership	20.00%	20.00%
Bottom of range [member] | Go Deok Clean Energy Co., Ltd. [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership		50.00%
Bottom of range [member] | Jeju SolarOne Co., Ltd.( [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership		20.00%
Bottom of range [member] | SUNMEX RENOVABLES, S.A. DE C.V. [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership	20.00%
Bottom of range [member] | Seoroseoro Sunny Power Plant Co Ltd [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership		20.00%
Bottom of range [member] | Barakah One Company [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership	20.00%
Bottom of range [member] | Horus Solar S.A. De C.V. [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership		20.00%
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	50.00%	50.00%
Top of range [member] | Go Deok Clean Energy Co., Ltd. [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership		50.00%
Top of range [member] | Shuweihat Asia Operation & Maintenance Company [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership	50.00%	50.00%
Top of range [member] | Saemangeum Solar Power Co., Ltd [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership	50.00%	50.00%
Top of range [member] | Nepal Water Energy Development Company Private Limited [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership	50.00%	50.00%
Top of range [member] | Barakah One Company [Member]
Disclosure of joint ventures [line items]
Effective percentage of ownership		20.00%

Investments in Associates and_3

Investments in Associates and Joint Ventures - Additional Information (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
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	4.90%	4.60%
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	8.00%
Operating fees percentage	1.00%
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, 2021	Dec. 31, 2020
Changes in property and equipment [Line Items]
Beginning balance	₩ 168,709,387	₩ 164,701,827
Acquisitions	12,614,177	13,593,937
Disposals	(613,515)	(685,326)
Depreciation	(11,770,725)	(11,376,100)
Impairment	(4,056)	(72,607)
Others	4,184,513	2,547,656
Ending balance	173,119,781	168,709,387
Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	272,874,770
Ending balance	287,613,240	272,874,770
Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(102,800,055)
Ending balance	(113,125,144)	(102,800,055)
Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(866,604)
Ending balance	(866,906)	(866,604)
Government grants
Changes in property and equipment [Line Items]
Beginning balance	(498,724)
Ending balance	(501,409)	(498,724)
Land
Changes in property and equipment [Line Items]
Beginning balance	13,919,851
Ending balance	14,084,491	13,919,851
Land | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	13,943,326	13,848,063
Acquisitions	9,561	5,330
Disposals	(54,447)	(31,304)
Depreciation	0	(273)
Impairment	0	0
Others	209,525	121,510
Ending balance	14,107,965	13,943,326
Land | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	13,970,098
Ending balance	14,135,452	13,970,098
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	(26,772)
Ending balance	(27,487)	(26,772)
Land | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(23,475)	(21,817)
Acquisitions	0	0
Disposals	1	2
Depreciation	0	0
Impairment	0	0
Others	0	(1,660)
Ending balance	(23,474)	(23,475)
Buildings
Changes in property and equipment [Line Items]
Beginning balance	12,559,301
Ending balance	12,872,930	12,559,301
Buildings | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	12,616,532	12,445,706
Acquisitions	9,036	7,225
Disposals	(19,974)	(16,015)
Depreciation	(889,539)	(875,680)
Impairment	0	(2,107)
Others	1,208,997	1,057,403
Ending balance	12,925,052	12,616,532
Buildings | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	21,773,824
Ending balance	22,973,395	21,773,824
Buildings | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(9,150,218)
Ending balance	(10,041,270)	(9,150,218)
Buildings | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(7,074)
Ending balance	(7,073)	(7,074)
Buildings | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(57,231)	(61,920)
Acquisitions	0	0
Disposals	0	0
Depreciation	5,174	5,206
Impairment	0	0
Others	(65)	(517)
Ending balance	(52,122)	(57,231)
Structures
Changes in property and equipment [Line Items]
Beginning balance	46,078,846
Ending balance	48,116,505	46,078,846
Structures | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	46,258,855	45,178,870
Acquisitions	(5,472)	36,091
Disposals	(319,287)	(346,612)
Depreciation	(2,582,488)	(2,313,920)
Impairment	(741)	(3,571)
Others	4,937,659	3,707,997
Ending balance	48,288,526	46,258,855
Structures | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	74,136,523
Ending balance	78,473,094	74,136,523
Structures | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(27,864,461)
Ending balance	(30,171,363)	(27,864,461)
Structures | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(13,207)
Ending balance	(13,205)	(13,207)
Structures | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(180,009)	(186,554)
Acquisitions	0	0
Disposals	1,811	2,032
Depreciation	9,517	9,526
Impairment	0	0
Others	(3,340)	(5,013)
Ending balance	(172,021)	(180,009)
Machinery
Changes in property and equipment [Line Items]
Beginning balance	49,881,002
Ending balance	51,603,143	49,881,002
Machinery | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	50,038,787	49,907,300
Acquisitions	268,126	407,521
Disposals	(135,803)	(283,845)
Depreciation	(5,759,155)	(5,526,816)
Impairment	0	(74,362)
Others	7,331,270	5,608,989
Ending balance	51,743,225	50,038,787
Machinery | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	94,295,027
Ending balance	101,049,793	94,295,027
Machinery | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(43,740,838)
Ending balance	(48,791,577)	(43,740,838)
Machinery | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(515,402)
Ending balance	(514,991)	(515,402)
Machinery | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(157,785)	(158,907)
Acquisitions	0	0
Disposals	531	496
Depreciation	17,519	17,468
Impairment	0	0
Others	(347)	(16,842)
Ending balance	(140,082)	(157,785)
Ships
Changes in property and equipment [Line Items]
Beginning balance	255
Ending balance	177	255
Ships | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	255	201
Acquisitions	0	0
Disposals	0	0
Depreciation	(103)	(106)
Impairment	0	0
Others	25	160
Ending balance	177	255
Ships | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	2,482
Ending balance	2,068	2,482
Ships | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(2,227)
Ending balance	(1,891)	(2,227)
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	78,351
Ending balance	87,582	78,351
Vehicles | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	78,983	70,585
Acquisitions	4,807	3,880
Disposals	(4,298)	(151)
Depreciation	(37,980)	(35,036)
Impairment	0	0
Others	47,745	39,705
Ending balance	89,257	78,983
Vehicles | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	338,386
Ending balance	371,207	338,386
Vehicles | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(259,288)
Ending balance	(281,833)	(259,288)
Vehicles | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(115)
Ending balance	(117)	(115)
Vehicles | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(632)	(2,275)
Acquisitions	(26)	0
Disposals	0	4
Depreciation	460	2,064
Impairment	0	0
Others	(1,477)	(425)
Ending balance	(1,675)	(632)
Equipment
Changes in property and equipment [Line Items]
Beginning balance	407,616
Ending balance	397,034	407,616
Equipment | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	407,843	374,115
Acquisitions	54,875	72,655
Disposals	(667)	(86)
Depreciation	(184,007)	(186,004)
Impairment	0	0
Others	119,139	147,163
Ending balance	397,183	407,843
Equipment | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	1,895,528
Ending balance	1,989,115	1,895,528
Equipment | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(1,487,643)
Ending balance	(1,591,890)	(1,487,643)
Equipment | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(42)
Ending balance	(42)	(42)
Equipment | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(227)	(241)
Acquisitions	0	0
Disposals	0	0
Depreciation	95	149
Impairment	0	0
Others	(17)	(135)
Ending balance	(149)	(227)
Tools
Changes in property and equipment [Line Items]
Beginning balance	192,148
Ending balance	183,001	192,148
Tools | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	192,387	164,064
Acquisitions	19,389	28,048
Disposals	(89)	(193)
Depreciation	(81,984)	(82,862)
Impairment	0	0
Others	53,362	83,330
Ending balance	183,065	192,387
Tools | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	1,195,721
Ending balance	1,256,189	1,195,721
Tools | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(1,003,295)
Ending balance	(1,073,086)	(1,003,295)
Tools | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(39)
Ending balance	(38)	(39)
Tools | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(239)	(403)
Acquisitions	0	0
Disposals	0	0
Depreciation	209	243
Impairment	0	0
Others	(34)	(79)
Ending balance	(64)	(239)
Construction in progress
Changes in property and equipment [Line Items]
Beginning balance	30,884,599
Ending balance	30,044,272	30,884,599
Construction in progress | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	30,963,725	28,419,470
Acquisitions	12,165,238	12,726,469
Disposals	(66,965)	(486)
Depreciation	0	0
Impairment	(3,315)	7,799
Others	(12,902,589)	(10,189,527)
Ending balance	30,156,094	30,963,725
Construction in progress | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	31,121,255
Ending balance	30,313,624	31,121,255
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	(157,530)	(157,530)
Construction in progress | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(79,126)	(61,211)
Acquisitions	5,027	8,783
Disposals	0	0
Depreciation	0	0
Impairment	0	0
Others	(37,723)	(26,698)
Ending balance	(111,822)	(79,126)
Right-of-use assets
Changes in property and equipment [Line Items]
Beginning balance	4,542,166
Ending balance	4,059,397	4,542,166
Right-of-use assets | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	4,542,166	4,783,573
Acquisitions	78,213	291,334
Disposals	(11,787)	(827)
Depreciation	(554,615)	(586,254)
Impairment	0	0
Others	5,420	54,340
Ending balance	4,059,397	4,542,166
Right-of-use assets | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	7,905,214
Ending balance	7,848,138	7,905,214
Right-of-use assets | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(3,363,048)
Ending balance	(3,788,741)	(3,363,048)
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	7,413,171
Ending balance	8,925,388	7,413,171
Retirements, property, plant and equipment | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	7,413,171	7,374,527
Acquisitions	92	131
Disposals	(209)	(196)
Depreciation	(844,518)	(819,708)
Impairment	0	0
Others	2,356,852	858,417
Ending balance	8,925,388	7,413,171
Retirements, property, plant and equipment | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	12,260,732
Ending balance	14,348,920	12,260,732
Retirements, property, plant and equipment | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(4,701,138)
Ending balance	(5,277,109)	(4,701,138)
Retirements, property, plant and equipment | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(146,423)
Ending balance	(146,423)	(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	2,752,081
Ending balance	2,745,861	2,752,081
Other property, plant and equipment | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	2,752,081	2,628,681
Acquisitions	5,311	6,470
Disposals	(2,332)	(8,145)
Depreciation	(869,310)	(984,097)
Impairment	0	(366)
Others	860,111	1,109,538
Ending balance	2,745,861	2,752,081
Other property, plant and equipment | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	13,979,980
Ending balance	14,852,245	13,979,980
Other property, plant and equipment | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(11,227,899)
Ending balance	(12,106,384)	(11,227,899)
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

Investment Properties - Summary

Investment Properties - Summary of Investment Properties and Changes in Investment Properties (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disclosure of detailed information about investment property [line items]
Beginning balance	₩ 225,195	₩ 158,580
Depreciation	(1,386)	(1,453)
Others	(11,025)	68,068
Endings balance	212,784	225,195
Acquisition cost
Disclosure of detailed information about investment property [line items]
Beginning balance	259,738
Endings balance	221,148	259,738
Accumulated depreciation
Disclosure of detailed information about investment property [line items]
Beginning balance	(34,514)
Endings balance	(8,334)	(34,514)
Government grants
Disclosure of detailed information about investment property [line items]
Beginning balance	(29)	(13)
Depreciation	1	1
Others	(2)	(17)
Endings balance	(30)	(29)
Investment property - Land
Disclosure of detailed information about investment property [line items]
Beginning balance	200,391
Endings balance	201,605	200,391
Investment property - Land | Carrying Amount Other than Government Grants
Disclosure of detailed information about investment property [line items]
Beginning balance	200,391	129,897
Depreciation	0	0
Others	1,214	70,494
Endings balance	201,605	200,391
Investment property - Land | Acquisition cost
Disclosure of detailed information about investment property [line items]
Beginning balance	200,391
Endings balance	201,605	200,391
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	24,804
Endings balance	11,179	24,804
Investment property - Buildings | Carrying Amount Other than Government Grants
Disclosure of detailed information about investment property [line items]
Beginning balance	24,833	28,696
Depreciation	(1,387)	(1,454)
Others	(12,237)	(2,409)
Endings balance	11,209	24,833
Investment property - Buildings | Acquisition cost
Disclosure of detailed information about investment property [line items]
Beginning balance	59,347
Endings balance	19,543	59,347
Investment property - Buildings | Accumulated depreciation
Disclosure of detailed information about investment property [line items]
Beginning balance	(34,514)
Endings balance	(8,334)	(34,514)
Investment property - Buildings | Government grants
Disclosure of detailed information about investment property [line items]
Beginning balance	(29)
Endings balance	₩ (30)	₩ (29)

Investment Properties - Summa_2

Investment Properties - Summary of Income and Expenses Related to Investment Properties (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Rental income from investment property, net of direct operating expense [abstract]
Rental income	₩ 10,118	₩ 8,335
Operating and maintenance expenses related to rental income	(1,386)	(1,453)
Rental income from investment property, net of direct operating expense	₩ 8,732	₩ 6,882

Investment Properties - Summa_3

Investment Properties - Summary of Fair Value of Investment Properties (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2021	Dec. 31, 2020
Disclosure The fair value of investment property [Line Items]
Fair value of Investment property	₩ 282,338	₩ 344,598
Carrying amount of Investment property	212,784	225,195
Land
Disclosure The fair value of investment property [Line Items]
Fair value of Investment property	268,702	300,001
Carrying amount of Investment property	201,605	200,391
Buildings
Disclosure The fair value of investment property [Line Items]
Fair value of Investment property	13,636	44,597
Carrying amount of Investment property	₩ 11,179	₩ 24,804

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, 2021	Dec. 31, 2020	Dec. 31, 2019
Construction Services Contracts [Abstract]
Beginning balance	₩ 3,152,725	₩ 2,735,141	₩ 3,620,788
Increase and decrease
New orders and foreign exchange impact	458,635	1,512,460	390,224
Changes in scope of construction work	72,427	282,701	10,955
Increase (decrease) in Construction contracts from new orders and foreign exchange	386,208	1,229,759	379,269
Recognized as revenue	(754,998)	(812,175)	(1,264,916)
Ending balance	₩ 2,783,935	₩ 3,152,725	₩ 2,735,141

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, 2021	Dec. 31, 2020
Accumulated earned revenue, expense and others
Accumulated earned revenue		₩ 22,051,129	₩ 21,460,431
Accumulated expense		20,967,097	20,242,735
Accumulated profit		1,084,032	1,217,696
Unearned advance receipts		23,238	97,348
Construction Contract Assets and Liabilities [Abstract]
Assets	[1]	82,306	79,662
Liabilities	[2]	₩ 5,330	₩ 88,126
[1]	Included in trade and other receivables, net, in the consolidated statements of financial position. The balance of trade receivables from construction contracts are ￦39,063 million and ￦57,639 million, as of December 31, 2020 and 2021, respectively.
[2]	Included in non-financial liabilities as advance received in the consolidated statements of financial position. The revenue recognized on December 31, 2021 from the amounts included in contract liabilties at the end of the prior year is ￦87,934 million.

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, 2021	Dec. 31, 2020	Dec. 31, 2019
Changes in intangible assets other than goodwill
Impairment	₩ 0	₩ (3,599)	₩ (513,609)
Intangible assets other than goodwill
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	1,055,730	1,069,976
Changes in intangible assets other than goodwill
Acquisition	152,639	120,371
Disposal	(132)	(9,707)
Amortization	(166,161)	(170,466)
Impairment	14	(3,599)
Others	1,987	49,155
Ending balance	1,044,077	1,055,730	1,069,976
Intangible assets other than goodwill | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	3,769,026
Changes in intangible assets other than goodwill
Ending balance	3,940,927	3,769,026
Intangible assets other than goodwill | Accumulated amortization
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(2,138,536)
Changes in intangible assets other than goodwill
Ending balance	(2,310,088)	(2,138,536)
Intangible assets other than goodwill | Accumulated impairment [member]
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(562,303)
Changes in intangible assets other than goodwill
Ending balance	(575,454)	(562,303)
Intangible assets other than goodwill | Government grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(12,457)
Changes in intangible assets other than goodwill
Ending balance	(11,308)	(12,457)
Software
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	152,027
Changes in intangible assets other than goodwill
Ending balance	162,505	152,027
Software | Carrying Amount Other than Government Grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	152,163	164,995
Changes in intangible assets other than goodwill
Acquisition	18,834	14,101
Disposal	(1)	0
Amortization	(77,881)	(77,501)
Impairment	0	0
Others	69,481	50,568
Ending balance	162,596	152,163	164,995
Software | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	775,667
Changes in intangible assets other than goodwill
Ending balance	867,185	775,667
Software | Accumulated amortization
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(623,504)
Changes in intangible assets other than goodwill
Ending balance	(704,589)	(623,504)
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	0	0
Software | Government grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(136)	(235)
Changes in intangible assets other than goodwill
Acquisition	0	0
Disposal	0	0
Amortization	64	99
Impairment	0	0
Others	(19)	0
Ending balance	(91)	(136)	(235)
Licences and franchises
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	0
Changes in intangible assets other than goodwill
Ending balance		0
Licences and franchises | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	547
Changes in intangible assets other than goodwill
Ending balance		547
Licences and franchises | Accumulated amortization
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(547)
Changes in intangible assets other than goodwill
Ending balance		(547)
Licences and franchises | 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
Licences and franchises | Government grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	0
Changes in intangible assets other than goodwill
Ending balance		0
Copyrights, patents rights and other industrial rights
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	42,916
Changes in intangible assets other than goodwill
Ending balance	35,187	42,916
Copyrights, patents rights and other industrial rights | Carrying Amount Other than Government Grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	42,916	53,261
Changes in intangible assets other than goodwill
Acquisition	166	369
Disposal	(131)	(390)
Amortization	(7,771)	(8,352)
Impairment	0	0
Others	7	(1,972)
Ending balance	35,187	42,916	53,261
Copyrights, patents rights and other industrial rights | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	101,866
Changes in intangible assets other than goodwill
Ending balance	103,428	101,866
Copyrights, patents rights and other industrial rights | Accumulated amortization
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(49,772)
Changes in intangible assets other than goodwill
Ending balance	(59,063)	(49,772)
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	42,390
Changes in intangible assets other than goodwill
Ending balance	41,902	42,390
Mining rights | Carrying Amount Other than Government Grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	42,390	43,723
Changes in intangible assets other than goodwill
Acquisition	1,022	1,664
Disposal	0	0
Amortization	(3,526)	(4,380)
Impairment	0	0
Others	2,016	1,383
Ending balance	41,902	42,390	43,723
Mining rights | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	604,703
Changes in intangible assets other than goodwill
Ending balance	623,122	604,703
Mining rights | Accumulated amortization
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(34,062)
Changes in intangible assets other than goodwill
Ending balance	(39,803)	(34,062)
Mining rights | Accumulated impairment [member]
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(528,251)
Changes in intangible assets other than goodwill
Ending balance	(541,417)	(528,251)
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	90,123
Changes in intangible assets other than goodwill
Ending balance	69,124	90,123
Development expenditures | Carrying Amount Other than Government Grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	95,166	93,843
Changes in intangible assets other than goodwill
Acquisition	309	10,273
Disposal	0	0
Amortization	(37,033)	(32,034)
Impairment	0	0
Others	14,502	23,084
Ending balance	72,944	95,166	93,843
Development expenditures | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	958,035
Changes in intangible assets other than goodwill
Ending balance	978,768	958,035
Development expenditures | Accumulated amortization
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(862,850)
Changes in intangible assets other than goodwill
Ending balance	(905,805)	(862,850)
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	(19)	(19)
Development expenditures | Government grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(5,043)	(1,492)
Changes in intangible assets other than goodwill
Acquisition	0	0
Disposal	0	0
Amortization	1,439	1,453
Impairment	0	0
Others	(216)	(5,004)
Ending balance	(3,820)	(5,043)	(1,492)
Intangible assets under development
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	59,815
Changes in intangible assets other than goodwill
Ending balance	74,104	59,815
Intangible assets under development | Carrying Amount Other than Government Grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	67,018	60,490
Changes in intangible assets other than goodwill
Acquisition	51,988	53,638
Disposal	0	0
Amortization	0	0
Impairment	0	(23)
Others	(37,576)	(47,087)
Ending balance	81,430	67,018	60,490
Intangible assets under development | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	79,862
Changes in intangible assets other than goodwill
Ending balance	94,275	79,862
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	(12,844)
Changes in intangible assets other than goodwill
Ending balance	(12,845)	(12,844)
Intangible assets under development | Government grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(7,203)	(11,029)
Changes in intangible assets other than goodwill
Acquisition	0	0
Disposal	0	0
Amortization	0	0
Impairment	0	0
Others	(123)	3,826
Ending balance	(7,326)	(7,203)	(11,029)
Usage rights of donated assets and other
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	184,475
Changes in intangible assets other than goodwill
Impairment		0
Ending balance	169,783	184,475
Usage rights of donated assets and other | Carrying Amount Other than Government Grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	184,475	193,161
Changes in intangible assets other than goodwill
Acquisition	0	0
Disposal	0	0
Amortization	(13,594)	(18,448)
Impairment	0
Others	(1,098)	9,762
Ending balance	169,783	184,475	193,161
Usage rights of donated assets and other | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	592,930
Changes in intangible assets other than goodwill
Ending balance	592,870	592,930
Usage rights of donated assets and other | Accumulated amortization
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(408,455)
Changes in intangible assets other than goodwill
Ending balance	(423,087)	(408,455)
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	0	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	6,340
Changes in intangible assets other than goodwill
Impairment	0
Ending balance	5,848	6,340
Leasehold rights | Carrying Amount Other than Government Grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	6,340	5,318
Changes in intangible assets other than goodwill
Acquisition	0	0
Disposal	0	0
Amortization	(834)	(831)
Impairment		0
Others	342	1,853
Ending balance	5,848	6,340	5,318
Leasehold rights | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	27,843
Changes in intangible assets other than goodwill
Ending balance	28,185	27,843
Leasehold rights | Accumulated amortization
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(21,503)
Changes in intangible assets other than goodwill
Ending balance	(22,337)	(21,503)
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	61,373
Changes in intangible assets other than goodwill
Ending balance	78,137	61,373
Greenhouse gas emissions rights | Carrying Amount Other than Government Grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	61,373	41,656
Changes in intangible assets other than goodwill
Acquisition	78,091	37,109
Disposal	0	(9,271)
Amortization	(31)	0
Impairment	0	0
Others	(61,296)	(8,121)
Ending balance	78,137	61,373	41,656
Greenhouse gas emissions rights | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	61,373
Changes in intangible assets other than goodwill
Ending balance	78,137	61,373
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	416,271
Changes in intangible assets other than goodwill
Ending balance	407,487	416,271
Others | Carrying Amount Other than Government Grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	416,346	426,364
Changes in intangible assets other than goodwill
Acquisition	2,229	3,217
Disposal	0	(46)
Amortization	(26,998)	(30,476)
Impairment	14	(3,576)
Others	15,967	20,863
Ending balance	407,558	416,346	426,364
Others | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	566,200
Changes in intangible assets other than goodwill
Ending balance	574,957	566,200
Others | Accumulated amortization
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(137,843)
Changes in intangible assets other than goodwill
Ending balance	(155,404)	(137,843)
Others | Accumulated impairment [member]
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(12,011)
Changes in intangible assets other than goodwill
Ending balance	(11,995)	(12,011)
Others | Government grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(75)	(79)
Changes in intangible assets other than goodwill
Acquisition	0	0
Disposal	0	0
Amortization	4	4
Impairment	0	0
Others	0	0
Ending balance	₩ (71)	₩ (75)	₩ (79)

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, 2021KRW (₩)	Dec. 31, 2020KRW (₩)	Dec. 31, 2021AUD ($)	Dec. 31, 2020AUD ($)
Software | ERP system and others
Disclosure of intangible assets material to entity [line items]
Carrying value	₩ 3,817	₩ 81
Remaining amortisation period of intangible assets material to entity	2 years and 8 months	2 months ~ 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	₩ 4,936
Remaining amortisation period of intangible assets material to entity	9 months	1 year and 9 months
Copyrights, patents rights and other industrial rights | Contributions to ARP NRC DC
Disclosure of intangible assets material to entity [line items]
Carrying value	₩ 25,045	₩ 29,219
Remaining amortisation period of intangible assets material to entity	6 years	7 years
Mining rights | Mining right of Bylong mine
Disclosure of intangible assets material to entity [line items]
Carrying value	₩ 0	₩ 0	$ 0	$ 0
Remaining amortisation period of intangible assets material to entity	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.
Development expenditures | Electricity sales information system
Disclosure of intangible assets material to entity [line items]
Carrying value		₩ 8,229
Remaining amortisation period of intangible assets material to entity		1 year and 2 months
Usage rights of donated assets and other | Dangjin power plant load facility usage right
Disclosure of intangible assets material to entity [line items]
Carrying value		₩ 1,574
Remaining amortisation period of intangible assets material to entity		3 months
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	₩ 8,962	₩ 10,016
Remaining amortisation period of intangible assets material to entity	8 years and 6 months	9 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	₩ 22,310	₩ 26,847
Remaining amortisation period of intangible assets material to entity	4 years and 11 months	5 years and 11 months
Others | Occupancy and use of public waters
Disclosure of intangible assets material to entity [line items]
Carrying value	₩ 81,623	₩ 87,035
Remaining amortisation period of intangible assets material to entity	15 years and 1 month	16 years and 1 month
Others | Greenhouse gas emissions rights
Disclosure of intangible assets material to entity [line items]
Carrying value	₩ 78,137	₩ 61,373
Remaining amortisation period of intangible assets material to entity	—	0
Others | Business rights
Disclosure of intangible assets material to entity [line items]
Carrying value	₩ 160,459	₩ 166,207
Remaining amortisation period of intangible assets material to entity	27 years and 11 months	28 years and 11 months

Intangible Assets other than _5

Intangible Assets other than Goodwill - Summary of Recognized Research and Development Expenses (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Research And Development Expense [Abstract]
Research and development expense	₩ 689,397	₩ 700,642	₩ 735,715

Trade and Other Payables - Summ

Trade and Other Payables - Summary of Trade and Other Payables Explanatory (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Trade and other payables [Line Items]
Lease liabilities	₩ 4,410,503	₩ 4,621,096	₩ 5,070,133
Current trade and other payables
Trade and other payables [Line Items]
Trade payables	4,780,260	2,606,861
Non trade payables	1,536,976	1,785,068
Accrued expenses	1,174,765	1,197,815
Leasehold deposits received	1,699	2,336
Other deposits received	72,063	83,505
Lease liabilities	583,558	576,665
Dividends payable	4,105	4,271
Trade and other payables Others
Advance received from local governments	0	0
Others	0	0
Others	0	0
Total trade and other payables	8,153,426	6,256,521
Non-current trade and other payables
Trade and other payables [Line Items]
Trade payables	0	0
Non trade payables	2,032,260	2,324,965
Accrued expenses	8,095	2,038
Leasehold deposits received	741	943
Other deposits received	68,050	67,645
Lease liabilities	3,826,945	4,044,431
Dividends payable	0	0
Trade and other payables Others
Advance received from local governments	3,477	4,278
Others	56,930	36,112
Others	60,407	40,390
Total trade and other payables	₩ 5,996,498	₩ 6,480,412

Borrowings and Debt Securitie_2

Borrowings and Debt Securities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2021	Dec. 31, 2020
Current Borrowings and Debt Securities
Short-term borrowings	₩ 2,920,563	₩ 1,436,922
Current portion of long-term borrowings	1,463,703	677,982
Current portion of debt securities	9,652,986	8,565,301
Less : Current portion of discount on long-term borrowings	(2,048)	(1,723)
Less : Current portion of discount on debt securities	(5,370)	(3,677)
Current Borrowings and Debt Securities	14,029,834	10,674,805
Non-current Borrowings and Debt Securities
Long-term borrowings	2,278,481	3,018,898
Debt securities	64,385,784	56,188,234
Less : Discount on long-term borrowings	(12,857)	(14,899)
Less : Discount on debt securities	(152,760)	(143,823)
Add : Premium on debt securities	1,031	1,366
Non-current Borrowings and Debt Securities	66,499,679	59,049,776
Total	₩ 80,529,513	₩ 69,724,581

Borrowings and Debt Securitie_3

Borrowings and Debt Securities - Repayment Schedule of Borrowings and Debt Securities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2021	Dec. 31, 2020
Repayment schedule of borrowings and debt securities [Line Items]
Borrowings	₩ 6,662,747	₩ 5,133,802
Debt Securities	74,038,770	64,753,535
Less than 1 year
Repayment schedule of borrowings and debt securities [Line Items]
Borrowings	4,384,266	2,114,904
Debt Securities	9,652,986	8,565,301
1~5 Years
Repayment schedule of borrowings and debt securities [Line Items]
Borrowings	1,013,500	1,564,252
Debt Securities	34,156,038	28,746,117
Over 5 Years
Repayment schedule of borrowings and debt securities [Line Items]
Borrowings	1,264,981	1,454,646
Debt Securities	₩ 30,229,746	₩ 27,442,117

Borrowings and Debt Securitie_4

Borrowings and Debt Securities - Short-term Borrowings (Details) € in Thousands, $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2021KRW (₩)	Dec. 31, 2020KRW (₩)		Dec. 31, 2021USD ($)	Dec. 31, 2021EUR (€)	Dec. 31, 2020USD ($)
Disclosure of detailed information about Short-term borrowings [Line Items]
Short-term borrowings	₩ 2,920,563	₩ 1,436,922
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
Borrowings interest rate	1.96~4.60	0.80 ~ 4.60
Borrowings, maturity	2022.01.07 ~ 2022.12.31	2021.01.05 ~2021.12.31
Short-term borrowings	₩ 2,030,886	₩ 580,004		$ 0
Foreign short-term borrowings
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor	Shinhan Bank and others	Shinhan Bank
Borrowings interest rate	0.34~0.45	0.71 ~ 0.74
Borrowings, maturity	2022.01.04 ~ 2022.03.30	2021.01.04 ~2021.03.31
Short-term borrowings	₩ 186,755	₩ 60,268		157,533		$ 55,393
Foreign short-term borrowings
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor	Korea Development Bank and others	Korea Development Bank and others	[1]
Borrowings interest rate	1M Libor + 1.25	1M Libor + 1.25	[1]
Borrowings, maturity	2022.04.29	2022.04.29	[1]
Short-term borrowings	₩ 205,142	₩ 81,290	[1]	173,042		$ 73,704	[1]
Foreign short-term borrowings
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor	Shinhan Bank and others
Borrowings interest rate	0.57~0.80
Borrowings, maturity	2022.06.17 ~ 2022.08.31
Short-term borrowings	₩ 92,847			78,319
Local bank overdraft
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor	Korea Development Bank and others	Woori Bank
Borrowings interest rate	1.73~2.25	Standard overdraft rate + 1.26
Borrowings, maturity	2022.01.07 ~ 2022.02.26	2021.02.26
Short-term borrowings	₩ 208,018	₩ 29,960		0
Local bank overdraft
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor		Korea Development Bank and others
Borrowings interest rate		1.42 ~ 1.88
Borrowings, maturity		2021.01.07~ 2021.04.26
Short-term borrowings		₩ 215,400
Electronic short-term bonds
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor	BNK Securities and others	KB Securities and others
Borrowings interest rate	1.35~1.77	0.75 ~ 1.35
Borrowings, maturity	2022.01.21 ~ 2022.02.08	2021.01.13 ~2021.03.18
Short-term borrowings	₩ 100,000	₩ 470,000		$ 0
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
Borrowings, maturity	2022.06.28
Short-term borrowings	₩ 96,915				€ 72,199
[1]	The contractual maturity is 2022 but is classified as short-term borrowing due to intention of early redemption in 3 months after borrowing.

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, 2021KRW (₩)	Dec. 31, 2020KRW (₩)	Dec. 31, 2021USD ($)	Dec. 31, 2021JOD (JD)	Dec. 31, 2021JPY (¥)	Dec. 31, 2021EUR (€)	Dec. 31, 2020USD ($)	Dec. 31, 2020JOD (JD)	Dec. 31, 2020JPY (¥)
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings	₩ 3,742,184	₩ 3,696,880
Less : Discount on long-term borrowings	(14,905)	(16,622)
Less : Current portion of long-term borrowings	(1,463,703)	(677,982)
Add : Current portion of discount on long-term borrowings	2,048	1,723
Long-term borrowings	2,265,624	3,003,999
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings	₩ 2,720,355	₩ 2,485,062
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
Borrowings, maturity	2023~2044	2021~2044
Borrowings	₩ 2,509	₩ 2,946
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 interest rate	2.50~4.60	2.50~4.60
Borrowings, maturity	2022~2028	2021~2028
Borrowings	₩ 39,430	₩ 50,293
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	2.33	2.33
Borrowings, maturity	2022	2022
Borrowings	₩ 20,000	₩ 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	1yr KoFC bond rate +0.81~0.95	1yr KoFC bond rate +0.81~0.95
Borrowings, maturity	2022~2023	2022~2023
Borrowings	₩ 64,300	₩ 24,300
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Hana Bank	Hana Bank
Purpose of borrowings	Commercial Paper	Commercial Paper
Borrowings interest rate	3M CD+0.13~0.43	3M CD+0.13~0.32
Borrowings, maturity	2022~2025	2021~2024
Borrowings	₩ 1,050,000	₩ 1,150,000
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Hana Bank	Hana Bank
Purpose of borrowings	Facility	Facility
Borrowings interest rate	4.60	4.60
Borrowings, maturity	2028	2028
Borrowings	₩ 9,647	₩ 11,088
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Hana Bank	Hana Bank
Purpose of borrowings	Facility	Facility
Borrowings interest rate	3yr KTB rate-1.25	3yr KTB rate-1.25 Standard overdraft rate+1.50~2.45
Borrowings, maturity	2022~2028	2021~2035
Borrowings	₩ 4,485	₩ 43,419
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	IBK	IBK
Purpose of borrowings	PF Refinancing	PF Refinancing
Borrowings interest rate	CD+1.25	CD+1.25
Borrowings, maturity	2030	2030
Borrowings	₩ 8,589	₩ 9,543
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	Project loans	Project loans
Borrowings interest rate	1.50	1.50
Borrowings, maturity	2026	2026
Borrowings	₩ 13,258	₩ 16,204
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	Facility
Borrowings interest rate	1.32	1.32
Borrowings, maturity	2028	2028
Borrowings	₩ 32,000	₩ 32,000
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	Operating funds
Borrowings interest rate	1.78	1.78
Borrowings, maturity	2023	2023
Borrowings	₩ 15,700	₩ 15,700
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	Development of power resources	Development of power resources
Borrowings interest rate	3yr KTB rate-2.25	3yr KTB rate-2.25
Borrowings, maturity	2023~2025	2023~2025
Borrowings	₩ 8,971	₩ 2,509
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	Facility
Borrowings interest rate	3yr KTB rate-2.25	3yr KTB rate-2.25
Borrowings, maturity	2022~2024	2021~2024
Borrowings	₩ 995	₩ 1,527
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	Project loans
Borrowings interest rate	—	—
Borrowings, maturity	2023	2023
Borrowings	₩ 1,197	₩ 1,197
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	Others	Others
Borrowings interest rate	1.75	KTB rate-2.25
Borrowings, maturity	2028	2024~2028
Borrowings	₩ 4,893	₩ 14,045
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Shinhan Bank and others	Shinhan Bank
Purpose of borrowings	Facility	Facility
Borrowings interest rate	CB rate+1.10	CB rate+1.10
Borrowings, maturity	2028	2028
Borrowings	₩ 14,470	₩ 16,632
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Shinhan Bank and others	Shinhan Bank
Purpose of borrowings	Commercial paper	Others
Borrowings interest rate	3M CD+0.38	3.95
Borrowings, maturity	2025	2034
Borrowings	₩ 150,000	₩ 89,257
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Shinhan Bank and others	Shinhan Bank
Purpose of borrowings	Others	Others
Borrowings interest rate	3.95	Standard overdraft rate+1.00
Borrowings, maturity	2034	2034
Borrowings	₩ 84,179	₩ 89,257
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Shinhan Bank and others	Kookmin Bank
Purpose of borrowings	Others	Facility
Borrowings interest rate	Standard overdraft rate+1.00	MOR+0.79 3M CD+1.79
Borrowings, maturity	2034	2021~2031
Borrowings	₩ 84,179	₩ 46,512
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Kookmin Bank	Others
Purpose of borrowings	Facility	Facility
Borrowings interest rate	MOR+0.79 3M CD+1.79	1.75~6.80
Borrowings, maturity	2022~2031	2026~2037
Borrowings	₩ 59,333	₩ 510,262
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	2.80~6.80	CB rate+1.10~1.20 3M CD+1.60 Standard overdraft rate+1.50~2.45
Borrowings, maturity	2024~2039	2023~2037
Borrowings	₩ 620,185	₩ 89,506
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Others	Others
Purpose of borrowings	Facility	PF Refinancing
Borrowings interest rate	CB rate+0.90~1.10 3M CD+1.60 3.37	4.10
Borrowings, maturity	2028~2037	2030
Borrowings	₩ 171,733	₩ 26,509
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Others	Others
Purpose of borrowings	PF Refinancing	Others
Borrowings interest rate	3.80~5.00	3.90~7.90
Borrowings, maturity	2030~2034	2023~2039
Borrowings	₩ 71,742	₩ 222,356
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Others
Purpose of borrowings	PF Refinancing
Borrowings interest rate	1.75
Borrowings, maturity	2029
Borrowings	₩ 22,265
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Others
Purpose of borrowings	Others
Borrowings interest rate	4.40~7.90
Borrowings, maturity	2022~2038
Borrowings	₩ 116,367
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Others
Purpose of borrowings	Others
Borrowings interest rate	1.80~4.50
Borrowings, maturity	2031~2034
Borrowings	₩ 49,928
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings	₩ 1,021,829	₩ 1,211,818
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	—	—
Borrowings, maturity	2026	2021~2023
Borrowings	₩ 10,366	₩ 9,513	$ 8,744				$ 8,744
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	1M Libor+1.80~3.20	1M Libor+1.80~3.20
Borrowings, maturity	2036	2036
Borrowings	₩ 106,485	₩ 104,463	89,823				96,014
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	3M Libor+2.75~3.70	3M LIBOR+2.75~3.70
Borrowings, maturity	2027	2027
Borrowings	₩ 180,363	₩ 202,912		JD 107,868				JD 132,228
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	PF Loan	PF Loan
Borrowings interest rate	6M Libor+1.70~2.50	6M LIBOR+1.70~2.50
Borrowings, maturity	2032	2032
Borrowings	₩ 122,509	₩ 121,013	103,340				111,225
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	POSCO and others	Export-Import Bank of Korea and others
Purpose of borrowings	Shareholder’s loan	Others
Borrowings interest rate	8.00	3.88
Borrowings, maturity	2025	2021
Borrowings	₩ 14,171	₩ 314,986	11,953				289,509
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	POSCO and others	POSCO and others
Purpose of borrowings	Shareholder’s loan	Shareholder’s loan
Borrowings interest rate	8.00	8.00
Borrowings, maturity	2031	2023
Borrowings	₩ 8,114	₩ 15,298		JD 4,853			14,061
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Samsung Life Insurance and other	POSCO and others
Purpose of borrowings	Syndicated Loans	Shareholder’s loan
Borrowings interest rate	3.10~8.00	8.00
Borrowings, maturity	2032	2031
Borrowings	₩ 53,000	₩ 7,447			¥ 5,144,387			JD 4,853
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Woori Bank and others	Samsung Life Insurance and others
Purpose of borrowings	Syndicated Loans	Syndicated Loans
Borrowings interest rate	JPY 6M Libor+2.00	3.10
Borrowings, maturity	2032	2032
Borrowings	₩ 29,060	₩ 49,369			¥ 2,820,708				¥ 4,682,816
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	KiwoomSolar Power Professional Investor Private Placement Investment Trust V	Woori Bank and others
Purpose of borrowings	Senior borrowing	Syndicated Loans
Borrowings interest rate	3.90	JPY 6M Libor+2.00
Borrowings, maturity	2029	2032
Borrowings	₩ 48,741	₩ 31,847				€ 36,311			¥ 3,020,746
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	IFC and others	IFC and others
Purpose of borrowings	Others	Others
Borrowings interest rate	6M Libor+5.00	6M Libor+5.00
Borrowings, maturity	2031	2031
Borrowings	₩ 272,686	₩ 243,837	230,018				224,115
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Federal Financing Bank and others	Federal Financing Bank and others
Purpose of borrowings	PF Loans	PF Loans
Borrowings interest rate	2.39~6.00	2.39~6.00
Borrowings, maturity	2031~2038	2031~2038
Borrowings	₩ 111,597	₩ 105,913	94,135				97,347
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Others	Others
Purpose of borrowings	Others	Others
Borrowings interest rate	—	—
Borrowings, maturity	—	—
Borrowings	₩ 64,737	₩ 5,220	$ 54,607				$ 4,798

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, 2021KRW (₩)

Dec. 31, 2020KRW (₩)

Dec. 31, 2021USD ($)

Dec. 31, 2021EUR (€)

Dec. 31, 2021SEK (kr)

Dec. 31, 2021HKD ($)

Dec. 31, 2021CHF (SFr)

Dec. 31, 2021AUD ($)

Dec. 31, 2020USD ($)

Dec. 31, 2020EUR (€)

Dec. 31, 2020SEK (kr)

Dec. 31, 2020HKD ($)

Dec. 31, 2020CHF (SFr)

Dec. 31, 2020AUD ($)

Debt Instrument [Line Items]

Bonds issued

₩ 74,038,770

₩ 64,753,535

Local Debt securities

Debt Instrument [Line Items]

Bonds issued

62,274,472

54,273,577

Less : Discount on debt securities

(52,723)

(46,730)

Less : Current portion of debt securities

(7,432,647)

(7,243,217)

Add : Current portion of discount on debt securities

2,510

2,108

Total

₩ 54,791,612

₩ 46,985,738

Electricity Bonds

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2012.01.15~ 2021.12.23

2012.01.15~ 2021.12.23

Debt Instrument, Maturity Date, Description

2022.01.05~ 2049.10.24

2022.01.05~ 2049.10.24

Interest rate (%)

1.02~4.20

1.02~4.20

Bonds issued

₩ 34,080,000

₩ 27,810,000

Corporate bonds

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

[1]

2009.10.16~ 2021.11.22

2009.10.16~ 2021.11.22

Debt Instrument, Maturity Date, Description

[1]

2022.01.19~ 2051.11.22

2022.01.19~ 2051.11.22

Interest rate (%)

[1]

0.86~6.00

0.86~6.00

Bonds issued

[1]

₩ 28,194,472

₩ 26,463,577

Foreign Debt securities

Debt Instrument [Line Items]

Bonds issued

11,764,298

10,479,958

Less : Discount on debt securities

(105,407)

(100,770)

Add : Premium on debt securities

1,031

1,366

Less : Current portion of debt securities

(2,220,339)

(1,322,084)

Add : Current portion of discount on debt securities

2,860

1,569

Total

₩ 9,442,443

₩ 9,060,039

FY-96

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

1996.04.01~ 1996.12.06

1996.04.01~ 1996.12.06

Debt Instrument, Maturity Date, Description

2026.12.01~ 2096.04.01

2026.12.01~ 2096.04.01

Interest rate (%)

6.00~7.95

6.00~7.95

Bonds issued

₩ 330,400

₩ 303,227

$ 278,701

$ 278,701

FY-97

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

1997.01.31~ 1997.08.04

1997.01.31~ 1997.08.04

Debt Instrument, Maturity Date, Description

2027.02.01~ 2027.08.01

2027.02.01~ 2027.08.01

Interest rate (%)

6.75~7.00

6.75~7.00

Bonds issued

₩ 373,097

₩ 342,412

314,717

314,717

FY-04

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2004.04.23

2004.04.23

Debt Instrument, Maturity Date, Description

2034.04.23

2034.04.23

Interest rate (%)

5.13

5.13

Bonds issued

₩ 340,144

₩ 312,169

286,920

286,920

FY-11

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2011.07.13

Debt Instrument, Maturity Date, Description

2021.07.13

Interest rate (%)

4.75

Bonds issued

₩ 544,000

500,000

FY-12

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2012.09.19

2012.09.19

Debt Instrument, Maturity Date, Description

2022.09.19

2022.09.19

Interest rate (%)

3.00

3.00

Bonds issued

₩ 889,125

₩ 816,000

750,000

750,000

FY-14

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2014.07.30

2014.07.30

Debt Instrument, Maturity Date, Description

2029.07.30

2029.07.30

Interest rate (%)

3.57

3.57

Bonds issued

₩ 118,550

₩ 108,800

100,000

100,000

FY-15

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2015.06.15

2015.06.15

Debt Instrument, Maturity Date, Description

2025.06.15

2025.06.15

Interest rate (%)

3.25

3.25

Bonds issued

₩ 355,650

₩ 326,400

300,000

300,000

FY-16

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2016.01.21

Debt Instrument, Maturity Date, Description

2021.07.21

Interest rate (%)

2.50

Bonds issued

₩ 326,400

300,000

FY-17

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2017.06.19~ 2017.07.25

2017.06.19~ 2017.07.25

Debt Instrument, Maturity Date, Description

2022.06.19~ 2027.07.25

2022.06.19~ 2027.07.25

Interest rate (%)

2.63~3.13

2.63~3.13

Bonds issued

₩ 948,400

₩ 870,400

800,000

800,000

FY-17

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2017.10.30

2017.10.30

Debt Instrument, Maturity Date, Description

2037.10.30

2037.10.30

Interest rate (%)

1.70

1.70

Bonds issued

₩ 53,694

₩ 53,530

€ 40,000

€ 40,000

FY-17

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2017.11.16

2017.11.16

Debt Instrument, Maturity Date, Description

2037.11.16

2037.11.16

Interest rate (%)

2.36

2.36

Bonds issued

₩ 58,968

₩ 59,747

kr 450,000

kr 450,000

FY-18

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2018.03.13

2018.01.29~ 2018.07.25

Debt Instrument, Maturity Date, Description

2028.03.13

2021.01.29~ 2023.07.25

Interest rate (%)

3.35

3.00~3.88

Bonds issued

₩ 250,850

₩ 1,958,400

$ 1,650,000

1,800,000

FY-18

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2018.06.07~ 2018.07.25

2018.03.13

Debt Instrument, Maturity Date, Description

2023.06.07~ 2023.07.25

2028.03.13

Interest rate (%)

3.75~3.88

3.35

Bonds issued

₩ 1,659,700

₩ 231,578

1,400,000

$ 1,650,000

FY-19

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2019.01.22~ 2019.06.24

2019.01.22~ 2019.06.24

Debt Instrument, Maturity Date, Description

2022.01.22~ 2024.06.24

2022.01.22~ 2024.06.24

Interest rate (%)

2.50~3.38

2.50~3.38

Bonds issued

₩ 948,400

₩ 870,400

800,000

800,000

FY-19

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2019.02.27

2019.02.27

Debt Instrument, Maturity Date, Description

2024.02.27

2024.02.27

Interest rate (%)

0.13

0.13

Bonds issued

₩ 259,494

₩ 246,866

SFr 200,000

SFr 200,000

FY-19

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2019.07.19

2019.07.19

Debt Instrument, Maturity Date, Description

2024.07.19~ 2027.07.19

2024.07.19~ 2027.07.19

Interest rate (%)

0.00~0.05

0.00~0.05

Bonds issued

₩ 389,241

₩ 370,299

SFr 300,000

SFr 300,000

FY-19

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2019.07.22

2019.07.22

Debt Instrument, Maturity Date, Description

2022.07.22

2022.07.22

Interest rate (%)

2.38

2.38

Bonds issued

₩ 355,650

₩ 326,400

300,000

300,000

FY-19

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2019.10.30

2019.10.30

Debt Instrument, Maturity Date, Description

2024.10.30

2024.10.30

Interest rate (%)

3M BBSW+0.97

3M BBSW+0.97

Bonds issued

₩ 257,667

₩ 250,968

$ 300,000

$ 300,000

FY-19

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2019.12.19

2019.12.19

Debt Instrument, Maturity Date, Description

2037.12.31

2037.12.31

Interest rate (%)

3.30~5.70

3.30~5.70

Bonds issued

₩ 440,943

₩ 421,163

371,947

387,098

FY-20

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2020.02.03

2020.02.03

Debt Instrument, Maturity Date, Description

2025.02.03

2025.02.03

Interest rate (%)

2.13

2.13

Bonds issued

₩ 355,650

₩ 326,400

300,000

300,000

FY-20

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2020.05.06

2020.06.15

Debt Instrument, Maturity Date, Description

2025.05.06

2025.06.15

Interest rate (%)

1.75

1.13

Bonds issued

₩ 592,750

₩ 544,000

500,000

500,000

FY-20

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2020.06.15

2020.05.06

Debt Instrument, Maturity Date, Description

2025.06.15

2025.05.06

Interest rate (%)

1.13

1.75

Bonds issued

₩ 592,750

₩ 544,000

500,000

500,000

FY-20

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2020.08.03

2020.08.03

Debt Instrument, Maturity Date, Description

2026.02.03

2026.02.03

Interest rate (%)

0.61

0.61

Bonds issued

₩ 355,650

₩ 326,399

300,000

$ 300,000

FY-21

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2021.01.27

Debt Instrument, Maturity Date, Description

2026.01.27

Interest rate (%)

0.75

Bonds issued

₩ 533,475

450,000

FY-21

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2021.04.27

Debt Instrument, Maturity Date, Description

2026.04.27

Interest rate (%)

1.25

Bonds issued

₩ 592,750

500,000

FY-21

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2021.08.09

Debt Instrument, Maturity Date, Description

2026.08.09

Interest rate (%)

1.25

Bonds issued

₩ 355,650

300,000

FY-21

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2021.09.24

Debt Instrument, Maturity Date, Description

2026.09.24

Interest rate (%)

1.13

Bonds issued

₩ 355,650

$ 300,000

[1]

Among the corporate bonds, each holder of Hee mang sunlight Power Co., Ltd.’s private equity bonds, amounting to ￦2,697 million, may exercise the right of early redemption on the 5th year (March 31, 2021) from the date of issuance of the bond and every year on March 31 thereafter, until the year before the redemption date.

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, 2021KRW (₩)
Debt Instrument [Line Items]
Value of bonds entitled to premature redemption	₩ 2,697
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, 2021	Dec. 31, 2020
Changes In Borrowings and Debt Securities [Line Items]
Beginning balance	₩ 74,345,677	₩ 72,946,674
Cash flows	9,081,358	1,924,810
Ending balance	84,940,016	74,345,677
Borrowings and debt securities
Changes In Borrowings and Debt Securities [Line Items]
Beginning balance	69,724,581	67,876,541
Cash flows	9,653,394	2,538,787
Effect of exchange rate fluctuations	1,001,493	(640,304)
Others	150,045	(50,443)
Ending balance	₩ 80,529,513	₩ 69,724,581

Lease - Additional Information

Lease - Additional Information (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Statements [Line Items]
Expense relating to short-term leases for which recognition exemption has been used	₩ 199,490	₩ 45,787
Expense relating to leases of low-value assets for which recognition exemption has been used	2,349	2,796
Cash outflow related to leases	922,200	807,609
Discounted unguaranteed residual value of assets	₩ 19,574	₩ 16,407
Maximum
Statements [Line Items]
Implicit interest rate on finance lease	16.83%	16.60%
Minimum
Statements [Line Items]
Implicit interest rate on finance lease	0.00%	1.39%
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
Fly Ash Pipe Conduit | Power Purchase Agreement
Statements [Line Items]
Average Lease Term	7 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, 2021		Dec. 31, 2020
Disclosure of quantitative information about right-of-use assets [line items]
Increase		₩ 12,614,177		₩ 13,593,937
Depreciation		(554,615)		(586,254)
Right-of-use assets
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		4,542,166		4,783,573
Increase		78,213		291,334
Depreciation		(554,615)		(586,254)
Decrease		(11,787)		(827)
Others		5,420		54,340
Ending balance		4,059,397		4,542,166
Right-of-use assets | Acquisition cost
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		7,905,214
Ending balance		7,848,138		7,905,214
Right-of-use assets | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		(3,363,048)
Ending balance		(3,788,741)		(3,363,048)
Land
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		706,579		644,074
Increase		7,312		12,269
Depreciation		(57,231)		(52,069)
Decrease		0		0
Others		(3,865)		102,305
Ending balance		652,795		706,579
Land | Acquisition cost
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		811,014
Ending balance		814,795		811,014
Land | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		(104,435)
Ending balance		(162,000)		(104,435)
Buildings
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		47,222		34,577
Increase		22,336		53,182
Depreciation		(25,780)		(37,609)
Decrease		(1,469)		(803)
Others		20,575		(2,125)
Ending balance		62,884		47,222
Buildings | Acquisition cost
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		82,749
Ending balance		106,823		82,749
Buildings | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		(35,527)
Ending balance		(43,939)		(35,527)
Structures
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		20,486		25,644
Increase		2,198		260
Depreciation		(1,536)		(1,485)
Decrease		0		0
Others		0		(3,933)
Ending balance		21,148		20,486
Structures | Acquisition cost
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		24,175
Ending balance		26,374		24,175
Structures | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		(3,689)
Ending balance		(5,226)		(3,689)
Machinery
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		695		824
Increase		0		0
Depreciation		(130)		(129)
Decrease		0		0
Others		0		0
Ending balance		565		695
Machinery | Acquisition cost
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		1,308
Ending balance		1,308		1,308
Machinery | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		(613)
Ending balance		(743)		(613)
Ships
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		3,437,363		3,688,289
Increase		9,694		183,789
Depreciation		(411,291)		(427,221)
Decrease		0		0
Others		(6,547)		(7,494)
Ending balance		3,029,219		3,437,363
Ships | Acquisition cost
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		4,280,331
Ending balance		4,217,735		4,280,331
Ships | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		(842,968)
Ending balance		(1,188,516)		(842,968)
Vehicles
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		13,525		13,708
Increase		9,583		9,009
Depreciation		(8,162)		(7,747)
Decrease		(7)		(21)
Others		(1,321)		(1,424)
Ending balance		13,618		13,525
Vehicles | Acquisition cost
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		29,281
Ending balance		30,375		29,281
Vehicles | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		(15,756)
Ending balance		(16,757)		(15,756)
Others
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		316,296	[1]	376,457
Increase		27,090		32,825
Depreciation		(50,485)		(59,994)
Decrease		(10,311)		(3)
Others		(3,422)		(32,989)
Ending balance		279,168	[2]	316,296	[1]
Others | Acquisition cost
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance	[1]	2,676,356
Ending balance		2,650,728	[2]	2,676,356	[1]
Others | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance	[1]	(2,360,060)
Ending balance		₩ (2,371,560)	[2]	₩ (2,360,060)	[1]
[1]	Including power purchase agreements (“PPA”) with GS EPS and another LNG combined power supplier.
[2]	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, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of maturity analysis of operating lease payments [line items]
Undiscounted operating lease payments to be received	₩ 4,928,988	₩ 5,209,537
Less : Discount	(518,485)	(588,441)
Present value of lease payment	4,410,503	4,621,096	₩ 5,070,133
Less than 1 year
Disclosure of maturity analysis of operating lease payments [line items]
Undiscounted operating lease payments to be received	620,121	614,442
1~5 Years
Disclosure of maturity analysis of operating lease payments [line items]
Undiscounted operating lease payments to be received	2,158,145	2,133,538
More than 5 years
Disclosure of maturity analysis of operating lease payments [line items]
Undiscounted operating lease payments to be received	₩ 2,150,722	₩ 2,461,557

Lease - Summary of Liquidity Cl

Lease - Summary of Liquidity Classification of Lease Liabilities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Lease liabilities [abstract]
Current lease liabilities	₩ 583,558	₩ 576,665
Non-current lease liabilities	3,826,945	4,044,431
Total lease liabilities	₩ 4,410,503	₩ 4,621,096	₩ 5,070,133

Lease - Summary of Changes in L

Lease - Summary of Changes in Lease Liabilities (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020
Disclosure - Changes in lease liabilities [Abstract]
Beginning balance		₩ 4,621,096	₩ 5,070,133
Increase		73,090	280,114
Decrease		(665,687)	(725,759)
Interest expenses		93,651	111,782
Others	[1]	288,353	(115,174)
Ending balance		₩ 4,410,503	₩ 4,621,096
[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, 2021	Dec. 31, 2020
Disclosure - Details of expense relating to lease contracts as lessee [Abstract]
Depreciation of right-of-use assets	₩ 554,615	₩ 586,254
Interest expense on lease liabilities	93,651	111,782
Leases expenses for short-term leases	199,490	45,787
Leases expenses for leases of low-value assets	2,349	2,796
Variable lease payments	54,675	33,267
Total expense relating to lease contracts as lessee	₩ 904,780	₩ 779,886

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, 2021	Dec. 31, 2020
Disclosure of quantitative information about leases for lessor [abstract]
Finance income on the net investment in the lease	₩ 111,569	₩ 117,763

Lease - Summary of Maturity Ana

Lease - Summary of Maturity Analysis of Finance Lease Payments Receivable (Details) - Gross amount - KRW (₩) ₩ in Millions		Dec. 31, 2021	Dec. 31, 2020
Disclosure of maturity analysis of finance lease payments receivable [line items]
Undiscounted finance lease payments to be received		₩ 2,395,319	₩ 2,315,752
Less : Unearned finance income		(1,194,627)	(1,192,686)
Net investment in finance lease	[1]	1,200,692	1,123,066
Not Later Than 1 Year
Disclosure of maturity analysis of finance lease payments receivable [line items]
Undiscounted finance lease payments to be received		172,528	162,211
1~2 Years
Disclosure of maturity analysis of finance lease payments receivable [line items]
Undiscounted finance lease payments to be received		163,937	148,485
2~3 Years
Disclosure of maturity analysis of finance lease payments receivable [line items]
Undiscounted finance lease payments to be received		158,933	144,913
3~4 Years
Disclosure of maturity analysis of finance lease payments receivable [line items]
Undiscounted finance lease payments to be received		156,450	139,605
4~5 Years
Disclosure of maturity analysis of finance lease payments receivable [line items]
Undiscounted finance lease payments to be received		155,068	136,962
More than 5 years
Disclosure of maturity analysis of finance lease payments receivable [line items]
Undiscounted finance lease payments to be received		₩ 1,588,403	₩ 1,583,576
[1]	Including the present value of unguaranteed residual value amounting to ￦16,407 million and ￦19,574 million, as of December 31, 2020 and 2021, 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, 2021	Dec. 31, 2020
Changes in the allowance for doubtful accounts of finance lease receivables [Abstract]
Beginning balance	₩ 990	₩ 862
Bad debt expense	0	128
Reversal of allowance for doubtful accounts	(222)	0
Ending balance	₩ 768	₩ 990

Employment Benefits - Summary o

Employment Benefits - Summary of Employment Benefits (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2021	Dec. 31, 2020
Employment Benefits [Abstract]
Net defined benefit asset	₩ 20,871	₩ 7,231
Net defined benefit obligations	1,675,741	1,907,013
Other long-term employee benefit obligations	₩ 3,417	₩ 3,847

Employment Benefits - Summary_2

Employment Benefits - Summary of Principal Assumptions on Actuarial Valuation (Details) - yr	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Statement [Line Items]
Future salary and benefit levels	4.28%	4.28%
Weighted average duration	10.39	10.77
Bottom of range [member]
Statement [Line Items]
Discount rate	2.51	1.87
Top of range [member]
Statement [Line Items]
Discount rate	2.60	2.12

Employment Benefits - Summary_3

Employment Benefits - Summary of Expense Relating to defined Benefit Plans (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure - Details of expense relating to defined benefit plans [Abstract]
Current service cost	₩ 524,942	₩ 509,520	₩ 440,300
Interest cost	91,877	83,248	83,619
Expected return on plan assets	(52,782)	(42,742)	(41,597)
Past service cost	5,483	(2,027)	301,442
Loss from settlement	0	0	(2,017)
Defined benefit	₩ 569,520	₩ 547,999	₩ 781,747

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, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of defined benefit plans [line items]
Defined benefit	₩ 569,520	₩ 547,999	₩ 781,747
Cost of sales [member]
Disclosure of defined benefit plans [line items]
Defined benefit	415,959	397,442	580,623
Selling, general and administrative expense [member]
Disclosure of defined benefit plans [line items]
Defined benefit	95,983	94,846	120,455
Others (Construction-in-progress and others) [member]
Disclosure of defined benefit plans [line items]
Defined benefit	₩ 57,578	₩ 55,711	₩ 80,669

Employment Benefits - Summary_5

Employment Benefits - Summary of Defined Benefits (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2021	Dec. 31, 2020
Surplus (deficit) in plan [abstract]
Present value of defined benefit obligation from funded plans	₩ 4,564,417	₩ 4,570,614
Fair value of plan assets	(2,909,547)	(2,670,832)
Net liabilities incurred from defined benefit plans	₩ 1,654,870	₩ 1,899,782

Employment Benefits - Net Defin

Employment Benefits - Net Defined Benefit Liability and Asset (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of defined benefit plans [line items]
Beginning balance	₩ 1,899,782
Changes in net defined benefit liability (asset)
Current service cost	524,942	₩ 509,520	₩ 440,300
Remeasurement component	(337,298)	84,775
Past service cost	5,483	(2,027)	301,442
Ending balance	1,654,870	1,899,782
Defined benefit obligation
Disclosure of defined benefit plans [line items]
Beginning balance	4,570,614	4,035,400
Changes in net defined benefit liability (asset)
Current service cost	524,942	509,520
Interest cost	91,877	83,248
Remeasurement component	(345,755)	84,385
Past service cost	5,483	(2,027)
Actual payments	(282,794)	(139,956)
Others	50	44
Ending balance	4,564,417	4,570,614	4,035,400
Plan assets
Disclosure of defined benefit plans [line items]
Beginning balance	2,670,832	2,111,313
Changes in net defined benefit liability (asset)
Interest cost	52,782	42,742
Remeasurement component	(8,457)	(390)
Contributions by the employers	317,707	582,275
Actual payments	(123,317)	(65,108)
Ending balance	₩ 2,909,547	₩ 2,670,832	₩ 2,111,313

Employment Benefits - Summary_6

Employment Benefits - Summary of the Fair Value of Plan Assets (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2021	Dec. 31, 2020
Disclosure of fair value of plan assets [abstract]
Equity instruments	₩ 344,002	₩ 253,358
Debt instruments	744,167	822,582
Bank deposits	407,809	284,655
Others	1,413,569	1,310,237
Plan assets	₩ 2,909,547	₩ 2,670,832

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, 2021	Dec. 31, 2020
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	₩ (258,194)	₩ (2,979)
Experience adjustments	(87,561)	87,364
Expected return	8,457	390
Total loss (gain) on remeasurement, net defined benefit liability (asset)	₩ (337,298)	₩ 84,775

Employment Benefits - Additiona

Employment Benefits - Additional Information (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Employment Benefit Obligations [Line Items]
Loss on accumulated remeasurement components	₩ 98,844	₩ 169,234
Return on plan assets	44,325	42,352
Construction In Process And Others
Disclosure Of Employment Benefit Obligations [Line Items]
Employee benefit expense	13,126	11,861	₩ 13,893
Cost of sales
Disclosure Of Employment Benefit Obligations [Line Items]
Employee benefit expense	71,875	60,587	71,844
Selling and administrative expense
Disclosure Of Employment Benefit Obligations [Line Items]
Employee benefit expense	₩ 17,144	₩ 9,121	₩ 12,775

Provisions (Details)

Provisions (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of changes in other provisions
Beginning balance	₩ 22,527,236	₩ 21,670,769
Changes in other provisions
Increase in provision	5,659,564	3,911,898
Payment	(2,686,288)	(3,018,343)
Reversal of unused amount	(93,662)	10,640
Others	(59,550)	(47,728)
Ending balance	25,347,300	22,527,236
Current Provisions
Reconciliation of changes in other provisions
Beginning balance	2,451,664
Changes in other provisions
Ending balance	2,845,876	2,451,664
Noncurrent Provisions
Reconciliation of changes in other provisions
Beginning balance	20,075,572
Changes in other provisions
Ending balance	22,501,424	20,075,572
Provisions for employment benefits
Reconciliation of changes in other provisions
Beginning balance	1,024,574	975,619
Changes in other provisions
Increase in provision	1,048,569	1,078,382
Payment	(1,024,212)	(1,028,218)
Reversal of unused amount	0	0
Others	8	(1,209)
Ending balance	1,048,939	1,024,574
Provisions for employment benefits | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	1,024,574
Changes in other provisions
Ending balance	1,048,939	1,024,574
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	113,002	88,398
Changes in other provisions
Increase in provision	67,443	81,990
Payment	(44,446)	(34,662)
Reversal of unused amount	(15,763)	(22,724)
Others	(5,518)	0
Ending balance	114,718	113,002
Litigation provisions | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	46,287
Changes in other provisions
Ending balance	26,269	46,287
Litigation provisions | Noncurrent Provisions
Reconciliation of changes in other provisions
Beginning balance	66,715
Changes in other provisions
Ending balance	88,449	66,715
Provisions For Nuclear Plants Restoration
Reconciliation of changes in other provisions
Beginning balance	16,974,884	15,994,039
Changes in other provisions
Increase in provision	2,545,803	1,028,580
Payment	(59,226)	(47,735)
Reversal of unused amount	0	0
Others	0	0
Ending balance	19,461,461	16,974,884
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	16,974,884
Changes in other provisions
Ending balance	19,461,461	16,974,884
Spent fuel recovery provisions
Reconciliation of changes in other provisions
Beginning balance	1,354,001	1,355,280
Changes in other provisions
Increase in provision	452,063	394,642
Payment	(455,402)	(395,921)
Reversal of unused amount	0	0
Others	0	0
Ending balance	1,350,662	1,354,001
Spent fuel recovery provisions | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	487,529
Changes in other provisions
Ending balance	457,466	487,529
Spent fuel recovery provisions | Noncurrent Provisions
Reconciliation of changes in other provisions
Beginning balance	866,472
Changes in other provisions
Ending balance	893,196	866,472
Radioactive waste recovery provisions
Reconciliation of changes in other provisions
Beginning balance	1,891,613	1,888,082
Changes in other provisions
Increase in provision	3,862	71,529
Payment	(51,666)	(67,998)
Reversal of unused amount	(11,274)	0
Others	0	0
Ending balance	1,832,535	1,891,613
Radioactive waste recovery provisions | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	46,369
Changes in other provisions
Ending balance	137,342	46,369
Radioactive waste recovery provisions | Noncurrent Provisions
Reconciliation of changes in other provisions
Beginning balance	1,845,244
Changes in other provisions
Ending balance	1,695,193	1,845,244
PCBs recovery provisions
Reconciliation of changes in other provisions
Beginning balance	119,019	152,981
Changes in other provisions
Increase in provision	2,182	3,017
Payment	(17,408)	(14,839)
Reversal of unused amount	(128)	(22,140)
Others	0	0
Ending balance	103,665	119,019
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	119,019
Changes in other provisions
Ending balance	103,665	119,019
Other recovery provisions
Reconciliation of changes in other provisions
Beginning balance	25,840	10,773
Changes in other provisions
Increase in provision	553	15,280
Payment	(169)	0
Reversal of unused amount	0	0
Others	4,007	(213)
Ending balance	30,231	25,840
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	25,840
Changes in other provisions
Ending balance	30,231	25,840
Power plant regional support program provisions
Reconciliation of changes in other provisions
Beginning balance	144,272	140,133
Changes in other provisions
Increase in provision	49,596	39,445
Payment	(47,280)	(42,935)
Reversal of unused amount	0	0
Others	0	7,629
Ending balance	146,588	144,272
Power plant regional support program provisions | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	144,272
Changes in other provisions
Ending balance	146,588	144,272
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	96,895	139,785
Changes in other provisions
Increase in provision	306,409	151,796
Payment	(153,016)	(194,686)
Reversal of unused amount	0	0
Others	0	0
Ending balance	250,288	96,895
Transmission regional support program provisions | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	96,895
Changes in other provisions
Ending balance	250,288	96,895
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 tax
Reconciliation of changes in other provisions
Beginning balance	0	0
Changes in other provisions
Increase in provision		0
Payment		(24)
Reversal of unused amount		25
Others		(1)
Ending balance		0
Provisions for financial guarantee
Reconciliation of changes in other provisions
Beginning balance	66,354	81,357
Changes in other provisions
Increase in provision	85,355	11,303
Payment	(72,109)	(20,962)
Reversal of unused amount	0	(5,317)
Others	1,241	(27)
Ending balance	80,841	66,354
Provisions for financial guarantee | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	22,250
Changes in other provisions
Ending balance	21,032	22,250
Provisions for financial guarantee | Noncurrent Provisions
Reconciliation of changes in other provisions
Beginning balance	44,104
Changes in other provisions
Ending balance	59,809	44,104
Provisions for RPS
Reconciliation of changes in other provisions
Beginning balance	9,126	2,889
Changes in other provisions
Increase in provision	445,402	494,199
Payment	(430,344)	(487,962)
Reversal of unused amount	(24,184)	0
Others	0	0
Ending balance	0	9,126
Provisions for RPS | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	9,126
Changes in other provisions
Ending balance	0	9,126
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	393,121	682,459
Changes in other provisions
Increase in provision	547,911	331,684
Payment	(235,469)	(633,482)
Reversal of unused amount	(2,174)	65,389
Others	(47,845)	(52,929)
Ending balance	655,544	393,121
Provisions for greenhouse gas emissions obligations | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	393,121
Changes in other provisions
Ending balance	655,544	393,121
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	314,535	158,974
Changes in other provisions
Increase in provision	104,416	210,051
Payment	(95,541)	(48,919)
Reversal of unused amount	(40,139)	(4,593)
Others	(11,443)	(978)
Ending balance	271,828	314,535
Others | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	181,241
Changes in other provisions
Ending balance	102,408	181,241
Others | Noncurrent Provisions
Reconciliation of changes in other provisions
Beginning balance	133,294
Changes in other provisions
Ending balance	₩ 169,420	₩ 133,294

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, 2021kT
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	57,711
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	15,625
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	15,782
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	15,782
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	5,261
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	5,261

Provisions - Summary of Changes

Provisions - Summary of Changes in Greenhouse Gas Emissions Rights (Detail) ₩ in Millions	12 Months Ended
	Dec. 31, 2021KRW (₩)kT	Dec. 31, 2020KRW (₩)kT
2nd planned period [Member]
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Line Items]
Quantity Beginning | kT	17,905	17,276
Purchase (sell) | kT		723
Government submission | kT		0
Borrowing (carryforward) | kT		(94)
Quantity Ending | kT		17,905
Balance Beginning | ₩	₩ 357,355	₩ 18,306
Purchase (sell) | ₩		270,338
Government submission | ₩		0
Borrowing (carryforward) | ₩		68,711
Balance Ending | ₩		₩ 357,355
2nd planned period [Member] | Period 2020 [Member]
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Line Items]
Quantity Beginning | kT	17,905
Purchase (sell) | kT	433
Government submission | kT	(17,560)
Borrowing (carryforward) | kT	(539)
Others | kT	(239)
Quantity Ending | kT	0	17,905
Balance Beginning | ₩	₩ 357,355
Purchase (sell) | ₩	95,375
Government submission | ₩	(280,924)
Borrowing (carryforward) | ₩	(113,014)
Others | ₩	(58,792)
Balance Ending | ₩	₩ 0	₩ 357,355
3rd planned period [Member]
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Line Items]
Quantity Beginning | kT	58,137
Purchase (sell) | kT	1,227
Government submission | kT	0
Borrowing (carryforward) | kT	639
Others | kT	0
Quantity Ending | kT	60,003	58,137
Balance Beginning | ₩	₩ 38,338
Purchase (sell) | ₩	429,747
Government submission | ₩	0
Borrowing (carryforward) | ₩	134,710
Others | ₩	0
Balance Ending | ₩	₩ 602,795	₩ 38,338
3rd planned period [Member] | Period 2021 [Member]
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Line Items]
Quantity Beginning | kT	16,051
Purchase (sell) | kT	1,426
Government submission | kT	0
Borrowing (carryforward) | kT	352
Others | kT	0
Quantity Ending | kT	17,829	16,051
Balance Beginning | ₩	₩ 38,338
Purchase (sell) | ₩	410,099
Government submission | ₩	0
Borrowing (carryforward) | ₩	76,221
Others | ₩	0
Balance Ending | ₩	₩ 524,658	₩ 38,338
3rd planned period [Member] | Period 2022 [Member]
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Line Items]
Quantity Beginning | kT	15,782
Purchase (sell) | kT	(31)
Government submission | kT	0
Borrowing (carryforward) | kT	277
Others | kT	0
Quantity Ending | kT	16,028	15,782
Balance Beginning | ₩	₩ 0
Purchase (sell) | ₩	7,296
Government submission | ₩	0
Borrowing (carryforward) | ₩	55,439
Others | ₩	0
Balance Ending | ₩	₩ 62,735	₩ 0
3rd planned period [Member] | Period 2023 [Member]
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Line Items]
Quantity Beginning | kT	15,782
Purchase (sell) | kT	(43)
Government submission | kT	0
Borrowing (carryforward) | kT	10
Others | kT	0
Quantity Ending | kT	15,749	15,782
Balance Beginning | ₩	₩ 0
Purchase (sell) | ₩	5,479
Government submission | ₩	0
Borrowing (carryforward) | ₩	3,050
Others | ₩	0
Balance Ending | ₩	₩ 8,529	₩ 0
3rd planned period [Member] | Period 2024 [Member]
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Line Items]
Quantity Beginning | kT	5,261
Purchase (sell) | kT	(75)
Government submission | kT	0
Borrowing (carryforward) | kT	0
Others | kT	0
Quantity Ending | kT	5,186	5,261
Balance Beginning | ₩	₩ 0
Purchase (sell) | ₩	0
Government submission | ₩	0
Borrowing (carryforward) | ₩	0
Others | ₩	0
Balance Ending | ₩	₩ 0	₩ 0
3rd planned period [Member] | Period 2025 [Member]
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Line Items]
Quantity Beginning | kT	5,261
Purchase (sell) | kT	(50)
Government submission | kT	0
Borrowing (carryforward) | kT	0
Others | kT	0
Quantity Ending | kT	5,211	5,261
Balance Beginning | ₩	₩ 0
Purchase (sell) | ₩	6,873
Government submission | ₩	0
Borrowing (carryforward) | ₩	0
Others | ₩	0
Balance Ending | ₩	₩ 6,873	₩ 0

Provisions - Summary of Chang_2

Provisions - Summary of Changes in greenhouse gas emissions rights (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2021kT
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Abstract]
Estimated greenhouse gas emission	17,618

Government Grants - Summary of

Government Grants - Summary of Changes in Government Grants (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Changes in government grants
Beginning balance	₩ (511,210)	₩ (506,176)
Receipt	(37,920)	(41,209)
Acquisitions	5,001	8,783
Offset the items of depreciation expense and others	34,482	36,213
Disposals	2,343	2,534
Others	(5,443)	(11,355)
Ending balance	(512,747)	(511,210)
Cash
Changes in government grants
Beginning balance	0	0
Receipt	(37,920)	(41,209)
Acquisitions	0	0
Offset the items of depreciation expense and others	0	0
Disposals	0	0
Others	37,920	41,209
Ending balance	0	0
Land
Changes in government grants
Beginning balance	(23,475)	(21,817)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	0	0
Disposals	1	2
Others	0	(1,660)
Ending balance	(23,474)	(23,475)
Buildings
Changes in government grants
Beginning balance	(57,231)	(61,920)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	5,174	5,206
Disposals	0	0
Others	(65)	(517)
Ending balance	(52,122)	(57,231)
Structures
Changes in government grants
Beginning balance	(180,009)	(186,554)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	9,517	9,526
Disposals	1,811	2,032
Others	(3,340)	(5,013)
Ending balance	(172,021)	(180,009)
Machinery
Changes in government grants
Beginning balance	(157,785)	(158,907)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	17,519	17,468
Disposals	531	496
Others	(347)	(16,842)
Ending balance	(140,082)	(157,785)
Vehicles
Changes in government grants
Beginning balance	(632)	(2,275)
Receipt	0	0
Acquisitions	(26)	0
Offset the items of depreciation expense and others	460	2,064
Disposals	0	4
Others	(1,477)	(425)
Ending balance	(1,675)	(632)
Equipment
Changes in government grants
Beginning balance	(227)	(241)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	95	149
Disposals	0	0
Others	(17)	(135)
Ending balance	(149)	(227)
Construction in progress
Changes in government grants
Beginning balance	(79,126)	(61,211)
Receipt	0	0
Acquisitions	5,027	8,783
Offset the items of depreciation expense and others	0	0
Disposals	0	0
Others	(37,723)	(26,698)
Ending balance	(111,822)	(79,126)
Investment properties
Changes in government grants
Beginning balance	(29)	(13)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	1	1
Disposals	0	0
Others	(2)	(17)
Ending balance	(30)	(29)
Software
Changes in government grants
Beginning balance	(136)	(235)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	64	99
Disposals	0	0
Others	(19)	0
Ending balance	(91)	(136)
Development expenditures
Changes in government grants
Beginning balance	(5,043)	(1,492)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	1,439	1,453
Disposals	0	0
Others	(216)	(5,004)
Ending balance	(3,820)	(5,043)
Intangible assets under development
Changes in government grants
Beginning balance	(7,203)	(11,029)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	0	0
Disposals	0	0
Others	(123)	3,826
Ending balance	(7,326)	(7,203)
Others
Changes in government grants
Beginning balance	(75)	(79)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	4	4
Disposals	0	0
Others	0	0
Ending balance	(71)	(75)
Tools
Changes in government grants
Beginning balance	(239)	(403)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	209	243
Disposals	0	0
Others	(34)	(79)
Ending balance	₩ (64)	₩ (239)

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, 2021	Dec. 31, 2020
Disclosure of Detailed Information About Changes in Government Grants for Specific Business Projects [Line Items]
Beginning balance	₩ 511,210	₩ 506,176
Ending Balance	₩ 512,747	₩ 511,210
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
Project	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	2020.04.01 ~ 2020.12.31
Budget	₩ 211,235	₩ 72,662
Beginning balance	748	0
Self- payment, Contribution	0	0
Local government, Contribution	0	0
Government subsidies, Contribution	139,550	72,662
Self-payment, Interests	0	0
Local government, Interests	0	0
Government subsidies, Interests	0	16
Self- payment, Execution	0	0
Local government, Execution	0	0
Government subsidies, Execution	(122,563)	(71,914)
Self- payment, Return	0	0
Local government, Return	0	0
Government subsidies, Return	0	(16)
Others	0	0
Ending Balance	17,735	₩ 748
Energy Voucher
Disclosure of Detailed Information About Changes in Government Grants for Specific Business Projects [Line Items]
Project		Energy Voucher
Description		2020 Energy Voucher Support
Period		2020.01.01 ~ 2020.12.31
Budget		₩ 46,148
Beginning balance	₩ 0	0
Self- payment, Contribution		0
Local government, Contribution		0
Government subsidies, Contribution		46,148
Self-payment, Interests		0
Local government, Interests		0
Government subsidies, Interests		2
Self- payment, Execution		0
Local government, Execution		0
Government subsidies, Execution		(46,148)
Self- payment, Return		0
Local government, Return		0
Government subsidies, Return		(2)
Others		0
Ending Balance		₩ 0

Deferred Revenues (Details)

Deferred Revenues (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Deferred income including contract liabilities [abstract]
Deferred Revenue, Beginning Balance	₩ 9,868,189	₩ 9,201,538
Increase	1,149,578	1,310,128
Recognized as revenue	(661,212)	(643,477)
Deferred Revenue, Ending Balance	₩ 10,356,555	₩ 9,868,189

Non-financial Liabilities (Deta

Non-financial Liabilities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure - Other liabilities [Line Items]
Deferred revenue	₩ 10,356,555	₩ 9,868,189	₩ 9,201,538
Current
Disclosure - Other liabilities [Line Items]
Advances received, representing contract liabilities for performance obligations satisfied at point in time	4,157,916	3,693,043
Unearned revenue	40,187	35,068
Deferred revenue	659,397	625,596
Withholdings	345,892	257,059
Others	1,262,941	1,360,684
Total	6,466,333	5,971,450
Non-current
Disclosure - Other liabilities [Line Items]
Advances received, representing contract liabilities for performance obligations satisfied at point in time	398,056	331,596
Unearned revenue	6,517	6,122
Deferred revenue	9,697,158	9,242,593
Withholdings	5,171	9,909
Others	109,462	71,721
Total	₩ 10,216,364	₩ 9,661,941

Contributed Capital - Summary o

Contributed Capital - Summary of Details Shares Issued (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2021	Dec. 31, 2020
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, 2021	Dec. 31, 2020
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, 2021	Dec. 31, 2020	Dec. 31, 2019
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	641,964,077

Contributed Capital - Summary_4

Contributed Capital - Summary of Share Premium (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2021	Dec. 31, 2020
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, 2021	Dec. 31, 2020
Retained earnings [abstract]
Legal reserves	₩ 1,604,910	₩ 1,604,910
Voluntary reserves
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	26,361,617
Reserve for equalizing dividends	210,000	210,000
Voluntary reserves	33,282,817	32,179,066
Retained earnings before appropriations	10,359,255	17,349,625
Retained earnings	₩ 45,246,982	₩ 51,133,601

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, 2021	Dec. 31, 2020	Dec. 31, 2019
Beginning balance	₩ 51,133,601
Profit (loss), attributable to owners of the Controlling Company	(5,315,055)	₩ 1,991,347	₩ (2,345,517)
Changes in equity method retained earnings
Changes	494,584	281,107	214,138
Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans	210,409	(69,804)	42,315
Ending balance	45,246,982	51,133,601
Equity attributable to owners of parent [member]
Changes in equity method retained earnings
Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans	201,067	(62,857)	36,160
Retained earnings [member]
Beginning balance	51,133,601	49,202,133
Profit (loss), attributable to owners of the Controlling Company	(5,315,055)	1,991,347
Changes in equity method retained earnings
Beginning balance	361	(2,820)
Changes	3,609	3,181
Ending balance	3,970	361	(2,820)
Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans	201,067	(62,857)	36,160
Transfer of gain (loss) on valuation of financial assets at FVOCI	4,388	0
Dividend paid	(780,628)	0
Transactions between consolidated entities	0	(203)
Ending balance	₩ 45,246,982	₩ 51,133,601	₩ 49,202,133

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, 2021	Dec. 31, 2020	Dec. 31, 2019
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)	₩ 1,216	₩ 0	₩ 0
Dividends paid, ordinary shares	₩ 780,628	₩ 0	₩ 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, 2021	Dec. 31, 2020	Dec. 31, 2019
Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans [abstract]
Beginning balance	₩ (169,234)	₩ (117,779)
Changes	327,957	(77,828)
Income tax effect	(126,890)	14,971	₩ (40,235)
Transfer to reserve for business expansion	67,011	11,402
Ending balance	₩ 98,844	₩ (169,234)	₩ (117,779)

Statements of Appropriation o_3

Statements of Appropriation of Retained Earnings (Disposition of Deficit) (Details) - KRW (₩) ₩ / shares in Units, ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Appropriation of Retained Earnings [Line Items]
Unappropriated retained earnings (deficit) carried over from prior years	₩ 17,349,625
Profit (loss)	(5,229,225)	₩ 2,092,469	₩ (2,263,535)
Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans	₩ 210,409	₩ (69,804)	₩ 42,315
Dividend percentage	0.00%	24.32%
Dividends proposed or declared before financial statements authorised for issue but not recognised as distribution to owners per share	₩ 0	₩ 1,216
Separate [member]
Statement of Appropriation of Retained Earnings [Line Items]
Unappropriated retained earnings (deficit) carried over from prior years	₩ 0	₩ 0
Profit (loss)	(5,607,732)	1,951,498
Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans	107,884	(67,118)
Retained earnings before appropriations	(5,499,848)	1,884,380
Transfer from voluntary reserves	5,499,848	0
Subtotal (I+II)	0	1,884,380
Dividends (government, individual)(Amount of dividends per share (%) : Current year – ￦ 0 (0%), Prior year – ￦ 1,216 (24.32%))	0	(780,628)
Reserve for business expansion	0	(1,103,752)
Appropriations of retained earnings	0	(1,884,380)
Unappropriated retained earnings to be carried over forward to subsequent year	₩ 0	₩ 0

Hybrid bond (Details)

Hybrid bond (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Hybrid Bond [Line Items]
Amount	₩ 398,910	₩ 398,910
Korea South-East Power Co., Ltd. | 1st bond-type hybrid bond
Hybrid Bond [Line Items]
Issue date	Dec. 7, 2012
Maturity date	Dec. 6, 2042
Yield (%)	4.38%
Amount	₩ 170,000	170,000
Korea South-East Power Co., Ltd. | 2nd bond-type hybrid bond
Hybrid Bond [Line Items]
Issue date	Dec. 7, 2012
Maturity date	Dec. 6, 2042
Yield (%)	4.44%
Amount	₩ 230,000	230,000
Expense of issuance
Hybrid Bond [Line Items]
Amount	₩ (1,090)	₩ (1,090)

Other Components of Equity - Su

Other Components of Equity - Summary of Other Components of Equity (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Beginning balance	₩ 70,666,846	₩ 68,889,649	₩ 71,092,762
Issuance of share capital of subsidiary	75,211	(5,445)	21,071
Others	(34,747)	(1,274)	(8,137)
Changes in the unrealized fair value of financial assets at FVOCI, net of tax	59,024	(8,532)	(11,732)
Shares in other comprehensive Income(loss) of associates and joint ventures, net of tax	3,609	3,181	(6,789)
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	301,161	(132,805)	19,344
Foreign currency translation of foreign operations, net of tax	41,189	(76,442)	72,816
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax	(15,778)	64,561	19,242
Ending balance	65,311,849	70,666,846	68,889,649
Other Components Of Equity
Beginning balance	14,109,501
Ending balance	14,468,450	14,109,501
Other capital surplus
Beginning balance	1,224,105	1,226,364
Changes in consolidation scope	43	0
Issuance of share capital of subsidiary	(491)	(148)
Others	7,452	(2,111)
Ending balance	1,231,109	1,224,105	1,226,364
Other capital surplus | Other Components Of Equity
Beginning balance	1,224,105
Ending balance	1,231,109	1,224,105
Gains on disposal of Treasury stocks
Beginning balance	387,524	387,524
Changes in consolidation scope	0	0
Issuance of share capital of subsidiary	0	0
Others	0	0
Ending balance	387,524	387,524	387,524
Other Capital Surplus Other Than Gainson Disposal Of Treasury Stocks
Beginning balance	836,581	838,840
Changes in consolidation scope	43	0
Issuance of share capital of subsidiary	(491)	(148)
Others	7,452	(2,111)
Ending balance	843,585	836,581	838,840
Accumulated other comprehensive loss
Beginning balance	(409,577)	(280,730)
Changes in the unrealized fair value of financial assets at FVOCI, net of tax	59,022	(8,533)
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	301,161	(132,805)
Foreign currency translation of foreign operations, net of tax	15,760	(46,032)
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax	(19,610)	58,523
Others	(4,388)
Ending balance	(57,632)	(409,577)	(280,730)
Accumulated other comprehensive loss | Other Components Of Equity
Beginning balance	(409,577)
Ending balance	(57,632)	(409,577)
Financial assets at fair value through other comprehensive income
Beginning balance	(101,132)	(92,599)
Changes in the unrealized fair value of financial assets at FVOCI, net of tax	59,022	(8,533)
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	(46,498)	(101,132)	(92,599)
Shares in other comprehensive Income (loss) of investments in associates and joint ventures
Beginning balance	10,091	142,896
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	301,161	(132,805)
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	311,252	10,091	142,896
Reserve for gain (loss) on valuation of derivatives
Beginning balance	22,394	(36,129)
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	(19,610)	58,523
Others	0
Ending balance	2,784	22,394	(36,129)
Reserve for overseas operations translation credit
Beginning balance	(340,930)	(294,898)
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	15,760	(46,032)
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax	0	0
Others	0
Ending balance	(325,170)	(340,930)	₩ (294,898)
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, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of performance obligations [line items]
Sales of goods		₩ 58,702,209	₩ 56,684,312	₩ 56,894,876
Sales related to rendering of services		456,400	429,350	408,290
Sales of construction services		754,998	812,175	1,264,916
Total revenue from external customers (Notes 4, 35, 45, 47)		59,913,607	57,925,837	58,568,082
Domestic
Disclosure of performance obligations [line items]
Sales of goods		58,261,006	56,380,608	56,609,330
Sales related to rendering of services		252,216	223,075	222,106
Sales of construction services		159,262	170,895	110,692
Total revenue from external customers (Notes 4, 35, 45, 47)		58,672,484	56,774,578	56,942,128
Domestic | Electricity
Disclosure of performance obligations [line items]
Sales of goods		57,210,231	55,730,985	55,939,001
Domestic | Heat Supply
Disclosure of performance obligations [line items]
Sales of goods		232,294	198,715	220,948
Domestic | Others
Disclosure of performance obligations [line items]
Sales of goods		818,481	450,908	449,381
Domestic | Performance obligations satisfied at point in time
Disclosure of performance obligations [line items]
Total revenue from external customers (Notes 4, 35, 45, 47)		58,261,006	56,380,608	56,609,330
Domestic | Performance obligations satisfied over time
Disclosure of performance obligations [line items]
Total revenue from external customers (Notes 4, 35, 45, 47)		411,478	393,970	332,798
Overseas
Disclosure of performance obligations [line items]
Sales of goods		441,203	303,704	285,546
Sales related to rendering of services		204,184	206,275	186,184
Sales of construction services		595,736	641,280	1,154,224
Total revenue from external customers (Notes 4, 35, 45, 47)	[1]	1,241,123	1,151,259	1,625,954
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		441,203	303,704	285,546
Overseas | Performance obligations satisfied at point in time
Disclosure of performance obligations [line items]
Total revenue from external customers (Notes 4, 35, 45, 47)		441,203	303,704	285,546
Overseas | Performance obligations satisfied over time
Disclosure of performance obligations [line items]
Total revenue from external customers (Notes 4, 35, 45, 47)		₩ 799,920	₩ 847,555	₩ 1,340,408
[1]	Middle East and other Asian countries make up the majority of overseas revenue and non-current assets. Since the overseas revenue or non-current assets attributable to particular countries are not material, they are not disclosed individually.

Selling and Administrative Ex_3

Selling and Administrative Expenses - Summary of Selling and Administrative Expenses (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of attribution of expenses by nature to their function [line items]
Salaries	₩ 5,394,159	₩ 5,278,637	₩ 4,609,976
Retirement benefits expense	600,961	561,996	809,739
Welfare and benefit expense	725,700	639,390	563,945
Insurance expense	122,453	103,308	106,129
Depreciation	11,767,104	11,369,496	10,966,756
Amortization of intangible assets	166,161	170,466	156,915
Bad debt expense	17,968	20,648	(12,719)
Commission	717,486	744,322	1,011,710
Advertising expense	38,782	37,720	44,305
Training expense	18,199	18,108	24,077
Vehicle maintenance expense	17,001	16,596	17,177
Publishing expense	6,868	7,201	6,837
Business promotion expense	7,299	7,334	7,019
Rent expense	237,120	227,410	216,918
Telecommunication expense	19,528	18,647	19,485
Transportation expense	54,235	11,369	5,420
Taxes and dues	622,629	555,031	540,350
Expendable supplies expense	50,419	44,995	39,681
Water, light and heating expense	55,285	42,958	44,245
Repairs and maintenance expense	2,615,164	2,544,901	2,298,854
Ordinary development expense	689,397	700,642	735,715
Travel expense	78,185	71,689	84,233
Clothing expense	18,534	22,950	16,908
Survey and analysis expense	4,844	4,572	4,797
Membership fee	9,823	14,404	13,699
Disclosure - Other selling and administrative expenses
General and administrative expenses	2,875,784	2,678,443	2,669,576
Selling and administrative expense
Disclosure of attribution of expenses by nature to their function [line items]
Salaries	1,121,188	1,095,183	775,204
Retirement benefits expense	113,127	103,967	157,272
Welfare and benefit expense	155,558	155,071	120,463
Insurance expense	17,909	10,178	12,427
Depreciation	219,427	218,103	232,510
Amortization of intangible assets	91,428	87,086	76,547
Bad debt expense	17,968	20,648	(12,719)
Commission	410,275	368,275	632,849
Advertising expense	29,230	29,559	34,453
Training expense	4,923	5,196	7,174
Vehicle maintenance expense	8,849	9,435	9,525
Publishing expense	3,568	3,677	3,414
Business promotion expense	3,522	3,614	3,038
Rent expense	43,650	36,337	40,505
Telecommunication expense	8,569	8,686	8,451
Transportation expense	870	1,007	865
Taxes and dues	93,446	62,828	58,666
Expendable supplies expense	9,052	8,029	6,682
Water, light and heating expense	12,351	11,749	11,867
Repairs and maintenance expense	123,134	79,185	88,576
Ordinary development expense	213,936	197,436	224,463
Travel expense	11,099	10,793	15,652
Clothing expense	10,540	14,834	9,369
Survey and analysis expense	889	826	848
Membership fee	1,331	1,274	969
Disclosure - Other selling and administrative expenses
Accommodation development expenses	57,815	30,889	53,945
Miscellaneous wages	47,221	45,887	39,794
Litigation and filing expenses	16,383	19,341	21,768
Compensation for damages	3,303	8,374	(1,924)
Outsourcing expenses	3,799	3,610	3,293
Reward expenses	3,006	3,228	2,858
Overseas market development expenses	1,192	1,218	1,997
Others	17,226	22,920	28,775
Others	149,945	135,467	150,506
General and administrative expenses	₩ 2,875,784	₩ 2,678,443	₩ 2,669,576

Other Income and Expense (Detai

Other Income and Expense (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other non-operating income [Abstract]
Reversal of other provisions	₩ 15,548	₩ 25,826	₩ 16,542
Reversal of allowance for doubtful accounts	98	2,465	0
Gains on government grants	458	269	281
Gains on assets contributed	9,347	24,324	6,921
Gains on liabilities exempted	1,830	1,314	916
Compensation and reparations revenue	104,826	95,407	113,292
Revenue from foundation fund	1
Revenue from research contracts	5,996	4,001	5,276
Income related to transfer of assets from customers	661,212	643,477	604,808
Rental income	204,123	193,567	191,088
Others of Other Income	30,694	45,798	58,849
Refund of claim for rectification	7,274	11,880	1,969
Adjustment of research project	7,638	2,150	3,294
Maintenance expenses on lease building	160	2,785	153
Training expenses	1,739	3,852	3,167
Deposit redemption	378	314	436
Reversal of expenses on litigation	991	620	9,926
Revenue on royalty fee	173	0	0
Reimbursement of insurance fee	1	22	610
Gains on guarantee contracts	27	134	135
Miscellaneous other non-operating income	12,313	24,041	39,159
Other nonoperating income	1,034,133	1,036,448	997,973
Other non-operating expense
Compensation and indemnification expense	663	11,959	403
Accretion expenses of other provisions	2,711	17,991	7,939
Depreciation expenses on investment properties	1,386	1,453	5,069
Depreciation expenses on idle assets	3,621	6,604	6,542
Other bad debt expense	49,372	32,503	29,348
Donations	152,456	316,981	64,752
Others of Other Expense	47,723	30,229	127,860
Operating expenses related to the idle assets	44	46	49
Research grants	109	91	399
Expenses related to farming and fishing village supports	17,065	16,115	13,991
Expenses related to Operating of a fitness center	6,948	5,101	5,234
Expenses on adjustment of research and development grants	2,241	720	554
Taxes and dues	119	253	188
Expenses on R&D supports	861	242	67
Miscellaneous other non-operating expense	20,336	7,661	107,378
Other Nonoperating Expense	₩ 257,932	₩ 417,720	₩ 241,913

Other Gains (Losses) (Details)

Other Gains (Losses) (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other gains
Gains on disposal of property, plant and equipment	₩ 56,284	₩ 93,195	₩ 43,784
Gains on disposal of inventories	4,446	3,373	3,424
Gains on disposal of intangible assets	1	1,556	206
Reversal of impairment loss on property, plant and equipment	0	7,805	16,692
Reversal of impairment loss on intangible assets	14	0	0
Gains on proxy collection of TV license fee	42,271	41,438	41,013
Gains on foreign currency translation	20,598	8,917	16,340
Gains on foreign currency transaction	48,671	61,865	53,152
Gains on insurance proceeds	144	43,800	17,410
Miscellaneous Other Gains	250,174	322,379	238,688
Gains on compensation of impaired electric poles	812	978	1,372
Gains on harbor facilities dues	3,281	2,231	3,741
Gains on technical fees	3,968	4,826	3,044
Reversal of occupation development training fees	229	352	1,472
Gains on disposal of waste	4,272	6,927	5,317
Gains on insurance	690	0	812
Gains on tax rebate	685	772	341
Gains on other commission	1,822	1,643	1,111
Gains on disposal of assets held-for-sale	160	0	23,778
Others of Miscellaneous Other Gains	178,799	259,839	153,263
Gains on disposal of greenhouse gas emissions rights	8,739	0	0
Other losses
Losses on disposal of property, plant and equipment	(92,622)	(162,725)	(72,508)
Losses on disposal of intangible assets	(145)	(392)	(827)
Losses on valuation of other non-current assets	0	(241)	0
Impairment loss on property, plant and equipment	(4,056)	(80,413)	(50,034)
Impairment loss on intangible assets	0	(3,599)	(513,609)
Impairment loss on other non-current assets	(16,035)	0	(49,620)
Losses on foreign currency translation	(4,732)	(17,664)	(8,757)
Losses on foreign currency transaction	(67,990)	(49,694)	(55,283)
Miscellaneous Other Losses	(181,787)	(189,695)	(217,892)
Losses on valuation of inventories	7,761	4,998	3,127
Losses on disposal of inventories	8,874	37,644	10,456
Losses due to disaster	6,238	16,814	7,635
Losses on rounding adjustment of electric charge surtax	1,283	1,276	1,268
Others of miscellaneous other losses	146,349	128,963	195,406
Loss on disposal of greenhouse gas emissions rights	11,282
Total miscellaneous other losses	181,787	189,695	217,892
Net other gains	₩ 8,519	₩ 35,094	₩ (582,258)

Finance Income - Summary of Fin

Finance Income - Summary of Finance Income and Interest Income (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Interest Income
Cash and cash equivalents	₩ 12,692	₩ 9,419	₩ 42,861
Financial assets at fair value through profit or loss	18,415	19,114	29,411
Financial assets at amortized cost	797	612	539
Loans	25,196	26,232	63,448
Short-term financial instruments	7,531	25,540	49,070
Long-term financial instruments	12,470	10,406	12,794
Other financial assets	230	228	54
Trade and other receivables	144,543	151,035	69,941
Total Interest Income	221,874	242,586	268,118
Dividend income	10,522	7,316	13,838
Gains on disposal of financial assets	7,718	11,992	3,866
Gains on valuation of financial assets at fair value through profit or loss	14,338	12,904	5,575
Gains on valuation of derivatives	860,011	57,563	362,735
Gains on transaction of derivatives	124,900	146,448	157,961
Gains on foreign currency translation	146,349	1,005,961	175,839
Gains on foreign currency transactions	15,618	24,009	21,774
Other financial income	1,284	1,470	0
Total Finance Income	₩ 1,402,614	₩ 1,510,249	₩ 1,009,706

Finance Expenses - Summary of F

Finance Expenses - Summary of Finance Expenses and Interest Expense (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Interest costs [abstract]
Trade and other payables	₩ 213,765	₩ 88,757	₩ 94,019
Short-term borrowings	42,371	29,358	42,971
Long-term borrowings	115,141	118,678	119,806
Debt securities	1,728,588	1,805,253	1,827,511
Other financial liabilities	384,423	540,867	558,464
Interest expense (before capitalizing borrowing costs)	2,484,288	2,582,913	2,642,771
Less: Capitalized borrowing costs	(569,831)	(587,488)	(595,960)
Interest expense	1,914,457	1,995,425	2,046,811
Losses on sale of financial assets	1,045	648	2,106
Losses on valuation of financial assets at fair value through profit or loss	5,480	7,396	4,513
Losses on valuation of derivatives	37,017	513,278	45,385
Losses on transaction of derivatives	40,818	81,055	71,546
Losses on foreign currency translation	83,558	215,047	553,731
Losses on foreign currency transaction	1,159,334	79,103	55,509
Losses on repayment of financial liabilities	10	35	0
Others	4,058	4,456	2,555
Total Finance Expense	₩ 3,245,777	₩ 2,896,443	₩ 2,782,156

Finance Expenses - Additional I

Finance Expenses - Additional Information (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Minimum
Borrowing costs [abstract]
Capitalization rates	2.02%	2.14%	2.37%
Maximum
Borrowing costs [abstract]
Capitalization rates	4.33%	4.84%	3.44%

Income Taxes - Summary of Incom

Income Taxes - Summary of Income Tax Expense (Benefit) (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income tax expense (benefit) [Abstract]
Payment of income tax	₩ 357,767	₩ 671,179	₩ 538,223
Adjustment in respect of prior years due to change in estimate	153,113	(63,756)	(176,441)
Current income tax directly recognized in equity	(198,714)	51,486	(53,302)
Current income tax expense	312,166	658,909	308,480
Changes of unrecognized tax losses, tax credit and temporary differences for prior periods	(2,168,155)	240,155	(1,310,783)
Generation and realization of temporary differences	(489,411)	(77,985)	(636,984)
Changes of unrecognized tax losses, tax credit and temporary differences for prior periods	(43,653)	(10,471)	(22,469)
Changes in deferred tax on tax losses carryforwards	(1,641,823)	296,070	(582,011)
Tax credit carryforwards	(12,199)	32,541	(71,306)
Amount due to change in tax rate or regulations	18,931	0	1,987
Income tax expense (benefit)	(1,855,989)	899,064	(1,002,303)
Dividends of hybrid bond and others	4,736	4,273	3,432
Income tax recognized as other comprehensive income (loss)	(203,450)	47,213	(56,733)
Gain(loss) on valuation of financial assets at fair value through other comprehensive income	(9,753)	19,447	(4,217)
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax	24,220	(47,231)	(15,642)
Remeasurements of defined benefit liability	(126,890)	14,971	(40,235)
Investments in associates	(53,672)	35,714	4,275
Others	₩ (37,355)	₩ 24,312	₩ (914)

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, 2021		Dec. 31, 2020	Dec. 31, 2019
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]
Profit (loss) before income tax		₩ (7,085,214)		₩ 2,991,533	₩ (3,265,838)
Income tax expense (benefit) computed at applicable tax rate	[1]	(1,948,434)		822,672	(898,105)
Adjustments		(60,668)		140,148	72,243
Effect of applying gradual tax rate		(10,362)		(10,362)	10,362
Effect of non-taxable income		(4,983)		(13,593)	(9,990)
Effect of non-deductible expenses		78,814		46,776	12,197
Effect of tax losses that are not recognized as deferred tax asset		1,351		0	57,490
Effects of tax credits and deduction		(43,931)		(63,753)	(76,983)
Effect of change in deferred tax due to change in tax rate		18,931		(17,590)	16,848
Reversal of unrecognized deferred tax asset, net		(43,641)		(10,471)	(22,469)
Deduction of deferred tax assets		73,887		55,682	0
Deferred tax related to investments in subsidiaries, associates and joint ventures		(135,878)		102,137	147,598
Others, net		5,144		51,322	(62,810)
Adjustment in respect of prior years due to change in estimate		153,113		(63,756)	(176,441)
Income tax expense (benefit)		₩ (1,855,989)		₩ 899,064	₩ (1,002,303)
Effective tax rate			[2]	30.05%		[2]
[1]	Applicable tax rate is 27.5% as of December 31, 2019, 2020 and 2021.
[2]	The effective tax rate for the year ended December 31, 2019 and 2021 is not calculated due to income tax benefit and 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, 2021		Dec. 31, 2020	Dec. 31, 2019
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]
Applicable tax rate	27.50%		27.50%	27.50%
Effective tax rate		[1]	30.05%		[1]
[1]	The effective tax rate for the year ended December 31, 2019 and 2021 is not calculated due to income tax benefit and 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, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	₩ (7,367,101)	₩ (7,126,946)
Amounts recognized in profit or loss	2,366,869	(291,641)
Amount recognized in other comprehensive income (loss)	(203,450)	47,213	₩ (56,733)
Amounts recognized directly in equity	4,736	4,273
Ending balance	(5,198,946)	(7,367,101)	(7,126,946)
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	(8,400,772)	(8,382,980)
Amounts recognized in profit or loss	636,788	(69,278)
Amount recognized in other comprehensive income (loss)	(203,450)	47,213
Amounts recognized directly in equity	4,736	4,273
Ending balance	(7,962,698)	(8,400,772)	(8,382,980)
Employee benefits
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	689,787	648,847
Amounts recognized in profit or loss	(4,514)	14,566
Amount recognized in other comprehensive income (loss)	(126,890)	26,374
Ending balance	558,383	689,787	648,847
Cash flow hedges
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	15,587	(999)
Amounts recognized in profit or loss	(90,217)	63,817
Amount recognized in other comprehensive income (loss)	24,220	(47,231)
Amounts recognized directly in equity	463
Ending balance	(49,947)	15,587	(999)
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	(8,668,015)	(8,665,727)
Amounts recognized in profit or loss	367	(38,002)
Amount recognized in other comprehensive income (loss)	(53,672)	35,714
Ending balance	(8,721,320)	(8,668,015)	(8,665,727)
Property, plant and equipment
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	(7,713,449)	(7,115,218)
Amounts recognized in profit or loss	282,988	(598,231)
Ending balance	(7,430,461)	(7,713,449)	(7,115,218)
Finance lease
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	(211,420)	(160,443)
Amounts recognized in profit or loss	(204,138)	(50,977)
Ending balance	(415,558)	(211,420)	(160,443)
Intangible Assets
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	(31,166)	(55,906)
Amounts recognized in profit or loss	(315)	24,740
Ending balance	(31,481)	(31,166)	(55,906)
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	13	341
Amounts recognized in profit or loss	(1)	(328)
Ending balance	12	13	341
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	37,950	18,245
Amounts recognized in profit or loss	(816)	258
Amount recognized in other comprehensive income (loss)	(9,753)	19,447
Ending balance	27,381	37,950	18,245
Deferred revenue
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	199,701	213,003
Amounts recognized in profit or loss	(13,310)	(13,302)
Ending balance	186,391	199,701	213,003
Provisions
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	5,916,803	5,456,919
Amounts recognized in profit or loss	577,511	459,884
Ending balance	6,494,314	5,916,803	5,456,919
Doubtful receivables
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	0	59
Amounts recognized in profit or loss	801	(59)
Ending balance	801	0	59
Other financial liabilities
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	30,399	39,364
Amounts recognized in profit or loss	(3,262)	(13,238)
Amounts recognized directly in equity	4,273	4,273
Ending balance	31,410	30,399	39,364
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	(11,635)	57,961
Amounts recognized in profit or loss	103,046	(69,596)
Ending balance	91,411	(11,635)	57,961
Allowance for doubtful accounts
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	56,129	57,607
Amounts recognized in profit or loss	8,135	(1,478)
Ending balance	64,264	56,129	57,607
Accrued income
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	8,944	(4,376)
Amounts recognized in profit or loss	1,058	13,320
Ending balance	10,002	8,944	(4,376)
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	(226,351)	(215,373)
Amounts recognized in profit or loss	2,224	(10,978)
Ending balance	(224,127)	(226,351)	(215,373)
Others
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	1,505,951	1,342,716
Amounts recognized in profit or loss	(22,769)	150,326
Amount recognized in other comprehensive income (loss)	(37,355)	12,909
Ending balance	1,445,827	1,505,951	1,342,716
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	1,033,671	1,256,034
Amounts recognized in profit or loss	1,730,081	(222,363)
Ending balance	2,763,752	1,033,671	1,256,034
Unused tax losses
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	893,074	1,111,813
Amounts recognized in profit or loss	1,666,803	(218,739)
Ending balance	2,559,877	893,074	1,111,813
Excess of donation limit
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	35,181	36,695
Amounts recognized in profit or loss	34,004	(1,514)
Ending balance	69,185	35,181	36,695
Tax credit
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance	105,416	107,526
Amounts recognized in profit or loss	29,274	(2,110)
Ending balance	₩ 134,690	₩ 105,416	₩ 107,526

Income Taxes - Summary of Defer

Income Taxes - Summary of Deferred Income Tax Assets (Liabilities) (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets and liabilities [abstract]
Deferred tax assets	₩ 1,901,992	₩ 1,733,146
Deferred tax liabilities	(7,100,938)	(9,100,247)
Net Deferred tax assets(liabilities)	₩ (5,198,946)	₩ (7,367,101)	₩ (7,126,946)

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, 2021	Dec. 31, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [abstract]
Deductible temporary differences	₩ 1,539,980	₩ 1,405,621

Assets Held-for-Sale (Details)

Assets Held-for-Sale (Details) - Non-current assets held for sale - KRW (₩) ₩ in Millions		Dec. 31, 2021	Dec. 31, 2020
Assets Held for Sale [Line Items]
Assets Held-for-Sale		₩ 15,879	₩ 925
Land
Assets Held for Sale [Line Items]
Assets Held-for-Sale	[1]	2,907	0
Buildings
Assets Held for Sale [Line Items]
Assets Held-for-Sale	[1]	12,971	1
Investments
Assets Held for Sale [Line Items]
Assets Held-for-Sale	[1]	1	0
Others
Assets Held for Sale [Line Items]
Assets Held-for-Sale	[2]	₩ 0	₩ 924
[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, 2021, 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 Company had decided to sell its shares of DG Fairhaven Power, LLC, a subsidiary of the Company, and classified them as assets held-for-sale as of December 31, 2020. The disposal was completed during the year ended December 31, 2021.

Expenses Classified by Nature_2

Expenses Classified by Nature (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of attribution of expenses by nature to their function [line items]
Raw materials used	₩ 18,575,160	₩ 13,544,827	₩ 17,084,029
Salaries	5,394,159	5,278,637	4,609,976
Retirement benefits expense	600,961	561,996	809,739
Welfare and benefit expense	725,700	639,390	563,945
Insurance expense	122,453	103,308	106,129
Depreciation	11,767,104	11,369,496	10,966,756
Amortization of intangible assets	166,161	170,466	156,915
Bad debt expense	17,968	20,648	(12,719)
Commission	717,486	744,322	1,011,710
Advertising expense	38,782	37,720	44,305
Training expense	18,199	18,108	24,077
Vehicle maintenance expense	17,001	16,596	17,177
Publishing expense	6,868	7,201	6,837
Business promotion expense	7,299	7,334	7,019
Rent expense	237,120	227,410	216,918
Telecommunication expense	19,528	18,647	19,485
Transportation expense	54,235	11,369	5,420
Taxes and dues	622,629	555,031	540,350
Expendable supplies expense	50,419	44,995	39,681
Water, light and heating expense	55,285	42,958	44,245
Repairs and maintenance expense	2,615,164	2,544,901	2,298,854
Ordinary development expense	689,397	700,642	735,715
Travel expense	78,185	71,689	84,233
Clothing expense	18,534	22,950	16,908
Survey and analysis expense	4,844	4,572	4,797
Membership fee	9,823	14,404	13,699
Power purchase	21,632,127	15,725,220	18,269,732
Others	2,172,371	1,978,202	2,763,479
Total expenses, by nature	66,434,962	54,483,039	60,449,411
Selling and administrative expense
Disclosure of attribution of expenses by nature to their function [line items]
Raw materials used	0	0	0
Salaries	1,121,188	1,095,183	775,204
Retirement benefits expense	113,127	103,967	157,272
Welfare and benefit expense	155,558	155,071	120,463
Insurance expense	17,909	10,178	12,427
Depreciation	219,427	218,103	232,510
Amortization of intangible assets	91,428	87,086	76,547
Bad debt expense	17,968	20,648	(12,719)
Commission	410,275	368,275	632,849
Advertising expense	29,230	29,559	34,453
Training expense	4,923	5,196	7,174
Vehicle maintenance expense	8,849	9,435	9,525
Publishing expense	3,568	3,677	3,414
Business promotion expense	3,522	3,614	3,038
Rent expense	43,650	36,337	40,505
Telecommunication expense	8,569	8,686	8,451
Transportation expense	870	1,007	865
Taxes and dues	93,446	62,828	58,666
Expendable supplies expense	9,052	8,029	6,682
Water, light and heating expense	12,351	11,749	11,867
Repairs and maintenance expense	123,134	79,185	88,576
Ordinary development expense	213,936	197,436	224,463
Travel expense	11,099	10,793	15,652
Clothing expense	10,540	14,834	9,369
Survey and analysis expense	889	826	848
Membership fee	1,331	1,274	969
Power purchase	0	0	0
Others	149,945	135,467	150,506
Total expenses, by nature	2,875,784	2,678,443	2,669,576
Cost of sales
Disclosure of attribution of expenses by nature to their function [line items]
Raw materials used	18,575,160	13,544,827	17,084,029
Salaries	4,272,971	4,183,454	3,834,772
Retirement benefits expense	487,834	458,029	652,467
Welfare and benefit expense	570,142	484,319	443,482
Insurance expense	104,544	93,130	93,702
Depreciation	11,547,677	11,151,393	10,734,246
Amortization of intangible assets	74,733	83,380	80,368
Bad debt expense	0	0	0
Commission	307,211	376,047	378,861
Advertising expense	9,552	8,161	9,852
Training expense	13,276	12,912	16,903
Vehicle maintenance expense	8,152	7,161	7,652
Publishing expense	3,300	3,524	3,423
Business promotion expense	3,777	3,720	3,981
Rent expense	193,470	191,073	176,413
Telecommunication expense	10,959	9,961	11,034
Transportation expense	53,365	10,362	4,555
Taxes and dues	529,183	492,203	481,684
Expendable supplies expense	41,367	36,966	32,999
Water, light and heating expense	42,934	31,209	32,378
Repairs and maintenance expense	2,492,030	2,465,716	2,210,278
Ordinary development expense	475,461	503,206	511,252
Travel expense	67,086	60,896	68,581
Clothing expense	7,994	8,116	7,539
Survey and analysis expense	3,955	3,746	3,949
Membership fee	8,492	13,130	12,730
Power purchase	21,632,127	15,725,220	18,269,732
Others	2,022,426	1,842,735	2,612,973
Total expenses, by nature	₩ 63,559,178	₩ 51,804,596	₩ 57,779,835

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, 2021	Dec. 31, 2020	Dec. 31, 2019
Basic earnings per share [abstract]
Profit (loss) attributable to owners of the controlling company	₩ (5,315,055)	₩ 1,991,347	₩ (2,345,517)
Profit (loss) used in the calculation of total basic earnings (loss) per share	₩ (5,315,055)	₩ 1,991,347	₩ (2,345,517)
Weighted average number of common shares	641,964,077	641,964,077	641,964,077
Basic earnings (loss) per share	₩ (8,279)	₩ 3,102	₩ (3,654)

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, 2021	Dec. 31, 2020	Dec. 31, 2019
Diluted earnings per share [abstract]
Profit (loss) used in the calculation of total diluted earnings (loss) per share	₩ (5,315,055)	₩ 1,991,347	₩ (2,345,517)
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	₩ (8,279)	₩ 3,102	₩ (3,654)

Risk Management - Summary of Ca

Risk Management - Summary of Capital Risk Management (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of Capital risk management [Abstract]
Total borrowings and debt securities	₩ 80,529,513	₩ 69,724,581
Cash and cash equivalents	2,635,238	2,029,584	₩ 1,810,129	₩ 1,358,345
Net borrowings and debt securities	77,894,275	67,694,997
Total shareholders' equity	₩ 65,311,849	₩ 70,666,846	₩ 68,889,649	₩ 71,092,762
Debt to equity ratio	119.27%	95.79%

Risk Management - Summary of Ma

Risk Management - Summary of Maximum Exposure to Credit Risk (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2021	Dec. 31, 2020
Cash and Cash Equivalents
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk		₩ 2,635,238	₩ 2,029,584
Financial assets at fair value through profit or loss
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	[1]	932,736	1,808,404
Not Designated as Hedging Instrument
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk		443,027	110,764
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		491	0
Financial assets at amortized cost
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk		25,273	14,422
Loans and receivables
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk		909,071	790,162
Long-term/short-term financial instruments
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk		1,728,508	2,062,103
Designated as Hedging Instrument
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk		204,756	55,649
Trade and other receivables
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk		10,029,276	9,780,039
Financial guarantee contracts
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	[2]	₩ 3,718,015	₩ 3,224,696
[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, 2021	Dec. 31, 2020
Disclosure of sensitivity analysis for actuarial assumptions [line items]
1% Increase	₩ 25,649	₩ 20,960
1% Decrease	25,649	20,960
Actuarial assumption of expected rates of salary increases
Disclosure of sensitivity analysis for actuarial assumptions [line items]
1% Increase	466,832	488,087
1% Decrease	(407,554)	(425,708)
Actuarial assumption of discount rates
Disclosure of sensitivity analysis for actuarial assumptions [line items]
1% Increase	(422,290)	(443,527)
1% Decrease	₩ 499,571	₩ 524,856

Risk Management - Summary of Pr

Risk Management - Summary of Principal Assumptions on Provisions Valuation (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
PCBs
Disclosure of Principal assumptions on provisions valuation [Line Items]
Inflation rate	1.37%	1.06%
Discount rate	1.88%	1.83%
Nuclear plants
Disclosure of Principal assumptions on provisions valuation [Line Items]
Inflation rate	1.41%	1.07%
Discount rate	2.20%	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%

Risk Management - Summary of _2

Risk Management - Summary of Sensitivity Analysis for Provisions Assumptions (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
PCBs | Discount rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	₩ (222)	₩ (292)
0.1% Decrease	223	293
PCBs | Inflation rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	224	295
0.1% Decrease	(224)	(294)
Nuclear plants | Discount rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	(369,540)	(326,926)
0.1% Decrease	381,026	336,928
Nuclear plants | Inflation rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	403,420	357,676
0.1% Decrease	(391,754)	(347,450)
Spent fuel | Discount rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	(51,430)	(51,558)
0.1% Decrease	53,438	53,571
Spent fuel | Inflation rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	54,210	54,345
0.1% Decrease	₩ (52,245)	₩ (52,375)

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, 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

Dec. 31, 2021AED (د.إ)

Dec. 31, 2021AUD ($)

Dec. 31, 2021BDT (৳)

Dec. 31, 2021BWP (P)

Dec. 31, 2021EGP (ج.م.)

Dec. 31, 2021CAD ($)

Dec. 31, 2021CHF (SFr)

Dec. 31, 2021CZK (Kč)

Dec. 31, 2021EUR (€)

Dec. 31, 2021GBP (£)

Dec. 31, 2021HKD ($)

Dec. 31, 2021IDR (Rp)

Dec. 31, 2021INR (₨)

Dec. 31, 2021JOD (JD)

Dec. 31, 2021JPY (¥)

Dec. 31, 2021KZT (₸)

Dec. 31, 2021MGA (Ar)

Dec. 31, 2021MMK (K)

Dec. 31, 2021MYR (RM)

Dec. 31, 2021PHP (₱)

Dec. 31, 2021PKR (₨)

Dec. 31, 2021SAR (ر.س)

Dec. 31, 2021SEK (kr)

Dec. 31, 2021USD ($)

Dec. 31, 2021UYU ($)

Dec. 31, 2021VND (₫)

Dec. 31, 2021ZAR (R)

Dec. 31, 2020AED (د.إ)

Dec. 31, 2020AUD ($)

Dec. 31, 2020BDT (৳)

Dec. 31, 2020BWP (P)

Dec. 31, 2020EGP (ج.م.)

Dec. 31, 2020CAD ($)

Dec. 31, 2020CHF (SFr)

Dec. 31, 2020CZK (Kč)

Dec. 31, 2020EUR (€)

Dec. 31, 2020GBP (£)

Dec. 31, 2020HKD ($)

Dec. 31, 2020IDR (Rp)

Dec. 31, 2020INR (₨)

Dec. 31, 2020JOD (JD)

Dec. 31, 2020JPY (¥)

Dec. 31, 2020KZT (₸)

Dec. 31, 2020MGA (Ar)

Dec. 31, 2020MMK (K)

Dec. 31, 2020MYR (RM)

Dec. 31, 2020PHP (₱)

Dec. 31, 2020PKR (₨)

Dec. 31, 2020SAR (ر.س)

Dec. 31, 2020SEK (kr)

Dec. 31, 2020USD ($)

Dec. 31, 2020UYU ($)

Dec. 31, 2020VND (₫)

Dec. 31, 2020ZAR (R)

Disclosure of Foreign currency risk [Abstract]

Assets

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

ر.س 2,615

kr 0

$ 1,381,441

$ 90,930

₫ 952,135

R 31,971

د.إ 39,678

$ 133

৳ 93,442

P 890

ج.م. 0

$ 247

SFr 0

Kč 0

€ 310

£ 0

$ 0

Rp 342,496

₨ 1,231,895

JD 1,673

¥ 825,269

₸ 1,510

Ar 5,645,349

K 11,032

RM 0

₱ 191,122

₨ 371,328

ر.س 2,178

kr 0

$ 1,445,522

$ 78,265

₫ 672,563

R 303

Liabilities

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

ر.س 0

kr 449,167

$ 12,023,085

$ 3,097

₫ 262,372

R 0

د.إ 31,594

$ 707,538

৳ 0

P 0

ج.م. 948

$ 1,840

SFr 500,406

Kč 2,033

€ 121,069

£ 43

$ 1,651,839

Rp 555,241

₨ 155,134

JD 0

¥ 484,585

₸ 0

Ar 0

K 0

RM 0

₱ 104,161

₨ 12,222

ر.س 0

kr 449,824

$ 12,234,563

$ 1,585

₫ 0

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, 2021	Dec. 31, 2020
Increase (decrease) of income before income tax
Disclosure of sensitivity analysis for foreign currency exchange rates [Line Items]
10% Increase		₩ (1,439,185)	₩ (1,336,821)
10% Decrease		1,439,185	1,336,821
Increase (decrease) of equity
Disclosure of sensitivity analysis for foreign currency exchange rates [Line Items]
10% Increase	[1]	(1,439,185)	(1,336,821)
10% Decrease	[1]	₩ 1,439,185	₩ 1,336,821
[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, 2021	Dec. 31, 2020
Disclosure of financial instruments by type of interest rate [line items]
Short-term borrowings	₩ 4,382,218	₩ 2,113,181
Long-term borrowings	2,265,624	3,003,999
Total	80,529,513	69,724,581
Floating interest rate [member]
Disclosure of financial instruments by type of interest rate [line items]
Short-term borrowings	391,897	171,518
Long-term borrowings	2,405,244	2,191,322
Debt securities	257,667	250,968
Total	₩ 3,054,808	₩ 2,613,808

Risk Management - Summary of _4

Risk Management - Summary of Sensitivity Analysis for Interest Rates (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020
Increase (decrease) of income before income tax
Disclosure Of Sensitivity Analysis For Interest Rates [Line Items]
1% Increase		₩ (30,548)	₩ (26,138)
1% Decrease		30,548	26,138
Increase (decrease) of shareholder's equity
Disclosure Of Sensitivity Analysis For Interest Rates [Line Items]
1% Increase	[1]	(30,548)	(26,138)
1% Decrease	[1]	₩ 30,548	₩ 26,138
[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, 2021	Dec. 31, 2020
Increase (decrease) of income before income tax
Disclosure of Sensitivity analysis for electricity rates [Line Items]
1% Increase		₩ 572,102	₩ 557,310
1% Decrease		(572,102)	(557,310)
Increase (decrease) of shareholder's equity
Disclosure of Sensitivity analysis for electricity rates [Line Items]
1% Increase	[1]	572,102	557,310
1% Decrease	[1]	₩ (572,102)	₩ (557,310)
[1]	The effect on the equity excluding the impact of income taxes.

Risk Management - Summary od Ma

Risk Management - Summary od Maturity Analysis for Non Derivative Financial Liabilities (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2021	Dec. 31, 2020
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings and debt securities		₩ 91,950,482	₩ 82,326,295
Finance lease liabilities		4,928,988	5,209,537
Trade and other payables		9,739,421	8,115,837
Financial guarantee contracts	[1]	3,718,015	3,224,696
Non-derivative financial liabilities, undiscounted cash flows		110,336,906	98,876,365
Financial guarantee liabilities		80,841	66,354
Less than 1 year
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings and debt securities		15,833,589	12,413,346
Finance lease liabilities		620,121	614,442
Trade and other payables		7,569,869	5,679,856
Financial guarantee contracts	[1]	435,729	926,244
Non-derivative financial liabilities, undiscounted cash flows		24,459,308	19,633,888
1~2 Years
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings and debt securities		11,229,657	10,919,041
Finance lease liabilities		636,724	569,161
Trade and other payables		777,017	373,907
Financial guarantee contracts	[1]	0	348,860
Non-derivative financial liabilities, undiscounted cash flows		12,643,398	12,210,969
2~5 Years
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings and debt securities		28,663,693	24,778,020
Finance lease liabilities		1,521,421	1,564,377
Trade and other payables		725,231	894,903
Financial guarantee contracts	[1]	3,105,599	26,230
Non-derivative financial liabilities, undiscounted cash flows		34,015,944	27,263,530
More than 5 years
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Borrowings and debt securities		36,223,543	34,215,888
Finance lease liabilities		2,150,722	2,461,557
Trade and other payables		667,304	1,167,171
Financial guarantee contracts	[1]	176,687	1,923,362
Non-derivative financial liabilities, undiscounted cash flows		₩ 39,218,256	₩ 39,767,978
[1]	This represents the total guarantee amounts associated with the financial guarantee contracts. Financial guarantee liabilities which are recognized as of December 31, 2020 and 2021 are ￦66,354 million and ￦80,841 million, respectively.

Risk Management - Summary of _6

Risk Management - Summary of Maturity Analysis for Non Derivative Financial Assets (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]
Cash and cash equivalents		₩ 2,635,238	₩ 2,029,584	₩ 1,810,129	₩ 1,358,345
Financial assets at fair value through other comprehensive income		435,107	358,559
Financial assets at amortised cost		25,273	14,422
Loans		939,126	821,094
Long-term/short-term financial instruments		1,728,508	2,062,103
Financial assets at fair value through profit or loss		1,032,864	1,881,382
Trade and other receivables		10,036,206	9,784,899
Financial assets held for managing liquidity risk		16,832,322	16,952,043
Less than 1 year
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]
Cash and cash equivalents		2,635,238	2,029,584
Financial assets at fair value through other comprehensive income		0	0
Financial assets at amortised cost		15,422	13,149
Loans		88,396	78,805
Long-term/short-term financial instruments		1,278,014	1,483,482
Financial assets at fair value through profit or loss		360,833	1,196,101
Trade and other receivables		8,123,455	7,920,005
Financial assets held for managing liquidity risk		12,501,358	12,721,126
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 amortised cost		9,840	1,265
Loans		443,146	385,571
Long-term/short-term financial instruments		171,636	252,349
Financial assets at fair value through profit or loss		346	0
Trade and other receivables		1,233,703	1,160,400
Financial assets held for managing liquidity risk		1,858,671	1,799,585
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 amortised cost		11	8
Loans		407,584	325,212
Long-term/short-term financial instruments		286	386
Financial assets at fair value through profit or loss		3,130	2,690
Trade and other receivables		679,048	704,494
Financial assets held for managing liquidity risk		1,090,059	1,032,790
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]	435,107	358,559
Financial assets at amortised cost	[1]	0	0
Loans	[1]	0	31,506
Long-term/short-term financial instruments	[1]	278,572	325,886
Financial assets at fair value through profit or loss	[1]	668,555	682,591
Trade and other receivables	[1]	0	0
Financial assets held for managing liquidity risk	[1]	₩ 1,382,234	₩ 1,398,542
[1]	The maturities cannot be presently determined.

Risk Management - Summary of _7

Risk Management - Summary of Maturity Analysis for Derivative Financial Assets and Liabilities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2021	Dec. 31, 2020
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	₩ (76,319)	₩ (366,732)
Derivative financial assets	661,447	172,910
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	(47,508)	(158,688)
Derivative financial assets	456,690	117,261
Gross settlement | Designated as Hedging Instrument
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	(28,811)	(208,044)
Derivative financial assets	204,757	55,649
Less than 1 year
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	(9,183)	(50,635)
Derivative financial assets	127,118	29,523
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	(6,628)	(12,777)
Derivative financial assets	93,554	18,332
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	(2,555)	(37,858)
Derivative financial assets	33,564	11,191
1~2 Years
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	(5,592)	(62,355)
Derivative financial assets	119,815	1,529
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	(4,954)	(22,827)
Derivative financial assets	54,617	1,529
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	(638)	(39,528)
Derivative financial assets	65,198	0
2~5 Years
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	(35,549)	(194,154)
Derivative financial assets	305,423	86,443
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	(33,635)	(118,704)
Derivative financial assets	202,663	45,237
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	(1,914)	(75,450)
Derivative financial assets	102,760	41,206
More than 5 years
Disclosure of maturity analysis for derivative financial liabilities [line items]
Derivative financial liabilities, undiscounted cash flows	(25,995)	(59,588)
Derivative financial assets	109,091	55,415
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	(2,291)	(4,380)
Derivative financial assets	105,856	52,163
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	(23,704)	(55,208)
Derivative financial assets	₩ 3,235	₩ 3,252

Risk Management - Summary of Fa

Risk Management - Summary of Fair Value Measurement of Instruments (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2021	Dec. 31, 2020
Financial assets, category | At fair value
Disclosure Of Fair Value Measurement Of Instruments [Line Items]
Book value		₩ 2,115,754	₩ 2,406,354
Fair value		2,115,754	2,406,354
Financial assets, category | At amortized cost
Disclosure Of Fair Value Measurement Of Instruments [Line Items]
Book value		15,327,366	14,676,310
Fair value		15,327,366	14,676,310
Financial assets at fair value through other comprehensive income | At fair value
Disclosure Of Fair Value Measurement Of Instruments [Line Items]
Book value		435,107	358,559
Fair value		435,107	358,559
Derivative financial instruments, assets | Not Designated as Hedging Instrument | At fair value
Disclosure Of Fair Value Measurement Of Instruments [Line Items]
Book value		443,027	110,764
Fair value		443,027	110,764
Derivative financial instruments, assets | Designated as Hedging Instrument | At fair value
Disclosure Of Fair Value Measurement Of Instruments [Line Items]
Book value		204,756	55,649
Fair value		204,756	55,649
Financial assets at fair value through profit or loss | At fair value
Disclosure Of Fair Value Measurement Of Instruments [Line Items]
Book value		1,032,864	1,881,382
Fair value		1,032,864	1,881,382
Financial assets at amortized cost | At amortized cost
Disclosure Of Fair Value Measurement Of Instruments [Line Items]
Book value		25,273	14,422
Fair value		25,273	14,422
Loans and receivables | At amortized cost
Disclosure Of Fair Value Measurement Of Instruments [Line Items]
Book value		909,071	790,162
Fair value		909,071	790,162
Long-term financial instruments | At amortized cost
Disclosure Of Fair Value Measurement Of Instruments [Line Items]
Book value		450,494	578,621
Fair value		450,494	578,621
Short-term financial instruments | At amortized cost
Disclosure Of Fair Value Measurement Of Instruments [Line Items]
Book value		1,278,014	1,483,482
Fair value		1,278,014	1,483,482
Trade receivables | At amortized cost
Disclosure Of Fair Value Measurement Of Instruments [Line Items]
Book value		10,029,276	9,780,039
Fair value		10,029,276	9,780,039
Cash and Cash Equivalents | At amortized cost
Disclosure Of Fair Value Measurement Of Instruments [Line Items]
Book value		2,635,238	2,029,584
Fair value		2,635,238	2,029,584
Liabilities | At fair value
Disclosure Of Fair Value Measurement Of Instruments [Line Items]
Book value		78,031	365,119
Fair value		78,031	365,119
Liabilities | At amortized cost
Disclosure Of Fair Value Measurement Of Instruments [Line Items]
Book value		94,679,437	82,461,514
Fair value		90,067,938	87,398,465
Derivative Financial Instruments, Liabilities | Not Designated as Hedging Instrument | At fair value
Disclosure Of Fair Value Measurement Of Instruments [Line Items]
Book value		56,256	157,926
Fair value		56,256	157,926
Derivative Financial Instruments, Liabilities | Designated as Hedging Instrument | At fair value
Disclosure Of Fair Value Measurement Of Instruments [Line Items]
Book value		21,775	207,193
Fair value		21,775	207,193
Secured borrowings | At amortized cost
Disclosure Of Fair Value Measurement Of Instruments [Line Items]
Book value		176,358	63,614
Fair value		176,358	63,614
Unsecured bond | At amortized cost
Disclosure Of Fair Value Measurement Of Instruments [Line Items]
Book value		73,881,671	64,607,401
Fair value		69,803,043	68,839,316
Lease liabilities | At amortized cost
Disclosure Of Fair Value Measurement Of Instruments [Line Items]
Book value		4,410,503	4,621,096
Fair value		4,410,503	4,621,096
Unsecured borrowings | At amortized cost
Disclosure Of Fair Value Measurement Of Instruments [Line Items]
Book value		6,471,484	4,808,206
Fair value		5,938,613	5,513,242
Trade and other payables | At amortized cost
Disclosure Of Fair Value Measurement Of Instruments [Line Items]
Book value	[1]	9,739,421	8,115,837
Fair value	[1]	9,739,421	8,115,837
Bank overdraft | At amortized cost
Disclosure Of Fair Value Measurement Of Instruments [Line Items]
Book value		0	245,360
Fair value		₩ 0	₩ 245,360
[1]	Excludes lease liabilities.

Risk Management - Summary of Si

Risk Management - Summary of Significant Unobservable Inputs Used in Fair Value Measurement of Liabilities (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Derivatives
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [line items]
Interest rate, significant unobservable inputs, liabilities	(-) 0.63% ~ 3.88%	(-) 0.73% ~ 3.08%
Borrowings and debt securities
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [line items]
Interest rate, significant unobservable inputs, liabilities	(-) 0.30% ~ 4.38%	(-) 0.53% ~ 4.38%
Finance lease
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [line items]
Interest rate, significant unobservable inputs, liabilities	0.00% ~ 16.83%	0.57% ~ 16.60%

Risk Management - Summary of _8

Risk Management - Summary of Fair Value Measurement of Assets (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2021	Dec. 31, 2020
Disclosure of fair value measurement of assets [line items]
Financial assets at fair value through other comprehensive income	₩ 435,107	₩ 358,559	[1]
Derivative assets	661,447	172,910
Financial assets at fair value through profit or loss	1,032,864	1,881,382
At fair value
Disclosure of fair value measurement of assets [line items]
Financial assets at fair value through other comprehensive income	435,107	358,559
Derivative assets	647,783	166,413
Financial assets at fair value through profit or loss	1,032,864	1,881,382
Total	2,115,754	2,406,354
At fair value | Level 1
Disclosure of fair value measurement of assets [line items]
Financial assets at fair value through other comprehensive income	273,826	194,670
Derivative assets	0	0
Financial assets at fair value through profit or loss	0	0
Total	273,826	194,670
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	647,783	166,413
Financial assets at fair value through profit or loss	1,027,067	1,875,690
Total	1,674,850	2,042,103
At fair value | Level 3
Disclosure of fair value measurement of assets [line items]
Financial assets at fair value through other comprehensive income	161,281	163,889
Derivative assets	0	0
Financial assets at fair value through profit or loss	5,797	5,692
Total	₩ 167,078	₩ 169,581
[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.

Risk Management - Summary of _9

Risk Management - Summary of Fair Value Measurement of Liabilities (Details) - At fair value - KRW (₩) ₩ in Millions	Dec. 31, 2021	Dec. 31, 2020
Disclosure of fair value measurement of liabilities [line items]
Derivative liabilities	₩ 78,031	₩ 365,119
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	78,031	365,119
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, 2021	Dec. 31, 2020
Changes in fair value measurement, assets
Beginning balance	₩ 17,082,664
Valuation	1,032,864	₩ 1,881,382
Ending balance	17,443,120	17,082,664
Financial assets at fair value through profit or loss, category [member]
Changes in fair value measurement, assets
Beginning balance	1,992,146
Ending balance	1,475,891	1,992,146
Financial assets at fair value through other comprehensive income, category [member]
Changes in fair value measurement, assets
Beginning balance	358,559
Ending balance	435,107	358,559
At fair value
Changes in fair value measurement, assets
Valuation	1,032,864	1,881,382
At fair value | Level 3
Changes in fair value measurement, assets
Valuation	5,797	5,692
At fair value | Level 3 | Financial assets at fair value through profit or loss, category [member]
Changes in fair value measurement, assets
Beginning balance	5,692	5,156
Acquisition	0	359
Reclassified category	0	0
Disposal	0	(446)
Valuation	105	623
Gains (losses) recognised in other comprehensive income on exchange differences, fair value measurement, assets	0	0
Ending balance	5,797	5,692
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	163,889	177,968
Acquisition	8,929	2,900
Reclassified category	0	0
Disposal	(13)	(1)
Valuation	(12,335)	(23,128)
Gains (losses) recognised in other comprehensive income on exchange differences, fair value measurement, assets	320	6,150
Ending balance	160,790	163,889
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	0
Acquisition	500
Reclassified category	0
Disposal	0
Valuation	0
Gains (losses) recognised in other comprehensive income on exchange differences, fair value measurement, assets	(9)
Ending balance	₩ 491	₩ 0

Service Concession Arrangemen_3

Service Concession Arrangements - Summary of Service Concession Arrangements (Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2021KRW (₩)
Disclosure of detailed information about service concession arrangements [line items]
Hydroelectric Power Generation at Semangka, Indonesia (BOT)	₩ 631,616
Less than 1 year
Disclosure of detailed information about service concession arrangements [line items]
Gas Complex - Thermal Power Plant at Ilijan, Philippines (BOT)	51,596
Hydroelectric Power Generation at Semangka, Indonesia (BOT)	29,576
1~2 Years
Disclosure of detailed information about service concession arrangements [line items]
Hydroelectric Power Generation at Semangka, Indonesia (BOT)	29,610
2~3 Years
Disclosure of detailed information about service concession arrangements [line items]
Hydroelectric Power Generation at Semangka, Indonesia (BOT)	29,747
Over 3 years
Disclosure of detailed information about service concession arrangements [line items]
Hydroelectric Power Generation at Semangka, Indonesia (BOT)	₩ 542,683

Related Parties - Summary of Tr

Related Parties - Summary of Transactions Between Related Parties (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Dongducheon Dream Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	₩ 19,923	₩ 7,757	₩ 7,071
Electricity purchase	750,148	552,692	689,510
Outstanding balances for related party transactions [abstract]
Trade receivables	6,282	388
Trade payables	114,613	65,794
Non-trade receivables and others	493	213
Korea Gas Corporation
Disclosure of transactions between related parties [line items]
Electricity sales	96,362	97,685	116,484
Purchase of power generation fuel	5,646,713	3,270,972	4,049,486
Outstanding balances for related party transactions [abstract]
Trade receivables	10,015	9,969
Trade payables	800,509	428,763
Non-trade receivables and others	187	95
Non-trade payables and others	759	617
Daejung Offshore Wind Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	46	32	1
Outstanding balances for related party transactions [abstract]
Non-trade receivables and others	77	31
Daegu Photovoltaic Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	207	325	327
REC purchase	3,532	3,313	3,626
Outstanding balances for related party transactions [abstract]
Trade payables	115	57
Haeng Bok Do Si Photovoltaic Power Co Ltd
Disclosure of transactions between related parties [line items]
REC purchase	393	370	450
Korea Electric Power Industrial Development Co., Ltd.
Disclosure of transactions between related parties [line items]
Service sales	11,208	10,833	11,085
Electricity metering service fee	241,925	212,366	245,057
Outstanding balances for related party transactions [abstract]
Trade receivables	269	508
Trade payables	873	133
Non-trade receivables and others	15	16
Non-trade payables and others	5,880	3,779
Goseong Green Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	514,470	47,701	19,245
Electricity purchase	987,540	0	32
Outstanding balances for related party transactions [abstract]
Trade receivables	495	2,181
Trade payables	218,627
Non-trade receivables and others	76,855	9,214
Non-trade payables and others	59,987	64,986
Gangneung Eco Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Service sales	14,200	10,178	7,446
Outstanding balances for related party transactions [abstract]
Trade receivables	826	661
Non-trade receivables and others	465	146
Non-trade payables and others	97
Shin Pyeongtaek Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	23,501	20,791	21,218
Electricity purchase	653,306	520,737	119,162
Outstanding balances for related party transactions [abstract]
Trade receivables	1,788	1,348
Trade payables	79,828	47,948
Non-trade receivables and others	3,116	2,823
Non-trade payables and others	99	85
Noeul Green Energy Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	30	30	30
REC purchase	10,014	10,634	22,767
Outstanding balances for related party transactions [abstract]
Trade receivables	3	3
Non-trade receivables and others	1,169	969
Samcheok Eco Materials Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	620	700	627
Electricity purchase	13,612	10,713	9,425
Outstanding balances for related party transactions [abstract]
Trade receivables	52	47
YTN Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	1,922	1,805	2,257
Service purchase	388	353	333
Outstanding balances for related party transactions [abstract]
Trade receivables	99	97
Busan Green Energy Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	49	34	18
Electricity purchase	18,996	18,678	13,811
Outstanding balances for related party transactions [abstract]
Trade receivables	1	5
Non-trade receivables and others	20,658	13,946
Gunsan Bio Energy Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	20	102	4,755
Electricity purchase	0	24	3,022
Outstanding balances for related party transactions [abstract]
Non-trade receivables and others	11,728
Korea Electric Vehicle Charging Service
Disclosure of transactions between related parties [line items]
Electricity sales	3,059	1,956	1,029
Service purchase	393	581	536
Outstanding balances for related party transactions [abstract]
Trade receivables	193	141
Non-trade receivables and others	120	281
Yaksu ESS Co., Ltd.
Disclosure of transactions between related parties [line items]
Service purchase	1,715	217	1,191
Outstanding balances for related party transactions [abstract]
Trade payables	1,374	739
Gangwon Wind Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	1,865	2,109	2,433
Electricity purchase	19,623	23,350	24,116
Outstanding balances for related party transactions [abstract]
Trade receivables	8	6
Trade payables	4,293	2,678
Gwangyang Green Energy Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	486	23	122
Outstanding balances for related party transactions [abstract]
Non-trade receivables and others	532	1,356
Bigeum Resident Photovoltaic Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	755	85	0
Outstanding balances for related party transactions [abstract]
Trade receivables	922
Hyundai Green Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Design service	11,934	17,257	13,106
Electricity purchase	0	349,778	507,662
Outstanding balances for related party transactions [abstract]
Trade receivables	229	554
Trade payables		9,825
Korea Power Exchange
Disclosure of transactions between related parties [line items]
Service sales	39,796	25,919	7,670
Trading fees	86,716	87,361	120,509
Outstanding balances for related party transactions [abstract]
Trade receivables	627	1,608
Trade payables		1,362
Non-trade receivables and others	1,300	24
Non-trade payables and others	2,189	70,456
Taebaek Wind Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Service sales	44	226	991
Electricity purchase	5,930	4,003	7,070
Outstanding balances for related party transactions [abstract]
Trade payables	560	443
Non-trade receivables and others		1,405
Non-trade payables and others	262
Taeback Guinemi Wind Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	26	37	77
Electricity purchase	5,910	5,023	349
Taebaek Guinemi Wind Power Co., Ltd
Outstanding balances for related party transactions [abstract]
Trade payables	670	413
Non-trade payables and others		509
Pyeongchang Wind Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	1,180	2,064	1,189
Electricity purchase	4,099	3,969	5,188
Outstanding balances for related party transactions [abstract]
Trade receivables	4	3
Daeryun Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	1,944	1,947	1,879
Electricity purchase	157,234	99,523	144,862
Outstanding balances for related party transactions [abstract]
Trade receivables	213	189
Trade payables	21,362	16,079
Changjuk Wind Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	463	2,067	927
Electricity purchase	6,213	6,084	6,994
Outstanding balances for related party transactions [abstract]
Trade payables	724	461
Non-trade payables and others	295	309
GS Donghae Electric Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	21,127	31,557	15,792
Electricity purchase	760,377	660,351	681,379
Outstanding balances for related party transactions [abstract]
Trade receivables	383	386
Trade payables	113,529	91,213
Non-trade receivables and others	272	321
Non-trade payables and others	17	36
KNH Solar Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	14	16	17
Electricity purchase	3,222	3,564	3,377
Outstanding balances for related party transactions [abstract]
Trade receivables	1	1
Trade receivables	82	137
Trade payables		14
Non-trade payables and others		187
S-Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Service sales	5,229	6,682	6,535
Electricity purchase	608,530	293,515	522,469
Outstanding balances for related party transactions [abstract]
Trade payables	91,277	23,415
Non-trade receivables and others	48	46
PND Solar Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	416	409	407
Electricity purchase	5,502	5,234	557
Outstanding balances for related party transactions [abstract]
Trade payables		58
Hyundai Ecoenergy Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	187	167	117
Electricity purchase	25,762	17,777	6,810
Outstanding balances for related party transactions [abstract]
Trade receivables	19	16
Trade payables	732
YeongGwang Yaksu Wind Electric Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	78	77	81
Electricity purchase	11,729	9,151	6,511
Outstanding balances for related party transactions [abstract]
Trade receivables	6	8
Korea Energy Solution Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	2	7	52
Electricity purchase	0	0	15
Gwangbaek Solar Power Investment Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity purchase	742	373	0
Green Energy Electricity Generation Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	0	14	0
Electricity purchase	1,238	0	0
Namjeongsusang Solar Power Operation Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	22	14	0
Electricity purchase	14,286	0	0
Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1
Disclosure of transactions between related parties [line items]
Service sales	399	291	0
Muan Solar Park Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	232	57	0
Electricity purchase	31,017	0	0
Outstanding balances for related party transactions [abstract]
Trade receivables		24
Non-trade receivables and others	23
Go deok Clean Energy Co., Ltd
Outstanding balances for related party transactions [abstract]
Non-trade receivables and others		1
Suwon New Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	1,820	2,974	5,606
Outstanding balances for related party transactions [abstract]
Trade receivables		2
Non-trade receivables and others	1,198	712
Muan Sunshine Solar Power Plant Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	52	30	0
Electricity purchase	15,900	0	0
Outstanding balances for related party transactions [abstract]
Trade payables	1,748
Nine Associates (Overseas)
Disclosure of transactions between related parties [line items]
Electricity sales and others	125,723	66,755	98,450
Haeng Bok Do Si Photovoltaic Power
Disclosure of transactions between related parties [line items]
Electricity sales	2	2	2
Energy Infra Asset Management Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	4,629	0	0
Service sales	2,657	0	0
Taebaek Gadeoksan Wind Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	295	0	0
Electricity purchase	16,360	0	0
Outstanding balances for related party transactions [abstract]
Trade payables	8,397
Non-trade receivables and others	119
Non-trade payables and others	1,571
ITR Co., Ltd.
Disclosure of transactions between related parties [line items]
Service sales	3	0	0
Structure test network Co., Ltd.
Disclosure of transactions between related parties [line items]
Service sales	5	0	0
Bitgoel Eco Energy Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	282	0	0
Outstanding balances for related party transactions [abstract]
Non-trade receivables and others	27
Anjwa Smart Farm & Solar City Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	624	0	0
Electricity purchase	24,601	0	0
Daewon Green Energy Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	155	0	0
Outstanding balances for related party transactions [abstract]
Non-trade receivables and others	94
Saemangeum Heemang Photovoltaic Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	13	0	0
UD four M Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	4	0	0
Dongbu Highway Solar Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	5	0	0
Electricity purchase	2,605	0	0
Outstanding balances for related party transactions [abstract]
Trade receivables	1
Trade payables	98
Non-trade payables and others	90
Seobu Highway Solar Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	8	0	0
Electricity purchase	2,936	0	0
Outstanding balances for related party transactions [abstract]
Trade payables	177
Non-trade payables and others	105
SureDataLab Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	1	0	0
Hankook Electric Power Information Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	1	0	0
KOSTURE Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	1	0	0
Outstanding balances for related party transactions [abstract]
Trade receivables	1
Goesan Solar park Co., Ltd
Disclosure of transactions between related parties [line items]
Electricity purchase	6,209	0	0
Outstanding balances for related party transactions [abstract]
Trade payables	73
Jeju Gimnyeong Wind Power Co., Ltd
Disclosure of transactions between related parties [line items]
Electricity purchase	12,833	0	0
Outstanding balances for related party transactions [abstract]
Trade payables	885
Seoroseoro Sunny Power Plant Co Ltd
Disclosure of transactions between related parties [line items]
Electricity purchase	217	0	0
YuDang Solar Co., Ltd
Disclosure of transactions between related parties [line items]
Electricity purchase	3,495	0	0
One Associates (Overseas)
Disclosure of transactions between related parties [line items]
Electricity purchase	502	0	0
Four Associates (Overseas)
Outstanding balances for related party transactions [abstract]
Non-trade receivables and others	3,196	3,248
Non-trade payables and others	502
Naepo Green Energy Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	467	217	154
Outstanding balances for related party transactions [abstract]
Trade receivables	42	56
Cheongna Energy Co., Ltd.
Disclosure of transactions between related parties [line items]
Service sales	16,469	13,791	9,922
Electricity purchase	57	66	58,747
Outstanding balances for related party transactions [abstract]
Trade receivables	4,164	1,592
Non-trade receivables and others	1,350	1,186
Non-trade payables and others	1
Dayone Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.)
Disclosure of transactions between related parties [line items]
Service sales	8,159	4,816	3,437
Electricity purchase	5,409	1,120	2,847
Outstanding balances for related party transactions [abstract]
Trade receivables	52	57
Trade payables	1,009	10
Non-trade receivables and others	13,297	11,749
Non-trade payables and others	11,306	9,119
Daegu Green Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	1,053	1,285	1,151
Electricity purchase	289,052	215,224	296,464
Outstanding balances for related party transactions [abstract]
Trade receivables	71	44
Trade payables	35,766	26,213
Non-trade receivables and others	55	55
KAPES, Inc.
Disclosure of transactions between related parties [line items]
Commission	413	476	504
Service purchase	64,140	219,673	142,511
Outstanding balances for related party transactions [abstract]
Trade receivables	2	2
Non-trade receivables and others		5,172
Non-trade payables and others	2,121	20,577
Honam Wind Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	71	502	657
Electricity purchase	4,807	4,382	5,306
Outstanding balances for related party transactions [abstract]
Trade payables	575	216
Non-trade payables and others		345
Jeongam Wind Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	588	1,213	1,198
Electricity purchase	3,145	5,982	0
Outstanding balances for related party transactions [abstract]
Non-trade receivables and others		162
Non-trade payables and others		692
Korea Power Engineering Service Co., Ltd.
Disclosure of transactions between related parties [line items]
Service sales	339	203	348
Service purchase	1,315	1,594	1,774
Outstanding balances for related party transactions [abstract]
Non-trade receivables and others	48	43
Seokmun Energy Co., Ltd.
Disclosure of transactions between related parties [line items]
Service sales	1,701	1,932	1,495
Electricity purchase	44,315	33,164	26,370
Outstanding balances for related party transactions [abstract]
Trade receivables	34	62
Trade payables	7,941	4,898
Non-trade receivables and others	149	9,460
Non-trade payables and others		9,559
Incheon New Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Construction revenue	14	14	354
Chun-cheon Energy Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	2,329	2,657	2,397
Electricity purchase	327,536	222,069	313,471
Outstanding balances for related party transactions [abstract]
Trade receivables	126	98
Trade payables	41,410	27,428
Non-trade receivables and others	167	165
Yeonggwangbaeksu Wind Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	1,836	1,788	1,744
Electricity purchase	9,471	11,232	11,739
Outstanding balances for related party transactions [abstract]
Trade receivables	6	8
Trade payables	1,099	405
Non-trade receivables and others	53	159
Non-trade payables and others		1,747
Yeonggwang Wind Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	818	793	705
Electricity purchase	21,004	24,103	11,940
Outstanding balances for related party transactions [abstract]
Trade receivables	10	12
Trade payables	730	886
Non-trade receivables and others	59	54
Non-trade payables and others		3,038
Sam-Yang Photovoltaic Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	1,920	33	0
Electricity purchase	5,852	3,848	0
Outstanding balances for related party transactions [abstract]
Trade receivables	5	5
Non-trade payables and others		625
NH-Amundi Global Infrastructure Investment Private Investment Trust 21
Disclosure of transactions between related parties [line items]
Service sales	1,727	1,388	0
KW Nuclear Components Co., Ltd.
Disclosure of transactions between related parties [line items]
Service sales	2,598	1,639	721
Outstanding balances for related party transactions [abstract]
Trade receivables		4
KEPCO-Uhde Inc.
Disclosure of transactions between related parties [line items]
Electricity sales	10	8	15
Outstanding balances for related party transactions [abstract]
Non-trade payables and others	10
Busan Shinho Solar Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	376	353	452
REC purchase	7,895	7,296	7,843
Outstanding balances for related party transactions [abstract]
Trade receivables	2	2
Trade payables	281	135
Non-trade payables and others		780
Global Trade Of Power System Co., Ltd.
Disclosure of transactions between related parties [line items]
Service purchase	323	337	502
Outstanding balances for related party transactions [abstract]
Non-trade payables and others	7
Expressway Solar-light Power Generation Co., Ltd.
Disclosure of transactions between related parties [line items]
REC purchase	3,146	2,472	3,067
Outstanding balances for related party transactions [abstract]
Trade payables	102
Daesan Green Energy Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	523	703	39
Electricity purchase	146,776	104,854	0
Outstanding balances for related party transactions [abstract]
Trade receivables	11	11
Trade payables	5,120	7,694
Non-trade receivables and others	120	216
Taebaek Gadeoksan Wind Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	2	3	0
Electricity purchase	5,080	0	0
Outstanding balances for related party transactions [abstract]
Trade payables		2,473
Non-trade receivables and others		5
Non-trade payables and others		5
Cheong-Song Noraesan Wind Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	30	29	6
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 sales	1,141	2,846	2,230
Electricity purchase	5	0	0
Outstanding balances for related party transactions [abstract]
Non-trade receivables and others	4,268	3,141
Jaeun Resident Wind Power Plant Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	0	0	105
Dangjin Eco Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	32	33	4
Electricity purchase	4,139	3,953	0
Outstanding balances for related party transactions [abstract]
Trade receivables	3	3
Trade payables	276	326
Bitsolar Energy Co., Ltd.,
Disclosure of transactions between related parties [line items]
Electricity sales	296	42	0
Electricity purchase	5,703	0	0
Outstanding balances for related party transactions [abstract]
Non-trade receivables and others	7
Non-trade payables and others	54
Busan Industrial Solar Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity purchase	2,815	19	0
Outstanding balances for related party transactions [abstract]
Trade receivables	1
Trade payables	54	1
Non-trade payables and others	24
Haemodum Solar Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	6	4	0
Electricity purchase	1,625	967	0
Outstanding balances for related party transactions [abstract]
Trade receivables	1
Yeongam Solar Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	339	165	0
Electricity purchase	47,805	32,208	0
Outstanding balances for related party transactions [abstract]
Trade receivables	29	26
Trade payables	3,324	14,652
Solaseado Solar Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	2,890	66	0
Electricity purchase	31,031	28,516	0
Chungsongmeon BongSan wind power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	1	0	0
Energyco Co., Ltd. (formerly, Energyco LLC)
Disclosure of transactions between related parties [line items]
Electricity sales	1	0	0
Busan Industrial Solar Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	9	0	0
Omisan Wind Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity sales	1	0	0
Electricity purchase	7	0	0
Thirty five Joint ventures (Overseas)
Disclosure of transactions between related parties [line items]
Electricity sales and others	773,289	831,596	1,275,279
KW Nuclear Components Co., Ltd
Disclosure of transactions between related parties [line items]
Service sales	96	0	0
Samsu Wind Power Co., Ltd.
Disclosure of transactions between related parties [line items]
Electricity purchase	2,800	0	0
Outstanding balances for related party transactions [abstract]
Trade payables	1,300
Five Joint ventures (Overseas)
Disclosure of transactions between related parties [line items]
Electricity purchase and Others	49,055	14,767	7,232
Eighteen Joint ventures (Overseas)
Outstanding balances for related party transactions [abstract]
Trade receivables	84,150	58,839
Non-trade receivables and others	26,060	17,217
Non-trade payables and others	22,050	105,682
Korea Development Bank
Disclosure of transactions between related parties [line items]
Electricity sales	4,177	4,248	3,948
Dividend paid	256,862	17	20
Interest income	756	3,461	2,091
Interest expense	2,756	3,872	₩ 4,063
Outstanding balances for related party transactions [abstract]
Non-trade receivables and others	420,732	206,916
Non-trade payables and others	21,172	123
Accrued interest income	154	51
Derivative assets	₩ 59,139	20,167
Derivative liabilities		₩ 20,001

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, 2021KRW (₩)
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	₩ 205,205
Changes in Loans receivable transactions between related parties
Loans	106,230
Collection	(43,072)
Others	50,463
Ending balance	318,826
KNOC Nigerian East & West Oil Co., Ltd. | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	27,149
Changes in Loans receivable transactions between related parties
Loans	34
Others	2,298
Ending balance	29,481
KNOC Nigerian East & West Oil Co., Ltd. | Accumulated impairment [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	(5,246)
Changes in Loans receivable transactions between related parties
Others	(2,995)
Ending balance	(8,241)
Xe-Pian Xe-Namnoy Power Co., Ltd. | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	19,692
Changes in Loans receivable transactions between related parties
Others	1,764
Ending balance	21,456
PT Wampu Electric Power | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	12,358
Changes in Loans receivable transactions between related parties
Collection	(1,349)
Others	1,991
Ending balance	13,000
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
Ending balance	12,396
Gunsan Bio Energy Co., Ltd. | Accumulated impairment [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	(10,128)
Changes in Loans receivable transactions between related parties
Loans	(2,268)
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	3,500
Changes in Loans receivable transactions between related parties
Loans	7,712
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
Ending balance	1,000
Bitgoel Eco Energy Co., Ltd. | Gross carrying amount [member]
Changes in Loans receivable transactions between related parties
Loans	19,349
Ending balance	19,349
Solaseado Solar Power Co., Ltd. | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	64,000
Changes in Loans receivable transactions between related parties
Loans	10,000
Collection	(39,000)
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	4,844
Changes in Loans receivable transactions between related parties
Loans	2,282
Collection	(1,450)
Others	458
Ending balance	6,134
Horus Solar, S.A. De C.V. | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	13,380
Changes in Loans receivable transactions between related parties
Loans	2,755
Collection	(843)
Others	1,222
Ending balance	16,514
SUNMEX RENOVABLES, S.A. DE C.V. | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	1,842
Changes in Loans receivable transactions between related parties
Loans	11,377
Others	352
Ending balance	13,571
Kelar S.A | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	39,616
Changes in Loans receivable transactions between related parties
Others	3,551
Ending balance	43,167
DE Energia SpA | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	6,232
Changes in Loans receivable transactions between related parties
Others	559
Ending balance	6,791
Daehan Wind Power PSC | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	10,700
Changes in Loans receivable transactions between related parties
Loans	1,927
Others	1,047
Ending balance	13,674
PT. Tanjung Power Indonesia | Gross carrying amount [member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	705
Changes in Loans receivable transactions between related parties
Loans	314
Others	71
Ending balance	1,090
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
Ending balance	3,165
Pulau Indah Power Plant Sdn. Bhd. | Gross carrying amount [member]
Changes in Loans receivable transactions between related parties
Loans	10,006
Others	(10,006)
Guadalupe Solar SpA | Gross carrying amount [member]
Changes in Loans receivable transactions between related parties
Loans	3,365
Collection	(6)
Others	1
Ending balance	3,360
Foresight Iberian Solar Group Holding, S.L | Gross carrying amount [member]
Changes in Loans receivable transactions between related parties
Loans	9,376
Collection	(424)
Others	50,381
Ending balance	59,333
Capman Lynx SCA, SICAR | Gross carrying amount [member]
Changes in Loans receivable transactions between related parties
Loans	30,001
Others	(231)
Ending balance	₩ 29,770

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, 2021KRW (₩)
Disclosure of Borrowings transactions between related parties [Line Items]
Beginning balance	₩ 253,555
Changes in Borrowings transactions between related parties [Abstract]
Borrowings	206,829
Repayment	(112,342)
Others	5,282
Ending balance	353,324
Facility
Disclosure of Borrowings transactions between related parties [Line Items]
Beginning balance	50,293
Changes in Borrowings transactions between related parties [Abstract]
Borrowings	56,906
Repayment	(10,863)
Others	1,684
Ending balance	98,020
Others
Disclosure of Borrowings transactions between related parties [Line Items]
Beginning balance	2,946
Changes in Borrowings transactions between related parties [Abstract]
Borrowings	0
Repayment	(437)
Others	0
Ending balance	2,509
Operating funds
Disclosure of Borrowings transactions between related parties [Line Items]
Beginning balance	144,300
Changes in Borrowings transactions between related parties [Abstract]
Borrowings	140,000
Repayment	(100,000)
Others	0
Ending balance	184,300
Syndicated Loans
Disclosure of Borrowings transactions between related parties [Line Items]
Beginning balance	15,923
Changes in Borrowings transactions between related parties [Abstract]
Borrowings	0
Repayment	(1,042)
Others	(351)
Ending balance	14,530
EBL
Disclosure of Borrowings transactions between related parties [Line Items]
Beginning balance	40,093
Changes in Borrowings transactions between related parties [Abstract]
Borrowings	9,923
Repayment	0
Others	3,949
Ending balance	₩ 53,965

Related Parties - Summary of Gu

Related Parties - Summary of Guarantees Provided To Associates Or Joint Ventures (Details) ر.س in Thousands, $ in Thousands, $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2021USD ($)	Dec. 31, 2021KRW (₩)	Dec. 31, 2021MXN ($)	Dec. 31, 2021SAR (ر.س)
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 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.
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
Performance guarantees and others
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 Guarantee	Rabigh Electricity Company	Rabigh Electricity Company	Rabigh Electricity Company	Rabigh Electricity Company
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
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 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
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
Debt 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 Guarantee	SMBC Singapore	SMBC Singapore	SMBC Singapore	SMBC Singapore
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		₩ 285,000
Debt 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 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
Name of Principal obligor	Barakah One Company	Barakah One Company	Barakah One Company	Barakah One Company
Amount of guarantees | $	$ 1,223,355
Performance guarantees and others
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 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
Name of Principal obligor	Barakah One Company	Barakah One Company	Barakah One Company	Barakah One Company
Amount of guarantees | $	$ 4,349,360
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 Guarantee	EFS Renewables Holdings, LLC, CA-CIB and others	EFS Renewables Holdings, LLC, CA-CIB and others	EFS Renewables Holdings, LLC, CA-CIB and others	EFS Renewables Holdings, LLC, CA-CIB and others
Name of Principal obligor	RE Holiday Holdings LLC	RE Holiday Holdings LLC	RE Holiday Holdings LLC	RE Holiday Holdings LLC
Amount of guarantees | $	$ 222,077
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 Guarantee	EFS Renewables Holdings, LLC	EFS Renewables Holdings, LLC	EFS Renewables Holdings, LLC	EFS Renewables Holdings, LLC
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
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 Guarantee	Firstar Development, LLC	Firstar Development, LLC	Firstar Development, LLC	Firstar Development, LLC
Name of Principal obligor	RE Barren Ridge 1 Holdings LLC	RE Barren Ridge 1 Holdings LLC	RE Barren Ridge 1 Holdings LLC	RE Barren Ridge 1 Holdings LLC
Amount of guarantees | $	$ 68,838
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 Guarantee	ING Bank	ING Bank	ING Bank	ING Bank
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
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 Guarantee	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank
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
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 Guarantee	CENACE and others	CENACE and others	CENACE and others	CENACE and others
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
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 Guarantee	SEMARNAT	SEMARNAT	SEMARNAT	SEMARNAT
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
Other 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 Guarantee	SEMARNAT	SEMARNAT	SEMARNAT	SEMARNAT
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
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 Guarantee	CENACE	CENACE	CENACE	CENACE
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
Collateralized money invested
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 Guarantee	Malaysian Trustee Berhad	Malaysian Trustee Berhad	Malaysian Trustee Berhad	Malaysian Trustee Berhad
Name of Principal obligor	Pulau Indah Power Plant Sdn. Bhd.	Pulau Indah Power Plant Sdn. Bhd.	Pulau Indah Power Plant Sdn. Bhd.	Pulau Indah Power Plant Sdn. Bhd.
Amount of guarantees		₩ 22,099
Guarantees for supplemental funding and others
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 Guarantee	NH investment & securities Co., Ltd. and others	NH investment & securities Co., Ltd. and others	NH investment & securities Co., Ltd. and others	NH investment & securities Co., Ltd. and others
Name of Principal obligor	Dayone Energy Co., Ltd	Dayone Energy Co., Ltd	Dayone Energy Co., Ltd	Dayone Energy Co., Ltd
Amount of guarantees		₩ 76,800
Payment guarantees for business reserve
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 Guarantee	Krung Thai Bank	Krung Thai Bank	Krung Thai Bank	Krung Thai Bank
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	$ 2,500	₩ 92,441
Collateralized money invested
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 Guarantee	Kookmin Bank and others	Kookmin Bank and others	Kookmin Bank and others	Kookmin Bank and others
Name of Principal obligor	Cheongna Energy Co., Ltd.	Cheongna Energy Co., Ltd.	Cheongna Energy Co., Ltd.	Cheongna Energy Co., Ltd.
Amount of guarantees		₩ 11,198
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 Guarantee	SK E&C	SK E&C	SK E&C	SK E&C
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
Performance guarantees and others
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 Guarantee	National Bank of Kuwait	National Bank of Kuwait	National Bank of Kuwait	National Bank of Kuwait
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
Collateralized money invested
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 Guarantee	Korea Development Bank	Korea Development Bank	Korea Development Bank	Korea Development Bank
Name of Principal obligor	Daegu Photovoltaic Co., Ltd.	Daegu Photovoltaic Co., Ltd.	Daegu Photovoltaic Co., Ltd.	Daegu Photovoltaic Co., Ltd.
Amount of guarantees		₩ 2,342
Debt 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 Guarantee	BNK Securities	BNK Securities	BNK Securities	BNK Securities
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
Collateralized money invested
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 Guarantee	Kookmin Bank and others	Kookmin Bank and others	Kookmin Bank and others	Kookmin Bank and others
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		₩ 39,524
Collateralized money invested
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 Guarantee	Woori Bank	Woori Bank	Woori Bank	Woori Bank
Name of Principal obligor	PT. Mutiara Jawa	PT. Mutiara Jawa	PT. Mutiara Jawa	PT. Mutiara Jawa
Amount of guarantees		₩ 2,569
Collateralized money invested
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 Guarantee	Nonghyup Bank	Nonghyup Bank	Nonghyup Bank	Nonghyup Bank
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		₩ 223
Collateralized money invested
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 Guarantee	IBK	IBK	IBK	IBK
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		₩ 361
Collateralized money invested
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 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
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		₩ 4,806
Guarantees for supplemental funding
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 Guarantee	Kookmin Bank and others	Kookmin Bank and others	Kookmin Bank and others	Kookmin Bank and others
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		₩ 90,800
Collateralized money invested
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 Guarantee	IBK	IBK	IBK	IBK
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		₩ 1,268
Collateralized money invested
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 Guarantee	IBK	IBK	IBK	IBK
Name of Principal obligor	Dayone Energy Co., Ltd	Dayone Energy Co., Ltd	Dayone Energy Co., Ltd	Dayone Energy Co., Ltd
Collateralized money invested
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 Guarantee	Kookmin Bank and others	Kookmin Bank and others	Kookmin Bank and others	Kookmin Bank and others
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		₩ 93,074
Collateralized money invested
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 Guarantee	Nonghyup Bank	Nonghyup Bank	Nonghyup Bank	Nonghyup Bank
Name of Principal obligor	Haemodum Solar Co., Ltd.	Haemodum Solar Co., Ltd.	Haemodum Solar Co., Ltd.	Haemodum Solar Co., Ltd.
Amount of guarantees		₩ 3,081
Collateralized money invested
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 Guarantee	Korea Development Bank and others	Korea Development Bank and others	Korea Development Bank and others	Korea Development Bank and others
Name of Principal obligor	Sam-Yang Photovoltaic Power Co., Ltd.	Sam-Yang Photovoltaic Power Co., Ltd.	Sam-Yang Photovoltaic Power Co., Ltd.	Sam-Yang Photovoltaic Power Co., Ltd.
Amount of guarantees		₩ 4,993
Guarantees for supplemental funding
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 Guarantee	IBK	IBK	IBK	IBK
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		₩ 18,989
Collateralized money invested
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 Guarantee	IBK and others	IBK and others	IBK and others	IBK and others
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		₩ 6,083
Collateralized money invested
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 Guarantee	Hana Bank and others	Hana Bank and others	Hana Bank and others	Hana Bank and others
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		₩ 6,784
Collateralized money invested
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 Guarantee	Hana Bank and others	Hana Bank and others	Hana Bank and others	Hana Bank and others
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		₩ 721
Collateralized money invested
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 Guarantee	Hana Bank and others	Hana Bank and others	Hana Bank and others	Hana Bank and others
Name of Principal obligor	YuDang Solar Co., Ltd.	YuDang Solar Co., Ltd.	YuDang Solar Co., Ltd.	YuDang Solar Co., Ltd.
Amount of guarantees		₩ 565
Collateralized money invested
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 Guarantee	Nonghyup Bank and others	Nonghyup Bank and others	Nonghyup Bank and others	Nonghyup Bank and others
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		₩ 6,971
Collateralized money invested
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 Guarantee	Hana Bank and others	Hana Bank and others	Hana Bank and others	Hana Bank and others
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		₩ 3,197
Debt 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 Guarantee	Sumitomo mitsui banking	Sumitomo mitsui banking	Sumitomo mitsui banking	Sumitomo mitsui banking
Name of Principal obligor	PT. Tanjung Power Indonesia	PT. Tanjung Power Indonesia	PT. Tanjung Power Indonesia	PT. Tanjung Power Indonesia
Amount of guarantees | $	$ 24,544
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 Guarantee	PT. Adaro Indonesia	PT. Adaro Indonesia	PT. Adaro Indonesia	PT. Adaro Indonesia
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
Guarantees for supplemental funding
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 Guarantee	Sumitomo mitsui banking and others	Sumitomo mitsui banking and others	Sumitomo mitsui banking and others	Sumitomo mitsui banking and others
Name of Principal obligor	PT. Tanjung Power Indonesia	PT. Tanjung Power Indonesia	PT. Tanjung Power Indonesia	PT. Tanjung Power Indonesia
Collateralized money invested
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 Guarantee	Hana Bank and others	Hana Bank and others	Hana Bank and others	Hana Bank and others
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		₩ 19,317
Performance 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 Guarantee	Credit Agricole Corporate & Investment Bank Seoul	Credit Agricole Corporate & Investment Bank Seoul	Credit Agricole Corporate & Investment Bank Seoul	Credit Agricole Corporate & Investment Bank Seoul
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
Collateralized money invested
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 Guarantee	Korea Development Bank and others	Korea Development Bank and others	Korea Development Bank and others	Korea Development Bank and others
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		₩ 5,841
Collateralized money invested
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 Guarantee	Kookmin Bank and others	Kookmin Bank and others	Kookmin Bank and others	Kookmin Bank and others
Name of Principal obligor	Seokmun Energy Co., Ltd	Seokmun Energy Co., Ltd	Seokmun Energy Co., Ltd	Seokmun Energy Co., Ltd
Amount of guarantees		₩ 13,842
Payment 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 Guarantee	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Name of Principal obligor	DE Energia SpA	DE Energia SpA	DE Energia SpA	DE Energia SpA
Amount of guarantees | $	$ 950
Collateralized money invested
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 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
Name of Principal obligor	DE Energia SpA	DE Energia SpA	DE Energia SpA	DE Energia SpA
Amount of guarantees | $	$ 5,728
Collateralized money invested
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 Guarantee	Kookmin Bank and others	Kookmin Bank and others	Kookmin Bank and others	Kookmin Bank and others
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		₩ 25,896
Collateralized money invested
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 Guarantee	Shinhan Bank and others	Shinhan Bank and others	Shinhan Bank and others	Shinhan Bank and others
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		₩ 4,041
Collateralized money invested
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 Guarantee	Korea Development Bank and others	Korea Development Bank and others	Korea Development Bank and others	Korea Development Bank and others
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		₩ 243,772
Performance guarantees
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 Guarantee	Shinhan Bank and others	Shinhan Bank and others	Shinhan Bank and others	Shinhan Bank and others
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		₩ 24,054
Performance guarantees
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 Guarantee	Hana Bank, MUFG	Hana Bank, MUFG	Hana Bank, MUFG	Hana Bank, MUFG
Name of Principal obligor	Kelar S.A.	Kelar S.A.	Kelar S.A.	Kelar S.A.
Amount of guarantees | $	$ 54,282
Performance guarantees
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 Guarantee	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank
Name of Principal obligor	Daehan Wind Power PSC	Daehan Wind Power PSC	Daehan Wind Power PSC	Daehan Wind Power PSC
Amount of guarantees | $	$ 1,500
Payment guarantees
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 Guarantee	Hana Bank	Hana Bank	Hana Bank	Hana Bank
Name of Principal obligor	Daehan Wind Power PSC	Daehan Wind Power PSC	Daehan Wind Power PSC	Daehan Wind Power PSC
Amount of guarantees | $	$ 1,898
Collateralized money invested
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 Guarantee	Kookmin Bank and others	Kookmin Bank and others	Kookmin Bank and others	Kookmin Bank and others
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		₩ 2,728
Collateralized money invested
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 Guarantee	KDB Capital Corporation and others	KDB Capital Corporation and others	KDB Capital Corporation and others	KDB Capital Corporation and others
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		₩ 17,646
Collateralized money invested
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 Guarantee	IBK	IBK	IBK	IBK
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		₩ 21,244
Payment guarantees
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 Guarantee	SEM Investment Co., Ltd.	SEM Investment Co., Ltd.	SEM Investment Co., Ltd.	SEM Investment Co., Ltd.
Name of Principal obligor	Samcheok Eco Materials Co., Ltd.	Samcheok Eco Materials Co., Ltd.	Samcheok Eco Materials Co., Ltd.	Samcheok Eco Materials Co., Ltd.
Amount of guarantees | $	$ 0
Collateralized money invested
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 Guarantee	IBK	IBK	IBK	IBK
Name of Principal obligor	Yaksu ESS Co., Ltd.	Yaksu ESS Co., Ltd.	Yaksu ESS Co., Ltd.	Yaksu ESS Co., Ltd.
Amount of guarantees		₩ 716
Collateralized money invested
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 Guarantee	IBK	IBK	IBK	IBK
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		₩ 1,713
Guarantees for supplemental funding
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 Guarantee	IBK and others	IBK and others	IBK and others	IBK and others
Name of Principal obligor	Naepo Green Energy Co., Ltd.	Naepo Green Energy Co., Ltd.	Naepo Green Energy Co., Ltd.	Naepo Green Energy Co., Ltd.
Amount of guarantees		₩ 30,000
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.	Korea Southern Power Co., Ltd.	Korea Southern Power Co., Ltd.	Korea Southern Power Co., Ltd.
Name Of Guarantee	IBK and others	IBK and others	IBK and others	IBK and others
Name of Principal obligor	Naepo Green Energy Co., Ltd.	Naepo Green Energy Co., Ltd.	Naepo Green Energy Co., Ltd.	Naepo Green Energy Co., Ltd.
Amount of guarantees | $	$ 0
Collateralized money invested
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 Guarantee	Hana Bank and others	Hana Bank and others	Hana Bank and others	Hana Bank and others
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		₩ 16,495
Collateralized money invested
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 Guarantee	MUFG and others	MUFG and others	MUFG and others	MUFG and others
Name of Principal obligor	PT. Tanjung Power Indonesia	PT. Tanjung Power Indonesia	PT. Tanjung Power Indonesia	PT. Tanjung Power Indonesia
Amount of guarantees		₩ 46,546
Collateralized money invested
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 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
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		₩ 37,360
Collateralized money invested
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 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
Name of Principal obligor	DE Energia SpA	DE Energia SpA	DE Energia SpA	DE Energia SpA
Amount of guarantees		₩ 8,921
Collateralized money invested
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 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
Name of Principal obligor	Bitsolar Energy Co., Ltd	Bitsolar Energy Co., Ltd	Bitsolar Energy Co., Ltd	Bitsolar Energy Co., Ltd
Amount of guarantees		₩ 352
Collateralized money invested
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 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
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		₩ 5,465
Collateralized money invested
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 Guarantee	Shinhan Bank and others	Shinhan Bank and others	Shinhan Bank and others	Shinhan Bank and others
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		₩ 612
Collateralized money invested
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 Guarantee	Hana Bank and others	Hana Bank and others	Hana Bank and others	Hana Bank and others
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		₩ 11,191
Debt guarantees
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 Guarantee	Mizuho Bank	Mizuho Bank	Mizuho Bank	Mizuho Bank
Name of Principal obligor	PT. Cirebon Electric Power	PT. Cirebon Electric Power	PT. Cirebon Electric Power	PT. Cirebon Electric Power
Amount of guarantees | $	$ 9,955
Debt guarantees
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 Guarantee	SMBC	SMBC	SMBC	SMBC
Name of Principal obligor	PT Wampu Electric Power	PT Wampu Electric Power	PT Wampu Electric Power	PT Wampu Electric Power
Amount of guarantees | $	$ 4,817
Collateralized money invested
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 Guarantee	Hana Bank and others	Hana Bank and others	Hana Bank and others	Hana Bank and others
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		₩ 3,877
Guarantees for supplemental funding and others
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 Guarantee	IBK and others	IBK and others	IBK and others	IBK and others
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 | $	$ 0
Collateralized money invested
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 Guarantee	Woori Bank and others	Woori Bank and others	Woori Bank and others	Woori Bank and others
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		₩ 3,577
Collateralized money invested
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 Guarantee	Shinhan Bank and others	Shinhan Bank and others	Shinhan Bank and others	Shinhan Bank and others
Name of Principal obligor	KNH Solar Co., Ltd.	KNH Solar Co., Ltd.	KNH Solar Co., Ltd.	KNH Solar Co., Ltd.
Amount of guarantees		₩ 2,278
Collateralized money invested
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 Guarantee	Korea Development Bank and others	Korea Development Bank and others	Korea Development Bank and others	Korea Development Bank and others
Name of Principal obligor	Daeryun Power Co., Ltd.	Daeryun Power Co., Ltd.	Daeryun Power Co., Ltd.	Daeryun Power Co., Ltd.
Amount of guarantees		₩ 25,426
Collateralized money invested
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 Guarantee	IBK	IBK	IBK	IBK
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		₩ 1,927
Collateralized money invested
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 Guarantee	IBK and others	IBK and others	IBK and others	IBK and others
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		₩ 4,356
Collateralized money invested
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 Guarantee	Nonghyup Bank	Nonghyup Bank	Nonghyup Bank	Nonghyup Bank
Name of Principal obligor	Energyco Co., Ltd. (formerly, Energyco LLC)	Energyco Co., Ltd. (formerly, Energyco LLC)	Energyco Co., Ltd. (formerly, Energyco LLC)	Energyco Co., Ltd. (formerly, Energyco LLC)
Amount of guarantees		₩ 1,535
Collateralized money invested
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 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
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		₩ 5,411
Collateralized money invested
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 Guarantee	IBK	IBK	IBK	IBK
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		₩ 3,357
Collateralized money invested
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 Guarantee	Kookmin Bank and others	Kookmin Bank and others	Kookmin Bank and others	Kookmin Bank and others
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		₩ 7,360
Collateralized money invested
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 Guarantee	IBK and others	IBK and others	IBK and others	IBK and others
Name of Principal obligor	Naepo Green Energy Co., Ltd.	Naepo Green Energy Co., Ltd.	Naepo Green Energy Co., Ltd.	Naepo Green Energy Co., Ltd.
Amount of guarantees | $	$ 0
Guarantees for supplemental funding
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 Guarantee	Woori Bank	Woori Bank	Woori Bank	Woori Bank
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		₩ 1,856
Collateralized money invested
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 Guarantee	Shinhan Bank and others	Shinhan Bank and others	Shinhan Bank and others	Shinhan Bank and others
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		₩ 10,634
Collateralized money invested
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 Guarantee	Kookmin Bank	Kookmin Bank	Kookmin Bank	Kookmin Bank
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		₩ 6,053
Collateralized money invested
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 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
Name of Principal obligor	Kelar S.A.	Kelar S.A.	Kelar S.A.	Kelar S.A.
Amount of guarantees		₩ 86,695
Collateralized money invested
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 Guarantee	IBK	IBK	IBK	IBK
Name of Principal obligor	Chester Solar I SpA	Chester Solar I SpA	Chester Solar I SpA	Chester Solar I SpA
Amount of guarantees		₩ 1,120
Collateralized money invested
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 Guarantee	IBK	IBK	IBK	IBK
Name of Principal obligor	Chester Solar IV SpA	Chester Solar IV SpA	Chester Solar IV SpA	Chester Solar IV SpA
Amount of guarantees | $	$ 0
Collateralized money invested
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 Guarantee	IBK	IBK	IBK	IBK
Name of Principal obligor	Chester Solar V SpA	Chester Solar V SpA	Chester Solar V SpA	Chester Solar V SpA
Amount of guarantees		₩ 25
Collateralized money invested
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 Guarantee	Nonghyup Bank	Nonghyup Bank	Nonghyup Bank	Nonghyup Bank
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		₩ 911
Collateralized money invested
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 Guarantee	Nonghyup Bank	Nonghyup Bank	Nonghyup Bank	Nonghyup Bank
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		₩ 265
Collateralized money invested
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 Guarantee	Nonghyup Bank	Nonghyup Bank	Nonghyup Bank	Nonghyup Bank
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		₩ 289
Collateralized money invested
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 Guarantee	IBK	IBK	IBK	IBK
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		₩ 362
Collateralized money invested
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 Guarantee	IBK	IBK	IBK	IBK
Name of Principal obligor	Laurel SpA	Laurel SpA	Laurel SpA	Laurel SpA
Amount of guarantees		₩ 290
Collateralized money invested
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 Guarantee	IBK and others	IBK and others	IBK and others	IBK and others
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		₩ 233
Collateralized money invested
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 Guarantee	Korea Development Bank and others	Korea Development Bank and others	Korea Development Bank and others	Korea Development Bank and others
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		₩ 121,955
Guarantees for supplemental funding
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	KEPCO Plant Service & Engineering Co., Ltd.	KEPCO Plant Service & Engineering Co., Ltd.	KEPCO Plant Service & Engineering Co., Ltd.	KEPCO Plant Service & Engineering Co., Ltd.
Name Of Guarantee	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank
Name of Principal obligor	Incheon New Power Co., Ltd.	Incheon New Power Co., Ltd.	Incheon New Power Co., Ltd.	Incheon New Power Co., Ltd.
Amount of guarantees		₩ 0
Collateralized money invested
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 Guarantee	UniCredit Bulbank and others	UniCredit Bulbank and others	UniCredit Bulbank and others	UniCredit Bulbank and others
Name of Principal obligor	RES Technology AD	RES Technology AD	RES Technology AD	RES Technology AD
Amount of guarantees		₩ 16,703
Collateralized money invested
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 Guarantee	UniCredit Bulbank and others	UniCredit Bulbank and others	UniCredit Bulbank and others	UniCredit Bulbank and others
Name of Principal obligor	ASM-BG Investicii AD	ASM-BG Investicii AD	ASM-BG Investicii AD	ASM-BG Investicii AD
Amount of guarantees		₩ 18,692
Collateralized money invested
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 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
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		₩ 260,858
Collateralized money invested
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 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
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		₩ 2,288
Collateralized money invested
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 Guarantee	IBK	IBK	IBK	IBK
Name of Principal obligor	PND Solar Co., Ltd.	PND Solar Co., Ltd.	PND Solar Co., Ltd.	PND Solar Co., Ltd.
Amount of guarantees		₩ 1,229
Collateralized money invested
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 Guarantee	Samsung Life Insurance and others	Samsung Life Insurance and others	Samsung Life Insurance and others	Samsung Life Insurance and others
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		₩ 5,572
Collateralized money invested
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 Guarantee	IBK	IBK	IBK	IBK
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		₩ 1,958
Collateralized money invested
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 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
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		₩ 3,808
Collateralized money invested
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 Guarantee	Kookmin Bank and others	Kookmin Bank and others	Kookmin Bank and others	Kookmin Bank and others
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		₩ 6,838
Collateralized money invested
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 Guarantee	Shinhan Bank and others	Shinhan Bank and others	Shinhan Bank and others	Shinhan Bank and others
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		₩ 2,828
Collateralized money invested
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 Guarantee	Woori Bank and others	Woori Bank and others	Woori Bank and others	Woori Bank and others
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		₩ 10,238
Collateralized money invested
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 Guarantee	Hana Bank and others	Hana Bank and others	Hana Bank and others	Hana Bank and others
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		₩ 3,809
Collateralized money invested
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 Guarantee	Shinhan Bank and others	Shinhan Bank and others	Shinhan Bank and others	Shinhan Bank and others
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		₩ 5,033
Collateralized money invested
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 Guarantee	Kookmin Bank and others	Kookmin Bank and others	Kookmin Bank and others	Kookmin Bank and others
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		₩ 4,301
Collateralized money invested
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 Guarantee	Woori Bank and others	Woori Bank and others	Woori Bank and others	Woori Bank and others
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		₩ 4,106
Collateralized money invested
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 Guarantee	Shinhan Bank and others	Shinhan Bank and others	Shinhan Bank and others	Shinhan Bank and others
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		₩ 25,465
Collateralized money invested
Disclosure of Guarantees provided between the related parties [Line Items]
Name Of Guarantee	Shinhan Bank	Shinhan Bank	Shinhan Bank	Shinhan Bank
Collateralized money invested Guarantees For Supplemental Funding
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 Guarantee	Hana Bank and others	Hana Bank and others	Hana Bank and others	Hana Bank and others
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		₩ 396

Related Parties - Summary of _2

Related Parties - Summary of Guarantees Provided To Associates Or Joint Ventures (Parentheticals) (Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2021KRW (₩)
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	26,772
Impairment loss [Member] | Incheon New Power Co., Ltd [Member]
Disclosure of Guarantees provided between the related parties [Line Items]
Provision of guarantees or collateral by entity	461
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 De

Related Parties - Summary of Derivatives Transactions With Related Parties (Details) - 12 months ended Dec. 31, 2021 - Korea Development Bank SFr in Thousands, $ in Thousands, $ in Thousands, ₩ in Millions	KRW (₩)	USD ($)	HKD ($)	CHF (SFr)
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	1,227.80	1,227.80	1,227.80	1,227.80
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	1,206.60	1,206.60	1,206.60	1,206.60
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	1,181.70	1,181.70	1,181.70	1,181.70
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	1,111.90	1,111.90	1,111.90	1,111.90
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	1,116.10	1,116.10	1,116.10	1,116.10
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	1,135.20	1,135.20	1,135.20	1,135.20
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	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	1,189.10	1,189.10	1,189.10	1,189.10
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2019~2022	2019~2022	2019~2022	2019~2022
Pay, Contract Amount	₩ 112,650
Receive, Contract Amount | $		$ 100,000
Contract Interest rate Pay	1.80	1.80	1.80	1.80
Contract Interest rate Receive	3.38	3.38	3.38	3.38
Contract exchange rate	1,126.50	1,126.50	1,126.50	1,126.50
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	1,142.30	1,142.30	1,142.30	1,142.30
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	1,069.60	1,069.60	1,069.60	1,069.60
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2019~2022	2019~2022	2019~2022	2019~2022
Pay, Contract Amount	₩ 117,340
Receive, Contract Amount | $		$ 100,000
Contract Interest rate Pay	1.06	1.06	1.06	1.06
Contract Interest rate Receive	2.38	2.38	2.38	2.38
Contract exchange rate	1,173.40	1,173.40	1,173.40	1,173.40
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2017~2022	2017~2022	2017~2022	2017~2022
Pay, Contract Amount	₩ 113,300
Receive, Contract Amount | $		$ 100,000
Contract Interest rate Pay	1.94	1.94	1.94	1.94
Contract Interest rate Receive	2.63	2.63	2.63	2.63
Contract exchange rate	1,133	1,133	1,133	1,133
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	1,128.90	1,128.90	1,128.90	1,128.90
Cross Currency Forward Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Pay, Contract Amount	₩ 59,049
Receive, Contract Amount | $		$ 50,050
Contract exchange rate	1,179.80	1,179.80	1,179.80	1,179.80
Contract date	Sep. 27, 2021	Sep. 27, 2021	Sep. 27, 2021	Sep. 27, 2021
Matrurity date	Jan. 7, 2022	Jan. 7, 2022	Jan. 7, 2022	Jan. 7, 2022

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, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of Key management personnel compensation [Abstract]
Salaries	₩ 1,272	₩ 1,295	₩ 1,315
Retirement benefits	21	58	31
Total	₩ 1,293	₩ 1,353	₩ 1,346

Statement of Cash Flows - Summa

Statement of Cash Flows - Summary of Significant Non-cash Activities (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Transfer from construction-in-progress to other assets
Non Cash Transactions [Line Items]
Non-cash transactions	₩ 12,902,589	₩ 10,189,527	₩ 14,052,094
Recognition of asset retirement cost and related provision for decommissioning costs
Non Cash Transactions [Line Items]
Non-cash transactions	2,356,805	895,507	2,425,668
Transfer from provision for disposal of spent nuclear fuel to accrued expenses
Non Cash Transactions [Line Items]
Non-cash transactions	455,401	395,921	376,103
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	11,109,271	9,237,883	7,759,284
Transfer from inventory to stored nuclear fuel
Non Cash Transactions [Line Items]
Non-cash transactions	908,842	1,055,974	1,129,374
Transfer of right-of-use assets due to change in accounting policy
Non Cash Transactions [Line Items]
Non-cash transactions	₩ 78,213	₩ 291,334	₩ 5,364,647

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, 2021	Dec. 31, 2020
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance	₩ 74,345,677	₩ 72,946,674
Cash flows	9,081,358	1,924,810
Increase	73,090	275,686
Effect of exchange rate fluctuations and others	1,439,891	(801,493)
Ending balance	84,940,016	74,345,677
Borrowings and debt securities
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance	69,724,581	67,876,541
Cash flows	9,653,394	2,538,787
Increase	0	0
Effect of exchange rate fluctuations and others	1,151,538	(690,747)
Ending balance	80,529,513	69,724,581
Lease liabilities
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance	4,621,096	5,070,133
Cash flows	(572,036)	(613,977)
Increase	73,090	275,686
Effect of exchange rate fluctuations and others	288,353	(110,746)
Ending balance	₩ 4,410,503	₩ 4,621,096

Commitments for Expenditure - S

Commitments for Expenditure - Summary of Commitments For Acquisition of Property, Plant and Equipment (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2021	Dec. 31, 2020
Purchase of cable (PVC,1C,2000SQ) 153,000M and others (Shin-Bupyung-Youngseo)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	₩ 57,046	₩ 56,574
Commitments for Expenditure Remaining liability balances	16,240	16,038
Purchase of cable (PVC, 1C, 2500SQ) 103,374M and others (Bukdangjin-Shintangjung)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	46,616	45,390
Commitments for Expenditure Remaining liability balances	34,102	32,876
Purchase of GIS (362KV 6300A 63KA) 23CB - YoungseoS/S
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	36,143	36,143
Commitments for Expenditure Remaining liability balances	25,292	29,898
Purchase of GIS (362kV, 6300A, 63kA) 26CB - Hwasung S/S
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	40,010	40,010
Commitments for Expenditure Remaining liability balances	5,540	8,328
Purchase of GIS (362KV 6300A 63KA) 27CB - KwangyangS/S
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	37,744	37,744
Commitments for Expenditure Remaining liability balances	140	2,244
Purchase of cable (FR CNCO-W,1C,325SQ) 1,400,000
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	0	59,716
Commitments for Expenditure Remaining liability balances	0	37,249
Purchase of switch (Eco) 9,360 units
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	0	40,631
Commitments for Expenditure Remaining liability balances	0	24,031
Purchase of cable (TR CNCE-W,1C,600SQ) 551,200M
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	0	37,288
Commitments for Expenditure Remaining liability balances	0	23,100
Purchase of cable (TR CNCE-W/AL,1C,400SQ) 4,464,000M
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	0	82,622
Commitments for Expenditure Remaining liability balances	0	51,130
Purchase of cable (FR CNCO-W,1C,325SQ) 1,092,000M
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	0	42,068
Commitments for Expenditure Remaining liability balances	0	35,358
Concrete pole (10M, general purpose, 350KGF) 102,435 ea and five other equipments
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	0	91,889
Commitments for Expenditure Remaining liability balances	0	80,904
Purchase of cable (PVC, 1C, 2500SQ) 100,548M and others
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	56,860	0
Commitments for Expenditure Remaining liability balances	34,576	0
Purchase of GIS (362kV, 6300A, 63kA) 25CB – Migeum S/S
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	32,000	0
Commitments for Expenditure Remaining liability balances	26,700	0
Advanced E-Type low-pressure electronic power meter 1,320,000 ea
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	65,972	0
Commitments for Expenditure Remaining liability balances	23,262	0
Purchase of cable (PVC, 1C, 2000SQ) 5,862M and others (Baekun-Gwangyanghang)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	34,423	0
Commitments for Expenditure Remaining liability balances	23,297	0
Purchase of cable (TR CNCE- W,1C,325SQ) 1,016,000M
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	66,581	0
Commitments for Expenditure Remaining liability balances	40,254	0
Purchase of cable (TR CNCE-W,1C,600SQ) 485,000M
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	46,194	0
Commitments for Expenditure Remaining liability balances	37,810	0
Purchase of cable (TR CNCE-W/AL,1C,400SQ) 3,303,900M
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	87,382	0
Commitments for Expenditure Remaining liability balances	83,628	0
Concrete pole (10M, general purpose, 350KGF) 126,948 ea and five other equipments
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	188,338	0
Commitments for Expenditure Remaining liability balances	168,456	0
Purchase of GIS (362KV, 6300A, 63KA) 25 – Shinyangsan S/S
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	31,464
Commitments for Expenditure Remaining liability balances	31,464
Construction of Shin-Kori Units (#5,6)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	9,800,424	8,625,387
Commitments for Expenditure Remaining liability balances	3,479,667	3,256,117
Construction of Shin-Hanul Units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	9,745,123	9,443,635
Commitments for Expenditure Remaining liability balances	0	160,512
Other 30 contracts
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	792,485	107,586
Commitments for Expenditure Remaining liability balances	620,593	58,466
Service of designing Seoul Combined Units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	31,841	31,841
Commitments for Expenditure Remaining liability balances	934	984
Service of designing Shin-Boryeong Units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	121,114	121,163
Commitments for Expenditure Remaining liability balances	0	521
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	7,722	29,042
Purchase of turbine generator for construction of Shin-Seocheon Thermal Power Plant
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	105,226	105,226
Commitments for Expenditure Remaining liability balances	6,301	8,279
Electricity construction of Shin-Seocheon Thermal Power Plant
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	340,356	282,234
Commitments for Expenditure Remaining liability balances	0	13,524
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	10,972	11,182
Service of designing Taean Units (#9,10)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	112,909	112,813
Commitments for Expenditure Remaining liability balances	12,623	12,933
Purchase of gas turbines and turbine equipment of Gimpo Combined Heat & Power Plant
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	126,302	104,600
Commitments for Expenditure Remaining liability balances	61,735	41,840
Purchase of steam turbine, HRSG and Popwer Block of Gimpo Combined Heat & Power Plant
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	214,053	210,900
Commitments for Expenditure Remaining liability balances	138,244	147,630
Construction of Gimpo Combined Heat & Power Plant
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	130,015	0
Commitments for Expenditure Remaining liability balances	86,323	0
Purchase of coal handling machine for construction of Samcheok Units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	286,571	285,158
Commitments for Expenditure Remaining liability balances	6,215	22,751
Purchase of furnace main equipment for construction of Samcheok Units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	0	1,065,141
Commitments for Expenditure Remaining liability balances	0	11,609
Purchase of turbine main equipment for Samcheok Units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	0	211,349
Commitments for Expenditure Remaining liability balances	0	125
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	112
Purchase of main equipment for Shin-Sejong Combined Thermal Power Plant
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	234,392	0
Commitments for Expenditure Remaining liability balances	₩ 200,122	₩ 0

Commitments for Expenditure -_2

Commitments for Expenditure - Summary of Commitments For Inventory Purchase (Details)	12 Months Ended
	Dec. 31, 2021
Concentrate
Disclosure of contracts for inventory purchase commitment [Line Items]
Periods	2020 ~ 2030
Contracted amounts	32,435 Ton U3O8
Transformed
Disclosure of contracts for inventory purchase commitment [Line Items]
Periods	2020 ~ 2030
Contracted amounts	18,088 Ton U
Enrichment
Disclosure of contracts for inventory purchase commitment [Line Items]
Periods	2020 ~ 2030
Contracted amounts	17,667 Ton SWU

Contingencies and Commitments -

Contingencies and Commitments - Summary of Ongoing Litigations Related With Contingent Liabilities And Contingent Assets (Details) ₩ in Millions	Dec. 31, 2021KRW (₩)	Dec. 31, 2020KRW (₩)
As the defendant
Litigation Case [Line Items]
Number of cases	683	663
Claim amount	₩ 689,415	₩ 550,535
As the plaintiff
Litigation Case [Line Items]
Number of cases	284	200
Claim amount	₩ 784,453	₩ 729,798

Contingencies and Commitments_2

Contingencies and Commitments - Summary of Credit Lines Provided By Financial Institutions (Details) - 12 months ended Dec. 31, 2021 ₱ 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 ($)	JPY (¥)	EUR (€)	INR (₨)	SAR (ر.س)	MXN ($)	AED (د.إ)
Commitments on bank-overdraft
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Nonghyup Bank and others
Credit Limit | ₩	₩ 1,815,500
Used amount | ₩	₩ 208,018
Commitments on bank-daylight overdraft
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Nonghyup Bank
Credit Limit | ₩	₩ 280,000
Used amount | ₩	₩ 0
Limit amount available for CP
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank and others
Credit Limit | ₩	₩ 1,050,000
Used amount | ₩	₩ 1,050,000
Limit amount available for card
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank
Credit Limit | ₩	₩ 47,404
Used amount | ₩	₩ 5,529
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	Kookmin Bank and others
Credit Limit | ₩	₩ 1,780,028
Used amount | ₩	₩ 1,319,181
Loan limit
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	DBS Bank Ltd and others
Credit Limit			$ 1,644,700
Used amount			167,533
Certification of payment on payables from foreign country
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Nonghyup Bank
Credit Limit			8,700
Used amount			7,213
Certification of payment on L/C
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Shinhan Bank and others
Credit Limit			1,019,834
Used amount			463,355
Certification of payment on L/C
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Shinhan Bank
Credit Limit | ¥				¥ 707,337
Certification of payment on L/C
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank and others
Credit Limit | €					€ 48,122
Used amount | €					41,262
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Seoul Guarantee Insurance and others
Credit Limit | ₩	₩ 104,705
Used amount | ₩	₩ 96,658
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	First Abu Dhabi Bank and others
Credit Limit			947,707
Used amount			682,903
Certification of performance guarantee on contract
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 contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank
Credit Limit | €					3,965
Used amount | €					€ 3,965
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Shinhan Bank
Credit Limit | ₨						₨ 51,678
Used amount | ₨						₨ 51,678
Certification of bidding
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank
Credit Limit			5,200
Used amount			197
Advance payment bond, Warranty bond, Retention bond and others
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Seoul Guarantee Insurance
Credit Limit | ₩	₩ 49,874
Used amount | ₩	₩ 49,874
Advance payment bond, Warranty bond, Retention bond and others
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank and others
Credit Limit			331,072
Used amount			286,388
Advance payment bond, Warranty bond, Retention bond and others
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank
Credit Limit | ر.س							ر.س 6,508
Used amount | ر.س							ر.س 6,508
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 | ₩	₩ 610,983
Used amount | ₩	₩ 29,730
Other commitments
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Export-Import Bank of Korea and others
Credit Limit			2,625,372
Used amount			1,842,173
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
Inclusive credit
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank
Credit Limit | ₩	₩ 8,000
Used amount | ₩	₩ 825
Inclusive credit
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank and others
Credit Limit			135,078
Used amount			15,633
Trade finance
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Export-Import Bank of Korea and others
Credit Limit			850,000
Used amount			$ 149,328

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, 2021 JD in Thousands, $ in Thousands, ₩ in Millions		USD ($)	KRW (₩)	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
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			396,120
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
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
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 236,570
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
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			221,631
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		TS Energy No. 25 Co., Ltd.
Name of Guarantee		Kyobo Life Insurance Co., Ltd. and others
Value of collateral			₩ 521,281
Description of assets pledged as collateral description	[2]	Collateral for borrowings
[1]	Based on the credit limits of the respective loans.
[2]	As of December 31, 2021, 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	May 18, 2015Individuals	Dec. 31, 2021KRW (₩)Individuals	Dec. 31, 2021USD ($)Individuals	Dec. 31, 2021USD ($)	Dec. 31, 2021IDR (Rp)	Dec. 31, 2021EUR (€)	Dec. 31, 2020KRW (₩)
Detailed Information About Commitments [Line Items]
Borrowings | ₩		₩ 6,662,747					₩ 5,133,802
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 35,907,215
ExportImport Bank of Korea [Member]
Detailed Information About Commitments [Line Items]
Maximum Performance Guarantee Amount				12,090
Other Borrowings Guarantee Amount				5,911
PT. Cirebon Energi Prasarana
Detailed Information About Commitments [Line Items]
Maximum Performance Guarantee Amount				43,500
Van Phong Power Company Ltd [Member]
Detailed Information About Commitments [Line Items]
Maximum Performance Guarantee Amount				5,000
Morgan Stanley Capital Group Inc [Member]
Detailed Information About Commitments [Line Items]
Maximum Performance Guarantee Amount				30,000
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]
Detailed Information About Commitments [Line Items]
Other Borrowings Guarantee Amount				60,000
Primoris Renewable Energy, Inc [Member]
Detailed Information About Commitments [Line Items]
Maximum Performance Guarantee Amount				76,700
PT. Cirebon Electro Power [Member]
Detailed Information About Commitments [Line Items]
Maximum Performance Guarantee Amount				54,000
Gaesong Industrial Complex [Member]
Detailed Information About Commitments [Line Items]
Book value of facility | ₩		14,451
Trade receivables | ₩		2,911
Next Energy Co Ltd [Member]
Detailed Information About Commitments [Line Items]
Contractual capital commitments | ₩		14,700
Gangneung [Member]
Detailed Information About Commitments [Line Items]
Suspended operations of plant carrying amount | ₩		68,674
Expenses related to suspension of operations | ₩		44
Depreaciation on idle assets | ₩		3,621
Export Import Bank Of Korea [Member]
Detailed Information About Commitments [Line Items]
Guarantee provided for mutual investments				2,192
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
Top of range [member]
Detailed Information About Commitments [Line Items]
Guarantee provided for investments				43,500
Top of range [member] | Perusahaan Listik Negara [Member]
Detailed Information About Commitments [Line Items]
Business performance guarantees				2,293
Top of range [member] | MUFG Bank Ltd [Member]
Detailed Information About Commitments [Line Items]
Guarantee provided for borrowings				41,258
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
Extending The Operation Of Wolsong Unit [Member]
Detailed Information About Commitments [Line Items]
Number of individuals filed lawsuit | Individuals	2,167
Contribution To Plan Assets [Member]
Detailed Information About Commitments [Line Items]
Number of individuals filed lawsuit | Individuals		3,910	3,910
Provision for loss contingencies | ₩		₩ 11,730
Ordinary Wages And Unpaid Wages [Member]
Detailed Information About Commitments [Line Items]
Provision for loss contingencies | ₩		₩ 3,233

Business Combination - Disclosu

Business Combination - Disclosure of Detailed Information About Business Combination (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2019
Disclosure of detailed information about business combination [line items]
Company		Eumseong Natural Gas Power Co., Ltd.
Key operation activities		Power generation
Date of merger		Dec. 23, 2019
Percentage of voting equity interests acquired		100.00%
Description of how acquirer obtained control of acquiree		Eumseong Natural Gas Power Co., Ltd. was established in August 2019 by spin-off from Dangjin Eco Power Co., Ltd., and obtained the license for LNG combined power generation under the 8th Basic Plan for Long-Term Electricity Supply and Demand. Korea East-West Power Co., Ltd., a subsidiary of the Company, acquired 100% of its interest in Eumseong Natural Gas Power Co., Ltd. for stable power supply and profit generation through diversification of power sources, and merged with Eumseong Natural Gas Power Co., Ltd. on December 23, 2019.
Description of valuation techniques and significant inputs used to measure non-controlling interest in acquiree measured at fair value		Goodwill arose from the business combination due to the transfer price including the premium to obtain control paid in order to acquire Eumseong Natural Gas Power Co., Ltd. It also includes expectation of synergy effect and future growth in profits derived from business combination with LNG combined power generation project. These business rights can be separated from goodwill which satisfies the recognition requirements and thus the business rights have been recognized as a separate intangible asset. On the contrary, the expected benefits such as direct fuel acquisition and reduce costs for O&M did not satisfy the recognition requirements for identifiable intangible assets and thus were not recognized separately from the goodwill.
Description of line item of statement of comprehensive income in which gain or loss as result of remeasuring to fair value equity interest is recognised		There is no sale or net profit included in the statement of comprehensive income (loss) for the year ended December 31, 2019, in relation to additional business launched by Eumseong Natural Gas Power Co., Ltd.
Acquisition-date fair value of total consideration transferred [abstract]
Cash and cash equivalents	[1]	₩ 166,700
Fair value of the shares owned before the acquisition		59,058
Fair value of transfer price		225,758
Outstanding payments received			₩ 10,000
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract]
Cash and cash equivalents		2,389
Trade and other receivables		55
Property, plant and equipment		54
Intangible assets		172,434
Other assets		60
Borrowings		(2,900)
Deferred tax liabilities		(41,729)
Less : Fair value of the identifiable net assets		(130,363)
Goodwill recognised as of acquisition date		₩ 95,395
[1]	The outstanding payment of ￦10,000 million as of December 31, 2019, has been received during the current year.

Business Combination - Summary

Business Combination - Summary of Net cash Outflows From The Business Combination (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of Net cash outflows from the business combination [Abstract]
Cash paid for the acquisition	₩ 10,000	₩ 156,700
Less : Cash and cash equivalents received	0	(2,389)
Net cash outflows from the business combination	₩ 10,000	₩ 154,311

Business Combination - Disclo_2

Business Combination - Disclosure of Transactions Recognised Separately From Acquisition of Assets and Assumption of Liabilities in Business Combination (Details) - Business combinations [member] ₩ in Millions	12 Months Ended
	Dec. 31, 2021KRW (₩)
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]
Description of transaction recognised separately from acquisition of assets and assumption of liabilities in business combination	(6) Fees for legal service, due diligence and others relating to the business combination amounted to ￦24 million. The fees were excluded from the transfer price and recognized as selling and administrative expenses in the statement of comprehensive income (loss) for the year ended December 31, 2019.
Acquisition-related costs for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination	₩ 24

Subsequent Events - Summary of

Subsequent Events - Summary of Subsequent Events (Details) - 12 months ended Dec. 31, 2021 ₩ in Millions, $ in Millions	KRW (₩)	USD ($)
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
1117 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Jan. 4, 2022
Maturiy	Jan. 4, 2025
Interest rate (%)	2.33%
Amounts issued for the subsequent period	₩ 150,000
1118 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Jan. 4, 2022
Maturiy	Jan. 4, 2027
Interest rate (%)	2.53%
Amounts issued for the subsequent period	₩ 200,000
1119 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Jan. 6, 2022
Maturiy	Jan. 6, 2029
Interest rate (%)	2.75%
Amounts issued for the subsequent period	₩ 200,000
1120 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Jan. 6, 2022
Maturiy	Jan. 6, 2032
Interest rate (%)	2.83%
Amounts issued for the subsequent period	₩ 100,000
1121 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Jan. 10, 2022
Maturiy	Jan. 10, 2025
Interest rate (%)	2.50%
Amounts issued for the subsequent period	₩ 270,000
1122 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Jan. 10, 2022
Maturiy	Jan. 10, 2029
Interest rate (%)	2.83%
Amounts issued for the subsequent period	₩ 200,000
1123 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Jan. 12, 2022
Maturiy	Jan. 12, 2027
Interest rate (%)	2.69%
Amounts issued for the subsequent period	₩ 280,000
1124 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Jan. 12, 2022
Maturiy	Jan. 12, 2032
Interest rate (%)	2.90%
Amounts issued for the subsequent period	₩ 120,000
1125 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Jan. 19, 2022
Maturiy	Jan. 19, 2025
Interest rate (%)	2.58%
Amounts issued for the subsequent period	₩ 160,000
1126 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Jan. 19, 2022
Maturiy	Jan. 19, 2029
Interest rate (%)	2.92%
Amounts issued for the subsequent period	₩ 100,000
1127 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Jan. 25, 2022
Maturiy	Jan. 25, 2027
Interest rate (%)	2.80%
Amounts issued for the subsequent period	₩ 150,000
1128 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Jan. 25, 2022
Maturiy	Jan. 25, 2032
Interest rate (%)	2.98%
Amounts issued for the subsequent period	₩ 100,000
1129 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Jan. 27, 2022
Maturiy	Jan. 27, 2025
Interest rate (%)	2.70%
Amounts issued for the subsequent period	₩ 190,000
1130 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Jan. 27, 2022
Maturiy	Jan. 27, 2029
Interest rate (%)	2.99%
Amounts issued for the subsequent period	₩ 140,000
1131 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Feb. 4, 2022
Maturiy	Feb. 4, 2027
Interest rate (%)	2.97%
Amounts issued for the subsequent period	₩ 190,000
1132 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Feb. 4, 2022
Maturiy	Feb. 4, 2032
Interest rate (%)	3.05%
Amounts issued for the subsequent period	₩ 160,000
1133 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Feb. 8, 2022
Maturiy	Feb. 8, 2025
Interest rate (%)	2.80%
Amounts issued for the subsequent period	₩ 150,000
1134 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Feb. 8, 2022
Maturiy	Feb. 8, 2029
Interest rate (%)	3.10%
Amounts issued for the subsequent period	₩ 140,000
1135 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Feb. 10, 2022
Maturiy	Feb. 10, 2027
Interest rate (%)	3.03%
Amounts issued for the subsequent period	₩ 300,000
1136 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Feb. 10, 2022
Maturiy	Feb. 10, 2032
Interest rate (%)	3.17%
Amounts issued for the subsequent period	₩ 70,000
1137 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Feb. 14, 2022
Maturiy	Feb. 14, 2025
Interest rate (%)	2.89%
Amounts issued for the subsequent period	₩ 200,000
1138 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Feb. 14, 2022
Maturiy	Feb. 14, 2029
Interest rate (%)	3.19%
Amounts issued for the subsequent period	₩ 90,000
1139 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Feb. 18, 2022
Maturiy	Feb. 18, 2025
Interest rate (%)	2.86%
Amounts issued for the subsequent period	₩ 180,000
1140 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Feb. 18, 2022
Maturiy	Feb. 18, 2027
Interest rate (%)	3.08%
Amounts issued for the subsequent period	₩ 110,000
1141 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Feb. 22, 2022
Maturiy	Feb. 22, 2025
Interest rate (%)	2.93%
Amounts issued for the subsequent period	₩ 160,000
1142 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Feb. 22, 2022
Maturiy	Feb. 22, 2027
Interest rate (%)	3.15%
Amounts issued for the subsequent period	₩ 130,000
1143 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Feb. 25, 2022
Maturiy	Feb. 25, 2025
Interest rate (%)	2.82%
Amounts issued for the subsequent period	₩ 120,000
1144 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Feb. 25, 2022
Maturiy	Feb. 25, 2027
Interest rate (%)	3.09%
Amounts issued for the subsequent period	₩ 40,000
1145 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 2, 2022
Maturiy	Mar. 2, 2025
Interest rate (%)	2.85%
Amounts issued for the subsequent period	₩ 150,000
1146 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 2, 2022
Maturiy	Mar. 2, 2027
Interest rate (%)	3.12%
Amounts issued for the subsequent period	₩ 160,000
1147 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 4, 2022
Maturiy	Mar. 4, 2025
Interest rate (%)	2.84%
Amounts issued for the subsequent period	₩ 190,000
1148 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 4, 2022
Maturiy	Mar. 4, 2027
Interest rate (%)	3.12%
Amounts issued for the subsequent period	₩ 90,000
1149 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 4, 2022
Maturiy	Mar. 4, 2029
Interest rate (%)	3.15%
Amounts issued for the subsequent period	₩ 20,000
1150 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 7, 2022
Maturiy	Mar. 7, 2025
Interest rate (%)	2.82%
Amounts issued for the subsequent period	₩ 160,000
1151 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 7, 2022
Maturiy	Mar. 7, 2027
Interest rate (%)	3.11%
Amounts issued for the subsequent period	₩ 90,000
1152 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 7, 2022
Maturiy	Mar. 7, 2029
Interest rate (%)	3.15%
Amounts issued for the subsequent period	₩ 50,000
1153 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 10, 2022
Maturiy	Mar. 10, 2025
Interest rate (%)	2.88%
Amounts issued for the subsequent period	₩ 170,000
1154 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 10, 2022
Maturiy	Mar. 10, 2027
Interest rate (%)	3.10%
Amounts issued for the subsequent period	₩ 130,000
1155 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 16, 2022
Maturiy	Mar. 16, 2025
Interest rate (%)	2.89%
Amounts issued for the subsequent period	₩ 210,000
1156 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 16, 2022
Maturiy	Mar. 16, 2027
Interest rate (%)	3.10%
Amounts issued for the subsequent period	₩ 130,000
1157 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 18, 2022
Maturiy	Mar. 18, 2025
Interest rate (%)	2.93%
Amounts issued for the subsequent period	₩ 180,000
1158 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 18, 2022
Maturiy	Mar. 18, 2027
Interest rate (%)	3.09%
Amounts issued for the subsequent period	₩ 180,000
1159 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 24, 2022
Maturiy	Mar. 24, 2024
Interest rate (%)	2.73%
Amounts issued for the subsequent period	₩ 160,000
1160 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 24, 2022
Maturiy	Mar. 24, 2027
Interest rate (%)	3.29%
Amounts issued for the subsequent period	₩ 80,000
1161 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 28, 2022
Maturiy	Mar. 28, 2052
Interest rate (%)	3.30%
Amounts issued for the subsequent period	₩ 130,000
1162 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 30, 2022
Maturiy	Mar. 30, 2024
Interest rate (%)	3.01%
Amounts issued for the subsequent period	₩ 100,000
1163 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 30, 2022
Maturiy	Mar. 30, 2025
Interest rate (%)	3.35%
Amounts issued for the subsequent period	₩ 60,000
1164 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Mar. 30, 2022
Maturiy	Mar. 30, 2027
Interest rate (%)	3.49%
Amounts issued for the subsequent period	₩ 30,000
1165 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 1, 2022
Maturiy	Apr. 1, 2024
Interest rate (%)	3.07%
Amounts issued for the subsequent period	₩ 150,000
1166 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 1, 2022
Maturiy	Apr. 1, 2025
Interest rate (%)	3.45%
Amounts issued for the subsequent period	₩ 160,000
1167 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 1, 2022
Maturiy	Apr. 1, 2032
Interest rate (%)	3.50%
Amounts issued for the subsequent period	₩ 10,000
1168 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 5, 2022
Maturiy	Apr. 5, 2024
Interest rate (%)	3.19%
Amounts issued for the subsequent period	₩ 130,000
1169 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 5, 2022
Maturiy	Apr. 5, 2025
Interest rate (%)	3.46%
Amounts issued for the subsequent period	₩ 70,000
1170 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 5, 2022
Maturiy	Apr. 5, 2027
Interest rate (%)	3.61%
Amounts issued for the subsequent period	₩ 70,000
1171 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 7, 2022
Maturiy	Apr. 7, 2024
Interest rate (%)	3.36%
Amounts issued for the subsequent period	₩ 100,000
1172 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 7, 2022
Maturiy	Apr. 7, 2025
Interest rate (%)	3.58%
Amounts issued for the subsequent period	₩ 50,000
1173 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 7, 2022
Maturiy	Apr. 7, 2027
Interest rate (%)	3.70%
Amounts issued for the subsequent period	₩ 20,000
1174 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 11, 2022
Maturiy	Apr. 11, 2024
Interest rate (%)	3.65%
Amounts issued for the subsequent period	₩ 160,000
1175 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 11, 2022
Maturiy	Apr. 11, 2025
Interest rate (%)	3.71%
Amounts issued for the subsequent period	₩ 40,000
1176 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 11, 2022
Maturiy	Apr. 11, 2027
Interest rate (%)	3.84%
Amounts issued for the subsequent period	₩ 10,000
1177 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 15, 2022
Maturiy	Apr. 15, 2024
Interest rate (%)	3.55%
Amounts issued for the subsequent period	₩ 230,000
1178 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 15, 2022
Maturiy	Apr. 15, 2025
Interest rate (%)	3.70%
Amounts issued for the subsequent period	₩ 60,000
1179 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 15, 2022
Maturiy	Apr. 15, 2027
Interest rate (%)	3.72%
Amounts issued for the subsequent period	₩ 10,000
1180 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 19, 2022
Maturiy	Oct. 19, 2023
Interest rate (%)	3.29%
Amounts issued for the subsequent period	₩ 230,000
1181 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 19, 2022
Maturiy	Apr. 19, 2025
Interest rate (%)	3.70%
Amounts issued for the subsequent period	₩ 80,000
1182 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 21, 2022
Maturiy	Oct. 21, 2023
Interest rate (%)	3.19%
Amounts issued for the subsequent period	₩ 200,000
1183 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 21, 2022
Maturiy	Apr. 21, 2025
Interest rate (%)	3.71%
Amounts issued for the subsequent period	₩ 150,000
1184 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 21, 2022
Maturiy	Apr. 21, 2052
Interest rate (%)	3.72%
Amounts issued for the subsequent period	₩ 100,000
1185 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 26, 2022
Maturiy	Apr. 26, 2024
Interest rate (%)	3.30%
Amounts issued for the subsequent period	₩ 130,000
1186 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 26, 2022
Maturiy	Apr. 26, 2025
Interest rate (%)	3.65%
Amounts issued for the subsequent period	₩ 130,000
1187 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 26, 2022
Maturiy	Apr. 26, 2027
Interest rate (%)	3.77%
Amounts issued for the subsequent period	₩ 60,000
1188 Corporate bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 28, 2022
Maturiy	Apr. 28, 2024
Interest rate (%)	3.35%
Amounts issued for the subsequent period	₩ 210,000
1189 Corporate bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 28, 2022
Maturiy	Apr. 28, 2025
Interest rate (%)	3.70%
Amounts issued for the subsequent period	₩ 260,000
1190 Corporate bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Electric Power Corporation
Issue date	Apr. 28, 2022
Maturiy	Apr. 28, 2027
Interest rate (%)	3.77%
Amounts issued for the subsequent period	₩ 30,000
63-1 Corporate bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Hydro & Nuclear Power Co., Ltd.
Issue date	Feb. 17, 2022
Maturiy	Feb. 17, 2027
Interest rate (%)	2.81%
Amounts issued for the subsequent period	₩ 40,000
63-2 Corporate bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Hydro & Nuclear Power Co., Ltd.
Issue date	Feb. 17, 2022
Maturiy	Feb. 17, 2042
Interest rate (%)	3.04%
Amounts issued for the subsequent period	₩ 60,000
63-3 Corporate bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Hydro & Nuclear Power Co., Ltd.
Issue date	Feb. 17, 2022
Maturiy	Feb. 17, 2052
Interest rate (%)	2.97%
Amounts issued for the subsequent period	₩ 50,000
64-1 Corporate bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Hydro & Nuclear Power Co., Ltd.
Issue date	Mar. 11, 2022
Maturiy	Mar. 11, 2042
Interest rate (%)	3.10%
Amounts issued for the subsequent period	₩ 70,000
64-2 Corporate bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Hydro & Nuclear Power Co., Ltd.
Issue date	Mar. 11, 2022
Maturiy	Mar. 11, 2052
Interest rate (%)	3.02%
Amounts issued for the subsequent period	₩ 80,000
65-1 Corporate bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Hydro & Nuclear Power Co., Ltd.
Issue date	Apr. 22, 2022
Maturiy	Apr. 22, 2027
Interest rate (%)	3.68%
Amounts issued for the subsequent period	₩ 30,000
65-2 Corporate bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Hydro & Nuclear Power Co., Ltd.
Issue date	Apr. 22, 2022
Maturiy	Apr. 22, 2042
Interest rate (%)	3.84%
Amounts issued for the subsequent period	₩ 60,000
65-3 Corporate bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Hydro & Nuclear Power Co., Ltd.
Issue date	Apr. 22, 2022
Maturiy	Apr. 22, 2052
Interest rate (%)	3.72%
Amounts issued for the subsequent period	₩ 20,000
Corporate bonds
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea South-East Power Co., Ltd.
Issue date	Mar. 28, 2022
Maturiy	Mar. 28, 2027
Interest rate (%)	3.30%
Amounts issued for the subsequent period	₩ 10,000
Corporate Bonds - 1
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea South-East Power Co., Ltd.
Issue date	Mar. 28, 2022
Maturiy	Mar. 28, 2052
Interest rate (%)	3.13%
Amounts issued for the subsequent period	₩ 40,000
Corporate Bonds - 2
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea South-East Power Co., Ltd.
Issue date	Mar. 28, 2022
Maturiy	Mar. 28, 2025
Interest rate (%)	3.24%
Amounts issued for the subsequent period	₩ 90,000
65-1 non-guaranteed Corporate bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Midland Power Co., Ltd.
Issue date	Jan. 17, 2022
Maturiy	Jan. 17, 2032
Interest rate (%)	2.85%
Amounts issued for the subsequent period	₩ 10,000
65-2 non-guaranteed Corporate bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Midland Power Co., Ltd.
Issue date	Jan. 17, 2022
Maturiy	Jan. 17, 2042
Interest rate (%)	2.83%
Amounts issued for the subsequent period	₩ 10,000
66-1 non-guaranteed Corporate bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Midland Power Co., Ltd.
Issue date	Jan. 24, 2022
Maturiy	Jan. 24, 2025
Interest rate (%)	2.83%
Amounts issued for the subsequent period	₩ 40,000
66-2 non-guaranteed Corporate bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Midland Power Co., Ltd.
Issue date	Jan. 24, 2022
Maturiy	Jan. 24, 2027
Interest rate (%)	2.95%
Amounts issued for the subsequent period	₩ 30,000
66-3 non-guaranteed Corporate bond
Disclosure of non-adjusting events after reporting period [line items]
Issue date	Jan. 24, 2022
Maturiy	Jan. 24, 2052
Interest rate (%)	2.87%
Amounts issued for the subsequent period	₩ 50,000
67 non-guaranteed Corporate bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Midland Power Co., Ltd.
Issue date	Feb. 17, 2022
Maturiy	Feb. 17, 2052
Interest rate (%)	3.01%
Amounts issued for the subsequent period	₩ 40,000
9 Foreign Currency Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Midland Power Co., Ltd.
Issue date	Apr. 21, 2022
Maturiy	Apr. 21, 2027
Interest rate (%)	3.63%
Amounts issued for the subsequent period | $		$ 300,000
51-1 Corporate bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Western Power Co., Ltd.
Issue date	Jan. 25, 2022
Maturiy	Jan. 24, 2025
Interest rate (%)	2.76%
Amounts issued for the subsequent period	₩ 50,000
51-2 Corporate bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Western Power Co., Ltd.
Issue date	Jan. 25, 2022
Maturiy	Jan. 24, 2042
Interest rate (%)	2.78%
Amounts issued for the subsequent period	₩ 20,000
52-1 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Western Power Co., Ltd.
Issue date	Mar. 28, 2022
Maturiy	Mar. 28, 2025
Interest rate (%)	3.18%
Amounts issued for the subsequent period	₩ 90,000
52-2 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Western Power Co., Ltd.
Issue date	Mar. 28, 2022
Maturiy	Mar. 28, 2042
Interest rate (%)	3.35%
Amounts issued for the subsequent period	₩ 30,000
52-3 Corporate Bond
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Western Power Co., Ltd.
Issue date	Mar. 28, 2022
Maturiy	Mar. 28, 2052
Interest rate (%)	3.20%
Amounts issued for the subsequent period	₩ 10,000
Corporate Bonds - 3
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Southern Power Co., Ltd.
Issue date	Mar. 24, 2022
Maturiy	Mar. 24, 2025
Interest rate (%)	3.13%
Amounts issued for the subsequent period	₩ 40,000
Corporate Bonds - 4
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Southern Power Co., Ltd.
Issue date	Mar. 24, 2022
Maturiy	Mar. 24, 2042
Interest rate (%)	3.29%
Amounts issued for the subsequent period	₩ 60,000
Corporate Bonds - 5
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Southern Power Co., Ltd.
Issue date	Apr. 26, 2022
Maturiy	Apr. 26, 2025
Interest rate (%)	3.63%
Amounts issued for the subsequent period	₩ 160,000
Corporate Bonds - 6
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Southern Power Co., Ltd.
Issue date	Apr. 26, 2022
Maturiy	Apr. 26, 2025
Interest rate (%)	3.63%
Amounts issued for the subsequent period	₩ 10,000
Corporate Bonds - 7
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea Southern Power Co., Ltd.
Issue date	Apr. 26, 2022
Maturiy	Apr. 26, 2052
Interest rate (%)	3.60%
Amounts issued for the subsequent period	₩ 20,000
Corporate Bonds - 8
Disclosure of non-adjusting events after reporting period [line items]
Company name	Korea East-West Power Co., Ltd.
Issue date	Apr. 22, 2022
Maturiy	Apr. 22, 2025
Interest rate (%)	3.75%
Amounts issued for the subsequent period	₩ 60,000

Construction Contracts - Additi

Construction Contracts - Additional Information (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Accumulated Earned Revenue Expense And Others [Line Items]
Revenue that was included in contract liability balance at beginning of period	₩ 661,212	₩ 643,477
Construction Contracts [Member]
Accumulated Earned Revenue Expense And Others [Line Items]
Revenue that was included in contract liability balance at beginning of period	87,934
Revenue from performance obligations satisfied or partially satisfied in previous periods	6,480
Receivables from contracts with customers	₩ 57,639	₩ 39,063