Korea Electric Power (KEP) 20-F 30 Apr 21 2020 FY Annual report (foreign) Financial data

Document And Entity Information

Document And Entity Information	12 Months Ended
	Dec. 31, 2020shares
Document Information [Line Items]
Entity Registrant Name	KOREA ELECTRIC POWER CORP
Entity Central Index Key	0000887225
Document Type	20-F
Document Period End Date	Dec. 31, 2020
Amendment Flag	false
Document Fiscal Year Focus	2020
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
ADS
Document Information [Line Items]
Trading Symbol	KEP
Security 12b Title	American depositary shares, each representing one-half of share of common stock
Security Exchange Name	NYSE
Common Stock
Document Information [Line Items]
Trading Symbol	KEP
Security 12b Title	Common stock, par value Won 5,000 per share
Security Exchange Name	NYSE

Consolidated Statements Of Fina

Consolidated Statements Of Financial Position - KRW (₩) ₩ in Millions		Dec. 31, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents (Notes 5,6,7 and 45)		₩ 2,029,584	₩ 1,810,129
Current financial assets, net (Notes 5,6,9,11,12,13,45 and 47)		2,800,220	1,586,509
Trade and other receivables, net (Notes 5,8,20,24,45,46 and 47)		7,918,470	7,701,452
Inventories, net (Note 14)		6,742,909	7,050,700
Income tax refund receivables (Note 41)		49,675	99,718
Current non-financial assets (Note 15)		1,020,158	1,206,377
Assets held for sale (Note 16 and 42)		925	28,116
Total current assets		20,561,941	19,483,001
Non-current assets
Non-current financial assets, net (Notes 5,6,9,10,11,12,13,45 and 47)		2,472,821	2,563,498
Non-current trade and other receivables, net (Notes 5,8,20,45,46 and 47)		1,861,569	2,002,297
Property, plant and equipment, net (Notes 18,24,27 and 49)		168,709,387	164,701,827
Investment properties, net (Notes 19 and 27)		225,195	158,580
Goodwill (Notes 16 and 51)		98,166	97,977
Intangible assets other than goodwill, net (Notes 21,27 and 46)		1,055,730	1,069,976
Investments in associates (Notes 4 and 17)		4,250,787	4,251,802
Investments in joint ventures (Notes 4 and 17)		1,919,746	1,663,029
Defined benefit assets, net (Note 25)		7,231	1,047
Deferred tax assets (Note 41)		1,733,146	1,437,829
Non-current non-financial assets (Note 15)		246,392	166,929
Total non-current assets		182,580,170	178,114,791
Total Assets (Note 4)		203,142,111	197,597,792
Current liabilities
Trade and other payables, net (Notes 5,22,24,45 and 47)		6,256,521	6,649,402
Current financial liabilities, net (Notes 5,12,23,45 and 47)		10,724,689	8,930,903
Income tax payables (Note 41)		476,898	358,277
Current non-financial liabilities (Notes 20,28 and 29)		5,971,450	5,688,353
Current provisions (Notes 26 and 45)		2,451,664	2,604,721
Total current liabilities		25,881,222	24,231,656
Non-current liabilities
Non-current trade and other payables, net (Notes 5,22,24,45 and 47)		6,480,412	6,965,760
Non-current financial liabilities, net (Notes 5,12,23,45 and 47)		59,365,011	59,115,598
Non-current non-financial liabilities (Notes 28 and 29)		9,661,941	8,834,452
Employee benefits liabilities, net (Notes 25 and 45)		1,910,860	1,929,854
Deferred tax liabilities (Note 41)		9,100,247	8,564,775
Non-current provisions (Notes 26 and 45)		20,075,572	19,066,048
Total non-current liabilities		106,594,043	104,476,487
Total liabilities (Note 4)		132,475,265	128,708,143
Equity
Contributed capital (Notes 1,30 and 45)		4,053,578	4,053,578
Share capital		3,209,820	3,209,820
Share premium		843,758	843,758
Retained earnings (Note 31)		51,133,601	49,202,133
Legal reserves	[1]	1,604,910	1,604,910
Voluntary reserves		32,179,066	34,785,425
Unappropriated retained earnings		17,349,625	12,811,798
Other components of equity (Note 34)		14,109,501	14,240,607
Other capital surplus		1,224,105	1,226,364
Accumulated other comprehensive loss		(409,577)	(280,730)
Other equity		13,294,973	13,294,973
Equity attributable to owners of the controlling company		69,296,680	67,496,318
Non-controlling interests (Notes 16 and 33)		1,370,166	1,393,331
Total equity		70,666,846	68,889,649
Total liabilities and equity		₩ 203,142,111	₩ 197,597,792
[1]	The KEPCO Act requires KEPCO to appropriate a legal reserve equal to at least 20 percent of net income for each accounting period until the reserve equals 50 percent of KEPCO's common stock. The legal reserve is not available for cash dividends; however, this reserve may be credited to paid-in capital or offset against accumulated deficit by the resolution of the shareholders.

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of comprehensive income [Abstract]
Sales (Notes 4,35,45 and 47)	₩ 57,925,837	₩ 58,568,082	₩ 60,033,062
Sales of goods	56,684,312	56,894,876	57,897,804
Sales of construction services (Note 20)	812,175	1,264,916	1,742,391
Sales of services	429,350	408,290	392,867
Cost of sales (Notes 14,25,43 and 47)	(51,804,596)	(57,779,835)	(58,207,721)
Cost of sales of goods	(50,353,315)	(55,750,468)	(55,976,628)
Cost of sales of construction services	(1,009,430)	(998,766)	(1,638,869)
Cost of sales of services	(441,851)	(1,030,601)	(592,224)
Gross profit	6,121,241	788,247	1,825,341
Selling and administrative expenses (Notes 25,36,43 and 47)	(2,678,443)	(2,669,576)	(2,627,890)
Other income (Note 28 and 37)	1,036,448	997,973	969,894
Other expenses (Note 37)	(417,720)	(241,913)	(231,330)
Other gains (losses), net (Note 38)	35,094	(582,258)	(621,124)
Operating profit (loss) (Note 4)	4,096,620	(1,707,527)	(685,109)
Finance income (Notes 5,12 and 39)	1,510,249	1,009,706	796,870
Finance expenses (Notes 5,12 and 40)	(2,896,443)	(2,782,156)	(2,470,743)
Profit (loss) related to associates, joint ventures and subsidiaries (Notes 4,16 and 17)	281,107	214,139	358,163
Share in profit of associates and joint ventures	398,972	257,673	473,269
Gain on disposal of investments in associates and joint ventures	10,165	70,094	5,079
Gain on disposal of investments in subsidiaries	0	0	73
Share in loss of associates and joint ventures	(119,848)	(90,853)	(110,168)
Loss on disposal of investments in associates and joint ventures	(16)	(2)	(2,183)
Impairment loss on investments in associates and joint ventures	(1,556)	(22,517)	(7,907)
Loss on disposal of investments in subsidiaries	(6,610)	(256)	0
Profit (loss) before income tax	2,991,533	(3,265,838)	(2,000,819)
Income tax benefit (expense) (Note 41)	(899,064)	1,002,303	826,321
Profit (loss) for the period	2,092,469	(2,263,535)	(1,174,498)
Other comprehensive income (loss), net of tax (Notes 5,12,25,31 and 34)	(219,841)	135,196	(106,925)
Items that will not be reclassified subsequently to profit or loss:
Remeasurements of defined benefit liability (Notes 25 and 31)	(69,804)	42,315	(108,169)
Share in other comprehensive income (loss) of associates and joint ventures (Note 31)	3,181	(6,789)	(1,153)
Net change in fair value of financial assets at fair value through other comprehensive income (Note 34)	(8,532)	(11,732)	(34,185)
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)	64,561	19,242	211
Foreign currency translation of foreign operations (Note 34)	(76,442)	72,816	(20,717)
Share in other comprehensive income (loss) of associates and joint ventures (Note 34)	(132,805)	19,344	57,088
Total comprehensive income (loss) for the period	1,872,628	(2,128,339)	(1,281,423)
Profit (loss) attributable to:
Owners of the controlling company (Note 44)	1,991,347	(2,345,517)	(1,314,567)
Non-controlling interests	101,122	81,982	140,069
Profit (loss) for the period	2,092,469	(2,263,535)	(1,174,498)
Total comprehensive income (loss) attributable to:
Owners of the controlling company	1,802,824	(2,239,147)	(1,426,477)
Non-controlling interests	69,804	110,808	145,054
Other comprehensive income (loss)	₩ 1,872,628	₩ (2,128,339)	₩ (1,281,423)
Earnings (loss) per share (in won) (Note 44)
Basic and diluted earnings (loss) per share	₩ 3,102	₩ (3,654)	₩ (2,048)

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
Balance at Dec. 31, 2017	₩ 72,964,641	₩ 71,681,445	₩ 4,053,578	₩ 53,370,558	₩ 14,257,309	₩ 1,283,196
Effect of change in accounting policy	(4,923)	(4,923)	0	71,928	(76,851)	0
Comprehensive income
Profit (loss) for the period	(1,174,498)	(1,314,567)	0	(1,314,567)	0	140,069
Items that will not be reclassified subsequently to profit or loss:
Remeasurements of defined benefit liability, net of tax	(108,169)	(100,495)	0	(100,495)	0	(7,674)
Share in other comprehensive income (loss) of associates and joint ventures, net of tax	(1,153)	(1,153)	0	(1,153)	0	0
Net change in fair value of financial assets at fair value through other comprehensive income	(34,185)	(34,125)	0	0	(34,125)	(60)
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	211	(1,140)	0	0	(1,140)	1,351
Foreign currency translation of foreign operations, net of tax	(20,717)	(32,086)	0	0	(32,086)	11,369
Share in other comprehensive income (loss) of associates and joint ventures, net of tax	57,088	57,089	0	0	57,089	(1)
Dividends paid	599,893	507,152	0	507,152	0	92,741
Issuance of shares capital by subsidiaries	18,215	1,032	0	0	1,032	17,183
Transactions between consolidated entities	0	0	0	0	0	0
Changes in consolidation scope	9,530	0	0	0	0	9,530
Dividends paid (hybrid bond)	13,385	0	0	0	0	13,385
Balance at Dec. 31, 2018	71,092,762	69,743,925	4,053,578	51,519,119	14,171,228	1,348,837
Effect of change in accounting policy	0	0	0	0	0	0
Comprehensive income
Profit (loss) for the period	(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
Balance at Dec. 31, 2019	68,889,649	67,496,318	4,053,578	49,202,133	14,240,607	1,393,331
Effect of change in accounting policy	0	0	0	0	0	0
Comprehensive income
Profit (loss) for the period	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
Other changes in equity	0	0
Balance at Dec. 31, 2020	₩ 70,666,846	₩ 69,296,680	₩ 4,053,578	₩ 51,133,601	₩ 14,109,501	₩ 1,370,166

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows provided by operating activities
Profit (loss) for the period	₩ 2,092,469	₩ (2,263,535)	₩ (1,174,498)
Adjustments for:
Income Tax expense (benefit)	899,064	(1,002,303)	(826,321)
Depreciation	11,377,553	10,971,825	9,905,856
Amortization	170,466	156,915	118,938
Employee benefit expense	492,288	725,120	360,575
Bad debt expense	50,686	16,629	57,468
Interest expense	1,995,425	2,046,811	1,868,458
Loss on sale of financial assets	648	2,106	1
Loss on disposals of property, plant and equipment	162,725	72,508	60,704
Loss on abandonment of property, plant, and equipment	255,346	364,233	481,176
Impairment loss on property, plant and equipment	80,413	50,034	710,162
Impairment loss on intangible assets	3,599	513,609	8,112
Loss on disposal of intangible assets	392	827	43
Increase to provisions	1,832,765	2,301,215	1,056,994
Loss (gain) on foreign currency translation, net	(782,167)	370,309	243,378
Gain on valuation of financial assets at fair value through profit or loss	(12,904)	(5,575)	(8,495)
Loss on valuation of financial assets at fair value through profit or loss	7,396	4,513	6,616
Valuation and transaction loss (gain) on derivative instruments, net	390,322	(403,765)	(300,500)
Share in loss (profit) of associates and joint ventures, net	(279,124)	(166,820)	(363,101)
Gain on disposal of financial assets	(11,992)	(3,866)	(1,838)
Gain on disposal of property plant, and equipment	(93,195)	(43,784)	(98,077)
Gain on disposal of intangible assets	(1,556)	(206)	(12)
Gain on disposal of investments in associates and joint ventures	(10,165)	(70,094)	(5,079)
Loss on disposal of investments in associates and joint ventures	16	2	2,183
Impairment loss on investments in associates and joint ventures	1,556	22,517	7,907
Gain on disposal of investments in subsidiaries	0	0	(72)
Loss on disposal of investments in subsidiaries	6,610	256	0
Interest income	(242,586)	(268,118)	(223,767)
Dividend income	(7,316)	(13,838)	(12,777)
Other inflows (outflows) of cash	30,411	128,237	81,317
Adjustments for Cash flows from operating activities	16,316,676	15,769,297	13,129,849
Changes in:
Trade receivables	(107,639)	95,345	246,755
Non-trade receivables	459,524	64,027	154,580
Accrued income	(258,963)	83,589	(484,718)
Other receivables	(32,536)	(116,583)	(61,961)
Other current assets	(462,125)	(271,986)	(148,509)
Inventories	(723,495)	(980,216)	(1,771,550)
Other non-current assets	(140,017)	(611,066)	(54,148)
Trade payables	(262,985)	(546,159)	478,744
Non-trade payables	(363,260)	192,506	(292,912)
Accrued expenses	(222,113)	(454,501)	(361,204)
Other current liabilities	388,163	373,403	250,112
Other non-current liabilities	755,005	650,468	287,488
Investments in associates and joint ventures (dividends received)	237,695	215,612	175,175
Provisions	(1,499,436)	(1,473,461)	(1,132,969)
Payments of employee benefit obligations	(74,848)	(65,242)	(89,253)
Plan assets	(582,275)	(348,386)	(330,064)
Changes in assets and liabilities Cash flows from operating activities	(2,889,305)	(3,192,650)	(3,134,434)
Cash generated from operating activities	15,519,840	10,313,112	8,820,917
Dividends received (financial assets at fair value through other comprehensive income)	7,316	24,255	11,182
Interest paid	(2,081,663)	(2,027,850)	(1,895,898)
Interest received	215,183	186,122	194,221
Income taxes paid	(452,203)	(282,211)	(450,290)
Net cash flows from operating activities	13,208,473	8,213,428	6,680,132
Cash flows provided by investing activities
Proceeds from disposals of investments in associates and joint ventures	5,444	0	1,617
Acquisition of investments in associates and joint ventures	(342,116)	(107,821)	(319,425)
Proceeds from sales of property, plant and equipment	331,777	522,742	234,138
Acquisition of property, plant and equipment	(13,281,294)	(14,000,359)	(12,266,870)
Proceeds from sales of intangible assets	10,871	7,702	13
Acquisition of intangible assets	(120,371)	(229,426)	(110,587)
Proceeds from disposals of financial assets	8,020,406	2,783,474	2,419,259
Acquisition of financial assets	(9,203,450)	(2,165,342)	(2,841,651)
Increase in loans	(336,744)	(335,773)	(188,675)
Collection of loans	215,292	292,745	100,010
Increase in deposits	(276,255)	(280,637)	(299,564)
Decrease in deposits	280,941	275,314	259,930
Proceeds from disposals of assets held-for-sale	32,578	30,662	18,716
Receipt of government grants	41,209	21,705	30,416
Cash outflow from merger	0	(154,311)	0
Net cash inflow (outflow) from changes in consolidation scope	(24,624)	(2,917)	2,141
Other cash inflow (outflow) from investing activities, net	(185,475)	(157,116)	(53,769)
Net cash flows used in investing activities	(14,831,811)	(13,499,358)	(13,014,301)
Cash flows provided by financing activities
Proceeds from (Repayment of) short-term borrowings, Net	345,338	188,957	(183,660)
Proceeds from long-term borrowings and debt securities	10,170,107	13,221,407	14,251,586
Repayment of long-term borrowings and debt securities	(7,976,658)	(7,068,290)	(8,095,590)
Payment of lease liabilities	(613,977)	(573,437)	(134,454)
Settlement of derivative instruments, net	42,263	102,146	60,907
Change in non-controlling interests	11,554	17,365	20,113
Dividends paid (hybrid bond)	(13,385)	(13,385)	(17,658)
Dividends paid	(81,298)	(99,356)	(599,391)
Other cash outflow from financing activities, net	(3,120)	0	(175)
Net cash from financing activities	1,880,824	5,775,407	5,301,678
Net increase (decrease) in cash and cash equivalents before effect of exchange rate fluctuations	257,486	489,477	(1,032,491)
Effect of exchange rate fluctuations on cash held	(38,031)	(37,693)	21,097
Net increase (decrease) in cash and cash equivalents	219,455	451,784	(1,011,394)
Cash and cash equivalents at January 1	1,810,129	1,358,345	2,369,739
Cash and cash equivalents at December 31	₩ 2,029,584	₩ 1,810,129	₩ 1,358,345

Reporting Entity (Description o

Reporting Entity (Description of the controlling company)	12 Months Ended
	Dec. 31, 2020
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 Act (the “KEPCO Act”) to engage in the generation, transmission and distribution of electricity and development of electric power resources in the Republic of Korea. KEPCO also provides power plant construction services. 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. KEPCO’s headquarter is located in Naju, Jeollanam-do. As of December 31, 2020, KEPCO’s share capital amounts to W Number of Percentage of ownership The Government of the Republic of Korea 116,841,794 18.20 % Korea Development Bank 211,235,264 32.90 % Foreign investors 106,414,565 16.58 % Other 207,472,454 32.32 % 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, 2020
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 on February 19, 2021 and authorized on April 16, 2021 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 (“won”), 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, 2019 and 2020 are W W (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. 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. (vii) Early shutdown of 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, 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 Wolsong unit 1 on the grounds that its deficit was increasing and its economic efficiency was low due to the nonoptimal utilization rate. On December 24, 2019, NSSC approved permanent shutdown of unit 1. In addition, the Company has also decided to discontinue the construction of Cheonji unit 1 and 2 and Daejin unit 1 and 2 pursuant to the government policy. Accordingly, the Company recognized impairment loss and other expenses during the year ended December 31, 2018. Among the new nuclear power plants under construction, Shin-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 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. Korean government plans to refund to the Company for reasonable expenditures incurred in relation to the phase-out As of December 31, 2020, there is no indication that the above-mentioned impairment no longer exists or has been 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, 2020 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, 2020, even though the early adoption of these standards is possible. Amendments to IFRS 3 ‘Business Combination’—Definition of a Business The amendment to IFRS 3 clarifies that to be considered a business, an integrated set of activities and assets must include, at a minimum, an input and a substantive process that together significantly contribute to the ability to create output. Furthermore, it clarified that a business can exist without including all of the inputs and processes needed to create outputs. Amendments to IFRS 7 ‘Financial Instruments : Disclosures’, IFRS 9 ‘Financial Instruments’, and IAS 39 ‘Financial Instruments : Recognition and Measurements’—Interest Rate Benchmark Reform The amendments to IFRS 9 and IAS 39 provide a number of reliefs, which apply to all hedging relationships that are directly affected by interest rate benchmark reform. A hedging relationship is affected if the reform gives rise to uncertainties about the timing or amount of benchmark-based cash flows of the hedged item or the hedging instrument. Amendments to IAS 1 ‘Presentation of Financial Statements’ and IAS 8 ‘Accounting Policies, Changes in Accounting Estimates and Errors’—Definition of Material The amendments provide a new definition of material that states “information is material if omitting, misstating or obscuring it could reasonably be expected to influence decisions that the primary users of general purpose financial statements make on the basis of those financial statements, which provide financial information about a specific reporting entity.” The amendments clarify that materiality will depend on the nature or magnitude of information, either individually or in combination with other information, in the context of the financial statements. A misstatement of information is material if it could reasonably be expected to influence decisions made by the primary users. The Conceptual Framework for Financial Reporting The Conceptual Framework is not a standard, and none of the concepts contained therein override the concepts or requirements in any standard. The purpose of the Conceptual Framework is to assist the IASB (International Accounting Standards Board) in developing standards, to help preparers develop consistent accounting policies where there is no applicable standard in place and to assist all parties to understand and interpret the standards. The revised Conceptual Framework includes some new concepts, provides updated definitions and recognition criteria for assets and liabilities and clarifies some important concepts. Amendments to IFRS 16 Covid-19 The amendments provide relief to lessees from applying IFRS 16 guidance on lease modification accounting for rent concessions arising as a direct consequence of the Covid-19 Covid-19 Covid-19

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2020
Significant Accounting Policies [Abstract]
Significant Accounting Policies	3. Significant Accounting Policies The significant accounting policies applied by the Company in preparation of its consolidated financial statements are consistent with those followed in the preparation of the Company’s consolidated financial statements as of and for the year ended December 31, 2019, 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 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. The Company adopted the cost pass-through tariff system from January 1, 2021 with the approval of the Ministry of Trade, Industry and Energy (MOTIE) on December 17, 2020, and the new system is only effective prospectively with no retrospective adjustments expected. The Company is currently analyzing the accounting policies regarding the adoption of the new system. (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. (8) Deferred Revenue The Company receives consideration in the form of an item of property, equipment or cash for constructing or acquiring an item of property or equipment in exchange for supplying electricity to its customers. The transaction price is based on the fair value of the consideration received and is initially recorded in deferred revenue included in current and non-current non-financial (9) Leases The lessee and the lessor account for each lease component separately from non-lease non-lease non-lease (i) The Company as a lessor In the case of finance leases, the Company recognizes the same amount of the net investment in the lease as finance lease receivables and recognizes interest income using the effective interest rate method. Income from operating leases is recognized using the straight-line basis over the lease term, and lease opening direct costs incurred during the negotiation and contract phase of the operating lease contract are added to the carrying amount of the lease asset and recognized as expenses over the lease term on a straight-line basis. (ii) The Company as a lessee (a) Right-of-use The Company recognizes right-of-use Right-of-use re-measurement right-of-use right-of-use Right-of-use (b) Lease liabilities At the commencement date of the lease, the Company recognizes lease liabilities measured at the present value of lease payments to be made over the lease term. The lease payments include fixed payments (including in-substance In calculating the present value of lease payments, the Company uses its incremental borrowing rate at the lease commencement date if the interest rate implicit in the lease is not readily determinable. After the commencement date, the amount of lease liabilities is increased to reflect the accretion of interest and reduced for the lease payments made. In addition, the carrying amount of lease liabilities is remeasured if there is a modification, a change in the lease term, a change in the in-substance (c) Short-term leases and leases of low-value The Company applies the short-term leases recognition exemption to its short-term leases of machinery and equipment (i.e., those leases that have a lease term of 12 months or less from the commencement date and do not contain a purchase option). It also applies the leases of low-value low-value Book value and changes in book value of right-of-use (10) Foreign currencies Transactions in foreign currencies are translated to the respective functional currencies of the Company entities at exchange rates at the dates of the transactions. Monetary items in foreign currencies are retranslated to the functional currency using the reporting date’s exchange rate. Non-monetary Exchange differences are recognized in profit or loss in the period in which they arise except for: • Exchange differences on foreign currency borrowings relating to assets under construction for future productive use, which are included in the cost of those assets when they are regarded as an adjustment to interest costs on those foreign currency borrowings; • Exchange differences on transactions entered into in order to hedge certain foreign currency risks (refer to note 3.(24) Derivative financial instruments, including hedge accounting); and • Exchange differences on monetary items receivable from or payable to a foreign operation for which settlement is neither planned nor likely to occur (therefore forming part of the net investment in the foreign operation), which are recognized initially in other comprehensive income and reclassified from equity to profit or loss on disposal or partial disposal of the net investment. For the purpose of presenting financial statements, the assets and liabilities of the Company’s foreign operations are expressed in Korean won using exchange rates prevailing at the end of the reporting period. Income and expense items are translated at the average exchange rates for the period, unless exchange rates fluctuated significantly during that period, in which case the exchange rates at the dates of the transactions are used. Exchange differences arising, if any, are recognized in other comprehensive income and accumulated in equity (if applicable, in non-controlling On the disposal of a foreign operation, the cumulative amount of the exchange differences relating to that foreign operation that have been attributed to the controlling interests shall be reclassified from equity to profit or loss (as a reclassification adjustment). The cumulative amount of the exchange differences relating to that foreign operation that have been attributed to the non-controlling On the partial disposal of a subsidiary that includes a foreign operation, the entity shall re-attribute non-controlling Any goodwill arising on the acquisition of a foreign operation and any fair value adjustments to the carrying amounts of assets and liabilities arising on the acquisition of that foreign operation shall be treated as assets and liabilities of the foreign operation. Thus they shall be expressed in the functional currency of the foreign operation and shall be translated at the closing rate. Such exchange differences shall be recognized in equity. (11) Borrowing costs The Company capitalizes borrowing costs directly attributable to the acquisition, construction or production of a qualifying asset as part of the cost of that asset. Other borrowing costs are recognized in expense as incurred. A qualifying asset is an asset that requires a substantial period of time to get ready for its intended use or sale. Investment income earned on the temporary investment of specific borrowings pending their expenditure on qualifying assets is deducted from the borrowing costs eligible for capitalization. All other borrowing costs are recognized in profit or loss in the period in which they are incurred. (12) Government grants Government grants are not recognized unless there is reasonable assurance that the Company will comply with the grant’s conditions and that the grant will be received. Benefit from a government loan at a below-market interest rate is treated as a government grant, measured as the difference between proceeds received and the fair value of the loan based on prevailing market interest rates. (i) If the Company received grants related to assets Government grants whose primary condition is that the Company purchases, constructs or otherwise acquires long-term assets are deducted in calculating the carrying amount of the asset. The grant is recognized in profit or loss over the life of a depreciable asset as a reduced depreciation expense. (ii) If the Company received grants related to expenses Government grants which are intended to compensate the Company for expenses incurred are recognized as other income (government grants) in profit or loss over the periods in which the Company recognizes the related costs as expenses. (13) Employee benefits When an employee has rendered service to the Company during a period, the Company recognizes the contribution payable to a defined contribution plan in exchange for that service as a liability (accrued expense). For defined benefit pension plans and other post-employment benefits, the net periodic pension expense is actuarially determined by “Pension Actuarial System” developed by independent actuaries using the projected unit credit method. The present value of the defined benefit obligation is determined by discounting the estimated future cash outflows using interest rates of high-quality corporate bonds that are denominated in the currency in which the benefits will be paid and that have terms to maturity approximating the terms of the related pension liability. However, if there is not a deep market, market yields on government bonds are used. Net defined benefit liability’s measurement is composed of actuarial gains and losses, return on plan assets excluding net interest on net defined benefit liability, and any change in the effect of the asset ceiling, excluding net interest, which are immediately recognized in other comprehensive income. The actuarial gains or losses recognized in other comprehensive income which will not be reclassified into net profit or loss for later periods are immediately recognized in retained earnings. Past service cost will be recognized as expenses upon the earlier of the date of change or reduction to the plan, or the date of recognizing termination benefits. The retirement benefit obligation recognized in the consolidated statement of financial position represents the present value of the defined benefit obligation as adjusted for unrecognized actuarial gains and losses and unrecognized past service cost, and as reduced by the fair value of plan assets. Any asset resulting from this calculation is limited to unrecognized actuarial losses and past service cost, plus the present value of available refunds and reductions in future contributions to the plan. (14) Income taxes Income tax expense comprises current and deferred tax. Current tax and deferred tax are recognized in profit or loss except to the extent that it relates to a business combination, or items recognized directly in equity or in other comprehensive income. (i) Current tax Current tax is the expected tax payable or receivable on the taxable profit or loss for the year, using tax rates enacted or substantively enacted at the end of the reporting period and any adjustment to tax payable in respect of previous years. The taxable profit is different from the accounting profit for the period since the taxable profit is calculated excluding the temporary differences, which will be taxable or deductible in determining taxable profit (tax loss) of future periods, and non-taxable non-deductible Current tax assets and liabilities are offset only if, the Company: (a) has a legally enforceable right to set off the recognized amounts; and (b) intends either to settle on a net basis, or to realize the asset and settle the liability simultaneously. (ii) Deferred tax Deferred tax is recognized, using the asset-liability method, in respect of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for taxation purposes. A deferred tax liability is recognized for all taxable temporary differences. A deferred tax asset is recognized for all deductible temporary differences to the extent that it is probable that taxable profit will be available against which they can be utilized. However, deferred tax is not recognized for the following temporary differences: taxable temporary differences arising on the initial recognition of goodwill, or the initial recognition of assets or liabilities in a transaction that is not a business combination and that affects neither accounting profit or loss nor taxable income. In certain circumstances such as when accounting for leases or decommissioning costs of nuclear power plants, the carrying amount of the asset recorded is equal to the liability recognized at initial recognition. When recording its deferred tax balances, the Company considers these assets and liabilities separately on a gross basis. Accordingly, the taxable temporary difference relating to the asset and the deductible temporary difference relating to the liability are separately recognized and presented on a net basis in the consolidated financial statements. The measurement of deferred tax liabilities and deferred tax assets reflects the tax consequences that would follow from the manner in which the Company expects, at the end of the reporting period, to recover or settle the carrying amount of its assets and liabilities. Deferred tax assets or deferred tax liabilities on investment properties measured at fair value, unless any contrary evidence exists, are measured using the assumption that the carrying amount of the property will be recovered entirely through sale. The Company recognizes a deferred tax liability for all taxable temporary differences associated with investments in subsidiaries, associates, and interests in joint ventures, except to the extent that the Company is able to control the timing of the reversal of the temporary difference and it is probable that the temporary difference will not reverse in the foreseeable future. The Company recognizes a deferred tax asset for all deductible temporary differences arising from investments in subsidiaries and associates, to the extent that it is probable that the temporary difference will reverse in the foreseeable future and taxable profit will be available against which the temporary difference can be utilized. The carrying amount of a deferred tax asset is reviewed at the end of each reporting period and reduces the carrying amount to the extent that it is no longer probable that sufficient taxable profit will be available to allow the benefit of part or all of that deferred tax asset to be utilized. Deferred tax assets and liabilities are measured at the tax rates that are expected to apply to the period when the asset is realized or the liability is settled, based on tax rates (and tax laws) that have been enacted or substantively enacted by the end of the reporting period. The measurement of deferred tax liabilities and deferred tax assets reflects the tax consequences that would follow from the manner in which the Company expects, at the end of the reporting period to recover or settle the carrying amount of its assets and liabilities. Deferred tax assets and liabilities are offset only if there is a legally enforceable right to offset the related current tax liabilities and assets, and they relate to income taxes levied by the same tax authority and they intend to settle current tax liabilities and assets on a net basis. (iii) Current and deferred tax for the year Current and deferred tax are recognized in profit or loss, except when they relate to items that are recognized in other comprehensive income or directly in equity, in which case, the current and deferred tax are also recognized in other comprehensive income or directly in equity respectively. Where current tax or deferred tax arises from the initial accounting for a business combination, the tax effect is included in the accounting for the business combination. (15) Property, plant and equipment Property, plant and equipment are initially measured at cost and after initial recognition, are carried at cost less accumulated depreciation and accumulated impairment losses. The cost of property, plant and equipment includes expenditures arising directly from the construction or acquisition of the asset, any costs directly attributable to bringing the asset to the location and condition necessary for it to be capable of operating in the manner intended by management and the initial estimate of the costs of dismantling and removing the item and restoring the site on which it is located. Subsequent costs are recognized in the carrying amount of property, plant and equipment at cost or, if appropriate, as separate items if it is probable that future economic benefits associated with the item will flow to the Company and the cost of the item can be measured reliably. The carrying amount of the replaced part is derecognized. The costs of the day-to-day Property, plant and equipment, except for land, are depreciated on a straight-line basis over estimated useful lives that appropriately reflect the pattern in which the asset’s future economic benefits are expected to be consumed. For loaded nuclear fuel related to long-term raw materials and spent nuclear fuels related to asset retirement costs, the Company uses the unit-of-production The estimated useful lives of the Company’s property, plant and equipment are as follows: Useful lives (years) Buildings 8 ~ 40 Structures 5 ~ 50 Machinery 2 ~ 32 Vehicles 3 ~ 8 Loaded heavy water 30 Asset retirement costs 18, 30, 40, 60 Right-of-use 1 ~ 65 Ships 9 Others 4 ~ 15 A component that is

Segment, Geographic and Other I

Segment, Geographic and Other Information	12 Months Ended
	Dec. 31, 2020
Segment, Geographic and Other Information [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, 2018, 2019 and 2020, respectively, are as follows: 2018 Segment Total Intersegment Revenue Depreciation Interest Interest Profit Employee Loss on Increase in Operating In millions of won Transmission and distribution W 59,676,952 1,393,120 58,283,832 3,555,158 77,925 708,329 287,268 144,180 424,774 580,931 (1,814,363 ) Electric power generation (Nuclear) 8,858,717 8,833,787 24,930 3,088,019 30,422 503,161 9,946 76,467 38,886 520,167 357,401 Electric power generation (Non-nuclear) 25,204,085 24,389,816 814,269 3,269,023 29,313 577,441 58,993 91,140 17,516 (227,234 ) 482,418 Plant maintenance & engineering service 2,526,126 2,170,959 355,167 114,030 12,505 4,126 1,956 77,526 — 174,785 314,755 Others 996,300 441,436 554,864 55,513 117,878 119,037 — 1,742 — 356 102,421 Consolidation adjustments (37,229,118 ) (37,229,118 ) — (56,949 ) (44,276 ) (43,636 ) — (30,480 ) — 7,989 (127,741 ) W 60,033,062 — 60,033,062 10,024,794 223,767 1,868,458 358,163 360,575 481,176 1,056,994 (685,109 ) Finance income 796,870 Finance expense (2,470,743 ) Gain related to associates, joint ventures and subsidiaries 358,163 Loss before income tax W (2,000,819 ) 2019 Segment Total Intersegment Revenue Depreciation Interest Interest Profit (loss) Employee Loss on Increase in Operating In millions of won Transmission and distribution W 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 ) W 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 W (3,265,838 ) 2020 Segment Total 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 Profit before income tax ￦ 2,991,533 (3) Information related to segment assets and segment liabilities as of and for the years ended December 31, 2019 and 2020 are as follows: 2019 Segment Segment assets Investments Acquisition of non-current Segment In millions of won Transmission and distribution ￦ 109,809,254 3,716,931 6,340,593 58,350,681 Electric power generation (Nuclear) 59,562,190 59,081 2,574,358 33,909,152 Electric power generation (Non-nuclear) 54,758,933 2,088,581 4,955,784 33,117,193 Plant maintenance & engineering service 3,528,879 50,238 95,810 1,124,855 Others 7,833,516 — 344,795 3,531,496 Segment totals 235,492,772 5,914,831 14,311,340 130,033,377 Consolidation adjustments: Elimination of inter-segment amounts (39,207,636 ) — (81,555 ) (6,654,717 ) Equity method adjustment 1,791,844 — — — Deferred taxes 2,048 — — 5,329,158 Others (481,236 ) — — 325 (37,894,980 ) — (81,555 ) (1,325,234 ) Consolidated totals ￦ 197,597,792 5,914,831 14,229,785 128,708,143 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 (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 Geographical unit Revenue from external customers Non-current 2018 2019 2020 2018 2019 2020 In millions of won Domestic ￦ 57,799,991 56,942,128 56,774,577 157,037,428 169,366,365 173,673,478 Overseas(*1) 2,233,071 1,625,954 1,151,260 3,299,346 2,743,755 2,831,925 ￦ 60,033,062 58,568,082 57,925,837 160,336,774 172,110,120 176,505,403 (*1) Middle East and other Asian countries make up the majority of overseas revenue and non-current non-current (*2) The amounts exclude financial assets and deferred tax assets. (5) Information on significant customers There is no single customer which accounts for 10% or more of the Company’s revenue for the years ended December 31, 2018, 2019 and 2020.

Classification of Financial Ins

Classification of Financial Instruments	12 Months Ended
	Dec. 31, 2020
Classification of Financial Instruments [Abstract]
Classification of Financial Instruments	5. Classification of Financial Instruments (1) Classification of financial assets as of December 31, 2019 and 2020 are as follows: 2019 Financial assets Financial assets Financial assets Derivative assets Total In millions of won Current assets Cash and cash equivalents ￦ — — 1,810,129 — 1,810,129 Current financial assets Current financial assets at fair value through profit or loss 131,385 — — — 131,385 Current financial assets at amortized costs — — 12,302 — 12,302 Current derivative assets 21 — — 27,597 27,618 Other financial assets — — 1,415,204 — 1,415,204 Trade and other receivables — — 7,701,452 — 7,701,452 131,406 — 10,939,087 27,597 11,098,090 Non-current Non-current Non-current 615,876 — — — 615,876 Non-current — 379,170 — — 379,170 Non-current — — 1,307 — 1,307 Non-current 165,183 — — 118,232 283,415 Other financial assets — — 1,283,730 — 1,283,730 Trade and other receivables — — 2,002,297 — 2,002,297 781,059 379,170 3,287,334 118,232 4,565,795 ￦ 912,465 379,170 14,226,421 145,829 15,663,885 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 Non-current Non-current 685,281 — — — 685,281 Non-current — 358,559 — — 358,559 Non-current — — 1,273 — 1,273 Non-current 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 (2) Classification of financial liabilities as of December 31, 2019 and 2020 are as follows: 2019 Financial liabilities at fair value through profit or loss Financial liabilities Derivative liabilities Total In millions of won Current liabilities Borrowings ￦ — 1,315,134 — 1,315,134 Debt securities — 7,542,705 — 7,542,705 Derivative liabilities 13,286 — 59,778 73,064 Trade and other payables — 6,649,402 — 6,649,402 13,286 15,507,241 59,778 15,580,305 Non-current Borrowings — 3,389,743 — 3,389,743 Debt securities — 55,628,959 — 55,628,959 Derivative liabilities 39,861 — 57,035 96,896 Trade and other payables — 6,965,760 — 6,965,760 39,861 65,984,462 57,035 66,081,358 ￦ 53,147 81,491,703 116,813 81,661,663 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 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 (3) Classification of comprehensive income (loss) from financial instruments for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Cash and cash equivalents Interest income ￦ 40,704 42,861 9,419 Financial assets at fair value through profit or loss Interest income 21,713 29,411 19,114 Gain on valuation of derivatives 34,117 151,604 (52,447 ) Gain on transaction of derivatives 39,114 63,329 36,563 Gain on valuation of financial assets 1,879 1,062 5,508 Gain on disposal of financial assets 1,837 1,760 11,344 Financial assets at fair value through other comprehensive income Dividends income 12,777 13,838 7,316 Financial assets at amortized cost Interest income 89 539 612 Loans Interest income 21,925 63,448 26,232 Trade and other receivables Interest income 90,390 69,941 151,035 Short-term financial instruments Interest income 41,025 49,070 25,540 Long-term financial instruments Interest income 7,920 12,794 10,406 Other financial assets Interest income 1 54 228 Derivative assets (applying hedge accounting) Gain (loss) on valuation of derivatives (profit or loss) 69,799 123,730 (77,733 ) Gain on valuation of derivatives (equity, before tax) 8,600 38,305 9,925 Gain on transaction of derivatives 34,152 65,651 36,053 Financial liabilities at fair value through profit or loss Gain (loss) on valuation of derivatives (4,650 ) 27,686 (104,607 ) Gain on transaction of derivatives 36,046 (493 ) (49,788 ) Financial liabilities carried at amortized cost Interest expense of borrowings and debt securities 1,320,516 1,394,328 1,365,801 Gain (loss) on repayment of financial liabilities — — (35 ) Interest expense of trade and other payables 42,830 94,019 88,757 Interest expense of others 505,112 558,464 540,867 Gain (loss) on foreign currency transactions and translations (356,159 ) (406,175 ) 739,244 Derivative liabilities (applying hedge accounting) Gain (loss) on valuation of derivatives (profit or loss) 53,937 14,330 (220,928 ) Gain (loss) on valuation of derivatives (equity, before tax) (15,029 ) (2,578 ) 101,295 Gain (loss) on transaction of derivatives 37,985 (42,072 ) 42,565

Restricted Deposits

Restricted Deposits	12 Months Ended
	Dec. 31, 2020
Restricted Deposits [Abstract]
Restricted Deposits	6. Restricted Deposits Restricted deposits as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Cash and cash equivalents Escrow accounts ￦ — 544 Deposits for government project and others 9,287 5,066 Collateral provided for borrowings 63,198 117,747 Collateral provided for lawsuit 3 42 Deposits for transmission regional support program 3,002 5,469 Short-term financial instruments Restriction on withdrawal related to ‘win-win 93,000 109,000 Non-current Decommissioning costs of nuclear power plants 541,969 577,481 Long-term financial instruments Escrow accounts 74 76 Guarantee deposits for banking accounts at oversea branches 326 306 Collateral provided for borrowings 11,745 11,745 Decommissioning costs of nuclear power plants 250,464 258,282 Funds for developing small and medium enterprises(*) 200,000 210,000 ￦ 1,173,068 1,295,758 (*) Deposits for small and medium enterprise at the Industrial Bank of Korea (IBK) and others for construction of Bitgaram Energy Valley and support for high potential businesses as of December 31, 2019 and 2020.

Cash and Cash Equivalents

Cash and Cash Equivalents	12 Months Ended
	Dec. 31, 2020
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	7. Cash and Cash Equivalents Cash and cash equivalents as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Cash ￦ 266 871 Other demand deposits 1,117,499 1,291,058 Short-term deposits classified as cash equivalents 527,235 432,263 Short-term investments classified as cash equivalents 165,129 305,392 ￦ 1,810,129 2,029,584

Trade and Other Receivables

Trade and Other Receivables	12 Months Ended
	Dec. 31, 2020
Trade and Other Receivables [Abstract]
Trade and Other Receivables	8. Trade and Other Receivables (1) Trade and other receivables as of December 31, 2019 and 2020 are as follows: 2019 Gross Allowance for doubtful accounts Present value discount Book In millions of won Current assets Trade receivables ￦ 7,147,683 (208,505 ) — 6,939,178 Other receivables 792,147 (27,579 ) (2,294 ) 762,274 7,939,830 (236,084 ) (2,294 ) 7,701,452 Non-current Trade receivables 338,261 (4,254 ) (382 ) 333,625 Other receivables 1,759,930 (86,576 ) (4,682 ) 1,668,672 2,098,191 (90,830 ) (5,064 ) 2,002,297 ￦ 10,038,021 (326,914 ) (7,358 ) 9,703,749 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 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 (2) Other receivables as of December 31, 2019 and 2020 are as follows: 2019 Gross Allowance for doubtful accounts Present value Book In millions of won Current assets Non-trade ￦ 376,438 (27,201 ) — 349,237 Accrued income 68,921 — — 68,921 Deposits 273,887 — (2,294 ) 271,593 Finance lease receivables(*1) 60,304 (378 ) — 59,926 Others 12,597 — — 12,597 792,147 (27,579 ) (2,294 ) 762,274 Non-current Non-trade 196,821 (78,654 ) — 118,167 Accrued income 2,222 — — 2,222 Deposits 338,989 — (4,682 ) 334,307 Finance lease receivables(*2) 1,118,537 (484 ) — 1,118,053 Others 103,361 (7,438 ) — 95,923 1,759,930 (86,576 ) (4,682 ) 1,668,672 ￦ 2,552,077 (114,155 ) (6,976 ) 2,430,946 (*1) Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of ￦ 112,789 million. (*2) Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of ￦ 1,218,934 million. 2020 Gross Allowance for doubtful accounts Present value Book In millions of won Current assets Non-trade ￦ 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 Non-trade 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. (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, 2019 and 2020 are as follows: 2019 2020 In millions of won Trade receivables: (not overdue) ￦ 7,338,757 7,274,773 Trade receivables: (impairment reviewed) 147,187 323,411 Less than 60 days 6,555 3,505 60 ~ 90 days 1,899 28,729 90 ~ 120 days 2,106 10,687 120 days ~ 1 year 37,357 34,036 Over 1 year 99,270 246,454 7,485,944 7,598,184 Less: allowance for doubtful accounts (212,759 ) (208,990 ) Less: present value discount (382 ) — ￦ 7,272,803 7,389,194 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, 2019 and 2020 are as follows: 2019 2020 In millions of won Other receivables: (not overdue) ￦ 2,327,640 2,363,967 Other receivables: (impairment reviewed) 224,437 164,117 Less than 60 days 98,220 46,399 60 ~ 90 days 2,034 31,183 90 ~ 120 days 14,135 1,873 120 days ~ 1 year 26,212 11,803 Over 1 year 83,836 72,859 2,552,077 2,528,084 Less: allowance for doubtful accounts (114,155 ) (132,379 ) Less: present value discount (6,976 ) (4,860 ) ￦ 2,430,946 2,390,845 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 trade 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, 2018, 2019 and 2020 are as follows: 2018 2019 2020 Trade Other Trade Other Trade Other In millions of won Beginning balance ￦ 173,583 78,008 215,868 104,726 212,759 114,155 Effect of change in accounting policy 6,641 128 — — — — Loss allowance as at January 1 under IFRS 9 180,224 78,136 215,868 104,726 212,759 114,155 Bad debt expense 41,498 17,817 29,221 19,206 24,021 27,329 Write-off (7,696 ) (244 ) (10,106 ) (1,146 ) (20,332 ) (1,910 ) Reversal (1,726 ) (143 ) (41,940 ) — (3,373 ) (2,464 ) Others 3,568 9,160 19,716 (8,631 ) (4,085 ) (4,731 ) Ending balance ￦ 215,868 104,726 212,759 114,155 208,990 132,379

Financial Assets at Fair Value

Financial Assets at Fair Value through Profit or Loss	12 Months Ended
	Dec. 31, 2020
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, 2019 and 2020 are as follows: 2019 2020 Current Non-current Current Non-current In millions of won Financial assets at fair value through profit or loss Beneficiary Certificate ￦ 894 160,952 1,313 155,122 Cooperative — 5,155 — 5,692 Other(*) 130,491 244,857 1,194,788 312,401 131,385 410,964 1,196,101 473,215 Financial assets designated as at fair value through profit or loss Debt with embedded derivatives — 150,916 — 212,066 Other — 53,996 — — — 204,912 — 212,066 ￦ 131,385 615,876 1,196,101 685,281 (*) ‘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, 2019 and 2020 are as follows: 2019 2020 In millions of won Beneficiary Certificate ￦ 12,458 6,127 Cooperative 76 645 Debt with embedded derivatives 2,697 3,598 Other 17,002 30,329 ￦ 32,233 40,699

Financial Assets at Fair Valu_2

Financial Assets at Fair Value through Other Comprehensive Income	12 Months Ended
	Dec. 31, 2020
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, 2019 and 2020 are as follows: 2019 Beginning Acquisition Disposal Valuation Others Ending In millions of won Listed ￦ 210,055 — — (11,734 ) 2,880 201,201 Unlisted 189,439 1,876 (19,315 ) 3,715 2,254 177,969 399,494 1,876 (19,315 ) (8,019 ) 5,134 379,170 Current financial assets at fair value through other comprehensive income ￦ — — — — — — Non-current 399,494 1,876 (19,315 ) (8,019 ) 5,134 379,170 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 379,170 2,900 (5 ) (30,937 ) 7,431 358,559 (2) Financial assets at fair value through other comprehensive income as of December 31, 2019 and 2020 are as follows: 2019 Shares Ownership Acquisition Book value Fair value In millions of won Listed Korea District Heating Corp. 2,264,068 19.55 % ￦ 173,201 107,090 107,090 Ssangyong Motor Co., Ltd. 38,568 0.03 % 428 80 80 SM Korea Line Corp. 18 0.00 % 1 — — Namkwang Engineering & Construction Co., Ltd. 121 0.00 % 15 1 1 Bumyang Construction Co., Ltd. 35 0.00 % 2 — — Elcomtec Co., Ltd. 32,875 0.04 % 217 52 52 Pan Ocean Co., Ltd. 1,492 0.00 % 14 7 7 Dongbu Corp. 955 0.00 % 12 8 8 KSP Co., Ltd. 22,539 0.06 % 24 40 40 STX Heavy Industries Co., Ltd. 8,639 0.03 % 213 26 26 Codes Combine Co., Ltd. 291 0.00 % 1 1 1 PT Adaro Energy Tbk 480,000,000 1.50 % 65,028 62,026 62,026 Energy Fuels Inc. 1,711,814 1.91 % 16,819 3,764 3,764 Bunji Corporation Limited 99,763 0.07 % 18,445 — — Denison Mines Corp. 58,284,000 10.42 % 84,134 27,903 27,903 Fission 3.0 75,000 0.14 % — 5 5 Fission Uranium Corp. 800,000 0.16 % 785 199 199 359,339 201,202 201,202 Unlisted Intellectual Discovery Co., Ltd. 1,000,000 6.00 % ￦ 5,000 954 954 Hwan Young Steel Co., Ltd. 10,916 0.14 % 1,092 97 97 Sambo Auto . Co., Ltd. 15,066 0.02 % 38 38 38 Mobo Co., Ltd. 504 0.00 % 14 14 14 Dae Kwang Semiconductor Co., Ltd. 589 0.07 % 6 6 6 Sanbon Department Store 828 0.01 % 124 3 3 Miju Steel Mfg. Co., Ltd. 1,097 0.23 % 50 50 50 Sungwon Co., Ltd. 117 0.07 % 15 15 15 Hana Civil Engineering Co., Ltd. 23 0.00 % 1 1 1 KC Development Co., Ltd. 839 0.02 % 6 6 6 Imhwa Corp. 329 0.11 % 5 5 5 Dalim Special Vehicle Co., Ltd. 58 0.08 % 10 10 10 ASA Jeonju Co., Ltd. 34,846 1.34 % 697 69 69 Moonkyung Silica Co., Ltd. 42 0.56 % — — — Sungkwang Timber Co., Ltd. 3 0.08 % 5 5 5 Yongbo Co., Ltd. 61 0.20 % 3 3 3 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 2019 Shares Ownership Acquisition Book value Fair value In millions of won MSE Co., Ltd. 429 0.13 % ￦ 9 9 9 Ilrim Nano Tec Co., Ltd. 1,520 0.07 % 15 15 15 Youngjin Hi-Tech 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 11 11 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 Seungri Enterprise Co., Ltd. 93 0.05 % 3 3 3 Onggane Food Co., Ltd 5 0.07 % 1 1 1 Shin-E 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 % 27 27 27 Yuil Industrial Electronics Co., Ltd. 804 0.32 % 16 16 16 DN Tek Inc. 12,401 0.29 % 62 6 6 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 % 147 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 2019 Shares Ownership Acquisition Book value Fair value In millions of won Yoo-A 105 0.20 % ￦ 11 11 11 Dung Hwan Co., Ltd. 531 0.02 % 5 5 5 Hurim Biocell Co., Ltd. 1,021 0.00 % 5 5 5 Smart Power Co., Ltd. 133,333 4.14 % 200 200 200 Sunjin Power Tech Co., Ltd. 4,941 0.92 % 247 32 32 Haseung Industries Co.,Ltd. 55 0.62 % 28 28 28 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 % 23 23 23 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 % 135 1 1 HyoDong Development Co., Ltd. 128 0.15 % 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 Dong Yang Metal Co., Ltd. 2,951 1.97 % 161 148 148 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 % 11 3 3 Borneo International Furniture Co., Ltd. 4,000 0.16 % 97 13 13 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 Echoroba Co.,Ltd. 157 0.02 % 3 3 3 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 2019 Shares Ownership Acquisition Book value Fair value In millions of won 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. 64 0.07 % 4 4 4 Possbell Engineering Co., Ltd. 36 0.64 % 1 1 1 Airtech Information communication Co., Ltd 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 % 229,255 166,863 166,863 PT. Cirebon Energi Prasarana 22,420 10.00 % 2,612 2,596 2,596 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 KMT Co., Ltd. 1,411 0.93 % 21 21 21 TheYeonriji Co., Ltd. 116 0.10 % 6 6 6 Flusys Co., Ltd. 9 0.08 % 2 2 2 DongSeo Electronics Co., Ltd. 323 0.07 % 16 16 16 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 AID Co., Ltd. 1,212 0.57 % 36 36 36 Changwon Eco-friendly 3 0.01 % — — — Kumo Hitech Co., Ltd. 6,697 0.53 % 100 100 100 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 22 0.39 % 22 22 22 Keum Mun Industry Co., Ltd. 1,320 0.97 % 330 56 56 2019 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 SIE Co., Ltd. 12 0.02 % 1 1 1 Sejin Hightech Co., Ltd. 17,980 0.16 % 18 18 18 Namcheong Corp. 7,096 0.28 % 284 11 11 Eun Sung Enterprise Co. 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 Bugook Cast Iron Co. 135 0.71 % 14 14 14 Ilwoo Steel Co., Ltd. 41 0.28 % 17 17 17 Dong-un 1,159 6.28 % 81 81 81 Wongwang Door Corp. 575 1.00 % 29 29 29 Seobu Highway Solar Co., Ltd. 19,460 10.00 % 192 192 192 Dongbu Highway Solar Co., Ltd. 19,020 4.99 % 192 192 192 Muan sunshine solar power plant 298,300 19.00 % 1,492 1,492 1,492 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 DMC Co., Ltd. 5,831 0.02 % 38 38 38 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 % 9 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 Millenium Co., Ltd. 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 Shinhan Sangi Co., Ltd. 29 0.20 % 4 4 4 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 2019 Shares Ownership Acquisition Book value Fair value In millions of won Shinwonn Toptech Co., Ltd. 834 0.51 % ￦ 83 83 83 KMLC Co., Ltd. 281 0.14 % 22 22 22 Seinfood Co., Ltd. 13 0.17 % 7 7 7 TaeSung Eco-Tech. 1,368 4.55 % 34 34 34 Kukex Inc. 639 0.05 % 3 3 3 Youngshin Plu Co., Ltd. 104 0.12 % 5 5 5 Chang won Engineering Co., Ltd. 22 0.00 % 4 4 4 Samsung Silup Co., Ltd. 47 0.19 % 5 5 5 Samwon Bio Tech Co., Ltd. 390 0.25 % 6 6 6 Izu Korea Co., Ltd. 48 0.00 % 2 2 2 Dongdo CNP Co., Ltd. 234 0.36 % 6 6 6 Hando Precision Co.,Ltd 38 0.26 % 4 4 4 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 0.09 % 141 141 141 TCT Co., Ltd. 3,277 0.55 % 82 82 82 E-Won 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 0.00 % 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 Dong Hwan Co., Ltd. 25 0.02 % 1 1 1 266,717 177,968 177,968 ￦ 626,056 379,170 379,170 (*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 for the year ended December 31, 2019. 2020 Shares Ownership Acquisition 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 Co., Ltd. 32,875 0.04 % 217 49 49 Pan Ocean Co., Ltd. 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 Co., Ltd. 15,066 0.02 % 38 38 38 Mobo Co., Ltd. 504 0.00 % 14 14 14 Dae Kwang Semiconductor Co., Ltd. 589 0.07 % 6 6 6 Sanbon Department Store 828 0.01 % 124 3 3 Miju Steel Mfg. Co., Ltd. 1,097 0.23 % 50 50 50 Sungwon Co., Ltd. 117 0.07 % 15 15 15 KC Development Co., Ltd. 839 0.02 % 6 6 6 Imhwa Corp. 329 0.11 % 5 5 5 Dalim Special Vehicle Co., Ltd. 58 0.08 % 10 10 10 ASA Jeonju Co., Ltd. 34,846 1.34 % 697 69 69 Moonkyung Silica Co., Ltd. 42 0.56 % — — — 2020 Shares Ownership Acquisition Book value Fair value In millions of won 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 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 Seungri Enterprise Co., Ltd. 93 0.05 % 3 3 3 Shin-E 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 2020 Shares Ownership Acquisition Book value Fair value In millions of won 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 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 2020 Shares Ownership Acquisition Book value Fair value In millions of won 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 Information communication Co., Ltd 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 AID Co., Ltd. 1,212 0.57 % 36 36 36 Changwon Eco-friendly 3 0.01 % — — — Kumo Hitech Co., Ltd. 6,697 0.53 % 100 100 100 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 2020 Shares Ownership Acquisition Book value Fair value In millions of won KJ Alloy Co., Ltd. 368 0.20 % ￦ 7 7 7 SM Hi-tech 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 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 Millenium Co., Ltd. 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 2020 Shares Ownership Acquisition Book value Fair value In millions of won KMLC Co., Ltd. 281 0.14 % ￦ 22 22 22 Seinfood Co., Ltd. 13 0.17 % 7 7 7 TaeSung Eco-Tech. 1,368 4.55 % 34 34 34 Kukex Inc. 639 0.05 % 3 3 3 Youngshin Plus Co., Ltd. 104 0.12 % 5 5 5 Chang won Engineering Co., Ltd. 22 0.00 % 4 4 4 Samsung Silup Co., Ltd. 47 0.19 % 5 5 5 Samwon Bio Tech Co., Ltd. 390 0.25 % 6 6 6 Izu Korea Co., Ltd. 48 0.00 % 2 2 2 Dongdo CNP Co., Ltd. 234 0.36 % 6 6 6 Dae Bang Industry Co.,Ltd. 115 0.13 % 6 6 6 S.I.T. Co.,Ltd 2,213 0.44 % 22 22 22 Taejin Hiech Co., Ltd. 78 0.26 % 3 3 3 Headone Co.,Ltd. 69 0.12 % 7 7 7 Enaindustry Co., Ltd. 201 0.28 % 141 141 141 TCT Co., Ltd. 3,277 0.55 % 82 82 82 E-Won 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 % — — — WorldCnM Inc. 131 1.09 % 10 10 10 Superone Co., Ltd. 1,585 1.45 % 8 8 8 Deok-u 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 2020 Shares Ownership Acquisition Book value Fair value In millions of won 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 Co., Ltd. 8 0.02 % 1 1 1 Ajin KSB Co., Ltd. 204 0.31 % 18 18 18 Sewon Ceramic Co., Ltd. 530 1.01 % 5 5 5 Choyang Tech Co., Ltd. 465 1.01 % 23 23 23 TK Co., Ltd. 307 0.70 % 15 15 15 Sungdo Co., Ltd. 130 1.10 % 52 52 52 KSM Tech 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 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 38 0.02 % 1 1 1 2020 Shares Ownership Acquisition Book value Fair value In millions of won 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 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 for the year ended December 31, 2020.

Financial Assets at Amortized C

Financial Assets at Amortized Cost	12 Months Ended
	Dec. 31, 2020
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, 2019 and 2020 are as follows: 2019 Financial assets at amortized cost Government grants Allowance for doubtful accounts Others Book value In millions of won Government bonds ￦ 1,609 — — — 1,609 Others 12,000 — — — 12,000 ￦ 13,609 — — — 13,609 Current ￦ 12,302 — — — 12,302 Non-current 1,307 — — — 1,307 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

Derivatives

Derivatives	12 Months Ended
	Dec. 31, 2020
Derivatives [Abstract]
Derivatives	12. Derivatives (1) Derivatives as of December 31, 2019 and 2020 are as follows: 2019 2020 Current Non-current Current Non-current In millions of won Derivative assets Currency forward ￦ 21 43,931 18,332 — Currency swap 27,597 229,258 11,193 127,386 —Trading — 111,026 — 82,931 —Hedging 27,597 118,232 11,193 44,455 Interest rate swap — 7,592 — 9,502 —Trading — 7,592 — 9502 —Hedging — — — — Others — 2,634 — — ￦ 27,618 283,415 29,525 136,888 Derivative liabilities Currency forward ￦ 7,081 — 10,014 4,977 Currency swap 59,327 45,184 36,088 232,669 —Trading — 13,250 — 93,245 —Hedging 59,327 31,933 36,088 139,424 Interest rate swap 451 50,756 3,782 66,451 —Trading — 26,610 2,192 22,687 —Hedging 451 24,147 1,590 43,764 Others(*1,2,3) 6,205 956 — 11,138 ￦ 73,064 96,896 49,884 315,235 (*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, 2020 are as follows: Contract date 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 Hana Bank 2014.04.10 2021.07.12 ￦ 55,120 USD 52,000 ￦ 1,060.00 Hana Bank 2014.04.28 2021.07.12 50,784 USD 48,000 1,058.00 Bank of America 2014.04.29 2021.07.12 105,400 USD 100,000 1,054.00 Hana Bank 2014.05.09 2021.07.12 104,600 USD 100,000 1,046.00 Hana Bank 2017.12.22 2021.07.12 ￦ 105,079 USD 100,000 ￦ 1,050.79 Korea Development Bank 2017.12.27 2021.07.12 104,849 USD 100,000 1,048.49 Shinhan Bank 2020.11.25 2021.01.29 895 USD 809 1,106.50 Woori Bank 2020.12.28 2021.01.28 53,371 USD 48,790 1,093.88 Shinhan Bank 2020.12.29 2021.01.25 27,776 USD 25,379 1,094.44 Shinhan Bank 2020.10.08 2021.01.04 7,836 USD 6,771 1,157.15 Shinhan Bank 2020.10.08 2021.01.05 7,586 USD 6,552 1,157.75 Shinhan Bank 2020.10.19 2021.01.18 10,498 USD 9,188 1,142.68 Shinhan Bank 2020.10.21 2021.01.19 7,633 USD 6,717 1,136.45 Shinhan Bank 2020.11.05 2021.02.02 6,471 USD 5,729 1,129.45 CCB 2020.11.30 2021.01.05 5,522 USD 5,000 1,104.45 Standard Chartered 2020.12.09 2021.01.14 3,248 USD 3,000 1,082.80 Mizuho Bank 2020.12.14 2021.01.20 2,180 USD 2,000 1,090.05 Hana Bank 2020.12.17 2021.01.25 5,456 USD 5,000 1,091.25 Korea Development Bank 2020.12.18 2021.01.28 5,469 USD 5,000 1,093.75 Woori Bank 2020.12.23 2021.02.02 5,540 USD 5,000 1,107.95 Hana Bank 2020.12.24 2021.02.08 3,303 USD 3,000 1,101.10 Morgan Stanley 2020.12.24 2021.02.09 5,504 USD 5,000 1,100.80 Standard Chartered 2020.12.28 2021.02.10 3,296 USD 3,000 1,098.50 Credit Agricole 2020.12.28 2021.02.15 3,284 USD 3,000 1,094.55 Nonghyup Bank 2020.12.29 2021.02.17 6,572 USD 6,000 1,095.30 Korea Development Bank 2020.12.30 2021.02.19 5,436 USD 5,000 1,087.16 Korea Development Bank 2020.12.15 2021.01.05 1,092 USD 1,000 1,092.10 HSBC 2020.12.23 2021.01.05 3,881 USD 3,500 1,108.85 HSBC 2020.12.24 2021.01.05 3,306 USD 3,000 1,101.95 HSBC 2020.12.24 2021.01.22 1,651 USD 1,500 1,100.80 HSBC 2020.12.29 2021.01.13 14,210 USD 13,000 1,093.10 Korea Development Bank 2020.12.29 2021.01.05 6,791 USD 6,200 1,095.35 Shinhan Bank 2020.12.30 2021.01.22 9,249 USD 8,500 1,088.10 MUFG 2020.12.29 2021.01.12 4,380 USD 4,000 1,095.05 BNP Paribas 2020.12.30 2021.01.19 4,351 USD 4,000 1,087.80 Nova Scotia 2020.09.18 2021.01.12 46,700 USD 40,000 1,167.50 Mizuho Bank 2020.09.18 2021.03.11 15,177 USD 13,000 1,167.45 HSBC 2020.09.18 2021.06.11 31,506 USD 27,000 1,166.90 HSBC 2020.10.19 2024.10.29 140,913 USD 125,000 1,127.30 Woori Bank 2020.12.03 2021.01.08 1,461 USD 1,330 1,098.70 Shinhan Bank 2020.12.04 2021.01.08 9,775 USD 9,000 1,086.15 Credit Agricole 2020.12.10 2021.01.08 3,915 USD 3,600 1,087.45 Standard Chartered 2020.12.17 2021.01.15 4,044 USD 3,700 1,093.10 Hana Bank 2020.12.23 2021.01.21 3,321 USD 3,000 1,107.15 Hana Bank 2020.12.24 2021.01.21 5,504 USD 5,000 1,100.70 Woori Bank 2020.12.28 2021.01.04 ￦ 19,076 USD 17,400 ￦ 1,096.30 Standard Chartered 2020.12.28 2021.01.15 6,577 USD 6,000 1,096.20 Shinhan Bank 2020.12.28 2021.01.29 9,870 USD 9,000 1,096.70 Credit Agricole 2020.12.30 2021.01.29 4,915 USD 4,500 1,092.30 Standard Chartered 2020.12.30 2021.01.29 4,344 USD 4,000 1,086.00 Woori Bank 2020.12.30 2021.02.05 8,691 USD 8,000 1,086.40 (3) Currency swap contracts which are not designated as hedging instruments as of December 31, 2020 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 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 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 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, 2020 are as follows: Counterparty Contract 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 Korea Development Bank 2016~2021 121,000 USD 100,000 2.15% 2.50% 1,210.00 Morgan Stanley 2016~2021 121,000 USD 100,000 3M Libor + 2.10% 2.50% 1,210.00 BNP Paribas 2016~2021 121,000 USD 100,000 3M Libor + 2.10% 2.50% 1,210.00 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 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 Hana Bank 2018~2021 212,960 USD 200,000 2.10% 3.00% 1,064.80 Korea Development Bank 2018~2021 212,960 USD 200,000 2.10% 3.00% 1,064.80 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, 2020 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% Hana Bank 2017~2021 200,000 2.45% 3M CD + 0.32% Nomura(*) 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% 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% (*) 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. (6) Interest rate swap contracts which are designated as hedging instruments as of December 31, 2020 are as follows: Counterparty Contract Contract amount Contract interest rate per annum Pay Receive In thousands Export-Import Bankof 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 69,509 4.16% 6M USD Libor KFW 2009~2027 USD 69,509 4.16% 6M USD Libor Export-Import Bankof Korea 2016~2036 USD 75,929 3.00% 6M USD Libor (7) Gain and loss on valuation and transaction of derivatives for the years ended December 31, 2018, 2019 and 2020 are as follows and included in finance income and expenses in the consolidated statements of comprehensive income (loss): Net income effects of valuation gain (loss) Net income effects of transaction gain (loss) Other comprehensive income (loss)(*) 2018 2019 2020 2018 2019 2020 2018 2019 2020 In millions of won Currency forward ￦ 12,632 24,265 (40,590 ) 23,991 12,488 (17,911 ) — — — Currency swap 145,088 310,732 (406,607 ) 123,670 110,813 93,557 (12,516 ) 38,802 105,642 - Trading 21,702 172,087 (108,090 ) 51,533 52,842 16,661 — — — - Hedging 123,386 138,645 (298,517 ) 72,137 57,971 76,896 (12,516 ) 38,802 105,642 Interest rate swap (2,949 ) (16,231 ) (1,845 ) (364 ) (36,886 ) (10,253 ) 6,087 (3,075 ) 5,578 - Trading (2,949 ) (15,647 ) (309 ) (364 ) (2,495 ) (11,975 ) — — —, - Hedging — (584 ) (1,536 ) — (34,391 ) 1,722 6,087 (3,075 ) 5,578 Other derivatives (1,568 ) (1,416 ) (6,673 ) — — — — — — ￦ 153,203 317,350 (455,715) 147,297 86,415 65,393 (6,429) 35,727 111,220 (*) For the year ended December 31, 2020, the net gain on valuation of derivatives designated as cash flow hedge of ￦64,561 million, net of tax, is included in other comprehensive income (loss).

Other Financial Assets

Other Financial Assets	12 Months Ended
	Dec. 31, 2020
Other Financial Assets [Abstract]
Other Financial Assets	13. Other Financial Assets (1) Other financial assets as of December 31, 2019 and 2020 are as follows: 2019 2020 Current Non-current Current Non-current In millions of won Loans ￦ 64,111 725,755 78,806 762,555 Less: Allowance for doubtful accounts (31 ) (15,063 ) (1 ) (20,266 ) Less: Present value discount (847 ) (35,218 ) (842 ) (30,090 ) Long-term / short-term financial instruments 1,351,971 608,256 1,483,482 578,621 ￦ 1,415,204 1,283,730 1,561,445 1,290,820 (2) Loans as of December 31, 2019 and 2020 are as follows: 2019 Face value Allowance for Present value discount Carrying value In millions of won Short-term loans Loans for tuition ￦ 33,636 — (847 ) 32,789 Loans for housing 17,113 — — 17,113 Other loans 13,362 (31 ) — 13,331 64,111 (31 ) (847 ) 63,233 2019 Face value Allowance for Present value discount Carrying value In millions of won Long-term loans Loans for tuition ￦ 419,905 — (35,197 ) 384,708 Loans for housing 199,454 — — 199,454 Loans for related parties 89,132 (4,930 ) — 84,202 Other loans 17,264 (10,133 ) (21 ) 7,110 725,755 (15,063 ) (35,218 ) 675,474 ￦ 789,866 (15,094 ) (36,065 ) 738,707 2020 Face value Allowance for Present value discount 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 (3) Changes in the allowance for doubtful accounts of loans for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Beginning balance ￦ 8,948 4,952 15,094 Bad debt expense 22 10,142 5,173 Other (4,018 ) — — Ending balance ￦ 4,952 15,094 20,267 (4) Long-term and short-term financial instruments as of December 31, 2019 and 2020 are as follows: 2019 2020 Current Non-current Current Non-current In millions of won Time deposits ￦ 1,034,971 257,857 996,265 160,433 CP 40,000 — — — CD 15,000 — 50,000 — RP 40,000 — 203,008 — Others 222,000 350,399 234,209 418,188 ￦ 1,351,971 608,256 1,483,482 578,621

Inventories

Inventories	12 Months Ended
	Dec. 31, 2020
Inventories [Abstract]
Inventories	14. Inventories Inventories as of December 31, 2019 and 2020 are as follows: 2019 Acquisition cost Valuation allowance Book value In millions of won Raw materials ￦ 3,790,443 (1,430 ) 3,789,013 Merchandises 340 — 340 Work-in-progress 165,073 — 165,073 Finished goods 58,280 — 58,280 Supplies 2,121,363 (4,369 ) 2,116,994 Inventories-in-transit 906,267 — 906,267 Other inventories 14,733 — 14,733 ￦ 7,056,499 (5,799 ) 7,050,700 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 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, 2018, 2019 and 2020 were ￦3,723 million , ￦4,872 million and ￦2,020 million, respectively. The amounts of loss from inventory valuation included in other gains or losses for the years ended December 31, 2018, 2019 and 2020 were ￦1,953 million, ￦3,127 million and ￦4,998 million, respectively.

Non-Financial Assets

Non-Financial Assets	12 Months Ended
	Dec. 31, 2020
Non-Financial Assets [Abstract]
Non-Financial Assets	15. Non-Financial Non-financial 2019 2020 Current Non-current Current Non-current In millions of won Advanced payments ￦ 147,784 2,694 169,737 32,693 Prepaid expenses 308,017 84,421 216,073 140,730 Others(*1) 750,576 79,814 634,348 72,969 ￦ 1,206,377 166,929 1,020,158 246,392 (*1) Details of others as of December 31, 2019 and 2020 are as follows: 2019 2020 Current Non-current Current Non-current In millions of won Greenhouse gasemissions rights ￦ 437,562 — 357,355 — Other quick assets(*2) 313,014 79,814 276,993 72,969 ￦ 750,576 79,814 634,348 72,969 (*2) The Company recognized an impairment loss of ￦49,201 million as it was determined that there is an objective evidence of impairment related to its rights to equity interest in Orano Expansion for the year ended December 31, 2019.

Consolidated Subsidiaries

Consolidated Subsidiaries	12 Months Ended
	Dec. 31, 2020
Consolidated Subsidiaries [Abstract]
Consolidated Subsidiaries	16. Consolidated Subsidiaries (1) Consolidated subsidiaries as of December 31, 2019 and 2020 are as follows: Percentage of ownership (%) Subsidiaries Key operation activities Location 2019 2020 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 % 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 Philippines Corporation Holding company PHILIPPINES 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(*7) Power generation USA 100.00 % 100.00 % DG Whitefield, LLC Power generation USA 100.00 % — Springfield 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 % 100.00 % PT. EWP Indonesia Holding company INDONESIA 99.96 % 99.96 % KEPCO Netherlands J3 B.V. Holding company NETHERLANDS 100.00 % 100.00 % Korea Offshore Wind Power Co., Ltd. Power generation KOREA 100.00 % 100.00 % Global One Pioneer B.V. Holding company NETHERLANDS 100.00 % 100.00 % Global Energy Pioneer B.V. Holding company NETHERLANDS 100.00 % 100.00 % Mira Power Limited(*3) Power generation PAKISTAN 76.00 % 76.00 % KOSEP Material Co., Ltd. Recycling fly ashes KOREA 86.22 % 86.22 % Commerce and Industry Energy Co., Ltd.(*4) 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. Operation of utility plant KOREA 50.00 % 50.00 % VI Carbon Professional Private Special Asset Investment Trust 1 Holding company KOREA 96.67 % 96.67 % Chitose Solar Power Plant LLC Power generation JAPAN 80.10 % 80.10 % KEPCO Energy Solution Co., Ltd. Energy service KOREA 100.00 % 100.00 % KEPCO Solar Co., Ltd. (formerly, Solar School Plant 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 (formerly, KEPCO-LG Holding company USA 70.00 % 100.00 % Mangilao Investment LLC Holding company USA 100.00 % 100.00 % KEPCO Mangilao Solar, LLC (formerly, KEPCO-LG Power generation USA 100.00 % 100.00 % Jeju Hanlim Offshore Wind Co., Ltd. Power generation KOREA 75.99 % 75.99 % 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 % 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 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 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(*6) 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 Facility maintenance PAKISTAN 100.00 % 100.00 % KOMIPO Europe B.V. Holding company NETHERLANDS 100.00 % 100.00 % Haenanum Energy Fund Holding company KOREA 99.64 % 99.64 % Paju Ecoenergy Co., Ltd. Power generation KOREA 89.00 % 89.00 % Guam Ukudu Power LLC Power generation USA — 100.00 % TS Energy No. 25 Co., Ltd. Power generation KOREA — 90.00 % KPS Partners Co., Ltd. Facility maintenance and service KOREA — 100.00 % KEPCO E&C Service Co., Ltd. Facility maintenance and service KOREA — 100.00 % Moha Solar Co., Ltd. Power generation KOREA — 100.00 % Ogiri Solar Power Co., Ltd. Power generation KOREA — 70.00 % KHNP USA LLC Holding company USA — 100.00 % KOMIPO Vanphong Power Service LLC Utility plant maintenance and others VIETNAM — 100.00 % Energy Innovation Fund I Holding company KOREA — 71.91 % (*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 through the shareholders’ agreement. (*3) As of the reporting date, the annual reporting period of all subsidiaries is December 31, except for Mira Power Limited which is November 30. (*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) 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. (*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 the CEO and key management members. (*7) As 100% of the shares held were sold after the end of the reporting period, the assets of DG Fairhaven Power, LLC were classified as assets held-for-sale. (2) Subsidiaries newly included in and excluded from consolidation for the year ended December 31, 2020 are as follows: Subsidiaries included in consolidation during the year ended December 31, 2020. Subsidiaries Reason Guam Ukudu Power LLC Newly established TS Energy No. 25 Co., Ltd. New investment KPS Partners Co., Ltd. Newly established KEPCO E&C Service Co., Ltd. Newly established Moha Solar Co., Ltd. New investment Ogiri Solar Power Co., Ltd. Newly established KHNP USA LLC Newly established KOMIPO Vanphong Power Service LLC Newly established Energy Innovation Fund I Additional acquisition BSK E-New Newly established Subsidiaries excluded from consolidation during the year ended December 31, 2020. Subsidiaries Reason EWP Philippines Corporation Liquidation DG Whitefield, LLC Sale of shares Springfield Power, LLC Sale of shares (3) Summary of financial information of consolidated subsidiaries as of and for the years ended December 31, 2019 and 2020 are as follows: 2019 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won Korea Hydro & Nuclear Power Co., Ltd. ￦ 59,570,219 33,917,275 8,969,072 306,007 Korea South-East Power Co., Ltd. 10,938,358 5,866,642 5,385,387 41,006 Korea Midland Power Co., Ltd. 12,684,828 8,977,766 4,479,707 (28,449 ) Korea Western Power Co., Ltd. 10,514,438 6,637,451 4,448,992 (46,061 ) Korea Southern Power Co., Ltd. 10,884,799 6,608,301 5,084,907 (41,342 ) Korea East-West Power Co., Ltd. 9,724,311 5,022,921 4,855,964 56,698 KEPCO Engineering & Construction Company, Inc. 735,207 242,994 448,635 26,398 KEPCO Plant Service & Engineering Co., Ltd. 1,356,983 294,757 1,244,613 157,737 KEPCO Nuclear Fuel Co., Ltd. 831,604 429,799 309,055 24,618 KEPCO KDN Co., Ltd. 604,458 159,807 625,567 42,205 KEPCO International HongKong Ltd. 138,942 633 — 3,330 KEPCO International Philippines Inc. 107,224 371 — 67,991 KEPCO Gansu International Ltd. 10,448 545 — (20 ) KEPCO Philippines Holdings Inc. 200,503 6,656 — 66,200 KEPCO Philippines Corporation 6,706 332 — (52 ) KEPCO Ilijan Corporation 371,377 56,156 95,072 40,818 KEPCO Lebanon SARL 1,835 9,786 — 255 KEPCO Neimenggu International Ltd. 200,858 — — (354 ) KEPCO Shanxi International Ltd. 538,604 208,895 — 151 KOMIPO Global Pte Ltd. 269,302 463 — 10,400 KEPCO Netherlands B.V. 122,577 101 — 948 Korea Imouraren Uranium Investment Corp. 14,173 111 — (49,716 ) KEPCO Australia Pty., Ltd. 364 14 — (395,914 ) KOSEP Australia Pty., Ltd. 32,782 2,911 15,514 3,935 KOMIPO Australia Pty., Ltd. 40,898 2,909 15,514 3,766 KOWEPO Australia Pty., Ltd. 44,182 5,772 15,514 2,761 KOSPO Australia Pty., Ltd. 37,254 5,012 15,514 2,638 KEPCO Middle East Holding Company 102,164 87,834 — 5,934 Qatrana Electric Power Company 490,723 322,857 20,773 21,807 2019 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won KHNP Canada Energy, Ltd. ￦ 44,639 43 — (10 ) KEPCO Bylong Australia Pty., Ltd. 45,207 355,163 — (220,909 ) Korea Waterbury Uranium Limited Partnership 20,717 167 — (77 ) KEPCO Holdings de Mexico 187 25 — (14 ) KST Electric Power Company 539,952 449,459 55,783 (20,797 ) KEPCO Energy Service Company 2,262 1,995 5,984 (481 ) KEPCO Netherlands S3 B.V. 50,352 49 — 2,637 PT. KOMIPO Pembangkitan Jawa Bali 12,391 5,719 18,722 4,312 PT. Cirebon Power Service 2,089 313 8,049 406 KOWEPO International Corporation — 10 — (2 ) KOSPO Jordan LLC 17,489 1,521 10,878 2,634 EWP Philippines Corporation 1,691 888 — (111 ) EWP America Inc.(*1) 66,622 2,619 21,719 (6,497 ) KNF Canada Energy Limited 1,933 24 — (48 ) EWP Barbados 1 SRL 279,295 1,031 2,914 2,368 Gyeonggi Green Energy Co., Ltd. 194,425 159,078 13,717 (73,394 ) PT. Tanggamus Electric Power 228,601 195,826 2,256 (4,529 ) Gyeongju Wind Power Co., Ltd. 113,745 75,427 15,548 3,384 KOMIPO America Inc. 9,424 593 118 (1,033 ) KOSEP USA, Inc. 1 5,147 — (119 ) PT. EWP Indonesia 34,455 5 — 5,124 KEPCO Netherlands J3 B.V. 120,006 74 — (79 ) Korea Offshore Wind Power Co., Ltd. 284,495 117,527 — (12,768 ) Global One Pioneer B.V. 180 73 — (86 ) Global Energy Pioneer B.V. 348 80 — (90 ) Mira Power Limited 356,111 285,577 — (971 ) KOSEP Material Co., Ltd. 2,788 1,186 3,357 22 Commerce and Industry Energy Co., Ltd. 90,637 43,985 32,728 (7,532 ) KEPCO KPS Philippines Corp. 5,198 1,341 6,246 2 KOSPO Chile SpA 134,827 49,183 — (456 ) PT. KOWEPO Sumsel Operation And Maintenance Services 135 262 — (1,104 ) Hee mang sunlight Power Co., Ltd. 12,185 8,545 643 75 Fujeij Wind Power Company 218,333 196,964 — 5,515 KOSPO Youngnam Power Co., Ltd. 398,495 307,226 318,338 3,514 VI Carbon Professional Private Special Asset Investment Trust 1 3,002 — — 12 Chitose Solar Power Plant LLC 121,457 106,254 17,103 5,480 KEPCO Energy Solution Co., Ltd. 308,188 2,142 2,843 2,805 2019 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won KEPCO Solar Co., Ltd. (formerly, Solar School Plant Co., Ltd.) ￦ 208,730 3,269 1,962 2,553 KOSPO Power Services Ltda. 3,244 1,564 10,013 452 Energy New Industry Specialized Investment Private Investment Trust(*2) 100,116 17,359 2,418 (7,735 ) KOEN Bylong Pty., Ltd. — 39 — (14 ) KOMIPO Bylong Pty., Ltd. 4 43 — (14 ) KOWEPO Bylong Pty., Ltd. 4 40 — (12 ) KOSPO Bylong Pty., Ltd. 4 40 — (12 ) EWP Bylong Pty., Ltd. 4 40 — (12 ) KOWEPO Lao International 5,430 575 4,308 1,584 KEPCO US Inc. 17,231 — — — KEPCO Alamosa LLC 33,515 183 145 (311 ) KEPCO Solar of Alamosa, LLC (formerly, Cogentrix of Alamosa, LLC) 65,468 50,348 8,739 (1,902 ) KEPCO-LG 27,439 30,287 — (1,240 ) Mangilao Investment LLC 39,972 — — — KEPCO-LG 39,373 11 — (524 ) Jeju Hanlim Offshore Wind Co., Ltd. 14,328 558 — (2,459 ) PT. Siborpa Eco Power 11,574 71 — (1,165 ) PT. Korea Energy Indonesia 1,592 121 2,462 323 KOLAT SpA 31,178 167 656 (296 ) KEPCO California, LLC 44,074 936 358 (513 ) KEPCO Mojave Holdings, LLC 103,815 69,544 — (4,215 ) Incheon Fuel Cell Co., Ltd. 22,669 475 — (1,010 ) KOEN Service Co., Ltd. 5,347 4,252 25,890 543 KOMIPO Service Co., Ltd. 3,327 2,622 24,556 146 KOWEPO Service Co., Ltd. 4,228 3,302 23,982 389 KOSPO Service Co., Ltd. 3,493 2,788 18,741 135 EWP Service Co., Ltd. 4,786 4,064 20,837 162 PT. KOMIPO Energy Indonesia 2,647 196 1,392 79 KNF partners Co., Ltd. 1,378 890 3,383 187 KOSPO USA Inc. 5,896 127 — (1,408 ) Nambu USA LLC 245 1 — 245 Tamra Offshore Wind Power Co., Ltd. 156,708 121,724 19,670 1,154 KEPCO MCS Co., Ltd. 26,510 22,151 129,393 3,408 KEPCO FMS Co., Ltd. 11,336 10,638 37,627 198 Firstkeepers Co., Ltd. 1,552 2,800 121 (2,239 ) Secutec Co., Ltd. 322 229 — (597 ) SE Green Energy Co., Ltd. 132,727 105,619 — 816 2019 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won KEPCO Mangilao America LLC ￦ — — — — Mangilao Intermediate Holdings LLC 13,220 12,774 — (66 ) KEPCO CSC Co., Ltd. 837 51 — (14 ) KOAK Power Limited 15,930 — — — KOMIPO Europe B.V. 7,362 — — (286 ) Haenanum Energy Fund 28,101 1 — 1 Paju Ecoenergy Co., Ltd. 53,839 — — — (*1) Financial information of EWP America Inc. includes that of six other subsidiaries, EWP Renewable Corporation, DG Fairhaven Power, LLC, DG Whitefield, LLC, Springfield 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 three other subsidiaries, BSK E-New e-New e-New 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 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. (formerly, Solar School Plant 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 (formerly, KEPCO-LG 25,785 28,924 — (502 ) Mangilao Investment LLC 38,090 14 — (15 ) KEPCO Mangilao Solar, LLC (formerly, KEPCO-LG 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 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 (4) Significant restrictions on abilities to subsidiaries are as follows: Company Nature and extent of any significant restrictions Gyeonggi Green Energy Co., Ltd. Acquisition or disposal of assets of more than ￦35 billion, change in the capacity of cogeneration units (except for the change due to performance improvement of equipment, maintenance) will require unanimous consent of all directors of the company. KOSPO Youngnam Power Co., Ltd. Dividends can only be paid when all conditions of the loan agreement are satisfied, or prior written consent of financial institutions is obtained. Company’s shares cannot be wholly or partially transferred without prior written consent of 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 supply certificate can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions is obtained. Company Nature and extent of any significant restrictions Korea Offshore Wind Power Co., Ltd. Principals and interest payments on subordinated loans or payments for dividends and settlement amounts for renewable energy supply certificate can only be paid when all conditions of the loan agreement are satisfied and prior written consent of financial institutions are obtained. Shares cannot be wholly or partially transferred without prior written consent of financial institutions. (5) As of December 31, 2020, the Company has following entitlements in relation to its subsidiaries as per its shareholder’s agreements: Company Nature and extent of any 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. (6) Details of non-controlling 2018 Description KEPCO Ilijan Corporation KEPCO Plant Service & Engineering Co., Ltd. KEPCO Engineering & Construction Company, Inc. Others Total In millions of won Percentage of ownership 49.00 % 49.00 % 33.92 % Current assets ￦ 163,622 628,725 281,390 956,928 2,030,665 Non-current 267,822 646,640 490,090 2,760,500 4,165,052 Current liabilities (16,819 ) (270,097 ) (248,402 ) (559,552 ) (1,094,870 ) Non-current (36,594 ) (26,331 ) (61,698 ) (1,933,583 ) (2,058,206 ) Net assets 378,031 978,937 461,380 1,224,293 3,042,641 Book value of non-controlling 185,235 479,679 156,500 680,963 1,502,377 Sales 99,844 1,239,604 433,701 966,037 2,739,186 Profit for the period 49,631 160,791 12,937 92,457 315,816 Profit for the period attributable to non-controlling 24,319 78,788 4,388 28,475 135,970 Cash flows from operating activities 92,822 129,700 81,042 110,448 414,012 Cash flows from investing activities (4,452 ) (123,593 ) (50,569 ) 35,167 (143,447 ) Cash flows from financing activities before dividends to non-controlling (53,733 ) (33,737 ) (14,591 ) (374,669 ) (476,730 ) Dividends to non-controlling (51,626 ) (32,414 ) (2,839 ) (23,452 ) (110,331 ) Effect of exchange rate fluctuation 2,840 (124 ) 31 1,304 4,051 Net increase (decrease) of cash and cash equivalents (14,149 ) (60,168 ) 13,074 (251,202 ) (312,445 ) 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 ) (7) Changes in goodwill (i) Details of goodwill as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Acquisition cost ￦ 97,977 98,166 Less: Accumulated impairment — — Carrying book value ￦ 97,977 98,166 (ii) Changes in goodwill for the years ended December 31, 2019 and 2020 are as follows: 2019 Beginning Increase Decrease Ending In millions of won Acquisition cost ￦ 2,582 95,395 — 97,977 Less: Accumulated impairment — — — — Carrying book value 2,582 95,395 — 97,977 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 (8) Disposals of subsidiaries The Company has completed the liquidation process of EWP Philippines Corporation, and has sold shares of DG Whitefield, LLC and Springfield Power, LLC as of December 31, 2020. Also, the Company has completed the liquidation process of KEPCO Singapore Holdings Pte., Ltd., and Korea Electric Power Nigeria Ltd. as of December 31, 2019. Garolim Tidal Power Plant Co., Ltd., which was under the process of liquidation as of December 31, 2019, completed liquidation process during the year ended December 31, 2020. (i) The fair value of proceeds from disposal for the years ended December 31, 2018, 2019 and 2020, respectively, are as follows: 2018 2019 2020 In millions of won Consideration received in cash and cash equivalents ￦ 160 4 389 Net assets transferred due to liquidation — — 1,084 Total ￦ 160 4 1,473

Investments in Associates and J

Investments in Associates and Joint Ventures	12 Months Ended
	Dec. 31, 2020
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, 2019 and 2020 are as follows: 2019 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 1,693,967 Korea Electric Power Industrial Development Co., Ltd. Electricity metering and others KOREA 29.00 % 4,727 25,393 YTN Co., Ltd. Broadcasting KOREA 21.43 % 59,000 39,747 Cheongna Energy Co., Ltd. Generating and distributing vapor and hot/cold water KOREA 43.90 % 48,353 1,411 Gangwon Wind Power Co., Ltd.(*2) Power generation KOREA 15.00 % 5,725 12,327 Hyundai Green Power Co., Ltd. Power generation KOREA 29.00 % 88,885 124,253 Korea Power Exchange(*5) Management of power market and others KOREA 100.00 % 127,839 258,899 Hyundai Energy Co., Ltd.(*7) Power generation KOREA 30.66 % 71,070 — Ecollite Co., Ltd. Artificial light-weight aggregate KOREA 36.10 % 1,516 — Taebaek Wind Power Co., Ltd. Power generation KOREA 25.00 % 3,810 7,039 Taebaek Guinemi Wind Power Co., Ltd. Power generation KOREA 25.00 % 3,420 2,553 Pyeongchang Wind Power Co., Ltd. Power generation KOREA 25.00 % 3,875 5,877 Daeryun Power Co., Ltd.(*2) Power generation KOREA 9.34 % 40,854 26,247 Changjuk Wind Power Co., Ltd. Power generation KOREA 30.00 % 3,801 8,520 KNH Solar Co., Ltd. Power generation KOREA 27.00 % 1,296 2,382 SPC Power Corporation Power generation PHILIPPINES 38.00 % 20,635 63,583 Gemeng International Energy Co., Ltd. Power generation CHINA 34.00 % 413,153 670,896 PT. Cirebon Electric Power Power generation INDONESIA 27.50 % 40,365 123,425 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 29,355 PT. Bayan Resources TBK Resources development INDONESIA 20.00 % 615,860 445,141 S-Power Power generation KOREA 49.00 % 132,300 115,784 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 72,935 Hadong Mineral Fiber Co., Ltd.(*2) Recycling fly ashes KOREA 8.33 % 50 — Green Biomass Co., Ltd.(*9) Power generation KOREA 7.85 % 714 108 PT. Mutiara Jawa Manufacturing and operating floating coal terminal INDONESIA 29.00 % 2,978 1,438 Samcheok Eco Materials Co., Ltd.(*8) Recycling fly ashes KOREA 2.35 % 686 — Noeul Green Energy Co., Ltd. Power generation KOREA 29.00 % 1,740 6,610 Naepo Green Energy Co., Ltd. Power generation KOREA 41.67 % 29,200 — Goseong Green Power Co., Ltd.(*2) Power generation KOREA 1.12 % 2,900 2,340 Gangneung Eco Power Co., Ltd.(*2) Power generation KOREA 1.61 % 2,900 2,430 Shin Pyeongtaek Power Co., Ltd. Power generation KOREA 40.00 % 72,000 66,956 Haeng Bok Do Si Photovoltaic Power Co., Ltd. Power generation KOREA 28.00 % 194 215 Dongducheon Dream Power Co., Power generation KOREA 33.61 % 148,105 76,547 Jinbhuvish Power Generation Pvt. Power generation INDIA 5.16 % ￦ 9,000 — Daejung Offshore Wind Power Co., Power generation KOREA 49.90 % 5,190 2,361 GS Donghae Electric Power Co., Power generation KOREA 34.00 % 204,000 255,983 Daegu Photovoltaic Co., Ltd. Power generation KOREA 29.00 % 1,230 2,060 Busan Green Energy Co., Ltd. Power generation KOREA 29.00 % 5,243 10,637 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 1,063 Korea Nuclear Partners Co., Ltd. Electric material agency KOREA 29.00 % 290 — Korea Electric Power Corporation Developing electric enterprises KOREA 98.09 % 51,500 41,126 Energy Infra Asset Management Co., Asset management KOREA 9.90 % 297 791 Daegu clean Energy Co., Ltd. Renewable power generation KOREA 28.00 % 140 13 Yaksu ESS Co., Ltd. Installing ESS related equipment KOREA 29.00 % 210 516 Nepal Water & Energy Development Company Private Limited(*12) Construction and operation of utility plant NEPAL 57.76 % 35,571 31,145 Gwangyang Green Energy Co., Ltd. Power generation KOREA 20.00 % 2,000 948 PND solar Co., Ltd. Power generation KOREA 29.00 % 1,250 1,144 Hyundai Eco Energy Co., Ltd.(*2) Power generation KOREA 19.00 % 3,610 3,781 YeongGwang Yaksu Wind Electric Co., Power generation KOREA 9.63 % 533 386 Green Energy Electricity Generation Co., Ltd. Power generation KOREA 29.00 % 1,189 163 Korea Energy Solutions Co., Ltd. R & D KOREA 20.00 % 300 259 ITR Co., Ltd. R & D KOREA 20.00 % 50 33 Structure test network Co., Ltd. Technical testing and consulting KOREA 20.00 % 25 21 Namjeongsusang Solar Power Operation Co., Ltd.(*17) Power generation KOREA 15.00 % 969 812 Indeck Niles Development, LLC(*22) Power generation USA 50.00 % — — Indeck Niles Asset Management, LLC Power generation USA 33.33 % — 87 Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 Holding company KOREA 49.00 % 7,105 7,126 Suwon New Power Co., Ltd. Power generation KOREA 39.90 % 798 798 KPGE Inc. Power generation materials business KOREA 29.00 % 287 287 Gwangbaek Solar Power Investment Co., Ltd.(*20) Power generation KOREA 19.00 % 2,054 2,054 Go deok Clean Energy Co., Ltd.(*19) Fuel cell generation KOREA 61.00 % 1,830 1,830 2,539,956 4,251,802 <Joint ventures> KEPCO-Uhde Inc.(*6) Power generation KOREA 52.80 % ￦ 11,355 134 Shuweihat Asia Power Investment B.V. Holding company NETHERLANDS 49.00 % 44,405 18,318 Shuweihat Asia Operation & Maintenance Company(*6) Maintenance of utility plant CAYMAN 55.00 % 30 1,408 Waterbury Lake Uranium L.P. Resources development CANADA 33.41 % 26,602 20,562 ASM-BG Power generation BULGARIA 50.00 % 16,101 19,376 RES Technology AD Power generation BULGARIA 50.00 % 15,595 16,248 KV Holdings, Inc. Power generation PHILIPPINES 40.00 % 2,103 2,441 KEPCO SPC Power Corporation(*6) Construction and operation of utility plant PHILIPPINES 75.20 % 94,579 214,794 Gansu Datang Yumen Wind Power Co., Ltd. Power generation CHINA 40.00 % 16,621 8,149 Datang Chifeng Renewable Power Co., Ltd. Power generation CHINA 40.00 % 121,928 185,307 Datang KEPCO Chaoyang Renewable Power Co., Ltd. Power generation CHINA 40.00 % 39,872 41,024 Rabigh Electricity Company Power generation SAUDI ARABIA 40.00 % 109,743 109,096 Rabigh Operation & Maintenance Company Limited Maintenance of utility plant SAUDI ARABIA 40.00 % 70 6,879 Jamaica Public Service Company Limited Power generation JAMAICA 40.00 % 301,910 253,607 KW Nuclear Components Co., Ltd. Manufacturing KOREA 45.00 % 833 9,052 Busan Shinho Solar Power Co., Ltd. Power generation KOREA 25.00 % 2,100 5,045 Global Trade Of Power System Co., Ltd. Exporting products and technology of small or medium business by proxy KOREA 29.00 % 290 571 Expressway Solar-light Power Generation Co., Ltd. Power generation KOREA 29.00 % 1,856 2,883 Amman Asia Electric Power Power generation JORDAN 60.00 % 111,476 192,164 KAPES, Inc.(*6) R&D KOREA 51.00 % 5,629 10,832 Honam Wind Power Co., Ltd. Power generation KOREA 29.00 % 3,480 4,375 Jeongam Wind Power Co., Ltd.(*15) Power generation KOREA 40.00 % 5,580 4,437 Korea Power Engineering Service Co., Ltd.(*15) Construction and service KOREA 29.00 % 290 4,902 Chun-cheon Energy Co., Ltd. Power generation KOREA 29.90 % 52,700 34,872 Yeonggwangbaeksu Wind Power Co., Ltd.(*3) Power generation KOREA 15.00 % 3,000 3,040 Nghi Son 2 Power LLC Power generation VIETNAM 50.00 % 2,781 — Kelar S.A.(*6) Power generation CHILE 65.00 % 78,060 70,462 PT. Tanjung Power Indonesia Power generation INDONESIA 35.00 % 26,892 34,327 Incheon New Power Co., Ltd.(*24) Power generation KOREA 29.00 % 461 — Seokmun Energy Co., Ltd. Power generation KOREA 29.00 % 15,370 17,342 Daehan Wind Power PSC Power generation JORDAN 50.00 % 3,191 1,757 Barakah One Company(*11) Power generation UAE 18.00 % 118 — Nawah Energy Company(*11) Operation of utility plant UAE 18.00 % 296 285 MOMENTUM International thermonuclear experimental reactor construction management FRANCE 33.33 % ￦ 1 553 Daegu Green Power Co., Ltd.(*25) Power generation KOREA 29.00 % 46,225 22,824 Yeonggwang Wind Power Co., Ltd. Power generation KOREA 46.00 % 17,475 17,627 Chester Solar IV SpA Power generation CHILE 45.00 % 1,700 672 Chester Solar V SpA Power generation CHILE 45.00 % 525 146 Diego de Almagro Solar SpA Power generation CHILE 45.00 % 2,091 1,035 South Jamaica Power Company Limited Power generation JAMAICA 20.00 % 20,521 13,863 Daesan Green Energy Co., Ltd. Power generation KOREA 35.00 % 17,850 17,182 RE Holiday Holdings LLC Power generation USA 50.00 % 42,948 42,070 RE Pioneer Holdings LLC Power generation USA 50.00 % 27,891 31,156 RE Barren Ridge 1 Holdings LLC Power generation USA 50.00 % 28,021 42,916 RE Astoria 2 LandCo LLC Power generation USA 50.00 % 5,188 5,602 RE Barren Ridge LandCo LLC Power generation USA 50.00 % 2,187 1,966 Laurel SpA Power generation CHILE 45.00 % 1,222 595 KIAMCO KOWEPO Bannerton Hold Co Pty Ltd(*3) Power generation AUSTRALIA 12.37 % 4,095 4,024 Chile Solar JV SpA Power generation CHILE 50.00 % 37,689 34,859 Taebaek Gadeoksan Wind Power Co., Ltd. Power generation KOREA 37.78 % 8,500 7,846 Cheong-Song Noraesan Wind Power Co., Ltd. Power generation KOREA 29.01 % 3,200 3,043 Chester Solar I SpA Power generation CHILE 45.00 % 1,181 1,157 Solar Philippines Calatagan Corporation Power generation PHILIPPINES 38.00 % 47,903 48,930 Saemangeum Solar Power Co., Ltd.(*21) Power generation KOREA 81.00 % 10,000 8,324 Chungsongmeon BongSan wind power Co., Ltd. Power generation KOREA 29.00 % 2,900 2,764 Jaeun Resident Wind Power Plant Co., Ltd. Power generation KOREA 29.00 % 2,494 2,198 DE Energia SpA Power generation CHILE 49.00 % 8,364 8,665 Dangjin Eco Power Co., Ltd. Power generation KOREA 34.00 % 25,661 25,661 Haemodum Solar Co., Ltd. Power generation KOREA 49.00 % 2,940 2,940 Yangyang Wind Power Co., Ltd.(*16) Power generation KOREA 99.54 % 10,800 10,800 Horus Solar, S.A. De C.V.(*18) Renewable power generation MEXICO 14.95 % 3,403 3,403 Recursos Solares PV De Mexico II, S.A. De C.V.(*18) Renewable power generation MEXICO 14.95 % 672 672 Sunmex Renovables, S.A. De C.V.(*18) Renewable power generation MEXICO 14.95 % 222 222 Stavro Holding II A.B. Holding company SWEDEN 20.00 % 5,524 5,625 1,504,710 1,663,029 ￦ 4,044,666 5,914,831 (*1) The effective percentage of ownership is 21.57% 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) 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. (*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 influence on the entity. (*5) The effective percentage of ownership is 100%. However, the Government regulates the Company’s ability to make operating and financial decisions over the entity, as the Government requires maintaining arms-length transactions between KPX and the Company’s other subsidiaries. The Company can exercise significant influence by virtue of right to nominate directors to the board of directors of the entity. (*6) The effective percentage of ownership is 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. (*7) As of December 31, 2019, 15.64% of ownership of Hyundai Energy Co., Ltd. is held by NH Power ll Co., Ltd. and NH Bank. According to the shareholders’ agreement reached on March 2011, not only does the Company have a call option to acquire the investment in Hyundai Energy Co., Ltd. from NH Power ll Co., Ltd. and NH Bank with a certain rate of return, NH Power ll Co., Ltd. and NH Bank also have put options to dispose of their investment to the Company. In connection with this agreement, the Company applied the equity method on the investment in Hyundai Energy Co., Ltd. with 46.30% of ownership. (*8) 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. (*9) The effective percentage of ownership is less than 20% but the Company can exercise significant influence by virtue of its contractual right to appoint a director to the board of directors of the entity and the fact that the dominant portion of the investee’s sales transactions is generated from the Company. (*10) 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. (*11) The effective percentage of ownership is less than 20% but the Company has joint control over the entity as decisions on the major activities require the unanimous consent of the parties that collectively control the entity. (*12) 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. (*13) The effective percentage of ownership is 34.01% considering the conversion of redeemable convertible preferred stock into ordinary stock. (*14) Eumseong Natural Gas Power Co., Ltd. and Dangjin Eco Solar Power Co., Ltd. were established by spin-off spin-off, (*15) Daejung Offshore Wind Power Co., Ltd. and GS Donghae Electric Power Co., Ltd. are reclassified from joint ventures to associates, and Jeongam Wind Power Co., Ltd. and Korea Power Engineering Service Co., Ltd. are reclassified from associates to joint ventures during the year ended December 31, 2019. (*16) The temporary percentage of ownership is more than 50% due to differences in the timing of the payment. The Company is expected to exert significant influence after payment is completed in the first quarter of 2020. (*17) The effective percentage of ownership is less than 20%. However, the Company considers the major decision-making body to be the general decision of the board of directors, and the general decision of the board of directors can be passed only by two directors. Accordingly, the entities are classified as an associate. (*18) The effective percentage of ownership is less than 20%. However, according to the shareholders’ agreement, decisions on the major activities must be agreed to by all ownership parties. Accordingly, the entities are classified as joint ventures. (*19) Even though the effective percentage of ownership is more than 50%, the Company does not hold control over the entity according to its proportion to make decisions, which is less than 50%. 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. (*20) 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. (*21) The effective percentage of ownership is more than 50%. However, according to the shareholders’ agreement, all operation related decisions must be agreed by all ownership parties. Accordingly, the entity is classified as a joint venture. (*22) Although the investment amount is not paid as of December 31, 2019, the Company has an investment agreement on 50% of the interests. the Company can exercise significant influence by virtue of its contractual right to appoint a director to the board of directors of the entity. (*23) 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 is no business activities occurring. (*24) 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. (*25) Although the nominal percentage of ownership is 29.00%, the effective percentage of ownership is 52.24%, considering the interest of financial investors as a liability component. 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., 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 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 solar Co., Ltd. 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 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 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.S. 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 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 end

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	18. Property, Plant and Equipment (1) Property, plant and equipment as of December 31, 2019 and 2020 are as follows: 2019 Acquisition cost Government grants Accumulated depreciation Accumulated losses Book value In millions of won Land ￦ 13,848,063 (21,817 ) — — 13,826,246 Buildings 20,756,351 (61,920 ) (8,305,683 ) (4,962 ) 12,383,786 Structures 70,900,343 (186,554 ) (25,711,840 ) (9,633 ) 44,992,316 Machinery 89,224,339 (158,907 ) (38,865,392 ) (451,647 ) 49,748,393 Ships 3,104 — (2,903 ) — 201 Vehicles 309,829 (2,275 ) (239,128 ) (116 ) 68,310 Equipment 1,716,210 (241 ) (1,342,053 ) (42 ) 373,874 Tools 1,098,127 (403 ) (934,023 ) (40 ) 163,661 Construction-in- 28,584,806 (61,211 ) — (165,336 ) 28,358,259 Right-of-use 7,574,010 — (2,790,437 ) — 4,783,573 Asset retirement costs 11,690,188 — (4,169,238 ) (146,423 ) 7,374,527 Others 12,955,782 — (10,327,101 ) — 2,628,681 ￦ 258,661,152 (493,328 ) (92,687,798 ) (778,199 ) 164,701,827 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 (2) Changes in property, plant and equipment for the years ended December 31, 2019 and 2020 are as follows: 2019 Beginning balance Effect of change in accounting Acquisition Disposal Depreciation Impairment (*1,*4) Others (*2,*3) Ending balance In millions of won Land ￦ 13,554,292 — 40,752 (29,205 ) — (25,626 ) 307,850 13,848,063 (Government grants) (21,968 ) — — 151 — — — (21,817 ) Buildings 11,933,691 — 3,195 (23,409 ) (821,680 ) (1,293 ) 1,355,202 12,445,706 (Government grants) (63,189 ) — (592 ) — 6,214 — (4,353 ) (61,920 ) Structures 42,711,795 — 1,663 (470,230 ) (2,399,283 ) (1,234 ) 5,336,159 45,178,870 (Government grants) (190,854 ) — — 2,405 9,373 — (7,478 ) (186,554 ) Machinery 47,456,595 — 326,606 (248,951 ) (5,452,669 ) (12,247 ) 7,837,966 49,907,300 (Government grants) (173,242 ) — (1,050 ) 635 17,993 — (3,243 ) (158,907 ) Ships 302 — — — (100 ) — (1 ) 201 Vehicles 72,189 — 3,789 4,558 (33,650 ) — 23,699 70,585 (Government grants) (4,220 ) — (228 ) 5 2,170 — (2 ) (2,275 ) Equipment 382,859 — 47,532 (162 ) (199,376 ) (227 ) 143,489 374,115 (Government grants) (418 ) — (81 ) — 262 — (4 ) (241 ) Tools 192,675 — 20,956 (31 ) (87,708 ) — 38,172 164,064 (Government grants) (675 ) — — — 281 — (9 ) (403 ) Construction-in-progress 28,821,167 — 13,544,091 (199,853 ) — (8,828 ) (13,737,107 ) 28,419,470 (Government grants) (54,740 ) — 12,338 — — — (18,809 ) (61,211 ) Finance lease assets 195,730 (195,730 ) — — — — — — (Government grants) (26 ) 26 — — — — — — Right-of-use — 5,143,651 220,996 — (581,074 ) — — 4,783,573 Asset retirement costs 5,571,754 — — — (626,856 ) — 2,429,629 7,374,527 Others 2,359,477 — 1,388 (221 ) (800,653 ) (581 ) 1,069,271 2,628,681 ￦ 152,743,194 4,947,947 14,221,355 (964,308 ) (10,966,756 ) (50,036 ) 4,770,431 164,701,827 (*1) KEPCO Bylong Australia Pty., Ltd., 100% owned subsidiary, performed an impairment test over its land and others. The Company recognized the amount of the carrying amount in excess of its recoverable amount as an impairment loss. (*2) ‘Others’ include the amounts of assets acquired by the business combination. (see Note 51) (*3) ‘Others’ include the amounts reclassified from construction-in-progress (*4) As described in Note 2, the Company recognized impairment loss of ￦3,819 million related to Wolsong unit 1, Shin-Hanul unit 3 & 4 and reversal of impairment loss of ￦16,693 million related to Wolsong unit 1. 2020 Beginning balance 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

Investment Properties

Investment Properties	12 Months Ended
	Dec. 31, 2020
Investment Properties [Abstract]
Investment Properties	19. Investment Properties (1) Investment properties as of December 31, 2019 and 2020 are as follows: 2019 Acquisition cost Government grants Accumulated depreciation Book value In millions of won Land ￦ 129,897 — — 129,897 Buildings 64,590 (13 ) (35,894 ) 28,683 ￦ 194,487 (13 ) (35,894 ) 158,580 2020 Acquisition cost Government grants Accumulated depreciation 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 (2) Changes in investment properties for the years ended December 31, 2019 and 2020 are as follows: 2019 Beginning Depreciation Others Ending In millions of won Land ￦ 139,940 — (10,043 ) 129,897 Buildings 19,669 (5,070 ) 14,097 28,696 (Government grants) (50 ) 1 36 (13 ) ￦ 159,559 (5,069 ) 4,090 158,580 2020 Beginning Depreciation Others Ending balance 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 (3) Income and expenses related to investment properties for the years ended December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Rental income ￦ 9,782 8,335 Operating and maintenance expenses related to rental income (1,257 ) (1,453 ) Operating and maintenance expenses not related to rental income (3,812 ) — ￦ 4,713 6,882 (4) Fair value of investment properties as of December 31, 2019 and 2020 are as follows: 2019 2020 Book value Fair value Book value Fair value In millions of won Land ￦ 129,897 202,042 200,391 300,001 Buildings 28,683 38,046 24,804 44,597 ￦ 158,580 240,088 225,195 344,598 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, 2020
Construction Services Contracts [Abstract]
Construction Services Contracts	20. Construction Contracts (1) Changes in total contract amount in which revenue is not yet recognized for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 Beginning balance Increase (decrease)(*) Recognized as revenue Ending balance In millions of won Nuclear power plant construction in UAE and others ￦ 4,176,595 1,186,584 (1,742,391 ) 3,620,788 (*) For the year ended December 31, 2018, the increased balance of contracts from new orders and foreign exchange impact is ￦1,207,097 million and the decreased balance of contracts due to changes in scope of construction work is ￦20,513 million. 2019 Beginning balance Increase (decrease)(*) Recognized as revenue Ending balance 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 and foreign exchange impact is ￦390,224 million and the decreased balance of contracts due to changes in scope of construction work is ￦10,955 million. 2020 Beginning balance Increase (decrease)(*) Recognized as revenue Ending balance 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 and foreign exchange impact is ￦1,512,460 million and the decreased balance of contracts due to changes in scope of construction work is ￦282,701 million. (2) Accumulated earned revenue, expense and others related to the Company’s construction contracts in progress as of December 31, 2019 and 2020 are as follows: 2019 Accumulated earned revenue Accumulated expense Accumulated profit Unearned advance receipts In millions of won Nuclear power plant construction in UAE and others ￦ 20,971,487 19,566,647 1,404,840 — 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 (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, 2019 and 2020 are as follows: 2019 2020 Contract Contract liabilities(*2) Contract assets(*1) Contract liabilities(*2) In millions of won Nuclear power plant construction in UAE and others ￦ 53,827 73,420 79,662 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 ￦46,489 million and ￦39,063 million, as of December 31, 2019 and 2020, respectively. (*2) Included in non-financial

Intangible Assets other than Go

Intangible Assets other than Goodwill	12 Months Ended
	Dec. 31, 2020
Intangible Assets other than Goodwill [Abstract]
Intangible Assets other than Goodwill	21. Intangible Assets other than Goodwill (1) Intangible assets as of December 31, 2019 and 2020 are as follows: 2019 Acquisition cost Government grants Accumulated amortization Accumulated impairment losses Book value In millions of won Software ￦ 707,731 (235 ) (542,736 ) — 164,760 Licenses and franchises 3,398 — (3,398 ) — — Copyrights, patents rights and other industrial rights 102,828 — (40,389 ) (9,178 ) 53,261 Mining rights 584,969 — (28,456 ) (512,790 ) 43,723 Development expenditures 916,834 (1,492 ) (822,972 ) (19 ) 92,351 Intangible assets under development 73,335 (11,029 ) — (12,845 ) 49,461 Usage rights of donated assets and other 582,825 — (389,664 ) — 193,161 Leasehold rights 25,989 — (20,671 ) — 5,318 Greenhouse gas emissions rights 41,656 — — — 41,656 Others 557,749 (79 ) (119,446 ) (11,939 ) 426,285 ￦ 3,597,314 (12,835 ) (1,967,732 ) (546,771 ) 1,069,976 2020 Acquisition cost Government grants Accumulated amortization Accumulated impairment losses 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 (2) Changes in intangible assets for the years ended December 31, 2019 and 2020 are as follows: 2019 Beginning balance Acquisition Disposal Amortization Impairment(*1) Others(*2) Ending balance In millions of won Software ￦ 157,681 42,694 (774 ) (81,883 ) — 47,277 164,995 (Government grants) (420 ) — — 202 — (17 ) (235 ) Copyrights, patents rights and other industrial rights 67,112 171 (325 ) (9,196 ) — (4,501 ) 53,261 Mining rights 534,524 8,742 — (7,186 ) (513,519 ) 21,162 43,723 Development expenditures 92,486 687 — (28,901 ) (68 ) 29,639 93,843 (Government grants) (2,110 ) — — 833 — (215 ) (1,492 ) Intangible assets under development 70,536 56,082 — — — (66,128 ) 60,490 (Government grants) (10,564 ) — — — — (465 ) (11,029 ) Usage rights of donated assets and other 87,011 — — (15,632 ) — 121,782 193,161 (Government grants) — — — — — — — Leasehold rights 5,552 — — (741 ) — 507 5,318 Greenhouse gas emissions rights 7,050 118,743 (7,058 ) — — (77,079 ) 41,656 Others 217,084 2,307 (164 ) (14,413 ) (22 ) 221,572 426,364 (Government grants) — — — 2 — (81 ) (79 ) ￦ 1,225,942 229,426 (8,321 ) (156,915 ) (513,609 ) 293,453 1,069,976 (*1) KEPCO Australia Pty., Ltd. and KEPCO Bylong Australia Pty., Ltd., 100% owned subsidiaries, performed an impairment test over the mining rights and the Company recognized the amount of the carrying amount in excess of its recoverable amount as an impairment loss. (*2) ‘Others’ include the business rights amounting to ￦172,434 million increased from the business combination between Korea East-West Power Co., Ltd. and Eumseong Natural Gas Power Co., Ltd. 2020 Beginning Acquisition Disposal Amortization Impairment Others Ending balance 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 (3) Significant specific intangible assets as of December 31, 2019 and 2020 are as follows: 2019 Type Description Currency Amount Remaining useful lives In millions of won and thousands of Australian dollars Software ERP system and others KRW 432 1 year and 2 months ~ 1 year and 4 months Electricity sales information system KRW 4,824 3 years Copyrights, patents rights and other industrial rights Smart technology verification and standard design project conducting right KRW 6,787 2 years and 9 months Contributions to ARP NRC DC KRW 34,755 8 years Mining rights Mining rights of Bylong mine AUD — — (*) Development expenditures Electricity sales information system KRW 15,283 2 years and 3 months Usage rights of donated assets and others Sejong Haengbogdosi sharing charge KRW 31,385 6 years and 11 months Dangjin power plant load facility usage right KRW 7,870 1 year and 3 months Others Occupancy and use of public waters KRW 92,446 17 years and 1 months Business rights KRW 171,955 29 years and 11 months (*) The carrying amount of mining rights is nil, because KEPCO Australia Pty., Ltd. and KEPCO Bylong Australia Pty., Ltd. recognized impairment losses in full during the year ended December 31, 2019. 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 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. (4) For the years ended December 31, 2018, 2019 and 2020, the Company recognized research and development expenses of 723,888 million, 735,715 million and 700,642 million, respectively.

Trade and Other Payables

Trade and Other Payables	12 Months Ended
	Dec. 31, 2020
Trade and Other Payables [Abstract]
Trade and Other Payables	22. Trade and Other Payables Trade and other payables as of December 31, 2019 and 2020 are as follows: 2019 2020 Current Non-current Current Non-current In millions of won Trade payables ￦ 2,859,721 — 2,606,861 — Non-trade 1,952,659 2,446,714 1,785,068 2,324,965 Accrued expenses 1,028,869 2,033 1,197,815 2,038 Leasehold deposits received 2,571 709 2,336 943 Other deposits received 163,382 68,702 83,505 67,645 Lease liabilities 635,349 4,434,784 576,665 4,044,431 Dividends payable 6,851 — 4,271 — Others(*) — 12,818 — 40,390 ￦ 6,649,402 6,965,760 6,256,521 6,480,412 (*) Details of others as of December 31, 2019 and 2020 are as follows: 2019 2020 Current Non-current Current Non-current In millions of won Advance received from local governments ￦ — 5,818 — 4,278 Others — 7,000 — 36,112 ￦ — 12,818 — 40,390

Borrowings and Debt Securities

Borrowings and Debt Securities	12 Months Ended
	Dec. 31, 2020
Borrowings and Debt Securities [Abstract]
Borrowings and Debt Securities	23. Borrowings and Debt Securities (1) Borrowings and debt securities as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Current liabilities Short-term borrowings ￦ 1,098,555 1,436,922 Current portion of long-term borrowings 217,579 677,982 Current portion of debt securities 7,545,485 8,565,301 Less : Current portion of discount on long-term borrowings (1,000 ) (1,723 ) Less : Current portion of discount on debt securities (2,780 ) (3,677 ) 8,857,839 10,674,805 Non-current Long-term borrowings ￦ 3,411,052 3,018,898 Debt securities 55,716,183 56,188,234 Less : Discount on long-term borrowings (21,309 ) (14,899 ) Less : Discount on debt securities (88,920 ) (143,823 ) Add: Premium on debt securities 1,696 1,366 59,018,702 59,049,776 ￦ 67,876,541 69,724,581 (2) Repayment schedule of borrowings and debt securities as of December 31, 2019 and 2020 are as follows: 2019 Type Borrowings Debt Securities In millions of won Less than 1 year ￦ 1,316,134 7,545,485 1~ 5 years 2,113,404 31,552,963 Over 5 years 1,297,648 24,163,220 ￦ 4,727,186 63,261,668 2020 Type 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 (3) Short-term borrowings as of December 31, 2019 and 2020 are as follows: 2019 Type Creditor Interest rate (%) Maturity Foreign currency Local currency In millions of won and thousands of foreign currencies Local short-term DB financial investment and others 2.00~2.20 2020.01.13~ 2020.02.05 — ￦ 280,000 Foreign short-term LG-CNS 4.60 2020.06.30 USD 23,699 27,439 Foreign short-term BDO Unibank 3M BVAL + 0.50 2020.12.20 PHP 225,000 5,130 Foreign short-term Mizuho Bank 4.60 2020.06.30 USD 11,027 ￦ 12,767 Electronic short-term bonds Mirae asset daewoo and others 1.72~2.20 2020.01.10~ 2020.02.05 — 400,000 Local bank overdraft Korea development Bank and others 1.98~2.75 2020.01.01~ 2020.04.16 — 373,219 ￦ 1,098,555 2020 Type Creditor Interest rate (%) Maturity Foreign currency Local currency In millions of won and thousands of foreign currencies Local short-term DB financial investment and others 0.80~4.60 2021.01.05 ~2021.12.31 — ￦ 580,004 Electronic short-term 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 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 (*) 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, 2019 and 2020 are as follows: 2019 Type Interest rate (%) Maturity Foreign currency Local currency In millions of won and thousands of foreign currencies Local long-term borrowings Korea Development Bank Others 0.50 2020~2044 — ￦ 3,500 Facility 2.50~4.60 2023~2028 — 59,845 Operating funds 2.33~3.04 2020~2022 — 55,000 Operating funds 1yr KoFC bond 2020~2022 — 24,000 Hana Bank Commercial Paper 3M 2021~2024 — ￦ 1,150,000 Facility 4.60 2028 — 12,466 Facility 3yr KTB rate-1.25 2020~2028 — 6,699 IBK PF Refinancing CD+1.25 2030 — 10,497 Export-Import Bank of Korea Project loans 1.50 2026 — 19,150 Operating funds 2.21 2020 — 35,000 Korea Energy Agency Development of power resources 3yr KTB rate-2.25 2023~2025 — 4,350 Facility 3yr KTB rate-2.25 2020~2024 — 2,058 Project loans — 2023 — 1,197 Others KTB rate-2.25 2024~2028 — 15,696 Shinhan Bank Facility CB rate+1.10 2028 — 18,698 Others 3.95 2035 — 99,146 Others Standard overdraft 2035 — 99,146 Kookmin Bank Facility 3.16 2020 — 10,000 Facility MOR+0.79 2023 — 23,333 Others Facility 1.75~6.80 2026~2036 — 390,044 Facility CB Standard overdraft 2023~2036 — 111,834 PF Refinancing 4.10 2030 — 29,159 Others 4.50~7.90 2022~2039 — 102,348 2,283,166 Foreign long-term borrowings Korea Energy Agency Project loans — 2021~2023 USD 8,744 10,123 Export-Import Bank of Korea and others Direct loan and others 1M 2036 USD 101,912 117,994 Direct loan and others 3M 2027 JOD 146,380 239,039 PF Loan 6M 2032 USD 118,684 137,412 Others 3.88 2021 USD 289,709 334,685 SCNT and others Shareholder’s loan 6.50~8.00 2023 USD 13,000 15,051 Shareholder’s loan 8.00 2031 JOD 4,853 7,925 Samsung Life Insurance and others Syndicated Loan 3.10 2032 JPY 4,981,038 ￦ 52,972 Woori Bank and others Syndicated Loan JPY 6M 2032 JPY 3,213,121 34,171 IFC and others Others 6M Libor+5.00 2031 PKR 37,252,930 278,652 Federal Financing Bank and others PF Loan 2.39~13.00 2031~2038 USD 101,380 117,377 Others Others — — USD 57 64 1,345,465 3,628,631 Less : Discount on long-term borrowings (22,309 ) Less : Current portion of long-term borrowings (217,579 ) Add : Current portion of discount on long-term borrowings 1,000 ￦ 3,389,743 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 Loan 3.10 2032 JPY 4,682,816 49,369 Woori Bank and others Syndicated Loan 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 Loan 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 (5) Local debt securities as of December 31, 2019 and 2020 are as follows: Issue date Maturity Interest 2019 2020 In millions of won Electricity Bonds 2011.05.06~ 2020.11.04 2021.02.08~ 2049.10.24 1.02~4.58 ￦ 28,450,000 27,810,000 Corporate Bonds(*) 2009.10.16~ 2020.12.22 2021.01.11~ 2050.12.22 1.00~6.00 24,463,577 26,463,577 52,913,577 54,273,577 Less : Discount on local debt securities (42,274 ) (46,730 ) Less : Current portion of local debt securities (6,340,000 ) (7,243,217 ) Add : Current portion of discount on local debt securities 1,409 2,108 ￦ 46,532,712 46,985,738 (*) 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. (6) Foreign debt securities as of December 31, 2019 and 2020 are as follows: 2019 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 249,074 ￦ 288,379 FY-97 1997.01.31~ 1997.08.04 2027.02.01~ 2027.08.01 6.75~7.00 USD 314,717 364,379 FY-04 2004.04.23 2034.04.23 5.13 USD 286,920 332,196 FY-11 2011.07.13 2021.07.13 4.75 USD 500,000 578,900 FY-12 2012.09.19 2022.09.19 3.00 USD 750,000 868,350 FY-13 2013.09.25 2020.09.25 5.75 AUD 325,000 263,361 FY-14 2014.07.30~ 2014.12.02 2020.06.02~ 2029.07.30 2.50~3.57 USD 600,000 694,680 FY-15 2015.06.15 2025.06.15 3.25 USD 300,000 347,340 FY-16 2016.01.21 2021.07.21 2.50 USD 300,000 347,340 FY-17 2017.04.12~ 2017.07.25 2020.04.12~ 2027.07.25 2.38~3.13 USD 1,100,000 1,273,580 FY-17 2017.10.30 2037.10.30 1.70 EUR 40,000 51,897 FY-17 2017.11.16 2037.11.16 2.36 SEK 450,000 55,737 FY-18 2018.01.29~ 2018.07.25 2021.01.29~ 2023.07.25 3.00~3.88 USD 1,800,000 2,084,040 FY-18 2018.03.13 2028.03.13 3.35 HKD 1,650,000 245,289 FY-19 2019.01.22~ 2019.06.24 2022.01.22~ 2024.06.24 2.50~3.38 USD 800,000 926,240 FY-19 2019.02.27 2024.02.27 0.13 CHF 200,000 ￦ 239,104 FY-19 2019.07.19 2024.07.19~ 2027.07.19 0.00~0.05 CHF 300,000 358,656 FY-19 2019.07.22 2022.07.22 2.38 USD 300,000 347,340 FY-19 2019.10.30 2024.10.30 3M AUD 300,000 243,102 FY-19 2019.12.19 2037.12.31 3.30~5.70 USD 378,460 438,181 10,348,091 Less : Discount on foreign debt securities (49,426 ) Add : Premium on foreign debt securities 1,696 Less : Current portion of foreign debt securities (1,205,485 ) Add : Current portion of discount on foreign debt securities 1,371 ￦ 9,096,247 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 (7) Changes in borrowings and debt securities for the years ended December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Beginning balance ￦ 61,034,627 67,876,541 Cash flow 6,342,074 2,538,787 Effect of exchange rate fluctuations 494,414 (640,304 ) Increase from the business combination 2,900 — Others 2,526 (50,443 ) Ending balance ￦ 67,876,541 69,724,581

Leases

Leases	12 Months Ended
	Dec. 31, 2020
Presentation of leases for lessee [Abstract]
Disclosure of leases	24. Lease 1) 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 ￦20,127 million and ￦45,787 million respectively, as expense for the years ended December 31, 2019 and 2020. The Company also applies the leases of low-value (2) Right-of-use 2019 Acquisition cost Accumulated depreciation Book value In millions of won Land ￦ 693,103 (49,029 ) 644,074 Buildings 54,980 (20,403 ) 34,577 Structures 28,198 (2,554 ) 25,644 Machinery 1,308 (484 ) 824 Ships 4,113,754 (425,465 ) 3,688,289 Vehicles 20,817 (7,109 ) 13,708 Others(*) 2,661,850 (2,285,393 ) 376,457 ￦ 7,574,010 (2,790,437 ) 4,783,573 (*) Including power purchase agreements (“PPA”) with GS EPS and two other LNG combined power suppliers. 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. (3) Changes in right-of-use 2019 Beginning Changes in Increase Depreciation Ending balance In millions of won Land ￦ — 684,386 8,717 (49,029 ) 644,074 Buildings — 36,874 18,106 (20,403 ) 34,577 Structures — 20,840 7,358 (2,554 ) 25,644 Machinery — — 1,308 (484 ) 824 Ships — 3,986,947 126,807 (425,465 ) 3,688,289 Vehicles — 11,258 9,559 (7,109 ) 13,708 Others — 403,346 49,141 (76,030 ) 376,457 ￦ — 5,143,651 220,996 (581,074 ) 4,783,573 (*) Including transferred amount of ￦195,704 million, which was classified as finance lease assets as of December 31, 2018. 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 (4) Lease liabilities as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Less than 1 year ￦ 686,445 614,442 1 ~ 5 years 2,334,883 2,133,538 More than 5 years 2,735,681 2,461,557 5,757,009 5,209,537 Less : Discount (686,876 ) (588,441 ) Present value of lease payment ￦ 5,070,133 4,621,096 (5) The details of the liquidity classification of lease liabilities as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Current lease liabilities ￦ 635,349 576,665 Non-current 4,434,784 4,044,431 ￦ 5,070,133 4,621,096 (6) Changes in lease liabilities for the years ended December 31, 2019 and 2020 are as follows: 2019 Beginning Changes in Increase Decrease Interest Others(*) Ending In millions of won Lease liabilities ￦ 283,806 4,943,584 218,800 (659,387 ) 85,950 197,380 5,070,133 (*) Including translation effect of foreign currency lease liabilities and others. 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. (7) Details of expense relating to lease contracts as lessee for the year ended December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Depreciation of right-of-use ￦ 581,074 586,254 Interest expenses of lease liabilities 85,950 111,782 Leases expenses for short-term leases 20,127 45,787 Leases expenses for leases of low-value 1,616 2,796 Variable lease payments (15,912 ) 33,267 ￦ 672,855 779,886 (8) The total cash outflow related to the lease contracts, including cash outflows due to short-term leases and leases of low-value 665,218 million and 807,609 million, for the years ended December 31, 2019 and 2020, respectively. 2) Company as a lessor (1) Finance lease contracts The Company entered into power purchase agreements (“PPA”) with Jordan Electric Power Company to provide a 373MW level Qatrana gas combined power plant over a 25-year 20-year fly-ash (2) Profit and loss related to finance lease for the years ended December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Finance income on the net investment in the lease ￦ 97,392 117,763 (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, 2019 and 2020 are as follows: 2019 2020 In millions of won Less than 1 year ￦ 173,093 162,211 1 ~ 2 years 150,895 148,485 2 ~ 3 years 150,596 144,913 3 ~ 4 years 149,364 139,605 4 ~ 5 years 145,964 136,962 More than 5 years 1,740,652 1,583,576 2,510,564 2,315,752 Less : Unearned finance income (1,331,723 ) (1,192,686 ) Net investment in the lease(*) ￦ 1,178,841 1,123,066 (*) Including the present value of unguaranteed residual value amounting to ￦15,946 million and ￦16,407 million, as of December 31, 2019 and 2020, 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 1.39% up to 16.60% per year as of December 31, 2020. (prior year : 3.50% ~ 16.48%) (4) Changes in the allowance for doubtful accounts of finance lease receivables for the years ended December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Beginning balance ￦ 1,133 862 Bad debt expense — 128 Reversal of allowance for doubtful accounts (271 ) — Ending balance ￦ 862 990

Employment Benefits

Employment Benefits	12 Months Ended
	Dec. 31, 2020
Employment Benefits [Abstract]
Employment Benefits	25. Employment Benefits (1) Employment benefit obligations as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Net defined benefit asset ￦ 1,047 7,231 Net defined benefit obligations 1,925,134 1,907,013 Other long-term employee benefit obligations 4,720 3,847 (2) Principal assumptions on actuarial valuation as of December 31, 2019 and 2020 are as follows: 2019 2020 Discount rate 1.92%~2.05% 1.87%~2.12% Future salary and benefit levels 4.39% 4.28% Weighted average duration 10.95 years 10.77 years (3) Details of expense relating to defined benefit plans for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Current service cost ￦ 369,899 440,300 509,520 Interest cost 87,687 83,619 83,248 Expected return on plan assets (42,135 ) (41,597 ) (42,742 ) Past service cost — 301,442 (2,027 ) Loss from settlement (767 ) (2,017 ) — ￦ 414,684 781,747 547,999 Expenses described above are recognized in those items below in the consolidated financial statements. 2018 2019 2020 In millions of won Cost of sales ￦ 308,672 580,623 397,442 Selling and administrative expenses 51,903 120,455 94,846 Others (Construction-in-progress 54,109 80,669 55,711 ￦ 414,684 781,747 547,999 In addition, for the years ended December 31, 2018, 2019 and 2020, employee benefit obligations expenses of ￦66,833 million, ￦71,844 million and ￦60,587million, respectively, are recognized as cost of sales, and ￦13,204 million, ￦12,775 million and ￦9,121 million, respectively, are recognized as selling and administrative expenses, and ￦14,189 million, ￦13,893 million and ￦11,861 million, respectively, are recognized as construction-in-progress (4) Details of defined benefit obligations as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Present value of defined benefit obligation from funded plans ￦ 4,035,400 4,570,614 Fair value of plan assets (2,111,313 ) (2,670,832 ) 1,924,087 1,899,782 Present value of defined benefit obligation from unfunded plans — — Net liabilities incurred from defined benefit plans ￦ 1,924,087 1,899,782 (5) Changes in the present value of defined benefit obligations for the years ended December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Beginning balance ￦ 3,414,116 4,035,400 Current service cost 440,300 509,520 Interest cost(*) 83,619 83,248 Remeasurement component (93,736 ) 84,385 Past service cost 301,442 (2,027 ) Loss from settlement (2,018 ) — Actual payments (108,057 ) (139,956 ) Others (266 ) 44 Ending balance ￦ 4,035,400 4,570,614 (*) The Company decided to include a performance incentive for management evaluation in the average wage during the previous year and recognized it as past service cost. (6) Changes in the fair value of plan assets for the years ended December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Beginning balance ￦ 1,775,331 2,111,313 Expected return 41,597 42,742 Remeasurement component (11,186 ) (390 ) Contributions by the employers 348,386 582,275 Actual payments (42,815 ) (65,108 ) Ending balance ￦ 2,111,313 2,670,832 In addition, loss on accumulated remeasurement component amounting to ￦117,779million and ￦169,234million has been recognized as other comprehensive income or loss for the years ended December 31, 2019 and 2020, respectively. (7) Details of the fair value of plan assets as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Equity instruments ￦ 189,235 253,358 Debt instruments 648,265 822,582 Bank deposit 199,743 284,655 Others 1,074,070 1,310,237 ￦ 2,111,313 2,670,832 For the years ended December 31, 2019 and 2020, actual returns on plan assets amounted to ￦30,411 million and ￦42,352 million, respectively. (8) Remeasurement component recognized in other comprehensive income (loss) for the years ended December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Actuarial gain from changes in financial assumptions ￦ (2,916 ) (2,979 ) Experience adjustments, etc. (90,820 ) 87,364 Expected return 11,186 390 ￦ (82,550 ) 84,775 Remeasurement component recognized as other comprehensive income or loss is included in retained earnings.

Provisions

Provisions	12 Months Ended
	Dec. 31, 2020
Provisions [Abstract]
Provisions	26. Provisions (1) Provisions as of December 31, 2019 and 2020 are as follows: 2019 2020 Current Non-current Current Non-current In millions of won Employment benefits Provisions for employment benefits ￦ 975,619 — 1,024,574 — Litigation Litigation provisions 39,177 49,221 46,287 66,715 Decommissioning cost Nuclear plants — 15,994,039 — 16,974,884 Spent fuel 401,741 953,539 487,529 866,472 Radioactive waste 77,053 1,811,029 46,369 1,845,244 PCBs — 152,981 — 119,019 Other recovery provisions — 10,773 — 25,840 Others Power plant regional support program 140,133 — 144,272 — Transmission regional support program 139,785 — 96,895 — Provisions for financial guarantee 111 81,246 22,250 44,104 Provisions for RPS 2,889 — 9,126 — Provisions for greenhouse gas emissions obligations 682,459 — 393,121 — Others 145,754 13,220 181,241 133,294 ￦ 2,604,721 19,066,048 2,451,664 20,075,572 (2) Changes in provisions for the years ended December 31, 2019 and 2020 are as follows: 2019 Beginning Increase in Payment Reversal Others Ending balance In millions of won Employment benefits Provisions for employment benefits ￦ 976,347 900,033 (879,980 ) (20,781 ) — 975,619 Litigation Litigation provisions 77,793 59,366 (17,236 ) (31,525 ) — 88,398 Decommissioning cost Nuclear plants 13,388,134 2,639,562 (33,657 ) — — 15,994,039 Spent fuel 1,291,354 440,029 (376,103 ) — — 1,355,280 Radioactive waste 1,685,008 209,551 (6,787 ) — 310 1,888,082 PCBs 147,668 14,251 (8,938 ) — — 152,981 Other recovery provisions 10,477 2,020 (2,033 ) — 309 10,773 Others Power plant regional support program 137,668 41,341 (48,390 ) — 9,514 140,133 Transmission regional support program 151,698 169,616 (181,529 ) — — 139,785 Provisions for tax 6,845 — — (6,847 ) 2 — Provisions for financial guarantee 15,586 83,910 (16,589 ) (1,551 ) 1 81,357 Provisions for RPS 93,919 222,119 (313,149 ) — — 2,889 Provisions for greenhouse gas emissions obligations 136,187 724,002 (152,463 ) (25,267 ) — 682,459 Others 61,862 113,751 (16,217 ) (833 ) 411 158,974 ￦ 18,180,546 5,619,551 (2,053,071 ) (86,804 ) 10,547 21,670,769 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

Government Grants

Government Grants	12 Months Ended
	Dec. 31, 2020
Government grants [Abstract]
Government Grants	27. Government Grants (1) Government grants as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Land ￦ (21,817 ) (23,475 ) Buildings (61,920 ) (57,231 ) Structures (186,554 ) (180,009 ) Machinery (158,907 ) (157,785 ) Vehicles (2,275 ) (632 ) Equipment (241 ) (227 ) Tools (403 ) (239 ) Construction-in-progress (61,211 ) (79,126 ) Investment properties (13 ) (29 ) Software (235 ) (136 ) Development expenditures (1,492 ) (5,043 ) Intangible assets under development (11,029 ) (7,203 ) Other intangible assets (79 ) (75 ) ￦ (506,176 ) (511,210 ) (2) Changes in government grants for the years ended December 31, 2019 and 2020 are as follows: 2019 Beginning Receipt Acquisition Offset the Disposal Others Ending In millions of won Cash ￦ — (21,705 ) — — — 21,705 — Land (21,968 ) — — — 151 — (21,817 ) Buildings (63,189 ) — — 6,214 — (4,945 ) (61,920 ) Structures (190,854 ) — — 9,373 2,405 (7,478 ) (186,554 ) Machinery (173,242 ) — — 17,993 635 (4,293 ) (158,907 ) Vehicles (4,220 ) — — 2,170 5 (230 ) (2,275 ) Equipment (418 ) — — 262 — (85 ) (241 ) Tools (675 ) — — 281 — (9 ) (403 ) Construction-in-progress (54,740 ) — 12,338 — — (18,809 ) (61,211 ) Finance lease assets (26 ) — — — — 26 — Investment properties (50 ) — — 1 — 36 (13 ) Software (420 ) — — 202 — (17 ) (235 ) Development expenditures (2,110 ) — — 833 — (215 ) (1,492 ) Intangible assets under development (10,564 ) — — — — (465 ) (11,029 ) Other intangible assets — — — 2 — (81 ) (79 ) ￦ (522,476 ) (21,705 ) 12,338 37,331 3,196 (14,860 ) (506,176 ) 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 )

Deferred Revenues

Deferred Revenues	12 Months Ended
	Dec. 31, 2020
Deferred Revenues [Abstract]
Deferred Revenues	28. Deferred Revenues Deferred revenue for the years ended December 31, 2019 and 2020 are as follows which included in current and non-current non-financial 2019 2020 In millions of won Beginning balance ￦ 8,606,563 9,201,538 Increase during the period 1,199,783 1,310,128 Recognized as revenue during the period (604,808 ) (643,477 ) Ending balance ￦ 9,201,538 9,868,189

Non-financial Liabilities

Non-financial Liabilities	12 Months Ended
	Dec. 31, 2020
Other Liabilities Disclosure [Abstract]
Non-financial Liabilities	29. Non-financial Non-financial 2019 2020 Current Non-current Current Non-current In millions of won Advance received ￦ 3,825,240 192,863 3,693,043 331,596 Unearned revenue 30,988 6,589 35,068 6,122 Deferred revenue 590,928 8,610,610 625,596 9,242,593 Withholdings 160,977 10,901 257,059 9,909 Others 1,080,220 13,489 1,360,684 71,721 ￦ 5,688,353 8,834,452 5,971,450 9,661,941

Contributed Capital

Contributed Capital	12 Months Ended
	Dec. 31, 2020
Disclosure of classes of share capital [Abstract]
Contributed Capital	30. Contributed Capital (1) Details of shares issued as of December 31, 2019 and 2020 are as follows: 2019 Shares authorized Shares issued 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. 2020 Shares authorized Shares issued 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, 2019 and 2020 are as follows. 2019 2020 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, 2019 and 2020 are as follows: 2019 2020 In millions of won Share premium ￦ 843,758 843,758

Retained Earnings and Dividends

Retained Earnings and Dividends Paid	12 Months Ended
	Dec. 31, 2020
Disclosure of Retained Earnings and Dividends Paid [Abstract]
Retained Earnings and Dividends Paid	31. Retained Earnings and Dividends Paid (1) Details of retained earnings as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Legal reserve(*) ￦ 1,604,910 1,604,910 Voluntary reserves 34,785,425 32,179,066 Retained earnings before appropriations 12,811,798 17,349,625 Retained earnings ￦ 49,202,133 51,133,601 (*) The KEPCO Act requires KEPCO to appropriate a legal reserve equal to at least 20 percent of net income for each accounting period until the reserve equals 50 percent of KEPCO’s common stock. The legal reserve is not available for cash dividends; however, this reserve may be credited to paid-in (2) Details of voluntary reserves as of December 31, 2019 and 2020 are as follows: 2019 2020 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 28,967,976 26,361,617 Reserve for equalizing dividends 210,000 210,000 ￦ 34,785,425 32,179,066 (*) 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, 2019 and 2020 are as follows: 2019 2020 In millions of won Beginning balance ￦ 51,519,119 49,202,133 Profit (loss) for the period attributed to owner of the controlling Company (2,345,517 ) 1,991,347 Changes in equity method retained earnings (6,789 ) 3,181 Remeasurements of defined benefit liability, net of tax 36,160 (62,857 ) Transfer of gain (loss) on valuation of financial assets through other comprehensive income (840 ) — Transactions between consolidated entities — (203 ) Ending balance ￦ 49,202,133 51,133,601 (4) Dividends paid for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 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 ￦ 790 507,152 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 ￦ — — (5) Changes in retained earnings of investments in associates and joint ventures for the years ended December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Beginning balance ￦ 3,969 (2,820 ) Changes (6,789 ) 3,181 Ending balance ￦ (2,820 ) 361 (6) Changes in remeasurement components related to defined benefit liability for the years ended December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Beginning balance ￦ (219,381 ) (117,779 ) Changes 76,395 (77,828 ) Income tax effect (40,235 ) 14,971 Transfer to reserve for business expansion 65,442 11,402 Ending balance ￦ (117,779 ) (169,234 )

Statement of Appropriation of R

Statement of Appropriation of Retained Earnings	12 Months Ended
	Dec. 31, 2020
Statement of Appropriation of Retained Earnings [Abstract]
Statement of Appropriation of Retained Earnings	32. Statement of Appropriation of Retained Earnings (Statement of Disposition of Deficit) For the year ended December 31, 2019, KEPCO’s deficits were appropriated on March 27, 2020. For the year ended December 31, 2020, KEPCO’s retained earnings are expected to be disposed on March 25, 2021. Statements of disposition of deficit and appropriation of retained earnings of KEPCO, the controlling company, for the years ended December 31, 2019 and 2020, respectively, are as follows: 2019 2020 In millions of won except for I.   Retained earnings before appropriations (undisposed deficit) Unappropriated retained earnings carried over from prior years ￦ — — Net income (loss) (2,594,957 ) 1,951,498 Remeasurements of the defined benefit plan (11,402 ) (67,119 ) (2,606,359 ) 1,884,379 II. Transfer from voluntary reserves 2,606,359 — III.  Subtotal (I+II) — 1,884,379 IV.  Appropriations of retained earnings (Disposition of deficit) Legal reserve — — Dividends (government, individual) (Amount of dividends per share (%) : Current year – ￦1,216 (24.32%) Prior year – ￦0 (0%)) — (780,628 ) Reserve for business expansion — (1,103,751 ) — (1,884,379 ) V. Unappropriated retained earnings to be carried over forward to subsequent year — —

Hybrid Bonds

Hybrid Bonds	12 Months Ended
	Dec. 31, 2020
Hybrid Bonds [Abstract]
Hybrid Bonds	33. Hybrid Bonds Hybrid bonds classified as equity (non-controlling Issuer Hybrid bond Issued date Maturity Yield (%) 2019 2020 In millions of won Korea South-East Power Co., Ltd. 1st hybrid bond 2012.12.07 2042.12.06 4.38 ￦ 170,000 170,000 Korea South-East Power Co., Ltd. 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, the contractual agreements allow these subsidiaries to indefinitely extend the maturity dates and defer the payment of interest without modification to the other terms of the instruments. When the Company decides not to pay dividends on ordinary shares, they are not required to pay interest on the hybrid bonds. Substantially, as these instruments have no contractual obligation to pay principal and interest, these instruments have been classified as equity (non-controlling

Other Components of Equity

Other Components of Equity	12 Months Ended
	Dec. 31, 2020
Other Components of Equity [Abstract]
Other Components of Equity	34. Other Components of Equity (1) Other components of equity of the parent as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Other capital surplus ￦ 1,226,364 1,224,105 Accumulated other comprehensive income (loss) (280,730 ) (409,577 ) Other equity 13,294,973 13,294,973 ￦ 14,240,607 14,109,501 (2) Changes in other capital surplus for the years ended December 31, 2019 and 2020 are as follows: 2019 2020 Gains on treasury stocks Others Subtotal Gains on disposal of treasury stocks Others Subtotal In millions of won Beginning balance ￦ 387,524 847,301 1,234,825 387,524 838,840 1,226,364 Issuance of share capital of subsidiary — — — — (148 ) (148 ) Others — (8,461 ) (8,461 ) — (2,111 ) (2,111 ) Ending balance ￦ 387,524 838,840 1,226,364 387,524 836,581 1,224,105 (3) Changes in accumulated other comprehensive income (loss) for the years ended December 31, 2019 and 2020 are as follows: 2019 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 ￦ (81,708 ) 123,553 (350,245 ) (50,170 ) (358,570 ) Changes in the unrealized fair value of financial assets at FVOCI, net of tax (10,891 ) — — — (10,891 ) Shares in other comprehensive income of associates and joint ventures, net of tax — 19,343 — — 19,343 Foreign currency translation of foreign operations, net of tax — — 55,347 — 55,347 Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax — — — 14,041 14,041 Ending balance ￦ (92,599 ) 142,896 (294,898 ) (36,129 ) (280,730 ) 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 ) (4) Other equity as of December 31, 2019 and 2020 are as follows: 2019 2020 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, 2020
Revenue [Abstract]
Sales	35. Sales Details of sales for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 Domestic Overseas Domestic Overseas Domestic Overseas In millions of won [Type of goods and services] Sales of goods ￦ 57,514,866 382,938 56,609,330 285,546 56,380,608 303,704 Electricity 56,842,011 — 55,939,001 — 55,730,985 — Heat supply 216,117 — 220,948 — 198,715 — Others 456,738 382,938 449,381 285,546 450,908 303,704 Sales related to rendering of services 176,539 216,328 222,106 186,184 223,075 206,275 Sales of construction services 108,586 1,633,805 110,692 1,154,224 170,895 641,280 ￦ 57,799,991 2,233,071 56,942,128 1,625,954 56,774,578 1,151,259 [Timing of revenue recognition] Performance obligations satisfied at a point in time ￦ 57,514,866 382,938 56,609,330 285,546 56,380,608 303,704 Performance obligations satisfied over time 285,125 1,850,133 332,798 1,340,408 393,970 847,555 ￦ 57,799,991 2,233,071 56,942,128 1,625,954 56,774,578 1,151,259

Selling and Administrative Expe

Selling and Administrative Expenses	12 Months Ended
	Dec. 31, 2020
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, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Salaries ￦ 757,819 775,204 1,095,183 Retirement benefit expense 65,107 157,272 103,967 Welfare and benefit expense 132,089 120,463 155,071 Insurance expense 12,181 12,427 10,178 Depreciation 214,499 232,510 218,103 Amortization of intangible assets 54,153 76,547 87,086 Bad debt expense 39,784 (12,719 ) 20,648 Commission 714,096 632,849 368,275 Advertising expense 30,894 34,453 29,559 Training expense 6,277 7,174 5,196 Vehicle maintenance expense 10,148 9,525 9,435 Publishing expense 3,307 3,414 3,677 Business promotion expense 2,785 3,038 3,614 Rent expense 42,851 40,505 36,337 Telecommunication expense 23,505 8,451 8,686 Transportation expense 686 865 1,007 Taxes and dues 46,424 58,666 62,828 Expendable supplies expense 6,166 6,682 8,029 Water, light and heating expense 12,629 11,867 11,749 Repairs and maintenance expense 62,580 88,576 79,185 Ordinary development expense 215,494 224,463 197,436 Travel expense 14,363 15,652 10,793 Clothing expense 10,108 9,369 14,834 Survey and analysis expense 705 848 826 Membership fee 1,043 969 1,274 Others 148,197 150,506 135,467 ￦ 2,627,890 2,669,576 2,678,443 (2) Details of “others” included in selling and administrative expenses for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Accommodation development expenses ￦ 52,822 53,945 30,889 Miscellaneous wages 32,447 39,794 45,887 Litigation and filing expenses 12,853 21,768 19,341 Compensation for damages 19,193 (1,924 ) 8,374 Outsourcing expenses 3,036 3,293 3,610 Reward expenses 2,713 2,858 3,228 Overseas market development expenses 1,361 1,997 1,218 Others 23,772 28,775 22,920 ￦ 148,197 150,506 135,467

Other Income and Expense

Other Income and Expense	12 Months Ended
	Dec. 31, 2020
Disclosure of other operating income (expense) [Abstract]
Other Income and Expense	37. Other Income and Expenses (1) Other income for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Reversal of other provisions ￦ 12,700 16,542 25,826 Reversal of other allowance for doubtful accounts 143 — 2,465 Gains on government grants 482 281 269 Gains on assets contributed 17,336 6,921 24,324 Gains on liabilities exempted 10,303 916 1,314 Compensation and reparations revenue 89,901 113,292 95,407 Revenue from research contracts 6,818 5,276 4,001 Income related to transfer of assets from customers 594,548 604,808 643,477 Rental income 186,631 191,088 193,567 Others 51,032 58,849 45,798 ￦ 969,894 997,973 1,036,448 (2) Details of “others” included in other income for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Refund of claim for rectification ￦ 8,933 1,969 11,880 Adjustment of research project 2,267 3,294 2,150 Maintenance expenses on lease building 176 153 2,785 Training expenses 3,220 3,167 3,852 Deposit redemption 7 436 314 Reversal of expenses on litigation 753 9,926 620 Revenue on royalty fee 6,909 — — Reimbursement of insurance fee 7,145 610 22 Gains on guarantee contracts 39 135 134 Others 21,583 39,159 24,041 ￦ 51,032 58,849 45,798 (3) Other expenses for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Compensation and indemnification expense ￦ 23,437 403 11,959 Accretion expenses of other provisions 41,924 7,939 17,991 Depreciation expenses on investment properties 923 5,069 1,453 Depreciation expenses on idle assets 6,547 6,542 6,604 Other bad debt expense 17,827 29,348 32,503 Donations 63,743 64,752 316,981 Others 76,929 127,860 30,229 ￦ 231,330 241,913 417,720 (4) Details of “others” included in other expenses for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Operating expenses related to the idle assets ￦ 47 49 46 Research grants 461 399 91 Supporting expenses on farming and fishing village 13,537 13,991 16,115 Operating expenses on fitness center 4,788 5,234 5,101 Expenses on adjustment of research and development grants 404 554 720 Taxes and dues 199 188 253 Expenses on R&D supporting 53 67 242 Others 57,440 107,378 7,661 ￦ 76,929 127,860 30,229

Other Gains (Losses)

Other Gains (Losses)	12 Months Ended
	Dec. 31, 2020
Other Gains (Losses) [Abstract]
Other Gains (Losses)	38. Other Gains (Losses) (1) Composition of other gains (losses) for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Other gains Gains on disposal of property, plant and equipment ￦ 98,077 43,784 93,195 Gains on disposal of intangible assets 12 206 1,556 Reversal of impairment loss on property, plant and equipment — 16,692 7,805 Reversal of impairment loss on intangible assets 17 — — Gains on foreign currency translation 14,905 16,340 8,917 Gains on foreign currency transaction 47,297 53,152 61,865 Gains on insurance proceeds — 17,410 43,800 Others 221,556 238,688 322,379 Other losses Losses on disposal of property, plant and equipment (60,704 ) (72,508 ) (162,725 ) Losses on disposal of intangible assets (43 ) (827 ) (392 ) Losses on valuation of other non-current — — (241 ) Impairment loss on property, plant and equipment (710,162 ) (50,034 ) (80,413 ) Impairment loss on intangible assets (8,112 ) (513,609 ) (3,599 ) Impairment loss on other non-current (87,024 ) (49,620 ) — Losses on foreign currency translation (7,678 ) (8,757 ) (17,664 ) Losses on foreign currency transaction (65,366 ) (55,283 ) (49,694 ) Others (63,899 ) (217,892 ) (189,695 ) ￦ (621,124 ) (582,258 ) 35,094 (2) Details of “others” included in other gains for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Gains on disposal of inventories ￦ 6,350 3,424 3,373 Gains on proxy collection of TV license fee 40,450 41,013 41,438 Gains on compensation of impaired electric poles 1,166 1,372 978 Gains on compensation for infringement on contract 3,648 — — Gains on harbor facilities dues 3,803 3,741 2,231 Gains on technical fees 2,026 3,044 4,826 Reversal of occupation development training fees 1,602 1,472 352 Gains on disposal of waste 4,232 5,317 6,927 Gains on insurance 22,382 812 — Gains on tax rebate 542 341 772 Gains on other commission 4,347 1,111 1,643 Gains on disposal of assets held-for-sale — 23,778 — Others 131,008 153,263 259,839 ￦ 221,556 238,688 322,379 (3) Details of “others” included in other losses for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Losses on valuation of inventories ￦ 1,953 3,127 4,998 Losses on disposal of inventories 3,555 10,456 37,644 Losses due to disaster 2,129 7,635 16,814 Losses on rounding adjustment of electric charge surtax 1,265 1,268 1,276 Others 54,997 195,406 128,963 ￦ 63,899 217,892 189,695

Finance Income

Finance Income	12 Months Ended
	Dec. 31, 2020
Finance income [Abstract]
Finance Income	39. Finance Income (1) Finance income for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Interest income ￦ 223,767 268,118 242,586 Dividends income 12,777 13,838 7,316 Gains on disposal of financial assets 1,838 3,866 11,992 Gains on valuation of financial assets at fair value through profit or loss 8,495 5,575 12,904 Gains on valuation of derivatives 199,943 362,735 57,563 Gains on transaction of derivatives 179,745 157,961 146,448 Gains on foreign currency translation 143,254 175,839 1,005,961 Gains on foreign currency transactions 27,051 21,774 24,009 Other financial assets — — 1,470 ￦ 796,870 1,009,706 1,510,249 (2) Details of interest income included in finance income for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Cash and cash equivalents ￦ 40,704 42,861 9,419 Financial assets at fair value through profit or loss 21,713 29,411 19,114 Financial assets at amortized cost 89 539 612 Loans 21,925 63,448 26,232 Short-term financial instrument 41,025 49,070 25,540 Long-term financial instrument 7,920 12,794 10,406 Other financial assets 1 54 228 Trade and other receivables 90,390 69,941 151,035 ￦ 223,767 268,118 242,586

Finance Expenses

Finance Expenses	12 Months Ended
	Dec. 31, 2020
Finance Expenses [Abstract]
Finance Expenses	40. Finance Expenses (1) Finance expenses for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Interest expense ￦ 1,868,458 2,046,811 1,995,425 Losses on sale of financial assets 1 2,106 648 Losses on valuation of financial assets at fair value through profit or loss 6,616 4,513 7,396 Losses on valuation of derivatives 46,740 45,385 513,278 Losses on transaction of derivatives 32,448 71,546 81,055 Losses on foreign currency translation 393,859 553,731 215,047 Losses on foreign currency transaction 121,763 55,509 79,103 Losses on repayment of financial liabilities — — 35 Other 858 2,555 4,456 ￦ 2,470,743 2,782,156 2,896,443 (2) Details of interest expense included in finance expenses for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Trade and other payables ￦ 42,830 94,019 88,757 Short-term borrowings 32,545 42,971 29,358 Long-term borrowings 92,243 119,806 118,678 Debt securities 1,771,544 1,827,511 1,805,253 Other financial liabilities 505,112 558,464 540,867 2,444,274 2,642,771 2,582,913 Less: Capitalized borrowing costs (575,816 ) (595,960 ) (587,488 ) ￦ 1,868,458 2,046,811 1,995,425 Capitalization rates for the years ended December 31, 2018, 2019 and 2020 are 2.17%~3.86%, 2.37%~3.44% and 2.14%~4.84%, respectively.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2020
Income tax expense (benefit) [Abstract]
Income Taxes	41. Income Taxes (1) Income tax expense (benefit) for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Current income tax expense Payment of income tax ￦ 378,715 538,223 671,179 Adjustment in respect of prior years due to change in estimate (195,648 ) (176,441 ) (63,756 ) Current income tax directly recognized in equity 101,528 (53,302 ) 51,486 Effect of change in accounting policy 1,780 — — 286,375 308,480 658,909 Deferred tax expense (benefit) Generation and realization of temporary differences ￦ (495,658 ) (636,984 ) (77,985 ) Changes of unrecognized tax losses, tax credit and temporary differences for prior periods (28,509 ) (22,469 ) (10,471 ) Changes in deferred tax on tax losses carryforwards (572,305 ) (582,011 ) 296,070 Tax credit carryforwards (16,224 ) (71,306 ) 32,541 Amount due to change in tax rate or regulations — 1,987 — (1,112,696 ) (1,310,783 ) 240,155 Income tax expense (benefit) ￦ (826,321 ) (1,002,303 ) 899,064 (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, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Profit (loss) before income tax ￦ (2,000,819 ) (3,265,838 ) 2,991,533 Income tax expense (benefit) computed at applicable tax rate(*1) (550,225 ) (898,105 ) 822,672 Adjustments Effect of applying gradual tax rate (1,408 ) 10,362 (10,362 ) Effect of non-taxable (1,705 ) (9,990 ) (13,593 ) Effect of non-deductible 40,151 12,197 46,776 Effect of tax losses that are not recognized as deferred tax asset 2,086 57,490 — Effects of tax credits and deduction (39,471 ) (76,983 ) (63,753 ) Recognition (reversal) of unrecognized deferred tax asset, net (28,509 ) (22,469 ) (10,471 ) Effect of change in deferred tax due to change in tax rate 261 16,848 (17,590 ) Deduction of deferred tax assets — — 55,682 Deferred tax related to investments in subsidiaries, associates and joint ventures (52,618 ) 147,598 102,137 Others, net 765 (62,810 ) 51,322 (80,448 ) 72,243 140,148 Adjustment in respect of prior years due to change in estimate (195,648 ) (176,440 ) (63,756 ) Income tax expense (benefit) ￦ (826,321 ) (1,002,302 ) 899,064 Effective tax rate ( *2) ( *2) 30.05 % (*1) Applicable tax rate is 27.5% as of December 31, 2018, 2019 and 2020. (*2) The effective tax rate for the year ended December 31, 2018 and 2019 is not calculated due to income tax benefit. (3) Income tax directly adjusted to equity (except for accumulated other comprehensive income (loss)) for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Dividends of hybrid bond ￦ 4,273 3,432 4,273 (4) Income tax recognized as other comprehensive income (loss) for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 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 ￦ 35,798 (4,217 ) 19,447 Net change in the unrealized fair value of derivatives using cash flow hedge accounting 6,639 (15,642 ) (47,231 ) Remeasurement of defined benefit liability 53,703 (40,235 ) 14,972 Investments in associates 6,592 4,275 35,714 Others (5,477 ) (914 ) 24,311 ￦ 97,255 (56,733 ) 47,213 (5) Changes in deferred tax assets (liabilities) recognized in the consolidated statements of financial position for the years ended December 31, 2019 and 2020 are as follow: 2019 Beginning balance Amounts recognized in profit or loss Amount recognized in other comprehensive income (loss) Amounts recognized directly in equity Others (*) Ending balance In millions of won Deferred tax on temporary differences Employee benefits ￦ 594,541 94,541 (40,235 ) — — 648,847 Cash flow hedge 39,461 (23,977 ) (15,642 ) (841 ) — (999 ) Investments in associates and subsidiaries (8,666,871 ) (3,131 ) 4,275 — — (8,665,727 ) Property, plant and equipment (6,522,778 ) (592,440 ) — — — (7,115,218 ) Finance lease ￦ (453,074 ) 292,631 — — — (160,443 ) Intangible assets 6,055 (20,232 ) — — (41,729 ) (55,906 ) Financial assets at fair value through profit or loss 19 322 — — — 341 Financial assets at fair value through other comprehensive income 25,576 (3,114 ) (4,217 ) — — 18,245 Deferred revenue 219,742 (6,739 ) — — — 213,003 Provisions 4,800,946 655,973 — — — 5,456,919 Doubtful receivables 59 — — — — 59 Other financial liabilities 39,493 (4,402 ) — 4,273 — 39,364 Gains or losses on foreign exchange translation 27,080 30,881 — — — 57,961 Allowance for doubtful accounts 58,756 (1,149 ) — — — 57,607 Accrued income (2,914 ) (1,462 ) — — — (4,376 ) Special deduction for property, plant and equipment (211,746 ) (3,627 ) — — — (215,373 ) Others 1,053,146 290,484 (914 ) — — 1,342,716 (8,992,509 ) 704,559 (56,733 ) 3,432 (41,729 ) (8,382,980 ) Deferred tax on unused tax losses and tax credit Unused tax losses 554,457 557,356 — — — 1,111,813 Excess of donation limit 17,848 18,847 — — — 36,695 Tax credit 36,656 70,870 — — — 107,526 608,961 647,073 — — — 1,256,034 ￦ (8,383,548 ) 1,351,632 (56,733 ) 3,432 (41,729 ) (7,126,946 ) (*) ‘Others’ include amount changed due to business combination. (see Note 51) 2020 Beginning balance Amounts or loss 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 associates and subsidiaries (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 financial 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 ) (6) Deferred tax assets (liabilities) recognized in the consolidated statements of financial position as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Deferred tax assets ￦ 1,437,829 1,733,146 Deferred tax liabilities (8,564,775 ) (9,100,247 ) ￦ (7,126,946 ) (7,367,101 ) (7) Details of deductible temporary differences, tax losses and unused tax credits for which no deferred tax assets were recognized as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Deductible temporary differences ￦ 541,449 1,405,621

Assets Held-for-Sale

Assets Held-for-Sale	12 Months Ended
	Dec. 31, 2020
Assets Held-for-Sale [Abstract]
Assets Held-for-Sale	42. Assets Held-for-Sale Assets held-for-sale 2019 2020 In millions of won Land ￦ 23,002 — Buildings 193 1 Investments 4,921 — Others(*) — 924 ￦ 28,116 925 (*) As DG Fairhaven Power, LLC were sold after the end of the reporting period, the assets of DG Fairhaven Power, LLC were classified as assets held-for-sale.

Expenses Classified by Nature

Expenses Classified by Nature	12 Months Ended
	Dec. 31, 2020
Expenses Classified by Nature [Abstract]
Expenses Classified by Nature	43. Expenses Classified by Nature Expenses classified by nature for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 Selling and Cost of sales Total In millions of won Raw materials used ￦ — 19,537,928 19,537,928 Salaries 757,819 3,478,804 4,236,623 Retirement benefit expense 65,107 375,505 440,612 Welfare and benefit expense 132,089 464,483 596,572 Insurance expense 12,181 93,876 106,057 Depreciation 214,499 9,683,887 9,898,386 Amortization of intangible assets 54,153 64,785 118,938 Bad debt expense 39,784 — 39,784 Commission 714,096 475,188 1,189,284 Advertising expense 30,894 9,419 40,313 Training expense 6,277 14,096 20,373 Vehicle maintenance expense 10,148 7,809 17,957 Publishing expense 3,307 3,530 6,837 Business promotion expense 2,785 3,860 6,645 Rent expense 42,851 171,132 213,983 Telecommunication expense 23,505 82,568 106,073 Transportation expense 686 4,537 5,223 Taxes and dues 46,424 440,317 486,741 Expendable supplies expense 6,166 31,844 38,010 Water, light and heating expense 12,629 34,640 47,269 Repairs and maintenance expense 62,580 2,156,668 2,219,248 Ordinary development expense 215,494 508,394 723,888 Travel expense 14,363 67,064 81,427 Clothing expense 10,108 4,368 14,476 Survey and analysis expense 705 3,929 4,634 Membership fee 1,043 11,563 12,606 Power purchase — 18,307,289 18,307,289 Others 148,197 2,170,238 2,318,435 ￦ 2,627,890 58,207,721 60,835,611 2019 Selling and Cost of sales 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 administrative expenses Cost of sales 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

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2020
Earnings per share [Abstract]
Earnings per share	44. Earnings (Loss) Per Share (1) Basic earnings (loss) per share for the years ended December 31, 2018, 2019 and 2020 are as follows: Type 2018 2019 2020 In won Basic earnings (loss) per share ￦ (2,048 ) (3,654 ) 3,102 (2) Diluted earnings (loss) per share for the years ended December 31, 2018, 2019 and 2020 are as follows: Type 2018 2019 2020 In won Diluted earnings (loss) per share ￦ (2,048 ) (3,654 ) 3,102 (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, 2018, 2019 and 2020 are as follows: Type 2018 2019 2020 In millions of won except number of shares Profit (loss) attributable to owners of the controlling company ￦ (1,314,567 ) (2,345,517 ) 1,991,347 Profit (loss) used in the calculation of total basic earnings (loss) per share (1,314,567 ) (2,345,517 ) 1,991,347 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. Earnings (loss) used in the calculation of total diluted earnings (loss) per share for the years ended December 31, 2018, 2019 and 2020 are as follows: Type 2018 2019 2020 In millions of won Profit (loss) used in the calculation of total diluted earnings (loss) per share ￦ (1,314,567 ) (2,345,517 ) 1,991,347 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, 2018, 2019 and 2020 are as follows: Type 2018 2019 2020 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, 2018, 2019 and 2020.

Risk Management

Risk Management	12 Months Ended
	Dec. 31, 2020
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, 2019 and 2020 are as follows: 2019 2020 In millions of won Total borrowings and debt securities ￦ 67,876,541 69,724,581 Cash and cash equivalents 1,810,129 2,029,584 Net borrowings and debt securities 66,066,412 67,694,997 Total equity 68,889,649 70,666,846 Debt to equity ratio 95.90 % 95.79 % (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, 2019 and 2020 are as follows: 2019 2020 In millions of won Cash and cash equivalents ￦ 1,810,129 2,029,584 Financial assets at fair value through profit or loss(*1) 747,261 1,808,404 Derivative assets (trading) 165,204 110,764 Financial assets at amortized cost 13,609 14,422 Loans 738,707 790,162 Long-term/short-term financial instruments 1,960,227 2,062,103 Derivative assets (applying hedge accounting) 145,829 55,649 Trade and other receivables 9,703,749 9,780,039 Financial guarantee contracts(*2) 3,338,566 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. As of the reporting date, there are no financial assets and non-financial (ii) Market risk Market risk is the risk that the Company’s fair values of the financial instruments or future cash flows are affected by the changes in the market. Market risk consists of interest rate risk, currency risk and other price risk. (iii) Sensitivity analysis Significant assets and liabilities with uncertainties in underlying assumptions ① Defined benefit obligation A sensitivity analysis of defined benefit obligation assuming a 1% increase and decrease movements in the actuarial valuation assumptions as of December 31, 2019 and 2020 are as follows: 2019 2020 Type Accounts 1% Increase 1% Decrease 1% Increase 1% Decrease In millions of won Future salary increases Increase (decrease) in defined benefit obligation ￦ 442,748 (386,147 ) 488,087 (425,708 ) Discount rate Increase (decrease) in defined benefit obligation (402,099 ) 475,765 (443,527 ) 524,856 Changes of employee benefits assuming a 1% increase and decrease movements in discount rate on plan asset for the years ended December 31, 2019 and 2020 are ￦17,734 million and ￦20,960 million, respectively. ② Provisions Changes in provisions due to movements in underlying assumptions as of December 31, 2019 and 2020 are as follows: Type Accounts 2019 2020 PCBs Inflation rate 1.09 % 1.06 % Discount rate 1.97 % 1.83 % Nuclear plants Inflation rate 1.10 % 1.07 % Discount rate 2.43 % 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, 2019 and 2020 are as follows: 2019 2020 Type Accounts 0.1% Increase 0.1% Decrease 0.1% Increase 0.1% Decrease In millions of won Discount rate PCBs ￦ (527 ) 530 (292 ) 293 Nuclear plants (316,184 ) 325,828 (326,926 ) 336,928 Spent fuel (51,607 ) 53,621 (51,558 ) 53,571 Inflation rate PCBs 534 (532 ) 295 (294 ) Nuclear plants 346,082 (336,182 ) 357,676 (347,450 ) Spent fuel 54,396 (52,424 ) 54,345 (52,375 ) 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, 2019 and 2020 are as follows: Assets Liabilities Type 2019 2020 2019 2020 In thousands of foreign currencies AED 57,403 39,678 40,061 31,594 AUD 143 133 1,036,785 707,538 BDT 85,547 93,442 635 — BWP 1,437 890 — — EGP — — — 948 CAD 86 247 3,112 1,840 CHF — — 500,753 500,406 CNY — — 26,140 — CZK — — 243 2,033 EUR 208 310 111,199 121,069 GBP — — 191 43 HKD — — 1,648,815 1,651,839 IDR 376,136 342,496 219,801 555,241 INR 1,244,170 1,231,895 210,232 155,134 JOD 1,516 1,673 147 — JPY 109,970 825,269 314,402 484,585 KZT 319 1,510 — — MGA 3,858,201 5,645,349 133,403 — MMK 29,651 11,032 — — PHP 175,210 191,122 130,073 104,161 PKR 354,361 371,328 4,366 12,222 SAR 2,653 2,178 480 — SEK — — 449,072 449,824 USD 1,227,054 1,445,522 9,963,928 12,234,563 UYU 58,781 78,265 8,213 1,585 VND 418,998 672,563 1,375 — ZAR 450 303 6 — 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, 2019 and 2020 are as follows: 2019 2020 Type 10% Increase 10% Decrease 10% Increase 10% Decrease In millions of won Increase (decrease) of profit before income tax ￦ (1,197,530 ) 1,197,530 (1,336,821 ) 1,336,821 Increase (decrease) of equity(*) (1,197,530 ) 1,197,530 (1,336,821 ) 1,336,821 (*) 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, 2019 and 2020. 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, 2020, 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, 2019 and 2020 are as follows: Type 2019 2020 In millions of won Short-term borrowings ￦ — 171,518 Long-term borrowings 2,273,579 2,191,322 Debt securities 243,102 250,968 ￦ 2,516,681 2,613,808 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, 2019 and 2020 are as follows: 2019 2020 Type 1% Increase 1% Decrease 1% Increase 1% Decrease In millions of won Increase (decrease) of profit before income tax ￦ (25,167 ) 25,167 (26,138 ) 26,138 Increase (decrease) of shareholder’s equity (*) (25,167 ) 25,167 (26,138 ) 26,138 (*) 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 Ministry of Trade, Industry and Energy (“MOTIE”) under Electric Utility Act 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, 2019 and 2020 is as follows: 2019 2020 Type 1% Increase 1% Decrease 1% Increase 1% Decrease In millions of won Increase (decrease) of profit before income tax ￦ 559,390 (559,390 ) 557,310 (557,310 ) Increase (decrease) of shareholder’s equity(*) 559,390 (559,390 ) 557,310 (557,310 ) (*) 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. 2019 Type Less than 1 year 1~2 Years 2~5 Years More than 5 years Total In millions of won Borrowings and debt securities ￦ 10,660,737 10,997,510 27,881,873 30,859,669 80,399,789 Finance lease liabilities 686,445 617,449 1,717,434 2,735,681 5,757,009 Trade and other payables 6,014,054 382,809 971,469 1,176,697 8,545,029 Financial guarantee contracts(*) 937,091 302,186 32,314 2,066,975 3,338,566 ￦ 18,298,327 12,299,954 30,603,090 36,839,022 98,040,393 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 (*) This represents the total guarantee amounts associated with the financial guarantee contracts. Financial guarantee liabilities which are recognized as of December 31, 2019 and 2020 are ￦81,357 million and ￦66,354 million, respectively. The following table shows the details of maturities of non-derivative non-derivative The expected maturities for non-derivative 2019 Type Less than 1 year 1~5 Years More than 5 years Other (*) Total In millions of won Cash and cash equivalents ￦ 1,810,129 — — — 1,810,129 Financial assets at fair value through other comprehensive income — — — 379,170 379,170 Financial assets at amortized cost 12,302 1,307 — — 13,609 Loans 64,081 346,583 336,502 27,606 774,772 Long-term/short-term financial instruments 1,351,971 269,863 — 338,393 1,960,227 Financial assets at fair value through profit or loss 131,385 79 — 615,797 747,261 Trade and other receivables 7,703,746 980,951 818,431 207,979 9,711,107 ￦ 11,073,614 1,598,783 1,154,933 1,568,945 15,396,275 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 (*) 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, 2019 and 2020 are as follows: 2019 Type Less than 1 year 1~2 Years 2~5 Years More than 5 years Total In millions of won Net settlement —Trading ￦ (3,017 ) — — — (3,017 ) Gross settlement —Trading (15,011 ) (8,295 ) (39,654 ) 4,235 (58,725 ) —Hedging (59,846 ) (21,466 ) (1,914 ) (33,588 ) (116,814 ) ￦ (77,874 ) (29,761 ) (41,568 ) (29,353 ) (178,556 ) 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 ) Derivative assets classified by maturity periods which from reporting date to maturity dates as per the contracts as of December 31, 2019 and 2020 are as follows: 2019 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 21 43,931 72,386 56,315 172,653 —Hedging 27,597 47,222 71,010 — 145,829 —Others — — — 2,634 2,634 ￦ 27,618 91,153 143,396 58,949 321,116 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 (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 a financial instruments with similar contractual cash flows based on the effective interest method. (i) Fair value and book value of financial assets and liabilities as of December 31, 2019 and 2020 are as follows: 2019 2020 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 ￦ 379,170 379,170 358,559 358,559 Derivative assets (trading) 165,204 165,204 110,764 110,764 Derivative assets (applying hedge accounting) 145,829 145,829 55,649 55,649 Financial assets at fair value through profit or loss 747,261 747,261 1,881,382 1,881,382 ￦ 1,437,464 1,437,464 2,406,354 2,406,354 Assets carried at amortized cost Financial assets at amortized cost ￦ 13,609 13,609 14,422 14,422 Loans and receivables 738,707 738,707 790,162 790,162 Long-term financial instruments 608,256 608,256 578,621 578,621 Short-term financial instruments 1,351,971 1,351,971 1,483,482 1,483,482 Trade and other receivables 9,703,749 9,703,749 9,780,039 9,780,039 Cash and cash equivalents 1,810,129 1,810,129 2,029,584 2,029,584 ￦ 14,226,421 14,226,421 14,676,310 14,676,310 Liabilities recognized at fair value Derivative liabilities (trading) ￦ 53,147 53,147 157,926 157,926 Derivative liabilities (applying hedge accounting) 116,813 116,813 207,193 207,193 ￦ 169,960 169,960 365,119 365,119 Liabilities carried at amortized cost Secured borrowings ￦ 227,135 227,135 63,614 63,614 Unsecured bond 63,171,664 66,917,421 64,607,401 68,839,316 Lease liabilities 5,070,133 5,070,133 4,621,096 4,621,096 Unsecured borrowings 4,104,523 4,113,955 4,808,206 5,513,242 Trade and other payables (*) 8,545,029 8,545,029 8,115,837 8,115,837 Bank overdraft 373,219 373,219 245,360 245,360 ￦ 81,491,703 85,246,892 82,461,514 87,398,465 (*) 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 rate used for calculating fair value as of December 31, 2019 and 2020 are as follows: Type 2019 2020 Derivatives 0.01% ~ 4.16% (-) 0.73% ~ 3.08% Borrowings and debt securities 0.17% ~ 3.90% (-) 0.53% ~ 4.38% Finance lease 1.38% ~ 10.83% 0.57% ~ 16.60% (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, 2019 and 2020 are as follows: 2019 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 ￦ 201,202 — 177,968 379,170 Derivative assets — 308,399 2,634 311,033 Financial assets at fair value through profit or loss — 742,105 5,156 747,261 ￦ 201,202 1,050,504 185,758 1,437,464 Financial liabilities at fair value Derivative liabilities ￦ — 169,960 — 169,960 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 The fair value of financial assets (FVTPL and FVOCI) publicly traded is measured at the closing bid price quoted at the end of the reporting period. Meanwhile, the fair value of unquoted financial assets (FVTPL and FVOCI) is calculated using the valuation results from an external pricing service in which weighted average borrowing rates of interest of evaluated companies are used as a discount rate. The fair value of derivatives is measured using valuation model which is determined at the present value of estimated future cash flows discounted at current market interest rate. Changes of financial assets and liabilities which are classified as level 3 for the years ended December 31, 2019 and 2020 are as follows: 2019 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 ￦ 5,052 40 — 64 — — 5,156 Financial assets at fair value through other comprehensive income Unlisted securities 189,439 1,876 — 3,715 (19,315 ) 2,253 177,968 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

Service Concession Arrangements

Service Concession Arrangements	12 Months Ended
	Dec. 31, 2020
Service Concession Arrangements [Abstract]
Service Concession Arrangements	46. Service Concession Arrangements (1) Gas Complex (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, 2020 are as follows: Type Amounts In millions of won Less than 1 year ￦ 113,646 1~ 2 years 47,353 ￦ 160,999 (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, 2020 are as follows: Type Amounts In millions of won Less than 1 year ￦ 27,113 1~ 2 years 27,144 2~ 3 years 27,175 Over 3 years 525,350 ￦ 606,782

Related Parties

Related Parties	12 Months Ended
	Dec. 31, 2020
Related Parties [Abstract]
Related Parties	47. Related Parties (1) Related parties of the Company as of December 31, 2020 are as follows: Type Related party Parent Republic of Korea government Subsidiaries (126 subsidiaries) Korea Hydro & Nuclear Power Co., Ltd., Korea South-East Power Co., Ltd., Korea Midland Power Co., Ltd., Korea Western Power Co., Ltd., Korea Southern Power Co., Ltd., Korea East-West Power Co., Ltd., KEPCO Engineering & Construction Company, Inc., KEPCO Plant Service & Engineering Co., Ltd., KEPCO Nuclear Fuel Co., Ltd., KEPCO KDN Co., Ltd., Gyeonggi Green Energy Co., Ltd., Korea Offshore Wind Power Co., Ltd., KOSEP Material Co., Ltd., KEPCO International HongKong Ltd., KEPCO International Philippines Inc., KEPCO Philippines Corporation, KEPCO Ilijan Corporation, KEPCO Gansu International Ltd., KEPCO Philippines Holdings Inc., KEPCO Lebanon SARL, KEPCO Neimenggu International Ltd., KEPCO Australia Pty., Ltd., KEPCO Shanxi International Ltd., KOMIPO Global Pte Ltd., KOSEP Australia Pty., Ltd., KOMIPO Australia Pty., Ltd., KOWEPO Australia Pty., Ltd., KOSPO Australia Pty., Ltd., KEPCO Netherlands B.V., KOREA Imouraren Uranium Investment Corp., KEPCO Middle East Holding Company, Qatrana Electric Power Company, KOWEPO International Corporation, KOSPO Jordan LLC, Korea Waterbury Uranium Limited Partnership, PT. Cirebon Power Service, EWP America Inc., KHNP Canada Energy, Ltd., KEPCO Bylong Australia Pty., Ltd., KNF Canada Energy Limited, KEPCO Holdings de Mexico, KST Electric Power Company, S.A.P.I. de C.V., KEPCO Energy Service Company, KEPCO Netherlands S3 B.V., PT. KOMIPO Pembangkitan Jawa Bali, EWP Barbados 1 SRL, PT. Tanggamus Electric Power, KOMIPO America Inc., KOSEP USA, Inc., PT. EWP Indonesia, KEPCO Netherlands J3 B.V., Global One Pioneer B.V., Global Energy Pioneer B.V., Mira Power Limited, KEPCO KPS Philippines Corp., KOSPO Chile SpA, PT. KOWEPO Sumsel Operation And Maintenance Services, Commerce and Industry Energy Co., Ltd., Gyeongju Wind Power Co., Ltd., California Power Holdings, LLC, DG Fairhaven Power, LLC, EWP Renewable Corporation, EWPRC Biomass Holdings, LLC, Hee mang sunlight Power Co., Ltd., Fujeij Wind Power Company, KOSPO Youngnam Power Co., Ltd., VI Carbon Professional Private Special Asset Investment Trust 1, Chitose Solar Power Plant LLC., KEPCO Solar Co., Ltd. (formerly, Solar School Plant Co., Ltd.), KEPCO Energy Solution Co., Ltd., KOSPO Power Services Ltda., KOEN Bylong Pty., Ltd., KOWEPO Bylong Pty., Ltd., KOSPO Bylong Pty., Ltd., EWP Bylong Pty., Ltd., KOWEPO Lao International, KOMIPO Bylong Pty., Ltd., Energy New Industry Specialized Investment Private Investment Trust., KEPCO US Inc., KEPCO Alamosa LLC, KEPCO Solar of Alamosa, LLC, KEPCO Mangilao Holdings LLC(formerly, KEPCO-LG KEPCO-LG e-New e-New E-New E-New Associates (78 associates) Dongducheon Dream Power Co., Ltd., Korea Gas Corporation, Daegu Photovoltaic Co., Ltd., Haeng Bok Do Si Photovoltaic Power Co., Ltd., Korea Electric Power Industrial Development Co., Ltd., Goseong Green Power Co., Ltd., Gangneung Eco Power Co., Ltd., Shin Pyeongtaek Power Co., Ltd., Noeul Green Energy Co., Ltd., YTN Co., Ltd., Samcheok Eco Materials Co., Ltd., Gangwon Wind Power Co., Ltd., Gwangyang Green Energy Co., Ltd., Hyundai Green Power Co., Ltd., Korea Power Exchange, Taebaek Wind Power Co., Ltd., Taebaek Guinemi Wind Power Co., Ltd., Pyeongchang Wind Power Co., Ltd., Daeryun Power Co., Ltd., Changjuk Wind Power Co., Ltd., KNH Solar Co., Ltd., S-Power Xe-Pian Xe-Namnoy Joint ventures (83 joint ventures) Daegu Green Power Co., Ltd., KEPCO SPC Power Corporation, KAPES, Inc., Honam Wind Power Co., Ltd., Jeongam 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 Sam-Yang NH-Amundi Shin-han Others (4 others) Korea Development Bank, Ulleungdo Natural Energy Co., Ltd., EWP Philippines Corporation, Ecollite Co., Ltd. (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, 2018, 2019 and 2020 are as follows: <Sales and Others> Sales and others Company name Transaction type 2018 2019 2020 In millions of won <Associates> Dongducheon Dream Power Co., Ltd. Electricity sales ￦ 6,093 7,071 7,757 Korea Gas Corporation Electricity sales 99,933 116,484 97,685 Daejung Offshore Wind Power Co., Ltd. Electricity sales 1 1 32 Daegu Photovoltaic Co., Ltd. Electricity sales 128 327 325 Haeng Bok Do Si Photovoltaic Power Co., Ltd. Electricity sales 2 2 2 Korea Electric Power Industrial Development Co., Ltd. Service 10,422 11,085 10,833 Goseong Green Power Co., Ltd. Electricity sales 10,024 19,245 47,701 Gangneung Eco Power Co., Ltd. Service 4,928 7,446 10,178 Shin Pyeongtaek Power Co., Ltd. Electricity sales 8,468 21,218 20,791 Noeul Green Energy Co., Ltd. Electricity sales 30 30 30 Samcheok Eco Materials Co., Ltd. Electricity sales 605 627 700 YTN Co., Ltd. Electricity sales 2,043 2,257 1,805 Busan Green Energy Co., Ltd. Electricity sales 19 18 34 Gunsan Bio Energy Co., Ltd. Electricity sales 3,611 4,755 102 Korea Electric Vehicle Charging Service Electricity sales 578 1,029 1,956 Tamra Offshore Wind Power Co., Ltd. Electricity sales 58 — — Daegu clean Energy Co., Ltd. Electricity sales 126 — — Gangwon Wind Power Co., Ltd. Electricity sales 2,402 2,433 2,109 Gwangyang Green Energy Co., Ltd. Electricity sales 874 122 23 Bigeum Resident Photovoltaic Power Co., Ltd. Electricity sales — — 85 Hyundai Green Power Co., Ltd. Design service 14,031 13,106 17,257 Korea Power Exchange Service 6,854 7,670 25,919 Taebaek Wind Power Co., Ltd. Service 614 991 226 Taebaek Guinemi Wind Power Co., Ltd. Electricity sales — 77 37 Pyeongchang Wind Power Co., Ltd. Design service 1,166 1,189 2,064 Daeryun Power Co., Ltd. Electricity sales 1,731 1,879 1,947 Changjuk Wind Power Co., Ltd. Electricity sales 758 927 2,067 GS Donghae Power Co., Ltd. Electricity sales 7,238 15,792 31,557 KNH Solar Co., Ltd. Electricity sales 17 17 16 S-Power Service 9,118 6,535 6,682 PND solar Co., Ltd. Electricity sales 12 407 409 Hyundai Ecoenergy Co., Ltd. Electricity sales — 117 167 YeongGwang Yaksu Wind Electric Co., Ltd. Electricity sales — 81 77 Korea Energy Solution Co., Ltd. Electricity sales — 52 7 Green Energy Electricity Generation Co., Ltd. Electricity sales — — 14 Namjeongsusang Solar Power Operation Co., Ltd. Electricity sales — — 14 Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 Electricity sales — — 291 Muan Solar Park Co., Ltd. Electricity sales ￦ — — 57 Suwon New Power Co., Ltd. Electricity sales — 5,606 2,974 Muan Sunshine Solar Power Plant Co., Ltd. Electricity sales — — 30 9 Associates (Overseas) Electricity sales and others 60,318 98,450 66,755 <Joint ventures> Naepo Green Energy Co., Ltd. Electricity sales 160 154 217 Cheongna Energy Co., Ltd. Service 11,688 9,922 13,791 DAYONE Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.) Service 1,718 3,437 4,816 Daegu Green Power Co., Ltd. Electricity sales 1,022 1,151 1,285 KAPES, Inc. Commission 648 504 476 Honam Wind Power Co., Ltd. Electricity sales 415 657 502 Jeongam Wind Power Co., Ltd. Electricity sales 724 1,198 1,213 Korea Power Engineering Service Co., Ltd. Service 840 348 203 Seokmun Energy Co., Ltd. Service 1,897 1,495 1,932 Incheon New Power Co., Ltd. Construction revenue 568 354 14 Chun-cheon Energy Co., Ltd. Electricity sales 2,471 2,397 2,657 Yeonggwangbaeksu Wind Power Co., Ltd. Electricity sales 1,540 1,744 1,788 Yeonggwang Wind Power Co., Ltd. Electricity sales 46 705 793 Sam-Yang Electricity sales — — 33 NH-Amundi Service — — 1,388 KW Nuclear Components Co., Ltd. Service 839 721 1,639 KEPCO-Uhde Inc. Electricity sales 17 15 8 Busan Shinho Solar Power Co., Ltd. Electricity sales 362 452 353 Daesan Green Energy Co., Ltd. Electricity sales — 39 703 Taebaek Gadeoksan Wind Power Co., Ltd. Electricity sales — — 3 Cheong-Song Noraesan Wind Power Co., Ltd. Electricity sales — 6 29 Saemangeum Solar Power Co., Ltd. Service — 2,230 2,846 Jaeun Resident Wind Power Plant Co., Ltd. Electricity sales — 105 — Dangjin Eco Power co., Ltd. Electricity sales 3,424 4 33 Bitsolar Energy Co., Ltd. Electricity sales — — 42 Haemodum Solar Co., Ltd. Electricity sales — — 4 Yeongam Solar Power Co., Ltd. Electricity sales — — 165 Solaseado Solar Power Co., Ltd. Electricity sales — — 66 29 Joint ventures (Overseas) Electricity sales and others 206,054 1,275,279 831,596 <Others> Yeongwol Energy Station Co., Ltd. Service 373 — — DS POWER Co., Ltd. Service 565 — — Ulleungdo Natural Energy Co., Ltd. Service 292 — — Korea Development Bank Electricity sales 3,524 3,948 4,248 Interest income 4,438 2,091 3,461 <Purchase and Others> Purchase and others Company name Transaction type 2018 2019 2020 In millions of won <Associates> Dongducheon Dream Power Co., Ltd. Electricity purchase ￦ 828,547 689,510 552,692 Korea Gas Corporation Purchase of power generation 5,191,243 4,049,486 3,270,972 Daegu Photovoltaic Co., Ltd. REC purchase 3,745 3,626 3,313 Haeng Bok Do Si Photovoltaic Power Co., Ltd. REC purchase 455 450 370 Korea Electric Power Industrial Development Co., Ltd. Electricity metering service 261,668 245,057 212,366 Goseong Green Power Co., Ltd. Electricity purchase — 32 — Gangneung Eco Power Co., Ltd. Service 19 — — Shin Pyeongtaek Power Co., Ltd. Electricity purchase — 119,162 520,737 Noeul Green Energy Co., Ltd. REC purchase 18,282 22,767 10,634 Samcheok Eco Materials Co., Ltd. Electricity purchase 3,819 9,425 10,713 YTN Co., Ltd. Service 322 333 353 Busan Green Energy Co., Ltd. Electricity purchase 25,123 13,811 18,678 Gunsan Bio Energy Co., Ltd. Electricity purchase — 3,022 24 Korea Electric Vehicle Charging Service Service 605 536 581 Tamra Offshore Wind Power Co., Ltd. Electricity purchase 8,371 — — Yaksu ESS Co., Ltd. Service — 1,191 217 Gangwon Wind Power Co., Ltd. Electricity purchase 25,407 24,116 23,350 Hyundai Green Power Co., Ltd. Electricity purchase 480,815 507,662 349,778 Korea Power Exchange Trading fees 137,489 120,509 87,361 Taebaek Wind Power Co., Ltd. Electricity purchase 8,582 7,070 4,003 Taebaek Guinemi Wind Power Co., Ltd. Electricity purchase — 349 5,023 Pyeongchang Wind Power Co., Ltd. Electricity purchase 6,994 5,188 3,969 Daeryun Power Co., Ltd. Electricity purchase 184,063 144,862 99,523 Changjuk Wind Power Co., Ltd. Electricity purchase 7,929 6,994 6,084 GS Donghae Electric Power Co., Ltd. Electricity purchase 780,233 681,379 660,351 KNH Solar Co., Ltd. Electricity purchase 3,586 3,377 3,564 S-Power Electricity purchase 507,875 522,469 293,515 Hadong Mineral Fiber Co., Ltd. Service 60 — — Green Biomass Co., Ltd. Woodchip purchase 440 — — YeongGwang Yaksu Wind Electric Co., Ltd Electricity purchase 2,437 6,511 9,151 PND solar Co., Ltd. Electricity purchase — 557 5,234 Hyundai Ecoenergy Co., Ltd. Electricity purchase — 6,810 17,777 Korea Energy Solution Co., Ltd. Electricity purchase — 15 — Gwangbaek Solar Power Investment Co., Ltd. Electricity purchase — — 373 9 Associates (Overseas) Electricity purchase and 31 — — <Joint ventures> Cheongna Energy Co., Ltd. Electricity purchase ￦ 58 58,747 66 DAYONE Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.) Electricity purchase 3,445 2,847 1,120 Daegu Green Power Co., Ltd. Electricity purchase 287,008 296,464 215,224 KAPES, Inc. Service 77,758 142,511 219,673 Honam Wind Power Co., Ltd. Electricity purchase 7,700 5,306 4,382 Jeongam Wind Power Co., Ltd. Electricity purchase — — 5,982 Korea Power Engineering Service Co., Ltd. Service 1,765 1,774 1,594 Seokmun Energy Co., Ltd. Electricity purchase 31,759 26,370 33,164 Chun-cheon Energy Co., Ltd. Electricity purchase 320,954 313,471 222,069 Yeonggwangbaeksu Wind Power Co., Ltd. Electricity purchase 11,366 11,739 11,232 Yeonggwang Wind Power Co., Ltd. Electricity purchase — 11,940 24,103 Sam-Yang Electricity purchase — — 3,848 Busan Shinho Solar Power Co., Ltd. REC purchase 7,901 7,843 7,296 Global Trade Of Power System Co., Ltd. Service 565 502 337 Expressway Solar-light Power Generation Co., Ltd. REC purchase 3,513 3,067 2,472 Daesan Green Energy Co., Ltd. Electricity purchase — — 104,854 Dangjin Eco Power Co., Ltd. Electricity purchase — — 3,953 Busan Industrial Solar Power Co., Ltd. Electricity purchase — — 19 Haemodum Solar Co., Ltd. Electricity purchase — — 967 Yeongam Solar Power Co., Ltd. Electricity purchase — — 32,208 Solaseado Solar Power Co., Ltd. Electricity purchase — — 28,516 29 Joint ventures (Overseas) Electricity purchase and 1,404 7,232 14,767 <Others> Yeongwol Energy Station Co., Ltd. REC purchase 4,019 — — Ulleungdo Natural Energy Co., Ltd. Service 63 — — Korea Development Bank Interest expense 5,043 4,063 3,872 Dividend paid 166,876 20 17 (4) Receivables and payables arising from related party transactions as of December 31, 2019 and 2020 are as follows: Receivables Payables Company name Type 2019 2020 2019 2020 In millions of won <Associates> Dongducheon Dream Power Co., Ltd. Trade receivables ￦ 323 388 — — Non-trade receivables and others 267 213 — — Trade payables — — 85,920 65,794 Non-trade — — 12 — Korea Gas Corporation Trade receivables ￦ 9,267 9,969 — — Non-trade 38 95 — — Trade payables — — 462,138 428,763 Non-trade — — 560 617 Daejung Offshore Wind Power Co., Ltd. Non-trade — 31 — — Daegu Photovoltaic Co., Ltd. Trade payables — — 69 57 Korea Electric Power Industrial Development Co., Ltd. Trade receivables 243 508 — — Non-trade 43 16 — — Trade payables — — 3,756 133 Non-trade — — 3,827 3,779 Goseong Green Power Co., Ltd. Trade receivables 103 2,181 — — Non-trade 5,285 9,214 — — Non-trade — — 65,626 64,986 Gangneung Eco Power Co., Ltd. Trade receivables 115 661 — — Non-trade 65 146 — — Shin Pyeongtaek Power Co., Ltd. Trade receivables 1,013 1,348 — — Non-trade 2,281 2,823 — — Trade payables — — 64,696 47,948 Non-trade — — 61 85 Noeul Green Energy Co., Ltd. Trade receivables 3 3 — — Non-trade — 969 — — Non-trade — — 1,855 — Samcheok Eco Materials Co., Ltd. Trade receivables 59 47 — — YTN Co., Ltd. Trade receivables 97 97 — — Busan Green Energy Co., Ltd. Trade receivables 1 5 — — Non-trade — 13,946 — — Non-trade — — 606 — Korea Electric Vehicle Charging Service Trade receivables 137 141 — — Non-trade 529 281 — — Yaksu ESS Co., Ltd. Trade payables — — 525 739 Gangwon Wind Power Co., Ltd. Trade receivables 7 6 — — Trade payables — — 2,979 2,678 Gwangyang Green Energy Co., Ltd. Non-trade 1,334 1,356 — — Hyundai Green Power Co., Ltd. Trade receivables ￦ 502 554 — — Trade payables — — 41,587 9,825 Korea Power Exchange Trade receivables 1,142 1,608 — — Non-trade 144 24 — — Trade payables — — — 1,362 Non-trade — — 4,160 70,456 Ecollite Co., Ltd. Non-trade 210 — — — Taebaek Wind Power Co., Ltd. Non-trade — 1,405 — — Trade payables — — 358 443 Non-trade — — 243 — Taebaek Guinemi Wind Power Co., Ltd. Non-trade 2 — — — Trade payables — — 190 413 Non-trade — — — 509 Pyeongchang Wind Power Co., Ltd. Trade receivables 4 3 — — Daeryun Power Co., Ltd. Trade receivables 144 189 — — Trade payables — — 19,843 16,079 Changjuk Wind Power Co., Ltd. Trade payables — — 447 461 Non-trade — — 280 309 GS Donghae Electric power Co., Ltd. Trade receivables 175 386 — — Non-trade 367 321 — — Trade payables — — 69,811 91,213 Non-trade — — 16 36 KNH Solar Co., Ltd. Trade receivables 1 1 — — Trade payables — — — 14 Non-trade — — — 187 S-Power Trade receivables 89 137 — — Non-trade 43 46 — — Trade payables — — 53,705 23,415 PND solar Co., Ltd. Trade payables — — — 58 Hyundai Ecoenergy Co., Ltd. Trade receivables 16 16 — — YeongGwang Yaksu Wind Electric Co., Ltd. Trade receivables 5 8 — — Muan Solar Park Co., Ltd. Trade receivables — 24 — — Go deok Clean Energy Co., Ltd. Non-trade — 1 — — Suwon New Power Co., Ltd. Trade receivables ￦ — 2 — — Non-trade 2,939 712 — — 6 Associates (Overseas) Non-trade 1,112 3,248 — — <Joint ventures> Naepo Green Energy Co., Ltd. Trade receivables 18 56 — — DAYONE Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.) Trade receivables 128 57 — — Non-trade 12,532 11,749 — — Trade payables — — 175 10 Non-trade — — 9,178 9,119 Daegu Green Power Co., Ltd. Trade receivables 113 44 — — Non-trade 1 55 — — Trade payables — — 28,980 26,213 KAPES, Inc. Trade receivables 1 2 — — Non-trade — 5,172 — — Non-trade — — 50,738 20,577 Honam Wind Power Co., Ltd. Trade payables — — 347 216 Non-trade — — 1,671 345 Jeongam Wind Power Co., Ltd. Trade receivables 165 — — — Non-trade — 162 — — Non-trade — — 6 692 Korea Power Engineering Service Co.,Ltd. Non-trade 74 43 — — Seokmun Energy Co., Ltd. Trade receivables 51 62 — — Non-trade 136 9,460 — — Trade payables — — — 4,898 Non-trade — — 4,750 9,559 Chun-cheon Energy Co., Ltd. Trade receivables 260 98 — — Non-trade 5,362 165 — — Trade payables — — 23,438 27,428 Yeonggwangbaeksu Wind Power Co., Ltd. Trade receivables 6 8 — — Non-trade 157 159 — — Trade payables — — 671 405 Non-trade — — 1,526 1,747 Cheongna Energy Co., Ltd. Trade receivables 1,074 1,592 — — Non-trade — 1,186 — — Yeonggwang Wind Power Co., Ltd. Trade receivables ￦ 10 12 — — Non-trade 54 54 — — Trade payables — — — 886 Non-trade — — 2,432 3,038 Sam-Yang Trade receivables — 5 — — Non-trade — — — 625 KW Nuclear Components Co., Ltd. Trade receivables 4 4 — — Non-trade 15 — — — KEPCO-Uhde Inc. Non-trade — — 9 — Busan Shinho Solar Power Co., Ltd. Trade receivables 2 2 — — Trade payables — — 148 135 Non-trade — — 733 780 Daesan Green Energy Co., Ltd. Trade receivables 6 11 — — Non-trade — 216 — — Trade payables — — — 7,694 Taebaek Gadeoksan Wind Power Co., Ltd. Non-trade — 5 — — Trade payables — — — 2,473 Non-trade — — — 5 Cheong-Song Noraesan Wind Power Co., Ltd. Trade receivables 1 2 — — Saemangeum Solar Power Co., Ltd. Non-trade 2,197 3,141 — — Dangjin Eco Power Co., Ltd. Trade receivables 2 3 — — Trade payables — — — 326 Busan Industrial Solar Power Co., Ltd. Trade payables — — — 1 Yeongam Solar Power Co., Ltd. Trade receivables — 26 — — Trade payables — — — 14,652 15 Joint ventures (Overseas) Trade receivables 51,700 58,839 — — Non-trade 13,652 17,217 — — Non-trade — — 87,395 105,682 <Others> Korea Development Bank Accrued interest income 1,630 51 — — Non-trade 146,416 206,916 — — Non-trade — — 152 123 Derivatives 41,368 20,167 6,531 20,001 (5) Loans and others arising from related party transactions as of December 31, 2019 and 2020 are as follows: Type Company name Beginning Loans Collection Others Ending balance In millions of won Associates KNOC Nigerian East Oil Co., Ltd., KNOC Nigerian West Oil Co., Ltd. ￦ 28,676 92 — (1,619 ) 27,149 (Allowance for doubtful accounts) (7,325 ) — — 2,079 (5,246 ) Associates PT. Cirebon Electric Power 578 — (609 ) 31 — Associates Xe-Pian Xe-Namnoy 20,955 — — (1,263 ) 19,692 Associates PT. Wampu Electric Power 16,502 — (4,474 ) 330 12,358 Associates Gunsan Bio Energy Co., Ltd. 12,396 — — — 12,396 (Allowance for doubtful accounts) (10,128 ) — — — (10,128 ) Associates Bigeum Resident Photovoltaic Power Co., Ltd. — 3,500 — — 3,500 Associates Daejung Offshore Wind Power Co., Ltd. — 1,000 — — 1,000 Joint ventures DAYONE Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.) 2,465 — (2,465 ) — — (Allowance for doubtful accounts) (2,465 ) — 2,465 — — Joint ventures Solaseado Solar Power Co., Ltd. — 64,000 — — 64,000 Joint ventures Recursos Solares PV De Mexico II, S.A. De C.V. DE C.V. 1,055 4,458 — (669 ) 4,844 Joint ventures Horus Solar, S.A. De C.V. 3,323 11,404 — (1,347 ) 13,380 Joint ventures SUNMEX RENOVABLES, S.A. DE C.V. 144 1,755 — (57 ) 1,842 Joint ventures Kelar S.A. 42,158 — — (2,542 ) 39,616 Joint ventures Chun-cheon Energy Co., Ltd. 5,057 — (5,057 ) — — Joint ventures DE Energia SpA 6,632 — — (400 ) 6,232 Joint ventures Daehan Wind Power PSC — 11,852 — (1,152 ) 10,700 Joint ventures PT. Tanjung Power Indonesia — 777 — (72 ) 705 Joint ventures Bitsolar Energy Co., Ltd., — 3,165 — — 3,165 ￦ 120,023 102,003 (10,140 ) (6,681 ) 205,205 (6) Borrowings arising from related party transactions as of December 31, 2019 and 2020 are as follows: Related parties Type Beginning balance Borrowings Repayment Others Ending balance In millions of won Korea Development Bank Facility ￦ 59,845 — (9,552 ) — 50,293 Others 3,500 — (554 ) — 2,946 Operating funds 179,000 152,961 (187,511 ) (150 ) 144,300 Syndicated Loan 17,085 — (1,063 ) (99 ) 15,923 EBL — 43,485 — (3,392 ) 40,093 (7) Guarantees provided to associates or joint ventures as of December 31, 2020 are as follows: Primary guarantor Principal obligor Type of guarantees Credit limit Guarantee In millions of Korea Electric Power Corporation Shuweihat Asia Performance guarantees USD 11,000 Shuweihat Asia Power Korea Electric Power Corporation Rabigh Performance guarantees USD 1,387 Rabigh Electricity Korea Electric Power Corporation Nghi Son 2 Power Performance guarantees USD 70,000 SMBC Ho Chi Minh Debt guarantees USD 285,000 SMBC Singapore Korea Electric Power Corporation Barakah One Debt guarantees USD 900,000 Export-Import Bank Performance guarantees USD 4,439,920 Korea Electric Power Corporation RE Holiday Performance USD 206,494 EPS Renewables Korea Electric Power Corporation RE Pioneer Performance guarantees USD 158,718 EPS Renewables Korea Electric Power Corporation RE Barren Ridge 1 Performance USD 135,783 Firstar Development, Korea Electric Power Corporation Rabigh Electricity Performance guarantees SAR 6,508 Hana Bank Performance guarantees SAR 68,054 Korea Electric Power Corporation Shuweihat Asia Performance guarantees USD 100,000 ING Bank Korea Electric Power Corporation Amman Asia Performance guarantees USD 16,800 Shinhan Bank Korea Electric Power Corporation Pulau Indah Power Performance guarantees MYR 7,500 Maybank Korea Western Power Co., Ltd. Cheongna Energy Collateralized money KRW 4,940 Kookmin Bank and Guarantees for — Korea Western Power Co., Ltd. Xe-Pian Xe-Namnoy Payment guarantees for USD 2,500 Krung Thai Bank Collateralized money KRW 64,570 Impounding bonus USD 5,000 SK E&C Korea Western Power Co., Ltd. Rabigh Performance guarantees SAR 11,200 National Bank of Korea Western Power Co., Ltd. Daegu Photovoltaic Collateralized money KRW 2,066 Korea Development Korea Western Power Co., Ltd. Dongducheon Collateralized money KRW 45,041 Kookmin Bank and Debt guarantees KRW 20,300 BNK Securities Korea Western Power Co., Ltd. PT. Mutiara Jawa Collateralized money KRW 1,780 Woori Bank Korea Western Power Co., Ltd. Haeng Bok Do Si Collateralized money KRW 210 Nonghyup Bank Korea Western Power Co., Ltd. Shin Pyeongtaek Collateralized money KRW 69,591 Kookmin Bank Guarantees for — Kookmin Bank and Korea Western Power Co., Ltd. Haemodum Solar Collateralized money KRW 3,065 Nonghyup Bank Korea Western Power Co., Ltd. Sam-Yang Collateralized money KRW 5,535 Korea Development Guarantees for — Korea Western Power Co., Ltd. Muan Solar Park Collateralized money KRW 4,180 IBK and others Korea Western Power Co., Ltd. Anjwa Smart Collateralized money KRW 5,510 Hana Bank and others Guarantees for — Korea East-West Power Co., Ltd. Busan Shinho Solar Collateralized money KRW 5,378 Korea Development Korea East-West Power Co., Ltd. Seokmun Energy Collateralized money KRW 14,814 Kookmin Bank and Guarantees for — Korea East-West Power Co., Ltd. Chun-cheon Energy Collateralized money KRW 27,518 Kookmin Bank and Guarantees for KRW 90,800 Korea East-West Power Co., Ltd. Honam Wind Collateralized money KRW 3,887 Shinhan Bank and Guarantees for — Korea East-West Power Co., Ltd. GS Donghae Collateralized money KRW 244,426 Korea Development Guarantees for — Korea East-West Power Co., Ltd. Yeonggwangbaeksu Collateralized money KRW 3,124 Kookmin Bank and Korea East-West Power Co., Ltd. Yeonggwang Wind Collateralized money KRW 17,256 KDB Capital Guarantees for — Korea East-West Power Co., Ltd. Daesan Green Collateralized money KRW 22,552 IBK Guarantees for KRW 18,989 Korea East-West Power Co., Ltd. Taebaek Gadeoksan Collateralized money KRW 13,362 Samsung Fire & Korea East-West Power Co., Ltd. PT. Tanjung Power Debt guarantees USD 24,544 Sumitomo mitsui Other guarantees USD 3,150 PT Adaro Indonesia Guarantees for — Sumitomo mitsui Collateralized money KRW 33,063 MUFG and others Korea East-West Power Co., Ltd. South Jamaica Performance guarantees USD 14,400 Societe Generale Collateralized money KRW 31,897 JCSD Trustee EWP Barbados 1 SRL South Jamaica Guarantees for — JCSD Trustee Korea East-West Power Co., Ltd. DE Energia SpA Collateralized money KRW 8,187 Mirae Asset Daewoo Debt guarantees USD 5,728 Payment USD 1,066 Hana Bank Korea East-West Power Co., Ltd. Bitsolar Energy Collateralized money KRW 352 Mirae Asset Life Korea Southern Power Co., Ltd. KNH Solar Co., Collateralized money KRW 2,436 Shinhan Bank and Performance guarantees — Korea Southern Power Co., Ltd. Daeryun Power Collateralized money KRW 26,353 Korea Development Guarantees for KRW 8,000 Korea Southern Power Co., Ltd. Daegu Green Power Collateralized money KRW 23,045 Shinhan Bank and Performance guarantees — Korea Southern Power Co., Ltd. Kelar S.A. Performance guarantees USD 57,987 Hana Bank, MUFG Korea Southern Power Co., Ltd. Daehan Wind Performance guarantees USD 3,600 Shinhan Bank Payment USD 1,898 Hana Bank Korea Southern Power Co., Ltd. Pyeongchang Wind Collateralized money KRW 5,027 Woori Bank and Performance guarantees — Korea Southern Power Co., Ltd. Taebaek Guinemi Collateralized money KRW 3,087 IBK Korea Southern Power Co., Ltd. Jeongam Wind Performance guarantees — SK Securities.Co., Collateralized money KRW 4,620 Korea Southern Power Co., Ltd. Samcheok Eco Payment — SEM Investment Co., Korea Southern Power Co., Ltd. Solaseado Solar Collateralized money KRW 7,379 Kookmin Bank and Korea Southern Power Co., Ltd. Naepo Green Collateralized money — IBK and others Guarantees for KRW 30,000 Guarantees for other — KOSPO Chile SpA Kelar S.A. Collateralized money KRW 71,449 Export-Import Bank KOSPO Chile SpA Chester Solar I SpA Collateralized money KRW 1,621 IBK KOSPO Chile SpA Chester Solar IV Collateralized money KRW 1,064 KOSPO Chile SpA Chester Solar V Collateralized money KRW 277 KOSPO Chile SpA Diego de Almagro Collateralized money KRW 1,490 KOSPO Chile SpA Laurel SpA Collateralized money KRW 1,092 Korea Midland Power Co., Ltd. YeongGwang Collateralized money KRW 312 IBK and others Korea Midland Power Co., Ltd. Hyundai Green Collateralized money KRW 132,774 Korea Development Korea Midland Power Co., Ltd. PT. Cirebon Debt guarantees USD 10,038 Mizuho Bank Korea Midland Power Co., Ltd. PT. Wampu Debt guarantees USD 5,271 SMBC Korea Midland Power Co., Ltd. Green Energy Collateralized money KRW 25 IBK Guarantees for — IBK and others Korea Midland Power Co., Ltd. Yaksu ESS Co., Collateralized money KRW 454 IBK Korea Midland Power Co., Ltd. Namjeongsusang Collateralized money KRW 103 IBK Korea Midland Power Co., Ltd. Gwangbaek Solar Collateralized money KRW 4,682 Kyobo Life Insurance Korea Midland Power Co., Ltd. Muan Sunshine Collateralized money KRW 1,096 IBK Korea Midland Power Co., Ltd. Goesan Solar Park Collateralized money KRW 1,684 IBK Korea Midland Power Co., Ltd. Bitgoel Eco Energy Collateralized money KRW 29 IBK and others Guarantees for — Korea South-East Power Co., Ltd. DAYONE Energy Collateralized money — IBK Guarantees for KRW 76,800 NH investment & Korea South-East Power Co., Ltd. S-Power Collateralized money KRW 110,292 Korea Development Korea South-East Power Co., Ltd. RES Technology Collateralized money KRW 15,930 UniCredit Bulbank Korea South-East Power Co., Ltd. ASM-BG Collateralized money KRW 18,200 UniCredit Bulbank Korea South-East Power Co., Ltd. Expressway Solar- Guarantees for KRW 2,500 Woori Bank Korea South-East Power Co., Ltd. Goseong Green Collateralized money KRW 2,186 Kyobo Life Insurance Korea South-East Power Co., Ltd. Gangneung Eco Collateralized money KRW 2,368 Kyobo Life Insurance Korea South-East Power Co., Ltd. PND solar Co., Ltd. Collateralized money KRW 1,149 IBK Korea South-East Power Co., Ltd. Hyundai Eco Collateralized money KRW 4,250 Samsung Life Korea South-East Power Co., Ltd. Jaeun Resident Collateralized money KRW 2,195 IBK Korea South-East Power Co., Ltd. Cheongsong Collateralized money KRW 4,124 Kyobo Life Insurance Korea South-East Power Co., Ltd. Youngam Solar Collateralized money KRW 6,042 Kookmin Bank and Korea South-East Power Co., Ltd. Samsu Wind Power Collateralized money KRW 2,607 Shinhan Bank and Korea South-East Power Co., Ltd. Saemangeum Collateralized money KRW 11,022 Woori Bank and Korea Hydro & Nuclear Power Co., Ltd. Noeul Green Collateralized money KRW 4,197 Hana Bank and others Korea Hydro & Nuclear Power Co., Ltd. Busan Green Collateralized money KRW 8,778 Shinhan Bank and Korea Hydro & Nuclear Power Co., Ltd. Cheong-Song Collateralized money KRW 3,453 Woori Bank and KEPCO Plant Service & Engineering Co., Ltd. Incheon New Collateralized money — Shinhan Bank Guarantees for — (*1) The Company guarantees to provide supplemental funding for business with respect to excessive business expenses or insufficient repayment of borrowings. (*2) The Company has granted the right to Hana Financial Investment Co., Ltd., as an agent for the creditors to Expressway Solar-light Power Generation Co., Ltd. (“ESPG”), to the effect that in the event of acceleration of ESPG’s payment obligations under certain borrowings to such creditors, Hana Financial may demand the Company to dispose of shares in ESPG held by the Company and apply the resulting proceeds to repayment of ESPG’s obligations. (*3) This includes a guarantee for the shareholder’s capital payment in connection with the business of 190MW gas complex thermal power plant in Jamaica. EWP Barbados 1 SRL’s capital contribution amount is USD 18,400 thousand and there is no residual guarantee amount among total collateral limit. (*4) Controlling and non-controlling pre-emption (*5) The Company recognized an impairment loss on all of the equity securities of DAYONE Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.) before the prior year, and the acquisition cost of the securities provided as collateral is ￦47,067 million. (*6) 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. (*7) The common stocks of Dongducheon Dream Power Co., Ltd. held by the Company were pledged as collateral. (*8) 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. (*9) The Company provided a payment guarantee to Daehan Wind Power PSC for opening LC for Debt Service Reserve Account (DSRA). (*10) This includes a guarantee related to LC for debt repayment allowance provided to DE Energia SpA, a joint venture of the Company. (*11) 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. (*12) 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. (8) As of December 31, 2020, there is no financial guarantee provided by related parties. (9) Derivatives transactions with related parties as of December 31, 2020 are as follows: (i) Currency Swap Counterparty Contract Contract Amount 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 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 2020~20

Non-Cash Transactions

Non-Cash Transactions	12 Months Ended
	Dec. 31, 2020
Non-Cash Transactions [Abstract]
Non-Cash Transactions	48. Statement of Cash Flows (1) Significant non-cash Transactions 2018 2019 2020 In millions of won Transfer from construction-in-progress ￦ 8,656,252 14,052,094 10,189,527 Recognition of asset retirement cost and related provision for decommissioning costs 310,272 2,425,668 895,507 Transfer from provision for disposal of spent nuclear fuel to accrued expenses 482,699 376,103 395,921 Transfer from long-term borrowings and debt securities to current portion of long-term borrowings and debt securities 7,100,846 7,759,284 9,237,883 Transfer from inventory to stored nuclear fuel — 1,129,374 1,055,974 Transfer of right-of-use — 5,364,647 291,334 (2) Changes in liabilities incurred from financing activities for the years ended December 31, 2019, and 2020 are as follows: 2019 Non-cash Beginning Cash flows Increase Changes in Effect of Increase Ending balance In millions of won Borrowings and debt securities ￦ 61,034,626 6,342,074 — — 496,940 2,900 67,876,540 Lease liabilities 283,806 (573,437 ) 218,800 4,943,584 197,380 — 5,070,133 ￦ 61,318,432 5,768,637 218,800 4,943,584 694,080 2,900 72,946,673 2020 Non-cash Beginning Cash flows Increase Effect of 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

Commitments for Expenditure

Commitments for Expenditure	12 Months Ended
	Dec. 31, 2020
Commitments for Expenditure [Abstract]
Commitments for Expenditure	49. Commitments for Expenditure (1) The commitments for acquisition of property, plant and equipment as of December 31, 2019 and 2020 are as follows: 2019 2020 Contracts Commitment Remaining Commitment Remaining In millions of won Purchase of cable (PVC, 1C, 2000SQ) 153,000M and others (Shin-Bupyung-Youngseo) ￦ 56,408 24,721 56,574 16,038 Purchase of cable (PVC, 1C, 2500SQ) 103,374M and others (Bukdangjin-Shin-Tangjung) 45,390 32,876 45,390 32,876 Purchase of GIS (362kV, 6300A, 63kA) 23CB – Youngseo S/S 36,143 36,143 36,143 29,898 Purchase of GIS (362kV, 6300A, 63kA) 26CB – Hwasung S/S 40,010 15,300 40,010 8,328 Purchase of GIS (362kV, 6300A, 63kA) 27CB – Kwangyang S/S 37,744 9,700 37,744 2,244 Purchase of cable (FR CNCO-W, 59,716 37,249 59,716 37,249 Purchase of switch (Eco) 9,360 units 40,631 24,031 40,631 24,031 Purchase of cable (TR CNCE-W/AL, 36,063 6,243 35,708 — Purchase of cable (TR CNCE-W,1C,600SQ) — — 37,288 23,100 Purchase of cable (TR CNCE-W/AL,1C,400SQ) — — 82,622 51,130 Purchase of cable (FR CNCO-W,1C,325SQ) — — 42,068 35,358 Concrete pole (10M, general purpose, 350KGF) 102,435 ea and five other equipments ￦ — — 91,889 80,904 Construction of Shin-Kori units (#5,6) 8,625,387 4,479,956 8,625,387 3,256,117 Construction of Shin-Hanul units (#1,2) 8,306,149 — 9,443,635 160,512 Other 20 contracts 352,710 122,890 107,586 58,466 Service of designing Seoul Combined units (#1,2) 30,778 2,119 31,841 984 Purchase of main machine for construction of Seoul Combined units (#1,2) 331,249 15,918 331,249 — Construction of Seoul Combined units (#1,2) 387,722 31,150 409,597 — Service of designing Shin-Boryeong units (#1,2) 120,668 888 121,163 521 Purchase of main machine for construction of Shin-Boryeong units (#1,2) 816,317 4,955 816,317 — Purchase of furnace for construction of Shin-Seocheon thermal power plant 305,209 43,388 305,209 29,042 Purchase of turbine generator for construction of Shin-Seocheon thermal power plant 105,226 10,736 105,226 8,279 Electricity construction of Shin-Seocheon thermal power plant 231,196 87,874 282,234 13,524 Purchase of main machine for Jeju LNG combined 166,287 12,088 166,287 11,182 Service of designing Taean units (#9,10) 112,483 12,862 112,813 12,933 Purchase of gas turbine and turbine equipment of Gimpo combined heat & power plant 104,600 104,600 104,600 41,840 Purchase of steam turbine, HRSG and POWER BLOCK of Gimpo combined heat & power plant — — 210,900 147,630 Purchase of coal handling machine for construction of Samcheok units (#1,2) 282,927 42,785 285,158 22,751 Purchase of furnace main equipment for construction of Samcheok units (#1,2) 1,066,824 11,771 1,065,141 11,609 Purchase of turbine main equipment for Samcheok units (#1,2) 223,550 132 211,349 125 Purchase of main equipment for Namjeju 138,486 84,982 140,144 112 (2) As of December 31, 2020, 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 quantity 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 1,572 Ton U (contract period : 2009~2024).

Contingencies and Commitments

Contingencies and Commitments	12 Months Ended
	Dec. 31, 2020
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, 2019 and 2020 are as follows: 2019 2020 Number Claim Number Claim In millions of won As the defendant 586 ￦ 697,835 663 ￦ 550,535 As the plaintiff 199 707,287 200 729,798 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 dismissed on January 8, 2021. Thus plaintiffs filed an appeal to the Supreme Court of Korea. The Company joined these litigations as a stakeholder after obtaining permission from the court. As of December 31, 2020, 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, 2020. 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 due to disagreements over contract details regarding the construction of the waste refinement power generation plant for Next Energy Co., Ltd., including commencement of commercial operation, however, the Company has not recognized any provision, as the outcome of the lawsuit and the related amount and timing of economic benefit outflow that the Company may be liable for cannot be reasonably estimated as of December 31, 2020. 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 ￦8,307 million as litigation provisions in relation to the lawsuit as of December 31, 2020. In addition to the abovementioned significant ongoing claims, there are 10 arbitration cases pertaining to the Company as of December 31, 2020 and the significant arbitration cases for the year ended December 31, 2020 are as follows: ① The Company has been accused of breach of contract in relation to ERP software, which is provided by SAP Korea Ltd. The litigation was filed in the International Court of Arbitration of the International Chamber of Commerce. The Company has recognized ￦1,319 million of litigation provision in relation to the lawsuit. ② 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. ③ 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, 2019 and 2020 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 16,000 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 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 ￦ ⑦ 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, 2020. (3) Credit lines provided by financial institutions as of December 31, 2020 are as follows: Commitments Financial institutions Currency Credit limit Used amount In millions of won and thousands of Commitments on Bank-overdraft Nonghyup Bank and others KRW 1,936,500 229,960 Commitments on Bank-daylight overdraft Nonghyup Bank KRW 280,000 — Limit amount available for CP Hana Bank KRW 1,150,000 1,150,000 Limit amount available for card Hana Bank and others KRW 47,104 5,378 Banco de Oro PHP 5,000 3,000 Loan limit Kookmin Bank and others KRW 1,752,333 957,924 DBS Bank and others USD 1,809,700 55,393 Certification of payment on payables from foreign country Nonghyup Bank USD 8,700 7,912 Certification of payment on L/C Shinhan Bank and others USD 938,400 90,240 Mizuho Bank MXN 3,666 3,666 Certification of Performance guarantee on contract Seoul Guarantee Insurance and others KRW 66,890 59,677 First Abu Dhabi Bank and others USD 1,036,334 834,223 Korea Development Bank and others JPY 637,670 637,670 Hana Bank EUR 4,065 4,065 Shinhan Bank INR 6,806 6,806 Hana Bank CAD 148 148 Maybank MYR 7,500 7,500 Hana Bank SAR 68,054 68,054 Certification of bidding Hana Bank USD 10,000 197 Hana Bank EUR 2 2 Advance payment bond, Warranty bond, Retention bond and others Seoul Guarantee Insurance KRW 40,153 40,153 Export-Import Bank of Korea and others USD 550,616 498,761 Hana Bank SAR 6,508 6,508 Hana Bank MXN 20,538 20,538 Others Nonghyup Bank and others KRW 654,162 32,009 Export-Import Bank of Korea and others USD 2,268,158 1,819,226 Shinhan Bank JPY 381,210 381,210 Standard Chartered AED 50 50 Shinhan Bank MXN 6,471 4,901 Inclusive credit Hana Bank KRW 8,000 927 Hana Bank and others USD 30,722 17,236 Shinhan Bank INR 70,028 70,028 Trade finance BNP Paribas and others USD 750,000 — (4) As of December 31, 2019, blank check and assets provided as collaterals or pledges to financial institutions by the Company are follows: Guarantor Guarantee Type of guarantee 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) SE Green Energy Co., Ltd. DB Insurance Co., Ltd. and others Property, plant and equipment and others KRW 149,500 Collateral for borrowings(*2) Gyeonggi Green Energy Co., Ltd. Korea Development Bank and others Cash and cash equivalents KRW 327,800 Collateral for borrowings(*2) Commerce and Industry Energy Co., Ltd. IBK and others Land, buildings, structures and machinery and others KRW 110,500 Collateral for borrowings(*2) KOSPO Youngnam Power Co., Ltd. Shinhan Bank and others Cash and cash equivalents KRW 396,120 Collateral for borrowings(*2) Gyeongju Wind Power Co., Ltd. Samsung Fire & Marine Insurance Co., Ltd. and Others Property, plant and equipment and others KRW 110,240 Collateral for borrowings(*2) Korea Offshore Wind Power Co., Ltd. Woori Bank and Others Utility plant 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) (*1) This is based on the amount of loan commitment limit. (*2) As of December 31, 2020, 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 Korea Energy Agency as of December 31, 2020. The Company has provided a blank check as a repayment guarantee. (5) The Company temporarily suspended operations of the Gangneung hydroelectric generating plant, with a carrying amount of ￦69,532 million as of December 31, 2020, to improve the quality of water used in generating electricity. The expenses related to the suspension of operations of ￦46 million and depreciation on the idle assets of ￦6,604 million are recorded in other expenses for the year ended December 31, 2020. 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, 2020. (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, 2020. The book value of facility is ￦15,524 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, 2020. (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, 2020. (8) To prevent the spread of COVID-19, COVID-19. COVID-19

Business Combination

Business Combination	12 Months Ended
	Dec. 31, 2020
Disclosure of detailed information about business combination [Abstract]
Disclosure of business combinations	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 (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 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 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, 2020
Subsequent Events [Abstract]
Subsequent Events	52. Subsequent Events Subsequent to December 31, 2020, Korea Hydro & Nuclear Power Co., Ltd., Korea South-East Power Co., Ltd., Korea Midland Power Co., Ltd., Korea Western Power Co., Ltd. and Korea Southern Power Co., Ltd. issued corporate bonds and global bond for operation, repayment of debts and investing in green new deal projects as follows: Company Type Issue date Maturity Interest rate Amount In millions of won and thousands of USD Korea Hydro & Nuclear Power Unsecured (Global bond) 2021.04.27 2026.04.27 1.25 % USD 500,000 Korea South-East Power Co., Ltd. Corporate bond 2021.01.26 2031.01.26 1.90 % KRW 180,000 Corporate bond 2021.01.26 2041.01.26 1.97 % KRW 90,000 Corporate bond 2021.01.26 2051.01.26 1.96 % KRW 30,000 Corporate bond 2021.04.08 2026.04.08 1.82 % KRW 140,000 Corporate bond 2021.04.08 2028.04.08 1.99 % KRW 50,000 Korea Midland Power Co., Ltd. Corporate bond 2021.04.02 2024.04.02 1.45 % KRW 90,000 Corporate bond 2021.04.21 2026.04.21 1.85 % KRW 190,000 Korea Western Power Co., Ltd. Corporate bond 2021.04.29 2024.04.29 1.39 % KRW 60,000 Corporate bond 2021.04.29 2026.04.29 1.87 % KRW 150,000 Corporate bond 2021.04.29 2031.04.29 2.18 % KRW 20,000 Korea Southern Power Co., Unsecured (Global bond 21) 2021.01.27 2026.01.27 0.75 % USD 450,000 Corporate bond 2021.04.14 2022.04.14 0.86 % KRW 150,000 Corporate bond 2021.04.14 2023.04.14 1.14 % KRW 70,000

Basis of Preparation (Policies)

Basis of Preparation (Policies)	12 Months Ended
	Dec. 31, 2020
Basis of Preparation [Abstract]
Statement of compliance	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	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	Functional and presentation currency These consolidated financial statements are presented in Korean won (“won”), which is also the functional currency of KEPCO and most of the significant operating subsidiaries.
Use of estimates and judgments	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, 2019 and 2020 are W W (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. 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. (vii) Early shutdown of 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, 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 Wolsong unit 1 on the grounds that its deficit was increasing and its economic efficiency was low due to the nonoptimal utilization rate. On December 24, 2019, NSSC approved permanent shutdown of unit 1. In addition, the Company has also decided to discontinue the construction of Cheonji unit 1 and 2 and Daejin unit 1 and 2 pursuant to the government policy. Accordingly, the Company recognized impairment loss and other expenses during the year ended December 31, 2018. Among the new nuclear power plants under construction, Shin-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 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. Korean government plans to refund to the Company for reasonable expenditures incurred in relation to the phase-out As of December 31, 2020, there is no indication that the above-mentioned impairment no longer exists or has been 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	Changes in accounting policies Changes in accounting standards effective from January 1, 2020 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, 2020, even though the early adoption of these standards is possible. Amendments to IFRS 3 ‘Business Combination’—Definition of a Business The amendment to IFRS 3 clarifies that to be considered a business, an integrated set of activities and assets must include, at a minimum, an input and a substantive process that together significantly contribute to the ability to create output. Furthermore, it clarified that a business can exist without including all of the inputs and processes needed to create outputs. Amendments to IFRS 7 ‘Financial Instruments : Disclosures’, IFRS 9 ‘Financial Instruments’, and IAS 39 ‘Financial Instruments : Recognition and Measurements’—Interest Rate Benchmark Reform The amendments to IFRS 9 and IAS 39 provide a number of reliefs, which apply to all hedging relationships that are directly affected by interest rate benchmark reform. A hedging relationship is affected if the reform gives rise to uncertainties about the timing or amount of benchmark-based cash flows of the hedged item or the hedging instrument. Amendments to IAS 1 ‘Presentation of Financial Statements’ and IAS 8 ‘Accounting Policies, Changes in Accounting Estimates and Errors’—Definition of Material The amendments provide a new definition of material that states “information is material if omitting, misstating or obscuring it could reasonably be expected to influence decisions that the primary users of general purpose financial statements make on the basis of those financial statements, which provide financial information about a specific reporting entity.” The amendments clarify that materiality will depend on the nature or magnitude of information, either individually or in combination with other information, in the context of the financial statements. A misstatement of information is material if it could reasonably be expected to influence decisions made by the primary users. The Conceptual Framework for Financial Reporting The Conceptual Framework is not a standard, and none of the concepts contained therein override the concepts or requirements in any standard. The purpose of the Conceptual Framework is to assist the IASB (International Accounting Standards Board) in developing standards, to help preparers develop consistent accounting policies where there is no applicable standard in place and to assist all parties to understand and interpret the standards. The revised Conceptual Framework includes some new concepts, provides updated definitions and recognition criteria for assets and liabilities and clarifies some important concepts. Amendments to IFRS 16 Covid-19 The amendments provide relief to lessees from applying IFRS 16 guidance on lease modification accounting for rent concessions arising as a direct consequence of the Covid-19 Covid-19 Covid-19

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2020
Significant Accounting Policies [Abstract]
Basis of consolidation	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	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 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	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	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	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	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	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. The Company adopted the cost pass-through tariff system from January 1, 2021 with the approval of the Ministry of Trade, Industry and Energy (MOTIE) on December 17, 2020, and the Company is currently analyzing the accounting policies regarding the adoption of the new system. (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.
Deferred Revenue	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	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	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	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	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	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	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	Property, plant and equipment Property, plant and equipment are initially measured at cost and after initial recognition, are carried at cost less accumulated depreciation and accumulated impairment losses. The cost of property, plant and equipment includes expenditures arising directly from the construction or acquisition of the asset, any costs directly attributable to bringing the asset to the location and condition necessary for it to be capable of operating in the manner intended by management and the initial estimate of the costs of dismantling and removing the item and restoring the site on which it is located. Subsequent costs are recognized in the carrying amount of property, plant and equipment at cost or, if appropriate, as separate items if it is probable that future economic benefits associated with the item will flow to the Company and the cost of the item can be measured reliably. The carrying amount of the replaced part is derecognized. The costs of the day-to-day Property, plant and equipment, except for land, are depreciated on a straight-line basis over estimated useful lives that appropriately reflect the pattern in which the asset’s future economic benefits are expected to be consumed. For loaded nuclear fuel related to long-term raw materials and spent nuclear fuels related to asset retirement costs, the Company uses the unit-of-production The estimated useful lives of the Company’s property, plant and equipment are as follows: Useful lives (years) Buildings 8 ~ 40 Structures 5 ~ 50 Machinery 2 ~ 32 Vehicles 3 ~ 8 Loaded heavy water 30 Asset retirement costs 18, 30, 40, 60 Right-of-use 1 ~ 65 Ships 9 Others 4 ~ 15 A component that is significant compared to the total cost of property, plant and equipment is depreciated over its separate useful life. Depreciation methods, residual values and useful lives of property, plant and equipment are reviewed at the end of each reporting period and if change is deemed appropriate, it is treated as a change in accounting estimate. Property, plant and equipment are derecognized on disposal, or when no future economic benefits are expected from its use or disposal. Gains or losses arising from derecognition of an item of property, plant and equipment, measured as the difference between the net disposal proceeds and the carrying amount of the asset, are recognized in profit or loss when the asset is derecognized.
Investment property	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	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	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	Impairment of non-financial assets other than goodwill 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	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	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	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 Both collecting contractual cash flows and selling financial assets FVOCI (*1) FVTPL (*2) 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	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	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.

Reporting Entity (Description_2

Reporting Entity (Description of the controlling company) (Tables)	12 Months Ended
	Dec. 31, 2020
Reporting Entity (Description of the controlling company) [Abstract]
The Company's shareholders	As of December 31, 2020, KEPCO’s share capital amounts to W Number of Percentage of ownership The Government of the Republic of Korea 116,841,794 18.20 % Korea Development Bank 211,235,264 32.90 % Foreign investors 106,414,565 16.58 % Other 207,472,454 32.32 % 641,964,077 100.00 %

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2020
Significant Accounting Policies [Abstract]
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
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

Segment, Geographic and Other_2

Segment, Geographic and Other Information (Tables)	12 Months Ended
	Dec. 31, 2020
Segment, Geographic and Other Information [Abstract]
Segment determination and explanation of the measurements	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
Financial information of the segments	Financial information of the segments for the years ended December 31, 2018, 2019 and 2020, respectively, are as follows: 2018 Segment Total Intersegment Revenue Depreciation Interest Interest Profit Employee Loss on Increase in Operating In millions of won Transmission and distribution W 59,676,952 1,393,120 58,283,832 3,555,158 77,925 708,329 287,268 144,180 424,774 580,931 (1,814,363 ) Electric power generation (Nuclear) 8,858,717 8,833,787 24,930 3,088,019 30,422 503,161 9,946 76,467 38,886 520,167 357,401 Electric power generation (Non-nuclear) 25,204,085 24,389,816 814,269 3,269,023 29,313 577,441 58,993 91,140 17,516 (227,234 ) 482,418 Plant maintenance & engineering service 2,526,126 2,170,959 355,167 114,030 12,505 4,126 1,956 77,526 — 174,785 314,755 Others 996,300 441,436 554,864 55,513 117,878 119,037 — 1,742 — 356 102,421 Consolidation adjustments (37,229,118 ) (37,229,118 ) — (56,949 ) (44,276 ) (43,636 ) — (30,480 ) — 7,989 (127,741 ) W 60,033,062 — 60,033,062 10,024,794 223,767 1,868,458 358,163 360,575 481,176 1,056,994 (685,109 ) Finance income 796,870 Finance expense (2,470,743 ) Gain related to associates, joint ventures and subsidiaries 358,163 Loss before income tax W (2,000,819 ) 2019 Segment Total Intersegment Revenue Depreciation Interest Interest Profit (loss) Employee Loss on Increase in Operating In millions of won Transmission and distribution W 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 ) W 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 W (3,265,838 ) 2020 Segment Total 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 Profit before income tax ￦ 2,991,533
Information related to segment assets and liabilities	Information related to segment assets and segment liabilities as of and for the years ended December 31, 2019 and 2020 are as follows: 2019 Segment Segment assets Investments Acquisition of non-current Segment In millions of won Transmission and distribution ￦ 109,809,254 3,716,931 6,340,593 58,350,681 Electric power generation (Nuclear) 59,562,190 59,081 2,574,358 33,909,152 Electric power generation (Non-nuclear) 54,758,933 2,088,581 4,955,784 33,117,193 Plant maintenance & engineering service 3,528,879 50,238 95,810 1,124,855 Others 7,833,516 — 344,795 3,531,496 Segment totals 235,492,772 5,914,831 14,311,340 130,033,377 Consolidation adjustments: Elimination of inter-segment amounts (39,207,636 ) — (81,555 ) (6,654,717 ) Equity method adjustment 1,791,844 — — — Deferred taxes 2,048 — — 5,329,158 Others (481,236 ) — — 325 (37,894,980 ) — (81,555 ) (1,325,234 ) Consolidated totals ￦ 197,597,792 5,914,831 14,229,785 128,708,143 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
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 Geographical unit Revenue from external customers Non-current 2018 2019 2020 2018 2019 2020 In millions of won Domestic ￦ 57,799,991 56,942,128 56,774,577 157,037,428 169,366,365 173,673,478 Overseas(*1) 2,233,071 1,625,954 1,151,260 3,299,346 2,743,755 2,831,925 ￦ 60,033,062 58,568,082 57,925,837 160,336,774 172,110,120 176,505,403 (*1) Middle East and other Asian countries make up the majority of overseas revenue and non-current non-current (*2) The amounts exclude financial assets and deferred tax assets.
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, 2018, 2019 and 2020.

Classification of Financial I_2

Classification of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2020
Classification of Financial Instruments [Abstract]
Classification of financial assets	Classification of financial assets as of December 31, 2019 and 2020 are as follows: 2019 Financial assets Financial assets Financial assets Derivative assets Total In millions of won Current assets Cash and cash equivalents ￦ — — 1,810,129 — 1,810,129 Current financial assets Current financial assets at fair value through profit or loss 131,385 — — — 131,385 Current financial assets at amortized costs — — 12,302 — 12,302 Current derivative assets 21 — — 27,597 27,618 Other financial assets — — 1,415,204 — 1,415,204 Trade and other receivables — — 7,701,452 — 7,701,452 131,406 — 10,939,087 27,597 11,098,090 Non-current Non-current Non-current 615,876 — — — 615,876 Non-current — 379,170 — — 379,170 Non-current — — 1,307 — 1,307 Non-current 165,183 — — 118,232 283,415 Other financial assets — — 1,283,730 — 1,283,730 Trade and other receivables — — 2,002,297 — 2,002,297 781,059 379,170 3,287,334 118,232 4,565,795 ￦ 912,465 379,170 14,226,421 145,829 15,663,885 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 Non-current Non-current 685,281 — — — 685,281 Non-current — 358,559 — — 358,559 Non-current — — 1,273 — 1,273 Non-current 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
Classification of financial liabilities	Classification of financial liabilities as of December 31, 2019 and 2020 are as follows: 2019 Financial liabilities at fair value through profit or loss Financial liabilities Derivative liabilities Total In millions of won Current liabilities Borrowings ￦ — 1,315,134 — 1,315,134 Debt securities — 7,542,705 — 7,542,705 Derivative liabilities 13,286 — 59,778 73,064 Trade and other payables — 6,649,402 — 6,649,402 13,286 15,507,241 59,778 15,580,305 Non-current Borrowings — 3,389,743 — 3,389,743 Debt securities — 55,628,959 — 55,628,959 Derivative liabilities 39,861 — 57,035 96,896 Trade and other payables — 6,965,760 — 6,965,760 39,861 65,984,462 57,035 66,081,358 ￦ 53,147 81,491,703 116,813 81,661,663 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 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
Classification of comprehensive income (loss) from financial instruments	Classification of comprehensive income (loss) from financial instruments for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Cash and cash equivalents Interest income ￦ 40,704 42,861 9,419 Financial assets at fair value through profit or loss Interest income 21,713 29,411 19,114 Gain on valuation of derivatives 34,117 151,604 (52,447 ) Gain on transaction of derivatives 39,114 63,329 36,563 Gain on valuation of financial assets 1,879 1,062 5,508 Gain on disposal of financial assets 1,837 1,760 11,344 Financial assets at fair value through other comprehensive income Dividends income 12,777 13,838 7,316 Financial assets at amortized cost Interest income 89 539 612 Loans Interest income 21,925 63,448 26,232 Trade and other receivables Interest income 90,390 69,941 151,035 Short-term financial instruments Interest income 41,025 49,070 25,540 Long-term financial instruments Interest income 7,920 12,794 10,406 Other financial assets Interest income 1 54 228 Derivative assets (applying hedge accounting) Gain (loss) on valuation of derivatives (profit or loss) 69,799 123,730 (77,733 ) Gain on valuation of derivatives (equity, before tax) 8,600 38,305 9,925 Gain on transaction of derivatives 34,152 65,651 36,053 Financial liabilities at fair value through profit or loss Gain (loss) on valuation of derivatives (4,650 ) 27,686 (104,607 ) Gain on transaction of derivatives 36,046 (493 ) (49,788 ) Financial liabilities carried at amortized cost Interest expense of borrowings and debt securities 1,320,516 1,394,328 1,365,801 Gain (loss) on repayment of financial liabilities — — (35 ) Interest expense of trade and other payables 42,830 94,019 88,757 Interest expense of others 505,112 558,464 540,867 Gain (loss) on foreign currency transactions and translations (356,159 ) (406,175 ) 739,244 Derivative liabilities (applying hedge accounting) Gain (loss) on valuation of derivatives (profit or loss) 53,937 14,330 (220,928 ) Gain (loss) on valuation of derivatives (equity, before tax) (15,029 ) (2,578 ) 101,295 Gain (loss) on transaction of derivatives 37,985 (42,072 ) 42,565

Restricted Deposits (Tables)

Restricted Deposits (Tables)	12 Months Ended
	Dec. 31, 2020
Restricted Deposits [Abstract]
Restricted Deposits	Restricted deposits as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Cash and cash equivalents Escrow accounts ￦ — 544 Deposits for government project and others 9,287 5,066 Collateral provided for borrowings 63,198 117,747 Collateral provided for lawsuit 3 42 Deposits for transmission regional support program 3,002 5,469 Short-term financial instruments Restriction on withdrawal related to ‘win-win 93,000 109,000 Non-current Decommissioning costs of nuclear power plants 541,969 577,481 Long-term financial instruments Escrow accounts 74 76 Guarantee deposits for banking accounts at oversea branches 326 306 Collateral provided for borrowings 11,745 11,745 Decommissioning costs of nuclear power plants 250,464 258,282 Funds for developing small and medium enterprises(*) 200,000 210,000 ￦ 1,173,068 1,295,758 (*) Deposits for small and medium enterprise at the Industrial Bank of Korea (IBK) and others for construction of Bitgaram Energy Valley and support for high potential businesses as of December 31, 2019 and 2020.

Cash and Cash Equivalents (Tabl

Cash and Cash Equivalents (Tables)	12 Months Ended
	Dec. 31, 2020
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	Cash and cash equivalents as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Cash ￦ 266 871 Other demand deposits 1,117,499 1,291,058 Short-term deposits classified as cash equivalents 527,235 432,263 Short-term investments classified as cash equivalents 165,129 305,392 ￦ 1,810,129 2,029,584

Trade and Other Receivables (Ta

Trade and Other Receivables (Tables)	12 Months Ended
	Dec. 31, 2020
Trade and Other Receivables [Abstract]
Trade and Other Receivables	Trade and other receivables as of December 31, 2019 and 2020 are as follows: 2019 Gross Allowance for doubtful accounts Present value discount Book In millions of won Current assets Trade receivables ￦ 7,147,683 (208,505 ) — 6,939,178 Other receivables 792,147 (27,579 ) (2,294 ) 762,274 7,939,830 (236,084 ) (2,294 ) 7,701,452 Non-current Trade receivables 338,261 (4,254 ) (382 ) 333,625 Other receivables 1,759,930 (86,576 ) (4,682 ) 1,668,672 2,098,191 (90,830 ) (5,064 ) 2,002,297 ￦ 10,038,021 (326,914 ) (7,358 ) 9,703,749 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 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
Other receivables	Other receivables as of December 31, 2019 and 2020 are as follows: 2019 Gross Allowance for doubtful accounts Present value Book In millions of won Current assets Non-trade ￦ 376,438 (27,201 ) — 349,237 Accrued income 68,921 — — 68,921 Deposits 273,887 — (2,294 ) 271,593 Finance lease receivables(*1) 60,304 (378 ) — 59,926 Others 12,597 — — 12,597 792,147 (27,579 ) (2,294 ) 762,274 Non-current Non-trade 196,821 (78,654 ) — 118,167 Accrued income 2,222 — — 2,222 Deposits 338,989 — (4,682 ) 334,307 Finance lease receivables(*2) 1,118,537 (484 ) — 1,118,053 Others 103,361 (7,438 ) — 95,923 1,759,930 (86,576 ) (4,682 ) 1,668,672 ￦ 2,552,077 (114,155 ) (6,976 ) 2,430,946 (*1) Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of ￦ 112,789 million. (*2) Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of ￦ 1,218,934 million. 2020 Gross Allowance for doubtful accounts Present value Book In millions of won Current assets Non-trade ￦ 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 Non-trade 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.
Aging analysis of trade receivables	Aging analysis of trade receivables as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Trade receivables: (not overdue) ￦ 7,338,757 7,274,773 Trade receivables: (impairment reviewed) 147,187 323,411 Less than 60 days 6,555 3,505 60 ~ 90 days 1,899 28,729 90 ~ 120 days 2,106 10,687 120 days ~ 1 year 37,357 34,036 Over 1 year 99,270 246,454 7,485,944 7,598,184 Less: allowance for doubtful accounts (212,759 ) (208,990 ) Less: present value discount (382 ) — ￦ 7,272,803 7,389,194
Aging analysis of other receivables	Aging analysis of other receivables as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Other receivables: (not overdue) ￦ 2,327,640 2,363,967 Other receivables: (impairment reviewed) 224,437 164,117 Less than 60 days 98,220 46,399 60 ~ 90 days 2,034 31,183 90 ~ 120 days 14,135 1,873 120 days ~ 1 year 26,212 11,803 Over 1 year 83,836 72,859 2,552,077 2,528,084 Less: allowance for doubtful accounts (114,155 ) (132,379 ) Less: present value discount (6,976 ) (4,860 ) ￦ 2,430,946 2,390,845
Changes in the allowance for doubtful accounts	Changes in the allowance for doubtful accounts for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 Trade Other Trade Other Trade Other In millions of won Beginning balance ￦ 173,583 78,008 215,868 104,726 212,759 114,155 Effect of change in accounting policy 6,641 128 — — — — Loss allowance as at January 1 under IFRS 9 180,224 78,136 215,868 104,726 212,759 114,155 Bad debt expense 41,498 17,817 29,221 19,206 24,021 27,329 Write-off (7,696 ) (244 ) (10,106 ) (1,146 ) (20,332 ) (1,910 ) Reversal (1,726 ) (143 ) (41,940 ) — (3,373 ) (2,464 ) Others 3,568 9,160 19,716 (8,631 ) (4,085 ) (4,731 ) Ending balance ￦ 215,868 104,726 212,759 114,155 208,990 132,379

Financial Assets at Fair Valu_3

Financial Assets at Fair Value through Profit or Loss (Tables)	12 Months Ended
	Dec. 31, 2020
Financial assets at fair value through profit or loss [Abstract]
Financial Assets at Fair Value through Profit or Loss	Financial assets at fair value through profit or loss as of December 31, 2019 and 2020 are as follows: 2019 2020 Current Non-current Current Non-current In millions of won Financial assets at fair value through profit or loss Beneficiary Certificate ￦ 894 160,952 1,313 155,122 Cooperative — 5,155 — 5,692 Other(*) 130,491 244,857 1,194,788 312,401 131,385 410,964 1,196,101 473,215 Financial assets designated as at fair value through profit or loss Debt with embedded derivatives — 150,916 — 212,066 Other — 53,996 — — — 204,912 — 212,066 ￦ 131,385 615,876 1,196,101 685,281 (*) ‘Other’ includes MMT, etc.
Gains (losses) on financial assets at fair value through profit or loss	Details of income (loss) from financial assets at fair value through profit or loss for the years ended December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Beneficiary Certificate ￦ 12,458 6,127 Cooperative 76 645 Debt with embedded derivatives 2,697 3,598 Other 17,002 30,329 ￦ 32,233 40,699

Financial Assets at Fair Valu_4

Financial Assets at Fair Value through Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2020
Financial assets at fair value through other comprehensive income [Abstract]
Changes in financial assets at fair value through other comprehensive income	Changes in financial assets at fair value through other comprehensive income for the years ended December 31, 2019 and 2020 are as follows: 2019 Beginning Acquisition Disposal Valuation Others Ending In millions of won Listed ￦ 210,055 — — (11,734 ) 2,880 201,201 Unlisted 189,439 1,876 (19,315 ) 3,715 2,254 177,969 399,494 1,876 (19,315 ) (8,019 ) 5,134 379,170 Current financial assets at fair value through other comprehensive income ￦ — — — — — — Non-current 399,494 1,876 (19,315 ) (8,019 ) 5,134 379,170 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 379,170 2,900 (5 ) (30,937 ) 7,431 358,559
Financial Assets at Fair Value through Other Comprehensive Income	Financial assets at fair value through other comprehensive income as of December 31, 2019 and 2020 are as follows: 2019 Shares Ownership Acquisition Book value Fair value In millions of won Listed Korea District Heating Corp. 2,264,068 19.55 % ￦ 173,201 107,090 107,090 Ssangyong Motor Co., Ltd. 38,568 0.03 % 428 80 80 SM Korea Line Corp. 18 0.00 % 1 — — Namkwang Engineering & Construction Co., Ltd. 121 0.00 % 15 1 1 Bumyang Construction Co., Ltd. 35 0.00 % 2 — — Elcomtec Co., Ltd. 32,875 0.04 % 217 52 52 Pan Ocean Co., Ltd. 1,492 0.00 % 14 7 7 Dongbu Corp. 955 0.00 % 12 8 8 KSP Co., Ltd. 22,539 0.06 % 24 40 40 STX Heavy Industries Co., Ltd. 8,639 0.03 % 213 26 26 Codes Combine Co., Ltd. 291 0.00 % 1 1 1 PT Adaro Energy Tbk 480,000,000 1.50 % 65,028 62,026 62,026 Energy Fuels Inc. 1,711,814 1.91 % 16,819 3,764 3,764 Bunji Corporation Limited 99,763 0.07 % 18,445 — — Denison Mines Corp. 58,284,000 10.42 % 84,134 27,903 27,903 Fission 3.0 75,000 0.14 % — 5 5 Fission Uranium Corp. 800,000 0.16 % 785 199 199 359,339 201,202 201,202 Unlisted Intellectual Discovery Co., Ltd. 1,000,000 6.00 % ￦ 5,000 954 954 Hwan Young Steel Co., Ltd. 10,916 0.14 % 1,092 97 97 Sambo Auto . Co., Ltd. 15,066 0.02 % 38 38 38 Mobo Co., Ltd. 504 0.00 % 14 14 14 Dae Kwang Semiconductor Co., Ltd. 589 0.07 % 6 6 6 Sanbon Department Store 828 0.01 % 124 3 3 Miju Steel Mfg. Co., Ltd. 1,097 0.23 % 50 50 50 Sungwon Co., Ltd. 117 0.07 % 15 15 15 Hana Civil Engineering Co., Ltd. 23 0.00 % 1 1 1 KC Development Co., Ltd. 839 0.02 % 6 6 6 Imhwa Corp. 329 0.11 % 5 5 5 Dalim Special Vehicle Co., Ltd. 58 0.08 % 10 10 10 ASA Jeonju Co., Ltd. 34,846 1.34 % 697 69 69 Moonkyung Silica Co., Ltd. 42 0.56 % — — — Sungkwang Timber Co., Ltd. 3 0.08 % 5 5 5 Yongbo Co., Ltd. 61 0.20 % 3 3 3 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 2019 Shares Ownership Acquisition Book value Fair value In millions of won MSE Co., Ltd. 429 0.13 % ￦ 9 9 9 Ilrim Nano Tec Co., Ltd. 1,520 0.07 % 15 15 15 Youngjin Hi-Tech 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 11 11 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 Seungri Enterprise Co., Ltd. 93 0.05 % 3 3 3 Onggane Food Co., Ltd 5 0.07 % 1 1 1 Shin-E 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 % 27 27 27 Yuil Industrial Electronics Co., Ltd. 804 0.32 % 16 16 16 DN Tek Inc. 12,401 0.29 % 62 6 6 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 % 147 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 2019 Shares Ownership Acquisition Book value Fair value In millions of won Yoo-A 105 0.20 % ￦ 11 11 11 Dung Hwan Co., Ltd. 531 0.02 % 5 5 5 Hurim Biocell Co., Ltd. 1,021 0.00 % 5 5 5 Smart Power Co., Ltd. 133,333 4.14 % 200 200 200 Sunjin Power Tech Co., Ltd. 4,941 0.92 % 247 32 32 Haseung Industries Co.,Ltd. 55 0.62 % 28 28 28 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 % 23 23 23 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 % 135 1 1 HyoDong Development Co., Ltd. 128 0.15 % 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 Dong Yang Metal Co., Ltd. 2,951 1.97 % 161 148 148 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 % 11 3 3 Borneo International Furniture Co., Ltd. 4,000 0.16 % 97 13 13 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 Echoroba Co.,Ltd. 157 0.02 % 3 3 3 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 2019 Shares Ownership Acquisition Book value Fair value In millions of won 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. 64 0.07 % 4 4 4 Possbell Engineering Co., Ltd. 36 0.64 % 1 1 1 Airtech Information communication Co., Ltd 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 % 229,255 166,863 166,863 PT. Cirebon Energi Prasarana 22,420 10.00 % 2,612 2,596 2,596 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 KMT Co., Ltd. 1,411 0.93 % 21 21 21 TheYeonriji Co., Ltd. 116 0.10 % 6 6 6 Flusys Co., Ltd. 9 0.08 % 2 2 2 DongSeo Electronics Co., Ltd. 323 0.07 % 16 16 16 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 AID Co., Ltd. 1,212 0.57 % 36 36 36 Changwon Eco-friendly 3 0.01 % — — — Kumo Hitech Co., Ltd. 6,697 0.53 % 100 100 100 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 22 0.39 % 22 22 22 Keum Mun Industry Co., Ltd. 1,320 0.97 % 330 56 56 2019 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 SIE Co., Ltd. 12 0.02 % 1 1 1 Sejin Hightech Co., Ltd. 17,980 0.16 % 18 18 18 Namcheong Corp. 7,096 0.28 % 284 11 11 Eun Sung Enterprise Co. 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 Bugook Cast Iron Co. 135 0.71 % 14 14 14 Ilwoo Steel Co., Ltd. 41 0.28 % 17 17 17 Dong-un 1,159 6.28 % 81 81 81 Wongwang Door Corp. 575 1.00 % 29 29 29 Seobu Highway Solar Co., Ltd. 19,460 10.00 % 192 192 192 Dongbu Highway Solar Co., Ltd. 19,020 4.99 % 192 192 192 Muan sunshine solar power plant 298,300 19.00 % 1,492 1,492 1,492 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 DMC Co., Ltd. 5,831 0.02 % 38 38 38 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 % 9 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 Millenium Co., Ltd. 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 Shinhan Sangi Co., Ltd. 29 0.20 % 4 4 4 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 2019 Shares Ownership Acquisition Book value Fair value In millions of won Shinwonn Toptech Co., Ltd. 834 0.51 % ￦ 83 83 83 KMLC Co., Ltd. 281 0.14 % 22 22 22 Seinfood Co., Ltd. 13 0.17 % 7 7 7 TaeSung Eco-Tech. 1,368 4.55 % 34 34 34 Kukex Inc. 639 0.05 % 3 3 3 Youngshin Plu Co., Ltd. 104 0.12 % 5 5 5 Chang won Engineering Co., Ltd. 22 0.00 % 4 4 4 Samsung Silup Co., Ltd. 47 0.19 % 5 5 5 Samwon Bio Tech Co., Ltd. 390 0.25 % 6 6 6 Izu Korea Co., Ltd. 48 0.00 % 2 2 2 Dongdo CNP Co., Ltd. 234 0.36 % 6 6 6 Hando Precision Co.,Ltd 38 0.26 % 4 4 4 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 0.09 % 141 141 141 TCT Co., Ltd. 3,277 0.55 % 82 82 82 E-Won 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 0.00 % 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 Dong Hwan Co., Ltd. 25 0.02 % 1 1 1 266,717 177,968 177,968 ￦ 626,056 379,170 379,170 (*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 for the year ended December 31, 2019. 2020 Shares Ownership Acquisition 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 Co., Ltd. 32,875 0.04 % 217 49 49 Pan Ocean Co., Ltd. 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 Co., Ltd. 15,066 0.02 % 38 38 38 Mobo Co., Ltd. 504 0.00 % 14 14 14 Dae Kwang Semiconductor Co., Ltd. 589 0.07 % 6 6 6 Sanbon Department Store 828 0.01 % 124 3 3 Miju Steel Mfg. Co., Ltd. 1,097 0.23 % 50 50 50 Sungwon Co., Ltd. 117 0.07 % 15 15 15 KC Development Co., Ltd. 839 0.02 % 6 6 6 Imhwa Corp. 329 0.11 % 5 5 5 Dalim Special Vehicle Co., Ltd. 58 0.08 % 10 10 10 ASA Jeonju Co., Ltd. 34,846 1.34 % 697 69 69 Moonkyung Silica Co., Ltd. 42 0.56 % — — — 2020 Shares Ownership Acquisition Book value Fair value In millions of won 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 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 Seungri Enterprise Co., Ltd. 93 0.05 % 3 3 3 Shin-E 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 2020 Shares Ownership Acquisition Book value Fair value In millions of won 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 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 2020 Shares Ownership Acquisition Book value Fair value In millions of won 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 Information communication Co., Ltd 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 AID Co., Ltd. 1,212 0.57 % 36 36 36 Changwon Eco-friendly 3 0.01 % — — — Kumo Hitech Co., Ltd. 6,697 0.53 % 100 100 100 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 2020 Shares Ownership Acquisition Book value Fair value In millions of won KJ Alloy Co., Ltd. 368 0.20 % ￦ 7 7 7 SM Hi-tech 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 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 Millenium Co., Ltd. 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 2020 Shares Ownership Acquisition Book value Fair value In millions of won KMLC Co., Ltd. 281 0.14 % ￦ 22 22 22 Seinfood Co., Ltd. 13 0.17 % 7 7 7 TaeSung Eco-Tech. 1,368 4.55 % 34 34 34 Kukex Inc. 639 0.05 % 3 3 3 Youngshin Plus Co., Ltd. 104 0.12 % 5 5 5 Chang won Engineering Co., Ltd. 22 0.00 % 4 4 4 Samsung Silup Co., Ltd. 47 0.19 % 5 5 5 Samwon Bio Tech Co., Ltd. 390 0.25 % 6 6 6 Izu Korea Co., Ltd. 48 0.00 % 2 2 2 Dongdo CNP Co., Ltd. 234 0.36 % 6 6 6 Dae Bang Industry Co.,Ltd. 115 0.13 % 6 6 6 S.I.T. Co.,Ltd 2,213 0.44 % 22 22 22 Taejin Hiech Co., Ltd. 78 0.26 % 3 3 3 Headone Co.,Ltd. 69 0.12 % 7 7 7 Enaindustry Co., Ltd. 201 0.28 % 141 141 141 TCT Co., Ltd. 3,277 0.55 % 82 82 82 E-Won 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 % — — — WorldCnM Inc. 131 1.09 % 10 10 10 Superone Co., Ltd. 1,585 1.45 % 8 8 8 Deok-u 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 2020 Shares Ownership Acquisition Book value Fair value In millions of won 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 Co., Ltd. 8 0.02 % 1 1 1 Ajin KSB Co., Ltd. 204 0.31 % 18 18 18 Sewon Ceramic Co., Ltd. 530 1.01 % 5 5 5 Choyang Tech Co., Ltd. 465 1.01 % 23 23 23 TK Co., Ltd. 307 0.70 % 15 15 15 Sungdo Co., Ltd. 130 1.10 % 52 52 52 KSM Tech 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 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 38 0.02 % 1 1 1 2020 Shares Ownership Acquisition Book value Fair value In millions of won 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 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 for the year ended December 31, 2020.

Financial Assets at Amortized_2

Financial Assets at Amortized Cost (Tables)	12 Months Ended
	Dec. 31, 2020
Financial Assets at Amortized Cost [Abstract]
Financial Assets at Amortized Cost	Financial assets at amortized cost as of December 31, 2019 and 2020 are as follows: 2019 Financial assets at amortized cost Government grants Allowance for doubtful accounts Others Book value In millions of won Government bonds ￦ 1,609 — — — 1,609 Others 12,000 — — — 12,000 ￦ 13,609 — — — 13,609 Current ￦ 12,302 — — — 12,302 Non-current 1,307 — — — 1,307 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

Derivatives (Tables)

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2020
Derivatives [Abstract]
Derivatives	Derivatives as of December 31, 2019 and 2020 are as follows: 2019 2020 Current Non-current Current Non-current In millions of won Derivative assets Currency forward ￦ 21 43,931 18,332 — Currency swap 27,597 229,258 11,193 127,386 —Trading — 111,026 — 82,931 —Hedging 27,597 118,232 11,193 44,455 Interest rate swap — 7,592 — 9,502 —Trading — 7,592 — 9502 —Hedging — — — — Others — 2,634 — — ￦ 27,618 283,415 29,525 136,888 Derivative liabilities Currency forward ￦ 7,081 — 10,014 4,977 Currency swap 59,327 45,184 36,088 232,669 —Trading — 13,250 — 93,245 —Hedging 59,327 31,933 36,088 139,424 Interest rate swap 451 50,756 3,782 66,451 —Trading — 26,610 2,192 22,687 —Hedging 451 24,147 1,590 43,764 Others(*1,2,3) 6,205 956 — 11,138 ￦ 73,064 96,896 49,884 315,235 (*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	Currency forward contracts which are not designated as hedging instruments as of December 31, 2020 are as follows: Contract date 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 Hana Bank 2014.04.10 2021.07.12 ￦ 55,120 USD 52,000 ￦ 1,060.00 Hana Bank 2014.04.28 2021.07.12 50,784 USD 48,000 1,058.00 Bank of America 2014.04.29 2021.07.12 105,400 USD 100,000 1,054.00 Hana Bank 2014.05.09 2021.07.12 104,600 USD 100,000 1,046.00 Hana Bank 2017.12.22 2021.07.12 ￦ 105,079 USD 100,000 ￦ 1,050.79 Korea Development Bank 2017.12.27 2021.07.12 104,849 USD 100,000 1,048.49 Shinhan Bank 2020.11.25 2021.01.29 895 USD 809 1,106.50 Woori Bank 2020.12.28 2021.01.28 53,371 USD 48,790 1,093.88 Shinhan Bank 2020.12.29 2021.01.25 27,776 USD 25,379 1,094.44 Shinhan Bank 2020.10.08 2021.01.04 7,836 USD 6,771 1,157.15 Shinhan Bank 2020.10.08 2021.01.05 7,586 USD 6,552 1,157.75 Shinhan Bank 2020.10.19 2021.01.18 10,498 USD 9,188 1,142.68 Shinhan Bank 2020.10.21 2021.01.19 7,633 USD 6,717 1,136.45 Shinhan Bank 2020.11.05 2021.02.02 6,471 USD 5,729 1,129.45 CCB 2020.11.30 2021.01.05 5,522 USD 5,000 1,104.45 Standard Chartered 2020.12.09 2021.01.14 3,248 USD 3,000 1,082.80 Mizuho Bank 2020.12.14 2021.01.20 2,180 USD 2,000 1,090.05 Hana Bank 2020.12.17 2021.01.25 5,456 USD 5,000 1,091.25 Korea Development Bank 2020.12.18 2021.01.28 5,469 USD 5,000 1,093.75 Woori Bank 2020.12.23 2021.02.02 5,540 USD 5,000 1,107.95 Hana Bank 2020.12.24 2021.02.08 3,303 USD 3,000 1,101.10 Morgan Stanley 2020.12.24 2021.02.09 5,504 USD 5,000 1,100.80 Standard Chartered 2020.12.28 2021.02.10 3,296 USD 3,000 1,098.50 Credit Agricole 2020.12.28 2021.02.15 3,284 USD 3,000 1,094.55 Nonghyup Bank 2020.12.29 2021.02.17 6,572 USD 6,000 1,095.30 Korea Development Bank 2020.12.30 2021.02.19 5,436 USD 5,000 1,087.16 Korea Development Bank 2020.12.15 2021.01.05 1,092 USD 1,000 1,092.10 HSBC 2020.12.23 2021.01.05 3,881 USD 3,500 1,108.85 HSBC 2020.12.24 2021.01.05 3,306 USD 3,000 1,101.95 HSBC 2020.12.24 2021.01.22 1,651 USD 1,500 1,100.80 HSBC 2020.12.29 2021.01.13 14,210 USD 13,000 1,093.10 Korea Development Bank 2020.12.29 2021.01.05 6,791 USD 6,200 1,095.35 Shinhan Bank 2020.12.30 2021.01.22 9,249 USD 8,500 1,088.10 MUFG 2020.12.29 2021.01.12 4,380 USD 4,000 1,095.05 BNP Paribas 2020.12.30 2021.01.19 4,351 USD 4,000 1,087.80 Nova Scotia 2020.09.18 2021.01.12 46,700 USD 40,000 1,167.50 Mizuho Bank 2020.09.18 2021.03.11 15,177 USD 13,000 1,167.45 HSBC 2020.09.18 2021.06.11 31,506 USD 27,000 1,166.90 HSBC 2020.10.19 2024.10.29 140,913 USD 125,000 1,127.30 Woori Bank 2020.12.03 2021.01.08 1,461 USD 1,330 1,098.70 Shinhan Bank 2020.12.04 2021.01.08 9,775 USD 9,000 1,086.15 Credit Agricole 2020.12.10 2021.01.08 3,915 USD 3,600 1,087.45 Standard Chartered 2020.12.17 2021.01.15 4,044 USD 3,700 1,093.10 Hana Bank 2020.12.23 2021.01.21 3,321 USD 3,000 1,107.15 Hana Bank 2020.12.24 2021.01.21 5,504 USD 5,000 1,100.70 Woori Bank 2020.12.28 2021.01.04 ￦ 19,076 USD 17,400 ￦ 1,096.30 Standard Chartered 2020.12.28 2021.01.15 6,577 USD 6,000 1,096.20 Shinhan Bank 2020.12.28 2021.01.29 9,870 USD 9,000 1,096.70 Credit Agricole 2020.12.30 2021.01.29 4,915 USD 4,500 1,092.30 Standard Chartered 2020.12.30 2021.01.29 4,344 USD 4,000 1,086.00 Woori Bank 2020.12.30 2021.02.05 8,691 USD 8,000 1,086.40
Currency swap contracts which are not designated as hedge instruments	Currency swap contracts which are not designated as hedging instruments as of December 31, 2020 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 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 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 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	Currency swap contracts which are designated as hedging instruments as of December 31, 2020 are as follows: Counterparty Contract 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 Korea Development Bank 2016~2021 121,000 USD 100,000 2.15% 2.50% 1,210.00 Morgan Stanley 2016~2021 121,000 USD 100,000 3M Libor + 2.10% 2.50% 1,210.00 BNP Paribas 2016~2021 121,000 USD 100,000 3M Libor + 2.10% 2.50% 1,210.00 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 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 Hana Bank 2018~2021 212,960 USD 200,000 2.10% 3.00% 1,064.80 Korea Development Bank 2018~2021 212,960 USD 200,000 2.10% 3.00% 1,064.80 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	Interest rate swap contracts which are not designated as hedging instruments as of December 31, 2020 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% Hana Bank 2017~2021 200,000 2.45% 3M CD + 0.32% Nomura(*) 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% 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% (*) 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.
Interest rate swap contracts which are designated as hedge instruments	Interest rate swap contracts which are designated as hedging instruments as of December 31, 2020 are as follows: Counterparty Contract Contract amount Contract interest rate per annum Pay Receive In thousands Export-Import Bankof 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 69,509 4.16% 6M USD Libor KFW 2009~2027 USD 69,509 4.16% 6M USD Libor Export-Import Bankof Korea 2016~2036 USD 75,929 3.00% 6M USD Libor
Gain and loss on valuation and transaction of derivatives	Gain and loss on valuation and transaction of derivatives for the years ended December 31, 2018, 2019 and 2020 are as follows and included in finance income and expenses in the consolidated statements of comprehensive income (loss): Net income effects of valuation gain (loss) Net income effects of transaction gain (loss) Other comprehensive income (loss)(*) 2018 2019 2020 2018 2019 2020 2018 2019 2020 In millions of won Currency forward ￦ 12,632 24,265 (40,590 ) 23,991 12,488 (17,911 ) — — — Currency swap 145,088 310,732 (406,607 ) 123,670 110,813 93,557 (12,516 ) 38,802 105,642 - Trading 21,702 172,087 (108,090 ) 51,533 52,842 16,661 — — — - Hedging 123,386 138,645 (298,517 ) 72,137 57,971 76,896 (12,516 ) 38,802 105,642 Interest rate swap (2,949 ) (16,231 ) (1,845 ) (364 ) (36,886 ) (10,253 ) 6,087 (3,075 ) 5,578 - Trading (2,949 ) (15,647 ) (309 ) (364 ) (2,495 ) (11,975 ) — — —, - Hedging — (584 ) (1,536 ) — (34,391 ) 1,722 6,087 (3,075 ) 5,578 Other derivatives (1,568 ) (1,416 ) (6,673 ) — — — — — — ￦ 153,203 317,350 (455,715) 147,297 86,415 65,393 (6,429) 35,727 111,220 (*) For the year ended December 31, 2020, the net gain on valuation of derivatives designated as cash flow hedge of ￦64,561 million, net of tax, is included in other comprehensive income (loss).

Other Financial Assets (Tables)

Other Financial Assets (Tables)	12 Months Ended
	Dec. 31, 2020
Other Financial Assets [Abstract]
Other Financial Assets	Other financial assets as of December 31, 2019 and 2020 are as follows: 2019 2020 Current Non-current Current Non-current In millions of won Loans ￦ 64,111 725,755 78,806 762,555 Less: Allowance for doubtful accounts (31 ) (15,063 ) (1 ) (20,266 ) Less: Present value discount (847 ) (35,218 ) (842 ) (30,090 ) Long-term / short-term financial instruments 1,351,971 608,256 1,483,482 578,621 ￦ 1,415,204 1,283,730 1,561,445 1,290,820
Loans and receivables	Loans as of December 31, 2019 and 2020 are as follows: 2019 Face value Allowance for Present value discount Carrying value In millions of won Short-term loans Loans for tuition ￦ 33,636 — (847 ) 32,789 Loans for housing 17,113 — — 17,113 Other loans 13,362 (31 ) — 13,331 64,111 (31 ) (847 ) 63,233 2019 Face value Allowance for Present value discount Carrying value In millions of won Long-term loans Loans for tuition ￦ 419,905 — (35,197 ) 384,708 Loans for housing 199,454 — — 199,454 Loans for related parties 89,132 (4,930 ) — 84,202 Other loans 17,264 (10,133 ) (21 ) 7,110 725,755 (15,063 ) (35,218 ) 675,474 ￦ 789,866 (15,094 ) (36,065 ) 738,707 2020 Face value Allowance for Present value discount 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
Changes in the allowance for doubtful accounts of loans and receivables	Changes in the allowance for doubtful accounts of loans for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Beginning balance ￦ 8,948 4,952 15,094 Bad debt expense 22 10,142 5,173 Other (4,018 ) — — Ending balance ￦ 4,952 15,094 20,267
Long-term and short-term financial instruments	Long-term and short-term financial instruments as of December 31, 2019 and 2020 are as follows: 2019 2020 Current Non-current Current Non-current In millions of won Time deposits ￦ 1,034,971 257,857 996,265 160,433 CP 40,000 — — — CD 15,000 — 50,000 — RP 40,000 — 203,008 — Others 222,000 350,399 234,209 418,188 ￦ 1,351,971 608,256 1,483,482 578,621

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2020
Inventories [Abstract]
Inventories	Inventories as of December 31, 2019 and 2020 are as follows: 2019 Acquisition cost Valuation allowance Book value In millions of won Raw materials ￦ 3,790,443 (1,430 ) 3,789,013 Merchandises 340 — 340 Work-in-progress 165,073 — 165,073 Finished goods 58,280 — 58,280 Supplies 2,121,363 (4,369 ) 2,116,994 Inventories-in-transit 906,267 — 906,267 Other inventories 14,733 — 14,733 ￦ 7,056,499 (5,799 ) 7,050,700 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 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, 2018, 2019 and 2020 were ￦3,723 million , ￦4,872 million and ￦2,020 million, respectively. The amounts of loss from inventory valuation included in other gains or losses for the years ended December 31, 2018, 2019 and 2020 were ￦1,953 million, ￦3,127 million and ￦4,998 million, respectively.

Non-Financial Assets (Tables)

Non-Financial Assets (Tables)	12 Months Ended
	Dec. 31, 2020
Non-Financial Assets [Abstract]
Non-Financial Assets	Non-financial 2019 2020 Current Non-current Current Non-current In millions of won Advanced payments ￦ 147,784 2,694 169,737 32,693 Prepaid expenses 308,017 84,421 216,073 140,730 Others(*1) 750,576 79,814 634,348 72,969 ￦ 1,206,377 166,929 1,020,158 246,392 (*1) Details of others as of December 31, 2019 and 2020 are as follows: 2019 2020 Current Non-current Current Non-current In millions of won Greenhouse gasemissions rights ￦ 437,562 — 357,355 — Other quick assets(*2) 313,014 79,814 276,993 72,969 ￦ 750,576 79,814 634,348 72,969 (*2) The Company recognized an impairment loss of ￦49,201 million as it was determined that there is an objective evidence of impairment related to its rights to equity interest in Orano Expansion for the year ended December 31, 2019.

Consolidated Subsidiaries (Tabl

Consolidated Subsidiaries (Tables)	12 Months Ended
	Dec. 31, 2020
Consolidated Subsidiaries [Abstract]
Consolidated Subsidiaries	Consolidated subsidiaries as of December 31, 2019 and 2020 are as follows: Percentage of ownership (%) Subsidiaries Key operation activities Location 2019 2020 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 % 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 Philippines Corporation Holding company PHILIPPINES 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(*7) Power generation USA 100.00 % 100.00 % DG Whitefield, LLC Power generation USA 100.00 % — Springfield 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 % 100.00 % PT. EWP Indonesia Holding company INDONESIA 99.96 % 99.96 % KEPCO Netherlands J3 B.V. Holding company NETHERLANDS 100.00 % 100.00 % Korea Offshore Wind Power Co., Ltd. Power generation KOREA 100.00 % 100.00 % Global One Pioneer B.V. Holding company NETHERLANDS 100.00 % 100.00 % Global Energy Pioneer B.V. Holding company NETHERLANDS 100.00 % 100.00 % Mira Power Limited(*3) Power generation PAKISTAN 76.00 % 76.00 % KOSEP Material Co., Ltd. Recycling fly ashes KOREA 86.22 % 86.22 % Commerce and Industry Energy Co., Ltd.(*4) 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. Operation of utility plant KOREA 50.00 % 50.00 % VI Carbon Professional Private Special Asset Investment Trust 1 Holding company KOREA 96.67 % 96.67 % Chitose Solar Power Plant LLC Power generation JAPAN 80.10 % 80.10 % KEPCO Energy Solution Co., Ltd. Energy service KOREA 100.00 % 100.00 % KEPCO Solar Co., Ltd. (formerly, Solar School Plant 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 (formerly, KEPCO-LG Holding company USA 70.00 % 100.00 % Mangilao Investment LLC Holding company USA 100.00 % 100.00 % KEPCO Mangilao Solar, LLC (formerly, KEPCO-LG Power generation USA 100.00 % 100.00 % Jeju Hanlim Offshore Wind Co., Ltd. Power generation KOREA 75.99 % 75.99 % 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 % 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 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 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(*6) 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 Facility maintenance PAKISTAN 100.00 % 100.00 % KOMIPO Europe B.V. Holding company NETHERLANDS 100.00 % 100.00 % Haenanum Energy Fund Holding company KOREA 99.64 % 99.64 % Paju Ecoenergy Co., Ltd. Power generation KOREA 89.00 % 89.00 % Guam Ukudu Power LLC Power generation USA — 100.00 % TS Energy No. 25 Co., Ltd. Power generation KOREA — 90.00 % KPS Partners Co., Ltd. Facility maintenance and service KOREA — 100.00 % KEPCO E&C Service Co., Ltd. Facility maintenance and service KOREA — 100.00 % Moha Solar Co., Ltd. Power generation KOREA — 100.00 % Ogiri Solar Power Co., Ltd. Power generation KOREA — 70.00 % KHNP USA LLC Holding company USA — 100.00 % KOMIPO Vanphong Power Service LLC Utility plant maintenance and others VIETNAM — 100.00 % Energy Innovation Fund I Holding company KOREA — 71.91 % (*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 through the shareholders’ agreement. (*3) As of the reporting date, the annual reporting period of all subsidiaries is December 31, except for Mira Power Limited which is November 30. (*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) 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. (*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 the CEO and key management members. (*7) As 100% of the shares held were sold after the end of the reporting period, the assets of DG Fairhaven Power, LLC were classified as assets held-for-sale.
Subsidiaries newly included in or excluded from consolidation	Subsidiaries included in consolidation during the year ended December 31, 2020. Subsidiaries Reason Guam Ukudu Power LLC Newly established TS Energy No. 25 Co., Ltd. New investment KPS Partners Co., Ltd. Newly established KEPCO E&C Service Co., Ltd. Newly established Moha Solar Co., Ltd. New investment Ogiri Solar Power Co., Ltd. Newly established KHNP USA LLC Newly established KOMIPO Vanphong Power Service LLC Newly established Energy Innovation Fund I Additional acquisition BSK E-New Newly established Subsidiaries excluded from consolidation during the year ended December 31, 2020. Subsidiaries Reason EWP Philippines Corporation Liquidation DG Whitefield, LLC Sale of shares Springfield Power, LLC Sale of shares
Summary of financial information of consolidated subsidiaries	Summary of financial information of consolidated subsidiaries as of and for the years ended December 31, 2019 and 2020 are as follows: 2019 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won Korea Hydro & Nuclear Power Co., Ltd. ￦ 59,570,219 33,917,275 8,969,072 306,007 Korea South-East Power Co., Ltd. 10,938,358 5,866,642 5,385,387 41,006 Korea Midland Power Co., Ltd. 12,684,828 8,977,766 4,479,707 (28,449 ) Korea Western Power Co., Ltd. 10,514,438 6,637,451 4,448,992 (46,061 ) Korea Southern Power Co., Ltd. 10,884,799 6,608,301 5,084,907 (41,342 ) Korea East-West Power Co., Ltd. 9,724,311 5,022,921 4,855,964 56,698 KEPCO Engineering & Construction Company, Inc. 735,207 242,994 448,635 26,398 KEPCO Plant Service & Engineering Co., Ltd. 1,356,983 294,757 1,244,613 157,737 KEPCO Nuclear Fuel Co., Ltd. 831,604 429,799 309,055 24,618 KEPCO KDN Co., Ltd. 604,458 159,807 625,567 42,205 KEPCO International HongKong Ltd. 138,942 633 — 3,330 KEPCO International Philippines Inc. 107,224 371 — 67,991 KEPCO Gansu International Ltd. 10,448 545 — (20 ) KEPCO Philippines Holdings Inc. 200,503 6,656 — 66,200 KEPCO Philippines Corporation 6,706 332 — (52 ) KEPCO Ilijan Corporation 371,377 56,156 95,072 40,818 KEPCO Lebanon SARL 1,835 9,786 — 255 KEPCO Neimenggu International Ltd. 200,858 — — (354 ) KEPCO Shanxi International Ltd. 538,604 208,895 — 151 KOMIPO Global Pte Ltd. 269,302 463 — 10,400 KEPCO Netherlands B.V. 122,577 101 — 948 Korea Imouraren Uranium Investment Corp. 14,173 111 — (49,716 ) KEPCO Australia Pty., Ltd. 364 14 — (395,914 ) KOSEP Australia Pty., Ltd. 32,782 2,911 15,514 3,935 KOMIPO Australia Pty., Ltd. 40,898 2,909 15,514 3,766 KOWEPO Australia Pty., Ltd. 44,182 5,772 15,514 2,761 KOSPO Australia Pty., Ltd. 37,254 5,012 15,514 2,638 KEPCO Middle East Holding Company 102,164 87,834 — 5,934 Qatrana Electric Power Company 490,723 322,857 20,773 21,807 2019 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won KHNP Canada Energy, Ltd. ￦ 44,639 43 — (10 ) KEPCO Bylong Australia Pty., Ltd. 45,207 355,163 — (220,909 ) Korea Waterbury Uranium Limited Partnership 20,717 167 — (77 ) KEPCO Holdings de Mexico 187 25 — (14 ) KST Electric Power Company 539,952 449,459 55,783 (20,797 ) KEPCO Energy Service Company 2,262 1,995 5,984 (481 ) KEPCO Netherlands S3 B.V. 50,352 49 — 2,637 PT. KOMIPO Pembangkitan Jawa Bali 12,391 5,719 18,722 4,312 PT. Cirebon Power Service 2,089 313 8,049 406 KOWEPO International Corporation — 10 — (2 ) KOSPO Jordan LLC 17,489 1,521 10,878 2,634 EWP Philippines Corporation 1,691 888 — (111 ) EWP America Inc.(*1) 66,622 2,619 21,719 (6,497 ) KNF Canada Energy Limited 1,933 24 — (48 ) EWP Barbados 1 SRL 279,295 1,031 2,914 2,368 Gyeonggi Green Energy Co., Ltd. 194,425 159,078 13,717 (73,394 ) PT. Tanggamus Electric Power 228,601 195,826 2,256 (4,529 ) Gyeongju Wind Power Co., Ltd. 113,745 75,427 15,548 3,384 KOMIPO America Inc. 9,424 593 118 (1,033 ) KOSEP USA, Inc. 1 5,147 — (119 ) PT. EWP Indonesia 34,455 5 — 5,124 KEPCO Netherlands J3 B.V. 120,006 74 — (79 ) Korea Offshore Wind Power Co., Ltd. 284,495 117,527 — (12,768 ) Global One Pioneer B.V. 180 73 — (86 ) Global Energy Pioneer B.V. 348 80 — (90 ) Mira Power Limited 356,111 285,577 — (971 ) KOSEP Material Co., Ltd. 2,788 1,186 3,357 22 Commerce and Industry Energy Co., Ltd. 90,637 43,985 32,728 (7,532 ) KEPCO KPS Philippines Corp. 5,198 1,341 6,246 2 KOSPO Chile SpA 134,827 49,183 — (456 ) PT. KOWEPO Sumsel Operation And Maintenance Services 135 262 — (1,104 ) Hee mang sunlight Power Co., Ltd. 12,185 8,545 643 75 Fujeij Wind Power Company 218,333 196,964 — 5,515 KOSPO Youngnam Power Co., Ltd. 398,495 307,226 318,338 3,514 VI Carbon Professional Private Special Asset Investment Trust 1 3,002 — — 12 Chitose Solar Power Plant LLC 121,457 106,254 17,103 5,480 KEPCO Energy Solution Co., Ltd. 308,188 2,142 2,843 2,805 2019 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won KEPCO Solar Co., Ltd. (formerly, Solar School Plant Co., Ltd.) ￦ 208,730 3,269 1,962 2,553 KOSPO Power Services Ltda. 3,244 1,564 10,013 452 Energy New Industry Specialized Investment Private Investment Trust(*2) 100,116 17,359 2,418 (7,735 ) KOEN Bylong Pty., Ltd. — 39 — (14 ) KOMIPO Bylong Pty., Ltd. 4 43 — (14 ) KOWEPO Bylong Pty., Ltd. 4 40 — (12 ) KOSPO Bylong Pty., Ltd. 4 40 — (12 ) EWP Bylong Pty., Ltd. 4 40 — (12 ) KOWEPO Lao International 5,430 575 4,308 1,584 KEPCO US Inc. 17,231 — — — KEPCO Alamosa LLC 33,515 183 145 (311 ) KEPCO Solar of Alamosa, LLC (formerly, Cogentrix of Alamosa, LLC) 65,468 50,348 8,739 (1,902 ) KEPCO-LG 27,439 30,287 — (1,240 ) Mangilao Investment LLC 39,972 — — — KEPCO-LG 39,373 11 — (524 ) Jeju Hanlim Offshore Wind Co., Ltd. 14,328 558 — (2,459 ) PT. Siborpa Eco Power 11,574 71 — (1,165 ) PT. Korea Energy Indonesia 1,592 121 2,462 323 KOLAT SpA 31,178 167 656 (296 ) KEPCO California, LLC 44,074 936 358 (513 ) KEPCO Mojave Holdings, LLC 103,815 69,544 — (4,215 ) Incheon Fuel Cell Co., Ltd. 22,669 475 — (1,010 ) KOEN Service Co., Ltd. 5,347 4,252 25,890 543 KOMIPO Service Co., Ltd. 3,327 2,622 24,556 146 KOWEPO Service Co., Ltd. 4,228 3,302 23,982 389 KOSPO Service Co., Ltd. 3,493 2,788 18,741 135 EWP Service Co., Ltd. 4,786 4,064 20,837 162 PT. KOMIPO Energy Indonesia 2,647 196 1,392 79 KNF partners Co., Ltd. 1,378 890 3,383 187 KOSPO USA Inc. 5,896 127 — (1,408 ) Nambu USA LLC 245 1 — 245 Tamra Offshore Wind Power Co., Ltd. 156,708 121,724 19,670 1,154 KEPCO MCS Co., Ltd. 26,510 22,151 129,393 3,408 KEPCO FMS Co., Ltd. 11,336 10,638 37,627 198 Firstkeepers Co., Ltd. 1,552 2,800 121 (2,239 ) Secutec Co., Ltd. 322 229 — (597 ) SE Green Energy Co., Ltd. 132,727 105,619 — 816 2019 Subsidiaries Total assets Total liabilities Sales Profit (loss) for the year In millions of won KEPCO Mangilao America LLC ￦ — — — — Mangilao Intermediate Holdings LLC 13,220 12,774 — (66 ) KEPCO CSC Co., Ltd. 837 51 — (14 ) KOAK Power Limited 15,930 — — — KOMIPO Europe B.V. 7,362 — — (286 ) Haenanum Energy Fund 28,101 1 — 1 Paju Ecoenergy Co., Ltd. 53,839 — — — (*1) Financial information of EWP America Inc. includes that of six other subsidiaries, EWP Renewable Corporation, DG Fairhaven Power, LLC, DG Whitefield, LLC, Springfield 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 three other subsidiaries, BSK E-New e-New e-New 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 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. (formerly, Solar School Plant 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 (formerly, KEPCO-LG 25,785 28,924 — (502 ) Mangilao Investment LLC 38,090 14 — (15 ) KEPCO Mangilao Solar, LLC (formerly, KEPCO-LG 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 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
Significant restrictions on abilities to subsidiaries	Company Nature and extent of any significant restrictions Gyeonggi Green Energy Co., Ltd. Acquisition or disposal of assets of more than ￦35 billion, change in the capacity of cogeneration units (except for the change due to performance improvement of equipment, maintenance) will require unanimous consent of all directors of the company. KOSPO Youngnam Power Co., Ltd. Dividends can only be paid when all conditions of the loan agreement are satisfied, or prior written consent of financial institutions is obtained. Company’s shares cannot be wholly or partially transferred without prior written consent of 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 supply certificate can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions is obtained. Company Nature and extent of any significant restrictions Korea Offshore Wind Power Co., Ltd. Principals and interest payments on subordinated loans or payments for dividends and settlement amounts for renewable energy supply certificate can only be paid when all conditions of the loan agreement are satisfied and prior written consent of financial institutions are obtained. Shares cannot be wholly or partially transferred without prior written consent of financial institutions.
Details of non-controlling interest prior to intra-group eliminations	Details of non-controlling 2018 Description KEPCO Ilijan Corporation KEPCO Plant Service & Engineering Co., Ltd. KEPCO Engineering & Construction Company, Inc. Others Total In millions of won Percentage of ownership 49.00 % 49.00 % 33.92 % Current assets ￦ 163,622 628,725 281,390 956,928 2,030,665 Non-current 267,822 646,640 490,090 2,760,500 4,165,052 Current liabilities (16,819 ) (270,097 ) (248,402 ) (559,552 ) (1,094,870 ) Non-current (36,594 ) (26,331 ) (61,698 ) (1,933,583 ) (2,058,206 ) Net assets 378,031 978,937 461,380 1,224,293 3,042,641 Book value of non-controlling 185,235 479,679 156,500 680,963 1,502,377 Sales 99,844 1,239,604 433,701 966,037 2,739,186 Profit for the period 49,631 160,791 12,937 92,457 315,816 Profit for the period attributable to non-controlling 24,319 78,788 4,388 28,475 135,970 Cash flows from operating activities 92,822 129,700 81,042 110,448 414,012 Cash flows from investing activities (4,452 ) (123,593 ) (50,569 ) 35,167 (143,447 ) Cash flows from financing activities before dividends to non-controlling (53,733 ) (33,737 ) (14,591 ) (374,669 ) (476,730 ) Dividends to non-controlling (51,626 ) (32,414 ) (2,839 ) (23,452 ) (110,331 ) Effect of exchange rate fluctuation 2,840 (124 ) 31 1,304 4,051 Net increase (decrease) of cash and cash equivalents (14,149 ) (60,168 ) 13,074 (251,202 ) (312,445 ) 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 )
Changes in goodwill	(i) Details of goodwill as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Acquisition cost ￦ 97,977 98,166 Less: Accumulated impairment — — Carrying book value ￦ 97,977 98,166 (ii) Changes in goodwill for the years ended December 31, 2019 and 2020 are as follows: 2019 Beginning Increase Decrease Ending In millions of won Acquisition cost ￦ 2,582 95,395 — 97,977 Less: Accumulated impairment — — — — Carrying book value 2,582 95,395 — 97,977 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
Disposals of subsidiaries	(i) The fair value of proceeds from disposal for the years ended December 31, 2018, 2019 and 2020, respectively, are as follows: 2018 2019 2020 In millions of won Consideration received in cash and cash equivalents ￦ 160 4 389 Net assets transferred due to liquidation — — 1,084 Total ￦ 160 4 1,473 (ii) The carrying value of assets and liabilities of subsidiaries as of the date the Company lost its control during the years ended December 31, 2018, 2019 and 2020, respectively, are as follows: 2018 2019 2020 In millions of won Assets Cash and cash equivalents ￦ 175 97 1,656 Trade and other receivables 11 — 395 Inventories — — 2,801 Other non-financial — 1 98 PP&E and intangible assets — 2 3,812 Liabilities Trade and other payables (28 ) (3 ) (935 ) Other non-financial — (24 ) — ￦ 158 73 7,827 (iii) Gain on disposals of subsidiaries for the years ended December 31, 2018, 2019 and 2020, respectively, are as follows: 2018 2019 2020 In millions of won Fair value of proceeds from disposal ￦ 160 4 1,473 Net assets disposed (158 ) (73 ) (7,827 ) Realization of unrealized gain (loss) 70 (187 ) — Other comprehensive income (loss) (cumulative foreign currency translation of foreign operations) — — (256 ) Gain (loss) on disposals of subsidiaries(*) ￦ 72 (256 ) (6,610 ) (*) Gain (loss) on disposals of subsidiaries is included in the ‘Gain (loss) on disposal of investments in subsidiaries’ the consolidated statements of comprehensive income (loss). (iv) Net cash flow from disposals of subsidiaries for the years ended December 31, 2018, 2019 and 2020, respectively, are as follows: 2018 2019 2020 In millions of won Consideration received in cash and cash equivalents ￦ 160 4 389 Less: cash and cash equivalents held by disposed subsidiaries (175 ) (97 ) (1,656 ) Net cash flow ￦ (15 ) (93 ) (1,267 )
Cash dividends received from subsidiaries	Cash dividends received from subsidiaries for the years ended December 31, 2018, 2019 and 2020, respectively, are as follows: Subsidiaries 2018 2019 2020 In millions of won Korea Hydro & Nuclear Power Co., Ltd. ￦ 281,234 — 106,675 Korea South-East Power Co., Ltd. 33,928 7,143 11,905 Korea Midland Power Co., Ltd. 26,581 — — Korea Western Power Co., Ltd. 28,996 — — Korea Southern Power Co., Ltd. 25,780 15,277 — Korea East-West Power Co., Ltd. 61,408 985 17,959 KEPCO Engineering & Construction Company, Inc. 5,531 3,519 7,793 KEPCO Plant Service & Engineering Co., Ltd. 33,739 41,084 44,068 KEPCO Nuclear Fuel Co., Ltd. 1,077 4,219 7,270 KEPCO KDN Co., Ltd. 13,888 19,136 14,720 KEPCO International HongKong Ltd. 23,314 10,243 11,858 KEPCO International Philippines Inc. 52,507 70,480 — KEPCO Ilijan Corporation 53,900 65,776 34,502 KEPCO Philippines Holdings Inc. — 63,522 70,876 KOSEP Australia Pty., Ltd. — 8,120 1,856 KOSPO Australia Pty., Ltd. — 4,335 — Qatrana Electric Power Company 6,240 10,313 — KEPCO KPS Philippines Corp. — 3,854 1,215 Tamra Offshore Wind Power Co., Ltd. — 4,823 2,640 KEPCO Netherlands S3 B.V. 3,115 874 6,981 PT. KOMIPO Pembangkitan Jawa Bali 20,658 1,971 — KEPCO Netherlands J3 B.V. 12,090 — — Gyeongju Wind Power Co., Ltd. — 2,800 2,800 VI Carbon Professional Private Special Asset Investment Trust 1 11 11 7 KOSPO Power Services Limitada 993 745 — KEPCO Netherlands B.V. 17,424 13,266 11,098 PT. Cirebon Power Service 382 — 221 Chitose Solar Power Plant LLC 1,986 814 858 Fujeij Wind Power Company — — 6,306 KOSPO Jordan LLC — — 535 Energy Innovation Fund I — — 19 ￦ 704,782 353,310 362,162

Investments in Associates and_2

Investments in Associates and Joint Ventures (Tables)	12 Months Ended
	Dec. 31, 2020
Investments in Associates and Joint Ventures [Abstract]
Investments in Associates and Joint Ventures	Investments in associates and joint ventures as of December 31, 2019 and 2020 are as follows: 2019 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 1,693,967 Korea Electric Power Industrial Development Co., Ltd. Electricity metering and others KOREA 29.00 % 4,727 25,393 YTN Co., Ltd. Broadcasting KOREA 21.43 % 59,000 39,747 Cheongna Energy Co., Ltd. Generating and distributing vapor and hot/cold water KOREA 43.90 % 48,353 1,411 Gangwon Wind Power Co., Ltd.(*2) Power generation KOREA 15.00 % 5,725 12,327 Hyundai Green Power Co., Ltd. Power generation KOREA 29.00 % 88,885 124,253 Korea Power Exchange(*5) Management of power market and others KOREA 100.00 % 127,839 258,899 Hyundai Energy Co., Ltd.(*7) Power generation KOREA 30.66 % 71,070 — Ecollite Co., Ltd. Artificial light-weight aggregate KOREA 36.10 % 1,516 — Taebaek Wind Power Co., Ltd. Power generation KOREA 25.00 % 3,810 7,039 Taebaek Guinemi Wind Power Co., Ltd. Power generation KOREA 25.00 % 3,420 2,553 Pyeongchang Wind Power Co., Ltd. Power generation KOREA 25.00 % 3,875 5,877 Daeryun Power Co., Ltd.(*2) Power generation KOREA 9.34 % 40,854 26,247 Changjuk Wind Power Co., Ltd. Power generation KOREA 30.00 % 3,801 8,520 KNH Solar Co., Ltd. Power generation KOREA 27.00 % 1,296 2,382 SPC Power Corporation Power generation PHILIPPINES 38.00 % 20,635 63,583 Gemeng International Energy Co., Ltd. Power generation CHINA 34.00 % 413,153 670,896 PT. Cirebon Electric Power Power generation INDONESIA 27.50 % 40,365 123,425 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 29,355 PT. Bayan Resources TBK Resources development INDONESIA 20.00 % 615,860 445,141 S-Power Power generation KOREA 49.00 % 132,300 115,784 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 72,935 Hadong Mineral Fiber Co., Ltd.(*2) Recycling fly ashes KOREA 8.33 % 50 — Green Biomass Co., Ltd.(*9) Power generation KOREA 7.85 % 714 108 PT. Mutiara Jawa Manufacturing and operating floating coal terminal INDONESIA 29.00 % 2,978 1,438 Samcheok Eco Materials Co., Ltd.(*8) Recycling fly ashes KOREA 2.35 % 686 — Noeul Green Energy Co., Ltd. Power generation KOREA 29.00 % 1,740 6,610 Naepo Green Energy Co., Ltd. Power generation KOREA 41.67 % 29,200 — Goseong Green Power Co., Ltd.(*2) Power generation KOREA 1.12 % 2,900 2,340 Gangneung Eco Power Co., Ltd.(*2) Power generation KOREA 1.61 % 2,900 2,430 Shin Pyeongtaek Power Co., Ltd. Power generation KOREA 40.00 % 72,000 66,956 Haeng Bok Do Si Photovoltaic Power Co., Ltd. Power generation KOREA 28.00 % 194 215 Dongducheon Dream Power Co., Power generation KOREA 33.61 % 148,105 76,547 Jinbhuvish Power Generation Pvt. Power generation INDIA 5.16 % ￦ 9,000 — Daejung Offshore Wind Power Co., Power generation KOREA 49.90 % 5,190 2,361 GS Donghae Electric Power Co., Power generation KOREA 34.00 % 204,000 255,983 Daegu Photovoltaic Co., Ltd. Power generation KOREA 29.00 % 1,230 2,060 Busan Green Energy Co., Ltd. Power generation KOREA 29.00 % 5,243 10,637 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 1,063 Korea Nuclear Partners Co., Ltd. Electric material agency KOREA 29.00 % 290 — Korea Electric Power Corporation Developing electric enterprises KOREA 98.09 % 51,500 41,126 Energy Infra Asset Management Co., Asset management KOREA 9.90 % 297 791 Daegu clean Energy Co., Ltd. Renewable power generation KOREA 28.00 % 140 13 Yaksu ESS Co., Ltd. Installing ESS related equipment KOREA 29.00 % 210 516 Nepal Water & Energy Development Company Private Limited(*12) Construction and operation of utility plant NEPAL 57.76 % 35,571 31,145 Gwangyang Green Energy Co., Ltd. Power generation KOREA 20.00 % 2,000 948 PND solar Co., Ltd. Power generation KOREA 29.00 % 1,250 1,144 Hyundai Eco Energy Co., Ltd.(*2) Power generation KOREA 19.00 % 3,610 3,781 YeongGwang Yaksu Wind Electric Co., Power generation KOREA 9.63 % 533 386 Green Energy Electricity Generation Co., Ltd. Power generation KOREA 29.00 % 1,189 163 Korea Energy Solutions Co., Ltd. R & D KOREA 20.00 % 300 259 ITR Co., Ltd. R & D KOREA 20.00 % 50 33 Structure test network Co., Ltd. Technical testing and consulting KOREA 20.00 % 25 21 Namjeongsusang Solar Power Operation Co., Ltd.(*17) Power generation KOREA 15.00 % 969 812 Indeck Niles Development, LLC(*22) Power generation USA 50.00 % — — Indeck Niles Asset Management, LLC Power generation USA 33.33 % — 87 Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 Holding company KOREA 49.00 % 7,105 7,126 Suwon New Power Co., Ltd. Power generation KOREA 39.90 % 798 798 KPGE Inc. Power generation materials business KOREA 29.00 % 287 287 Gwangbaek Solar Power Investment Co., Ltd.(*20) Power generation KOREA 19.00 % 2,054 2,054 Go deok Clean Energy Co., Ltd.(*19) Fuel cell generation KOREA 61.00 % 1,830 1,830 2,539,956 4,251,802 <Joint ventures> KEPCO-Uhde Inc.(*6) Power generation KOREA 52.80 % ￦ 11,355 134 Shuweihat Asia Power Investment B.V. Holding company NETHERLANDS 49.00 % 44,405 18,318 Shuweihat Asia Operation & Maintenance Company(*6) Maintenance of utility plant CAYMAN 55.00 % 30 1,408 Waterbury Lake Uranium L.P. Resources development CANADA 33.41 % 26,602 20,562 ASM-BG Power generation BULGARIA 50.00 % 16,101 19,376 RES Technology AD Power generation BULGARIA 50.00 % 15,595 16,248 KV Holdings, Inc. Power generation PHILIPPINES 40.00 % 2,103 2,441 KEPCO SPC Power Corporation(*6) Construction and operation of utility plant PHILIPPINES 75.20 % 94,579 214,794 Gansu Datang Yumen Wind Power Co., Ltd. Power generation CHINA 40.00 % 16,621 8,149 Datang Chifeng Renewable Power Co., Ltd. Power generation CHINA 40.00 % 121,928 185,307 Datang KEPCO Chaoyang Renewable Power Co., Ltd. Power generation CHINA 40.00 % 39,872 41,024 Rabigh Electricity Company Power generation SAUDI ARABIA 40.00 % 109,743 109,096 Rabigh Operation & Maintenance Company Limited Maintenance of utility plant SAUDI ARABIA 40.00 % 70 6,879 Jamaica Public Service Company Limited Power generation JAMAICA 40.00 % 301,910 253,607 KW Nuclear Components Co., Ltd. Manufacturing KOREA 45.00 % 833 9,052 Busan Shinho Solar Power Co., Ltd. Power generation KOREA 25.00 % 2,100 5,045 Global Trade Of Power System Co., Ltd. Exporting products and technology of small or medium business by proxy KOREA 29.00 % 290 571 Expressway Solar-light Power Generation Co., Ltd. Power generation KOREA 29.00 % 1,856 2,883 Amman Asia Electric Power Power generation JORDAN 60.00 % 111,476 192,164 KAPES, Inc.(*6) R&D KOREA 51.00 % 5,629 10,832 Honam Wind Power Co., Ltd. Power generation KOREA 29.00 % 3,480 4,375 Jeongam Wind Power Co., Ltd.(*15) Power generation KOREA 40.00 % 5,580 4,437 Korea Power Engineering Service Co., Ltd.(*15) Construction and service KOREA 29.00 % 290 4,902 Chun-cheon Energy Co., Ltd. Power generation KOREA 29.90 % 52,700 34,872 Yeonggwangbaeksu Wind Power Co., Ltd.(*3) Power generation KOREA 15.00 % 3,000 3,040 Nghi Son 2 Power LLC Power generation VIETNAM 50.00 % 2,781 — Kelar S.A.(*6) Power generation CHILE 65.00 % 78,060 70,462 PT. Tanjung Power Indonesia Power generation INDONESIA 35.00 % 26,892 34,327 Incheon New Power Co., Ltd.(*24) Power generation KOREA 29.00 % 461 — Seokmun Energy Co., Ltd. Power generation KOREA 29.00 % 15,370 17,342 Daehan Wind Power PSC Power generation JORDAN 50.00 % 3,191 1,757 Barakah One Company(*11) Power generation UAE 18.00 % 118 — Nawah Energy Company(*11) Operation of utility plant UAE 18.00 % 296 285 MOMENTUM International thermonuclear experimental reactor construction management FRANCE 33.33 % ￦ 1 553 Daegu Green Power Co., Ltd.(*25) Power generation KOREA 29.00 % 46,225 22,824 Yeonggwang Wind Power Co., Ltd. Power generation KOREA 46.00 % 17,475 17,627 Chester Solar IV SpA Power generation CHILE 45.00 % 1,700 672 Chester Solar V SpA Power generation CHILE 45.00 % 525 146 Diego de Almagro Solar SpA Power generation CHILE 45.00 % 2,091 1,035 South Jamaica Power Company Limited Power generation JAMAICA 20.00 % 20,521 13,863 Daesan Green Energy Co., Ltd. Power generation KOREA 35.00 % 17,850 17,182 RE Holiday Holdings LLC Power generation USA 50.00 % 42,948 42,070 RE Pioneer Holdings LLC Power generation USA 50.00 % 27,891 31,156 RE Barren Ridge 1 Holdings LLC Power generation USA 50.00 % 28,021 42,916 RE Astoria 2 LandCo LLC Power generation USA 50.00 % 5,188 5,602 RE Barren Ridge LandCo LLC Power generation USA 50.00 % 2,187 1,966 Laurel SpA Power generation CHILE 45.00 % 1,222 595 KIAMCO KOWEPO Bannerton Hold Co Pty Ltd(*3) Power generation AUSTRALIA 12.37 % 4,095 4,024 Chile Solar JV SpA Power generation CHILE 50.00 % 37,689 34,859 Taebaek Gadeoksan Wind Power Co., Ltd. Power generation KOREA 37.78 % 8,500 7,846 Cheong-Song Noraesan Wind Power Co., Ltd. Power generation KOREA 29.01 % 3,200 3,043 Chester Solar I SpA Power generation CHILE 45.00 % 1,181 1,157 Solar Philippines Calatagan Corporation Power generation PHILIPPINES 38.00 % 47,903 48,930 Saemangeum Solar Power Co., Ltd.(*21) Power generation KOREA 81.00 % 10,000 8,324 Chungsongmeon BongSan wind power Co., Ltd. Power generation KOREA 29.00 % 2,900 2,764 Jaeun Resident Wind Power Plant Co., Ltd. Power generation KOREA 29.00 % 2,494 2,198 DE Energia SpA Power generation CHILE 49.00 % 8,364 8,665 Dangjin Eco Power Co., Ltd. Power generation KOREA 34.00 % 25,661 25,661 Haemodum Solar Co., Ltd. Power generation KOREA 49.00 % 2,940 2,940 Yangyang Wind Power Co., Ltd.(*16) Power generation KOREA 99.54 % 10,800 10,800 Horus Solar, S.A. De C.V.(*18) Renewable power generation MEXICO 14.95 % 3,403 3,403 Recursos Solares PV De Mexico II, S.A. De C.V.(*18) Renewable power generation MEXICO 14.95 % 672 672 Sunmex Renovables, S.A. De C.V.(*18) Renewable power generation MEXICO 14.95 % 222 222 Stavro Holding II A.B. Holding company SWEDEN 20.00 % 5,524 5,625 1,504,710 1,663,029 ￦ 4,044,666 5,914,831 (*1) The effective percentage of ownership is 21.57% 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) 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. (*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 influence on the entity. (*5) The effective percentage of ownership is 100%. However, the Government regulates the Company’s ability to make operating and financial decisions over the entity, as the Government requires maintaining arms-length transactions between KPX and the Company’s other subsidiaries. The Company can exercise significant influence by virtue of right to nominate directors to the board of directors of the entity. (*6) The effective percentage of ownership is 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. (*7) As of December 31, 2019, 15.64% of ownership of Hyundai Energy Co., Ltd. is held by NH Power ll Co., Ltd. and NH Bank. According to the shareholders’ agreement reached on March 2011, not only does the Company have a call option to acquire the investment in Hyundai Energy Co., Ltd. from NH Power ll Co., Ltd. and NH Bank with a certain rate of return, NH Power ll Co., Ltd. and NH Bank also have put options to dispose of their investment to the Company. In connection with this agreement, the Company applied the equity method on the investment in Hyundai Energy Co., Ltd. with 46.30% of ownership. (*8) 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. (*9) The effective percentage of ownership is less than 20% but the Company can exercise significant influence by virtue of its contractual right to appoint a director to the board of directors of the entity and the fact that the dominant portion of the investee’s sales transactions is generated from the Company. (*10) 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. (*11) The effective percentage of ownership is less than 20% but the Company has joint control over the entity as decisions on the major activities require the unanimous consent of the parties that collectively control the entity. (*12) 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. (*13) The effective percentage of ownership is 34.01% considering the conversion of redeemable convertible preferred stock into ordinary stock. (*14) Eumseong Natural Gas Power Co., Ltd. and Dangjin Eco Solar Power Co., Ltd. were established by spin-off spin-off, (*15) Daejung Offshore Wind Power Co., Ltd. and GS Donghae Electric Power Co., Ltd. are reclassified from joint ventures to associates, and Jeongam Wind Power Co., Ltd. and Korea Power Engineering Service Co., Ltd. are reclassified from associates to joint ventures during the year ended December 31, 2019. (*16) The temporary percentage of ownership is more than 50% due to differences in the timing of the payment. The Company is expected to exert significant influence after payment is completed in the first quarter of 2020. (*17) The effective percentage of ownership is less than 20%. However, the Company considers the major decision-making body to be the general decision of the board of directors, and the general decision of the board of directors can be passed only by two directors. Accordingly, the entities are classified as an associate. (*18) The effective percentage of ownership is less than 20%. However, according to the shareholders’ agreement, decisions on the major activities must be agreed to by all ownership parties. Accordingly, the entities are classified as joint ventures. (*19) Even though the effective percentage of ownership is more than 50%, the Company does not hold control over the entity according to its proportion to make decisions, which is less than 50%. 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. (*20) 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. (*21) The effective percentage of ownership is more than 50%. However, according to the shareholders’ agreement, all operation related decisions must be agreed by all ownership parties. Accordingly, the entity is classified as a joint venture. (*22) Although the investment amount is not paid as of December 31, 2019, the Company has an investment agreement on 50% of the interests. the Company can exercise significant influence by virtue of its contractual right to appoint a director to the board of directors of the entity. (*23) 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 is no business activities occurring. (*24) 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. (*25) Although the nominal percentage of ownership is 29.00%, the effective percentage of ownership is 52.24%, considering the interest of financial investors as a liability component. 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., 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 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 solar Co., Ltd. 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 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 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.S. 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 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 own
The fair value of associates	The fair value of associates which are actively traded on an open market and have a readily available market value as of December 31, 2019 and 2020 are as follows: Investees 2019 2020 In millions of won <Associates> Korea Electric Power Industrial Development Co., Ltd. ￦ 33,089 45,048 Korea Gas Corporation(*) 715,365 584,010 YTN Co., Ltd. 18,450 27,000 SPC Power Corporation 117,230 139,698 PT. Bayan Resources TBK 880,860 798,510 (*) An indicator of impairment has been identified for the Company’s investment in Korea Gas Corporation (“KOGAS”) for the years ended December 31, 2019 and 2020 as management determined that the carrying amount of the investment in KOGAS at ￦ 1,693,967 million and ￦ 1,647,325 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, 2019 and 2020 are supported by the recoverable amount determination and as such, no impairment has been recognized for the years ended December 31, 2019 and 2020. 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.
Changes in investments in associates and joint ventures	Changes in investments in associates and joint ventures for the years ended December 31, 2019 and 2020 are as follows: 2019 Investees Beginning Acquisition Disposal Dividends Share of Other (loss) Others Ending In millions of won <Associates> Korea Gas Corporation ￦ 1,701,848 — — (25,704 ) 8,511 12,687 (3,375 ) 1,693,967 Korea Electric Power Industrial Development Co., Ltd. 21,838 — — (1,598 ) 5,002 — 151 25,393 YTN Co., Ltd. 40,338 — — (180 ) (449 ) 5 33 39,747 Cheongna Energy Co., Ltd. 3,465 — — — (2,054 ) — — 1,411 Gangwon Wind Power Co., Ltd. 13,220 — — (2,272 ) 1,379 — — 12,327 Hyundai Green Power Co., Ltd. 127,160 — — (8,889 ) 5,982 — — 124,253 Korea Power Exchange 251,802 — — — 10,907 — (3,810 ) 258,899 AMEC Partners Korea Ltd. 209 — — — — 3 (212 ) — Hyundai Energy Co., Ltd. — — — — — — — — Ecollite Co., Ltd. — — — — — — — — Taebaek Wind Power Co., Ltd. 5,665 — — — 1,374 — — 7,039 Taebaek Guinemi Wind Power Co., Ltd. 2,569 — — — (16 ) — — 2,553 Pyeongchang Wind Power Co., Ltd. 5,419 — — — 458 — — 5,877 Daeryun Power Co., Ltd. 26,099 — — — 173 — (25 ) 26,247 Changjuk Wind Power Co., Ltd. 8,086 — — — 434 — — 8,520 KNH Solar Co., Ltd. ￦ 2,337 — — — 45 — — 2,382 SPC Power Corporation 57,558 — — (14,229 ) 5,929 14,286 39 63,583 Gemeng International Energy Co., Ltd. 647,010 — — (11,468 ) 26,300 9,209 (155 ) 670,896 PT. Cirebon Electric Power 108,628 — — — 11,079 (65 ) 3,783 123,425 KNOC Nigerian East Oil Co., Ltd. — — — — (27 ) (380 ) 407 — KNOC Nigerian West Oil Co., Ltd. — — — — (29 ) (349 ) 378 — PT Wampu Electric Power 31,097 — — — (2,867 ) 2 1,123 29,355 PT. Bayan Resources TBK 511,646 — — (71,100 ) 6,181 (1,586 ) — 445,141 S-Power 114,566 — — — 1,218 — — 115,784 Pioneer Gas Power Limited 20,395 — — — (20,784 ) 389 — — Eurasia Energy Holdings — — — — — — — — Xe-Pian Xe-Namnoy 77,165 3,052 — — (10,210 ) 2,928 — 72,935 Hadong Mineral Fiber Co., Ltd. — — — — — — — — Green Biomass Co., Ltd. 115 — — — (73 ) — 66 108 PT. Mutiara Jawa 365 — — — 1,031 42 — 1,438 Samcheok Eco Materials Co., Ltd. — — — — — — — — Noeul Green Energy Co., Ltd. 8,015 — — — (1,395 ) — (10 ) 6,610 Naepo Green Energy Co., Ltd. — — — — — — — — Goseong Green Power Co., Ltd. 2,459 — — — (119 ) — — 2,340 Gangneung Eco Power Co., Ltd. 2,495 — — — (65 ) — — 2,430 Shin Pyeongtaek Power Co., Ltd. 67,600 — — — (827 ) 198 (15 ) 66,956 Haeng Bok Do Si Photovoltaic Power Co., Ltd. 202 — — — 13 — — 215 Dongducheon Dream Power Co., Ltd. 76,386 — — — 441 — (280 ) 76,547 Jinbhuvish Power Generation Pvt. Ltd. — — — — — — — — Daejung Offshore Wind Power Co., Ltd. — — — — — — 2,361 2,361 GS Donghae Electric Power Co., Ltd. — — — — — — 255,983 255,983 SE Green Energy Co., Ltd. 3,366 — — — — (75 ) (3,291 ) — Daegu Photovoltaic Co., Ltd. 2,002 — — (327 ) 385 — — 2,060 Jeongam Wind Power Co., Ltd. 4,589 — — — (152 ) — (4,437 ) — Korea Power Engineering Service Co., Ltd. 4,333 — — — 508 — (4,841 ) — Busan Green Energy Co., Ltd. 12,537 — — — (1,884 ) — (16 ) 10,637 Gunsan Bio Energy Co., Ltd. — — — — — — — — Korea Electric Vehicle Charging Service 1,593 — — — (515 ) — (15 ) 1,063 Ulleungdo Natural Energy Co., Ltd. 4,628 — — — (1 ) — (4,627 ) — Korea Nuclear Partners Co., Ltd.(*1) 175 — — — (79 ) — (96 ) — Tamra Offshore Wind Power Co., Ltd. ￦ 10,401 — — — — — (10,401 ) — Korea Electric Power Corporation Fund 47,189 — — — (6,931 ) 868 — 41,126 Energy Infra Asset Management Co., Ltd. 665 — — — 126 — — 791 Daegu clean Energy Co., Ltd. 17 — — — (4 ) — — 13 Yaksu ESSYaksu ESS Co., Ltd. 460 — — — 56 — — 516 Nepal Water & Energy Development Company Private Limited 30,961 — — — (854 ) 1,038 — 31,145 Gwangyang Green Energy Co., Ltd. 1,206 — — — (258 ) — — 948 PND solar Co., Ltd. 1,020 — — — 124 — — 1,144 Hyundai Eco Energy Co., Ltd. 3,388 — — — 393 — — 3,781 YeongGwang Yaksu Wind Electric Co., Ltd 533 — — — (147 ) — — 386 Green Energy Electricity Generation Co., Ltd. — 1,189 — — (1,026 ) — — 163 Korea Energy Solutions Co., Ltd. — 300 — — (41 ) — — 259 ITR Co., Ltd. — 50 — — (17 ) — — 33 Structure Test Network Co., Ltd. — 25 — — (4 ) — — 21 Namjeongsusang Solar Power Operation Co., Ltd. — 969 — — (157 ) — — 812 Indeck Niles Development, LLC — — — — — — — — Indeck Niles Asset Management, LLC — — — (245 ) 333 (1 ) — 87 Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 — 7,105 — — 21 — — 7,126 Suwon New Power Co., Ltd. — 798 — — — — — 798 KPGE Inc. — 287 — — — — — 287 Gwangbaek Solar Power Investment Co., Ltd. — 2,054 — — — — — 2,054 Godeok Clean Energy Co., Ltd. — 1,830 — — — — — 1,830 4,064,820 17,659 — (136,012 ) 37,418 39,199 228,718 4,251,802 <Joint ventures> KEPCO-Uhde Inc. 188 — — — (54 ) — — 134 Eco Biomass Energy Sdn. Bhd. — — — — — — — — Shuweihat Asia Power Investment B.V. 27,251 — — (2,176 ) 5,288 (12,045 ) — 18,318 Shuweihat Asia Operation & Maintenance Company 792 — — (907 ) 1,040 (1 ) 484 1,408 Waterbury Lake Uranium L.P. 19,032 — — — 22 1,508 — 20,562 ASM-BG 21,379 — — (4,760 ) 2,442 315 — 19,376 RES Technology AD 15,209 — — — 963 76 — 16,248 KV Holdings, Inc. 1,918 — — (372 ) 751 144 — 2,441 KEPCO SPC Power Corporation ￦ 208,306 — — (45,349 ) 48,043 3,781 13 214,794 Gansu Datang Yumen Wind Power Co., Ltd. 9,981 — — — (2,050 ) 218 — 8,149 Datang Chifeng Renewable Power Co., Ltd. 166,162 — — — 16,325 2,820 — 185,307 Datang KEPCO Chaoyang Renewable Power Co., Ltd. 39,442 — — — 875 707 — 41,024 Rabigh Electricity Company 105,328 — — — 4,355 (1,734 ) 1,147 109,096 Rabigh Operation & Maintenance Company Limited 5,834 — — (2,222 ) 3,070 197 — 6,879 Jamaica Public Service Company Limited 239,632 — — (4,631 ) 10,166 8,440 — 253,607 KW Nuclear Components Co., Ltd. 7,708 — — (208 ) 1,552 — — 9,052 Busan Shinho Solar Power Co., Ltd. 4,761 — — (430 ) 714 — — 5,045 GS Donghae Electric Power Co., Ltd. 240,591 — — (10,200 ) 25,787 — (256,178 ) — Global Trade Of Power System Co., Ltd. 515 — — — 56 — — 571 Expressway Solar-light Power Generation Co., Ltd. 2,676 — — — 207 — — 2,883 Daejung Offshore Wind Power Co., Ltd. 2,669 — — — (308 ) — (2,361 ) — Amman Asia Electric Power Company 177,357 — — — 20,648 (5,841 ) — 192,164 KAPES, Inc. 9,079 — — — 1,767 — (14 ) 10,832 Dangjin Eco Power Co., Ltd. 19,912 — (5,359 ) — (657 ) 16 (13,912 ) — Honam Wind Power Co., Ltd. 4,860 — — (587 ) 102 — — 4,375 Jeongam Wind Power Co., Ltd. — — — — — — 4,437 4,437 Korea Power Engineering Service Co., Ltd. — — — — — — 4,902 4,902 Chun-cheon Energy Co., Ltd.(*3) 42,505 — — — (7,385 ) — (248 ) 34,872 Yeonggwangbaeksu Wind Power Co., Ltd. 2,843 — — — 197 — — 3,040 Nghi Son 2 Power LLC — — — — — — — — Kelar S.A. 72,824 — — — 3,435 (8,416 ) 2,619 70,462 PT. Tanjung Power Indonesia 7,081 26,146 — — 5,601 (4,489 ) (12 ) 34,327 Incheon New Power Co., Ltd.(*4) 579 — — — (232 ) — (347 ) — Seokmun Energy Co., Ltd. 16,751 — — — 591 — — 17,342 Daehan Wind Power PSC 1,632 — — — 66 59 — 1,757 Barakah One Company 3,807 — — — (2,668 ) (1,139 ) — — Nawah Energy Company 274 — — — — 11 — 285 Momentum 582 — — (411 ) 380 2 — 553 Daegu Green Power Co., Ltd.(*2) 41,110 — — — 3,599 — (21,885 ) 22,824 Yeonggwang Wind Power Co., Ltd. 15,304 2,100 — — 223 — — 17,627 Chester Solar IV SpA 1,851 — — — (1,746 ) (55 ) 622 672 Chester Solar V SpA 474 — — — (619 ) (6 ) 297 146 Diego de Almagro Solar SpA ￦ 1,663 — — — (1,014 ) (86 ) 472 1,035 South Jamaica Power Company Limited 16,124 4,290 — — (7,131 ) 580 — 13,863 Daesan Green Energy Co., Ltd. 17,433 — — — (251 ) — — 17,182 RE Holiday Holdings LLC 51,094 — — — (6,525 ) (2,500 ) 1 42,070 RE Pioneer Holdings LLC 38,898 — — (939 ) (5,507 ) (1,296 ) — 31,156 RE Barren Ridge 1 Holdings LLC 41,415 — — (1,152 ) 4,609 (1,957 ) 1 42,916 RE Astoria 2 LandCo LLC 5,410 — — (430 ) 430 192 — 5,602 RE Barren Ridge LandCo LLC 1,898 — — (194 ) 172 90 — 1,966 Laurel SpA 921 — — — (665 ) (82 ) 421 595 KIAMCO KOWEPO Bannerton Hold Co Pty Ltd 3,940 — — — (28 ) 112 — 4,024 Chile Solar JV SpA 36,865 — — — 842 (2,849 ) 1 34,859 Taebaek Gadeoksan Wind Power Co., Ltd. 8,508 — — — (651 ) (9 ) (2 ) 7,846 Cheong-Song Noraesan Wind Power Co., Ltd. 2,073 1,127 — — (153 ) (4 ) — 3,043 Chester Solar I SpA 1,181 — — — (112 ) (79 ) 167 1,157 Solar Philippines Calatagan Corporation 47,903 — — (4,633 ) 4,305 1,355 — 48,930 Saemangeum Solar Power Co., Ltd. — 10,000 — — (1,676 ) — — 8,324 Chungsongmeon BongSan wind power Co., Ltd. — 2,900 — — (136 ) — — 2,764 Jaeun Resident Wind Power Plant Co., Ltd. — 2,494 — — (296 ) — — 2,198 DE Energia SpA — 8,364 — — 647 (346 ) — 8,665 Eumseong Natural Gas Power Co., Ltd. — — — — — — — — Dangjin Eco Power Co., Ltd. (newly) — 9,180 — — — — 16,481 25,661 Haemodum Solar Co., Ltd. — 2,940 — — — — — 2,940 Yangyang Wind Power Co., Ltd. — 10,800 — — — — — 10,800 Horus Solar, S.A. De C.V. — 3,403 — — — — — 3,403 Recursos Solares PV De Mexico II, S.A. De C.V. — 672 — — — — — 672 Sunmex Renovables, S.A. De C.V. — 222 — — — — — 222 Stavro Holding II A.B. — 5,524 — — (4 ) 122 (17 ) 5,625 1,813,525 90,162 (5,359 ) (79,601 ) 129,402 (22,189 ) (262,911 ) 1,663,029 ￦ 5,878,345 107,821 (5,359 ) (215,613 ) 166,820 17,010 (34,193 ) 5,914,831 (*1) It was determined that there is objective evidence of impairment due to prolonged operating losses. As a result, the Company recognized an impairment loss of ￦96 million in impairment loss on investments in associates and joint ventures for the year ended December 31, 2019. (*2) It was determined that there is objective evidence of impairment due to prolonged operating losses. As a result, the Company recognized an impairment loss of ￦21,827 million in impairment loss on investments in associates and joint ventures for the year ended December 31, 2019. (*3) It was determined that there is objective evidence of impairment due to prolonged operating losses. As a result, the Company recognized an impairment loss of ￦248 million in impairment loss on investments in associates and joint ventures for the year ended December 31, 2019. (*4) It was determined that there is objective evidence of impairment due to prolonged operating losses. As a result, the Company recognized an impairment loss of ￦347 million in impairment loss on investments in associates and joint ventures for the year ended December 31, 2019. 2020 Investees Beginning balance Acquisitions Disposals Dividends Share of profit (loss) Other comprehensive income (loss) Others Ending balance 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. (formerly, Hyundai 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 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 Yaksu ESS 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 Co., Ltd. 1,144 — — — 5 — — 1,149 Hyundai Eco Energy Co., Ltd. 3,781 — — — 469 — — 4,250 YeongGwang Yaksu Wind Electric Co., Ltd. 386 — — — (74 ) — — 312 <Associates> 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 Seoroseoro Sunny Power Plant Co., Ltd. — 230 — — — — — 230 Muan Solar Park Co., Ltd. — 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 <Joint ventures> 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 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 <Joint ventures> 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. (formerly, Hyundai 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 an 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.
Summary of financial information of associates and joint ventures	Summary of financial information of associates and joint ventures as of and for the years ended December 31, 2019 and 2020 are as follows: 2019 Investees Total assets Total liabilities Sales Profit (loss) for the year In millions of won <Associates> Korea Gas Corporation(*1) ￦ 39,311,855 31,165,334 24,982,640 38,764 Korea Electric Power Industrial Development Co., Ltd. 186,434 98,872 306,026 17,467 YTN Co., Ltd. 281,699 96,211 127,782 (1,230 ) Cheongna Energy Co., Ltd. 383,034 383,288 68,626 (2,567 ) Gangwon Wind Power Co., Ltd. 83,528 1,674 24,116 9,380 Hyundai Green Power Co., Ltd. 1,086,738 658,279 507,653 26,222 Korea Power Exchange 315,683 54,926 107,034 8,268 Hyundai Energy Co., Ltd. 465,238 549,940 91,842 (27,882 ) Ecollite Co., Ltd. 1,838 304 — (97 ) Taebaek Wind Power Co., Ltd. 36,182 8,027 6,177 5,494 Taebaek Guinemi Wind Power Co., Ltd. 35,061 24,847 349 (61 ) Pyeongchang Wind Power Co., Ltd. 79,756 56,248 10,713 2,010 Daeryun Power Co., Ltd. 802,546 512,757 163,129 1,836 Changjuk Wind Power Co., Ltd. 29,875 1,476 6,076 1,447 KNH Solar Co., Ltd. 20,465 11,641 3,377 278 SPC Power Corporation 250,544 22,459 63,218 39,876 Gemeng International Energy Co., Ltd. 6,758,957 4,785,740 2,024,730 95,435 PT. Cirebon Electric Power 852,457 403,639 277,370 39,581 KNOC Nigerian East Oil Co., Ltd. 58,402 134,361 — (182 ) KNOC Nigerian West Oil Co., Ltd. 54,275 124,086 — (180 ) PT Wampu Electric Power 222,266 158,451 18,165 (2,315 ) PT. Bayan Resources TBK 1,302,637 622,576 1,707,387 252,855 S-Power 805,622 566,025 576,554 2,319 Pioneer Gas Power Limited 309,059 367,399 — (54,501 ) Eurasia Energy Holdings 592 1,056 — — Xe-Pian Xe-Namnoy 1,194,125 898,023 6,731 (40,437 ) Hadong Mineral Fiber Co., Ltd. 203 231 — — Green Biomass Co., Ltd. 3,866 2,487 17 (925 ) PT. Mutiara Jawa 26,109 21,150 11,196 3,396 Samcheok Eco Materials Co., Ltd. 26,625 3,209 10,876 1,946 Noeul Green Energy Co., Ltd. 137,370 114,578 36,435 (4,810 ) Naepo Green Energy Co., Ltd. 77,070 99,345 6,572 (31,577 ) Goseong Green Power Co., Ltd. 3,399,058 3,177,210 — (10,276 ) Gangneung Eco Power Co., Ltd. 1,362,692 1,204,202 — (3,830 ) Shin Pyeongtaek Power Co., Ltd. 981,387 807,107 119,162 11,847 Haeng Bok Do Si Photovoltaic Power Co., Ltd. 2,483 1,722 454 47 Dongducheon Dream Power Co., Ltd. 1,474,224 1,206,478 689,414 2,849 Jinbhuvish Power Generation Pvt. Ltd. 64,111 13,240 — — Daejung Offshore Wind Power Co., Ltd. ￦ 6,181 1,450 — (617 ) GS Donghae Electric Power Co., Ltd. 2,301,774 1,548,883 688,055 75,842 Daegu Photovoltaic Co., Ltd. 15,486 8,385 3,639 1,442 Busan Green Energy Co., Ltd. 173,537 136,857 52,256 (6,496 ) Gunsan Bio Energy Co., Ltd. 10,614 28,062 — (5,777 ) Korea Electric Vehicle Charging Service 12,810 9,013 8,428 (1,841 ) Korea Nuclear Partners Co., Ltd. 928 375 1,441 (50 ) Korea Electric Power Corporation Fund 42,162 239 127 (5,430 ) Energy Infra Asset Management Co., Ltd. 8,712 721 5,118 1,415 Daegu clean Energy Co., Ltd. 371 323 — (14 ) Yaksu ESS Co., Ltd. 7,325 5,551 1,191 363 Nepal Water & Energy Development Company Private Limited 78,309 26,783 — (1,380 ) Gwangyang Green Energy Co., Ltd. 28,816 24,164 — (1,007 ) PND solar Co., Ltd. 40,941 37,526 6,908 1,665 Hyundai Eco Energy Co., Ltd. 209,395 190,622 13,343 1,306 YeongGwang Yaksu Wind Electric Co., Ltd 46,488 45,594 6,511 (1,510 ) Green Energy Electricity Generation Co., Ltd. 33,937 36,060 — (5,923 ) Korea Energy Solutions Co., Ltd. 1,285 18 134 (233 ) ITR Co., Ltd. 376 214 167 (88 ) Structure Test Network Co., Ltd. 89 249 76 (72 ) Namjeongsusang Solar Power Operation Co., Ltd. 34,595 29,310 — (1,149 ) Indeck Niles Development, LLC 49,465 174 — (25,430 ) Indeck Niles Asset Management, LLC 271 9 1,513 753 Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 14,559 15 59 44 Suwon New Power Co., Ltd. 2,000 — — — KPGE Inc. 984 — — (6 ) Gwangbaek Solar Power Investment Co., Ltd. 193,464 183,063 7,635 (355 ) Godeok Clean Energy Co., Ltd. 3,000 — — — <Joint ventures> KEPCO-Uhde Inc. 270 7 — (107 ) Shuweihat Asia Power Investment B.V. 37,389 5 — (159 ) Shuweihat Asia Operation & Maintenance Company 2,605 45 2,570 1,892 Waterbury Lake Uranium L.P. 61,548 4 — — ASM-BG 78,191 39,439 13,200 4,894 RES Technology AD 66,821 34,325 8,384 1,914 KV Holdings, Inc. 6,101 — 25 1,876 KEPCO SPC Power Corporation ￦ 308,274 22,643 187,867 64,152 Gansu Datang Yumen Wind Power Co., Ltd. 77,313 56,941 6,106 (5,175 ) Datang Chifeng Renewable Power Co., Ltd. 765,598 302,329 122,398 40,371 Datang KEPCO Chaoyang Renewable Power Co., Ltd. 189,157 86,596 23,910 2,188 Rabigh Electricity Company 2,538,719 2,100,347 208,514 1,567 Rabigh Operation & Maintenance Company Limited 36,121 18,923 23,777 7,203 Jamaica Public Service Company Limited 1,543,049 940,609 1,035,399 32,828 KW Nuclear Components Co., Ltd. 31,326 10,820 11,305 3,837 Busan Shinho Solar Power Co., Ltd. 42,318 22,137 7,843 2,856 Global Trade Of Power System Co., Ltd. 2,993 1,025 3,323 134 Expressway Solar-light Power Generation Co., Ltd. 17,653 7,712 2,991 709 Amman Asia Electric Power Company 821,997 501,723 23,866 34,424 KAPES, Inc. 124,396 103,158 93,831 3,465 Honam Wind Power Co., Ltd. 39,680 24,703 5,365 354 Jeongam Wind Power Co., Ltd. 94,134 83,041 11,644 2,005 Korea Power Engineering Service Co., Ltd. 19,052 2,150 12,284 1,749 Chun-cheon Energy Co., Ltd. 607,823 490,375 313,438 (24,490 ) Yeonggwangbaeksu Wind Power Co., Ltd. 99,552 79,322 11,739 1,342 Nghi Son 2 Power LLC 1,589,928 1,795,578 1,008,326 71,803 Kelar S.A. 634,633 530,335 86,702 8,867 PT. Tanjung Power Indonesia 654,365 556,287 109,825 16,489 Incheon New Power Co., Ltd. 4,749 3,553 1,951 (800 ) Seokmun Energy Co., Ltd. 242,332 182,533 44,733 2,606 Daehan Wind Power PSC 89,904 86,390 — (767 ) Barakah One Company 24,330,632 24,546,421 — (112,114 ) Nawah Energy Company 120,987 119,405 — 3 Momentum 8,904 7,245 21,171 1,099 Daegu Green Power Co., Ltd. 579,593 500,092 301,339 4,899 Yeonggwang Wind Power Co., Ltd. 262,610 225,361 24,256 (2,032 ) Chester Solar IV SpA 13,443 12,079 1,590 (1,057 ) Chester Solar V SpA 4,677 4,625 519 (402 ) Diego de Almagro Solar SpA 18,984 16,901 1,954 (1,104 ) South Jamaica Power Company Limited 364,347 295,029 7,224 (35,650 ) Daesan Green Energy Co., Ltd. 232,170 183,079 — (717 ) RE Holiday Holdings LLC 331,862 247,722 18,744 (345 ) RE Pioneer Holdings LLC 246,571 184,258 12,207 (1,912 ) RE Barren Ridge 1 Holdings LLC 209,850 124,017 10,384 7,630 RE Astoria 2 Land Co LLC ￦ 11,422 217 656 651 RE Barren Ridge Land Co LLC 4,019 87 262 260 Laurel SpA 12,979 12,076 961 (1,130 ) KIAMCO KOWEPO Bannerton Hold Co Pty Ltd 32,883 425 — (232 ) Chile Solar JV SpA 69,903 186 591 1,686 Taebaek Gadeoksan Wind Power Co., Ltd. 70,270 49,500 — (1,602 ) Cheong-Song Noraesan Wind Power Co., Ltd. 51,247 40,969 — (549 ) Chester Solar I SpA 7,859 5,842 — (204 ) Solar Philippines Calatagan Corporation 98,577 47,956 18,720 11,331 Saemangeum Solar Power Co., Ltd. 13,740 3,270 — (1,875 ) Chungsongmeon BongSan wind power Co., Ltd. 27,659 24,272 — (1,365 ) Jaeun Resident Wind Power Plant Co., Ltd. 31,402 23,823 — (844 ) DE Energia SpA 64,959 50,971 1,254 (2,645 ) Dangjin Eco Power Co., Ltd. (newly) 99,907 25,436 107 (737 ) Haemodum Solar Co., Ltd. 7,237 1,237 — — Yangyang Wind Power Co., Ltd. 10,764 — — (11 ) Horus Solar, S.A. De C.V. 10,566 8,503 — (7 ) Recursos Solares PV De Mexico II, S.A. De C.V. 3,848 2,885 — 22 Sunmex Renovables, S.A. De C.V. 3,170 2,171 — 13 Stavro Holding II A.B. 28,141 13 — (18 ) (*1) The profit recognized for the years ended December 31, 2019 is reduced by the associate entity’s net income attributable to non-controlling 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 Co., Ltd. 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 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 ) 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 Co., Ltd. (formerly, Hyundai Energy Co., Ltd.) 441,875 496,355 93,832 30,269 OneEnergy Asia Limited 78,005 150 — (578 ) KAS INVESTMENT I LLC 78,410 — — — KAS INVESTMENT II LLC 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
Financial information of associates and joint ventures in consolidated financial statements	Financial information of associates and joint ventures reconciled to the Company’s investments in consolidated financial statements as of December 31, 2019 and 2020 are as follows: 2019 Investees Net assets Percentage Share in net Investment differential Intercompany transaction Others Book value In millions of won <Associates> Korea Gas Corporation ￦ 8,146,521 21.57 % 1,757,205 — — (63,238 ) 1,693,967 Korea Electric Power Industrial Development Co., Ltd. 87,562 29.00 % 25,393 — — — 25,393 YTN Co., Ltd. 185,488 21.43 % 39,747 — — — 39,747 Cheongna Energy Co., Ltd. (254 ) 43.90 % (112 ) 2,584 (1,061 ) — 1,411 Gangwon Wind Power Co., Ltd. 81,854 15.00 % 12,278 49 — — 12,327 Hyundai Green Power Co., Ltd. 428,459 29.00 % 124,253 — — — 124,253 Korea Power Exchange 260,757 100.00 % 260,757 — — (1,858 ) 258,899 Hyundai Energy Co., Ltd. (84,702 ) 46.30 % (39,217 ) — (954 ) 40,171 — Ecollite Co., Ltd. 1,534 36.10 % 554 — — (554 ) — Taebaek Wind Power Co., Ltd. 28,155 25.00 % 7,039 — — — 7,039 Taebaek Guinemi Wind Power Co., Ltd. 10,214 25.00 % 2,553 — — — 2,553 Pyeongchang Wind Power Co., Ltd. 23,508 25.00 % 5,877 — — — 5,877 Daeryun Power Co., Ltd. 289,789 9.34 % 27,066 — — (819 ) 26,247 Changjuk Wind Power Co., Ltd. 28,399 30.00 % 8,520 — — — 8,520 KNH Solar Co., Ltd. 8,824 27.00 % 2,382 — — — 2,382 SPC Power Corporation 228,085 38.00 % 86,672 — — (23,089 ) 63,583 Gemeng International Energy Co., Ltd. 1,973,217 34.00 % 670,896 — — — 670,896 PT. Cirebon Electric Power 448,818 27.50 % 123,425 — — — 123,425 KNOC Nigerian East Oil Co., Ltd. (75,959 ) 14.63 % (11,113 ) — — 11,113 — KNOC Nigerian West Oil Co., Ltd. (69,811 ) 14.63 % (10,213 ) — — 10,213 — PT Wampu Electric Power 63,815 46.00 % 29,355 — — — 29,355 PT. Bayan Resources TBK 680,061 20.00 % 136,012 385,508 — (76,379 ) 445,141 S-Power 239,597 49.00 % 117,403 — (1,619 ) — 115,784 Pioneer Gas Power Limited (58,340 ) 38.50 % (22,459 ) 22,278 — 181 — Eurasia Energy Holdings (464 ) 40.00 % (186 ) — — 186 — Xe-Pian Xe-Namnoy 296,102 25.00 % 74,026 305 (1,106 ) (290 ) 72,935 Hadong Mineral Fiber Co., Ltd. (28 ) 8.33 % (2 ) — — 2 — Green Biomass Co., Ltd. 1,379 7.85 % 108 — — — 108 PT. Mutiara Jawa 4,959 29.00 % 1,438 — — — 1,438 Samcheok Eco Materials Co., Ltd. 23,416 25.54 % 5,980 — — (5,980 ) — Noeul Green Energy Co., Ltd. 22,792 29.00 % 6,610 — — — 6,610 Naepo Green Energy Co., Ltd. (22,275 ) 41.67 % (9,281 ) 2 — 9,279 — Goseong Green Power Co., Ltd. 221,848 1.12 % 2,474 — (134 ) — 2,340 Gangneung Eco Power Co., Ltd. 158,490 1.61 % 2,553 — (123 ) — 2,430 Shin Pyeongtaek Power Co., Ltd. 174,280 40.00 % 69,712 12,800 (15,556 ) — 66,956 Haeng Bok Do Si Photovoltaic Power Co., Ltd. 761 28.00 % 213 — — 2 215 Dongducheon Dream Power Co., Ltd. 267,746 34.01 % 91,060 1,757 (3,688 ) (12,582 ) 76,547 Jinbhuvish Power Generation Pvt. Ltd. 50,871 5.16 % 2,625 — — (2,625 ) — Daejung Offshore Wind Power Co., Ltd. 4,731 49.90 % 2,361 — — — 2,361 GS Donghae Electric Power Co., Ltd. 752,891 34.00 % 255,983 — — — 255,983 Daegu Photovoltaic Co., Ltd. 7,101 29.00 % 2,060 — — — 2,060 Busan Green Energy Co., Ltd. 36,680 29.00 % 10,637 — — — 10,637 Gunsan Bio Energy Co., Ltd. (17,448 ) 18.87 % (3,292 ) — — 3,292 — Korea Electric Vehicle Charging Service 3,797 28.00 % 1,063 — — — 1,063 Korea Nuclear Partners Co., Ltd. ￦ 553 29.00 % 160 — — (160 ) — Korea Electric Power Corporation Fund 41,923 98.09 % 41,122 — — 4 41,126 Energy Infra Asset Management Co., Ltd. 7,991 9.90 % 791 — — — 791 Daegu clean Energy Co., Ltd. 48 28.00 % 13 — — — 13 Yaksu ESS Co., Ltd. 1,774 29.00 % 514 2 — — 516 Nepal Water & Energy Development Company Private Limited 51,526 58.59 % 30,173 972 — — 31,145 Gwangyang Green Energy Co., Ltd. 4,652 20.00 % 930 18 — — 948 PND solar Co., Ltd. 3,415 29.00 % 990 154 — — 1,144 Hyundai Eco Energy Co., Ltd. 18,773 19.00 % 3,567 214 — — 3,781 YeongGwang Yaksu Wind Electric Co., Ltd 894 9.63 % 86 300 — — 386 Green Energy Electricity Generation Co., Ltd. (2,123 ) 29.00 % (616 ) 779 — — 163 Korea Energy Solutions Co., Ltd. 1,267 20.00 % 253 6 — — 259 ITR Co., Ltd. 162 20.00 % 32 1 — — 33 Structure test network Co., Ltd. (160 ) 20.00 % (32 ) 53 — — 21 Namjeongsusang Solar Power Operation Co., Ltd. 5,285 15.00 % 793 19 — — 812 Indeck Niles Development, LLC 49,291 50.00 % 24,646 — — (24,646 ) — Indeck Niles Asset Management, LLC 262 33.33 % 87 — — — 87 Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 14,544 49.00 % 7,126 — — — 7,126 Suwon New Power Co., Ltd. 2,000 33.11 % 662 — — 136 798 KPGE Inc. 984 29.00 % 285 — — 2 287 Gwangbaek Solar Power Investment Co., Ltd. 10,401 19.00 % 1,976 78 — — 2,054 Go deok Clean Energy Co., Ltd. 3,000 61.00 % 1,830 — — — 1,830 <Joint ventures> KEPCO-Uhde Inc. 263 50.80 % 134 — — — 134 Shuweihat Asia Power Investment B.V. 37,384 49.00 % 18,318 — — — 18,318 Shuweihat Asia Operation & Maintenance Company 2,560 55.00 % 1,408 — — — 1,408 Waterbury Lake Uranium L.P. 61,544 33.41 % 20,562 — — — 20,562 ASM-BG 38,752 50.00 % 19,376 — — — 19,376 RES Technology AD 32,496 50.00 % 16,248 — — — 16,248 KV Holdings, Inc. 6,101 40.00 % 2,441 — — — 2,441 KEPCO SPC Power Corporation 285,631 75.20 % 214,794 — — — 214,794 Gansu Datang Yumen Wind Power Co., Ltd. 20,372 40.00 % 8,149 — — — 8,149 Datang Chifeng Renewable Power Co., Ltd. 463,269 40.00 % 185,307 — — — 185,307 Datang KEPCO Chaoyang Renewable Power Co., Ltd. 102,561 40.00 % 41,024 — — — 41,024 Rabigh Electricity Company 438,372 40.00 % 175,349 — (65,450 ) (803 ) 109,096 Rabigh Operation & Maintenance Company Limited ￦ 17,198 40.00 % 6,879 — — — 6,879 Jamaica Public Service Company Limited 602,440 40.00 % 240,976 (80,161 ) — 92,792 253,607 KW Nuclear Components Co., Ltd. 20,506 45.00 % 9,228 — — (176 ) 9,052 Busan Shinho Solar Power Co., Ltd. 20,181 25.00 % 5,045 — — — 5,045 Global Trade Of Power System Co., Ltd. 1,968 29.00 % 571 — — — 571 Expressway Solar-light Power Generation Co., Ltd. 9,941 29.00 % 2,883 — — — 2,883 Amman Asia Electric Power Company 320,274 60.00 % 192,164 — — — 192,164 KAPES, Inc. 21,238 51.00 % 10,832 — — — 10,832 Honam Wind Power Co., Ltd. 14,977 29.00 % 4,343 32 — — 4,375 Jeongam Wind Power Co., Ltd. 11,093 40.00 % 4,437 — — — 4,437 Korea Power Engineering Service Co., Ltd. 16,902 29.00 % 4,902 — — — 4,902 Chun-cheon Energy Co., Ltd. 117,448 29.90 % 35,117 — — (245 ) 34,872 Yeonggwangbaeksu Wind Power Co., Ltd. 20,230 15.00 % 3,035 5 — — 3,040 Nghi Son 2 Power LLC (205,650 ) 50.00 % (102,825 ) — — 102,825 — Kelar S.A. 104,298 65.00 % 67,794 2,668 — — 70,462 PT. Tanjung Power Indonesia 98,078 35.00 % 34,327 — — — 34,327 Incheon New Power Co., Ltd. 1,196 29.00 % 347 — — (347 ) — Seokmun Energy Co., Ltd. 59,799 29.00 % 17,342 — — — 17,342 Daehan Wind Power PSC 3,514 50.00 % 1,757 — — — 1,757 Barakah One Company (215,789 ) 18.00 % (38,842 ) — (77,254 ) 116,096 — Nawah Energy Company 1,582 18.00 % 285 — — — 285 MOMENTUM 1,659 33.33 % 553 — — — 553 Daegu Green Power Co., Ltd. 79,501 54.24 % 43,124 84 — (20,384 ) 22,824 Yeonggwang Wind Power Co., Ltd. 37,249 46.00 % 17,135 492 — — 17,627 Chester Solar IV SpA 1,364 45.00 % 614 58 — — 672 Chester Solar V SpA 52 45.00 % 23 123 — — 146 Diego de Almagro Solar SpA 2,083 45.00 % 937 98 — — 1,035 South Jamaica Power Company Limited 69,318 20.00 % 13,863 — — — 13,863 Daesan Green Energy Co., Ltd. 49,091 35.00 % 17,182 — — — 17,182 RE Holiday Holdings LLC 84,140 50.00 % 42,070 — — — 42,070 RE Pioneer Holdings LLC 62,313 50.00 % 31,156 — — — 31,156 RE Barren Ridge 1 Holdings LLC 85,833 50.00 % 42,916 — — — 42,916 RE Astoria 2 LandCo LLC 11,205 50.00 % 5,602 — — — 5,602 RE Barren Ridge LandCo LLC 3,932 50.00 % 1,966 — — — 1,966 Laurel SpA 903 45.00 % 406 189 — — 595 KIAMCO KOWEPO Bannerton Hold Co Pty Ltd 32,458 12.37 % 4,015 9 — — 4,024 Chile Solar JV SpA 69,717 50.00 % 34,859 — — — 34,859 Taebaek Gadeoksan Wind Power Co., Ltd. 20,770 37.78 % 7,846 — — — 7,846 Cheong-Song Noraesan Wind Power Co., Ltd. 10,278 29.01 % 2,982 61 — — 3,043 Chester Solar I SpA 2,017 45.00 % 908 249 — — 1,157 Solar Philippines Calatagan Corporation ￦ 50,621 38.00 % 19,236 29,694 — — 48,930 Saemangeum Solar Power Co., Ltd. 10,470 81.00 % 8,481 — — (157 ) 8,324 Chungsongmeon BongSan wind power Co., Ltd. 3,387 29.00 % 982 1,782 — — 2,764 Jaeun Resident Wind Power Plant Co., Ltd. 7,579 29.00 % 2,198 — — — 2,198 DE Energia SpA 13,988 49.00 % 6,854 — — 1,811 8,665 Dangjin Eco Power Co., Ltd. (newly) 74,471 34.00 % 25,320 341 — — 25,661 Haemodum Solar Co., Ltd. 6,000 49.00 % 2,940 — — — 2,940 Yangyang Wind Power Co., Ltd. 10,764 99.54 % 10,714 86 — — 10,800 Horus Solar, S.A. De C.V. 2,063 14.95 % 308 3,095 — — 3,403 Recursos Solares PV De Mexico II, S.A. De C.V. 963 14.95 % 144 528 — — 672 Sunmex Renovables, S.A. De C.V. 999 14.95 % 149 73 — — 222 Stavro Holding II A.B. 28,128 20.00 % 5,625 — — — 5,625 (*) The percentage of ownership shown above is after considering the treasury stocks and others. 2020 Investees Net assets Percentage of 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 solar Co., Ltd. 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 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 — 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 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. (formerly, Hyundai 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.
Unrecognized equity interest in investments in associates and joint ventures	As of December 31, 2019, and 2020, 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: 2019 2020 Unrecognized Accumulated unrecognized Unrecognized Accumulated unrecognized In millions of won Hadong Mineral Fiber Co., Ltd. ￦ — 2 — 2 Eurasia Energy Holdings 6 185 (10 ) 175 Gunsan Bio Energy Co., Ltd. 1,090 3,292 290 3,582 Daehan Wind Power PSC — — 3,855 3,855 DAYONE Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.) 12,890 38,731 (14,035 ) 24,696 Nghi Son 2 Power LLC 61,165 102,824 30,456 133,280 Samcheok Eco Materials Co., Ltd. (497 ) 788 (3 ) 785 Naepo Green Energy Co., Ltd. 9,281 9,281 (7,003 ) 2,278 Barakah One Company 116,096 116,096 (46,758 ) 69,338 Pioneer Gas Power Limited 114 114 15,824 15,938 Incheon New Power Co., Ltd. — — 194 194 Bigeum Resident Photovoltaic Power Co., Ltd. — — 116 116 KAPES, Inc. — — 3,198 3,198
Shareholders' agreements on investments in associates and joint ventures	As of December 31, 2020, 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) Jeongam Wind Power Co., Ltd. In the case where non-controlling (vi) 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. (vii) 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 (viii) 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. (ix) 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. (x) 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. (xi) 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. (xii) 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. (xiii) 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. (xiv) Hyundai Green Power Co., Ltd. As of December 31, 2020, 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.
Significant restrictions on its abilities to associates or joint ventures	Significant restrictions on the Company’s abilities on associates or joint ventures as of December 31, 2020 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. Jeongam Wind Power Co., Ltd. Dividends can only be paid when all conditions of the loan agreement are satisfied and reimbursement to the lender can be restricted depending on the priority of the loans. Also, Shares cannot be wholly or partially transferred without the consent of the stakeholders. 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 supply 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. Yeonggwangbaeksu Wind Power Co., Ltd. Dividends and settlement amount for renewable energy supply 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 supply 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 supply 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 supply 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 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.

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, plant and equipment as of December 31, 2019 and 2020 are as follows: 2019 Acquisition cost Government grants Accumulated depreciation Accumulated losses Book value In millions of won Land ￦ 13,848,063 (21,817 ) — — 13,826,246 Buildings 20,756,351 (61,920 ) (8,305,683 ) (4,962 ) 12,383,786 Structures 70,900,343 (186,554 ) (25,711,840 ) (9,633 ) 44,992,316 Machinery 89,224,339 (158,907 ) (38,865,392 ) (451,647 ) 49,748,393 Ships 3,104 — (2,903 ) — 201 Vehicles 309,829 (2,275 ) (239,128 ) (116 ) 68,310 Equipment 1,716,210 (241 ) (1,342,053 ) (42 ) 373,874 Tools 1,098,127 (403 ) (934,023 ) (40 ) 163,661 Construction-in- 28,584,806 (61,211 ) — (165,336 ) 28,358,259 Right-of-use 7,574,010 — (2,790,437 ) — 4,783,573 Asset retirement costs 11,690,188 — (4,169,238 ) (146,423 ) 7,374,527 Others 12,955,782 — (10,327,101 ) — 2,628,681 ￦ 258,661,152 (493,328 ) (92,687,798 ) (778,199 ) 164,701,827 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
Changes in property, plant and equipment	Changes in property, plant and equipment for the years ended December 31, 2019 and 2020 are as follows: 2019 Beginning balance Effect of change in accounting Acquisition Disposal Depreciation Impairment (*1,*4) Others (*2,*3) Ending balance In millions of won Land ￦ 13,554,292 — 40,752 (29,205 ) — (25,626 ) 307,850 13,848,063 (Government grants) (21,968 ) — — 151 — — — (21,817 ) Buildings 11,933,691 — 3,195 (23,409 ) (821,680 ) (1,293 ) 1,355,202 12,445,706 (Government grants) (63,189 ) — (592 ) — 6,214 — (4,353 ) (61,920 ) Structures 42,711,795 — 1,663 (470,230 ) (2,399,283 ) (1,234 ) 5,336,159 45,178,870 (Government grants) (190,854 ) — — 2,405 9,373 — (7,478 ) (186,554 ) Machinery 47,456,595 — 326,606 (248,951 ) (5,452,669 ) (12,247 ) 7,837,966 49,907,300 (Government grants) (173,242 ) — (1,050 ) 635 17,993 — (3,243 ) (158,907 ) Ships 302 — — — (100 ) — (1 ) 201 Vehicles 72,189 — 3,789 4,558 (33,650 ) — 23,699 70,585 (Government grants) (4,220 ) — (228 ) 5 2,170 — (2 ) (2,275 ) Equipment 382,859 — 47,532 (162 ) (199,376 ) (227 ) 143,489 374,115 (Government grants) (418 ) — (81 ) — 262 — (4 ) (241 ) Tools 192,675 — 20,956 (31 ) (87,708 ) — 38,172 164,064 (Government grants) (675 ) — — — 281 — (9 ) (403 ) Construction-in-progress 28,821,167 — 13,544,091 (199,853 ) — (8,828 ) (13,737,107 ) 28,419,470 (Government grants) (54,740 ) — 12,338 — — — (18,809 ) (61,211 ) Finance lease assets 195,730 (195,730 ) — — — — — — (Government grants) (26 ) 26 — — — — — — Right-of-use — 5,143,651 220,996 — (581,074 ) — — 4,783,573 Asset retirement costs 5,571,754 — — — (626,856 ) — 2,429,629 7,374,527 Others 2,359,477 — 1,388 (221 ) (800,653 ) (581 ) 1,069,271 2,628,681 ￦ 152,743,194 4,947,947 14,221,355 (964,308 ) (10,966,756 ) (50,036 ) 4,770,431 164,701,827 (*1) KEPCO Bylong Australia Pty., Ltd., 100% owned subsidiary, performed an impairment test over its land and others. The Company recognized the amount of the carrying amount in excess of its recoverable amount as an impairment loss. (*2) ‘Others’ include the amounts of assets acquired by the business combination. (see Note 51) (*3) ‘Others’ include the amounts reclassified from construction-in-progress (*4) As described in Note 2, the Company recognized impairment loss of ￦3,819 million related to Wolsong unit 1, Shin-Hanul unit 3 & 4 and reversal of impairment loss of ￦16,693 million related to Wolsong unit 1. 2020 Beginning balance 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

Investment Properties (Tables)

Investment Properties (Tables)	12 Months Ended
	Dec. 31, 2020
Investment Properties [Abstract]
Investment Properties	Investment properties as of December 31, 2019 and 2020 are as follows: 2019 Acquisition cost Government grants Accumulated depreciation Book value In millions of won Land ￦ 129,897 — — 129,897 Buildings 64,590 (13 ) (35,894 ) 28,683 ￦ 194,487 (13 ) (35,894 ) 158,580 2020 Acquisition cost Government grants Accumulated depreciation 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
Changes in investment properties	Changes in investment properties for the years ended December 31, 2019 and 2020 are as follows: 2019 Beginning Depreciation Others Ending In millions of won Land ￦ 139,940 — (10,043 ) 129,897 Buildings 19,669 (5,070 ) 14,097 28,696 (Government grants) (50 ) 1 36 (13 ) ￦ 159,559 (5,069 ) 4,090 158,580 2020 Beginning Depreciation Others Ending balance 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
Income and expenses related to investment properties	Income and expenses related to investment properties for the years ended December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Rental income ￦ 9,782 8,335 Operating and maintenance expenses related to rental income (1,257 ) (1,453 ) Operating and maintenance expenses not related to rental income (3,812 ) — ￦ 4,713 6,882
Fair value of investment properties	Fair value of investment properties as of December 31, 2019 and 2020 are as follows: 2019 2020 Book value Fair value Book value Fair value In millions of won Land ￦ 129,897 202,042 200,391 300,001 Buildings 28,683 38,046 24,804 44,597 ￦ 158,580 240,088 225,195 344,598

Construction Services Contrac_2

Construction Services Contracts (Tables)	12 Months Ended
	Dec. 31, 2020
Construction Services Contracts [Abstract]
Changes in total contract amount in which revenue is not yet recognized	Changes in total contract amount in which revenue is not yet recognized for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 Beginning balance Increase (decrease)(*) Recognized as revenue Ending balance In millions of won Nuclear power plant construction in UAE and others ￦ 4,176,595 1,186,584 (1,742,391 ) 3,620,788 (*) For the year ended December 31, 2018, the increased balance of contracts from new orders and foreign exchange impact is ￦1,207,097 million and the decreased balance of contracts due to changes in scope of construction work is ￦20,513 million. 2019 Beginning balance Increase (decrease)(*) Recognized as revenue Ending balance 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 and foreign exchange impact is ￦390,224 million and the decreased balance of contracts due to changes in scope of construction work is ￦10,955 million. 2020 Beginning balance Increase (decrease)(*) Recognized as revenue Ending balance 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 and foreign exchange impact is ￦1,512,460 million and the decreased balance of contracts due to changes in scope of construction work is ￦282,701 million.
Accumulated earned revenue, expense and others	Accumulated earned revenue, expense and others related to the Company’s construction contracts in progress as of December 31, 2019 and 2020 are as follows: 2019 Accumulated earned revenue Accumulated expense Accumulated profit Unearned advance receipts In millions of won Nuclear power plant construction in UAE and others ￦ 20,971,487 19,566,647 1,404,840 — 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
Gross amount of assets and liabilities for contract	Gross amount due from customers recognized as contract assets and due to customers recognized as contract liabilities for contract work as of December 31, 2019 and 2020 are as follows: 2019 2020 Contract Contract liabilities(*2) Contract assets(*1) Contract liabilities(*2) In millions of won Nuclear power plant construction in UAE and others ￦ 53,827 73,420 79,662 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 ￦46,489 million and ￦39,063 million, as of December 31, 2019 and 2020, respectively. (*2) Included in non-financial

Intangible Assets other than _2

Intangible Assets other than Goodwill (Tables)	12 Months Ended
	Dec. 31, 2020
Intangible Assets other than Goodwill [Abstract]
Intangible Assets other than Goodwill	Intangible assets as of December 31, 2019 and 2020 are as follows: 2019 Acquisition cost Government grants Accumulated amortization Accumulated impairment losses Book value In millions of won Software ￦ 707,731 (235 ) (542,736 ) — 164,760 Licenses and franchises 3,398 — (3,398 ) — — Copyrights, patents rights and other industrial rights 102,828 — (40,389 ) (9,178 ) 53,261 Mining rights 584,969 — (28,456 ) (512,790 ) 43,723 Development expenditures 916,834 (1,492 ) (822,972 ) (19 ) 92,351 Intangible assets under development 73,335 (11,029 ) — (12,845 ) 49,461 Usage rights of donated assets and other 582,825 — (389,664 ) — 193,161 Leasehold rights 25,989 — (20,671 ) — 5,318 Greenhouse gas emissions rights 41,656 — — — 41,656 Others 557,749 (79 ) (119,446 ) (11,939 ) 426,285 ￦ 3,597,314 (12,835 ) (1,967,732 ) (546,771 ) 1,069,976 2020 Acquisition cost Government grants Accumulated amortization Accumulated impairment losses 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
Changes in intangible assets	Changes in intangible assets for the years ended December 31, 2019 and 2020 are as follows: 2019 Beginning balance Acquisition Disposal Amortization Impairment(*1) Others(*2) Ending balance In millions of won Software ￦ 157,681 42,694 (774 ) (81,883 ) — 47,277 164,995 (Government grants) (420 ) — — 202 — (17 ) (235 ) Copyrights, patents rights and other industrial rights 67,112 171 (325 ) (9,196 ) — (4,501 ) 53,261 Mining rights 534,524 8,742 — (7,186 ) (513,519 ) 21,162 43,723 Development expenditures 92,486 687 — (28,901 ) (68 ) 29,639 93,843 (Government grants) (2,110 ) — — 833 — (215 ) (1,492 ) Intangible assets under development 70,536 56,082 — — — (66,128 ) 60,490 (Government grants) (10,564 ) — — — — (465 ) (11,029 ) Usage rights of donated assets and other 87,011 — — (15,632 ) — 121,782 193,161 (Government grants) — — — — — — — Leasehold rights 5,552 — — (741 ) — 507 5,318 Greenhouse gas emissions rights 7,050 118,743 (7,058 ) — — (77,079 ) 41,656 Others 217,084 2,307 (164 ) (14,413 ) (22 ) 221,572 426,364 (Government grants) — — — 2 — (81 ) (79 ) ￦ 1,225,942 229,426 (8,321 ) (156,915 ) (513,609 ) 293,453 1,069,976 (*1) KEPCO Australia Pty., Ltd. and KEPCO Bylong Australia Pty., Ltd., 100% owned subsidiaries, performed an impairment test over the mining rights and the Company recognized the amount of the carrying amount in excess of its recoverable amount as an impairment loss. (*2) ‘Others’ include the business rights amounting to ￦172,434 million increased from the business combination between Korea East-West Power Co., Ltd. and Eumseong Natural Gas Power Co., Ltd. 2020 Beginning Acquisition Disposal Amortization Impairment Others Ending balance 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
Significant specific intangible assets	Significant specific intangible assets as of December 31, 2019 and 2020 are as follows: 2019 Type Description Currency Amount Remaining useful lives In millions of won and thousands of Australian dollars Software ERP system and others KRW 432 1 year and 2 months ~ 1 year and 4 months Electricity sales information system KRW 4,824 3 years Copyrights, patents rights and other industrial rights Smart technology verification and standard design project conducting right KRW 6,787 2 years and 9 months Contributions to ARP NRC DC KRW 34,755 8 years Mining rights Mining rights of Bylong mine AUD — — (*) Development expenditures Electricity sales information system KRW 15,283 2 years and 3 months Usage rights of donated assets and others Sejong Haengbogdosi sharing charge KRW 31,385 6 years and 11 months Dangjin power plant load facility usage right KRW 7,870 1 year and 3 months Others Occupancy and use of public waters KRW 92,446 17 years and 1 months Business rights KRW 171,955 29 years and 11 months (*) The carrying amount of mining rights is nil, because KEPCO Australia Pty., Ltd. and KEPCO Bylong Australia Pty., Ltd. recognized impairment losses in full during the year ended December 31, 2019. 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 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.
Recognized research and development expenses	For the years ended December 31, 2018, 2019 and 2020, the Company recognized research and development expenses of ￦ 723,888 million, ￦ 735,715 million and ￦ 700,642 million, respectively.

Trade and Other Payables (Table

Trade and Other Payables (Tables)	12 Months Ended
	Dec. 31, 2020
Trade and Other Payables [Abstract]
Trade and Other Payables	Trade and other payables as of December 31, 2019 and 2020 are as follows: 2019 2020 Current Non-current Current Non-current In millions of won Trade payables ￦ 2,859,721 — 2,606,861 — Non-trade 1,952,659 2,446,714 1,785,068 2,324,965 Accrued expenses 1,028,869 2,033 1,197,815 2,038 Leasehold deposits received 2,571 709 2,336 943 Other deposits received 163,382 68,702 83,505 67,645 Lease liabilities 635,349 4,434,784 576,665 4,044,431 Dividends payable 6,851 — 4,271 — Others(*) — 12,818 — 40,390 ￦ 6,649,402 6,965,760 6,256,521 6,480,412 (*) Details of others as of December 31, 2019 and 2020 are as follows: 2019 2020 Current Non-current Current Non-current In millions of won Advance received from local governments ￦ — 5,818 — 4,278 Others — 7,000 — 36,112 ￦ — 12,818 — 40,390

Borrowings and Debt Securities

Borrowings and Debt Securities (Tables)	12 Months Ended
	Dec. 31, 2020
Borrowings and Debt Securities [Abstract]
Borrowings and Debt Securities	Borrowings and debt securities as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Current liabilities Short-term borrowings ￦ 1,098,555 1,436,922 Current portion of long-term borrowings 217,579 677,982 Current portion of debt securities 7,545,485 8,565,301 Less : Current portion of discount on long-term borrowings (1,000 ) (1,723 ) Less : Current portion of discount on debt securities (2,780 ) (3,677 ) 8,857,839 10,674,805 Non-current Long-term borrowings ￦ 3,411,052 3,018,898 Debt securities 55,716,183 56,188,234 Less : Discount on long-term borrowings (21,309 ) (14,899 ) Less : Discount on debt securities (88,920 ) (143,823 ) Add: Premium on debt securities 1,696 1,366 59,018,702 59,049,776 ￦ 67,876,541 69,724,581
Repayment schedule of borrowings and debt securities	Repayment schedule of borrowings and debt securities as of December 31, 2019 and 2020 are as follows: 2019 Type Borrowings Debt Securities In millions of won Less than 1 year ￦ 1,316,134 7,545,485 1~ 5 years 2,113,404 31,552,963 Over 5 years 1,297,648 24,163,220 ￦ 4,727,186 63,261,668 2020 Type 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
Short-term borrowings	Short-term borrowings as of December 31, 2019 and 2020 are as follows: 2019 Type Creditor Interest rate (%) Maturity Foreign currency Local currency In millions of won and thousands of foreign currencies Local short-term DB financial investment and others 2.00~2.20 2020.01.13~ 2020.02.05 — ￦ 280,000 Foreign short-term LG-CNS 4.60 2020.06.30 USD 23,699 27,439 Foreign short-term BDO Unibank 3M BVAL + 0.50 2020.12.20 PHP 225,000 5,130 Foreign short-term Mizuho Bank 4.60 2020.06.30 USD 11,027 ￦ 12,767 Electronic short-term bonds Mirae asset daewoo and others 1.72~2.20 2020.01.10~ 2020.02.05 — 400,000 Local bank overdraft Korea development Bank and others 1.98~2.75 2020.01.01~ 2020.04.16 — 373,219 ￦ 1,098,555 2020 Type Creditor Interest rate (%) Maturity Foreign currency Local currency In millions of won and thousands of foreign currencies Local short-term DB financial investment and others 0.80~4.60 2021.01.05 ~2021.12.31 — ￦ 580,004 Electronic short-term 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 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 (*) 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	Long-term borrowings as of December 31, 2019 and 2020 are as follows: 2019 Type Interest rate (%) Maturity Foreign currency Local currency In millions of won and thousands of foreign currencies Local long-term borrowings Korea Development Bank Others 0.50 2020~2044 — ￦ 3,500 Facility 2.50~4.60 2023~2028 — 59,845 Operating funds 2.33~3.04 2020~2022 — 55,000 Operating funds 1yr KoFC bond 2020~2022 — 24,000 Hana Bank Commercial Paper 3M 2021~2024 — ￦ 1,150,000 Facility 4.60 2028 — 12,466 Facility 3yr KTB rate-1.25 2020~2028 — 6,699 IBK PF Refinancing CD+1.25 2030 — 10,497 Export-Import Bank of Korea Project loans 1.50 2026 — 19,150 Operating funds 2.21 2020 — 35,000 Korea Energy Agency Development of power resources 3yr KTB rate-2.25 2023~2025 — 4,350 Facility 3yr KTB rate-2.25 2020~2024 — 2,058 Project loans — 2023 — 1,197 Others KTB rate-2.25 2024~2028 — 15,696 Shinhan Bank Facility CB rate+1.10 2028 — 18,698 Others 3.95 2035 — 99,146 Others Standard overdraft 2035 — 99,146 Kookmin Bank Facility 3.16 2020 — 10,000 Facility MOR+0.79 2023 — 23,333 Others Facility 1.75~6.80 2026~2036 — 390,044 Facility CB Standard overdraft 2023~2036 — 111,834 PF Refinancing 4.10 2030 — 29,159 Others 4.50~7.90 2022~2039 — 102,348 2,283,166 Foreign long-term borrowings Korea Energy Agency Project loans — 2021~2023 USD 8,744 10,123 Export-Import Bank of Korea and others Direct loan and others 1M 2036 USD 101,912 117,994 Direct loan and others 3M 2027 JOD 146,380 239,039 PF Loan 6M 2032 USD 118,684 137,412 Others 3.88 2021 USD 289,709 334,685 SCNT and others Shareholder’s loan 6.50~8.00 2023 USD 13,000 15,051 Shareholder’s loan 8.00 2031 JOD 4,853 7,925 Samsung Life Insurance and others Syndicated Loan 3.10 2032 JPY 4,981,038 ￦ 52,972 Woori Bank and others Syndicated Loan JPY 6M 2032 JPY 3,213,121 34,171 IFC and others Others 6M Libor+5.00 2031 PKR 37,252,930 278,652 Federal Financing Bank and others PF Loan 2.39~13.00 2031~2038 USD 101,380 117,377 Others Others — — USD 57 64 1,345,465 3,628,631 Less : Discount on long-term borrowings (22,309 ) Less : Current portion of long-term borrowings (217,579 ) Add : Current portion of discount on long-term borrowings 1,000 ￦ 3,389,743 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 Loan 3.10 2032 JPY 4,682,816 49,369 Woori Bank and others Syndicated Loan 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 Loan 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
Local debt securities	Local debt securities as of December 31, 2019 and 2020 are as follows: Issue date Maturity Interest 2019 2020 In millions of won Electricity Bonds 2011.05.06~ 2020.11.04 2021.02.08~ 2049.10.24 1.02~4.58 ￦ 28,450,000 27,810,000 Corporate Bonds(*) 2009.10.16~ 2020.12.22 2021.01.11~ 2050.12.22 1.00~6.00 24,463,577 26,463,577 52,913,577 54,273,577 Less : Discount on local debt securities (42,274 ) (46,730 ) Less : Current portion of local debt securities (6,340,000 ) (7,243,217 ) Add : Current portion of discount on local debt securities 1,409 2,108 ￦ 46,532,712 46,985,738 (*) 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.
Foreign debt securities	Foreign debt securities as of December 31, 2019 and 2020 are as follows: 2019 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 249,074 ￦ 288,379 FY-97 1997.01.31~ 1997.08.04 2027.02.01~ 2027.08.01 6.75~7.00 USD 314,717 364,379 FY-04 2004.04.23 2034.04.23 5.13 USD 286,920 332,196 FY-11 2011.07.13 2021.07.13 4.75 USD 500,000 578,900 FY-12 2012.09.19 2022.09.19 3.00 USD 750,000 868,350 FY-13 2013.09.25 2020.09.25 5.75 AUD 325,000 263,361 FY-14 2014.07.30~ 2014.12.02 2020.06.02~ 2029.07.30 2.50~3.57 USD 600,000 694,680 FY-15 2015.06.15 2025.06.15 3.25 USD 300,000 347,340 FY-16 2016.01.21 2021.07.21 2.50 USD 300,000 347,340 FY-17 2017.04.12~ 2017.07.25 2020.04.12~ 2027.07.25 2.38~3.13 USD 1,100,000 1,273,580 FY-17 2017.10.30 2037.10.30 1.70 EUR 40,000 51,897 FY-17 2017.11.16 2037.11.16 2.36 SEK 450,000 55,737 FY-18 2018.01.29~ 2018.07.25 2021.01.29~ 2023.07.25 3.00~3.88 USD 1,800,000 2,084,040 FY-18 2018.03.13 2028.03.13 3.35 HKD 1,650,000 245,289 FY-19 2019.01.22~ 2019.06.24 2022.01.22~ 2024.06.24 2.50~3.38 USD 800,000 926,240 FY-19 2019.02.27 2024.02.27 0.13 CHF 200,000 ￦ 239,104 FY-19 2019.07.19 2024.07.19~ 2027.07.19 0.00~0.05 CHF 300,000 358,656 FY-19 2019.07.22 2022.07.22 2.38 USD 300,000 347,340 FY-19 2019.10.30 2024.10.30 3M AUD 300,000 243,102 FY-19 2019.12.19 2037.12.31 3.30~5.70 USD 378,460 438,181 10,348,091 Less : Discount on foreign debt securities (49,426 ) Add : Premium on foreign debt securities 1,696 Less : Current portion of foreign debt securities (1,205,485 ) Add : Current portion of discount on foreign debt securities 1,371 ￦ 9,096,247 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
Changes in borrowings and debt securities	Changes in borrowings and debt securities for the years ended December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Beginning balance ￦ 61,034,627 67,876,541 Cash flow 6,342,074 2,538,787 Effect of exchange rate fluctuations 494,414 (640,304 ) Increase from the business combination 2,900 — Others 2,526 (50,443 ) Ending balance ￦ 67,876,541 69,724,581

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2020
Presentation of leases for lessee [Abstract]
Disclosure of quantitative information about right-of-use assets	Right-of-use 2019 Acquisition cost Accumulated depreciation Book value In millions of won Land ￦ 693,103 (49,029 ) 644,074 Buildings 54,980 (20,403 ) 34,577 Structures 28,198 (2,554 ) 25,644 Machinery 1,308 (484 ) 824 Ships 4,113,754 (425,465 ) 3,688,289 Vehicles 20,817 (7,109 ) 13,708 Others(*) 2,661,850 (2,285,393 ) 376,457 ￦ 7,574,010 (2,790,437 ) 4,783,573 (*) Including power purchase agreements (“PPA”) with GS EPS and two other LNG combined power suppliers. 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.
Disclosure of Changes in right-of-use assets	Changes in right-of-use 2019 Beginning Changes in Increase Depreciation Ending balance In millions of won Land ￦ — 684,386 8,717 (49,029 ) 644,074 Buildings — 36,874 18,106 (20,403 ) 34,577 Structures — 20,840 7,358 (2,554 ) 25,644 Machinery — — 1,308 (484 ) 824 Ships — 3,986,947 126,807 (425,465 ) 3,688,289 Vehicles — 11,258 9,559 (7,109 ) 13,708 Others — 403,346 49,141 (76,030 ) 376,457 ￦ — 5,143,651 220,996 (581,074 ) 4,783,573 (*) Including transferred amount of ￦195,704 million, which was classified as finance lease assets as of December 31, 2018. 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
Disclosure of maturity analysis of operating lease payments	Lease liabilities as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Less than 1 year ￦ 686,445 614,442 1 ~ 5 years 2,334,883 2,133,538 More than 5 years 2,735,681 2,461,557 5,757,009 5,209,537 Less : Discount (686,876 ) (588,441 ) Present value of lease payment ￦ 5,070,133 4,621,096
Disclosure of liquidity classification of lease liabilities	The details of the liquidity classification of lease liabilities as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Current lease liabilities ￦ 635,349 576,665 Non-current 4,434,784 4,044,431 ￦ 5,070,133 4,621,096
Disclosure of additional information about leasing activities for lessee	Changes in lease liabilities for the years ended December 31, 2019 and 2020 are as follows: 2019 Beginning Changes in Increase Decrease Interest Others(*) Ending In millions of won Lease liabilities ￦ 283,806 4,943,584 218,800 (659,387 ) 85,950 197,380 5,070,133 (*) Including translation effect of foreign currency lease liabilities and others. 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.
Disclosure of details of expense relating to lease contracts as lessee	Details of expense relating to lease contracts as lessee for the year ended December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Depreciation of right-of-use ￦ 581,074 586,254 Interest expenses of lease liabilities 85,950 111,782 Leases expenses for short-term leases 20,127 45,787 Leases expenses for leases of low-value 1,616 2,796 Variable lease payments (15,912 ) 33,267 ￦ 672,855 779,886
Disclosure of Profit and loss related to finance lease	Profit and loss related to finance lease for the years ended December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Finance income on the net investment in the lease ￦ 97,392 117,763
Disclosure of maturity analysis of finance lease payments receivable	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, 2019 and 2020 are as follows: 2019 2020 In millions of won Less than 1 year ￦ 173,093 162,211 1 ~ 2 years 150,895 148,485 2 ~ 3 years 150,596 144,913 3 ~ 4 years 149,364 139,605 4 ~ 5 years 145,964 136,962 More than 5 years 1,740,652 1,583,576 2,510,564 2,315,752 Less : Unearned finance income (1,331,723 ) (1,192,686 ) Net investment in the lease(*) ￦ 1,178,841 1,123,066 (*) Including the present value of unguaranteed residual value amounting to ￦15,946 million and ￦16,407 million, as of December 31, 2019 and 2020, respectively.
Changes in the allowance for doubtful accounts of finance lease receivables	Changes in the allowance for doubtful accounts of finance lease receivables for the years ended December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Beginning balance ￦ 1,133 862 Bad debt expense — 128 Reversal of allowance for doubtful accounts (271 ) — Ending balance ￦ 862 990

Employment Benefits (Tables)

Employment Benefits (Tables)	12 Months Ended
	Dec. 31, 2020
Employment Benefits [Abstract]
Employment Benefits	Employment benefit obligations as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Net defined benefit asset ￦ 1,047 7,231 Net defined benefit obligations 1,925,134 1,907,013 Other long-term employee benefit obligations 4,720 3,847
Principal assumptions on actuarial valuation	Principal assumptions on actuarial valuation as of December 31, 2019 and 2020 are as follows: 2019 2020 Discount rate 1.92%~2.05% 1.87%~2.12% Future salary and benefit levels 4.39% 4.28% Weighted average duration 10.95 years 10.77 years
Details of expense relating to defined benefit plans	Details of expense relating to defined benefit plans for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Current service cost ￦ 369,899 440,300 509,520 Interest cost 87,687 83,619 83,248 Expected return on plan assets (42,135 ) (41,597 ) (42,742 ) Past service cost — 301,442 (2,027 ) Loss from settlement (767 ) (2,017 ) — ￦ 414,684 781,747 547,999 Expenses described above are recognized in those items below in the consolidated financial statements. 2018 2019 2020 In millions of won Cost of sales ￦ 308,672 580,623 397,442 Selling and administrative expenses 51,903 120,455 94,846 Others (Construction-in-progress 54,109 80,669 55,711 ￦ 414,684 781,747 547,999 In addition, for the years ended December 31, 2018, 2019 and 2020, employee benefit obligations expenses of ￦66,833 million, ￦71,844 million and ￦60,587million, respectively, are recognized as cost of sales, and ￦13,204 million, ￦12,775 million and ￦9,121 million, respectively, are recognized as selling and administrative expenses, and ￦14,189 million, ￦13,893 million and ￦11,861 million, respectively, are recognized as construction-in-progress
Details of defined benefits	Details of defined benefit obligations as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Present value of defined benefit obligation from funded plans ￦ 4,035,400 4,570,614 Fair value of plan assets (2,111,313 ) (2,670,832 ) 1,924,087 1,899,782 Present value of defined benefit obligation from unfunded plans — — Net liabilities incurred from defined benefit plans ￦ 1,924,087 1,899,782
Changes in the present value of defined benefits	Changes in the present value of defined benefit obligations for the years ended December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Beginning balance ￦ 3,414,116 4,035,400 Current service cost 440,300 509,520 Interest cost(*) 83,619 83,248 Remeasurement component (93,736 ) 84,385 Past service cost 301,442 (2,027 ) Loss from settlement (2,018 ) — Actual payments (108,057 ) (139,956 ) Others (266 ) 44 Ending balance ￦ 4,035,400 4,570,614 (*) The Company decided to include a performance incentive for management evaluation in the average wage during the previous year and recognized it as past service cost.
Changes in the fair value of plan assets	Changes in the fair value of plan assets for the years ended December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Beginning balance ￦ 1,775,331 2,111,313 Expected return 41,597 42,742 Remeasurement component (11,186 ) (390 ) Contributions by the employers 348,386 582,275 Actual payments (42,815 ) (65,108 ) Ending balance ￦ 2,111,313 2,670,832 In addition, loss on accumulated remeasurement component amounting to ￦117,779million and ￦169,234million has been recognized as other comprehensive income or loss for the years ended December 31, 2019 and 2020, respectively.
Details of the fair value of plan assets	Details of the fair value of plan assets as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Equity instruments ￦ 189,235 253,358 Debt instruments 648,265 822,582 Bank deposit 199,743 284,655 Others 1,074,070 1,310,237 ￦ 2,111,313 2,670,832 For the years ended December 31, 2019 and 2020, actual returns on plan assets amounted to ￦30,411 million and ￦42,352 million, respectively.
Remeasurement component recognized in other comprehensive income (loss)	Remeasurement component recognized in other comprehensive income (loss) for the years ended December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Actuarial gain from changes in financial assumptions ￦ (2,916 ) (2,979 ) Experience adjustments, etc. (90,820 ) 87,364 Expected return 11,186 390 ￦ (82,550 ) 84,775

Provisions (Tables)

Provisions (Tables)	12 Months Ended
	Dec. 31, 2020
Provisions [Abstract]
Provisions	Provisions as of December 31, 2019 and 2020 are as follows: 2019 2020 Current Non-current Current Non-current In millions of won Employment benefits Provisions for employment benefits ￦ 975,619 — 1,024,574 — Litigation Litigation provisions 39,177 49,221 46,287 66,715 Decommissioning cost Nuclear plants — 15,994,039 — 16,974,884 Spent fuel 401,741 953,539 487,529 866,472 Radioactive waste 77,053 1,811,029 46,369 1,845,244 PCBs — 152,981 — 119,019 Other recovery provisions — 10,773 — 25,840 Others Power plant regional support program 140,133 — 144,272 — Transmission regional support program 139,785 — 96,895 — Provisions for financial guarantee 111 81,246 22,250 44,104 Provisions for RPS 2,889 — 9,126 — Provisions for greenhouse gas emissions obligations 682,459 — 393,121 — Others 145,754 13,220 181,241 133,294 ￦ 2,604,721 19,066,048 2,451,664 20,075,572
Changes in provisions	Changes in provisions for the years ended December 31, 2019 and 2020 are as follows: 2019 Beginning Increase in Payment Reversal Others Ending balance In millions of won Employment benefits Provisions for employment benefits ￦ 976,347 900,033 (879,980 ) (20,781 ) — 975,619 Litigation Litigation provisions 77,793 59,366 (17,236 ) (31,525 ) — 88,398 Decommissioning cost Nuclear plants 13,388,134 2,639,562 (33,657 ) — — 15,994,039 Spent fuel 1,291,354 440,029 (376,103 ) — — 1,355,280 Radioactive waste 1,685,008 209,551 (6,787 ) — 310 1,888,082 PCBs 147,668 14,251 (8,938 ) — — 152,981 Other recovery provisions 10,477 2,020 (2,033 ) — 309 10,773 Others Power plant regional support program 137,668 41,341 (48,390 ) — 9,514 140,133 Transmission regional support program 151,698 169,616 (181,529 ) — — 139,785 Provisions for tax 6,845 — — (6,847 ) 2 — Provisions for financial guarantee 15,586 83,910 (16,589 ) (1,551 ) 1 81,357 Provisions for RPS 93,919 222,119 (313,149 ) — — 2,889 Provisions for greenhouse gas emissions obligations 136,187 724,002 (152,463 ) (25,267 ) — 682,459 Others 61,862 113,751 (16,217 ) (833 ) 411 158,974 ￦ 18,180,546 5,619,551 (2,053,071 ) (86,804 ) 10,547 21,670,769 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

Government Grants (Tables)

Government Grants (Tables)	12 Months Ended
	Dec. 31, 2020
Government grants [Abstract]
Government Grants	Government grants as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Land ￦ (21,817 ) (23,475 ) Buildings (61,920 ) (57,231 ) Structures (186,554 ) (180,009 ) Machinery (158,907 ) (157,785 ) Vehicles (2,275 ) (632 ) Equipment (241 ) (227 ) Tools (403 ) (239 ) Construction-in-progress (61,211 ) (79,126 ) Investment properties (13 ) (29 ) Software (235 ) (136 ) Development expenditures (1,492 ) (5,043 ) Intangible assets under development (11,029 ) (7,203 ) Other intangible assets (79 ) (75 ) ￦ (506,176 ) (511,210 )
Changes in government Grants	Changes in government grants for the years ended December 31, 2019 and 2020 are as follows: 2019 Beginning Receipt Acquisition Offset the Disposal Others Ending In millions of won Cash ￦ — (21,705 ) — — — 21,705 — Land (21,968 ) — — — 151 — (21,817 ) Buildings (63,189 ) — — 6,214 — (4,945 ) (61,920 ) Structures (190,854 ) — — 9,373 2,405 (7,478 ) (186,554 ) Machinery (173,242 ) — — 17,993 635 (4,293 ) (158,907 ) Vehicles (4,220 ) — — 2,170 5 (230 ) (2,275 ) Equipment (418 ) — — 262 — (85 ) (241 ) Tools (675 ) — — 281 — (9 ) (403 ) Construction-in-progress (54,740 ) — 12,338 — — (18,809 ) (61,211 ) Finance lease assets (26 ) — — — — 26 — Investment properties (50 ) — — 1 — 36 (13 ) Software (420 ) — — 202 — (17 ) (235 ) Development expenditures (2,110 ) — — 833 — (215 ) (1,492 ) Intangible assets under development (10,564 ) — — — — (465 ) (11,029 ) Other intangible assets — — — 2 — (81 ) (79 ) ￦ (522,476 ) (21,705 ) 12,338 37,331 3,196 (14,860 ) (506,176 ) 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 )

Deferred Revenues (Tables)

Deferred Revenues (Tables)	12 Months Ended
	Dec. 31, 2020
Deferred Revenues [Abstract]
Deferred Revenues	Deferred revenue for the years ended December 31, 2019 and 2020 are as follows which included in current and non-current non-financial 2019 2020 In millions of won Beginning balance ￦ 8,606,563 9,201,538 Increase during the period 1,199,783 1,310,128 Recognized as revenue during the period (604,808 ) (643,477 ) Ending balance ￦ 9,201,538 9,868,189

Non-financial Liabilities (Tabl

Non-financial Liabilities (Tables)	12 Months Ended
	Dec. 31, 2020
Other Liabilities Disclosure [Abstract]
Non-financial Liabilities	Non-financial 2019 2020 Current Non-current Current Non-current In millions of won Advance received ￦ 3,825,240 192,863 3,693,043 331,596 Unearned revenue 30,988 6,589 35,068 6,122 Deferred revenue 590,928 8,610,610 625,596 9,242,593 Withholdings 160,977 10,901 257,059 9,909 Others 1,080,220 13,489 1,360,684 71,721 ￦ 5,688,353 8,834,452 5,971,450 9,661,941

Contributed Capital (Tables)

Contributed Capital (Tables)	12 Months Ended
	Dec. 31, 2020
Disclosure of classes of share capital [Abstract]
Issued Capital	Details of shares issued as of December 31, 2019 and 2020 are as follows: 2019 Shares authorized Shares issued 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. 2020 Shares authorized Shares issued 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	Details in number of outstanding capital stock for the years ended December 31, 2019 and 2020 are as follows. 2019 2020 Number of shares Beginning balance 641,964,077 641,964,077 Ending balance 641,964,077 641,964,077
Share premium	Details of share premium as of December 31, 2019 and 2020 are as follows: 2019 2020 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, 2020
Disclosure of Retained Earnings and Dividends Paid [Abstract]
Retained Earnings	Details of retained earnings as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Legal reserve(*) ￦ 1,604,910 1,604,910 Voluntary reserves 34,785,425 32,179,066 Retained earnings before appropriations 12,811,798 17,349,625 Retained earnings ￦ 49,202,133 51,133,601 (*) The KEPCO Act requires KEPCO to appropriate a legal reserve equal to at least 20 percent of net income for each accounting period until the reserve equals 50 percent of KEPCO’s common stock. The legal reserve is not available for cash dividends; however, this reserve may be credited to paid-in
Voluntary reserves	Details of voluntary reserves as of December 31, 2019 and 2020 are as follows: 2019 2020 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 28,967,976 26,361,617 Reserve for equalizing dividends 210,000 210,000 ￦ 34,785,425 32,179,066 (*) 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	Changes in retained earnings for the years ended December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Beginning balance ￦ 51,519,119 49,202,133 Profit (loss) for the period attributed to owner of the controlling Company (2,345,517 ) 1,991,347 Changes in equity method retained earnings (6,789 ) 3,181 Remeasurements of defined benefit liability, net of tax 36,160 (62,857 ) Transfer of gain (loss) on valuation of financial assets through other comprehensive income (840 ) — Transactions between consolidated entities — (203 ) Ending balance ￦ 49,202,133 51,133,601
Dividends Paid	Dividends paid for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 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 ￦ 790 507,152 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 ￦ — —
Changes in retained earnings of investments in associates and joint ventures	Changes in retained earnings of investments in associates and joint ventures for the years ended December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Beginning balance ￦ 3,969 (2,820 ) Changes (6,789 ) 3,181 Ending balance ￦ (2,820 ) 361
Changes in retained earnings of remeasurement components	Changes in remeasurement components related to defined benefit liability for the years ended December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Beginning balance ￦ (219,381 ) (117,779 ) Changes 76,395 (77,828 ) Income tax effect (40,235 ) 14,971 Transfer to reserve for business expansion 65,442 11,402 Ending balance ￦ (117,779 ) (169,234 )

Statement of Appropriation of_2

Statement of Appropriation of Retained Earnings (Tables)	12 Months Ended
	Dec. 31, 2020
Statement of Appropriation of Retained Earnings [Abstract]
Statement of Appropriation of Retained Earnings	For the year ended December 31, 2019, KEPCO’s deficits were appropriated on March 27, 2020. For the year ended December 31, 2020, KEPCO’s retained earnings are expected to be disposed on March 25, 2021. Statements of disposition of deficit and appropriation of retained earnings of KEPCO, the controlling company, for the years ended December 31, 2019 and 2020, respectively, are as follows: 2019 2020 In millions of won except for I.   Retained earnings before appropriations (undisposed deficit) Unappropriated retained earnings carried over from prior years ￦ — — Net income (loss) (2,594,957 ) 1,951,498 Remeasurements of the defined benefit plan (11,402 ) (67,119 ) (2,606,359 ) 1,884,379 II. Transfer from voluntary reserves 2,606,359 — III.  Subtotal (I+II) — 1,884,379 IV.  Appropriations of retained earnings (Disposition of deficit) Legal reserve — — Dividends (government, individual) (Amount of dividends per share (%) : Current year – ￦1,216 (24.32%) Prior year – ￦0 (0%)) — (780,628 ) Reserve for business expansion — (1,103,751 ) — (1,884,379 ) V. Unappropriated retained earnings to be carried over forward to subsequent year — —

Hybrid Bonds (Tables)

Hybrid Bonds (Tables)	12 Months Ended
	Dec. 31, 2020
Hybrid Bonds [Abstract]
Hybrid Bonds	Hybrid bonds classified as equity (non-controlling Issuer Hybrid bond Issued date Maturity Yield (%) 2019 2020 In millions of won Korea South-East Power Co., Ltd. 1st hybrid bond 2012.12.07 2042.12.06 4.38 ￦ 170,000 170,000 Korea South-East Power Co., Ltd. 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, 2020
Other Components of Equity [Abstract]
Other Components of Equity	Other components of equity of the parent as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Other capital surplus ￦ 1,226,364 1,224,105 Accumulated other comprehensive income (loss) (280,730 ) (409,577 ) Other equity 13,294,973 13,294,973 ￦ 14,240,607 14,109,501
Changes in other capital surplus	Changes in other capital surplus for the years ended December 31, 2019 and 2020 are as follows: 2019 2020 Gains on treasury stocks Others Subtotal Gains on disposal of treasury stocks Others Subtotal In millions of won Beginning balance ￦ 387,524 847,301 1,234,825 387,524 838,840 1,226,364 Issuance of share capital of subsidiary — — — — (148 ) (148 ) Others — (8,461 ) (8,461 ) — (2,111 ) (2,111 ) Ending balance ￦ 387,524 838,840 1,226,364 387,524 836,581 1,224,105
Changes in accumulated other comprehensive income (loss)	2019 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 ￦ (81,708 ) 123,553 (350,245 ) (50,170 ) (358,570 ) Changes in the unrealized fair value of financial assets at FVOCI, net of tax (10,891 ) — — — (10,891 ) Shares in other comprehensive income of associates and joint ventures, net of tax — 19,343 — — 19,343 Foreign currency translation of foreign operations, net of tax — — 55,347 — 55,347 Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax — — — 14,041 14,041 Ending balance ￦ (92,599 ) 142,896 (294,898 ) (36,129 ) (280,730 ) 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 )
Changes in other equity	Other equity as of December 31, 2019 and 2020 are as follows: 2019 2020 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, 2020
Revenue [Abstract]
Sales	Details of sales for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 Domestic Overseas Domestic Overseas Domestic Overseas In millions of won [Type of goods and services] Sales of goods ￦ 57,514,866 382,938 56,609,330 285,546 56,380,608 303,704 Electricity 56,842,011 — 55,939,001 — 55,730,985 — Heat supply 216,117 — 220,948 — 198,715 — Others 456,738 382,938 449,381 285,546 450,908 303,704 Sales related to rendering of services 176,539 216,328 222,106 186,184 223,075 206,275 Sales of construction services 108,586 1,633,805 110,692 1,154,224 170,895 641,280 ￦ 57,799,991 2,233,071 56,942,128 1,625,954 56,774,578 1,151,259 [Timing of revenue recognition] Performance obligations satisfied at a point in time ￦ 57,514,866 382,938 56,609,330 285,546 56,380,608 303,704 Performance obligations satisfied over time 285,125 1,850,133 332,798 1,340,408 393,970 847,555 ￦ 57,799,991 2,233,071 56,942,128 1,625,954 56,774,578 1,151,259

Selling and Administrative Ex_2

Selling and Administrative Expenses (Tables)	12 Months Ended
	Dec. 31, 2020
Selling, general and administrative expense [Abstract]
Selling and Administrative Expenses	Selling and administrative expenses for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Salaries ￦ 757,819 775,204 1,095,183 Retirement benefit expense 65,107 157,272 103,967 Welfare and benefit expense 132,089 120,463 155,071 Insurance expense 12,181 12,427 10,178 Depreciation 214,499 232,510 218,103 Amortization of intangible assets 54,153 76,547 87,086 Bad debt expense 39,784 (12,719 ) 20,648 Commission 714,096 632,849 368,275 Advertising expense 30,894 34,453 29,559 Training expense 6,277 7,174 5,196 Vehicle maintenance expense 10,148 9,525 9,435 Publishing expense 3,307 3,414 3,677 Business promotion expense 2,785 3,038 3,614 Rent expense 42,851 40,505 36,337 Telecommunication expense 23,505 8,451 8,686 Transportation expense 686 865 1,007 Taxes and dues 46,424 58,666 62,828 Expendable supplies expense 6,166 6,682 8,029 Water, light and heating expense 12,629 11,867 11,749 Repairs and maintenance expense 62,580 88,576 79,185 Ordinary development expense 215,494 224,463 197,436 Travel expense 14,363 15,652 10,793 Clothing expense 10,108 9,369 14,834 Survey and analysis expense 705 848 826 Membership fee 1,043 969 1,274 Others 148,197 150,506 135,467 ￦ 2,627,890 2,669,576 2,678,443
Other selling and administrative expenses	Details of “others” included in selling and administrative expenses for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Accommodation development expenses ￦ 52,822 53,945 30,889 Miscellaneous wages 32,447 39,794 45,887 Litigation and filing expenses 12,853 21,768 19,341 Compensation for damages 19,193 (1,924 ) 8,374 Outsourcing expenses 3,036 3,293 3,610 Reward expenses 2,713 2,858 3,228 Overseas market development expenses 1,361 1,997 1,218 Others 23,772 28,775 22,920 ￦ 148,197 150,506 135,467

Other Income and Expense (Table

Other Income and Expense (Tables)	12 Months Ended
	Dec. 31, 2020
Disclosure of other operating income (expense) [Abstract]
Other Income	Other income for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Reversal of other provisions ￦ 12,700 16,542 25,826 Reversal of other allowance for doubtful accounts 143 — 2,465 Gains on government grants 482 281 269 Gains on assets contributed 17,336 6,921 24,324 Gains on liabilities exempted 10,303 916 1,314 Compensation and reparations revenue 89,901 113,292 95,407 Revenue from research contracts 6,818 5,276 4,001 Income related to transfer of assets from customers 594,548 604,808 643,477 Rental income 186,631 191,088 193,567 Others 51,032 58,849 45,798 ￦ 969,894 997,973 1,036,448
Details of others of other income	Details of “others” included in other income for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Refund of claim for rectification ￦ 8,933 1,969 11,880 Adjustment of research project 2,267 3,294 2,150 Maintenance expenses on lease building 176 153 2,785 Training expenses 3,220 3,167 3,852 Deposit redemption 7 436 314 Reversal of expenses on litigation 753 9,926 620 Revenue on royalty fee 6,909 — — Reimbursement of insurance fee 7,145 610 22 Gains on guarantee contracts 39 135 134 Others 21,583 39,159 24,041 ￦ 51,032 58,849 45,798
Other Expense	Other expenses for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Compensation and indemnification expense ￦ 23,437 403 11,959 Accretion expenses of other provisions 41,924 7,939 17,991 Depreciation expenses on investment properties 923 5,069 1,453 Depreciation expenses on idle assets 6,547 6,542 6,604 Other bad debt expense 17,827 29,348 32,503 Donations 63,743 64,752 316,981 Others 76,929 127,860 30,229 ￦ 231,330 241,913 417,720
Details of others of other expense	Details of “others” included in other expenses for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Operating expenses related to the idle assets ￦ 47 49 46 Research grants 461 399 91 Supporting expenses on farming and fishing village 13,537 13,991 16,115 Operating expenses on fitness center 4,788 5,234 5,101 Expenses on adjustment of research and development grants 404 554 720 Taxes and dues 199 188 253 Expenses on R&D supporting 53 67 242 Others 57,440 107,378 7,661 ￦ 76,929 127,860 30,229

Other Gains (Losses) (Tables)

Other Gains (Losses) (Tables)	12 Months Ended
	Dec. 31, 2020
Other Gains (Losses) [Abstract]
Other Gains (Losses)	Composition of other gains (losses) for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Other gains Gains on disposal of property, plant and equipment ￦ 98,077 43,784 93,195 Gains on disposal of intangible assets 12 206 1,556 Reversal of impairment loss on property, plant and equipment — 16,692 7,805 Reversal of impairment loss on intangible assets 17 — — Gains on foreign currency translation 14,905 16,340 8,917 Gains on foreign currency transaction 47,297 53,152 61,865 Gains on insurance proceeds — 17,410 43,800 Others 221,556 238,688 322,379 Other losses Losses on disposal of property, plant and equipment (60,704 ) (72,508 ) (162,725 ) Losses on disposal of intangible assets (43 ) (827 ) (392 ) Losses on valuation of other non-current — — (241 ) Impairment loss on property, plant and equipment (710,162 ) (50,034 ) (80,413 ) Impairment loss on intangible assets (8,112 ) (513,609 ) (3,599 ) Impairment loss on other non-current (87,024 ) (49,620 ) — Losses on foreign currency translation (7,678 ) (8,757 ) (17,664 ) Losses on foreign currency transaction (65,366 ) (55,283 ) (49,694 ) Others (63,899 ) (217,892 ) (189,695 ) ￦ (621,124 ) (582,258 ) 35,094
Details of others of other gains	Details of “others” included in other gains for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Gains on disposal of inventories ￦ 6,350 3,424 3,373 Gains on proxy collection of TV license fee 40,450 41,013 41,438 Gains on compensation of impaired electric poles 1,166 1,372 978 Gains on compensation for infringement on contract 3,648 — — Gains on harbor facilities dues 3,803 3,741 2,231 Gains on technical fees 2,026 3,044 4,826 Reversal of occupation development training fees 1,602 1,472 352 Gains on disposal of waste 4,232 5,317 6,927 Gains on insurance 22,382 812 — Gains on tax rebate 542 341 772 Gains on other commission 4,347 1,111 1,643 Gains on disposal of assets held-for-sale — 23,778 — Others 131,008 153,263 259,839 ￦ 221,556 238,688 322,379
Details of others of other losses	Details of “others” included in other losses for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Losses on valuation of inventories ￦ 1,953 3,127 4,998 Losses on disposal of inventories 3,555 10,456 37,644 Losses due to disaster 2,129 7,635 16,814 Losses on rounding adjustment of electric charge surtax 1,265 1,268 1,276 Others 54,997 195,406 128,963 ￦ 63,899 217,892 189,695

Finance Income (Tables)

Finance Income (Tables)	12 Months Ended
	Dec. 31, 2020
Finance income [Abstract]
Finance Income	Finance income for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Interest income ￦ 223,767 268,118 242,586 Dividends income 12,777 13,838 7,316 Gains on disposal of financial assets 1,838 3,866 11,992 Gains on valuation of financial assets at fair value through profit or loss 8,495 5,575 12,904 Gains on valuation of derivatives 199,943 362,735 57,563 Gains on transaction of derivatives 179,745 157,961 146,448 Gains on foreign currency translation 143,254 175,839 1,005,961 Gains on foreign currency transactions 27,051 21,774 24,009 Other financial assets — — 1,470 ￦ 796,870 1,009,706 1,510,249
Interest Income	Details of interest income included in finance income for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Cash and cash equivalents ￦ 40,704 42,861 9,419 Financial assets at fair value through profit or loss 21,713 29,411 19,114 Financial assets at amortized cost 89 539 612 Loans 21,925 63,448 26,232 Short-term financial instrument 41,025 49,070 25,540 Long-term financial instrument 7,920 12,794 10,406 Other financial assets 1 54 228 Trade and other receivables 90,390 69,941 151,035 ￦ 223,767 268,118 242,586

Finance Expenses (Tables)

Finance Expenses (Tables)	12 Months Ended
	Dec. 31, 2020
Finance Expenses [Abstract]
Finance Expenses	Finance expenses for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Interest expense ￦ 1,868,458 2,046,811 1,995,425 Losses on sale of financial assets 1 2,106 648 Losses on valuation of financial assets at fair value through profit or loss 6,616 4,513 7,396 Losses on valuation of derivatives 46,740 45,385 513,278 Losses on transaction of derivatives 32,448 71,546 81,055 Losses on foreign currency translation 393,859 553,731 215,047 Losses on foreign currency transaction 121,763 55,509 79,103 Losses on repayment of financial liabilities — — 35 Other 858 2,555 4,456 ￦ 2,470,743 2,782,156 2,896,443
Interest Expenses	Details of interest expense included in finance expenses for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Trade and other payables ￦ 42,830 94,019 88,757 Short-term borrowings 32,545 42,971 29,358 Long-term borrowings 92,243 119,806 118,678 Debt securities 1,771,544 1,827,511 1,805,253 Other financial liabilities 505,112 558,464 540,867 2,444,274 2,642,771 2,582,913 Less: Capitalized borrowing costs (575,816 ) (595,960 ) (587,488 ) ￦ 1,868,458 2,046,811 1,995,425

Income tax expense (Tables)

Income tax expense (Tables)	12 Months Ended
	Dec. 31, 2020
Income tax expense (benefit) [Abstract]
Income tax expense	Income tax expense (benefit) for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Current income tax expense Payment of income tax ￦ 378,715 538,223 671,179 Adjustment in respect of prior years due to change in estimate (195,648 ) (176,441 ) (63,756 ) Current income tax directly recognized in equity 101,528 (53,302 ) 51,486 Effect of change in accounting policy 1,780 — — 286,375 308,480 658,909 Deferred tax expense (benefit) Generation and realization of temporary differences ￦ (495,658 ) (636,984 ) (77,985 ) Changes of unrecognized tax losses, tax credit and temporary differences for prior periods (28,509 ) (22,469 ) (10,471 ) Changes in deferred tax on tax losses carryforwards (572,305 ) (582,011 ) 296,070 Tax credit carryforwards (16,224 ) (71,306 ) 32,541 Amount due to change in tax rate or regulations — 1,987 — (1,112,696 ) (1,310,783 ) 240,155 Income tax expense (benefit) ￦ (826,321 ) (1,002,303 ) 899,064
Reconciliation between actual income tax expense and amount computed by applying the statutory tax rate	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, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Profit (loss) before income tax ￦ (2,000,819 ) (3,265,838 ) 2,991,533 Income tax expense (benefit) computed at applicable tax rate(*1) (550,225 ) (898,105 ) 822,672 Adjustments Effect of applying gradual tax rate (1,408 ) 10,362 (10,362 ) Effect of non-taxable (1,705 ) (9,990 ) (13,593 ) Effect of non-deductible 40,151 12,197 46,776 Effect of tax losses that are not recognized as deferred tax asset 2,086 57,490 — Effects of tax credits and deduction (39,471 ) (76,983 ) (63,753 ) Recognition (reversal) of unrecognized deferred tax asset, net (28,509 ) (22,469 ) (10,471 ) Effect of change in deferred tax due to change in tax rate 261 16,848 (17,590 ) Deduction of deferred tax assets — — 55,682 Deferred tax related to investments in subsidiaries, associates and joint ventures (52,618 ) 147,598 102,137 Others, net 765 (62,810 ) 51,322 (80,448 ) 72,243 140,148 Adjustment in respect of prior years due to change in estimate (195,648 ) (176,440 ) (63,756 ) Income tax expense (benefit) ￦ (826,321 ) (1,002,302 ) 899,064 Effective tax rate ( *2) ( *2) 30.05 % (*1) Applicable tax rate is 27.5% as of December 31, 2018, 2019 and 2020. (*2) The effective tax rate for the year ended December 31, 2018 and 2019 is not calculated due to income tax benefit.
Income tax directly adjusted to shareholders' equity (except for accumulated other comprehensive income (loss))	Income tax directly adjusted to equity (except for accumulated other comprehensive income (loss)) for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 In millions of won Dividends of hybrid bond ￦ 4,273 3,432 4,273
Income tax recognized as other comprehensive income (loss)	Income tax recognized as other comprehensive income (loss) for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 2019 2020 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 ￦ 35,798 (4,217 ) 19,447 Net change in the unrealized fair value of derivatives using cash flow hedge accounting 6,639 (15,642 ) (47,231 ) Remeasurement of defined benefit liability 53,703 (40,235 ) 14,972 Investments in associates 6,592 4,275 35,714 Others (5,477 ) (914 ) 24,311 ￦ 97,255 (56,733 ) 47,213
Changes in deferred income tax assets (liabilities)	2019 Beginning balance Amounts recognized in profit or loss Amount recognized in other comprehensive income (loss) Amounts recognized directly in equity Others (*) Ending balance In millions of won Deferred tax on temporary differences Employee benefits ￦ 594,541 94,541 (40,235 ) — — 648,847 Cash flow hedge 39,461 (23,977 ) (15,642 ) (841 ) — (999 ) Investments in associates and subsidiaries (8,666,871 ) (3,131 ) 4,275 — — (8,665,727 ) Property, plant and equipment (6,522,778 ) (592,440 ) — — — (7,115,218 ) Finance lease ￦ (453,074 ) 292,631 — — — (160,443 ) Intangible assets 6,055 (20,232 ) — — (41,729 ) (55,906 ) Financial assets at fair value through profit or loss 19 322 — — — 341 Financial assets at fair value through other comprehensive income 25,576 (3,114 ) (4,217 ) — — 18,245 Deferred revenue 219,742 (6,739 ) — — — 213,003 Provisions 4,800,946 655,973 — — — 5,456,919 Doubtful receivables 59 — — — — 59 Other financial liabilities 39,493 (4,402 ) — 4,273 — 39,364 Gains or losses on foreign exchange translation 27,080 30,881 — — — 57,961 Allowance for doubtful accounts 58,756 (1,149 ) — — — 57,607 Accrued income (2,914 ) (1,462 ) — — — (4,376 ) Special deduction for property, plant and equipment (211,746 ) (3,627 ) — — — (215,373 ) Others 1,053,146 290,484 (914 ) — — 1,342,716 (8,992,509 ) 704,559 (56,733 ) 3,432 (41,729 ) (8,382,980 ) Deferred tax on unused tax losses and tax credit Unused tax losses 554,457 557,356 — — — 1,111,813 Excess of donation limit 17,848 18,847 — — — 36,695 Tax credit 36,656 70,870 — — — 107,526 608,961 647,073 — — — 1,256,034 ￦ (8,383,548 ) 1,351,632 (56,733 ) 3,432 (41,729 ) (7,126,946 ) (*) ‘Others’ include amount changed due to business combination. (see Note 51) 2020 Beginning balance Amounts or loss 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 associates and subsidiaries (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 financial 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 )
Deferred income tax assets (liabilities)	Deferred tax assets (liabilities) recognized in the consolidated statements of financial position as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Deferred tax assets ￦ 1,437,829 1,733,146 Deferred tax liabilities (8,564,775 ) (9,100,247 ) ￦ (7,126,946 ) (7,367,101 )
Details of deductible temporary differences, tax losses and unused tax credits for which no deferred income tax assets were recognized	Details of deductible temporary differences, tax losses and unused tax credits for which no deferred tax assets were recognized as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Deductible temporary differences ￦ 541,449 1,405,621

Assets Held-for-Sale (Tables)

Assets Held-for-Sale (Tables)	12 Months Ended
	Dec. 31, 2020
Assets Held-for-Sale [Abstract]
Assets Held-for-Sale	Assets held-for-sale 2019 2020 In millions of won Land ￦ 23,002 — Buildings 193 1 Investments 4,921 — Others(*) — 924 ￦ 28,116 925 (*) As DG Fairhaven Power, LLC were sold after the end of the reporting period, the assets of DG Fairhaven Power, LLC were classified as assets held-for-sale.

Expenses Classified by Nature (

Expenses Classified by Nature (Tables)	12 Months Ended
	Dec. 31, 2020
Expenses Classified by Nature [Abstract]
Expenses Classified by Nature	Expenses classified by nature for the years ended December 31, 2018, 2019 and 2020 are as follows: 2018 Selling and Cost of sales Total In millions of won Raw materials used ￦ — 19,537,928 19,537,928 Salaries 757,819 3,478,804 4,236,623 Retirement benefit expense 65,107 375,505 440,612 Welfare and benefit expense 132,089 464,483 596,572 Insurance expense 12,181 93,876 106,057 Depreciation 214,499 9,683,887 9,898,386 Amortization of intangible assets 54,153 64,785 118,938 Bad debt expense 39,784 — 39,784 Commission 714,096 475,188 1,189,284 Advertising expense 30,894 9,419 40,313 Training expense 6,277 14,096 20,373 Vehicle maintenance expense 10,148 7,809 17,957 Publishing expense 3,307 3,530 6,837 Business promotion expense 2,785 3,860 6,645 Rent expense 42,851 171,132 213,983 Telecommunication expense 23,505 82,568 106,073 Transportation expense 686 4,537 5,223 Taxes and dues 46,424 440,317 486,741 Expendable supplies expense 6,166 31,844 38,010 Water, light and heating expense 12,629 34,640 47,269 Repairs and maintenance expense 62,580 2,156,668 2,219,248 Ordinary development expense 215,494 508,394 723,888 Travel expense 14,363 67,064 81,427 Clothing expense 10,108 4,368 14,476 Survey and analysis expense 705 3,929 4,634 Membership fee 1,043 11,563 12,606 Power purchase — 18,307,289 18,307,289 Others 148,197 2,170,238 2,318,435 ￦ 2,627,890 58,207,721 60,835,611 2019 Selling and Cost of sales 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 administrative expenses Cost of sales 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

Earnings per share (Tables)

Earnings per share (Tables)	12 Months Ended
	Dec. 31, 2020
Earnings per share [Abstract]
Basic earnings per share	Basic earnings (loss) per share for the years ended December 31, 2018, 2019 and 2020 are as follows: Type 2018 2019 2020 In won Basic earnings (loss) per share ￦ (2,048 ) (3,654 ) 3,102
Diluted earnings per share	Diluted earnings (loss) per share for the years ended December 31, 2018, 2019 and 2020 are as follows: Type 2018 2019 2020 In won Diluted earnings (loss) per share ￦ (2,048 ) (3,654 ) 3,102
Calculation of Basic earnings 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, 2018, 2019 and 2020 are as follows: Type 2018 2019 2020 In millions of won except number of shares Profit (loss) attributable to owners of the controlling company ￦ (1,314,567 ) (2,345,517 ) 1,991,347 Profit (loss) used in the calculation of total basic earnings (loss) per share (1,314,567 ) (2,345,517 ) 1,991,347 Weighted average number of common shares 641,964,077 641,964,077 641,964,077
Calculation of Diluted earnings per share	Earnings (loss) used in the calculation of total diluted earnings (loss) per share for the years ended December 31, 2018, 2019 and 2020 are as follows: Type 2018 2019 2020 In millions of won Profit (loss) used in the calculation of total diluted earnings (loss) per share ￦ (1,314,567 ) (2,345,517 ) 1,991,347 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, 2018, 2019 and 2020 are as follows: Type 2018 2019 2020 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, 2020
Risk Management [Abstract]
Capital risk management	Details of the Company’s capital management accounts as of December 31, 2019 and 2020 are as follows: 2019 2020 In millions of won Total borrowings and debt securities ￦ 67,876,541 69,724,581 Cash and cash equivalents 1,810,129 2,029,584 Net borrowings and debt securities 66,066,412 67,694,997 Total equity 68,889,649 70,666,846 Debt to equity ratio 95.90 % 95.79 %
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, 2019 and 2020 are as follows: 2019 2020 In millions of won Cash and cash equivalents ￦ 1,810,129 2,029,584 Financial assets at fair value through profit or loss(*1) 747,261 1,808,404 Derivative assets (trading) 165,204 110,764 Financial assets at amortized cost 13,609 14,422 Loans 738,707 790,162 Long-term/short-term financial instruments 1,960,227 2,062,103 Derivative assets (applying hedge accounting) 145,829 55,649 Trade and other receivables 9,703,749 9,780,039 Financial guarantee contracts(*2) 3,338,566 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.
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, 2019 and 2020 are as follows: 2019 2020 Type Accounts 1% Increase 1% Decrease 1% Increase 1% Decrease In millions of won Future salary increases Increase (decrease) in defined benefit obligation ￦ 442,748 (386,147 ) 488,087 (425,708 ) Discount rate Increase (decrease) in defined benefit obligation (402,099 ) 475,765 (443,527 ) 524,856 Changes of employee benefits assuming a 1% increase and decrease movements in discount rate on plan asset for the years ended December 31, 2019 and 2020 are ￦17,734 million and ￦20,960 million, respectively.
Changes in provisions due to movements in underlying assumptions	Changes in provisions due to movements in underlying assumptions as of December 31, 2019 and 2020 are as follows: Type Accounts 2019 2020 PCBs Inflation rate 1.09 % 1.06 % Discount rate 1.97 % 1.83 % Nuclear plants Inflation rate 1.10 % 1.07 % Discount rate 2.43 % 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, 2019 and 2020 are as follows: 2019 2020 Type Accounts 0.1% Increase 0.1% Decrease 0.1% Increase 0.1% Decrease In millions of won Discount rate PCBs ￦ (527 ) 530 (292 ) 293 Nuclear plants (316,184 ) 325,828 (326,926 ) 336,928 Spent fuel (51,607 ) 53,621 (51,558 ) 53,571 Inflation rate PCBs 534 (532 ) 295 (294 ) Nuclear plants 346,082 (336,182 ) 357,676 (347,450 ) Spent fuel 54,396 (52,424 ) 54,345 (52,375 )
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, 2019 and 2020 are as follows: Assets Liabilities Type 2019 2020 2019 2020 In thousands of foreign currencies AED 57,403 39,678 40,061 31,594 AUD 143 133 1,036,785 707,538 BDT 85,547 93,442 635 — BWP 1,437 890 — — EGP — — — 948 CAD 86 247 3,112 1,840 CHF — — 500,753 500,406 CNY — — 26,140 — CZK — — 243 2,033 EUR 208 310 111,199 121,069 GBP — — 191 43 HKD — — 1,648,815 1,651,839 IDR 376,136 342,496 219,801 555,241 INR 1,244,170 1,231,895 210,232 155,134 JOD 1,516 1,673 147 — JPY 109,970 825,269 314,402 484,585 KZT 319 1,510 — — MGA 3,858,201 5,645,349 133,403 — MMK 29,651 11,032 — — PHP 175,210 191,122 130,073 104,161 PKR 354,361 371,328 4,366 12,222 SAR 2,653 2,178 480 — SEK — — 449,072 449,824 USD 1,227,054 1,445,522 9,963,928 12,234,563 UYU 58,781 78,265 8,213 1,585 VND 418,998 672,563 1,375 — ZAR 450 303 6 —
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, 2019 and 2020 are as follows: 2019 2020 Type 10% Increase 10% Decrease 10% Increase 10% Decrease In millions of won Increase (decrease) of profit before income tax ￦ (1,197,530 ) 1,197,530 (1,336,821 ) 1,336,821 Increase (decrease) of equity(*) (1,197,530 ) 1,197,530 (1,336,821 ) 1,336,821 (*) 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, 2019 and 2020 are as follows: Type 2019 2020 In millions of won Short-term borrowings ￦ — 171,518 Long-term borrowings 2,273,579 2,191,322 Debt securities 243,102 250,968 ￦ 2,516,681 2,613,808
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, 2019 and 2020 are as follows: 2019 2020 Type 1% Increase 1% Decrease 1% Increase 1% Decrease In millions of won Increase (decrease) of profit before income tax ￦ (25,167 ) 25,167 (26,138 ) 26,138 Increase (decrease) of shareholder’s equity (*) (25,167 ) 25,167 (26,138 ) 26,138 (*) 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, 2019 and 2020 is as follows: 2019 2020 Type 1% Increase 1% Decrease 1% Increase 1% Decrease In millions of won Increase (decrease) of profit before income tax ￦ 559,390 (559,390 ) 557,310 (557,310 ) Increase (decrease) of shareholder’s equity(*) 559,390 (559,390 ) 557,310 (557,310 ) (*) The effect on the equity excluding the impact of income taxes.
Details of maturities of non-derivative financial liabilities	2019 Type Less than 1 year 1~2 Years 2~5 Years More than 5 years Total In millions of won Borrowings and debt securities ￦ 10,660,737 10,997,510 27,881,873 30,859,669 80,399,789 Finance lease liabilities 686,445 617,449 1,717,434 2,735,681 5,757,009 Trade and other payables 6,014,054 382,809 971,469 1,176,697 8,545,029 Financial guarantee contracts(*) 937,091 302,186 32,314 2,066,975 3,338,566 ￦ 18,298,327 12,299,954 30,603,090 36,839,022 98,040,393 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 (*) This represents the total guarantee amounts associated with the financial guarantee contracts. Financial guarantee liabilities which are recognized as of December 31, 2019 and 2020 are ￦81,357 million and ￦66,354 million, respectively.
The expected maturities for non-derivative financial assets	The expected maturities for non-derivative 2019 Type Less than 1 year 1~5 Years More than 5 years Other (*) Total In millions of won Cash and cash equivalents ￦ 1,810,129 — — — 1,810,129 Financial assets at fair value through other comprehensive income — — — 379,170 379,170 Financial assets at amortized cost 12,302 1,307 — — 13,609 Loans 64,081 346,583 336,502 27,606 774,772 Long-term/short-term financial instruments 1,351,971 269,863 — 338,393 1,960,227 Financial assets at fair value through profit or loss 131,385 79 — 615,797 747,261 Trade and other receivables 7,703,746 980,951 818,431 207,979 9,711,107 ￦ 11,073,614 1,598,783 1,154,933 1,568,945 15,396,275 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 (*) 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, 2019 and 2020 are as follows: 2019 Type Less than 1 year 1~2 Years 2~5 Years More than 5 years Total In millions of won Net settlement —Trading ￦ (3,017 ) — — — (3,017 ) Gross settlement —Trading (15,011 ) (8,295 ) (39,654 ) 4,235 (58,725 ) —Hedging (59,846 ) (21,466 ) (1,914 ) (33,588 ) (116,814 ) ￦ (77,874 ) (29,761 ) (41,568 ) (29,353 ) (178,556 ) 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 )
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, 2019 and 2020 are as follows: 2019 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 21 43,931 72,386 56,315 172,653 —Hedging 27,597 47,222 71,010 — 145,829 —Others — — — 2,634 2,634 ￦ 27,618 91,153 143,396 58,949 321,116 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
Fair value and book value of financial assets and liabilities	2019 2020 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 ￦ 379,170 379,170 358,559 358,559 Derivative assets (trading) 165,204 165,204 110,764 110,764 Derivative assets (applying hedge accounting) 145,829 145,829 55,649 55,649 Financial assets at fair value through profit or loss 747,261 747,261 1,881,382 1,881,382 ￦ 1,437,464 1,437,464 2,406,354 2,406,354 Assets carried at amortized cost Financial assets at amortized cost ￦ 13,609 13,609 14,422 14,422 Loans and receivables 738,707 738,707 790,162 790,162 Long-term financial instruments 608,256 608,256 578,621 578,621 Short-term financial instruments 1,351,971 1,351,971 1,483,482 1,483,482 Trade and other receivables 9,703,749 9,703,749 9,780,039 9,780,039 Cash and cash equivalents 1,810,129 1,810,129 2,029,584 2,029,584 ￦ 14,226,421 14,226,421 14,676,310 14,676,310 Liabilities recognized at fair value Derivative liabilities (trading) ￦ 53,147 53,147 157,926 157,926 Derivative liabilities (applying hedge accounting) 116,813 116,813 207,193 207,193 ￦ 169,960 169,960 365,119 365,119 Liabilities carried at amortized cost Secured borrowings ￦ 227,135 227,135 63,614 63,614 Unsecured bond 63,171,664 66,917,421 64,607,401 68,839,316 Lease liabilities 5,070,133 5,070,133 4,621,096 4,621,096 Unsecured borrowings 4,104,523 4,113,955 4,808,206 5,513,242 Trade and other payables (*) 8,545,029 8,545,029 8,115,837 8,115,837 Bank overdraft 373,219 373,219 245,360 245,360 ￦ 81,491,703 85,246,892 82,461,514 87,398,465 (*) Excludes lease liabilities.
Interest rates used for determining fair value	The discount rate used for calculating fair value as of December 31, 2019 and 2020 are as follows: Type 2019 2020 Derivatives 0.01% ~ 4.16% (-) 0.73% ~ 3.08% Borrowings and debt securities 0.17% ~ 3.90% (-) 0.53% ~ 4.38% Finance lease 1.38% ~ 10.83% 0.57% ~ 16.60%
Fair value hierarchy	Fair values of financial instruments by hierarchy level as of December 31, 2019 and 2020 are as follows: 2019 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 ￦ 201,202 — 177,968 379,170 Derivative assets — 308,399 2,634 311,033 Financial assets at fair value through profit or loss — 742,105 5,156 747,261 ￦ 201,202 1,050,504 185,758 1,437,464 Financial liabilities at fair value Derivative liabilities ￦ — 169,960 — 169,960 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
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, 2019 and 2020 are as follows: 2019 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 ￦ 5,052 40 — 64 — — 5,156 Financial assets at fair value through other comprehensive income Unlisted securities 189,439 1,876 — 3,715 (19,315 ) 2,253 177,968 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

Service Concession Arrangemen_2

Service Concession Arrangements (Tables)	12 Months Ended
	Dec. 31, 2020
Service Concession Arrangements [Abstract]
Gas Complex Thermal Power Plant at Ilijan, Philippines	The Company’s expected future collections of service concession arrangements as of December 31, 2020 are as follows: Type Amounts In millions of won Less than 1 year ￦ 113,646 1~ 2 years 47,353 ￦ 160,999
Hydroelectric Power Generation at Semangka, Indonesia	The Company’s expected future collections of service concession arrangements as of December 31, 2020 are as follows: Type Amounts In millions of won Less than 1 year ￦ 27,113 1~ 2 years 27,144 2~ 3 years 27,175 Over 3 years 525,350 ￦ 606,782

Related parties (Tables)

Related parties (Tables)	12 Months Ended
	Dec. 31, 2020
Related Parties [Abstract]
Related Party Transactions	Related party transactions for the years ended December 31, 2018, 2019 and 2020 are as follows: <Sales and Others> Sales and others Company name Transaction type 2018 2019 2020 In millions of won <Associates> Dongducheon Dream Power Co., Ltd. Electricity sales ￦ 6,093 7,071 7,757 Korea Gas Corporation Electricity sales 99,933 116,484 97,685 Daejung Offshore Wind Power Co., Ltd. Electricity sales 1 1 32 Daegu Photovoltaic Co., Ltd. Electricity sales 128 327 325 Haeng Bok Do Si Photovoltaic Power Co., Ltd. Electricity sales 2 2 2 Korea Electric Power Industrial Development Co., Ltd. Service 10,422 11,085 10,833 Goseong Green Power Co., Ltd. Electricity sales 10,024 19,245 47,701 Gangneung Eco Power Co., Ltd. Service 4,928 7,446 10,178 Shin Pyeongtaek Power Co., Ltd. Electricity sales 8,468 21,218 20,791 Noeul Green Energy Co., Ltd. Electricity sales 30 30 30 Samcheok Eco Materials Co., Ltd. Electricity sales 605 627 700 YTN Co., Ltd. Electricity sales 2,043 2,257 1,805 Busan Green Energy Co., Ltd. Electricity sales 19 18 34 Gunsan Bio Energy Co., Ltd. Electricity sales 3,611 4,755 102 Korea Electric Vehicle Charging Service Electricity sales 578 1,029 1,956 Tamra Offshore Wind Power Co., Ltd. Electricity sales 58 — — Daegu clean Energy Co., Ltd. Electricity sales 126 — — Gangwon Wind Power Co., Ltd. Electricity sales 2,402 2,433 2,109 Gwangyang Green Energy Co., Ltd. Electricity sales 874 122 23 Bigeum Resident Photovoltaic Power Co., Ltd. Electricity sales — — 85 Hyundai Green Power Co., Ltd. Design service 14,031 13,106 17,257 Korea Power Exchange Service 6,854 7,670 25,919 Taebaek Wind Power Co., Ltd. Service 614 991 226 Taebaek Guinemi Wind Power Co., Ltd. Electricity sales — 77 37 Pyeongchang Wind Power Co., Ltd. Design service 1,166 1,189 2,064 Daeryun Power Co., Ltd. Electricity sales 1,731 1,879 1,947 Changjuk Wind Power Co., Ltd. Electricity sales 758 927 2,067 GS Donghae Power Co., Ltd. Electricity sales 7,238 15,792 31,557 KNH Solar Co., Ltd. Electricity sales 17 17 16 S-Power Service 9,118 6,535 6,682 PND solar Co., Ltd. Electricity sales 12 407 409 Hyundai Ecoenergy Co., Ltd. Electricity sales — 117 167 YeongGwang Yaksu Wind Electric Co., Ltd. Electricity sales — 81 77 Korea Energy Solution Co., Ltd. Electricity sales — 52 7 Green Energy Electricity Generation Co., Ltd. Electricity sales — — 14 Namjeongsusang Solar Power Operation Co., Ltd. Electricity sales — — 14 Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 Electricity sales — — 291 Muan Solar Park Co., Ltd. Electricity sales ￦ — — 57 Suwon New Power Co., Ltd. Electricity sales — 5,606 2,974 Muan Sunshine Solar Power Plant Co., Ltd. Electricity sales — — 30 9 Associates (Overseas) Electricity sales and others 60,318 98,450 66,755 <Joint ventures> Naepo Green Energy Co., Ltd. Electricity sales 160 154 217 Cheongna Energy Co., Ltd. Service 11,688 9,922 13,791 DAYONE Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.) Service 1,718 3,437 4,816 Daegu Green Power Co., Ltd. Electricity sales 1,022 1,151 1,285 KAPES, Inc. Commission 648 504 476 Honam Wind Power Co., Ltd. Electricity sales 415 657 502 Jeongam Wind Power Co., Ltd. Electricity sales 724 1,198 1,213 Korea Power Engineering Service Co., Ltd. Service 840 348 203 Seokmun Energy Co., Ltd. Service 1,897 1,495 1,932 Incheon New Power Co., Ltd. Construction revenue 568 354 14 Chun-cheon Energy Co., Ltd. Electricity sales 2,471 2,397 2,657 Yeonggwangbaeksu Wind Power Co., Ltd. Electricity sales 1,540 1,744 1,788 Yeonggwang Wind Power Co., Ltd. Electricity sales 46 705 793 Sam-Yang Electricity sales — — 33 NH-Amundi Service — — 1,388 KW Nuclear Components Co., Ltd. Service 839 721 1,639 KEPCO-Uhde Inc. Electricity sales 17 15 8 Busan Shinho Solar Power Co., Ltd. Electricity sales 362 452 353 Daesan Green Energy Co., Ltd. Electricity sales — 39 703 Taebaek Gadeoksan Wind Power Co., Ltd. Electricity sales — — 3 Cheong-Song Noraesan Wind Power Co., Ltd. Electricity sales — 6 29 Saemangeum Solar Power Co., Ltd. Service — 2,230 2,846 Jaeun Resident Wind Power Plant Co., Ltd. Electricity sales — 105 — Dangjin Eco Power co., Ltd. Electricity sales 3,424 4 33 Bitsolar Energy Co., Ltd. Electricity sales — — 42 Haemodum Solar Co., Ltd. Electricity sales — — 4 Yeongam Solar Power Co., Ltd. Electricity sales — — 165 Solaseado Solar Power Co., Ltd. Electricity sales — — 66 29 Joint ventures (Overseas) Electricity sales and others 206,054 1,275,279 831,596 <Others> Yeongwol Energy Station Co., Ltd. Service 373 — — DS POWER Co., Ltd. Service 565 — — Ulleungdo Natural Energy Co., Ltd. Service 292 — — Korea Development Bank Electricity sales 3,524 3,948 4,248 Interest income 4,438 2,091 3,461 <Purchase and Others> Purchase and others Company name Transaction type 2018 2019 2020 In millions of won <Associates> Dongducheon Dream Power Co., Ltd. Electricity purchase ￦ 828,547 689,510 552,692 Korea Gas Corporation Purchase of power generation 5,191,243 4,049,486 3,270,972 Daegu Photovoltaic Co., Ltd. REC purchase 3,745 3,626 3,313 Haeng Bok Do Si Photovoltaic Power Co., Ltd. REC purchase 455 450 370 Korea Electric Power Industrial Development Co., Ltd. Electricity metering service 261,668 245,057 212,366 Goseong Green Power Co., Ltd. Electricity purchase — 32 — Gangneung Eco Power Co., Ltd. Service 19 — — Shin Pyeongtaek Power Co., Ltd. Electricity purchase — 119,162 520,737 Noeul Green Energy Co., Ltd. REC purchase 18,282 22,767 10,634 Samcheok Eco Materials Co., Ltd. Electricity purchase 3,819 9,425 10,713 YTN Co., Ltd. Service 322 333 353 Busan Green Energy Co., Ltd. Electricity purchase 25,123 13,811 18,678 Gunsan Bio Energy Co., Ltd. Electricity purchase — 3,022 24 Korea Electric Vehicle Charging Service Service 605 536 581 Tamra Offshore Wind Power Co., Ltd. Electricity purchase 8,371 — — Yaksu ESS Co., Ltd. Service — 1,191 217 Gangwon Wind Power Co., Ltd. Electricity purchase 25,407 24,116 23,350 Hyundai Green Power Co., Ltd. Electricity purchase 480,815 507,662 349,778 Korea Power Exchange Trading fees 137,489 120,509 87,361 Taebaek Wind Power Co., Ltd. Electricity purchase 8,582 7,070 4,003 Taebaek Guinemi Wind Power Co., Ltd. Electricity purchase — 349 5,023 Pyeongchang Wind Power Co., Ltd. Electricity purchase 6,994 5,188 3,969 Daeryun Power Co., Ltd. Electricity purchase 184,063 144,862 99,523 Changjuk Wind Power Co., Ltd. Electricity purchase 7,929 6,994 6,084 GS Donghae Electric Power Co., Ltd. Electricity purchase 780,233 681,379 660,351 KNH Solar Co., Ltd. Electricity purchase 3,586 3,377 3,564 S-Power Electricity purchase 507,875 522,469 293,515 Hadong Mineral Fiber Co., Ltd. Service 60 — — Green Biomass Co., Ltd. Woodchip purchase 440 — — YeongGwang Yaksu Wind Electric Co., Ltd Electricity purchase 2,437 6,511 9,151 PND solar Co., Ltd. Electricity purchase — 557 5,234 Hyundai Ecoenergy Co., Ltd. Electricity purchase — 6,810 17,777 Korea Energy Solution Co., Ltd. Electricity purchase — 15 — Gwangbaek Solar Power Investment Co., Ltd. Electricity purchase — — 373 9 Associates (Overseas) Electricity purchase and 31 — — <Joint ventures> Cheongna Energy Co., Ltd. Electricity purchase ￦ 58 58,747 66 DAYONE Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.) Electricity purchase 3,445 2,847 1,120 Daegu Green Power Co., Ltd. Electricity purchase 287,008 296,464 215,224 KAPES, Inc. Service 77,758 142,511 219,673 Honam Wind Power Co., Ltd. Electricity purchase 7,700 5,306 4,382 Jeongam Wind Power Co., Ltd. Electricity purchase — — 5,982 Korea Power Engineering Service Co., Ltd. Service 1,765 1,774 1,594 Seokmun Energy Co., Ltd. Electricity purchase 31,759 26,370 33,164 Chun-cheon Energy Co., Ltd. Electricity purchase 320,954 313,471 222,069 Yeonggwangbaeksu Wind Power Co., Ltd. Electricity purchase 11,366 11,739 11,232 Yeonggwang Wind Power Co., Ltd. Electricity purchase — 11,940 24,103 Sam-Yang Electricity purchase — — 3,848 Busan Shinho Solar Power Co., Ltd. REC purchase 7,901 7,843 7,296 Global Trade Of Power System Co., Ltd. Service 565 502 337 Expressway Solar-light Power Generation Co., Ltd. REC purchase 3,513 3,067 2,472 Daesan Green Energy Co., Ltd. Electricity purchase — — 104,854 Dangjin Eco Power Co., Ltd. Electricity purchase — — 3,953 Busan Industrial Solar Power Co., Ltd. Electricity purchase — — 19 Haemodum Solar Co., Ltd. Electricity purchase — — 967 Yeongam Solar Power Co., Ltd. Electricity purchase — — 32,208 Solaseado Solar Power Co., Ltd. Electricity purchase — — 28,516 29 Joint ventures (Overseas) Electricity purchase and 1,404 7,232 14,767 <Others> Yeongwol Energy Station Co., Ltd. REC purchase 4,019 — — Ulleungdo Natural Energy Co., Ltd. Service 63 — — Korea Development Bank Interest expense 5,043 4,063 3,872 Dividend paid 166,876 20 17
Receivables and payables arising from related party transactions	Receivables and payables arising from related party transactions as of December 31, 2019 and 2020 are as follows: Receivables Payables Company name Type 2019 2020 2019 2020 In millions of won <Associates> Dongducheon Dream Power Co., Ltd. Trade receivables ￦ 323 388 — — Non-trade receivables and others 267 213 — — Trade payables — — 85,920 65,794 Non-trade — — 12 — Korea Gas Corporation Trade receivables ￦ 9,267 9,969 — — Non-trade 38 95 — — Trade payables — — 462,138 428,763 Non-trade — — 560 617 Daejung Offshore Wind Power Co., Ltd. Non-trade — 31 — — Daegu Photovoltaic Co., Ltd. Trade payables — — 69 57 Korea Electric Power Industrial Development Co., Ltd. Trade receivables 243 508 — — Non-trade 43 16 — — Trade payables — — 3,756 133 Non-trade — — 3,827 3,779 Goseong Green Power Co., Ltd. Trade receivables 103 2,181 — — Non-trade 5,285 9,214 — — Non-trade — — 65,626 64,986 Gangneung Eco Power Co., Ltd. Trade receivables 115 661 — — Non-trade 65 146 — — Shin Pyeongtaek Power Co., Ltd. Trade receivables 1,013 1,348 — — Non-trade 2,281 2,823 — — Trade payables — — 64,696 47,948 Non-trade — — 61 85 Noeul Green Energy Co., Ltd. Trade receivables 3 3 — — Non-trade — 969 — — Non-trade — — 1,855 — Samcheok Eco Materials Co., Ltd. Trade receivables 59 47 — — YTN Co., Ltd. Trade receivables 97 97 — — Busan Green Energy Co., Ltd. Trade receivables 1 5 — — Non-trade — 13,946 — — Non-trade — — 606 — Korea Electric Vehicle Charging Service Trade receivables 137 141 — — Non-trade 529 281 — — Yaksu ESS Co., Ltd. Trade payables — — 525 739 Gangwon Wind Power Co., Ltd. Trade receivables 7 6 — — Trade payables — — 2,979 2,678 Gwangyang Green Energy Co., Ltd. Non-trade 1,334 1,356 — — Hyundai Green Power Co., Ltd. Trade receivables ￦ 502 554 — — Trade payables — — 41,587 9,825 Korea Power Exchange Trade receivables 1,142 1,608 — — Non-trade 144 24 — — Trade payables — — — 1,362 Non-trade — — 4,160 70,456 Ecollite Co., Ltd. Non-trade 210 — — — Taebaek Wind Power Co., Ltd. Non-trade — 1,405 — — Trade payables — — 358 443 Non-trade — — 243 — Taebaek Guinemi Wind Power Co., Ltd. Non-trade 2 — — — Trade payables — — 190 413 Non-trade — — — 509 Pyeongchang Wind Power Co., Ltd. Trade receivables 4 3 — — Daeryun Power Co., Ltd. Trade receivables 144 189 — — Trade payables — — 19,843 16,079 Changjuk Wind Power Co., Ltd. Trade payables — — 447 461 Non-trade — — 280 309 GS Donghae Electric power Co., Ltd. Trade receivables 175 386 — — Non-trade 367 321 — — Trade payables — — 69,811 91,213 Non-trade — — 16 36 KNH Solar Co., Ltd. Trade receivables 1 1 — — Trade payables — — — 14 Non-trade — — — 187 S-Power Trade receivables 89 137 — — Non-trade 43 46 — — Trade payables — — 53,705 23,415 PND solar Co., Ltd. Trade payables — — — 58 Hyundai Ecoenergy Co., Ltd. Trade receivables 16 16 — — YeongGwang Yaksu Wind Electric Co., Ltd. Trade receivables 5 8 — — Muan Solar Park Co., Ltd. Trade receivables — 24 — — Go deok Clean Energy Co., Ltd. Non-trade — 1 — — Suwon New Power Co., Ltd. Trade receivables ￦ — 2 — — Non-trade 2,939 712 — — 6 Associates (Overseas) Non-trade 1,112 3,248 — — <Joint ventures> Naepo Green Energy Co., Ltd. Trade receivables 18 56 — — DAYONE Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.) Trade receivables 128 57 — — Non-trade 12,532 11,749 — — Trade payables — — 175 10 Non-trade — — 9,178 9,119 Daegu Green Power Co., Ltd. Trade receivables 113 44 — — Non-trade 1 55 — — Trade payables — — 28,980 26,213 KAPES, Inc. Trade receivables 1 2 — — Non-trade — 5,172 — — Non-trade — — 50,738 20,577 Honam Wind Power Co., Ltd. Trade payables — — 347 216 Non-trade — — 1,671 345 Jeongam Wind Power Co., Ltd. Trade receivables 165 — — — Non-trade — 162 — — Non-trade — — 6 692 Korea Power Engineering Service Co.,Ltd. Non-trade 74 43 — — Seokmun Energy Co., Ltd. Trade receivables 51 62 — — Non-trade 136 9,460 — — Trade payables — — — 4,898 Non-trade — — 4,750 9,559 Chun-cheon Energy Co., Ltd. Trade receivables 260 98 — — Non-trade 5,362 165 — — Trade payables — — 23,438 27,428 Yeonggwangbaeksu Wind Power Co., Ltd. Trade receivables 6 8 — — Non-trade 157 159 — — Trade payables — — 671 405 Non-trade — — 1,526 1,747 Cheongna Energy Co., Ltd. Trade receivables 1,074 1,592 — — Non-trade — 1,186 — — Yeonggwang Wind Power Co., Ltd. Trade receivables ￦ 10 12 — — Non-trade 54 54 — — Trade payables — — — 886 Non-trade — — 2,432 3,038 Sam-Yang Trade receivables — 5 — — Non-trade — — — 625 KW Nuclear Components Co., Ltd. Trade receivables 4 4 — — Non-trade 15 — — — KEPCO-Uhde Inc. Non-trade — — 9 — Busan Shinho Solar Power Co., Ltd. Trade receivables 2 2 — — Trade payables — — 148 135 Non-trade — — 733 780 Daesan Green Energy Co., Ltd. Trade receivables 6 11 — — Non-trade — 216 — — Trade payables — — — 7,694 Taebaek Gadeoksan Wind Power Co., Ltd. Non-trade — 5 — — Trade payables — — — 2,473 Non-trade — — — 5 Cheong-Song Noraesan Wind Power Co., Ltd. Trade receivables 1 2 — — Saemangeum Solar Power Co., Ltd. Non-trade 2,197 3,141 — — Dangjin Eco Power Co., Ltd. Trade receivables 2 3 — — Trade payables — — — 326 Busan Industrial Solar Power Co., Ltd. Trade payables — — — 1 Yeongam Solar Power Co., Ltd. Trade receivables — 26 — — Trade payables — — — 14,652 15 Joint ventures (Overseas) Trade receivables 51,700 58,839 — — Non-trade 13,652 17,217 — — Non-trade — — 87,395 105,682 <Others> Korea Development Bank Accrued interest income 1,630 51 — — Non-trade 146,416 206,916 — — Non-trade — — 152 123 Derivatives 41,368 20,167 6,531 20,001
Loans and others arising from related party transactions	Loans and others arising from related party transactions as of December 31, 2019 and 2020 are as follows: Type Company name Beginning Loans Collection Others Ending balance In millions of won Associates KNOC Nigerian East Oil Co., Ltd., KNOC Nigerian West Oil Co., Ltd. ￦ 28,676 92 — (1,619 ) 27,149 (Allowance for doubtful accounts) (7,325 ) — — 2,079 (5,246 ) Associates PT. Cirebon Electric Power 578 — (609 ) 31 — Associates Xe-Pian Xe-Namnoy 20,955 — — (1,263 ) 19,692 Associates PT. Wampu Electric Power 16,502 — (4,474 ) 330 12,358 Associates Gunsan Bio Energy Co., Ltd. 12,396 — — — 12,396 (Allowance for doubtful accounts) (10,128 ) — — — (10,128 ) Associates Bigeum Resident Photovoltaic Power Co., Ltd. — 3,500 — — 3,500 Associates Daejung Offshore Wind Power Co., Ltd. — 1,000 — — 1,000 Joint ventures DAYONE Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.) 2,465 — (2,465 ) — — (Allowance for doubtful accounts) (2,465 ) — 2,465 — — Joint ventures Solaseado Solar Power Co., Ltd. — 64,000 — — 64,000 Joint ventures Recursos Solares PV De Mexico II, S.A. De C.V. DE C.V. 1,055 4,458 — (669 ) 4,844 Joint ventures Horus Solar, S.A. De C.V. 3,323 11,404 — (1,347 ) 13,380 Joint ventures SUNMEX RENOVABLES, S.A. DE C.V. 144 1,755 — (57 ) 1,842 Joint ventures Kelar S.A. 42,158 — — (2,542 ) 39,616 Joint ventures Chun-cheon Energy Co., Ltd. 5,057 — (5,057 ) — — Joint ventures DE Energia SpA 6,632 — — (400 ) 6,232 Joint ventures Daehan Wind Power PSC — 11,852 — (1,152 ) 10,700 Joint ventures PT. Tanjung Power Indonesia — 777 — (72 ) 705 Joint ventures Bitsolar Energy Co., Ltd., — 3,165 — — 3,165 ￦ 120,023 102,003 (10,140 ) (6,681 ) 205,205
Borrowings arising from related party transactions	Borrowings arising from related party transactions as of December 31, 2019 and 2020 are as follows: Related parties Type Beginning balance Borrowings Repayment Others Ending balance In millions of won Korea Development Bank Facility ￦ 59,845 — (9,552 ) — 50,293 Others 3,500 — (554 ) — 2,946 Operating funds 179,000 152,961 (187,511 ) (150 ) 144,300 Syndicated Loan 17,085 — (1,063 ) (99 ) 15,923 EBL — 43,485 — (3,392 ) 40,093
Guarantees provided to associates or joint ventures	Guarantees provided to associates or joint ventures as of December 31, 2020 are as follows: Primary guarantor Principal obligor Type of guarantees Credit limit Guarantee In millions of Korea Electric Power Corporation Shuweihat Asia Performance guarantees USD 11,000 Shuweihat Asia Power Korea Electric Power Corporation Rabigh Performance guarantees USD 1,387 Rabigh Electricity Korea Electric Power Corporation Nghi Son 2 Power Performance guarantees USD 70,000 SMBC Ho Chi Minh Debt guarantees USD 285,000 SMBC Singapore Korea Electric Power Corporation Barakah One Debt guarantees USD 900,000 Export-Import Bank Performance guarantees USD 4,439,920 Korea Electric Power Corporation RE Holiday Performance USD 206,494 EPS Renewables Korea Electric Power Corporation RE Pioneer Performance guarantees USD 158,718 EPS Renewables Korea Electric Power Corporation RE Barren Ridge 1 Performance USD 135,783 Firstar Development, Korea Electric Power Corporation Rabigh Electricity Performance guarantees SAR 6,508 Hana Bank Performance guarantees SAR 68,054 Korea Electric Power Corporation Shuweihat Asia Performance guarantees USD 100,000 ING Bank Korea Electric Power Corporation Amman Asia Performance guarantees USD 16,800 Shinhan Bank Korea Electric Power Corporation Pulau Indah Power Performance guarantees MYR 7,500 Maybank Korea Western Power Co., Ltd. Cheongna Energy Collateralized money KRW 4,940 Kookmin Bank and Guarantees for — Korea Western Power Co., Ltd. Xe-Pian Xe-Namnoy Payment guarantees for USD 2,500 Krung Thai Bank Collateralized money KRW 64,570 Impounding bonus USD 5,000 SK E&C Korea Western Power Co., Ltd. Rabigh Performance guarantees SAR 11,200 National Bank of Korea Western Power Co., Ltd. Daegu Photovoltaic Collateralized money KRW 2,066 Korea Development Korea Western Power Co., Ltd. Dongducheon Collateralized money KRW 45,041 Kookmin Bank and Debt guarantees KRW 20,300 BNK Securities Korea Western Power Co., Ltd. PT. Mutiara Jawa Collateralized money KRW 1,780 Woori Bank Korea Western Power Co., Ltd. Haeng Bok Do Si Collateralized money KRW 210 Nonghyup Bank Korea Western Power Co., Ltd. Shin Pyeongtaek Collateralized money KRW 69,591 Kookmin Bank Guarantees for — Kookmin Bank and Korea Western Power Co., Ltd. Haemodum Solar Collateralized money KRW 3,065 Nonghyup Bank Korea Western Power Co., Ltd. Sam-Yang Collateralized money KRW 5,535 Korea Development Guarantees for — Korea Western Power Co., Ltd. Muan Solar Park Collateralized money KRW 4,180 IBK and others Korea Western Power Co., Ltd. Anjwa Smart Collateralized money KRW 5,510 Hana Bank and others Guarantees for — Korea East-West Power Co., Ltd. Busan Shinho Solar Collateralized money KRW 5,378 Korea Development Korea East-West Power Co., Ltd. Seokmun Energy Collateralized money KRW 14,814 Kookmin Bank and Guarantees for — Korea East-West Power Co., Ltd. Chun-cheon Energy Collateralized money KRW 27,518 Kookmin Bank and Guarantees for KRW 90,800 Korea East-West Power Co., Ltd. Honam Wind Collateralized money KRW 3,887 Shinhan Bank and Guarantees for — Korea East-West Power Co., Ltd. GS Donghae Collateralized money KRW 244,426 Korea Development Guarantees for — Korea East-West Power Co., Ltd. Yeonggwangbaeksu Collateralized money KRW 3,124 Kookmin Bank and Korea East-West Power Co., Ltd. Yeonggwang Wind Collateralized money KRW 17,256 KDB Capital Guarantees for — Korea East-West Power Co., Ltd. Daesan Green Collateralized money KRW 22,552 IBK Guarantees for KRW 18,989 Korea East-West Power Co., Ltd. Taebaek Gadeoksan Collateralized money KRW 13,362 Samsung Fire & Korea East-West Power Co., Ltd. PT. Tanjung Power Debt guarantees USD 24,544 Sumitomo mitsui Other guarantees USD 3,150 PT Adaro Indonesia Guarantees for — Sumitomo mitsui Collateralized money KRW 33,063 MUFG and others Korea East-West Power Co., Ltd. South Jamaica Performance guarantees USD 14,400 Societe Generale Collateralized money KRW 31,897 JCSD Trustee EWP Barbados 1 SRL South Jamaica Guarantees for — JCSD Trustee Korea East-West Power Co., Ltd. DE Energia SpA Collateralized money KRW 8,187 Mirae Asset Daewoo Debt guarantees USD 5,728 Payment USD 1,066 Hana Bank Korea East-West Power Co., Ltd. Bitsolar Energy Collateralized money KRW 352 Mirae Asset Life Korea Southern Power Co., Ltd. KNH Solar Co., Collateralized money KRW 2,436 Shinhan Bank and Performance guarantees — Korea Southern Power Co., Ltd. Daeryun Power Collateralized money KRW 26,353 Korea Development Guarantees for KRW 8,000 Korea Southern Power Co., Ltd. Daegu Green Power Collateralized money KRW 23,045 Shinhan Bank and Performance guarantees — Korea Southern Power Co., Ltd. Kelar S.A. Performance guarantees USD 57,987 Hana Bank, MUFG Korea Southern Power Co., Ltd. Daehan Wind Performance guarantees USD 3,600 Shinhan Bank Payment USD 1,898 Hana Bank Korea Southern Power Co., Ltd. Pyeongchang Wind Collateralized money KRW 5,027 Woori Bank and Performance guarantees — Korea Southern Power Co., Ltd. Taebaek Guinemi Collateralized money KRW 3,087 IBK Korea Southern Power Co., Ltd. Jeongam Wind Performance guarantees — SK Securities.Co., Collateralized money KRW 4,620 Korea Southern Power Co., Ltd. Samcheok Eco Payment — SEM Investment Co., Korea Southern Power Co., Ltd. Solaseado Solar Collateralized money KRW 7,379 Kookmin Bank and Korea Southern Power Co., Ltd. Naepo Green Collateralized money — IBK and others Guarantees for KRW 30,000 Guarantees for other — KOSPO Chile SpA Kelar S.A. Collateralized money KRW 71,449 Export-Import Bank KOSPO Chile SpA Chester Solar I SpA Collateralized money KRW 1,621 IBK KOSPO Chile SpA Chester Solar IV Collateralized money KRW 1,064 KOSPO Chile SpA Chester Solar V Collateralized money KRW 277 KOSPO Chile SpA Diego de Almagro Collateralized money KRW 1,490 KOSPO Chile SpA Laurel SpA Collateralized money KRW 1,092 Korea Midland Power Co., Ltd. YeongGwang Collateralized money KRW 312 IBK and others Korea Midland Power Co., Ltd. Hyundai Green Collateralized money KRW 132,774 Korea Development Korea Midland Power Co., Ltd. PT. Cirebon Debt guarantees USD 10,038 Mizuho Bank Korea Midland Power Co., Ltd. PT. Wampu Debt guarantees USD 5,271 SMBC Korea Midland Power Co., Ltd. Green Energy Collateralized money KRW 25 IBK Guarantees for — IBK and others Korea Midland Power Co., Ltd. Yaksu ESS Co., Collateralized money KRW 454 IBK Korea Midland Power Co., Ltd. Namjeongsusang Collateralized money KRW 103 IBK Korea Midland Power Co., Ltd. Gwangbaek Solar Collateralized money KRW 4,682 Kyobo Life Insurance Korea Midland Power Co., Ltd. Muan Sunshine Collateralized money KRW 1,096 IBK Korea Midland Power Co., Ltd. Goesan Solar Park Collateralized money KRW 1,684 IBK Korea Midland Power Co., Ltd. Bitgoel Eco Energy Collateralized money KRW 29 IBK and others Guarantees for — Korea South-East Power Co., Ltd. DAYONE Energy Collateralized money — IBK Guarantees for KRW 76,800 NH investment & Korea South-East Power Co., Ltd. S-Power Collateralized money KRW 110,292 Korea Development Korea South-East Power Co., Ltd. RES Technology Collateralized money KRW 15,930 UniCredit Bulbank Korea South-East Power Co., Ltd. ASM-BG Collateralized money KRW 18,200 UniCredit Bulbank Korea South-East Power Co., Ltd. Expressway Solar- Guarantees for KRW 2,500 Woori Bank Korea South-East Power Co., Ltd. Goseong Green Collateralized money KRW 2,186 Kyobo Life Insurance Korea South-East Power Co., Ltd. Gangneung Eco Collateralized money KRW 2,368 Kyobo Life Insurance Korea South-East Power Co., Ltd. PND solar Co., Ltd. Collateralized money KRW 1,149 IBK Korea South-East Power Co., Ltd. Hyundai Eco Collateralized money KRW 4,250 Samsung Life Korea South-East Power Co., Ltd. Jaeun Resident Collateralized money KRW 2,195 IBK Korea South-East Power Co., Ltd. Cheongsong Collateralized money KRW 4,124 Kyobo Life Insurance Korea South-East Power Co., Ltd. Youngam Solar Collateralized money KRW 6,042 Kookmin Bank and Korea South-East Power Co., Ltd. Samsu Wind Power Collateralized money KRW 2,607 Shinhan Bank and Korea South-East Power Co., Ltd. Saemangeum Collateralized money KRW 11,022 Woori Bank and Korea Hydro & Nuclear Power Co., Ltd. Noeul Green Collateralized money KRW 4,197 Hana Bank and others Korea Hydro & Nuclear Power Co., Ltd. Busan Green Collateralized money KRW 8,778 Shinhan Bank and Korea Hydro & Nuclear Power Co., Ltd. Cheong-Song Collateralized money KRW 3,453 Woori Bank and KEPCO Plant Service & Engineering Co., Ltd. Incheon New Collateralized money — Shinhan Bank Guarantees for — (*1) The Company guarantees to provide supplemental funding for business with respect to excessive business expenses or insufficient repayment of borrowings. (*2) The Company has granted the right to Hana Financial Investment Co., Ltd., as an agent for the creditors to Expressway Solar-light Power Generation Co., Ltd. (“ESPG”), to the effect that in the event of acceleration of ESPG’s payment obligations under certain borrowings to such creditors, Hana Financial may demand the Company to dispose of shares in ESPG held by the Company and apply the resulting proceeds to repayment of ESPG’s obligations. (*3) This includes a guarantee for the shareholder’s capital payment in connection with the business of 190MW gas complex thermal power plant in Jamaica. EWP Barbados 1 SRL’s capital contribution amount is USD 18,400 thousand and there is no residual guarantee amount among total collateral limit. (*4) Controlling and non-controlling pre-emption (*5) The Company recognized an impairment loss on all of the equity securities of DAYONE Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.) before the prior year, and the acquisition cost of the securities provided as collateral is ￦47,067 million. (*6) 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. (*7) The common stocks of Dongducheon Dream Power Co., Ltd. held by the Company were pledged as collateral. (*8) 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. (*9) The Company provided a payment guarantee to Daehan Wind Power PSC for opening LC for Debt Service Reserve Account (DSRA). (*10) This includes a guarantee related to LC for debt repayment allowance provided to DE Energia SpA, a joint venture of the Company. (*11) 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. (*12) 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.
Derivatives transactions with related parties	Derivatives transactions with related parties as of December 31, 2020 are as follows: (i) Currency Swap Counterparty Contract Contract Amount 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 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 2020~2026 118,910 USD 100,000 0.61 % 1.00 % 1,189.10 2016~2021 121,000 USD 100,000 2.15 % 2.50 % 1,210.00 2019~2022 112,650 USD 100,000 1.80 % 3.38 % 1,126.50 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 2018~2021 212,960 USD 200,000 2.10 % 3.00 % 1,064.80 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 Banko 2017.12.27 2021.07.12 ￦ 104,849 USD 100,000 ￦ 1,048.49 2020.12.18 2021.01.28 5,469 USD 5,000 1,093.75 2020.12.30 2021.02.19 5,436 USD 5,000 1,087.16 2020.12.15 2021.01.05 1,092 USD 1,000 1,092.10 2020.12.29 2021.01.05 6,791 USD 6,200 1,095.35
Salaries and other compensations to the key members of management of the Company	The Company recorded salaries and other compensations related to the key management personnel as follows: Type 2018 2019 2020 In millions of won Salaries ￦ 1,106 1,315 1,295 Retirement benefits 24 31 58 ￦ 1,130 1,346 1,353

Non-Cash Transactions (Tables)

Non-Cash Transactions (Tables)	12 Months Ended
	Dec. 31, 2020
Non-Cash Transactions [Abstract]
Significant non-cash activities	Significant non-cash Transactions 2018 2019 2020 In millions of won Transfer from construction-in-progress ￦ 8,656,252 14,052,094 10,189,527 Recognition of asset retirement cost and related provision for decommissioning costs 310,272 2,425,668 895,507 Transfer from provision for disposal of spent nuclear fuel to accrued expenses 482,699 376,103 395,921 Transfer from long-term borrowings and debt securities to current portion of long-term borrowings and debt securities 7,100,846 7,759,284 9,237,883 Transfer from inventory to stored nuclear fuel — 1,129,374 1,055,974 Transfer of right-of-use — 5,364,647 291,334
Changes in liabilities incurred from financing activities	Changes in liabilities incurred from financing activities for the years ended December 31, 2019, and 2020 are as follows: 2019 Non-cash Beginning Cash flows Increase Changes in Effect of Increase Ending balance In millions of won Borrowings and debt securities ￦ 61,034,626 6,342,074 — — 496,940 2,900 67,876,540 Lease liabilities 283,806 (573,437 ) 218,800 4,943,584 197,380 — 5,070,133 ￦ 61,318,432 5,768,637 218,800 4,943,584 694,080 2,900 72,946,673 2020 Non-cash Beginning Cash flows Increase Effect of 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

Commitments for Expenditure (Ta

Commitments for Expenditure (Tables)	12 Months Ended
	Dec. 31, 2020
Commitments for Expenditure [Abstract]
Commitments for acquisition of property, plant and equipment	The commitments for acquisition of property, plant and equipment as of December 31, 2019 and 2020 are as follows: 2019 2020 Contracts Commitment Remaining Commitment Remaining In millions of won Purchase of cable (PVC, 1C, 2000SQ) 153,000M and others (Shin-Bupyung-Youngseo) ￦ 56,408 24,721 56,574 16,038 Purchase of cable (PVC, 1C, 2500SQ) 103,374M and others (Bukdangjin-Shin-Tangjung) 45,390 32,876 45,390 32,876 Purchase of GIS (362kV, 6300A, 63kA) 23CB – Youngseo S/S 36,143 36,143 36,143 29,898 Purchase of GIS (362kV, 6300A, 63kA) 26CB – Hwasung S/S 40,010 15,300 40,010 8,328 Purchase of GIS (362kV, 6300A, 63kA) 27CB – Kwangyang S/S 37,744 9,700 37,744 2,244 Purchase of cable (FR CNCO-W, 59,716 37,249 59,716 37,249 Purchase of switch (Eco) 9,360 units 40,631 24,031 40,631 24,031 Purchase of cable (TR CNCE-W/AL, 36,063 6,243 35,708 — Purchase of cable (TR CNCE-W,1C,600SQ) — — 37,288 23,100 Purchase of cable (TR CNCE-W/AL,1C,400SQ) — — 82,622 51,130 Purchase of cable (FR CNCO-W,1C,325SQ) — — 42,068 35,358 Concrete pole (10M, general purpose, 350KGF) 102,435 ea and five other equipments ￦ — — 91,889 80,904 Construction of Shin-Kori units (#5,6) 8,625,387 4,479,956 8,625,387 3,256,117 Construction of Shin-Hanul units (#1,2) 8,306,149 — 9,443,635 160,512 Other 20 contracts 352,710 122,890 107,586 58,466 Service of designing Seoul Combined units (#1,2) 30,778 2,119 31,841 984 Purchase of main machine for construction of Seoul Combined units (#1,2) 331,249 15,918 331,249 — Construction of Seoul Combined units (#1,2) 387,722 31,150 409,597 — Service of designing Shin-Boryeong units (#1,2) 120,668 888 121,163 521 Purchase of main machine for construction of Shin-Boryeong units (#1,2) 816,317 4,955 816,317 — Purchase of furnace for construction of Shin-Seocheon thermal power plant 305,209 43,388 305,209 29,042 Purchase of turbine generator for construction of Shin-Seocheon thermal power plant 105,226 10,736 105,226 8,279 Electricity construction of Shin-Seocheon thermal power plant 231,196 87,874 282,234 13,524 Purchase of main machine for Jeju LNG combined 166,287 12,088 166,287 11,182 Service of designing Taean units (#9,10) 112,483 12,862 112,813 12,933 Purchase of gas turbine and turbine equipment of Gimpo combined heat & power plant 104,600 104,600 104,600 41,840 Purchase of steam turbine, HRSG and POWER BLOCK of Gimpo combined heat & power plant — — 210,900 147,630 Purchase of coal handling machine for construction of Samcheok units (#1,2) 282,927 42,785 285,158 22,751 Purchase of furnace main equipment for construction of Samcheok units (#1,2) 1,066,824 11,771 1,065,141 11,609 Purchase of turbine main equipment for Samcheok units (#1,2) 223,550 132 211,349 125 Purchase of main equipment for Namjeju 138,486 84,982 140,144 112
Commitments for inventory purchase	As of December 31, 2020, 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 quantity 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 1,572 Ton U (contract period : 2009~2024).

Contingencies and Commitments (

Contingencies and Commitments (Tables)	12 Months Ended
	Dec. 31, 2020
Contingencies and Commitments [Abstract]
Ongoing litigations related with contingent liabilities and contingent assets	Ongoing litigations and claims related with contingent liabilities and contingent assets as of December 31, 2019 and 2020 are as follows: 2019 2020 Number Claim Number Claim In millions of won As the defendant 586 ￦ 697,835 663 ￦ 550,535 As the plaintiff 199 707,287 200 729,798
Credit lines provided by financial institutions	Commitments Financial institutions Currency Credit limit Used amount In millions of won and thousands of Commitments on Bank-overdraft Nonghyup Bank and others KRW 1,936,500 229,960 Commitments on Bank-daylight overdraft Nonghyup Bank KRW 280,000 — Limit amount available for CP Hana Bank KRW 1,150,000 1,150,000 Limit amount available for card Hana Bank and others KRW 47,104 5,378 Banco de Oro PHP 5,000 3,000 Loan limit Kookmin Bank and others KRW 1,752,333 957,924 DBS Bank and others USD 1,809,700 55,393 Certification of payment on payables from foreign country Nonghyup Bank USD 8,700 7,912 Certification of payment on L/C Shinhan Bank and others USD 938,400 90,240 Mizuho Bank MXN 3,666 3,666 Certification of Performance guarantee on contract Seoul Guarantee Insurance and others KRW 66,890 59,677 First Abu Dhabi Bank and others USD 1,036,334 834,223 Korea Development Bank and others JPY 637,670 637,670 Hana Bank EUR 4,065 4,065 Shinhan Bank INR 6,806 6,806 Hana Bank CAD 148 148 Maybank MYR 7,500 7,500 Hana Bank SAR 68,054 68,054 Certification of bidding Hana Bank USD 10,000 197 Hana Bank EUR 2 2 Advance payment bond, Warranty bond, Retention bond and others Seoul Guarantee Insurance KRW 40,153 40,153 Export-Import Bank of Korea and others USD 550,616 498,761 Hana Bank SAR 6,508 6,508 Hana Bank MXN 20,538 20,538 Others Nonghyup Bank and others KRW 654,162 32,009 Export-Import Bank of Korea and others USD 2,268,158 1,819,226 Shinhan Bank JPY 381,210 381,210 Standard Chartered AED 50 50 Shinhan Bank MXN 6,471 4,901 Inclusive credit Hana Bank KRW 8,000 927 Hana Bank and others USD 30,722 17,236 Shinhan Bank INR 70,028 70,028 Trade finance BNP Paribas and others USD 750,000 —
Blank check and assets provided as collaterals or pledges to financial institutions by the Company	As of December 31, 2019, blank check and assets provided as collaterals or pledges to financial institutions by the Company are follows: Guarantor Guarantee Type of guarantee 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) SE Green Energy Co., Ltd. DB Insurance Co., Ltd. and others Property, plant and equipment and others KRW 149,500 Collateral for borrowings(*2) Gyeonggi Green Energy Co., Ltd. Korea Development Bank and others Cash and cash equivalents KRW 327,800 Collateral for borrowings(*2) Commerce and Industry Energy Co., Ltd. IBK and others Land, buildings, structures and machinery and others KRW 110,500 Collateral for borrowings(*2) KOSPO Youngnam Power Co., Ltd. Shinhan Bank and others Cash and cash equivalents KRW 396,120 Collateral for borrowings(*2) Gyeongju Wind Power Co., Ltd. Samsung Fire & Marine Insurance Co., Ltd. and Others Property, plant and equipment and others KRW 110,240 Collateral for borrowings(*2) Korea Offshore Wind Power Co., Ltd. Woori Bank and Others Utility plant 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) (*1) This is based on the amount of loan commitment limit. (*2) As of December 31, 2020, the Company has established guarantees for pledge for transfer of rights of long-term borrowings, pledge for insurance claims, pledge for shares, etc.

Business Combination (Tables)

Business Combination (Tables)	12 Months Ended
	Dec. 31, 2020
Disclosure of detailed information about business combination [Abstract]
Disclosure of business combinations	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
Details of the transfer price at fair value given by the acquirer of the business combination	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.
The fair values of assets and liabilities acquired through the business combination at the acquisition date	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 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 Deferred tax liabilities (41,729 ) ￦ 130,363
Details of goodwill resulting from the business combination	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
Net cash outflows from the business combination	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, 2020
Subsequent Events [Abstract]
Subsequent Events	Subsequent to December 31, 2020, Korea Hydro & Nuclear Power Co., Ltd., Korea South-East Power Co., Ltd., Korea Midland Power Co., Ltd., Korea Western Power Co., Ltd. and Korea Southern Power Co., Ltd. issued corporate bonds and global bond for operation, repayment of debts and investing in green new deal projects as follows: Company Type Issue date Maturity Interest rate Amount In millions of won and thousands of USD Korea Hydro & Nuclear Power Unsecured (Global bond) 2021.04.27 2026.04.27 1.25 % USD 500,000 Korea South-East Power Co., Ltd. Corporate bond 2021.01.26 2031.01.26 1.90 % KRW 180,000 Corporate bond 2021.01.26 2041.01.26 1.97 % KRW 90,000 Corporate bond 2021.01.26 2051.01.26 1.96 % KRW 30,000 Corporate bond 2021.04.08 2026.04.08 1.82 % KRW 140,000 Corporate bond 2021.04.08 2028.04.08 1.99 % KRW 50,000 Korea Midland Power Co., Ltd. Corporate bond 2021.04.02 2024.04.02 1.45 % KRW 90,000 Corporate bond 2021.04.21 2026.04.21 1.85 % KRW 190,000 Korea Western Power Co., Ltd. Corporate bond 2021.04.29 2024.04.29 1.39 % KRW 60,000 Corporate bond 2021.04.29 2026.04.29 1.87 % KRW 150,000 Corporate bond 2021.04.29 2031.04.29 2.18 % KRW 20,000 Korea Southern Power Co., Unsecured (Global bond 21) 2021.01.27 2026.01.27 0.75 % USD 450,000 Corporate bond 2021.04.14 2022.04.14 0.86 % KRW 150,000 Corporate bond 2021.04.14 2023.04.14 1.14 % KRW 70,000

General Information (Details)

General Information (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Reporting Entity (Description of the controlling company) [Abstract]
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 January 1, 1982 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 listed on the Korea Stock Exchange on August 10, 1989 and KEPCO listed its Depository Receipts (DR) on the New York Stock Exchange on October 27, 1994.
Address of registered office of entity	KEPCO's head office is located in Naju, Jeollanam-do.
Issued capital	₩ 3,209,820	₩ 3,209,820

Shareholders Information (Detai

Shareholders Information (Details) - shares	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of shareholders information [Line Items]
Number of shares	641,964,077	641,964,077	641,964,077
Percentage of ownership	100.00%
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
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	106,414,565
Percentage of ownership	16.58%
Other Shareholders
Disclosure of shareholders information [Line Items]
Number of shares	207,472,454
Percentage of ownership	32.32%

Significant Basis Of Preparatio

Significant Basis Of Preparation And Accounting Policies_Estimated economic useful lives for premises and equipment except for land (Details)	12 Months Ended
	Dec. 31, 2020
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 Basis Of Preparat_2

Significant Basis Of Preparation And Accounting Policies_Estimated useful life for intangible assets (Details)	12 Months Ended
	Dec. 31, 2020
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)	-
Amortization methods	Unit of production

Operating segments (Details)

Operating segments (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of operating segments [Line Items]
Total segment revenue	₩ 57,925,837	₩ 58,568,082	₩ 60,033,062
Intersegment revenue	0	0	0
Revenue from external customers	57,925,837	58,568,082	60,033,062
Depreciation and amortisation	11,548,019	11,128,740	10,024,794
Interest income	242,586	268,118	223,767
Interest expense	1,995,425	2,046,811	1,868,458
Employee benefit expense	492,288	725,120	360,575
Loss on abandonment of property, plant and equipment	255,346	364,233	481,176
Increase in provisions, net	1,832,765	2,301,215	1,056,994
Operating profit (loss)	4,096,620	(1,707,527)	(685,109)
Finance income	1,510,249	1,009,706	796,870
Finance expense	(2,896,443)	(2,782,156)	(2,470,743)
Profit (loss) related to associates and joint ventures	281,107	214,139	358,163
Profit (loss) before income tax	2,991,533	(3,265,838)	(2,000,819)
Segment assets	203,142,111	197,597,792	185,249,061
Investments in associates and joint ventures	6,170,533	5,914,831	5,878,345
Acquisition of non-current assets	13,401,665	14,229,785	12,377,457
Segment liabilities	132,475,265	128,708,143	114,156,299
Operating segments
Disclosure of operating segments [Line Items]
Total segment revenue	91,899,958	95,197,218	97,262,180
Intersegment revenue	33,974,121	36,629,136	37,229,118
Revenue from external customers	57,925,837	58,568,082	60,033,062
Depreciation and amortisation	11,675,647	11,250,366	10,081,743
Interest income	273,438	301,857	268,043
Interest expense	2,027,897	2,081,559	1,912,094
Employee benefit expense	541,893	737,207	391,055
Loss on abandonment of property, plant and equipment	255,347	364,233	481,176
Increase in provisions, net	2,002,416	2,553,019	1,049,005
Operating profit (loss)	4,387,807	(1,411,975)	(557,368)
Profit (loss) related to associates and joint ventures	281,107	214,138	358,163
Segment assets	241,913,304	235,492,772	223,823,428
Investments in associates and joint ventures	6,170,533	5,914,831	5,878,345
Acquisition of non-current assets	13,432,396	14,311,340	12,440,174
Segment liabilities	133,818,362	130,033,377	115,812,546
Operating segments | Transmission and distribution
Disclosure of operating segments [Line Items]
Total segment revenue	57,345,933	58,328,372	59,676,952
Intersegment revenue	1,224,602	1,336,725	1,393,120
Revenue from external customers	56,121,331	56,991,647	58,283,832
Depreciation and amortisation	3,836,355	3,814,428	3,555,158
Interest income	48,220	73,478	77,925
Interest expense	737,973	777,120	708,329
Employee benefit expense	190,302	298,144	144,180
Loss on abandonment of property, plant and equipment	236,727	350,865	424,774
Increase in provisions, net	731,194	987,828	580,931
Operating profit (loss)	3,045,912	(2,568,529)	(1,814,363)
Profit (loss) related to associates and joint ventures	169,176	140,757	287,268
Segment assets	113,115,667	109,809,254	107,486,379
Investments in associates and joint ventures	4,204,090	3,716,931	3,671,897
Acquisition of non-current assets	6,535,380	6,340,593	6,323,504
Segment liabilities	59,772,046	58,350,681	53,404,610
Operating segments | Electric power generation (Nuclear)
Disclosure of operating segments [Line Items]
Total segment revenue	9,938,941	8,937,026	8,858,717
Intersegment revenue	9,817,147	8,908,803	8,833,787
Revenue from external customers	121,794	28,223	24,930
Depreciation and amortisation	3,564,120	3,227,695	3,088,019
Interest income	25,581	37,277	30,422
Interest expense	503,485	511,864	503,161
Employee benefit expense	86,672	132,283	76,467
Loss on abandonment of property, plant and equipment	0	0	38,886
Increase in provisions, net	691,052	672,134	520,167
Operating profit (loss)	1,168,833	782,511	357,401
Profit (loss) related to associates and joint ventures	(4,905)	(5,497)	9,946
Segment assets	61,850,865	59,562,190	55,792,704
Investments in associates and joint ventures	116,867	59,081	43,038
Acquisition of non-current assets	2,419,939	2,574,358	2,187,077
Segment liabilities	35,652,467	33,909,152	30,484,104
Operating segments | Electric power generation (Non-nuclear)
Disclosure of operating segments [Line Items]
Total segment revenue	20,329,611	24,254,957	25,204,085
Intersegment revenue	19,552,376	23,472,153	24,389,816
Revenue from external customers	777,235	782,804	814,269
Depreciation and amortisation	4,034,024	3,955,333	3,269,023
Interest income	20,843	35,626	29,313
Interest expense	622,346	655,466	577,441
Employee benefit expense	112,775	163,626	91,140
Loss on abandonment of property, plant and equipment	17,679	13,364	17,516
Increase in provisions, net	346,195	766,407	(227,234)
Operating profit (loss)	(172,884)	551,287	482,418
Profit (loss) related to associates and joint ventures	115,096	77,641	58,993
Segment assets	54,531,155	54,758,933	49,296,392
Investments in associates and joint ventures	1,807,409	2,088,581	2,114,203
Acquisition of non-current assets	3,758,795	4,955,784	3,435,222
Segment liabilities	33,292,680	33,117,193	27,558,156
Operating segments | Plant maintenance & engineering service
Disclosure of operating segments [Line Items]
Total segment revenue	2,703,472	2,627,539	2,526,126
Intersegment revenue	2,283,333	2,254,841	2,170,959
Revenue from external customers	420,139	372,698	355,167
Depreciation and amortisation	119,056	125,546	114,030
Interest income	11,789	14,214	12,505
Interest expense	1,250	2,861	4,126
Employee benefit expense	101,255	124,745	77,526
Loss on abandonment of property, plant and equipment	0	0	0
Increase in provisions, net	230,264	124,242	174,785
Operating profit (loss)	197,553	312,341	314,755
Profit (loss) related to associates and joint ventures	1,740	1,237	1,956
Segment assets	3,492,571	3,528,879	3,431,068
Investments in associates and joint ventures	42,167	50,238	49,207
Acquisition of non-current assets	141,226	95,810	111,393
Segment liabilities	1,061,949	1,124,855	1,200,390
Operating segments | Others
Disclosure of operating segments [Line Items]
Total segment revenue	1,582,001	1,049,324	996,300
Intersegment revenue	1,096,663	656,614	441,436
Revenue from external customers	485,338	392,710	554,864
Depreciation and amortisation	122,092	127,364	55,513
Interest income	167,005	141,262	117,878
Interest expense	162,843	134,248	119,037
Employee benefit expense	50,889	18,409	1,742
Loss on abandonment of property, plant and equipment	940	4	0
Increase in provisions, net	3,711	2,408	356
Operating profit (loss)	148,393	(489,585)	102,421
Profit (loss) related to associates and joint ventures	0	0	0
Segment assets	8,923,046	7,833,516	7,816,885
Investments in associates and joint ventures	0	0	0
Acquisition of non-current assets	577,056	344,795	382,978
Segment liabilities	4,039,220	3,531,496	3,165,286
Material reconciling items
Disclosure of operating segments [Line Items]
Total segment revenue	(33,974,121)	(36,629,136)	(37,229,118)
Intersegment revenue	(33,974,121)	(36,629,136)	(37,229,118)
Revenue from external customers	0	0	0
Depreciation and amortisation	(127,628)	(121,626)	(56,949)
Interest income	(30,852)	(33,739)	(44,276)
Interest expense	(32,472)	(34,748)	(43,636)
Employee benefit expense	(49,605)	(12,087)	(30,480)
Loss on abandonment of property, plant and equipment	0	0	0
Increase in provisions, net	(169,651)	(251,804)	7,989
Operating profit (loss)	(291,187)	(295,552)	(127,741)
Profit (loss) related to associates and joint ventures	0	0	0
Segment assets	(38,771,193)	(37,894,980)	(38,574,367)
Investments in associates and joint ventures	0	0	0
Acquisition of non-current assets	(30,731)	(81,555)	(62,717)
Segment liabilities	(1,343,097)	(1,325,234)	₩ (1,656,247)
Elimination of intersegment amounts
Disclosure of operating segments [Line Items]
Segment assets	(39,762,888)	(39,207,636)
Investments in associates and joint ventures	0	0
Acquisition of non-current assets	(30,731)	(81,555)
Segment liabilities	(6,749,728)	(6,654,717)
Equity method adjustment
Disclosure of operating segments [Line Items]
Segment assets	1,372,001	1,791,844
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	47,664	2,048
Investments in associates and joint ventures	0	0
Acquisition of non-current assets	0	0
Segment liabilities	5,417,629	5,329,158
Others
Disclosure of operating segments [Line Items]
Profit (loss) before income tax		(481,236)
Segment assets	(427,970)	0
Investments in associates and joint ventures	0	0
Acquisition of non-current assets	0	₩ 325
Segment liabilities	₩ (10,998)

Geographical areas (Details)

Geographical areas (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue
Electricity		₩ 55,730,985	₩ 55,939,001	₩ 56,842,011
Heat supply		198,715	220,948	216,117
Others		754,612	734,927	839,676
Sales of goods		56,684,312	56,894,876	57,897,804
Sales of services		429,350	408,290	392,867
Sales of construction services		812,175	1,264,916	1,742,391
Total revenue from external customers		57,925,837	58,568,082	60,033,062
Non-current assets	[1]	176,505,403	172,110,120	160,336,774
Domestic
Revenue
Electricity		55,730,985	55,939,001	56,842,011
Heat supply		198,715	220,948	216,117
Others		450,908	449,381	456,738
Sales of goods		56,380,608	56,609,330	57,514,866
Sales of services		223,075	222,106	176,539
Sales of construction services		170,895	110,692	108,586
Total revenue from external customers		56,774,578	56,942,128	57,799,991
Non-current assets	[1]	173,673,478	169,366,365	157,037,428
Overseas
Revenue
Electricity		0	0	0
Heat supply		0	0	0
Others		303,704	285,546	382,938
Sales of goods		303,704	285,546	382,938
Sales of services		206,275	186,184	216,328
Sales of construction services		641,280	1,154,224	1,633,805
Total revenue from external customers	[2]	1,151,259	1,625,954	2,233,071
Non-current assets	[1],[2]	₩ 2,831,925	₩ 2,743,755	₩ 3,299,346
[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, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of Classification by categories of financial assets [Line Items]
Cash and cash equivalents	₩ 2,029,584	₩ 1,810,129	₩ 1,358,345	₩ 2,369,739
Categories of current financial assets
Current financial assets at fair value through profit or loss	1,196,101	131,385
Current financial assets at amortized costs	13,149	12,302
Current Derivative assets	29,525	27,618
Other financial assets	1,561,445	1,415,204
Trade and other receivables	7,918,470	7,701,452
Total current financial assets And Cash and cash equivalents	12,748,274	11,098,090
Non-Financial Assets
Non-current financial assets at fair value through profit or loss	685,281	615,876
Non-current financial assets at fair value through other comprehensive income	358,559	379,170
Non-current financial assets at amortized costs	1,273	1,307
Non-current Derivative assets	136,888	283,415
Other financial assets	1,290,820	1,283,730
Trade and other receivables	1,861,569	2,002,297
Total non-current financial assets	4,334,390	4,565,795
Total financial assets	17,082,664	15,663,885
Financial assets at fair value through profit or loss
Disclosure of Classification by categories 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	1,196,101	131,385
Current financial assets at amortized costs	0	0
Current Derivative assets	18,332	21
Other financial assets	0	0
Trade and other receivables	0	0
Total current financial assets And Cash and cash equivalents	1,214,433	131,406
Non-Financial Assets
Non-current financial assets at fair value through profit or loss	685,281	615,876
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	92,432	165,183
Other financial assets	0	0
Trade and other receivables	0	0
Total non-current financial assets	777,713	781,059
Total financial assets	1,992,146	912,465
Financial assets at fair value through other comprehensive income
Disclosure of Classification by categories 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
Non-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	358,559	379,170
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	358,559	379,170
Total financial assets	358,559	379,170
Financial assets at amortized cost
Disclosure of Classification by categories of financial assets [Line Items]
Cash and cash equivalents	2,029,584	1,810,129
Categories of current financial assets
Current financial assets at fair value through profit or loss	0	0
Current financial assets at amortized costs	13,149	12,302
Current Derivative assets	0	0
Other financial assets	1,561,445	1,415,204
Trade and other receivables	7,918,470	7,701,452
Total current financial assets And Cash and cash equivalents	11,522,648	10,939,087
Non-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	1,273	1,307
Non-current Derivative assets	0	0
Other financial assets	1,290,820	1,283,730
Trade and other receivables	1,861,569	2,002,297
Total non-current financial assets	3,153,662	3,287,334
Total financial assets	14,676,310	14,226,421
Derivative assets (applying hedge accounting)
Disclosure of Classification by categories 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	11,193	27,597
Other financial assets	0	0
Trade and other receivables	0	0
Total current financial assets And Cash and cash equivalents	11,193	27,597
Non-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	44,456	118,232
Other financial assets	0	0
Trade and other receivables	0	0
Total non-current financial assets	44,456	118,232
Total financial assets	₩ 55,649	₩ 145,829

Classification of Financial I_4

Classification of Financial Instruments - Classification of financial liabilities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Categories of current financial liabilities
Borrowings	₩ 2,113,181	₩ 1,315,134
Debt securities	8,561,624	7,542,705
Derivative liabilities	49,884	73,064
Trade and other payables	6,256,521	6,649,402
Total current financial liabilities	16,981,210	15,580,305
Categories of non-current financial liabilities
Borrowings	3,003,999	3,389,743
Debt securities	56,045,777	55,628,959
Derivative liabilities	315,235	96,896
Trade and other payables	6,480,412	6,965,760
Total non-current financial liabilities	65,845,423	66,081,358
Total financial liabilities	82,826,633	81,661,663
Financial liabilities at fair value through profit or loss
Categories of current financial liabilities
Borrowings	0	0
Debt securities	0	0
Derivative liabilities	13,053	13,286
Trade and other payables	0	0
Total current financial liabilities	13,053	13,286
Categories of non-current financial liabilities
Borrowings	0	0
Debt securities	0	0
Derivative liabilities	144,873	39,861
Trade and other payables	0	0
Total non-current financial liabilities	144,873	39,861
Total financial liabilities	157,926	53,147
Financial liabilities recognized at amortized cost
Categories of current financial liabilities
Borrowings	2,113,181	1,315,134
Debt securities	8,561,624	7,542,705
Derivative liabilities	0	0
Trade and other payables	6,256,521	6,649,402
Total current financial liabilities	16,931,326	15,507,241
Categories of non-current financial liabilities
Borrowings	3,003,999	3,389,743
Debt securities	56,045,777	55,628,959
Derivative liabilities	0	0
Trade and other payables	6,480,412	6,965,760
Total non-current financial liabilities	65,530,188	65,984,462
Total financial liabilities	82,461,514	81,491,703
Derivative liabilities (using hedge accounting)
Categories of current financial liabilities
Borrowings	0	0
Debt securities	0	0
Derivative liabilities	36,831	59,778
Trade and other payables	0	0
Total current financial liabilities	36,831	59,778
Categories of non-current financial liabilities
Borrowings	0	0
Debt securities	0	0
Derivative liabilities	170,362	57,035
Trade and other payables	0	0
Total non-current financial liabilities	170,362	57,035
Total financial liabilities	₩ 207,193	₩ 116,813

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Income, expense, gains or losses of financial instruments
Interest income	₩ 242,586	₩ 268,118	₩ 223,767
Dividends income	7,316	13,838	12,777
Gain (loss) on valuation of derivatives	(455,715)	317,350	153,203
Gain (loss) on valuation of financial assets	40,699	32,233
Interest expense of trade and other payables	88,757	94,019	42,830
Interest expense of others	540,867	558,464	505,112
Gain (loss) on repayment of financial liabilities	1,314	916	10,303
Cash and Cash Equivalents
Income, expense, gains or losses of financial instruments
Interest income	9,419	42,861	40,704
Financial assets at fair value through profit or loss
Income, expense, gains or losses of financial instruments
Interest income	19,114	29,411	21,713
Gain (loss) on valuation of derivatives	(52,447)	151,604	34,117
Gain (loss) on transaction of derivatives	36,563	63,329	39,114
Gain (loss) on valuation of financial assets	5,508	1,062	1,879
Gain on disposal of financial assets	11,344	1,760	1,837
Financial assets at fair value through other comprehensive income
Income, expense, gains or losses of financial instruments
Dividends income	7,316	13,838	12,777
Financial assets at amortized cost
Income, expense, gains or losses of financial instruments
Interest income	612	539	89
Loans and receivables
Income, expense, gains or losses of financial instruments
Interest income	26,232	63,448	21,925
Trade and other receivables
Income, expense, gains or losses of financial instruments
Interest income	151,035	69,941	90,390
Short-term financial instruments
Income, expense, gains or losses of financial instruments
Interest income	25,540	49,070	41,025
Long-term financial instruments
Income, expense, gains or losses of financial instruments
Interest income	10,406	12,794	7,920
Other financial assets
Income, expense, gains or losses of financial instruments
Interest income	228	54	1
Derivative assets (applying hedge accounting)
Income, expense, gains or losses of financial instruments
Gain (loss) on valuation of derivatives	(77,733)	123,730	69,799
Gain (loss) on transaction of derivatives	36,053	65,651	34,152
Gain (loss) on valuation of derivatives (equity, before tax)	9,925	38,305	8,600
Financial liabilities at fair value through profit or loss
Income, expense, gains or losses of financial instruments
Gain (loss) on valuation of derivatives	(104,607)	27,686	(4,650)
Gain (loss) on transaction of derivatives	(49,788)	(493)	36,046
Financial liabilities carried at amortized cost
Income, expense, gains or losses of financial instruments
Interest expense of borrowings and debt securities	1,365,801	1,394,328	1,320,516
Interest expense of trade and other payables	88,757	94,019	42,830
Interest expense of others	540,867	558,464	505,112
Gain (loss) on repayment of financial liabilities	(35)
Gain (loss) on foreign currency transactions and translations	739,244	(406,175)	(356,159)
Derivative liabilities (using hedge accounting)
Income, expense, gains or losses of financial instruments
Gain (loss) on valuation of derivatives	(220,928)	14,330	53,937
Gain (loss) on transaction of derivatives	42,565	(42,072)	37,985
Gain (loss) on valuation of derivatives (equity, before tax)	₩ 101,295	₩ (2,578)	₩ (15,029)

Restricted Deposits (Details)

Restricted Deposits (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2020	Dec. 31, 2019
Restricted Deposits [Line Items]
Total Restricted Deposits		₩ 1,295,758	₩ 1,173,068
Cash and Cash Equivalents
Restricted Deposits [Line Items]
Escrow accounts		544	0
Deposits for government project		5,066	9,287
Collateral provided for borrowings		117,747	63,198
Collateral provided for lawsuit		42	3
Deposits for transmission regional support program		5,469	3,002
Total Restricted Deposits		128,868	75,490
Short-term financial instruments
Restricted Deposits [Line Items]
Restriction on withdrawal related to 'win-win growth program' for small and medium enterprises		109,000	93,000
Total Restricted Deposits		109,000	93,000
Current financial assets at fair value through profit or loss
Restricted Deposits [Line Items]
Decommissioning costs of nuclear power plants		0	0
Total Restricted Deposits		0	0
Non-Current financial assets at fair value through profit or loss
Restricted Deposits [Line Items]
Decommissioning costs of nuclear power plants		577,481	541,969
Total Restricted Deposits		577,481	541,969
Long-term financial instruments
Restricted Deposits [Line Items]
Escrow accounts		76	74
Collateral provided for borrowings		11,745	11,745
Decommissioning costs of nuclear power plants		258,282	250,464
Guarantee deposits for banking accounts at oversea branches		306	326
Funds for developing small and medium enterprises	[1]	210,000	200,000
Total Restricted Deposits		₩ 480,409	₩ 462,609
[1]	Deposits for small and medium enterprise at the Industrial Bank of Korea (IBK) and others for construction of Bitgaram Energy Valley and support for high potential businesses as of December 31, 2019 and 2020.

Cash and Cash Equivalents (Deta

Cash and Cash Equivalents (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash and Cash Equivalents [Abstract]
Total cash	₩ 871	₩ 266	₩ 138
Demand Deposit Accounts	1,291,058	1,117,499	927,650
Short-term deposits, classified as cash equivalents	432,263	527,235	211,424
Short-term investments, classified as cash equivalents	305,392	165,129	219,133
Total cash and cash equivalents	₩ 2,029,584	₩ 1,810,129	₩ 1,358,345	₩ 2,369,739

Trade and Other Receivables - T

Trade and Other Receivables - Trade and other receivables (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020		Dec. 31, 2019
Trade and Other Receivables [Line Items]
Gross amount	₩ 10,126,268		₩ 10,038,021
Allowance for doubtful accounts	(341,369)		(326,914)
Present value discount	(4,860)		(7,358)
Trade and other receivables	9,780,039		9,703,749
Current assets
Trade and Other Receivables [Line Items]
Gross amount	8,170,521		7,939,830
Allowance for doubtful accounts	(250,516)		(236,084)
Present value discount	(1,535)		(2,294)
Trade and other receivables	7,918,470		7,701,452
Current assets | Trade receivables
Trade and Other Receivables [Line Items]
Gross amount	7,370,923		7,147,683
Allowance for doubtful accounts	(208,184)		(208,505)
Present value discount	0		0
Trade and other receivables	7,162,739		6,939,178
Current assets | Other receivables
Trade and Other Receivables [Line Items]
Gross amount	799,598		792,147
Allowance for doubtful accounts	(42,332)		(27,579)
Present value discount	(1,535)		(2,294)
Trade and other receivables	755,731		762,274
Current assets | Non-trade receivables
Trade and Other Receivables [Line Items]
Gross amount	441,031		376,438
Allowance for doubtful accounts	(37,062)		(27,201)
Present value discount	0		0
Trade and other receivables	403,969		349,237
Current assets | Accrued income
Trade and Other Receivables [Line Items]
Gross amount	38,956		68,921
Allowance for doubtful accounts	0		0
Present value discount	0		0
Trade and other receivables	38,956		68,921
Current assets | Deposits
Trade and Other Receivables [Line Items]
Gross amount	239,011		273,887
Allowance for doubtful accounts	0		0
Present value discount	(1,535)		(2,294)
Trade and other receivables	237,476		271,593
Current assets | Finance lease receivables
Trade and Other Receivables [Line Items]
Gross amount	57,084	[1]	60,304	[2]
Allowance for doubtful accounts	(365)		(378)
Present value discount	0		0
Trade and other receivables	56,719		59,926
Current assets | Others
Trade and Other Receivables [Line Items]
Gross amount	23,516		12,597
Allowance for doubtful accounts	(4,905)		0
Present value discount	0		0
Trade and other receivables	18,611		12,597
Non-current assets
Trade and Other Receivables [Line Items]
Gross amount	1,955,747		2,098,191
Allowance for doubtful accounts	(90,853)		(90,830)
Present value discount	(3,325)		(5,064)
Trade and other receivables	1,861,569		2,002,297
Non-current assets | Trade receivables
Trade and Other Receivables [Line Items]
Gross amount	227,261		338,261
Allowance for doubtful accounts	(806)		(4,254)
Present value discount	0		(382)
Trade and other receivables	226,455		333,625
Non-current assets | Other receivables
Trade and Other Receivables [Line Items]
Gross amount	1,728,486		1,759,930
Allowance for doubtful accounts	(90,047)		(86,576)
Present value discount	(3,325)		(4,682)
Trade and other receivables	1,635,114		1,668,672
Non-current assets | Non-trade receivables
Trade and Other Receivables [Line Items]
Gross amount	215,136		196,821
Allowance for doubtful accounts	(80,451)		(78,654)
Present value discount	0		0
Trade and other receivables	134,685		118,167
Non-current assets | Accrued income
Trade and Other Receivables [Line Items]
Gross amount	834		2,222
Allowance for doubtful accounts	0		0
Present value discount	0		0
Trade and other receivables	834		2,222
Non-current assets | Deposits
Trade and Other Receivables [Line Items]
Gross amount	364,855		338,989
Allowance for doubtful accounts	0		0
Present value discount	(3,325)		(4,682)
Trade and other receivables	361,530		334,307
Non-current assets | Finance lease receivables
Trade and Other Receivables [Line Items]
Gross amount	1,065,982	[3]	1,118,537	[4]
Allowance for doubtful accounts	(625)		(484)
Present value discount	0		0
Trade and other receivables	1,065,357		1,118,053
Non-current assets | Others
Trade and Other Receivables [Line Items]
Gross amount	81,679		103,361
Allowance for doubtful accounts	(8,971)		(7,438)
Present value discount	0		0
Trade and other receivables	₩ 72,708		₩ 95,923
[1]	Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of KRW 105,127 million.
[2]	Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of KRW 112,789 million.
[3]	Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of KRW 1,087,559 million.
[4]	Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of KRW 1,218,934 million.

Trade and Other Receivables - O

Trade and Other Receivables - Other receivables (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Gross amount
Trade and Other Receivables [Line Items]
Trade receivables Face value	₩ 7,598,184	₩ 7,485,944
Trade receivables Allowance for doubtful accounts	(208,990)	(212,759)
Trade receivables Present value discount	0	(382)
Trade receivables	7,389,194	7,272,803
Other receivables Face value	2,528,084	2,552,077
Other receivables Allowance for doubtful accounts	(132,379)	(114,155)
Other receivables Present value discount	(4,860)	(6,976)
Other receivables	2,390,845	2,430,946
Current
Trade and Other Receivables [Line Items]
Trade receivables Face value	7,274,773	7,338,757
Other receivables Face value	2,363,967	2,327,640
Less than 60 days
Trade and Other Receivables [Line Items]
Trade receivables Face value	0	0
Other receivables Face value	0	0
Trade and Other receivables: (impairment reviewed)
Trade and Other Receivables [Line Items]
Trade receivables Face value	323,411	147,187
Other receivables Face value	164,117	224,437
Less than 60 days
Trade and Other Receivables [Line Items]
Trade receivables Face value	3,505	6,555
Other receivables Face value	46,399	98,220
60 ~ 90 days
Trade and Other Receivables [Line Items]
Trade receivables Face value	28,729	1,899
Other receivables Face value	31,183	2,034
90 ~ 120 days
Trade and Other Receivables [Line Items]
Trade receivables Face value	10,687	2,106
Other receivables Face value	1,873	14,135
120 days ~ 1year
Trade and Other Receivables [Line Items]
Trade receivables Face value	34,036	37,357
Other receivables Face value	11,803	26,212
Over 1 year
Trade and Other Receivables [Line Items]
Trade receivables Face value	246,454	99,270
Other receivables Face value	₩ 72,859	₩ 83,836

Trade and Other Receivables - C

Trade and Other Receivables - Changes in the allowance for doubtful accounts (Details) - KRW (₩) ₩ in Millions	Jan. 01, 2020	Jan. 01, 2019	Jan. 01, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Trade receivables
Reconciliation of changes in allowance account for credit losses of financial assets [Line Items]
Beginning balance	₩ 212,759	₩ 215,868	₩ 173,583	₩ 212,759	₩ 215,868	₩ 173,583
Effect of change in accounting policy	0	0	6,641
Loss allowance as at January 1 under IFRS 9	212,759	215,868	180,224
Changes in allowance account for credit losses of financial assets
Bad debt expense				24,021	29,221	41,498
Write-off				(20,332)	(10,106)	(7,696)
Reversal				(3,373)	(41,940)	(1,726)
Others				(4,085)	19,716	3,568
Ending balance				208,990	212,759	215,868
Other receivables
Reconciliation of changes in allowance account for credit losses of financial assets [Line Items]
Beginning balance	114,155	104,726	78,008	114,155	104,726	78,008
Effect of change in accounting policy	0	0	128
Loss allowance as at January 1 under IFRS 9	₩ 114,155	₩ 104,726	₩ 78,136
Changes in allowance account for credit losses of financial assets
Bad debt expense				27,329	19,206	17,817
Write-off				(1,910)	(1,146)	(244)
Reversal				(2,464)	0	(143)
Others				(4,731)	(8,631)	9,160
Ending balance				₩ 132,379	₩ 114,155	₩ 104,726

Financial Assets at Fair Valu_5

Financial Assets at Fair Value through Profit or Loss (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2020	Dec. 31, 2019
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Current financial assets at fair value through profit or loss		₩ 1,196,101	₩ 131,385
Non-current financial assets at fair value through profit or loss		685,281	615,876
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		1,196,101	131,385
Non-current financial assets at fair value through profit or loss		473,215	410,964
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		1,313	894
Non-current financial assets at fair value through profit or loss		155,122	160,952
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		5,692	5,155
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]	1,194,788	130,491
Non-current financial assets at fair value through profit or loss	[1]	312,401	244,857
Financial assets designated as 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		0	0
Non-current financial assets at fair value through profit or loss		212,066	204,912
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		212,066	150,916
Financial assets designated as 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		0	0
Non-current financial assets at fair value through profit or loss		₩ 0	₩ 53,996
[1]	'Other' includes MMT, etc.

Gains (losses) on financial ass

Gains (losses) on financial assets at fair value through profit or loss (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Financial Assets At Fair Value Through Profit Or Loss [Line Items]
Gains (losses) on financial assets at fair value through profit or loss	₩ 40,699	₩ 32,233
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	6,127	12,458
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	645	76
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	3,598	2,697
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	₩ 30,329	₩ 17,002

Changes in financial assets at

Changes in financial assets at fair value through other comprehensive income (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Changes in financial assets at fair value through other comprehensive income [Line Items]
Beginning balance	₩ 379,170	₩ 399,494
Acquisition	2,900	1,876
Disposal	(5)	(19,315)
Valuation	(30,937)	(8,019)
Others	7,431	5,134
Ending Balance	358,559	379,170
Listed equity securities
Changes in financial assets at fair value through other comprehensive income [Line Items]
Beginning balance	201,202	210,055
Acquisition	0	0
Disposal	(4)	0
Valuation	(7,809)	(11,734)
Others	1,281	2,880
Ending Balance	194,669	201,202
Unlisted equity securities
Changes in financial assets at fair value through other comprehensive income [Line Items]
Beginning balance	177,968	189,439
Acquisition	2,900	1,876
Disposal	(1)	(19,315)
Valuation	(23,128)	3,715
Others	6,150	2,254
Ending Balance	163,890	177,968
Current Financial assets at fair value through profit or loss, 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 profit or loss, category
Changes in financial assets at fair value through other comprehensive income [Line Items]
Beginning balance	379,170	399,494
Acquisition	2,900	1,876
Disposal	(5)	(19,315)
Valuation	(30,937)	(8,019)
Others	7,431	5,134
Ending Balance	₩ 358,559	₩ 379,170

Financial Assets at Fair Valu_6

Financial Assets at Fair Value through Other Comprehensive Income (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Financial assets at fair value through other comprehensive income [Line Items]
Acquisition Cost	₩ 634,823		₩ 626,056
Book value	358,559		379,170		₩ 399,494
Fair value	358,559		379,170
Listed equity securities
Financial assets at fair value through other comprehensive income [Line Items]
Acquisition Cost	359,327		359,339
Book value	194,669		201,202		210,055
Fair value	₩ 194,669		₩ 201,202
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	91,356		107,090
Fair value	₩ 91,356		₩ 107,090
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	107		80
Fair value	₩ 107		₩ 80
SM Korea Line Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	180		18
Ownership	0.00%		0.00%
Acquisition Cost	₩ 1		₩ 1
Book value	1		0
Fair value	₩ 1		₩ 0
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	49		52
Fair value	₩ 49		₩ 52
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	7		7
Fair value	₩ 7		₩ 7
Dongbu Corporation
Financial assets at fair value through other comprehensive income [Line Items]
Shares	955		955
Ownership	0.02%		0.00%
Acquisition Cost	₩ 12		₩ 12
Book value	13		8
Fair value	₩ 13		₩ 8
KSP Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	22,539		22,539
Ownership	0.08%		0.06%
Acquisition Cost	₩ 53		₩ 24
Book value	34		40
Fair value	₩ 34		₩ 40
STX Heavy Industries Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	7,419		8,639
Ownership	0.12%		0.03%
Acquisition Cost	₩ 107		₩ 213
Book value	29		26
Fair value	₩ 29		₩ 26
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	53,127		62,026
Fair value	₩ 53,127		₩ 62,026
Energy Fuels Inc.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,711,814		1,711,814
Ownership	1.31%		1.91%
Acquisition Cost	₩ 16,819		₩ 16,819
Book value	7,888		3,764
Fair value	₩ 7,888		₩ 3,764
Bunji Corporation Limited (formerly, Baralaba Coal Company Limited)
Financial assets at fair value through other comprehensive income [Line Items]
Shares	99,763		99,763
Ownership	0.07%		0.07%
Acquisition Cost	₩ 18,445		₩ 18,445
Book value	0		0
Fair value	₩ 0		₩ 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%		10.42%
Acquisition Cost	₩ 84,134		₩ 84,134
Book value	41,776		27,903
Fair value	₩ 41,776		₩ 27,903
Fission 3.0
Financial assets at fair value through other comprehensive income [Line Items]
Shares	75,000		75,000
Ownership	0.05%		0.14%
Acquisition Cost	₩ 0		₩ 0
Book value	6		5
Fair value	₩ 6		₩ 5
Fission Uranium Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	800,000		800,000
Ownership	0.16%		0.16%
Acquisition Cost	₩ 785		₩ 785
Book value	266		199
Fair value	₩ 266		199
SangSangin Industry Co., Ltd.(formerly, DMC Co., Ltd.)
Financial assets at fair value through other comprehensive income [Line Items]
Shares	5,831
Ownership	0.02%
Acquisition Cost	₩ 38
Book value	4
Fair value	₩ 4
Vitzosys Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	399
Ownership	0.00%
Acquisition Cost	₩ 2
Book value	2
Fair value	₩ 2
EMnI Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,257
Ownership	0.00%
Acquisition Cost	₩ 25
Book value	2
Fair value	2
Unlisted equity securities
Financial assets at fair value through other comprehensive income [Line Items]
Acquisition Cost	275,496		266,717
Book value	163,890		177,968		₩ 189,439
Fair value	₩ 163,890	[1]	₩ 177,968	[2]
Intellectual Discovery, Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,000,000		1,000,000
Ownership	6.00%		6.00%
Acquisition Cost	₩ 5,000		₩ 5,000
Book value	954		954
Fair value	₩ 954		₩ 954
Hwan Young Steel Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	10,916		10,916
Ownership	0.14%		0.14%
Acquisition Cost	₩ 1,092		₩ 1,092
Book value	97		97
Fair value	₩ 97		₩ 97
SAMBO AUTO. Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	15,066		15,066
Ownership	0.02%		0.02%
Acquisition Cost	₩ 38		₩ 38
Book value	38		38
Fair value	₩ 38		₩ 38
Mobo Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	504		504
Ownership	0.00%		0.00%
Acquisition Cost	₩ 14		₩ 14
Book value	14		14
Fair value	₩ 14		₩ 14
Dae Kwang Semiconductor Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	589		589
Ownership	0.07%		0.07%
Acquisition Cost	₩ 6		₩ 6
Book value	6		6
Fair value	₩ 6		₩ 6
Sanbon Department Store
Financial assets at fair value through other comprehensive income [Line Items]
Shares	828		828
Ownership	0.01%		0.01%
Acquisition Cost	₩ 124		₩ 124
Book value	3		3
Fair value	₩ 3		₩ 3
Miju Steel Mfg. Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,097		1,097
Ownership	0.23%		0.23%
Acquisition Cost	₩ 50		₩ 50
Book value	50		50
Fair value	₩ 50		₩ 50
Sungwon Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	117		117
Ownership	0.07%		0.07%
Acquisition Cost	₩ 15		₩ 15
Book value	15		15
Fair value	₩ 15		₩ 15
Hana Civil Engineering Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares			23
Ownership			0.00%
Acquisition Cost			₩ 1
Book value			1
Fair value			₩ 1
KC Development Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	839		839
Ownership	0.02%		0.02%
Acquisition Cost	₩ 6		₩ 6
Book value	6		6
Fair value	₩ 6		₩ 6
IMHWA Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	329		329
Ownership	0.11%		0.11%
Acquisition Cost	₩ 5		₩ 5
Book value	5		5
Fair value	₩ 5		₩ 5
DALIM Special Vehicle Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	58		58
Ownership	0.08%		0.08%
Acquisition Cost	₩ 10		₩ 10
Book value	10		10
Fair value	₩ 10		₩ 10
ASA JEONJU Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	34,846		34,846
Ownership	1.34%		1.34%
Acquisition Cost	₩ 697		₩ 697
Book value	69		69
Fair value	₩ 69		₩ 69
Moonkyung Silica Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	42		42
Ownership	0.56%		0.56%
Acquisition Cost	₩ 0		₩ 0
Book value	0		0
Fair value	₩ 0		₩ 0
Sungkwang Timber Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	3		3
Ownership	0.08%		0.08%
Acquisition Cost	₩ 5		₩ 5
Book value	5		5
Fair value	₩ 5		₩ 5
Yongbo Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares			61
Ownership			0.20%
Acquisition Cost			₩ 3
Book value			3
Fair value			₩ 3
HJ Steel Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	218		218
Ownership	0.07%		0.07%
Acquisition Cost	₩ 2		₩ 2
Book value	2		2
Fair value	₩ 2		₩ 2
KS Remicon Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	12		12
Ownership	0.04%		0.04%
Acquisition Cost	₩ 3		₩ 3
Book value	3		3
Fair value	₩ 3		₩ 3
Joongang Platec Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	3,591		3,591
Ownership	0.75%		0.75%
Acquisition Cost	₩ 72		₩ 72
Book value	35		35
Fair value	₩ 35		₩ 35
Pyungsan SI Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	434		434
Ownership	0.01%		0.01%
Acquisition Cost	₩ 9		₩ 9
Book value	9		9
Fair value	₩ 9		₩ 9
Samgong Development Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	12		12
Ownership	0.01%		0.01%
Acquisition Cost	₩ 7		₩ 7
Book value	7		7
Fair value	₩ 7		₩ 7
Joongang Development Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	540		540
Ownership	0.12%		0.12%
Acquisition Cost	₩ 8		₩ 8
Book value	8		8
Fair value	₩ 8		₩ 8
AJS Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	12,906		12,906
Ownership	0.23%		0.23%
Acquisition Cost	₩ 32		₩ 32
Book value	32		32
Fair value	₩ 32		₩ 32
MSE Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	429		429
Ownership	0.13%		0.13%
Acquisition Cost	₩ 9		₩ 9
Book value	9		9
Fair value	₩ 9		₩ 9
Ilrim Nano Tec Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,520		1,520
Ownership	0.07%		0.07%
Acquisition Cost	₩ 15		₩ 15
Book value	15		15
Fair value	₩ 15		₩ 15
Youngjin Hi-Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	2,512		2,512
Ownership	0.25%		0.25%
Acquisition Cost	₩ 126		₩ 126
Book value	21		21
Fair value	₩ 21		₩ 21
Buyoung Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	270		270
Ownership	0.00%		0.00%
Acquisition Cost	₩ 3		₩ 3
Book value	3		3
Fair value	₩ 3		₩ 3
Ilsuk Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	152		152
Ownership	0.17%		0.17%
Acquisition Cost	₩ 10		₩ 10
Book value	10		10
Fair value	₩ 10		₩ 10
Dongyang Telecom Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,760		1,760
Ownership	0.01%		0.01%
Acquisition Cost	₩ 11		₩ 11
Book value	1		11
Fair value	₩ 1		₩ 11
Jongwon Remicon Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	31		31
Ownership	0.18%		0.18%
Acquisition Cost	₩ 13		₩ 13
Book value	13		13
Fair value	₩ 13		₩ 13
Zyle Daewoo Motor Sales Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	22		22
Ownership	0.00%		0.00%
Acquisition Cost	₩ 0		₩ 0
Book value	0		0
Fair value	₩ 0		₩ 0
Daewoo Development Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	8		8
Ownership	0.00%		0.00%
Acquisition Cost	₩ 0		₩ 0
Book value	0		0
Fair value	₩ 0		₩ 0
Seyang Inc.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	537		537
Ownership	0.05%		0.05%
Acquisition Cost	₩ 27		₩ 27
Book value	27		27
Fair value	₩ 27		₩ 27
Seungri Enterprise Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	93		93
Ownership	0.05%		0.05%
Acquisition Cost	₩ 3		₩ 3
Book value	3		3
Fair value	₩ 3		₩ 3
Onggane Food Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares			5
Ownership			0.07%
Acquisition Cost			₩ 1
Book value			1
Fair value			₩ 1
Shin-E P&C Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,569		1,569
Ownership	0.64%		0.64%
Acquisition Cost	₩ 111		₩ 111
Book value	3		3
Fair value	₩ 3		₩ 3
Ejung Ad Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	132		132
Ownership	0.09%		0.09%
Acquisition Cost	₩ 3		₩ 3
Book value	3		3
Fair value	₩ 3		₩ 3
Solvus Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,056		1,056
Ownership	0.04%		0.04%
Acquisition Cost	₩ 3		₩ 3
Book value	3		3
Fair value	₩ 3		₩ 3
Myung Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	89		89
Ownership	0.05%		0.05%
Acquisition Cost	₩ 2		₩ 2
Book value	2		2
Fair value	₩ 2		₩ 2
Shinil Engineering Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	887		887
Ownership	0.06%		0.06%
Acquisition Cost	₩ 3		₩ 3
Book value	3		3
Fair value	₩ 3		₩ 3
Biwang Industry Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	406		406
Ownership	0.04%		0.04%
Acquisition Cost	₩ 2		₩ 2
Book value	2		2
Fair value	₩ 2		₩ 2
Young Sung Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	89		89
Ownership	0.40%		0.40%
Acquisition Cost	₩ 26		₩ 27
Book value	26		27
Fair value	₩ 26		₩ 27
Yuil Industrial Electronics Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	804		804
Ownership	0.32%		0.32%
Acquisition Cost	₩ 15		₩ 16
Book value	15		16
Fair value	₩ 15		₩ 16
DN TEK Inc.
Financial assets at fair value through other comprehensive income [Line Items]
Shares			12,401
Ownership			0.29%
Acquisition Cost			₩ 62
Book value			6
Fair value			₩ 6
Woojin Industry Corporation
Financial assets at fair value through other comprehensive income [Line Items]
Shares	3		3
Ownership	0.00%		0.00%
Acquisition Cost	₩ 16		₩ 16
Book value	16		16
Fair value	₩ 16		₩ 16
Kwang Sung Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	325		325
Ownership	0.35%		0.35%
Acquisition Cost	₩ 7		₩ 7
Book value	7		7
Fair value	₩ 7		₩ 7
Futech Mold Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	274		274
Ownership	0.27%		0.27%
Acquisition Cost	₩ 14		₩ 14
Book value	14		14
Fair value	₩ 14		₩ 14
Woojoo Environment Ind. Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	101		101
Ownership	0.11%		0.11%
Acquisition Cost	₩ 13		₩ 13
Book value	13		13
Fair value	₩ 13		₩ 13
Hyungji Esquire Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	61		61
Ownership	0.02%		0.02%
Acquisition Cost	₩ 22		₩ 22
Book value	22		22
Fair value	₩ 22		₩ 22
Kolmar Pharma Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,426		1,426
Ownership	0.01%		0.01%
Acquisition Cost	₩ 52		₩ 52
Book value	3		3
Fair value	₩ 3		₩ 3
Morado Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	209		209
Ownership	0.04%		0.04%
Acquisition Cost	₩ 2		₩ 2
Book value	2		2
Fair value	₩ 2		₩ 2
Myung Sung Tex Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	20		20
Ownership	0.00%		0.00%
Acquisition Cost	₩ 2		₩ 2
Book value	2		2
Fair value	₩ 2		₩ 2
Kwang Sung Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	610		610
Ownership	0.53%		0.53%
Acquisition Cost	₩ 31		₩ 31
Book value	31		31
Fair value	₩ 31		₩ 31
Seen Business and Technology co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	29,424		29,424
Ownership	0.73%		0.73%
Acquisition Cost	₩ 148		₩ 147
Book value	7		7
Fair value	₩ 7		₩ 7
Woobang Construction Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	8		8
Ownership	0.00%		0.00%
Acquisition Cost	₩ 8		₩ 8
Book value	8		8
Fair value	₩ 8		₩ 8
Shin Pyung Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	6		6
Ownership	0.03%		0.03%
Acquisition Cost	₩ 3		₩ 3
Book value	3		3
Fair value	₩ 3		₩ 3
JMC Heavy Industries Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	2,724		2,724
Ownership	0.10%		0.10%
Acquisition Cost	₩ 27		₩ 27
Book value	2		2
Fair value	₩ 2		₩ 2
Najin Steel Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	37		37
Ownership	0.06%		0.06%
Acquisition Cost	₩ 5		₩ 5
Book value	5		5
Fair value	₩ 5		₩ 5
Sinkwang Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,091		1,091
Ownership	1.68%		1.68%
Acquisition Cost	₩ 5		₩ 5
Book value	5		5
Fair value	₩ 5		₩ 5
Elephant & Friends Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	563		563
Ownership	0.61%		0.61%
Acquisition Cost	₩ 3		₩ 3
Book value	3		3
Fair value	₩ 3		₩ 3
Mireco Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	109		109
Ownership	0.25%		0.25%
Acquisition Cost	₩ 11		₩ 11
Book value	11		11
Fair value	₩ 11		₩ 11
L&K Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,615		1,615
Ownership	0.60%		0.60%
Acquisition Cost	₩ 24		₩ 24
Book value	24		24
Fair value	₩ 24		₩ 24
JO Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,263		1,263
Ownership	0.62%		0.62%
Acquisition Cost	₩ 25		₩ 25
Book value	25		25
Fair value	₩ 25		₩ 25
Kendae Printing Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	422		422
Ownership	0.60%		0.60%
Acquisition Cost	₩ 21		₩ 21
Book value	21		21
Fair value	₩ 21		₩ 21
Dauning Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	231		231
Ownership	0.41%		0.41%
Acquisition Cost	₩ 6		₩ 6
Book value	6		6
Fair value	₩ 6		₩ 6
Korea Trecision Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	22		22
Ownership	0.45%		0.45%
Acquisition Cost	₩ 5		₩ 5
Book value	5		5
Fair value	₩ 5		₩ 5
Ace Track Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	3,130		3,130
Ownership	1.08%		1.08%
Acquisition Cost	₩ 219		₩ 219
Book value	59		59
Fair value	₩ 59		₩ 59
Yoo-A Construction Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares			105
Ownership			0.20%
Acquisition Cost			₩ 11
Book value			11
Fair value			₩ 11
Dung Hwan Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	556		531
Ownership	0.02%		0.02%
Acquisition Cost	₩ 6		₩ 5
Book value	6		5
Fair value	₩ 6		₩ 5
Hurim Biocell Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,021		1,021
Ownership	0.00%		0.00%
Acquisition Cost	₩ 5		₩ 5
Book value	5		5
Fair value	₩ 5		₩ 5
Smart Power Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	133,333		133,333
Ownership	4.14%		4.14%
Acquisition Cost	₩ 200		₩ 200
Book value	200		200
Fair value	₩ 200		₩ 200
Sunjin Power Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	4,941		4,941
Ownership	0.92%		0.92%
Acquisition Cost	₩ 247		₩ 247
Book value	32		32
Fair value	₩ 32		₩ 32
Haseung Industries Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares			55
Ownership			0.62%
Acquisition Cost			₩ 28
Book value			28
Fair value			₩ 28
Beer Yeast Korea Inc.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,388		1,388
Ownership	0.43%		0.43%
Acquisition Cost	₩ 7		₩ 7
Book value	7		7
Fair value	₩ 7		₩ 7
B CON Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	96		96
Ownership	1.16%		1.16%
Acquisition Cost	₩ 6		₩ 6
Book value	6		6
Fair value	₩ 6		₩ 6
Ace Integration Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	105		105
Ownership	0.09%		0.09%
Acquisition Cost	₩ 24		₩ 23
Book value	24		23
Fair value	₩ 24		₩ 23
AceInti Agricultural Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	16		16
Ownership	0.02%		0.02%
Acquisition Cost	₩ 5		₩ 5
Book value	5		5
Fair value	₩ 5		₩ 5
KyungDong Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	130		130
Ownership	0.01%		0.01%
Acquisition Cost	₩ 1		₩ 1
Book value	1		1
Fair value	₩ 1		₩ 1
ChunWon Development Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	193		193
Ownership	0.19%		0.19%
Acquisition Cost	₩ 39		₩ 39
Book value	39		39
Fair value	₩ 39		₩ 39
SungLim Industrial Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	29		29
Ownership	0.03%		0.03%
Acquisition Cost	₩ 1		₩ 1
Book value	1		1
Fair value	₩ 1		₩ 1
Korea Minerals Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	191		191
Ownership	0.05%		0.05%
Acquisition Cost	₩ 134		₩ 135
Book value	1		1
Fair value	₩ 1		₩ 1
HyoDong Development Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	128		128
Ownership	0.16%		0.15%
Acquisition Cost	₩ 25		₩ 25
Book value	25		25
Fair value	₩ 25		₩ 25
Haspe Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	652		652
Ownership	0.55%		0.55%
Acquisition Cost	₩ 20		₩ 20
Book value	20		20
Fair value	₩ 20		₩ 20
JoHyun Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	350		350
Ownership	1.56%		1.56%
Acquisition Cost	₩ 18		₩ 18
Book value	18		18
Fair value	₩ 18		₩ 18
KC Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	5,107		5,107
Ownership	0.17%		0.17%
Acquisition Cost	₩ 26		₩ 26
Book value	26		26
Fair value	₩ 26		₩ 26
SeongJi Industrial Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	41		41
Ownership	0.05%		0.05%
Acquisition Cost	₩ 1		₩ 1
Book value	1		1
Fair value	₩ 1		₩ 1
Dong Yang Metal Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	2,951		2,951
Ownership	1.97%		1.97%
Acquisition Cost	₩ 161		₩ 161
Book value	147		148
Fair value	₩ 147		₩ 148
Seyang Precision Ind.Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	829		829
Ownership	0.23%		0.23%
Acquisition Cost	₩ 41		₩ 41
Book value	41		41
Fair value	₩ 41		₩ 41
Dooriwon Food System Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	13		13
Ownership	0.27%		0.27%
Acquisition Cost	₩ 1		₩ 1
Book value	1		1
Fair value	₩ 1		₩ 1
ShinShin Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	339		339
Ownership	1.12%		1.12%
Acquisition Cost	₩ 17		₩ 17
Book value	17		17
Fair value	₩ 17		₩ 17
Sung Kwang Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	23		23
Ownership	0.37%		0.37%
Acquisition Cost	₩ 6		₩ 6
Book value	6		6
Fair value	₩ 6		₩ 6
Shinheung petrol. Co. Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	699		699
Ownership	0.14%		0.14%
Acquisition Cost	₩ 35		₩ 35
Book value	35		35
Fair value	₩ 35		₩ 35
Force TEC Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	3,501		3,501
Ownership	0.02%		0.02%
Acquisition Cost	₩ 18		₩ 18
Book value	18		18
Fair value	₩ 18		₩ 18
Samsung Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	486		486
Ownership	1.28%		1.28%
Acquisition Cost	₩ 97		₩ 97
Book value	36		36
Fair value	₩ 36		₩ 36
Tae Hyung Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	28		28
Ownership	0.43%		0.43%
Acquisition Cost	₩ 20		₩ 20
Book value	20		20
Fair value	₩ 20		₩ 20
Younil Metal Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	41		41
Ownership	0.21%		0.21%
Acquisition Cost	₩ 21		₩ 21
Book value	21		21
Fair value	₩ 21		₩ 21
Hankook Precision Ind Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	110		110
Ownership	0.06%		0.06%
Acquisition Cost	₩ 3		₩ 11
Book value	3		3
Fair value	₩ 3		₩ 3
Borneo International Furniture Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares			4,000
Ownership			0.16%
Acquisition Cost			₩ 97
Book value			13
Fair value			₩ 13
CJ Paradise Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	24		24
Ownership	0.02%		0.02%
Acquisition Cost	₩ 12		₩ 12
Book value	12		12
Fair value	₩ 12		₩ 12
Han Young Technology Company Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	35		35
Ownership	0.00%		0.00%
Acquisition Cost	₩ 0		₩ 0
Book value	0		0
Fair value	₩ 0		₩ 0
STX Offshore & Shipbuilding Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	8,622		8,622
Ownership	0.25%		0.25%
Acquisition Cost	₩ 1,078		₩ 1,078
Book value	1,078		1,078
Fair value	₩ 1,078		₩ 1,078
Ptotronics Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	843		843
Ownership	0.42%		0.42%
Acquisition Cost	₩ 84		₩ 84
Book value	6		6
Fair value	₩ 6		₩ 6
NFT Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	136		136
Ownership	0.40%		0.40%
Acquisition Cost	₩ 8		₩ 8
Book value	8		8
Fair value	₩ 8		₩ 8
Echoroba Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares			157
Ownership			0.02%
Acquisition Cost			₩ 3
Book value			3
Fair value			₩ 3
Hyundaitech Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,363		1,363
Ownership	0.87%		0.87%
Acquisition Cost	₩ 27		₩ 27
Book value	27		27
Fair value	₩ 27		₩ 27
Dasan Material Co.Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	29		29
Ownership	0.04%		0.04%
Acquisition Cost	₩ 22		₩ 22
Book value	22		22
Fair value	₩ 22		₩ 22
Fish World Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	47		47
Ownership	0.21%		0.21%
Acquisition Cost	₩ 2		₩ 2
Book value	2		2
Fair value	₩ 2		₩ 2
SG Shinsung Engineering and Construction Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	10		10
Ownership	0.00%		0.00%
Acquisition Cost	₩ 6		₩ 6
Book value	6		6
Fair value	₩ 6		₩ 6
Samdo Industry Electric Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	48		48
Ownership	0.02%		0.02%
Acquisition Cost	₩ 1		₩ 1
Book value	1		1
Fair value	₩ 1		₩ 1
Taejung Industries Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	9,268		9,268
Ownership	0.30%		0.30%
Acquisition Cost	₩ 5		₩ 5
Book value	5		5
Fair value	₩ 5		₩ 5
Shinsei Trading Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	64		64
Ownership	0.72%		0.72%
Acquisition Cost	₩ 6		₩ 6
Book value	6		6
Fair value	₩ 6		₩ 6
Dynamic Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	111		111
Ownership	0.19%		0.19%
Acquisition Cost	₩ 3		₩ 3
Book value	3		3
Fair value	₩ 3		₩ 3
Green Alchemy Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	38,202		38,202
Ownership	1.48%		1.48%
Acquisition Cost	₩ 191		₩ 191
Book value	17		17
Fair value	₩ 17		₩ 17
Youone TBM Engineering & Construction Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	615		615
Ownership	0.27%		0.27%
Acquisition Cost	₩ 31		₩ 31
Book value	31		31
Fair value	₩ 31		₩ 31
KM Leatech
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,648		1,648
Ownership	0.98%		0.98%
Acquisition Cost	₩ 8		₩ 8
Book value	8		8
Fair value	₩ 8		₩ 8
Semist Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	555		555
Ownership	0.80%		0.80%
Acquisition Cost	₩ 3		₩ 3
Book value	3		3
Fair value	₩ 3		₩ 3
Sewon Bus Co.,Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	12		12
Ownership	0.00%		0.00%
Acquisition Cost	₩ 0		₩ 0
Book value	0		0
Fair value	₩ 0		₩ 0
Enertec Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	7,937		7,937
Ownership	0.19%		0.19%
Acquisition Cost	₩ 44		₩ 44
Book value	44		44
Fair value	₩ 44		₩ 44
Sangji Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	20		20
Ownership	0.26%		0.26%
Acquisition Cost	₩ 4		₩ 4
Book value	4		4
Fair value	₩ 4		₩ 4
Bellie Doughnuts Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	169		64
Ownership	0.19%		0.07%
Acquisition Cost	₩ 10		₩ 4
Book value	10		4
Fair value	₩ 10		₩ 4
Possbell Engineering Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares			36
Ownership			0.64%
Acquisition Cost			₩ 1
Book value			1
Fair value			₩ 1
AIRTECH Information communication Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	2,379		2,379
Ownership	0.60%		0.60%
Acquisition Cost	₩ 12		₩ 12
Book value	12		12
Fair value	₩ 12		₩ 12
Shin kwang Industrial Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	884		884
Ownership	0.35%		0.35%
Acquisition Cost	₩ 55		₩ 55
Book value	55		55
Fair value	₩ 55		₩ 55
Kiscom Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,493		1,493
Ownership	0.04%		0.04%
Acquisition Cost	₩ 1		₩ 1
Book value	1		1
Fair value	₩ 1		₩ 1
Wonil laser Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	157		157
Ownership	0.37%		0.37%
Acquisition Cost	₩ 16		₩ 16
Book value	16		16
Fair value	₩ 16		₩ 16
Pyung Hwa Industrial Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	3,388		3,388
Ownership	3.00%		3.00%
Acquisition Cost	₩ 85		₩ 85
Book value	85		85
Fair value	₩ 85		₩ 85
PT. Kedap Sayaaq
Financial assets at fair value through other comprehensive income [Line Items]
Shares	671		671
Ownership	10.00%		10.00%
Acquisition Cost	₩ 18,540		₩ 18,540
Book value	0		0
Fair value	₩ 0		₩ 0
Set Holding
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,100,220		1,100,220
Ownership	2.50%		2.50%
Acquisition Cost	₩ 229,255		₩ 229,255
Book value	143,765		166,863
Fair value	₩ 143,765	[3]	₩ 166,863	[4]
PT. Cirebon Energi Prasarana
Financial assets at fair value through other comprehensive income [Line Items]
Shares	22,420		22,420
Ownership	10.00%		10.00%
Acquisition Cost	₩ 2,612		₩ 2,612
Book value	2,440		2,596
Fair value	₩ 2,440		₩ 2,596
Choheung packing Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	61		61
Ownership	0.13%		0.13%
Acquisition Cost	₩ 12		₩ 12
Book value	12		12
Fair value	₩ 12		₩ 12
Jaewoo Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	359		359
Ownership	0.24%		0.24%
Acquisition Cost	₩ 11		₩ 11
Book value	11		11
Fair value	₩ 11		₩ 11
Wooyang HC Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,375		1,375
Ownership	0.01%		0.01%
Acquisition Cost	₩ 159		₩ 159
Book value	159		159
Fair value	₩ 159		₩ 159
Sungsan Parts Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	629		629
Ownership	0.80%		0.80%
Acquisition Cost	₩ 63		₩ 63
Book value	63		63
Fair value	₩ 63		₩ 63
KMT Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares			1,411
Ownership			0.93%
Acquisition Cost			₩ 21
Book value			21
Fair value			₩ 21
TheYeonriji Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	116		116
Ownership	0.10%		0.10%
Acquisition Cost	₩ 6		₩ 6
Book value	6		6
Fair value	₩ 6		₩ 6
Flusys Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	9		9
Ownership	0.08%		0.08%
Acquisition Cost	₩ 2		₩ 2
Book value	2		2
Fair value	₩ 2		₩ 2
DongSeo Electronics Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	347		323
Ownership	0.07%		0.07%
Acquisition Cost	₩ 17		₩ 16
Book value	17		16
Fair value	₩ 17		₩ 16
Daewoo Display Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	177		177
Ownership	0.03%		0.03%
Acquisition Cost	₩ 5		₩ 5
Book value	5		5
Fair value	₩ 5		₩ 5
Yeong-gwang Remicon Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	15		15
Ownership	0.12%		0.12%
Acquisition Cost	₩ 2		₩ 2
Book value	2		2
Fair value	₩ 2		₩ 2
NTS Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	143		143
Ownership	0.22%		0.22%
Acquisition Cost	₩ 36		₩ 36
Book value	36		36
Fair value	₩ 36		₩ 36
AID CO.,LTD.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,212		1,212
Ownership	0.57%		0.57%
Acquisition Cost	₩ 36		₩ 36
Book value	36		36
Fair value	₩ 36		₩ 36
Changwon Eco-friendly farming corporation
Financial assets at fair value through other comprehensive income [Line Items]
Shares	3		3
Ownership	0.01%		0.01%
Acquisition Cost	₩ 0		₩ 0
Book value	0		0
Fair value	₩ 0		₩ 0
Kumo Hitech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	6,697		6,697
Ownership	0.53%		0.53%
Acquisition Cost	₩ 100		₩ 100
Book value	100		100
Fair value	₩ 100		₩ 100
Kyung Pyo Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	186		186
Ownership	0.76%		0.76%
Acquisition Cost	₩ 19		₩ 19
Book value	19		19
Fair value	₩ 19		₩ 19
Daedong Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	617		617
Ownership	0.55%		0.55%
Acquisition Cost	₩ 46		₩ 46
Book value	46		46
Fair value	₩ 46		₩ 46
Doosung Heavy Industries Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	53		53
Ownership	0.06%		0.06%
Acquisition Cost	₩ 5		₩ 5
Book value	5		5
Fair value	₩ 5		₩ 5
Samjoo Hightech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	522		522
Ownership	0.08%		0.08%
Acquisition Cost	₩ 3		₩ 3
Book value	3		3
Fair value	₩ 3		₩ 3
Samkwang Chemical Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	204		204
Ownership	1.27%		1.27%
Acquisition Cost	₩ 51		₩ 51
Book value	51		51
Fair value	₩ 51		₩ 51
SG Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	213		213
Ownership	0.54%		0.54%
Acquisition Cost	₩ 21		₩ 21
Book value	21		21
Fair value	₩ 21		₩ 21
Shinseung Chemical Industy Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	5		5
Ownership	0.01%		0.01%
Acquisition Cost	₩ 60		₩ 60
Book value	60		60
Fair value	₩ 60		₩ 60
KJ Alloy Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	368		368
Ownership	0.20%		0.20%
Acquisition Cost	₩ 7		₩ 7
Book value	7		7
Fair value	₩ 7		₩ 7
SM Hi-tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	22		22
Ownership	0.39%		0.39%
Acquisition Cost	₩ 22		₩ 22
Book value	22		22
Fair value	₩ 22		₩ 22
Keum Mun Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,320		1,320
Ownership	0.97%		0.97%
Acquisition Cost	₩ 330		₩ 330
Book value	56		56
Fair value	₩ 56		₩ 56
Puruen Environment Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	967		967
Ownership	1.34%		1.34%
Acquisition Cost	₩ 19		₩ 19
Book value	19		19
Fair value	₩ 19		₩ 19
Miretech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	9,111		9,111
Ownership	0.27%		0.27%
Acquisition Cost	₩ 18		₩ 18
Book value	18		18
Fair value	₩ 18		₩ 18
SIE Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	12		12
Ownership	0.02%		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	17,980		17,980
Ownership	0.16%		0.16%
Acquisition Cost	₩ 18		₩ 18
Book value	18		18
Fair value	₩ 18		₩ 18
Namcheong Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares			7,096
Ownership			0.28%
Acquisition Cost			₩ 284
Book value			11
Fair value			₩ 11
Eun Sung Enterprise Co.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,131		1,131
Ownership	0.72%		0.72%
Acquisition Cost	₩ 17		₩ 17
Book value	17		17
Fair value	₩ 17		₩ 17
Dongdo Basalt Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	182		182
Ownership	1.50%		1.50%
Acquisition Cost	₩ 73		₩ 73
Book value	73		73
Fair value	₩ 73		₩ 73
Shinyoung Textiles Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	523		523
Ownership	1.01%		1.01%
Acquisition Cost	₩ 52		₩ 52
Book value	23		23
Fair value	₩ 23		₩ 23
Bugook Cast Iron Co.
Financial assets at fair value through other comprehensive income [Line Items]
Shares			135
Ownership			0.71%
Acquisition Cost			₩ 14
Book value			14
Fair value			₩ 14
Ilwoo Steel Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	41		41
Ownership	0.28%		0.28%
Acquisition Cost	₩ 17		₩ 17
Book value	17		17
Fair value	₩ 17		₩ 17
Dong-un Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,159		1,159
Ownership	6.28%		6.28%
Acquisition Cost	₩ 81		₩ 81
Book value	81		81
Fair value	₩ 81		₩ 81
Wongwang Door Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	575		575
Ownership	1.00%		1.00%
Acquisition Cost	₩ 29		₩ 29
Book value	29		29
Fair value	₩ 29		₩ 29
Seobu Highway Solar Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	19,460		19,460
Ownership	2.86%		10.00%
Acquisition Cost	₩ 195		₩ 192
Book value	195		192
Fair value	₩ 195		₩ 192
Dongbu Highway Solar Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	19,020		19,020
Ownership	4.99%		4.99%
Acquisition Cost	₩ 190		₩ 192
Book value	190		192
Fair value	₩ 190		₩ 192
Muan sunshine solar power plant
Financial assets at fair value through other comprehensive income [Line Items]
Shares			298,300
Ownership			19.00%
Acquisition Cost			₩ 1,492
Book value			1,492
Fair value			₩ 1,492
mansu Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	344		344
Ownership	0.25%		0.25%
Acquisition Cost	₩ 15		₩ 15
Book value	15		15
Fair value	₩ 15		₩ 15
Eanskorea Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	39		39
Ownership	0.05%		0.05%
Acquisition Cost	₩ 2		₩ 2
Book value	2		2
Fair value	₩ 2		₩ 2
Youngdongseafood Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	165		165
Ownership	0.33%		0.33%
Acquisition Cost	₩ 8		₩ 8
Book value	8		8
Fair value	₩ 8		₩ 8
Hyunwoo Winstar Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1		1
Ownership	0.00%		0.00%
Acquisition Cost	₩ 0		₩ 0
Book value	0		0
Fair value	₩ 0		₩ 0
Sehwa Diecasting Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	299		299
Ownership	1.66%		1.66%
Acquisition Cost	₩ 44		₩ 44
Book value	44		44
Fair value	₩ 44		₩ 44
Sungchang Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	159		159
Ownership	0.31%		0.31%
Acquisition Cost	₩ 10		₩ 10
Book value	10		10
Fair value	₩ 10		₩ 10
Yuchang Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	90		90
Ownership	0.11%		0.11%
Acquisition Cost	₩ 5		₩ 5
Book value	5		5
Fair value	₩ 5		₩ 5
Jeongpum Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	322		322
Ownership	0.35%		0.35%
Acquisition Cost	₩ 16		₩ 16
Book value	16		16
Fair value	₩ 16		₩ 16
Korea Steel Power Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	2,761		2,761
Ownership	1.88%		1.88%
Acquisition Cost	₩ 55		₩ 55
Book value	55		55
Fair value	₩ 55		₩ 55
DMC Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares			5,831
Ownership			0.02%
Acquisition Cost			₩ 38
Book value			38
Fair value			₩ 38
Amanex Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	10		10
Ownership	0.02%		0.02%
Acquisition Cost	₩ 9		₩ 9
Book value	9		9
Fair value	₩ 9		₩ 9
Dae-A Leisure Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	23		23
Ownership	0.00%		0.00%
Acquisition Cost	₩ 4		₩ 4
Book value	4		4
Fair value	₩ 4		₩ 4
Caffe Bene Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,908		1,908
Ownership	0.03%		0.03%
Acquisition Cost	₩ 2		₩ 2
Book value	2		2
Fair value	₩ 2		₩ 2
Daechang HRSG Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	618		618
Ownership	0.12%		0.12%
Acquisition Cost	₩ 62		₩ 62
Book value	62		62
Fair value	₩ 62		₩ 62
Shinjin International Corp.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	4		4
Ownership	0.01%		0.01%
Acquisition Cost	₩ 1		₩ 1
Book value	1		1
Fair value	₩ 1		₩ 1
Daewoon Shell Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	666		666
Ownership	2.81%		2.81%
Acquisition Cost	₩ 33		₩ 33
Book value	33		33
Fair value	₩ 33		₩ 33
Jinhung Packaging Co.,Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	4,329		4,329
Ownership	3.02%		3.02%
Acquisition Cost	₩ 22		₩ 9
Book value	22		22
Fair value	₩ 22		₩ 22
Donglim Eng Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	26		26
Ownership	0.11%		0.11%
Acquisition Cost	₩ 3		₩ 3
Book value	3		3
Fair value	₩ 3		₩ 3
SIP Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	274		274
Ownership	0.55%		0.55%
Acquisition Cost	₩ 7		₩ 7
Book value	7		7
Fair value	₩ 7		₩ 7
Clizen Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	615		615
Ownership	0.34%		0.34%
Acquisition Cost	₩ 31		₩ 31
Book value	31		31
Fair value	₩ 31		₩ 31
DAEDONGMILLENNIUM Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	159		159
Ownership	0.42%		0.42%
Acquisition Cost	₩ 32		₩ 32
Book value	32		32
Fair value	₩ 32		₩ 32
Daeji Product Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	15		15
Ownership	0.05%		0.05%
Acquisition Cost	₩ 1		₩ 1
Book value	0		0
Fair value	₩ 0		₩ 0
Cheong Hae Myeong Ga Co.,Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,867		1,867
Ownership	0.11%		0.11%
Acquisition Cost	₩ 5		₩ 5
Book value	5		5
Fair value	₩ 5		₩ 5
Shinhan Sangi Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares			29
Ownership			0.20%
Acquisition Cost			₩ 4
Book value			4
Fair value			₩ 4
Jaein Circuit Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	498		498
Ownership	1.12%		1.12%
Acquisition Cost	₩ 65		₩ 65
Book value	65		65
Fair value	₩ 65		₩ 65
SSET Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	181		181
Ownership	0.30%		0.30%
Acquisition Cost	₩ 18		₩ 18
Book value	18		18
Fair value	₩ 18		₩ 18
Sewon PM Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	963		963
Ownership	1.11%		1.11%
Acquisition Cost	₩ 48		₩ 48
Book value	48		48
Fair value	₩ 48		₩ 48
Dawon Yuhwa Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	506		506
Ownership	1.94%		1.94%
Acquisition Cost	₩ 25		₩ 25
Book value	25		25
Fair value	₩ 25		₩ 25
Ogokbaekkwa Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	101		101
Ownership	0.12%		0.12%
Acquisition Cost	₩ 1		₩ 1
Book value	1		1
Fair value	₩ 1		₩ 1
Shinwonn Toptech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	834		834
Ownership	0.51%		0.51%
Acquisition Cost	₩ 83		₩ 83
Book value	83		83
Fair value	₩ 83		₩ 83
KMLC Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	281		281
Ownership	0.14%		0.14%
Acquisition Cost	₩ 22		₩ 22
Book value	22		22
Fair value	₩ 22		₩ 22
Seinfood Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	13		13
Ownership	0.17%		0.17%
Acquisition Cost	₩ 7		₩ 7
Book value	7		7
Fair value	₩ 0		₩ 7
TaeSung Eco-Tech. Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,368		1,368
Ownership	4.55%		4.55%
Acquisition Cost	₩ 34		₩ 34
Book value	34		34
Fair value	₩ 34		₩ 34
Kukex Inc.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	639		639
Ownership	0.05%		0.05%
Acquisition Cost	₩ 3		₩ 3
Book value	3		3
Fair value	₩ 3		₩ 3
Youngshin Plu Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	104		104
Ownership	0.12%		0.12%
Acquisition Cost	₩ 5		₩ 5
Book value	5		5
Fair value	₩ 5		₩ 5
Chang won Engineering Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	22		22
Ownership	0.00%		0.00%
Acquisition Cost	₩ 4		₩ 4
Book value	4		4
Fair value	₩ 4		₩ 4
Samsung Silup Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	47		47
Ownership	0.19%		0.19%
Acquisition Cost	₩ 5		₩ 5
Book value	5		5
Fair value	₩ 5		₩ 5
Samwon Bio Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	390		390
Ownership	0.25%		0.25%
Acquisition Cost	₩ 6		₩ 6
Book value	6		6
Fair value	₩ 6		₩ 6
IZU KOREA Co. Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	48		48
Ownership	0.00%		0.00%
Acquisition Cost	₩ 2		₩ 2
Book value	2		2
Fair value	₩ 2		₩ 2
Dongdo CNP Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	234		234
Ownership	0.36%		0.36%
Acquisition Cost	₩ 6		₩ 6
Book value	6		6
Fair value	₩ 6		₩ 6
Hando Precision Co.,Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares			38
Ownership			0.26%
Acquisition Cost			₩ 4
Book value			4
Fair value			₩ 4
Dae Bang Industry Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	115		115
Ownership	0.13%		0.13%
Acquisition Cost	₩ 6		₩ 6
Book value	6		6
Fair value	₩ 6		₩ 6
S.I.T. Co.,Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	2,213		2,213
Ownership	0.44%		0.44%
Acquisition Cost	₩ 22		₩ 22
Book value	22		22
Fair value	₩ 22		₩ 22
Taejin Hiech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	78		78
Ownership	0.26%		0.26%
Acquisition Cost	₩ 3		₩ 3
Book value	3		3
Fair value	₩ 3		₩ 3
Headone Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	69		69
Ownership	0.12%		0.12%
Acquisition Cost	₩ 7		₩ 7
Book value	7		7
Fair value	₩ 7		₩ 7
Enaindustry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	201		201
Ownership	0.28%		0.09%
Acquisition Cost	₩ 141		₩ 141
Book value	141		141
Fair value	₩ 141		₩ 141
TCT Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	3,277		3,277
Ownership	0.55%		0.55%
Acquisition Cost	₩ 82		₩ 82
Book value	82		82
Fair value	₩ 82		₩ 82
E-Won Solutech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	158		158
Ownership	0.16%		0.16%
Acquisition Cost	₩ 40		₩ 40
Book value	40		40
Fair value	₩ 40		₩ 40
MJT Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,013		1,013
Ownership	0.20%		0.20%
Acquisition Cost	₩ 51		₩ 51
Book value	51		51
Fair value	₩ 51		₩ 51
KPL Circuit Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	283		283
Ownership	0.08%		0.08%
Acquisition Cost	₩ 14		₩ 14
Book value	14		14
Fair value	₩ 14		₩ 14
Road Solar Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	12		12
Ownership	0.00%		0.00%
Acquisition Cost	₩ 0		₩ 0
Book value	0		0
Fair value	₩ 0		₩ 0
Sung Ae Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	190		190
Ownership	0.80%		0.80%
Acquisition Cost	₩ 10		₩ 10
Book value	10		10
Fair value	₩ 10		₩ 10
Han Mi Flexible Co.,Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	143		143
Ownership	0.20%		0.20%
Acquisition Cost	₩ 43		₩ 43
Book value	43		43
Fair value	₩ 43		₩ 43
Samhwa Casting Co. Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	200		200
Ownership	0.04%		0.00%
Acquisition Cost	₩ 100		₩ 100
Book value	100		100
Fair value	₩ 100		₩ 100
Millennium PNT Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	227		227
Ownership	0.37%		0.37%
Acquisition Cost	₩ 6		₩ 6
Book value	6		6
Fair value	₩ 6		₩ 6
GN Chem Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	40		40
Ownership	0.07%		0.07%
Acquisition Cost	₩ 1		₩ 1
Book value	1		1
Fair value	₩ 1		₩ 1
GW Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	505		505
Ownership	0.07%		0.07%
Acquisition Cost	₩ 51		₩ 51
Book value	51		51
Fair value	₩ 51		₩ 51
TM Construction co. Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	4		4
Ownership	0.00%		0.00%
Acquisition Cost	₩ 0		₩ 0
Book value	0		0
Fair value	₩ 0		₩ 0
Dae Myung Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	114		114
Ownership	0.08%		0.08%
Acquisition Cost	₩ 3		₩ 3
Book value	3		3
Fair value	₩ 3		₩ 3
Nanomicart Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	176		176
Ownership	1.06%		1.06%
Acquisition Cost	₩ 35		₩ 35
Book value	35		35
Fair value	₩ 35		₩ 35
Young San Heavy Industries Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	74		74
Ownership	0.11%		0.11%
Acquisition Cost	₩ 7		₩ 7
Book value	7		7
Fair value	₩ 7		₩ 7
Samchungwon Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	15		15
Ownership	0.24%		0.24%
Acquisition Cost	₩ 2		₩ 2
Book value	2		2
Fair value	₩ 2		₩ 2
Wooyang Frozen Foods Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	66		66
Ownership	0.82%		0.82%
Acquisition Cost	₩ 27		₩ 27
Book value	27		27
Fair value	₩ 27		₩ 27
Nanomic Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	94		94
Ownership	0.63%		0.63%
Acquisition Cost	₩ 38		₩ 38
Book value	38		38
Fair value	₩ 38		₩ 38
Dong Hwan Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares			25
Ownership			0.02%
Acquisition Cost			₩ 1
Book value			1
Fair value			₩ 1
Samsung Nonferrous Metal Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	89
Ownership	0.26%
Acquisition Cost	₩ 9
Book value	9
Fair value	₩ 9
Daewha Fuel Pump Ind., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	83
Ownership	0.05%
Acquisition Cost	₩ 10
Book value	10
Fair value	₩ 10
HIC Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	7,408
Ownership	0.71%
Acquisition Cost	₩ 111
Book value	111
Fair value	₩ 111
Addies Direct Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1
Ownership	0.00%
Acquisition Cost	₩ 0
Book value	0
Fair value	₩ 0
WorldCnM Inc.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	131
Ownership	1.09%
Acquisition Cost	₩ 10
Book value	10
Fair value	₩ 10
Superone Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,585
Ownership	1.45%
Acquisition Cost	₩ 8
Book value	8
Fair value	₩ 8
Deok-u Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,626
Ownership	1.92%
Acquisition Cost	₩ 195
Book value	195
Fair value	₩ 195
Buyoung Panji Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	478
Ownership	0.44%
Acquisition Cost	₩ 12
Book value	12
Fair value	₩ 12
International Paint Korea Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	111
Ownership	0.48%
Acquisition Cost	₩ 11
Book value	11
Fair value	₩ 11
EI Lighting Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	358
Ownership	0.36%
Acquisition Cost	₩ 18
Book value	18
Fair value	₩ 18
Hightech Mnp Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	123
Ownership	0.35%
Acquisition Cost	₩ 6
Book value	6
Fair value	₩ 6
Dongjin Foundry Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	966
Ownership	4.10%
Acquisition Cost	₩ 193
Book value	193
Fair value	₩ 193
Yooseung Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	10
Ownership	0.08%
Acquisition Cost	₩ 1
Book value	1
Fair value	₩ 1
Sungkwang Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	48
Ownership	0.35%
Acquisition Cost	₩ 2
Book value	2
Fair value	₩ 2
Taeyang gasteel Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	8
Ownership	0.02%
Acquisition Cost	₩ 1
Book value	1
Fair value	₩ 1
Ajin KSB Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	204
Ownership	0.31%
Acquisition Cost	₩ 18
Book value	18
Fair value	₩ 18
Sewon Ceramic Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	530
Ownership	1.01%
Acquisition Cost	₩ 5
Book value	5
Fair value	₩ 5
Choyang Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	465
Ownership	1.01%
Acquisition Cost	₩ 23
Book value	23
Fair value	₩ 23
TK Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	307
Ownership	0.70%
Acquisition Cost	₩ 15
Book value	15
Fair value	₩ 0
Sungdo Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	130
Ownership	1.10%
Acquisition Cost	₩ 52
Book value	52
Fair value	₩ 52
KSM Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	25
Ownership	0.11%
Acquisition Cost	₩ 1
Book value	1
Fair value	₩ 1
Arari Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	14
Ownership	0.05%
Acquisition Cost	₩ 1
Book value	1
Fair value	₩ 1
Potech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	39
Ownership	0.13%
Acquisition Cost	₩ 14
Book value	14
Fair value	₩ 14
C&S Corporation Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,304
Ownership	0.01%
Acquisition Cost	₩ 13
Book value	13
Fair value	₩ 13
Sungshin Parts Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	345
Ownership	0.40%
Acquisition Cost	₩ 14
Book value	14
Fair value	₩ 14
Global The One of Korea Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	62
Ownership	0.06%
Acquisition Cost	₩ 3
Book value	3
Fair value	₩ 3
Steellife Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	85
Ownership	0.06%
Acquisition Cost	₩ 4
Book value	4
Fair value	₩ 4
D&C Castech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	330
Ownership	1.89%
Acquisition Cost	₩ 25
Book value	25
Fair value	₩ 25
Geumhan Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	498
Ownership	0.24%
Acquisition Cost	₩ 7
Book value	7
Fair value	₩ 7
Mokgan Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	5
Ownership	0.02%
Acquisition Cost	₩ 1
Book value	1
Fair value	₩ 1
Wenex Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	373
Ownership	0.53%
Acquisition Cost	₩ 19
Book value	19
Fair value	₩ 19
Sulim Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	30
Ownership	0.20%
Acquisition Cost	₩ 6
Book value	6
Fair value	₩ 6
Shinkwang Engineering
Financial assets at fair value through other comprehensive income [Line Items]
Shares	24
Ownership	0.36%
Acquisition Cost	₩ 2
Book value	2
Fair value	₩ 2
Ek Cookware Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	60
Ownership	0.04%
Acquisition Cost	₩ 1
Book value	1
Fair value	₩ 1
KTTW Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	28
Ownership	0.05%
Acquisition Cost	₩ 2
Book value	2
Fair value	₩ 2
Avajar Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,061
Ownership	0.01%
Acquisition Cost	₩ 1
Book value	1
Fair value	₩ 1
Koomin Precisions Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	124
Ownership	0.26%
Acquisition Cost	₩ 12
Book value	12
Fair value	₩ 12
Woosung I.B. Co.,Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	7,071
Ownership	0.07%
Acquisition Cost	₩ 14
Book value	14
Fair value	₩ 14
CAP Korea Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	16
Ownership	0.30%
Acquisition Cost	₩ 3
Book value	3
Fair value	₩ 3
MSM Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	25
Ownership	0.08%
Acquisition Cost	₩ 0
Book value	0
Fair value	₩ 0
Ddpopstyle Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	22
Ownership	0.14%
Acquisition Cost	₩ 1
Book value	1
Fair value	₩ 1
Finemetal Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	49
Ownership	0.08%
Acquisition Cost	₩ 1
Book value	1
Fair value	₩ 1
Sungkyeong Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	52
Ownership	0.24%
Acquisition Cost	₩ 2
Book value	2
Fair value	₩ 2
RMK Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	63
Ownership	0.90%
Acquisition Cost	₩ 22
Book value	22
Fair value	₩ 22
Tpp Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	36,645
Ownership	11.72%
Acquisition Cost	₩ 1,832
Book value	1,832
Fair value	₩ 1,832
Kuklim Plastic New Technology Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	393
Ownership	0.29%
Acquisition Cost	₩ 8
Book value	8
Fair value	₩ 8
Dukeong Metal Heat Treatment Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	843
Ownership	3.61%
Acquisition Cost	₩ 84
Book value	84
Fair value	₩ 84
Newko Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	331
Ownership	0.06%
Acquisition Cost	₩ 10
Book value	10
Fair value	₩ 10
KMC&R Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	16
Ownership	0.11%
Acquisition Cost	₩ 1
Book value	1
Fair value	₩ 1
Dongsung Mulsan Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	137
Ownership	0.34%
Acquisition Cost	₩ 14
Book value	14
Fair value	₩ 14
Pizzakorea Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	42
Ownership	0.18%
Acquisition Cost	₩ 9
Book value	9
Fair value	₩ 9
Geumdani Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	2,377
Ownership	1.82%
Acquisition Cost	₩ 36
Book value	36
Fair value	₩ 36
Mezzanine I-pack Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	38
Ownership	0.02%
Acquisition Cost	₩ 1
Book value	1
Fair value	₩ 1
Newclean Livestock Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	86
Ownership	0.17%
Acquisition Cost	₩ 4
Book value	4
Fair value	₩ 4
Ltop Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	36
Ownership	0.06%
Acquisition Cost	₩ 7
Book value	7
Fair value	₩ 7
Simile Aluminium Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	428
Ownership	0.31%
Acquisition Cost	₩ 9
Book value	9
Fair value	₩ 9
GT Tooling Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	604
Ownership	0.17%
Acquisition Cost	₩ 6
Book value	6
Fair value	₩ 6
Panax Korea Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	58
Ownership	0.14%
Acquisition Cost	₩ 9
Book value	9
Fair value	₩ 9
Team Korea Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	4,782
Ownership	0.37%
Acquisition Cost	₩ 24
Book value	24
Fair value	₩ 24
Donghwa TCA Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,012
Ownership	0.30%
Acquisition Cost	₩ 25
Book value	25
Fair value	₩ 25
Hankook Piaget Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	4
Ownership	0.01%
Acquisition Cost	₩ 1
Book value	1
Fair value	₩ 1
Coco Food Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	648
Ownership	1.24%
Acquisition Cost	₩ 33
Book value	33
Fair value	₩ 33
Woori Industry Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	102
Ownership	1.05%
Acquisition Cost	₩ 21
Book value	21
Fair value	₩ 21
Para Belleza Co., Ltd
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,211
Ownership	1.74%
Acquisition Cost	₩ 74
Book value	74
Fair value	₩ 74
Dongsung Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,983
Ownership	1.63%
Acquisition Cost	₩ 198
Book value	198
Fair value	₩ 198
Ssangyong Youngweol Plant Service&Engineering Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	83
Ownership	0.07%
Acquisition Cost	₩ 4
Book value	4
Fair value	₩ 4
SH Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	31
Ownership	0.20%
Acquisition Cost	₩ 6
Book value	6
Fair value	₩ 6
Namsunnam Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	1,275
Ownership	0.19%
Acquisition Cost	₩ 6
Book value	6
Fair value	₩ 6
Daeyoung Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	75
Ownership	0.01%
Acquisition Cost	₩ 8
Book value	8
Fair value	₩ 8
Chandown Food Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	46
Ownership	0.14%
Acquisition Cost	₩ 9
Book value	9
Fair value	₩ 9
Getron Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	7,259
Ownership	0.20%
Acquisition Cost	₩ 37
Book value	37
Fair value	₩ 37
Jungmun Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	19
Ownership	0.26%
Acquisition Cost	₩ 2
Book value	2
Fair value	₩ 2
Andong Trading Corporation Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	42
Ownership	0.00%
Acquisition Cost	₩ 2
Book value	2
Fair value	₩ 2
JM Tech Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	403
Ownership	0.67%
Acquisition Cost	₩ 82
Book value	82
Fair value	₩ 82
SGC Energy Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	580,000
Ownership	5.00%
Acquisition Cost	₩ 2,900
Book value	2,900
Fair value	₩ 2,900
Ihsung CNI Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	13,526
Ownership	18.22%
Acquisition Cost	₩ 3,000
Book value	3,000
Fair value	₩ 3,000
H Robotics Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	9,192
Ownership	4.55%
Acquisition Cost	₩ 1,000
Book value	1,000
Fair value	₩ 1,000
Good Tcells Co., Ltd.
Financial assets at fair value through other comprehensive income [Line Items]
Shares	11,364
Ownership	0.34%
Acquisition Cost	₩ 500
Book value	500
Fair value	₩ 500
[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 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.
[3]	The Company has estimated the fair value of Set Holding by using the discounted cash flow method and has recognized the difference between its fair value and book value as gain or loss on valuation of financial assets at FVOCI in other comprehensive income or loss for the year ended December 31, 2020.
[4]	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 for the year ended December 31, 2019.

Financial Assets at Amortized_3

Financial Assets at Amortized Cost (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Financial Assets at Amortized Cost [Line Items]
Current financial assets at amortized costs	₩ 13,149	₩ 12,302
Non-current financial assets at amortized costs	1,273	1,307
Financial assets at amortized costs	14,422	13,609
Gross carrying amount [Member]
Financial Assets at Amortized Cost [Line Items]
Current financial assets at amortized costs	13,149	12,302
Non-current financial assets at amortized costs	1,273	1,307
Financial assets at amortized costs	14,422	13,609
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
Government bonds
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	1,422	1,609
Government bonds | Gross carrying amount [Member]
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	1,422	1,609
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
Others
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	13,000	12,000
Others | Gross carrying amount [Member]
Financial Assets at Amortized Cost [Line Items]
Financial assets at amortized costs	13,000	12,000
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

Derivative Instrument (Details)

Derivative Instrument (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Current derivative financial assets		₩ 29,525		₩ 27,618
Non-current derivative financial assets		136,888		283,415
Current derivative financial liabilities		49,884		73,064
Non-current derivative financial liabilities		315,235		96,896
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)		(455,715)		317,350	₩ 153,203
Net income effects of transaction gain (loss)		65,393		86,415	147,297
Accumulated other comprehensive income (loss)		111,220	[1]	35,727	(6,429)
Currency forward | Not Designated as Hedging Instrument
Derivative [Line Items]
Current derivative financial assets		18,332		21
Non-current derivative financial assets		0		43,931
Current derivative financial liabilities		10,014		7,081
Non-current derivative financial liabilities		4,977		0
Disclosure of Gain and loss on valuation and transaction of derivatives and included in finance income and costs in the consolidated statements of comprehensive income (loss)
Net income effects of valuation gain (loss)		(40,590)		24,265	12,632
Net income effects of transaction gain (loss)		(17,911)		12,488	23,991
Accumulated other comprehensive income (loss)		0	[1]	0	0
Currency swap
Derivative [Line Items]
Current derivative financial assets		11,193		27,597
Non-current derivative financial assets		127,386		229,258
Current derivative financial liabilities		36,088		59,327
Non-current derivative financial liabilities		232,669		45,184
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)		(406,607)		310,732	145,088
Net income effects of transaction gain (loss)		93,557		110,813	123,670
Accumulated other comprehensive income (loss)		105,642	[1]	38,802	(12,516)
Currency swap | Not Designated as Hedging Instrument
Derivative [Line Items]
Current derivative financial assets		0		0
Non-current derivative financial assets		82,931		111,026
Current derivative financial liabilities		0		0
Non-current derivative financial liabilities		93,245		13,250
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)		(108,090)		172,087	21,702
Net income effects of transaction gain (loss)		16,661		52,842	51,533
Accumulated other comprehensive income (loss)		0	[1]	0	0
Currency swap | Designated as Hedging Instrument
Derivative [Line Items]
Current derivative financial assets		11,193		27,597
Non-current derivative financial assets		44,455		118,232
Current derivative financial liabilities		36,088		59,327
Non-current derivative financial liabilities		139,424		31,934
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)		(298,517)		138,645	123,386
Net income effects of transaction gain (loss)		76,896		57,971	72,137
Accumulated other comprehensive income (loss)		105,642	[1]	38,802	(12,516)
Interest rate swap
Derivative [Line Items]
Current derivative financial assets		0		0
Non-current derivative financial assets		9,502		7,592
Current derivative financial liabilities		3,782		451
Non-current derivative financial liabilities		66,451		50,756
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)		(1,845)		(16,231)	(2,949)
Net income effects of transaction gain (loss)		(10,253)		(36,886)	(364)
Accumulated other comprehensive income (loss)		5,578	[1]	(3,075)	6,087
Interest rate swap | Not Designated as Hedging Instrument
Derivative [Line Items]
Current derivative financial assets		0		0
Non-current derivative financial assets		9,502		7,592
Current derivative financial liabilities		2,192		0
Non-current derivative financial liabilities		22,687		26,610
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)		(309)		(15,647)	(2,949)
Net income effects of transaction gain (loss)		(11,975)		(2,495)	(364)
Accumulated other comprehensive income (loss)		0	[1]	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		1,590		451
Non-current derivative financial liabilities		43,764		24,146
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)		(1,536)		(584)	0
Net income effects of transaction gain (loss)		1,722		(34,391)	0
Accumulated other comprehensive income (loss)		5,578	[1]	(3,075)	6,087
Others | Not Designated as Hedging Instrument
Derivative [Line Items]
Current derivative financial assets		0		0
Non-current derivative financial assets		0		2,634
Current derivative financial liabilities	[2],[3],[4]	0		6,205
Non-current derivative financial liabilities	[2],[3],[4]	11,138		956
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)		(6,673)		(1,416)	(1,568)
Net income effects of transaction gain (loss)		0		0	0
Accumulated other comprehensive income (loss)		₩ 0	[1]	₩ 0	₩ 0
[1]	For the year ended December 31, 2020, the net gain on valuation of derivatives designated as cash flow hedge of KRW64,561 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 Currency swap forwar

Derivative Currency swap forward contract List (Details) - 12 months ended Dec. 31, 2020 - Currency forward contracts $ in Thousands, ₩ in Millions	KRW (₩)	USD ($)
Disclosure of Derivative Currency forward contract detail list [Line Items]
Derivative Counterparty	Hana Bank	Hana Bank
Contract date	Apr. 10, 2014	Apr. 10, 2014
Matrurity date	Jul. 12, 2021	Jul. 12, 2021
Contract Amount Pay | ₩	₩ 55,120
Contract Amount Receive | $		$ 52,000
Contract exchange rate	1,060	1,060
Derivative Counterparty	Hana Bank	Hana Bank
Contract date	Apr. 28, 2014	Apr. 28, 2014
Matrurity date	Jul. 12, 2021	Jul. 12, 2021
Contract Amount Pay | ₩	₩ 50,784
Contract Amount Receive | $		$ 48,000
Contract exchange rate	1,058	1,058
Derivative Counterparty	Bank of America	Bank of America
Contract date	Apr. 29, 2014	Apr. 29, 2014
Matrurity date	Jul. 12, 2021	Jul. 12, 2021
Contract Amount Pay | ₩	₩ 105,400
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,054	1,054
Derivative Counterparty	Hana Bank	Hana Bank
Contract date	May 9, 2014	May 9, 2014
Matrurity date	Jul. 12, 2021	Jul. 12, 2021
Contract Amount Pay | ₩	₩ 104,600
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,046	1,046
Derivative Counterparty	Hana Bank	Hana Bank
Contract date	Dec. 22, 2017	Dec. 22, 2017
Matrurity date	Jul. 12, 2021	Jul. 12, 2021
Contract Amount Pay | ₩	₩ 105,079
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,050.79	1,050.79
Derivative Counterparty	Korea Development Bank	Korea Development Bank
Contract date	Dec. 27, 2017	Dec. 27, 2017
Matrurity date	Jul. 12, 2021	Jul. 12, 2021
Contract Amount Pay | ₩	₩ 104,849
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,048.49	1,048.49
Derivative Counterparty	Shinhan Bank	Shinhan Bank
Contract date	Nov. 25, 2020	Nov. 25, 2020
Matrurity date	Jan. 29, 2021	Jan. 29, 2021
Contract Amount Pay | ₩	₩ 895
Contract Amount Receive | $		$ 809
Contract exchange rate	1,106.5	1,106.5
Derivative Counterparty	Woori Bank	Woori Bank
Contract date	Dec. 28, 2020	Dec. 28, 2020
Matrurity date	Jan. 28, 2020	Jan. 28, 2020
Contract Amount Pay | ₩	₩ 53,371
Contract Amount Receive | $		$ 48,790
Contract exchange rate	1,093.88	1,093.88
Derivative Counterparty	Shinhan Bank	Shinhan Bank
Contract date	Dec. 29, 2020	Dec. 29, 2020
Matrurity date	Jan. 25, 2021	Jan. 25, 2021
Contract Amount Pay | ₩	₩ 27,776
Contract Amount Receive | $		$ 25,379
Contract exchange rate	1,094.44	1,094.44
Derivative Counterparty	Shinhan Bank	Shinhan Bank
Contract date	Oct. 8, 2020	Oct. 8, 2020
Matrurity date	Jan. 4, 2021	Jan. 4, 2021
Contract Amount Pay | ₩	₩ 7,836
Contract Amount Receive | $		$ 6,771
Contract exchange rate	1,157.15	1,157.15
Derivative Counterparty	Shinhan Bank	Shinhan Bank
Contract date	Oct. 8, 2020	Oct. 8, 2020
Matrurity date	Jan. 5, 2021	Jan. 5, 2021
Contract Amount Pay | ₩	₩ 7,586
Contract Amount Receive | $		$ 6,552
Contract exchange rate	1,157.75	1,157.75
Derivative Counterparty	Shinhan Bank	Shinhan Bank
Contract date	Oct. 19, 2020	Oct. 19, 2020
Matrurity date	Jan. 18, 2021	Jan. 18, 2021
Contract Amount Pay | ₩	₩ 10,498
Contract Amount Receive | $		$ 9,188
Contract exchange rate	1,142.68	1,142.68
Derivative Counterparty	Shinhan Bank	Shinhan Bank
Contract date	Oct. 21, 2020	Oct. 21, 2020
Matrurity date	Jan. 19, 2021	Jan. 19, 2021
Contract Amount Pay | ₩	₩ 7,633
Contract Amount Receive | $		$ 6,717
Contract exchange rate	1,136.45	1,136.45
Derivative Counterparty	Shinhan Bank	Shinhan Bank
Contract date	Nov. 5, 2020	Nov. 5, 2020
Matrurity date	Feb. 2, 2021	Feb. 2, 2021
Contract Amount Pay | ₩	₩ 6,471
Contract Amount Receive | $		$ 5,729
Contract exchange rate	1,129.45	1,129.45
Derivative Counterparty	CCB	CCB
Contract date	Nov. 30, 2020	Nov. 30, 2020
Matrurity date	Jan. 5, 2021	Jan. 5, 2021
Contract Amount Pay | ₩	₩ 5,522
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,104.45	1,104.45
Derivative Counterparty	Standard Chartered	Standard Chartered
Contract date	Dec. 9, 2020	Dec. 9, 2020
Matrurity date	Jan. 14, 2021	Jan. 14, 2021
Contract Amount Pay | ₩	₩ 3,248
Contract Amount Receive | $		$ 3,000
Contract exchange rate	1,082.8	1,082.8
Derivative Counterparty	Mizuho Bank	Mizuho Bank
Contract date	Dec. 14, 2020	Dec. 14, 2020
Matrurity date	Jan. 20, 2021	Jan. 20, 2021
Contract Amount Pay | ₩	₩ 2,180
Contract Amount Receive | $		$ 2,000
Contract exchange rate	1,090.05	1,090.05
Derivative Counterparty	Hana Bank	Hana Bank
Contract date	Dec. 17, 2020	Dec. 17, 2020
Matrurity date	Jan. 25, 2021	Jan. 25, 2021
Contract Amount Pay | ₩	₩ 5,456
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,091.25	1,091.25
Derivative Counterparty	Korea Development Bank	Korea Development Bank
Contract date	Dec. 18, 2020	Dec. 18, 2020
Matrurity date	Jan. 28, 2021	Jan. 28, 2021
Contract Amount Pay | ₩	₩ 5,469
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,093.75	1,093.75
Derivative Counterparty	Woori Bank	Woori Bank
Contract date	Dec. 23, 2020	Dec. 23, 2020
Matrurity date	Feb. 2, 2021	Feb. 2, 2021
Contract Amount Pay | ₩	₩ 5,540
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,107.95	1,107.95
Derivative Counterparty	Hana Bank	Hana Bank
Contract date	Dec. 24, 2020	Dec. 24, 2020
Matrurity date	Feb. 8, 2021	Feb. 8, 2021
Contract Amount Pay | ₩	₩ 3,303
Contract Amount Receive | $		$ 3,000
Contract exchange rate	1,101.1	1,101.1
Derivative Counterparty	Morgan Stanley	Morgan Stanley
Contract date	Dec. 24, 2020	Dec. 24, 2020
Matrurity date	Feb. 9, 2021	Feb. 9, 2021
Contract Amount Pay | ₩	₩ 5,504
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,100.8	1,100.8
Derivative Counterparty	Standard Chartered	Standard Chartered
Contract date	Dec. 28, 2020	Dec. 28, 2020
Matrurity date	Feb. 10, 2021	Feb. 10, 2021
Contract Amount Pay | ₩	₩ 3,296
Contract Amount Receive | $		$ 3,000
Contract exchange rate	1,098.5	1,098.5
Derivative Counterparty	Credit Agricole	Credit Agricole
Contract date	Dec. 28, 2020	Dec. 28, 2020
Matrurity date	Feb. 15, 2021	Feb. 15, 2021
Contract Amount Pay | ₩	₩ 3,284
Contract Amount Receive | $		$ 3,000
Contract exchange rate	1,094.55	1,094.55
Derivative Counterparty	Nonghyup Bank	Nonghyup Bank
Contract date	Dec. 29, 2020	Dec. 29, 2020
Matrurity date	Feb. 17, 2021	Feb. 17, 2021
Contract Amount Pay | ₩	₩ 6,572
Contract Amount Receive | $		$ 6,000
Contract exchange rate	1,095.3	1,095.3
Derivative Counterparty	Korea Development Bank	Korea Development Bank
Contract date	Dec. 30, 2020	Dec. 30, 2020
Matrurity date	Feb. 19, 2021	Feb. 19, 2021
Contract Amount Pay | ₩	₩ 5,436
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,087.16	1,087.16
Derivative Counterparty	Korea Development Bank	Korea Development Bank
Contract date	Dec. 15, 2020	Dec. 15, 2020
Matrurity date	Jan. 5, 2021	Jan. 5, 2021
Contract Amount Pay | ₩	₩ 1,092
Contract Amount Receive | $		$ 1,000
Contract exchange rate	1,092.1	1,092.1
Derivative Counterparty	HSBC	HSBC
Contract date	Dec. 23, 2020	Dec. 23, 2020
Matrurity date	Jan. 5, 2021	Jan. 5, 2021
Contract Amount Pay | ₩	₩ 3,881
Contract Amount Receive | $		$ 3,500
Contract exchange rate	1,108.85	1,108.85
Derivative Counterparty	HSBC	HSBC
Contract date	Dec. 24, 2020	Dec. 24, 2020
Matrurity date	Jan. 5, 2021	Jan. 5, 2021
Contract Amount Pay | ₩	₩ 3,306
Contract Amount Receive | $		$ 3,000
Contract exchange rate	1,101.95	1,101.95
Derivative Counterparty	HSBC	HSBC
Contract date	Dec. 24, 2020	Dec. 24, 2020
Matrurity date	Jan. 22, 2021	Jan. 22, 2021
Contract Amount Pay | ₩	₩ 1,651
Contract Amount Receive | $		$ 1,500
Contract exchange rate	1,100.8	1,100.8
Derivative Counterparty	HSBC	HSBC
Contract date	Dec. 29, 2020	Dec. 29, 2020
Matrurity date	Jan. 13, 2021	Jan. 13, 2021
Contract Amount Pay | ₩	₩ 14,210
Contract Amount Receive | $		$ 13,000
Contract exchange rate	1,093.1	1,093.1
Derivative Counterparty	Korea Development Bank	Korea Development Bank
Contract date	Dec. 29, 2020	Dec. 29, 2020
Matrurity date	Jan. 5, 2021	Jan. 5, 2021
Contract Amount Pay | ₩	₩ 6,791
Contract Amount Receive | $		$ 6,200
Contract exchange rate	1,095.35	1,095.35
Derivative Counterparty	Shinhan Bank	Shinhan Bank
Contract date	Dec. 30, 2020	Dec. 30, 2020
Matrurity date	Jan. 22, 2021	Jan. 22, 2021
Contract Amount Pay | ₩	₩ 9,249
Contract Amount Receive | $		$ 8,500
Contract exchange rate	1,088.1	1,088.1
Derivative Counterparty	MUFG	MUFG
Contract date	Dec. 29, 2020	Dec. 29, 2020
Matrurity date	Jan. 12, 2021	Jan. 12, 2021
Contract Amount Pay | ₩	₩ 4,380
Contract Amount Receive | $		$ 4,000
Contract exchange rate	1,095.05	1,095.05
Derivative Counterparty	BNP Paribas	BNP Paribas
Contract date	Dec. 30, 2020	Dec. 30, 2020
Matrurity date	Jan. 19, 2021	Jan. 19, 2021
Contract Amount Pay | ₩	₩ 4,351
Contract Amount Receive | $		$ 4,000
Contract exchange rate	1,087.8	1,087.8
Derivative Counterparty	Nova Scotia	Nova Scotia
Contract date	Sep. 18, 2020	Sep. 18, 2020
Matrurity date	Jan. 12, 2021	Jan. 12, 2021
Contract Amount Pay | ₩	₩ 46,700
Contract Amount Receive | $		$ 40,000
Contract exchange rate	1,167.45	1,167.45
Derivative Counterparty	Mizuho Bank	Mizuho Bank
Contract date	Sep. 18, 2020	Sep. 18, 2020
Matrurity date	Mar. 11, 2021	Mar. 11, 2021
Contract Amount Pay | ₩	₩ 15,177
Contract Amount Receive | $		$ 13,000
Contract exchange rate	1,167.45	1,167.45
Derivative Counterparty	HSBC	HSBC
Contract date	Sep. 18, 2020	Sep. 18, 2020
Matrurity date	Jun. 11, 2021	Jun. 11, 2021
Contract Amount Pay | ₩	₩ 31,506
Contract Amount Receive | $		$ 27,000
Contract exchange rate	1,166.9	1,166.9
Derivative Counterparty	HSBC	HSBC
Contract date	Oct. 19, 2020	Oct. 19, 2020
Matrurity date	Oct. 29, 2024	Oct. 29, 2024
Contract Amount Pay | ₩	₩ 140,913
Contract Amount Receive | $		$ 125,000
Contract exchange rate	1,127.3	1,127.3
Derivative Counterparty	Woori Bank	Woori Bank
Contract date	Dec. 3, 2020	Dec. 3, 2020
Matrurity date	Jan. 8, 2021	Jan. 8, 2021
Contract Amount Pay | ₩	₩ 1,461
Contract Amount Receive | $		$ 1,330
Contract exchange rate	1,098.7	1,098.7
Derivative Counterparty	Shinhan Bank	Shinhan Bank
Contract date	Dec. 4, 2020	Dec. 4, 2020
Matrurity date	Jan. 8, 2021	Jan. 8, 2021
Contract Amount Pay | ₩	₩ 9,775
Contract Amount Receive | $		$ 9,000
Contract exchange rate	1,086.15	1,086.15
Derivative Counterparty	Credit Agricole	Credit Agricole
Contract date	Dec. 10, 2020	Dec. 10, 2020
Matrurity date	Jan. 8, 2021	Jan. 8, 2021
Contract Amount Pay | ₩	₩ 3,915
Contract Amount Receive | $		$ 3,600
Contract exchange rate	1,087.45	1,087.45
Derivative Counterparty	Standard Chartered	Standard Chartered
Contract date	Dec. 17, 2020	Dec. 17, 2020
Matrurity date	Jan. 15, 2021	Jan. 15, 2021
Contract Amount Pay | ₩	₩ 4,044
Contract Amount Receive | $		$ 3,700
Contract exchange rate	1,093.1	1,093.1
Derivative Counterparty	Hana Bank	Hana Bank
Contract date	Dec. 23, 2020	Dec. 23, 2020
Matrurity date	Jan. 21, 2021	Jan. 21, 2021
Contract Amount Pay | ₩	₩ 3,321
Contract Amount Receive | $		$ 3,000
Contract exchange rate	1,107.15	1,107.15
Derivative Counterparty	Hana Bank	Hana Bank
Contract date	Dec. 24, 2020	Dec. 24, 2020
Matrurity date	Jan. 21, 2021	Jan. 21, 2021
Contract Amount Pay | ₩	₩ 5,504
Contract Amount Receive | $		$ 5,000
Contract exchange rate	1,100.7	1,100.7
Derivative Counterparty	Woori Bank	Woori Bank
Contract date	Dec. 28, 2020	Dec. 28, 2020
Matrurity date	Jan. 4, 2021	Jan. 4, 2021
Contract Amount Pay | ₩	₩ 19,076
Contract Amount Receive | $		$ 17,400
Contract exchange rate	1,096.3	1,096.3
Derivative Counterparty	Standard Chartered	Standard Chartered
Contract date	Dec. 28, 2020	Dec. 28, 2020
Matrurity date	Jan. 15, 2021	Jan. 15, 2021
Contract Amount Pay | ₩	₩ 6,577
Contract Amount Receive | $		$ 6,000
Contract exchange rate	1,096.2	1,096.2
Derivative Counterparty	Shinhan Bank	Shinhan Bank
Contract date	Dec. 28, 2020	Dec. 28, 2020
Matrurity date	Jan. 29, 2021	Jan. 29, 2021
Contract Amount Pay | ₩	₩ 9,870
Contract Amount Receive | $		$ 9,000
Contract exchange rate	1,096.7	1,096.7
Derivative Counterparty	Credit Agricole	Credit Agricole
Contract date	Dec. 30, 2020	Dec. 30, 2020
Matrurity date	Jan. 29, 2021	Jan. 29, 2021
Contract Amount Pay | ₩	₩ 4,915
Contract Amount Receive | $		$ 4,500
Contract exchange rate	1,092.3	1,092.3
Derivative Counterparty	Standard Chartered	Standard Chartered
Contract date	Dec. 30, 2020	Dec. 30, 2020
Matrurity date	Jan. 29, 2021	Jan. 29, 2021
Contract Amount Pay | ₩	₩ 4,344
Contract Amount Receive | $		$ 4,000
Contract exchange rate	1,086	1,086
Derivative Counterparty	Woori Bank	Woori Bank
Contract date	Dec. 30, 2020	Dec. 30, 2020
Matrurity date	Feb. 5, 2021	Feb. 5, 2021
Contract Amount Pay | ₩	₩ 8,691
Contract Amount Receive | $		$ 8,000
Contract exchange rate	1,086.4	1,086.4

Derivative Currency swap contra

Derivative Currency swap contract List (Details) - 12 months ended Dec. 31, 2020 - 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
Contract Amount Pay	₩ 102,470
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,024.7	1,024.7	1,024.7	1,024.7	1,024.7	1,024.7	1,024.7
Derivative, Term of Contract	2014~2029	2014~2029	2014~2029	2014~2029	2014~2029	2014~2029	2014~2029
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%
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
Contract Amount Pay	₩ 105,017
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,050.17	1,050.17	1,050.17	1,050.17	1,050.17	1,050.17	1,050.17
Derivative, Term of Contract	2014~2024	2014~2024	2014~2024	2014~2024	2014~2024	2014~2024	2014~2024
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%
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
Contract Amount Pay	₩ 107,970
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,079.7	1,079.7	1,079.7	1,079.7	1,079.7	1,079.7	1,079.7
Derivative, Term of Contract	2015~2024	2015~2024	2015~2024	2015~2024	2015~2024	2015~2024	2015~2024
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%
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
Contract Amount Pay	₩ 94,219
Contract Amount Receive | $		$ 86,920
Contract exchange rate	1,083.97	1,083.97	1,083.97	1,083.97	1,083.97	1,083.97	1,083.97
Derivative, Term of Contract	2015~2024	2015~2024	2015~2024	2015~2024	2015~2024	2015~2024	2015~2024
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%
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
Contract Amount Pay	₩ 21,708
Contract Amount Receive | $		$ 19,417
Contract exchange rate	1,118	1,118	1,118	1,118	1,118	1,118	1,118
Derivative, Term of Contract	2019~2027	2019~2027	2019~2027	2019~2027	2019~2027	2019~2027	2019~2027
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%
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
Contract Amount Pay	₩ 296,000
Contract Amount Receive | $		$ 250,000
Contract exchange rate	1,184	1,184	1,184	1,184	1,184	1,184	1,184
Derivative, Term of Contract	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024
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%
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
Contract Amount Pay	₩ 177,600
Contract Amount Receive | $		$ 150,000
Contract exchange rate	1,184	1,184	1,184	1,184	1,184	1,184	1,184
Derivative, Term of Contract	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024
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%
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
Contract Amount Pay	₩ 118,400
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,184	1,184	1,184	1,184	1,184	1,184	1,184
Derivative, Term of Contract	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024
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%
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
Contract Amount Pay	₩ 241,320
Contract Amount Receive | $		$ 200,000
Contract exchange rate	1,206.6	1,206.6	1,206.6	1,206.6	1,206.6	1,206.6	1,206.6
Derivative, Term of Contract	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025
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%
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
Contract Amount Pay	₩ 241,320
Contract Amount Receive | $		$ 200,000
Contract exchange rate	1,206.6	1,206.6	1,206.6	1,206.6	1,206.6	1,206.6	1,206.6
Derivative, Term of Contract	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025
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%
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
Contract Amount Pay	₩ 120,660
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,206.6	1,206.6	1,206.6	1,206.6	1,206.6	1,206.6	1,206.6
Derivative, Term of Contract	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025
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%
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
Contract Amount Pay	₩ 76,355
Contract Amount Receive | $		$ 70,445
Contract exchange rate	1,083.9	1,083.9	1,083.9	1,083.9	1,083.9	1,083.9	1,083.9
Derivative, Term of Contract	2020~2026	2020~2026	2020~2026	2020~2026	2020~2026	2020~2026	2020~2026
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%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Citibank	Citibank	Citibank	Citibank	Citibank	Citibank	Citibank
Contract Amount Pay	₩ 112,930
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,129.3	1,129.3	1,129.3	1,129.3	1,129.3	1,129.3	1,129.3
Derivative, Term of Contract	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022
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%
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
Contract Amount Pay	₩ 112,930
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,129.3	1,129.3	1,129.3	1,129.3	1,129.3	1,129.3	1,129.3
Derivative, Term of Contract	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022
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%
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
Contract Amount Pay	₩ 112,930
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,129.3	1,129.3	1,129.3	1,129.3	1,129.3	1,129.3	1,129.3
Derivative, Term of Contract	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022
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%
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
Contract Amount Pay	₩ 112,930
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,129.3	1,129.3	1,129.3	1,129.3	1,129.3	1,129.3	1,129.3
Derivative, Term of Contract	2016~2022	2016~2022	2016~2022	2016~2022	2016~2022	2016~2022	2016~2022
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%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	HSBC	HSBC	HSBC	HSBC	HSBC	HSBC	HSBC
Contract Amount Pay	₩ 111,770
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,117.7	1,117.7	1,117.7	1,117.7	1,117.7	1,117.7	1,117.7
Derivative, Term of Contract	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022
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%
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
Contract Amount Pay	₩ 111,770
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,117.7	1,117.7	1,117.7	1,117.7	1,117.7	1,117.7	1,117.7
Derivative, Term of Contract	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022
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%
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
Contract Amount Pay	₩ 111,770
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,117.7	1,117.7	1,117.7	1,117.7	1,117.7	1,117.7	1,117.7
Derivative, Term of Contract	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022
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%
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
Contract Amount Pay	₩ 55,885
Contract Amount Receive | $		$ 50,000
Contract exchange rate	1,117.7	1,117.7	1,117.7	1,117.7	1,117.7	1,117.7	1,117.7
Derivative, Term of Contract	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022	2012~2022
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%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Nomura	Nomura	Nomura	Nomura	Nomura	Nomura	Nomura
Contract Amount Pay	₩ 111,190
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,111.9	1,111.9	1,111.9	1,111.9	1,111.9	1,111.9	1,111.9
Derivative, Term of Contract	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025
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%
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
Contract Amount Pay	₩ 111,190
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,111.9	1,111.9	1,111.9	1,111.9	1,111.9	1,111.9	1,111.9
Derivative, Term of Contract	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025
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%
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
Contract Amount Pay	₩ 55,595
Contract Amount Receive | $		$ 50,000
Contract exchange rate	1,111.9	1,111.9	1,111.9	1,111.9	1,111.9	1,111.9	1,111.9
Derivative, Term of Contract	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025
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%
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
Contract Amount Pay	₩ 55,595
Contract Amount Receive | $		$ 50,000
Contract exchange rate	1,111.9	1,111.9	1,111.9	1,111.9	1,111.9	1,111.9	1,111.9
Derivative, Term of Contract	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025	2015~2025
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%
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
Contract Amount Pay	₩ 111,610
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,116.1	1,116.1	1,116.1	1,116.1	1,116.1	1,116.1	1,116.1
Derivative, Term of Contract	2017~2027	2017~2027	2017~2027	2017~2027	2017~2027	2017~2027	2017~2027
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%
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
Contract Amount Pay	₩ 111,610
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,116.1	1,116.1	1,116.1	1,116.1	1,116.1	1,116.1	1,116.1
Derivative, Term of Contract	2017~2027	2017~2027	2017~2027	2017~2027	2017~2027	2017~2027	2017~2027
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%
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
Contract Amount Pay	₩ 111,610
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,116.1	1,116.1	1,116.1	1,116.1	1,116.1	1,116.1	1,116.1
Derivative, Term of Contract	2017~2027	2017~2027	2017~2027	2017~2027	2017~2027	2017~2027	2017~2027
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%
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
Contract Amount Pay	₩ 108,600
Contract Amount Receive | $			$ 800,000
Contract exchange rate	135.75	135.75	135.75	135.75	135.75	135.75	135.75
Derivative, Term of Contract	2018~2028	2018~2028	2018~2028	2018~2028	2018~2028	2018~2028	2018~2028
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%
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
Contract Amount Pay	₩ 115,387
Contract Amount Receive | $			$ 850,000
Contract exchange rate	135.75	135.75	135.75	135.75	135.75	135.75	135.75
Derivative, Term of Contract	2018~2028	2018~2028	2018~2028	2018~2028	2018~2028	2018~2028	2018~2028
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%
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
Contract Amount Pay	₩ 170,280
Contract Amount Receive | $		$ 150,000
Contract exchange rate	1,135.2	1,135.2	1,135.2	1,135.2	1,135.2	1,135.2	1,135.2
Derivative, Term of Contract	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023
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%
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
Contract Amount Pay	₩ 170,280
Contract Amount Receive | $		$ 150,000
Contract exchange rate	1,135.2	1,135.2	1,135.2	1,135.2	1,135.2	1,135.2	1,135.2
Derivative, Term of Contract	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023
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%
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
Contract Amount Pay	₩ 113,520
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,135.2	1,135.2	1,135.2	1,135.2	1,135.2	1,135.2	1,135.2
Derivative, Term of Contract	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023
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%
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
Contract Amount Pay	₩ 227,040
Contract Amount Receive | $		$ 200,000
Contract exchange rate	1,135.2	1,135.2	1,135.2	1,135.2	1,135.2	1,135.2	1,135.2
Derivative, Term of Contract	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023
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%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Citibank	Citibank	Citibank	Citibank	Citibank	Citibank	Citibank
Contract Amount Pay	₩ 239,956
Contract Amount Receive | SFr				SFr 200,000
Contract exchange rate	1,199.78	1,199.78	1,199.78	1,199.78	1,199.78	1,199.78	1,199.78
Derivative, Term of Contract	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024
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%
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
Contract Amount Pay	₩ 119,978
Contract Amount Receive | SFr				SFr 100,000
Contract exchange rate	1,199.78	1,199.78	1,199.78	1,199.78	1,199.78	1,199.78	1,199.78
Derivative, Term of Contract	2019~2027	2019~2027	2019~2027	2019~2027	2019~2027	2019~2027	2019~2027
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%
Not Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	HSBC	HSBC	HSBC	HSBC	HSBC	HSBC	HSBC
Contract Amount Pay | $		$ 205,500
Contract Amount Receive | $					$ 300,000
Contract exchange rate	0.69	0.69	0.69	0.69	0.69	0.69	0.69
Derivative, Term of Contract	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024
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%
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
Contract Amount Pay	₩ 118,780
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,187.80	1,187.80	1,187.80	1,187.80	1,187.80	1,187.80	1,187.80
Derivative, Term of Contract	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025
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%
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
Contract Amount Pay	₩ 118,780
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,187.80	1,187.80	1,187.80	1,187.80	1,187.80	1,187.80	1,187.80
Derivative, Term of Contract	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025
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%
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
Contract Amount Pay	₩ 118,780
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,187.80	1,187.80	1,187.80	1,187.80	1,187.80	1,187.80	1,187.80
Derivative, Term of Contract	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025
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%
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
Contract Amount Pay	₩ 118,910
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,189.10	1,189.10	1,189.10	1,189.10	1,189.10	1,189.10	1,189.10
Derivative, Term of Contract	2020~2026	2020~2026	2020~2026	2020~2026	2020~2026	2020~2026	2020~2026
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%
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
Contract Amount Pay	₩ 118,910
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,189.10	1,189.10	1,189.10	1,189.10	1,189.10	1,189.10	1,189.10
Derivative, Term of Contract	2020~2026	2020~2026	2020~2026	2020~2026	2020~2026	2020~2026	2020~2026
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%
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
Contract Amount Pay	₩ 118,910
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,189.10	1,189.10	1,189.10	1,189.10	1,189.10	1,189.10	1,189.10
Derivative, Term of Contract	2020~2026	2020~2026	2020~2026	2020~2026	2020~2026	2020~2026	2020~2026
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%
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
Contract Amount Pay	₩ 121,000
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,210	1,210	1,210	1,210	1,210	1,210	1,210
Derivative, Term of Contract	2016~2021	2016~2021	2016~2021	2016~2021	2016~2021	2016~2021	2016~2021
Contract Interest rate Pay	2.15%	2.15%	2.15%	2.15%	2.15%	2.15%	2.15%
Contract Interest rate Receive	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Morgan Stanley	Morgan Stanley	Morgan Stanley	Morgan Stanley	Morgan Stanley	Morgan Stanley	Morgan Stanley
Contract Amount Pay	₩ 121,000
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,210	1,210	1,210	1,210	1,210	1,210	1,210
Derivative, Term of Contract	2016~2021	2016~2021	2016~2021	2016~2021	2016~2021	2016~2021	2016~2021
Contract Interest rate Pay	3M Libor + 2.10%	3M Libor + 2.10%	3M Libor + 2.10%	3M Libor + 2.10%	3M Libor + 2.10%	3M Libor + 2.10%	3M Libor + 2.10%
Contract Interest rate Receive	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
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
Contract Amount Pay	₩ 121,000
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,210	1,210	1,210	1,210	1,210	1,210	1,210
Derivative, Term of Contract	2016~2021	2016~2021	2016~2021	2016~2021	2016~2021	2016~2021	2016~2021
Contract Interest rate Pay	3M Libor + 2.10%	3M Libor + 2.10%	3M Libor + 2.10%	3M Libor + 2.10%	3M Libor + 2.10%	3M Libor + 2.10%	3M Libor + 2.10%
Contract Interest rate Receive	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Nomura	Nomura	Nomura	Nomura	Nomura	Nomura	Nomura
Contract Amount Pay	₩ 52,457
Contract Amount Receive | €						€ 40,000
Contract exchange rate	1,311.42	1,311.42	1,311.42	1,311.42	1,311.42	1,311.42	1,311.42
Derivative, Term of Contract	2017~2037	2017~2037	2017~2037	2017~2037	2017~2037	2017~2037	2017~2037
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%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Nomura	Nomura	Nomura	Nomura	Nomura	Nomura	Nomura
Contract Amount Pay	₩ 59,423
Contract Amount Receive | kr							kr 450,000
Contract exchange rate	132.05	132.05	132.05	132.05	132.05	132.05	132.05
Derivative, Term of Contract	2017~2037	2017~2037	2017~2037	2017~2037	2017~2037	2017~2037	2017~2037
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%
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
Contract Amount Pay	₩ 112,650
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,126.50	1,126.50	1,126.50	1,126.50	1,126.50	1,126.50	1,126.50
Derivative, Term of Contract	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022
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%
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
Contract Amount Pay	₩ 112,650
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,126.50	1,126.50	1,126.50	1,126.50	1,126.50	1,126.50	1,126.50
Derivative, Term of Contract	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022
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%
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
Contract Amount Pay	₩ 112,650
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,126.50	1,126.50	1,126.50	1,126.50	1,126.50	1,126.50	1,126.50
Derivative, Term of Contract	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022
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%
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
Contract Amount Pay	₩ 320,880
Contract Amount Receive | $		$ 300,000
Contract exchange rate	1,069.60	1,069.60	1,069.60	1,069.60	1,069.60	1,069.60	1,069.60
Derivative, Term of Contract	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023
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%
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
Contract Amount Pay	₩ 111,841
Contract Amount Receive | SFr				SFr 100,000
Contract exchange rate	1,118.41	1,118.41	1,118.41	1,118.41	1,118.41	1,118.41	1,118.41
Derivative, Term of Contract	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024
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%
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
Contract Amount Pay	₩ 111,841
Contract Amount Receive | SFr				SFr 100,000
Contract exchange rate	1,118.41	1,118.41	1,118.41	1,118.41	1,118.41	1,118.41	1,118.41
Derivative, Term of Contract	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024	2019~2024
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%
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
Contract Amount Pay	₩ 117,340
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,173.40	1,173.40	1,173.40	1,173.40	1,173.40	1,173.40	1,173.40
Derivative, Term of Contract	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022
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%
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
Contract Amount Pay	₩ 117,340
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,173.40	1,173.40	1,173.40	1,173.40	1,173.40	1,173.40	1,173.40
Derivative, Term of Contract	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022
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%
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
Contract Amount Pay	₩ 117,340
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,173.40	1,173.40	1,173.40	1,173.40	1,173.40	1,173.40	1,173.40
Derivative, Term of Contract	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022	2019~2022
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%
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
Contract Amount Pay	₩ 212,960
Contract Amount Receive | $		$ 200,000
Contract exchange rate	1,064.80	1,064.80	1,064.80	1,064.80	1,064.80	1,064.80	1,064.80
Derivative, Term of Contract	2018~2021	2018~2021	2018~2021	2018~2021	2018~2021	2018~2021	2018~2021
Contract Interest rate Pay	2.10%	2.10%	2.10%	2.10%	2.10%	2.10%	2.10%
Contract Interest rate Receive	3.00%	3.00%	3.00%	3.00%	3.00%	3.00%	3.00%
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
Contract Amount Pay	₩ 212,960
Contract Amount Receive | $		$ 200,000
Contract exchange rate	1,064.80	1,064.80	1,064.80	1,064.80	1,064.80	1,064.80	1,064.80
Derivative, Term of Contract	2018~2021	2018~2021	2018~2021	2018~2021	2018~2021	2018~2021	2018~2021
Contract Interest rate Pay	2.10%	2.10%	2.10%	2.10%	2.10%	2.10%	2.10%
Contract Interest rate Receive	3.00%	3.00%	3.00%	3.00%	3.00%	3.00%	3.00%
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
Contract Amount Pay	₩ 226,600
Contract Amount Receive | $		$ 200,000
Contract exchange rate	1,133	1,133	1,133	1,133	1,133	1,133	1,133
Derivative, Term of Contract	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022
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%
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
Contract Amount Pay	₩ 113,300
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,133	1,133	1,133	1,133	1,133	1,133	1,133
Derivative, Term of Contract	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022
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%
Designated as Hedging Instrument
Disclosure of Derivative Currency swap contract detail list [Line Items]
Derivative Counterparty	Nomura	Nomura	Nomura	Nomura	Nomura	Nomura	Nomura
Contract Amount Pay	₩ 113,300
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,133	1,133	1,133	1,133	1,133	1,133	1,133
Derivative, Term of Contract	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022
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%
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
Contract Amount Pay	₩ 56,650
Contract Amount Receive | $		$ 50,000
Contract exchange rate	1,133	1,133	1,133	1,133	1,133	1,133	1,133
Derivative, Term of Contract	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022
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%
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
Contract Amount Pay	₩ 56,650
Contract Amount Receive | $		$ 50,000
Contract exchange rate	1,133	1,133	1,133	1,133	1,133	1,133	1,133
Derivative, Term of Contract	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022	2017~2022
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%
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
Contract Amount Pay	₩ 169,335
Contract Amount Receive | $		$ 150,000
Contract exchange rate	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90
Derivative, Term of Contract	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023
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%
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
Contract Amount Pay	₩ 169,335
Contract Amount Receive | $		$ 150,000
Contract exchange rate	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90
Derivative, Term of Contract	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023
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%
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
Contract Amount Pay	₩ 112,890
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90
Derivative, Term of Contract	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023
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%
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
Contract Amount Pay	₩ 56,445
Contract Amount Receive | $		$ 50,000
Contract exchange rate	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90
Derivative, Term of Contract	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023
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%
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
Contract Amount Pay	₩ 56,445
Contract Amount Receive | $		$ 50,000
Contract exchange rate	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90	1,128.90
Derivative, Term of Contract	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023	2018~2023
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%
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
Contract Amount Pay	₩ 245,560
Contract Amount Receive | $		$ 200,000
Contract exchange rate	1,227.80	1,227.80	1,227.80	1,227.80	1,227.80	1,227.80	1,227.80
Derivative, Term of Contract	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025
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%
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
Contract Amount Pay	₩ 245,560
Contract Amount Receive | $		$ 200,000
Contract exchange rate	1,227.80	1,227.80	1,227.80	1,227.80	1,227.80	1,227.80	1,227.80
Derivative, Term of Contract	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025
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%
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
Contract Amount Pay	₩ 122,780
Contract Amount Receive | $		$ 100,000
Contract exchange rate	1,227.80	1,227.80	1,227.80	1,227.80	1,227.80	1,227.80	1,227.80
Derivative, Term of Contract	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025	2020~2025
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%

Derivative Interest rate swap c

Derivative Interest rate swap contract List (Details) - 12 months ended Dec. 31, 2020 - Interest rate swap contracts $ in Thousands, ₩ in Millions		KRW (₩)	USD ($)
Not Designated as Hedging Instrument [Member]
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 [Member]
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 [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Hana Bank
Derivative, Term of Contract		2017~2021
Contract Interest rate Pay		2.45%
Contract Interest rate Receive		3M CD + 0.32%
Contract amount		₩ 200,000
Not Designated as Hedging Instrument [Member]
Disclosure of Derivative Interest rate swap contract detail list [Line Items]
Counterparty		Nomura
Derivative, Term of Contract		2018~2038
Contract Interest rate Pay	[1]	2.56%
Contract Interest rate Receive		3.75%
Contract amount		₩ 30,000
Not Designated as Hedging Instrument [Member]
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 [Member]
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 [Member]
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 [Member]
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 [Member]
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 [Member]
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 [Member]
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
Designated as Hedging Instrument [Member]
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 [Member]
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 [Member]
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 [Member]
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 | $			69,509
Designated as Hedging Instrument [Member]
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 | $			69,509
Designated as Hedging Instrument [Member]
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 | $			$ 75,929
[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.

Other-Financial Assets (Details

Other-Financial Assets (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Other Financial Assets [Line Items]
Current Other financial assets	₩ 1,561,445	₩ 1,415,204
Non-Current Other financial assets	1,290,820	1,283,730
Loans and receivables
Other Financial Assets [Line Items]
Current Other financial assets	77,963	63,233
Non-Current Other financial assets	712,199	675,474
Loans and receivables | Gross amount
Other Financial Assets [Line Items]
Current Other financial assets	78,806	64,111
Non-Current Other financial assets	762,555	725,755
Loans and receivables | Allowance for doubtful accounts
Other Financial Assets [Line Items]
Current Other financial assets	(1)	(31)
Non-Current Other financial assets	(20,266)	(15,063)
Loans and receivables | Present value discount
Other Financial Assets [Line Items]
Current Other financial assets	(842)	(847)
Non-Current Other financial assets	(30,090)	(35,218)
Short-term financial instruments
Other Financial Assets [Line Items]
Current Other financial assets	1,483,482	1,351,971
Long-term financial instruments
Other Financial Assets [Line Items]
Non-Current Other financial assets	₩ 578,621	₩ 608,256

Other-Financial Assets _ Loans

Other-Financial Assets : Loans and receivables (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]
Short-term loans and receivables Face value	₩ 78,806	₩ 64,111
Short-term loans and receivables Allowance for doubtful accounts	(1)	(31)
Short-term loans and receivables Present value discount	(842)	(847)
Short-term loans and receivables	77,963	63,233
Long-term loans and receivables Face value	762,555	725,755
Long-term loans and receivables Allowance for doubtful accounts	(20,266)	(15,063)
Long-term loans and receivables Present value discount	(30,090)	(35,218)
Long-term loans and receivables	712,199	675,474
Loans and receivables Face value	841,361	789,866
Loans and receivables Allowance for doubtful accounts	(20,267)	(15,094)
Loans and receivables Present value discount	(30,932)	(36,065)
Loans and receivables	790,162	738,707
Loans for tuition
Loans and Leases Receivable Disclosure [Line Items]
Short-term loans and receivables Face value	33,864	33,636
Short-term loans and receivables Allowance for doubtful accounts	0	0
Short-term loans and receivables Present value discount	(842)	(847)
Short-term loans and receivables	33,022	32,789
Long-term loans and receivables Face value	420,274	419,905
Long-term loans and receivables Allowance for doubtful accounts	(9,091)	0
Long-term loans and receivables Present value discount	(30,090)	(35,197)
Long-term loans and receivables	381,093	384,708
Loans for housing
Loans and Leases Receivable Disclosure [Line Items]
Short-term loans and receivables Face value	21,988	17,113
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	21,988	17,113
Long-term loans and receivables Face value	237,100	199,454
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	237,100	199,454
Loans for related parties
Loans and Leases Receivable Disclosure [Line Items]
Short-term loans and receivables Face value	0	0
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	0	0
Long-term loans and receivables Face value	50,682	89,132
Long-term loans and receivables Allowance for doubtful accounts	(1,047)	(4,930)
Long-term loans and receivables Present value discount	0	0
Long-term loans and receivables	49,635	84,202
Fisheries loan
Loans and Leases Receivable Disclosure [Line Items]
Short-term loans and receivables Face value	3,816	0
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	3,816	0
Long-term loans and receivables Face value	0	0
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		0
Other loans
Loans and Leases Receivable Disclosure [Line Items]
Short-term loans and receivables Face value	19,138	13,362
Short-term loans and receivables Allowance for doubtful accounts	(1)	(31)
Short-term loans and receivables Present value discount	0	0
Short-term loans and receivables	19,137	13,331
Long-term loans and receivables Face value	54,499	17,264
Long-term loans and receivables Allowance for doubtful accounts	(10,128)	(10,133)
Long-term loans and receivables Present value discount	0	(21)
Long-term loans and receivables	₩ 44,371	₩ 7,110

Other-Financial Assets _ Change

Other-Financial Assets : Changes in the allowance for doubtful accounts of Loans and receivables (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for doubtful accounts [Abstract]
Beginning balance	₩ 15,094	₩ 4,952	₩ 8,948
Bad debt expense	5,173	10,142	22
Other	0	0	(4,018)
Ending balance	₩ 20,267	₩ 15,094	₩ 4,952

Long-term and short-term financ

Long-term and short-term financial instruments (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Short-term financial instruments
Long / short-term financial instruments [Line Items]
Time deposits	₩ 996,265	₩ 1,034,971
CP	0	40,000
CD	50,000	15,000
RP	203,008	40,000
Others	234,209	222,000
Long / short-term financial instruments	1,483,482	1,351,971
Long-term financial instruments
Long / short-term financial instruments [Line Items]
Time deposits	160,433	257,857
CP	0	0
CD	0	0
RP	0	0
Others	418,188	350,399
Long / short-term financial instruments	₩ 578,621	₩ 608,256

Inventories (Details)

Inventories (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Inventory [Line Items]
Raw materials	₩ 3,601,188	₩ 3,789,013
Merchandise	234	340
Work-in-progress	148,067	165,073
Finished goods	42,070	58,280
Supplies	2,272,790	2,116,994
Inventories in transit	666,967	906,267
Other inventories	11,593	14,733
Total Inventories	6,742,909	7,050,700
Acquisition cost
Inventory [Line Items]
Raw materials	3,602,073	3,790,443
Merchandise	234	340
Work-in-progress	148,067	165,073
Finished goods	42,070	58,280
Supplies	2,280,682	2,121,363
Inventories in transit	666,967	906,267
Other inventories	11,593	14,733
Total Inventories	6,751,686	7,056,499
Valuation allowance
Inventory [Line Items]
Raw materials	(885)	(1,430)
Supplies	(7,892)	(4,369)
Total Inventories	₩ (8,777)	₩ (5,799)

Non-Financial Assets (Details)

Non-Financial Assets (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2020	Dec. 31, 2019
Other Current Assets
Non-Financial Assets [Line Items]
Advance payment		₩ 169,737	₩ 147,784
Prepaid Expense		216,073	308,017
Miscellaneous Non-Financial Assets
Greenhouse gas emissions rights		357,355	437,562
Other quick assets	[1]	276,993	313,014
Miscellaneous Non-Financial Assets		634,348	750,576
Non-Financial Assets		1,020,158	1,206,377
Other Noncurrent Assets
Non-Financial Assets [Line Items]
Advance payment		32,693	2,694
Prepaid Expense		140,730	84,421
Miscellaneous Non-Financial Assets
Greenhouse gas emissions rights		0	0
Other quick assets	[1]	72,969	79,814
Miscellaneous Non-Financial Assets		72,969	79,814
Non-Financial Assets		₩ 246,392	₩ 166,929
[1]	The Company recognized an impairment loss of KRW49,201 million as it was determined that there is an objective evidence of impairment related to its rights to equity interest in Orano Expansion for the year ended December 31, 2019.

Consolidated subsidiaries (Deta

Consolidated subsidiaries (Details)		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
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		Engineering and construction for utility plant and others	Engineering and construction for utility plant and others
Location		KOREA	KOREA
Proportion of ownership (%)	[1]	65.77%	65.77%
KEPCO Plant Service & Engineering Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Utility plant maintenance and others	Utility plant maintenance and others
Location		KOREA	KOREA
Proportion of ownership (%)		51.00%	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	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	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 (%)		100.00%	100.00%
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		Operation of utility plant	Operation of utility plant
Location		INDONESIA	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 Philippines Corporation
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		PHILIPPINES	PHILIPPINES
Proportion of ownership (%)		0.00%	100.00%
Reason		Liquidation
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 (%)	[3]	100.00%	100.00%
DG Whitefield, 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		Sale of shares
Springfield 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		Sale of shares
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 (%)		100.00%	100.00%
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		Power generation	Power generation
Location		PAKISTAN	PAKISTAN
Proportion of ownership (%)	[4]	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		Power generation	Power generation
Location		KOREA	KOREA
Proportion of ownership (%)	[5]	85.03%	85.03%
KEPCO KPS Philippines Corp.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Utility plant maintenance and others	Utility plant maintenance and others
Location		PHILIPPINES	PHILIPPINES
Proportion of ownership (%)		99.99%	99.99%
KOSPO Chile SpA
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company	Holding company
Location		CHILE	CHILE
Proportion of ownership (%)		100.00%	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		Operation of utility plant	Operation of utility plant
Location		KOREA	KOREA
Proportion of ownership (%)		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 (%)		96.67%	96.67%
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 (%)		80.10%	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		Holding company	Holding company
Location		USA	USA
Proportion of ownership (%)	[6]	100.00%	70.00%
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 (%)		75.99%	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%
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
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	Facility maintenance
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	Facility maintenance
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		Holding company	Holding company
Location		USA	USA
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		Facility maintenance	Facility maintenance
Location		PARKISTAN	PARKISTAN
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%
BSK E-New Industry Fund X
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company
Location		KOREA
Proportion of ownership (%)		66.80%
Reason		Newly established
Guam Ukudu Power LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation
Location		USA
Proportion of ownership (%)		100.00%
Reason		Newly established
TS Energy No. 25 Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation
Location		KOREA
Proportion of ownership (%)		90.00%
Reason		New investment
KPS Partners Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Facility maintenance and service
Location		KOREA
Proportion of ownership (%)		100.00%
Reason		Newly established
KEPCO E&C Service Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Facility maintenance and service
Location		KOREA
Proportion of ownership (%)		100.00%
Reason		Newly established
Moha Solar Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation
Location		KOREA
Proportion of ownership (%)		100.00%
Reason		New investment
Ogiri Solar Power Co., Ltd.
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Power generation
Location		KOREA
Proportion of ownership (%)		70.00%
Reason		Newly established
KHNP USA LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company
Location		USA
Proportion of ownership (%)		100.00%
Reason		Newly established
KOMIPO Vanphong Power Service LLC
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Utility plant maintenance and others
Location		VIETNAM
Proportion of ownership (%)		100.00%
Reason		Newly established
Energy Innovation Fund I
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]
Key operation activities		Holding company
Location		KOREA
Proportion of ownership (%)		71.91%
Reason		Additional acquisition
[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 through the shareholders' agreement.
[3]	As 100% of the shares held were sold after the end of the reporting period, the assets of DG Fairhaven Power, LLC were classified as assets held-for-sale.
[4]	As of the reporting date, the annual reporting period of all subsidiaries is December 31, except for Mira Power Limited which is November 30.
[5]	The Company guarantees a certain return on investment related to Commerce and Industry Energy Co., Ltd. for the financial investors. The financial investors have a right to sell their shares to the Company which can be exercised 84 months after the date of investment. Accordingly, the purchase price including the return on investment is classified as a liability.
[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.

Summary of financial informatio

Summary of financial information of consolidated subsidiaries (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020		Dec. 31, 2019
Korea Hydro & Nuclear Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	₩ 61,859,753		₩ 59,570,219
Total liabilities	35,652,467		33,917,275
Sales	9,938,941		8,969,072
Profit (loss) for the period	647,641		306,007
Korea South-East Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	10,858,645		10,938,358
Total liabilities	5,954,129		5,866,642
Sales	4,258,904		5,385,387
Profit (loss) for the period	(139,149)		41,006
Korea Midland Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	13,028,436		12,684,828
Total liabilities	9,357,603		8,977,766
Sales	4,293,364		4,479,707
Profit (loss) for the period	(29,880)		(28,449)
Korea Western Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	10,357,023		10,514,438
Total liabilities	6,594,779		6,637,451
Sales	3,605,986		4,448,992
Profit (loss) for the period	(108,953)		(46,061)
Korea Southern Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	10,658,015		10,884,799
Total liabilities	6,411,524		6,608,301
Sales	4,015,941		5,084,907
Profit (loss) for the period	(17,588)		(41,342)
Korea East-West Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	9,619,485		9,724,311
Total liabilities	4,974,645		5,022,921
Sales	4,155,416		4,855,964
Profit (loss) for the period	(65,427)		56,698
KEPCO Engineering & Construction Company, Inc.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	699,244		735,207
Total liabilities	200,169		242,994
Sales	431,723		448,635
Profit (loss) for the period	20,160		26,398
KEPCO Plant Service & Engineering Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	1,345,857		1,356,983
Total liabilities	296,515		294,757
Sales	1,299,186		1,244,613
Profit (loss) for the period	85,916		157,737
KEPCO Nuclear Fuel Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	798,368		831,604
Total liabilities	390,155		429,799
Sales	331,228		309,055
Profit (loss) for the period	14,542		24,618
KEPCO KDN Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	647,496		604,458
Total liabilities	174,192		159,807
Sales	641,308		625,567
Profit (loss) for the period	45,207		42,205
KEPCO International HongKong Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	120,213		138,942
Total liabilities	0		633
Sales	0		0
Profit (loss) for the period	1,571		3,330
KEPCO International Philippines Inc.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	133,215		107,224
Total liabilities	366		371
Sales	0		0
Profit (loss) for the period	35,182		67,991
KEPCO Gansu International Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	7,753		10,448
Total liabilities	512		545
Sales	0		0
Profit (loss) for the period	(19)		(20)
KEPCO Philippines Holdings Inc.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	187,375		200,503
Total liabilities	127		6,656
Sales	0		0
Profit (loss) for the period	65,792		66,200
KEPCO Philippines Corporation
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	6,173		6,706
Total liabilities	17		332
Sales	0		0
Profit (loss) for the period	(187)		(52)
KEPCO Ilijan Corporation
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	322,066		371,377
Total liabilities	47,234		56,156
Sales	81,400		95,072
Profit (loss) for the period	39,443		40,818
KEPCO Lebanon SARL
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	1,669		1,835
Total liabilities	9,195		9,786
Sales	0		0
Profit (loss) for the period	(59)		255
KEPCO Neimenggu International Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	213,444		200,858
Total liabilities	2,492		0
Sales	0		0
Profit (loss) for the period	26,593		(354)
KEPCO Shanxi International Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	508,363		538,604
Total liabilities	196,408		208,895
Sales	0		0
Profit (loss) for the period	2,278		151
KOMIPO Global Pte Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	263,378		269,302
Total liabilities	656		463
Sales	0		0
Profit (loss) for the period	12,460		10,400
KEPCO Netherlands B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	117,449		122,577
Total liabilities	71		101
Sales	0		0
Profit (loss) for the period	14,503		948
KOREA Imouraren Uranium Investment Corp.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	13,955		14,173
Total liabilities	123		111
Sales	0		0
Profit (loss) for the period	(675)		(49,716)
KEPCO Australia Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	451		364
Total liabilities	17		14
Sales	0		0
Profit (loss) for the period	71		(395,914)
KOSEP Australia Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	34,249		32,782
Total liabilities	3,500		2,911
Sales	14,327		15,514
Profit (loss) for the period	2,150		3,935
KOMIPO Australia Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	45,250		40,898
Total liabilities	3,782		2,909
Sales	14,327		15,514
Profit (loss) for the period	2,685		3,766
KOWEPO Australia Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	44,270		44,182
Total liabilities	2,909		5,772
Sales	14,327		15,514
Profit (loss) for the period	1,663		2,761
KOSPO Australia Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	38,341		37,254
Total liabilities	2,750		5,012
Sales	14,327		15,514
Profit (loss) for the period	2,242		2,638
KEPCO Middle East Holding Company
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	90,601		102,164
Total liabilities	78,553		87,834
Sales	0		0
Profit (loss) for the period	(1,539)		5,934
Qatrana Electric Power Company
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	464,507		490,723
Total liabilities	287,859		322,857
Sales	21,279		20,773
Profit (loss) for the period	24,717		21,807
KHNP Canada Energy, Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	63,794		44,639
Total liabilities	26		43
Sales	0		0
Profit (loss) for the period	(7)		(10)
KEPCO Bylong Australia Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	44,691		45,207
Total liabilities	349,542		355,163
Sales	0		0
Profit (loss) for the period	16,897		(220,909)
Korea Waterbury Uranium Limited Partnership
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	20,908		20,717
Total liabilities	165		167
Sales	0		0
Profit (loss) for the period	(76)		(77)
KEPCO Holdings de Mexico
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	148		187
Total liabilities	27		25
Sales	0		0
Profit (loss) for the period	(14)		(14)
KST Electric Power Company, S.A.P.I. de C.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	531,367		539,952
Total liabilities	410,743		449,459
Sales	65,695		55,783
Profit (loss) for the period	37,899		(20,797)
KEPCO Energy Service Company
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	2,255		2,262
Total liabilities	994		1,995
Sales	5,880		5,984
Profit (loss) for the period	507		(481)
KEPCO Netherlands S3 B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	44,042		50,352
Total liabilities	54		49
Sales	0		0
Profit (loss) for the period	2,833		2,637
PT. KOMIPO Pembangkitan Jawa Bali
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	12,946		12,391
Total liabilities	3,298		5,719
Sales	20,306		18,722
Profit (loss) for the period	4,775		4,312
PT. Cirebon Power Service
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	1,825		2,089
Total liabilities	550		313
Sales	8,642		8,049
Profit (loss) for the period	344		406
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 period	0		(2)
KOSPO Jordan LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	31,620		17,489
Total liabilities	15,654		1,521
Sales	9,356		10,878
Profit (loss) for the period	1,570		2,634
EWP Philippines Corporation
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets			1,691
Total liabilities			888
Sales			0
Profit (loss) for the period			(111)
EWP America Inc.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	37,681	[1]	66,622	[2]
Total liabilities	2,683	[1]	2,619	[2]
Sales	14,312	[1]	21,719	[2]
Profit (loss) for the period	(14,327)	[1]	(6,497)	[2]
KNF Canada Energy Limited
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	1,871		1,933
Total liabilities	22		24
Sales	0		0
Profit (loss) for the period	(50)		(48)
EWP Barbados 1 SRL
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	313,409		279,295
Total liabilities	1,170		1,031
Sales	2,950		2,914
Profit (loss) for the period	44,729		2,368
Gyeonggi Green Energy Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	265,768		194,425
Total liabilities	240,366		159,078
Sales	64,660		13,717
Profit (loss) for the period	(9,968)		(73,394)
PT. Tanggamus Electric Power
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	217,730		228,601
Total liabilities	184,057		195,826
Sales	3,491		2,256
Profit (loss) for the period	11,942		(4,529)
Gyeongju Wind Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	105,726		113,745
Total liabilities	68,629		75,427
Sales	13,939		15,548
Profit (loss) for the period	2,108		3,384
KOMIPO America Inc.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	105,926		9,424
Total liabilities	918		593
Sales	342		118
Profit (loss) for the period	(1,783)		(1,033)
KOSEP USA, Inc.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	1		1
Total liabilities	4,837		5,147
Sales	0		0
Profit (loss) for the period	0		(119)
PT. EWP Indonesia
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	33,900		34,455
Total liabilities	1,125		5
Sales	0		0
Profit (loss) for the period	7,083		5,124
KEPCO Netherlands J3 B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	138,824		120,006
Total liabilities	84		74
Sales	0		0
Profit (loss) for the period	28,242		(79)
Korea Offshore Wind Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	354,643		284,495
Total liabilities	187,576		117,527
Sales	26,838		0
Profit (loss) for the period	98		(12,768)
Global One Pioneer B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	177		180
Total liabilities	60		73
Sales	0		0
Profit (loss) for the period	(76)		(86)
Global Energy Pioneer B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	338		348
Total liabilities	64		80
Sales	0		0
Profit (loss) for the period	(70)		(90)
Mira Power Limited
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	348,737		356,111
Total liabilities	266,565		285,577
Sales	31,172		0
Profit (loss) for the period	(2,960)		(971)
KOSEP Material Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	2,312		2,788
Total liabilities	429		1,186
Sales	3,457		3,357
Profit (loss) for the period	189		22
Commerce and Industry Energy Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	89,681		90,637
Total liabilities	41,384		43,985
Sales	31,603		32,728
Profit (loss) for the period	1,623		(7,532)
KEPCO KPS Philippines Corp.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	3,119		5,198
Total liabilities	284		1,341
Sales	5,151		6,246
Profit (loss) for the period	158		2
KOSPO Chile SpA
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	128,795		134,827
Total liabilities	48,813		49,183
Sales	0		0
Profit (loss) for the period	(542)		(456)
PT. KOWEPO Sumsel Operation and Maintenance Services
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	108		135
Total liabilities	241		262
Sales	0		0
Profit (loss) for the period	(15)		(1,104)
HeeMang Sunlight Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	7,261		12,185
Total liabilities	4,339		8,545
Sales	423		643
Profit (loss) for the period	(142)		75
Fujeij Wind Power Company
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	194,844		218,333
Total liabilities	174,051		196,964
Sales	0		0
Profit (loss) for the period	13,720		5,515
KOSPO Youngnam Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	389,071		398,495
Total liabilities	294,408		307,226
Sales	254,966		318,338
Profit (loss) for the period	3,405		3,514
VI Carbon Professional Private Special Asset Investment Trust 1
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	3,006		3,002
Total liabilities	4		0
Sales	0		0
Profit (loss) for the period	7		12
Chitose Solar Power Plant LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	133,643		121,457
Total liabilities	118,783		106,254
Sales	17,073		17,103
Profit (loss) for the period	1,521		5,480
KEPCO Energy Solution Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	313,754		308,188
Total liabilities	4,093		2,142
Sales	5,585		2,843
Profit (loss) for the period	3,656		2,805
KEPCO Solar Co., Ltd. (formerly, Solar School Plant Co., Ltd.)
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	230,443		208,730
Total liabilities	23,098		3,269
Sales	3,933		1,962
Profit (loss) for the period	1,888		2,553
KOSPO Power Services Ltda.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	4,354		3,244
Total liabilities	1,644		1,564
Sales	10,846		10,013
Profit (loss) for the period	1,011		452
Energy New Industry Specialized Investment Private Investment Trust
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	279,489	[3]	100,116	[4]
Total liabilities	24,173	[3]	17,359	[4]
Sales	23,682	[3]	2,418	[4]
Profit (loss) for the period	8,248	[3]	(7,735)	[4]
KOEN Bylong Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	6		0
Total liabilities	75		39
Sales	0		0
Profit (loss) for the period	(11)		(14)
KOMIPO Bylong Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	7		4
Total liabilities	76		43
Sales	0		0
Profit (loss) for the period	(11)		(14)
KOWEPO Bylong Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	6		4
Total liabilities	64		40
Sales	0		0
Profit (loss) for the period	0		(12)
KOSPO Bylong Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	153		4
Total liabilities	213		40
Sales	0		0
Profit (loss) for the period	(2)		(12)
EWP Bylong Pty., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	6		4
Total liabilities	35		40
Sales	0		0
Profit (loss) for the period	28		(12)
KOWEPO Lao International
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	8,982		5,430
Total liabilities	392		575
Sales	8,466		4,308
Profit (loss) for the period	4,706		1,584
KEPCO US Inc.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	16,154		17,231
Total liabilities	0		0
Sales	0		0
Profit (loss) for the period	(21)		0
KEPCO Alamosa LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	31,353		33,515
Total liabilities	270		183
Sales	127		145
Profit (loss) for the period	(237)		(311)
KEPCO Solar of Alamosa, LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	68,336		65,468
Total liabilities	42,910		50,348
Sales	9,096		8,739
Profit (loss) for the period	(2,052)		(1,902)
KEPCO Mangilao Holdings LLC (formerly, KEPCO-LG CNS Mangilao Holdings LLC)
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	25,785		27,439
Total liabilities	28,924		30,287
Sales	0		0
Profit (loss) for the period	(502)		(1,240)
Mangilao Investment LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	38,090		39,972
Total liabilities	14		0
Sales	0		0
Profit (loss) for the period	(15)		0
KEPCO Mangilao Solar, LLC (formerly, KEPCO-LG CNS Mangilao Solar, LLC)
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	69,830		39,373
Total liabilities	34,029		11
Sales	0		0
Profit (loss) for the period	(253)		(524)
Jeju Hanlim Offshore Wind Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	20,525		14,328
Total liabilities	9,805		558
Sales	0		0
Profit (loss) for the period	(3,049)		(2,459)
PT. Siborpa Eco Power
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	10,491		11,574
Total liabilities	14		71
Sales	0		0
Profit (loss) for the period	(361)		(1,165)
PT. Korea Energy Indonesia
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	1,746		1,592
Total liabilities	196		121
Sales	2,428		2,462
Profit (loss) for the period	190		323
KOLAT SpA
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	31,109		31,178
Total liabilities	425		167
Sales	243		656
Profit (loss) for the period	(216)		(296)
KEPCO California, LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	41,973		44,074
Total liabilities	4,683		936
Sales	0		358
Profit (loss) for the period	(1,330)		(513)
KEPCO Mojave Holdings, LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	95,326		103,815
Total liabilities	67,138		69,544
Sales	0		0
Profit (loss) for the period	(4,358)		(4,215)
Incheon Fuel Cell Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	192,184		22,669
Total liabilities	170,976		475
Sales	0		0
Profit (loss) for the period	(979)		(1,010)
KOEN Service Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	6,239		5,347
Total liabilities	5,598		4,252
Sales	32,150		25,890
Profit (loss) for the period	129		543
KOMIPO Service Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	3,381		3,327
Total liabilities	3,649		2,622
Sales	28,596		24,556
Profit (loss) for the period	(479)		146
KOWEPO Service Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	6,045		4,228
Total liabilities	4,849		3,302
Sales	29,559		23,982
Profit (loss) for the period	726		389
KOSPO Service Co., Ltd
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	5,617		3,493
Total liabilities	4,708		2,788
Sales	25,103		18,741
Profit (loss) for the period	832		135
EWP Service Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	4,568		4,786
Total liabilities	4,074		4,064
Sales	23,223		20,837
Profit (loss) for the period	(15)		162
PT. KOMIPO Energy Indonesia
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	2,473		2,647
Total liabilities	154		196
Sales	2,391		1,392
Profit (loss) for the period	52		79
KNF Partners Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	1,470		1,378
Total liabilities	743		890
Sales	5,487		3,383
Profit (loss) for the period	256		187
KOSPO USA Inc.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	120,380		5,896
Total liabilities	266		127
Sales	0		0
Profit (loss) for the period	(1,611)		(1,408)
Nambu USA LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	42,739		245
Total liabilities	0		1
Sales	0		0
Profit (loss) for the period	544		245
Tamra Offshore Wind Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	150,957		156,708
Total liabilities	112,184		121,724
Sales	22,200		19,670
Profit (loss) for the period	4,575		1,154
KEPCO MCS Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	59,227		26,510
Total liabilities	36,786		22,151
Sales	342,053		129,393
Profit (loss) for the period	19,190		3,408
KEPCO FMS Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	14,390		11,336
Total liabilities	12,585		10,638
Sales	89,228		37,627
Profit (loss) for the period	837		198
Firstkeepers Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	13,981		1,552
Total liabilities	12,234		2,800
Sales	68,538		121
Profit (loss) for the period	2,994		(2,239)
Secutec Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	11,473		322
Total liabilities	9,771		229
Sales	62,256		0
Profit (loss) for the period	1,609		(597)
SE Green Energy Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	152,205		132,727
Total liabilities	122,606		105,619
Sales	19,731		0
Profit (loss) for the period	2,463		816
KEPCO Mangilao America LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	1,793		0
Total liabilities	0		0
Sales	0		0
Profit (loss) for the period	0		0
Mangilao Intermediate Holdings LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	100,609		13,220
Total liabilities	80,210		12,774
Sales	0		0
Profit (loss) for the period	(3,708)		(66)
KEPCO CSC Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	8,817		837
Total liabilities	5,551		51
Sales	38,465		0
Profit (loss) for the period	2,479		(14)
KOAK Power Limited
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	15,864		15,930
Total liabilities	1,118		0
Sales	0		0
Profit (loss) for the period	607		0
KOMIPO Europe B.V.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	43,198		7,362
Total liabilities	46		0
Sales	333		0
Profit (loss) for the period	(386)		(286)
Haenanum Energy Fund
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	28,219		28,101
Total liabilities	132		1
Sales	128		0
Profit (loss) for the period	(13)		1
Paju Ecoenergy Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	57,320		53,839
Total liabilities	3,506		0
Sales	3,069		0
Profit (loss) for the period	247		₩ 0
Guam Ukudu Power LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	3,165
Total liabilities	3,589
Sales	0
Profit (loss) for the period	(1,577)
TS Energy No. 25 Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	184,667
Total liabilities	142,709
Sales	0
Profit (loss) for the period	(3,779)
KPS Partners Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	2,139
Total liabilities	1,127
Sales	3,562
Profit (loss) for the period	313
KEPCO E&C Service Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	2,514
Total liabilities	1,549
Sales	4,989
Profit (loss) for the period	464
Moha Solar Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	7,390
Total liabilities	7,809
Sales	0
Profit (loss) for the period	(364)
Ogiri Solar Power Co., Ltd.
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	1,032
Total liabilities	0
Sales	0
Profit (loss) for the period	0
KHNP USA LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	464
Total liabilities	23
Sales	229
Profit (loss) for the period	119
KOMIPO Vanphong Power Service LLC
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	1,727
Total liabilities	12
Sales	0
Profit (loss) for the period	(34)
Energy Innovation Fund I
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]
Total assets	8,412
Total liabilities	1
Sales	25
Profit (loss) for the period	₩ (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 EWP America Inc. includes that of six other subsidiaries, EWP Renewable Corporation, DG Fairhaven Power, LLC, DG Whitefield, LLC, Springfield Power, LLC, California Power Holdings, LLC, and EWPRC Biomass Holdings, LLC.
[3]	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.
[4]	Financial information of Energy New Industry Specialized Investment Private Investment Trust includes that of three other subsidiaries, BSK E-New Industry Fund VII, e-New Industry LB Fund 1 and Songhyun e-New Industry Fund.

Details of non-controlling inte

Details of non-controlling interest prior to intra-group eliminations (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Subsidiaries [Member]
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]
Current assets of subsidiaries	₩ 2,029,674	₩ 2,075,884	₩ 2,030,665
Non-current assets of subsidiaries	4,638,564	4,421,596	4,165,052
Current liabilities of subsidiaries	(867,786)	(933,560)	(1,094,870)
Non-current liabilities of subsidiaries	(2,602,653)	(2,304,159)	(2,058,206)
Net assets of subsidiaries	3,197,799	3,259,761	3,042,641
Book value of non-controlling interest	1,370,166	1,393,331	1,502,377
Sales of subsidiaries	2,769,001	2,643,343	2,739,186
Profit for the period of subsidiaries	253,180	175,990	315,816
Profit for the period attributable to non-controlling interest of subsidiaries	101,122	81,982	135,970
Cash flows from operating activities of subsidiaries	452,206	512,611	414,012
Cash flows from investing activities of subsidiaries	(661,844)	(393,916)	(143,447)
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries	282,681	75,591	(476,730)
Dividends to non-controlling interests of subsidiaries	(81,298)	(99,256)	(110,331)
Effect of exchange rate fluctuation of subsidiaries	(18,239)	4,005	4,051
Net increase (decrease) of cash and cash equivalents of subsidiaries	₩ (26,494)	₩ 99,035	₩ (312,445)
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	₩ 236,602	₩ 173,931	₩ 163,622
Non-current assets of subsidiaries	85,464	197,446	267,822
Current liabilities of subsidiaries	(12,322)	(11,990)	(16,819)
Non-current liabilities of subsidiaries	(34,912)	(44,166)	(36,594)
Net assets of subsidiaries	274,832	315,221	378,031
Book value of non-controlling interest	134,668	154,458	185,235
Sales of subsidiaries	81,400	95,072	99,844
Profit for the period of subsidiaries	39,443	40,818	49,631
Profit for the period attributable to non-controlling interest of subsidiaries	19,327	20,001	24,319
Cash flows from operating activities of subsidiaries	121,835	101,707	92,822
Cash flows from investing activities of subsidiaries	7,561	4,458	(4,452)
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries	(31,793)	(68,678)	(53,733)
Dividends to non-controlling interests of subsidiaries	(30,319)	(48,750)	(51,626)
Effect of exchange rate fluctuation of subsidiaries	(8,153)	2,111	2,840
Net increase (decrease) of cash and cash equivalents of subsidiaries	₩ 59,131	₩ (9,152)	₩ (14,149)
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	₩ 755,454	₩ 779,764	₩ 628,725
Non-current assets of subsidiaries	590,403	577,219	646,640
Current liabilities of subsidiaries	(254,495)	(247,737)	(270,097)
Non-current liabilities of subsidiaries	(42,020)	(47,020)	(26,331)
Net assets of subsidiaries	1,049,342	1,062,226	978,937
Book value of non-controlling interest	514,177	520,491	479,679
Sales of subsidiaries	1,299,186	1,244,613	1,239,604
Profit for the period of subsidiaries	85,916	157,737	160,791
Profit for the period attributable to non-controlling interest of subsidiaries	42,099	77,291	78,788
Cash flows from operating activities of subsidiaries	74,159	164,373	129,700
Cash flows from investing activities of subsidiaries	26,748	(89,159)	(123,593)
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries	(47,809)	(44,332)	(33,737)
Dividends to non-controlling interests of subsidiaries	(42,336)	(39,466)	(32,414)
Effect of exchange rate fluctuation of subsidiaries	(2,171)	(593)	(124)
Net increase (decrease) of cash and cash equivalents of subsidiaries	₩ 8,591	₩ (9,177)	₩ (60,168)
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	₩ 235,805	₩ 257,593	₩ 281,390
Non-current assets of subsidiaries	463,439	477,614	490,090
Current liabilities of subsidiaries	(186,296)	(223,522)	(248,402)
Non-current liabilities of subsidiaries	(13,873)	(19,472)	(61,698)
Net assets of subsidiaries	499,075	492,213	461,380
Book value of non-controlling interest	169,286	166,959	156,500
Sales of subsidiaries	431,723	448,635	433,701
Profit for the period of subsidiaries	20,160	26,398	12,937
Profit for the period attributable to non-controlling interest of subsidiaries	6,838	8,954	4,388
Cash flows from operating activities of subsidiaries	15,225	27,081	81,042
Cash flows from investing activities of subsidiaries	(34,333)	47,219	(50,569)
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries	(9,165)	(34,632)	(14,591)
Dividends to non-controlling interests of subsidiaries	(4,000)	(1,807)	(2,839)
Effect of exchange rate fluctuation of subsidiaries	(22)	(14)	31
Net increase (decrease) of cash and cash equivalents of subsidiaries	(32,295)	37,847	13,074
Others
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]
Current assets of subsidiaries	801,813	864,596	956,928
Non-current assets of subsidiaries	3,499,258	3,169,317	2,760,500
Current liabilities of subsidiaries	(414,673)	(450,311)	(559,552)
Non-current liabilities of subsidiaries	(2,511,848)	(2,193,501)	(1,933,583)
Net assets of subsidiaries	1,374,550	1,390,101	1,224,293
Book value of non-controlling interest	552,035	551,423	680,963
Sales of subsidiaries	956,692	855,023	966,037
Profit for the period of subsidiaries	107,661	(48,963)	92,457
Profit for the period attributable to non-controlling interest of subsidiaries	32,858	(24,264)	28,475
Cash flows from operating activities of subsidiaries	240,987	219,450	110,448
Cash flows from investing activities of subsidiaries	(661,820)	(356,434)	35,167
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries	371,448	223,233	(374,669)
Dividends to non-controlling interests of subsidiaries	(4,643)	(9,233)	(23,452)
Effect of exchange rate fluctuation of subsidiaries	(7,893)	2,501	1,304
Net increase (decrease) of cash and cash equivalents of subsidiaries	₩ (61,921)	₩ 79,517	₩ (251,202)

Gain (loss) from Disposals of s

Gain (loss) from Disposals of subsidiaries (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
gain (loss) of Disposaled subsidiaries
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries	[1]	₩ (6,610)	₩ (256)	₩ 72
Fair value of Disposaled subsidiaries
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries		1,473	4	160
Consideration received in cash
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries		389	4	160
Net assets transferred due to liquidation
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries		1,084	0	0
Carrying value of Disposaled subsidiaries
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries		7,827	73	158
Cash and Cash Equivalents
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries		1,656	97	175
Trade receivables
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries		395	0	11
Inventories
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries		2,801	0	0
Other non-financial assets
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries		98	1	0
PP&E and intangible assets
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries		3,812	2	0
Trade and other payables
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries		(935)	(3)	(28)
Other non-financial liabilities
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries		0	(24)	0
Realization of unrealized gain
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries		0	(187)	70
Other comprehensive income (loss) (cumulative foreign currency translation of foreign operations)
Disclosure of Gain (loss) of Disposaled subsidiaries [Line Items]
gain (loss) of Disposaled subsidiaries		₩ 256	₩ 0	₩ 0
[1]	Gain (loss) on disposals of subsidiaries is included in the 'Gain (loss) on disposal of investments in subsidiaries' the consolidated statements of comprehensive income (loss).

Cashflows From Disposaled subsi

Cashflows From Disposaled subsidiaries (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of Cashflows From Disposaled subsidiaries [Abstract]
Consideration received in cash	₩ 389	₩ 4	₩ 160
Less: cash and cash equivalents held by disposed subsidiaries	(1,656)	(97)	(175)
Net cash flow	₩ (1,267)	₩ (93)	₩ (15)

Cash dividends received from su

Cash dividends received from subsidiaries (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Subsidiaries
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	₩ 362,162	₩ 353,310	₩ 704,782
Korea Hydro & Nuclear Power Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	106,675	0	281,234
Korea South-East Power Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	11,905	7,143	33,928
Korea Midland Power Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	0	26,581
Korea Western Power Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	0	28,996
Korea Southern Power Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	15,277	25,780
Korea East-West Power Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	17,959	985	61,408
KEPCO Engineering & Construction Company, Inc.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	7,793	3,519	5,531
KEPCO Plant Service & Engineering Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	44,068	41,084	33,739
KEPCO Nuclear Fuel Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	7,270	4,219	1,077
KEPCO KDN Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	14,720	19,136	13,888
KEPCO International HongKong Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	11,858	10,243	23,314
KEPCO International Philippines Inc.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	70,480	52,507
KEPCO Ilijan Corporation
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	34,502	65,776	53,900
KEPCO Philippines Holdings Inc.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	70,876	63,522	0
KOSEP Australia Pty., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	1,856	8,120	0
KOSPO Australia Pty., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	4,335	0
Qatrana Electric Power Company
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	10,313	6,240
KEPCO KPS Philippines Corp.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	1,215	3,854	0
Tamra Offshore Wind Power Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	2,640	4,823	0
KEPCO Netherlands S3 B.V.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	6,981	874	3,115
PT. KOMIPO Pembangkitan Jawa Bali
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	1,971	20,658
KEPCO Netherlands J3 B.V.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	0	12,090
Gyeongju Wind Power Co., Ltd.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	2,800	2,800	0
VI Carbon Professional Private Special Asset Investment Trust 1
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	7	11	11
KOSPO Power Services Ltda.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	0	745	993
KEPCO Netherlands B.V.
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	11,098	13,266	17,424
PT. Cirebon Power Service
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	221	0	382
Chitose Solar Power Plant LLC
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	858	814	1,986
Fujeij Wind Power Company
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	6,306	0	0
KOSPO Jordan LLC
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	535	0	0
Energy Innovation Fund I
Disclosure of Cash dividends received from subsidiaries [Line Items]
Cash dividends received from subsidiaries	₩ 19	₩ 0	₩ 0

Investments in Associates (Deta

Investments in Associates (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019
Disclosure of associates [Line Items]
Acquisition cost		₩ 2,481,761		₩ 2,539,956
Book value
Beginning balance		4,251,802		4,064,820
Acquisition		96,255		17,659
Disposal		(207)		0
Dividends received		(98,175)		(136,012)
Share of income (loss)		59,092		37,418
Other comprehensive income (loss)		(48,911)		39,199
Others (book value)		(9,069)		228,718
Ending balance		₩ 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
Location		KOREA		KOREA
Percentage of ownership		20.47%	[1]	20.47%	[2]
Effective percentage of ownership	[3]	22.02%		21.57%
Acquisition cost		₩ 94,500		₩ 94,500
Book value
Beginning balance		1,693,967		1,701,848
Acquisition		0		0
Disposal		0		0
Dividends received		(7,182)		(25,704)
Share of income (loss)		(14,104)		8,511
Other comprehensive income (loss)		(25,023)		12,687
Others (book value)		(333)		(3,375)
Ending balance		1,647,325		1,693,967
The fair value of associates		584,010		715,365
Share in net assets		1,703,281		1,757,205
Total assets		35,909,775		39,311,855
Total liabilities		28,174,619		31,165,334
Net assets		7,735,156		8,146,521
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(55,956)		(63,238)
Sales of Associates		20,833,722		24,982,640
Profit (loss) for the period of Associates		₩ (172,060)	[4]	₩ 38,764	[5]
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%
Effective percentage of ownership	[3]	29.00%		29.00%
Acquisition cost		₩ 4,727		₩ 4,727
Book value
Beginning balance		25,393		21,838
Acquisition		0		0
Disposal		0		0
Dividends received		(2,146)		(1,598)
Share of income (loss)		3,806		5,002
Other comprehensive income (loss)		0		0
Others (book value)		(1,423)		151
Ending balance		25,630		25,393
The fair value of associates		45,048		33,089
Share in net assets		25,630		25,393
Total assets		164,015		186,434
Total liabilities		75,636		98,872
Net assets		88,379		87,562
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		297,962		306,026
Profit (loss) for the period of Associates		₩ 16,284		₩ 17,467
YTN Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Broadcasting		Broadcasting
Location		KOREA		KOREA
Percentage of ownership		21.43%		21.43%
Effective percentage of ownership	[3]	21.43%		21.43%
Acquisition cost		₩ 59,000		₩ 59,000
Book value
Beginning balance		39,747		40,338
Acquisition		0		0
Disposal		0		0
Dividends received		(90)		(180)
Share of income (loss)		1,086		(449)
Other comprehensive income (loss)		(6)		5
Others (book value)		(188)		33
Ending balance		40,549		39,747
The fair value of associates		27,000		18,450
Share in net assets		40,549		39,747
Total assets		295,151		281,699
Total liabilities		105,923		96,211
Net assets		189,228		185,488
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		126,730		127,782
Profit (loss) for the period of Associates		₩ 7,095		₩ (1,230)
Cheongna Energy Co., Ltd.
Disclosure of associates [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		43.90%		43.90%
Effective percentage of ownership	[3]	43.90%		43.90%
Acquisition cost		₩ 0		₩ 48,353
Book value
Beginning balance		1,411		3,465
Acquisition		990		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		2,518		(2,054)
Other comprehensive income (loss)		0		0
Others (book value)		(4,919)		0
Ending balance		0		1,411
Share in net assets		0		(112)
Total assets		0		383,034
Total liabilities		0		383,288
Net assets		0		(254)
Investment differential		0		2,584
Intercompany transaction		0		(1,061)
Others (consolidated FS)		0		0
Sales of Associates		0		68,626
Profit (loss) for the period of Associates		₩ 0		₩ (2,567)
Gangwon Wind Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[6]	15.00%		15.00%
Effective percentage of ownership	[3]	15.00%		15.00%
Acquisition cost		₩ 5,725		₩ 5,725
Book value
Beginning balance		12,327		13,220
Acquisition		0		0
Disposal		0		0
Dividends received		(1,988)		(2,272)
Share of income (loss)		1,104		1,379
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		11,443		12,327
Share in net assets		11,394		12,278
Total assets		77,297		83,528
Total liabilities		1,336		1,674
Net assets		75,961		81,854
Investment differential		49		49
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		23,350		24,116
Profit (loss) for the period of Associates		₩ 7,472		₩ 9,380
Hyundai Green Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		29.00%		29.00%
Effective percentage of ownership	[3]	29.00%		29.00%
Acquisition cost		₩ 88,885		₩ 88,885
Book value
Beginning balance		124,253		127,160
Acquisition		0		0
Disposal		0		0
Dividends received		(8,889)		(8,889)
Share of income (loss)		17,410		5,982
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		132,774		124,253
Share in net assets		132,774		124,253
Total assets		874,574		1,086,738
Total liabilities		416,732		658,279
Net assets		457,842		428,459
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		390,442		507,653
Profit (loss) for the period of Associates		₩ 55,591		₩ 26,222
Shareholders' agreements that may cause future economic resource or cash outflows		As of December 31, 2020, 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.		As of December 31, 2019, Hyundai Green Power Co., Ltd., an associate of the Group, which engages in the byproduct gas power generating business, entered into a project financing agreement with a limit of W919.2 billion with Korea Development Bank and others. At a certain period in the future, the Group has call option against the financial investors (Korea Development Bank and others) and also has an obligation to purchase its shares when claimed by the financial investors. At a certain period in the future, the Group 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 Company.
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%	[7]	100.00%	[8]
Effective percentage of ownership	[3]	100.00%		100.00%
Acquisition cost		₩ 127,839		₩ 127,839
Book value
Beginning balance		258,899		251,802
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		1,860		10,907
Other comprehensive income (loss)		1		0
Others (book value)		8,362		(3,810)
Ending balance		269,122		258,899
Share in net assets		269,122		260,757
Total assets		337,577		315,683
Total liabilities		68,455		54,926
Net assets		269,122		260,757
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		(1,858)
Sales of Associates		104,698		107,034
Profit (loss) for the period of Associates		₩ 979		₩ 8,268
AMEC Partners Korea Ltd.
Disclosure of associates [Line Items]
Key operation activities		Resources development		Resources development
Location		KOREA		KOREA
Percentage of ownership		19.00%		19.00%
Effective percentage of ownership	[3]	19.00%		19.00%
Acquisition cost		₩ 0		₩ 0
Book value
Beginning balance		0		209
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		0		0
Other comprehensive income (loss)		0		3
Others (book value)		0		(212)
Ending balance		0		0
Share in net assets		0		0
Total assets		0
Total liabilities		0
Net assets		0
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ 0		₩ 0
DAYONE Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.)
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		30.66%		30.66%	[9]
Effective percentage of ownership	[3]	46.30%		46.30%
Acquisition cost		₩ 0		₩ 71,070
Book value
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
Share in net assets		0		(39,217)
Total assets		0		465,238
Total liabilities		0		549,940
Net assets		0		(84,702)
Investment differential		0		0
Intercompany transaction		0		(954)
Others (consolidated FS)		0		40,171
Sales of Associates		0		91,842
Profit (loss) for the period of Associates		0		(27,882)
Unrecognized equity interest		(14,035)		12,890
Accumulated unrecognized equity interest		₩ 24,696		₩ 38,731
Shareholders' agreements that may cause future economic resource or cash outflows				The Company had placed guarantees for a fixed return on the investment to NH Power II Co., Ltd. and National Agricultural Cooperative Federation ("NACF") and had obtained the rights to acquire the investment securities in return preferentially. In addition, NH Power II Co., Ltd. and NACF have a right, which can be exercised for 30 days starting from 2 months to 1 month prior to 17 years after the termination date of the contract to sell their shares to the Company.
Ecollite Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Artificial light-weight aggregate		Artificial light-weight aggregate
Location		KOREA		KOREA
Percentage of ownership		0.00%		36.10%
Effective percentage of ownership	[3]	0.00%		36.10%
Acquisition cost		₩ 0		₩ 1,516
Book value
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	[10]	0
Share in net assets		0		554
Total assets		0		1,838
Total liabilities		0		304
Net assets		0		1,534
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		(554)
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ 0		₩ (97)
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%
Effective percentage of ownership	[3]	25.00%		25.00%
Acquisition cost		₩ 3,810		₩ 3,810
Book value
Beginning balance		7,039		5,665
Acquisition		0		0
Disposal		0		0
Dividends received		(175)		0
Share of income (loss)		(472)		1,374
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		6,392		7,039
Share in net assets		6,392		7,039
Total assets		28,048		36,182
Total liabilities		2,480		8,027
Net assets		25,568		28,155
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		4,364		6,177
Profit (loss) for the period of Associates		₩ (561)		₩ 5,494
Shareholders' agreements that may cause future economic resource or cash outflows		In the case where non-controlling shareholders decide to dispose of their shares in Taebaek Wind Power Co., Ltd. after the warrant period of defect repair for wind power generator has expired, the Company acquires those shares at fair value. The acquisition is to be made after the conditions of the acquisition are discussed among the parties involved, with consideration of various factors such as financial status and business situation.		In the case where non-controlling shareholders decide to dispose of their shares in Taebaek Wind Power Co., Ltd. after the warrant period of defect repair for wind power generator has expired, the Group acquires those shares at fair value. The acquisition is to be made after the conditions of the acquisition are discussed among the parties involved, with consideration of various factors such as financial status and business situation.
Significant restrictions on its abilities				Financial institutions can reject or defer an approval with regard to the request for fund executions on subordinated loans of shareholders in order to pay senior loans based on the loan agreement. 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 is obtained.
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%
Effective percentage of ownership	[3]	25.00%		25.00%
Acquisition cost		₩ 3,420		₩ 3,420
Book value
Beginning balance		2,553		2,569
Acquisition		0		0
Disposal		0		0
Dividends received		0
Share of income (loss)		534		(16)
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		3,087		2,553
Share in net assets		3,087		2,553
Total assets		44,434		35,061
Total liabilities		32,085		24,847
Net assets		12,349		10,214
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		5,023		349
Profit (loss) for the period of Associates		₩ 1,368		₩ (61)
Shareholders' agreements that may cause future economic resource or cash outflows				At the commencement of the operation of the faciliity, the Group has a right to purchase all or part of the shares from the shareholders at fair value.
Significant restrictions on its abilities		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.		Dividends can only be paid when all conditions of the shareholder's agreement are satisfied. Also, shares cannot be wholly or partially transferred without consent of the stakeholders is obtained.
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%
Effective percentage of ownership	[3]	25.00%		25.00%
Acquisition cost		₩ 3,875		₩ 3,875
Book value
Beginning balance		5,877		5,419
Acquisition		0		0
Disposal		0
Dividends received		(813)
Share of income (loss)		(37)		458
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		5,027		5,877
Share in net assets		5,027		5,877
Total assets		72,713		79,756
Total liabilities		52,606		56,248
Net assets		20,107		23,508
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		8,387		10,713
Profit (loss) for the period of Associates		₩ (154)		₩ 2,010
Shareholders' agreements that may cause future economic resource or cash outflows		In the case where non-controlling shareholders decide to dispose of their shares in Pyeongchang Wind Power Co., Ltd. after commercial operation of the power plant has started, the Company acquires those shares at fair value. The acquisition is to be made after the conditions of the acquisition are discussed among the parties involved, with the careful consideration of various factors such as financial status and business situation. The Company is under agreement of O&M with the entity. Pursuant to the agreement, the Company guarantees a certain level of utilization rate and it is obligated to pay the penalty in the event of suspension in power generating.		In the case where non-controlling shareholders decide to dispose of their shares in Pyeongchang Wind Power Co., Ltd. after commercial operation of the power plant has started, the Group acquires those shares at fair value. The acquisition is to be made after the conditions of the acquisition are discussed among the parties involved, with the careful consideration of various factors such as financial status and business situation.
Significant restrictions on its abilities		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.		Principals 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 written consent of financial institutions is obtained.
Daeryun Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[6]	9.34%		9.34%
Effective percentage of ownership	[3]	9.34%		9.34%
Acquisition cost		₩ 40,854		₩ 40,854
Book value
Beginning balance		26,247		26,099
Acquisition		0		0
Disposal		0		0
Dividends received		0
Share of income (loss)		104		173
Other comprehensive income (loss)		0
Others (book value)		2		(25)
Ending balance		26,353		26,247
Share in net assets		27,173		27,066
Total assets		789,277		802,546
Total liabilities		498,346		512,757
Net assets		290,931		289,789
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(820)		(819)
Sales of Associates		126,343		163,129
Profit (loss) for the period of Associates		₩ 1,941		₩ 1,836
Shareholders' agreements that may cause future economic resource or cash outflows		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.
Significant restrictions on its abilities		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.		Principals 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 and Shares cannot be wholly or partially transferred without consent of the majority of lenders is obtained.
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%
Effective percentage of ownership	[3]	30.00%		30.00%
Acquisition cost		₩ 3,801		₩ 3,801
Book value
Beginning balance		8,520		8,086
Acquisition		0		0
Disposal		0		0
Dividends received		(750)		0
Share of income (loss)		97		434
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		7,867		8,520
Share in net assets		7,867		8,520
Total assets		27,515		29,875
Total liabilities		1,292		1,476
Net assets		26,223		28,399
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		4,777		6,076
Profit (loss) for the period of Associates		₩ 656		₩ 1,447
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%
Effective percentage of ownership	[3]	27.00%		27.00%
Acquisition cost		₩ 1,296		₩ 1,296
Book value
Beginning balance		2,382		2,337
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		54		45
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		2,436		2,382
Share in net assets		2,436		2,382
Total assets		18,240		20,465
Total liabilities		9,219		11,641
Net assets		9,021		8,824
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		3,564		3,377
Profit (loss) for the period of Associates		₩ 728		₩ 278
Significant restrictions on its abilities		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.		Principal and interest, dividends to shareholders cannot be paid without written consent of financial institutions. Also, Shares cannot be wholly or partially transferred without consent of other shareholders is obtained.
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%
Effective percentage of ownership	[3]	38.00%		38.00%
Acquisition cost		₩ 20,635		₩ 20,635
Book value
Beginning balance		63,583		57,558
Acquisition		0		0
Disposal		0		0
Dividends received		(10,764)		(14,229)
Share of income (loss)		5,491		5,929
Other comprehensive income (loss)		11,649		14,286
Others (book value)		(47)		39
Ending balance		69,912		63,583
The fair value of associates		139,698		117,230
Share in net assets		90,348		86,672
Total assets		255,462		250,544
Total liabilities		17,705		22,459
Net assets		237,757		228,085
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(20,436)		(23,089)
Sales of Associates		47,091		63,218
Profit (loss) for the period of Associates		₩ 39,677		₩ 39,876
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%
Effective percentage of ownership	[3]	34.00%		34.00%
Acquisition cost		₩ 413,153		₩ 413,153
Book value
Beginning balance		670,896		647,010
Acquisition		0		0
Disposal		0		0
Dividends received		(11,620)		(11,468)
Share of income (loss)		15,965		26,300
Other comprehensive income (loss)		4,468		9,209
Others (book value)		(1)		(155)
Ending balance		679,708		670,896
Share in net assets		679,709		670,896
Total assets		7,427,157		6,758,957
Total liabilities		5,428,013		4,785,740
Net assets		1,999,144		1,973,217
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(1)		0
Sales of Associates		1,955,707		2,024,730
Profit (loss) for the period of Associates		₩ 64,077		₩ 95,435
Shareholders' agreements that may cause future economic resource or cash outflows		Gemeng International Energy Co., Ltd. issued put options on 8% of its shares to its financial investors, KEPCO Woori Sprott PEF (NPS Co-Pa PEF). If the investment fund is not collected until the maturity date (December 25, 2023, two years extension is possible), PEF can exercise the option at strike price which is the same as a principal investment price (including operating fees ratio of below 1% per annum), and also, the Company provided a performance guarantee on this agreement.		Gemeng International Energy Co., Ltd. issued put options on 8% of its shares to its financial investors, KEPCO Woori Sprott PEF (NPS Co-Pa PEF). If the investment fund is not collected until the maturity date (December 25, 2023, two years extension is possible), PEF can exercise the option at strike price which is the same as a principal investment price (including operating fees ratio of below 1% per annum), and also, the Group provided a performance guarantee on this agreement.
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%
Effective percentage of ownership	[3]	27.50%		27.50%
Acquisition cost		₩ 40,365		₩ 40,365
Book value
Beginning balance		123,425		108,628
Acquisition		0		0
Disposal		0		0
Dividends received		(9,782)
Share of income (loss)		11,330		11,079
Other comprehensive income (loss)		434		(65)
Others (book value)		(7,596)		3,783
Ending balance		117,811		123,425
Share in net assets		117,811		123,425
Total assets		730,020		852,457
Total liabilities		301,615		403,639
Net assets		428,405		448,818
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		246,014		277,370
Profit (loss) for the period of Associates		₩ 40,676		₩ 39,581
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%	[11]	14.63%	[12]
Effective percentage of ownership	[3]	14.63%		14.63%
Acquisition cost		₩ 12		₩ 12
Book value
Beginning balance		0		0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(22)		(27)
Other comprehensive income (loss)		671		(380)
Others (book value)		(649)		407
Ending balance		0		0
Share in net assets		(10,464)		(11,113)
Total assets		22,215		58,402
Total liabilities		93,736		134,361
Net assets		(71,521)		(75,959)
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		10,464		11,113
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ (142)		₩ (182)
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%	[11]	14.63%	[12]
Effective percentage of ownership	[3]	14.63%		14.63%
Acquisition cost		₩ 12		₩ 12
Book value
Beginning balance		0		0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(22)		(29)
Other comprehensive income (loss)		617		(349)
Others (book value)		(595)		378
Ending balance		0		0
Share in net assets		(9,618)		(10,213)
Total assets		23,999		54,275
Total liabilities		89,739		124,086
Net assets		(65,740)		(69,811)
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		9,618		10,213
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ (142)		₩ (180)
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%
Effective percentage of ownership	[3]	46.00%		46.00%
Acquisition cost		₩ 21,292		₩ 21,292
Book value
Beginning balance		29,355		31,097
Acquisition		0		0
Disposal		0		0
Dividends received		(1,303)		0
Share of income (loss)		3,245		(2,867)
Other comprehensive income (loss)		(1,639)		2
Others (book value)		(1,793)		1,123
Ending balance		27,865		29,355
Share in net assets		27,865		29,355
Total assets		199,841		222,266
Total liabilities		139,264		158,451
Net assets		60,577		63,815
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		20,265		18,165
Profit (loss) for the period of Associates		₩ 7,372		₩ (2,315)
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%
Effective percentage of ownership	[3]	20.00%		20.00%
Acquisition cost		₩ 615,860		₩ 615,860
Book value
Beginning balance		445,141		511,646
Acquisition		0		0
Disposal		0		0
Dividends received		(15,720)		(71,100)
Share of income (loss)		17,139		6,181
Other comprehensive income (loss)		(21,256)		(1,586)
Others (book value)		(70)		0
Ending balance		425,234		445,141
The fair value of associates		798,510		880,860
Share in net assets		149,949		136,012
Total assets		1,544,875		1,302,637
Total liabilities		795,131		622,576
Net assets		749,744		680,061
Investment differential		351,662		385,508
Intercompany transaction		0		0
Others (consolidated FS)		(76,377)		(76,379)
Sales of Associates		1,646,390		1,707,387
Profit (loss) for the period of Associates		₩ 219,406		₩ 252,855
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%
Effective percentage of ownership	[3]	49.00%		49.00%
Acquisition cost		₩ 132,300		₩ 132,300
Book value
Beginning balance		115,784		114,566
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(5,429)		1,218
Other comprehensive income (loss)		0		0
Others (book value)		(63)		0
Ending balance		110,292		115,784
Share in net assets		111,802		117,403
Total assets		782,561		805,622
Total liabilities		554,393		566,025
Net assets		228,168		239,597
Investment differential		0		0
Intercompany transaction		(1,510)		(1,619)
Others (consolidated FS)		0		0
Sales of Associates		421,519		576,554
Profit (loss) for the period of Associates		₩ (10,805)		₩ 2,319
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%
Effective percentage of ownership	[3]	38.50%		38.50%
Acquisition cost		₩ 49,831		₩ 49,831
Book value
Beginning balance		0		20,395
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		0		(20,784)
Other comprehensive income (loss)		0		389
Others (book value)		0		0
Ending balance		0		0
Share in net assets		(38,284)		(22,459)
Total assets		260,344		309,059
Total liabilities		359,790		367,399
Net assets		(99,446)		(58,340)
Investment differential		22,278		22,278
Intercompany transaction		0		0
Others (consolidated FS)		16,006		181
Sales of Associates		0		0
Profit (loss) for the period of Associates		(44,568)		(54,501)
Unrecognized equity interest		15,824		114
Accumulated unrecognized equity interest		₩ 15,938		₩ 114
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%
Effective percentage of ownership	[3]	40.00%		40.00%
Acquisition cost		₩ 461		₩ 461
Book value
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
Share in net assets		(175)		(186)
Total assets		556		592
Total liabilities		993		1,056
Net assets		(437)		(464)
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		175		186
Sales of Associates		0		0
Profit (loss) for the period of Associates		0		0
Unrecognized equity interest		(10)		6
Accumulated unrecognized equity interest		₩ 175		₩ 185
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%
Effective percentage of ownership	[3]	25.00%		25.00%
Acquisition cost		₩ 87,426		₩ 87,426
Book value
Beginning balance		72,935		77,165
Acquisition		0		3,052
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(2,896)		(10,210)
Other comprehensive income (loss)		(5,469)		2,928
Others (book value)		0		0
Ending balance		64,570		72,935
Share in net assets		65,665		74,026
Total assets		1,138,994		1,194,125
Total liabilities		876,336		898,023
Net assets		262,658		296,102
Investment differential		305		305
Intercompany transaction		(1,110)		(1,106)
Others (consolidated FS)		(290)		(290)
Sales of Associates		140,069		6,731
Profit (loss) for the period of Associates		₩ (11,318)		₩ (40,437)
Hadong Mineral Fiber Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Recycling fly ashes		Recycling fly ashes
Location		KOREA		KOREA
Percentage of ownership	[6]	8.33%		8.33%
Effective percentage of ownership	[3]	8.33%		8.33%
Acquisition cost		₩ 50		₩ 50
Book value
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
Share in net assets		(2)		(2)
Total assets		203		203
Total liabilities		231		231
Net assets		(28)		(28)
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		2		2
Sales of Associates		0		0
Profit (loss) for the period of Associates		0		0
Unrecognized equity interest				0
Accumulated unrecognized equity interest		₩ 2		₩ 2
Green Biomass Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		7.85%		7.85%	[13]
Effective percentage of ownership	[3]	7.85%		7.85%
Acquisition cost		₩ 0		₩ 714
Book value
Beginning balance		108		115
Acquisition		0		0
Disposal		(108)		0
Dividends received		0		0
Share of income (loss)		0		(73)
Other comprehensive income (loss)		0		0
Others (book value)		0		66
Ending balance		0		108
Share in net assets		0		108
Total assets		0		3,866
Total liabilities		0		2,487
Net assets		0		1,379
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		0		17
Profit (loss) for the period of Associates		₩ 0		₩ (925)
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%
Effective percentage of ownership	[3]	29.00%		29.00%
Acquisition cost		₩ 2,978		₩ 2,978
Book value
Beginning balance		1,438		365
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		459		1,031
Other comprehensive income (loss)		(117)		42
Others (book value)		0		0
Ending balance		1,780		1,438
Share in net assets		1,780		1,438
Total assets		23,061		26,109
Total liabilities		16,923		21,150
Net assets		6,138		4,959
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		7,946		11,196
Profit (loss) for the period of Associates		₩ 2,523		3,396
Unrecognized equity interest				0
Accumulated unrecognized equity interest				₩ 0
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	[14]	2.35%		2.35%
Effective percentage of ownership	[3]	25.54%		25.54%
Acquisition cost		₩ 686		₩ 686
Book value
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
Share in net assets		5,983		5,980
Total assets		24,024		26,625
Total liabilities		598		3,209
Net assets		23,426		23,416
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(5,983)		(5,980)
Sales of Associates		10,483		10,876
Profit (loss) for the period of Associates		23		1,946
Unrecognized equity interest		(3)		(497)
Accumulated unrecognized equity interest		₩ 785		₩ 788
Shareholders' agreements that may cause future economic resource or cash outflows		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.
Significant restrictions on its abilities		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.		Dividends can only be paid when all conditions of the shareholder's agreement are satisfied. Also, shares cannot be wholly or partially transferred without consent of the stakeholders is obtained.
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%
Effective percentage of ownership	[3]	29.00%		29.00%
Acquisition cost		₩ 1,740		₩ 1,740
Book value
Beginning balance		6,610		8,015
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(2,413)		(1,395)
Other comprehensive income (loss)		0		0
Others (book value)		0		(10)
Ending balance		4,197		6,610
Share in net assets		4,197		6,610
Total assets		116,929		137,370
Total liabilities		102,457		114,578
Net assets		14,472		22,792
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		27,486		36,435
Profit (loss) for the period of Associates		₩ (8,303)		₩ (4,810)
Naepo Green Energy Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		41.67%		41.67%
Effective percentage of ownership	[3]	41.67%		41.67%
Acquisition cost		₩ 0		₩ 29,200
Book value
Beginning balance		0		0
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(9,789)		0
Other comprehensive income (loss)		0		0
Others (book value)		9,789		0
Ending balance		0		0
Share in net assets		0		(9,281)
Total assets		0		77,070
Total liabilities		0		99,345
Net assets		0		(22,275)
Investment differential		0		2
Intercompany transaction		0		0
Others (consolidated FS)		0		9,279
Sales of Associates		0		6,572
Profit (loss) for the period of Associates		0		(31,577)
Unrecognized equity interest		(7,003)		9,281
Accumulated unrecognized equity interest		₩ 2,278		₩ 9,281
Significant restrictions on its abilities		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.		Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained.
Goseong Green Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[6]	1.12%		1.12%
Effective percentage of ownership	[3]	1.12%		1.12%
Acquisition cost		₩ 2,900		₩ 2,900
Book value
Beginning balance		2,340		2,459
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(154)		(119)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		2,186		2,340
Share in net assets		2,324		2,474
Total assets		4,559,480		3,399,058
Total liabilities		4,351,119		3,177,210
Net assets		208,361		221,848
Investment differential		0		0
Intercompany transaction		(138)		(134)
Others (consolidated FS)		0		0
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ (12,280)		₩ (10,276)
Gangneung Eco Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[6]	1.61%		1.61%
Effective percentage of ownership	[3]	1.61%		1.61%
Acquisition cost		₩ 2,900		₩ 2,900
Book value
Beginning balance		2,430		2,495
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(62)		(65)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		2,368		2,430
Share in net assets		2,496		2,553
Total assets		2,630,752		1,362,692
Total liabilities		2,475,848		1,204,202
Net assets		154,904		158,490
Investment differential		0		0
Intercompany transaction		(128)		(123)
Others (consolidated FS)		0		0
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ (3,623)		₩ (3,830)
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%
Effective percentage of ownership	[3]	40.00%		40.00%
Acquisition cost		₩ 72,000		₩ 72,000
Book value
Beginning balance		66,956		67,600
Acquisition		0
Disposal		0
Dividends received		0
Share of income (loss)		11,877		(827)
Other comprehensive income (loss)		(3,604)		198
Others (book value)		(5,638)		(15)
Ending balance		69,591		66,956
Share in net assets		82,512		69,712
Total assets		1,020,650		981,387
Total liabilities		814,369		807,107
Net assets		206,281		174,280
Investment differential		3,559		12,800
Intercompany transaction		(16,480)		(15,556)
Others (consolidated FS)		0		0
Sales of Associates		520,468		119,162
Profit (loss) for the period of Associates		₩ 32,002		₩ 11,847
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%
Effective percentage of ownership	[3]	28.00%		28.00%
Acquisition cost		₩ 194		₩ 194
Book value
Beginning balance		215		202
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(5)		13
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		210		215
Share in net assets		208		213
Total assets		2,001		2,483
Total liabilities		1,258		1,722
Net assets		743		761
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		2		2
Sales of Associates		387		454
Profit (loss) for the period of Associates		₩ (11)		₩ 47
Dongducheon Dream Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[15]	33.61%		33.61%
Effective percentage of ownership	[3]	34.01%		34.01%
Acquisition cost		₩ 148,105		₩ 148,105
Book value
Beginning balance		76,547		76,386
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		4,095		441
Other comprehensive income (loss)		0		0
Others (book value)		(5)		(280)
Ending balance		80,637		76,547
Share in net assets		94,791		91,060
Total assets		1,374,640		1,474,224
Total liabilities		1,095,926		1,206,478
Net assets		278,714		267,746
Investment differential		1,757		1,757
Intercompany transaction		(3,329)		(3,688)
Others (consolidated FS)		(12,582)		(12,582)
Sales of Associates		524,890		689,414
Profit (loss) for the period of Associates		₩ 10,982		₩ 2,849
Jinbhuvish Power Generation Pvt. Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		INDIA		INDIA
Percentage of ownership	[6]	5.16%		5.16%
Effective percentage of ownership	[3]	5.16%		5.16%
Acquisition cost		₩ 9,000	[16]	₩ 9,000	[17]
Book value
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
Share in net assets		2,403		2,625
Total assets		58,699		64,111
Total liabilities		12,122		13,240
Net assets		46,577		50,871
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(2,403)		(2,625)
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ 0		₩ 0
SE Green Energy Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		84.80%		84.80%
Effective percentage of ownership	[3]	84.80%		84.80%
Acquisition cost		₩ 0		₩ 0
Book value
Beginning balance		0		3,366
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		0		0
Other comprehensive income (loss)		0		(75)
Others (book value)		0		(3,291)
Ending balance		0		0
Share in net assets		0		0
Total assets		0		0
Total liabilities		0		0
Net assets		0		0
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
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]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		46.59%		49.90%	[18]
Effective percentage of ownership	[3]	46.59%		49.90%
Acquisition cost		₩ 5,190		₩ 5,190
Book value
Beginning balance		2,361
Acquisition		0
Disposal		0
Dividends received		0
Share of income (loss)		(411)
Other comprehensive income (loss)		0
Others (book value)		215		2,361
Ending balance		2,165		2,361
Share in net assets		2,165		2,361
Total assets		6,281		6,181
Total liabilities		1,634		1,450
Net assets		4,647		4,731
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ (810)		₩ (617)
Significant restrictions on its abilities		Before the commencement of the operation, shares cannot be wholly or partially transferred without the consent of the stakeholders.		Before the commencement of the operation, shares cannot be wholly or partially transferred without consent of the stakeholders is obtained.
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%	[18]
Effective percentage of ownership	[3]	34.00%		34.00%
Acquisition cost		₩ 204,000		₩ 204,000
Book value
Beginning balance		255,983		0
Acquisition		0		0
Disposal		0		0
Dividends received		(25,796)		0
Share of income (loss)		14,265		0
Other comprehensive income (loss)		0		0
Others (book value)		(26)		255,983
Ending balance		244,426		255,983
Share in net assets		244,426		255,983
Total assets		2,174,835		2,301,774
Total liabilities		1,455,935		1,548,883
Net assets		718,900		752,891
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		685,579		688,055
Profit (loss) for the period of Associates		₩ 41,955		₩ 75,842
Significant restrictions on its abilities		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.
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%
Effective percentage of ownership	[3]	29.00%		29.00%
Acquisition cost		₩ 1,230		₩ 1,230
Book value
Beginning balance		2,060		2,002
Acquisition		0		0
Disposal		0		0
Dividends received		(325)		(327)
Share of income (loss)		331		385
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		2,066		2,060
Share in net assets		2,066		2,060
Total assets		13,843		15,486
Total liabilities		6,718		8,385
Net assets		7,125		7,101
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		3,343		3,639
Profit (loss) for the period of Associates		₩ 1,149		₩ 1,442
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%
Effective percentage of ownership	[3]	29.00%		29.00%
Acquisition cost		₩ 5,243		₩ 5,243
Book value
Beginning balance		10,637		12,537
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(1,862)		(1,884)
Other comprehensive income (loss)		0		0
Others (book value)		3		(16)
Ending balance		8,778		10,637
Share in net assets		8,777		10,637
Total assets		170,261		173,537
Total liabilities		139,995		136,857
Net assets		30,266		36,680
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		1		0
Sales of Associates		40,241		52,256
Profit (loss) for the period of Associates		₩ (6,422)		₩ (6,496)
Gunsan Bio Energy Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[6]	18.87%		18.87%
Effective percentage of ownership	[3]	18.87%		18.87%
Acquisition cost		₩ 1,000		₩ 1,000
Book value
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
Share in net assets		(3,582)		(3,292)
Total assets		9,340		10,614
Total liabilities		28,322		28,062
Net assets		(18,982)		(17,448)
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		3,582		3,292
Sales of Associates		0		0
Profit (loss) for the period of Associates		(1,501)		(5,777)
Unrecognized equity interest		290		1,090
Accumulated unrecognized equity interest		₩ 3,582		₩ 3,292
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		28.00%		28.00%
Effective percentage of ownership	[3]	28.00%		28.00%
Acquisition cost		₩ 2,800		₩ 2,800
Book value
Beginning balance		1,063		1,593
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(491)		(515)
Other comprehensive income (loss)		0		0
Others (book value)		4		(15)
Ending balance		576		1,063
Share in net assets		576		1,063
Total assets		8,173		12,810
Total liabilities		6,116		9,013
Net assets		2,057		3,797
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		10,807		8,428
Profit (loss) for the period of Associates		₩ (1,756)		₩ (1,841)
Ulleungdo Natural Energy Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Renewable power generation		Renewable power generation
Location		KOREA		KOREA
Percentage of ownership		29.85%		29.85%
Effective percentage of ownership	[3]	29.85%		29.85%
Acquisition cost		₩ 0		₩ 0
Book value
Beginning balance		0		4,628
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		0		(1)
Other comprehensive income (loss)		0		0
Others (book value)		0		(4,627)
Ending balance		0		0
Share in net assets		0		0
Net assets		0		0
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		₩ 0		₩ 0
Korea Nuclear Partners Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Electric material agency		Electric material agency
Location		KOREA		KOREA
Percentage of ownership		28.98%		29.00%
Effective percentage of ownership	[3]	28.98%		29.00%
Acquisition cost		₩ 537		₩ 290
Book value
Beginning balance		0	[19]	175
Acquisition		247		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(43)		(79)
Other comprehensive income (loss)		(4)		0
Others (book value)		0		(96)
Ending balance		200		0	[19]
Share in net assets		361		160
Total assets		1,350		928
Total liabilities		105		375
Net assets		1,245		553
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(161)		(160)
Sales of Associates		1,062		1,441
Profit (loss) for the period of Associates		₩ (150)		₩ (50)
Tamra Offshore Wind Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		27.00%		27.00%
Effective percentage of ownership	[3]	27.00%		27.00%
Acquisition cost		₩ 0		₩ 0
Book value
Beginning balance		0		10,401
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		(10,401)
Ending balance		0		0
Share in net assets		0		0
Net assets		0		0
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		₩ 0		₩ 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	[20]	98.09%		98.09%
Effective percentage of ownership	[3]	98.09%		98.09%
Acquisition cost		₩ 51,500		₩ 51,500
Book value
Beginning balance		41,126		47,189
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(908)		(6,931)
Other comprehensive income (loss)		1,708		868
Others (book value)		0		0
Ending balance		41,926		41,126
Share in net assets		41,923		41,122
Total assets		42,988		42,162
Total liabilities		249		239
Net assets		42,739		41,923
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		3		4
Sales of Associates		82		127
Profit (loss) for the period of Associates		₩ (730)		₩ (5,430)
Energy Infra Asset Management Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Asset management		Asset management
Location		KOREA		KOREA
Percentage of ownership	[6]	9.90%		9.90%
Effective percentage of ownership	[3]	9.90%		9.90%
Acquisition cost		₩ 297		₩ 297
Book value
Beginning balance		791		665
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		147		126
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		938		791
Share in net assets		938		791
Total assets		10,424		8,712
Total liabilities		946		721
Net assets		9,478		7,991
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		5,130		5,118
Profit (loss) for the period of Associates		₩ 1,488		₩ 1,415
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%
Effective percentage of ownership	[3]	28.00%		28.00%
Acquisition cost		₩ 140		₩ 140
Book value
Beginning balance		13		17
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(1)		(4)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		12		13
Share in net assets		12		13
Total assets		368		371
Total liabilities		324		323
Net assets		44		48
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ (1)		₩ (14)
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%
Effective percentage of ownership	[3]	29.00%		29.00%
Acquisition cost		₩ 210		₩ 210
Book value
Beginning balance		516		460
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(62)		56
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		454		516
Share in net assets		453		514
Total assets		6,584		7,325
Total liabilities		5,022		5,551
Net assets		1,562		1,774
Investment differential		1		2
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		217		1,191
Profit (loss) for the period of Associates		₩ (212)		₩ 363
Nepal Water & Energy Development Company Private Limited
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	[21]	60.35%		57.76%
Effective percentage of ownership	[3]	58.59%		58.59%
Acquisition cost		₩ 50,268		₩ 35,571
Book value
Beginning balance		31,145		30,961
Acquisition		14,697		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(1,699)		(854)
Other comprehensive income (loss)		(1,466)		1,038
Others (book value)		0		0
Ending balance		42,677		31,145
Share in net assets		39,975		30,173
Total assets		109,321		78,309
Total liabilities		41,093		26,783
Net assets		68,228		51,526
Investment differential		971		972
Intercompany transaction		0		0
Others (consolidated FS)		1,731		0
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ (444)		₩ (1,380)
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%
Effective percentage of ownership	[3]	20.00%		20.00%
Acquisition cost		₩ 2,000		₩ 2,000
Book value
Beginning balance		948		1,206
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(22)		(258)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		926		948
Share in net assets		908		930
Total assets		28,634		28,816
Total liabilities		24,095		24,164
Net assets		4,539		4,652
Investment differential		18		18
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ (113)		₩ (1,007)
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%
Effective percentage of ownership	[3]	29.00%		29.00%
Acquisition cost		₩ 1,250		₩ 1,250
Book value
Beginning balance		1,144		1,020
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		5		124
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		1,149		1,144
Share in net assets		995		990
Total assets		38,997		40,941
Total liabilities		35,566		37,526
Net assets		3,431		3,415
Investment differential		154		154
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		5,129		6,908
Profit (loss) for the period of Associates		₩ (121)		₩ 1,665
Hyundai Ecoenergy Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[6]	19.00%		19.00%
Effective percentage of ownership	[3]	19.00%		19.00%
Acquisition cost		₩ 3,610		₩ 3,610
Book value
Beginning balance		3,781		3,388
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		469		393
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		4,250		3,781
Share in net assets		4,036		3,567
Total assets		195,040		209,395
Total liabilities		173,800		190,622
Net assets		21,240		18,773
Investment differential		214		214
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		24,166		13,343
Profit (loss) for the period of Associates		4,280		1,306
Unrecognized equity interest		(14,035)		12,890
Accumulated unrecognized equity interest		₩ 24,696		₩ 38,731
YeongGwang Yaksu Wind Electric Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[6]	9.63%		9.63%
Effective percentage of ownership	[3]	9.63%		9.63%
Acquisition cost		₩ 533		₩ 533
Book value
Beginning balance		386		533
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(74)		(147)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		312		386
Share in net assets		12		86
Total assets		43,039		46,488
Total liabilities		42,915		45,594
Net assets		124		894
Investment differential		300		300
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		5,802		6,511
Profit (loss) for the period of Associates		₩ (637)		₩ (1,510)
Shareholders' agreements that may cause future economic resource or cash outflows				As of December 31, 2019, YeongGwang Yaksu Wind Electric. Co., Ltd., an associate of the Group, which engages in the wind power generating business in YeongGwang, Jeonra-namdo, and entered into a project financing agreement with a limit of W46 billion with Hanhwa Life Insurance Co., Ltd. and others. The Group set the shares of YeongGwang Yaksu Wind Electric. Co., Ltd. as a collateral for the the project financing to the lenders.
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%
Effective percentage of ownership	[3]	29.00%		29.00%
Acquisition cost		₩ 1,189		₩ 1,189
Book value
Beginning balance		163
Acquisition		0		1,189
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(138)		(1,026)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		25		163
Share in net assets		(754)		(616)
Total assets		53,934		33,937
Total liabilities		56,533		36,060
Net assets		(2,599)		(2,123)
Investment differential		779		779
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ (920)		₩ (5,923)
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%
Effective percentage of ownership	[3]	20.00%		20.00%
Acquisition cost		₩ 300		₩ 300
Book value
Beginning balance		259
Acquisition		0		300
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(62)		(41)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		197		259
Share in net assets		197		253
Total assets		1,009		1,285
Total liabilities		25		18
Net assets		984		1,267
Investment differential		0		6
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		78		134
Profit (loss) for the period of Associates		₩ (280)		₩ (233)
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%
Effective percentage of ownership	[3]	20.00%		20.00%
Acquisition cost		₩ 50		₩ 50
Book value
Beginning balance		33
Acquisition		0		50
Disposal		0		0
Dividends received		0		0
Share of income (loss)		7		(17)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		40		33
Share in net assets		40		32
Total assets		418		376
Total liabilities		220		214
Net assets		198		162
Investment differential		1		1
Intercompany transaction		0		0
Others (consolidated FS)		(1)		0
Sales of Associates		153		167
Profit (loss) for the period of Associates		₩ (66)		₩ (88)
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%
Effective percentage of ownership	[3]	20.00%		20.00%
Acquisition cost		₩ 25		₩ 25
Book value
Beginning balance		21
Acquisition		0		25
Disposal		0		0
Dividends received		0		0
Share of income (loss)		6		(4)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		27		21
Share in net assets		(27)		(32)
Total assets		101		89
Total liabilities		234		249
Net assets		(133)		(160)
Investment differential		54		53
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		99		76
Profit (loss) for the period of Associates		₩ 27		₩ (72)
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%	[22]	15.00%	[23]
Effective percentage of ownership	[3]	15.00%		15.00%
Acquisition cost		₩ 969		₩ 969
Book value
Beginning balance		812
Acquisition		0		969
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(709)		(157)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		103		812
Share in net assets		83		793
Total assets		63,041		34,595
Total liabilities		62,488		29,310
Net assets		553		5,285
Investment differential		20		19
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		1,128		0
Profit (loss) for the period of Associates		₩ (4,655)		₩ (1,149)
Indeck Niles Development, LLC
Disclosure of associates [Line Items]
Key operation activities		Power generation		Power generation
Location		USA		USA
Percentage of ownership		24.08%	[24]	50.00%	[25]
Effective percentage of ownership	[3]	24.08%		50.00%
Acquisition cost		₩ 45,562		₩ 0
Book value
Beginning balance		0
Acquisition		45,562		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(13,344)		0
Other comprehensive income (loss)		(9,846)		0
Others (book value)		(1,745)		0
Ending balance		20,627		0
Share in net assets		8,017		24,646
Total assets		772,124		49,465
Total liabilities		738,826		174
Net assets		33,298		49,291
Investment differential		12,610		0
Intercompany transaction		0		0
Others (consolidated FS)		0		(24,646)
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ (29,392)		₩ (25,430)
Significant restrictions on its abilities		Shares cannot be wholly or partially transferred without the consent of the stakeholders.		Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained.
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%
Effective percentage of ownership	[3]	33.33%		33.33%
Acquisition cost		₩ 0		₩ 0
Book value
Beginning balance		87
Acquisition		0		0
Disposal		0		0
Dividends received		(539)		(245)
Share of income (loss)		559		333
Other comprehensive income (loss)		0		(1)
Others (book value)		(6)		0
Ending balance		101		87
Share in net assets		101		87
Total assets		314		271
Total liabilities		11		9
Net assets		303		262
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		2,272		1,513
Profit (loss) for the period of Associates		₩ 1,139		₩ 753
Significant restrictions on its abilities		Shares cannot be wholly or partially transferred without the consent of the stakeholders.		Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained.
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%
Effective percentage of ownership	[3]	49.00%		49.00%
Acquisition cost		₩ 7,300		₩ 7,105
Book value
Beginning balance		7,126
Acquisition		294		7,105
Disposal		(99)		0
Dividends received		(291)		0
Share of income (loss)		296		21
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		7,326		7,126
Share in net assets		7,326		7,126
Total assets		15,157		14,559
Total liabilities		206		15
Net assets		14,951		14,544
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		634		59
Profit (loss) for the period of Associates		₩ 603		₩ 44
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%
Effective percentage of ownership	[3]	33.11%		33.10%
Acquisition cost		₩ 798		₩ 798
Book value
Beginning balance		798
Acquisition		0		798
Disposal		0		0
Dividends received		0		0
Share of income (loss)		256		0
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		1,054		798
Share in net assets		651		662
Total assets		1,974		2,000
Total liabilities		8		0
Net assets		1,966		2,000
Investment differential		0		0
Intercompany transaction		267		0
Others (consolidated FS)		136		136
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ 0		₩ 0
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%
Effective percentage of ownership	[3]	29.00%		29.00%
Acquisition cost		₩ 287		₩ 287
Book value
Beginning balance		287
Acquisition		0		287
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		287		287
Share in net assets		287		285
Total assets		1,021		984
Total liabilities		32		0
Net assets		989		984
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		2
Sales of Associates		354		0
Profit (loss) for the period of Associates		₩ 5		₩ (6)
Significant restrictions on its abilities		Shares cannot be wholly or partially transferred without the consent of the stakeholders.		Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained.
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%		19.00%	[26]
Effective percentage of ownership	[3]	44.00%		19.00%
Acquisition cost		₩ 4,757		₩ 2,054
Book value
Beginning balance		2,054
Acquisition		2,703		2,054
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(75)		0
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		4,682		2,054
Share in net assets		4,367		1,976
Total assets		339,223		193,464
Total liabilities		329,298		183,063
Net assets		9,925		10,401
Investment differential		315		78
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		13,192		7,635
Profit (loss) for the period of Associates		₩ (329)		₩ (355)
Goduk Clean Energy Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Fuel cell generation		Fuel cell generation
Location		KOREA		KOREA
Percentage of ownership		61.00%	[27]	61.00%	[28]
Effective percentage of ownership	[3]	61.00%		61.00%
Acquisition cost		₩ 1,830		₩ 1,830
Book value
Beginning balance		1,830
Acquisition		0		1,830
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(843)		0
Other comprehensive income (loss)		(27)		0
Others (book value)		0		0
Ending balance		960		1,830
Share in net assets		960		1,830
Total assets		1,639		3,000
Total liabilities		65		0
Net assets		1,574		3,000
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of Associates		0		0
Profit (loss) for the period of Associates		₩ (1,382)		₩ 0
Energy Innovation Fund I
Disclosure of associates [Line Items]
Key operation activities		Holding company
Location		KOREA
Percentage of ownership		71.91%
Effective percentage of ownership	[3]	71.91%
Acquisition cost		₩ 0
Book value
Acquisition		4,000
Disposal		0
Dividends received		(2)
Share of income (loss)		(159)
Other comprehensive income (loss)		0
Others (book value)		(3,839)
Ending balance		0
Share in net assets		0
Total assets		0
Total liabilities		0
Net assets		0
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of Associates		0
Profit (loss) for the period of Associates		₩ 0
SureDataLab Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		R & D
Location		KOREA
Percentage of ownership		23.95%
Effective percentage of ownership	[3]	23.95%
Acquisition cost		₩ 126
Book value
Acquisition		126
Disposal		0
Dividends received		0
Share of income (loss)		(41)
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		85
Share in net assets		85
Total assets		400
Total liabilities		47
Net assets		353
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of Associates		303
Profit (loss) for the period of Associates		₩ (108)
SEP Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		R & D
Location		KOREA
Percentage of ownership		21.26%
Effective percentage of ownership	[3]	21.26%
Acquisition cost		₩ 27
Book value
Acquisition		27
Disposal		0
Dividends received		0
Share of income (loss)		(13)
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		14
Share in net assets		14
Total assets		164
Total liabilities		100
Net assets		64
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of Associates		0
Profit (loss) for the period of Associates		₩ (63)
Hankook Electric Power Information Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		R & D
Location		KOREA
Percentage of ownership		25.25%
Effective percentage of ownership	[3]	25.25%
Acquisition cost		₩ 38
Book value
Acquisition		38
Disposal		0
Dividends received		0
Share of income (loss)		101
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		139
Share in net assets		139
Total assets		1,163
Total liabilities		613
Net assets		550
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of Associates		1,208
Profit (loss) for the period of Associates		₩ 390
Tronix Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		R & D
Location		KOREA
Percentage of ownership		20.00%
Effective percentage of ownership	[3]	20.00%
Acquisition cost		₩ 75
Book value
Acquisition		75
Disposal		0
Dividends received		0
Share of income (loss)		44
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		119
Share in net assets		119
Total assets		942
Total liabilities		349
Net assets		593
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of Associates		2,030
Profit (loss) for the period of Associates		₩ (6)
O2&B Global Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		R & D
Location		KOREA
Percentage of ownership		20.00%
Effective percentage of ownership	[3]	20.00%
Acquisition cost		₩ 25
Book value
Acquisition		25
Disposal		0
Dividends received		0
Share of income (loss)		(3)
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		22
Share in net assets		22
Total assets		233
Total liabilities		125
Net assets		108
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of Associates		285
Profit (loss) for the period of Associates		₩ (57)
Muan Sunshine Solar Power Plant Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership		20.00%
Effective percentage of ownership	[3]	20.00%
Acquisition cost		₩ 1,570
Book value
Acquisition		79
Disposal		0
Dividends received		0
Share of income (loss)		(475)
Other comprehensive income (loss)		0
Others (book value)		1,492
Ending balance		1,096
Share in net assets		602
Total assets		147,908
Total liabilities		144,898
Net assets		3,010
Investment differential		494
Intercompany transaction		0
Others (consolidated FS)		0
Sales of Associates		6,017
Profit (loss) for the period of Associates		₩ (2,365)
Bigeum Resident Photovoltaic Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership		29.90%
Effective percentage of ownership	[3]	29.90%
Acquisition cost		₩ 1
Book value
Acquisition		0
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		0
Share in net assets		(116)
Total assets		11,164
Total liabilities		11,551
Net assets		(387)
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		116
Sales of Associates		0
Profit (loss) for the period of Associates		(309)
Unrecognized equity interest		116
Accumulated unrecognized equity interest		₩ 116
Jeju SolarOne Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership	[29]	10.00%
Effective percentage of ownership	[3]	10.00%
Acquisition cost		₩ 161
Book value
Acquisition		161
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		(2)
Others (book value)		0
Ending balance		159
Share in net assets		159
Total assets		1,608
Total liabilities		14
Net assets		1,594
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of Associates		0
Profit (loss) for the period of Associates		₩ (4)
Goesan Solar Park Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership		29.00%
Effective percentage of ownership	[3]	29.00%
Acquisition cost		₩ 1,276
Book value
Acquisition		1,276
Disposal		0
Dividends received		0
Share of income (loss)		408
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		1,684
Share in net assets		1,684
Total assets		56,332
Total liabilities		50,524
Net assets		5,808
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of Associates		2,809
Profit (loss) for the period of Associates		₩ (262)
Saemangeum Heemang Photovoltaic Co.,Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership		35.00%
Effective percentage of ownership	[3]	35.00%
Acquisition cost		₩ 11,022
Book value
Acquisition		11,022
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		11,022
Share in net assets		10,282
Total assets		35,447
Total liabilities		6,070
Net assets		29,377
Investment differential		740
Intercompany transaction		0
Others (consolidated FS)		0
Sales of Associates		0
Profit (loss) for the period of Associates		₩ (1,943)
Bitgoel Eco Energy Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership		29.00%
Effective percentage of ownership	[3]	29.00%
Acquisition cost		₩ 29
Book value
Acquisition		29
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		29
Share in net assets		29
Total assets		100
Total liabilities		0
Net assets		100
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of Associates		0
Profit (loss) for the period of Associates		₩ 0
Jeju Gimnyeong Wind Power Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership		30.00%
Effective percentage of ownership	[3]	30.00%
Acquisition cost		₩ 714
Book value
Acquisition		714
Disposal		0
Dividends received		0
Share of income (loss)		864
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		1,578
Share in net assets		1,578
Total assets		72,557
Total liabilities		67,297
Net assets		5,260
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of Associates		0
Profit (loss) for the period of Associates		₩ 0
Seoroseoro Sunny Power Plant Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership	[30]	19.46%
Effective percentage of ownership	[3]	19.46%
Acquisition cost		₩ 230
Book value
Acquisition		230
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		230
Share in net assets		230
Total assets		1,182
Total liabilities		0
Net assets		1,182
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of Associates		0
Profit (loss) for the period of Associates		₩ 0
Muan Solar Park Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership	[30]	19.00%
Effective percentage of ownership	[3]	19.00%
Acquisition cost		₩ 4,180
Book value
Acquisition		4,180
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		4,180
Share in net assets		3,871
Total assets		245,431
Total liabilities		225,057
Net assets		20,374
Investment differential		309
Intercompany transaction		0
Others (consolidated FS)		0
Sales of Associates		14,359
Profit (loss) for the period of Associates		₩ (966)
YuDang Solar Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership		20.00%
Effective percentage of ownership	[3]	20.00%
Acquisition cost		₩ 360
Book value
Acquisition		360
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		360
Share in net assets		497
Total assets		23,360
Total liabilities		20,876
Net assets		2,484
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		(137)
Sales of Associates		1,611
Profit (loss) for the period of Associates		₩ 686
Anjwa Smart Farm & Solar City Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership	[30]	19.50%
Effective percentage of ownership	[3]	19.50%
Acquisition cost		₩ 5,510
Book value
Acquisition		5,510
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		5,510
Share in net assets		4,714
Total assets		295,570
Total liabilities		271,396
Net assets		24,174
Investment differential		796
Intercompany transaction		0
Others (consolidated FS)		0
Sales of Associates		1,900
Profit (loss) for the period of Associates		₩ (1,684)
Daewon Green Energy Co., Ltd.
Disclosure of associates [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership		25.36%
Effective percentage of ownership	[3]	25.36%
Acquisition cost		₩ 3,910
Book value
Acquisition		3,910
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		3,910
Share in net assets		3,866
Total assets		15,370
Total liabilities		122
Net assets		15,248
Investment differential		44
Intercompany transaction		0
Others (consolidated FS)		0
Sales of Associates		0
Profit (loss) for the period of Associates		₩ (93)
[1]	The effective percentage of ownership is 22.02% considering treasury stocks.
[2]	The effective percentage of ownership is 21.57% considering treasury stocks.
[3]	The percentage of ownership shown above is after considering the treasury stocks and others.
[4]	The loss for the year ended December 31, 2020 is reduced by the associate entity's net income (loss) attributable to non-controlling interests.
[5]	The profit recognized for the years ended December 31, 2019 is reduced by the associate entity's net income attributable to non-controlling interests.
[6]	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.
[7]	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.
[8]	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. The Company can exercise significant influence by virtue of right to nominate directors to the board of directors of the entity.
[9]	As of December 31, 2019, 15.64% of ownership of Hyundai Energy Co., Ltd. is held by NH Power ll Co., Ltd. and NH Bank. According to the shareholders' agreement reached on March 2011, not only does the Company have a call option to acquire the investment in Hyundai Energy Co., Ltd. from NH Power ll Co., Ltd. and NH Bank with a certain rate of return, NH Power ll Co., Ltd. and NH Bank also have put options to dispose of their investment to the Company. In connection with this agreement, the Company applied the equity method on the investment in Hyundai Energy Co., Ltd. with 46.30% of ownership.
[10]	The Company recognized an 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.
[11]	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.
[12]	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 influence on the entity.
[13]	The effective percentage of ownership is less than 20% but the Company can exercise significant influence by virtue of its contractual right to appoint a director to the board of directors of the entity and the fact that the dominant portion of the investee's sales transactions is generated from the Company.
[14]	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.
[15]	The effective percentage of ownership is 34.01% considering the conversion of redeemable convertible preferred stock into ordinary stock.
[16]	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
[17]	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 is no business activities occurring.
[18]	Daejung Offshore Wind Power Co., Ltd. and GS Donghae Electric Power Co., Ltd. are reclassified from joint ventures to associates, and Jeongam Wind Power Co., Ltd. and Korea Power Engineering Service Co., Ltd. are reclassified from associates to joint ventures during the year ended December 31, 2019.
[19]	It was determined that there is objective evidence of impairment due to prolonged operating losses. As a result, the Company recognized an impairment loss of KRW96 million in impairment loss on investments in associates and joint ventures for the year ended December 31, 2019.
[20]	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.
[21]	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.
[22]	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.
[23]	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. Accordingly, the entities are classified as an associate.
[24]	According to the shareholders' agreement, additional investment of 50% of total stake is agreed by March 2022
[25]	Although the investment amount is not paid as of December 31, 2019, the Company has an investment agreement on 50% of the interests. the Company can exercise significant influence by virtue of its contractual right to appoint a director to the board of directors of the entity.
[26]	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.
[27]	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.
[28]	Even though the effective percentage of ownership is more than 50%, the Company does not hold control over the entity according to its proportion to make decisions, which is less than 50%. 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.
[29]	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.
[30]	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.

Investments in Joint Ventures (

Investments in Joint Ventures (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019
Disclosure of joint ventures [Line Items]
Acquisition cost		₩ 1,943,392		₩ 1,504,710
Book value [Abstract]
Beginning balance		1,663,029		1,813,525
Acquisition		289,068		90,162
Disposal		0		(5,359)
Dividends received		(139,519)		(79,601)
Share of income (loss)		220,032		129,402
Other comprehensive income (loss)		(113,377)		(22,189)
Others (book value)		513		(262,911)
Ending balance		₩ 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	[1]	52.80%		52.80%
Effective percentage of ownership	[2]	50.80%		50.80%
Acquisition cost		₩ 11,355		₩ 11,355
Book value [Abstract]
Beginning balance		134		188
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(34)		(54)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		100		134
Share in net assets		100		134
Total assets		208		270
Total liabilities		11		7
Net assets		197		263
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		0		0
Profit (loss) for the period of JointVentures		₩ (66)		₩ (107)
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%
Effective percentage of ownership	[2]	49.00%		49.00%
Acquisition cost		₩ 44,405		₩ 44,405
Book value [Abstract]
Beginning balance		18,318		27,251
Acquisition		0		0
Disposal		0		0
Dividends received		(4,337)		(2,176)
Share of income (loss)		5,919		5,288
Other comprehensive income (loss)		(6,636)		(12,045)
Others (book value)		0		0
Ending balance		13,264		18,318
Share in net assets		13,264		18,318
Total assets		27,073		37,389
Total liabilities		4		5
Net assets		27,069		37,384
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		0		0
Profit (loss) for the period of JointVentures		₩ 12,080		₩ (159)
Shuweihat Asia Operation & Maintenance Company
Disclosure of joint ventures [Line Items]
Key operation activities		Maintenance of utility plant		Maintenance of utility plant
Location		CAYMAN		CAYMAN
Percentage of ownership	[1]	55.00%		55.00%
Effective percentage of ownership	[2]	55.00%		55.00%
Acquisition cost		₩ 30		₩ 30
Book value [Abstract]
Beginning balance		1,408		792
Acquisition		0		0
Disposal		0		0
Dividends received		(922)		(907)
Share of income (loss)		1,074		1,040
Other comprehensive income (loss)		(503)		(1)
Others (book value)		0		484
Ending balance		1,057		1,408
Share in net assets		1,057		1,408
Total assets		1,960		2,605
Total liabilities		38		45
Net assets		1,922		2,560
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		2,689		2,570
Profit (loss) for the period of JointVentures		₩ 1,953		₩ 1,892
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%		33.48%
Effective percentage of ownership	[2]	33.10%		33.41%
Acquisition cost		₩ 26,602		₩ 26,602
Book value [Abstract]
Beginning balance		20,562		19,032
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		4		22
Other comprehensive income (loss)		(769)		1,508
Others (book value)		0		0
Ending balance		19,797		20,562
Share in net assets		19,797		20,562
Total assets		59,885		61,548
Total liabilities		77		4
Net assets		59,808		61,544
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		0		0
Profit (loss) for the period of JointVentures		₩ 0		₩ 0
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%
Effective percentage of ownership	[2]	50.00%		50.00%
Acquisition cost		₩ 16,101		₩ 16,101
Book value [Abstract]
Beginning balance		19,376		21,379
Acquisition		0		0
Disposal		0		0
Dividends received		(4,206)		(4,760)
Share of income (loss)		2,575		2,442
Other comprehensive income (loss)		455		315
Others (book value)		0		0
Ending balance		18,200		19,376
Share in net assets		18,200		19,376
Total assets		80,261		78,191
Total liabilities		43,861		39,439
Net assets		36,400		38,752
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		13,355		13,200
Profit (loss) for the period of JointVentures		₩ 5,150		₩ 4,894
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%
Effective percentage of ownership	[2]	50.00%		50.00%
Acquisition cost		₩ 15,595		₩ 15,595
Book value [Abstract]
Beginning balance		16,248		15,209
Acquisition		0		0
Disposal		0		0
Dividends received		(1,981)		0
Share of income (loss)		1,051		963
Other comprehensive income (loss)		612		76
Others (book value)		0		0
Ending balance		15,930		16,248
Share in net assets		15,930		16,248
Total assets		67,232		66,821
Total liabilities		35,372		34,325
Net assets		31,860		32,496
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		8,381		8,384
Profit (loss) for the period of JointVentures		₩ 2,102		₩ 1,914
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%
Effective percentage of ownership	[2]	40.00%		40.00%
Acquisition cost		₩ 2,103		₩ 2,103
Book value [Abstract]
Beginning balance		2,441		1,918
Acquisition		0		0
Disposal		0		0
Dividends received		(617)		(372)
Share of income (loss)		580		751
Other comprehensive income (loss)		1		144
Others (book value)		0		0
Ending balance		2,405		2,441
Share in net assets		2,405		2,441
Total assets		6,013		6,101
Total liabilities		0		0
Net assets		6,013		6,101
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		27		25
Profit (loss) for the period of JointVentures		₩ 1,449		₩ 1,876
KEPCO SPC Power Corporation
Disclosure of joint ventures [Line Items]
Key operation activities		Construction and operation of utility plant		Construction and operation of utility plant
Location		PHILIPPINES		PHILIPPINES
Percentage of ownership	[1]	75.20%		75.20%
Effective percentage of ownership	[2]	75.20%		75.20%
Acquisition cost		₩ 94,579		₩ 94,579
Book value [Abstract]
Beginning balance		214,794		208,306
Acquisition		0		0
Disposal		0		0
Dividends received		(48,486)		(45,349)
Share of income (loss)		48,479		48,043
Other comprehensive income (loss)		(12,995)		3,781
Others (book value)		(129)		13
Ending balance		201,663		214,794
Share in net assets		201,663		214,794
Total assets		289,271		308,274
Total liabilities		21,102		22,643
Net assets		268,169		285,631
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		184,481		187,867
Profit (loss) for the period of JointVentures		₩ 66,311		₩ 64,152
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%
Effective percentage of ownership	[2]	40.00%		40.00%
Acquisition cost		₩ 16,621		₩ 16,621
Book value [Abstract]
Beginning balance		8,149		9,981
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(1,718)		(2,050)
Other comprehensive income (loss)		99		218
Others (book value)		0		0
Ending balance		6,530		8,149
Share in net assets		6,530		8,149
Total assets		69,668		77,313
Total liabilities		53,343		56,941
Net assets		16,325		20,372
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		7,157		6,106
Profit (loss) for the period of JointVentures		₩ (4,295)		₩ (5,175)
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%
Effective percentage of ownership	[2]	40.00%		40.00%
Acquisition cost		₩ 121,928		₩ 121,928
Book value [Abstract]
Beginning balance		185,307		166,162
Acquisition		0		0
Disposal		0		0
Dividends received		(13,453)		0
Share of income (loss)		15,317		16,325
Other comprehensive income (loss)		1,307		2,820
Others (book value)		0		0
Ending balance		188,478		185,307
Share in net assets		188,478		185,307
Total assets		747,990		765,598
Total liabilities		276,796		302,329
Net assets		471,194		463,269
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		119,955		122,398
Profit (loss) for the period of JointVentures		₩ 39,439		₩ 40,371
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%
Effective percentage of ownership	[2]	40.00%		40.00%
Acquisition cost		₩ 39,872		₩ 39,872
Book value [Abstract]
Beginning balance		41,024		39,442
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		1,231		875
Other comprehensive income (loss)		275		707
Others (book value)		0		0
Ending balance		42,530		41,024
Share in net assets		42,530		41,024
Total assets		182,342		189,157
Total liabilities		76,018		86,596
Net assets		106,324		102,561
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		26,378		23,910
Profit (loss) for the period of JointVentures		₩ 2,914		₩ 2,188
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%
Effective percentage of ownership	[2]	40.00%		40.00%
Acquisition cost		₩ 109,743		₩ 109,743
Book value [Abstract]
Beginning balance		109,096		105,328
Acquisition		0		0
Disposal		0		0
Dividends received		(14,956)		0
Share of income (loss)		25,474		4,355
Other comprehensive income (loss)		(22,458)		(1,734)
Others (book value)		1		1,147
Ending balance		97,157		109,096
Share in net assets		158,472		175,349
Total assets		2,294,880		2,538,719
Total liabilities		1,898,701		2,100,347
Net assets		396,179		438,372
Investment differential		0		0
Intercompany transaction		(60,511)		(65,450)
Others (consolidated FS)		(804)		(803)
Sales of JointVentures		293,722		208,514
Profit (loss) for the period of JointVentures		₩ 94,927		₩ 1,567
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%
Effective percentage of ownership	[2]	40.00%		40.00%
Acquisition cost		₩ 70		₩ 70
Book value [Abstract]
Beginning balance		6,879		5,834
Acquisition		0		0
Disposal		0		0
Dividends received		(5,340)		(2,222)
Share of income (loss)		2,788		3,070
Other comprehensive income (loss)		(514)		197
Others (book value)		0		0
Ending balance		3,813		6,879
Share in net assets		3,813		6,879
Total assets		28,666		36,121
Total liabilities		19,133		18,923
Net assets		9,533		17,198
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		26,268		23,777
Profit (loss) for the period of JointVentures		₩ 7,318		₩ 7,203
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%
Effective percentage of ownership	[2]	40.00%		40.00%
Acquisition cost		₩ 301,910		₩ 301,910
Book value [Abstract]
Beginning balance		253,607		239,632
Acquisition		0		0
Disposal		0		0
Dividends received		(4,352)		(4,631)
Share of income (loss)		24,669		10,166
Other comprehensive income (loss)		(10,891)		8,440
Others (book value)		3,188		0
Ending balance		266,221		253,607
Share in net assets		254,798		240,976
Total assets		1,664,412		1,543,049
Total liabilities		1,027,418		940,609
Net assets		636,994		602,440
Investment differential		29,357		(80,161)
Intercompany transaction		0		0
Others (consolidated FS)		(17,934)		92,792
Sales of JointVentures		1,042,422		1,035,399
Profit (loss) for the period of JointVentures		₩ 35,916		₩ 32,828
Significant restrictions on its abilities		Dividends can only be paid when all conditions of the loan agreement are satisfied and prior written consent of financial institutions is obtained.
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%
Effective percentage of ownership	[2]	45.00%		45.00%
Acquisition cost		₩ 833		₩ 833
Book value [Abstract]
Beginning balance		9,052		7,708
Acquisition		0		0
Disposal		0		0
Dividends received		(833)		(208)
Share of income (loss)		2,952		1,552
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		11,171		9,052
Share in net assets		11,348		9,228
Total assets		44,571		31,326
Total liabilities		19,354		10,820
Net assets		25,217		20,506
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(177)		(176)
Sales of JointVentures		19,762		11,305
Profit (loss) for the period of JointVentures		₩ 7,262		₩ 3,837
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%
Effective percentage of ownership	[2]	25.00%		25.00%
Acquisition cost		₩ 2,100		₩ 2,100
Book value [Abstract]
Beginning balance		5,045		4,761
Acquisition		0		0
Disposal		0		0
Dividends received		(330)		(430)
Share of income (loss)		663		714
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		5,378		5,045
Share in net assets		5,378		5,045
Total assets		39,266		42,318
Total liabilities		17,754		22,137
Net assets		21,512		20,181
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		7,296		7,843
Profit (loss) for the period of JointVentures		₩ 2,652		₩ 2,856
Significant restrictions on its abilities		Dividends can only be paid when all conditions of the loan agreement are satisfied or prior written consent of financial institutions is obtained.
GS Donghae Electric Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities				Power generation
Location				KOREA
Percentage of ownership				0.00%
Effective percentage of ownership	[2]			0.00%
Acquisition cost				₩ 0
Book value [Abstract]
Beginning balance		₩ 0		240,591
Acquisition				0
Disposal				0
Dividends received				(10,200)
Share of income (loss)				25,787
Other comprehensive income (loss)				0
Others (book value)				(256,178)
Ending balance				0
Share in net assets				0
Total assets				0
Total liabilities				0
Net assets				0
Investment differential				0
Intercompany transaction				0
Others (consolidated FS)				0
Sales of JointVentures				0
Profit (loss) for the period of JointVentures				₩ 0
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%	[3]	29.00%
Effective percentage of ownership	[2]	29.00%		29.00%
Acquisition cost		₩ 290		₩ 290
Book value [Abstract]
Beginning balance		571		515
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(25)		56
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		546		571
Share in net assets		546		571
Total assets		2,319		2,993
Total liabilities		435		1,025
Net assets		1,884		1,968
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		4,105		3,323
Profit (loss) for the period of JointVentures		₩ (96)		₩ 134
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%	[3]	29.00%
Effective percentage of ownership	[2]	29.00%		29.00%
Acquisition cost		₩ 1,856		₩ 1,856
Book value [Abstract]
Beginning balance		2,883		2,676
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		13		207
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		2,896		2,883
Share in net assets		2,896		2,883
Total assets		14,801		17,653
Total liabilities		4,816		7,712
Net assets		9,985		9,941
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		2,298		2,991
Profit (loss) for the period of JointVentures		₩ 144		709
Daejung Offshore Wind Power Co., Ltd.
Book value [Abstract]
Beginning balance				2,669
Share of income (loss)				(308)
Others (book value)				₩ (2,361)
Amman Asia Electric Power Company
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		JORDAN		JORDAN
Percentage of ownership	[1]	60.00%		60.00%
Effective percentage of ownership	[2]	60.00%		60.00%
Acquisition cost		₩ 111,476		₩ 111,476
Book value [Abstract]
Beginning balance		192,164		177,357
Acquisition		0		0
Disposal		0		0
Dividends received		(28,281)		0
Share of income (loss)		20,165		20,648
Other comprehensive income (loss)		(22,795)		(5,841)
Others (book value)		0		0
Ending balance		161,253		192,164
Share in net assets		161,253		192,164
Total assets		725,101		821,997
Total liabilities		456,346		501,723
Net assets		268,755		320,274
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		20,586		23,866
Profit (loss) for the period of JointVentures		₩ 33,608		₩ 34,424
KAPES, Inc.
Disclosure of joint ventures [Line Items]
Key operation activities		R & D		R&D
Location		KOREA		KOREA
Percentage of ownership	[1]	51.00%		51.00%
Effective percentage of ownership	[2]	51.00%		51.00%
Acquisition cost		₩ 5,629		₩ 5,629
Book value [Abstract]
Beginning balance		10,832		9,079
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(10,806)		1,767
Other comprehensive income (loss)		0		0
Others (book value)		(26)		(14)
Ending balance		0		10,832
Share in net assets		16,369		10,832
Total assets		127,418		124,396
Total liabilities		95,322		103,158
Net assets		32,096		21,238
Investment differential		0		0
Intercompany transaction		(19,567)		0
Others (consolidated FS)		3,198		0
Sales of JointVentures		167,201		93,831
Profit (loss) for the period of JointVentures		10,908		₩ 3,465
Unrecognized equity interest		3,198
Accumulated unrecognized equity interest		3,198
Dangjin Eco Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities				Power generation
Location				KOREA
Book value [Abstract]
Beginning balance		₩ 0		₩ 19,912
Acquisition				0
Disposal				(5,359)
Dividends received				0
Share of income (loss)				(657)
Other comprehensive income (loss)				16
Others (book value)				(13,912)
Ending balance				0
Share in net assets				0
Total assets				0
Total liabilities				0
Net assets				0
Investment differential				0
Intercompany transaction				0
Others (consolidated FS)				0
Sales of JointVentures				0
Profit (loss) for the period of JointVentures				₩ 0
Honam Wind Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		29.00%		29.00%
Effective percentage of ownership	[2]	29.00%		29.00%
Acquisition cost		₩ 3,480		₩ 3,480
Book value [Abstract]
Beginning balance		4,375		4,860
Acquisition		0		0
Disposal		0		0
Dividends received		(435)		(587)
Share of income (loss)		(53)		102
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		3,887		4,375
Share in net assets		3,855		4,343
Total assets		36,237		39,680
Total liabilities		22,945		24,703
Net assets		13,292		14,977
Investment differential		32		32
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		4,433		5,365
Profit (loss) for the period of JointVentures		₩ (220)		₩ 354
Significant restrictions on its abilities		Dividends can only be paid when all conditions of the loan agreement are satisfied.
Jeongam Wind Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		40.00%		40.00%	[4]
Effective percentage of ownership	[2]	40.00%		40.00%
Acquisition cost		₩ 5,580		₩ 5,580
Book value [Abstract]
Beginning balance		4,437
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		183		0
Other comprehensive income (loss)		0		0
Others (book value)		0		4,437
Ending balance		4,620		4,437
Share in net assets		4,620		4,437
Total assets		89,829		94,134
Total liabilities		78,279		83,041
Net assets		11,550		11,093
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		9,757		11,644
Profit (loss) for the period of JointVentures		₩ 412		₩ 2,005
Shareholders' agreements that may cause future economic resource or cash outflows		In the case where non-controlling shareholders decide to dispose of their shares in Jeongam Wind Power Co., Ltd. after the construction of the power plant has been completed, the Company is obligated to acquire those shares at fair value.
Significant restrictions on its abilities		Dividends can only be paid when all conditions of the loan agreement are satisfied and reimbursement to the lender can be restricted depending on the priority of the loans. Also, Shares cannot be wholly or partially transferred without the consent of the stakeholders.
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%	[4]
Effective percentage of ownership	[2]	29.00%		29.00%
Acquisition cost		₩ 290		₩ 290
Book value [Abstract]
Beginning balance		4,902
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		446		0
Other comprehensive income (loss)		0		0
Others (book value)		14		4,902
Ending balance		5,362		4,902
Share in net assets		5,362		4,902
Total assets		24,162		19,052
Total liabilities		5,674		2,150
Net assets		18,488		16,902
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		9,435		12,284
Profit (loss) for the period of JointVentures		₩ 1,538		₩ 1,749
Significant restrictions on its abilities		Shares cannot be wholly or partially transferred without the consent of the board of directors.
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%
Effective percentage of ownership	[2]	29.90%		29.90%
Acquisition cost		₩ 52,700		₩ 52,700
Book value [Abstract]
Beginning balance		34,872	[5]	42,505
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(7,354)		(7,385)
Other comprehensive income (loss)		0		0
Others (book value)		0		(248)
Ending balance		27,518		34,872	[5]
Share in net assets		27,762		35,117
Total assets		605,493		607,823
Total liabilities		512,642		490,375
Net assets		92,851		117,448
Investment differential		3		0
Intercompany transaction		0		0
Others (consolidated FS)		(247)		(245)
Sales of JointVentures		222,066		313,438
Profit (loss) for the period of JointVentures		₩ (24,597)		₩ (24,490)
Significant restrictions on its abilities		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.
Yeonggwangbaeksu Wind Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[3]	15.00%		15.00%
Effective percentage of ownership	[2]	15.00%		15.00%
Acquisition cost		₩ 3,000		₩ 3,000
Book value [Abstract]
Beginning balance		3,040		2,843
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		84		197
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		3,124		3,040
Share in net assets		3,119		3,035
Total assets		90,758		99,552
Total liabilities		69,967		79,322
Net assets		20,791		20,230
Investment differential		5		5
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		11,232		11,739
Profit (loss) for the period of JointVentures		₩ 572		₩ 1,342
Significant restrictions on its abilities		Dividends and settlement amount for renewable energy supply 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.
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%
Effective percentage of ownership	[2]	50.00%		50.00%
Acquisition cost		₩ 2,781		₩ 2,781
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
Share in net assets		(133,280)		(102,825)
Total assets		2,207,764		1,589,928
Total liabilities		2,474,324		1,795,578
Net assets		(266,560)		(205,650)
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		133,280		102,825
Sales of JointVentures		819,706		1,008,326
Profit (loss) for the period of JointVentures		108,832		71,803
Unrecognized equity interest		30,456		61,165
Accumulated unrecognized equity interest		₩ 133,280		₩ 102,824
Kelar S.A
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		CHILE		CHILE
Percentage of ownership	[1]	65.00%		65.00%
Effective percentage of ownership	[2]	65.00%		65.00%
Acquisition cost		₩ 78,060		₩ 78,060
Book value [Abstract]
Beginning balance		70,462		72,824
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		14,864		3,435
Other comprehensive income (loss)		(9,186)		(8,416)
Others (book value)		(4,691)		2,619
Ending balance		71,449		70,462
Share in net assets		68,941		67,794
Total assets		598,901		634,633
Total liabilities		492,838		530,335
Net assets		106,063		104,298
Investment differential		2,508		2,668
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		93,375		86,702
Profit (loss) for the period of JointVentures		₩ 16,863		₩ 8,867
Significant restrictions on its abilities		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.		Dividends can only be paid when all conditions of the loan agreement are satisfied. Also, Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained
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%
Effective percentage of ownership	[2]	35.00%		35.00%
Acquisition cost		₩ 26,892		₩ 26,892
Book value [Abstract]
Beginning balance		34,327		7,081
Acquisition		0		26,146
Disposal		0		0
Dividends received		0		0
Share of income (loss)		7,522		5,601
Other comprehensive income (loss)		(9,220)		(4,489)
Others (book value)		434		(12)
Ending balance		33,063		34,327
Share in net assets		33,063		34,327
Total assets		645,152		654,365
Total liabilities		550,687		556,287
Net assets		94,465		98,078
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		90,255		109,825
Profit (loss) for the period of JointVentures		₩ 20,487		₩ 16,489
Significant restrictions on its abilities		Dividends can only be paid when all conditions of the loan agreement are satisfied.
Incheon New Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[6]	29.00%		29.00%
Effective percentage of ownership	[2]	29.00%		29.00%
Acquisition cost		₩ 461		₩ 461
Book value [Abstract]
Beginning balance		0	[7]	579
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		0		(232)
Other comprehensive income (loss)		0		0
Others (book value)		0		(347)
Ending balance		0		0	[7]
Share in net assets		152		347
Total assets		3,439		4,749
Total liabilities		2,914		3,553
Net assets		525		1,196
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(152)		(347)
Sales of JointVentures		1,519		1,951
Profit (loss) for the period of JointVentures		(670)		₩ (800)
Unrecognized equity interest		194
Accumulated unrecognized equity interest		₩ 194
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%
Effective percentage of ownership	[2]	29.00%		29.00%
Acquisition cost		₩ 15,370		₩ 15,370
Book value [Abstract]
Beginning balance		17,342		16,751
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(2,528)		591
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		14,814		17,342
Share in net assets		14,814		17,342
Total assets		227,539		242,332
Total liabilities		176,457		182,533
Net assets		51,082		59,799
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		33,677		44,733
Profit (loss) for the period of JointVentures		₩ (8,734)		₩ 2,606
Significant restrictions on its abilities		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.
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%
Effective percentage of ownership	[2]	50.00%		50.00%
Acquisition cost		₩ 7,493		₩ 3,191
Book value [Abstract]
Beginning balance		1,757		1,632
Acquisition		4,302		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(626)		66
Other comprehensive income (loss)		(5,433)		59
Others (book value)		0		0
Ending balance		0		1,757
Share in net assets		(3,855)		1,757
Total assets		98,544		89,904
Total liabilities		106,254		86,390
Net assets		(7,710)		3,514
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		3,855		0
Sales of JointVentures		0		0
Profit (loss) for the period of JointVentures		(765)		(767)
Unrecognized equity interest		3,855		0
Accumulated unrecognized equity interest		₩ 3,855		₩ 0
Significant restrictions on its abilities		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.		Dividends can only be paid when all conditions of the loan agreement are satisfied. Also, Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained.
Barakah One Company
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		UAE		UAE
Percentage of ownership		18.00%	[8]	18.00%	[9]
Effective percentage of ownership	[2]	18.00%		18.00%
Acquisition cost		₩ 118		₩ 118
Book value [Abstract]
Beginning balance		0		3,807
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		0		(2,668)
Other comprehensive income (loss)		0		(1,139)
Others (book value)		0		0
Ending balance		0		0
Share in net assets		(41,493)		(38,842)
Total assets		24,693,571		24,330,632
Total liabilities		24,924,087		24,546,421
Net assets		(230,516)		(215,789)
Investment differential		0		0
Intercompany transaction		(27,845)		(77,254)
Others (consolidated FS)		69,338		116,096
Sales of JointVentures		0		0
Profit (loss) for the period of JointVentures		(4,520)		(112,114)
Unrecognized equity interest		(46,758)		116,096
Accumulated unrecognized equity interest		₩ 69,338		₩ 116,096
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%	[8]	18.00%	[9]
Effective percentage of ownership	[2]	18.00%		18.00%
Acquisition cost		₩ 296		₩ 296
Book value [Abstract]
Beginning balance		285		274
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		2		0
Other comprehensive income (loss)		(17)		11
Others (book value)		0		0
Ending balance		270		285
Share in net assets		270		285
Total assets		139,286		120,987
Total liabilities		137,788		119,405
Net assets		1,498		1,582
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		0		0
Profit (loss) for the period of JointVentures		₩ 12		₩ 3
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%
Effective percentage of ownership	[2]	33.33%		33.33%
Acquisition cost		₩ 1		₩ 1
Book value [Abstract]
Beginning balance		553		582
Acquisition		0		0
Disposal		0		0
Dividends received		(404)		(411)
Share of income (loss)		399		380
Other comprehensive income (loss)		17		2
Others (book value)		0		0
Ending balance		565		553
Share in net assets		565		553
Total assets		10,772		8,904
Total liabilities		9,076		7,245
Net assets		1,696		1,659
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		31,161		21,171
Profit (loss) for the period of JointVentures		₩ 1,122		₩ 1,099
Daegu Green Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership	[10]	29.00%		29.00%
Effective percentage of ownership	[2]	54.24%		54.24%
Acquisition cost		₩ 46,225		₩ 46,225
Book value [Abstract]
Beginning balance		22,824	[11]	41,110
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		128		3,599
Other comprehensive income (loss)		0		0
Others (book value)		93		(21,885)
Ending balance		23,045		22,824	[11]
Share in net assets		43,342		43,124
Total assets		549,034		579,593
Total liabilities		469,126		500,092
Net assets		79,908		79,501
Investment differential		84		84
Intercompany transaction		0		0
Others (consolidated FS)		(20,381)		(20,384)
Sales of JointVentures		221,382		301,339
Profit (loss) for the period of JointVentures		₩ 290		₩ 4,899
Shareholders' agreements that may cause future economic resource or cash outflows		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.		The Group has a right to purchase all the shares of Daegu Green Power Co., Ltd. held by the financial investores at the yield-based transfer amount agreed with the shareholders.The Group can exercise its right 5, 10 and 13 years after the date of the investment. The Group 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
Significant restrictions on its abilities		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.		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 is obtained.
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%
Effective percentage of ownership	[2]	46.00%		46.00%
Acquisition cost		₩ 17,475		₩ 17,475
Book value [Abstract]
Beginning balance		17,627		15,304
Acquisition		0		2,100
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(371)		223
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		17,256		17,627
Share in net assets		16,764		17,135
Total assets		249,999		262,610
Total liabilities		213,556		225,361
Net assets		36,443		37,249
Investment differential		492		492
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		26,535		24,256
Profit (loss) for the period of JointVentures		₩ 1,690		₩ (2,032)
Shareholders' agreements that may cause future economic resource or cash outflows		In case the Company intends to purchase all or part of the shares from Daehan Green Energy Co., Ltd., which is a non-controlling shareholder, Daehan Green Energy Co., Ltd. has an obligation to evaluate the shares at fair value and transfer them to the Company.		In case the Group intends to purchase all or part of the shares from Daehan Green Energy Co., Ltd., which is a non-controlling shareholder, Daehan Green Energy Co., Ltd. has an obligation to evaluate the shares at fair value and transfer them to the Group.
Significant restrictions on its abilities		Dividends and settlement amount for renewable energy supply certificate can only be paid when all conditions of the loan agreement are satisfied and prior written consent of financial institutions is obtained.
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%
Effective percentage of ownership	[2]	45.00%		45.00%
Acquisition cost		₩ 1,700		₩ 1,700
Book value [Abstract]
Beginning balance		672		1,851
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		389		(1,746)
Other comprehensive income (loss)		80		(55)
Others (book value)		(77)		622
Ending balance		1,064		672
Share in net assets		1,009		614
Total assets		14,232		13,443
Total liabilities		11,990		12,079
Net assets		2,242		1,364
Investment differential		55		58
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		1,688		1,590
Profit (loss) for the period of JointVentures		₩ 485		₩ (1,057)
Shareholders' agreements that may cause future economic resource or cash outflows		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.		According to the shareholders' agreement, the Group has an obligation to purchase the shares at the agreed yield-based transfer price on the agreed date of exercise.According to the shareholders' agreement, when Sprott Chile SolarISpA intends to sell its shares
Significant restrictions on its abilities		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.		Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained.
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%
Effective percentage of ownership	[2]	45.00%		45.00%
Acquisition cost		₩ 525		₩ 525
Book value [Abstract]
Beginning balance		146		474
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		135		(619)
Other comprehensive income (loss)		17		(6)
Others (book value)		(21)		297
Ending balance		277		146
Share in net assets		162		23
Total assets		4,674		4,677
Total liabilities		4,313		4,625
Net assets		361		52
Investment differential		115		123
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		588		519
Profit (loss) for the period of JointVentures		₩ 150		₩ (402)
Shareholders' agreements that may cause future economic resource or cash outflows		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.		According to the shareholders' agreement, the Group has an obligation to purchase the shares at the agreed yield-based transfer price on the agreed date of exercise.According to the shareholders' agreement, when Sprott Chile SolarISpA intends to sell its shares.
Significant restrictions on its abilities		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.		Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained
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%
Effective percentage of ownership	[2]	45.00%		45.00%
Acquisition cost		₩ 2,091		₩ 2,091
Book value [Abstract]
Beginning balance		1,035		1,663
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		455		(1,014)
Other comprehensive income (loss)		107		(86)
Others (book value)		(107)		472
Ending balance		1,490		1,035
Share in net assets		1,399		937
Total assets		17,916		18,984
Total liabilities		14,808		16,901
Net assets		3,108		2,083
Investment differential		91		98
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		1,824		1,954
Profit (loss) for the period of JointVentures		₩ 535		₩ (1,104)
Shareholders' agreements that may cause future economic resource or cash outflows		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.		According to the shareholders' agreement, the Group has an obligation to purchase the shares at the agreed yield-based transfer price on the agreed date of exercise.According to the shareholders' agreement, when Sprott Chile SolarISpA intends to sell its shares.
Significant restrictions on its abilities		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.		Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained.
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%
Effective percentage of ownership	[2]	20.00%		20.00%
Acquisition cost		₩ 20,521		₩ 20,521
Book value [Abstract]
Beginning balance		13,863		16,124
Acquisition		0		4,290
Disposal		0		0
Dividends received		0		0
Share of income (loss)		20,468		(7,131)
Other comprehensive income (loss)		(2,432)		580
Others (book value)		(2)		0
Ending balance		31,897		13,863
Share in net assets		31,899		13,863
Total assets		405,804		364,347
Total liabilities		246,310		295,029
Net assets		159,494		69,318
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(2)		0
Sales of JointVentures		209,596		7,224
Profit (loss) for the period of JointVentures		₩ 12,208		₩ (35,650)
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%
Effective percentage of ownership	[2]	35.00%		35.00%
Acquisition cost		₩ 17,850		₩ 17,850
Book value [Abstract]
Beginning balance		17,182		17,433
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		5,371		(251)
Other comprehensive income (loss)		0		0
Others (book value)		(1)		0
Ending balance		22,552		17,182
Share in net assets		22,552		17,182
Total assets		275,911		232,170
Total liabilities		211,476		183,079
Net assets		64,435		49,091
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		62,286		0
Profit (loss) for the period of JointVentures		₩ 15,346		₩ (717)
Significant restrictions on its abilities		Dividends and settlement amount for renewable energy supply certificate can only be paid when all conditions of the loan agreement are satisfied and prior written consent of financial institutions is obtained.
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%
Effective percentage of ownership	[2]	50.00%		50.00%
Acquisition cost		₩ 42,948		₩ 42,948
Book value [Abstract]
Beginning balance		42,070		51,094
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		33,072		(6,525)
Other comprehensive income (loss)		(6,333)		(2,500)
Others (book value)		0		1
Ending balance		68,809		42,070
Share in net assets		68,809		42,070
Total assets		320,908		331,862
Total liabilities		183,290		247,722
Net assets		137,618		84,140
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		19,659		18,744
Profit (loss) for the period of JointVentures		₩ 13,247		₩ (345)
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%
Effective percentage of ownership	[2]	50.00%		50.00%
Acquisition cost		₩ 27,891		₩ 27,891
Book value [Abstract]
Beginning balance		31,156		38,898
Acquisition		0		0
Disposal		0		0
Dividends received		(1,246)		(939)
Share of income (loss)		24,466		(5,507)
Other comprehensive income (loss)		(4,737)		(1,296)
Others (book value)		0		0
Ending balance		49,639		31,156
Share in net assets		49,639		31,156
Total assets		236,565		246,571
Total liabilities		137,287		184,258
Net assets		99,278		62,313
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		12,410		12,207
Profit (loss) for the period of JointVentures		₩ 8,821		₩ (1,912)
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%
Effective percentage of ownership	[2]	50.00%		50.00%
Acquisition cost		₩ 28,021		₩ 28,021
Book value [Abstract]
Beginning balance		42,916		41,415
Acquisition		0		0
Disposal		0		0
Dividends received		(872)		(1,152)
Share of income (loss)		(35,735)		4,609
Other comprehensive income (loss)		(1,843)		(1,957)
Others (book value)		0		1
Ending balance		4,466		42,916
Share in net assets		53,736		42,916
Total assets		194,643		209,850
Total liabilities		87,171		124,017
Net assets		107,472		85,833
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		(49,270)		0
Sales of JointVentures		10,679		10,384
Profit (loss) for the period of JointVentures		₩ (722)		₩ 7,630
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%
Effective percentage of ownership	[2]	50.00%		50.00%
Acquisition cost		₩ 5,188		₩ 5,188
Book value [Abstract]
Beginning balance		5,602		5,410
Acquisition		0		0
Disposal		0		0
Dividends received		(249)		(430)
Share of income (loss)		210		430
Other comprehensive income (loss)		(333)		192
Others (book value)		0		0
Ending balance		5,230		5,602
Share in net assets		5,230		5,602
Total assets		10,733		11,422
Total liabilities		274		217
Net assets		10,459		11,205
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		664		656
Profit (loss) for the period of JointVentures		₩ 541		₩ 651
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%
Effective percentage of ownership	[2]	50.00%		50.00%
Acquisition cost		₩ 2,187		₩ 2,187
Book value [Abstract]
Beginning balance		1,966		1,898
Acquisition		0		0
Disposal		0		0
Dividends received		(95)		(194)
Share of income (loss)		95		172
Other comprehensive income (loss)		(119)		90
Others (book value)		0		0
Ending balance		1,847		1,966
Share in net assets		1,847		1,966
Total assets		3,776		4,019
Total liabilities		82		87
Net assets		3,694		3,932
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		266		262
Profit (loss) for the period of JointVentures		₩ 223		₩ 260
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%
Effective percentage of ownership	[2]	45.00%		45.00%
Acquisition cost		₩ 1,222		₩ 1,222
Book value [Abstract]
Beginning balance		595		921
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		498		(665)
Other comprehensive income (loss)		80		(82)
Others (book value)		(81)		421
Ending balance		1,092		595
Share in net assets		915		406
Total assets		13,529		12,979
Total liabilities		11,496		12,076
Net assets		2,033		903
Investment differential		177		189
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		1,704		961
Profit (loss) for the period of JointVentures		₩ 702		₩ (1,130)
Shareholders' agreements that may cause future economic resource or cash outflows		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.		According to the shareholders' agreement, the Group has an obligation to purchase the shares at the agreed yield-based transfer price on the agreed date of exercise.According to the shareholders' agreement, when Sprott Chile SolarISpA intends to sell its shares
Significant restrictions on its abilities		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.		Shares cannot be wholly or partially transferred without consent of the stakeholders is obtained.
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	[3]	12.37%		12.37%
Effective percentage of ownership	[2]	12.37%		12.37%
Acquisition cost		₩ 4,095		₩ 4,095
Book value [Abstract]
Beginning balance		4,024		3,940
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(24)		(28)
Other comprehensive income (loss)		129		112
Others (book value)		0		0
Ending balance		4,129		4,024
Share in net assets		4,121		4,015
Total assets		33,930		32,883
Total liabilities		618		425
Net assets		33,312		32,458
Investment differential		8		9
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		0		0
Profit (loss) for the period of JointVentures		₩ (191)		₩ (232)
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%
Effective percentage of ownership	[2]	50.00%		50.00%
Acquisition cost		₩ 37,689		₩ 37,689
Book value [Abstract]
Beginning balance		34,859		36,865
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		187		842
Other comprehensive income (loss)		(163)		(2,849)
Others (book value)		0		1
Ending balance		34,883		34,859
Share in net assets		34,883		34,859
Total assets		74,776		69,903
Total liabilities		5,011		186
Net assets		69,765		69,717
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		4,390		591
Profit (loss) for the period of JointVentures		₩ 1,476		₩ 1,686
Taebaek Gadeoksan Wind Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		47.31%		37.78%
Effective percentage of ownership	[2]	47.31%		37.78%
Acquisition cost		₩ 12,570		₩ 8,500
Book value [Abstract]
Beginning balance		7,846		8,508
Acquisition		4,070		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		1,468		(651)
Other comprehensive income (loss)		(22)		(9)
Others (book value)		0		(2)
Ending balance		13,362		7,846
Share in net assets		13,362		7,846
Total assets		142,731		70,270
Total liabilities		114,487		49,500
Net assets		28,244		20,770
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		10,587		0
Profit (loss) for the period of JointVentures		₩ 2,411		₩ (1,602)
Significant restrictions on its abilities		Dividends and settlement amount for renewable energy supply 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 written consent of financial institutions is obtained.
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%
Effective percentage of ownership	[2]	29.01%		29.01%
Acquisition cost		₩ 3,200		₩ 3,200
Book value [Abstract]
Beginning balance		3,043		2,073
Acquisition		0		1,127
Disposal		0		0
Dividends received		0		0
Share of income (loss)		409		(153)
Other comprehensive income (loss)		0		(4)
Others (book value)		1		0
Ending balance		3,453		3,043
Share in net assets		3,391		2,982
Total assets		55,460		51,247
Total liabilities		43,771		40,969
Net assets		11,689		10,278
Investment differential		61		61
Intercompany transaction		0		0
Others (consolidated FS)		1		0
Sales of JointVentures		7,411		0
Profit (loss) for the period of JointVentures		₩ 2,039		₩ (549)
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%
Effective percentage of ownership	[2]	45.00%		45.00%
Acquisition cost		₩ 1,181		₩ 1,181
Book value [Abstract]
Beginning balance		1,157		1,181
Acquisition		0		0
Disposal		0		0
Dividends received		0		0
Share of income (loss)		472		(112)
Other comprehensive income (loss)		107		(79)
Others (book value)		(115)		167
Ending balance		1,621		1,157
Share in net assets		1,387		908
Total assets		12,795		7,859
Total liabilities		9,713		5,842
Net assets		3,082		2,017
Investment differential		234		249
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		1,111		0
Profit (loss) for the period of JointVentures		₩ 824		₩ (204)
Shareholders' agreements that may cause future economic resource or cash outflows		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.		According to the shareholders' agreement, the Group has an obligation to purchase the shares at the agreed yield-based transfer price on the agreed date of exercise.According to the shareholders' agreement, when Sprott Chile SolarISpA intends to sell its shares.
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%
Effective percentage of ownership	[2]	38.00%		38.00%
Acquisition cost		₩ 47,903		₩ 47,903
Book value [Abstract]
Beginning balance		48,930		47,903
Acquisition		0		0
Disposal		0		0
Dividends received		(6,439)		(4,633)
Share of income (loss)		6,745		4,305
Other comprehensive income (loss)		(219)		1,355
Others (book value)		0		0
Ending balance		49,017		48,930
Share in net assets		19,323		19,236
Total assets		97,947		98,577
Total liabilities		47,098		47,956
Net assets		50,849		50,621
Investment differential		29,694		29,694
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		23,182		18,720
Profit (loss) for the period of JointVentures		₩ 15,249		₩ 11,331
Saemangeum Solar Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation		Power generation
Location		KOREA		KOREA
Percentage of ownership		81.00%	[12]	81.00%	[13]
Effective percentage of ownership	[2]	81.00%		81.00%
Acquisition cost		₩ 26,399		₩ 10,000
Book value [Abstract]
Beginning balance		8,324
Acquisition		16,399		10,000
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(431)		(1,676)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		24,292		8,324
Share in net assets		24,450		8,481
Total assets		34,363		13,740
Total liabilities		4,180		3,270
Net assets		30,183		10,470
Investment differential		(158)		0
Intercompany transaction		0		0
Others (consolidated FS)		0		(157)
Sales of JointVentures		0		0
Profit (loss) for the period of JointVentures		₩ (532)		₩ (1,875)
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%	[3]	29.00%
Effective percentage of ownership	[2]	29.00%		29.00%
Acquisition cost		₩ 2,900		₩ 2,900
Book value [Abstract]
Beginning balance		2,764
Acquisition		0		2,900
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(232)		(136)
Other comprehensive income (loss)		1,592		0
Others (book value)		0		0
Ending balance		4,124		2,764
Share in net assets		2,342		982
Total assets		64,341		27,659
Total liabilities		56,264		24,272
Net assets		8,077		3,387
Investment differential		1,782		1,782
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		0		0
Profit (loss) for the period of JointVentures		₩ (1,206)		₩ (1,365)
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%	[3]	29.00%
Effective percentage of ownership	[2]	29.00%		29.00%
Acquisition cost		₩ 2,494		₩ 2,494
Book value [Abstract]
Beginning balance		2,198
Acquisition		0		2,494
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(3)		(296)
Other comprehensive income (loss)		0		0
Others (book value)		0		0
Ending balance		2,195		2,198
Share in net assets		2,195		2,198
Total assets		63,940		31,402
Total liabilities		56,371		23,823
Net assets		7,569		7,579
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		0		0
Profit (loss) for the period of JointVentures		₩ (645)		₩ (844)
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%
Effective percentage of ownership	[2]	49.00%		49.00%
Acquisition cost		₩ 8,364		₩ 8,364
Book value [Abstract]
Beginning balance		8,665
Acquisition		0		8,364
Disposal		0		0
Dividends received		0		0
Share of income (loss)		506		647
Other comprehensive income (loss)		572		(346)
Others (book value)		(1,556)		0
Ending balance		8,187		8,665
Share in net assets		(3,237)		6,854
Total assets		48,327		64,959
Total liabilities		54,934		50,971
Net assets		(6,607)		13,988
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		11,424		1,811
Sales of JointVentures		3,789		1,254
Profit (loss) for the period of JointVentures		₩ (21,087)		₩ (2,645)
Significant restrictions on its abilities		Dividends can only be paid when all conditions of the loan agreement are satisfied.
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%	[14]
Effective percentage of ownership	[2]	34.00%		34.00%
Acquisition cost		₩ 25,661		₩ 25,661
Book value [Abstract]
Beginning balance		25,661
Acquisition		0		9,180
Disposal		0		0
Dividends received		0		0
Share of income (loss)		96		0
Other comprehensive income (loss)		(237)		0
Others (book value)		3		16,481
Ending balance		25,523		25,661
Share in net assets		25,182		25,320
Total assets		97,834		99,907
Total liabilities		23,769		25,436
Net assets		74,065		74,471
Investment differential		341		341
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		3,953		107
Profit (loss) for the period of JointVentures		₩ 565		₩ (737)
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%
Effective percentage of ownership	[2]	49.00%		49.00%
Acquisition cost		₩ 2,940		₩ 2,940
Book value [Abstract]
Beginning balance		2,940
Acquisition		0		2,940
Disposal		0		0
Dividends received		0		0
Share of income (loss)		140		0
Other comprehensive income (loss)		(15)		0
Others (book value)		0		0
Ending balance		3,065		2,940
Share in net assets		3,065		2,940
Total assets		19,041		7,237
Total liabilities		12,786		1,237
Net assets		6,255		6,000
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		1,188		0
Profit (loss) for the period of JointVentures		₩ 286		₩ 0
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%		99.54%	[15]
Effective percentage of ownership	[2]	50.00%		99.54%
Acquisition cost		₩ 10,800		₩ 10,800
Book value [Abstract]
Beginning balance		10,800
Acquisition		0		10,800
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(286)		0
Other comprehensive income (loss)		(29)		0
Others (book value)		0		0
Ending balance		10,485		10,800
Share in net assets		10,442		10,714
Total assets		20,917		10,764
Total liabilities		33		0
Net assets		20,884		10,764
Investment differential		43		86
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		0		0
Profit (loss) for the period of JointVentures		₩ (572)		₩ (11)
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%	[16]	14.95%	[17]
Effective percentage of ownership	[2]	14.95%		14.95%
Acquisition cost		₩ 5,068		₩ 3,403
Book value [Abstract]
Beginning balance		3,403
Acquisition		1,665		3,403
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(1,985)		0
Other comprehensive income (loss)		311		0
Others (book value)		0		0
Ending balance		3,394		3,403
Share in net assets		(186)		308
Total assets		181,432		10,566
Total liabilities		182,674		8,503
Net assets		(1,242)		2,063
Investment differential		3,580		3,095
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		0		0
Profit (loss) for the period of JointVentures		₩ (13,285)		₩ (7)
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%	[16]	14.95%	[17]
Effective percentage of ownership	[2]	14.95%		14.95%
Acquisition cost		₩ 3,678		₩ 672
Book value [Abstract]
Beginning balance		672
Acquisition		3,006		672
Disposal		0		0
Dividends received		0		0
Share of income (loss)		36		0
Other comprehensive income (loss)		(54)		0
Others (book value)		0		0
Ending balance		3,660		672
Share in net assets		1,489		144
Total assets		81,257		3,848
Total liabilities		71,295		2,885
Net assets		9,962		963
Investment differential		2,171		528
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		0		0
Profit (loss) for the period of JointVentures		₩ 243		₩ 22
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%	[16]	14.95%	[17]
Effective percentage of ownership	[2]	14.95%		14.95%
Acquisition cost		₩ 307		₩ 222
Book value [Abstract]
Beginning balance		222
Acquisition		85		222
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(46)		0
Other comprehensive income (loss)		(21)		0
Others (book value)		0		0
Ending balance		240		222
Share in net assets		236		149
Total assets		7,781		3,170
Total liabilities		6,204		2,171
Net assets		1,577		999
Investment differential		4		73
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		0		0
Profit (loss) for the period of JointVentures		₩ (309)		₩ 13
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%
Effective percentage of ownership	[2]	20.00%		20.00%
Acquisition cost		₩ 8,829		₩ 5,524
Book value [Abstract]
Beginning balance		5,625
Acquisition		3,305		5,524
Disposal		0		0
Dividends received		0		0
Share of income (loss)		(156)		(4)
Other comprehensive income (loss)		346		122
Others (book value)		157		(17)
Ending balance		9,277		5,625
Share in net assets		9,277		5,625
Total assets		46,394		28,141
Total liabilities		9		13
Net assets		46,385		28,128
Investment differential		0		0
Intercompany transaction		0		0
Others (consolidated FS)		0		0
Sales of JointVentures		0		0
Profit (loss) for the period of JointVentures		₩ (782)		₩ (18)
Solaseado Solar Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership		38.90%
Effective percentage of ownership	[2]	38.90%
Acquisition cost		₩ 7,020
Book value [Abstract]
Acquisition		7,020
Disposal		0
Dividends received		0
Share of income (loss)		2,895
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		9,915
Share in net assets		8,554
Total assets		349,855
Total liabilities		327,865
Net assets		21,990
Investment differential		1,361
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		43,782
Profit (loss) for the period of JointVentures		₩ 7,443
Yeongam Solar Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership	[3]	19.00%
Effective percentage of ownership	[2]	19.00%
Acquisition cost		₩ 6,460
Book value [Abstract]
Acquisition		6,460
Disposal		0
Dividends received		0
Share of income (loss)		(418)
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		6,042
Share in net assets		5,269
Total assets		312,960
Total liabilities		285,231
Net assets		27,729
Investment differential		773
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		17,347
Profit (loss) for the period of JointVentures		₩ (3,324)
Samsu Wind Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership	[3]	19.00%
Effective percentage of ownership	[2]	19.00%
Acquisition cost		₩ 2,637
Book value [Abstract]
Acquisition		2,637
Disposal		0
Dividends received		0
Share of income (loss)		(30)
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		2,607
Share in net assets		2,607
Total assets		59,597
Total liabilities		45,877
Net assets		13,720
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		0
Profit (loss) for the period of JointVentures		₩ 243
Pulau Indah Power Plant Sdn. Bhd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation
Location		MALAYSIA
Percentage of ownership		25.00%
Effective percentage of ownership	[2]	25.00%
Acquisition cost		₩ 11,569
Book value [Abstract]
Acquisition		11,569
Disposal		0
Dividends received		0
Share of income (loss)		(144)
Other comprehensive income (loss)		(221)
Others (book value)		0
Ending balance		11,204
Share in net assets		5,561
Total assets		31,538
Total liabilities		9,293
Net assets		22,245
Investment differential		5,643
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		0
Profit (loss) for the period of JointVentures		₩ (894)
Sam-Yang Photovoltaic Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership		49.00%
Effective percentage of ownership	[2]	49.00%
Acquisition cost		₩ 5,245
Book value [Abstract]
Acquisition		5,245
Disposal		0
Dividends received		0
Share of income (loss)		290
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		5,535
Share in net assets		5,535
Total assets		55,345
Total liabilities		44,049
Net assets		11,296
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		2,769
Profit (loss) for the period of JointVentures		₩ 592
NH-Amundi Global Infrastructure Investment Private Investment Trust 21
Disclosure of joint ventures [Line Items]
Key operation activities		Holding company
Location		KOREA
Percentage of ownership		29.53%
Effective percentage of ownership	[2]	29.53%
Acquisition cost		₩ 20,952
Book value [Abstract]
Acquisition		20,952
Disposal		0
Dividends received		(1,388)
Share of income (loss)		2,678
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		22,242
Share in net assets		21,715
Total assets		73,573
Total liabilities		39
Net assets		73,534
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		527
Sales of JointVentures		1,770
Profit (loss) for the period of JointVentures		₩ 8,989
Shin-han BNPP Private Investment Trust for East-West Sunlight Dream
Disclosure of joint ventures [Line Items]
Key operation activities		Holding company
Location		KOREA
Percentage of ownership		90.00%
Effective percentage of ownership	[2]	90.00%
Acquisition cost		₩ 15,699
Book value [Abstract]
Acquisition		15,699
Disposal		0
Dividends received		0
Share of income (loss)		430
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		16,129
Share in net assets		16,129
Total assets		17,932
Total liabilities		11
Net assets		17,921
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		6
Profit (loss) for the period of JointVentures		₩ 478
PT Barito Wahana Tenaga
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation
Location		INDONESIA
Percentage of ownership		30.61%
Effective percentage of ownership	[2]	30.61%
Acquisition cost		₩ 59,395
Book value [Abstract]
Acquisition		59,395
Disposal		0
Dividends received		0
Share of income (loss)		4,923
Other comprehensive income (loss)		(1,289)
Others (book value)		0
Ending balance		63,029
Share in net assets		63,029
Total assets		205,894
Total liabilities		0
Net assets		205,894
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		0
Profit (loss) for the period of JointVentures		₩ 28,631
Cheongna Energy Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Generating and distributing vapor and hot/cold water
Location		KOREA
Percentage of ownership	[12],[18]	50.10%
Effective percentage of ownership	[2]	50.10%
Acquisition cost		₩ 49,344
Book value [Abstract]
Acquisition		0
Disposal		0
Dividends received		0
Share of income (loss)		21
Other comprehensive income (loss)		0
Others (book value)		4,919
Ending balance		4,940
Share in net assets		2,877
Total assets		341,478
Total liabilities		335,736
Net assets		5,742
Investment differential		3,137
Intercompany transaction		(1,074)
Others (consolidated FS)		0
Sales of JointVentures		78,387
Profit (loss) for the period of JointVentures		₩ 5,995
Naepo Green Energy Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership	[19]	29.20%
Effective percentage of ownership	[2]	29.20%
Acquisition cost		₩ 29,200
Book value [Abstract]
Acquisition		0
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		0
Share in net assets		(2,278)
Total assets		152,003
Total liabilities		159,805
Net assets		(7,802)
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		2,278
Sales of JointVentures		7,056
Profit (loss) for the period of JointVentures		₩ (28,043)
DAYONE Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.)
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership	[20]	30.66%
Effective percentage of ownership	[2]	46.30%
Acquisition cost		₩ 71,070
Book value [Abstract]
Acquisition		0
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		0
Share in net assets		(25,224)
Total assets		441,875
Total liabilities		496,355
Net assets		(54,480)
Investment differential		0
Intercompany transaction		(923)
Others (consolidated FS)		26,147
Sales of JointVentures		93,832
Profit (loss) for the period of JointVentures		₩ 30,269
OneEnergy Asia Limited
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation
Location		VIETNAM
Percentage of ownership		40.00%
Effective percentage of ownership	[2]	40.00%
Acquisition cost		₩ 56,654
Book value [Abstract]
Acquisition		56,654
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		56,654
Share in net assets		31,142
Total assets		78,005
Total liabilities		150
Net assets		77,855
Investment differential		25,512
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		0
Profit (loss) for the period of JointVentures		₩ (578)
KAS INVESTMENT I LLC
Disclosure of joint ventures [Line Items]
Key operation activities		Holding company
Location		USA
Percentage of ownership	[21]	29.89%
Effective percentage of ownership	[2]	29.89%
Acquisition cost		₩ 23,437
Book value [Abstract]
Acquisition		23,437
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		23,437
Share in net assets		23,437
Total assets		78,410
Total liabilities		0
Net assets		78,410
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		0
Profit (loss) for the period of JointVentures		₩ 0
KAS INVESTMENT II LLC
Disclosure of joint ventures [Line Items]
Key operation activities		Holding company
Location		USA
Percentage of ownership	[21]	29.89%
Effective percentage of ownership	[2]	29.89%
Acquisition cost		₩ 23,343
Book value [Abstract]
Acquisition		23,343
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		23,343
Share in net assets		23,343
Total assets		78,096
Total liabilities		0
Net assets		78,096
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		0
Profit (loss) for the period of JointVentures		₩ 0
Energyco LLC
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership		29.00%
Effective percentage of ownership	[2]	29.00%
Acquisition cost		₩ 1,659
Book value [Abstract]
Acquisition		1,659
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		1,659
Share in net assets		830
Total assets		3,425
Total liabilities		563
Net assets		2,862
Investment differential		829
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		0
Profit (loss) for the period of JointVentures		₩ (2,856)
CAES, LLC
Disclosure of joint ventures [Line Items]
Key operation activities		Holding company
Location		USA
Percentage of ownership		36.00%
Effective percentage of ownership	[2]	36.00%
Acquisition cost		₩ 19,414
Book value [Abstract]
Acquisition		19,414
Disposal		0
Dividends received		(297)
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		(1,491)
Ending balance		17,626
Share in net assets		14,702
Total assets		40,840
Total liabilities		0
Net assets		40,840
Investment differential		2,924
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		0
Profit (loss) for the period of JointVentures		₩ (1,656)
Hapcheon Floating Photovoltaic Power Plant Inc.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership	[3]	19.47%
Effective percentage of ownership	[2]	19.47%
Acquisition cost		₩ 1,890
Book value [Abstract]
Acquisition		1,890
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		1,890
Share in net assets		1,890
Total assets		9,708
Total liabilities		0
Net assets		9,708
Investment differential		0
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		0
Profit (loss) for the period of JointVentures		₩ 0
Busan Industrial Solar Power Co., Ltd.
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership		28.02%
Effective percentage of ownership	[2]	28.02%
Acquisition cost		₩ 510
Book value [Abstract]
Acquisition		510
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		510
Share in net assets		220
Total assets		15,283
Total liabilities		14,499
Net assets		784
Investment differential		290
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		19
Profit (loss) for the period of JointVentures		₩ (485)
Bitsolar Energy Co., Ltd.,
Disclosure of joint ventures [Line Items]
Key operation activities		Power generation
Location		KOREA
Percentage of ownership		27.10%
Effective percentage of ownership	[2]	27.10%
Acquisition cost		₩ 352
Book value [Abstract]
Acquisition		352
Disposal		0
Dividends received		0
Share of income (loss)		0
Other comprehensive income (loss)		0
Others (book value)		0
Ending balance		352
Share in net assets		(1,302)
Total assets		144,758
Total liabilities		149,561
Net assets		(4,803)
Investment differential		1,654
Intercompany transaction		0
Others (consolidated FS)		0
Sales of JointVentures		0
Profit (loss) for the period of JointVentures		₩ (6,116)
Significant restrictions on its abilities		Dividends can only be paid when all conditions of the loan agreement are satisfied.
[1]	The effective percentage of ownership is more than 50%. However, according to the shareholders' agreement, all critical financial and operating decisions must be agreed to by all ownership parties. Accordingly, the entities are classified as joint ventures.
[2]	The percentage of ownership shown above is after considering the treasury stocks and others.
[3]	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.
[4]	Daejung Offshore Wind Power Co., Ltd. and GS Donghae Electric Power Co., Ltd. are reclassified from joint ventures to associates, and Jeongam Wind Power Co., Ltd. and Korea Power Engineering Service Co., Ltd. are reclassified from associates to joint ventures during the year ended December 31, 2019.
[5]	It was determined that there is objective evidence of impairment due to prolonged operating losses. As a result, the Company recognized an impairment loss of KRW248 million in impairment loss on investments in associates and joint ventures for the year ended December 31, 2019.
[6]	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
[7]	It was determined that there is objective evidence of impairment due to prolonged operating losses. As a result, the Company recognized an impairment loss of KRW347 million in impairment loss on investments in associates and joint ventures for the year ended December 31, 2019.
[8]	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.
[9]	The effective percentage of ownership is less than 20% but the Company has joint control over the entity as decisions on the major activities require the unanimous consent of the parties that collectively control the entity.
[10]	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.
[11]	It was determined that there is objective evidence of impairment due to prolonged operating losses. As a result, the Company recognized an impairment loss of KRW21,827 million in impairment loss on investments in associates and joint ventures for the year ended December 31, 2019.
[12]	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.
[13]	The effective percentage of ownership is more than 50%. However, according to the shareholders' agreement, all operation related decisions must be agreed by all ownership parties. Accordingly, the entity is classified as a joint venture.
[14]	Eumseong Natural Gas Power Co., Ltd. and Dangjin Eco Solar Power Co., Ltd. were established by spin-off from Dangjin Eco Power Co., Ltd. After the spin-off, Eumseong Natural Gas Power Co., Ltd. was merged and absorbed by the Company during December 2019.
[15]	The temporary percentage of ownership is more than 50% due to differences in the timing of the payment. The Company is expected to exert significant influence after payment is completed in the first quarter of 2020.
[16]	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
[17]	The effective percentage of ownership is less than 20%. However, according to the shareholders' agreement, decisions on the major activities must be agreed to by all ownership parties. Accordingly, the entities are classified as joint ventures.
[18]	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
[19]	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.
[20]	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.
[21]	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.

Property, Plant and Equipment_2

Property, Plant and Equipment (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Changes in property and equipment [Line Items]
Beginning balance	₩ 164,701,827	₩ 152,743,194
Effect of change in accounting policy	0	4,947,947
Acquisitions	13,593,937	14,221,355
Disposals	(685,326)	(964,308)
Depreciation	(11,376,100)	(10,966,756)
Impairment	(72,607)	(50,036)	[1],[2]
Others	2,547,656	4,770,431	[3],[4]
Ending balance	168,709,387	164,701,827
Land
Changes in property and equipment [Line Items]
Beginning balance	13,826,246	13,532,324
Ending balance	13,919,851	13,826,246
Land | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	13,848,063	13,554,292
Effect of change in accounting policy	0	0
Acquisitions	5,330	40,752
Disposals	(31,304)	(29,205)
Depreciation	(273)	0
Impairment	0	(25,626)	[1],[2]
Others	121,510	307,850	[3],[4]
Ending balance	13,943,326	13,848,063
Land | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	13,848,063	13,554,292
Ending balance	13,970,098	13,848,063
Land | Accumulated depreciation
Changes in property and equipment [Line Items]
Ending balance	(26,772)
Land | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(21,817)	(21,968)
Effect of change in accounting policy	0	0
Acquisitions	0	0
Disposals	2	151
Depreciation	0	0
Impairment	0	0	[1],[2]
Others	(1,660)	0	[3],[4]
Ending balance	(23,475)	(21,817)
Buildings
Changes in property and equipment [Line Items]
Beginning balance	12,383,786	11,870,502
Ending balance	12,559,301	12,383,786
Buildings | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	12,445,706	11,933,691
Effect of change in accounting policy	0	0
Acquisitions	7,225	3,195
Disposals	(16,015)	(23,409)
Depreciation	(875,680)	(821,680)
Impairment	(2,107)	(1,293)	[1],[2]
Others	1,057,403	1,355,202	[3],[4]
Ending balance	12,616,532	12,445,706
Buildings | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	20,756,351	19,431,536
Ending balance	21,773,824	20,756,351
Buildings | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(8,305,683)	(7,494,176)
Ending balance	(9,150,218)	(8,305,683)
Buildings | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(4,962)	(3,669)
Ending balance	(7,074)	(4,962)
Buildings | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(61,920)	(63,189)
Effect of change in accounting policy	0	0
Acquisitions	0	(592)
Disposals	0	0
Depreciation	5,206	6,214
Impairment	0	0	[1],[2]
Others	(517)	(4,353)	[3],[4]
Ending balance	(57,231)	(61,920)
Structures
Changes in property and equipment [Line Items]
Beginning balance	44,992,316	42,520,941
Ending balance	46,078,846	44,992,316
Structures | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	45,178,870	42,711,795
Effect of change in accounting policy		0
Acquisitions	36,091	1,663
Disposals	(346,612)	(470,230)
Depreciation	(2,313,920)	(2,399,283)
Impairment	(3,571)	(1,234)	[1],[2]
Others	3,707,997	5,336,159	[3],[4]
Ending balance	46,258,855	45,178,870
Structures | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	70,900,343	66,335,506
Ending balance	74,136,523	70,900,343
Structures | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(25,711,840)	(23,615,312)
Ending balance	(27,864,461)	(25,711,840)
Structures | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(9,633)	(8,339)
Ending balance	(13,207)	(9,633)
Structures | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(186,554)	(190,854)
Effect of change in accounting policy		0
Acquisitions		0
Disposals	2,032	2,405
Depreciation	9,526	9,373
Impairment	0	0	[1],[2]
Others	(5,013)	(7,478)	[3],[4]
Ending balance	(180,009)	(186,554)
Machinery
Changes in property and equipment [Line Items]
Beginning balance	49,748,393	47,283,353
Ending balance	49,881,002	49,748,393
Machinery | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	49,907,300	47,456,595
Effect of change in accounting policy	0	0
Acquisitions	407,521	326,606
Disposals	(283,845)	(248,951)
Depreciation	(5,526,816)	(5,452,669)
Impairment	(74,362)	(12,247)	[1],[2]
Others	5,608,989	7,837,966	[3],[4]
Ending balance	50,038,787	49,907,300
Machinery | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	89,224,339	82,047,823
Ending balance	94,295,027	89,224,339
Machinery | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(38,865,392)	(34,151,878)
Ending balance	(43,740,838)	(38,865,392)
Machinery | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(451,647)	(439,350)
Ending balance	(515,402)	(451,647)
Machinery | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(158,907)	(173,242)
Effect of change in accounting policy	0	0
Acquisitions	0	(1,050)
Disposals	496	635
Depreciation	17,468	17,993
Impairment	0	0	[1],[2]
Others	(16,842)	(3,243)	[3],[4]
Ending balance	(157,785)	(158,907)
Ships
Changes in property and equipment [Line Items]
Beginning balance	201	302
Ending balance	255	201
Ships | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	201	302
Effect of change in accounting policy	0	0
Acquisitions	0	0
Disposals	0	0
Depreciation	(106)	(100)
Impairment	0	0	[1],[2]
Others	160	(1)	[3],[4]
Ending balance	255	201
Ships | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	3,104	3,655
Ending balance	2,482	3,104
Ships | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(2,903)	(3,353)
Ending balance	(2,227)	(2,903)
Vehicles
Changes in property and equipment [Line Items]
Beginning balance	68,310	67,969
Ending balance	78,351	68,310
Vehicles | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	70,585	72,189
Effect of change in accounting policy	0	0
Acquisitions	3,880	3,789
Disposals	(151)	4,558
Depreciation	(35,036)	(33,650)
Impairment	0	0	[1],[2]
Others	39,705	23,699	[3],[4]
Ending balance	78,983	70,585
Vehicles | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	309,829	287,954
Ending balance	338,386	309,829
Vehicles | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(239,128)	(215,649)
Ending balance	(259,288)	(239,128)
Vehicles | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(116)	(116)
Ending balance	(115)	(116)
Vehicles | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(2,275)	(4,220)
Effect of change in accounting policy	0	0
Acquisitions	0	(228)
Disposals	4	5
Depreciation	2,064	2,170
Impairment	0	0	[1],[2]
Others	(425)	(2)	[3],[4]
Ending balance	(632)	(2,275)
Equipment
Changes in property and equipment [Line Items]
Beginning balance	373,874	382,441
Ending balance	407,616	373,874
Equipment | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	374,115	382,859
Effect of change in accounting policy	0	0
Acquisitions	72,655	47,532
Disposals	(86)	(162)
Depreciation	(186,004)	(199,376)
Impairment	0	(227)	[1],[2]
Others	147,163	143,489	[3],[4]
Ending balance	407,843	374,115
Equipment | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	1,716,210	1,558,309
Ending balance	1,895,528	1,716,210
Equipment | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(1,342,053)	(1,175,408)
Ending balance	(1,487,643)	(1,342,053)
Equipment | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(42)	(42)
Ending balance	(42)	(42)
Equipment | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(241)	(418)
Effect of change in accounting policy	0	0
Acquisitions	0	(81)
Disposals	0	0
Depreciation	149	262
Impairment	0	0	[1],[2]
Others	(135)	(4)	[3],[4]
Ending balance	(227)	(241)
Tools
Changes in property and equipment [Line Items]
Beginning balance	163,661	192,000
Ending balance	192,148	163,661
Tools | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	164,064	192,675
Effect of change in accounting policy	0	0
Acquisitions	28,048	20,956
Disposals	(193)	(31)
Depreciation	(82,862)	(87,708)
Impairment	0	0	[1],[2]
Others	83,330	38,172	[3],[4]
Ending balance	192,387	164,064
Tools | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	1,098,127	1,073,145
Ending balance	1,195,721	1,098,127
Tools | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(934,023)	(880,432)
Ending balance	(1,003,295)	(934,023)
Tools | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(40)	(38)
Ending balance	(39)	(40)
Tools | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(403)	(675)
Effect of change in accounting policy	0	0
Acquisitions	0	0
Disposals	0	0
Depreciation	243	281
Impairment	0	0	[1],[2]
Others	(79)	(9)	[3],[4]
Ending balance	(239)	(403)
Construction in progress
Changes in property and equipment [Line Items]
Beginning balance	28,358,259	28,766,427
Ending balance	30,869,001	28,358,259
Construction in progress | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	28,419,470	28,821,167
Effect of change in accounting policy	0	0
Acquisitions	12,726,469	13,544,091
Disposals	(486)	(199,853)
Depreciation	0	0
Impairment	7,799	(8,828)	[1],[2]
Others	(10,189,527)	(13,737,107)	[3],[4]
Ending balance	30,963,725	28,419,470
Construction in progress | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	28,584,806	29,026,880
Ending balance	31,121,255	28,584,806
Construction in progress | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(165,336)	(205,713)
Ending balance	(157,530)	(165,336)
Construction in progress | Government grants
Changes in property and equipment [Line Items]
Beginning balance	(61,211)	(54,740)
Effect of change in accounting policy	0	0
Acquisitions	8,783	12,338
Disposals	0	0
Depreciation	0	0
Impairment	0	0	[1],[2]
Others	(26,698)	(18,809)	[3],[4]
Ending balance	(79,126)	(61,211)
Finance lease assets
Changes in property and equipment [Line Items]
Beginning balance	0	195,704
Ending balance	0	0
Finance lease assets | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	0	195,730
Effect of change in accounting policy	0	(195,730)
Acquisitions	0	0
Disposals	0	0
Depreciation	0	0
Impairment	0	0	[1],[2]
Others	0	0	[3],[4]
Ending balance	0	0
Finance lease assets | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	0	2,390,701
Ending balance		0
Finance lease assets | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	0	(2,194,971)
Ending balance	0	0
Finance lease assets | Government grants
Changes in property and equipment [Line Items]
Beginning balance	0	(26)
Effect of change in accounting policy	0	26
Acquisitions	0	0
Disposals	0	0
Depreciation	0	0
Impairment	0	0	[1],[2]
Others	0	0	[3],[4]
Ending balance	0	0
Right-of-use assets
Changes in property and equipment [Line Items]
Beginning balance	4,783,573	0
Ending balance	4,542,166	4,783,573
Right-of-use assets | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	4,783,573	0
Effect of change in accounting policy	0	5,143,651
Acquisitions	291,334	220,996
Disposals	(827)	0
Depreciation	(586,254)	(581,074)
Impairment	0	0	[1],[2]
Others	54,340	0	[3],[4]
Ending balance	4,542,166	4,783,573
Right-of-use assets | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	7,574,010	0
Ending balance	7,905,214	7,574,010
Right-of-use assets | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(2,790,437)	0
Ending balance	(3,363,048)	(2,790,437)
Retirements, property, plant and equipment
Changes in property and equipment [Line Items]
Beginning balance	7,374,527	5,571,754
Ending balance	7,413,171	7,374,527
Retirements, property, plant and equipment | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	7,374,527	5,571,754
Effect of change in accounting policy	0	0
Acquisitions	131	0
Disposals	(196)	0
Depreciation	(819,708)	(626,856)
Impairment	0	0	[1],[2]
Others	858,417	2,429,629	[3],[4]
Ending balance	7,413,171	7,374,527
Retirements, property, plant and equipment | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	11,690,188	9,424,181
Ending balance	12,260,732	11,690,188
Retirements, property, plant and equipment | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(4,169,238)	(3,706,004)
Ending balance	(4,701,138)	(4,169,238)
Retirements, property, plant and equipment | Accumulated impairment losses
Changes in property and equipment [Line Items]
Beginning balance	(146,423)	(146,423)
Ending balance	(146,423)	(146,423)
Other property, plant and equipment
Changes in property and equipment [Line Items]
Beginning balance	2,628,681	2,359,477
Ending balance	2,752,081	2,628,681
Other property, plant and equipment | Carrying Amount Other than Government Grants [Member]
Changes in property and equipment [Line Items]
Beginning balance	2,628,681	2,359,477
Effect of change in accounting policy	0	0
Acquisitions	6,470	1,388
Disposals	(8,145)	(221)
Depreciation	(984,097)	(800,653)
Impairment	(366)	(581)	[1],[2]
Others	1,109,538	1,069,271	[3],[4]
Ending balance	2,752,081	2,628,681
Other property, plant and equipment | Acquisition cost
Changes in property and equipment [Line Items]
Beginning balance	12,955,782	11,875,394
Ending balance	13,979,980	12,955,782
Other property, plant and equipment | Accumulated depreciation
Changes in property and equipment [Line Items]
Beginning balance	(10,327,101)	(9,515,917)
Ending balance	₩ (11,227,899)	₩ (10,327,101)
[1]	As described in Note 2, the Company recognized impairment loss of KRW3,819 million related to Wolsong unit 1, Shin-Hanul unit 3 & 4 and reversal of impairment loss of KRW16,693 million related to Wolsong unit 1.
[2]	KEPCO Bylong Australia Pty., Ltd., 100% owned subsidiary, performed an impairment test over its land and others. The Company recognized the amount of the carrying amount in excess of its recoverable amount as an impairment loss.
[3]	'Others' include the amounts of assets acquired by the business combination. (see Note 51)
[4]	'Others' include the amounts reclassified from construction-in-progress to other assets during the prior year relating to the assets which became usable two years before but were considered immaterial.

Investment properties, net (Det

Investment properties, net (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about investment property [Line Items]
Beginning balance	₩ 158,580	₩ 159,559
Depreciation	(1,453)	(5,069)
Others	68,068	4,090
Endings balance	225,195	158,580
Carrying Amount Other than Government Grants
Disclosure of detailed information about investment property [Line Items]
Beginning balance	158,593	159,609
Depreciation	(1,454)	(5,070)
Others	68,085	4,054
Endings balance	225,224	158,593
Acquisition cost
Disclosure of detailed information about investment property [Line Items]
Beginning balance	194,487	174,741
Endings balance	259,738	194,487
Accumulated depreciation
Disclosure of detailed information about investment property [Line Items]
Beginning balance	(35,894)	(15,132)
Endings balance	(34,514)	(35,894)
Government grants
Disclosure of detailed information about investment property [Line Items]
Beginning balance	(13)	(50)
Depreciation	1	1
Others	(17)	36
Endings balance	(29)	(13)
Investment property - Land
Disclosure of detailed information about investment property [Line Items]
Beginning balance	129,897	139,940
Others	70,494	(10,043)
Endings balance	200,391	129,897
Investment property - Land | Carrying Amount Other than Government Grants
Disclosure of detailed information about investment property [Line Items]
Beginning balance	129,897	139,940
Others	70,494	(10,043)
Endings balance	200,391	129,897
Investment property - Land | Acquisition cost
Disclosure of detailed information about investment property [Line Items]
Beginning balance	129,897	139,940
Endings balance	200,391	129,897
Investment property - Buildings
Disclosure of detailed information about investment property [Line Items]
Beginning balance	28,683	19,619
Depreciation	(1,453)	(5,069)
Others	(2,426)	14,133
Endings balance	24,804	28,683
Investment property - Buildings | Carrying Amount Other than Government Grants
Disclosure of detailed information about investment property [Line Items]
Beginning balance	28,696	19,669
Depreciation	(1,454)	(5,070)
Others	(2,409)	14,097
Endings balance	24,833	28,696
Investment property - Buildings | Acquisition cost
Disclosure of detailed information about investment property [Line Items]
Beginning balance	64,590	34,801
Endings balance	59,347	64,590
Investment property - Buildings | Accumulated depreciation
Disclosure of detailed information about investment property [Line Items]
Beginning balance	(35,894)	(15,132)
Endings balance	(34,514)	(35,894)
Investment property - Buildings | Government grants
Disclosure of detailed information about investment property [Line Items]
Beginning balance	(13)	(50)
Depreciation	1	1
Others	(17)	36
Endings balance	₩ (29)	₩ (13)

Income and expenses on investme

Income and expenses on investment property (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income and expenses on investment property [Abstract]
Rental income	₩ 8,335	₩ 9,782
Operating and maintenance expenses related to rental income	(1,453)	(1,257)
Operating and maintenance expenses not related to rental income	0	(3,812)
Rental income from investment property, net of direct operating expense	₩ 6,882	₩ 4,713

The fair value of investment pr

The fair value of investment property (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure - The fair value of investment property [Line Items]
Fair value of Investment property	₩ 344,598	₩ 240,088
Carrying amount of Investment property	225,195	158,580
Land
Disclosure - The fair value of investment property [Line Items]
Fair value of Investment property	300,001	202,042
Carrying amount of Investment property	200,391	129,897
Buildings
Disclosure - The fair value of investment property [Line Items]
Fair value of Investment property	44,597	38,046
Carrying amount of Investment property	₩ 24,804	₩ 28,683

Construction Contracts (Details

Construction Contracts (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Construction Services Contracts [Abstract]
Beginning balance	₩ 2,735,141	₩ 3,620,788	₩ 4,176,595
Increase and decrease
new orders and foreign exchange impact	1,512,460	390,224	1,207,097
Changes in scope of construction work	(282,701)	(10,955)	(20,513)
Increase (decrease) in Construction contracts from new orders and foreign exchange	1,229,759	379,269	1,186,584
Recognized as revenue	(812,175)	(1,264,916)	(1,742,391)
Ending balance	₩ 3,152,725	₩ 2,735,141	₩ 3,620,788

Construction Services Contrac_3

Construction Services Contracts, Continued (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2020	Dec. 31, 2019
Accumulated earned revenue, expense and others
Accumulated earned revenue		₩ 21,460,431	₩ 20,971,487
Accumulated expense		20,242,735	19,566,647
Accumulated profit		1,217,696	1,404,840
Unearned advance receipts		97,348	0
Contract with Customer, Asset and Liability
Assets	[1]	79,662	53,827
Liabilities	[2]	₩ 88,126	₩ 73,420
[1]	Included in trade and other receivables, net, in the consolidated statements of financial position. The balance of trade receivables from construction contracts are KRW46,489 million and KRW39,063 million, as of December 31, 2019 and 2020, respectively.
[2]	Included in non-financial liabilities in the consolidated statements of financial position.

Detailed information about inta

Detailed information about intangible assets (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019		Dec. 31, 2018
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	₩ 1,167,953	₩ 1,228,524
Changes in intangible assets other than goodwill
Acquisition	120,560	324,821
Disposal	9,707	8,321
Amortization	(170,466)	(156,915)
Impairment loss	(3,599)	(513,609)		₩ (8,112)
Others	49,155	293,453	[1]
Ending balance	1,153,896	1,167,953		1,228,524
Intangible assets other than goodwill
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	1,069,976	1,225,942
Changes in intangible assets other than goodwill
Acquisition	120,371	229,426
Disposal	(9,707)	(8,321)
Amortization	(170,466)	(156,915)
Impairment loss	(3,599)	(513,609)
Others	49,155	293,453	[1]
Ending balance	1,055,730	1,069,976		1,225,942
Intangible assets other than goodwill | Carrying Amount Other than Government Grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	1,082,811	1,239,036
Changes in intangible assets other than goodwill
Acquisition	120,371	229,426
Disposal	(9,707)	(8,321)
Amortization	(172,022)	(157,952)
Impairment loss	(3,599)	(513,609)
Others	50,333	294,231	[1]
Ending balance	1,068,187	1,082,811		1,239,036
Intangible assets other than goodwill | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	3,597,314	3,069,716
Changes in intangible assets other than goodwill
Ending balance	3,769,026	3,597,314		3,069,716
Intangible assets other than goodwill | Accumulated amortization
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(1,967,732)	(1,805,784)
Changes in intangible assets other than goodwill
Ending balance	(2,138,536)	(1,967,732)		(1,805,784)
Intangible assets other than goodwill | Accumulated impairment [Member]
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(546,771)	(24,896)
Changes in intangible assets other than goodwill
Ending balance	(562,303)	(546,771)		(24,896)
Intangible assets other than goodwill | Government grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(12,835)	(13,094)
Changes in intangible assets other than goodwill
Acquisition	0	0
Disposal	0	0
Amortization	1,556	1,037
Impairment loss	0	0
Others	(1,178)	(778)	[1]
Ending balance	(12,457)	(12,835)		(13,094)
Software
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	164,760	157,261
Changes in intangible assets other than goodwill
Acquisition	14,101	42,694
Disposal	0	(774)
Amortization	(77,402)	(81,681)
Impairment loss	0	0
Others	50,568	47,260	[1]
Ending balance	152,027	164,760		157,261
Software | Carrying Amount Other than Government Grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	164,995	157,681
Changes in intangible assets other than goodwill
Acquisition	14,101	42,694
Disposal	0	(774)
Amortization	(77,501)	(81,883)
Impairment loss	0	0
Others	50,568	47,277	[1]
Ending balance	152,163	164,995		157,681
Software | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	707,731	619,662
Changes in intangible assets other than goodwill
Ending balance	775,667	707,731		619,662
Software | Accumulated amortization
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(542,736)	(461,981)
Changes in intangible assets other than goodwill
Ending balance	(623,504)	(542,736)		(461,981)
Software | Government grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(235)	(420)
Changes in intangible assets other than goodwill
Acquisition	0	0
Disposal	0	0
Amortization	99	202
Impairment loss	0	0
Others	0	(17)	[1]
Ending balance	(136)	(235)		(420)
Licences and franchises
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	0	0
Changes in intangible assets other than goodwill
Ending balance	0	0		0
Licences and franchises | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	3,398	3,398
Changes in intangible assets other than goodwill
Ending balance	547	3,398		3,398
Licences and franchises | Accumulated amortization
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(3,398)	(3,398)
Changes in intangible assets other than goodwill
Ending balance	(547)	(3,398)		(3,398)
Copyrights, patents rights and other industrial rights
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	53,261	67,112
Changes in intangible assets other than goodwill
Acquisition	369	171
Disposal	(390)	(325)
Amortization	(8,352)	(9,196)
Impairment loss	0	0
Others	(1,972)	(4,501)	[1]
Ending balance	42,916	53,261		67,112
Copyrights, patents rights and other industrial rights | Carrying Amount Other than Government Grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	53,261	67,112
Changes in intangible assets other than goodwill
Acquisition	369	171
Disposal	(390)	(325)
Amortization	(8,352)	(9,196)
Impairment loss	0	0
Others	(1,972)	(4,501)	[1]
Ending balance	42,916	53,261		67,112
Copyrights, patents rights and other industrial rights | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	102,828	97,033
Changes in intangible assets other than goodwill
Ending balance	101,866	102,828		97,033
Copyrights, patents rights and other industrial rights | Accumulated amortization
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(40,389)	(29,921)
Changes in intangible assets other than goodwill
Ending balance	(49,772)	(40,389)		(29,921)
Copyrights, patents rights and other industrial rights | Accumulated impairment [Member]
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(9,178)	0
Changes in intangible assets other than goodwill
Ending balance	(9,178)	(9,178)		0
Mining rights
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	43,723	534,524
Changes in intangible assets other than goodwill
Acquisition	1,664	8,742
Disposal	0	0
Amortization	(4,380)	(7,186)
Impairment loss	0	(513,519)	[2]
Others	1,383	21,162	[1]
Ending balance	42,390	43,723		534,524
Mining rights | Carrying Amount Other than Government Grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	43,723	534,524
Changes in intangible assets other than goodwill
Acquisition	1,664	8,742
Disposal	0	0
Amortization	(4,380)	(7,186)
Impairment loss	0	(513,519)	[2]
Others	1,383	21,162	[1]
Ending balance	42,390	43,723		534,524
Mining rights | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	584,969	561,945
Changes in intangible assets other than goodwill
Ending balance	604,703	584,969		561,945
Mining rights | Accumulated amortization
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(28,456)	(27,421)
Changes in intangible assets other than goodwill
Ending balance	(34,062)	(28,456)		(27,421)
Mining rights | Accumulated impairment [Member]
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(512,790)	0
Changes in intangible assets other than goodwill
Ending balance	(528,251)	(512,790)		0
Development expenditures
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	92,351	90,376
Changes in intangible assets other than goodwill
Acquisition	10,273	687
Disposal	0	0
Amortization	(30,581)	(28,068)
Impairment loss	0	(68)
Others	18,080	29,424	[1]
Ending balance	90,123	92,351		90,376
Development expenditures | Carrying Amount Other than Government Grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	93,843	92,486
Changes in intangible assets other than goodwill
Acquisition	10,273	687
Disposal	0	0
Amortization	(32,034)	(28,901)
Impairment loss	0	(68)
Others	23,084	29,639	[1]
Ending balance	95,166	93,843		92,486
Development expenditures | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	916,834	878,462
Changes in intangible assets other than goodwill
Ending balance	958,035	916,834		878,462
Development expenditures | Accumulated amortization
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(822,972)	(785,976)
Changes in intangible assets other than goodwill
Ending balance	(862,850)	(822,972)		(785,976)
Development expenditures | Accumulated impairment [Member]
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(19)	0
Changes in intangible assets other than goodwill
Ending balance	(19)	(19)		0
Development expenditures | Government grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(1,492)	(2,110)
Changes in intangible assets other than goodwill
Acquisition	0	0
Disposal	0	0
Amortization	1,453	833
Impairment loss	0	0
Others	(5,004)	(215)	[1]
Ending balance	(5,043)	(1,492)		(2,110)
Intangible assets under development
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	49,461	59,972
Changes in intangible assets other than goodwill
Acquisition	53,638	56,082
Disposal	0	0
Amortization	0	0
Impairment loss	(23)	0
Others	(43,261)	(66,593)	[1]
Ending balance	59,815	49,461		59,972
Intangible assets under development | Carrying Amount Other than Government Grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	60,490	70,536
Changes in intangible assets other than goodwill
Acquisition	53,638	56,082
Disposal	0	0
Amortization	0	0
Impairment loss	(23)	0
Others	(47,087)	(66,128)	[1]
Ending balance	67,018	60,490		70,536
Intangible assets under development | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	73,335	83,381
Changes in intangible assets other than goodwill
Ending balance	79,862	73,335		83,381
Intangible assets under development | Accumulated impairment [Member]
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(12,845)	(12,845)
Changes in intangible assets other than goodwill
Ending balance	(12,844)	(12,845)		(12,845)
Intangible assets under development | Government grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(11,029)	(10,564)
Changes in intangible assets other than goodwill
Acquisition	0	0
Disposal	0	0
Amortization	0	0
Impairment loss	0	0
Others	3,826	(465)	[1]
Ending balance	(7,203)	(11,029)		(10,564)
Usage rights of donated assets and other
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	193,161	87,011
Changes in intangible assets other than goodwill
Acquisition	0	0
Disposal	0	0
Amortization	(18,448)	(15,632)
Impairment loss	0	0
Others	9,762	121,782	[1]
Ending balance	184,475	193,161		87,011
Usage rights of donated assets and other | Carrying Amount Other than Government Grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	193,161	87,011
Changes in intangible assets other than goodwill
Acquisition	0	0
Disposal	0	0
Amortization	(18,448)	(15,632)
Impairment loss	0	0
Others	9,762	121,782	[1]
Ending balance	184,475	193,161		87,011
Usage rights of donated assets and other | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	582,825	459,682
Changes in intangible assets other than goodwill
Ending balance	592,930	582,825		459,682
Usage rights of donated assets and other | Accumulated amortization
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(389,664)	(372,671)
Changes in intangible assets other than goodwill
Ending balance	(408,455)	(389,664)		(372,671)
Usage rights of donated assets and other | Government grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	0	0
Changes in intangible assets other than goodwill
Acquisition	0	0
Disposal	0	0
Amortization	0	0
Impairment loss	0	0
Others	0	0	[1]
Ending balance	0	0		0
Leasehold rights
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	5,318	5,552
Changes in intangible assets other than goodwill
Acquisition	0	0
Disposal	0	0
Amortization	(831)	(741)
Impairment loss	0	0
Others	1,853	507	[1]
Ending balance	6,340	5,318		5,552
Leasehold rights | Carrying Amount Other than Government Grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	5,318	5,552
Changes in intangible assets other than goodwill
Acquisition	0	0
Disposal	0	0
Amortization	(831)	(741)
Impairment loss	0	0
Others	1,853	507	[1]
Ending balance	6,340	5,318		5,552
Leasehold rights | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	25,989	25,482
Changes in intangible assets other than goodwill
Ending balance	27,843	25,989		25,482
Leasehold rights | Accumulated amortization
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(20,671)	(19,930)
Changes in intangible assets other than goodwill
Ending balance	(21,503)	(20,671)		(19,930)
Greenhouse gas emissions rights
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	41,656	7,050
Changes in intangible assets other than goodwill
Acquisition	37,109	118,743
Disposal	(9,271)	(7,058)
Amortization	0	0
Impairment loss	0	0
Others	(8,121)	(77,079)	[1]
Ending balance	61,373	41,656		7,050
Greenhouse gas emissions rights | Carrying Amount Other than Government Grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	41,656	7,050
Changes in intangible assets other than goodwill
Acquisition	37,109	118,743
Disposal	(9,271)	(7,058)
Amortization	0	0
Impairment loss	0	0
Others	(8,121)	(77,079)	[1]
Ending balance	61,373	41,656		7,050
Greenhouse gas emissions rights | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	41,656	7,050
Changes in intangible assets other than goodwill
Ending balance	61,373	41,656		7,050
Others
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	426,285	217,084
Changes in intangible assets other than goodwill
Acquisition	3,217	2,307
Disposal	(46)	(164)
Amortization	(30,472)	(14,411)
Impairment loss	(3,576)	(22)
Others	20,863	221,491	[1]
Ending balance	416,271	426,285		217,084
Others | Carrying Amount Other than Government Grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	426,364	217,084
Changes in intangible assets other than goodwill
Acquisition	3,217	2,307
Disposal	(46)	(164)
Amortization	(30,476)	(14,413)
Impairment loss	(3,576)	(22)
Others	20,863	221,572	[1]
Ending balance	416,346	426,364		217,084
Others | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	557,749	333,621
Changes in intangible assets other than goodwill
Ending balance	566,200	557,749		333,621
Others | Accumulated amortization
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(119,446)	(104,486)
Changes in intangible assets other than goodwill
Ending balance	(137,843)	(119,446)		(104,486)
Others | Accumulated impairment [Member]
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(11,939)	(12,051)
Changes in intangible assets other than goodwill
Ending balance	(12,011)	(11,939)		(12,051)
Others | Government grants
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	(79)	0
Changes in intangible assets other than goodwill
Acquisition	0	0
Disposal	0	0
Amortization	4	2
Impairment loss	0	0
Others	0	(81)	[1]
Ending balance	(75)	(79)		0
Goodwill
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	97,977	2,582
Changes in intangible assets other than goodwill
Acquisition	189	95,395
Disposal	0	0
Amortization	0	0
Impairment loss	0	0
Others	0	0	[1]
Ending balance	98,166	97,977		2,582
Goodwill | Acquisition cost
Reconciliation of changes in intangible assets other than goodwill
Beginning balance	97,977	2,582
Changes in intangible assets other than goodwill
Ending balance	₩ 98,166	₩ 97,977		₩ 2,582
[1]	'Others' include the business rights amounting to KRW172,434 million increased from the business combination between Korea East-West Power Co., Ltd. and Eumseong Natural Gas Power Co., Ltd.
[2]	KEPCO Australia Pty., Ltd. and KEPCO Bylong Australia Pty., Ltd., 100% owned subsidiaries, performed an impairment test over the mining rights and the Company recognized the amount of the carrying amount in excess of its recoverable amount as an impairment loss.

Intangible Assets other than _3

Intangible Assets other than Goodwill (Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2020KRW (₩)	Dec. 31, 2019KRW (₩)	Dec. 31, 2020AUD ($)	Dec. 31, 2019AUD ($)
Software | ERP system and others
Disclosure of intangible assets material to entity [Line Items]
Carrying value	₩ 81	₩ 432
Remaining amortisation period of intangible assets material to entity	2 months ~ 4 months	1 years and 2 months ~ 1 years and 4 months
Software | Electricity sales information system
Disclosure of intangible assets material to entity [Line Items]
Carrying value		₩ 4,824
Remaining amortisation period of intangible assets material to entity		3 years
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	₩ 4,936	₩ 6,787
Remaining amortisation period of intangible assets material to entity	1 years and 9 months	2 years 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	₩ 29,219	₩ 34,755
Remaining amortisation period of intangible assets material to entity	7 years	8 years
Mining rights | Mining right of Bylong mine
Disclosure of intangible assets material to entity [Line Items]
Carrying value | $			$ 0	$ 0
Remaining amortisation period of intangible assets material to entity	The carrying amount of mining right does not exist, because KEPCO Australia Pty., Ltd. and KEPCO Bylong Australia Pty., Ltd. had recognized impairment losses in full.	The carrying amount of mining right does not exist, because KEPCO Australia Pty., Ltd. and KEPCO Bylong Australia Pty., Ltd. recognized impairment losses in full during the year ended December 31, 2019.
Development expenditures | Electricity sales information system
Disclosure of intangible assets material to entity [Line Items]
Carrying value	₩ 8,229	₩ 15,283
Remaining amortisation period of intangible assets material to entity	1 years and 2 months	2 years and 3 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	₩ 7,870
Remaining amortisation period of intangible assets material to entity	3 months	1 years 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	₩ 10,016
Remaining amortisation period of intangible assets material to entity	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	₩ 26,847	₩ 31,385
Remaining amortisation period of intangible assets material to entity	5 years and 11 months	6 years and 11 months
Others | Occupancy and use of public waters
Disclosure of intangible assets material to entity [Line Items]
Carrying value	₩ 87,035	₩ 92,446
Remaining amortisation period of intangible assets material to entity	16 years 1 months	17 years 1 months
Others | Greenhouse gas emissions rights
Disclosure of intangible assets material to entity [Line Items]
Carrying value	₩ 61,373
Remaining amortisation period of intangible assets material to entity	-
Others | Business rights
Disclosure of intangible assets material to entity [Line Items]
Carrying value	₩ 166,207	₩ 171,955
Remaining amortisation period of intangible assets material to entity	28 years 11 months	29 years 11 months

Research and development expens

Research and development expenses (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Research and Development Expense [Abstract]
Research and development expense	₩ 700,642	₩ 735,715	₩ 723,888

Trade and Other Payables (Detai

Trade and Other Payables (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Trade and other payables [Line Items]
Trade payables	₩ 2,606,861	₩ 2,859,721
Non trade payables	4,110,033	4,399,373
Accrued expenses	1,199,853	1,030,902
Leasehold deposits received	3,279	3,280
Other deposits received	151,150	232,084
Lease liabilities	4,621,096	5,070,133	₩ 283,806
Dividends payable	4,271	6,851
Trade and other payables Others
Advance received from local governments	4,278	5,818
Others	36,112	7,000
Others	40,390	12,818
Total trade and other payables	12,736,933	13,615,162
Current trade and other payables
Trade and other payables [Line Items]
Trade payables	2,606,861	2,859,721
Non trade payables	1,785,068	1,952,659
Accrued expenses	1,197,815	1,028,869
Leasehold deposits received	2,336	2,571
Other deposits received	83,505	163,382
Lease liabilities	576,665	635,349
Dividends payable	4,271	6,851
Trade and other payables Others
Advance received from local governments	0	0
Others	0	0
Others	0	0
Total trade and other payables	6,256,521	6,649,402
Non-current trade and other payables
Trade and other payables [Line Items]
Trade payables	0	0
Non trade payables	2,324,965	2,446,714
Accrued expenses	2,038	2,033
Leasehold deposits received	943	709
Other deposits received	67,645	68,702
Lease liabilities	4,044,431	4,434,784
Dividends payable	0	0
Trade and other payables Others
Advance received from local governments	4,278	5,818
Others	36,112	7,000
Others	40,390	12,818
Total trade and other payables	₩ 6,480,412	₩ 6,965,760

Borrowings and Debt Securitie_2

Borrowings and Debt Securities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Current Borrowings and Debt Securities
Short-term borrowings	₩ 1,436,922	₩ 1,098,555
Current portion of long-term borrowings	677,982	217,579
Current portion of debt securities	8,565,301	7,545,485
Less : Current portion of discount on long-term borrowings	(1,723)	(1,000)
Less : Current portion of discount on debt securities	(3,677)	(2,780)
Add : Current portion of premium on debt securities	0	0
Current Borrowings and Debt Securities	10,674,805	8,857,839
Non-current Borrowings and Debt Securities
Long-term borrowings	3,018,898	3,411,052
Debt securities	56,188,234	55,716,183
Less : Discount on long-term borrowings	(14,899)	(21,309)
Less : Discount on debt securities	(143,823)	(88,920)
Add : Premium on debt securities	1,366	1,696
Non-current Borrowings and Debt Securities	59,049,776	59,018,702
Total	₩ 69,724,581	₩ 67,876,541

Borrowings and Debt Securitie_3

Borrowings and Debt Securities - Repayment schedule of borrowings and debt securities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Repayment schedule of borrowings and debt securities [Line Items]
Borrowings	₩ 5,133,802	₩ 4,727,186
Debt Securities	64,753,535	63,261,668
Less than 1 year
Repayment schedule of borrowings and debt securities [Line Items]
Borrowings	2,114,904	1,316,134
Debt Securities	8,565,301	7,545,485
1~5 Years
Repayment schedule of borrowings and debt securities [Line Items]
Borrowings	1,564,252	2,113,404
Debt Securities	28,746,117	31,552,963
Over 5 Years
Repayment schedule of borrowings and debt securities [Line Items]
Borrowings	1,454,646	1,297,648
Debt Securities	₩ 27,442,117	₩ 24,163,220

Borrowings and Debt Securitie_4

Borrowings and Debt Securities : Short-term borrowings (Details) ₱ in Thousands, $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2020KRW (₩)		Dec. 31, 2019KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2019PHP (₱)
Disclosure of detailed information about Short-term borrowings [Line Items]
Short-term borrowings	₩ 1,436,922		₩ 1,098,555
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	0.80 ~ 4.60		2.00 ~ 2.20
Borrowings, maturity	2021.01.05 ~2021.12.31		2020.01.13 ~2020.02.05
Short-term borrowings	₩ 580,004		₩ 280,000
Foreign short-term borrowings
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor	Shinhan Bank		LG-CNS
Borrowings interest rate	0.71 ~ 0.74		4.60
Borrowings, maturity	2021.01.04 ~2021.03.31		2020.06.30
Short-term borrowings	₩ 60,268		₩ 27,439	$ 55,393	$ 23,699
Foreign short-term borrowings
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor	Korea Development Bank and others		BDO Unibank
Borrowings interest rate	1M Libor + 1.25		3M BVAL + 0.50
Borrowings, maturity	2022.04.29	[1]	2020.12.20
Short-term borrowings	₩ 81,290		₩ 5,130	$ 73,704		₱ 225,000
Foreign short-term borrowings
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor			Mizuho Bank
Borrowings interest rate			4.60
Borrowings, maturity			2020.06.30
Short-term borrowings			₩ 12,767		$ 11,027
Local bank overdraft
Disclosure of detailed information about Short-term borrowings [Line Items]
Name of Creditor	Woori Bank		Korea development Bank and others
Borrowings interest rate	Standard overdraft rate + 1.26		1.98 ~ 2.75
Borrowings, maturity	2021.02.26		2020.01.01 ~2020.04.16
Short-term borrowings	₩ 29,960		₩ 373,219
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	KB Securities and others		Mirae asset daewoo and others
Borrowings interest rate	0.75 ~ 1.35		1.72 ~ 2.20
Borrowings, maturity	2021.01.13 ~2021.03.18		2020.01.10 ~2020.02.05
Short-term borrowings	₩ 470,000		₩ 400,000
[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, 2020KRW (₩)	Dec. 31, 2019KRW (₩)	Dec. 31, 2020USD ($)	Dec. 31, 2020JOD (JD)	Dec. 31, 2020JPY (¥)	Dec. 31, 2019USD ($)	Dec. 31, 2019JOD (JD)	Dec. 31, 2019JPY (¥)	Dec. 31, 2019PKR (₨)
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings	₩ 3,696,880	₩ 3,628,631
Less : Discount on long-term borrowings	(16,622)	(22,309)
Less : Current portion of long-term borrowings	(677,982)	(217,579)
Add : Current portion of discount on long-term borrowings	1,723	1,000
Long-term borrowings	3,003,999	3,389,743
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings	₩ 2,485,062	₩ 2,283,166
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	2021~2044	2020~2044
Borrowings	₩ 2,946	₩ 3,500
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	2021~2028	2023~2028
Borrowings	₩ 50,293	₩ 59,845
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	2.33~3.04
Borrowings, maturity	2022	2020~2022
Borrowings	₩ 20,000	₩ 55,000
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+0.95
Borrowings, maturity	2022~2023	2020~2022
Borrowings	₩ 24,300	₩ 24,000
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Hana Bank	Hana Bank
Purpose of borrowings	Commercial Paper	Commercial Paper
Borrowings interest rate	3M CD+0.13~0.32	3M CD+0.13~0.32
Borrowings, maturity	2021~2024	2021~2024
Borrowings	₩ 1,150,000	₩ 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	₩ 11,088	₩ 12,466
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 Standard overdraft rate+1.50~2.45	3yr KTB rate-1.25
Borrowings, maturity	2021~2035	2020~2028
Borrowings	₩ 43,419	₩ 6,699
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	₩ 9,543	₩ 10,497
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	₩ 16,204	₩ 19,150
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	Operating funds
Borrowings interest rate	1.32	2.21
Borrowings, maturity	2028	2020
Borrowings	₩ 32,000	₩ 35,000
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Export-Import Bank of Korea	Korea Energy Agency
Purpose of borrowings	Operating funds	Development of power resources
Borrowings interest rate	1.78	3yr KTB rate-2.25
Borrowings, maturity	2023	2023~2025
Borrowings	₩ 15,700	₩ 4,350
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	Facility
Borrowings interest rate	3yr KTB rate-2.25	3yr KTB rate-2.25
Borrowings, maturity	2023~2025	2020~2024
Borrowings	₩ 2,509	₩ 2,058
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	Project loans
Borrowings interest rate	3yr KTB rate-2.25	-
Borrowings, maturity	2021~2024	2023
Borrowings	₩ 1,527	₩ 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	Project loans	Others
Borrowings interest rate	-	KTB rate-2.25
Borrowings, maturity	2023	2024~2028
Borrowings	₩ 1,197	₩ 15,696
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Korea Energy Agency	Shinhan Bank
Purpose of borrowings	Others	Facility
Borrowings interest rate	KTB rate-2.25	CB rate+1.10
Borrowings, maturity	2024~2028	2028
Borrowings	₩ 14,045	₩ 18,698
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Shinhan Bank	Shinhan Bank
Purpose of borrowings	Facility	Others
Borrowings interest rate	CB rate+1.10	3.95
Borrowings, maturity	2028	2035
Borrowings	₩ 16,632	₩ 99,146
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Shinhan Bank	Shinhan Bank
Purpose of borrowings	Others	Others
Borrowings interest rate	3.95	Standard overdraft rate+1.00
Borrowings, maturity	2034	2035
Borrowings	₩ 89,257	₩ 99,146
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Shinhan Bank	Kookmin Bank
Purpose of borrowings	Others	Facility
Borrowings interest rate	Standard overdraft rate+1.00	3.16
Borrowings, maturity	2034	2020
Borrowings	₩ 89,257	₩ 10,000
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Kookmin Bank	Kookmin Bank
Purpose of borrowings	Facility	Facility
Borrowings interest rate	MOR+0.79 3M CD+1.79	MOR+0.79
Borrowings, maturity	2021~2031	2023
Borrowings	₩ 46,512	₩ 23,333
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	1.75~6.80	1.75~6.80
Borrowings, maturity	2026~2037	2026~2036
Borrowings	₩ 510,262	₩ 390,044
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	CB rate+1.10~1.20 3M CD+1.60 Standard overdraft rate+1.50~2.45	CB rate+1.10~1.60 Standard overdraft rate+2.45
Borrowings, maturity	2023~2037	2023~2036
Borrowings	₩ 89,506	₩ 111,834
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Others	Others
Purpose of borrowings	PF Refinancing	PF Refinancing
Borrowings interest rate	4.10	4.10
Borrowings, maturity	2030	2030
Borrowings	₩ 26,509	₩ 29,159
Local long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Others	Others
Purpose of borrowings	Others	Others
Borrowings interest rate	3.90~7.90	4.50~7.90
Borrowings, maturity	2023~2039	2022~2039
Borrowings	₩ 222,356	₩ 102,348
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Borrowings	₩ 1,211,818	₩ 1,345,465
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	2021~2023	2021~2023
Borrowings	₩ 9,513	₩ 10,123	$ 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	₩ 104,463	₩ 117,994	96,014			101,912
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	₩ 202,912	₩ 239,039		JD 132,228			JD 14,638
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+2.50~2.70
Borrowings, maturity	2032	2032
Borrowings	₩ 121,013	₩ 137,412	111,225			118,684
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	Others	Others
Borrowings interest rate	3.88	3.88
Borrowings, maturity	2021	2021
Borrowings	₩ 314,986	₩ 334,685	289,509			289,079
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor		SCNT and others
Purpose of borrowings		Shareholder's loan
Borrowings interest rate		6.50~8.00
Borrowings, maturity		2023
Borrowings		₩ 15,051				13,000
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor		SCNT and others
Purpose of borrowings		Shareholder's loan
Borrowings interest rate		8.00
Borrowings, maturity		2031
Borrowings		₩ 7,925					JD 4,853
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	POSCO and others
Purpose of borrowings	Shareholder's loan
Borrowings interest rate	8.00
Borrowings, maturity	2023
Borrowings	₩ 15,298		14,061
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	POSCO and others
Purpose of borrowings	Shareholder's loan
Borrowings interest rate	8.00
Borrowings, maturity	2031
Borrowings	₩ 7,447			JD 4,853
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Samsung Life Insurance and others	Samsung Life Insurance and others
Purpose of borrowings	Syndicated loan	Syndicated loan
Borrowings interest rate	3.10	3.10
Borrowings, maturity	2032	2032
Borrowings	₩ 49,369	₩ 52,972			¥ 4,682,816			¥ 4,981,038
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Woori Bank and others	Woori Bank and others
Purpose of borrowings	Syndicated Loan	Syndicated loan
Borrowings interest rate	JPY 6M Libor+2.00	JPY 6M Libor+2.00
Borrowings, maturity	2032	2032
Borrowings	₩ 31,847	₩ 34,171			¥ 3,020,746			¥ 3,213,121
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	₩ 243,837	₩ 278,652	224,115						₨ 37,252,930
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 Loan	PF loan
Borrowings interest rate	2.39~6.00	2.39~13
Borrowings, maturity	2031~2038	2031~2038
Borrowings	₩ 105,913	₩ 117,377	97,347			101,380
Foreign long-term borrowings
Disclosure of detailed information about Long-term borrowings [Line Items]
Name of Creditor	Other Creditors	Other Creditors
Purpose of borrowings	Others	Others
Borrowings interest rate	-	-
Borrowings, maturity	-	-
Borrowings	₩ 5,220	₩ 64	$ 4,798			$ 57

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, 2020KRW (₩)

Dec. 31, 2019KRW (₩)

Dec. 31, 2020USD ($)

Dec. 31, 2020HKD ($)

Dec. 31, 2020CHF (SFr)

Dec. 31, 2020AUD ($)

Dec. 31, 2020EUR (€)

Dec. 31, 2020SEK (kr)

Dec. 31, 2019USD ($)

Dec. 31, 2019HKD ($)

Dec. 31, 2019CHF (SFr)

Dec. 31, 2019AUD ($)

Dec. 31, 2019EUR (€)

Dec. 31, 2019SEK (kr)

Debt Instrument [Line Items]

Bonds issued

₩ 64,753,535

₩ 63,261,668

Less : Discount on debt securities

(147,500)

(91,700)

Add : Premium on debt securities

1,366

1,696

Less : Current portion of debt securities

(8,565,301)

(7,545,485)

Add : Current portion of discount on debt securities

3,677

2,780

Less: Current portion of premium on foreign debt securities

0

0

Total

56,045,777

55,628,959

Local Debt securities

Debt Instrument [Line Items]

Bonds issued

54,273,577

52,913,577

Less : Discount on debt securities

(46,730)

(42,274)

Less : Current portion of debt securities

(7,243,217)

(6,340,000)

Add : Current portion of discount on debt securities

2,108

1,409

Total

₩ 46,985,738

₩ 46,532,712

Electricity Bonds

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2011.05.06 ~2020.11.04

2011.05.06 ~2020.11.04

Debt Instrument, Maturity Date, Description

2021.02.08 ~2049.10.24

2021.02.08 ~2049.10.24

Interest rate (%)

1.02~4.58

1.02~4.58

Bonds issued

₩ 27,810,000

₩ 28,450,000

Corporate bonds

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2009.10.16 ~2020.12.22

2009.10.16 ~2020.12.22

Debt Instrument, Maturity Date, Description

2021.01.11 ~2050.12.22

2021.01.11 ~2050.12.22

Interest rate (%)

1.00~6.00

1.00~6.00

Bonds issued

[1]

₩ 26,463,577

₩ 24,463,577

Foreign Debt securities

Debt Instrument [Line Items]

Bonds issued

10,479,958

10,348,091

Less : Discount on debt securities

(100,770)

(49,426)

Add : Premium on debt securities

1,366

1,696

Less : Current portion of debt securities

(1,322,084)

(1,205,485)

Add : Current portion of discount on debt securities

1,569

1,371

Less: Current portion of premium on foreign debt securities

0

0

Total

₩ 9,060,039

₩ 9,096,247

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

₩ 303,227

₩ 288,379

$ 278,701

$ 249,074

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

₩ 342,412

₩ 364,379

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

₩ 312,169

₩ 332,196

286,920

286,920

FY-11

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2011.07.13

2011.07.13

Debt Instrument, Maturity Date, Description

2021.07.13

2021.07.13

Interest rate (%)

4.75

4.75

Bonds issued

₩ 544,000

₩ 578,900

500,000

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

₩ 816,000

₩ 868,350

750,000

750,000

FY-13

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2013.09.25

Debt Instrument, Maturity Date, Description

2020.09.25

Interest rate (%)

5.75

Bonds issued

₩ 263,361

$ 325,000

FY-14

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2014.07.30

2014.07.30~2014.12.02

Debt Instrument, Maturity Date, Description

2029.07.30

2020.06.02~2029.07.30

Interest rate (%)

3.57

2.50~3.57

Bonds issued

₩ 108,800

₩ 694,680

100,000

600,000

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

₩ 326,400

₩ 347,340

300,000

300,000

FY-16

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2016.01.21

2016.01.21

Debt Instrument, Maturity Date, Description

2021.07.21

2021.07.21

Interest rate (%)

2.50

2.50

Bonds issued

₩ 326,400

₩ 347,340

300,000

300,000

FY-17

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2017.06.19~2017.07.25

2017.04.12~2017.07.25

Debt Instrument, Maturity Date, Description

2022.06.19~2027.07.25

2020.04.12~2027.07.25

Interest rate (%)

2.63~3.13

2.38~3.13

Bonds issued

₩ 870,400

₩ 1,273,580

800,000

1,100,000

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

₩ 53,530

₩ 51,897

€ 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

₩ 59,747

₩ 55,737

kr 450,000

kr 450,000

FY-18

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2018.01.29~2018.07.25

2018.01.29~2018.07.25

Debt Instrument, Maturity Date, Description

2021.01.29~2023.07.25

2021.01.29~2023.07.25

Interest rate (%)

3.00~3.88

3.00~3.88

Bonds issued

₩ 1,958,400

₩ 2,084,040

1,800,000

1,800,000

FY-18

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2018.03.13

2018.03.13

Debt Instrument, Maturity Date, Description

2028.03.13

2028.03.13

Interest rate (%)

3.35

3.35

Bonds issued

₩ 231,578

₩ 245,289

$ 1,650,000

$ 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

₩ 870,400

₩ 926,240

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

₩ 246,866

₩ 239,104

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

₩ 370,299

₩ 358,656

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

₩ 326,400

₩ 347,340

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

₩ 250,968

₩ 243,102

$ 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

₩ 421,163

₩ 438,181

387,098

$ 378,460

FY-20

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2020.02.03

Debt Instrument, Maturity Date, Description

2025.02.03

Interest rate (%)

2.13

Bonds issued

₩ 326,400

300,000

FY-20

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2020.06.15

Debt Instrument, Maturity Date, Description

2025.06.15

Interest rate (%)

1.13

Bonds issued

₩ 544,000

500,000

FY-20

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2020.05.06

Debt Instrument, Maturity Date, Description

2025.05.06

Interest rate (%)

1.75

Bonds issued

₩ 544,000

500,000

FY-20

Debt Instrument [Line Items]

Debt Instrument, Issuance Date

2020.08.03

Debt Instrument, Maturity Date, Description

2026.02.03

Interest rate (%)

0.61

Bonds issued

₩ 326,399

$ 300,000

[1]

Among the corporate bonds, each holder of Hee mang sunlight Power Co., Ltd.'s private equity bonds, amounting to KRW2,697 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.

Disclosure of quantitative info

Disclosure of quantitative information about right-of-use assets (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019
Disclosure of quantitative information about right-of-use assets [Line Items]
Effect of change in accounting policy		₩ 0		₩ 4,947,947
Increase		13,593,937		14,221,355
Depreciation		(586,254)		(581,074)
Right-of-use assets
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		4,783,573		0
Effect of change in accounting policy	[1]			5,143,651
Increase		291,334		220,996
Depreciation		(586,254)		(581,074)
Decrease		(827)
Others		54,340
Ending balance		4,542,166		4,783,573
Right-of-use assets | Acquisition cost
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		7,574,010		0
Ending balance		7,905,214		7,574,010
Right-of-use assets | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		(2,790,437)		0
Ending balance		(3,363,048)		(2,790,437)
Land
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		644,074		0
Effect of change in accounting policy				684,386
Increase		12,269		8,717
Depreciation		(52,069)		(49,029)
Decrease		0
Others		102,305
Ending balance		706,579		644,074
Land | Acquisition cost
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		693,103		0
Ending balance		811,014		693,103
Land | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		(49,029)		0
Ending balance		(104,435)		(49,029)
Buildings
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		34,577		0
Effect of change in accounting policy				36,874
Increase		53,182		18,106
Depreciation		(37,609)		(20,403)
Decrease		(803)
Others		(2,125)
Ending balance		47,222		34,577
Buildings | Acquisition cost
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		54,980		0
Ending balance		82,749		54,980
Buildings | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		(20,403)		0
Ending balance		(35,527)		(20,403)
Structures
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		25,644		0
Effect of change in accounting policy				20,840
Increase		260		7,358
Depreciation		(1,485)		(2,554)
Decrease		0
Others		(3,933)
Ending balance		20,486		25,644
Structures | Acquisition cost
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		28,198		0
Ending balance		24,175		28,198
Structures | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		(2,554)		0
Ending balance		(3,689)		(2,554)
Machinery
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		824		0
Effect of change in accounting policy				0
Increase		0		1,308
Depreciation		(129)		(484)
Decrease		0
Others		0
Ending balance		695		824
Machinery | Acquisition cost
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		1,308		0
Ending balance		1,308		1,308
Machinery | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		(484)		0
Ending balance		(613)		(484)
Ships
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		3,688,289		0
Effect of change in accounting policy				3,986,947
Increase		183,789		126,807
Depreciation		(427,221)		(425,465)
Decrease		0
Others		(7,494)
Ending balance		3,437,363		3,688,289
Ships | Acquisition cost
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		4,113,754		0
Ending balance		4,280,331		4,113,754
Ships | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		(425,465)		0
Ending balance		(842,968)		(425,465)
Vehicles
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		13,708		0
Effect of change in accounting policy				11,258
Increase		9,009		9,559
Depreciation		(7,747)		(7,109)
Decrease		(21)
Others		(1,424)
Ending balance		13,525		13,708
Vehicles | Acquisition cost
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		20,817		0
Ending balance		29,281		20,817
Vehicles | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		(7,109)		0
Ending balance		(15,756)		(7,109)
Others
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		376,457	[2]	0
Effect of change in accounting policy				403,346
Increase		32,825		49,141
Depreciation		(59,994)		(76,030)
Decrease		(3)
Others		(32,989)
Ending balance		316,296	[3]	376,457	[2]
Others | Acquisition cost
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		2,661,850	[2]	0
Ending balance		2,676,356	[3]	2,661,850	[2]
Others | Accumulated depreciation
Disclosure of quantitative information about right-of-use assets [Line Items]
Beginning balance		(2,285,393)	[2]	0
Ending balance		₩ (2,360,060)	[3]	₩ (2,285,393)	[2]
[1]	Including transferred amount of KRW195,704 million, which was classified as finance lease assets as of December 31, 2018.
[2]	Including power purchase agreements ("PPA") with GS EPS and two other LNG combined power suppliers.
[3]	Including power purchase agreements ("PPA") with GS EPS and another LNG combined power supplier.

Lease Liabilities (Details)

Lease Liabilities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of maturity analysis of operating lease payments [Line Items]
Undiscounted operating lease payments to be received	₩ 5,209,537	₩ 5,757,009
Less than 1 year
Disclosure of maturity analysis of operating lease payments [Line Items]
Undiscounted operating lease payments to be received	614,442	686,445
1~5 Years
Disclosure of maturity analysis of operating lease payments [Line Items]
Undiscounted operating lease payments to be received	2,133,538	2,334,883
More than 5 years
Disclosure of maturity analysis of operating lease payments [Line Items]
Undiscounted operating lease payments to be received	₩ 2,461,557	₩ 2,735,681

Lease Liabilities _ Liquidity c

Lease Liabilities : Liquidity classification (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Lease liabilities [Abstract]
Current lease liabilities	₩ 576,665	₩ 635,349
Non-current lease liabilities	4,044,431	4,434,784
Total lease liabilities	4,621,096	5,070,133	₩ 283,806
Less : Discount	(588,441)	(686,876)
Undiscounted operating lease payments to be received	₩ 5,209,537	₩ 5,757,009

Changes in lease liabilities (D

Changes in lease liabilities (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Disclosure - Changes in lease liabilities [Abstract]
Beginning balance		₩ 5,070,133	₩ 283,806
Changes in accounting policies		0	4,943,584
Increase		280,114	218,800
Decrease		(725,759)	(659,387)
Interest expenses on lease liabilities		111,782	85,950
Effect of exchange rate fluctuations and others	[1]	(115,174)	197,380
Ending balance		₩ 4,621,096	₩ 5,070,133
[1]	Including translation effect of foreign currency lease liabilities and others.

Details of expense relating to

Details of expense relating to lease contracts as lessee (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure - Details of expense relating to lease contracts as lessee [Abstract]
Depreciation of right-of-use assets	₩ 586,254	₩ 581,074
Interest expenses on lease liabilities	111,782	85,950
Leases expenses for short-term leases	45,787	20,127
Leases expenses for leases of low-value assets	2,796	1,616
Variable lease payments	33,267	(15,912)
Total expense relating to lease contracts as lessee	₩ 779,886	₩ 672,855

Finance Lease Receivables (Deta

Finance Lease Receivables (Details) - Gross amount - KRW (₩) ₩ in Millions		Dec. 31, 2020	Dec. 31, 2019
Disclosure of maturity analysis of finance lease payments receivable [Line Items]
Undiscounted finance lease payments to be received		₩ 2,315,752	₩ 2,510,564
Less : Unearned finance income		(1,192,686)	(1,331,723)
Net investment in finance lease	[1]	1,123,066	1,178,841
Not Later Than 1 Year
Disclosure of maturity analysis of finance lease payments receivable [Line Items]
Undiscounted finance lease payments to be received		162,211	173,093
1~5 Years
Disclosure of maturity analysis of finance lease payments receivable [Line Items]
Undiscounted finance lease payments to be received		569,965	596,819
1~2 Years
Disclosure of maturity analysis of finance lease payments receivable [Line Items]
Undiscounted finance lease payments to be received		148,485	150,895
2~3 Years
Disclosure of maturity analysis of finance lease payments receivable [Line Items]
Undiscounted finance lease payments to be received		144,913	150,596
3~4 Years
Disclosure of maturity analysis of finance lease payments receivable [Line Items]
Undiscounted finance lease payments to be received		139,605	149,364
4~5 Years
Disclosure of maturity analysis of finance lease payments receivable [Line Items]
Undiscounted finance lease payments to be received		136,962	145,964
More than 5 years
Disclosure of maturity analysis of finance lease payments receivable [Line Items]
Undiscounted finance lease payments to be received		₩ 1,583,576	₩ 1,740,652
[1]	Including the present value of unguaranteed residual value amounting to KRW15,946 million and KRW16,407 million, as of December 31, 2019 and 2020, respectively.

Changes in the allowance for do

Changes in the allowance for doubtful accounts of finance lease receivables (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Changes in the allowance for doubtful accounts of finance lease receivables [Abstract]
Beginning balance	₩ 862	₩ 1,133
Bad debt expense	128	0
Reversal of allowance for doubtful accounts	0	(271)
Ending balance	₩ 990	₩ 862

Employment benefit obligations

Employment benefit obligations (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Employment Benefits [Abstract]
Net defined benefit asset	₩ (7,231)	₩ (1,047)
Net defined benefit obligations	1,907,013	1,925,134
Other long-term employee benefit obligations	3,847	4,720
Employee benefits liabilities, net	₩ 1,903,629	₩ 1,928,807

Principal assumptions on actuar

Principal assumptions on actuarial valuation (Details) - ₩ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure - Principal assumptions on actuarial valuation [Abstract]
Discount rate	1.87%~2.12%	1.92%~2.05%
Future salary and benefit levels	4.28%	4.39%
Weighted average duration	10.77	10.95

Details of expense relating t_2

Details of expense relating to defined benefit plans (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure - Details of expense relating to defined benefit plans [Abstract]
Current service cost	₩ 509,520	₩ 440,300	₩ 369,899
Interest cost	83,248	83,619	87,687
Expected return on plan assets	(42,742)	(41,597)	(42,135)
Past service cost	(2,027)	301,442	0
Loss from settlement	0	(2,017)	(767)
Defined benefit	₩ 547,999	₩ 781,747	₩ 414,684

Details of expense relating t_3

Details of expense relating to defined benefit plans by nature (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure - Details of expense relating to defined benefit plans by nature [Abstract]
Defined benefit allocated to Cost of sales	₩ 397,442	₩ 580,623	₩ 308,672
Defined benefit allocated to Selling, general and administrative expense	94,846	120,455	51,903
Defined benefit allocated to others	55,711	80,669	54,109
Defined benefit	₩ 547,999	₩ 781,747	₩ 414,684

Defined benefit plan assets and

Defined benefit plan assets and liabilities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure - Defined benefit plan assets and liabilities [Abstract]
Present value of defined benefit obligation from funded plans	₩ 4,570,614	₩ 4,035,400
Fair value of plan assets	(2,670,832)	(2,111,313)
Net surplus (deficit) in plan	1,899,782	1,924,087
Present value of defined benefit obligation from unfunded plans	0	0
Net liabilities incurred from defined benefit plans	₩ 1,899,782	₩ 1,924,087

Net defined benefit liability (

Net defined benefit liability (asset) (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of defined benefit plans [Line Items]
Beginning balance		₩ 1,924,087
Changes in net defined benefit liability (asset)
Current service cost		509,520	₩ 440,300	₩ 369,899
Remeasurement component		84,775	(82,550)
Past service cost		(2,027)	301,442	0
Loss from settlement		0	(2,017)	(767)
Ending balance		1,899,782	1,924,087
Defined benefit obligation
Disclosure of defined benefit plans [Line Items]
Beginning balance		4,035,400	3,414,116
Changes in net defined benefit liability (asset)
Current service cost		509,520	440,300
Interest expense (income)	[1]	83,248	83,619
Remeasurement component		84,385	(93,736)
Past service cost		(2,027)	301,442
Loss from settlement		0	(2,018)
Actual payments		(139,956)	(108,057)
Others		44	(266)
Ending balance		4,570,614	4,035,400	3,414,116
Plan assets
Disclosure of defined benefit plans [Line Items]
Beginning balance		2,111,313	1,775,331
Changes in net defined benefit liability (asset)
Interest expense (income)		42,742	41,597
Remeasurement component		(390)	(11,186)
Contributions by the employers		582,275	348,386
Actual payments		(65,108)	(42,815)
Ending balance		₩ 2,670,832	₩ 2,111,313	₩ 1,775,331
[1]	The Company decided to include a performance incentive for management evaluation in the average wage during the previous year and recognized it as past service cost.

Details of the fair value of pl

Details of the fair value of plan assets (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of fair value of plan assets [Abstract]
Equity instruments	₩ 253,358	₩ 189,235
Debt instruments	822,582	648,265
Bank deposit	284,655	199,743
Others	1,310,237	1,074,070
Plan assets	₩ 2,670,832	₩ 2,111,313

Gain (loss) on remeasurement, n

Gain (loss) on remeasurement, net defined benefit liability (asset) (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Gain (loss) on remeasurement, net defined benefit liability (asset) [Abstract]
Actuarial gain from changes in financial assumptions	₩ (2,979)	₩ (2,916)
Experience adjustments	87,364	(90,820)
Expected return	390	11,186
Total loss (gain) on remeasurement, net defined benefit liability (asset)	₩ 84,775	₩ (82,550)

Provisions (Details)

Provisions (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of changes in other provisions
Beginning balance	₩ 21,670,769	₩ 18,180,546
Changes in other provisions
Increase in provision	3,911,898	5,619,551
Payment	(3,018,343)	(2,053,071)
Reversal of unused amount	10,640	(86,804)
Others	(47,728)	10,547
Ending balance	22,527,236	21,670,769
Current Provisions
Reconciliation of changes in other provisions
Beginning balance	2,604,721	1,594,798
Changes in other provisions
Ending balance	2,451,664	2,604,721
Noncurrent Provisions
Reconciliation of changes in other provisions
Beginning balance	19,066,048	16,585,748
Changes in other provisions
Ending balance	20,075,572	19,066,048
Provisions for employment benefits
Reconciliation of changes in other provisions
Beginning balance	975,619	976,347
Changes in other provisions
Increase in provision	1,078,382	900,033
Payment	(1,028,218)	(879,980)
Reversal of unused amount	0	(20,781)
Others	(1,209)	0
Ending balance	1,024,574	975,619
Provisions for employment benefits | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	975,619	976,347
Changes in other provisions
Ending balance	1,024,574	975,619
Litigation provisions
Reconciliation of changes in other provisions
Beginning balance	88,398	77,793
Changes in other provisions
Increase in provision	81,990	59,366
Payment	(34,662)	(17,236)
Reversal of unused amount	(22,724)	(31,525)
Others	0	0
Ending balance	113,002	88,398
Litigation provisions | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	39,177	40,157
Changes in other provisions
Ending balance	46,287	39,177
Litigation provisions | Noncurrent Provisions
Reconciliation of changes in other provisions
Beginning balance	49,221	37,636
Changes in other provisions
Ending balance	66,715	49,221
Provisions For Nuclear Plants Restoration
Reconciliation of changes in other provisions
Beginning balance	15,994,039	13,388,134
Changes in other provisions
Increase in provision	1,028,580	2,639,562
Payment	(47,735)	(33,657)
Reversal of unused amount	0	0
Others	0	0
Ending balance	16,974,884	15,994,039
Provisions For Nuclear Plants Restoration | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	0	0
Changes in other provisions
Ending balance	0	0
Provisions For Nuclear Plants Restoration | Noncurrent Provisions
Reconciliation of changes in other provisions
Beginning balance	15,994,039	13,388,134
Changes in other provisions
Ending balance	16,974,884	15,994,039
Spent fuel recovery provisions
Reconciliation of changes in other provisions
Beginning balance	1,355,280	1,291,354
Changes in other provisions
Increase in provision	394,642	440,029
Payment	(395,921)	(376,103)
Reversal of unused amount	0	0
Others	0	0
Ending balance	1,354,001	1,355,280
Spent fuel recovery provisions | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	401,741	0
Changes in other provisions
Ending balance	487,529	401,741
Spent fuel recovery provisions | Noncurrent Provisions
Reconciliation of changes in other provisions
Beginning balance	953,539	1,291,354
Changes in other provisions
Ending balance	866,472	953,539
Radioactive waste recovery provisions
Reconciliation of changes in other provisions
Beginning balance	1,888,082	1,685,008
Changes in other provisions
Increase in provision	71,529	209,551
Payment	(67,998)	(6,787)
Reversal of unused amount	0	0
Others	0	310
Ending balance	1,891,613	1,888,082
Radioactive waste recovery provisions | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	77,053	4,310
Changes in other provisions
Ending balance	46,369	77,053
Radioactive waste recovery provisions | Noncurrent Provisions
Reconciliation of changes in other provisions
Beginning balance	1,811,029	1,680,698
Changes in other provisions
Ending balance	1,845,244	1,811,029
PCBs recovery provisions
Reconciliation of changes in other provisions
Beginning balance	152,981	147,668
Changes in other provisions
Increase in provision	3,017	14,251
Payment	(14,839)	(8,938)
Reversal of unused amount	(22,140)	0
Others	0	0
Ending balance	119,019	152,981
PCBs recovery provisions | Noncurrent Provisions
Reconciliation of changes in other provisions
Beginning balance	152,981	147,668
Changes in other provisions
Ending balance	119,019	152,981
Other recovery provisions
Reconciliation of changes in other provisions
Beginning balance	10,773	10,477
Changes in other provisions
Increase in provision	15,280	2,020
Payment	0	(2,033)
Reversal of unused amount	0
Others	(213)	309
Ending balance	25,840	10,773
Other recovery provisions | Noncurrent Provisions
Reconciliation of changes in other provisions
Beginning balance	10,773	10,477
Changes in other provisions
Ending balance	25,840	10,773
Power plant regional support program provisions
Reconciliation of changes in other provisions
Beginning balance	140,133	137,668
Changes in other provisions
Increase in provision	39,445	41,341
Payment	(42,935)	(48,390)
Reversal of unused amount	0	0
Others	7,629	9,514
Ending balance	144,272	140,133
Power plant regional support program provisions | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	140,133	137,668
Changes in other provisions
Ending balance	144,272	140,133
Transmission regional support program provisions
Reconciliation of changes in other provisions
Beginning balance	139,785	151,698
Changes in other provisions
Increase in provision	151,796	169,616
Payment	(194,686)	(181,529)
Reversal of unused amount	0	0
Others	0	0
Ending balance	96,895	139,785
Transmission regional support program provisions | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	139,785	151,698
Changes in other provisions
Ending balance	96,895	139,785
Provisions for tax
Reconciliation of changes in other provisions
Beginning balance	0	6,845
Changes in other provisions
Increase in provision	0	0
Payment	(24)	0
Reversal of unused amount	25	(6,847)
Others	(1)	2
Ending balance	0	0
Provisions for tax | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	0	6,845
Changes in other provisions
Ending balance	0	0
Provisions for tax | Noncurrent Provisions
Reconciliation of changes in other provisions
Beginning balance	0	0
Changes in other provisions
Ending balance	0	0
Provisions for financial guarantee
Reconciliation of changes in other provisions
Beginning balance	81,357	15,586
Changes in other provisions
Increase in provision	11,303	83,910
Payment	(20,962)	(16,589)
Reversal of unused amount	(5,317)	(1,551)
Others	(27)	1
Ending balance	66,354	81,357
Provisions for financial guarantee | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	111	1,320
Changes in other provisions
Ending balance	22,250	111
Provisions for financial guarantee | Noncurrent Provisions
Reconciliation of changes in other provisions
Beginning balance	81,246	14,266
Changes in other provisions
Ending balance	44,104	81,246
Provisions for RPS
Reconciliation of changes in other provisions
Beginning balance	2,889	93,919
Changes in other provisions
Increase in provision	494,199	222,119
Payment	(487,962)	(313,149)
Reversal of unused amount	0	0
Others	0	0
Ending balance	9,126	2,889
Provisions for RPS | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	2,889	93,919
Changes in other provisions
Ending balance	9,126	2,889
Provisions for greenhouse gas emissions obligations
Reconciliation of changes in other provisions
Beginning balance	682,459	136,187
Changes in other provisions
Increase in provision	331,684	724,002
Payment	(633,482)	(152,463)
Reversal of unused amount	65,389	(25,267)
Others	(52,929)	0
Ending balance	393,121	682,459
Provisions for greenhouse gas emissions obligations | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	682,459	136,187
Changes in other provisions
Ending balance	393,121	682,459
Others
Reconciliation of changes in other provisions
Beginning balance	158,974	61,862
Changes in other provisions
Increase in provision	210,051	113,751
Payment	(48,919)	(16,217)
Reversal of unused amount	(4,593)	(833)
Others	(978)	411
Ending balance	314,535	158,974
Others | Current Provisions
Reconciliation of changes in other provisions
Beginning balance	145,754	46,347
Changes in other provisions
Ending balance	181,241	145,754
Others | Noncurrent Provisions
Reconciliation of changes in other provisions
Beginning balance	13,220	15,515
Changes in other provisions
Ending balance	₩ 133,294	₩ 13,220

Changes in government grants (D

Changes in government grants (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Changes in government grants
Beginning balance	₩ (506,176)	₩ (522,476)
Receipt	(41,209)	(21,705)
Acquisitions	8,783	12,338
Offset the items of depreciation expense and others	36,213	37,331
Disposals	2,534	3,196
Others	(11,355)	(14,860)
Ending balance	(511,210)	(506,176)
Cash
Changes in government grants
Beginning balance	0	0
Receipt	(41,209)	(21,705)
Acquisitions	0	0
Offset the items of depreciation expense and others	0	0
Disposals	0	0
Others	41,209	21,705
Ending balance	0	0
Land
Changes in government grants
Beginning balance	(21,817)	(21,968)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	0	0
Disposals	2	151
Others	(1,660)	0
Ending balance	(23,475)	(21,817)
Buildings
Changes in government grants
Beginning balance	(61,920)	(63,189)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	5,206	6,214
Disposals	0	0
Others	(517)	(4,945)
Ending balance	(57,231)	(61,920)
Structures
Changes in government grants
Beginning balance	(186,554)	(190,854)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	9,526	9,373
Disposals	2,032	2,405
Others	(5,013)	(7,478)
Ending balance	(180,009)	(186,554)
Machinery
Changes in government grants
Beginning balance	(158,907)	(173,242)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	17,468	17,993
Disposals	496	635
Others	(16,842)	(4,293)
Ending balance	(157,785)	(158,907)
Vehicles
Changes in government grants
Beginning balance	(2,275)	(4,220)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	2,064	2,170
Disposals	4	5
Others	(425)	(230)
Ending balance	(632)	(2,275)
Equipment
Changes in government grants
Beginning balance	(241)	(418)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	149	262
Disposals	0	0
Others	(135)	(85)
Ending balance	(227)	(241)
Tools
Changes in government grants
Beginning balance	(403)	(675)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	243	281
Disposals	0	0
Others	(79)	(9)
Ending balance	(239)	(403)
Construction in progress
Changes in government grants
Beginning balance	(61,211)	(54,740)
Receipt	0	0
Acquisitions	8,783	12,338
Offset the items of depreciation expense and others	0	0
Disposals	0	0
Others	(26,698)	(18,809)
Ending balance	(79,126)	(61,211)
Finance lease assets
Changes in government grants
Beginning balance	0	(26)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	0	0
Disposals	0	0
Others	0	26
Ending balance	0	0
Investment properties
Changes in government grants
Beginning balance	(13)	(50)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	1	1
Disposals	0	0
Others	(17)	36
Ending balance	(29)	(13)
Software
Changes in government grants
Beginning balance	(235)	(420)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	99	202
Disposals	0	0
Others	0	(17)
Ending balance	(136)	(235)
Development expenditures
Changes in government grants
Beginning balance	(1,492)	(2,110)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	1,453	833
Disposals	0	0
Others	(5,004)	(215)
Ending balance	(5,043)	(1,492)
Intangible assets under development
Changes in government grants
Beginning balance	(11,029)	(10,564)
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	0	0
Disposals	0	0
Others	3,826	(465)
Ending balance	(7,203)	(11,029)
Others
Changes in government grants
Beginning balance	(79)	0
Receipt	0	0
Acquisitions	0	0
Offset the items of depreciation expense and others	4	2
Disposals	0	0
Others	0	(81)
Ending balance	₩ (75)	₩ (79)

Deferred Revenues (Details)

Deferred Revenues (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Deferred Revenue [Abstract]
Deferred Revenue, Beginning Balance	₩ 9,201,538	₩ 8,606,563
Increase during the current year / period	1,310,128	1,199,783
Recognized as revenue during the current year / period	(643,477)	(604,808)
Deferred Revenue, Ending Balance	₩ 9,868,189	₩ 9,201,538

Non-financial Liabilities (Deta

Non-financial Liabilities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure - Other liabilities [Line Items]
Deferred revenue	₩ 9,868,189	₩ 9,201,538	₩ 8,606,563
Other Current Liabilities
Disclosure - Other liabilities [Line Items]
Advances received	3,693,043	3,825,240
Unearned revenue	35,068	30,988
Deferred revenue	625,596	590,928
Withholdings	257,059	160,977
Other nonfincial liabilities	1,360,684	1,080,220
Total	5,971,450	5,688,353
Other Noncurrent Liabilities
Disclosure - Other liabilities [Line Items]
Advances received	331,596	192,863
Unearned revenue	6,122	6,589
Deferred revenue	9,242,593	8,610,610
Withholdings	9,909	10,901
Other nonfincial liabilities	71,721	13,489
Total	₩ 9,661,941	₩ 8,834,452

Details of shares issued (Detai

Details of shares issued (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2020	Dec. 31, 2019
Common shares [Line Items]
Common shares		₩ 3,209,820	₩ 3,209,820
Owned by government
Common shares [Line Items]
Common shares	[1]	1,640,385	1,640,385
Owned by others
Common shares [Line Items]
Common shares		₩ 1,569,435	₩ 1,569,435
[1]	Korea Development Bank's interest of KRW1,056,176 million is included.

Details in number of outstandin

Details in number of outstanding capital stock (Details) - ₩ / shares	Dec. 31, 2020	Dec. 31, 2019
Disclosure of classes of share capital [Abstract]
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

Details of share premium (Detai

Details of share premium (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Share premium [Abstract]
Share premium	₩ 843,758	₩ 843,758

Retained Earnings (Details)

Retained Earnings (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Retained Earnings Note Disclosure [Abstract]
Legal reserves	[1]	₩ 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	[2]	330,000	330,000
Reserve for business expansion		26,361,617	28,967,976
Reserve for equalizing dividends		210,000	210,000
Voluntary reserves		32,179,066	34,785,425
Retained earnings before appropriations		17,349,625	12,811,798
Retained earnings		₩ 51,133,601	₩ 49,202,133	₩ 51,519,119
[1]	The KEPCO Act requires KEPCO to appropriate a legal reserve equal to at least 20 percent of net income for each accounting period until the reserve equals 50 percent of KEPCO's common stock. The legal reserve is not available for cash dividends; however, this reserve may be credited to paid-in capital or offset against accumulated deficit by the resolution of the shareholders.
[2]	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 (D

Changes in retained earnings (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of Changes in retained earnings [Abstract]
Beginning balance	₩ 49,202,133	₩ 51,519,119
Effect of change in accounting policy	0	0
Net profit (loss) for the period attributed to owner of the Company	1,991,347	(2,345,517)	₩ (1,314,567)
Changes in equity method retained earnings
Beginning balance	(2,820)	3,969
Ending balance	361	(2,820)	3,969
Changes	3,181	(6,789)
Remeasurements of defined benefit liability, net of tax	(62,857)	36,160
Transfer of gain (loss) on valuation of financial assets through other comprehensive income	0	(840)
Transactions between consolidated entities	(203)	0
Dividend paid	0	0	(507,152)
Ending balance	₩ 51,133,601	₩ 49,202,133	₩ 51,519,119

Dividends Paid (Details)

Dividends Paid (Details) - KRW (₩) ₩ / shares in Units, ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Dividends [Abstract]
Number of shares issued	641,964,077	641,964,077	641,964,077
Treasury Stock, Common, Shares	0	0	0
Number of shares eligible for dividends	641,964,077	641,964,077	641,964,077
Dividends paid per share (In won)	₩ 0	₩ 0	₩ 790
Dividend paid	₩ 0	₩ 0	₩ 507,152

Changes in Reserve of remeasure

Changes in Reserve of remeasurements (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of Changes in Reserve of remeasurements [Abstract]
Beginning balance	₩ (117,779)	₩ (219,381)
Changes	(77,828)	76,395
Income tax effect	14,971	(40,235)	₩ 53,703
Transfer to reserve for business expansion	11,402	65,442
Ending balance	₩ (169,234)	₩ (117,779)	₩ (219,381)

Statement of Appropriation of_3

Statement of Appropriation of retained earnings (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Statement of Appropriation of Retained Earnings [Abstract]
Unappropriated retained earnings carried over from prior years	₩ 0	₩ 0
Effect of change in accounting policy	0	0
Net income (loss)	1,951,498	(2,594,957)
Remeasurements of defined benefit plans	(67,119)	(11,402)
Retained earnings before appropriations	1,884,379	(2,606,359)
Transfer from voluntary reserves	0	2,606,359
Subtotal (I+II)	1,884,379	0
Dividends (government, individual)(Amount of dividends per share (%) : Current year - W1,216 (24.32%) Prior year - W 0 (0%))	(780,628)	0
Reserve for business expansion	(1,103,751)	0
Appropriations of retained earnings	(1,884,379)
Unappropriated retained earnings to be carried over to subsequent year	₩ 0	₩ 0

Hybrid bond (Details)

Hybrid bond (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
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	Dec. 7, 2012
Maturity date	Dec. 6, 2042	Dec. 6, 2042
Yield (%)	4.38%	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	Dec. 7, 2012
Maturity date	Dec. 6, 2042	Dec. 6, 2042
Yield (%)	4.44%	4.44%
Amount	₩ 230,000	₩ 230,000
Expense of issuance
Hybrid bond [Line Items]
Amount	₩ (1,090)	₩ (1,090)

Other Components Of Equity (Det

Other Components Of Equity (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Changes In Other Components Of Equity [Line Items]
Beginning balance	₩ 14,240,607	₩ 14,171,228
Ending balance	14,109,501	14,240,607
Other capital surplus
Changes In Other Components Of Equity [Line Items]
Beginning balance	1,226,364	1,234,825
Issuance of share capital of subsidiary	(148)	0
Others	(2,111)	(8,461)
Ending balance	1,224,105	1,226,364
Gains on disposal of Treasury stocks
Changes In Other Components Of Equity [Line Items]
Beginning balance	387,524	387,524
Issuance of share capital of subsidiary	0	0
Others	0	0
Ending balance	387,524	387,524
Other Capital Surplus Other Than Gainson Disposal Of Treasury Stocks
Changes In Other Components Of Equity [Line Items]
Beginning balance	838,840	847,301
Issuance of share capital of subsidiary	(148)	0
Others	(2,111)	(8,461)
Ending balance	836,581	838,840
Accumulated other comprehensive loss
Changes In Other Components Of Equity [Line Items]
Beginning balance	(280,730)	(358,570)
Changes in the unrealized fair value of financial assets at FVOCI, net of tax	(8,533)	(10,891)
Shares in other comprehensive loss of associates and joint ventures, net of tax	(132,805)	19,343
Foreign currency translation of foreign operations, net of tax	(46,032)	55,347
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax	58,523	14,041
Ending balance	(409,577)	(280,730)
Financial assets at fair value through other comprehensive income
Changes In Other Components Of Equity [Line Items]
Beginning balance	(92,599)	(81,708)
Changes in the unrealized fair value of financial assets at FVOCI, net of tax	(8,533)	(10,891)
Ending balance	(101,132)	(92,599)
Shares in other comprehensive Income (loss) of investments in associates and joint ventures
Changes In Other Components Of Equity [Line Items]
Beginning balance	142,896	123,553
Shares in other comprehensive loss of associates and joint ventures, net of tax	(132,805)	19,343
Ending balance	10,091	142,896
Reserve for overseas operations translation credit
Changes In Other Components Of Equity [Line Items]
Beginning balance	(294,898)	(350,245)
Foreign currency translation of foreign operations, net of tax	(46,032)	55,347
Ending balance	(340,930)	(294,898)
Reserve for gain (loss) on valuation of derivatives
Changes In Other Components Of Equity [Line Items]
Beginning balance	(36,129)	(50,170)
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax	58,523	14,041
Ending balance	22,394	(36,129)
Other equity
Changes In Other Components Of Equity [Line Items]
Beginning balance	13,294,973	13,294,973
Ending balance	13,294,973	13,294,973
Statutory revaluation reserve
Changes In Other Components Of Equity [Line Items]
Beginning balance	13,295,098	13,295,098
Ending balance	13,295,098	13,295,098
Changes in other equity
Changes In Other Components Of Equity [Line Items]
Beginning balance	(125)	(125)
Ending balance	₩ (125)	₩ (125)

Timing of revenue recognition (

Timing of revenue recognition (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of performance obligations [Line Items]
Total revenue from external customers		₩ 57,925,837	₩ 58,568,082	₩ 60,033,062
Domestic
Disclosure of performance obligations [Line Items]
Total revenue from external customers		56,774,578	56,942,128	57,799,991
Domestic | Performance obligations satisfied at point in time
Disclosure of performance obligations [Line Items]
Total revenue from external customers		56,380,608	56,609,330	57,514,866
Domestic | Performance obligations satisfied over time
Disclosure of performance obligations [Line Items]
Total revenue from external customers		393,970	332,798	285,125
Overseas
Disclosure of performance obligations [Line Items]
Total revenue from external customers	[1]	1,151,259	1,625,954	2,233,071
Overseas | Performance obligations satisfied at point in time
Disclosure of performance obligations [Line Items]
Total revenue from external customers		303,704	285,546	382,938
Overseas | Performance obligations satisfied over time
Disclosure of performance obligations [Line Items]
Total revenue from external customers		₩ 847,555	₩ 1,340,408	₩ 1,850,133
[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 (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Expenses by nature [Line Items]
Raw materials used	₩ 13,544,827	₩ 17,084,029	₩ 19,537,928
Salaries	5,278,637	4,609,976	4,236,623
Retirement benefits expense	561,996	809,739	440,612
Welfare and benefit expense	639,390	563,945	596,572
Insurance expense	103,308	106,129	106,057
Depreciation	11,369,496	10,966,756	9,898,386
Amortization of intangible assets	170,466	156,915	118,938
Bad debt expense	20,648	(12,719)	39,784
Commission	744,322	1,011,710	1,189,284
Advertising expense	37,720	44,305	40,313
Training expense	18,108	24,077	20,373
Vehicle maintenance expense	16,596	17,177	17,957
Publishing expense	7,201	6,837	6,837
Business promotion expense	7,334	7,019	6,645
Rent expense	227,410	216,918	213,983
Telecommunication expense	18,647	19,485	106,073
Transportation expense	11,369	5,420	5,223
Taxes and dues	555,031	540,350	486,741
Expendable supplies expense	44,995	39,681	38,010
Water, light and heating expense	42,958	44,245	47,269
Repairs and maintenance expense	2,544,901	2,298,854	2,219,248
Ordinary development expense	700,642	735,715	723,888
Travel expense	71,689	84,233	81,427
Clothing expense	22,950	16,908	14,476
Survey and analysis expense	4,572	4,797	4,634
Membership fee	14,404	13,699	12,606
Power purchase	15,725,220	18,269,732	18,307,289
Disclosure - Other selling and administrative expenses
Others	1,978,202	2,763,479	2,318,435
General and administrative expenses	2,678,443	2,669,576	2,627,890
Cost of sales	51,804,596	57,779,835	58,207,721
Total expenses, by nature	54,483,039	60,449,411	60,835,611
Selling and administrative expense
Expenses by nature [Line Items]
Raw materials used	0	0	0
Salaries	1,095,183	775,204	757,819
Retirement benefits expense	103,967	157,272	65,107
Welfare and benefit expense	155,071	120,463	132,089
Insurance expense	10,178	12,427	12,181
Depreciation	218,103	232,510	214,499
Amortization of intangible assets	87,086	76,547	54,153
Bad debt expense	20,648	(12,719)	39,784
Commission	368,275	632,849	714,096
Advertising expense	29,559	34,453	30,894
Training expense	5,196	7,174	6,277
Vehicle maintenance expense	9,435	9,525	10,148
Publishing expense	3,677	3,414	3,307
Business promotion expense	3,614	3,038	2,785
Rent expense	36,337	40,505	42,851
Telecommunication expense	8,686	8,451	23,505
Transportation expense	1,007	865	686
Taxes and dues	62,828	58,666	46,424
Expendable supplies expense	8,029	6,682	6,166
Water, light and heating expense	11,749	11,867	12,629
Repairs and maintenance expense	79,185	88,576	62,580
Ordinary development expense	197,436	224,463	215,494
Travel expense	10,793	15,652	14,363
Clothing expense	14,834	9,369	10,108
Survey and analysis expense	826	848	705
Membership fee	1,274	969	1,043
Power purchase	0	0	0
Disclosure - Other selling and administrative expenses
Accommodation development expenses	30,889	53,945	52,822
Miscellaneous wages	45,887	39,794	32,447
Litigation and filing expenses	19,341	21,768	12,853
Compensation for damages	8,374	(1,924)	19,193
Outsourcing expenses	3,610	3,293	3,036
Reward expenses	3,228	2,858	2,713
Overseas market development expenses	1,218	1,997	1,361
Others	22,920	28,775	23,772
Others	135,467	150,506	148,197
General and administrative expenses	2,678,443	2,669,576	2,627,890
Total expenses, by nature	₩ 2,678,443	₩ 2,669,576	₩ 2,627,890

Other Income and Expense (Detai

Other Income and Expense (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other non-operating income [Abstract]
Reversal of other provisions	₩ 25,826	₩ 16,542	₩ 12,700
Reversal of allowance for doubtful accounts	2,465	0	143
Gains on government grants	269	281	482
Gains on assets contributed	24,324	6,921	17,336
Gains on liabilities exempted	1,314	916	10,303
Compensation and reparations revenue	95,407	113,292	89,901
Revenue from research contracts	4,001	5,276	6,818
Income related to transfer of assets from customers	643,477	604,808	594,548
Rental income	193,567	191,088	186,631
Others of Other Income	45,798	58,849	51,032
Refund of claim for rectification	11,880	1,969	8,933
Adjustment of research project	2,150	3,294	2,267
Maintenance expenses on lease building	2,785	153	176
Training expenses	3,852	3,167	3,220
Deposit redemption	314	436	7
Reversal of expenses on litigation	620	9,926	753
Revenue on royalty fee	0	0	6,909
Reimbursement of insurance fee	22	610	7,145
Gains on guarantee contracts	134	135	39
Miscellaneous other non-operating income	24,041	39,159	21,583
Other non-operating income	1,036,448	997,973	969,894
Other non-operating expense
Compensation and indemnification expense	11,959	403	23,437
Accretion expenses of other provisions	17,991	7,939	41,924
Depreciation expenses on investment properties	1,453	5,069	923
Depreciation expenses on idle assets	6,604	6,542	6,547
Other bad debt expense	32,503	29,348	17,827
Donations	316,981	64,752	63,743
Others of Other Expense	30,229	127,860	76,929
Operating expenses related to the idle assets	46	49	47
Research grants	91	399	461
Supporting expenses on farming and fishing village	16,115	13,991	13,537
Operating expenses on fitness center	5,101	5,234	4,788
Expenses on adjustment of research and development grants	720	554	404
Taxes and dues	253	188	199
Expenses on R&D supporting	242	67	53
Miscellaneous other non-operating expense	7,661	107,378	57,440
Other non-operating expense	₩ 417,720	₩ 241,913	₩ 231,330

Other Gains (Losses) (Details)

Other Gains (Losses) (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other gains
Gains on disposal of property, plant and equipment	₩ 93,195	₩ 43,784	₩ 98,077
Gains on disposal of intangible assets	1,556	206	12
Reversal of impairment loss on property, plant and equipment	7,805	16,692	0
Reversal of impairment loss on intangible assets	0	0	17
Gains on foreign currency translation	8,917	16,340	14,905
Gains on foreign currency transaction	61,865	53,152	47,297
Gains on insurance proceeds	43,800	17,410	0
Miscellaneous Other Gains	322,379	238,688	221,556
Gains on disposal of inventories	3,373	3,424	6,350
Gains on proxy collection of TV license fee	41,438	41,013	40,450
Gains on compensation of impaired electric poles	978	1,372	1,166
Gains on compensation for infringement on contract	0	0	3,648
Gains on harbor facilities dues	2,231	3,741	3,803
Gains on technical fees	4,826	3,044	2,026
Reversal of occupation development training fees	352	1,472	1,602
Gains on disposal of waste	6,927	5,317	4,232
Gains on insurance	0	812	22,382
Gains on tax rebate	772	341	542
Gains on other commission	1,643	1,111	4,347
Gains on disposal of assets held-for-sale	0	23,778	0
Others of Miscellaneous Other Gains	259,839	153,263	131,008
Other losses
Losses on disposal of property, plant and equipment	(162,725)	(72,508)	(60,704)
Losses on disposal of intangible assets	(392)	(827)	(43)
Losses on valuation of other non-current assets	(241)	0	0
Impairment loss on property, plant and equipment	(80,413)	(50,034)	(710,162)
Impairment loss on intangible assets	(3,599)	(513,609)	(8,112)
Impairment loss on other non-current assets	0	(49,620)	(87,024)
Losses on foreign currency translation	(17,664)	(8,757)	(7,678)
Losses on foreign currency transaction	(49,694)	(55,283)	(65,366)
Miscellaneous Other Losses	(189,695)	(217,892)	(63,899)
Losses on valuation of inventories	4,998	3,127	1,953
Losses on disposal of inventories	37,644	10,456	3,555
Losses due to disaster	16,814	7,635	2,129
Losses on rounding adjustment of electric charge surtax	1,276	1,268	1,265
Others Of Miscellaneous Other Losses	128,963	195,406	54,997
Net other gains	₩ 35,094	₩ (582,258)	₩ (621,124)

Finance Income (Details)

Finance Income (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest Income
Cash and cash equivalents	₩ 9,419	₩ 42,861	₩ 40,704
Financial assets at fair value through profit or loss	19,114	29,411	21,713
Financial assets at amortized cost	612	539	89
Loans	26,232	63,448	21,925
Short-term financial instrument	25,540	49,070	41,025
Long-term financial instrument	10,406	12,794	7,920
Other financial assets	228	54	1
Trade and other receivables	151,035	69,941	90,390
Total Interest Income	242,586	268,118	223,767
Dividends income	7,316	13,838	12,777
Gains on disposal of financial assets	11,992	3,866	1,838
Gains on valuation of financial assets at fair value through profit or loss	12,904	5,575	8,495
Gains on valuation of derivatives	57,563	362,735	199,943
Gains on transaction of derivatives	146,448	157,961	179,745
Gains on foreign currency translation of Finance Income	1,005,961	175,839	143,254
Gains on foreign currency transaction	24,009	21,774	27,051
Other financial assets	1,470	0	0
Total Finance Income	₩ 1,510,249	₩ 1,009,706	₩ 796,870

Finance Expenses (Details)

Finance Expenses (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest Expense
Trade and other payables	₩ 88,757	₩ 94,019	₩ 42,830
Short-term borrowings	29,358	42,971	32,545
Long-term borrowings	118,678	119,806	92,243
Debt securities	1,805,253	1,827,511	1,771,544
Other financial liabilities	540,867	558,464	505,112
Interest Expense (Before Capitalizing borrowing costs)	2,582,913	2,642,771	2,444,274
Less: Capitalized borrowing costs	(587,488)	(595,960)	(575,816)
Interest expense	1,995,425	2,046,811	1,868,458
Losses on sale of financial assets	648	2,106	1
Losses on valuation of financial assets at fair value through profit or loss	7,396	4,513	6,616
Losses on valuation of derivatives	513,278	45,385	46,740
Losses on transaction of derivatives	81,055	71,546	32,448
Losses on foreign currency translation	215,047	553,731	393,859
Losses on foreign currency transaction	79,103	55,509	121,763
Losses on repayment of financial liabilities	35	0	0
Other Finance Expenses	4,456	2,555	858
Total Finance Expense	₩ 2,896,443	₩ 2,782,156	₩ 2,470,743

Income tax expense (benefit) (D

Income tax expense (benefit) (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income tax expense (benefit) [Abstract]
Current income tax expense	₩ 658,909	₩ 308,480	₩ 286,375
Payment of income tax	671,179	538,223	378,715
Adjustment in respect of prior years due to change in estimate	(63,756)	(176,440)	(195,648)
Current income tax directly recognized in equity	51,486	(53,302)	101,528
Income tax directly adjusted to shareholders' equity (except for accumulated other comprehensive income (loss))	4,273	3,432
Dividends of hybrid bond	4,273	3,432	4,273
Income tax recognized as other comprehensive income (loss)	47,213	(56,733)
Gain(loss) on valuation of financial assets at fair value through other comprehensive income	19,447	(4,217)	35,798
Net change in the unrealized fair value of derivatives using cash flow hedge accounting	(47,231)	(15,642)	6,639
Remeasurements of defined benefit liability	14,971	(40,235)	53,703
Investments in associates	35,714	4,275	6,592
Others	24,311	(914)	(5,477)
Effect of change in accounting policy	0	0	1,780
Deferred income tax expense (benefit)	240,155	(1,310,783)	(1,112,696)
Generation and realization of temporary differences	(77,985)	(636,984)	(495,658)
Changes of unrecognized tax losses, tax credit and temporary differences for prior periods	(10,471)	(22,469)	(28,509)
Changes in deferred tax on tax losses carryforwards	296,070	(582,011)	(572,305)
Tax credit carryforwards	32,541	(71,306)	(16,224)
Amount due to change in tax rate or regulations	0	1,987	0
Income tax expense (benefit)	₩ 899,064	₩ (1,002,303)	₩ (826,321)

Income tax expense _ Reconcilia

Income tax expense : Reconciliation between actual income tax expense and amount computed by applying the statutory tax rate to income before income taxes (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019		Dec. 31, 2018
Disclosure - Income tax expense calculated by multiplying net income before tax with the tax rate [Abstract]
Profit (loss) before income tax		₩ 2,991,533	₩ (3,265,838)		₩ (2,000,819)
Income tax expense (benefit) computed at applicable tax rate	[1]	822,672	(898,105)		(550,225)
Adjustments		140,148	72,243		(80,448)
Effect of applying gradual tax rate		(10,362)	10,362		(1,408)
Effect of non-taxable income		(13,593)	(9,990)		(1,705)
Effect of non-deductible expenses		46,776	12,197		40,151
Effect of tax losses that are not recognized as deferred tax asset		0	57,490		2,086
Effects of tax credits and deduction		(63,753)	(76,983)		(39,471)
Recognition (reversal) of unrecognized deferred tax asset, net		(10,471)	(22,469)		(28,509)
Effect of change in deferred tax due to change in tax rate		(17,590)	16,848		261
Deduction of deferred tax assets		55,682	0		0
Deferred income tax related to investments in subsidiaries, associates and joint ventures		102,137	147,598		(52,618)
Others, net		51,322	(62,810)		765
Adjustment in respect of prior years due to change in estimate		(63,756)	(176,440)		(195,648)
Income tax expense (benefit)		₩ 899,064	₩ (1,002,303)		₩ (826,321)
Effective tax rate		30.05%		[2]		[2]
[1]	Applicable tax rate is 27.5% as of December 31, 2018, 2019 and 2020.
[2]	The effective tax rate for the year ended December 31, 2018 and 2019 is not calculated due to income tax benefit.

Deferred tax expenses by origin

Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		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		₩ (7,126,946)	₩ (8,383,548)
Amounts recognized in profit or loss		(291,641)	1,351,632
Amount recognized in other comprehensive income (loss)		47,213	(56,733)
Amounts recognized directly in equity		4,273	3,432
Others	[1]	0	(41,729)
Ending balance		(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		(8,382,980)	(8,992,509)
Amounts recognized in profit or loss		(69,278)	704,559
Amount recognized in other comprehensive income (loss)		47,213	(56,733)
Amounts recognized directly in equity		4,273	3,432
Others	[1]	0	(41,729)
Ending balance		(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		648,847	594,541
Amounts recognized in profit or loss		14,566	94,541
Amount recognized in other comprehensive income (loss)		26,374	(40,235)
Amounts recognized directly in equity		0	0
Others	[1]	0	0
Ending balance		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		(999)	39,461
Amounts recognized in profit or loss		63,817	(23,977)
Amount recognized in other comprehensive income (loss)		(47,231)	(15,642)
Amounts recognized directly in equity		0	(841)
Others	[1]	0	0
Ending balance		15,587	(999)
Investments in associates and subsidiaries
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance		(8,665,727)	(8,666,871)
Amounts recognized in profit or loss		(38,002)	(3,131)
Amount recognized in other comprehensive income (loss)		35,714	4,275
Amounts recognized directly in equity		0	0
Others	[1]	0	0
Ending balance		(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		(7,115,218)	(6,522,778)
Amounts recognized in profit or loss		(598,231)	(592,440)
Amount recognized in other comprehensive income (loss)		0	0
Amounts recognized directly in equity		0	0
Others	[1]	0	0
Ending balance		(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		(160,443)	(453,074)
Amounts recognized in profit or loss		(50,977)	292,631
Amount recognized in other comprehensive income (loss)		0	0
Amounts recognized directly in equity		0	0
Others	[1]	0	0
Ending balance		(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		(55,906)	6,055
Amounts recognized in profit or loss		24,740	(20,232)
Amount recognized in other comprehensive income (loss)		0	0
Amounts recognized directly in equity		0	0
Others	[1]	0	(41,729)
Ending balance		(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		341	19
Amounts recognized in profit or loss		(328)	322
Amount recognized in other comprehensive income (loss)		0	0
Amounts recognized directly in equity		0	0
Others	[1]	0	0
Ending balance		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		18,245	25,576
Amounts recognized in profit or loss		258	(3,114)
Amount recognized in other comprehensive income (loss)		19,447	(4,217)
Amounts recognized directly in equity		0	0
Others	[1]	0	0
Ending balance		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		213,003	219,742
Amounts recognized in profit or loss		(13,302)	(6,739)
Amount recognized in other comprehensive income (loss)		0	0
Amounts recognized directly in equity		0	0
Others	[1]	0	0
Ending balance		199,701	213,003
Provisions
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance		5,456,919	4,800,946
Amounts recognized in profit or loss		459,884	655,973
Amount recognized in other comprehensive income (loss)		0	0
Amounts recognized directly in equity		0	0
Others	[1]	0	0
Ending balance		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		59	59
Amounts recognized in profit or loss		(59)	0
Amount recognized in other comprehensive income (loss)		0	0
Amounts recognized directly in equity		0	0
Others	[1]	0	0
Ending balance		0	59
Other financial liabilities
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance		39,364	39,493
Amounts recognized in profit or loss		(13,238)	(4,402)
Amount recognized in other comprehensive income (loss)		0	0
Amounts recognized directly in equity		4,273	4,273
Others	[1]	0	0
Ending balance		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		57,961	27,080
Amounts recognized in profit or loss		(69,596)	30,881
Amount recognized in other comprehensive income (loss)		0	0
Amounts recognized directly in equity		0	0
Others	[1]	0	0
Ending balance		(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		57,607	58,756
Amounts recognized in profit or loss		(1,478)	(1,149)
Amount recognized in other comprehensive income (loss)		0	0
Amounts recognized directly in equity		0	0
Others	[1]	0	0
Ending balance		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		(4,376)	(2,914)
Amounts recognized in profit or loss		13,320	(1,462)
Amount recognized in other comprehensive income (loss)		0	0
Amounts recognized directly in equity		0	0
Others	[1]	0	0
Ending balance		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		(215,373)	(211,746)
Amounts recognized in profit or loss		(10,978)	(3,627)
Amount recognized in other comprehensive income (loss)		0	0
Amounts recognized directly in equity		0	0
Others	[1]	0	0
Ending balance		(226,351)	(215,373)
Others
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items]
Beginning balance		1,342,716	1,053,146
Amounts recognized in profit or loss		150,326	290,484
Amount recognized in other comprehensive income (loss)		12,909	(914)
Amounts recognized directly in equity		0	0
Others	[1]	0	0
Ending balance		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		1,256,034	608,961
Amounts recognized in profit or loss		(222,363)	647,073
Amount recognized in other comprehensive income (loss)		0	0
Amounts recognized directly in equity		0	0
Others	[1]	0	0
Ending balance		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		1,111,813	554,457
Amounts recognized in profit or loss		(218,739)	557,356
Amount recognized in other comprehensive income (loss)		0	0
Amounts recognized directly in equity		0	0
Others	[1]	0	0
Ending balance		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		36,695	17,848
Amounts recognized in profit or loss		(1,514)	18,847
Amount recognized in other comprehensive income (loss)		0	0
Amounts recognized directly in equity		0	0
Others	[1]	0	0
Ending balance		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		107,526	36,656
Amounts recognized in profit or loss		(2,110)	70,870
Amount recognized in other comprehensive income (loss)		0	0
Amounts recognized directly in equity		0	0
Others	[1]	0	0
Ending balance		₩ 105,416	₩ 107,526
[1]	'Others' include amount changed due to business combination. (see Note 51)

Deferred tax assets and liabili

Deferred tax assets and liabilities presented on a gross basis prior to any offsetting (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure - Deferred tax assets and liabilities presented on a gross basis prior to any offsetting [Abstract]
Deferred tax assets	₩ 1,733,146	₩ 1,437,829
Deferred tax liabilities	(9,100,247)	(8,564,775)
Net Deferred tax assets(liabilities)	₩ (7,367,101)	₩ (7,126,946)	₩ (8,383,548)

Details of deductible temporary

Details of deductible temporary differences, tax losses and unused tax credits not recognized in the deferred income tax assets (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [Abstract]
Deductible temporary differences	₩ 1,405,621	₩ 541,449

Assets Held-for-Sale (Details)

Assets Held-for-Sale (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2020	Dec. 31, 2019
Assets Held-for-Sale [Abstract]
Land		₩ 0	₩ 23,002
Buildings		1	193
Investments		0	4,921
Others	[1]	924	0
Assets Held-for-Sale		₩ 925	₩ 28,116
[1]	As DG Fairhaven Power, LLC were sold after the end of the reporting period, the assets of DG Fairhaven Power, LLC were classified as assets held-for-sale.

Expenses by nature (Details)

Expenses by nature (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Expenses by nature [Line Items]
Raw materials used	₩ 13,544,827	₩ 17,084,029	₩ 19,537,928
Salaries	5,278,637	4,609,976	4,236,623
Retirement benefits expense	561,996	809,739	440,612
Welfare and benefit expense	639,390	563,945	596,572
Insurance expense	103,308	106,129	106,057
Depreciation	11,369,496	10,966,756	9,898,386
Amortization of intangible assets	170,466	156,915	118,938
Bad debt expense	20,648	(12,719)	39,784
Commission	744,322	1,011,710	1,189,284
Advertising expense	37,720	44,305	40,313
Training expense	18,108	24,077	20,373
Vehicle maintenance expense	16,596	17,177	17,957
Publishing expense	7,201	6,837	6,837
Business promotion expense	7,334	7,019	6,645
Rental expense	227,410	216,918	213,983
Telecommunication expense	18,647	19,485	106,073
Transportation expense	11,369	5,420	5,223
Taxes and dues	555,031	540,350	486,741
Expendable supplies expense	44,995	39,681	38,010
Water, light and heating expense	42,958	44,245	47,269
Repairs and maintenance expense	2,544,901	2,298,854	2,219,248
Ordinary development expense	700,642	735,715	723,888
Travel expense	71,689	84,233	81,427
Clothing expense	22,950	16,908	14,476
Survey and analysis expense	4,572	4,797	4,634
Membership fee	14,404	13,699	12,606
Power purchase	15,725,220	18,269,732	18,307,289
Disclosure - Other selling and administrative expenses
Others	1,978,202	2,763,479	2,318,435
General and administrative expenses	2,678,443	2,669,576	2,627,890
Cost of sales	51,804,596	57,779,835	58,207,721
Total expenses, by nature	54,483,039	60,449,411	60,835,611
Selling and administrative expense
Expenses by nature [Line Items]
Raw materials used	0	0	0
Salaries	1,095,183	775,204	757,819
Retirement benefits expense	103,967	157,272	65,107
Welfare and benefit expense	155,071	120,463	132,089
Insurance expense	10,178	12,427	12,181
Depreciation	218,103	232,510	214,499
Amortization of intangible assets	87,086	76,547	54,153
Bad debt expense	20,648	(12,719)	39,784
Commission	368,275	632,849	714,096
Advertising expense	29,559	34,453	30,894
Training expense	5,196	7,174	6,277
Vehicle maintenance expense	9,435	9,525	10,148
Publishing expense	3,677	3,414	3,307
Business promotion expense	3,614	3,038	2,785
Rental expense	36,337	40,505	42,851
Telecommunication expense	8,686	8,451	23,505
Transportation expense	1,007	865	686
Taxes and dues	62,828	58,666	46,424
Expendable supplies expense	8,029	6,682	6,166
Water, light and heating expense	11,749	11,867	12,629
Repairs and maintenance expense	79,185	88,576	62,580
Ordinary development expense	197,436	224,463	215,494
Travel expense	10,793	15,652	14,363
Clothing expense	14,834	9,369	10,108
Survey and analysis expense	826	848	705
Membership fee	1,274	969	1,043
Power purchase	0	0	0
Disclosure - Other selling and administrative expenses
Accommodation development expenses	30,889	53,945	52,822
Miscellaneous wages	45,887	39,794	32,447
Litigation and filing expenses	19,341	21,768	12,853
Compensation for damages	8,374	(1,924)	19,193
Outsourcing expenses	3,610	3,293	3,036
Reward expenses	3,228	2,858	2,713
Overseas market development expenses	1,218	1,997	1,361
Others	22,920	28,775	23,772
Others	135,467	150,506	148,197
General and administrative expenses	2,678,443	2,669,576	2,627,890
Total expenses, by nature	2,678,443	2,669,576	2,627,890
Cost of sales
Expenses by nature [Line Items]
Raw materials used	13,544,827	17,084,029	19,537,928
Salaries	4,183,454	3,834,772	3,478,804
Retirement benefits expense	458,029	652,467	375,505
Welfare and benefit expense	484,319	443,482	464,483
Insurance expense	93,130	93,702	93,876
Depreciation	11,151,393	10,734,246	9,683,887
Amortization of intangible assets	83,380	80,368	64,785
Bad debt expense	0	0	0
Commission	376,047	378,861	475,188
Advertising expense	8,161	9,852	9,419
Training expense	12,912	16,903	14,096
Vehicle maintenance expense	7,161	7,652	7,809
Publishing expense	3,524	3,423	3,530
Business promotion expense	3,720	3,981	3,860
Rental expense	191,073	176,413	171,132
Telecommunication expense	9,961	11,034	82,568
Transportation expense	10,362	4,555	4,537
Taxes and dues	492,203	481,684	440,317
Expendable supplies expense	36,966	32,999	31,844
Water, light and heating expense	31,209	32,378	34,640
Repairs and maintenance expense	2,465,716	2,210,278	2,156,668
Ordinary development expense	503,206	511,252	508,394
Travel expense	60,896	68,581	67,064
Clothing expense	8,116	7,539	4,368
Survey and analysis expense	3,746	3,949	3,929
Membership fee	13,130	12,730	11,563
Power purchase	15,725,220	18,269,732	18,307,289
Disclosure - Other selling and administrative expenses
Others	1,842,735	2,612,973	2,170,238
Cost of sales	51,804,596	57,779,835	58,207,721
Total expenses, by nature	₩ 51,804,596	₩ 57,779,835	₩ 58,207,721

Basic earnings (loss) per share

Basic earnings (loss) per share (Details) - KRW (₩) ₩ / shares in Units, ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Basic earnings (loss) per share [Abstract]
Profit (loss) attributable to owners of the controlling company	₩ 1,991,347	₩ (2,345,517)	₩ (1,314,567)
Profit (loss) used in the calculation of total basic earnings (loss) per share	₩ 1,991,347	₩ (2,345,517)	₩ (1,314,567)
Weighted average number of common shares	641,964,077	641,964,077	641,964,077
Basic earnings (loss) per share	₩ 3,102	₩ (3,654)	₩ (2,048)

Diluted earnings (loss) per sha

Diluted earnings (loss) per share (Details) - KRW (₩) ₩ / shares in Units, ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Diluted earnings (loss) per share [Abstract]
Profit (loss) used in the calculation of total diluted earnings (loss) per share	₩ 1,991,347	₩ (2,345,517)	₩ (1,314,567)
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	₩ 3,102	₩ (3,654)	₩ (2,048)

Capital risk management (Detail

Capital risk management (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of Capital risk management [Abstract]
Total borrowings and debt securities	₩ 69,724,581	₩ 67,876,541
Cash and cash equivalents	2,029,584	1,810,129	₩ 1,358,345	₩ 2,369,739
Net borrowings and debt securities	67,694,997	66,066,412
Total shareholders' equity	₩ 70,666,846	₩ 68,889,649	₩ 71,092,762	₩ 72,964,641
Debt to equity ratio	95.79%	95.90%

Maximum exposure to credit risk

Maximum exposure to credit risk (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2020	Dec. 31, 2019
Cash and Cash Equivalents
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		₩ 2,029,584	₩ 1,810,129
Financial assets at fair value through profit or loss
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk	[1]	1,808,404	747,261
Not Designated as Hedging Instrument
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		110,764	165,204
Financial assets at amortized cost
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		14,422	13,609
Loans and receivables
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		790,162	738,707
Long-term/short-term financial instruments
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		2,062,103	1,960,227
Designated as Hedging Instrument
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		55,649	145,829
Trade and other receivables
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		9,780,039	9,703,749
Financial guarantee contracts
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk	[2]	₩ 3,224,696	₩ 3,338,566
[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 for actuar

Sensitivity analysis for actuarial assumptions (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Actuarial assumption of expected rates of salary increases
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
1% Increase	₩ 488,087	₩ 442,748
1% Decrease	(425,708)	(386,147)
Actuarial assumption of discount rates
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
1% Increase	(443,527)	(402,099)
1% Decrease	₩ 524,856	₩ 475,765

Principal assumptions on provis

Principal assumptions on provisions valuation (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
PCBs
Disclosure of Principal assumptions on provisions valuation [Line Items]
Inflation rate	1.06%	1.09%
Discount rate	1.83%	1.97%
Nuclear plants
Disclosure of Principal assumptions on provisions valuation [Line Items]
Inflation rate	1.07%	1.10%
Discount rate	2.20%	2.43%
Spent fuel
Disclosure of Principal assumptions on provisions valuation [Line Items]
Inflation rate	2.93%	2.93%
Discount rate	4.49%	4.49%

Sensitivity analysis for provis

Sensitivity analysis for provisions assumptions (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
PCBs | Discount rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	₩ (292)	₩ (527)
0.1% Decrease	293	530
PCBs | Inflation rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	295	534
0.1% Decrease	(294)	(532)
Nuclear plants | Discount rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	(326,926)	(316,184)
0.1% Decrease	336,928	325,828
Nuclear plants | Inflation rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	357,676	346,082
0.1% Decrease	(347,450)	(336,182)
Spent fuel | Discount rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	(51,558)	(51,607)
0.1% Decrease	53,571	53,621
Spent fuel | Inflation rate
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]
0.1% Increase	54,345	54,396
0.1% Decrease	₩ (52,375)	₩ (52,424)

Foreign currency risk (Details)

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, £ in Thousands, kr in Thousands, SFr in Thousands, Rp 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, 2020USD ($)

Dec. 31, 2020HKD ($)

Dec. 31, 2020CHF (SFr)

Dec. 31, 2020AUD ($)

Dec. 31, 2020EUR (€)

Dec. 31, 2020SEK (kr)

Dec. 31, 2020PHP (₱)

Dec. 31, 2020JOD (JD)

Dec. 31, 2020JPY (¥)

Dec. 31, 2020PKR (₨)

Dec. 31, 2020AED (د.إ)

Dec. 31, 2020BDT (৳)

Dec. 31, 2020BWP (P)

Dec. 31, 2020EGP (ج.م.)

Dec. 31, 2020CAD ($)

Dec. 31, 2020CNY (¥)

Dec. 31, 2020CZK (Kč)

Dec. 31, 2020GBP (£)

Dec. 31, 2020IDR (Rp)

Dec. 31, 2020INR (₨)

Dec. 31, 2020KZT (₸)

Dec. 31, 2020MGA (Ar)

Dec. 31, 2020MMK (K)

Dec. 31, 2020SAR (ر.س)

Dec. 31, 2020UYU ($)

Dec. 31, 2020VND (₫)

Dec. 31, 2020ZAR (R)

Dec. 31, 2019USD ($)

Dec. 31, 2019HKD ($)

Dec. 31, 2019CHF (SFr)

Dec. 31, 2019AUD ($)

Dec. 31, 2019EUR (€)

Dec. 31, 2019SEK (kr)

Dec. 31, 2019PHP (₱)

Dec. 31, 2019JOD (JD)

Dec. 31, 2019JPY (¥)

Dec. 31, 2019PKR (₨)

Dec. 31, 2019AED (د.إ)

Dec. 31, 2019BDT (৳)

Dec. 31, 2019BWP (P)

Dec. 31, 2019EGP (ج.م.)

Dec. 31, 2019CAD ($)

Dec. 31, 2019CNY (¥)

Dec. 31, 2019CZK (Kč)

Dec. 31, 2019GBP (£)

Dec. 31, 2019IDR (Rp)

Dec. 31, 2019INR (₨)

Dec. 31, 2019KZT (₸)

Dec. 31, 2019MGA (Ar)

Dec. 31, 2019MMK (K)

Dec. 31, 2019SAR (ر.س)

Dec. 31, 2019UYU ($)

Dec. 31, 2019VND (₫)

Dec. 31, 2019ZAR (R)

Disclosure of Foreign currency risk [Abstract]

Assets

$ 1,445,522

$ 0

SFr 0

$ 133

€ 310

kr 0

₱ 191,122

JD 1,673

¥ 825,269

₨ 371,328

د.إ 39,678

৳ 93,442

P 890

ج.م. 0

$ 247

¥ 0

Kč 0

£ 0

Rp 342,496

₨ 1,231,895

₸ 1,510

Ar 5,645,349

K 11,032

ر.س 2,178

$ 78,265

₫ 672,563

R 303

$ 1,227,054

$ 0

SFr 0

$ 143

€ 208

kr 0

₱ 175,210

JD 1,516

¥ 109,970

₨ 354,361

د.إ 57,403

৳ 85,547

P 1,437

ج.م. 0

$ 86

¥ 0

Kč 0

£ 0

Rp 376,136

₨ 1,244,170

₸ 319

Ar 3,858,201

K 29,651

ر.س 2,653

$ 58,781

₫ 418,998

R 450

Liabilities

$ 12,234,563

$ 1,651,839

SFr 500,406

$ 707,538

€ 121,069

kr 449,824

₱ 104,161

JD 0

¥ 484,585

₨ 12,222

د.إ 31,594

৳ 0

P 0

ج.م. 948

$ 1,840

¥ 0

Kč 2,033

£ 43

Rp 555,241

₨ 155,134

₸ 0

Ar 0

K 0

ر.س 0

$ 1,585

₫ 0

R 0

$ 9,963,928

$ 1,648,815

SFr 500,753

$ 1,036,785

€ 111,199

kr 449,072

₱ 130,073

JD 147

¥ 314,402

₨ 4,366

د.إ 40,061

৳ 635

P 0

ج.م. 0

$ 3,112

¥ 26,140

Kč 243

£ 191

Rp 219,801

₨ 210,232

₸ 0

Ar 133,403

K 0

ر.س 480

$ 8,213

₫ 1,375

R 6

Sensitivity analysis for Foreig

Sensitivity analysis for Foreign currency exchange rates (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Increase (decrease) of income before income tax
Disclosure of Sensitivity analysis for Foreign currency exchange rates [Line Items]
10% Increase		₩ (1,336,821)	₩ (1,197,530)
10% Decrease		1,336,821	1,197,530
Increase (decrease) of shareholder's equity
Disclosure of Sensitivity analysis for Foreign currency exchange rates [Line Items]
10% Increase	[1]	(1,336,821)	(1,197,530)
10% Decrease	[1]	₩ 1,336,821	₩ 1,197,530
[1]	The effect on the shareholders' equity excluding the impact of income taxes.

Interest rate risk (Details)

Interest rate risk (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of financial instruments by type of interest rate [Line Items]
Short-term borrowings	₩ 2,113,181	₩ 1,315,134
Long-term borrowings	3,003,999	3,389,743
Total	69,724,581	67,876,541
Floating interest rate [Member]
Disclosure of financial instruments by type of interest rate [Line Items]
Short-term borrowings	171,518	0
Long-term borrowings	2,191,322	2,273,579
Debt securities	250,968	243,102
Total	₩ 2,613,808	₩ 2,516,681

Sensitivity analysis for Intere

Sensitivity analysis for Interest rates (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Increase (decrease) of income before income tax
Disclosure of Sensitivity analysis for Interest rates [Line Items]
1% Increase		₩ (26,138)	₩ (25,167)
1% Decrease		26,138	25,167
Increase (decrease) of shareholder's equity
Disclosure of Sensitivity analysis for Interest rates [Line Items]
1% Increase	[1]	(26,138)	(25,167)
1% Decrease	[1]	₩ 26,138	₩ 25,167
[1]	The effect on the shareholders' equity excluding the impact of income taxes.

Sensitivity analysis for electr

Sensitivity analysis for electricity rates (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Increase (decrease) of income before income tax
Disclosure of Sensitivity analysis for electricity rates [Line Items]
1% Increase		₩ 557,310	₩ 559,390
1% Decrease		(557,310)	(559,390)
Increase (decrease) of shareholder's equity
Disclosure of Sensitivity analysis for electricity rates [Line Items]
1% Increase	[1]	557,310	559,390
1% Decrease	[1]	₩ (557,310)	₩ (559,390)
[1]	The effect on the equity excluding the impact of income taxes.

Maturity analysis for non-deriv

Maturity analysis for non-derivative financial liabilities (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2020	Dec. 31, 2019
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Borrowings and debt securities		₩ 82,326,295	₩ 80,399,789
Finance lease liabilities		5,209,537	5,757,009
Trade and other payables		8,115,837	8,545,029
Financial guarantee contracts	[1]	3,224,696	3,338,566
Non-derivative financial liabilities, undiscounted cash flows		98,876,365	98,040,393
Less than 1 year
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Borrowings and debt securities		12,413,346	10,660,737
Finance lease liabilities		614,442	686,445
Trade and other payables		5,679,856	6,014,054
Financial guarantee contracts	[1]	926,244	937,091
Non-derivative financial liabilities, undiscounted cash flows		19,633,888	18,298,327
1~2 Years
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Borrowings and debt securities		10,919,041	10,997,510
Finance lease liabilities		569,161	617,449
Trade and other payables		373,907	382,809
Financial guarantee contracts	[1]	348,860	302,186
Non-derivative financial liabilities, undiscounted cash flows		12,210,969	12,299,954
2~5 Years
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Borrowings and debt securities		24,778,020	27,881,873
Finance lease liabilities		1,564,377	1,717,434
Trade and other payables		894,903	971,469
Financial guarantee contracts	[1]	26,230	32,314
Non-derivative financial liabilities, undiscounted cash flows		27,263,530	30,603,090
More than 5 years
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Borrowings and debt securities		34,215,888	30,859,669
Finance lease liabilities		2,461,557	2,735,681
Trade and other payables		1,167,171	1,176,697
Financial guarantee contracts	[1]	1,923,362	2,066,975
Non-derivative financial liabilities, undiscounted cash flows		₩ 39,767,978	₩ 36,839,022
[1]	This represents the total guarantee amounts associated with the financial guarantee contracts. Financial guarantee liabilities which are recognized as of December 31, 2019 and 2020 are KRW81,357 million and KRW66,354 million, respectively.

Maturity analysis for non-der_2

Maturity analysis for non-derivative financial assets (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of maturity analysis for financial assets held for managing liquidity risk [Line Items]
Cash and cash equivalents		₩ 2,029,584	₩ 1,810,129	₩ 1,358,345	₩ 2,369,739
Financial assets at fair value through other comprehensive income		358,559	379,170
Financial assets at amortised cost		14,422	13,609
Loans and receivables		821,094	774,772
Long-term/short-term financial instruments		2,062,103	1,960,227
Financial assets at fair value through profit or loss		1,881,382	747,261
Trade and other receivables		9,784,899	9,711,107
Financial assets held for managing liquidity risk		16,952,043	15,396,275
Less than 1 year
Disclosure of maturity analysis for financial assets held for managing liquidity risk [Line Items]
Cash and cash equivalents		2,029,584	1,810,129
Financial assets at fair value through other comprehensive income		0	0
Financial assets at amortised cost		13,149	12,302
Loans and receivables		78,805	64,081
Long-term/short-term financial instruments		1,483,482	1,351,971
Financial assets at fair value through profit or loss		1,196,101	131,385
Trade and other receivables		7,920,005	7,703,746
Financial assets held for managing liquidity risk		12,721,126	11,073,614
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		1,265	1,307
Loans and receivables		385,571	346,583
Long-term/short-term financial instruments		252,349	269,863
Financial assets at fair value through profit or loss		0	79
Trade and other receivables		1,160,400	980,951
Financial assets held for managing liquidity risk		1,799,585	1,598,783
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		8	0
Loans and receivables		325,212	336,502
Long-term/short-term financial instruments		386	0
Financial assets at fair value through profit or loss		2,690	0
Trade and other receivables		704,494	818,431
Financial assets held for managing liquidity risk		1,032,790	1,154,933
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]	358,559	379,170
Financial assets at amortised cost	[1]	0	0
Loans and receivables	[1]	31,506	27,606
Long-term/short-term financial instruments	[1]	325,886	338,393
Financial assets at fair value through profit or loss	[1]	682,591	615,797
Trade and other receivables	[1]	0	207,979
Financial assets held for managing liquidity risk	[1]	₩ 1,398,542	₩ 1,568,945
[1]	The maturities cannot be presently determined.

Maturity analysis for derivativ

Maturity analysis for derivative financial assets and liabilities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	₩ (366,732)	₩ (178,556)
Derivative assets	172,910	321,116
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	(3,017)
Derivative 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	(158,688)	(58,725)
Derivative assets	117,261	172,653
Gross settlement | Designated as Hedging Instrument
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	(208,044)	(116,814)
Derivative assets	55,649	145,829
Gross settlement | Not Designated as Hedging Instrument Others
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative assets	0	2,634
Less than 1 year
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	(50,635)	(77,874)
Derivative assets	29,523	27,618
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	(3,017)
Derivative 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	(12,777)	(15,011)
Derivative assets	18,332	21
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	(37,858)	(59,846)
Derivative assets	11,191	27,597
1~2 Years
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	(62,355)	(29,761)
Derivative assets	1,529	91,153
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	(22,827)	(8,295)
Derivative assets	1,529	43,931
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	(39,528)	(21,466)
Derivative assets	0	47,222
2~5 Years
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	(194,154)	(41,568)
Derivative assets	86,443	143,396
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	(118,704)	(39,654)
Derivative assets	45,237	72,386
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	(75,450)	(1,914)
Derivative assets	41,206	71,010
More than 5 years
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative financial liabilities, undiscounted cash flows	(59,588)	(29,353)
Derivative assets	55,415	58,949
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	(4,380)	4,235
Derivative assets	52,163	56,315
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	(55,208)	(33,588)
Derivative assets	3,252	0
More than 5 years | Gross settlement | Not Designated as Hedging Instrument Others
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Derivative assets	₩ 0	₩ 2,634

Fair value measurement of instr

Fair value measurement of instruments (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2020	Dec. 31, 2019
Financial assets, category | At fair value
Disclosure of fair value measurement of instruments [Line Items]
Book value		₩ 2,406,354	₩ 1,437,464
Fair value		2,406,354	1,437,464
Financial assets, category | At amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		14,676,310	14,226,421
Fair value		14,676,310	14,226,421
Financial assets at fair value through other comprehensive income | At fair value
Disclosure of fair value measurement of instruments [Line Items]
Book value		358,559	379,170
Fair value		358,559	379,170
Derivative Financial Instruments, Assets | Not Designated as Hedging Instrument | At fair value
Disclosure of fair value measurement of instruments [Line Items]
Book value		110,764	165,204
Fair value		110,764	165,204
Derivative Financial Instruments, Assets | Designated as Hedging Instrument | At fair value
Disclosure of fair value measurement of instruments [Line Items]
Book value		55,649	145,829
Fair value		55,649	145,829
Financial assets at fair value through profit or loss | At fair value
Disclosure of fair value measurement of instruments [Line Items]
Book value		1,881,382	747,261
Fair value		1,881,382	747,261
Financial assets at amortized cost | At amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		14,422	13,609
Fair value		14,422	13,609
Loans and receivables | At amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		790,162	738,707
Fair value		790,162	738,707
Long-term financial instruments | At amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		578,621	608,256
Fair value		578,621	608,256
Short-term financial instruments | At amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		1,483,482	1,351,971
Fair value		1,483,482	1,351,971
Trade receivables | At amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		9,780,039	9,703,749
Fair value		9,780,039	9,703,749
Cash and Cash Equivalents | At amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		2,029,584	1,810,129
Fair value		2,029,584	1,810,129
Liabilities | At fair value
Disclosure of fair value measurement of instruments [Line Items]
Book value		365,119	169,960
Fair value		365,119	169,960
Liabilities | At amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		82,461,514	81,491,703
Fair value		87,398,465	85,246,892
Derivative Financial Instruments, Liabilities | Not Designated as Hedging Instrument | At fair value
Disclosure of fair value measurement of instruments [Line Items]
Book value		157,926	53,147
Fair value		157,926	53,147
Derivative Financial Instruments, Liabilities | Designated as Hedging Instrument | At fair value
Disclosure of fair value measurement of instruments [Line Items]
Book value		207,193	116,813
Fair value		207,193	116,813
Secured borrowings | At amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		63,614	227,135
Fair value		63,614	227,135
Unsecured bond | At amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		64,607,401	63,171,664
Fair value		68,839,316	66,917,421
Lease liabilities | At amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		4,621,096	5,070,133
Fair value		4,621,096	5,070,133
Unsecured borrowings | At amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		4,808,206	4,104,523
Fair value		5,513,242	4,113,955
Trade and other payables | At amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value	[1]	8,115,837	8,545,029
Fair value	[1]	8,115,837	8,545,029
Bank overdraft | At amortized cost
Disclosure of fair value measurement of instruments [Line Items]
Book value		245,360	373,219
Fair value		₩ 245,360	₩ 373,219
[1]	Excludes lease liabilities.

Significant unobservable inputs

Significant unobservable inputs used in fair value measurement of liabilities (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Derivatives
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [Line Items]
Interest rate, significant unobservable inputs, liabilities	(-) 0.73% ~ 3.08%	0.01% ~ 4.16%
Borrowings and debt securities
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [Line Items]
Interest rate, significant unobservable inputs, liabilities	(-) 0.53% ~ 4.38%	0.17% ~ 3.90%
Finance lease
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [Line Items]
Interest rate, significant unobservable inputs, liabilities	0.57% ~ 16.60%	1.38% ~ 10.83%

Fair value measurement of asset

Fair value measurement of assets (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of fair value measurement of assets [Line Items]
Financial assets at fair value through other comprehensive income	₩ 358,559	₩ 379,170	₩ 399,494
Derivative assets	172,910	321,116
Financial assets at fair value through profit or loss	1,881,382	747,261
At fair value
Disclosure of fair value measurement of assets [Line Items]
Financial assets at fair value through other comprehensive income	358,559	379,170
Derivative assets	166,413	311,033
Financial assets at fair value through profit or loss	1,881,382	747,261
Total	2,406,354	1,437,464
At fair value | Level 1
Disclosure of fair value measurement of assets [Line Items]
Financial assets at fair value through other comprehensive income	194,670	201,202
Derivative assets	0	0
Financial assets at fair value through profit or loss	0	0
Total	194,670	201,202
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	166,413	308,399
Financial assets at fair value through profit or loss	1,875,690	742,105
Total	2,042,103	1,050,504
At fair value | Level 3
Disclosure of fair value measurement of assets [Line Items]
Financial assets at fair value through other comprehensive income	163,889	177,968
Derivative assets	0	2,634
Financial assets at fair value through profit or loss	5,692	5,156
Total	₩ 169,581	₩ 185,758

Fair value measurement of liabi

Fair value measurement of liabilities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of fair value measurement of liabilities [Line Items]
Derivative liabilities	₩ 365,119	₩ 169,960
At fair value | Level 2
Disclosure of fair value measurement of liabilities [Line Items]
Derivative liabilities	365,119	169,960
At fair value | Level 3
Disclosure of fair value measurement of liabilities [Line Items]
Derivative liabilities	₩ 0	₩ 0

Reconciliation of changes in fa

Reconciliation of changes in fair value measurement, assets (Details) - At fair value - Level 3 - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Financial assets at fair value through profit or loss, category [Member]
Reconciliation of changes in fair value measurement, assets [Line Items]
Beginning balance	₩ 5,156	₩ 5,052
Changes in fair value measurement, assets
Acquisition	359	40
Reclassified category	0	0
Valuation	623	64
Disposal	(446)	0
Foreign currency translation	0	0
Ending balance	5,692	5,156
Financial assets at fair value through other comprehensive income [Member]
Reconciliation of changes in fair value measurement, assets [Line Items]
Beginning balance	177,968	189,439
Changes in fair value measurement, assets
Acquisition	2,900	1,876
Reclassified category	0	0
Valuation	(23,128)	3,715
Disposal	(1)	(19,315)
Foreign currency translation	6,150	2,253
Ending balance	₩ 163,889	₩ 177,968

Service Concession Arrangemen_3

Service Concession Arrangements (Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2020KRW (₩)
Disclosure of detailed information about service concession arrangements [Line Items]
Gas Complex - Thermal Power Plant at Ilijan, Philippines (BOT)	₩ 160,999
Hydroelectric Power Generation at Semangka, Indonesia (BOT)	606,782
Less than 1 year
Disclosure of detailed information about service concession arrangements [Line Items]
Gas Complex - Thermal Power Plant at Ilijan, Philippines (BOT)	113,646
Hydroelectric Power Generation at Semangka, Indonesia (BOT)	27,113
1~2 Years
Disclosure of detailed information about service concession arrangements [Line Items]
Gas Complex - Thermal Power Plant at Ilijan, Philippines (BOT)	47,353
Hydroelectric Power Generation at Semangka, Indonesia (BOT)	27,144
2~3 Years
Disclosure of detailed information about service concession arrangements [Line Items]
Hydroelectric Power Generation at Semangka, Indonesia (BOT)	27,175
Over 3 years
Disclosure of detailed information about service concession arrangements [Line Items]
Hydroelectric Power Generation at Semangka, Indonesia (BOT)	₩ 525,350

Transactions between related pa

Transactions between related parties (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Associates
Disclosure of transactions between related parties [Line Items]
Electricity sales	₩ 220,801	₩ 200,574	₩ 144,751
Service sales	53,838	33,727	31,936
Design service	19,321	14,295	15,197
Dividend paid	0	0	0
Commission	0	0	0
Technical fee	0	0	0
Construction revenue	0	0	0
Interest income	0	0	0
Interest expense	0	0	0
Electricity purchase	2,584,539	2,752,321	2,873,781
Purchase of power generation fuel	3,270,972	4,049,486	5,191,243
REC purchase	14,317	26,843	22,482
Service purchase	1,151	2,060	1,006
Rental fee and others	0	0	0
Electricity metering service fee	212,366	245,057	261,668
Trading fees	87,361	120,509	137,489
Woodchip purchase	0	0	440
Electricity sales and others	66,755	98,450	60,318
Electricity purchase and Others	0	0	31
Outstanding balances for related party transactions [Abstract]
Trade receivables	19,718	13,446	13,005
Trade payables	689,395	806,024	862,594
Non-trade receivables and others	33,410	14,659	8,482
Non-trade payables and others	140,964	77,246	78,129
Accrued interest income	0	0	0
Derivative assets	0	0	0
Derivative liabilities	0	0	0
Dongducheon Dream Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	7,757	7,071	6,093
Electricity purchase	552,692	689,510	828,547
Outstanding balances for related party transactions [Abstract]
Trade receivables	388	323
Trade payables	65,794	85,920
Non-trade receivables and others	213	267
Non-trade payables and others	0	12
Korea Gas Corporation
Disclosure of transactions between related parties [Line Items]
Electricity sales	97,685	116,484	99,933
Purchase of power generation fuel	3,270,972	4,049,486	5,191,243
Outstanding balances for related party transactions [Abstract]
Trade receivables	9,969	9,267
Trade payables	428,763	462,138
Non-trade receivables and others	95	38
Non-trade payables and others	617	560
Daejung Offshore Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	32	1	1
Outstanding balances for related party transactions [Abstract]
Non-trade receivables and others	31	0
Daegu Photovoltaic Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	325	327	128
REC purchase	3,313	3,626	3,745
Outstanding balances for related party transactions [Abstract]
Trade payables	57	69
Haeng Bok Do Si Photovoltaic Power Co., Ltd. [Member]
Disclosure of transactions between related parties [Line Items]
Electricity sales	2	2	2
REC purchase	370	450	455
Korea Electric Power Industrial Development Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	10,833	11,085	10,422
Electricity metering service fee	212,366	245,057	261,668
Outstanding balances for related party transactions [Abstract]
Trade receivables	508	243
Trade payables	133	3,756
Non-trade receivables and others	16	43
Non-trade payables and others	3,779	3,827
Goseong Green Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	47,701	19,245	10,024
Electricity purchase	0	32	0
Outstanding balances for related party transactions [Abstract]
Trade receivables	2,181	103
Non-trade receivables and others	9,214	5,285
Non-trade payables and others	64,986	65,626
Gangneung Eco Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	10,178	7,446	4,928
Service purchase	0	0	19
Outstanding balances for related party transactions [Abstract]
Trade receivables	661	115
Non-trade receivables and others	146	65
Shin Pyeongtaek Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	20,791	21,218	8,468
Electricity purchase	520,737	119,162	0
Outstanding balances for related party transactions [Abstract]
Trade receivables	1,348	1,013
Trade payables	47,948	64,696
Non-trade receivables and others	2,823	2,281
Non-trade payables and others	85	61
Noeul Green Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	30	30	30
REC purchase	10,634	22,767	18,282
Outstanding balances for related party transactions [Abstract]
Trade receivables	3	3
Non-trade receivables and others	969	0
Non-trade payables and others	0	1,855
Samcheok Eco Materials Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	700	627	605
Electricity purchase	10,713	9,425	3,819
Outstanding balances for related party transactions [Abstract]
Trade receivables	47	59
YTN Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	1,805	2,257	2,043
Electricity purchase	353
Service purchase	353	333	322
Outstanding balances for related party transactions [Abstract]
Trade receivables	97	97
Busan Green Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	34	18	19
Electricity purchase	18,678	13,811	25,123
Outstanding balances for related party transactions [Abstract]
Trade receivables	5	1
Non-trade receivables and others	13,946	0
Non-trade payables and others	0	606
Gunsan Bio Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	102	4,755	3,611
Electricity purchase	24	3,022	0
Korea Electric Vehicle Charging Service
Disclosure of transactions between related parties [Line Items]
Electricity sales	1,956	1,029	578
Service purchase	581	536	605
Outstanding balances for related party transactions [Abstract]
Trade receivables	141	137
Non-trade receivables and others	281	529
Tamra Offshore Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	0	0	58
Electricity purchase	0	0	8,371
Daegu clean Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	0	0	126
Yaksu ESS Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service purchase	217	1,191	0
Outstanding balances for related party transactions [Abstract]
Trade payables	739	525
Gangwon Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	2,109	2,433	2,402
Electricity purchase	23,350	24,116	25,407
Outstanding balances for related party transactions [Abstract]
Trade receivables	6	7
Trade payables	2,678	2,979
Gwangyang Green Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	23	122	874
Outstanding balances for related party transactions [Abstract]
Non-trade receivables and others	1,356	1,334
Bigeum Resident Photovoltaic Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	85
Hyundai Green Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Design service	17,257	13,106	14,031
Electricity purchase	349,778	507,662	480,815
Outstanding balances for related party transactions [Abstract]
Trade receivables	554	502
Trade payables	9,825	41,587
Korea Power Exchange
Disclosure of transactions between related parties [Line Items]
Service sales	25,919	7,670	6,854
Trading fees	87,361	120,509	137,489
Outstanding balances for related party transactions [Abstract]
Trade receivables	1,608	1,142
Trade payables	1,362
Non-trade receivables and others	24	144
Non-trade payables and others	70,456	4,160
Ecollite Co., Ltd.
Outstanding balances for related party transactions [Abstract]
Non-trade receivables and others	0	210
Taebaek Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	226	991	614
Electricity purchase	4,003	7,070	8,582
Outstanding balances for related party transactions [Abstract]
Trade payables	443	358
Non-trade receivables and others	1,405
Non-trade payables and others	0	243
Taeback Guinemi Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	37	77	0
Electricity purchase	5,023	349	0
Outstanding balances for related party transactions [Abstract]
Trade payables	413	190
Non-trade receivables and others	0	2
Non-trade payables and others	509	0
Pyeongchang Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Design service	2,064	1,189	1,166
Electricity purchase	3,969	5,188	6,994
Outstanding balances for related party transactions [Abstract]
Trade receivables	3	4
Daeryun Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	1,947	1,879	1,731
Electricity purchase	99,523	144,862	184,063
Outstanding balances for related party transactions [Abstract]
Trade receivables	189	144
Trade payables	16,079	19,843
Changjuk Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	2,067	927	758
Electricity purchase	6,084	6,994	7,929
Outstanding balances for related party transactions [Abstract]
Trade payables	461	447
Non-trade payables and others	309	280
GS Donghae Electric Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	31,557	15,792	7,238
Electricity purchase	660,351	681,379	780,233
Outstanding balances for related party transactions [Abstract]
Trade receivables	386	175
Trade payables	91,213	69,811
Non-trade receivables and others	321	367
Non-trade payables and others	36	16
KNH Solar Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	16	17	17
Electricity purchase	3,564	3,377	3,586
Outstanding balances for related party transactions [Abstract]
Trade receivables	1	1
Trade payables	14
Non-trade payables and others	187	0
S-Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	6,682	6,535	9,118
Electricity purchase	293,515	522,469	507,875
Outstanding balances for related party transactions [Abstract]
Trade receivables	137	89
Trade payables	23,415	53,705
Non-trade receivables and others	46	43
Hadong Mineral Fiber Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service purchase	0	0	60
Green Biomass Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Woodchip purchase	0	0	440
PND solar Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	409	407	12
Electricity purchase	5,234	557	0
Outstanding balances for related party transactions [Abstract]
Trade payables	58	0
Hyundai Ecoenergy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	167	117	0
Electricity purchase	17,777	6,810	0
Outstanding balances for related party transactions [Abstract]
Trade receivables	16	16
YeongGwang Yaksu Wind Electric Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	77	81	0
Electricity purchase	9,151	6,511	2,437
Outstanding balances for related party transactions [Abstract]
Trade receivables	8	5
Korea Energy Solution Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	7	52	0
Electricity purchase	0	15	0
Gwangbaek Solar Power Investment Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity purchase	373
Green Energy Electricity Generation Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	14
Namjeongsusang Solar Power Operation Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	14
Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1
Disclosure of transactions between related parties [Line Items]
Electricity sales	291
Muan Solar Park Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	57
Outstanding balances for related party transactions [Abstract]
Trade receivables	24
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	2,974	5,606	0
Outstanding balances for related party transactions [Abstract]
Trade receivables	2
Non-trade receivables and others	712	2,939
Muan Sunshine Solar Power Plant Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	30
6 Associates (Overseas)
Outstanding balances for related party transactions [Abstract]
Non-trade receivables and others	3,248	1,112
9 Associates (Overseas)
Disclosure of transactions between related parties [Line Items]
Electricity sales	0
Electricity sales and others	66,755	98,450	60,318
Electricity purchase and Others	0	0	31
Joint ventures
Disclosure of transactions between related parties [Line Items]
Electricity sales	9,853	8,608	6,740
Service sales	26,623	18,168	16,999
Design service	0	0	0
Dividend paid	0	0	0
Commission	476	504	648
Technical fee	33	4	3,424
Construction revenue	14	354	568
Interest income	0	0	0
Interest expense	0	0	0
Electricity purchase	691,707	726,884	662,290
Purchase of power generation fuel	0	0	0
REC purchase	9,768	10,910	11,414
Service purchase	221,604	144,787	80,088
Rental fee and others	0	0	0
Electricity metering service fee	0	0	0
Trading fees	0	0	0
Woodchip purchase	0	0	0
Electricity sales and others	831,596	1,275,279	206,054
Electricity purchase and Others	14,767	7,232	1,404
Outstanding balances for related party transactions [Abstract]
Trade receivables	60,767	53,615	728
Trade payables	90,509	53,759	68,007
Non-trade receivables and others	44,237	34,180	10,589
Non-trade payables and others	151,544	158,438	18,487
Accrued interest income	0	0	0
Derivative assets	0	0	0
Derivative liabilities	0	0	0
Naepo Green Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	217	154	160
Outstanding balances for related party transactions [Abstract]
Trade receivables	56	18
Cheongna Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	13,791	9,922	11,688
Electricity purchase	66	58,747	58
Outstanding balances for related party transactions [Abstract]
Trade receivables	1,592	1,074
Non-trade receivables and others	1,186	0
DAYONE Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.)
Disclosure of transactions between related parties [Line Items]
Service sales	4,816	3,437	1,718
Electricity purchase	1,120	2,847	3,445
Outstanding balances for related party transactions [Abstract]
Trade receivables	57	128
Trade payables	10	175
Non-trade receivables and others	11,749	12,532
Non-trade payables and others	9,119	9,178
Daegu Green Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	1,285	1,151	1,022
Electricity purchase	215,224	296,464	287,008
Outstanding balances for related party transactions [Abstract]
Trade receivables	44	113
Trade payables	26,213	28,980
Non-trade receivables and others	55	1
KAPES, Inc.
Disclosure of transactions between related parties [Line Items]
Commission	476	504	648
Service purchase	219,673	142,511	77,758
Outstanding balances for related party transactions [Abstract]
Trade receivables	2	1
Non-trade receivables and others	5,172	0
Non-trade payables and others	20,577	50,738
Honam Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	502	657	415
Electricity purchase	4,382	5,306	7,700
Outstanding balances for related party transactions [Abstract]
Trade payables	216	347
Non-trade payables and others	345	1,671
Jeongam Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	1,213	1,198	724
Electricity purchase	5,982	0	0
Outstanding balances for related party transactions [Abstract]
Trade receivables	0	165
Non-trade receivables and others	162
Non-trade payables and others	692	6
Korea Power Engineering Service Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	203	348	840
Service purchase	1,594	1,774	1,765
Outstanding balances for related party transactions [Abstract]
Non-trade receivables and others	43	74
Seokmun Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	1,932	1,495	1,897
Electricity purchase	33,164	26,370	31,759
Outstanding balances for related party transactions [Abstract]
Trade receivables	62	51
Trade payables	4,898
Non-trade receivables and others	9,460	136
Non-trade payables and others	9,559	4,750
Incheon New Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Construction revenue	14	354	568
Chun-cheon Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	2,657	2,397	2,471
Electricity purchase	222,069	313,471	320,954
Outstanding balances for related party transactions [Abstract]
Trade receivables	98	260
Trade payables	27,428	23,438
Non-trade receivables and others	165	5,362
Yeonggwangbaeksu Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	1,788	1,744	1,540
Electricity purchase	11,232	11,739	11,366
Outstanding balances for related party transactions [Abstract]
Trade receivables	8	6
Trade payables	405	671
Non-trade receivables and others	159	157
Non-trade payables and others	1,747	1,526
Yeonggwang Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	793	705	46
Electricity purchase	24,103	11,940	0
Outstanding balances for related party transactions [Abstract]
Trade receivables	12	10
Trade payables	886
Non-trade receivables and others	54	54
Non-trade payables and others	3,038	2,432
Sam-Yang Photovoltaic Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	33
Electricity purchase	3,848
Outstanding balances for related party transactions [Abstract]
Trade receivables	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	1,388
KW Nuclear Components Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	1,639	721	839
Outstanding balances for related party transactions [Abstract]
Trade receivables	4	4
Non-trade receivables and others	0	15
KEPCO-Uhde Inc.
Disclosure of transactions between related parties [Line Items]
Electricity sales	8	15	17
Outstanding balances for related party transactions [Abstract]
Non-trade payables and others	0	9
Busan Shinho Solar Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	353	452	362
REC purchase	7,296	7,843	7,901
Outstanding balances for related party transactions [Abstract]
Trade receivables	2	2
Trade payables	135	148
Non-trade payables and others	780	733
Global Trade Of Power System Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service purchase	337	502	565
Expressway Solar-light Power Generation Co., Ltd.
Disclosure of transactions between related parties [Line Items]
REC purchase	2,472	3,067	3,513
Daesan Green Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	703	39	0
Electricity purchase	104,854	0	0
Outstanding balances for related party transactions [Abstract]
Trade receivables	11	6
Trade payables	7,694	0
Non-trade receivables and others	216	0
Taebaek Gadeoksan Wind Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	3
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	29	6	0
Outstanding balances for related party transactions [Abstract]
Trade receivables	2	1
Saemangeum Solar Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	2,846	2,230	0
Outstanding balances for related party transactions [Abstract]
Non-trade receivables and others	3,141	2,197
Jaeun Resident Wind Power Plant Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	0	105	0
Dangjin Eco Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	33	4	3,424
Electricity purchase	3,953	0	0
Outstanding balances for related party transactions [Abstract]
Trade receivables	3	2
Trade payables	326	0
Bitsolar Energy Co., Ltd.,
Disclosure of transactions between related parties [Line Items]
Electricity sales	42
Busan Industrial Solar Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity purchase	19
Outstanding balances for related party transactions [Abstract]
Trade payables	1
Haemodum Solar Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	4
Electricity purchase	967
Yeongam Solar Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	165
Electricity purchase	32,208
Outstanding balances for related party transactions [Abstract]
Trade receivables	26
Trade payables	14,652
Solaseado Solar Power Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Electricity sales	66
Electricity purchase	28,516
29 Joint ventures (Overseas)
Disclosure of transactions between related parties [Line Items]
Electricity sales and others	831,596	1,275,279	206,054
Electricity purchase and Others	14,767	7,232	1,404
15 Joint ventures (Overseas)
Outstanding balances for related party transactions [Abstract]
Trade receivables	58,839	51,700
Non-trade receivables and others	17,217	13,652
Non-trade payables and others	105,682	87,395
Other related parties
Disclosure of transactions between related parties [Line Items]
Electricity sales	4,248	3,948	3,524
Service sales	5,819	0	1,230
Design service	0	0	0
Dividend paid	17	20	166,876
Commission	0	0	0
Technical fee	0	0	0
Construction revenue	0	0	0
Interest income	3,461	2,091	4,438
Interest expense	3,872	4,063	5,043
Electricity purchase	0	0	0
Purchase of power generation fuel	0	0	0
REC purchase	0	0	4,019
Service purchase	0	0	63
Rental fee and others	0	0	0
Electricity metering service fee	0	0	0
Trading fees	0	0	0
Woodchip purchase	0	0	0
Electricity sales and others	0	0	0
Electricity purchase and Others	0	0	0
Outstanding balances for related party transactions [Abstract]
Trade receivables	0	0	0
Trade payables	0	0	0
Non-trade receivables and others	206,916	146,416	12,125
Non-trade payables and others	123	152	218
Accrued interest income	51	1,630	1,147
Derivative assets	20,167	41,368	27,306
Derivative liabilities	20,001	6,531	18,095
Yeongwol Energy Station Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	0	0	373
REC purchase	0	0	4,019
DS POWER Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	0	0	565
Ulleungdo Natural Energy Co., Ltd.
Disclosure of transactions between related parties [Line Items]
Service sales	0	0	292
Service purchase	0	0	63
Korea Development Bank
Disclosure of transactions between related parties [Line Items]
Electricity sales	4,248	3,948	3,524
Dividend paid	17	20	166,876
Interest income	3,461	2,091	4,438
Interest expense	3,872	4,063	₩ 5,043
Outstanding balances for related party transactions [Abstract]
Non-trade receivables and others	206,916	146,416
Non-trade payables and others	123	152
Accrued interest income	51	1,630
Derivative assets	20,167	41,368
Derivative liabilities	₩ 20,001	₩ 6,531

Loans transactions between rela

Loans transactions between related parties (Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2020KRW (₩)
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	₩ 120,023
Changes in Loans receivable transactions between related parties
Loans	102,003
Collection	(10,140)
Others	(6,681)
Ending balance	205,205
Associates
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	61,654
Changes in Loans receivable transactions between related parties
Loans	4,592
Collection	(5,083)
Others	(442)
Ending balance	60,721
KNOC Nigerian East & West Oil Co., Ltd. | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	28,676
Changes in Loans receivable transactions between related parties
Loans	92
Collection	0
Others	(1,619)
Ending balance	27,149
KNOC Nigerian East & West Oil Co., Ltd. | Accumulated impairment [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	(7,325)
Changes in Loans receivable transactions between related parties
Loans	0
Collection	0
Others	2,079
Ending balance	(5,246)
PT. Cirebon Electric Power | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	578
Changes in Loans receivable transactions between related parties
Loans	0
Collection	(609)
Others	31
Ending balance	0
Xe-Pian Xe-Namnoy Power Co., Ltd. | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	20,955
Changes in Loans receivable transactions between related parties
Loans	0
Collection	0
Others	(1,263)
Ending balance	19,692
PT Wampu Electric Power | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	16,502
Changes in Loans receivable transactions between related parties
Loans	0
Collection	(4,474)
Others	330
Ending balance	12,358
Gunsan Bio Energy Co., Ltd. | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	12,396
Changes in Loans receivable transactions between related parties
Loans	0
Collection	0
Others	0
Ending balance	12,396
Gunsan Bio Energy Co., Ltd. | Accumulated impairment [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	(10,128)
Changes in Loans receivable transactions between related parties
Loans	0
Collection	0
Others	0
Ending balance	(10,128)
Bigeum Resident Photovoltaic Power Co., Ltd. | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	0
Changes in Loans receivable transactions between related parties
Loans	3,500
Collection	0
Others	0
Ending balance	3,500
Daejung Offshore Wind Power Co., Ltd. | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	0
Changes in Loans receivable transactions between related parties
Loans	1,000
Collection	0
Others	0
Ending balance	1,000
Joint ventures
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	58,369
Changes in Loans receivable transactions between related parties
Loans	97,411
Collection	(5,057)
Others	(6,239)
Ending balance	144,484
DAYONE Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.) | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	2,465
Changes in Loans receivable transactions between related parties
Loans	0
Collection	(2,465)
Others	0
Ending balance	0
DAYONE Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.) | Accumulated impairment [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	(2,465)
Changes in Loans receivable transactions between related parties
Loans	0
Collection	2,465
Others	0
Ending balance	0
Solaseado Solar Power Co., Ltd. | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	0
Changes in Loans receivable transactions between related parties
Loans	64,000
Collection	0
Others	0
Ending balance	64,000
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	1,055
Changes in Loans receivable transactions between related parties
Loans	4,458
Collection	0
Others	(669)
Ending balance	4,844
HORUS SOLAR, S.A. DE C.V. | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	3,323
Changes in Loans receivable transactions between related parties
Loans	11,404
Collection	0
Others	(1,347)
Ending balance	13,380
SUNMEX RENOVABLES, S.A. DE C.V. | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	144
Changes in Loans receivable transactions between related parties
Loans	1,755
Collection	0
Others	(57)
Ending balance	1,842
Kelar S.A | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	42,158
Changes in Loans receivable transactions between related parties
Loans	0
Collection	0
Others	(2,542)
Ending balance	39,616
Chun-cheon Energy Co., Ltd. | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	5,057
Changes in Loans receivable transactions between related parties
Loans	0
Collection	(5,057)
Others	0
Ending balance	0
DE Energia SpA | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	6,632
Changes in Loans receivable transactions between related parties
Loans	0
Collection	0
Others	(400)
Ending balance	6,232
Daehan Wind Power PSC | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	0
Changes in Loans receivable transactions between related parties
Loans	11,852
Collection	0
Others	(1,152)
Ending balance	10,700
PT. Tanjung Power Indonesia | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	0
Changes in Loans receivable transactions between related parties
Loans	777
Collection	0
Others	(72)
Ending balance	705
Bitsolar Energy Co., Ltd., | Gross carrying amount [Member]
Disclosure of Loans transactions between related parties [Line Items]
Beginning balance	0
Changes in Loans receivable transactions between related parties
Loans	3,165
Collection	0
Others	0
Ending balance	₩ 3,165

Borrowings transactions between

Borrowings transactions between related parties (Details) - Korea Development Bank ₩ in Millions	12 Months Ended
	Dec. 31, 2020KRW (₩)
Facility
Disclosure of Borrowings transactions between related parties [Line Items]
Beginning balance	₩ 59,845
Changes in Borrowings transactions between related parties [Abstract]
Borrowings	0
Repayment	(9,552)
Others	0
Ending balance	50,293
Others
Disclosure of Borrowings transactions between related parties [Line Items]
Beginning balance	3,500
Changes in Borrowings transactions between related parties [Abstract]
Borrowings	0
Repayment	(554)
Others	0
Ending balance	2,946
Operating funds
Disclosure of Borrowings transactions between related parties [Line Items]
Beginning balance	179,000
Changes in Borrowings transactions between related parties [Abstract]
Borrowings	152,961
Repayment	(187,511)
Others	(150)
Ending balance	144,300
Syndicated Loan
Disclosure of Borrowings transactions between related parties [Line Items]
Beginning balance	17,085
Changes in Borrowings transactions between related parties [Abstract]
Borrowings	0
Repayment	(1,063)
Others	(99)
Ending balance	15,923
EBL
Changes in Borrowings transactions between related parties [Abstract]
Borrowings	43,485
Repayment	0
Others	(3,392)
Ending balance	₩ 40,093

Guarantees provided between the

Guarantees provided between the related parties (Details) ر.س in Thousands, RM in Thousands, $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2020KRW (₩)		Dec. 31, 2020USD ($)		Dec. 31, 2020SAR (ر.س)	Dec. 31, 2020MYR (RM)
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 | $			$ 900,000
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	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 | $			$ 4,439,920
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	EPS Renewables Holdings, LLC, Santander Bank and others		EPS Renewables Holdings, LLC, Santander Bank and others		EPS Renewables Holdings, LLC, Santander Bank and others	EPS Renewables Holdings, LLC, Santander Bank 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 | $			$ 206,494	[1]
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	EPS Renewables Holdings, LLC, Santander Bank and others		EPS Renewables Holdings, LLC, Santander Bank and others		EPS Renewables Holdings, LLC, Santander Bank and others	EPS Renewables Holdings, LLC, Santander Bank and others
Name of Principal obligor	RE Pioneer Holdings LLC		RE Pioneer Holdings LLC		RE Pioneer Holdings LLC	RE Pioneer Holdings LLC
Amount of guarantees | $			$ 158,718
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, Santander Bank and others		Firstar Development, LLC, Santander Bank and others		Firstar Development, LLC, Santander Bank and others	Firstar Development, LLC, Santander Bank and others
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 | $			$ 135,783	[1]
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	Hana Bank		Hana Bank		Hana Bank	Hana Bank
Name of Principal obligor	Rabigh Electricity Company		Rabigh Electricity Company		Rabigh Electricity Company	Rabigh Electricity Company
Amount of guarantees | ر.س					ر.س 6,508
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	Hana Bank		Hana Bank		Hana Bank	Hana Bank
Name of Principal obligor	Rabigh Electricity Company		Rabigh Electricity Company		Rabigh Electricity Company	Rabigh Electricity Company
Amount of guarantees | ر.س					ر.س 68,054
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
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	Maybank		Maybank		Maybank	Maybank
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 | RM						RM 7,500
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	₩ 4,940
Guarantees for supplemental funding 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	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	₩ 0	[2]
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
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	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	₩ 64,570
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	₩ 2,066
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	₩ 45,041	[3]
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	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	₩ 1,780
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	₩ 210
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		Kookmin Bank		Kookmin Bank	Kookmin Bank
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	₩ 69,591
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	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	₩ 0	[2]
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	₩ 3,065
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	₩ 5,535
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	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	₩ 0	[2]
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	₩ 4,180
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	₩ 5,510
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	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	₩ 0	[2]
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	₩ 5,378
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	₩ 14,814
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	Seokmun Energy Co., Ltd.		Seokmun Energy Co., Ltd.		Seokmun Energy Co., Ltd.	Seokmun Energy Co., Ltd.
Amount of guarantees	₩ 0	[2]
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	₩ 27,518
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	[2]
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	₩ 3,887
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	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	₩ 0	[2]
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	₩ 244,426
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	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	₩ 0	[2]
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	₩ 3,124
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	₩ 17,256
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	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	₩ 0	[2]
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	₩ 22,552
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	[2]
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	Samsung Fire & Marine Insurance Co., Ltd. and others		Samsung Fire & Marine Insurance Co., Ltd. and others		Samsung Fire & Marine Insurance Co., Ltd. and others	Samsung Fire & Marine Insurance Co., Ltd. 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	₩ 13,362
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
Amount of guarantees	₩ 0	[2]
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	₩ 33,063
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	Societe Generale		Societe Generale		Societe Generale	Societe Generale
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	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	₩ 31,897
Guarantees for supplemental funding
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	EWP Barbados 1 SRL		EWP Barbados 1 SRL		EWP Barbados 1 SRL	EWP Barbados 1 SRL
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	₩ 0	[2],[4]
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	₩ 8,187
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	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
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 | $			$ 1,066	[5]
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 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	₩ 2,436
Performance guarantees and guarantees for supplemental funding
Disclosure of Guarantees provided between the related parties [Line Items]
Name of Primary guarantor	Korea Southern Power Co., Ltd.		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	₩ 0	[2]
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	₩ 26,353
Guarantees for supplemental funding and others
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	₩ 8,000	[2]
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	Daegu Green Power Co., Ltd.		Daegu Green Power Co., Ltd.		Daegu Green Power Co., Ltd.	Daegu Green Power Co., Ltd.
Amount of guarantees	₩ 23,045
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	₩ 0
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 | $			$ 57,987
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 | $			$ 3,600
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	[6]
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	₩ 5,027
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	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	₩ 0
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	₩ 3,087
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	SK Securities.Co., LTD., KDB Capital Corporation, and others		SK Securities.Co., LTD., KDB Capital Corporation, and others		SK Securities.Co., LTD., KDB Capital Corporation, and others	SK Securities.Co., LTD., KDB Capital Corporation, and others
Name of Principal obligor	Jeongam Wind Power Co., Ltd.		Jeongam Wind Power Co., Ltd.		Jeongam Wind Power Co., Ltd.	Jeongam Wind 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 Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.		Korea Southern Power Co., Ltd.	Korea Southern Power Co., Ltd.
Name of Guarantee	SK Securities.Co., LTD., KDB Capital Corporation, and others		SK Securities.Co., LTD., KDB Capital Corporation, and others		SK Securities.Co., LTD., KDB Capital Corporation, and others	SK Securities.Co., LTD., KDB Capital Corporation, and others
Name of Principal obligor	Jeongam Wind Power Co., Ltd.		Jeongam Wind Power Co., Ltd.		Jeongam Wind Power Co., Ltd.	Jeongam Wind Power Co., Ltd.
Amount of guarantees	₩ 4,620
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	[7]
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	₩ 7,379
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	[8]
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	[2]
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	[2]
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	₩ 71,449
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	₩ 1,621
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	₩ 1,064
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	₩ 277
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	₩ 1,490
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	₩ 1,092
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	₩ 312
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	₩ 132,774
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 | $			$ 10,038
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 | $			$ 5,271
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	₩ 25
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	[2]
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	₩ 454
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 Operatin Co., Ltd.		Namjeongsusang Solar Power Operatin Co., Ltd.		Namjeongsusang Solar Power Operatin Co., Ltd.	Namjeongsusang Solar Power Operatin Co., Ltd.
Amount of guarantees	₩ 103
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	₩ 4,682
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	₩ 1,096
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	₩ 1,684
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	₩ 29
Guarantees for supplemental funding
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	₩ 0	[2]
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. (formerly, Hyundai Energy Co., Ltd.)		DAYONE Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.)		DAYONE Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.)	DAYONE Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.)
Amount of guarantees	₩ 0	[9]
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. (formerly, Hyundai Energy Co., Ltd.)		DAYONE Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.)		DAYONE Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.)	DAYONE Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.)
Amount of guarantees	₩ 76,800	[2],[10]
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	Korea Development Bank and others		Korea Development Bank and others		Korea Development Bank and others	Korea Development Bank and others
Name of Principal obligor	S-Power Co., Ltd.		S-Power Co., Ltd.		S-Power Co., Ltd.	S-Power Co., Ltd.
Amount of guarantees	₩ 110,292
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	₩ 15,930
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	₩ 18,200
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	₩ 2,500	[2],[11]
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	₩ 2,186
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	₩ 2,368
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	₩ 1,149
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	₩ 4,250
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	₩ 2,195
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	Cheongsong Myeonbongsan Wind Power Plant Co., Ltd.		Cheongsong Myeonbongsan Wind Power Plant Co., Ltd.		Cheongsong Myeonbongsan Wind Power Plant Co., Ltd.	Cheongsong Myeonbongsan Wind Power Plant Co., Ltd.
Amount of guarantees	₩ 4,124
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	Youngam Solar Power Co., Ltd.		Youngam Solar Power Co., Ltd.		Youngam Solar Power Co., Ltd.	Youngam Solar Power Co., Ltd.
Amount of guarantees	₩ 6,042
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	₩ 2,607
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	₩ 11,022
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	₩ 4,197
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	₩ 8,778
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	₩ 3,453
Collateralized money invested
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	[12]
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	[2]
[1]	The credit limits of guarantees to RE Holiday Holdings LLC and RE Barren Ridge 1 Holdings LLC include the credit limits of guarantees to their subsidiaries.
[2]	The Company guarantees to provide supplemental funding for business with respect to excessive business expenses or insufficient repayment of borrowings.
[3]	The common stocks of Dongducheon Dream Power Co., Ltd. held by the Company were pledged as collateral.
[4]	This includes a guarantee for the shareholder's capital payment in connection with the business of 190MW gas complex thermal power plant in Jamaica. EWP Barbados 1 SRL's capital contribution amount is USD 18,400 thousand and there is no residual guarantee amount among total collateral limit.
[5]	This includes a guarantee related to LC for debt repayment allowance provided to DE Energia SpA, a joint venture of the Company.
[6]	The Company provided a payment guarantee to Daehan Wind Power PSC for opening LC for Debt Service Reserve Account (DSRA).
[7]	Controlling and non-controlling common shareholders of Samcheok Eco Materials Co., Ltd. have pre-emption rights, if preferred shareholders intend to sell their shares until December 26, 2023. The promised yield of the preferred stock is guaranteed through the transaction. As of December 31, 2020, the Company has recognized derivative liabilities of KRW6,760 million related to the guarantee. Meanwhile, the Company is under an agreement with Samcheok Eco Materials Co., Ltd. that if a damage incurs related to the fulfillment of obligations pursuant to the mandatory contract of coal ash supply, compensation for the expected amount of the damage should be settled.
[8]	The Company recognized an impairment loss on all of the equity securities of Naepo Green Energy Co., Ltd. before the prior year, and the acquisition cost of the securities provided as collateral is KRW29,200 million.
[9]	The Company recognized an impairment loss on all of the equity securities of DAYONE Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.) before the prior year, and the acquisition cost of the securities provided as collateral is KRW47,067 million.
[10]	Pursuant to the guarantee agreement, the Company recognized other provisions of KRW26,772 million as the possibility of economic benefit outflow to fulfill the obligation was deemed probable and the amount could be reasonably estimated.
[11]	The Company has granted the right to Hana Financial Investment Co., Ltd., as an agent for the creditors to Expressway Solar-light Power Generation Co., Ltd. ("ESPG"), to the effect that in the event of acceleration of ESPG's payment obligations under certain borrowings to such creditors, Hana Financial may demand the Company to dispose of shares in ESPG held by the Company and apply the resulting proceeds to repayment of ESPG's obligations.
[12]	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 W461 million.

Derivatives transactions betwee

Derivatives transactions between related parties (Details) - 12 months ended Dec. 31, 2020 - Korea Development Bank SFr in Thousands, $ in Thousands, $ in Thousands, ₩ in Millions	KRW (₩)	USD ($)	HKD ($)	CHF (SFr)
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2019~2024	2019~2024	2019~2024	2019~2024
Pay, Contract Amount	₩ 177,600
Receive, Contract Amount | $		$ 150,000
Contract Interest rate Pay	1.24%	1.24%	1.24%	1.24%
Contract Interest rate Receive	2.50%	2.50%	2.50%	2.50%
Contract exchange rate	1,184	1,184	1,184	1,184
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2020~2025	2020~2025	2020~2025	2020~2025
Pay, Contract Amount	₩ 241,320
Receive, Contract Amount | $		$ 200,000
Contract Interest rate Pay	0.54%	0.54%	0.54%	0.54%
Contract Interest rate Receive	1.13%	1.13%	1.13%	1.13%
Contract exchange rate	1,206.6	1,206.6	1,206.6	1,206.6
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2015~2025	2015~2025	2015~2025	2015~2025
Pay, Contract Amount	₩ 111,190
Receive, Contract Amount | $		$ 100,000
Contract Interest rate Pay	2.62%	2.62%	2.62%	2.62%
Contract Interest rate Receive	3.25%	3.25%	3.25%	3.25%
Contract exchange rate	1,111.9	1,111.9	1,111.9	1,111.9
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2017~2027	2017~2027	2017~2027	2017~2027
Pay, Contract Amount	₩ 111,610
Receive, Contract Amount | $		$ 100,000
Contract Interest rate Pay	2.31%	2.31%	2.31%	2.31%
Contract Interest rate Receive	3.13%	3.13%	3.13%	3.13%
Contract exchange rate	1,116.1	1,116.1	1,116.1	1,116.1
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2018~2028	2018~2028	2018~2028	2018~2028
Pay, Contract Amount	₩ 108,600
Receive, Contract Amount | $			$ 800,000
Contract Interest rate Pay	2.69%	2.69%	2.69%	2.69%
Contract Interest rate Receive	3.35%	3.35%	3.35%	3.35%
Contract exchange rate	135.75	135.75	135.75	135.75
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2018~2023	2018~2023	2018~2023	2018~2023
Pay, Contract Amount	₩ 170,280
Receive, Contract Amount | $		$ 150,000
Contract Interest rate Pay	2.15%	2.15%	2.15%	2.15%
Contract Interest rate Receive	3.75%	3.75%	3.75%	3.75%
Contract exchange rate	1,135.2	1,135.2	1,135.2	1,135.2
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2019~2027	2019~2027	2019~2027	2019~2027
Pay, Contract Amount	₩ 119,978
Receive, Contract Amount | SFr				SFr 100,000
Contract Interest rate Pay	1.43%	1.43%	1.43%	1.43%
Contract Interest rate Receive	0.05%	0.05%	0.05%	0.05%
Contract exchange rate	1,199.78	1,199.78	1,199.78	1,199.78
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2020~2026	2020~2026	2020~2026	2020~2026
Pay, Contract Amount	₩ 118,910
Receive, Contract Amount | $		$ 100,000
Contract Interest rate Pay	0.61%	0.61%	0.61%	0.61%
Contract Interest rate Receive	1.00%	1.00%	1.00%	1.00%
Contract exchange rate	1,189.1	1,189.1	1,189.1	1,189.1
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2016~2021	2016~2021	2016~2021	2016~2021
Pay, Contract Amount	₩ 121,000
Receive, Contract Amount | $		$ 100,000
Contract Interest rate Pay	2.15%	2.15%	2.15%	2.15%
Contract Interest rate Receive	2.50%	2.50%	2.50%	2.50%
Contract exchange rate	1,210	1,210	1,210	1,210
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	1,126.5	1,126.5	1,126.5	1,126.5
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2018~2023	2018~2023	2018~2023	2018~2023
Pay, Contract Amount	₩ 320,880
Receive, Contract Amount | $		$ 300,000
Contract Interest rate Pay	2.03%	2.03%	2.03%	2.03%
Contract Interest rate Receive	3.75%	3.75%	3.75%	3.75%
Contract exchange rate	1,069.6	1,069.6	1,069.6	1,069.6
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	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	1,173.4	1,173.4	1,173.4	1,173.4
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2018~2021	2018~2021	2018~2021	2018~2021
Pay, Contract Amount	₩ 212,960
Receive, Contract Amount | $		$ 200,000
Contract Interest rate Pay	2.10%	2.10%	2.10%	2.10%
Contract Interest rate Receive	3.00%	3.00%	3.00%	3.00%
Contract exchange rate	1,064.8	1,064.8	1,064.8	1,064.8
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	1,128.9	1,128.9	1,128.9	1,128.9
Cross Currency Interest Rate Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Contract year	2020~2025	2020~2025	2020~2025	2020~2025
Pay, Contract Amount	₩ 122,780
Receive, Contract Amount | $		$ 100,000
Contract Interest rate Pay	0.93%	0.93%	0.93%	0.93%
Contract Interest rate Receive	1.75%	1.75%	1.75%	1.75%
Contract exchange rate	1,227.8	1,227.8	1,227.8	1,227.8
Cross Currency Forward Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Pay, Contract Amount	₩ 104,849
Receive, Contract Amount | $		$ 100,000
Contract exchange rate	1,048.49	1,048.49	1,048.49	1,048.49
Contract date	Dec. 27, 2017	Dec. 27, 2017	Dec. 27, 2017	Dec. 27, 2017
Matrurity date	Jul. 12, 2021	Jul. 12, 2021	Jul. 12, 2021	Jul. 12, 2021
Cross Currency Forward Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Pay, Contract Amount	₩ 5,469
Receive, Contract Amount | $		$ 5,000
Contract exchange rate	1,093.75	1,093.75	1,093.75	1,093.75
Contract date	Dec. 18, 2020	Dec. 18, 2020	Dec. 18, 2020	Dec. 18, 2020
Matrurity date	Jan. 28, 2021	Jan. 28, 2021	Jan. 28, 2021	Jan. 28, 2021
Cross Currency Forward Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Pay, Contract Amount	₩ 5,436
Receive, Contract Amount | $		$ 5,000
Contract exchange rate	1,087.16	1,087.16	1,087.16	1,087.16
Contract date	Dec. 30, 2020	Dec. 30, 2020	Dec. 30, 2020	Dec. 30, 2020
Matrurity date	Feb. 19, 2021	Feb. 19, 2021	Feb. 19, 2021	Feb. 19, 2021
Cross Currency Forward Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Pay, Contract Amount	₩ 1,092
Receive, Contract Amount | $		$ 1,000
Contract exchange rate	1,092.10	1,092.10	1,092.10	1,092.10
Contract date	Dec. 15, 2020	Dec. 15, 2020	Dec. 15, 2020	Dec. 15, 2020
Matrurity date	Jan. 5, 2021	Jan. 5, 2021	Jan. 5, 2021	Jan. 5, 2021
Cross Currency Forward Contract
Disclosure of Derivatives transactions between related parties [Line Items]
Pay, Contract Amount	₩ 6,791
Receive, Contract Amount | $		$ 6,200
Contract exchange rate	1,095.35	1,095.35	1,095.35	1,095.35
Contract date	Dec. 29, 2020	Dec. 29, 2020	Dec. 29, 2020	Dec. 29, 2020
Matrurity date	Jan. 5, 2021	Jan. 5, 2021	Jan. 5, 2021	Jan. 5, 2021

Key management personnel compen

Key management personnel compensation (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of Key management personnel compensation [Abstract]
Salaries	₩ 1,106	₩ 1,315	₩ 1,295
Retirement benefits	24	31	58
Total	₩ 1,130	₩ 1,346	₩ 1,353

Significant non-cash investing

Significant non-cash investing and financing transactions (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Non-Cash Transactions [Abstract]
Transfer from construction-in-progress to other assets	₩ 10,189,527	₩ 14,052,094	₩ 8,656,252
Recognition of asset retirement cost and related provision for decommissioning costs	895,507	2,425,668	310,272
Transfer from provision for disposal of spent nuclear fuel to accrued expenses	395,921	376,103	482,699
Transfer from long-term borrowings and debt securities to current portion of long-term borrowings and debt securities	9,237,883	7,759,284	7,100,846
Transfer from inventory to stored nuclear fuel	1,055,974	1,129,374	0
Transfer of right-of-use assets due to change in accounting policy	₩ 291,334	₩ 5,364,647	₩ 0

Changes in liabilities incurred

Changes in liabilities incurred from financing activities (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]
Beginning balance	₩ 72,946,674	₩ 61,318,433
Cash flows	1,924,810	5,768,637
Increase	275,686	218,800
Changes in accounting policies	0	4,943,584
Effect of exchange rate fluctuations and others	(801,493)	694,320
Increase from the business combination	0	2,900
Ending balance	74,345,677	72,946,674
Borrowings and debt securities
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]
Beginning balance	67,876,541	61,034,627
Cash flows	2,538,787	6,342,074
Increase	0	0
Changes in accounting policies	0	0
Effect of exchange rate fluctuations and others	(690,747)	496,940
Effect of exchange rate fluctuations	(640,304)	494,414
Others	(50,443)	2,526
Increase from the business combination	0	2,900
Ending balance	69,724,581	67,876,541
Lease liabilities
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]
Beginning balance	5,070,133	283,806
Cash flows	(613,977)	(573,437)
Increase	275,686	218,800
Changes in accounting policies	0	4,943,584
Effect of exchange rate fluctuations and others	(110,746)	197,380
Increase from the business combination	0	0
Ending balance	₩ 4,621,096	₩ 5,070,133

Commitments for Expenditure (De

Commitments for Expenditure (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Purchase of cable (PVC,1C,2000SQ) 153,000M and others (Shin-Bupyung-Youngseo)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	₩ 56,574	₩ 56,408
Commitments for Expenditure Remaining liability balances	16,038	24,721
Purchase of cable (PVC, 1C, 2500SQ) 103,374M and others (Bukdangjin-Shintangjung)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	45,390	45,390
Commitments for Expenditure Remaining liability balances	32,876	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	29,898	36,143
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	8,328	15,300
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	2,244	9,700
Purchase of cable (FR CNCO-W,1C,325SQ) 1,400,000
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	59,716	59,716
Commitments for Expenditure Remaining liability balances	37,249	37,249
Purchase of switch (Eco) 9,360 units
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	40,631	40,631
Commitments for Expenditure Remaining liability balances	24,031	24,031
Purchase of cable (TR CNCE-W/AL, 1C, 400SQ) 2,654,400M
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	35,708	36,063
Commitments for Expenditure Remaining liability balances	0	6,243
Purchase of cable (TR CNCE-W,1C,600SQ) 551,200M
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	37,288	0
Commitments for Expenditure Remaining liability balances	23,100	0
Purchase of cable (TR CNCE-W/AL,1C,400SQ) 4,464,000M
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	82,622	0
Commitments for Expenditure Remaining liability balances	51,130	0
Purchase of cable (FR CNCO-W,1C,325SQ) 1,092,000M
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	42,068	0
Commitments for Expenditure Remaining liability balances	35,358	0
Concrete pole (10M, general purpose, 350KGF) 102,435 ea and five other equipments
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	91,889	0
Commitments for Expenditure Remaining liability balances	80,904	0
Construction of Shin-Kori units (#5,6)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	8,625,387	8,625,387
Commitments for Expenditure Remaining liability balances	3,256,117	4,479,956
Construction of Shin-Hanul units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	9,443,635	8,306,149
Commitments for Expenditure Remaining liability balances	160,512	0
Other 20 contracts
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	107,586	352,710
Commitments for Expenditure Remaining liability balances	58,466	122,890
Service of designing Seoul Combined units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	31,841	30,778
Commitments for Expenditure Remaining liability balances	984	2,119
Purchase of main machine for construction of Seoul Combined units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	331,249	331,249
Commitments for Expenditure Remaining liability balances	0	15,918
Construction of Seoul Combined units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	409,597	387,722
Commitments for Expenditure Remaining liability balances	0	31,150
Service of designing Shin-Boryeong units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	121,163	120,668
Commitments for Expenditure Remaining liability balances	521	888
Purchase of main machine for construction of Shin-Boryeong units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	816,317	816,317
Commitments for Expenditure Remaining liability balances	0	4,955
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	29,042	43,388
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	8,279	10,736
Electricity construction of Shin-Seocheon thermal power plant
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	282,234	231,196
Commitments for Expenditure Remaining liability balances	13,524	87,874
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	11,182	12,088
Service of designing Taean units (#9,10)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	112,813	112,483
Commitments for Expenditure Remaining liability balances	12,933	12,862
Purchase of gas turbine and turbine equipment of Gimpo combined heat & power plant
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	104,600	104,600
Commitments for Expenditure Remaining liability balances	41,840	104,600
Purchase of steam turbine, HRSG and POWER BLOCK of Gimpo combined heat & power plant
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	210,900	0
Commitments for Expenditure Remaining liability balances	147,630	0
Purchase of coal handling machine for construction of Samcheok units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	285,158	282,927
Commitments for Expenditure Remaining liability balances	22,751	42,785
Purchase of furnace main equipment for construction of Samcheok units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	1,065,141	1,066,824
Commitments for Expenditure Remaining liability balances	11,609	11,771
Purchase of turbine main equipment for Samcheok units (#1,2)
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	211,349	223,550
Commitments for Expenditure Remaining liability balances	125	132
Purchase of main equipment for Namjeju
Disclosure of Commitments for Expenditure [Line Items]
Commitments for Expenditure amounts	140,144	138,486
Commitments for Expenditure Remaining liability balances	₩ 112	₩ 84,982

Contracts for inventory purchas

Contracts for inventory purchase commitment (Details)	12 Months Ended
	Dec. 31, 2020
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	2019 ~ 2030
Contracted amounts	17,667 Ton SWU

Litigation Case (Details)

Litigation Case (Details) ₩ in Millions	Dec. 31, 2020KRW (₩)₩ / shares	Dec. 31, 2019KRW (₩)₩ / shares
As the defendant
Litigation Case [Line Items]
Number of cases | ₩ / shares	663	586
Claim amount | ₩	₩ 550,535	₩ 697,835
As the plaintiff
Litigation Case [Line Items]
Number of cases | ₩ / shares	200	199
Claim amount | ₩	₩ 729,798	₩ 707,287

Commitments and Contingencies D

Commitments and Contingencies Disclosure (Details) - 12 months ended Dec. 31, 2020 ₱ in Thousands, € in Thousands, ₨ in Thousands, ر.س in Thousands, د.إ in Thousands, ¥ in Thousands, RM in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, ₩ in Millions	KRW (₩)	USD ($)	EUR (€)	PHP (₱)	JPY (¥)	AED (د.إ)	CAD ($)	INR (₨)	SAR (ر.س)	MYR (RM)	MXN ($)
Commitments on bank-overdraft
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Nonghyup Bank and others
Credit limit | ₩	₩ 1,936,500
Used amount | ₩	₩ 229,960
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
Credit limit | ₩	₩ 1,150,000
Used amount | ₩	₩ 1,150,000
Limit amount available for card
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank and others
Credit limit | ₩	₩ 47,104
Used amount | ₩	₩ 5,378
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 | ₩	₩ 1,752,333
Used amount | ₩	₩ 957,924
Loan limit
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	DBS Bank and others
Credit limit		$ 1,809,700
Used amount		55,393
Certification of payment on payables from foreign country
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Nonghyup Bank
Credit limit		8,700
Used amount		7,912
Certification of payment on L/C
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Shinhan Bank and others
Credit limit		938,400
Used amount		90,240
Certification of payment on L/C
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Mizuho Bank
Credit limit											$ 3,666
Used amount											3,666
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Seoul Guarantee Insurance and others
Credit limit | ₩	₩ 66,890
Used amount | ₩	₩ 59,677
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	First Abu Dhabi Bank and others
Credit limit		1,036,334
Used amount		834,223
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Korea Development Bank and others
Credit limit | ¥					¥ 637,670
Used amount | ¥					637,670
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank
Credit limit | €			€ 4,065
Used amount | €			4,065
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Shinhan Bank
Credit limit | ₨								₨ 6,806
Used amount | ₨								6,806
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank
Credit limit							$ 148
Used amount							$ 148
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Maybank
Credit limit | RM										RM 7,500
Used amount | RM										RM 7,500
Certification of performance guarantee on contract
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank
Credit limit | ر.س									ر.س 68,054
Used amount | ر.س									68,054
Certification of bidding
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank
Credit limit		10,000
Used amount		197
Certification of bidding
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank
Credit limit | €			2
Used amount | €			€ 2
Advance payment bond, Warranty bond, Retention bond and others
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Seoul Guarantee Insurance
Credit limit | ₩	₩ 40,153
Used amount | ₩	₩ 40,153
Advance payment bond, Warranty bond, Retention bond and others
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Export-Import Bank of Korea and others
Credit limit		550,616
Used amount		498,761
Advance payment bond, Warranty bond, Retention bond and others
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank
Credit limit | 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
Credit limit											20,538
Used amount											20,538
Other commitments
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Nonghyup Bank and others
Credit limit | ₩	₩ 654,162
Used amount | ₩	₩ 32,009
Other commitments
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Export-Import Bank of Korea and others
Credit limit		2,268,158
Used amount		1,819,226
Other commitments
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Shinhan Bank
Credit limit | ¥					381,210
Used amount | ¥					¥ 381,210
Other commitments
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Standard Chartered
Credit limit | د.إ						د.إ 50
Used amount | د.إ						د.إ 50
Other commitments
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Shinhan Bank
Credit limit											6,471
Used amount											$ 4,901
Inclusive credit
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank
Credit limit | ₩	₩ 8,000
Used amount | ₩	₩ 927
Inclusive credit
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Hana Bank and others
Credit limit		30,722
Used amount		17,236
Inclusive credit
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	Shinhan Bank
Credit limit | ₨								70,028
Used amount | ₨								₨ 70,028
Trade finance
Commitments and Contingencies Disclosure [Line Items]
Financial institutions	BNP Paribas and others
Credit limit		750,000
Used amount		$ 0

Assets pledged as collateral (D

Assets pledged as collateral (Details) - 12 months ended Dec. 31, 2020 JD in Thousands, $ in Thousands, ₩ in Millions		KRW (₩)	USD ($)	JOD (JD)
Property, plant and equipment and others
Disclsoure of assets pledged as collateral [Line Items]
Name of Guarantor		Mira Power Limited
Name of Guarantee		International Finance Corporation and others
Value of collateral | $	[1]		$ 275,600
Description of assets pledged as collateral description		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	[2]	₩ 171,600
Description of assets pledged as collateral description		Collateral for borrowings
Property, plant and equipment and others
Disclsoure of assets pledged as collateral [Line Items]
Name of Guarantor		SE Green Energy Co., Ltd.
Name of Guarantee		DB Insurance Co., Ltd. and others
Value of collateral	[2]	₩ 149,500
Description of assets pledged as collateral description		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	[2]	₩ 327,800
Description of assets pledged as collateral description		Collateral for borrowings
Land, buildings, structures and machinery 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	[2]	₩ 110,500
Description of assets pledged as collateral description		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	[2]	₩ 396,120
Description of assets pledged as collateral description		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		Samsung Fire & Marine Insurance Co., Ltd. And others
Value of collateral	[2]	₩ 110,240
Description of assets pledged as collateral description		Collateral for borrowings
Utility plant 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	[2]	₩ 293,400
Description of assets pledged as collateral description		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	[1]			JD 236,570
Description of assets pledged as collateral description		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 | $	[1]		$ 401,277
Description of assets pledged as collateral description		Collateral for debt securities
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	[2]	₩ 276,960
Description of assets pledged as collateral description		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	[2]	₩ 521,281
Description of assets pledged as collateral description		Collateral for borrowings
[1]	This is based on the amount of loan commitment limit.
[2]	As of December 31, 2020, the Company has established guarantees for pledge for transfer of rights of long-term borrowings, pledge for insurance claims, pledge for shares, etc.

Disclosure of detailed informat

Disclosure of detailed information about business combination (Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2020KRW (₩)
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	₩ 166,700	[1]
Fair value of the shares owned before the acquisition	59,058
Fair value of transfer price	225,758
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 KRW10,000 million as of December 31, 2019, has been received during the current year.

Disclosure of Net cash outflows

Disclosure 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

Disclosure of transactions reco

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, 2020KRW (₩)
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	Fees for legal service, due diligence and others relating to the business combination amounted to KRW24 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 (Details)

Subsequent Events (Details) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2020KRW (₩)	Dec. 31, 2020USD ($)
Unsecured corporate bond (Global bond)
Subsequent Events - Issuance of bonds [Line Items]
company name	Korea Hydro & Nuclear Power Co., Ltd.
Issue date	Apr. 27, 2021
Maturity	Apr. 27, 2026
Interest rate (%)	1.25%	1.25%
Amounts issued for the subsequent period | $		$ 500,000
Corporate bond
Subsequent Events - Issuance of bonds [Line Items]
company name	Korea South-East Power Co., Ltd.
Issue date	Jan. 26, 2021
Maturity	Jan. 26, 2031
Interest rate (%)	1.90%	1.90%
Amounts issued for the subsequent period	₩ 180,000
Corporate bond
Subsequent Events - Issuance of bonds [Line Items]
company name	Korea South-East Power Co., Ltd.
Issue date	Jan. 26, 2021
Maturity	Jan. 26, 2041
Interest rate (%)	1.97%	1.97%
Amounts issued for the subsequent period	₩ 90,000
Corporate bond
Subsequent Events - Issuance of bonds [Line Items]
company name	Korea South-East Power Co., Ltd.
Issue date	Jan. 26, 2021
Maturity	Jan. 26, 2051
Interest rate (%)	1.96%	1.96%
Amounts issued for the subsequent period	₩ 30,000
Corporate bond
Subsequent Events - Issuance of bonds [Line Items]
company name	Korea South-East Power Co., Ltd.
Issue date	Apr. 8, 2021
Maturity	Apr. 8, 2026
Interest rate (%)	1.82%	1.82%
Amounts issued for the subsequent period	₩ 140,000
Corporate bond
Subsequent Events - Issuance of bonds [Line Items]
company name	Korea South-East Power Co., Ltd.
Issue date	Apr. 8, 2021
Maturity	Apr. 8, 2028
Interest rate (%)	1.99%	1.99%
Amounts issued for the subsequent period	₩ 50,000
Corporate bond
Subsequent Events - Issuance of bonds [Line Items]
company name	Korea Midland Power Co., Ltd.
Issue date	Apr. 2, 2021
Maturity	Apr. 2, 2024
Interest rate (%)	1.45%	1.45%
Amounts issued for the subsequent period	₩ 90,000
Corporate bond
Subsequent Events - Issuance of bonds [Line Items]
company name	Korea Midland Power Co., Ltd.
Issue date	Apr. 21, 2021
Maturity	Apr. 21, 2026
Interest rate (%)	1.85%	1.85%
Amounts issued for the subsequent period	₩ 190,000
Corporate bond
Subsequent Events - Issuance of bonds [Line Items]
company name	Korea Western Power Co., Ltd.
Issue date	Apr. 29, 2021
Maturity	Apr. 29, 2024
Interest rate (%)	1.39%	1.39%
Amounts issued for the subsequent period	₩ 60,000
Corporate bond
Subsequent Events - Issuance of bonds [Line Items]
company name	Korea Western Power Co., Ltd.
Issue date	Apr. 29, 2021
Maturity	Apr. 29, 2026
Interest rate (%)	1.87%	1.87%
Amounts issued for the subsequent period	₩ 150,000
Corporate bond
Subsequent Events - Issuance of bonds [Line Items]
company name	Korea Western Power Co., Ltd.
Issue date	Apr. 29, 2021
Maturity	Apr. 29, 2031
Interest rate (%)	2.18%	2.18%
Amounts issued for the subsequent period	₩ 20,000
Unsecured corporate bond (Global bond 21)
Subsequent Events - Issuance of bonds [Line Items]
company name	Korea Southern Power Co., Ltd.
Issue date	Jan. 27, 2021
Maturity	Jan. 27, 2026
Interest rate (%)	0.75%	0.75%
Amounts issued for the subsequent period | $		$ 450,000
Corporate bond
Subsequent Events - Issuance of bonds [Line Items]
company name	Korea Southern Power Co., Ltd.
Issue date	Apr. 14, 2021
Maturity	Apr. 14, 2022
Interest rate (%)	0.86%	0.86%
Amounts issued for the subsequent period	₩ 150,000
Corporate bond
Subsequent Events - Issuance of bonds [Line Items]
company name	Korea Southern Power Co., Ltd.
Issue date	Apr. 14, 2021
Maturity	Apr. 14, 2023
Interest rate (%)	1.14%	1.14%
Amounts issued for the subsequent period	₩ 70,000