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Investments in Associates 1 (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of associates [line items]      
Acquisition cost ₩ 3,059,835 ₩ 2,481,761  
Book value ₩ 5,232,373 ₩ 4,250,787 ₩ 4,251,802
Korea Gas Corporation      
Disclosure of associates [line items]      
Key operation activities Importing and wholesaling LNG Importing and wholesaling LNG [1]  
Location Korea Korea  
Percentage of ownership 20.47% 20.47% [1]  
Acquisition cost ₩ 94,500 ₩ 94,500 [1]  
The fair value of associates 738,990 584,010  
Book value ₩ 1,815,513 ₩ 1,647,325 [1] 1,693,967
Korea Electric Power Industrial Development Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Electricity metering and others Electricity metering and others  
Location Korea Korea  
Percentage of ownership 29.00% 29.00%  
Acquisition cost ₩ 4,727 ₩ 4,727  
The fair value of associates 115,339 45,048  
Book value ₩ 24,617 ₩ 25,630 25,393
YTN Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Broadcasting Broadcasting  
Location Korea Korea  
Percentage of ownership 21.43% 21.43%  
Acquisition cost ₩ 59,000 ₩ 59,000  
The fair value of associates 26,550 27,000  
Book value ₩ 51,828 ₩ 40,549 39,747
Gangwon Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 15.00% 15.00%  
Acquisition cost ₩ 5,725 ₩ 5,725  
Book value ₩ 10,554 ₩ 11,443 12,327
Hyundai Green Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation equipment consignment and operation service Power generation  
Location Korea Korea  
Percentage of ownership 29.00% 29.00%  
Acquisition cost ₩ 88,885 ₩ 88,885  
Book value ₩ 121,955 ₩ 132,774 124,253
Korea Power Exchange      
Disclosure of associates [line items]      
Key operation activities Management of power market and others Management of power market and others  
Location Korea Korea  
Percentage of ownership 100.00% 100.00%  
Acquisition cost ₩ 127,839 ₩ 127,839  
Book value 269,728 269,122 258,899
Dayone Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.)      
Disclosure of associates [line items]      
Unrecognized equity interest (1,244) (14,035)  
Accumulated unrecognized equity interest ₩ 23,452 ₩ 24,696  
Taebaek Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 25.00% 25.00%  
Acquisition cost ₩ 3,810 ₩ 3,810  
Book value ₩ 6,800 ₩ 6,392 7,039
Taeback Guinemi Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 25.00% 25.00%  
Acquisition cost ₩ 3,420 ₩ 3,420  
Book value ₩ 3,357 ₩ 3,087 2,553
Pyeongchang Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 25.00% 25.00%  
Acquisition cost ₩ 3,875 ₩ 3,875  
Book value ₩ 5,411 ₩ 5,027 5,877
Daeryun Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 9.34% 9.34%  
Acquisition cost ₩ 40,854 ₩ 40,854  
Book value ₩ 25,426 ₩ 26,353 26,247
Changjuk Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 30.00% 30.00%  
Acquisition cost ₩ 3,801 ₩ 3,801  
Book value ₩ 8,355 ₩ 7,867 8,520
KNH Solar Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 27.00% 27.00%  
Acquisition cost ₩ 1,296 ₩ 1,296  
Book value ₩ 2,278 ₩ 2,436 2,382
SPC Power Corporation      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Philippines Philippines  
Percentage of ownership 38.00% 38.00%  
Acquisition cost ₩ 20,635 ₩ 20,635  
The fair value of associates 203,589 139,698  
Book value ₩ 65,046 ₩ 69,912 63,583
Gemeng International Energy Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location China China  
Percentage of ownership 34.00% 34.00%  
Acquisition cost ₩ 413,153 ₩ 413,153  
Book value ₩ 595,218 ₩ 679,708 670,896
PT. Cirebon Electric Power      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Indonesia Indonesia  
Percentage of ownership 27.50% 27.50%  
Acquisition cost ₩ 40,365 ₩ 40,365  
Book value ₩ 121,969 ₩ 117,811 123,425
KNOC Nigerian East Oil Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Resources development Resources development  
Location Nigeria Nigeria  
Percentage of ownership 14.63% 14.63%  
Acquisition cost ₩ 12 ₩ 12  
Book value ₩ 0 ₩ 0 0
KNOC Nigerian West Oil Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Resources development Resources development  
Location Nigeria Nigeria  
Percentage of ownership 14.63% 14.63%  
Acquisition cost ₩ 12 ₩ 12  
Book value ₩ 0 ₩ 0 0
PT Wampu Electric Power      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Indonesia Indonesia  
Percentage of ownership 46.00% 46.00%  
Acquisition cost ₩ 21,292 ₩ 21,292  
Book value ₩ 35,077 ₩ 27,865 29,355
PT. Bayan Resources TBK      
Disclosure of associates [line items]      
Key operation activities Resources development Resources development  
Location Indonesia Indonesia  
Percentage of ownership 20.00% 20.00%  
Acquisition cost ₩ 615,860 ₩ 615,860  
The fair value of associates 1,495,801 798,510  
Book value ₩ 661,289 ₩ 425,234 445,141
S-Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 49.00% 49.00%  
Acquisition cost ₩ 132,300 ₩ 132,300  
Book value ₩ 122,786 ₩ 110,292 115,784
Pioneer Gas Power Limited      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location India India  
Percentage of ownership 38.50% 38.50%  
Acquisition cost ₩ 49,831 ₩ 49,831  
Book value 0 0 0
Unrecognized equity interest 21,691 15,824  
Accumulated unrecognized equity interest ₩ 37,629 ₩ 15,938  
Eurasia Energy Holdings      
Disclosure of associates [line items]      
Key operation activities Power generation and resources development Power generation and resources development  
Location Russia Russia  
Percentage of ownership 40.00% 40.00%  
Acquisition cost ₩ 461 ₩ 461  
Book value 0 0 0
Unrecognized equity interest 15 (10)  
Accumulated unrecognized equity interest ₩ 190 ₩ 175  
Xe-Pian Xe-Namnoy Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Laos Laos  
Percentage of ownership 25.00% 25.00%  
Acquisition cost ₩ 87,426 ₩ 87,426  
Book value 92,441 ₩ 64,570 72,935
Hadong Mineral Fiber Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities   Recycling fly ashes  
Location   Korea  
Percentage of ownership   8.33%  
Acquisition cost   ₩ 50  
Book value 0 0 0
Unrecognized equity interest 0 0  
Accumulated unrecognized equity interest ₩ 0 ₩ 2  
PT. Mutiara Jawa      
Disclosure of associates [line items]      
Key operation activities Manufacturing and operating floating coal terminal Manufacturing and operating floating coal terminal  
Location Indonesia Indonesia  
Percentage of ownership 29.00% 29.00%  
Acquisition cost ₩ 2,978 ₩ 2,978  
Book value ₩ 2,569 ₩ 1,780 1,438
Samcheok Eco Materials Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Recycling fly ashes Recycling fly ashes  
Location Korea Korea  
Percentage of ownership 2.35% 2.35%  
Acquisition cost ₩ 686 ₩ 686  
Book value ₩ 0 ₩ 0 0
Noeul Green Energy Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 29.00% 29.00%  
Acquisition cost ₩ 1,740 ₩ 1,740  
Book value 3,808 4,197 6,610
Naepo Green Energy Co., Ltd.      
Disclosure of associates [line items]      
Book value   0 0
Unrecognized equity interest 5,469 (7,003)  
Accumulated unrecognized equity interest ₩ 7,747 ₩ 2,278  
Goseong Green Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 29.00% 1.12%  
Acquisition cost ₩ 262,740 ₩ 2,900  
Book value ₩ 260,858 ₩ 2,186 2,340
Gangneung Eco Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 1.61% 1.61%  
Acquisition cost ₩ 2,900 ₩ 2,900  
Book value ₩ 2,288 ₩ 2,368 2,430
Shin Pyeongtaek Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 40.00% 40.00%  
Acquisition cost ₩ 72,000 ₩ 72,000  
Book value ₩ 93,074 ₩ 69,591 66,956
Haeng Bok Do Si Photovoltaic Power Co Ltd      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 28.00% 28.00%  
Acquisition cost ₩ 194 ₩ 194  
Book value ₩ 223 ₩ 210 215
Dongducheon Dream Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 33.61% 33.61%  
Acquisition cost ₩ 148,105 ₩ 148,105  
Book value ₩ 74,198 ₩ 80,637 76,547
Jinbhuvish Power Generation Pvt. Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location India India  
Percentage of ownership 5.16% 5.16%  
Acquisition cost ₩ 9,000 ₩ 9,000  
Book value ₩ 0 ₩ 0 0
Daejung Offshore Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 46.59% 46.59%  
Acquisition cost ₩ 5,190 ₩ 5,190  
Book value ₩ 1,704 ₩ 2,165 2,361
GS Donghae Electric Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 34.00% 34.00%  
Acquisition cost ₩ 204,000 ₩ 204,000  
Book value ₩ 243,772 ₩ 244,426 255,983
Daegu Photovoltaic Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 29.00% 29.00%  
Acquisition cost ₩ 1,230 ₩ 1,230  
Book value ₩ 2,342 ₩ 2,066 2,060
Busan Green Energy Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 29.00% 29.00%  
Acquisition cost ₩ 5,243 ₩ 5,243  
Book value ₩ 5,032 ₩ 8,778 10,637
Gunsan Bio Energy Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 18.87% 18.87%  
Acquisition cost ₩ 1,000 ₩ 1,000  
Book value 0 0 0
Unrecognized equity interest 282 290  
Accumulated unrecognized equity interest ₩ 3,864 ₩ 3,582  
Korea Electric Vehicle Charging Service      
Disclosure of associates [line items]      
Key operation activities Electric vehicle charge service Electric vehicle charge service  
Location Korea Korea  
Percentage of ownership 17.50% 28.00%  
Acquisition cost ₩ 2,800 ₩ 2,800  
Book value ₩ 1,250 ₩ 576 1,063
Hansuwon KNP Co., Ltd. (formerly, Korea Nuclear Partners Co., Ltd.) [Member]      
Disclosure of associates [line items]      
Key operation activities Electric material agency    
Location Korea    
Percentage of ownership 28.98%    
Acquisition cost ₩ 537    
Book value ₩ 219    
Korea Nuclear Partners Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities   Electric material agency  
Location   Korea  
Percentage of ownership   28.98%  
Acquisition cost   ₩ 537  
Book value   ₩ 200 0
Korea Electric Power Corporation Fund      
Disclosure of associates [line items]      
Key operation activities Developing electric enterprises Developing electric enterprises  
Location Korea Korea  
Percentage of ownership 98.09% 98.09%  
Acquisition cost ₩ 48,410 ₩ 51,500  
Book value ₩ 47,983 ₩ 41,926 41,126
Energy Infra Asset Management Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Asset management Asset management  
Location Korea Korea  
Percentage of ownership 9.90% 9.90%  
Acquisition cost ₩ 297 ₩ 297  
Book value ₩ 1,066 ₩ 938 791
Daegu clean Energy Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Renewable power generation Renewable power generation  
Location Korea Korea  
Percentage of ownership 28.00% 28.00%  
Acquisition cost ₩ 140 ₩ 140  
Book value ₩ 12 ₩ 12 13
Yaksu ESS Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Installing ESS related equipment Installing ESS related equipment  
Location Korea Korea  
Percentage of ownership 29.00% 29.00%  
Acquisition cost ₩ 210 ₩ 210  
Book value ₩ 716 ₩ 454 516
Nepal Water & Energy Development Company Private Ltd      
Disclosure of associates [line items]      
Key operation activities Construction and operation of utility plant Construction and operation of utility plant  
Location Nepal Nepal  
Percentage of ownership 69.06% 60.35%  
Acquisition cost ₩ 70,228 ₩ 50,268  
Book value ₩ 66,333 ₩ 42,677 31,145
Gwangyang Green Energy Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 20.00% 20.00%  
Acquisition cost ₩ 26,800 ₩ 2,000  
Book value ₩ 25,466 ₩ 926 948
PND Solar Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 29.00% 29.00%  
Acquisition cost ₩ 1,250 ₩ 1,250  
Book value ₩ 1,229 ₩ 1,149 1,144
Hyundai Ecoenergy Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 19.00% 19.00%  
Acquisition cost ₩ 3,610 ₩ 3,610  
Book value ₩ 5,572 ₩ 4,250 3,781
YeongGwang Yaksu Wind Electric Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 9.63% 9.63%  
Acquisition cost ₩ 533 ₩ 533  
Book value ₩ 233 ₩ 312 386
Green Energy Electricity Generation Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 29.00% 29.00%  
Acquisition cost ₩ 1,189 ₩ 1,189  
Book value ₩ 1,713 ₩ 25 163
Korea Energy Solution Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities R & D R & D  
Location Korea Korea  
Percentage of ownership 20.00% 20.00%  
Acquisition cost ₩ 300 ₩ 300  
Book value ₩ 123 ₩ 197 259
ITR Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities R & D R & D  
Location Korea Korea  
Percentage of ownership 20.00% 20.00%  
Acquisition cost ₩ 50 ₩ 50  
Book value ₩ 32 ₩ 40 33
Structure test network Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Technical testing and consulting Technical testing and consulting  
Location Korea Korea  
Percentage of ownership 20.00% 20.00%  
Acquisition cost ₩ 25 ₩ 25  
Book value ₩ 306 ₩ 27 21
Namjeongsusang Solar Power Operation Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 15.00% 15.00%  
Acquisition cost ₩ 969 ₩ 969  
Book value ₩ 361 ₩ 103 812
Indeck Niles Development, LLC      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location USA USA  
Percentage of ownership 56.25% [2] 24.08%  
Acquisition cost ₩ 268,113 [2] ₩ 45,562  
Book value ₩ 246,273 [2] ₩ 20,627 0
Indeck Niles Asset Management, LLC      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location USA USA  
Percentage of ownership 33.33% 33.33%  
Acquisition cost ₩ 0 ₩ 0  
Book value ₩ 111 ₩ 101 87
Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1      
Disclosure of associates [line items]      
Key operation activities Holding company Holding company  
Location Korea Korea  
Percentage of ownership 49.00% 49.00%  
Acquisition cost ₩ 7,112 ₩ 7,300  
Book value ₩ 7,138 ₩ 7,326 7,126
Suwon New Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 39.90% 39.90%  
Acquisition cost ₩ 798 ₩ 798  
Book value ₩ 1,035 ₩ 1,054 798
KPGE Inc.      
Disclosure of associates [line items]      
Key operation activities Power generation materials business Power generation materials business  
Location Korea Korea  
Percentage of ownership 29.00% 29.00%  
Acquisition cost ₩ 287 ₩ 287  
Book value ₩ 309 ₩ 287 287
Gwangbaek Solar Power Investment Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 44.00% 44.00%  
Acquisition cost ₩ 4,757 ₩ 4,757  
Book value ₩ 4,806 ₩ 4,682 2,054
Go deok Clean Energy Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Fuel cell generation Fuel cell generation  
Location Korea Korea  
Percentage of ownership 40.00% 61.00%  
Acquisition cost ₩ 5,560 ₩ 1,830  
Book value ₩ 4,302 ₩ 960  
SureDataLab Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities R & D R & D  
Location Korea Korea  
Percentage of ownership 23.95% 23.95%  
Acquisition cost ₩ 126 ₩ 126  
Book value ₩ 128 ₩ 85 0
SEP Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities R & D R & D  
Location Korea Korea  
Percentage of ownership 21.26% 21.26%  
Acquisition cost ₩ 27 ₩ 27  
Book value ₩ 7 ₩ 14 0
Hankook Electric Power Information Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities R & D R & D  
Location Korea Korea  
Percentage of ownership 25.25% 25.25%  
Acquisition cost ₩ 38 ₩ 38  
Book value ₩ 161 ₩ 139 0
Tronix Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities R & D R & D  
Location Korea Korea  
Percentage of ownership 20.00% 20.00%  
Acquisition cost ₩ 75 ₩ 75  
Book value ₩ 109 ₩ 119 0
O2&B Global Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities R & D R & D  
Location Korea Korea  
Percentage of ownership 20.00% 20.00%  
Acquisition cost ₩ 25 ₩ 25  
Book value ₩ 35 ₩ 22 0
Muan Sunshine Solar Power Plant Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 20.00% 20.00%  
Acquisition cost ₩ 1,570 ₩ 1,570  
Book value ₩ 1,268 ₩ 1,096 0
Bigeum Resident Photovoltaic Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 29.90% 29.90%  
Acquisition cost ₩ 1 ₩ 1  
Book value 0 0 0
Unrecognized equity interest 182 116  
Accumulated unrecognized equity interest 298 ₩ 116  
Jeju SolarOne Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities   Power generation  
Location   Korea  
Percentage of ownership   10.00%  
Acquisition cost   ₩ 161  
Book value ₩ 0 ₩ 159 0
Goesan Solar Park Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 29.00% 29.00%  
Acquisition cost ₩ 1,276 ₩ 1,276  
Book value ₩ 1,927 ₩ 1,684 0
Saemangeum Heemang Photovoltaic Co.,Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 35.00% 35.00%  
Acquisition cost ₩ 11,022 ₩ 11,022  
Book value ₩ 10,238 ₩ 11,022 0
Bitgoel Eco Energy Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 29.00% 29.00%  
Acquisition cost ₩ 4,640 ₩ 29  
Book value ₩ 4,356 ₩ 29 0
Jeju Gimnyeong Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 30.00% 30.00%  
Acquisition cost ₩ 714 ₩ 714  
Book value ₩ 911 ₩ 1,578 0
Seoroseoro Sunny Power Plant Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 42.58% 19.46%  
Acquisition cost ₩ 706 ₩ 230  
Book value ₩ 721 ₩ 230 0
Muan Solar Park Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 20.00% 19.00%  
Acquisition cost ₩ 4,400 ₩ 4,180  
Book value ₩ 6,083 ₩ 4,180 0
YuDang Solar Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 20.00% 20.00%  
Acquisition cost ₩ 360 ₩ 360  
Book value ₩ 565 ₩ 360 0
Anjwa Smart Farm & Solar City Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 20.00% 19.50%  
Acquisition cost ₩ 5,651 ₩ 5,510  
Book value ₩ 6,784 ₩ 5,510 0
Daewon Green Energy Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location Korea Korea  
Percentage of ownership 25.36% 25.36%  
Acquisition cost ₩ 3,910 ₩ 3,910  
Book value 3,877 3,910 ₩ 0
Samcheok Eco Materials Co., Ltd      
Disclosure of associates [line items]      
Unrecognized equity interest (323) (3)  
Accumulated unrecognized equity interest ₩ 462 785  
G.GURU Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities R & D    
Location Korea    
Percentage of ownership 24.65%    
Acquisition cost ₩ 493    
Book value ₩ 403    
UD4M Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities [3] R & D    
Location Korea    
Percentage of ownership [3] 12.50%    
Acquisition cost [3] ₩ 75    
Book value [3] ₩ 144    
Dongbu Highway Solar Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation    
Location Korea    
Percentage of ownership 20.00%    
Acquisition cost ₩ 190    
Book value ₩ 265    
Seobu Highway Solar Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation    
Location Korea    
Percentage of ownership 20.00%    
Acquisition cost ₩ 195    
Book value ₩ 289    
Korea Energy Data Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities R & D    
Location Korea    
Percentage of ownership 29.37%    
Acquisition cost ₩ 60    
Book value ₩ 62 0  
Gangneung Sacheon Fuel Cell Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation    
Location Korea    
Percentage of ownership [4] 65.00%    
Acquisition cost [4] ₩ 1,950    
Book value [4] ₩ 1,878    
KOSTURE Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities [3] Coal recycling business    
Location Korea    
Percentage of ownership [3] 0.26%    
Acquisition cost [3] ₩ 0    
Book value [3] ₩ 0    
Digital Innovation Growth Fund      
Disclosure of associates [line items]      
Key operation activities [5] Holding company    
Location Korea    
Percentage of ownership [5] 76.92%    
Acquisition cost [5] ₩ 10,000    
Book value ₩ 9,890 [5] 0  
Taebaek Gadeoksan Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation    
Location Korea    
Percentage of ownership 39.65%    
Acquisition cost ₩ 12,570    
Book value ₩ 16,495 0  
Chuncheon Green Energy Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation    
Location Korea    
Percentage of ownership [6] 68.00%    
Acquisition cost [6] ₩ 3,400    
Book value ₩ 3,372 [6] 0  
Yeomsubong Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation    
Location Korea    
Percentage of ownership 48.72%    
Acquisition cost ₩ 95    
Book value ₩ 95 0  
Yeongyang Wind Power Corporation II      
Disclosure of associates [line items]      
Key operation activities Power generation    
Location Korea    
Percentage of ownership 30.00%    
Acquisition cost ₩ 7,965    
Book value ₩ 7,965 0  
Haeparang Energy Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation    
Location Korea    
Percentage of ownership 25.00%    
Acquisition cost ₩ 2,241    
Book value ₩ 2,241 0  
Saemangeum Sebit Power Plant Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation    
Location Korea    
Percentage of ownership [6] 69.55%    
Acquisition cost [6] ₩ 6,000    
Book value 6,000 [6] 0  
Daehan Wind Power PSC      
Disclosure of associates [line items]      
Unrecognized equity interest (3,855) 3,855  
Accumulated unrecognized equity interest 0 3,855  
Nghi Son 2 Power LLC      
Disclosure of associates [line items]      
Unrecognized equity interest (114,340) 30,456  
Accumulated unrecognized equity interest 18,940 133,280  
Barakah One Company      
Disclosure of associates [line items]      
Unrecognized equity interest (26,502) (46,758)  
Accumulated unrecognized equity interest 42,836 69,338  
Incheon New Power Co., Ltd.      
Disclosure of associates [line items]      
Unrecognized equity interest (31) 194  
Accumulated unrecognized equity interest 163 194  
KAPES, Inc.      
Disclosure of associates [line items]      
Unrecognized equity interest 317 3,198  
Accumulated unrecognized equity interest 3,515 3,198  
Chester Solar IV SpA      
Disclosure of associates [line items]      
Unrecognized equity interest 21 0  
Accumulated unrecognized equity interest ₩ 21 ₩ 0  
[1] The effective percentage of ownership is 22.02% considering treasury stocks.
[2] According to the shareholders’ agreement, additional investment of 50% of total stake is agreed by March 2022.
[3] The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint directors to the board of directors of the entity, and by strict decision criteria of the Company’s financial and operating policy of the board of directors.
[4] The effective percentage of ownership is more than 50% but the Company does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. Accordingly, the entity is classified as an associate.
[5] The effective percentage of ownership is more than 50% but the Company does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. Accordingly, the entity is classified as an associate.
[6] The effective percentage of ownership is more than 50% but the Company does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. Accordingly, the entity is classified as an associate.