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Investments in Associates 1 (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of associates [line items]      
Acquisition cost ₩ 3,089,683 ₩ 3,059,835  
Book value ₩ 5,844,464 ₩ 5,232,373 ₩ 4,250,787
Korea Gas Corporation      
Disclosure of associates [line items]      
Key operation activities Importing and wholesaling LNG Importing and wholesaling LNG [1]  
Location KOREA Korea [1]  
Percentage of ownership 20.47% 20.47% [1]  
Acquisition cost ₩ 94,500 ₩ 94,500 [1]  
The fair value of associates 684,180 738,990  
Book value ₩ 2,085,296 ₩ 1,815,513 [1] 1,647,325
Korea Electric Power Industrial Development Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Electricity metering and others Electricity metering and others  
Location KOREA Korea  
Percentage of ownership 29.00% 29.00%  
Acquisition cost ₩ 4,727 ₩ 4,727  
The fair value of associates 80,454 115,339  
Book value ₩ 31,078 ₩ 24,617 25,630
YTN Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Broadcasting [2] Broadcasting  
Location KOREA [2] Korea  
Percentage of ownership 21.43% [2] 21.43%  
Acquisition cost ₩ 59,000 [2] ₩ 59,000  
The fair value of associates 50,220 26,550  
Book value ₩ 55,027 [2] ₩ 51,828 40,549
Gangwon Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation [3] Power generation [4]  
Location KOREA [3] Korea [4]  
Percentage of ownership 15.00% [3] 15.00% [4]  
Acquisition cost ₩ 5,725 [3] ₩ 5,725 [4]  
Book value ₩ 12,158 [3] ₩ 10,554 [4] 11,443
Hyundai Green Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation equipment consignment and operation service Power generation equipment consignment and operation service  
Location KOREA Korea  
Percentage of ownership 29.00% 29.00%  
Acquisition cost ₩ 88,885 ₩ 88,885  
Book value ₩ 119,791 ₩ 121,955 132,774
Korea Power Exchange      
Disclosure of associates [line items]      
Key operation activities Management of power market and others [5] Management of power market and others [6]  
Location KOREA [5] Korea [6]  
Percentage of ownership 100.00% [5] 100.00% [6]  
Acquisition cost ₩ 127,839 [5] ₩ 127,839 [6]  
Book value 275,126 [5] 269,728 [6] 269,122
Dayone Energy Co., Ltd.      
Disclosure of associates [line items]      
Unrecognized equity interest 3,565 (1,244)  
Accumulated unrecognized equity interest ₩ 27,017 ₩ 23,452  
Taebaek Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation [7] Power generation  
Location KOREA [7] Korea  
Percentage of ownership 60.00% [7] 25.00%  
Acquisition cost ₩ 11,494 [7] ₩ 3,810  
Book value ₩ 14,501 [7] ₩ 6,800 6,392
Taebaek Guinemi Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation [7] Power generation  
Location KOREA [7] Korea  
Percentage of ownership 67.25% [7] 25.00%  
Acquisition cost ₩ 12,637 [7] ₩ 3,420  
Book value 13,049 [7] ₩ 3,357 3,087
Pyeongchang Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities   Power generation  
Location   Korea  
Percentage of ownership   25.00%  
Acquisition cost   ₩ 3,875  
Book value ₩ 0 ₩ 5,411 5,027
Daeryun Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation [3] Power generation [4]  
Location KOREA [3] Korea [4]  
Percentage of ownership 6.85% [3] 9.34% [4]  
Acquisition cost ₩ 40,854 [3] ₩ 40,854 [4]  
Book value 26,727 [3] ₩ 25,426 [4] 26,353
Changjuk Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities   Power generation  
Location   Korea  
Percentage of ownership   30.00%  
Acquisition cost   ₩ 3,801  
Book value ₩ 0 ₩ 8,355 7,867
KNH Solar Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 27.00% 27.00%  
Acquisition cost ₩ 1,296 ₩ 1,296  
Book value ₩ 2,883 ₩ 2,278 2,436
SPC Power Corporation      
Disclosure of associates [line items]      
Key operation activities Power generation [8] Power generation  
Location PHILIPPINES [8] Philippines  
Percentage of ownership 38.00% [8] 38.00%  
Acquisition cost ₩ 20,635 [8] ₩ 20,635  
The fair value of associates 134,814 203,589  
Book value ₩ 70,868 [8] ₩ 65,046 69,912
Gemeng International Energy Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location CHINA China  
Percentage of ownership 34.00% 34.00%  
Acquisition cost ₩ 413,153 ₩ 413,153  
Book value ₩ 578,821 ₩ 595,218 679,708
PT. Cirebon Electric Power      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location INDONESIA Indonesia  
Percentage of ownership 27.50% 27.50%  
Acquisition cost ₩ 40,365 ₩ 40,365  
Book value ₩ 135,114 ₩ 121,969 117,811
KNOC Nigerian East Oil Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Resources development [9] Resources development [10]  
Location NIGERIA [9] Nigeria [10]  
Percentage of ownership 14.63% [9] 14.63% [10]  
Acquisition cost ₩ 12 [9] ₩ 12 [10]  
Book value ₩ 0 [9] ₩ 0 [10] 0
KNOC Nigerian West Oil Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Resources development [9] Resources development [10]  
Location NIGERIA [9] Nigeria [10]  
Percentage of ownership 14.63% [9] 14.63% [10]  
Acquisition cost ₩ 12 [9] ₩ 12 [10]  
Book value ₩ 0 [9] ₩ 0 [10] 0
PT Wampu Electric Power      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location INDONESIA Indonesia  
Percentage of ownership 46.00% 46.00%  
Acquisition cost ₩ 21,292 ₩ 21,292  
Book value ₩ 37,743 ₩ 35,077 27,865
PT. Bayan Resources TBK      
Disclosure of associates [line items]      
Key operation activities Resources development Resources development  
Location INDONESIA Indonesia  
Percentage of ownership 20.00% 20.00%  
Acquisition cost ₩ 615,860 ₩ 615,860  
The fair value of associates 1,132,601 1,495,801  
Book value ₩ 684,719 ₩ 661,289 425,234
S-Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 49.00% 49.00%  
Acquisition cost ₩ 132,300 ₩ 132,300  
Book value ₩ 141,128 ₩ 122,786 110,292
Pioneer Gas Power Limited      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location INDIA India  
Percentage of ownership 38.50% 38.50%  
Acquisition cost ₩ 49,831 ₩ 49,831  
Book value 0 0 0
Unrecognized equity interest 19,248 21,691  
Accumulated unrecognized equity interest ₩ 56,877 ₩ 37,629  
Eurasia Energy Holdings      
Disclosure of associates [line items]      
Key operation activities Power generation and resources development Power generation and resources development  
Location RUSSIA Russia  
Percentage of ownership 40.00% 40.00%  
Acquisition cost ₩ 461 ₩ 461  
Book value 0 0 0
Unrecognized equity interest 13 15  
Accumulated unrecognized equity interest ₩ 203 ₩ 190  
Xe-Pian Xe-Namnoy Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location LAOS Laos  
Percentage of ownership 25.00% 25.00%  
Acquisition cost ₩ 87,426 ₩ 87,426  
Book value ₩ 115,584 ₩ 92,441 64,570
PT. Mutiara Jawa      
Disclosure of associates [line items]      
Key operation activities Manufacturing and operating floating coal terminal Manufacturing and operating floating coal terminal  
Location INDONESIA Indonesia  
Percentage of ownership 29.00% 29.00%  
Acquisition cost ₩ 2,978 ₩ 2,978  
Book value ₩ 3,597 ₩ 2,569 1,780
Samcheok Eco Materials Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities [11] Recycling fly ashes Recycling fly ashes  
Location [11] KOREA Korea  
Percentage of ownership [11] 2.35% 2.35%  
Acquisition cost [11] ₩ 686 ₩ 686  
Book value ₩ 0 [11] ₩ 0 [11] 0
Noeul Green Energy Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 29.00% 29.00%  
Acquisition cost ₩ 1,740 ₩ 1,740  
Book value 0 3,808 4,197
Unrecognized equity interest 5,470 0  
Accumulated unrecognized equity interest 5,470 0  
Naepo Green Energy Co., Ltd.      
Disclosure of associates [line items]      
Unrecognized equity interest 7,209 5,469  
Accumulated unrecognized equity interest ₩ 14,956 ₩ 7,747  
Goseong Green Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 29.00% 29.00%  
Acquisition cost ₩ 262,740 ₩ 262,740  
Book value ₩ 288,893 ₩ 260,858 2,186
Gangneung Eco Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation [3] Power generation [4]  
Location KOREA [3] Korea [4]  
Percentage of ownership 1.61% [3] 1.61% [4]  
Acquisition cost ₩ 2,900 [3] ₩ 2,900 [4]  
Book value 0 [3] 2,288 [4] 2,368
Unrecognized equity interest 14 0  
Accumulated unrecognized equity interest ₩ 14 ₩ 0  
Shin Pyeongtaek Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 40.00% 40.00%  
Acquisition cost ₩ 72,000 ₩ 72,000  
Book value ₩ 133,823 ₩ 93,074 69,591
Haeng Bok Do Si Photovoltaic Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 28.00% 28.00%  
Acquisition cost ₩ 194 ₩ 194  
Book value ₩ 278 ₩ 223 210
Dongducheon Dream Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities [12] Power generation Power generation  
Location [12] KOREA Korea  
Percentage of ownership [12] 33.61% 33.61%  
Acquisition cost [12] ₩ 148,105 ₩ 148,105  
Book value ₩ 89,300 [12] ₩ 74,198 [12] 80,637
Jinbhuvish Power Generation Pvt. Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation [3] Power generation [4]  
Location INDIA [3] India [4]  
Percentage of ownership 5.16% [3] 5.16% [4]  
Acquisition cost ₩ 9,000 [3] ₩ 9,000 [4]  
Book value ₩ 0 [3] ₩ 0 [4] 0
Daejung Offshore Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 46.59% 46.59%  
Acquisition cost ₩ 5,190 ₩ 5,190  
Book value ₩ 1,555 ₩ 1,704 2,165
GS Donghae Electric Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 34.00% 34.00%  
Acquisition cost ₩ 204,000 ₩ 204,000  
Book value ₩ 260,145 ₩ 243,772 244,426
Daegu Photovoltaic Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 29.00% 29.00%  
Acquisition cost ₩ 1,230 ₩ 1,230  
Book value ₩ 2,849 ₩ 2,342 2,066
Busan Green Energy Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 29.00% 29.00%  
Acquisition cost ₩ 5,243 ₩ 5,243  
Book value ₩ 4,395 ₩ 5,032 8,778
Gunsan Bio Energy Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation [3] Power generation [4]  
Location KOREA [3] Korea [4]  
Percentage of ownership 18.87% [3] 18.87% [4]  
Acquisition cost ₩ 1,000 [3] ₩ 1,000 [4]  
Book value 0 [3] 0 [4] 0
Unrecognized equity interest 122 282  
Accumulated unrecognized equity interest 3,986 ₩ 3,864  
Korea Electric Vehicle Charging Service      
Disclosure of associates [line items]      
Key operation activities [4]   Electric vehicle charge service  
Location [4]   Korea  
Percentage of ownership [4]   17.50%  
Acquisition cost [4]   ₩ 2,800  
Book value ₩ 0 ₩ 1,250 [4] 576
Hansuwon KNP Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Electric material agency Electric material agency  
Location KOREA Korea  
Percentage of ownership 28.98% 28.98%  
Acquisition cost ₩ 537 ₩ 537  
Book value ₩ 280 ₩ 219  
Korea Electric Power Corporation Fund      
Disclosure of associates [line items]      
Key operation activities Developing electric enterprises [13] Developing electric enterprises [14]  
Location KOREA [13] Korea [14]  
Percentage of ownership 98.09% [13] 98.09% [14]  
Acquisition cost ₩ 23,113 [13] ₩ 48,410 [14]  
Book value ₩ 28,842 [13] ₩ 47,983 [14] 41,926
Energy Infra Asset Management Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Asset management [3] Asset management [4]  
Location KOREA [3] Korea [4]  
Percentage of ownership 9.90% [3] 9.90% [4]  
Acquisition cost ₩ 297 [3] ₩ 297 [4]  
Book value ₩ 1,184 [3] ₩ 1,066 [4] 938
Daegu clean Energy Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Renewable power generation Renewable power generation  
Location KOREA Korea  
Percentage of ownership 28.00% 28.00%  
Acquisition cost ₩ 140 ₩ 140  
Book value ₩ 12 ₩ 12 12
YaksuESS Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Installing ESS related equipment Installing ESS related equipment  
Location KOREA Korea  
Percentage of ownership 29.00% 29.00%  
Acquisition cost ₩ 210 ₩ 210  
Book value ₩ 486 ₩ 716 454
Nepal Water & Energy Development Company Private Limited      
Disclosure of associates [line items]      
Key operation activities Construction and operation of utility plant [15] Construction and operation of utility plant [16]  
Location NEPAL [15] Nepal [16]  
Percentage of ownership 69.06% [15] 69.06% [16]  
Acquisition cost ₩ 70,228 [15] ₩ 70,228 [16]  
Book value ₩ 69,940 [15] ₩ 66,333 [16] 42,677
Gwangyang Green Energy Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 20.00% 20.00%  
Acquisition cost ₩ 26,800 ₩ 26,800  
Book value ₩ 25,044 ₩ 25,466 926
PND Solar Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 29.00% 29.00%  
Acquisition cost ₩ 1,250 ₩ 1,250  
Book value ₩ 1,403 ₩ 1,229 1,149
Hyundai Eco Energy Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation [3] Power generation [4]  
Location KOREA [3] Korea [4]  
Percentage of ownership 19.00% [3] 19.00% [4]  
Acquisition cost ₩ 3,610 [3] ₩ 3,610 [4]  
Book value ₩ 7,631 [3] ₩ 5,572 [4] 4,250
YeongGwang Yaksu Wind Electric Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation [3] Power generation [4]  
Location KOREA [3] Korea [4]  
Percentage of ownership 9.63% [3] 9.63% [4]  
Acquisition cost ₩ 533 [3] ₩ 533 [4]  
Book value ₩ 156 [3] ₩ 233 [4] 312
Green Energy Electricity Generation Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 29.00% 29.00%  
Acquisition cost ₩ 1,189 ₩ 1,189  
Book value ₩ 1,571 ₩ 1,713 25
Korea Energy Solutions Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities R & D R & D  
Location KOREA Korea  
Percentage of ownership 20.00% 20.00%  
Acquisition cost ₩ 300 ₩ 300  
Book value ₩ 93 ₩ 123 197
ITR Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities R & D R & D  
Location KOREA Korea  
Percentage of ownership 20.00% 20.00%  
Acquisition cost ₩ 50 ₩ 50  
Book value 0 32 40
Unrecognized equity interest 5 0  
Accumulated unrecognized equity interest ₩ 5 ₩ 0  
Structure test network Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Technical testing and consulting Technical testing and consulting  
Location KOREA Korea  
Percentage of ownership 20.00% 20.00%  
Acquisition cost ₩ 25 ₩ 25  
Book value ₩ 366 ₩ 306 27
Namjeongsusang Solar Power Operation Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation [17] Power generation [18]  
Location KOREA [17] Korea [18]  
Percentage of ownership 15.00% [17] 15.00% [18]  
Acquisition cost ₩ 969 [17] ₩ 969 [18]  
Book value ₩ 373 [17] ₩ 361 [18] 103
Indeck Niles Development, LLC      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation [19]  
Location USA USA [19]  
Percentage of ownership 50.00% 56.25% [19]  
Acquisition cost ₩ 263,825 ₩ 268,113 [19]  
Book value ₩ 302,038 ₩ 246,273 [19] 20,627
Indeck Niles Asset Management, LLC      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location USA USA  
Percentage of ownership 33.33% 33.33%  
Acquisition cost ₩ 0 ₩ 0  
Book value ₩ 94 ₩ 111 101
Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1      
Disclosure of associates [line items]      
Key operation activities Holding company Holding company  
Location KOREA Korea  
Percentage of ownership 49.00% 49.00%  
Acquisition cost ₩ 6,910 ₩ 7,112  
Book value ₩ 6,932 ₩ 7,138 7,326
Suwon New Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 39.90% 39.90%  
Acquisition cost ₩ 798 ₩ 798  
Book value 919 ₩ 1,035 1,054
KPGE Inc.      
Disclosure of associates [line items]      
Key operation activities   Power generation materials business  
Location   Korea  
Percentage of ownership   29.00%  
Acquisition cost   ₩ 287  
Book value ₩ 0 ₩ 309 287
Gwangbaek Solar Power Investment Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 44.00% 44.00%  
Acquisition cost ₩ 4,757 ₩ 4,757  
Book value ₩ 5,133 ₩ 4,806 4,682
Go deok Clean Energy Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Fuel cell generation Fuel cell generation  
Location KOREA Korea  
Percentage of ownership 40.00% 40.00%  
Acquisition cost ₩ 5,560 ₩ 5,560  
Book value ₩ 4,420 ₩ 4,302  
SureDataLab Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities R & D R & D  
Location KOREA Korea  
Percentage of ownership 23.95% 23.95%  
Acquisition cost ₩ 126 ₩ 126  
Book value ₩ 177 ₩ 128 85
SEP Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities R & D R & D  
Location KOREA Korea  
Percentage of ownership 21.26% 21.26%  
Acquisition cost ₩ 27 ₩ 27  
Book value 0 7 14
Unrecognized equity interest 14 0  
Accumulated unrecognized equity interest ₩ 14 ₩ 0  
Hankook Electric Power Information Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities R & D [20] R & D  
Location KOREA [20] Korea  
Percentage of ownership 16.49% [20] 25.25%  
Acquisition cost ₩ 38 [20] ₩ 38  
Book value ₩ 220 [20] ₩ 161 139
Tronix Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities R & D [20] R & D  
Location KOREA [20] Korea  
Percentage of ownership 12.50% [20] 20.00%  
Acquisition cost ₩ 75 [20] ₩ 75  
Book value ₩ 66 [20] ₩ 109 119
O2&B Global Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities R & D R & D  
Location KOREA Korea  
Percentage of ownership 20.00% 20.00%  
Acquisition cost ₩ 25 ₩ 25  
Book value ₩ 36 ₩ 35 22
Muan Sunshine Solar Power Plant Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 20.00% 20.00%  
Acquisition cost ₩ 1,570 ₩ 1,570  
Book value ₩ 2,562 ₩ 1,268 1,096
Bigeum Resident Photovoltaic Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 29.90% 29.90%  
Acquisition cost ₩ 1 ₩ 1  
Book value 0 0 0
Unrecognized equity interest 162 182  
Accumulated unrecognized equity interest ₩ 460 ₩ 298  
Goesan Solar Park Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 29.00% 29.00%  
Acquisition cost ₩ 1,276 ₩ 1,276  
Book value ₩ 2,591 ₩ 1,927 1,684
Saemangeum Heemang Photovoltaic Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 35.00% 35.00%  
Acquisition cost ₩ 11,022 ₩ 11,022  
Book value ₩ 13,010 ₩ 10,238 11,022
Bitgoel Eco Energy Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 49.25% 29.00%  
Acquisition cost ₩ 7,880 ₩ 4,640  
Book value ₩ 8,951 ₩ 4,356 29
Jeju Gimnyeong Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 30.00% 30.00%  
Acquisition cost ₩ 714 ₩ 714  
Book value ₩ 872 ₩ 911 1,578
Seoroseoro Sunny Power Plant Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 42.58% 42.58%  
Acquisition cost ₩ 706 ₩ 706  
Book value ₩ 859 ₩ 721 230
Muan Solar Park Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 20.00% 20.00%  
Acquisition cost ₩ 4,400 ₩ 4,400  
Book value ₩ 7,838 ₩ 6,083 4,180
YuDang Solar Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 20.00% 20.00%  
Acquisition cost ₩ 360 ₩ 360  
Book value ₩ 586 ₩ 565 360
Anjwa Smart Farm & Solar City Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 20.00% 20.00%  
Acquisition cost ₩ 5,651 ₩ 5,651  
Book value ₩ 8,662 ₩ 6,784 5,510
Daewon Green Energy Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 25.36% 25.36%  
Acquisition cost ₩ 3,910 ₩ 3,910  
Book value 4,485 3,877 3,910
Samcheok Eco Materials Co., Ltd      
Disclosure of associates [line items]      
Unrecognized equity interest 344 (323)  
Accumulated unrecognized equity interest ₩ 806 ₩ 462  
G.GURU Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities R & D R & D  
Location KOREA Korea  
Percentage of ownership 24.65% 24.65%  
Acquisition cost ₩ 493 ₩ 493  
Book value ₩ 300 ₩ 403  
UD4M Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities R & D [21] R & D [4]  
Location KOREA [21] Korea [4]  
Percentage of ownership 12.50% [21] 12.50% [4]  
Acquisition cost ₩ 75 [21] ₩ 75 [4]  
Book value ₩ 161 [21] ₩ 144 [4]  
Dongbu Highway Solar Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 20.00% 20.00%  
Acquisition cost ₩ 190 ₩ 190  
Book value ₩ 352 ₩ 265  
Seobu Highway Solar Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 20.00% 20.00%  
Acquisition cost ₩ 195 ₩ 195  
Book value ₩ 316 ₩ 289  
Korea Energy Data Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities R & D R & D  
Location KOREA Korea  
Percentage of ownership 29.37% 29.37%  
Acquisition cost ₩ 60 ₩ 60  
Book value ₩ 62 ₩ 62 0
Gangneung Sacheon Fuel Cell Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation [14]  
Location KOREA Korea [14]  
Percentage of ownership 41.00% 65.00% [14]  
Acquisition cost ₩ 5,695 ₩ 1,950 [14]  
Book value ₩ 4,277 ₩ 1,878 [14]  
KOSTURE Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Coal recycling business [3] Coal recycling business [4]  
Location KOREA [3] Korea [4]  
Percentage of ownership 0.82% [3] 0.26% [4]  
Acquisition cost ₩ 1 [3] ₩ 0 [4]  
Book value 1 [3] ₩ 0 [4]  
Digital Innovation Growth Fund      
Disclosure of associates [line items]      
Key operation activities [14]   Holding company  
Location [14]   Korea  
Percentage of ownership [14]   76.92%  
Acquisition cost [14]   ₩ 10,000  
Book value ₩ 0 ₩ 9,890 [14] 0
Taebaek Gadeoksan Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation [22]  
Location KOREA Korea [22]  
Percentage of ownership 34.00% 39.65% [22]  
Acquisition cost ₩ 12,570 ₩ 12,570 [22]  
Book value ₩ 20,040 ₩ 16,495 [22] 0
Chuncheon Green Energy Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation [14]  
Location KOREA Korea [14]  
Percentage of ownership 45.00% 68.00% [14]  
Acquisition cost ₩ 9,540 ₩ 3,400 [14]  
Book value ₩ 9,155 ₩ 3,372 [14] 0
Yeomsubong Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation [23] Power generation  
Location KOREA [23] Korea  
Percentage of ownership 3.81% [23] 48.72%  
Acquisition cost ₩ 95 [23] ₩ 95  
Book value ₩ 62 [23] ₩ 95 0
Yeongyang Wind Power Corporation II      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 30.00% 30.00%  
Acquisition cost ₩ 7,965 ₩ 7,965  
Book value ₩ 7,461 ₩ 7,965 0
Haeparang Energy Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 25.00% 25.00%  
Acquisition cost ₩ 2,241 ₩ 2,241  
Book value ₩ 2,188 ₩ 2,241 0
Saemangeum Sebit Power Plant Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities Power generation [24] Power generation [14]  
Location KOREA [24] Korea [14]  
Percentage of ownership 63.33% [24] 69.55% [14]  
Acquisition cost ₩ 13,788 [24] ₩ 6,000 [14]  
Book value 23,199 [24] 6,000 [14] ₩ 0
Nghi Son 2 Power LLC      
Disclosure of associates [line items]      
Unrecognized equity interest (18,940) (114,340)  
Accumulated unrecognized equity interest 0 18,940  
Barakah One Company      
Disclosure of associates [line items]      
Unrecognized equity interest 51,137 (26,502)  
Accumulated unrecognized equity interest 93,973 42,836  
Incheon New Power Co., Ltd.      
Disclosure of associates [line items]      
Unrecognized equity interest (163) (31)  
Accumulated unrecognized equity interest 0 163  
KAPES, Inc.      
Disclosure of associates [line items]      
Unrecognized equity interest (355) 317  
Accumulated unrecognized equity interest 3,160 3,515  
Chester Solar IV SpA      
Disclosure of associates [line items]      
Unrecognized equity interest (21) 21  
Accumulated unrecognized equity interest ₩ 0 21  
Boulder Solar III, LLC      
Disclosure of associates [line items]      
Key operation activities Power generation    
Location USA    
Percentage of ownership 30.00%    
Acquisition cost ₩ 715    
Book value ₩ 744    
PlatformN. Co., Ltd.      
Disclosure of associates [line items]      
Key operation activities R & D    
Location KOREA    
Percentage of ownership 29.58%    
Acquisition cost ₩ 105    
Book value ₩ 84    
PT. Cirebon Energi Prasarana      
Disclosure of associates [line items]      
Key operation activities [17] Power generation    
Location [17] INDONESIA    
Percentage of ownership [17] 10.00%    
Acquisition cost [17] ₩ 26,710    
Book value ₩ 69,035 [17] 0  
Green Radiation Co., Ltd      
Disclosure of associates [line items]      
Key operation activities [20] R & D    
Location [20] KOREA    
Percentage of ownership [20] 10.00%    
Acquisition cost [20] ₩ 20    
Book value [20] ₩ 11    
Future Convergence Technology Laboratory. Co., Ltd      
Disclosure of associates [line items]      
Key operation activities R & D    
Location KOREA    
Percentage of ownership 20.12%    
Acquisition cost ₩ 76    
Book value ₩ 50    
SC E&G. Co,. Ltd      
Disclosure of associates [line items]      
Key operation activities R & D    
Location KOREA    
Percentage of ownership 20.00%    
Acquisition cost ₩ 90    
Book value ₩ 214 0  
Wang San Engineering. Co,. Ltd      
Disclosure of associates [line items]      
Key operation activities R & D    
Location KOREA    
Percentage of ownership 20.00%    
Acquisition cost ₩ 81    
Book value ₩ 166 0  
ACE      
Disclosure of associates [line items]      
Key operation activities R & D    
Location KOREA    
Percentage of ownership 20.00%    
Acquisition cost ₩ 20    
Book value ₩ 20 0  
Environment and Energy Co., Ltd      
Disclosure of associates [line items]      
Key operation activities [20] R & D    
Location [20] KOREA    
Percentage of ownership [20] 10.54%    
Acquisition cost [20] ₩ 11    
Book value ₩ 10 [20] 0  
Santiago Solar Power SpA      
Disclosure of associates [line items]      
Key operation activities Power generation    
Location CHILE    
Percentage of ownership 50.00%    
Acquisition cost ₩ 13,851    
Book value ₩ 13,373 0  
Yanggu Floating Photovoltaic Power Plant Inc      
Disclosure of associates [line items]      
Key operation activities Power generation    
Location KOREA    
Percentage of ownership 29.00%    
Acquisition cost ₩ 904    
Book value 903    
International Offshore Power Transmission Holding Company Limited [Member]      
Disclosure of associates [line items]      
Unrecognized equity interest 23,378 0  
Accumulated unrecognized equity interest ₩ 23,378 ₩ 0  
[1] Due to changes in equity, the nominal and effective percentage of ownership are 20.47%.
[2] The Company is planning to sell its investments in YTN Co., Ltd. based on the resolution of the Board of Directors on November 23, 2022, but investments in YTN Co., Ltd. are not classified as assets held-for-sale as the Company hasn’t started the active selling procedures as of December 31, 2022.
[3] The effective percentage of ownership is less than 20%. However, the Group can exercise significant influence by virtue of its contractual right to appoint directors to the board of directors of the entity, and by strict decision criteria of the Group’s financial and operating policy of the board of directors.
[4] The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint directors to the board of directors of the entity, and by strict decision criteria of the Company’s financial and operating policy of the board of directors.
[5] The effective percentage of ownership is 100%. However, the Government regulates the Group’s ability to make operating and financial decisions over the entity, as the Government requires maintaining arms-length transactions between KPX and the Group’s other subsidiaries. Accordingly, the entity is not classified as a consolidated subsidiary. The Group can exercise significant influence by virtue of right to nominate directors to the board of directors of the entity.
[6] The effective percentage of ownership is 100%. However, the Government regulates the Company’s ability to make operating and financial decisions over the entity, as the Government requires maintaining arms-length transactions between KPX and the Company’s other subsidiaries. Accordingly, the entity is not classified as a consolidated subsidiary. The Company can exercise significant influence by virtue of right to nominate directors to the board of directors of the entity.
[7] After addtional acquisition of the shares, the effective percentage of ownership is more than 50%. However, the Group does not hold control over relevant business while it exercises significant influence by participating in the board of directors by the shareholders’ agreement. Accordingly, the entity is classified as an associate.
[8] The Company is planning to sell its investment in SPC Power Corporation, KEPCO SPC Power Corporation, KV Holdings, Inc. and time or proceeds of sales are not specified as of December 31, 2022.
[9] The effective percentage of ownership is less than 20%. However, the Group can exercise significant influence by virtue of its contractual right to appoint one out of four members of the steering committee of the entity. Moreover, the Group has significant financial transactions, which can affect its significant influence on the entity.
[10] The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint one out of four members of the steering committee of the entity. Moreover, the Company has significant financial transactions, which can affect its significant influence on the entity.
[11] Although the nominal percentage of ownership is 2.35%, the effective percentage of ownership is 25.54%, considering redeemable convertible preferred stock as a liability component.
[12] The effective percentage of ownership is 34.01% considering the conversion of redeemable convertible preferred stock into ordinary stock.
[13] The effective percentage of ownership is more than 50% but the Group does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. Accordingly, the entity is classified as an associate.
[14] The effective percentage of ownership is more than 50% but the Company does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. Accordingly, the entity is classified as an associate.
[15] The effective percentage of ownership is more than 50% but the Group does not hold control over the entity according to the shareholders’ agreement. Accordingly, the entity is classified as an associate.
[16] The effective percentage of ownership is more than 50% but the Company does not hold control over the entity according to the shareholders’ agreement. Accordingly, the entity is classified as an associate.
[17] The effective percentage of ownership is less than 20%. However, the entity is classified as an associate because the Group excercises significant influence over the decisions related to finance and operation.
[18] The effective percentage of ownership is less than 20%. However, the Company considers the major decision-making body to be the general decision of the board of directors, and the general decision of the board of directors can be passed only by two directors of Namjeongsusang Solar Power Operation Co., Ltd. Accordingly, the entity is classified as an associate.
[19] According to the shareholders’ agreement, additional investment of 50% of total stake is agreed by March 2022.
[20] The effective percentage of ownership is less than 20%. However, the entity is classified as an associate because the Group excercises significant influence over the entity.
[21] The effective percentage of ownership is 14.29% due to the acquisition of treasury stocks. The effective percentage of ownership is less than 20%. However, the Group excercises significant influence over the decisions related to finance and operation by virtue of right to nominate directors to the board of directors of the entity.
[22] The percentage of ownership decreased due to the unequal capital increase. The entity was reclassified from a joint venture to an associate, due to the changes in voting rights.
[23] The effective percentage of ownership decreased due to the disproportionate paid-in capital increase, and the effective percentage of ownership is less than 20%. However, the Group excercises significant influence over all decisions related to finance and operation.
[24] The effective percentage of ownership decreased due to the disproportionate paid-in capital increase during the year ended December 31, 2022. The effective percentage of ownership is more than 50% but the Group does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. Accordingly, the entity is classified as an associate.