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Investments in Joint Ventures 4 (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of joint ventures [line items]      
Book value ₩ 3,147,584 ₩ 2,239,011 ₩ 1,919,746
KEPCO-Uhde Inc.      
Disclosure of joint ventures [line items]      
Net assets ₩ 33 ₩ 114  
Effective percentage of ownership 50.85% 50.85%  
Share in net assets ₩ 17 ₩ 58  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 17 [1] 58 [2] 100
Shuweihat Asia Power Investment B.V.      
Disclosure of joint ventures [line items]      
Net assets ₩ 135,617 ₩ 75,652  
Effective percentage of ownership 49.00% 49.00%  
Share in net assets ₩ 66,452 ₩ 37,069  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 66,452 37,069 13,264
Shuweihat Asia Operation & Maintenance Company      
Disclosure of joint ventures [line items]      
Net assets ₩ 2,966 ₩ 2,509  
Effective percentage of ownership 55.00% 55.00%  
Share in net assets ₩ 1,631 ₩ 1,380  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 1,631 [1] 1,380 [2] 1,057
Waterbury Lake Uranium L.P.      
Disclosure of joint ventures [line items]      
Net assets ₩ 66,589 ₩ 65,226  
Effective percentage of ownership 32.59% 33.10%  
Share in net assets ₩ 21,701 ₩ 21,590  
Investment differential 49 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 21,750 [3] 21,590 19,797
ASM-BG Investicii AD      
Disclosure of joint ventures [line items]      
Net assets ₩ 29,110 ₩ 37,384  
Effective percentage of ownership 50.00% 50.00%  
Share in net assets ₩ 14,555 ₩ 18,692  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 14,555 18,692 18,200
RES Technology AD      
Disclosure of joint ventures [line items]      
Net assets ₩ 30,266 ₩ 33,405  
Effective percentage of ownership 50.00% 50.00%  
Share in net assets ₩ 15,133 ₩ 16,703  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 15,133 16,703 15,930
KV Holdings, Inc.      
Disclosure of joint ventures [line items]      
Net assets ₩ 24,148 ₩ 6,317  
Effective percentage of ownership 40.00% 40.00%  
Share in net assets ₩ 9,659 ₩ 2,527  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 9,659 [4] 2,527 2,405
KEPCO SPC Power Corporation      
Disclosure of joint ventures [line items]      
Net assets ₩ 238,822 ₩ 264,600  
Effective percentage of ownership 75.20% 75.20%  
Share in net assets ₩ 179,594 ₩ 198,979  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 179,594 [1],[4] 198,979 [2] 201,663
Gansu Datang Yumen Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 15,059 ₩ 16,588  
Effective percentage of ownership 40.00% 40.00%  
Share in net assets ₩ 6,024 ₩ 6,635  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 6,024 6,635 6,530
Datang Chifeng Renewable Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 479,954 ₩ 511,467  
Effective percentage of ownership 40.00% 40.00%  
Share in net assets ₩ 191,982 ₩ 204,587  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 191,982 204,587 188,478
Datang KEPCO Chaoyang Renewable Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 110,995 ₩ 110,542  
Effective percentage of ownership 40.00% 40.00%  
Share in net assets ₩ 44,398 ₩ 44,217  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 44,398 44,217 42,530
Rabigh Electricity Company      
Disclosure of joint ventures [line items]      
Net assets ₩ 665,110 ₩ 500,132  
Effective percentage of ownership 40.00% 40.00%  
Share in net assets ₩ 266,044 ₩ 200,053  
Investment differential 0 0  
Intercompany transaction (50,632) (55,571)  
Others (805) (804)  
Book value 214,607 143,678 97,157
Rabigh Operation & Maintenance Company Limited      
Disclosure of joint ventures [line items]      
Net assets ₩ 12,782 ₩ 10,177  
Effective percentage of ownership 40.00% 40.00%  
Share in net assets ₩ 5,113 ₩ 4,071  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 5,113 4,071 3,813
Jamaica Public Service Company Limited      
Disclosure of joint ventures [line items]      
Net assets ₩ 795,250 ₩ 705,503  
Effective percentage of ownership 40.00% 40.00%  
Share in net assets ₩ 318,100 ₩ 282,201  
Investment differential 29,357 29,357  
Intercompany transaction 0 0  
Others (16,050) (16,909)  
Book value 331,407 294,649 266,221
KW Nuclear Components Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 38,368 ₩ 35,355  
Effective percentage of ownership 45.00% 45.00%  
Share in net assets ₩ 17,266 ₩ 15,910  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (176) (176)  
Book value 17,090 15,734 11,171
Busan Shinho Solar Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 26,877 ₩ 23,363  
Effective percentage of ownership 25.00% 25.00%  
Share in net assets ₩ 6,719 ₩ 5,841  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 6,719 5,841 5,378
Global Trade Of Power System Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 2,406 ₩ 2,058  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 698 ₩ 597  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 698 [5] 597 [5] 546
Expressway Solar-light Power Generation Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 9,508 ₩ 10,634  
Effective percentage of ownership 50.00% 29.00%  
Share in net assets ₩ 4,754 ₩ 3,084  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 4,754 [6] 3,084 [5] 2,896
Amman Asia Electric Power Company      
Disclosure of joint ventures [line items]      
Net assets ₩ 367,090 ₩ 297,799  
Effective percentage of ownership 60.00% 60.00%  
Share in net assets ₩ 220,254 ₩ 178,679  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 220,254 [1] 178,679 [2] 161,253
KAPES, Inc.      
Disclosure of joint ventures [line items]      
Net assets ₩ 37,875 ₩ 33,691  
Effective percentage of ownership 51.00% 51.00%  
Share in net assets ₩ 19,316 ₩ 17,182  
Investment differential 0 0  
Intercompany transaction (22,451) (20,697)  
Others 3,135 3,515  
Book value 0 [1] 0 [2] 0
Honam Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 16,506 ₩ 13,823  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 4,787 ₩ 4,009  
Investment differential 32 32  
Intercompany transaction 0 0  
Others 0 0  
Book value 4,819 4,041 3,887
Korea Power Engineering Service Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 19,114 ₩ 18,671  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 5,543 ₩ 5,415  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 5,543 5,415 5,362
Chun-cheon Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 107,990 ₩ 87,427  
Effective percentage of ownership 29.90% 29.90%  
Share in net assets ₩ 32,289 ₩ 26,141  
Investment differential 3 3  
Intercompany transaction 0 0  
Others (248) (248)  
Book value 32,044 25,896 27,518
Yeonggwangbaeksu Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 20,972 ₩ 18,149  
Effective percentage of ownership 15.00% 15.00%  
Share in net assets ₩ 3,146 ₩ 2,722  
Investment differential 5 6  
Intercompany transaction 0 0  
Others 0 0  
Book value 3,151 [5] 2,728 [5] 3,124
Nghi Son 2 Power LLC      
Disclosure of joint ventures [line items]      
Net assets ₩ 817,678 ₩ (37,879)  
Effective percentage of ownership 50.00% 50.00%  
Share in net assets ₩ 408,839 ₩ (18,940)  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 18,940  
Book value 408,839 0 0
Kelar S.A      
Disclosure of joint ventures [line items]      
Net assets ₩ 175,717 ₩ 129,173  
Effective percentage of ownership 65.00% 65.00%  
Share in net assets ₩ 114,216 ₩ 83,962  
Investment differential 2,921 2,733  
Intercompany transaction 0 0  
Others 0 0  
Book value 117,137 [1] 86,695 [2] 71,449
PT. Tanjung Power Indonesia      
Disclosure of joint ventures [line items]      
Net assets ₩ 265,448 ₩ 132,988  
Effective percentage of ownership 35.00% 35.00%  
Share in net assets ₩ 92,907 ₩ 46,546  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 92,907 46,546 33,063
Incheon New Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 1,878 ₩ 634  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 545 ₩ 184  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (347) (184)  
Book value 198 [7] 0 [8] 0
Seokmun Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 59,778 ₩ 47,732  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 17,336 ₩ 13,842  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 17,336 13,842 14,814
Daehan Wind Power PSC      
Disclosure of joint ventures [line items]      
Net assets ₩ 27,846 ₩ 10,308  
Effective percentage of ownership 50.00% 50.00%  
Share in net assets ₩ 13,923 ₩ 5,154  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 13,923 5,154 0
Barakah One Company      
Disclosure of joint ventures [line items]      
Net assets ₩ (835,613) ₩ (243,855)  
Effective percentage of ownership 18.00% 18.00%  
Share in net assets ₩ (150,410) ₩ (43,894)  
Investment differential 0 0  
Intercompany transaction 56,437 1,058  
Others 93,973 42,836  
Book value 0 [9] 0 [9] 0
Nawah Energy Company      
Disclosure of joint ventures [line items]      
Net assets ₩ 1,749 ₩ 1,632  
Effective percentage of ownership 18.00% 18.00%  
Share in net assets ₩ 315 ₩ 294  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 315 [9] 294 [9] 270
Momentum      
Disclosure of joint ventures [line items]      
Net assets ₩ 1,035 ₩ 1,104  
Effective percentage of ownership 33.33% 33.33%  
Share in net assets ₩ 345 ₩ 368  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 345 368 565
Daegu Green Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 91,550 ₩ 81,768  
Effective percentage of ownership 54.24% 54.24%  
Share in net assets ₩ 49,657 ₩ 44,351  
Investment differential 84 84  
Intercompany transaction 0 0  
Others (20,381) (20,381)  
Book value 29,360 [10] 24,054 [10] 23,045
Yeonggwang Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 43,958 ₩ 37,291  
Effective percentage of ownership 46.00% 46.00%  
Share in net assets ₩ 20,221 ₩ 17,154  
Investment differential 492 492  
Intercompany transaction 0 0  
Others 0 0  
Book value 20,713 17,646 17,256
Chester Solar IV SpA      
Disclosure of joint ventures [line items]      
Net assets ₩ 259 ₩ (178)  
Effective percentage of ownership 45.00% 45.00%  
Share in net assets ₩ 117 ₩ (80)  
Investment differential 64 60  
Intercompany transaction 0 0  
Others 0 20  
Book value 181 0 1,064
Chester Solar V SpA      
Disclosure of joint ventures [line items]      
Net assets ₩ 49 ₩ (222)  
Effective percentage of ownership 45.00% 45.00%  
Share in net assets ₩ 22 ₩ (100)  
Investment differential 134 125  
Intercompany transaction 0 0  
Others 0 0  
Book value 156 25 277
Diego de Almagro Solar SpA      
Disclosure of joint ventures [line items]      
Net assets ₩ 962 ₩ 583  
Effective percentage of ownership 45.00% 45.00%  
Share in net assets ₩ 433 ₩ 262  
Investment differential 107 100  
Intercompany transaction 0 0  
Others 0 0  
Book value 540 362 1,490
South Jamaica Power Company Limited      
Disclosure of joint ventures [line items]      
Net assets ₩ 232,199 ₩ 186,812  
Effective percentage of ownership 20.00% 20.00%  
Share in net assets ₩ 46,440 ₩ 37,362  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (3) (2)  
Book value 46,437 37,360 31,897
Daesan Green Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 54,908 ₩ 60,697  
Effective percentage of ownership 35.00% 35.00%  
Share in net assets ₩ 19,218 ₩ 21,244  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 19,218 21,244 22,552
RE Holiday Holdings LLC      
Disclosure of joint ventures [line items]      
Net assets ₩ 170,740 ₩ 146,334  
Effective percentage of ownership 50.00% 50.00%  
Share in net assets ₩ 85,370 ₩ 73,167  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 85,370 73,167 68,809
RE Pioneer Holdings LLC      
Disclosure of joint ventures [line items]      
Net assets ₩ 110,344 ₩ 94,029  
Effective percentage of ownership 50.00% 50.00%  
Share in net assets ₩ 55,172 ₩ 47,015  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 55,172 47,015 49,639
RE Barren Ridge 1 Holdings LLC      
Disclosure of joint ventures [line items]      
Net assets ₩ 126,068 ₩ 114,338  
Effective percentage of ownership 50.00% 50.00%  
Share in net assets ₩ 63,034 ₩ 57,169  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (59,684) (55,286)  
Book value 3,350 1,883 4,466
RE Astoria 2 LandCo LLC      
Disclosure of joint ventures [line items]      
Net assets ₩ 13,198 ₩ 11,996  
Effective percentage of ownership 50.00% 50.00%  
Share in net assets ₩ 6,599 ₩ 5,998  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 6,599 5,998 5,230
RE Barren Ridge LandCo LLC      
Disclosure of joint ventures [line items]      
Net assets ₩ 4,666 ₩ 4,239  
Effective percentage of ownership 50.00% 50.00%  
Share in net assets ₩ 2,333 ₩ 2,120  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 2,333 2,120 1,847
Laurel SpA      
Disclosure of joint ventures [line items]      
Net assets ₩ 774 ₩ 216  
Effective percentage of ownership 45.00% 45.00%  
Share in net assets ₩ 348 ₩ 97  
Investment differential 206 193  
Intercompany transaction 0 0  
Others 0 0  
Book value 554 290 1,092
KIAMCO KOWEPO Bannerton Hold Co Pty Ltd      
Disclosure of joint ventures [line items]      
Net assets ₩ 29,443 ₩ 29,236  
Effective percentage of ownership 12.37% 12.37%  
Share in net assets ₩ 3,642 ₩ 3,616  
Investment differential 9 9  
Intercompany transaction 0 0  
Others 0 0  
Book value 3,651 [5] 3,625 [5] 4,129
Chile Solar JV SpA      
Disclosure of joint ventures [line items]      
Net assets ₩ 19,637 ₩ 64,914  
Effective percentage of ownership 50.00% 50.00%  
Share in net assets ₩ 9,819 ₩ 32,457  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 9,819 32,457 34,883
Cheong-Song Noraesan Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 14,484 ₩ 13,941  
Effective percentage of ownership 29.01% 29.01%  
Share in net assets ₩ 4,202 ₩ 4,045  
Investment differential 61 61  
Intercompany transaction 0 0  
Others 0 0  
Book value 4,263 [3] 4,106 3,453
Chester Solar I SpA      
Disclosure of joint ventures [line items]      
Net assets ₩ 2,313 ₩ 1,922  
Effective percentage of ownership 45.00% 45.00%  
Share in net assets ₩ 1,041 ₩ 865  
Investment differential 273 255  
Intercompany transaction 0 0  
Others 0 0  
Book value 1,314 1,120 1,621
Solar Philippines Calatagan Corporation      
Disclosure of joint ventures [line items]      
Net assets ₩ 76,571 ₩ 70,565  
Effective percentage of ownership 38.00% 38.00%  
Share in net assets ₩ 29,097 ₩ 26,815  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 27,805 31,416  
Book value 56,902 58,231 49,017
Saemangeum Solar Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 29,073 ₩ 29,552  
Effective percentage of ownership 81.01% 81.01%  
Share in net assets ₩ 23,551 ₩ 23,939  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 23,551 [11] 23,939 [11] 24,292
Chungsongmeon BongSan wind power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 5,823 ₩ 6,987  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 1,689 ₩ 2,026  
Investment differential 1,781 1,782  
Intercompany transaction 0 0  
Others 0 0  
Book value 3,470 [5] 3,808 [5] 4,124
Jaeun Resident Wind Power Plant Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 7,709 ₩ 6,753  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 2,236 ₩ 1,958  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 2,236 [5] 1,958 2,195
DE Energia SpA      
Disclosure of joint ventures [line items]      
Net assets ₩ (14,131) ₩ (10,386)  
Effective percentage of ownership 49.00% 49.00%  
Share in net assets ₩ (6,924) ₩ (5,089)  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 16,460 14,010  
Book value 9,536 8,921 8,187
Dangjin Eco Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 77,993 ₩ 75,787  
Effective percentage of ownership 34.00% 34.00%  
Share in net assets ₩ 26,518 ₩ 25,768  
Investment differential 341 341  
Intercompany transaction 0 0  
Others 0 0  
Book value 26,859 26,109 25,523
Haemodum Solar Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 6,871 ₩ 6,288  
Effective percentage of ownership 49.00% 49.00%  
Share in net assets ₩ 3,367 ₩ 3,081  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 3,367 3,081 3,065
Yangyang Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 21,642 ₩ 22,295  
Effective percentage of ownership 50.00% 50.00%  
Share in net assets ₩ 10,821 ₩ 11,148  
Investment differential 43 43  
Intercompany transaction 0 0  
Others 0 0  
Book value 10,864 11,191 10,485
Horus Solar, S.A. De C.V.      
Disclosure of joint ventures [line items]      
Net assets ₩ 22,722 ₩ 15,136  
Effective percentage of ownership 14.95% 14.95%  
Share in net assets ₩ 3,396 ₩ 2,262  
Investment differential 3,580 3,580  
Intercompany transaction 0 0  
Others 0 0  
Book value 6,976 [12] 5,842 [13] 3,394
Recursos Solares PV De Mexico II, S.A. De C.V.      
Disclosure of joint ventures [line items]      
Net assets ₩ 18,253 ₩ 15,822  
Effective percentage of ownership 14.95% 14.95%  
Share in net assets ₩ 2,728 ₩ 2,365  
Investment differential 2,171 2,171  
Intercompany transaction 0 0  
Others 0 0  
Book value 4,899 [12] 4,536 [13] 3,660
Sunmex Renovables, S.A. De C.V.      
Disclosure of joint ventures [line items]      
Net assets ₩ 11,053 ₩ 10,738  
Effective percentage of ownership 14.95% 14.95%  
Share in net assets ₩ 1,652 ₩ 1,605  
Investment differential 5 5  
Intercompany transaction 0 0  
Others 0 0  
Book value 1,657 [12] 1,610 [13] 240
Stavro Holding II A.B.      
Disclosure of joint ventures [line items]      
Net assets ₩ 85,856 ₩ 88,133  
Effective percentage of ownership 20.00% 20.00%  
Share in net assets ₩ 17,171 ₩ 17,627  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 17,171 17,627 9,277
Solaseado Solar Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 38,230 ₩ 21,928  
Effective percentage of ownership 38.90% 38.90%  
Share in net assets ₩ 14,872 ₩ 8,530  
Investment differential 1,361 1,361  
Intercompany transaction 0 0  
Others 0 0  
Book value 16,233 9,891 9,915
Yeongam Solar Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 47,923 ₩ 31,919  
Effective percentage of ownership 19.00% 19.00%  
Share in net assets ₩ 9,105 ₩ 6,065  
Investment differential 774 773  
Intercompany transaction 0 0  
Others 0 0  
Book value 9,879 [5] 6,838 [5] 6,042
Samsu Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 16,869 ₩ 14,882  
Effective percentage of ownership 19.00% 19.00%  
Share in net assets ₩ 3,205 ₩ 2,828  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 3,205 [5] 2,828 [5] 2,607
Pulau Indah Power Plant Sdn. Bhd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 84,683 ₩ 65,823  
Effective percentage of ownership 25.00% 25.00%  
Share in net assets ₩ 21,171 ₩ 16,456  
Investment differential 5,643 5,643  
Intercompany transaction 0 0  
Others 0 0  
Book value 26,814 22,099 11,204
Sam-Yang Photovoltaic Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets   ₩ 10,190  
Effective percentage of ownership   49.00%  
Share in net assets   ₩ 4,993  
Investment differential   0  
Intercompany transaction   0  
Others   0  
Book value 0 4,993 5,535
NH-Amundi Global Infrastructure Investment Private Investment Trust 21      
Disclosure of joint ventures [line items]      
Net assets ₩ 71,777 ₩ 70,872  
Effective percentage of ownership 29.53% 29.53%  
Share in net assets ₩ 21,196 ₩ 20,929  
Investment differential 527 527  
Intercompany transaction 0 0  
Others 0 0  
Book value 21,723 [11] 21,456 22,242
Shin-han BNPP Private Investment Trust for East-West Sunlight Dream      
Disclosure of joint ventures [line items]      
Net assets ₩ 17,319 ₩ 18,098  
Effective percentage of ownership 90.00% 90.00%  
Share in net assets ₩ 15,587 ₩ 16,288  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 15,587 [1] 16,288 [2] 16,129
PT Barito Wahana Tenaga      
Disclosure of joint ventures [line items]      
Net assets ₩ 447,688 ₩ 266,545  
Effective percentage of ownership 30.61% 30.61%  
Share in net assets ₩ 137,047 ₩ 81,595  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 137,047 81,595 63,029
Cheongna Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 17,595 ₩ 18,485  
Effective percentage of ownership 50.10% 50.10%  
Share in net assets ₩ 8,815 ₩ 9,261  
Investment differential 3,137 3,137  
Intercompany transaction (1,194) (1,200)  
Others 0 0  
Book value 10,758 [11] 11,198 [11] 4,940
Naepo Green Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ (51,219) ₩ (26,530)  
Effective percentage of ownership 29.20% 29.20%  
Share in net assets ₩ (14,956) ₩ (7,747)  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 14,956 7,747  
Book value 0 0 0
Dayone Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ (59,627) ₩ (51,842)  
Effective percentage of ownership 46.30% 46.30%  
Share in net assets ₩ (27,607) ₩ (24,003)  
Investment differential 0 0  
Intercompany transaction (868) (882)  
Others 28,475 24,885  
Book value 0 [14] 0 [15] 0
OneEnergy Asia Limited      
Disclosure of joint ventures [line items]      
Net assets ₩ 366,764 ₩ 135,470  
Effective percentage of ownership 40.00% 40.00%  
Share in net assets ₩ 146,706 ₩ 54,188  
Investment differential 25,512 25,512  
Intercompany transaction 0 0  
Others 0 0  
Book value 172,218 79,700 56,654
KAS Investment I LLC      
Disclosure of joint ventures [line items]      
Net assets ₩ 61,046 ₩ 51,098  
Effective percentage of ownership 29.89% 29.89%  
Share in net assets ₩ 18,247 ₩ 15,273  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 18,247 [3] 15,273 23,437
KAS Investment II LLC      
Disclosure of joint ventures [line items]      
Net assets ₩ 60,800 ₩ 50,895  
Effective percentage of ownership 29.89% 29.89%  
Share in net assets ₩ 18,173 ₩ 15,213  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 18,173 [3] 15,213 23,343
Energyco Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 4,692 ₩ 2,435  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 1,361 ₩ 706  
Investment differential 829 829  
Intercompany transaction 0 0  
Others 0 0  
Book value 2,190 1,535  
CAES, LLC      
Disclosure of joint ventures [line items]      
Net assets ₩ 49,670 ₩ 43,089  
Effective percentage of ownership 36.00% 36.00%  
Share in net assets ₩ 17,881 ₩ 15,512  
Investment differential 2,924 2,923  
Intercompany transaction 0 0  
Others 0 0  
Book value 20,805 18,435 17,626
Hapcheon Floating Photovoltaic Power Plant Inc.      
Disclosure of joint ventures [line items]      
Net assets ₩ 17,207 ₩ 14,146  
Effective percentage of ownership 49.00% 49.00%  
Share in net assets ₩ 8,432 ₩ 6,932  
Investment differential 39 39  
Intercompany transaction 0 0  
Others 0 0  
Book value 8,471 [5] 6,971 [5] 1,890
Busan Industrial Solar Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 3,133 ₩ 1,148  
Effective percentage of ownership 28.02% 28.02%  
Share in net assets ₩ 878 ₩ 322  
Investment differential 290 290  
Intercompany transaction 0 0  
Others 0 0  
Book value 1,168 612 510
Bitsolar Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ (4,545) ₩ (5,033)  
Effective percentage of ownership 27.10% 27.10%  
Share in net assets ₩ (1,232) ₩ (1,364)  
Investment differential 352 352  
Intercompany transaction 0 0  
Others 1,232 1,364  
Book value 352 352 352
Pulau Indah O&M Sdn. Bhd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 0 ₩ 0  
Effective percentage of ownership 60.00% 60.00%  
Share in net assets ₩ 0 ₩ 0  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 0 0 0
Guadalupe Solar SpA      
Disclosure of joint ventures [line items]      
Net assets ₩ 1,358 ₩ 935  
Effective percentage of ownership 60.00% 60.00%  
Share in net assets ₩ 815 ₩ 561  
Investment differential 98 98  
Intercompany transaction 0 0  
Others 0 0  
Book value 913 [11] 659 [11] 0
Omisan Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 24,393 ₩ 24,922  
Effective percentage of ownership 42.00% 42.00%  
Share in net assets ₩ 10,245 ₩ 10,467  
Investment differential 166 166  
Intercompany transaction 0 0  
Others 0 0  
Book value 10,411 10,633 0
Foresight Iberian Solar Group Holding, S.L.      
Disclosure of joint ventures [line items]      
Net assets ₩ 12,184 ₩ 11,091  
Effective percentage of ownership 75.00% 75.00%  
Share in net assets ₩ 9,138 ₩ 8,318  
Investment differential 1,427 1,425  
Intercompany transaction 0 0  
Others 0 0  
Book value 10,565 9,743 0
Yeongwol Eco Wind Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 4,575 ₩ 4,718  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 1,327 ₩ 1,368  
Investment differential 1,828 1,828  
Intercompany transaction 0 0  
Others 0 0  
Book value 3,155 3,196 0
Gurae Resident Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 1,182 ₩ 1,198  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 343 ₩ 347  
Investment differential 48 48  
Intercompany transaction 0 0  
Others 0 0  
Book value 391 395 0
Cheongju Eco Park Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 35,500 ₩ 18,172  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 10,295 ₩ 5,270  
Investment differential 195 195  
Intercompany transaction 0 0  
Others 0 0  
Book value 10,490 5,465 0
Enel X Midland Photovoltaic, LLC      
Disclosure of joint ventures [line items]      
Net assets ₩ 9,279 ₩ 8,442  
Effective percentage of ownership 20.00% 20.00%  
Share in net assets ₩ 1,856 ₩ 1,688  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 1,856 1,688 0
Geumsungsan Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 10,128 ₩ 18,956  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 2,937 ₩ 5,497  
Investment differential 556 556  
Intercompany transaction 0 0  
Others 0 0  
Book value 3,493 6,053 0
KEPCO KPS Carabao Corp.      
Disclosure of joint ventures [line items]      
Net assets ₩ 443 ₩ 966  
Effective percentage of ownership 40.00% 40.00%  
Share in net assets ₩ 177 ₩ 386  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 177 [7] 386 0
Prime Swedish Holding AB      
Disclosure of joint ventures [line items]      
Net assets ₩ 77,828 ₩ 34,237  
Effective percentage of ownership 45.00% 45.00%  
Share in net assets ₩ 35,023 ₩ 15,407  
Investment differential 1,222 34  
Intercompany transaction 0 0  
Others 0 0  
Book value 36,245 15,441 0
Goheung New Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 23,289 ₩ 23,020  
Effective percentage of ownership 46.15% 46.15%  
Share in net assets ₩ 10,748 ₩ 10,624  
Investment differential 1,084 1,084  
Intercompany transaction 0 0  
Others 0 0  
Book value 11,832 11,708 0
Gunsan Land Solar Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 36,586 ₩ 25,658  
Effective percentage of ownership 75.29% 75.29%  
Share in net assets ₩ 27,544 ₩ 19,317  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 27,544 [11] 19,317 [11] 0
Capman Lynx SCA, SICAR      
Disclosure of joint ventures [line items]      
Net assets ₩ 9,908 ₩ 19,952  
Effective percentage of ownership 50.00% 50.00%  
Share in net assets ₩ 4,954 ₩ 9,976  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (4,954) 0  
Book value 0 9,976 0
International Offshore Power Transmission Holding Company Limited      
Disclosure of joint ventures [line items]      
Net assets ₩ (66,788) ₩ 5  
Effective percentage of ownership 35.00% 35.00%  
Share in net assets ₩ (23,376) ₩ 2  
Investment differential (2) (2)  
Intercompany transaction 0 0  
Others 23,378 0  
Book value 0 0 ₩ 0
Pyeongchang Wind Power Co., Ltd. [Member]      
Disclosure of joint ventures [line items]      
Net assets ₩ 24,938    
Effective percentage of ownership 58.00%    
Share in net assets ₩ 14,464    
Investment differential 0    
Intercompany transaction 0    
Others 0    
Book value 14,464 [16] 0  
Eumseong Eco Park [Member]      
Disclosure of joint ventures [line items]      
Net assets ₩ 17,173    
Effective percentage of ownership 29.00%    
Share in net assets ₩ 4,980    
Investment differential 577    
Intercompany transaction 0    
Others 0    
Book value 5,557 0  
Songsan Green Energy [Member]      
Disclosure of joint ventures [line items]      
Net assets ₩ 5,500    
Effective percentage of ownership 25.00%    
Share in net assets ₩ 1,375    
Investment differential 12    
Intercompany transaction 0    
Others 0    
Book value 1,387 [3] 0  
Changwon Nuri Energy [Member]      
Disclosure of joint ventures [line items]      
Net assets ₩ 1,490    
Effective percentage of ownership 33.33%    
Share in net assets ₩ 497    
Investment differential 0    
Intercompany transaction 0    
Others 0    
Book value 497 [3] 0  
Hasami Wind Farm Corporation [Member]      
Disclosure of joint ventures [line items]      
Net assets ₩ 3,100    
Effective percentage of ownership 29.00%    
Share in net assets ₩ 899    
Investment differential 690    
Intercompany transaction 0    
Others 0    
Book value 1,589 0  
PungBack Wind Farm Corporation [Member]      
Disclosure of joint ventures [line items]      
Net assets ₩ 15,290    
Effective percentage of ownership 37.00%    
Share in net assets ₩ 5,657    
Investment differential 1,086    
Intercompany transaction 0    
Others 0    
Book value 6,743 [17] 0  
Trumbull Asset Management, LLC [Member]      
Disclosure of joint ventures [line items]      
Net assets ₩ 316    
Effective percentage of ownership 78.00%    
Share in net assets ₩ 246    
Investment differential 0    
Intercompany transaction 0    
Others 0    
Book value 246 [18] 0  
SPower Chile SpA [Member]      
Disclosure of joint ventures [line items]      
Net assets ₩ (20)    
Effective percentage of ownership 50.00%    
Share in net assets ₩ (10)    
Investment differential 0    
Intercompany transaction 0    
Others 137    
Book value 127 0  
Seungmun Green Energy [Member]      
Disclosure of joint ventures [line items]      
Net assets ₩ 27,440    
Effective percentage of ownership 33.00%    
Share in net assets ₩ 9,054    
Investment differential 0    
Intercompany transaction 0    
Others 0    
Book value 9,054 0  
Seobusambo highway photovoltaics Co., Ltd. [Member]      
Disclosure of joint ventures [line items]      
Net assets ₩ 3,833    
Effective percentage of ownership 80.00%    
Share in net assets ₩ 3,066    
Investment differential 0    
Intercompany transaction 0    
Others 0    
Book value ₩ 3,066 [19] ₩ 0  
[1] The effective percentage of ownership is more than 50%. However, according to the shareholders’ agreement, all critical financial and operating decisions must be agreed to by all ownership parties and the Group can exercise same voting rights as other shareholders at the board of directors. Accordingly, the entities are classified as joint ventures.
[2] The effective percentage of ownership is more than 50%. However, according to the shareholders’ agreement, all critical financial and operating decisions must be agreed to by all ownership parties. Accordingly, the entities are classified as joint ventures.
[3] The effective percentage of ownership is less than 50%. However, the entity is classified as a joint venture, because all consent was required to make decisions on related activities.
[4] The Company is planning to sell its investment in SPC Power Corporation, KEPCO SPC Power Corporation, KV Holdings, Inc. and time or proceeds of sales are not specified as of December 31, 2022.
[5] According to the shareholders’ agreement, the parties have joint control over all decisions related to finance and operation. Accordingly, the entity is classified as joint ventures.
[6] The effective percentage of ownership increased due to the disproportionate capital reduction of financial investors during the year ended December 31, 2022.
[7] The joint arrangement which the Group has joint control is structured through a separate company. The parties have joint control over the joint arrangement are classified as joint ventures, judging that they have rights to the net assets of the arrangement.
[8] The joint arrangement which the Company has joint control is structured through a separate company. The parties have joint control over the joint arrangement are classified as joint ventures, judging that they have rights to the net assets of the arrangement.
[9] The effective percentage of ownership is less than 20%. However, decisions in relevant actitvities must be agreed by ownership parties. Accordingly, the entity is classified as joint ventures.
[10] Although the nominal percentage of ownership is 29%, the effective percentage of ownership is 54.24%, considering the interest of financial investors as a liability component.
[11] The effective percentage of ownership is more than 50%. However, decisions in relevant actitvities must be agreed by all ownership parties. Accordingly, the entity is classified as a joint venture.
[12] The effective percentage of ownership is less than 20%. However, according to the shareholders’ agreement, decisions related pricipal operation must be agreed by all ownership parties. Accordingly, the Group can exercise significant influence.
[13] The effective percentage of ownership is less than 20%. However, according to the shareholders’ agreement, decisions related pricipal operation must be agreed by all ownership parties. Accordingly, the Company can exercise significant influence.
[14] According to the Dayone Energy Co., Ltd. Investment Agreement signed in March 2011, the Group has a commitment to guarantee principal and certain returns on shares of Dayone Energy Co., Ltd. held by NH Power 2nd Co., Ltd. and the National Agricultural Cooperative Federation. Since NH Power 2nd Co., Ltd. and the National Agricultural Cooperative Federation have put option regarding their share of the entity, the Group was deemed to have acquired an additional 15.64% stake. As a result, the effective percentage of ownership is 46.3% in the current and prior period. In accordance with shareholders’ agreement signed during the current period, the Group has joint control with other investors in making important financial and operation decisions, so it has been reclassified from an associate to a joint venture.
[15] According to the Dayone Energy Co., Ltd. Investment Agreement signed in March 2011, the Company has a commitment to guarantee principal and certain returns on shares of Dayone Energy Co., Ltd. held by NH Power 2nd Co., Ltd. and the National Agricultural Cooperative Federation. Since NH Power 2nd Co., Ltd. and the National Agricultural Cooperative Federation have put option regarding their share of the entity, the Company was deemed to have acquired an additional 15.64% stake. As a result, the effective percentage of ownership is 46.3% in the current and prior period. In accordance with shareholders’ agreement signed during the current period, the Company has joint control with other investors in making important financial and operation decisions, so it has been reclassified from an associate to a joint venture.
[16] After addtional acquisition of the shares, the effective percentage of ownership is more than 50%. However, decisions in relevant actitvities must be agreed by all members of the board of directors. Accordingly, the entity is classified as a joint venture.
[17] The effective percentage of ownership is 37%, considering potential common stock.
[18] The effective percentage of ownership is more than 50%. However, decisions in relevant actitvities must be agreed by all members of the board of directors. Accordingly, the entity is classified as a joint venture.
[19] Due to the changes in the agreement, the Group lost its control over the entity. Accordingly, the entity is reclassified to a joint venture from a subsidiary. Although the effective percentage of ownership is more than 50%, decisions in relevant actitvities must be agreed by all members of the board of directors.