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