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Investments in Joint Ventures 4 (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of joint ventures [line items]      
Book value ₩ 3,485,699 ₩ 3,147,584 ₩ 2,239,011
KEPCO-Uhde Inc.      
Disclosure of joint ventures [line items]      
Net assets   ₩ 33  
Effective percentage of ownership [1]   50.85%  
Share in net assets   ₩ 17  
Investment differential   0  
Intercompany transaction   0  
Others   0  
Book value 0 17 [2] 58
Shuweihat Asia Power Investment B.V.      
Disclosure of joint ventures [line items]      
Net assets ₩ 142,660 ₩ 135,617  
Effective percentage of ownership [1] 49.00% 49.00%  
Share in net assets ₩ 69,902 ₩ 66,452  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 69,902 66,452 37,069
Shuweihat Asia Operation & Maintenance Company      
Disclosure of joint ventures [line items]      
Net assets ₩ 3,305 ₩ 2,966  
Effective percentage of ownership [1] 55.00% 55.00%  
Share in net assets ₩ 1,818 ₩ 1,631  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 1,818 1,631 [2] 1,380
Waterbury Lake Uranium L.P.      
Disclosure of joint ventures [line items]      
Net assets ₩ 73,770 ₩ 66,589  
Effective percentage of ownership [1] 30.65% 32.59%  
Share in net assets ₩ 22,612 ₩ 21,701  
Investment differential 0 49  
Intercompany transaction 0 0  
Others 0 0  
Book value 22,612 [3] 21,750 [3] 21,590
ASM-BG Investicii AD      
Disclosure of joint ventures [line items]      
Net assets ₩ 29,478 ₩ 29,110  
Effective percentage of ownership [1] 50.00% 50.00%  
Share in net assets ₩ 14,739 ₩ 14,555  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 14,739 14,555 18,692
RES Technology AD      
Disclosure of joint ventures [line items]      
Net assets ₩ 28,765 ₩ 30,266  
Effective percentage of ownership [1] 50.00% 50.00%  
Share in net assets ₩ 14,383 ₩ 15,133  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 14,383 15,133 16,703
KV Holdings, Inc.      
Disclosure of joint ventures [line items]      
Net assets ₩ 12,966 ₩ 24,148  
Effective percentage of ownership [1] 40.00% 40.00%  
Share in net assets ₩ 5,186 ₩ 9,659  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 5,186 9,659 [4] 2,527
KEPCO SPC Power Corporation      
Disclosure of joint ventures [line items]      
Net assets ₩ 261,362 ₩ 238,822  
Effective percentage of ownership [1] 75.20% 75.20%  
Share in net assets ₩ 196,544 ₩ 179,594  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 196,544 [2],[5] 179,594 [4] 198,979
Gansu Datang Yumen Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 15,788 ₩ 15,059  
Effective percentage of ownership [1] 40.00% 40.00%  
Share in net assets ₩ 6,315 ₩ 6,024  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 6,315 6,024 6,635
Datang Chifeng Renewable Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 466,847 ₩ 479,954  
Effective percentage of ownership [1] 40.00% 40.00%  
Share in net assets ₩ 186,739 ₩ 191,982  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 186,739 191,982 204,587
Datang KEPCO Chaoyang Renewable Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 108,017 ₩ 110,995  
Effective percentage of ownership [1] 40.00% 40.00%  
Share in net assets ₩ 43,207 ₩ 44,398  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 43,207 44,398 44,217
Rabigh Electricity Company      
Disclosure of joint ventures [line items]      
Net assets ₩ 701,614 ₩ 665,110  
Effective percentage of ownership [1] 40.00% 40.00%  
Share in net assets ₩ 280,646 ₩ 266,044  
Investment differential 0 0  
Intercompany transaction (45,692) (50,632)  
Others 97 (805)  
Book value 235,051 214,607 143,678
Rabigh Operation & Maintenance Company Limited      
Disclosure of joint ventures [line items]      
Net assets ₩ 12,411 ₩ 12,782  
Effective percentage of ownership [1] 40.00% 40.00%  
Share in net assets ₩ 4,964 ₩ 5,113  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 4,964 5,113 4,071
Jamaica Public Service Company Limited      
Disclosure of joint ventures [line items]      
Net assets ₩ 840,820 ₩ 795,250  
Effective percentage of ownership [1] 40.00% 40.00%  
Share in net assets ₩ 336,328 ₩ 318,100  
Investment differential 29,357 29,357  
Intercompany transaction 0 0  
Others (15,819) (16,050)  
Book value 349,866 331,407 294,649
KW Nuclear Components Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 41,903 ₩ 38,368  
Effective percentage of ownership [1] 45.00% 45.00%  
Share in net assets ₩ 18,856 ₩ 17,266  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (176) (176)  
Book value 18,680 17,090 15,734
Busan Shinho Solar Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 26,675 ₩ 26,877  
Effective percentage of ownership [1] 25.00% 25.00%  
Share in net assets ₩ 6,669 ₩ 6,719  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 6,669 6,719 5,841
Global Trade Of Power System Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 2,121 ₩ 2,406  
Effective percentage of ownership [1] 29.00% 29.00%  
Share in net assets ₩ 615 ₩ 698  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 615 698 [6] 597
Expressway Solar-light Power Generation Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 10,374 ₩ 9,508  
Effective percentage of ownership [1] 50.00% 50.00%  
Share in net assets ₩ 5,187 ₩ 4,754  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 5,187 4,754 [7] 3,084
Amman Asia Electric Power Company      
Disclosure of joint ventures [line items]      
Net assets ₩ 372,373 ₩ 367,090  
Effective percentage of ownership [1] 60.00% 60.00%  
Share in net assets ₩ 223,424 ₩ 220,254  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 223,424 220,254 [2] 178,679
KAPES, Inc.      
Disclosure of joint ventures [line items]      
Net assets ₩ 37,591 ₩ 37,875  
Effective percentage of ownership [1] 51.00% 51.00%  
Share in net assets ₩ 19,171 ₩ 19,316  
Investment differential 0 0  
Intercompany transaction (22,186) (22,451)  
Others 3,015 3,135  
Book value 0 0 [2] 0
Honam Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 16,245 ₩ 16,506  
Effective percentage of ownership [1] 29.00% 29.00%  
Share in net assets ₩ 4,711 ₩ 4,787  
Investment differential 32 32  
Intercompany transaction 0 0  
Others 0 0  
Book value 4,743 4,819 4,041
Korea Power Engineering Service Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 19,681 ₩ 19,114  
Effective percentage of ownership [1] 29.00% 29.00%  
Share in net assets ₩ 5,708 ₩ 5,543  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 5,708 5,543 5,415
Chun-cheon Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 118,152 ₩ 107,990  
Effective percentage of ownership [1] 29.90% 29.90%  
Share in net assets ₩ 35,327 ₩ 32,289  
Investment differential 3 3  
Intercompany transaction 0 0  
Others (247) (248)  
Book value 35,083 32,044 25,896
Yeonggwangbaeksu Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 22,918 ₩ 20,972  
Effective percentage of ownership [1] 15.00% 15.00%  
Share in net assets ₩ 3,437 ₩ 3,146  
Investment differential 6 5  
Intercompany transaction 0 0  
Others 0 0  
Book value 3,443 3,151 [6] 2,728
Nghi Son 2 Power LLC      
Disclosure of joint ventures [line items]      
Net assets ₩ 835,977 ₩ 817,678  
Effective percentage of ownership [1] 50.00% 50.00%  
Share in net assets ₩ 417,989 ₩ 408,839  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 417,989 408,839 0
Kelar S.A      
Disclosure of joint ventures [line items]      
Net assets ₩ 197,779 ₩ 175,717  
Effective percentage of ownership [1] 65.00% 65.00%  
Share in net assets ₩ 128,557 ₩ 114,216  
Investment differential 2,972 2,921  
Intercompany transaction 0 0  
Others 0 0  
Book value 131,529 117,137 [2] 86,695
PT. Tanjung Power Indonesia      
Disclosure of joint ventures [line items]      
Net assets ₩ 257,574 ₩ 265,448  
Effective percentage of ownership [1] 35.00% 35.00%  
Share in net assets ₩ 90,151 ₩ 92,907  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 90,151 92,907 46,546
Incheon New Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 1,027 ₩ 1,878  
Effective percentage of ownership [1] 29.00% 29.00%  
Share in net assets ₩ 298 ₩ 545  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 (347)  
Book value 298 198 [3] 0
Seokmun Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 57,211 ₩ 59,778  
Effective percentage of ownership [1] 29.00% 29.00%  
Share in net assets ₩ 16,591 ₩ 17,336  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 16,591 17,336 13,842
Daehan Wind Power PSC      
Disclosure of joint ventures [line items]      
Net assets ₩ 32,853 ₩ 27,846  
Effective percentage of ownership [1] 50.00% 50.00%  
Share in net assets ₩ 16,426 ₩ 13,923  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 16,426 13,923 5,154
Barakah One Company      
Disclosure of joint ventures [line items]      
Net assets ₩ (1,314,727) ₩ (835,613)  
Effective percentage of ownership [1] 18.00% 18.00%  
Share in net assets ₩ (236,651) ₩ (150,410)  
Investment differential 0 0  
Intercompany transaction 95,932 56,437  
Others 140,719 93,973  
Book value 0 [8] 0 [8] 0
Nawah Energy Company      
Disclosure of joint ventures [line items]      
Net assets ₩ 1,835 ₩ 1,749  
Effective percentage of ownership [1] 18.00% 18.00%  
Share in net assets ₩ 330 ₩ 315  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 330 [8] 315 [8] 294
Momentum      
Disclosure of joint ventures [line items]      
Net assets ₩ 628 ₩ 1,035  
Effective percentage of ownership [1] 33.33% 33.33%  
Share in net assets ₩ 209 ₩ 345  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 209 345 368
Daegu Green Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 86,150 ₩ 91,550  
Effective percentage of ownership [1] 54.24% 54.24%  
Share in net assets ₩ 46,728 ₩ 49,657  
Investment differential 84 84  
Intercompany transaction 0 0  
Others (20,382) (20,381)  
Book value 26,430 29,360 [9] 24,054
Yeonggwang Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 49,756 ₩ 43,958  
Effective percentage of ownership [1] 46.00% 46.00%  
Share in net assets ₩ 22,888 ₩ 20,221  
Investment differential 492 492  
Intercompany transaction 0 0  
Others 0 0  
Book value 23,380 20,713 17,646
Chester Solar IV SpA      
Disclosure of joint ventures [line items]      
Net assets ₩ 931 ₩ 259  
Effective percentage of ownership [1] 45.00% 45.00%  
Share in net assets ₩ 419 ₩ 117  
Investment differential 65 64  
Intercompany transaction 0 0  
Others 0 0  
Book value 484 181 0
Chester Solar V SpA      
Disclosure of joint ventures [line items]      
Net assets ₩ 122 ₩ 49  
Effective percentage of ownership [1] 45.00% 45.00%  
Share in net assets ₩ 55 ₩ 22  
Investment differential 136 134  
Intercompany transaction 0 0  
Others 0 0  
Book value 191 156 25
Diego de Almagro Solar SpA      
Disclosure of joint ventures [line items]      
Net assets ₩ 1,878 ₩ 962  
Effective percentage of ownership [1] 45.00% 45.00%  
Share in net assets ₩ 846 ₩ 433  
Investment differential 108 107  
Intercompany transaction 0 0  
Others 0 0  
Book value 954 540 362
South Jamaica Power Company Limited      
Disclosure of joint ventures [line items]      
Net assets ₩ 215,559 ₩ 232,199  
Effective percentage of ownership [1] 20.00% 20.00%  
Share in net assets ₩ 43,112 ₩ 46,440  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (3) (3)  
Book value 43,109 46,437 37,360
Daesan Green Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 63,402 ₩ 54,908  
Effective percentage of ownership [1] 35.00% 35.00%  
Share in net assets ₩ 22,191 ₩ 19,218  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 22,191 19,218 21,244
RE Holiday Holdings LLC      
Disclosure of joint ventures [line items]      
Net assets ₩ 168,184 ₩ 170,740  
Effective percentage of ownership [1] 50.00% 50.00%  
Share in net assets ₩ 84,092 ₩ 85,370  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 84,092 85,370 73,167
RE Pioneer Holdings LLC      
Disclosure of joint ventures [line items]      
Net assets ₩ 108,162 ₩ 110,344  
Effective percentage of ownership [1] 50.00% 50.00%  
Share in net assets ₩ 54,081 ₩ 55,172  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 54,081 55,172 47,015
RE Barren Ridge 1 Holdings LLC      
Disclosure of joint ventures [line items]      
Net assets ₩ 116,307 ₩ 126,068  
Effective percentage of ownership [1] 50.00% 50.00%  
Share in net assets ₩ 58,154 ₩ 63,034  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 (59,684)  
Book value 58,154 3,350 1,883
RE Astoria 2 LandCo LLC      
Disclosure of joint ventures [line items]      
Net assets ₩ 13,874 ₩ 13,198  
Effective percentage of ownership [1] 50.00% 50.00%  
Share in net assets ₩ 6,937 ₩ 6,599  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 6,937 6,599 5,998
RE Barren Ridge LandCo LLC      
Disclosure of joint ventures [line items]      
Net assets ₩ 4,883 ₩ 4,666  
Effective percentage of ownership [1] 50.00% 50.00%  
Share in net assets ₩ 2,441 ₩ 2,333  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 2,441 2,333 2,120
Laurel SpA      
Disclosure of joint ventures [line items]      
Net assets ₩ 897 ₩ 774  
Effective percentage of ownership [1] 45.00% 45.00%  
Share in net assets ₩ 403 ₩ 348  
Investment differential 210 206  
Intercompany transaction 0 0  
Others 0 0  
Book value 613 554 290
KIAMCO KOWEPO Bannerton Hold Co Pty Ltd      
Disclosure of joint ventures [line items]      
Net assets ₩ 29,997 ₩ 29,443  
Effective percentage of ownership [1] 12.37% 12.37%  
Share in net assets ₩ 3,710 ₩ 3,642  
Investment differential 9 9  
Intercompany transaction 0 0  
Others 0 0  
Book value 3,719 3,651 [6] 3,625
Chile Solar JV SpA      
Disclosure of joint ventures [line items]      
Net assets   ₩ 19,637  
Effective percentage of ownership [1]   50.00%  
Share in net assets   ₩ 9,819  
Investment differential   0  
Intercompany transaction   0  
Others   0  
Book value 0 9,819 32,457
Cheong-Song Noraesan Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 12,734 ₩ 14,484  
Effective percentage of ownership [1] 29.01% 29.01%  
Share in net assets ₩ 3,695 ₩ 4,202  
Investment differential 61 61  
Intercompany transaction 0 0  
Others 0 0  
Book value 3,756 [3] 4,263 [3] 4,106
Chester Solar I SpA      
Disclosure of joint ventures [line items]      
Net assets ₩ 2,134 ₩ 2,313  
Effective percentage of ownership [1] 45.00% 45.00%  
Share in net assets ₩ 960 ₩ 1,041  
Investment differential 278 273  
Intercompany transaction 0 0  
Others 0 0  
Book value 1,238 1,314 1,120
Solar Philippines Calatagan Corporation      
Disclosure of joint ventures [line items]      
Net assets ₩ 108,382 ₩ 76,571  
Effective percentage of ownership [1] 38.00% 38.00%  
Share in net assets ₩ 41,185 ₩ 29,097  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 16,945 27,805  
Book value 58,130 56,902 58,231
Saemangeum Solar Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 28,911 ₩ 29,073  
Effective percentage of ownership [1] 81.01% 81.01%  
Share in net assets ₩ 23,419 ₩ 23,551  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 23,419 23,551 [10] 23,939
Chungsongmeon BongSan wind power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 3,045 ₩ 5,823  
Effective percentage of ownership [1] 29.00% 29.00%  
Share in net assets ₩ 883 ₩ 1,689  
Investment differential 1,782 1,781  
Intercompany transaction 0 0  
Others 0 0  
Book value 2,665 3,470 [6] 3,808
Jaeun Resident Wind Power Plant Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 7,636 ₩ 7,709  
Effective percentage of ownership [1] 29.00% 29.00%  
Share in net assets ₩ 2,214 ₩ 2,236  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 2,214 [6] 2,236 [6] 1,958
DE Energia SpA      
Disclosure of joint ventures [line items]      
Net assets ₩ 6,601 ₩ (14,131)  
Effective percentage of ownership [1] 49.00% 49.00%  
Share in net assets ₩ 3,235 ₩ (6,924)  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 6,468 16,460  
Book value 9,703 9,536 8,921
Dangjin Eco Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 77,681 ₩ 77,993  
Effective percentage of ownership [1] 34.00% 34.00%  
Share in net assets ₩ 26,412 ₩ 26,518  
Investment differential 341 341  
Intercompany transaction 0 0  
Others 0 0  
Book value 26,753 26,859 26,109
Haemodum Solar Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 6,371 ₩ 6,871  
Effective percentage of ownership [1] 49.00% 49.00%  
Share in net assets ₩ 3,122 ₩ 3,367  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 3,122 3,367 3,081
Yangyang Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 20,784 ₩ 21,642  
Effective percentage of ownership [1] 50.00% 50.00%  
Share in net assets ₩ 10,392 ₩ 10,821  
Investment differential 43 43  
Intercompany transaction 0 0  
Others 0 0  
Book value 10,435 10,864 11,191
Horus Solar, S.A. De C.V.      
Disclosure of joint ventures [line items]      
Net assets ₩ 50,862 ₩ 22,722  
Effective percentage of ownership [1] 14.95% 14.95%  
Share in net assets ₩ 7,601 ₩ 3,396  
Investment differential 3,580 3,580  
Intercompany transaction 0 0  
Others 0 0  
Book value 11,181 [11] 6,976 [12] 5,842
Recursos Solares PV De Mexico II, S.A. De C.V.      
Disclosure of joint ventures [line items]      
Net assets ₩ 58,636 ₩ 18,253  
Effective percentage of ownership [1] 14.95% 14.95%  
Share in net assets ₩ 8,764 ₩ 2,728  
Investment differential 2,171 2,171  
Intercompany transaction 0 0  
Others 0 0  
Book value 10,935 [11] 4,899 [12] 4,536
Sunmex Renovables, S.A. De C.V.      
Disclosure of joint ventures [line items]      
Net assets ₩ 23,664 ₩ 11,053  
Effective percentage of ownership [1] 14.95% 14.95%  
Share in net assets ₩ 3,536 ₩ 1,652  
Investment differential 5 5  
Intercompany transaction 0 0  
Others 0 0  
Book value 3,541 [11] 1,657 [12] 1,610
Stavro Holding II A.B.      
Disclosure of joint ventures [line items]      
Net assets ₩ 91,314 ₩ 85,856  
Effective percentage of ownership [1] 20.00% 20.00%  
Share in net assets ₩ 18,263 ₩ 17,171  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 18,263 17,171 17,627
Solaseado Solar Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 42,651 ₩ 38,230  
Effective percentage of ownership [1] 38.90% 38.90%  
Share in net assets ₩ 16,592 ₩ 14,872  
Investment differential 1,361 1,361  
Intercompany transaction 0 0  
Others 0 0  
Book value 17,953 16,233 9,891
Yeongam Solar Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 46,650 ₩ 47,923  
Effective percentage of ownership [1] 19.00% 19.00%  
Share in net assets ₩ 8,864 ₩ 9,105  
Investment differential 773 774  
Intercompany transaction 0 0  
Others 0 0  
Book value 9,637 [6] 9,879 [6] 6,838
Samsu Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 15,903 ₩ 16,869  
Effective percentage of ownership [1] 19.00% 19.00%  
Share in net assets ₩ 3,022 ₩ 3,205  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 3,022 [6] 3,205 [6] 2,828
Pulau Indah Power Plant Sdn. Bhd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 79,841 ₩ 84,683  
Effective percentage of ownership [1] 25.00% 25.00%  
Share in net assets ₩ 19,960 ₩ 21,171  
Investment differential 5,643 5,643  
Intercompany transaction 0 0  
Others 0 0  
Book value 25,603 26,814 22,099
NH-Amundi Global Infrastructure Investment Private Investment Trust 21      
Disclosure of joint ventures [line items]      
Net assets ₩ 72,368 ₩ 71,777  
Effective percentage of ownership [1] 29.53% 29.53%  
Share in net assets ₩ 21,370 ₩ 21,196  
Investment differential 527 527  
Intercompany transaction 0 0  
Others 0 0  
Book value 21,897 21,723 21,456
Shin-han BNPP Private Investment Trust for East-West Sunlight Dream      
Disclosure of joint ventures [line items]      
Net assets ₩ 17,208 ₩ 17,319  
Effective percentage of ownership [1] 90.00% 90.00%  
Share in net assets ₩ 15,487 ₩ 15,587  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 15,487 15,587 [2] 16,288
PT Barito Wahana Tenaga      
Disclosure of joint ventures [line items]      
Net assets ₩ 512,846 ₩ 447,688  
Effective percentage of ownership [1] 30.61% 30.61%  
Share in net assets ₩ 156,994 ₩ 137,047  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 156,994 137,047 81,595
Cheongna Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 47,107 ₩ 17,595  
Effective percentage of ownership [1] 50.10% 50.10%  
Share in net assets ₩ 23,601 ₩ 8,815  
Investment differential 3,137 3,137  
Intercompany transaction (1,189) (1,194)  
Others 0 0  
Book value 25,549 10,758 [10] 11,198
Naepo Green Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 18,101 ₩ (51,219)  
Effective percentage of ownership [1] 29.20% 29.20%  
Share in net assets ₩ 5,285 ₩ (14,956)  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 14,956  
Book value 5,285 0 0
Boim Combined Heat and Power Generation Co., Ltd. (formerly, Dayone Energy Co., Ltd.)      
Disclosure of joint ventures [line items]      
Net assets ₩ (56,378) ₩ (59,627)  
Effective percentage of ownership [1] 46.30% 46.30%  
Share in net assets ₩ (26,103) ₩ (27,607)  
Investment differential 0 0  
Intercompany transaction (826) (868)  
Others 26,929 28,475  
Book value 0 [13] 0 [14] 0
OneEnergy Asia Limited      
Disclosure of joint ventures [line items]      
Net assets ₩ 661,133 ₩ 366,764  
Effective percentage of ownership [1] 40.00% 40.00%  
Share in net assets ₩ 264,454 ₩ 146,706  
Investment differential 25,512 25,512  
Intercompany transaction 0 0  
Others 0 0  
Book value 289,966 172,218 79,700
KAS Investment I LLC      
Disclosure of joint ventures [line items]      
Net assets ₩ 52,806 ₩ 61,046  
Effective percentage of ownership [1] 29.89% 29.89%  
Share in net assets ₩ 15,784 ₩ 18,247  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 15,784 [3] 18,247 [3] 15,273
KAS Investment II LLC      
Disclosure of joint ventures [line items]      
Net assets ₩ 52,554 ₩ 60,800  
Effective percentage of ownership [1] 29.89% 29.89%  
Share in net assets ₩ 15,709 ₩ 18,173  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 15,709 [3] 18,173 [3] 15,213
Energyco Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 4,520 ₩ 4,692  
Effective percentage of ownership [1] 29.00% 29.00%  
Share in net assets ₩ 1,311 ₩ 1,361  
Investment differential 829 829  
Intercompany transaction 0 0  
Others 0 0  
Book value 2,140 2,190 1,535
CAES, LLC      
Disclosure of joint ventures [line items]      
Net assets ₩ 48,490 ₩ 49,670  
Effective percentage of ownership [1] 36.00% 36.00%  
Share in net assets ₩ 17,457 ₩ 17,881  
Investment differential 2,923 2,924  
Intercompany transaction 0 0  
Others 0 0  
Book value 20,380 20,805 18,435
Hapcheon Floating Photovoltaic Power Plant Inc.      
Disclosure of joint ventures [line items]      
Net assets ₩ 21,037 ₩ 17,207  
Effective percentage of ownership [1] 49.00% 49.00%  
Share in net assets ₩ 10,309 ₩ 8,432  
Investment differential 39 39  
Intercompany transaction 0 0  
Others 0 0  
Book value 10,348 [6] 8,471 [6] 6,971
Busan Industrial Solar Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 2,740 ₩ 3,133  
Effective percentage of ownership [1] 28.02% 28.02%  
Share in net assets ₩ 768 ₩ 878  
Investment differential 290 290  
Intercompany transaction 0 0  
Others 0 0  
Book value 1,058 1,168 612
Bitsolar Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ (5,932) ₩ (4,545)  
Effective percentage of ownership [1] 27.10% 27.10%  
Share in net assets ₩ (1,607) ₩ (1,232)  
Investment differential 352 352  
Intercompany transaction 0 0  
Others 1,607 1,232  
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 [1] 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 ₩ 1,835 ₩ 1,358  
Effective percentage of ownership [1] 60.00% 60.00%  
Share in net assets ₩ 1,102 ₩ 815  
Investment differential 98 98  
Intercompany transaction 0 0  
Others 0 0  
Book value 1,200 [10] 913 [10] 659
Omisan Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 23,960 ₩ 24,393  
Effective percentage of ownership [1] 42.00% 42.00%  
Share in net assets ₩ 10,063 ₩ 10,245  
Investment differential 166 166  
Intercompany transaction 0 0  
Others 0 0  
Book value 10,229 10,411 10,633
Foresight Iberian Solar Group Holding, S.L.      
Disclosure of joint ventures [line items]      
Net assets ₩ 8,923 ₩ 12,184  
Effective percentage of ownership [1] 75.00% 75.00%  
Share in net assets ₩ 6,692 ₩ 9,138  
Investment differential 1,427 1,427  
Intercompany transaction 0 0  
Others 0 0  
Book value 8,119 10,565 9,743
Yeongwol Eco Wind Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 7,573 ₩ 4,575  
Effective percentage of ownership [1] 29.00% 29.00%  
Share in net assets ₩ 2,196 ₩ 1,327  
Investment differential 1,828 1,828  
Intercompany transaction 0 0  
Others 0 0  
Book value 4,024 3,155 3,196
Gurae Resident Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 1,797 ₩ 1,182  
Effective percentage of ownership [1] 29.00% 29.00%  
Share in net assets ₩ 521 ₩ 343  
Investment differential 48 48  
Intercompany transaction 0 0  
Others 0 0  
Book value 569 391 395
Cheongju Eco Park Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 30,609 ₩ 35,500  
Effective percentage of ownership [1] 29.00% 29.00%  
Share in net assets ₩ 8,877 ₩ 10,295  
Investment differential 195 195  
Intercompany transaction 0 0  
Others 0 0  
Book value 9,072 10,490 5,465
Enel X Midland Photovoltaic, LLC      
Disclosure of joint ventures [line items]      
Net assets ₩ 12,710 ₩ 9,279  
Effective percentage of ownership [1] 20.00% 20.00%  
Share in net assets ₩ 2,542 ₩ 1,856  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 2,542 1,856 1,688
Geumsungsan Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 17,101 ₩ 10,128  
Effective percentage of ownership [1] 29.00% 29.00%  
Share in net assets ₩ 4,959 ₩ 2,937  
Investment differential 556 556  
Intercompany transaction 0 0  
Others 0 0  
Book value 5,515 3,493 6,053
KEPCO KPS CARABAO Corp.      
Disclosure of joint ventures [line items]      
Net assets ₩ (93) ₩ 443  
Effective percentage of ownership [1] 40.00% 40.00%  
Share in net assets ₩ (37) ₩ 177  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 37 0  
Book value 0 177 [15] 386
Prime Swedish Holding AB      
Disclosure of joint ventures [line items]      
Net assets ₩ 83,481 ₩ 77,828  
Effective percentage of ownership [1] 45.00% 45.00%  
Share in net assets ₩ 37,566 ₩ 35,023  
Investment differential 1,223 1,222  
Intercompany transaction 0 0  
Others 0 0  
Book value 38,789 36,245 15,441
Goheung New Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 31,749 ₩ 23,289  
Effective percentage of ownership [1] 46.15% 46.15%  
Share in net assets ₩ 14,652 ₩ 10,748  
Investment differential 1,084 1,084  
Intercompany transaction 0 0  
Others 0 0  
Book value 15,736 11,832 11,708
Gunsan Land Solar Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 35,587 ₩ 36,586  
Effective percentage of ownership [1] 56.91% 75.29%  
Share in net assets ₩ 20,251 ₩ 27,544  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 2,178 0  
Book value 22,429 [10],[16] 27,544 [10] 19,317
Capman Lynx SCA, SICAR      
Disclosure of joint ventures [line items]      
Net assets ₩ 6,832 ₩ 9,908  
Effective percentage of ownership [1] 50.00% 50.00%  
Share in net assets ₩ 3,416 ₩ 4,954  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (3,416) (4,954)  
Book value 0 0 9,976
International Offshore Power Transmission Holding Company Limited      
Disclosure of joint ventures [line items]      
Net assets ₩ 4,069 ₩ (66,788)  
Effective percentage of ownership [1] 35.00% 35.00%  
Share in net assets ₩ 1,425 ₩ (23,376)  
Investment differential (2) (2)  
Intercompany transaction 0 0  
Others 0 23,378  
Book value 1,423 0 0
Pyeongchang Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 21,083 ₩ 24,938  
Effective percentage of ownership [1] 58.00% 58.00%  
Share in net assets ₩ 12,228 ₩ 14,464  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 12,228 [17] 14,464 [18] 0
Eumseong Eco Park [Member]      
Disclosure of joint ventures [line items]      
Net assets   ₩ 17,173  
Effective percentage of ownership [1]   29.00%  
Share in net assets   ₩ 4,980  
Investment differential   577  
Intercompany transaction   0  
Others   0  
Book value 8,386 5,557 0
Songsan Green Energy [Member]      
Disclosure of joint ventures [line items]      
Net assets   ₩ 5,500  
Effective percentage of ownership [1]   25.00%  
Share in net assets   ₩ 1,375  
Investment differential   12  
Intercompany transaction   0  
Others   0  
Book value 0 1,387 [3] 0
Changwon Nuri Energy [Member]      
Disclosure of joint ventures [line items]      
Net assets   ₩ 1,490  
Effective percentage of ownership [1]   33.33%  
Share in net assets   ₩ 497  
Investment differential   0  
Intercompany transaction   0  
Others   0  
Book value 8,027 [6] 497 [3] 0
Hasami Wind Farm Corporation [Member]      
Disclosure of joint ventures [line items]      
Net assets   ₩ 3,100  
Effective percentage of ownership [1]   29.00%  
Share in net assets   ₩ 899  
Investment differential   690  
Intercompany transaction   0  
Others   0  
Book value 0 1,589 0
PungBack Wind Farm Corporation [Member]      
Disclosure of joint ventures [line items]      
Net assets   ₩ 15,290  
Effective percentage of ownership [1]   37.00%  
Share in net assets   ₩ 5,657  
Investment differential   1,086  
Intercompany transaction   0  
Others   0  
Book value 7,940 6,743 [19] 0
Trumbull Asset Management, LLC [Member]      
Disclosure of joint ventures [line items]      
Net assets   ₩ 316  
Effective percentage of ownership [1]   78.00%  
Share in net assets   ₩ 246  
Investment differential   0  
Intercompany transaction   0  
Others   0  
Book value 936 [17] 246 [17] 0
SPower Chile SpA [Member]      
Disclosure of joint ventures [line items]      
Net assets   ₩ (20)  
Effective percentage of ownership [1]   50.00%  
Share in net assets   ₩ (10)  
Investment differential   0  
Intercompany transaction   0  
Others   137  
Book value 64 127 0
Seungmun Green Energy [Member]      
Disclosure of joint ventures [line items]      
Net assets   ₩ 27,440  
Effective percentage of ownership [1]   33.00%  
Share in net assets   ₩ 9,054  
Investment differential   0  
Intercompany transaction   0  
Others   0  
Book value 9,757 9,054 0
Seobusambo highway photovoltaics Co., Ltd. [Member]      
Disclosure of joint ventures [line items]      
Net assets   ₩ 3,833  
Effective percentage of ownership [1]   80.00%  
Share in net assets   ₩ 3,066  
Investment differential   0  
Intercompany transaction   0  
Others   0  
Book value 3,580 3,066 [20] ₩ 0
Yangyang Suri Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 33,130    
Effective percentage of ownership [1] 29.00%    
Share in net assets ₩ 9,608    
Investment differential 0    
Intercompany transaction 0    
Others 0    
Book value 9,608 [3] 0  
KEPCO for Power Company      
Disclosure of joint ventures [line items]      
Net assets ₩ 725    
Effective percentage of ownership [1] 60.00%    
Share in net assets ₩ 435    
Investment differential 0    
Intercompany transaction 0    
Others 0    
Book value 435 [21] 0  
Taebaek Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 23,221    
Effective percentage of ownership [1] 60.00%    
Share in net assets ₩ 13,932    
Investment differential 0    
Intercompany transaction 0    
Others 0    
Book value 13,932 0  
Jeonju Bio Green Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 4,916    
Effective percentage of ownership [1] 65.00%    
Share in net assets ₩ 3,195    
Investment differential 0    
Intercompany transaction 0    
Others 0    
Book value 3,195 [10] 0  
Kumyang Eco Park Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 12,436    
Effective percentage of ownership [1] 29.00%    
Share in net assets ₩ 3,607    
Investment differential 56    
Intercompany transaction 0    
Others 0    
Book value 3,663 0  
Jeongeup Green Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 5,781    
Effective percentage of ownership [1] 18.71%    
Share in net assets ₩ 1,082    
Investment differential 478    
Intercompany transaction 0    
Others 0    
Book value 1,560 [22] 0  
Hadong E-factory Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 1,145    
Effective percentage of ownership [1] 29.99%    
Share in net assets ₩ 343    
Investment differential 6    
Intercompany transaction 0    
Others 0    
Book value 349 [3] 0  
Namyangju Combined Heat and Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Net assets ₩ 7,000    
Effective percentage of ownership [1] 55.00%    
Share in net assets ₩ 3,850    
Investment differential 0    
Intercompany transaction 0    
Others 0    
Book value 3,850 [23] 0  
Wadi Noor Solar Power Company SAOC      
Disclosure of joint ventures [line items]      
Net assets ₩ 1,675    
Effective percentage of ownership [1] 50.00%    
Share in net assets ₩ 837    
Investment differential 9    
Intercompany transaction 0    
Others 0    
Book value 846 0  
Fairhaven Energy Storage LLC      
Disclosure of joint ventures [line items]      
Net assets ₩ 0    
Effective percentage of ownership [1] 35.00%    
Share in net assets ₩ 0    
Investment differential 0    
Intercompany transaction 0    
Others 0    
Book value ₩ 0 [24] ₩ 0  
[1] The percentage of ownership shown above is after considering the treasury stocks and others.
[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 and the Company can exercise same voting rights as other shareholders at the board of directors. 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, and KV Holdings, Inc. The timing of and proceeds from such sales transaction is not specified as of December 31, 2023.
[5] The Company is planning to sell its investment in SPC Power Corporation, KEPCO SPC Power Corporation, and KV Holdings, Inc. The timing of and proceeds from such sales transaction is not specified as of December 31, 2022.
[6] 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.
[7] The effective percentage of ownership increased due to the disproportionate capital reduction of financial investors during the year ended December 31, 2022.
[8] The effective percentage of ownership is less than 20%. However, decisions in relevant activities must be agreed by ownership parties. Accordingly, the entity is classified as joint ventures.
[9] 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.
[10] The effective percentage of ownership is more than 50%. However, decisions in relevant activities must be agreed by all ownership parties. Accordingly, the entity is classified as a joint venture.
[11] The percentage of effective ownership is more than 20%. However, according to the shareholders’ agreement, decisions related principal operation 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 principal operation must be agreed by all ownership parties. Accordingly, the Company can exercise significant influence.
[13] According to the REC’s Innovation Co., Ltd. (formerly, Wang San Engineering. Co,. Ltd.). Investment Agreement signed in March 2011, the Company has a commitment to guarantee principal and certain returns on shares of REC’s Innovation Co., Ltd. (formerly, Wang San Engineering. 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.
[14] According to the Boim Combined Heat and Power Generation Co., Ltd. (formerly, Dayone Energy Co., Ltd.) Investment Agreement signed in March 2011, the Company has a commitment to guarantee principal and certain returns on shares of Boim Combined Heat and Power Generation Co., Ltd. (formerly, 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.
[15] 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.
[16] The nominal percentage of ownership is 75.29% and the effective percentage of ownership is 56.91%, as the Company has an obligation to provide excessive dividend income to Gunsan City when a certain rate of return defined in the shareholders’ agreement is met.
[17] The effective percentage of ownership is more than 50%. However, decisions in relevant activities must be agreed by all members of the board of directors. Accordingly, the entity is classified as a joint venture.
[18] After additional acquisition of the shares, the effective percentage of ownership is more than 50%. However, decisions in relevant activities must be agreed by all members of the board of directors. Accordingly, the entity is classified as a joint venture.
[19] The effective percentage of ownership is 37%, considering potential common stock.
[20] Due to the changes in the agreement, the Company 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 activities must be agreed by all members of the board of directors.
[21] Although the Company’s effective percentage of ownership is more than 50%, the entity is reclassified as a joint venture since the entity’s material financial and operational decisions require unanimous agreement of members in the board of directors due to the shareholders’ agreement concluded during the year ended December 31, 2023.
[22] Although the Company’s effective percentage of ownership is less than 20%, the entity is reclassified as a joint venture considering the Company can exercise significant influence on the entity due to the Company’s contractual right to appoint a director to the entity’s board of directors and the minimum number of the entity’s board of directors members required to agree for making decision on material financial and operational policies in accordance with the joint shareholders’ agreement .
[23] Although the Company’s effective percentage of ownership is more than 50%, the entity is classified as a joint venture since the entity’s material financial and operational decisions require unanimous agreement of members in the board of directors.
[24] Although the investment has not yet been paid, commitment to pay 35% of investment in the future has been made.