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Investments in Joint Ventures 4 (Details) - KRW (₩) ₩ in Millions | 12 Months Ended |
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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.

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