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v3.25.1

Investments in Associates 4 (Details) - KRW (₩) ₩ in Millions | 12 Months Ended |
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of associates [line items] |  |  |  |  |  |
Effective percentage of ownership |  | 20.00% |  |  |  |
Book value |  | ₩ 6,704,754 |  | ₩ 6,176,889 |  | ₩ 5,844,464
Korea Gas Corporation |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 10,826,356 |  | ₩ 9,826,038 |  |
Effective percentage of ownership |  | 21.66% | [1] | 20.47% | [2] |
Share in net assets |  | ₩ 2,344,989 |  | ₩ 2,011,390 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | (55,685) |  | (40,747) |  |
Book value |  | 2,289,304 | [3] | 1,970,643 |  | 2,085,296
Korea Electric Power Industrial Development Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 104,056 |  | ₩ 101,723 |  |
Effective percentage of ownership |  | 29.00% | [1] | 29.00% | [2] |
Share in net assets |  | ₩ 30,177 |  | ₩ 29,500 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 30,177 |  | 29,500 |  | 31,078
YTN Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  |  |  | ₩ 244,080 |  |
Effective percentage of ownership | [2] |  |  | 21.43% |  |
Share in net assets |  |  |  | ₩ 52,303 |  |
Investment differential |  |  |  | 0 |  |
Intercompany transaction |  |  |  | 0 |  |
Others |  |  |  | 0 |  |
Book value |  | 0 |  | 52,303 | [4] | 55,027
Gangwon Wind Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 77,631 |  | ₩ 79,682 |  |
Effective percentage of ownership |  | 15.00% | [1] | 15.00% | [2] |
Share in net assets |  | ₩ 11,644 |  | ₩ 11,952 |  |
Investment differential |  | 49 |  | 49 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 11,693 | [5] | 12,001 | [5] | 12,158
Hyundai Green Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 403,558 |  | ₩ 407,491 |  |
Effective percentage of ownership |  | 29.00% | [1] | 29.00% | [2] |
Share in net assets |  | ₩ 117,033 |  | ₩ 118,173 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | (29,640) |  | 0 |  |
Book value |  | 87,393 |  | 118,173 |  | 119,791
Korea Power Exchange |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 273,962 |  | ₩ 274,286 |  |
Effective percentage of ownership |  | 100.00% | [1] | 100.00% | [2] |
Share in net assets |  | ₩ 273,962 |  | ₩ 274,286 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 273,962 | [6] | 274,286 | [6] | 275,126
Taebaek Guinemi Wind Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 16,086 |  | ₩ 16,043 |  |
Effective percentage of ownership |  | 67.25% | [1] | 67.25% | [2] |
Share in net assets |  | ₩ 10,818 |  | ₩ 10,788 |  |
Investment differential |  | 2,741 |  | 2,742 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 13,559 | [7] | 13,530 | [7] | 13,049
Daeryun Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 465,879 |  | ₩ 403,701 |  |
Effective percentage of ownership |  | 6.85% | [1] | 6.85% | [2] |
Share in net assets |  | ₩ 31,913 |  | ₩ 27,654 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | (820) |  | (820) |  |
Book value |  | 31,093 | [5] | 26,834 | [5] | 26,727
KNH Solar Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 8,017 |  | ₩ 11,828 |  |
Effective percentage of ownership |  | 27.00% | [1] | 27.00% | [2] |
Share in net assets |  | ₩ 2,165 |  | ₩ 3,194 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 2,165 |  | 3,194 |  | 2,883
SPC Power Corporation |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 283,089 |  | ₩ 258,764 |  |
Effective percentage of ownership |  | 38.00% | [1] | 38.00% | [2] |
Share in net assets |  | ₩ 107,574 |  | ₩ 98,330 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | (19,399) |  |
Book value |  | 107,574 | [8] | 78,931 | [9] | 70,868
Gemeng International Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 2,498,612 |  | ₩ 2,317,545 |  |
Effective percentage of ownership |  | 42.00% | [1] | 42.00% | [2] |
Share in net assets |  | ₩ 1,049,417 |  | ₩ 973,369 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | (321,079) |  | (267,557) |  |
Book value |  | 728,338 |  | 705,812 |  | 578,821
PT. Cirebon Electric Power |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 572,838 |  | ₩ 488,215 |  |
Effective percentage of ownership |  | 27.50% | [1] | 27.50% | [2] |
Share in net assets |  | ₩ 157,530 |  | ₩ 134,259 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 157,530 |  | 134,259 |  | 135,114
KNOC Nigerian East Oil Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ (96,926) |  | ₩ (84,988) |  |
Effective percentage of ownership |  | 14.63% | [1] | 14.63% | [2] |
Share in net assets |  | ₩ (14,180) |  | ₩ (12,434) |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 14,180 |  | 12,434 |  |
Book value |  | 0 | [10] | 0 | [10] | 0
KNOC Nigerian West Oil Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ (89,121) |  | ₩ (78,143) |  |
Effective percentage of ownership |  | 14.63% | [1] | 14.63% | [2] |
Share in net assets |  | ₩ (13,038) |  | ₩ (11,432) |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 13,038 |  | 11,432 |  |
Book value |  | 0 | [10] | 0 | [10] | 0
PT Wampu Electric Power |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 85,366 |  | ₩ 75,120 |  |
Effective percentage of ownership |  | 46.00% | [1] | 46.00% | [2] |
Share in net assets |  | ₩ 39,268 |  | ₩ 34,555 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 39,268 |  | 34,555 |  | 37,743
PT. Bayan Resources TBK |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 3,238,297 |  | ₩ 2,428,465 |  |
Effective percentage of ownership |  | 20.00% | [1] | 20.00% | [2] |
Share in net assets |  | ₩ 647,659 |  | ₩ 485,693 |  |
Investment differential |  | 146,097 |  | 209,894 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | (76,380) |  | (76,380) |  |
Book value |  | 717,376 |  | 619,207 |  | 684,719
S-Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 370,303 |  | ₩ 334,591 |  |
Effective percentage of ownership |  | 49.00% | [1] | 49.00% | [2] |
Share in net assets |  | ₩ 181,448 |  | ₩ 163,950 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | (1,076) |  | (1,185) |  |
Others |  | 0 |  | 0 |  |
Book value |  | 180,372 |  | 162,765 |  | 141,128
Pioneer Gas Power Limited |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  |  |  | ₩ (257,311) |  |
Effective percentage of ownership | [2] |  |  | 38.50% |  |
Share in net assets |  |  |  | ₩ (99,058) |  |
Investment differential |  |  |  | 22,278 |  |
Intercompany transaction |  |  |  | 0 |  |
Others |  |  |  | 76,780 |  |
Book value |  | 0 |  | 0 |  | 0
Xe-Pian Xe-Namnoy Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 435,809 |  | ₩ 469,397 |  |
Effective percentage of ownership |  | 25.00% | [1] | 25.00% | [2] |
Share in net assets |  | ₩ 108,953 |  | ₩ 117,349 |  |
Investment differential |  | 305 |  | 305 |  |
Intercompany transaction |  | (946) |  | (987) |  |
Others |  | (35,247) |  | (289) |  |
Book value |  | 73,065 |  | 116,378 |  | 115,584
PT. Mutiara Jawa |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 19,777 |  | ₩ 17,822 |  |
Effective percentage of ownership |  | 29.00% | [1] | 29.00% | [2] |
Share in net assets |  | ₩ 5,735 |  | ₩ 5,168 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 5,735 |  | 5,168 |  | 3,597
Samcheok Eco Materials Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  |  |  | ₩ (17,351) |  |
Effective percentage of ownership | [2] |  |  | 25.54% |  |
Share in net assets |  |  |  | ₩ (4,431) |  |
Investment differential |  |  |  | 0 |  |
Intercompany transaction |  |  |  | 0 |  |
Others |  |  |  | 4,431 |  |
Book value |  | 0 |  | 0 |  | 0
Noeul Green Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ (13,223) |  | ₩ (17,973) |  |
Effective percentage of ownership |  | 29.00% | [1] | 29.00% | [2] |
Share in net assets |  | ₩ (3,835) |  | ₩ (5,212) |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 3,835 |  | 5,212 |  |
Book value |  | 0 |  | 0 |  | 0
Goseong Green Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 1,004,588 |  | ₩ 1,001,702 |  |
Effective percentage of ownership |  | 29.00% | [1] | 29.00% | [2] |
Share in net assets |  | ₩ 291,331 |  | ₩ 290,494 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | (6,789) |  | (2,870) |  |
Others |  | 0 |  | 0 |  |
Book value |  | 284,542 |  | 287,624 |  | 288,893
Gangneung Eco Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 692,281 |  | ₩ 716,901 |  |
Effective percentage of ownership |  | 29.00% | [1] | 29.00% | [2] |
Share in net assets |  | ₩ 200,761 |  | ₩ 207,901 |  |
Investment differential |  | 46,872 |  | 48,531 |  |
Intercompany transaction |  | (5,819) |  | (1,503) |  |
Others |  | 0 |  | 0 |  |
Book value |  | 241,814 |  | 254,929 | [11] | 0
Shin Pyeongtaek Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 373,908 |  | ₩ 390,335 |  |
Effective percentage of ownership |  | 40.00% | [1] | 40.00% | [2] |
Share in net assets |  | ₩ 149,563 |  | ₩ 156,134 |  |
Investment differential |  | 3,559 |  | 3,559 |  |
Intercompany transaction |  | (14,064) |  | (14,667) |  |
Others |  | 1 |  | 0 |  |
Book value |  | 139,059 |  | 145,026 |  | 133,823
Haeng Bok Do Si Photovoltaic Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 1,281 |  | ₩ 1,045 |  |
Effective percentage of ownership |  | 28.00% | [1] | 28.00% | [2] |
Share in net assets |  | ₩ 359 |  | ₩ 293 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 1 |  | 1 |  |
Book value |  | 360 |  | 294 |  | 278
Dongducheon Dream Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 305,984 |  | ₩ 294,848 |  |
Effective percentage of ownership |  | 34.01% | [1] | 34.01% | [2] |
Share in net assets |  | ₩ 104,065 |  | ₩ 100,278 |  |
Investment differential |  | 1,757 |  | 1,757 |  |
Intercompany transaction |  | (1,889) |  | (2,249) |  |
Others |  | (12,582) |  | (12,583) |  |
Book value |  | 91,351 | [12] | 87,203 | [12] | 89,300
Jinbhuvish Power Generation Pvt. Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 53,880 |  | ₩ 48,583 |  |
Effective percentage of ownership |  | 5.16% | [1] | 5.16% | [2] |
Share in net assets |  | ₩ 2,780 |  | ₩ 2,526 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | (2,780) |  | (2,526) |  |
Book value |  | 0 | [5] | 0 | [5] | 0
Daejung Offshore Wind Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 3,199 |  | ₩ 3,183 |  |
Effective percentage of ownership |  | 46.59% | [1] | 46.59% | [2] |
Share in net assets |  | ₩ 1,490 |  | ₩ 1,483 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 1,490 |  | 1,483 |  | 1,555
GS Donghae Electric Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 821,859 |  | ₩ 762,013 |  |
Effective percentage of ownership |  | 34.00% | [1] | 34.00% | [2] |
Share in net assets |  | ₩ 279,432 |  | ₩ 259,085 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 279,432 |  | 259,085 |  | 260,145
Daegu Photovoltaic Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 8,742 |  | ₩ 9,669 |  |
Effective percentage of ownership |  | 29.00% | [1] | 29.00% | [2] |
Share in net assets |  | ₩ 2,535 |  | ₩ 2,804 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 2,535 |  | 2,804 |  | 2,849
Hansuwon KNP Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 2,880 |  | ₩ 2,164 |  |
Effective percentage of ownership |  | 28.98% | [1] | 28.98% | [2] |
Share in net assets |  | ₩ 835 |  | ₩ 627 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | (161) |  | (160) |  |
Book value |  | 674 |  | 467 |  | 280
Busan Green Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 8,049 |  | ₩ 11,239 |  |
Effective percentage of ownership |  | 29.00% | [1] | 29.00% | [2] |
Share in net assets |  | ₩ 2,334 |  | ₩ 3,259 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 2,334 |  | 3,259 |  | 4,395
Korea Electric Power Corporation Fund |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 13,609 |  | ₩ 23,873 |  |
Effective percentage of ownership |  | 98.09% | [1] | 98.09% | [2] |
Share in net assets |  | ₩ 13,349 |  | ₩ 23,417 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 4 |  | 4 |  |
Book value |  | 13,353 | [13] | 23,421 | [13] | 28,842
Energy Infra Asset Management Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 12,808 |  | ₩ 12,257 |  |
Effective percentage of ownership |  | 9.90% | [1] | 9.90% | [2] |
Share in net assets |  | ₩ 1,268 |  | ₩ 1,213 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 1,268 | [14] | 1,213 | [14] | 1,184
Daegu clean Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  |  |  | ₩ 44 |  |
Effective percentage of ownership | [2] |  |  | 28.00% |  |
Share in net assets |  |  |  | ₩ 12 |  |
Investment differential |  |  |  | 0 |  |
Intercompany transaction |  |  |  | 0 |  |
Others |  |  |  | (12) |  |
Book value |  | 0 |  | 0 |  | 12
Yaksu ESS Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 557 |  | ₩ 980 |  |
Effective percentage of ownership |  | 29.00% | [1] | 29.00% | [2] |
Share in net assets |  | ₩ 161 |  | ₩ 284 |  |
Investment differential |  | 1 |  | 1 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 162 |  | 285 |  |
Nepal Water & Energy Development Company Private Limited |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 246,930 |  | ₩ 159,265 |  |
Effective percentage of ownership |  | 68.88% | [1] | 68.88% | [2] |
Share in net assets |  | ₩ 170,083 |  | ₩ 109,701 |  |
Investment differential |  | 872 |  | 872 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 170,955 |  | 110,573 |  |
Gwangyang Green Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 120,998 |  | ₩ 123,103 |  |
Effective percentage of ownership |  | 20.00% | [1] | 20.00% | [2] |
Share in net assets |  | ₩ 24,199 |  | ₩ 24,620 |  |
Investment differential |  | 18 |  | 18 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 24,217 |  | 24,638 |  | 25,044
PND Solar Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 5,455 |  | ₩ 4,677 |  |
Effective percentage of ownership |  | 29.00% | [1] | 29.00% | [2] |
Share in net assets |  | ₩ 1,582 |  | ₩ 1,356 |  |
Investment differential |  | 154 |  | 154 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | (1) |  | 0 |  |
Book value |  | 1,735 |  | 1,510 |  | 1,403
Hyundai Eco Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 43,574 |  | ₩ 40,699 |  |
Effective percentage of ownership |  | 19.00% | [1] | 19.00% | [2] |
Share in net assets |  | ₩ 8,279 |  | ₩ 7,733 |  |
Investment differential |  | 214 |  | 214 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 8,493 | [5] | 7,947 | [5] | 7,631
YeongGwang Yaksu Wind Electric Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ (406) |  | ₩ 547 |  |
Effective percentage of ownership |  | 9.63% | [1] | 9.63% | [2] |
Share in net assets |  | ₩ (39) |  | ₩ 53 |  |
Investment differential |  | 300 |  | 300 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | (220) |  | (220) |  |
Book value |  | 41 | [5] | 133 | [5] | 156
Green Energy Electricity Generation Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ (4,050) |  | ₩ (2,658) |  |
Effective percentage of ownership |  | 29.00% | [1] | 29.00% | [2] |
Share in net assets |  | ₩ (1,175) |  | ₩ (771) |  |
Investment differential |  | 779 |  | 779 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 396 |  | 0 |  |
Book value |  | 0 |  | 8 |  | 1,571
Korea Energy Solutions Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 985 |  | ₩ 848 |  |
Effective percentage of ownership |  | 20.00% | [1] | 20.00% | [2] |
Share in net assets |  | ₩ 197 |  | ₩ 170 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 197 |  | 170 |  | 93
ITR Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ (178) |  | ₩ (10) |  |
Effective percentage of ownership |  | 8.70% | [1] | 10.00% | [2] |
Share in net assets |  | ₩ (15) |  | ₩ (1) |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 15 |  | 1 |  |
Book value |  | 0 | [15] | 0 | [15] | 0
STN Co., Ltd. (formerly, Structure test network Co., Ltd.) |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 1,771 |  | ₩ 1,691 |  |
Effective percentage of ownership |  | 20.00% | [1] | 20.00% | [2] |
Share in net assets |  | ₩ 354 |  | ₩ 338 |  |
Investment differential |  | 53 |  | 53 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 407 |  | 391 |  | 366
Indeck Niles Development, LLC |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 529,874 |  | ₩ 482,200 |  |
Effective percentage of ownership |  | 50.00% | [1] | 50.00% | [2] |
Share in net assets |  | ₩ 264,936 |  | ₩ 241,100 |  |
Investment differential |  | 101,361 |  | 90,074 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 4,673 |  | 4,227 |  |
Book value |  | 370,970 |  | 335,401 |  | 302,038
Indeck Niles Asset Management, LLC |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 179 |  | ₩ 278 |  |
Effective percentage of ownership |  | 33.33% | [1] | 33.33% | [2] |
Share in net assets |  | ₩ 60 |  | ₩ 93 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 60 |  | 93 |  | 94
Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 12,487 |  | ₩ 13,258 |  |
Effective percentage of ownership |  | 49.00% | [1] | 49.00% | [2] |
Share in net assets |  | ₩ 6,119 |  | ₩ 6,496 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 6,119 |  | 6,496 |  | 6,932
Suwon New Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 2,089 |  | ₩ 2,318 |  |
Effective percentage of ownership |  | 30.15% | [1] | 33.05% | [2] |
Share in net assets |  | ₩ 630 |  | ₩ 766 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 284 |  | 256 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 914 |  | 1,022 |  | 919
Gwangbaek Solar Power Investment Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 10,999 |  | ₩ 10,998 |  |
Effective percentage of ownership |  | 44.00% | [1] | 44.00% | [2] |
Share in net assets |  | ₩ 4,839 |  | ₩ 4,839 |  |
Investment differential |  | 316 |  | 316 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 5,155 |  | 5,155 |  | 5,133
Go deok Clean Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 13,253 |  | ₩ 11,807 |  |
Effective percentage of ownership |  | 40.00% | [1] | 40.00% | [2] |
Share in net assets |  | ₩ 5,301 |  | ₩ 4,723 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 5,301 |  | 4,723 |  | 4,420
SureDataLab Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 199 |  | ₩ 474 |  |
Effective percentage of ownership |  | 23.95% | [1] | 23.95% | [2] |
Share in net assets |  | ₩ 48 |  | ₩ 114 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 48 |  | 114 |  | 177
SEP Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ (73) |  | ₩ (72) |  |
Effective percentage of ownership |  | 21.26% | [1] | 21.26% | [2] |
Share in net assets |  | ₩ (15) |  | ₩ (15) |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 15 |  | 15 |  |
Book value |  | 0 |  | 0 |  | 0
Hankook Electric Power Information Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 1,390 |  | ₩ 1,296 |  |
Effective percentage of ownership |  | 16.16% | [1] | 16.49% | [2] |
Share in net assets |  | ₩ 225 |  | ₩ 214 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | (13) |  | 0 |  |
Book value |  | 212 | [16] | 214 | [16] | 220
Tronix Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 1,165 |  | ₩ 1,757 |  |
Effective percentage of ownership |  | 12.50% | [1] | 12.50% | [2] |
Share in net assets |  | ₩ 146 |  | ₩ 220 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 146 | [16] | 220 | [16] | 66
O2&B Global Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ (32) |  | ₩ 105 |  |
Effective percentage of ownership |  | 20.00% | [1] | 20.00% | [2] |
Share in net assets |  | ₩ (6) |  | ₩ 21 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 6 |  | 0 |  |
Book value |  | 0 |  | 21 |  | 36
Muan Sunshine Solar Power Plant Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 11,389 |  | ₩ 11,637 |  |
Effective percentage of ownership |  | 20.00% | [1] | 20.00% | [2] |
Share in net assets |  | ₩ 2,278 |  | ₩ 2,328 |  |
Investment differential |  | 494 |  | 494 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 2,772 |  | 2,822 |  | 2,562
Bigeum Resident Photovoltaic Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 28,951 |  | ₩ (5,723) |  |
Effective percentage of ownership |  | 27.31% | [1] | 29.90% | [2] |
Share in net assets |  | ₩ 7,908 |  | ₩ (1,711) |  |
Investment differential |  | 0 |  | 24 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 1,687 |  |
Book value |  | 7,908 | [17] | 0 |  | 0
Goesan Solar Park Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 10,805 |  | ₩ 9,921 |  |
Effective percentage of ownership |  | 29.00% | [1] | 29.00% | [2] |
Share in net assets |  | ₩ 3,133 |  | ₩ 2,877 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 3,133 |  | 2,877 |  | 2,591
Saemangeum Heemang Photovoltaic Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 43,993 |  | ₩ 39,089 |  |
Effective percentage of ownership |  | 35.00% | [1] | 35.00% | [2] |
Share in net assets |  | ₩ 15,398 |  | ₩ 13,681 |  |
Investment differential |  | 739 |  | 739 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 16,137 |  | 14,420 |  | 13,010
Bitgoel Eco Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 27,933 |  | ₩ 25,269 |  |
Effective percentage of ownership |  | 49.05% | [1] | 49.05% | [2] |
Share in net assets |  | ₩ 13,701 |  | ₩ 12,394 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 13,701 |  | 12,394 |  | 8,951
Jeju Gimnyeong Wind Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 832 |  | ₩ 819 |  |
Effective percentage of ownership |  | 30.00% | [1] | 30.00% | [2] |
Share in net assets |  | ₩ 250 |  | ₩ 246 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 250 |  | 246 |  | 872
Seoroseoro Sunny Power Plant Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 2,371 |  | ₩ 2,163 |  |
Effective percentage of ownership |  | 42.58% | [1] | 42.58% | [2] |
Share in net assets |  | ₩ 1,010 |  | ₩ 921 |  |
Investment differential |  | 20 |  | 20 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 1,030 |  | 941 |  | 859
Muan Solar park Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 29,708 |  | ₩ 32,526 |  |
Effective percentage of ownership |  | 20.00% | [1] | 20.00% | [2] |
Share in net assets |  | ₩ 5,942 |  | ₩ 6,505 |  |
Investment differential |  | 325 |  | 325 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 6,267 |  | 6,830 |  | 7,838
YuDang Solar Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 3,083 |  | ₩ 2,849 |  |
Effective percentage of ownership |  | 20.00% | [1] | 20.00% | [2] |
Share in net assets |  | ₩ 617 |  | ₩ 570 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 617 |  | 570 |  | 586
Anjwa Smart Farm & Solar City Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 37,405 |  | ₩ 34,245 |  |
Effective percentage of ownership |  | 20.00% | [1] | 20.00% | [2] |
Share in net assets |  | ₩ 7,482 |  | ₩ 6,849 |  |
Investment differential |  | 816 |  | 816 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 8,298 |  | 7,665 |  | 8,662
KPE Green Energy Co., Ltd. (formerly, Daewon Green Energy Co., Ltd.) |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 32,284 |  | ₩ 30,506 |  |
Effective percentage of ownership |  | 25.36% | [1] | 25.36% | [2] |
Share in net assets |  | ₩ 8,186 |  | ₩ 7,735 |  |
Investment differential |  | 44 |  | 44 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 8,230 |  | 7,779 |  | 4,485
G.GURU Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 140 |  | ₩ 676 |  |
Effective percentage of ownership |  | 24.65% | [1] | 24.65% | [2] |
Share in net assets |  | ₩ 34 |  | ₩ 167 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 34 |  | 167 |  | 300
UD4M Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 849 |  | ₩ 1,048 |  |
Effective percentage of ownership |  | 14.29% | [1] | 14.29% | [2] |
Share in net assets |  | ₩ 121 |  | ₩ 150 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 121 |  | 150 |  | 161
Dongbu Highway Solar Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 2,306 |  | ₩ 1,650 |  |
Effective percentage of ownership |  | 20.00% | [1] | 20.00% | [2] |
Share in net assets |  | ₩ 462 |  | ₩ 330 |  |
Investment differential |  | 50 |  | 50 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 512 |  | 380 |  |
Seobu Highway Solar Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 2,895 |  | ₩ 2,032 |  |
Effective percentage of ownership |  | 20.00% | [1] | 20.00% | [2] |
Share in net assets |  | ₩ 579 |  | ₩ 406 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 579 |  | 406 |  |
Korea Energy Data Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 78 |  | ₩ 122 |  |
Effective percentage of ownership |  | 29.37% | [1] | 29.37% | [2] |
Share in net assets |  | ₩ 23 |  | ₩ 36 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 23 |  | 36 |  | 62
Gangneung Sacheon Fuel Cell Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 22,485 |  | ₩ 18,982 |  |
Effective percentage of ownership |  | 41.00% | [1] | 41.00% | [2] |
Share in net assets |  | ₩ 9,219 |  | ₩ 7,783 |  |
Investment differential |  | 87 |  | 87 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 9,306 |  | 7,870 |  | 4,277
KOSTURE Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  |  |  | ₩ 174 |  |
Effective percentage of ownership | [2] |  |  | 4.42% |  |
Share in net assets |  |  |  | ₩ 8 |  |
Investment differential |  |  |  | 0 |  |
Intercompany transaction |  |  |  | 0 |  |
Others |  |  |  | 0 |  |
Book value |  | 0 |  | 8 | [5] | 1
Taebaek Gadeoksan Wind Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 67,376 |  | ₩ 57,135 |  |
Effective percentage of ownership |  | 34.00% | [1] | 34.00% | [2] |
Share in net assets |  | ₩ 22,909 |  | ₩ 19,426 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 22,909 |  | 19,426 |  | 20,040
Chuncheon Green Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 39,152 |  | ₩ 19,659 |  |
Effective percentage of ownership |  | 45.00% | [1] | 45.00% | [2] |
Share in net assets |  | ₩ 17,619 |  | ₩ 8,847 |  |
Investment differential |  | 53 |  | 53 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 17,672 |  | 8,900 |  | 9,155
Yeomsubong Wind Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 1,232 |  | ₩ 2,156 |  |
Effective percentage of ownership |  | 29.00% | [1] | 29.00% | [2] |
Share in net assets |  | ₩ 357 |  | ₩ 625 |  |
Investment differential |  | 246 |  | 246 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 603 | [18] | 871 | [18] | 62
Yeongyang Wind Power Corporation II |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 30,639 |  | ₩ 26,634 |  |
Effective percentage of ownership |  | 30.00% | [1] | 30.00% | [2] |
Share in net assets |  | ₩ 9,191 |  | ₩ 7,990 |  |
Investment differential |  | 2,110 |  | 2,110 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 11,301 |  | 10,100 |  | 7,461
Haeparang Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 7,719 |  | ₩ 8,339 |  |
Effective percentage of ownership |  | 25.00% | [1] | 25.00% | [2] |
Share in net assets |  | ₩ 1,930 |  | ₩ 2,084 |  |
Investment differential |  | 20 |  | 20 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 1,950 |  | 2,104 |  | 2,188
Saemangeum Sebit Power Plant Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 67,139 |  | ₩ 67,286 |  |
Effective percentage of ownership |  | 55.00% | [1] | 55.00% | [2] |
Share in net assets |  | ₩ 36,928 |  | ₩ 37,009 |  |
Investment differential |  | 182 |  | 182 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 37,110 | [13] | 37,191 | [19] | 23,199
Boulder Solar III, LLC |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  |  |  | ₩ 1,929 |  |
Effective percentage of ownership | [2] |  |  | 30.00% |  |
Share in net assets |  |  |  | ₩ 579 |  |
Investment differential |  |  |  | 175 |  |
Intercompany transaction |  |  |  | 0 |  |
Others |  |  |  | 0 |  |
Book value |  |  |  | 754 |  |
PlatformN. Co., Ltd |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ (61) |  | ₩ (210) |  |
Effective percentage of ownership |  | 29.58% | [1] | 29.58% | [2] |
Share in net assets |  | ₩ (18) |  | ₩ (62) |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 18 |  | 62 |  |
Book value |  | 0 |  | 0 |  | 84
PT. Cirebon Energi Prasarana |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 968,458 |  | ₩ 765,973 |  |
Effective percentage of ownership |  | 10.00% | [1] | 10.00% | [2] |
Share in net assets |  | ₩ 96,846 |  | ₩ 76,597 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 96,846 | [20] | 76,597 | [20] | 69,035
Green Radiation Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ (142) |  | ₩ 226 |  |
Effective percentage of ownership |  | 10.00% | [1] | 10.00% | [2] |
Share in net assets |  | ₩ (14) |  | ₩ 23 |  |
Investment differential |  | 3 |  | 3 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 11 |  | 0 |  |
Book value | [16] | 0 |  | 26 |  |
Future Convergence Technology Laboratory. Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 107 |  | ₩ 177 |  |
Effective percentage of ownership |  | 20.12% | [1] | 20.12% | [2] |
Share in net assets |  | ₩ 22 |  | ₩ 36 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 22 |  | 36 |  |
Eco motion Co., Ltd. (formerly, SC E&G. Co,. Ltd.) |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 1,146 |  | ₩ 1,335 |  |
Effective percentage of ownership |  | 20.00% | [1] | 20.00% | [2] |
Share in net assets |  | ₩ 229 |  | ₩ 267 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 229 |  | 267 |  | 214
REC's Innovation Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 1,403 |  | ₩ 720 |  |
Effective percentage of ownership |  | 11.04% | [1] | 16.67% | [2] |
Share in net assets |  | ₩ 155 |  | ₩ 120 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 155 | [14] | 120 | [14] | 166
ACE |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 51 |  | ₩ 37 |  |
Effective percentage of ownership |  | 20.00% | [1] | 20.00% | [2] |
Share in net assets |  | ₩ 10 |  | ₩ 7 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | (5) |  | (5) |  |
Others |  | 0 |  | 0 |  |
Book value |  | 5 |  | 2 |  | 20
Environment and Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 31 |  | ₩ 89 |  |
Effective percentage of ownership |  | 10.54% | [1] | 10.54% | [2] |
Share in net assets |  | ₩ 3 |  | ₩ 9 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 3 | [16] | 9 | [16] | 10
Santiago Solar Power SpA |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 13,924 |  | ₩ 23,538 |  |
Effective percentage of ownership |  | 50.00% | [1] | 50.00% | [2] |
Share in net assets |  | ₩ 6,961 |  | ₩ 11,769 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 6,961 |  | 11,769 |  | 13,373
Yanggu Floating Photovoltaic Power Plant Inc. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 2,918 |  | ₩ 2,622 |  |
Effective percentage of ownership |  | 29.00% | [1] | 29.00% | [2] |
Share in net assets |  | ₩ 846 |  | ₩ 760 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 846 |  | 760 |  | 903
Power Embedded |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 288 |  | ₩ 296 |  |
Effective percentage of ownership |  | 23.33% | [1] | 23.33% | [2] |
Share in net assets |  | ₩ 67 |  | ₩ 69 |  |
Investment differential |  | 1 |  | 1 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 68 |  | 70 |  | 0
Changwon SG Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 3,550 |  | ₩ 4,089 |  |
Effective percentage of ownership |  | 18.78% | [1] | 18.78% | [2] |
Share in net assets |  | ₩ 667 |  | ₩ 768 |  |
Investment differential |  | 15 |  | 15 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 682 | [16] | 783 | [16] | 0
Donpyung Technology. Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 1,532 |  | ₩ 1,396 |  |
Effective percentage of ownership |  | 20.00% | [1] | 20.00% | [2] |
Share in net assets |  | ₩ 306 |  | ₩ 279 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | (25) |  | (25) |  |
Others |  | 0 |  | 0 |  |
Book value |  | 281 |  | 254 |  | 0
HORANG ENERGY Inc. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 8,959 |  | ₩ 9,813 |  |
Effective percentage of ownership |  | 40.00% | [1] | 40.00% | [2] |
Share in net assets |  | ₩ 3,584 |  | ₩ 3,925 |  |
Investment differential |  | 224 |  | 224 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 3,808 |  | 4,149 |  | 0
Hoenggye Renewable Energy Co., Ltd |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ (736) |  | ₩ (1,028) |  |
Effective percentage of ownership |  | 36.12% | [1] | 36.10% | [2] |
Share in net assets |  | ₩ (266) |  | ₩ (370) |  |
Investment differential |  | 2,375 |  | 2,270 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 266 |  | 475 |  |
Book value |  | 2,375 |  | 2,375 |  | 0
Haman Green Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 8,029 |  | ₩ 8,516 |  |
Effective percentage of ownership |  | 35.00% | [1] | 35.00% | [2] |
Share in net assets |  | ₩ 2,810 |  | ₩ 2,981 |  |
Investment differential |  | 0 |  | 0 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 2,810 |  | 2,981 |  | 0
Songsan Green Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 13,062 |  | ₩ 13,754 |  |
Effective percentage of ownership |  | 60.00% | [1] | 60.00% | [2] |
Share in net assets |  | ₩ 7,837 |  | ₩ 8,252 |  |
Investment differential |  | 71 |  | 71 |  |
Intercompany transaction |  | 0 |  | 0 |  |
Others |  | 0 |  | 0 |  |
Book value |  | 7,908 | [21] | 8,323 | [22] | ₩ 0
SkyPic Inc. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 130 |  |  |  |
Effective percentage of ownership | [1] | 20.00% |  |  |  |
Share in net assets |  | ₩ 26 |  |  |  |
Investment differential |  | 0 |  |  |  |
Intercompany transaction |  | 0 |  |  |  |
Others |  | 0 |  |  |  |
Book value |  | 26 |  | 0 |  |
HyChangwon Fuel Cell. Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 22,901 |  |  |  |
Effective percentage of ownership | [1] | 40.00% |  |  |  |
Share in net assets |  | ₩ 9,161 |  |  |  |
Investment differential |  | 117 |  |  |  |
Intercompany transaction |  | 0 |  |  |  |
Others |  | 0 |  |  |  |
Book value |  | 9,278 |  | 0 |  |
Dreams Co.,Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 50 |  |  |  |
Effective percentage of ownership | [1] | 11.00% |  |  |  |
Share in net assets |  | ₩ 6 |  |  |  |
Investment differential |  | 5 |  |  |  |
Intercompany transaction |  | 0 |  |  |  |
Others |  | 0 |  |  |  |
Book value |  | 11 | [16] | 0 |  |
DEEPAI Co.,Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 364 |  |  |  |
Effective percentage of ownership | [1] | 1.32% |  |  |  |
Share in net assets |  | ₩ 5 |  |  |  |
Investment differential |  | 6 |  |  |  |
Intercompany transaction |  | 0 |  |  |  |
Others |  | 0 |  |  |  |
Book value |  | 11 | [16],[23] | 0 |  |
Amaala Sustainable Company for Energy LLC |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Net assets |  | ₩ 196 |  |  |  |
Effective percentage of ownership | [1] | 10.00% |  |  |  |
Share in net assets |  | ₩ 20 |  |  |  |
Investment differential |  | 0 |  |  |  |
Intercompany transaction |  | 0 |  |  |  |
Others |  | (2) |  |  |  |
Book value |  | ₩ 18 | [20] | ₩ 0 |  |
[1] | The percentage of ownership shown above is an effective percentage of ownership including the treasury stocks and others.
[2] | The percentage of ownership shown above is after considering the treasury stocks and others.
[3] | The effective percentage of ownership is 21.66%, considering hybrid bonds.
[4] | The Company is planning to sell its investments in YTN Co., Ltd. based on the resolution of the Board of Directors on November 23, 2022, but investments in YTN Co., Ltd. are not classified as assets held-for-sale as the Company hasn’t started the active selling procedures as of December 31, 2023.
[5] | The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint directors to the board of directors of the entity, and by strict decision criteria of the Company’s financial and operating policy of the board of directors.
[6] | The effective percentage of ownership is 100%. However, the Government regulates the Company’s ability to make operating and financial decisions over the entity, as the Government requires maintaining arms-length transactions between KPX and the Company’s other subsidiaries. Accordingly, the entity is not classified as a consolidated subsidiary. The Company can exercise significant influence by virtue of right to nominate directors to the board of directors of the entity.
[7] | The effective percentage of ownership is more than 50%. However, by the shareholders’ agreement, the Company does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision committee. Accordingly, the entity is classified as an associate.
[8] | The Company is planning to sell its investment in SPC Power Corporation, KEPCO SPC Power Corporation, and KV Holdings, Inc. and the timing of and proceeds from such sales transaction is not specified as of December 31, 2023.
[9] | 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.
[10] | The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint one out of four members of the steering committee of the entity. Moreover, the Company has significant financial transactions, which can affect its significant influence on the entity.
[11] | The effective percentage of ownership changed due to the disproportionate capital reduction of financial investors during the year ended December 31, 2023.
[12] | The effective percentage of ownership is 34.01% considering the conversion of redeemable convertible preferred stock into ordinary stock.
[13] | The effective percentage of ownership is more than 50% but the Company does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. Accordingly, the entity is classified as an associate.
[14] | Although the Company’s effective percentage of ownership is less than 20%, the Company can exercise significant influence on the entity through its contractual right to appoint one director to the entity’s board of directors.
[15] | Although the Company’s effective percentage of ownership is less than 20%, the entity has been classified as an associate as the Company has significant influence on the entity considering the fact that ordinary resolutions passed at the shareholders’ meeting require the majority decision and the Company has the right to elect the entity’s directors.
[16] | The effective percentage of ownership is less than 20%. However, the entity is classified as an associate because the Company exercises significant influence over the entity.
[17] | During the year ended December 31, 2024, the long-term loan to Bigeum Resident Photovoltaic Power Co., Ltd. was converted into equity.
[18] | The effective percentage of ownership increased due to the disproportionate paid-in capital increase.
[19] | The effective percentage of ownership decreased due to the disproportionate paid-in capital increase during the year ended December 31, 2023. The effective percentage of ownership is more than 50% but the Company does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. Accordingly, the entity is classified as an associate.
[20] | The effective percentage of ownership is less than 20%. However, the entity is classified as an associate because the Company exercises significant influence over the decisions related to finance and operation.
[21] | The effective percentage of ownership is more than 50% but the Company does not hold control over the entity according to the shareholders’ agreement. Accordingly, the entity is classified as an associate.
[22] | 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.
[23] | The effective ownership interest is 1.32%, considering convertible redeemable preferred shares.

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