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Related Parties - Summary of Transactions Between Related Parties (Details) $ in Thousands, ₩ in Millions | 12 Months Ended
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Dec. 31, 2024 KRW (₩) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 KRW (₩) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 KRW (₩) | Dec. 31, 2022 USD ($)
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Dividends income |  | ₩ 70,601 |  | ₩ 25,941 |  | ₩ 28,875 |
Korea Gas Corporation |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 149,095 |  | 140,630 |  | 155,309 |
Electricity purchase |  | 6,623,974 |  | 8,873,781 |  | 11,996,402 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 15,766 |  | 14,671 |  |  |
Trade payables |  | 482,008 |  | 480,974 |  |  |
Non-trade receivables and others |  | 404 |  | 12,513 |  |  |
Non-trade payables and others |  | 1,486 |  | 1,378 |  |  |
Goseong Green Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 612,327 |  | 842,270 |  | 1,062,108 |
Electricity purchase |  | 1,301,710 |  | 1,572,074 |  | 1,905,502 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 30,732 |  | 55,719 |  |  |
Trade payables |  | 162,719 |  | 120,270 |  |  |
Non-trade receivables and others |  | 1,438 |  | 15 |  |  |
Non-trade payables and others |  | 45,174 |  | 48,621 |  |  |
Dongducheon Dream Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 17,151 |  | 16,138 |  | 8,942 |
Electricity purchase |  | 1,360,837 |  | 1,744,247 |  | 2,244,332 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 6,350 |  | 2,573 |  |  |
Trade payables |  | 114,962 |  | 117,975 |  |  |
Non-trade receivables and others |  | 637 |  | 478 |  |  |
Non-trade payables and others |  | 29 |  |  |  |  |
Saemangeum Sebit Power Plant Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 1,693 |  | 2,313 |  | 1,418 |
Electricity purchase |  | 19,753 |  | 22,365 |  | 23,159 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 156 |  |  |  |  |
Trade payables |  | 1,499 |  |  |  |  |
Non-trade receivables and others |  | 47 |  | 341 |  |  |
Daejung Offshore Wind Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 87 |  | 84 |  | 46 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Non-trade receivables and others |  | 349 |  | 263 |  |  |
Daegu Photovoltaic Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 344 |  | 408 |  | 268 |
Electricity purchase |  | 3,815 |  | 4,247 |  | 4,744 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade payables |  | 108 |  | 105 |  |  |
Haeng Bok Do Si Photovoltaic Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 3 |  | 3 |  | 2 |
Electricity purchase |  | 427 |  | 408 |  | 563 |
Korea Electric Power Industrial Development Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Service |  | 11,180 |  | 11,115 |  | 10,369 |
Service |  | 317,114 |  | 305,105 |  | 251,468 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 123 |  | 176 |  |  |
Gangneung Eco Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Fuel sales |  | 494,428 |  | 943,063 |  | 459,404 |
Others |  | 1,134 |  | 6,996 |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 8,142 |  | 59,623 |  |  |
Non-trade payables and others |  | 105 |  | 94 |  |  |
Shin Pyeongtaek Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 55,610 |  | 91,830 |  | 27,486 |
Electricity purchase |  | 843,056 |  | 1,040,965 |  | 957,294 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 1,720 |  | 1,814 |  |  |
Trade payables |  | 77,222 |  | 86,801 |  |  |
Non-trade receivables and others |  | 5,812 |  | 4,933 |  |  |
Non-trade payables and others |  | 2,450 |  | 385 |  |  |
Noeul Green Energy Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 8,009 |  | 8,431 |  | 9,396 |
Electricity purchase |  | 20,833 |  | 10,466 |  | 14,176 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 5 |  | 6 |  |  |
Non-trade receivables and others |  | 27,043 |  | 18,356 |  |  |
Non-trade payables and others |  | 3,699 |  | 3,005 |  |  |
Samcheok Eco Materials Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales | [1] | 0 |  | 615 |  | 546 |
Electricity purchase | [1] | 0 |  | 8,130 |  | 12,019 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables | [1] |  |  | 33 |  |  |
YTN Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales | [2] | 0 |  | 2,908 |  | 2,180 |
Electricity purchase | [2] | 0 |  | 309 |  | 304 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables | [2] |  |  | 133 |  |  |
Busan Green Energy Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 11,794 |  | 10,733 |  | 5,055 |
Electricity purchase |  | 28,272 |  | 23,211 |  | 26,219 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 1 |  | 1 |  |  |
Non-trade receivables and others |  | 43,790 |  | 32,720 |  |  |
Non-trade payables and others |  | 4,799 |  | 3,642 |  |  |
Korea Electric Vehicle Charging Service |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales | [3] |  |  | 0 |  | 3,686 |
Energy Infra Asset Management Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 89 |  | 89 |  | 0 |
Service |  | 2,631 |  | 2,701 |  | 2,779 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Non-trade payables and others |  | 1 |  |  |  |  |
Yaksu ESS Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity purchase |  | 749 |  | 508 |  | 851 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade payables |  | 923 |  | 538 |  |  |
Gangwon Wind Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 1,736 |  | 2,464 |  | 1,549 |
Electricity purchase |  | 23,400 |  | 32,525 |  | 40,130 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 10 |  | 13 |  |  |
Trade payables |  | 4,023 |  | 3,206 |  |  |
Bigeum Resident Photovoltaic Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 919 |  | 888 |  | 660 |
Others |  | 285 |  | 0 |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 273 |  | 406 |  |  |
Non-trade receivables and others |  | 1,796 |  | 1,316 |  |  |
Yanggu Floating Photovoltaic Power Plant Inc. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 6 |  | 0 |  | 0 |
Electricity purchase |  | 562 |  | 0 |  | 0 |
Goesan Solar park Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity purchase |  | 6,143 |  | 6,530 |  | 7,642 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade payables |  | 0 |  | 56 |  |  |
Gwangyang Green Energy Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 1,479 |  | 1,492 |  | 1,848 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 1,040 |  | 1,069 |  |  |
Non-trade receivables and others |  | 1,016 |  | 716 |  |  |
Hyundai Green Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales and design service |  | 6,659 |  | 6,668 |  | 7,063 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 893 |  | 903 |  |  |
Korea Power Exchange |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Service |  | 78,346 |  | 52,262 |  | 16,596 |
Service |  | 90,549 |  | 82,572 |  | 93,817 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 2,434 |  | 1,583 |  |  |
Trade payables |  | 2,688 |  | 16,367 |  |  |
Non-trade receivables and others |  |  |  | 1 |  |  |
Non-trade payables and others |  | 1,571 |  | 2,520 |  |  |
Taebaek Wind Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Service | [4] | 0 |  | 0 |  | 861 |
Others | [4] | 41 |  | 2,864 |  | 0 |
Service | [4] | 6,327 |  | 7,476 |  | 0 |
Service and REC | [4] | 0 |  | 0 |  | 7,442 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  |  |  | 4 |  |  |
Trade payables |  | 691 |  | 603 |  |  |
Non-trade payables and others |  | 184 |  | 341 |  |  |
Taebaek Guinemi Wind Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 26 |  | 0 |  | 0 |
Electricity purchase |  | 5,155 |  | 5,529 |  | 6,793 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade payables |  | 840 |  | 572 |  |  |
Non-trade payables and others |  | 167 |  | 286 |  |  |
Pyeongchang Wind Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 0 |  | 0 |  | 1,323 |
Electricity purchase |  | 3,079 |  | 3,542 |  | 0 |
Design service and others |  | 0 |  | 0 |  | 3,884 |
Pyeongchang Wind Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 771 |  | 2,087 |  | 0 |
Daeryun Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 3,628 |  | 3,187 |  | 2,016 |
Electricity purchase |  | 282,968 |  | 353,371 |  | 428,534 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  |  |  | 326 |  |  |
Trade payables |  | 35,392 |  | 32,140 |  |  |
Changjuk Wind Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales | [5] | 0 |  | 0 |  | 1,350 |
Electricity purchase | [5] | 0 |  | 0 |  | 9,027 |
GS Donghae Electric Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 9,284 |  | 28,164 |  | 5,238 |
Electricity purchase |  | 519,119 |  | 1,047,584 |  | 1,035,263 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 22 |  | 159 |  |  |
Trade payables |  | 90,468 |  | 72,951 |  |  |
Non-trade receivables and others |  | 109 |  | 169 |  |  |
Non-trade payables and others |  |  |  | 125 |  |  |
KNH Solar Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 1,635 |  | 15 |  | 13 |
Electricity purchase |  | 2,671 |  | 3,535 |  | 4,348 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  |  |  | 1 |  |  |
Trade payables |  |  |  | 19 |  |  |
Non-trade payables and others |  |  |  | 1 |  |  |
S-Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Service |  | 2,359 |  | 4,965 |  | 4,588 |
Service |  | 693,948 |  | 973,646 |  | 1,091,741 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 264 |  | 213 |  |  |
Trade payables |  | 73,377 |  | 79,459 |  |  |
Non-trade receivables and others |  | 54 |  | 53 |  |  |
Non-trade payables and others |  | 19 |  |  |  |  |
Chuncheon Green Energy Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 11,010 |  | 82 |  | 2 |
Electricity purchase |  | 39,333 |  | 0 |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Non-trade receivables and others |  | 10,870 |  |  |  |  |
Non-trade payables and others |  | 8,881 |  |  |  |  |
Yeongyang Wind Power Corporation II |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Commission |  | 150 |  | 150 |  | 0 |
Commission |  | 17,898 |  | 1,457 |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade payables |  | 3,978 |  |  |  |  |
Non-trade receivables and others |  |  |  | 165 |  |  |
PND Solar Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 348 |  | 547 |  | 427 |
Electricity purchase |  | 5,231 |  | 5,301 |  | 6,173 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade payables |  | 418 |  | 296 |  |  |
Hyundai Eco Energy Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 833 |  | 1,236 |  | 277 |
Electricity purchase |  | 26,253 |  | 26,266 |  | 29,209 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 25 |  | 28 |  |  |
Trade payables |  | 647 |  | 408 |  |  |
YeongGwang Yaksu Wind Electric Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 237 |  | 96 |  | 66 |
Electricity purchase |  | 7,415 |  | 6,776 |  | 7,382 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 7 |  | 10 |  |  |
Trade payables |  | 1,034 |  | 828 |  |  |
Non-trade receivables and others |  | 2,858 |  | 2,294 |  |  |
Taebaek Gadeoksan Wind Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 2,464 |  | 3,998 |  | 1,952 |
Electricity purchase |  | 32,549 |  | 34,940 |  | 25,880 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade payables |  | 9,249 |  | 12,739 |  |  |
Non-trade receivables and others |  | 62 |  | 1,539 |  |  |
Non-trade payables and others |  | 1 |  | 7 |  |  |
Korea Energy Solutions Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 2 |  | 2 |  | 2 |
Electricity purchase |  | 132 |  | 128 |  | 102 |
ITR Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Service |  | 0 |  | 3 |  | 6 |
STN Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Service |  | 1 |  | 0 |  | 7 |
Others |  | 8 |  | 10 |  | 0 |
Green Energy Electricity Generation Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity purchase |  | 1,966 |  | 948 |  | 2,962 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade payables |  |  |  | 62 |  |  |
Non-trade payables and others |  |  |  | 45 |  |  |
Namjeongsusang Solar Power Operation Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales | [6] | 0 |  | 31 |  | 21 |
Electricity purchase | [6] | 0 |  | 0 |  | 9,491 |
Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Service |  | 360 |  | 405 |  | 394 |
Bitgoel Eco Energy Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 3,377 |  | 1,581 |  | 1,397 |
Service and others |  | 32,413 |  | 28,334 |  | 930 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade payables |  | 5,394 |  | 6,226 |  |  |
Non-trade receivables and others |  | 2 |  | 131 |  |  |
Non-trade payables and others |  | 1,458 |  |  |  |  |
Jeju Gimnyeong Wind Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 458 |  | 315 |  | 367 |
Electricity purchase |  | 10,161 |  | 8,635 |  | 12,364 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade payables |  | 2,152 |  | 1,467 |  |  |
Non-trade receivables and others |  | 143 |  | 112 |  |  |
Non-trade payables and others |  | 5 |  | 9 |  |  |
Seoroseoro Sunny Power Plant Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 2 |  | 2 |  | 1 |
REC and others |  | 991 |  | 874 |  | 1,138 |
Muan Solar park Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 1,797 |  | 3,083 |  | 950 |
REC and others |  | 17,825 |  | 16,554 |  | 17,052 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Non-trade receivables and others |  | 4 |  | 4 |  |  |
YuDang Solar Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 60 |  | 100 |  | 160 |
REC and others |  | 2,020 |  | 1,860 |  | 1,915 |
Anjwa Smart Farm & Solar City Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 971 |  | 2,479 |  | 1,068 |
Electricity purchase |  | 19,494 |  | 17,332 |  | 16,942 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Non-trade payables and others |  | 1,797 |  | 1,296 |  |  |
KPE Green Energy Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 226 |  | 163 |  | 185 |
Others |  | 41,197 |  | 62,212 |  | 42,651 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 1 |  | 1 |  |  |
Trade payables |  | 5,521 |  | 5,485 |  |  |
Non-trade receivables and others |  | 130 |  |  |  |  |
Saemangeum Heemang Photovoltaic Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 2,232 |  | 3,538 |  | 5,740 |
Electricity purchase |  | 2,745 |  | 440 |  | 1,039 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Non-trade receivables and others |  | 1 |  |  |  |  |
G.GURU Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity purchase |  | 0 |  | 0 |  | 452 |
UD4M Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 8 |  | 3 |  | 2 |
Electricity purchase |  | 0 |  | 117 |  | 313 |
Dongbu Highway Solar Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 11 |  | 11 |  | 8 |
Electricity purchase |  | 2,951 |  | 2,937 |  | 3,516 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 1 |  | 1 |  |  |
Trade payables |  | 241 |  |  |  |  |
Non-trade payables and others |  | 1 |  |  |  |  |
Seobu Highway Solar Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 13 |  | 12 |  | 8 |
Electricity purchase |  | 2,899 |  | 2,880 |  | 3,452 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 1 |  | 1 |  |  |
Trade payables |  | 231 |  |  |  |  |
Non-trade payables and others |  | 2 |  |  |  |  |
Songsan Green Energy Co., Ltd |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Interest income/ Dividends income |  | 174 |  | 0 |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Non-trade receivables and others |  | 190 |  |  |  |  |
REC's Innovation Co., Ltd. (formerly, Wang San Engineering. Co,. Ltd.) |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Interest income/ Dividends income |  | 23 |  | 6 |  | 0 |
Dreams Co.,Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Others |  | 30 |  | 0 |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Non-trade receivables and others |  | 1 |  |  |  |  |
Non-trade payables and others |  | 30 |  |  |  |  |
DEEPAI Co.,Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Others |  | 30 |  | 0 |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Non-trade receivables and others |  | 1 |  |  |  |  |
Non-trade payables and others |  | 30 |  |  |  |  |
Green Radiation Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Ordinary development expense |  | 45 |  | 11 |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Non-trade payables and others |  | 30 |  |  |  |  |
Gwangbaek Solar Power Investment Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 523 |  | 644 |  | 0 |
Electricity purchase |  | 499 |  | 565 |  | 602 |
Go deok Clean Energy Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 11,376 |  | 4,685 |  | 0 |
Electricity purchase |  | 35,055 |  | 11,545 |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Non-trade receivables and others |  | 10,118 |  | 4,562 |  |  |
Non-trade payables and others |  | 3,022 |  | 5,288 |  |  |
Changwon SG Energy Co., Ltd |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 9 |  | 0 |  | 0 |
Electricity purchase |  | 1,080 |  | 0 |  | 0 |
SureDataLab Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 0 |  | 1 |  | 1 |
Others |  | 72 |  | 0 |  | 0 |
Suwon New Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | (102) |  | 91 |  | 118 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  |  |  | 876 |  |  |
Non-trade receivables and others |  |  |  | 560 |  |  |
Non-trade payables and others |  | 1 |  | 0 |  |  |
Kosture Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 0 |  | 0 |  | 5 |
PlatformN. Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Others |  | 0 |  | 16 |  | 14 |
Others |  | 237 |  | 0 |  | 475 |
Gangneung Sacheon Fuel Cell Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 8,343 |  | 133 |  | 151 |
Electricity purchase |  | 32,689 |  | 1,324 |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 8,343 |  |  |  |  |
Non-trade payables and others |  | 3,201 |  |  |  |  |
Muan Sunshine Solar Power Plant Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 630 |  | 403 |  | 17 |
Electricity purchase |  | 15,697 |  | 16,328 |  | 19,514 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade payables |  | 1,954 |  | 1,440 |  |  |
13 Associates (Overseas) |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 243,651 |  | 386,191 |  | 548,507 |
Electricity purchase |  | 98,753 |  | 91,233 |  | 101,790 |
Seobusambo highway photovoltaics Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 20 |  | 16 |  | 3 |
Electricity purchase |  | 825 |  | 502 |  | 103 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 1 |  | 1 |  |  |
Non-trade receivables and others |  | 4 |  | 4 |  |  |
Naepo Green Energy Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 3,972 |  | 3,462 |  | 761 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 325 |  | 190 |  |  |
Non-trade receivables and others |  | 458 |  | 1 |  |  |
Yangyang Suri Wind Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 202 |  | 169 |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Non-trade receivables and others |  | 55 |  | 55 |  |  |
Cheongna Energy Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Others |  | 38,349 |  | 32,835 |  | 39,802 |
Service |  | 60 |  | 60 |  | 80 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 7,033 |  | 13,898 |  |  |
Non-trade receivables and others |  | 3,229 |  | 2,160 |  |  |
Non-trade payables and others |  | 8 |  | 1 |  |  |
Boim Combined Heat and Power Generation Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Service |  | 2,073 |  | 2,110 |  | 7,761 |
Service | [7] | 3,038 |  | 8,151 |  | 13,872 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 47 |  | 84 |  |  |
Trade payables |  | 445 |  | 721 |  |  |
Non-trade receivables and others |  | 3,208 |  | 10,779 |  |  |
Non-trade payables and others |  | 13,824 |  | 14,193 |  |  |
Namyangju Combined Heat and Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Service |  | 2,493 |  | 0 |  | 0 |
Daegu Green Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 2,385 |  | 1,694 |  | 1,190 |
Electricity purchase |  | 328,485 |  | 370,787 |  | 508,601 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 182 |  | 122 |  |  |
Trade payables |  | 25,622 |  | 32,222 |  |  |
Non-trade receivables and others |  | 503 |  | 55 |  |  |
Honam Wind Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 529 |  | 610 |  | 242 |
Electricity purchase |  | 7,148 |  | 8,643 |  | 7,662 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade payables |  | 515 |  | 515 |  |  |
KAPES, Inc. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Commission |  | 1,531 |  | 1,604 |  | 450 |
Commission |  | 23,924 |  | 19,112 |  | 9,306 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 4 |  | 4 |  |  |
Non-trade receivables and others |  | 90,088 |  | 89 |  |  |
Non-trade payables and others |  | 3,041 |  | 3,791 |  |  |
Korea Power Engineering Service Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Service |  | 777 |  | 159 |  | 268 |
Service |  | 551 |  | 812 |  | 830 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Non-trade receivables and others |  | 52 |  | 48 |  |  |
Non-trade payables and others |  |  |  | 76 |  |  |
Seokmun Energy Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Service |  | 1,774 |  | 1,792 |  | 1,685 |
Service |  | 51,924 |  | 60,009 |  | 60,799 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 35 |  | 44 |  |  |
Trade payables |  | 7,156 |  | 7,000 |  |  |
Non-trade receivables and others |  | 862 |  | 199 |  |  |
Incheon New Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Construction revenue |  | 26 |  | 458 |  | 14 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 9 |  |  |  |  |
Chun-cheon Energy Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 968 |  | 2,976 |  | 2,505 |
Electricity purchase |  | 430,697 |  | 585,656 |  | 585,689 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  |  |  | 239 |  |  |
Trade payables |  | 35,325 |  | 79,117 |  |  |
Non-trade receivables and others |  |  |  | 165 |  |  |
Non-trade payables and others |  |  |  | 2 |  |  |
Yeonggwangbaeksu Wind Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 2,031 |  | 1,962 |  | 1,898 |
Electricity purchase |  | 12,294 |  | 17,228 |  | 13,990 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 9 |  | 10 |  |  |
Trade payables |  | 962 |  | 1,076 |  |  |
Non-trade receivables and others |  | 178 |  |  |  |  |
Samcheok Eco Materials Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity purchase | [1] | 3,282 |  | 0 |  | 0 |
Yeonggwang Wind Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 943 |  | 3,607 |  | 871 |
Electricity purchase |  | 31,712 |  | 40,605 |  | 31,221 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 12 |  | 15 |  |  |
Trade payables |  | 4,591 |  | 2,251 |  |  |
Non-trade receivables and others |  | 58 |  | 56 |  |  |
NH-Amundi Global Infrastructure Investment Private Investment Trust 21 |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Service |  | 0 |  | 1,568 |  | 1,415 |
Seungmun Green Energy |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 79 |  | 0 |  | 0 |
Electricity purchase |  | 25,725 |  | 0 |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Non-trade receivables and others |  | 34 |  |  |  |  |
KW Nuclear Components Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Service |  | 1,645 |  | 1,612 |  | 1,624 |
Service |  | 6,880 |  | 14,114 |  | 9,504 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Non-trade receivables and others |  |  |  | 17 |  |  |
KEPCO-Uhde Inc. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales | [8] | 0 |  | 0 |  | 12 |
Busan Shinho Solar Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 699 |  | 1,205 |  | 502 |
Electricity purchase |  | 8,467 |  | 10,248 |  | 10,601 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 3 |  | 3 |  |  |
Trade payables |  | 915 |  | 304 |  |  |
Expressway Solar-light Power Generation Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 0 |  | 43 |  | 0 |
Electricity purchase |  | 3,165 |  | 3,362 |  | 4,016 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade payables |  | 432 |  | 220 |  |  |
Goheung New Energy Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales | [7] | 3,106 |  | 3,214 |  | 141 |
Electricity purchase | $ |  |  | $ 10,133 |  | $ 5,264 |  | $ 0
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 21 |  |  |  |  |
Non-trade receivables and others |  | 8 |  |  |  |  |
Gunsan Land Solar Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 944 |  | 809 |  | 518 |
Electricity purchase |  | 2,752 |  | 486 |  | 533 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Non-trade receivables and others |  | 217 |  | 295 |  |  |
Daesan Green Energy Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 426 |  | 760 |  | 394 |
Electricity purchase |  | 154,623 |  | 139,721 |  | 129,736 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 4 |  | 13 |  |  |
Trade payables |  | 3,819 |  | 4,946 |  |  |
Non-trade receivables and others |  | 211 |  | 170 |  |  |
Cheong-Song Noraesan Wind Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 38 |  | 901 |  | 698 |
Electricity purchase |  | 2,048 |  | 882 |  | 980 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  |  |  | 2 |  |  |
Chungsongmeon BongSan wind power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 1 |  | 1 |  | 1 |
Saemangeum Solar Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Service |  | 0 |  | 0 |  | 100 |
Electricity purchase |  | 0 |  | 0 |  | 1 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Non-trade receivables and others |  | 4,368 |  | 4,368 |  |  |
Dangjin Eco Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 42 |  | 40 |  | 32 |
Electricity purchase |  | 3,645 |  | 5,583 |  | 5,696 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 4 |  | 4 |  |  |
Trade payables |  | 282 |  | 222 |  |  |
Non-trade payables and others |  | 181 |  | 176 |  |  |
Yangyang Wind Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 238 |  | 13 |  | 0 |
Service and Electricity Sales |  | 3,599 |  | 10 |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Non-trade receivables and others |  | 163 |  | 13 |  |  |
Energyco Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 161 |  | 457 |  | 463 |
Electricity purchase |  | 5,788 |  | 6,539 |  | 7,898 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade payables |  | 432 |  | 99 |  |  |
Non-trade receivables and others |  | 124 |  | 3 |  |  |
Hapcheon Floating Photovoltaic Power Plant Inc. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 905 |  | 88 |  | 544 |
Service and REC |  | 4,759 |  | 0 |  | 2,526 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 12 |  | 10 |  |  |
Non-trade receivables and others |  | 59 |  | 68 |  |  |
Busan Industrial Solar Power Co., Ltd. |  |  |  |  |  |  |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 2 |  | 2 |  |  |
Trade payables |  | 240 |  |  |  |  |
Omisan Wind Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 279 |  | 26 |  | 1 |
Electricity purchase |  | 638 |  | 0 |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Non-trade receivables and others |  | 146 |  |  |  |  |
Busan Industrial Solar Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 23 |  | 22 |  | 14 |
Electricity purchase |  | 2,493 |  | 3,656 |  | 4,575 |
Bitsolar Energy Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 464 |  | 357 |  | 498 |
Electricity purchase |  | 9,072 |  | 12,946 |  | 13,030 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 12 |  |  |  |  |
Trade payables |  | 207 |  | 201 |  |  |
Non-trade receivables and others |  | 444 |  | 1 |  |  |
Changwon Nu-ri Energy Co., Ltd |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Service |  | 171 |  | 0 |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Non-trade receivables and others |  | 188 |  |  |  |  |
Jeonju Bio Green Energy Co., Ltd |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Service |  | 170 |  | 0 |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Non-trade receivables and others |  | 187 |  |  |  |  |
Haemodum Solar Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 39 |  | 431 |  | 42 |
Electricity purchase |  | 544 |  | 402 |  | 2,168 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 1 |  | 1 |  |  |
Yeongam Solar Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 545 |  | 1,131 |  | 379 |
Electricity purchase |  | 24,004 |  | 34,981 |  | 44,745 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 48 |  | 56 |  |  |
Trade payables |  | 5,723 |  | 3,517 |  |  |
Yeongwol Eco Wind Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 0 |  | 102 |  | 0 |
Electricity purchase |  | 2,496 |  | 0 |  | 0 |
Samsu Wind Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 301 |  | 514 |  | 0 |
Electricity purchase |  | 6,864 |  | 8,269 |  | 10,605 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade payables |  | 1,834 |  | 1,229 |  |  |
Cheongju Eco Park Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 316 |  | 6,397 |  | 204 |
Electricity purchase |  | 34,601 |  | 95,059 |  | 94,409 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  |  |  | 6,899 |  |  |
Trade payables |  | 9,105 |  | 7,994 |  |  |
Non-trade receivables and others |  | 13,461 |  |  |  |  |
Non-trade payables and others |  | 2,853 |  |  |  |  |
Solaseado Solar Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 1,870 |  | 1,876 |  | 1,851 |
Electricity purchase | [7] | 24,899 |  | 18,259 |  | 28,698 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Non-trade receivables and others |  | 15 |  | 24 |  |  |
Shin-han BNPP Private Investment Trust for East-West Sunlight Dream |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Dividends income |  | 87 |  | 0 |  | 0 |
Gurae Resident Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 0 |  | 8 |  | 0 |
Electricity purchase |  | 476 |  | 1 |  | 0 |
Enel X Midland Photovoltaic, LLC |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 11 |  | 11 |  | 12 |
Electricity purchase |  | 3,200 |  | 2,431 |  | 1,871 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 1 |  | 1 |  |  |
Trade payables |  | 204 |  | 144 |  |  |
Non-trade payables and others |  | 59 |  | 49 |  |  |
Eumseong Eco Park Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 19 |  | 19 |  | 2 |
Electricity purchase |  | 26,372 |  | 27,765 |  | 0 |
Geumsungsan Wind Power Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 58 |  | 68 |  | 7 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 3 |  | 4 |  |  |
43 Joint ventures (Overseas) |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 518,941 |  | 747,301 |  | 606,513 |
Electricity purchase |  | 14,796 |  | 17,222 |  | 16,859 |
Korea Development Bank |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Electricity sales |  | 4,368 |  | 5,467 |  | 4,134 |
Dividends paid |  | 0 |  | 0 |  | 12 |
Interest income |  | 10,324 |  | 5,930 |  | 2,222 |
Interest expense |  | 7,839 |  | 5,559 |  | 4,208 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Non-trade receivables and others |  | 34,138 |  | 33,140 |  |  |
Non-trade payables and others |  | 231 |  | 147 |  |  |
Derivative assets |  | 273,627 |  | 45,898 |  |  |
Derivative liabilities |  | 2,421 |  | 72,050 |  |  |
9 Associates (Overseas) |  |  |  |  |  |  |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 59,651 |  | 77,814 |  |  |
Non-trade payables and others |  |  |  | 6,242 |  |  |
Global Trade Of Power System Co., Ltd. |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Service |  | 511 |  | 223 |  | ₩ 715 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Non-trade payables and others |  | 7 |  |  |  |  |
Development Co., Ltd |  |  |  |  |  |  |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade payables |  | 1,291 |  | 2,021 |  |  |
Non-trade payables and others |  | 8,832 |  | 8,077 |  |  |
27 Joint ventures (Overseas) |  |  |  |  |  |  |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |
Trade receivables |  | 271,219 |  | 160,474 |  |  |
Non-trade receivables and others |  | 59,839 |  | 55,897 |  |  |
Non-trade payables and others |  | ₩ 34,932 |  | ₩ 22,877 |  |  |
[1] | Samcheok Eco Materials Co., Ltd. was reclassified from an associate to a joint venture for the year ended December 31, 2024.
[2] | YTN Co., Ltd. is not a related party of the Company as of December 31, 2024, as the sale of shares was completed for the year ended December 31, 2024.
[3] | Korea Electric Vehicle Charging Service is not a related party of the Company as of December 31, 2022 as the sale of shares was completed for the year ended December 31, 2022.
[4] | Taebaek Wind Power Co., Ltd. was changed from an associate to a joint venture for the year ended December 31, 2023.
[5] | Changjuk Wind Power Co., Ltd. was reclassified from an associate to a subsidiary for the year ended December 31, 2022, and the amount is before reclassification to a subsidiary.
[6] | Namjeongsusang Solar Power Operation Co., Ltd. is not a related party of the Company as of December 31, 2024, as the sale of shares was completed for the year ended December 31, 2023.
[7] | Reclassified from a joint venture to a subsidiary during the year ended December 31, 2022. Transactions are made before the reclassification.
[8] | KEPCO-Uhde Inc. is not a related party of the Company as of December 31, 2023 as the liquidation process was completed for the year ended December 31, 2023.

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