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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, 2023 KRW (₩) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 KRW (₩) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 KRW (₩) | Dec. 31, 2021 USD ($)
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Dividend income |  | ₩ 25,941 |  |  | ₩ 28,875 |  |  | ₩ 10,522 |
Korea Gas Corporation |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 140,630 |  |  | 155,309 |  |  | 96,362 |
Electricity purchase |  | 8,873,781 |  |  | 11,996,402 |  |  | 5,646,713 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 14,671 |  |  | 12,415 |  |  |  |
Trade payables |  | 480,974 |  |  | 1,882,607 |  |  |  |
Non-trade receivables and others |  | 12,513 |  |  | 54,232 |  |  |  |
Non-trade payables and others |  | 1,378 |  |  | 1,294 |  |  |  |
Goseong Green Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 842,270 |  |  | 1,062,108 |  |  | 514,470 |
Electricity purchase |  | 1,572,074 |  |  | 1,905,502 |  |  | 987,540 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 55,719 |  |  | 76,254 |  |  |  |
Trade payables |  | 120,270 |  |  | 182,095 |  |  |  |
Non-trade receivables and others |  | 15 |  |  | 14 |  |  |  |
Non-trade payables and others |  | 48,621 |  |  | 52,515 |  |  |  |
Dongducheon Dream Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 16,138 |  |  | 8,942 |  |  | 19,923 |
Electricity purchase |  | 1,744,247 |  |  | 2,244,332 |  |  | 750,148 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 2,573 |  |  | 592 |  |  |  |
Trade payables |  | 117,975 |  |  | 293,256 |  |  |  |
Non-trade receivables and others |  | 478 |  |  | 270 |  |  |  |
Saemangeum Sebit Power Plant Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 2,313 |  |  | 1,418 |  |  | 0 |
Electricity purchase |  | 22,365 |  |  | 23,159 |  |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Non-trade receivables and others |  | 341 |  |  | 653 |  |  |  |
Non-trade payables and others |  |  |  |  | 0 |  |  |  |
Daejung Offshore Wind Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 84 |  |  | 46 |  |  | 46 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Non-trade receivables and others |  | 263 |  |  | 123 |  |  |  |
Daegu Photovoltaic Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 408 |  |  | 268 |  |  | 207 |
Electricity purchase |  | 4,247 |  |  | 4,744 |  |  | 3,532 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade payables |  | 105 |  |  | 135 |  |  |  |
Non-trade payables and others |  |  |  |  | 2 |  |  |  |
Haeng Bok Do Si Photovoltaic Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 3 |  |  | 2 |  |  | 2 |
Electricity purchase |  | 408 |  |  | 563 |  |  | 393 |
Korea Electric Power Industrial Development Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Service |  | 11,115 |  |  | 10,369 |  |  | 11,208 |
Service |  | 305,105 |  |  | 251,468 |  |  | 241,925 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 176 |  |  | 164 |  |  |  |
Trade payables |  | 2,021 |  |  | 150 |  |  |  |
Non-trade receivables and others |  |  |  |  | 2 |  |  |  |
Non-trade payables and others |  | 8,077 |  |  | 9,588 |  |  |  |
Gangneung Eco Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Fuel sales |  | 943,063 |  |  | 459,404 |  |  | 14,200 |
Others |  | 6,996 |  |  | 0 |  |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 59,623 |  |  | 19,364 |  |  |  |
Non-trade receivables and others |  |  |  |  | 478 |  |  |  |
Non-trade payables and others |  | 94 |  |  | 94 |  |  |  |
Shin Pyeongtaek Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 91,830 |  |  | 27,486 |  |  | 23,501 |
Electricity purchase |  | 1,040,965 |  |  | 957,294 |  |  | 653,306 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 1,814 |  |  | 7,375 |  |  |  |
Trade payables |  | 86,801 |  |  | 109,274 |  |  |  |
Non-trade receivables and others |  | 4,933 |  |  | 1,068 |  |  |  |
Non-trade payables and others |  | 385 |  |  | 101 |  |  |  |
Noeul Green Energy Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 8,431 |  |  | 9,396 |  |  | 30 |
Electricity purchase |  | 10,466 |  |  | 14,176 |  |  | 10,014 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 6 |  |  | 3 |  |  |  |
Non-trade receivables and others |  | 18,356 |  |  | 9,365 |  |  |  |
Non-trade payables and others |  | 3,005 |  |  | 2,468 |  |  |  |
Samcheok Eco Materials Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 615 |  |  | 546 |  |  | 620 |
Electricity purchase |  | 8,130 |  |  | 12,019 |  |  | 13,612 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 33 |  |  | 46 |  |  |  |
YTN Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 2,908 |  |  | 2,180 |  |  | 1,922 |
Electricity purchase |  | 309 |  |  | 304 |  |  | 388 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 133 |  |  | 112 |  |  |  |
Busan Green Energy Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 10,733 |  |  | 5,055 |  |  | 49 |
Electricity purchase |  | 23,211 |  |  | 26,219 |  |  | 18,996 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 1 |  |  | 1 |  |  |  |
Non-trade receivables and others |  | 32,720 |  |  | 26,681 |  |  |  |
Non-trade payables and others |  | 3,642 |  |  | 4,415 |  |  |  |
Gunsan Bio Energy Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 0 |  |  | 0 |  |  | 20 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Non-trade receivables and others | [1] |  |  |  | 11,728 |  |  |  |
Korea Electric Vehicle Charging Service |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales | [2] | 0 |  |  | 3,686 |  |  | 3,039 |
Electricity purchase | [2] | 0 |  |  | 0 |  |  | 393 |
Energy Infra Asset Management Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 89 |  |  | 0 |  |  | 4,629 |
Service |  | 2,701 |  |  | 2,779 |  |  | 2,657 |
YaksuESS Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity purchase |  | 508 |  |  | 851 |  |  | 1,715 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade payables |  | 538 |  |  |  |  |  |  |
Gangwon Wind Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 2,464 |  |  | 1,549 |  |  | 1,865 |
Electricity purchase |  | 32,525 |  |  | 40,130 |  |  | 19,623 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 13 |  |  | 6 |  |  |  |
Trade payables |  | 3,206 |  |  | 5,197 |  |  |  |
Goesan Solar park Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity purchase |  | 6,530 |  |  | 7,642 |  |  | 6,209 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade payables |  | 56 |  |  | 346 |  |  |  |
Gwangyang Green Energy Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 1,492 |  |  | 1,848 |  |  | 486 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 1,069 |  |  |  |  |  |  |
Non-trade receivables and others |  | 716 |  |  | 1,436 |  |  |  |
Bigeum Resident Photovoltaic Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 888 |  |  | 660 |  |  | 755 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 406 |  |  | 343 |  |  |  |
Non-trade receivables and others |  | 1,316 |  |  | 516 |  |  |  |
Hyundai Green Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales and design service |  | 6,668 |  |  | 7,063 |  |  | 11,934 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 903 |  |  | 839 |  |  |  |
Korea Power Exchange |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Service |  | 52,262 |  |  | 16,596 |  |  | 39,796 |
Service |  | 82,572 |  |  | 93,817 |  |  | 86,716 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 1,583 |  |  | 223 |  |  |  |
Trade payables |  | 16,367 |  |  |  |  |  |  |
Non-trade receivables and others |  | 1 |  |  |  |  |  |  |
Non-trade payables and others |  | 2,520 |  |  | 2,405 |  |  |  |
Taebaek Wind Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Service | [3] | 0 |  |  | 861 |  |  | 44 |
Others | [3] | 2,864 |  |  | 0 |  |  | 0 |
Service | [3] | 7,476 |  |  | 0 |  |  | 0 |
Service and REC | [3] | 0 |  |  | 7,442 |  |  | 5,930 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade payables |  | 603 | [3] |  | 680 |  |  |  |
Non-trade payables and others |  | 341 | [3] |  | 178 |  |  |  |
Taebaek Guinemi Wind Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 0 |  |  | 0 |  |  | 26 |
Electricity purchase |  | 5,529 |  |  | 6,793 |  |  | 5,910 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade payables |  | 572 |  |  |  |  |  |  |
Non-trade payables and others |  | 286 |  |  | 885 |  |  |  |
Pyeongchang Wind Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 0 |  |  | 1,323 |  |  | 1,180 |
Design service and others |  | 0 |  |  | 3,884 |  |  | 4,099 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 4 |  |  | 3 | [3] |  |  |
Non-trade payables and others |  |  |  |  | 211 |  |  |  |
Pyeongchang Wind Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 2,087 |  |  | 0 |  |  | 0 |
REC and others |  | 3,542 |  |  | 0 |  |  | 0 |
Daeryun Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 3,187 |  |  | 2,016 |  |  | 1,944 |
Electricity purchase |  | 353,371 |  |  | 428,534 |  |  | 157,234 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 326 |  |  | 195 |  |  |  |
Trade payables |  | 32,140 |  |  | 55,725 |  |  |  |
Changjuk Wind Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales | [4] | 0 |  |  | 1,350 |  |  | 463 |
Electricity purchase | [4] | 0 |  |  | 9,027 |  |  | 6,213 |
GS Donghae Electric Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 28,164 |  |  | 5,238 |  |  | 21,127 |
Electricity purchase |  | 1,047,584 |  |  | 1,035,263 |  |  | 760,377 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 159 |  |  | 872 |  |  |  |
Trade payables |  | 72,951 |  |  | 72,947 |  |  |  |
Non-trade receivables and others |  | 169 |  |  | 1,558 |  |  |  |
Non-trade payables and others |  | 125 |  |  | 14,565 |  |  |  |
KNH Solar Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 15 |  |  | 13 |  |  | 14 |
Electricity purchase |  | 3,535 |  |  | 4,348 |  |  | 3,222 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 1 |  |  | 1 |  |  |  |
S-Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Service |  | 4,965 |  |  | 4,588 |  |  | 5,229 |
Service |  | 973,646 |  |  | 1,091,741 |  |  | 608,530 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 213 |  |  | 77 |  |  |  |
Trade payables |  | 79,459 |  |  | 135,504 |  |  |  |
Non-trade receivables and others |  | 53 |  |  | 44 |  |  |  |
Non-trade payables and others |  |  |  |  | 11 |  |  |  |
Chuncheon Green Energy Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 82 |  |  | 2 |  |  | 0 |
Yeongyang Wind Power Corporation II |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Commission |  | 150 |  |  | 0 |  |  | 0 |
Commission |  | 1,457 |  |  | 0 |  |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Non-trade receivables and others |  | 165 |  |  |  |  |  |  |
PND Solar Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 547 |  |  | 427 |  |  | 416 |
Electricity purchase |  | 5,301 |  |  | 6,173 |  |  | 5,502 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade payables |  | 296 |  |  | 210 |  |  |  |
Hyundai Eco Energy Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 1,236 |  |  | 277 |  |  | 187 |
Electricity purchase |  | 26,266 |  |  | 29,209 |  |  | 25,762 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 28 |  |  | 22 |  |  |  |
Trade payables |  | 408 |  |  | 738 |  |  |  |
YeongGwang Yaksu Wind Electric Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 96 |  |  | 66 |  |  | 78 |
Electricity purchase |  | 6,776 |  |  | 7,382 |  |  | 11,729 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 10 |  |  | 7 |  |  |  |
Trade payables |  | 828 |  |  | 589 |  |  |  |
Non-trade receivables and others |  | 2,294 |  |  |  |  |  |  |
Non-trade payables and others |  |  |  |  | 2,050 |  |  |  |
Taebaek Gadeoksan Wind Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 3,998 |  |  | 1,952 |  |  | 295 |
Electricity purchase |  | 34,940 |  |  | 25,880 |  |  | 16,360 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade payables |  | 12,739 |  |  | 12,739 |  |  |  |
Non-trade receivables and others |  | 1,539 |  |  | 97 |  |  |  |
Non-trade payables and others |  | 7 |  |  | 5 |  |  |  |
Korea Energy Solutions Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 2 |  |  | 2 |  |  | 2 |
Electricity purchase |  | 128 |  |  | 102 |  |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Non-trade payables and others |  |  |  |  | 94 |  |  |  |
ITR Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Service |  | 3 |  |  | 6 |  |  | 3 |
STN Co., Ltd. (formerly, Structure test network Co., Ltd.) |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Service |  | 0 |  |  | 7 |  |  | 5 |
Others |  | 10 |  |  | 0 |  |  | 0 |
Green Energy Electricity Generation Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity purchase |  | 948 |  |  | 2,962 |  |  | 1,238 |
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 | [5] | 31 |  |  | 21 |  |  | 22 |
Electricity purchase | [5] | 0 |  |  | 9,491 |  |  | 14,286 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables | [5] |  |  |  | 2 |  |  |  |
Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Service |  | 405 |  |  | 394 |  |  | 399 |
Bitgoel Eco Energy Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 1,581 |  |  | 1,397 |  |  | 282 |
Service and others |  | 28,334 |  |  | 930 |  |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade payables |  | 6,226 |  |  |  |  |  |  |
Non-trade receivables and others |  | 131 |  |  | 6 |  |  |  |
Non-trade payables and others |  |  |  |  | 1,023 |  |  |  |
Jeju Gimnyeong Wind Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 315 |  |  | 367 |  |  | 0 |
Electricity purchase |  | 8,635 |  |  | 12,364 |  |  | 12,833 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade payables |  | 1,467 |  |  | 1,758 |  |  |  |
Non-trade receivables and others |  | 112 |  |  | 130 |  |  |  |
Non-trade payables and others |  | 9 |  |  |  |  |  |  |
Seoroseoro Sunny Power Plant Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 2 |  |  | 1 |  |  | 0 |
REC and others |  | 874 |  |  | 1,138 |  |  | 217 |
Muan Solar park Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 3,083 |  |  | 950 |  |  | 232 |
REC and others |  | 16,554 |  |  | 17,052 |  |  | 31,017 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  |  |  |  | 25 |  |  |  |
Non-trade receivables and others |  | 4 |  |  | 9 |  |  |  |
YuDang Solar Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 100 |  |  | 160 |  |  | 0 |
REC and others |  | 1,860 |  |  | 1,915 |  |  | 3,495 |
Anjwa Smart Farm & Solar City Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 2,479 |  |  | 1,068 |  |  | 624 |
Electricity purchase |  | 17,332 |  |  | 16,942 |  |  | 24,601 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Non-trade payables and others |  | 1,296 |  |  | 921 |  |  |  |
KPE Green Energy Co., Ltd. (formerly, Daewon Green Energy Co., Ltd.) |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 163 |  |  | 185 |  |  | 155 |
Others |  | 62,212 |  |  | 42,651 |  |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 1 |  |  | 1 |  |  |  |
Trade payables |  | 5,485 |  |  | 5,485 |  |  |  |
Saemangeum Heemang Photovoltaic Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 3,538 |  |  | 5,740 |  |  | 13 |
Electricity purchase |  | 440 |  |  | 1,039 |  |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Non-trade receivables and others |  |  |  |  | 3,435 |  |  |  |
Non-trade payables and others |  |  |  |  | 1 |  |  |  |
G.GURU Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity purchase |  | 0 |  |  | 452 |  |  | 0 |
UD4M Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 3 |  |  | 2 |  |  | 4 |
Electricity purchase |  | 117 |  |  | 313 |  |  | 0 |
Dongbu Highway Solar Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 11 |  |  | 8 |  |  | 5 |
Electricity purchase |  | 2,937 |  |  | 3,516 |  |  | 2,605 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 1 |  |  | 1 |  |  |  |
Trade payables |  |  |  |  | 2 |  |  |  |
Non-trade payables and others |  |  |  |  | 2 |  |  |  |
Seobu Highway Solar Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 12 |  |  | 8 |  |  | 8 |
Electricity purchase |  | 2,880 |  |  | 3,452 |  |  | 2,963 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 1 |  |  | 1 |  |  |  |
Trade payables |  |  |  |  | 8 |  |  |  |
Non-trade payables and others |  |  |  |  | 3 |  |  |  |
REC's Innovation Co., Ltd. (formerly, Wang San Engineering. Co,. Ltd.) |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Interest income/ Dividends income | [6] | 6 |  |  | 0 |  |  | 0 |
Green Radiation Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Ordinary development expense |  | 11 |  |  | 0 |  |  | 0 |
Santiago Solar Power SpA |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Dividend income |  | 586 |  |  | 0 |  |  | 0 |
Gwangbaek Solar Power Investment Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 644 |  |  | 0 |  |  | 0 |
Electricity purchase |  | 565 |  |  | 602 |  |  | 742 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Non-trade payables and others |  |  |  |  | 61 |  |  |  |
Go deok Clean Energy Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 4,685 |  |  | 0 |  |  | 0 |
Electricity purchase |  | 11,545 |  |  | 0 |  |  | 0 |
Hankook Electric Power Information Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 0 |  |  | 0 |  |  | 1 |
SureDataLab Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 1 |  |  | 1 |  |  | 1 |
Suwon New Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 91 |  |  | 118 |  |  | 1,820 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 876 |  |  | 0 |  |  |  |
Non-trade receivables and others |  | 560 |  |  | 1,280 |  |  |  |
Non-trade payables and others |  | 0 |  |  |  |  |  |  |
Kosture Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 0 |  |  | 5 |  |  | 1 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  |  |  |  | 6 |  |  |  |
PlatformN. Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Others |  | 16 |  |  | 14 |  |  | 0 |
Others |  | 0 |  |  | 475 |  |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Non-trade payables and others |  |  |  |  | 232 |  |  |  |
Gangneung Sacheon Fuel Cell Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 133 |  |  | 151 |  |  | 0 |
Electricity purchase |  | 1,324 |  |  | 0 |  |  | 0 |
Muan Sunshine Solar Power Plant Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 403 |  |  | 17 |  |  | 52 |
Electricity purchase |  | 16,328 |  |  | 19,514 |  |  | 15,900 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade payables |  | 1,440 |  |  | 3,076 |  |  |  |
Non-trade payables and others |  |  |  |  | 1,265 |  |  |  |
11 Associates (Overseas) |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 385,605 |  |  | 548,507 |  |  | 125,723 |
Electricity purchase |  | 91,233 |  |  | 101,790 |  |  | 502 |
Seobusambo highway photovoltaics Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 16 |  |  | 3 |  |  | 0 |
Electricity purchase |  | 502 |  |  | 103 |  |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 1 |  |  |  |  |  |  |
Non-trade receivables and others |  | 4 |  |  |  |  |  |  |
Yangyang Suri Wind Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 169 |  |  | 0 |  |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Non-trade receivables and others |  | 55 |  |  |  |  |  |  |
Naepo Green Energy Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 3,462 |  |  | 761 |  |  | 467 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 190 |  |  | 169 |  |  |  |
Non-trade receivables and others |  | 1 |  |  |  |  |  |  |
Non-trade payables and others |  |  |  |  | 3 |  |  |  |
Cheongna Energy Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Others |  | 32,835 |  |  | 39,802 |  |  | 16,469 |
Electricity purchase |  | 60 |  |  | 80 |  |  | 57 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 13,898 |  |  | 17,324 |  |  |  |
Non-trade receivables and others |  | 2,160 |  |  | 1,654 |  |  |  |
Non-trade payables and others |  | 1 |  |  | 1 |  |  |  |
Boim Combined Heat and Power Generation Co., Ltd. (formerly, Dayone Energy Co., Ltd.) |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Service |  | 2,110 |  |  | 7,761 |  |  | 8,159 |
Electricity purchase | [7] | 8,151 |  |  | 13,872 |  |  | 5,409 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 84 |  |  | 79 |  |  |  |
Trade payables |  | 721 |  |  | 1,027 |  |  |  |
Non-trade receivables and others |  | 10,779 |  |  | 10,218 |  |  |  |
Non-trade payables and others |  | 14,193 |  |  | 9,119 |  |  |  |
Daegu Green Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 1,694 |  |  | 1,190 |  |  | 1,053 |
Electricity purchase |  | 370,787 |  |  | 508,601 |  |  | 289,052 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 122 |  |  | 53 |  |  |  |
Non-trade receivables and others |  | 55 |  |  | 56 |  |  |  |
Non-trade payables and others |  | 32,222 |  |  | 66,715 |  |  |  |
KAPES, Inc. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Commission |  | 1,604 |  |  | 450 |  |  | 413 |
Electricity purchase |  | 19,112 |  |  | 9,306 |  |  | 64,140 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 4 |  |  | 2 |  |  |  |
Non-trade receivables and others |  | 89 |  |  |  |  |  |  |
Non-trade payables and others |  | 3,791 |  |  | 106 |  |  |  |
Prime Swedish Holding AB |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 292 |  |  | 284 |  |  | 0 |
Honam Wind Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 610 |  |  | 242 |  |  | 71 |
Electricity purchase |  | 8,643 |  |  | 7,662 |  |  | 4,807 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade payables |  | 515 |  |  | 515 |  |  |  |
Jeongam Wind Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales and design service |  | 0 |  |  | 0 |  |  | 588 |
Electricity purchase |  | 0 |  |  | 0 |  |  | 3,145 |
Korea Power Engineering Service Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Service |  | 159 |  |  | 268 |  |  | 339 |
Service |  | 812 |  |  | 830 |  |  | 1,315 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Non-trade receivables and others |  | 48 |  |  | 47 |  |  |  |
Non-trade payables and others |  | 76 |  |  | 77 |  |  |  |
Seokmun Energy Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Service |  | 1,792 |  |  | 1,685 |  |  | 1,701 |
Service |  | 60,009 |  |  | 60,799 |  |  | 44,315 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 44 |  |  | 67 |  |  |  |
Trade payables |  | 7,000 |  |  | 7,000 |  |  |  |
Non-trade receivables and others |  | 199 |  |  | 113 |  |  |  |
Incheon New Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Construction revenue |  | 458 |  |  | 14 |  |  | 14 |
Chun-cheon Energy Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 2,976 |  |  | 2,505 |  |  | 2,329 |
Electricity purchase |  | 585,656 |  |  | 585,689 |  |  | 327,536 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 239 |  |  | 124 |  |  |  |
Trade payables |  | 79,117 |  |  | 79,117 |  |  |  |
Non-trade receivables and others |  | 165 |  |  | 165 |  |  |  |
Non-trade payables and others |  | 2 |  |  |  |  |  |  |
Yeonggwangbaeksu Wind Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 1,962 |  |  | 1,898 |  |  | 1,836 |
Electricity purchase |  | 17,228 |  |  | 13,990 |  |  | 9,471 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 10 |  |  | 8 |  |  |  |
Trade payables |  | 1,076 |  |  | 1,076 |  |  |  |
Non-trade receivables and others |  |  |  |  | 166 |  |  |  |
Yeonggwang Wind Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 3,607 |  |  | 871 |  |  | 818 |
Electricity purchase |  | 40,605 |  |  | 31,221 |  |  | 21,004 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 15 |  |  | 12 |  |  |  |
Trade payables |  | 2,251 |  |  | 2,251 |  |  |  |
Non-trade receivables and others |  | 56 |  |  | 62 |  |  |  |
Western Power Changgi Solar Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 0 |  |  | 0 |  |  | 1,920 |
Electricity purchase |  | 0 |  |  | 0 |  |  | 5,852 |
NH-Amundi Global Infrastructure Investment Private Investment Trust 21 |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Service |  | 1,568 |  |  | 1,415 |  |  | 1,727 |
KW Nuclear Components Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Service |  | 1,612 |  |  | 1,624 |  |  | 2,598 |
Service |  | 14,114 |  |  | 9,504 |  |  | 96 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  |  |  |  | 4 |  |  |  |
Non-trade receivables and others |  | 17 |  |  | 18 |  |  |  |
KEPCO-Uhde Inc. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales | [8] | 0 |  |  | 12 |  |  | 10 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Non-trade payables and others | [8] |  |  |  | 10 |  |  |  |
Busan Shinho Solar Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 1,205 |  |  | 502 |  |  | 376 |
REC and others |  | 10,248 |  |  | 10,601 |  |  | 7,895 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 3 |  |  | 3 |  |  |  |
Trade payables |  | 304 |  |  | 304 |  |  |  |
Expressway Solar-light Power Generation Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 43 |  |  | 0 |  |  | 0 |
Electricity purchase |  | 3,362 |  |  | 4,016 |  |  | 3,146 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade payables |  | 220 |  |  | 166 |  |  |  |
Goheung New Energy Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales | [7] | 3,214 |  |  | 141 |  |  | 0 |
Electricity purchase | $ |  |  |  | $ 5,264 |  |  | $ 0 |  | $ 0
Gunsan Land Solar Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 809 |  |  | 518 |  |  | 0 |
Electricity purchase |  | 486 |  |  | 533 |  |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Non-trade receivables and others |  | 295 |  |  | 138 |  |  |  |
Daesan Green Energy Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 760 |  |  | 394 |  |  | 523 |
Electricity purchase |  | 139,721 |  |  | 129,736 |  |  | 146,776 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 13 |  |  | 18 |  |  |  |
Trade payables |  | 4,946 |  |  | 4,946 |  |  |  |
Non-trade receivables and others |  | 170 |  |  | 218 |  |  |  |
Cheong-Song Noraesan Wind Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 901 |  |  | 698 |  |  | 30 |
Electricity purchase |  | 882 |  |  | 980 |  |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 2 |  |  | 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 |  |  | 100 |  |  | 1,141 |
Electricity purchase |  | 0 |  |  | 1 |  |  | 5 |
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 |  | 40 |  |  | 32 |  |  | 32 |
Electricity purchase |  | 5,583 |  |  | 5,696 |  |  | 4,139 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 4 |  |  | 3 |  |  |  |
Trade payables |  | 222 |  |  | 222 |  |  |  |
Non-trade payables and others |  | 176 |  |  | 105 |  |  |  |
Yangyang Wind Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 13 |  |  | 0 |  |  | 0 |
Service and Electricity Sales |  | 10 |  |  | 0 |  |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Non-trade receivables and others |  | 13 |  |  |  |  |  |  |
Energyco Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 457 |  |  | 463 |  |  | 1 |
Electricity purchase |  | 6,539 |  |  | 7,898 |  |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade payables |  | 99 |  |  |  |  |  |  |
Non-trade receivables and others |  | 3 |  |  |  |  |  |  |
Hapcheon Floating Photovoltaic Power Plant Inc. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 88 |  |  | 544 |  |  | 0 |
Service and REC |  | 0 |  |  | 2,526 |  |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 10 |  |  | 9 |  |  |  |
Non-trade receivables and others |  | 68 |  |  |  |  |  |  |
Busan Industrial Solar Power Co., Ltd. |  |  |  |  |  |  |  |  |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 2 |  |  | 2 |  |  |  |
Busan Industrial Solar Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 22 |  |  | 14 |  |  | 9 |
Electricity purchase |  | 3,656 |  |  | 4,575 |  |  | 2,815 |
Bitsolar Energy Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 357 |  |  | 498 |  |  | 296 |
Electricity purchase |  | 12,946 |  |  | 13,030 |  |  | 5,703 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade payables |  | 201 |  |  | 201 |  |  |  |
Non-trade receivables and others |  | 1 |  |  | 222 |  |  |  |
Non-trade payables and others |  | 0 |  |  |  |  |  |  |
Omisan Wind Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 26 |  |  | 1 |  |  | 1 |
Electricity purchase |  | 0 |  |  | 0 |  |  | 7 |
S-Power Chile SpA |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Interest income |  | 20 |  |  | 0 |  |  | 0 |
Haemodum Solar Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 431 |  |  | 42 |  |  | 6 |
Electricity purchase |  | 402 |  |  | 2,168 |  |  | 1,625 |
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 |  | 1,131 |  |  | 379 |  |  | 339 |
Electricity purchase |  | 34,981 |  |  | 44,745 |  |  | 47,805 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 56 |  |  | 44 |  |  |  |
Trade payables |  | 3,517 |  |  | 3,655 |  |  |  |
Samsu Wind Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 514 |  |  | 0 |  |  | 0 |
Electricity purchase |  | 8,269 |  |  | 10,605 |  |  | 2,800 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade payables |  | 1,229 |  |  | 1,303 |  |  |  |
Solaseado Solar Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 1,876 |  |  | 1,851 |  |  | 2,890 |
Electricity purchase | [7] | 18,259 |  |  | 28,698 |  |  | 31,031 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Non-trade receivables and others |  | 24 |  |  | 23 |  |  |  |
Non-trade payables and others |  |  |  |  | 2,911 |  |  |  |
Yeongwol Eco Wind Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 102 |  |  | 0 |  |  | 0 |
Gurae Resident Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 8 |  |  | 0 |  |  | 0 |
Electricity purchase |  | 1 |  |  | 0 |  |  | 0 |
Cheongju Eco Park Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 6,397 |  |  | 204 |  |  | 0 |
Electricity purchase |  | 95,059 |  |  | 94,409 |  |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 6,899 |  |  |  |  |  |  |
Trade payables |  | 7,994 |  |  | 7,994 |  |  |  |
Enel X Midland Photovoltaic, LLC |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 11 |  |  | 12 |  |  | 0 |
Electricity purchase |  | 2,431 |  |  | 1,871 |  |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 1 |  |  | 1 |  |  |  |
Trade payables |  | 144 |  |  | 3 |  |  |  |
Non-trade payables and others |  | 49 |  |  |  |  |  |  |
Eumseong Eco Park Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 19 |  |  | 2 |  |  | 0 |
Electricity purchase |  | 27,765 |  |  | 0 |  |  | 0 |
Geumsungsan Wind Power Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 68 |  |  | 7 |  |  | 0 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 4 |  |  | 3 |  |  |  |
Non-trade payables and others |  |  |  |  | 1 |  |  |  |
41 Joint ventures (Overseas) |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 746,989 |  |  | 606,513 |  |  | 773,291 |
Electricity purchase |  | 17,222 |  |  | 16,859 |  |  | 54,135 |
Korea Development Bank |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Electricity sales |  | 5,467 |  |  | 4,134 |  |  | 4,177 |
Dividends paid |  | 0 |  |  | 12 |  |  | 256,862 |
Interest income |  | 5,930 |  |  | 2,222 |  |  | 756 |
Interest expense |  | 5,559 |  |  | 4,208 |  |  | 2,756 |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Non-trade receivables and others |  | 33,140 |  |  | 30,836 |  |  |  |
Non-trade payables and others |  | 147 |  |  | 101 |  |  |  |
Accrued interest income |  |  |  |  | 5 |  |  |  |
Derivative assets |  | 45,898 |  |  | 67,662 |  |  |  |
Derivative liabilities |  | 72,050 |  |  | 3,759 |  |  |  |
Go deok Clean Energy Co., Ltd |  |  |  |  |  |  |  |  |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Non-trade receivables and others |  | 4,562 |  |  |  |  |  |  |
Non-trade payables and others |  | 5,288 |  |  |  |  |  |  |
9 Associates (Overseas) |  |  |  |  |  |  |  |  |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Non-trade receivables and others |  | 77,814 |  |  | 49,409 |  |  |  |
Non-trade payables and others |  | 6,242 |  |  | 502 |  |  |  |
Tronix Co., Ltd. |  |  |  |  |  |  |  |  |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Non-trade receivables and others |  |  |  |  | 1 |  |  |  |
8 Associates (Overseas) |  |  |  |  |  |  |  |  |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  |  |  |  | 93 |  |  |  |
Global Trade Of Power System Co., Ltd. |  |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |  |
Service |  | 223 |  |  | 715 |  |  | ₩ 323 |
26 Joint ventures (Overseas) |  |  |  |  |  |  |  |  |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables |  | 160,474 |  |  | 73,805 |  |  |  |
Non-trade receivables and others |  | 55,897 |  |  | 71,661 |  |  |  |
Non-trade payables and others |  | 22,877 |  |  | ₩ 117,754 |  |  |  |
KEPCO Lebanon SARL |  |  |  |  |  |  |  |  |
Outstanding balances for related party transactions [abstract] |  |  |  |  |  |  |  |  |
Trade receivables | [9] | ₩ 75 |  |  |  |  |  |  |
[1] | Busan Green Energy Co., Ltd. was declared bankrupt for the year ended December 31, 2023 and was excluded from an associate due to the appointment of a bankruptcy trustee.
[2] | Korea Electric Vehicle Charging Service is not a related party of the Company as of December 31, 2023 as the sale of shares was completed for the year ended December 31, 2022.
[3] | Taebaek Wind Power Co., Ltd. was changed from an associate to a joint venture for the year ended December 31, 2023.
[4] | 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.
[5] | Namjeongsusang Solar Power Operation Co., Ltd. is not a related party of the Company as of December 31, 2023 as the sale of shares was completed for the year ended December 31, 2023.
[6] | The Company has disposed of shares of Korea Electric Vehicle Charging Service during the year ended December 31, 2022, and it is not a related party to the Company as of December 31, 2022.
[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.
[9] | The entire amount has been set as bad debt.

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