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Transactions between related parties (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Associates |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | ₩ 220,801 | ₩ 200,574 | ₩ 144,751
Service sales | 53,838 | 33,727 | 31,936
Design service | 19,321 | 14,295 | 15,197
Dividend paid | 0 | 0 | 0
Commission | 0 | 0 | 0
Technical fee | 0 | 0 | 0
Construction revenue | 0 | 0 | 0
Interest income | 0 | 0 | 0
Interest expense | 0 | 0 | 0
Electricity purchase | 2,584,539 | 2,752,321 | 2,873,781
Purchase of power generation fuel | 3,270,972 | 4,049,486 | 5,191,243
REC purchase | 14,317 | 26,843 | 22,482
Service purchase | 1,151 | 2,060 | 1,006
Rental fee and others | 0 | 0 | 0
Electricity metering service fee | 212,366 | 245,057 | 261,668
Trading fees | 87,361 | 120,509 | 137,489
Woodchip purchase | 0 | 0 | 440
Electricity sales and others | 66,755 | 98,450 | 60,318
Electricity purchase and Others | 0 | 0 | 31
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 19,718 | 13,446 | 13,005
Trade payables | 689,395 | 806,024 | 862,594
Non-trade receivables and others | 33,410 | 14,659 | 8,482
Non-trade payables and others | 140,964 | 77,246 | 78,129
Accrued interest income | 0 | 0 | 0
Derivative assets | 0 | 0 | 0
Derivative liabilities | 0 | 0 | 0
Dongducheon Dream Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 7,757 | 7,071 | 6,093
Electricity purchase | 552,692 | 689,510 | 828,547
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 388 | 323 |
Trade payables | 65,794 | 85,920 |
Non-trade receivables and others | 213 | 267 |
Non-trade payables and others | 0 | 12 |
Korea Gas Corporation |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 97,685 | 116,484 | 99,933
Purchase of power generation fuel | 3,270,972 | 4,049,486 | 5,191,243
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 9,969 | 9,267 |
Trade payables | 428,763 | 462,138 |
Non-trade receivables and others | 95 | 38 |
Non-trade payables and others | 617 | 560 |
Daejung Offshore Wind Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 32 | 1 | 1
Outstanding balances for related party transactions [Abstract] |  |  |
Non-trade receivables and others | 31 | 0 |
Daegu Photovoltaic Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 325 | 327 | 128
REC purchase | 3,313 | 3,626 | 3,745
Outstanding balances for related party transactions [Abstract] |  |  |
Trade payables | 57 | 69 |
Haeng Bok Do Si Photovoltaic Power Co., Ltd. [Member] |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 2 | 2 | 2
REC purchase | 370 | 450 | 455
Korea Electric Power Industrial Development Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service sales | 10,833 | 11,085 | 10,422
Electricity metering service fee | 212,366 | 245,057 | 261,668
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 508 | 243 |
Trade payables | 133 | 3,756 |
Non-trade receivables and others | 16 | 43 |
Non-trade payables and others | 3,779 | 3,827 |
Goseong Green Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 47,701 | 19,245 | 10,024
Electricity purchase | 0 | 32 | 0
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 2,181 | 103 |
Non-trade receivables and others | 9,214 | 5,285 |
Non-trade payables and others | 64,986 | 65,626 |
Gangneung Eco Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service sales | 10,178 | 7,446 | 4,928
Service purchase | 0 | 0 | 19
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 661 | 115 |
Non-trade receivables and others | 146 | 65 |
Shin Pyeongtaek Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 20,791 | 21,218 | 8,468
Electricity purchase | 520,737 | 119,162 | 0
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 1,348 | 1,013 |
Trade payables | 47,948 | 64,696 |
Non-trade receivables and others | 2,823 | 2,281 |
Non-trade payables and others | 85 | 61 |
Noeul Green Energy Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 30 | 30 | 30
REC purchase | 10,634 | 22,767 | 18,282
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 3 | 3 |
Non-trade receivables and others | 969 | 0 |
Non-trade payables and others | 0 | 1,855 |
Samcheok Eco Materials Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 700 | 627 | 605
Electricity purchase | 10,713 | 9,425 | 3,819
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 47 | 59 |
YTN Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 1,805 | 2,257 | 2,043
Electricity purchase | 353 |  |
Service purchase | 353 | 333 | 322
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 97 | 97 |
Busan Green Energy Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 34 | 18 | 19
Electricity purchase | 18,678 | 13,811 | 25,123
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 5 | 1 |
Non-trade receivables and others | 13,946 | 0 |
Non-trade payables and others | 0 | 606 |
Gunsan Bio Energy Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 102 | 4,755 | 3,611
Electricity purchase | 24 | 3,022 | 0
Korea Electric Vehicle Charging Service |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 1,956 | 1,029 | 578
Service purchase | 581 | 536 | 605
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 141 | 137 |
Non-trade receivables and others | 281 | 529 |
Tamra Offshore Wind Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 0 | 0 | 58
Electricity purchase | 0 | 0 | 8,371
Daegu clean Energy Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 0 | 0 | 126
Yaksu ESS Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service purchase | 217 | 1,191 | 0
Outstanding balances for related party transactions [Abstract] |  |  |
Trade payables | 739 | 525 |
Gangwon Wind Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 2,109 | 2,433 | 2,402
Electricity purchase | 23,350 | 24,116 | 25,407
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 6 | 7 |
Trade payables | 2,678 | 2,979 |
Gwangyang Green Energy Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 23 | 122 | 874
Outstanding balances for related party transactions [Abstract] |  |  |
Non-trade receivables and others | 1,356 | 1,334 |
Bigeum Resident Photovoltaic Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 85 |  |
Hyundai Green Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Design service | 17,257 | 13,106 | 14,031
Electricity purchase | 349,778 | 507,662 | 480,815
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 554 | 502 |
Trade payables | 9,825 | 41,587 |
Korea Power Exchange |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service sales | 25,919 | 7,670 | 6,854
Trading fees | 87,361 | 120,509 | 137,489
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 1,608 | 1,142 |
Trade payables | 1,362 |  |
Non-trade receivables and others | 24 | 144 |
Non-trade payables and others | 70,456 | 4,160 |
Ecollite Co., Ltd. |  |  |
Outstanding balances for related party transactions [Abstract] |  |  |
Non-trade receivables and others | 0 | 210 |
Taebaek Wind Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service sales | 226 | 991 | 614
Electricity purchase | 4,003 | 7,070 | 8,582
Outstanding balances for related party transactions [Abstract] |  |  |
Trade payables | 443 | 358 |
Non-trade receivables and others | 1,405 |  |
Non-trade payables and others | 0 | 243 |
Taeback Guinemi Wind Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 37 | 77 | 0
Electricity purchase | 5,023 | 349 | 0
Outstanding balances for related party transactions [Abstract] |  |  |
Trade payables | 413 | 190 |
Non-trade receivables and others | 0 | 2 |
Non-trade payables and others | 509 | 0 |
Pyeongchang Wind Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Design service | 2,064 | 1,189 | 1,166
Electricity purchase | 3,969 | 5,188 | 6,994
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 3 | 4 |
Daeryun Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 1,947 | 1,879 | 1,731
Electricity purchase | 99,523 | 144,862 | 184,063
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 189 | 144 |
Trade payables | 16,079 | 19,843 |
Changjuk Wind Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 2,067 | 927 | 758
Electricity purchase | 6,084 | 6,994 | 7,929
Outstanding balances for related party transactions [Abstract] |  |  |
Trade payables | 461 | 447 |
Non-trade payables and others | 309 | 280 |
GS Donghae Electric Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 31,557 | 15,792 | 7,238
Electricity purchase | 660,351 | 681,379 | 780,233
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 386 | 175 |
Trade payables | 91,213 | 69,811 |
Non-trade receivables and others | 321 | 367 |
Non-trade payables and others | 36 | 16 |
KNH Solar Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 16 | 17 | 17
Electricity purchase | 3,564 | 3,377 | 3,586
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 1 | 1 |
Trade payables | 14 |  |
Non-trade payables and others | 187 | 0 |
S-Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service sales | 6,682 | 6,535 | 9,118
Electricity purchase | 293,515 | 522,469 | 507,875
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 137 | 89 |
Trade payables | 23,415 | 53,705 |
Non-trade receivables and others | 46 | 43 |
Hadong Mineral Fiber Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service purchase | 0 | 0 | 60
Green Biomass Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Woodchip purchase | 0 | 0 | 440
PND solar Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 409 | 407 | 12
Electricity purchase | 5,234 | 557 | 0
Outstanding balances for related party transactions [Abstract] |  |  |
Trade payables | 58 | 0 |
Hyundai Ecoenergy Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 167 | 117 | 0
Electricity purchase | 17,777 | 6,810 | 0
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 16 | 16 |
YeongGwang Yaksu Wind Electric Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 77 | 81 | 0
Electricity purchase | 9,151 | 6,511 | 2,437
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 8 | 5 |
Korea Energy Solution Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 7 | 52 | 0
Electricity purchase | 0 | 15 | 0
Gwangbaek Solar Power Investment Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity purchase | 373 |  |
Green Energy Electricity Generation Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 14 |  |
Namjeongsusang Solar Power Operation Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 14 |  |
Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 291 |  |
Muan Solar Park Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 57 |  |
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 24 |  |
Go deok Clean Energy Co., Ltd |  |  |
Outstanding balances for related party transactions [Abstract] |  |  |
Non-trade receivables and others | 1 |  |
Suwon New Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 2,974 | 5,606 | 0
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 2 |  |
Non-trade receivables and others | 712 | 2,939 |
Muan Sunshine Solar Power Plant Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 30 |  |
6 Associates (Overseas) |  |  |
Outstanding balances for related party transactions [Abstract] |  |  |
Non-trade receivables and others | 3,248 | 1,112 |
9 Associates (Overseas) |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 0 |  |
Electricity sales and others | 66,755 | 98,450 | 60,318
Electricity purchase and Others | 0 | 0 | 31
Joint ventures |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 9,853 | 8,608 | 6,740
Service sales | 26,623 | 18,168 | 16,999
Design service | 0 | 0 | 0
Dividend paid | 0 | 0 | 0
Commission | 476 | 504 | 648
Technical fee | 33 | 4 | 3,424
Construction revenue | 14 | 354 | 568
Interest income | 0 | 0 | 0
Interest expense | 0 | 0 | 0
Electricity purchase | 691,707 | 726,884 | 662,290
Purchase of power generation fuel | 0 | 0 | 0
REC purchase | 9,768 | 10,910 | 11,414
Service purchase | 221,604 | 144,787 | 80,088
Rental fee and others | 0 | 0 | 0
Electricity metering service fee | 0 | 0 | 0
Trading fees | 0 | 0 | 0
Woodchip purchase | 0 | 0 | 0
Electricity sales and others | 831,596 | 1,275,279 | 206,054
Electricity purchase and Others | 14,767 | 7,232 | 1,404
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 60,767 | 53,615 | 728
Trade payables | 90,509 | 53,759 | 68,007
Non-trade receivables and others | 44,237 | 34,180 | 10,589
Non-trade payables and others | 151,544 | 158,438 | 18,487
Accrued interest income | 0 | 0 | 0
Derivative assets | 0 | 0 | 0
Derivative liabilities | 0 | 0 | 0
Naepo Green Energy Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 217 | 154 | 160
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 56 | 18 |
Cheongna Energy Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service sales | 13,791 | 9,922 | 11,688
Electricity purchase | 66 | 58,747 | 58
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 1,592 | 1,074 |
Non-trade receivables and others | 1,186 | 0 |
DAYONE Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.) |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service sales | 4,816 | 3,437 | 1,718
Electricity purchase | 1,120 | 2,847 | 3,445
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 57 | 128 |
Trade payables | 10 | 175 |
Non-trade receivables and others | 11,749 | 12,532 |
Non-trade payables and others | 9,119 | 9,178 |
Daegu Green Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 1,285 | 1,151 | 1,022
Electricity purchase | 215,224 | 296,464 | 287,008
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 44 | 113 |
Trade payables | 26,213 | 28,980 |
Non-trade receivables and others | 55 | 1 |
KAPES, Inc. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Commission | 476 | 504 | 648
Service purchase | 219,673 | 142,511 | 77,758
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 2 | 1 |
Non-trade receivables and others | 5,172 | 0 |
Non-trade payables and others | 20,577 | 50,738 |
Honam Wind Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 502 | 657 | 415
Electricity purchase | 4,382 | 5,306 | 7,700
Outstanding balances for related party transactions [Abstract] |  |  |
Trade payables | 216 | 347 |
Non-trade payables and others | 345 | 1,671 |
Jeongam Wind Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 1,213 | 1,198 | 724
Electricity purchase | 5,982 | 0 | 0
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 0 | 165 |
Non-trade receivables and others | 162 |  |
Non-trade payables and others | 692 | 6 |
Korea Power Engineering Service Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service sales | 203 | 348 | 840
Service purchase | 1,594 | 1,774 | 1,765
Outstanding balances for related party transactions [Abstract] |  |  |
Non-trade receivables and others | 43 | 74 |
Seokmun Energy Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service sales | 1,932 | 1,495 | 1,897
Electricity purchase | 33,164 | 26,370 | 31,759
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 62 | 51 |
Trade payables | 4,898 |  |
Non-trade receivables and others | 9,460 | 136 |
Non-trade payables and others | 9,559 | 4,750 |
Incheon New Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Construction revenue | 14 | 354 | 568
Chun-cheon Energy Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 2,657 | 2,397 | 2,471
Electricity purchase | 222,069 | 313,471 | 320,954
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 98 | 260 |
Trade payables | 27,428 | 23,438 |
Non-trade receivables and others | 165 | 5,362 |
Yeonggwangbaeksu Wind Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 1,788 | 1,744 | 1,540
Electricity purchase | 11,232 | 11,739 | 11,366
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 8 | 6 |
Trade payables | 405 | 671 |
Non-trade receivables and others | 159 | 157 |
Non-trade payables and others | 1,747 | 1,526 |
Yeonggwang Wind Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 793 | 705 | 46
Electricity purchase | 24,103 | 11,940 | 0
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 12 | 10 |
Trade payables | 886 |  |
Non-trade receivables and others | 54 | 54 |
Non-trade payables and others | 3,038 | 2,432 |
Sam-Yang Photovoltaic Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 33 |  |
Electricity purchase | 3,848 |  |
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 5 |  |
Non-trade payables and others | 625 |  |
NH-Amundi Global Infrastructure Investment Private Investment Trust 21 |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service sales | 1,388 |  |
KW Nuclear Components Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service sales | 1,639 | 721 | 839
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 4 | 4 |
Non-trade receivables and others | 0 | 15 |
KEPCO-Uhde Inc. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 8 | 15 | 17
Outstanding balances for related party transactions [Abstract] |  |  |
Non-trade payables and others | 0 | 9 |
Busan Shinho Solar Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 353 | 452 | 362
REC purchase | 7,296 | 7,843 | 7,901
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 2 | 2 |
Trade payables | 135 | 148 |
Non-trade payables and others | 780 | 733 |
Global Trade Of Power System Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service purchase | 337 | 502 | 565
Expressway Solar-light Power Generation Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
REC purchase | 2,472 | 3,067 | 3,513
Daesan Green Energy Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 703 | 39 | 0
Electricity purchase | 104,854 | 0 | 0
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 11 | 6 |
Trade payables | 7,694 | 0 |
Non-trade receivables and others | 216 | 0 |
Taebaek Gadeoksan Wind Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 3 |  |
Outstanding balances for related party transactions [Abstract] |  |  |
Trade payables | 2,473 |  |
Non-trade receivables and others | 5 |  |
Non-trade payables and others | 5 |  |
Cheong-Song Noraesan Wind Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 29 | 6 | 0
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 2 | 1 |
Saemangeum Solar Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service sales | 2,846 | 2,230 | 0
Outstanding balances for related party transactions [Abstract] |  |  |
Non-trade receivables and others | 3,141 | 2,197 |
Jaeun Resident Wind Power Plant Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 0 | 105 | 0
Dangjin Eco Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 33 | 4 | 3,424
Electricity purchase | 3,953 | 0 | 0
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 3 | 2 |
Trade payables | 326 | 0 |
Bitsolar Energy Co., Ltd., |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 42 |  |
Busan Industrial Solar Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity purchase | 19 |  |
Outstanding balances for related party transactions [Abstract] |  |  |
Trade payables | 1 |  |
Haemodum Solar Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 4 |  |
Electricity purchase | 967 |  |
Yeongam Solar Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 165 |  |
Electricity purchase | 32,208 |  |
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 26 |  |
Trade payables | 14,652 |  |
Solaseado Solar Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 66 |  |
Electricity purchase | 28,516 |  |
29 Joint ventures (Overseas) |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales and others | 831,596 | 1,275,279 | 206,054
Electricity purchase and Others | 14,767 | 7,232 | 1,404
15 Joint ventures (Overseas) |  |  |
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 58,839 | 51,700 |
Non-trade receivables and others | 17,217 | 13,652 |
Non-trade payables and others | 105,682 | 87,395 |
Other related parties |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 4,248 | 3,948 | 3,524
Service sales | 5,819 | 0 | 1,230
Design service | 0 | 0 | 0
Dividend paid | 17 | 20 | 166,876
Commission | 0 | 0 | 0
Technical fee | 0 | 0 | 0
Construction revenue | 0 | 0 | 0
Interest income | 3,461 | 2,091 | 4,438
Interest expense | 3,872 | 4,063 | 5,043
Electricity purchase | 0 | 0 | 0
Purchase of power generation fuel | 0 | 0 | 0
REC purchase | 0 | 0 | 4,019
Service purchase | 0 | 0 | 63
Rental fee and others | 0 | 0 | 0
Electricity metering service fee | 0 | 0 | 0
Trading fees | 0 | 0 | 0
Woodchip purchase | 0 | 0 | 0
Electricity sales and others | 0 | 0 | 0
Electricity purchase and Others | 0 | 0 | 0
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 0 | 0 | 0
Trade payables | 0 | 0 | 0
Non-trade receivables and others | 206,916 | 146,416 | 12,125
Non-trade payables and others | 123 | 152 | 218
Accrued interest income | 51 | 1,630 | 1,147
Derivative assets | 20,167 | 41,368 | 27,306
Derivative liabilities | 20,001 | 6,531 | 18,095
Yeongwol Energy Station Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service sales | 0 | 0 | 373
REC purchase | 0 | 0 | 4,019
DS POWER Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service sales | 0 | 0 | 565
Ulleungdo Natural Energy Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service sales | 0 | 0 | 292
Service purchase | 0 | 0 | 63
Korea Development Bank |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 4,248 | 3,948 | 3,524
Dividend paid | 17 | 20 | 166,876
Interest income | 3,461 | 2,091 | 4,438
Interest expense | 3,872 | 4,063 | ₩ 5,043
Outstanding balances for related party transactions [Abstract] |  |  |
Non-trade receivables and others | 206,916 | 146,416 |
Non-trade payables and others | 123 | 152 |
Accrued interest income | 51 | 1,630 |
Derivative assets | 20,167 | 41,368 |
Derivative liabilities | ₩ 20,001 | ₩ 6,531 |

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