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Related Parties - Summary of Transactions Between Related Parties (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dongducheon Dream Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales ₩ 8,942 ₩ 19,923 ₩ 7,757
Electricity purchase 2,244,332 750,148 552,692
Outstanding balances for related party transactions [abstract]      
Trade receivables 592 6,282  
Trade payables 293,256 114,613  
Non-trade receivables and others 270 493  
Saemangeum Sebit Power Plant Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 1,418 0 0
Electricity purchase 23,159 0 0
Outstanding balances for related party transactions [abstract]      
Non-trade receivables and others 653 0  
Korea Gas Corporation      
Disclosure of transactions between related parties [line items]      
Electricity sales 155,309 96,362 97,685
Fuel purchase 11,996,402 5,646,713 3,270,972
Outstanding balances for related party transactions [abstract]      
Trade receivables [1] 12,415 10,015  
Trade payables [1] 1,882,607 800,509  
Non-trade receivables and others [1] 54,232 187  
Non-trade payables and others [1] 1,294 759  
Daejung Offshore Wind Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 46 46 32
Outstanding balances for related party transactions [abstract]      
Non-trade receivables and others 123 77  
Daegu Photovoltaic Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 268 207 325
Electricity purchase 4,744 3,532 3,313
Outstanding balances for related party transactions [abstract]      
Trade payables 135 115  
Non-trade payables and others 2 0  
Haeng Bok Do Si Photovoltaic Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 2 2 2
Electricity purchase 563 393 370
Korea Electric Power Industrial Development Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Service 10,369 11,208 10,833
Service 251,468 241,925 212,366
Outstanding balances for related party transactions [abstract]      
Trade receivables 164 269  
Trade payables 150 873  
Non-trade receivables and others 2 15  
Non-trade payables and others 9,588 5,880  
Goseong Green Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Fuel sales 1,062,108 514,470 47,701
Electricity purchase 1,905,502 987,540 0
Outstanding balances for related party transactions [abstract]      
Trade receivables 76,254 495  
Trade payables 182,095 218,627  
Non-trade receivables and others 14 76,855  
Non-trade payables and others 52,515 59,987  
Gangneung Eco Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Fuel sales 459,404 14,200 10,178
Outstanding balances for related party transactions [abstract]      
Trade receivables 19,364 826  
Non-trade receivables and others 478 465  
Non-trade payables and others 94 97  
Shin Pyeongtaek Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 27,486 23,501 20,791
Electricity purchase 957,294 653,306 520,737
Outstanding balances for related party transactions [abstract]      
Trade receivables 7,375 1,788  
Trade payables 109,274 79,828  
Non-trade receivables and others 1,068 3,116  
Non-trade payables and others 101 99  
Noeul Green Energy Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 9,396 30 30
Electricity purchase 14,176 10,014 10,634
Outstanding balances for related party transactions [abstract]      
Trade receivables 3 3  
Non-trade receivables and others 9,365 1,169  
Non-trade payables and others 2,468 0  
Samcheok Eco Materials Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 546 620 700
Electricity purchase 12,019 13,612 10,713
Outstanding balances for related party transactions [abstract]      
Trade receivables 46 52  
YTN Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 2,180 1,922 1,805
Electricity purchase 304 388 353
Outstanding balances for related party transactions [abstract]      
Trade receivables 112 99  
Busan Green Energy Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 5,055 49 34
Electricity purchase 26,219 18,996 18,678
Outstanding balances for related party transactions [abstract]      
Trade receivables 1 1  
Non-trade receivables and others 26,681 20,658  
Non-trade payables and others 4,415 0  
Gunsan Bio Energy Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 0 20 102
Outstanding balances for related party transactions [abstract]      
Non-trade receivables and others 11,728 11,728  
Korea Electric Vehicle Charging Service      
Disclosure of transactions between related parties [line items]      
Electricity sales [2] 3,686 3,039 1,956
Electricity purchase [2] 0 393 581
Outstanding balances for related party transactions [abstract]      
Trade receivables [2] 0 193  
Non-trade receivables and others [2] 0 120  
YaksuESS Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity purchase 851 1,715 217
Outstanding balances for related party transactions [abstract]      
Trade payables 0 1,374  
Gangwon Wind Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 1,549 1,865 2,109
Electricity purchase 40,130 19,623 23,350
Outstanding balances for related party transactions [abstract]      
Trade receivables 6 8  
Trade payables 5,197 4,293  
Gwangyang Green Energy Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 1,848 486 23
Outstanding balances for related party transactions [abstract]      
Non-trade receivables and others 1,436 532  
Bigeum Resident Photovoltaic Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 660 755 85
Outstanding balances for related party transactions [abstract]      
Trade receivables 343 922  
Non-trade receivables and others 516 0  
Hyundai Green Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales and design service 7,063 11,934 17,257
Outstanding balances for related party transactions [abstract]      
Trade receivables 839 229  
Korea Power Exchange      
Disclosure of transactions between related parties [line items]      
Service 16,596 39,796 25,919
Service 93,817 86,716 87,361
Outstanding balances for related party transactions [abstract]      
Trade receivables 223 627  
Non-trade receivables and others 0 1,300  
Non-trade payables and others 2,405 2,189  
Taebaek Wind Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Service 861 44 226
Service and REC 7,442 5,930 4,003
Outstanding balances for related party transactions [abstract]      
Trade payables 680 560  
Non-trade payables and others 178 262  
Taebaek Guinemi Wind Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 0 26 37
Electricity purchase 6,793 5,910 5,023
Outstanding balances for related party transactions [abstract]      
Trade payables 885 670  
Pyeongchang Wind Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 1,323 1,180 2,064
Design service and others 3,884 4,099 3,969
Outstanding balances for related party transactions [abstract]      
Trade receivables 3 4  
Non-trade payables and others 211 0  
Daeryun Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 2,016 1,944 1,947
Electricity purchase 428,534 157,234 99,523
Outstanding balances for related party transactions [abstract]      
Trade receivables 195 213  
Trade payables 55,725 21,362  
Changjuk Wind Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales [3] 1,350 463 2,067
Electricity purchase [3] 9,027 6,213 6,084
Outstanding balances for related party transactions [abstract]      
Trade payables [3] 0 724  
Non-trade payables and others [3] 0 295  
GS Donghae Electric Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 5,238 21,127 31,557
Electricity purchase 1,035,263 760,377 660,351
Outstanding balances for related party transactions [abstract]      
Trade receivables [4] 872 383  
Trade payables [4] 72,947 113,529  
Non-trade receivables and others [4] 1,558 272  
Non-trade payables and others [4] 14,565 17  
KNH Solar Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 13 14 16
Electricity purchase 4,348 3,222 3,564
Outstanding balances for related party transactions [abstract]      
Trade receivables 1 1  
S-Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Service 4,588 5,229 6,682
Service 1,091,741 608,530 293,515
Outstanding balances for related party transactions [abstract]      
Trade receivables 77 82  
Trade payables 135,504 91,277  
Non-trade receivables and others 44 48  
Non-trade payables and others 11 0  
Chuncheon Green Energy Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 2 0 0
PND Solar Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 427 416 409
Electricity purchase 6,173 5,502 5,234
Outstanding balances for related party transactions [abstract]      
Trade payables 210 0  
Hyundai Eco Energy Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 277 187 167
Electricity purchase 29,209 25,762 17,777
Outstanding balances for related party transactions [abstract]      
Trade receivables 22 19  
Trade payables 738 732  
YeongGwang Yaksu Wind Electric Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 66 78 77
Electricity purchase 7,382 11,729 9,151
Outstanding balances for related party transactions [abstract]      
Trade receivables 7 6  
Trade payables 589 0  
Non-trade payables and others 2,050 0  
Korea Energy Solutions Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 2 2 7
Electricity purchase 102 0 0
Outstanding balances for related party transactions [abstract]      
Non-trade payables and others 94 0  
Gwangbaek Solar Power Investment Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity purchase 602 742 373
Outstanding balances for related party transactions [abstract]      
Non-trade payables and others 61 0  
Green Energy Electricity Generation Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity purchase 2,962 1,238 0
Namjeongsusang Solar Power Operation Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 21 22 14
Electricity purchase 9,491 14,286 0
Outstanding balances for related party transactions [abstract]      
Trade receivables 2 0  
Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1      
Disclosure of transactions between related parties [line items]      
Service 394 399 291
Muan Solar Park Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 950 232 57
REC and others 17,052 31,017 0
Outstanding balances for related party transactions [abstract]      
Trade receivables 25 0  
Non-trade receivables and others 9 23  
Suwon New Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 118 1,820 2,974
Outstanding balances for related party transactions [abstract]      
Non-trade receivables and others 1,280 1,198  
Muan Sunshine Solar Power Plant Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 17 52 30
Electricity purchase 19,514 15,900 0
Outstanding balances for related party transactions [abstract]      
Trade payables 3,076 1,748  
Non-trade payables and others 1,265 0  
Energy Infra Asset Management Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 0 4,629 0
Service 2,779 2,657 0
Taebaek Gadeoksan Wind Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 1,952 295 0
Electricity purchase 25,880 16,360 0
Outstanding balances for related party transactions [abstract]      
Trade payables 12,739 8,397  
Non-trade receivables and others 97 119  
Non-trade payables and others 5 1,571  
ITR Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Service 6 3 0
Structure test network Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Service 7 5 0
Bitgoel Eco Energy Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 1,397 282 0
Service and others 930 0 0
Outstanding balances for related party transactions [abstract]      
Non-trade receivables and others 6 27  
Non-trade payables and others 1,023 0  
Anjwa Smart Farm & Solar City Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 1,068 624 0
Electricity purchase 16,942 24,601 0
Outstanding balances for related party transactions [abstract]      
Non-trade payables and others 921 0  
Daewon Green Energy Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 185 155 0
Others 42,651 0 0
Outstanding balances for related party transactions [abstract]      
Trade receivables 1 0  
Trade payables 5,485 0  
Non-trade receivables and others 0 94  
Saemangeum Heemang Photovoltaic Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 5,740 13 0
Electricity purchase 1,039 0 0
Outstanding balances for related party transactions [abstract]      
Non-trade receivables and others 3,435 0  
Non-trade payables and others 1 0  
UD four M Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 2 4 0
Electricity purchase 313 0 0
Dongbu Highway Solar Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 8 5 0
Electricity purchase 3,516 2,605 0
Outstanding balances for related party transactions [abstract]      
Trade receivables 1 1  
Trade payables 2 98  
Non-trade payables and others 2 90  
Seobu Highway Solar Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 8 8 0
Electricity purchase 3,452 2,936 0
Outstanding balances for related party transactions [abstract]      
Trade receivables 1 0  
Trade payables 8 177  
Non-trade payables and others 3 105  
SureDataLab Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 1 1 0
Hankook Electric Power Information Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 0 1 0
Kosture Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 5 1 0
Outstanding balances for related party transactions [abstract]      
Trade receivables 6 1  
Goesan Solar park Co., Ltd      
Disclosure of transactions between related parties [line items]      
Electricity purchase 7,642 6,209 0
Outstanding balances for related party transactions [abstract]      
Trade payables 346 73  
Jeju Gimnyeong Wind Power Co., Ltd      
Disclosure of transactions between related parties [line items]      
Electricity purchase 12,364 12,833 0
Outstanding balances for related party transactions [abstract]      
Trade payables 1,758 885  
Non-trade receivables and others 130 0  
Seoroseoro Sunny Power Plant Co Ltd      
Disclosure of transactions between related parties [line items]      
Electricity sales 1 0 0
REC and others 1,138 217 0
YuDang Solar Co., Ltd      
Disclosure of transactions between related parties [line items]      
Electricity sales 160 0 0
REC and others 1,915 3,495 0
Jeju Gimnyeong Wind Power Co., Ltd. [Member]      
Disclosure of transactions between related parties [line items]      
Electricity sales 367 0 0
PlatformN. Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Others 14 0 0
Others 475 0 0
Outstanding balances for related party transactions [abstract]      
Non-trade payables and others 232 0  
Gangneung Sacheon Fuel Cell Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 151 0 0
12 Associates (Overseas)      
Disclosure of transactions between related parties [line items]      
Electricity sales 548,507 125,723 66,755
Electricity purchase 101,790 502 0
G.GURU Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity purchase 452 0 0
Tronix Co., Ltd.      
Outstanding balances for related party transactions [abstract]      
Non-trade receivables and others 1 0  
8 Associates (Overseas)      
Outstanding balances for related party transactions [abstract]      
Trade receivables 93 0  
Non-trade receivables and others 49,409 3,196  
Non-trade payables and others 502 502  
Naepo Green Energy Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 761 467 217
Outstanding balances for related party transactions [abstract]      
Trade receivables 169 42  
Non-trade payables and others 3 0  
Cheongna Energy Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Others 39,802 16,469 13,791
Service 80 57 66
Outstanding balances for related party transactions [abstract]      
Trade receivables 17,324 4,164  
Non-trade receivables and others 1,654 1,350  
Non-trade payables and others 1 1  
Dayone Energy Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Service 7,761 8,159 4,816
Service 13,872 5,409 1,120
Outstanding balances for related party transactions [abstract]      
Trade receivables 79 52  
Trade payables 1,027 1,009  
Non-trade receivables and others 10,218 13,297  
Non-trade payables and others 9,119 11,306  
Daegu Green Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 1,190 1,053 1,285
Electricity purchase 508,601 289,052 215,224
Outstanding balances for related party transactions [abstract]      
Trade receivables 53 71  
Trade payables 66,715 35,766  
Non-trade receivables and others 56 55  
KAPES, Inc.      
Disclosure of transactions between related parties [line items]      
Commission 450 413 476
Commission 9,306 64,140 219,673
Outstanding balances for related party transactions [abstract]      
Trade receivables 2 2  
Non-trade payables and others 106 2,121  
Honam Wind Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 242 71 502
Electricity purchase 7,662 4,807 4,382
Outstanding balances for related party transactions [abstract]      
Trade payables 515 575  
Jeongam Wind Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity purchase 0 3,145 5,982
Electricity sales and others 0 588 1,213
Korea Power Engineering Service Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Service 268 339 203
Service 830 1,315 1,594
Outstanding balances for related party transactions [abstract]      
Non-trade receivables and others 47 48  
Non-trade payables and others 77 0  
Seokmun Energy Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Service 1,685 1,701 1,932
Service 60,799 44,315 33,164
Outstanding balances for related party transactions [abstract]      
Trade receivables 67 34  
Trade payables 7,000 7,941  
Non-trade receivables and others 113 149  
Incheon New Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Construction revenue 14 14 14
Chun-cheon Energy Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 2,505 2,329 2,657
Electricity purchase 585,689 327,536 222,069
Outstanding balances for related party transactions [abstract]      
Trade receivables 124 126  
Trade payables 79,117 41,410  
Non-trade receivables and others 165 167  
Yeonggwangbaeksu Wind Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 1,898 1,836 1,788
Electricity purchase 13,990 9,471 11,232
Outstanding balances for related party transactions [abstract]      
Trade receivables 8 6  
Trade payables 1,076 1,099  
Non-trade receivables and others 166 53  
Yeonggwang Wind Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 871 818 793
Electricity purchase 31,221 21,004 24,103
Outstanding balances for related party transactions [abstract]      
Trade receivables 12 10  
Trade payables 2,251 730  
Non-trade receivables and others 62 59  
NH-Amundi Global Infrastructure Investment Private Investment Trust 21      
Disclosure of transactions between related parties [line items]      
Service 1,415 1,727 1,388
KW Nuclear Components Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Service 1,624 2,598 1,639
Service 9,504 96 0
KEPCO-Uhde Inc.      
Disclosure of transactions between related parties [line items]      
Electricity sales 12 10 8
Outstanding balances for related party transactions [abstract]      
Non-trade payables and others 10 10  
Busan Shinho Solar Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 502 376 353
Electricity purchase 10,601 7,895 7,296
Outstanding balances for related party transactions [abstract]      
Trade receivables 3 2  
Trade payables 304 281  
Global Trade Of Power System Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Service 715 323 337
Outstanding balances for related party transactions [abstract]      
Non-trade payables and others 0 7  
Expressway Solar-light Power Generation Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity purchase 4,016 3,146 2,472
Outstanding balances for related party transactions [abstract]      
Trade payables 166 102  
Daesan Green Energy Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 394 523 703
Electricity purchase 129,736 146,776 104,854
Outstanding balances for related party transactions [abstract]      
Trade receivables 18 11  
Trade payables 4,946 5,120  
Non-trade receivables and others 218 120  
Cheong-Song Noraesan Wind Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 698 30 29
Electricity purchase 980 0 0
Outstanding balances for related party transactions [abstract]      
Trade receivables 2 2  
Saemangeum Solar Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Service 100 1,141 2,846
Electricity purchase 1 5 0
Outstanding balances for related party transactions [abstract]      
Non-trade receivables and others 4,368 4,268  
Dangjin Eco Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 32 32 33
Electricity purchase 5,696 4,139 3,953
Outstanding balances for related party transactions [abstract]      
Trade receivables 3 3  
Trade payables 222 276  
Non-trade payables and others 105 0  
Bitsolar Energy Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 498 296 42
Electricity purchase 13,030 5,703 0
Outstanding balances for related party transactions [abstract]      
Trade payables 201    
Non-trade receivables and others 222 7  
Non-trade payables and others 0 54  
Busan Industrial Solar Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity purchase 4,575 2,815 19
Haemodum Solar Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 42 6 4
Electricity purchase 2,168 1,625 967
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 379 339 165
Electricity purchase 44,745 47,805 32,208
Outstanding balances for related party transactions [abstract]      
Trade receivables 44 29  
Trade payables 3,655 3,324  
Solaseado Solar Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 1,851 2,890 66
Electricity purchase 28,698 31,031 28,516
Outstanding balances for related party transactions [abstract]      
Non-trade receivables and others 23 0  
Non-trade payables and others 2,911 0  
Chungsongmeon BongSan wind power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 1 1 0
Busan Industrial Solar Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 14 9 0
Outstanding balances for related party transactions [abstract]      
Trade receivables 2 1  
Trade payables 0 54  
Non-trade receivables and others 0 24  
Omisan Wind Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 1 1 0
Electricity purchase 0 7 0
KW Nuclear Components Co., Ltd      
Outstanding balances for related party transactions [abstract]      
Trade receivables 4 0  
Non-trade receivables and others 18 0  
Samsu Wind Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity purchase 10,605 2,800 0
Outstanding balances for related party transactions [abstract]      
Trade payables 1,303 1,300  
Seobusambo highway photovoltaics Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 3 0 0
Electricity purchase 103 0 0
Prime Swedish Holding AB [Member]      
Disclosure of transactions between related parties [line items]      
Electricity sales 284 0 0
Western Power Changgi Solar Co., Ltd. (formerly, Sam-Yang Photovoltaic Power Co., Ltd.)      
Disclosure of transactions between related parties [line items]      
Electricity sales [3] 0 1,920 33
Electricity purchase [3] 0 5,852 3,848
Outstanding balances for related party transactions [abstract]      
Trade receivables [3] 0 5  
Goheung New Energy Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 141 0 0
Gunsan Land Solar Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 518 0 0
Electricity purchase 533 0  
Outstanding balances for related party transactions [abstract]      
Non-trade receivables and others 138 0  
Hapcheon Floating Photovoltaic Power Plant Inc. [Member]      
Disclosure of transactions between related parties [line items]      
Electricity sales 544 0 0
Service and REC 2,526 0 0
Outstanding balances for related party transactions [abstract]      
Trade receivables 9 0  
Cheongju Eco Park Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 204 0 0
Electricity purchase 94,409 0  
Outstanding balances for related party transactions [abstract]      
Trade payables 7,994 0  
Enel X Midland Photovoltaic, LLC      
Disclosure of transactions between related parties [line items]      
Electricity sales 12 0 0
Electricity purchase 1,871 0  
Outstanding balances for related party transactions [abstract]      
Trade receivables 1 0  
Trade payables 3 0  
Eumseong Eco Park Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 2 0 0
37 Joint ventures (Overseas)      
Disclosure of transactions between related parties [line items]      
Electricity sales 606,513 773,291 831,596
Electricity purchase 16,859 54,135 14,767
Energyco Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 463 1 0
Electricity purchase 7,898 0  
Geumsungsan Wind Power Co., Ltd.      
Disclosure of transactions between related parties [line items]      
Electricity sales 7 0 0
Outstanding balances for related party transactions [abstract]      
Trade receivables 3 0  
Non-trade payables and others 1 0  
22 Joint ventures (Overseas)      
Outstanding balances for related party transactions [abstract]      
Trade receivables 73,805 84,150  
Non-trade receivables and others 71,661 26,060  
Non-trade payables and others 117,754 22,050  
Korea Development Bank      
Disclosure of transactions between related parties [line items]      
Electricity sales 4,134 4,177 4,248
Dividends paid 12 256,862 17
Interest income 2,222 756 3,461
Interest expense 4,208 2,756 ₩ 3,872
Outstanding balances for related party transactions [abstract]      
Non-trade receivables and others 30,836 420,732  
Non-trade payables and others 101 21,172  
Accrued interest income 5 154  
Derivative assets 67,662 59,139  
Derivative liabilities ₩ 3,759 ₩ 0  
[1] The balance due to the fuel swap with Korea Midland Power Co., Ltd. is included. The total transaction amount is ￦514,405 million on loans and ￦460,903 million on bororrowings.
[2] 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 Group as of December 31, 2022.
[3] Reclassified from a joint venture to a subsidiary during the year ended December 31, 2022. Transactions are made before the reclassification.
[4] The balance due to the fuel swap with Korea Western Power Co., Ltd. and Korea East-West Power Co., Ltd. is included. The total transaction amount is ￦5,590 million on loans and ￦20,113 million on bororrowings.