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Investments in Joint Ventures 3 (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
KEPCO-Uhde Inc.    
Disclosure of joint ventures [line items]    
Total assets ₩ 48 ₩ 128
Total liabilities 15 14
Sales 0 0
Profit (loss) for the year (84) (84)
Shuweihat Asia Power Investment B.V.    
Disclosure of joint ventures [line items]    
Total assets 135,646 75,652
Total liabilities 29 0
Sales 0 0
Profit (loss) for the year (2,660) 23,905
Shuweihat Asia Operation & Maintenance Company    
Disclosure of joint ventures [line items]    
Total assets 3,037 2,586
Total liabilities 71 77
Sales 3,013 2,821
Profit (loss) for the year 2,099 2,002
Waterbury Lake Uranium L.P.    
Disclosure of joint ventures [line items]    
Total assets 66,706 65,240
Total liabilities 117 14
Sales 0 0
Profit (loss) for the year 0 0
ASM-BG Investicii AD    
Disclosure of joint ventures [line items]    
Total assets 72,999 74,977
Total liabilities 43,889 37,593
Sales 16,056 13,161
Profit (loss) for the year 6,230 5,365
RES Technology AD    
Disclosure of joint ventures [line items]    
Total assets 62,345 63,495
Total liabilities 32,079 30,090
Sales 11,205 8,142
Profit (loss) for the year 3,018 2,220
KV Holdings, Inc.    
Disclosure of joint ventures [line items]    
Total assets 24,149 6,318
Total liabilities 1 1
Sales 1 10
Profit (loss) for the year 353 2,405
KEPCO SPC Power Corporation    
Disclosure of joint ventures [line items]    
Total assets 267,904 290,981
Total liabilities 29,082 26,381
Sales 253,145 181,443
Profit (loss) for the year 44,751 49,499
Gansu Datang Yumen Wind Power Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 67,651 75,268
Total liabilities 52,592 58,680
Sales 10,048 9,666
Profit (loss) for the year (1,161) (1,547)
Datang Chifeng Renewable Power Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 835,331 827,213
Total liabilities 355,377 315,746
Sales 140,343 120,989
Profit (loss) for the year 42,889 24,398
Datang KEPCO Chaoyang Renewable Power Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 168,680 198,437
Total liabilities 57,685 87,895
Sales 29,459 29,094
Profit (loss) for the year 4,919 3,905
Rabigh Electricity Company    
Disclosure of joint ventures [line items]    
Total assets 2,520,946 2,410,335
Total liabilities 1,855,836 1,910,203
Sales 322,108 266,822
Profit (loss) for the year 65,550 34,268
Rabigh Operation & Maintenance Company Limited    
Disclosure of joint ventures [line items]    
Total assets 23,664 29,107
Total liabilities 10,882 18,930
Sales 32,572 32,079
Profit (loss) for the year 9,176 9,808
Jamaica Public Service Company Limited    
Disclosure of joint ventures [line items]    
Total assets 2,310,611 2,174,800
Total liabilities 1,515,361 1,469,297
Sales 1,499,897 1,113,943
Profit (loss) for the year 69,458 41,277
KW Nuclear Components Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 40,381 42,033
Total liabilities 2,013 6,678
Sales 16,968 32,938
Profit (loss) for the year 6,755 12,335
Busan Shinho Solar Power Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 36,868 37,016
Total liabilities 9,991 13,653
Sales 10,543 7,918
Profit (loss) for the year 5,424 3,261
Global Trade Of Power System Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 5,628 2,443
Total liabilities 3,222 385
Sales 8,434 6,355
Profit (loss) for the year 351 76
Expressway Solar-light Power Generation Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 14,248 13,747
Total liabilities 4,740 3,113
Sales 3,711 2,637
Profit (loss) for the year 1,654 466
Amman Asia Electric Power Company    
Disclosure of joint ventures [line items]    
Total assets 759,885 731,745
Total liabilities 392,795 433,946
Sales 28,665 17,753
Profit (loss) for the year 39,090 30,815
KAPES, Inc.    
Disclosure of joint ventures [line items]    
Total assets 82,943 92,790
Total liabilities 45,068 59,099
Sales 20,006 87,775
Profit (loss) for the year 3,797 1,571
Honam Wind Power Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 34,028 33,623
Total liabilities 17,522 19,800
Sales 8,781 5,395
Profit (loss) for the year 3,283 531
Korea Power Engineering Service Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 20,931 24,068
Total liabilities 1,817 5,397
Sales 9,176 11,259
Profit (loss) for the year 500 709
Chun-cheon Energy Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 629,202 610,650
Total liabilities 521,212 523,223
Sales 585,223 327,534
Profit (loss) for the year 19,940 (5,451)
Yeonggwangbaeksu Wind Power Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 80,042 82,439
Total liabilities 59,070 64,290
Sales 14,150 8,411
Profit (loss) for the year 2,764 (2,302)
Nghi Son 2 Power LLC    
Disclosure of joint ventures [line items]    
Total assets 3,652,801 2,982,805
Total liabilities 2,835,123 3,020,684
Sales 589,023 548,027
Profit (loss) for the year 102,436 84,276
Kelar S.A    
Disclosure of joint ventures [line items]    
Total assets 689,802 655,236
Total liabilities 514,085 526,063
Sales 107,577 84,504
Profit (loss) for the year 943 3,641
PT. Tanjung Power Indonesia    
Disclosure of joint ventures [line items]    
Total assets 730,239 713,715
Total liabilities 464,791 580,727
Sales 99,169 89,491
Profit (loss) for the year 13,619 14,511
Incheon New Power Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 2,633 3,240
Total liabilities 755 2,606
Sales 4,497 2,336
Profit (loss) for the year 1,244 109
Seokmun Energy Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 212,509 219,414
Total liabilities 152,731 171,682
Sales 61,513 41,555
Profit (loss) for the year 12,064 (3,434)
Daehan Wind Power PSC    
Disclosure of joint ventures [line items]    
Total assets 145,065 137,388
Total liabilities 117,219 127,080
Sales 17,958 6,794
Profit (loss) for the year 5,524 7,581
Barakah One Company    
Disclosure of joint ventures [line items]    
Total assets 33,587,352 29,707,801
Total liabilities 34,422,965 29,951,656
Sales 498,129 253,653
Profit (loss) for the year (444,338) 4,011
Nawah Energy Company    
Disclosure of joint ventures [line items]    
Total assets 338,883 155,191
Total liabilities 337,134 153,559
Sales 395,580 0
Profit (loss) for the year 3 0
Momentum    
Disclosure of joint ventures [line items]    
Total assets 7,315 7,546
Total liabilities 6,280 6,442
Sales 30,864 34,527
Profit (loss) for the year 1,036 1,105
Daegu Green Power Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 551,431 541,304
Total liabilities 459,881 459,536
Sales 516,254 295,645
Profit (loss) for the year 9,364 1,796
Yeonggwang Wind Power Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 233,695 239,701
Total liabilities 189,737 202,410
Sales 31,221 25,892
Profit (loss) for the year 6,700 958
Chester Solar IV SpA    
Disclosure of joint ventures [line items]    
Total assets 12,728 11,966
Total liabilities 12,469 12,144
Sales 1,521 1,344
Profit (loss) for the year (174) (2,060)
Chester Solar V SpA    
Disclosure of joint ventures [line items]    
Total assets 4,364 4,034
Total liabilities 4,315 4,256
Sales 520 440
Profit (loss) for the year 83 (601)
Diego de Almagro Solar SpA    
Disclosure of joint ventures [line items]    
Total assets 15,908 15,155
Total liabilities 14,946 14,572
Sales 1,877 1,615
Profit (loss) for the year (288) (2,103)
South Jamaica Power Company Limited    
Disclosure of joint ventures [line items]    
Total assets 521,558 474,664
Total liabilities 289,359 287,852
Sales 314,064 224,159
Profit (loss) for the year 33,348 5,743
Daesan Green Energy Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 245,826 264,618
Total liabilities 190,918 203,921
Sales 101,689 88,147
Profit (loss) for the year (6,641) (3,310)
RE Holiday Holdings LLC    
Disclosure of joint ventures [line items]    
Total assets 351,243 335,130
Total liabilities 180,503 188,796
Sales 22,671 19,724
Profit (loss) for the year 3,022 10,897
RE Pioneer Holdings LLC    
Disclosure of joint ventures [line items]    
Total assets 263,232 220,390
Total liabilities 152,888 126,361
Sales 15,701 12,925
Profit (loss) for the year 369 9,307
RE Barren Ridge 1 Holdings LLC    
Disclosure of joint ventures [line items]    
Total assets 226,504 201,629
Total liabilities 100,436 87,291
Sales 11,740 10,575
Profit (loss) for the year (903) (541)
RE Astoria 2 LandCo LLC    
Disclosure of joint ventures [line items]    
Total assets 13,517 12,294
Total liabilities 319 298
Sales 1,004 889
Profit (loss) for the year 913 799
RE Barren Ridge LandCo LLC    
Disclosure of joint ventures [line items]    
Total assets 4,761 4,328
Total liabilities 95 89
Sales 389 345
Profit (loss) for the year 357 315
Laurel SpA    
Disclosure of joint ventures [line items]    
Total assets 11,221 10,566
Total liabilities 10,447 10,350
Sales 1,424 1,159
Profit (loss) for the year 54 (1,425)
KIAMCO KOWEPO Bannerton Hold Co Pty Ltd    
Disclosure of joint ventures [line items]    
Total assets 29,517 30,809
Total liabilities 74 1,573
Sales 0 0
Profit (loss) for the year (260) (916)
Chile Solar JV SpA    
Disclosure of joint ventures [line items]    
Total assets 75,246 68,445
Total liabilities 55,609 3,531
Sales 7,842 3,060
Profit (loss) for the year 6,425 1,408
Cheong-Song Noraesan Wind Power Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 55,948 57,047
Total liabilities 41,464 43,106
Sales 7,988 7,929
Profit (loss) for the year 1,916 2,309
Chester Solar I SpA    
Disclosure of joint ventures [line items]    
Total assets 13,246 12,965
Total liabilities 10,933 11,043
Sales 1,094 1,065
Profit (loss) for the year (221) (1,146)
Solar Philippines Calatagan Corporation    
Disclosure of joint ventures [line items]    
Total assets 113,327 117,324
Total liabilities 36,756 46,759
Sales 17,728 19,418
Profit (loss) for the year 10,194 11,782
Saemangeum Solar Power Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 35,890 35,323
Total liabilities 6,817 5,771
Sales 0 0
Profit (loss) for the year (479) (631)
Chungsongmeon BongSan wind power Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 81,030 74,683
Total liabilities 75,207 67,696
Sales 0 0
Profit (loss) for the year (1,120) (1,186)
Jaeun Resident Wind Power Plant Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 89,756 81,477
Total liabilities 82,047 74,724
Sales 0 0
Profit (loss) for the year (190) (1,325)
DE Energia SpA    
Disclosure of joint ventures [line items]    
Total assets 48,350 49,201
Total liabilities 62,481 59,587
Sales 5,959 5,219
Profit (loss) for the year (1,109) (2,954)
Dangjin Eco Power Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 98,714 98,010
Total liabilities 20,721 22,223
Sales 4,185 4,139
Profit (loss) for the year 700 805
Haemodum Solar Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 22,974 23,038
Total liabilities 16,103 16,750
Sales 2,556 1,799
Profit (loss) for the year 581 45
Yangyang Wind Power Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 107,471 53,586
Total liabilities 85,829 31,291
Sales 0 0
Profit (loss) for the year (634) (965)
Horus Solar, S.A. De C.V.    
Disclosure of joint ventures [line items]    
Total assets 156,436 192,650
Total liabilities 133,714 177,514
Sales 5,568 8,392
Profit (loss) for the year 5,628 16,664
Recursos Solares PV De Mexico II, S.A. De C.V.    
Disclosure of joint ventures [line items]    
Total assets 173,262 153,855
Total liabilities 155,009 138,033
Sales 468 0
Profit (loss) for the year 457 4,842
Sunmex Renovables, S.A. De C.V.    
Disclosure of joint ventures [line items]    
Total assets 129,502 90,956
Total liabilities 118,449 80,218
Sales 0 0
Profit (loss) for the year (1,008) (333)
Stavro Holding II A.B.    
Disclosure of joint ventures [line items]    
Total assets 85,883 88,220
Total liabilities 27 87
Sales 0 0
Profit (loss) for the year 61 (276)
Solaseado Solar Power Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 363,492 367,915
Total liabilities 325,262 345,987
Sales 51,198 41,684
Profit (loss) for the year 16,301 4,170
Yeongam Solar Power Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 329,714 324,132
Total liabilities 281,791 292,213
Sales 44,568 37,301
Profit (loss) for the year 8,563 4,930
Samsu Wind Power Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 71,123 69,213
Total liabilities 54,254 54,331
Sales 10,118 3,918
Profit (loss) for the year 1,987 1,162
Pulau Indah Power Plant Sdn. Bhd.    
Disclosure of joint ventures [line items]    
Total assets 760,536 404,458
Total liabilities 675,853 338,635
Sales 797 228
Profit (loss) for the year 6,723 (2,589)
Sam-Yang Photovoltaic Power Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets   50,837
Total liabilities   40,647
Sales   7,376
Profit (loss) for the year   150
NH-Amundi Global Infrastructure Investment Private Investment Trust 21    
Disclosure of joint ventures [line items]    
Total assets 71,851 70,910
Total liabilities 74 38
Sales 4,850 3,428
Profit (loss) for the year 5,431 6,468
Shin-han BNPP Private Investment Trust for East-West Sunlight Dream    
Disclosure of joint ventures [line items]    
Total assets 17,341 18,121
Total liabilities 22 23
Sales 38 333
Profit (loss) for the year (10) 288
PT Barito Wahana Tenaga    
Disclosure of joint ventures [line items]    
Total assets 447,688 266,584
Total liabilities 0 39
Sales 0 0
Profit (loss) for the year 49,471 25,839
Cheongna Energy Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 385,935 357,248
Total liabilities 368,340 338,763
Sales 100,200 77,640
Profit (loss) for the year (889) 12,743
Naepo Green Energy Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 448,309 222,885
Total liabilities 499,528 249,415
Sales 8,905 7,044
Profit (loss) for the year (34,347) (21,392)
Dayone Energy Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 470,677 452,509
Total liabilities 530,304 504,351
Sales 278,363 143,870
Profit (loss) for the year (12,893) 409
OneEnergy Asia Limited    
Disclosure of joint ventures [line items]    
Total assets 1,039,987 136,247
Total liabilities 673,223 777
Sales 0 0
Profit (loss) for the year 16,041 (2,844)
KAS Investment I LLC    
Disclosure of joint ventures [line items]    
Total assets 61,907 52,681
Total liabilities 861 1,583
Sales 1,603 (19,390)
Profit (loss) for the year 6,998 (23,007)
KAS Investment II LLC    
Disclosure of joint ventures [line items]    
Total assets 61,661 52,476
Total liabilities 861 1,581
Sales 1,592 (19,311)
Profit (loss) for the year 6,967 (21,801)
Energyco LLC    
Disclosure of joint ventures [line items]    
Total assets 56,996  
Total liabilities 52,304  
Sales 7,898  
Profit (loss) for the year 2,258  
Energyco Co., Ltd. (formerly, Energyco LLC)    
Disclosure of joint ventures [line items]    
Total assets   59,662
Total liabilities   57,227
Sales   168
Profit (loss) for the year   (2,514)
CAES, LLC    
Disclosure of joint ventures [line items]    
Total assets 49,676 43,089
Total liabilities 6 0
Sales 0 0
Profit (loss) for the year (547) (923)
Hapcheon Floating Photovoltaic Power Plant Inc.    
Disclosure of joint ventures [line items]    
Total assets 78,768 73,978
Total liabilities 61,561 59,832
Sales 12,705 1,120
Profit (loss) for the year 3,061 (972)
Busan Industrial Solar Power Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 21,149 19,085
Total liabilities 18,016 17,937
Sales 3,190 1,879
Profit (loss) for the year 901 566
Bitsolar Energy Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 78,779 80,307
Total liabilities 83,324 85,340
Sales 9,557 8,298
Profit (loss) for the year 261 (1,105)
Pulau Indah O&M Sdn. Bhd.    
Disclosure of joint ventures [line items]    
Total assets 0 0
Total liabilities 0 0
Sales 0 0
Profit (loss) for the year 0 0
Guadalupe Solar SpA    
Disclosure of joint ventures [line items]    
Total assets 10,148 8,774
Total liabilities 8,790 7,839
Sales 924 12
Profit (loss) for the year (43) (1,119)
Omisan Wind Power Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 142,274 128,724
Total liabilities 117,881 103,802
Sales 0 0
Profit (loss) for the year (519) (320)
Foresight Iberian Solar Group Holding, S.L.    
Disclosure of joint ventures [line items]    
Total assets 94,181 90,610
Total liabilities 81,997 79,519
Sales 0 168
Profit (loss) for the year (1,365) (603)
Yeongwol Eco Wind Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 87,856 43,784
Total liabilities 83,281 39,066
Sales 0 0
Profit (loss) for the year (144) 421
Gurae Resident Power Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 11,649 6,932
Total liabilities 10,467 5,734
Sales 0 0
Profit (loss) for the year (19) 42
Cheongju Eco Park Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 152,139 138,657
Total liabilities 116,639 120,485
Sales 66,260 6,454
Profit (loss) for the year 17,319 (1,708)
Enel X Midland Photovoltaic, LLC    
Disclosure of joint ventures [line items]    
Total assets 10,289 9,053
Total liabilities 1,010 611
Sales 1,684 122
Profit (loss) for the year 837 (31)
Geumsungsan Wind Power Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 125,324 66,862
Total liabilities 115,196 47,906
Sales 0 0
Profit (loss) for the year (1,770) (2,146)
KEPCO KPS Carabao Corp.    
Disclosure of joint ventures [line items]    
Total assets 2,025 3,482
Total liabilities 1,582 2,516
Sales 611 5,309
Profit (loss) for the year (327) 733
Prime Swedish Holding AB    
Disclosure of joint ventures [line items]    
Total assets 77,942 34,257
Total liabilities 114 20
Sales 0 0
Profit (loss) for the year (577) (5)
Goheung New Energy Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 136,682 55,145
Total liabilities 113,393 32,125
Sales 0 0
Profit (loss) for the year (1,591) (2,711)
Gunsan Land Solar Co., Ltd.    
Disclosure of joint ventures [line items]    
Total assets 158,371 86,654
Total liabilities 121,785 60,996
Sales 28,828 432
Profit (loss) for the year 12,154 432
Capman Lynx SCA, SICAR    
Disclosure of joint ventures [line items]    
Total assets 112,718 113,658
Total liabilities 102,810 93,706
Sales 504 0
Profit (loss) for the year (16,780) 0
International Offshore Power Transmission Holding Company Limited    
Disclosure of joint ventures [line items]    
Total assets 4,680 5
Total liabilities 71,468 0
Sales 0 0
Profit (loss) for the year (68,093) ₩ 0
Pyeongchang Wind Power Co., Ltd    
Disclosure of joint ventures [line items]    
Total assets 70,599  
Total liabilities 45,661  
Sales 14,524  
Profit (loss) for the year 3,693  
Eumseong Eco Park Co., Ltd    
Disclosure of joint ventures [line items]    
Total assets 136,909  
Total liabilities 119,736  
Sales 0  
Profit (loss) for the year (636)  
Songsan Green Energy Co., Ltd    
Disclosure of joint ventures [line items]    
Total assets 5,500  
Total liabilities 0  
Sales 0  
Profit (loss) for the year (69)  
Changwon Nu-ri Energy Co., Ltd    
Disclosure of joint ventures [line items]    
Total assets 1,490  
Total liabilities 0  
Sales 0  
Profit (loss) for the year (10)  
Hasami Wind Farm Corporation    
Disclosure of joint ventures [line items]    
Total assets 3,100  
Total liabilities 0  
Sales 0  
Profit (loss) for the year (23)  
PungBack Wind Farm Corporation    
Disclosure of joint ventures [line items]    
Total assets 46,957  
Total liabilities 31,667  
Sales 0  
Profit (loss) for the year (3,089)  
Trumbull Asset Management, LLC    
Disclosure of joint ventures [line items]    
Total assets 316  
Total liabilities 0  
Sales 656  
Profit (loss) for the year 323  
S-Power Chile SpA    
Disclosure of joint ventures [line items]    
Total assets 2,430  
Total liabilities 2,450  
Sales 1,334  
Profit (loss) for the year 22  
Seungmun Green Energy    
Disclosure of joint ventures [line items]    
Total assets 46,283  
Total liabilities 18,843  
Sales 0  
Profit (loss) for the year 367  
Seobusambo highway photovoltaics Co., Ltd    
Disclosure of joint ventures [line items]    
Total assets 8,286  
Total liabilities 4,453  
Sales 217  
Profit (loss) for the year ₩ 265