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Investments in Joint Ventures 3 (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of joint ventures [line items]      
Total assets ₩ 239,714,965 ₩ 234,804,994  
Total liabilities 202,450,215 192,804,738  
Sales 87,476,410 70,546,024 ₩ 60,012,375
Profit (loss) for the year (4,716,144) (24,429,108) ₩ (5,215,581)
KEPCO-Uhde Inc.      
Disclosure of joint ventures [line items]      
Total assets   48  
Total liabilities   15  
Sales   0  
Profit (loss) for the year   (84)  
Shuweihat Asia Power Investment B.V.      
Disclosure of joint ventures [line items]      
Total assets 142,680 135,646  
Total liabilities 20 29  
Sales 0 0  
Profit (loss) for the year 897 (2,660)  
Shuweihat Asia Operation & Maintenance Company      
Disclosure of joint ventures [line items]      
Total assets 4,421 3,037  
Total liabilities 1,116 71  
Sales 3,194 3,013  
Profit (loss) for the year 2,249 2,099  
Waterbury Lake Uranium L.P.      
Disclosure of joint ventures [line items]      
Total assets 74,320 66,706  
Total liabilities 550 117  
Sales 0 0  
Profit (loss) for the year 0 0  
ASM-BG Investicii AD      
Disclosure of joint ventures [line items]      
Total assets 68,837 72,999  
Total liabilities 39,359 43,889  
Sales 10,931 16,056  
Profit (loss) for the year 1,359 6,230  
RES Technology AD      
Disclosure of joint ventures [line items]      
Total assets 58,152 62,345  
Total liabilities 29,387 32,079  
Sales 5,969 11,205  
Profit (loss) for the year (1,027) 3,018  
KV Holdings, Inc.      
Disclosure of joint ventures [line items]      
Total assets 12,968 24,149  
Total liabilities 2 1  
Sales 20 1  
Profit (loss) for the year 367 353  
KEPCO SPC Power Corporation      
Disclosure of joint ventures [line items]      
Total assets 288,140 267,904  
Total liabilities 26,778 29,082  
Sales 222,773 253,145  
Profit (loss) for the year 17,270 44,751  
Gansu Datang Yumen Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 61,657 67,651  
Total liabilities 45,869 52,592  
Sales 10,684 10,048  
Profit (loss) for the year 791 (1,161)  
Datang Chifeng Renewable Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 812,124 835,331  
Total liabilities 345,277 355,377  
Sales 117,833 140,343  
Profit (loss) for the year 25,055 42,889  
Datang KEPCO Chaoyang Renewable Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 166,959 168,680  
Total liabilities 58,942 57,685  
Sales 23,638 29,459  
Profit (loss) for the year 1,597 4,919  
Rabigh Electricity Company      
Disclosure of joint ventures [line items]      
Total assets 2,556,848 2,520,946  
Total liabilities 1,855,234 1,855,836  
Sales 304,727 322,108  
Profit (loss) for the year 51,539 65,550  
Rabigh Operation & Maintenance Company Limited      
Disclosure of joint ventures [line items]      
Total assets 40,339 23,664  
Total liabilities 27,928 10,882  
Sales 31,301 32,572  
Profit (loss) for the year 6,676 9,176  
Jamaica Public Service Company Limited      
Disclosure of joint ventures [line items]      
Total assets 2,332,019 2,310,611  
Total liabilities 1,491,199 1,515,361  
Sales 1,400,582 1,499,897  
Profit (loss) for the year 87,307 69,458  
KW Nuclear Components Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 42,363 40,381  
Total liabilities 460 2,013  
Sales 14,344 16,968  
Profit (loss) for the year 5,386 6,755  
Busan Shinho Solar Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 31,863 36,868  
Total liabilities 5,188 9,991  
Sales 9,197 10,543  
Profit (loss) for the year 4,473 5,424  
Global Trade Of Power System Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 2,398 5,628  
Total liabilities 277 3,222  
Sales 2,044 8,434  
Profit (loss) for the year (229) 351  
Expressway Solar-light Power Generation Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 13,065 14,248  
Total liabilities 2,691 4,740  
Sales 3,397 3,711  
Profit (loss) for the year 892 1,654  
Amman Asia Electric Power Company      
Disclosure of joint ventures [line items]      
Total assets 719,388 759,885  
Total liabilities 347,015 392,795  
Sales 21,772 28,665  
Profit (loss) for the year 33,811 39,090  
KAPES, Inc.      
Disclosure of joint ventures [line items]      
Total assets 203,066 82,943  
Total liabilities 165,475 45,068  
Sales 32,294 20,006  
Profit (loss) for the year 2,150 3,797  
Honam Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 31,183 34,028  
Total liabilities 14,938 17,522  
Sales 6,570 8,781  
Profit (loss) for the year 1,540 3,283  
Korea Power Engineering Service Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 21,534 20,931  
Total liabilities 1,853 1,817  
Sales 11,248 9,176  
Profit (loss) for the year 1,203 500  
Chun-cheon Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 565,972 629,202  
Total liabilities 447,820 521,212  
Sales 502,889 585,641  
Profit (loss) for the year 10,435 19,940  
Yeonggwangbaeksu Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 73,854 80,042  
Total liabilities 50,936 59,070  
Sales 13,523 14,150  
Profit (loss) for the year 1,944 2,764  
Nghi Son 2 Power LLC      
Disclosure of joint ventures [line items]      
Total assets 3,775,717 3,652,801  
Total liabilities 2,939,740 2,835,123  
Sales 825,701 589,023  
Profit (loss) for the year 33,505 102,436  
Kelar S.A      
Disclosure of joint ventures [line items]      
Total assets 691,104 689,802  
Total liabilities 493,325 514,085  
Sales 112,201 107,577  
Profit (loss) for the year 12,488 943  
PT. Tanjung Power Indonesia      
Disclosure of joint ventures [line items]      
Total assets 704,274 730,239  
Total liabilities 446,700 464,791  
Sales 111,138 99,169  
Profit (loss) for the year 21,854 13,619  
Incheon New Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 1,404 2,633  
Total liabilities 377 755  
Sales 3,781 4,497  
Profit (loss) for the year 485 1,244  
Seokmun Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 201,776 212,509  
Total liabilities 144,565 152,731  
Sales 54,575 61,513  
Profit (loss) for the year (1,581) 12,064  
Daehan Wind Power PSC      
Disclosure of joint ventures [line items]      
Total assets 144,260 145,065  
Total liabilities 111,407 117,219  
Sales 17,880 17,958  
Profit (loss) for the year 4,951 5,524  
Barakah One Company      
Disclosure of joint ventures [line items]      
Total assets 35,586,640 33,587,352  
Total liabilities 36,901,367 34,422,965  
Sales 1,243,735 498,129  
Profit (loss) for the year (230,503) (444,338)  
Nawah Energy Company      
Disclosure of joint ventures [line items]      
Total assets 569,982 338,883  
Total liabilities 568,147 337,134  
Sales 555,338 395,580  
Profit (loss) for the year 34 3  
Momentum      
Disclosure of joint ventures [line items]      
Total assets 13,449 7,315  
Total liabilities 12,821 6,280  
Sales 23,160 30,864  
Profit (loss) for the year 624 1,036  
Daegu Green Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 515,354 551,431  
Total liabilities 429,204 459,881  
Sales 380,130 516,254  
Profit (loss) for the year (5,146) 9,364  
Yeonggwang Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 225,286 233,695  
Total liabilities 175,530 189,737  
Sales 36,326 31,221  
Profit (loss) for the year 11,672 6,700  
Chester Solar IV SpA      
Disclosure of joint ventures [line items]      
Total assets 12,435 12,728  
Total liabilities 11,504 12,469  
Sales 2,119 1,521  
Profit (loss) for the year 395 (174)  
Chester Solar V SpA      
Disclosure of joint ventures [line items]      
Total assets 4,124 4,364  
Total liabilities 4,002 4,315  
Sales 696 520  
Profit (loss) for the year 141 83  
Diego de Almagro Solar SpA      
Disclosure of joint ventures [line items]      
Total assets 15,785 15,908  
Total liabilities 13,907 14,946  
Sales 3,114 1,877  
Profit (loss) for the year 931 (288)  
South Jamaica Power Company Limited      
Disclosure of joint ventures [line items]      
Total assets 482,866 521,558  
Total liabilities 267,307 289,359  
Sales 240,664 314,064  
Profit (loss) for the year 18,833 33,348  
Daesan Green Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 237,663 245,826  
Total liabilities 174,261 190,918  
Sales 111,225 101,689  
Profit (loss) for the year 11,480 (6,641)  
RE Holiday Holdings LLC      
Disclosure of joint ventures [line items]      
Total assets 340,773 351,243  
Total liabilities 172,589 180,503  
Sales 21,178 22,671  
Profit (loss) for the year 664 3,022  
RE Pioneer Holdings LLC      
Disclosure of joint ventures [line items]      
Total assets 257,091 263,232  
Total liabilities 148,929 152,888  
Sales 14,136 15,701  
Profit (loss) for the year (2,164) 369  
RE Barren Ridge 1 Holdings LLC      
Disclosure of joint ventures [line items]      
Total assets 213,491 226,504  
Total liabilities 97,184 100,436  
Sales 11,915 11,740  
Profit (loss) for the year (1,979) (903)  
RE Astoria 2 LandCo LLC      
Disclosure of joint ventures [line items]      
Total assets 14,116 13,517  
Total liabilities 242 319  
Sales 1,014 1,004  
Profit (loss) for the year 823 913  
RE Barren Ridge LandCo LLC      
Disclosure of joint ventures [line items]      
Total assets 4,980 4,761  
Total liabilities 97 95  
Sales 393 389  
Profit (loss) for the year 329 357  
Laurel SpA      
Disclosure of joint ventures [line items]      
Total assets 10,665 11,221  
Total liabilities 9,768 10,447  
Sales 1,646 1,424  
Profit (loss) for the year 169 54  
KIAMCO KOWEPO Bannerton Hold Co Pty Ltd      
Disclosure of joint ventures [line items]      
Total assets 30,081 29,517  
Total liabilities 84 74  
Sales 0 0  
Profit (loss) for the year (182) (260)  
Chile Solar JV SpA      
Disclosure of joint ventures [line items]      
Total assets   75,246  
Total liabilities   55,609  
Sales   7,842  
Profit (loss) for the year   6,425  
Cheong-Song Noraesan Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 54,086 55,948  
Total liabilities 41,352 41,464  
Sales 6,780 7,988  
Profit (loss) for the year 1,240 1,916  
Chester Solar I SpA      
Disclosure of joint ventures [line items]      
Total assets 12,846 13,246  
Total liabilities 10,712 10,933  
Sales 1,620 1,094  
Profit (loss) for the year 214 (221)  
Solar Philippines Calatagan Corporation      
Disclosure of joint ventures [line items]      
Total assets 146,304 113,327  
Total liabilities 37,922 36,756  
Sales 16,420 17,728  
Profit (loss) for the year 9,121 10,194  
Saemangeum Solar Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 34,905 35,890  
Total liabilities 5,994 6,817  
Sales 0 0  
Profit (loss) for the year (162) (479)  
Chungsongmeon BongSan wind power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 83,147 81,030  
Total liabilities 80,102 75,207  
Sales 0 0  
Profit (loss) for the year (925) (1,120)  
Jaeun Resident Wind Power Plant Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 95,529 89,756  
Total liabilities 87,893 82,047  
Sales 181 0  
Profit (loss) for the year (80) (190)  
DE Energia SpA      
Disclosure of joint ventures [line items]      
Total assets 28,017 48,350  
Total liabilities 21,416 62,481  
Sales 5,006 5,959  
Profit (loss) for the year 21,118 (1,109)  
Dangjin Eco Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 96,980 98,714  
Total liabilities 19,299 20,721  
Sales 3,789 4,185  
Profit (loss) for the year 589 700  
Haemodum Solar Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 21,612 22,974  
Total liabilities 15,241 16,103  
Sales 2,216 2,556  
Profit (loss) for the year 299 581  
Yangyang Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 124,550 107,471  
Total liabilities 103,766 85,829  
Sales 211 0  
Profit (loss) for the year (858) (634)  
Horus Solar, S.A. De C.V.      
Disclosure of joint ventures [line items]      
Total assets 210,868 156,436  
Total liabilities 160,006 133,714  
Sales 20,586 5,568  
Profit (loss) for the year 26,865 5,628  
Recursos Solares PV De Mexico II, S.A. De C.V.      
Disclosure of joint ventures [line items]      
Total assets 239,548 173,262  
Total liabilities 180,912 155,009  
Sales 4,920 468  
Profit (loss) for the year 24,984 457  
Sunmex Renovables, S.A. De C.V.      
Disclosure of joint ventures [line items]      
Total assets 156,696 129,502  
Total liabilities 133,032 118,449  
Sales 0 0  
Profit (loss) for the year 6,232 (1,008)  
Stavro Holding II A.B.      
Disclosure of joint ventures [line items]      
Total assets 91,342 85,883  
Total liabilities 28 27  
Sales 0 0  
Profit (loss) for the year (87) 61  
Solaseado Solar Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 346,793 363,492  
Total liabilities 304,142 325,262  
Sales 39,907 51,198  
Profit (loss) for the year 4,823 16,301  
Yeongam Solar Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 326,429 329,714  
Total liabilities 279,779 281,791  
Sales 35,280 44,568  
Profit (loss) for the year 4,506 8,563  
Samsu Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 67,150 71,123  
Total liabilities 51,247 54,254  
Sales 8,751 10,118  
Profit (loss) for the year 1,741 1,987  
Pulau Indah Power Plant Sdn. Bhd.      
Disclosure of joint ventures [line items]      
Total assets 800,300 760,536  
Total liabilities 720,459 675,853  
Sales 431 797  
Profit (loss) for the year 2,095 6,723  
NH-Amundi Global Infrastructure Investment Private Investment Trust 21      
Disclosure of joint ventures [line items]      
Total assets 72,465 71,851  
Total liabilities 97 74  
Sales 7,569 4,850  
Profit (loss) for the year 7,080 5,431  
Shin-han BNPP Private Investment Trust for East-West Sunlight Dream      
Disclosure of joint ventures [line items]      
Total assets 17,230 17,341  
Total liabilities 22 22  
Sales 38 38  
Profit (loss) for the year (3) (10)  
PT Barito Wahana Tenaga      
Disclosure of joint ventures [line items]      
Total assets 512,846 447,688  
Total liabilities 0 0  
Sales 0 0  
Profit (loss) for the year 72,320 49,471  
Cheongna Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 428,042 385,935  
Total liabilities 380,935 368,340  
Sales 119,530 100,200  
Profit (loss) for the year 29,511 (889)  
Naepo Green Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 695,684 448,309  
Total liabilities 677,583 499,528  
Sales 312,592 8,905  
Profit (loss) for the year 53,343 (34,347)  
Boim Combined Heat and Power Generation Co., Ltd. (formerly, Dayone Energy Co., Ltd.)      
Disclosure of joint ventures [line items]      
Total assets 441,975 470,677  
Total liabilities 498,353 530,304  
Sales 212,997 278,363  
Profit (loss) for the year 5,544 (12,893)  
OneEnergy Asia Limited      
Disclosure of joint ventures [line items]      
Total assets 2,181,165 1,039,987  
Total liabilities 1,520,032 673,223  
Sales 1,149,944 0  
Profit (loss) for the year 94,298 16,041  
KAS Investment I LLC      
Disclosure of joint ventures [line items]      
Total assets 52,806 61,907  
Total liabilities 0 861  
Sales (7,436) 1,603  
Profit (loss) for the year (7,437) 6,998  
KAS Investment II LLC      
Disclosure of joint ventures [line items]      
Total assets 52,555 61,661  
Total liabilities 1 861  
Sales (7,444) 1,592  
Profit (loss) for the year (7,445) 6,967  
Energyco LLC      
Disclosure of joint ventures [line items]      
Total assets 54,336 56,996  
Total liabilities 49,816 52,304  
Sales 6,599 7,898  
Profit (loss) for the year (173) 2,258  
CAES, LLC      
Disclosure of joint ventures [line items]      
Total assets 48,495 49,676  
Total liabilities 5 6  
Sales 0 0  
Profit (loss) for the year (2,388) (547)  
Hapcheon Floating Photovoltaic Power Plant Inc.      
Disclosure of joint ventures [line items]      
Total assets 79,924 78,768  
Total liabilities 58,887 61,561  
Sales 12,679 12,705  
Profit (loss) for the year 4,266 3,061  
Busan Industrial Solar Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 18,636 21,149  
Total liabilities 15,896 18,016  
Sales 2,378 3,190  
Profit (loss) for the year 106 901  
Bitsolar Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 73,435 78,779  
Total liabilities 79,367 83,324  
Sales 8,249 9,557  
Profit (loss) for the year (1,125) 261  
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 10,646 10,148  
Total liabilities 8,811 8,790  
Sales 1,684 924  
Profit (loss) for the year 626 (43)  
Omisan Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 150,813 142,274  
Total liabilities 126,853 117,881  
Sales 0 0  
Profit (loss) for the year (453) (519)  
Foresight Iberian Solar Group Holding, S.L.      
Disclosure of joint ventures [line items]      
Total assets 94,972 94,181  
Total liabilities 86,049 81,997  
Sales 0 0  
Profit (loss) for the year (2,712) (1,365)  
Yeongwol Eco Wind Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 109,716 87,856  
Total liabilities 102,143 83,281  
Sales 3,561 0  
Profit (loss) for the year 2,975 (144)  
Gurae Resident Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 14,096 11,649  
Total liabilities 12,299 10,467  
Sales 652 0  
Profit (loss) for the year 615 (19)  
Cheongju Eco Park Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 145,956 152,139  
Total liabilities 115,347 116,639  
Sales 38,907 66,260  
Profit (loss) for the year (4,892) 17,319  
Enel X Midland Photovoltaic, LLC      
Disclosure of joint ventures [line items]      
Total assets 12,825 10,289  
Total liabilities 115 1,010  
Sales 2,128 1,684  
Profit (loss) for the year 850 837  
Geumsungsan Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 142,703 125,324  
Total liabilities 125,602 115,196  
Sales 13,568 0  
Profit (loss) for the year 6,570 (1,770)  
KEPCO KPS CARABAO Corp.      
Disclosure of joint ventures [line items]      
Total assets 375 2,025  
Total liabilities 468 1,582  
Sales 0 611  
Profit (loss) for the year (467) (327)  
Prime Swedish Holding AB      
Disclosure of joint ventures [line items]      
Total assets 83,699 77,942  
Total liabilities 218 114  
Sales 0 0  
Profit (loss) for the year (524) (577)  
Goheung New Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 177,924 136,682  
Total liabilities 146,175 113,393  
Sales 29,246 0  
Profit (loss) for the year 8,460 (1,591)  
Gunsan Land Solar Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 144,435 158,371  
Total liabilities 108,848 121,785  
Sales 23,523 28,828  
Profit (loss) for the year (974) 12,154  
Capman Lynx SCA, SICAR      
Disclosure of joint ventures [line items]      
Total assets 139,262 112,718  
Total liabilities 132,430 102,810  
Sales 1,427 504  
Profit (loss) for the year (12,401) (16,780)  
International Offshore Power Transmission Holding Company Limited      
Disclosure of joint ventures [line items]      
Total assets 6,555 4,680  
Total liabilities 2,486 71,468  
Sales 0 0  
Profit (loss) for the year (195) (68,093)  
Pyeongchang Wind Power Co., Ltd      
Disclosure of joint ventures [line items]      
Total assets 60,535 70,599  
Total liabilities 39,452 45,661  
Sales 9,361 14,524  
Profit (loss) for the year (2,354) 3,693  
Eumseong Eco Park Co., Ltd      
Disclosure of joint ventures [line items]      
Total assets 153,927 136,909  
Total liabilities 126,998 119,736  
Sales 46,679 0  
Profit (loss) for the year 5,609 (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 13,183 1,490  
Total liabilities 29 0  
Sales 0 0  
Profit (loss) for the year (44) (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 70,330 46,957  
Total liabilities 51,804 31,667  
Sales 0 0  
Profit (loss) for the year (255) (3,089)  
Trumbull Asset Management, LLC      
Disclosure of joint ventures [line items]      
Total assets 1,697 316  
Total liabilities 497 0  
Sales 5,955 656  
Profit (loss) for the year 887 323  
S-Power Chile SpA      
Disclosure of joint ventures [line items]      
Total assets 2,240 2,430  
Total liabilities 2,390 2,450  
Sales 1,327 1,334  
Profit (loss) for the year (139) 22  
Seungmun Green Energy      
Disclosure of joint ventures [line items]      
Total assets 144,600 46,283  
Total liabilities 115,034 18,843  
Sales 10,879 0  
Profit (loss) for the year 2,127 367  
Seobusambo highway photovoltaics Co., Ltd      
Disclosure of joint ventures [line items]      
Total assets 9,838 8,286  
Total liabilities 5,362 4,453  
Sales 1,051 217  
Profit (loss) for the year 624 ₩ 265  
Yangyang Suri Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 111,682    
Total liabilities 78,552    
Sales 0    
Profit (loss) for the year (3,069)    
KEPCO for Power Company      
Disclosure of joint ventures [line items]      
Total assets 235,212    
Total liabilities 234,487    
Sales 0    
Profit (loss) for the year (3,610)    
Taebaek Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 26,606    
Total liabilities 3,385    
Sales 7,384    
Profit (loss) for the year 3,752    
Jeonju Bio Green Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 4,916    
Total liabilities 0    
Sales 0    
Profit (loss) for the year (84)    
Kumyang Eco Park Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 13,831    
Total liabilities 1,395    
Sales 0    
Profit (loss) for the year (71)    
Jeongeup Green Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 11,243    
Total liabilities 5,462    
Sales 0    
Profit (loss) for the year (1,343)    
Hadong E-factory Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 1,544    
Total liabilities 399    
Sales 0    
Profit (loss) for the year (13)    
Namyangju Combined Heat and Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 7,000    
Total liabilities 0    
Sales 0    
Profit (loss) for the year 0    
Wadi Noor Solar Power Company SAOC      
Disclosure of joint ventures [line items]      
Total assets 70,963    
Total liabilities 69,288    
Sales 0    
Profit (loss) for the year 0    
Fairhaven Energy Storage LLC      
Disclosure of joint ventures [line items]      
Total assets 0    
Total liabilities 0    
Sales 0    
Profit (loss) for the year ₩ 0