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Investments in Joint Ventures 3 (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of joint ventures [line items]      
Total assets ₩ 246,807,795 ₩ 239,714,965  
Total liabilities 205,444,962 202,450,215  
Sales 92,578,265 87,476,410 ₩ 70,546,024
Profit (loss) for the year 3,621,968 (4,716,144) ₩ (24,429,108)
Shuweihat Asia Power Investment B.V.      
Disclosure of joint ventures [line items]      
Total assets 176,569 142,680  
Total liabilities 137 20  
Sales 0 0  
Profit (loss) for the year (370) 897  
Shuweihat Asia Operation & Maintenance Company      
Disclosure of joint ventures [line items]      
Total assets 4,215 4,421  
Total liabilities 328 1,116  
Sales 3,574 3,194  
Profit (loss) for the year 2,293 2,249  
Waterbury Lake Uranium L.P.      
Disclosure of joint ventures [line items]      
Total assets 80,803 74,320  
Total liabilities 761 550  
Sales 0 0  
Profit (loss) for the year 0 0  
ASM-BG Investicii AD      
Disclosure of joint ventures [line items]      
Total assets 68,437 68,837  
Total liabilities 34,565 39,359  
Sales 12,815 10,931  
Profit (loss) for the year 2,824 1,359  
RES Technology AD      
Disclosure of joint ventures [line items]      
Total assets 57,356 58,152  
Total liabilities 27,219 29,387  
Sales 7,395 5,969  
Profit (loss) for the year (292) (1,027)  
KV Holdings, Inc.      
Disclosure of joint ventures [line items]      
Total assets 17,304 12,968  
Total liabilities 1 2  
Sales 1,778 20  
Profit (loss) for the year 1,799 367  
KEPCO SPC Power Corporation      
Disclosure of joint ventures [line items]      
Total assets 291,538 288,140  
Total liabilities 26,307 26,778  
Sales 190,296 222,773  
Profit (loss) for the year 28,108 17,270  
Gansu Datang Yumen Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 63,240 61,657  
Total liabilities 43,443 45,869  
Sales 10,721 10,684  
Profit (loss) for the year 944 791  
Datang Chifeng Renewable Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 900,001 812,124  
Total liabilities 388,711 345,277  
Sales 115,297 117,833  
Profit (loss) for the year 17,722 25,055  
Datang KEPCO Chaoyang Renewable Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 180,827 166,959  
Total liabilities 60,016 58,942  
Sales 26,678 23,638  
Profit (loss) for the year 2,031 1,597  
Rabigh Electricity Company      
Disclosure of joint ventures [line items]      
Total assets 2,651,843 2,556,848  
Total liabilities 1,873,439 1,855,234  
Sales 353,677 304,727  
Profit (loss) for the year 63,270 51,539  
Rabigh Operation & Maintenance Company Limited      
Disclosure of joint ventures [line items]      
Total assets 40,983 40,339  
Total liabilities 20,205 27,928  
Sales 30,841 31,301  
Profit (loss) for the year 5,840 6,676  
Jamaica Public Service Company Limited      
Disclosure of joint ventures [line items]      
Total assets 2,649,022 2,332,019  
Total liabilities 1,656,068 1,491,199  
Sales 1,490,606 1,400,582  
Profit (loss) for the year 76,611 87,307  
KW Nuclear Components Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 47,498 42,363  
Total liabilities 5,423 460  
Sales 6,919 14,344  
Profit (loss) for the year 2,510 5,386  
Busan Shinho Solar Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 28,837 31,863  
Total liabilities 865 5,188  
Sales 8,452 9,197  
Profit (loss) for the year 3,963 4,473  
Global Trade Of Power System Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 2,976 2,398  
Total liabilities 574 277  
Sales 3,635 2,044  
Profit (loss) for the year 290 (229)  
Expressway Solar-light Power Generation Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 11,709 13,065  
Total liabilities 168 2,691  
Sales 3,219 3,397  
Profit (loss) for the year 1,214 892  
Amman Asia Electric Power Company      
Disclosure of joint ventures [line items]      
Total assets 791,478 719,388  
Total liabilities 343,371 347,015  
Sales 22,776 21,772  
Profit (loss) for the year 34,047 33,811  
KAPES, Inc.      
Disclosure of joint ventures [line items]      
Total assets 299,380 203,066  
Total liabilities 257,858 165,475  
Sales 43,699 32,294  
Profit (loss) for the year 6,224 2,150  
Honam Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 29,174 31,183  
Total liabilities 12,618 14,938  
Sales 6,508 6,570  
Profit (loss) for the year 1,810 1,540  
Korea Power Engineering Service Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 22,701 21,534  
Total liabilities 1,828 1,853  
Sales 12,983 11,248  
Profit (loss) for the year 1,444 1,203  
Chun-cheon Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 533,211 565,972  
Total liabilities 409,989 447,820  
Sales 430,679 502,889  
Profit (loss) for the year 4,890 10,435  
Yeonggwangbaeksu Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 69,249 73,854  
Total liabilities 44,422 50,936  
Sales 12,636 13,523  
Profit (loss) for the year 2,156 1,944  
Nghi Son 2 Power LLC      
Disclosure of joint ventures [line items]      
Total assets 4,412,970 3,775,717  
Total liabilities 3,286,814 2,939,740  
Sales 921,504 825,701  
Profit (loss) for the year 91,777 33,505  
Kelar S.A      
Disclosure of joint ventures [line items]      
Total assets 715,489 691,104  
Total liabilities 486,293 493,325  
Sales 112,110 112,201  
Profit (loss) for the year 9,733 12,488  
PT. Tanjung Power Indonesia      
Disclosure of joint ventures [line items]      
Total assets 754,514 704,274  
Total liabilities 467,144 446,700  
Sales 106,081 111,138  
Profit (loss) for the year 17,705 21,854  
Incheon New Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 1,267 1,404  
Total liabilities 227 377  
Sales 2,777 3,781  
Profit (loss) for the year 36 485  
Seokmun Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 192,083 201,776  
Total liabilities 138,787 144,565  
Sales 51,233 54,575  
Profit (loss) for the year (4,558) (1,581)  
Daehan Wind Power PSC      
Disclosure of joint ventures [line items]      
Total assets 173,637 144,260  
Total liabilities 130,982 111,407  
Sales 18,496 17,880  
Profit (loss) for the year 3,584 4,951  
Barakah One Company      
Disclosure of joint ventures [line items]      
Total assets 43,235,235 35,586,640  
Total liabilities 45,056,439 36,901,367  
Sales 1,636,730 1,243,735  
Profit (loss) for the year (53,778) (230,503)  
Nawah Energy Company      
Disclosure of joint ventures [line items]      
Total assets 701,247 569,982  
Total liabilities 699,068 568,147  
Sales 566,077 555,338  
Profit (loss) for the year 40 34  
Momentum      
Disclosure of joint ventures [line items]      
Total assets 7,422 13,449  
Total liabilities 6,836 12,821  
Sales 22,770 23,160  
Profit (loss) for the year 586 624  
Daegu Green Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 493,595 515,354  
Total liabilities 399,918 429,204  
Sales 338,750 380,130  
Profit (loss) for the year 7,344 (5,146)  
Yeonggwang Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 217,987 225,286  
Total liabilities 162,218 175,530  
Sales 32,114 36,326  
Profit (loss) for the year 7,971 11,672  
Chester Solar IV SpA      
Disclosure of joint ventures [line items]      
Total assets 12,649 12,435  
Total liabilities 12,309 11,504  
Sales 1,941 2,119  
Profit (loss) for the year (676) 395  
Chester Solar V SpA      
Disclosure of joint ventures [line items]      
Total assets 4,260 4,124  
Total liabilities 4,321 4,002  
Sales 631 696  
Profit (loss) for the year (176) 141  
Diego de Almagro Solar SpA      
Disclosure of joint ventures [line items]      
Total assets 16,301 15,785  
Total liabilities 15,161 13,907  
Sales 2,625 3,114  
Profit (loss) for the year (667) 931  
South Jamaica Power Company Limited      
Disclosure of joint ventures [line items]      
Total assets 532,323 482,866  
Total liabilities 288,501 267,307  
Sales 250,519 240,664  
Profit (loss) for the year 14,460 18,833  
Daesan Green Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 225,765 237,663  
Total liabilities 153,391 174,261  
Sales 110,002 111,225  
Profit (loss) for the year 5,960 11,480  
RE Holiday Holdings LLC      
Disclosure of joint ventures [line items]      
Total assets 363,750 340,773  
Total liabilities 184,188 172,589  
Sales 20,251 21,178  
Profit (loss) for the year (1,413) 664  
RE Pioneer Holdings LLC      
Disclosure of joint ventures [line items]      
Total assets 272,900 257,091  
Total liabilities 161,657 148,929  
Sales 13,343 14,136  
Profit (loss) for the year (3,168) (2,164)  
RE Barren Ridge 1 Holdings LLC      
Disclosure of joint ventures [line items]      
Total assets 224,922 213,491  
Total liabilities 105,310 97,184  
Sales 12,905 11,915  
Profit (loss) for the year (1,301) (1,979)  
RE Astoria 2 LandCo LLC      
Disclosure of joint ventures [line items]      
Total assets 16,514 14,116  
Total liabilities 276 242  
Sales 1,060 1,014  
Profit (loss) for the year 848 823  
RE Barren Ridge LandCo LLC      
Disclosure of joint ventures [line items]      
Total assets 5,826 4,980  
Total liabilities 110 97  
Sales 411 393  
Profit (loss) for the year 342 329  
Laurel SpA      
Disclosure of joint ventures [line items]      
Total assets 10,897 10,665  
Total liabilities 10,471 9,768  
Sales 1,522 1,646  
Profit (loss) for the year (557) 169  
KIAMCO KOWEPO Bannerton Hold Co Pty Ltd      
Disclosure of joint ventures [line items]      
Total assets 33,736 30,081  
Total liabilities 150 84  
Sales 0 0  
Profit (loss) for the year 70 (182)  
Cheong-Song Noraesan Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 53,374 54,086  
Total liabilities 38,705 41,352  
Sales 6,788 6,780  
Profit (loss) for the year 1,599 1,240  
Chester Solar I SpA      
Disclosure of joint ventures [line items]      
Total assets 12,935 12,846  
Total liabilities 11,454 10,712  
Sales 1,395 1,620  
Profit (loss) for the year (745) 214  
Solar Philippines Calatagan Corporation      
Disclosure of joint ventures [line items]      
Total assets 166,126 146,304  
Total liabilities 37,872 37,922  
Sales 19,412 16,420  
Profit (loss) for the year 8,733 9,121  
Saemangeum Solar Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 34,377 34,905  
Total liabilities 5,643 5,994  
Sales 0 0  
Profit (loss) for the year (176) (162)  
Chungsongmeon BongSan wind power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 86,708 83,147  
Total liabilities 83,921 80,102  
Sales 0 0  
Profit (loss) for the year (399) (925)  
Jaeun Resident Wind Power Plant Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 95,657 95,529  
Total liabilities 88,605 87,893  
Sales 0 181  
Profit (loss) for the year (380) (80)  
DE Energia SpA      
Disclosure of joint ventures [line items]      
Total assets 32,263 28,017  
Total liabilities 24,853 21,416  
Sales 0 5,006  
Profit (loss) for the year 3,163 21,118  
Dangjin Eco Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 90,750 96,980  
Total liabilities 12,732 19,299  
Sales 3,645 3,789  
Profit (loss) for the year 743 589  
Haemodum Solar Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 21,036 21,612  
Total liabilities 14,444 15,241  
Sales 2,060 2,216  
Profit (loss) for the year 232 299  
Yangyang Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 146,697 124,550  
Total liabilities 123,504 103,766  
Sales 11,948 211  
Profit (loss) for the year 2,334 (858)  
Horus Solar, S.A. De C.V.      
Disclosure of joint ventures [line items]      
Total assets 170,018 210,868  
Total liabilities 184,014 160,006  
Sales 35,080 20,586  
Profit (loss) for the year (43,774) 26,865  
Recursos Solares PV De Mexico II, S.A. De C.V.      
Disclosure of joint ventures [line items]      
Total assets 238,276 239,548  
Total liabilities 223,019 180,912  
Sales 19,178 4,920  
Profit (loss) for the year (37,720) 24,984  
Sunmex Renovables, S.A. De C.V.      
Disclosure of joint ventures [line items]      
Total assets 182,159 156,696  
Total liabilities 170,906 133,032  
Sales 0 0  
Profit (loss) for the year (15,771) 6,232  
Stavro Holding II A.B.      
Disclosure of joint ventures [line items]      
Total assets 82,407 91,342  
Total liabilities 114 28  
Sales 0 0  
Profit (loss) for the year (11,632) (87)  
Solaseado Solar Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 347,831 346,793  
Total liabilities 292,737 304,142  
Sales 46,361 39,907  
Profit (loss) for the year 12,443 4,823  
Yeongam Solar Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 318,641 326,429  
Total liabilities 260,459 279,779  
Sales 34,509 35,280  
Profit (loss) for the year 10,880 4,506  
Samsu Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 61,678 67,150  
Total liabilities 46,675 51,247  
Sales 7,051 8,751  
Profit (loss) for the year 682 1,741  
Pulau Indah Power Plant Sdn. Bhd.      
Disclosure of joint ventures [line items]      
Total assets 1,054,236 800,300  
Total liabilities 873,923 720,459  
Sales 40,818 431  
Profit (loss) for the year (2,896) 2,095  
NH-Amundi Global Infrastructure Investment Private Investment Trust 21      
Disclosure of joint ventures [line items]      
Total assets 52,533 72,465  
Total liabilities 271 97  
Sales 3,054 7,569  
Profit (loss) for the year (23,354) 7,080  
Shin-han BNPP Private Investment Trust for East-West Sunlight Dream      
Disclosure of joint ventures [line items]      
Total assets 17,251 17,230  
Total liabilities 33 22  
Sales 227 38  
Profit (loss) for the year 182 (3)  
PT Barito Wahana Tenaga      
Disclosure of joint ventures [line items]      
Total assets 678,043 512,846  
Total liabilities 0 0  
Sales 0 0  
Profit (loss) for the year 74,744 72,320  
Cheongna Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 463,574 428,042  
Total liabilities 375,343 380,935  
Sales 142,400 119,530  
Profit (loss) for the year 41,124 29,511  
Naepo Green Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 738,857 695,684  
Total liabilities 586,152 677,583  
Sales 467,225 312,592  
Profit (loss) for the year 124,830 53,343  
Boim Combined Heat and Power Generation Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 421,954 441,975  
Total liabilities 480,084 498,353  
Sales 139,134 212,997  
Profit (loss) for the year 294 5,544  
OneEnergy Asia Limited      
Disclosure of joint ventures [line items]      
Total assets 3,237,191 2,181,165  
Total liabilities 2,137,600 1,520,032  
Sales 424,036 1,149,944  
Profit (loss) for the year 100,781 94,298  
KAS Investment I LLC      
Disclosure of joint ventures [line items]      
Total assets 20,361 52,806  
Total liabilities 28 0  
Sales (40,343) (7,436)  
Profit (loss) for the year (43,213) (7,437)  
KAS Investment II LLC      
Disclosure of joint ventures [line items]      
Total assets 20,233 52,555  
Total liabilities 28 1  
Sales (40,189) (7,444)  
Profit (loss) for the year (43,048) (7,445)  
Energyco LLC      
Disclosure of joint ventures [line items]      
Total assets   54,336  
Total liabilities   49,816  
Sales   6,599  
Profit (loss) for the year   (173)  
Energyco Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 50,310    
Total liabilities 45,161    
Sales 6,221    
Profit (loss) for the year 629    
CAES, LLC      
Disclosure of joint ventures [line items]      
Total assets 49,267 48,495  
Total liabilities 0 5  
Sales 0 0  
Profit (loss) for the year 946 (2,388)  
Hapcheon Floating Photovoltaic Power Plant Inc.      
Disclosure of joint ventures [line items]      
Total assets 76,903 79,924  
Total liabilities 53,853 58,887  
Sales 12,361 12,679  
Profit (loss) for the year 3,992 4,266  
Busan Industrial Solar Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 18,236 18,636  
Total liabilities 15,133 15,896  
Sales 2,262 2,378  
Profit (loss) for the year 191 106  
Bitsolar Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 68,249 73,435  
Total liabilities 74,213 79,367  
Sales 8,300 8,249  
Profit (loss) for the year (390) (1,125)  
Pulau Indah O&M Sdn. Bhd.      
Disclosure of joint ventures [line items]      
Total assets 1 0  
Total liabilities 2 0  
Sales 0 0  
Profit (loss) for the year 24 0  
Guadalupe Solar SpA      
Disclosure of joint ventures [line items]      
Total assets 10,477 10,646  
Total liabilities 9,339 8,811  
Sales 1,408 1,684  
Profit (loss) for the year (574) 626  
Omisan Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 180,001 150,813  
Total liabilities 154,541 126,853  
Sales 4,785 0  
Profit (loss) for the year 1,480 (453)  
Foresight Iberian Solar Group Holding, S.L.      
Disclosure of joint ventures [line items]      
Total assets 187,118 94,972  
Total liabilities 194,881 86,049  
Sales 3,262 0  
Profit (loss) for the year (13,206) (2,712)  
Yeongwol Eco Wind Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 99,288 109,716  
Total liabilities 102,522 102,143  
Sales 7,118 3,561  
Profit (loss) for the year (5,518) 2,975  
Gurae Resident Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 12,845 14,096  
Total liabilities 11,861 12,299  
Sales 1,490 652  
Profit (loss) for the year (101) 615  
Cheongju Eco Park Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 145,162 145,956  
Total liabilities 109,158 115,347  
Sales 37,392 38,907  
Profit (loss) for the year 2,415 (4,892)  
Enel X Midland Photovoltaic, LLC      
Disclosure of joint ventures [line items]      
Total assets 13,694 12,825  
Total liabilities 119 115  
Sales 2,470 2,128  
Profit (loss) for the year 865 850  
Geumsungsan Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 143,725 142,703  
Total liabilities 118,608 125,602  
Sales 21,048 13,568  
Profit (loss) for the year 7,349 6,570  
KEPCO KPS CARABAO Corp.      
Disclosure of joint ventures [line items]      
Total assets 226 375  
Total liabilities 835 468  
Sales 0 0  
Profit (loss) for the year (513) (467)  
Prime Swedish Holding AB      
Disclosure of joint ventures [line items]      
Total assets 143,102 83,699  
Total liabilities 62,354 218  
Sales 8,911 0  
Profit (loss) for the year (8,404) (524)  
Goheung New Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 174,255 177,924  
Total liabilities 142,437 146,175  
Sales 28,059 29,246  
Profit (loss) for the year 2,190 8,460  
Gunsan Land Solar Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 144,887 144,435  
Total liabilities 104,284 108,848  
Sales 22,154 23,523  
Profit (loss) for the year 4,939 (974)  
Capman Lynx SCA, SICAR      
Disclosure of joint ventures [line items]      
Total assets 3,319 139,262  
Total liabilities 134,790 132,430  
Sales 0 1,427  
Profit (loss) for the year (4,808) (12,401)  
International Offshore Power Transmission Holding Company Limited      
Disclosure of joint ventures [line items]      
Total assets 33,191 6,555  
Total liabilities 1,650 2,486  
Sales 0 0  
Profit (loss) for the year (213) (195)  
Pyeongchang Wind Power Co., Ltd      
Disclosure of joint ventures [line items]      
Total assets 55,697 60,535  
Total liabilities 34,754 39,452  
Sales 9,261 9,361  
Profit (loss) for the year (536) (2,354)  
Eumseong Eco Park Co., Ltd      
Disclosure of joint ventures [line items]      
Total assets 149,904 153,927  
Total liabilities 111,846 126,998  
Sales 45,239 46,679  
Profit (loss) for the year 9,512 5,609  
Changwon Nu-ri Energy Co., Ltd      
Disclosure of joint ventures [line items]      
Total assets 71,179 13,183  
Total liabilities 58,630 29  
Sales 333 0  
Profit (loss) for the year (606) (44)  
PungBack Wind Farm Corporation      
Disclosure of joint ventures [line items]      
Total assets 148,157 70,330  
Total liabilities 130,116 51,804  
Sales 0 0  
Profit (loss) for the year (536) (255)  
Trumbull Asset Management, LLC      
Disclosure of joint ventures [line items]      
Total assets 2,572 1,697  
Total liabilities 910 497  
Sales 4,501 5,955  
Profit (loss) for the year 486 887  
S-Power Chile SpA      
Disclosure of joint ventures [line items]      
Total assets 2,779 2,240  
Total liabilities 2,778 2,390  
Sales 1,369 1,327  
Profit (loss) for the year 108 (139)  
Seungmun Green Energy      
Disclosure of joint ventures [line items]      
Total assets 142,213 144,600  
Total liabilities 103,593 115,034  
Sales 46,712 10,879  
Profit (loss) for the year 9,026 2,127  
Seobusambo highway photovoltaics Co., Ltd      
Disclosure of joint ventures [line items]      
Total assets 10,245 9,838  
Total liabilities 6,108 5,362  
Sales 1,214 1,051  
Profit (loss) for the year 26 624  
Yangyang Suri Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 210,853 111,682  
Total liabilities 181,052 78,552  
Sales 0 0  
Profit (loss) for the year (5,391) (3,069)  
KEPCO for Power Company      
Disclosure of joint ventures [line items]      
Total assets 644,110 235,212  
Total liabilities 614,267 234,487  
Sales 0 0  
Profit (loss) for the year (1,058) (3,610)  
Taebaek Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 28,067 26,606  
Total liabilities 3,468 3,385  
Sales 6,431 7,384  
Profit (loss) for the year 2,169 3,752  
Jeonju Bio Green Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 4,130 4,916  
Total liabilities 181 0  
Sales 0 0  
Profit (loss) for the year (967) (84)  
Kumyang Eco Park Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 125,961 13,831  
Total liabilities 112,910 1,395  
Sales 3,169 0  
Profit (loss) for the year 615 (71)  
Jeongeup Green Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 22,939 11,243  
Total liabilities 6,960 5,462  
Sales 0 0  
Profit (loss) for the year (2,767) (1,343)  
Hadong E-factory Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 2,331 1,544  
Total liabilities 1,204 399  
Sales 0 0  
Profit (loss) for the year (17) (13)  
Namyangju Combined Heat and Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 75,474 7,000  
Total liabilities 1,899 0  
Sales 0 0  
Profit (loss) for the year (2,410) 0  
Samcheok Eco Materials Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 21,109    
Total liabilities 1,981    
Sales 3,352    
Profit (loss) for the year (1,357)    
Wadi Noor Solar Power Company SAOC      
Disclosure of joint ventures [line items]      
Total assets 492,407 70,963  
Total liabilities 481,139 69,288  
Sales 0 0  
Profit (loss) for the year (1,477) 0  
Fairhaven Energy Storage LLC      
Disclosure of joint ventures [line items]      
Total assets 2,071 0  
Total liabilities 82 0  
Sales 0 0  
Profit (loss) for the year (14) ₩ 0  
Rutile BESS Holdings, LLC      
Disclosure of joint ventures [line items]      
Total assets 7,353    
Total liabilities 7,350    
Sales 0    
Profit (loss) for the year (211)    
Trumbull Development Partners, LLC      
Disclosure of joint ventures [line items]      
Total assets 1,582,082    
Total liabilities 1,042,712    
Sales 0    
Profit (loss) for the year 14,174    
Imha Floating Photovoltaic Power Plant Inc.      
Disclosure of joint ventures [line items]      
Total assets 36,412    
Total liabilities 23,546    
Sales 0    
Profit (loss) for the year (1,679)    
EDFR KOWEPO AJBAN PV HOLDING LIMITED      
Disclosure of joint ventures [line items]      
Total assets 37,776    
Total liabilities 37,606    
Sales 0    
Profit (loss) for the year (143)    
Roof One Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Total assets 9,305    
Total liabilities 5,209    
Sales 0    
Profit (loss) for the year ₩ (46)