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Investments in Associates 3 (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of associates [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 period (4,716,144) (24,429,108) ₩ (5,215,581)
Korea Gas Corporation      
Disclosure of associates [line items]      
Total assets 57,254,666 62,424,983  
Total liabilities 47,428,628 52,014,243  
Sales 44,555,995 51,724,287  
Profit (loss) for the period (747,428) 1,497,008  
Korea Electric Power Industrial Development Co., Ltd.      
Disclosure of associates [line items]      
Total assets 174,788 148,112  
Total liabilities 73,065 40,946  
Sales 354,850 336,333  
Profit (loss) for the period 21,170 15,434  
YTN Co., Ltd.      
Disclosure of associates [line items]      
Total assets 352,188 364,115  
Total liabilities 108,108 107,324  
Sales 130,450 152,187  
Profit (loss) for the period (3,616) 7,250  
Gangwon Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Total assets 83,062 86,758  
Total liabilities 3,380 6,029  
Sales 32,525 40,130  
Profit (loss) for the period 14,098 20,163  
Hyundai Green Power Co., Ltd.      
Disclosure of associates [line items]      
Total assets 738,107 773,998  
Total liabilities 330,616 360,926  
Sales 107,367 105,374  
Profit (loss) for the period 7,446 5,010  
Korea Power Exchange      
Disclosure of associates [line items]      
Total assets 366,092 311,691  
Total liabilities 91,806 36,564  
Sales 119,182 118,501  
Profit (loss) for the period 4,443 1,036  
Taebaek Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Total assets   27,562  
Total liabilities   3,394  
Sales   7,565  
Profit (loss) for the period   551  
Taebaek Guinemi Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Total assets 42,243 44,036  
Total liabilities 26,200 28,709  
Sales 5,529 6,793  
Profit (loss) for the period 716 1,906  
Daeryun Power Co., Ltd.      
Disclosure of associates [line items]      
Total assets 1,120,453 1,201,510  
Total liabilities 716,752 799,370  
Sales 451,527 472,211  
Profit (loss) for the period 4,043 4,999  
KNH Solar Co., Ltd.      
Disclosure of associates [line items]      
Total assets 12,142 13,584  
Total liabilities 314 2,905  
Sales 3,535 4,348  
Profit (loss) for the period 1,394 2,173  
SPC Power Corporation      
Disclosure of associates [line items]      
Total assets 287,249 254,951  
Total liabilities 28,485 26,417  
Sales 106,926 80,630  
Profit (loss) for the period 27,946 25,614  
Gemeng International Energy Co., Ltd.      
Disclosure of associates [line items]      
Total assets 7,507,274 7,796,180  
Total liabilities 5,189,729 5,460,183  
Sales 2,963,614 3,183,398  
Profit (loss) for the period 33,580 11,637  
PT. Cirebon Electric Power      
Disclosure of associates [line items]      
Total assets 665,365 691,311  
Total liabilities 177,150 199,987  
Sales 265,054 287,261  
Profit (loss) for the period 27,341 53,730  
KNOC Nigerian East Oil Co., Ltd.      
Disclosure of associates [line items]      
Total assets 27,029 26,491  
Total liabilities 112,017 109,974  
Sales 0 0  
Profit (loss) for the period (50) (72)  
KNOC Nigerian West Oil Co., Ltd.      
Disclosure of associates [line items]      
Total assets 29,157 28,537  
Total liabilities 107,300 105,292  
Sales 0 0  
Profit (loss) for the period (50) (72)  
PT Wampu Electric Power      
Disclosure of associates [line items]      
Total assets 206,943 209,815  
Total liabilities 131,823 127,764  
Sales 20,155 21,773  
Profit (loss) for the period (582) 12,713  
PT. Bayan Resources TBK      
Disclosure of associates [line items]      
Total assets 4,447,335 4,994,538  
Total liabilities 2,018,870 2,518,129  
Sales 4,675,174 6,076,844  
Profit (loss) for the period 1,670,522 3,042,123  
S-Power Co., Ltd.      
Disclosure of associates [line items]      
Total assets 762,398 937,067  
Total liabilities 427,807 646,411  
Sales 1,012,050 1,091,425  
Profit (loss) for the period 44,730 37,104  
Pioneer Gas Power Limited      
Disclosure of associates [line items]      
Total assets 274,693 271,340  
Total liabilities 532,005 477,127  
Sales 551 0  
Profit (loss) for the period (49,745) (46,290)  
Eurasia Energy Holdings      
Disclosure of associates [line items]      
Total assets   648  
Total liabilities   1,156  
Sales   0  
Profit (loss) for the period   0  
Xe-Pian Xe-Namnoy Power Co., Ltd.      
Disclosure of associates [line items]      
Total assets 1,370,110 1,371,292  
Total liabilities 900,713 904,907  
Sales 171,978 174,693  
Profit (loss) for the period (5,674) 61,020  
PT. Mutiara Jawa      
Disclosure of associates [line items]      
Total assets 27,296 26,024  
Total liabilities 9,474 13,622  
Sales 16,160 15,421  
Profit (loss) for the period 7,999 4,912  
Samcheok Eco Materials Co., Ltd.      
Disclosure of associates [line items]      
Total assets 22,544 24,952  
Total liabilities 39,895 1,609  
Sales 8,028 11,907  
Profit (loss) for the period (1,776) (1,127)  
Noeul Green Energy Co., Ltd.      
Disclosure of associates [line items]      
Total assets 89,861 82,611  
Total liabilities 107,834 101,472  
Sales 24,017 23,493  
Profit (loss) for the period 920 (31,970)  
Goseong Green Power Co., Ltd.      
Disclosure of associates [line items]      
Total assets 5,374,233 5,518,258  
Total liabilities 4,372,531 4,516,607  
Sales 1,580,545 1,999,825  
Profit (loss) for the period 152 26,981  
Gangneung Eco Power Co., Ltd.      
Disclosure of associates [line items]      
Total assets 5,381,984 4,907,872  
Total liabilities 4,665,083 4,900,408  
Sales 1,419,436 435,755  
Profit (loss) for the period (7,388) (142,387)  
Shin Pyeongtaek Power Co., Ltd.      
Disclosure of associates [line items]      
Total assets 1,222,968 1,203,406  
Total liabilities 832,633 839,568  
Sales 1,040,219 957,062  
Profit (loss) for the period 201,635 100,554  
Haeng Bok Do Si Photovoltaic Power Co., Ltd.      
Disclosure of associates [line items]      
Total assets 1,618 1,788  
Total liabilities 573 802  
Sales 575 558  
Profit (loss) for the period 82 200  
Dongducheon Dream Power Co., Ltd.      
Disclosure of associates [line items]      
Total assets 1,337,529 1,521,089  
Total liabilities 1,042,681 1,219,018  
Sales 1,744,247 2,240,175  
Profit (loss) for the period (8,608) 43,072  
Jinbhuvish Power Generation Pvt. Ltd.      
Disclosure of associates [line items]      
Total assets 61,227 60,477  
Total liabilities 12,644 12,489  
Sales 0 0  
Profit (loss) for the period 0 0  
Daejung Offshore Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Total assets 5,277 5,350  
Total liabilities 2,094 2,013  
Sales 0 0  
Profit (loss) for the period (145) (228)  
GS Donghae Electric Power Co., Ltd.      
Disclosure of associates [line items]      
Total assets 1,932,098 2,130,287  
Total liabilities 1,170,085 1,365,156  
Sales 876,826 1,053,112  
Profit (loss) for the period 62,471 46,226  
Daegu Photovoltaic Co., Ltd.      
Disclosure of associates [line items]      
Total assets 14,140 13,254  
Total liabilities 4,471 3,431  
Sales 4,225 4,755  
Profit (loss) for the period 1,772 2,914  
Busan Green Energy Co., Ltd.      
Disclosure of associates [line items]      
Total assets 160,299 168,588  
Total liabilities 149,060 153,432  
Sales 69,108 72,290  
Profit (loss) for the period (3,920) (7,409)  
Gunsan Bio Energy Co., Ltd.      
Disclosure of associates [line items]      
Total assets   8,397  
Total liabilities   29,524  
Sales   0  
Profit (loss) for the period   (649)  
Hansuwon KNP Co., Ltd. (formerly, Korea Nuclear Partners Co., Ltd.)      
Disclosure of associates [line items]      
Total assets 3,063 1,887  
Total liabilities 899 368  
Sales 7,618 2,149  
Profit (loss) for the period 645 210  
Korea Electric Power Corporation Fund      
Disclosure of associates [line items]      
Total assets 23,981 29,530  
Total liabilities 108 130  
Sales 332 8,034  
Profit (loss) for the period (2,921) 7,854  
Energy Infra Asset Management Co., Ltd.      
Disclosure of associates [line items]      
Total assets 13,628 12,874  
Total liabilities 1,371 918  
Sales 5,130 4,954  
Profit (loss) for the period 1,254 1,354  
Daegu clean Energy Co., Ltd.      
Disclosure of associates [line items]      
Total assets 368 368  
Total liabilities 324 324  
Sales 0 0  
Profit (loss) for the period (1) (1)  
Yaksu ESS Co., Ltd.      
Disclosure of associates [line items]      
Total assets 5,697 5,984  
Total liabilities 4,717 4,314  
Sales 508 851  
Profit (loss) for the period (691) (146)  
Nepal Water & Energy Development Company Private Limited      
Disclosure of associates [line items]      
Total assets 327,057 241,061  
Total liabilities 167,792 141,199  
Sales 82,720 70,923  
Profit (loss) for the period (3,186) (1,364)  
Gwangyang Green Energy Co., Ltd.      
Disclosure of associates [line items]      
Total assets 370,778 170,390  
Total liabilities 247,675 45,260  
Sales 0 0  
Profit (loss) for the period (2,034) (1,923)  
PND Solar Co., Ltd.      
Disclosure of associates [line items]      
Total assets 34,804 36,174  
Total liabilities 30,127 31,868  
Sales 5,413 5,940  
Profit (loss) for the period 373 217  
Hyundai Eco Energy Co., Ltd.      
Disclosure of associates [line items]      
Total assets 169,180 181,566  
Total liabilities 128,481 142,533  
Sales 26,266 29,209  
Profit (loss) for the period 7,206 10,270  
YeongGwang Yaksu Wind Electric Co., Ltd.      
Disclosure of associates [line items]      
Total assets 38,720 40,712  
Total liabilities 38,173 39,924  
Sales 5,593 6,628  
Profit (loss) for the period (241) 1,480  
Green Energy Electricity Generation Co., Ltd.      
Disclosure of associates [line items]      
Total assets 69,667 75,033  
Total liabilities 72,325 72,300  
Sales 948 1,404  
Profit (loss) for the period (5,392) (488)  
Korea Energy Solutions Co., Ltd.      
Disclosure of associates [line items]      
Total assets 1,151 843  
Total liabilities 303 377  
Sales 643 437  
Profit (loss) for the period 87 (185)  
ITR Co., Ltd.      
Disclosure of associates [line items]      
Total assets 480 446  
Total liabilities 490 472  
Sales 144 188  
Profit (loss) for the period (234) (190)  
REC's Innovation Co., Ltd. (formerly, Wang San Engineering. Co,. Ltd.)      
Disclosure of associates [line items]      
Total assets 1,818 1,948  
Total liabilities 127 383  
Sales 771 732  
Profit (loss) for the period 178 202  
Namjeongsusang Solar Power Operation Co., Ltd.      
Disclosure of associates [line items]      
Total assets   55,616  
Total liabilities   53,261  
Sales   7,724  
Profit (loss) for the period   83  
Indeck Niles Development, LLC      
Disclosure of associates [line items]      
Total assets 1,157,838 1,178,303  
Total liabilities 675,638 762,139  
Sales 318,392 302,041  
Profit (loss) for the period 64,813 (22,541)  
Indeck Niles Asset Management, LLC      
Disclosure of associates [line items]      
Total assets 307 299  
Total liabilities 29 16  
Sales 1,081 1,863  
Profit (loss) for the period 1,001 1,136  
Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1      
Disclosure of associates [line items]      
Total assets 13,444 14,356  
Total liabilities 186 210  
Sales 820 826  
Profit (loss) for the period 747 796  
Suwon New Power Co., Ltd.      
Disclosure of associates [line items]      
Total assets 3,448 2,142  
Total liabilities 1,130 164  
Sales 2,318 0  
Profit (loss) for the period 341 11  
Gwangbaek Solar Power Investment Co., Ltd.      
Disclosure of associates [line items]      
Total assets 287,838 307,864  
Total liabilities 276,840 296,915  
Sales 11,267 10,270  
Profit (loss) for the period 1,513 743  
Go deok Clean Energy Co., Ltd      
Disclosure of associates [line items]      
Total assets 139,352 71,431  
Total liabilities 127,545 60,382  
Sales 22,671 0  
Profit (loss) for the period 2,426 (1,101)  
SureDataLab Co., Ltd.      
Disclosure of associates [line items]      
Total assets 890 879  
Total liabilities 416 140  
Sales 548 938  
Profit (loss) for the period (263) 203  
SEP Co., Ltd.      
Disclosure of associates [line items]      
Total assets 45 38  
Total liabilities 117 103  
Sales 0 0  
Profit (loss) for the period (7) (98)  
Hankook Electric Power Information Co., Ltd.      
Disclosure of associates [line items]      
Total assets 2,270 2,334  
Total liabilities 974 997  
Sales 1,672 1,797  
Profit (loss) for the period 223 392  
Tronix Co., Ltd.      
Disclosure of associates [line items]      
Total assets 4,564 2,880  
Total liabilities 2,807 2,354  
Sales 2,718 1,938  
Profit (loss) for the period 578 (226)  
O2&B Global Co., Ltd.      
Disclosure of associates [line items]      
Total assets 369 419  
Total liabilities 264 238  
Sales 242 220  
Profit (loss) for the period (73) 5  
Muan Sunshine Solar Power Plant Co., Ltd.      
Disclosure of associates [line items]      
Total assets 136,382 142,911  
Total liabilities 124,745 132,573  
Sales 16,360 19,591  
Profit (loss) for the period 2,999 6,467  
Bigeum Resident Photovoltaic Power Co., Ltd.      
Disclosure of associates [line items]      
Total assets 303,462 107,690  
Total liabilities 309,185 109,229  
Sales 0 0  
Profit (loss) for the period (3,031) (537)  
Goesan Solar Park Co., Ltd.      
Disclosure of associates [line items]      
Total assets 50,659 52,235  
Total liabilities 40,738 43,299  
Sales 6,530 7,642  
Profit (loss) for the period 985 2,292  
Saemangeum Heemang Photovoltaic Co., Ltd.      
Disclosure of associates [line items]      
Total assets 152,496 160,695  
Total liabilities 113,407 125,635  
Sales 23,448 29,543  
Profit (loss) for the period 4,063 6,481  
Bitgoel Eco Energy Co., Ltd.      
Disclosure of associates [line items]      
Total assets 85,571 85,236  
Total liabilities 60,302 66,987  
Sales 29,907 10,054  
Profit (loss) for the period 7,019 3,229  
Jeju Gimnyeong Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Total assets 56,906 63,471  
Total liabilities 56,087 60,564  
Sales 9,261 12,231  
Profit (loss) for the period (2,088) (130)  
Seoroseoro Sunny Power Plant Co., Ltd.      
Disclosure of associates [line items]      
Total assets 6,813 7,015  
Total liabilities 4,650 5,045  
Sales 1,039 1,157  
Profit (loss) for the period 193 247  
Muan Solar park Co., Ltd.      
Disclosure of associates [line items]      
Total assets 204,168 225,894  
Total liabilities 171,642 188,329  
Sales 31,532 36,081  
Profit (loss) for the period 8,648 11,339  
YuDang Solar Co., Ltd.      
Disclosure of associates [line items]      
Total assets 20,566 22,073  
Total liabilities 17,717 19,144  
Sales 3,483 3,997  
Profit (loss) for the period 420 957  
Anjwa Smart Farm & Solar City Co., Ltd.      
Disclosure of associates [line items]      
Total assets 258,076 278,806  
Total liabilities 223,831 239,581  
Sales 37,742 42,477  
Profit (loss) for the period 3,119 9,672  
Daewon Green Energy Co., Ltd.      
Disclosure of associates [line items]      
Total assets 143,157 141,974  
Total liabilities 112,651 124,460  
Sales 58,423 45,095  
Profit (loss) for the period 13,407 4,037  
G.GURU Co., Ltd.      
Disclosure of associates [line items]      
Total assets 818 1,228  
Total liabilities 142 12  
Sales 162 478  
Profit (loss) for the period (540) (423)  
UD4M Co., Ltd.      
Disclosure of associates [line items]      
Total assets 1,242 1,322  
Total liabilities 194 197  
Sales 1,066 1,109  
Profit (loss) for the period (59) 59  
Dongbu Highway Solar Co., Ltd.      
Disclosure of associates [line items]      
Total assets 16,563 17,935  
Total liabilities 14,913 16,426  
Sales 2,580 2,901  
Profit (loss) for the period 140 439  
Seobu Highway Solar Co., Ltd.      
Disclosure of associates [line items]      
Total assets 16,739 18,236  
Total liabilities 14,707 16,655  
Sales 2,646 3,052  
Profit (loss) for the period 451 138  
Korea Energy Data Co., Ltd.      
Disclosure of associates [line items]      
Total assets 313 339  
Total liabilities 191 128  
Sales 348 308  
Profit (loss) for the period (87) 5  
Gangneung Sacheon Fuel Cell Co., Ltd.      
Disclosure of associates [line items]      
Total assets 138,761 108,688  
Total liabilities 119,779 98,470  
Sales 23,523 0  
Profit (loss) for the period 9,191 (2,720)  
KOSTURE Co., Ltd.      
Disclosure of associates [line items]      
Total assets 196 180  
Total liabilities 22 24  
Sales 208 293  
Profit (loss) for the period 16 32  
Taebaek Gadeoksan Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Total assets 196,810 197,944  
Total liabilities 139,675 139,004  
Sales 35,000 31,534  
Profit (loss) for the period 13,138 19,406  
Chuncheon Green Energy Co., Ltd.      
Disclosure of associates [line items]      
Total assets 217,335 159,151  
Total liabilities 197,676 138,925  
Sales 6,052 0  
Profit (loss) for the period (497) (858)  
Yeomsubong Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Total assets 32,742 4,369  
Total liabilities 30,586 2,829  
Sales 0 0  
Profit (loss) for the period (1,753) (859)  
Yeongyang Wind Power Corporation II      
Disclosure of associates [line items]      
Total assets 133,053 104,821  
Total liabilities 106,419 86,984  
Sales 15,190 0  
Profit (loss) for the period 8,797 (1,678)  
Haeparang Energy Co., Ltd.      
Disclosure of associates [line items]      
Total assets 40,698 19,394  
Total liabilities 32,359 10,721  
Sales 0 0  
Profit (loss) for the period (335) (211)  
Saemangeum Sebit Power Plant Co., Ltd.      
Disclosure of associates [line items]      
Total assets 165,283 167,822  
Total liabilities 97,997 131,383  
Sales 22,663 23,159  
Profit (loss) for the period (812) 7,742  
Boulder Solar III, LLC      
Disclosure of associates [line items]      
Total assets 1,929 1,896  
Total liabilities 0 0  
Sales 0 0  
Profit (loss) for the period 0 0  
PlatformN. Co., Ltd      
Disclosure of associates [line items]      
Total assets 184 379  
Total liabilities 394 94  
Sales 404 486  
Profit (loss) for the period (566) (70)  
PT. Cirebon Energi Prasarana      
Disclosure of associates [line items]      
Total assets 3,372,539 3,361,288  
Total liabilities 2,606,566 2,670,941  
Sales 434,806 319,986  
Profit (loss) for the period 73,285 36,451  
Green Radiation Co., Ltd      
Disclosure of associates [line items]      
Total assets 1,038 111  
Total liabilities 812 34  
Sales 298 89  
Profit (loss) for the period 100 (93)  
Future Convergence Technology Laboratory. Co., Ltd      
Disclosure of associates [line items]      
Total assets 479 551  
Total liabilities 302 302  
Sales 0 9  
Profit (loss) for the period (70) (130)  
SC E&G. Co,. Ltd      
Disclosure of associates [line items]      
Total assets 1,664 1,199  
Total liabilities 329 131  
Sales 633 1,048  
Profit (loss) for the period 372 609  
STN Co., Ltd. (formerly, Structure test network Co., Ltd.)      
Disclosure of associates [line items]      
Total assets 1,801 1,275  
Total liabilities 1,081 447  
Sales 856 754  
Profit (loss) for the period 0 499  
ACE      
Disclosure of associates [line items]      
Total assets 385 100  
Total liabilities 348 0  
Sales 53 0  
Profit (loss) for the period (30) 0  
Environment and Energy Co., Ltd      
Disclosure of associates [line items]      
Total assets 89 93  
Total liabilities 0 0  
Sales 0 0  
Profit (loss) for the period (4) (7)  
Santiago Solar Power SpA      
Disclosure of associates [line items]      
Total assets 88,687 56,138  
Total liabilities 65,149 29,390  
Sales 0 0  
Profit (loss) for the period (2,994) (2,943)  
Yanggu Floating Photovoltaic Power Plant Inc      
Disclosure of associates [line items]      
Total assets 17,092 3,115  
Total liabilities 14,470 0  
Sales 135 0  
Profit (loss) for the period (495) ₩ 0  
Power Embedded      
Disclosure of associates [line items]      
Total assets 298    
Total liabilities 2    
Sales 0    
Profit (loss) for the period (2)    
Changwon SG Energy Co., Ltd.      
Disclosure of associates [line items]      
Total assets 5,738    
Total liabilities 1,649    
Sales 436    
Profit (loss) for the period (703)    
Donpyung Technology. Co., Ltd.      
Disclosure of associates [line items]      
Total assets 2,039    
Total liabilities 643    
Sales 1,664    
Profit (loss) for the period 93    
HORANG ENERGY Inc.      
Disclosure of associates [line items]      
Total assets 64,736    
Total liabilities 54,923    
Sales 0    
Profit (loss) for the period (389)    
Hoenggye Renewable Energy Co., Ltd      
Disclosure of associates [line items]      
Total assets 24,702    
Total liabilities 25,730    
Sales 0    
Profit (loss) for the period (4,864)    
Haman Green Energy Co., Ltd.      
Disclosure of associates [line items]      
Total assets 40,801    
Total liabilities 32,285    
Sales 0    
Profit (loss) for the period (5,116)    
Songsan Green Energy Co., Ltd.      
Disclosure of associates [line items]      
Total assets 46,016    
Total liabilities 32,262    
Sales 0    
Profit (loss) for the period ₩ (100)