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Consolidated Subsidiaries - Summary of Financial Information of Consolidated Subsidiaries (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure - Summary of financial information of consolidated subsidiaries [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 Hydro & Nuclear Power Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 70,535,018 69,129,625  
Total liabilities 45,660,916 42,843,974  
Sales 10,798,378 10,386,091  
Profit (loss) for the period 151,638 (16,382)  
Korea South-East Power Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 13,158,245 13,855,071  
Total liabilities 6,964,695 7,410,881  
Sales 7,761,713 8,972,991  
Profit (loss) for the period 196,522 71,662  
Korea Midland Power Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 15,309,205 16,062,605  
Total liabilities 10,368,698 10,776,943  
Sales 7,611,821 8,629,165  
Profit (loss) for the period (1,844) (58,173)  
Korea Western Power Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 12,710,246 13,459,054  
Total liabilities 7,648,441 8,125,312  
Sales 6,915,233 8,112,727  
Profit (loss) for the period 126,519 106,361  
Korea Southern Power Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 13,405,076 14,011,354  
Total liabilities 7,807,334 8,296,983  
Sales 7,298,989 9,304,362  
Profit (loss) for the period 226,811 (68,315)  
Korea East-West Power Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 11,683,112 12,079,954  
Total liabilities 5,626,034 5,818,789  
Sales 5,571,885 6,925,094  
Profit (loss) for the period 139,013 2,888  
KEPCO Engineering & Construction Company, Inc.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 854,704 815,533  
Total liabilities 307,396 272,119  
Sales 545,092 505,291  
Profit (loss) for the period 32,654 17,954  
KEPCO Plant Service & Engineering Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 1,585,380 1,555,453  
Total liabilities 318,597 344,702  
Sales 1,523,031 1,425,913  
Profit (loss) for the period 161,849 97,881  
KEPCO Nuclear Fuel Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 1,101,960 949,455  
Total liabilities 622,157 490,215  
Sales 284,066 304,405  
Profit (loss) for the period 43,533 31,508  
KEPCO KDN Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 733,434 734,439  
Total liabilities 301,713 166,272  
Sales 738,833 739,453  
Profit (loss) for the period 65,495 42,584  
KEPCO International HongKong Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 133,915 128,784  
Total liabilities 0 0  
Sales 0 0  
Profit (loss) for the period 8,795 (216)  
KEPCO International Philippines Inc.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 72,830 127,744  
Total liabilities 0 101  
Sales 0 0  
Profit (loss) for the period 4,891 9,976  
KEPCO Gansu International Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 7,226 7,125  
Total liabilities 608 598  
Sales 0 0  
Profit (loss) for the period (23) (22)  
KEPCO Philippines Holdings Inc.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 180,592 191,634  
Total liabilities 96 129  
Sales 0 0  
Profit (loss) for the period 8,802 39,346  
KEPCO Philippines Corporation      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 2,607 3,799  
Total liabilities 0 14  
Sales 0 0  
Profit (loss) for the period 127 102  
KEPCO Ilijan Corporation      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 142,711 231,132  
Total liabilities 800 3,642  
Sales 0 23,263  
Profit (loss) for the period 3,718 16,455  
KEPCO Lebanon SARL      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets   1,890  
Total liabilities   10,482  
Sales   0  
Profit (loss) for the period   20  
KEPCO Neimenggu International Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 284,280 269,582  
Total liabilities 4,346 3,917  
Sales 0 0  
Profit (loss) for the period 15,021 9,938  
KEPCO Shanxi International Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 707,447 597,635  
Total liabilities 329,539 222,186  
Sales 0 0  
Profit (loss) for the period (3,875) (11,312)  
KOMIPO Global Pte Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 411,249 388,071  
Total liabilities 32,900 1,817  
Sales 0 0  
Profit (loss) for the period 17,174 58,030  
KEPCO Netherlands B.V.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 141,088 137,454  
Total liabilities 45 64  
Sales 0 0  
Profit (loss) for the period 3,856 8,570  
KEPCO Australia Pty., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 749 579  
Total liabilities 34 11  
Sales 0 0  
Profit (loss) for the period 131 102  
KOSEP Australia Pty., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 79,308 74,180  
Total liabilities 7,990 13,097  
Sales 29,675 52,271  
Profit (loss) for the period 10,665 24,443  
KOMIPO Australia Pty., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 86,077 81,216  
Total liabilities 4,014 10,327  
Sales 29,676 52,272  
Profit (loss) for the period 9,248 23,368  
KOWEPO Australia Pty., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 86,074 81,696  
Total liabilities 3,571 10,184  
Sales 29,675 52,271  
Profit (loss) for the period 9,001 22,745  
KOSPO Australia Pty., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 32,828 41,872  
Total liabilities 3,923 10,174  
Sales 29,675 52,271  
Profit (loss) for the period 10,329 24,362  
KEPCO Middle East Holding Company      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 121,015 116,731  
Total liabilities 107,611 102,054  
Sales 0 0  
Profit (loss) for the period (1,548) (634)  
Qatrana Electric Power Company      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 491,627 513,277  
Total liabilities 208,707 247,027  
Sales 26,779 24,354  
Profit (loss) for the period 20,949 22,578  
KHNP Canada Energy Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 155,242 107,200  
Total liabilities 12,379 6,218  
Sales 0 0  
Profit (loss) for the period 392 149  
KEPCO Bylong Australia Pty., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 44,557 44,034  
Total liabilities 465,231 437,852  
Sales 0 0  
Profit (loss) for the period (16,669) (45,880)  
Korea Waterbury Uranium Limited Partnership      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 20,772 20,934  
Total liabilities 44 224  
Sales 0 0  
Profit (loss) for the period (67) (116)  
KEPCO Holdings de Mexico      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 1,171 728  
Total liabilities 2,621 1,974  
Sales 0 0  
Profit (loss) for the period (121) (1,363)  
KST Electric Power Company, S.A.P.I. de C.V.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 631,348 653,830  
Total liabilities 490,470 528,315  
Sales 93,843 232,893  
Profit (loss) for the period 19,657 23,122  
KEPCO Energy Service Company      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 2,028 2,238  
Total liabilities 716 2,173  
Sales 10,193 7,015  
Profit (loss) for the period 251 (211)  
KEPCO Netherlands S3 B.V.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 70,613 71,326  
Total liabilities 16,710 16,419  
Sales 0 0  
Profit (loss) for the period 1,769 4,465  
PT. KOMIPO Pembangkitan Jawa Bali      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 17,303 15,753  
Total liabilities 3,929 3,232  
Sales 23,639 22,488  
Profit (loss) for the period 1,579 3,668  
PT. Cirebon Power Service      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 2,936 2,316  
Total liabilities 714 784  
Sales 9,457 9,602  
Profit (loss) for the period 672 355  
KOWEPO International Corporation      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 0 0  
Total liabilities 10 10  
Sales 0 0  
Profit (loss) for the period 0 0  
KOSPO Jordan LLC      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 19,387 22,854  
Total liabilities 3,881 6,964  
Sales 17,665 45,009  
Profit (loss) for the period 7,082 7,657  
EWP America Inc.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 46,954 47,775  
Total liabilities 4,032 2,595  
Sales 14,549 21,717  
Profit (loss) for the period 895 4,337  
KNF Canada Energy Limited      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 2,261 2,116  
Total liabilities 34 34  
Sales 0 0  
Profit (loss) for the period (56) (59)  
EWP Barbados 1 SRL      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 434,690 395,067  
Total liabilities 14,217 901  
Sales 2,448 3,230  
Profit (loss) for the period 36,566 34,260  
Gyeonggi Green Energy Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 180,176 220,414  
Total liabilities 214,822 226,517  
Sales 80,630 112,524  
Profit (loss) for the period (28,549) (26,004)  
PT. Tanggamus Electric Power      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 214,892 227,638  
Total liabilities 150,483 163,106  
Sales 2,127 3,781  
Profit (loss) for the period (2,230) 5,778  
Gyeongju Wind Power Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 90,616 98,513  
Total liabilities 49,982 55,579  
Sales 19,807 24,888  
Profit (loss) for the period 6,716 9,711  
KOMIPO America Inc.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 579,403 571,200  
Total liabilities 318,295 317,903  
Sales 39,323 34,059  
Profit (loss) for the period 3,376 (3,293)  
PT. EWP Indonesia      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 90,650 93,390  
Total liabilities 132 5  
Sales 0 0  
Profit (loss) for the period 9,590 4,100  
KEPCO Netherlands J3 B.V.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 153,324 135,213  
Total liabilities 13,634 63  
Sales 0 0  
Profit (loss) for the period 15,289 19,396  
Korea Offshore Wind Power Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 334,444 376,449  
Total liabilities 143,827 192,335  
Sales 40,313 52,526  
Profit (loss) for the period 6,497 13,083  
Global One Pioneer B.V.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 143 135  
Total liabilities 44 41  
Sales 0 0  
Profit (loss) for the period (85) (68)  
Global Energy Pioneer B.V.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 336 320  
Total liabilities 44 40  
Sales 0 0  
Profit (loss) for the period (81) (64)  
Mira Power Limited      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 403,843 416,750  
Total liabilities 318,557 310,529  
Sales 2,683 57,135  
Profit (loss) for the period (1,590) 12,394  
KOSEP Material Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 4,974 3,985  
Total liabilities 542 662  
Sales 4,834 4,589  
Profit (loss) for the period 908 775  
Commerce and Industry Energy Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 73,671 79,172  
Total liabilities 29,611 32,147  
Sales 33,050 31,068  
Profit (loss) for the period (2,901) (3,730)  
KEPCO KPS Philippines Corp.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 5,775 5,294  
Total liabilities 884 600  
Sales 4,608 5,232  
Profit (loss) for the period 97 1,004  
KOSPO Chile SpA      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 166,643 159,500  
Total liabilities 75,619 70,037  
Sales 0 0  
Profit (loss) for the period 0 (2,811)  
PT. KOWEPO Sumsel Operation and Maintenance Services      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 26 25  
Total liabilities 260 252  
Sales 0 0  
Profit (loss) for the period 0 (94)  
Hee Mang Sunlight Power Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 5,877 5,877  
Total liabilities 2,403 2,606  
Sales 689 862  
Profit (loss) for the period 202 304  
Fujeij Wind Power Company      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 216,082 213,113  
Total liabilities 158,081 163,690  
Sales 0 0  
Profit (loss) for the period 15,067 16,564  
KOSPO Youngnam Power Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 360,026 425,000  
Total liabilities 255,761 312,831  
Sales 410,173 568,224  
Profit (loss) for the period (7,965) 10,878  
Chitose Solar Power Plant LLC      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 98,911 109,964  
Total liabilities 84,228 94,366  
Sales 14,447 14,384  
Profit (loss) for the period 2,059 1,615  
KEPCO Energy Solution Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 322,529 317,392  
Total liabilities 15,367 6,147  
Sales 14,151 33,638  
Profit (loss) for the period 5,384 138  
KEPCO Solar Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 246,273 243,221  
Total liabilities 36,127 25,405  
Sales 23,234 24,778  
Profit (loss) for the period 8,367 9,305  
KOSPO Power Services Ltda.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 6,976 6,722  
Total liabilities 7,086 4,762  
Sales 17,634 17,911  
Profit (loss) for the period (211) (358)  
Energy New Industry Specialized Investment Private Investment Trust      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 454,888 451,762  
Total liabilities 3,364 4,338  
Sales 24,030 24,725  
Profit (loss) for the period 10,812 7,093  
KOEN Bylong Pty., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 11 11  
Total liabilities 128 119  
Sales 0 0  
Profit (loss) for the period 0 (12)  
KOMIPO Bylong Pty., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 13 11  
Total liabilities 147 122  
Sales 0 0  
Profit (loss) for the period (20) (33)  
KOWEPO Bylong Pty., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 12 8  
Total liabilities 142 94  
Sales 0 0  
Profit (loss) for the period (43) (7)  
KOSPO Bylong Pty., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 388 25  
Total liabilities 541 148  
Sales 0 0  
Profit (loss) for the period (20) (17)  
EWP Bylong Pty., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 13 8  
Total liabilities 13 54  
Sales 0 0  
Profit (loss) for the period 46 1  
KOWEPO Lao International      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 13,038 8,248  
Total liabilities 223 87  
Sales 10,270 10,010  
Profit (loss) for the period 6,268 11,185  
KEPCO US Inc.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets   91  
Total liabilities   0  
Sales   0  
Profit (loss) for the period   (19,181)  
KEPCO Mangilao Holdings LLC      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 90,445 112,948  
Total liabilities 41,898 40,558  
Sales 775 21,743  
Profit (loss) for the period 785 21,166  
Mangilao Investment LLC      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 206,714 258,674  
Total liabilities 15 4  
Sales 0 0  
Profit (loss) for the period (1) (1)  
KEPCO Mangilao Solar, LLC      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 206,600 240,736  
Total liabilities 1,918 373  
Sales 13,593 8,870  
Profit (loss) for the period 826 (14,818)  
Jeju Hanlim Offshore Wind Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 459,229 185,357  
Total liabilities 388,171 111,343  
Sales 0 0  
Profit (loss) for the period (3,032) (3,546)  
PT. Siborpa Eco Power      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 12,209 12,050  
Total liabilities 3 3  
Sales 0 0  
Profit (loss) for the period (52) (39)  
PT. Korea Energy Indonesia      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 1,878 1,675  
Total liabilities 101 80  
Sales 1,897 1,937  
Profit (loss) for the period 132 (104)  
KOLAT SpA      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 46,958 48,787  
Total liabilities 352 3,701  
Sales 2,237 1,647  
Profit (loss) for the period 1,820 1,888  
KEPCO California, LLC      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 46,606 46,151  
Total liabilities 6,823 4,768  
Sales 613 596  
Profit (loss) for the period (385) (670)  
KEPCO Mojave Holdings, LLC      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 93,233 95,550  
Total liabilities 78,328 75,846  
Sales 0 0  
Profit (loss) for the period (3,901) (4,705)  
Incheon Fuel Cell Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 259,169 268,063  
Total liabilities 237,409 242,176  
Sales 96,924 107,193  
Profit (loss) for the period (4,112) (5,323)  
KOEN Service Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 11,470 9,353  
Total liabilities 8,745 7,035  
Sales 38,164 36,340  
Profit (loss) for the period 305 356  
KOMIPO Service Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 7,944 6,597  
Total liabilities 4,777 4,503  
Sales 37,525 35,031  
Profit (loss) for the period 960 905  
KOWEPO Service Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 10,300 6,266  
Total liabilities 6,584 3,130  
Sales 36,421 34,031  
Profit (loss) for the period 264 171  
KOSPO Service Co., Ltd      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 6,122 6,672  
Total liabilities 4,182 5,048  
Sales 30,369 28,321  
Profit (loss) for the period 703 60  
EWP Service Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 5,487 3,756  
Total liabilities 3,790 2,507  
Sales 26,767 24,526  
Profit (loss) for the period 176 581  
PT. KOMIPO Energy Indonesia      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 2,983 2,978  
Total liabilities 250 368  
Sales 2,023 1,698  
Profit (loss) for the period 38 83  
KNF Partners Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 2,589 2,285  
Total liabilities 1,106 1,053  
Sales 6,380 5,997  
Profit (loss) for the period 340 293  
KOSPO USA Inc.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 378,732 315,018  
Total liabilities 377 430  
Sales 0 0  
Profit (loss) for the period (6,351) 5,024  
Nambu USA LLC      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 297,370 297,516  
Total liabilities 230 0  
Sales 0 0  
Profit (loss) for the period (732) 670  
Tamra Offshore Wind Power Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 120,460 133,598  
Total liabilities 83,161 93,639  
Sales 18,570 18,332  
Profit (loss) for the period 1,089 5,316  
KEPCO MCS Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 111,189 114,316  
Total liabilities 73,940 52,241  
Sales 307,146 363,627  
Profit (loss) for the period (4,757) 8,468  
KEPCO FMS Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 21,310 16,852  
Total liabilities 18,142 11,667  
Sales 107,336 105,339  
Profit (loss) for the period 1,895 2,176  
Firstkeepers Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 18,698 16,448  
Total liabilities 12,437 12,912  
Sales 90,575 84,620  
Profit (loss) for the period 2,689 2,482  
Secutec Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 16,038 12,578  
Total liabilities 11,797 9,209  
Sales 72,284 69,383  
Profit (loss) for the period 699 690  
SE Green Energy Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 147,251 149,189  
Total liabilities 114,737 114,241  
Sales 40,326 49,873  
Profit (loss) for the period (1,305) 1,304  
Mangilao Intermediate Holdings LLC      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 206,771 236,266  
Total liabilities 114,954 116,426  
Sales 0 0  
Profit (loss) for the period (5,293) (4,709)  
KEPCO CSC Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 15,985 10,668  
Total liabilities 12,170 8,937  
Sales 49,502 46,559  
Profit (loss) for the period 2,644 (2,134)  
KOAK Power Limited      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 15,000 12,626  
Total liabilities 528 839  
Sales 0 0  
Profit (loss) for the period 714 49  
KOMIPO Europe B.V.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 86,109 81,364  
Total liabilities 69 54  
Sales 1,183 1,195  
Profit (loss) for the period 109 1,134  
Haenanum Energy Fund      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 7,415 7,416  
Total liabilities 3 3  
Sales 47 0  
Profit (loss) for the period (1) (48)  
Paju Ecoenergy Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 60,653 61,930  
Total liabilities 2,146 3,066  
Sales 15,351 20,718  
Profit (loss) for the period (357) 1,290  
Guam Ukudu Power LLC      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 749,837 293,422  
Total liabilities 720,795 323,292  
Sales 0 0  
Profit (loss) for the period (19,904) (31,410)  
K-SOLAR SHINAN Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 298,866 320,227  
Total liabilities 281,676 296,141  
Sales 37,137 16,980  
Profit (loss) for the period (6,896) 3,690  
KPS Partners Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 3,503 3,619  
Total liabilities 1,776 2,007  
Sales 12,921 12,417  
Profit (loss) for the period 183 487  
KEPCO E&C Service Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 7,167 5,676  
Total liabilities 1,938 1,897  
Sales 16,454 16,180  
Profit (loss) for the period 1,505 1,493  
Moha Solar Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 27,213 29,096  
Total liabilities 29,363 31,359  
Sales 0 169  
Profit (loss) for the period 112 (1,137)  
Ogiri Solar Power Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 1,032 1,033  
Total liabilities 31 23  
Sales 0 0  
Profit (loss) for the period (9) (30)  
KHNP USA LLC      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 1,517 1,290  
Total liabilities 140 97  
Sales 1,142 1,127  
Profit (loss) for the period 166 392  
KOMIPO Vanphong Power Service LLC      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 26,819 15,940  
Total liabilities 3,768 3,333  
Sales 21,396 20,233  
Profit (loss) for the period 10,879 9,871  
Energy Innovation Fund I      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 43,725 35,310  
Total liabilities 419 445  
Sales 0 0  
Profit (loss) for the period (766) (961)  
KHNP Chile SpA      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 5,555 5,547  
Total liabilities 4,219 4,147  
Sales 0 0  
Profit (loss) for the period (66) (16)  
Yeong Yang Apollon Photovoltaic Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 1,529 1,566  
Total liabilities 1,427 1,507  
Sales 219 254  
Profit (loss) for the period 42 (82)  
Yeong Yang Corporation Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 1,519 1,559  
Total liabilities 1,418 1,497  
Sales 216 251  
Profit (loss) for the period 39 (91)  
SolarVader Co., Ltd      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 1,529 1,568  
Total liabilities 1,421 1,500  
Sales 219 256  
Profit (loss) for the period 40 (78)  
Yeong Yang Innovation Co., Ltd      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 1,510 1,557  
Total liabilities 1,418 1,497  
Sales 210 244  
Profit (loss) for the period 32 (91)  
Yeong Yang Horus Photovoltaic Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 1,502 1,552  
Total liabilities 1,418 1,498  
Sales 206 243  
Profit (loss) for the period 28 (93)  
Yeong Yang Solar Management Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 1,540 1,573  
Total liabilities 1,420 1,500  
Sales 224 262  
Profit (loss) for the period 46 (75)  
LSG Hydro Power Limited      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 717 1,144  
Total liabilities 8 1,159  
Sales 0 0  
Profit (loss) for the period (219) (18)  
KOEN Bio Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 1,010 261  
Total liabilities 585 219  
Sales 2,467 639  
Profit (loss) for the period 372 (150)  
KOMIPO Iberian Solar Group, S.L.U.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 79,666 78,094  
Total liabilities 66,874 65,012  
Sales 0 0  
Profit (loss) for the period (931) (1,304)  
Jeongam Wind Power Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 75,744 81,800  
Total liabilities 63,219 68,317  
Sales 8,154 10,722  
Profit (loss) for the period (958) 892  
KOWEPO Europe B.V.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 107 42,865  
Total liabilities 3,177 2,422  
Sales 0 0  
Profit (loss) for the period (44,685) 1,668  
Yeongdeok Sunrise Wind Power Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 94,615 42,187  
Total liabilities 74,842 22,031  
Sales 0 0  
Profit (loss) for the period (383) (328)  
KHNP Spain, S.L.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets   3  
Total liabilities   0  
Sales   0  
Profit (loss) for the period   (1)  
KA Power Limited      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 3,173 3,937  
Total liabilities 172 418  
Sales 0 0  
Profit (loss) for the period 126 442  
Western Power Changgi Solar Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 46,950 48,770  
Total liabilities 40,815 44,647  
Sales 7,036 3,447  
Profit (loss) for the period 2,011 (354)  
EWP Australia Pty., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 52,734 51,105  
Total liabilities 0 0  
Sales 325 0  
Profit (loss) for the period 337 15,203  
Columboola Solar Farm Hold Co Pty., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 311,259 310,271  
Total liabilities 213,822 214,792  
Sales 10,072 2,228  
Profit (loss) for the period 3,217 2,884  
Digital Innovation Growth Fund      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 11,624 12,594  
Total liabilities 96 100  
Sales 0 0  
Profit (loss) for the period (266) (363)  
J Wind First, LLC      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 52,304 33,611  
Total liabilities 52,304 33,611  
Sales 2,540 450  
Profit (loss) for the period 0 0  
KEPCO Holding Company      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 3,307 3,273  
Total liabilities 0 17  
Sales 0 0  
Profit (loss) for the period (23) (18)  
KEPCO for Power Company      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets   57,501  
Total liabilities   58,441  
Sales   0  
Profit (loss) for the period   (960)  
KEPCO for Maintenance Company      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 118 0  
Total liabilities 0 0  
Sales 0 0  
Profit (loss) for the period (45) 0  
KOSPO Trumbull LLC      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 25 37  
Total liabilities 0 3  
Sales 0 0  
Profit (loss) for the period (10) 0  
Changjuk Wind Power Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 24,364 29,208  
Total liabilities 3,049 3,137  
Sales 6,230 9,027  
Profit (loss) for the period 744 ₩ 3,503  
Chile Solar JV SpA      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 98,705    
Total liabilities 75,472    
Sales 9,050    
Profit (loss) for the period (2,768)    
KEPCO KPS South Africa Pty., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 9,222    
Total liabilities 4,236    
Sales 8,512    
Profit (loss) for the period 834    
KOWEPO Holding Limited      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 1,323    
Total liabilities 1,371    
Sales 0    
Profit (loss) for the period ₩ (49)