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Consolidated Subsidiaries - Summary of Financial Information of Consolidated Subsidiaries (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Korea Hydro & Nuclear Power Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets ₩ 64,638,690 ₩ 61,859,753
Total liabilities 38,361,337 35,652,467
Sales 9,324,391 9,938,941
Profit (loss) for the year 302,232 647,641
Korea South-East Power Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 11,487,325 10,858,645
Total liabilities 6,510,826 5,954,129
Sales 5,188,856 4,258,904
Profit (loss) for the year (58,096) (139,149)
Korea Midland Power Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 13,756,040 13,028,436
Total liabilities 9,912,907 9,357,603
Sales 5,263,302 4,293,364
Profit (loss) for the year 54,869 (29,880)
Korea Western Power Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 10,822,780 10,357,023
Total liabilities 7,116,671 6,594,779
Sales 4,970,805 3,605,986
Profit (loss) for the year (171,562) (108,953)
Korea Southern Power Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 11,350,984 10,658,015
Total liabilities 7,099,881 6,411,524
Sales 5,671,989 4,015,941
Profit (loss) for the year (113,352) (17,588)
Korea East-West Power Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 9,895,739 9,619,485
Total liabilities 5,163,005 4,974,645
Sales 4,743,030 4,155,416
Profit (loss) for the year 10,872 (65,427)
KEPCO Engineering & Construction Company, Inc.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 705,043 699,244
Total liabilities 191,592 200,169
Sales 433,127 431,723
Profit (loss) for the year 16,452 20,160
KEPCO Plant Service & Engineering Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,420,705 1,345,857
Total liabilities 311,607 296,515
Sales 1,375,668 1,299,186
Profit (loss) for the year 98,132 85,916
KEPCO Nuclear Fuel Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 837,249 798,368
Total liabilities 405,614 390,155
Sales 323,729 331,228
Profit (loss) for the year 25,799 14,542
KEPCO KDN Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 721,634 647,496
Total liabilities 189,242 174,192
Sales 673,261 641,308
Profit (loss) for the year 67,244 45,207
KEPCO International HongKong Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 128,968 120,213
Total liabilities 0 0
Sales 0 0
Profit (loss) for the year 341 1,571
KEPCO International Philippines Inc.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 154,317 133,215
Total liabilities 482 366
Sales 0 0
Profit (loss) for the year 8,766 35,182
KEPCO Gansu International Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 7,151 7,753
Total liabilities 559 512
Sales 0 0
Profit (loss) for the year (25) (19)
KEPCO Philippines Holdings Inc.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 191,757 187,375
Total liabilities 128 127
Sales 0 0
Profit (loss) for the year 60,192 65,792
KEPCO Philippines Corporation    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 6,122 6,173
Total liabilities 19 17
Sales 0 0
Profit (loss) for the year (68) (187)
KEPCO Ilijan Corporation    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 259,069 322,066
Total liabilities 38,555 47,234
Sales 60,532 81,400
Profit (loss) for the year 12,981 39,443
KEPCO Lebanon SARL    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,729 1,669
Total liabilities 9,794 9,195
Sales 0 0
Profit (loss) for the year (86) (59)
KEPCO Neimenggu International Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 241,299 213,444
Total liabilities 3,106 2,492
Sales 0 0
Profit (loss) for the year 16,762 26,593
KEPCO Shanxi International Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 551,407 508,363
Total liabilities 207,844 196,408
Sales 0 0
Profit (loss) for the year 3,526 2,278
KOMIPO Global Pte Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 302,340 263,378
Total liabilities 1,351 656
Sales 0 0
Profit (loss) for the year 11,462 12,460
KEPCO Netherlands B.V.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 133,610 117,449
Total liabilities 866 71
Sales 0 0
Profit (loss) for the year 5,395 14,503
KOREA Imouraren Uranium Investment Corp.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 83 13,955
Total liabilities 0 123
Sales 0 0
Profit (loss) for the year (13,898) (675)
KEPCO Australia Pty., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 481 451
Total liabilities 11 17
Sales 0 0
Profit (loss) for the year 25 71
KOSEP Australia Pty., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 44,798 34,249
Total liabilities 5,561 3,500
Sales 22,013 14,327
Profit (loss) for the year 8,268 2,150
KOMIPO Australia Pty., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 54,162 45,250
Total liabilities 5,648 3,782
Sales 22,013 14,327
Profit (loss) for the year 5,942 2,685
KOWEPO Australia Pty., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 54,564 44,270
Total liabilities 4,766 2,909
Sales 22,013 14,327
Profit (loss) for the year 7,387 1,663
KOSPO Australia Pty., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 43,886 38,341
Total liabilities 4,502 2,750
Sales 22,013 14,327
Profit (loss) for the year 5,940 2,242
KEPCO Middle East Holding Company    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 104,068 90,601
Total liabilities 89,756 78,553
Sales 0 0
Profit (loss) for the year 1,144 (1,539)
Qatrana Electric Power Company    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 480,809 464,507
Total liabilities 262,725 287,859
Sales 21,368 21,279
Profit (loss) for the year 19,156 24,717
KHNP Canada Energy, Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 109,326 63,794
Total liabilities 25 26
Sales 0 0
Profit (loss) for the year 29 (7)
KEPCO Bylong Australia Pty., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 44,319 44,691
Total liabilities 394,349 349,542
Sales 0 0
Profit (loss) for the year (37,065) 16,897
Korea Waterbury Uranium Limited Partnership    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 20,920 20,908
Total liabilities 159 165
Sales 0 0
Profit (loss) for the year (57) (76)
KEPCO Holdings de Mexico    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 148 148
Total liabilities 27 27
Sales 0 0
Profit (loss) for the year (8) (14)
KST Electric Power Company, S.A.P.I. de C.V.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 584,625 531,367
Total liabilities 435,796 410,743
Sales 151,467 65,695
Profit (loss) for the year 18,499 37,899
KEPCO Energy Service Company    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 2,500 2,255
Total liabilities 956 994
Sales 12,070 5,880
Profit (loss) for the year 574 507
KEPCO Netherlands S3 B.V.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 51,045 44,042
Total liabilities 150 54
Sales 0 0
Profit (loss) for the year 3,199 2,833
PT. KOMIPO Pembangkitan Jawa Bali    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 13,499 12,946
Total liabilities 3,314 3,298
Sales 18,296 20,306
Profit (loss) for the year 885 4,775
PT. Cirebon Power Service    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 2,545 1,825
Total liabilities 631 550
Sales 8,664 8,642
Profit (loss) for the year 505 344
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 year 0 0
KOSPO Jordan LLC    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 33,782 31,620
Total liabilities 16,298 15,654
Sales 9,698 9,356
Profit (loss) for the year 816 1,570
EWP America Inc.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 46,687 [1] 37,681 [2]
Total liabilities 1,278 [1] 2,683 [2]
Sales 18,335 [1] 14,312 [2]
Profit (loss) for the year 6,807 [1] (14,327) [2]
KNF Canada Energy Limited    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 2,101 1,871
Total liabilities 17 22
Sales 0 0
Profit (loss) for the year (43) (50)
EWP Barbados 1 SRL    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 354,024 313,409
Total liabilities 1,172 1,170
Sales 2,861 2,950
Profit (loss) for the year 16,168 44,729
Gyeonggi Green Energy Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 243,977 265,768
Total liabilities 224,132 240,366
Sales 93,794 64,660
Profit (loss) for the year (5,588) (9,968)
PT. Tanggamus Electric Power    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 212,161 217,730
Total liabilities 167,409 184,057
Sales 2,903 3,491
Profit (loss) for the year 3,017 11,942
Gyeongju Wind Power Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 96,937 105,726
Total liabilities 60,702 68,629
Sales 15,289 13,939
Profit (loss) for the year 3,132 2,108
KOMIPO America Inc.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 329,986 [3] 105,926
Total liabilities 56,325 [3] 918
Sales 1,715 [3] 342
Profit (loss) for the year (1,311) [3] (1,783)
KOSEP USA, Inc.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets   1
Total liabilities   4,837
Sales   0
Profit (loss) for the year   0
PT. EWP Indonesia    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 47,031 33,900
Total liabilities 1,226 1,125
Sales 0 0
Profit (loss) for the year 4,615 7,083
KEPCO Netherlands J3 B.V.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 151,478 138,824
Total liabilities 172 84
Sales 0 0
Profit (loss) for the year 27,365 28,242
Korea Offshore Wind Power Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 359,393 354,643
Total liabilities 188,507 187,576
Sales 36,020 26,838
Profit (loss) for the year 3,820 98
Global One Pioneer B.V.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 119 177
Total liabilities 116 60
Sales 0 0
Profit (loss) for the year (132) (76)
Global Energy Pioneer B.V.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 293 338
Total liabilities 131 64
Sales 0 0
Profit (loss) for the year (147) (70)
Mira Power Limited    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 424,183 348,737
Total liabilities 311,459 266,565
Sales 70,287 31,172
Profit (loss) for the year 34,018 (2,960)
KOSEP Material Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 3,405 2,312
Total liabilities 842 429
Sales 4,518 3,457
Profit (loss) for the year 442 189
Commerce and Industry Energy Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 85,315 89,681
Total liabilities 35,543 41,384
Sales 30,531 31,603
Profit (loss) for the year 1,345 1,623
KEPCO KPS Philippines Corp.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 8,051 3,119
Total liabilities 3,652 284
Sales 9,768 5,151
Profit (loss) for the year 1,493 158
KOSPO Chile SpA    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 142,956 128,795
Total liabilities 56,688 48,813
Sales 0 0
Profit (loss) for the year (851) (542)
PT. KOWEPO Sumsel Operation and Maintenance Services    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 116 108
Total liabilities 259 241
Sales 0 0
Profit (loss) for the year 0 (15)
HeeMang Sunlight Power Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 6,242 7,261
Total liabilities 3,272 4,339
Sales 499 423
Profit (loss) for the year 47 (142)
Fujeij Wind Power Company    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 200,783 194,844
Total liabilities 169,340 174,051
Sales 0 0
Profit (loss) for the year 14,739 13,720
KOSPO Youngnam Power Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 393,745 389,071
Total liabilities 292,765 294,408
Sales 318,770 254,966
Profit (loss) for the year 6,339 3,405
VI Carbon Professional Private Special Asset Investment Trust 1    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets   3,006
Total liabilities   4
Sales   0
Profit (loss) for the year   7
Chitose Solar Power Plant LLC    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 125,578 133,643
Total liabilities 109,470 118,783
Sales 16,630 17,073
Profit (loss) for the year 1,794 1,521
KEPCO Energy Solution Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 317,676 313,754
Total liabilities 4,938 4,093
Sales 21,423 5,585
Profit (loss) for the year 3,104 3,656
KEPCO Solar Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 231,567 230,443
Total liabilities 22,229 23,098
Sales 11,305 3,933
Profit (loss) for the year 2,014 1,888
KOSPO Power Services Ltda.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 8,007 4,354
Total liabilities 5,800 1,644
Sales 21,133 10,846
Profit (loss) for the year (356) 1,011
Energy New Industry Specialized Investment Private Investment Trust    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 336,932 [4] 279,489 [5]
Total liabilities 28,536 [4] 24,173 [5]
Sales 19,405 [4] 23,682 [5]
Profit (loss) for the year 11,116 [4] 8,248 [5]
KOEN Bylong Pty., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 8 6
Total liabilities 86 75
Sales 0 0
Profit (loss) for the year 0 (11)
KOMIPO Bylong Pty., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 8 7
Total liabilities 86 76
Sales 0 0
Profit (loss) for the year (8) (11)
KOWEPO Bylong Pty., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 8 6
Total liabilities 86 64
Sales 0 0
Profit (loss) for the year (18) 0
KOSPO Bylong Pty., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 73 153
Total liabilities 168 213
Sales 0 0
Profit (loss) for the year (20) (2)
EWP Bylong Pty., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 8 6
Total liabilities 54 35
Sales 0 0
Profit (loss) for the year 0 28
KOWEPO Lao International    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 12,974 8,982
Total liabilities 70 392
Sales 8,543 8,466
Profit (loss) for the year 5,681 4,706
KEPCO US Inc.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 17,601 16,154
Total liabilities 0 0
Sales 0 0
Profit (loss) for the year 0 (21)
KEPCO Alamosa LLC    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 34,100 31,353
Total liabilities 297 270
Sales 124 127
Profit (loss) for the year (62) (237)
KEPCO Solar of Alamosa, LLC    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 57,104 68,336
Total liabilities 41,953 42,910
Sales 8,008 9,096
Profit (loss) for the year (742) (2,052)
KEPCO Mangilao Holdings LLC    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 28,504 25,785
Total liabilities 32,501 28,924
Sales 0 0
Profit (loss) for the year (556) (502)
Mangilao Investment LLC    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 43,459 38,090
Total liabilities 29 14
Sales 0 0
Profit (loss) for the year (14) (15)
KEPCO Mangilao Solar, LLC    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 206,018 69,830
Total liabilities 166,095 34,029
Sales 0 0
Profit (loss) for the year (865) (253)
Jeju Hanlim Offshore Wind Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 41,325 20,525
Total liabilities 5,139 9,805
Sales 0 0
Profit (loss) for the year (2,893) (3,049)
PT. Siborpa Eco Power    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 11,306 10,491
Total liabilities 0 14
Sales 0 0
Profit (loss) for the year (105) (361)
PT. Korea Energy Indonesia    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,917 1,746
Total liabilities 215 196
Sales 1,681 2,428
Profit (loss) for the year 37 190
KOLAT SpA    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 28,349 31,109
Total liabilities 849 425
Sales 180 243
Profit (loss) for the year (464) (216)
KEPCO California, LLC    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 43,732 41,973
Total liabilities 4,113 4,683
Sales 1,310 0
Profit (loss) for the year 160 (1,330)
KEPCO Mojave Holdings, LLC    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 95,294 95,326
Total liabilities 71,358 67,138
Sales 0 0
Profit (loss) for the year (4,254) (4,358)
Incheon Fuel Cell Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 259,111 192,184
Total liabilities 236,901 170,976
Sales 46,034 0
Profit (loss) for the year 962 (979)
KOEN Service Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 8,963 6,239
Total liabilities 6,557 5,598
Sales 35,190 32,150
Profit (loss) for the year 2,326 129
KOMIPO Service Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 4,384 3,381
Total liabilities 4,475 3,649
Sales 32,323 28,596
Profit (loss) for the year (96) (479)
KOWEPO Service Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 7,289 6,045
Total liabilities 5,869 4,849
Sales 31,700 29,559
Profit (loss) for the year 303 726
KOSPO Service Co., Ltd    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 5,762 5,617
Total liabilities 4,990 4,708
Sales 26,257 25,103
Profit (loss) for the year 31 832
EWP Service Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 5,483 4,568
Total liabilities 5,455 4,074
Sales 24,957 23,223
Profit (loss) for the year 14 (15)
PT. KOMIPO Energy Indonesia    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 2,996 2,473
Total liabilities 395 154
Sales 2,077 2,391
Profit (loss) for the year 106 52
KNF Partners Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,800 1,470
Total liabilities 969 743
Sales 5,664 5,487
Profit (loss) for the year 152 256
KOSPO USA Inc.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 286,081 120,380
Total liabilities 293 266
Sales 0 0
Profit (loss) for the year 968 (1,611)
Nambu USA LLC    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 277,698 42,739
Total liabilities 0 0
Sales 0 0
Profit (loss) for the year 568 544
Tamra Offshore Wind Power Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 146,736 150,957
Total liabilities 106,961 112,184
Sales 21,731 22,200
Profit (loss) for the year 5,168 4,575
KEPCO MCS Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 80,277 59,227
Total liabilities 39,139 36,786
Sales 349,116 342,053
Profit (loss) for the year 19,043 19,190
KEPCO FMS Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 17,188 14,390
Total liabilities 15,577 12,585
Sales 94,210 89,228
Profit (loss) for the year 214 837
Firstkeepers Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 17,152 13,981
Total liabilities 16,041 12,234
Sales 77,189 68,538
Profit (loss) for the year 19 2,994
Secutec Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 13,176 11,473
Total liabilities 10,662 9,771
Sales 65,963 62,256
Profit (loss) for the year 1,774 1,609
SE Green Energy Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 153,105 152,205
Total liabilities 119,461 122,606
Sales 38,867 19,731
Profit (loss) for the year 4,025 2,463
KEPCO Mangilao America LLC    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 2,173 1,793
Total liabilities 1 0
Sales 0 0
Profit (loss) for the year 0 0
Mangilao Intermediate Holdings LLC    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 220,690 100,609
Total liabilities 205,421 80,210
Sales 0 0
Profit (loss) for the year (6,975) (3,708)
KEPCO CSC Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 8,093 8,817
Total liabilities 6,799 5,551
Sales 41,854 38,465
Profit (loss) for the year (2,101) 2,479
KOAK Power Limited    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 14,363 15,864
Total liabilities 393 1,118
Sales 0 0
Profit (loss) for the year (551) 607
KOMIPO Europe B.V.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 70,431 43,198
Total liabilities 97 46
Sales 402 333
Profit (loss) for the year (503) (386)
Haenanum Energy Fund    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 7,463 28,219
Total liabilities 3 132
Sales 40 128
Profit (loss) for the year (74) (13)
Paju Ecoenergy Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 57,795 57,320
Total liabilities 2,118 3,506
Sales 15,425 3,069
Profit (loss) for the year 2,234 247
Guam Ukudu Power LLC    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 30,133 3,165
Total liabilities 30,438 3,589
Sales 0 0
Profit (loss) for the year (2,030) (1,577)
TS Energy No. 25 Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 353,324 184,667
Total liabilities 318,977 142,709
Sales 421 0
Profit (loss) for the year (7,525) (3,779)
KPS Partners Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 2,809 2,139
Total liabilities 1,529 1,127
Sales 9,520 3,562
Profit (loss) for the year 323 313
KEPCO E&C Service Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 4,054 2,514
Total liabilities 1,889 1,549
Sales 15,985 4,989
Profit (loss) for the year 1,242 464
Moha Solar Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 32,808 7,390
Total liabilities 33,933 7,809
Sales 48 0
Profit (loss) for the year (706) (364)
Ogiri Solar Power Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,041 1,032
Total liabilities 1 0
Sales 0 0
Profit (loss) for the year 9 0
KHNP USA LLC    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 766 464
Total liabilities 10 23
Sales 1,001 229
Profit (loss) for the year 267 119
KOMIPO Vanphong Power Service LLC    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 3,758 1,727
Total liabilities 860 12
Sales 3,853 0
Profit (loss) for the year 958 (34)
Energy Innovation Fund I    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 22,616 8,412
Total liabilities 3,202 1
Sales 0 25
Profit (loss) for the year (888) ₩ (201)
KHNP Chile SpA    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 5,294  
Total liabilities 3,879  
Sales 0  
Profit (loss) for the year 17  
Yeong Yang Apollon Photovoltaic Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,775  
Total liabilities 1,632  
Sales 5  
Profit (loss) for the year (30)  
Yeong Yang Corporation Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,776  
Total liabilities 1,623  
Sales 9  
Profit (loss) for the year (19)  
SolarVader Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,772  
Total liabilities 1,627  
Sales 0  
Profit (loss) for the year (26)  
Yeong Yang Innovation Co., Ltd. [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,773  
Total liabilities 1,622  
Sales 5  
Profit (loss) for the year (21)  
Yeong Yang Horus Photovoltaic Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,771  
Total liabilities 1,624  
Sales 9  
Profit (loss) for the year (24)  
Yeong Yang Solar Management Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,774  
Total liabilities 1,625  
Sales 0  
Profit (loss) for the year (23)  
LSG Hydro Power Limited    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1  
Total liabilities 0  
Sales 0  
Profit (loss) for the year 0  
KOEN Bio Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 394  
Total liabilities 199  
Sales 51  
Profit (loss) for the year (305)  
KOMIPO Iberian Solar Group, S.L.U.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 70,993  
Total liabilities 56,707  
Sales 0  
Profit (loss) for the year 1,354  
Jeongam Wind Power Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 86,853  
Total liabilities 74,267  
Sales 10,476  
Profit (loss) for the year 1,027  
KOWEPO Europe B.V.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 39,973  
Total liabilities 1,449  
Sales 0  
Profit (loss) for the year (744)  
Yeongdeok Sunrise Wind Power Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 21,252  
Total liabilities 768  
Sales 0  
Profit (loss) for the year (116)  
KHNP Spain, S.L.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 5  
Total liabilities 0  
Sales 0  
Profit (loss) for the year ₩ 0  
[1] Financial information of EWP America Inc. includes that of three other subsidiaries, EWP Renewable Corporation, California Power Holdings, LLC and EWPRC Biomass Holdings, LLC.
[2] Financial information of EWP America Inc. includes that of four other subsidiaries, EWP Renewable Corporation, DG Fairhaven Power, LLC, California Power Holdings, LLC and EWPRC Biomass Holdings, LLC.
[3] Financial information of KOMIPO America Inc. includes that of 17 other subsidiaries including Elara Equity Holdings, LLC and CVS Equity Holdings, LLC.
[4] Financial information of Energy New Industry Specialized Investment Private Investment Trust includes that of four other subsidiaries, BSK E-New Industry Fund VII, e-New Industry LB Fund 1, Songhyun e-New Industry Fund and BSK E-New Industry Fund X.
[5] Financial information of Energy New Industry Specialized Investment Private Investment Trust includes that of four other subsidiaries, BSK E-New Industry Fund VII, e-New Industry LB Fund 1, Songhyun e-New Industry Fund and BSK E-New Industry Fund X.