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Summary of financial information of consolidated subsidiaries (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Korea Hydro & Nuclear Power    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets ₩ 59,570,219 ₩ 55,792,704
Total liabilities 33,917,275 30,484,104
Sales 8,969,072 8,858,717
Profit (loss) for the period 306,007 (137,613)
Korea South-East Power    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 10,938,358 9,997,758
Total liabilities 5,866,642 4,948,553
Sales 5,385,387 5,521,038
Profit (loss) for the period 41,006 25,736
Korea Midland Power    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 12,684,828 10,839,218
Total liabilities 8,977,766 7,088,013
Sales 4,479,707 4,368,467
Profit (loss) for the period (28,449) (38,142)
Korea Western Power    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 10,514,438 9,902,752
Total liabilities 6,637,451 5,965,410
Sales 4,448,992 4,841,261
Profit (loss) for the period (46,061) (28,157)
Korea Southern Power    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 10,884,799 9,810,985
Total liabilities 6,608,301 5,463,721
Sales 5,084,907 5,539,793
Profit (loss) for the period (41,342) 55,439
Korea East-West Power    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 9,724,311 8,744,380
Total liabilities 5,022,921 4,092,460
Sales 4,855,964 4,933,525
Profit (loss) for the period 56,698 3,345
KEPCO Engineering & Construction Company    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 735,207 771,480
Total liabilities 242,994 310,100
Sales 448,635 433,701
Profit (loss) for the period 26,398 12,937
KEPCO Plant Service & Engineering    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,356,983 1,275,365
Total liabilities 294,757 296,428
Sales 1,244,613 1,239,604
Profit (loss) for the period 157,737 160,791
KEPCO Nuclear Fuel    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 831,604 817,416
Total liabilities 429,799 434,439
Sales 309,055 230,667
Profit (loss) for the period 24,618 15,835
KEPCO KDN    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 604,458 566,807
Total liabilities 159,807 159,423
Sales 625,567 622,154
Profit (loss) for the period 42,205 60,016
Garolim Tidal Power Plant    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets   608
Total liabilities   345
Sales   0
Profit (loss) for the period   (11)
KEPCO International HongKong    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 138,942 140,101
Total liabilities 633 1
Sales 0 0
Profit (loss) for the period 3,330 3,307
KEPCO International Philippines    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 107,224 107,948
Total liabilities 371 1,475
Sales 0 0
Profit (loss) for the period 67,991 52,539
KEPCO Gansu International    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 10,448 12,047
Total liabilities 545 515
Sales 0 0
Profit (loss) for the period (20) (24)
KEPCO Philippines Holdings    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 200,503 188,551
Total liabilities 6,656 9,775
Sales 0 0
Profit (loss) for the period 66,200 53,219
KEPCO Philippines Corporation    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 6,706 6,394
Total liabilities 332 213
Sales 0 0
Profit (loss) for the period (52) 54
KEPCO Ilijan Corporation    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 371,377 431,444
Total liabilities 56,156 53,413
Sales 95,072 99,844
Profit (loss) for the period 40,818 49,631
KEPCO Lebanon SARL    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,835 1,509
Total liabilities 9,786 9,686
Sales 0 0
Profit (loss) for the period 255 413
KEPCO Neimenggu International    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 200,858 194,336
Total liabilities 0 0
Sales 0 0
Profit (loss) for the period (354) 20,829
KEPCO Shanxi International    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 538,604 519,991
Total liabilities 208,895 201,732
Sales 0 0
Profit (loss) for the period 151 290
KOMIPO Global Pte    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 269,302 250,456
Total liabilities 463 961
Sales 0 0
Profit (loss) for the period 10,400 11,478
KEPCO Netherlands B.V.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 122,577 130,460
Total liabilities 101 77
Sales 0 0
Profit (loss) for the period 948 26,550
KOREA Imouraren Uranium Investment Corp.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 14,173 63,517
Total liabilities 111 171
Sales 0 0
Profit (loss) for the period (49,716) (89,852)
KEPCO Australia    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 364 439,719
Total liabilities 14 14
Sales 0 0
Profit (loss) for the period (395,914) 49
KOSEP Australia    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 32,782 37,057
Total liabilities 2,911 2,832
Sales 15,514 20,294
Profit (loss) for the period 3,935 7,315
KOMIPO Australia    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 40,898 39,066
Total liabilities 2,909 4,659
Sales 15,514 20,294
Profit (loss) for the period 3,766 7,193
KOWEPO Australia    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 44,182 39,341
Total liabilities 5,772 4,702
Sales 15,514 20,294
Profit (loss) for the period 2,761 7,316
KOSPO Australia    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 37,254 36,525
Total liabilities 5,012 3,585
Sales 15,514 20,294
Profit (loss) for the period 2,638 9,520
KEPCO Middle East Holding Company    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 102,164 101,201
Total liabilities 87,834 92,862
Sales 0 0
Profit (loss) for the period 5,934 3,043
Qatrana Electric Power Company    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 490,723 484,383
Total liabilities 322,857 326,486
Sales 20,773 18,766
Profit (loss) for the period 21,807 21,170
KHNP Canada Energy    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 44,639 49,776
Total liabilities 43 35
Sales 0 0
Profit (loss) for the period (10) (26)
KEPCO Bylong Australia    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 45,207 254,398
Total liabilities 355,163 315,921
Sales 0 0
Profit (loss) for the period (220,909) (29,573)
Korea Waterbury Uranium Limited Partnership    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 20,717 20,890
Total liabilities 167 142
Sales 0 0
Profit (loss) for the period (77) (74)
Korea Electric Power Nigeria    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets   112
Total liabilities   39
Sales   727
Profit (loss) for the period   (93)
KEPCO Holdings de Mexico    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 187 248
Total liabilities 25 57
Sales 0 0
Profit (loss) for the period (14) (11)
KST Electric Power Company    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 539,952 535,807
Total liabilities 449,459 457,867
Sales 55,783 109,735
Profit (loss) for the period (20,797) 10,274
KEPCO Energy Service Company    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 2,262 1,940
Total liabilities 1,995 1,454
Sales 5,984 5,117
Profit (loss) for the period (481) (232)
KEPCO Netherlands S3 B.V.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 50,352 46,642
Total liabilities 49 53
Sales 0 0
Profit (loss) for the period 2,637 2,382
PT. KOMIPO Pembangkitan Jawa Bali    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 12,391 11,405
Total liabilities 5,719 5,472
Sales 18,722 20,320
Profit (loss) for the period 4,312 3,925
PT. Cirebon Power Service    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 2,089 1,588
Total liabilities 313 273
Sales 8,049 7,228
Profit (loss) for the period 406 177
KOWEPO International Corporation    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 0 0
Total liabilities 10 8
Sales 0 0
Profit (loss) for the period (2) 0
KOSPO Jordan    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 17,489 16,315
Total liabilities 1,521 3,432
Sales 10,878 34,371
Profit (loss) for the period 2,634 1,907
EWP Philippines Corporation    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,691 1,684
Total liabilities 888 829
Sales 0 0
Profit (loss) for the period (111) (11)
EWP America    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets [1] 66,622 72,525
Total liabilities [1] 2,619 4,903
Sales [1] 21,719 29,557
Profit (loss) for the period [1] (6,497) (4,483)
KNF Canada Energy Limited    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,933 1,801
Total liabilities 24 20
Sales 0 0
Profit (loss) for the period (48) (45)
EWP Barbados 1 SRL    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 279,295 268,033
Total liabilities 1,031 1,581
Sales 2,914 688
Profit (loss) for the period 2,368 11,221
Gyeonggi Green Energy    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 194,425 293,812
Total liabilities 159,078 185,043
Sales 13,717 96,442
Profit (loss) for the period (73,394) 25,121
PT. Tanggamus Electric Power    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 228,601 216,321
Total liabilities 195,826 187,502
Sales 2,256 26,832
Profit (loss) for the period (4,529) 9,338
Gyeongju Wind Power    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 113,745 122,303
Total liabilities 75,427 83,348
Sales 15,548 21,906
Profit (loss) for the period 3,384 8,803
KOMIPO America    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 9,424 10,092
Total liabilities 593 572
Sales 118 0
Profit (loss) for the period (1,033) (885)
KOSEP USA INC.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1 1
Total liabilities 5,147 4,857
Sales 0 0
Profit (loss) for the period (119) 4,341
PT. EWP Indonesia    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 34,455 7,444
Total liabilities 5 14
Sales 0 0
Profit (loss) for the period 5,124 3,138
KEPCO Netherlands J3 B.V.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 120,006 115,978
Total liabilities 74 77
Sales 0 0
Profit (loss) for the period (79) (104)
Korea Offshore Wind Power B.V.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 284,495 216,114
Total liabilities 117,527 36,377
Sales 0 0
Profit (loss) for the period (12,768) (8,473)
Global One Pioneer B.V.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 180 162
Total liabilities 73 87
Sales 0 0
Profit (loss) for the period (86) (113)
Global Energy Pioneer B.V.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 348 325
Total liabilities 80 74
Sales 0 0
Profit (loss) for the period (90) (102)
Mira Power Limited    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 356,111 277,525
Total liabilities 285,577 213,104
Sales 0 0
Profit (loss) for the period (971) (980)
KOSEP Material    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 2,788 2,862
Total liabilities 1,186 1,249
Sales 3,357 3,240
Profit (loss) for the period 22 377
Commerce and Industry Energy    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 90,637 92,872
Total liabilities 43,985 88,009
Sales 32,728 27,937
Profit (loss) for the period (7,532) (6,091)
KEPCO Singapore Holdings Pte.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets   582
Total liabilities   9
Sales   0
Profit (loss) for the period   (31)
KEPCO KPS Philippines Corp.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 5,198 7,501
Total liabilities 1,341 358
Sales 6,246 4,815
Profit (loss) for the period 2 766
KOSPO Chile SpA    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 134,827 139,814
Total liabilities 49,183 57,502
Sales 0 0
Profit (loss) for the period (456) 1,016
PT. KOWEPO Sumsel Operation and Maintenance Services    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 135 1,313
Total liabilities 262 394
Sales 0 4,343
Profit (loss) for the period (1,104) (654)
HeeMang Sunlight Power    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 12,185 10,915
Total liabilities 8,545 7,626
Sales 643 146
Profit (loss) for the period 75 (192)
Fujeij Wind Power Company    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 218,333 217,796
Total liabilities 196,964 212,435
Sales 0 0
Profit (loss) for the period 5,515 (1,033)
KOSPO Youngnam Power    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 398,495 413,472
Total liabilities 307,226 325,589
Sales 318,338 369,669
Profit (loss) for the period 3,514 8,155
VI Carbon Professional Private Special Asset Investment Trust 1 (formally, HI Carbon Professional Private Special Asset)    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 3,002 3,002
Total liabilities 0 0
Sales 0 0
Profit (loss) for the period 12 12
Chitose Solar Power Plant LLC    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 121,457 115,505
Total liabilities 106,254 105,079
Sales 17,103 15,022
Profit (loss) for the period 5,480 872
KEPCO Energy Solution    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 308,188 304,103
Total liabilities 2,142 849
Sales 2,843 5,584
Profit (loss) for the period 2,805 2,532
Solar School Plant    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 208,730 204,282
Total liabilities 3,269 1,366
Sales 1,962 1,149
Profit (loss) for the period 2,553 2,033
KOSPO Power Services Limitada    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 3,244 3,045
Total liabilities 1,564 596
Sales 10,013 9,610
Profit (loss) for the period 452 1,132
Energy New Industry Specialized Investment Private Investment Trust    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets [2] 100,116 66,498
Total liabilities [2] 17,359 1,014
Sales [2] 2,418 0
Profit (loss) for the period [2] (7,735) (1,140)
KOEN Bylong    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 0 5,544
Total liabilities 39 26
Sales 0 0
Profit (loss) for the period (14) (10)
KOMIPO Bylong    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 4 5,544
Total liabilities 43 26
Sales 0 0
Profit (loss) for the period (14) (25)
KOWEPO Bylong    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 4 5,544
Total liabilities 40 26
Sales 0 0
Profit (loss) for the period (12) 0
KOSPO Bylong    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 4 5,544
Total liabilities 40 26
Sales 0 0
Profit (loss) for the period (12) (25)
EWP Bylong    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 4 5,544
Total liabilities 40 26
Sales 0 0
Profit (loss) for the period (12) (15)
KOWEPO Lao International    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 5,430 3,800
Total liabilities 575 1,015
Sales 4,308 2,899
Profit (loss) for the period 1,584 895
KEPCO US    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 17,231 16,640
Total liabilities 0 0
Sales 0 0
Profit (loss) for the period 0 6
KEPCO Alamosa    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 33,515 32,346
Total liabilities 183 79
Sales 145 750
Profit (loss) for the period (311) (688)
KEPCO Solar of Alamosa, LLC (formerly, Cogentrix of Alamosa, LLC)    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 65,468 64,223
Total liabilities 50,348 48,819
Sales 8,739 9,015
Profit (loss) for the period (1,902) 200
KEPCO-LG CNS Mangilao Holdings    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 27,439 25,642
Total liabilities 30,287 27,197
Sales 0 0
Profit (loss) for the period (1,240) (1,144)
Mangilao Investment    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 39,972 25,641
Total liabilities 0 0
Sales 0 0
Profit (loss) for the period 0 0
KEPCO-LG CNS Mangilao Solar    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 39,373 25,406
Total liabilities 11 146
Sales 0 0
Profit (loss) for the period (524) (104)
Jeju Hanlim Offshore Wind Co    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 14,328 16,557
Total liabilities 558 328
Sales 0 0
Profit (loss) for the period (2,459) (925)
PT. Siborpa Eco Power    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 11,574 12,363
Total liabilities 71 141
Sales 0 0
Profit (loss) for the period (1,165) (1,771)
PT. Korea Energy Indonesia    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,592 1,183
Total liabilities 121 60
Sales 2,462 1,459
Profit (loss) for the period 323 223
KOLAT SpA    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 31,178 38,362
Total liabilities 167 474
Sales 656 585
Profit (loss) for the period (296) (186)
KEPCO California, LLC    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 44,074 42,171
Total liabilities 936 21
Sales 358 0
Profit (loss) for the period (513) (332)
KEPCO Mojave Holdings, LLC    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 103,815 103,189
Total liabilities 69,544 65,730
Sales 0 0
Profit (loss) for the period (4,215) (3,959)
Incheon Fuel Cell Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 22,669 23,626
Total liabilities 475 415
Sales 0 0
Profit (loss) for the period (1,010) (201)
KOEN Service Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 5,347 583
Total liabilities 4,252 31
Sales 25,890 0
Profit (loss) for the period 543 (48)
KOMIPO Service Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 3,327 576
Total liabilities 2,622 17
Sales 24,556 0
Profit (loss) for the period 146 (41)
KOWEPO Service Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 4,228 750
Total liabilities 3,302 227
Sales 23,982 0
Profit (loss) for the period 389 (77)
KOSPO Service Co., Ltd    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 3,493 576
Total liabilities 2,788 6
Sales 18,741 0
Profit (loss) for the period 135 (30)
EWP Service Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 4,786 667
Total liabilities 4,064 97
Sales 20,837 0
Profit (loss) for the period 162 (30)
PT. KOMIPO Energy Indonesia    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 2,647 2,236
Total liabilities 196 0
Sales 1,392 0
Profit (loss) for the period 79 ₩ 0
KNF Partners Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,378  
Total liabilities 890  
Sales 3,383  
Profit (loss) for the period 187  
KOSPO USA Inc.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 5,896  
Total liabilities 127  
Sales 0  
Profit (loss) for the period (1,408)  
Nambu USA LLC    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 245  
Total liabilities 1  
Sales 0  
Profit (loss) for the period 245  
Tamra Offshore Wind Power Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 156,708  
Total liabilities 121,724  
Sales 19,670  
Profit (loss) for the period 1,154  
KEPCO MCS Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 26,510  
Total liabilities 22,151  
Sales 129,393  
Profit (loss) for the period 3,408  
KEPCO FMS Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 11,336  
Total liabilities 10,638  
Sales 37,627  
Profit (loss) for the period 198  
Firstkeepers Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,552  
Total liabilities 2,800  
Sales 121  
Profit (loss) for the period (2,239)  
Secutec Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 322  
Total liabilities 229  
Sales 0  
Profit (loss) for the period (597)  
SE Green Energy Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 132,727  
Total liabilities 105,619  
Sales 0  
Profit (loss) for the period 816  
KEPCO Mangilao America LLC    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 0  
Total liabilities 0  
Sales 0  
Profit (loss) for the period 0  
Mangilao Intermediate Holdings LLC    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 13,220  
Total liabilities 12,774  
Sales 0  
Profit (loss) for the period (66)  
KEPCO CSC Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 837  
Total liabilities 51  
Sales 0  
Profit (loss) for the period (14)  
KOAK Power Limited    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 15,930  
Total liabilities 0  
Sales 0  
Profit (loss) for the period 0  
KOMIPO Europe B.V.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 7,362  
Total liabilities 0  
Sales 0  
Profit (loss) for the period (286)  
Haenanum Energy Fund    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 28,101  
Total liabilities 1  
Sales 0  
Profit (loss) for the period 1  
Paju Ecoenergy Co., Ltd.    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 53,839  
Total liabilities 0  
Sales 0  
Profit (loss) for the period ₩ 0  
[1] Financial information of EWP America Inc. includes that of six other subsidiaries, EWP Renewable Corporation, DG Fairhaven Power, LLC, DG Whitefield, LLC, Springfield Power, LLC, California Power Holdings, LLC, and EWPRC Biomass Holdings, LLC.
[2] Financial information of Energy New Industry Specialized Investment Private Investment Trust includes that of three other subsidiaries, BSK E-New Industry Fund VII, e-New Industry LB Fund 1 and Songhyun e-New Industry Fund.