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Investments in Joint Ventures 2 (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Book value [Abstract]    
Beginning balance ₩ 1,919,746 ₩ 1,663,029
Acquisition 134,959 289,068
Disposal (11,710) 0
Dividends received (139,847) (139,519)
Share of income (loss) 139,933 220,032
Other comprehensive income (loss) 190,305 (113,377)
Others (book value) 5,625 513
Ending balance 2,239,011 1,919,746
Beginning balance 6,170,533 5,914,831
Acquisition 703,612 385,323
Disposal (15,194) (207)
Dividends received (288,242) (237,694)
Share of income (loss) 557,056 279,124
Other comprehensive income (loss) 352,056 (162,288)
Others (book value) (8,437) (8,556)
Ending balance 7,471,384 6,170,533
KEPCO-Uhde Inc.    
Book value [Abstract]    
Beginning balance 100  
Acquisition 0  
Disposal 0  
Dividends received 0  
Share of income (loss) (42)  
Other comprehensive income (loss) 0  
Others (book value) 0  
Ending balance 58 [1] 100
KEPCO-Uhde Inc.    
Book value [Abstract]    
Beginning balance 100 134
Acquisition   0
Disposal   0
Dividends received   0
Share of income (loss)   (34)
Other comprehensive income (loss)   0
Others (book value)   0
Ending balance 58 100
Shuweihat Asia Power Investment B.V.    
Book value [Abstract]    
Beginning balance 13,264 18,318
Acquisition 0 0
Disposal 0 0
Dividends received (2,467) (4,337)
Share of income (loss) 4,564 5,919
Other comprehensive income (loss) 21,708 (6,636)
Others (book value) 0 0
Ending balance 37,069 13,264
Shuweihat Asia Operation & Maintenance Company    
Book value [Abstract]    
Beginning balance 1,057 1,408
Acquisition 0 0
Disposal 0 0
Dividends received (881) (922)
Share of income (loss) 1,101 1,074
Other comprehensive income (loss) 103 (503)
Others (book value) 0 0
Ending balance 1,380 [1] 1,057
Waterbury Lake Uranium L.P.    
Book value [Abstract]    
Beginning balance 19,797 20,562
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 0 4
Other comprehensive income (loss) 1,793 (769)
Others (book value) 0 0
Ending balance 21,590 19,797
ASM-BG Investicii AD    
Book value [Abstract]    
Beginning balance 18,200 19,376
Acquisition 0 0
Disposal 0 0
Dividends received (2,703) (4,206)
Share of income (loss) 2,700 2,575
Other comprehensive income (loss) 495 455
Others (book value) 0 0
Ending balance 18,692 18,200
RES Technology AD    
Book value [Abstract]    
Beginning balance 15,930 16,248
Acquisition 0 0
Disposal 0 0
Dividends received (676) (1,981)
Share of income (loss) 1,116 1,051
Other comprehensive income (loss) 333 612
Others (book value) 0 0
Ending balance 16,703 15,930
KV Holdings, Inc.    
Book value [Abstract]    
Beginning balance 2,405 2,441
Acquisition 0 0
Disposal 0 0
Dividends received (901) (617)
Share of income (loss) 962 580
Other comprehensive income (loss) 61 1
Others (book value) 0 0
Ending balance 2,527 2,405
KEPCO SPC Power Corporation    
Book value [Abstract]    
Beginning balance 201,663 214,794
Acquisition 0 0
Disposal 0 0
Dividends received (35,763) (48,486)
Share of income (loss) 37,073 48,479
Other comprehensive income (loss) (3,994) (12,995)
Others (book value) 0 (129)
Ending balance 198,979 [1] 201,663
Gansu Datang Yumen Wind Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 6,530 8,149
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) (619) (1,718)
Other comprehensive income (loss) 724 99
Others (book value) 0 0
Ending balance 6,635 6,530
Datang Chifeng Renewable Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 188,478 185,307
Acquisition 0 0
Disposal 0 0
Dividends received (14,191) (13,453)
Share of income (loss) 9,342 15,317
Other comprehensive income (loss) 20,958 1,307
Others (book value) 0 0
Ending balance 204,587 188,478
Datang KEPCO Chaoyang Renewable Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 42,530 41,024
Acquisition 0 0
Disposal 0 0
Dividends received (2,884) 0
Share of income (loss) 1,562 1,231
Other comprehensive income (loss) 3,009 275
Others (book value) 0 0
Ending balance 44,217 42,530
Rabigh Electricity Company    
Book value [Abstract]    
Beginning balance 97,157 109,096
Acquisition 0 0
Disposal 0 0
Dividends received (7,221) (14,956)
Share of income (loss) 17,896 25,474
Other comprehensive income (loss) 35,846 (22,458)
Others (book value) 0 1
Ending balance 143,678 97,157
Rabigh Operation & Maintenance Company Limited    
Book value [Abstract]    
Beginning balance 3,813 6,879
Acquisition 0 0
Disposal 0 0
Dividends received (4,085) (5,340)
Share of income (loss) 3,489 2,788
Other comprehensive income (loss) 854 (514)
Others (book value) 0 0
Ending balance 4,071 3,813
Jamaica Public Service Company Limited    
Book value [Abstract]    
Beginning balance 266,221 253,607
Acquisition 0 0
Disposal 0 0
Dividends received (4,578) (4,352)
Share of income (loss) 12,963 24,669
Other comprehensive income (loss) 23,820 (10,891)
Others (book value) (3,777) 3,188
Ending balance 294,649 266,221
KW Nuclear Components Co., Ltd.    
Book value [Abstract]    
Beginning balance 11,171 9,052
Acquisition 0 0
Disposal 0 0
Dividends received (833) (833)
Share of income (loss) 5,396 2,952
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 15,734 11,171
Busan Shinho Solar Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 5,378 5,045
Acquisition 0 0
Disposal 0 0
Dividends received (352) (330)
Share of income (loss) 815 663
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 5,841 5,378
Global Trade Of Power System Co., Ltd.    
Book value [Abstract]    
Beginning balance 546 571
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 51 (25)
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 597 546
Expressway Solar-light Power Generation Co., Ltd.    
Book value [Abstract]    
Beginning balance 2,896 2,883
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 188 13
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 3,084 2,896
Amman Asia Electric Power Company    
Book value [Abstract]    
Beginning balance 161,253 192,164
Acquisition 0 0
Disposal 0 0
Dividends received (27,428) (28,281)
Share of income (loss) 18,487 20,165
Other comprehensive income (loss) 26,367 (22,795)
Others (book value) 0 0
Ending balance 178,679 161,253
KAPES, Inc.    
Book value [Abstract]    
Beginning balance 0 10,832
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 0 (10,806)
Other comprehensive income (loss) 0 0
Others (book value) 0 (26)
Ending balance 0 0
Honam Wind Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 3,887 4,375
Acquisition 0 0
Disposal 0 0
Dividends received 0 (435)
Share of income (loss) 154 (53)
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 4,041 3,887
Jeongam Wind Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 4,620 4,437
Acquisition 5,808 0
Disposal (10,741) 0
Dividends received 0 0
Share of income (loss) 313 183
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 0 4,620
Korea Power Engineering Service Co., Ltd.    
Book value [Abstract]    
Beginning balance 5,362 4,902
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 206 446
Other comprehensive income (loss) 0 0
Others (book value) (153) 14
Ending balance 5,415 5,362
Chun-cheon Energy Co., Ltd.    
Book value [Abstract]    
Beginning balance 27,518 34,872
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) (1,622) (7,354)
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 25,896 27,518
Yeonggwangbaeksu Wind Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 3,124 3,040
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) (396) 84
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 2,728 3,124
Nghi Son 2 Power LLC    
Book value [Abstract]    
Beginning balance 0 0
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 0 0
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 0 0
Kelar S.A    
Book value [Abstract]    
Beginning balance 71,449 70,462
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 2,121 14,864
Other comprehensive income (loss) 6,416 (9,186)
Others (book value) 6,709 (4,691)
Ending balance 86,695 71,449
PT. Tanjung Power Indonesia    
Book value [Abstract]    
Beginning balance 33,063 34,327
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 5,027 7,522
Other comprehensive income (loss) 9,029 (9,220)
Others (book value) (573) 434
Ending balance 46,546 33,063
Incheon New Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 0 0
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 0 0
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 0 0
Seokmun Energy Co., Ltd.    
Book value [Abstract]    
Beginning balance 14,814 17,342
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) (972) (2,528)
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 13,842 14,814
Daehan Wind Power PSC    
Book value [Abstract]    
Beginning balance 0 1,757
Acquisition 0 4,302
Disposal 0 0
Dividends received 0 0
Share of income (loss) 3,791 (626)
Other comprehensive income (loss) 1,363 (5,433)
Others (book value) 0 0
Ending balance 5,154 0
Barakah One Company    
Book value [Abstract]    
Beginning balance 0 0
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 0 0
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 0 0
Nawah Energy Company    
Book value [Abstract]    
Beginning balance 270 285
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 0 2
Other comprehensive income (loss) 24 (17)
Others (book value) 0 0
Ending balance 294 270
Momentum    
Book value [Abstract]    
Beginning balance 565 553
Acquisition 0 0
Disposal 0 0
Dividends received (569) (404)
Share of income (loss) 368 399
Other comprehensive income (loss) 4 17
Others (book value) 0 0
Ending balance 368 565
Daegu Green Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 23,045 22,824
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 982 128
Other comprehensive income (loss) 0 0
Others (book value) 27 93
Ending balance 24,054 23,045
Yeonggwang Wind Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 17,256 17,627
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 390 (371)
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 17,646 17,256
Chester Solar IV SpA    
Book value [Abstract]    
Beginning balance 1,064 672
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) (1,083) 389
Other comprehensive income (loss) (36) 80
Others (book value) 55 (77)
Ending balance 0 1,064
Chester Solar V SpA    
Book value [Abstract]    
Beginning balance 277 146
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) (269) 135
Other comprehensive income (loss) 2 17
Others (book value) 15 (21)
Ending balance 25 277
Diego de Almagro Solar SpA    
Book value [Abstract]    
Beginning balance 1,490 1,035
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) (1,095) 455
Other comprehensive income (loss) (123) 107
Others (book value) 90 (107)
Ending balance 362 1,490
South Jamaica Power Company Limited    
Book value [Abstract]    
Beginning balance 31,897 13,863
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 2,515 20,468
Other comprehensive income (loss) 2,949 (2,432)
Others (book value) (1) (2)
Ending balance 37,360 31,897
Daesan Green Energy Co., Ltd.    
Book value [Abstract]    
Beginning balance 22,552 17,182
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) (1,308) 5,371
Other comprehensive income (loss) 0 0
Others (book value) 0 (1)
Ending balance 21,244 22,552
RE Holiday Holdings LLC    
Book value [Abstract]    
Beginning balance 68,809 42,070
Acquisition 0 0
Disposal 0 0
Dividends received (9,577) 0
Share of income (loss) 6,299 33,072
Other comprehensive income (loss) 7,636 (6,333)
Others (book value) 0 0
Ending balance 73,167 68,809
RE Pioneer Holdings LLC    
Book value [Abstract]    
Beginning balance 49,639 31,156
Acquisition 0 0
Disposal 0 0
Dividends received (14,199) (1,246)
Share of income (loss) 5,556 24,466
Other comprehensive income (loss) 6,019 (4,737)
Others (book value) 0 0
Ending balance 47,015 49,639
RE Barren Ridge 1 Holdings LLC    
Book value [Abstract]    
Beginning balance 4,466 42,916
Acquisition 0 0
Disposal 0 0
Dividends received (1,365) (872)
Share of income (loss) (3,162) (35,735)
Other comprehensive income (loss) 1,944 (1,843)
Others (book value) 0 0
Ending balance 1,883 4,466
RE Astoria 2 LandCo LLC    
Book value [Abstract]    
Beginning balance 5,230 5,602
Acquisition 0 0
Disposal 0 0
Dividends received (337) (249)
Share of income (loss) 619 210
Other comprehensive income (loss) 486 (333)
Others (book value) 0 0
Ending balance 5,998 5,230
RE Barren Ridge LandCo LLC    
Book value [Abstract]    
Beginning balance 1,847 1,966
Acquisition 0 0
Disposal 0 0
Dividends received (140) (95)
Share of income (loss) 240 95
Other comprehensive income (loss) 173 (119)
Others (book value) 0 0
Ending balance 2,120 1,847
Laurel SpA    
Book value [Abstract]    
Beginning balance 1,092 595
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) (798) 498
Other comprehensive income (loss) (71) 80
Others (book value) 67 (81)
Ending balance 290 1,092
KIAMCO KOWEPO Bannerton Hold Co Pty Ltd    
Book value [Abstract]    
Beginning balance 4,129 4,024
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) (111) (24)
Other comprehensive income (loss) (393) 129
Others (book value) 0 0
Ending balance 3,625 4,129
Chile Solar JV SpA    
Book value [Abstract]    
Beginning balance 34,883 34,859
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 831 187
Other comprehensive income (loss) (3,257) (163)
Others (book value) 0 0
Ending balance 32,457 34,883
Taebaek Gadeoksan Wind Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 13,362 7,846
Acquisition 0 4,070
Disposal 0 0
Dividends received 0 0
Share of income (loss) 762 1,468
Other comprehensive income (loss) 0 (22)
Others (book value) (14,124) 0
Ending balance 0 13,362
Cheong-Song Noraesan Wind Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 3,453 3,043
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 653 409
Other comprehensive income (loss) 0 0
Others (book value) 0 1
Ending balance 4,106 3,453
Chester Solar I SpA    
Book value [Abstract]    
Beginning balance 1,621 1,157
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) (430) 472
Other comprehensive income (loss) (195) 107
Others (book value) 124 (115)
Ending balance 1,120 1,621
Solar Philippines Calatagan Corporation    
Book value [Abstract]    
Beginning balance 49,017 48,930
Acquisition 0 0
Disposal 0 0
Dividends received (5,961) (6,439)
Share of income (loss) 5,961 6,745
Other comprehensive income (loss) 9,214 (219)
Others (book value) 0 0
Ending balance 58,231 49,017
Saemangeum Solar Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 24,292 8,324
Acquisition 1 16,399
Disposal 0 0
Dividends received 0 0
Share of income (loss) (354) (431)
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 23,939 24,292
Chungsongmeon BongSan wind power Co., Ltd.    
Book value [Abstract]    
Beginning balance 4,124 2,764
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) (316) (232)
Other comprehensive income (loss) 0 1,592
Others (book value) 0 0
Ending balance 3,808 4,124
Jaeun Resident Wind Power Plant Co., Ltd.    
Book value [Abstract]    
Beginning balance 2,195 2,198
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) (237) (3)
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 1,958 2,195
DE Energia SpA    
Book value [Abstract]    
Beginning balance 8,187 8,665
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 0 506
Other comprehensive income (loss) 734 572
Others (book value) 0 (1,556)
Ending balance 8,921 8,187
Dangjin Eco Power Co., Ltd. (newly)    
Book value [Abstract]    
Beginning balance 25,523 25,661
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 274 96
Other comprehensive income (loss) 312 (237)
Others (book value) 0 3
Ending balance 26,109 25,523
Haemodum Solar Co., Ltd.    
Book value [Abstract]    
Beginning balance 3,065 2,940
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 16 140
Other comprehensive income (loss) 0 (15)
Others (book value) 0 0
Ending balance 3,081 3,065
Yangyang Wind Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 10,485 10,800
Acquisition 1,200 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) (488) (286)
Other comprehensive income (loss) (6) (29)
Others (book value) 0 0
Ending balance 11,191 10,485
Horus Solar, S.A. De C.V.    
Book value [Abstract]    
Beginning balance 3,394 3,403
Acquisition 0 1,665
Disposal 0 0
Dividends received 0 0
Share of income (loss) 2,396 (1,985)
Other comprehensive income (loss) 52 311
Others (book value) 0 0
Ending balance 5,842 3,394
Recursos Solares PV De Mexico II, S.A. De C.V.    
Book value [Abstract]    
Beginning balance 3,660 672
Acquisition 0 3,006
Disposal 0 0
Dividends received 0 0
Share of income (loss) 766 36
Other comprehensive income (loss) 110 (54)
Others (book value) 0 0
Ending balance 4,536 3,660
Sunmex Renovables, S.A. De C.V.    
Book value [Abstract]    
Beginning balance 240 222
Acquisition 1,371 85
Disposal 0 0
Dividends received 0 0
Share of income (loss) (49) (46)
Other comprehensive income (loss) 48 (21)
Others (book value) 0 0
Ending balance 1,610 240
Stavro Holding II AB    
Book value [Abstract]    
Beginning balance 9,277 5,625
Acquisition 8,684 3,305
Disposal 0 0
Dividends received 0 0
Share of income (loss) (55) (156)
Other comprehensive income (loss) (271) 346
Others (book value) (8) 157
Ending balance 17,627 9,277
Solaseado Solar Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 9,915 0
Acquisition 0 7,020
Disposal 0 0
Dividends received 0 0
Share of income (loss) (24) 2,895
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 9,891 9,915
Yeongam Solar Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 6,042 0
Acquisition 0 6,460
Disposal 0 0
Dividends received 0 0
Share of income (loss) 796 (418)
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 6,838 6,042
Samsu Wind Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 2,607 0
Acquisition 0 2,637
Disposal 0 0
Dividends received 0 0
Share of income (loss) 221 (30)
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 2,828 2,607
Pulau Indah Power Plant Sdn. Bhd.    
Book value [Abstract]    
Beginning balance 11,204 0
Acquisition 12,264 11,569
Disposal 0 0
Dividends received 0 0
Share of income (loss) (519) (144)
Other comprehensive income (loss) (850) (221)
Others (book value) 0 0
Ending balance 22,099 11,204
Sam-Yang Photovoltaic Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 5,535 0
Acquisition 0 5,245
Disposal 0 0
Dividends received 0 0
Share of income (loss) (542) 290
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 4,993 5,535
NH-Amundi Global Infrastructure Investment Private Investment Trust 21    
Book value [Abstract]    
Beginning balance 22,242 0
Acquisition 0 20,952
Disposal (969) 0
Dividends received (1,727) (1,388)
Share of income (loss) 1,910 2,678
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 21,456 22,242
Shin-han BNPP Private Investment Trust for East-West Sunlight Dream    
Book value [Abstract]    
Beginning balance 16,129 0
Acquisition 0 15,699
Disposal 0 0
Dividends received 0 0
Share of income (loss) 159 430
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 16,288 16,129
PT Barito Wahana Tenaga    
Book value [Abstract]    
Beginning balance 63,029 0
Acquisition 140 59,395
Disposal 0 0
Dividends received 0 0
Share of income (loss) 4,194 4,923
Other comprehensive income (loss) 14,232 (1,289)
Others (book value) 0 0
Ending balance 81,595 63,029
Cheongna Energy Co., Ltd.    
Book value [Abstract]    
Beginning balance 4,940 0
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 6,258 21
Other comprehensive income (loss) 0 0
Others (book value) 0 4,919
Ending balance 11,198 4,940
Naepo Green Energy Co., Ltd.    
Book value [Abstract]    
Beginning balance 0 0
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 0 0
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 0 0
Dayone Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.)    
Book value [Abstract]    
Beginning balance 0 0
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of income (loss) 0 0
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 0 0
OneEnergy Asia Limited    
Book value [Abstract]    
Beginning balance 56,654 0
Acquisition 20,262 56,654
Disposal 0 0
Dividends received 0 0
Share of income (loss) (1,138) 0
Other comprehensive income (loss) 3,922 0
Others (book value) 0 0
Ending balance 79,700 56,654
KAS Investment I LLC    
Book value [Abstract]    
Beginning balance 23,437 0
Acquisition 0 23,437
Disposal 0 0
Dividends received 0 0
Share of income (loss) (6,876) 0
Other comprehensive income (loss) (1,288) 0
Others (book value) 0 0
Ending balance 15,273 23,437
KAS Investment II LLC    
Book value [Abstract]    
Beginning balance 23,343 0
Acquisition 0 23,343
Disposal 0 0
Dividends received 0 0
Share of income (loss) (6,515) 0
Other comprehensive income (loss) (1,615) 0
Others (book value) 0 0
Ending balance 15,213 23,343
Energyco LLC    
Book value [Abstract]    
Beginning balance 1,659 0
Acquisition 0 1,659
Disposal 0 0
Dividends received 0 0
Share of income (loss) (60) 0
Other comprehensive income (loss) (64) 0
Others (book value) 0 0
Ending balance 1,535 1,659
CAES, LLC    
Book value [Abstract]    
Beginning balance 17,626 0
Acquisition 0 19,414
Disposal 0 0
Dividends received (1,009) (297)
Share of income (loss) (331) 0
Other comprehensive income (loss) 850 0
Others (book value) 1,299 (1,491)
Ending balance 18,435 17,626
Hapcheon Floating Photovoltaic Power Plant Inc.    
Book value [Abstract]    
Beginning balance 1,890 0
Acquisition 5,622 1,890
Disposal 0 0
Dividends received 0 0
Share of income (loss) (541) 0
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 6,971 1,890
Busan Industrial Solar Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 510 0
Acquisition 0 510
Disposal 0 0
Dividends received 0 0
Share of income (loss) 102 0
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 612 510
Bitsolar Energy Co., Ltd.,    
Book value [Abstract]    
Beginning balance 352 0
Acquisition 0 352
Disposal 0 0
Dividends received 0 0
Share of income (loss) 0 0
Other comprehensive income (loss) 0 0
Others (book value) 0 0
Ending balance 352 352
Pulau Indah O&M Sdn. Bhd.    
Book value [Abstract]    
Beginning balance 0  
Acquisition 0  
Disposal 0  
Dividends received 0  
Share of income (loss) 0  
Other comprehensive income (loss) 0  
Others (book value) 0  
Ending balance 0 0
Guadalupe Solar SpA    
Book value [Abstract]    
Beginning balance 0  
Acquisition 1,397  
Disposal 0  
Dividends received 0  
Share of income (loss) (672)  
Other comprehensive income (loss) (66)  
Others (book value) 0  
Ending balance 659 0
Omisan Wind Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 0  
Acquisition 10,752  
Disposal 0  
Dividends received 0  
Share of income (loss) (119)  
Other comprehensive income (loss) 0  
Others (book value) 0  
Ending balance 10,633 0
Foresight Iberian Solar Group Holding, S.L.    
Book value [Abstract]    
Beginning balance 0  
Acquisition 0  
Disposal 0  
Dividends received 0  
Share of income (loss) 72  
Other comprehensive income (loss) 0  
Others (book value) 9,671  
Ending balance 9,743 0
Yeongwol Eco Wind Co., Ltd.    
Book value [Abstract]    
Beginning balance 0  
Acquisition 3,089  
Disposal 0  
Dividends received 0  
Share of income (loss) 122  
Other comprehensive income (loss) (15)  
Others (book value) 0  
Ending balance 3,196 0
Gurae Resident Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 0  
Acquisition 386  
Disposal 0  
Dividends received 0  
Share of income (loss) 12  
Other comprehensive income (loss) (3)  
Others (book value) 0  
Ending balance 395 0
Cheongju Eco Park Co., Ltd.    
Book value [Abstract]    
Beginning balance 0  
Acquisition 5,858  
Disposal 0  
Dividends received 0  
Share of income (loss) (393)  
Other comprehensive income (loss) 0  
Others (book value) 0  
Ending balance 5,465 0
Enel X Midland Photovoltaic, LLC    
Book value [Abstract]    
Beginning balance 0  
Acquisition 1,695  
Disposal 0  
Dividends received 0  
Share of income (loss) (7)  
Other comprehensive income (loss) 0  
Others (book value) 0  
Ending balance 1,688 0
Geumsungsan Wind Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 0  
Acquisition 6,531  
Disposal 0  
Dividends received 0  
Share of income (loss) (478)  
Other comprehensive income (loss) 0  
Others (book value) 0  
Ending balance 6,053 0
KEPCO KPS Carabao Corp.    
Book value [Abstract]    
Beginning balance 0  
Acquisition 93  
Disposal 0  
Dividends received 0  
Share of income (loss) 293  
Other comprehensive income (loss) 0  
Others (book value) 0  
Ending balance 386 0
Prime Swedish Holding AB    
Book value [Abstract]    
Beginning balance 0  
Acquisition 8,155  
Disposal 0  
Dividends received 0  
Share of income (loss) 22  
Other comprehensive income (loss) 1,060  
Others (book value) 6,204  
Ending balance 15,441 0
Goheung New Energy Co., Ltd.    
Book value [Abstract]    
Beginning balance 0  
Acquisition 12,959  
Disposal 0  
Dividends received 0  
Share of income (loss) (1,251)  
Other comprehensive income (loss) 0  
Others (book value) 0  
Ending balance 11,708 0
Gunsan Land Solar Co., Ltd.    
Book value [Abstract]    
Beginning balance 0  
Acquisition 19,091  
Disposal 0  
Dividends received 0  
Share of income (loss) 324  
Other comprehensive income (loss) (98)  
Others (book value) 0  
Ending balance 19,317 0
Capman Lynx SCA, SICAR    
Book value [Abstract]    
Beginning balance 0  
Acquisition 9,601  
Disposal 0  
Dividends received 0  
Share of income (loss) 375  
Other comprehensive income (loss) 0  
Others (book value) 0  
Ending balance 9,976 0
International Offshore Power Transmission Holding Company Limited    
Book value [Abstract]    
Beginning balance 0  
Acquisition 0  
Disposal 0  
Dividends received 0  
Share of income (loss) 0  
Other comprehensive income (loss) 0  
Others (book value) 0  
Ending balance ₩ 0 ₩ 0
[1] The effective percentage of ownership is more than 50%. However, according to the shareholders’ agreement, all critical financial and operating decisions must be agreed to by all ownership parties. Accordingly, the entities are classified as joint ventures.