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Investments in Joint Ventures 2 (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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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.

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- Definition The cash inflow representing dividends received from joint ventures, classified as investing activities. [Refer: Joint ventures [member]; Dividends received] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_16&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of investments in joint ventures accounted for using the equity method. [Refer: Joint ventures [member]; Investments accounted for using equity method] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 + Details
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