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Investments in Joint Ventures 1 (Details) - KRW (₩) ₩ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of joint ventures [line items] |  |  |  |
Acquisition cost | ₩ 2,069,491 |  | ₩ 1,943,392 |
Total acquisition cost | 5,129,326 |  | 4,425,153 |
Book value [Abstract] |  |  |  |
Total book value | 7,471,384 |  | 6,170,533 |
Book value | ₩ 2,239,011 |  | ₩ 1,919,746 | ₩ 1,663,029
KEPCO-Uhde Inc. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Korea |  | Korea |
Percentage of ownership | 52.80% | [1] | 52.80% |
Acquisition cost | ₩ 11,355 | [1] | ₩ 11,355 |
Book value [Abstract] |  |  |  |
Book value | ₩ 58 | [1] | ₩ 100 |
Shuweihat Asia Power Investment B.V. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Holding company |  | Holding company |
Location | Netherlands |  | Netherlands |
Percentage of ownership | 49.00% |  | 49.00% |
Acquisition cost | ₩ 44,405 |  | ₩ 44,405 |
Book value [Abstract] |  |  |  |
Book value | ₩ 37,069 |  | ₩ 13,264 | 18,318
Shuweihat Asia Operation & Maintenance Company |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Maintenance of utility plant | [1] | Maintenance of utility plant |
Location | Cayman | [1] | Cayman |
Percentage of ownership | 55.00% | [1] | 55.00% |
Acquisition cost | ₩ 30 | [1] | ₩ 30 |
Book value [Abstract] |  |  |  |
Book value | ₩ 1,380 | [1] | ₩ 1,057 | 1,408
Waterbury Lake Uranium L.P. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Resources development |  | Resources development |
Location | Canada |  | Canada |
Percentage of ownership | 33.10% |  | 33.10% |
Acquisition cost | ₩ 26,602 |  | ₩ 26,602 |
Book value [Abstract] |  |  |  |
Book value | ₩ 21,590 |  | ₩ 19,797 | 20,562
ASM-BG Investicii AD |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Bulgaria |  | Bulgaria |
Percentage of ownership | 50.00% |  | 50.00% |
Acquisition cost | ₩ 16,101 |  | ₩ 16,101 |
Book value [Abstract] |  |  |  |
Book value | ₩ 18,692 |  | ₩ 18,200 | 19,376
RES Technology AD |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Bulgaria |  | Bulgaria |
Percentage of ownership | 50.00% |  | 50.00% |
Acquisition cost | ₩ 15,595 |  | ₩ 15,595 |
Book value [Abstract] |  |  |  |
Book value | ₩ 16,703 |  | ₩ 15,930 | 16,248
KV Holdings, Inc. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Philippines |  | Philippines |
Percentage of ownership | 40.00% |  | 40.00% |
Acquisition cost | ₩ 2,103 |  | ₩ 2,103 |
Book value [Abstract] |  |  |  |
Book value | ₩ 2,527 |  | ₩ 2,405 | 2,441
KEPCO SPC Power Corporation |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Construction and operation of utility plant | [1] | Construction and operation of utility plant |
Location | Philippines | [1] | Philippines |
Percentage of ownership | 75.20% | [1] | 75.20% |
Acquisition cost | ₩ 94,579 | [1] | ₩ 94,579 |
Book value [Abstract] |  |  |  |
Book value | ₩ 198,979 | [1] | ₩ 201,663 | 214,794
Gansu Datang Yumen Wind Power Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | China |  | China |
Percentage of ownership | 40.00% |  | 40.00% |
Acquisition cost | ₩ 16,621 |  | ₩ 16,621 |
Book value [Abstract] |  |  |  |
Book value | ₩ 6,635 |  | ₩ 6,530 | 8,149
Datang Chifeng Renewable Power Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | China |  | China |
Percentage of ownership | 40.00% |  | 40.00% |
Acquisition cost | ₩ 121,928 |  | ₩ 121,928 |
Book value [Abstract] |  |  |  |
Book value | ₩ 204,587 |  | ₩ 188,478 | 185,307
Datang KEPCO Chaoyang Renewable Power Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | China |  | China |
Percentage of ownership | 40.00% |  | 40.00% |
Acquisition cost | ₩ 39,872 |  | ₩ 39,872 |
Book value [Abstract] |  |  |  |
Book value | ₩ 44,217 |  | ₩ 42,530 | 41,024
Rabigh Electricity Company |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Saudi Arabia |  | Saudi Arabia |
Percentage of ownership | 40.00% |  | 40.00% |
Acquisition cost | ₩ 109,743 |  | ₩ 109,743 |
Book value [Abstract] |  |  |  |
Book value | ₩ 143,678 |  | ₩ 97,157 | 109,096
Rabigh Operation & Maintenance Company Limited |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Maintenance of utility plant |  | Maintenance of utility plant |
Location | Saudi Arabia |  | Saudi Arabia |
Percentage of ownership | 40.00% |  | 40.00% |
Acquisition cost | ₩ 70 |  | ₩ 70 |
Book value [Abstract] |  |  |  |
Book value | ₩ 4,071 |  | ₩ 3,813 | 6,879
Jamaica Public Service Company Limited |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Jamaica |  | Jamaica |
Percentage of ownership | 40.00% |  | 40.00% |
Acquisition cost | ₩ 301,910 |  | ₩ 301,910 |
Book value [Abstract] |  |  |  |
Book value | ₩ 294,649 |  | ₩ 266,221 | 253,607
KW Nuclear Components Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Manufacturing |  | Manufacturing |
Location | Korea |  | Korea |
Percentage of ownership | 45.00% |  | 45.00% |
Acquisition cost | ₩ 833 |  | ₩ 833 |
Book value [Abstract] |  |  |  |
Book value | ₩ 15,734 |  | ₩ 11,171 | 9,052
Busan Shinho Solar Power Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Korea |  | Korea |
Percentage of ownership | 25.00% |  | 25.00% |
Acquisition cost | ₩ 2,100 |  | ₩ 2,100 |
Book value [Abstract] |  |  |  |
Book value | ₩ 5,841 |  | ₩ 5,378 | 5,045
Global Trade Of Power System Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Exporting products and technology of small or medium business by proxy |  | Exporting products and technology of small or medium business by proxy |
Location | Korea |  | Korea |
Percentage of ownership | 29.00% |  | 29.00% |
Acquisition cost | ₩ 290 |  | ₩ 290 |
Book value [Abstract] |  |  |  |
Book value | ₩ 597 |  | ₩ 546 | 571
Expressway Solar-light Power Generation Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Korea |  | Korea |
Percentage of ownership | 29.00% |  | 29.00% |
Acquisition cost | ₩ 1,856 |  | ₩ 1,856 |
Book value [Abstract] |  |  |  |
Book value | ₩ 3,084 |  | ₩ 2,896 | 2,883
Amman Asia Electric Power Company |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Jordan |  | Jordan |
Percentage of ownership | 60.00% |  | 60.00% |
Acquisition cost | ₩ 111,476 |  | ₩ 111,476 |
Book value [Abstract] |  |  |  |
Book value | ₩ 178,679 |  | ₩ 161,253 | 192,164
KAPES, Inc. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | R & D |  | R & D |
Location | Korea |  | Korea |
Percentage of ownership | 51.00% |  | 51.00% |
Acquisition cost | ₩ 5,629 |  | ₩ 5,629 |
Book value [Abstract] |  |  |  |
Book value | ₩ 0 |  | ₩ 0 | 10,832
Honam Wind Power Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Korea |  | Korea |
Percentage of ownership | 29.00% |  | 29.00% |
Acquisition cost | ₩ 3,480 |  | ₩ 3,480 |
Book value [Abstract] |  |  |  |
Book value | 4,041 |  | ₩ 3,887 | 4,375
Jeongam Wind Power Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities |  |  | Power generation |
Location |  |  | Korea |
Percentage of ownership |  |  | 40.00% |
Acquisition cost |  |  | ₩ 5,580 |
Book value [Abstract] |  |  |  |
Book value | ₩ 0 |  | ₩ 4,620 | 4,437
Korea Power Engineering Service Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Construction and service |  | Construction and service |
Location | Korea |  | Korea |
Percentage of ownership | 29.00% |  | 29.00% |
Acquisition cost | ₩ 290 |  | ₩ 290 |
Book value [Abstract] |  |  |  |
Book value | ₩ 5,415 |  | ₩ 5,362 | 4,902
Chun-cheon Energy Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Korea |  | Korea |
Percentage of ownership | 29.90% |  | 29.90% |
Acquisition cost | ₩ 52,700 |  | ₩ 52,700 |
Book value [Abstract] |  |  |  |
Book value | ₩ 25,896 |  | ₩ 27,518 | 34,872
Yeonggwangbaeksu Wind Power Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Korea |  | Korea |
Percentage of ownership | 15.00% |  | 15.00% |
Acquisition cost | ₩ 3,000 |  | ₩ 3,000 |
Book value [Abstract] |  |  |  |
Book value | ₩ 2,728 |  | ₩ 3,124 | 3,040
Nghi Son 2 Power LLC |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Vietnam |  | Vietnam |
Percentage of ownership | 50.00% |  | 50.00% |
Acquisition cost | ₩ 2,781 |  | ₩ 2,781 |
Book value [Abstract] |  |  |  |
Book value | ₩ 0 |  | ₩ 0 | 0
Kelar S.A |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Chile |  | Chile |
Percentage of ownership | 65.00% |  | 65.00% |
Acquisition cost | ₩ 78,060 |  | ₩ 78,060 |
Book value [Abstract] |  |  |  |
Book value | ₩ 86,695 |  | ₩ 71,449 | 70,462
PT. Tanjung Power Indonesia |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Indonesia |  | Indonesia |
Percentage of ownership | 35.00% |  | 35.00% |
Acquisition cost | ₩ 26,892 |  | ₩ 26,892 |
Book value [Abstract] |  |  |  |
Book value | ₩ 46,546 |  | ₩ 33,063 | 34,327
Incheon New Power Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Korea |  | Korea |
Percentage of ownership | 29.00% |  | 29.00% |
Acquisition cost | ₩ 461 |  | ₩ 461 |
Book value [Abstract] |  |  |  |
Book value | ₩ 0 |  | ₩ 0 | 0
Seokmun Energy Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Korea |  | Korea |
Percentage of ownership | 29.00% |  | 29.00% |
Acquisition cost | ₩ 15,370 |  | ₩ 15,370 |
Book value [Abstract] |  |  |  |
Book value | ₩ 13,842 |  | ₩ 14,814 | 17,342
Daehan Wind Power PSC |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Jordan |  | Jordan |
Percentage of ownership | 50.00% |  | 50.00% |
Acquisition cost | ₩ 7,493 |  | ₩ 7,493 |
Book value [Abstract] |  |  |  |
Book value | ₩ 5,154 |  | ₩ 0 | 1,757
Barakah One Company |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | UAE |  | UAE |
Percentage of ownership | 18.00% |  | 18.00% |
Acquisition cost | ₩ 118 |  | ₩ 118 |
Book value [Abstract] |  |  |  |
Book value | ₩ 0 |  | ₩ 0 | 0
Nawah Energy Company |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Operation of utility plant |  | Operation of utility plant |
Location | UAE |  | UAE |
Percentage of ownership | 18.00% |  | 18.00% |
Acquisition cost | ₩ 296 |  | ₩ 296 |
Book value [Abstract] |  |  |  |
Book value | ₩ 294 |  | ₩ 270 | 285
Momentum |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | International thermonuclear experimental reactor construction management |  | International thermonuclear experimental reactor construction management |
Location | France |  | France |
Percentage of ownership | 33.33% |  | 33.33% |
Acquisition cost | ₩ 1 |  | ₩ 1 |
Book value [Abstract] |  |  |  |
Book value | ₩ 368 |  | ₩ 565 | 553
Daegu Green Power Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Korea |  | Korea |
Percentage of ownership | 29.00% |  | 29.00% |
Acquisition cost | ₩ 46,225 |  | ₩ 46,225 |
Book value [Abstract] |  |  |  |
Book value | ₩ 24,054 |  | ₩ 23,045 | 22,824
Yeonggwang Wind Power Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Korea |  | Korea |
Percentage of ownership | 46.00% |  | 46.00% |
Acquisition cost | ₩ 17,475 |  | ₩ 17,475 |
Book value [Abstract] |  |  |  |
Book value | ₩ 17,646 |  | ₩ 17,256 | 17,627
Chester Solar IV SpA |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Chile |  | Chile |
Percentage of ownership | 45.00% |  | 45.00% |
Acquisition cost | ₩ 1,700 |  | ₩ 1,700 |
Book value [Abstract] |  |  |  |
Book value | ₩ 0 |  | ₩ 1,064 | 672
Chester Solar V SpA |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Chile |  | Chile |
Percentage of ownership | 45.00% |  | 45.00% |
Acquisition cost | ₩ 525 |  | ₩ 525 |
Book value [Abstract] |  |  |  |
Book value | ₩ 25 |  | ₩ 277 | 146
Diego de Almagro Solar SpA |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Chile |  | Chile |
Percentage of ownership | 45.00% |  | 45.00% |
Acquisition cost | ₩ 2,091 |  | ₩ 2,091 |
Book value [Abstract] |  |  |  |
Book value | ₩ 362 |  | ₩ 1,490 | 1,035
South Jamaica Power Company Limited |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Jamaica |  | Jamaica |
Percentage of ownership | 20.00% |  | 20.00% |
Acquisition cost | ₩ 20,430 |  | ₩ 20,521 |
Book value [Abstract] |  |  |  |
Book value | ₩ 37,360 |  | ₩ 31,897 | 13,863
Daesan Green Energy Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Korea |  | Korea |
Percentage of ownership | 35.00% |  | 35.00% |
Acquisition cost | ₩ 17,850 |  | ₩ 17,850 |
Book value [Abstract] |  |  |  |
Book value | ₩ 21,244 |  | ₩ 22,552 | 17,182
RE Holiday Holdings LLC |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | USA |  | USA |
Percentage of ownership | 50.00% |  | 50.00% |
Acquisition cost | ₩ 42,948 |  | ₩ 42,948 |
Book value [Abstract] |  |  |  |
Book value | ₩ 73,167 |  | ₩ 68,809 | 42,070
RE Pioneer Holdings LLC |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | USA |  | USA |
Percentage of ownership | 50.00% |  | 50.00% |
Acquisition cost | ₩ 27,891 |  | ₩ 27,891 |
Book value [Abstract] |  |  |  |
Book value | ₩ 47,015 |  | ₩ 49,639 | 31,156
RE Barren Ridge 1 Holdings LLC |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | USA |  | USA |
Percentage of ownership | 50.00% |  | 50.00% |
Acquisition cost | ₩ 28,021 |  | ₩ 28,021 |
Book value [Abstract] |  |  |  |
Book value | ₩ 1,883 |  | ₩ 4,466 | 42,916
RE Astoria 2 LandCo LLC |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | USA |  | USA |
Percentage of ownership | 50.00% |  | 50.00% |
Acquisition cost | ₩ 5,188 |  | ₩ 5,188 |
Book value [Abstract] |  |  |  |
Book value | ₩ 5,998 |  | ₩ 5,230 | 5,602
RE Barren Ridge LandCo LLC |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | USA |  | USA |
Percentage of ownership | 50.00% |  | 50.00% |
Acquisition cost | ₩ 2,187 |  | ₩ 2,187 |
Book value [Abstract] |  |  |  |
Book value | ₩ 2,120 |  | ₩ 1,847 | 1,966
Laurel SpA |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Chile |  | Chile |
Percentage of ownership | 45.00% |  | 45.00% |
Acquisition cost | ₩ 1,222 |  | ₩ 1,222 |
Book value [Abstract] |  |  |  |
Book value | ₩ 290 |  | ₩ 1,092 | 595
KIAMCO KOWEPO Bannerton Hold Co Pty Ltd |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Australia |  | Australia |
Percentage of ownership | 12.37% |  | 12.37% |
Acquisition cost | ₩ 4,095 |  | ₩ 4,095 |
Book value [Abstract] |  |  |  |
Book value | ₩ 3,625 |  | ₩ 4,129 | 4,024
Chile Solar JV SpA |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Chile |  | Chile |
Percentage of ownership | 50.00% |  | 50.00% |
Acquisition cost | ₩ 37,689 |  | ₩ 37,689 |
Book value [Abstract] |  |  |  |
Book value | 32,457 |  | ₩ 34,883 | 34,859
Taebaek Gadeoksan Wind Power Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities |  |  | Power generation |
Location |  |  | Korea |
Percentage of ownership |  |  | 47.31% |
Acquisition cost |  |  | ₩ 12,570 |
Book value [Abstract] |  |  |  |
Book value | ₩ 0 |  | ₩ 13,362 | 7,846
Cheong-Song Noraesan Wind Power Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Korea |  | Korea |
Percentage of ownership | 29.01% |  | 29.01% |
Acquisition cost | ₩ 3,200 |  | ₩ 3,200 |
Book value [Abstract] |  |  |  |
Book value | ₩ 4,106 |  | ₩ 3,453 | 3,043
Chester Solar I SpA |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Chile |  | Chile |
Percentage of ownership | 45.00% |  | 45.00% |
Acquisition cost | ₩ 1,181 |  | ₩ 1,181 |
Book value [Abstract] |  |  |  |
Book value | ₩ 1,120 |  | ₩ 1,621 | 1,157
Solar Philippines Calatagan Corporation |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Philippines |  | Philippines |
Percentage of ownership | 38.00% |  | 38.00% |
Acquisition cost | ₩ 47,903 |  | ₩ 47,903 |
Book value [Abstract] |  |  |  |
Book value | ₩ 58,231 |  | ₩ 49,017 | 48,930
Saemangeum Solar Power Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Korea |  | Korea |
Percentage of ownership | 81.01% |  | 81.00% |
Acquisition cost | ₩ 26,400 |  | ₩ 26,399 |
Book value [Abstract] |  |  |  |
Book value | ₩ 23,939 |  | ₩ 24,292 | 8,324
Chungsongmeon BongSan wind power Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Korea |  | Korea |
Percentage of ownership | 29.00% |  | 29.00% |
Acquisition cost | ₩ 2,900 |  | ₩ 2,900 |
Book value [Abstract] |  |  |  |
Book value | ₩ 3,808 |  | ₩ 4,124 | 2,764
Jaeun Resident Wind Power Plant Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Korea |  | Korea |
Percentage of ownership | 29.00% |  | 29.00% |
Acquisition cost | ₩ 2,494 |  | ₩ 2,494 |
Book value [Abstract] |  |  |  |
Book value | ₩ 1,958 |  | ₩ 2,195 | 2,198
DE Energia SpA |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Chile |  | Chile |
Percentage of ownership | 49.00% |  | 49.00% |
Acquisition cost | ₩ 8,364 |  | ₩ 8,364 |
Book value [Abstract] |  |  |  |
Book value | ₩ 8,921 |  | ₩ 8,187 | 8,665
Dangjin Eco Power Co., Ltd. (newly) |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Korea |  | Korea |
Percentage of ownership | 34.00% |  | 34.00% |
Acquisition cost | ₩ 25,661 |  | ₩ 25,661 |
Book value [Abstract] |  |  |  |
Book value | ₩ 26,109 |  | ₩ 25,523 | 25,661
Haemodum Solar Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Korea |  | Korea |
Percentage of ownership | 49.00% |  | 49.00% |
Acquisition cost | ₩ 2,940 |  | ₩ 2,940 |
Book value [Abstract] |  |  |  |
Book value | ₩ 3,081 |  | ₩ 3,065 | 2,940
Yangyang Wind Power Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Korea |  | Korea |
Percentage of ownership | 50.00% |  | 50.00% |
Acquisition cost | ₩ 12,000 |  | ₩ 10,800 |
Book value [Abstract] |  |  |  |
Book value | ₩ 11,191 |  | ₩ 10,485 | 10,800
Horus Solar S.A. De C.V. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Renewable power generation |  | Renewable power generation |
Location | Mexico |  | Mexico |
Percentage of ownership | 14.95% |  | 14.95% |
Acquisition cost | ₩ 5,068 |  | ₩ 5,068 |
Book value [Abstract] |  |  |  |
Book value | ₩ 5,842 |  | ₩ 3,394 | 3,403
Recursos Solares PV De Mexico II, S.S. De C.V. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Renewable power generation |  | Renewable power generation |
Location | Mexico |  | Mexico |
Percentage of ownership | 14.95% |  | 14.95% |
Acquisition cost | ₩ 3,678 |  | ₩ 3,678 |
Book value [Abstract] |  |  |  |
Book value | ₩ 4,536 |  | ₩ 3,660 | 672
Sunmex Renovables, S.A. De C.V. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Renewable power generation |  | Renewable power generation |
Location | Mexico |  | Mexico |
Percentage of ownership | 14.95% |  | 14.95% |
Acquisition cost | ₩ 1,678 |  | ₩ 307 |
Book value [Abstract] |  |  |  |
Book value | ₩ 1,610 |  | ₩ 240 | 222
Stavro Holding II AB |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Holding company |  | Holding company |
Location | Sweden |  | Sweden |
Percentage of ownership | 20.00% |  | 20.00% |
Acquisition cost | ₩ 17,615 |  | ₩ 8,829 |
Book value [Abstract] |  |  |  |
Book value | ₩ 17,627 |  | ₩ 9,277 | 5,625
Solaseado Solar Power Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Korea |  | Korea |
Percentage of ownership | 38.90% |  | 38.90% |
Acquisition cost | ₩ 7,020 |  | ₩ 7,020 |
Book value [Abstract] |  |  |  |
Book value | ₩ 9,891 |  | ₩ 9,915 | 0
Yeongam Solar Power Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Korea |  | Korea |
Percentage of ownership | 19.00% |  | 19.00% |
Acquisition cost | ₩ 6,460 |  | ₩ 6,460 |
Book value [Abstract] |  |  |  |
Book value | ₩ 6,838 |  | ₩ 6,042 | 0
Samsu Wind Power Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Korea |  | Korea |
Percentage of ownership | 19.00% |  | 19.00% |
Acquisition cost | ₩ 2,637 |  | ₩ 2,637 |
Book value [Abstract] |  |  |  |
Book value | ₩ 2,828 |  | ₩ 2,607 | 0
Pulau Indah Power Plant Sdn. Bhd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Malaysia |  | Malaysia |
Percentage of ownership | 25.00% |  | 25.00% |
Acquisition cost | ₩ 23,833 |  | ₩ 11,569 |
Book value [Abstract] |  |  |  |
Book value | ₩ 22,099 |  | ₩ 11,204 | 0
Sam-Yang Photovoltaic Power Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Korea |  | Korea |
Percentage of ownership | 49.00% |  | 49.00% |
Acquisition cost | ₩ 5,245 |  | ₩ 5,245 |
Book value [Abstract] |  |  |  |
Book value | ₩ 4,993 |  | ₩ 5,535 | 0
NH-Amundi Global Infrastructure Investment Private Investment Trust 21 |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Holding company |  | Holding company |
Location | Korea |  | Korea |
Percentage of ownership | 29.53% |  | 29.53% |
Acquisition cost | ₩ 19,983 |  | ₩ 20,952 |
Book value [Abstract] |  |  |  |
Book value | ₩ 21,456 |  | ₩ 22,242 | 0
Shin-han BNPP Private Investment Trust for East-West Sunlight Dream |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Holding company |  | Holding company |
Location | Korea |  | Korea |
Percentage of ownership | 90.00% |  | 90.00% |
Acquisition cost | ₩ 15,699 |  | ₩ 15,699 |
Book value [Abstract] |  |  |  |
Book value | ₩ 16,288 |  | ₩ 16,129 | 0
PT Barito Wahana Tenaga |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Indonesia |  | Indonesia |
Percentage of ownership | 30.61% |  | 30.61% |
Acquisition cost | ₩ 59,535 |  | ₩ 59,395 |
Book value [Abstract] |  |  |  |
Book value | ₩ 81,595 |  | ₩ 63,029 | 0
Cheongna Energy Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Generating and distributing vapor and hot/cold water |  | Generating and distributing vapor and hot/cold water |
Location | Korea |  | Korea |
Percentage of ownership | 50.10% |  | 50.10% |
Acquisition cost | ₩ 49,344 |  | ₩ 49,344 |
Book value [Abstract] |  |  |  |
Book value | ₩ 11,198 |  | ₩ 4,940 | 0
Naepo Green Energy Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Korea |  | Korea |
Percentage of ownership | 29.20% |  | 29.20% |
Acquisition cost | ₩ 29,200 |  | ₩ 29,200 |
Book value [Abstract] |  |  |  |
Book value | ₩ 0 |  | ₩ 0 | 0
Dayone Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.) |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Korea |  | Korea |
Percentage of ownership | 30.66% |  | 30.66% |
Acquisition cost | ₩ 71,070 |  | ₩ 71,070 |
Book value [Abstract] |  |  |  |
Book value | ₩ 0 |  | ₩ 0 | 0
OneEnergy Asia Limited |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Vietnam |  | Vietnam |
Percentage of ownership | 40.00% |  | 40.00% |
Acquisition cost | ₩ 76,916 |  | ₩ 56,654 |
Book value [Abstract] |  |  |  |
Book value | ₩ 79,700 |  | ₩ 56,654 | 0
KAS Investment I LLC |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Holding company |  | Holding company |
Location | USA |  | USA |
Percentage of ownership | 29.89% |  | 29.89% |
Acquisition cost | ₩ 23,437 |  | ₩ 23,437 |
Book value [Abstract] |  |  |  |
Book value | ₩ 15,273 |  | ₩ 23,437 | 0
KAS Investment II LLC |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Holding company |  | Holding company |
Location | USA |  | USA |
Percentage of ownership | 29.89% |  | 29.89% |
Acquisition cost | ₩ 23,343 |  | ₩ 23,343 |
Book value [Abstract] |  |  |  |
Book value | 15,213 |  | ₩ 23,343 | 0
Energyco LLC |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities |  |  | Power generation |
Location |  |  | Korea |
Percentage of ownership |  |  | 29.00% |
Acquisition cost |  |  | ₩ 1,659 |
Book value [Abstract] |  |  |  |
Book value | ₩ 1,535 |  | ₩ 1,659 | 0
CAES, LLC |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Holding company |  | Holding company |
Location | USA |  | USA |
Percentage of ownership | 36.00% |  | 36.00% |
Acquisition cost | ₩ 19,414 |  | ₩ 19,414 |
Book value [Abstract] |  |  |  |
Book value | ₩ 18,435 |  | ₩ 17,626 | 0
Hapcheon Floating Photovoltaic Power Plant Inc. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Korea |  | Korea |
Percentage of ownership | 49.00% |  | 19.47% |
Acquisition cost | ₩ 7,512 |  | ₩ 1,890 |
Book value [Abstract] |  |  |  |
Book value | ₩ 6,971 |  | ₩ 1,890 | 0
Busan Industrial Solar Power Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Korea |  | Korea |
Percentage of ownership | 28.02% |  | 28.02% |
Acquisition cost | ₩ 510 |  | ₩ 510 |
Book value [Abstract] |  |  |  |
Book value | ₩ 612 |  | ₩ 510 | 0
Bitsolar Energy Co., Ltd., |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  | Power generation |
Location | Korea |  | Korea |
Percentage of ownership | 27.10% |  | 27.10% |
Acquisition cost | ₩ 352 |  | ₩ 352 |
Book value [Abstract] |  |  |  |
Book value | ₩ 352 |  | 352 | ₩ 0
Energyco Co., Ltd. (formerly, Energyco LLC) |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  |  |
Location | Korea |  |  |
Percentage of ownership | 29.00% |  |  |
Acquisition cost | ₩ 1,659 |  |  |
Book value [Abstract] |  |  |  |
Book value | ₩ 1,535 |  |  |
Pulau Indah O&M Sdn. Bhd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  |  |
Location | Malaysia |  |  |
Percentage of ownership | 60.00% |  |  |
Acquisition cost | ₩ 0 |  |  |
Book value [Abstract] |  |  |  |
Book value | ₩ 0 |  |  |
Guadalupe Solar SpA |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  |  |
Location | Chile |  |  |
Percentage of ownership | 60.00% |  |  |
Acquisition cost | ₩ 1,397 |  |  |
Book value [Abstract] |  |  |  |
Book value | ₩ 659 |  | 0 |
Omisan Wind Power Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  |  |
Location | Korea |  |  |
Percentage of ownership | 42.00% |  |  |
Acquisition cost | ₩ 10,752 |  |  |
Book value [Abstract] |  |  |  |
Book value | ₩ 10,633 |  | 0 |
Foresight Iberian Solar Group Holding, S.L |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  |  |
Location | Spain |  |  |
Percentage of ownership | 75.00% |  |  |
Acquisition cost | ₩ 9,697 |  |  |
Book value [Abstract] |  |  |  |
Book value | ₩ 9,743 |  |  |
Yeongwol Eco Wind Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  |  |
Location | Korea |  |  |
Percentage of ownership | 29.00% |  |  |
Acquisition cost | ₩ 3,089 |  |  |
Book value [Abstract] |  |  |  |
Book value | ₩ 3,196 |  | 0 |
Gurae Resident Power Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  |  |
Location | Korea |  |  |
Percentage of ownership | 29.00% |  |  |
Acquisition cost | ₩ 386 |  |  |
Book value [Abstract] |  |  |  |
Book value | ₩ 395 |  | 0 |
Cheongju Eco Park Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  |  |
Location | Korea |  |  |
Percentage of ownership | 29.00% |  |  |
Acquisition cost | ₩ 5,858 |  |  |
Book value [Abstract] |  |  |  |
Book value | ₩ 5,465 |  | 0 |
Enel X Midland Photovoltaic, LLC |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  |  |
Location | Korea |  |  |
Percentage of ownership | 20.00% |  |  |
Acquisition cost | ₩ 1,695 |  |  |
Book value [Abstract] |  |  |  |
Book value | ₩ 1,688 |  | 0 |
Geumsungsan Wind Power Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  |  |
Location | Korea |  |  |
Percentage of ownership | 29.00% |  |  |
Acquisition cost | ₩ 6,531 |  |  |
Book value [Abstract] |  |  |  |
Book value | ₩ 6,053 |  | 0 |
KEPCO KPS Carabao Corp. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Utility plant maintenance |  |  |
Location | Philippines |  |  |
Percentage of ownership | 40.00% |  |  |
Acquisition cost | ₩ 93 |  |  |
Book value [Abstract] |  |  |  |
Book value | ₩ 386 |  | 0 |
Prime Swedish Holding AB |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Holding company |  |  |
Location | Sweden |  |  |
Percentage of ownership | 45.00% |  |  |
Acquisition cost | ₩ 14,514 |  |  |
Book value [Abstract] |  |  |  |
Book value | ₩ 15,441 |  | 0 |
Goheung New Energy Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  |  |
Location | Korea |  |  |
Percentage of ownership | 46.15% |  |  |
Acquisition cost | ₩ 12,959 |  |  |
Book value [Abstract] |  |  |  |
Book value | ₩ 11,708 |  | 0 |
Gunsan Land Solar Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Power generation |  |  |
Location | Korea |  |  |
Percentage of ownership | 75.29% |  |  |
Acquisition cost | ₩ 19,091 |  |  |
Book value [Abstract] |  |  |  |
Book value | ₩ 19,317 |  | 0 |
Capman Lynx SCA, SICAR |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Holding company |  |  |
Location | Luxembourg |  |  |
Percentage of ownership | 50.00% |  |  |
Acquisition cost | ₩ 9,601 |  |  |
Book value [Abstract] |  |  |  |
Book value | ₩ 9,976 |  | 0 |
International Offshore Power Transmission Holding Company Limited |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Key operation activities | Undersea transmission network operation |  |  |
Location | UAE |  |  |
Percentage of ownership | 35.00% |  |  |
Acquisition cost | ₩ 0 |  |  |
Book value [Abstract] |  |  |  |
Book value | ₩ 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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