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Investments in Joint Ventures 1 (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of joint ventures [line items]      
Acquisition cost ₩ 2,332,579 ₩ 2,069,491  
Total acquisition cost 5,422,262 5,129,326  
Book value [Abstract]      
Total book value 8,992,048 7,471,384  
Book value ₩ 3,147,584 ₩ 2,239,011 ₩ 1,919,746
KEPCO-Uhde Inc.      
Disclosure of joint ventures [line items]      
Key operation activities Power generation [1] Power generation [2]  
Location KOREA [1] Korea [2]  
Percentage of ownership 52.80% [1] 52.80% [2]  
Acquisition cost ₩ 11,355 [1] ₩ 11,355 [2]  
Book value [Abstract]      
Book value ₩ 17 [1] ₩ 58 [2] 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 ₩ 66,452 ₩ 37,069 13,264
Shuweihat Asia Operation & Maintenance Company      
Disclosure of joint ventures [line items]      
Key operation activities Maintenance of utility plant [1] Maintenance of utility plant [2]  
Location CAYMAN [1] Cayman [2]  
Percentage of ownership 55.00% [1] 55.00% [2]  
Acquisition cost ₩ 30 [1] ₩ 30 [2]  
Book value [Abstract]      
Book value ₩ 1,631 [1] ₩ 1,380 [2] 1,057
Waterbury Lake Uranium L.P.      
Disclosure of joint ventures [line items]      
Key operation activities Resources development [3] Resources development  
Location CANADA [3] Canada  
Percentage of ownership 32.59% [3] 33.10%  
Acquisition cost ₩ 26,602 [3] ₩ 26,602  
Book value [Abstract]      
Book value ₩ 21,750 [3] ₩ 21,590 19,797
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 ₩ 9,846 ₩ 16,101  
Book value [Abstract]      
Book value ₩ 14,555 ₩ 18,692 18,200
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 ₩ 11,922 ₩ 15,595  
Book value [Abstract]      
Book value ₩ 15,133 ₩ 16,703 15,930
KV Holdings, Inc.      
Disclosure of joint ventures [line items]      
Key operation activities Power generation [4] Power generation  
Location PHILIPPINES [4] Philippines  
Percentage of ownership 40.00% [4] 40.00%  
Acquisition cost ₩ 2,103 [4] ₩ 2,103  
Book value [Abstract]      
Book value ₩ 9,659 [4] ₩ 2,527 2,405
KEPCO SPC Power Corporation      
Disclosure of joint ventures [line items]      
Key operation activities Construction and operation of utility plant [1],[4] Construction and operation of utility plant [2]  
Location PHILIPPINES [1],[4] Philippines [2]  
Percentage of ownership 75.20% [1],[4] 75.20% [2]  
Acquisition cost ₩ 94,579 [1],[4] ₩ 94,579 [2]  
Book value [Abstract]      
Book value ₩ 179,594 [1],[4] ₩ 198,979 [2] 201,663
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 ₩ 6,024 ₩ 6,635 6,530
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 ₩ 191,982 ₩ 204,587 188,478
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 ₩ 44,398 ₩ 44,217 42,530
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 ₩ 214,607 ₩ 143,678 97,157
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 ₩ 5,113 ₩ 4,071 3,813
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 ₩ 331,407 ₩ 294,649 266,221
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 ₩ 17,090 ₩ 15,734 11,171
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 ₩ 6,719 ₩ 5,841 5,378
Global Trade Of Power System Co., Ltd.      
Disclosure of joint ventures [line items]      
Key operation activities [5] Exporting products and technology of small or medium business by proxy Exporting products and technology of small or medium business by proxy  
Location [5] KOREA Korea  
Percentage of ownership [5] 29.00% 29.00%  
Acquisition cost [5] ₩ 290 ₩ 290  
Book value [Abstract]      
Book value ₩ 698 [5] ₩ 597 [5] 546
Expressway Solar-light Power Generation Co., Ltd.      
Disclosure of joint ventures [line items]      
Key operation activities Power generation [6] Power generation [5]  
Location KOREA [6] Korea [5]  
Percentage of ownership 50.00% [6] 29.00% [5]  
Acquisition cost ₩ 1,856 [6] ₩ 1,856 [5]  
Book value [Abstract]      
Book value ₩ 4,754 [6] ₩ 3,084 [5] 2,896
Amman Asia Electric Power Company      
Disclosure of joint ventures [line items]      
Key operation activities Power generation [1] Power generation [2]  
Location JORDAN [1] Jordan [2]  
Percentage of ownership 60.00% [1] 60.00% [2]  
Acquisition cost ₩ 111,476 [1] ₩ 111,476 [2]  
Book value [Abstract]      
Book value ₩ 220,254 [1] ₩ 178,679 [2] 161,253
KAPES, Inc.      
Disclosure of joint ventures [line items]      
Key operation activities R & D [1] R & D [2]  
Location KOREA [1] Korea [2]  
Percentage of ownership 51.00% [1] 51.00% [2]  
Acquisition cost ₩ 5,629 [1] ₩ 5,629 [2]  
Book value [Abstract]      
Book value ₩ 0 [1] ₩ 0 [2] 0
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 ₩ 4,819 ₩ 4,041 3,887
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 ₩ 5,543 ₩ 5,415 5,362
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 ₩ 32,044 ₩ 25,896 27,518
Yeonggwangbaeksu Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Key operation activities [5] Power generation Power generation  
Location [5] KOREA Korea  
Percentage of ownership [5] 15.00% 15.00%  
Acquisition cost [5] ₩ 3,000 ₩ 3,000  
Book value [Abstract]      
Book value ₩ 3,151 [5] ₩ 2,728 [5] 3,124
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 ₩ 175,261 ₩ 2,781  
Book value [Abstract]      
Book value ₩ 408,839 ₩ 0 0
Kelar S.A      
Disclosure of joint ventures [line items]      
Key operation activities Power generation [1] Power generation [2]  
Location CHILE [1] Chile [2]  
Percentage of ownership 65.00% [1] 65.00% [2]  
Acquisition cost ₩ 78,060 [1] ₩ 78,060 [2]  
Book value [Abstract]      
Book value ₩ 117,137 [1] ₩ 86,695 [2] 71,449
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 ₩ 57,039 ₩ 26,892  
Book value [Abstract]      
Book value ₩ 92,907 ₩ 46,546 33,063
Incheon New Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Key operation activities Power generation [7] Power generation [8]  
Location KOREA [7] Korea [8]  
Percentage of ownership 29.00% [7] 29.00% [8]  
Acquisition cost ₩ 461 [7] ₩ 461 [8]  
Book value [Abstract]      
Book value ₩ 198 [7] ₩ 0 [8] 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 ₩ 17,336 ₩ 13,842 14,814
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 ₩ 13,923 ₩ 5,154 0
Barakah One Company      
Disclosure of joint ventures [line items]      
Key operation activities [9] Power generation Power generation  
Location [9] UAE UAE  
Percentage of ownership [9] 18.00% 18.00%  
Acquisition cost [9] ₩ 118 ₩ 118  
Book value [Abstract]      
Book value ₩ 0 [9] ₩ 0 [9] 0
Nawah Energy Company      
Disclosure of joint ventures [line items]      
Key operation activities [9] Operation of utility plant Operation of utility plant  
Location [9] UAE UAE  
Percentage of ownership [9] 18.00% 18.00%  
Acquisition cost [9] ₩ 296 ₩ 296  
Book value [Abstract]      
Book value ₩ 315 [9] ₩ 294 [9] 270
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 ₩ 345 ₩ 368 565
Daegu Green Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Key operation activities [10] Power generation Power generation  
Location [10] KOREA Korea  
Percentage of ownership [10] 29.00% 29.00%  
Acquisition cost [10] ₩ 46,225 ₩ 46,225  
Book value [Abstract]      
Book value ₩ 29,360 [10] ₩ 24,054 [10] 23,045
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 ₩ 20,713 ₩ 17,646 17,256
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 ₩ 181 ₩ 0 1,064
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 ₩ 156 ₩ 25 277
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 ₩ 540 ₩ 362 1,490
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 ₩ 20,430  
Book value [Abstract]      
Book value ₩ 46,437 ₩ 37,360 31,897
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 ₩ 19,218 ₩ 21,244 22,552
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 ₩ 85,370 ₩ 73,167 68,809
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 ₩ 55,172 ₩ 47,015 49,639
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 ₩ 3,350 ₩ 1,883 4,466
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 ₩ 6,599 ₩ 5,998 5,230
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 ₩ 2,333 ₩ 2,120 1,847
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 ₩ 554 ₩ 290 1,092
KIAMCO KOWEPO Bannerton Hold Co Pty Ltd      
Disclosure of joint ventures [line items]      
Key operation activities [5] Power generation Power generation  
Location [5] AUSTRALIA Australia  
Percentage of ownership [5] 12.37% 12.37%  
Acquisition cost [5] ₩ 4,095 ₩ 4,095  
Book value [Abstract]      
Book value ₩ 3,651 [5] ₩ 3,625 [5] 4,129
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 ₩ 12,674 ₩ 37,689  
Book value [Abstract]      
Book value ₩ 9,819 ₩ 32,457 34,883
Cheong-Song Noraesan Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Key operation activities Power generation [3] Power generation  
Location KOREA [3] Korea  
Percentage of ownership 29.01% [3] 29.01%  
Acquisition cost ₩ 3,200 [3] ₩ 3,200  
Book value [Abstract]      
Book value ₩ 4,263 [3] ₩ 4,106 3,453
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 ₩ 1,314 ₩ 1,120 1,621
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 ₩ 56,902 ₩ 58,231 49,017
Saemangeum Solar Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Key operation activities [11] Power generation Power generation  
Location [11] KOREA Korea  
Percentage of ownership [11] 81.01% 81.01%  
Acquisition cost [11] ₩ 26,400 ₩ 26,400  
Book value [Abstract]      
Book value ₩ 23,551 [11] ₩ 23,939 [11] 24,292
Chungsongmeon BongSan wind power Co., Ltd.      
Disclosure of joint ventures [line items]      
Key operation activities [5] Power generation Power generation  
Location [5] KOREA Korea  
Percentage of ownership [5] 29.00% 29.00%  
Acquisition cost [5] ₩ 2,900 ₩ 2,900  
Book value [Abstract]      
Book value ₩ 3,470 [5] ₩ 3,808 [5] 4,124
Jaeun Resident Wind Power Plant Co., Ltd.      
Disclosure of joint ventures [line items]      
Key operation activities Power generation [5] Power generation  
Location KOREA [5] Korea  
Percentage of ownership 29.00% [5] 29.00%  
Acquisition cost ₩ 2,494 [5] ₩ 2,494  
Book value [Abstract]      
Book value ₩ 2,236 [5] ₩ 1,958 2,195
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 ₩ 9,536 ₩ 8,921 8,187
Dangjin Eco Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Key operation activities   Power generation  
Location   Korea  
Percentage of ownership   34.00%  
Acquisition cost   ₩ 25,661  
Book value [Abstract]      
Book value   26,109  
Dangjin Eco Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Key operation activities Power generation    
Location KOREA    
Percentage of ownership 34.00%    
Acquisition cost ₩ 25,661    
Book value [Abstract]      
Book value ₩ 26,859 ₩ 26,109 25,523
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 ₩ 3,367 ₩ 3,081 3,065
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 ₩ 12,000  
Book value [Abstract]      
Book value ₩ 10,864 ₩ 11,191 10,485
Horus Solar, S.A. De C.V.      
Disclosure of joint ventures [line items]      
Key operation activities Renewable power generation [12] Renewable power generation [13]  
Location MEXICO [12] Mexico [13]  
Percentage of ownership 14.95% [12] 14.95% [13]  
Acquisition cost ₩ 5,068 [12] ₩ 5,068 [13]  
Book value [Abstract]      
Book value ₩ 6,976 [12] ₩ 5,842 [13] 3,394
Recursos Solares PV De Mexico II, S.A. De C.V.      
Disclosure of joint ventures [line items]      
Key operation activities Renewable power generation [12] Renewable power generation [13]  
Location MEXICO [12] Mexico [13]  
Percentage of ownership 14.95% [12] 14.95% [13]  
Acquisition cost ₩ 3,678 [12] ₩ 3,678 [13]  
Book value [Abstract]      
Book value ₩ 4,899 [12] ₩ 4,536 [13] 3,660
Sunmex Renovables, S.A. De C.V.      
Disclosure of joint ventures [line items]      
Key operation activities Renewable power generation [12] Renewable power generation [13]  
Location MEXICO [12] Mexico [13]  
Percentage of ownership 14.95% [12] 14.95% [13]  
Acquisition cost ₩ 1,678 [12] ₩ 1,678 [13]  
Book value [Abstract]      
Book value ₩ 1,657 [12] ₩ 1,610 [13] 240
Stavro Holding II A.B.      
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 ₩ 18,566 ₩ 17,615  
Book value [Abstract]      
Book value ₩ 17,171 ₩ 17,627 9,277
Solaseado Solar Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 39.00% 38.90%  
Acquisition cost ₩ 7,020 ₩ 7,020  
Book value [Abstract]      
Book value ₩ 16,233 ₩ 9,891 9,915
Yeongam Solar Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Key operation activities [5] Power generation Power generation  
Location [5] KOREA Korea  
Percentage of ownership [5] 19.00% 19.00%  
Acquisition cost [5] ₩ 6,460 ₩ 6,460  
Book value [Abstract]      
Book value ₩ 9,879 [5] ₩ 6,838 [5] 6,042
Samsu Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Key operation activities [5] Power generation Power generation  
Location [5] KOREA Korea  
Percentage of ownership [5] 19.00% 19.00%  
Acquisition cost [5] ₩ 2,637 ₩ 2,637  
Book value [Abstract]      
Book value ₩ 3,205 [5] ₩ 2,828 [5] 2,607
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 ₩ 23,833  
Book value [Abstract]      
Book value 26,814 ₩ 22,099 11,204
Sam-Yang Photovoltaic Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Key operation activities   Power generation  
Location   Korea  
Percentage of ownership   49.00%  
Acquisition cost   ₩ 5,245  
Book value [Abstract]      
Book value ₩ 0 ₩ 4,993 5,535
NH-Amundi Global Infrastructure Investment Private Investment Trust 21      
Disclosure of joint ventures [line items]      
Key operation activities Holding company [11] Holding company  
Location KOREA [11] Korea  
Percentage of ownership 29.53% [11] 29.53%  
Acquisition cost ₩ 20,061 [11] ₩ 19,983  
Book value [Abstract]      
Book value ₩ 21,723 [11] ₩ 21,456 22,242
Shin-han BNPP Private Investment Trust for East-West Sunlight Dream      
Disclosure of joint ventures [line items]      
Key operation activities Holding company [1] Holding company [2]  
Location KOREA [1] Korea [2]  
Percentage of ownership 90.00% [1] 90.00% [2]  
Acquisition cost ₩ 15,012 [1] ₩ 15,699 [2]  
Book value [Abstract]      
Book value ₩ 15,587 [1] ₩ 16,288 [2] 16,129
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 ₩ 59,574 ₩ 59,535  
Book value [Abstract]      
Book value ₩ 137,047 ₩ 81,595 63,029
Cheongna Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Key operation activities [11] Generating and distributing vapor and hot/cold water Generating and distributing vapor and hot/cold water  
Location [11] KOREA Korea  
Percentage of ownership [11] 50.10% 50.10%  
Acquisition cost [11] ₩ 49,344 ₩ 49,344  
Book value [Abstract]      
Book value ₩ 10,758 [11] ₩ 11,198 [11] 4,940
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.      
Disclosure of joint ventures [line items]      
Key operation activities Power generation [14] Power generation [15]  
Location KOREA [14] Korea [15]  
Percentage of ownership 30.66% [14] 30.66% [15]  
Acquisition cost ₩ 71,070 [14] ₩ 71,070 [15]  
Book value [Abstract]      
Book value ₩ 0 [14] ₩ 0 [15] 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 ₩ 115,949 ₩ 76,916  
Book value [Abstract]      
Book value ₩ 172,218 ₩ 79,700 56,654
KAS Investment I LLC      
Disclosure of joint ventures [line items]      
Key operation activities Holding company [3] Holding company  
Location USA [3] USA  
Percentage of ownership 29.89% [3] 29.89%  
Acquisition cost ₩ 23,437 [3] ₩ 23,437  
Book value [Abstract]      
Book value ₩ 18,247 [3] ₩ 15,273 23,437
KAS Investment II LLC      
Disclosure of joint ventures [line items]      
Key operation activities Holding company [3] Holding company  
Location USA [3] USA  
Percentage of ownership 29.89% [3] 29.89%  
Acquisition cost ₩ 23,343 [3] ₩ 23,343  
Book value [Abstract]      
Book value ₩ 18,173 [3] ₩ 15,213 23,343
Energyco 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 ₩ 1,659 ₩ 1,659  
Book value [Abstract]      
Book value ₩ 2,190 ₩ 1,535  
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 ₩ 20,805 ₩ 18,435 17,626
Hapcheon Floating Photovoltaic Power Plant Inc.      
Disclosure of joint ventures [line items]      
Key operation activities [5] Power generation Power generation  
Location [5] KOREA Korea  
Percentage of ownership [5] 49.00% 49.00%  
Acquisition cost [5] ₩ 7,512 ₩ 7,512  
Book value [Abstract]      
Book value ₩ 8,471 [5] ₩ 6,971 [5] 1,890
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 ₩ 1,168 ₩ 612 510
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 ₩ 352 352
Pulau Indah O&M Sdn. Bhd.      
Disclosure of joint ventures [line items]      
Key operation activities [11] Power generation Power generation  
Location [11] MALAYSIA Malaysia  
Percentage of ownership [11] 60.00% 60.00%  
Acquisition cost [11] ₩ 0 ₩ 0  
Book value [Abstract]      
Book value [11] ₩ 0 ₩ 0  
Guadalupe Solar SpA      
Disclosure of joint ventures [line items]      
Key operation activities [11] Power generation Power generation  
Location [11] CHILE Chile  
Percentage of ownership [11] 60.00% 60.00%  
Acquisition cost [11] ₩ 1,397 ₩ 1,397  
Book value [Abstract]      
Book value ₩ 913 [11] ₩ 659 [11] 0
Omisan Wind Power Co., Ltd.      
Disclosure of joint ventures [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 42.00% 42.00%  
Acquisition cost ₩ 10,752 ₩ 10,752  
Book value [Abstract]      
Book value ₩ 10,411 ₩ 10,633 0
Foresight Iberian Solar Group Holding, S.L      
Disclosure of joint ventures [line items]      
Key operation activities [11] Power generation Power generation  
Location [11] SPAIN Spain  
Percentage of ownership [11] 75.00% 75.00%  
Acquisition cost [11] ₩ 11,465 ₩ 9,697  
Book value [Abstract]      
Book value [11] ₩ 10,565 ₩ 9,743  
Yeongwol Eco Wind 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 ₩ 3,089 ₩ 3,089  
Book value [Abstract]      
Book value ₩ 3,155 ₩ 3,196 0
Gurae Resident 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 ₩ 386 ₩ 386  
Book value [Abstract]      
Book value ₩ 391 ₩ 395 0
Cheongju Eco Park 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 ₩ 5,858 ₩ 5,858  
Book value [Abstract]      
Book value ₩ 10,490 ₩ 5,465 0
Enel X Midland Photovoltaic, LLC      
Disclosure of joint ventures [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 20.00% 20.00%  
Acquisition cost ₩ 1,695 ₩ 1,695  
Book value [Abstract]      
Book value ₩ 1,856 ₩ 1,688 0
Geumsungsan 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 ₩ 6,531 ₩ 6,531  
Book value [Abstract]      
Book value ₩ 3,493 ₩ 6,053 0
KEPCO KPS Carabao Corp.      
Disclosure of joint ventures [line items]      
Key operation activities Utility plant maintenance [7] Utility plant maintenance  
Location PHILIPPINES [7] Philippines  
Percentage of ownership 40.00% [7] 40.00%  
Acquisition cost ₩ 93 [7] ₩ 93  
Book value [Abstract]      
Book value ₩ 177 [7] ₩ 386 0
Prime Swedish Holding AB      
Disclosure of joint ventures [line items]      
Key operation activities Holding company Holding company  
Location SWEDEN Sweden  
Percentage of ownership 45.00% 45.00%  
Acquisition cost ₩ 35,410 ₩ 14,514  
Book value [Abstract]      
Book value ₩ 36,245 ₩ 15,441 0
Goheung New Energy Co., Ltd.      
Disclosure of joint ventures [line items]      
Key operation activities Power generation Power generation  
Location KOREA Korea  
Percentage of ownership 46.15% 46.15%  
Acquisition cost ₩ 12,959 ₩ 12,959  
Book value [Abstract]      
Book value ₩ 11,832 ₩ 11,708 0
Gunsan Land Solar Co., Ltd.      
Disclosure of joint ventures [line items]      
Key operation activities [11] Power generation Power generation  
Location [11] KOREA Korea  
Percentage of ownership [11] 75.29% 75.29%  
Acquisition cost [11] ₩ 19,091 ₩ 19,091  
Book value [Abstract]      
Book value ₩ 27,544 [11] ₩ 19,317 [11] 0
Capman Lynx SCA, SICAR      
Disclosure of joint ventures [line items]      
Key operation activities Holding company Holding company  
Location LUXEMBOURG Luxembourg  
Percentage of ownership 50.00% 50.00%  
Acquisition cost ₩ 9,601 ₩ 9,601  
Book value [Abstract]      
Book value ₩ 0 ₩ 9,976 0
International Offshore Power Transmission Holding Company Limited      
Disclosure of joint ventures [line items]      
Key operation activities Undersea transmission network operation Undersea transmission network operation  
Location UAE UAE  
Percentage of ownership 35.00% 35.00%  
Acquisition cost ₩ 0 ₩ 0  
Book value [Abstract]      
Book value ₩ 0 0 ₩ 0
Pyeongchang Wind Power Co., Ltd      
Disclosure of joint ventures [line items]      
Key operation activities [16] Power generation    
Location [16] KOREA    
Percentage of ownership [16] 58.00%    
Acquisition cost [16] ₩ 9,329    
Book value [Abstract]      
Book value ₩ 14,464 [16] 0  
Eumseong Eco Park Co., Ltd      
Disclosure of joint ventures [line items]      
Key operation activities Power generation    
Location KOREA    
Percentage of ownership 29.00%    
Acquisition cost ₩ 5,741    
Book value [Abstract]      
Book value ₩ 5,557 0  
Songsan Green Energy Co., Ltd      
Disclosure of joint ventures [line items]      
Key operation activities [3] Fuel cell generation    
Location [3] KOREA    
Percentage of ownership [3] 25.00%    
Acquisition cost [3] ₩ 1,400    
Book value [Abstract]      
Book value ₩ 1,387 [3] 0  
Changwon Nu-ri Energy Co., Ltd      
Disclosure of joint ventures [line items]      
Key operation activities [3] Fuel cell generation    
Location [3] KOREA    
Percentage of ownership [3] 33.33%    
Acquisition cost [3] ₩ 500    
Book value [Abstract]      
Book value ₩ 497 [3] 0  
Hasami Wind Farm Corporation      
Disclosure of joint ventures [line items]      
Key operation activities Power generation    
Location KOREA    
Percentage of ownership 29.00%    
Acquisition cost ₩ 1,596    
Book value [Abstract]      
Book value ₩ 1,589 0  
PungBack Wind Farm Corporation      
Disclosure of joint ventures [line items]      
Key operation activities [17] Power generation    
Location [17] KOREA    
Percentage of ownership [17] 32.89%    
Acquisition cost [17] ₩ 7,885    
Book value [Abstract]      
Book value ₩ 6,743 [17] 0  
Trumbull Asset Management, LLC      
Disclosure of joint ventures [line items]      
Key operation activities [18] Holding company    
Location [18] USA    
Percentage of ownership [18] 78.00%    
Acquisition cost [18] ₩ 0    
Book value [Abstract]      
Book value ₩ 246 [18] 0  
S-Power Chile SpA      
Disclosure of joint ventures [line items]      
Key operation activities Power generation    
Location CHILE    
Percentage of ownership 50.00%    
Acquisition cost ₩ 127    
Book value [Abstract]      
Book value ₩ 127 0  
Seungmun Green Energy      
Disclosure of joint ventures [line items]      
Key operation activities Power generation    
Location KOREA    
Percentage of ownership 33.00%    
Acquisition cost ₩ 8,973    
Book value [Abstract]      
Book value ₩ 9,054 0  
Seobusambo highway photovoltaics Co., Ltd.      
Disclosure of joint ventures [line items]      
Key operation activities [19] Power generation    
Location [19] KOREA    
Percentage of ownership [19] 80.00%    
Acquisition cost [19] ₩ 3,020    
Book value [Abstract]      
Book value ₩ 3,066 [19] ₩ 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 and the Group can exercise same voting rights as other shareholders at the board of directors. Accordingly, the entities are classified as joint ventures.
[2] 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.
[3] The effective percentage of ownership is less than 50%. However, the entity is classified as a joint venture, because all consent was required to make decisions on related activities.
[4] The Company is planning to sell its investment in SPC Power Corporation, KEPCO SPC Power Corporation, KV Holdings, Inc. and time or proceeds of sales are not specified as of December 31, 2022.
[5] According to the shareholders’ agreement, the parties have joint control over all decisions related to finance and operation. Accordingly, the entity is classified as joint ventures.
[6] The effective percentage of ownership increased due to the disproportionate capital reduction of financial investors during the year ended December 31, 2022.
[7] The joint arrangement which the Group has joint control is structured through a separate company. The parties have joint control over the joint arrangement are classified as joint ventures, judging that they have rights to the net assets of the arrangement.
[8] The joint arrangement which the Company has joint control is structured through a separate company. The parties have joint control over the joint arrangement are classified as joint ventures, judging that they have rights to the net assets of the arrangement.
[9] The effective percentage of ownership is less than 20%. However, decisions in relevant actitvities must be agreed by ownership parties. Accordingly, the entity is classified as joint ventures.
[10] Although the nominal percentage of ownership is 29%, the effective percentage of ownership is 54.24%, considering the interest of financial investors as a liability component.
[11] The effective percentage of ownership is more than 50%. However, decisions in relevant actitvities must be agreed by all ownership parties. Accordingly, the entity is classified as a joint venture.
[12] The effective percentage of ownership is less than 20%. However, according to the shareholders’ agreement, decisions related pricipal operation must be agreed by all ownership parties. Accordingly, the Group can exercise significant influence.
[13] The effective percentage of ownership is less than 20%. However, according to the shareholders’ agreement, decisions related pricipal operation must be agreed by all ownership parties. Accordingly, the Company can exercise significant influence.
[14] According to the Dayone Energy Co., Ltd. Investment Agreement signed in March 2011, the Group has a commitment to guarantee principal and certain returns on shares of Dayone Energy Co., Ltd. held by NH Power 2nd Co., Ltd. and the National Agricultural Cooperative Federation. Since NH Power 2nd Co., Ltd. and the National Agricultural Cooperative Federation have put option regarding their share of the entity, the Group was deemed to have acquired an additional 15.64% stake. As a result, the effective percentage of ownership is 46.3% in the current and prior period. In accordance with shareholders’ agreement signed during the current period, the Group has joint control with other investors in making important financial and operation decisions, so it has been reclassified from an associate to a joint venture.
[15] According to the Dayone Energy Co., Ltd. Investment Agreement signed in March 2011, the Company has a commitment to guarantee principal and certain returns on shares of Dayone Energy Co., Ltd. held by NH Power 2nd Co., Ltd. and the National Agricultural Cooperative Federation. Since NH Power 2nd Co., Ltd. and the National Agricultural Cooperative Federation have put option regarding their share of the entity, the Company was deemed to have acquired an additional 15.64% stake. As a result, the effective percentage of ownership is 46.3% in the current and prior period. In accordance with shareholders’ agreement signed during the current period, the Company has joint control with other investors in making important financial and operation decisions, so it has been reclassified from an associate to a joint venture.
[16] After addtional acquisition of the shares, the effective percentage of ownership is more than 50%. However, decisions in relevant actitvities must be agreed by all members of the board of directors. Accordingly, the entity is classified as a joint venture.
[17] The effective percentage of ownership is 37%, considering potential common stock.
[18] The effective percentage of ownership is more than 50%. However, decisions in relevant actitvities must be agreed by all members of the board of directors. Accordingly, the entity is classified as a joint venture.
[19] Due to the changes in the agreement, the Group lost its control over the entity. Accordingly, the entity is reclassified to a joint venture from a subsidiary. Although the effective percentage of ownership is more than 50%, decisions in relevant actitvities must be agreed by all members of the board of directors.