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Investments in Associates 4 (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of associates [line items]      
Book value ₩ 5,844,464 ₩ 5,232,373 ₩ 4,250,787
Korea Gas Corporation      
Disclosure of associates [line items]      
Net assets ₩ 10,410,740 ₩ 9,119,335  
Effective percentage of ownership 20.47% 20.47%  
Share in net assets ₩ 2,131,078 ₩ 1,866,728  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (45,782) (51,215)  
Book value 2,085,296 1,815,513 [1] 1,647,325
Korea Electric Power Industrial Development Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 107,166 ₩ 84,885  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 31,078 ₩ 24,617  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 31,078 24,617 25,630
YTN Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 256,791 ₩ 241,863  
Effective percentage of ownership 21.43% 21.43%  
Share in net assets ₩ 55,027 ₩ 51,828  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 55,027 [2] 51,828 40,549
Gangwon Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 80,729 ₩ 70,032  
Effective percentage of ownership 15.00% 15.00%  
Share in net assets ₩ 12,109 ₩ 10,505  
Investment differential 49 49  
Intercompany transaction 0 0  
Others 0 0  
Book value 12,158 [3] 10,554 [4] 11,443
Hyundai Green Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 413,072 ₩ 420,533  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 119,791 ₩ 121,955  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 119,791 121,955 132,774
Korea Power Exchange      
Disclosure of associates [line items]      
Net assets ₩ 275,126 ₩ 269,728  
Effective percentage of ownership 100.00% 100.00%  
Share in net assets ₩ 275,126 ₩ 269,728  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 275,126 [5] 269,728 [6] 269,122
Taebaek Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 24,168 ₩ 27,199  
Effective percentage of ownership 60.00% 25.00%  
Share in net assets ₩ 14,501 ₩ 6,800  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 14,501 [7] 6,800 6,392
Taebaek Guinemi Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 15,327 ₩ 13,426  
Effective percentage of ownership 67.25% 25.00%  
Share in net assets ₩ 10,307 ₩ 3,357  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 2,742 0  
Book value 13,049 [7] 3,357 3,087
Pyeongchang Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets   ₩ 21,644  
Effective percentage of ownership   25.00%  
Share in net assets   ₩ 5,411  
Investment differential   0  
Intercompany transaction   0  
Others   0  
Book value 0 5,411 5,027
Daeryun Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 402,140 ₩ 281,005  
Effective percentage of ownership 6.85% 9.34%  
Share in net assets ₩ 27,547 ₩ 26,246  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (820) (820)  
Book value 26,727 [3] 25,426 [4] 26,353
Changjuk Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets   ₩ 27,849  
Effective percentage of ownership   30.00%  
Share in net assets   ₩ 8,355  
Investment differential   0  
Intercompany transaction   0  
Others   0  
Book value 0 8,355 7,867
KNH Solar Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 10,679 ₩ 8,436  
Effective percentage of ownership 27.00% 27.00%  
Share in net assets ₩ 2,883 ₩ 2,278  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 2,883 2,278 2,436
SPC Power Corporation      
Disclosure of associates [line items]      
Net assets ₩ 228,534 ₩ 223,523  
Effective percentage of ownership 38.00% 38.00%  
Share in net assets ₩ 86,843 ₩ 84,939  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (15,975) (19,893)  
Book value 70,868 [8] 65,046 69,912
Gemeng International Energy Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 2,335,997 ₩ 2,175,169  
Effective percentage of ownership 34.00% 34.00%  
Share in net assets ₩ 794,239 ₩ 739,557  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (215,418) (144,339)  
Book value 578,821 595,218 679,708
PT. Cirebon Electric Power      
Disclosure of associates [line items]      
Net assets ₩ 491,324 ₩ 443,525  
Effective percentage of ownership 27.50% 27.50%  
Share in net assets ₩ 135,114 ₩ 121,969  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 135,114 121,969 117,811
KNOC Nigerian East Oil Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ (83,483) ₩ (78,029)  
Effective percentage of ownership 14.63% 14.63%  
Share in net assets ₩ (12,214) ₩ (11,416)  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 12,214 11,416  
Book value 0 [9] 0 [10] 0
KNOC Nigerian West Oil Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ (76,755) ₩ (71,735)  
Effective percentage of ownership 14.63% 14.63%  
Share in net assets ₩ (11,229) ₩ (10,495)  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 11,229 10,495  
Book value 0 [9] 0 [10] 0
PT Wampu Electric Power      
Disclosure of associates [line items]      
Net assets ₩ 82,051 ₩ 76,255  
Effective percentage of ownership 46.00% 46.00%  
Share in net assets ₩ 37,743 ₩ 35,077  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 37,743 35,077 27,865
PT. Bayan Resources TBK      
Disclosure of associates [line items]      
Net assets ₩ 2,476,409 ₩ 2,141,022  
Effective percentage of ownership 20.00% 20.00%  
Share in net assets ₩ 495,282 ₩ 428,204  
Investment differential 265,817 309,464  
Intercompany transaction 0 0  
Others (76,380) (76,379)  
Book value 684,719 661,289 425,234
S-Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 290,656 ₩ 253,444  
Effective percentage of ownership 49.00% 49.00%  
Share in net assets ₩ 142,421 ₩ 124,188  
Investment differential 0 0  
Intercompany transaction (1,293) (1,402)  
Others 0 0  
Book value 141,128 122,786 110,292
Pioneer Gas Power Limited      
Disclosure of associates [line items]      
Net assets ₩ (205,787) ₩ (155,789)  
Effective percentage of ownership 38.50% 38.50%  
Share in net assets ₩ (79,223) ₩ (59,975)  
Investment differential 22,278 22,278  
Intercompany transaction 0 0  
Others 56,945 37,697  
Book value 0 0 0
Eurasia Energy Holdings      
Disclosure of associates [line items]      
Net assets ₩ (508) ₩ (476)  
Effective percentage of ownership 40.00% 40.00%  
Share in net assets ₩ (203) ₩ (190)  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 203 190  
Book value 0 0 0
Xe-Pian Xe-Namnoy Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 466,385 ₩ 373,976  
Effective percentage of ownership 25.00% 25.00%  
Share in net assets ₩ 116,596 ₩ 93,494  
Investment differential 305 305  
Intercompany transaction (1,028) (1,069)  
Others (289) (289)  
Book value 115,584 92,441 64,570
PT. Mutiara Jawa      
Disclosure of associates [line items]      
Net assets ₩ 12,402 ₩ 8,857  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 3,597 ₩ 2,569  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 3,597 2,569 1,780
Samcheok Eco Materials Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 23,343 ₩ 24,691  
Effective percentage of ownership 25.54% 25.54%  
Share in net assets ₩ 5,962 ₩ 6,306  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (5,962) (6,306)  
Book value 0 [11] 0 [11] 0
Noeul Green Energy Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ (18,861) ₩ 13,132  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ (5,470) ₩ 3,808  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 5,470 0  
Book value 0 3,808 4,197
Goseong Green Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 1,001,651 ₩ 902,746  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 290,479 ₩ 261,796  
Investment differential 0 0  
Intercompany transaction (1,586) (938)  
Others 0 0  
Book value 288,893 260,858 2,186
Gangneung Eco Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 7,464 ₩ 150,144  
Effective percentage of ownership 1.61% 1.61%  
Share in net assets ₩ 120 ₩ 2,419  
Investment differential 0 0  
Intercompany transaction (134) (131)  
Others 14 0  
Book value 0 [3] 2,288 [4] 2,368
Shin Pyeongtaek Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 363,838 ₩ 263,477  
Effective percentage of ownership 40.00% 40.00%  
Share in net assets ₩ 145,535 ₩ 105,391  
Investment differential 3,559 3,559  
Intercompany transaction (15,271) (15,876)  
Others 0 0  
Book value 133,823 93,074 69,591
Haeng Bok Do Si Photovoltaic Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 986 ₩ 790  
Effective percentage of ownership 28.00% 28.00%  
Share in net assets ₩ 276 ₩ 221  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 2 2  
Book value 278 223 210
Dongducheon Dream Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 302,071 ₩ 258,723  
Effective percentage of ownership 34.01% 34.01%  
Share in net assets ₩ 102,734 ₩ 87,992  
Investment differential 1,757 1,757  
Intercompany transaction (2,609) (2,969)  
Others (12,582) (12,582)  
Book value 89,300 [12] 74,198 [12] 80,637
Jinbhuvish Power Generation Pvt. Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 47,988 ₩ 49,931  
Effective percentage of ownership 5.16% 5.16%  
Share in net assets ₩ 2,496 ₩ 2,576  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (2,496) (2,576)  
Book value 0 [3] 0 [4] 0
Daejung Offshore Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 3,337 ₩ 3,657  
Effective percentage of ownership 46.59% 46.59%  
Share in net assets ₩ 1,555 ₩ 1,704  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 1,555 1,704 2,165
GS Donghae Electric Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 765,131 ₩ 716,977  
Effective percentage of ownership 34.00% 34.00%  
Share in net assets ₩ 260,145 ₩ 243,772  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 260,145 243,772 244,426
Daegu Photovoltaic Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 9,823 ₩ 8,076  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 2,849 ₩ 2,342  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 2,849 2,342 2,066
Busan Green Energy Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 15,156 ₩ 17,352  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 4,395 ₩ 5,032  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 4,395 5,032 8,778
Gunsan Bio Energy Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ (21,127) ₩ (20,478)  
Effective percentage of ownership 18.87% 18.87%  
Share in net assets ₩ (3,986) ₩ (3,864)  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 3,986 3,864  
Book value 0 [3] 0 [4] 0
Hansuwon KNP Co., Ltd. (formerly, Korea Nuclear Partners Co., Ltd.)      
Disclosure of associates [line items]      
Net assets ₩ 1,519 ₩ 1,309  
Effective percentage of ownership 28.98% 28.98%  
Share in net assets ₩ 440 ₩ 379  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (160) (160)  
Book value 280 219 200
Korea Electric Vehicle Charging Service      
Disclosure of associates [line items]      
Net assets   ₩ 7,144  
Effective percentage of ownership   17.50%  
Share in net assets   ₩ 1,250  
Investment differential   0  
Intercompany transaction   0  
Others   0  
Book value 0 1,250 [4] 576
Korea Electric Power Corporation Fund      
Disclosure of associates [line items]      
Net assets ₩ 29,400 ₩ 48,913  
Effective percentage of ownership 98.09% 98.09%  
Share in net assets ₩ 28,838 ₩ 47,979  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 4 4  
Book value 28,842 [13] 47,983 [14] 41,926
Energy Infra Asset Management Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 11,956 ₩ 10,770  
Effective percentage of ownership 9.90% 9.90%  
Share in net assets ₩ 1,184 ₩ 1,066  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 1,184 [3] 1,066 [4] 938
Daegu clean Energy Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 44 ₩ 44  
Effective percentage of ownership 28.00% 28.00%  
Share in net assets ₩ 12 ₩ 12  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 12 12 12
YaksuESS Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 1,670 ₩ 2,464  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 484 ₩ 715  
Investment differential 2 1  
Intercompany transaction 0 0  
Others 0 0  
Book value 486 716  
Nepal Water & Energy Development Company Private Limited      
Disclosure of associates [line items]      
Net assets ₩ 99,862 ₩ 94,639  
Effective percentage of ownership 69.06% 69.06%  
Share in net assets ₩ 68,968 ₩ 65,361  
Investment differential 972 972  
Intercompany transaction 0 0  
Others 0 0  
Book value 69,940 66,333  
Gwangyang Green Energy Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 125,130 ₩ 127,239  
Effective percentage of ownership 20.00% 20.00%  
Share in net assets ₩ 25,026 ₩ 25,448  
Investment differential 18 18  
Intercompany transaction 0 0  
Others 0 0  
Book value 25,044 25,466 926
PND Solar Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 4,306 ₩ 3,708  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 1,249 ₩ 1,075  
Investment differential 154 154  
Intercompany transaction 0 0  
Others 0 0  
Book value 1,403 1,229 1,149
Hyundai Eco Energy Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 39,033 ₩ 28,198  
Effective percentage of ownership 19.00% 19.00%  
Share in net assets ₩ 7,416 ₩ 5,358  
Investment differential 215 214  
Intercompany transaction 0 0  
Others 0 0  
Book value 7,631 [3] 5,572 [4] 4,250
YeongGwang Yaksu Wind Electric Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 788 ₩ (692)  
Effective percentage of ownership 9.63% 9.63%  
Share in net assets ₩ 76 ₩ (67)  
Investment differential 300 300  
Intercompany transaction 0 0  
Others (220) 0  
Book value 156 [3] 233 [4] 312
Green Energy Electricity Generation Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 2,733 ₩ 3,222  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 793 ₩ 934  
Investment differential 778 779  
Intercompany transaction 0 0  
Others 0 0  
Book value 1,571 1,713 25
Korea Energy Solutions Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 466 ₩ 614  
Effective percentage of ownership 20.00% 20.00%  
Share in net assets ₩ 93 ₩ 123  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 93 123 197
ITR Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ (26) ₩ 157  
Effective percentage of ownership 20.00% 20.00%  
Share in net assets ₩ (5) ₩ 31  
Investment differential 1 1  
Intercompany transaction 0 0  
Others 4 0  
Book value 0 32 40
Structure Test Network Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 1,565 ₩ 1,265  
Effective percentage of ownership 20.00% 20.00%  
Share in net assets ₩ 313 ₩ 253  
Investment differential 53 53  
Intercompany transaction 0 0  
Others 0 0  
Book value 366 306 27
Namjeongsusang Solar Power Operation Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 2,355 ₩ 2,272  
Effective percentage of ownership 15.00% 15.00%  
Share in net assets ₩ 353 ₩ 341  
Investment differential 20 20  
Intercompany transaction 0 0  
Others 0 0  
Book value 373 [15] 361 [16] 103
Indeck Niles Development, LLC      
Disclosure of associates [line items]      
Net assets ₩ 416,164 ₩ 322,479  
Effective percentage of ownership 50.00% 56.25%  
Share in net assets ₩ 208,082 ₩ 181,395  
Investment differential 93,956 64,878  
Intercompany transaction 0 0  
Others 0 0  
Book value 302,038 246,273 [17] 20,627
Indeck Niles Asset Management, LLC      
Disclosure of associates [line items]      
Net assets ₩ 283 ₩ 334  
Effective percentage of ownership 33.33% 33.33%  
Share in net assets ₩ 94 ₩ 111  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 94 111 101
Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1      
Disclosure of associates [line items]      
Net assets ₩ 14,146 ₩ 14,567  
Effective percentage of ownership 49.00% 49.00%  
Share in net assets ₩ 6,932 ₩ 7,138  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 6,932 7,138 7,326
Suwon New Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 1,978 ₩ 1,967  
Effective percentage of ownership 33.05% 39.90%  
Share in net assets ₩ 654 ₩ 785  
Investment differential 0 0  
Intercompany transaction 265 250  
Others 0 0  
Book value 919 1,035 1,054
KPGE Inc.      
Disclosure of associates [line items]      
Net assets   ₩ 1,066  
Effective percentage of ownership   29.00%  
Share in net assets   ₩ 309  
Investment differential   0  
Intercompany transaction   0  
Others   0  
Book value 0 309 287
Gwangbaek Solar Power Investment Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 10,949 ₩ 10,205  
Effective percentage of ownership 44.00% 44.00%  
Share in net assets ₩ 4,818 ₩ 4,490  
Investment differential 315 316  
Intercompany transaction 0 0  
Others 0 0  
Book value 5,133 4,806 4,682
Go deok Clean Energy Co., Ltd      
Disclosure of associates [line items]      
Net assets ₩ 11,049 ₩ 10,755  
Effective percentage of ownership 40.00% 40.00%  
Share in net assets ₩ 4,420 ₩ 4,302  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 4,420 4,302 960
SureDataLab Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 739 ₩ 533  
Effective percentage of ownership 23.95% 23.95%  
Share in net assets ₩ 177 ₩ 128  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 177 128 85
SEP Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ (65) ₩ 32  
Effective percentage of ownership 21.26% 21.26%  
Share in net assets ₩ (14) ₩ 7  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 14 0  
Book value 0 7 14
Hankook Electric Power Information Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 1,337 ₩ 636  
Effective percentage of ownership 16.49% 25.25%  
Share in net assets ₩ 220 ₩ 161  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 220 [18] 161 139
Tronix Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 526 ₩ 547  
Effective percentage of ownership 12.50% 20.00%  
Share in net assets ₩ 66 ₩ 109  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 66 [18] 109 119
O2&B Global Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 181 ₩ 177  
Effective percentage of ownership 20.00% 20.00%  
Share in net assets ₩ 36 ₩ 35  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 36 35 22
Muan Sunshine Solar Power Plant Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 10,338 ₩ 3,871  
Effective percentage of ownership 20.00% 20.00%  
Share in net assets ₩ 2,068 ₩ 774  
Investment differential 494 494  
Intercompany transaction 0 0  
Others 0 0  
Book value 2,562 1,268 1,096
Bigeum Resident Photovoltaic Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ (1,539) ₩ (999)  
Effective percentage of ownership 29.90% 29.90%  
Share in net assets ₩ (460) ₩ (299)  
Investment differential 24 24  
Intercompany transaction 0 0  
Others 436 275  
Book value 0 0 0
Goesan Solar Park Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 8,936 ₩ 6,644  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 2,591 ₩ 1,927  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 2,591 1,927 1,684
Saemangeum Heemang Photovoltaic Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 35,060 ₩ 27,140  
Effective percentage of ownership 35.00% 35.00%  
Share in net assets ₩ 12,271 ₩ 9,499  
Investment differential 739 739  
Intercompany transaction 0 0  
Others 0 0  
Book value 13,010 10,238 11,022
Bitgoel Eco Energy Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 18,249 ₩ 15,021  
Effective percentage of ownership 49.05% 29.00%  
Share in net assets ₩ 8,951 ₩ 4,356  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 8,951 4,356 29
Jeju Gimnyeong Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 2,907 ₩ 3,038  
Effective percentage of ownership 30.00% 30.00%  
Share in net assets ₩ 872 ₩ 911  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 872 911 1,578
Seoroseoro Sunny Power Plant Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 1,970 ₩ 1,647  
Effective percentage of ownership 42.58% 42.58%  
Share in net assets ₩ 839 ₩ 701  
Investment differential 20 20  
Intercompany transaction 0 0  
Others 0 0  
Book value 859 721 230
Muan Solar Park Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 37,565 ₩ 28,788  
Effective percentage of ownership 20.00% 20.00%  
Share in net assets ₩ 7,513 ₩ 5,758  
Investment differential 325 325  
Intercompany transaction 0 0  
Others 0 0  
Book value 7,838 6,083 4,180
YuDang Solar Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 2,929 ₩ 2,826  
Effective percentage of ownership 20.00% 20.00%  
Share in net assets ₩ 586 ₩ 565  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 586 565 360
Anjwa Smart Farm & Solar City Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 39,225 ₩ 29,838  
Effective percentage of ownership 20.00% 20.00%  
Share in net assets ₩ 7,845 ₩ 5,968  
Investment differential 817 816  
Intercompany transaction 0 0  
Others 0 0  
Book value 8,662 6,784 5,510
Daewon Green Energy Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 17,514 ₩ 15,118  
Effective percentage of ownership 25.36% 25.36%  
Share in net assets ₩ 4,441 ₩ 3,833  
Investment differential 44 44  
Intercompany transaction 0 0  
Others 0 0  
Book value 4,485 3,877 3,910
G.GURU Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 1,216 ₩ 1,636  
Effective percentage of ownership 24.65% 24.65%  
Share in net assets ₩ 300 ₩ 403  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 300 403 0
UD4M Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 1,125 ₩ 1,154  
Effective percentage of ownership 14.29% 12.50%  
Share in net assets ₩ 161 ₩ 144  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 161 144 0
Dongbu Highway Solar Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 1,509 ₩ 1,073  
Effective percentage of ownership 20.00% 20.00%  
Share in net assets ₩ 302 ₩ 215  
Investment differential 50 50  
Intercompany transaction 0 0  
Others 0 0  
Book value 352 265  
Seobu Highway Solar Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 1,581 ₩ 1,444  
Effective percentage of ownership 20.00% 20.00%  
Share in net assets ₩ 316 ₩ 289  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 316 289  
Korea Energy Data Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 211 ₩ 211  
Effective percentage of ownership 29.37% 29.37%  
Share in net assets ₩ 62 ₩ 62  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 62 62 0
Gangneung Sacheon Fuel Cell Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 10,218 ₩ 2,755  
Effective percentage of ownership 41.00% 65.00%  
Share in net assets ₩ 4,189 ₩ 1,791  
Investment differential 88 87  
Intercompany transaction 0 0  
Others 0 0  
Book value 4,277 1,878 0
Kosture Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 156 ₩ 124  
Effective percentage of ownership 0.82% 0.26%  
Share in net assets ₩ 1 ₩ 0  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 1 0 0
Digital Innovation Growth Fund      
Disclosure of associates [line items]      
Net assets   ₩ 12,857  
Effective percentage of ownership   76.92%  
Share in net assets   ₩ 9,890  
Investment differential   0  
Intercompany transaction   0  
Others   0  
Book value 0 9,890 [14] 0
Taebaek Gadeoksan Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 58,940 ₩ 41,602  
Effective percentage of ownership 34.00% 39.65%  
Share in net assets ₩ 20,040 ₩ 16,495  
Investment differential 0 0  
Intercompany transaction 0 0  
Others 0 0  
Book value 20,040 16,495 [19] 0
Chuncheon Green Energy Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 20,226 ₩ 4,881  
Effective percentage of ownership 45.00% 68.00%  
Share in net assets ₩ 9,102 ₩ 3,319  
Investment differential 53 53  
Intercompany transaction 0 0  
Others 0 0  
Book value 9,155 3,372 [14] 0
Yeomsubong Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 1,540 ₩ 4  
Effective percentage of ownership 3.81% 48.72%  
Share in net assets ₩ 59 ₩ 2  
Investment differential 3 93  
Intercompany transaction 0 0  
Others 0 0  
Book value 62 [20] 95 0
Yeongyang Wind Power Corporation II      
Disclosure of associates [line items]      
Net assets ₩ 17,837 ₩ 19,516  
Effective percentage of ownership 30.00% 30.00%  
Share in net assets ₩ 5,351 ₩ 5,855  
Investment differential 2,110 2,110  
Intercompany transaction 0 0  
Others 0 0  
Book value 7,461 7,965 0
Haeparang Energy Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 8,673 ₩ 8,885  
Effective percentage of ownership 25.00% 25.00%  
Share in net assets ₩ 2,168 ₩ 2,221  
Investment differential 20 20  
Intercompany transaction 0 0  
Others 0 0  
Book value 2,188 2,241 0
Saemangeum Sebit Power Plant Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 36,439 ₩ 8,296  
Effective percentage of ownership 63.09% 69.55%  
Share in net assets ₩ 22,990 ₩ 5,770  
Investment differential 209 230  
Intercompany transaction 0 0  
Others 0 0  
Book value 23,199 [21] 6,000 [14] ₩ 0
Boulder Solar III, LLC      
Disclosure of associates [line items]      
Net assets ₩ 1,896    
Effective percentage of ownership 30.00%    
Share in net assets ₩ 569    
Investment differential 175    
Intercompany transaction 0    
Others 0    
Book value 744    
PlatformN. Co., Ltd [Member]      
Disclosure of associates [line items]      
Net assets ₩ 285    
Effective percentage of ownership 29.58%    
Share in net assets ₩ 84    
Investment differential 0    
Intercompany transaction 0    
Others 0    
Book value 84 0  
PT. Cirebon Energi Prasarana      
Disclosure of associates [line items]      
Net assets ₩ 690,347    
Effective percentage of ownership 10.00%    
Share in net assets ₩ 69,035    
Investment differential 0    
Intercompany transaction 0    
Others 0    
Book value 69,035 [15] 0  
Green Radiation Co., Ltd      
Disclosure of associates [line items]      
Net assets ₩ 77    
Effective percentage of ownership 10.00%    
Share in net assets ₩ 8    
Investment differential 3    
Intercompany transaction 0    
Others 0    
Book value [18] 11    
Future Convergence Technology Laboratory. Co., Ltd      
Disclosure of associates [line items]      
Net assets ₩ 249    
Effective percentage of ownership 20.12%    
Share in net assets ₩ 50    
Investment differential 0    
Intercompany transaction 0    
Others 0    
Book value 50    
SC E&G. Co,. Ltd      
Disclosure of associates [line items]      
Net assets ₩ 1,068    
Effective percentage of ownership 20.00%    
Share in net assets ₩ 214    
Investment differential 0    
Intercompany transaction 0    
Others 0    
Book value 214 0  
Wang San Engineering. Co,. Ltd      
Disclosure of associates [line items]      
Net assets ₩ 828    
Effective percentage of ownership 20.00%    
Share in net assets ₩ 166    
Investment differential 0    
Intercompany transaction 0    
Others 0    
Book value 166 0  
ACE      
Disclosure of associates [line items]      
Net assets ₩ 100    
Effective percentage of ownership 20.00%    
Share in net assets ₩ 20    
Investment differential 0    
Intercompany transaction 0    
Others 0    
Book value 20 0  
Environment and Energy Co., Ltd      
Disclosure of associates [line items]      
Net assets ₩ 93    
Effective percentage of ownership 10.54%    
Share in net assets ₩ 10    
Investment differential 0    
Intercompany transaction 0    
Others 0    
Book value 10 [18] 0  
Santiago Solar Power SpA      
Disclosure of associates [line items]      
Net assets ₩ 26,748    
Effective percentage of ownership 50.00%    
Share in net assets ₩ 13,373    
Investment differential 0    
Intercompany transaction 0    
Others 0    
Book value 13,373 ₩ 0  
Yanggu Floating Photovoltaic Power Plant Inc      
Disclosure of associates [line items]      
Net assets ₩ 3,115    
Effective percentage of ownership 29.00%    
Share in net assets ₩ 903    
Investment differential 0    
Intercompany transaction 0    
Others 0    
Book value ₩ 903    
[1] Due to changes in equity, the nominal and effective percentage of ownership are 20.47%.
[2] The Company is planning to sell its investments in YTN Co., Ltd. based on the resolution of the Board of Directors on November 23, 2022, but investments in YTN Co., Ltd. are not classified as assets held-for-sale as the Company hasn’t started the active selling procedures as of December 31, 2022.
[3] The effective percentage of ownership is less than 20%. However, the Group can exercise significant influence by virtue of its contractual right to appoint directors to the board of directors of the entity, and by strict decision criteria of the Group’s financial and operating policy of the board of directors.
[4] The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint directors to the board of directors of the entity, and by strict decision criteria of the Company’s financial and operating policy of the board of directors.
[5] The effective percentage of ownership is 100%. However, the Government regulates the Group’s ability to make operating and financial decisions over the entity, as the Government requires maintaining arms-length transactions between KPX and the Group’s other subsidiaries. Accordingly, the entity is not classified as a consolidated subsidiary. The Group can exercise significant influence by virtue of right to nominate directors to the board of directors of the entity.
[6] The effective percentage of ownership is 100%. However, the Government regulates the Company’s ability to make operating and financial decisions over the entity, as the Government requires maintaining arms-length transactions between KPX and the Company’s other subsidiaries. Accordingly, the entity is not classified as a consolidated subsidiary. The Company can exercise significant influence by virtue of right to nominate directors to the board of directors of the entity.
[7] After addtional acquisition of the shares, the effective percentage of ownership is more than 50%. However, the Group does not hold control over relevant business while it exercises significant influence by participating in the board of directors by the shareholders’ agreement. Accordingly, the entity is classified as an associate.
[8] 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.
[9] The effective percentage of ownership is less than 20%. However, the Group can exercise significant influence by virtue of its contractual right to appoint one out of four members of the steering committee of the entity. Moreover, the Group has significant financial transactions, which can affect its significant influence on the entity.
[10] The effective percentage of ownership is less than 20%. However, the Company can exercise significant influence by virtue of its contractual right to appoint one out of four members of the steering committee of the entity. Moreover, the Company has significant financial transactions, which can affect its significant influence on the entity.
[11] Although the nominal percentage of ownership is 2.35%, the effective percentage of ownership is 25.54%, considering redeemable convertible preferred stock as a liability component.
[12] The effective percentage of ownership is 34.01% considering the conversion of redeemable convertible preferred stock into ordinary stock.
[13] The effective percentage of ownership is more than 50% but the Group does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. Accordingly, the entity is classified as an associate.
[14] The effective percentage of ownership is more than 50% but the Company does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. Accordingly, the entity is classified as an associate.
[15] The effective percentage of ownership is less than 20%. However, the entity is classified as an associate because the Group excercises significant influence over the decisions related to finance and operation.
[16] The effective percentage of ownership is less than 20%. However, the Company considers the major decision-making body to be the general decision of the board of directors, and the general decision of the board of directors can be passed only by two directors of Namjeongsusang Solar Power Operation Co., Ltd. Accordingly, the entity is classified as an associate.
[17] According to the shareholders’ agreement, additional investment of 50% of total stake is agreed by March 2022.
[18] The effective percentage of ownership is less than 20%. However, the entity is classified as an associate because the Group excercises significant influence over the entity.
[19] The percentage of ownership decreased due to the unequal capital increase. The entity was reclassified from a joint venture to an associate, due to the changes in voting rights.
[20] The effective percentage of ownership decreased due to the disproportionate paid-in capital increase, and the effective percentage of ownership is less than 20%. However, the Group excercises significant influence over all decisions related to finance and operation.
[21] The effective percentage of ownership decreased due to the disproportionate paid-in capital increase during the year ended December 31, 2022. The effective percentage of ownership is more than 50% but the Group does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. Accordingly, the entity is classified as an associate.