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Investments in Associates 4 (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of associates [line items]      
Book value ₩ 5,232,373 ₩ 4,250,787 ₩ 4,251,802
Korea Gas Corporation      
Disclosure of associates [line items]      
Net assets ₩ 9,119,335 ₩ 7,735,156  
Effective percentage of ownership 20.47% 22.02%  
Share in net assets ₩ 1,866,728 ₩ 1,703,281  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) (51,215) (55,956)  
Book value 1,815,513 1,647,325 [1] 1,693,967
Korea Electric Power Industrial Development Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 84,885 ₩ 88,379  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 24,617 ₩ 25,630  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 24,617 25,630 25,393
YTN Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 241,863 ₩ 189,228  
Effective percentage of ownership 21.43% 21.43%  
Share in net assets ₩ 51,828 ₩ 40,549  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 51,828 40,549 39,747
Gangwon Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 70,032 ₩ 75,961  
Effective percentage of ownership 15.00% 15.00%  
Share in net assets ₩ 10,505 ₩ 11,394  
Investment differential 49 49  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 10,554 11,443 12,327
Hyundai Green Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 420,533 ₩ 457,842  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 121,955 ₩ 132,774  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 121,955 132,774 124,253
Korea Power Exchange      
Disclosure of associates [line items]      
Net assets ₩ 269,728 ₩ 269,122  
Effective percentage of ownership 100.00% 100.00%  
Share in net assets ₩ 269,728 ₩ 269,122  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 269,728 269,122 258,899
Taebaek Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 27,199 ₩ 25,568  
Effective percentage of ownership 25.00% 25.00%  
Share in net assets ₩ 6,800 ₩ 6,392  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 6,800 6,392 7,039
Taeback Guinemi Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 13,426 ₩ 12,349  
Effective percentage of ownership 25.00% 25.00%  
Share in net assets ₩ 3,357 ₩ 3,087  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 3,357 3,087 2,553
Pyeongchang Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 21,644 ₩ 20,107  
Effective percentage of ownership 25.00% 25.00%  
Share in net assets ₩ 5,411 ₩ 5,027  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 5,411 5,027 5,877
Daeryun Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 281,005 ₩ 290,931  
Effective percentage of ownership 9.34% 9.34%  
Share in net assets ₩ 26,246 ₩ 27,173  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) (820) (820)  
Book value 25,426 26,353 26,247
Changjuk Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 27,849 ₩ 26,223  
Effective percentage of ownership 30.00% 30.00%  
Share in net assets ₩ 8,355 ₩ 7,867  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 8,355 7,867 8,520
KNH Solar Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 8,436 ₩ 9,021  
Effective percentage of ownership 27.00% 27.00%  
Share in net assets ₩ 2,278 ₩ 2,436  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 2,278 2,436 2,382
SPC Power Corporation      
Disclosure of associates [line items]      
Net assets ₩ 223,523 ₩ 237,757  
Effective percentage of ownership 38.00% 38.00%  
Share in net assets ₩ 84,939 ₩ 90,348  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) (19,893) (20,436)  
Book value 65,046 69,912 63,583
Gemeng International Energy Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 2,175,169 ₩ 1,999,144  
Effective percentage of ownership 34.00% 34.00%  
Share in net assets ₩ 739,557 ₩ 679,709  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) (144,339) (1)  
Book value 595,218 679,708 670,896
PT. Cirebon Electric Power      
Disclosure of associates [line items]      
Net assets ₩ 443,525 ₩ 428,405  
Effective percentage of ownership 27.50% 27.50%  
Share in net assets ₩ 121,969 ₩ 117,811  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 121,969 117,811 123,425
KNOC Nigerian East Oil Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ (78,029) ₩ (71,521)  
Effective percentage of ownership 14.63% 14.63%  
Share in net assets ₩ (11,416) ₩ (10,464)  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 11,416 10,464  
Book value 0 0 0
KNOC Nigerian West Oil Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ (71,735) ₩ (65,740)  
Effective percentage of ownership 14.63% 14.63%  
Share in net assets ₩ (10,495) ₩ (9,618)  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 10,495 9,618  
Book value 0 0 0
PT Wampu Electric Power      
Disclosure of associates [line items]      
Net assets ₩ 76,255 ₩ 60,577  
Effective percentage of ownership 46.00% 46.00%  
Share in net assets ₩ 35,077 ₩ 27,865  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 35,077 27,865 29,355
PT. Bayan Resources TBK      
Disclosure of associates [line items]      
Net assets ₩ 2,141,022 ₩ 749,744  
Effective percentage of ownership 20.00% 20.00%  
Share in net assets ₩ 428,204 ₩ 149,949  
Investment differential 309,464 351,662  
Intercompany transaction 0 0  
Others (consolidated FS) (76,379) (76,377)  
Book value 661,289 425,234 445,141
S-Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 253,444 ₩ 228,168  
Effective percentage of ownership 49.00% 49.00%  
Share in net assets ₩ 124,188 ₩ 111,802  
Investment differential 0 0  
Intercompany transaction (1,402) (1,510)  
Others (consolidated FS) 0 0  
Book value 122,786 110,292 115,784
Pioneer Gas Power Limited      
Disclosure of associates [line items]      
Net assets ₩ (155,789) ₩ (99,446)  
Effective percentage of ownership 38.50% 38.50%  
Share in net assets ₩ (59,975) ₩ (38,284)  
Investment differential 22,278 22,278  
Intercompany transaction 0 0  
Others (consolidated FS) 37,697 16,006  
Book value 0 0 0
Eurasia Energy Holdings      
Disclosure of associates [line items]      
Net assets ₩ (476) ₩ (437)  
Effective percentage of ownership 40.00% 40.00%  
Share in net assets ₩ (190) ₩ (175)  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 190 175  
Book value 0 0 0
Xe-Pian Xe-Namnoy Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 373,976 ₩ 262,658  
Effective percentage of ownership 25.00% 25.00%  
Share in net assets ₩ 93,494 ₩ 65,665  
Investment differential 305 305  
Intercompany transaction (1,069) (1,110)  
Others (consolidated FS) (289) (290)  
Book value 92,441 64,570 72,935
Hadong Mineral Fiber Co., Ltd.      
Disclosure of associates [line items]      
Net assets   ₩ (28)  
Effective percentage of ownership   8.33%  
Share in net assets   ₩ (2)  
Investment differential   0  
Intercompany transaction   0  
Others (consolidated FS)   2  
Book value 0 0 0
PT. Mutiara Jawa      
Disclosure of associates [line items]      
Net assets ₩ 8,857 ₩ 6,138  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 2,569 ₩ 1,780  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 2,569 1,780 1,438
Samcheok Eco Materials Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 24,691 ₩ 23,426  
Effective percentage of ownership 25.54% 25.54%  
Share in net assets ₩ 6,306 ₩ 5,983  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) (6,306) (5,983)  
Book value 0 0 0
Noeul Green Energy Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 13,132 ₩ 14,472  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 3,808 ₩ 4,197  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 3,808 4,197 6,610
Goseong Green Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 902,746 ₩ 208,361  
Effective percentage of ownership 29.00% 1.12%  
Share in net assets ₩ 261,796 ₩ 2,324  
Investment differential 0 0  
Intercompany transaction (938) (138)  
Others (consolidated FS) 0 0  
Book value 260,858 2,186 2,340
Gangneung Eco Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 150,144 ₩ 154,904  
Effective percentage of ownership 1.61% 1.61%  
Share in net assets ₩ 2,419 ₩ 2,496  
Investment differential 0 0  
Intercompany transaction (131) (128)  
Others (consolidated FS) 0 0  
Book value 2,288 2,368 2,430
Shin Pyeongtaek Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 263,477 ₩ 206,281  
Effective percentage of ownership 40.00% 40.00%  
Share in net assets ₩ 105,391 ₩ 82,512  
Investment differential 3,559 3,559  
Intercompany transaction (15,876) (16,480)  
Others (consolidated FS) 0 0  
Book value 93,074 69,591 66,956
Haeng Bok Do Si Photovoltaic Power Co Ltd      
Disclosure of associates [line items]      
Net assets ₩ 790 ₩ 743  
Effective percentage of ownership 28.00% 28.00%  
Share in net assets ₩ 221 ₩ 208  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 2 2  
Book value 223 210 215
Dongducheon Dream Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 258,723 ₩ 278,714  
Effective percentage of ownership 34.01% 34.01%  
Share in net assets ₩ 87,992 ₩ 94,791  
Investment differential 1,757 1,757  
Intercompany transaction (2,969) (3,329)  
Others (consolidated FS) (12,582) (12,582)  
Book value 74,198 80,637 76,547
Jinbhuvish Power Generation Pvt. Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 49,931 ₩ 46,577  
Effective percentage of ownership 5.16% 5.16%  
Share in net assets ₩ 2,576 ₩ 2,403  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) (2,576) (2,403)  
Book value 0 0 0
Daejung Offshore Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 3,657 ₩ 4,647  
Effective percentage of ownership 46.59% 46.59%  
Share in net assets ₩ 1,704 ₩ 2,165  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 1,704 2,165 2,361
GS Donghae Electric Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 716,977 ₩ 718,900  
Effective percentage of ownership 34.00% 34.00%  
Share in net assets ₩ 243,772 ₩ 244,426  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 243,772 244,426 255,983
Daegu Photovoltaic Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 8,076 ₩ 7,125  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 2,342 ₩ 2,066  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 2,342 2,066 2,060
Busan Green Energy Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 17,352 ₩ 30,266  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 5,032 ₩ 8,777  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 1  
Book value 5,032 8,778 10,637
Gunsan Bio Energy Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ (20,478) ₩ (18,982)  
Effective percentage of ownership 18.87% 18.87%  
Share in net assets ₩ (3,864) ₩ (3,582)  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 3,864 3,582  
Book value 0 0 0
Korea Electric Vehicle Charging Service      
Disclosure of associates [line items]      
Net assets ₩ 7,144 ₩ 2,057  
Effective percentage of ownership 17.50% 28.00%  
Share in net assets ₩ 1,250 ₩ 576  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 1,250 576 1,063
Korea Nuclear Partners Co., Ltd.      
Disclosure of associates [line items]      
Net assets   ₩ 1,245  
Effective percentage of ownership   28.98%  
Share in net assets   ₩ 361  
Investment differential   0  
Intercompany transaction   0  
Others (consolidated FS)   (161)  
Book value   200 0
Korea Electric Power Corporation Fund      
Disclosure of associates [line items]      
Net assets ₩ 48,913 ₩ 42,739  
Effective percentage of ownership 98.09% 98.09%  
Share in net assets ₩ 47,979 ₩ 41,923  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 4 3  
Book value 47,983 41,926 41,126
Energy Infra Asset Management Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 10,770 ₩ 9,478  
Effective percentage of ownership 9.90% 9.90%  
Share in net assets ₩ 1,066 ₩ 938  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 1,066 938 791
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 (consolidated FS) 0 0  
Book value 12 12 13
Yaksu ESS Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 2,464 ₩ 1,562  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 715 ₩ 453  
Investment differential 1 1  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 716 454 516
Nepal Water & Energy Development Company Private Ltd      
Disclosure of associates [line items]      
Net assets ₩ 94,639 ₩ 68,228  
Effective percentage of ownership 69.06% 58.59%  
Share in net assets ₩ 65,361 ₩ 39,975  
Investment differential 972 971  
Intercompany transaction 0 0  
Others (consolidated FS) 0 1,731  
Book value 66,333 42,677  
Gwangyang Green Energy Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 127,239 ₩ 4,539  
Effective percentage of ownership 20.00% 20.00%  
Share in net assets ₩ 25,448 ₩ 908  
Investment differential 18 18  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 25,466 926 948
PND Solar Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 3,708 ₩ 3,431  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 1,075 ₩ 995  
Investment differential 154 154  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 1,229 1,149 1,144
Hyundai Ecoenergy Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 28,198 ₩ 21,240  
Effective percentage of ownership 19.00% 19.00%  
Share in net assets ₩ 5,358 ₩ 4,036  
Investment differential 214 214  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 5,572 4,250 3,781
YeongGwang Yaksu Wind Electric Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ (692) ₩ 124  
Effective percentage of ownership 9.63% 9.63%  
Share in net assets ₩ (67) ₩ 12  
Investment differential 300 300  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 233 312 386
Green Energy Electricity Generation Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 3,222 ₩ (2,599)  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 934 ₩ (754)  
Investment differential 779 779  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 1,713 25 163
Korea Energy Solution Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 614 ₩ 984  
Effective percentage of ownership 20.00% 20.00%  
Share in net assets ₩ 123 ₩ 197  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 123 197 259
ITR Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 157 ₩ 198  
Effective percentage of ownership 20.00% 20.00%  
Share in net assets ₩ 31 ₩ 40  
Investment differential 1 1  
Intercompany transaction 0 0  
Others (consolidated FS) 0 (1)  
Book value 32 40 33
Structure Test Network Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 1,265 ₩ (133)  
Effective percentage of ownership 20.00% 20.00%  
Share in net assets ₩ 253 ₩ (27)  
Investment differential 53 54  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 306 27 21
Namjeongsusang Solar Power Operation Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 2,272 ₩ 553  
Effective percentage of ownership 15.00% 15.00%  
Share in net assets ₩ 341 ₩ 83  
Investment differential 20 20  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 361 103 812
Indeck Niles Development, LLC      
Disclosure of associates [line items]      
Net assets ₩ 322,479 ₩ 33,298  
Effective percentage of ownership 56.25% 24.08%  
Share in net assets ₩ 181,395 ₩ 8,017  
Investment differential 64,878 12,610  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 246,273 [2] 20,627 0
Indeck Niles Asset Management, LLC      
Disclosure of associates [line items]      
Net assets ₩ 334 ₩ 303  
Effective percentage of ownership 33.33% 33.33%  
Share in net assets ₩ 111 ₩ 101  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 111 101 87
Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1      
Disclosure of associates [line items]      
Net assets ₩ 14,567 ₩ 14,951  
Effective percentage of ownership 49.00% 49.00%  
Share in net assets ₩ 7,138 ₩ 7,326  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 7,138 7,326 7,126
Suwon New Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 1,967 ₩ 1,966  
Effective percentage of ownership 39.90% 33.11%  
Share in net assets ₩ 785 ₩ 651  
Investment differential 0 0  
Intercompany transaction 250 267  
Others (consolidated FS) 0 136  
Book value 1,035 1,054 798
KPGE Inc.      
Disclosure of associates [line items]      
Net assets ₩ 1,066 ₩ 989  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 309 ₩ 287  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 309 287 287
Gwangbaek Solar Power Investment Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 10,205 ₩ 9,925  
Effective percentage of ownership 44.00% 44.00%  
Share in net assets ₩ 4,490 ₩ 4,367  
Investment differential 316 315  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 4,806 4,682 2,054
Go deok Clean Energy Co., Ltd      
Disclosure of associates [line items]      
Net assets ₩ 10,755 ₩ 1,574  
Effective percentage of ownership 40.00% 61.00%  
Share in net assets ₩ 4,302 ₩ 960  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 4,302 960 1,830
SureDataLab Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 533 ₩ 353  
Effective percentage of ownership 23.95% 23.95%  
Share in net assets ₩ 128 ₩ 85  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 128 85 0
SEP Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 32 ₩ 64  
Effective percentage of ownership 21.26% 21.26%  
Share in net assets ₩ 7 ₩ 14  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 7 14 0
Hankook Electric Power Information Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 636 ₩ 550  
Effective percentage of ownership 25.25% 25.25%  
Share in net assets ₩ 161 ₩ 139  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 161 139 0
Tronix Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 547 ₩ 593  
Effective percentage of ownership 20.00% 20.00%  
Share in net assets ₩ 109 ₩ 119  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 109 119 0
O2&B Global Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 177 ₩ 108  
Effective percentage of ownership 20.00% 20.00%  
Share in net assets ₩ 35 ₩ 22  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 35 22 0
Muan Sunshine Solar Power Plant Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 3,871 ₩ 3,010  
Effective percentage of ownership 20.00% 20.00%  
Share in net assets ₩ 774 ₩ 602  
Investment differential 494 494  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 1,268 1,096 0
Bigeum Resident Photovoltaic Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ (999) ₩ (387)  
Effective percentage of ownership 29.90% 29.90%  
Share in net assets ₩ (299) ₩ (116)  
Investment differential 24 0  
Intercompany transaction 0 0  
Others (consolidated FS) 275 116  
Book value 0 0 0
Jeju SolarOne Co., Ltd.      
Disclosure of associates [line items]      
Net assets   ₩ 1,594  
Effective percentage of ownership   10.00%  
Share in net assets   ₩ 159  
Investment differential   0  
Intercompany transaction   0  
Others (consolidated FS)   0  
Book value 0 159 0
Goesan Solar Park Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 6,644 ₩ 5,808  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 1,927 ₩ 1,684  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 1,927 1,684 0
Saemangeum Heemang Photovoltaic Co.,Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 27,140 ₩ 29,377  
Effective percentage of ownership 35.00% 35.00%  
Share in net assets ₩ 9,499 ₩ 10,282  
Investment differential 739 740  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 10,238 11,022 0
Bitgoel Eco Energy Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 15,021 ₩ 100  
Effective percentage of ownership 29.00% 29.00%  
Share in net assets ₩ 4,356 ₩ 29  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 4,356 29 0
Jeju Gimnyeong Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 3,038 ₩ 5,260  
Effective percentage of ownership 30.00% 30.00%  
Share in net assets ₩ 911 ₩ 1,578  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 911 1,578 0
Seoroseoro Sunny Power Plant Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 1,647 ₩ 1,182  
Effective percentage of ownership 42.58% 19.46%  
Share in net assets ₩ 701 ₩ 230  
Investment differential 20 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 721 230 0
Muan Solar Park Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 28,788 ₩ 20,374  
Effective percentage of ownership 20.00% 19.00%  
Share in net assets ₩ 5,758 ₩ 3,871  
Investment differential 325 309  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 6,083 4,180 0
YuDang Solar Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 2,826 ₩ 2,484  
Effective percentage of ownership 20.00% 20.00%  
Share in net assets ₩ 565 ₩ 497  
Investment differential 0 0  
Intercompany transaction 0 0  
Others (consolidated FS) 0 (137)  
Book value 565 360 0
Anjwa Smart Farm & Solar City Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 29,838 ₩ 24,174  
Effective percentage of ownership 20.00% 19.50%  
Share in net assets ₩ 5,968 ₩ 4,714  
Investment differential 816 796  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 6,784 5,510 0
Daewon Green Energy Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 15,118 ₩ 15,248  
Effective percentage of ownership 25.36% 25.36%  
Share in net assets ₩ 3,833 ₩ 3,866  
Investment differential 44 44  
Intercompany transaction 0 0  
Others (consolidated FS) 0 0  
Book value 3,877 3,910 ₩ 0
Hansuwon KNP Co., Ltd. (formerly, Korea Nuclear Partners Co., Ltd.)      
Disclosure of associates [line items]      
Net assets ₩ 1,309    
Effective percentage of ownership 28.98%    
Share in net assets ₩ 379    
Investment differential 0    
Intercompany transaction 0    
Others (consolidated FS) (160)    
Book value 219 200  
G.GURU Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 1,636    
Effective percentage of ownership 24.65%    
Share in net assets ₩ 403    
Investment differential 0    
Intercompany transaction 0    
Others (consolidated FS) 0    
Book value 403 0  
UD4M Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 1,154    
Effective percentage of ownership 12.50%    
Share in net assets ₩ 144    
Investment differential 0    
Intercompany transaction 0    
Others (consolidated FS) 0    
Book value 144 0  
Dongbu Highway Solar Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 1,073    
Effective percentage of ownership 20.00%    
Share in net assets ₩ 215    
Investment differential 50    
Intercompany transaction 0    
Others (consolidated FS) 0    
Book value 265    
Seobu Highway Solar Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 1,444    
Effective percentage of ownership 20.00%    
Share in net assets ₩ 289    
Investment differential 0    
Intercompany transaction 0    
Others (consolidated FS) 0    
Book value 289    
Korea Energy Data Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 211    
Effective percentage of ownership 29.37%    
Share in net assets ₩ 62    
Investment differential 0    
Intercompany transaction 0    
Others (consolidated FS) 0    
Book value 62 0  
Gangneung Sacheon Fuel Cell Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 2,755    
Effective percentage of ownership 65.00%    
Share in net assets ₩ 1,791    
Investment differential 87    
Intercompany transaction 0    
Others (consolidated FS) 0    
Book value 1,878 0  
Kosture Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 124    
Effective percentage of ownership 0.26%    
Share in net assets ₩ 0    
Investment differential 0    
Intercompany transaction 0    
Others (consolidated FS) 0    
Book value 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 (consolidated FS) 0    
Book value 9,890 [3] 0  
Taebaek Gadeoksan Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 41,602    
Effective percentage of ownership 39.65%    
Share in net assets ₩ 16,495    
Investment differential 0    
Intercompany transaction 0    
Others (consolidated FS) 0    
Book value 16,495 0  
Chuncheon Green Energy Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 4,881    
Effective percentage of ownership 68.00%    
Share in net assets ₩ 3,319    
Investment differential 53    
Intercompany transaction 0    
Others (consolidated FS) 0    
Book value 3,372 [4] 0  
Yeomsubong Wind Power Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 4    
Effective percentage of ownership 48.72%    
Share in net assets ₩ 2    
Investment differential 93    
Intercompany transaction 0    
Others (consolidated FS) 0    
Book value 95 0  
Yeongyang Wind Power Corporation II      
Disclosure of associates [line items]      
Net assets ₩ 19,516    
Effective percentage of ownership 30.00%    
Share in net assets ₩ 5,855    
Investment differential 2,110    
Intercompany transaction 0    
Others (consolidated FS) 0    
Book value 7,965 0  
Haeparang Energy Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 8,885    
Effective percentage of ownership 25.00%    
Share in net assets ₩ 2,221    
Investment differential 20    
Intercompany transaction 0    
Others (consolidated FS) 0    
Book value 2,241 0  
Saemangeum Sebit Power Plant Co., Ltd.      
Disclosure of associates [line items]      
Net assets ₩ 8,296    
Effective percentage of ownership 69.55%    
Share in net assets ₩ 5,770    
Investment differential 230    
Intercompany transaction 0    
Others (consolidated FS) 0    
Book value ₩ 6,000 [4] ₩ 0  
[1] The effective percentage of ownership is 22.02% considering treasury stocks.
[2] According to the shareholders’ agreement, additional investment of 50% of total stake is agreed by March 2022.
[3] 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.
[4] 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.