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Investments in Joint Ventures 2 (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Book value [Abstract]    
Beginning balance ₩ 3,147,584 ₩ 2,239,011
Acquisition 123,143 292,033
Disposal (2,774) (35,915)
Dividends received (106,801) (112,612)
Share of profit (loss) 260,677 246,705
Other comprehensive income (loss) 79,554 507,544
Others (15,684) 10,818
Ending balance 3,485,699 3,147,584
Beginning balance 8,992,048 7,471,384
Acquisition 545,252 387,070
Disposal (5,685) (67,313)
Dividends received (592,813) (711,940)
Share of profit (loss) 595,056 1,338,293
Other comprehensive income (loss) 152,752 552,812
Others (24,022) 21,742
Ending balance 9,662,588 8,992,048
KEPCO-Uhde Inc.    
Book value [Abstract]    
Beginning balance 17 [1] 58
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) (10) (43)
Other comprehensive income (loss) 0 0
Others (7) 2
Ending balance 0 17 [1]
Shuweihat Asia Power Investment B.V.    
Book value [Abstract]    
Beginning balance 66,452 37,069
Acquisition 0 0
Disposal 0 0
Dividends received (512) (3,545)
Share of profit (loss) (440) (1,303)
Other comprehensive income (loss) 4,402 34,231
Others 0 0
Ending balance 69,902 66,452
Shuweihat Asia Operation & Maintenance Company    
Book value [Abstract]    
Beginning balance 1,631 [1] 1,380
Acquisition 0 0
Disposal 0 0
Dividends received (1,077) (995)
Share of profit (loss) 1,237 1,154
Other comprehensive income (loss) 27 92
Others 0 0
Ending balance 1,818 1,631 [1]
Waterbury Lake Uranium L.P.    
Book value [Abstract]    
Beginning balance 21,750 [2] 21,590
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 70 1
Other comprehensive income (loss) 792 159
Others 0 0
Ending balance [2] 22,612 21,750
ASM-BG Investicii AD    
Book value [Abstract]    
Beginning balance 14,555 18,692
Acquisition 0 0
Disposal 0 (6,255)
Dividends received (697) (2,395)
Share of profit (loss) 680 2,979
Other comprehensive income (loss) 201 1,534
Others 0 0
Ending balance 14,739 14,555
RES Technology AD    
Book value [Abstract]    
Beginning balance 15,133 16,703
Acquisition 0 0
Disposal 0 (3,673)
Dividends received (697) (333)
Share of profit (loss) (513) 1,427
Other comprehensive income (loss) 460 1,009
Others 0 0
Ending balance 14,383 15,133
KV Holdings, Inc.    
Book value [Abstract]    
Beginning balance 9,659 [3] 2,527
Acquisition 0 0
Disposal 0 0
Dividends received 0 (394)
Share of profit (loss) 280 7,747
Other comprehensive income (loss) 161 (221)
Others (4,914) 0
Ending balance 5,186 9,659 [3]
KEPCO SPC Power Corporation    
Book value [Abstract]    
Beginning balance 179,594 [3] 198,979
Acquisition 0 0
Disposal 0 0
Dividends received 0 (34,280)
Share of profit (loss) 13,224 27,591
Other comprehensive income (loss) 3,726 (12,696)
Others 0 0
Ending balance 196,544 [1],[4] 179,594 [3]
Gansu Datang Yumen Wind Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 6,024 6,635
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 316 (464)
Other comprehensive income (loss) (25) (147)
Others 0 0
Ending balance 6,315 6,024
Datang Chifeng Renewable Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 191,982 204,587
Acquisition 0 0
Disposal 0 0
Dividends received (14,293) (8,732)
Share of profit (loss) 9,012 2,849
Other comprehensive income (loss) 38 (6,722)
Others 0 0
Ending balance 186,739 191,982
Datang KEPCO Chaoyang Renewable Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 44,398 44,217
Acquisition 0 0
Disposal 0 0
Dividends received (1,771) (2,694)
Share of profit (loss) 639 3,936
Other comprehensive income (loss) (59) (1,061)
Others 0 0
Ending balance 43,207 44,398
Rabigh Electricity Company    
Book value [Abstract]    
Beginning balance 214,607 143,678
Acquisition 0 0
Disposal 0 0
Dividends received (6,263) (11,447)
Share of profit (loss) 28,456 31,523
Other comprehensive income (loss) (1,749) 50,853
Others 0 0
Ending balance 235,051 214,607
Rabigh Operation & Maintenance Company Limited    
Book value [Abstract]    
Beginning balance 5,113 4,071
Acquisition 0 0
Disposal 0 0
Dividends received (2,994) (2,735)
Share of profit (loss) 2,759 3,866
Other comprehensive income (loss) 86 (89)
Others 0 0
Ending balance 4,964 5,113
Jamaica Public Service Company Limited    
Book value [Abstract]    
Beginning balance 331,407 294,649
Acquisition 0 0
Disposal 0 0
Dividends received (15,715) (7,752)
Share of profit (loss) 32,862 28,541
Other comprehensive income (loss) 7,959 19,494
Others (6,647) (3,525)
Ending balance 349,866 331,407
KW Nuclear Components Co., Ltd.    
Book value [Abstract]    
Beginning balance 17,090 15,734
Acquisition 0 0
Disposal 0 0
Dividends received (833) (833)
Share of profit (loss) 2,423 2,189
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 18,680 17,090
Busan Shinho Solar Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 6,719 5,841
Acquisition 0 0
Disposal 0 0
Dividends received (1,169) (478)
Share of profit (loss) 1,119 1,356
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 6,669 6,719
Global Trade Of Power System Co., Ltd.    
Book value [Abstract]    
Beginning balance 698 [5] 597
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) (83) 101
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 615 698 [5]
Expressway Solar-light Power Generation Co., Ltd.    
Book value [Abstract]    
Beginning balance 4,754 [6] 3,084
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 433 1,670
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 5,187 4,754 [6]
Amman Asia Electric Power Company    
Book value [Abstract]    
Beginning balance 220,254 [1] 178,679
Acquisition 0 0
Disposal 0 0
Dividends received (15,636) (19,350)
Share of profit (loss) 17,833 23,442
Other comprehensive income (loss) 973 37,483
Others 0 0
Ending balance 223,424 220,254 [1]
KAPES, Inc.    
Book value [Abstract]    
Beginning balance 0 [1] 0
Acquisition 0 0
Disposal 0 0
Dividends received (1,162) 0
Share of profit (loss) 1,162 0
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 0 0 [1]
Honam Wind Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 4,819 4,041
Acquisition 0 0
Disposal 0 0
Dividends received (522) (174)
Share of profit (loss) 446 952
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 4,743 4,819
Korea Power Engineering Service Co., Ltd.    
Book value [Abstract]    
Beginning balance 5,543 5,415
Acquisition 0 0
Disposal 0 0
Dividends received (44) (86)
Share of profit (loss) 349 145
Other comprehensive income (loss) 0 0
Others (140) 69
Ending balance 5,708 5,543
Chun-cheon Energy Co., Ltd.    
Book value [Abstract]    
Beginning balance 32,044 25,896
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 3,039 6,148
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 35,083 32,044
Yeonggwangbaeksu Wind Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 3,151 [5] 2,728
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 292 423
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 3,443 3,151 [5]
Nghi Son 2 Power LLC    
Book value [Abstract]    
Beginning balance 408,839 0
Acquisition 0 172,480
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 14,742 51,218
Other comprehensive income (loss) (5,592) 185,141
Others 0 0
Ending balance 417,989 408,839
Kelar S.A    
Book value [Abstract]    
Beginning balance 117,137 [1] 86,695
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 11,655 3,695
Other comprehensive income (loss) 848 21,241
Others 1,889 5,506
Ending balance 131,529 117,137 [1]
PT. Tanjung Power Indonesia    
Book value [Abstract]    
Beginning balance 92,907 46,546
Acquisition 0 30,147
Disposal 0 0
Dividends received (12,641) (6,104)
Share of profit (loss) 9,679 4,645
Other comprehensive income (loss) 338 18,323
Others (132) (650)
Ending balance 90,151 92,907
Incheon New Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 198 [2] 0
Acquisition 0 0
Disposal 0 0
Dividends received (69) 0
Share of profit (loss) 147 198
Other comprehensive income (loss) 0 0
Others 22 0
Ending balance 298 198 [2]
Seokmun Energy Co., Ltd.    
Book value [Abstract]    
Beginning balance 17,336 13,842
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) (745) 3,494
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 16,591 17,336
Daehan Wind Power PSC    
Book value [Abstract]    
Beginning balance 13,923 5,154
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 2,437 2,446
Other comprehensive income (loss) 66 6,323
Others 0 0
Ending balance 16,426 13,923
Barakah One Company    
Book value [Abstract]    
Beginning balance 0 [7] 0
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 0 0
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance [7] 0 0
Nawah Energy Company    
Book value [Abstract]    
Beginning balance 315 [7] 294
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 10 1
Other comprehensive income (loss) 5 20
Others 0 0
Ending balance [7] 330 315
Momentum    
Book value [Abstract]    
Beginning balance 345 368
Acquisition 0 0
Disposal 0 0
Dividends received (365) (369)
Share of profit (loss) 208 345
Other comprehensive income (loss) 21 1
Others 0 0
Ending balance 209 345
Daegu Green Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 29,360 [8] 24,054
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) (2,856) 5,079
Other comprehensive income (loss) 0 0
Others (74) 227
Ending balance 26,430 29,360 [8]
Yeonggwang Wind Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 20,713 17,646
Acquisition 0 0
Disposal 0 0
Dividends received (2,688) 0
Share of profit (loss) 5,355 3,067
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 23,380 20,713
Chester Solar IV SpA    
Book value [Abstract]    
Beginning balance 181 0
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 324 202
Other comprehensive income (loss) (21) (17)
Others 0 (4)
Ending balance 484 181
Chester Solar V SpA    
Book value [Abstract]    
Beginning balance 156 25
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 35 129
Other comprehensive income (loss) (3) 3
Others 3 (1)
Ending balance 191 156
Diego de Almagro Solar SpA    
Book value [Abstract]    
Beginning balance 540 362
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 447 154
Other comprehensive income (loss) (37) 2
Others 4 22
Ending balance 954 540
South Jamaica Power Company Limited    
Book value [Abstract]    
Beginning balance 46,437 37,360
Acquisition 0 0
Disposal 0 0
Dividends received (7,667) 0
Share of profit (loss) 3,709 6,625
Other comprehensive income (loss) 630 2,452
Others 0 0
Ending balance 43,109 46,437
Daesan Green Energy Co., Ltd.    
Book value [Abstract]    
Beginning balance 19,218 21,244
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 2,977 (2,030)
Other comprehensive income (loss) 0 0
Others (4) 4
Ending balance 22,191 19,218
RE Holiday Holdings LLC    
Book value [Abstract]    
Beginning balance 85,370 73,167
Acquisition 0 0
Disposal 0 0
Dividends received (1,549) (2,288)
Share of profit (loss) (1,425) 2,526
Other comprehensive income (loss) 1,696 11,965
Others 0 0
Ending balance 84,092 85,370
RE Pioneer Holdings LLC    
Book value [Abstract]    
Beginning balance 55,172 47,015
Acquisition 0 0
Disposal 0 0
Dividends received (1,162) (1,337)
Share of profit (loss) (2,089) (275)
Other comprehensive income (loss) 2,160 9,769
Others 0 0
Ending balance 54,081 55,172
RE Barren Ridge 1 Holdings LLC    
Book value [Abstract]    
Beginning balance 3,350 1,883
Acquisition 0 0
Disposal 0 0
Dividends received (3,087) (1,625)
Share of profit (loss) (1,733) (2,886)
Other comprehensive income (loss) 59,624 5,978
Others 0 0
Ending balance 58,154 3,350
RE Astoria 2 LandCo LLC    
Book value [Abstract]    
Beginning balance 6,599 5,998
Acquisition 0 0
Disposal 0 0
Dividends received (354) (388)
Share of profit (loss) 575 571
Other comprehensive income (loss) 117 418
Others 0 0
Ending balance 6,937 6,599
RE Barren Ridge LandCo LLC    
Book value [Abstract]    
Beginning balance 2,333 2,120
Acquisition 0 0
Disposal 0 0
Dividends received (161) (160)
Share of profit (loss) 228 225
Other comprehensive income (loss) 41 148
Others 0 0
Ending balance 2,441 2,333
Laurel SpA    
Book value [Abstract]    
Beginning balance 554 290
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 64 245
Other comprehensive income (loss) (14) 3
Others 9 16
Ending balance 613 554
KIAMCO KOWEPO Bannerton Hold Co Pty Ltd    
Book value [Abstract]    
Beginning balance 3,651 [5] 3,625
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) (23) 26
Other comprehensive income (loss) 91 0
Others 0 0
Ending balance 3,719 3,651 [5]
Chile Solar JV SpA    
Book value [Abstract]    
Beginning balance 9,819 32,457
Acquisition 0 0
Disposal 0 (24,894)
Dividends received 0 0
Share of profit (loss) 3,569 159
Other comprehensive income (loss) 1,276 2,097
Others (14,664) 0
Ending balance 0 9,819
Cheong-Song Noraesan Wind Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 4,263 [2] 4,106
Acquisition 0 0
Disposal 0 0
Dividends received (865) (672)
Share of profit (loss) 358 832
Other comprehensive income (loss) 0 0
Others 0 (3)
Ending balance [2] 3,756 4,263
Chester Solar I SpA    
Book value [Abstract]    
Beginning balance 1,314 1,120
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) (71) 120
Other comprehensive income (loss) (29) (1)
Others 24 75
Ending balance 1,238 1,314
Solar Philippines Calatagan Corporation    
Book value [Abstract]    
Beginning balance 56,902 58,231
Acquisition 0 0
Disposal 0 0
Dividends received (6,025) (1,710)
Share of profit (loss) 6,025 6,081
Other comprehensive income (loss) 1,228 (5,700)
Others 0 0
Ending balance 58,130 56,902
Saemangeum Solar Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 23,551 [9] 23,939
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) (132) (388)
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 23,419 23,551 [9]
Chungsongmeon BongSan wind power Co., Ltd.    
Book value [Abstract]    
Beginning balance 3,470 [5] 3,808
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) (805) (338)
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 2,665 3,470 [5]
Jaeun Resident Wind Power Plant Co., Ltd.    
Book value [Abstract]    
Beginning balance 2,236 [5] 1,958
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) (22) 278
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance [5] 2,214 2,236
DE Energia SpA    
Book value [Abstract]    
Beginning balance 9,536 8,921
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 0 0
Other comprehensive income (loss) 167 615
Others 0 0
Ending balance 9,703 9,536
Dangjin Eco Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 26,859 26,109
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 212 233
Other comprehensive income (loss) (318) 513
Others 0 4
Ending balance 26,753 26,859
Haemodum Solar Co., Ltd.    
Book value [Abstract]    
Beginning balance 3,367 3,081
Acquisition 0 0
Disposal 0 0
Dividends received (392) 0
Share of profit (loss) 147 286
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 3,122 3,367
Yangyang Wind Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 10,864 11,191
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) (429) (327)
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 10,435 10,864
Horus Solar, S.A. De C.V.    
Book value [Abstract]    
Beginning balance 6,976 [10] 5,842
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 3,594 841
Other comprehensive income (loss) 611 293
Others 0 0
Ending balance 11,181 [11] 6,976 [10]
Recursos Solares PV De Mexico II, S.A. De C.V.    
Book value [Abstract]    
Beginning balance 4,899 [10] 4,536
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 4,088 68
Other comprehensive income (loss) 1,948 295
Others 0 0
Ending balance 10,935 [11] 4,899 [10]
Sunmex Renovables, S.A. De C.V.    
Book value [Abstract]    
Beginning balance 1,657 [10] 1,610
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 1,482 (151)
Other comprehensive income (loss) 402 198
Others 0 0
Ending balance 3,541 [11] 1,657 [10]
Stavro Holding II A.B.    
Book value [Abstract]    
Beginning balance 17,171 17,627
Acquisition 0 952
Disposal 0 0
Dividends received 0 0
Share of profit (loss) (17) 157
Other comprehensive income (loss) 149 (1,687)
Others 960 122
Ending balance 18,263 17,171
Solaseado Solar Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 16,233 9,891
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 1,720 6,342
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 17,953 16,233
Yeongam Solar Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 9,879 [5] 6,838
Acquisition 0 0
Disposal 0 0
Dividends received (592) 0
Share of profit (loss) 350 3,041
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance [5] 9,637 9,879
Samsu Wind Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 3,205 [5] 2,828
Acquisition 0 0
Disposal 0 0
Dividends received (514) 0
Share of profit (loss) 331 377
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance [5] 3,022 3,205
Pulau Indah Power Plant Sdn. Bhd.    
Book value [Abstract]    
Beginning balance 26,814 22,099
Acquisition 0 0
Disposal 0 0
Dividends received (27) 0
Share of profit (loss) 671 1,681
Other comprehensive income (loss) (2,360) 3,034
Others 505 0
Ending balance 25,603 26,814
Sam-Yang Photovoltaic Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 0 4,993
Acquisition   0
Disposal   0
Dividends received   0
Share of profit (loss)   (123)
Other comprehensive income (loss)   0
Others   (4,870)
Ending balance   0
NH-Amundi Global Infrastructure Investment Private Investment Trust 21    
Book value [Abstract]    
Beginning balance 21,723 21,456
Acquisition 928 485
Disposal (1,092) (406)
Dividends received (1,568) (1,415)
Share of profit (loss) 1,906 1,603
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 21,897 21,723
Shin-han BNPP Private Investment Trust for East-West Sunlight Dream    
Book value [Abstract]    
Beginning balance 15,587 [1] 16,288
Acquisition 0 0
Disposal (96) (687)
Dividends received 0 0
Share of profit (loss) (4) (14)
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 15,487 15,587 [1]
PT Barito Wahana Tenaga    
Book value [Abstract]    
Beginning balance 137,047 81,595
Acquisition 0 39
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 20,546 13,352
Other comprehensive income (loss) (599) 42,061
Others 0 0
Ending balance 156,994 137,047
Cheongna Energy Co., Ltd.    
Book value [Abstract]    
Beginning balance 10,758 [9] 11,198
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 14,791 (440)
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 25,549 10,758 [9]
Naepo Green Energy Co., Ltd.    
Book value [Abstract]    
Beginning balance 0 0
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 5,285 0
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 5,285 0
Boim Combined Heat and Power Generation Co., Ltd. (formerly, Dayone Energy Co., Ltd.)    
Book value [Abstract]    
Beginning balance 0 [12] 0
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 0 0
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 0 [13] 0 [12]
OneEnergy Asia Limited    
Book value [Abstract]    
Beginning balance 172,218 79,700
Acquisition 79,182 39,033
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 39,091 (18,294)
Other comprehensive income (loss) (525) 71,779
Others 0 0
Ending balance 289,966 172,218
KAS Investment I LLC    
Book value [Abstract]    
Beginning balance 18,247 [2] 15,273
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) (2,223) 2,426
Other comprehensive income (loss) (240) 548
Others 0 0
Ending balance [2] 15,784 18,247
KAS Investment II LLC    
Book value [Abstract]    
Beginning balance 18,173 [2] 15,213
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) (2,225) 2,082
Other comprehensive income (loss) (239) 878
Others 0 0
Ending balance [2] 15,709 18,173
Energyco Co., Ltd. (formerly, Energyco LLC)    
Book value [Abstract]    
Beginning balance 2,190 1,535
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) (50) 655
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 2,140 2,190
CAES, LLC    
Book value [Abstract]    
Beginning balance 20,805 18,435
Acquisition 0 0
Disposal 0 0
Dividends received 0 (217)
Share of profit (loss) (860) (198)
Other comprehensive income (loss) 114 1,756
Others 321 1,029
Ending balance 20,380 20,805
Hapcheon Floating Photovoltaic Power Plant Inc.    
Book value [Abstract]    
Beginning balance 8,471 [5] 6,971
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 1,877 1,500
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance [5] 10,348 8,471
Busan Industrial Solar Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 1,168 612
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) (110) 556
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 1,058 1,168
Bitsolar Energy Co., Ltd.    
Book value [Abstract]    
Beginning balance 352 352
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 0 0
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 352 352
Pulau Indah O&M Sdn. Bhd.    
Book value [Abstract]    
Beginning balance 0 0
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 0 0
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 0 0
Guadalupe Solar SpA    
Book value [Abstract]    
Beginning balance 913 [9] 659
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 322 221
Other comprehensive income (loss) (35) 33
Others 0 0
Ending balance [9] 1,200 913
Omisan Wind Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 10,411 10,633
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) (182) (222)
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 10,229 10,411
Foresight Iberian Solar Group Holding, S.L.    
Book value [Abstract]    
Beginning balance 10,565 9,743
Acquisition 0 1,781
Disposal 0 0
Dividends received 0 0
Share of profit (loss) (2,034) (1,016)
Other comprehensive income (loss) 0 3
Others (412) 54
Ending balance 8,119 10,565
Yeongwol Eco Wind Co., Ltd.    
Book value [Abstract]    
Beginning balance 3,155 3,196
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 869 (41)
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 4,024 3,155
Gurae Resident Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 391 395
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 178 (4)
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 569 391
Cheongju Eco Park Co., Ltd.    
Book value [Abstract]    
Beginning balance 10,490 5,465
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) (1,418) 5,025
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 9,072 10,490
Enel X Midland Photovoltaic, LLC    
Book value [Abstract]    
Beginning balance 1,856 1,688
Acquisition 516 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 170 168
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 2,542 1,856
Geumsungsan Wind Power Co., Ltd.    
Book value [Abstract]    
Beginning balance 3,493 6,053
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 2,022 (2,560)
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 5,515 3,493
KEPCO KPS CARABAO Corp.    
Book value [Abstract]    
Beginning balance 177 [14] 386
Acquisition 0 0
Disposal 0 0
Dividends received 0 (104)
Share of profit (loss) (184) (105)
Other comprehensive income (loss) 7 0
Others 0 0
Ending balance 0 177 [14]
Prime Swedish Holding AB    
Book value [Abstract]    
Beginning balance 36,245 15,441
Acquisition 820 20,896
Disposal 0 0
Dividends received 0 0
Share of profit (loss) (236) (261)
Other comprehensive income (loss) 0 0
Others 1,960 169
Ending balance 38,789 36,245
Goheung New Energy Co., Ltd.    
Book value [Abstract]    
Beginning balance 11,832 11,708
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 3,904 124
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 15,736 11,832
Gunsan Land Solar Co., Ltd.    
Book value [Abstract]    
Beginning balance 27,544 [9] 19,317
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) (5,115) 8,220
Other comprehensive income (loss) 0 7
Others 0 0
Ending balance [9] 22,429 [15] 27,544
Capman Lynx SCA, SICAR    
Book value [Abstract]    
Beginning balance 0 9,976
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 0 (10,195)
Other comprehensive income (loss) 0 5,173
Others 0 (4,954)
Ending balance 0 0
International Offshore Power Transmission Holding Company Limited    
Book value [Abstract]    
Beginning balance 0 0
Acquisition 0 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 338 0
Other comprehensive income (loss) 1,085 0
Others 0 0
Ending balance 1,423 0
Pyeongchang Wind Power Co., Ltd    
Book value [Abstract]    
Beginning balance 14,464 [16] 0
Acquisition 0 0
Disposal 0 0
Dividends received (870) 0
Share of profit (loss) (1,366) 0
Other comprehensive income (loss) 0 0
Others 0 14,464
Ending balance 12,228 [17] 14,464 [16]
Eumseong Eco Park Co., Ltd    
Book value [Abstract]    
Beginning balance 5,557 0
Acquisition 0 5,741
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 2,829 (184)
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 8,386 5,557
Songsan Green Energy Co., Ltd    
Book value [Abstract]    
Beginning balance 1,387 [2] 0
Acquisition 7,000 1,400
Disposal 0 0
Dividends received 0 0
Share of profit (loss) (25) (13)
Other comprehensive income (loss) (39) 0
Others (8,323) 0
Ending balance 0 1,387 [2]
Changwon Nu-ri Energy Co., Ltd    
Book value [Abstract]    
Beginning balance 497 [2] 0
Acquisition 7,595 500
Disposal 0 0
Dividends received 0 0
Share of profit (loss) (27) (3)
Other comprehensive income (loss) (38) 0
Others 0 0
Ending balance 8,027 [5] 497 [2]
Hasami Wind Farm Corporation    
Book value [Abstract]    
Beginning balance 1,589 0
Acquisition 0 1,596
Disposal (1,586) 0
Dividends received 0 0
Share of profit (loss) (3) (7)
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 0 1,589
PungBack Wind Farm Corporation    
Book value [Abstract]    
Beginning balance 6,743 [18] 0
Acquisition 0 7,884
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 1,197 (1,141)
Other comprehensive income (loss) 0 0
Others 0 0
Ending balance 7,940 6,743 [18]
Trumbull Asset Management, LLC    
Book value [Abstract]    
Beginning balance 246 [17] 0
Acquisition 1 0
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 693 252
Other comprehensive income (loss) 0 (1)
Others (4) (5)
Ending balance [17] 936 246
S-Power Chile SpA    
Book value [Abstract]    
Beginning balance 127 0
Acquisition 0 127
Disposal 0 0
Dividends received 0 0
Share of profit (loss) (70) 0
Other comprehensive income (loss) 4 0
Others 3 0
Ending balance 64 127
Seungmun Green Energy    
Book value [Abstract]    
Beginning balance 9,054 0
Acquisition 0 8,973
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 703 120
Other comprehensive income (loss) 0 (39)
Others 0 0
Ending balance 9,757 9,054
Seobusambo highway photovoltaics Co., Ltd    
Book value [Abstract]    
Beginning balance 3,066 [19] 0
Acquisition 0 (1)
Disposal 0 0
Dividends received 0 0
Share of profit (loss) 514 0
Other comprehensive income (loss) 0 0
Others 0 3,067
Ending balance 3,580 3,066 [19]
Yangyang Suri Wind Power Co Ltd [Member]    
Book value [Abstract]    
Beginning balance 0  
Acquisition 10,498  
Disposal 0  
Dividends received 0  
Share of profit (loss) (890)  
Other comprehensive income (loss) 0  
Others 0  
Ending balance 9,608 [2] 0
KEPCO for Power Company [Member]    
Book value [Abstract]    
Beginning balance 0  
Acquisition 3,083  
Disposal 0  
Dividends received 0  
Share of profit (loss) (2,109)  
Other comprehensive income (loss) 25  
Others (564)  
Ending balance 435 [20] 0
Taebaek Wind Power Co., Ltd. [Member]    
Book value [Abstract]    
Beginning balance 0  
Acquisition 0  
Disposal 0  
Dividends received (2,820)  
Share of profit (loss) 2,251  
Other comprehensive income (loss) 0  
Others 14,501  
Ending balance 13,932 0
Jeonju Bio Green Energy Co Ltd [Member]    
Book value [Abstract]    
Beginning balance 0  
Acquisition 3,250  
Disposal 0  
Dividends received 0  
Share of profit (loss) (55)  
Other comprehensive income (loss) 0  
Others 0  
Ending balance 3,195 [9] 0
Kumyang Eco Park Co Ltd [Member]    
Book value [Abstract]    
Beginning balance 0  
Acquisition 3,663  
Disposal 0  
Dividends received 0  
Share of profit (loss) 0  
Other comprehensive income (loss) 0  
Others 0  
Ending balance 3,663 0
Jeongeup Green Power Co Ltd [Member]    
Book value [Abstract]    
Beginning balance 0  
Acquisition 1,560  
Disposal 0  
Dividends received 0  
Share of profit (loss) 0  
Other comprehensive income (loss) 0  
Others 0  
Ending balance 1,560 [21] 0
Hadong Efactory Co Ltd [Member]    
Book value [Abstract]    
Beginning balance 0  
Acquisition 350  
Disposal 0  
Dividends received 0  
Share of profit (loss) 0  
Other comprehensive income (loss) (1)  
Others 0  
Ending balance 349 [2] 0
Namyangju Combined Heat and Power Co Ltd [Member]    
Book value [Abstract]    
Beginning balance 0  
Acquisition 3,850  
Disposal 0  
Dividends received 0  
Share of profit (loss) 0  
Other comprehensive income (loss) 0  
Others 0  
Ending balance 3,850 [22] 0
Wadi Noor Solar Power Company SAOC [Member]    
Book value [Abstract]    
Beginning balance 0  
Acquisition 847  
Disposal 0  
Dividends received 0  
Share of profit (loss) 0  
Other comprehensive income (loss) (1)  
Others 0  
Ending balance 846 0
Fairhaven Energy Storage LLC [Member]    
Book value [Abstract]    
Beginning balance 0  
Acquisition 0  
Disposal 0  
Dividends received 0  
Share of profit (loss) 0  
Other comprehensive income (loss) 0  
Others 0  
Ending balance ₩ 0 [23] ₩ 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 Company 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 less than 50%. However, the entity is classified as a joint venture, because all consent was required to make decisions on related activities.
[3] The Company is planning to sell its investment in SPC Power Corporation, KEPCO SPC Power Corporation, and KV Holdings, Inc. The timing of and proceeds from such sales transaction is not specified as of December 31, 2023.
[4] The Company is planning to sell its investment in SPC Power Corporation, KEPCO SPC Power Corporation, and KV Holdings, Inc. The timing of and proceeds from such sales transaction is 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 effective percentage of ownership is less than 20%. However, decisions in relevant activities must be agreed by ownership parties. Accordingly, the entity is classified as joint ventures.
[8] 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.
[9] The effective percentage of ownership is more than 50%. However, decisions in relevant activities must be agreed by all ownership parties. Accordingly, the entity is classified as a joint venture.
[10] The effective percentage of ownership is less than 20%. However, according to the shareholders' agreement, decisions related principal operation must be agreed by all ownership parties. Accordingly, the Company can exercise significant influence.
[11] The percentage of effective ownership is more than 20%. However, according to the shareholders’ agreement, decisions related principal operation must be agreed by all ownership parties. Accordingly, the entity is classified as a joint venture.
[12] According to the Boim Combined Heat and Power Generation Co., Ltd. (formerly, Dayone Energy Co., Ltd.) Investment Agreement signed in March 2011, the Company has a commitment to guarantee principal and certain returns on shares of Boim Combined Heat and Power Generation Co., Ltd. (formerly, 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.
[13] According to the REC’s Innovation Co., Ltd. (formerly, Wang San Engineering. Co,. Ltd.). Investment Agreement signed in March 2011, the Company has a commitment to guarantee principal and certain returns on shares of REC’s Innovation Co., Ltd. (formerly, Wang San Engineering. 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.
[14] 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.
[15] The nominal percentage of ownership is 75.29% and the effective percentage of ownership is 56.91%, as the Company has an obligation to provide excessive dividend income to Gunsan City when a certain rate of return defined in the shareholders’ agreement is met.
[16] After additional acquisition of the shares, the effective percentage of ownership is more than 50%. However, decisions in relevant activities 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 more than 50%. However, decisions in relevant activities must be agreed by all members of the board of directors. Accordingly, the entity is classified as a joint venture.
[18] The effective percentage of ownership is 37%, considering potential common stock.
[19] Due to the changes in the agreement, the Company 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 activities must be agreed by all members of the board of directors.
[20] Although the Company’s effective percentage of ownership is more than 50%, the entity is reclassified as a joint venture since the entity’s material financial and operational decisions require unanimous agreement of members in the board of directors due to the shareholders’ agreement concluded during the year ended December 31, 2023.
[21] Although the Company’s effective percentage of ownership is less than 20%, the entity is reclassified as a joint venture considering the Company can exercise significant influence on the entity due to the Company’s contractual right to appoint a director to the entity’s board of directors and the minimum number of the entity’s board of directors members required to agree for making decision on material financial and operational policies in accordance with the joint shareholders’ agreement .
[22] Although the Company’s effective percentage of ownership is more than 50%, the entity is classified as a joint venture since the entity’s material financial and operational decisions require unanimous agreement of members in the board of directors.
[23] Although the investment has not yet been paid, commitment to pay 35% of investment in the future has been made.