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Investments in Associates 1 (Details) - KRW (₩) ₩ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of associates [line items] |  |  |  |  |  |
Location |  |  |  | Korea |  |
Acquisition cost |  | ₩ 3,509,099 |  | ₩ 3,089,683 |  |
Book value |  | ₩ 6,176,889 |  | ₩ 5,844,464 |  | ₩ 5,232,373
Korea Gas Corporation |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Importing and wholesaling LNG |  | Importing and wholesaling LNG |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 20.47% |  | 20.47% |  |
Acquisition cost |  | ₩ 94,500 |  | ₩ 94,500 |  |
The fair value of associates | [1] | 466,830 |  | 684,180 |  |
Book value |  | ₩ 1,970,643 |  | ₩ 2,085,296 |  | 1,815,513
Korea Electric Power Industrial Development Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Electricity metering and others |  | Electricity metering and others |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 29.00% |  | 29.00% |  |
Acquisition cost |  | ₩ 4,727 |  | ₩ 4,727 |  |
The fair value of associates |  | 69,298 |  | 80,454 |  |
Book value |  | ₩ 29,500 |  | ₩ 31,078 |  | 24,617
YTN Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Broadcasting | [2] | Broadcasting | [3] |
Location | [2],[3] | Korea |  |  |  |
Percentage of ownership |  | 21.43% | [2] | 21.43% | [3] |
Acquisition cost |  | ₩ 59,000 | [2] | ₩ 59,000 | [3] |
The fair value of associates | [4] | 54,180 |  | 50,220 |  |
Book value |  | ₩ 52,303 | [2] | ₩ 55,027 | [3] | 51,828
Gangwon Wind Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities | [5] | Power generation |  | Power generation |  |
Location | [5] | Korea |  | Korea |  |
Percentage of ownership | [5] | 15.00% |  | 15.00% |  |
Acquisition cost | [5] | ₩ 5,725 |  | ₩ 5,725 |  |
Book value |  | ₩ 12,001 | [5] | ₩ 12,158 | [5] | 10,554
Hyundai Green Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation equipment consignment and operation service |  | Power generation equipment consignment and operation service |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 29.00% |  | 29.00% |  |
Acquisition cost |  | ₩ 88,885 |  | ₩ 88,885 |  |
Book value |  | ₩ 118,173 |  | ₩ 119,791 |  | 121,955
Korea Power Exchange |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities | [6] | Management of power market and others |  | Management of power market and others |  |
Location | [6] | Korea |  | Korea |  |
Percentage of ownership | [6] | 100.00% |  | 100.00% |  |
Acquisition cost | [6] | ₩ 127,839 |  | ₩ 127,839 |  |
Book value |  | 274,286 | [6] | 275,126 | [6] | 269,728
Dayone Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Unrecognized equity interest |  | 937 |  | 3,565 |  |
Accumulated unrecognized equity interest |  | 27,954 |  | ₩ 27,017 |  |
Taebaek Wind Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities | [7] |  |  | Power generation |  |
Location | [7] |  |  | Korea |  |
Percentage of ownership | [7] |  |  | 60.00% |  |
Acquisition cost | [7] |  |  | ₩ 11,494 |  |
Book value |  | ₩ 0 |  | ₩ 14,501 | [7] | 6,800
Taebaek Guinemi Wind Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation | [8] | Power generation | [7] |
Location |  | Korea | [8] | Korea | [7] |
Percentage of ownership |  | 67.25% | [8] | 67.25% | [7] |
Acquisition cost |  | ₩ 12,637 | [8] | ₩ 12,637 | [7] |
Book value |  | ₩ 13,530 | [8] | ₩ 13,049 | [7] | 3,357
Daeryun Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities | [5] | Power generation |  | Power generation |  |
Location | [5] | Korea |  | Korea |  |
Percentage of ownership | [5] | 6.85% |  | 6.85% |  |
Acquisition cost | [5] | ₩ 46,373 |  | ₩ 40,854 |  |
Book value |  | ₩ 26,834 | [5] | ₩ 26,727 | [5] | 25,426
KNH Solar Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 27.00% |  | 27.00% |  |
Acquisition cost |  | ₩ 1,296 |  | ₩ 1,296 |  |
Book value |  | ₩ 3,194 |  | ₩ 2,883 |  | 2,278
SPC Power Corporation |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation | [9] | Power generation | [10] |
Location |  | Philippines | [9] | Philippines | [10] |
Percentage of ownership |  | 38.00% | [9] | 38.00% | [10] |
Acquisition cost |  | ₩ 20,635 | [9] | ₩ 20,635 | [10] |
The fair value of associates |  | 92,219 |  | 121,995 |  |
Book value |  | ₩ 78,931 | [9] | ₩ 70,868 | [10] | 65,046
Gemeng International Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | China |  | China |  |
Percentage of ownership |  | 42.00% |  | 34.00% |  |
Acquisition cost |  | ₩ 516,007 |  | ₩ 413,153 |  |
Book value |  | ₩ 705,812 |  | ₩ 578,821 |  | 595,218
PT. Cirebon Electric Power |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Indonesia |  | Indonesia |  |
Percentage of ownership |  | 27.50% |  | 27.50% |  |
Acquisition cost |  | ₩ 40,365 |  | ₩ 40,365 |  |
Book value |  | ₩ 134,259 |  | ₩ 135,114 |  | 121,969
KNOC Nigerian East Oil Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities | [11] | Resources development |  | Resources development |  |
Location | [11] | Nigeria |  | Nigeria |  |
Percentage of ownership | [11] | 14.63% |  | 14.63% |  |
Acquisition cost | [11] | ₩ 12 |  | ₩ 12 |  |
Book value |  | ₩ 0 | [11] | ₩ 0 | [11] | 0
KNOC Nigerian West Oil Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities | [11] | Resources development |  | Resources development |  |
Location | [11] | Nigeria |  | Nigeria |  |
Percentage of ownership | [11] | 14.63% |  | 14.63% |  |
Acquisition cost | [11] | ₩ 12 |  | ₩ 12 |  |
Book value |  | ₩ 0 | [11] | ₩ 0 | [11] | 0
PT Wampu Electric Power |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Indonesia |  | Indonesia |  |
Percentage of ownership |  | 46.00% |  | 46.00% |  |
Acquisition cost |  | ₩ 21,292 |  | ₩ 21,292 |  |
Book value |  | ₩ 34,555 |  | ₩ 37,743 |  | 35,077
PT. Bayan Resources TBK |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Resources development |  | Resources development |  |
Location |  | Indonesia |  | Indonesia |  |
Percentage of ownership |  | 20.00% |  | 20.00% |  |
Acquisition cost |  | ₩ 615,860 |  | ₩ 615,860 |  |
The fair value of associates |  | 11,090,934 |  | 11,326,001 |  |
Book value |  | ₩ 619,207 |  | ₩ 684,719 |  | 661,289
S-Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 49.00% |  | 49.00% |  |
Acquisition cost |  | ₩ 132,300 |  | ₩ 132,300 |  |
Book value |  | ₩ 162,765 |  | ₩ 141,128 |  | 122,786
Pioneer Gas Power Limited |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | India |  | India |  |
Percentage of ownership |  | 38.50% |  | 38.50% |  |
Acquisition cost |  | ₩ 49,831 |  | ₩ 49,831 |  |
Book value |  | 0 |  | 0 |  | 0
Unrecognized equity interest |  | 19,835 |  | 19,248 |  |
Accumulated unrecognized equity interest |  | 76,712 |  | ₩ 56,877 |  |
Eurasia Energy Holdings |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  |  |  | Power generation and resources development |  |
Location |  |  |  | Russia |  |
Percentage of ownership |  |  |  | 40.00% |  |
Acquisition cost |  |  |  | ₩ 461 |  |
Book value |  | 0 |  | 0 |  | 0
Unrecognized equity interest |  | (203) |  | 13 |  |
Accumulated unrecognized equity interest |  | ₩ 0 |  | ₩ 203 |  |
Xe-Pian Xe-Namnoy Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Laos |  | Laos |  |
Percentage of ownership |  | 25.00% |  | 25.00% |  |
Acquisition cost |  | ₩ 87,426 |  | ₩ 87,426 |  |
Book value |  | ₩ 116,378 |  | ₩ 115,584 |  | 92,441
PT. Mutiara Jawa |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Manufacturing and operating floating coal terminal |  | Manufacturing and operating floating coal terminal |  |
Location |  | Indonesia |  | Indonesia |  |
Percentage of ownership |  | 29.00% |  | 29.00% |  |
Acquisition cost |  | ₩ 2,978 |  | ₩ 2,978 |  |
Book value |  | ₩ 5,168 |  | ₩ 3,597 |  | 2,569
Samcheok Eco Materials Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Recycling fly ashes | [12] | Recycling fly ashes | [13] |
Location |  | Korea | [12] | Korea | [13] |
Percentage of ownership |  | 25.54% | [12] | 2.35% | [13] |
Acquisition cost |  | ₩ 686 | [12] | ₩ 686 | [13] |
Book value |  | 0 | [12] | 0 | [13] |
Unrecognized equity interest |  | 3,625 |  | 344 |  |
Accumulated unrecognized equity interest |  | ₩ 4,431 |  | ₩ 806 |  |
Noeul Green Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 29.00% |  | 29.00% |  |
Acquisition cost |  | ₩ 1,740 |  | ₩ 1,740 |  |
Book value |  | 0 |  | 0 |  | 3,808
Unrecognized equity interest |  | (258) |  | 5,470 |  |
Accumulated unrecognized equity interest |  | 5,212 |  | 5,470 |  |
Naepo Green Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Unrecognized equity interest |  | (14,956) |  | 7,209 |  |
Accumulated unrecognized equity interest |  | ₩ 0 |  | ₩ 14,956 |  |
Goseong Green Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 29.00% |  | 29.00% |  |
Acquisition cost |  | ₩ 262,740 |  | ₩ 262,740 |  |
Book value |  | ₩ 287,624 |  | ₩ 288,893 |  | 260,858
Gangneung Eco Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation | [14] | Power generation | [5] |
Location |  | Korea | [14] | Korea | [5] |
Percentage of ownership |  | 29.00% | [14] | 1.61% | [5] |
Acquisition cost |  | ₩ 261,000 | [14] | ₩ 2,900 | [5] |
Book value |  | 254,929 | [14] | 0 | [5] | 2,288
Unrecognized equity interest |  | (14) |  | 14 |  |
Accumulated unrecognized equity interest |  | ₩ 0 |  | ₩ 14 |  |
Shin Pyeongtaek Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 40.00% |  | 40.00% |  |
Acquisition cost |  | ₩ 72,000 |  | ₩ 72,000 |  |
Book value |  | ₩ 145,026 |  | ₩ 133,823 |  | 93,074
Haeng Bok Do Si Photovoltaic Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 28.00% |  | 28.00% |  |
Acquisition cost |  | ₩ 194 |  | ₩ 194 |  |
Book value |  | ₩ 294 |  | ₩ 278 |  | 223
Dongducheon Dream Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities | [15] | Power generation |  | Power generation |  |
Location | [15] | Korea |  | Korea |  |
Percentage of ownership | [15] | 33.61% |  | 33.61% |  |
Acquisition cost | [15] | ₩ 148,105 |  | ₩ 148,105 |  |
Book value |  | ₩ 87,203 | [15] | ₩ 89,300 | [15] | 74,198
Jinbhuvish Power Generation Pvt. Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities | [5] | Power generation |  | Power generation |  |
Location | [5] | India |  | India |  |
Percentage of ownership | [5] | 5.16% |  | 5.16% |  |
Acquisition cost | [5] | ₩ 9,000 |  | ₩ 9,000 |  |
Book value |  | ₩ 0 | [5] | ₩ 0 | [5] | 0
Daejung Offshore Wind Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 46.59% |  | 46.59% |  |
Acquisition cost |  | ₩ 5,190 |  | ₩ 5,190 |  |
Book value |  | ₩ 1,483 |  | ₩ 1,555 |  | 1,704
GS Donghae Electric Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 34.00% |  | 34.00% |  |
Acquisition cost |  | ₩ 204,000 |  | ₩ 204,000 |  |
Book value |  | ₩ 259,085 |  | ₩ 260,145 |  | 243,772
Daegu Photovoltaic Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 29.00% |  | 29.00% |  |
Acquisition cost |  | ₩ 1,230 |  | ₩ 1,230 |  |
Book value |  | ₩ 2,804 |  | ₩ 2,849 |  | 2,342
Busan Green Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 29.00% |  | 29.00% |  |
Acquisition cost |  | ₩ 5,243 |  | ₩ 5,243 |  |
Book value |  | 3,259 |  | ₩ 4,395 |  | 5,032
Gunsan Bio Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities | [5] |  |  | Power generation |  |
Location | [5] |  |  | Korea |  |
Percentage of ownership | [5] |  |  | 18.87% |  |
Acquisition cost | [5] |  |  | ₩ 1,000 |  |
Book value |  | 0 |  | 0 | [5] | 0
Unrecognized equity interest | [16] | 0 |  | 122 |  |
Accumulated unrecognized equity interest | [16] | ₩ 0 |  | ₩ 3,986 |  |
Hansuwon KNP Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Electric material agency |  | Electric material agency |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 28.98% |  | 28.98% |  |
Acquisition cost |  | ₩ 537 |  | ₩ 537 |  |
Book value |  | ₩ 467 |  | ₩ 280 |  | 219
Korea Electric Power Corporation Fund |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities | [17] | Developing electric enterprises |  | Developing electric enterprises |  |
Location | [17] | Korea |  | Korea |  |
Percentage of ownership | [17] | 98.09% |  | 98.09% |  |
Acquisition cost | [17] | ₩ 20,847 |  | ₩ 23,113 |  |
Book value |  | ₩ 23,421 | [17] | ₩ 28,842 | [17] | 47,983
Energy Infra Asset Management Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Asset management | [18] | Asset management | [5] |
Location |  | Korea | [18] | Korea | [5] |
Percentage of ownership |  | 9.90% | [18] | 9.90% | [5] |
Acquisition cost |  | ₩ 297 | [18] | ₩ 297 | [5] |
Book value |  | ₩ 1,213 | [18] | ₩ 1,184 | [5] | 1,066
Daegu clean Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Renewable power generation |  | Renewable power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 28.00% |  | 28.00% |  |
Acquisition cost |  | ₩ 140 |  | ₩ 140 |  |
Book value |  | ₩ 0 |  | ₩ 12 |  | 12
YaksuESS Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Installing ESS related equipment |  | Installing ESS related equipment |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 29.00% |  | 29.00% |  |
Acquisition cost |  | ₩ 210 |  | ₩ 210 |  |
Book value |  | ₩ 285 |  | ₩ 486 |  | 716
Nepal Water & Energy Development Company Private Limited |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities | [19] | Construction and operation of utility plant | [14] | Construction and operation of utility plant |  |
Location | [19] | Nepal | [14] | Nepal |  |
Percentage of ownership | [19] | 68.88% | [14] | 69.06% |  |
Acquisition cost | [19] | ₩ 110,332 | [14] | ₩ 70,228 |  |
Book value |  | ₩ 110,573 | [14],[19] | ₩ 69,940 | [19] | 66,333
Gwangyang Green Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 20.00% |  | 20.00% |  |
Acquisition cost |  | ₩ 26,800 |  | ₩ 26,800 |  |
Book value |  | ₩ 24,638 |  | ₩ 25,044 |  | 25,466
PND Solar Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 29.00% |  | 29.00% |  |
Acquisition cost |  | ₩ 1,250 |  | ₩ 1,250 |  |
Book value |  | ₩ 1,510 |  | ₩ 1,403 |  | 1,229
Hyundai Eco Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities | [5] | Power generation |  | Power generation |  |
Location | [5] | Korea |  | Korea |  |
Percentage of ownership | [5] | 19.00% |  | 19.00% |  |
Acquisition cost | [5] | ₩ 3,610 |  | ₩ 3,610 |  |
Book value |  | ₩ 7,947 | [5] | ₩ 7,631 | [5] | 5,572
YeongGwang Yaksu Wind Electric Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities | [5] | Power generation |  | Power generation |  |
Location | [5] | Korea |  | Korea |  |
Percentage of ownership | [5] | 9.63% |  | 9.63% |  |
Acquisition cost | [5] | ₩ 533 |  | ₩ 533 |  |
Book value |  | ₩ 133 | [5] | ₩ 156 | [5] | 233
Green Energy Electricity Generation Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 29.00% |  | 29.00% |  |
Acquisition cost |  | ₩ 1,189 |  | ₩ 1,189 |  |
Book value |  | ₩ 8 |  | ₩ 1,571 |  | 1,713
Korea Energy Solutions Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | R & D |  | R & D |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 20.00% |  | 20.00% |  |
Acquisition cost |  | ₩ 300 |  | ₩ 300 |  |
Book value |  | ₩ 170 |  | ₩ 93 |  | 123
ITR Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | R & D | [20] | R & D |  |
Location |  | Korea | [20] | Korea |  |
Percentage of ownership |  | 10.00% | [20] | 20.00% |  |
Acquisition cost |  | ₩ 50 | [20] | ₩ 50 |  |
Book value |  | 0 | [20] | 0 |  | 32
Unrecognized equity interest |  | (4) |  | 5 |  |
Accumulated unrecognized equity interest |  | ₩ 1 |  | ₩ 5 |  |
STN Co., Ltd. (formerly, Structure test network Co., Ltd..) |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Technical testing and consulting |  | Technical testing and consulting |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 20.00% |  | 20.00% |  |
Acquisition cost |  | ₩ 25 |  | ₩ 25 |  |
Book value |  | 391 |  | ₩ 366 |  | 306
Namjeongsusang Solar Power Operation Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities | [21] |  |  | Power generation |  |
Location | [21] |  |  | Korea |  |
Percentage of ownership | [21] |  |  | 15.00% |  |
Acquisition cost | [21] |  |  | ₩ 969 |  |
Book value |  | ₩ 0 |  | ₩ 373 | [21] | 361
Indeck Niles Development, LLC |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | USA |  | USA |  |
Percentage of ownership |  | 50.00% |  | 50.00% |  |
Acquisition cost |  | ₩ 263,825 |  | ₩ 263,825 |  |
Book value |  | ₩ 335,401 |  | ₩ 302,038 |  | 246,273
Indeck Niles Asset Management, LLC |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | USA |  | USA |  |
Percentage of ownership |  | 33.33% |  | 33.33% |  |
Acquisition cost |  | ₩ 0 |  | ₩ 0 |  |
Book value |  | ₩ 93 |  | ₩ 94 |  | 111
Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1 |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Holding company |  | Holding company |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 49.00% |  | 49.00% |  |
Acquisition cost |  | ₩ 6,482 |  | ₩ 6,910 |  |
Book value |  | ₩ 6,496 |  | ₩ 6,932 |  | 7,138
Suwon New Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 39.90% |  | 39.90% |  |
Acquisition cost |  | ₩ 798 |  | ₩ 798 |  |
Book value |  | ₩ 1,022 |  | ₩ 919 |  | 1,035
Gwangbaek Solar Power Investment Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 44.00% |  | 44.00% |  |
Acquisition cost |  | ₩ 4,757 |  | ₩ 4,757 |  |
Book value |  | ₩ 5,155 |  | ₩ 5,133 |  | 4,806
Go deok Clean Energy Co., Ltd |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Fuel cell generation |  | Fuel cell generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 40.00% |  | 40.00% |  |
Acquisition cost |  | ₩ 5,560 |  | ₩ 5,560 |  |
Book value |  | ₩ 4,723 |  | ₩ 4,420 |  | 4,302
SureDataLab Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | R & D |  | R & D |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 23.95% |  | 23.95% |  |
Acquisition cost |  | ₩ 126 |  | ₩ 126 |  |
Book value |  | ₩ 114 |  | ₩ 177 |  | 128
SEP Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | R & D |  | R & D |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 21.26% |  | 21.26% |  |
Acquisition cost |  | ₩ 27 |  | ₩ 27 |  |
Book value |  | 0 |  | 0 |  | 7
Unrecognized equity interest |  | 1 |  | 14 |  |
Accumulated unrecognized equity interest |  | ₩ 15 |  | ₩ 14 |  |
Hankook Electric Power Information Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities | [22] | R & D |  | R & D |  |
Location | [22] | Korea |  | Korea |  |
Percentage of ownership | [22] | 16.49% |  | 16.49% |  |
Acquisition cost | [22] | ₩ 38 |  | ₩ 38 |  |
Book value |  | ₩ 214 | [22] | ₩ 220 | [22] | 161
Tronix Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities | [22] | R & D |  | R & D |  |
Location | [22] | Korea |  | Korea |  |
Percentage of ownership | [22] | 12.50% |  | 12.50% |  |
Acquisition cost | [22] | ₩ 75 |  | ₩ 75 |  |
Book value |  | ₩ 220 | [22] | ₩ 66 | [22] | 109
O2&B Global Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | R & D |  | R & D |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 20.00% |  | 20.00% |  |
Acquisition cost |  | ₩ 25 |  | ₩ 25 |  |
Book value |  | ₩ 21 |  | ₩ 36 |  | 35
Muan Sunshine Solar Power Plant Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 20.00% |  | 20.00% |  |
Acquisition cost |  | ₩ 1,570 |  | ₩ 1,570 |  |
Book value |  | ₩ 2,822 |  | ₩ 2,562 |  | 1,268
Bigeum Resident Photovoltaic Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 29.90% |  | 29.90% |  |
Acquisition cost |  | ₩ 1 |  | ₩ 1 |  |
Book value |  | 0 |  | 0 |  | 0
Unrecognized equity interest |  | (460) |  | 162 |  |
Accumulated unrecognized equity interest |  | ₩ 0 |  | ₩ 460 |  |
Goesan Solar Park Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 29.00% |  | 29.00% |  |
Acquisition cost |  | ₩ 1,276 |  | ₩ 1,276 |  |
Book value |  | ₩ 2,877 |  | ₩ 2,591 |  | 1,927
Saemangeum Heemang Photovoltaic Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 35.00% |  | 35.00% |  |
Acquisition cost |  | ₩ 11,022 |  | ₩ 11,022 |  |
Book value |  | ₩ 14,420 |  | ₩ 13,010 |  | 10,238
Bitgoel Eco Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 49.25% |  | 49.25% |  |
Acquisition cost |  | ₩ 7,880 |  | ₩ 7,880 |  |
Book value |  | ₩ 12,394 |  | ₩ 8,951 |  | 4,356
Jeju Gimnyeong Wind Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 30.00% |  | 30.00% |  |
Acquisition cost |  | ₩ 714 |  | ₩ 714 |  |
Book value |  | ₩ 246 |  | ₩ 872 |  | 911
Seoroseoro Sunny Power Plant Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 42.58% |  | 42.58% |  |
Acquisition cost |  | ₩ 706 |  | ₩ 706 |  |
Book value |  | ₩ 941 |  | ₩ 859 |  | 721
Muan Solar park Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 20.00% |  | 20.00% |  |
Acquisition cost |  | ₩ 4,400 |  | ₩ 4,400 |  |
Book value |  | ₩ 6,830 |  | ₩ 7,838 |  | 6,083
YuDang Solar Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 20.00% |  | 20.00% |  |
Acquisition cost |  | ₩ 360 |  | ₩ 360 |  |
Book value |  | ₩ 570 |  | ₩ 586 |  | 565
Anjwa Smart Farm & Solar City Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 20.00% |  | 20.00% |  |
Acquisition cost |  | ₩ 5,651 |  | ₩ 5,651 |  |
Book value |  | ₩ 7,665 |  | 8,662 |  | 6,784
KPE Green Energy Co., Ltd. (formerly, Daewon Green Energy Co., Ltd.) |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  |  |  |
Location |  | Korea |  |  |  |
Percentage of ownership |  | 25.36% |  |  |  |
Acquisition cost |  | ₩ 3,910 |  |  |  |
Book value |  | 7,779 |  | ₩ 4,485 |  |
Daewon Green Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  |  |  | Power generation |  |
Location |  |  |  | Korea |  |
Percentage of ownership |  |  |  | 25.36% |  |
Acquisition cost |  |  |  | ₩ 3,910 |  |
Book value |  | ₩ 7,779 |  | ₩ 4,485 |  | 3,877
G.GURU Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | R & D |  | R & D |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 24.65% |  | 24.65% |  |
Acquisition cost |  | ₩ 493 |  | ₩ 493 |  |
Book value |  | ₩ 167 |  | ₩ 300 |  | 403
UD4M Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities | [23] | R & D |  | R & D |  |
Location | [23] | Korea |  | Korea |  |
Percentage of ownership | [23] | 12.50% |  | 12.50% |  |
Acquisition cost | [23] | ₩ 75 |  | ₩ 75 |  |
Book value | [23] | ₩ 150 |  | ₩ 161 |  |
Dongbu Highway Solar Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea | [23] | Korea |  |
Percentage of ownership |  | 20.00% |  | 20.00% |  |
Acquisition cost |  | ₩ 190 |  | ₩ 190 |  |
Book value |  | ₩ 380 |  | ₩ 352 |  |
Seobu Highway Solar Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 20.00% |  | 20.00% |  |
Acquisition cost |  | ₩ 195 |  | ₩ 195 |  |
Book value |  | ₩ 406 |  | ₩ 316 |  |
Korea Energy Data Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | R & D |  | R & D |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 29.37% |  | 29.37% |  |
Acquisition cost |  | ₩ 60 |  | ₩ 60 |  |
Book value |  | ₩ 36 |  | ₩ 62 |  | 62
Gangneung Sacheon Fuel Cell Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 41.00% |  | 41.00% |  |
Acquisition cost |  | ₩ 5,695 |  | ₩ 5,695 |  |
Book value |  | ₩ 7,870 |  | ₩ 4,277 |  | 1,878
KOSTURE Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities | [5] | Coal recycling business |  | Coal recycling business |  |
Location | [5] | Korea |  | Korea |  |
Percentage of ownership | [5] | 4.42% |  | 0.82% |  |
Acquisition cost | [5] | ₩ 7 |  | ₩ 1 |  |
Book value |  | ₩ 8 | [5] | ₩ 1 | [5] | 0
Taebaek Gadeoksan Wind Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 34.00% |  | 34.00% |  |
Acquisition cost |  | ₩ 12,570 |  | ₩ 12,570 |  |
Book value |  | ₩ 19,426 |  | ₩ 20,040 |  | 16,495
Chuncheon Green Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 45.00% |  | 45.00% |  |
Acquisition cost |  | ₩ 9,540 |  | ₩ 9,540 |  |
Book value |  | ₩ 8,900 |  | ₩ 9,155 |  | 3,372
Yeomsubong Wind Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation | [24] | Power generation | [25] |
Location |  | Korea | [24] | Korea | [25] |
Percentage of ownership |  | 29.00% | [24] | 3.81% | [25] |
Acquisition cost |  | ₩ 1,411 | [24] | ₩ 95 | [25] |
Book value |  | ₩ 871 | [24] | ₩ 62 | [25] | 95
Yeongyang Wind Power Corporation II |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 30.00% |  | 30.00% |  |
Acquisition cost |  | ₩ 7,965 |  | ₩ 7,965 |  |
Book value |  | ₩ 10,100 |  | ₩ 7,461 |  | 7,965
Haeparang Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 25.00% |  | 25.00% |  |
Acquisition cost |  | ₩ 2,241 |  | ₩ 2,241 |  |
Book value |  | ₩ 2,104 |  | ₩ 2,188 |  | 2,241
Saemangeum Sebit Power Plant Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation | [26] | Power generation | [27] |
Location |  | Korea | [26] | Korea | [27] |
Percentage of ownership |  | 55.14% | [26] | 63.33% | [27] |
Acquisition cost |  | ₩ 21,037 | [26] | ₩ 13,788 | [27] |
Book value |  | 37,191 | [26] | 23,199 | [27] | 6,000
Nghi Son 2 Power LLC |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Unrecognized equity interest |  | 0 |  | (18,940) |  |
Accumulated unrecognized equity interest |  | 0 |  | 0 |  |
Barakah One Company |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Unrecognized equity interest |  | 46,746 |  | 51,137 |  |
Accumulated unrecognized equity interest |  | 140,719 |  | 93,973 |  |
Incheon New Power Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Unrecognized equity interest |  | 0 |  | (163) |  |
Accumulated unrecognized equity interest |  | 0 |  | 0 |  |
KAPES, Inc. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Unrecognized equity interest |  | (145) |  | (355) |  |
Accumulated unrecognized equity interest |  | 3,015 |  | 3,160 |  |
Chester Solar IV SpA |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Unrecognized equity interest |  | 0 |  | (21) |  |
Accumulated unrecognized equity interest |  | ₩ 0 |  | ₩ 0 |  |
Boulder Solar III, LLC |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | USA |  | USA |  |
Percentage of ownership |  | 30.00% |  | 30.00% |  |
Acquisition cost |  | ₩ 715 |  | ₩ 715 |  |
Book value |  | ₩ 754 |  | ₩ 744 |  |
PlatformN. Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | R & D |  | R & D |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 29.58% |  | 29.58% |  |
Acquisition cost |  | ₩ 105 |  | ₩ 105 |  |
Book value |  | 0 |  | 84 |  |
Unrecognized equity interest |  | 62 |  | 0 |  |
Accumulated unrecognized equity interest |  | ₩ 62 |  | ₩ 0 |  |
PT. Cirebon Energi Prasarana |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities | [21] | Power generation |  | Power generation |  |
Location | [21] | Indonesia |  | Indonesia |  |
Percentage of ownership | [21] | 10.00% |  | 10.00% |  |
Acquisition cost | [21] | ₩ 26,710 |  | ₩ 26,710 |  |
Book value |  | ₩ 76,597 | [21] | ₩ 69,035 | [21] | 0
Green Radiation Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities | [22] | R & D |  | R & D |  |
Location | [22] | Korea |  | Korea |  |
Percentage of ownership | [22] | 10.00% |  | 10.00% |  |
Acquisition cost | [22] | ₩ 20 |  | ₩ 20 |  |
Book value | [22] | ₩ 26 |  | ₩ 11 |  |
Future Convergence Technology Laboratory. Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | R & D |  | R & D |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 20.12% |  | 20.12% |  |
Acquisition cost |  | ₩ 76 |  | ₩ 76 |  |
Book value |  | ₩ 36 |  | ₩ 50 |  |
Eco Motion Co., Ltd. (formerly, SC E&G. Co,. Ltd.) |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | R & D |  |  |  |
Location |  | Korea |  |  |  |
Percentage of ownership |  | 20.00% |  |  |  |
Acquisition cost |  | ₩ 90 |  |  |  |
Book value |  | 267 |  |  |  |
SC E&G. Co,. Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  |  |  | R & D |  |
Location |  |  |  | Korea |  |
Percentage of ownership |  |  |  | 20.00% |  |
Acquisition cost |  |  |  | ₩ 90 |  |
Book value |  | ₩ 267 |  | ₩ 214 |  | 0
REC's Innovation Co., Ltd. (formerly, Wang San Engineering. Co,. Ltd..) |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | R & D | [18] | R & D |  |
Location |  | Korea | [18] | Korea |  |
Percentage of ownership |  | 16.67% | [18] | 20.00% |  |
Acquisition cost |  | ₩ 81 | [18] | ₩ 81 |  |
Book value |  | ₩ 120 | [18] | ₩ 166 |  | 0
ACE |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | R & D |  | R & D |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 20.00% |  | 20.00% |  |
Acquisition cost |  | ₩ 25 |  | ₩ 20 |  |
Book value |  | ₩ 2 |  | ₩ 20 |  | 0
Environment and Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities | [22] | R & D |  | R & D |  |
Location | [22] | Korea |  | Korea |  |
Percentage of ownership | [22] | 10.54% |  | 10.54% |  |
Acquisition cost | [22] | ₩ 11 |  | ₩ 11 |  |
Book value |  | ₩ 9 | [22] | ₩ 10 | [22] | 0
Santiago Solar Power SpA |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Chile |  | Chile |  |
Percentage of ownership |  | 50.00% |  | 50.00% |  |
Acquisition cost |  | ₩ 13,851 |  | ₩ 13,851 |  |
Book value |  | ₩ 11,769 |  | ₩ 13,373 |  | 0
Yanggu Floating Photovoltaic Power Plant Inc. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  | Power generation |  |
Location |  | Korea |  | Korea |  |
Percentage of ownership |  | 29.00% |  | 29.00% |  |
Acquisition cost |  | ₩ 904 |  | ₩ 904 |  |
Book value |  | 760 |  | 903 |  | ₩ 0
International Offshore Power Transmission Holding Company Limited [Member] |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Unrecognized equity interest |  | (23,378) |  | 23,378 |  |
Accumulated unrecognized equity interest |  | ₩ 0 |  | 23,378 |  |
Power Embedded [Member] |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | R & D |  |  |  |
Location |  | Korea |  |  |  |
Percentage of ownership |  | 23.33% |  |  |  |
Acquisition cost |  | ₩ 70 |  |  |  |
Book value |  | ₩ 70 |  | 0 |  |
Changwon SG Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities | [22] | Power generation |  |  |  |
Location | [22] | Korea |  |  |  |
Percentage of ownership | [22] | 18.78% |  |  |  |
Acquisition cost | [22] | ₩ 900 |  |  |  |
Book value |  | ₩ 783 | [22] | 0 |  |
Donpyung Technology. Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | R & D |  |  |  |
Location |  | Korea |  |  |  |
Percentage of ownership |  | 20.00% |  |  |  |
Acquisition cost |  | ₩ 125 |  |  |  |
Book value |  | ₩ 254 |  | 0 |  |
HORANG ENERGY Inc. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  |  |  |
Location |  | Korea |  |  |  |
Percentage of ownership |  | 40.00% |  |  |  |
Acquisition cost |  | ₩ 4,240 |  |  |  |
Book value |  | ₩ 4,149 |  | 0 |  |
Hoenggye Renewable Energy Co Ltd [Member] |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  |  |  |
Location |  | Korea |  |  |  |
Percentage of ownership |  | 36.12% |  |  |  |
Acquisition cost |  | ₩ 2,375 |  |  |  |
Book value |  | ₩ 2,375 |  | 0 |  |
Haman Green Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities |  | Power generation |  |  |  |
Location |  | Korea |  |  |  |
Percentage of ownership |  | 35.00% |  |  |  |
Acquisition cost |  | ₩ 4,771 |  |  |  |
Book value |  | ₩ 2,981 |  | 0 |  |
Songsan Green Energy Co., Ltd. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Key operation activities | [28] | Power generation |  |  |  |
Location | [28] | Korea |  |  |  |
Percentage of ownership | [28] | 60.00% |  |  |  |
Acquisition cost | [28] | ₩ 8,400 |  |  |  |
Book value |  | 8,323 | [28] | 0 |  |
KEPCO KPS CARABAO Corp. |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Unrecognized equity interest |  | 37 |  | 0 |  |
Accumulated unrecognized equity interest |  | ₩ 37 |  | ₩ 0 |  |
[1] | An indicator of impairment has been identified for the Company’s investment in Korea Gas Corporation (“KOGAS”) for the years ended December 31, 2022 and 2023 as management determined that the carrying amount of the investment in KOGAS at ￦2,085,296 million and ￦1,970,642 million respectively were significantly higher than its fair value. Accordingly, management has assessed the recoverable amount of the investment by estimating the Company’s share of the present value of the estimated future cash flows expected to be generated by KOGAS. The carrying amount of KOGAS as at December 31, 2022 and 2023 are supported by the recoverable amount determination and as such, no impairment has been recognized for the years ended December 31, 2022 and 2023.
[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, 2023.
[3] | 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.
[4] | The Company sold all of its shares in YTN Co., Ltd. (21.43 %) on February 15, 2024 at the price of W221,490 million as the Korea Communications Commission approved to sell the Company’s shares in entirety on February 7, 2024 (see Note 51).
[5] | 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.
[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 additional acquisition of the shares, the effective percentage of ownership is more than 50%. However, the Company 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 effective percentage of ownership is more than 50%. However, by the shareholders’ agreement, 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.
[9] | 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.
[10] | 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.
[11] | 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.
[12] | 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. The redeemable convertible preferred stock has been repaid in the current period.
[13] | 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.
[14] | The effective percentage of ownership changed due to the disproportionate capital reduction of financial investors during the year ended December 31, 2023.
[15] | The effective percentage of ownership is 34.01% considering the conversion of redeemable convertible preferred stock into ordinary stock.
[16] | During the year ended December 31, 2023, the entity was reclassified from an associate to financial assets measured at fair value through other comprehensive income.
[17] | 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.
[18] | Although the Company’s effective percentage of ownership is less than 20%, the Company can exercise significant influence on the entity through its contractual right to appoint one director to the entity’s board of directors.
[19] | The effective percentage of ownership is more than 50% but the Company does not hold control over the entity according to the shareholders’ agreement. Accordingly, the entity is classified as an associate.
[20] | Although the Company’s effective percentage of ownership is less than 20%, the entity has been classified as an associate as the Company has significant influence on the entity considering the fact that ordinary resolutions passed at the shareholders’ meeting require the majority decision and the Company has the right to elect the entity’s directors.
[21] | The effective percentage of ownership is less than 20%. However, the entity is classified as an associate because the Company exercises significant influence over the decisions related to finance and operation.
[22] | The effective percentage of ownership is less than 20%. However, the entity is classified as an associate because the Company exercises significant influence over the entity.
[23] | The effective percentage of ownership is 14.29% due to the acquisition of treasury stocks. The effective percentage of ownership is less than 20%. However, the Company exercises significant influence over the decisions related to finance and operation by virtue of right to nominate directors to the board of directors of the entity.
[24] | The effective percentage of ownership decreased due to the disproportionate paid-in capital increase.
[25] | 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 Company exercises significant influence over all decisions related to finance and operation.
[26] | The effective percentage of ownership decreased due to the disproportionate paid-in capital increase during the year ended December 31, 2023. 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.
[27] | 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 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.
[28] | 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.

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