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Transactions between related parties (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Dongducheon Dream Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | ₩ 7,071 | ₩ 6,093 | ₩ 17,041
Electricity purchase | 689,510 | 828,547 | 813,440
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 323 | 332 |
Trade payables | 85,920 | 74,651 |
Non-trade receivables and others | 267 | 298 |
Non-trade payables and others | 12 | 10 |
Korea Gas Corporation |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 116,484 | 99,933 | 88,011
Purchase of power generation fuel | 4,049,486 | 5,191,243 | 3,245,519
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 9,267 | 9,439 |
Trade payables | 462,138 | 601,092 |
Non-trade receivables and others | 38 | 498 |
Non-trade payables and others | 560 | 314 |
Daegu Photovoltaic Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 327 | 128 | 349
REC purchase | 3,626 | 3,745 | 3,646
Outstanding balances for related party transactions [Abstract] |  |  |
Trade payables | 69 | 83 |
Jeongam Wind Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 1,198 | 724 | 30
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 165 | 151 |
Non-trade payables and others | 6 | 2 |
Korea Power Engineering Service Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service sales | 348 | 840 | 1,317
Service purchase | 1,774 | 1,765 | 1,292
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 74 | 0 |
Non-trade receivables and others | 74 | 0 |
KS Solar Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 0 | 0 | 5
REC purchase | 0 | 0 | 900
Heang Bok Do Si Photovoltaic Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 2 | 2 | 2
Rental fee and others | 450 | 455 | 570
Korea Electric Power Industrial Development Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service sales | 11,085 | 10,422 | 14,044
Electricity metering service fee | 245,057 | 261,668 | 289,293
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 243 | 278 |
Trade payables | 3,756 | 0 |
Non-trade receivables and others | 43 | 51 |
Non-trade payables and others | 3,827 | 13,102 |
Goseong Green Energy Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 19,245 | 10,024 | 24,069
Electricity purchase | 32 | 0 | 0
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 103 | 0 |
Non-trade receivables and others | 5,285 | 0 |
Non-trade payables and others | 65,626 | 43,020 |
Gangneung Eco Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service sales | 7,446 | 4,928 | 2,391
Service purchase | 0 | 19 | 0
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 115 | 1 |
Non-trade receivables and others | 65 | 99 |
Shin Pyeongtaek Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 21,218 | 8,468 | 9,025
Electricity purchase | 119,162 | 0 | 0
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 1,013 | 123 |
Trade payables | 64,696 | 0 |
Non-trade receivables and others | 2,281 | 242 |
Non-trade payables and others | 61 | 82 |
Naepo Green Energy Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 154 | 160 | 185
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 18 | 17 |
Noeul Green Energy Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 30 | 30 | 32
REC purchase | 22,767 | 18,282 | 15,862
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 3 | 3 |
Non-trade payables and others | 1,855 | 8,774 |
Samcheok Eco Materials Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 627 | 605 | 237
Electricity purchase | 9,425 | 3,819 | 14
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 59 | 61 |
YTN Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 2,257 | 2,043 | 1,987
Electricity purchase | 333 | 322 | 731
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 97 | 98 |
Non-trade payables and others | 0 | 11 |
Busan Green Energy Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 18 | 19 | 120
Electricity purchase | 13,811 | 25,123 | 12,189
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 1 | 1 |
Non-trade payables and others | 606 | 10,882 |
Gunsan Bio Energy Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 4,755 | 3,611 | 0
Electricity purchase | 3,022 | 0 | 0
Outstanding balances for related party transactions [Abstract] |  |  |
Non-trade receivables and others | 0 | 3,458 |
Korea Electric Vehicle Charge Service |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 1,029 | 578 | 700
Electricity purchase | 536 | 605 | 1,093
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 137 | 69 |
Non-trade receivables and others | 529 | 354 |
Non-trade payables and others | 0 | 56 |
Tamra Offshore Wind Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 0 | 58 | 55
Electricity purchase | 0 | 8,371 | 2,105
Daegu clean Energy Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 0 | 126 | 421
Outstanding balances for related party transactions [Abstract] |  |  |
Non-trade receivables and others | 0 | 17 |
Cheongna Energy Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service sales | 9,922 | 11,688 | 7,980
Service purchase | 58,747 | 58 | 59
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 1,074 | 183 |
Non-trade payables and others |  | 0 |
YaksuESS Co., Ltd [Member] |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service purchase | 1,191 | 0 | 0
Outstanding balances for related party transactions [Abstract] |  |  |
Trade payables | 525 | 0 |
Gangwon Wind Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 2,433 | 2,402 | 994
Electricity purchase | 24,116 | 25,407 | 25,968
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 7 | 10 |
Trade payables | 2,979 | 2,547 |
Gwangyang Green Energy Co., Ltd |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 122 | 874 | 0
Outstanding balances for related party transactions [Abstract] |  |  |
Non-trade receivables and others | 1,334 | 0 |
Hyundai Green Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Design service | 13,106 | 14,031 | 14,280
Electricity purchase | 507,662 | 480,815 | 458,378
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 502 | 390 |
Trade payables | 41,587 | 38,072 |
Korea Power Exchange |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service sales | 7,670 | 6,854 | 8,446
Trading Fees | 120,509 | 137,489 | 207,855
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 1,142 | 847 |
Non-trade receivables and others | 114 | 229 |
Non-trade payables and others | 4,160 | 1,214 |
Hyundai Energy |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service sales | 3,437 | 1,718 | 15,627
Electricity purchase | 2,847 | 3,445 | 87,607
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 128 | 57 |
Trade payables | 175 | 259 |
Non-trade receivables and others | 12,532 | 9,664 |
Non-trade payables and others | 9,178 | 8,021 |
Taebaek Wind Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service sales | 991 | 614 | 813
REC purchase | 7,070 | 8,582 | 6,534
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables |  | 0 |
Trade payables | 358 | 453 |
Non-trade payables and others | 243 | 291 |
Taeback Guinemi Wind Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 77 | 0 | 0
Electricity purchase | 349 | 0 | 0
Outstanding balances for related party transactions [Abstract] |  |  |
Trade payables | 190 | 0 |
Non-trade receivables and others | 2 | 0 |
Pyeongchang Wind Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Design service | 1,189 | 1,166 | 1,176
Service purchase | 5,188 | 6,994 | 4,033
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 4 | 4 |
Non-trade payables and others | 0 | 25 |
Daeryun Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 1,879 | 1,731 | 1,796
Electricity purchase | 144,862 | 184,063 | 146,189
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 144 | 178 |
Trade payables | 19,843 | 15,845 |
Changjuk Wind Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 927 | 758 | 788
Electricity purchase | 6,994 | 7,929 | 6,981
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables |  | 0 |
Trade payables | 447 | 455 |
Non-trade payables and others | 280 | 273 |
GS Donghae Electric Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 15,792 | 7,238 | 11,204
Electricity purchase | 681,379 | 780,233 | 351,367
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 175 | 245 |
Trade payables | 69,811 | 69,820 |
Non-trade receivables and others | 367 | 2,537 |
Non-trade payables and others | 16 | 59 |
KNH Solar Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 17 | 17 | 17
Electricity purchase | 3,377 | 3,586 | 3,947
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 1 | 1 |
Non-trade payables and others | 0 | 0 |
S-Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service sales | 6,535 | 9,118 | 12,852
Electricity purchase | 522,469 | 507,875 | 457,329
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 89 | 922 |
Trade payables | 53,705 | 56,897 |
Non-trade receivables and others | 43 | 34 |
Non-trade payables and others | 0 | 16 |
PND solar., Ltd |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 407 | 12 | 0
Service purchase | 557 | 0 | 0
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 0 | 3 |
Hyundai Eco Energy Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 117 | 0 | 0
Electricity purchase | 6,810 | 0 | 0
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 16 | 0 |
Hadong Mineral Fiber Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service purchase | 0 | 60 | 0
Green Biomass Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 0 | 0 | 0
Woodchip purchase | 0 | 440 | 1,345
Outstanding balances for related party transactions [Abstract] |  |  |
Non-trade payables and others |  | 0 |
YeongGwang Yaksu Wind Electric. Co., Ltd |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 81 | 0 | 0
Electricity purchase | 6,511 | 2,437 | 0
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 5 | 0 |
Trade payables | 0 | 2,679 |
Korea Energy Solutions Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 52 | 0 | 0
Electricity purchase | 15,000 | 0 | 0
Suwon New Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 5,606 | 0 | 0
Outstanding balances for related party transactions [Abstract] |  |  |
Non-trade receivables and others | 2,939 | 0 |
9 Associates (Overseas) |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales and others | 98,450 | 60,318 | 21,864
Electricity purchase and Others | 0 | 31 | 72
4 Associates (Overseas) |  |  |
Outstanding balances for related party transactions [Abstract] |  |  |
Non-trade receivables and others | 1,112 | 455 |
Ecollite Co., Ltd. |  |  |
Outstanding balances for related party transactions [Abstract] |  |  |
Non-trade receivables and others | 210 | 210 |
Daegu Green Power |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 1,151 | 1,022 | 1,131
Electricity purchase | 296,464 | 287,008 | 252,024
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 113 | 110 |
Trade payables | 28,980 | 32,609 |
Non-trade receivables and others | 1 | 12 |
Daejung Offshore Wind Power Co., Ltd. [Member] |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 1 | 1 | 1
KAPES, Inc. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Commission | 504 | 648 | 1,420
Service purchase | 142,511 | 77,758 | 164,165
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 1 | 0 |
Trade payables |  | 0 |
Non-trade receivables and others | 0 | 253 |
Non-trade payables and others | 50,738 | 338 |
Dangjin Eco Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Technical fee | 4 | 3,424 | 670
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 2 | 0 |
Non-trade receivables and others | 0 | 18 |
Non-trade payables and others | 0 | 0 |
Honam Wind Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 657 | 415 | 552
Electricity purchase | 5,306 | 7,700 | 5,962
Outstanding balances for related party transactions [Abstract] |  |  |
Trade payables | 347 | 432 |
Non-trade payables and others | 1,671 | 3,573 |
Seokmun Energy Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service sales | 1,495 | 1,897 | 1,765
REC purchase | 26,370 | 31,759 | 21,674
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 51 | 39 |
Non-trade receivables and others | 136 | 303 |
Non-trade payables and others | 4,750 | 5,043 |
Incheon New Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Construction revenue | 354 | 568 | 539
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 0 | 128 |
KW Nuclear Components Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service sales | 721 | 839 | 644
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 4 | 4 |
Non-trade receivables and others | 15 | 31 |
Chun-cheon Energy Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 2,397 | 2,471 | 4,855
REC purchase | 313,471 | 320,954 | 194,136
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 260 | 20 |
Trade payables | 23,438 | 33,796 |
Non-trade receivables and others | 5,362 | 308 |
Yeonggwangbaeksu Wind Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 1,744 | 1,540 | 1,654
Electricity purchase | 11,739 | 11,366 | 11,124
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 6 | 7 |
Trade payables | 671 | 736 |
Non-trade receivables and others | 157 | 0 |
Non-trade payables and others | 1,526 | 789 |
Yeonggwang Wind Power Co., Ltd |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 705 | 46 | 0
Electricity purchase | 11,940 | 0 | 0
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 10 | 10 |
Non-trade receivables and others | 54 | 0 |
Non-trade payables and others | 2,432 | 0 |
KEPCO-Uhde Inc. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service sales | 15 | 17 | 34
Outstanding balances for related party transactions [Abstract] |  |  |
Non-trade payables and others | 9 | 4 |
Busan Shinho Solar Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 452 | 362 | 87
REC purchase | 7,843 | 7,901 | 7,984
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 2 | 2 |
Trade payables | 148 | 175 |
Non-trade payables and others | 733 | 717 |
Daesan Green Energy Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 39 | 0 | 0
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 6 | 0 |
Cheong-Song Noraesan Wind Power Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 6 | 0 | 0
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 1 | 0 |
Saemangeum Solar Power Co., Ltd |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service sales | 2,230 | 0 | 0
Outstanding balances for related party transactions [Abstract] |  |  |
Non-trade receivables and others | 2,197 | 0 |
Jaeun Resident Wind Power Plant Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 105 | 0 | 0
25 Joint ventures (Overseas) |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales and others | 1,275,279 | 206,054 | 131,344
Electricity purchase and Others | 7,232 | 1,404 | 2,785
14 Joint ventures (Overseas) |  |  |
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 51,700 | 30,208 |
Non-trade receivables and others | 13,652 | 740 |
Non-trade payables and others | 87,404 | 18,379 |
Global Trade Of Power System Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service purchase | 502 | 565 | 414
Expressway Solar-light Power |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity purchase | 3,067 | 3,513 | 2,941
Yeongwol Energy Station Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service sales | 0 | 373 | 830
REC purchase | 0 | 4,019 | 14,256
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 0 | 0 |
DS POWER Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service sales | 0 | 565 | 5,819
Outstanding balances for related party transactions [Abstract] |  |  |
Trade receivables | 0 | 0 |
Ulleungdo Natural Energy Co., Ltd. |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Service sales | 0 | 292 | 1,013
Service purchase | 0 | 63 | 119
Korea Development Bank |  |  |
Disclosure of transactions between related parties [Line Items] |  |  |
Electricity sales | 3,948 | 3,524 | 3,239
Dividend paid | 20 | 166,876 | 418,407
Interest income | 2,091 | 4,438 | 1,685
Interest expense | 4,063 | 5,043 | ₩ 4,573
Outstanding balances for related party transactions [Abstract] |  |  |
Non-trade receivables and others | 146,416 | 12,125 |
Non-trade payables and others | 152 | 218 |
Accrued interest income | 1,630 | 1,147 |
Derivative assets | 41,368 | 27,306 |
Derivative liabilities | ₩ 6,531 | ₩ 18,095 |

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