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Commitments for Expenditure (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Purchase of cable (PVC,1C,2000SQ) 153,000M and others (Shin-Bupyung-Youngseo) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | ₩ 56,574 | ₩ 56,408
Commitments for Expenditure Remaining liability balances | 16,038 | 24,721
Purchase of cable (PVC, 1C, 2500SQ) 103,374M and others (Bukdangjin-Shintangjung) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 45,390 | 45,390
Commitments for Expenditure Remaining liability balances | 32,876 | 32,876
Purchase of GIS (362KV 6300A 63KA) 23CB - YoungseoS/S |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 36,143 | 36,143
Commitments for Expenditure Remaining liability balances | 29,898 | 36,143
Purchase of GIS (362kV, 6300A, 63kA) 26CB - Hwasung S/S |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 40,010 | 40,010
Commitments for Expenditure Remaining liability balances | 8,328 | 15,300
Purchase of GIS (362KV 6300A 63KA) 27CB - KwangyangS/S |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 37,744 | 37,744
Commitments for Expenditure Remaining liability balances | 2,244 | 9,700
Purchase of cable (FR CNCO-W,1C,325SQ) 1,400,000 |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 59,716 | 59,716
Commitments for Expenditure Remaining liability balances | 37,249 | 37,249
Purchase of switch (Eco) 9,360 units |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 40,631 | 40,631
Commitments for Expenditure Remaining liability balances | 24,031 | 24,031
Purchase of cable (TR CNCE-W/AL, 1C, 400SQ) 2,654,400M |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 35,708 | 36,063
Commitments for Expenditure Remaining liability balances | 0 | 6,243
Purchase of cable (TR CNCE-W,1C,600SQ) 551,200M |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 37,288 | 0
Commitments for Expenditure Remaining liability balances | 23,100 | 0
Purchase of cable (TR CNCE-W/AL,1C,400SQ) 4,464,000M |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 82,622 | 0
Commitments for Expenditure Remaining liability balances | 51,130 | 0
Purchase of cable (FR CNCO-W,1C,325SQ) 1,092,000M |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 42,068 | 0
Commitments for Expenditure Remaining liability balances | 35,358 | 0
Concrete pole (10M, general purpose, 350KGF) 102,435 ea and five other equipments |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 91,889 | 0
Commitments for Expenditure Remaining liability balances | 80,904 | 0
Construction of Shin-Kori units (#5,6) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 8,625,387 | 8,625,387
Commitments for Expenditure Remaining liability balances | 3,256,117 | 4,479,956
Construction of Shin-Hanul units (#1,2) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 9,443,635 | 8,306,149
Commitments for Expenditure Remaining liability balances | 160,512 | 0
Other 20 contracts |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 107,586 | 352,710
Commitments for Expenditure Remaining liability balances | 58,466 | 122,890
Service of designing Seoul Combined units (#1,2) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 31,841 | 30,778
Commitments for Expenditure Remaining liability balances | 984 | 2,119
Purchase of main machine for construction of Seoul Combined units (#1,2) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 331,249 | 331,249
Commitments for Expenditure Remaining liability balances | 0 | 15,918
Construction of Seoul Combined units (#1,2) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 409,597 | 387,722
Commitments for Expenditure Remaining liability balances | 0 | 31,150
Service of designing Shin-Boryeong units (#1,2) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 121,163 | 120,668
Commitments for Expenditure Remaining liability balances | 521 | 888
Purchase of main machine for construction of Shin-Boryeong units (#1,2) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 816,317 | 816,317
Commitments for Expenditure Remaining liability balances | 0 | 4,955
Purchase of furnace for construction of Shin-Seocheon thermal power plant |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 305,209 | 305,209
Commitments for Expenditure Remaining liability balances | 29,042 | 43,388
Purchase of turbine generator for construction of Shin-Seocheon thermal power plant |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 105,226 | 105,226
Commitments for Expenditure Remaining liability balances | 8,279 | 10,736
Electricity construction of Shin-Seocheon thermal power plant |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 282,234 | 231,196
Commitments for Expenditure Remaining liability balances | 13,524 | 87,874
Purchase of main machine for Jeju LNG combined |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 166,287 | 166,287
Commitments for Expenditure Remaining liability balances | 11,182 | 12,088
Service of designing Taean units (#9,10) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 112,813 | 112,483
Commitments for Expenditure Remaining liability balances | 12,933 | 12,862
Purchase of gas turbine and turbine equipment of Gimpo combined heat & power plant |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 104,600 | 104,600
Commitments for Expenditure Remaining liability balances | 41,840 | 104,600
Purchase of steam turbine, HRSG and POWER BLOCK of Gimpo combined heat & power plant |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 210,900 | 0
Commitments for Expenditure Remaining liability balances | 147,630 | 0
Purchase of coal handling machine for construction of Samcheok units (#1,2) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 285,158 | 282,927
Commitments for Expenditure Remaining liability balances | 22,751 | 42,785
Purchase of furnace main equipment for construction of Samcheok units (#1,2) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 1,065,141 | 1,066,824
Commitments for Expenditure Remaining liability balances | 11,609 | 11,771
Purchase of turbine main equipment for Samcheok units (#1,2) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 211,349 | 223,550
Commitments for Expenditure Remaining liability balances | 125 | 132
Purchase of main equipment for Namjeju |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 140,144 | 138,486
Commitments for Expenditure Remaining liability balances | ₩ 112 | ₩ 84,982

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