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Commitments for Expenditure (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
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