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Commitments for Expenditure - Summary of Commitments For Acquisition of Property, Plant and Equipment (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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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 | ₩ 57,046 | ₩ 56,574
Commitments for Expenditure Remaining liability balances | 16,240 | 16,038
Purchase of cable (PVC, 1C, 2500SQ) 103,374M and others (Bukdangjin-Shintangjung) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 46,616 | 45,390
Commitments for Expenditure Remaining liability balances | 34,102 | 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 | 25,292 | 29,898
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 | 5,540 | 8,328
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 | 140 | 2,244
Purchase of cable (FR CNCO-W,1C,325SQ) 1,400,000 |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 0 | 59,716
Commitments for Expenditure Remaining liability balances | 0 | 37,249
Purchase of switch (Eco) 9,360 units |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 0 | 40,631
Commitments for Expenditure Remaining liability balances | 0 | 24,031
Purchase of cable (TR CNCE-W,1C,600SQ) 551,200M |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 0 | 37,288
Commitments for Expenditure Remaining liability balances | 0 | 23,100
Purchase of cable (TR CNCE-W/AL,1C,400SQ) 4,464,000M |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 0 | 82,622
Commitments for Expenditure Remaining liability balances | 0 | 51,130
Purchase of cable (FR CNCO-W,1C,325SQ) 1,092,000M |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 0 | 42,068
Commitments for Expenditure Remaining liability balances | 0 | 35,358
Concrete pole (10M, general purpose, 350KGF) 102,435 ea and five other equipments |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 0 | 91,889
Commitments for Expenditure Remaining liability balances | 0 | 80,904
Purchase of cable (PVC, 1C, 2500SQ) 100,548M and others |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 56,860 | 0
Commitments for Expenditure Remaining liability balances | 34,576 | 0
Purchase of GIS (362kV, 6300A, 63kA) 25CB – Migeum S/S |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 32,000 | 0
Commitments for Expenditure Remaining liability balances | 26,700 | 0
Advanced E-Type low-pressure electronic power meter 1,320,000 ea |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 65,972 | 0
Commitments for Expenditure Remaining liability balances | 23,262 | 0
Purchase of cable (PVC, 1C, 2000SQ) 5,862M and others (Baekun-Gwangyanghang) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 34,423 | 0
Commitments for Expenditure Remaining liability balances | 23,297 | 0
Purchase of cable (TR CNCE- W,1C,325SQ) 1,016,000M |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 66,581 | 0
Commitments for Expenditure Remaining liability balances | 40,254 | 0
Purchase of cable (TR CNCE-W,1C,600SQ) 485,000M |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 46,194 | 0
Commitments for Expenditure Remaining liability balances | 37,810 | 0
Purchase of cable (TR CNCE-W/AL,1C,400SQ) 3,303,900M |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 87,382 | 0
Commitments for Expenditure Remaining liability balances | 83,628 | 0
Concrete pole (10M, general purpose, 350KGF) 126,948 ea and five other equipments |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 188,338 | 0
Commitments for Expenditure Remaining liability balances | 168,456 | 0
Purchase of GIS (362KV, 6300A, 63KA) 25 – Shinyangsan S/S |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 31,464 |
Commitments for Expenditure Remaining liability balances | 31,464 |
Construction of Shin-Kori Units (#5,6) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 9,800,424 | 8,625,387
Commitments for Expenditure Remaining liability balances | 3,479,667 | 3,256,117
Construction of Shin-Hanul Units (#1,2) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 9,745,123 | 9,443,635
Commitments for Expenditure Remaining liability balances | 0 | 160,512
Other 30 contracts |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 792,485 | 107,586
Commitments for Expenditure Remaining liability balances | 620,593 | 58,466
Service of designing Seoul Combined Units (#1,2) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 31,841 | 31,841
Commitments for Expenditure Remaining liability balances | 934 | 984
Service of designing Shin-Boryeong Units (#1,2) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 121,114 | 121,163
Commitments for Expenditure Remaining liability balances | 0 | 521
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 | 7,722 | 29,042
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 | 6,301 | 8,279
Electricity construction of Shin-Seocheon Thermal Power Plant |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 340,356 | 282,234
Commitments for Expenditure Remaining liability balances | 0 | 13,524
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 | 10,972 | 11,182
Service of designing Taean Units (#9,10) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 112,909 | 112,813
Commitments for Expenditure Remaining liability balances | 12,623 | 12,933
Purchase of gas turbines and turbine equipment of Gimpo Combined Heat & Power Plant |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 126,302 | 104,600
Commitments for Expenditure Remaining liability balances | 61,735 | 41,840
Purchase of steam turbine, HRSG and Popwer Block of Gimpo Combined Heat & Power Plant |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 214,053 | 210,900
Commitments for Expenditure Remaining liability balances | 138,244 | 147,630
Construction of Gimpo Combined Heat & Power Plant |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 130,015 | 0
Commitments for Expenditure Remaining liability balances | 86,323 | 0
Purchase of coal handling machine for construction of Samcheok Units (#1,2) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 286,571 | 285,158
Commitments for Expenditure Remaining liability balances | 6,215 | 22,751
Purchase of furnace main equipment for construction of Samcheok Units (#1,2) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 0 | 1,065,141
Commitments for Expenditure Remaining liability balances | 0 | 11,609
Purchase of turbine main equipment for Samcheok Units (#1,2) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 0 | 211,349
Commitments for Expenditure Remaining liability balances | 0 | 125
Purchase of main equipment for Namjeju |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 140,144 | 140,144
Commitments for Expenditure Remaining liability balances | 3 | 112
Purchase of main equipment for Shin-Sejong Combined Thermal Power Plant |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 234,392 | 0
Commitments for Expenditure Remaining liability balances | ₩ 200,122 | ₩ 0

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