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Commitments for Expenditure - Summary of Commitments For Acquisition of Property, Plant and Equipment (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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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 | ₩ 57,203 | ₩ 57,046
Commitments for expenditure remaining liability balances | 12,595 | 16,240
Purchase of cable (PVC, 1C, 2500SQ) 103,374M and others (Bukdangjin-Shin-Tangjung) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 50,151 | 46,616
Commitments for expenditure remaining liability balances | 37,638 | 34,102
Purchase of GIS (362kV, 6300A, 63kA) 23CB – Youngseo S/S |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 37,168 | 36,143
Commitments for expenditure remaining liability balances | 16,788 | 25,292
Purchase of GIS (362kV, 6300A, 63kA) 26CB – Hwasung S/S |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 0 | 40,010
Commitments for expenditure remaining liability balances | 0 | 5,540
Purchase of GIS (362kV, 6300A, 63kA) 27CB – Kwangyang S/S |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 37,744 | 37,744
Commitments for expenditure remaining liability balances | 140 | 140
Purchase of cable (PVC, 1C, 2500SQ) 100,548M and others |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 58,269 | 56,860
Commitments for expenditure remaining liability balances | 3,883 | 34,576
Purchase of GIS (362kV, 6300A, 63kA) 25CB – Migeum S/S |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 33,841 | 32,000
Commitments for expenditure remaining liability balances | 25,641 | 26,700
Advanced E-Type low-pressure electronic power meter 1,320,000 ea |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 0 | 65,972
Commitments for expenditure remaining liability balances | 0 | 23,262
Purchase of cable (PVC, 1C, 2000SQ) 5,862M and others (Baekun-Gwangyanghang) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 35,949 | 34,423
Commitments for expenditure remaining liability balances | 3,232 | 23,297
Purchase of cable (TR CNCE-W,1C,325SQ) 1,016,000M |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 0 | 66,581
Commitments for expenditure remaining liability balances | 0 | 40,254
Purchase of cable (TR CNCE-W,1C,600SQ) 485,000M |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 0 | 46,194
Commitments for expenditure remaining liability balances | 0 | 37,810
Purchase of cable (TR CNCE-W/AL,1C,400SQ) 3,303,900M |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 0 | 87,382
Commitments for expenditure remaining liability balances | 0 | 83,628
Concrete pole (10M, general purpose, 350KGF) 126,948 ea and five other equipments |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 202,795 | 188,338
Commitments for expenditure remaining liability balances | 95,428 | 168,456
Purchase of GIS (362KV, 6300A, 63KA) 19 – Shinyangsan S/S |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 31,834 | 31,464
Commitments for expenditure remaining liability balances | 17,334 | 31,464
Purchase Of Cable (Pvc, 1c, 2500sq) 57,868m And Others (Goduk-Seoansung) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 40,937 | 0
Commitments for expenditure remaining liability balances | 3,748 | 0
Purchase of cable (PVC, 1C, 2000SQ) 87,732M and others (Eulwangboonki) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 36,155 | 0
Commitments for expenditure remaining liability balances | 10,274 | 0
GIS(362KV,6300A,63KA) 18 – Wolsung S/Y |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 32,090 | 0
Commitments for expenditure remaining liability balances | 32,090 | 0
Purchase of cable (FR CNCO-W,1C,325SQ) 672,300M |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 31,387 | 0
Commitments for expenditure remaining liability balances | 19,213 | 0
Purchase of cable (TR CNCE-W,1C,325SQ) 1,342,000M |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 75,620 | 0
Commitments for expenditure remaining liability balances | 40,497 | 0
Purchase of cable (TR CNCE-W,1C,600SQ) 377,000M |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 31,851 | 0
Commitments for expenditure remaining liability balances | 17,478 | 0
Purchase of cable (TR CNCE-W/AL,1C,400SQ) 2,175,300M |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 53,064 | 0
Commitments for expenditure remaining liability balances | 29,436 | 0
System stabilization ESS equipment (Bubuk S/S) 1 Type |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 222,300 | 0
Commitments for expenditure remaining liability balances | 222,300 | 0
System stabilization ESS equipment (Shinnamwon S/S) Type 1 |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 211,500 | 0
Commitments for expenditure remaining liability balances | 211,500 | 0
System stabilization ESS equipment (Yeongcheon S/S) Type 1 |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 73,104 | 0
Commitments for expenditure remaining liability balances | 73,104 | 0
Construction of Saeul Units (#3,4) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 9,800,424 | 9,800,424
Commitments for expenditure remaining liability balances | 2,455,673 | 3,479,667
Construction of Shin-Hanul Units (#1,2) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 10,327,372 | 9,745,123
Commitments for expenditure remaining liability balances | 97,889 | 0
Other 36 contracts |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 853,941 | 792,485
Commitments for expenditure remaining liability balances | 425,149 | 620,593
Service of designing Seoul Combined Units (#1,2) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 31,148 | 31,841
Commitments for expenditure remaining liability balances | 0 | 934
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 | 5,132 | 7,722
Purchase of turbine generator for construction of Shin-Seocheon Thermal Power Plant |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 107,333 | 105,226
Commitments for expenditure remaining liability balances | 6,214 | 6,301
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 | 10,898 | 10,972
Purchase of equipments for the construction project of Boryeong indoor coal storage yard |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 318,197 | 317,350
Commitments for expenditure remaining liability balances | 287,965 | 317,350
Service of designing Taean Units (#9,10) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 112,909 | 112,909
Commitments for expenditure remaining liability balances | 12,468 | 12,623
Purchase of gas turbine and turbine equipment of Gimpo combined heat & power plant |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 126,302 | 126,302
Commitments for expenditure remaining liability balances | 32,748 | 61,735
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 | 221,997 | 214,053
Commitments for expenditure remaining liability balances | 38,714 | 138,244
Construction of Gimpo Combined Heat & Power Plant |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 181,798 | 130,015
Commitments for expenditure remaining liability balances | 56,558 | 86,323
Purchase of gas turbines, steam turbines, and accessories for Gumi natural gas power plant |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 197,983 | 0
Commitments for expenditure remaining liability balances | 197,983 | 0
Construction of Gumi natural gas power plant |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 204,094 | 0
Commitments for expenditure remaining liability balances | 204,094 | 0
Installation of natural gas supply facility at Gumi natural gas power plant |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 70,620 | 0
Commitments for expenditure remaining liability balances | 70,620 | 0
Purchase of coal handling machine for construction of Samcheok Units (#1,2) |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 299,048 | 286,571
Commitments for expenditure remaining liability balances | 6,687 | 6,215
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 | 3
Purchase of main equipment for Shin-Sejong Combined Thermal Power Plant |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 234,392 | 234,392
Commitments for expenditure remaining liability balances | 32,472 | 200,122
Purchase of Hadong thermal power indoor carboniferous plant |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 162,814 | 148,800
Commitments for expenditure remaining liability balances | 105,504 | 129,042
Purchase of phase 1 power generation facility for Yeongwol fuel cells |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 0 | 88,449
Commitments for expenditure remaining liability balances | 0 | 1,523
Purchase of phase 2 power generation facility for Yeongwol fuel cells |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 86,100 | 0
Commitments for expenditure remaining liability balances | 30,527 | 0
Purchase of fuel cell power generation facilities for the fifth stage of Shinincheon headquarters |  |
Disclosure of Commitments for Expenditure [Line Items] |  |
Commitments for Expenditure amounts | 81,960 | 0
Commitments for expenditure remaining liability balances | ₩ 81,960 | ₩ 0

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