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Commitments for Expenditure - Summary of Commitments For Acquisition of Property, Plant and Equipment (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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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 |  | ₩ 57,226 | ₩ 57,203
Commitments for expenditure remaining liability balances |  | 417 | 12,595
Purchase of cable (PVC, 1C, 2500SQ) 103,374M and others (Bukdangjin-Shin-Tangjung) |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 51,796 | 50,151
Commitments for expenditure remaining liability balances |  | 20,661 | 37,638
Purchase of GIS (362kV, 6300A, 63kA) 23CB – Youngseo S/S |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 37,168 | 37,168
Commitments for expenditure remaining liability balances |  | 15,109 | 16,788
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 (Kyungin Construction) |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 58,271 | 58,269
Commitments for expenditure remaining liability balances |  | 746 | 3,883
Purchase of GIS (362kV, 6300A, 63kA) 25CB – Migeum S/S |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 35,136 | 33,841
Commitments for expenditure remaining liability balances |  | 20,370 | 25,641
Purchase of cable (PVC, 1C, 2000SQ) 5,862M and others (Baekun-Gwangyanghang) |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 35,016 | 35,949
Commitments for expenditure remaining liability balances |  | 703 | 3,232
Concrete pole (10M, general purpose, 350KGF) 126,948 ea and five other equipments (unit price contract) |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 0 | 202,795
Commitments for expenditure remaining liability balances |  | 0 | 95,428
Purchase of GIS (362KV, 6300A, 63KA) Type 19 – Shinyangsan S/S |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 32,460 | 31,834
Commitments for expenditure remaining liability balances |  | 5,635 | 17,334
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 | 40,937
Commitments for expenditure remaining liability balances |  | 654 | 3,748
Purchase of cable (PVC, 1C, 2000SQ) 87,732M and others (Eulwangboonki) |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 36,446 | 36,155
Commitments for expenditure remaining liability balances |  | 1,015 | 10,274
Purchase of GIS(362KV,6300A,63KA) Type 18 – Wolsung S/Y |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 32,090 | 32,090
Commitments for expenditure remaining liability balances |  | 26,742 | 32,090
Purchase of cable (FR CNCO-W,1C,325SQ) 672,300M (unit price contract) |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 0 | 31,387
Commitments for expenditure remaining liability balances |  | 0 | 19,213
Purchase of cable (TR CNCE-W,1C,325SQ) 1,342,000M (unit price contract) |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 0 | 75,620
Commitments for expenditure remaining liability balances |  | 0 | 40,497
Purchase of cable (TR CNCE-W,1C,600SQ) 377,000M (unit price contract) |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 0 | 31,851
Commitments for expenditure remaining liability balances |  | 0 | 17,478
Purchase of cable (TR CNCE-W/AL,1C,400SQ) 2,175,300M (unit price contract) |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 0 | 53,064
Commitments for expenditure remaining liability balances |  | 0 | 29,436
System stabilization ESS equipment (Bubuk S/S) Type 1 |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 222,300 | 222,300
Commitments for expenditure remaining liability balances |  | 145,014 | 222,300
System stabilization ESS equipment (Shinnamwon S/S) Type 1 |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 211,500 | 211,500
Commitments for expenditure remaining liability balances |  | 130,169 | 211,500
System stabilization ESS equipment (Yeongcheon S/S) Type 1 |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 73,104 | 73,104
Commitments for expenditure remaining liability balances |  | 18,604 | 73,104
Concrete pole (10M, general purpose, 500KGF) 111,000 ea and four other equipments |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 67,996 | 0
Commitments for expenditure remaining liability balances |  | 39,971 | 0
Advanced EType low voltage electronic watt-hour meter 1,311,552 ea |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 36,103 | 0
Commitments for expenditure remaining liability balances |  | 0 | 0
System stabilization ESS equipment (Yesan S/S) Type 1 |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 56,403 | 0
Commitments for expenditure remaining liability balances |  | 12,095 | 0
System stabilization ESS equipment (Hamyang S/S) Type 1 |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 35,609 | 0
Commitments for expenditure remaining liability balances |  | 12,870 | 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 |  | 1,113,349 | 2,455,673
Construction of Shin-Hanul Units (#1,2) |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts | [1] | 10,592,760 | 10,327,372
Commitments for expenditure remaining liability balances | [1] | 0 | 97,889
Construction of Shin-Hanul Units (#3,4) |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 11,680,361 | 11,007,232
Commitments for expenditure remaining liability balances |  | 10,935,737 | 10,858,828
Other 36 contracts |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 1,631,574 | 853,941
Commitments for expenditure remaining liability balances |  | 1,133,467 | 425,149
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 |  | 0 | 10,898
Purchase of equipments for the construction project of Boryeong indoor coal storage yard |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 334,932 | 318,197
Commitments for expenditure remaining liability balances |  | 279,920 | 287,965
Purchase of main machine for Boryeong New Complex Unit 1 |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 281,600 | 0
Commitments for expenditure remaining liability balances |  | 228,053 | 0
Boryeong New Complex Unit 1 Construction Project |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 186,358 | 0
Commitments for expenditure remaining liability balances |  | 186,358 | 0
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 | 12,468
Purchase of gas turbine and turbine equipment of Gimpo combined heat & power plant |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 123,495 | 126,302
Commitments for expenditure remaining liability balances |  | 15,603 | 32,748
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 |  | 220,864 | 221,997
Commitments for expenditure remaining liability balances |  | 214 | 38,714
Construction of Gimpo combined heat & power plant |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 211,372 | 181,798
Commitments for expenditure remaining liability balances |  | 13,960 | 56,558
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 | 197,983
Commitments for expenditure remaining liability balances |  | 193,578 | 197,983
Purchase of heat recovery boiler and accessories for Gumi natural gas power plant |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 65,918 | 0
Commitments for expenditure remaining liability balances |  | 45,299 | 0
Construction of Gumi natural gas power plant |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 210,393 | 204,094
Commitments for expenditure remaining liability balances |  | 173,350 | 204,094
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 | 70,620
Commitments for expenditure remaining liability balances |  | 61,799 | 70,620
Purchase of coal handling machine for construction of Samcheok Units (#1,2) |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 312,150 | 299,048
Commitments for expenditure remaining liability balances |  | 5,682 | 6,687
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 |  | 8,342 | 32,621
Purchase of Hadong thermal power indoor carboniferous plant |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 167,259 | 162,814
Commitments for expenditure remaining liability balances |  | 48,495 | 62,299
Purchase of phase 2 power generation facility for Yeongwol fuel cells |  |  |
Disclosure of Commitments for Expenditure [Line Items] |  |  |
Commitments for Expenditure amounts |  | 86,350 | 86,100
Commitments for expenditure remaining liability balances |  | 219 | 30,527
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 | 81,960
Commitments for expenditure remaining liability balances |  | ₩ 18,290 | ₩ 81,960
[1] | As of December 31, 2023, the commitment amounts include the Shin-Hanul Unit #1, construction of which has completed during the year ended December 31, 2022. In addition, as of December 31, 2023, Shin-hanul Unit #2 is in commissioning.

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