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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
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.