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Commitments for Expenditure - Summary of Commitments For Acquisition of Property, Plant and Equipment (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2024
Dec. 31, 2023
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 ₩ 57,226
Commitments for expenditure remaining liability balances 417 417
Purchase of cable (PVC, 1C, 2500SQ) 103,374M and others (Bukdangjin-Shin-Tangjung)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 0 51,796
Commitments for expenditure remaining liability balances 0 20,661
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 15,109
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 58,271
Commitments for expenditure remaining liability balances 746 746
Purchase of GIS (362kV, 6300A, 63kA) 25CB – Migeum S/S    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 35,282 35,136
Commitments for expenditure remaining liability balances 13,476 20,370
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 35,016
Commitments for expenditure remaining liability balances 703 703
Purchase of GIS (362KV, 6300A, 63KA) Type 19 – Shinyangsan S/S    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 0 32,460
Commitments for expenditure remaining liability balances 0 5,635
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 654 654
Purchase of cable (PVC, 1C, 2000SQ) 87,732M and others (Eulwangboonki)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 36,446 36,446
Commitments for expenditure remaining liability balances 1,015 1,015
Purchase of GIS (362kV,6300A,63kA) Type 18 – Wolsung S/Y    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 33,057 32,090
Commitments for expenditure remaining liability balances 16,045 26,742
System stabilization ESS equipment (Bubuk S/S) Type 1    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 221,939 222,300
Commitments for expenditure remaining liability balances 42,137 145,014
System stabilization ESS equipment (Shinnamwon S/S) Type 1    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 0 211,500
Commitments for expenditure remaining liability balances 0 130,169
System stabilization ESS equipment (Yeongcheon S/S) Type 1    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 72,779 73,104
Commitments for expenditure remaining liability balances 16,975 18,604
Concrete pole (10M, general purpose, 500KGF) 111,000 ea and four other equipment    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 0 67,996
Commitments for expenditure remaining liability balances 0 39,971
Advanced EType low voltage electronic watt-hour meter 1,311,552 ea    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 0 36,103
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 56,174 56,403
Commitments for expenditure remaining liability balances 11,471 12,095
System stabilization ESS equipment (Hamyang S/S) Type 1    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 35,764 35,609
Commitments for expenditure remaining liability balances 11,468 12,870
Concrete pole (10M, general purpose, 500KGF) 90,000 ea and four other equipment    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 59,473 0
Commitments for expenditure remaining liability balances 36,464 0
Purchase of cable (PVC, 1C, 2500SQ) 53,856M and others (Shinchungjuboonki)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 31,925 0
Commitments for expenditure remaining liability balances 7,756 0
Purchase of GIS (362kV, 6300A, 63kA) Type 31 – East Seoul S/S    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 39,060 0
Commitments for expenditure remaining liability balances 39,060 0
Purchase of cable (PVC, 1C, 2000SQ) 68,613M and others (Dongducheon-Yangju)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 40,933 0
Commitments for expenditure remaining liability balances 28,790 0
Purchase of HVDC cable (PE, 2500SQ) 31,551M and others    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 40,323 0
Commitments for expenditure remaining liability balances 40,323 0
Purchase of HVDC cable (PE, 2500SQ) 30,883M and others    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 40,130 0
Commitments for expenditure remaining liability balances 40,130 0
Stationary reactive power compensation device (Phase 3, ±500MVAR) – Shin Jecheon S/S    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 39,300 0
Commitments for expenditure remaining liability balances 39,300 0
Stationary reactive power compensation device (STATCOM, phase 3, ±500MVAR) – East coast #1C/S    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 37,600 0
Commitments for expenditure remaining liability balances 37,600 0
AMIGO, 1P2W, 60(5)A, Electronic, Class 1.0, 220V, 1,031,728 EA – Annual Unit Price    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 43,054 0
Commitments for expenditure remaining liability balances 38,404 0
Stationary reactive power compensation device (STATCOM/Phase 3, ±500MVAR) – Shin Gapyeong S/S    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 40,590 0
Commitments for expenditure remaining liability balances 40,590 0
Stationary reactive power compensation device (STATCOM/Phase 3, ±500MVAR) – Shin Namwon S/S    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 37,100 0
Commitments for expenditure remaining liability balances 37,100 0
Construction of Saeul Units (#3,4)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 11,718,217 9,800,424
Commitments for expenditure remaining liability balances 1,748,342 1,113,349
Construction of Shin-Hanul Units (#1,2)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts [1] 10,765,241 10,592,760
Commitments for expenditure remaining liability balances [1] 0 0
Construction of Shin-Hanul Units (#3,4)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 12,343,245 11,680,361
Commitments for expenditure remaining liability balances 10,964,638 10,935,737
Other 40 contracts    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 2,033,913 1,631,574
Commitments for expenditure remaining liability balances 1,744,217 1,133,467
Purchase of main equipment for Jeju LNG Combined    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 0 166,287
Commitments for expenditure remaining liability balances 0 0
Purchase of equipment for the construction project of Boryeong indoor coal storage yard    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 357,479 334,932
Commitments for expenditure remaining liability balances 241,751 279,920
Purchase of main machine for Boryeong New Complex Unit 1    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 286,299 281,600
Commitments for expenditure remaining liability balances 177,988 228,053
Boryeong New Complex Unit 1 Construction Project    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 202,552 186,358
Commitments for expenditure remaining liability balances 161,753 186,358
Haman Combined Power Block Conditional Purchase Agreement    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 581,790 0
Commitments for expenditure remaining liability balances 543,509 0
Service of designing Taean Units (#9,10)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 0 112,909
Commitments for expenditure remaining liability balances 0 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 123,495 123,495
Commitments for expenditure remaining liability balances 15,603 15,603
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 220,864 220,864
Commitments for expenditure remaining liability balances 101 214
Construction of Gimpo combined heat & power plant    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 223,660 211,372
Commitments for expenditure remaining liability balances 8,795 13,960
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 198,029 197,983
Commitments for expenditure remaining liability balances 29,417 193,578
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 65,918
Commitments for expenditure remaining liability balances 12,574 45,299
Construction of Gumi natural gas power plant    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 246,110 210,393
Commitments for expenditure remaining liability balances 96,708 173,350
Installation of natural gas supply facility at Gumi natural gas power plant    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 83,801 70,620
Commitments for expenditure remaining liability balances 45,019 61,799
Construction of Gongju natural gas power plant    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 203,849 0
Commitments for expenditure remaining liability balances 190,840 0
Purchase of natural gas main machine and accessories at Gongju natural gas power plant    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 305,829 0
Commitments for expenditure remaining liability balances 273,338 0
Purchase of coal handling machine for construction of Samcheok Units (#1,2)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 326,395 312,150
Commitments for expenditure remaining liability balances 5,905 5,682
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 0 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 2,670 8,342
Purchase of Hadong thermal power indoor carboniferous plant    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 167,259 167,259
Commitments for expenditure remaining liability balances 0 48,495
Purchase of phase 2 power generation facility for Yeongwol fuel cells    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 88,428 86,350
Commitments for expenditure remaining liability balances 0 219
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 82,395 81,960
Commitments for expenditure remaining liability balances 0 18,290
Purchase of Samcheok hydrogen compound co-firing facility infrastructure    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 128,820 0
Commitments for expenditure remaining liability balances 90,876 0
Construction of Andong Combined Unit 2 Power Plant    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 181,593 0
Commitments for expenditure remaining liability balances 175,029 0
Purchase of main equipment for Andong Combined Unit 2    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 279,773 0
Commitments for expenditure remaining liability balances 230,694 0
Service of designing Hadong Combined Unit 1    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 31,593 0
Commitments for expenditure remaining liability balances ₩ 26,351 ₩ 0
[1] As of December 31, 2024, the commitment amounts include the value of Shin-Hanul Unit #1, construction of which was completed during the year ended December 31, 2022. In addition, Shin-Hanul Unit #2 is in commercial operation as of December 31, 2024.