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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
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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 | ₩ 57,226
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.

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