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v3.25.1

Investments in Associates (Parenthetical) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Disclosure of joint ventures [line items] |  |  |  |
Effective percentage of ownership | 20.00% |  |  |
UD4M Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Effective percentage of ownership | 14.29% | [1] | 14.29% | [2]
Percentage of ownership interest including holding in treasury stock | 14.29% |  | 14.29% |
Saemangeum Sebit Power Plant Co., Ltd. [Member] |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Effective percentage of ownership | 55.00% | [1] | 55.00% | [2]
Environment and Energy Co., Ltd |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Effective percentage of ownership | 10.54% | [1] | 10.54% | [2]
Korea Gas Corporation |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Effective percentage of ownership | 21.66% |  |  |
Korea Power Exchange [Member] |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Effective percentage of ownership | 100.00% |  | 100.00% |
Samcheok Eco Materials Co., Ltd. [Member] |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Nominal percentage of ownership associate |  |  | 2.35% |
Dongducheon Dream Power [Member] |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Effective percentage of ownership | 34.01% |  | 34.01% |
Bottom of range [member] | Saemangeum Sebit Power Plant Co., Ltd. [Member] |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Effective percentage of ownership | 50.00% |  | 50.00% |
Bottom of range [member] | Korea Electric Power Corporation Fund [Member] |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Effective percentage of ownership | 50.00% |  | 50.00% |
Bottom of range [member] | Nepal Water Energy Development Company Private Limited [Member] |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Effective percentage of ownership | 50.00% |  | 50.00% |
Top of range [member] | UD4M Co., Ltd. |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Effective percentage of ownership |  |  | 20.00% |
Top of range [member] | Environment and Energy Co., Ltd |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Effective percentage of ownership | 20.00% |  | 20.00% |
Top of range [member] | Gangwon Wind Power Co., Ltd. [Member] |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Effective percentage of ownership | 20.00% |  | 20.00% |
Top of range [member] | KNOC Nigerian East Oil [Member] |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Effective percentage of ownership | 20.00% |  | 20.00% |
Top of range [member] | Samcheok Eco Materials Co., Ltd. [Member] |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Effective percentage of ownership |  |  | 25.54% |
Top of range [member] | Namjeongsusang Solar Power Operation Co., Ltd. [Member] |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |
Effective percentage of ownership | 20.00% |  | 20.00% |
[1] | The percentage of ownership shown above is an effective percentage of ownership including the treasury stocks and others.
[2] | The percentage of ownership shown above is after considering the treasury stocks and others.

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