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Hybrid bond (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 07, 2024
Dec. 31, 2023
Hybrid Bond [Line Items]      
Amount ₩ 229,373   ₩ 229,373
Korea South-East Power Co., Ltd. | 2nd hybrid bond      
Hybrid Bond [Line Items]      
Issue date [1] Dec. 07, 2012    
Maturity date [1] Dec. 06, 2042    
Yield (%) [1] 5.10%    
Amount [1] ₩ 230,000   ₩ 230,000
Hybrid bonds, repayment term 12 years    
Options interest rate   5.10% 4.44%
Expense of issuance      
Hybrid Bond [Line Items]      
Amount ₩ (627)   ₩ (627)
[1] Bondholders may not require prepayment in any case, and the Company has a call option to repay all of these bonds on or after 12 years from the date of issuance of the bonds, or on each interest payment date henceforth. In addition, there is a step-up clause from the date of the initial call option exercise. Although these instruments have contractual maturity dates, the contractual agreements allow the Company to indefinitely extend the maturity dates and defer the payment of interest without modification to the other terms of the instruments. When the Company decides not to pay dividends on common shares, they are not required to pay interest on the hybrid bonds. From December 7, 2024, the date when the call option become exercisable for the first time, the interest rate has increased from 4.44% to 5.10% due to the application of the step-up provision.