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Borrowings and Debt Securities - Long-term Borrowings (Details)
€ in Thousands, ¥ in Thousands, JD in Thousands, $ in Thousands, $ in Thousands, ₩ in Millions
 12 Months Ended
Dec. 31, 2024
KRW (₩)
Dec. 31, 2023
KRW (₩)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
JOD (JD)
Dec. 31, 2024
JPY (¥)
Dec. 31, 2024
EUR (€)
Dec. 31, 2024
AUD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
JOD (JD)
Dec. 31, 2023
JPY (¥)
Dec. 31, 2023
EUR (€)
Dec. 31, 2023
AUD ($)
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings ₩ 11,588,197 ₩ 9,188,152                    
Less: Discount on long-term borrowings (51,608) (15,835)                    
Less: Current portion of long-term borrowings (8,434,330) (5,780,638)                    
Add: Current portion of discount on long-term borrowings 16,537 1,152                    
Long-term borrowings 3,118,796 3,392,831                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings ₩ 9,367,153 ₩ 7,304,875                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Korea Development Bank Korea Development Bank                    
Purpose of borrowings Others Others                    
Borrowings, interest rate 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%
Borrowings ₩ 1,424 ₩ 1,758                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, maturity 2025 2024                    
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, maturity 2044 2044                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Korea Development Bank Korea Development Bank                    
Purpose of borrowings Facility Facility                    
Borrowings ₩ 51,960 ₩ 53,052                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 2.60% 2.60% 2.60% 2.60% 2.60% 2.60% 2.60% 2.60% 2.60% 2.60% 2.60% 2.60%
Borrowings, maturity 2025 2025                    
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 4.94% 4.94% 4.94% 4.94% 4.94% 4.94% 4.94% 4.94% 4.94% 4.94% 4.94% 4.94%
Borrowings, maturity 2042 2042                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Korea Development Bank Korea Development Bank                    
Purpose of borrowings Facility Facility                    
Borrowings, interest rate basis CB rate CB rate                    
Borrowings, adjustment to interest rate basis 0.90% 0.90% 0.90% 0.90% 0.90% 0.90% 0.90% 0.90% 0.90% 0.90% 0.90% 0.90%
Borrowings, maturity 2029 2029                    
Borrowings ₩ 9,486 ₩ 9,985                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Hana Bank and others Korea Development Bank                    
Purpose of borrowings Commercial Paper Operating funds                    
Borrowings, interest rate basis 3M CD 1yr KDB                    
Borrowings, adjustment to interest rate basis   0.91%           0.91% 0.91% 0.91% 0.91% 0.91%
Borrowings, maturity   2024                    
Borrowings ₩ 7,550,000 ₩ 40,000                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis 0.31%   0.31% 0.31% 0.31% 0.31% 0.31%          
Borrowings, maturity 2025                      
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis 1.20%   1.20% 1.20% 1.20% 1.20% 1.20%          
Borrowings, maturity 2029                      
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Hana Bank and others Hana Bank and others                    
Purpose of borrowings Facility Commercial Paper                    
Borrowings, interest rate 4.60%   4.60% 4.60% 4.60% 4.60% 4.60%          
Borrowings, interest rate basis   3M CD                    
Borrowings, maturity 2028                      
Borrowings ₩ 4,904 ₩ 5,350,000                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis   0.13%           0.13% 0.13% 0.13% 0.13% 0.13%
Borrowings, maturity   2024                    
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis   1.20%           1.20% 1.20% 1.20% 1.20% 1.20%
Borrowings, maturity   2028                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Hana Bank and others Hana Bank and others                    
Purpose of borrowings Facility Facility                    
Borrowings, interest rate   4.60%           4.60% 4.60% 4.60% 4.60% 4.60%
Borrowings, interest rate basis 3yr KTB rate                      
Borrowings, adjustment to interest rate basis 1.25%   1.25% 1.25% 1.25% 1.25% 1.25%          
Borrowings, maturity 2028 2028                    
Borrowings ₩ 2,492 ₩ 6,558                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Export-Import Bank of Korea Hana Bank and others                    
Purpose of borrowings Project loans Facility                    
Borrowings, interest rate 1.00%   1.00% 1.00% 1.00% 1.00% 1.00%          
Borrowings, interest rate basis   3yr KTB rate                    
Borrowings, adjustment to interest rate basis   2.50%           2.50% 2.50% 2.50% 2.50% 2.50%
Borrowings, maturity 2026 2028                    
Borrowings ₩ 4,419 ₩ 3,156                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Export-Import Bank of Korea Export-Import Bank of Korea                    
Purpose of borrowings Facility Project loans                    
Borrowings, interest rate 1.32% 1.00% 1.32% 1.32% 1.32% 1.32% 1.32% 1.00% 1.00% 1.00% 1.00% 1.00%
Borrowings, maturity   2026                    
Borrowings ₩ 64,000 ₩ 7,365                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, maturity 2025                      
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, maturity 2028                      
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Export-Import Bank of Korea Export-Import Bank of Korea                    
Purpose of borrowings Operating funds Facility                    
Borrowings, interest rate   1.32%           1.32% 1.32% 1.32% 1.32% 1.32%
Borrowings, interest rate basis 3M bank debenture rate                      
Borrowings, adjustment to interest rate basis 0.66%   0.66% 0.66% 0.66% 0.66% 0.66%          
Borrowings, maturity 2026 2028                    
Borrowings ₩ 50,000 ₩ 80,000                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Korea Energy Agency Export-Import Bank of Korea                    
Purpose of borrowings Development of power resources Operating funds                    
Borrowings, interest rate 1.75%   1.75% 1.75% 1.75% 1.75% 1.75%          
Borrowings, interest rate basis 3yr KTB rate 3M Bank debenture rate                    
Borrowings, adjustment to interest rate basis 2.25% 0.66% 2.25% 2.25% 2.25% 2.25% 2.25% 0.66% 0.66% 0.66% 0.66% 0.66%
Borrowings, maturity   2026                    
Borrowings ₩ 7,494 ₩ 40,000                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, maturity 2025                      
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, maturity 2028                      
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Korea Energy Agency Korea Energy Agency                    
Purpose of borrowings Project loans Development of powerresources                    
Borrowings, interest rate   2.25%           2.25% 2.25% 2.25% 2.25% 2.25%
Borrowings, interest rate basis   3yr KTB rate                    
Borrowings, adjustment to interest rate basis   2.25%           2.25% 2.25% 2.25% 2.25% 2.25%
Borrowings, maturity 2033                      
Borrowings ₩ 1,197 ₩ 9,176                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, maturity   2024                    
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, maturity   2028                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Shinhan Bank and others Korea Energy Agency                    
Purpose of borrowings Facility Facility                    
Borrowings, interest rate basis CB rate 3yr KTB rate                    
Borrowings, adjustment to interest rate basis   1.50%           1.50% 1.50% 1.50% 1.50% 1.50%
Borrowings, maturity   2024                    
Borrowings ₩ 13,995 ₩ 163                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis 0.90%   0.90% 0.90% 0.90% 0.90% 0.90%          
Borrowings, maturity 2028                      
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis 1.10%   1.10% 1.10% 1.10% 1.10% 1.10%          
Borrowings, maturity 2029                      
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Shinhan Bank and others Korea Energy Agency                    
Purpose of borrowings Operating funds Project loans                    
Borrowings, interest rate basis 6M bank debenture rate —                    
Borrowings, maturity   2033                    
Borrowings ₩ 50,000 ₩ 1,197                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis 0.93%   0.93% 0.93% 0.93% 0.93% 0.93%          
Borrowings, maturity 2025                      
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis 1.03%   1.03% 1.03% 1.03% 1.03% 1.03%          
Borrowings, maturity 2027                      
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Shinhan Bank and others Shinhan Bank and others                    
Purpose of borrowings Others Facility                    
Borrowings, interest rate 3.95%   3.95% 3.95% 3.95% 3.95% 3.95%          
Borrowings, interest rate basis   CB rate                    
Borrowings, maturity 2034                      
Borrowings ₩ 67,733 ₩ 16,825                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis   0.90%           0.90% 0.90% 0.90% 0.90% 0.90%
Borrowings, maturity   2028                    
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis   1.10%           1.10% 1.10% 1.10% 1.10% 1.10%
Borrowings, maturity   2029                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Shinhan Bank and others Shinhan Bank and others                    
Purpose of borrowings Others Operating funds                    
Borrowings, interest rate basis Standard overdraft rate 6M Bank debenture rate                    
Borrowings, adjustment to interest rate basis 1.00% 0.93% 1.00% 1.00% 1.00% 1.00% 1.00% 0.93% 0.93% 0.93% 0.93% 0.93%
Borrowings, maturity 2034 2025                    
Borrowings ₩ 67,733 ₩ 20,000                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Kookmin Bank Shinhan Bank and others                    
Purpose of borrowings Facility Commercial Paper                    
Borrowings, interest rate basis 3M CD 3M CD                    
Borrowings, adjustment to interest rate basis 1.79% 0.38% 1.79% 1.79% 1.79% 1.79% 1.79% 0.38% 0.38% 0.38% 0.38% 0.38%
Borrowings, maturity   2025                    
Borrowings ₩ 167,945 ₩ 150,000                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis 5.53%   5.53% 5.53% 5.53% 5.53% 5.53%          
Borrowings, maturity 2030                      
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis 5.63%   5.63% 5.63% 5.63% 5.63% 5.63%          
Borrowings, maturity 2037                      
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Kookmin Bank Shinhan Bank and others                    
Purpose of borrowings Operating funds Others                    
Borrowings, interest rate   3.95%           3.95% 3.95% 3.95% 3.95% 3.95%
Borrowings, interest rate basis 1yr bank debenture rate                      
Borrowings, adjustment to interest rate basis 0.78%   0.78% 0.78% 0.78% 0.78% 0.78%          
Borrowings, maturity 2025 2034                    
Borrowings ₩ 20,000 ₩ 73,425                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Woori Bank Shinhan Bank and others                    
Purpose of borrowings Facility Others                    
Borrowings, interest rate basis 3M CD Standard overdraft rate                    
Borrowings, adjustment to interest rate basis 1.90% 1.00% 1.90% 1.90% 1.90% 1.90% 1.90% 1.00% 1.00% 1.00% 1.00% 1.00%
Borrowings, maturity   2034                    
Borrowings ₩ 100,071 ₩ 73,425                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 5.12%   5.12% 5.12% 5.12% 5.12% 5.12%          
Borrowings, maturity 2034                      
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 5.61%   5.61% 5.61% 5.61% 5.61% 5.61%          
Borrowings, maturity 2042                      
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor IBK Kookmin Bank                    
Purpose of borrowings Facility Facility                    
Borrowings, interest rate   5.04%           5.04% 5.04% 5.04% 5.04% 5.04%
Borrowings, interest rate basis   1yr Bank debenture rate                    
Borrowings, interest rate basis   3M CD                    
Borrowings, adjustment to interest rate basis   0.78%           0.78% 0.78% 0.78% 0.78% 0.78%
Borrowings ₩ 30,690 ₩ 186,032                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 4.00%   4.00% 4.00% 4.00% 4.00% 4.00%          
Borrowings, adjustment to interest rate basis   1.79%           1.79% 1.79% 1.79% 1.79% 1.79%
Borrowings, maturity 2042 2025                    
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 5.80%   5.80% 5.80% 5.80% 5.80% 5.80%          
Borrowings, adjustment to interest rate basis   2.10%           2.10% 2.10% 2.10% 2.10% 2.10%
Borrowings, maturity 2044 2037                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Nonghyup Bank Woori Bank                    
Purpose of borrowings Facility Facility                    
Borrowings, interest rate   5.04%           5.04% 5.04% 5.04% 5.04% 5.04%
Borrowings, interest rate basis   Standard overdraft rate                    
Borrowings, interest rate basis   3M CD                    
Borrowings, adjustment to interest rate basis   1.60%           1.60% 1.60% 1.60% 1.60% 1.60%
Borrowings, adjustment to interest rate basis   1.90%           1.90% 1.90% 1.90% 1.90% 1.90%
Borrowings ₩ 36,351 ₩ 101,172                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 5.53%   5.53% 5.53% 5.53% 5.53% 5.53%          
Borrowings, maturity 2030 2034                    
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 5.63%   5.63% 5.63% 5.63% 5.63% 5.63%          
Borrowings, maturity 2041 2042                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Others IBK                    
Purpose of borrowings Facility Facility                    
Borrowings ₩ 801,687 ₩ 30,690                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 3.30% 4.00% 3.30% 3.30% 3.30% 3.30% 3.30% 4.00% 4.00% 4.00% 4.00% 4.00%
Borrowings, maturity 2028 2042                    
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 6.80% 5.80% 6.80% 6.80% 6.80% 6.80% 6.80% 5.80% 5.80% 5.80% 5.80% 5.80%
Borrowings, maturity 2042 2044                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Others Nonghyup Bank                    
Purpose of borrowings Facility Facility                    
Borrowings, interest rate basis CB rate 3M CD                    
Borrowings, adjustment to interest rate basis 1.10%   1.10% 1.10% 1.10% 1.10% 1.10%          
Borrowings ₩ 24,517 ₩ 22,517                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis 2.25% 2.00% 2.25% 2.25% 2.25% 2.25% 2.25% 2.00% 2.00% 2.00% 2.00% 2.00%
Borrowings, maturity 2028 2030                    
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis 5.63% 2.10% 5.63% 5.63% 5.63% 5.63% 5.63% 2.10% 2.10% 2.10% 2.10% 2.10%
Borrowings, maturity 2041 2041                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Others Others                    
Purpose of borrowings PF Refinancing Facility                    
Borrowings, interest rate basis CB rate                      
Borrowings, adjustment to interest rate basis 1.25%   1.25% 1.25% 1.25% 1.25% 1.25%          
Borrowings, maturity 2030                      
Borrowings ₩ 5,726 ₩ 735,722                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate   3.50%           3.50% 3.50% 3.50% 3.50% 3.50%
Borrowings, maturity   2028                    
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate   6.80%           6.80% 6.80% 6.80% 6.80% 6.80%
Borrowings, maturity   2042                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Others Others                    
Purpose of borrowings PF Refinancing Facility                    
Borrowings, interest rate 4.10%   4.10% 4.10% 4.10% 4.10% 4.10%          
Borrowings, interest rate basis   CB rate                    
Borrowings, interest rate basis   3M CD                    
Borrowings, adjustment to interest rate basis   1.10%           1.10% 1.10% 1.10% 1.10% 1.10%
Borrowings, adjustment to interest rate basis   2.10%           2.10% 2.10% 2.10% 2.10% 2.10%
Borrowings, maturity 2030                      
Borrowings ₩ 15,905 ₩ 51,509                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate   1.75%           1.75% 1.75% 1.75% 1.75% 1.75%
Borrowings, maturity   2024                    
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate   3.30%           3.30% 3.30% 3.30% 3.30% 3.30%
Borrowings, maturity   2041                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Others Others                    
Purpose of borrowings Securitized debts (*) PF Refinancing                    
Borrowings, interest rate basis 3M CD CB rate                    
Borrowings, adjustment to interest rate basis 1.80% 1.25% 1.80% 1.80% 1.80% 1.80% 1.80% 1.25% 1.25% 1.25% 1.25% 1.25%
Borrowings, maturity 2025 2030                    
Borrowings ₩ 54,236 ₩ 6,680                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Others Others                    
Purpose of borrowings Others PF Refinancing                    
Borrowings, interest rate   4.10%           4.10% 4.10% 4.10% 4.10% 4.10%
Borrowings, maturity   2030                    
Borrowings ₩ 113,362 ₩ 18,556                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 4.40%   4.40% 4.40% 4.40% 4.40% 4.40%          
Borrowings, maturity 2025                      
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 7.90%   7.90% 7.90% 7.90% 7.90% 7.90%          
Borrowings, maturity 2039                      
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Others Others                    
Purpose of borrowings Others Securitized debts                    
Borrowings, interest rate basis   3M CD                    
Borrowings, adjustment to interest rate basis   1.80%           1.80% 1.80% 1.80% 1.80% 1.80%
Borrowings, maturity   2025                    
Borrowings ₩ 49,826 ₩ 52,060                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 2.00%   2.00% 2.00% 2.00% 2.00% 2.00%          
Borrowings, maturity 2031                      
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 6.15%   6.15% 6.15% 6.15% 6.15% 6.15%          
Borrowings, maturity 2034                      
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor   Others                    
Purpose of borrowings   Others                    
Borrowings   ₩ 113,973                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate   4.40%           4.40% 4.40% 4.40% 4.40% 4.40%
Borrowings, maturity   2025                    
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate   7.90%           7.90% 7.90% 7.90% 7.90% 7.90%
Borrowings, maturity   2039                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor   Others                    
Purpose of borrowings   Others                    
Borrowings   ₩ 49,879                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate   1.80%           1.80% 1.80% 1.80% 1.80% 1.80%
Borrowings, maturity   2031                    
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate   4.50%           4.50% 4.50% 4.50% 4.50% 4.50%
Borrowings, maturity   2034                    
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings ₩ 2,221,044 ₩ 1,883,277                    
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Korea Energy Agency Korea Energy Agency                    
Purpose of borrowings Project loans Project loans                    
Borrowings, interest rate basis   —                    
Borrowings, maturity 2026 2026                    
Borrowings ₩ 12,853 ₩ 11,274 $ 8,744         $ 8,744        
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Export-Import Bank of Korea and others Export-Import Bank of Korea and others                    
Purpose of borrowings Direct Loan and others Direct Loan and others                    
Borrowings, interest rate basis 6M Synthetic Libor 6M Synthetic Libor                    
Borrowings, maturity 2036 2036                    
Borrowings ₩ 106,080 ₩ 101,020 $ 72,163         $ 78,347        
Foreign long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis 1.80% 1.80% 1.80% 1.80% 1.80% 1.80% 1.80% 1.80% 1.80% 1.80% 1.80% 1.80%
Foreign long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis 3.20% 3.20% 3.20% 3.20% 3.20% 3.20% 3.20% 3.20% 3.20% 3.20% 3.20% 3.20%
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Export-Import Bank of Korea and others Export-Import Bank of Korea and others                    
Purpose of borrowings Direct Loan and others Direct Loan and others                    
Borrowings, interest rate basis 6M Synthetic Libor 6M Synthetic Libor                    
Borrowings, maturity 2027 2027                    
Borrowings ₩ 91,437 ₩ 113,390   JD 44,126         JD 62,385      
Foreign long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis 2.25% 2.25% 2.25% 2.25% 2.25% 2.25% 2.25% 2.25% 2.25% 2.25% 2.25% 2.25%
Foreign long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis 3.70% 3.70% 3.70% 3.70% 3.70% 3.70% 3.70% 3.70% 3.70% 3.70% 3.70% 3.70%
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Export-Import Bank of Korea and others Export-Import Bank of Korea and others                    
Purpose of borrowings Facility Facility                    
Borrowings, interest rate basis SOFR 6M Synthetic Libor                    
Borrowings, interest rate basis SOFR(1M) SOFR(1M)                    
Borrowings, adjustment to interest rate basis 0.43% 1.83% 0.43% 0.43% 0.43% 0.43% 0.43% 1.83% 1.83% 1.83% 1.83% 1.83%
Borrowings, adjustment to interest rate basis 1.83%   1.83% 1.83% 1.83% 1.83% 1.83%          
Borrowings ₩ 165,628 ₩ 155,909 $ 112,672         $ 120,916        
Foreign long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis   1.70%           1.70% 1.70% 1.70% 1.70% 1.70%
Borrowings, maturity 2029 2029                    
Foreign long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis   2.50%           2.50% 2.50% 2.50% 2.50% 2.50%
Borrowings, maturity 2031 2031                    
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Korea Development Bank and others Korea Development Bank and others                    
Purpose of borrowings EBL EBL                    
Borrowings, interest rate basis SOFR(1M) SOFR(1M)                    
Borrowings, adjustment to interest rate basis 0.86% 0.86% 0.86% 0.86% 0.86% 0.86% 0.86% 0.86% 0.86% 0.86% 0.86% 0.86%
Borrowings, maturity 2025 2025                    
Borrowings ₩ 219,900 ₩ 183,157 $ 149,592         $ 142,049        
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor POSCO E&C and others POSCO E&C and others                    
Purpose of borrowings Shareholder’s loan Shareholder’s loan                    
Borrowings, maturity   2025                    
Borrowings ₩ 14,914 ₩ 13,887 $ 10,145         $ 10,770        
Foreign long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 5.60% 5.60% 5.60% 5.60% 5.60% 5.60% 5.60% 5.60% 5.60% 5.60% 5.60% 5.60%
Borrowings, maturity 2025                      
Foreign long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%
Borrowings, maturity 2026                      
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor POSCO E&C and others POSCO E&C and others                    
Purpose of borrowings Shareholder’s loan Shareholder’s loan                    
Borrowings, interest rate 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%
Borrowings, maturity 2031 2031                    
Borrowings ₩ 10,056 ₩ 9,850   JD 4,853         JD 5,419      
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Samsung Life Insurance and others Samsung Life Insurance and others                    
Purpose of borrowings Syndicated Loan Syndicated Loan                    
Borrowings, maturity   2032                    
Borrowings ₩ 36,878 ₩ 39,707     ¥ 3,937,987         ¥ 4,350,671    
Foreign long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 3.10% 3.10% 3.10% 3.10% 3.10% 3.10% 3.10% 3.10% 3.10% 3.10% 3.10% 3.10%
Borrowings, maturity 2025                      
Foreign long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%
Borrowings, maturity 2032                      
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Woori Bank and others Woori Bank and others                    
Purpose of borrowings Syndicated Loan Syndicated Loan                    
Borrowings, interest rate basis JPY 6M Tibor JPY 6M Tibor                    
Borrowings, adjustment to interest rate basis 1.84% 1.84% 1.84% 1.84% 1.84% 1.84% 1.84% 1.84% 1.84% 1.84% 1.84% 1.84%
Borrowings, maturity 2025 2032                    
Borrowings ₩ 20,397 ₩ 21,896     ¥ 2,178,069         ¥ 2,399,088    
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Solar Construction Lending, LLC Solar Construction Lending, LLC                    
Purpose of borrowings Facility Facility                    
Borrowings, interest rate 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%
Borrowings, maturity 2025 2025                    
Borrowings ₩ 41,605 ₩ 38,545 $ 28,303         $ 29,894        
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Kiwoom Solar Power Professional Investor Private Placement Investment Trust V Kiwoom Solar Power Professional Investor Private Placement Investment Trust V                    
Purpose of borrowings Senior borrowing Senior borrowing                    
Borrowings, interest rate 3.90% 3.90% 3.90% 3.90% 3.90% 3.90% 3.90% 3.90% 3.90% 3.90% 3.90% 3.90%
Borrowings, maturity 2029 2029                    
Borrowings ₩ 58,304 ₩ 57,745       € 38,139         € 40,478  
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor IFC and others IFC and others                    
Purpose of borrowings Facility Facility                    
Borrowings, interest rate basis SOFR(3M) SOFR(3M)                    
Borrowings, interest rate basis SOFR(6M) SOFR(6M)                    
Borrowings, interest rate basis   3M BSBY                    
Borrowings, adjustment to interest rate basis   1.99%           1.99% 1.99% 1.99% 1.99% 1.99%
Borrowings, adjustment to interest rate basis 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%
Borrowings, adjustment to interest rate basis   1.70%           1.70% 1.70% 1.70% 1.70% 1.70%
Borrowings ₩ 1,136,092 ₩ 845,746 $ 772,852         $ 655,922        
Foreign long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 6.19% 6.05% 6.19% 6.19% 6.19% 6.19% 6.19% 6.05% 6.05% 6.05% 6.05% 6.05%
Borrowings, adjustment to interest rate basis 1.60%   1.60% 1.60% 1.60% 1.60% 1.60%          
Borrowings, maturity 2026 2024                    
Foreign long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 7.22% 6.62% 7.22% 7.22% 7.22% 7.22% 7.22% 6.62% 6.62% 6.62% 6.62% 6.62%
Borrowings, adjustment to interest rate basis 1.99%   1.99% 1.99% 1.99% 1.99% 1.99%          
Borrowings, maturity 2032 2031                    
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Hanwha US Solar Private Fund 1 and others Hanwha US Solar Private Fund 1 and others                    
Purpose of borrowings Facility Facility                    
Borrowings, interest rate 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%
Borrowings, maturity 2038 2039                    
Borrowings ₩ 89,292 ₩ 78,233 $ 60,743         $ 60,674        
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor DBS Bank and others DBS Bank and others                    
Purpose of borrowings Facility Facility                    
Borrowings, interest rate basis 1M BBSY 1M BBSY                    
Borrowings, maturity 2025 2025                    
Borrowings ₩ 163,301 ₩ 162,891         $ 178,729         $ 185,086
Foreign long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis 1.40% 1.40% 1.40% 1.40% 1.40% 1.40% 1.40% 1.40% 1.40% 1.40% 1.40% 1.40%
Foreign long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis 2.25% 2.25% 2.25% 2.25% 2.25% 2.25% 2.25% 2.25% 2.25% 2.25% 2.25% 2.25%
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Nonghyup Bank and others Nonghyup Bank and others                    
Purpose of borrowings Facility Facility                    
Borrowings, interest rate 10.40% 10.40% 10.40% 10.40% 10.40% 10.40% 10.40% 10.40% 10.40% 10.40% 10.40% 10.40%
Borrowings, maturity 2039 2039                    
Borrowings ₩ 54,307 ₩ 50,027 $ 36,943         $ 38,799