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Debt - Maturities for long-term debt and finance lease obligations and debt outstanding (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Maturities for finance leases    
2022 $ 14,949  
2023 14,949  
2024 14,949  
2025 14,949  
2026 14,949  
Maturities for contractual obligations    
2022 281,237  
2023 402,155  
2024 360,892  
2025 327,281  
2026 308,123  
Long-term debt outstanding and the associated unamortized debt issuance costs and debt discounts    
Principal 10,915,054 $ 10,619,826
Long-term debt    
Maturities for long-term debt    
2022 273,696  
2023 393,757  
2024 351,541  
2025 316,868  
2026 $ 296,528  
Weighted average interest rate on long-term debt 3.69% 3.73%
Long-term debt outstanding and the associated unamortized debt issuance costs and debt discounts    
Principal $ 10,915,054 $ 10,619,826
Unamortized Debt Issuance Costs and Debt Discounts 111,909 119,565
Finance Leases    
Maturities for finance leases    
2022 7,541  
2023 8,398  
2024 9,351  
2025 10,413  
2026 11,595  
FFB | Long-term debt    
Maturities for long-term debt    
2022 272,686  
2023 270,127  
2024 288,031  
2025 254,368  
2026 234,028  
Long-term debt outstanding and the associated unamortized debt issuance costs and debt discounts    
Principal 6,526,858 5,985,015
Unamortized Debt Issuance Costs and Debt Discounts 55,159 57,971
FMBs | Long-term debt    
Maturities for long-term debt    
2022 1,010  
2023 1,010  
2024 63,510  
2025 62,500  
2026 62,500  
Long-term debt outstanding and the associated unamortized debt issuance costs and debt discounts    
Principal 3,653,031 3,654,041
Unamortized Debt Issuance Costs and Debt Discounts 46,985 49,134
PCBs | Long-term debt    
Maturities for long-term debt    
2022 0  
2023 122,620  
2024 0  
2025 0  
2026 0  
Long-term debt outstanding and the associated unamortized debt issuance costs and debt discounts    
Principal 735,165 980,770
Unamortized Debt Issuance Costs and Debt Discounts 9,765 12,460
First mortgage notes issued in connection with the sale of pollution control revenue bonds: Series 2017 A Burke, Heard, Monroe and 2017B Burke, Indexed put bonds - weekly reset, 1.2% due 2040 through 2045 | Georgia Development Authorities    
Long-term debt outstanding and the associated unamortized debt issuance costs and debt discounts    
Series 2017 bonds, total outstanding $ 122,620 $ 122,620