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Commitments (Tables)
12 Months Ended
Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]  
Schedule of estimated commitments As of December 31, 2022, our estimated commitments are as follows:
(dollars in thousands)
CoalNuclear FuelGas
Transportation
Maintenance
Agreements
Asset
Retirement
Obligations
Finance and Operating Leases
2023$26,891 $78,780 $63,850 $29,720 $16,709 $16,273 
202426,070 39,690 62,818 57,749 52,003 15,799 
202510,426 32,280 62,775 43,025 46,128 15,590 
2026— 28,980 68,872 15,736 49,445 15,299 
2027— 26,580 67,188 3,237 67,384 15,021 
Thereafter— 67,170 824,627 316,160 3,416,582 11,551