Commitments (Tables)

12 Months Ended

Dec. 31, 2020

Commitments and Contingencies Disclosure [Abstract]

Schedule of estimated commitments

As of December 31, 2020, our estimated commitments are as follows:

	(dollars in thousands)
	Coal		Nuclear Fuel		Gas Transportation		Maintenance Agreements		Asset Retirement Obligations		Finance and Operating Leases
2021	$	5,168	$	73,500	$	63,385	$	14,429	$	17,821	$	16,068
2022	3,017		33,060		53,268		14,896		31,780		15,878
2023	—		17,340		48,707		3,325		34,372		15,657
2024	—		22,650		48,034		30,316		41,840		15,183
2025	—		11,250		46,350		43,212		74,077		15,021
Thereafter	—		15,930		746,160		176,751		3,400,140		41,595