Commitments (Tables)

12 Months Ended

Dec. 31, 2019

Commitments and Contingencies Disclosure [Abstract]

Schedule of estimated commitments

As of December 31, 2019, our estimated commitments are as follows:

	(dollars in thousands)
	Coal		Nuclear Fuel		Gas Transportation		Maintenance Agreements		Asset Retirement Obligations		Finance and Operating Leases
2020	$	13,019	$	55,300	$	63,985	$	53,911	$	6,623	$	16,348
2021	5,231		36,200		63,444		14,461		19,206		15,744
2022	2,524		31,200		53,643		14,929		33,742		15,554
2023	—		18,400		49,044		3,330		32,932		15,333
2024	—		20,800		46,686		29,750		42,504		15,021
Thereafter	—		14,300		798,660		218,456		3,453,280		56,617