Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2022

Regulatory Assets and Liabilities Disclosure [Abstract]

Schedule of Regulatory Assets and Liabilities

The following presents our current and long-term regulatory assets and liabilities as of December 31, 2022 and 2021 and the period we expect to recover or refund such amounts:


	Period of	2022				2021
(in thousands)	Recovery/Refund	Current		Long-Term		Current		Long-Term

Regulatory Assets
Pension and Other Postretirement Benefit Plans1	See below	$	—	$	88,354	$	7,791	$	114,961
Alternative Revenue Program Riders2	Up to 2 years	5,679		2,508		11,889		5,564
Asset Retirement Obligations1	Asset lives	—		1,467		—		742

ISO Cost Recovery Trackers1	Up to 2 years	575		314		—		1,342
Unrecovered Project Costs1	Up to 5 years	320		990		2,136		1,455
Deferred Rate Case Expenses1	Up to 2 years	377		754		607		1,131
Debt Reacquisition Premiums1	Up to 10 years	25		216		100		240
Fuel Clause Adjustments1	Up to 1 year	10,893		—		4,819		—
Derivative Instruments1	Up to 1 year	7,130		—		—		—
Other1	Various	—		52		—		73
Total Regulatory Assets		24,999		94,655		27,342		125,508
Regulatory Liabilities
Deferred Income Taxes	Asset lives	—		131,480		—		129,437
Plant Removal Obligations	Asset lives	8,509		105,733		8,306		101,595
Fuel Clause Adjustments	Up to 1 year	365		—		1,554		—
Alternative Revenue Program Riders	Various	2,504		7,136		5,772		3,336
Pension and Other Postretirement Benefit Plans	Up to 1 year	5,589		—		2,603		—

Derivative Instruments	Up to 1 year	—		—		6,214		—

Other	Various	333		148		395		62
Total Regulatory Liabilities		$	17,300	$	244,497	$	24,844	$	234,430

1Costs subject to recovery without a rate of return.
2Amount eligible for recovery includes an incentive or rate of return.