Regulatory Matters (Tables)

6 Months Ended

Jun. 30, 2024

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 June 30, 2024 and December 31, 2023 and the period we expect to recover or refund such amounts:


	Period of	June 30, 2024				December 31, 2023
(in thousands)	Recovery/Refund	Current		Long-Term		Current		Long-Term

Regulatory Assets
Pension and Other Postretirement Benefit Plans1	Various	$	154	$	86,057	$	154	$	86,134
Alternative Revenue Program Riders2	Up to 2 years	3,548		95		3,719		158
Deferred Income Taxes	Asset lives	—		7,187		—		6,940
Fuel Clause Adjustments1	Up to 1 year	1,663		—		7,294		—
Derivative Instruments1	Up to 2 years	1,516		462		4,210		—
Other1	Various	1,291		1,804		750		2,483
Total Regulatory Assets		$	8,172	$	95,605	$	16,127	$	95,715
Regulatory Liabilities
Deferred Income Taxes	Asset lives	$	—	$	133,412	$	—	$	136,022
Plant Removal Obligations	Asset lives	—		117,499		—		117,030
Fuel Clause Adjustments	Up to 1 year	24,055		—		11,350		—
Alternative Revenue Program Riders	Up to 1 year	13,879		—		6,885		—
North Dakota PTC Refunds	Asset lives	—		14,612		—		12,011
Pension and Other Postretirement Benefit Plans	Various	6,138		8,894		6,138		11,307



Other	Various	1,111		651		1,035		177
Total Regulatory Liabilities		$	45,183	$	275,068	$	25,408	$	276,547

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