Regulatory Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2022

Regulatory Assets and Liabilities Disclosure [Abstract]

Schedule of Regulatory Assets and Liabilities [Table Text Block]

Our regulatory assets and liabilities result from our application of the provisions of Topic 980 and are reflected on our Balance Sheet. These balances are presented on our Balance Sheet on a gross basis and are recoverable or refundable over various periods. Below are the details of our regulatory assets and liabilities:

	December 31,
	2022		2021
	(Thousands)
Current regulatory assets:
Fuel recovery	$	11,871	$	107
Levelized depreciation	1,694		1,251
Total current regulatory assets	13,565		1,358
Non-current regulatory assets:
Levelized depreciation	11,601		13,581
Grossed-up deferred taxes on equity funds used during construction	4,350		4,731
Total non-current regulatory assets	15,951		18,312
Total regulatory assets	$	29,516	$	19,670
Current regulatory liabilities:
Customer tax refund	$	125,506	$	—
Deferred federal taxes - liability	18,643		—
Deferred state taxes - liability	1,094		—
Fuel recovery	—		158
Total current regulatory liabilities	145,243		158
Non-current regulatory liabilities:
Deferred federal taxes - liability	187,883		206,527
Postretirement benefits	42,207		40,980
Asset retirement obligations, net	30,590		26,747
Deferred state taxes - liability	11,026		12,120
Customer tax refund	—		102,059
Total non-current regulatory liabilities	271,706		388,433
Total regulatory liabilities	$	416,949	$	388,591