Regulatory Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2024

Regulatory Assets and Liabilities Disclosure [Abstract]

Schedule of Regulatory Assets And Liabilities

	Note Reference	Remaining Amortization Period	December 31,
			2024		2023
			(in thousands)
Flow-through income taxes	12	Plant Lives	$	596,265	$	553,452
Pension	14	See Note 14	62,096		79,638
Excess deferred income taxes	12	Plant Lives	45,620		51,404
Employee related benefits	14	See Note 14	17,877		21,926
Deferred financing costs	11	See Note 11	17,754		20,028
Wildfire mitigation		Undetermined	17,368		1,623
Supply costs		1 Year	11,441		7,317
Environmental clean-up	18	Undetermined	11,257		11,131
State & local taxes & fees		1 Year	8,924		2,733
Other		Various	15,663		24,319
Total Regulatory Assets			$	804,265	$	773,571
Removal cost	6	Plant Lives	$	537,210	$	523,744
Excess deferred income taxes	12	Plant Lives	125,878		136,382
Supply costs		1 Year	20,933		19,691
Gas storage sales		15 years	6,205		6,625
State & local taxes & fees		1 Year	251		30,576
Other		Various	2,726		1,537
Total Regulatory Liabilities			$	693,203	$	718,555