Income Taxes (Tables)

12 Months Ended

Dec. 31, 2025

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense

The components of income tax expense were:

	2025		2024	2023
Current:
Federal	$	5,276	(1,828)	10,185
State	1,896		443	4,281
Deferred:
Federal	5,360		11,063	(8,871)
State	(177)		(708)	361
	$	12,355	8,970	5,956

Schedule of Effective Income Tax Rate Reconciliation

The following table reconciles income tax expense to the amount computed by applying the federal statutory rate to income before income taxes of $114,933, $102,937 and $90,943 in 2025, 2024 and 2023, respectively:

	2025 (a)				2024	2023
Income tax at federal statutory rate	$	24,136	21.0	%	21,617	19,098
Increase (decrease) in taxes attributable to:
State and local income taxes, net of federal income tax effect (b)	1,326		1.2	%	6,488	6,001
Tax credits	(208)		(0.2)	%	—	—
Nontaxable or nondeductible items	543		0.5	%	—	—
Changes in unrecognized tax benefits	331		0.3	%	(1,053)	(4,330)
Property flow-through	—		—	%	(14,793)	(9,045)
Pension flow-through	—		—	%	(530)	(597)
Stock-based compensation	—		—	%	192	(491)
Other adjustments:
Impact of rate regulation
Flow-through	(11,933)		(10.4)	%	—	—
Reversal of excess deferred taxes recognized in regulatory liability	(1,517)		(1.3)	%	(3,227)	(3,625)
Other items	(323)		(0.3)	%	276	(1,055)
	$	12,355	10.8	%	8,970	5,956

(a)ASU 2023-09 “Improvements to Income Tax Disclosures” was adopted prospectively with the annual financial statements for the year ended December 31, 2025. Accordingly, the table above was updated for the year ended December 31, 2025 to present disclosures as per the new ASU.

(b)Majority of the tax expense reported in this category relates to California. State flow-through adjustments are included in this category for the year ended December 31, 2025.

Schedule of Deferred Tax Assets and Liabilities

The components of the net deferred tax liability as of December 31 were as follows:

	2025		2024
Deferred tax assets:
Advances and contributions	$	28,183	26,744
Unamortized investment tax credit	1,141		1,061
Pensions, postretirement benefits and stock-based compensation	11,749		12,529
Debt premium, net	2,734		3,446
California franchise tax	257		503
Deferred revenue	—		—
Tax related regulatory liability	22,572		23,112
Other	9,560		6,337
Total deferred tax assets	76,196		73,732
Deferred tax liabilities:
Utility plant	304,002		277,085
Pension and postretirement	9,272		9,068
Deferred gain and other-property	608		608
Regulatory asset - business combinations debt premium, net	2,734		3,446
Intangibles	2,193		2,443
Deferred revenue	2,330		1,418
Tax related regulatory asset	57,503		50,728
Other	5,447		4,979
Total deferred tax liabilities	384,089		349,775
Net deferred tax liabilities	$	307,893	276,043

Schedule of Unrecognized Tax Benefits Roll Forward

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:

	2025		2024	2023
Balance at beginning of year	$	3,707	4,511	9,004
Increase related to tax positions taken during the current year	663		658	231
Increase related to tax positions taken during a prior year	113		380	364
Reductions related to statute expiration	(389)		(1,701)	(1,191)
Reductions related to tax positions taken in a prior year	—		(141)	(3,897)
Balance at end of year	$	4,094	3,707	4,511

Schedule of Income Taxes Paid (Net of Refunds)

Income Taxes paid (net of refunds) for the year ending December 31, 2025 were as below:

	2025
Federal	$	2,000
State	1,238
Foreign	—
Total	$	3,238

Income Taxes paid (net of refunds) exceeded 5% of total income taxes paid (net of refunds) in the following jurisdictions:

State:	2025
California	$	400
Connecticut	521
Maine	*
Tennessee	219
Texas	*
Total	$	1,140

*Jurisdiction below the threshold for the period presented