CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Cash Flows From Operating Activities:
Net Income	$ 130,442	$ 119,268	$ 124,921
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	48,873	44,226	43,254
Provision for doubtful accounts	2,350	1,653	932
Deferred income taxes and investment tax credits	3,600	2,042	4,783
Stock-based compensation expense	3,559	3,744	3,298
(Gain) loss on investments held in a trust	(5,511)	(5,293)	(5,008)
Other — net	(414)	187	289
Changes in assets and liabilities:
Accounts receivable — customers	(2,978)	(5,110)	(6,632)
Unbilled receivable	3,991	(3,468)	(1,283)
Other receivables	312	(369)	(2,241)
Unbilled receivable	2,426	15,003	(6,033)
Materials and supplies	(1,266)	2,434	(2,951)
Prepayments and other assets	1,379	32	1,581
Contract assets	(9,859)	(7,270)	604
Regulatory assets/liabilities	46,124	18,487	(81,373)
Accounts payable	7,582	5,152	(10,862)
Income taxes receivable/payable	753	(24)	2,493
Contract liabilities	6,073	4,310	449
Accrued pension and other post-retirement benefits	(1,954)	(208)	1,046
Other liabilities	(5,752)	3,936	416
Net cash provided (used)	229,730	198,732	67,683
Cash Flows From Investing Activities:
Capital expenditures	(236,822)	(231,960)	(188,540)
Other investing activities	(719)	(820)	(224)
Net cash provided (used)	(237,541)	(232,780)	(188,764)
Cash Flows From Financing Activities:
Proceeds from Issuance of Common Shares, net of issuance costs	67,061	88,814	0
Receipt of advances for and contributions in aid of construction	13,981	11,195	11,889
Refunds on advances for construction	(5,833)	(4,919)	(4,540)
Repayments of long-term debt	(454)	(370)	(334)
Proceeds from the issuance of long-term debt, net of issuance costs	149,206	64,569	129,665
Net changes in notes payable to banks	(148,000)	(44,500)	54,590
Dividends paid	(74,658)	(67,017)	(61,195)
Other financing activities	(1,329)	(1,136)	(918)
Net cash provided (used)	(26)	46,636	129,157
Net change in cash and cash equivalents	(7,837)	12,588	8,076
Cash and cash equivalents, beginning of year	26,661	14,073	5,997
Cash and cash equivalents, end of year	18,824	26,661	14,073
GSWC
Cash Flows From Operating Activities:
Net Income	100,946	94,463	102,708
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	41,342	37,738	36,623
Provision for doubtful accounts	1,817	1,310	754
Deferred income taxes and investment tax credits	1,928	2,748	2,949
Stock-based compensation expense	3,131	3,279	2,994
(Gain) loss on investments held in a trust	(5,511)	(5,293)	(5,008)
Other — net	89	240	106
Changes in assets and liabilities:
Accounts receivable — customers	(317)	(5,004)	(6,321)
Unbilled receivable	(1,190)	(2,232)	(2,179)
Other receivables	373	877	(1,484)
Materials and supplies	(1,584)	(163)	(1,260)
Prepayments and other assets	1,164	595	1,838
Regulatory assets/liabilities	47,792	24,386	(74,378)
Accounts payable	4,455	4,617	(5,420)
Income taxes receivable/payable	698	(3,031)	1,470
Receivable/payable from/to affiliate	(1,268)	260	248
Accrued pension and other post-retirement benefits	(2,089)	(315)	979
Other liabilities	(8,468)	4,134	(278)
Net cash provided (used)	183,308	158,609	54,341
Cash Flows From Investing Activities:
Capital expenditures	(202,967)	(197,355)	(160,939)
Other investing activities	(1,114)	(1,423)	(1,215)
Net cash provided (used)	(204,081)	(198,778)	(162,154)
Cash Flows From Financing Activities:
Proceeds from Issuance of Common Shares, net of issuance costs	61,998	40,000	10,000
Receipt of advances for and contributions in aid of construction	13,981	11,195	11,889
Refunds on advances for construction	(5,833)	(4,919)	(4,540)
Repayments of long-term debt	(454)	(370)	(334)
Proceeds from the issuance of long-term debt, net of issuance costs	99,397	64,569	129,665
Net changes in notes payable to banks	(111,000)	(26,000)	149,198
Net changes in affiliate borrowings	0	0	(129,000)
Dividends paid	(37,500)	(35,100)	(55,400)
Other financing activities	(1,190)	(1,063)	(840)
Net cash provided (used)	19,399	48,312	110,638
Net change in cash and cash equivalents	(1,374)	8,143	2,825
Cash and cash equivalents, beginning of year	11,338	3,195	370
Cash and cash equivalents, end of year	$ 9,964	$ 11,338	$ 3,195