Golden State Water 10-K 19 Feb 25 2024 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2024	Feb. 18, 2025	Jun. 28, 2024
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2024
Document Transition Report	false
Entity File Number	001-14431
Entity Registrant Name	American States Water Company
Entity Tax Identification Number	95-4676679
Entity Incorporation, State or Country Code	CA
Entity Address, Address Line One	630 E. Foothill Boulevard,
Entity Address, City or Town	San Dimas
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	91773-1212
City Area Code	(909)
Local Phone Number	394-3600
Title of 12(b) Security	Common Shares
Trading Symbol	AWR
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 2,694,439,281
Entity Common Stock, Shares Outstanding (in shares)		38,156,568
Documents Incorporated by Reference	Portions of the Proxy Statement of American States Water Company will be subsequently filed with the Securities and Exchange Commission as to Part III, Item Nos. 10, 11, 13 and 14 and portions of Item 12, in each case as specifically referenced herein.
Entity Central Index Key	0001056903
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
Amendment Flag	false
GSWC
Entity Information [Line Items]
Document Period End Date	Dec. 31, 2024
Entity File Number	001-12008
Entity Registrant Name	Golden State Water Company
Entity Tax Identification Number	95-1243678
Entity Incorporation, State or Country Code	CA
Entity Address, Address Line One	630 E. Foothill Boulevard,
Entity Address, City or Town	San Dimas
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	91773-1212
City Area Code	(909)
Local Phone Number	394-3600
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 0
Entity Common Stock, Shares Outstanding (in shares)		173.7586
Entity Central Index Key	0000092116
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
Amendment Flag	false

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2024
Audit Information [Abstract]
Auditor Firm ID	238
Auditor Name	PricewaterhouseCoopers LLP
Auditor Location	Los Angeles, California

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Regulated utility plant, at cost
Water	$ 2,227,311	$ 2,082,927
Electric	171,127	156,471
Total	2,398,438	2,239,398
Non-regulated utility property, at cost	44,457	40,223
Total utility plant, at cost	2,442,895	2,279,621
Less — accumulated depreciation	(648,199)	(624,472)
Utility plant before construction work in progress	1,794,696	1,655,149
Construction work in progress	304,929	237,131
Net utility plant	2,099,625	1,892,280
Other Property and Investments
Other Property and Investments	50,418	42,932
Property Plant and Equipment and Investments Other and Goodwill Net	50,418	42,932
Current Assets
Cash and cash equivalents	26,661	14,073
Accounts receivable — customers, less allowance for doubtful accounts	37,699	34,250
Unbilled receivable (Note 2)	28,446	23,516
Receivable from U.S. government, less allowance for doubtful accounts (Note 2)	41,000	49,306
Other accounts receivable, less allowance for doubtful accounts	6,415	6,340
Income taxes receivable	65	52
Materials and supplies	15,140	17,574
Regulatory assets — current	50,504	45,144
Prepayments and other current assets	7,286	5,767
Contract assets (Note 2)	20,130	9,956
Total current assets	233,346	205,978
Regulatory and Other Assets
Unbilled revenue, receivable from U.S government	3,423	4,886
Receivable from U.S. government (Note 2)	35,486	42,183
Contract assets (Note 2)	1,518	4,422
Operating lease right-of-use assets	8,028	7,982
Regulatory assets	27,101	25,585
Other	41,264	19,874
Total other assets	116,820	104,932
Total Assets	2,500,209	2,246,122
Capitalization
Common shareholder’s equity	920,051	776,109
Long-term debt	640,382	575,555
Total capitalization	1,560,433	1,351,664
Current Liabilities
Notes payable to banks	124,000	42,000
Long-term debt — current	385	353
Accounts payable	88,591	68,705
Income taxes payable	481	492
Accrued other taxes	16,694	14,654
Accrued employee expenses	15,523	14,738
Accrued interest	8,133	8,607
Contract liabilities (Note 2)	5,662	1,352
Operating lease liabilities	2,074	1,856
Purchase power contract derivative at fair value (Note 5)	8,823	2,360
Other	15,159	11,506
Total current liabilities	285,525	166,623
Other Credits
Note payable to bank, noncurrent	165,000	291,500
Advances for construction	69,856	67,431
Contributions in aid of construction — net	160,306	151,414
Deferred income taxes	180,173	161,577
Regulatory liabilities	22,926	1,222
Unamortized investment tax credits	942	1,011
Accrued pension and other post-retirement benefits	33,816	32,652
Operating lease liabilities	6,394	6,619
Other	14,838	14,409
Total other credits	654,251	727,835
Commitments and Contingencies
Total liabilities and capitalization	$ 2,500,209	$ 2,246,122

CONSOLIDATED STATEMENTS OF CAPI

CONSOLIDATED STATEMENTS OF CAPITALIZATION - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Common Stock, Par or Stated Value Per Share	$ 0	$ 0
Common stock, shares outstanding	38,151,027	36,980,612
Common stock, shares authorized	60,000,000	60,000,000
Common Shareholders' Equity:
Common shares, no par value	$ 355,143	$ 263,179
Retained earnings	564,908	512,930
Common shareholder’s equity	920,051	776,109
Long-Term Debt
Debt and Lease Obligation	643,893	579,047
Less: Current maturities	(385)	(353)
Debt Issuance Costs, Net	(3,126)	(3,139)
Long-Term Debt	640,382	575,555
Total capitalization	$ 1,560,433	$ 1,351,664
Common Stock
Common stock, shares outstanding	38,151,000	36,981,000
Common Shareholders' Equity:
Common shareholder’s equity	$ 355,143	$ 263,179
GSWC
Common Stock, Par or Stated Value Per Share	$ 0	$ 0
Common stock, shares outstanding	173.7586	171
Common stock, shares authorized	1,000	1,000
Common Shareholders' Equity:
Common shares, no par value	$ 413,797	$ 370,909
Retained earnings	392,036	332,919
Common shareholder’s equity	805,833	703,828
Long-Term Debt
Debt and Lease Obligation	608,893	544,047
Less: Current maturities	(385)	(353)
Debt Issuance Costs, Net	(2,961)	(2,956)
Long-Term Debt	605,547	540,738
Total capitalization	$ 1,411,380	$ 1,244,566
GSWC | Common Stock
Common stock, shares outstanding	173.7586	171
Common Shareholders' Equity:
Common shareholder’s equity	$ 413,797	$ 370,909
6.81% notes due 2028
Long-Term Debt
Debt and Lease Obligation	$ 15,000	$ 15,000
Interest rate per annum (as a percent)	6.81%	6.81%
6.81% notes due 2028 | GSWC
Long-Term Debt
Debt and Lease Obligation	$ 15,000	$ 15,000
Interest rate per annum (as a percent)	6.81%	6.81%
6.59% notes due 2029
Long-Term Debt
Debt and Lease Obligation	$ 40,000	$ 40,000
Interest rate per annum (as a percent)	6.59%	6.59%
6.59% notes due 2029 | GSWC
Long-Term Debt
Debt and Lease Obligation	$ 40,000	$ 40,000
Interest rate per annum (as a percent)	6.59%	6.59%
7.875% notes due 2030
Long-Term Debt
Debt and Lease Obligation	$ 20,000	$ 20,000
Interest rate per annum (as a percent)	7.875%	7.875%
7.875% notes due 2030 | GSWC
Long-Term Debt
Debt and Lease Obligation	$ 20,000	$ 20,000
Interest rate per annum (as a percent)	7.875%	7.875%
7.23% notes due 2031
Long-Term Debt
Debt and Lease Obligation	$ 50,000	$ 50,000
Interest rate per annum (as a percent)	7.23%	7.23%
7.23% notes due 2031 | GSWC
Long-Term Debt
Debt and Lease Obligation	$ 50,000	$ 50,000
Interest rate per annum (as a percent)	7.23%	7.23%
6.00% notes due 2041
Long-Term Debt
Debt and Lease Obligation	$ 62,000	$ 62,000
Interest rate per annum (as a percent)	6%	6%
6.00% notes due 2041 | GSWC
Long-Term Debt
Debt and Lease Obligation	$ 62,000	$ 62,000
Interest rate per annum (as a percent)	6%	6%
3.45% notes due 2029
Long-Term Debt
Debt and Lease Obligation	$ 15,000	$ 15,000
Interest rate per annum (as a percent)	3.45%	3.45%
3.45% notes due 2029 | GSWC
Long-Term Debt
Debt and Lease Obligation	$ 15,000	$ 15,000
Interest rate per annum (as a percent)	3.45%	3.45%
5.87% notes due 2028
Long-Term Debt
Debt and Lease Obligation	$ 40,000	$ 40,000
Interest rate per annum (as a percent)	5.87%	5.87%
5.87% notes due 2028 | GSWC
Long-Term Debt
Debt and Lease Obligation	$ 40,000	$ 40,000
Interest rate per annum (as a percent)	5.87%	5.87%
2.17% notes due 2030
Long-Term Debt
Debt and Lease Obligation	$ 85,000	$ 85,000
Interest rate per annum (as a percent)	2.17%	2.17%
2.17% notes due 2030 | GSWC
Long-Term Debt
Debt and Lease Obligation	$ 85,000	$ 85,000
Interest rate per annum (as a percent)	2.17%	2.17%
2.90% notes due 2040
Long-Term Debt
Debt and Lease Obligation	$ 75,000	$ 75,000
Interest rate per annum (as a percent)	2.90%	2.90%
2.90% notes due 2040 | GSWC
Long-Term Debt
Debt and Lease Obligation	$ 75,000	$ 75,000
Interest rate per annum (as a percent)	2.90%	2.90%
4.548% note due 2032
Long-Term Debt
Debt and Lease Obligation	$ 17,500	$ 17,500
Interest rate per annum (as a percent)	4.548%	4.548%
4.949% note due 2037
Long-Term Debt
Debt and Lease Obligation	$ 17,500	$ 17,500
Interest rate per annum (as a percent)	4.949%	4.949%
5.12% notes due 2033
Long-Term Debt
Debt and Lease Obligation	$ 100,000	$ 100,000
Interest rate per annum (as a percent)	5.12%	5.12%
5.12% notes due 2033 | GSWC
Long-Term Debt
Debt and Lease Obligation	$ 100,000	$ 100,000
Interest rate per annum (as a percent)	5.12%	5.12%
5.22 % note due 2038
Long-Term Debt
Debt and Lease Obligation	$ 30,000	$ 30,000
Interest rate per annum (as a percent)	5.22%	5.22%
5.22 % note due 2038 | GSWC
Long-Term Debt
Debt and Lease Obligation	$ 30,000	$ 30,000
Interest rate per annum (as a percent)	5.22%	5.22%
5.50% notes due 2027
Long-Term Debt
Debt and Lease Obligation	$ 65,000	$ 0
Interest rate per annum (as a percent)	5.50%
5.50% notes due 2027 | GSWC
Long-Term Debt
Debt and Lease Obligation	$ 65,000	0
Interest rate per annum (as a percent)	5.50%
5.50% notes due 2026
Long-Term Debt
Debt and Lease Obligation	$ 7,730	$ 7,730
Interest rate per annum (as a percent)	5.50%	5.50%
5.50% notes due 2026 | GSWC
Long-Term Debt
Debt and Lease Obligation	$ 7,730	$ 7,730
Interest rate per annum (as a percent)	5.50%	5.50%
State Water Project due 2035
Long-Term Debt
Debt and Lease Obligation	$ 1,807	$ 1,729
State Water Project due 2035 | GSWC
Long-Term Debt
Debt and Lease Obligation	1,807	1,729
American Recovery and Reinvestment Act Obligation due 2033
Long-Term Debt
Debt and Lease Obligation	2,356	2,588
American Recovery and Reinvestment Act Obligation due 2033 | GSWC
Long-Term Debt
Debt and Lease Obligation	$ 2,356	$ 2,588

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Revenues
Water	$ 417,410	$ 433,473	$ 340,602
Electric	51,645	41,832	39,986
Contracted services	126,404	120,394	110,940
Total operating revenues	595,459	595,699	491,528
Operating Expenses
Water purchased	74,274	72,864	75,939
Power purchased for pumping	15,025	12,829	11,861
Groundwater production assessment	24,145	20,850	19,071
Power purchased for resale	11,630	13,275	15,039
Supply cost balancing accounts	(1,894)	12,118	(12,000)
Other operation	41,318	40,271	38,095
Administrative and general	100,941	88,273	86,190
Depreciation and amortization	43,647	42,403	41,315
Maintenance	20,255	14,218	13,392
Property and other taxes	27,091	24,046	22,894
ASUS construction	54,544	57,912	53,171
Gain on sale of assets	0	(100)	(75)
Total operating expenses	410,976	398,959	364,892
Operating Income	184,483	196,740	126,636
Other Income and Expenses
Interest Expense, Nonoperating	50,382	42,762	27,027
Interest income	7,874	7,416	2,326
Other, net	7,466	5,126	125
Total other income and expenses	(35,042)	(30,220)	(24,576)
Income before income taxes	149,441	166,520	102,060
Income tax expense	30,173	41,599	23,664
Net Income	$ 119,268	$ 124,921	$ 78,396
Basic Earnings Per Common Share
Weighted Average Number of Shares Outstanding (in shares)	37,464	36,976	36,955
Basic earnings per Common Share (usd per share)	$ 3.17	$ 3.37	$ 2.12
Fully Diluted Earnings Per Share
Weighted Average Number of Diluted Shares (in shares)	37,583	37,077	37,039
Earnings Per Share, Diluted	$ 3.17	$ 3.36	$ 2.11
Dividends Paid Per Common Share (in USD per share)	$ 1.791	$ 1.655	$ 1.525
AWR
Other Income and Expenses
Income before income taxes	$ 117,332	$ 123,207	$ 77,799
Income tax expense	(1,936)	(1,714)	(597)
Net Income	$ 119,268	$ 124,921	$ 78,396
Basic Earnings Per Common Share
Weighted Average Number of Shares Outstanding (in shares)	37,464	36,976	36,955
Basic earnings per Common Share (usd per share)	$ 3.17	$ 3.37	$ 2.12
Fully Diluted Earnings Per Share
Weighted Average Number of Diluted Shares (in shares)	37,583	37,077	37,039
Earnings Per Share, Diluted	$ 3.17	$ 3.36	$ 2.11
Dividends Paid Per Common Share (in USD per share)	$ 1.791	$ 1.655	$ 1.525
GSWC
Operating Revenues
Water	$ 417,410	$ 433,473	$ 340,602
Total operating revenues	417,410	433,473	340,602
Operating Expenses
Water purchased	74,274	72,864	75,939
Power purchased for pumping	15,025	12,829	11,861
Groundwater production assessment	24,145	20,850	19,071
Supply cost balancing accounts	(1,621)	13,839	(8,643)
Other operation	28,349	29,064	28,117
Administrative and general	64,510	59,313	58,358
Depreciation and amortization	37,187	35,886	34,805
Maintenance	9,788	9,906	9,559
Property and other taxes	22,233	19,845	19,080
Gain on sale of assets	0	(100)	0
Total operating expenses	273,890	274,296	248,147
Operating Income	143,520	159,177	92,455
Other Income and Expenses
Interest Expense, Nonoperating	38,532	31,283	22,742
Interest income	6,018	5,557	1,083
Other, net	6,326	4,946	(680)
Total other income and expenses	(26,188)	(20,780)	(22,339)
Income before income taxes	117,332	138,397	70,116
Income tax expense	22,869	35,689	16,346
Net Income	$ 94,463	$ 102,708	$ 53,770

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN COMMON SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	GSWC	Common Stock	Common Stock GSWC	Earnings Reinvested in the Business	Earnings Reinvested in the Business GSWC
Beginning Balance (in shares) at Dec. 31, 2021			36,936,000	170
Beginning Balance at Dec. 31, 2021	$ 685,947	$ 615,686	$ 258,442	$ 356,530	$ 427,505	$ 259,156
Add:
Net Income	$ 78,396	$ 53,770			78,396	53,770
Issuance of Common Shares from an at-the-market program, net of issuance costs (in Shares)	25,956	0
Issuances of Common Shares under stock-based compensation plans ( in shares)			26,000
Issuances of Common Shares under stock-based compensation plans	$ 0		$ 0
Stock-based compensation, net of taxes paid from shares withheld from employees related to net share settlements	1,562	$ 1,450	1,562	1,450
Dividend equivalent rights on stock-based awards not paid in cash	154	143	$ 154	$ 143
Deduct:
Dividends on Common Shares	56,356	27,000			56,356	27,000
Dividend equivalent rights on stock-based awards	154	143			154	143
Ending Balance (in shares) at Dec. 31, 2022			36,962,000	170
Ending Balance at Dec. 31, 2022	709,549	643,906	$ 260,158	$ 358,123	449,391	285,783
Add:
Net Income	$ 124,921	$ 102,708			124,921	102,708
Issuance of Common Shares from an at-the-market program, net of issuance costs (in Shares)	18,371	1		1
Issuance of Common Shares from an at-the-market program, net of issuance costs		$ 10,000		$ 10,000
Issuances of Common Shares under stock-based compensation plans ( in shares)			19,000
Issuances of Common Shares under stock-based compensation plans	$ 0		$ 0
Stock-based compensation, net of taxes paid from shares withheld from employees related to net share settlements	2,834	2,614	2,834	2,614
Dividend equivalent rights on stock-based awards not paid in cash	187	172	$ 187	$ 172
Deduct:
Dividends on Common Shares	61,195	55,400			61,195	55,400
Dividend equivalent rights on stock-based awards	$ 187	$ 172			187	172
Ending Balance (in shares) at Dec. 31, 2023	36,980,612	171	36,981,000	171
Ending Balance at Dec. 31, 2023	$ 776,109	$ 703,828	$ 263,179	$ 370,909	512,930	332,919
Add:
Net Income	$ 119,268	$ 94,463			119,268	94,463
Issuance of Common Shares from an at-the-market program, net of issuance costs (in Shares)	25,196	2.7586	1,145,000	2.7586
Issuance of Common Shares from an at-the-market program, net of issuance costs	$ 88,661	$ 40,000	$ 88,661
Issuances of Common Shares under stock-based compensation plans ( in shares)			25,000
Issuances of Common Shares under stock-based compensation plans	0		$ 0
Stock-based compensation, net of taxes paid from shares withheld from employees related to net share settlements	3,030	2,642	3,030	$ 2,642
Dividend equivalent rights on stock-based awards not paid in cash	273	246	$ 273	$ 246
Deduct:
Dividends on Common Shares	67,017	35,100			67,017	35,100
Dividend equivalent rights on stock-based awards	$ 273	$ 246			273	246
Ending Balance (in shares) at Dec. 31, 2024	38,151,027	173.7586	38,151,000	173.7586
Ending Balance at Dec. 31, 2024	$ 920,051	$ 805,833	$ 355,143	$ 413,797	$ 564,908	$ 392,036

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash Flows From Operating Activities:
Net Income	$ 119,268	$ 124,921	$ 78,396
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	44,226	43,254	41,697
Provision for doubtful accounts	1,653	932	1,043
Deferred income taxes and investment tax credits	2,042	4,783	2,803
Stock-based compensation expense	3,744	3,298	2,571
(Gain) loss on investments held in a trust	(5,293)	(5,008)	5,177
Other — net	187	289	38
Changes in assets and liabilities:
Accounts receivable — customers	(5,110)	(6,632)	5,424
Unbilled receivable	(3,468)	(1,283)	9,699
Other accounts receivable	(369)	(2,241)	2,115
Unbilled receivable	15,003	(6,033)	(5,638)
Materials and supplies	2,434	(2,951)	(2,460)
Prepayments and other assets	32	1,581	3,146
Contract assets	(7,270)	604	(5,395)
Regulatory assets/liabilities	18,487	(81,373)	(18,915)
Accounts payable	5,152	(10,862)	11,767
Income taxes receivable/payable	(24)	2,493	(6,479)
Contract liabilities	4,310	449	646
Accrued pension and other post-retirement benefits	(208)	1,046	(3,087)
Other liabilities	3,936	416	(4,749)
Net cash provided (used)	198,732	67,683	117,799
Cash Flows From Investing Activities:
Capital expenditures	(231,960)	(188,540)	(166,240)
Other investing activities	(820)	(224)	(862)
Net cash provided (used)	(232,780)	(188,764)	(167,102)
Cash Flows From Financing Activities:
Proceeds from issuance of Common Shares to AWR (parent)	88,814	0	0
Receipt of advances for and contributions in aid of construction	11,195	11,889	6,901
Refunds on advances for construction	(4,919)	(4,540)	(5,321)
Repayments of long-term debt	(370)	(334)	(377)
Proceeds from the issuance of long-term debt, net of issuance costs	64,569	129,665	34,789
Net changes in notes payable to banks	(44,500)	54,590	72,000
Dividends paid	(67,017)	(61,195)	(56,356)
Other	(1,136)	(918)	(1,299)
Net cash provided (used)	46,636	129,157	50,337
Net change in cash and cash equivalents	12,588	8,076	1,034
Cash and cash equivalents, beginning of year	14,073	5,997	4,963
Cash and cash equivalents, end of year	26,661	14,073	5,997
GSWC
Cash Flows From Operating Activities:
Net Income	94,463	102,708	53,770
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	37,738	36,623	35,072
Provision for doubtful accounts	1,310	754	1,018
Deferred income taxes and investment tax credits	2,748	2,949	855
Stock-based compensation expense	3,279	2,994	2,269
(Gain) loss on investments held in a trust	(5,293)	(5,008)	5,177
Other — net	240	106	9
Changes in assets and liabilities:
Accounts receivable — customers	(5,004)	(6,321)	6,263
Unbilled receivable	(2,232)	(2,179)	5,519
Other accounts receivable	877	(1,484)	931
Materials and supplies	(163)	(1,260)	(736)
Prepayments and other assets	595	1,838	2,125
Regulatory assets/liabilities	24,386	(74,378)	(12,704)
Accounts payable	4,617	(5,420)	7,671
Income taxes receivable/payable	(3,031)	1,470	(4,664)
Intercompany receivable/payable	260	248	(805)
Accrued pension and other post-retirement benefits	(315)	979	(3,228)
Other liabilities	4,134	(278)	(4,034)
Net cash provided (used)	158,609	54,341	94,508
Cash Flows From Investing Activities:
Capital expenditures	(197,355)	(160,939)	(146,730)
Other investing activities	(1,423)	(1,215)	(1,001)
Net cash provided (used)	(198,778)	(162,154)	(147,731)
Cash Flows From Financing Activities:
Proceeds from issuance of Common Shares to AWR (parent)	40,000	10,000	0
Receipt of advances for and contributions in aid of construction	11,195	11,889	6,901
Refunds on advances for construction	(4,919)	(4,540)	(5,321)
Repayments of long-term debt	(370)	(334)	(377)
Proceeds from the issuance of long-term debt, net of issuance costs	64,569	129,665	0
Net changes in notes payable to banks	(26,000)	149,198	0
Net changes in intercompany borrowings	0	(129,000)	80,000
Dividends paid	(35,100)	(55,400)	(27,000)
Other	(1,063)	(840)	(1,135)
Net cash provided (used)	48,312	110,638	53,068
Net change in cash and cash equivalents	8,143	2,825	(155)
Cash and cash equivalents, beginning of year	3,195	370	525
Cash and cash equivalents, end of year	$ 11,338	$ 3,195	$ 370

BALANCE SHEETS

BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Assets
Utility Plant, at cost	$ 2,227,311	$ 2,082,927
Less — accumulated depreciation	(648,199)	(624,472)
Construction work in progress	304,929	237,131
Net utility plant	2,099,625	1,892,280
Other Property and Investments	50,418	42,932
Property Plant and Equipment and Investments Other and Goodwill Net	50,418	42,932
Current Assets
Cash and cash equivalents	26,661	14,073
Accounts receivable — customers, less allowance for doubtful accounts	37,699	34,250
Unbilled receivable	28,446	23,516
Other accounts receivable, less allowance for doubtful accounts	6,415	6,340
Income taxes receivable	65	52
Materials and supplies	15,140	17,574
Regulatory assets — current	50,504	45,144
Prepayments and other current assets	7,286	5,767
Total current assets	233,346	205,978
Other Assets
Operating lease right-of-use assets	8,028	7,982
Regulatory assets	27,101	25,585
Other	41,264	19,874
Total other assets	116,820	104,932
Total Assets	2,500,209	2,246,122
Capitalization
Common shareholder’s equity	920,051	776,109
Long-term debt	640,382	575,555
Total capitalization	1,560,433	1,351,664
Current Liabilities
Notes payable to banks	124,000	42,000
Long-term debt — current	385	353
Accounts payable	88,591	68,705
Income taxes payable	481	492
Accrued other taxes	16,694	14,654
Accrued employee expenses	15,523	14,738
Accrued interest	8,133	8,607
Operating lease liabilities	2,074	1,856
Other	15,159	11,506
Total current liabilities	285,525	166,623
Other Credits
Note payable to bank, noncurrent	165,000	291,500
Advances for construction	69,856	67,431
Contributions in aid of construction — net	160,306	151,414
Deferred income taxes	180,173	161,577
Regulatory liabilities	22,926	1,222
Unamortized investment tax credits	942	1,011
Accrued pension and other post-retirement benefits	33,816	32,652
Operating lease liabilities	6,394	6,619
Other	14,838	14,409
Total other credits	654,251	727,835
Total liabilities and capitalization	2,500,209	2,246,122
GSWC
Assets
Utility Plant, at cost	2,227,311	2,082,927
Less — accumulated depreciation	(561,256)	(543,135)
Total	1,666,055	1,539,792
Construction work in progress	245,314	195,742
Net utility plant	1,911,369	1,735,534
Other Property and Investments	47,753	40,480
Property Plant and Equipment and Investments Other and Goodwill Net	47,753	40,480
Current Assets
Cash and cash equivalents	11,338	3,195
Accounts receivable — customers, less allowance for doubtful accounts	34,712	31,018
Unbilled receivable	19,417	17,185
Other accounts receivable, less allowance for doubtful accounts	3,122	4,301
Intercompany receivables	120	380
Income taxes receivable	3,253	222
Materials and supplies	7,543	7,380
Regulatory assets — current	41,099	44,007
Prepayments and other current assets	5,880	4,544
Total current assets	126,484	112,232
Other Assets
Operating lease right-of-use assets	7,981	7,796
Regulatory assets	0	2,944
Other	38,394	17,169
Total other assets	46,375	27,909
Total Assets	2,131,981	1,916,155
Capitalization
Common shareholder’s equity	805,833	703,828
Long-term debt	605,547	540,738
Total capitalization	1,411,380	1,244,566
Current Liabilities
Notes payable to banks	124,000	0
Long-term debt — current	385	353
Accounts payable	70,896	55,488
Accrued other taxes	14,285	12,658
Accrued employee expenses	12,271	11,502
Accrued interest	7,438	7,508
Operating lease liabilities	2,036	1,725
Other	14,468	10,715
Total current liabilities	245,779	99,949
Other Credits
Note payable to bank, noncurrent	0	150,000
Advances for construction	69,836	67,411
Contributions in aid of construction — net	160,306	151,414
Deferred income taxes	166,410	147,458
Regulatory liabilities	22,926	1,222
Unamortized investment tax credits	942	1,011
Accrued pension and other post-retirement benefits	33,351	32,309
Operating lease liabilities	6,394	6,568
Other	14,657	14,247
Total other credits	474,822	571,640
Total liabilities and capitalization	$ 2,131,981	$ 1,916,155

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Nature of Operations : American States Water Company (“AWR”) is the parent company of Golden State Water Company (“GSWC”), Bear Valley Electric Service Inc. (“BVES”), and American States Utility Services, Inc. (“ASUS”) (and its subsidiaries, Fort Bliss Water Services Company (“FBWS”), Old Dominion Utility Services, Inc. (“ODUS”), Terrapin Utility Services, Inc. (“TUS”), Palmetto State Utility Services, Inc. (“PSUS”), Old North Utility Services, Inc. (“ONUS”), Emerald Coast Utility Services, Inc. (“ECUS”), Fort Riley Utility Services, Inc. (“FRUS”), Bay State Utility Services LLC (“BSUS”), and Patuxent River Utility Services LLC (“PRUS”)). AWR and its subsidiaries may be collectively referred to as “Registrant” or “the Company.” AWR, through its wholly owned subsidiaries, serves over one million people in ten states. GSWC and BVES are both California public utilities. GSWC engages in the purchase, production, distribution and sale of water throughout California serving approximately 264,600 customer connections. BVES distributes electricity in several San Bernardino County mountain communities in California serving approximately 24,900 customer connections. The California Public Utilities Commission (“CPUC”) regulates GSWC’s and BVES’s businesses in matters including properties, rates, services, facilities, and transactions between GSWC, BVES, and their affiliates. ASUS, through its wholly owned subsidiaries, operates, maintains and performs construction activities (including renewal and replacement capital work) on water and/or wastewater systems at various U.S. military bases pursuant to initial 50-year firm fixed-price contracts with the U.S. government and one 15 -year contract with the U.S. government. These contracts are subject to annual economic price adjustments and modifications for changes in circumstances, changes in laws and regulations, and additions to the contract value for new construction of facilities at the military bases. ASUS also from time to time performs construction services on military bases as a subcontractor. There is no direct regulatory oversight by the CPUC over AWR or the operations, rates or services provided by ASUS or any of its wholly owned subsidiaries. Basis of Presentation : The consolidated financial statements and notes thereto are presented in a combined report filed by two separate Registrants: AWR and GSWC. References in this report to “Registrant” are to AWR and GSWC, collectively, unless otherwise specified. AWR owns all of the outstanding common shares of GSWC, BVES and ASUS. ASUS owns all of the outstanding common shares of its subsidiaries. The consolidated financial statements of AWR include the accounts of AWR and its subsidiaries. These financial statements are prepared in conformity with accounting principles generally accepted in the United States of America. Intercompany transactions and balances have been eliminated in the AWR consolidated financial statements. Related-Party and Intercompany Transactions : As discussed in Note 9, prior to AWR and GSWC entering into new separate credit agreements in June 2023 that replaced AWR’s previous credit agreement, AWR borrowed under its credit facility and provided funds to both GSWC and ASUS in support of their operations. Under AWR’s current credit facility, AWR borrows and continues to provide funds to ASUS in support of its operations, through an intercompany borrowing agreement, and AWR (parent). The interest rate charged to ASUS is sufficient to cover AWR’s interest expense under the credit facility. GSWC’s credit facility provides support for its water operations. BVES has a separate credit facility and has also issued long-term debt to support its operations. Furthermore, GSWC, BVES and ASUS provide and/or receive various support services to and from their parent, AWR, and among themselves. GSWC allocates certain corporate office administrative and general costs to its affiliates, BVES and ASUS, using allocation factors approved by the CPUC. During the years ended December 31, 2024, 2023 and 2022, GSWC allocated to ASUS $5.3 million , $5.0 million and $5.2 million, respectively, of corporate office administrative and general costs. During the years ended December 31, 2024, 2023 and 2022, GSWC allocated corporate office administrative and general costs to BVES of $3.2 million , $3.5 million and $2.7 million, respectively. When necessary, AWR will make capital contributions to its regulated utilities in order to manage to the CPUC-authorized capital structure. In September 2024, BVES issued eleven Common Shares to AWR for total proceeds of $22.0 million. BVES used the proceeds from the stock issuance to pay down outstanding borrowings under its revolving credit facility and to fund its operations and capital expenditures. AWR made capital contributions to GSWC in 2024 and 2023 (Note 7). Utility Accounting : Registrant’s accounting policies conform to accounting principles generally accepted in the United States of America (“GAAP”), including the accounting principles for rate-regulated enterprises, which reflect the ratemaking policies of the CPUC and, to the extent applicable, the Federal Energy Regulatory Commission (“FERC”). GSWC and BVES have incurred various costs and received various credits reflected as regulatory assets and liabilities. Accounting for such costs and credits as regulatory assets and liabilities is in accordance with the guidance for accounting for the effects of certain types of regulation. This guidance sets forth the application of GAAP for those companies whose rates are established by or are subject to approval by an independent third-party regulator. Under such accounting guidance, rate-regulated entities defer costs and credits on the balance sheet as regulatory assets and liabilities when it is probable that those costs and credits will be recognized in the ratemaking process in a period different from the period in which they would have been reflected in income by an unregulated company. These regulatory assets and liabilities are then recognized in the income statement in the period in which the same amounts are reflected in the rates charged for service. The amounts included as regulatory assets and liabilities that will be collected or refunded over a period exceeding one year are classified as long-term assets and liabilities as of December 31, 2024 and 2023. Regulatory assets are reviewed for recoverability each reporting period. If a regulatory asset is no longer deemed probable of recovery, the deferred cost is charged to earnings. Property and Depreciation : Registrant’s property consists primarily of regulated utility plant at GSWC and BVES. GSWC and BVES capitalize, as utility plant, the cost of construction and the cost of additions, betterments and replacements of retired units of property. Such costs include labor, material and certain indirect costs. Indirect costs are allocated to each project based on total costs. Water systems acquired are recorded at estimated original cost of utility plant when first devoted to utility service and the applicable depreciation is recorded to accumulated depreciation. Any difference between the estimated original cost, less accumulated depreciation, and the purchase price, if recognized by the CPUC, is recorded as an acquisition adjustment within utility plant. Depreciation for the regulated utilities is computed on the straight-line, remaining-life basis, group method, in accordance with the applicable ratemaking process. The provision for depreciation expressed as a percentage of the aggregate depreciable asset balances for regulated utilities was approximately 2% fo r each of the years 2024, 2023 and 2022. Depreciation expense for regulated utilities, excluding amortization expense and depreciation on transportation equipment, totale d $39.8 million, $38.3 million and $37.3 million for the years ended December 31, 2024, 2023 and 2022, respectively. Depreciation computed on regulated utilities’ transportation equipment is recorded in other operating expenses and totaled $0.6 million , $0.9 million and $0.4 million for the years 2024, 2023 and 2022, respectively. For the year ended December 31, 2023, approximately $0.2 million of additional depreciation expense on GSWC's transportation equipment was recorded that relates to the cumulative retroactive impact for the full year of 2022 approved in the final CPUC decision in GSWC's general rate case that resulted from an increase to the transportation equipment composite depreciation rates that are retroactive to January 1, 2022. Expenditures for maintenance and repairs are expensed as incurred. Retired property costs, including costs of removal, are charged to the accumulated provision for depreciation. Estimated useful lives of regulated utilities’ utility plant, as authorized by the CPUC, are as follows: Source of water supply 20 years to 60 years Pumping 26 years to 41 years Water treatment 26 years to 32 years Transmission and distribution 15 years to 80 years Generation 40 years Other plant 5 years to 62 years Non-regulated property consists primarily of equipment utilized by ASUS and its subsidiaries for its operations. This property is stated at cost, net of accumulated depreciation, which is calculated using the straight-line method over the useful lives of the assets. Asset Retirement Obligations : GSWC has a legal obligation for the retirement of its wells, which by law need to be properly capped at the time of removal. As such, GSWC incurs asset retirement obligations. GSWC records the fair value of a liability for these asset retirement obligations in the period in which they are incurred. When the liability is initially recorded, GSWC capitalizes the cost by increasing the carrying amount of the related long-lived asset. Over time, the liability is accreted to its present value each period, and the capitalized cost is depreciated over the useful life of the related asset. Upon settlement of the liability, GSWC either settles the obligation for its recorded amount or incurs a gain or loss upon settlement. Retirement costs have historically been recovered through rates subsequent to the retirement costs being incurred. Accordingly, recoverability of GSWC’s asset retirement obligations are reflected as a regulatory asset (Note 3). GSWC also reflects the loss or gain at settlement as a regulatory asset or liability on the balance sheet. With regards to removal costs associated with certain other long-lived assets, such as water mains, distribution and transmission assets, asset retirement obligations have not been recognized as GSWC believes there is no legal obligation to do so. There are no CPUC rules or regulations that require GSWC to remove any of its other long-lived assets. In addition, GSWC’s water pipelines are not subject to regulation by any federal regulatory agency. GSWC has franchise agreements with various municipalities in order to use the public right of way for utility purposes (i.e., operate water distribution and transmission assets), and if certain events occur in the future, GSWC could be required to remove or relocate certain of its pipelines. However, it is not possible to estimate an asset retirement amount since the timing and the amount of assets that may be required to be removed, if any, is not known. Amounts recorded for asset retirement obligations are subject to various assumptions and determinations, such as determining whether a legal obligation exists to remove assets, estimating the fair value of the costs of removal, when final removal will occur and the credit-adjusted risk-free interest rates to be utilized on discounting future liabilities. Changes that may arise over time with regard to these assumptions will change amounts recorded in the future. Revisions in estimates for timing or estimated cash flows are recognized as changes in the carrying amount of the liability and the related capitalized asset. The estimated fair value of the costs of removal is based on third-party costs. Impairment of Long-Lived Assets : Long-lived assets are reviewed for impairment when events or changes in circumstances indicate that the carrying amount of an asset may not be fully recoverable in accordance with accounting guidance for impairment or disposal of long-lived assets. Impairment evaluation is based on a review of estimated future cash flows expected to be generated and if the carrying amount of a long-lived asset exceeds expected future cash flows, an impairment loss is recognized in the amount of the excess of fair value over the carrying amount. Registrant would recognize an impairment loss on its regulated assets only if the carrying value amount of a long-lived asset is not recoverable from customer rates authorized by the CPUC. Impairment loss is measured as the excess of the carrying value over the amounts recovered in customer rates. For the years ended December 31, 2024, 2023 and 2022, no impairment loss was incurred. Goodwill : At December 31, 2024 and 2023, AWR had $1.1 million of goodwill. Goodwill is included in Non-current Other Assets on the Consolidated Balance Sheets. The goodwill arose from ASUS’s acquisition of a subcontractor’s business at some of its subsidiaries. In accordance with the accounting guidance for testing goodwill, AWR annually assesses qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. For 2024 and 2023, AWR’s assessment of qualitative factors did not indicate that an impairment had occurred for goodwill at ASUS. Cash and Cash Equivalents : Cash and cash equivalents include short-term cash investments with an original maturity of three months or less. At times, cash and cash equivalent balances may be in excess of federally insured limits. Cash and cash equivalents are held with financial institutions with high credit standings. Accounts Receivable : Accounts receivable is reported on the balance sheet net of any allowance for doubtful accounts. The allowance for doubtful accounts is Registrant’s best estimate of the amount of probable credit losses in Registrant’s existing accounts receivable from its water and electric customers, and is determined based on expected losses rather than incurred losses. Registrant reviews the allowance for doubtful accounts quarterly. Account balances are written off against the allowance when it is probable the receivable will not be recovered. When utility customers request extended payment terms, credit is extended based on regulatory guidelines, and collateral is not required. Receivables from the U.S. government include amounts due under contracts with the U.S. government to operate and maintain, and/or provide construction services for the water and/or wastewater systems at military bases. Other accounts receivable consist primarily of amounts due from third parties (non-utility customers) for various reasons, including amounts due from contractors, amounts due under settlement agreements and amounts due from other third-party prime government contractors pursuant to agreements for construction of water and/or wastewater facilities for such third-party prime contractors. The allowance for these other accounts receivable is based on Registrant’s evaluation of the receivable portfolio under current conditions and a review of specific problems and such other factors that, in Registrant’s judgment, should be considered in estimating losses. Allowances for doubtful accounts are disclosed in Note 18. Materials and Supplies : Materials and supplies are stated at the lower of cost or net realizable value. Cost is computed using weighted average cost. Major classes of materials include pipes, meters, hydrants and valves. Interest : Interest incurred during the construction of capital assets has generally not been capitalized for financial reporting purposes as such policy is not followed in the ratemaking process. Interest expense is generally recovered through the regulatory process. At times, the CPUC has authorized certain capital projects to be filed for revenue recovery with advice letters when those projects are completed. During the time that such projects are under development and construction, GSWC or BVES may record an allowance for funds used during construction (“AFUDC”) as a component of construction work in progress to offset the cost of financing project construction if allowed by the regulator. After construction is completed, GSWC and BVES is permitted to recover these costs through the inclusion in rate base. For the year ended December 31, 2024 and 2022, BVES recorded $1.3 million and $0.1 million in AFUDC, respectively. The amount recorded in 2023 was insignificant. As a result of receiving the final decision on BVES’s general rate case (Note 3), BVES recorded $1.3 million in AFUDC on certain capital projects as authorized by the CPUC. GSWC did not receive any AFUDC during the years ended December 31, 2024, 2023 and 2022. Debt Issuance Costs and Redemption Premiums : Original debt issuance costs are deducted from the carrying value of the associated debt liability and amortized over the lives of the respective issuances of long-term debt. Premiums paid on the early redemption of debt are deferred as regulatory assets and amortized over the period that GSWC and BVES recovers such costs in rates, which is generally over the term of the new debt issued to finance early debt redemption. At December 31, 2024 and 2023, Registrant’s long-term debt have been issued by GSWC and BVES. Advances for Construction and Contributions in Aid of Construction : Advances for construction represent amounts advanced by developers for the cost to construct water system facilities in order to extend water service to their properties. Advances are refundable in equal annual installments, generally over 40 years. In certain instances, GSWC makes refunds on these advances over a specific period of time based on operating revenues related to the main or as new customers are connected to receive service from the main. Contributions in aid of construction are similar to advances but require no refunding. Generally, GSWC and BVES depreciate contributed property and amortize contributions in aid of construction at the composite rate of the related property. Utility plant funded by advances and contributions are excluded from rate base. Fair Value of Financial Instruments : For cash and cash equivalents, accounts receivable, accounts payable and short-term debt, the carrying amount is assumed to approximate fair value due to the short-term nature of the amounts. The table below estimates the fair value of long-term debt held by AWR and GSWC, respectively. Rates available to AWR and GSWC at December 31, 2024 and 2023 for debt with similar terms and remaining maturities were used to estimate fair value for long-term debt. Changes in the assumptions will produce differing results. 2024 2023 (dollars in thousands) Carrying Amount Fair Value Carrying Amount Fair Value Long-term debt—AWR (1)(2) $ 643,893 $ 608,184 $ 579,047 $ 556,214 2024 2023 (dollars in thousands) Carrying Amount Fair Value Carrying Amount Fair Value Long-term debt—GSWC (1) $ 608,893 $ 575,749 $ 544,047 $ 522,883 (1) Excludes debt issuance costs and redemption premiums. (2) Includes debt held by BVES of $35.0 million as of December 31, 2024 and 2023 , respectively. The accounting guidance for fair value measurements applies to all financial assets and financial liabilities that are being measured and reported on a fair value basis. Under the accounting guidance, Registrant has made fair value measurements that are classified and disclosed in one of the following three categories: Level 1 : Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities; Level 2 : Quoted prices in markets that are not active or inputs which are observable, either directly or indirectly, for substantially the full term of the asset or liability; or Level 3 : Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported by little or no market activity). Registrant makes fair value measurements on its publicly issued notes, private placement notes and other long-term debt using current U.S. corporate debt yields for similar debt instruments. Under the fair value guidance, these are classified as Level 2, which consists of quoted prices in markets that are not active, or inputs which are observable, either directly or indirectly, for substantially the full term of the asset or liability. The following table sets forth by level, within the fair value hierarchy, Registrant’s long-term debt measured at fair value as of December 31, 2024: (dollars in thousands) Level 1 Level 2 Level 3 Total Long-term debt—AWR — $ 608,184 — $ 608,184 (dollars in thousands) Level 1 Level 2 Level 3 Total Long-term debt—GSWC — $ 575,749 — $ 575,749 Stock-Based Awards : AWR has issued stock-based awards to its employees under stock incentive plans. AWR has also issued stock-based awards to its Board of Directors under non-employee directors stock plans. Registrant applies the provisions in the accounting guidance for share-based payments in accounting for all of its stock-based awards. See Note 13 for further discussion. New Accounting Guidance : Adopted in 2024 : In November 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update 2023-07 (Segment Reporting: Improvements to Reportable Segment Disclosures). The new standard enhances reportable segment disclosures and expands the disclosures required for reportable segments in annual and interim consolidated financial statements, primarily through enhanced disclosures of significant segment expenses. The adoption of the new guidance resulted in enhanced disclosure of Registrant's significant segment expenses, as discussed in Note 17. Not Yet Adopted: In December 2023, the FASB issued Accounting Standards Update 2023-09 (Improvements to Income Tax Disclosures) requiring public entities to provide more disclosures primarily related to the income tax rate reconciliation and income taxes paid. The guidance also eliminates certain existing disclosure requirements related to uncertain tax positions and unrecognized deferred tax liabilities. The guidance will be effective January 1, 2025 with early adoption permitted. The guidance is applied prospectively and Registrant is currently evaluating the impact of this standard on its income tax disclosures. In November 2024, the FASB issued Accounting Standards Update 2024-03, (Disaggregation of Income Statement Expenses) requiring public entities to disclose additional information about specific expense categories in the notes to the financial statements on an interim and annual basis. The guidance will be effective for fiscal years beginning after December 15, 2026, and for interim periods beginning after December 15, 2027, with early adoption permitted. Registrant is currently evaluating the impact of adopting this standard.

Revenues

Revenues	12 Months Ended
	Dec. 31, 2024
Revenue from Contract with Customer [Abstract]
Revenues	Revenues Most of Registrant’s revenues are accounted for under the revenue recognition accounting standard, “ Revenue from Contracts with Customers - (Topic 606). ” GSWC and BVES provide utility services to customers as specified by the CPUC. The transaction prices for water and electric revenues are based on tariff rates authorized by the CPUC, which include both quantity-based and flat-rate charges. Tariff revenues represent the adopted revenue requirement authorized by the CPUC intended to provide GSWC and BVES with an opportunity to recover its costs and earn a reasonable return on its net capital investment. The annual revenue requirements are comprised of supply costs, operation and maintenance costs, administrative and general costs, depreciation and taxes in amounts authorized by the CPUC, and a return on rate base consistent with the capital structure authorized by the CPUC. Water and electric revenues are recognized over time as customers simultaneously receive and use the utility services provided. Water and electric revenues include amounts billed to customers on a cyclical basis, nearly all of which are based on meter readings for services provided. Customer bills also include surcharges for cost-recovery activities, which represent CPUC-authorized balancing and memorandum accounts that allow for the recovery of previously incurred operating costs. Revenues from these surcharges have no impact to earnings as they are offset by corresponding increases in operating expenses to reflect the recovery of the associated costs. Customer payment terms are approximately 20 business days from the billing date. Unbilled revenues are amounts estimated to be billed for usage since the last meter-reading date to the end of the accounting period. The most recent customer billed usage forms the basis for estimating unbilled revenue. GSWC and BVES bill certain sales and use taxes levied by state or local governments to its customers. Included in these sales and use taxes are franchise fees, which are paid to various municipalities and counties (based on their ordinances) in order to use public rights of way for utility purposes. GSWC and BVES bill these franchise fees to its customers based on a CPUC-authorized rate for each ratemaking area as applicable. These franchise fees, which are required to be paid regardless of GSWC’s or BVES’s ability to collect them from its customers, are accounted for on a gross basis. Franchise fees billed to customers and recorded as operating revenue were approximately $4.6 million , $4.9 million and $4.0 million for the years ended December 31, 2024, 2023 and 2022, respectively. When GSWC or BVES acts as an agent, where the tax is not required to be remitted if it is not collected from customers, the tax is accounted for on a net basis. As currently authorized by the CPUC, GSWC and BVES record in revenues the difference between the adopted level of volumetric revenues as authorized by the CPUC for metered accounts (volumetric revenues) and the actual volumetric revenues recovered in customer rates. For GSWC, the difference is tracked under the Water Revenue Adjustment Mechanism (“WRAM”) regulatory accounts, and for BVES the difference is tracked in the Base Revenue Requirement Adjustment Mechanism (“BRRAM”) regulatory account. If this difference results in an under-collection of revenues, additional revenue is recorded only to the extent that the difference is expected to be collected within 24 months following the end of the year in which they are recorded in accordance with Accounting Standards Codification (“ASC”) Topic 980, Regulated Operations . ASUS’s initial 50-year firm fixed-price contract and additional firm fixed-price contracts, together referred to as (“50-year contract”) with the U.S. government are considered service concession arrangements under ASC 853 Service Concession Arrangements. ASUS’s military base contracts consist primarily of 50-year contracts and one 15-year contract with the U.S. government. These contracts are subject to annual economic price adjustments and modifications for changes in circumstances, changes in laws and regulations, and additions to the contract value for new construction of facilities at the military bases. The services under these contracts are accounted for under Topic 606 Revenue from Contracts with Customers and the water and/or wastewater systems are not recorded as Property, Plant and Equipment on Registrant’s balance sheet. For ASUS, performance obligations consist of (i) performing ongoing operation and maintenance of the water and/or wastewater systems and treatment plants for each military base served, and (ii) performing construction activities (including renewal and replacement capital work) on each military base served. The transaction price for each performance obligation is either delineated in, or initially derived from, the applicable 50-year contract and/or any subsequent contract modifications. Depending on the state in which operations are conducted, ASUS’s subsidiaries are also subject to certain state non-income tax assessments, which are accounted for on a gross basis and have been immaterial to date. The ongoing performance of operation and maintenance of the water and/or wastewater systems and treatment plants is viewed as a single performance obligation for each of the contract with the U.S. government. Registrant recognizes revenue for operations and maintenance fees monthly using the “right to invoice” practical expedient under ASC Topic 606. ASUS has a right to the consideration from the U.S. government in an amount that corresponds directly to the value for services provided to the U.S. government based on its subsidiaries' performance completed to-date. The contractual operations and maintenance fees are firm-fixed, and the level of effort or resources expended in the performance of the operations-and-maintenance-fees performance obligation is largely consistent over the contract term. Therefore, Registrant has determined that the monthly amounts invoiced for operations and maintenance performance are a fair reflection of the value transferred to the U.S. government. Invoices to the U.S. government for operations and maintenance service, as well as construction activities, are due upon receipt. ASUS’s construction activities consist of various projects to be performed. Each of these capital upgrade projects’ transaction prices are delineated either in the 50-year contract or through a specific contract modification for each construction project, which includes the transaction price for that project, or through a task order under a task order agreement. For renewal and replacement projects, the initial transaction price is based on the individual scope of work in accordance with contractual unit prices within the 50-year contract. Each construction project is viewed as a separate, single performance obligation. Therefore, it is generally unnecessary to allocate a construction transaction price to more than one construction performance obligation. Revenues for construction activities are recognized over time, with progress toward completion measured based on the input method using costs incurred relative to the total estimated costs (cost-to-cost method). Due to the nature of these construction projects, Registrant has determined the cost-to-cost input measurement to be the best method to measure progress towards satisfying its construction contract performance obligations, as compared to using an output measurement such as units produced. Changes in job performance, job site conditions, change orders and/or estimated profitability may result in revisions to costs and income for ASUS, and are recognized in the period in which any such revisions are determined. Pre-contract costs for ASUS, which consist of design and engineering labor costs, are deferred if recovery is probable, and are expensed as incurred if recovery is not probable. Deferred pre-contract costs have been immaterial to date. Contracted services revenues recognized during the years ended December 31, 2024, 2023 and 2022 from performance obligations satisfied in previous periods were not material. Although GSWC and BVES have a diversified base of residential, commercial, industrial and other customers, revenues derived from residential and commercial customers account for nearly 90% of total water revenues, and 90% of total electric revenues. The vast majority of ASUS’s revenues are from the U.S. government. For the years ended December 31, 2024, 2023, and 2022, disaggregated revenues from contracts with customers by segment are as follows: (dollar in thousands) For The Year Ended December 31, 2024 For The Year Ended December 31, 2023 For The Year Ended December 31, 2022 Water: Tariff-based revenues $ 405,756 $ 394,623 $ 324,838 CPUC-approved surcharges (cost-recovery activities) 2,914 2,955 2,461 Other 2,646 2,753 2,351 Water revenues from contracts with customers 411,316 400,331 329,650 WRAM under/(over)-collection (alternative revenue program) 6,094 33,142 10,952 Total water revenues (1) 417,410 433,473 340,602 Electric: Tariff-based revenues 50,628 40,130 39,750 CPUC-approved surcharges (cost-recovery activities) 173 567 144 Electric revenues from contracts with customers 50,801 40,697 39,894 BRRAM under/(over)-collection (alternative revenue program) 844 1,135 92 Total electric revenues (2) 51,645 41,832 39,986 Contracted services: Water 72,951 75,785 68,626 Wastewater 53,453 44,609 42,314 Contracted services revenues from contracts with customers 126,404 120,394 110,940 Total AWR revenues $ 595,459 $ 595,699 $ 491,528 (1) Water revenues for the year ended December 31, 2023 includes approximately $32 million from the impact of retroactive revenues for the full year of 2022 as a result of the CPUC’s approval of GSWC’s general rate case in June 2023. Furthermore, the CPUC also issued a final decision in June 2023 on GSWC’s cost of capital proceeding. As a result of the final cost of capital decision, for the year ended December 31, 2023, water revenues include $6.4 million from the reversal of revenues subject to refund due to a change in estimates from what had been recorded during 2022. (2) Electric revenues for the year ended December 31, 2024 include $3.7 million from the retroactive impact of revenues for the full year of 2023, resulting from the CPUC's approval of BVES’s general rate case (Note 3). The opening and closing balances of the receivable from the U.S. government, contract assets and contract liabilities from contracts with customers, which related entirely to ASUS, are as follows: (dollar in thousands) December 31, 2024 December 31, 2023 Unbilled receivables $ 10,910 $ 9,693 Receivable from the U.S. government $ 76,486 $ 91,489 Contract assets $ 21,648 $ 14,378 Contract liabilities $ 5,662 $ 1,352 Unbilled receivables and receivable from the U.S. government represent receivables where the right to payment is conditional only by the passage of time. Contract Assets - Contract assets are assets of ASUS and its subsidiaries and consist of unbilled revenues recognized from work-in-progress construction projects, where the right to payment is conditional on something other than the passage of time. The classification of this asset as current or noncurrent is based on the timing of when ASUS expects to bill these amounts. Contract Liabilities - Contract liabilities are liabilities of ASUS and its subsidiaries and consist of billings in excess of revenue recognized. The classification of this liabili ty as current or noncurrent is based on the timing of when ASUS expects to recognize revenue. Revenues for the year ended December 31, 2024 included in contract liabilities at the beginning of the period were not material. As of December 31, 2024, AWR’s aggregate remaining performance obligations, which are entirely from the contracted services segment, were $4.1 billion. ASUS expects to recognize revenue on these remaining performance obligations over the remaining term of each of the contracts, with the remaining contract terms that range from 14 to 49 years. Each of the contracts with the U.S. government is subject to termination, in whole or in part, prior to the end of its contract term for the convenience of the U.S. government.

Regulatory Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2024
Regulated Operations [Abstract]
Regulatory Matters	Regulatory Matters In accordance with accounting principles for rate-regulated enterprises, GSWC and BVES record regulatory assets, which represent probable future recovery of costs from customers through the ratemaking process, and regulatory liabilities, which represent probable future refunds that are to be credited to customers through the ratemaking process. At December 31, 2024, GSWC and BVES ha d a combined $54.7 million of net regulatory assets on the balance sheets, which included $149.8 million of regulatory assets net of $95.1 million o f regulatory liabilities. As authorized by the CPUC, the majority of the regulatory assets and liabilities accrue interest at the current 90-day commercial-paper rate. There are approximately $26.3 million of regulatory assets not accruing a carrying cost, which included $14.3 million related to flowed-through deferred income taxes, including the gross-up portion on the deferred tax resulting from the excess deferred income tax regulatory liability, and $8.8 million related to memorandum accounts authorized by the CPUC to track unrealized gains and losses on BVES’s purchase power contracts over the term of the contracts. The remaining $3.2 million relates to other regulatory assets that do not provide for a carrying cost. Furthermore, there are $92.1 million of regulatory liabilities not incurring interest that consisted of $67.5 million related to excess deferred income taxes arising from the lower federal income tax rate under the Tax Cuts and Jobs Act enacted in December 2017 that are being refunded to customers, and $23.5 million related to the net over funded position in Registrant’s pension and other retirement obligations (not including the two-way pension balancing accounts, which accrues interest). The remaining $1.1 million related to other regulatory liabilities do not accrue interest. Regulatory assets represent costs incurred by GSWC and/or BVES for which they have received or expect to receive rate recovery in the future. In determining the probability of costs being recognized in other periods, GSWC and BVES consider regulatory rules and decisions, past practices, and other facts or circumstances that would indicate if recovery is probable. If the CPUC determines that a portion of either GSWC’s or BVES’s assets are not recoverable in customer rates, the applicable utility must determine if it has suffered an asset impairment that requires it to write down the asset’s value. Regulatory assets are offset against regulatory liabilities within each ratemaking area. Amounts expected to be collected or refunded in the next twelve months have been classified as current assets and current liabilities by ratemaking area. Regulatory assets, less regulatory liabilities, included in the consolidated balance sheets are as follows: December 31, (dollars in thousands) 2024 2023 GSWC 2022/2023 general rate case memorandum accounts (unbilled revenue) $ 37,711 $ 52,795 Water revenue adjustment mechanism, net of the modified cost balancing account 29,738 41,545 Asset retirement obligations (Note 1) 7,501 7,099 Flowed-through deferred income taxes, net (Note 11) 12,506 3,190 Low income rate assistance balancing accounts 8,834 5,763 Other regulatory assets 11,352 10,661 Excess deferred income taxes (Note 11) (63,682) (70,189) Pensions and other post-retirement obligations (Note 12) (25,179) (4,867) Other regulatory liabilities (608) (268) Total GSWC $ 18,173 $ 45,729 BVES 2023/2024 general rate case memorandum accounts (unbilled revenue) 9,777 — Derivative instrument memorandum account (Note 5) 8,823 2,360 Wildfire mitigation and other fire prevention related costs memorandum accounts 14,681 17,716 Other regulatory assets 8,853 10,280 Other regulatory liabilities (5,628) (6,578) Total BVES $ 36,506 $ 23,778 Total AWR $ 54,679 $ 69,507 Water General Rate Case and the 2022/2023 General Rate Case Memorandum Accounts: In June 2023, the CPUC adopted a final decision in GSWC’s general rate case application for all its water regions and its general office that determined new water rates for the years 2022–2024. The new rates approved were retroactive to January 1, 2022. Upon receiving the final decision, GSWC filed for the implementation of new 2023 rate increases that went into effect on July 31, 2023. Due to the delay in finalizing the water general rate case, water revenues billed to customers for the year ended December 31, 2022 and for the period from January 1, 2023 to July 30, 2023 were based on 2021 adopted rates. GSWC was authorized to create general rate case memorandum accounts to track the revenue differences between the 2021 adopted rates and the 2022 and 2023 rates authorized by the CPUC for future recovery. In October 2023, surcharges were implemented to recover the cumulative retroactive rate differences over 36 months. As of December 31, 2024, there is an aggregate cumulative amount of $37.7 million under-collection in the general rate case memorandum accounts that GSWC recorded as regulatory assets for retroactive water revenues. Alternative-Revenue Programs: Since 2008, GSWC has recorded the difference between what it bills its water customers and that which is authorized by the CPUC using the Water Revenue Adjustment Mechanism (“WRAM”) and the Modified Cost Balancing Account (“MCBA”) approved by the CPUC. The over- or under-collection of the WRAM is aggregated with the MCBA over- or under-collection for the corresponding ratemaking area and bears interest at the current 90-day commercial paper rate . As of December 31, 2024, GSWC had an aggregated regulatory asset of $29.7 million, which is comprised of a $29.1 million under-collection in the WRAM accounts and a $0.6 million under-collection in the MCBA accounts. During 2024, GSWC recorded additional net under-collections in the WRAM/MCBA accounts of approximately $8.0 million that resulted largely from lower-than-adopted water usage as authorized in the general rate case decision. In May 2024, the CPUC approved the recovery of all pre-2024 WRAM/MCBA balances, with the majority of the balances to be recovered within 18 months. Accordingly, effective May 1, 2024, GSWC implemented surcharges to recover all of its WRAM/MCBA balances accumulated as of December 31, 2023. GSWC plans to file its 2024 WRAM/MCBA balances in the first quarter of 2025. As required by the accounting guidance for alternative revenue programs, in order to recognize the revenues under these programs, GSWC is required to collect its WRAM balances within 24 months following the end of the year in which an under-collection is recorded. As of December 31, 2024, there were no material WRAM under-collections that were estimated to be collected over more than a 24 month period. On January 30, 2025, the CPUC issued a final decision in connection with GSWC's general rate case that adopted a settlement agreement between GSWC and Cal Advocates and will set new rates for 2025 – 2027. In addition, the final d ecision rejected GSWC’s request for the continuation of the WRAM and MCBA, and instead orders GSWC to transition to a modified rate adjustment mechanism (a Monterey-style WRAM or “M-WRAM”) and an incremental cost balancing account (“ICBA”) for supply costs. The M-WRAM tracks the difference between the revenue based on actual metered sales through a tiered volumetric rate and the revenue that would have been received with the same actual metered sales if a standard quantity rate had been in effect. The ICBA for supply costs tracks differences between the authorized per-unit prices of water production costs and actual per-unit prices of water production costs. Both the M-WRAM and the ICBA are effective January 1, 2025. The final decision does not affect the recovery of the cumulative WRAM/MCBA balances recorded as of December 31, 2024. Electric General Rate Case and the 2023/2024 General Rate Case Memorandum Accounts: On August 30, 2022, BVES filed a general rate case application that will determine new electric rates for the years 2023 – 2026. On November 1, 2024, BVES, Cal Advocates, and the other intervenor in the proceeding filed a joint motion to adopt a settlement agreement between the parties resolving all issues in connection with the pending general rate case. On December 12, 2024, BVES received a proposed decision from the assigned administrative law judge at the CPUC in connection with the general rate case proceeding. On January 16, 2025, the CPUC adopted a final decision that, among other things, set the final new rates for the years 2023 – 2026, and adopts the settlement agreement in its entirety. BVES was authorized by the CPUC to establish a general rate case memorandum account that made the new rates retroactive to January 1, 2023. Because of the delay in finalizing the electric general rate case, billed electric revenues for the years of 2023 and 2024, were based on 2022 adopted rates . The general rate case memorandum account tracks the revenue differ ences between the 2022 adopted rates and the 2023 and 2024 rates authorized by the CPUC for future recovery. As of December 31, 2024 , an aggregate cumulative under-collection amount of $9.8 million in retroactive revenues related to the full year of 2023 and 2024 was recorded during the fourth quarter of 2024 along with a corresponding increase to BVES’s regulatory assets for future recovery from customers. Because of receiving a proposed decision in December 2024 followed by a final decision in January 2025, both of which approved the settlement agreement in its entirety, the impact of retroactive rates for the full year of 2023 and the 2024 second-year rate increases have been reflected in 2024 as it became probable that the approved retroactive rates would be permitted to be billed to customers in the future. Within 90 days from the effective date of the final decision, BVES will also file for recovery of the cumulative retroactive amounts related to 2023 and 2024, which are expected to be recovered over a 36 month period. Among other things, the settlement agreement also approves for recovery the requested capital expenditures and other incremental operating costs already incurred in connection with BVES’s wildfire mitigation plans that are currently not included in customer rates as discussed below. Cost of Capital Proceeding: In July 2023, a final decision was adopted by the CPUC in the cost of capital proceeding that, among other things, (i) adopts GSWC’s requested capital structure of 57% equity and 43% debt; (ii) adopts a cost of debt of 5.1%; (iii) adopts a return on equity of 8.85%; (iv) allows for the continuation of the Water Cost of Capital Mechanism (“WCCM”) through December 31, 2024; and (v) adopts the new cost of capital for the three-year period commencing January 1, 2022 through December 31, 2024. Based on the Company’s assessment of the final decision issued in June 2023, which made all adjustments to rates prospective and effective July 31, 2023, GSWC recorded a change in its estimate that resulted in an increase to water revenues for the year ended December 31, 2023 in the amount of $6.4 million as a result of reversing its regulatory liability for revenues subject to refund that it had recorded during 2022. Pensions and Other Post-retirement Obligations : Net regulatory liabilities have been recorded at December 31, 2024 and 2023, respectively, for costs that would otherwise be charged to “other comprehensive income” within shareholders’ equity for the funded status of Registrant’s pension and other post-retirement benefit plans because the cost of these plans have historically been recovered through rates. As discussed in Note 12, as of December 31, 2024, Registrant’s overfunded position for these plans have been recorded as regulatory liabilities and total $23.5 million. In addition, the CPUC has authorized GSWC and BVES to each use two-way balancing accounts to track differences between the forecasted annual pension expenses adopted in their respective customer rates and the actual annual expense to be recorded in accordance with the accounting guidance for pension costs. The two-way balancing accounts bear interest at the current 90-day commercial paper rate. As of December 31, 2024, GSWC has a $1.7 million over-collection related to the general office and water regions, and BVES has an insignificant balance in its two-way balancing account. Low Income Balancing Accounts: This regulatory asset reflects the net balance of the incremental administration costs, not already reflected in authorized rates, the customers’ discounts issued and the revenues generated by the low-income surcharges for the Customer Assistance Program in GSWC’s water regions and the California Alternate Rates for Energy program for BVES. These low-income programs, which are mandated by the CPUC, currently provide a flat discount based on 20% of a typical customer bill for qualified low-income water customers and a 20% discount for qualified low-income electric customers. The low-income balancing accounts accrue interest at the prevailing 90-day commercial paper rate. As of December 31, 2024, there is an aggregate $8.8 million under-collection in the low-income balancing accounts. Surcharges have been implemented to recover the costs included in these balancing accounts. Other BVES Regulatory Assets: Wildfire Mitigation and Other Fire Prevention Related Costs Balancing and Memorandum Accounts The CPUC adopted regulations intended to enhance the fire safety of overhead electric power lines. Those regulations included increased minimum clearances around electric power lines. BVES was authorized to track incremental costs incurred to implement the regulations in a fire hazard prevention memorandum account for the purpose of obtaining cost recovery in a future general rate case. On January 16, 2025, the CPUC issued a final decision in the electric general rate case that set new rates effective for 2023 through the year 2026, and included higher level of costs related to vegetation management, such as costs for increased minimum clearances around electric power lines. In addition, the final decision approved for recovery the incremental vegetation management costs incurred prior to 2023 that were not included in customer rates and were being tracked in a CPUC-approved balancing account for future recovery. The decision approves BVES’s recovery of vegetation management costs recorded prior to 2023. As of December 31, 2024, BVES has approximately $9.9 million in pre-2023 incremental vegetation management costs recorded as a regulatory asset. Furthermore, California legislation enacted in September 2018 requires all investor-owned electric utilities to have a wildfire mitigation plan (“WMP”) approved by the Office of Energy Infrastructure Safety (“OEIS”) and ratified by the CPUC. The WMP must include a utility’s plans on constructing, maintaining, and operating its electrical lines and equipment to minimize the risk of catastrophic wildfire. In the fourth quarter of 2024, OEIS approved BVES’s 2025 WMP update to its 2023-2025 WMP, which was ratified by the CPUC on January 16, 2025. The general rate case decision approved by the CPUC on January 16, 2025 also included costs related to BVES’s WMP in BVES’s revenue requirement. The final decision also authorized the recovery of incremental costs recorded prior to 2023 related to wildfire mitigation activities through WMP memorandum accounts. As of December 31, 2024, BVES recorded approximately $4.8 million as regulatory assets related to pre-2023 expenses accumulated in its WMP memorandum accounts for future recovery. Within 90 days from the effective date of the final decision in the general rate case, BVES will file for recovery of all pre-2023 costs included in the vegetation management and other WMP memorandum accounts discussed above, which are expected to be recovered over a 36-month surcharge. Other Regulatory Assets : Other regulatory assets represent costs incurred by GSWC or BVES for which they have received or expect to receive rate recovery in the future. Registrant believes that these regulatory assets are supported by regulatory rules and decisions, past practices, and other facts or circumstances that indicate recovery is probable. If the CPUC determines that a portion of either GSWC’s or BVES’s assets are not recoverable in customer rates, the applicable entity must determine if it has suffered an asset impairment that requires it to write down the regulatory asset to the amount that is probable of recover

Utility Plant and Intangible As

Utility Plant and Intangible Assets	12 Months Ended
	Dec. 31, 2024
Utility Plant and Intangible Assets
Utility Plant and Intangible Assets	Utility Plant and Intangible Assets The following table shows Registrant’s utility plant (regulated utility plant and non-regulated utility property) by major asset class: AWR GSWC (dollars in thousands) 2024 2023 2024 2023 Water Land $ 18,240 $ 18,290 $ 18,240 $ 18,290 Intangible assets 31,004 30,917 31,004 30,917 Source of water supply 115,247 111,112 115,247 111,112 Pumping 253,150 234,264 253,150 234,264 Water treatment 114,784 98,533 114,784 98,533 Transmission and distribution 1,589,763 1,489,974 1,589,763 1,489,974 Other 149,580 140,060 105,123 99,837 2,271,768 2,123,150 2,227,311 2,082,927 Electric Transmission and distribution 141,634 126,143 — — Generation 12,583 12,583 — — Other (1) 16,910 17,745 — — 171,127 156,471 — — Less — accumulated depreciation (648,199) (624,472) (561,256) (543,135) Construction work in progress 304,929 237,131 245,314 195,742 Net utility plant $ 2,099,625 $ 1,892,280 $ 1,911,369 $ 1,735,534 (1) Includes intangible assets of $1.2 million for the years ended December 31, 2024 and 2023 for studies performed. As of December 31, 2024 and 2023, intangible assets consist of the following: Weighted Average Amortization AWR December 31, GSWC December 31, (dollars in thousands) Period 2024 2023 2024 2023 Intangible assets : Conservation programs 3 years $ 9,486 $ 9,486 $ 9,486 $ 9,486 Water and service rights (2) 30 years 8,695 8,695 8,124 8,124 Water planning studies 14 years 14,250 14,164 13,012 12,926 Total intangible assets 32,431 32,345 30,622 30,536 Less — accumulated amortization (28,332) (27,275) (27,145) (26,294) Intangible assets, net of amortization $ 4,099 $ 5,070 $ 3,477 $ 4,242 Intangible assets not subject to amortization (3) $ 383 $ 383 $ 382 $ 382 (2) Includes intangible assets of $0.6 million for contracted services included in “Other Property and Investments” on the consolidated balance sheets as of December 31, 2024 and 2023. (3) The intangible assets not subject to amortization primarily consist of organization and consent fees. For the years ended December 31, 2024, 2023 and 2022, amortization of intangible assets was $1.0 million, $1.1 million and $0.6 million, respectively, for both AWR and GSWC. Estimated future consolidated amortization expense related to intangible assets are as follows (in thousands): Amortization 2025 $ 984 2026 984 2027 873 2028 863 2029 87 Total $ 3,791 Asset Retirement Obligations : The following is a reconciliation of the beginning and ending aggregate carrying amount of asset retirement obligations, which are included in “Other Credits” on the balance sheets as of December 31, 2024 and 2023: (dollars in thousands) GSWC Obligation at December 31, 2022 $ 10,103 Accretion 406 Obligation at December 31, 2023 $ 10,509 Additional liabilities incurred 148 Liabilities settled (328) Accretion 426 Obligation at December 31, 2024 $ 10,755

Derivative Instruments

Derivative Instruments	12 Months Ended
	Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives Instruments	Derivative Instruments In July 2023, the CPUC approved a new power purchase agreement between BVES and a third party to procure renewable portfolio standard eligible energy and renewable energy credits as a bundled product. BVES began taking power under this long-term contract during the fourth quarter of 2024 replacing expired long-term fixed price purchase power contracts over three The CPUC authorized the use of a regulatory asset and liability memorandum account to offset the mark-to-market entries required by the accounting guidance. Accordingly, all unrealized gains and losses generated from derivative instruments in purchase power contracts are deferred on a monthly basis into a non-interest-bearing regulatory memorandum account that tracks the changes in fair value of the derivative throughout the terms of the contracts. As a result, these unrealized gains and losses do not impact Registrant’s earnings. As of December 31, 2024, the fair value of the derivative liability was $8.8 million for the purchase power contract, with a corresponding regulatory asset recorded in the derivative instrument memorandum account as a result of overall fixed prices under BVES’s purchase power contract being higher than future energy prices. The notional volume of obligations remaining under the long-term contract as of December 31, 2024 was 578,448 megawatt hours. Registrant’s valuation model utilizes various inputs that include quoted market prices for energy over the duration of the contracts. The market prices used to determine the fair value for these derivative instruments were estimated based on independent sources such as broker quotes and publications that are not observable in or corroborated by the market. When such inputs have a significant impact on the measurement of fair value, the instrument is categorized as Level 3 as described in Note 1. Accordingly, the valuation of the derivatives on Registrant’s purchase power contracts have been classified as Level 3 for all periods presented. The change in fair value was due to the change in market energy prices for the years 2024 and 2023. The following table presents changes in the fair value of the Level 3 derivatives for the years 2024 and 2023: (dollars in thousands) 2024 2023 Fair value at beginning of the period $ (2,360) $ 11,847 Unrealized (losses) gains on purchase power contracts (6,463) (14,207) Fair value at end of the period $ (8,823) $ (2,360)

Military Privatization

Military Privatization	12 Months Ended
	Dec. 31, 2024
Military Privatization
Military Privatization	Military Base Operations ASUS’s subsidiaries have entered into service contracts with the U.S. government to operate and maintain, as well as perform construction activities to renew and replace, the water and/or wastewater systems at a military base or bases. The amounts charged for these services are primarily based upon the terms of the initial 50-year contract between ASUS’s subsidiaries and the U.S. government. Under the terms of each of these agreements, ASUS’s subsidiaries agree to operate and maintain the water and/or wastewater systems for: (i) a monthly net fixed-price for operation and maintenance, and (ii) an amount to cover renewal and replacement capital work. In addition, these contracts may also include firm fixed-priced initial capital upgrade projects to upgrade the existing infrastructure. Contract modifications are also issued for other necessary capital upgrades to the existing infrastructure approved by the U.S. government. ASUS through its subsidiaries may also from time to time perform construction services on military bases as a subcontractor or pursuant to task orders or fixed-price task order agreements. The contract serving Joint Base Cape Cod is currently the only task order agreement with the U.S. government. This task order agreement has a term of 15 years. On August 15, 2023, ASUS was awarded a new 50-year contract by the U.S. government to operate, maintain, and provide construction management services for the water distribution and wastewater collection and treatment facilities at Naval Air Station Patuxent River in Maryland. Operations commenced at Naval Air Station Patuxent River on April 1, 2024 after completion of the transition period. The initial value of the contract was estimated at approximately $349 million over a 50-year period subject to an inventory adjustment and annual economic price adjustments. In July 2024, the estimated contract value was increased to $378 million after an inventory adjustment. On September 29, 2023, ASUS was awarded a new 15-year contract by the U.S. government to operate, maintain, and provide construction management services for the water distribution and wastewater collection and treatment facilities at Joint Base Cape Cod (“JBCC”) located in Massachusetts. Operations at Joint Base Cape Cod commenced on April 15, 2024 after completion of the transition period. Under this contract, ASUS will perform work through the annual issuance of task orders by the U.S. government over a 15-year period up to a maximum value of $75.0 million subject to adjustments as task orders issued. In April 2024, the U.S. government awarded a task order valued at $4.1 million to ASUS for the first year of operation, maintenance, and renewal and replacement services of the water and wastewater systems at Joint Base Cape Cod. Under the terms of each of these contracts, prices are subject to an economic price adjustment (“EPA”) provision, on an annual basis. Prices may also be equitably adjusted for changes in law and other circumstances. ASUS's subsidiaries are permitted to file, and has filed, requests for equitable adjustment. Each of the contracts may be subject to termination, in whole or in part, prior to the end of the initial term for convenience of the U.S. government or as a result of default or nonperformance by an ASUS subsidiary. ASUS has experienced delays in receiving EPAs as provided for under its 50-year contracts. Because of the delays, EPAs, when finally approved, are retroactive. During 2024, with the exception of the newly awarded contracts, the U.S. government approved EPAs at all of the bases served. In some cases, these EPAs included retroactive operation and maintenance management fees for prior periods. For the years ended December 31, 2024, 2023 and 2022, retroactive operation and maintenance management fees related to prior periods were immaterial.

Earnings Per Share _ Capital St

Earnings Per Share / Capital Stock	12 Months Ended
	Dec. 31, 2024
Earnings Per Share [Abstract]
Earnings Per Share / Capital Stock	Earnings Per Share and Capital Stock In accordance with the accounting guidance for participating securities and earnings per share (“EPS”), Registrant uses the “two-class” method of computing EPS. The “two-class” method is an earnings allocation formula that determines EPS for each class of common stock and participating security. AWR has participating securities related to restricted stock units that earn dividend equivalents on an equal basis with AWR’s Common Shares, and that have been issued under AWR’s stock incentive plans for employees and non-employee directors stock plans. In applying the “two-class” method, undistributed earnings are allocated to both Common Shares and participating securities. The following is a reconciliation of Registrant’s net income and weighted average Common Shares outstanding used to calculate basic EPS: Basic: For The Years Ended December 31, (in thousands, except per share amounts) 2024 2023 2022 Net income $ 119,268 $ 124,921 $ 78,396 Less: impact from participating securities 419 372 197 Total income available to common shareholders $ 118,849 $ 124,549 $ 78,199 Weighted average Common Shares outstanding, basic 37,464 36,976 36,955 Basic earnings per Common Share $ 3.17 $ 3.37 $ 2.12 Diluted EPS is based upon the weighted average number of Common Shares, including both outstanding shares and shares potentially issuable in connection with restricted stock units granted under AWR’s stock incentive plans for employees and directors, and net income. The following is a reconciliation of Registrant’s net income and weighted average Common Shares outstanding used to calculate diluted EPS: Diluted: For The Years Ended December 31, (in thousands, except per share amounts) 2024 2023 2022 Common shareholders earnings, basic $ 118,849 $ 124,549 $ 78,199 Undistributed earnings for dilutive stock options and restricted stock units 183 189 55 Total common shareholders earnings, diluted $ 119,032 $ 124,738 $ 78,254 Weighted average Common Shares outstanding, basic 37,464 36,976 36,955 Stock-based compensation (1) 119 101 84 Weighted average Common Shares outstanding, diluted 37,583 37,077 37,039 Diluted earnings per Common Share $ 3.17 $ 3.36 $ 2.11 (1) In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 144,799, 115,684 and 96,988 restricted stock units, including performance awards to officers of AWR, at December 31, 2024, 2023 and 2022, respectively, were deemed to be outstanding in accordance with accounting guidance on earnings per share. On February 27, 2024, AWR entered into an Equity Distribution Agreement with third-party sales agents, under which AWR, may offer and sell its Common Shares, from time to time at its sole discretion, through an at-the-market (“ATM”) offering program having an aggregate gross offering price of up to $200 million over a three- year period and pursuant to AWR’s effective shelf registration statement on Form S-3. AWR intends to use the net proceeds from these sales, after deducting commissions on such sales and offering expenses, for general corporate purposes, including, but not limited to, repayment of debt and equity contributions to its subsidiaries. During 2024, AWR sold 1,145,219 Common Shares through this ATM offering program and raised proceeds of $89.5 million , net of $1.4 million in commissions paid, under the terms of the Equity Distribution Agreement. AWR also incurred $0.8 million of other expenses during the twelve months ended December 31, 2024 , which was primarily legal and other costs to establish this ATM offering program. As of December 31, 2024, approximately $109.1 million remained available for sale under the ATM offering program. During the years ended December 31, 2024, 2023 and 2022, AWR issued Common Shares totaling 25,196, 18,371 and 25,956, respectively, under AWR’s employee stock incentive plans and the non-employee directors’ plans. During 2024, 2023 and 2022, there were no cash proceeds received by AWR as a result of the exercise of stock options . AWR has not issued any Common Shares during 2024, 2023 and 2022 under AWR’s Common Share Purchase and Dividend Reinvestment Plan (“DRP”) and the 401(k) Plan. Shares reserved for the 401(k) Plan are in relation to AWR’s matching contributions and investment by participants. As of December 31, 2024, there were 1,055,948 and 387,300 C ommon Shares authorized for issuance directly by AWR but unissued under the DRP and the 401(k) Plan, respectively. During 2024 and 2023, GSWC issued 2.7586 and one common shares to AWR for total proceeds of approximately $40.0 million and $10.0 million, respectively. Proceeds from the stock issuances were used to pay down outstanding borrowings under its revolving credit facility and to fund its operations and capital expenditures. Prior to June 2023, proceeds were used to pay down a portion of intercompany borrowings owed to AWR as described in Note 1. No shares were issued by GSWC during 2022 . During the years ended December 31, 2024, 2023 and 2022, AWR and GSWC made payments to taxing authorities on employees’ behalf for shares withheld related to net share settlements. These payments are included in the stock-based compensation caption of the statements of equity. GSWC’s outstanding common shares are owned entirely by its parent, AWR. To the extent GSWC does not reimburse AWR for stock-based compensation awarded under various stock compensation plans, such amounts increase the value of GSWC’s common shareholder’s equity.

Dividend Limitations

Dividend Limitations	12 Months Ended
	Dec. 31, 2024
Disclosure of Restrictions on Dividends, Loans and Advances Disclosure [Abstract]
Dividend Limitations	Dividend Limitations GSWC is prohibited from paying dividends if, after giving effect to the dividend, its total indebtedness to capitalization ratio (as defined) would be more than 0.6667-to-1. Dividends in the amounts of $35.1 million, $55.4 million and $27.0 million were paid to AWR by GSWC during the years 2024, 2023 and 2022, respectively. The ability of AWR, GSWC, BVES and ASUS to pay dividends is also restricted by California law. Under California law, AWR, GSWC, BVES and ASUS are each permitted to distribute dividends to its shareholders so long as the Board of Directors determines, in good faith, that either: (i) the value of the corporation’s assets equals or exceeds the sum of its total liabilities immediately after the dividend, or (ii) its retained earnings equals or exceeds the amount of the distribution. Under the least restrictive of the California tests, approximately $920.1 million wa s available to pay dividends to AWR’s shareholders at December 31, 2024. Approximately $805.8 million

Bank Debt

Bank Debt	12 Months Ended
	Dec. 31, 2024
Bank Debt
Bank Debt	Bank Debts Registrant’s bank debts consist of outstanding borrowings made under three separate credit facilities at AWR (parent), GSWC and BVES. AWR (parent) and GSWC Credit Facilities : On June 28, 2023, AWR and GSWC, each entered into new credit agreements with a term of five years provided by a syndicate of banks and financial institutions. Both credit agreements will mature on June 28, 2028. In connection with the credit agreements, AWR and GSWC incurred, legal and other fees totaling $0.6 million and $0.8 million, respectively. The syndicated credit facilities replaced AWR’s previous credit agreement with a sole bank where AWR had a borrowing capacity of $280.0 million that supported GSWC and ASUS operations. Funds from the current facilities were used to pay-off in full all outstanding borrowings under AWR ’ s prior credit facility and GSWC ’ s outstanding intercompany borrowings from AWR. AWR’s credit agreement provided for a $150.0 million unsecured revolving credit facility to support AWR (parent) and ASUS. Under AWR’s credit agreement, the borrowing capacity may be expanded up to an additional amount of $75 million, subject to the lenders’ approval. On November 6, 2023, AWR’s credit facility was amended to increase the borrowing capacity from $150.0 million to $165.0 million to provide additional support to ASUS and AWR (parent). In connection with the increase in borrowing capacity. Furthermore, the aggregate amount that may be outstanding under letters of credit for AWR is $10.0 million. Loans may be obtained under the credit facilities at the option of AWR and bear interest at rates based on either a base rate plus an applicable margin or an adjusted term secured overnight financing rate (“ SOFR ”) determined by the SOFR administrator, the Federal Reserve Bank of New York, plus an applicable margin. The applicable margin depends upon AWR’s credit ratings. As of December 31, 2024 , AWR’s outstanding borrowings under its credit facility of $120.0 million have been classified as non-current liabilities on AWR’s Consolidated Balance Sheet. AWR’s credit agreement contains affirmative and negative covenants and events of default customary for credit facilities of this type, including, among other things, affirmative covenants relating to compliance with law and material contracts, and negative covenants relating to additional indebtedness, liens, investments, restricted payments and asset sales by AWR and its subsidiaries, other than BVES. AWR is not permitted to have a consolidated total capitalization ratio (as defined in the credit agreement), excluding BVES, greater than 0.65 to 1.00 at the end of any quarter. Default under any indebtedness of any subsidiary of AWR, other than BVES, will result in a default under AWR’s credit agreement. As of December 31, 2024, AWR was in compliance with these requirements. As of December 31, 2024, AWR had a capitalization ratio of 0.51 to 1.00. GSWC’s credit agreement provides for a $200.0 million unsecured revolving credit facility to support its operations and capital expenditures. Under GSWC’s credit agreement, the borrowing capacity may be expanded up to an additional amount of $75.0 million, also subject to the lenders’ approval. The aggregate amount that may be outstanding under letters of credit is $20.0 million. Loans may be obtained under this credit facility at the option of GSWC and bear interest at rates based on either a base rate plus an applicable margin or an adjusted term SOFR determined by the SOFR administrator plus an applicable margin. The applicable margin depends upon GSWC’s credit rating. GSWC ’ s credit facility is considered a short-term debt arrangement by the CPUC. GSWC has been authorized by the CPUC to borrow under the credit facility for a term of up to 24 months. Borrowings under this credit facility are, therefore, required to be fully paid off within a 24 -month period. GSWC’s next pay-off period ends in June 2025. Accordingly, as of December 31, 2024, GSWC ’ s outstanding borrowings under its credit facility of $124.0 million have been classified as current liabilities on GSWC’s Balance Sheet. GSWC expects to issue long-term debt and/or equity to facilitate the pay-off of its credit facility in 2025, after which GSWC may borrow under the credit facility again. Similar to AWR ’ s credit agreement, GSWC ’ s credit agreement also contains affirmative and negative covenants and events of default customary for credit facilities of its type. GSWC is also not permitted to have a total capitalization ratio greater than 0.65 to 1.00 at the end of any quarter. Default under any indebtedness of any subsidiary of AWR will not result in a default under GSWC’s credit agreement. As of December 31, 2024, GSWC was in compliance with these requirements, with total funded debt ratio of 0.48 to 1.00. BVES Credit Facility: BVES has a separate revolving credit facility without a parent guaranty that supports its electric operations and capital expenditures that provides a current borrowing capacity, as amended, of $65.0 million and expires on July 1, 2026. Under BVES’s amended credit agreement, the borrowing capacity may be expanded up to an additional amount of $10 million. BVES’s revolving credit facility is considered a short-term debt arrangement by the CPUC. Therefore, pursuant to the CPUC’s requirements, borrowings under this credit facility are required to be fully paid off within a 24 month period, after which, BVES may borrow under the credit facility again. BVES’s extended pay-off period as approved by the CPUC was set to end on May 1, 2025. On August 1, 2024, the CPUC issued a final decision in BVES’s financing application, which among other things, approved BVES’s request to issue up to $120 million of new long-term debt and equity securities. As a result of receiving approval of the financing application, on February 12, 2025, BVES completed the issuance of $50.0 million in unsecured private-placement notes maturing on February 12, 2030 (Note 10). BVES used the proceeds from the notes to pay down all amounts under its revolving credit facility outstanding at the time of issuing the notes. As a result of refinancing the outstanding borrowings under the revolving credit facility with 5-year term notes, as of December 31, 2024 the outstanding balance under BVES’s credit facility of $45.0 million has been classified as non-current liabilities in AWR’s Consolidated Balance Sheet. BVES amended its credit agreement and its term loan agreement related to the unsecured private placement notes issued in 2022, where effective December 19, 2024 and through the end of 2025, BVES must maintain a minimum interest coverage ratio of 3.0 times its interest expense, and 4.5 times its interest expense thereafter. BVES is also required to maintain a maximum consolidated total debt to consolidated total capitalization ratio of 0.65 to 1.00. As of December 31, 2024, BVES was in compliance with these requirements, with an actual interest coverage ratio of 4.60 times interest expense and a total funded debt ratio of 0.44 to 1.00 as of December 31, 2024. In addition, BVES is required to have a current safety certification issued by the CPUC, which it currently has. Registrant’s borrowing activities (excluding letters of credit) for the years ended December 31, 2024 and 2023 were as follows: December 31, (in thousands, except percent) 2024 2023 Balance Outstanding at December 31, $ 289,000 $ 333,500 Interest Rate at December 31, 5.33% ~ 5.94% 6.33% ~ 6.96% Average Amount Outstanding $ 315,811 $ 243,355 Weighted Average Annual Interest Rate 6.29 % 6.11 % Maximum Amount Outstanding $ 372,500 $ 333,500

Long-Term Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2024
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt Registrant’s long-term debt consists of notes and debentures of GSWC and BVES. Registrant summarizes its long-term debt in the Statements of Capitalization. GSWC and BVES do not currently have any secured debt. On June 5, 2024, GSWC completed the issuance of $65.0 million in unsecured private placement notes with a coupon rate of 5.50% , maturing on June 5, 2027. GSWC used the proceeds from the private placement notes to pay down outstanding borrowings under its revolving credit facility and to fund operations and capital expenditures. Interest payments are due semiannually on June 5 and December 5 each year, commencing December 5, 2024. The private placement notes rank equally with GSWC’s other unsecured and unsubordinated debt. GSWC may, at its option, redeem all or portions of the private placement notes at any time upon written notice, subject to payment of a make-whole premium. On January 13, 2023, GSWC issued $130.0 million unsecured private-placement notes consisting of: $100.0 million aggregate principal amount of Series A Senior Notes at a coupon rate of 5.12% due January 31, 2033 and $30.0 million aggregate principal amount of Series B Senior Notes at a coupon rate of 5.22% due January 31, 2038. GSWC used the proceeds to pay down intercompany borrowings with AWR and to fund operations and capital expenditures for GSWC. Interest is payable semiannually on January 31 and July 31 of each year. The Series A and Series B notes are unsecured and rank equally with GSWC’s unsecured and unsubordinated debt. GSWC may, at its option, redeem all or portions of the notes at any time upon written notice, subject to payment of a make-whole premium based on 50 basis points above the applicable treasury yield. The make-whole premiums and covenant requirements under these new notes are similar to the terms of the other private placement notes issued by GSWC. P ursuant to the terms of each of these notes, GSWC must maintain a total indebtedness to capitalization ratio (as defined) of less than 0.6667-to-1 and a total indebtedness to earnings before income taxes, depreciation and amortization (“EBITDA”) of less than 8-to-1. As of December 31, 2024, GSWC had a total indebtedness to capitalization ratio of 0.4754-to-1 and a total indebtedness to EBITDA of 3.8-to-1. On February 12, 2025, BVES completed the issuance of $50.0 million in unsecured private-placement notes with a coupon rate of 6.12% maturing on February 12, 2030. BVES used the proceeds from the notes to pay down all amounts under its revolving credit facility outstanding at the time of issuing the notes. Interest on these notes is payable semiannually, and the covenant requirements under these notes are similar to the terms of BVES’s other private placement notes issued in 2022, as well as its revolving credit facility agreement (Note 9). Registrant’s annual maturities of all long-term debt at December 31, 2024 are as follows (in thousands): 2025 $ 385 2026 8,133 2027 65,425 2028 55,446 2029 55,454 Thereafter 459,050 Total $ 643,893

Taxes on Income

Taxes on Income	12 Months Ended
	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Taxes on Income	Taxes on Income Registrant records deferred income taxes for temporary differences pursuant to the accounting guidance that addresses items recognized for income tax purposes in different periods than when they are reported in the financial statements. These items include differences in net asset basis (primarily related to differences in depreciation lives and methods, and differences in capitalization methods) and the treatment of certain regulatory balancing accounts, and construction contributions and advances. The accounting guidance for income taxes requires that rate-regulated enterprises record deferred income taxes and offsetting regulatory liabilities and assets for temporary differences where the rate regulator has prescribed flow-through treatment for rate-making purposes (Note 3). Deferred investment tax credits (“ITC”) are amortized ratably to deferred tax expense over the remaining lives of the property that gave rise to the credits. GSWC is included in both AWR’s consolidated federal income tax and its combined California state franchise tax returns. The impact of California’s unitary apportionment on the amount of AWR’s California income tax liability is a function of both the profitability of AWR’s non-California activities and the proportion of AWR’s California sales to its total sales. GSWC’s income tax expense is computed as if GSWC were autonomous and separately files its income tax returns, which is consistent with the method adopted by the CPUC in setting GSWC’s customer rates. On August 16, 2022, the Inflation Reduction Act of 2022 (“IRA”) was signed into federal law. IRA, among other things, imposes a nondeductible 1% excise tax after December 31, 2022 on the fair market value of certain stock that is “repurchased” by a publicly traded U.S. corporation or acquired by certain of its subsidiaries. The taxable amount is reduced by the fair market value of certain issuances of stock throughout the year. Registrant did not have a stock repurchase program in effect for 2023 and 2024 and does not have current plans to institute such a program; consequently, this excise tax was not incurred in 2023 and 2024 and is not expected to have a material impact on its consolidated financial position in the future. If average annual adjusted financial statement income exceeds $1 billion over a 3-taxable-year period, IRA also imposes a 15% corporate alternative minimum tax on adjusted financial statement income for taxable years beginning after December 31, 2022. Registrant does not expect to incur this tax in the foreseeable future. The significant components of the deferred tax assets and liabilities as reflected in the balance sheets at December 31, 2024 and 2023 are: AWR GSWC December 31, December 31, (dollars in thousands) 2024 2023 2024 2023 Deferred tax assets: Regulatory-liability-related (1) $ 28,851 $ 32,042 $ 27,171 $ 30,407 Contributions and advances 6,768 6,660 7,103 6,981 Other 5,801 5,924 5,632 6,041 Total deferred tax assets $ 41,420 $ 44,626 $ 39,906 $ 43,429 Deferred tax liabilities: Fixed assets $ (169,666) $ (161,820) $ (162,366) $ (155,131) Regulatory-asset-related: depreciation and other (43,149) (36,337) (39,635) (33,242) Balancing and memorandum accounts (non-flowed-through) (8,778) (8,046) (4,315) (2,514) Total deferred tax liabilities (221,593) (206,203) (206,316) (190,887) Accumulated deferred income taxes, net $ (180,173) $ (161,577) $ (166,410) $ (147,458) (1) Primarily represents the gross-up portion of the deferred income tax (on the excess-deferred-tax regulatory liability) brought about by the Tax Cuts and Jobs Act's reduction of the federal income tax rate. The current and deferred components of income tax expense are as follows: AWR Year Ended December 31, (dollars in thousands) 2024 2023 2022 Current Federal $ 19,680 $ 26,327 $ 14,845 State 8,451 10,489 6,016 Total current tax expense $ 28,131 $ 36,816 $ 20,861 Deferred Federal $ 1,656 $ 4,157 $ 2,991 State 386 626 (188) Total deferred tax (benefit) expense 2,042 4,783 2,803 Total income tax expense $ 30,173 $ 41,599 $ 23,664 GSWC Year Ended December 31, (dollars in thousands) 2024 2023 2022 Current Federal $ 13,570 $ 22,564 $ 10,582 State 6,551 10,176 4,909 Total current tax expense $ 20,121 $ 32,740 $ 15,491 Deferred Federal $ 1,362 $ 2,867 $ 1,507 State 1,386 82 (652) Total deferred tax (benefit) expense 2,748 2,949 855 Total income tax expense $ 22,869 $ 35,689 $ 16,346 The reconciliations of the effective tax rates (“ETR”) to the federal statutory rate are as follows: AWR Year Ended December 31, (dollars in thousands) 2024 2023 2022 Federal taxes on pretax income at statutory rate $ 31,383 $ 34,969 $ 21,433 Increase (decrease) in taxes resulting from: State income tax, net of federal benefit 6,508 9,785 4,335 Excess deferred tax amortization (1,467) (1,648) (1,311) Flow-through on fixed assets 1,075 1,067 1,076 Flow-through on removal costs (3,096) (2,255) (1,802) Investment tax credit (69) (71) (71) Excess deferred tax adjustment - change in estimate (5,015) — — Other – net 854 (248) 4 Total income tax expense from operations $ 30,173 $ 41,599 $ 23,664 Pretax income from operations $ 149,441 $ 166,520 $ 102,060 Effective income tax rate 20.2 % 25.0 % 23.2 % GSWC Year Ended December 31, (dollars in thousands) 2024 2023 2022 Federal taxes on pretax income at statutory rate $ 24,640 $ 29,063 $ 14,724 Increase (decrease) in taxes resulting from: State income tax, net of federal benefit 5,772 9,169 3,119 Excess deferred tax amortization (1,491) (1,681) (1,130) Flow-through on fixed assets 1,058 1,041 1,010 Flow-through on removal costs (3,029) (2,225) (1,715) Investment tax credit (69) (71) (71) Excess deferred tax adjustment - change in estimate (5,015) — — Other – net 1,003 393 409 Total income tax expense from operations $ 22,869 $ 35,689 $ 16,346 Pretax income from operations $ 117,332 $ 138,397 $ 70,116 Effective income tax rate 19.5 % 25.8 % 23.3 % The AWR and GSWC ETRs differ from the federal corporate statutory tax rate of 21% primarily due to (i) state taxes; (ii) permanent differences, including certain tax effects from stock compensation; (iii) the ongoing amortization of the excess deferred income tax liability; and (iv) differences between book and taxable income that are treated as flowed-through adjustments in accordance with regulatory requirements (principally from plant, rate-case, and compensation-related items). As regulated utilities, GSWC and BVES treat certain temporary differences as being flowed through to customers in computing their income tax expense consistent with the income tax method used in their CPUC-jurisdiction rate making. Flowed-through items either increase or decrease tax expense and thus impact the ETR. Furthermore, in connection with the 2017 Tax Cuts and Jobs Act, GSWC was required to remeasure its cumulative deferred income tax balances in 2017 to reflect the impact of the reduction in the corporate income tax rate from 35% to 21%, which resulted in excess deferred income taxes that were recorded as regulatory liabilities representing estimated amounts to be refunded to customers (Note 3). On January 30, 2025, the CPUC issued a final decision in connection with GSWC's recent general rate case that, among other things, adopted a settlement agreement between GSWC and Cal Advocates, which excluded from customer rates certain excess deferred income tax balances generated by activities outside of ratemaking that were previously recorded as regulatory liabilities. Because of the final CPUC decision, and an alternate proposed decision received in December 2024, both of which approved the settlement agreement in its entirety, GSWC recorded an income tax benefit of $5 million in 2024 to reflect a change in estimate that decreased its regulatory liabilities (Note 3) associated with excess deferred income tax balances as of December 31, 2024. AWR and GSWC had no unrecognized tax benefits at December 31, 2024, 2023 and 2022. Registrant’s policy is to classify interest on income tax over/underpayments in interest income/expense and penalties in “other” expenses. Registrant did not have any material interest receivables/payables from/to taxing authorities as of December 31, 2024 and 2023, nor did it recognize any material interest income/expense or accrue any material tax-related penalties during the years ended December 31, 2024, 2023 and 2022. Registrant files federal, California and various other state income tax returns. AWR’s 2021-2023 tax years remain subject to examination/assessment by the Internal Revenue Service. AWR filed refund claims with the California Franchise Tax Board (“FTB”) for the 2005 through 2020 tax years in connection with prior federal refund claims, other state issues, or both, and the FTB continues to review the claims. While the statute of limitations to assess tax has closed through the tax year 2019, the 2020–2023 tax years remain subject to examination/assessment by the FTB.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2024
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans Pension and Post-Retirement Medical Plans : Registrant maintains a defined benefit pension plan (the “Pension Plan”) that provides eligible employees (those aged 21 and older, hired before January 1, 2011) monthly benefits upon retirement based on average salaries and length of service. The eligibility requirement to begin receiving these benefits is 5 years of vested service. The normal retirement benefit is equal to 2% of the 5 highest consecutive years’ average earnings multiplied by the number of years of credited service, up to a maximum of 40, reduced by a percentage of primary Social Security benefits. There is also an early retirement option. Annual contributions are made to the Pension Plan, which comply with the funding requirements of the Employee Retirement Income Security Act (“ERISA”). At December 31, 2024, Registrant h ad 882 participants in the Pension Plan. Employees hired or rehired after December 31, 2010 are eligible to participate in a defined contribution plan. Registrant’s existing 401(k) Investment Incentive Program was amended to include this defined contribution plan. Under this plan, Registrant provides a contribution ranging from 3% to 5.25% of eligible pay each pay period into investment vehicles offered by the plan’s trustee. Full vesting under this plan occurs upon 3 years of service. Employees hired before January 1, 2011 continue to participate in and accrue benefits under the terms of the Pension Plan. Registrant also provides post-retirement medical benefits for all active employees hired before February of 1995 through a medical insurance plan. Eligible employees, who retire prior to age 65, and/or their spouses, are able to retain the benefits under the plan for active employees until reaching age 65. Eligible employees upon reaching age 65, and those eligible employees retiring at or after age 65, and/or their spouses, receive coverage through a Medicare supplement insurance policy paid for by Registrant subject to an annual cap limit. Registrant’s post-retirement medical plan does not provide prescription drug benefits to Medicare-eligible employees and is not affected by the Medicare Prescription Drug Improvement and Modernization Act of 2003. In accordance with the accounting guidance for the effects of certain types of regulation, Registrant has established a regulatory asset or liability for its underfunded or overfunded position, respectively, in its pension and post-retirement medical plans that is expected to be recovered through rates in future periods. The changes in actuarial gains and losses, prior service costs and transition assets or obligations are tracked and recognized as an adjustment to the regulatory account as these amounts are recognized as components of net periodic pension cost each year and in the rate-making process. The following table sets forth the Pension Plan’s and post-retirement medical plan’s funded status and amounts recognized in Registrant’s balance sheets and the components of net pension cost and accrued liability at December 31, 2024 and 2023: Pension Benefits Post-Retirement Medical (dollars in thousands) 2024 2023 2024 2023 Change in Projected Benefit Obligation: Projected benefit obligation at beginning of year $ 202,963 $ 190,678 $ 1,965 $ 2,014 Service cost 3,323 3,196 128 130 Interest cost 10,241 10,142 98 106 Actuarial (gain) loss (10,932) 8,525 (45) 49 Benefits/expenses paid (10,110) (9,578) (264) (334) Projected benefit obligation at end of year $ 195,485 $ 202,963 $ 1,882 $ 1,965 Changes in Plan Assets: Fair value of plan assets at beginning of year $ 205,305 $ 186,906 $ 12,827 $ 11,240 Actual return on plan assets 19,066 25,031 1,894 1,921 Employer contributions 2,902 2,946 256 265 Benefits/expenses paid (10,111) (9,578) (521) (599) Fair value of plan assets at end of year $ 217,162 $ 205,305 $ 14,456 $ 12,827 Funded Status: Overfunded/(underfunded) amount recognized $ 21,677 $ 2,342 $ 12,574 $ 10,862 The overfunded status of the Pension Plan was attributed to an increase in plan asset performance and an increase in the discount rate, which increased from 5.16% as of December 31, 2023 to 5.70% as of December 31, 2024. Pension Benefits Post-Retirement (dollars in thousands) 2024 2023 2024 2023 Amounts recognized on the balance sheets: Non-current assets $ 21,677 $ 2,342 $ 12,574 $ 10,862 Current liabilities — — — — Non-current liabilities — — — — Net amount recognized $ 21,677 $ 2,342 $ 12,574 $ 10,862 Amounts recognized in regulatory assets (liabilities) consist of: Prior service cost (credit) $ 1,020 $ 1,454 $ — $ — Net loss (gain) (19,867) (1,899) (6,531) (6,272) Regulatory assets (liabilities) (18,847) (445) (6,531) (6,272) Prefunded plan costs (2,830) (1,897) (6,043) (4,590) Net liability (asset) recognized $ (21,677) $ (2,342) $ (12,574) $ (10,862) Changes in plan assets and benefit obligations recognized in regulatory assets (liabilities): Regulatory asset (liability) at beginning of year $ (445) $ 6,012 $ (6,272) $ (5,846) Net loss (gain) (17,968) (6,023) (1,371) (1,395) New prior service cost — — — — Amortization of prior service (cost) credit (434) (434) — — Amortization of net gain (loss) — — 1,112 969 Total change in regulatory asset (liability) (18,402) (6,457) (259) (426) Regulatory asset (liability) at end of year $ (18,847) $ (445) $ (6,531) $ (6,272) Net periodic pension costs $ 1,968 $ 3,289 $ (1,453) $ (1,210) Change in regulatory asset (liability) (18,402) (6,457) (259) (426) Total recognized in net periodic pension cost and regulatory asset (liability) $ (16,434) $ (3,168) $ (1,712) $ (1,636) Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets: Projected benefit obligation $195,485 $202,963 $1,882 $1,965 Accumulated benefit obligation $186,679 $192,986 N/A N/A Fair value of plan assets $217,162 $205,305 $14,456 $12,827 Weighted-average assumptions used to determine benefit obligations at December 31: Discount rate 5.70 % 5.16 % 5.40 % 5.04 % Rate of compensation increase * * N/A N/A • Age-graded ranging from 2.5% to 6.0%. The components of net periodic pension and post-retirement benefits cost, before allocation to the overhead pool, for 2024, 2023 and 2022 are as follows: Pension Benefits Post-Retirement (dollars in thousands, except percent) 2024 2023 2022 2024 2023 2022 Components of Net Periodic Benefits Cost: Service cost $3,323 $3,196 $5,644 $128 $130 $129 Interest cost 10,241 10,142 7,401 98 106 60 Expected return on plan assets (12,030) (10,483) (13,166) (567) (477) (587) Amortization of prior service cost (credit) 434 434 434 — — — Amortization of actuarial (gain) loss — — — (1,112) (969) (1,734) Net periodic pension cost under accounting standards $1,968 $3,289 $313 $(1,453) $(1,210) $(2,132) Regulatory adjustment — (281) — — — — Total expense recognized, before surcharges and allocation to overhead pool $1,968 $3,008 $313 $(1,453) $(1,210) $(2,132) Weighted-average assumptions used to determine net periodic cost: Discount rate 5.16 % 5.41 % 2.89 % 5.04 % 5.34 % 2.46 % Expected long-term return on plan assets 6.00 % 5.75 % 5.75 % * * * Rate of compensation increase ** ** ** N/A N/A N/A * 5.75% for union plan and 4.0% for non-union (net of income taxes) in 2024 and 5.50% for union plan and 3.9% for non-union (net of income taxes) in 2023 and 2022. ** Age-graded ranging from 2.5% to 6.0%. Regulatory Adjustment : The CPUC authorized GSWC and BVES to track differences between the forecasted annual pension expenses adopted in rates and the actual annual exp enses recorded in accordance with the accounting guidance for pension costs in a two-way pension balancing account. During the years ended December 31, 2024 and 2022, GSWC’s actual pension expense was lower than the amounts included in water customer rates by $0.6 million and $1.5 million , respectively. Over-collections are recorded as a reduction in revenues. During the year ended December 31, 2023 , GSWC’s actual expense was higher than the amounts included in water customer rates of $0.3 million. The cumulative amount recorded in GSWC’s two-way pension balancing account is included within the pension s and other post-retirement obligations regulatory asset discussed in Note 3 . During the years ended December 31, 2023 and 2022, BVES’s actual expense was lower than the amounts included in electric rates in the amounts of $0.3 million and $0.5 million, respectively. As a result of receiving a final decision in its electric general rate case, an adjustment was made to the pension balancing account in the fourth quarter of 2024 retroactive to January 1, 202 3, resulting in an insignificant balance in the pension balancing account as of December 31, 2024. Plan Funded Status : The Pension Plan was overfunded at December 31, 2024 and 2023 . Registrant’s market value of plan assets is equal to the fair value of plan assets. Past volatile market conditions have affected and continue to affect the value of GSWC’s trust established to fund future long-term pension benefits. These benefit plan assets and related obligations are measured annually using a December 31 measurement date. Changes in the Pension Plan’s funded status will affect the assets and liabilities recorded on the balance sheet in accordance with accounting guidance on employers’ accounting for defined benefit pension and other post-retirement plans. Due to Registrant’s regulatory recovery treatment, the recognition of the under or overfunded status for the Pension Plan has been offset by a regulatory asset or liability, respectively, pursuant to guidance on the accounting for the effects of certain types of regulation. Plan Assets : The assets of the pension and post-retirement medical plans are managed by a third party trustee. The investment policy allocation of the assets in the trust was approved by Registrant’s Administrative Committee (the “Committee”) for the pension and post-retirement medical funds, which has oversight responsibility for all retirement plans. The primary objectives underlying the investment of the pension and post-retirement plan assets are: (i) attempt to maintain a fully funded status with a cushion for unexpected developments, possible future increases in expense levels and/or a reduction in the expected return on investments; (ii) seek to earn long-term returns that compare favorably to appropriate market indexes, peer group universes and the policy asset allocation index; (iii) seek to provide sufficient liquidity to pay current benefits and expenses; (iv) attempt to limit risk exposure through prudent diversification; and (v) seek to limit costs of administering and managing the plans. The Committee recognizes that risk and volatility are present to some degree with all types of investments. High levels of risk may be avoided through diversification by asset class, style of each investment manager and sector and industry limits. Investment managers are retained to manage a pool of assets and allocate funds in order to achieve an appropriate, diversified and balanced asset mix. The Committee’s strategy balances the requirement to maximize returns using potentially higher-return generating assets, such as equity securities, with the need to control the risk of its benefit obligations with less volatile assets, such as fixed-income securities. The Committee approves the target asset allocations. Registrant’s pension and post-retirement plan weighted-average asset allocations at December 31, 2024 and 2023, by asset category are as follows: Pension Benefits Post-Retirement Asset Category 2024 2023 2024 2023 Actual Asset Allocations : Equity securities 56 % 56 % 59 % 60 % Debt securities 39 % 39 % 40 % 39 % Real Estate Funds 5 % 5 % — % — % Cash equivalents — % — % 1 % 1 % Total 100 % 100 % 100 % 100 % Equity securities did not include AWR’s Common Shares as of December 31, 2024 and 2023. Target Asset Allocations: Pension Benefits Post-retirement Equity securities 60 % 60 % Debt securities 40 % 40 % Total 100 % 100 % The Pension Plan assets are in collective trust funds managed by a management firm appointed by the Committee. The fair value of these collective trust funds is measured using net asset value per share. In accordance with ASU 2015-07 Disclosures for Investments in Certain Entities that Calculate Net Asset Value per Share (or Its Equivalents) , the fair value of the collective trust funds is not categorized in the fair value hierarchy as of December 31, 2024 and 2023. The following tables set forth the fair value, measured by net asset value, of the pension investment assets as of December 31, 2024 and 2023: Net Asset Value as of December 31, 2024 (dollars in thousands) Fair Value Unfunded Commitments Redemption Frequency Redemption Notice Period Cash equivalents $ 939 — N/A N/A Fixed income fund 84,394 — Daily Daily Equity securities : U.S. small/mid cap funds 21,324 — Daily Daily U.S. large cap funds 53,819 — Daily Daily International funds 46,486 — Daily Daily Total equity funds 121,629 — Real estate funds 10,200 — Daily Daily Total $ 217,162 — Net Asset Value as of December 31, 2023 (dollars in thousands) Fair Value Unfunded Commitments Redemption Frequency Redemption Notice Period Cash equivalents $ 814 — N/A N/A Fixed income fund 80,737 — Daily Daily Equity securities : U.S. small/mid cap funds 19,162 — Daily Daily U.S. large cap funds 49,770 — Daily Daily International funds 45,377 — Daily Daily Total equity funds 114,309 Real estate funds 9,445 — Daily Daily Total $ 205,305 — The collective trust funds may be invested or redeemed daily, and generally do not have any significant restrictions to redeem the investments. As previously discussed in Note 1, the accounting guidance for fair value measurements establishes a framework for measuring fair value and requires fair value measurements to be classified and disclosed in one of three levels. As required by the accounting guidance, assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. All equity investments in the post-retirement medical plan are Level 1 investments in mutual funds. The fixed income category includes corporate bonds and notes. The majority of fixed income investments range in maturities from less than 1 to 20 years. The fair values of these investments are based on quoted market prices in active markets. The following tables set forth by level, within the fair value hierarchy, the post-retirement plan’s investment assets measured at fair value as of December 31, 2024 and 2023: Fair Value as of December 31, 2024 (dollars in thousands) Level 1 Level 2 Level 3 Total Fair Value of Post-Retirement Plan Assets: Cash equivalents $ 110 — — $ 110 Fixed income 5,818 — — 5,818 U.S. equity securities 8,528 — — 8,528 Total investments measured at fair value $ 14,456 — — $ 14,456 Fair Value as of December 31, 2023 (dollars in thousands) Level 1 Level 2 Level 3 Total Fair Value of Post-Retirement Plan Assets: Cash equivalents $ 189 — — $ 189 Fixed income 5,001 — — 5,001 U.S. equity securities 7,637 — — 7,637 Total investments measured at fair value $ 12,827 — — $ 12,827 Plan Contributions : During 2024, Registrant contributed $2.9 million to its pension plan and did not make a contribution to the post-retirement medical plan. Registrant expects to contribute approximately $3.4 million to its pension plan in 2025. Registrant’s policy is to fund the plans annually at a level which is deductible for income tax purposes and is consistent with amounts recovered in customer rates while also complying with ERISA’s funding requirements. Benefit Payments : Estimated future benefit payments at December 31, 2024 are as follows (in thousands): Pension Benefits Post-Retirement Medical Benefits 2025 $ 11,235 $ 282 2026 11,686 285 2027 12,255 264 2028 12,775 242 2029 13,458 182 Thereafter 72,271 693 Total $ 133,680 $ 1,948 Assumptions : Certain actuarial assumptions, such as the discount rate, long-term rate of return on plan assets, mortality, and the healthcare cost trend rate have a significant effect on the amounts reported for net periodic benefit cost as well as the related benefit obligation amounts. Discount Rate — The assumed discount rate for pension and post-retirement medical plans reflects the market rates for high-quality corporate bonds currently available. Registrant’s discount rates were determined by considering the average of pension yield curves constructed of a large population of high quality corporate bonds. The resulting discount rate reflects the matching of plan liability cash flows to the yield curves. Expected Long-Term Rate of Return on Assets — The long-term rate of return on plan assets represents an estimate of long-term returns on an investment portfolio consisting of a mixture of equities, fixed income and other investments. To develop the expected long-term rate of return on assets assumption for the pension plan, Registrant considered the historical returns and the future expectations for returns for each asset class, as well as the target asset allocation of the pension portfolio. Registrant’s policy is to fund the medical benefit trusts based on actuarially determined amounts as allowed in rates approved by the CPUC. Registrant has invested the funds in the post-retirement trusts that are intended to achieve a desired return and minimize amounts necessary to recover through rates. The mix is expected to provide for a return on assets similar to the Pension Plan and to achieve Registrant’s targeted allocation. This resulted in the selection of the 5.75% long-term rate of return on assets assumption for the union plan and 4.0% (net of income taxes) for the non-union plan portion of the post-retirement plan. Mortality — Mortality assumptions are a critical component of benefit obligation amounts and a key factor in determining the expected length of time for annuity payments. Registrant uses the latest mortality tables published by the Society of Actuaries. Accordingly, the benefit obligation amounts as of December 31, 2024 and 2023 have incorporated recent updates to the mortality tables. Healthcare Cost Trend Rate — The assumed health care cost trend rate for 2025 starts at 6.3% grading down to 3.9% in 2048 for those under age 65, and at 7.2% grading down to 3.9% in 2048 for those 65 and over. Assumed health care cost trend rates have a significant effect on the amounts reported for the health care plans. Supplemental Executive Retirement Plan : Registrant has a supplemental executive retirement plan (“SERP”) that is intended to restore retirement benefits to certain key employees and officers of Registrant that are limited by Sections 415 and 401(a)(17) of the Internal Revenue Code of 1986, as amended. The Board of Directors approved the establishment of a Rabbi Trust created for the SERP. Assets in a Rabbi Trust can be subject to the claims of creditors; therefore, they are not considered as an asset for purposes of computing the SERP’s funded status. As of December 31, 2024, the balance in the Rabbi Trust totaled $41.2 million and is included in Registrant’s other property and investments. All equity investments in the Rabbi Trust are Level 1 (as defined in Note 1) investments in mutual funds. The fixed income category includes corporate bonds and notes. The fair values of these investments are based on quoted market prices in active markets. The following tables set forth by level, within the fair value hierarchy, the Rabbi Trust investment assets measured at fair value as of December 31, 2024 and 2023: Fair Value as of December 31, 2024 (dollars in thousands) Level 1 Level 2 Level 3 Total Fair Value of Assets held in Rabbi Trust: Cash equivalents $ 11 — — $ 11 Fixed income securities 16,698 — — 16,698 Equity securities 24,478 — — 24,478 Total investments measured at fair value $ 41,187 — — $ 41,187 Fair Value as of December 31, 2023 (dollars in thousands) Level 1 Level 2 Level 3 Total Fair Value of Assets held in Rabbi Trust: Cash equivalents $ 6 — — $ 6 Fixed income securities 13,676 — — 13,676 Equity securities 20,461 — — 20,461 Total investments measured at fair value $ 34,143 — — $ 34,143 The following provides a reconciliation of benefit obligations, funded status of the SERP, as well as a summary of significant estimates at December 31, 2024 and 2023: (dollars in thousands) 2024 2023 Change in Benefit Obligation: Benefit obligation at beginning of year $ 33,594 $ 30,807 Service cost 1,430 1,248 Interest cost 1,706 1,644 Actuarial loss (gain) (1,028) 840 Benefits paid (944) (945) Benefit obligation at end of year $ 34,758 $ 33,594 Changes in Plan Assets: Fair value of plan assets at beginning and end of year — — Funded Status: Net amount recognized as accrued cost $ (34,758) $ (33,594) (in thousands) 2024 2023 Amounts recognized on the balance sheets: Current liabilities $ (942) $ (942) Non-current liabilities (33,816) (32,652) Net amount recognized $ (34,758) $ (33,594) Amounts recognized in regulatory assets consist of: Prior service cost $ — $ — Net loss 1,855 2,869 Regulatory assets 1,855 2,869 Unfunded accrued cost 32,903 30,725 Net liability recognized $ 34,758 $ 33,594 Changes in plan assets and benefit obligations recognized in regulatory assets consist of: Regulatory asset at beginning of year $ 2,869 $ 1,995 Net (gain) loss (1,028) 840 Amortization of prior service credit — — Amortization of net gain (loss) 14 34 Total change in regulatory asset (1,014) 874 Regulatory asset at end of year $ 1,855 $ 2,869 Net periodic pension cost $ 3,122 $ 2,858 Change in regulatory asset (1,014) 874 Total recognized in net periodic pension and regulatory asset $ 2,108 $ 3,732 Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets: Projected benefit obligation $ 34,758 $ 33,594 Accumulated benefit obligation 33,196 30,794 Fair value of plan assets — — Weighted-average assumptions used to determine benefit obligations: Discount rate 5.66 % 5.15 % Rate of compensation increase * * * Age graded from 4.0% to 4.5% per year. The components of SERP expense, before allocation to the overhead pool, for 2024, 2023 and 2022 are as follows: (dollars in thousands, except percent) 2024 2023 2022 Components of Net Periodic Benefits Cost: Service cost $ 1,430 $ 1,248 $ 1,191 Interest cost 1,706 1,644 1,022 Amortization of net (gain) loss (14) (34) 580 Net periodic pension cost $ 3,122 $ 2,858 $ 2,793 Weighted-average assumptions used to determine net periodic cost: Discount rate 5.15 % 5.42 % 2.87 % Rate of compensation increase * * * * A ge graded from 4.0% to 4.5% per year. Benefit Payments : Estimated future benefit payments for the SERP at December 31, 2024 are as follows (in thousands): 2025 $ 942 2026 2,656 2027 2,834 2028 2,806 2029 2,901 Thereafter 14,489 Total $ 26,628 401(k) Investment Incentive Program : Registrant has a 401(k) Investment Incentive Program under which employees may invest a percentage of their pay, up to a maximum investment prescribed by law, in an investment program managed by an outside investment manager. Registrant’s cash contributions to the 401(k) are based upon a percentage of individual employee contributions and for the years ended December 31, 2024, 2023 and 2022 were $3.0 million, $2.9 million and $2.7 million, respectively. The Investment Incentive Program also incorporates the defined contribution plan for employees hired on or after January 1, 2011. The cash contributions to the defined contribution plan for the years ended December 31, 2024, 2023 and 2022 were $2.5 million, $2.2 million and $2.0 million, respectively.

Stock-Based Compensation Plans

Stock-Based Compensation Plans	12 Months Ended
	Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]
Stock-Based Compensation Plans	Stock-Based Compensation Plans Summary Description of Stock Incentive Plans As of December 31, 2024, AWR had three stock incentive plans: the 2016 stock incentive plan for its employees, and the 2003 and 2023 non-employee directors plans for its Board of Directors, each more fully described below. 2016 Employee Plans — AWR adopted this employee plan, following shareholder approval, to provide stock-based incentive awards in the form of restricted stock units, stock options and restricted stock to employees as a means of promoting the success of Registrant by attracting, retaining and more fully aligning the interests of employees with those of customers and shareholders. The 2016 employee plan also provides for the grant of performance awards. There are no stock options or restricted stock grants currently outstanding. For restricted stock unit awards, the Compensation Committee determines the specific terms, conditions and provisions relating to each restricted stock unit. Each employee who has been granted a time-vested restricted stock unit is entitled to dividend equivalent rights in the form of additional restricted stock units until vesting of the time-vested restricted stock units. In general, time-vested restricted stock units vest over a period of three years. Restricted stock units may also vest upon retirement if the grantee is at least 55 and the sum of the grantee’s age and years of service are equal to or greater than 75, or upon death or total disability. In addition, restricted stock units may vest following a change in control if the applicable subsidiary of AWR terminates the grantee other than for cause or the employee terminates employment for good reason. Each restricted stock unit is non-voting and entitles the holder of the restricted stock unit to receive one Common Share. The Compensation Committee also has the authority to determine the number, amount or value of performance awards, the duration of the performance period or performance periods applicable to the award and the performance criteria applicable to each performance award for each performance period. Each outstanding performance award granted by the Compensation Committee has been in the form of restricted stock units that generally vest over a period of three years as provided in the performance award agreement. The amount of the performance award paid to an employee depends upon satisfaction of performance criteria following the end of a three-year performance period. Performance awards may also vest and be payable upon retirement if the grantee is at least 55 and the sum of the grantee’s age and years of service are equal to or greater than 75, or upon death or total disability. In addition, performance awards may vest following a change in control if the applicable subsidiary of AWR terminates the grantee other than for cause or the employee terminates employment for good reason. The amount of the payment for performance awards granted will be at target in the event of death or a termination of employment (other than for cause) by the applicable subsidiary of AWR or termination by the employee for good reason within 24 months after a change in control. In all other circumstances, adjustments will be made to the amount of the payment to take into account the shortened performance period. 2003 and 2023 Directors Plans — The Board of Directors and shareholders of AWR have approved the 2003 and 2023 directors plans in order to provide the non-employee directors with supplemental stock-based compensation to encourage them to increase their stock ownership in AWR. New grants may not be made under the 2003 directors plan. Under the 2023 non-employee directors plan, non-employee directors are entitled to receive restricted stock units in an amount determined by the Board of Directors prior to the meeting; provided that, in no event may that amount be equal to more than two times the then current annual retainer for services as a director divided by the fair market value of AWR’s Common Shares on the date preceding the annual meeting. Such units are convertible into AWR’s Common Shares 90 days after the grant date. All non-employee directors of AWR who were directors of AWR at the 2003 annual meeting have also received restricted stock units, which will be distributed upon termination of the director’s service as a director. All restricted stock units and performance awards have been granted with dividend equivalent rights payable in the form of additional restricted stock units. Recognition of Compensation Expense Registrant recognizes compensation expense related to the fair value of stock-based compensation awards. Share-based compensation cost is measured at the grant date, based on the calculated fair value of the award, and is recognized as an expense over the employee’s requisite service period (generally the vesting period of the equity grant). Immediate vesting occurs if the employee is at least 55 years old and the sum of the employee’s age and years of employment is equal to or greater than 75. Registrant assumes that pre-vesting forfeitures will be minimal, and recognizes pre-vesting forfeitures as they occur, which results in a reduction in compensation expense. The following table presents share-based compensation expenses for the years ended December 31, 2024, 2023 and 2022. These expenses resulting from restricted stock units, including performance awards, are included in administrative and general expenses in AWR’s and GSWC’s statements of income: AWR GSWC For The Years Ended December 31, For The Years Ended December 31, (in thousands) 2024 2023 2022 2024 2023 2022 Stock-based compensation related to: Restricted stock units $ 3,744 $ 3,298 $ 2,571 $ 3,279 $ 2,994 $ 2,269 Total stock-based compensation expense $ 3,744 $ 3,298 $ 2,571 $ 3,279 $ 2,994 $ 2,269 Equity-based compensation cost capitalized as part of utility plant for the years ended December 31, 2024, 2023 and 2022 was approximately $0.4 million , $0.5 million and $0.3 million, respectively, for both AWR and GSWC. For the years ended December 31, 2024, 2023 and 2022, approximately $0.9 million, $0.8 million and $0.9 million, respectively, of tax benefits from stock-based awards were recorded for both AWR and GSWC. Registrant amortizes stock-based compensation over the requisite (vesting) period for the entire award. Time-vesting restricted stock units vest and become non-forfeitable in installments of 33% the first two years and 34% in the third year, starting one year from the date of the grant. Outstanding performance awards vest and become non-forfeitable in installments of 33% the first two years and 34% in the third year and are distributed at the end of the performance period to the extent that the Compensation Committee determines that the performance criteria set forth in the award agreement have been satisfied. Restricted Stock Units (Time-Vested) — A restricted stock unit (“RSU”) represents the right to receive a share of AWR’s Common Shares and are valued based on the fair market value of AWR’s Common Shares on the date of grant. The fair value of RSUs were determined based on the closing trading price of Common Shares on the grant date. A summary of the status of Registrant’s outstanding RSUs, excluding performance awards, to employees and directors as of December 31, 2024, and changes during the year ended December 31, 2024, is presented below: Number of Weighted Average Restricted share units at January 1, 2024 50,327 $ 54.00 Granted 27,051 74.02 Vested (18,301) 86.27 Forfeited (786) 80.70 Restricted share units at December 31, 2024 58,291 $ 52.80 As of December 31, 2024, there was approximately $0.7 million of total unrecognized compensation cost related to time-vested restricted stock units granted under AWR’s employee stock plans. That cost is expected to be recognized over a weighted average period of 1.51 years. Restricted Stock Units (Performance Awards) – During the years ended December 31, 2024, 2023 and 2022, the Compensation Committee granted performance awards in the form of restricted stock units to officers of Registrant. A performance award represents the right to receive a share of AWR’s Common Shares if the Compensation Committee determines that specified performance goals have been met over the performance period specified in the grant (generally three years). Each grantee of any outstanding performance award may earn between 0% and up to 200% or 250% of the target amount, which varies depending on the target and Registrant’s performance against performance goals, which are determined by the Compensation Committee on the date of grant. As determined by the Compensation Committee, the performance awards granted during the years ended December 31, 2024, 2023 and 2022 included various performance-based conditions and one market-based condition related to total shareholder return (“TSR”) that will be earned based on Registrant’s TSR compared to the TSR for a specific peer group of investor-owned water companies. A summary of the status of Registrant’s outstanding performance awards to officers as of December 31, 2024, and changes during the year ended December 31, 2024, is presented below: Number of Weighted Average Performance awards at January 1, 2024 65,357 $ 87.35 Granted 28,503 73.16 Performance criteria adjustment 15,251 83.31 Vested (22,603) 79.54 Performance awards at December 31, 2024 86,508 $ 84.00 A portion of the fair value of performance awards was estimated at the grant date based on the probability of satisfying the market-based condition using a Monte-Carlo simulation model, which assesses the probabilities of various outcomes of the market condition. The portion of the fair value of the performance awards associated with performance-based conditions was based on the fair market value of AWR’s Common Shares at the grant date. The fair value of each outstanding performance award grant is amortized into compensation expense in installments of 33% the first two years and 34% in the third year of their respective vesting periods, which is generally over 3 years unless earlier vested pursuant to the terms of the agreement. The accrual of compensation costs is based on the estimate of the final expected value of the award and is adjusted as required for the portion based on the performance-based condition. Unlike the awards with performance-based conditions, for the portion based on the market-based condition, compensation cost is recognized, and not reversed, even if the market condition is not achieved, as required by the accounting guidance for share-based awards. As of December 31, 2024, $0.4 million of unrecognized compensation costs related to performance awards is expected to be recognized over a weighted average period of

Commitments

Commitments	12 Months Ended
	Dec. 31, 2024
Risks and Uncertainties [Abstract]
Commitments	Commitments GSWC’s Water Supply : GSWC has contracts to purchase water or water rights for an aggregate amount of $2.3 million as of December 31, 2024. Included in the $2.3 million is a commitment of $1.1 million to use water rights from a third party under an agreement, which expires in 2028. The remaining $1.2 million is for commitments for purchased water with other third parties, which expire from 2025 through 2038. GSWC’s estimated future minimum payments under these purchased water supply commitments at December 31, 2024 are as follows (in thousands): 2025 $ 459 2026 405 2027 405 2028 220 2029 87 Thereafter 718 Total $ 2,294 BVES Commitments : Purchase Power Contracts: In July 2023, the CPUC approved a new power purchase agreement between BVES and a third party to procure renewable portfolio standard (“RPS”) eligible energy and renewable energy credits as a bundled product. BVES began taking power under this long-term contract during the fourth quarter of 2024 to replace expired long-term fixed price contracts for purchase power over three . Renewables Portfolio Standard: BVES is subject to the renewables portfolio standard law, which requires BVES to meet certain targets for purchases of energy from qualified renewable energy resources. BVES had an agreement with a third party to purchase RECs whereby BVES agreed to purchase approximately 578,000 RECs over a ten-year period through 2035, which has been used towards BVES meeting California’s RPS requirements. On January 18, 2023, BVES filed a compliance report with the CPUC that covered pre-2023 compliance period, which did not reflect any RPS procurement deficiencies. BVES executed a contract in July 2023 with a third party to procure RPS eligible energy and RECs as a bundled product. The RECs under this agreement will be delivered following the year in which energy is purchased. BVES has agreed to purchase approximately 587,000 RECs over the eleven-year term of the contract. In addition, BVES has executed additional R EC purchase agreements that delivered in 2023 a total of 60,000 RECs with an additional 15,000 RECs delivered in 2024. As of December 31, 2024, BVES believes that it has purchased sufficient RECs to be in compliance through 2024 and management does not believe any provision for loss or potential penalties is required as of December 31, 2024. The cost of RECS are recorded to the electric supply cost balancing account when retired. BVES has commitments for RECs under contracts totaling $8.9 million as of December 31, 2024 . See Note 16 for Registrant’s future minimum payments under long-term non-cancelable operating leases.

Contingencies

Contingencies	12 Months Ended
	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies Environmental Clean-Up and Remediation at GSWC : GSWC has been involved in environmental remediation and cleanup at one of its plant sites that contained an underground storage tank, which was used to store gasoline for its vehicles. This tank was removed from the ground in July 1990 along with the dispenser and ancillary piping. Since then, GSWC has been involved in various remediation activities at this site. As of December 31, 2024, the total amount spent to clean-up and remediate the plant site, since inception of the remediation period, amounted to $6.8 million, of which $1.5 million has been paid by the State of California Underground Storage Tank Fund. Amounts paid by GSWC have been included in rate base and approved by the CPUC for recovery. As of December 31, 2024, GSWC has a regulatory asset and an accrued liability for the estimated remaining cost of $1.3 million to complete the cleanup at the site. The estimate includes costs for continued activities of groundwater cleanup and monitoring, future soil treatment and site-closure-related activities. The ultimate cost may vary as there are many unknowns in remediation of underground gasoline spills and this is an estimate based on currently available information. Management believes it is probable that the estimated additional costs will continue to be approved in rate base by the CPUC as approved historically. Contracted Services: Most of ASUS’s contract services are provided to the U.S. government pursuant to the terms of the initial 50-year, firm fixed-price contracts and additional firm fixed-price contracts subject to annual economic price adjustments, and one 15-year contract with the U.S. government . ASUS ’ s subsidiaries also, from time to time, perform construction services on military bases as a subcontractor or pursuant to a task order agreement. Entering into contracts with the U.S. government subjects ASUS and its subsidiaries to potential government audits or investigations of its business practices and compliance with government procurement statutes and regulations. Other Litigation : Registrant is also subject to other ordinary routine litigation incidental to its business, some of which may include claims for compensatory and punitive damages. Management believes that rate recovery, proper insurance coverage and reserves are in place to insure against, among other things, property, general liability, employment, and workers’ compensation claims incurred in the ordinary course of business. Insurance coverage may not cover certain claims involving punitive damages. Registrant does not believe the outcome from any pending suits or administrative proceedings will have a material effect on Registrant’s consolidated results of operations, financial position, or cash flows.

Leases

Leases	12 Months Ended
	Dec. 31, 2024
Leases [Abstract]
Leases	Leases Right-of-use (“ROU”) assets represent the right to use an underlying asset for the lease term, and lease liabilities represent the obligation to make lease payments arising from the lease. ROU assets and liabilities are recognized at the lease commencement date based on the estimated present value of lease payments over the lease term. As of December 31, 2024, Registrant has right-of-use assets of $8.0 million, short-term operating lease liabilities of $2.1 million and long-term operating lease liabilities of $6.4 million. Currently, Registrant does not have any financing leases. Significant assumptions and judgments made as pa rt of the lease standard include determining (i) whether a contract contains a lease, (ii) whether a contract involves an identified asset, and (iii) which party to the contract directs the use of the asset. The discount rates used to calculate the present value of lease payments were determined based on hypothetical borrowing rates available to Registrant over terms similar to the lease terms. Registrant’s leases consist of real estate and equipment leases, which are mostly GSWC’s. Most of Registrant’s leases require fixed lease payments. Some real estate leases have escalation payments which depend on an index. Variable lease costs were not material. Lease terms used to measure the lease liability include options to extend the lease if the option is reasonably certain to be exercised. Lease and non-lease components were combined to measure lease liabilities. Registrant’s supplemental lease information is as follows (in thousands, except for weighted average data): For The Year Ended December 31, 2024 For The Year Ended December 31, 2023 Operating lease costs $2,543 $2,486 Short-term lease costs $323 $147 Weighted average remaining lease term (in years) 3.87 4.55 Weighted-average discount rate 4.7% 4.0% Non-cash transactions Lease liabilities arising from obtaining right-of-use assets $2,210 $565 For the years 2024, 2023 and 2022, Registrant’s consolidated rent expense was approxim ately $2.6 million , $2.3 million and $2.6 million, respectively. Registrant’s future minimum payments under long-term non-cancelable operating leases as of December 31, 2024 are as follows (in thousands): 2025 $ 2,422 2026 2,373 2027 2,087 2028 1,786 2029 617 Thereafter — Total lease payments 9,285 Less: imputed interest 817 Total lease obligations 8,468 Less: current obligations 2,074 Long-term lease obligations $ 6,394 The consolidated operations of AWR and the operations of GSWC in regard to future minimum payments under long-term non-cancelable operating leases are not materially different.

Business Segments

Business Segments	12 Months Ended
	Dec. 31, 2024
Segment Reporting [Abstract]
Business Segments	Business Segments AWR has three reportable segments, water, electric and contracted services. GSWC has one segment, water. On a stand-alone basis, AWR has no material assets other than its equity investments in its subsidiaries, note payables to banks, deferred income taxes and intercompany note receivables. GSWC and BVES are CPUC regulated public utilities with business activities conducted in California. Activities of ASUS and its subsidiaries are conducted in California, Florida, Kansas, Maryland, Massachusetts, New Mexico, North Carolina, South Carolina, Texas and Virginia. Some of ASUS’s wholly owned subsidiaries are regulated by the state in which the subsidiary primarily conducts water and/or wastewater operations. Fees charged for operations and maintenance and renewal and replacement services are based upon the terms of the contracts with the U.S. government, which have been filed, as appropriate, with the commissions in the states in which ASUS’s subsidiaries are incorporated. In November 2023, the Financial Accounting Standards Board issued Accounting Standards Update 2023-07 (Segment Reporting: Improvements to Reportable Segment Disclosures). The new standard enhanced reportable segment disclosures and expanded the disclosures required for reportable segments in annual and interim consolidated financial statements, primarily through enhanced disclosures of significant segment expenses. Registrant adopted the new guidance of this standard on its segment disclosures and have applied the disclosures retrospectively to prior periods presented in the tables below. Registrant evaluates the performance of its reportable segments based on segment net income (loss). Registrant’s chief operating decision maker is the chief executive officer. The chief operating decision maker uses segment net income (loss) as a financial measure as part of the annual operating budget and forecasting process to monitor monthly financial activities of its segments. This financial information is reviewed and evaluated by the chief operating decision maker in making segment operating, capital, and business decisions. The following tables present information by reportable segment and AWR (parent) that reconcile segment net income (loss) to total consolidated net income (loss) and segment assets to total consolidated assets. The utility plant balances are net of respective accumulated provisions for depreciation. The net property, plant and equipment of the electric segment is presented net of Contributions in Aid of Construction (CIAC). Capital additions reflect capital expenditures paid in cash and exclude U.S. government-funded and third-party prime funded capital expenditures for ASUS’s subsidiaries and property installed by developers and conveyed to GSWC and BVES. For The Year Ended December 31, 2024 Total Contracted Reportable AWR Consolidated (dollars in thousands) Water Electric Services Segments Parent AWR Operating revenues $ 417,410 $ 51,645 $ 126,404 $ 595,459 $ — $ 595,459 Less: Supply costs 111,823 11,357 — 123,180 — 123,180 Other operation 28,349 3,424 9,545 41,318 — 41,318 Administrative and general 64,510 13,241 23,183 100,934 7 100,941 Depreciation and amortization expense (1) 37,187 3,160 3,300 43,647 — 43,647 Maintenance 9,788 5,901 4,566 20,255 — 20,255 Property and other taxes 22,233 2,399 2,459 27,091 — 27,091 ASUS construction expense — — 54,544 54,544 — 54,544 Segment operating income (loss) 143,520 12,163 28,807 184,490 (7) 184,483 Interest expense (38,532) (3,812) (2,166) (44,510) (5,872) (50,382) Interest income 6,018 976 782 7,776 98 7,874 Gain (loss) on investments held in a trust 5,293 — — 5,293 — 5,293 Income tax expense (benefit) 22,869 2,541 6,699 32,109 (1,936) 30,173 Other segment items income (expense) (2) 1,033 968 (82) 1,919 254 2,173 Segment net income (loss) 94,463 7,754 20,642 122,859 (3,591) 119,268 For The Year Ended December 31, 2024 Total Contracted Reportable AWR Consolidated (dollars in thousands) Water Electric Services Segments Parent AWR Capital additions (3) 197,355 29,980 4,625 231,960 — 231,960 For The Year Ended December 31, 2023 Total Contracted Reportable AWR Consolidated (dollars in thousands) Water Electric Services Segments Parent AWR Operating revenues $ 433,473 $ 41,832 $ 120,394 $ 595,699 $ — $ 595,699 Less: Supply costs 120,382 11,554 — 131,936 — 131,936 Other operation 29,064 4,057 7,150 40,271 — 40,271 Administrative and general 59,313 8,745 20,431 88,489 (216) 88,273 Depreciation and amortization expense (1) 35,886 3,256 3,261 42,403 — 42,403 Maintenance 9,906 924 3,388 14,218 — 14,218 Property and other taxes 19,845 2,100 2,101 24,046 — 24,046 ASUS construction expense — — 57,912 57,912 — 57,912 Other (100) — — (100) — (100) Segment operating income (loss) 159,177 11,196 26,151 196,524 216 196,740 Interest expense (31,283) (3,298) (2,127) (36,708) (6,054) (42,762) Interest income 5,557 1,060 806 7,423 (7) 7,416 Gain (loss) on investments held in a trust 5,008 — — 5,008 — 5,008 Income tax expense (benefit) 35,689 1,515 6,109 43,313 (1,714) 41,599 Other segment items income (expense) (2) (62) 36 (125) (151) 269 118 Segment net income (loss) 102,708 7,479 18,596 128,783 (3,862) 124,921 For The Year Ended December 31, 2023 Total Contracted Reportable AWR Consolidated (dollars in thousands) Water Electric Services Segments Parent AWR Capital additions (3) 160,939 25,372 2,229 188,540 — 188,540 The Year Ended December 31, 2022 Total Contracted Reportable AWR Consolidated (dollars in thousands) Water Electric Services Segments Parent AWR Operating revenues $ 340,602 $ 39,986 $ 110,940 $ 491,528 $ — $ 491,528 Less: Supply costs 98,228 11,682 — 109,910 — 109,910 Other operation 28,117 3,311 6,667 38,095 — 38,095 Administrative and general 58,358 7,901 19,923 86,182 8 86,190 Depreciation and amortization expense (1) 34,805 2,792 3,718 41,315 — 41,315 Maintenance 9,559 723 3,110 13,392 — 13,392 Property and other taxes 19,080 1,837 1,977 22,894 — 22,894 ASUS construction expense — — 53,171 53,171 — 53,171 Other — — (75) (75) — (75) Segment operating income (loss) 92,455 11,740 22,449 126,644 (8) 126,636 Interest expense (22,742) (1,225) (743) (24,710) (2,317) (27,027) Interest income 1,083 394 875 2,352 (26) 2,326 Gain (loss) on investments held in a trust (5,177) — — (5,177) — (5,177) Income tax expense (benefit) 16,346 2,439 5,476 24,261 (597) 23,664 Other segment items income (expense) (2) 4,497 406 141 5,044 258 5,302 Segment net income (loss) 53,770 8,876 17,246 79,892 (1,496) 78,396 The Year Ended December 31, 2022 Total Contracted Reportable AWR Consolidated (dollars in thousands) Water Electric Services Segments Parent AWR Capital additions (3) 146,730 18,069 1,441 166,240 — 166,240 ____________________________ (1) Depreciation computed on regulated utilities’ transportation equipment is recorded in other operating expenses and totaled $0.6 million, $0.9 million and $0.4 million for the years ended December 31, 2024, 2023 and 2022, respectively. (2) Other segment items primarily consist of a) non-service cost components related to GSWC’s benefit plans, and b) AFUDC on BVES capital projects. (3) Capital additions reflect capital expenditures paid in cash and exclude U.S. government-funded and third-party prime funded capital expenditures for ASUS's subsidiaries and property installed by developers and conveyed to GSWC and BVES. The following table reconciles segment net property, plant and equipment to total consolidated assets (in thousands): As Of December 31, 2024 Total Contracted Reportable AWR Less Consolidated Water Electric Services Segments Parent Eliminations AWR Total net property, plant and equipment (4) $ 1,911,369 $ 170,349 $ 17,907 $ 2,099,625 $ — $ — $ 2,099,625 Other assets 220,612 50,048 126,279 396,939 1,045,732 (1,042,087) 400,584 Total consolidated assets $ 2,131,981 $ 220,397 $ 144,186 $ 2,496,564 $ 1,045,732 $ (1,042,087) $ 2,500,209 As Of December 31, 2023 Total Contracted Reportable AWR Less Consolidated Water Electric Services Segments Parent Eliminations AWR Total net property, plant and equipment (4) $ 1,735,534 $ 140,279 $ 16,467 $ 1,892,280 $ — $ — $ 1,892,280 Other assets 180,621 35,241 133,863 349,725 922,901 (918,784) 353,842 Total consolidated assets $ 1,916,155 $ 175,520 $ 150,330 $ 2,242,005 $ 922,901 $ (918,784) $ 2,246,122 (4) The utility plant balances are net of respective accumulated provisions for depreciation.

Allowance for Doubtful Accounts

Allowance for Doubtful Accounts	12 Months Ended
	Dec. 31, 2024
Allowance for Doubtful Accounts
Allowance for Doubtful Accounts	Allowance for Doubtful Accounts Registrant’s allowance for doubtful accounts is developed based on expected credit losses and other considerations that may impact the customers’ ability to pay their bills. The estimate considers customer payment history and trends but also any COVID relief funds that Registrant received. The CPUC had authorized GSWC and BVES to track incremental costs including bad debt expense in excess of what is included in their respective revenue requirements and costs incurred as a result of the pandemic in COVID-19 related memorandum accounts to be filed with the CPUC for future recovery. In March 2024, as a result of the Extended Arrearage Program approved by the governor of California, GSWC received $3.5 million in COVID-19 relief funds from the State of California to provide assistance to customers for delinquent water customer bills incurred during the pandemic. In January 2022, GSWC received $9.5 million in COVID relief funds from the state of California through the initial California Water and Wastewater Arrearage Payment Program, which were applied to delinquent customers’ eligible balances incurred during the COVID-19 pandemic. During 2022, BVES received a total of $0.5 million from the state of California for similar relief funding for unpaid electric bills incurred during the pandemic. Pursuant to CPUC requirements, as of December 31, 2024, 2023 and 2022, GSWC and BVES reflected these relief funds as a reduction to its COVID-19 memorandum accounts, as well as a reduction to its estimated allowance for doubtful accounts. On April 10, 2023, the Biden Administration terminated the COVID-19 national emergency. The COVID-19 emergency-related memorandum accounts for GSWC and BVES expired when the COVID-19 national emergency ended. Other accounts receivable consist primarily of amounts due from third parties (non-utility customers) for various reasons, including amounts due from contractors, amounts due under settlement agreements, and amounts due from other third-party prime government contractors pursuant to agreements for construction of water and/or wastewater facilities for such third-party prime contractors. The table below presents Registrant’s provision for doubtful accounts charged to expense and accounts written off, net of recoveries. Provisions included in 2024, 2023 and 2022 for AWR and GSWC are as follows: AWR December 31, (dollars in thousands) 2024 2023 2022 Balance at beginning of year $ 3,590 $ 4,440 $ 3,569 Provision charged (1) 1,717 932 2,842 Accounts written off, net of recoveries (2) (1,629) (1,782) (1,971) Balance at end of year $ 3,678 $ 3,590 $ 4,440 Allowance for doubtful accounts related to accounts receivable-customer $ 3,568 $ 3,537 $ 4,387 Allowance for doubtful accounts related to other accounts receivable 110 53 53 Total allowance for doubtful accounts $ 3,678 $ 3,590 $ 4,440 (1) The 2022 balance includes amounts in excess of GSWC’s and BVES’s respective revenue requirements incurred during the COVID-19 pandemic. These incremental amounts were recorded as regulatory assets in the COVID-19 memorandum accounts. (2) Reflects consideration of government relief funds received in 2024 and 2022 from the state of California for unpaid water and electric utility bills incurred during the pandemic. In 2024, a total of $3.5 million was received for unpaid water bills. Additionally, in 2022, $9.5 million and $0.5 million was received for unpaid water and electric utility bills, respectively. GSWC December 31, (dollars in thousands) 2024 2023 2022 Balance at beginning of year $ 3,447 $ 4,196 $ 3,221 Provision charged (3) 1,366 754 2,501 Accounts written off, net of recoveries (4) (1,335) (1,503) (1,526) Balance at end of year $ 3,478 $ 3,447 $ 4,196 Allowance for doubtful accounts related to accounts receivable-customer $ 3,368 $ 3,394 $ 4,143 Allowance for doubtful accounts related to other accounts receivable 110 53 53 Total allowance for doubtful accounts $ 3,478 $ 3,447 $ 4,196 (3) The 2022 balance includes amounts in excess of GSWC’s revenue requirement incurred during the COVID-19 pandemic. This incremental amount was recorded as a regulatory asset in the COVID-19 memorandum account. (4)

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	12 Months Ended
	Dec. 31, 2024
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flow Information	Supplemental Cash Flow Information The following table sets forth non-cash financing and investing activities and other cash flow information (in thousands). AWR GSWC December 31, December 31, 2024 2023 2022 2024 2023 2022 Taxes and Interest Paid: Income taxes paid, net $ 27,850 $ 34,682 $ 27,370 $ 22,840 $ 31,625 $ 20,155 Interest paid, net of capitalized interest 50,347 39,367 26,005 37,994 28,099 22,294 Non-Cash Transactions: Accrued payables for investment in utility plant 49,600 34,906 40,034 44,256 33,465 38,302 Property installed by developers and conveyed 9,840 4,690 1,549 9,840 4,690 1,549

SCHEDULE I - CONDENSED FINANCIA

SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT	12 Months Ended
	Dec. 31, 2024
Condensed Financial Information Disclosure [Abstract]
SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT	CONDENSED BALANCE SHEETS December 31, (in thousands) 2024 2023 Assets Cash and equivalents $ 5,913 $ 3,547 Prepayments and other current assets — 116 Income taxes receivable 51 39 Intercompany note receivables 22,004 39,044 Total current assets 27,968 42,746 Investments in subsidiaries 1,006,781 870,020 Deferred taxes and other assets 10,983 10,135 Total assets $ 1,045,732 $ 922,901 Liabilities and Capitalization Income taxes payable 3,281 2,422 Other liabilities 235 577 Total current liabilities 3,516 2,999 Notes payable to bank 120,000 141,500 Deferred taxes and other liabilities 2,165 2,293 Total other liabilities 122,165 143,793 Common shareholders’ equity 920,051 776,109 Total capitalization 920,051 776,109 Total liabilities and capitalization $ 1,045,732 $ 922,901 The accompanying condensed notes are an integral part of these condensed financial statements. CONDENSED STATEMENTS OF INCOME For the Years Ended December 31, (In thousands, except per share amounts) 2024 2023 2022 Operating revenues and other income $ — $ — $ — Operating expenses and other expenses 5,527 5,576 2,093 Loss before equity in earnings of subsidiaries and income taxes (5,527) (5,576) (2,093) Equity in earnings of subsidiaries 122,859 128,783 79,892 Income before income taxes 117,332 123,207 77,799 Income tax benefit (1,936) (1,714) (597) Net income $ 119,268 $ 124,921 $ 78,396 Weighted Average Number of Common Shares Outstanding 37,464 36,976 36,955 Basic Earnings Per Common Share $ 3.17 $ 3.37 $ 2.12 Weighted Average Number of Diluted Common Shares Outstanding 37,583 37,077 37,039 Fully Diluted Earnings per Common Share $ 3.17 $ 3.36 $ 2.11 Dividends Paid Per Common Share $ 1.791 $ 1.655 $ 1.525 The accompanying condensed notes are an integral part of these condensed financial statements. CONDENSED STATEMENTS OF CASH FLOWS For the Years Ended December 31, (in thousands) 2024 2023 2022 Cash Flows From Operating Activities $ 47,069 $ 67,041 $ 56,398 Cash Flows From Investing Activities: Loans (made to)/repaid from, wholly-owned subsidiaries 17,000 121,000 (81,000) Increase in investment of subsidiary (62,000) (10,000) — Net cash provided (used) by investing activities (45,000) 111,000 (81,000) Cash Flows From Financing Activities: Proceeds from issuance of Common Shares, net of issuance costs 88,814 — — Net changes in notes payable to banks (21,500) (113,392) 81,000 Dividends paid (67,017) (61,195) (56,356) Net cash provided (used) by financing activities 297 (174,587) 24,644 Net change in cash and cash equivalents 2,366 3,454 42 Cash and equivalents at beginning of period 3,547 93 51 Cash and equivalents at the end of period $ 5,913 $ 3,547 $ 93 The accompanying condensed notes are an integral part of these condensed financial statements. Note 1 — Basis of Presentation The accompanying condensed financial statements of AWR (parent) should be read in conjunction with the consolidated financial statements and notes thereto of American States Water Company and subsidiaries (“Registrant”) included in Part II, Item 8 of this Form 10-K. AWR’s (parent) significant accounting policies are consistent with those of Registrant and its wholly owned subsidiaries, Golden State Water Company (“GSWC”), Bear Valley Electric Service, Inc. (“BVES”) and American States Utility Services, Inc. (“ASUS”), except that all subsidiaries are accounted for as equity method investments. Related-Party Transactions: As further discussed in Note 2 — Notes Payable to Banks , AWR (parent) currently has access to a $165.0 million syndicated credit facility. AWR (parent) borrows under this facility and provides funds to ASUS in support of their operations and itself. Prior to the new credit agreement executed in June 2023, described below, AWR (parent) had a credit facility with borrowing capacity of up to $280.0 million and had provided funds to both GSWC and ASUS in support of their operations. Any amounts owed to AWR (parent) for borrowings under this facility are reflected as intercompany note receivables on the Condensed Balance Sheets. The interest rate charged to its subsidiaries is sufficient to cover AWR (parent)’s interest cost under the credit facility. AWR may, from time to time, also make equity investments in its subsidiaries in support of their operations as described below. On December 30, 2024, GSWC issued 2.7586 Common Shares to AWR for total proceeds of approximately $40.0 million. GSWC used the proceeds from the stock issuance to pay down outstanding borrowings under its revolving credit facility and to fund its operations and capital expenditures. In September 2024, BVES issued eleven Common Shares to AWR for total proceeds of $22.0 million. BVES used the proceeds from the stock issuance to pay down outstanding borrowings under its revolving credit facility and to fund its operations and capital expenditures. In January 2023, GSWC issued one Common Share to AWR (parent) for $10.0 million. In January 2023, GSWC issued $130.0 million in unsecured long-term notes in a private placement. GSWC used the proceeds from both the issuance of equity and long-term debt to pay-off all intercompany borrowings from AWR (parent). AWR (parent) guarantees performance of ASUS’s contracts with the U.S. government and agrees to provide necessary resources, including financing, which are necessary to assure the complete and satisfactory performance of such contracts. Note 2 — Note Payable to Banks On June 28, 2023, AWR (parent) entered into a new credit agreement with a term of five AWR’s new credit agreement provided for a $150.0 million unsecured revolving credit facility to support AWR (parent) and ASUS. Under AWR’s credit agreement, the borrowing capacity may be expanded up to an additional amount of $75 million, subject to the lenders’ approval. On November 6, 2023, AWR’s credit facility was amended to increase the borrowing capacity from $150.0 million to $165.0 million to provide additional support to ASUS and AWR (parent). In connection with the increase in borrowing capacity, the amendment also provides for the addition of a new bank to the existing syndicate group participating in AWR’s credit facility. The aggregate amount that may be outstanding under letters of credit is $10.0 million. Loans may be obtained under the credit facilities at the option of AWR (parent) and bear interest at rates based on either a base rate plus an applicable margin or an adjusted term SOFR determined by the SOFR administrator, currently the Federal Reserve Bank of New York, plus an applicable margin. The applicable margin depends upon AWR’s credit ratings. As of December 31, 2024, outstanding borrowings under its credit facility of $120.0 million have been classified as a non-current liability on its Condensed Balance Sheet. The credit agreement contains affirmative and negative covenants and events of default customary for credit facilities of this type, including, among other things, affirmative covenants relating to compliance with law and material contracts, and negative covenants relating to additional indebtedness, liens, investments, restricted payments and asset sales by AWR (parent) and its subsidiaries, other than BVES. AWR (parent) is not permitted to have a consolidated total capitalization ratio (as defined in the credit agreement), excluding BVES, greater than 0.65 to 1.00 at the end of any quarter. Default under any indebtedness of any subsidiary of AWR (parent), other than BVES, will result in a default under its credit agreement. As of December 31, 2024, AWR (parent) had a debt ratio of 0.51 to 1.00. AWR (parent)'s borrowing activities (excluding letters of credit) for the years ended December 31, 2024 and 2023 were as foll ows: December 31, (in thousands, except percent) 2024 2023 Balance Outstanding at December 31, $ 120,000 $ 141,500 Interest Rate at December 31, 5.44 % 6.45 % Average Amount Outstanding $ 122,896 $ 156,533 Weighted Average Annual Interest Rate 6.29 % 5.92 % Maximum Amount Outstanding $ 145,500 $ 257,500 Note 3 — Income Taxes AWR (parent) receives a tax benefit for expenses incurred at the parent-company level. AWR (parent) also recognizes the effect of AWR’s consolidated California unitary apportionment, which is beneficial or detrimental depending on a combination of the profitability of AWR’s consolidated non-California activities as well as the proportion of its consolidated California sales to total sales. Note 4 — Dividend from Subsidiaries Cash dividends in the amounts of $51.1 million , $71.4 million and $56.4 million were paid to AWR (parent) by its wholly owned subsidiaries during the years ended December 31, 2024, 2023 and 2022, respectively.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pay vs Performance Disclosure
Net Income	$ 119,268	$ 124,921	$ 78,396

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Insider Trading Policies and Pr

Insider Trading Policies and Procedures	12 Months Ended
	Dec. 31, 2024
Insider Trading Policies and Procedures [Line Items]
Insider Trading Policies and Procedures Adopted	true

Cybersecurity Risk Management a

Cybersecurity Risk Management and Strategy Disclosure	12 Months Ended
	Dec. 31, 2024
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]	Cyberattacks represent a threat to water, wastewater and electric utility systems. There have also been increasing threats to the information that companies maintain that have resulted in unauthorized disclosure of private customer, employee, director and corporate financial information. Threats can come from many sources, including, but not limited to, ransomware, malicious software, credential loss or theft, supervisory control and data acquisition system takeover, equipment theft, supply chain attacks, phishing attacks, identity-based attacks, denial-of-service attacks or the actions of employees either intentional or accidental. Ransomware whereby hackers take control of a company’s systems and/or data has been identified as the most significant threat to Registrant’s critical infrastructure systems and is getting harder to detect and encrypted files are becoming harder to recover. Threat actors using ransomware have also increased their use of data, not only for direct ransom and data destruction, but also to release the data to the public. Registrant believes a breach of customer personally identifiable information is one of the most significant financial risks to it as the costs incurred could exceed the amount of its cybersecurity insurance coverage. Nevertheless, in order to continue meeting Registrant’s technological business needs and as more vendors build solutions in the cloud, Registrant expects to further expand its use of cloud-computing environments. As such, Registrant expects risks from cyberattacks and data breaches to increase due to the growth of its technological footprint in the cloud environments. As cyberattacks have become more frequent and sophisticated, including against third-party technology providers, Registrant expects to continue to increase its investment in information and operational technology to monitor and address cyber threats and attempted cyberattacks, and to improve its posture in addressing security vulnerabilities. Registrant has implemented robust cybersecurity systems and controls to prevent any unauthorized access to information. Its platform was designed to be consistent with industry best practices such as the U.S. National Institute of Standards and Technology (“NIST”) cybersecurity frameworks. In addition, Registrant has dedicated employees with cybersecurity technical expertise and also leverages outside cybersecurity firms. Registrant has adopted multi-layered safeguards and educational measures to protect its operations, assets and digital information. Registrant conducts mandatory quarterly cybersecurity training for all employees. Registrant also conducts specialized training for ASUS employees annually on protecting certain types of information relating to the work ASUS and its subsidiaries do with the U.S. government to comply with U.S. government contracting requirements. In addition, Registrant conducts periodic and unannounced phishing tests with all employees and vulnerability assessment and penetration tests. Registrant has adopted a cybersecurity incident response policy, plan and set of specific instructions, which are annually reviewed by the IT cybersecurity team members. Registrant is also taking actions intended to strengthen its cybersecurity posture and to improve its cybersecurity incident response plans and operating procedures. Despite the actions Registrant has taken and is taking and the fact that, to its knowledge, it has yet to experience a cybersecurity incident, there can be no assurance that Registrant will not experience a cybersecurity incident. Risk management, oversight and response Cyber risk management is an ongoing iterative process that requires continuous identification, assessment and management of possible cyber threats and has become a vital part of Registrant’s overall risk management efforts. Registrant’s cybersecurity team assesses ongoing cybersecurity threats and vulnerabilities to prioritize and implement mitigation factors and defense to help contain and combat identified risks. To keep threat and vulnerability information up-to-date, the cybersecurity team subscribes to multiple national and state-level threat and vulnerability information disclosure services, both general-purpose and industry-specific in nature. Updates from these sources include general information delivered on a daily basis and more threat-specific information delivered as required. Tools are in place within Registrant’s environment to monitor for anomalous behavior and provide rapid alerting for emerging threats and, in some cases, automated responses to threats. Registrant’s cybersecurity team meets regularly with product vendors for these tools to ensure optimal configurations are in place to protect its environment. To determine the risk to Registrant’s systems, it engages in a continuous vulnerability management lifecycle process to identify and remediate vulnerable systems and system configurations. In this regard, Registrant leverages the NIST cybersecurity frameworks. To supplement Registrant’s internal process, the cybersecurity team regularly contracts consultants to assess system configurations, both passively through exercises such as configuration review and actively through penetration testing, and response procedures, such as tabletop exercises, to identify areas for improvement. In addition, Registrant supplements its day-to-day operations with around the clock identification, assessment and mitigation of cyber risks with third-party security services as well. Registrant is working on implementing across AWR and its subsidiaries a comprehensive, risk-based approach to identify and oversee cybersecurity risks presented by third parties, including vendors, service providers and other external users of its systems and data, as well as the systems of third parties that could adversely impact Registrant’s business in the event of a cybersecurity incident affecting those third-party systems.
Cybersecurity Risk Management Processes Integrated [Flag]	true
Cybersecurity Risk Management Processes Integrated [Text Block]	Registrant has implemented robust cybersecurity systems and controls to prevent any unauthorized access to information. Its platform was designed to be consistent with industry best practices such as the U.S. National Institute of Standards and Technology (“NIST”) cybersecurity frameworks. In addition, Registrant has dedicated employees with cybersecurity technical expertise and also leverages outside cybersecurity firms. Registrant has adopted multi-layered safeguards and educational measures to protect its operations, assets and digital information. Registrant conducts mandatory quarterly cybersecurity training for all employees. Registrant also conducts specialized training for ASUS employees annually on protecting certain types of information relating to the work ASUS and its subsidiaries do with the U.S. government to comply with U.S. government contracting requirements. In addition, Registrant conducts periodic and unannounced phishing tests with all employees and vulnerability assessment and penetration tests. Registrant has adopted a cybersecurity incident response policy, plan and set of specific instructions, which are annually reviewed by the IT cybersecurity team members. Registrant is also taking actions intended to strengthen its cybersecurity posture and to improve its cybersecurity incident response plans and operating procedures. Despite the actions Registrant has taken and is taking and the fact that, to its knowledge, it has yet to experience a cybersecurity incident, there can be no assurance that Registrant will not experience a cybersecurity incident.
Cybersecurity Risk Management Third Party Engaged [Flag]	true
Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]	true
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]	false
Cybersecurity Risk Board of Directors Oversight [Text Block]	Registrant’s Board of Directors (the “Board”) oversees enterprise risk management, or ERM, performed under the direction of Registrant’s senior management team. Cybersecurity updates, including recent findings, changes to processes or personnel changes, are provided to the ERM liaison to the Board, who is a member of the Board, and to the full Board on a quarterly basis or more frequently if needed. Cybersecurity is one component of an overall ERM framework that involves Registrant’s Board. The Board satisfies its oversight responsibility by obtaining information from the ERM liaison and senior management of Registrant, with input from the senior management of Registrant’s subsidiaries as necessary.
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]	Cybersecurity updates, including recent findings, changes to processes or personnel changes, are provided to the ERM liaison to the Board, who is a member of the Board, and to the full Board on a quarterly basis or more frequently if needed. Cybersecurity is one component of an overall ERM framework that involves Registrant’s Board.
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]	On a quarterly basis, Registrant’s senior management will discuss plans to mitigate cybersecurity risks with the ERM liaison. The ERM liaison and Registrant’s senior management will then provide a report to the full Board regarding the critical cybersecurity risks discussed, mitigation plans and implementation of the ERM program that addresses cybersecurity risks.
Cybersecurity Risk Role of Management [Text Block]	In addition, Registrant’s plans require members of its senior management, such as its CEO and CFO, as well as members of management from its, and its subsidiaries’, Operations, Information Technology, Human Capital Management, Accounting and Legal teams to participate in Registrant’s Cybersecurity Incident Response Team (“CIRT”) and to be kept current on all aspects related to a cyberattack, if a cybersecurity incident were to occur. Responses to cyberattacks are fast-moving and dynamic and would require an assessment of actual or potential damage performed by Registrant’s cybersecurity team. If a cyberattack were to occur, continuous engagement, communication and collaboration between Registrant’s cybersecurity team and members of its CIRT as well as third parties would likely be necessary in order to gather accurate and complete information, perform a comprehensive evaluation and assessment of the cyberattack, manage and contain the cybersecurity threat, and develop and execute a remediation and recovery plan. Members of its CIRT team would work together to determine whether a cybersecurity breach is material and required to be reported to the Board and publicly under applicable law and regulation.
Cybersecurity Risk Management Positions or Committees Responsible [Flag]	true
Cybersecurity Risk Management Positions or Committees Responsible [Text Block]	In addition, Registrant’s plans require members of its senior management, such as its CEO and CFO, as well as members of management from its, and its subsidiaries’, Operations, Information Technology, Human Capital Management, Accounting and Legal teams to participate in Registrant’s Cybersecurity Incident Response Team (“CIRT”) and to be kept current on all aspects related to a cyberattack, if a cybersecurity incident were to occur.
Cybersecurity Risk Management Expertise of Management Responsible [Text Block]	Registrant’s CFO has over 15 years overseeing the Company’s risk management area. Registrant’s IT Director has over 25 years in Information Technology designing, implementing and supporting various cybersecurity and technical solutions, along with ensuring compliance with multiple cybersecurity regulations.
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]	To ensure that members of Registrant’s Board are informed of material cyberattacks, Registrant’s CFO and IT Director have been designated as key members of management that will provide current updates to Registrant’s ERM liaison and the Board. The communication will include but not be limited to, the nature and status of the cyberattack and Registrant’s plan to contain and mitigate the cyber threat and ultimately the remediation and recovery plan to return to “business as usual” state.
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]	true

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Basis of Accounting, Policy	Nature of Operations : American States Water Company (“AWR”) is the parent company of Golden State Water Company (“GSWC”), Bear Valley Electric Service Inc. (“BVES”), and American States Utility Services, Inc. (“ASUS”) (and its subsidiaries, Fort Bliss Water Services Company (“FBWS”), Old Dominion Utility Services, Inc. (“ODUS”), Terrapin Utility Services, Inc. (“TUS”), Palmetto State Utility Services, Inc. (“PSUS”), Old North Utility Services, Inc. (“ONUS”), Emerald Coast Utility Services, Inc. (“ECUS”), Fort Riley Utility Services, Inc. (“FRUS”), Bay State Utility Services LLC (“BSUS”), and Patuxent River Utility Services LLC (“PRUS”)). AWR and its subsidiaries may be collectively referred to as “Registrant” or “the Company.” AWR, through its wholly owned subsidiaries, serves over one million people in ten states. GSWC and BVES are both California public utilities. GSWC engages in the purchase, production, distribution and sale of water throughout California serving approximately 264,600 customer connections. BVES distributes electricity in several San Bernardino County mountain communities in California serving approximately 24,900 customer connections. The California Public Utilities Commission (“CPUC”) regulates GSWC’s and BVES’s businesses in matters including properties, rates, services, facilities, and transactions between GSWC, BVES, and their affiliates. ASUS, through its wholly owned subsidiaries, operates, maintains and performs construction activities (including renewal and replacement capital work) on water and/or wastewater systems at various U.S. military bases pursuant to initial 50-year firm fixed-price contracts with the U.S. government and one 15 -year contract with the U.S. government. These contracts are subject to annual economic price adjustments and modifications for changes in circumstances, changes in laws and regulations, and additions to the contract value for new construction of facilities at the military bases. ASUS also from time to time performs construction services on military bases as a subcontractor. There is no direct regulatory oversight by the CPUC over AWR or the operations, rates or services provided by ASUS or any of its wholly owned subsidiaries. Basis of Presentation : The consolidated financial statements and notes thereto are presented in a combined report filed by two separate Registrants: AWR and GSWC. References in this report to “Registrant” are to AWR and GSWC, collectively, unless otherwise specified. AWR owns all of the outstanding common shares of GSWC, BVES and ASUS. ASUS owns all of the outstanding common shares of its subsidiaries. The consolidated financial statements of AWR include the accounts of AWR and its subsidiaries. These financial statements are prepared in conformity with accounting principles generally accepted in the United States of America. Intercompany transactions and balances have been eliminated in the AWR consolidated financial statements.
Related Party Transactions	Related-Party and Intercompany Transactions : As discussed in Note 9, prior to AWR and GSWC entering into new separate credit agreements in June 2023 that replaced AWR’s previous credit agreement, AWR borrowed under its credit facility and provided funds to both GSWC and ASUS in support of their operations. Under AWR’s current credit facility, AWR borrows and continues to provide funds to ASUS in support of its operations, through an intercompany borrowing agreement, and AWR (parent). The interest rate charged to ASUS is sufficient to cover AWR’s interest expense under the credit facility. GSWC’s credit facility provides support for its water operations. BVES has a separate credit facility and has also issued long-term debt to support its operations. Furthermore, GSWC, BVES and ASUS provide and/or receive various support services to and from their parent, AWR, and among themselves. GSWC allocates certain corporate office administrative and general costs to its affiliates, BVES and ASUS, using allocation factors approved by the CPUC. During the years ended December 31, 2024, 2023 and 2022, GSWC allocated to ASUS $5.3 million , $5.0 million and $5.2 million, respectively, of corporate office administrative and general costs. During the years ended December 31, 2024, 2023 and 2022, GSWC allocated corporate office administrative and general costs to BVES of $3.2 million , $3.5 million and $2.7 million, respectively. When necessary, AWR will make capital contributions to its regulated utilities in order to manage to the CPUC-authorized capital structure. In September 2024, BVES issued eleven Common Shares to AWR for total proceeds of $22.0 million. BVES used the proceeds from the stock issuance to pay down outstanding borrowings under its revolving credit facility and to fund its operations and capital expenditures. AWR made capital contributions to GSWC in 2024 and 2023 (Note 7).
Utility Accounting	Utility Accounting : Registrant’s accounting policies conform to accounting principles generally accepted in the United States of America (“GAAP”), including the accounting principles for rate-regulated enterprises, which reflect the ratemaking policies of the CPUC and, to the extent applicable, the Federal Energy Regulatory Commission (“FERC”). GSWC and BVES have incurred various costs and received various credits reflected as regulatory assets and liabilities. Accounting for such costs and credits as regulatory assets and liabilities is in accordance with the guidance for accounting for the effects of certain types of regulation. This guidance sets forth the application of GAAP for those companies whose rates are established by or are subject to approval by an independent third-party regulator. Under such accounting guidance, rate-regulated entities defer costs and credits on the balance sheet as regulatory assets and liabilities when it is probable that those costs and credits will be recognized in the ratemaking process in a period different from the period in which they would have been reflected in income by an unregulated company. These regulatory assets and liabilities are then recognized in the income statement in the period in which the same amounts are reflected in the rates charged for service. The amounts included as regulatory assets and liabilities that will be collected or refunded over a period exceeding one year are classified as long-term assets and liabilities as of December 31, 2024 and 2023. Regulatory assets are reviewed for recoverability each reporting period. If a regulatory asset is no longer deemed probable of recovery, the deferred cost is charged to earnings.
Property and Depreciation	Property and Depreciation : Registrant’s property consists primarily of regulated utility plant at GSWC and BVES. GSWC and BVES capitalize, as utility plant, the cost of construction and the cost of additions, betterments and replacements of retired units of property. Such costs include labor, material and certain indirect costs. Indirect costs are allocated to each project based on total costs. Water systems acquired are recorded at estimated original cost of utility plant when first devoted to utility service and the applicable depreciation is recorded to accumulated depreciation. Any difference between the estimated original cost, less accumulated depreciation, and the purchase price, if recognized by the CPUC, is recorded as an acquisition adjustment within utility plant. Depreciation for the regulated utilities is computed on the straight-line, remaining-life basis, group method, in accordance with the applicable ratemaking process. The provision for depreciation expressed as a percentage of the aggregate depreciable asset balances for regulated utilities was approximately 2% fo r each of the years 2024, 2023 and 2022. Depreciation expense for regulated utilities, excluding amortization expense and depreciation on transportation equipment, totale d $39.8 million, $38.3 million and $37.3 million for the years ended December 31, 2024, 2023 and 2022, respectively. Depreciation computed on regulated utilities’ transportation equipment is recorded in other operating expenses and totaled $0.6 million , $0.9 million and $0.4 million for the years 2024, 2023 and 2022, respectively. For the year ended December 31, 2023, approximately $0.2 million of additional depreciation expense on GSWC's transportation equipment was recorded that relates to the cumulative retroactive impact for the full year of 2022 approved in the final CPUC decision in GSWC's general rate case that resulted from an increase to the transportation equipment composite depreciation rates that are retroactive to January 1, 2022. Expenditures for maintenance and repairs are expensed as incurred. Retired property costs, including costs of removal, are charged to the accumulated provision for depreciation. Estimated useful lives of regulated utilities’ utility plant, as authorized by the CPUC, are as follows: Source of water supply 20 years to 60 years Pumping 26 years to 41 years Water treatment 26 years to 32 years Transmission and distribution 15 years to 80 years Generation 40 years Other plant 5 years to 62 years Non-regulated property consists primarily of equipment utilized by ASUS and its subsidiaries for its operations. This property is stated at cost, net of accumulated depreciation, which is calculated using the straight-line method over the useful lives of the assets.
Asset Retirement Obligation	Asset Retirement Obligations : GSWC has a legal obligation for the retirement of its wells, which by law need to be properly capped at the time of removal. As such, GSWC incurs asset retirement obligations. GSWC records the fair value of a liability for these asset retirement obligations in the period in which they are incurred. When the liability is initially recorded, GSWC capitalizes the cost by increasing the carrying amount of the related long-lived asset. Over time, the liability is accreted to its present value each period, and the capitalized cost is depreciated over the useful life of the related asset. Upon settlement of the liability, GSWC either settles the obligation for its recorded amount or incurs a gain or loss upon settlement. Retirement costs have historically been recovered through rates subsequent to the retirement costs being incurred. Accordingly, recoverability of GSWC’s asset retirement obligations are reflected as a regulatory asset (Note 3). GSWC also reflects the loss or gain at settlement as a regulatory asset or liability on the balance sheet. With regards to removal costs associated with certain other long-lived assets, such as water mains, distribution and transmission assets, asset retirement obligations have not been recognized as GSWC believes there is no legal obligation to do so. There are no CPUC rules or regulations that require GSWC to remove any of its other long-lived assets. In addition, GSWC’s water pipelines are not subject to regulation by any federal regulatory agency. GSWC has franchise agreements with various municipalities in order to use the public right of way for utility purposes (i.e., operate water distribution and transmission assets), and if certain events occur in the future, GSWC could be required to remove or relocate certain of its pipelines. However, it is not possible to estimate an asset retirement amount since the timing and the amount of assets that may be required to be removed, if any, is not known.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets : Long-lived assets are reviewed for impairment when events or changes in circumstances indicate that the carrying amount of an asset may not be fully recoverable in accordance with accounting guidance for impairment or disposal of long-lived assets. Impairment evaluation is based on a review of estimated future cash flows expected to be generated and if the carrying amount of a long-lived asset exceeds expected future cash flows, an impairment loss is recognized in the amount of the excess of fair value over the carrying amount. Registrant would recognize an impairment loss on its regulated assets only if the carrying value amount of a long-lived asset is not recoverable from customer rates authorized by the CPUC. Impairment loss is measured as the excess of the carrying value over the amounts recovered in customer rates. For the years ended December 31, 2024, 2023 and 2022, no impairment loss was incurred.
Goodwill	Goodwill : At December 31, 2024 and 2023, AWR had $1.1 million of goodwill. Goodwill is included in Non-current Other Assets on the Consolidated Balance Sheets. The goodwill arose from ASUS’s acquisition of a subcontractor’s business at some of its subsidiaries. In accordance with the accounting guidance for testing goodwill, AWR annually assesses qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. For 2024 and 2023, AWR’s assessment of qualitative factors did not indicate that an impairment had occurred for goodwill at ASUS.
Cash and Cash Equivalents	Cash and Cash Equivalents
Accounts Receivable	Accounts Receivable : Accounts receivable is reported on the balance sheet net of any allowance for doubtful accounts. The allowance for doubtful accounts is Registrant’s best estimate of the amount of probable credit losses in Registrant’s existing accounts receivable from its water and electric customers, and is determined based on expected losses rather than incurred losses. Registrant reviews the allowance for doubtful accounts quarterly. Account balances are written off against the allowance when it is probable the receivable will not be recovered. When utility customers request extended payment terms, credit is extended based on regulatory guidelines, and collateral is not required.
Materials and Supplies	Materials and Supplies
Interest	Interest : Interest incurred during the construction of capital assets has generally not been capitalized for financial reporting purposes as such policy is not followed in the ratemaking process. Interest expense is generally recovered through the regulatory process. At times, the CPUC has authorized certain capital projects to be filed for revenue recovery with advice letters when those projects are completed. During the time that such projects are under development and construction, GSWC or BVES may record an allowance for funds used during construction (“AFUDC”) as a component of construction work in progress to offset the cost of financing project construction if allowed by the regulator. After construction is completed, GSWC and BVES is permitted to recover these costs through the inclusion in rate base. For the year ended December 31, 2024 and 2022, BVES recorded $1.3 million and $0.1 million in AFUDC, respectively. The amount recorded in 2023 was insignificant. As a result of receiving the final decision on BVES’s general rate case (Note 3), BVES recorded $1.3 million
Debt Issuance Costs and Redemption Premiums	Debt Issuance Costs and Redemption Premiums
Advance for Construction and Contributions in Aid	Advances for Construction and Contributions in Aid of Construction
Fair Value of Financial Instruments, Policy	Fair Value of Financial Instruments : For cash and cash equivalents, accounts receivable, accounts payable and short-term debt, the carrying amount is assumed to approximate fair value due to the short-term nature of the amounts. The table below estimates the fair value of long-term debt held by AWR and GSWC, respectively. Rates available to AWR and GSWC at December 31, 2024 and 2023 for debt with similar terms and remaining maturities were used to estimate fair value for long-term debt. Changes in the assumptions will produce differing results. 2024 2023 (dollars in thousands) Carrying Amount Fair Value Carrying Amount Fair Value Long-term debt—AWR (1)(2) $ 643,893 $ 608,184 $ 579,047 $ 556,214 2024 2023 (dollars in thousands) Carrying Amount Fair Value Carrying Amount Fair Value Long-term debt—GSWC (1) $ 608,893 $ 575,749 $ 544,047 $ 522,883 (1) Excludes debt issuance costs and redemption premiums. (2) Includes debt held by BVES of $35.0 million as of December 31, 2024 and 2023 , respectively. The accounting guidance for fair value measurements applies to all financial assets and financial liabilities that are being measured and reported on a fair value basis. Under the accounting guidance, Registrant has made fair value measurements that are classified and disclosed in one of the following three categories: Level 1 : Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities; Level 2 : Quoted prices in markets that are not active or inputs which are observable, either directly or indirectly, for substantially the full term of the asset or liability; or Level 3 : Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported by little or no market activity). Registrant makes fair value measurements on its publicly issued notes, private placement notes and other long-term debt using current U.S. corporate debt yields for similar debt instruments. Under the fair value guidance, these are classified as Level 2, which consists of quoted prices in markets that are not active, or inputs which are observable, either directly or indirectly, for substantially the full term of the asset or liability. The following table sets forth by level, within the fair value hierarchy, Registrant’s long-term debt measured at fair value as of December 31, 2024: (dollars in thousands) Level 1 Level 2 Level 3 Total Long-term debt—AWR — $ 608,184 — $ 608,184 (dollars in thousands) Level 1 Level 2 Level 3 Total Long-term debt—GSWC — $ 575,749 — $ 575,749
Stock-Based Awards	Stock-Based Awards : AWR has issued stock-based awards to its employees under stock incentive plans. AWR has also issued stock-based awards to its Board of Directors under non-employee directors stock plans. Registrant applies the provisions in the accounting guidance for share-based payments in accounting for all of its stock-based awards. See Note 13 for further discussion.
New Accounting Pronouncements, Policy	New Accounting Guidance : Adopted in 2024 : In November 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update 2023-07 (Segment Reporting: Improvements to Reportable Segment Disclosures). The new standard enhances reportable segment disclosures and expands the disclosures required for reportable segments in annual and interim consolidated financial statements, primarily through enhanced disclosures of significant segment expenses. The adoption of the new guidance resulted in enhanced disclosure of Registrant's significant segment expenses, as discussed in Note 17. Not Yet Adopted: In December 2023, the FASB issued Accounting Standards Update 2023-09 (Improvements to Income Tax Disclosures) requiring public entities to provide more disclosures primarily related to the income tax rate reconciliation and income taxes paid. The guidance also eliminates certain existing disclosure requirements related to uncertain tax positions and unrecognized deferred tax liabilities. The guidance will be effective January 1, 2025 with early adoption permitted. The guidance is applied prospectively and Registrant is currently evaluating the impact of this standard on its income tax disclosures. In November 2024, the FASB issued Accounting Standards Update 2024-03, (Disaggregation of Income Statement Expenses) requiring public entities to disclose additional information about specific expense categories in the notes to the financial statements on an interim and annual basis. The guidance will be effective for fiscal years beginning after December 15, 2026, and for interim periods beginning after December 15, 2027, with early adoption permitted. Registrant is currently evaluating the impact of adopting this standard.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Public Utility Property, Plant, and Equipment	Estimated useful lives of regulated utilities’ utility plant, as authorized by the CPUC, are as follows: Source of water supply 20 years to 60 years Pumping 26 years to 41 years Water treatment 26 years to 32 years Transmission and distribution 15 years to 80 years Generation 40 years Other plant 5 years to 62 years
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments	Rates available to AWR and GSWC at December 31, 2024 and 2023 for debt with similar terms and remaining maturities were used to estimate fair value for long-term debt. Changes in the assumptions will produce differing results. 2024 2023 (dollars in thousands) Carrying Amount Fair Value Carrying Amount Fair Value Long-term debt—AWR (1)(2) $ 643,893 $ 608,184 $ 579,047 $ 556,214 2024 2023 (dollars in thousands) Carrying Amount Fair Value Carrying Amount Fair Value Long-term debt—GSWC (1) $ 608,893 $ 575,749 $ 544,047 $ 522,883 (1) Excludes debt issuance costs and redemption premiums. (2) Includes debt held by BVES of $35.0 million as of December 31, 2024 and 2023 , respectively.
Fair Value, Liabilities Measured on Recurring Basis	The following table sets forth by level, within the fair value hierarchy, Registrant’s long-term debt measured at fair value as of December 31, 2024: (dollars in thousands) Level 1 Level 2 Level 3 Total Long-term debt—AWR — $ 608,184 — $ 608,184 (dollars in thousands) Level 1 Level 2 Level 3 Total Long-term debt—GSWC — $ 575,749 — $ 575,749

Revenues (Tables)

Revenues (Tables)	12 Months Ended
	Dec. 31, 2024
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue [Table Text Block]	For the years ended December 31, 2024, 2023, and 2022, disaggregated revenues from contracts with customers by segment are as follows: (dollar in thousands) For The Year Ended December 31, 2024 For The Year Ended December 31, 2023 For The Year Ended December 31, 2022 Water: Tariff-based revenues $ 405,756 $ 394,623 $ 324,838 CPUC-approved surcharges (cost-recovery activities) 2,914 2,955 2,461 Other 2,646 2,753 2,351 Water revenues from contracts with customers 411,316 400,331 329,650 WRAM under/(over)-collection (alternative revenue program) 6,094 33,142 10,952 Total water revenues (1) 417,410 433,473 340,602 Electric: Tariff-based revenues 50,628 40,130 39,750 CPUC-approved surcharges (cost-recovery activities) 173 567 144 Electric revenues from contracts with customers 50,801 40,697 39,894 BRRAM under/(over)-collection (alternative revenue program) 844 1,135 92 Total electric revenues (2) 51,645 41,832 39,986 Contracted services: Water 72,951 75,785 68,626 Wastewater 53,453 44,609 42,314 Contracted services revenues from contracts with customers 126,404 120,394 110,940 Total AWR revenues $ 595,459 $ 595,699 $ 491,528 (1) Water revenues for the year ended December 31, 2023 includes approximately $32 million from the impact of retroactive revenues for the full year of 2022 as a result of the CPUC’s approval of GSWC’s general rate case in June 2023. Furthermore, the CPUC also issued a final decision in June 2023 on GSWC’s cost of capital proceeding. As a result of the final cost of capital decision, for the year ended December 31, 2023, water revenues include $6.4 million from the reversal of revenues subject to refund due to a change in estimates from what had been recorded during 2022. (2) Electric revenues for the year ended December 31, 2024 include $3.7 million from the retroactive impact of revenues for the full year of 2023, resulting from the CPUC's approval of BVES’s general rate case (Note 3).
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]	The opening and closing balances of the receivable from the U.S. government, contract assets and contract liabilities from contracts with customers, which related entirely to ASUS, are as follows: (dollar in thousands) December 31, 2024 December 31, 2023 Unbilled receivables $ 10,910 $ 9,693 Receivable from the U.S. government $ 76,486 $ 91,489 Contract assets $ 21,648 $ 14,378 Contract liabilities $ 5,662 $ 1,352

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2024
Regulated Operations [Abstract]
Schedule of regulatory assets, less regulatory liabilities in the consolidated balance sheets for continuing operations	Regulatory assets, less regulatory liabilities, included in the consolidated balance sheets are as follows: December 31, (dollars in thousands) 2024 2023 GSWC 2022/2023 general rate case memorandum accounts (unbilled revenue) $ 37,711 $ 52,795 Water revenue adjustment mechanism, net of the modified cost balancing account 29,738 41,545 Asset retirement obligations (Note 1) 7,501 7,099 Flowed-through deferred income taxes, net (Note 11) 12,506 3,190 Low income rate assistance balancing accounts 8,834 5,763 Other regulatory assets 11,352 10,661 Excess deferred income taxes (Note 11) (63,682) (70,189) Pensions and other post-retirement obligations (Note 12) (25,179) (4,867) Other regulatory liabilities (608) (268) Total GSWC $ 18,173 $ 45,729 BVES 2023/2024 general rate case memorandum accounts (unbilled revenue) 9,777 — Derivative instrument memorandum account (Note 5) 8,823 2,360 Wildfire mitigation and other fire prevention related costs memorandum accounts 14,681 17,716 Other regulatory assets 8,853 10,280 Other regulatory liabilities (5,628) (6,578) Total BVES $ 36,506 $ 23,778 Total AWR $ 54,679 $ 69,507

Utility Plant and Intangible _2

Utility Plant and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2024
Utility Plant and Intangible Assets
Schedule of Public Utility Property Plant and Equipment Components [Table Text Block]	The following table shows Registrant’s utility plant (regulated utility plant and non-regulated utility property) by major asset class: AWR GSWC (dollars in thousands) 2024 2023 2024 2023 Water Land $ 18,240 $ 18,290 $ 18,240 $ 18,290 Intangible assets 31,004 30,917 31,004 30,917 Source of water supply 115,247 111,112 115,247 111,112 Pumping 253,150 234,264 253,150 234,264 Water treatment 114,784 98,533 114,784 98,533 Transmission and distribution 1,589,763 1,489,974 1,589,763 1,489,974 Other 149,580 140,060 105,123 99,837 2,271,768 2,123,150 2,227,311 2,082,927 Electric Transmission and distribution 141,634 126,143 — — Generation 12,583 12,583 — — Other (1) 16,910 17,745 — — 171,127 156,471 — — Less — accumulated depreciation (648,199) (624,472) (561,256) (543,135) Construction work in progress 304,929 237,131 245,314 195,742 Net utility plant $ 2,099,625 $ 1,892,280 $ 1,911,369 $ 1,735,534 (1) Includes intangible assets of $1.2 million for the years ended December 31, 2024 and 2023 for studies performed.
Schedule of components of intangible assets	As of December 31, 2024 and 2023, intangible assets consist of the following: Weighted Average Amortization AWR December 31, GSWC December 31, (dollars in thousands) Period 2024 2023 2024 2023 Intangible assets : Conservation programs 3 years $ 9,486 $ 9,486 $ 9,486 $ 9,486 Water and service rights (2) 30 years 8,695 8,695 8,124 8,124 Water planning studies 14 years 14,250 14,164 13,012 12,926 Total intangible assets 32,431 32,345 30,622 30,536 Less — accumulated amortization (28,332) (27,275) (27,145) (26,294) Intangible assets, net of amortization $ 4,099 $ 5,070 $ 3,477 $ 4,242 Intangible assets not subject to amortization (3) $ 383 $ 383 $ 382 $ 382 (2) Includes intangible assets of $0.6 million for contracted services included in “Other Property and Investments” on the consolidated balance sheets as of December 31, 2024 and 2023. (3)
Schedule of estimated future consolidated amortization expenses related to intangible assets	Estimated future consolidated amortization expense related to intangible assets are as follows (in thousands): Amortization 2025 $ 984 2026 984 2027 873 2028 863 2029 87 Total $ 3,791
Schedule of reconciliation of the beginning and ending aggregate carrying amount of the asset retirement obligations	The following is a reconciliation of the beginning and ending aggregate carrying amount of asset retirement obligations, which are included in “Other Credits” on the balance sheets as of December 31, 2024 and 2023: (dollars in thousands) GSWC Obligation at December 31, 2022 $ 10,103 Accretion 406 Obligation at December 31, 2023 $ 10,509 Additional liabilities incurred 148 Liabilities settled (328) Accretion 426 Obligation at December 31, 2024 $ 10,755

Derivative Instruments (Tables)

Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2024
BVES
Derivative instruments
Schedule of changes in the fair value of the derivative	The following table presents changes in the fair value of the Level 3 derivatives for the years 2024 and 2023: (dollars in thousands) 2024 2023 Fair value at beginning of the period $ (2,360) $ 11,847 Unrealized (losses) gains on purchase power contracts (6,463) (14,207) Fair value at end of the period $ (8,823) $ (2,360)

Earnings Per Share _ Capital _2

Earnings Per Share / Capital Stock (Tables)	12 Months Ended
	Dec. 31, 2024
Earnings Per Share [Abstract]
Schedule of reconciliation of Registrant's net income and weighted average Common Shares outstanding for calculating basic net income per share	The following is a reconciliation of Registrant’s net income and weighted average Common Shares outstanding used to calculate basic EPS: Basic: For The Years Ended December 31, (in thousands, except per share amounts) 2024 2023 2022 Net income $ 119,268 $ 124,921 $ 78,396 Less: impact from participating securities 419 372 197 Total income available to common shareholders $ 118,849 $ 124,549 $ 78,199 Weighted average Common Shares outstanding, basic 37,464 36,976 36,955 Basic earnings per Common Share $ 3.17 $ 3.37 $ 2.12
Schedule of reconciliation of Registrant's net income and weighted average Common Shares outstanding for calculating diluted net income per share	The following is a reconciliation of Registrant’s net income and weighted average Common Shares outstanding used to calculate diluted EPS: Diluted: For The Years Ended December 31, (in thousands, except per share amounts) 2024 2023 2022 Common shareholders earnings, basic $ 118,849 $ 124,549 $ 78,199 Undistributed earnings for dilutive stock options and restricted stock units 183 189 55 Total common shareholders earnings, diluted $ 119,032 $ 124,738 $ 78,254 Weighted average Common Shares outstanding, basic 37,464 36,976 36,955 Stock-based compensation (1) 119 101 84 Weighted average Common Shares outstanding, diluted 37,583 37,077 37,039 Diluted earnings per Common Share $ 3.17 $ 3.36 $ 2.11 (1) In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 144,799, 115,684 and 96,988 restricted stock units, including performance awards to officers of AWR, at December 31, 2024, 2023 and 2022, respectively, were deemed to be outstanding in accordance with accounting guidance on earnings per share.

Bank Debt (Tables)

Bank Debt (Tables)	12 Months Ended
	Dec. 31, 2024
Bank Debt
Schedule of Short-term Debt	Registrant’s borrowing activities (excluding letters of credit) for the years ended December 31, 2024 and 2023 were as follows: December 31, (in thousands, except percent) 2024 2023 Balance Outstanding at December 31, $ 289,000 $ 333,500 Interest Rate at December 31, 5.33% ~ 5.94% 6.33% ~ 6.96% Average Amount Outstanding $ 315,811 $ 243,355 Weighted Average Annual Interest Rate 6.29 % 6.11 % Maximum Amount Outstanding $ 372,500 $ 333,500 AWR (parent)'s borrowing activities (excluding letters of credit) for the years ended December 31, 2024 and 2023 were as foll ows: December 31, (in thousands, except percent) 2024 2023 Balance Outstanding at December 31, $ 120,000 $ 141,500 Interest Rate at December 31, 5.44 % 6.45 % Average Amount Outstanding $ 122,896 $ 156,533 Weighted Average Annual Interest Rate 6.29 % 5.92 % Maximum Amount Outstanding $ 145,500 $ 257,500

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2024
Debt Disclosure [Abstract]
Schedule of annual maturities of all long-term debt, including capitalized leases	Registrant’s annual maturities of all long-term debt at December 31, 2024 are as follows (in thousands): 2025 $ 385 2026 8,133 2027 65,425 2028 55,446 2029 55,454 Thereafter 459,050 Total $ 643,893

Taxes on Income (Tables)

Taxes on Income (Tables)	12 Months Ended
	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Schedule of significant components of the deferred tax assets and liabilities from continuing operations	The significant components of the deferred tax assets and liabilities as reflected in the balance sheets at December 31, 2024 and 2023 are: AWR GSWC December 31, December 31, (dollars in thousands) 2024 2023 2024 2023 Deferred tax assets: Regulatory-liability-related (1) $ 28,851 $ 32,042 $ 27,171 $ 30,407 Contributions and advances 6,768 6,660 7,103 6,981 Other 5,801 5,924 5,632 6,041 Total deferred tax assets $ 41,420 $ 44,626 $ 39,906 $ 43,429 Deferred tax liabilities: Fixed assets $ (169,666) $ (161,820) $ (162,366) $ (155,131) Regulatory-asset-related: depreciation and other (43,149) (36,337) (39,635) (33,242) Balancing and memorandum accounts (non-flowed-through) (8,778) (8,046) (4,315) (2,514) Total deferred tax liabilities (221,593) (206,203) (206,316) (190,887) Accumulated deferred income taxes, net $ (180,173) $ (161,577) $ (166,410) $ (147,458) (1) Primarily represents the gross-up portion of the deferred income tax (on the excess-deferred-tax regulatory liability) brought about by the Tax Cuts and Jobs Act's reduction of the federal income tax rate.
Schedule of current and deferred components of income tax expense from continuing operations	The current and deferred components of income tax expense are as follows: AWR Year Ended December 31, (dollars in thousands) 2024 2023 2022 Current Federal $ 19,680 $ 26,327 $ 14,845 State 8,451 10,489 6,016 Total current tax expense $ 28,131 $ 36,816 $ 20,861 Deferred Federal $ 1,656 $ 4,157 $ 2,991 State 386 626 (188) Total deferred tax (benefit) expense 2,042 4,783 2,803 Total income tax expense $ 30,173 $ 41,599 $ 23,664 GSWC Year Ended December 31, (dollars in thousands) 2024 2023 2022 Current Federal $ 13,570 $ 22,564 $ 10,582 State 6,551 10,176 4,909 Total current tax expense $ 20,121 $ 32,740 $ 15,491 Deferred Federal $ 1,362 $ 2,867 $ 1,507 State 1,386 82 (652) Total deferred tax (benefit) expense 2,748 2,949 855 Total income tax expense $ 22,869 $ 35,689 $ 16,346
Schedule of reconciliations of the effective tax rates to the federal statutory rate	The reconciliations of the effective tax rates (“ETR”) to the federal statutory rate are as follows: AWR Year Ended December 31, (dollars in thousands) 2024 2023 2022 Federal taxes on pretax income at statutory rate $ 31,383 $ 34,969 $ 21,433 Increase (decrease) in taxes resulting from: State income tax, net of federal benefit 6,508 9,785 4,335 Excess deferred tax amortization (1,467) (1,648) (1,311) Flow-through on fixed assets 1,075 1,067 1,076 Flow-through on removal costs (3,096) (2,255) (1,802) Investment tax credit (69) (71) (71) Excess deferred tax adjustment - change in estimate (5,015) — — Other – net 854 (248) 4 Total income tax expense from operations $ 30,173 $ 41,599 $ 23,664 Pretax income from operations $ 149,441 $ 166,520 $ 102,060 Effective income tax rate 20.2 % 25.0 % 23.2 % GSWC Year Ended December 31, (dollars in thousands) 2024 2023 2022 Federal taxes on pretax income at statutory rate $ 24,640 $ 29,063 $ 14,724 Increase (decrease) in taxes resulting from: State income tax, net of federal benefit 5,772 9,169 3,119 Excess deferred tax amortization (1,491) (1,681) (1,130) Flow-through on fixed assets 1,058 1,041 1,010 Flow-through on removal costs (3,029) (2,225) (1,715) Investment tax credit (69) (71) (71) Excess deferred tax adjustment - change in estimate (5,015) — — Other – net 1,003 393 409 Total income tax expense from operations $ 22,869 $ 35,689 $ 16,346 Pretax income from operations $ 117,332 $ 138,397 $ 70,116 Effective income tax rate 19.5 % 25.8 % 23.3 %

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2024
Retirement Benefits [Abstract]
Schedule of Pension Plan's funded status and amounts recognized in balance sheets and the components of net pension cost and accrued post-retirement liability	The following table sets forth the Pension Plan’s and post-retirement medical plan’s funded status and amounts recognized in Registrant’s balance sheets and the components of net pension cost and accrued liability at December 31, 2024 and 2023: Pension Benefits Post-Retirement Medical (dollars in thousands) 2024 2023 2024 2023 Change in Projected Benefit Obligation: Projected benefit obligation at beginning of year $ 202,963 $ 190,678 $ 1,965 $ 2,014 Service cost 3,323 3,196 128 130 Interest cost 10,241 10,142 98 106 Actuarial (gain) loss (10,932) 8,525 (45) 49 Benefits/expenses paid (10,110) (9,578) (264) (334) Projected benefit obligation at end of year $ 195,485 $ 202,963 $ 1,882 $ 1,965 Changes in Plan Assets: Fair value of plan assets at beginning of year $ 205,305 $ 186,906 $ 12,827 $ 11,240 Actual return on plan assets 19,066 25,031 1,894 1,921 Employer contributions 2,902 2,946 256 265 Benefits/expenses paid (10,111) (9,578) (521) (599) Fair value of plan assets at end of year $ 217,162 $ 205,305 $ 14,456 $ 12,827 Funded Status: Overfunded/(underfunded) amount recognized $ 21,677 $ 2,342 $ 12,574 $ 10,862 Pension Benefits Post-Retirement (dollars in thousands) 2024 2023 2024 2023 Amounts recognized on the balance sheets: Non-current assets $ 21,677 $ 2,342 $ 12,574 $ 10,862 Current liabilities — — — — Non-current liabilities — — — — Net amount recognized $ 21,677 $ 2,342 $ 12,574 $ 10,862 Amounts recognized in regulatory assets (liabilities) consist of: Prior service cost (credit) $ 1,020 $ 1,454 $ — $ — Net loss (gain) (19,867) (1,899) (6,531) (6,272) Regulatory assets (liabilities) (18,847) (445) (6,531) (6,272) Prefunded plan costs (2,830) (1,897) (6,043) (4,590) Net liability (asset) recognized $ (21,677) $ (2,342) $ (12,574) $ (10,862) Changes in plan assets and benefit obligations recognized in regulatory assets (liabilities): Regulatory asset (liability) at beginning of year $ (445) $ 6,012 $ (6,272) $ (5,846) Net loss (gain) (17,968) (6,023) (1,371) (1,395) New prior service cost — — — — Amortization of prior service (cost) credit (434) (434) — — Amortization of net gain (loss) — — 1,112 969 Total change in regulatory asset (liability) (18,402) (6,457) (259) (426) Regulatory asset (liability) at end of year $ (18,847) $ (445) $ (6,531) $ (6,272) Net periodic pension costs $ 1,968 $ 3,289 $ (1,453) $ (1,210) Change in regulatory asset (liability) (18,402) (6,457) (259) (426) Total recognized in net periodic pension cost and regulatory asset (liability) $ (16,434) $ (3,168) $ (1,712) $ (1,636) Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets: Projected benefit obligation $195,485 $202,963 $1,882 $1,965 Accumulated benefit obligation $186,679 $192,986 N/A N/A Fair value of plan assets $217,162 $205,305 $14,456 $12,827 Weighted-average assumptions used to determine benefit obligations at December 31: Discount rate 5.70 % 5.16 % 5.40 % 5.04 % Rate of compensation increase * * N/A N/A • Age-graded ranging from 2.5% to 6.0%. The following provides a reconciliation of benefit obligations, funded status of the SERP, as well as a summary of significant estimates at December 31, 2024 and 2023: (dollars in thousands) 2024 2023 Change in Benefit Obligation: Benefit obligation at beginning of year $ 33,594 $ 30,807 Service cost 1,430 1,248 Interest cost 1,706 1,644 Actuarial loss (gain) (1,028) 840 Benefits paid (944) (945) Benefit obligation at end of year $ 34,758 $ 33,594 Changes in Plan Assets: Fair value of plan assets at beginning and end of year — — Funded Status: Net amount recognized as accrued cost $ (34,758) $ (33,594) (in thousands) 2024 2023 Amounts recognized on the balance sheets: Current liabilities $ (942) $ (942) Non-current liabilities (33,816) (32,652) Net amount recognized $ (34,758) $ (33,594) Amounts recognized in regulatory assets consist of: Prior service cost $ — $ — Net loss 1,855 2,869 Regulatory assets 1,855 2,869 Unfunded accrued cost 32,903 30,725 Net liability recognized $ 34,758 $ 33,594 Changes in plan assets and benefit obligations recognized in regulatory assets consist of: Regulatory asset at beginning of year $ 2,869 $ 1,995 Net (gain) loss (1,028) 840 Amortization of prior service credit — — Amortization of net gain (loss) 14 34 Total change in regulatory asset (1,014) 874 Regulatory asset at end of year $ 1,855 $ 2,869 Net periodic pension cost $ 3,122 $ 2,858 Change in regulatory asset (1,014) 874 Total recognized in net periodic pension and regulatory asset $ 2,108 $ 3,732 Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets: Projected benefit obligation $ 34,758 $ 33,594 Accumulated benefit obligation 33,196 30,794 Fair value of plan assets — — Weighted-average assumptions used to determine benefit obligations: Discount rate 5.66 % 5.15 % Rate of compensation increase * * * Age graded from 4.0% to 4.5% per year.
Schedule of components of net periodic pension and post-retirement benefits cost, before allocation to the overhead pool	The components of net periodic pension and post-retirement benefits cost, before allocation to the overhead pool, for 2024, 2023 and 2022 are as follows: Pension Benefits Post-Retirement (dollars in thousands, except percent) 2024 2023 2022 2024 2023 2022 Components of Net Periodic Benefits Cost: Service cost $3,323 $3,196 $5,644 $128 $130 $129 Interest cost 10,241 10,142 7,401 98 106 60 Expected return on plan assets (12,030) (10,483) (13,166) (567) (477) (587) Amortization of prior service cost (credit) 434 434 434 — — — Amortization of actuarial (gain) loss — — — (1,112) (969) (1,734) Net periodic pension cost under accounting standards $1,968 $3,289 $313 $(1,453) $(1,210) $(2,132) Regulatory adjustment — (281) — — — — Total expense recognized, before surcharges and allocation to overhead pool $1,968 $3,008 $313 $(1,453) $(1,210) $(2,132) Weighted-average assumptions used to determine net periodic cost: Discount rate 5.16 % 5.41 % 2.89 % 5.04 % 5.34 % 2.46 % Expected long-term return on plan assets 6.00 % 5.75 % 5.75 % * * * Rate of compensation increase ** ** ** N/A N/A N/A * 5.75% for union plan and 4.0% for non-union (net of income taxes) in 2024 and 5.50% for union plan and 3.9% for non-union (net of income taxes) in 2023 and 2022. ** Age-graded ranging from 2.5% to 6.0%. The components of SERP expense, before allocation to the overhead pool, for 2024, 2023 and 2022 are as follows: (dollars in thousands, except percent) 2024 2023 2022 Components of Net Periodic Benefits Cost: Service cost $ 1,430 $ 1,248 $ 1,191 Interest cost 1,706 1,644 1,022 Amortization of net (gain) loss (14) (34) 580 Net periodic pension cost $ 3,122 $ 2,858 $ 2,793 Weighted-average assumptions used to determine net periodic cost: Discount rate 5.15 % 5.42 % 2.87 % Rate of compensation increase * * * * A ge graded from 4.0% to 4.5% per year.
Schedule of actual allocation of plan assets	The Committee approves the target asset allocations. Registrant’s pension and post-retirement plan weighted-average asset allocations at December 31, 2024 and 2023, by asset category are as follows: Pension Benefits Post-Retirement Asset Category 2024 2023 2024 2023 Actual Asset Allocations : Equity securities 56 % 56 % 59 % 60 % Debt securities 39 % 39 % 40 % 39 % Real Estate Funds 5 % 5 % — % — % Cash equivalents — % — % 1 % 1 % Total 100 % 100 % 100 % 100 %
Schedule of pension and post-retirement plan target asset allocations	Equity securities did not include AWR’s Common Shares as of December 31, 2024 and 2023. Target Asset Allocations: Pension Benefits Post-retirement Equity securities 60 % 60 % Debt securities 40 % 40 % Total 100 % 100 %
Summary of fair value, measured by net asset value, of the pension investment assets	The following tables set forth the fair value, measured by net asset value, of the pension investment assets as of December 31, 2024 and 2023: Net Asset Value as of December 31, 2024 (dollars in thousands) Fair Value Unfunded Commitments Redemption Frequency Redemption Notice Period Cash equivalents $ 939 — N/A N/A Fixed income fund 84,394 — Daily Daily Equity securities : U.S. small/mid cap funds 21,324 — Daily Daily U.S. large cap funds 53,819 — Daily Daily International funds 46,486 — Daily Daily Total equity funds 121,629 — Real estate funds 10,200 — Daily Daily Total $ 217,162 — Net Asset Value as of December 31, 2023 (dollars in thousands) Fair Value Unfunded Commitments Redemption Frequency Redemption Notice Period Cash equivalents $ 814 — N/A N/A Fixed income fund 80,737 — Daily Daily Equity securities : U.S. small/mid cap funds 19,162 — Daily Daily U.S. large cap funds 49,770 — Daily Daily International funds 45,377 — Daily Daily Total equity funds 114,309 Real estate funds 9,445 — Daily Daily Total $ 205,305 —
Schedule of pension and post-retirement plans' investment assets measured at fair value	The following tables set forth by level, within the fair value hierarchy, the post-retirement plan’s investment assets measured at fair value as of December 31, 2024 and 2023: Fair Value as of December 31, 2024 (dollars in thousands) Level 1 Level 2 Level 3 Total Fair Value of Post-Retirement Plan Assets: Cash equivalents $ 110 — — $ 110 Fixed income 5,818 — — 5,818 U.S. equity securities 8,528 — — 8,528 Total investments measured at fair value $ 14,456 — — $ 14,456 Fair Value as of December 31, 2023 (dollars in thousands) Level 1 Level 2 Level 3 Total Fair Value of Post-Retirement Plan Assets: Cash equivalents $ 189 — — $ 189 Fixed income 5,001 — — 5,001 U.S. equity securities 7,637 — — 7,637 Total investments measured at fair value $ 12,827 — — $ 12,827 The following tables set forth by level, within the fair value hierarchy, the Rabbi Trust investment assets measured at fair value as of December 31, 2024 and 2023: Fair Value as of December 31, 2024 (dollars in thousands) Level 1 Level 2 Level 3 Total Fair Value of Assets held in Rabbi Trust: Cash equivalents $ 11 — — $ 11 Fixed income securities 16,698 — — 16,698 Equity securities 24,478 — — 24,478 Total investments measured at fair value $ 41,187 — — $ 41,187 Fair Value as of December 31, 2023 (dollars in thousands) Level 1 Level 2 Level 3 Total Fair Value of Assets held in Rabbi Trust: Cash equivalents $ 6 — — $ 6 Fixed income securities 13,676 — — 13,676 Equity securities 20,461 — — 20,461 Total investments measured at fair value $ 34,143 — — $ 34,143
Schedule of estimated future benefit payments	Estimated future benefit payments at December 31, 2024 are as follows (in thousands): Pension Benefits Post-Retirement Medical Benefits 2025 $ 11,235 $ 282 2026 11,686 285 2027 12,255 264 2028 12,775 242 2029 13,458 182 Thereafter 72,271 693 Total $ 133,680 $ 1,948 Benefit Payments : Estimated future benefit payments for the SERP at December 31, 2024 are as follows (in thousands): 2025 $ 942 2026 2,656 2027 2,834 2028 2,806 2029 2,901 Thereafter 14,489 Total $ 26,628

Stock-Based Compensation Plans

Stock-Based Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]
Schedule of share-based compensation expenses	The following table presents share-based compensation expenses for the years ended December 31, 2024, 2023 and 2022. These expenses resulting from restricted stock units, including performance awards, are included in administrative and general expenses in AWR’s and GSWC’s statements of income: AWR GSWC For The Years Ended December 31, For The Years Ended December 31, (in thousands) 2024 2023 2022 2024 2023 2022 Stock-based compensation related to: Restricted stock units $ 3,744 $ 3,298 $ 2,571 $ 3,279 $ 2,994 $ 2,269 Total stock-based compensation expense $ 3,744 $ 3,298 $ 2,571 $ 3,279 $ 2,994 $ 2,269
Schedule of assumptions used to estimate fair value of each option grant on the grant date using the Black-Scholes option-pricing model	A summary of the status of Registrant’s outstanding performance awards to officers as of December 31, 2024, and changes during the year ended December 31, 2024, is presented below: Number of Weighted Average Performance awards at January 1, 2024 65,357 $ 87.35 Granted 28,503 73.16 Performance criteria adjustment 15,251 83.31 Vested (22,603) 79.54 Performance awards at December 31, 2024 86,508 $ 84.00
Summary of the status of Registrant's outstanding restricted stock units to employees and directors	A summary of the status of Registrant’s outstanding RSUs, excluding performance awards, to employees and directors as of December 31, 2024, and changes during the year ended December 31, 2024, is presented below: Number of Weighted Average Restricted share units at January 1, 2024 50,327 $ 54.00 Granted 27,051 74.02 Vested (18,301) 86.27 Forfeited (786) 80.70 Restricted share units at December 31, 2024 58,291 $ 52.80

Commitments (Tables)

Commitments (Tables)	12 Months Ended
	Dec. 31, 2024
Risks and Uncertainties [Abstract]
Schedule of estimated future minimum payments under purchased water supply commitments	GSWC’s estimated future minimum payments under these purchased water supply commitments at December 31, 2024 are as follows (in thousands): 2025 $ 459 2026 405 2027 405 2028 220 2029 87 Thereafter 718 Total $ 2,294

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2024
Leases [Abstract]
Supplemental lease information	Registrant’s supplemental lease information is as follows (in thousands, except for weighted average data): For The Year Ended December 31, 2024 For The Year Ended December 31, 2023 Operating lease costs $2,543 $2,486 Short-term lease costs $323 $147 Weighted average remaining lease term (in years) 3.87 4.55 Weighted-average discount rate 4.7% 4.0% Non-cash transactions Lease liabilities arising from obtaining right-of-use assets $2,210 $565
Maturities of operating lease liabilities	Registrant’s future minimum payments under long-term non-cancelable operating leases as of December 31, 2024 are as follows (in thousands): 2025 $ 2,422 2026 2,373 2027 2,087 2028 1,786 2029 617 Thereafter — Total lease payments 9,285 Less: imputed interest 817 Total lease obligations 8,468 Less: current obligations 2,074 Long-term lease obligations $ 6,394

Business Segments (Tables)

Business Segments (Tables)	12 Months Ended
	Dec. 31, 2024
Segment Reporting [Abstract]
Schedule of reporting segments information	Registrant evaluates the performance of its reportable segments based on segment net income (loss). Registrant’s chief operating decision maker is the chief executive officer. The chief operating decision maker uses segment net income (loss) as a financial measure as part of the annual operating budget and forecasting process to monitor monthly financial activities of its segments. This financial information is reviewed and evaluated by the chief operating decision maker in making segment operating, capital, and business decisions. The following tables present information by reportable segment and AWR (parent) that reconcile segment net income (loss) to total consolidated net income (loss) and segment assets to total consolidated assets. The utility plant balances are net of respective accumulated provisions for depreciation. The net property, plant and equipment of the electric segment is presented net of Contributions in Aid of Construction (CIAC). Capital additions reflect capital expenditures paid in cash and exclude U.S. government-funded and third-party prime funded capital expenditures for ASUS’s subsidiaries and property installed by developers and conveyed to GSWC and BVES. For The Year Ended December 31, 2024 Total Contracted Reportable AWR Consolidated (dollars in thousands) Water Electric Services Segments Parent AWR Operating revenues $ 417,410 $ 51,645 $ 126,404 $ 595,459 $ — $ 595,459 Less: Supply costs 111,823 11,357 — 123,180 — 123,180 Other operation 28,349 3,424 9,545 41,318 — 41,318 Administrative and general 64,510 13,241 23,183 100,934 7 100,941 Depreciation and amortization expense (1) 37,187 3,160 3,300 43,647 — 43,647 Maintenance 9,788 5,901 4,566 20,255 — 20,255 Property and other taxes 22,233 2,399 2,459 27,091 — 27,091 ASUS construction expense — — 54,544 54,544 — 54,544 Segment operating income (loss) 143,520 12,163 28,807 184,490 (7) 184,483 Interest expense (38,532) (3,812) (2,166) (44,510) (5,872) (50,382) Interest income 6,018 976 782 7,776 98 7,874 Gain (loss) on investments held in a trust 5,293 — — 5,293 — 5,293 Income tax expense (benefit) 22,869 2,541 6,699 32,109 (1,936) 30,173 Other segment items income (expense) (2) 1,033 968 (82) 1,919 254 2,173 Segment net income (loss) 94,463 7,754 20,642 122,859 (3,591) 119,268 For The Year Ended December 31, 2024 Total Contracted Reportable AWR Consolidated (dollars in thousands) Water Electric Services Segments Parent AWR Capital additions (3) 197,355 29,980 4,625 231,960 — 231,960 For The Year Ended December 31, 2023 Total Contracted Reportable AWR Consolidated (dollars in thousands) Water Electric Services Segments Parent AWR Operating revenues $ 433,473 $ 41,832 $ 120,394 $ 595,699 $ — $ 595,699 Less: Supply costs 120,382 11,554 — 131,936 — 131,936 Other operation 29,064 4,057 7,150 40,271 — 40,271 Administrative and general 59,313 8,745 20,431 88,489 (216) 88,273 Depreciation and amortization expense (1) 35,886 3,256 3,261 42,403 — 42,403 Maintenance 9,906 924 3,388 14,218 — 14,218 Property and other taxes 19,845 2,100 2,101 24,046 — 24,046 ASUS construction expense — — 57,912 57,912 — 57,912 Other (100) — — (100) — (100) Segment operating income (loss) 159,177 11,196 26,151 196,524 216 196,740 Interest expense (31,283) (3,298) (2,127) (36,708) (6,054) (42,762) Interest income 5,557 1,060 806 7,423 (7) 7,416 Gain (loss) on investments held in a trust 5,008 — — 5,008 — 5,008 Income tax expense (benefit) 35,689 1,515 6,109 43,313 (1,714) 41,599 Other segment items income (expense) (2) (62) 36 (125) (151) 269 118 Segment net income (loss) 102,708 7,479 18,596 128,783 (3,862) 124,921 For The Year Ended December 31, 2023 Total Contracted Reportable AWR Consolidated (dollars in thousands) Water Electric Services Segments Parent AWR Capital additions (3) 160,939 25,372 2,229 188,540 — 188,540 The Year Ended December 31, 2022 Total Contracted Reportable AWR Consolidated (dollars in thousands) Water Electric Services Segments Parent AWR Operating revenues $ 340,602 $ 39,986 $ 110,940 $ 491,528 $ — $ 491,528 Less: Supply costs 98,228 11,682 — 109,910 — 109,910 Other operation 28,117 3,311 6,667 38,095 — 38,095 Administrative and general 58,358 7,901 19,923 86,182 8 86,190 Depreciation and amortization expense (1) 34,805 2,792 3,718 41,315 — 41,315 Maintenance 9,559 723 3,110 13,392 — 13,392 Property and other taxes 19,080 1,837 1,977 22,894 — 22,894 ASUS construction expense — — 53,171 53,171 — 53,171 Other — — (75) (75) — (75) Segment operating income (loss) 92,455 11,740 22,449 126,644 (8) 126,636 Interest expense (22,742) (1,225) (743) (24,710) (2,317) (27,027) Interest income 1,083 394 875 2,352 (26) 2,326 Gain (loss) on investments held in a trust (5,177) — — (5,177) — (5,177) Income tax expense (benefit) 16,346 2,439 5,476 24,261 (597) 23,664 Other segment items income (expense) (2) 4,497 406 141 5,044 258 5,302 Segment net income (loss) 53,770 8,876 17,246 79,892 (1,496) 78,396 The Year Ended December 31, 2022 Total Contracted Reportable AWR Consolidated (dollars in thousands) Water Electric Services Segments Parent AWR Capital additions (3) 146,730 18,069 1,441 166,240 — 166,240
Schedule of reconciliation of total utility plant (a key figure for rate-making) to total consolidated assets	The following table reconciles segment net property, plant and equipment to total consolidated assets (in thousands): As Of December 31, 2024 Total Contracted Reportable AWR Less Consolidated Water Electric Services Segments Parent Eliminations AWR Total net property, plant and equipment (4) $ 1,911,369 $ 170,349 $ 17,907 $ 2,099,625 $ — $ — $ 2,099,625 Other assets 220,612 50,048 126,279 396,939 1,045,732 (1,042,087) 400,584 Total consolidated assets $ 2,131,981 $ 220,397 $ 144,186 $ 2,496,564 $ 1,045,732 $ (1,042,087) $ 2,500,209 As Of December 31, 2023 Total Contracted Reportable AWR Less Consolidated Water Electric Services Segments Parent Eliminations AWR Total net property, plant and equipment (4) $ 1,735,534 $ 140,279 $ 16,467 $ 1,892,280 $ — $ — $ 1,892,280 Other assets 180,621 35,241 133,863 349,725 922,901 (918,784) 353,842 Total consolidated assets $ 1,916,155 $ 175,520 $ 150,330 $ 2,242,005 $ 922,901 $ (918,784) $ 2,246,122 (4) The utility plant balances are net of respective accumulated provisions for depreciation.

Allowance for Doubtful Accoun_2

Allowance for Doubtful Accounts (Tables)	12 Months Ended
	Dec. 31, 2024
Allowance for Doubtful Accounts
Schedule of provision for doubtful accounts charged to expense and accounts written off, net of recoveries	The table below presents Registrant’s provision for doubtful accounts charged to expense and accounts written off, net of recoveries. Provisions included in 2024, 2023 and 2022 for AWR and GSWC are as follows: AWR December 31, (dollars in thousands) 2024 2023 2022 Balance at beginning of year $ 3,590 $ 4,440 $ 3,569 Provision charged (1) 1,717 932 2,842 Accounts written off, net of recoveries (2) (1,629) (1,782) (1,971) Balance at end of year $ 3,678 $ 3,590 $ 4,440 Allowance for doubtful accounts related to accounts receivable-customer $ 3,568 $ 3,537 $ 4,387 Allowance for doubtful accounts related to other accounts receivable 110 53 53 Total allowance for doubtful accounts $ 3,678 $ 3,590 $ 4,440 (1) The 2022 balance includes amounts in excess of GSWC’s and BVES’s respective revenue requirements incurred during the COVID-19 pandemic. These incremental amounts were recorded as regulatory assets in the COVID-19 memorandum accounts. (2) Reflects consideration of government relief funds received in 2024 and 2022 from the state of California for unpaid water and electric utility bills incurred during the pandemic. In 2024, a total of $3.5 million was received for unpaid water bills. Additionally, in 2022, $9.5 million and $0.5 million was received for unpaid water and electric utility bills, respectively. GSWC December 31, (dollars in thousands) 2024 2023 2022 Balance at beginning of year $ 3,447 $ 4,196 $ 3,221 Provision charged (3) 1,366 754 2,501 Accounts written off, net of recoveries (4) (1,335) (1,503) (1,526) Balance at end of year $ 3,478 $ 3,447 $ 4,196 Allowance for doubtful accounts related to accounts receivable-customer $ 3,368 $ 3,394 $ 4,143 Allowance for doubtful accounts related to other accounts receivable 110 53 53 Total allowance for doubtful accounts $ 3,478 $ 3,447 $ 4,196 (3) The 2022 balance includes amounts in excess of GSWC’s revenue requirement incurred during the COVID-19 pandemic. This incremental amount was recorded as a regulatory asset in the COVID-19 memorandum account. (4)

Supplemental Cash Flow Inform_2

Supplemental Cash Flow Information (Tables)	12 Months Ended
	Dec. 31, 2024
Supplemental Cash Flow Elements [Abstract]
Schedule of non-cash financing and investing activities and other cash flow information	The following table sets forth non-cash financing and investing activities and other cash flow information (in thousands). AWR GSWC December 31, December 31, 2024 2023 2022 2024 2023 2022 Taxes and Interest Paid: Income taxes paid, net $ 27,850 $ 34,682 $ 27,370 $ 22,840 $ 31,625 $ 20,155 Interest paid, net of capitalized interest 50,347 39,367 26,005 37,994 28,099 22,294 Non-Cash Transactions: Accrued payables for investment in utility plant 49,600 34,906 40,034 44,256 33,465 38,302 Property installed by developers and conveyed 9,840 4,690 1,549 9,840 4,690 1,549

SCHEDULE I - CONDENSED FINANC_2

SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT (Tables)	12 Months Ended
	Dec. 31, 2024
Condensed Financial Information Disclosure [Abstract]
Schedule of Short-term Debt	Registrant’s borrowing activities (excluding letters of credit) for the years ended December 31, 2024 and 2023 were as follows: December 31, (in thousands, except percent) 2024 2023 Balance Outstanding at December 31, $ 289,000 $ 333,500 Interest Rate at December 31, 5.33% ~ 5.94% 6.33% ~ 6.96% Average Amount Outstanding $ 315,811 $ 243,355 Weighted Average Annual Interest Rate 6.29 % 6.11 % Maximum Amount Outstanding $ 372,500 $ 333,500 AWR (parent)'s borrowing activities (excluding letters of credit) for the years ended December 31, 2024 and 2023 were as foll ows: December 31, (in thousands, except percent) 2024 2023 Balance Outstanding at December 31, $ 120,000 $ 141,500 Interest Rate at December 31, 5.44 % 6.45 % Average Amount Outstanding $ 122,896 $ 156,533 Weighted Average Annual Interest Rate 6.29 % 5.92 % Maximum Amount Outstanding $ 145,500 $ 257,500

Summary of Significant Accoun_4

Summary of Significant Accounting Policies (Details)	1 Months Ended	12 Months Ended
	Sep. 30, 2024 USD ($) shares	Dec. 31, 2024 USD ($) state item customer registrant shares	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($) shares	Jun. 05, 2024 USD ($)	Jan. 13, 2023 USD ($)
Nature of Operations:
Number of customers served | customer		1,000,000
Number of States in which Entity Operates | state		10
Number of registrants filing combined report | registrant		2
Related Party Transactions
Related Party Transaction, Amounts of Transaction		$ 5,300,000	$ 5,000,000	$ 5,200,000
Issuance of Common Shares from an at-the-market program, net of issuance costs		$ 88,661,000
Issuance of Common Shares from an at-the-market program, net of issuance costs (in Shares) | shares		25,196	18,371	25,956
Property and Depreciation
Depreciation on transportation equipment		$ 600,000	$ 900,000	$ 400,000
Impairment of Long-Lived Assets
Asset Retirement Obligation, Legally Restricted Assets, Fair Value		0
Impairment of long-lived assets		0	0	$ 0
Goodwill
Goodwill arose from acquisition of subcontractor's business		$ 1,100,000	1,100,000
Advances for Construction and Contributions in aid of Constructions
Period for refund of advances for construction		40 years
Fair Value of Financial Instruments
Long-term debt-GSWC		$ 608,184,000
Level 1
Fair Value of Financial Instruments
Long-term debt-GSWC		0
Level 3
Fair Value of Financial Instruments
Long-term debt-GSWC		0
Carrying Amount
Fair Value of Financial Instruments
Long-term debt-GSWC		643,893,000	579,047,000
Fair Value | Level 2
Fair Value of Financial Instruments
Long-term debt-GSWC		608,184,000	556,214,000
GSWC
Related Party Transactions
Debt Instrument, Face Amount						$ 130,000,000
Issuance of Common Shares from an at-the-market program, net of issuance costs		$ 40,000,000	$ 10,000,000
Issuance of Common Shares from an at-the-market program, net of issuance costs (in Shares) | shares		2.7586	1	0
Property and Depreciation
Depreciation on transportation equipment			$ 200,000
Estimated useful lives of utility plant, as authorized by the CPUC
Generation		40 years
Fair Value of Financial Instruments
Long-term debt-GSWC		$ 575,749,000
GSWC | Unsecured Private Placement Notes
Related Party Transactions
Debt Instrument, Face Amount					$ 65,000,000	$ 130,000,000
GSWC | Level 1
Fair Value of Financial Instruments
Long-term debt-GSWC		0
GSWC | Level 3
Fair Value of Financial Instruments
Long-term debt-GSWC		0
GSWC | Carrying Amount
Fair Value of Financial Instruments
Long-term debt-GSWC		608,893,000	544,047,000
GSWC | Fair Value | Level 2
Fair Value of Financial Instruments
Long-term debt-GSWC		$ 575,749,000	522,883,000
GSWC | Minimum
Estimated useful lives of utility plant, as authorized by the CPUC
Source of water supply		20 years
Pumping		26 years
Water treatment		26 years
Transmission and Distribution		15 years
Other plant		5 years
GSWC | Maximum
Estimated useful lives of utility plant, as authorized by the CPUC
Source of water supply		60 years
Pumping		41 years
Water treatment		32 years
Transmission and Distribution		80 years
Other plant		62 years
BVES
Related Party Transactions
Related Party Transaction, Amounts of Transaction		$ 3,200,000	3,500,000	$ 2,700,000
Issuance of Common Shares from an at-the-market program, net of issuance costs	$ 22,000,000
Issuance of Common Shares from an at-the-market program, net of issuance costs (in Shares) | shares	11
Interest
Public Utilities, Allowance for Funds Used During Construction, Additions		1,300,000		$ 100,000
BVES | Carrying Amount
Fair Value of Financial Instruments
Long-term debt-GSWC		$ 35,000,000	$ 35,000,000
Bay State Utility Service LLC ("BSUS")
Nature of Operations:
Number of contracts | item		1
Golden State Water Company and Bear Valley Electric Service, Inc.
Property and Depreciation
Aggregate composite rate for depreciation (as a percent)		2%	2%	2%
Depreciation		$ 39,800,000	$ 38,300,000	$ 37,300,000
Depreciation on transportation equipment		$ 600,000	$ 900,000
Water: | GSWC
Nature of Operations:
Number of customers served | customer		264,600
Electric: | BVES
Nature of Operations:
Number of customers served | customer		24,900
Contracted services: | American States Utility Services | Minimum
Nature of Operations:
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases		15 years
Contracted services: | American States Utility Services | Maximum
Nature of Operations:
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases		50 years
Period of Fixed Price Contracts to Maintain Water Systems at Various Military Bases		50 years
Contracted services: | Patuxent River Utility Services LLC("PRUS")
Nature of Operations:
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases		50 years
Initial price contract value and subject to annual economic price adjustments		$ 349,000,000
Revised price contract value after an inventory adjustment		378,000,000
Contracted services: | Bay State Utility Service LLC ("BSUS")
Nature of Operations:
Initial price contract value and subject to annual economic price adjustments		$ 75,000,000
Period of Fixed Price Contracts to Maintain Water Systems at Various Military Bases		15 years
ContractInitialOrderValueToPerformAnEvaluationConstructionAndTransitionServices		$ 4,100,000

Revenues (Details)

Revenues (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) unit	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Disaggregation of Revenue [Line Items]
Revenue, Performance Obligation, Payment Terms	20 days
Cost of services	$ 54,544	$ 57,912	$ 53,171
GSWC
Disaggregation of Revenue [Line Items]
Retroactive water revenues impact as a result of a proposed decision		32,000
Golden State Water Company and Bear Valley Electric Service, Inc.
Disaggregation of Revenue [Line Items]
Period within which Expected Additional Revenue Collection is Recorded Subject to Undercollection of Revenue	24 months
BVES
Disaggregation of Revenue [Line Items]
Retroactive water revenues impact as a result of a proposed decision	$ 3,700
Contracted services: | American States Utility Services
Disaggregation of Revenue [Line Items]
Number of the contracts with 15-year contracts with the U.S. government | unit	1
Number of construction performance obligation | unit	1
Contracted services: | American States Utility Services | Maximum
Disaggregation of Revenue [Line Items]
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases	50 years
Contracted services: | American States Utility Services | Minimum
Disaggregation of Revenue [Line Items]
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases	15 years
Sales | Water: | GSWC | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of total revenues	90%
Sales | Electric: | BVES | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of total revenues	90%
Franchisor | Golden State Water Company and Bear Valley Electric Service, Inc.
Disaggregation of Revenue [Line Items]
Cost of services	$ 4,600	$ 4,900	$ 4,000

Revenues Disaggregation of Reve

Revenues Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Operating revenues	$ 595,459	$ 595,699	$ 491,528
GSWC
Disaggregation of Revenue [Line Items]
Operating revenues	417,410	433,473	340,602
GSWC | Water:
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	411,316	400,331	329,650
Operating revenues	417,410	433,473	340,602
GSWC | Water: | Tariff-based revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	405,756	394,623	324,838
GSWC | Water: | CPUC-approved surcharges (cost-recovery activities)
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	2,914	2,955	2,461
GSWC | Water: | Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	2,646	2,753	2,351
GSWC | Water: | Alternative revenue program
Disaggregation of Revenue [Line Items]
Under/(over)-collection (alternative revenue program)	6,094	33,142	10,952
American States Utility Services | Contracted services:
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	126,404	120,394	110,940
American States Utility Services | Contracted services: | Water
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	72,951	75,785	68,626
American States Utility Services | Contracted services: | Wastewater
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	53,453	44,609	42,314
BVES | Electric:
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	50,801	40,697	39,894
Operating revenues	51,645	41,832	39,986
BVES | Electric: | Tariff-based revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	50,628	40,130	39,750
BVES | Electric: | CPUC-approved surcharges (cost-recovery activities)
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	173	567	144
BVES | Electric: | Alternative revenue program
Disaggregation of Revenue [Line Items]
Under/(over)-collection (alternative revenue program)	$ 844	$ 1,135	$ 92

Revenues Contract assets and Co

Revenues Contract assets and Contract Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Contract with Customer, Asset and Liability [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 4,100,000
American States Utility Services
Contract with Customer, Asset and Liability [Line Items]
Unbilled Contracts Receivable	10,910	$ 9,693
Government Contract Receivable	76,486	91,489
Contract assets	21,648	14,378
Contract liabilities	$ 5,662	$ 1,352
Minimum | American States Utility Services
Contract with Customer, Asset and Liability [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	14 years
Maximum | American States Utility Services
Contract with Customer, Asset and Liability [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	49 years

Regulatory Matters - Narrative

Regulatory Matters - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 54,679,000	$ 69,507,000
Golden State Water Company and Bear Valley Electric Service, Inc.
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	54,700,000
Regulatory assets	149,800,000
Regulatory liability	$ 95,100,000
Commercial paper, term	90 days
Regulatory asset not accruing carrying costs	$ 26,300,000
Regulatory liabilities not accruing carrying costs	92,100,000
GSWC
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 18,173,000	$ 45,729,000
Discount percentage for qualified low income water customers	20%
GSWC | Cost of capital proceeding
Schedule of Regulatory Assets and Liabilities [Line Items]
Approved equity capital structure, percentage		57%
Approved debt capital structure, percentage		43%
Cost of debt, percentage		5.10%
Approved return on equity, percentage		8.85%
Term for the cost of capital proceeding		3 years
Revenue impact due to lower cost of debt		$ 6,400,000
BVES
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 36,506,000	23,778,000
Discount percentage for qualified low income water customers	20%
Incremental vegetation management costs	$ 9,900,000
Regulatory asset wildfire mitigation plans WMP	4,800,000
Flowed-through deferred income taxes, net (Note 11) | Golden State Water Company and Bear Valley Electric Service, Inc.
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset not accruing carrying costs	14,300,000
Flowed-through deferred income taxes, net (Note 11) | GSWC
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory assets	12,506,000	3,190,000
Derivative instrument memorandum account (Note 5)
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset not accruing carrying costs	8,800,000
Derivative instrument memorandum account (Note 5) | BVES
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory assets	8,823,000	2,360,000
Other Regulatory Assets | Golden State Water Company and Bear Valley Electric Service, Inc.
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory asset not accruing carrying costs	3,200,000
Other Regulatory Assets | GSWC
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory assets	11,352,000	10,661,000
Other Regulatory Assets | BVES
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory assets	8,853,000	10,280,000
Excess deferred income taxes (Note 11)
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	67,500,000
Pensions and other post-retirement obligations (Note 12) | Golden State Water Company and Bear Valley Electric Service, Inc.
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory liabilities not accruing carrying costs	23,500,000
Pensions and other post-retirement obligations (Note 12) | GSWC
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory assets	23,500,000
Pensions and other post-retirement obligations (Note 12) | GSWC | Under Collection in Two Way Pension Balancing Account
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	1,700,000
Other Regulatory Liabilities | Golden State Water Company and Bear Valley Electric Service, Inc.
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory liabilities not accruing carrying costs	1,100,000
2022/2023 general rate case memorandum accounts (unbilled revenue) | GSWC
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	37,700,000
Regulatory assets	$ 37,711,000	52,795,000
Water revenue adjustment mechanism, net of the modified cost balancing account
Schedule of Regulatory Assets and Liabilities [Line Items]
Recovery period	18 months
Water revenue adjustment mechanism, net of the modified cost balancing account | GSWC
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 29,700,000
Regulatory assets	$ 29,738,000	41,545,000
Commercial paper, term	90 days
Recovery period	24 months
Water Revenue Adjustment Mechanism
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory adjustment increase (decrease)	$ 8,000,000
Deferred revenues	0
Water Revenue Adjustment Mechanism | GSWC
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	29,100,000
Modified Cost Balancing Account | GSWC
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	600,000
Low income rate assistance balancing accounts | Golden State Water Company and Bear Valley Electric Service, Inc.
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	8,800,000
Low income rate assistance balancing accounts | GSWC
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory assets	8,834,000	5,763,000
Wildfire mitigation and other fire prevention related costs memorandum accounts | BVES
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory assets	$ 14,681,000	17,716,000
Regulatory asset, amortization period	36 months
Filing term for the Wildfire Mitigation and Other Fire Prevention related costs balancing and memorandum accounts	90 days
2023/2024 general rate case memorandum accounts (unbilled revenue) | BVES
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 9,800,000
Regulatory assets	$ 9,777,000	$ 0
Regulatory asset, amortization period	36 months
Filing term for the Wildfire Mitigation and Other Fire Prevention related costs balancing and memorandum accounts	90 days

Regulatory Matters - Schedule o

Regulatory Matters - Schedule of Regulatory Liabilities and Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	$ 54,679	$ 69,507
GSWC
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	18,173	45,729
GSWC | Excess deferred income taxes (Note 11)
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory liability	(63,682)	(70,189)
GSWC | Pensions and other post-retirement obligations (Note 12)
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory liability	(25,179)	(4,867)
GSWC | Other regulatory liabilities
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory liability	(608)	(268)
GSWC | 2022/2023 general rate case memorandum accounts (unbilled revenue)
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory assets	37,711	52,795
Net regulatory assets	37,700
GSWC | Water revenue adjustment mechanism, net of the modified cost balancing account
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory assets	29,738	41,545
Net regulatory assets	29,700
GSWC | Asset retirement obligations (Note 1)
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory assets	7,501	7,099
GSWC | Flowed-through deferred income taxes, net (Note 11)
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory assets	12,506	3,190
GSWC | Low income rate assistance balancing accounts
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory assets	8,834	5,763
GSWC | Other Regulatory Assets
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory assets	11,352	10,661
BVES
Schedule of Regulatory Assets and Liabilities [Line Items]
Net regulatory assets	36,506	23,778
BVES | Other regulatory liabilities
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory liability	(5,628)	(6,578)
BVES | Other Regulatory Assets
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory assets	8,853	10,280
BVES | 2023/2024 general rate case memorandum accounts (unbilled revenue)
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory assets	9,777	0
Net regulatory assets	9,800
BVES | Derivative instrument memorandum account (Note 5)
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory assets	8,823	2,360
BVES | Wildfire mitigation and other fire prevention related costs memorandum accounts
Schedule of Regulatory Assets and Liabilities [Line Items]
Regulatory assets	$ 14,681	$ 17,716

Utility Plant and Intangible _3

Utility Plant and Intangible Assets - By Major Asset Class (Details) - USD ($) $ in Thousands		Dec. 31, 2024	Dec. 31, 2023
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost		$ 2,442,895	$ 2,279,621
Less — accumulated depreciation		(648,199)	(624,472)
Construction work in progress		304,929	237,131
Net utility plant		2,099,625	1,892,280
Water
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost		2,271,768	2,123,150
Water | Land
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost		18,240	18,290
Water | Intangible assets
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost		31,004	30,917
Water | Source of water supply
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost		115,247	111,112
Water | Pumping
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost		253,150	234,264
Water | Water treatment
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost		114,784	98,533
Water | Transmission and distribution
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost		1,589,763	1,489,974
Water | Other
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost		149,580	140,060
Electric: | Intangible assets
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost		1,200	1,200
GSWC
Utility plant utilized in continuing operations by major asset class
Less — accumulated depreciation		(561,256)	(543,135)
Construction work in progress		245,314	195,742
Net utility plant		1,911,369	1,735,534
GSWC | Water
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost		2,227,311	2,082,927
GSWC | Water | Land
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost		18,240	18,290
GSWC | Water | Intangible assets
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost		31,004	30,917
GSWC | Water | Source of water supply
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost		115,247	111,112
GSWC | Water | Pumping
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost		253,150	234,264
GSWC | Water | Water treatment
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost		114,784	98,533
GSWC | Water | Transmission and distribution
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost		1,589,763	1,489,974
GSWC | Water | Other
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost		105,123	99,837
GSWC | Electric:
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost		0	0
GSWC | Electric: | Transmission and distribution
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost		0	0
GSWC | Electric: | Generation
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost		0	0
GSWC | Electric: | Other
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost	[1]	0	0
BVES | Electric:
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost		171,127	156,471
BVES | Electric: | Transmission and distribution
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost		141,634	126,143
BVES | Electric: | Generation
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost		12,583	12,583
BVES | Electric: | Other
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost	[1]	$ 16,910	$ 17,745
[1] Includes intangible assets of $1.2 million for the years ended December 31, 2024 and 2023 for studies performed.

Utility Plant and Intangible _4

Utility Plant and Intangible Assets - Schedule of Components (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023
Intangible assets
Total intangible assets		$ 32,431	$ 32,345
Less — accumulated amortization		(28,332)	(27,275)
Intangible assets, net of amortization		4,099	5,070
Intangible assets not subject to amortization	[1]	383	383
Total utility plant, at cost		$ 2,442,895	$ 2,279,621
Conservation programs
Intangible assets
Weighted Average Amortization Period (in years)		3 years	3 years
Total intangible assets		$ 9,486	$ 9,486
Water and water service rights
Intangible assets
Weighted Average Amortization Period (in years)		30 years	30 years
Total intangible assets	[2]	$ 8,695	$ 8,695
Water planning studies
Intangible assets
Weighted Average Amortization Period (in years)		14 years	14 years
Total intangible assets		$ 14,250	$ 14,164
GSWC
Intangible assets
Total intangible assets		30,622	30,536
Less — accumulated amortization		(27,145)	(26,294)
Intangible assets, net of amortization		3,477	4,242
Intangible assets not subject to amortization	[1]	$ 382	$ 382
GSWC | Conservation programs
Intangible assets
Weighted Average Amortization Period (in years)		3 years	3 years
Total intangible assets		$ 9,486	$ 9,486
GSWC | Water and water service rights
Intangible assets
Weighted Average Amortization Period (in years)		30 years	30 years
Total intangible assets	[2]	$ 8,124	$ 8,124
GSWC | Water planning studies
Intangible assets
Weighted Average Amortization Period (in years)		14 years	14 years
Total intangible assets		$ 13,012	$ 12,926
Intangible assets | American States Utility Services
Intangible assets
Total utility plant, at cost		$ 600	$ 600
[1]The intangible assets not subject to amortization primarily consist of organization and consent fees.[2]Includes intangible assets of $0.6 million for contracted services included in “Other Property and Investments” on the consolidated balance sheets as of December 31, 2024 and 2023.

Utility Plant and Intangible _5

Utility Plant and Intangible Assets - Schedule of Maturity (Details) $ in Thousands	Dec. 31, 2024 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2025	$ 984
2026	984
2027	873
2028	863
2029	87
Total	$ 3,791

Utility Plant and Intangible _6

Utility Plant and Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 1,000	$ 1,100	$ 600

Utility Plant and Intangible _7

Utility Plant and Intangible Assets - ARO Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Reconciliation of the beginning and ending aggregate carrying amount of the asset retirement obligations
Obligation at the beginning of the period	$ 10,509	$ 10,103
Accretion	426	406
Asset Retirement Obligation, Liabilities Incurred	148
Asset Retirement Obligation, Liabilities Settled	(328)
Obligation at the end of the period	$ 10,755	$ 10,509

Derivative Instruments (Details

Derivative Instruments (Details) - BVES $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) MWh	Dec. 31, 2023 USD ($)
Derivative instruments
Derivative Activity Volume | MWh	578,448
Changes in the fair value of the derivative
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs	$ (8,800)
Purchase power contract
Changes in the fair value of the derivative
Balance, at beginning of the period	(2,360)	$ 11,847
Unrealized (losses) gains on purchase power contracts	(6,463)	(14,207)
Balance, at end of the period	$ (8,823)	$ (2,360)
Minimum
Derivative instruments
Derivative, Term of Contract	3 years
Minimum | Purchase power contract
Derivative instruments
Derivative, Term of Contract	3 years
Maximum
Derivative instruments
Derivative, Term of Contract	5 years
Maximum | Purchase power contract
Derivative instruments
Derivative, Term of Contract	5 years

Military Privatization (Details

Military Privatization (Details) - Contracted services: $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)
Bay State Utility Service LLC ("BSUS")
Military Privatization
Period of fixed price contracts to maintain water systems at various military bases	15 years
Initial price contract value and subject to annual economic price adjustments	$ 75
ContractInitialOrderValueToPerformAnEvaluationConstructionAndTransitionServices	4.1
Patuxent River Utility Services LLC("PRUS")
Military Privatization
Initial price contract value and subject to annual economic price adjustments	$ 349
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases	50 years
Revised price contract value after an inventory adjustment	$ 378
Maximum | American States Utility Services
Military Privatization
Period of fixed price contracts to maintain water systems at various military bases	50 years
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases	50 years

Earnings Per Share _ Capital _3

Earnings Per Share / Capital Stock -Schedule of EPS (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Basic
Net Income		$ 119,268	$ 124,921	$ 78,396
Less: impact from participating securities		419	372	197
Total income available to common shareholders		$ 118,849	$ 124,549	$ 78,199
Weighted average Common Shares outstanding, basic		37,464,000	36,976,000	36,955,000
Basic earnings per Common Share (usd per share)		$ 3.17	$ 3.37	$ 2.12
Diluted
Total income available to common shareholders		$ 118,849	$ 124,549	$ 78,199
Undistributed earnings for dilutive stock-based awards		183	189	55
Total common shareholders earnings, diluted		$ 119,032	$ 124,738	$ 78,254
Weighted average Common Shares outstanding, basic		37,464,000	36,976,000	36,955,000
Stock-based compensation (in shares)	[1]	119,000	101,000	84,000
Weighted Average Number of Diluted Shares (in shares)		37,583,000	37,077,000	37,039,000
Earnings Per Share, Diluted		$ 3.17	$ 3.36	$ 2.11
Capital stock
Weighted Average Number of Shares Outstanding (in shares)		37,464,000	36,976,000	36,955,000
Sale of Stock, Consideration Received on Transaction		$ 89,500
AWR
Basic
Net Income		$ 119,268	$ 124,921	$ 78,396
Weighted average Common Shares outstanding, basic		37,464,000	36,976,000	36,955,000
Basic earnings per Common Share (usd per share)		$ 3.17	$ 3.37	$ 2.12
Diluted
Weighted average Common Shares outstanding, basic		37,464,000	36,976,000	36,955,000
Weighted Average Number of Diluted Shares (in shares)		37,583,000	37,077,000	37,039,000
Earnings Per Share, Diluted		$ 3.17	$ 3.36	$ 2.11
Capital stock
Weighted Average Number of Shares Outstanding (in shares)		37,464,000	36,976,000	36,955,000
Restricted Stock Units
Diluted
Restricted stock units outstanding (in shares)		144,799	115,684	96,988
Capital stock
Restricted stock units outstanding (in shares)		144,799	115,684	96,988
[1] (1) In applying the treasury stock method of reflecting the dilutive effect of outstanding stock-based compensation in the calculation of diluted EPS, 144,799, 115,684 and 96,988 restricted stock units, including performance awards to officers of AWR, at December 31, 2024, 2023 and 2022, respectively, were deemed to be outstanding in accordance with accounting guidance on earnings per share.

Earnings Per Share _ Capital _4

Earnings Per Share / Capital Stock- Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Feb. 27, 2024
Additional disclosure
Exercise of stock options and other issuance of Common Shares	25,196	18,371	25,956
Proceeds from Stock Options Exercised, Distributed to Subsidiaries	$ 0	$ 0	$ 0
Dividend Reinvestment Plan Common Stock Capital Shares Reserved for Future Issuance	1,055,948
Common Shares authorized for issuance but unissued under 401(k) Plan	387,300
Issuance of Common Shares from an at-the-market program, net of issuance costs	$ 88,661,000
Sale of Stock, Maximum Consideration On Transaction				$ 200,000,000
Payments of Stock Issuance Costs	800,000
Payments for Commissions	$ 1,400,000
Weighted Average Number of Shares Outstanding (in shares)	37,464,000	36,976,000	36,955,000
Sale of Stock, Agreement Term	3 years
Sale of Stock, Number of Shares Issued in Transaction	1,145,219
Sale of Stock, Consideration Received on Transaction	$ 89,500,000
Sale of Stock, remaining available for sale	$ 109,100,000
AWR
Additional disclosure
Weighted Average Number of Shares Outstanding (in shares)	37,464,000	36,976,000	36,955,000
GSWC
Additional disclosure
Exercise of stock options and other issuance of Common Shares	2.7586	1	0
Issuance of Common Shares from an at-the-market program, net of issuance costs	$ 40,000,000	$ 10,000,000

Dividend Limitations (Details)

Dividend Limitations (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Dividend limitations
Common shareholder’s equity	$ 920,051	$ 776,109	$ 709,549	$ 685,947
GSWC
Dividend limitations
Ratio of indebtedness to net capital	0.4754
Dividends paid	$ 35,100	55,400	27,000
Common shareholder’s equity	$ 805,833	$ 703,828	$ 643,906	$ 615,686
GSWC | Maximum
Dividend limitations
Ratio of indebtedness to net capital	0.6667

Bank Debt (Details)

Bank Debt (Details) $ in Thousands		12 Months Ended
	Jun. 28, 2023	Dec. 31, 2025	Dec. 31, 2024 USD ($) unit	Dec. 31, 2023 USD ($)	Feb. 12, 2025 USD ($)	Aug. 01, 2024 USD ($)	Feb. 15, 2024 USD ($)	Nov. 06, 2023 USD ($)	Nov. 05, 2023 USD ($)	Jun. 27, 2023 USD ($)	Jan. 13, 2023 USD ($)
Bank debt
Number of credit facilities | unit			3
Debt instrument, term	5 years
Line of credit facility, current borrowing capacity								$ 165,000
Incremental expansion of borrowing capacity									$ 75,000
Note payable to bank, noncurrent			$ 165,000	$ 291,500
BVES
Bank debt
Debt instrument, term			24 months
BVES | Subsequent Event | Debt due Feb 2030
Bank debt
Debt Instrument, Face Amount					$ 50,000
BVES | Financing Applications
Bank debt
Regulatory Rate Case Filings Requested Authorization For Debt And Equity Issuance Amount						$ 120,000
GSWC
Bank debt
Debt instrument, term			24 months
Ratio of indebtedness to net capital			0.4754
Note payable to bank, noncurrent			$ 0	150,000
Debt Instrument, Face Amount											$ 130,000
Maximum | GSWC
Bank debt
Ratio of indebtedness to net capital			0.6667
Revolving Credit Facility
Bank debt
Line of credit facility, current borrowing capacity									$ 150,000
Notes Payable			$ 289,000	333,500
Average Amount Outstanding			$ 315,811	$ 243,355
Weighted Average Annual Interest Rate (as a percent)			6.29%	6.11%
Maximum Amount Outstanding			$ 372,500	$ 333,500
Revolving Credit Facility | BVES
Bank debt
Debt instrument, term			5 years
Maximum borrowing capacity							$ 65,000
Interest coverage ratio			4.60
Total funded debt ratio			0.44
Line of credit facility, accordion feature, increase limit							$ 10,000
Note payable to bank, noncurrent			$ 45,000
Revolving Credit Facility | GSWC
Bank debt
Debt instrument, term			5 years
Incremental expansion of borrowing capacity			$ 75,000
Debt issuance costs, line of credit arrangements, gross			$ 800
Total funded debt ratio			0.48
Note payable to bank, noncurrent			$ 124,000
Revolving Credit Facility | Maximum
Bank debt
Ratio of indebtedness to net capital			0.65
Interest Rate at the end of the period (as a percent)			5.94%	6.96%
Revolving Credit Facility | Maximum | GSWC
Bank debt
Line of credit facility, current borrowing capacity			$ 200,000
Revolving Credit Facility | Minimum
Bank debt
Interest Rate at the end of the period (as a percent)			5.33%	6.33%
Revolving Credit Facility | Minimum | BVES
Bank debt
Interest coverage ratio			3
Revolving Credit Facility | Minimum | BVES | Subsequent Event
Bank debt
Interest coverage ratio		4.5
Letters of credit
Bank debt
Maximum borrowing capacity								$ 10,000
Letters of credit | GSWC
Bank debt
Maximum borrowing capacity			$ 20,000
AWR
Bank debt
Note payable to bank, noncurrent			$ 120,000	$ 141,500
AWR | Maximum
Bank debt
Line of credit facility, current borrowing capacity										$ 280,000
AWR | Revolving Credit Facility
Bank debt
Debt instrument, term			5 years
Debt issuance costs, line of credit arrangements, gross			$ 600
Total funded debt ratio			0.51
Note payable to bank, noncurrent			$ 120,000
Notes Payable			120,000	141,500
Average Amount Outstanding			$ 122,896	$ 156,533
Interest Rate at the end of the period (as a percent)			5.44%	6.45%
Weighted Average Annual Interest Rate (as a percent)			6.29%	5.92%
Maximum Amount Outstanding			$ 145,500	$ 257,500

Bank Debt - Schedule of Borrowi

Bank Debt - Schedule of Borrowing Activities (Details) - Revolving Credit Facility - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Bank debt
Notes Payable	$ 289,000	$ 333,500
Average Amount Outstanding	$ 315,811	$ 243,355
Weighted Average Annual Interest Rate (as a percent)	6.29%	6.11%
Maximum Amount Outstanding	$ 372,500	$ 333,500
Maximum
Bank debt
Interest Rate at the end of the period (as a percent)	5.94%	6.96%
Minimum
Bank debt
Interest Rate at the end of the period (as a percent)	5.33%	6.33%

Long-Term Debt (Details)

Long-Term Debt (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024	Feb. 12, 2025 USD ($)	Jun. 05, 2024 USD ($)	Jan. 13, 2023 USD ($)
Debt Instrument [Line Items]
Ratio of Indebtedness to EBITDA	8
GSWC
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 130
Ratio of indebtedness to net capital	0.4754
Ratio of Indebtedness to EBITDA	3.8
GSWC | Maximum
Debt Instrument [Line Items]
Ratio of indebtedness to net capital	0.6667
Series A Senior Notes 5.12 Percent Due 2033 | GSWC
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 100
Interest rate per annum (as a percent)				5.12%
Interest rate (as a percent)				5.12%
Private Placement Notes | GSWC
Debt Instrument [Line Items]
Debt Instrument Redemption Premium above Treasury Yield	50%
Series A Senior Notes 5.22 Percent Due 2038 | GSWC
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 30
Interest rate per annum (as a percent)				5.22%
Interest rate (as a percent)				5.22%
Unsecured Private Placement Notes | GSWC
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 65	$ 130
Interest rate per annum (as a percent)			5.50%
Interest rate (as a percent)			5.50%
Debt due Feb 2030 | BVES | Subsequent Event
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 50
Interest rate per annum (as a percent)		6.12%
Interest rate (as a percent)		6.12%

Long-Term Debt 2 (Details)

Long-Term Debt 2 (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Annual maturities of all long-term debt, including capitalized leases
2025	$ 385
2026	8,133
2027	65,425
2028	55,446
2029	55,454
Thereafter	459,050
Total	643,893	$ 579,047
GSWC
Annual maturities of all long-term debt, including capitalized leases
Total	$ 608,893	$ 544,047

Taxes on Income (Details)

Taxes on Income (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Taxes on income
Unrecognized Tax Benefits	$ 0	$ 0	$ 0
Deferred tax assets:
Regulatory-liability-related	28,851,000	32,042,000
Contributions and advances	6,768,000	6,660,000
Deferred Tax Assets, Other	5,801,000	5,924,000
Deferred tax assets	41,420,000	44,626,000
Deferred tax liabilities:
Fixed assets	(169,666,000)	(161,820,000)
Regulatory-asset-related: depreciation and other	(43,149,000)	(36,337,000)
Balancing and memorandum accounts (non-flow-through)	(8,778,000)	(8,046,000)
Deferred tax liabilities	(221,593,000)	(206,203,000)
Accumulated deferred income taxes - net	(180,173,000)	(161,577,000)
Current
Federal	19,680,000	26,327,000	14,845,000
State	8,451,000	10,489,000	6,016,000
Total current tax expense	28,131,000	36,816,000	20,861,000
Deferred
Federal	1,656,000	4,157,000	2,991,000
State	386,000	626,000	(188,000)
Total deferred tax (benefit) expense	2,042,000	4,783,000	2,803,000
Reconciliations of the effective tax rates to the federal statutory rate
Federal taxes on pretax income at statutory rate	31,383,000	34,969,000	21,433,000
Increase (decrease) in taxes resulting from:	6,508,000	9,785,000	4,335,000
Excess deferred tax amortization	(1,467,000)	(1,648,000)	(1,311,000)
Flow-through on fixed assets	1,075,000	1,067,000	1,076,000
Flow-through on removal costs	(3,096,000)	(2,255,000)	(1,802,000)
Tax Adjustments, Release of Regulatory Liability	(5,015,000)	0	0
Investment tax credit	(69,000)	(71,000)	(71,000)
Other- net	854,000	(248,000)	4,000
Total income tax expense operations	30,173,000	41,599,000	23,664,000
Income before income taxes	$ 149,441,000	$ 166,520,000	$ 102,060,000
Effective income tax rate (as a percent)	20.20%	25%	23.20%
Income tax effect, excess deferred income taxes estimate change	$ 5,000,000
GSWC
Deferred tax assets:
Regulatory-liability-related	27,171,000	$ 30,407,000
Contributions and advances	7,103,000	6,981,000
Deferred Tax Assets, Other	5,632,000	6,041,000
Deferred tax assets	39,906,000	43,429,000
Deferred tax liabilities:
Fixed assets	(162,366,000)	(155,131,000)
Regulatory-asset-related: depreciation and other	(39,635,000)	(33,242,000)
Balancing and memorandum accounts (non-flow-through)	(4,315,000)	(2,514,000)
Deferred tax liabilities	(206,316,000)	(190,887,000)
Accumulated deferred income taxes - net	(166,410,000)	(147,458,000)
Current
Federal	13,570,000	22,564,000	$ 10,582,000
State	6,551,000	10,176,000	4,909,000
Total current tax expense	20,121,000	32,740,000	15,491,000
Deferred
Federal	1,362,000	2,867,000	1,507,000
State	1,386,000	82,000	(652,000)
Total deferred tax (benefit) expense	2,748,000	2,949,000	855,000
Reconciliations of the effective tax rates to the federal statutory rate
Federal taxes on pretax income at statutory rate	24,640,000	29,063,000	14,724,000
Increase (decrease) in taxes resulting from:	5,772,000	9,169,000	3,119,000
Excess deferred tax amortization	(1,491,000)	(1,681,000)	(1,130,000)
Flow-through on fixed assets	1,058,000	1,041,000	1,010,000
Flow-through on removal costs	(3,029,000)	(2,225,000)	(1,715,000)
Tax Adjustments, Release of Regulatory Liability	(5,015,000)	0	0
Investment tax credit	(69,000)	(71,000)	(71,000)
Other- net	1,003,000	393,000	409,000
Total income tax expense operations	22,869,000	35,689,000	16,346,000
Income before income taxes	$ 117,332,000	$ 138,397,000	$ 70,116,000
Effective income tax rate (as a percent)	19.50%	25.80%	23.30%

Employee Benefit Plans - Narrat

Employee Benefit Plans - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) participant item	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Initial health care cost for employees under age of 65 (as a percent)	6.30%
Ultimate health care cost for employees under age of 65 (as a percent)	3.90%
Initial Health care cost for employees of age 65 and over (as a percent)	7.20%
Ultimate health care cost for employees of age 65 and over (as a percent)	3.90%
Employer contribution to the plan	$ 3,000	$ 2,900	$ 2,700
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 2,500	$ 2,200	$ 2,000
Union plan
Defined Benefit Plan Disclosure [Line Items]
Expected long-term return on plan assets	5.75%	5.50%	5.50%
Non-union plan
Defined Benefit Plan Disclosure [Line Items]
Expected long-term return on plan assets	4%	3.90%	3.90%
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Minimum age for eligibility under the Pension Plan | item	21
Minimum period of service for eligibility under the Pension Plan	5 years
Normal retirement benefit (as a percent)	2%
Defined benefit plan number of highest consecutive years average earnings used in computing retirement benefit	5 years
Maximum number of years of credited service considered in determining retirement benefit	40 years
Number of participants in the Pension Plan | participant	882
Eligibility for employer matching contributions, period of service	3 years
Discount rate	5.70%	5.16%
Regulatory adjustment - deferred	$ 0	$ (281)	$ 0
Employer contributions	2,902	$ 2,946
Expected future employer's contribution	$ 3,400
Expected long-term return on plan assets	6%	5.75%	5.75%
Pension Benefits | GSWC
Defined Benefit Plan Disclosure [Line Items]
Regulatory adjustment - deferred	$ 600	$ (300)	$ 1,500
Pension Benefits | BVES
Defined Benefit Plan Disclosure [Line Items]
Regulatory adjustment - deferred		$ 300	500
Pension Benefits | Minimum
Defined Benefit Plan Disclosure [Line Items]
Percentage of participant's eligible pay contributed to the plan by the employer	3%
Pension Benefits | Maximum
Defined Benefit Plan Disclosure [Line Items]
Percentage of participant's eligible pay contributed to the plan by the employer	5.25%
Post-Retirement Medical Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.40%	5.04%
Regulatory adjustment - deferred	$ 0	$ 0	$ 0
Employer contributions	$ 256	$ 265
Post-Retirement Medical Benefits | Minimum | Fixed income fund
Defined Benefit Plan Disclosure [Line Items]
Maturity period of investments	1 year
Post-Retirement Medical Benefits | Maximum | Fixed income fund
Defined Benefit Plan Disclosure [Line Items]
Maturity period of investments	20 years
SERP
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.66%	5.15%
Balance in Rabbi Trust	$ 41,200

Employee Benefit Plans - Funded

Employee Benefit Plans - Funded Status of Pension Plan and Post-Retirement Medical Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension Benefits
Change in Projected Benefit Obligation:
Projected benefit obligation at beginning of year	$ 202,963	$ 190,678
Service cost	3,323	3,196	$ 5,644
Interest cost	10,241	10,142	7,401
Actuarial (gain) loss	(10,932)	8,525
Benefits/expenses paid	(10,110)	(9,578)
Projected benefit obligation at end of year	195,485	202,963	190,678
Changes in Plan Assets:
Fair value of plan assets at beginning of year	205,305	186,906
Actual return on plan assets	19,066	25,031
Employer contributions	2,902	2,946
Benefits/expenses paid	(10,111)	(9,578)
Fair value of plan assets at end of year	217,162	205,305	186,906
Funded Status:
Overfunded/(underfunded) amount recognized	21,677	2,342
Post-Retirement Medical Benefits
Change in Projected Benefit Obligation:
Projected benefit obligation at beginning of year	1,965	2,014
Service cost	128	130	129
Interest cost	98	106	60
Actuarial (gain) loss	(45)	49
Benefits/expenses paid	(264)	(334)
Projected benefit obligation at end of year	1,882	1,965	2,014
Changes in Plan Assets:
Fair value of plan assets at beginning of year	12,827	11,240
Actual return on plan assets	1,894	1,921
Employer contributions	256	265
Benefits/expenses paid	(521)	(599)
Fair value of plan assets at end of year	14,456	12,827	$ 11,240
Funded Status:
Overfunded/(underfunded) amount recognized	$ 12,574	$ 10,862

Employee Benefit Plans - Pensio

Employee Benefit Plans - Pension Benefits and Post-Retirement Medical Benefits Recognized on Balance Sheet (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Amounts recognized on the balance sheets:
Non-current liabilities	$ (33,816)	$ (32,652)
Pension Benefits
Amounts recognized on the balance sheets:
Non-current assets	21,677	2,342
Current liabilities	0	0
Non-current liabilities	0	0
Net amount recognized	21,677	2,342
Amounts recognized in regulatory assets (liabilities) consist of:
Prior service cost (credit)	1,020	1,454
Net loss (gain)	(19,867)	(1,899)
Regulatory assets (liabilities)	(18,847)	(445)	$ 6,012
Prefunded plan costs	(2,830)	(1,897)
Net liability (asset) recognized	(21,677)	(2,342)
Changes in plan assets and benefit obligations recognized in regulatory assets (liabilities):
Regulatory asset (liability) at beginning of year	(445)	6,012
Net loss (gain)	(17,968)	(6,023)
New prior service cost	0	0
Amortization of prior service (cost) credit	(434)	(434)
Amortization of net gain (loss)	0	0
Total change in regulatory asset (liability)	(18,402)	(6,457)
Regulatory asset (liability) at end of year	(18,847)	(445)	6,012
Net periodic pension costs	1,968	3,289	$ 313
Change in regulatory asset (liability)	(18,402)	(6,457)
Total recognized in net periodic pension cost and regulatory asset (liability)	(16,434)	(3,168)
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	195,485	202,963
Accumulated benefit obligation	186,679	192,986
Fair value of plan assets	$ 217,162	$ 205,305
Weighted-average assumptions used to determine benefit obligations at December 31:
Discount rate	5.70%	5.16%
Pension Benefits | Minimum
Weighted-average assumptions used to determine benefit obligations at December 31:
Rate of compensation increase	2.50%	2.50%	2.50%
Pension Benefits | Maximum
Weighted-average assumptions used to determine benefit obligations at December 31:
Rate of compensation increase	6%	6%	6%
Post-Retirement Medical Benefits
Amounts recognized on the balance sheets:
Non-current assets	$ 12,574	$ 10,862
Current liabilities	0	0
Non-current liabilities	0	0
Net amount recognized	12,574	10,862
Amounts recognized in regulatory assets (liabilities) consist of:
Prior service cost (credit)	0	0
Net loss (gain)	(6,531)	(6,272)
Regulatory assets (liabilities)	(6,531)	(6,272)	$ (5,846)
Prefunded plan costs	(6,043)	(4,590)
Net liability (asset) recognized	(12,574)	(10,862)
Changes in plan assets and benefit obligations recognized in regulatory assets (liabilities):
Regulatory asset (liability) at beginning of year	(6,272)	(5,846)
Net loss (gain)	(1,371)	(1,395)
New prior service cost	0	0
Amortization of prior service (cost) credit	0	0
Amortization of net gain (loss)	1,112	969
Total change in regulatory asset (liability)	(259)	(426)
Regulatory asset (liability) at end of year	(6,531)	(6,272)	(5,846)
Net periodic pension costs	(1,453)	(1,210)	$ (2,132)
Change in regulatory asset (liability)	(259)	(426)
Total recognized in net periodic pension cost and regulatory asset (liability)	(1,712)	(1,636)
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	1,882	1,965
Fair value of plan assets	$ 14,456	$ 12,827
Weighted-average assumptions used to determine benefit obligations at December 31:
Discount rate	5.40%	5.04%

Employee Benefit Plans - Compon

Employee Benefit Plans - Components of Net Periodic Pension Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Union plan
Weighted-average assumptions used to determine net periodic cost:
Expected long-term return on plan assets	5.75%	5.50%	5.50%
Non-union plan
Weighted-average assumptions used to determine net periodic cost:
Expected long-term return on plan assets	4%	3.90%	3.90%
Pension Benefits
Components of Net Periodic Benefits Cost:
Service cost	$ 3,323	$ 3,196	$ 5,644
Interest cost	10,241	10,142	7,401
Expected return on plan assets	(12,030)	(10,483)	(13,166)
Amortization of prior service cost (credit)	434	434	434
Amortization of actuarial (gain) loss	0	0	0
Net periodic pension cost under accounting standards	1,968	3,289	313
Regulatory adjustment	0	(281)	0
Total expense recognized, before surcharges and allocation to overhead pool	$ 1,968	$ 3,008	$ 313
Weighted-average assumptions used to determine net periodic cost:
Discount rate	5.16%	5.41%	2.89%
Expected long-term return on plan assets	6%	5.75%	5.75%
Pension Benefits | Minimum
Weighted-average assumptions used to determine net periodic cost:
Rate of compensation increase	2.50%	2.50%	2.50%
Pension Benefits | Maximum
Weighted-average assumptions used to determine net periodic cost:
Rate of compensation increase	6%	6%	6%
Post-Retirement Medical Benefits
Components of Net Periodic Benefits Cost:
Service cost	$ 128	$ 130	$ 129
Interest cost	98	106	60
Expected return on plan assets	(567)	(477)	(587)
Amortization of prior service cost (credit)	0	0	0
Amortization of actuarial (gain) loss	(1,112)	(969)	(1,734)
Net periodic pension cost under accounting standards	(1,453)	(1,210)	(2,132)
Regulatory adjustment	0	0	0
Total expense recognized, before surcharges and allocation to overhead pool	$ (1,453)	$ (1,210)	$ (2,132)
Weighted-average assumptions used to determine net periodic cost:
Discount rate	5.04%	5.34%	2.46%

Employee Benefit Plans - Asset

Employee Benefit Plans - Asset Allocation (Details)	Dec. 31, 2024	Dec. 31, 2023
Pension Benefits
Employee benefit plans
Actual Asset Allocations:	100%	100%
Target Asset Allocations:	100%	100%
Pension Benefits | Equity securities
Employee benefit plans
Actual Asset Allocations:	56%	56%
Target Asset Allocations:	60%	60%
Pension Benefits | Debt securities
Employee benefit plans
Actual Asset Allocations:	39%	39%
Target Asset Allocations:	40%	40%
Pension Benefits | Real Estate Funds
Employee benefit plans
Actual Asset Allocations:	5%	5%
Pension Benefits | Cash equivalents
Employee benefit plans
Actual Asset Allocations:	0%	0%
Post-Retirement Medical Benefits
Employee benefit plans
Actual Asset Allocations:	100%	100%
Target Asset Allocations:	100%	100%
Post-Retirement Medical Benefits | Equity securities
Employee benefit plans
Actual Asset Allocations:	59%	60%
Target Asset Allocations:	60%	60%
Post-Retirement Medical Benefits | Debt securities
Employee benefit plans
Actual Asset Allocations:	40%	39%
Target Asset Allocations:	40%	40%
Post-Retirement Medical Benefits | Real Estate Funds
Employee benefit plans
Actual Asset Allocations:	0%	0%
Post-Retirement Medical Benefits | Cash equivalents
Employee benefit plans
Actual Asset Allocations:	1%	1%

Employee Benefit Plans - Schedu

Employee Benefit Plans - Schedule of Fair Value Measured by Net Asset Value (Details) - Pension Benefits - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Employee benefit plans
Fair Value	$ 217,162	$ 205,305	$ 186,906
Unfunded Commitments	0	0
Cash equivalents
Employee benefit plans
Fair Value	939	814
Unfunded Commitments	0	0
Fixed income fund
Employee benefit plans
Fair Value	84,394	80,737
Unfunded Commitments	0	0
Total equity funds
Employee benefit plans
Fair Value	121,629	114,309
Unfunded Commitments	0
U.S. small/mid cap funds
Employee benefit plans
Fair Value	21,324	19,162
Unfunded Commitments	0	0
U.S. large cap funds
Employee benefit plans
Fair Value	53,819	49,770
Unfunded Commitments	0	0
International funds
Employee benefit plans
Fair Value	46,486	45,377
Unfunded Commitments	0	0
Real estate funds
Employee benefit plans
Fair Value	10,200	9,445
Unfunded Commitments	$ 0	$ 0

Employee Benefit Plans - Fair V

Employee Benefit Plans - Fair Value Hierarchy (Details) - Post-Retirement Medical Benefits - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Employee benefit plans
Total investments measured at fair value	$ 14,456	$ 12,827	$ 11,240
Fair Value
Employee benefit plans
Total investments measured at fair value	14,456	12,827
Level 1
Employee benefit plans
Total investments measured at fair value	14,456	12,827
Level 2
Employee benefit plans
Total investments measured at fair value	0	0
Level 3
Employee benefit plans
Total investments measured at fair value	0	0
Cash equivalents | Fair Value
Employee benefit plans
Total investments measured at fair value	110	189
Cash equivalents | Level 1
Employee benefit plans
Total investments measured at fair value	110	189
Cash equivalents | Level 2
Employee benefit plans
Total investments measured at fair value	0	0
Cash equivalents | Level 3
Employee benefit plans
Total investments measured at fair value	0	0
Fixed income fund | Fair Value
Employee benefit plans
Total investments measured at fair value	5,818	5,001
Fixed income fund | Level 1
Employee benefit plans
Total investments measured at fair value	5,818	5,001
Fixed income fund | Level 2
Employee benefit plans
Total investments measured at fair value	0	0
Fixed income fund | Level 3
Employee benefit plans
Total investments measured at fair value	0	0
U.S. equity securities | Fair Value
Employee benefit plans
Total investments measured at fair value	8,528	7,637
U.S. equity securities | Level 1
Employee benefit plans
Total investments measured at fair value	8,528	$ 7,637
U.S. equity securities | Level 2
Employee benefit plans
Total investments measured at fair value	0
U.S. equity securities | Level 3
Employee benefit plans
Total investments measured at fair value	$ 0

Employee Benefit Plans - Future

Employee Benefit Plans - Future Benefit Payments (Details) $ in Thousands	Dec. 31, 2024 USD ($)
Pension Benefits
Employee benefit plans
2025	$ 11,235
2026	11,686
2027	12,255
2028	12,775
2029	13,458
Thereafter	72,271
Total	133,680
Post-Retirement Medical Benefits
Employee benefit plans
2025	282
2026	285
2027	264
2028	242
2029	182
Thereafter	693
Total	$ 1,948

Employee Benefit Plans - Fair_2

Employee Benefit Plans - Fair Value of Assets (Details) - SERP - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Employee benefit plans
Total investments measured at fair value	$ 0	$ 0
Rabbi Trust | Fair Value
Employee benefit plans
Total investments measured at fair value	41,187	34,143
Level 1 | Rabbi Trust
Employee benefit plans
Total investments measured at fair value	41,187	34,143
Level 2 | Rabbi Trust
Employee benefit plans
Total investments measured at fair value	0	0
Level 3 | Rabbi Trust
Employee benefit plans
Total investments measured at fair value	0	0
Cash equivalents | Rabbi Trust | Fair Value
Employee benefit plans
Total investments measured at fair value	11	6
Cash equivalents | Level 1 | Rabbi Trust
Employee benefit plans
Total investments measured at fair value	11	6
Cash equivalents | Level 2 | Rabbi Trust
Employee benefit plans
Total investments measured at fair value	0	0
Cash equivalents | Level 3 | Rabbi Trust
Employee benefit plans
Total investments measured at fair value	0	0
Fixed income securities | Rabbi Trust | Fair Value
Employee benefit plans
Total investments measured at fair value	16,698	13,676
Fixed income securities | Level 1 | Rabbi Trust
Employee benefit plans
Total investments measured at fair value	16,698	13,676
Fixed income securities | Level 2 | Rabbi Trust
Employee benefit plans
Total investments measured at fair value	0	0
Fixed income securities | Level 3 | Rabbi Trust
Employee benefit plans
Total investments measured at fair value	0	0
Equity securities | Rabbi Trust | Fair Value
Employee benefit plans
Total investments measured at fair value	24,478	20,461
Equity securities | Level 1 | Rabbi Trust
Employee benefit plans
Total investments measured at fair value	24,478	20,461
Equity securities | Level 2 | Rabbi Trust
Employee benefit plans
Total investments measured at fair value	0	0
Equity securities | Level 3 | Rabbi Trust
Employee benefit plans
Total investments measured at fair value	$ 0	$ 0

Employee Benefit Plans - Reconc

Employee Benefit Plans - Reconciliation of Benefit Obligations and Change in Benefit Obligation (Details) - SERP - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Change in Benefit Obligation:
Projected benefit obligation at beginning of year	$ 33,594	$ 30,807
Service cost	1,430	1,248	$ 1,191
Interest cost	1,706	1,644	1,022
Actuarial (gain) loss	(1,028)	840
Benefits paid	(944)	(945)
Projected benefit obligation at end of year	34,758	33,594	$ 30,807
Changes in Plan Assets:
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
Funded Status:
Net amount recognized as accrued pension cost	$ (34,758)	$ (33,594)

Employee Benefit Plans - Sche_2

Employee Benefit Plans - Schedule of Defined Benefit Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Amounts recognized on the balance sheets:
Non-current liabilities	$ (33,816)	$ (32,652)
SERP
Amounts recognized on the balance sheets:
Current liabilities	(942)	(942)
Non-current liabilities	(33,816)	(32,652)
Net amount recognized	(34,758)	(33,594)
Amounts recognized in regulatory assets (liabilities) consist of:
Prior service cost (credit)	0	0
Net loss	1,855	2,869
Regulatory assets (liabilities)	1,855	2,869	$ 1,995
Unfunded accrued cost	32,903	30,725
Net liability (asset) recognized	34,758	33,594
Changes in plan assets and benefit obligations recognized in regulatory assets (liabilities):
Regulatory asset (liability) at beginning of year	2,869	1,995
Net (gain) loss	(1,028)	840
Amortization of prior service credit	0	0
Amortization of net loss	14	34
Total change in regulatory asset (liability)	(1,014)	874
Regulatory asset (liability) at end of year	1,855	2,869	1,995
Net periodic pension costs	3,122	2,858	2,793
Change in regulatory asset (liability)	(1,014)	874
Total recognized in net periodic pension cost and regulatory asset (liability)	2,108	3,732
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	34,758	33,594	$ 30,807
Accumulated benefit obligation	33,196	30,794
Fair value of plan assets	$ 0	$ 0
Weighted-average assumptions used to determine benefit obligations at December 31:
Discount rate	5.66%	5.15%
SERP | Maximum
Weighted-average assumptions used to determine benefit obligations at December 31:
Rate of compensation increase	4%	4%
SERP | Minimum
Weighted-average assumptions used to determine benefit obligations at December 31:
Rate of compensation increase	4.50%	4.50%

Employee Benefit Plans - Comp_2

Employee Benefit Plans - Components of SERP Expense (Details) - SERP - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Components of Net Periodic Benefits Cost:
Service cost	$ 1,430	$ 1,248	$ 1,191
Interest cost	1,706	1,644	1,022
Amortization of net (gain) loss	(14)	(34)	580
Net periodic pension cost under accounting standards	$ 3,122	$ 2,858	$ 2,793
Weighted-average assumptions used to determine net periodic cost:
Discount rate	5.15%	5.42%	2.87%
Minimum
Weighted-average assumptions used to determine net periodic cost:
Rate of compensation increase	4.50%	4.50%
Maximum
Weighted-average assumptions used to determine net periodic cost:
Rate of compensation increase	4%	4%

Employee Benefit Plans - Estima

Employee Benefit Plans - Estimated Future Benefit Payments for SERP (Details) - SERP $ in Thousands	Dec. 31, 2024 USD ($)
Employee benefit plans
2025	$ 942
2026	2,656
2027	2,834
2028	2,806
2029	2,901
Thereafter	14,489
Total	$ 26,628

Stock-Based Compensation Plan_2

Stock-Based Compensation Plans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) stock_plan shares	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Stock compensation plans
Number of stock incentive plans | stock_plan	3
Vesting period	3 years
Unrecognized compensation cost	$ 400
Stock-based compensation recognized in the income statement, before taxes	3,744	$ 3,298	$ 2,571
Capitalized equity-based compensation cost	$ 400	500	300
Immediate vesting for employees of certain age and above	55 years
GSWC
Stock compensation plans
Stock-based compensation recognized in the income statement, before taxes	$ 3,279	2,994	2,269
Capitalized equity-based compensation cost	400	500	300
Nonqualified stock options
Stock compensation plans
Tax benefits from exercise of stock-based awards	900	800	900
Nonqualified stock options | GSWC
Stock compensation plans
Tax benefits from exercise of stock-based awards	900	800	900
Restricted Stock Units | Employees and directors
Stock compensation plans
Stock-based compensation recognized in the income statement, before taxes	3,744	3,298	2,571
Restricted Stock Units | Employees and directors | GSWC
Stock compensation plans
Stock-based compensation recognized in the income statement, before taxes	$ 3,279	$ 2,994	$ 2,269
Performance awards
Stock compensation plans
Vesting period	3 years
2000 and 2008 Employee Plans | Nonqualified stock options
Stock compensation plans
Percentage of rights vesting in the third year from the date of grant	34%
2000 and 2008 Employee Plans | Restricted Stock Units
Stock compensation plans
Common stock entitled to be received under each award (in shares) | shares	1
Percentage of rights vesting in the first two years from the date of grant	33%
Percentage of rights vesting in the third year from the date of grant	34%
2000 and 2008 Employee Plans | Performance awards
Stock compensation plans
Vesting period	3 years
Percentage of rights vesting in the first two years from the date of grant	33%
Percentage of rights vesting in the third year from the date of grant	34%
2003 and 2013 Directors plans
Stock compensation plans
Vesting period	90 days
Maximum
Stock compensation plans
Chang in control, term	24 months
Weighted Average
Stock compensation plans
Expected recognition period for unrecognized compensation cost	1 year 6 months
Weighted Average | Restricted Stock [Member]
Stock compensation plans
Expected recognition period for unrecognized compensation cost	1 year 6 months 3 days

Stock-Based Compensation Plan_3

Stock-Based Compensation Plans 2 (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Additional disclosure
Vesting period	3 years
Unrecognized compensation cost	$ 400
Weighted Average Grant-Date Value
Capitalized equity-based compensation cost	$ 400	$ 500	$ 300
Maximum
Additional disclosure
Percentage of target amount of performance shares	200%
Minimum
Additional disclosure
Percentage of target amount of performance shares	0%
Weighted Average
Additional disclosure
Expected recognition period for unrecognized compensation cost	1 year 6 months
Restricted Stock Units
Additional disclosure
Unrecognized compensation cost related to performance awards	$ 700
Number of Restricted/Performance Share Units
Restricted share units at the beginning of the period (in shares)	50,327
Granted (in shares)	27,051
Vested (in shares)	(18,301)
Forfeited (in shares)	(786)
Restricted share units at the end of the period (in shares)	58,291	50,327
Weighted Average Grant-Date Value
Restricted share units at the beginning of the period (in dollars per share)	$ 54
Granted (in dollars per share)	74.02
Vested (in dollars per share)	86.27
Forfeited (in dollars per share)	80.70
Restricted share units at the end of the period (in dollars per share)	$ 52.80	$ 54
Performance awards
Additional disclosure
Vesting period	3 years
Period to meet the performance goals	3 years
Number of Restricted/Performance Share Units
Restricted share units at the beginning of the period (in shares)	65,357
Granted (in shares)	28,503
Performance criteria adjustment (in shares)	15,251
Vested (in shares)	(22,603)
Restricted share units at the end of the period (in shares)	86,508	65,357
Weighted Average Grant-Date Value
Restricted share units at the beginning of the period (in dollars per share)	$ 87.35
Granted (in dollars per share)	73.16
Performance criteria adjustment (in dollars per share)	83.31
Vested (in dollars per share)	79.54
Restricted share units at the end of the period (in dollars per share)	$ 84	$ 87.35
Performance awards | 2000 and 2008 Employee Plans
Additional disclosure
Vesting period	3 years
GSWC
Weighted Average Grant-Date Value
Capitalized equity-based compensation cost	$ 400	$ 500	$ 300
American States Utility Services | Maximum
Additional disclosure
Percentage of target amount of performance shares	250%

Commitments (Details)

Commitments (Details) - GSWC - Water Supply $ in Thousands	Dec. 31, 2024 USD ($)
Estimated future minimum payments
2025	$ 459
2026	405
2027	405
2028	220
2029	87
Thereafter	718
Total	$ 2,294

Commitments - Narrative (Detail

Commitments - Narrative (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2024 unit	Dec. 31, 2024 USD ($) unit
BVES
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Number of renewable energy credits that would be purchased | unit		578,000
Bundled Purchased Renewable Energy Credits Number | unit		587,000
Purchased Renewable Energy Credits Number Delivered in 2023 | unit		60,000
Purchased Renewable Energy Credits Number Delivered in 2024 | unit	15,000
BVES | Renewables Portfolio Standard
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Derivative, term of contract		10 years
BVES | Renewables Portfolio Standard (Bundled Product)
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Derivative, term of contract		11 years
Water Supply | GSWC
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Purchase Obligation		$ 2,294
Water Supply | GSWC | Various third parties
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Remaining amount of commitment		1,100
Water Supply | GSWC | Other various third parties
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Purchase Obligation		1,200
Electric Power Purchase Commitments | BVES
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Purchase Obligation		41,100
Electric Renewable Energy Credit Purchase Commitments | BVES
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Purchase Obligation		$ 8,900
Minimum | BVES
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Derivative, Term of Contract		3 years
Minimum | BVES | Purchase power contract
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Derivative, Term of Contract		3 years
Maximum | BVES
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Derivative, Term of Contract		5 years
Maximum | BVES | Purchase power contract
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Derivative, Term of Contract		5 years

Contingencies (Details)

Contingencies (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) item unit
Contingencies
Environmental Loss Contingency Statement OfFinancial Position Extensible Enumeration Not Disclosed Flag	estimated remaining cost
American States Utility Services | Contracted services:
Contingencies
Number of the contracts with 15-year contracts with the U.S. government | unit	1
American States Utility Services | Contracted services: | Minimum
Contingencies
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases	15 years
American States Utility Services | Contracted services: | Maximum
Contingencies
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases	50 years
Environmental Clean-Up and Remediation | GSWC
Contingencies
Number of Plant Sites | item	1
Environmental Costs Recognized, Capitalized	$ 6.8
Amount paid by the State of California Underground Storage Tank Fund for clean-up and remediation of plant facilities	1.5
Accrued liability for the estimated additional cost to complete the clean-up at the site	$ 1.3

Leases - Additional information

Leases - Additional information (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Leases [Abstract]
Operating lease liabilities	$ 2,074	$ 1,856
Operating lease liabilities	6,394	6,619
Operating lease right-of-use assets	$ 8,028	$ 7,982

Leases - Supplemental lease inf

Leases - Supplemental lease information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Leases [Abstract]
Lease, Cost	$ 2,543	$ 2,486
Operating lease right-of-use assets	8,028	7,982
Short-term Lease, Cost	$ 323	$ 147
Operating Lease, Weighted Average Remaining Lease Term	3 years 10 months 13 days	4 years 6 months 18 days
Operating Lease, Weighted Average Discount Rate, Percent	4.70%	4%
Operating Lease, Payments, Use	$ 2,210	$ 565

Leases - Lessee Operating Lease

Leases - Lessee Operating Lease Liability Maturity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
2025	$ 2,422
2026	2,373
2027	2,087
2028	1,786
2029	617
Thereafter	0
Total lease payments	9,285
Less: imputed interest	817
Total lease obligations	8,468
Less: current obligations	2,074	$ 1,856
Long-term lease obligations	6,394	6,619
Operating Lease, Expense	$ 2,600	$ 2,300	$ 2,600

Business Segments - Narrative (

Business Segments - Narrative (Details)	12 Months Ended
	Dec. 31, 2024 segment
GSWC
Details of reportable segment
Number of reportable segments	1
AWR
Details of reportable segment
Number of reportable segments	3

Business Segments - Schedule by

Business Segments - Schedule by Business Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Details of reportable segment
Operating revenues	$ 595,459	$ 595,699	$ 491,528
Supply costs	123,180	131,936	109,910
Other operation	41,318	40,271	38,095
Administrative and general	100,941	88,273	86,190
Depreciation and amortization expense	43,647	42,403	41,315
Maintenance	20,255	14,218	13,392
Property and other taxes	27,091	24,046	22,894
ASUS construction	54,544	57,912	53,171
Gain on sale of assets	0	(100)	(75)
Operating Income	184,483	196,740	126,636
Interest expense	(50,382)	(42,762)	(27,027)
Interest income	7,874	7,416	2,326
(Gain) loss on investments held in a trust	5,293	5,008	(5,177)
Income tax benefit	30,173	41,599	23,664
Other segment item, income (expense)	2,173	118	5,302
Net Income	119,268	124,921	78,396
Capital additions	231,960	188,540	166,240
Depreciation on transportation equipment	600	900	400
AWR
Details of reportable segment
Income tax benefit	(1,936)	(1,714)	(597)
Net Income	119,268	124,921	78,396
GSWC
Details of reportable segment
Operating revenues	417,410	433,473	340,602
Other operation	28,349	29,064	28,117
Administrative and general	64,510	59,313	58,358
Depreciation and amortization expense	37,187	35,886	34,805
Maintenance	9,788	9,906	9,559
Property and other taxes	22,233	19,845	19,080
Gain on sale of assets	0	(100)	0
Operating Income	143,520	159,177	92,455
Interest expense	(38,532)	(31,283)	(22,742)
Interest income	6,018	5,557	1,083
(Gain) loss on investments held in a trust	5,293	5,008	(5,177)
Income tax benefit	22,869	35,689	16,346
Net Income	94,463	102,708	53,770
Depreciation on transportation equipment		200
Water | GSWC
Details of reportable segment
Operating revenues	417,410	433,473	340,602
Electric | BVES
Details of reportable segment
Operating revenues	51,645	41,832	39,986
Reportable Legal Entities
Details of reportable segment
Operating revenues	595,459	595,699	491,528
Supply costs	123,180	131,936	109,910
Other operation	41,318	40,271	38,095
Administrative and general	100,934	88,489	86,182
Depreciation and amortization expense	43,647	42,403	41,315
Maintenance	20,255	14,218	13,392
Property and other taxes	27,091	24,046	22,894
ASUS construction	54,544	57,912	53,171
Gain on sale of assets		(100)	(75)
Operating Income	184,490	196,524	126,644
Interest expense	(44,510)	(36,708)	(24,710)
Interest income	7,776	7,423	2,352
(Gain) loss on investments held in a trust	5,293	5,008	(5,177)
Income tax benefit	32,109	43,313	24,261
Other segment item, income (expense)	1,919	(151)	5,044
Net Income	122,859	128,783	79,892
Capital additions	231,960	188,540	166,240
Reportable Legal Entities | Water | GSWC
Details of reportable segment
Operating revenues	417,410	433,473	340,602
Supply costs	111,823	120,382	98,228
Other operation	28,349	29,064	28,117
Administrative and general	64,510	59,313	58,358
Depreciation and amortization expense	37,187	35,886	34,805
Maintenance	9,788	9,906	9,559
Property and other taxes	22,233	19,845	19,080
ASUS construction	0	0	0
Gain on sale of assets		(100)	0
Operating Income	143,520	159,177	92,455
Interest expense	(38,532)	(31,283)	(22,742)
Interest income	6,018	5,557	1,083
(Gain) loss on investments held in a trust	5,293	5,008	(5,177)
Income tax benefit	22,869	35,689	16,346
Other segment item, income (expense)	1,033	(62)	4,497
Net Income	94,463	102,708	53,770
Capital additions	197,355	160,939	146,730
Reportable Legal Entities | Electric | BVES
Details of reportable segment
Operating revenues	51,645	41,832	39,986
Supply costs	11,357	11,554	11,682
Other operation	3,424	4,057	3,311
Administrative and general	13,241	8,745	7,901
Depreciation and amortization expense	3,160	3,256	2,792
Maintenance	5,901	924	723
Property and other taxes	2,399	2,100	1,837
ASUS construction	0	0	0
Gain on sale of assets		0	0
Operating Income	12,163	11,196	11,740
Interest expense	(3,812)	(3,298)	(1,225)
Interest income	976	1,060	394
(Gain) loss on investments held in a trust	0	0	0
Income tax benefit	2,541	1,515	2,439
Other segment item, income (expense)	968	36	406
Net Income	7,754	7,479	8,876
Capital additions	29,980	25,372	18,069
Reportable Legal Entities | Contracted services: | American States Utility Services
Details of reportable segment
Operating revenues	126,404	120,394	110,940
Supply costs	0	0	0
Other operation	9,545	7,150	6,667
Administrative and general	23,183	20,431	19,923
Depreciation and amortization expense	3,300	3,261	3,718
Maintenance	4,566	3,388	3,110
Property and other taxes	2,459	2,101	1,977
ASUS construction	54,544	57,912	53,171
Gain on sale of assets		0	(75)
Operating Income	28,807	26,151	22,449
Interest expense	(2,166)	(2,127)	(743)
Interest income	782	806	875
(Gain) loss on investments held in a trust	0	0	0
Income tax benefit	6,699	6,109	5,476
Other segment item, income (expense)	(82)	(125)	141
Net Income	20,642	18,596	17,246
Capital additions	4,625	2,229	1,441
Intersegment Eliminations | AWR
Details of reportable segment
Operating revenues	0	0	0
Supply costs	0	0	0
Other operation	0	0	0
Administrative and general	7	(216)	8
Depreciation and amortization expense	0	0	0
Maintenance	0	0	0
Property and other taxes	0	0	0
ASUS construction	0	0	0
Gain on sale of assets		0	0
Operating Income	(7)	216	(8)
Interest expense	(5,872)	(6,054)	(2,317)
Interest income	98	(7)	(26)
(Gain) loss on investments held in a trust	0	0	0
Income tax benefit	(1,936)	(1,714)	(597)
Other segment item, income (expense)	254	269	258
Net Income	(3,591)	(3,862)	(1,496)
Capital additions	$ 0	$ 0	$ 0

Business Segments - Schedule of

Business Segments - Schedule of Reconciling Property Plant and Equipment to Consolidated Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting, Asset Reconciling Item [Line Items]
Total utility plant	$ 2,099,625	$ 1,892,280
Other assets	400,584	353,842
Total Assets	2,500,209	2,246,122
AWR
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets	1,045,732	922,901
GSWC
Segment Reporting, Asset Reconciling Item [Line Items]
Total utility plant	1,911,369	1,735,534
Total Assets	2,131,981	1,916,155
Reportable Legal Entities
Segment Reporting, Asset Reconciling Item [Line Items]
Total utility plant	2,099,625	1,892,280
Other assets	396,939	349,725
Total Assets	2,496,564	2,242,005
Reportable Legal Entities | Water | GSWC
Segment Reporting, Asset Reconciling Item [Line Items]
Total utility plant	1,911,369	1,735,534
Other assets	220,612	180,621
Total Assets	2,131,981	1,916,155
Reportable Legal Entities | Electric | BVES
Segment Reporting, Asset Reconciling Item [Line Items]
Total utility plant	170,349	140,279
Other assets	50,048	35,241
Total Assets	220,397	175,520
Reportable Legal Entities | Contracted services: | American States Utility Services
Segment Reporting, Asset Reconciling Item [Line Items]
Total utility plant	17,907	16,467
Other assets	126,279	133,863
Total Assets	144,186	150,330
Intersegment Eliminations
Segment Reporting, Asset Reconciling Item [Line Items]
Total utility plant	0	0
Other assets	(1,042,087)	(918,784)
Total Assets	(1,042,087)	(918,784)
Intersegment Eliminations | AWR
Segment Reporting, Asset Reconciling Item [Line Items]
Total utility plant	0	0
Other assets	1,045,732	922,901
Total Assets	$ 1,045,732	$ 922,901

Allowance for Doubtful Accoun_3

Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Changes in allowance for doubtful accounts
Balance at beginning of year	$ 3,569	$ 3,590	$ 4,440	$ 3,569
Provision charged to expense		1,717	932	2,842
Allowance for doubtful accounts receivable charge offs net of recoveries		(1,629)	(1,782)	(1,971)
Balance at end of year		3,678	3,590	4,440
Components of allowance for doubtful accounts
Allowance for doubtful accounts related to accounts receivable-customer		3,568	3,537	4,387
Allowance for doubtful accounts related to other accounts receivable		110	53	53
Total allowance for doubtful accounts		3,678	3,590	4,440
GSWC
Changes in allowance for doubtful accounts
Balance at beginning of year	3,221	3,447	4,196	3,221
Provision charged to expense		1,366	754	2,501
Allowance for doubtful accounts receivable charge offs net of recoveries		(1,335)	(1,503)	(1,526)
Balance at end of year		3,478	3,447	4,196
Components of allowance for doubtful accounts
Allowance for doubtful accounts related to accounts receivable-customer		3,368	3,394	4,143
Allowance for doubtful accounts related to other accounts receivable		110	53	53
Total allowance for doubtful accounts		3,478	$ 3,447	4,196
Relief funding	$ 9,500	$ 3,500		9,500
BVES
Components of allowance for doubtful accounts
Relief funding				$ 500

Supplemental Cash Flow Inform_3

Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Taxes and Interest Paid:
Income taxes paid	$ 27,850	$ 34,682	$ 27,370
Interest Paid, Excluding Capitalized Interest, Operating Activities	50,347	39,367	26,005
Non-Cash Transactions:
Accrued payables for investment in utility plant	49,600	34,906	40,034
Property installed by developers and conveyed	9,840	4,690	1,549
GSWC
Taxes and Interest Paid:
Income taxes paid	22,840	31,625	20,155
Interest Paid, Excluding Capitalized Interest, Operating Activities	37,994	28,099	22,294
Non-Cash Transactions:
Accrued payables for investment in utility plant	44,256	33,465	38,302
Property installed by developers and conveyed	$ 9,840	$ 4,690	$ 1,549

SCHEDULE I - CONDENSED FINANC_3

SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Assets
Cash and cash equivalents	$ 26,661	$ 14,073
Total current assets	233,346	205,978
Deferred taxes and other assets	41,264	19,874
Total Assets	2,500,209	2,246,122
Liabilities and Capitalization
Income taxes payable	481	492
Other liabilities	15,159	11,506
Total current liabilities	285,525	166,623
Notes payable to bank	165,000	291,500
Total other credits	654,251	727,835
Common shareholder’s equity	920,051	776,109	$ 709,549	$ 685,947
Total capitalization	1,560,433	1,351,664
Total liabilities and capitalization	2,500,209	2,246,122
Parent Company
Assets
Cash and cash equivalents	5,913	3,547	$ 93	$ 51
Intercompany receivable	0	116
Income taxes receivable	51	39
Intercompany note receivables	22,004	39,044
Total current assets	27,968	42,746
Investments in subsidiaries	1,006,781	870,020
Deferred taxes and other assets	10,983	10,135
Total Assets	1,045,732	922,901
Liabilities and Capitalization
Income taxes payable	3,281	2,422
Other liabilities	235	577
Total current liabilities	3,516	2,999
Notes payable to bank	120,000	141,500
Deferred taxes and other liabilities	2,165	2,293
Total other credits	122,165	143,793
Common shareholder’s equity	920,051	776,109
Total capitalization	920,051	776,109
Total liabilities and capitalization	$ 1,045,732	$ 922,901

SCHEDULE I - CONDENSED FINANC_4

SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT - Condensed Statements of Income (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Condensed financial statements
Income before income taxes	$ 149,441	$ 166,520	$ 102,060
Income tax benefit	30,173	41,599	23,664
Net Income	$ 119,268	$ 124,921	$ 78,396
Weighted Average Number of Shares Outstanding (in shares)	37,464	36,976	36,955
Basic Earnings Per Common Share (usd per share)	$ 3.17	$ 3.37	$ 2.12
Weighted Average Number of Diluted Common Shares Outstanding (in shares)	37,583	37,077	37,039
Fully Diluted Earnings per Common Share (in USD per share)	$ 3.17	$ 3.36	$ 2.11
Dividends Paid Per Common Share (in USD per share)	$ 1.791	$ 1.655	$ 1.525
Parent Company
Condensed financial statements
Operating revenues and other income	$ 0	$ 0	$ 0
Operating expenses and other expenses	5,527	5,576	2,093
Loss before equity in earnings of subsidiaries and income taxes	(5,527)	(5,576)	(2,093)
Equity in earnings of subsidiaries	122,859	128,783	79,892
Income before income taxes	117,332	123,207	77,799
Income tax benefit	(1,936)	(1,714)	(597)
Net Income	$ 119,268	$ 124,921	$ 78,396
Weighted Average Number of Shares Outstanding (in shares)	37,464	36,976	36,955
Basic Earnings Per Common Share (usd per share)	$ 3.17	$ 3.37	$ 2.12
Weighted Average Number of Diluted Common Shares Outstanding (in shares)	37,583	37,077	37,039
Fully Diluted Earnings per Common Share (in USD per share)	$ 3.17	$ 3.36	$ 2.11
Dividends Paid Per Common Share (in USD per share)	$ 1.791	$ 1.655	$ 1.525

SCHEDULE I - CONDENSED FINANC_5

SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Condensed financial statements
Net cash provided (used)	$ 198,732	$ 67,683	$ 117,799
Cash Flows From Investing Activities:
Net cash provided (used)	(232,780)	(188,764)	(167,102)
Cash Flows From Financing Activities:
Proceeds from issuance of Common Shares to AWR (parent)	88,814	0	0
Dividends paid	(67,017)	(61,195)	(56,356)
Net cash provided (used)	46,636	129,157	50,337
Net change in cash and cash equivalents	12,588	8,076	1,034
Cash and cash equivalents, beginning of period	14,073
Cash and cash equivalents, end of year	26,661	14,073
Parent Company
Condensed financial statements
Net cash provided (used)	47,069	67,041	56,398
Cash Flows From Investing Activities:
Loans (made to)/repaid from, wholly-owned subsidiaries	17,000	121,000	(81,000)
Increase in investment of subsidiary	(62,000)	(10,000)	0
Net cash provided (used)	(45,000)	111,000	(81,000)
Cash Flows From Financing Activities:
Proceeds from issuance of Common Shares to AWR (parent)	88,814	0	0
Net changes in notes payable to banks	(21,500)	(113,392)	81,000
Dividends paid	(67,017)	(61,195)	(56,356)
Net cash provided (used)	297	(174,587)	24,644
Net change in cash and cash equivalents	2,366	3,454	42
Cash and cash equivalents, beginning of period	3,547	93	51
Cash and cash equivalents, end of year	$ 5,913	$ 3,547	$ 93

SCHEDULE I - CONDENSED FINANC_6

SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT - Basis of Presentation Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jun. 05, 2024	Nov. 06, 2023	Jan. 13, 2023	Apr. 22, 2022
Note payable to banks
Line of credit facility, current borrowing capacity						$ 165,000
Exercise of stock options and other issuance of Common Shares		25,196	18,371	25,956
Issuance of Common Shares from an at-the-market program, net of issuance costs		$ 88,661
Issuance of Common Shares from an at-the-market program, net of issuance costs		$ 88,661
GSWC
Note payable to banks
Exercise of stock options and other issuance of Common Shares		2.7586	1	0
Issuance of Common Shares under stock-based compensation plans ( in shares)		$ 40,000	$ 10,000
Debt Instrument, Face Amount							$ 130,000
Issuance of Common Shares from an at-the-market program, net of issuance costs		40,000	10,000
Issuance of Common Shares from an at-the-market program, net of issuance costs		$ 40,000	$ 10,000
BVES
Note payable to banks
Exercise of stock options and other issuance of Common Shares	11
Issuance of Common Shares from an at-the-market program, net of issuance costs	$ 22,000
Issuance of Common Shares from an at-the-market program, net of issuance costs	$ 22,000
Common Stock
Note payable to banks
Exercise of stock options and other issuance of Common Shares		1,145,000
Issuance of Common Shares from an at-the-market program, net of issuance costs		$ 88,661
Issuance of Common Shares from an at-the-market program, net of issuance costs		$ 88,661
Common Stock | GSWC
Note payable to banks
Exercise of stock options and other issuance of Common Shares		2.7586	1
Issuance of Common Shares under stock-based compensation plans ( in shares)		$ 40,000
Issuance of Common Shares from an at-the-market program, net of issuance costs			$ 10,000
Issuance of Common Shares from an at-the-market program, net of issuance costs			$ 10,000
Unsecured Private Placement Notes | GSWC
Note payable to banks
Debt Instrument, Face Amount					$ 65,000		$ 130,000
Maximum | Revolving Credit Facility
Note payable to banks
Line of credit facility, current borrowing capacity								$ 280,000

SCHEDULE I - CONDENSED FINANC_7

SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT - Note Payable to Banks Narrative (Details) $ in Thousands		12 Months Ended
	Jun. 28, 2023	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Nov. 06, 2023 USD ($)	Nov. 05, 2023 USD ($)	Jun. 27, 2023 USD ($)	Apr. 22, 2022 USD ($)
Note payable to banks
Debt instrument, term	5 years
Line of credit facility, current borrowing capacity				$ 165,000
Incremental expansion of borrowing capacity					$ 75,000
Note payable to bank, noncurrent		$ 165,000	$ 291,500
Revolving Credit Facility
Note payable to banks
Line of credit facility, current borrowing capacity					$ 150,000
Letters of credit
Note payable to banks
Maximum borrowing capacity				$ 10,000
Maximum | Revolving Credit Facility
Note payable to banks
Ratio of indebtedness to net capital		0.65
Maximum | Revolving Credit Facility
Note payable to banks
Line of credit facility, current borrowing capacity							$ 280,000
AWR
Note payable to banks
Note payable to bank, noncurrent		$ 120,000	$ 141,500
AWR | Revolving Credit Facility
Note payable to banks
Debt instrument, term		5 years
Debt issuance costs, line of credit arrangements, gross		$ 600
Note payable to bank, noncurrent		$ 120,000
Total funded debt ratio		0.51
AWR | Maximum
Note payable to banks
Line of credit facility, current borrowing capacity						$ 280,000

SCHEDULE I - CONDENSED FINANC_8

SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT - Note Payable to Banks Schedule (Details) - Revolving Credit Facility - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Note payable to banks
Note payable to bank	$ 289,000	$ 333,500
Average Amount Outstanding	$ 315,811	$ 243,355
Weighted Average Annual Interest Rate (as a percent)	6.29%	6.11%
Maximum Amount Outstanding	$ 372,500	$ 333,500
AWR
Note payable to banks
Note payable to bank	$ 120,000	$ 141,500
Interest Rate at the end of the period (as a percent)	5.44%	6.45%
Average Amount Outstanding	$ 122,896	$ 156,533
Weighted Average Annual Interest Rate (as a percent)	6.29%	5.92%
Maximum Amount Outstanding	$ 145,500	$ 257,500

SCHEDULE I - CONDENSED FINANC_9

SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT - Dividend from Subsidiaries (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Subsidiaries
Dividends Payable [Line Items]
Payments of dividends from subsidiaries	$ (51.1)	$ (71.4)	$ (56.4)