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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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- Definition Tabular disclosure of public utility physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation expense and method used, including composite depreciation, and accumulated depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 980 -SubTopic 20 -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481834/980-20-45-1 + Details
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