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Utility Plant and Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | $ 2,178,349 | $ 2,052,353 |
Less — accumulated depreciation |  | (606,231) | (594,264) |
Construction work in progress |  | 181,648 | 167,915 |
Net utility plant |  | 1,753,766 | 1,626,004 | $ 1,512,043
American States Utility Services | Intangible Assets [Member] |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 571 | 571 |
Water Service Utility Operations |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 2,044,534 | 1,935,881 |
Water Service Utility Operations | Land |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 18,427 | 18,207 |
Water Service Utility Operations | Intangible Assets [Member] |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 30,511 | 29,028 |
Water Service Utility Operations | Source of water supply |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 109,918 | 98,244 |
Water Service Utility Operations | Pumping |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 227,668 | 209,936 |
Water Service Utility Operations | Water treatment |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 90,411 | 83,922 |
Water Service Utility Operations | Transmission and distribution |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 1,431,437 | 1,356,649 |
Water Service Utility Operations | General |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 136,162 | 139,895 |
Electric: |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 133,815 | 116,472 |
Electric: | Intangible Assets [Member] |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 1,200 | 1,200 |
Electric: | Transmission and distribution |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 105,499 | 90,491 |
Electric: | Generation |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 12,583 | 12,583 |
Electric: | General |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost | [1] | 15,733 | 13,398 |
GSWC |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Less — accumulated depreciation |  | (530,925) | (522,672) |
Construction work in progress |  | 141,175 | 123,600 |
Net utility plant |  | 1,616,718 | 1,499,745 |
GSWC | Water Service Utility Operations |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 2,006,468 | 1,898,817 |
Net utility plant |  | 1,616,718 | 1,499,745 | 1,400,489
GSWC | Water Service Utility Operations | Land |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 18,427 | 18,207 |
GSWC | Water Service Utility Operations | Intangible Assets [Member] |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 30,511 | 29,028 |
GSWC | Water Service Utility Operations | Source of water supply |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 109,918 | 98,244 |
GSWC | Water Service Utility Operations | Pumping |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 227,668 | 209,936 |
GSWC | Water Service Utility Operations | Water treatment |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 90,411 | 83,922 |
GSWC | Water Service Utility Operations | Transmission and distribution |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 1,431,437 | 1,356,649 |
GSWC | Water Service Utility Operations | General |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 98,096 | 102,831 |
GSWC | Electric: |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 0 | 0 |
Net utility plant |  |  | 106,508 | $ 89,308
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: | General |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost | [1] | $ 0 | $ 0 |
[1] | Includes intangible assets of $1.2 million for the years ended December 31, 2022 and 2021 for studies performed in association with the electric segment.

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