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Utility Plant and Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | $ 2,052,353 | $ 1,930,224 |
Less — accumulated depreciation |  | (594,264) | (568,326) |
Construction work in progress |  | 167,915 | 150,145 |
Net utility plant |  | 1,626,004 | 1,512,043 | $ 1,415,705
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 [Member] |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 1,935,881 | 1,817,717 |
Water Service Utility Operations [Member] | Land |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 18,207 | 18,234 |
Water Service Utility Operations [Member] | Intangible Assets [Member] |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 29,028 | 28,906 |
Water Service Utility Operations [Member] | Source of water supply |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 98,244 | 92,166 |
Water Service Utility Operations [Member] | Pumping |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 209,936 | 190,901 |
Water Service Utility Operations [Member] | Water treatment |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 83,922 | 81,272 |
Water Service Utility Operations [Member] | Transmission and distribution |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 1,356,649 | 1,277,361 |
Water Service Utility Operations [Member] | General |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 139,895 | 128,877 |
Electric: |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 116,472 | 112,507 |
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 |  | 90,491 | 87,461 |
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] | 13,398 | 12,463 |
GSWC |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Less — accumulated depreciation |  | (522,672) | (502,283) |
Construction work in progress |  | 123,600 | 118,370 |
Net utility plant |  | 1,499,745 | 1,400,489 |
GSWC | Water Service Utility Operations [Member] |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 1,898,817 | 1,784,402 |
Net utility plant |  | 1,499,745 | 1,400,489 | 1,322,062
GSWC | Water Service Utility Operations [Member] | Land |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 18,207 | 18,234 |
GSWC | Water Service Utility Operations [Member] | Intangible Assets [Member] |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 29,028 | 28,906 |
GSWC | Water Service Utility Operations [Member] | Source of water supply |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 98,244 | 92,166 |
GSWC | Water Service Utility Operations [Member] | Pumping |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 209,936 | 190,901 |
GSWC | Water Service Utility Operations [Member] | Water treatment |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 83,922 | 81,272 |
GSWC | Water Service Utility Operations [Member] | Transmission and distribution |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 1,356,649 | 1,277,361 |
GSWC | Water Service Utility Operations [Member] | General |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 102,831 | 95,562 |
GSWC | Electric: |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 0 | 0 |
Net utility plant |  |  | 89,308 | $ 72,680
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, 2021 and 2020 for studies performed in association with the electric segment.

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