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Utility Plant and Intangible Assets - By Major Asset Class (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | $ 2,279,621 | $ 2,178,349 |
Less — accumulated depreciation |  | (624,472) | (606,231) |
Construction work in progress |  | 237,131 | 181,648 |
Net utility plant |  | 1,892,280 | 1,753,766 | $ 1,626,004
Water |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 2,123,150 | 2,044,534 |
Water | Land |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 18,290 | 18,427 |
Water | Intangible assets |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 30,917 | 30,511 |
Water | Source of water supply |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 111,112 | 109,918 |
Water | Pumping |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 234,264 | 227,668 |
Water | Water treatment |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 98,533 | 90,411 |
Water | Transmission and distribution |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 1,489,974 | 1,431,437 |
Water | Other |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 140,060 | 136,162 |
Electric: |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 156,471 | 133,815 |
Electric: | Intangible assets |  |  |  |
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 |  | 126,143 | 105,499 |
Electric: | Generation |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 12,583 | 12,583 |
Electric: | Other |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost | [1] | 17,745 | 15,733 |
GSWC |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Less — accumulated depreciation |  | (543,135) | (530,925) |
Construction work in progress |  | 195,742 | 141,175 |
Net utility plant |  | 1,735,534 | 1,616,718 |
GSWC | Water |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 2,082,927 | 2,006,468 |
Net utility plant |  | 1,735,534 | 1,616,718 | $ 1,499,745
GSWC | Water | Land |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 18,290 | 18,427 |
GSWC | Water | Intangible assets |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 30,917 | 30,511 |
GSWC | Water | Source of water supply |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 111,112 | 109,918 |
GSWC | Water | Pumping |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 234,264 | 227,668 |
GSWC | Water | Water treatment |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 98,533 | 90,411 |
GSWC | Water | Transmission and distribution |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 1,489,974 | 1,431,437 |
GSWC | Water | Other |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |
Total utility plant, at cost |  | 99,837 | 98,096 |
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 |
[1] | Includes intangible assets of $1.2 million for the years ended December 31, 2023 and 2022 for studies performed.

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