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Business Segments - Schedule of Business Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Details of reportable segment |  |  |  |  |  |  |  |
Total operating revenues | $ 182,716 |  |  | $ 161,782 |  |  | $ 493,795 | $ 452,361
Supply costs | 42,092 |  |  | 38,112 |  |  | 108,500 | 95,529
Other operation | 11,782 |  |  | 11,021 |  |  | 34,582 | 31,377
Administrative and general | 25,413 |  |  | 24,200 |  |  | 77,510 | 73,034
Depreciation and amortization | 11,934 |  |  | 10,849 |  |  | 35,197 | 32,341
Maintenance | 5,481 |  |  | 3,719 |  |  | 15,757 | 10,479
Property and other taxes | 7,771 |  |  | 7,063 |  |  | 21,678 | 20,162
ASUS construction | 16,510 |  |  | 11,750 |  |  | 42,333 | 43,649
Operating Income | 61,733 |  |  | 55,068 |  |  | 158,238 | 145,790
Interest expense | (11,711) |  |  | (13,225) |  |  | (35,901) | (39,217)
Interest income | 1,064 |  |  | 1,739 |  |  | 4,575 | 5,902
(Gain) loss on investments held in a trust | 2,474 |  |  | 2,071 |  |  | 4,636 | 5,116
Income tax expense | 12,925 |  |  | 10,056 |  |  | 31,622 | 27,811
Other segment items income (expense) | 532 |  |  | 237 |  |  | 1,775 | 1,053
Net Income | 41,167 | $ 33,690 | $ 26,844 | 35,834 | $ 31,864 | $ 23,135 | 101,701 | 90,833
Capital additions | 54,646 |  |  | 64,179 |  |  | 173,127 | 173,477
Reportable Legal Entities |  |  |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |  |  |
Total operating revenues | 182,716 |  |  | 161,782 |  |  | 493,795 | 452,361
Supply costs | 42,092 |  |  | 38,112 |  |  | 108,500 | 95,529
Other operation | 11,782 |  |  | 11,021 |  |  | 34,582 | 31,377
Administrative and general | 25,411 |  |  | 24,198 |  |  | 77,505 | 73,029
Depreciation and amortization | 11,934 |  |  | 10,849 |  |  | 35,197 | 32,341
Maintenance | 5,481 |  |  | 3,719 |  |  | 15,757 | 10,479
Property and other taxes | 7,771 |  |  | 7,063 |  |  | 21,678 | 20,162
ASUS construction | 16,510 |  |  | 11,750 |  |  | 42,333 | 43,649
Operating Income | 61,735 |  |  | 55,070 |  |  | 158,243 | 145,795
Interest expense | (9,843) |  |  | (11,833) |  |  | (31,266) | (34,467)
Interest income | 1,052 |  |  | 1,712 |  |  | 4,535 | 5,829
(Gain) loss on investments held in a trust | 2,474 |  |  | 2,071 |  |  | 4,636 | 5,116
Income tax expense | 13,619 |  |  | 10,788 |  |  | 33,337 | 29,502
Other segment items income (expense) | 476 |  |  | 237 |  |  | 1,310 | 796
Net Income | 42,275 |  |  | 36,469 |  |  | 104,121 | 93,567
Capital additions | 54,646 |  |  | 64,179 |  |  | 173,127 | 173,477
AWR | Intersegment Eliminations |  |  |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |  |  |
Total operating revenues | 0 |  |  | 0 |  |  | 0 | 0
Supply costs | 0 |  |  | 0 |  |  | 0 | 0
Other operation | 0 |  |  | 0 |  |  | 0 | 0
Administrative and general | 2 |  |  | 2 |  |  | 5 | 5
Depreciation and amortization | 0 |  |  | 0 |  |  | 0 | 0
Maintenance | 0 |  |  | 0 |  |  | 0 | 0
Property and other taxes | 0 |  |  | 0 |  |  | 0 | 0
ASUS construction | 0 |  |  | 0 |  |  | 0 | 0
Operating Income | (2) |  |  | (2) |  |  | (5) | (5)
Interest expense | (1,868) |  |  | (1,392) |  |  | (4,635) | (4,750)
Interest income | 12 |  |  | 27 |  |  | 40 | 73
(Gain) loss on investments held in a trust | 0 |  |  | 0 |  |  | 0 | 0
Income tax expense | (694) |  |  | (732) |  |  | (1,715) | (1,691)
Other segment items income (expense) | 56 |  |  | 0 |  |  | 465 | 257
Net Income | (1,108) |  |  | (635) |  |  | (2,420) | (2,734)
Capital additions | 0 |  |  | 0 |  |  | 0 | 0
GOLDEN STATE WATER COMPANY |  |  |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |  |  |
Total operating revenues | 132,323 |  |  | 124,043 |  |  | 354,023 | 324,732
Other operation | 8,044 |  |  | 7,807 |  |  | 23,519 | 21,829
Administrative and general | 16,632 |  |  | 16,554 |  |  | 50,241 | 49,464
Depreciation and amortization | 10,085 |  |  | 9,070 |  |  | 29,804 | 27,147
Maintenance | 2,601 |  |  | 2,209 |  |  | 7,429 | 6,247
Property and other taxes | 6,364 |  |  | 5,901 |  |  | 17,698 | 16,625
Operating Income | 49,419 |  |  | 46,846 |  |  | 126,772 | 116,578
Interest expense | (8,552) |  |  | (9,862) |  |  | (27,145) | (28,970)
Interest income | 511 |  |  | 1,504 |  |  | 2,719 | 4,589
(Gain) loss on investments held in a trust |  |  |  |  |  |  | 4,636 | 5,116
Income tax expense | 10,863 |  |  | 9,228 |  |  | 26,473 | 23,539
Net Income | 33,298 | $ 28,140 | $ 19,906 | 31,566 | $ 25,195 | $ 17,794 | 81,344 | 74,555
GOLDEN STATE WATER COMPANY | Water: |  |  |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |  |  |
Total operating revenues | 132,323 |  |  | 124,043 |  |  | 354,023 | 324,732
GOLDEN STATE WATER COMPANY | Reportable Legal Entities | Water: |  |  |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |  |  |
Total operating revenues | 132,323 |  |  | 124,043 |  |  | 354,023 | 324,732
Supply costs | 39,178 |  |  | 35,656 |  |  | 98,560 | 86,842
Other operation | 8,044 |  |  | 7,807 |  |  | 23,519 | 21,829
Administrative and general | 16,632 |  |  | 16,554 |  |  | 50,241 | 49,464
Depreciation and amortization | 10,085 |  |  | 9,070 |  |  | 29,804 | 27,147
Maintenance | 2,601 |  |  | 2,209 |  |  | 7,429 | 6,247
Property and other taxes | 6,364 |  |  | 5,901 |  |  | 17,698 | 16,625
ASUS construction | 0 |  |  | 0 |  |  | 0 | 0
Operating Income | 49,419 |  |  | 46,846 |  |  | 126,772 | 116,578
Interest expense | (8,552) |  |  | (9,862) |  |  | (27,145) | (28,970)
Interest income | 511 |  |  | 1,504 |  |  | 2,719 | 4,589
(Gain) loss on investments held in a trust | 2,474 |  |  | 2,071 |  |  | 4,636 | 5,116
Income tax expense | 10,863 |  |  | 9,228 |  |  | 26,473 | 23,539
Other segment items income (expense) | 309 |  |  | 235 |  |  | 835 | 781
Net Income | 33,298 |  |  | 31,566 |  |  | 81,344 | 74,555
Capital additions | 47,518 |  |  | 51,466 |  |  | 148,597 | 147,093
BVES | Electric: |  |  |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |  |  |
Total operating revenues | 13,332 |  |  | 9,040 |  |  | 41,262 | 29,948
BVES | Reportable Legal Entities | Electric: |  |  |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |  |  |
Total operating revenues | 13,332 |  |  | 9,040 |  |  | 41,262 | 29,948
Supply costs | 2,914 |  |  | 2,456 |  |  | 9,940 | 8,687
Other operation | 1,179 |  |  | 797 |  |  | 3,499 | 2,716
Administrative and general | 3,116 |  |  | 2,042 |  |  | 9,862 | 6,745
Depreciation and amortization | 934 |  |  | 944 |  |  | 2,718 | 2,721
Maintenance | 1,612 |  |  | 183 |  |  | 4,248 | 961
Property and other taxes | 727 |  |  | 576 |  |  | 2,063 | 1,702
ASUS construction | 0 |  |  | 0 |  |  | 0 | 0
Operating Income | 2,850 |  |  | 2,042 |  |  | 8,932 | 6,416
Interest expense | (1,239) |  |  | (1,357) |  |  | (3,577) | (3,810)
Interest income | 334 |  |  | 11 |  |  | 1,208 | 648
(Gain) loss on investments held in a trust | 0 |  |  | 0 |  |  | 0 | 0
Income tax expense | 400 |  |  | 135 |  |  | 1,532 | 656
Other segment items income (expense) | 172 |  |  | 21 |  |  | 488 | 68
Net Income | 1,717 |  |  | 582 |  |  | 5,519 | 2,666
Capital additions | 5,498 |  |  | 11,862 |  |  | 19,480 | 23,023
ASUS | Reportable Legal Entities | Contracted services: |  |  |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |  |  |
Total operating revenues | 37,061 |  |  | 28,699 |  |  | 98,510 | 97,681
Supply costs | 0 |  |  | 0 |  |  | 0 | 0
Other operation | 2,559 |  |  | 2,417 |  |  | 7,564 | 6,832
Administrative and general | 5,663 |  |  | 5,602 |  |  | 17,402 | 16,820
Depreciation and amortization | 915 |  |  | 835 |  |  | 2,675 | 2,473
Maintenance | 1,268 |  |  | 1,327 |  |  | 4,080 | 3,271
Property and other taxes | 680 |  |  | 586 |  |  | 1,917 | 1,835
ASUS construction | 16,510 |  |  | 11,750 |  |  | 42,333 | 43,649
Operating Income | 9,466 |  |  | 6,182 |  |  | 22,539 | 22,801
Interest expense | (52) |  |  | (614) |  |  | (544) | (1,687)
Interest income | 207 |  |  | 197 |  |  | 608 | 592
(Gain) loss on investments held in a trust | 0 |  |  | 0 |  |  | 0 | 0
Income tax expense | 2,356 |  |  | 1,425 |  |  | 5,332 | 5,307
Other segment items income (expense) | (5) |  |  | (19) |  |  | (13) | (53)
Net Income | 7,260 |  |  | 4,321 |  |  | 17,258 | 16,346
Capital additions | 1,630 |  |  | 851 |  |  | 5,050 | 3,361
Golden State Water Company and Bear Valley Electric Service Inc. |  |  |  |  |  |  |  |
Details of reportable segment |  |  |  |  |  |  |  |
Depreciation on transportation equipment | $ 200 |  |  | $ 200 |  |  | $ 700 | $ 500

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