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Business Segments - Schedule by Business Segments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Details of reportable segment |  |  |
Operating revenues | $ 595,459 | $ 595,699 | $ 491,528
Supply costs | 123,180 | 131,936 | 109,910
Other operation | 41,318 | 40,271 | 38,095
Administrative and general | 100,941 | 88,273 | 86,190
Depreciation and amortization expense | 43,647 | 42,403 | 41,315
Maintenance | 20,255 | 14,218 | 13,392
Property and other taxes | 27,091 | 24,046 | 22,894
ASUS construction | 54,544 | 57,912 | 53,171
Gain on sale of assets | 0 | (100) | (75)
Operating Income | 184,483 | 196,740 | 126,636
Interest expense | (50,382) | (42,762) | (27,027)
Interest income | 7,874 | 7,416 | 2,326
(Gain) loss on investments held in a trust | 5,293 | 5,008 | (5,177)
Income tax benefit | 30,173 | 41,599 | 23,664
Other segment item, income (expense) | 2,173 | 118 | 5,302
Net Income | 119,268 | 124,921 | 78,396
Capital additions | 231,960 | 188,540 | 166,240
Depreciation on transportation equipment | 600 | 900 | 400
AWR |  |  |
Details of reportable segment |  |  |
Income tax benefit | (1,936) | (1,714) | (597)
Net Income | 119,268 | 124,921 | 78,396
GSWC |  |  |
Details of reportable segment |  |  |
Operating revenues | 417,410 | 433,473 | 340,602
Other operation | 28,349 | 29,064 | 28,117
Administrative and general | 64,510 | 59,313 | 58,358
Depreciation and amortization expense | 37,187 | 35,886 | 34,805
Maintenance | 9,788 | 9,906 | 9,559
Property and other taxes | 22,233 | 19,845 | 19,080
Gain on sale of assets | 0 | (100) | 0
Operating Income | 143,520 | 159,177 | 92,455
Interest expense | (38,532) | (31,283) | (22,742)
Interest income | 6,018 | 5,557 | 1,083
(Gain) loss on investments held in a trust | 5,293 | 5,008 | (5,177)
Income tax benefit | 22,869 | 35,689 | 16,346
Net Income | 94,463 | 102,708 | 53,770
Depreciation on transportation equipment |  | 200 |
Water | GSWC |  |  |
Details of reportable segment |  |  |
Operating revenues | 417,410 | 433,473 | 340,602
Electric | BVES |  |  |
Details of reportable segment |  |  |
Operating revenues | 51,645 | 41,832 | 39,986
Reportable Legal Entities |  |  |
Details of reportable segment |  |  |
Operating revenues | 595,459 | 595,699 | 491,528
Supply costs | 123,180 | 131,936 | 109,910
Other operation | 41,318 | 40,271 | 38,095
Administrative and general | 100,934 | 88,489 | 86,182
Depreciation and amortization expense | 43,647 | 42,403 | 41,315
Maintenance | 20,255 | 14,218 | 13,392
Property and other taxes | 27,091 | 24,046 | 22,894
ASUS construction | 54,544 | 57,912 | 53,171
Gain on sale of assets |  | (100) | (75)
Operating Income | 184,490 | 196,524 | 126,644
Interest expense | (44,510) | (36,708) | (24,710)
Interest income | 7,776 | 7,423 | 2,352
(Gain) loss on investments held in a trust | 5,293 | 5,008 | (5,177)
Income tax benefit | 32,109 | 43,313 | 24,261
Other segment item, income (expense) | 1,919 | (151) | 5,044
Net Income | 122,859 | 128,783 | 79,892
Capital additions | 231,960 | 188,540 | 166,240
Reportable Legal Entities | Water | GSWC |  |  |
Details of reportable segment |  |  |
Operating revenues | 417,410 | 433,473 | 340,602
Supply costs | 111,823 | 120,382 | 98,228
Other operation | 28,349 | 29,064 | 28,117
Administrative and general | 64,510 | 59,313 | 58,358
Depreciation and amortization expense | 37,187 | 35,886 | 34,805
Maintenance | 9,788 | 9,906 | 9,559
Property and other taxes | 22,233 | 19,845 | 19,080
ASUS construction | 0 | 0 | 0
Gain on sale of assets |  | (100) | 0
Operating Income | 143,520 | 159,177 | 92,455
Interest expense | (38,532) | (31,283) | (22,742)
Interest income | 6,018 | 5,557 | 1,083
(Gain) loss on investments held in a trust | 5,293 | 5,008 | (5,177)
Income tax benefit | 22,869 | 35,689 | 16,346
Other segment item, income (expense) | 1,033 | (62) | 4,497
Net Income | 94,463 | 102,708 | 53,770
Capital additions | 197,355 | 160,939 | 146,730
Reportable Legal Entities | Electric | BVES |  |  |
Details of reportable segment |  |  |
Operating revenues | 51,645 | 41,832 | 39,986
Supply costs | 11,357 | 11,554 | 11,682
Other operation | 3,424 | 4,057 | 3,311
Administrative and general | 13,241 | 8,745 | 7,901
Depreciation and amortization expense | 3,160 | 3,256 | 2,792
Maintenance | 5,901 | 924 | 723
Property and other taxes | 2,399 | 2,100 | 1,837
ASUS construction | 0 | 0 | 0
Gain on sale of assets |  | 0 | 0
Operating Income | 12,163 | 11,196 | 11,740
Interest expense | (3,812) | (3,298) | (1,225)
Interest income | 976 | 1,060 | 394
(Gain) loss on investments held in a trust | 0 | 0 | 0
Income tax benefit | 2,541 | 1,515 | 2,439
Other segment item, income (expense) | 968 | 36 | 406
Net Income | 7,754 | 7,479 | 8,876
Capital additions | 29,980 | 25,372 | 18,069
Reportable Legal Entities | Contracted services: | American States Utility Services |  |  |
Details of reportable segment |  |  |
Operating revenues | 126,404 | 120,394 | 110,940
Supply costs | 0 | 0 | 0
Other operation | 9,545 | 7,150 | 6,667
Administrative and general | 23,183 | 20,431 | 19,923
Depreciation and amortization expense | 3,300 | 3,261 | 3,718
Maintenance | 4,566 | 3,388 | 3,110
Property and other taxes | 2,459 | 2,101 | 1,977
ASUS construction | 54,544 | 57,912 | 53,171
Gain on sale of assets |  | 0 | (75)
Operating Income | 28,807 | 26,151 | 22,449
Interest expense | (2,166) | (2,127) | (743)
Interest income | 782 | 806 | 875
(Gain) loss on investments held in a trust | 0 | 0 | 0
Income tax benefit | 6,699 | 6,109 | 5,476
Other segment item, income (expense) | (82) | (125) | 141
Net Income | 20,642 | 18,596 | 17,246
Capital additions | 4,625 | 2,229 | 1,441
Intersegment Eliminations | AWR |  |  |
Details of reportable segment |  |  |
Operating revenues | 0 | 0 | 0
Supply costs | 0 | 0 | 0
Other operation | 0 | 0 | 0
Administrative and general | 7 | (216) | 8
Depreciation and amortization expense | 0 | 0 | 0
Maintenance | 0 | 0 | 0
Property and other taxes | 0 | 0 | 0
ASUS construction | 0 | 0 | 0
Gain on sale of assets |  | 0 | 0
Operating Income | (7) | 216 | (8)
Interest expense | (5,872) | (6,054) | (2,317)
Interest income | 98 | (7) | (26)
(Gain) loss on investments held in a trust | 0 | 0 | 0
Income tax benefit | (1,936) | (1,714) | (597)
Other segment item, income (expense) | 254 | 269 | 258
Net Income | (3,591) | (3,862) | (1,496)
Capital additions | $ 0 | $ 0 | $ 0

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