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Business Segments - Schedule by Business Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
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