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Revenues - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disaggregation of Revenue [Line Items]    
Total operating revenues $ 148,013 $ 135,251
GOLDEN STATE WATER COMPANY    
Disaggregation of Revenue [Line Items]    
Total operating revenues 102,003 90,265
Water: | GOLDEN STATE WATER COMPANY    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer, excluding assessed tax 101,747 85,790
Total operating revenues 102,003 90,265
Electric: | BVES    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer, excluding assessed tax 13,776 12,747
Total operating revenues 15,002 12,205
Contracted services: | ASUS    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer, excluding assessed tax 31,008 32,781
Tariff-based revenues | Water: | GOLDEN STATE WATER COMPANY    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer, excluding assessed tax 100,331 84,661
Tariff-based revenues | Electric: | BVES    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer, excluding assessed tax 13,733 12,673
CPUC-approved surcharges (cost-recovery activities) | Water: | GOLDEN STATE WATER COMPANY    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer, excluding assessed tax 805 547
CPUC-approved surcharges (cost-recovery activities) | Electric: | BVES    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer, excluding assessed tax 43 74
Other | Water: | GOLDEN STATE WATER COMPANY    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer, excluding assessed tax 611 582
Alternative revenues program | Water: | GOLDEN STATE WATER COMPANY    
Disaggregation of Revenue [Line Items]    
Alternative revenue programs, net 256 4,475
Alternative revenues program | Electric: | BVES    
Disaggregation of Revenue [Line Items]    
Alternative revenue programs, net 1,226 (542)
Water | Contracted services: | ASUS    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer, excluding assessed tax 16,612 21,567
Wastewater | Contracted services: | ASUS    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer, excluding assessed tax $ 14,396 $ 11,214