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Bank Debt (Details)
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jul. 01, 2020
USD ($)
Bank debt      
Line of credit facility, current borrowing capacity $ 200,000,000    
Bear Valley Electric Service, Inc.      
Bank debt      
Maximum borrowing capacity 35,000,000    
Incremental expansion of borrowing capacity 15,000,000   $ 35,000,000
Notes Payable $ 31,000,000    
GSWC      
Bank debt      
Short-term Debt, Terms 24    
Long-term Debt [Member]      
Bank debt      
Balance Outstanding at December 31, $ 205,500,000 $ 134,200,000  
Short-term borrowing activities (excluding letters of credit)      
Balance Outstanding at December 31, 205,500,000 134,200,000  
Short-term borrowing (excluding letters of credit)      
Bank debt      
Average Amount Outstanding $ 165,167,000 $ 162,995,000  
Weighted Average Annual Interest Rate (as a percent) 1.05% 1.47%  
Maximum Amount Outstanding $ 205,500,000 $ 249,200,000  
Short-term borrowing activities (excluding letters of credit)      
Weighted Average Annual Interest Rate (as a percent) 1.05% 1.47%  
Average Amount Outstanding $ 165,167,000 $ 162,995,000  
Maximum Amount Outstanding 205,500,000 249,200,000  
Average amount outstanding $ 165,167,000 $ 162,995,000  
Short-term borrowing (excluding letters of credit) | Maximum      
Bank debt      
Interest Rate at the end of the period (as a percent) 1.61% 1.90%  
Short-term borrowing activities (excluding letters of credit)      
Interest Rate at the end of the period (as a percent) 1.61% 1.90%  
Short-term borrowing (excluding letters of credit) | Minimum      
Bank debt      
Interest Rate at the end of the period (as a percent) 0.78% 1.19%  
Short-term borrowing activities (excluding letters of credit)      
Interest Rate at the end of the period (as a percent) 0.78% 1.19%  
Syndicated revolving credit facility      
Bank debt      
Variable rate basis LIBOR    
Syndicated revolving credit facility | Bear Valley Electric Service, Inc.      
Bank debt      
Interest coverage ratio 58.6    
Total funded debt ratio 0.30    
Short-term borrowing activities (excluding letters of credit)      
Interest coverage ratio 58.6    
Total funded debt ratio 0.30    
Syndicated revolving credit facility | Maximum      
Bank debt      
Total funded debt ratio 0.65    
Short-term borrowing activities (excluding letters of credit)      
Total funded debt ratio 0.65    
Syndicated revolving credit facility | Minimum      
Bank debt      
Interest coverage ratio 3.25    
Short-term borrowing activities (excluding letters of credit)      
Interest coverage ratio 3.25    
Syndicated revolving credit facility | Minimum | Bear Valley Electric Service, Inc.      
Bank debt      
Interest coverage ratio 4.5    
Short-term borrowing activities (excluding letters of credit)      
Interest coverage ratio 4.5    
AWR      
Bank debt      
Line of credit facility, current borrowing capacity $ 200,000,000    
AWR | Long-term Debt [Member]      
Bank debt      
Balance Outstanding at December 31, 174,500,000 $ 114,000,000  
Short-term borrowing activities (excluding letters of credit)      
Balance Outstanding at December 31, $ 174,500,000 $ 114,000,000  
AWR | Short-term borrowing (excluding letters of credit)      
Bank debt      
Interest Rate at the end of the period (as a percent) 0.78% 1.19%  
Average Amount Outstanding $ 139,926,000 $ 160,495,000  
Weighted Average Annual Interest Rate (as a percent) 0.91% 1.47%  
Maximum Amount Outstanding $ 174,500,000 $ 249,000,000  
Short-term borrowing activities (excluding letters of credit)      
Weighted Average Annual Interest Rate (as a percent) 0.91% 1.47%  
Average Amount Outstanding $ 139,926,000 $ 160,495,000  
Maximum Amount Outstanding $ 174,500,000 $ 249,000,000  
Interest Rate at the end of the period (as a percent) 0.78% 1.19%  
Average amount outstanding $ 139,926,000 $ 160,495,000  
AWR | Syndicated revolving credit facility      
Bank debt      
Interest coverage ratio 8.21    
Total funded debt ratio 0.47    
Short-term borrowing activities (excluding letters of credit)      
Interest coverage ratio 8.21    
Total funded debt ratio 0.47    
AWR | Syndicated revolving credit facility | Bear Valley Electric Service, Inc.      
Bank debt      
Total funded debt ratio 0.65    
Short-term borrowing activities (excluding letters of credit)      
Total funded debt ratio 0.65    
AWR | Syndicated revolving credit facility | Maximum      
Bank debt      
Total funded debt ratio 1.00    
Short-term borrowing activities (excluding letters of credit)      
Total funded debt ratio 1.00    
AWR | Syndicated revolving credit facility | Minimum      
Bank debt      
Interest coverage ratio 3.25    
Total funded debt ratio 0.65    
Short-term borrowing activities (excluding letters of credit)      
Interest coverage ratio 3.25    
Total funded debt ratio 0.65    
AWR | Syndicated revolving credit facility | Letters of credit      
Bank debt      
Maximum borrowing capacity $ 25,000,000    
Letter of credit, amount $ 455,000    
Letter of credit fee (as a percent) 0.65%