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Significant group concentrations of credit risk (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 26, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Major customers        
Percentage of workforce covered by collective bargaining arrangement   50.00%    
Cash insured   $ 2,000    
Restricted cash insured   10,000    
Cash and cash equivalents   750,535 $ 244,091 $ 43,728
Restricted cash   492,317 15,028  
Money market mutual funds        
Major customers        
Cash and cash equivalents   565,000    
Restricted cash   482,000    
Hawaiian Electric Company, Inc. and Subsidiaries        
Major customers        
Market rate adjustment percentage 11.40%      
Annual incentive percentage 4.00%      
Contract term 3 years      
General wage increase percentage 3.00%      
Incentive payment percentage 1.00%      
Cash insured   69,000    
Cash and cash equivalents   184,148 106,077 $ 39,242
Restricted cash   0 $ 2,000  
Hawaiian Electric Company, Inc. and Subsidiaries | Money market mutual funds        
Major customers        
Cash and cash equivalents   $ 116,000