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Electric utility segment - Commitments and contingencies (Details)
$ in Thousands
 1 Months Ended
Jul. 11, 2025
USD ($)
MW
Mar. 25, 2025
USD ($)
MW
Nov. 16, 2023
defendant
Jul. 31, 2018
MW
Sep. 30, 2025
USD ($)
agreement
MW
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
May 31, 2012
MW
Long-term Purchase Commitment [Line Items]                
Purchase obligation             $ 2,200,000  
Operating lease right-of-use assets         $ 58,197   66,553  
Maui Electric                
Long-term Purchase Commitment [Line Items]                
Additional accrued investigation and estimated cleanup costs         2,400      
Hawaiian Electric, Parent | PCB Contamination                
Long-term Purchase Commitment [Line Items]                
Valuation allowances and reserves         9,300      
Hawaiian Electric Company, Inc. and Subsidiaries                
Long-term Purchase Commitment [Line Items]                
Operating lease right-of-use assets         $ 57,179   $ 59,281  
Hu Honua Bioenergy, LLC                
Long-term Purchase Commitment [Line Items]                
Minimum power volume required (in megawatts) | MW               21.5
Number of defendants | defendant     3          
Molokai New Energy Partners                
Long-term Purchase Commitment [Line Items]                
Total contracted PV capacity (in megawatts) | MW       4.88        
Total contracted battery energy storage system capacity | MW       3        
Maximum power volume to be delivered (in megawatts) | MW       2.64        
Stage1 And2 Renewable P P | Hawaiian Electric Company, Inc. and Subsidiaries                
Long-term Purchase Commitment [Line Items]                
Minimum power volume required (in megawatts) | MW   30     301.5      
Total contracted PV capacity (in megawatts) | MW   120     1,771      
Annual payment   $ 11,900            
Operating lease right-of-use assets           $ 42,300    
Finance lease liabilities           $ 42,300    
Number of power purchase agreements (PPAs) (in agreements) | agreement         9      
Hoohana Solar | Hawaiian Electric Company, Inc. and Subsidiaries                
Long-term Purchase Commitment [Line Items]                
Minimum power volume required (in megawatts) | MW 52              
Total contracted PV capacity (in megawatts) | MW 208              
Annual payment $ 13,400              
Operating lease right-of-use assets         $ 51,300      
Finance lease liabilities         $ 51,300