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Electric utility segment - Commitments and contingencies (Details)
$ in Thousands
 1 Months Ended 6 Months Ended 12 Months Ended
Jun. 07, 2024
USD ($)
MW
May 31, 2024
USD ($)
MW
Mar. 28, 2024
USD ($)
MW
Apr. 30, 2024
USD ($)
Feb. 29, 2024
Jul. 31, 2018
MW
May 31, 2012
MW
Jun. 30, 2024
USD ($)
agreement
MW
Dec. 31, 2022
USD ($)
Dec. 31, 2019
agreement
Dec. 31, 2023
USD ($)
Long-term Purchase Commitment [Line Items]                      
Finance lease liabilities               $ 443,366     $ 339,040
Operating lease right-of-use assets               $ 86,819     94,905
Environmental loss contingency, statement of financial position, not disclosed               reserve account balance      
Purchase obligation                     1,700,000
Maui Electric                      
Long-term Purchase Commitment [Line Items]                      
Additional accrued investigation and estimated cleanup costs               $ 2,500      
Hawaiian Electric, Parent | PCB Contamination                      
Long-term Purchase Commitment [Line Items]                      
Valuation allowances and reserves               9,500      
Hawaiian Electric Company, Inc. and Subsidiaries                      
Long-term Purchase Commitment [Line Items]                      
Operating lease right-of-use assets               64,740     $ 71,877
Notice period, pre-cursor to citizen's suit         60 days            
Number of power purchase agreements (PPAs) (in agreements) | agreement                   7  
Hu Honua Bioenergy, LLC                      
Long-term Purchase Commitment [Line Items]                      
Minimum power volume required (in megawatts) | MW             21.5        
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          
James Campbell Company | Hawaiian Electric, Parent | Kapolei Petroleum Contamination                      
Long-term Purchase Commitment [Line Items]                      
Environmental remediation expense       $ 1,400         $ 800    
AES Hawaii | Hawaiian Electric Company, Inc. and Subsidiaries                      
Long-term Purchase Commitment [Line Items]                      
Minimum power volume required (in megawatts) | MW 42 60 12.5                
Total contracted PV capacity (in megawatts) | MW 168 240 50                
Annual payment $ 11,500 $ 13,200 $ 3,200                
Finance lease liabilities               107,400      
Operating lease right-of-use assets               $ 107,400      
Stage 1 And 2 Renewable PPAs | Hawaiian Electric Company, Inc. and Subsidiaries                      
Long-term Purchase Commitment [Line Items]                      
Minimum power volume required (in megawatts) | MW               114.5      
Total contracted PV capacity (in megawatts) | MW               458      
Number of power purchase agreements (PPAs) (in agreements) | agreement               3