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Maui windstorm and wildfires - Schedule of Utilities Charged (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Hawaiian Electric Company, Inc. and Subsidiaries        
Public Utilities, General Disclosures [Line Items]        
Accretion expense $ 18,000   $ 18,000  
Natural Disasters and Other Casualty Events | Legal expenses        
Public Utilities, General Disclosures [Line Items]        
Total Maui windstorm and wildfires related expenses 3,325 $ 5,888 5,232 $ 14,738
Natural Disasters and Other Casualty Events | Other expense        
Public Utilities, General Disclosures [Line Items]        
Total Maui windstorm and wildfires related expenses 1,270 6,740 1,378 14,823
Natural Disasters and Other Casualty Events | Maui Windstorm and Wildfires        
Public Utilities, General Disclosures [Line Items]        
Total Maui windstorm and wildfires related expenses 4,595 12,628 6,610 29,561
Insurance recoveries (7,842)   (9,174)  
Insurance recoveries   2,418   (4,304)
Settlement remeasurement (153,870)   (153,870)  
Accretion expense 17,714   17,714  
Deferral treatment approved by the PUC   (9,889)   (15,572)
Total Maui windstorm and wildfires related items, net (139,403) 5,157 (138,720) 9,685
Adjustment of costs no longer probable     8,500  
Natural Disasters and Other Casualty Events | Hawaiian Electric Company, Inc. and Subsidiaries | Legal expenses        
Public Utilities, General Disclosures [Line Items]        
Total Maui windstorm and wildfires related expenses 1,109 4,304 2,564 8,153
Natural Disasters and Other Casualty Events | Hawaiian Electric Company, Inc. and Subsidiaries | Other expense        
Public Utilities, General Disclosures [Line Items]        
Total Maui windstorm and wildfires related expenses 1,116 6,452 1,116 13,899
Natural Disasters and Other Casualty Events | Hawaiian Electric Company, Inc. and Subsidiaries | Maui Windstorm and Wildfires        
Public Utilities, General Disclosures [Line Items]        
Total Maui windstorm and wildfires related expenses 2,225 10,756 3,680 22,052
Insurance recoveries (7,870)   (8,831)  
Insurance recoveries   3,620   556
Settlement remeasurement (153,870)   (153,870)  
Accretion expense 17,714   17,714  
Deferral treatment approved by the PUC   (9,889)   (15,572)
Total Maui windstorm and wildfires related items, net $ (141,801) 4,487 $ (141,307) 7,036
Adjustments amount   6,600   6,600
Deferred to a regulatory asset   $ 4,000   $ 4,000