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Maui windstorm and wildfires - Utilities Charged (Details) - Natural Disasters and Other Casualty Events - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Maui Windstorm and Wildfires        
Public Utilities, General Disclosures [Line Items]        
Total Maui windstorm and wildfires related expenses $ 12,628 $ 1,747,843 $ 29,561 $ 1,778,070
Insurance recoveries 2,418 (18,875) (4,304) (31,452)
Deferral treatment approved by the PUC (9,889) (7,656) (15,572) (15,554)
Total Maui windstorm and wildfires related expenses, net of insurance recoveries and approved deferral treatment 5,157 1,721,312 9,685 1,731,064
Legal expenses        
Public Utilities, General Disclosures [Line Items]        
Total Maui windstorm and wildfires related expenses 5,888 24,181 14,738 39,125
Wildfire tort-related claims        
Public Utilities, General Disclosures [Line Items]        
Total Maui windstorm and wildfires related expenses   1,712,000   1,712,000
Other expense        
Public Utilities, General Disclosures [Line Items]        
Total Maui windstorm and wildfires related expenses 6,740 11,662 14,823 26,945
Hawaiian Electric Company, Inc. and Subsidiaries | Maui Windstorm and Wildfires        
Public Utilities, General Disclosures [Line Items]        
Total Maui windstorm and wildfires related expenses 10,756 1,738,875 22,052 1,763,442
Insurance recoveries 3,620 (16,379) 556 (26,348)
Deferral treatment approved by the PUC (9,889) (7,656) (15,572) (15,554)
Total Maui windstorm and wildfires related expenses, net of insurance recoveries and approved deferral treatment 4,487 1,714,840 7,036 1,721,540
Adjustments amount 6,600   6,600  
Deferred to a regulatory asset 4,000   4,000  
Income related to discontinued operations   500   300
Hawaiian Electric Company, Inc. and Subsidiaries | Legal expenses        
Public Utilities, General Disclosures [Line Items]        
Total Maui windstorm and wildfires related expenses 4,304 17,613 8,153 28,348
Hawaiian Electric Company, Inc. and Subsidiaries | Wildfire tort-related claims        
Public Utilities, General Disclosures [Line Items]        
Total Maui windstorm and wildfires related expenses   1,712,000   1,712,000
Hawaiian Electric Company, Inc. and Subsidiaries | Other expense        
Public Utilities, General Disclosures [Line Items]        
Total Maui windstorm and wildfires related expenses $ 6,452 $ 9,262 $ 13,899 $ 23,094