Maui windstorm and wildfires - Utilities Charged (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Hawaiian Electric Company, Inc. and Subsidiaries
Public Utilities, General Disclosures [Line Items]
Insurance recoveries	$ (1,000)
Natural Disasters and Other Casualty Events | Maui Windstorm and Wildfires
Public Utilities, General Disclosures [Line Items]
Total Maui windstorm and wildfires related expenses	2,046,030	$ 127,112
Insurance recoveries	(94,699)	(104,580)
Deferral treatment approved by the PUC	(37,960)	(14,692)
Total Maui windstorm and wildfires related expenses, net of insurance recoveries and approved deferral treatment	1,913,371	7,840
Natural Disasters and Other Casualty Events | Legal expenses
Public Utilities, General Disclosures [Line Items]
Total Maui windstorm and wildfires related expenses	69,779	33,969
Natural Disasters and Other Casualty Events | Wildfire tort-related claims
Public Utilities, General Disclosures [Line Items]
Total Maui windstorm and wildfires related expenses	1,915,000	75,000
Natural Disasters and Other Casualty Events | Other expense
Public Utilities, General Disclosures [Line Items]
Total Maui windstorm and wildfires related expenses	61,251	18,143
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	2,018,827	114,808
Insurance recoveries	(85,781)	(98,613)
Deferral treatment approved by the PUC	(37,960)	(14,692)
Total Maui windstorm and wildfires related expenses, net of insurance recoveries and approved deferral treatment	1,895,086	1,503
Discontinued operation expenses	1,300	11,300
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	51,406	24,737
Natural Disasters and Other Casualty Events | Hawaiian Electric Company, Inc. and Subsidiaries | Wildfire tort-related claims
Public Utilities, General Disclosures [Line Items]
Total Maui windstorm and wildfires related expenses	1,915,000	75,000
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	$ 52,421	$ 15,071