Maui windstorm and wildfires - Schedule of Utilities Charged (Details) - Natural Disasters and Other Casualty Events - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Maui Windstorm and Wildfires
Public Utilities, General Disclosures [Line Items]
Total Maui windstorm and wildfires related expenses	$ 2,015	$ 16,933
Insurance recoveries	(1,332)	(6,722)
Deferral treatment approved by the PUC	0	(5,683)
Total Maui windstorm and wildfires related expenses, net of insurance recoveries and approved deferral treatment	683	4,528
Legal expenses
Public Utilities, General Disclosures [Line Items]
Total Maui windstorm and wildfires related expenses	1,907	8,850
Other expense
Public Utilities, General Disclosures [Line Items]
Total Maui windstorm and wildfires related expenses	108	8,083
Hawaiian Electric Company, Inc. and Subsidiaries | Maui Windstorm and Wildfires
Public Utilities, General Disclosures [Line Items]
Total Maui windstorm and wildfires related expenses	1,455	11,296
Insurance recoveries	(961)	(3,064)
Deferral treatment approved by the PUC	0	(5,683)
Total Maui windstorm and wildfires related expenses, net of insurance recoveries and approved deferral treatment	494	2,549
Hawaiian Electric Company, Inc. and Subsidiaries | Legal expenses
Public Utilities, General Disclosures [Line Items]
Total Maui windstorm and wildfires related expenses	1,455	3,849
Hawaiian Electric Company, Inc. and Subsidiaries | Other expense
Public Utilities, General Disclosures [Line Items]
Total Maui windstorm and wildfires related expenses	$ 0	$ 7,447