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Subsequent event
 9 Months Ended
Sep. 30, 2025
Subsequent Events [Abstract]  
Subsequent event Subsequent event
Cumulative preferred stock redemption. On October 15, 2025, the Utilities redeemed all of their issued and outstanding cumulative preferred stock for a total of $35.3 million. The cumulative preferred stock of each series was redeemed with its respective premiums, if applicable. Dividends on the cumulative preferred stock ceased to accrue on October 15, 2025. Upon redemption, all rights of the preferred stock holders ceased to exist, except for the right to payment of the redemption price. The loss on redemption of cumulative preferred stock was $1.8 million, which was recorded to additional paid-in capital.
September 30, 2025Voluntary
liquidation price		Redemption
price
Series  
C, D, E, H, J and K (Hawaiian Electric)$20 $21 
I (Hawaiian Electric)20 20 
G (Hawaii Electric Light)100 100 
H (Maui Electric)100 100