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Electric utility segment - Unconsolidated Variable Interest Entities (Details) $ in Millions	Sep. 30, 2025 USD ($) entity agreement	Mar. 31, 2025
Power purchase agreement
Number of IPPs (in entities) \| entity	2
GLST1, LLC
Power purchase agreement
Membership interest		60.00%
Investment in unconsolidated affiliate \| $	$ 287.3
Hawaiian Electric Company
Power purchase agreement
Number of power purchase agreements (PPAs) (in agreements) \| agreement	4

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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