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Debt (Details) - USD ($) $ in Millions	Jun. 30, 2025	Apr. 14, 2025	Dec. 31, 2024	Apr. 30, 2024
4.911% WIFA Note, maturing April 2044 (“4.911% WIFA Note”) | Government Loan
Debt Instrument [Line Items]
Debt instrument, interest rate				4.911%
Northern Trust Loan Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Revolving line of credit, maximum borrowing capacity		$ 20.0	$ 15.0
Line of credit	$ 0.0		$ 0.0
Government Assistance, Loan | GW-Rincon Utility
Debt Instrument [Line Items]
Government assistance, amount				$ 2.4
Government assistance, outstanding balance	$ 1.6
Government Assistance, Forgiveable Loan | GW-Rincon Utility
Debt Instrument [Line Items]
Government assistance, amount				$ 0.7

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Contractual interest rate for funds borrowed, under the debt agreement.

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