Segment financial information - Summary of Revenues and Expenses Classified As Held For Sale (Details) - Disposal Group, Held-for-Sale, Not Discontinued Operations - Pacific Current - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment financial information
Revenues	$ 3,910	$ 2,753	$ 9,459	$ 6,129
Expenses	5,018	3,654	9,365	11,918
Operating income (loss) attributed to Pacific Current’s solar/BESS and biomass facilities classified as held for sale	$ (1,108)	$ (901)	$ 94	$ (5,789)