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Property, plant and equipment - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Property, Plant, and Equipment Disclosure [Line Items]    
Contribution received $ 672 $ 238
Utility plant    
Property, Plant, and Equipment Disclosure [Line Items]    
Renewable generation assets related to facilities under capital lease and owned by consolidated VIE 2,146,852 1,961,720
Renewable generation assets related to facilities under capital lease and owned by consolidated VIE, accumulated depreciation 171,920 98,128
Regulated Services Group    
Property, Plant, and Equipment Disclosure [Line Items]    
Cost of distribution assets 3,351 3,270
Accumulated depreciation 2,970 2,455
Hydro: generation facilities and other    
Property, Plant, and Equipment Disclosure [Line Items]    
Renewable generation assets related to facilities under capital lease and owned by consolidated VIE 74,818 77,859
Renewable generation assets related to facilities under capital lease and owned by consolidated VIE, accumulated depreciation 38,692 40,386
Depreciation expense 974 461
Land    
Property, Plant, and Equipment Disclosure [Line Items]    
Cost of distribution assets 5,263 5,263
Construction-in-progress    
Property, Plant, and Equipment Disclosure [Line Items]    
Cost of distribution assets $ 43,319 $ 15,770