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Property, plant and equipment - Schedule of Plant, Property and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Property, Plant and Equipment [Line Items]    
Cost $ 11,176,299 $ 10,463,033
Accumulated depreciation 1,726,204 1,336,260
Net book value 9,450,095 9,126,773
Land    
Property, Plant and Equipment [Line Items]    
Cost 117,700 118,295
Accumulated depreciation 0 0
Net book value 117,700 118,295
Utility plant    
Property, Plant and Equipment [Line Items]    
Cost 10,366,245 9,330,075
Accumulated depreciation 1,596,778 1,204,155
Net book value 8,769,467 8,125,920
Utility plant | Construction-in-progress    
Property, Plant and Equipment [Line Items]    
Cost 426,170 736,173
Accumulated depreciation 0 0
Net book value 426,170 736,173
Hydro: generation facilities and other    
Property, Plant and Equipment [Line Items]    
Cost 258,631 272,498
Accumulated depreciation 129,426 132,105
Net book value 129,205 140,393
Hydro: generation facilities and other | Construction-in-progress    
Property, Plant and Equipment [Line Items]    
Cost 7,553 5,992
Accumulated depreciation 0 0
Net book value $ 7,553 $ 5,992