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Property, plant and equipment - Schedule of Plant, Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]    
Cost $ 14,900,781 $ 14,003,548
Accumulated depreciation 2,383,331 2,058,663
Net book value 12,517,450 11,944,885
Land    
Property, Plant and Equipment [Line Items]    
Cost 133,483 113,153
Accumulated depreciation 0 0
Net book value 133,483 113,153
Equipment    
Property, Plant and Equipment [Line Items]    
Cost 122,929 111,707
Accumulated depreciation 53,181 50,904
Net book value 69,748 60,803
Generation    
Property, Plant and Equipment [Line Items]    
Cost 4,200,559 4,119,514
Accumulated depreciation 1,139,137 1,016,784
Net book value 3,061,422 3,102,730
Generation | Construction-in-progress    
Property, Plant and Equipment [Line Items]    
Cost 378,043 196,287
Accumulated depreciation 0 0
Net book value 378,043 196,287
Utility plant    
Property, Plant and Equipment [Line Items]    
Cost 9,332,092 8,640,224
Accumulated depreciation 1,191,013 990,975
Net book value 8,141,079 7,649,249
Distribution and transmission | Construction-in-progress    
Property, Plant and Equipment [Line Items]    
Cost 733,675 822,663
Accumulated depreciation 0 0
Net book value $ 733,675 $ 822,663