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Property, plant and equipment - Schedule of Plant, Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment [Line Items]    
Cost $ 14,003,548 $ 12,630,666
Accumulated depreciation 2,058,663 1,588,220
Net book value 11,944,885 11,042,446
Land    
Property, Plant and Equipment [Line Items]    
Cost 113,153 114,821
Accumulated depreciation 0 0
Net book value 113,153 114,821
Equipment    
Property, Plant and Equipment [Line Items]    
Cost 111,707 101,971
Accumulated depreciation 50,904 56,464
Net book value 60,803 45,507
Generation    
Property, Plant and Equipment [Line Items]    
Cost 4,119,514 4,187,197
Accumulated depreciation 1,016,784 751,219
Net book value 3,102,730 3,435,978
Generation | Construction in progress    
Property, Plant and Equipment [Line Items]    
Cost 196,287 148,302
Accumulated depreciation 0 0
Net book value 196,287 148,302
Utility plant    
Property, Plant and Equipment [Line Items]    
Cost 8,640,224 7,468,236
Accumulated depreciation 990,975 780,537
Net book value 7,649,249 6,687,699
Distribution and transmission | Construction in progress    
Property, Plant and Equipment [Line Items]    
Cost 822,663 610,139
Accumulated depreciation 0 0
Net book value $ 822,663 $ 610,139