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Business acquisitions, development projects and disposition transactions - Schedule of Preliminary Allocation Of The Acquisition Prices Of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Jan. 01, 2022
Dec. 31, 2021
Apr. 30, 2021
Jan. 31, 2021
Dec. 31, 2020
Business Acquisition [Line Items]            
Goodwill (note 6) $ 1,320,579   $ 1,201,244     $ 1,208,390
New York Water Company, Inc            
Business Acquisition [Line Items]            
Working capital   $ 4,820        
Property, plant and equipment   499,252        
Goodwill (note 6)   116,254        
Regulatory assets   65,621        
Other assets   4,507        
Pension and other post-employment benefits   (13,402)        
Regulatory liabilities   (59,727)        
Other liabilities   (8,028)        
Total net assets acquired   609,297        
Cash and cash equivalents   49        
Net assets acquired, net of cash and cash equivalents   $ 609,248        
Mid-West Wind Facilities            
Business Acquisition [Line Items]            
Working capital     (28,630)      
Property, plant and equipment     1,141,884      
Long-term debt     (789,804)      
Deferred tax liability     (4,566)      
Asset retirement obligation     (27,053)      
Other liabilities     (104,129)      
Non-controlling interest (tax equity investors)     (29,141)      
Total net assets acquired     158,561      
Cash and cash equivalents     15,860      
Net assets acquired, net of cash and cash equivalents     $ 142,701      
Altavista Solar Facility            
Business Acquisition [Line Items]            
Working capital       $ 870    
Property, plant and equipment       138,343    
Long-term debt       (122,024)    
Deferred tax liability       (421)    
Asset retirement obligation       (3,332)    
Total net assets acquired       13,436    
Cash and cash equivalents       33    
Net assets acquired, net of cash and cash equivalents       $ 13,403    
Maverick Creek and Sugar Creek Wind Facilities            
Business Acquisition [Line Items]            
Working capital         $ (15,557)  
Property, plant and equipment         1,062,613  
Long-term debt         (855,409)  
Deferred tax liability         (337)  
Asset retirement obligation         (23,402)  
Derivative instruments         7,575  
Total net assets acquired         175,483  
Cash and cash equivalents         4,241  
Net assets acquired, net of cash and cash equivalents         $ 171,242