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Business and asset acquisitions (Details)
$ in Thousands, $ in Thousands
 1 Months Ended 5 Months Ended 6 Months Ended 12 Months Ended
Apr. 30, 2021
USD ($)
MWac
Jan. 31, 2021
USD ($)
MWac
windProject
Oct. 31, 2020
USD ($)
Nov. 30, 2019
windProject
Jun. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
facility
Jun. 30, 2021
CLP ($)
facility
Dec. 31, 2019
windProject
MWac
Dec. 31, 2020
USD ($)
ESSAL                  
Net assets acquired, net of cash and cash equivalents                  
Non-controlling interest (percent)   30.00%              
Mid-west Wind Development Project                  
Business Acquisition [Line Items]                  
Number of wind projects | windProject               3  
Wind power capacity (megawatt AC) | MWac               600  
Tax equity funding         $ 530,880 $ 530,880      
Total purchase price           97,004      
Existing loans treated as a reduction of consideration incurred           789,923      
Net assets acquired, net of cash and cash equivalents                  
Working capital         (28,630) (28,630)      
Property, plant and equipment         1,136,390 1,136,390      
Long-term debt         (789,804) (789,804)      
Asset retirement obligation         (27,053) (27,053)      
Deferred tax liability         (2,969) (2,969)      
Other liabilities         (104,129) (104,129)      
Non-controlling interest         (29,141) (29,141)      
Total net assets acquired         154,664 154,664      
Cash and cash equivalents acquired         15,860 15,860      
Total net assets acquired, net of cash and cash equivalents         138,804 $ 138,804      
Missouri Wind Projects                  
Business Acquisition [Line Items]                  
Number of wind projects | windProject       2          
North Fork Ridge Wind Project                  
Business Acquisition [Line Items]                  
Number of wind projects | facility           3 3    
Tax equity funding                 $ 29,446
Altavista Solar Facility                  
Business Acquisition [Line Items]                  
Total purchase price $ 6,735                
Existing loans treated as a reduction of consideration incurred 122,024                
Net assets acquired, net of cash and cash equivalents                  
Working capital 870                
Property, plant and equipment 138,343                
Long-term debt (122,024)                
Asset retirement obligation (3,332)                
Deferred tax liability (421)                
Total net assets acquired 13,436                
Cash and cash equivalents acquired 33                
Total net assets acquired, net of cash and cash equivalents $ 13,403                
Equity interest (percent) 50.00%                
Solar power capacity (megawatt ac) | MWac 80                
Ownership interest acquired (percent) 50.00%                
Maverick Creek and Sugar Creek Wind Facilities                  
Business Acquisition [Line Items]                  
Number of wind projects | windProject   2              
Total purchase price   $ 43,797              
Existing loans treated as a reduction of consideration incurred   87,035              
Net assets acquired, net of cash and cash equivalents                  
Working capital   (15,557)              
Property, plant and equipment   1,068,708              
Long-term debt   (855,409)              
Asset retirement obligation   (23,402)              
Deferred tax liability   (6,431)              
Derivative instruments   7,575              
Total net assets acquired   175,484              
Cash and cash equivalents acquired   4,241              
Total net assets acquired, net of cash and cash equivalents   $ 171,243              
Equity interest (percent)   50.00%              
Ownership interest acquired (percent)   50.00%              
Consideration payable         18,641 $ 18,641      
Maverick Creek Wind Facility                  
Business Acquisition [Line Items]                  
Wind power capacity (megawatt AC) | MWac   492              
Existing loans treated as a reduction of consideration incurred         570,580        
Sugar Creek Wind Facility                  
Business Acquisition [Line Items]                  
Wind power capacity (megawatt AC) | MWac   202              
Tax equity funding         73,957 73,957      
Existing loans treated as a reduction of consideration incurred         $ 284,829        
ESSAL                  
Business Acquisition [Line Items]                  
Total purchase price     $ 162,086            
Net assets acquired, net of cash and cash equivalents                  
Ownership interest acquired (percent)     94.00%            
Increase in accruals and long-term debt           3,183 $ 2,534,109    
Increase in goodwill           $ 3,183 $ 2,534,109    
Ownership interest sold (percent)   32.00%              
Ownership interest after transaction (percent)   64.00%              
ESSAL | Third Party                  
Net assets acquired, net of cash and cash equivalents                  
Ownership interest sold   $ 51,750