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Nature of the business, Assets acquired (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 9 Months Ended
Aug. 17, 2020
USD ($)
Apr. 03, 2020
USD ($)
MW
Aug. 02, 2019
USD ($)
MW
May 24, 2019
USD ($)
MW
Jan. 29, 2019
USD ($)
Oct. 31, 2019
USD ($)
Sep. 30, 2020
USD ($)
Aug. 16, 2020
USD ($)
May 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
Oct. 22, 2019
USD ($)
Nature of the business [Abstract]                      
Investments carried under the equity method             $ 116,746     $ 139,925  
Solana [Member]                      
Nature of the business [Abstract]                      
Ownership interest             100.00%        
Befesa Agua Tenes, S.L.U. [Member]                      
Nature of the business [Abstract]                      
Percentage interest acquired                 51.00%    
Ownership interest         51.00%            
Consideration payment advanced         $ 19,900            
Interest rate         12.00%            
Payment received through cash sweep mechanism           $ 7,800          
Secured loan amount                 $ 4,500    
Borrowings outstanding                 $ 14,000    
Call price (in dollars per share) | $ / shares                 $ 1.00    
Monterrey [Member]                      
Nature of the business [Abstract]                      
Gross capacity | MW     142                
Investments carried under the equity method     $ 17,000                
Acquisition purchase price     $ 42,000                
Percentage interest acquired     30.00%                
Amherst Island [Member]                      
Nature of the business [Abstract]                      
Gross capacity | MW       75              
Investments carried under the equity method       $ 4,900              
ASI Operations LLC [Member]                      
Nature of the business [Abstract]                      
Investments carried under the equity method     $ 6,000                
Acquisition purchase price     $ 6,000                
Percentage interest acquired     100.00%                
ATN2 [Member]                      
Nature of the business [Abstract]                      
Acquisition purchase price                     $ 20,000
Atacama Desert [Member]                      
Nature of the business [Abstract]                      
Investments carried under the equity method   $ 4,000                  
Ownership percentage acquired   35.00%                  
Installed capacity | MW   55                  
Liberty Interactive Corporation [Member] | Solana [Member]                      
Nature of the business [Abstract]                      
Investments carried under the equity method $ 290,000                    
Acquisition purchase price               $ 272,000      
Period of annual net production of asset 4 years                    
Performance earn-out, period of highest annual net production of asset 5 years                    
Algonquin [Member] | Amherst Island [Member]                      
Nature of the business [Abstract]                      
Investments carried under the equity method       $ 92,300