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Nature of the business, Assets acquired (Details)
$ in Thousands
6 Months Ended
Aug. 02, 2019
USD ($)
MW
Corporation
May 24, 2019
USD ($)
MW
May 09, 2019
USD ($)
MW
Jan. 29, 2019
USD ($)
Dec. 14, 2018
USD ($)
MW
Dec. 11, 2018
USD ($)
kV
Feb. 28, 2018
USD ($)
MW
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 28, 2018
USD ($)
Oct. 10, 2018
USD ($)
Nature of the business [Abstract]                      
Investments carried under the equity method               $ 135,496 $ 53,419    
Befesa Agua Tenes, S.L.U. [Member]                      
Nature of the business [Abstract]                      
Ownership interest       51.00%              
Equity value of agreed price       $ 24,500              
Consideration payment advanced       $ 19,900              
Interest rate       12.00%              
Monterrey [Member] | Subsequent Events [Member]                      
Nature of the business [Abstract]                      
Gross capacity | MW 142                    
Acquisition purchase price $ 42,000                    
Ownership percentage acquired 30.00%                    
Installed capacity | MW 130                    
Battery capacity | MW 12                    
Period of PPA 20 years                    
Number of international corporations | Corporation 2                    
Ownership percentage to be acquired under ROFO agreement 70.00%                    
Amherst Island [Member]                      
Nature of the business [Abstract]                      
Gross capacity | MW   75                  
Installed capacity | MW     75                
Investments carried under the equity method   $ 4,900 $ 4,900                
Chile TL3 [Member]                      
Nature of the business [Abstract]                      
Gross capacity | kV           66          
Acquisition purchase price           $ 6,000          
Ownership interest               100.00%      
ATN [Member]                      
Nature of the business [Abstract]                      
Acquisition purchase price                   $ 16,000  
Ownership interest [1]               100.00%      
Melowind [Member]                      
Nature of the business [Abstract]                      
Percentage interest acquired         100.00%            
Gross capacity | MW         50            
Acquisition purchase price         $ 45,000            
Ownership interest               100.00%      
Mini- Hydro [Member]                      
Nature of the business [Abstract]                      
Percentage interest acquired             100.00%        
Gross capacity | MW             4        
Acquisition purchase price             $ 9,000        
Ownership interest               100.00%      
PTS [Member]                      
Nature of the business [Abstract]                      
Percentage interest acquired                     5.00%
Acquisition purchase price                     $ 7,000
[1] Including the acquisition of ATN expansion 1.