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Business acquisitions and development projects - Acquisition of Luning Solar Facility (Details)
CAD in Thousands, $ in Thousands
Feb. 17, 2017
USD ($)
Feb. 15, 2017
USD ($)
MWac
Dec. 31, 2016
USD ($)
Feb. 15, 2017
CAD
Luning Solar Facility        
Business Acquisition [Line Items]        
Business combination, purchase price | $   $ 111    
Working capital       CAD 198
Property, plant and equipment       145,045
Asset retirement obligation       (714)
Non-controlling interest (tax equity)       (50,548)
Total net assets acquired       CAD 93,981
Luning Solar Facility        
Business Acquisition [Line Items]        
Solar power capacity (megawatt ac) | MWac   50    
Partnership | Tax Investor | Luning Solar Facility        
Business Acquisition [Line Items]        
Partnership agreement, funded amount | $ $ 31,212   $ 7,826