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BORROWINGS (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
item
Aug. 31, 2020
USD ($)
Jul. 31, 2020
USD ($)
Apr. 30, 2020
USD ($)
BANK BORROWINGS          
Subtotal for short-term borrowings $ 1,202,285,000 $ 933,120,000      
Long-term borrowings on project assets - current 198,794,000 286,173,000      
Long-term borrowings 446,090,000 $ 619,477,000      
Secured short-term borrowings 628,519,000        
Amount drawn of bank credit facilities granted 177,214,000        
Long-term borrowings, current 258,978,000        
Secured long-term borrowings, Current 198,794,000        
Secured long-term borrowings 351,431,000        
Future principal repayment of long-term borrowings on project assets - current 198,794,000        
Carrying value of property, plant and equipment that serve as collateral for short-term and long-term borrowings 224,893,000        
Carrying value of inventories that serve as collateral for short-term and long-term borrowings 243,124,000        
Carrying value of prepaid land use rights that serve as collateral for short-term and long-term borrowings 9,509,000        
Carrying value of restricted cash that serve as collateral for short-term and long-term borrowings 107,598,000        
Carrying value of accounts receivable that serve as collateral for short-term and long-term borrowings 15,882,000        
Carrying value of equity that serve as collateral for short-term and long-term borrowings 529,431,000        
Carrying value of project assets and solar power systems that serve as collateral for short-term and long-term borrowings 696,955,000        
Canadian Solar New Energy Holding Company Limited [Member]          
BANK BORROWINGS          
Line of Credit Facility, Maximum Borrowing Capacity         $ 30,000,000
Recurrent Energy, LLC          
BANK BORROWINGS          
Line of Credit Facility, Maximum Borrowing Capacity       $ 282,000,000  
Amount drawn of bank credit facilities granted 203,747,000        
Number of credit facilities | item   2      
Credit facility          
BANK BORROWINGS          
Line of Credit Facility, Maximum Borrowing Capacity 2,618,761,000        
Available amount of credit facilities 707,174,000        
Credit facility | Recurrent Energy, LLC          
BANK BORROWINGS          
Line of Credit Facility, Maximum Borrowing Capacity     $ 75,000,000,000    
Credit facility One | Recurrent Energy, LLC          
BANK BORROWINGS          
Line of Credit Facility, Maximum Borrowing Capacity   $ 123,708,000      
Credit facility Two | Recurrent Energy, LLC          
BANK BORROWINGS          
Line of Credit Facility, Maximum Borrowing Capacity   $ 60,000,000      
Working Capital Facility | Canadian Solar New Energy Holding Company Limited [Member]          
BANK BORROWINGS          
Line of Credit Facility, Maximum Borrowing Capacity     $ 50,000,000,000    
Non-binding bank credit facilities          
BANK BORROWINGS          
Line of Credit Facility, Maximum Borrowing Capacity 966,270,000        
Nonrecourse [Member]          
BANK BORROWINGS          
Amount drawn of bank credit facilities granted $ 433,628,000