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LOANS AND BORROWINGS - Total working capital and project financing credit (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Loans and Borrowings    
Outstanding loans (net of debt issuance costs) ¥ 1,230,756 ¥ 397,213
Outstanding loans (net of debt issuance costs) 11,489,380 8,768,997
Debt issuance costs 226,085 ¥ 273,822
Credit facilities    
Loans and Borrowings    
Total working capital and project financing credit facilities 23,421,419  
Unused amount 10,505,516  
Loan drew down 12,915,903  
Credit facilities | Short-term borrowing    
Loans and Borrowings    
Outstanding loans (net of debt issuance costs) 1,229,377  
Debt issuance costs 1,211  
Credit facilities | Long-term borrowing    
Loans and Borrowings    
Outstanding loans (net of debt issuance costs) 11,489,380  
Debt issuance costs ¥ 195,935  
Minimum    
Loans and Borrowings    
Terms of secured loan agreements with various financial institutions for project development and working capital purpose 1 year  
Maximum    
Loans and Borrowings    
Terms of secured loan agreements with various financial institutions for project development and working capital purpose 15 years