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ALLOWANCE FOR DOUBTFUL ACCOUNTS (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Allowances for accounts receivable
      
Movement of allowances      
Beginning of the year $ 9,505,481 $ 7,956,036 $ 18,029,440
Allowances made (reversal) during the year 43,240,595 6,552,926 (10,082,718)
Accounts written-off against allowances (5,325,908) (5,053,538)  
Foreign exchange effect 162,049 50,057 9,314
Closing balance 47,582,217 9,505,481 7,956,036
Allowances for accounts receivable | Other
      
Movement of allowances      
Allowances made during the year 15,300,000    
Allowances for accounts receivable | Chaori Solar
      
Movement of allowances      
Allowances made during the year 18,700,000    
Allowances for advances to suppliers
      
Movement of allowances      
Beginning of the year 38,123,721 19,389,542 10,985,195
Allowances made (reversal) during the year 370,622 17,728,681 10,239,858
Accounts written-off against allowances     (2,205,848)
Foreign exchange effect 51,144 1,005,498 370,337
Closing balance $ 38,545,487 $ 38,123,721 $ 19,389,542