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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Buildings
Dec. 31, 2012
Machinery
Minimum
Dec. 31, 2012
Machinery
Maximum
Dec. 31, 2012
Furniture, fixtures and equipment
Dec. 31, 2012
Motor vehicles
Project assets              
Project assets - Acquisition cost $ 275,423,447            
Project assets - Modules cost 30,721,957            
Project assets - Development cost 67,037,602            
Project assets - Others 25,964,018            
Total Project assets 399,147,024            
Current portion 180,436,619 37,133,068          
Non-current portion $ 218,710,405            
Property, plant and equipment              
Estimated useful lives     20 years 5 years 10 years 5 years 5 years