Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Project Assets (Details)

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Summary of Significant Accounting Policies - Project Assets (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accounting Policies [Abstract]      
Interest costs capitalized $ 2,104,206 $ 442,699 $ 252,113
Proceeds from Government Grants 6,023,767 6,695,711  
Deferred grant income 7,590,730 6,024,099  
Rebates from utility company $ 1,287,000 $ 0