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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating activities:      
Net income (loss) $ (195,155,097) $ (90,903,374) $ 50,828,396
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:      
Depreciation and amortization 81,398,470 56,117,280 31,266,181
Loss on disposal of property, plant and equipment 1,991,098 1,223,163 194,243
(Gain) loss on change in fair value of derivatives 4,369,173 5,750,981 (1,656,928)
Investment loss 1,081,700   3,000,000
Equity in (loss) earnings of unconsolidated investees 1,969,306 41,163 (146,597)
Allowance for doubtful debts 43,611,217 23,156,857 3,046,100
Write-down of inventories 3,085,529 8,456,260 2,101,124
Provision for firm purchase commitment   10,610,410 1,562,002
Amortization of discount on debt 49,699 44,485 39,816
Share-based compensation 5,185,242 4,060,838 3,876,671
Changes in operating assets and liabilities:      
Inventories 3,960,749 (28,798,943) (103,637,355)
Accounts receivable (6,983,739) (103,748,565) (5,704,039)
Amount due from related parties 9,904,520 (18,135,684) (1,347,828)
Value added tax recoverable 2,303,949 28,508,062 (1,828,277)
Advances to suppliers (17,898,461) 13,458,006 2,227,991
Other non-current assets (24,406,669) (9,257,048) (5,826,029)
Accounts receivable, unbilled 46,425,858 (51,370,820)  
Project assets (300,679,763) (37,133,068)  
Prepaid expenses and other current assets (70,614,891) (2,969,210) (6,424,395)
Accounts payable 56,238,301 52,435,834 18,096,208
Short-term notes payable 99,114,001 118,154,508 (96,011,517)
Other payables 36,910,195 20,699,554 10,979,862
Advances from customers (46,127,125) 56,706,824 5,120,313
Amounts due to related parties 2,015,133 484,649 2,163,515
Accrued warranty costs 11,334,395 15,737,987 14,259,880
Provision for firm purchase commitment   (27,862,017)  
Loss contingency accruals   27,862,017  
Other current liabilities 59,188,516 (744,073) 18,875,491
Prepaid land use right (4,760,904) 229,241 (454,803)
Liability for uncertain tax positions 2,502,791 840,611 755,414
Deferred taxes 48,851,188 (4,632,976) (5,179,877)
Settlement of foreign currency derivatives (2,623,318) (8,898,838) 1,337,319
Net cash provided by (used in) operating activities (147,758,937) 60,124,114 (58,487,119)
Investing activities:      
Decrease (increase) in restricted cash (243,137,142) 23,614,897 (987,019)
Payment to acquire subsidiaries   (6,104,823)  
Investment in affiliates (3,428,751) (5,667,627) (1,503,531)
Proceeds from disposal of investment 555,475   2,524,541
Purchase of property, plant and equipment (60,481,021) (205,419,189) (134,314,791)
Proceeds from disposal of property, plant and equipment     291,846
Net cash used in investing activities (306,491,439) (193,576,742) (133,988,954)
Financing activities:      
Proceeds from short-term borrowings 791,596,176 1,808,463,199 917,514,400
Repayment of short-term borrowings (692,071,052) (1,721,463,494) (695,513,690)
Proceeds from long-term borrowings 143,965,319 89,023,852 89,659,607
Sales of subsidiary shares to non-controlling interest     145,128
Capital contribution from non-controlling interest 4,426,535 467,720  
Payment for repurchase of convertible notes (1,000,000)    
Proceeds from issuance of warrant 2,500,000    
Proceeds from exercise of stock options 158,766 1,256,948 823,560
Net cash provided by financing activities 249,575,744 177,748,225 312,629,005
Effect of exchange rate changes 2,648,135 11,047,381 8,387,882
Net increase (decrease) in cash and cash equivalents (202,026,497) 55,342,978 128,540,814
Cash and cash equivalents at the beginning of the year 343,994,679 288,651,701 160,110,887
Cash and cash equivalents at the end of the year 141,968,182 343,994,679 288,651,701
Supplemental disclosure of cash flow information:      
Interest paid, net of amounts capitalized 57,914,890 46,345,299 21,211,228
Income taxes paid 9,698,512 30,929,617 13,635,216
Supplemental schedule of non-cash activities:      
Amounts due from disposal of subsidiaries or affiliates included in prepaid expenses and other current assets 715,934 714,182  
Property, plant and equipment cost included in other payables 16,814,481 36,495,522 22,199,024
Module contribution in exchange for minority investment in associates $ 15,874,847