Exhibit 10.43

Confidential Materials omitted and filed separately with the

Securities and Exchange Commission.
Asterisks denote omissions.

The Purchase Contract No. FDCG07061

for the software of SL1500 Wind Turbine

This Purchase Contract is signed between

Sinovel Wind Co., Ltd (hereinafter referred to as Buyer)

Buyers Agent: China National Machinery & Equipment Import & Export Corporation (hereinafter referred to as Buyers agent)

and

Windtec Systemtechnik Handels GmbH in Austria (hereinafter referred to as Seller) in a friendly way.

Buyer and Seller agreed as follows:



|1. | Scope of Supply:
|-- | ----------------

[**] sets of software comprising:



| |  | SL1500 software program for pitch converter, yaw converter, IGBT converter and PLCs; according to Technical Specification of SL1500 Wind Turbine.
|- |  | -------------------------------------------------------------------------------------------------------------------------------------------------



|2. | Prices:
|-- | -------

The delivery price is CIF Dalian [**] EURO per set. The total
contract price is CIF Dalian [**] EURO.



|3. | Conditions:
|-- | -----------

General Terms of Delivery issued by the Austrian Electrical
and Electronics Industry Association, Ed. Jan. 2002



|4. | Warranty:
|-- | ---------

Warranty period is 12 months after wind turbine has arrived on
the wind farm and finished the commissioning, or 18 months after the delivery (shippment-date), whichever is earlier.



|5. | Delivery:
|-- | ---------

The software of PLC and converter will be sent out by 1 off CD
and/or email per batch, as a valid licence for the number of sets indicated therein. The delivery will be made in batches as per preliminary schedule below (shippment date):



|     |  |      |  |      |  |      |  |      |  |      |  |      |  |      |  |      |  |      |  |      |  |     
|---- |  | ---- |  | ---- |  | ---- |  | ---- |  | ---- |  | ---- |  | ---- |  | ---- |  | ---- |  | ---- |  | ----
|Jan  |  | Feb  |  | Mar  |  | Apr  |  | May  |  | Jun  |  | Jul  |  | Aug  |  | Sep  |  | Oct  |  | Nov  |  | Dec 
|[**] |  | [**] |  | [**] |  | [**] |  | [**] |  | [**] |  | [**] |  | [**] |  | [**] |  | [**] |  | [**] |  | [**]



---

|6. | Payments:
|-- | ---------

95% of each shipment value will be paid by T/T within 14 days
after each shipment date against receipt of the invoice;

5% of each shipment value, as the retention bond, shall be paid by T/T within 14 days after the
expiry of the warranty period.



|7. | Taxes:
|-- | ------

Note: Any applicable withholding tax according to the
Austrian-Chinese-Double-Tax-Treaty will be borne by Windtec in Austria.



|       |  |                      
|------ |  | ---------------------
|Buyer: |  | Sinovel Wind Co., Ltd

|         |  |                                                                             
|-------- |  | ----------------------------------------------------------------------------
|         | 
|Address: |  | 19/F, Culture Building, No. 59, Zhongguancun Street, Haidian, Beijing, China

|           |  |       
|---------- |  | ------
|Post code: |  | 100872

|     |  |                   
|---- |  | ------------------
|Fax: |  | (0086) 10-82500072
|Tel: |  | (0086) 10-62515566

|                           |  |                 |  | 
|-------------------------- |  | --------------- |  | 
|                           |  |                
|Authorized representative: |  | /s/ [Illegible] |  | 
|                           |  | (Signature)     |  | 

|              |  |            |  | 
|------------- |  | ---------- |  | 
|              |  |           
|Signing date: |  | 2007.12.24 |  | 



|               |  |                                                                 
|-------------- |  | ----------------------------------------------------------------
|Buyers Agent: |  | China National Machinery & Equipment Import & Export Corporation

|         |  |                                                                   
|-------- |  | ------------------------------------------------------------------
|         | 
|Address: |  | 12/F 178, Guangan Men Wai Street, Xuan Wu District, Beijing, China

|     |  |                   
|---- |  | ------------------
|Fax: |  | 0086(0)10-63452264

|     |  |                   
|---- |  | ------------------
|Tel: |  | 0086(0)10-63452250

|                           |  |                 |  | 
|-------------------------- |  | --------------- |  | 
|                           |  |                
|Authorized representative: |  | /s/ [Illegible] |  | 
|                           |  | (Signature)     |  | 

|              |  |            |  | 
|------------- |  | ---------- |  | 
|              |  |           
|Signing date: |  | 2007.12.19 |  | 



|        |  |                                   
|------- |  | ----------------------------------
|        | 
|Seller: |  | Windtec Systemtechnik Handels GmbH

|         |  |                                 
|-------- |  | --------------------------------
|         | 
|Address: |  | Schleppeplatz 5,9020 Klageenfurt

|     |  |                    
|---- |  | -------------------
|Fax: |  | (0043)463-44460444 
|Tel: |  | (0043)463-444604-11

|                           |  |                       |  |                  
|-------------------------- |  | --------------------- |  | -----------------
|                           |  |                      
|Authorized representative: |  | /s/ Gerald Heneberger |  | / General Manager
|                           |  | (Signature)           |  |                  

|              |  |            |  | 
|------------- |  | ---------- |  | 
|              |  |           
|Signing date: |  | 2007-11-30 |  |