Exhibit 10.40

Confidential Materials omitted and filed separately with the

Securities and Exchange Commission.
Asterisks denote omissions.

Contract Amendment to the Purchase Contract No.

06.7IC014

for the Core Components
of the Electrical Control System of

FL 1500 Wind Turbine

This contract is made according to the purchase contract for FL1500 WT core components of electrical control system.

This
contract is made and amended according to the delivery quantities for the core components of electrical system signed between Sinovel Wind Co., Ltd and Windtec Windtec Systemtechnik Handels GmbH in 2007.

Apart from the following amendment, all other terms and conditions remain the same as what are stated in the original contract.

Quantity: Purchase another [**] sets of core components on the basis of the original purchasing quantity [**] sets, the unit price of each set remains unchanged.

Delivery: The delivery time of the original [**] sets remains unchanged; the delivery time for additional [**] sets will be made according to the delivery
time (FOB) as follows:



| |  |             |  |                 |  | 
| |  | ----------- |  | --------------- |  | 
| |  | FOB date    |  | Quantity (Sets) |  | 
| |  | Jul 20,2007 |  | [**]            |  | 
| |  | Aug 20,2007 |  | [**]            |  | 
| |  | Sep 20,2007 |  | [**]            |  | 
| |  | Oct 20,2007 |  | [**]            |  | 
| |  | Nov 20,2007 |  | [**]            |  | 
| |  | Dez 20,2007 |  | [**]            |  | 
| |  | Total       |  | [**]            |  | 



---

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

|          |  |                                                                       
|--------- |  | ----------------------------------------------------------------------
|          | 
|Address:  |  | Culture Building No. 59, Zhongguancun Street, Haidian, Beijing, China,
|Postcode: |  | 100872                                                                

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

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

|              |  |           
|------------- |  | ----------
|              | 
|Signing date: |  | 2007.03.06



|               |  |                                                     |  | 
|-------------- |  | --------------------------------------------------- |  | 
|Buyers Agent: |  | Dalian Huarui Heavy Industry International Co., Ltd

|         |  |                                                                       |  | 
|-------- |  | --------------------------------------------------------------------- |  | 
|Address: |  | 12/F Huarui Building, No. 169, Bayi Road, Xigang Dist., Dalian, China

|     |  |                                                |  | 
|---- |  | ---------------------------------------------- |  | 
|Fax: |  | (0086)411-86852398    Tel:  (0086)411-86852376

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

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



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

|         |  |                                           |  | 
|-------- |  | ----------------------------------------- |  | 
|Address: |  | Schleppeplatz 5, 9020 Klagenfurt, Austria

|     |  |                                               |  | 
|---- |  | --------------------------------------------- |  | 
|Fax: |  | (0043)463-4446044    Tel: (0043) 463-444604-0

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

|              |  |                 |  | 
|------------- |  | --------------- |  | 
|              | 
|Signing date: |  | Feb. 14th, 2007