Document:

Purchase Contract No.FDCG07061

 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:	  	2007-11-30Purchase Contract No.FDCG08050

 Exhibit 10.44 
 Confidential Materials omitted and filed separately with the 
 Securities and Exchange Commission.
Asterisks denote omissions. 
 The Purchase Contract No. FDCG08050 
 for the Electrical System of SL 3000 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 
 WindtecTM Systemtechnik Handels GmbH in Austria (hereinafter referred to as Seller) in a friendly way.

 The contract equipment is used for the purchasing contract of the electrics for SL 3000 wind turbine which is signed between Buyer and Seller. 

Buyer and Seller agreed as follows: 
  

	1.	Definition 

 In construing this contract, the following words and
expressions shall have the meanings hereby assigned to them unless otherwise specified in the contract. 
  

	1.1	Contact means this contract, including Article 1 to Article 20. 

  

	1.2	Contract price means the price payable to Seller under the contract for the full and proper performance of its contractual obligations, which is not influenced by the price
fluctuations. 

  

	1.3	Contract currency means the currency used in the payment under the contract, which is Euro. 

  

	1.4	Buyer’s Bank means Bank of China designated by Buyer for the other banks designated by Seller. 

  

	1.5	Sellers Bank means Bank Austria Creditanstalt AG. 

  

	1.6	Effective date of the contract means the date when the contract enters into force upon fulfillment of the conditions stated in Article 20. 

  

	1.7	Contract equipment means the 50 Hz electrics of SL 3000 wind turbine. 

  

 1 

	2.	Scope of Supply: 

 Each set comprises of: 
  

									
	 Pos.
	  	 Name
	  	No.	  	Units	  	Total Price
	1	  	Nacelle Cabinet (incl. Converter) plus Power Supply Cabinet (located in TB)	  	+CC300/+CC310	  	1	  	EUR [**]
	  	  	+NC300/+NC310	  	  	EUR [**]
	  	  	+PSC100	  	  	EUR [**]
	  	  	+CRO300	  	  	EUR [**]
	2	  	IPS (Internal Power Supply)	  	+IPS100	  	1	  	EUR [**]
	3	  	Slip Ring inc,. Overvoltage Protection	  	+SR300/+OVP400	  	1	  	EUR [**]
	4	  	Hub Cabinets inc,. Power Caps Cabinets	  	+HC400/+HC410	  	3	  	EUR [**]
	  	  	+HC420/+PC400/	  	  
	  	  	+PC410/+PC420	  	  
	5	  	Servo Pitch Motor	  	+PM400/+PM410/	  	3	  	EUR [**]
	  	  	+PM420	  	  
	6	  	Tower Base Cabinet incl. SCADA	  	+TBC100	  	1	  	EUR [**]
	7	  	CMS (Condition Monitoring System)(1)	  		  	1	  	EUR [**]
	  	- incl. CPU MX213	  	  	  
	  	- incl. AIC 212 Module	  	  	  
	  	- incl. Dummy Module LM201	  	  	  
	  	- incl. Electrical Cabinet MKL4 machined	  	  	  
		  		  	TOTAL VALUE	  	EUR [**]
		  		  		  		  	 

  

	(1)	Sensors are beyond SELLER’s scope of core components supply. The respective specification shall be defined by SELLER but purchased by BUYER separately.

  

	3.	Quantities: 

 Total number of goods is 4 sets. 
  

	4.	Price 

 The total contracting price will be [**] Euros
(INCOTERNS 2000, FOB packed). 
  

	5.	Port of shipment: 

 Goods shall be on shipment from main European
seaport or Austria airport. 
  

	6.	Delivery Period: 

 The delivery will be made in batches as per
preliminary schedule below. 
 CW 30, 2008 – [**] sets, tested 
 CW 35, 2008 – [**] sets, tested 
  

 2 

	7.	Documentation 

 Seller shall provide to the Buyer the certificate
and test report of the converter together with the equipment. 
  

	8.	Payment Schedule 

 95% by L/C at sight. 
 Two weeks before each shipment date, an irrevocable Letter of Credit at an amount of 95% of each shipment value shall be issued by a first class bank. The L/C shall be
according to ICP600. If L/C is delayed, the delivery time will be postponed accordingly. 
 5% Retention Bond: 
 The Retention Bond shall be paid upon the expiry of warranty period of 24 months after finished commissioning, or 30 months after the delivery, whichever is earlier
– within 14 days, under the precondition that the availability of the electrical control system for each WT is at least [**]% during such period. Such percentage will be the average of a respective wind park. The dependency of this 5%-payment
from an availability of [**]% will only be on the condition that (i) control cabinets have been manufactured by BUYER under supervision and instruction of Seller, (ii) test and quality of electrical cabinets have been released by Seller,
(iii) fault of electrical control system will be diagnosed by Seller, (iv) replacement of components will be executed by BUYER within 24 hours, and (v) Seller will have continuous and full access to the SCADA system of the respective
wind turbines. 
 BUYER is responsible for item I-V. If any of these items is not fulfilled, the retention bond has to be paid to Seller even in case of an
availability of at least [**]% has not been reached. 
 Seller must provide the following performance bond to Buyer: 
 Within 30 days after effectiveness of the contract, SELLER shall through SELLER’s bank open an irrevocable performance bond in favour of BUYER, for an amount of EUR
100,000.00. Validity of the guarantee shall be by the end of February 2009. 
  

	9.	The Seller shall supply the following documents as part of L/C paperwork: 

  

	•	 	 B/L or Air Way Bill 

  

	•	 	 Commercial Invoice 

  

	•	 	 Packing List 

  

	•	 	 Certificate of Origin 

  

	•	 	 Certificate of quarantine for Packing Wood; Declaration for Packing Wood issued by Seller marking IPPC 

  

	•	 	 Shipping Advice 

  

	•	 	 Quality Certificate 

 The details refer to the
detailed definition in L/C. 
  

 3 

	10.	Delivery notice 

 Seller shall complete the delivery of Contract
Equipment in batches and on time as required in article 6. Two (2) weeks before shipping, Buyer will be informed about the exact date of delivery. 
  

	11.	Packing and Marking 

 Unless otherwise specified in the contract,
the contract equipment shall be packed by Seller in a properly manner. And necessary measures shall be taken to protect the contract equipment from moisture, rain, rust, corrosion, shock and other damages according to their different characteristics
so as to withstand numerous handling, loading and unloading as well as long distance sea and inland transportation. 
 The following documents shall be
enclosed in each package of the Contract Equipment: 
  

	•	 	 Two (2) copies of detailed packing list; 

  

	•	 	 Two (2) of quality certificate; 

  

	•	 	 One (1) copy of technical documentation for relevant Contract Equipment. 

  

	12.	Inspection 

 Seller shall inspect the Contract Equipment and issue
the quality certificates as well as inspection records. All involved expenses shall be for Seller’s account. The quality certificates and inspection records including detail and result of inspection before delivery shall be submitted by Seller
to Buyer. 
  

	13.	Warranty 

 Seller warrants, that the Contract Equipment shall be
completely new, advanced in technology and superior in quality, free from any defect in design, material and workmanship, suitable for the use and purpose and in conformity with the technical specification. 
 Seller warrants that the technical documentation shall be complete, clear and correct. Warranty period is 24 months after finished commissioning, or 30 months after the
delivery, whichever is earlier. 
 Warranty means within warranty period in case of any damage or problem of any core components, that the components for
replacement will be provided by Seller free of charge and Seller should ensure timely supply of spare parts. Seller shall correct any such failure either at its option, (i) by repairing any defective or damaged part or parts or the supplied
products, or (ii) by making available any necessary repaired or replacement parts. Fault of electrical control system will be diagnosed by Seller and replacement of components will be executed by BUYER, each party at his own expense.

  

	14.	Penalty for delayed delivery 

 In case of delayed delivery of any
shipment, starting from the second week of delay, every week of delay will be charged [**]% of the price of the delayed set as penalty, only a delay for more than 4 days is counted as one complete week Sum of the above mentioned penalty shall not
exceed [**]% of the total contract price. Payment of the delayed delivery penalty shall not relieve Seller from the obligation of continuing delivery of relevant contract equipment. 
  

 4 

	15.	Claims 

 15.1 In case the Contract Equipment supplied by Seller does
not meet the specified technical performance during the Warranty Period and Seller doesn’t fulfill his responsibility according to article 13, Buyer has the right to lodge claims against Seller, and Seller shall settle the claims upon the
agreement of Buyer in the following way: 
 1) Repair or remove the defects and discrepancies of the equipment at Seller’s expense. In case Seller cannot
send his personnel to the Job Site, Buyer shall have the right to do the repair or removal of the defects and discrepancies and all the expensed incurred should be borne by Seller. 
 2) Replace the defective equipment or technical documents with new one at Seller’s expenses and Seller shall guarantee the quality of the replaced equipment for a recalculated warrantee period. The replaced
and/or supplemented equipment shall be delivered DDP to the Job Site. 
 In case Seller fails to make proposals for settling the claims according to any
and/or all the ways mentioned above within 14 days after notification of the claim raised by Buyer, Buyer shall have the right to recover the claimed amount from Retention Bond (maximum up to 5% of the total contract price). 
 15.2 The notice of claim for the defective equipment shall be effective if it is issued not later than thirty (30) days after the expiration of the Warranty Period,
but the claim must be detected within the warranty period (proved and reported by an independent expert). 
 15.3 In case Seller fails to accept the claim
within thirty (30) days after receipt of Buyer’s claim, the claim shall be regarded as not acceptable by Seller. 
  

	16.	Force Majeure 

 Neither party shall be held responsible for failure
or delay to perform all or any party of this contract due to flood, fire, earthquake, snowstorm, drought, hailstorm, hurricane, or any other events that are beyond the control of the affected party and could not reasonably be expected at the time of
conclusion of the contract or have been avoided or overcome by such party. However, the party who’s performance is affected by the event of Force Majeure shall give a notice to the other party of its occurrence as soon as possible and a
certificate or a document of the occurrence of the Force Majeure event issued by the relative authority or a neutral independent third party shall be sent to the other party not later than (14) days after its occurrence. If the event of Force
Majeure event continues for more than (180) days, both parties shall negotiate the performance or the termination of this contract. In the case of such a termination either party shall bear its own costs, further claims for compensation in
connection with the termination shall be excluded. 
  

	17.	Taxes and Duties 

 17.1 All taxes in connection with and in the
execution of the contract levied by the Chinese government on Buyer in accordance with the tax laws of P.R. China shall be borne by Buyer. 
  

 5 

 17.2 All taxed levied by the Chinese government on Seller, in connection with and in the execution of the contract,
according to Chinese tax laws and the agreement between the government of the People’s Republic of China and the Government of Seller’s country for the reciprocal avoidance of double taxation and the prevention of fiscal evasion with
respect to taxes on income shall be borne by Seller. 
 17.3 All taxes arising outside of China in connection with and in execution of the contract shall be
borne by Seller. 
  

	18.	Arbitration 

 All disputes arising from, or in connection with the
execution of the contract, shall be settled through friendly discussion between the two parties. In case no agreement can be reached throughout, the disputes shall be submitted to Chamber of Commerce in Zurich Switzerland, for Arbitration.

 Not withstanding any reference to arbitration, the two parties shall continue to perform their respective obligations under the contact unless the two
parties otherwise agree. 
  

	19.	Termination 

 19.1 Buyer may, without prejudice to any remedy by
Seller for Seller’s following breach of contract, by written notice of default sent to Seller, terminate the contract in whole or in part, if Seller fails to deliver any or all of the contract Equipment within 120 days after the delivery time
specified in Article 6. 
 19.2 Buyer may at any time terminate the contract, by giving written notice to Seller in case Seller becomes bankrupt or otherwise
insolvent, and such termination does not prejudice or affect any right of action or remedy available to Buyer. The same applies vice versa to Seller. 
  

	20.	Effectiveness of the Contract and Miscellaneous 

  

	20.1	The contract becomes valid on signing by the authorized representatives of the two parties of the Contract. 

  

	20.2	The present contract shall be valid for 3 years from the effective date of the contract, however the contract shall become null and void automatically when each party of the
contract has fulfilled its rights and obligations under the contract. 

  

	20.3	At the expiration of the Contract, any unsettled credit and debt under the Contract shall not be affected by the expiration of the Contract. The debtor shall still effect his
obligation of reimbursement to the creditor. 

  

	20.4	The Contract shall be made in English. 

  

	20.5	All amendments, supplements and alternations to the terms and conditions of the Contract shall be made in written form and signed by the authorized representatives of the two
Parties. 

  

	20.6	Unless otherwise stipulated in the Contract, the terms and conditions of the Contract shall be interpreted in accordance with INCOTERMS (2000 Edition). 

  

	20.7	No assignment of any right or obligation under the Contract shall be made by either party to a third party without the previous consent of the other party. 

 

 6 

	20.8	The communication between the two parties shall be conducted in written form. The fax concerning the important matter shall be confirmed timely by the registered or express mail.

 Buyer: Sinovel Wind Co., Ltd 
 Address:
Culture Building, No.59, Zhongguancun Street, Haidian, Beijing, China 
 Post code:  100872 
 Fx:    (0086) 10-82500072 
 Ph:    (0086) 10-62515566 
  

			
		
	 Liu Zhengqi:
	 	 /s/ Liu Zhengqi

		 	(Signature)
	
	Signing date:    March 7th, 2008

 Buyer’s Agent: China National Machinery & Equipment Import & Export Corporation 
 Address:  12/F 178, Guangan Men Wai Street, Xuan Wu District, Beijing, China 
 Fx:    0086(0)10-63452264 
 Ph:    0086(0)10-63452250 
  

			
		
	Authorized representative:	 	  

		 	(Signature)
		
	Signing date:	 	  

 Seller: WindtecTM Systemtechnik Handels GmbH 
 Address:  Schleppeplatz 5,9020 Klagenfurt, Austria 
 Fx:    (0043) 463-444604-44 
 Ph:    (0043) 463-444604-10 
  

			
		
	Gerald Hehenberger:	 	 /s/ Gerald Hehenberger

		 	(Signature)
	
	Signing date:    March 7th, 2008

  

 7 

 APPENDIX 1 
 Single Line Diagram SL3000 
 

 
  

 8 

 [Confidential treatment has been requested for the remainder of this exhibit] 
  

 9 

 APPENDIX 2 
 Main Components in Cabinets for SL3000 
  

					
	 cabinet
	  	 main components
	  	 technical data

	+CC3x0	  	grid choke	  	[**]
		  	generator choke	  	[**]
		  	conntectors	  	circuit breaker more than [**]
		  	PM3000	  	converter
		  	control unit	  	[**] Components for communication
		  	busbar	  	[**] per phase lenght [**] meters( not included connections)
		  	high flexible cables	  	for connections
		  	cabinet	  	see attached dimensions, protected for vibrations
			
	+PSC100	  	Stator Circuit Breaker with min Protection [**]	  	circuit breaker [**]
		  	Rotor Circiut Breaker with min Protection [**]	  	circuit breaker [**]
		  	NH-fuse for auxiliary power supply	  	disconnector functionality
		  	busbar	  	[**] per phase lenght [**] meters
		  	cabinet	  	see attached dimensions, protected for vibrations

  

 10 

 APPENDIX 3 
 Dimensions of Cabinets for SL3000 
 [Confidential treatment has been requested for this exhibit in its
entirety.] 
  

 11

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