Document:

Sale and Purchase Contract

 * Confidential treatment has been requested for certain portions omitted from this exhibit pursuant to Rule 24b-2
under the Securities Exchange Act of 1934, as amended. Confidential portions of this Exhibit have been separately filed with the Securities and Exchange Commission. 
 Exhibit 4.15 
 Supplemental Agreement for Silicon Wafer Supply Contract 
 between 
 Jiangsu Shunda
Semiconductor Development Co., Ltd. 
 and 
 JA Solar Co., Ltd. 
  
  
 Seller: Jiangsu Shunda Semiconductor Development Co., Ltd. 
 Buyer: JA Solar Co., Ltd. 
 April 29, 2008 
  

 1 

 * Confidential treatment has been requested for certain portions omitted from this exhibit pursuant to Rule 24b-2
under the Securities Exchange Act of 1934, as amended. Confidential portions of this Exhibit have been separately filed with the Securities and Exchange Commission. 
  

 Seller: 
 Jiangsu Shunda Semiconductor Development Co., Ltd.

 Legal representative: Ni Yunda 
 Buyer: 
 JA Solar Co., Ltd. 
 Legal representative: Yang Huaijin 
  

	1.	Background 

 Whereas, the Buyer and the Seller have signed the
Long-term Supply and Prepayment Agreement (hereinafter referred to as “Agreement”) on August 1, 2007 for monocrystalline silicon wafer. JA Solar Co., Ltd. has performed its duties and made prepayment to Jiangsu Shunda Semiconductor
Development Co., Ltd. pursuant to the terms and conditions of the Agreement. However, Jiangsu Shunda Semiconductor Development Co., Ltd. fails to supply monocrystalline silicon wafer to the Buyer on schedule and in full quantity in 2008 for certain
reasons. In order to effectively perform the Agreement executed on August 1, 2007, both parties agree to execute this supplement agreement to modify the supply plans from April 2008 to December 2008. 
  

	2.	Price and Quantity 

 Based on the negotiations and decisions between
Mr. Ni Yunda, the Seller’s general manager, and Sun Gang, the Buyer’s president, on April 25, 2008, the Parties reach the following agreements on quantity and price for monocrystalline silicon wafers from April 2008 to December
2008. 
 Price, Quantity and Supply Schedule for Monocrystalline Silicon Wafer 
  

											
	Year	  	Month	  	Size	  	Quantity
(10,000 pieces)	  	Price
(RMB)	  	Note
	 2008
	  	***	  	125 X 125	  	***	  	***	  	Tax included
	  	***	  	125 X 125	  	***	  	***	  	Tax included
	  	***	  	125 X 125	  	***	  	***	  	Tax included
	  	***	  	125 X 125	  	***	  	***	  	Tax included
	  	***	  	125 X 125	  	***	  	***	  	Tax included
	  	***	  	125 X 125	  	***	  	***	  	Tax included
	  	***	  	125 X 125	  	***	  	***	  	Tax included
	  	***	  	125 X 125	  	***	  	***	  	Tax included
	  	***	  	125 X 125	  	***	  	***	  	Tax included

  

 2 

 * Confidential treatment has been requested for certain portions omitted from this exhibit pursuant to Rule 24b-2
under the Securities Exchange Act of 1934, as amended. Confidential portions of this Exhibit have been separately filed with the Securities and Exchange Commission. 
  

	3.	Cell Processing 

 The Seller hopes that the Buyer supply cells to
the Seller in 2008, and the Buyer agrees to provide services to the Seller under the following circumstances: 
  

	1.	The Seller has supplied the monthly supply quantity listed in the above schedule; 

  

	2.	The Buyer’s output allows; 

  

	4.	Validity Term 

 This supplement agreement comes into effect with
signatures and seals of the Parties and expires on December 31, 2008. This supplement agreement is only a modification to the 2008 supply part of the Agreement executed on August 1, 2007, and the provisions concerning supply, payment and
otherwise from 2009 to 2011 shall stay the same, subject to the Agreement made on August 1, 2007. 
  

	5.	Applicable Law; Dispute Settlement 

 Formation, effectiveness,
interpretation and performance of this supplement agreement shall be governed by the laws of the PRC. In case of any dispute in connection with, or arising from performance of, this supplement agreement, either party is entitled to bring a lawsuit
to the Court in Shanghai, China. 
  

			
	 Buyer:
	  	Seller:
		
	 JA Solar Co., Ltd.
	  	Jiangsu Shunda Semiconductor
Development Co., Ltd.
		
	 Legal representative: Yang Huaijin
	  	Legal representative: Ni Yunda
		
	 Signature:                                     
         
	  	Signature:                                     
   
		
	 Date: April 29, 2008
	  	Date: April 29, 2008

  

 3Amendment of M.Setek and JA Solar Contract

 * Confidential treatment has been requested for certain portions omitted from this exhibit pursuant to Rule 24b-2
under the Securities Exchange Act of 1934, as amended. Confidential portions of this Exhibit have been separately filed with the Securities and Exchange Commission. 
  

 Exhibit 4.16 
 AMENDMENT of M.SETEK and JA SOLAR CONTRACT 
 As requested by M.SETEK Co. Ltd. (“M.SETEK”), M.SETEK and JA SOLAR Holdings Co. Ltd
(“JA SOLAR”) agreed to amend the Long Term Silicon Wafer Supply and Prepayment Agreement signed by Mr. Ritsuso Matsumiya of M.SETEK and Mr. Samuel Yang of JA SOLAR on June 5, 2007. 
  

	1.	This amendment is only for year of 2008. The terms and conditions for the remaining years of the contract do not and will not change. 

  

	2.	This amendment does not and will not relieve M.SETEK and JA SOLAR from the contractual obligations stated in the contract signed by Mr. Ritsuso Matsumiya of M.SETEK and
Mr. Samuel Yang of JA SOLAR on January 15, 2008. 

  

	3.	Considering M.SETEK’s difficulty in delivering silicon wafer according to the contract, JA SOLAR agreed in good will to accept polysilicon as an alternate product in 2008.

  

	4.	In case M.SETEK is not able to deliver silicon wafer in 2008, M.SETEK will deliver monthly *** metric ton (MT) of polysilicon and the recycled silicon powder from April 1 to
December 31 of 2008. 

  

	5.	The quality of the recycle silicon powder must pass JA SOLAR’s quality standard and achieve acceptable performance. Otherwise, M.SETEK agreed to replace recycle silicon powder
with polysilicon. 

  

	6.	The recycle silicon powder quantity should not exceed ***% of total monthly delivery, i.e., no more than *** MT. 

  

	7.	JA SOLAR and M.SETEK agreed that the price of polysilicon in this amendment is USD ***/kg (M.SETEK will set-off the prepayment as the rate of USD ***/kg) and the price for the
recycle polysilicon powder in this amendment is USD ***/kg (M.SETEK will set-off the prepayment at the rate of USD ***/kg). 

  

	8.	M.SETEK and JA SOLAR pledged to execute this amendment without fault. 

  

	9.	The term 10 in the contract signed on June 5 of 2007 remains valid for this amendment. 

  

	10.	M.SETEK and JA SOLAR agreed to meet before end of May of 2008 to update delivery schedule of the remaining months of 2008. 

  

			
	     /s/ Samuel Yang
	  	     /s/ Ritsuo Matsumiya

	Samuel Yang	  	Ritsuo Matsumiya
	Chief Executive Officer	  	President
	JA SOLAR Holdings Co. Ltd.	  	M.SETEK Co. Ltd.Silicon Wafer Supply Agreement between JingAo Solar Co., Ltd. and ReneSola Ltd.

 English translation for reference purpose only 
 Exhibit 4.17 
 Sale and Purchase Contract 
 Contract NO: YGX0711150001-122 
 Place of
Execution: Jiashan Zhejiang 
 Party A: JingAo Solar Co., Ltd  
 Address: JingLong Industrial Park, JingLong Street, NingJin, Hebei, China 
 Legal
representative:                 Yang Huaijin 
 Party B: Zhejiang Yuhui
Solar Energy Source Co. Ltd 
 Address: No. 8 Baoqun Road, Yao Zhuang Town Industrial Park, Jiashan, Zhejiang 
 Legal representative:                Li Xianshou 
 To satisfy business development requirements, Party A intends to purchase solar wafer (the “Product”) from Party B. Through friendly
negotiation, Party A and Party B hereby enter into this Contract in connection with the above purchase and relevant matters subject to the terms and conditions as set forth below: 
  

	1	Supply of Product 

 Party A agrees to purchase from
Party B and Party B agrees to supply to Party A, the Product in accordance with the price, quantity and quality described in this Contract during the period from 2008 to 2013 (the “Product Supply Period”). 
  

	2	Price and quantity of the Product 

  

									
	Time	  	Price (including tax)
	 	Quantity	  	Subtotal
	 2008.7-2009.6
	  	RMB 48	 	20 MW	  	8,000,000.00	  	RMB 384,000,000.00
	 2009.7-2010.6
	  	RMB 36	 	60 MW	  	24,000,000.00	  	RMB 864,000,000.00
	 2010.7-2011.6
	  	RMB 32	 	120 MW	  	48,000,000.00	  	RMB 1,536,000,000.00
	 2011.7-2012.6
	  	RMB 28	 	180 MW	  	72,000,000.00	  	RMB 2,016,000,000.00
	 2012.7-2013.6
	  	RMB 24	 	220 MW	  	88,000,000.00	  	RMB 2,112,000,000.00
		  		 	600 MW	  	240,000,000.00	  	RMB 6,912,000,000.00

 If both parties agree to the delivery of standard-square wafer with the specification of 150mm,
125*125, the prices for the relevant delivery periods shall be the prices above divided by 1.042. 
  

	3	Payment terms 

 To ensure the effectiveness of this
Contract, Party A shall pay RMB50,000,000.00 (RMB Fifty Million) to Party B on December 25, 2007; RMB100,000,000.00 (RMB One Hundred Million) by June 25, 2008; 

  

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RMB150,000,000.00 (RMB One Hundred and fifty Million) by December 25, 2008; RMB100,000,000.00 (RMB One Hundred Million) by June 25, 2009 and
RMB50,000,000.00 (RMB Fifty Million) by December 25, 2009; totaling up to RMB450,000,000.00 (RMB Four Hundred and Fifty Million), otherwise Party B may rescind this Contract. The prepayment will be deemed as part of the payment for the Product
of which the unit price is RMB 7 yuan (Seven Yuan), which means that for each wafer, Party A only needs to pay the part of the then effective unit price higher than RMB 7 yuan (Seven Yuan), the balance will be settled and the difference will be made
up. Party B shall issue the Full VAT invoices at that month, all the prepayment shall be paid when the Contract is completed. 
 From January
2010, if the performance price of this Contract fluctuates more than +/-5% of the average performance price of M. Setek, Deutscher Solar and REC etc. knowable for that year, both parties have the right to adjust the price at any time, and negotiate
a new price in writing friendly. Such written information with both parties’ signatures will constitute an indispensable schedule to this Contract. The performance price is determined by the latest written information only. 
  

	4	Quality standard 

 Party B shall provide Party A
with Products which comply with relevant specifications as set forth in “Schedule I: Technical Specification of the Solar Grade Wafer”. 
  

	5	Delivery and package 

 Party A is responsible for
the arrangements of transportation vehicles and payments of the transportation and insurance etc. Where Party A asks Party B for assistance in making such arrangements, Party B shall make all efforts in rendering such assistance; provided however,
that Party A shall still be liable for the costs and expenses arising therefrom. The package must meet transportation requirements for the solar grade wafer. 
  

	6	Inspection and Dissension 

 Party A shall inspect
the Product delivered by Party B within 5 days after receiving the Product. If Party A dissents with the quantity after inspection, it shall inform Party B in writing within 7 days after receiving the Product; should there be any
dissension in the quality, Party A shall inform party B in writing within 30 days after receiving the Product. 
 The quality of the
Product is subject to the inspection results, the standard of which have been agreed by both parties, but normal wear and tear within 2‰ will be allowed. The parties will discuss the indemnification only when the normal wear and tear exceeds
such scope. 
  

	7	Declaration, Representation and Warranty 

 Both
parties make the following declarations, representations and warranties to each other and acknowledge that the other party enters into this Contract upon these declarations, indemnities and warranties: 
 7.1    Both parties are enterprise legal persons established and validly existing under relevant laws of the establishment place and have executed
this Contract with the authority, approval and permission from their respective managements. 
 7.2    Both parties have the right and
capacity to enter into this Contract; and both parties will be legally bound by this Contract. 
 7.3    Both parties declare that there
is no circumstance that will exert a major adverse effect on their operation of business, nor other circumstance that may adversely affect the performance of this Contract, such as withdrawal of the business license or compulsory enforcement in
accordance with relevant laws. Both parties agree that if any of the above events occurs, one party shall notify the other party within 2 days from the occurrence of such an event. 
  

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	8	Liability for Breach of Contract 

  

	8.1	General principle 

  

	  	Any defaulting party shall bear the liability for breaching of contract and indemnify the other party the monetary damages resulting from such breach of contract. The amount of
damages shall be equal to the losses caused by the breach, including the expected profits after performance of the Contract, provided, however, that it shall not exceed the damages foreseeable by the defaulting party when the Contract is
executed. 

  

	8.2	Breach of contract by Party A 

  

	  	Party A shall indemnify Party B in accordance with the following provisions if Party A breaches the Contract as follows. Party A shall indemnify Party B with liquidated damages
equal to RMB 8,000,000.00 if Party B terminates the Contract unilaterally in accordance with the following provisions (where the liquidated damages are not enough to cover the losses incurred by Party B, Party A shall be liable for the
difference): 

  

	 	(1)	If the current payment is delayed in violation of the provisions of this Contract, Party A shall pay a monthly 1% liquidated damages for the late payment to Party B every five
working days. Party B has the right to terminate this Contract at its own discretion when the liquidated damages are more than RMB 4,000,000.00. Party B shall return the unsettled prepayment to Party A within 30 days after the termination of the
Contract. 

  

	 	(2)	Party B has the right to unilaterally terminate this Contract if Party A fails to disclose the circumstances which have had a major adverse effect on the business operation or may
have an adverse effect on the performance of this Contract in violation of the warranties in Article 9 of this Contract. 

  

	8.3	Breach of contract by Party B 

  

	  	Party B shall indemnify Party A in accordance with the following provisions if Party B breaches the Contract as follows. Party B shall indemnify Party A with liquidated damages
equal to RMB 8,000,000.00 if Party A terminates the Contract unilaterally in accordance with the following provisions (where the liquidated damages are not enough to cover the losses incurred by Party A, Party B shall be liable for the difference):

  

	 	(1)	If delivery is delayed in violation of the provisions of this Contract, Party B shall pay a monthly 1% liquidated damages for the late delivery to Party A every five working days.
Party A has the right to terminate this Contract at its own discretion when the liquidated damages are more than RMB 4,000,000.00. 

  

	 	(2)	Party A has the right to unilaterally terminate this Contract if Party B fails to disclose the circumstances which have had a major adverse effect on the business operation or may
have an adverse effect on the performance of this Contract in violation of the warranties in Article 9 of this Contract. 

  

	9	Force majeure 

 Non-performance or partial
non-performance of the obligations under this Contract due to force majeure and without the fault of either party shall not be deemed as breach of contract by such party, but the non-performing party shall take all necessary and practicable remedial
measures to mitigate the losses caused by Force majeure. 
  

 3 

 The party who is unable to perform its obligations under this Contract due to force majeure shall notify
the other party promptly in writing, and submit the report in respect of the non-performance, partial non-performance and the reason of late performance of the Contract to the other party within 15 days after occurrence of the event of force
majeure. 
  

	10	Confidentiality 

 10.1    Other than that
authorized under Article 10.2, Party A and Party B shall keep the following information in strict confidentiality: 
  

	 	(1)	The existence of business relationship under this Contract; 

  

	 	(2)	All the terms and the negotiations of this Contract; 

  

	 	(3)	The subject matter and the quantity of this Contract; 

  

	 	(4)	All the commercial and technical information involved in the performance of this Contract by Party A and Party B. 

  

	10.2	The parties may disclose the information as described in Article 10.1 only under the following circumstances: 

  

	 	(1)	The mandatory requirements of the laws applicable to both parties; 

  

	 	(2)	The mandatory requirements of any competent government authority or supervising institution; 

  

	 	(3)	Any party may disclose the information (if any) upon the confidential commitments of its professional consultants or its attorneys; 

  

	 	(4)	The information enters into the public domain without any party’s fault; 

  

	 	(5)	Prior written consent from both parties. 

  

	10.3	This article will survive the termination of this Contract and shall not be bound by time. 

  

	11	Governing Law and Dispute Settlement 

  

	11.1	The execution, validity, interpretation, performance and dispute settlement of this Contract are governed by the laws of mainland China. 

  

	11.2	All the disputes arising from the performance of this Contract or relating to this Contract shall be settled through friendly negotiation; if they cannot be settled through
negotiation, the dispute shall be submitted to the People’s Court that has competent jurisdiction over both parties. 

  

	12	Miscellaneous: 

  

	12.1	This Contract shall become effective upon execution by both parties. 

  

	12.2	If any party requires not to extend this Contract after the expiration in writing 30 days prior to the expiration of this Contract, this Contract will expire; this Contract will
automatically extend for another year if neither party requires as aforesaid. 

  

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	12.3	Schedule: <Technical Specification of the Solar Grade Wafer> constitutes an integral part of this Contract. 

  

	12.4	The order signed and confirmed by both parties according to this Contract constitutes an integral part of this Contract. The validity of the order in facsimile form is hereby
confirmed by both parties. 

  

	12.5	Any amendment to this Contact shall be agreed by both parties and amended in writing. 

  

	12.6	This Contract is made in two counterparts, each of which shall be held by one party. Both counterparts shall enjoy the same legal validity. 

  

	12.7	This Contract shall be performed independently without any duplication or overlapping performance of the contract executed or to be executed between Party A and Party B, unless both
parties agree to such performance in a writing that shall constitute a schedule to this Contract. 

 The Buyer: 
 JingAo Solar Co., Ltd 
  
  
 Legal representative or authorized representative:

 December 13, 2007 
 The Seller: 
 Zhejiang Yuhui Solar Energy Source Co. Ltd 
  
  
 Legal representative or authorized representative:

 December 13, 2007 
  

 5 

 Schedule I 
 Technical Specification of the Solar Grade Wafer 
 1. Type: P 
 2. Growth mode: CZ 
 3. Crystal orientation: 100+/-1.5o 
 4. Dimension:125+/-0.5mm 
 5. Diagonal:165+/-0.5mm 
 6. Thickness:200+/-25μm 
 7. Resistivity:0.5 ~ 3 W • cm 
 8. Lifetime: 3 10μs 
 9. Kerf:<15μm 
 10. Incision: Multi–lines 
 11. Precision<3000 pcs/cm3 
 12. TTV£30μm 
 13. Vertical Angle: 90o +/-1 o 
 14. Oxygen£1.2*1018atoms/cm3

 15. Carbon£1*1017atoms/cm3 
 16. Clean surface without sticky taint or extraordinary dot. 
 17. Edge collapse no larger than 1 X 0.5mm, and no more than
two collapses apiece 
 18. No hole, crack, contamination or obvious fingerprint 
  

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