Exhibit 4.20
 Translation




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Buyer: Changzhou Trina Solar Energy Co., Ltd.Domicile (Correspondence Address):
    
    No. 2, Tianhe Road, Xinbei District Electronic Industry Park,
Changzhou, Jiangsu Province
  Seller: Jiangsu Zhongneng Polysilicon Technology Development Co., Ltd.Domicile (Correspondence Address):
    
    No. 66, Yangshan Road, Xuzhou Economic Development Zone
   Article I
 Article II [****].   
 
 
    
    This portion of the Supplementary Agreement (I) to the
Polysilicon Supply Contract has been omitted and filed separately with the
Securities and Exchange Commission, pursuant to Rule 406.  2




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Article III
 Article IV
 1.
    
    Quality
  2.
    
    Quantity and Price
  3.
    
    Payment
 3.1
    
    Advance Payment: the Buyer shall make the Advance Payment to the Seller in accordance with
Article II under this Supplementary Agreement.
 3.2
    
    Payment for Goods: the Parties agree on the payment arrangements detailed in Exhibit B-1
under this Supplementary Agreement. In the event the Seller fails to receive the
corresponding payment for goods in full, it is entitled to refuse to deliver products to the
Buyer.
 3.3
    
    The Seller shall issue to the Buyer the corresponding invoice (including VAT) within fifteen
(15) days after the Buyer makes the full payment for the products of current month.
  3




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4.
    
    Packaging and Labeling
 4.1
    
    Packaging of Silicon Wafers: provide packaging specialized for long-distance transportation
to make sure that the goods is free from damage or contamination when arriving at the
warehouse designated by the Buyer. If the goods is damaged, lost or contaminated during the
course of transportation due to improper packaging, the Seller shall assume all the
liabilities. If damaged wafers are less than 0.3% of the Silicon Wafers delivered that time,
the Seller will be exempted from such liabilities.
 4.2
    
    Labeling: The Seller shall label the manufacturer, production batch number, specifications,
weight and production date on the interior and exterior sides of the packaging if so requested
by the Buyer.
 5.
    
    Delivery
  6.
    
    Inspection
 6.1
    
    Quantity inspection: the Buyer shall inspect the quantity of the goods within ten working
days after the Silicon Wafers arrive at the Buyers factory. In the event the Buyer finds
that there is shortage in quantity or more than 0.3% of the total goods delivered are broker
or crushed wafers, it shall notify the Seller in writing immediately and the Seller shall make
up for the short quantity within fifteen days after receiving the written notice from the
Buyer. The prerequisite for a make-up delivery of wafers is that the Buyer shall preserve the
complete packaging. The Seller shall not be responsible for damaging to wafers resulted from
a damaged or broken external packaging. The Silicon Wafers hence supplied shall be in
compliance with the quality specifications detailed in Exhibit A-1 under this Supplementary
Agreement or the amendments thereto by the Parties. In the event the Buyer fails to notify
the Seller in writing regarding the quantity shortfall within the aforesaid time limit, it
shall be deemed that the Buyer has no objection to the quantity of the products.
 6.2
    
    Quality inspection: the quality and specifications of the Silicon Wafers shall be in
compliance with the specifications quality agreed in Exhibit A-1 under this Supplementary
Agreement and the amendments thereto by the Parties. The Buyer shall inspect the quality of
the goods within thirty days after the delivery of the Silicon Wafers by the Seller. In the
event that, during the inspection within thirty days after the delivery of the Silicon Wafers
by the Seller, the Buyer finds that the quality technical specifications is not in compliance
with Exhibit A-1 under this Supplementary Agreement and the amendments thereto by the Parties,
it shall notify the Seller in writing immediately and is entitled to request the Seller to
change the Silicon Wafers which are not in compliance with Exhibit A-1 under this
Supplementary Agreement and the amendments thereto within twenty days after receiving the
written notice from the Buyer. The changed goods shall be in compliance with the technical
specifications agreed in Exhibit A-1 under this Supplementary Agreement and the amendments
thereto by the Parties. In the event that the Buyer fails to notify the Seller in writing
regarding the quality shortfall within the aforesaid time limit, it shall be deemed that the
Buyer has no objection to the quality of the products.
  4




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6.3
    
    Other inspection: the Buyer shall inspect the number of packages, external appearance and
weight of the Silicon Wafers when taking delivery of the goods and shall raise objections (if
any) on site. If the Buyer fails to raise objections on site, it shall be deemed that the
Buyer has no objection to the number of packages, exterior appearance and weight of the
products.
 6.4
    
    Prior to delivery, the Buyer is entitled to designate personnel to inspect the products at
the hand-over venue, but he/she shall not affect the business operation of the Seller and
shall comply with the Sellers internal regulations and guidelines such as production safety.
 6.5
    
    All the relevant expenses resulting from the change of goods under the above Article 6.2
shall be borne by the Seller.
 6.6
    
    In the event that the Parties dispute about the quality of the goods, before the quality of
the goods is finally determined pursuant to Article 3.4 Section 1 under the Long-Term
Agreement, if the Seller fails to change the goods per the Buyers request, Section 8.1 hereof
shall not apply. If it is finally determined that the goods are not in compliance with the
quality specifications specified in Exhibit A-1 under this Supplementary Agreement and the
amendment thereto by the Parties pursuant to Article 3.4 Section 1 under the Long-Term
Agreement, the Seller shall change the goods within twenty days after the day when the
inspection report is issued by the official inspection institution provided by the aforesaid
Article 3.4 Section 1 under the Long-Term Agreement and shall pay a penalty at a daily rate of
0.05% of the payment for the Silicon Wafers that shall be changed but not delivered from the
twenty-first day after the Buyer first issue the written notice for changing goods to the day
when the inspection report is issued. Otherwise, Article 8.1 hereunder shall apply.
 7.
    
    Silicon Wafers processing
  8.
    
    Defaulting Liability8.1
    
    Sellers Defaulting Liability
   5




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8.2
    
    Buyers Defaulting Liability
    6




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9.
    
    If there occurs an event of force majeure, the Party that delays performing or fails to
perform its obligations pursuant to Article IV under this Supplementary Agreement due to the
force majeure shall notify the other Party in writing the relevant status of the event of
force majeure within 14 days after the occurrence of such event. If the event of force
majeure does not disappear or cannot be overcome within a consecutive of six months from the
day when the cause of force majeure occurs, the other Party is entitled to unilaterally
terminate the supply of Silicon Wafers agreed in this Supplementary Agreement and the Parties
shall consult to settle the following issues in accordance with relevant laws.
 Article V
 Article VI
 Article VII
  7




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Article VIII
 Article IX
 Article X
 Article XI
 Article XII
  8




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Representative:
    
    /s/ Gao Jifan(with common seal of Changzhou Trina Solar Energy Co., Ltd.)
 Position:
    
    CEO  August 19, 2008
  Representative:
    
    /s/(with common seal of Jiangsu Zhongneng Polysilicon
Technology Development Co., Ltd.)
 Position:
    
    August 19, 2008
  9




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Exhibit A-1
 Specifications of Solar Monocrystalline 125x125mm silicon wafers
 
 
 
    
    This portion of the Supplementary Agreement (I) to the
Polysilicon Supply Contract has been omitted and filed separately with the
Securities and Exchange Commission, pursuant to Rule 406.  10




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Exhibit B-1
 Supply Quantity, Price and Advance Payment of Products
  Month
    
    Unit
    
    September
    
    
    October
    
    
    November
    
    
    December
    
    
    TotalPlanned quantity of
products supplied
    
    Ton
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    226Unit price with tax
included
    
    RMB/kg
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    Total price with
tax included
    
    RMB
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    Monthly settlement
date
    
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
  Quarter
    
    
    
    First quarter
    
    
    Second quarter
    
    
    Third quarter
    
    
    Forth quarter
    
    
    TotalPlanned quantity of
products supplied
    
    Ton
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    1500Unit price with tax
included
    
    RMB/kg
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    Total price with
tax included
    
    RMB
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
 
 
    
    This portion of the Supplementary Agreement (I) to the
Polysilicon Supply Contract has been omitted and filed separately with the
Securities and Exchange Commission, pursuant to Rule 406.  11




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Year
    
    
    
    2010
    
    
    2011
    
    
    2012
    
    
    2013
    
    
    2014
    
    
    2015
    
    
    TotalQuantity of
Polysilicon
    
    Ton
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    16350Unit price with tax
included of
Polysilicon
    
    RMB/kg
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    Total price with
tax included of
Polysilicon
    
    RMB
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    Quantity of Silicon
Wafers (125x125mm)
    
    pc
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    912,000,000Unit price with tax
included of Silicon
Wafers (125x125mm)
    
    RMB/pc
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    Total price with
tax included of
Silicon Wafers
(125x125mm)
    
    RMB
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    Total Contract Price
    
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    Advance PaymentTotal Advance Payment
    
    RMB
    
    
    [****]
    Advance Payment Made
    
    RMB
    
    
    [****]
    Advance Payment to be Made
    
    RMB
    
    
    [****]
    Progress for the Advance
Payment to be Made (Paid
by Such Date)
    
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    Progress for the Advance
Payment to be Made
(Amount Due on Each
Payment Date)
    
    RMB
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
    
    
    [****]
    
 
 
 
 
 
 
    
    This portion of the Supplementary Agreement (I) to the
Polysilicon Supply Contract has been omitted and filed separately with the
Securities and Exchange Commission, pursuant to Rule 406.  12