Document:

<PAGE>
Confidential                                                        Exhibit 10.5
            (English Translation of the Original Contract in Chinese)

                            SILICON SUPPLY AGREEMENT

                                                     Contract Number: SF060706GP
                                      Place of Signing: Qidong, Jiangsu Province
                                                   Date of Signing: July 6, 2006

The Seller: ReneSola Co., Ltd.
The Buyer: Jiangsu Linyang Solarfun Co., Ltd.

This Contract is entered into by and between the Buyer and the Seller after
friendly negotiations, whereby the Seller agrees to supply silicon wafers to the
Buyer as follows.

Article 1. Name of Products, Technical Specifications, Quantity, Price and
Delivery Schedule:

<Table>
<Caption>
------------------------------------------------------------------------------------------------------------------------------------
   NAME OF PRODUCTS                 TECHNICAL SPECIFICATIONS                     QUANTITY         PRETAX UNIT   DELIVERY SCHEDULE
                                                                                                     PRICE
                                                                                                     (RMB
                                                                                                  YUAN/PIECE)
------------------------------------------------------------------------------------------------------------------------------------
<S>                     <C>                                                <C>                    <C>           <C>
                        1. Type: Type P

                        2. Width of silicon wafers: 125+/-0.5mm

                        3. Diameter of silicon wafers: 150+/-0.5mm

                        4. Thickness of silicon wafers: 220(+30/-0)(u)m

                        5. Resistivity: 0.5~3 (ohm symbol).cm,
                           3~6 (ohm symbol).cm

                        6. Minority carrier lifetime: > or = 8 (u)s

                        7. Surface damage: <15 (u)m

                        8. Cutting mode: multi-thread cutting                                                   0.4 million pieces
                                                                                                                shall be supplied
                        9. Crystal orientation: (100)+/-1 degree                                                per month during
                                                                                                                the period from
                        10. TTV < or = 30 (u)m                                                                  January 2007 to
Monocrystalline                                                                                                 June 2007, then
Silicon Wafer           11. Vertical angle: 90 degrees+/-0.3 degrees       6 million pieces       [*]           0.6 million pieces
                                                                                                                shall be supplied
                        12. Oxygen concentration: < 1x10(18)at/cm(3)                                            per month until
                                                                                                                December 2007.
                        13. Carbon concentration: < 5x10(16)at/cm(3)

                        14. Dislocation Density: < or = 3x10(3)/cm(2)

                        15. Notch: notch of crystal orientation shall be
                        no bigger than 1x0.3mm, and there shall be no
                        more than one notch on each wafer.

                        16. Broken edge: broken edge of wafers shall be
                        no bigger than 1x0.5 mm, and there shall be no
                        more than one on each wafer.

                        17. No stain and abnormal spot on surface. No
                        curve under naked eyes.
------------------------------------------------------------------------------------------------------------------------------------
                                Total Price                                [*]
------------------------------------------------------------------------------------------------------------------------------------

</Table>

 *Confidential Treatment Requested. The redacted material has been separately
               filed with the Securities and Exchange Commission.

                                        1
<PAGE>
Article 2.     Quality Requirement and Technical Standards: as set forth above
               in this Contract.

Article 3.     Place and Manner of Delivery: The products shall be delivered to
               the warehouse of the Buyer.

Article 4.     Manner and Cost of Transportation: The Seller shall be
               responsible for delivery and bear the cost.

Article 5.     Packaging Standard: Suitable for long-distance transportation of
               solar-grade monocrystalline silicon wafers.

Article 6.     Standard and Manner of Inspection and Period for Objection: After
               each delivery of the silicon wafers to the Buyer, the Buyer shall
               conduct full inspection of such silicon wafers pursuant to the
               specifications set forth herein before warehousing within a
               period of one workday for each 30 thousand pieces of silicon
               wafers. Silicon wafers shall be deemed defective if they are not
               in conformity with the specifications set forth herein, and the
               Seller shall remedy the defect by one-to-one replacement within 7
               days. If the Buyer discovers during the inspection that the
               quantity of any silicon wafers delivered is lower than the
               contract stipulated quantity, the Seller shall make up such
               shortfall within 7 days.

Article 7.     Terms of Payment: After this Contract is signed, the Buyer shall
               pay RMB30 million by July 12, 2006, another RMB30 million by July
               31, 2006, and RMB40 million by August 18, 2006 as deposits. Such
               deposit totaling RMB100 million will be set off against the
               payment for each shipment of products on an average basis. The
               remaining payment for each shipment of products shall be paid
               based on the actual quantity of such shipment of products within
               2 workdays after inspection and warehousing of the products by
               the Buyer.

Article 8.     Effectiveness of the Contract: This Contract shall take effect
               upon execution and terminate when all the obligations hereunder
               have been performed.

Article 9.     Liabilities for Breach of Contract: (1) If there is delay of
               payment by the Buyer over 7 workdays, then this Contract shall be
               terminated. (2) If either party fails to perform any of its
               obligations hereunder, the breaching party shall pay the
               non-breaching party liquidated damages equal to 1% of the amount
               in issue per month and this Contract shall continue in effect.
               (3) If this Contract is rendered unable to be performed due to a
               breach by either party hereto, the breaching party shall be
               liable under the Contract Law of the People's Republic of China.

                                       2
<PAGE>
Article 10.    Any dispute in connection with the performance of this Contract
               shall be settled through negotiations between the parties hereto.
               If no settlement can be reached, the dispute shall be submitted
               for arbitration to the arbitration commission in the place where
               this Contract is signed.

Article 11.    Miscellaneous: This Contract shall become effective after signed
               by and affixed with Companies' Seals of both parties. This
               Contract shall be executed in four originals, with each party to
               hold two. This Contract can be signed by fax. The Seller shall
               supply no less than 25MW silicon wafers to the Buyer in the year
               2008 and the price shall be negotiated separately. The price can
               vary in accordance with the thickness of silicon wafers.

<Table>
<Caption>
------------------------------------------------------------------------------------------------------------
                       The Seller                                               The Buyer
------------------------------------------------------------------------------------------------------------
<S>                                                         <C>
Name of the Company (seal): ReneSola Co., Ltd.              Name of the Company (seal): Jiangsu Linyang
                                                            Solarfun Co., Ltd.

Address: Yaozhuang Zhen Industrial Park, Jiashan,           Address: 666 Linyang Road, Qidong, Jiangsu
Zhejiang Province                                           Province

Legal Representative: Li Xianshou                           Legal Representative: Lu Yonghua
Authorized Agent: Li Xianshou                               Authorized Agent: Lu Yonghua
(SIGNATURE)                                                 (SIGNATURE)

Tel: 0573-4773130                                           Tel: 0513-83115763
Fax: 0573-4773063                                           Fax: 0513-83307011

Bank Name: Industrial and Commercial Bank of China,         Bank Name: Bank of China, Qidong Branch,
Jiashan Branch                                              Business Department
Account No.: 1204070009242025955                            Account No.: 647032159808091001
Tax No.: 330421753019961                                    Tax No.: 320681765140726
Code: 314117                                                Zip Code: 226200
------------------------------------------------------------------------------------------------------------
</Table>

                                       3<PAGE>
Confidential                                                        Exhibit 10.6
            (English Translation of the Original Contract in Chinese)

                            SILICON SUPPLY AGREEMENT

                                                     Contract Number: SF060326GP
                                               Place of Signing: Qidong, Jiangsu
                                                 Date of Signing: March 26, 2006

The Seller: ReneSola Co., Ltd.
The Buyer: Jiangsu Linyang Solarfun Co., Ltd.

This Contract is entered into by and between the Buyer and the Seller after
friendly negotiations, whereby the Seller agrees to supply silicon wafers to the
Buyer as follows.

Article 1. Name of Products, Technical Specifications, Quantity, Price and
Delivery Schedule:

<Table>
<Caption>
-----------------------------------------------------------------------------------------------------------------------------------
   NAME OF PRODUCTS                TECHNICAL SPECIFICATIONS                     QUANTITY          PRETAX UNIT   DELIVERY SCHEDULE
                                                                                                     PRICE
                                                                                                     (RMB
                                                                                                  YUAN/PIECE)
-----------------------------------------------------------------------------------------------------------------------------------
<S>                     <C>                                              <C>                      <C>           <C>
                        1. Type: Type P

                        2. Width of silicon wafers: 125+/-0.5mm

                        3. Diameter of silicon wafers: 150+/-0.5mm

                        4. Thickness of silicon wafers: 240+/-30(u)m

                        5. Resistivity: 0.5~3 (ohm symbol).cm,
                           3~6 (ohm symbol).cm

                        6. Minority carrier lifetime: > or = 8 (u)s

                        7. Surface damage: <15 (u)m

                        8. Cutting mode: multi-thread cutting

                        9. Crystal orientation: (100)+/-1 degree                                                For the period
                                                                                                                prior to the end of
                        10. TTV < or = 30 (u)m                                                                  June 2006, 0.1
Monocrystalline                                                                                                 million pieces shall
Silicon Wafer           11. Vertical angle: 90 degrees+/-0.3 degrees     2.5 million pieces       [*]           be supplied, and
                                                                                                                for each month
                        12. Oxygen concentration: < 1x10(18)at/cm(3)                                            thereafter until the
                                                                                                                end of June 2007,
                        13. Carbon concentration: < 5x10(16)at/cm(3)                                            0.2 million pieces
                                                                                                                shall be supplied.
                        14. Dislocation Density: < or = 3x10(3)/cm(2)

                        15. Notch: notch of crystal orientation shall
                        be no bigger than 1x0.3mm, and there shall be
                        no more than one notch on each wafer.

                        16. Broken edge: broken edge of wafers shall
                        be no bigger than 1x0.5 mm, and there shall be
                        no more than one on each wafer.

                        17. No stain and abnormal spot on surface. No
                        curve under naked eyes.
</Table>

  *Confidential Treatment Requested. The redacted material has been separately
               filed with the Securities and Exchange Commission.

                                        1
<PAGE>
<TABLE>
<Caption>

-----------------------------------------------------------------------------------------------------------------------------------
   NAME OF PRODUCTS                TECHNICAL SPECIFICATIONS                     QUANTITY          PRETAX UNIT   DELIVERY SCHEDULE
                                                                                                     PRICE
                                                                                                     (RMB
                                                                                                  YUAN/PIECE)
-----------------------------------------------------------------------------------------------------------------------------------
<S>                     <C>                                              <C>                      <C>           <C>

-----------------------------------------------------------------------------------------------------------------------------------
                                Total Price                              [*]
-----------------------------------------------------------------------------------------------------------------------------------
</TABLE>

Article 2.     Quality Requirements and Technical Standards: as set forth above
               in this Contract.

Article 3.     Place and Manner of Delivery: The products shall be delivered to
               the warehouse of the Buyer.

Article 4.     Manner and Cost of Transportation: The Seller shall be
               responsible for delivery and bear the cost.

Article 5.     Packaging Standard: Suitable for long-distance transportation of
               solar-grade monocrystalline silicon wafers.

Article 6.     Standard and Manner of Inspection and Period for Objection: After
               each delivery of the silicon wafers to the Buyer, the Buyer shall
               conduct full inspection of such silicon wafers pursuant to the
               specifications set forth herein before warehousing within a
               period of one workday for each 30 thousand pieces of silicon
               wafers. Silicon wafers shall be deemed defective if they are not
               in conformity with the specifications set forth herein, and the
               Seller shall remedy the defect by one-to-one replacement within 7
               days. If the Buyer discovers during the inspection that the
               quantity of any silicon wafers delivered is lower than the
               contract stipulated quantity, the Seller shall make up such
               shortfall within 7 days.

Article 7.     Terms of Payment: After this Contract is signed, the Buyer shall
               pay RMB20 million by March 30, 2006 and another RMB20 million by
               April 20, 2006, as deposit. Such deposit totaling RMB40 million
               will be set off against the payment for each shipment of products
               on an average basis. The remaining payment for each shipment of
               products shall be paid based on the actual quantity of such
               shipment of products within 2 workdays after inspection and
               warehousing of the products by the Buyer.

Article 8.     Effectiveness of the Contract: This Contract shall take effect
               upon execution and terminate when all the obligations under this
               Contract have been performed.

Article 9.     Liabilities for Breach of Contract: (1) If there is delay of
               payment by the Buyer over 7 workdays, then this Contract shall be
               terminated. (2) If either party fails to perform any of its
               obligations under this Contract, the breaching party shall pay
               the non-breaching party liquidated damages equal to 1% of the
               amount in issue per month and this Contract shall continue in
               effect. (3) If this Contract is rendered unable to be performed
               due to a breach by either party hereto, the breaching party shall
               be liable under the Contract Law of the People's Republic of
               China.

  *Confidential Treatment Requested. The redacted material has been separately
               filed with the Securities and Exchange Commission.

                                       2

<PAGE>

Article 10.    Any dispute in connection with the performance of this Contract
               shall be settled through negotiations between the parties hereto.
               If no settlement can be reached, the dispute shall be submitted
               for arbitration to the arbitration commission in the place where
               this Contract is signed.

Article 11.    Miscellaneous: This Contract shall become effective after being
               signed by and affixed with Companies' seals of the parties
               hereto. This Contract shall be executed in four originals, with
               each party to hold two. This Contract can be signed by fax.

Additional provisions: The Seller may not proceed with any shipment of silicon
wafers to the Buyer until after it has received the Buyer's testing and finished
product report with respect to the silicon wafers delivered in the previous
shipment.

<Table>
<Caption>
------------------------------------------------------------------------------------------------------------
                       The Seller                                               The Buyer
------------------------------------------------------------------------------------------------------------
<S>                                                         <C>
Name of the Company (seal): ReneSola Co., Ltd.              Name of the Company (seal): Jiangsu Linyang
                                                            Solarfun Co.,Ltd.

Address: Yaozhuang Zhen Industrial Park,                    Address: 666 Linyang Road, Qidong, Jiangsu
Jiashan County, Zhejiang Province                           Province

Legal Representative: (signature)                           Legal Representative: (signature)
Authorized Agent: (signature)                               Authorized Agent: (signature)
Tel: 0573-4773130
Fax: 0573-4773063                                           Tel: 0513-83115763
                                                            Fax: 0513-83307011

Bank Name: Industrial and Commercial Bank of China,         Bank Name: Bank of China, Qidong Branch,
Jiashan Branch                                              Business Department
Account No.: 1204070009242025955                            Account No.: 647032159808091001
Tax No.: 330421753019961                                    Tax No.: 320681765140726
Code: 314117                                                Zip Code: 226200
------------------------------------------------------------------------------------------------------------
</Table>

                                       3

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