Document:

<PAGE>
                                                                   Exhibit 10.20

                             (Summary Translation)
                      SILICON SUPPLY COOPERATION AGREEMENT

     Whereas, Jiangsu Linyang Solarfun Co., Ltd. (hereinafter referred to as
"Solarfun") has been striving to grow into an internationally recognized PV cell
manufacturer; and

     Whereas, Solarfun and Jiangxi LDK Solar Hi-Tech Co., Ltd. (hereinafter
referred to as "LDK") desire to establish a strategic partnership between them
to achieve a win-win result and mutual development on the principle of equality
and good faith and following the guideline of "Open, Timely and Dynamic
Adjustment".

     NOW, THEREFORE, after friendly negotiations, Solarfun and LDK hereby reach
the following agreement for the purchase and sale of multicrystalline silicon
wafers:

1.   In the case of shortage of multicrystalline silicon materials, LDK shall
     supply multicrystalline silicon wafers it manufactures to Solarfun to the
     maximum extent possible. While in the case of relative excess of the
     materials, Solarfun shall, on a priority basis, purchase and consume the
     multicrystalline silicon wafers manufactured by LDK at the price then
     prevailing at the international market.

2.   Based on the result of the cooperation between them during 2006 and in view
     of the development plan of LDK, Solarfun and LDK have agreed that from July
     1, 2007 to June 30, 2008 LDK shall supply Solarfun with the
     multicrystalline silicon wafers necessary for the production of 16,200,000
     pieces of multicrystalline silicon PV cells, including 15,000,000 pieces of
     multicrystalline silicon wafers at the specifications of 156x156, and
     1,200,000 pieces of multicrystalline silicon wafers at the specifications
     of 125x125. Such products shall be delivered to Solarfun by equal
     installments on a monthly-basis commencing from July 1, 2007.

3.   The actual price and thickness of the silicon wafers to be supplied
     hereunder shall be determined subject to further negotiations based on the
     actual market conditions and technology development at the relevant time.

4.   The specific terms for the cooperation contemplated hereunder shall be
     executed by the parties hereto subsequently as and when appropriate.

5.   This Agreement shall be executed in two (2) originals, with each Solarfun
     and LDK to hold one (1). This Agreement shall come into effect upon being
     affixed with the signature of the authorized signatory or the company seal
     of each Solarfun and LDK hereto.

                          [signature on the next page]

                                       1
<PAGE>

LDK:            JIANGXI LDK SOLAR HI-TECH CO., LTD. (affixed with LDK's company
                seal)

Signed by:  /s/ Zhu Liangbao

Dated:  November 14, 2006

SOLARFUN:       JIANGSU LINYANG SOLARFUN CO., LTD. (affixed with Solarfun's
                company seal)

Signed by:  /s/ Lu Yonghua (signature)

Dated:  November 14, 2006

                                       2<PAGE>
                                                                   Exhibit 10.21

                                    AGREEMENT

THIS AGREEMENT is made this 28th day of March, 2007 between:

Q-CELLS AG, a company organized and existing under the laws of the Federal
Republic of Germany, with its registered offices in Guardianstrasse 16, D-06766
Thalheim, Germany (hereinafter referred to as "Q-CELLS") legally represented by
Anton Milner, CEO and Hartmut Schuning, CFO- Chief Financial Officer,

                                       AND

LDK SOLAR HI-TECH CO., LTD., a company organized and existing under the
laws of P.R. China, with its registered offices in Hi-Tech Industrial
Park, Xinyu City, Jiangxi Province, P.R. China (hereinafter referred to as
"LDK") legally represented by Light DK Peng, CEO and Nick Sarno, Sr. Vice
President Manufacturing.

Q-CELLS and LDK are also hereinafter identified as "PARTY" or collectively as
"PARTIES".

                                    Preamble

(A)   LDK is the leading solar wafer manufacturer in Asia with its production
      facilities in Xinyhu in P.R. China. To meet the increasing demand for
      solar wafers, LDK is expanding its current installed solar wafer
      production capacities significantly. LDK is utilizing modern production
      technologies and aims at being a cost-effective producer or
      multicrystalline silicon solar wafers serving the global photovoltaic
      market.

(B)   Q-CELLS is the leading manufacturing of crystalline solar cells in Europe
      with its production facilities in Thalheim (Federal Republic of Germany).
      Q-CELLS will expand its production capacity and therefore needs to secure
      a stable, reliable and long lasting supply of multicrystalline silicon
      wafers.

(C)   The Parties enter into this AGREEMENT with the intention of developing a
      long-term partnership encompassing raw materials and wafer deliveries --
      in keeping with the terms of this AGREEMENT -- as well as other joint
      initiatives.

(D)   One objective of the Parties is the establishment of reduced thickness and
      material optimization. The cost and volume effective optimum will be
      evaluated by taking the overall costs and yields of both production
      processes into account.

<PAGE>

(E)   An intensive and mutually beneficial co-operation basis is foreseen where,
      for example, data exchange between both quality management systems will be
      used to optimize cell efficiency and breakage rate.

Now, therefore, the Parties do hereby agree as follows:

SECTION 1   OBJECT OF THE AGREEMENT

This Agreement ("AGREEMENT") determines the business cooperation between Q-Cells
and LDK in the years 2007 -- 2009.

SECTION 2   AGREEMENT VALIDITY

AGREEMENT shall become effective on the date first of signature and remain
binding between the Parties until 31st December 2009. It may thereafter be
extended and renewed if the Parties mutually decide and agree in writing.

SECTION 3   AGREEMENT FOR SILICON RAW MATERIALS

Q-Cells and LDK enter into an agreement for selling silicon raw materials by
Q-Cells to LDK to be further processed into wafers by LDK and for the supply to
Q-Cells. The terms of such agreement are as follows:

      Q-Cells shall provide raw materials in the amount of:

      2007: 15 metric tons of broken wafers (Q-Cells spec Poly-Br-NB1/2)

      2008: 200 metric tons solar grade feedstock (polysilicon or mono
      slabs or equivalent)

      2009: 200 metric tons solar grade feedback (polysilicon or mono
      slabs or equivalent)

      The volumes delivered in 2008 and 2009 shall be used by LDK for conversion
      into wafers with the silicon-to-wafer conversion ration of 28,000 wafers
      (calculation basis: 156x156mm, thickness 220mum) per metric ton. LDK will
      ship wafers out of feedstock (polysilicon, mono slabs or equivalent) back
      to Q-Cells within a period of 6 weeks after the arrival of the raw
      material at LDK, except for wafers out of broken wafers. In

                                       2
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      such a case of the wafer delivery time can be 8 weeks after the arrival of
      the raw material at LDK.

      The conversion rate may be increased due to yield improvement and wafer
      thickness reduction. The application conversion ratios for 2008 and 2009
      will be agreed upon by the Parties for a period of six months at a time
      (January -- June, July -- December), two (2) months in advance each
      period. In total this Agreement leads to the following annual wafer
      volumes (based on conversion ratio of 28,000 wafters per metric ton):

      5,600,000 Pieces Year 2008 (156mm x 156mm, 220mum and or 200mum)
      5,600,000 Pieces in Year 2009 (156mm x 156mm, 220mum and or 200mum)

      It is the intention of both Parties to also evaluate the supply of solar
      grade silicon (mg-SOG) from Q-Cells to LDK and the processing of this
      material by LDK. For this a mutual project shall be established. Based on
      the results of this project both Parties may on mutual agreement involved
      mg-SOG in the raw material supply from Q-Cells to LDK.

SECTION 4   SUPPLY AGREEMENT FOR MULTICRYSTALLINE WAFERS

4.1   In addition to the volumes mentioned in Section 3 Q-CELLS shall order and
      LDK shall deliver the following annual wafer quantities:

      6,000,000 Pieces in Year 2007 (156mm x 156mm, 220mum and or 200mum)
      18,400,000 Pieces in Year 2008 (156mm x 156mm, 220mum and or 200mum)
      24,400,000 Pieces in Year 2009 (156mm x 156mm, 220mum and or 200mum)

4.2   Q-CELLS has the option to shift to other wafer thickness; provided this
      wafer size or thickness is in the production program of LDK.

4.3   Any change in annual quantities will be subject to mutual AGREEMENT.
      However, Q-CELLS is obliged to purchase from LDK and LDK is obliged to
      sell to Q-Cells the quantity (expressed in numbers of wafers). The
      delivery schedule is detailed in APPENDIX 2.

4.4   During the entire period of validity of the AGREEMENT a continuous
      co-ordination on the wafer and raw material specifications and on the
      corresponding technical

                                       3
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      characteristics shall be assured. Therefore the Parties agree to have
      co-ordinating negotiations every six months. Therefore the Parties agree
      to have co-ordinating negotiations every six months. The co-ordinating
      negotiations shall take place alternately in Germany and in P.R. China. By
      mutual consent, the co-ordinating negotiations can take place at a third
      place.

4.5   LDK shall at all times ensure that a sufficient quantity of the wafers is
      manufactured to supply the need of Q-Cells within the annual quantities in
      accordance with agreed delivery plans as per 4.1

SECTION 5   PRICES

5.1   The prices for the raw materials and for the wafer shall be determined
      between Q-CELLS and LDK pursuant at this Section 5.

5.2   The agreed prices applicable to the shipments scheduled during the period
      from April 2007 until December 2007 (specified in APPENDIX 2) shall be as
      follows: Broken Wafers provided by Q-Cells to LDK pursuant to Section 3:
      [*] USD / kg Multi Wafer provided by LDK to Q-Cells pursuant to Section
      4: [*] Euro / pcs.

5.3   The Prices for deliveries in 2008 and 2009 shall be as follows:

      Feedstock (Solar Grade Polysilicon or Mono Slabs or equivalent) provided
      by Q-Cells to LDK pursuant to Section 3: [*] USD/kg

      Multi Wafer provided by LDK to Q-Cells pursuant to Section 3: [*] USD/pcs

      For multi Wafers pursuant to Section 4 the agreed price must be within the
      following ranges:

      2008: Maximum Price: [*] Euro, Minimum Price [*] Euro/pc

      2009: Maximum Price: [*] Euro, Minimum Price [*] Euro/pcs

      The prices for Multi Wafers provided by LDK to Q-Cells pursuant to Section
      3 and Section 4 will be agreed upon by the Parties for a period of six
      months at a time ("PRICING PERIOD"). The prices will be agreed two (2)
      months in advance of, and be valid for, the following Pricing Period
      ("PRICE DETERMINATION PERIOD"). Price changes will take into account the
      changes in market conditions for wafers and for multicrystalline solar
      cells, cost changes in feedback, cost improvements and effects related to
      EURO/Dollar exchange rates.

5.4   If the Parties have not been able to agree on new Wafer Prices for the
      following Pricing Period during the Price Determination Period, the last
      agreed Prices shall be deemed to be the Prices for the following 3 months.
      If in this period the Parties once again are not able to agree on the
      Prices according to paragraph 5.3, the AGREEMENT (Including all
      obligations as described in Section 3 and Section 4) may be terminated by
      one of the Parties with effect as of the end of the ongoing Pricing
      Period.

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

                                       4
<PAGE>

5.5   LDK shall submit an invoice to Q-CELLS for the Multi Wafers delivered to
      Q-CELLS. Q-CELLS shall submit an invoice to LDK for the Feedback
      (Polysilicon or Mono Slabs or equivalent and broken wafers) delivered to
      Q-CELLS.

SECTION 6   PAYMENT TERMS

6.1   For 2007 the payment terms for raw materials deliveries pursuant to
      Section 3 from Q-CELLS to LDK shall be as follows:

      100% has to be paid against shipping documents and packing list
      before shipment.

6.2   For 2007 the payment terms for wafer deliveries pursuant to Section 4 from
      LDK to Q-CELLS shall be as follows:

      Q-CELLS has to provide 40% Down-Payment of the whole supply volume for
      2007 pursuant to Section 4 (Down-payment volume = 15,120,000 - Euro),
      provided that LDK secures this payment with an Advance Payment Guarantee
      for Q3 and Q4, 2007 comparable to the template in APPENDIX 3.

      For each delivery the remaining 60% has to be paid against shipping
      documents and packing list before shipment.

6.3   Payment terms for all shipments in 2008 and 2009 have to be mutually
      agreed latest October of the year before.

SECTION 7   DELIVERY

7.1   The Multi Wafers pursuant to Section 3 and Section 4 shall be delivered
      FOB Shanghai, INCOTERMS 2000, in standard export packaging for wafers. The
      delivery clause present in the AGREEMENT shall be governed by the rules of
      INCOTERMS 2000 and its latest amendments.

7.2   The Raw Materials pursuant to Section 3 shall be delivered FOB Hamburg,
      INCOTERMS 2000, in standard export packaging for raw materials.

7.3   Each shipment must include a detailed packaging list, specifying the
      volume and other specifications according to mutual AGREEMENT.

SECTION 8   DELIVERY DATE

8.1   Delivery Date is specified in APPENDIX 2.

                                       5
<PAGE>

8.2   Late deliveries:

      If Q-CELLS is not able to fulfill its commitments to deliver raw materials
      as described in Section 3 and such delivery is delayed by more than two
      (2) weeks for reasons attributable to Q-CELLS, and this results in
      production disruptions and/or additional costs for LDK, LDK shall be
      entitled to claim a penalty and Q-CELLS shall pay LDK this penalty to be
      calculated on the delayed quantity of the agreed delivery. The penalty
      rate is described below.

<Table>
<Caption>
Delay                      Penalty on delayed quantity in
                           percent of agreed Sales price
<S>                        <C>
3rd week                   1.5%
4th week                   2.5%
5th week                   4.0%
</Table>

      If LDK is not able to fulfill its commitments to deliver wafers as
      described in Section 3, Section 4 and APPENDIX 2 and such delivery is
      delayed by more than two (2) weeks for reasons attributable to LDK,
      and this results in production disruptions and/or additional costs for
      Q-CELLS, Q-CELLS shall be entitled to claim a penalty and LDK shall pay
      Q-CELLS this penalty to be calculated on the delayed quantity of the
      agreed delivery. The penalty rate is described below.

<Table>
<Caption>
Delay                      Penalty on delayed quantity in
                           percent of agreed Sales price
<S>                        <C>
3rd week                   1.5%
4th week                   2.5%
5th week                   4.0%
</Table>

8.3   If one Party wish to raise a claim for penalty in accordance with the
      above clauses, the claim must be presented in writing to the other Party,
      no later than six (6) weeks after the penalty situation has occurred.
      Penalties shall be paid with two (2) months after the penalty claim has
      been presented.

SECTION 9   WARRANTY

9.1   LDK shall warrant that cell performance being produced out of LDK solar
      wafer should provide at least an average cell efficiency above 15.3%. The
      wafer quality

                                       6
<PAGE>

      and wafer specification are in conformity with the agreed Specifications
      attached hereto as APPENDIX 1 and must be fit to be used for the
      manufacture of solar cells.

9.2   In cases of defective delivery, Q-CELLS is entitled to the statutory
      claims to warranty and guarantees.

9.3   The expiration of the warranty period shall be 1 month after the arrival
      of the Wafers at Q-CELLS to the extend that the law does not provide for
      longer terms.

9.4   In case of defective delivery Q-CELLS shall, in writing, inform LDK of
      quantity and type of defect, and any other relevant information of the
      defective Wafer.

9.5   LDK shall be responsible for quality of the Wafers. If there are any
      problems relating to quality, including non-conformity to the
      specifications and any defect in the Wafers, LDK will immediately
      investigate the relevant matters including causes and shall at its
      responsibility replace defective wafers with good ones free of charge.

9.6   Neither Q-Cells nor LDK shall be liable for any incidental or
      consequential damages, nor any loss of production time and / or material
      due to defects of the delivered raw material or Wafers.

9.7   LDK shall replace delivered Multi Wafer within two weeks due to
      lower wafer volumes based on indication of invoice/ packing list
      above 0.05%, all breakage in the box above 0.3% of the total
      delivered wafer quantity and shall also replace wafer breakage rate
      in the Q-CELLS line exceeding 3.5%. Moreover, the total amount of
      shunted cell should not exceed the average of Q-CELLS by more than
      5%.

SECTION 10  HARDSHIP

If, during the period of the AGREEMENT, performance of the AGREEMENT should lead
to unreasonable hardship for one or other Party - taking the interests of all
Parties into account - all Parties shall endeavor to agree amicably to amend the
AGREEMENT in the light of the change in circumstances.

This shall also apply if the market price for silicon wafers differs by more
than 10 % from the price range indicated in Section 5.3.

SECTION 11  FORCE MAJEURE

Q-CELLS and LDK shall not be liable for any failures due to Force Majeure, i.e.,
any cause beyond reasonable control of the Parties or circumstances of an
exceptional and/or unforeseeable nature that may prevent, either in whole or
part, the implementation of the AGREEMENT. By way of example, but not by way of
limitation, the causes of Force Majeure could be: war, civil disturbance, fire,
floods, earthquakes and any other natural event of an exceptional nature,
strike, severe delays or disruption in the production process of either Party
due to external factors, and hindrances due to administrative or legislative
acts. When cases of Force Majeure, as per this present Section 11, arise they
must immediately be reported to the other Party and duly documented. In any
case, events of Force Majeure must always be reported to the other Party in
writing together with appropriate documentary evidence within 15 days of the
occurrence of the event. If the Force Majeure event continues beyond 30 days,
then the Parties shall meet to agree on how to proceed or on whether to suspend
or cancel the AGREEMENT.

                                       7
<PAGE>

SECTION 12  CONFIDENTIALITY

During the term of the AGREEMENT and at any time thereafter, the Parties agree
to keep secret and not to reveal to third Parties the terms of the AGREEMENT and
any information relating to the feedstock (poly silicon, broken wafer and mono
slabs and equivalent) supply and Multi Wafer deliveries. This shall not apply to
the disclosure of information required by law including stock exchange
regulations or vis-a-vis financial advisors and institutions within the normal
financing activities of the Parties and then only under confidential banking
relationships or with non-disclosure or secrecy AGREEMENT's.

SECTION 13  FISCAL OBLIGATIONS

Each Party is responsible for its own fiscal obligations.

SECTION 14  APPLICABLE LAW

The AGREEMENT shall be governed by the laws of the Federal Republic of Germany,
with jurisdiction in Berlin. This AGREEMENT shall not include, incorporate or be
subject to the provisions of the "United Nations Convention on AGREEMENTs for
the International Sales of Goods of 1980".

SECTION 15  COMMUNICATIONS

All communications relating to the AGREEMENT shall be considered valid when made
in writing and sent via registered mail, telegram, telex or telefax, and
provided that they are addressed as follows:

      -     JIANGXI LDK Solar HI-Tech Co., Ltd., Attention Mr. Nick
            Sarno, Hi-Tech Industrial Park, Xinyu, Jiangxi, P.R.C. JIANGI LDK
            SOLAR HI-TECH CO., LTD.; Email: nick@ldksolar.co

                                       8
<PAGE>

            Telephone: + 86 790-6860095
            Telefax  : + 86 790-6860085

      -     Q-Cells AG, Attention Mr. Dirk Junghans, Guardianstrasse 16,
            D-06766 Thalheim - Germany; Email: d.junghans@q-cells.com

            Telephone: + 49 3494668740
            Telefax  : + 49 3494668764

Possible changes of address must be communicated in writing and shall be
effective only after their receipt.

SECTION 16  DISPUTES

16.1  All disputes arising from this AGREEMENT, including those related to its
      validity, interpretation, implementation and cancellation, shall be
      settled by binding arbitration by three arbiters according to the rules
      and regulations of the Sections 1025 to 1066 of the German Code of Civil
      Procedure. The arbitration according to such rules shall be conducted in
      the English language in Berlin.

16.2  If one Party fails to show up at the appointed time and place, without a
      valid excuse previously made, the arbitration will continue as if the
      Party was present, and the arbitration shall be binding upon such Party.

SECTION 17  INVALIDITY

Should any clause of this AGREEMENT be or become invalid in whole or in part,
this shall not affect the validity of the remaining clauses or of the remaining
part of the clause concerned. The Parties shall endeavour to replace any such
invalid arrangement by a valid one which as far as possible, is in line with the
economic purpose of the invalid arrangement. Failure to agree on a replacement
clause shall not make the AGREEMENT invalid as a whole, unless it can reasonably
be assumed that the AGREEMENT would not have been concluded at all without the
invalid clause.

SECTION 18  MODIFICATIONS OF THE AGREEMENT

All modifications relating to the AGREEMENT shall be considered valid only when
made in writing. Every previous AGREEMENT between the Parties shall be
considered invalid and shall be entirely replaced by the AGREEMENT.

                                       9
<PAGE>

SECTION 19  STANDARD BUSINESS CONDITIONS

The Parties hereby exclude their standard business conditions.

This AGREEMENT has been prepared in two originals, one for Q-CELLS and one for
LDK.

For Q-Cells AG                          For LDK

/s/ Anton Milner                        /s/ Xiaofeng Peng
------------------------------------    ---------------------------------------
Name: Anton Milner                      Name: Light DK Peng
Title: CEO                              Title: CEO
Date: 28 March 2007                     Date: 28 March 2007

/s/ Hartmut Schuning                    /s/ Nick Sarno
------------------------------------    ---------------------------------------
Name: Hartmut Schuning                  Name: Nick Sarno
Title: CFO (Chief Financial Officer)    Title: Sr. Vice President Manufacturing
Date: 28 March 2007                     Date: 28 March 2007

                                       10
<PAGE>

ATTACHMENTS:

1)  Appendix 1:  Product Specifications for Multi Wafers

2)  Appendix 2:  Delivery Program

3)  Appendix 3:  Template for Advance Payment Guarantee

                                       11
<PAGE>
APPENDIX 1 -- PRODUCT SPECIFICATIONS AND QUALITY CONTROL

PARAMETER                               WAFER

GENERAL

Crystal type                            Multicrystalline
Dopant                                  Boron

ELECTRICAL CHARACTERISTICS

Resistivity                             0.5 -- 3.0 omega.cm
Lifetime                                > 2 mus

CHEMICAL CHARACTERISTICS

Carbon content                          < 4 x 10(17) cm(-3)
Oxygen content                          < 1 x 10(18) cm(-3)

DIMENSIONS

Wafer square side                       156 x 156 +/- 0.5 mm
Wafer thickness                         220 mum +/- 20 mum or 200 mum +/- 20 mum
Square sides angle                      90o +/- 0.3o
Bevel edge width                        1.0 -- 2.0 mm
Bevel edge angle                        45o +/- 25o
TTV                                     < 50 mum
Bow                                     < 60 mum
Saw grooves                             < 20 mum
Edge defect                             not allowed
Micro cracks                            not allowed

MISCELLANEOUS

Wafer surface                           as cut and cleaned
Contamination                           no dirt/oil stains, remain of soap/glue

                                       12
<PAGE>
APPENDIX 2 -- DELIVERY PROGRAM 2007-04-29

WAFER DELIVERIES

<Table>
<Caption>
PERIOD OF SHIPMENT            DELIVERY THALHEIM               QUANTITY OF WAFERS
<S>                        <C>                                <C>
April 2007                 Last week of April 2007                 200,000
May 2007                    Last week of May 2007                  400,000
June 2007                   Last week of June 2007                 600,000
July 2007                   Last week of July 2007                 700,000
August 2007                Last week of August 2007                750,000
September 2007              Last week of September                 800,000
October 2007                 Last week of October 2007             800,000
November 2007               Last week of November                  850,000
December 2007               Last week of December                  900,000
</Table>

For 2008 and 2009 the delivery schedule has to be mutually agreed latest October
of the year before.

RAW MATERIALS DELIVERIES

<Table>
<Caption>
PERIOD OF SHIPMENT              DELIVERY XINYU         MATERIAL DESCRIPTION
                                                      AND AMOUNT IN [METRIC TONS]
<S>                       <C>                         <C>
April 2007                  1st week of April 2007      5 mt Broken Wafer
June 2007                   1st week of June 2007       5 mt Broken Wafer
November 2007             1st week of November 2007     5 mt Broken Wafer
</Table>

For 2008 and 2009 the deliver schedule has to be mutually agreed latest October
of the year before.

                                       13
<PAGE>
APPENDIX 3 -- TEMPLATE FOR ADVANCE PAYMENT GUARANTEE

Order by tested telex/authenticated swift
from: ... (seller's bank)
to:   HYVEDEMM300
      Bayerische Hypo- und Vereinsbank AG, ...

Our counterguarantee no. ... for EUR ... (amount)

Please issue by our order and under our counterindemnity no. ..... an
advance payment guarantee for ... (amount) (in words:...), favour Q-Cells
AG, Guardianstr. 16, D-06766 Thalheim, Germany, for account of .. "Seller
of Wafer" . (mandator's name + address), valid from ... until ...,
concerning tender/off no. ... / contract no. ... / the delivery of ... /
the project ...  .

Please issue the guarantee according to the following wording:
Quote
to
Q-Cells AG
Guardianstr. 16
D-06766 Thalheim
Germany

Advance Payment guarantee no. ... for ...

Dear Sir or Madam,

We are informed that on ... you signed the contract no. ... with Messrs.
.... (hereinafter "Seller") for the supply of ... with a total contract
value of ...

Under the terms of this contract, the Seller will receive an advance payment in
the amount of ... equal to ... % of the total contract value upon presentation
of a bank guarantee in your favour securing the eventual obligation of the
Seller to refund the advance payment.

At the Seller's request, we, ... Bayerische Hypo- und Vereinsbank AG..., hereby
issue this guarantee and irrevocably undertake to pay to you any amount up to a
maximum of ... (in words: ...)

upon your first written demand by original letter.

                                       14
<PAGE>

This guarantee expires when this guarantee document has been returned to us. The
original of this guarantee document has to be returned to us after expiry or
settlement of all claims under this guarantee.

The rights arising from this guarantee may not be assigned without our written
consent.

This guarantee is subject to German law. Place of jurisdiction is Munich.

The fees and expenses charged by our bank are for the Seller's account. All
other costs are to be borne by you.

Yours sincerely,

Bayerische Hypo-und Vereinbank AG
....
Unquote

We, ... (seller's bank, name + address)....., hereby irrevocably undertake to
pay to you on receipt of your first written demand stating that you have been
called upon to effect payment under your guarantee issued in conformity with the
above-mentioned conditions, the amount claimed by you up to a maximum of

....(amount)
(in words:...).

Our counterindemnity will become effective upon issuance of your guarantee and
will cease to be valid upon your releasing us from our liability, at the latest,
however, on .................... Any claim hereunder must have reached us by
letter, authenticated SWIFT or tested telex before the closing hours of that
day.

We confirm that our counterguarantee is issued in accordance with foreign
currency regulations valid in our country and in case of implementation payment
will be made in effective USD/EUR without delay and without any deductions or
any set-off, counterclaim or any other charges and free of any tax, impost, levy
or duty present or future of whatsoever nature.

All commissions and charges arising in connection with the issuance of the
above-mentioned guarantee will be borne by us.

Please deliver your letter of guarantee to ... and let us have a copy of it.

This message is the operative instrument, no mail confirmation will follow.

.... (seller's bank)

                                       15

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