Letter of Transmittal

THE OFFER, PRORATION PERIOD AND WITHDRAWAL RIGHTS EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY TIME, ON TUESDAY, MAY 31, 2011, UNLESS THE OFFER IS EXTENDED.

DELIVERY OF THIS LETTER OF TRANSMITTAL TO AN ADDRESS OTHER THAN AS SET FORTH ABOVE OR TRANSMISSION OF INSTRUCTIONS VIA FACSIMILE TO A NUMBER OTHER THAN AS SET FORTH ABOVE WILL NOT CONSTITUTE A VALID DELIVERY. YOU MUST SIGN THIS LETTER OF TRANSMITTAL WHERE INDICATED BELOW AND COMPLETE EITHER THE SUBSTITUTE FORM W-9 ACCOMPANYING THIS LETTER OF TRANSMITTAL OR AN APPLICABLE FORM W-8. SEE INSTRUCTION 9 BELOW.

PLEASE READ THE INSTRUCTIONS ACCOMPANYING THIS LETTER OF TRANSMITTAL CAREFULLY BEFORE COMPLETING THIS LETTER OF TRANSMITTAL.

IF YOU WOULD LIKE ADDITIONAL COPIES OF THIS LETTER OF TRANSMITTAL OR ANY OF THE OTHER OFFERING DOCUMENTS, YOU SHOULD CONTACT THE INFORMATION AGENT, MACKENZIE PARTNERS, INC., AT (212) 929-5500 (CALL COLLECT) or (800) 322-2885 (TOLL FREE) OR THE DEALER MANAGER, CREDIT SUISSE SECURITIES (USA) LLC, AT (212) 538-4581 OR (800) 318-8219 (TOLL FREE).

You have received this Letter of Transmittal in connection with the offer by Total Gas & Power USA, SAS, a société par actions simplifiée organized under the laws of the Republic of France (“Purchaser”), to purchase shares of Class A Common Stock, par value $0.001 per share, of SunPower Corporation, a Delaware corporation (“SunPower”), together with the associated preferred stock purchase rights issued in connection with and subject to the Rights Agreement, as amended (the “Rights Agreement”), dated as of August 12, 2008, by and between SunPower and Computershare Trust Company, N.A. (the “Class A Shares”), and shares of Class B Common Stock, par value $0.001 per share, of SunPower, together with the associated preferred stock purchase rights issued in connection with and subject to the Rights Agreement, (the “Class B Shares” and together with the Class A Shares, the “Shares”), for $23.25 per Share, net to the holder thereof in cash (the “Offer Price”), without interest and less applicable withholding taxes, upon the terms and subject to the conditions set forth in the Offer to Purchase dated May 3, 2011 (as amended, supplemented or otherwise modified from time to time, the “Offer to Purchase”) and this related Letter of Transmittal (as amended, supplemented or otherwise modified from time to time, the “Letter of Transmittal”), which collectively constitute the “Offer.”

You should use this Letter of Transmittal to deliver to the Depositary your Shares that are represented by stock certificates. If you are delivering your Shares by book-entry transfer to an account maintained by the Depositary at The Depository Trust Company (“DTC”), you may use this Letter of Transmittal or you may use an Agent’s Message (as defined in Instruction 2 below). In this document, stockholders who deliver certificates representing their Shares are referred to as “Certificate Stockholders.” Stockholders who deliver their Shares through book-entry transfer are referred to as “Book-Entry Stockholders.”

If certificates for your Shares are not immediately available or you cannot deliver your certificates and all other required documents to the Depositary on or prior to the Expiration Date (as defined in Section 1 of the Offer to Purchase), or you cannot comply with the book-entry transfer procedures on a timely basis, you may nevertheless tender your Shares according to the guaranteed delivery procedures set forth in Section 3 of the Offer to Purchase. See Instruction 2. Delivery of documents to DTC will not constitute delivery to the Depositary.

NOTE: SIGNATURES MUST BE PROVIDED BELOW PLEASE READ THE ACCOMPANYING INSTRUCTIONS CAREFULLY

The undersigned hereby tenders to Total Gas & Power USA, SAS, a société par actions simplifiée organized under the laws of the Republic of France (“Purchaser”), an indirect wholly owned subsidiary of Total S.A., a société anonyme organized under the laws of the Republic of France (“Total”), the above-described shares, if any, of Class A Common Stock, par value $0.001 per share, of SunPower, a Delaware corporation (“SunPower”), together with the associated preferred stock purchase rights issued in connection with and subject to the Rights Agreement (the “Rights Agreement”), dated as of August 12, 2008, by and between SunPower and Computershare Trust Company, N.A. (the “Class A Shares”), and shares, if any, of Class B Common Stock, par value $0.001 per share, of SunPower, together with the associated preferred stock purchase rights issued in connection with and subject to the Rights Agreement, (the “Class B Shares” and together with the Class A Shares, the “Shares”), pursuant to the offer by Purchaser to purchase Class A Shares and Class B Shares for $23.25 per Share, net to the holder thereof in cash (the “Offer Price”), without interest and less applicable withholding taxes, upon the terms and subject to the conditions set forth in the Offer to Purchase dated May 3, 2011 (as amended, supplemented or otherwise modified from time to time, the “Offer to Purchase”) and this related Letter of Transmittal (as amended, supplemented or otherwise modified from time to time, the “Letter of Transmittal”), which collectively constitute the “Offer.” The undersigned understands that Purchaser reserves the right to transfer or assign, from time to time, in whole or in part, to one or more of its affiliates, the right to purchase the Shares tendered herewith.

The undersigned acknowledges that the Offer is being made pursuant to the Tender Offer Agreement, dated as of April 28, 2011 (as amended, supplemented or otherwise modified from time to time, the “Tender Offer Agreement”), between Purchaser and SunPower.

On the terms and subject to the conditions of the Offer (including, if the Offer is extended or amended in accordance with the terms of the Tender Offer Agreement, the terms and conditions of such extension or amendment), subject to, and effective upon, acceptance for payment and payment for the Shares validly tendered herewith in accordance with the terms of the Offer, the undersigned hereby sells, assigns and transfers to, or upon the order of, Purchaser, all right, title and interest in and to all of the Shares being tendered hereby and any and all cash dividends, distributions, rights, other Shares or other securities issued or issuable in respect of such Shares on or after the Expiration Date (as defined in Section 1 of the Offer to Purchase) (collectively, “Distributions”). In addition, the undersigned hereby irrevocably appoints Computershare Trust Company, N.A. (the “Depositary”) the true and lawful agent and attorney-in-fact and proxy of the undersigned with respect to such Shares and any Distributions with full power of substitution (such power of attorney being deemed to be an irrevocable power coupled with an interest) to the fullest extent of such stockholder’s rights with respect to such Shares and any Distributions (i) to deliver certificates representing Shares (the “Share Certificates”) and any Distributions, or transfer of ownership of such Shares and any Distributions on the account books maintained by The Depository Trust Company (“DTC”), together, in either such case, with all accompanying evidence of transfer and authenticity, to or upon the order of Purchaser, (ii) to present such Shares and any Distributions for transfer on the books of SunPower, and (iii) to receive all benefits and otherwise exercise all rights of beneficial ownership of such Shares and any Distributions, all in accordance with the terms and subject to the conditions of the Offer.

The undersigned hereby irrevocably appoints each of the designees of Purchaser the attorneys-in-fact and proxies of the undersigned, each with full power of substitution, to the full extent of such stockholder’s rights with respect to the Shares tendered hereby which have been accepted for payment and with respect to any Distributions. The designees of Purchaser will, with respect to the Shares and any associated Distributions for which the appointment is effective, be empowered to exercise all voting and any other rights of such stockholder, as they, in their sole discretion, may deem proper at any annual, special, adjourned or postponed meeting of SunPower’s stockholders, by written consent in lieu of any such meeting or otherwise. This proxy and power of attorney shall be irrevocable and coupled with an interest in the tendered Shares. Such appointment is effective when, and only to the extent that, Purchaser accepts the Shares tendered with this Letter of Transmittal for

payment pursuant to the Offer. Upon the effectiveness of such appointment, without further action, all prior powers of attorney, proxies and consents given by the undersigned with respect to such Shares and any associated Distributions will be revoked and no subsequent powers of attorney, proxies, consents or revocations may be given (and, if given, will not be deemed effective). Purchaser reserves the right to require that, in order for Shares to be deemed validly tendered, immediately upon Purchaser’s acceptance for payment of such Shares, Purchaser must be able to exercise full voting, consent and other rights, to the extent permitted under applicable law, with respect to such Shares and any associated Distributions, including voting at any meeting of stockholders or executing a written consent concerning any matter.

The undersigned hereby represents and warrants that the undersigned has full power and authority to tender, sell, assign and transfer the Shares and any Distributions tendered hereby and, when the same are accepted for payment by Purchaser, Purchaser will acquire good, marketable and unencumbered title thereto, free and clear of all liens, restrictions, charges and encumbrances and the same will not be subject to any adverse claim. The undersigned hereby represents and warrants that the undersigned is the registered owner of the Shares or the Share Certificate(s) have been endorsed to the undersigned in blank or the undersigned is a participant in DTC whose name appears on a security position listing participant as the owner of the Shares. The undersigned will, upon request, execute and deliver any additional documents deemed by the Depositary or Purchaser to be necessary or desirable to complete the sale, assignment and transfer of the Shares and any Distributions tendered hereby. In addition, the undersigned shall promptly remit and transfer to the Depositary for the account of Purchaser any and all Distributions in respect of the Shares tendered hereby, accompanied by appropriate documentation of transfer and, pending such remittance or appropriate assurance thereof, Purchaser shall be entitled to all rights and privileges as owner of any such Distributions and may withhold the entire purchase price or deduct from the purchase price the amount or value thereof, as determined by Purchaser in its sole discretion.

It is understood that the undersigned will not receive payment for the Shares unless and until the Shares are accepted for payment and until the Share Certificate(s) owned by the undersigned are received by the Depositary at the address set forth above, together with such additional documents as the Depositary may require, or, in the case of Shares held in book-entry form, ownership of Shares is validly transferred on the account books maintained by DTC, and until the same are processed for payment by the Depositary. It is understood that the method of delivery of the Shares, the Share Certificate(s) and all other required documents (including delivery through DTC) is at the option and risk of the undersigned and that the risk of loss of such Shares, Share Certificate(s) and other documents shall pass only after the Depositary has actually received the Shares or Share Certificate(s) (including, in the case of a book-entry transfer, by Book-Entry Confirmation (as defined below)).

It is a violation of Rule 14e-4 promulgated under the Securities Exchange Act of 1934, as amended, for a person acting alone or in concert with others, directly or indirectly, to tender shares for such person’s own account unless at the time of tender and at the expiration date such person has a “net long position” in (a) the shares that is equal to or greater than the amount tendered and will deliver or cause to be delivered such shares for the purpose of tender to Purchaser within the period specified in the Offer, or (b) other securities immediately convertible into, exercisable for or exchangeable into shares (“Equivalent Securities”) that is equal to or greater than the amount tendered and, upon the acceptance of such tender, will acquire such shares by conversion, exchange or exercise of such Equivalent Securities to the extent required by the terms of the Offer and will deliver or cause to be delivered such shares so acquired for the purpose of tender to Purchaser within the period specified in the Offer. Rule 14e-4 also provides a similar restriction applicable to the tender or guarantee of a tender on behalf of another person. A tender of shares made pursuant to any method of delivery set forth in this Letter of Transmittal will constitute the undersigned’s representation and warranty to Purchaser that (a) the undersigned has a “net long position” in shares or Equivalent Securities being tendered within the meaning of Rule 14e-4, and (b) such tender of shares complies with Rule 14e-4.

The undersigned understands that in the event the Offer is oversubscribed, Shares tendered will be subject to proration upon the terms and subject to the conditions of the Offer, and, accordingly, Purchaser may not purchase all Shares tendered by the undersigned.

All authority conferred or agreed to be conferred pursuant to this Letter of Transmittal shall not be affected by, and shall survive, the death or incapacity of the undersigned and any obligation of the undersigned hereunder shall be binding upon the heirs, executors, administrators, trustees in bankruptcy, personal representatives, successors and assigns of the undersigned. Except as stated in the Offer to Purchase, this tender is irrevocable.

The undersigned understands that the acceptance for payment by Purchaser of Shares tendered pursuant to one of the procedures described in Section 3 of the Offer to Purchase will constitute a binding agreement between the undersigned and Purchaser upon the terms and subject to the conditions of the Offer.

Unless otherwise indicated herein under “Special Payment Instructions,” please issue the check for the purchase price in the name(s) of, and/or return any Share Certificates representing Shares not tendered or accepted for payment to, the registered owner(s) appearing under “Description of Shares Tendered.” Similarly, unless otherwise indicated under “Special Delivery Instructions,” please mail the check for the purchase price and/or return any Share Certificates representing Shares not tendered or accepted for payment (and accompanying documents, as appropriate) to the address(es) of the registered owner(s) appearing under “Description of Shares Tendered.” In the event that both the Special Delivery Instructions and the Special Payment Instructions are completed, please issue the check for the purchase price and/or issue any Share Certificates representing Shares not tendered or accepted for payment (and any accompanying documents, as appropriate) in the name of, and deliver such check and/or return such Share Certificates (and any accompanying documents, as appropriate) to, the person or persons so indicated. Unless otherwise indicated herein in the box titled “Special Payment Instructions,” please credit any Shares tendered hereby or by an Agent’s Message and delivered by book-entry transfer, but which are not purchased, by crediting the account at DTC designated above. The undersigned recognizes that Purchaser has no obligation pursuant to the Special Payment Instructions to transfer any Shares from the name of the registered owner thereof if Purchaser does not accept for payment any of the Shares so tendered.

SPECIAL PAYMENT INSTRUCTIONS

(See Instructions 1, 5, 6 and 7)

To be completed ONLY if Share Certificate(s) not tendered or not accepted for payment and/or the check for the purchase price of Shares accepted for payment are to be issued in the name of someone other than the undersigned or if Shares tendered by book-entry transfer which are not accepted for payment are to be returned by credit to an account maintained at DTC other than that designated above.

Issue: ¨ Check and/or ¨ Share Certificates to:


Name:
(Please Print)

Address:


(Include Zip Code)


(Taxpayer Identification or Social Security Number) (See Substitute Form W-9 included in this Letter of Transmittal)

SPECIAL DELIVERY INSTRUCTIONS

(See Instructions 1, 5, 6 and 7)

To be completed ONLY if Share Certificate(s) not tendered or not accepted for payment and/or the check for the purchase price of Shares accepted for payment are to be sent to someone other than the undersigned or to the undersigned at an address other than that shown in the box titled “Description of Shares Tendered” above.

Deliver: ¨ Check and/or ¨ Share Certificates to:


Name:
(Please Print)

Address:


(Include Zip Code)

1. Guarantee of Signatures. Except as otherwise provided below, all signatures on this Letter of Transmittal must be guaranteed by a financial institution (including most commercial banks, savings and loan associations and brokerage houses) that is a member in good standing of a recognized Medallion Program approved by the Securities Transfer Association, Inc., including the Security Transfer Agents Medallion Program, the New York Stock Exchange Medallion Signature Program and the Stock Exchanges Medallion Program (each, an “Eligible Institution”). Signatures on this Letter of Transmittal need not be guaranteed (a) if this Letter of Transmittal is signed by the registered owner(s) (which term, for purposes of this document, includes any participant in DTC whose name appears on a security position listing as the owner of the Shares) of Shares tendered herewith and such registered owner has not completed the box titled “Special Payment Instructions” or the box titled “Special Delivery Instructions” on this Letter of Transmittal or (b) if such Shares are tendered for the account of an Eligible Institution. See Instruction 5.

2. Delivery of Letter of Transmittal and Certificates or Book-Entry Confirmations. This Letter of Transmittal is to be completed by stockholders either if Share Certificates are to be forwarded herewith or, unless an Agent’s Message is utilized, if tenders are to be made pursuant to the procedures for tender by book-entry transfer set forth in Section 3 of the Offer to Purchase. A manually executed facsimile of this document may be used in lieu of the original. Share Certificates representing all physically tendered Shares, or confirmation of any book-entry transfer into the Depositary’s account at DTC of Shares tendered by book-entry transfer (“Book Entry Confirmation”), as well as this Letter of Transmittal properly completed and duly executed with any required signature guarantees, unless an Agent’s Message in the case of a book-entry transfer is utilized, and any other documents required by this Letter of Transmittal, must be received by the Depositary at one of its addresses set forth herein on or prior to the Expiration Date (as defined in Section 1 of the Offer to Purchase). Please do not send your Share Certificates directly to Total, Purchaser or SunPower.

Stockholders whose Share Certificates are not immediately available or who cannot deliver all other required documents to the Depositary on or prior to the Expiration Date or who cannot comply with the procedures for book-entry transfer on a timely basis, may nevertheless tender their Shares by properly completing and duly executing a Notice of Guaranteed Delivery pursuant to the guaranteed delivery procedure set forth in Section 3 of the Offer to Purchase. Pursuant to such procedure: (i) such tender must be made by or through an Eligible Institution, (ii) a properly completed and duly executed Notice of Guaranteed Delivery substantially in the form provided by Purchaser must be received by the Depositary prior to the Expiration Date, and (iii) Share Certificates representing all tendered Shares, in proper form for transfer (or a Book Entry Confirmation with respect to such Shares), as well as a Letter of Transmittal, properly completed and duly executed with any required signature guarantees (unless, in the case of a book-entry transfer, an Agent’s Message is utilized), and all other documents required by this Letter of Transmittal, must be received by the Depositary within three trading days of The NASDAQ Stock Market after the date of execution of such Notice of Guaranteed Delivery.

A properly completed and duly executed Letter of Transmittal must accompany each such delivery of Share Certificates to the Depositary.

The term “Agent’s Message” means a message, transmitted by DTC to, and received by, the Depositary and forming part of a Book-Entry Confirmation, which states that DTC has received an express acknowledgment from the participant in DTC tendering the Shares which are the subject of such Book-Entry Confirmation that such participant has received and agrees to be bound by the terms of the Letter of Transmittal and that Purchaser may enforce such agreement against the participant.

THE METHOD OF DELIVERY OF THE SHARES, THIS LETTER OF TRANSMITTAL AND ALL OTHER REQUIRED DOCUMENTS, INCLUDING DELIVERY THROUGH DTC, IS AT THE ELECTION AND RISK OF THE TENDERING STOCKHOLDER. DELIVERY OF ALL SUCH DOCUMENTS WILL BE DEEMED MADE AND RISK OF LOSS OF THE SHARE CERTIFICATES SHALL PASS ONLY WHEN ACTUALLY RECEIVED BY THE DEPOSITARY (INCLUDING, IN THE CASE OF A BOOK-ENTRY TRANSFER, BY BOOK-ENTRY CONFIRMATION). IF SUCH DELIVERY IS BY MAIL, IT IS RECOMMENDED THAT ALL SUCH DOCUMENTS BE SENT BY PROPERLY INSURED REGISTERED MAIL WITH RETURN RECEIPT REQUESTED. IN ALL CASES, SUFFICIENT TIME SHOULD BE ALLOWED TO ENSURE TIMELY DELIVERY.

No alternative, conditional or contingent tenders will be accepted and no fractional Shares will be purchased. All tendering stockholders, by execution of this Letter of Transmittal, waive any right to receive any notice of the acceptance of their Shares for payment.

All questions as to validity, form and eligibility of the surrender of any Share Certificate hereunder will be determined by Purchaser (which may delegate power in whole or in part to the Depositary) in its sole discretion. Purchaser reserves the right to waive any irregularities or defects in the surrender of any Shares or Share Certificate(s). Surrender will not be deemed to have been made until all irregularities have been cured or waived. Purchaser and the Depositary shall make reasonable efforts to notify any person of any defect in any Letter of Transmittal submitted to the Depositary.

3. Inadequate Space. If the space provided herein is inadequate, the certificate numbers and/or the number of Shares should be listed on a separate schedule attached hereto and separately signed on each page thereof in the same manner as this Letter of Transmittal is signed.

4. Partial Tenders (Applicable to Certificate Stockholders Only). If fewer than all the Shares evidenced by any Share Certificate delivered to the Depositary are to be tendered, fill in the number of Shares which are to be tendered in the column titled “Number of Shares Tendered” in the box titled “Description of Shares Tendered.” In such cases, new certificate(s) for the remainder of the Shares that were evidenced by the old certificate(s) but not tendered will be sent to the registered owner, unless otherwise provided in the appropriate box on this Letter of Transmittal, as soon as practicable after the Expiration Date. All Shares represented by Share Certificates delivered to the Depositary will be deemed to have been tendered unless otherwise indicated.

5. Signatures on Letter of Transmittal; Stock Powers and Endorsements. If this Letter of Transmittal is signed by the registered owner(s) of the Shares tendered hereby, the signature(s) must correspond with the name(s) as written on the face of the Share Certificate(s) without alteration or any other change whatsoever.

If any Shares tendered hereby are owned of record by two or more joint owners, all such owners must sign this Letter of Transmittal.

If any tendered Shares are registered in the names of different holder(s), it will be necessary to complete, sign and submit as many separate Letters of Transmittal as there are different registrations of such Shares.

If this Letter of Transmittal or any certificates or stock powers are signed by trustees, executors, administrators, guardians, attorneys-in-fact, officers of corporations or others acting in a fiduciary or representative capacity, such persons should so indicate when signing, and proper evidence satisfactory to Purchaser of their authority so to act must be submitted.

If this Letter of Transmittal is signed by the registered owner(s) of the Shares listed and transmitted hereby, no endorsements of Share Certificates or separate stock powers are required unless payment is to be made to, or Share Certificates representing Shares not tendered or accepted for payment are to be issued in the name of, a

person other than the registered owner(s). Signatures on such Share Certificates or stock powers must be guaranteed by an Eligible Institution.

If this Letter of Transmittal is signed by a person other than the registered owner(s) of the Share(s) listed, the Share Certificate(s) must be endorsed or accompanied by the appropriate stock powers, in either case, signed exactly as the name or names of the registered owner(s) or holder(s) appear(s) on the Share Certificate(s). Signatures on such Share Certificates or stock powers must be guaranteed by an Eligible Institution.

6. Transfer Taxes. Purchaser will pay any transfer taxes with respect to the transfer and sale of Shares to it or to its order pursuant to the Offer, except as otherwise provided in this Instruction 6. If, however, payment of the purchase price is to be made to, or (in the circumstances permitted hereby) if Share Certificates not tendered or accepted for payment are to be registered in the name of, any person other than the registered owner(s), or if tendered Share Certificates are registered in the name of any person other than the person signing this Letter of Transmittal, the amount of any transfer taxes (whether imposed on the registered owner(s) or such other person) payable on account of the transfer to such other person will be deducted from the purchase price unless satisfactory evidence of the payment of such taxes, or exemption therefrom, is submitted.

7. Special Payment and Delivery Instructions. If a check is to be issued in the name of, and/or Share Certificates representing Shares not tendered or accepted for payment are to be issued or returned to, a person other than the signer(s) of this Letter of Transmittal or if a check and/or such certificates are to be mailed to a person other than the signer(s) of this Letter of Transmittal or to an address other than that shown in the box titled “Description of Shares Tendered” above, the appropriate boxes on this Letter of Transmittal should be completed. Stockholders delivering Shares tendered hereby or by Agent’s Message by book-entry transfer may request that Shares not purchased be credited to an account maintained at DTC as such stockholder may designate in the box titled “Special Payment Instructions” herein. If no such instructions are given, all such Shares not purchased will be returned by crediting the same account at DTC as the account from which such Shares were delivered.

8. Requests for Assistance or Additional Copies. Questions or requests for assistance may be directed to the Information Agent or the Dealer Manager at their respective addresses and telephone numbers set forth below or to your broker, dealer, commercial bank or trust company. Additional copies of the Offer to Purchase, this Letter of Transmittal, the Notice of Guaranteed Delivery and other tender offer materials may be obtained from the Information Agent or Dealer Manager as set forth below, and will be furnished at Purchaser’s expense.

9. Backup Withholding Tax. Under U.S. federal income tax law, a SunPower stockholder whose delivered Shares are accepted for payment pursuant to the Offer may be subject to backup withholding tax on the gross proceeds of any such payment. Backup withholding tax is not an additional tax. A SunPower stockholder subject to the backup withholding tax rules will be allowed a credit of the amount withheld against such stockholder’s U.S. federal income tax liability and, if backup withholding tax results in an overpayment of U.S. federal income tax, such stockholder may be entitled to a refund, provided that the requisite information is correctly furnished to the Internal Revenue Service (the “IRS”) in a timely manner.

To prevent backup withholding tax with respect to payments made to a U.S. stockholder pursuant to the Offer, the U.S. stockholder is required to timely notify the Depositary of the U.S. stockholder’s taxpayer identification number (“TIN”) by completing the attached Substitute Form W-9 and certifying, among other things, that the TIN provided on that form is correct (or that such U.S. stockholder is waiting for a TIN to be issued to it). If the Depositary is not timely provided with the correct TIN, such U.S. stockholder may be subject to a $50 penalty imposed by the IRS and payments that are made to such U.S. stockholder pursuant to the Offer may be subject to backup withholding tax. Certain U.S. stockholders (including, among others, corporations) are not subject to the backup withholding tax requirements described in this Instruction 9. To avoid possible erroneous backup withholding tax, a U.S. stockholder that is exempt from backup withholding tax should complete the Substitute Form W-9 by providing its correct TIN, signing and dating the form, and checking the “Exempt” box in Part 2.

A non-U.S. stockholder should submit to the Depositary an applicable IRS Form W-8. An applicable IRS Form W-8 will be provided to you by the Depositary upon request.

All SunPower stockholders should consult their own tax advisors to determine whether they are exempt from these backup withholding tax requirements and to determine which form should be used to avoid backup withholding tax.

10. Lost, Destroyed, Mutilated or Stolen Share Certificates. If any Share Certificate has been lost, destroyed, mutilated or stolen, the stockholder should promptly notify SunPower’s stock transfer agent, Computershare Trust Company, N.A., at (800) 546-5141. The stockholder will then be instructed as to the steps that must be taken in order to replace the Share Certificate. This Letter of Transmittal and related documents cannot be processed until the procedures for replacing lost, mutilated, destroyed or stolen Share Certificates have been followed.

11. Waiver of Conditions. Subject to the terms and conditions of the Tender Offer Agreement and the applicable rules and regulations of the Securities and Exchange Commission, the conditions of the Offer may be waived by Purchaser in whole or in part at any time and from time to time in its sole discretion.

12. Order of Purchase. As described in Section 1 of the Offer to Purchase, tendered shares may be subject to proration. Holders of Shares may designate the order in which their Shares are to be purchased in the event of proration. The order of purchase may have an effect on the U.S. federal income tax classification of any gain or loss on the Shares purchased. See Sections 1 and 5 of the Offer to Purchase.

IMPORTANT: THIS LETTER OF TRANSMITTAL OR AN AGENT’S MESSAGE, TOGETHER WITH SHARE CERTIFICATE(S) OR BOOK-ENTRY CONFIRMATION OR A PROPERLY COMPLETED AND DULY EXECUTED NOTICE OF GUARANTEED DELIVERY AND ALL OTHER REQUIRED DOCUMENTS MUST BE RECEIVED BY THE DEPOSITARY ON OR PRIOR TO THE EXPIRATION DATE.

GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION NUMBER ON SUBSTITUTE FORM W-9

Guidelines For Determining the Proper Identification Number to Give the Payer

Social Security Numbers (“SSNs”) have nine digits separated by two hyphens: i.e., 000-00-0000. Employer Identification Numbers (“EINs”) have nine digits separated by only one hyphen: i.e., 00-0000000. The table below will help determine the number to give the payer. All “section” references are to the Internal Revenue Code of 1986, as amended. “IRS” is the Internal Revenue Service.

NOTE: If no name is circled when more than one name is listed, the number will be considered to be that of the first name listed.

A person who is required to file an information return with the IRS must get your correct taxpayer identification number (“TIN”) to report, for example, income paid to you, real estate transactions, mortgage interest you paid, acquisition or abandonment of secured property, cancellation of debt, or contributions you made to an individual retirement account. Use Substitute Form W-9 to give your correct TIN to the requester (the person requesting your TIN) and, when applicable, (1) to certify the TIN you are giving is correct (or you are waiting for a number to be issued), (2) to certify you are not subject to backup withholding, or (3) to claim exemption from backup withholding if you are an exempt payee. The TIN provided must match the name given on the Substitute Form W-9.

If you do not have a TIN, apply for one immediately. To apply for an SSN, obtain Form SS-5, Application for a Social Security Card, at the local office of the Social Security Administration or get this form on-line at www.socialsecurity.gov. You may also get this form by calling 1-800-772-1213. Use Form W-7, Application for IRS Individual Taxpayer Identification Number, to apply for an ITIN, or Form SS-4, Application for Employer Identification Number, to apply for an EIN. You can apply for an EIN online by accessing the IRS website at www.irs.gov/businesses and clicking on Employer Identification Number (EIN) under Starting a Business. You can get Forms W-7 and SS-4 from the IRS by calling 1-800-TAXFORM (1-800-829-3676) or from the IRS web site at www.irs.gov.

If you do not have a TIN, write “Applied For” in Part 1, sign and date the form, and give it to the payer.

Note: Writing “Applied For” on the form means that you have already applied for a TIN or that you intend to apply for one soon. As soon as you receive your TIN, complete another Form W-9, include your TIN, sign and date the form, and give it to the payer.

CAUTION: A disregarded domestic entity that has a foreign owner must use the appropriate IRS Form W-8.

Individuals (including sole proprietors) are NOT exempt from backup withholding. Corporations are generally exempt from backup withholding for certain payments, such as interest and dividends.

Note: If you are exempt from backup withholding, you should still complete Substitute Form W-9 to avoid possible erroneous backup withholding. If you are exempt, enter your correct TIN in Part 1, check the “Exempt” box in Part 2, and sign and date the form. If you are a nonresident alien or a foreign entity not subject to backup withholding, give the requester the appropriate completed IRS Form W-8.

The following is a list of payees that may be exempt from backup withholding and for which no information reporting is required. For interest and dividends, all listed payees are exempt except for those listed in item (9). For broker transactions, payees listed in (1) through (13) and any person registered under the Investment Advisers Act of 1940 who regularly acts as a broker are exempt. Payments subject to reporting under sections 6041 and 6041A are generally exempt from backup withholding only if made to payees described in items (1) through (7). However, the following payments made to a corporation (including gross proceeds paid to an attorney under section 6045(f), even if the attorney is a corporation) and reportable on Form 1099-MISC are not exempt from backup withholding: (i) medical and health care payments, (ii) attorneys’ fees, and (iii) payments for services paid by a federal executive agency. Only payees described in items (1) through (5) are exempt from backup withholding for barter exchange transactions and patronage dividends.

Certain payments that are not subject to information reporting are also not subject to backup withholding. For details, see sections 6041, 6041A, 6042, 6044, 6045, 6049, 6050A and 6050N, and their regulations.

Section 6109 of the Internal Revenue Code requires you to give your correct TIN to persons who must file information returns with the IRS to report interest, dividends, and certain other income paid to you, mortgage interest you paid, the acquisition or abandonment of secured property, cancellation of debt, or contributions you made to an IRA or Archer MSA or HSA. The IRS may use the numbers for identification purposes and to help verify the accuracy of your tax return. The IRS may also provide this information to the Department of Justice for civil and criminal litigation and to cities, states, the District of Columbia, and U.S. possessions to carry out their tax laws. The IRS may also disclose this information to other countries under a tax treaty, or to federal and state agencies to enforce federal nontax criminal laws, or to federal law enforcement and intelligence agencies to combat terrorism.

You must provide your TIN whether or not you are required to file a tax return. Payers must generally withhold 28% (under current law) of taxable interest, dividends, and certain other payments to a payee who does not give a TIN to a payer. The penalties described below may also apply.

Failure to Furnish TIN. If you fail to furnish your correct TIN to a payer, you are subject to a penalty of US$50 for each such failure unless your failure is due to reasonable cause and not to willful neglect.

Civil Penalty for False Information With Respect to Withholding. If you make a false statement with no reasonable basis which results in no imposition of backup withholding, you are subject to a penalty of US$500.

Criminal Penalty for Falsifying Information. Willfully falsifying certifications or affirmations may subject you to criminal penalties including fines and/or imprisonment.

Misuse of TINs. If the payer discloses or uses TINs in violation of federal law, the payer may be subject to civil and criminal penalties.

Any questions or requests for assistance or additional copies of the Offer to Purchase and the Letter of Transmittal may be directed to the Information Agent or Dealer Manager at their respective telephone numbers and locations listed below. You may also contact your broker, dealer, commercial bank or trust company or other nominee for assistance concerning the Offer.


	IMPORTANT—SIGN BELOW
(and also complete Substitute Form W-9 or W-8)




		(Signature(s) of Stockholder(s))

	Dated: , 2011

	(Must be signed by registered owner(s) exactly as name(s) appear(s) on Share Certificate(s) or on a security position listing or by person(s) authorized to become registered owner(s) by certificates and documents transmitted herewith. If signature is by trustees, executors, administrators, guardians, attorneys-in-fact, officers of corporations or others acting in a fiduciary or representative capacity, please set forth full title and see Instruction 5. For information concerning signature guarantees, see Instruction 1.)

	Name(s):
		(Please Print)

	Capacity (full title):

	Address:
		(Include Zip Code)
	Daytime Area Code and Telephone Number:

	Taxpayer Identification
	or Social Security No.:

		GUARANTEE OF SIGNATURE(S) (For use by Eligible Institutions only; see Instructions 1 and 5)

	Name of Firm:

	Address:
		(Include Zip Code)

	Authorized Signature:

	Name:
		(Please Type or Print)
	Daytime Area Code and Telephone Number:

	Dated: , 2011


SUBSTITUTE FORM W-9 Department of the Treasury Internal Revenue Service Payer’s Request for Taxpayer Identification Number (“TIN”) and Certification	Name (as shown on your income tax return) Business Name, if different from above Check appropriate box: ¨ Individual/Sole proprietor ¨ Corporation ¨ Partnership ¨ Other Address City, State, and ZIP code
	Part 1—Taxpayer identification Number —Please provide your TIN in the box at right and certify by signing and dating below. If awaiting TIN, write “Applied For” in the box at right, certify by signing and dating below, and complete the following “Certificate of Awaiting Taxpayer Identification Number” box.	Social Security Number OR Employer Identification Number
	PART 2—For Payees Exempt from Backup Withholding—Check the box if you are NOT subject to backup withholding. ¨
	PART 3—Certification—Under penalties of perjury, I certify that: 1. The number shown on this form is my correct taxpayer identification number (or I am waiting for a number to be issued to me), 2. I am not subject to backup withholding because: (a) I am exempt from backup withholding, (b) I have not been notified by the Internal Revenue Service (IRS) that I am subject to backup withholding as a result of a failure to report all interest or dividends, or (c) the IRS has notified me that I am no longer subject to backup withholding, and 3. I am a U.S. person (including a U.S. resident alien). Certification Instructions.—You must cross out item 2 above if you have been notified by the IRS that you are currently subject to backup withholding because you have failed to report all interest and dividends on your tax return.

The Internal Revenue Service does not require your consent to any provision of this document other than the certifications required to avoid backup withholding. SIGNATURE DATE



For this type of account:	Give the NAME and SOCIAL SECURITY NUMBER or EMPLOYER IDENTIFICATION NUMBER of—	For this type of account:	Give the NAME and EMPLOYER IDENTIFICATION NUMBER of—
1. Individual	The individual	6. A valid trust, estate, or pension trust	Legal entity (4)
2. Two or more individuals (joint account)	The actual owner of the account or, if combined funds, the first individual on the account (1)	7. Corporation or LLC electing corporate status on Form 8832	The corporation
3. Custodian account of a minor (Uniform Gift to Minors Act)	The minor (2)	8. Association, club, religious, charitable, educational or other tax-exempt organization	The organization
4. a. The usual revocable savings trust (grantor is also trustee) b. The so-called trust account that is not a legal or valid trust under State law	The grantor-trustee (1) The actual owner (1)	9. Partnership or multimember LLC	The partnership or LLC
5. Sole proprietorship or single-owner LLC	The owner (3)	10. A broker or registered nominee	The broker or nominee



¨ Credit Shares tendered by book-entry transfer that are not accepted for payment to the DTC account set forth below.
(DTC Account Number)


Place medallion guarantee in space below: