Sunpower (SPWRQ) 10-Q 2008 Q2 Quarterly report

EXHIBIT 32.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND

CHIEF FINANCIAL OFFICER PURSUANT TO

18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the quarterly report of SunPower Corporation (the “Company”) on Form 10-Q for the period ended June 29, 2008 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), each of Thomas H. Werner, Chief Executive Officer, and Emmanuel T. Hernandez, Chief Financial Officer, of the Company, certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of his knowledge and belief:

(1)                 The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)                 The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

  Dated: August 8, 2008

/S/ THOMAS H. WERNER

Thomas H. Werner

Chief Executive Officer

(Principal Executive Officer)

/S/ EMMANUEL T. HERNANDEZ

Emmanuel T. Hernandez

Chief Financial Officer

(Principal Financial and Accounting Officer)

The foregoing certification is being furnished solely pursuant to 18 U.S.C. Section 1350 and is not being filed as part of the Report or as a separate disclosure statement.