Exhibit 32.1
CERTIFICATIONS OF CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER
PURSUANT TO
RULE 13a-14(b)/RULE 15d-14(b) OF THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED,
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 Capstone Turbine Corporation (the “Company”) on
Form 10-Q for the quarterly period ended December 31, 2005, as filed with the Securities and Exchange
Commission on the date hereof (the “Report”), John R. Tucker, Chief Executive Officer of the
Company and Walter J. McBride, Chief Financial Officer of the Company, certify, pursuant to Section 906
of the Sarbanes-Oxley Act of 2002 (Subsections (a) and (b) of Section 1350, Chapter 63 of
Title 18, United States Code), that the Report complies with the requirements of Section 13(a) or 15(d)
of the Securities Exchange Act of 1934 and that information contained in the Report fairly
presents, in all material respects, the financial condition and results of operations of the
Company.
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By: |
/s/ JOHN R. TUCKER
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John R. Tucker |
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President and Chief Executive Officer |
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By: |
/s/ WALTER J. McBRIDE
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Walter J. McBride |
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Chief Financial Officer |
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Date: February 9, 2006