Exhibit 32.1


                    CERTIFICATION OF CHIEF EXECUTIVE 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 Zond-PanAero Windsystem Partners I, a
California Limited Partnership (the "Partnership") on Form 10-Q for the three
months ended June 30, 2004 as filed with the Securities and Exchange Commission
on the date hereof (the "Report"), I, Eric D. Gadd, Chief Executive Officer of
Zond Windsystems Management LLC, as General Partner of the Partnership, certify,
pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002, to the best of my knowledge and belief, that:

     (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 results of operations
          of the Partnership for the three months ended June 30, 2004.


Date: August 13, 2004
                                            /s/ ERIC D. GADD
                                            ------------------------------
                                            Eric D. Gadd
                                            Chief Executive Officer
                                            Zond Windsystems Management LLC, as
                                            General Partner of Zond-PanAero
                                            Windsystem Partners I, a
                                            California Limited Partnership