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
(the "Partnership") on Form 10-Q for the three months ended March 31, 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 March 31, 2004.


Date: May 14, 2004
                                /s/ ERIC D. GADD
                                ------------------------------
                                Eric D. Gadd
                                Chief Executive Officer
                                Zond Windsystems Management LLC, as General
                                Partner of Zond-PanAero Windsystem Partners I