SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                -----------------

                                    FORM 8-K

                                 CURRENT REPORT
                     Pursuant to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934

                                -----------------

                          Date of Report: June 23, 2005
                          -----------------------------
                        (Date of earliest event reported)

                       Zond-PanAero Windsystem Partners I,
                        a California Limited Partnership
                        --------------------------------
             (Exact Name of Registrant as Specified in its Charter)

                  California             0-13510         77-003535
                  ----------             -------         ---------
        (State or Other Jurisdiction   (Commission     (IRS Employer
           of Incorporation)            File Number)   Identification No.)

               1221 Lamar Street, Suite 1600, Houston, Texas 77010
               ---------------------------------------------------
                    (Address of Principal Executive Offices)

                                 (713) 853-0530
                                 --------------
              (Registrant's telephone number, including area code)

                                       N/A
                                       ---
          (Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to
simultaneously satisfy the filing obligation of the registrant under any of the
following provisions:

[ ]  Written communications pursuant to Rule 425 under the Securities Act (17
     CFR 230.425)
[ ]  Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17
     CFR 240.14a-12)
[ ]  Pre-commencement communications pursuant to Rule 14d-2(b) under the
     Exchange Act (17 CFR 240.14d-2(b))
[ ]  Pre-commencement communications pursuant to Rule 13e-4(c) under the
     Exchange Act (17 CFR 240.13e-4(c))


<PAGE>


Item 1.01      Entry into a Material Definitive Agreement.
               ------------------------------------------

Reservation of Rights Agreement

     On June 23, 2005 Zond-PanAero Windsystem Partners I, a California limited
partnership (the "Partnership"), and PAMC Management Corporation, a Colorado
corporation ("PAMC"), which is an affiliate of Mesa Wind Developers ("Mesa"),
entered into a Reservation of Rights Agreement (the "Reservation of Rights
Agreement") pursuant to which the Partnership is able to (i) sell power, under a
Reformed Standard Offer 1 As-Available capacity and Energy Power Purchase
Agreement dated as of June 23, 2005 between SCE and PAMC (the "RSO1 Power
Agreement"), to Southern California Edison Company ("SCE") from the wind turbine
electric power generation facility (the "Wind Power Facility") owned by the
Partnership and (ii) interconnect the Partnership's Wind Power Facility with
SCE's transmission system under an Interconnection Facilities Agreement
effective as of June 23, 2005 between SCE and PAMC (the "Interconnection
Agreement"). Prior to June 23, 2005, the Partnership was selling energy from its
Wind Power Facility to SCE and interconnecting the Wind Power Facility to the
SCE transmission system pursuant to the Partial Assignment of Wind Park Power
Purchase Agreement effective September 25, 1984 between Mesa and the Partnership
(the "Partial Assignment") and the Wind Park Power Purchase and Sale Agreement
dated April 12, 1982 between SCE and Mesa (the "Wind Park Power Purchase
Agreement"). Each of the Partial Assignment and the Wind Park Power Purchase
Agreement terminated on or about June 23, 2005.

     Under the Reservation of Rights Agreement, the Partnership is permitted and
has agreed to sell up to 19.5 megawatts of energy to SCE under the RSO1 Power
Agreement and to interconnect the Partnership's Wind Power Facility to SCE's
transmission system under the Interconnection Agreement. The Reservation of
Rights Agreement terminates on December 31, 2005, unless terminated earlier by
the Partnership upon 30 days advance notice to PAMC. The Partnership is not
required under the Reservation of Rights Agreement to pay to PAMC a fee for the
Partnership's use of the RSO1 Power Agreement or Interconnection Agreement. The
Partnership is required to pay for a portion of all fees, costs and expenses
incurred by PAMC under the RSO1 Power Agreement and the Interconnection
Agreement, including, without limitation, interconnection fees, back feed
electricity costs and maintenance costs. The portion of such fees, costs and
expenses to be paid by the Partnership is based on the ratio of (x) the
aggregate installed name-plate capacity of the Partnership's Wind Power Facility
to (y) the aggregate installed name-plate capacity of all the wind power
projects delivering power to SCE under the RSO1 Power Agreement.

     PAMC also concurrently entered into a separate reservation of rights
agreement with Zond-PanAero Windsystem Partners II, a California limited
partnership ("ZWP II") pursuant to which PAMC granted ZWP II the right to sell
up to 10.5 megawatts of energy from its wind turbine electric power generation


<PAGE>


facility to SCE under the RSO1 Power Agreement and to interconnect such wind
power generation facility to SCE's transmission grid under the Interconnection
Agreement.

     Under the RSO1 Power Agreement, SCE is required to purchase from PAMC, and
PAMC is required to sell to SCE, the output from the Partnership's Wind Power
Facility and ZWP II's wind power facility, provided that the aggregate
name-plate capacity of all such generating facilities may not exceed 30
megawatts at any one time. The RSO1 Power Agreement has a five-year term, but
may be terminated by PAMC upon 30 days advance notice to SCE. The price to be
paid by SCE for the energy delivered under the RSO1 Power Agreement is equal to
the short run avoided cost to SCE for energy during the delivery period of such
energy. Under the RSO1 Power Agreement, SCE will also pay an annual capacity
payment for the installed capacity of such generation facilities that is based
on SCE's avoided cost for capacity.

     Unlike the Wind Park Power Purchase Agreement, which terminated on or about
June 23, 2005, the RSO1 Power Agreement does not contain a minimum energy price
payable by SCE. The minimum price for energy that was paid by SCE under the Wind
Park Power Purchase Agreement was $0.102 per kilowatt hour of energy. As a
result, the Partnership could receive significantly less revenue from the sale
of energy under the RSO1 Power Agreement as compared with the sale of an equal
amount of energy under the Wind Park Power Purchase Agreement.

     Under the Interconnection Agreement, PAMC and the other sellers under the
RSO1 Power Agreement are permitted to interconnect up to an aggregate of 30
megawatts of generating capacity to SCE's transmission grid at the existing SCE
substation located at the Wind Power Facility site. The Interconnection
Agreement requires PAMC to pay to SCE a monthly interconnection fee of $8,265.
The Interconnection Agreement terminates upon the termination of the RSO1 power
Agreement.

     A copy of each of the Reservation of Rights Agreement, the RSO1 Power
Agreement and the Interconnection Agreement is attached hereto as Exhibit 10.1,
10.2 and 10.3, respectively.

Extension of Management Agreement

     On June 23, 2005 the Partnership and Enron Wind Systems, LLC ("EWS")
entered into the Fourth Amendment to Windsystem Management Agreement (the
"Management Agreement Amendment"). Pursuant to the Windsystem Management
Agreement dated July 27, 1988 between the Partnership and EWS, as amended (the
"Management Agreement"), EWS manages the Wind Power Facility owned by the
Partnership. The Management Agreement Amendment extended the termination date of
the Management Agreement from June 23, 2005 to December 31, 2005.

     A copy of the Management Agreement Amendment is attached hereto as Exhibit
10.4.

Extension of Easement Agreement

     On June 23, 2005 the Partnership and Mesa entered into the Amendment to
Wind Park Easement Agreement (the "Easement Agreement Amendment"). Pursuant to
the Wind Park Easement Agreement dated as of September 7, 1984 between Mesa and
the Partnership (the "Easement Agreement"), the Partnership is able to use a
portion of the operating site and the infrastructural improvements in connection
with the operation of the Partnership's Wind Power Facility. The Easement
Agreement Amendment extended the termination date of the Easement Agreement from
June 23, 2005 to December 31, 2005.

     A copy of the Easement Agreement Amendment is attached hereto as Exhibit
10.5.

Additional information regarding the relationships among the parties to the
attached agreements and the other agreements material to the Partnership are set
forth in the Partnership's Form 10-K for its fiscal year ended December 31,
2004.


Item 9.01.      Financial Statements and Exhibits.
                ---------------------------------

      (c)  Exhibits.

10.1   Reservation of Rights Agreement dated as of June 23, 2005 between the
       Partnership and PAMC Management Corporation ("PAMC").

10.2   Reformed Standard Offer 1 As-Available Capacity and Energy Power Purchase
       Agreement dated June 23, 2005 between PAMC and Southern California Edison
       Company ("SCE").

10.3   Interconnection Facilities Agreement dated June 23, 2005 between PAMC and
       SCE.

10.4   Fourth Amendment to Windsystem Management Agreement dated as of June 23,
       2005, between the Partnership and Enron Wind Systems, LLC.

10.5   Amendment to Wind Park Easement Agreement dated June 23, 2005, between
       the Partnership and Mesa Wind Developers.


<PAGE>



                                    SIGNATURE

         Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.


                               Zond-PanAero Windsystem Partners I,
                               a California Limited Partnership
                                    By:  Zond Windsystems Management LLC,
                                         General Partner

Date: June 29, 2005                By:  /s/ Eric D. Gadd
                                         ---------------------------------
                                         Name:  Eric D. Gadd
                                         Title: President and Chief Executive
                                                Officer


<PAGE>


                                  Exhibit Index
                                  -------------


Exhibit   Description
-------   -----------

10.1      Reservation of Rights Agreement dated as of June 23, 2005 between the
          Partnership and PAMC Management Corporation ("PAMC").

10.2      Reformed Standard Offer 1 As-Available Capacity and Energy Power
          Purchase Agreement dated June 23, 2005 between PAMC and Southern
          California Edison Company ("SCE").

10.3      Interconnection Facilities Agreement dated June 23, 2005 between PAMC
          and SCE.

10.4      Fourth Amendment to Windsystem Management Agreement dated as of
          June 23, 2005, between the Partnership and Enron Wind Systems, LLC.

10.5      Amendment to Wind Park Easement Agreement dated June 23, 2005, between
          the Partnership and Mesa Wind Developers.
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{"company-data": {"conformed-name": "ZOND PANAERO WINDSYSTEM PARTNERS I", "cik": "0000767404", "assigned-sic": "4911", "irs-number": "770035358", "state-of-incorporation": "CA", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "000-13510", "film-number": "05925918"}, "business-address": {"street1": "1221 LAMAR STREET", "street2": "SUITE 1600", "city": "HOUSTON", "state": "TX", "zip": "77010", "phone": "713-345-3582"}, "mail-address": {"street1": "1221 LAMAR STREET", "street2": "SUITE 1600", "city": "HOUSTON", "state": "TX", "zip": "77010"}}
SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                -----------------

                                    FORM 8-K

                                 CURRENT REPORT
                     Pursuant to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934

                                -----------------

                          Date of Report: June 23, 2005
                          -----------------------------
                        (Date of earliest event reported)

                       Zond-PanAero Windsystem Partners I,
                        a California Limited Partnership
                        --------------------------------
             (Exact Name of Registrant as Specified in its Charter)

                  California             0-13510         77-003535
                  ----------             -------         ---------
        (State or Other Jurisdiction   (Commission     (IRS Employer
           of Incorporation)            File Number)   Identification No.)

               1221 Lamar Street, Suite 1600, Houston, Texas 77010
               ---------------------------------------------------
                    (Address of Principal Executive Offices)

                                 (713) 853-0530
                                 --------------
              (Registrant's telephone number, including area code)

                                       N/A
                                       ---
          (Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to
simultaneously satisfy the filing obligation of the registrant under any of the
following provisions:

[ ]  Written communications pursuant to Rule 425 under the Securities Act (17
     CFR 230.425)
[ ]  Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17
     CFR 240.14a-12)
[ ]  Pre-commencement communications pursuant to Rule 14d-2(b) under the
     Exchange Act (17 CFR 240.14d-2(b))
[ ]  Pre-commencement communications pursuant to Rule 13e-4(c) under the
     Exchange Act (17 CFR 240.13e-4(c))
Item 1.01      Entry into a Material Definitive Agreement.
               ------------------------------------------

Reservation of Rights Agreement

     On June 23, 2005 Zond-PanAero Windsystem Partners I, a California limited
partnership (the "Partnership"), and PAMC Management Corporation, a Colorado
corporation ("PAMC"), which is an affiliate of Mesa Wind Developers ("Mesa"),
entered into a Reservation of Rights Agreement (the "Reservation of Rights
Agreement") pursuant to which the Partnership is able to (i) sell power, under a
Reformed Standard Offer 1 As-Available capacity and Energy Power Purchase
Agreement dated as of June 23, 2005 between SCE and PAMC (the "RSO1 Power
Agreement"), to Southern California Edison Company ("SCE") from the wind turbine
electric power generation facility (the "Wind Power Facility") owned by the
Partnership and (ii) interconnect the Partnership's Wind Power Facility with
SCE's transmission system under an Interconnection Facilities Agreement
effective as of June 23, 2005 between SCE and PAMC (the "Interconnection
Agreement"). Prior to June 23, 2005, the Partnership was selling energy from its
Wind Power Facility to SCE and interconnecting the Wind Power Facility to the
SCE transmission system pursuant to the Partial Assignment of Wind Park Power
Purchase Agreement effective September 25, 1984 between Mesa and the Partnership
(the "Partial Assignment") and the Wind Park Power Purchase and Sale Agreement
dated April 12, 1982 between SCE and Mesa (the "Wind Park Power Purchase
Agreement"). Each of the Partial Assignment and the Wind Park Power Purchase
Agreement terminated on or about June 23, 2005.

     Under the Reservation of Rights Agreement, the Partnership is permitted and
has agreed to sell up to 19.5 megawatts of energy to SCE under the RSO1 Power
Agreement and to interconnect the Partnership's Wind Power Facility to SCE's
transmission system under the Interconnection Agreement. The Reservation of
Rights Agreement terminates on December 31, 2005, unless terminated earlier by
the Partnership upon 30 days advance notice to PAMC. The Partnership is not
required under the Reservation of Rights Agreement to pay to PAMC a fee for the
Partnership's use of the RSO1 Power Agreement or Interconnection Agreement. The
Partnership is required to pay for a portion of all fees, costs and expenses
incurred by PAMC under the RSO1 Power Agreement and the Interconnection
Agreement, including, without limitation, interconnection fees, back feed
electricity costs and maintenance costs. The portion of such fees, costs and
expenses to be paid by the Partnership is based on the ratio of (x) the
aggregate installed name-plate capacity of the Partnership's Wind Power Facility
to (y) the aggregate installed name-plate capacity of all the wind power
projects delivering power to SCE under the RSO1 Power Agreement.

     PAMC also concurrently entered into a separate reservation of rights
agreement with Zond-PanAero Windsystem Partners II, a California limited
partnership ("ZWP II") pursuant to which PAMC granted ZWP II the right to sell
up to 10.5 megawatts of energy from its wind turbine electric power generation
facility to SCE under the RSO1 Power Agreement and to interconnect such wind
power generation facility to SCE's transmission grid under the Interconnection
Agreement.

     Under the RSO1 Power Agreement, SCE is required to purchase from PAMC, and
PAMC is required to sell to SCE, the output from the Partnership's Wind Power
Facility and ZWP II's wind power facility, provided that the aggregate
name-plate capacity of all such generating facilities may not exceed 30
megawatts at any one time. The RSO1 Power Agreement has a five-year term, but
may be terminated by PAMC upon 30 days advance notice to SCE. The price to be
paid by SCE for the energy delivered under the RSO1 Power Agreement is equal to
the short run avoided cost to SCE for energy during the delivery period of such
energy. Under the RSO1 Power Agreement, SCE will also pay an annual capacity
payment for the installed capacity of such generation facilities that is based
on SCE's avoided cost for capacity.

     Unlike the Wind Park Power Purchase Agreement, which terminated on or about
June 23, 2005, the RSO1 Power Agreement does not contain a minimum energy price
payable by SCE. The minimum price for energy that was paid by SCE under the Wind
Park Power Purchase Agreement was $0.102 per kilowatt hour of energy. As a
result, the Partnership could receive significantly less revenue from the sale
of energy under the RSO1 Power Agreement as compared with the sale of an equal
amount of energy under the Wind Park Power Purchase Agreement.

     Under the Interconnection Agreement, PAMC and the other sellers under the
RSO1 Power Agreement are permitted to interconnect up to an aggregate of 30
megawatts of generating capacity to SCE's transmission grid at the existing SCE
substation located at the Wind Power Facility site. The Interconnection
Agreement requires PAMC to pay to SCE a monthly interconnection fee of $8,265.
The Interconnection Agreement terminates upon the termination of the RSO1 power
Agreement.

     A copy of each of the Reservation of Rights Agreement, the RSO1 Power
Agreement and the Interconnection Agreement is attached hereto as Exhibit 10.1,
10.2 and 10.3, respectively.

Extension of Management Agreement

     On June 23, 2005 the Partnership and Enron Wind Systems, LLC ("EWS")
entered into the Fourth Amendment to Windsystem Management Agreement (the
"Management Agreement Amendment"). Pursuant to the Windsystem Management
Agreement dated July 27, 1988 between the Partnership and EWS, as amended (the
"Management Agreement"), EWS manages the Wind Power Facility owned by the
Partnership. The Management Agreement Amendment extended the termination date of
the Management Agreement from June 23, 2005 to December 31, 2005.

     A copy of the Management Agreement Amendment is attached hereto as Exhibit
10.4.

Extension of Easement Agreement

     On June 23, 2005 the Partnership and Mesa entered into the Amendment to
Wind Park Easement Agreement (the "Easement Agreement Amendment"). Pursuant to
the Wind Park Easement Agreement dated as of September 7, 1984 between Mesa and
the Partnership (the "Easement Agreement"), the Partnership is able to use a
portion of the operating site and the infrastructural improvements in connection
with the operation of the Partnership's Wind Power Facility. The Easement
Agreement Amendment extended the termination date of the Easement Agreement from
June 23, 2005 to December 31, 2005.

     A copy of the Easement Agreement Amendment is attached hereto as Exhibit
10.5.

Additional information regarding the relationships among the parties to the
attached agreements and the other agreements material to the Partnership are set
forth in the Partnership's Form 10-K for its fiscal year ended December 31,
2004.

Item 9.01.      Financial Statements and Exhibits.
                ---------------------------------

      (c)  Exhibits.

10.1   Reservation of Rights Agreement dated as of June 23, 2005 between the
       Partnership and PAMC Management Corporation ("PAMC").

10.2   Reformed Standard Offer 1 As-Available Capacity and Energy Power Purchase
       Agreement dated June 23, 2005 between PAMC and Southern California Edison
       Company ("SCE").

10.3   Interconnection Facilities Agreement dated June 23, 2005 between PAMC and
       SCE.

10.4   Fourth Amendment to Windsystem Management Agreement dated as of June 23,
       2005, between the Partnership and Enron Wind Systems, LLC.

10.5   Amendment to Wind Park Easement Agreement dated June 23, 2005, between
       the Partnership and Mesa Wind Developers.
SIGNATURE

         Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.

                               Zond-PanAero Windsystem Partners I,
                               a California Limited Partnership
                                    By:  Zond Windsystems Management LLC,
                                         General Partner

Date: June 29, 2005                By:  /s/ Eric D. Gadd
                                         ---------------------------------
                                         Name:  Eric D. Gadd
                                         Title: President and Chief Executive
                                                Officer
Exhibit Index
                                  -------------

Exhibit   Description
-------   -----------

10.1      Reservation of Rights Agreement dated as of June 23, 2005 between the
          Partnership and PAMC Management Corporation ("PAMC").

10.2      Reformed Standard Offer 1 As-Available Capacity and Energy Power
          Purchase Agreement dated June 23, 2005 between PAMC and Southern
          California Edison Company ("SCE").

10.3      Interconnection Facilities Agreement dated June 23, 2005 between PAMC
          and SCE.

10.4      Fourth Amendment to Windsystem Management Agreement dated as of
          June 23, 2005, between the Partnership and Enron Wind Systems, LLC.

10.5      Amendment to Wind Park Easement Agreement dated June 23, 2005, between
          the Partnership and Mesa Wind Developers.