Document:

<PAGE>
                                                                   Exhibit 10.66

                      TEST REPORTING, ENGINEERING SERVICES
                                       AND
                            FIELD SERVICES AGREEMENT
                                      AMONG
                ECO FUEL CELLS, LLC, ENERGY CO-OPPORTUNITY, INC.
                                       AND
                                  H POWER CORP.

This Test Reporting, Engineering Services and Field Services Agreement
("Agreement") is entered into this 10 day of April, 2002 (the "Effective Date"),
among H Power Corp., 1373 Broad Street, Clifton, NJ 07013; H Power Enterprises
of Canada, Inc. (together "H Power"); and ECO Fuel Cells, LLC ("EFC") and Energy
Co-Opportunity, Inc. ("ECO") both of 2201 Cooperative Way, Herndon, VA 20171.
These parties are referred to herein singularly as "Party" and collectively as
"Parties." Defined terms used, but not otherwise defined herein, shall have the
respective meanings set forth in the Second Amended and Restated Fuel Cell
Product Operating Agreement, dated April 10, 2002 among the Parties (the
"Operating Agreement").

                                    RECITALS

WHEREAS: The Parties have entered into the Operating Agreement to, among other
things, further encourage the marketing of H Power's Fuel Cell Products, to
provide the Parties with additional marketing and distribution opportunities,
and to explore other products and services offered by H Power including new fuel
cell products and applications; and

WHEREAS: EFC's expertise in distributed generation equipment and installation is
transferable to the ongoing installation and maintenance of H Power's Fuel Cell
Products; and

WHEREAS: H Power desires to secure EFC's expertise in support, installation,
maintenance and other areas to help establish its customer service systems for
Fuel Cell Products; and

WHEREAS: The Parties have been engaged in a Fuel Cell testing program ("Testing
Program") under which H Power's Alpha and Beta Fuel Cell Power Systems have been
tested by EFC and its Cooperative Members in field operating conditions since
2000; and this Testing Program has developed valuable experience and data that
can be used to improve the design and the performance of Fuel Cell Power
Systems; and

WHEREAS: H Power wishes to have EFC collect, review and evaluate data concerning
the Testing Program and prepare a "Report" as defined herein, that will assist H
Power in its future Fuel Cell development plans and operations; and

WHEREAS: EFC has specific expertise in the ongoing Testing Program and also with
distributed generation equipment and installation that makes it exceptionally
qualified to evaluate such field results and to prepare a Report on the Testing
Program as described in this Agreement;

NOW, THEREFORE, in consideration of the promises herein and other valuable
consideration, the receipt and sufficiency of which is hereby acknowledged, the
Parties hereby agree as follows:

      1.    TEST REPORTING AND ENGINEERING SERVICES.

            a.    IMPROVEMENTS IN DESIGN AND PERFORMANCE. EFC will review,
                  evaluate and prepare a written report for H Power summarizing
                  the test results and information

----------
Certain portions of this exhibit have been omitted pursuant to a request for
confidential treatment. The omitted materials have been filed separately with
the Securities and Exchange Commission.

                                  Page 1 of 10

<PAGE>

                  on the Testing Program and identify areas of improvement for
                  both the design, performance, and similar issues involving the
                  Fuel Cell Power Systems Testing Program (the "Report"). EFC
                  will submit a proposed outline of the Report to H Power by May
                  15, 2002.

            b.    SITE AND INSTALLATION EVALUATION. EFC will evaluate the site
                  preparation and other installation costs and the installation
                  requirements of the Testing Program to determine what savings
                  and improvements could be made to simplify installation of
                  future Fuel Cell Power Systems.

            c.    PLACEMENT SCHEDULE FOR UNIT PLACEMENT. EFC will develop the
                  placement schedule for the RCU 4500 Units being tested by
                  Cooperative Members. This will help to match the current phase
                  of the Testing Program with the best candidates and site
                  locations for Unit placement. Unit placement recommendations
                  will be based primarily on the Fuel Cells Products'
                  specifications and installation and service economics.

            d.    PLACEMENT ISSUES. EFC will collect and evaluate environmental,
                  climatic and other related data that were observed and noted
                  in the Testing Program to develop better criteria for future
                  Fuel Cell Power System installations throughout the United
                  States.

            e.    CUSTOMER INPUT. EFC will secure customer recommendations and
                  input on the program, design issues, improvements or
                  suggestions and include them in the Report sections, as
                  appropriate, to further the design and development of Fuel
                  Cell Power Systems.

            f.    GRID COMPATIBILITY. EFC will evaluate the performance data
                  from the Testing Program to date to identify potential grid
                  interconnection and power quality issues.

            g.    HEAT EXCHANGE. EFC will assist in developing residential heat
                  exchange applications for domestic water and space heating for
                  both the retrofit and new construction applications.

            h.    SHIPPING AND DELIVERY. EFC shall work with H Power to evaluate
                  the information from the Testing Program to determine the most
                  efficient and effective shipping and delivery methods for Fuel
                  Cell Power Systems.

            i.    SERVICING REQUIREMENTS. EFC will evaluate and classify the
                  different skill levels of utility personnel to determine the
                  installation and service abilities of Cooperatives relevant to
                  the Testing Program.

            j.    ASSUMED OBLIGATIONS. EFC shall assume all obligations and
                  liabilities of H Power (including, but not limited to, those
                  set forth in Attachment 3 thereto) with respect to the Fuel
                  Cell Testing Agreements that have been entered into as of the
                  Effective Date between ECO or EFC and ECO's Licensed Members,
                  and H Power shall have no further obligations thereunder. In
                  addition, except with

                                  Page 2 of 10

<PAGE>

                  respect to Grandfathered Distribution Agreements, EFC shall
                  assume all obligations and liabilities of H Power with respect
                  to the Distribution Agreements and H Power shall have no
                  further obligations thereunder.

            2.    FIELD SERVICES SUPPORT TO H POWER.

                  a.    SERVICE AND INSTALLATION SUPPORT FOR FUEL CELL PRODUCTS.
                        EFC will work with H Power to set up the field service
                        and support infrastructure to service H Power's Fuel
                        Cell Products. EFC's support will be in conjunction with
                        the support activities provided by H Power's personnel,
                        and will include such activities as consulting with
                        purchasers about product performance, installation
                        requirements, maintenance and service concerns. H Power
                        will be responsible for all warranties that it may
                        provide from time to time, including its standard
                        warranty provisions for commercial products and for
                        warranty service for test units as stipulated in the
                        Operating Agreement. EFC shall assist H Power in
                        identifying those tasks necessary for setting up a field
                        service infrastructure for H Power and those Fuel Cell
                        activities internal to EFC. Specific tasks to be
                        performed by EFC shall include:

                        i.    Establish a service organization for the
                              installation, maintenance and service of H Power's
                              Fuel Cell Products within the United States. As a
                              part of this proposal, EFC shall conduct a study
                              to identify potential service and quality metrics
                              as based upon customer expectations of the service
                              network;

                        ii.   Assist in the development of budgets detailing the
                              anticipated costs of the potential repair and
                              maintenance of H Power's Fuel Cell Products
                              deployed in the field;

                        iii.  Develop and assist in managing an installation
                              system for all Fuel Cell Products within the
                              United States;

                        iv.   Develop a service data base to assist in
                              statistical analysis that interfaces with H
                              Power's sales and marketing data base to support
                              forward purchasing and the support of spare parts'
                              purchases;

                        v.    Develop the processes required to continually
                              reduce the cost of service and installation;

                        vi.   Obtain and/or assist in obtaining the required
                              permits and licenses for the installation of H
                              Power's Fuel Cell Products in Cooperative
                              Territory; and

                        vii.  Implement an electronic data acquisition and
                              monitoring system, to enable the continuous
                              monitoring of the performance of H Power's Fuel
                              Cell Products deployed in the field.

                  b.    LIMITATIONS. IN NO EVENT SHALL THE PARTIES (INCLUDING
                        THEIR OFFICERS, DIRECTORS, EMPLOYEES, AGENTS AND
                        ATTORNEYS) BE LIABLE FOR ANY INDIRECT, SPECIAL,
                        INCIDENTAL OR CONSEQUENTIAL DAMAGES (INCLUDING BUT NOT
                        LIMITED TO LOST PROFITS) IN THE PERFORMANCE OF THEIR
                        DUTIES UNDER THIS AGREEMENT, EVEN IF THEY HAVE NOTICE OF
                        THE POSSIBILTY OF SUCH DAMAGES, EXCEPT FOR (I)

                                  Page 3 of 10

<PAGE>

                        ANY PRODUCT LIABILITY, (II) ANY INFRINGEMENT OF
                        INTELLECTUAL PROPERTY RIGHTS, AND (III) OTHER DAMAGES
                        CAUSED BY NEGLIGENCE OR WILLFUL MISCONDUCT OF THE
                        PARTIES OR THEIR EMPLOYEE(S). HOWEVER, NOTHING HEREIN IS
                        TO LIMIT OR CHANGE THE PROVISIONS OF THE EFC-H POWER
                        OPERATING AGREEMENT (AS AMENDED FROM TIME TO TIME).

                  c.    SERVICE, MAINTENANCE, AND FACILITY REQUIREMENTS. EFC
                        will assist H Power in developing a service and
                        maintenance resource allocation system with a goal to
                        maximize customer service at the lowest reasonable cost.

                  d.    CREATION OF AND SUPPORT FOR H POWER'S SERVICE AND
                        SUPPORT DEPARTMENT. EFC shall propose and arrange for
                        the development and implementation of a new H Power
                        Service and Support Department, and shall have a right
                        of first refusal to manage this Department for H Power
                        under terms to be agreed to by the Parties; provided
                        that EFC's proposal is found satisfactory by H Power.
                        EFC will, in cooperation with H Power:

                        i.    Develop position descriptions, hiring criteria,
                              and a performance evaluation process for service
                              and support employees;

                        ii.   Work with H Power's engineering and other staff to
                              develop servicing and maintenance requirements for
                              Fuel Cell Products compatible with the product
                              design;

                        iii.  Assist H Power in determining H Power's
                              requirements for the hiring of an after market
                              service and support manager; and field service
                              engineers, if appropriate.

                  e.    CREATION OF AND SUPPORT FOR H POWER'S DOMESTIC SERVICE
                        NETWORK. EFC shall assist in the creation of H Power's
                        domestic service network, and shall have the right of
                        first refusal to manage this network, under terms to be
                        agreed to by the Parties, including the following
                        duties:

                        i.    Identify those Cooperative members deemed suitable
                              to be appointed as a field service office to
                              support field service and installation hereinafter
                              (the "Satellite Offices");

                        ii.   Determine the suitable geographical locations
                              within the United States to maintain field service
                              office(s);

                        iii.  Perform a field study to determine the use of HVAC
                              suppliers, renewable energy systems integrators,
                              or mechanical and electrical contractors to
                              support the field service and installation
                              function; and

                        iv.   Assist H Power in maintaining a minimum inventory
                              of spare parts in the Satellite Offices to support
                              field services repairs.

                  f.    TRAINING AND DOCUMENTATION. EFC shall assist H Power in
                        H Power's on-going process of documentation development
                        and training development for H Power's Fuel Cell
                        Products, including:

                                  Page 4 of 10

<PAGE>

                        i.    Develop manuals for Fuel Cell Products with the
                              assistance of H Power engineers, including
                              installation, operation and service and
                              maintenance; and

                        ii.   Assist in the training of field service personnel
                              at H Power's Monroe facility in the installation
                              and operation and repair of H Power's Fuel Cell
                              Products.

                  g.    PROCESS RELATED ISSUES

                        i.    Reporting

                                    EFC shall assist H Power in creating and
                                    implementing a service reporting and
                                    analysis system for all Fuel Cell Products
                                    that includes performance issues, the number
                                    and nature of field service calls, and other
                                    items.

                        ii.   Continual Product Improvement

                                    EFC shall work with ECO's Engineering
                                    Committee and others as appropriate to
                                    establish a system that captures performance
                                    information from Fuel Cell Product users to
                                    assist H Power in achieving its goal of
                                    continued product improvement.

            3.    PROJECT MANAGER. EFC's Project Manager for this Agreement
                  shall be Brian Wierenga. The Project Manager shall, in
                  addition to the other duties prescribed in this Agreement,
                  develop a travel budget for this Agreement, working closely
                  with H Power. During the term of this Agreement, Mr. Wierenga
                  shall integrate the H Power activities described herein into
                  his EFC workload, and shall be responsible for establishing
                  work priorities, schedules, and completion of work requests.
                  Mr. Wierenga shall inform both EFC and H Power when potential
                  or real conflicts of activities or scheduling exist, and the
                  Parties shall mutually resolve such conflicts for Mr.
                  Wierenga. During the term of this Agreement, H Power shall not
                  solicit any EFC staff for employment.

                  H Power and EFC shall agree to prepare travel (including
                  transportation, lodging, meals, and entertainment) and other
                  budgets from time to time to carry out the purposes of this
                  Agreement. In addition to the payments made under Attachment A
                  of this Agreement, any travel to be performed at H Power's
                  request that exceeds $3,000 per month shall be paid for by H
                  Power, except as may otherwise be agreed to in writing by the
                  Parties. EFC shall provide satisfactory documentation for such
                  expenses in such detail as H Power may reasonably request.

            4.    PAYMENT FOR TEST REPORTING, ENGINEERING AND FIELD SERVICES.

                  Subject to Sections 5, 6 and 7 hereof, in exchange for the
                  above services, H Power will pay EFC up to $2.2 million per
                  the Schedule in Attachment A of this Agreement. EFC may bill H
                  Power monthly or quarterly for its services. Payment of
                  invoices will be due and payable 15 days after receipt by H
                  Power.

            5.    AFFIRMATIVE AND NEGATIVE COVENANTS.

                                  Page 5 of 10

<PAGE>

                  Notwithstanding anything contained in this Agreement to the
                  contrary, this Agreement is subject to certain binding
                  Affirmative and Negative Covenants ("Covenants") contained in
                  a "Memorandum of Agreement," entered into by the Parties on
                  the date of this Agreement.

            6.    NO MATERIAL ADVERSE CHANGE. Notwithstanding anything contained
                  in this Agreement to the contrary, H Power shall have no
                  obligation to make payments to EFC during the Term hereof, if
                  there has been a "Material Adverse Change." For the purposes
                  of this Agreement, a Material Adverse Change shall only be
                  defined as a material violation of Sections 2, 3, 4, or 5 of
                  the Memorandum of Agreement.

            7.    FAILURE TO COMPLY. Notwithstanding anything contained in this
                  Agreement to the contrary, upon ECO's and/or EFC's breach of
                  any of the Affirmative or Negative Covenants set forth in the
                  Memorandum of Agreement, H Power shall have the unilateral
                  right to suspend payment of any monies due to EFC hereunder
                  (including those set forth on Attachment A hereto) until such
                  time that ECO and/or EFC cures such breach to H Power's
                  satisfaction.

            8.    TERM.

                  This Agreement shall terminate upon: i) the completion of
                  EFC's and ECO's duties referred to herein; or ii) the written
                  agreement of the Parties.

            9.    DISPUTES.

                  The Parties agree that any and all controversies or claims
                  arising out of or relating to this Agreement, or any alleged
                  breach hereof, shall be resolved by binding arbitration as
                  prescribed herein, upon 30 days' written notice to the other
                  Party. In that event, each Party will select one (1)
                  arbitrator, and those two (2) will select a third. The
                  arbitrators shall conduct the arbitration under the then
                  current rules of the American Arbitration Association ("AAA"),
                  unless otherwise provided herein. The arbitrator(s) will be
                  selected in accordance with AAA procedures from a list of
                  qualified arbitrators maintained by AAA. The arbitration will
                  be conducted in Washington, D.C. and all expedited procedures
                  prescribed under AAA rules will apply. Unless the Parties
                  otherwise agree, the proceedings will be completed within
                  forty-five (45) days of the Parties' receipt of notice of
                  arbitration. Each Party will bear its own costs and attorney's
                  fees and disbursements; and shall share equally the costs of
                  the arbitrators.

            10.   MUTUAL COOPERATION.

                  The Parties agree to take such other actions and execute such
                  other documents as shall be necessary to carry out the
                  provisions of this Agreement.

            11.   INTEGRATION.

                                  Page 6 of 10

<PAGE>

                  With the exception of the Operating Agreement and the
                  Memorandum of Agreement, this Agreement (including any
                  Schedules and Exhibits attached hereto) constitutes the entire
                  agreement among the Parties with respect to the subject matter
                  hereof and supercedes all prior and contemporaneous agreements
                  and undertakings, written or oral, of any nature whatsoever of
                  the Parties hereto with respect to the subject matter hereof.

            12.   NOTICES. All notices, and other communications hereunder shall
                  be in writing and shall be deemed to have been duly given when
                  delivered in person, by telecopy (with confirmation of
                  transmission), by express or overnight mail delivered by a
                  nationally recognized air courier (delivery charges prepaid),
                  or by registered or certified mail (postage prepaid, return
                  receipt requested) to the Parties at their respective
                  addresses set forth in the preamble of this Agreement or to
                  such other address as the Party to whom notice is given may
                  have previously furnished to the other Parties in writing in
                  the manner set forth above. Any notice or communication
                  delivered in person shall be deemed effective on delivery. Any
                  notice or communication sent by telecopy or by air courier
                  shall be deemed effective on the first business day at the
                  place at which such notice or communication is received
                  following the day on which such notice or communication was
                  sent. Any notice or communication sent by registered or
                  certified mail shall be deemed effective on the fifth business
                  day at the place from which such notice or communication was
                  mailed following the day on which such notice or communication
                  was mailed.

            13.   PARTY'S RELATIONSHIP. Neither Party by this Agreement makes
                  the other Party its legal representative or agent. Neither
                  Party shall assign this Agreement to any other third party,
                  without the other Party's prior written permission, except
                  that ECO and ECO Fuel Cells may assign it to a Cooperative
                  Member.

            14.   NO RIGHTS IN THIRD PARTIES. Nothing contained in this
                  Agreement shall be construed as giving rise to any rights to
                  enforce its provisions to any person or entity not a Party to
                  this Agreement under any legal theory.

            15.   COUNTERPARTS. This Agreement may be executed in any number of
                  counterparts, each of which shall be deemed to be an original
                  as against any Party whose signature appears thereon, and all
                  of which shall together constitute one and the same
                  instrument. This Agreement shall become binding when one or
                  more counterparts hereof, individually or taken together,
                  shall bear the signatures of all the Parties hereon as
                  signatories.

            16.   SEVERABILITY. If any provision of this Agreement for any
                  reason shall be held to be illegal, invalid or unenforceable,
                  such illegality shall not affect any other provision of this
                  Agreement, but this Agreement shall be construed as if such
                  illegal, invalid or unenforceable provision had never been
                  included herein.

                                  Page 7 of 10

<PAGE>

IN WITNESS WHEREOF the undersigned Parties hereby execute this Agreement.

         H POWER CORP.                       H POWER ENTERPRISES OF CANADA, INC.

         /s/ William L. Zang                 /s/ H. Frank Gibbard
         -------------------------------     -----------------------------------

                                  Page 8 of 10

<PAGE>

     ECO FUEL CELLS, LLC                  ENERGY CO-OPPORTUNITY INC.

     /s/ William C. Cetti                 /s/ William C. Cetti
     ----------------------------------   ------------------------------------
     William C. Cetti, President & CEO    William C. Cetti, President and CEO

                                  Page 9 of 10

<PAGE>

                                  ATTACHMENT A

        TEST REPORTING, ENGINEERING SERVICES AND FIELD SERVICES AGREEMENT
                                      AMONG
                 ECO FUEL CELLS, LLC, ENERGY CO-OPPORTUNITY INC.
                                       AND
                                  H POWER CORP.

                            H POWER'S PAYMENTS TO EFC

         Subject to the terms and conditions set forth in the Agreement, H Power
         shall make the following payments to EFC:

<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------------------
                                APRIL 2002     QTR 2-2002     QTR 3-2002     QTR 4-2002     SUBTOTAL
=====================================================================================================
<S>                             <C>               <C>            <C>            <C>          <C>
Field Services                      [*]            [*]            [*]            [*]          [*]
-----------------------------------------------------------------------------------------------------
Test Program Evaluation/Report      [*]            [*]            [*]            [*]          [*]
=====================================================================================================
                        TOTAL       [*]            [*]            [*]            [*]          [*]
-----------------------------------------------------------------------------------------------------

<CAPTION>
----------------------------------------------------------------------------------------------------------
                                  QTR 1-2003     QTR 2-2003     QTR 3-2003     QTR 4-2003       TOTALS
==========================================================================================================
<S>                                  <C>            <C>            <C>            <C>            <C>
Field Services                        [*]            [*]            [*]            [*]            [*]
----------------------------------------------------------------------------------------------------------
Test Program Evaluation/Report        [*]            [*]            [*]            [*]            [*]
==========================================================================================================
                        TOTAL         [*]            [*]            [*]            [*]         $2,200,000
----------------------------------------------------------------------------------------------------------
</TABLE>

---
* Confidential

                                  Page 10 of 10<PAGE>

                                                                   Exhibit 10.67

                             MEMORANDUM OF AGREEMENT

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

This MEMORANDUM OF agreement ("Agreement") is entered into this 10 day of April,
2002 (the "Effective Date"), among H Power Corp., 1373 Broad Street, Clifton, NJ
07013; H Power Enterprises of Canada, Inc. (together "H Power"); ECO Fuel Cells,
LLC ("EFC") and Energy Co-Opportunity, Inc. ("ECO"), both of 2201 Cooperative
Way, Herndon, VA 20171. These parties are referred to herein singularly as
"Party" and collectively as "Parties". Defined terms used, but not otherwise
defined herein, shall have the respective meanings set forth in the Second
Amended and Restated Fuel Cell Product Operating Agreement, dated April
 ____, 2002, among the Parties (the "Operating Agreement").

WHEREAS: Over the past few years, H Power and EFC have been working together to
design, build, and market Fuel Cell Power Systems for all areas in the United
States served by Cooperatives;

WHEREAS: the Parties wish to further fund and encourage the marketing of Fuel
Cell Power Systems by providing H Power and ECO with additional marketing and
distribution opportunities and granting H Power marketing, technical, training,
field and other services from EFC;

WHEREAS: the Parties have entered into the Operating Agreement to further these
goals and have entered into other agreements in support of such goals, including
a "Sales and Marketing Services Agreement among ECO Fuel Cells, LLC, Energy
Co-Opportunity, Inc. and H Power Corp." ("Sales and Marketing Agreement"); and a
"Test Reporting, Engineering Services and Field Services Agreement among ECO
Fuel Cells, LLC, Energy Co-Opportunity, Inc. and H Power Corp." ("Test Reporting
Agreement"); and

WHEREAS: the Parties desire to enter into this Agreement to terminate the
Memorandum of Agreement, dated December 12, 2001, among the Parties (the
"December MOA") and to provide for a commitment by the Parties to explore the
development of sustainable fuel cell communities.

NOW, THEREFORE, in consideration of the promises herein and other valuable
consideration, the receipt and sufficiency of which is hereby acknowledged, the
Parties hereby agree as follows:

1.    SUSTAINABLE FUEL CELL COMMUNITIES OR SIMILAR APPLICATIONS. Subject to
      Sections 3. and 7. herein, H Power will provide up to $1,500,000 of
      start-up funding to EFC, payable as set forth on Attachment A, for
      development of sustainable fuel cell communities (or similar applications
      as determined by the Parties) that could include the generation, storage,
      transmission, distribution and utilization of hydrogen-based fuel cells.
      EFC and H Power will seek to raise funding from third-party sources for
      these purposes, including from the government, hydrogen-related suppliers
      and other private sector sources. If such funds are received by EFC, this
      $1,500,000 obligation of H Power to EFC shall be reduced by the same
      amount, or if payment has already been made by H Power to EFC, the funds
      will be promptly reimbursed to H Power. H Power's payment to EFC shall be
      reduced by an amount not to exceed One Million Dollars ($1,000,000), less
      any adjustment for taxes, which EFC receives from the sale of Altair
      Energy, LLC.

2.    FINANCIAL STATEMENTS. ECO and EFC have delivered to H Power the September
      2001 unaudited financial statements. ECO and EFC attest that these
      financial statements have been prepared in accordance with GAAP and fairly
      present the financial condition and the results of operations of ECO and
      EFC as at the dates and for the periods set forth therein.

----------
Certain portions of this exhibit have been omitted pursuant to a request for
confidential treatment. The omitted materials have been filed separately with
the Securities and Exchange Commission.

                                  Page 1 of 8

<PAGE>

      Beginning with the first calendar quarter of 2002, ECO and EFC shall each
      furnish H Power 1) within forty-five (45) days after the end of each
      fiscal quarter, quarterly unaudited financial statements, all in
      reasonable detail, fairly presenting the financial position and the
      results of operations of ECO and EFC as of the end of and through such
      fiscal quarter; and 2) within one hundred twenty (120) days after the end
      of each fiscal year, audited financial statements and the accompanying
      notes thereto, all in reasonable detail, fairly presenting the financial
      position and the results of operations of ECO and EFC as of the end of and
      for such fiscal year together with the opinion of independent certified
      public accountants, that such financial statements had been prepared in
      accordance with GAAP.

3.    NO MATERIAL ADVERSE CHANGE; DEFAULT. Notwithstanding anything contained in
      this Agreement to the contrary, H Power shall have no obligation to make
      any payments to EFC under this Agreement, the Sales and Marketing
      Agreement and the Test Reporting Agreement, if there has been a "Material
      Adverse Change." In the event that NRUCFC, as defined herein, declares an
      event of default under the terms of any of its agreements with ECO and/or
      EFC, that event, or any violation of Sections 2, 4, and/or 5 of this
      Agreement, shall be considered a Material Adverse Change under this
      Agreement.

4.    AFFIRMATIVE COVENANTS. From the Effective Date until the end of the Term
      hereof, ECO and EFC shall:

      A.    Prior to January 1, 2003, EFC and/or ECO will provide H Power with
            its annual operating budget for the calendar year ending December
            31, 2003. The budget shall insure that adequate funding is available
            for EFC and ECO to complete their obligations in this Agreement and
            to continue in business through December 31, 2003.

      B.    Provide H Power and its representatives access during normal
            business hours to ECO's and EFC's books, accounts and records and
            all other relevant documents and information as representatives of H
            Power may from time to time request. Such access may include
            consultations with the personnel of ECO and EFC and/or professionals
            and consultants responsible for the preparation of financial
            statements. ECO and EFC shall make their respective premises and
            personal property available for inspection by H Power and its
            representatives during normal business hours;

      C.    Notify H Power in writing of (i) any Material Adverse Change in
            their financial position, earnings or prospects, (ii) any
            governmental complaints, investigations or hearings to which ECO
            and/or EFC are a party, (iii) any material pending legal actions to
            which ECO and/or EFC are a party; or (iv) any threatened legal
            action.

      D.    Operate their businesses as presently operated and only in the
            ordinary course of business and, consistent with such operation,
            make commercially reasonable efforts to comply in all respects with
            all applicable legal and contractual obligations; and

      E.    Keep in full force and effect all insurance related to their
            businesses, comparable in amount and scope of coverage to that now
            maintained. ECO and EFC will furnish to H Power appropriate
            certificates of insurance confirming such coverage.

                                  Page 2 of 8

<PAGE>

5.    NEGATIVE COVENANTS.

      A.    Notwithstanding any other provisions in this Agreement:

            1.    ECO and its affiliates may create a new technology business
                  organization to support innovative technologies and fund it;
                  provided that 100 percent of the funding for this organization
                  shall be provided from sources outside of H Power's funding
                  under this Agreement, the Sales and Marketing Agreement, and
                  the Test Reporting Agreement, unless otherwise agreed to in
                  writing by H Power. Any funding from ECO and EFC for this
                  purpose shall be included in the reporting obligations in
                  Section 4. of this Agreement; and

            2.    Nothing in this Agreement shall interfere with any
                  requirements imposed upon ECO or EFC by the National Rural
                  Utilities Cooperative Finance Corporation (NRUCFC) under their
                  existing agreements or new agreements that are necessary to
                  continue or increase funding for ECO or EFC.

      B.    ECO and EFC immediately shall notify H Power anytime that there is
            any "Negative Deviation" from the annual EFC or ECO budget.
            "Negative Deviation" is defined as a negative change or the prospect
            of a negative change in excess of fifteen percent (15%) of the net
            income/(loss) of ECO on a quarterly basis (any accrued interest
            payments on loans from NRUCFC shall not be included in this
            calculation). This provision shall not apply to any sales of propane
            and other equipment that are made after a purchase order for such
            sales has been received by ECO or such other events as may be agreed
            to by the Parties in writing from time to time. At H Power's written
            request, ECO or EFC shall immediately take such steps as may be
            necessary to bring its budget back into compliance within forty-five
            (45) days or a Material Adverse Change shall be deemed to have
            occurred.

      C.    ECO and EFC agree not to do any of the following if they involve a
            dollar amount in excess of $50,000 (unless it has been previously
            budgeted or covered by a customer purchase order):

            1.    pledge, or otherwise encumber any shares of their capital
                  stock, any other voting securities or any securities
                  convertible into or exchangeable for, or any rights, warrants,
                  or options to acquire, any such shares, voting securities, or
                  convertible or exchangeable securities except to extend the
                  terms of its H Power stock sale plan, or as otherwise
                  described in this Agreement, such as the creation of a
                  technology company and to obtain funding from NRUCFC;

            2.    acquire, make any investment in, or make any capital
                  contributions to, any person or entity other than in the
                  ordinary course of business;

            3.    sell, transfer, lease, license, pledge, mortgage or otherwise
                  dispose of or encumber any of their properties or assets,
                  other than in the ordinary course of business; the sale of any
                  interest in Altair Energy, LLC is excluded from this
                  provision;

                                  Page 3 of 8

<PAGE>

            4.    a) incur any indebtedness, other than borrowings under
                  existing credit facilities, b) make any loans or advances to
                  any other person or entity, other than routine advances to
                  employees consistent with past practice or c) assume,
                  guarantee, endorse or otherwise become liable or responsible
                  (whether directly, contingently or otherwise) for the
                  obligations of any other person;

            5.    enter into any compromise or settlement of, or take any action
                  with respect to, any litigation or proceeding other than the
                  prosecution, defense, and settlement thereof in the ordinary
                  course of business;

            6.    merge or consolidate with, or acquire (except in the ordinary
                  course of business) any of the assets of any other
                  corporation, business or person; and

            7.    enter into any transaction for the purchase, sale or exchange
                  of property or the rendering of any service to or by any
                  affiliate, except upon terms no less favorable to ECO and/or
                  EFC than they would obtain in a comparable arm's length
                  transaction with an unaffiliated person.

6.    FAILURE TO COMPLY. Notwithstanding anything contained in this Agreement to
      the contrary, upon ECO's and/or EFC's breach of any of the Affirmative or
      Negative Covenants set forth in Paragraphs 4 and 5 of this Agreement, H
      Power shall have the unilateral right to suspend payment of any further
      monies due to EFC as set forth on Attachment A of this Agreement, and
      under Attachment A of the Sales and Marketing and Test Reporting
      Agreements, until such time that ECO and/or EFC cures such breach to H
      Power's satisfaction.

7.    TERM. This Agreement shall terminate when all the provisions are
      satisfied, but no later than December 31, 2003; except that,
      notwithstanding any termination of this Agreement, Sections 3, 4, 5 and 6
      of this Agreement shall survive and remain in full force and effect until
      the Sales and Marketing and Test Reporting Agreements have been
      terminated.

8.    NO RIGHTS IN THIRD PARTIES. Nothing contained in this Agreement shall be
      construed as giving rise to any rights to enforce its provisions to any
      person or entity not a Party to this Agreement under any legal theory.

9.    PARTY'S RELATIONSHIP. Neither Party by this Agreement makes the other
      Party its legal representative or agent. Neither Party shall assign this
      Agreement to any other third party, without the other Party's prior
      written permission, except that ECO Fuel Cells may assign it to a
      Cooperative Member.

10.   DISPUTES. The Parties agree that any and all controversies or claims
      arising out of or relating to this Agreement, or any alleged breach
      hereof, shall be resolved by binding arbitration as prescribed herein,
      upon 30 days' written notice to the other Party. In that event, the
      Parties each Party shall select one (1) arbitrator and those shall select
      a third. The three (3) arbitrators will conduct the arbitration under the
      then current rules of the American Arbitration Association ("AAA"), unless
      otherwise provided herein. The arbitrator(s) will be selected in
      accordance with AAA procedures from a list of qualified arbitrators
      maintained by AAA. The arbitration will be conducted in Washington, D.C.
      and all expedited procedures prescribed under AAA rules will apply. Unless
      the Parties otherwise agree, the

                                  Page 4 of 8

<PAGE>

      proceedings will be completed within forty-five (45) days of the Parties'
      receipt of notice of arbitration. Each Party will bear its own costs and
      attorney's fees.

11.   TERMINATION OF DECEMBER MOA. Effective as of the Effective Date, the
      December MOA, and each of the terms, provisions and covenants contained
      therein, shall terminate and be of no further force or effect.

12.   ENTIRE AGREEMENT. With the exception of the Operating Agreement, Sales and
      Marketing Agreement, and the Test Reporting Agreement, this Agreement
      (including any Schedules and Exhibits attached hereto) constitutes the
      entire agreement among the Parties with respect to the subject matter
      hereof and supercedes all prior and contemporaneous agreements and
      undertakings, written or oral, of any nature whatsoever of the Parties
      hereto with respect to the subject matter hereof.

13.   COUNTERPARTS. This Agreement may be executed in any number of
      counterparts, each of which shall be deemed to be an original as against
      any Party whose signature appears thereon, and all of which shall together
      constitute one and the same instrument. This Agreement shall become
      binding when one or more counterparts hereof, individually or taken
      together, shall bear the signatures of all the Parties hereon as
      signatories.

14.   SEVERABILITY. If any provision of this Agreement for any reason shall be
      held to be illegal, invalid or unenforceable, such illegality shall not
      affect any other provision of this Agreement, but this Agreement shall be
      construed as if such illegal, invalid or unenforceable provision had never
      been included herein.

15.   MUTUAL COOPERATION. The Parties agree to take such other actions and
      execute such other documents as shall be necessary to carry out the
      provisions of this Agreement.

IN WITNESS WHEREOF the undersigned Parties hereby execute this Agreement as of
the Effective Date.

                                  Page 5 of 8

<PAGE>

         H POWER CORP.                      H POWER ENTERPRISES OF CANADA, INC.

         /s/ William L. Zang                /s/ H. Frank Gibbard
         ----------------------------       ----------------------------------

                                  Page 6 of 8

<PAGE>

         ECO FUEL CELLS, LLC                   ENERGY CO-OPPORTUNITY, INC.

         /s/ William C. Cetti                  /s/ William C. Cetti
         ---------------------------------     --------------------
         William C. Cetti, President & CEO     William C. Cetti, President & CEO

                                  Page 7 of 8

<PAGE>

                                  ATTACHMENT A
            ATTACHMENT OF H POWER'S PAYMENTS TO ECO FUEL CELLS (EFC)

Subject to the terms and conditions set forth in the Agreement, H Power shall
make the following payments to EFC:

<TABLE>
<CAPTION>
----------------------------------------------------------------------------------------------------------------------
                                 EFFECTIVE
                                   DATE        QTR 1-2002     QTR 2-2002      QTR 3-2002     QTR 4-2002      SUBTOTAL
======================================================================================================================
<S>                                             <C>            <C>             <C>            <C>           <C>
SUSTAINABLE FUEL CELL COMM.                        [*}            [*}            [*}            [*}            [*}
======================================================================================================================
                       TOTAL                       [*]            [*]            [*]            [*]            [*]
----------------------------------------------------------------------------------------------------------------------

<CAPTION>
-----------------------------------------------------------------------------------------------------------

                                   QTR 1-2003      QTR 2-2003     QTR 3-2003     QTR 4-2003       TOTALS
===========================================================================================================
<S>                                 <C>             <C>            <C>            <C>            <C>
SUSTAINABLE FUEL CELL COMM.            [*}            [*}            [*}            [*}            [*]
===========================================================================================================
                       TOTAL           [*]            [*]            [*]            [*]         $1,500,000
-----------------------------------------------------------------------------------------------------------
</TABLE>

-----
* Confidential

                                  Page 8 of 8

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