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                                                                   Exhibit 10.13

                                  H Power Corp.

                            STOCK PURCHASE AGREEMENT

      This Agreement (the "Agreement") is made and entered into as of the 25th
day of August, 1999, between H Power Corp. ("H Power"), a Delaware corporation
(the "Company"), and ECO Fuel Cells, LLC ("ECO LLC"), a Delaware limited
liability company (the "Investor").

      For good and valuable consideration, the receipt and adequacy of which are
hereby acknowledged, the Company and the Investor agree as follows:

      1. Sale and Purchase of Shares. Subject to the terms and conditions
hereof, the Company agrees to sell to the Investor, and the Investor agrees to
purchase from the Company on the Closing Date (as defined in Section 2 hereof),
one million shares (the "Shares") of common stock, $0.001 par value, of the
Company (the "Common Stock") at a purchase price of Fifteen U.S. Dollars
($15.00) per share.

      2.    Closing.

            (a) The initial closing (the "Initial Closing") shall take place at
the offices of National Utilities Cooperative Finance Corporation, 2201
Cooperative Way, Herndon, Virginia, on August 25, 1999 or at such other place or
different day as may be mutually acceptable to the Investor and the Company.

            (b) The final closing and funding (the "Closing") shall take place
at the offices of National Utilities Cooperative Finance Corporation, 2201
Cooperative Way, Herndon, Virginia, on August 27, 1999 (the "Closing Date"), or
such other date as mutually agreed upon by the parties, but in no event shall
the Closing be after September 30, 1999. At the Closing, the Company will
deliver to the Investor a certificate, dated the Closing Date, representing the
Shares purchased by Investor on the Closing Date, registered in its name against
payment to the Company of the purchase price of the Shares.

      3. Representations and Warranties by the Company. In order to induce the
Investor to enter into this Agreement and to purchase the Shares, the Company
hereby represents and warrants to the Investor that as of the Closing and except
as disclosed in the attached Exhibit A:

            3.1 Organization, Standing, etc. The Company is a corporation duly
organized, validly existing and in good standing under the laws of the state of
Delaware, and has the requisite corporate power and authority to own or lease
its properties and assets and to carry on its business in all material respects
as it is now being conducted. The Company has the requisite corporate power and
authority to issue the Shares and to otherwise perform its obligations under
this Agreement.


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            3.2 Governing Instruments. The copies of the Certificate of
Incorporation and bylaws of the Company which have been delivered to legal
counsel for the Investor prior to the execution of this Agreement are true and
complete copies of the duly and legally adopted Certificate of Incorporation and
bylaws of the Company in effect as of the date of this Agreement.

            3.3 Subsidiaries, Etc. Except as disclosed on Exhibit A, the Company
does not have any direct or indirect ownership interest in any corporation,
partnership, joint venture, association or other business enterprise. If any
entity is listed on Exhibit A (each such entity a "Subsidiary") and the Company
owns a controlling interest in such entity, each of the representations and
warranties set forth in this Section 3 are being hereby restated with respect to
such entity (modified as appropriate to the nature of such entity).

            3.4 Qualification. The Company is duly qualified, licensed or
domesticated as a foreign corporation in good standing in each jurisdiction
wherein the nature of its activities or the properties owned or leased by it
makes such qualification, licensing or domestication necessary and in which
failure to so qualify or be licensed or domesticated would have a material
adverse impact upon its business.

            3.5 Financial Statements. Attached to this Agreement as Exhibit B
are (a) a balance sheet, as at May 31, 1998 for the Company, together with the
related statements of income and retained earnings and changes in financial
position for the fiscal year then ended, which balance sheet and related
statements have been audited by Price Waterhouse Coopers, LLC, and (b) an
unaudited balance sheet, as at May 31, 1999 for the Company, together with the
related statement of income and retained earnings for the fiscal year then
ended. Such financial statements, subject to year-end audited adjustments (i)
are in accordance with the books and records of the Company, (ii) present fairly
the financial condition of the Company at the balance sheets dates and the
results of its operations for the periods therein specified, and (iii) have been
(or will be, as applicable) prepared in accordance with generally accepted
accounting principles applied on a basis consistent with prior accounting
periods. Without limiting the generality of the foregoing, the balance sheets or
notes thereto disclose all of the debts, liabilities and obligations of any
nature (whether absolute, accrued or contingent and whether due or to become
due) of the Company at May 31, 1998, and May 31, 1999, which, individually or in
the aggregate, are material and which in accordance with generally accepted
accounting principles would be required to be disclosed in such balance sheets,
and include appropriate reserves for all taxes and other liabilities accrued as
of such dates but not yet payable.

            3.6 Tax Returns and Audits. All required federal, state and local
tax returns or appropriate extension requests of the Company have been filed,
and all federal, state and local taxes required to be paid with respect to such
returns have been paid or due provision for the payment thereof has been made.
The Company is not delinquent in the payment of any such tax or in the payment
of any assessment or governmental charge. The Company has not received notice of
any tax deficiency proposed or assessed against it, and it has not executed any
waiver of any statute of limitations on the assessment or collection of any tax.
The Company has not received notice that any of the Company's tax returns has
been audited by governmental


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authorities. The Company does not have any tax liabilities except those
reflected on Exhibit B or those incurred in the ordinary course of business
since May 31, 1999.

            3.7 Changes, Dividends, etc. Except for the transactions
contemplated by this Agreement, since May 31, 1999, the Company has not: (i)
incurred any debts, obligations or liabilities, absolute, accrued or contingent
and whether due or to become due, except current liabilities incurred in the
ordinary course of business which (individually or in the aggregate) will not
materially and adversely affect the business, properties or prospects of the
Company; (ii) paid any obligation or liability other than, or discharged or
satisfied any liens or encumbrances other than those securing, current
liabilities, in each case in the ordinary course of business; (iii) declared or
made any payment to or distribution to its shareholders as such, or purchased or
redeemed any of its shares of capital stock, or obligated itself to do so; (iv)
mortgaged, pledged or subjected to lien, charge, security interest or other
encumbrance any of its assets, tangible or intangible, except in the ordinary
course of business; (v) sold, transferred or leased any of its assets except in
the ordinary course of business; (vi) suffered any physical damage, destruction
or loss (whether or not covered by insurance) materially and adversely affecting
the properties, business or prospects of the Company; (vii) entered into any
transaction other than in the ordinary course of business; (viii) encountered
any labor difficulties or labor union organizing activities; (ix) issued or sold
any shares of capital stock or other securities or granted any options,
warrants, or other purchase rights with respect thereto other than pursuant to
this Agreement; (x) made any acquisition or disposition of any material assets
or became involved in any other material transaction, other than for fair value
in the ordinary course of business; (xi) increased the compensation payable, or
to become payable, to any of its directors or employees, or made any bonus
payment or similar arrangement with any directors or employees or increased the
scope or nature of any fringe benefits provided for its employees or directors;
or (xii) agreed to do any of the foregoing other than pursuant hereto. There has
been no material adverse change in the financial condition, operations, results
of operations or business of the Company since May 31, 1999.

            3.8 Title to Properties and Encumbrances. Except as otherwise set
forth in Exhibit A, and except for properties and assets disposed of in the
ordinary course of business since May 31, 1999, the Company has good and
marketable title to all of its properties and assets included in the balance
sheet dated May 31, 1999 and the properties and assets reflected used in the
conduct of its business, which properties and assets are not subject to any
mortgage, pledge, lease, lien, charge, security interest, encumbrance or
restriction, except (a) those which are shown and described on Exhibit B, (b)
liens for taxes and assessments or governmental charges or levies not at the
time due or in respect of which the validity thereof is currently be contested
in good faith by appropriate proceedings, or (c) those which do not materially
affect the value of or interfere with the use made of such properties and
assets.

            3.9. Conditions of Properties. The plant, offices and equipment of
the Company are in good condition and repair, subject to normal wear and tear.

            3.10 Litigation; Governmental Proceedings. There are no legal
actions, suits, arbitrations or other legal, administrative or governmental
proceedings or investigations pending


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or, to the knowledge of the Company, threatened against the Company, or its
properties or business, and the Company is not aware of any facts which are
likely to result in or form the basis for any such action, suit or other
proceeding. The Company is not in default with respect to any judgment, order or
decree of any court or any governmental agency or instrumentality. The Company
has not been threatened with any action or proceeding under any business or
zoning ordinance, law or regulation.

            3.11 Compliance With Applicable Laws and Other Instruments. The
business and operations of the Company have been and are being conducted in all
material respects in accordance with all applicable laws, rules and regulations
of all governmental authorities. Neither the execution nor delivery of, nor the
performance of or compliance with, this Agreement nor the consummation of the
transactions contemplated hereby will, with or without the giving of notice or
passage of time, result in any breach of, or constitute a default under, or
result in the imposition of any lien or encumbrance upon any asset or property
of the Company pursuant to, any Agreement or other instrument to which the
Company is a party or by which it or any of its properties, assets or rights is
bound or affected, and will not violate the Certificate of Incorporation or
bylaws of the Company. The Company is not in violation of its Certificate of
Incorporation or bylaws nor in violation of, or in default under, any lien,
indenture, mortgage, lease, agreement, instrument, commitment or arrangement in
any material respect. The Company is not subject to any restriction which would
prohibit it from entering into or performing its obligations under this
Agreement.

            3.12 Shares, Additional Shares and Adjustment Shares. The Shares,
when issued and paid for pursuant to the terms of this Agreement, any Additional
Shares (as that term is defined in Section 11.1 hereof) and any Adjustment
Shares (as that term is defined in Section 12.1 hereof), when issued to the
Investor pursuant to the terms of this Agreement, will be duly authorized,
validly issued and outstanding, fully paid, nonassessable shares and shall be
free and clear of all pledges, liens, encumbrances and restrictions.

            3.13 Securities Laws. Based in part upon the representations of the
Investor in Section 4, no consent, authorization, approval, permit or order of
or filing with any governmental or regulatory authority is required under
current laws and regulations in connection with the execution and delivery of
this Agreement or the offer, issuance, sale or delivery of the Shares, the
Additional Shares or the Adjustment Shares, other than the qualification
thereof, if required, under applicable state securities laws, which
qualification has been or will be effected by the Company if required. The
Company has not, directly or through an agent, offered the Shares or any similar
securities for sale to, or solicited any offers to acquire such securities from,
persons other than the Investor or other accredited investors. Under the
circumstances contemplated by this Agreement and assuming the accuracy of the
representations of the Investor in Section 4, the offer, issuance, sale and
delivery of the Shares, the Additional Shares and the Adjustment Shares, if any,
will not, under current laws and regulations, require compliance with the
prospectus delivery or registration requirements of the federal Securities Act
of 1933, as amended (the "Securities Act").


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            3.14 Intellectual Property.

            (a) Intellectual Property Assets--The term "Intellectual Property
Assets" includes:

                  (1) the name "H Power," all fictional business names, trading
            names, registered and unregistered trademarks, service marks, and
            applications (collectively, "Marks");

                  (2) all patents, patent applications, and inventions and
            discoveries that may be patentable (collectively, "Patents");

                  (3) all copyrights in both published works and unpublished
            works (collectively, "Copyrights");

                  (4) all know-how, trade secrets, confidential information,
            customer lists, software, technical information, data, process
            technology, plans, drawings, and blue prints (collectively, "Trade
            Secrets"),

in each case owned, used, or licensed by the Company as licensee or licensor.

            (b) Agreements--Exhibit C attached hereto contains a complete and
accurate list and summary description, including any royalties paid or received
by the Company, of all material contracts and agreements relating to the
Intellectual Property Assets to which the Company is a party or by which the
Company is bound, except for any license implied by the sale of a product and
perpetual, paid-up licenses for commonly available software programs with a
value of less than $10,000 under which the Company is the licensee. There is no
outstanding and, to the Company's knowledge, no threatened dispute or
disagreement with respect to any such agreement.

            (c) Know-How Necessary to Conduct the Company's Business

                  (1) To the Company's knowledge, the Intellectual Property
            Assets are all those necessary for the operation of the Company's
            business as it is currently conducted. The Company either owns or
            has licensed sufficient rights to each of the Intellectual Property
            Assets, free and clear of all liens, security interests, charges,
            encumbrances, equities, and other adverse claims, and has the right
            to use without payment to a third party, except for royalties
            described in Exhibit C, all of the Intellectual Property Assets.

                  (2) The Company has a policy that requires all current
            employees of the Company to execute written contracts with the
            Company that assign to the Company all rights to any inventions,
            improvements, discoveries, or information relating to the business
            of the Company, and all of the Company's former and current
            employees have executed such a contract. No employee of the Company


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<PAGE>

            has entered into any contract or agreement that restricts or limits
            in any way the scope or type of work in which the employee may be
            engaged or requires the employee to transfer, assign, or disclose
            information concerning his work to anyone other than the Company.

            (d) Patents

                  (1) Exhibit C contains a complete and accurate list and
            summary description of all Patents. Except as set forth on Exhibit
            C, the Company owns no Patents. The Company has exclusive rights to
            use the Patents that it uses or licenses, in each case free and
            clear of all liens, security interests, charges, encumbrances,
            entities, and other adverse claims except for any royalties
            described in Exhibit C.

                  (2) To the Company's knowledge, all of the Patents licensed to
            or used by the Company, are currently in compliance with formal
            legal requirements (including payment of filing, examination, and
            maintenance fees and proofs of working or use), and, to the
            Company's knowledge, are valid and enforceable.

                  (3) No Patent has been or is now involved in any interference,
            reissue, reexamination, or opposition proceeding or has had an
            unfavorable final ruling against its interests in any such
            proceeding. To the Company's knowledge, there is no potentially
            interfering patent or patent application of any third party.

                  (4) To the Company's knowledge, no Patent is infringed or has
            been challenged or threatened in any way. To the Company's
            knowledge, none of the products manufactured and sold, nor any
            process or know-how used, by the Company infringes or is alleged to
            infringe any patent or other proprietary right of any other person.

                  (5) All products made, used, or sold under the Patents have
            been marked in compliance with 35 United States Code ss. 287 and the
            comparable requirements of any jurisdiction in which the products
            are made, used or sold.

            (e) Trademarks

                  (1) The Company is the owner of all right, title, and interest
            in and to each of its Marks, free and clear of all liens, security
            interests, charges, encumbrances, equities, and other adverse
            claims.

                  (2) All Marks that have been registered with the United States
            Patent and Trademark Office are currently in compliance with all
            formal legal requirements (including the timely post-registration
            filing of affidavits of use and incontestability and renewal
            applications), and, to the Company's knowledge, are valid and
            enforceable.


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                  (3) No Mark has been or is now involved in any opposition,
            invalidation, or cancellation and, to the Company's knowledge, no
            such action is threatened with the respect to any of the Marks.

                  (4) To the Company's knowledge, there is no potentially
            interfering trademark or trademark application of any third party.

                  (5) To the Company's knowledge, no Mark is infringed or has
            been challenged or threatened in any way. To the Company's
            knowledge, none of the Marks used by the Company infringes or is
            alleged to infringe any trade name, trademark, or service mark of
            any third party.

                  (6) All products and materials containing a Mark marking in
            compliance with 15 United States Code ss. 1111 or the comparable
            requirements of any jurisdiction in which such products and
            materials are sold.

            (f) Copyrights

                  (1) The Company is the owner of all right, title, and interest
            in and to each of its copyrights, free and clear of all liens,
            security interests, charges, encumbrances, equities, and other
            adverse claims.

                  (2) All the Copyrights are currently in compliance with legal
            requirements and are, to the Company's knowledge, valid and
            enforceable.

                  (3) No Copyright is infringed or, to the Company's knowledge,
            has been challenged or threatened in any way. To the Company's
            knowledge, none of the subject matter of any of the Copyrights
            infringes or is alleged to infringe any copyright of any third party
            or is a derivative work based on the work of a third party.

            (g) Trade Secrets

                  (1) The Company has taken reasonable precautions to protect
            the confidentiality and value of the Trade Secrets.

                  (2) The Company either owns or has licensed the rights to use
            the Trade Secrets that are necessary and sufficient for the
            operation of the Company's business as it is currently conducted. To
            the Company's knowledge, those Trade Secrets that are not part of
            the public knowledge or literature have not been used, divulged, or
            appropriated either for the benefit of any person or to the
            detriment of the Company.


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<PAGE>

                  (3) The Company has not been charged with misappropriation of
            know-how or trade secrets. To the Company's knowledge, no third
            party has misappropriated or attempted to misappropriate the Trade
            Secrets.

            3.15 Capital Stock.

            (a) At the date hereof, the authorized capital stock of the Company
      consists of 20,000,000 shares of Common Stock and 1,800,000 shares of
      Preferred Stock, $0.01 par value (the "Preferred Stock"), of which 200,000
      shares are designated as Series A Convertible Preferred Stock (the "Series
      A Stock"), 400,000 shares are designated as Series B Convertible Preferred
      Stock (the "Series B Stock"), and 1,200,000 shares are designated as
      Series C Convertible Preferred Stock (the "Series C Stock"). As of the
      date hereof, 200,000 shares of Series A Stock are issued and outstanding,
      400,000 shares of Series B Stock are issued and outstanding, 600,000
      shares of Series C Stock are issued and outstanding and 5,803,039 shares
      of Common Stock are issued and outstanding. All of the outstanding shares
      of the Company were duly authorized, validly issued and are fully paid and
      nonassessable. Except as set forth in Exhibit A, there are no outstanding
      subscriptions, options, warrants, calls, contracts, demands, commitments,
      convertible securities or other agreements or arrangements of any
      character or nature whatever, other than this Agreement, under which the
      Company is obligated to issue any securities of any kind representing an
      ownership interest in the Company. Exhibit A contains a complete and
      accurate description of all outstanding subscriptions, options, warrants,
      calls, contracts, demands, commitments, convertible securities or other
      agreements or arrangements of any character or nature whatever, other than
      this Agreement, under which the Company is obligated to issue any
      securities of any kind representing an ownership interest in the Company.
      Neither the offer nor the issuance or sale of the Shares constitutes an
      event, under any anti-dilution provisions of any securities issued or
      issuable by the Company or any agreements with respect to the issuance of
      securities by the Company, which will either increase the number of shares
      issuable pursuant to such provisions or decrease the consideration per
      share to be received by the Company pursuant to such provisions. No holder
      of any security of the Company is entitled to any preemptive or similar
      rights to purchase any securities of the Company from the Company;
      provided, however, that nothing in this section shall affect, alter or
      diminish any right granted to the Investor in this Agreement. All
      outstanding securities of the Company have been issued in full compliance
      with an exemption or exemptions from the registration and prospectus
      delivery requirements of the Securities Act and from the registration and
      qualification requirements of all applicable state securities laws.

            (b) Upon consummation of the transactions contemplated herein, the
      authorized capital stock of the Company shall consist of 20,000,000 shares
      of Common Stock, of which 6,803,039 shares are issued and outstanding, and
      1,800,000 shares of Preferred Stock, of which 200,000 shares of Series A
      Stock, 400,000 shares of Series B Stock and 600,000 shares of Series C
      Stock are issued and outstanding.


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            3.16 Outstanding Debt. The Company does not have any material
indebtedness incurred as the result of a direct borrowing of money, including,
but not limited to, indebtedness with respect to trade accounts, except as set
forth in Exhibit B. The Company is not in default in the payment of the
principal of or interest or premium on any such indebtedness, and no event has
occurred or is continuing under the provisions of any instrument, document or
agreement evidencing or relating to any such indebtedness which with the lapse
of time or the giving of notice, or both, would constitute an event of default
thereunder.

            3.17 Schedule of Assets and Contracts. Attached as Exhibit D are
schedules listing the following items:

            (a) Schedule 1: a true and complete description of all real
      properties owned by the Company;

            (b) Schedule 2: each indenture, lease, sublease, license or other
      instrument under which the Company claims or holds a leasehold interest in
      real property;

            (c) Schedule 3: each lease of personal property involving payments
      remaining to or from the Company in excess of 100,000;

            (d) Schedule 4: each written or oral contract, agreement,
      subcontract, purchase order, commitment or arrangement involving payments
      remaining to or from the Company in excess of $25,000 and each other
      agreement material to the Company's business to which the Company is a
      party or by which it is bound, under which full performance (including
      payment) has not been rendered by any party thereto;

            (e) Schedule 5: any collective bargaining agreements, employment
      agreements, consulting agreements, noncompetition agreements,
      nondisclosure agreements, executive compensation plans, profit sharing
      plans, bonus plans, deferred compensation agreements, employee pension
      retirement plans and employee benefit stock option or stock purchase plans
      and other employee benefit plans, entered into or adopted by the Company;

            (f) Schedule 6: the name of each executive officer of the Company
      and the remuneration currently payable to each such executive officer; and

            (g) Schedule 7: any royalty or license agreement relating to
      software, except for paid-up licenses for commonly available software
      programs with a value of less than $10,000 under which the Company is the
      licensee.

            Prior to the Closing Date, the Company shall provide legal counsel
for the Investor with a true and complete copy of each document referred to on
such schedules which such counsel requests to examine.


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<PAGE>

            The Company has in all material respects substantially performed all
obligations required to be performed by it to date and is not in default in any
material respect under any of the contracts, agreements, leases, documents,
commitments or other arrangements to which it is a party or by which it is
otherwise bound. All instruments referred to in the Schedules described in this
Section 3.17 are in effect and enforceable according to their respective terms,
and there is not under any of such instruments any existing material default or
event of default or event which, with notice or lapse of time or both, would
constitute an event of default thereunder. All parties having material
contractual arrangements with the Company are in substantial compliance
therewith and none are in material default in any respect thereunder. All plans
or arrangements listed on Schedule 5 are fully funded to the extent that such
funding is required by generally accepted accounting principles.

            3.18 Corporate Acts and Proceedings. This Agreement has been duly
authorized by all necessary corporate and shareholder action on behalf of the
Company, has been duly executed and delivered by authorized officers of the
Company, and is a valid and binding agreement on the part of the Company that is
enforceable against the Company in accordance with its terms, except as the
enforceability thereof may be limited by bankruptcy, insolvency, moratorium,
reorganization or other similar laws affecting the enforcement of creditors'
rights generally and to judicial limitations on the enforcement of the remedy of
specific performance and other equitable remedies. All corporate and shareholder
action necessary to the authorization, creation, issuance and delivery of the
Shares, the Adjustment Shares and the Additional Shares has been taken by the
Company, or will be taken by the Company on or prior to the Closing Date.

            3.19 Accounts Receivable. To the extent that they exceed the
reserves for doubtful accounts set forth in Exhibit B, the accounts receivable
which are reflected in Exhibit B and all accounts receivable of the Company
which have arisen since May 31, 1999 (except such accounts receivable as have
been collected since May 31, 1999) are valid and enforceable claims, and the
goods and services sold and delivered which gave rise to such accounts were sold
and delivered in conformity with the applicable purchase orders, agreements and
specifications. Such accounts receivable are subject to no valid defense or
offsets except routine customer complaints or warranty demands of an immaterial
nature. The reserve for doubtful accounts that is included in Exhibit B is
adequate.

            3.20 Inventories. The inventories of the Company which are reflected
in Exhibit B and all inventory items which have been acquired since May 31, 1999
consist of raw materials, supplies, work-in-process and finished goods of such
quality and quantities as are currently usable or salable in the ordinary course
of its business.

            3.21 Purchase Commitments and Outstanding Bids. No material purchase
commitment of the Company is in excess of normal, ordinary and usual
requirements of its business, or was made at any price in excess of the then
current market price, or contains terms and conditions more onerous than those
usual and customary in the industry. There is no outstanding material bid, sales
proposal, contract or unfilled order of the Company which (a) will, or could if
accepted, require the Company to supply goods or services at a cost to the


                                      -10-
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Company in excess of the revenues to be received therefrom, or (b) quotes prices
which do not include a mark-up over reasonably estimated costs consistent with
past mark-ups on similar business or market conditions current at the time.

            3.22 Insurance Coverage. There are in full force policies of
insurance issued by insurers of recognized responsibility insuring the Company
and its properties and business against such losses and risks, and in such
amounts as are required under the terms of the Fuel Cell Operating Agreement (as
defined in Section 5.11 hereof) and to the extent not set forth in the Fuel Cell
Operating Agreement, in such amounts as is customary in the case of corporations
of established reputation in the same or similar business and similarly
situated.

            3.23 No Brokers or Finders. No person, firm or corporation has or
will have, as a result of any act or omission of the Company, any right,
interest or valid claim against the Company or the Investor for any commission,
fee or other compensation as a finder or broker in connection with the
transactions contemplated by this Agreement. The Company will indemnify and hold
the Investor harmless against any and all liability with respect to any such
commission, fee or other compensation which may be payable or determined to be
payable in connection with the transactions contemplated by this Agreement.

            3.24 Conflicts of Interest. No officer, director or shareholder of
the Company or any affiliate (as such term is defined in Rule 405 under the
Securities Act) of any such person has any direct or indirect interest (a) in
any entity which does business with the Company, (b) in any property, asset or
right which is used by the Company in the conduct of its business, or (c) in any
contractual relationship with the Company other than as an employee. For the
purpose of this section, there shall be disregarded any interest which arises
solely from the ownership of less than a 1% equity interest in a corporation
whose stock is regularly traded on any national securities exchange or in the
over-the-counter market.

            3.25 Licenses. The Company possesses from the appropriate agency,
commission, board and government body and authority, whether state, local or
federal, all licenses, permits, authorizations, approvals, franchises and rights
which (a) are necessary for it to engage in the business currently conducted by
it, and (b) if not possessed by the Company would have an adverse impact on the
Company's business. The Company has no knowledge that would lead it to believe
that it will not be able to obtain all licenses, permits, authorizations,
approvals, franchises and rights that may be required for any business the
Company proposes to conduct.

            3.26 Disclosure. The Company has not knowingly withheld from the
Investor any material facts relating to the assets, business, operations,
financial condition or prospects of the Company. No representation or warranty
in this Agreement or in any certificate, schedule, statement or other document
furnished or to be furnished to the Investor pursuant hereto or in connection
with the transactions contemplated hereby contains or will contain any untrue
statement of a material fact or omits or will omit to state any material fact
required to be stated herein or therein or necessary to make the statements
herein or therein not misleading.


                                      -11-
<PAGE>

            3.27 Registration Rights. Other than under this Agreement or as set
forth in Exhibit A, the Company has not agreed to register any of its authorized
or outstanding securities under the Securities Act.

            3.28 Retirement Plans. The Company does not have any retirement plan
in which any employees of the Company participate that is subject to any
provisions of the Employee Retirement Income Security Act of 1974 and of the
regulations adopted pursuant thereto ("ERISA"). Exhibit A contains all
information regarding employee benefit plans that is material to the business,
operations and financial condition of the Company.

            3.29 Environmental and Safety Laws. The Company is not knowingly in
violation of any applicable statute, law or regulation relating to the
environment or occupational health and safety, and no material expenditures are
or will be required in order to comply with any such existing statute, law or
regulation.

            3.30 Employees. To the best of the Company's knowledge, no officer
of the Company or employee of the Company (whose annual compensation is in
excess of $100,000) has any plans to terminate his or her employment with the
Company. The Company has complied in all material respects with all laws
relating to the employment of labor, including provisions relating to wages,
hours, equal opportunity, collective bargaining and payment of Social Security
and other taxes, and the Company has not encountered any material labor
difficulties. The Company does not have any worker's compensation liabilities,
except those reflected on Exhibit B.

            3.30 Absence of Restrictive Agreements. Except as provided in
Exhibit A, no employee of the Company is subject to any secrecy or
non-competition agreement or any agreement or restriction of any kind that would
impede in any way the ability of such employee to carry out fully all activities
of such employee in furtherance of the business of the Company.

            3.31 Material Contracts. Each of the contracts set forth on Schedule
4 prepared in accordance with Section 3.17 hereof is in full force and effect
and constitutes a valid and binding obligation of the Company and, to the
Company's knowledge, the other party thereto.

            3.32 Actions and Proceedings. Exhibit A contains a complete and
accurate description of all legal action or other claims asserted against the
officers and directors of the Company, whether civil, criminal, administrative,
arbitral or otherwise, including diciplinary actions by any professional
association and regardless of whether such legal or other actions relate to
activities of the Company's officers and directors prior to becoming an officer
or director of the Company, and regardless of the disposition or settlement of
such actions or proceedings.

      4. Representations of the Investor. The Investor represents that:

            4.1 Investment Intent. The Shares being acquired by the Investor are
being purchased for investment for the Investor's own account and not with the
view to, or for resale in


                                      -12-
<PAGE>

connection with, any distribution or public offering thereof. The Investor
understands that the Shares have not been registered under the Securities Act or
any state securities laws and that the Shares may not be transferred or resold
without (i) registration under the Securities Act and any applicable state
securities laws, or (ii) an exemption from the requirements of the Securities
Act and applicable state securities laws.

            4.2 Acts and Proceedings. This Agreement has been duly authorized by
all necessary action on the part of the Investor, has been duly executed and
delivered by the Investor, and is a valid and binding agreement of the Investor.

            4.3 No Brokers or Finders. No person, firm or corporation has or
will have, as a result of any act or omission by the Investor, any right,
interest or valid claim against the Company for any commission, fee or other
compensation as a finder or broker, or in any similar capacity, in connection
with the transactions contemplated by this Agreement. The Investor will
indemnify and hold the Company harmless against any and all liability with
respect to any such commission, fee or other compensation which may be payable
or determined to be payable as a result of the actions of the Investor in
connection with the transactions contemplated by this Agreement.

            4.4 Best Efforts. Investor shall use its best efforts to assist the
Company in preparing an initial public offering of shares of Common Stock.

            4.5 Accredited Investor. Investor qualifies as an "accredited
investor" for purposes of Regulation D promulgated under the Securities Act of
1933, as amended.

      5. Conditions of Investor's Obligation. The obligation to purchase and pay
for the Shares which the Investor has agreed to purchase on the Closing Date is
subject to the fulfillment prior to or on the Closing Date of the conditions set
forth in this Section 5. In the event that any such condition is not fulfilled
to the satisfaction of the Investor, then the Investor shall not be obligated to
proceed with the purchase of the Shares.

            5.1 No Errors, etc. The representations and warranties of the
Company under this Agreement shall be true in all material respects as of the
Closing Date with the same effect as though made on and as of the Closing Date.

            5.2 Compliance with Agreement. The Company shall have performed and
complied with in all material respects all agreements or conditions required by
this Agreement to be performed and complied with by it prior to or as of the
Closing Date.

            5.3 Certificate of Officers. The Company shall have delivered to the
Investor a certificate, dated the Closing Date, executed by the Chief Executive
Officer of the Company and certifying to the satisfaction of the conditions
specified in sections 5.1 and 5.2.


                                      -13-
<PAGE>

            5.4 Opinion of the Company's Counsel. The Company shall have
delivered to the Investor an opinion, satisfactory to the Investor, of Fulbright
& Jaworski, L.L.P., counsel for the Company, dated the Closing Date, to the
effect that:

            (a) The Company is a corporation duly organized and validly existing
      in good standing under the laws of the state of Delaware, and has the
      corporate power and authority to own and hold the properties owned and
      leased by it and to carry on the business in which it is engaged. The
      Company has the corporate power and authority to enter into this
      Agreement, to issue and sell the Shares and to carry out the provisions of
      this Agreement.

            (b) This Agreement has been duly authorized, executed and delivered
      by the Company, is the legal, valid and binding agreement of the Company
      and is enforceable against the Company in accordance with its terms,
      subject, as to the enforcement of remedies, to limitations under
      applicable bankruptcy, insolvency, moratorium, reorganization, and other
      laws affecting the rights of creditors generally and to judicial
      limitations on the enforcement of the remedy of specific performance and
      other equitable remedies.

            (c) The Shares being purchased on the Closing Date have been duly
      authorized and, upon delivery thereof and payment therefore in accordance
      with the Stock Purchase Agreement will be fully paid and nonassessable,
      and are entitled to the rights, preferences and provisions of the
      Company's Certificate of Incorporation and the benefits of the provisions
      of this Agreement applicable thereto. The certificate evidencing the
      Shares is in valid and sufficient form under Delaware law.

            (d) All corporate proceedings required by law or by the provisions
      of this Agreement to be taken by the Board of Directors and shareholders
      of the Company on or prior to such Closing Date in connection with the
      execution and delivery of this Agreement, the offer, issuance and sale of
      the Shares and the consummation of the transactions contemplated by this
      Agreement, have been duly and validly taken.

            (e) The Company is authorized by its Certificate of Incorporation to
      issue 20,000,000 shares of Common Stock and 1,800,000 shares of Preferred
      Stock. Immediately prior to the Closing Date there were 5,803,039 shares
      of Common Stock, 200,000 shares of Series A Stock, 400,000 shares of
      Series B Stock and 600,000 shares of Series C Stock issued and
      outstanding. All shares outstanding immediately prior to the Closing Date
      have been duly authorized and validly issued. To the best of such
      counsel's knowledge, the Company holds no shares in its treasury. Except
      for shares of Common Stock and shares of Series A Stock, Series B Stock
      and Series C Stock, the Company has no other authorized series or class of
      capital stock and, to the best of such counsel's knowledge, has no
      outstanding options, warrants or other rights to acquire securities of the
      Company, other than as disclosed in Exhibit A to this Agreement.


                                      -14-
<PAGE>

            (f) To the best of such counsel's knowledge, no security holder of
      the Company is entitled to preemptive or similar rights as a result of the
      execution or delivery of this Agreement or the issuance of the Shares and
      the Adjustment Shares other than as expressly set forth in this Agreement.

            (g) Assuming the accuracy of the representations made by the
      Investor in Section 4, the Company has obtained the approval or consent of
      all governmental agencies or bodies required for the legal and valid
      execution and delivery of this Agreement and the legal and valid offer,
      issuance and sale of the Shares and for the performance of the obligations
      of the Company under all provisions of this Agreement, other than those
      with respect to registration rights. Assuming the accuracy of the
      representations made by the Investor in Section 4, the execution, delivery
      and performance of this Agreement, the offer, issuance and sale of the
      Shares and the issuance of Adjustment Shares, and the consummation of the
      transactions contemplated by this Agreement will not result in any breach
      or violation of the terms or provisions of, or constitute a default under,
      the Certificate of Incorporation or the bylaws of the Company or any
      statute, rule or regulation affecting the Company or its business. To the
      best of such counsel's knowledge, the execution, delivery and performance
      of this Agreement by the Company, the offer, issuance and sale of the
      Shares and the consummation of the transactions contemplated by this
      Agreement will not result in any violation of any agreement or other
      instrument to which the Company is a party or by which it is bound or to
      which any of its properties, assets or business is subject or any
      judgment, decree or order.

            (h) Assuming the accuracy of the representations made by the
      Investor in Section 4, the offer, sale, issuance and delivery of the
      Shares to the Investor under this Agreement are exempt from the
      registration and prospectus delivery requirements of the Securities Act
      and all applicable state securities laws.

            (i) Except for matters disclosed on Exhibit A, such counsel has no
      knowledge of any litigation, proceeding or governmental investigation
      pending or threatened against the Company or its properties or business.

            5.5 Opinion of Intellectual Property. The Company shall have
delivered to Investor an opinion, satisfactory to the Investor, of Salzman &
Levy, intellectual property counsel for the Company, dated the Closing Date to
the effect that:

            (a) The material references in Section 3.14 of the Stock Purchase
      Agreement do not contain any untrue statement of a material fact or omit
      to state a material fact so as to make the statements therein, in light of
      the circumstances under which they were made, misleading.

            (b) Except as described in the Stock Purchase Agreement, there are
      no United States patents of third parties which are infringed by the
      manufacture, use or sale of the products or processes currently made, used
      or sold by the Company.


                                      -15-
<PAGE>

            (c) There are no legal, governmental or administrative proceedings
      pending or threatened against the Company that relate to patents,
      trademarks or other intellectual property, except for pending or proposed
      United States or foreign patent or trademark applications.

            (d) The Company has not received any notice of conflict with the
      asserted rights of others in respect of any trademarks, service marks,
      trade names, trademark registrations, service mark registrations,
      copyrights, licenses, inventions, trade secrets, patents, patent
      applications, know-how or similar rights, nor of any threatened actions
      with respect thereto, which, if determined adversely to the Company, would
      individually or in the aggregate have a material adverse affect on the
      business affairs, financial position, net worth or operations of the
      Company.

            (e) The Company owns or has licensed all such material trademarks,
      trademark applications, trademark registrations, service marks, service
      mark registrations, copyrights, patents, patent applications and other
      rights as are described in the Stock Purchase Agreement and which are
      necessary and sufficient for the Company's present or planned future
      business as described in the Stock Purchase Agreement of Fuel Cell
      Operating Agreement.

            (f) The patents described in Exhibit C of the Stock Purchase
      Agreement are valid and enforceable.

            5.6 Supporting Documents. The Investor shall have received the
following:

            (a) A copy of resolutions of the Board of Directors of the Company
      certified by the Secretary of the Company authorizing and approving the
      execution, delivery and performance of this Agreement and expansion of the
      Company's Board of Directors as required under Section 6.1 of this
      Agreement.

            (b) A certificate of incumbency executed by the Secretary of the
      Company certifying the names, titles and signatures of the officers
      authorized to execute this Agreement and further certifying that the
      Certificate of Incorporation and bylaws of the Company delivered to legal
      counsel for the Investor at the time of the execution of this Agreement
      have been validly adopted and have not been amended or modified.

            (c) Such additional supporting documentation and other information
      with respect to the transactions contemplated hereby as legal counsel for
      the Investor may reasonably request.

            5.7 Qualification Under State Securities Laws. All registrations,
qualifications, permits and approvals required under applicable state securities
laws for the lawful execution and delivery of this Agreement and the offer,
sale, issuance and delivery of the Shares to the Investor at the Closing shall
have been obtained.


                                      -16-
<PAGE>

            5.8 Board of Directors. The Company shall have taken such actions as
shall be appropriate to reconstitute its Board of Directors in the manner
contemplated by Section 6.1 of this Agreement.

            5.9 Due Diligence. Investor shall have completed its due diligence
investigation of the Company to its satisfaction and Investor determines there
are no material impediments to consummation of the transactions contemplated
herein.

            5.10 Timing. The transactions contemplated by this Agreement are
consummated prior to any initial public offering of the Company's stock.

            5.11 Fuel Cell Operating Agreement; Addendum Agreement. The parties
hereto have signed that certain Fuel Cell Operating Agreement, dated as of July
29, 1999 (the "Fuel Cell Operating Agreement) and the Addendum Agreement
relating thereto, and said Fuel Cell Operating Agreement and Addendum Agreement
are in full force and effect in accordance with their terms as of the Closing
Date.

            5.12 Necessary Consents. On or before the Closing Date, the Company
shall have obtained any consents of any person or governmental authority
necessary for the consummation of the transactions contemplated under this
Agreement and the Investor shall have received satisfactory evidence of such
consents.

            5.13 No Material Adverse Effect. Since May 31, 1999 no event, change
or effect shall have occurred that is materially adverse to the consolidated
financial condition, business, results of operations, cash flows or prospects of
the Company or that materially impairs the ability of the Company to perform or
the Investor to enforce the obligations of the Company under this Agreement.

            5.14. Proceedings and Documents. All corporate and other proceedings
and actions taken in connection with the transactions contemplated hereby and
all certificates, opinions, agreements, instruments and documents mentioned
herein or incident to any such transaction shall be satisfactory in form and
substance to legal counsel for the Investor.

            5.15 Other Agreements. The Company shall have delivered the
following executed documents to Investor: (i) Consent in the form of Exhibit E
attached hereto executed by Sofinov Societe Financiere D'Innovation, Inc.; (ii)
Agreement in the form of Exhibit F attached hereto executed by the Company and H
Power Enterprises of Canada; and (iii) First Amendment to Technology Licensing
Agreement in the form of Exhibit G attached hereto executed by the Company and H
Power Enterprises of Canada, Inc.

            5.16. Patent Validity Opinion. The Investor shall have received a
patent validity opinion acceptable to Investor from Salzman & Levy, intellectual
property counsel for the Company, to the effect that none of the Company's
products or proposed products, including the Fuel Cell System (as defined in the
Fuel Cell Operating Agreement referred to in Section 5.11


                                      -17-
<PAGE>

hereof) infringe upon U.S. Patent 5,879,826 to Lehman, et. al, Proton Exchange
Membrane Fuel Cell, assigned to Humboldt State University Foundation.

      6. Affirmative Covenants of the Company. Subject to the provisions of
Section 11, the Company covenants and agrees as follows:

            6.1 Representation on Board of Directors; Directors' and
Shareholders' Meetings. From and after the Closing Date, the Investor shall be
entitled to one (1) seat on the Board of Directors of the Company (the "ECO
Director"). In the event of the death, resignation or removal of the ECO
Director, the Investor shall be entitled to designate such director's successor.
The Company agrees, as a general practice, to hold meetings of its Board of
Directors at least once every calendar quarter, and during each year to hold its
annual meeting of shareholders on or approximately on the date provided in its
bylaws. The Company shall reimburse the Investor for the reasonable
out-of-pocket travel expenses incurred by the ECO Director designated as
provided in this Section 6.1 in connection with attending meetings or otherwise
fulfilling his or her fiduciary responsibilities as a director, and shall
maintain a provision in its bylaws providing for the indemnification of its
directors to the full extent permitted by the law of the State of Delaware.

            6.2 The Company shall at all times maintain an audit committee and a
compensation committee consisting of at least three (3) members of the Board of
Directors.

            6.3 Within thirty (30) days of the Closing Date, the Company shall
have amended its bylaws to provide a Board seat for Investor as described in the
first two sentences of Section 6.1 hereof, said amendment to include a provision
that subsequent amendment of the Company's bylaws with respect to the number or
designation of directors may not be subsequently amended without the unanimous
approval of the Board of Directors.

            6.4 Investor's Right to Sell if Company Shareholders Sell. In the
event that Company stockholders holding a majority of the outstanding Common
Stock (the "Majority Shareholders") enter into an agreement to sell their shares
of Common Stock to a third party (the "Proposed Sale"), the Company shall
provide notice of the Proposed Sale to Investor within fifteen (15) days after
notice of the Proposed Sale was received by the Company stating the terms and
conditions of the Proposed Sale, including, without limitation, the number of
shares proposed to be sold or transferred, the nature of such sale or transfer,
the consideration to be paid, and the name and address of each prospective
purchaser. Investor shall have the right, exercisable upon written notice to the
Company within fifteen (15) days of receipt of notice of the Proposed Sale by
the Company, to participate in the Proposed Sale pursuant to the specified terms
and conditions of the proposed sale as set forth in the notice (the "Take-Along
Right"). To the extent Investor exercises the Take-Along Right, the number of
shares the Majority Shareholders may sell pursuant to the Purchase Offer shall
be reduced as provided herein.

            (a) Each shareholder participating in the Proposed Sale may sell all
      or any part of that number of shares of Common Stock equal to the product
      obtained by multiplying (i) the aggregate number of shares of Common Stock
      covered by the Purchase Offer by


                                      -18-
<PAGE>

      (ii) a fraction, the numerator of which is the number of shares of Common
      Stock at the time owned by such participating shareholder and the
      denominator of which is the sum of (A) the total number of shares of
      Common Stock owned by all participating shareholders (other than Majority
      Shareholders) plus (B) the total number of shares of Common Stock owned by
      the Majority Shareholders.

            6.5 Financial and Business Information. The Company will maintain,
and cause each of its Subsidiaries to maintain, a system of accounting
established in accordance with sound business practices to permit preparation of
financial statements in conformity with generally accepted accounting principles
(GAAP). The Company during the term of this Agreement will, and will cause its
Subsidiaries to, deliver to the Investor:

            (a) As soon as practicable and in any event within 120 days after
      the close of each fiscal year of the Company, a consolidated and
      consolidating balance sheet of the Company and its Subsidiaries as of the
      close of such fiscal year and consolidated statements of operations,
      shareholders' equity and cash flows for the Company and its Subsidiaries
      for the fiscal year then ended, together with the report thereon of
      independent certified public accountants acceptable to Investor;

            (b) As soon as practicable and in any event within 45 days after the
      end of the first three fiscal quarters of each fiscal year, the
      consolidated and consolidating balance sheet of the Company and its
      Subsidiaries as at the end of such fiscal quarter and the related
      consolidated and consolidating statements of operations, shareholders'
      equity and cash flows of the Company and its Subsidiaries for such fiscal
      quarter and for the period from the beginning of the current fiscal year
      to the end of such fiscal quarter, all in reasonable detail and certified
      by the chief financial officer of the Company that they fairly present the
      financial condition of Company and its Subsidiaries as the dates indicated
      and the results of its operations and its cash flows for the periods
      indicated, subject to changes resulting from audit and normal year-end
      adjustments;

            (c) As soon as practicable and in any event within 30 days after the
      end of each month, the internal financial statements of the Company and
      its Subsidiaries for such month (other than the months referred to in
      Section 6.5(a) and Section 6.5(b) above) and certified by the Chief
      Executive Officer of the Company that such statements were prepared in
      accordance with the Company's accounting policies, consistently applied
      for the period indicated;

            (d) Prompt notice of any event having a material adverse effect on
      the business, operations, financial condition, prospects or results of
      operation of the Company;

            (e) Promptly upon their becoming available, copies of (a) all
      financial statements, reports, notices and proxy statements sent or made
      available generally by the Company to its security holders, (b) all
      regular and periodic reports filed by the Company or any of its
      Subsidiaries with any securities exchange or with the SEC or any


                                      -19-
<PAGE>

      governmental or private regulatory authority, (c) all press releases and
      other statements made available generally by the Company or any of its
      Subsidiaries to the public concerning material developments in the
      business of the Company or any of its Subsidiaries;

            (f) Promptly upon any officer of Company or any of its Subsidiaries
      obtaining knowledge of any condition or event that constitutes a violation
      or default or potential event of default under any indebtedness of the
      Company or any of its Subsidiaries, or becoming aware that any person has
      given any notice or taken any other action with respect to a claimed event
      of default or potential event of default, notice of any such event; and

            (g) Within a reasonable time, such other information about the
      property, financial condition and operations of the Company and its
      Subsidiaries as the Investors may from time to time reasonably request.

            6.6 Patent Protection. With respect to any patents identified on
Exhibit A, the Company shall within thirty (30) days after the Closing Date,
commence protection proceedings for all such patents.

            6.7 Year 2000 Compliance. Within thirty (30) days after the Closing
Date, the Company shall certify to the Investor, compliance with the following:

            (a) The Company has investigated the possibility of the occurrence
      of Year 2000 Errors in its business operations and has: (i) established a
      written plan for dealing with the possibility of Year 2000 Errors and
      provided a copy of such plan to Investor; (ii) obtained confirmation from
      the suppliers of all the material computer systems, hardware, software or
      other processing equipment used in the Company's business that Year 2000
      Errors will not occur or (where such confirmation has not been
      forthcoming) has obtained satisfactory assurances that appropriate
      modification will be made to such systems, hardware, software or equipment
      to test and remedy any and all Year 2000 Errors prior to October 31, 1999;
      (iii) tested the principal computer systems, hardware, software and other
      processing equipment used in the Company's business to determine whether
      Year 2000 Errors are possible; and (iv) compiled an accurate estimate of
      the cost of preventing Year 2000 Errors or dealing with any Year 2000
      Errors which may arise, which estimate has been submitted to the Investor.

            (b) The Company has provided a complete and accurate list of all
      Year 2000 Errors of which the Company, its officers, directors, employees,
      agents or shareholders are aware.

            (c) The products and/or technology manufactured, licensed, sold or
      otherwise distributed by the Company shall function without, and shall not
      contain, any Year 2000 Errors.


                                      -20-
<PAGE>

            (d) None of the software used in the business of, or manufactured,
      licensed, sold or otherwise distributed by, the Company contains any
      virus, logic bomb, time bomb, worm, undisclosed protect codes or other
      harmful code which might have a significant adverse effect on the
      processing of data for the business, or the use of the software.

            (e) For purposes of this Agreement, the term "Year 2000 Error" means
      (i) any failure of computer hardware or software products or technology
      (or any components thereof) properly to create, receive, recognize,
      record, store, process, calculate, present or exchange calendar dates
      falling on and after (and if applicable, spans of time including) January
      1, 2000 (including, without limitation, leap years) as a result of the
      occurrence, or use of data consisting of, such dates; (ii) any failure of
      computer hardware or software products or technology (or any components
      thereof) to create, receive, recognize, record, store, process, calculate,
      present or exchange any information or data dependent on or relating to
      dates on or after January 1, 2000 (including, without limitation, forward
      and backward calculations from, into and between the 20th and 21st
      centuries, the years 1999 and 2000 and leap years) in the same manner, and
      with the same functionality, data integrity and performance, as such
      computer hardware or software products or technology (or any components
      thereof) creates, receives, recognizes, records, stores, processes,
      calculates, presents or exchanges calendar dates on or before December 31,
      1999, or information or data dependent on or relating to such dates; or
      (iii) any loss of functionality or performance or incorrect results with
      respect to the introduction of records or processing of data containing
      dates falling on or after January 1, 2000 (including, without limitation,
      leap years).

      7. Future Registration Rights. Except for any registration expressly
permitted by Section 8 of this Agreement, and except for an underwriting
agreement between the Company and one or more professional underwriters of
securities, the Company shall not, without the prior written consent of the
Investor, grant any registration rights that are greater than the registration
rights of the Investor as set forth in Exhibit E attached hereto.

      8. Registration Rights. The Company acknowledges and agrees that the
Investor shall have the registration rights set forth in Exhibit H attached
hereto.

      9. Restriction on Transfer of Shares.

            9.1 Restrictions. The Shares are only transferable pursuant to (a) a
public offering registered under the Securities Act, (b) Rule 144 of the
Commission (or any similar rule then in effect) if such rule is available, and
(c) subject to the conditions specified elsewhere in this Section 10, any other
legally available means of transfer.

            9.2 Legend. Each certificate representing Shares shall be endorsed
with the following legend:


                                      -21-
<PAGE>

            "The shares represented by this certificate may not be transferred
            without (i) the opinion of counsel satisfactory to this corporation
            that such transfer may lawfully be made without registration under
            the Federal Securities Act of 1933 and all applicable state
            securities laws or (ii) such registration."

            9.3 Removal of Legend. Any legend endorsed on a certificate
evidencing a security pursuant to Section 9.1 hereof shall be removed, and the
Company shall issue a certificate without such legend to the holder of such
security, if such security is being disposed of pursuant to a registration under
the Securities Act or pursuant to Rule 144 or any similar rule then in effect or
if such holder provides the Company with an opinion of counsel satisfactory to
the Company to the effect that a transfer of such security may be made without
registration. In addition, if the holder of such security delivers to the
Company an opinion of such counsel to the effect that no subsequent transfer of
such security will require registration under the Securities Act, the Company
will promptly upon such contemplated transfer deliver new certificates
evidencing such security that do not bear the legend set forth in Section 9.2.

      10. Termination of Certain Covenants.

            (a) The obligations of the Company under Section 6.4 of this
      Agreement shall terminate and shall be of no further force or effect at
      the earlier of (a) the completion of an initial public offering of its
      capital stock to the public pursuant to a registration statement filed
      with and declared effective by the Commission which results in net
      proceeds to the Company of at least $45,000,000 and a per share purchase
      price of at least $15.00, or such lesser gross proceeds or per share
      purchase price as the Investor may agree upon in writing.

            (b) The obligations of the Company under Section 6.5 of this
      Agreement shall terminate and shall be of no further force and effect upon
      completion of an initial public offering by the Company.

      11. Right to Purchase Additional Shares.

            11.1 Right to Purchase Additional Shares. If the Company should
decide to issue and sell additional shares of stock (the "Additional Shares"),
excluding (a) shares of Common Stock sold to the public pursuant to a
registration statement filed under the Securities Act, (b) shares of Common
Stock that may be issued upon the exercise of stock options outstanding as of
the Closing Date and disclosed in Exhibit A; (c) stock options and shares of
Common Stock issuable upon the exercise of such options granted to employees and
directors of the Company pursuant to the terms of the Company's stock option
plans in effect as of the Closing Date and disclosed in Exhibit A; (d) Common
Stock issuable upon the exercise of a warrant in favor of Duquesne Enterprises
that, as of the Closing Date, entitled the holder thereof to purchase 100,000
shares of Common Stock; (e) Common Stock issuable upon the conversion of the
Company's Series A Convertible Preferred Stock, Series B Convertible Preferred
Stock or Series C Convertible Preferred Stock; (f) shares of Preferred Stock, up
to an aggregate maximum of 266,667 shares; and (g) shares of Common Stock in an
amount less than 1% of the shares of


                                      -22-
<PAGE>

Common Stock owned by Investor as of the Closing Date, whether issued in one
transaction or a series of transactions subsequent to the Closing Date, up to a
maximum of 10,000 shares in the aggregate for all such transactions
(collectively "Permitted Issuances"), the Company shall first offer to sell to
Investor, upon the same terms and conditions as the Company is proposing to
issue and sell the Additional Shares to others, Investor's pro rata share (as
defined below) of such Additional Shares.

            Such offer to Investor shall be made by written notice given to
Investor (the "Offer Notice") specifying the amount of the Additional Shares
being offered, the purchase price for the Additional Shares and any other terms
of the offer. Investor shall have a period of thirty (30) days from and after
the date such Offer Notice was received by Investor within which to accept such
offer (the "Acceptance Period"). Investor shall accept an offer to purchase all
or any portion of the Additional Shares specified in the Offer Notice by written
notice to the Company and tender of the purchase price for the Additional Shares
within the Acceptance Period. If Investor fails to accept such offer within the
Acceptance Period, any Additional Shares not purchased by Investor may be
offered for sale to others by the Company for a period of one hundred eighty
(180) days from the last day of the Acceptance Period, but only on the same
terms and conditions as set forth in the Offer Notice delivered to Investor,
free and clear of the restrictions imposed by this Section 11.

            11.2 Pro Rata Share. For purposes of Section 11.1, Purchaser's "pro
rata share" shall be determined by the following formula:

                                   P = N/O x A

Where,

"P" equals Investor's pro rata share of Additional Shares (rounded to the
nearest whole share);

"N" equals the number of shares of Common Stock owned by Investor immediately
prior to the issuance of the Additional Shares being offered;

"O" equals the total number of shares of the Company's Common Stock outstanding
immediately prior to the issuance of the Additional Shares; and

"A" equals the total number of Additional Shares being offered.

            11.3 Termination. Investor's rights under this Section 11 shall
terminate in their entirety on the earlier of (a) the consummation of an initial
public offering of the Company's Common Stock or other securities, or (b) the
acquisition of the Company by another entity by means of any transaction or
series of related transactions (including, without limitation, any
reorganization, merger or consolidation) that results in the transfer of fifty
percent (50%) or more of the outstanding voting power of the Company or a sale
of all or substantially all of the assets of the Company.


                                      -23-
<PAGE>

      12. Anti-dilution.

            12.1 Right to Receive Adjustment Shares. If at any time after the
date of this Agreement, the Company issues or sells, or is deemed to have issued
or sold, any shares of its Common Stock for consideration per share less than
$15.00, then, unless such issuance or sale was a Permitted Issuance (as defined
in Section 11.1 hereof), immediately upon such issue or sale or deemed issuance
or sale, the Company shall issue to Investor a number of Adjustment Shares
determined in accordance with Section 12.2 hereof without payment of any cash or
other consideration to the Company.

            12.2 Calculation of Adjustment Shares. The number of Adjustment
Shares to be issued to Investor under Section 12.1 shall be determined in
accordance with the following formula:

                                   A = C/S - E

Where,

"A"   =     Number of Adjustment Shares

"C"   =     Purchase Price paid by Investor for the Shares ($15,000,000)

"S"   =     per share price of Additional Shares

"E"   =     Number of Shares owned by Investor immediately preceding issuance
            of Additional Shares.

            12.3 Subdivisions and Combinations. In case the Company shall at any
time subdivide or split its outstanding shares of Common Stock into a greater
number of shares, or combine the outstanding shares of Common Stock into a
smaller number of shares, the Company shall issue to Investor a number of
Adjustment Shares sufficient to reflect such stock split or combination.

            12.4 Termination. Investor's rights under this Section 12 shall
terminate in their entirety on the earlier of (a) the consummation of an initial
public offering of the Company's Common Stock or other securities; or (b) the
acquisition of the Company by another entity by means of any transaction or
series of related transactions (including, without limitation, any
reorganization, merger or consolidation) that results in the transfer of fifty
percent (50%) or more of the outstanding voting power of the Company or a sale
of all or substantially all of the assets of the Company.

      13. Survival. Except as specifically provided in Section 10 and Section 12
of this Agreement, all representations, warranties and covenants contained
herein shall survive the execution and delivery of this Agreement, any
investigation at any time made by the Investor or


                                      -24-
<PAGE>

on its behalf, and the sale and purchase of the Shares and payment therefor for
a period of two years. All statements contained in any certificate, instrument
or other writing delivered by or on behalf of the Company pursuant to this
Agreement (other than legal opinions) or in connection with or in contemplation
of the transactions herein contemplated shall constitute representations and
warranties by the Company hereunder.

      14. Indemnification.

            14.1 Indemnification by Company. The Company agrees to indemnify in
full Investor, its officers, directors, employees, agents and stockholders
(collectively, the "Investor Indemnified Parties") and hold them harmless
against any loss, liability, deficiency, damage, expense or cost (including
reasonable legal expenses), whether or not actually incurred or paid prior to
the third anniversary of the Closing Date (collectively, "Losses"), which
Investor Indemnified Parties may suffer, sustain or become subject to, as a
result of (i) any misrepresentation in any of the representations and warranties
of the Company contained in this Agreement or in any exhibits, schedules,
certificates or other documents delivered or to be delivered by or on behalf of
the Company pursuant to the terms of this Agreement or otherwise referenced or
incorporated in this Agreement (collectively, the "Related Documents"), (ii) any
breach of, or failure to perform, any agreement of the Company contained in this
Agreement or any of the Related Documents, or (iii) any "Claims" (as defined in
Section 14.3(a) hereof) or threatened Claims against Investor arising out of the
actions or inactions of the Company or the Company with respect to the Company's
business prior to the Closing (collectively, "Investor Losses").

            The Company shall be liable to the Investor Indemnified Parties for
any Investor Losses only if Investor or another Investor Indemnified Party
delivers to the Company written notice, setting forth in reasonable detail the
identity, nature and amount of Investor Losses related to such claim or claims
prior to the third anniversary of the Closing Date; provided, however, that the
Investor Indemnified Party's failure to provide the detail required by this
Section 15.1 shall not constitute either a breach of this Agreement by the
Investor Indemnified Party or any basis for the Company to assert that the
Investor Indemnified Party did not comply with the terms of this Section 14.1
sufficient to cause the Investor Indemnified Party to have waived its rights
under this Section 15.1.

            14.2 Indemnification by Investor . The Investor agrees to indemnify
in full the Company, and its officers, directors, employees, agents and
stockholders (collectively, the "Company Indemnified Parties") and hold them
harmless against any Losses which any of the Company Indemnified Parties may
suffer, sustain or become subject to as a result of (i) any misrepresentation in
any of the representations and warranties of Investor contained in this
Agreement or in any of the Related Documents, (ii) any breach of, or failure to
perform, any agreement of Investor contained in this Agreement or any of the
Related Documents, or (iii) any Claims or threatened Claims against the Company
arising out of the actions or inactions of Investor with respect to the
Company's business or the Real Property after the Closing (collectively,
"Losses").


                                      -25-
<PAGE>

            Investor shall be liable to the Seller Indemnified Parties for any
Seller Losses (i) only if the Company or another Company Indemnified Party
delivers to Investor written notice, setting forth in reasonable detail the
identity, nature and amount of Company Losses related to such claim or claims
prior to the third anniversary of the Closing Date; provided, however, that the
Company Indemnified Party's failure to provide the detail required in this
Section 14.2 shall not constitute either a breach of this Agreement by the
Company Indemnified Party or any basis for Investor to assert that the Company
Indemnified Party did not comply with the terms of this Section 14.2 sufficient
to cause the Company Indemnified Party to have waived its rights under this
Section 14.2.

            14.3 Method of Asserting Claims. As used herein, an "Indemnified
Party" shall refer to a "Investor Indemnified Party" or "Company Indemnified
Party," as applicable, the "Notifying Party" shall refer to the party hereto
whose Indemnified Parties are entitled to indemnification hereunder, and the
"Indemnifying Party" shall refer to the party hereto obligated to indemnify such
Notifying Party's Indemnified Parties.

            (a) In the event that any of the Indemnified Parties is made a
      defendant in or party to any action or proceeding, judicial or
      administrative, instituted by any third party for the liability or the
      costs or expenses of which are Losses (any such third party action or
      proceeding being referred to as a "Claim"), the Notifying Party shall give
      the Indemnifying Party prompt notice thereof. The failure to give such
      notice shall not affect any Indemnified Party's ability to seek
      reimbursement unless such failure has materially and adversely affected
      the Indemnifying Party's ability to defend successfully a Claim. The
      Indemnifying Party shall be entitled to contest and defend such Claim;
      provided, that the Indemnifying Party (i) has a reasonable basis for
      concluding that such defense may be successful and (ii) diligently
      contests and defends such Claim. Notice of the intention so to contest and
      defend shall be given by the Indemnifying Party to the Notifying Party
      within 20 business days after the Notifying Party's notice of such Claim
      (but, in all events, at least five business days prior to the date that an
      answer to such Claim is due to be filed). Such contest and defense shall
      be conducted by reputable attorneys employed by the Indemnifying Party.
      The Notifying Party shall be entitled at any time, at its own cost and
      expense (which expense shall not constitute a Loss unless the Notifying
      Party reasonably determines that the Indemnifying Party is not adequately
      representing or, because of a conflict of interest, may not adequately
      represent, any interests of the Indemnified Parties, and only to the
      extent that such expenses are reasonable), to participate in such contest
      and defense and to be represented by attorneys of its or their own
      choosing. If the Notifying Party elects to participate in such defense,
      the Notifying Party will cooperate with the Indemnifying Party in the
      conduct of such defense. Neither the Notifying Party nor the Indemnifying
      Party may concede, settle or compromise any Claim without the consent of
      the other party, which consents will not be unreasonably withheld.
      Notwithstanding the foregoing, (i) if a Claim seeks equitable relief or
      (ii) if the subject matter of a Claim relates to the ongoing business of
      any of the Indemnified Parties, which Claim, if decided against any of the
      Indemnified Parties, would materially adversely affect the ongoing
      business or reputation of any of the Indemnified Parties, then, in each
      such case, the Indemnified Parties alone shall be entitled to contest,
      defend


                                      -26-
<PAGE>

      and settle such Claim in the first instance and, if the Indemnified
      Parties do not contest, defend or settle such Claim, the Indemnifying
      Party shall then have the right to contest and defend (but not settle)
      such Claim.

            (b) In the event any Indemnified Party should have a claim against
      any Indemnifying Party that does not involve a Claim, the Notifying Party
      shall deliver a notice of such claim with reasonable promptness to the
      Indemnifying Party. If the Indemnifying Party notifies the Notifying Party
      that it does not dispute the claim described in such notice or fails to
      notify the Notifying Party within 30 days after delivery of such notice by
      the Notifying Party whether the Indemnifying Party disputes the claim
      described in such notice, the Loss in the amount specified in the
      Notifying Party's notice will be conclusively deemed a liability of the
      Indemnifying Party and the Indemnifying Party shall pay the amount of such
      Loss to the Indemnified Party on demand. If the Indemnifying Party has
      timely disputed its Liability with respect to such claim, the Chief
      Executive Officers of each of the Indemnifying Party and the Notifying
      Party will proceed in good faith to negotiate a resolution of such
      dispute, and if not resolved through the negotiations of such Chief
      Executive Officers within 60 days after the delivery of the Notifying
      Party's notice of such claim, such dispute shall be resolved fully and
      finally as provided in Section 15.7 of this Agreement.

            (c) After the Closing, the rights set forth in this Section 15 shall
      be each party's sole and exclusive remedies against the other party hereto
      for misrepresentations or breaches of covenants contained in this
      Agreement and the Related Documents. Notwithstanding the foregoing,
      nothing herein shall prevent any of the Indemnified Parties from bringing
      an action based upon allegations of fraud or other intentional breach of
      an obligation of or with respect to either party in connection with this
      Agreement and the Related Documents. In the event such action is brought,
      the prevailing party's attorneys' fees and costs shall be paid by the
      nonprevailing party.

            14.4 Adjustment. Any indemnification payable under this Section 14
shall be, to the extent permitted by law, an adjustment to the aggregate
purchase price paid for the Shares.

      15. Miscellaneous.

            15.1 Waivers, Amendments and Approvals. In each case in which
approval of the Investor is required by the terms of this Agreement, such
requirement shall be satisfied by a vote or the written action of Investor. With
the written consent of Investor, the obligations of the Company under this
Agreement may be waived (either generally or in a particular instance and either
retroactively or prospectively) and with the written approval of Investor, the
Company may enter into a supplementary agreement for the purpose of adding any
provisions to or changing in any manner or eliminating any of the provisions of
this Agreement or of any supplemental agreement or modifying in any manner the
rights and obligations of the holders of the shares of the Company; provided,
however, that no such waiver or supplemental agreement shall (a) amend the terms
of the Common Stock or any other classes of stock as set forth in the Company's
Certificate of Incorporation, (b) amend the provisions of this Agreement
granting


                                      -27-
<PAGE>

rights to the holders of the Shares (including, but not limited to, registration
rights under Section 8) without the written consent of the holders of a majority
of the Shares, or (c) reduce the aforesaid proportions of Shares the holders of
which are required to consent to any waiver or supplemental agreement, without
the consent of all of the record holders of Shares whose rights would be
affected by such reduction. Written notice of any such waiver, consent or
agreement of amendment, modification or supplement shall be given to the record
holders of the Shares who have not previously consented thereto in writing. In
all cases in which the consent or approval of, or actions by, the Investor or
the holders of the Shares is required by the terms of this Agreement, the number
of Shares owned by such holder or Investor shall be determined on an
as-if-converted basis, when applicable.

            15.2 Changes, Waivers, Etc. Neither this Agreement nor any provision
hereof may be changed, waived, discharged or terminated orally, but only by a
statement in writing signed by the party against which enforcement of the
change, waiver, discharge or termination is sought, except to the extent
provided in Section 15.1.

            15.3 Payment of Fees and Expenses of the Investors. The Company
agrees to reimburse the Investor for legal expenses incurred by the Investor to
its special legal counsel, Dorsey & Whitney LLP, in connection with the
transactions contemplated by this Agreement in an amount not to exceed $95,000.
The Company also agrees to reimburse the Investor for the reasonable legal
expenses incurred by the Investor in retaining special counsel in connection
with any future amendments or waivers under or with respect to this Agreement
and for any expenses incurred by the Investor in making public announcements of
the investment contemplated hereby.

            15.4 Notices. All notices, requests, consents and other
communications required or permitted hereunder shall be in writing and shall be
delivered, or mailed first-class postage prepaid, fedex, registered or certified
mail,

            (a) if to any holder of any Shares addressed to such holder at its
      address as shown on the books of the Company, or at such other address as
      such holder may specify by written notice to the Company, or

            (b) if to the Company at: 60 Montgomery Street, Bellville, NJ 07109.
      Attention: Frank Gibbard; or at such other address as the Company may
      specify by written notice to the Investor.

and such notices and other communications shall for all purposes of this
Agreement be treated as being effective or having been given if delivered
personally, sent by fax with confirmation sheet, or, if sent by mail, when
received.

            15.5 Parties in Interest. All the terms and provisions of this
Agreement shall be binding upon and inure to the benefit of and be enforceable
by the respective successors and assigns of the parties hereto, whether so
expressed or not, and, in particular, shall inure to the benefit of and be
enforceable by the holder or holders from time to time of any of the Shares;


                                      -28-
<PAGE>

provided, however, that a successor or assign of an Investor shall not be
regarded as an "Investor".

            15.6 Headings. The headings of the sections of this Agreement have
been inserted for convenience of reference only and do not constitute a part of
this Agreement.

            15.7 Choice of Law; Jurisdiction and Venue. The laws of the State of
Delaware shall govern the validity of this Agreement, the construction of its
terms and the interpretation of the rights and duties of the parties hereunder.
THIS AGREEMENT MAY BE ENFORCED IN ANY FEDERAL COURT OR STATE COURT SITTING IN
THE STATE OF VIRGINIA, AND EACH PARTY CONSENTS TO THE JURISDICTION AND VENUE OF
SUCH COURT AND WAIVES ANY ARGUMENT THAT VENUE IN SUCH FORUM IS NOT CONVENIENT.
IF ANY PARTY COMMENCES ANY ACTION UNDER ANY TORT OR CONTRACT THEORY ARISING
DIRECTLY OR INDIRECTLY FROM THE RELATIONSHIP CREATED BY THIS AGREEMENT IN
ANOTHER JURISDICTION OR VENUE, THE OTHER PARTY TO THIS AGREEMENT SHALL HAVE THE
OPTION OF TRANSFERRING THE CASE TO THE ABOVE-DESCRIBED JURISDICTION OR, IF SUCH
TRANSFER CANNOT BE ACCOMPLISHED OR THE PARTY DECLINES TO ELECT SUCH CHANGE OF
VENUE, TO HAVE THE CASE DISMISSED WITHOUT PREJUDICE.

            15.8 Counterparts. This Agreement may be executed concurrently in
two or more counterparts, each of which shall be deemed an original, but all of
which together shall constitute one and the same instrument.

            15.9 Survival of Representations and Warranties. The representations
and warranties contained in Sections 3 and 4 of this Agreement shall survive the
Initial Closing and be true in all material respects as of the Closing.


           [REMAINING PORTION OF THIS PAGE INTENTIONALLY LEFT BLANK]


                                      -29-
<PAGE>

      IN WITNESS WHEREOF, the Company and the Investor have each caused this
Agreement to be executed by their respective duly authorized representative.


                                           H POWER CORP.


                                           By: /s/ H. Frank Gibbard

                                           Its: CEO


                                           ECO FUEL CELLS, LLC


                                           By: /s/ John McSweeney

                                           Its: CEO and President


                                      -30-
<PAGE>

                                    EXHIBIT H

                         REGISTRATION RIGHTS PROVISIONS

Capitalized terms used herein have the meanings set forth in Section 8 hereof.

            1. Demand Registration.

            (a) At any time after the second anniversary of the Closing of the
Stock Purchase Agreement, a Majority-in-Interest of the Holders shall have the
right, by written notice (the "Demand Notice") given to the Company, to request
the Company to file with the SEC a Registration Statement with respect to all or
any portion of the Registrable Shares held by such Holders. Upon receipt of any
such Demand Notice, the Company shall promptly, but in no event more than five
days after receipt thereof, notify all other Holders of the receipt of such
Demand Notice and, subject to the limitations set forth below, shall include in
the proposed registration all Registrable Shares with respect to which the
Company has received written requests for inclusion therein within 20 days after
delivery of the Company's notice. In connection with any Demand Registration in
which more than one holder of securities participates, in the event that such
Demand Registration involves an underwritten offering and the managing
underwriter or underwriters participating in such offering advise in writing the
Holders of Registrable Shares and the holders of other securities to be included
in such offering that the total number of Registrable Shares and other
securities to be included in such offering exceeds the amount that can be sold
in (or during the time of) such offering without delaying or jeopardizing the
success of such offering (including the price per share of the Registrable
Shares and other securities to be sold), then the amount of Registrable Shares
and other securities to be offered for the account of such Holders shall be
reduced as follows: first, pro rata on the basis of the number of securities
other than Registrable Shares requested to be registered by the holders of such
securities; and second, pro rata on the basis of the number of Registrable
Shares requested to be registered by the holders of such securities. The Holders
as a group shall be entitled to two Demand Registrations pursuant to this
Section 1; provided, that any Demand Registration that does not become effective
or is not maintained for the time period required in accordance with Section
1(c) shall not count as one of such Demand Registrations, except as set forth in
Section 1(e); provided, further, that if the Demanding Holders have requested
inclusion in such Demand Registration and 75% or less of the securities so
requested to be included have been included, the Holders as a group shall be
entitled to an additional Demand Registration hereunder on the same terms and
conditions as would have applied to the Holders had such earlier Demand
Registration not been made. Anything herein to the contrary notwithstanding, the
Company shall not be required to effect a Demand Registration pursuant to this
Section 1 within a period of six (6) months after the effective date of any
other Demand Registration.

            (b) The Company, within 45 days of the date on which the Company
receives a Demand Notice given by Holders in accordance with Section 1(a)
hereof, shall file with the SEC, and the Company shall thereafter use its best
efforts to cause to be declared effective within 90 days following the date the
Company receives such Demand Notice, a Registration Statement


                                      H-1
<PAGE>

on the appropriate form for the registration and sale, in accordance with the
intended method or methods of distribution requested by the Holders, of the
total number of Registrable Shares specified by the Holders in such Demand
Notice (a "Demand Registration").

            (c) The Company shall use commercially reasonable efforts to keep
each Registration Statement filed pursuant to this Section 1 continuously
effective and usable for the resale of the Registrable Shares covered thereby
for a period of 270 days from the date on which the SEC declares such
Registration Statement effective, as such period may be extended pursuant to
this Section 1, or in the case of a Shelf Registration, for a period of two
years from the date that the SEC declares such "shelf" Registration Statement
effective, or if shorter, until all the Registrable Shares covered by such
Registration Statement have been sold pursuant to such Registration Statement.

            (d) The Company shall be entitled to postpone the filing of any
Registration Statement otherwise required to be prepared and filed by the
Company pursuant to this Section 1, or suspend the use of any effective
Registration Statement under this Section 1, for a reasonable period of time
which shall be as short as practicable, but in any event not in excess of 60
days (a "Delay Period"), if the Company determines in good faith that the
registration and distribution of the Registrable Shares covered or to be covered
by such Registration Statement would materially interfere with any pending
material financing, acquisition or corporate reorganization or other material
corporate development involving the Company or any of its Subsidiaries or would
require premature disclosure thereof and promptly gives the Holders written
notice of such determination, containing a statement of the reasons for such
postponement and an approximation of the period of the anticipated delay;
provided, however, that (i) the aggregate number of days included in all Delay
Periods during any consecutive 12 months shall not exceed the aggregate of (x)
180 days minus (y) the number of days occurring during all Interruption Periods
during such consecutive 12 months and (ii) a period of at least 60 days shall
elapse between the termination of any Delay Period or Interruption Period and
the commencement of the immediately succeeding Delay Period. If the Company
shall so postpone the filing of a Registration Statement, the Holders of
Registrable Shares to be registered shall have the right to withdraw the request
for registration by giving written notice to the Company from the Holders of a
majority of the Registrable Shares that were to be registered within 45 days
after receipt of the notice of postponement or, if earlier, the termination of
such Delay Period. The time period for which the Company is required to maintain
the effectiveness of any Registration Statement shall be extended by the
aggregate number of days of all Delay Periods and all Interruption Periods
occurring during such Registration and any extension thereof is hereinafter
referred to as the "Effectiveness Period". The Company shall not be entitled to
initiate a Delay Period unless it shall (A) to the extent permitted by
agreements with other security holders of the Company, concurrently prohibit
sales by such other security holders under registration statements covering
securities held by such other security holders and (B) in accordance with the
Company's policies from time to time in effect, forbid purchases and sales in
the open market by senior executives of the Company.

            (e) The Demanding Holders may, at any time prior to the effective
date of the Registration Statement relating to a Demand Registration, revoke
such request by providing a written notice to the Company revoking such request.
In the event of such revocation, the


                                      H-2
<PAGE>

Demanding Holders shall reimburse the Company for all of its out-of-pocket
expenses incurred in connection with the preparation, filing and processing of
the Registration Statement, unless (i) there has been a material adverse change
in the business, assets, properties, condition (financial or other), results of
operations or prospects of the Company and its Subsidiaries, since the time of
the Demand Notice, (ii) such revocation was based on the Company's failure to
comply in any material respect with its obligations hereunder or (iii) the
Demanding Holders choose to count the Demand Registration as one of the Demand
Registrations to which the Demanding Holders are entitled pursuant to the
penultimate sentence of Section 1(a).

            2. Piggyback Registration.

            (a) Right to Piggyback. If at any time the Company proposes to file
a registration statement under the Securities Act with respect to a public
offering of securities of the same type as the Registrable Shares for its own
account (other than a registration statement (i) on Form S-8 or any successor
form thereto, (ii) filed solely in connection with a dividend reinvestment plan
or employee benefit plan covering officers or directors of the Company or its
Affiliates or (iii) on Form S-4 or any successor form thereto, in connection
with a merger, acquisition or similar corporate transaction) or for the account
of any holder of securities of the same type as the Registrable Shares, then the
Company shall give written notice of such proposed filing to the Holders at
least 30 days before the anticipated filing date. Such notice shall offer the
Holders the opportunity to register such number of Registrable Shares as they
may request (a "Piggyback Registration"). Subject to Section 2(b) hereof, the
Company shall include in each such Piggyback Registration all Registrable Shares
with respect to which the Company has received written requests for inclusion
therein within 20 days after notice has been given to the Holders. Each Holder
shall be permitted to withdraw all or any portion of the Registrable Shares of
such Holder from a Piggyback Registration at any time prior to the effective
date of such Piggyback Registration.

            (b) Priority on Piggyback Registrations. The Company shall permit
the Holders to include all such Registrable Shares on the same terms and
conditions as any similar securities, if any, of the Company included therein.
Notwithstanding the foregoing, if the Company or the managing underwriter or
underwriters participating in such offering advise the Holders in writing that
the total number of securities requested to be included in such Piggyback
Registration exceeds the number which can be sold in (or during the time of)
such offering without delaying or jeopardizing the success of the offering
(including the price per share of the securities to be sold), then the number of
securities to be offered for the account of the Holders and other holders of
securities who requested to have securities included in such Piggyback
Registration shall be reduced (to zero if necessary) pro rata on the basis of
the number or amount of Common Stock (or the equivalent) requested to be
registered by each such Holder or holder participating in such offering.

            (c) Right To Abandon. Nothing in this Section 2 shall create any
liability on the part of the Company to the Holders if the Company in its sole
discretion should decide not to file a registration statement proposed to be
filed pursuant to Section 2(a) hereof or to withdraw such registration statement
subsequent to its filing, regardless of any action whatsoever that a


                                      H-3
<PAGE>

Holder may have taken, whether as a result of the issuance by the Company of any
notice hereunder or otherwise.

            3. Registration Procedures. In connection with the registration
obligations of the Company pursuant to and in accordance with Sections 1 and 2
hereof (and subject to Sections 1 and 2 hereof), the Company shall use
commercially reasonable efforts to effect such registration to permit the sale
of such Registrable Shares in accordance with the intended method or methods of
disposition thereof, and pursuant thereto the Company shall as expeditiously as
possible (but subject to Sections 1 and 2 hereof):

            (a) prepare and file with the SEC a Registration Statement for the
sale of the Registrable Shares on any form for which the Company then qualifies
or which counsel for the Company shall deem appropriate in accordance with such
Holders' intended method or methods of distribution thereof, subject to Section
1(b) hereof, and use commercially reasonable efforts to cause such Registration
Statement to become effective and remain effective as provided herein;

            (b) prepare and file with the SEC such amendments (including
post-effective amendments) to such Registration Statement, and such supplements
to the related Prospectus, as may be required by the applicable rules,
regulations or instructions under the Securities Act during the applicable
period in accordance with the intended methods of disposition specified by the
Holders of the Registrable Shares covered by such Registration Statement, make
generally available earnings statements satisfying the provisions of Section
11(a) of the Securities Act (provided that the Company shall be deemed to have
complied with this clause if it has complied with Rule 158 under the Securities
Act), and cause the related Prospectus as so supplemented to be filed pursuant
to Rule 424 under the Securities Act; provided, however, that before filing a
Registration Statement or Prospectus, or any amendments or supplements thereto
(other than reports required to be filed by it under the Exchange Act), the
Company shall furnish to the Holders of Registrable Shares covered by such
Registration Statement and their counsel for review and comment, copies of all
documents proposed to be filed;

            (c) notify the Holders of any Registrable Shares covered by such
Registration Statement promptly and (if requested) confirm such notice in
writing, (i) when a Prospectus or any Prospectus supplement or post-effective
amendment has been filed, and, with respect to such Registration Statement or
any post-effective amendment, when the same has become effective, (ii) of any
request by the SEC for amendments or supplements to such Registration Statement
or the related Prospectus or for additional information regarding such Holders,
(iii) of the issuance by the SEC of any stop order suspending the effectiveness
of such Registration Statement or the initiation of any proceedings for that
purpose, (iv) of the receipt by the Company of any notification with respect to
the suspension of the qualification or exemption from qualification of any of
the Registrable Shares for sale in any jurisdiction or the initiation or
threatening of any proceeding for such purpose, and (v) of the happening of any
event that requires the making of any changes in such Registration Statement,
Prospectus or documents incorporated or deemed to be incorporated therein by
reference so that they will not contain any untrue statement of a material fact
or omit to state any material fact required to be stated therein or necessary to
make the statements therein not misleading;


                                      H-4
<PAGE>

            (d) use commercially reasonable efforts to obtain the withdrawal of
any order suspending the effectiveness of such Registration Statement, or the
lifting of any suspension of the qualification or exemption from qualification
of any Registrable Shares for sale in any jurisdiction in the United States;

            (e) furnish to the Holder of any Registrable Shares covered by such
Registration Statement, each counsel for such Holders and each managing
underwriter, if any, without charge, one conformed copy of such Registration
Statement, as declared effective by the SEC, and of each post-effective
amendment thereto, in each case including financial statements and schedules and
all reports incorporated or deemed to be incorporated therein by reference; and
deliver, without charge, such number of copies of the preliminary prospectus,
any amended preliminary prospectus, each final Prospectus and any post-effective
amendment or supplement thereto, as such Holder may reasonably request in order
to facilitate the disposition of the Registrable Shares of such Holder covered
by such Registration Statement in conformity with the requirements of the
Securities Act;

            (f) prior to any public offering of Registrable Shares covered by
such Registration Statement, use commercially reasonable efforts to register or
qualify such Registrable Shares for offer and sale under the securities or Blue
Sky laws of such jurisdictions as the Holders of such Registrable Shares shall
reasonably request in writing; provided, however, that the Company shall in no
event be required to qualify generally to do business as a foreign corporation
or as a dealer in any jurisdiction where it is not at the time so qualified or
to execute or file a general consent to service of process in any such
jurisdiction where it has not theretofore done so or to take any action that
would subject it to general service of process or taxation in any such
jurisdiction where it is not then subject;

            (g) upon the occurrence of any event contemplated by paragraph
3(c)(v) above, prepare a supplement or post-effective amendment to such
Registration Statement or the related Prospectus or any document incorporated or
deemed to be incorporated therein by reference and file any other required
document so that, as thereafter delivered to the purchaser of the Registrable
Shares being sold thereunder (including upon the termination of any Delay
Period), such Prospectus will not contain an untrue statement of a material fact
or omit to state any material fact required to be stated therein or necessary to
make the statements therein, in light of the circumstances under which they were
made, not misleading;

            (h) use its best efforts to cause all Registrable Shares covered by
such Registration Statement to be listed on each securities exchange, if any, on
which similar securities issued by the Company are then listed or quoted and, if
no such securities are so listed, to be listed on the Nasdaq Stock Market and,
if listed on the Nasdaq Stock Market, use its best efforts to secure designation
of all such Registrable Shares covered by such registration statement as "NASDAQ
Securities" within the meaning of Rule 11Aa2-1 promulgated under the Exchange
Act or, failing that, to secure Nasdaq Stock Market authorization for such
Registrable Shares;


                                      H-5
<PAGE>

            (i) on or before the effective date of such Registration Statement,
provide the transfer agent of the Company for the Registrable Shares with
printed certificates for the Registrable Shares covered by such Registration
Statement, which are in a form eligible for deposit with The Depository Trust
Company;

            (j) make available for inspection by any Holder of Registrable
Shares included in such Registration Statement, any underwriter participating in
any offering pursuant to such Registration Statement, and any attorney,
accountant or other agent retained by any such Holder or underwriter
(collectively, the "Inspectors"), all financial and other records and other
information, pertinent corporate documents and properties of any of the Company
and its Subsidiaries and affiliates (collectively, the "Records"), as shall be
reasonably necessary to enable them to exercise their due diligence
responsibilities; provided, however, that the Records that the Company
determines, in good faith, to be confidential and which it notifies the
Inspectors in writing are confidential shall not be disclosed to any Inspector
unless such Inspector signs a confidentiality agreement reasonably satisfactory
to the Company (which shall permit the disclosure of such Records in such
Registration Statement or the related Prospectus if necessary to avoid or
correct a material misstatement in or material omission from such Registration
Statement or Prospectus) or either (i) the disclosure of such Records is
necessary to avoid or correct a misstatement or omission in such Registration
Statement or (ii) the release of such Records is ordered pursuant to a subpoena
or other order from a court of competent jurisdiction; provided, further, that
(A) any decision regarding the disclosure of information pursuant to subclause
(i) shall be made only after consultation with counsel for the applicable
Inspectors and the Company and (B) with respect to any release of Records
pursuant to subclause (ii), each Holder of Registrable Shares agrees that it
shall, promptly after learning that disclosure of such Records is sought in a
court having jurisdiction, give notice to the Company so that the Company, at
the Company's expense, may undertake appropriate action to prevent disclosure of
such Records; and

            (k) if such offering is an underwritten offering, enter into such
agreements (including an underwriting agreement in form, scope and substance as
is customary in underwritten offerings) and take all such other appropriate and
reasonable actions requested by the Holders of a majority of the Registrable
Shares being sold in connection therewith (including those reasonably requested
by the managing underwriters) in order to expedite or facilitate the disposition
of such Registrable Shares, and in such connection, (i) use commercially
reasonable efforts to obtain opinions of counsel to the Company and updates
thereof (which counsel and opinions (in form, scope and substance) shall be
reasonably satisfactory to the managing underwriters and counsel to the Holders
of the Registrable Shares being sold), addressed to each selling Holder of
Registrable Shares covered by such Registration Statement and each of the
underwriters as to the matters customarily covered in opinions requested in
underwritten offerings and such other matters as may be reasonably requested by
such counsel and underwriters, (ii) use commercially reasonable efforts to
obtain "cold comfort" letters and updates thereof from the independent certified
public accountants of the Company (and, if necessary, any other independent
certified public accountants of any subsidiary of the Company or of any business
acquired by the Company for which financial statements and financial data are,
or are required to be, included in the Registration Statement), addressed to
each selling holder of Registrable Shares covered by the Registration Statement
(unless such accountants shall be prohibited from so


                                      H-6
<PAGE>

addressing such letters by applicable standards of the accounting profession)
and each of the underwriters, such letters to be in customary form and covering
matters of the type customarily covered in "cold comfort" letters in connection
with underwritten offerings, (iii) if requested and if an underwriting agreement
is entered into, provide indemnification provisions and procedures reasonably
requested by such underwriters. The above shall be done at each closing under
such underwriting or similar agreement, or as and to the extent required
thereunder. The Company may require each Holder of Registrable Shares covered by
a Registration Statement to furnish, within a period not less than 20 days from
the date of receipt of such request, such information regarding such Holder and
such Holder's intended method of disposition of such Registrable Shares as it
may from time to time reasonably request in writing. If any such information is
not furnished within such period, the Company may exclude such Holder's
Registrable Shares from such Registration Statement. Each Holder of Registrable
Shares covered by a Registration Statement agrees that, upon receipt of any
notice from the Company of the happening of any event of the kind described in
Section 3(c)(ii), 3(c)(iii), 3(c)(iv) or 3(c)(v) hereof, that such Holder shall
forthwith discontinue disposition of any Registrable Shares covered by such
Registration Statement or the related Prospectus until receipt of the copies of
the supplemented or amended Prospectus contemplated by Section 3(g) hereof, or
until such Holder is advised in writing by the Company that the use of the
applicable Prospectus may be resumed, and has received copies of any amended or
supplemented Prospectus or any additional or supplemental filings which are
incorporated, or deemed to be incorporated, by reference in such Prospectus
(such period during which disposition is discontinued being an "Interruption
Period") and, if requested by the Company, the Holder shall deliver to the
Company (at the expense of the Company) all copies then in its possession, other
than permanent file copies then in such holder's possession, of the Prospectus
covering such Registrable Shares at the time of receipt of such request. Each
Holder of Registrable Shares covered by a Registration Statement further agrees
not to utilize any material other than the applicable current preliminary
prospectus or Prospectus in connection with the offering of such Registrable
Shares.

            4. Registration Expenses. Whether or not any Registration Statement
is filed or becomes effective but subject to Section 1(e), the Company shall pay
all costs, fees and expenses incident to the Company's performance of or
compliance with this Agreement, including (i) all registration and filing fees,
including National Association of Securities Dealers filing fees, (ii) all fees
and expenses of compliance with securities or Blue Sky laws, including
reasonable fees and disbursements of counsel in connection therewith, (iii)
printing expenses (including expenses of printing certificates for Registrable
Shares and of printing prospectuses if the printing of prospectuses is requested
by the Holders or the managing underwriter, if any), (iv) messenger, telephone
and delivery expenses, (v) fees and disbursements of counsel for the Company,
(vi) fees and disbursements of all independent certified public accountants of
the Company (including expenses of any "cold comfort" letters required in
connection with this Agreement) and all other persons retained by the Company in
connection with such Registration Statement, (vii) fees and disbursements of one
counsel, other than the Company's counsel, representing all of the Holders of
Registrable Shares being registered, selected by a Majority-in-Interest of
Holders of the Registrable Shares being registered, or in the event of a Demand
Registration, selected by the Demanding Holders and reasonably satisfactory to a
Majority-in-Interest of Holders of the Registrable Shares being registered other
than the Demanding Holders, (viii) fees and


                                      H-7
<PAGE>

disbursements of underwriters customarily paid by the issuers or sellers of
securities and (ix) all other costs, fees and expenses incident to the Company's
performance or compliance with this Agreement. Notwithstanding the foregoing,
any discounts, commissions or brokers' fees or fees of similar securities
industry professionals and any transfer taxes relating to the disposition of the
Registrable Shares by a Holder, will be payable by such Holder and the Company
will have no obligation to pay any such amounts.

            5. Underwriting Requirements.

            (a) Subject to Section 5(b) hereof, the Demanding Holders shall have
the right, by written notice, to require that any Demand Registration provide
for an underwritten offering.

            (b) In the case of any underwritten offering pursuant to a Demand
Registration, the Demanding Holders shall select the institution or institutions
that shall manage or lead such offering, which institution or institutions shall
be reasonably satisfactory to the Company. In the case of any underwritten
offering pursuant to a Piggyback Registration, the Company shall select the
institution or institutions that shall manage or lead such offering. No Holder
shall be entitled to participate in an underwritten offering unless and until
such Holder has entered into an underwriting or other agreement with such
institution or institutions for such offering in such form as the Company and
such institution or institutions shall determine and such form is on terms
customary for such an offering.

            (c) Each Holder participating in a Registration shall promptly
supply in writing such information as the Demanding Holders, the Company or the
underwriters reasonably request.

            6. Indemnification.

            (a) Indemnification by the Company. The Company shall indemnify and
hold harmless, to the full extent permitted by law, each Holder of Registrable
Shares whose Registrable Shares are covered by a Registration Statement or
Prospectus, the officers, directors and agents and employees of each of them,
each Person who controls each such Holder (within the meaning of Section 15 of
the Securities Act or Section 20 of the Exchange Act) and the officers,
directors, agents and employees of each such controlling Person, to the fullest
extent lawful, from and against any and all losses, claims, damages,
liabilities, judgment, costs (including, without limitation, costs of
investigation, preparation and reasonable attorneys' fees) and expenses
(collectively, "Losses"), as incurred, arising out of or based upon any untrue
or alleged untrue statement of a material fact contained in such Registration
Statement or Prospectus or in any amendment or supplement thereto or in any
preliminary prospectus, or arising out of or based upon any omission or alleged
omission of a material fact required to be stated therein or necessary to make
the statements therein not misleading, except insofar as the same are based upon
information furnished in writing to the Company by or on behalf of such Holder
expressly for use therein.


                                      H-8
<PAGE>

            (b) Indemnification by Holder of Registrable Shares. In connection
with any Registration Statement in which a Holder is participating, such Holder
shall indemnify and hold harmless, to the full extent permitted by law, the
Company, its directors, officers, agents or employees, each Person who controls
the Company (within the meaning of Section 15 of the Securities Act and Section
20 of the Exchange Act) and the directors, officers, agents or employees of such
controlling Persons, from and against all Losses arising out of or based upon
any untrue or alleged untrue statement of a material fact contained in such
Registration Statement or the related Prospectus or any amendment or supplement
thereto, or any preliminary prospectus, or arising out of or based upon any
omission or alleged omission of a material fact required to be stated therein or
necessary to make the statements therein not misleading, to the extent, but only
to the extent, that such untrue or alleged untrue statement or omission or
alleged omission is based upon any information furnished in writing by or on
behalf of such Holder to the Company expressly for use in such Registration
Statement or Prospectus. Each Holder's indemnity obligations under this Section
6 shall be limited to the total sales proceeds (net of all underwriting
discounts and commissions) actually received by such Holder in connection with
the applicable offering.

            (c) Conduct of Indemnification Proceedings. If any Person shall be
entitled to indemnity hereunder (an "indemnified party"), such indemnified party
shall give prompt notice to the party from which such indemnity is sought (the
"indemnifying party") of any claim or of the commencement of any proceeding with
respect to which such indemnified party seeks indemnification or contribution
pursuant hereto; provided, however, that the delay or failure to so notify the
indemnifying party shall not relieve the indemnifying party from any obligation
or liability except to the extent that the indemnifying party has been
prejudiced by such delay or failure. The indemnifying party shall have the
right, exercisable by giving written notice to an indemnified party promptly
after the receipt of written notice from such indemnified party of such claim or
proceeding, to assume, at the indemnifying party's expense, the defense of any
such claim or proceeding, with counsel reasonably satisfactory to such
indemnified party; provided, however, that (i) an indemnified party shall have
the right to employ separate counsel in any such claim or proceeding and to
participate in the defense thereof, but the fees and expenses of such counsel
shall be at the expense of such indemnified party unless: (1) the indemnifying
party agrees to pay such fees and expenses; (2) the indemnifying party fails
promptly to assume the defense of such claim or proceeding or fails to employ
counsel reasonably satisfactory to such indemnified party; or (3) the named
parties to any proceeding (including impleaded parties) include both such
indemnified party and the indemnifying party, and such indemnified party shall
have been advised by counsel that there may be one or more legal defenses
available to it that are inconsistent with those available to the indemnifying
party or that a conflict of interest is likely to exist among such indemnified
party and any other indemnified parties (in which case the indemnifying party
shall not have the right to assume the defense of such action on behalf of such
indemnified party); and (ii) subject to clause (3) above, the indemnifying party
shall not, in connection with any one such claim or proceeding or separate but
substantially similar or related claims or proceedings in the same jurisdiction,
arising out of the same general allegations or circumstances, be liable for the
fees and expenses of more than one firm of attorneys (together with appropriate
local counsel) at any time for all of the indemnified parties, or for fees and
expenses that are not reasonable. Whether or not such defense is assumed by the
indemnifying


                                      H-9
<PAGE>

party, such indemnified party shall not be subject to any liability for any
settlement made without its consent. The indemnifying party shall not consent to
entry of any judgment or enter into any settlement unless (i) there is no
finding or admission of any violation of any rights of any person and no effect
on any other claims that may be made against the indemnified party, (ii) the
sole relief provided is monetary damages that are paid in full by the
indemnifying party and (iii) such judgment or settlement includes as an
unconditional term thereof the giving by the claimant or plaintiff to such
indemnified party of a release, in form and substance reasonably satisfactory to
the indemnified party, from all liability in respect of such claim or litigation
for which such indemnified party would be entitled to indemnification hereunder.

            (d) Contribution. If the indemnification provided for in this
Section 6 is unavailable to an indemnified party in respect of any Losses (other
than in accordance with its terms), then each applicable indemnifying party, in
lieu of indemnifying such indemnified party, shall contribute to the amount paid
or payable by such indemnified party as a result of such Losses, in such
proportion as is appropriate to reflect the relative fault of the indemnifying
party, on the one hand, and such indemnified party, on the other hand, in
connection with the actions, statements or omissions that resulted in such
Losses as well as any other relevant equitable considerations. The relative
fault of such indemnifying party, on the one hand, and indemnified party, on the
other hand, shall be determined by reference to, among other things, whether any
action in question, including any untrue statement of a material fact or
omission or alleged omission to state a material fact, has been taken by, or
relates to information supplied by, such indemnifying party or indemnified
party, and the parties' relative intent, knowledge, access to information and
opportunity to correct or prevent any such action, statement or omission. The
amount paid or payable by a party as a result of any Losses shall be deemed to
include any legal or other fees or expenses incurred by such party in connection
with any investigation or proceeding. The parties hereto agree that it would not
be just and equitable if contribution pursuant to this Section 6(d) were
determined by pro rata allocation or by any other method of allocation that does
not take account of the equitable considerations referred to in the two
immediately preceding sentences. Notwithstanding the provisions of this Section
6(d), an indemnifying party that is a Holder shall not be required to contribute
any amount which is in excess of the amount by which the total proceeds (net of
all underwriting discounts and commissions) received by such Holder from the
sale of the Registrable Shares sold by such Holder in the applicable offering
exceed the amount of any damages that such indemnifying party has otherwise been
required to pay by reason of such untrue or alleged untrue statement or omission
or alleged omission. No person guilty of fraudulent misrepresentation (within
the meaning of Section 11(f) of the Securities Act) shall be entitled to
contribution from any Person who was not guilty of such fraudulent
misrepresentation.

            7. Granting of Registration Rights. The Company shall not grant any
registration rights inconsistent with those granted hereunder or that give any
security holder a position with respect to cut-backs that are superior to the
Holders' position as granted herein, without the consent of a
Majority-in-Interest of the Holders of the Registrable Shares (voting together
as a single class).

            8. Definitions. As used in this Exhibit E, the following terms shall
have the following meanings:


                                      H-10
<PAGE>

            "Business Day" means any day that is not a Saturday, a Sunday or a
legal holiday on which banking institutions in the State of New York are not
required to be open.

            "Common Stock" means the Company's Common Stock, $.001 par value and
any other securities into which such Common Stock may hereafter be changed.

            "Delay Period" shall have the meaning set forth in Section 1(d)
hereof.

            "Demand Notice" shall have the meaning set forth in Section 1(a)
hereof.

            "Demand Registration" shall have the meaning set forth in Section
1(b) hereof.

            "Demanding Holders" means the Holders delivering the Demand Notice
pursuant to Section 1(a) hereof.

            "Effectiveness Period" shall have the meaning set forth in Section
1(d) hereof.

            "Exchange Act" means the Securities Exchange Act of 1934, as
amended, and the rules and regulations of the SEC promulgated thereunder.

            "Holders" means ECO Fuel Cells, LLC, a Delaware limited liability
company and any other holder of Registrable Shares or securities exercisable for
Registrable Shares.

            "Interruption Period" shall have the meaning set forth in Section
3(k) hereof.

            "Majority-in-Interest" of any group of Holders means holders of more
than 50% of the Registrable Shares held by such Holders.

            "person" means any individual, corporation, partnership, limited
liability company, joint venture, association, joint-stock company, trust,
unincorporated organization or government or any agency or political subdivision
thereof.

            "Piggyback Registration" shall have the meaning set forth in Section
2 hereof.

            "Prospectus" means the prospectus included in any Registration
Statement (including a prospectus that discloses information previously omitted
from a prospectus filed as part of an effective registration statement in
reliance upon Rule 430A), as amended or supplemented by any prospectus
supplement, with respect to the terms of the offering of any portion of the
Registrable Shares covered by such Registration Statement and all other
amendments and supplements to such prospectus, including post-effective
amendments, and all material incorporated by reference or deemed to be
incorporated by reference in such prospectus.

            "Registrable Shares" means (i) shares of Common Stock issued or
issuable to Holders; and (ii) any shares of Common Stock issued or issuable with
respect to the shares of


                                      H-11
<PAGE>

Common Stock referred to in clause (i) above upon any stock split,
recapitalization or similar event; provided, however, that shares of Common
Stock shall only be registrable pursuant to this Agreement if and so long as
they have not been (i) sold to or through a broker or dealer or underwriter in a
public distribution or a public securities transaction, or (ii) sold in a
transaction exempt from the registration and prospectus delivery requirements of
the Securities Act under Section 4(1) thereof so that all transfer restrictions
and restrictive legends with respect to such shares of Common Stock are removed
upon the consummation of such sale and the Company and the seller and purchaser
of such shares of Common Stock shall have received an opinion of counsel for the
seller, which shall be in form and content reasonably satisfactory to the
Company and the seller and purchaser and their respective counsel, to the effect
that such shares of Common Stock in the hands of the purchaser are freely
transferable without restriction or registration under the Securities Act in any
public or private transaction.

            "Registration" means registration under the Securities Act of an
offering of Registrable Shares pursuant to a Demand Registration or a Piggyback
Registration.

            "Registration Statement" means any registration statement under the
Securities Act of the Company that covers any of the Registrable Shares pursuant
to the provisions of this Agreement, including the related Prospectus, all
amendments and supplements to such registration statement, including pre- and
post-effective amendments, all exhibits thereto and all material incorporated by
reference or deemed to be incorporated by reference in such registration
statement.

            "SEC" means the Securities and Exchange Commission.

            "Securities Act" means the Securities Act of 1933, as amended, and
the rules and regulations of the SEC promulgated thereunder.

            "Shelf Registration" means an offering on a delayed or continuous
basis pursuant to Rule 415 (or any similar rule that may be adopted by the SEC)
promulgated under the Securities Act.

            "Stock Purchase Agreement" means the Stock Purchase Agreement, dated
as of August 25, 1999, between the Company and the Investor.

            "underwritten registration or underwritten offering" means a
registration under the Securities Act in which securities of the Company are
sold to an underwriter for reoffering to the public.

            Unless otherwise stated other capitalized terms contained herein
have the meanings set forth in the Stock Purchase Agreement.

            9. Miscellaneous.


                                      H-12
<PAGE>

            (a) Rules 144 and 144A. The Company covenants that it will file any
reports required to be filed by it under the Securities Act and the Exchange Act
so as to enable Holders holding Registrable Shares to sell such Registrable
Shares without registration under the Securities Act within the limitation of
the exemptions provided by (a) Rules 144 and 144A under the Securities Act, as
each such Rule may be amended from time to time, or (b) any similar rule or
rules hereafter adopted by the SEC. Upon the request of any such Holder, the
Company will forthwith deliver to such Holder a written statement as to whether
it has complied with such requirements.

            (b) Termination. This Agreement and the obligations of the Company
and the Holders hereunder (other than Section 6 hereof) shall terminate on the
first date on which no Registrable Shares remain outstanding.

            (c) Notices. All notices, demands, requests, or other communications
which may be or are required to be given, served, or sent by any party to any
other party pursuant to the Registration Rights set forth in this Exhibit E
shall be given in accordance with Section 14.4 of the Stock Purchase Agreement.

            (d) Stock Purchase Agreement. This Exhibit H is deemed a part of the
Stock Purchase Agreement.


                                      H-13