PLUG POWER INC
S-8, 1999-11-04
ELECTRICAL INDUSTRIAL APPARATUS
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<PAGE>

   As filed with the Securities and Exchange Commission on November 3, 1999

                                   Registration Statement No. 333-______________
================================================================================

                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

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

                                   FORM S-8
                            REGISTRATION STATEMENT
                                     UNDER
                          THE SECURITIES ACT OF 1933

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

                                PLUG POWER INC.
            (Exact name of Registrant as Specified in Its Charter)

          Delaware                                     22-3672377
  (State of Incorporation)                (I.R.S. Employer Identification No.)

                            968 Albany-Shaker Road
                               Latham, NY 12110
                                (518) 782-7700
  (Address, including zip code, and telephone number, including area code, of
                   Registrant's principal executive offices)

                  Plug Power Inc. 1997 Membership Option Plan
             Plug Power Inc. 1999 Stock Option and Incentive Plan
                           (Full Title of the Plan)
                           ------------------------

                                Gary Mittleman
                     President and Chief Executive Officer
                                Plug Power Inc.
                            968 Albany-Shaker Road
                               Latham, NY 12110
                                (518) 782-7700

(Name, address, including zip code, and telephone number, including area code,
                             of agent for service)

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

                                With a copy to:

                          Robert P. Whalen, Jr., P.C.
                         Goodwin, Procter & Hoar LLP
                                Exchange Place
                       Boston, Massachusetts 02109-2881
                                (617) 570-1000

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


<TABLE>
<CAPTION>
                                                  CALCULATION OF REGISTRATION FEE
==================================================================================================================================
Title of Securities Being Registered    Amounts to be         Proposed Maximum             Proposed Maximum          Amount of
                                        Registered (1)  Offering Price Per Share (2)   Aggregate Offering Price   Registration Fee
- ----------------------------------------------------------------------------------------------------------------------------------
<S>                                     <C>             <C>                            <C>                        <C>
Common Stock, par value $.01 per           1,434,350             $ 1.00 (2)                   $ 1,434,350               $   399
           share                             579,189             $ 5.00 (2)                   $ 2,895,945               $   805
                                             587,700             $ 6.67 (2)                   $ 3,919,959               $ 1,090
                                             726,900             $11.00 (2)                   $ 7,995,900               $ 2,223
                                           2,343,052             $15.88 (3)                   $37,207,666               $10,344
                                        ------------                                                                    -------

                                           5,671,191 (total)                                                            $14,861
==================================================================================================================================
</TABLE>

(1)  This Registration Statement also relates to such indeterminate number of
     additional shares of Plug Power Inc. Common Stock as may be required
     pursuant to the 1997 Membership Option Plan and the 1999 Stock Option and
     Incentive Plan in the event of a stock dividend, reverse stock split,
     split-up, recapitalization, forfeiture of stock under the plan or other
     similar event.

(2)  Determined pursuant to Rule 457(h) under the  under the Securities Act of
     1933, as amended (the "Securities Act").

(3)  This estimate is made pursuant to Rule 457(c) and (h) of the Securities Act
     solely for the purposes of determining the amount of the registration fee.
     The registration fee is based upon the average of the high and low prices
     for the Registrant's Common Stock, par value $0.01 per share, as reported
     on The Nasdaq National Market on November 1, 1999.

================================================================================
<PAGE>

                                    PART I

             INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS


Item 1.   Plan Information.*
          ----------------


Item 2.   Registrant Information and Employee Plan Annual Information.*
          -----------------------------------------------------------


     * Information required by Part I to be contained in the Section 10(a)
Prospectuses is omitted from this Registration Statement in accordance with Rule
428 under the Securities Act of 1933 (the "Securities Act") and the Introductory
Note to Part I of Form S-8.


                                    PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT


Item 3.   Incorporation of Certain Documents by Reference.
          -----------------------------------------------

     Plug Power Inc. (the "Registrant") hereby incorporates by reference:

     the description of the Registrant's Common Stock contained in the
     Registration Statement on Form 8-A (Registration Statement No. 333-86089),
     dated October 1, 1999, as filed with the Securities and Exchange Commission
     on October 1, 1999 pursuant to Section 12(g) of the Securities Exchange Act
     of 1934, as amended.

     In addition, all documents subsequently filed with the Securities and
Exchange Commission by the Registrant pursuant to Sections 13(a), 13(c), 14 and
15(d) of the Exchange Act, prior to the filing of a post-effective amendment
hereto that indicates that all securities offered hereunder have been sold or
which deregisters all securities then remaining unsold, shall be deemed to be
incorporated by reference in this Registration Statement and to be a part hereof
from the date of filing of such documents. Any statement contained in a document
incorporated by reference herein shall be deemed to be modified or superseded
for purposes hereof to the extent that a statement contained herein or in any
subsequently filed document which also is incorporated by reference herein
modifies or supersedes such statement. Any statement so modified or superseded
shall not be deemed, except as so modified or superseded, to constitute a part
of this Registration Statement.


Item 4.   Description of Securities.
          -------------------------

     Not Applicable.


Item 5.   Interests of Named Experts and Counsel.
          --------------------------------------

     Not Applicable.

                                       2
<PAGE>

Item 6.   Indemnification of Directors and Officers.
          -----------------------------------------

          In accordance with Section 145 of the General Corporation Law of the
State of Delaware ("DGCL"), Article VII of the Registrant's Amended and Restated
Certificate of Incorporation (the "Certificate") provides that no director of
the Registrant shall be personally liable to the Registrant or its stockholders
for monetary damages for breach of fiduciary duty as a director, except for
liability (i) for any breach of the director's duty of loyalty to the Registrant
or its stockholders, (ii) for acts or omissions not in good faith or which
involve intentional misconduct or a knowing violation of law, (iii) under
Section 174, or (iv) for any transaction from which the director derived an
improper personal benefit. In addition, the Certificate provides that if the
Delaware General Corporation Law is amended to authorize the further elimination
or limitation of the personal liability of directors, then the liability of a
director of the Registrant shall be eliminated or limited to the fullest extent
permitted by the Delaware General Corporation Law, as so amended. The
Certificate further provides that any repeal of Article VII by the stockholders
or an amendment to the DGCL shall not adversely effect any right or protection
with respect to acts or omissions occurring prior to such repeal.

          Article V of the Registrant's Amended and Restated By-laws (the "By-
laws") provides for indemnification by the Registrant of its directors, officers
and certain non-officer employees under certain circumstances against expenses
(including attorneys fees, courts costs, travel expenses and additional
expenses), judgments, penalties, fines and amounts paid in settlement reasonably
incurred in connection with the defense or settlement of any threatened, pending
or completed legal proceeding in which any such person is involved by reason of
the fact that such person is or was a director, an officer or an employee of the
Registrant, or is acting in any capacity with other entities at the request of
the Registrant, if such person acted in good faith and in a manner he or she
reasonably believed to be in, or not opposed to, the best interests of the
Registrant, and with respect to criminal actions or proceedings, that such
person had no reasonable cause to believe his or her conduct was unlawful.

          The Registrant has entered into indemnification agreements with each
of its directors reflecting the foregoing provisions of its By-laws and
requiring the advancement of expenses in proceedings, if such person had no
reasonable cause to believe his or her conduct was unlawful.

          The Company carries directors' and officers' liability insurance
covering its directors and officers.

Item 7.   Exemption from Registration Claimed.
          -----------------------------------

       Not Applicable.


Item 8.   Exhibits.
          --------

       The following is a complete list of exhibits filed as part of this
Registration Statement.

Exhibits
- --------

    *4.1    Plug Power Inc. Amended and Restated Certificate of Incorporation
    *4.2    Plug Power Inc. Amended and Restated By-laws
     4.3    Plug Power Inc. 1997 Membership Option Plan, as amended
    *4.4    Plug Power Inc. 1999 Stock Option and Incentive Plan
     5.1    Opinion of Goodwin, Procter & Hoar LLP as to the legality of the
            securities being registered
    23.1    Consent of Goodwin, Procter & Hoar LLP (included in Exhibit 5.1)
    23.2    Consent of PricewaterhouseCoopers LLP
    24.1    Powers of Attorney (included on signature pages to this Registration
            Statement)

*  Incorporated by reference to the relevant exhibit to the Plug Power Inc.
Registration Statement on Form S-1 (SEC File No. 333-86089), as amended, as
filed with the Securities and Exchange Commission.

Item 9.   Undertakings.
          ------------

                                       3
<PAGE>

(a)            The undersigned Registrant hereby undertakes:

       (1)     To file, during any period in which offers or sales are being
  made, a post-effective amendment to this Registration Statement:

               (i)  To include any prospectus required by Section 10(a)(3) of
       the Securities Act; and

               (ii) To reflect in the prospectus any acts or events arising
       after the effective date of the Registration Statement (or the most
       recent post-effective amendment thereof) which, individually or in the
       aggregate, represent a fundamental change in the information set forth in
       the Registration Statement;

  provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) herein do not
  apply if the information required to be included in a post-effective amendment
  by those paragraphs is contained in periodic reports filed by the undersigned
  Registrant pursuant to Section 13 or Section 15(d) of the Exchange Act that
  are incorporated by reference in the Registration Statement;

       (2)     To remove from registration by means of a post-effective
  amendment any of the securities being registered which remain unsold at the
  termination of the offering.

(b)            The undersigned Registrant hereby undertakes that, for purposes
        of determining any liability under the Securities Act, each filing of
        the registrant's annual report pursuant to Section 13(a) or 15(d) of the
        Exchange Act (and, where applicable, each filing of an employee benefit
        plan's annual report pursuant to Section 15(d) of the Exchange Act) that
        is incorporated by reference in the Registration Statement shall be
        deemed to be a new registration statement relating to the securities
        offered therein, and the offering of such securities at that time shall
        be deemed to be the initial bona fide offering thereof.

(c)            Insofar as indemnification for liabilities arising under the
        Securities Act may be permitted to directors, officers and controlling
        persons of the Registrant pursuant to the foregoing provisions, or
        otherwise, the Registrant has been advised that in the opinion of the
        Securities and Exchange Commission such indemnification is against
        public policy as expressed in the Securities Act, and is, therefore,
        unenforceable. In the event that a claim for indemnification against
        such liabilities (other than the payment by the Registrant of expenses
        incurred or paid by a director, officer or controlling person of the
        Registrant in the successful defense of any action, suit or proceeding)
        is asserted by such director, officer or controlling person in
        connection with the securities being registered, the Registrant will,
        unless in the opinion of its counsel the matter has been settled by
        controlling precedent, submit to a court of appropriate jurisdiction the
        question whether such indemnification by it is against public policy as
        expressed in the Securities Act and will be governed by the final
        adjudication of such issue.

                                       4
<PAGE>

                                  SIGNATURES

     Pursuant to the requirements of the Securities Act, Plug Power Inc.
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-8 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in Latham, New York on this 3rd day of November, 1999.

                              Plug Power Inc.


                              By: /s/ Gary Mittleman
                                  --------------------------------------
                                  Gary Mittleman
                                  President and Chief Executive Officer

                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS that each individual whose signature appears
below constitutes and appoints each of Gary Mittleman and Ana-Maria Galeano such
person's true and lawful attorney-in-fact and agent with full power of
substitution and resubstitution, for such person and in such person's name,
place and stead, in any and all capacities, to sign any and all amendments
(including post-effective amendments) to this Registration Statement, and to
file the same, with all exhibits thereto, and all documents in connection
therewith, with the Securities and Exchange Commission, granting unto each said
attorney-in-fact and agent full power and authority to do and perform each and
every act and thing requisite and necessary to be done in and about the
premises, as fully to all intents and purposes as such person might or could do
in person, hereby ratifying and confirming all that any said attorney-in-fact
and agent, or any substitute or substitutes of any of them, may lawfully do or
cause to be done by virtue hereof.

     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities and on the dates indicated.


<TABLE>
<CAPTION>
          Signature                         Title                                        Date
          ---------                         -----                                        ----
<S>                                <C>                                            <C>
/s/ Gary Mittleman                 President, Chief Executive                     November 3, 1999
- ---------------------------        Officer (Principal Executive Officer)
Gary Mittleman                     and Director


/s/ William H. Largent             Treasurer and Chief Financial Officer          November 3, 1999
- ---------------------------        (Principal Financial Officer and
William H. Largent                 Principal Accounting Officer)


/s/ Michael Cudahy                 Director                                       November 3, 1999
- ---------------------------
Michael Cudahy


/s/ Anthony F. Earley, Jr.         Director                                       November 3, 1999
- ---------------------------
Anthony F. Earley, Jr.


/s/ Larry G. Garberding            Director                                       November 3, 1999
- ---------------------------
Larry G. Garberding
</TABLE>

                                      S-1
<PAGE>

<TABLE>
<S>                                        <C>                                    <C>
/s/ George C. McNamee                      Chairman                               November 3, 1999
- ---------------------------------
George C. McNamee


/s/ Dr. Walter L. Robb                     Director                               November 3, 1999
- ----------------------------------
Dr. Walter L. Robb


/s/ Robert L. Nardelli                     Director                               November 3, 1999
- ----------------------------------
Robert L. Nardelli


/s/ General John M. Shalikashvili          Director                               November 3, 1999
- ---------------------------------
General John M. Shalikashvili
</TABLE>

                                      S-2
<PAGE>

                                 EXHIBIT INDEX

Exhibit No.    Description
- ----------     -----------

   *4.1        Amended and Restated Certificate of Incorporation

   *4.2        Amended and Restated By-Laws of the Registrant

    4.3        Plug Power Inc. 1997 Membership Option Plan, as amended

   *4.4        Plug Power Inc. 1999 Stock Option and Incentive Plan

    5.1        Opinion of Goodwin, Procter & Hoar LLP as to the legality of the
               securities being registered

   23.1        Consent of Goodwin, Procter & Hoar LLP (included in Exhibit 5.1)

   23.2        Consent of PricewaterhouseCoopers LLP

   24.1        Powers of Attorney (included on signature pages to this
               Registration Statement)


*  Incorporated by reference to the relevant exhibit to the Plug Power Inc.
   Registration Statement on Form S-1 (SEC File No. 333-86089), as amended, as
   filed with the Securities and Exchange Commission.

<PAGE>

                                                                     Exhibit 4.3

                              PLUG POWER, L.L.C.

                                    SECOND
                           AMENDMENT AND RESTATEMENT
                                    OF THE
                            MEMBERSHIP OPTION PLAN

                               February 15, 1999


     WHEREAS, Plug Power, L.L.C., a limited liability company organized under
the laws of the State of Delaware ("Company") entered into a Membership Option
Plan and Agreement, effective as of the 1st day of July, 1997 (the "Plan"); and

     WHEREAS, the Company desires to amend the Plan to provide consultants the
opportunity to acquire Class B membership interests in the Company and to share
in its success, with the added incentive to work effectively for and in the
Company's interest; and

     WHEREAS, at a special meeting of the Members of Company held on January 26,
1999, at which all of the Members were present, either by person or by
telephone, and acting with full authority, the Members unanimously agreed to
amend the limited liability company agreement to permit the company to provide
consultants the opportunity to acquire Class B membership interests in the
Company, subject to the specific prior approval by the board of managers for
each consulting contract that provides stock options as part of the contract;
and

     WHEREAS, the Company desires to also amend the Plan to include in the
definition of "Employees" eligible to participate in the Plan those employees of
the Company who become directly employed by GE Fuel Cell Systems, L.L.C.
("GEFCS"); and

     WHEREAS, such former employees shall be subject to the same terms and
conditions of the Plan; and

     NOW, THEREFORE, the text of the original Plan as amended is hereby amended
and restated in its entirety to read as follows:

     Agreement, made and effective as of the 15th day of February, by Plug
Power, L.L.C., a limited liability company organized under the laws of the State
of Delaware ("Company").

     WHEREAS, Company is a limited liability corporation with Class A membership
interests and Class B membership interests, and

     WHEREAS, Company has determined that its interests will be advanced and
best served by providing an incentive to its current employees, certain former
employees and certain consultants, to acquire Class B membership interests in
Company and to share in its success, with the added incentive to work
effectively for and in Company's interest,

<PAGE>

     NOW THEREFORE, Company hereby establishes the Plan as follows:

ESTABLISHMENT OF PLAN

     The Plan shall be known as the Plug Power Membership Option Plan ("Plan"),
and shall be effective on the date first above written.

ELIGIBILITY

     Employees. All employees of Company shall participate in the Plan on its
     ---------
effective date.  An Employee who is eligible to participate in the Plan, as set
forth on Exhibit "A" is hereinafter referred to as "Employee", or in the plural,
as "Employees." Members of the Board of Managers ("Managers") of the Company
and/or Corporations named in lieu of a Manager, as set forth on Exhibit "B",
shall also participate in the Plan on its effective date.  In addition,
employees of the Company who become directly employed GE Fuel Cell Systems,
L.L.C.  ("GEFCS Employees") shall also be eligible to participate in the Plan.
Hereafter, in this Plan, Managers and/or Corporations and/or GEFCS Employees
shall be referred to as "Employees", and shall be subject to the remaining
provisions of this Plan as though they were Employees, unless specifically
provided otherwise.

     Consultants.  The board of managers of the Company shall determine those
     -----------
consultants of Company, as set forth on Exhibit "C", eligible to participate in
the Plan on its effective date.  A Consultant who is eligible to participate in
the Plan and who is shown on the attached Exhibit "C" is hereinafter referred to
as "Consultants", or in the plural, as "Consultants."

GRANT OF OPTIONS

     Employees.  Company hereby grants to the Employees, as shown on Exhibit "A"
     ---------
(Employees) and Exhibit "B" (Managers), as a matter of separate agreement and
not in lieu of any other compensation to which such Employees may be otherwise
entitled, the right and option, hereinafter called "Option", or "Options", to
purchase the number shares of Class B membership interests of the Company, at
such times, and in such amounts, as the Company shall determine, on the terms
and conditions hereinafter set forth.

     Company may, from time to time, grant additional Options to Employees.

     Consultants.  Company hereby grants to the Consultants, as shown on Exhibit
     -----------
"C", as a matter of separate agreement, the right and option, hereinafter called
"Option" or "Options", to purchase the number shares of class B membership
interests of the Company, at such times, and in such amounts, on the terms and
conditions hereinafter set forth.

     Company may, from time to time, amend Exhibit "C", as may be required to
add new Consultants who become eligible for the Plan, or to grant additional
Options to Consultants, but not without the prior authorization of the board of
managers.

                                       2
<PAGE>

OPTION PRICE

     The option exercise price for shares of Class B membership interests shall
be set forth on Exhibit "A" for Employees, Exhibit "B" for Managers, and Exhibit
"C" for Consultants, and shall be determined by the Company's board of managers
and which price shall represent the fair value of Company stock on the grant
date.

WHEN OPTIONS ARE EXERCISABLE

     Employees.  Options shall be exercisable by Employees only after such
     ---------
Options have vested.  Furthermore, no options may be exercised, even if vested,
prior to July 1, 2000, except as provided in sub-paragraphs (f) and (a) below.

     Vesting under this Plan is determined by an Employee's length of service
with the Employer, measured from an Employee's date of hire by the Employer,
provided however, that if an Employee's direct prior employer was either
Mechanical Technology, Inc. or Detroit Edison, such Employees prior service
(measured from his date of hire) with either Mechanical Technology, Inc. or
Detroit Edison shall be counted as service for purposes of this Plan.

     Options shall vest as follows.

     (a)  If an Employee has completed 12 months of continuous service as of the
          date of the option grant, such Employee shall immediately be 20%
          vested in the Options granted. If an Employee has not completed 12
          months of continuous service as of the date of Option grant, he shall
          become 20% vested in his Options once he has completed twelve months
          of continuous service.

     (b)  An additional 20% of Options shall vest on the first 12 month
          anniversary from the date of original Option grant.

     (c)  An additional 20% of Options shall vest on the second 12 month
          anniversary from the date of original Option grant.

     (d)  An additional 20% of Options shall vest on the third 12 month
          anniversary from the date of original Option grant.

     (e)  An additional 20% of Options shall vest on the fourth 12 month
          anniversary from the date of original Option grant.

     (f)  All Options originally granted shall become immediately vested and
          exercisable in the event of the sale of all or substantially all of
          the Company's assets, or in the event of the sale of all or
          substantially all of the Company's Class A membership interests.

                                       3
<PAGE>

     (g)  All vested options shall become immediately exercisable in the event
          the Company's Class A membership interests become publicly traded.

     (h)  Notwithstanding sub-paragraphs (a) through (e) above, Options granted
          to Managers, shall vest as follows:

          (1)  50% of Options granted to Managers shall vest immediately upon
               grant.

          (2)  An additional 25% of Options granted to Managers shall vest 12
               months following grant.

          (3)  An additional 25% of Options granted to Managers shall vest 24
               months following date of grant.

     Options granted under this Agreement shall automatically expire, and be
null and void, ten (10) years after the date of grant, except in the death of an
Employee.

     In the event that an Employee's employment shall be terminated for any
reason except death, any Options held by the affected Employee, and exercisable,
must be exercised, if at all, within a period of one (1) month following any
such termination.  Any Options outstanding and not exercised within such one (1)
month period shall become void.  In no event shall this one (1) month period be
in addition to the ten (10) year option periods described in the paragraph
immediately preceding,

     In the event of the death of an Employee while holding Options which were
exercisable on the date of death, the estate or beneficiary of such Employee
shall have the right to exercise any such outstanding Options for a period of
one (1) year following death, even if such extended exercise period extends
beyond the ten (10) year option period.  The Options granted by this agreement
shall not be transferable by the Employee other than by will or the laws of
descent and distribution.

     Consultants.  Options shall be exercisable by Consultants only after such
     -----------
Options have vested.  Furthermore, no options may be exercised, even if vested,
prior to July 1, 2000, except as provided in sub-paragraphs (d) and (e) below.

     Options shall vest as follows:

     (a)  One-third (1/3) of the Options shall vest upon the expiration of
          Consultant's initial contract term.

     (b)  An additional one-third (1/3) of the Options shall vest on the first
          12 month anniversary of the expiration of the initial contract term.

     (c)  The remaining one-third (1/3) of Options shall vest on the second 12
          month anniversary of the expiration of the initial contract term.

                                       4
<PAGE>

     Options shall vest in accordance with the foregoing schedule regardless of
whether Consultant's initial contract terminates prior to the expiration of the
contract term or whether Consultant's contract is renewed.  Vesting, however, is
subject to and contingent upon Consultant complying with the non-compete
obligations set forth in his/her consulting contract. Additionally, should
Consultant, at any time, provide services for, or work for a competing company,
then all outstanding options, whether vested or not, become immediately null and
void.  If for any reason Consultant does not complete the contracted work as is
evident by Consultant receiving less than the original contracted revenue, then
the awarded options will be proportionately reduced to reflect the same
percentage as cash paid versus original contract revenue.

     (d)  Options originally granted shall become immediately vested and
          exercisable in the event of the sale of all or substantially all of
          the Company's assets, or in the event of the sale of all or
          substantially all of the Company's Class A membership interests.

     (e)  All vested options shall become immediately exercisable in the event
          the Company's Class A membership interests become publicly traded.

     Options granted under this Agreement shall automatically expire, and be
null and void, five (5) years after the date of grant, except in the death of a
Consultant.

     In the event of the death of a Consultant while holding Options which were
exercisable on the date of death, the estate or beneficiary of such Consultant
shall have the right to exercise any such outstanding Options for a period of
one (1) year following death, even if such extended exercise period extends
beyond the five (5) year option period.  The Options granted by this agreement
shall not be transferable by the Consultant other than by will or the laws of
descent and distribution.

HOW OPTIONS ARE EXERCISABLE

     An Employee, Consultant or his/her estate or beneficiary shall exercise the
Options granted by this agreement by written notice to the Company, which notice
shall specify the number of Class B membership interests to be purchased, and
which shall be accompanied by a check in full payment of the option price for
such Class B membership interests.  Until such payment, an Employee, Consultant
or his/her estate or beneficiary shall have no rights in the optioned Class B
membership interests.

     Until such time as the Company's membership interests or stock is publicly
traded or until such time that the board of managers amend this agreement, the
Employee and Consultant agrees that all interests purchased by him/her, his/her
estate or beneficiary under the Plan are

                                       5
<PAGE>

acquired for investment and not for distribution. The Employee and Consultant
also agrees that any notice of exercise of the Option shall become accompanied
by a written representation, signed by the Employee and/or Consultant, to that
effect.

     If the Company ever commences a public offering of its securities, it is
likely the Company's membership interests will be reclassified into shares of
common stock.  Such reclassification will be structured so that Employee's
and/or Consultant's percentage of ownership or interest in the Company is not
diluted.  Employees and Consultants also understand that should the Company's
membership interests or stock become publicly traded, there may be certain
restrictions placed on the sale of interests held by Employees and/or
Consultants, and other insiders, for a period of up to one year or longer, as
determined by the underwriter of any such transaction.

     Employees and Consultants further understand that neither the Company, its
officers, nor its board of managers can guarantee or promise that the Company's
membership interests or stock will ever be registered or publicly traded.
Additionally, there may never be a market for any such Company membership
interests or stock, and that such Company membership interests or stock may be
unmarketable.

     The Company shall have no duty or obligation to repurchase any or all of
its outstanding Class B membership interests.

CONTINUED SERVICE

     Employees.  Employee, in consideration of the granting of Options to
     ---------
him/her, agrees that he/she will continue to render services to the Company
except as he/she may be prevented from doing so by death, disability,
retirement, or termination.

     Nothing in the Plan shall be deemed to confer to an Employee any guaranteed
right to continue to be employed by the Company, or interfere in any way with
the right of the Company to terminate his/her employment, as provided by the by-
laws of the Company or as provided by law.

     Consultants.  Nothing in the Plan shall be deemed to confer to a Consultant
     -----------
any guaranteed right to continue to be under contract by the Company, or
interfere in any way with the right of the Company to terminate his/her
contract, as provided by the by-laws of the Company or as provided by law.

TAX EFFECTS

     Employees and Consultants understand that there may be both federal and
state income tax consequences associated with the exercise of the Options
granted by the Plan, including withholding requirements.  Employees acknowledge
that they have conferred with their

                                       6
<PAGE>

respective counsel regarding any and all such tax consequences, and that in no
event shall Company be liable or responsible for any such tax liability.

GOVERNING LAW

     The Plan shall be governed by the law of the State of New York.

     IN WITNESS WHEREOF, Corporation has caused this agreement to be executed on
the date of first above written.

Plug Power, L.L.C.


By:  /s/ Gary Mittleman
   -----------------------------------
     Gary Mittleman
     President Chief Executive Officer

                                       7
<PAGE>

Exhibit A
Stock Option Plan

                               Grant         Option
Employee Name                   Date    Share Price
- -------------                  -----    -----------

ACKER, WILLIAM                02/27/98        $1.00
ACKER, WILLIAM                01/18/99        $5.00
ACKER, WILLIAM                10/01/97        $1.00
ACKERNECT, JON                01/11/99        $5.00
AGEN, CHRISTOPHER             05/17/99        $6.67
ALLEN, GEORGE                 01/22/99        $5.00
ALVARO, ROBERT                02/18/98        $1.00
ALVARO, ROBERT                01/18/99        $5.00
ANTONELLI, GARY D.            10/01/97        $1.00
ANTONELLI, GARY D.            01/18/99        $5.00
AUSTIN, DOUG                  12/21/98        $5.00
BARCOMB, CARLTON              03/29/99        $6.67
BARD, GREG                    11/23/98        $5.00
BARROR, CHRISTOPHER           02/18/99        $6.67
BEBB, DAVID                   07/14/98        $1.00
BEBB, DAVID                   01/18/99        $5.00
BENNER, RONALD                02/22/99        $6.67
BETZ, BILL                    06/22/98        $1.00
BETZ, BILL                    01/18/98        $5.00
BISCEGLIA, BRYAN              03/23/98        $1.00
BISCEGLIA, BRYAN              01/18/99        $5.00
BISCHOFF, TOM                 04/21/99        $6.67
BLY, JEFFREY                  11/23/98        $5.00
BOICE, HAROLD                 03/15/99        $6.67
BOILARD, JOSEPH               09/14/98        $5.00
BOILARD, JOSEPH               01/18/99        $5.00
BOMBARD, DENISE               04/05/99        $6.67
BOUCHEY, DARCY                03/08/99        $6.67
BOWEN, JOHN                   10/06/98        $5.00
BOWEN, JOHN                   01/18/99        $5.00
BOYER, JEFF                   08/06/98        $5.00
BOYER, JEFF                   01/18/99        $5.00
BREITENSTEIN, ADRIAN          06/07/99        $6.67
BROWNELL, ANDREW              04/19/99        $6.67
BRUCK, DANIEL                 03/29/99        $6.67
BRUNNER, ADAM                 10/01/97        $1.00
BRUNNER, ADAM                 01/18/99        $5.00
BUCKNAM, ALLEN                02/27/98        $1.00

                                       1
<PAGE>

BUCKNAM, ALLEN                10/01/97        $1.00
BUCKNAM, ALLEN                01/18/99        $5.00
BUDESHEIM, ERIC               10/01/97        $1.00
BUDESHEIM, ERIC               01/18/99        $5.00
BUESING, DONALD G.            10/01/97        $1.00
BUESING, DONALD G.            01/18/99        $5.00
BUONOME, RALPH                03/01/99        $6.67
BRUCKHARD, RUSSELL            02/15/99        $5.00
CANFIELD, FRANK               07/27/98        $5.00
CANFIELD, FRANK               01/18/99        $5.00
CARLSTROM, CHUCK              01/06/98        $1.00
CARLSTROM, CHUCK              04/29/98        $1.00
CARLSTROM, CHUCK              06/29/98        $1.00
CARLSTROM, CHUCK              01/18/99        $5.00
CERVENY, JOHN                 10/01/97        $1.00
CERVENY, JOHN                 01/18/99        $5.00
CHEN, JEFFREY                 02/04/98        $1.00
CHEN, JEFFREY                 06/29/98        $1.00
CHEN, JEFFREY                 01/18/98        $5.00
CHOW, OSCAR                   01/04/99        $5.00
CHUMMERS, LAURA               12/02/97        $1.00
CHUMMERS, LAURA               01/18/99        $5.00
CLARK, PAUL                   01/18/99        $5.00
COLON, DON                    02/22/99        $6.67
COMI, CHRIS                   01/11/99        $5.00
CROGAN, JASON                 06/15/98        $1.00
CROGAN, JASON                 01/18/99        $5.00
CRONIN, J. CHARLES            04/29/98        $1.00
CRONIN, J. CHARLES            01/18/99        $5.00
CROSIER, JENNIFER             12/14/98        $5.00
CURRY, JOHN                   04/26/99        $6.67
CUSACK, MATTHEW J.            10/01/97        $1.00
CUSACK, MATTHEW J.            01/18/99        $5.00
CYPHERS, TAMARA               05/24/99        $6.67
DANNEHEY, CHRISTOPHER         04/21/98        $1.00
DANNEHEY, CHRISTOPHER         01/18/99        $5.00
DEAN, ROBERT                  02/22/99        $6.67
DEMBROSKY, DANA               03/02/98        $1.00
DEMBROSKY, DANA               01/18/99        $5.00
DEMIRCI, OSMAN                04/05/99        $6.67
DHAR, MANMOHAN                05/14/99        $6.67
DHAR, MANMOHAN                02/27/98        $1.00
DHAR, MANMOHAN                06/29/98        $1.00
DHAR, MANMOHAN                10/01/97        $1.00

                                       2
<PAGE>

DHAR, MANMOHAN                01/18/99        $5.00
DISORDA, STEVE                01/05/98        $1.00
DISORDA, STEVE                01/18/99        $5.00
DORMOND, LOUIS                03/01/99        $6.67
DYNAN, DAVE                   03/01/99        $6.67
EARLE, GEORGE                 03/01/99        $6.67
EDISON DEVELOPMENT CORP.      07/10/97        $1.00
EDISON DEVELOPMENT CORP.      07/16/98        $5.00
EISMAN, GLENN                 06/15/98        $1.00
EISMAN, GLENN                 07/31/98        $5.00
EISMAN, GLENN                 01/18/99        $5.00
EISMAN, GLENN                 05/14/99        $6.67
ENFIELD, DARRYL               03/30/98        $1.00
ENFIELD, DARRYL               01/18/99        $5.00
ERNST, WILLIAM D.             10/01/97        $1.00
ERNST, WILLIAM D.             01/18/99        $5.00
ETHIER, ANNE                  10/19/98        $5.00
ETHIER, ANNE                  01/18/99        $5.00
EVANS, GLENN                  01/19/98        $1.00
EVANS, GLENN                  01/18/99        $5.00
FADELEY, SCOTT                03/16/98        $1.00
FADELEY, SCOTT                01/18/99        $5.00
FARKASH, RON                  02/01/99        $5.00
FARRELL, WILLIAM              04/05/99        $6.67
FEDOROWICZ, GARTH             12/21/98        $5.00
FIORINI, LOU                  03/08/99        $6.67
FOGARTY, JOHN                 06/29/98        $1.00
FOGARTY, JOHN                 01/18/99        $5.00
FRAKES, TIMOTHY               03/29/99        $6.67
GALEANO, ANA-MARIA            10/28/98        $5.00
GALEANO, ANA-MARIA            01/18/99        $5.00
GALEANO, ANA-MARIA            03/24/98        $1.00
GALEANO, JULIE                06/08/98        $1.00
GALEANO, JULIE                01/18/99        $5.00
GARVEY, CHING-HONG            01/11/99        $5.00
GECK, FRIEDRICH               06/07/99        $6.67
GENC, SUAT                    05/31/99        $6.67
GIERISCH, GEORGIANA           12/22/97        $1.00
GIERISCH, GEORGIANA           01/18/99        $5.00
GLICKMAN, BARRY               04/26/99        $6.67
GLYNN, ROBERT                 03/23/98        $1.00
GRAHAM, DAVID                 10/20/97        $1.00
GRAHAM, DAVID                 01/18/99        $5.00
HAACK, DAVID                  03/29/99        $6.67

                                       3
<PAGE>

HALLUM, RYAN                    03/01/99        $6.67
HAMM, ROBERT L.                 10/01/97        $1.00
HAMM, ROBERT L.                 01/18/99        $5.00
HARRINGTON, MARSHA              10/01/97        $1.00
HARRINGTON, MARSHA              01/18/99        $5.00
HARRIS, CHARLES                 02/17/98        $1.00
HARRIS, CHARLES                 01/18/99        $5.00
HEBERT, DAVID                   11/16/98        $5.00
HOCKEY, BERNICE                 03/22/99        $6.67
HOEHN, JAMES                    03/15/99        $6.67
HOYT, ROBERT                    04/26/98        $1.00
HOYT, ROBERT                    01/18/99        $5.00
HUANG, WENHUA                   10/01/97        $1.00
HUANG, WENHUA                   01/18/99        $5.00
HULETT, JOE                     06/07/99        $6.67
HULETT, SCOTT                   05/24/99        $6.67
JAMES, DAVID                    12/14/98        $5.00
JAMES, DAVID                    01/18/99        $5.00
JOHNSON, DARIC                  03/29/99        $6.67
JOHNSON, KATHLEEN               03/29/99        $6.67
JONES, DANIEL O.                10/01/97        $1.00
JONES, DANIEL O.                01/18/99        $5.00
JOURDIN, ALLAN                  01/28/99        $5.00
KAN, WEI-PING                   03/29/99        $6.67
KARUPPAIAH, CHOCKKALINGHAM      10/27/97        $1.00
KARUPPAIAH, CHOCKKALINGHAM      01/18/99        $5.00
KELLY, ALYSSON                  03/02/98        $1.00
KELLY, ALYSSON                  01/18/99        $5.00
KELLY, AMI                      03/02/98        $1.00
KELLY, AMI                      01/18/99        $5.00
KILCHER, JOHN                   04/27/98        $1.00
KILCHER, JOHN                   01/18/99        $5.00
KIRK, PETER                     05/17/99        $6.67
KNAPP, KARL                     10/01/97        $1.00
KNAPP, KARL                     01/18/99        $5.00
KODESCH, STEVEN                 04/19/99        $6.67
KRALICK, JAMES                  02/09/98        $1.00
KRALICKM JAMES                  01/18/99        $5.00
KRASTINS, KENNETH               09/28/98        $5.00
KRASTINS, KENNETH               01/18/99        $5.00
KUECKELS, ERIC                  04/08/99        $6.67
LACY, ROBERT                    05/11/98        $1.00
LACY, ROBERT                    01/18/99        $5.00
LAPIETRO, ROBERT                06/14/99        $6.67

<PAGE>

LARGENT, BILL                  05/17/99             $6.67
LATTIMORE, MAURIE              11/16/98             $5.00
LATTIMORE, MAURIE              01/18/99             $5.00
LAW, JOHN                      03/30/98             $1.00
LAW, JOHN                      06/29/98             $1.00
LAW, JOHN                      01/18/99             $5.00
LAW, JOHN                      05/14/98             $6.67
LEE, MELANIE                   04/29/99             $6.67
LEET, RANDY                    11/13/97             $1.00
LEET, RANDY                    01/18/99             $5.00
LEONARD, TINA S.               10/01/97             $1.00
LEONARD, TINA S.               10/28/98             $5.00
LEONARD, TINA S.               01/18/99             $5.00
LETKO, JOHN                    02/01/99             $5.00
LEWIS, PHILIP                  10/01/97             $1.00
LEWIS, PHILIP                  01/18/99             $5.00
LOVE, JOHN                     02/23/98             $1.00
LOVE, JOHN                     01/18/99             $5.00
LYONS, SEAN                    11/23/98             $5.00
MACCUE, SANDRA E.              10/01/97             $1.00
MACCUE, SANDRA E.              01/18/99             $5.00
MACCUE, SANDY                  04/19/99             $6.67
MADDALONI, RICHARD E.          10/01/97             $1.00
MADDALONI, RICHARD E.          01/18/99             $5.00
MARONCELLI, MARK               06/07/99             $6.67
MARSHALL, DAVID                03/29/99             $6.67
MARVIN, RUSSEL                 01/12/98             $1.00
MARVIN, RUSSEL                 01/12/98             $1.00
MAS, CARL                      06/07/99             $6.67
MASTERSON, NICOLE              04/05/99             $6.67
MATLOCK, RICHARD               03/23/98             $1.00
MATLOCK, RICHARD               01/18/99             $5.00
MATTICE, SHEILA                05/17/99             $6.67
MAYNARD, WILLIAM B.            10/01/97             $1.00
MAYNARD, WILLIAM B.            01/18/99             $5.00
MCARDLE, BILL                  05/24/99             $6.67
MCELROY, JAMES                 02/15/99             $5.00
MCNAMEE, GEORGE - BOARD        07/10/97             $1.00
MCNAMEE, GEORGE - BOARD        07/16/98             $5.00
MEASE, KEVIN                   01/11/99             $5.00
MEIER, GARY                    12/21/98             $5.00
MEREDITH, JON                  01/18/99             $5.00
MIGIRDITCH, GREG M.            10/01/97             $1.00
MIGIRDITCH, GREG M.            01/18/99             $5.00







<PAGE>

QUICK, ROBERT               08/10/98               $5.00
QUICK, ROBERT               01/18/99               $5.00
RATHBURN, ROBERT            03/30/98               $1.00
RATHBURN, ROBERT            01/18/99               $5.00
REMILLARD, MATTHEW          10/01/97               $1.00
REMILLARD, MATTHEW          01/18/99               $5.00
RHODES, THOMAS              10/01/97               $1.00
RHODES, THOMAS              01/18/99               $5.00
RIBSAMEN, FOSTER            02/10/98               $1.00
RIBSAMEN, FOSTER            01/18/99               $5.00
RICHARDSON, CURTIS          03/15/99               $6.67
ROBB, WALTER-BOARD          07/10/97               $1.00
ROBB, WALTER-BOARD          07/16/98               $5.00
ROBERTS, GRANT              02/17/98               $1.00
ROBERTS, GRANT              01/18/99               $5.00
ROBERTSON, RICHARD          05/04/98               $1.00
ROBERTSON, RICHARD          01/18/99               $5.00
ROBINSON, DAVID             07/27/98               $5.00
ROBINSON, DAVID             01/18/99               $5.00
ROCK, DEBRA                 12/15/97               $1.00
ROCK, DEBRA                 01/18/99               $5.00
RODRIGUEZ, DANIEL           02/22/99               $6.67
ROLLINS, DAVID              04/05/99               $6.67
ROSSI, EUGENE               12/14/98               $5.00
ROSSI, EUGENE               01/18/99               $5.00
RUSH, KENNETH               06/22/98               $1.00
RUSH, KENNETH               01/18/99               $5.00
SANDERSON, DEREK            05/26/99               $6.67
SANKEL, BRIAN               02/22/99               $6.67
SCHAFER, GUNTER             06/03/99               $6.67
SCHREIBER, DIANE            04/19/99               $6.67
SCOTT, BRUCE                03/30/98               $1.00
SCOTT, BRUCE                01/18/99               $5.00
SCOVELLO, FRANK             04/26/99               $6.67
SHAPIRO, CHANAN             07/13/98               $1.00
SHAPIRO, CHANAN             01/18/99               $5.00
SHERRY, JAMES               04/05/99               $6.67
SHERWIN, GREG               02/22/99               $6.67
SILER, DAVID N.             10/01/97               $1.00
SILER, DAVID N.             01/18/99               $5.00
SILVESTRI, GREG             06/14/99               $6.67
SKIDMORE, DUSTAN            05/18/99               $6.67
SKRZYCKE, DEAN              01/19/98               $1.00
SKRZYCKE, DEAN              01/18/99               $5.00

<PAGE>

MIKLAS, RICHARD              01/28/99    $5.00
MILLER, MATTHEW              05/04/98    $1.00
MILLER, MATTHEW              01/18/99    $5.00
MITTLEMAN, GARY              06/28/97    $1.00
MITTLEMAN, GARY              07/16/98    $5.00
MOUSAW, JOHN                 10/29/98    $5.00
MOUSAW, JOHN                 01/18/99    $5.00
MUELLER, JOHN                01/25/99    $5.00
NELSON, MILTON               09/10/98    $5.00
NELSON, MILTON               01/18/99    $5.00
NELSON, CAROL                03/22/99    $6.67
NESTLER, EDWARD JR.          04/06/98    $1.00
NESTLER, EDWARD JR.          01/18/99    $5.00
NESTLER, EDWARD SR.          10/01/97    $1.00
NESTLER, EDWARD SR.          01/18/99    $5.00
NEUMANN, DAVID               10/28/98    $5.00
NEUMANN, DAVID               12/15/97    $1.00
NEUMANN, DAVID               01/18/99    $5.00
NIEDZIEJKO, EDWARD           05/24/99    $6.67
NOLAN, JOHN                  04/26/99    $6.67
O'HARA, SCOTT                06/10/99    $6.67
OKO, URIEL                   06/08/98    $1.00
OKO, URIEL                   01/18/99    $5.00
OYEROKUN, FOLUSHO            01/12/98    $1.00
OYEROKUN, FOLUSHO            01/18/99    $5.00
PATTI, DAVID                 02/15/99    $5.00
PESCHKE, NORM                12/07/98    $5.00
PESCHKE, NORM                01/18/99    $5.00
PICCIRILLO, NICK             11/23/98    $5.00
PICCIRILLO, NICK             01/18/99    $5.00
PIMENTEL, CHARLES            04/12/99    $6.67
PITTS, LARRY                 07/27/98    $5.00
PITTS, LARRY                 01/18/99    $5.00
POMYKAI, MICHAEL             10/19/98    $5.00
POWER, ROBERT                08/10/98    $5.00
POWER, ROBERT                01/18/99    $5.00
PRESCOTT, GARNET             02/08/99    $5.00
PRESTIPINO, JOHN             07/27/98    $5.00
PRESTIPINO, JOHN             01/18/99    $5.00
PREVISH, TOM                 07/01/98    $1.00
PREVISH, TOM                 01/18/99    $5.00
PURNER, JEFF                 01/18/99    $5.00
PUSTOLKA, MARK               02/22/99    $6.67
QUERRARD, DAVID              05/24/99    $6.67

                                       6
<PAGE>

SMITH, DAVID                   04/13/98    $1.00
SMITH, DAVID                   01/18/99    $5.00
SMITH, DOUGLAS                 02/08/99    $5.00
SPARGO, TRACY                  04/12/99    $6.67
STANTON, ROBERT                03/02/98    $1.00
STANTON, ROBERT                01/18/99    $5.00
STERNLICHT, BENO-BOARD         07/10/97    $1.00
STERNLICHT, BENO-BOARD         07/16/98    $5.00
SUMIGRAY, WILLIAM P.           10/01/97    $1.00
SUMIGRAY, WILLIAM P.           01/18/99    $5.00
SUWALSKI, HENRY                03/22/99    $6.67
TANG, CHING-JEN                04/19/99    $6.67
THOMAS, MARK                   06/14/99    $6.67
TOEPFER, TIM                   01/25/99    $5.00
TOMSON, LOU                    01/11/99    $5.00
TOMSON, LOU                    05/14/99    $6.67
VANHEERTUM III, JOHN           10/01/97    $1.00
VANHEERTUM III, JOHN           01/18/99    $5.00
VARIN, ROGER                   04/27/98    $1.00
VARIN, ROGER                   01/18/99    $5.00
WARREN, DAVID                  03/02/98    $1.00
WARREN, DAVID                  01/18/99    $5.00
WHEELER, MARIE                 05/24/99    $6.67
WHIPPLE, KATHRYN               03/16/98    $1.00
WHIPPLE, KATHRYN               01/18/99    $5.00
WHITE, ERIC                    02/02/98    $1.00
WHITE, ERIC                    07/07/98    $1.00
WHITE, ERIC                    01/18/99    $5.00
WILSHIRE, SCOTT                03/08/99    $6.67
WINCHELL, JOHN                 01/04/99    $5.00
WINSLOW, ALAN                  07/30/98    $5.00
WINSLOW, ALAN                  01/18/99    $5.00
WOOD, AMY                      05/26/98    $1.00
WOOD, AMY                      01/18/99    $5.00
WOOLLEY, DAN                   01/13/99    $5.00
WU, YAOBANG                    01/12/98    $1.00
WU, YAOBANG                    01/18/99    $1.00
ZEMSKY, JEFF                   01/18/99    $5.00
ZIELINSKI, WIESLAW             05/24/99    $6.67
MITTLEMAN, GARY                07/19/99   $11.00
CREWELL, GARY                  07/26/99   $11.00
DAIGNEAULT, MARK               07/26/99   $11.00
HARDWICKE, TED                 07/26/99   $11.00
TANGUAY, SCOTT                 07/26/99   $11.00

                                       8
<PAGE>

DAGOSTINO, ANTHONY                07/26/99             $11.00
SCRIVEN, TROY                     07/26/99             $11.00
DLEO, JAMES                       07/26/99             $11.00
MARE, TRAVIS                      07/26/99             $11.00
SCHIMER, JAMIE                    07/26/99             $11.00
TRAVER, ROB                       07/26/99             $11.00
WHALEN, BRYAN                     07/26/99             $11.00
POWER, DAN                        07/26/99             $11.00
BAGSTAD, BRUCE                    07/26/99             $11.00
HIERONYMI, MARTIN                 07/26/99             $11.00
POWELL, PARKER                    07/26/99             $11.00
BECKER, JAMIE                     07/26/99             $11.00
BUELTE, STEVE                     07/26/99             $11.00
LATORRE, MARIA                    07/26/99             $11.00
BARKALOW, TOM                     07/26/99             $11.00
VAINAUSKAS, PAUL                  07/29/99             $11.00
SCHAFER, JENNIFER                 08/02/99             $11.00
GOLIBER, JOHN                     08/09/99             $11.00
KIRCHOFF, DAVID                   08/09/99             $11.00
LEZBERG, ROBERT                   08/11/99             $11.00


<PAGE>

                              PLUG POWER, L.L.C.

                                   Exhibit B



                                                Option
Director Name                   Grant Date      Share Price     Shares
- -------------                   ----------      -----------     ------

Beno Sternlicht                 07/10/97        $1.00           50,000
                                07/16/98        $5.00           10,000

George McNamee                  07/10/97        $1.00          100,000
                                07/16/98        $5.00           10,000

Walter Robb                     07/10/97        $1.00           50,000
                                                $5.00           10,000

EDC                             07/10/97        $1.00          200,000
                                07/16/98        $5.00           30,000


<PAGE>

                              POWER PLUG, L.L.C.

                                   Exhibit C



                                                 Option
Consultant                  Grant Date           Share Price        Shares
- ----------                  ----------           -----------        ------

Jim Mcelroy                 02/15/99             $ 5.00             15,000
                            07/26/99             $11.00              6,000

Mike Walsh                  07/26/99             $11.00              6,000

<PAGE>

                              FIRST AMENDMENT TO
                       SECOND AMENDMENT AND RESTATEMENT
                                    OF THE
                            MEMBERSHIP OPTION PLAN

                              PLUG POWER, L.L.C.


     This First Amendment to Second Amendment and Restatement of the Membership
Option Plan (the "Option Plan") is effective as of first day of October, 1999,
and amends the Option Plan, dated as of February 15, 1999;

     WHEREAS, Plug Power, L.L.C. (the "Company") desires to amend the Option
Plan to provide for the ability of the Company to vary the terms of vesting and
exercisability of options granted under the Option Plan;

     WHEREAS, at a meeting of the Members of the Company held on October 1,
1999, at which all Members were present, either by person or by telephone, and
acting with full authority, the Members agreed to amend the Option Plan, as set
forth below;

     NOW, THEREFORE, the Option Plan is hereby amended as follows:

1.   On page 5 of the Option Plan, before the title "How Options Are
Exercisable", insert the following sentence in a new paragraph:

"Notwithstanding anything to the contrary provided herein, the Company may, at
its option, provide for different time limitations for vesting and
exercisability of Options by written agreement with the grantee of such
options."

2.   The remainder of the Option Plan shall continue in full force and effect.


<PAGE>

                                                                     EXHIBIT 5.1



                               November 3, 1999

Plug Power Inc.
968 Albany-Shaker Road
Latham, New York 12110

Ladies and Gentlemen:

     Re:  Registration Statement on Form S-8
          ----------------------------------

     This opinion is delivered in our capacity as counsel to Plug Power Inc.
(the "Company") in connection with the preparation and filing with the
Securities and Exchange Commission under the Securities Act of 1933, as amended
(the "Act"), of a Registration Statement on Form S-8 (the "Registration
Statement") relating to 5,671,191 shares of Common Stock, par value $.01 per
share (the "Registered Shares"), which the Company may issue pursuant to its
1997 Membership Option Plan and 1999 Stock Option and Incentive Plan, each as
amended (the "Plans").

     As counsel for the Company, we have examined a copy of the Plans and the
Company's Amended and Restated Certificate of Incorporation and the Company's
Amended and Restated By-laws, each as presently in effect, and such records,
certificates and other documents of the Company as we have deemed necessary or
appropriate for the purposes of this opinion.

     We are attorneys admitted to practice in The Commonwealth of Massachusetts.
We express no opinion concerning the laws of any jurisdiction other than the
laws of the United States of America, The Commonwealth of Massachusetts and the
State of Delaware.

     Based on the foregoing, we are of the opinion that upon the issuance and
delivery of the Registered Shares against payment therefor in accordance with
the terms of the Plan and any agreement thereunder, the Registered Shares will
be legally issued, fully paid and non-assessable shares of the Company's Common
Stock.

     The foregoing assumes all requisite steps will be taken to comply with the
requirements of the Act, applicable requirements of state laws regulating the
offer and sale of securities and applicable requirements of The Nasdaq Stock
Market, Inc.

     We hereby consent to being named as counsel to the Company in the
Registration Statement and to the inclusion of this opinion as an exhibit to the
Registration Statement.

                              Very truly yours,

                              /s/ Goodwin, Procter & Hoar LLP

                              GOODWIN, PROCTER & HOAR LLP

<PAGE>

                                                                    EXHIBIT 23.2


                      CONSENT OF INDEPENDENT ACCOUNTANTS
                      ----------------------------------


We hereby consent to the incorporation by reference in this Registration
Statement on Form S-8 of our report dated April 9, 1999 relating to the
financial statements of Plug Power LLC (a development stage enterprise), which
appears in the Company's Registration Statement on Form S-1 dated October 28,
1999.




PricewaterhouseCoopers LLP


Albany, New York
November 3, 1999





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