Exhibit 2.1


                          AGREEMENT AND PLAN OF MERGER

                                 BY AND BETWEEN

                                PLUG POWER INC.
                             a Delaware corporation

                                      AND

                                PLUG POWER, LLC
                      a Delaware limited liability company


     THIS AGREEMENT AND PLAN OF MERGER (the "Merger Agreement") is made and
entered into as of October 7, by and among Plug Power, LLC, a Delaware
limited liability company (the "Merging Company"), and Plug Power Inc., a
Delaware corporation (the "Surviving Company").


     WHEREAS, the Merging Company is a limited liability company duly organized
and existing under the laws of the State of Delaware and the Surviving Company
is a corporation duly organized and existing under the laws of the State of
Delaware;

     WHEREAS, the Surviving Company is a wholly-owned subsidiary of the Merging
Company;

     WHEREAS, the Board of Directors of the Surviving Company and the Managers
and Members of the Merging Company have determined that it is advisable and to
the advantage of each of the Merging Company and the Surviving Company to merge
upon the terms and conditions herein provided, in accordance with the applicable
provisions of the statutes of the State of Delaware;

     NOW THEREFORE, in consideration of the mutual agreements and covenants set
forth herein, the Merging Company and the Surviving Company agree to merge as
follows:

                                   THE MERGER

     1.01.  The Merger.  In accordance with the provisions of this Merger
            ----------
Agreement and the Delaware General Corporation Law (the "DGCL") and the Delaware
Limited Liability Company Act (the "DLLCA"), the Merging Company will be merged
with and into the Surviving Company (the "Merger") at the Effective Time (as
hereinafter defined).  Following the Effective Time, the identity and separate
existence of the Merging Company shall cease and all of the rights, titles,


privileges, powers, franchises, properties, and assets of the Merging Company of
any kind or nature shall be vested in the Surviving Company, and all debts,
liabilities, duties and other obligations of the Merging Company shall attach to
the Surviving Company, and, following the Effective Time, the Surviving Company
shall continue its existence as a corporation, and the identity, rights, titles,
privileges, powers, franchises, properties and assets of the Surviving Company
shall continue unaffected and unimpaired by the Merger.


     1.02.  Effective Time and Date.  The Merging Company and the Surviving
            -----------------------
Company shall cause the Merger to be consummated by filing a Certificate of
Merger with the Secretary of State of the State of Delaware in such form as
required by, and executed in accordance with, the DGCL and the DLLCA. The term
"Effective Time" shall mean 10 am on the date of consummation of the Initial
Public Offering of the Surviving Company's common stock.


     1.03.  Organizational Documents.  The Certificate of Incorporation and
            ------------------------
By-laws of the Surviving Company immediately prior to the Effective Time shall
remain in effect until further amended as provided therein or as provided by
law.  No amendments or changes to the Certificate of Incorporation and By-laws
of the Surviving Company shall be effected by the Merger.

     1.04.     Common Stock; Membership Interests
               ----------------------------------

               (a) At the Effective Time, each share of Surviving Company Common
     Stock then outstanding shall, by virtue of the Merger and without any
     action on the part of any holder thereof, cease to be outstanding and shall
     be cancelled and retired and shall cease to exist.

               (b) At the Effective Time, each share of Merging Company Class A
     Membership Interests and Class B Membership Interests then outstanding
     shall, by virtue of the Merger and without any action on the part of any
     holder thereof, be converted into the right to receive one (1) fully paid
     and non-assessable share of Surviving Company Common Stock.

               (c) At the Effective Time, each right to acquire a share of
     Merging Company Class A Membership Interests or Class B Membership
     Interests upon the conversion or exercise of any then outstanding options,
     warrants or other derivative securities of the Company, shall by virtue of
     the Merger and without any action on the part of any holder thereof, be
     converted into the right to acquire, at the same exercise price and upon
     the same vesting provisions and other terms thereof, one (1) fully paid and
     non-assessable share of Surviving Company Common Stock upon the conversion
     or exercise of such option, warrant or other derivative security.

     1.05.  Additional Actions.  If, at any time on and after the Effective
            ------------------
Time, the Surviving Company or its successors and assigns shall consider or be
advised that any further assignments or assurances in law or any organizational
or other acts are necessary or desirable (a) to vest,

                                       2


perfect or confirm, of record or otherwise, in the Surviving Company title to
and possession of any property or right of the Merging Company acquired or to be
acquired by reason of, or as a result of, the Merger, or (b) otherwise to carry
out the purposes of the Merger Agreement, the Merging Company and its members,
managers and officers shall be deemed to have granted to the Surviving Company
an irrevocable power of attorney to execute and deliver all such proper deeds,
assignments and assurances in law and to do all acts necessary or proper to
vest, perfect or confirm title to and possession of such property or rights in
the Surviving Company and otherwise to carry out the purposes of the Merger
Agreement; and the directors and officers of the Surviving Company are fully
authorized in the name of the Merging Company or otherwise to take any and all
such action.

     1.06.  Amendment and Abandonment.  Subject to applicable law, at any
            -------------------------
time prior to the Effective Time, the officer(s) and director(s) of the
Surviving Company and the managers or members of the Merging Company may amend
or abandon the Merger Agreement, without the vote of the constituent
stockholders or members, respectively.


                       *    *    *    *     *    *    *

                                       3


     IN WITNESS WHEREOF, this Merger Agreement is hereby executed as of the date
first above written on behalf of the Merging Company and the Surviving Company.


                           SURVIVING COMPANY
                           -----------------

                           PLUG POWER INC.,
                           a Delaware corporation


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



                           MERGING COMPANY
                           ---------------

                           PLUG POWER, LLC,
                           a Delaware limited liability company


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



                                       4