SATCON TECHNOLOGY CORP
SC 13D, 1997-06-09
COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH
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<PAGE>
 
                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549

                                  SCHEDULE 13D

                   Under the Securities Exchange Act of 1934
                         (Amendment No.            )*
                                       ------------
 
                         SatCon Technology Corporation
- --------------------------------------------------------------------------------
                               (Name of Issuer)
 
                                 Common Stock
- --------------------------------------------------------------------------------
                        (Title of Class of Securities)

 
                                   803893106
                       --------------------------------
                                (CUSIP Number)

 
 
Anthony J. Villiotti, Duquesne Enterprises, Inc., One NorthShore Center, Suite
                  100, Pittsburgh, PA  15212  (412) 231-3786
- -------------------------------------------------------------------------------
          (Name, Address and Telephone Number of Person Authorized to
                      Receive Notices and Communications)
 
                                 May 28, 1997
            -------------------------------------------------------
            (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box [ ].

Check  the  following  box  if  a  fee  is being  paid  with  the statement
[X].  (A fee is not required only if the reporting person:  (1) has a previous
statement on file reporting beneficial ownership of more than five percent of
the class of securities described in Item 1; and (2) has filed no amendment
subsequent thereto reporting beneficial ownership of five percent or less of
such class.)  (See Rule 13d-7.)

Note:  Six copies of this statement, including all exhibits, should be filed
with the Commission.  See Rule 13d-1(a) for other parties to whom copies are to
be sent.

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject lass of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).
<PAGE>
 
                                  SCHEDULE 13D


CUSIP No.  803893106                               Page      2  of      7  Pages
 
 
1  NAME OF REPORTING PERSON
   S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
 
       Duquesne Enterprises, Inc.
 
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                    (a) [ ]
                           
                                                                        (b) [ ]
 
 
3  SEC USE ONLY
 
 
4  SOURCE OF FUNDS*
      WC
 
5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO 
   ITEMS 2(d) or 2(e)                                                       [ ]
 
 
6  CITIZENSHIP OR PLACE OF ORGANIZATION
      Pennsylvania
 
                   7  SOLE VOTING POWER
 NUMBER OF               798,138
  SHARES
BENEFICIALLY       8  SHARED VOTING POWER
 OWNED BY                0
  EACH 
REPORTING          9  SOLE DISPOSITIVE POWER
 PERSON                  798,138
  WITH 
                  10  SHARED DISPOSITIVE POWER
                         0
 

11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
    798,138
 
12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                           [ ]
 
13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
    9.2%
 
14 TYPE OF REPORTING PERSON*
    CO
 

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE RESPONSES TO ITEMS 1-7.
<PAGE>
 
Item 1.   Security and Issuer

          The title and class of equity securities to which this statement
relates is common stock, par value $.01 per share (the "Common Stock"), of
SatCon Technology Corporation (the "Issuer").  The principal executive offices
of the Issuer are located at 161 First Street, Cambridge, Massachusetts 02142.


Item 2.   Identity and Background

          This statement is filed by Duquesne Enterprises, Inc., a Pennsylvania
corporation ("DE") principally involved in making strategic investments
beneficial to the core energy business of its parent, DQE, Inc. ("DQE").  DE's
principal executive offices are located at One NorthShore Center, 12 Federal
Street, Suite 100, Pittsburgh, Pennsylvania 15212.

          DE is a wholly-owned subsidiary of DQE, a Pennsylvania corporation.
DQE is a public utility holding company exempt from registration under the
Public Utility Holding Company Act of 1935, as amended from time to time,
pursuant to Section 3(a)(1) thereof.  DQE's principal executive offices are
located at Cherrington Corporate Center, Suite 100, 500 Cherrington Parkway,
Coraopolis, Pennsylvania 15108.

          The name, business address, present principal occupation or employment
and citizenship of each of the executive officers and directors of DE and DQE
are set forth in Schedule 1 hereto, and are incorporated by reference herein.

          During the last five years, none of DE, nor, to the best of DE's
knowledge, DQE or any of DE's or DQE's executive officers and directors has been
convicted in any criminal proceeding (excluding traffic violations or similar
misdemeanors), nor been party to any civil proceeding of a judicial or
administrative body of competent jurisdiction resulting in a judgment, decree or
final order enjoining future violations of, or prohibiting or mandating
activities subject to, federal or state securities laws or finding any violation
with respect to such laws.


Item 3.   Source and Amount of Funds or Other Consideration

          DE purchased the 798,138 shares of Common Stock with funds obtained
from the working capital of DE.  The aggregate purchase price for the Common
Stock was $5,000,000.


Item 4.   Purpose of Transaction

          DE acquired the shares of Common Stock as a long-term investment in
the Issuer and as part of the formation of a strategic partnership with the
Issuer to commercialize flywheel energy storage system technology for stationary
power applications.  DE does not presently intend to acquire control over the
Issuer.  To the knowledge of DE, none of DQE nor any of DE's or DQE's executive
officers or directors presently intends to acquire control over the Issuer.
However, if DE believes that further investment in the Issuer is attractive,
whether because of the market price of the Issuer's securities or otherwise, DE
may acquire additional shares of the Common Stock or other securities of the
Issuer.  Similarly, subject to applicable law, and depending upon market and
other factors, DE may from time to time determine to dispose of some or all of
the Common Stock.

                                       3
<PAGE>
 
          DE purchased the Common Stock pursuant to the terms of a Securities
Purchase Agreement, dated as of May 28, 1997 (the "Purchase agreement"), among
the Issuer, Beacon Power Corporation, a newly-formed subsidiary of the Issuer
("BPC") and DE.  Pursuant to the Purchase Agreement, the Issuer will invest the
$5,000,000 purchase price paid by DE for the Common Stock toward the
establishment of BPC, which will manufacture and distribute the Issuer's
flywheel energy storage system.  DE will actively participate in developing new
business for such systems and shall distribute the Issuer's energy products in
seven mid-Atlantic states and the District of Columbia.  So long as DE owns at
least 5% of the Issuer's outstanding Common Stock, DE will have the power to
nominate one member of the Issuer's seven-member board of directors.

          DE has received a warrant (the "Warrant"), exercisable for up to
500,000 shares of BPC common stock at a purchase price of $6.00 per share.  The
Warrant terminates on May 28, 1999.  So long as DE owns at least 50% of the
Issuer's Common Stock acquired under the Purchase Agreement or 50% of the BPC
common stock that may be acquired under the Warrant, DE will have the power to
nominate one member of BPC's seven-member board of directors.  In addition, if
the Warrant is exercised, DE shall be entitled to participate on the same terms
and conditions, including price, as the other participants in any private
offering of equity securities of BPC to the extent necessary to permit DE to own
a total of 20% of the voting securities of BPC (including all shares acquired
upon exercise of the Warrant, and assuming the Warrant is exercised in full).

          The foregoing summaries of certain provisions of the Purchase
Agreement and the Warrant are not intended to be complete and are qualified in
their entirety by reference to the copies thereof filed as exhibits hereto.

          Except as described above, DE has no plans or proposals which relate
to or would result in the occurrence of any of the transactions or events
described in paragraphs (a) through (j) of Item 4 of Schedule 13D.


Item 5.   Interest in Securities of the Issuer

          (a) To the knowledge of DE, the Issuer has outstanding 8,706,213
shares of Common Stock, of which DE owns 798,138 shares ( approximately 9.2%).
To the knowledge of DE, none of DQE nor any of DE's or DQE's executive officers
or directors have any interest in, power to vote or direct the vote of, or power
to dispose or direct the disposition of any shares of Common Stock.

          (b) DE has the sole power to vote and the sole power to dispose of all
798,138 shares of Common Stock described in (a) above.

          (c) Other than the transactions described above, DE has not entered
into any transaction regarding the securities of the Issuer during the last 60
days.  To the knowledge of DE, none of DQE nor any of DE's or DQE's executive
officers and directors have entered into any transaction regarding the
securities of the Issuer during the last 60 days.

            (d) Not applicable.

            (e) Not applicable.

                                       4
<PAGE>
 
Item 6.   Contracts, Arrangements, Understanding or Relationships With
          Respect to Securities of the Issuer

          DE, the Issuer and BPC are parties to a Registration Rights Agreement,
dated May 28, 1997, pursuant to which DE has one-time demand registration rights
with respect to the shares of Common Stock purchased under the Purchase
Agreement, and "piggy-back" registration rights with respect to shares of BPC
common stock which may be acquired under the Warrant.  The Issuer or BPC, as the
case may be, shall pay all expenses of any registration effected pursuant to the
Registration Rights Agreement, other than underwriting discounts and
commissions.

          The foregoing summary of certain provisions of the Registration Rights
Agreement is not intended to be complete and is qualified in its entirety by
reference to the copy thereof filed as an exhibit hereto.


Item 7.   Material to be Filed as Exhibits

Schedule 1  Information regarding  DE's and DQE's executive officers and
            directors

Exhibit A   Securities Purchase Agreement, dated as of May 28, 1997, among the
            Issuer, BPC and DE

Exhibit B   Registration Rights Agreement, dated May 28, 1997, among the Issuer,
            BPC and DE

Exhibit C   Warrant for 500,000 shares of BPC common stock, in favor of DE


Signature

          After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

Date:  June 6, 1997                   DUQUESNE ENTERPRISES, INC.



                                      By    /s/ Anthony J. Villiotti
                                        ----------------------------
                                      Name:  Anthony J. Villiotti
                                      Title:  Vice President

                                       5
<PAGE>
 
                                   SCHEDULE 1
     Information Regarding DE's and DQE's Executive Officers and Directors


          Set forth below are the names and position of the executive officers
and directors of DE and DQE.  Unless otherwise specified, each person is a
citizen of the United States of America.  Unless otherwise specified, the
principal business address for each person is 411 Seventh Avenue, Pittsburgh,
Pennsylvania 15219.

Name        Principal Occupation or Employment and Business Address (if other
- ----        than as indicated above)
            ------------------------------------------------------------------

DE EXECUTIVE OFFICERS:

 Thomas A. Hurkmans    President; One NorthShore Center, 12 Federal Street, 
                       Suite 100, Pittsburgh, Pennsylvania 15212

 Anthony J. Villiotti  Vice President, Treasurer and Controller; One NorthShore
                       Center, 12 Federal Street, Suite 100, Pittsburgh,
                       Pennsylvania 15212

 Diane S. Eismont      Secretary of DE; Corporate Secretary of DQE; Corporate
                       Secretary and Assistant General Counsel of Duquesne Light
                       Company


DE DIRECTORS:

 David D. Marshall     President and Chief Executive Officer of DQE and Duquesne
                       Light  Company

 Gary L. Schwass       Executive Vice President and Chief Financial Officer of 
                       DQE; Senior Vice President and Chief Financial Officer of
                       Duquesne Light Company

 James D. Mitchell     Vice President of DQE



DQE EXECUTIVE OFFICERS:

 David D. Marshall     President and Chief Executive Officer of DQE and Duquesne
                       Light  Company

 Gary L. Schwass       Executive Vice President and Chief Financial Officer of 
                       DQE; Senior Vice President and Chief Financial Officer of
                       Duquesne Light Company

 Victor A. Roque       Vice President and General Counsel of DQE and Duquesne 
                       Light Company

 James D. Mitchell     Vice President of DQE

 Jack E. Saxer, Jr.    Vice President of DQE and Assistant Vice President of
                       Duquesne Light Company

                                       6
<PAGE>
 
 Morgan K. O'Brien     Controller of DQE and Duquesne Light Company

 Donald J. Clayton     Treasurer of DQE and Duquesne Light Company



DQE DIRECTORS:

 Daniel Berg           Institute Professor and Acting Director, Services 
                       Research and Education Center, of Rensselaer Polytechnic
                       Institute. 
                       CII-05015 Troy, New York 12180-3590

 Doreen E. Boyce       President of the Buhl Foundation (Support of educational
                       and community programs)
                       Four Gateway Center 
                       Pittsburgh, Pennsylvania 15222

 Robert P. Bozzone     Vice Chairman of Allegheny Teledyne, Inc. (specialty 
                       metals production)
                       1000 Six PPG Place
                       Pittsburgh, Pennsylvania 15222

 Sigo Falk             Personal Investments
                       3315 Grant Building
                       Pittsburgh, Pennsylvania 15219

 William Knoell        Retired
                       9 Twickenham
                       Hilton Head Island, South Carolina 29928

 David D. Marshall     President and Chief Executive Officer of DQE and Duquesne
                       Light Company

 Robert Mehrabian      President Emeritus and Professor of Materials Science and
                       Engineering,
                       Carnegie Mellon University
                       5000 Forbes Avenue
                       Pittsburgh, Pennsylvania 15213

 Thomas J. Murrin      Dean, A.J. Palumbo School of Business Administration of
                       Duquesne University
                       405 Rockwell Hall
                       Pittsburgh, Pennsylvania 15282

 Eric W. Springer      Partner of Horty, Springer & Mattern, P.C. (attorneys-
                       at-law)
                       4614 Fifth Avenue
                       Pittsburgh, Pennsylvania 15213

                                       7
<PAGE>
 
                                   Exhibit A
                                   ---------


                         SECURITIES PURCHASE AGREEMENT
                         -----------------------------



     THIS SECURITIES PURCHASE AGREEMENT ("Agreement") dated as of the 28th day
of May, 1997, is entered into by and among SatCon Technology Corporation, a
Delaware corporation (the "Company"), Beacon Power Corporation, a Delaware
corporation ("BPC"), and Duquesne Enterprises, a Pennsylvania corporation (the
"Purchaser").

                                  WITNESSETH:

     WHEREAS, the Company is in need of capital in order to develop BPC and,
subject to the fulfillment of the terms and conditions set forth herein, the
Purchaser is willing to provide such capital by purchasing shares of the
Company's common stock, $.01 par value per share ("Common Stock"), at a purchase
price determined in accordance with the terms set forth herein, in connection
with which BPC shall issue to the Company and the Company shall transfer to the
Purchaser a warrant substantially in the form attached hereto as Exhibit A (the
                                                                 ---------     
"Warrant").

     NOW THEREFORE, intending to be legally bound hereby, the parties hereto
agree as follows:


I.  Preambles; Purchase and Sale; Issuance of Warrant; Closing; Termination of
    --------------------------------------------------------------------------
    Agreement.
    --------- 

     1.1  Preambles.  The preambles are incorporated herein as fully as if set
          ---------                                                           
forth herein.

     1.2  Purchase and Sale; Issuance of Warrant.  Subject to the terms and
          --------------------------------------                           
conditions set forth in this Agreement, on the Closing Date (as hereinafter
defined): (a) the Purchaser shall purchase from the Company and the Company
shall issue, sell and deliver to the Purchaser the number of shares of Common
Stock which shall be equal to  $5,000,000 divided by the average last sales
price for shares of the Common Stock as reported on the Nasdaq National Market
on the 30 trading days immediately prior to the earlier of (i) the fifth trading
day prior to the Closing (as
<PAGE>
 
hereinafter defined) under this Agreement, or (ii) the public announcement of
the transactions contemplated by this Agreement, and (b) the Company shall
deliver to the Purchaser the Warrant previously issued to the Company by BPC.

     1.3  Closing.  The consummation of the transactions referred to in Section
          -------                                                              
1.2 shall constitute the closing (the "Closing").  The date on which the Closing
takes place is referred to herein as the "Closing Date".  The Closing shall take
place at the offices of Klett Lieber Rooney & Schorling, a Professional
Corporation, One Oxford Centre, Pittsburgh, Pennsylvania 15219, on or before May
31, 1997, or at such other place and time or on such other date as the Purchaser
and the Company may agree.

     1.4  Termination of Agreement.  In the event that the Closing of the
          ------------------------                                       
transactions contemplated hereby are not consummated on or before May 31, 1997
for any reason whatsoever, including without limitation, the fulfillment of the
condition set forth in Section 5.12 (unless this Agreement is extended by the
mutual written agreement of the Company and the Purchaser), this Agreement shall
automatically and without further action on the part of any party hereto, be
deemed terminated and neither the Company or BPC nor the Purchaser shall have
any further liability or obligation whatsoever under this Agreement or otherwise
in connection with the transactions contemplated hereby.


     II.  Representations and Warranties of the Company and BPC.
          ----------------------------------------------------- 

     Subject to and except as disclosed by the Company or BPC on Schedule I, the
                                                                 ----------     
Company and BPC hereby represent and warrant to the Purchaser as follows:

     2.1  Organization and Good Standing.  Each of the Company and BPC is a
          ------------------------------                                   
corporation validly existing and in good standing under the laws of the State of
Delaware.  Each of the Company and BPC has all requisite corporate power and
authority and holds all material licenses, permits and other required
authorizations from governmental authorities necessary to own its respective
properties and assets and to conduct its respective businesses as presently
conducted, except where the failure to have any licenses, permits or
authorizations does not have a material adverse effect upon the

                                       2
<PAGE>
 
operations or financial conditions of the Company and BPC.  Each of the Company
and BPC is duly qualified to do business as a foreign corporation and is in good
standing in each jurisdiction in which the failure to so qualify would have a
material adverse effect on the operations or financial condition of the Company
or BPC, as the case may be.  True and complete copies of the Company's and BPC's
Certificates of Incorporation, and bylaws, as presently in effect, have been
delivered to counsel for the Purchaser.

     2.2  Capitalization.
          -------------- 

     (a) At the date hereof, the Company's authorized capital stock consists of
1,000,000 shares of preferred stock, $.01 par value per share, of which no
shares are issued and outstanding, and 15,000,000 shares of Common Stock, $.01
par value per share, of which 7,908,075 shares are issued and outstanding.  All
of the issued and outstanding shares of Common Stock have been duly authorized
and validly issued and are fully paid and nonassessable and were issued in
compliance with all applicable state and federal laws concerning the issuance of
securities.

     (b) At the date hereof, BPC's authorized capital stock consists of
1,000,000 shares of preferred stock, $.01 par value per share ("BPC Preferred
Stock"), of which 1,000,000 shares are issued and outstanding and owned by the
Company, and 5,000,000 shares of common stock, $.01 par value per share ("BPC
Common Stock"), of which 1,000,000 shares are reserved for issuance upon
conversion of the BPC Preferred Stock and 500,000 shares are reserved for
issuance upon exercise of the Warrant.  All of the issued and outstanding shares
of BPC Preferred Stock have been duly authorized and validly issued and are
fully paid and nonassessable and were issued in compliance with all applicable
state and federal laws concerning the issuance of securities.  As of the date
hereof, BPC is a wholly-owned subsidiary of the Company.

     (c) The shares of Common Stock which are being issued and sold hereunder
have been duly and validly authorized and, when issued, sold and delivered in
accordance with the terms hereof for the consideration provided for herein, will
be validly issued, fully paid and nonassessable and will not be subject to any
lien, encumbrance or restriction in favor of the Company except for restrictions
upon transfer imposed by this Agreement or federal and

                                       3
<PAGE>
 
state securities laws.  The shares of BPC Common Stock issuable upon exercise of
the Warrant have been duly and validly authorized and, upon exercise of the
Warrant and payment of the exercise price, will be validly issued, fully paid
and nonassessable and will not be subject to any lien, encumbrance or
restriction in favor of BPC except for restrictions upon transfer imposed by
federal and state securities laws.  No further approval or authorization of the
stockholders or the directors of the Company or BPC is required for the issuance
and sale of the Common Stock as contemplated herein, the issuance of the Warrant
or the issuance of shares of BPC Common Stock upon exercise of the Warrant.  BPC
shall, at all times during the term of the Warrant, reserve and keep available
out of its authorized but unissued shares of BPC Common Stock, solely for the
purpose of effecting the exercise of the Warrant, such number of shares of BPC
Common Stock as shall from time to time be sufficient to effect the exercise of
the Warrant.

     (d) Except for (i) the Common Stock to be issued pursuant to this
Agreement, (ii) the shares of BPC Common Stock reserved for issuance upon
exercise of the Warrant, (iii) shares of Common Stock reserved for issuance to
employees, directors or consultants of or to the Company upon exercise of
options granted pursuant to the Company's stock option plans in effect on the
Closing Date (the "SOPs"), (iv) 3,000,000 shares of BPC Common Stock to be
issued to the Company, and (v) except as otherwise provided in this Agreement,
including Schedule I and the Exhibits hereto, (A) no subscription, warrant,
          ----------                                                       
option, convertible security or other right (contingent or otherwise) to
purchase or acquire any securities of the Company or BPC is authorized or
outstanding, (B) neither the Company nor BPC has any obligation (contingent or
otherwise) to purchase, redeem or otherwise acquire any of its respective
securities or to pay any dividends or make any other distributions in respect
thereof, (C) no person or entity is entitled to any preemptive or similar right
with respect to the issuance of any securities of the Company or BPC, and (D) no
person or entity has any rights to require the registration of any securities of
the Company or BPC under the Securities Act of 1933, as amended (the "Securities
Act").

     (e) Except for BPC, K&D MagMotor Corp. and SatCon Film Microelectronics,
Inc., the Company has no subsidiaries and

                                       4
<PAGE>
 
does not own or control, directly or indirectly, any other corporation,
association or business entity.

     2.3  Authorization, Validity and Enforceability.  Each of the Company and
          ------------------------------------------                          
BPC has all requisite corporate power and authority to enter into this Agreement
and to carry out the transactions contemplated hereby.  The execution, delivery
and performance by the Company and BPC of this Agreement and the consummation of
the transactions contemplated hereby have been duly authorized by all necessary
corporate action.  The execution and delivery of this Agreement, including the
Exhibits hereto, the issuance of the Common Stock by the Company, the issuance
of the Warrant by BPC and the issuance of the shares of BPC Common Stock upon
exercise of the Warrant, will not violate any material provision of law
applicable to the Company or BPC and will not conflict with, or result in a
breach of any of the terms of, or constitute a default under, the Company's or
BPC's respective Certificate of Incorporation, bylaws or any material agreement,
instrument or other restriction to which the Company or BPC, as the case may be,
is a party or by which the Company, BPC or any of their respective properties or
assets is bound, except, in each case, for such violations, conflicts, breaches
or defaults that do not have a material adverse effect upon the Company's or
BPC's operations or financial conditions.  This Agreement and the Exhibits
hereto, when executed, will constitute the legal, valid and binding obligations
of the Company and BPC, enforceable against the Company and BPC in accordance
with their respective terms, except as enforceability may be limited by
applicable bankruptcy, insolvency, reorganization, moratorium or similar laws
and subject to general principles of equity (regardless of whether such
enforceability is considered in a proceeding in equity or at law).

     2.4  Government Consents, Etc.  Except as disclosed on Schedule I, no
          ------------------------                          ----------    
consent, approval or authorization of, or declaration, registration or filing
with, any person, entity or governmental authority on the part of the Company or
BPC is required on or prior to the Closing Date for the valid execution,
delivery and performance of this Agreement, including the Exhibits hereto, or
the valid consummation of the transactions contemplated hereby, except for
filings and registrations pursuant to federal and state securities laws, and
filings with the National

                                       5
<PAGE>
 
Association of Securities Dealers, Inc., if any, which filings and registrations
have been or will be made in a timely manner.

     2.5  Securities Laws.  Subject to the accuracy of the Purchaser's
          ---------------                                             
representations and warranties set forth in Article III hereof, the offer, sale
and issuance of the Common Stock and the Warrant, as provided in this Agreement,
is and is intended to be: (i) exempt from the registration requirements of the
Securities Act pursuant to Section 4(2) thereof or Regulation D promulgated
thereunder, and (ii) exempt from the registration or qualification requirements
of applicable state securities laws.

     2.6  No Defaults in Agreements.  Except as disclosed on Schedule I, neither
          -------------------------                          ----------         
the Company nor BPC is in violation of its Certificate of Incorporation or its
bylaws, nor is the Company or BPC in default in the performance or observance of
any obligation, agreement, covenant or condition contained in any material
contract, indenture, mortgage, loan agreement, lease, note, or other instrument
to which it is a party or by which it may be bound, the effect of which, upon
default or upon the passage of time, would have a material adverse effect on the
operations or financial conditions of the Company or BPC, as the case may be.

     2.7  Material Transactions.  Except as disclosed on Schedule I, neither the
          ---------------------                          ----------             
Company nor BPC has during the past 12 months (i) borrowed any funds or incurred
or become subject to any material obligations or liabilities (absolute or
contingent), except as incurred in the ordinary course of business, (ii)
discharged or satisfied any material lien or encumbrance or paid any obligation
or liability (absolute or contingent) other than current liabilities in the
ordinary course of business and obligations incurred in the ordinary course of
business referred to in clause (i) above, (iii) entered into any agreements or
arrangements granting any rights to purchase all or substantially all of the
assets of the Company or BPC, or providing for the merger or consolidation of
the Company or BPC into or with another corporation, or sold any substantial
product line, or (iv) suffered any material losses, or cancelled any debts or
claims outside of the ordinary course of business.

     2.8  Litigation.  Except as disclosed on Schedule I, there is no action or
          ----------                          ----------                       
proceeding at law or in equity pending

                                       6
<PAGE>
 
against the Company or BPC or any of their respective properties before any
court or governmental commission, foreign or domestic; and, except as disclosed
on Schedule I, there is no such proceeding pending in arbitration or before any
   ----------                                                                  
administrative agency.  Except as disclosed on Schedule I, there is no judgment,
                                               ----------                       
consent decree, injunction, rule or other judicial or administrative order
outstanding against the Company or BPC.

     2.9  Compliance.  To the best of the Company's and BPC's knowledge, each of
          ----------                                                            
the Company and BPC has complied in all material respects with all laws,
regulations and orders, foreign or domestic, applicable to its respective
business, and the uses by the Company and BPC of its respective properties, and
the conduct by the Company and BPC of its respective business does not in any
material respect violate any laws, regulations or orders, except for such
violations and non-compliance that the Company does not reasonably expect to
have a materially adverse affect on its financial condition.

     2.10  Intellectual Properties.  Set forth on Schedule I is a true and
           -----------------------                ----------              
complete list of all material patents, trademarks, service marks, trade names,
copyrights, licenses and proprietary rights owned, licensed or used by the
Company and BPC.  Each of the Company and BPC owns or possesses, or can obtain
by payment of royalties in amounts which, in the aggregate, do not adversely
affect the business and the prospects of the Company and BPC, all of the
patents, trademarks, service marks, trade names, copyrights, proprietary rights,
trade secrets, and licenses or rights to the foregoing, necessary for the
conduct of the business of the Company and BPC as currently conducted.  To the
best of the Company's and BPC's knowledge, the business of each of the Company
and BPC does not cause the Company or BPC to infringe or violate any of the
patents, trademarks, service marks, trade names, copyrights, licenses or
proprietary rights of any person or entity.

     2.11  Environmental.  The Company and BPC, the operation of their
           -------------                                              
respective businesses, and all real property that the Company and BPC own, lease
or otherwise occupy or use (the "Premises") are in material compliance with all
applicable Environmental Laws (as hereinafter defined) and orders or directives
of any governmental authorities having jurisdiction under such Environmental
Laws, except for such non-compliance that

                                       7
<PAGE>
 
the Company does not reasonably expect to have a material adverse effect upon
its operations or financial condition.  Neither the Company nor BPC has received
any citation, directive, letter or other communication, whether written or oral,
or any notice of any proceeding, claim or lawsuit, from any person arising out
of the ownership or occupation of the Premises, or the conduct of its respective
operations, and neither the Company nor BPC is aware of any basis therefor.  For
the purposes of this Agreement, the term "Environmental Laws" shall mean any
federal, state or local law or ordinance or regulation pertaining to the
protection of human health or the environment, including without limitation, the
Comprehensive Environmental Response Compensation and Liability Act, the
Emergency Planning and Community Right-to-Know Act and the Resource Conservation
and Recovery Act.

     2.12  Disclosure.  The Company has provided the Purchaser with copies of
           ----------                                                        
its Annual Report on Form 10-K for the fiscal year ended September 30, 1996, its
Quarterly Report on Form 10-Q for the fiscal quarter ended December 31, 1996 and
March 31, 1997, its proxy statement for the Company's 1997 annual meeting of
stockholders and any Form 8-K filed with the Securities and Exchange Commission
(the "Commission") since September 30, 1996 (collectively, the "Disclosure
Documents").  The Disclosure Documents, as of their respective dates, did not
contain an untrue statement of a material fact or omit to state a material fact
required to be stated therein or necessary to make the statement therein, in
light of the circumstances under which it was made, not misleading.  Since the
filing of the most recent Disclosure Document with the Commission, no event or
development has occurred which requires the Company to amend or supplement any
Disclosure Document or to file a current report on Form 8-K.  The audited and
unaudited financial statements included in the Disclosure Documents have been
prepared in accordance with generally accepted accounting principles applied on
a consistent basis.

     2.13  Survival of Representations and Warranties.  The representations and
           ------------------------------------------                          
warranties of the Company and BPC contained herein shall survive the execution
and delivery of this Agreement and the issuance of the Common Stock and the
Warrant, but shall terminate on the one year anniversary of the Closing Date.

                                       8
<PAGE>
 
     III.  Representations and Warranties of the Purchaser.
           ----------------------------------------------- 

     The Purchaser hereby represents and warrants to the Company and BPC as
follows:

     3.1  Organization; Good Standing.  The Purchaser is duly organized, validly
          ---------------------------                                           
existing and in good standing under the laws of the Commonwealth of
Pennsylvania, and has all requisite power and authority to carry on its business
as now conducted.

     3.2  Authorization; Validity and Enforceability.  All action, corporate or
          ------------------------------------------                           
otherwise, on the part of the Purchaser  necessary for the authorization,
execution and delivery of this Agreement and the performance of all obligations
of the Purchaser hereunder, has been taken or will be taken prior to the Closing
Date.  The execution, delivery and performance by the Purchaser of this
Agreement and the consummation of the transactions contemplated hereby have been
duly authorized and approved by all necessary corporate action, and this
Agreement and the Exhibits hereto, when executed, constitute valid and legally
binding obligations of the Purchaser, enforceable in accordance with their
respective terms, except as enforceability may be limited by applicable
bankruptcy, insolvency, reorganization, moratorium or similar laws and subject
to general principles of equity (regardless of whether such enforceability is
considered in a proceeding in equity or at law).  The execution and delivery of
this Agreement, including the Exhibits hereto, will not violate any material
provision of law and will not conflict with, or result in a breach of any of the
terms of, or constitute a default under, the charter, bylaws or other
organizational documents of the Purchaser, or any material agreement, instrument
or other restriction to which the Purchaser is a party or by which the Purchaser
is bound.

     3.3  Purchase for Investment.  The Purchaser represents that it is
          -----------------------                                      
purchasing and acquiring the Common Stock and the Warrant for its own account
for investment and not with a view to the resale or distribution, in whole or in
part, in violation of the Securities Act or applicable state securities law.

     3.4  Access to Information.  The Purchaser has had access during the course
          ---------------------                                                 
of this transaction and prior to the acquisition of the Common Stock and the
Warrant, to such information relating

                                       9
<PAGE>
 
to the Company and BPC as it has desired, and has been given the opportunity to
ask questions of, and receive answers from, the Company and BPC and their
respective representatives concerning the Company and BPC and the terms and
conditions of the issuance of the Common Stock and the Warrant, and to obtain
any additional information which the Company and BPC possess or can reasonably
obtain which is necessary to verify the accuracy of the information furnished to
the Purchaser.

     3.5  Restrictions on Transfer.  The Purchaser understands that (i) the
          ------------------------                                         
Common Stock, the Warrant and the BPC Common Stock issuable upon exercise of the
Warrant (collectively, the "Securities"), have not been registered under the
Securities Act by reason of their issuance in a transaction exempt from the
registration requirements of the Securities Act pursuant to Section 4(2) thereof
or Regulation D promulgated under the Securities Act, (ii) the Securities must
be held indefinitely unless a subsequent disposition thereof is registered under
the Securities Act or is exempt from such registration, (iii) certificates
evidencing the Securities will bear a legend to such effect and to the effect
that the Securities are subject to this Agreement, and (iv) the Company and BPC
will make a notation on their respective transfer books to such effect.

     3.6  Accredited Investor.  The Purchaser represents and warrants that it is
          -------------------                                                   
an "accredited investor" within the definition set forth in Rule 501(a) of
Regulation D promulgated under the Securities Act.  The Purchaser represents and
warrants that it has a sufficient net worth to bear the loss of the entire
investment should such loss occur.

     3.7  Survival.  The representations and warranties of the Purchaser
          --------                                                      
contained herein shall survive the execution and delivery of this Agreement and
the acquisition of the Common Stock and the Warrant, but shall terminate on the
one year anniversary of the Closing Date.


     IV.  Covenants and Agreements of the Company and BPC.
          ----------------------------------------------- 

     4.1  Access to Information and Staff.  The Purchaser and any authorized
          -------------------------------                                   
representatives thereof shall have access to

                                       10
<PAGE>
 
information regarding BPC, its products and the marketplace for such products,
including without limitation, access to visit the properties of BPC, and to
discuss its business with its employees, management and staff; provided,
however, that at BPC's request as a condition to such access, the Purchaser and
its authorized representatives shall execute a non-disclosure and non-use
agreement in form and substance agreed upon by the Purchaser and BPC; and
provided further that the Purchaser shall not be entitled to such access at any
time that BPC is registered under the Securities Exchange Act of 1934.

     4.2  Restrictions On Equity Sales.  So long as the Purchaser is the owner
          ----------------------------                                        
of at least (i) 50% of the shares of Common Stock acquired pursuant to this
Agreement, or (ii) 50% of the total number of shares of BPC Common Stock that
may be acquired pursuant to the Warrant, prior to the five year anniversary of
the Closing Date, BPC shall not issue or sell any equity securities of BPC in
any private securities transaction to any domestic entity or any of its parent,
subsidiaries or affiliates, which derived during its most recently completed
fiscal year revenues of $10,000,000 or more from the distribution of electricity
or natural gas, without the prior written consent of the Purchaser.

     4.3  Use of Proceeds.  The entire $5,000,000 purchase price delivered by
          ---------------                                                    
the Purchaser to the Company pursuant to Article I hereof shall be used solely
for the acquisition by the Company of 3,000,000 shares of BPC Common Stock.
BPC  covenants and agrees that all of the purchase price paid by the Company for
the aforestated shares shall be used for the purpose of developing and
conducting BPC's business, which shall include the development, manufacture and
marketing of flywheel energy storage systems for use in energy storage
applications.  Except as provided on Schedule 4.3, BPC further covenants and
                                     ------------                           
agrees that no part of the aforestated purchase price shall be used to repay the
Company for any funds expended by the Company on behalf of BPC prior to the
Closing without the prior written consent of the Purchaser.  The Purchaser
acknowledges and agrees that Schedule 4.3 shall include, without limitation, the
                             ------------                                       
reasonable expenses incurred by the Company from May 1, 1997 to May 31, 1997 in
connection with activities undertaken by the Company for or on behalf of BPC,
excluding any expenses related to the consummation of the transactions
contemplated by this Agreement.  The Company and BPC also covenant

                                       11
<PAGE>
 
and agree that no portion of the purchase price paid by the Purchaser shall be
used to pay broker's fees or commissions or similar payments of any kind
whatsoever.

     4.4  Protective Provisions.  The Company and BPC covenant and agree that so
          ---------------------                                                 
long as the Purchaser is the owner of at least 50% of the shares of the
Company's Common Stock acquired pursuant to this Agreement, neither the Company
nor BPC shall, without the prior written consent of the Purchaser:

     (a) Make any material change in the principal business activity of BPC as
currently contemplated to be conducted; or

     (b) Enter into any license, arrangement or agreement pursuant to which the
Company grants rights in or to intellectual property of the Company or BPC
relating to flywheel technology to a competitor of BPC.

     The provisions of this Section 4.4 shall terminate effective upon the
closing of BPC's initial public offering pursuant to a registration statement
under the Securities Act of 1933, as amended.

     4.5  Company Board of Directors.
          -------------------------- 

     (a) The Company covenants and agrees that immediately following the
Closing, the Company shall propose to the nominating committee of its Board of
Directors the nomination and appointment to the Company's Board of Directors of
one of the two nominees designated by the Purchaser (the "Purchaser
Representative").  Thereafter, so long as the Purchaser is the owner of at least
5% of the Company's issued and outstanding Common Stock, the Company covenants
and agrees that it shall, at each meeting of the stockholders of the Company at
which the Purchaser Representative's term of office as a director expires (or in
the event that a Purchaser Representative vacates such office at any time for
any reason whatsoever), (i) recommend that the Company's stockholders vote for
the Purchaser Representative, and (ii) cause to be voted for the Purchaser
Representative the shares of Common Stock for which the Company's management or
Board of Directors holds proxies or are otherwise entitled to vote.

                                       12
<PAGE>
 
     (b) The Purchaser covenants and agrees to provide the Company with the
names of two nominees from which the Company shall select the Purchaser
Representative.

     (c) The Company and the Purchaser covenant and agree that the initial
Purchaser Representative shall be Anthony J. Villiotti.


     4.6  BPC Board of Directors.
          ---------------------- 

     (a) The Company, BPC and the Purchaser covenant and agree that the Board of
Directors of BPC shall consist of 7 members.  The Company and the Purchaser
hereby agree to vote for, and BPC agrees to recommend that BPC's stockholders
vote for, and cause the shares of BPC Common Stock for which BPC's management or
Board of Directors holds proxies or are otherwise entitled to vote to be voted
for, the following candidates to the Board of Directors:

               (i)  So long as the Purchaser is the owner of at least (i) 50% 
of the shares of the Company's Common Stock acquired pursuant to this Agreement,
or (ii) 50% of the total number of shares of BPC Common Stock that may be
acquired pursuant to the Warrant, one director designated by the Purchaser (the
"BPC Purchaser Representative");

               (ii)  Four directors designated by the Company;

               (iii) One director who shall be an executive officer
of BPC; and

               (iv)  One independent outside director mutually selected upon by
a majority of the other directors.

          (b) If any of the directors designated pursuant to Section 4.6(a)
hereof is removed or vacates such position for any reason whatsoever, such
vacancy shall be filled as soon as practicable with a new designee satisfying
the requirements of Section 4.6(a).

                                       13
<PAGE>
 
          (c) The Company, BPC and the Purchaser covenant and agree that
immediately following the Closing, an Executive Committee of the BPC Board of
Directors shall be established, which shall be comprised of one director
designated by the Company, the BPC Purchaser Representative and a director who
is an executive officer of BPC.  The purpose of the Executive Committee shall be
to exercise Board authority between meetings of the Board of Directors, to
handle routine matters and to operate in emergency situations.

          4.7  Strategic Relationships.  The Company covenants and agrees that
               -----------------------                                        
for a period of 5 years following the Closing Date, if the Company seeks to
enter into a strategic relationship with a third party with respect to the
development of technology for the stationary terrestrial energy industry, the
Company shall, in good faith, first pursue discussions with the Purchaser with
respect to entering into such a relationship.  The foregoing shall in no way
obligate the Company to enter into an agreement with the Purchaser with respect
to the development of such technology or to continue such discussion for a
period of more than 30 business days.  Once the Company or the Purchaser shall
have discontinued such negotiations, the Company shall have no obligation to
develop such technology with or sell such technology to the Purchaser, whether
the terms of any transaction that the Company enters into with a third party are
more or less favorable than the terms discussed with the Purchaser.

          4.8  Development Contracts.  The Company covenants and agrees that it
               ---------------------                                           
shall offer to BPC to be retained as a contractor for any development contracts
existing on the date hereof held by the Company which are related to terrestrial
applications of flywheel technology, upon terms and conditions which are
mutually agreed upon by the Company and BPC, acting in good faith.  The Company
further covenants and agrees that it shall not, at any time and from time to
time, compete with BPC, directly or indirectly, for new development contracts
which are related specifically to stationary terrestrial applications of
flywheel technology.

          4.9  Strategic Product Development.  BPC covenants and agrees that for
               -----------------------------                                    
the period of 6 months following the Closing, BPC shall cooperate and work with
the Purchaser to develop a business plan for the development of new products of
strategic importance to

                                       14
<PAGE>
 
the Purchaser.  The aforestated business plan shall be promptly reviewed and
evaluated by BPC's Board of Directors upon its completion.

          4.10 U.S. Marine Corps Development Agreement.  The Company covenants
               ---------------------------------------                        
and agrees that from and after the Closing Date, any revenues that are received,
and any expenses that have been or are incurred (other than expenses which have
been offset by revenues received), by the Company pursuant to that certain
Agreement between the Company and the U.S. Marine Corps shall be paid and
delivered by the Company to BPC within 5 days after receipt thereof.

          4.11 Letter Agreement.  The Purchaser and BPC agree to enter into the
               ----------------                                                
Letter Agreement attached hereto as Exhibit E.  The Purchaser acknowledges that
                                    ---------                                  
the Company and BPC are entering into this Letter Agreement on the basis of the
Purchaser's intent to actively market and distribute BPC's products.

          4.12 Remedies.  Each of the Company, BPC and the Purchaser acknowledge
               --------                                                         
and agree that the parties to this Agreement would be irreparably damaged in the
event that any of the provisions of this Article IV were not performed in
accordance with their specific terms or were otherwise breached.  Accordingly,
it is agreed that each party to this Agreement shall be entitled to an
injunction to prevent breaches of this Article IV and to specifically enforce
any section of this Article IV in any action instituted in any court of the
United States or any state thereof having jurisdiction, in addition to any other
remedy to which such party may be entitled at law or in equity.

          4.13 Survival of Covenants and Agreements of the Company.  Except as
               ---------------------------------------------------            
otherwise set forth herein, the covenants and agreements of the Company set
forth in Article IV are continuing covenants and agreements and shall survive
the Closing Date.


V.   Conditions to the Purchaser's Obligations at Closing.
     ---------------------------------------------------- 

          The obligations of the Purchaser under Article I of this Agreement are
subject to the fulfillment, or the waiver by the

                                       15
<PAGE>
 
Purchaser, of the following conditions on or before the Closing Date:

          5.1  Representations and Warranties; Conditions.  The representations
               ------------------------------------------                      
and warranties set forth in Article II hereof shall be true and correct in all
material respects on and as of the date hereof and as of the Closing Date and
the Company and BPC shall have complied in all material respects with all
agreements and satisfied all material conditions on their part to be performed
or satisfied prior to the Closing Date.

          5.2  No Adverse Change.  Since the date of the latest financial
               -----------------                                         
statements included in the Disclosure Documents, there shall have been no
material adverse change in the business, financial condition or results of
operations of the Company and no material litigation or other proceeding shall
have been commenced by any person, including, without limitation, any
governmental agency, relating to any of the proposed transactions.

          5.3  Legal Opinion.  The Purchaser shall have received an opinion from
               -------------                                                    
Hale and Dorr LLP, counsel to the Company and BPC, dated the Closing Date,
addressed to the Purchaser, and reasonably satisfactory in form and substance to
the Purchaser's counsel, in substantially the form attached hereto as Exhibit G.
                                                                      --------- 

          5.4  Registration Rights Agreement.  The Company, BPC and the
               -----------------------------                           
Purchaser shall have executed and delivered the Registration Rights Agreement in
substantially the form attached hereto as Exhibit B, which Registration Rights
                                          ---------                           
Agreement shall be in form and substance acceptable to the Purchaser.

          5.5  Consulting Agreement.  BPC and the Purchaser shall have executed
               --------------------                                            
and delivered the Consulting Agreement in substantially the form attached hereto
as Exhibit C, which Consulting Agreement shall be in form and substance
   ---------                                                           
acceptable to the Purchaser.

          5.6  Services Agreement.  The Company and BPC shall have executed and
               ------------------                                              
delivered the Services Agreement in substantially the form attached hereto as
                                                                             
Exhibit D, which Services Agreement shall be in form and substance acceptable to
- ---------                                                                       
the Purchaser.

                                       16
<PAGE>
 
          5.7  Organizational Documents of BPC.  The Certificate of
               -------------------------------                     
Incorporation, bylaws and other organizational documents of BPC shall be
complete and shall be in form and substance acceptable to the Purchaser.

          5.8  Letter Agreement.  BPC and the Purchaser shall have executed and
               ----------------                                                
delivered the Letter Agreement in substantially the form attached as Exhibit E,
                                                                     --------- 
which Letter Agreement shall be in form and substance acceptable to the
Purchaser.

          5.9  Employment Agreements.  BPC shall have (either directly or by
               ---------------------                                        
assignment to BPC by the Company) employment agreements with key management
personnel, the identity of which personnel, and the contractual terms and
conditions of which employment agreements, are acceptable to the Purchaser.

          5.10 License.  The Company and BPC shall have entered into the License
               -------                                                          
Agreement (the "License") in substantially the form attached hereto as Exhibit
                                                                       -------
F.

          5.11 Certificates and Documents.  The Company and BPC shall have
               --------------------------                                 
delivered to counsel to the Purchaser:

          (a) A certificate executed by the President of the Company, dated the
Closing Date, certifying that the conditions specified in Section 5.1 have been
satisfied;

          (b) A certificate executed by the President of BPC, dated the Closing
Date, certifying that the conditions specified in Section 5.1 have been
satisfied;

          (c) Certificates, as of the most recent practicable dates as to the
corporate good standing of the Company and BPC issued by the Secretary of State
of the State of Delaware, and any other state in which each of the Company and
BPC is required to be qualified to do business, confirming such good standing on
or immediately prior to the Closing Date.

          5.12 Approval of Board of Directors.  The Board of Directors of the
               ------------------------------                                
Purchaser shall have approved this Agreement and the consummation of the
transactions contemplated hereby, which approval may be granted or denied in the
sole and absolute

                                       17
<PAGE>
 
discretion of the Board of Directors of the Purchaser.  In the event that the
Board of Directors of the Purchaser shall not have approved this Agreement and
the transactions contemplated hereby on or before May 31, 1997, this Agreement
shall be automatically terminated as set forth in Section 1.4 hereof.


     VI.  Conditions to the Company's and BPC's Obligations at Closing.
          ------------------------------------------------------------ 

          The obligations of the Company and BPC under Article I of this
Agreement are subject to the fulfillment, or the waiver by the Company or BPC,
on or before the Closing Date, of each of the following:

          6.1  Agreements.  The Services Agreement, the Letter Agreement and the
               ----------                                                       
License in the forms attached hereto as Exhibits D, E and F shall have been
                                        -------------------                
executed and delivered to the Company by the other parties thereto.

          6.2  No Litigation.  No material litigation or other proceeding shall
               -------------                                                   
have been commenced by any person, including without limitation, any
governmental agency, relating to the proposed transaction.

          6.3  Representations and Warranties; Conditions.  The representations
               ------------------------------------------                      
and warranties of the Purchaser set forth in Article III hereof shall be true
and correct in all material respects on and as of the date hereof and as of the
Closing Date, and the Purchaser shall have performed and complied in all
material respects with all agreements and material conditions on its part to be
performed or complied with prior to the Closing.

          6.4  Deliveries.  The Purchaser shall have delivered to the Company
               ----------                                                    
the purchase price to be delivered by the Purchaser pursuant to Article I
hereof.

                                       18
<PAGE>
 
          6.5  Certificates.  The Purchaser shall have delivered to counsel to
               ------------                                                   
the Company a certificate executed by a duly authorized officer of the
Purchaser, dated the Closing Date, certifying that the conditions specified in
Section 6.3 have been satisfied.


    VII.  Miscellaneous.
          ------------- 

          7.1 Expenses.  Each party hereto shall bear its own costs and expenses
              --------                                                          
that it incurs with respect to the negotiation, execution, delivery and
performance of this Agreement and the transactions contemplated hereby;
provided, however, that in the event of a Closing under this Agreement, BPC
shall pay the legal and closing fees and expenses of the Purchaser in an amount
not to exceed $50,000 (which payment may be made out of the proceeds of the sale
of BPC Common Stock to the Company).

          7.2 Finder's Fees.
              ------------- 

          (a) The Company and BPC (i) represent and warrant that neither the
Company nor BPC has retained any finder, agent or broker in connection with the
transactions contemplated by this Agreement, and (ii) hereby agree to indemnify
and hold harmless the Purchaser of and from any liability for any commission or
compensation in the nature of a finder's fee to any broker or other person or
firm (and the costs and expenses of defending against such liability or asserted
liability) for which the Company or BPC or any of their respective employees or
representatives is responsible.

          (b) The Purchaser (i) represents and warrants that it has retained no
finder or broker in connection with the transactions contemplated by this
Agreement, and (ii) hereby agrees to indemnify and to hold harmless the Company
and BPC of and from any liability for any commission or compensation in the
nature of a finder's fee to any broker or other person or firm (and the costs
and expenses of defending against such liability or asserted liability) for
which the Purchaser or any of the Purchaser's employees or representatives is
responsible.

          7.3 Notices.  All notices, requests, consents and other communications
              -------                                                           
hereunder shall be in writing and shall be

                                       19
<PAGE>
 
personally delivered or delivered by overnight courier or mailed by first-class
registered or certified mail, postage prepaid, return receipt requested,


              (a)  If to the Purchaser, to:

                   Anthony J. Villiotti
                   Vice President
                   Duquesne Enterprises
                   One Northshore Center
                   Suite 100
                   12 Federal Street
                   Pittsburgh, PA  15212

                   with a copy to:

                   Jane E. Hepner, Esq.
                   Klett Lieber Rooney & Schorling
                   A Professional Corporation
                   40th Floor, One Oxford Centre
                   Pittsburgh, PA  15219-6498



          (b) If to the Company, to:

                   David B. Eisenhaure
                   President
                   SatCon Technology Corporation
                   161 First Street
                   Cambridge, MA  02142-1221

                   with a copy to:

                   Jeffrey N. Carp, Esq.
                   Hale and Dorr LLP
                   60 State Street
                   Boston, MA  02109

                                       20
<PAGE>
 
Any party may change his or its address by notifying the other parties in
accordance with the provisions set forth herein.

          7.4 Integration; Amendments and Waiver.  This Agreement, together with
              ----------------------------------                                
all Schedules and Exhibits hereto, embodies the entire agreement and
understanding between the parties hereto and supersedes all prior agreements and
understandings relating to the subject matter hereof.  Any term of this
Agreement may be amended and the observance of any term of this Agreement may be
waived (either generally or in a particular instance and either retroactively or
prospectively), with the written consent of the Company, BPC and the Purchaser.
No waivers of or exceptions to any term, condition or provision of this
Agreement, in any one or more instances, shall be deemed to be, or construed as,
a further or continuing waiver of any such term, condition or provision.

          7.5 Severability.  The invalidity or unenforceability of any provision
              ------------                                                      
of this Agreement shall not affect the validity or enforceability of any other
provisions of this Agreement.

          7.6 Governing Law.  This Agreement shall be construed and enforced in
              -------------                                                    
accordance with the laws of the Commonwealth of Massachusetts.

          7.7 Successors and Assigns.  Except as otherwise provided herein, the
              ----------------------                                           
terms and conditions of this Agreement shall be binding upon, and inure to the
benefit of, the respective representatives, successors and assigns of the
parties hereto.  This Agreement may not be assigned by either party without the
prior written consent of the other party hereto; provided, however, that this
Agreement may be assigned by the Purchaser to an affiliate of the Purchaser
without the prior written consent of the Company or BPC.

          7.8 Exhibits, Schedules, and Headings.  Each Exhibit and Schedule to
              ---------------------------------                               
this Agreement is made a part of this Agreement as though set forth in full
herein.  The headings in this Agreement are for convenience of reference only,
and shall not limit or otherwise affect the meaning hereof.

          7.9 Counterparts.  This Agreement may be executed in two or more
              ------------                                                
counterparts, each of which shall be deemed an original,

                                       21
<PAGE>
 
but all of which together shall constitute one and the same instrument.

          7.10 Publicity.  The Company, BPC and the Purchaser shall each obtain
               ---------                                                       
the other's consent before issuing any press release or otherwise making any
public announcement with respect to this Agreement and no party shall issue any
press release or make such public announcement prior to obtaining the other
parties' consent, unless such release or announcement is required pursuant to
applicable state or federal laws.

                                       22
<PAGE>
 
    IN WITNESS WHEREOF, the undersigned have executed this Agreement as of the
day and year written above.


                        SATCON TECHNOLOGY CORPORATION

                        By:    /s/ David B. Eisenhaure
                           -----------------------------------------

                        Title: President and Chief Executive Officer
                               --------------------------------------


                        BEACON POWER CORPORATION

                        By:    /s/ David B. Eisenhaure
                           -----------------------------------------

                        Title: President and Chief Executive Officer
                               --------------------------------------


                        DUQUESNE ENTERPRISES

                        By:    /s/ Anthony J. Villiotti
                           -----------------------------------------

                        Title: Vice President
                              --------------------------------------

                                       23
<PAGE>
 
                                   SCHEDULE I
                                   ----------

                              Disclosure Schedule
                              -------------------


1.  Pursuant to a non-qualified stock option granted by the Company outside of
its existing stock option plans, the Company issued the following shares of its
Common Stock to five current or former members of its former law firm on the
following dates, for an exercise price of $5.25.

<TABLE>
<CAPTION>
 
Date                  Shares
- ----                  ------
<S>                   <C>
 
September 24, 1994    13,405
 
March 31, 1995         1,005
 
October 18, 1996       2,010
 
February 27, 1997      8,375
 
February 27, 1997      2,005
</TABLE>

    The shares of capital stock issued in the above transactions were offered
and sold in reliance upon the exemption from registration under Section 4(2) of
the Securities Act of 1933, as amended or Regulation D promulgated thereunder,
relative to sales by an issuer not involving any public offering.

2.  On January 23, 1997, the Company acquired substantially all of the assets
and assumed certain of the liabilities of K&D MagMotor Corp ("K&D") pursuant to
the terms of an Asset Purchase Agreement, dated as of January 2, 1997, by and
among the Company, K&D and K&D's principal stockholder.  The aggregate
consideration paid by the Company for the acquired assets of K&D was
approximately $210,000 in cash and 30,000 shares of the Company's common stock,
par value $.01 per share (the "Common Stock").  A wholly-owned subsidiary also
assumed certain of K&D's liabilities incurred in the ordinary course of
business.

3.  On April 16, 1997, the Company acquired substantially all of the assets and
assumed certain of the liabilities of Film Microelectronics, Inc. ("FMI")
pursuant to the terms of an Amended and Restated Asset Purchase Agreement, dated
as of April 3, 1997, among SatCon Film Microelectronics, Inc., a wholly-owned
subsidiary of the Company, FMI and Albert R. Snider, FMI's principal stockholder
(the "Stockholder").  The aggregate consideration paid by the Company for the
acquired assets of FMI was (i) 420,000 shares of Common Stock, (ii) the
assumption of trade payables aggregating approximately $710,000, and (iii) the
assumption of

                                       24
<PAGE>
 
indebtedness in an amount not to exceed $1 million.  The Company also entered
into a non-competition agreement with the Stockholder requiring aggregate
payments of $500,000.

4.  In connection with the Company's initial public offering in November 1992,
the Company issued to the underwriter warrants to purchase up to (i) 150,000
shares of Common Stock at an exercise price of $8.25 per share and (ii) 150,000
shares of Common Stock at an exercise price of $11.55 per share.  At September
30, 1996, none of these warrants had been exercised.

                                       25
<PAGE>
 
                                   Exhibit B
                                   ---------


                         REGISTRATION RIGHTS AGREEMENT
                         -----------------------------


                                  May 28, 1997


Duquesne Enterprises
One Northshore Center
Suite 100
12 Federal Street
Pittsburgh, PA  15212

Gentlemen:

          This will confirm that in consideration of your agreement to enter
into that certain Securities Purchase Agreement dated as of May 28, 1997 (the
"Purchase Agreement") between SatCon Technology Corporation, a Delaware
corporation ("SatCon"), Beacon Power Corporation, a Delaware corporation ("BPC")
and you, and as an inducement to you to consummate the transactions contemplated
by the Purchase Agreement, the Company and BPC covenant and agree with you as
follows:

          1.  Certain Definitions.  As used in this Registration Rights
              -------------------                                      
Agreement ("Agreement"), the following terms shall have the following respective
meanings:

          "Commission" shall mean the Securities and Exchange Commission or any
           ----------                                                          
other federal agency at the time administering the Securities Act.

          "Exchange Act" shall mean the Securities Exchange Act of 1934, as
           ------------                                                    
amended, or any similar federal statute, and the rules and regulations of the
Commission thereunder, all as the same shall be in effect at the time.

          "Holder" shall mean Duquesne Enterprises, its successors and assigns.
           ------

          "Registrable Shares" shall mean: (i) with respect to BPC, the shares
           ------------------                                                 
of BPC Common Stock acquired by Duquesne Enterprises pursuant to the Purchase
Agreement and owned by the Holder, and
<PAGE>
 
(ii) with respect to SatCon, the shares of SatCon Common Stock owned by the
Holder until such point in time as shares of SatCon Common Stock may be sold by
the Holder pursuant to Rule 144 promulgated under the Securities Act.

           "Registrant" shall mean either SatCon or BPC, as the case may be.
            ----------                                  

           "SatCon Common Stock" shall mean SatCon's common stock, $.01 par 
            -------------------                     
value per share.

          "BPC Common Stock" shall mean shares of BPC's common stock which are
           ----------------                                                   
hereafter acquired by the Holder pursuant to the exercise of that certain
Warrant dated May 28, 1997 (the "Warrant").

          "Securities Act" shall mean the Securities Act of 1933, as amended, or
           --------------                                                       
any similar federal statute, and the rules and regulations of the Commission
thereunder, all as the same shall be in effect at the time.

      2.  SatCon Registration Rights.
          -------------------------- 

          (a) If SatCon shall receive at any time a written request from the
Holder of SatCon Registrable Shares (or, if there shall be more than one Holder
of SatCon Registrable Shares, a written request from the Holders of a majority
of the SatCon Registrable Shares) that SatCon file a registration statement
under the Securities Act covering the registration of at least 25% of the SatCon
Registrable Shares then outstanding, then within 30 days of the receipt thereof,
SatCon shall use its best efforts to file with the Commission a registration
statement on Form S-3 under the Securities Act with respect to all SatCon
Registrable Shares that the Holder requests to be registered and use its best
efforts to have such registration statement declared effective by the Commission
as soon as practicable thereafter; provided, however, that SatCon may postpone
the filing or effectiveness of a registration statement for one or more periods
of up to 90 days in the aggregate in the event that such filing or effectiveness
would require SatCon to disclose any non-public information or file any
financial statements that SatCon would not otherwise be required to file with
the Commission.

                                       2
<PAGE>
 
          (b) SatCon shall not be required to effect more than one 
registration pursuant to Section 2(a).

     3.  BPC Registration Rights.
         ----------------------- 

          (a) Whenever BPC proposes to file a registration statement (other than
by a registration on Form S-4 or Form S-8, but including BPC's initial public
offering), at any time and from time to time, it will, prior to such filing,
give written notice to the Holder of its intention to do so and, upon the
written request of the Holder given within 15 business days after BPC provides
such notice, BPC shall use its best efforts to cause the number of BPC
Registrable Shares specified in the Holder's request to be included in the
registration statement filed under the Securities Act; provided that BPC shall
have the right to postpone or withdraw any registration effected pursuant to
this Section 3 without obligation to the Holder.

          (b) In connection with any registration statement contemplated by
Section 3(a) which relates to an offering to or through an underwriter or
syndicate of underwriters, BPC shall not be required to include any BPC
Registrable Shares in such registration statement unless the Holder accepts the
terms of the underwriting as agreed upon between BPC and the underwriters
selected by it, and then only in such quantity as will not, in the opinion of
the underwriters, jeopardize the success of the offering by BPC.  If in the
opinion of the managing underwriter the registration of all, or part of, the BPC
Registrable Shares which the Holder has requested to be included would adversely
affect such public offering, then BPC shall be required to include in the
underwriting only that number of BPC Registrable Shares, if any, which the
managing underwriter believes may be sold without causing such adverse effect.
If the number of BPC Registrable Shares to be included in the underwriting in
accordance with the foregoing is less than the total number of shares which the
Holder has requested to be included, then the Holder and all other holders of
shares of BPC common stock who are entitled to include shares of common stock in
such registration shall participate in the underwriting pro rata based upon
their total ownership of shares of BPC common stock.

          (c) The Holder of BPC Registrable Shares proposing to distribute its
securities in an offering under this Section 3

                                       3
<PAGE>
 
involving an underwriting shall (together with BPC and other shareholders of
securities distributing their shares through such underwriting) enter into an
underwriting agreement in customary form with the underwriter or underwriters
selected for the underwriting.

          4.  Assignment of Registration Rights.  The rights granted in Sections
              ---------------------------------                                 
2 and 3 of this Agreement may be assigned by the Holder to a transferee,
provided that such transferee is an affiliate or partner of the Holder, and
further provided that SatCon or BPC, as the case may be, is, within a reasonable
time after such transfer, furnished with written notice of the name and address
of such transferee and the securities with respect to which such registration
rights have been assigned.

          5.  Registration Procedures.  If and whenever a Registrant is required
              -----------------------                                           
by the provisions of this Agreement to effect the registration of any of the
Registrable Shares of SatCon under the Securities Act, the Registrant shall:

          (a) file with the Commission a registration statement with respect to
such Registrable Shares and use its best efforts to cause that registration
statement to become and remain effective;

          (b) as soon as reasonably practicable prepare and file with the
Commission any amendments and supplements to the registration statement and the
prospectus included in the registration statement as may be necessary to keep
the registration statement effective until the earlier of (i) the period of time
required by the Commission, or (ii) 180 days from the effective date;

          (c) as soon as reasonably practicable furnish to the selling Holder
such reasonable numbers of copies of the prospectus, including a preliminary
prospectus, in conformity with the requirements of the Securities Act, and such
other documents as the selling Holder may reasonably request in order to
facilitate the public sale or other disposition of the Registrable Shares owned
by the selling Holder;

          (d) as soon as reasonably practicable use its best efforts to register
or qualify the Registrable Shares covered by

                                       4
<PAGE>
 
the registration statement under the securities or Blue Sky laws of such states
as the selling Holder shall reasonably request, and do any and all other acts
and things that may be necessary or desirable to enable the selling Holder to
consummate the public sale or other disposition in such states of the
Registrable Shares owned by the selling Holder; provided, however, that the
Registrant shall not be required in connection with this Section 5(d) to qualify
as a foreign corporation or execute a general consent to service of process in
any jurisdiction; and

          (e) use its best efforts to list or have admitted for trading the
Registrable Shares covered by such registration statement with any securities
exchange or listing agency (including Nasdaq) on which the common stock of the
Registrant is then listed.

          If the Registrant has delivered a preliminary or final prospectus to
the selling Holder and after having done so the prospectus is amended to comply
with the requirements of the Securities Act, the Registrant shall promptly
notify the selling Holder and, if requested, the selling Holder shall
immediately cease making offers of Registrable Shares and return all
prospectuses to the Registrant.  The Registrant shall promptly provide the
selling Holder with revised prospectuses and, following receipt of the revised
prospectuses, the selling Holder shall be free to resume making offers of the
Registrable Shares.

          6.  Allocation of Expenses.  The Registrant will pay all Registration
              ----------------------                                           
Expenses (as hereinafter defined) of all registrations under this Agreement.
For purposes of this Agreement, the term "Registration Expenses" shall mean all
expenses incurred by the Registrant in complying with this Agreement, including
without limitation, all registration and filing fees, exchange listing fees,
printing expenses, the fees and disbursements of counsel for the Registrant, the
fees and disbursements of the Registrant's accountants, state Blue Sky fees and
expenses, and the expense of any special audits incident to or required by any
such registration, but excluding underwriting discounts and selling commissions.

          7.  Indemnification.
              --------------- 

                                       5
<PAGE>
 
          (a) In the event of any registration of any of the Registrable Shares
under the Securities Act pursuant to this Agreement, the Registrant will
indemnify and hold harmless the seller of such Registrable Shares, each of its
directors, officers or partners and each other person, if any, who controls such
seller within the meaning of the Securities Act or the Exchange Act against any
losses, claims, damages or liabilities, joint or several, to which such seller
or controlling person may become subject under the Securities Act, the Exchange
Act, Blue Sky laws or otherwise, insofar as such losses, claims, damages or
liabilities (or actions in respect thereof) arise out of or are based upon any
untrue statement or alleged untrue statement of any material fact contained in
any registration statement under which such Registrable Shares were registered
under the Securities Act, any preliminary prospectus or final prospectus
contained in the registration statement, or any amendment or supplement to such
registration statement, or arise out of or are based upon the omission or
alleged omission to state a material fact required to be stated therein or
necessary to make the statements therein, in light of the circumstances in which
they were made, not misleading; and the Registrant will reimburse such seller
and each such controlling person for any legal or any other expenses reasonably
incurred by such seller or controlling person in accordance with this Section 7
in connection with investigating or defending any such loss, claim, damage,
liability or action; provided, however, that the Registrant will not be liable
in any such case to the extent that any such loss, claim, damage or liability
arises out of or is based upon any untrue statement or omission made in such
registration statement, preliminary prospectus or prospectus, or any such
amendment or supplement, in reliance upon and in conformity with information
furnished to the Registrant, in writing, by or on behalf of such seller or
controlling person specifically for use in the preparation thereof; and,
provided, further that the Registrant shall not be liable for any loss, claim,
damage, action or expenses that relates to an untrue statement or alleged untrue
statement of a material fact or an omission or alleged omission of a material
fact in any preliminary prospectus, prospectus, registration statement or
amendment thereto to the extent that the Registrant corrected such misstatement
or omission and provided the Holder with amended or supplemented prospectuses
prior to the time that the Holder completed the sale giving rise to the loss,
claim, damage, claim or action.

                                       6
<PAGE>
 
          (b) In the event of any registration of any of the Registrable Shares
under the Securities Act pursuant to this Agreement, each seller of Registrable
Shares, severally and not jointly, will indemnify and hold harmless the
Registrant, each of its directors and officers and each person, if any, who
controls the Registrant within the meaning of the Securities Act or the Exchange
Act, against any losses, claims, damages or liabilities, joint or several, to
which the Registrant, such directors and officers or controlling persons may
become subject under the Securities Act, Exchange Act, Blue Sky laws or
otherwise, insofar as such losses, claims, damages or liabilities (or actions in
respect thereof) arise out of or are based upon any untrue statement or alleged
untrue statement of a material fact contained in any registration statement
under which such Registrable Shares were registered under the Securities Act,
any preliminary prospectus or final prospectus contained in the registration
statement, or any amendment or supplement to the registration statement, or
arise out of or are based upon any omission or alleged omission to state a
material fact required to be stated therein or necessary to make the statements
therein, in light of the circumstances in which they were made, not misleading,
if the statement or omission was made in reliance upon and in conformity with
information furnished in writing to the Registrant by or on behalf of such
seller, specifically for use in connection with the preparation of such
registration statement, prospectus, amendment or supplement; provided, however,
that the obligations of the Holder hereunder shall be limited to an amount equal
to the proceeds to the Holder of Registrable Shares sold as contemplated herein.

          (c) Each party entitled to indemnification under this Section 7 (the
"Indemnified Party") shall give notice to the party required to provide
indemnification (the "Indemnifying Party") promptly after such Indemnified Party
has actual knowledge of any claim as to which indemnity may be sought, and shall
permit the Indemnifying Party to assume the defense of any such claim or any
litigation resulting therefrom; provided that counsel for the Indemnifying
Party, who shall conduct the defense of such claim or litigation, shall be
approved by the Indemnified Party (whose approval shall not be unreasonably
withheld); and, provided, further, that the failure of any Indemnified Party to
give notice as provided herein shall not relieve the Indemnifying Party of its

                                       7
<PAGE>
 
obligations under this Section 7.  The Indemnified Party may participate in such
defense at such party's expense; provided, however, that the Indemnifying Party
shall pay such expense if representation of such Indemnified Party by the
counsel retained by the Indemnifying Party would be inappropriate due to actual
or potential differing interests between the Indemnified Party and any other
party represented by such counsel in such proceeding.  No Indemnifying Party, in
the defense of any such claim or litigation shall, except with the consent of
each Indemnified Party, consent to entry of any judgment or enter into any
settlement which does not include as an unconditional term thereof the giving by
the claimant or plaintiff to such Indemnified Party of a release from all
liability in respect of such claim or litigation, and no Indemnified Party shall
consent to entry of any judgment or settle such claim or litigation without the
prior written consent of the Indemnifying Party.

          8.  Indemnification with Respect to Underwritten Offering.  In the
              -----------------------------------------------------         
event that Registrable Shares are sold pursuant to a registration statement in
an underwritten offering, the Registrant and the Holder agree to enter into an
underwriting agreement containing customary representations and warranties with
respect to the business and operations of an issuer of the securities being
registered and customary covenants and agreements to be performed by such issuer
and a selling stockholder, including without limitation customary provisions
with respect to indemnification by the Registrant and the Holder of the
underwriters of such offering and their controlling persons.

          9.  Information by Holder.  The Holder of Registrable Shares included
              ---------------------                                            
in any registration shall furnish to the Registrant such information regarding
the Holder and the distribution proposed by the Holder as the Registrant may
request in writing and as shall be required in connection with any registration,
qualification or compliance referred to in this Agreement.

          10.  "Stand-Off" Agreement.  The Holder, if requested by the
               ---------------------                                  
Registrant and an underwriter of securities of the Registrant, shall agree not
to sell or otherwise transfer or dispose of any Registrable Shares or other
securities of the Registrant held by the Holder for a specified period of time
(not to exceed 180 days) following the effective date of a registration
statement.  Such

                                       8
<PAGE>
 
agreement shall be in writing in a form reasonably satisfactory to the
Registrant, such underwriter and the Holder.  The Registrant may impose stop
transfer instructions with respect to the Registrable Shares or other securities
subject to the foregoing restriction until the end of the stand-off period.

          11.  Changes in Stock.  If, and as often as, there is any change in
               ----------------                                              
the SatCon Common Stock or the BPC Common Stock by way of a stock split, stock
dividend, combination or reclassification, or through a merger, consolidation,
reorganization or recapitalization, or by any other means, appropriate
adjustment shall be made in the provisions hereof so that the rights and
privileges granted hereby shall continue with respect to the SatCon Common Stock
or the BPC Common Stock as so changed.

          12.   Rule 144 Reporting.  With a view to making available the
                ------------------                                      
benefits of certain rules and regulations of the Commission which may at any
time permit the sale of the Registrable Shares to the public without
registration, SatCon shall at all times, and BPC shall at all times after 90
days after any registration statement covering a public offering of securities
of BPC under the Securities Act shall have become effective:

          (a) make and keep public information available, as those terms are
understood and defined in Rule 144 under the Securities Act;

          (b) use its best efforts to file with the Commission in a timely
manner all reports and other documents required of the Registrant under the
Securities Act and the Exchange Act; and

          (c) furnish to the Holder forthwith upon request a written statement
by the Registrant as to its compliance with the reporting requirements of Rule
144 and of the Securities Act and the Exchange Act, a copy of the most recent
annual or quarterly report of the Registrant and such other reports and
documents so filed by the Registrant as the Holder may reasonably request in
availing itself of any rule or regulation of the Commission allowing the Holder
to sell any Registrable Shares without registration.

                                       9
<PAGE>
 
          13.  Representations and Warranties of SatCon and BPC.  Each of SatCon
               ------------------------------------------------                 
and BPC represents and warrants to the Holder as follows:

          (a) The execution, delivery and performance of this Agreement by each
of SatCon and BPC has been duly authorized by all requisite corporate action and
will not violate any provision of law applicable to SatCon or BPC, any order
applicable to SatCon or BPC of any court or other agency of government, the
Certificate of Incorporation or bylaws of such company or violate, conflict with
or result in a breach of any provision of any indenture, agreement or other
instrument to which it or any or its properties or assets is bound, if such
violation, conflict or breach impairs the ability of SatCon or BPC to perform
its obligations and this Agreement.

          (b) This Agreement has been duly executed and delivered by each of
SatCon and BPC and constitutes the legal, valid and binding obligation of SatCon
and BPC, enforceable in accordance with its terms, subject to applicable
bankruptcy, moratorium and other laws generally affecting the rights and
remedies of creditors.

14.  Miscellaneous.
     ------------- 

          (a) All covenants and agreements contained in this Agreement by or on
behalf of any of the parties hereto shall bind and inure to the benefit of the
respective successors and assigns of the parties hereto (including, without
limitation, transferees of any Registrable Shares), whether so expressed or not.

          (b) All notices, requests, consents and other communications hereunder
shall be in writing and shall be mailed by certified or registered mail, return
receipt requested, postage prepaid, or telexed, in the case of non-U.S.
residents, addressed as follows to each party at the address of such party set
forth in the Purchase Agreement, with appropriate copies as noted therein.

          (c) This Agreement shall be governed by and construed in accordance 
with the laws of the State of Massachusetts.

          (d) This Agreement may not be amended or modified, and no provision
hereof may be waived, without the written consent of SatCon, BPC and the Holder.

                                       10
<PAGE>
 
          (e) This Agreement may be executed 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.

          (f) If any provision of this Agreement shall be held to be illegal,
invalid or unenforceable, such illegality, invalidity or unenforceability shall
attach only to such provision and shall not in any manner affect or render
illegal, invalid or unenforceable any other provision of this Agreement, and
this Agreement shall be carried out as if any such illegal, invalid or
unenforceable provision were not contained herein.

                                       11
<PAGE>
 
          Please indicate your acceptance of the foregoing by signing and
returning the enclosed counterpart of this Agreement, whereupon this
Registration Rights Agreement shall be a binding agreement between the Company
and you.


                                 Very truly yours,

                                 SatCon Technology Corporation

                                 By:     /s/ David B. Eisenhaure
                                     ---------------------------------------

                                 Title: President and Chief Executive Officer
                                       ---------------------------------------



                                 Beacon Power Corporation

                                 By:     /s/ David B. Eisenhaure
                                    ---------------------------------------

                                 Title: President and Chief Executive Officer
                                       ---------------------------------------



Accepted and agreed to,
with the intent to be legally bound,
this  28th  day of May, 1997.
     ------                  


Duquesne Enterprises

By:     /s/ Anthony J. Villiotti
   -------------------------------

Title:  Vice President
      ----------------------------

                                       12
<PAGE>
 
                                   Exhibit C
                                   ---------


          THIS WARRANT AND THE SHARES OF COMMON STOCK ISSUED UPON ITS
                  EXERCISE ARE SUBJECT TO THE RESTRICTIONS ON
                TRANSFER SET FORTH IN SECTION 4 OF THIS WARRANT
    -----------------------------------------------------------------------
                                        

Warrant No.  1                                        Number of Shares: 500,000
                                                         (subject to adjustment)
Date of Issuance:  May 28, 1997


                            BEACON POWER CORPORATION
                            ------------------------

                         Common Stock Purchase Warrant
                         -----------------------------


     Beacon Power Corporation, a Delaware corporation (the "Company"), for value
received, hereby certifies that Duquesne Enterprises, or its registered assigns
(the "Registered Holder"), is entitled, subject to the terms set forth below, to
purchase from the Company, at any time or from time to time on or after the date
of issuance and on or before the earlier of (i) May 28, 1999 and (ii) 30 days
prior to the filing of a registration statement under the Securities Act of 1933
with respect to the Company's Common Stock, par value $0.01 per share (the
"Common Stock"), (the "Termination Date") at not later than 5:00 p.m. (Boston,
Massachusetts time), 500,000 shares of Common Stock at a purchase price of $6.00
per share. The shares purchasable upon exercise of this Warrant, and the
purchase price per share, each as adjusted from time to time pursuant to the
provisions of this Warrant, are hereinafter referred to as the "Warrant Shares"
and the "Purchase Price," respectively.

     1.   Exercise.
          -------- 

          (a) This Warrant may be exercised by the Registered Holder, in whole
or in increments of 100,000 shares, by surrendering this Warrant, with the
purchase form appended hereto as Exhibit I duly executed by such Registered
                                 ---------                                 
Holder or by such Registered Holder's duly authorized attorney, at the principal
office of the Company, or at such other office or agency as the Company may
designate, accompanied by payment in full, in lawful money of the United States,
of the Purchase Price payable in respect of the number of Warrant Shares
purchased upon such exercise.

          (b) Each exercise of this Warrant shall be deemed to have been
effected immediately prior to the close of business on the day on which this
Warrant shall have been surrendered to the Company as provided in subsection
1(a) above.  At such time, the person or persons in whose name or names any
certificates for Warrant Shares shall be issuable upon

                                      -1-
<PAGE>
 
such exercise as provided in subsection 1(c) below shall be deemed to have
become the holder or holders of record of the Warrant Shares represented by such
certificates.

          (c) As soon as practicable after the exercise of this Warrant in full
or in part, and in any event within 10 days thereafter, the Company, at its
expense, will cause to be issued in the name of, and delivered to, the
Registered Holder, or as such Holder (upon payment by such Holder of any
applicable transfer taxes) may direct:

          (i) a certificate or certificates for the number of full Warrant
Shares to which such Registered Holder shall be entitled upon such exercise
plus, in lieu of any fractional share to which such Registered Holder would
otherwise be entitled, cash in an amount determined pursuant to Section 3
hereof; and

          (ii) in case such exercise is in part only, a new warrant or warrants
(dated the date hereof) of like tenor, calling in the aggregate on the face or
faces thereof for the number of Warrant Shares equal (without giving effect to
any adjustment therein) to the number of such shares called for on the face of
this Warrant minus the number of such shares purchased by the Registered Holder
upon such exercise.

       2. Adjustments.
          ----------- 

          (a) General.  The Purchase Price shall be subject to adjustment from 
              -------
time to time pursuant to the terms of this Section 2.

          (b) Recapitalizations.  If outstanding shares of the Company's Common
              -----------------                                                
Stock shall be subdivided into a greater number of shares or a dividend in
Common Stock shall be paid in respect of Common Stock, the Purchase Price in
effect immediately prior to such subdivision or at the record date of such
dividend shall simultaneously with the effectiveness of such subdivision or
immediately after the record date of such dividend be proportionately reduced.
If outstanding shares of Common Stock shall be combined into a smaller number of
shares, the Purchase Price in effect immediately prior to such combination
shall, simultaneously with the effectiveness of such combination, be
proportionately increased.

          (c) Mergers, etc.  If there shall occur any capital reorganization or
              ------------                                                     
reclassification of the Company's Common Stock (other than a change in par value
or a subdivision or combination as provided for in subsection 2(b) above), or
any consolidation or merger of the Company with or into another corporation, or
a transfer of all or substantially all of the assets of the Company, then, as
part of any such reorganization, reclassification, consolidation, merger or
sale, as the case may be, lawful provision shall be made so that the Registered
Holder of this Warrant shall have the right thereafter to receive upon the
exercise hereof the kind and amount of shares of stock or other securities or
property which such Registered Holder would have been entitled to receive if,
immediately prior to any such reorganization, reclassification, consolidation,
merger or sale, as the case may be, such Registered Holder had held the number
of shares of Common Stock which were then

                                      -2-
<PAGE>
 
purchasable upon the exercise of this Warrant. In any such case, appropriate
adjustment (as reasonably determined in good faith by the Board of Directors of
the Company) shall be made in the application of the provisions set forth herein
with respect to the rights and interests thereafter of the Registered Holder of
this Warrant, such that the provisions set forth in this Section 2 (including
provisions with respect to adjustment of the Purchase Price) shall thereafter be
applicable, as nearly as is reasonably practicable, in relation to any shares of
stock or other securities or property thereafter deliverable upon the exercise
of this Warrant.

          (d) Adjustment in Number of Warrant Shares.  When any adjustment is
              --------------------------------------                         
required to be made in the Purchase Price, the number of Warrant Shares
purchasable upon the exercise of this Warrant shall be changed to the number
determined by dividing (i) an amount equal to the number of shares issuable upon
the exercise of this Warrant immediately prior to such adjustment, multiplied by
the Purchase Price in effect immediately prior to such adjustment, by (ii) the
Purchase Price in effect immediately after such adjustment.

          (e) Certificate of Adjustment.  When any adjustment is required to be
              -------------------------                                        
made pursuant to this Section 2, the Company shall promptly mail to the
Registered Holder a certificate setting forth the Purchase Price after such
adjustment and setting forth a brief statement of the facts requiring such
adjustment.  Such certificate shall also set forth the kind and amount of stock
or other securities or property into which this Warrant shall be exercisable
following such adjustment.

     3.  Fractional Shares.  The Company shall not be required upon the exercise
         -----------------                                                      
of this Warrant to issue any fractional shares, but shall make an adjustment
therefor in cash on the basis of the Fair Market Value per share of Common
Stock, as determined pursuant to subsection 1(b) above.

     4.  Requirements for Transfer.
         ------------------------- 

          (a) This Warrant and the Warrant Shares shall not be sold or
transferred without the approval of the Company, which consent may be withheld
solely at the discretion of the Company for any reason or no reason (except that
such consent shall not be unreasonably withheld in the event of a transfer to an
affiliate of the Holder), and in no event shall be sold or transferred unless
either (i) they first shall have been registered under the Securities Act of
1933, as amended (the "Act"), or (ii) the Company first shall have been
furnished with an opinion of legal counsel, reasonably satisfactory to the
Company, to the effect that such sale or transfer is exempt from the
registration requirements of the Act.

          (b) Each certificate representing Warrant Shares shall bear a legend 
substantially in the following form:

               "The securities represented by this certificate have not been
               registered under the Securities Act of

                                      -3-
<PAGE>
 
               1933, as amended, and may not be offered, sold or otherwise
               transferred, pledged or hypothecated without the consent of the
               Company and unless and until such securities are registered under
               such Act or an opinion of counsel satisfactory to the Company is
               obtained to the effect that such registration is not required."

     5.   No Impairment.  The Company will not, by amendment of its charter or
          -------------                                                       
through reorganization, consolidation, merger, dissolution, sale of assets or
any other voluntary action, avoid or seek to avoid the observance or performance
of any of the terms of this Warrant, but will at all times in good faith assist
in the carrying out of all such terms and in the taking of all such action as
may be necessary or appropriate in order to protect the rights of the holder of
this Warrant against impairment.

     6.   Liquidating Dividends.  If the Company pays a dividend or makes a
          ---------------------                                            
distribution on the Common Stock payable otherwise than in cash out of earnings
or earned surplus (determined in accordance with generally accepted accounting
principles) except for a stock dividend payable in shares of Common Stock (a
"Liquidating Dividend"), then the Company will pay or distribute to the
Registered Holder of this Warrant, upon the exercise hereof, in addition to the
Warrant Shares purchased upon such exercise, the Liquidating Dividend which
would have been paid to such Registered Holder if he had been the owner of
record of such Warrant Shares immediately prior to the date on which a record is
taken for such Liquidating Dividend or, if no record is taken, the date as of
which the record holders of Common Stock entitled to such dividends or
distribution are to be determined.

     7.   Notices of Record Date, etc.  In case:
          ---------------------------           

          (a) the Company shall take a record of the holders of its Common Stock
(or other stock or securities at the time deliverable upon the exercise of this
Warrant) for the purpose of entitling or enabling them to receive any right to
subscribe for or purchase any shares of stock of any class or any other
securities, or to receive any other right; or

          (b) of any capital reorganization of the Company, any reclassification
of the capital stock of the Company, any consolidation or merger of the Company
with or into another corporation (other than a consolidation or merger in which
the Company is the surviving entity), or any transfer of all or substantially
all of the assets of the Company; or

          (c) of the voluntary or involuntary dissolution, liquidation or
winding-up of the Company,

then, and in each such case, the Company will mail or cause to be mailed to the
Registered Holder of this Warrant a notice specifying, as the case may be, (i)
the date on which a record

                                      -4-
<PAGE>
 
is to be taken for the purpose of such dividend, distribution or right, and
stating the amount and character of such distribution or right, or (ii) the
effective date on which such reorganization, reclassification, consolidation,
merger, transfer, dissolution, liquidation or winding-up is to take place, and
the time, if any is to be fixed, as of which the holders of record of Common
Stock (or such other stock or securities at the time deliverable upon the
exercise of this Warrant) shall be entitled to exchange their shares of Common
Stock (or such other stock or securities) for securities or other property
deliverable upon such reorganization, reclassification, consolidation, merger,
transfer, dissolution, liquidation or winding-up.  Such notice shall be mailed
at least ten (10) days prior to the record date or effective date for the event
specified in such notice.

     8.   Reservation of Stock.  The Company will at all times reserve and keep
          --------------------                                                 
available, solely for issuance and delivery upon the exercise of this Warrant,
such number of Warrant Shares and other stock, securities and property, as from
time to time shall be issuable upon the exercise of this Warrant.

     9.   Exchange of Warrants.  Upon the surrender by the Registered Holder of
          --------------------                                                 
any Warrant or Warrants, properly endorsed, to the Company at the principal
office of the Company, the Company will, subject to the provisions of Section 4
hereof, issue and deliver to or upon the order of such Holder, at the Company's
expense, a new Warrant or Warrants of like tenor, in the name of such Registered
Holder or as such Registered Holder (upon payment by such Registered Holder of
any applicable transfer taxes) may direct, calling in the aggregate on the face
or faces thereof for the number of shares of Common Stock called for on the face
or faces of the Warrant or Warrants so surrendered.

     10.  Replacement of Warrants.  Upon receipt of evidence reasonably
          -----------------------                                      
satisfactory to the Company of the loss, theft, destruction or mutilation of
this Warrant and (in the case of loss, theft or destruction) upon delivery of an
indemnity agreement (with surety if reasonably required) in an amount reasonably
satisfactory to the Company, or (in the case of mutilation) upon surrender and
cancellation of this Warrant, the Company will issue, in lieu thereof, a new
Warrant of like tenor.

     11.  Transfers, etc.
          -------------- 

          (a) The Company will maintain a register containing the names and
addresses of the Registered Holders of this Warrant.  Any Registered Holder may
change its or his address as shown on the warrant register by written notice to
the Company requesting such change.

          (b) Subject to the provisions of Section 4 hereof, this Warrant and
all rights hereunder are transferable, in whole or in part, upon surrender of
this Warrant with a properly executed assignment (in the form of Exhibit II
                                                                 ----------
hereto) at the principal office of the Company.

                                      -5-
<PAGE>
 
          (c) Until any transfer of this Warrant is made in the warrant
register, the Company may treat the Registered Holder of this Warrant as the
absolute owner hereof for all purposes; provided, however, that if and when this
                                        --------  -------                       
Warrant is properly assigned in blank, the Company may (but shall not be
obligated to) treat the bearer hereof as the absolute owner hereof for all
purposes, notwithstanding any notice to the contrary.

     12.  Additional Rights to Purchase Common Stock.  In addition to the rights
          -------------------------------------------                           
of the Holder to purchase 500,000 shares (subject to adjustment) of Common
Stock, Duquesne Enterprises shall be entitled to participate on the same terms
and conditions, including price, as the other participants, in any private
offering of equity securities of the Company to the extent, but only to the
extent, necessary to permit Duquesne Enterprises (together with the Holder of
this Warrant if, this Warrant is not then held by Duquesne Enterprises) to own
(assuming that this warrant is exercised in full) 20% of the voting securities
of the Company outstanding after such offering; provided, however, that Duquesne
Enterprises shall not be entitled to purchase more than 50% of the equity
securities issued in any such offering.  Duquesne Enterprises' right to
participate in such private offerings shall terminate (i) on the Termination
Date, if this Warrant has not been exercised in full or (ii) if this Warrant has
been exercised in full, upon the closing of the initial public offering of the
Company's Common Stock.

     13.  Mailing of Notices, etc.  All notices and other communications from
          -----------------------                                            
the Company to the Registered Holder of this Warrant shall be mailed by first-
class certified or registered mail, postage prepaid, to the address furnished to
the Company in writing by the last Registered Holder of this Warrant who shall
have furnished an address to the Company in writing.  All notices and other
communications from the Registered Holder of this Warrant or in connection
herewith to the Company shall be mailed by first-class certified or registered
mail, postage prepaid, to the Company at its principal office set forth below.
If the Company should at any time change the location of its principal office to
a place other than as set forth below, it shall give prompt written notice to
the Registered Holder of this Warrant and thereafter all references in this
Warrant to the location of its principal office at the particular time shall be
as so specified in such notice.

     14.  No Rights as Stockholder.  Until the exercise of this Warrant, the
          ------------------------                                          
Registered Holder of this Warrant shall not have or exercise any rights by
virtue hereof as a stockholder of the Company.

     15.  Change or Waiver.  Any term of this Warrant may be changed or waived
          ----------------                                                    
only by an instrument in writing signed by the party against which enforcement
of the change or waiver is sought.

     16.  Headings.  The headings in this Warrant are for purposes of reference
          --------                                                             
only and shall not limit or otherwise affect the meaning of any provision of
this Warrant.

                                      -6-
<PAGE>
 
     17.  Governing Law.  This Warrant will be governed by and construed in
          -------------                                                    
accordance with the laws of the Commonwealth of Massachusetts.


                              BEACON POWER CORPORATION



                              By:      /s/ David B. Eisenhaure
                                 ---------------------------------------------

                              Title:   President and Chief Executive Officer
                                    ------------------------------------------

ATTEST:


       /s/ Michael C. Turmelle
- --------------------------------------

                                      -7-
<PAGE>
 
                                                                       EXHIBIT I
                                                                       ---------


                                 PURCHASE FORM
                                 -------------


To:  Beacon Power Corporation
161 First Street
Cambridge, MA 02142-1221                        Dated:____________


     The undersigned, pursuant to the provisions set forth in the attached
Warrant (No. ___), hereby irrevocably elects to purchase _____ shares of the
Common Stock covered by such Warrant.  The undersigned herewith makes payment of
$____________, representing the full purchase price for such shares at the price
per share provided for in such Warrant.



                                        Signature:_____________________

                                        Address:_______________________

                                                _______________________
<PAGE>
 
                                                                      EXHIBIT II
                                                                      ----------


                                ASSIGNMENT FORM
                                ---------------


     FOR VALUE RECEIVED, ________________________________________ hereby sells,
assigns and transfers all of the rights of the undersigned under the attached
Warrant (No. ____) with respect to the number of shares of Common Stock covered
thereby set forth below, unto:

Name of Assignee               Address                            No. of Shares
- ----------------               -------                            -------------



Dated:_____________________    Signature:_______________________________

Dated:_____________________    Witness:_________________________________



phelan/104130.219/warrant1.wpf


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