UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM 8-K
                                 CURRENT REPORT
                     Pursuant to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934

          Date of report (Date of earliest event reported): May 6, 2005

                            BEACON POWER CORPORATION
               (Exact Name of Registrant as Specified in Charter)

            DELAWARE                     001-16171              04-3372365
(State or Other Jurisdiction of   (Commission File Number)    (IRS Employer
          Incorporation)                                    Identification No.)

            234 BALLARDVALE STREET
                WILMINGTON, MA                                   01887
    (Address of Principal Executive Offices)                   (Zip Code)

        Registrant's telephone number, including area code: 978-694-9121

Check the appropriate box below if the Form 8-K filing is intended to
simultaneously satisfy the filing obligation of the registrant under any of the
following provisions:

[  ] Written communications  pursuant to Rule 425 under the Securities Act (17
     CFR 230.425)

[  ]  Soliciting  material  pursuant to Rule 14a-12 under the Exchange Act (17
     CFR 240.14a-12)

[  ]  Pre-commencement  communications  pursuant  to Rule  14d-2(b)  under the
     Exchange Act (17 CFR 240.14d-2(b))

[  ]  Pre-commencement  communications  pursuant  to Rule  13e-4(c)  under the
     Exchange Act (17 CFR 240.13e-4(c))




                Section 1 - Registrant's Business and Operations


Item 1.01  Entry into a Material Definitive Agreement.

Item 5.02  Departure of Director and  Principal  Officer;  Election of Director;
Appointment of Principal Officer

     Beacon Power Corporation (the "Company") has announced that effective as of
May 6, 2005,  Philip J. Deutch resigned as a director of the Company and John C.
Fox was  appointed  to fill the  vacancy  created by Mr.  Deutch's  resignation.
Messrs.  F. William Capp, Jack P. Smith,  Stephen P. Adik,  Kenneth M. Socha and
William E. Stanton will  continue as  directors of the Company.  Mr.  Deutch has
indicated  that his reasons for deciding to resign are personal and unrelated to
his service as a director of the Company. Mr. Deutch has also indicated that his
resignation  is not due to any  disagreement  with  the  Company  on any  matter
relating to the Company's operations, policies or practices.

     Mr.  Fox is also a  member  of the  board  of  directors  of  NxtPhase  T&D
Corporation  ("NxtPhase").  The Company  and a  wholly-owned  subsidiary  of the
Company  have  entered  into an  Arrangement  Agreement  with  NxtPhase  for the
acquisition  of all  outstanding  common shares and Class A preferred  shares of
NxtPhase.  Mr. Fox is a managing director of Perseus,  L.L.C., which through its
affiliates, is the largest stockholder of each of NxtPhase and the Company.

     Since the  beginning  of the last  fiscal  year for each of the Company and
NxtPhase, there have been no transactions, or series of transactions between Mr.
Fox or any member of his immediate  family and either the Company or NxtPhase in
which the amount involved exceeded $60,000 and in which Mr. Fox or his immediate
family has, or will have, a direct or indirect material interest.

     The  Company  will  provide  Mr.  Fox with stock  options  and cash fees in
accordance  with  its  policies  for  its  directors.  For  the  vesting  period
commencing May 6 and ending  November 30, 2005, the options  granted to him will
cover 29,168 common shares, at an exercise price of $0.87 per share. The options
vest in equal monthly installments, and vesting ceases when Mr. Fox is no longer
a director. Vested options are forfeited in the event of breach of conduct.

     A copy of the Company's form of Indemnification  Agreement for directors is
filed as Exhibit  10.1 to this  Current  Report on Form 8-K and is  incorporated
herein by reference. The Company will sign a copy of this agreement with Mr. Fox
and its other directors, and will also sign a substantially identical version of
it with its executive officers.  The current form represents an amendment to the
form used in the past,  principally  in how it  defines  change of  control  for
purposes of the  agreement's  provisions that give  indemnified  persons certain
protective rights when such a change has occurred.  The principal changes in the
definition  include increasing from 35% to 40% the percentage that a stockholder
must obtain for such  percentage  to  constitute a change of control,  exempting
from the definition a merger in which the persons who own the Company before the
merger own at least 80% of the Company after the merger,  and clarifying that no
event  constitutes  a change  of  control  if the  event  has been  approved  by
appropriate members of the Board of Directors.

     A copy of the press release  issued by the Company on May 10, 2005 is filed
as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by
reference.

                  Section 9 - Financial Statements and Exhibits

Item 9.01 Financial Statements and Exhibits.

(c) Exhibits

     10.1    Form of Indemnification Agreement.

     99.1    Press release of Beacon Power Corporation dated May 10, 2005.



                                    Signature

         Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.


                                       BEACON POWER CORPORATION



Date:  May 10, 2005                    By:/s/ James M. Spiezio
                                          -----------------------
                                       Name:  James M. Spiezio
                                       Title:  Chief Financial Officer




                                  Exhibit Index

Exhibit No.                Description

10.1     Form of Indemnification Agreement.

99.1     Press release of Beacon Power Corporation dated May 10, 2005.