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

                                    FORM 8-K

                       PURSUANT TO SECTION 13 OR 15(d) OF
                     THE SECURITIES AND EXCHANGE ACT OF 1934

        Date of Report (date of earliest event reported): August 30, 2004

                            BEACON POWER CORPORATION
             (Exact name of registrant as specified in its charter)

                                    Delaware
                  ---------------------------------------------
                 (State or other jurisdiction of incorporation)

                     000-31973                      04-3372365
               -----------------------   -------------------------------
               (Commission File Number) (IRS Employer Identification No.)

                        234 Ballardvale Street
                      Wilmington, Massachusetts           01887
                --------------------------------------- --------
               (Address of principal executive offices) (Zip Code)


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




Section 4 - Matters Related to Accountants and Financial Statements

Item 4.01   Changes in Registrant's Certifying Public Accountant

(a)  Previous independent accountants

     (i)  Effective   August  27,   2004,   Beacon  Power   Corporation's   (the
          "Registrant")  independent registered public accounting firm, Deloitte
          & Touche LLP ("Deloitte"), has decided not to stand for re-election as
          the independent  registered public accounting firm for the Registrant.
          Deloitte  performed  the review and audit of the  Company's  books and
          accounts for the fiscal  years  ending  December 31, 2003 and 2002 and
          has performed interim quarterly reviews through the quarter ended June
          30,  2004.  The  resignation  was the decision of Deloitte and was not
          recommended or approved by the Registrant's Audit Committee.

     (ii) Deloitte's  report for 2002 and 2003 contained an unqualified  opinion
          regarding  the  fair   presentation  of  the  Registrant's   financial
          statements,  but Deloitte's 2003 audit report contained an explanatory
          paragraph  expressing doubt about the Registrant's ability to continue
          as a going concern.

     (iii)There have been no disagreements  during the past two fiscal years and
          the subsequent  interim periods ending June 30, 2004 between  Deloitte
          and   management  of  the  Registrant  on  any  matter  of  accounting
          principles or practices,  financial  statement  disclosure or auditing
          scope  or  procedure,  which  disagreement,  if  not  resolved  to the
          satisfaction  of  Deloitte,  would have caused them to make  reference
          thereto in their reports on the financial statements for such years.

     (iv) During the two most recent  fiscal years and through  August 30, 2004,
          there have been no  reportable  events (as defined by  Regulation  S-K
          Item 304(a)(1)(v)).

     (v)  The  Registrant  has provided  Deloitte  with a copy of the  foregoing
          disclosure  and has requested  that Deloitte  furnish it with a letter
          addressed  to the  Securities  and  Exchange  Commission  (the  "SEC")
          stating whether or not it agrees with the above statements.  A copy of
          the letter  from  Deloitte  dated  August 30, 2004 is filed as Exhibit
          16.1 to this Form 8-K.

(b)  New independent accountants

     (i)  Management  of the  Registrant  is currently  evaluating a replacement
          independent registered public accounting firm, but has not yet engaged
          one.

Section 9 - Financial Statements and Exhibits

Item 9.01 Financial Statements and Exhibits

(c)  Exhibits

      16.1  Letter from Deloitte & Touche LLP to the Securities and Exchange
            Commission dated August 30, 2004.



                                   SIGNATURES

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: September 2, 2004                     /s/James M. Spiezio
                                            --------------------------
                                            Name: James M. Spiezio
                                            Title: Vice President of Finance,
                                            Chief Financial Officer,
                                            Treasurer and Secretary


                                  EXHIBIT INDEX

Exhibit
Number            Description
- ------            -----------
16.1              Letter from Deloitte & Touche, LLP to the Securities and
                  Exchange Commission dated August 30, 2004.