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 14, 2004



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


               Delaware               000-31973             04-3372365
     ------------------------- ----------------------- --------------------
          (State or Other           (Commission           (IRS Employer
   Jurisdiction of Incorporation)   File Number)        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








ITEM 12. RESULTS OF OPERATIONS AND FINANCIAL CONDITION.

     On May 14,  2004,  the  Registrant  issued a press  release  to report  its
financial  results for the quarter ended March 31, 2003, and to announce that it
had filed Form 10-K/A. A copy of the press release is furnished pursuant to this
Item 12 as Exhibit 99.1 to this current report on Form 8-K.

The following is filed as an exhibit to this report.

Exhibit No.            Description of Exhibit
- -----------            ----------------------
99.1                   Press Release issued May 14, 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: May 17, 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
- ------         -----------
99.1           The Registrant's Press Release dated May 14, 2004.