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.