Item 8.01 Other Events.

As previously disclosed in a Form 8-K on February 20, 2009, Beacon Power Corporation (the "Company" or "Beacon") entered into a Common Stock Purchase Agreement (the "Agreement") whereby the Company agreed to issue to Seaside 88, LP ("Seaside") and Seaside agreed to buy $1 million worth of shares of Beacon Common Stock once each month at a monthly closing on the 20th day of each month (or if that day is not a business day, then on the next business day) for a period of six months commencing on February 20, 2009 at a purchase price equal to 80% of the volume weighted average trading prices of the Company's common stock, par value $0.01 per share (the "Common Stock") during the five-day period immediately preceding each monthly issuance, but in no event below $0.20 per share. Accordingly, on March 20, 2009 Seaside purchased 2,896,200 shares of the Company's Common Stock at a price per share of $0.4316 having an aggregate value of $1,000,000 and, pursuant to the Agreement, the Company paid Seaside $9,000 in non-accountable expenses.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

5.1 Opinion of Edwards Angell Palmer & Dodge LLP

23.2 Consent of Edwards Angell Palmer & Dodge LLP (contained in Exhibit 5.1)

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