EXHIBIT 23.1

INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM CONSENT


We consent to the  incorporation  by reference  in  Registration  Statement  No.
333-50260 of Beacon Power  Corporation  on Form S-8 of our report dated February
18,  2005  appearing  in this  Annual  Report  on  Form  10-K  of  Beacon  Power
Corporation for the year ended December 31, 2004.

/s/ Miller Wachman, LLP

Boston, MA
March 28, 2005