EXHIBIT 99.1

                                                        FOR IMMEDIATE RELEASE
                                                       Contact: James Spiezio
                                                     Beacon Power Corporation
                                                                 978-694-9121
                                                      spiezio@beaconpower.com


                BEACON POWER ANNOUNCES FIRST-QUARTER 2005 RESULTS

Wilmington,  MA - May 16, 2005 - Beacon  Power  Corporation  (Nasdaq:  BCON),  a
company that designs  advanced  products for electric power and grid voltage and
frequency  regulation,  today  announced  its  financial  results  for the first
quarter ended March 31, 2005.

For the first quarter of 2005,  Beacon Power reported  revenue of $636,000 and a
net loss of $2.2 million, or ($0.05) per share, compared with revenue of $57,000
and a net loss of $2.1  million,  or ($0.05) per share,  in the first quarter of
2004.

During the first quarter of 2005, Beacon Power incurred costs of $0.5 million in
R&D, $1.2 million in SG&A,  recorded a contract loss reserve for its  government
contracts of $0.5  million and  depreciation  of $43,199.  At March 31, 2005 the
company had $3.3 million in cash and cash  equivalents.  The  company's  working
capital was $2.2 million.

"This  quarter we  recognized  revenue  associated  with the Smart Energy Matrix
demonstration  systems we're  building for  California  and New York," said Bill
Capp,  president  and CEO. "We continue to make progress  towards  completion of
these  contracts,  with the first system expected to ship to California in July.
Representatives  from the agencies  involved,  including the  California  Energy
Commission,  the New York State Energy Research and Development  Authority,  and
the U.S. Department of Energy, visited Beacon last month to review the projects,
and we believe that they were pleased to see the first  upgraded  6kWh  flywheel
operating in the Smart Energy Matrix."

"The recent  investment  commitment of $3 million by Perseus L.L.C. will provide
us with the working capital needed to deliver these demonstration systems," Capp
added.  "We believe that the subsequent  test results will validate the economic
and  performance  advantages  of Beacon's  flywheel  technology as it applies to
frequency  regulation  for the  power  grid,  and we look  forward  to our first
installation this summer."

On May 13,  2005 the Company  received a letter  from Nasdaq  dated May 13, 2005
indicating  that the  Company's  common stock has not met the $1.00  minimum bid
price  requirement  for continued  listing for the past 30 consecutive  business
days and that the  Company's  common stock is,  therefore,  subject to delisting
from the Nasdaq SmallCap Market, pursuant to Nasdaq Marketplace Rule 4310(c)(4).
Therefore in accordance with Marketplace Rule 4310(c)(8)(D), the Company will be
provided 180 calendar days, or until  November 9, 2005, to regain  compliance or
face delisting on November 9, 2005.

"To attain  compliance the Company's  common stock must close at $1.00 per share
or more for a minimum of ten consecutive  business days before November 9, 2005.
In the event that the Company's stock does not meet this requirement,  but meets
the  requirements  for inclusion on the Nasdaq  SmallCap  Market initial listing
requirements  as set forth in  Marketplace  Rule  4310(c),  the  Company  may be
granted an additional 180 calendar day period to regain  compliance," said James
Spiezio, CFO of Beacon Power.

About Beacon Power Corporation

Beacon Power Corporation designs sustainable energy storage and power conversion
solutions that would provide reliable electric power for the utility,  renewable
energy, and distributed  generation  markets.  Beacon's Smart Energy Matrix is a
design concept for a megawatt-level, utility-grade flywheel-based energy storage
solution that would  provide  sustainable  power quality  services for frequency
regulation,  and support the demand for reliable,  distributed electrical power.
Beacon  is  a  publicly  traded  company  with  its  research,  development  and
manufacturing    facility   in   the   U.S.   For   more   information,    visit
www.beaconpower.com.

For more information,  please contact James Spiezio,  Chief Financial Officer at
Beacon  Power   Corporation,   tel.   978.694.9121;   fax  978.694.9127;   email
spiezio@beaconpower.com,  or send mail to 234 Ballardvale Street, Wilmington, MA
01887. Visit Beacon Power on the Internet at www.beaconpower.com.

Safe Harbor  Statements under the Private  Securities  Litigation  Reform Act of
1995:

Material  contained in this press  release may include  statements  that are not
historical facts and are considered  "forward-looking" within the meaning of the
Private  Securities   Litigation  Reform  Act  of  1995.  These  forward-looking
statements reflect Beacon Power Corporation's  current views about future events
and financial performances.  These forward-looking  statements are identified by
the use of terms and phrases such as "believe," "expect," "plan,"  "anticipate,"
and similar expressions identifying forward-looking statements. Investors should
not rely on forward-looking  statements because they are subject to a variety of
risks,  uncertainties,  and other  factors  that could cause  actual  results to
differ  materially from Beacon Power  Corporation's  expectation.  These factors
include:  a short  operating  history;  a  history  of  losses  and  anticipated
continued  losses from operations;  a need to raise additional  capital combined
with  a  questionable  ability  to do  so;  conditions  in  target  markets;  no
experience  manufacturing any product on a commercial basis;  limited commercial
contracts  for  sales  to  date;  little  experience   managing   operations  in
geographically  dispersed locations;  the dependence of sales on the achievement
of product development and commercialization  milestones; the uncertainty of the
political and economic climate of any foreign  countries into which Beacon hopes
to  sell or in  which  it  operates,  including  the  uncertainty  of  enforcing
contracts and the potential  substantial  fluctuation in currency exchange rates
in  those  countries;   significant  technological  challenges  to  successfully
complete  product  development;  dependence on  third-party  suppliers;  intense
competition from companies with greater financial resources; possible government
regulation that would impede the ability to market  products;  possible  product
liability claims and the negative  publicity which could result;  any failure to
protect  intellectual  property;  the  possible  need in the  future to hire and
retain  key  executives,  particularly  in  light of the  substantial  workforce
reductions  during 2001 and 2002;  the recent  volatility  in the stock price of
companies  operating in the same sector;  the  difficulties  that often arise in
integrating operations of companies after a merger or acquisition;  the power of
controlling  shareholders  and the limited  ability of others to  influence  the
outcome of matters put to the vote of shareholders. These factors are elaborated
upon and other  factors  may be  disclosed  from  time to time in  Beacon  Power
Corporation's filings with the Securities and Exchange Commission.  Beacon Power
Corporation  expressly  does not  undertake  any duty to update  forward-looking
statements.






                     BEACON POWER CORPORATION AND SUBSIDIARY
                           CONSOLIDATED BALANCE SHEETS

                                                            March 31,      December 31,
                                                               2005             2004
                                                          (unaudited)       (audited)
                                                        -------------    -------------
Assets
Current assets:
                                                                   
     Cash and cash equivalents ......................   $   3,334,595    $   5,097,188
     Accounts receivable, trade .....................             895           52,105
     Inventory ......................................            --            222,593
     Unbilled costs on government contracts .........         416,705             --
     Prepaid expenses and other current assets ......         599,658          817,396
                                                        -------------    -------------
        Total current assets ........................       4,351,853        6,189,282

Property and equipment, net .........................         277,316          258,647
Restricted cash .....................................         310,011          310,011
Other assets ........................................         354,484          327,646
                                                        -------------    -------------
Total assets ........................................   $   5,293,664    $   7,085,586
                                                        =============    =============

Liabilities and Stockholders' Equity
Current liabilities:
     Accounts payable ...............................   $     184,947    $     389,189
     Accrued compensation and benefits ..............         196,699          130,609
     Other accrued expenses .........................         466,196          393,569
     Accrued contract loss ..........................         320,646             --
     Restructuring reserve ..........................         976,758        1,062,644
                                                        -------------    -------------
        Total current liabilities ...................       2,145,246        1,976,011

Stockholders' equity:
     Common stock ...................................         437,971          437,888
     Deferred stock compensation ....................        (435,712)        (707,167)
     Additional paid-in-capital .....................     134,424,216      134,411,911
     Deficit accumulated during the development stage    (131,178,397)    (128,933,397)
     Less: treasury stock, at cost ..................         (99,660)         (99,660)
                                                        -------------    -------------
        Total stockholders' equity ..................       3,148,418        5,109,575

Total liabilities and stockholders' equity ..........   $   5,293,664    $   7,085,586
                                                        =============    =============





                     BEACON POWER CORPORATION AND SUBSIDIARY
                      CONSOLIDATED STATEMENTS OF OPERATIONS
                                   (unaudited)

                                               Three months ended March 31,
                                                    2005            2004
                                              ------------    ------------
Revenue ...................................        636,134          57,408
Cost of goods sold ........................        670,507          75,779
                                              ------------    ------------
Gross profit ..............................        (34,373)        (18,371)

Operating expenses:
     Selling, general and administrative ..      1,172,379       1,076,262
     Research and development .............        486,238       1,048,240
     Loss on sales and contract commitments        547,707            --
     Depreciation and amortization ........         18,191          46,587
                                              ------------    ------------
           Total operating expenses .......      2,224,515       2,171,089
                                              ------------    ------------

Loss from operations ......................     (2,258,888)     (2,189,460)
Other income, net .........................         13,888          40,733
                                              ------------    ------------
Loss to common shareholders ...............   $ (2,245,000)   $ (2,148,727)
                                              ============    ============
Loss per share, basic and diluted .........   $      (0.05)   $      (0.05)
                                              ============    ============
Weighted-average common shares outstanding      43,792,791      43,121,702
                                              ============    ============