UNITED STATES
SECURITIES AND EXCHANGE COMMISSIONWashington, D.C. 20549

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FORM 10-Q

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|ý                                                             | QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 
|------------------------------------------------------------- | ----------------------------------------------------------------------------------------
|For the Quarterly Period Ended September 30, 2007            
|or                                                           
|o                                                             | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|For the transition period
from                             to

Commission file number 000-31973

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

|Delaware(State or other jurisdiction of
incorporation or organization)                   |  | 04-3372365(I.R.S. Employer Identification No.)
|---------------------------------------------------------------------------------------- |  | ----------------------------------------------
|234 Ballardvale Street
Wilmington, Massachusetts(Address of principal executive offices) |  | 01887-1032(Zip code)                          
|(978) 694-9121(Registrant's telephone number, including area code)                      

Indicate
by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90
days.    Yes ý No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer (as defined in Rule 12b-2 of
the Exchange Act).

Large
accelerated filer o                Accelerated filer o                Non-accelerated
filer ý

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange
Act).    Yes o No ý

The number of shares of the Registrant's common stock, par value $.01 per share, outstanding as of November 7, 2007 was 88,653,361.



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BEACON POWER CORPORATION AND SUBSIDIARY  (A Development Stage Company)  Table of Contents

|                              |  |                                                                                                                                                                                                      |  | Page
|----------------------------- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ----
|PART I. Financial Information |  |                                                                                                                                                                                                     
|Item 1.                       |  | Financial Statements                                                                                                                                                                                 |  |     
|                              |  | Consolidated Balance Sheets at September 30, 2007 (unaudited) and December 31, 2006 (audited).                                                                                                       |  | 2   
|                              |  | Unaudited Consolidated Statements of Operations for the three and nine months ended September 30, 2007 and 2006, and for the period from May 8, 1997 (date of inception) through September 30, 2007. |  | 3   
|                              |  | Unaudited Consolidated Statements of Cash Flows for the nine months ended September 30, 2007 and 2006 and for the period from May 8, 1997 (date of inception) through September 30, 2007.            |  | 4   
|                              |  | Notes to Unaudited Consolidated Financial Statements.                                                                                                                                                |  | 6   
|Item 2.                       |  | Management's Discussion and Analysis of Financial Condition and Results of Operations.                                                                                                               |  | 17  
|Item 3.                       |  | Quantitative and Qualitative Disclosures about Market Risk.                                                                                                                                          |  | 32  
|Item 4T.                      |  | Controls and Procedures.                                                                                                                                                                             |  | 32  
|PART II. Other Information    |  |                                                                                                                                                                                                     
|Item 1.                       |  | Legal Proceedings.                                                                                                                                                                                   |  | 33  
|Item 1A.                      |  | Risk Factors.                                                                                                                                                                                        |  | 33  
|Item 2.                       |  | Unregistered Sales of Equity Securities and Use of Proceeds.                                                                                                                                         |  | 33  
|Item 3.                       |  | Defaults Upon Senior Securities.                                                                                                                                                                     |  | 33  
|Item 4.                       |  | Submission of Matters to a Vote of Security Holders.                                                                                                                                                 |  | 33  
|Item 5.                       |  | Other Information.                                                                                                                                                                                   |  | 33  
|Item 6.                       |  | Exhibits.                                                                                                                                                                                            |  | 34  
|Signatures                    |  | 36                                                                                                                                                                                                  

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PART 1FINANCIAL INFORMATION

Item 1. Financial Statements

BEACON POWER CORPORATION AND SUBSIDIARY  (A Development Stage Company)  Consolidated Balance Sheets

|                                           |                                                                                                                                                                                | September 30,
2007         |            | December 31,
2006 |           
|------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | -------------------------- | ---------- | ----------------- | ----------
|
|Assets                                     |                                                                                                                                                                                |                            |            |                   |           
|Current assets:                            |                                                                                                                                                                                |                            |            |                   |           
|                                           | Cash and cash equivalents                                                                                                                                                      |                            | $          | 14,194,209        |           
|                                           | Accounts receivable, trade, net                                                                                                                                                |                            |            | 518,409           |           
|                                           | Unbilled costs on contracts in progress                                                                                                                                        |                            |            | 311,408           |           
|                                           | Prepaid expenses and other current assets                                                                                                                                      |                            |            | 1,202,289         |           
|                                           |                                                                                                                                                                                |                            |            |                   |           
|                                           |                                                                                                                                                                                | Total current assets       |            |                   | 16,226,315
|Property and equipment, net                |                                                                                                                                                                                |                            | 2,876,988  |                   |           
|Restricted cash                            |                                                                                                                                                                                |                            | 374,346    |                   |           
|                                           |                                                                                                                                                                                |                            |            |                   |           
|Total assets                               |                                                                                                                                                                                | $                          | 19,477,649 |                   | $         
|                                           |                                                                                                                                                                                |                            |            |                   |           
|Liabilities and Stockholders' Equity       |                                                                                                                                                                                |                            |            |                   |           
|Current liabilities:                       |                                                                                                                                                                                |                            |            |                   |           
|                                           | Accounts payable                                                                                                                                                               |                            | $          | 603,416           |           
|                                           | Accrued compensation and benefits                                                                                                                                              |                            |            | 955,298           |           
|                                           | Other accrued expenses                                                                                                                                                         |                            |            | 1,691,786         |           
|                                           | Advance billings on contracts                                                                                                                                                  |                            |            | 33,156            |           
|                                           | Accrued contract loss                                                                                                                                                          |                            |            | 156,734           |           
|                                           | Restructuring reserve                                                                                                                                                          |                            |            | 37,189            |           
|                                           |                                                                                                                                                                                |                            |            |                   |           
|                                           |                                                                                                                                                                                | Total current liabilities  |            |                   | 3,477,579 
|                                           |                                                                                                                                                                                |                            |            |                   |           
|Commitments and contingencies (Note 5)     |                                                                                                                                                                                |                            |            |                   |           
|Stockholders' equity:                      |                                                                                                                                                                                |                            |            |                   |           
|                                           | Preferred Stock, $.01 par value; 10,000,000 shares authorized;
no shares issued or outstanding                                                                                 |                            |            |                  |           
|                                           | Common stock, $.01 par value; 200,000,000 shares authorized;
76,675,515 and 59,524,687 shares issued and outstanding at September 30, 2007 and December 31, 2006, respectively |                            |            | 766,755           |           
|                                           | Additional paid-in-capital                                                                                                                                                     |                            |            | 175,324,628       |           
|                                           | Deficit accumulated during the development stage                                                                                                                               |                            |            | (159,378,474      | )         
|                                           | Treasury stock, 421,692 shares at cost                                                                                                                                         |                            |            | (712,839          | )         
|                                           |                                                                                                                                                                                |                            |            |                   |           
|                                           |                                                                                                                                                                                | Total stockholders' equity |            |                   | 16,000,070
|                                           |                                                                                                                                                                                |                            |            |                   |           
|Total liabilities and stockholders' equity |                                                                                                                                                                                | $                          | 19,477,649 |                   | $         
|                                           |                                                                                                                                                                                |                            |            |                   |           

See
notes to unaudited consolidated financial statements.

2

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BEACON POWER CORPORATION AND SUBSIDIARY  (A Development Stage Company)  Consolidated Statements of Operations (Unaudited)

|                                           |                                     | Three month(s) ended September 30, |            |           |           |            |           | Cumulative from
May 8, 1997
(date of inception)
through September 30,
2007 |           
|------------------------------------------ | ----------------------------------- | ---------------------------------- | ---------- | --------- | --------- | ---------- | --------- | -------------------------------------------------------------------------- | ----------
|
|
|Revenue                                    |                                     | $                                  | 372,515    |           | $         | 277,343    |           | $                                                                          | 1,214,550 
|Cost of goods sold                         |                                     |                                    | 351,311    |           |           | 237,986    |           |                                                                            | 1,163,102 
|                                           |                                     |                                    |            |           |           |            |           |                                                                            |           
|Gross profit                               |                                     |                                    | 21,204     |           |           | 39,357     |           |                                                                            | 51,448    
|Operating expenses:                        |                                     |                                    |            |           |           |            |           |                                                                            |           
|                                           | Selling, general and administrative |                                    |            | 1,388,185 |           |            | 1,715,617 |                                                                            |           
|                                           | Research and development            |                                    |            | 1,978,318 |           |            | 1,314,390 |                                                                            |           
|                                           | Loss on contract commitments        |                                    |            | (434,348  | )         |            | 279,083   |                                                                            |           
|                                           | Depreciation and amortization       |                                    |            | 42,723    |           |            | 24,334    |                                                                            |           
|                                           | Casualty loss (recovery)            |                                    |            | (9,024    | )         |            |          |                                                                            |           
|                                           | Restructuring charges               |                                    |            |          |           |            |          |                                                                            |           
|                                           | Loss on impairment of assets        |                                    |            |          |           |            |          |                                                                            |           
|                                           |                                     |                                    |            |           |           |            |           |                                                                            |           
|                                           |                                     | Total operating expenses           |            |           | 2,965,854 |            |           | 3,333,424                                                                  |           
|                                           |                                     |                                    |            |           |           |            |           |                                                                            |           
|Loss from operations                       |                                     |                                    | (2,944,650 | )         |           | (3,294,067 | )         |                                                                            | (9,357,750
|Other income (expense):                    |                                     |                                    |            |           |           |            |           |                                                                            |           
|                                           | Interest income                     |                                    |            | 124,300   |           |            | 115,079   |                                                                            |           
|                                           | Interest expense                    |                                    |            |          |           |            |          |                                                                            |           
|                                           | Gain on sale of investment          |                                    |            |          |           |            |          |                                                                            |           
|                                           | Other income (expense)              |                                    |            | 6,559     |           |            | 13,983    |                                                                            |           
|                                           |                                     |                                    |            |           |           |            |           |                                                                            |           
|                                           |                                     | Total other income (expense), net  |            |           | 130,859   |            |           | 129,062                                                                    |           
|                                           |                                     |                                    |            |           |           |            |           |                                                                            |           
|Net loss                                   |                                     |                                    | (2,813,791 | )         |           | (3,165,005 | )         |                                                                            | (8,969,535
|Preferred stock dividends                  |                                     |                                    |           |           |           |           |           |                                                                            |          
|Accretion of convertible preferred stock   |                                     |                                    |           |           |           |           |           |                                                                            |          
|                                           |                                     |                                    |            |           |           |            |           |                                                                            |           
|Loss to common shareholders                |                                     | $                                  | (2,813,791 | )         | $         | (3,165,005 | )         | $                                                                          | (8,969,535
|                                           |                                     |                                    |            |           |           |            |           |                                                                            |           
|Loss per share, basic and diluted          |                                     | $                                  | (0.04      | )         | $         | (0.06      | )         | $                                                                          | (0.13     
|                                           |                                     |                                    |            |           |           |            |           |                                                                            |           
|Weighted-average common shares outstanding |                                     |                                    | 72,661,975 |           |           | 59,218,443 |           |                                                                            | 69,844,813
|                                           |                                     |                                    |            |           |           |            |           |                                                                            |           

See
notes to unaudited consolidated financial statements.

3

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BEACON POWER CORPORATION AND SUBSIDIARY  (A Development Stage Company)  Consolidated Statements of Cash Flows (Unaudited)

|                                      |                                                                             |                                                       |                                       |            |            | Cumulative from
May 8, 1997
(date of inception)
through September 30,
2007 |           
|------------------------------------- | --------------------------------------------------------------------------- | ----------------------------------------------------- | ------------------------------------- | ---------- | ---------- | -------------------------------------------------------------------------- | ----------
|
|
|Cash flows from operating activities: |                                                                             |                                                       |                                       |            |            |                                                                            |           
|                                      | Net loss                                                                    |                                                       | $                                     | (8,969,535 | )          | $                                                                          | (9,259,257
|                                      | Adjustments to reconcile net loss to net cash used in operating activities: |                                                       |                                       |            |            |                                                                            |           
|                                      |                                                                             | Depreciation and amortization                         |                                       |            | 99,364     |                                                                            |           
|                                      |                                                                             | Loss (gain) on sale of fixed assets                   |                                       |            | (1,317     | )                                                                          |           
|                                      |                                                                             | Impairment of assets, net                             |                                       |            | 553        |                                                                            |           
|                                      |                                                                             | (Expenses paid) restructuring charge                  |                                       |            | (310,219   | )                                                                          |           
|                                      |                                                                             | Interest expense relating to issuance of warrants     |                                       |            |           |                                                                            |           
|                                      |                                                                             | Non-cash charge for change in option terms            |                                       |            |           |                                                                            |           
|                                      |                                                                             | Non-cash charge for settlement of lawsuit             |                                       |            |           |                                                                            |           
|                                      |                                                                             | Amortization of deferred consulting expense, net      |                                       |            |           |                                                                            |           
|                                      |                                                                             | Amortization of deferred stock compensation           |                                       |            |           |                                                                            |           
|                                      |                                                                             | Options and warrants issued for consulting services   |                                       |            |           |                                                                            |           
|                                      |                                                                             | Services and interest expense paid in preferred stock |                                       |            |           |                                                                            |           
|                                      |                                                                             | Gain on sale of investments                           |                                       |            |           |                                                                            |           
|                                      |                                                                             | Stock-based compensation                              |                                       |            | 1,450,635  |                                                                            |           
|                                      |                                                                             | Deferred rent                                         |                                       |            | (610,363   | )                                                                          |           
|                                      | Changes in operating assets and liabilities:                                |                                                       |                                       |            |            |                                                                            |           
|                                      |                                                                             | Accounts receivable                                   |                                       |            | (12,007    | )                                                                          |           
|                                      |                                                                             | Unbilled costs on government contracts                |                                       |            | (178,168   | )                                                                          |           
|                                      |                                                                             | Prepaid expenses and other current assets             |                                       |            | 185,350    |                                                                            |           
|                                      |                                                                             | Accounts payable                                      |                                       |            | 150,339    |                                                                            |           
|                                      |                                                                             | Accrued compensation and benefits                     |                                       |            | 499,223    |                                                                            |           
|                                      |                                                                             | Advance billings on contracts                         |                                       |            | (412,563   | )                                                                          |           
|                                      |                                                                             | Accrued interest                                      |                                       |            |           |                                                                            |           
|                                      |                                                                             | Accrued loss on contract commitments                  |                                       |            | (664,298   | )                                                                          |           
|                                      |                                                                             | Other accrued expenses and current liabilities        |                                       |            | 856,954    |                                                                            |           
|                                      |                                                                             |                                                       |                                       |            |            |                                                                            |           
|                                      |                                                                             |                                                       | Net cash used in operating activities |            |            | (7,916,052                                                                 | )         
|                                      |                                                                             |                                                       |                                       |            |            |                                                                            |           
|Cash flows from investing activities: |                                                                             |                                                       |                                       |            |            |                                                                            |           
|                                      | Purchase of investments                                                     |                                                       |                                       |           |            |                                                                            |          
|                                      | Sale of investments                                                         |                                                       |                                       |           |            |                                                                            |          
|                                      | Restricted cash                                                             |                                                       |                                       | (200,000   | )          |                                                                            |          
|                                      | Increase in other assets                                                    |                                                       |                                       |           |            |                                                                            |          
|                                      | Purchases of property and equipment                                         |                                                       |                                       | (2,564,259 | )          |                                                                            | (142,524  
|                                      | Sale of property and equipment                                              |                                                       |                                       | 4,077      |            |                                                                            |           
|                                      |                                                                             |                                                       |                                       |            |            |                                                                            |           
|                                      |                                                                             | Net cash used in investing activities                 |                                       |            | (2,760,182 | )                                                                          |           
|                                      |                                                                             |                                                       |                                       |            |            |                                                                            |           
|                                      |                                                                             |                                                       |                                       |            |            |                                                                            |           

4

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|Cash flows from financing activities:             |                                                  |                                                     |            |            |            |            |        |        |            |           
|------------------------------------------------- | ------------------------------------------------ | --------------------------------------------------- | ---------- | ---------- | ---------- | ---------- | ------ | ------ | ---------- | ----------
|                                                  | Initial public stock offering, net of expenses   |                                                     |            |           |            |            |       |        |            | 49,341,537
|                                                  | Stock offerings, net of expenses                 |                                                     |            | 18,848,653 |            |            |       |        |            | 35,957,130
|                                                  | Payment of dividends                             |                                                     |            |           |            |            |       |        |            | (1,159,373
|                                                  | Shares issued under employee stock purchase plan |                                                     |            | 10,557     |            |            | 10,302 |        |            | 162,898   
|                                                  | Exercise of employee stock options               |                                                     |            | 43,282     |            |            | 28,600 |        |            | 2,246,904 
|                                                  | Stock and warrants issued to landlord            |                                                     |            | 716,614    |            |            |       |        |            | 716,614   
|                                                  | Issuance of preferred stock                      |                                                     |            |           |            |            |       |        |            | 32,868,028
|                                                  | Repayment of subscription receivable             |                                                     |            |           |            |            |       |        |            | 5,000,000 
|                                                  | Proceeds from capital leases                     |                                                     |            |           |            |            |       |        |            | 495,851   
|                                                  | Repayment of capital leases                      |                                                     |            |           |            |            |       |        |            | (1,031,395
|                                                  | Repurchase company stock                         |                                                     |            |           |            |            |       |        |            | (613,179  
|                                                  | Proceeds from notes payable issued to investors  |                                                     |            |           |            |            |       |        |            | 3,550,000 
|                                                  |                                                  |                                                     |            |            |            |            |       
|                                                  |                                                  | Net cash provided by (used in) financing activities |            |            | 19,619,106 |            |        | 38,902 |            |           
|                                                  |                                                  |                                                     |            |            |            |            |       
|(Decrease) increase in cash and cash equivalents  |                                                  |                                                     | 8,942,872  |            |            | (5,725,731 | )      |        | 14,194,209 |           
|Cash and cash equivalents, beginning of period    |                                                  |                                                     | 5,251,337  |            |            | 13,890,162 |        |        |           |           
|                                                  |                                                  |                                                     |            |            |            |            |       
|Cash and cash equivalents, end of period          |                                                  | $                                                   | 14,194,209 |            | $          | 8,164,431  |        | $      | 14,194,209 |           
|                                                  |                                                  |                                                     |            |            |            |            |       
|Supplemental disclosure of cash flow information: |                                                  |                                                     |            |            |            |            |        |        |            |           
|                                                  | Cash paid for interest                           |                                                     | $          |           |            | $          |       |        | $          | 488,126   
|                                                  |                                                  |                                                     |            |            |            |            |       
|                                                  | Cash paid for taxes                              |                                                     | $          |           |            | $          |       |        | $          | 32,750    
|                                                  |                                                  |                                                     |            |            |            |            |       
|                                                  | Assets acquired through capital lease            |                                                     | $          |           |            | $          |       |        | $          | 535,445   
|                                                  |                                                  |                                                     |            |            |            |            |       

See
notes to unaudited consolidated financial statements.

5

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BEACON POWER CORPORATION AND SUBSIDIARY  (A Development Stage Company)  Notes to Unaudited Consolidated Financial Statements

Note 1. Nature of Business and Operations

Nature of Business

Beacon Power Corporation (the "Company", "Beacon", "we", "our", or "us") (a development stage company) was incorporated on May 8, 1997. We design, develop
and expect to commercialize advanced products and services to support stable, reliable and efficient electricity grid operation. Our immediate business strategy is to commercialize our patented
flywheel energy storage technology to perform frequency regulation services on the grid. To achieve this strategy, we have entered into a long-term lease on a manufacturing facility and we
expect to move our operations into this facility in November of this year. Additionally, we have filed a Small Generator Interconnection Request application with the New York Independent System
Operator (NYISO). This interconnection application was based on design work for Beacon's 20-megawatt plant that was recently completed.

Our
Smart Energy Matrix, which has been approved for use in three of the country's five open-bid regulation markets, is designed to be a non-polluting, megawatt-
level, utility-grade flywheel-based solution that would provide sustainable frequency regulation services. For each plant location, we will need to complete the associated site acceptance process,
including securing all permits and licenses per local and national codes. We believe that our sustainable energy storage and power conversion solutions can help provide reliable electric power for the
utility, renewable energy, and distributed generation markets. In addition, we believe as the commercialization of our technologies continues other cost-effective applications for our
flywheel systems will develop that will provide additional revenues. Because we have not yet generated a significant amount of revenue from our principal operations, we are accounted for as a
development stage company under Statement of Financial Accounting Standards No. 7.

During
2000, we completed an initial public offering of our common stock and raised approximately $49.3 million net of offering expenses, and during 2005, we raised approximately
$17 million via private placements of our common stock. During 2007, net of offering expenses, we have raised approximately $42.6 million as a result of three financings. In the first
quarter we raised approximately $9.6 million through the sale of our common stock in a private placement. In the third and fourth quarter we raised approximately $9.2 million and
$23.8 million, respectively, through the sale of common stock and warrants pursuant to our shelf registration statement. We believe that the capital raised this year will provide sufficient
funding for us to continue to implement our business plan into the fourth quarter of 2008.

6

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Operations

We have experienced net losses since our inception and, as of September 30, 2007, had an accumulated deficit of approximately $159 million. We are
focused on the commercialization of our Smart Energy Matrix flywheel system for frequency regulation and completion of our government research and development contracts. The deployment of
our Smart Energy Matrix flywheel system for frequency regulation will require substantial additional outlays of capital that we expect to fund primarily through the use of project
finance. We expect to have positive EBITDA (earnings before interest, taxes, depreciation and amortization) and be cash flow positive by 2010; however, we will need to secure project financing for the
construction of our frequency regulation facilities, and if we are not able to obtain sufficient financing to continue to deploy regulation facilities we may need to raise additional capital in 2008
and beyond through the sale of shares of the company's stock. Based on our forecasted cash usage rates, we estimate that we have adequate cash to fund operations into the fourth quarter of 2008.
Estimated cash outlays to move operations to our new corporate location and to close out the lease on the Wilmington facility are expected to be approximately $0.7 million. The net cash
required for structural improvements at the Tyngsboro facility to support our administrative, research and development and manufacturing requirements is expected to be approximately
$5.0 million. In the short term, capital equipment of approximately $1.0 million will be required to meet our 2008 production schedule. Additional capital expenditures will be required
in the future to maximize plant capacity. The amount and timing of these expenditures are dependent on requirements of equipment needed to meet production schedules. Our business model is to maximize
the use of project financing for the future deployment of frequency regulation facilities. To the extent financing does not provide sufficient funding, we will seek to obtain additional equity
investments as needed to cover expenses relating to continuing operations including ongoing research and development, ramping up our manufacturing and assembly capacity, and building
revenue-generating frequency regulation facilities.

Note 2. Basis of Presentation and Summary of Significant Accounting Policies

Basis of Presentation

The accompanying unaudited consolidated financial statements have been prepared using accounting principles generally accepted in the United States of America
except that certain information and footnote disclosures normally included in consolidated financial statements prepared in accordance with generally accepted accounting principles have been condensed
or omitted in this Form 10-Q. We suggest that the consolidated financial statements presented herein be read in conjunction with our consolidated financial statements and notes
thereto included in our Annual Report on Form 10-K and Form 10-K/A, for the year ended December 31, 2006. In our management's opinion, all adjustments,
consisting of normal recurring accruals considered necessary for a fair presentation have been included in the accompanying unaudited financial statements. Operating results for the nine months ended
September 30, 2007 are not necessarily indicative of the results that may be expected for the full year ending December 31, 2007.

7

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Going Concern

The accompanying consolidated financial statements have been prepared on a going concern basis, which contemplates the realization of assets and the satisfaction
of liabilities in the normal course of business. We have had minimal revenues, and incurred losses of approximately $159 million since our inception, including losses during the nine months
ending September 30, 2007 of approximately $9.0 million. We had approximately $14.2 million of cash and cash equivalents on hand at September 30, 2007. Subsequent to the
end of the third quarter we completed an equity raise of approximately $23.8 million net of expenses through the sale of common stock and warrants pursuant to our shelf registration statement.
Since our operating cash requirements and the costs associated with deploying frequency regulation facilities may exceed any cash generated from our current operations and fundraising efforts, we may
be unable to continue as a going concern. The consolidated financial statements contained herein do not include any adjustments relating to the recoverability and classification of liabilities that
might be necessary should we be unable to continue as a going concern.

We
recognize that our continuation as a going concern is dependent upon our ability to generate sufficient cash flow to allow us to satisfy our obligations on a timely basis. In the long
term, the generation of sufficient cash flow is dependent on our ability to successfully establish a share of the frequency regulation market based on deploying our Smart Energy Matrix
flywheel systems, as well as obtaining sufficient project or equity financing to develop our frequency regulation facilities.

Consolidation

The accompanying consolidated financial statements include the accounts of Beacon Power Corporation and our subsidiary Beacon Power Securities Corporation. Our
former subsidiary, Beacon Acquisition Co., was inactive in 2005 and was dissolved in January 2006. All significant inter-company accounts and transactions have been eliminated in consolidation.

Loss per ShareBasic and Diluted

Basic and diluted losses per share have been computed using the weighted-average number of shares of common stock outstanding during each period. Warrants,
options and other securities exercisable for common shares are used in the calculation of fully-diluted EPS only if their conversion to common shares would decrease income or increase loss per share
from continuing operations. Since we incurred net losses during both the quarter and nine months ended September 30, 2007 and 2006, including the potential conversion of warrants and options in
the diluted EPS calculation would decrease loss per share. Thus, they are considered anti-dilutive and are not included in the calculation of earnings per share.

Summary of Significant Accounting Policies

Use of Estimates

The preparation of consolidated financial statements in accordance with accounting principles generally accepted in the United States of America requires
management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial
statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

8

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Stock-Based Compensation

During the first quarter of 2006, we adopted the provisions of, and accounted for, stock-based compensation in accordance with the Financial Accounting Standards
Board's Statement of Financial Accounting Standards No. 123R ("SFAS 123R"), "Share-Based Payment." Under the fair value recognition provisions of SFAS 123R, stock-based
compensation cost is measured at the grant date based on the fair value of the award and is recognized as an expense as it is earned over the requisite service period, which is the vesting period. To
implement this standard, we elected the modified-prospective transition method, under which prior periods are not revised for comparative purposes. The valuation provisions of SFAS 123R apply
to new grants and to grants that were outstanding as of the effective date and are subsequently modified. Estimated compensation expense for grants that were outstanding as of the effective date will
be recognized over the remaining vesting period using the compensation cost estimated for the SFAS 123 pro forma disclosures.

The
adoption of SFAS 123R had a material impact on our consolidated financial position and results of operations.

"Lease Obligation and Deferred Rent

During July 2007, we signed a new seven-year operating lease with escalating payments on a new facility in Tyngsboro, Massachusetts. As part of the this
lease agreement, we issued to the landlord 150,000 shares of our common stock and a warrant exercisable for 500,000 shares of our common stock in return for lower cash payments under the lease. (See
Note 5: Commitments and Contingencies.) Additionally, the landlord has agreed to reimburse the Company for certain leasehold improvements. We have recorded rental expense on a straight line
basis in accordance with SFAS No. 13 "Accounting for Leases." The deferred rent included in Prepaid expenses and other current assets as of September 30, 2007 is approximately $610,000."

Note 3. Accounts Receivable

Our trade accounts receivable include amounts due from customers and are reported net of a reserve for uncollectible accounts as follows:

|                           |  | September 30,
2007 |         | December 31,
2006 |  
|-------------------------- |  | ------------------ | ------- | ----------------- | -
|Accounts receivable, trade |  | $                  | 520,977 |                   | $
|Reserve                    |  |                    | (2,568  | )                 |  
|                           |  |                    |         |                   |  
|Accounts receivable, net   |  | $                  | 518,409 |                   | $
|                           |  |                    |         |                   |  

Two
of our research and development contracts contain holdback provisions that allow our customers to withhold 10% from each invoice payment. At September 30, 2007 and
December 31, 2006 we had approximately $67,600 and $54,600, respectively, of holdbacks in our accounts receivable balance. These holdbacks are payable once work has been satisfactorily
completed and the final report has been received and approved. We believe these holdbacks will be collected upon completion of the contracts, and therefore have not recorded any reserve against these
amounts.

9

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Note 4. Property and Equipment

Details of our property and equipment follow:

|                                               |                             | Estimated
Useful Lives |  | September 30,
2007 |            | December 31,
2006 |  
|---------------------------------------------- | --------------------------- | ---------------------- |  | ------------------ | ---------- | ----------------- | -
|Construction in Progress                       |                             | Varied                 |  | $                  | 2,162,135  |                   | $
|Machinery and equipment                        |                             | 5 years                |  |                    | 1,102,495  |                   |  
|Service vehicles                               |                             | 5 years                |  |                    | 16,763     |                   |  
|Furniture and fixtures                         |                             | 7 years                |  |                    | 255,940    |                   |  
|Office equipment                               |                             | 3 years                |  |                    | 1,521,632  |                   |  
|Leasehold improvements                         |                             | Lease term             |  |                    | 533,352    |                   |  
|Equipment under capital lease obligations      |                             | Lease term             |  |                    | 850,579    |                   |  
|                                               |                             |                        |  |                    |            |                   |  
|                                               | Total                       |                        |  |                    | $          | 6,442,896         |  
|Less accumulated depreciation and amortization |                             |                        |  |                    | (3,565,908 | )                 |  
|                                               |                             |                        |  |                    |            |                   |  
|                                               | Property and equipment, net |                        |  |                    | $          | 2,876,988         |  
|                                               |                             |                        |  |                    |            |                   |  

All
purchased or developed capital assets are classified as "Construction in Progress" when initially acquired, and reclassified to the appropriate asset account upon being placed in
service. No depreciation expense is recorded for Construction in Progress since these items are not yet in service. As of September 30, 2007, the amount shown as Construction in Progress
included approximately $1.7 million in leasehold improvements at the Tyngsboro facility, approximately $146,000 in production inventory materials to be used to manufacture flywheels for our
initial frequency regulation facility and approximately $302,000 for equipment, software and tooling not yet placed into service.

Note 5. Commitments and Contingencies

The following table summarizes our cash commitments at September 30, 2007:

|             |                   | Description of Commitment
|------------ | ----------------- | -------------------------
|
|Year ending: |                   |                          
|             | December 31, 2007 |                          
|             | December 31, 2008 |                          
|             | December 31, 2009 |                          
|             | December 31, 2010 |                          
|             | December 31, 2011 |                          
|             | December 31, 2012 |                          
|             | Thereafter        |                          
|             |                   |                          
|             | Total Commitments |                          
|             |                   |                          

In
July 2007, we signed a seven-year lease on a new corporate headquarters that will significantly expand our manufacturing capacity and provide sufficient space to
continue our research and development activities. Our new facility is located at 65 Middlesex Road, Tyngsboro, MA. The new 103,000 square foot facility, which will have manufacturing capacity for the
production of more than 1,000 flywheels per year, is currently being renovated and built out to our specifications, and we expect to relocate all operations to our new corporate home in November of
2007. The lease on our current facility in Wilmington, MA will expire at the end of November 2007.

10

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As
part of the Tyngsboro lease agreement, we issued to the landlord 150,000 shares of our common stock that were issued pursuant to our registration statement on
Form S-3 filed on August 17, 2007, which we amended on August 27, 2007 and became effective on August 28, 2007, and a warrant exercisable for 500,000 shares of
our common stock pursuant to an exemption from registration under the Securities Act of 1933, as amended, in return for lower cash payments payable by us under the lease. We have provided the
Wilmington and Tyngsboro lessors with irrevocable letters of credit securing our performance under these leases with a balance at September 30, 2007 of $374,346, which are reduced periodically
during the lease terms. These letters of credit are secured by a cash deposit, which is included in restricted cash in the accompanying consolidated balance sheets. In addition, we are responsible for
real estate taxes and all operating expenses of the Tyngsboro facility.

Estimated
cash outlays to move and to close out the lease on the Wilmington facility are expected to be approximately $.7 million. The net cash required for structural
improvements at the Tyngsboro facility to support our office, research and development and manufacturing requirements is expected to be approximately $5.0 million. In the short term, capital
equipment of approximately $1.0 million will be required to meet our 2008 production schedule. Additional capital expenditures will be required in the future to optimize the plant for maximum
capacity. The amount and timing of these expenditures are dependent on requirements of equipment needed to meet production schedules as well as having sufficient funding.

During
the third quarter, we successfully completed all critical performance tests on the Smart Energy 25 flywheel, and as a result of these test results we have placed orders for all
materials required to build our first 10 commercial flywheel units which are expected to be commercially deployed in a one-megawatt system in April, 2008. At September 30, 2007, we
had firm, non-cancelable purchase commitments with our suppliers to acquire components for these commercial units, complete the build-out of the Tyngsboro facility, and to
satisfy contractual obligations for our research and development programs in the amount of approximately $3.6 million.

Legal Proceedings

We may from time to time be subject to legal proceedings, often likely to involve routine litigation incidental to our business. The outcome of any legal
proceeding is not within our complete control, may often be difficult to predict and may be resolved over very long periods of time. Estimating probable losses associated with any legal proceedings or
other loss contingency is very complex and requires the analysis of many factors including assumptions about potential actions by third parties. A loss contingency is recorded as a liability in the
consolidated financial statements when it is both (i) probable and known that a liability has been incurred and (ii) the amount of the loss is reasonably estimable. If the reasonable
estimate of the loss is a range and no amount within the range is a better estimate, the minimum amount of the range is recorded as a liability. If a loss contingency is not probable or not reasonably
estimable, a liability is not recorded in the consolidated financial statements.

On
October 9, 2007, Arete Power, Inc. filed a complaint against the Company, claiming damages from alleged willful infringement of U.S. Patent No. 6,710,489,
entitled "Axially Free Flywheel System." An answer to the complaint is presently due by the end of 2007. No discovery has been exchanged or conducted. An initial case management conference has been
tentatively scheduled for January 15, 2008. We believe that this lawsuit is without merit and we plan to vigorously defend the Company against the lawsuit.

11

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Note 6. Restructuring and Asset Impairment Charges

We periodically evaluate all of our property and equipment as required by Statement of Financial Accounting Standards No. 144 "Accounting for the
Impairment or Disposal of Long-Lived Assets." In 2002, we incurred a restructuring and impairment charge of $6.5 million of which $4.3 million represented impaired capital
equipment and leasehold improvements, $0.3 million related to severance costs and $1.9 million related to a reserve against future lease payments and related facility costs. The reserve
against future lease payments is classified as "Restructuring Reserve" in the current liabilities section of the balance sheet.

At
September 30, 2007 and December 31, 2006, the restructuring reserves were as follows:

|                       |  | Nine months ended
September 30,
2007 |          | Twelve months ended
December 31,
2006 |  
|---------------------- |  | ------------------------------------ | -------- | ------------------------------------- | -
|Beginning balance      |  | $                                    | 347,408  |                                       | $
|Charges for the period |  |                                      |         |                                       |  
|Reductions             |  |                                      | (310,219 | )                                     |  
|                       |  |                                      |          |                                       |  
|Ending balance         |  | $                                    | 37,189   |                                       | $
|                       |  |                                      |          |                                       |  

Note 7. Stock Warrants

The following schedule shows warrants outstanding as of September 30, 2007:

|Description                                       |  | Grant Date |  | Expiration
Date |  | Strike Price |       | Issued and
Outstanding
|------------------------------------------------- |  | ---------- |  | --------------- |  | ------------ | ----- | ----------------------
|May 24, 2005 Financing                            |  | 5/24/2005  |  | 5/24/2010       |  | $            | 1.008 |                       
|November 8, 2005 Financing (Investors)            |  | 11/8/2005  |  | 5/9/2011        |  | $            | 1.99  |                       
|November 8, 2005 Financing (Placement Agents)     |  | 11/8/2005  |  | 11/8/2008       |  | $            | 2.21  |                       
|February 15, 2007 Shelf Issue                     |  | 2/15/2007  |  | 2/15/0012       |  | $            | 1.33  |                       
|GFI Tyngsboro Lease                               |  | 7/23/2007  |  | 7/22/2014       |  | $            | 1.77  |                       
|September 10, 2007 Shelf Issue (Investors)        |  | 9/10/2007  |  | 3/11/2013       |  | $            | 1.99  |                       
|September 10, 2007 Shelf Issue (Placement Agents) |  | 9/10/2007  |  | 3/11/2013       |  | $            | 1.99  |                       
|                                                  |  |            |  |                 |  |              |       |                       
|Total warrants outstanding                        |  |            |  |                 |  |              |       |                       
|                                                  |  |            |  |                 |  |              |       |                       

We
have outstanding several series of warrants to purchase our common stock. Holders of the warrants are not entitled to receive dividends, vote, receive notice of any
meetings of stockholders or otherwise have any right as stockholders with respect to their warrant shares.

May 2005 Financing Warrant

In connection with the investment by Perseus 2000 Expansion, L.L.C., we issued a warrant for 800,000 shares of our common stock at an exercise price of $1.008.

November 2005 Financing Warrants

As part of a financing transaction in November 2005, we issued warrants to purchase an aggregate of 2,960,527 shares of our common stock to ten "accredited
investors." Each warrant was exercisable for a period of five years and the per-share exercise price for the warrant shares was $2.21. The terms of these warrants included
anti-dilution provisions which required us to adjust the exercise price and the number of shares of our common stock to be issued upon exercise of the warrants under certain circumstances,
which include:



12

---





In
February 2007, we issued stock at a price per share below the $1.85 threshold noted above. Based on the warrants' anti-dilution provisions, the exercise price of
these warrants was adjusted from $2.21 to $1.99 and 327,294 additional warrants were issued to the investors. Warrants issued to the placement agent were not subject to adjustment.

February 2007 Shelf Warrants

In February 2007, we sold 11,814,687 units of the Company at a purchase price of $0.90 per unit. Each unit consisted of one share of our common stock, par
value $0.01 per share, and a warrant to purchase 0.5 shares of common stock at an exercise price of $1.33 per share, for a total of 6,261,786 warrants. These warrants become exercisable as of
August 16, 2007, and expire five years from date of issue. The units were issued pursuant to a prospectus supplement filed with the Securities and Exchange Commission in connection with our
registration statement on Form S-3 filed on September 1, 2006, which became effective on December 14, 2006. We filed a request with the Securities and Exchange
Commission on August 1, 2007 that this registration statement on Form S-3 be withdrawn and the unsold securities deregistered, and filed a new shelf registration statement on
Form S-3 for $50 million on August 6, 2007, which we amended on August 14, 2007 and became effective on August 15, 2007.

July 2007 Warrants

In July 2007 we entered into a lease for a new facility in Tyngsboro, MA. We agreed under the terms of the lease to issue to the landlord pursuant to an
exemption from registration under the Securities Act of 1933, as amended, a warrant exercisable for 500,000 shares of our common stock at an exercise price of $1.77 per share. This warrant became
exercisable as of July 23, 2007, may be exercised at any time over the term of the lease and expires on July 22, 2014. The warrant and the shares issuable upon exercise of the warrant
are restricted securities and may not be sold without registration under the Securities Act of 1933, as amended, and applicable state securities laws or an exemption there from.

September 2007 Shelf Warrants

In September 2007, we sold 5,102,041 units of the Company at a purchase price of $1.96 per unit. Each unit consisted of one share of our common stock, par
value $0.01 per share, and a warrant to purchase 1.2 shares of common stock at an exercise price of $1.99 per share, for a total of 6,122,449 warrants. In addition, 153,061 warrants were issued to the
placement agents at the same price per share. The warrants become exercisable as of March 11, 2008, and expire on March 11, 2013. The units were issued pursuant to a prospectus
supplement filed with the Securities and Exchange Commission in connection with our registration statement on Form S-3 for $50 million filed on August 6, 2007, which
we amended on August 14, 2007 and became effective on August 15, 2007.

October 2007 Shelf Warrants

Subsequent to the end of the quarter, we sold 11,911,852 units of the Company at a purchase price of $2.09875 per unit. Each unit consisted of one share of our
common stock and one warrant to purchase .95 shares of our common stock at an exercise price of $2.97 per share. See Subsequent Event footnote for more details.

13

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Note 8. Stock-Based Compensation

Description of Plans

Stock Option Plan

Our Third Amended and Restated 1998 Stock Incentive Plan allows for the granting of stock options to purchase up to 23,000,000 shares of our common stock. Options
may be granted to our employees, officers, directors, consultants and advisors. Under the terms of the option plan, incentive stock options ("ISOs") are to be granted at the fair market value of our
common stock at the date of grant, and nonqualified stock options ("NSOs") are to be granted at a price determined by the Board of Directors. In general, the Board has authorized vesting periods of
one to three years and terms of varying length but in no case more than 10 years. Our stock option program is a long-term retention program that is intended to attract, retain and
provide incentives for talented employees, officers and directors, and to align stockholder and employee interests. We consider our option program critical to our operation and productivity;
essentially all of our employees participate. At September 30, 2007, we had 8,459,548 shares reserved for issuance under this plan, excluding shares currently reserved for outstanding options
and RSUs.

Employee Stock Purchase Plan

Our Employee Stock Purchase Plan (the "ESPP") allows substantially all of our employees to purchase shares of our common stock at a discount through payroll
deductions. Participating employees may purchase our common stock at a purchase price equal to 85% of the lower of the fair market value of the common stock at the beginning of an offering period or
on the exercise date. Employees may designate up to 15% of their base compensation for the purchase of common stock under this plan. The ESPP provides for the purchase of up to 2,000,000 shares of our
common stock. At September 30, 2007, we had 1,850,354 shares reserved for issuance under this plan.

Restricted Stock Unit Arrangements

Our Third Amended and Restated 1998 Stock Incentive Plan permits the grant of restricted stock units ("RSUs") to our employees, officers, directors and other
service providers. We use RSUs to (i) align our employees' interests with those of the Company, (ii) motivate our employees to achieve key product development milestones and thus create
stockholder value, (iii) retain key employees by providing equity to such employees and (iv) conserve cash, by paying bonuses in the form of RSUs, rather than in cash, but with the
number of such RSUs calculated on a discounted basis to compensate for the reduced liquidity as compared to cash. With respect to the RSUs that are granted in lieu of cash bonuses, the number of RSUs
granted are based on performance, and are automatically converted into shares of common stock in four equal tranches in the fiscal year following the year of performance. Certain other RSUs are
granted to our officers as a form of equity incentive, are not tied to performance, and vest over a three-year period in equal quarterly installments. There are also other
performance-based restricted stock units (PSUs) granted to our officers that cliff-vest upon the achievement of certain earnings-based milestones and upon the Company achieving a level of
revenue such that it is no longer treated as a development stage company for accounting purposes, both such vesting events subject to the recipient officer being employed by us during the period
ending with the milestones. The unvested portion of any RSU or PSU grant is subject to forfeiture upon the holder's resignation or termination for cause.

14

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Restricted
stock activity for the year ended December 31, 2006, and for the nine months ended September 30, 2007, is as follows:

|                                                    |  | Nine months ended
September 30,
2007 |  | Year ended
December 31,
2006 |  | Year ended
December 31,
2005
|--------------------------------------------------- |  | ------------------------------------ |  | ---------------------------- |  | ----------------------------
|
|Shares issued related to vested RSUs:               |  |                                      |  |                              |  |                             
|Current year grant based upon prior year bonus plan |  |                                     |  | 587,374                      |  | 593,080                     
|Based on prior year grants                          |  | 10,533                               |  | 108,786                      |  |                            
|Based upon current year executive officer agreement |  | 12,020                               |  | 10,533                       |  |                            
|Vested RSUs not yet converted to stock              |  | 9,521                                |  | 3,511                        |  |                            
|RSU's granted but not vested:                       |  |                                      |  |                              |  |                             
|Based upon prior year bonus plan                    |  |                                     |  |                             |  | 108,756                     
|Related to 2006 executive officer agreement         |  | 17,564                               |  | 28,097                       |  |                            
|Related to 2007 executive officer agreement         |  | 54,118                               |  |                             |  |                            
|Related to performance-based executive plan*        |  | 1,265,823                            |  | 1,265,823                    |  |                            

---

*Subject
to achievement of performance requirements.

Stock Option Plan Schedules

Stock option activity for the first nine months of 2007 was as follows:

|                                |  | Number of
Shares |   | Weighted-
Average
Exercise
Price |      | Weighted-
Average
Fair
Value
|------------------------------- |  | ---------------- | - | -------------------------------- | ---- | ----------------------------
|Outstanding, December 31, 2006  |  | 6,546,886        |   | $                                | 1.23 |                             
|Granted                         |  | 2,342,408        |   | $                                | 1.02 |                             
|Exercised                       |  | (47,747          | ) | $                                | 0.91 |                             
|Canceled, forfeited or expired  |  | (85,197          | ) | $                                | 1.40 |                             
|                                |  |                  |   |                                  |      |                             
|Outstanding, September 30, 2007 |  | 8,756,350        |   | $                                | 1.18 |                             
|                                |  |                  |   |                                  |      |                             

The
following table summarizes information about stock options outstanding at September 30, 2007:

|Exercise Price |  | Number
of Options
Outstanding |  | Weighted-
Average
Remaining
Contractual
Life (Years) |  | Weighted-
Average
Exercise
Price |      | Vested
Number
of Options |           | Vested
Weighted-
Average
Exercise
Price
|-------------- |  | ----------------------------- |  | ---------------------------------------------------- |  | -------------------------------- | ---- | ------------------------ | --------- | ---------------------------------------
|$0.26$0.74    |  | 3,206,638                     |  | 6.78                                                 |  | $                                | 0.70 |                          | 3,206,638 |                                        
|$0.82$1.26    |  | 3,615,927                     |  | 7.50                                                 |  | $                                | 0.93 |                          | 1,940,853 |                                        
|$1.51$2.19    |  | 1,476,535                     |  | 7.93                                                 |  | $                                | 1.83 |                          | 914,504   |                                        
|$2.50$3.10    |  | 130,000                       |  | 2.60                                                 |  | $                                | 2.64 |                          | 130,000   |                                        
|$4.10$5.27    |  | 222,250                       |  | 3.41                                                 |  | $                                | 4.40 |                          | 222,250   |                                        
|$6.00$9.31    |  | 105,000                       |  | 3.06                                                 |  | $                                | 6.40 |                          | 105,000   |                                        
|               |  |                               |  |                                                      |  |                                  |      |                          |           |                                        
|Total          |  | 8,756,350                     |  |                                                      |  |                                  |      |                          | 6,519,245 |                                        
|               |  |                               |  |                                                      |  |                                  |      |                          |           |                                        

15

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Stock Compensation

Beginning on January 1, 2006, we adopted SFAS 123R. See Note 2 for a description of our adoption of SFAS 123R. We currently use the
Black-Scholes option pricing model to determine the fair value of stock options and employee stock purchase plan shares. The valuations determined using this model are affected by our stock price as
well as assumptions we make regarding a number of complex and subjective variables, including our stock price volatility, expected life of the option, risk-free interest rate and expected
dividends, if any.

We
estimate the volatility of our common stock by using historical volatility. We estimate the expected term of the share or option grant, and determine a risk-free interest
rate based on U.S. Treasury issues with remaining terms similar to the expected term of the stock or options. We do not anticipate paying any cash dividends in the foreseeable future and therefore use
an expected dividend yield of zero in our valuation model. We are required to estimate forfeitures at the time of grant and revise those estimates in subsequent periods. All stock-based payment awards
are amortized as they are earned over the requisite service periods of the awards, which are generally the vesting periods.

Restricted
stock units (RSUs) are valued at the stock price at date of grant, and expensed ratably over the performance period or vesting period, as appropriate. The number of PSUs for
which stock compensation expense is calculated is based upon management's assessment of the likelihood of achieving the performance targets.

The
assumptions used to value stock option grants for the three and nine months ended September 30, 2007 and 2006, respectively, are as follows:

|                                                                                        |  | Three months ended September 30, |   | Nine months ended September 30, |  
|--------------------------------------------------------------------------------------- |  | -------------------------------- | - | ------------------------------- | -
|
|Risk-free interest rate                                                                 |  | 4.14%5.02                       | % | 4.79%5.13                      | %
|Expected life of option                                                                 |  | 3 years                          |   | 3 years                         |  
|Expected dividend payment rate, as a percentage of the stock price on the date of grant |  | 0                                | % | 0                               | %
|Assumed volatility                                                                      |  | 90%101                          | % | 106%129                        | %
|Expected forfeitures                                                                    |  | 10                               | % | 10                              | %

Stock-based
compensation expense recognized on our consolidated statement of operations for the three and nine months ended September 30, 2007, and 2006 are as follows:

|                                          |                                                                          | Three months ended September 30, |         | Nine months ended September 30,
|----------------------------------------- | ------------------------------------------------------------------------ | -------------------------------- | ------- | -------------------------------
|
|Selling, general and administrative       |                                                                          | $                                | 270,715 |                                
|Research and development                  |                                                                          |                                  | 143,355 |                                
|                                          |                                                                          |                                  |         |                                
|Total stock compensation expense          |                                                                          | $                                | 414,070 |                                
|                                          |                                                                          |                                  |         |                                
|Components of stock compensation expense: |                                                                          |                                  |         |                                
|                                          | Amortization of deferred compensation from restricted stock units (RSUs) |                                  | $       |                               
|                                          | Compensation expense related to other RSUs                               |                                  |         | 148,496                        
|                                          | Compensation expense related to stock options                            |                                  |         | 265,574                        
|                                          |                                                                          |                                  |         |                                
|Total stock compensation expense          |                                                                          | $                                | 414,070 |                                
|                                          |                                                                          |                                  |         |                                

16

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As
of September 30, 2007, there was approximately $2,054,011 of unrecognized compensation cost, adjusted for estimated forfeitures, related to unvested stock-based payments
granted to our employees and directors. Total unrecognized compensation cost will be adjusted for future changes in estimated forfeitures and recognized over the remaining vesting periods of the stock
option grants.

Note 9. Subsequent Events

On October 5, 2007, we announced that we had been notified by the U.S. Department of Energy that we could submit a full application for a DOE program that
would provide loan guarantees to commercial lenders for up to 80% of the project debt needed to finance the construction of our first 20-megawatt flywheel frequency regulation plant. We
were one of only 16 companies selected from a total of 143 that filed "pre-applications" for loan guarantees, and the only company whose project was chosen in the "Electricity
Delivery and Energy Reliability" category. We have not yet submitted the full application for these loan guarantees, and there is no assurance that we will receive any loan guarantees.

On
October 9, 2007, Arete Power, Inc. filed a complaint against the Company claiming damages from alleged willful infringement of U.S. Patent No. 6,710,489, entitled
"Axially Free Flywheel System." An answer to the complaint is presently due by the end of 2007. No discovery has been exchanged or conducted. An initial case management conference has been tentatively
scheduled for January 15, 2008. We believe that this lawsuit is without merit, and we plan to vigorously defend the Company against the lawsuit.

On
October 24, 2007, the Company entered into Amendment No. 3 (the "Amendment") to the Rights Agreement, dated as of September 25, 2002, between the Company and
Computershare Trust Company, N.A. (fka Equiserve Trust Company, N.A.), as Rights Agent, as previously amended by Amendment No. 1 dated as of December 27, 2002 and Amendment No. 2
dated as of August 8, 2007 (as amended, the "Rights Agreement"). The Amendment allows The Quercus Trust and persons who are beneficial owners through it to have a beneficial ownership
percentage of up to 20% of the Company's Common Stock without triggering the rights under the Rights Agreement. The Amendment also excludes from the beneficial ownership computations used to determine
whether a person has become an Acquiring Person (as defined in the Rights Agreement) those securities that might otherwise be acquired by exercising a warrant but for a limitation in such warrant or
elsewhere that prevents such exercise to the extent it would cause such person to become an Acquiring Person.

On
October 31, 2007, we sold 11,911,852 units of the Company at a purchase price of $2.09875 per unit for a total of approximately $23.8 million, net of expenses . Each
unit consisted of one share of our common stock, par value $0.01 per share, and a warrant to purchase 0.95 shares of common stock at an exercise price of $2.97 per share, for a total of 11,316,260
warrants. The warrants become exercisable six months and one day after their issuance, and expire five and one half years after their issuance. The units were issued pursuant to a prospectus
supplement filed with the Securities and Exchange Commission in connection with our registration statement on Form S-3 for $50 million filed on August 6, 2007, which
we amended on August 14, 2007 and became effective on August 15, 2007.

17

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Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations

Note Regarding Forward Looking Statements:

This Quarterly Report on Form 10-Q contains forward-looking statements concerning, among other things, our expected future revenues, operations
and expenditures, and estimates of the potential markets for our products and services. Such statements made may fall within the meaning of the Private Securities Litigation Reform Act of 1995, as
amended. All such forward-looking statements are necessarily only estimates of future results and the actual results we achieve may differ materially from these projections due to a number of factors
as discussed in the section entitled "Risk Factors" of this Form 10-Q. New risks can arise and it is not possible for management to predict all such risks, nor can management assess
the impact of all such risks on our business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking
statement. Given these risks and uncertainties, investors should not place undue reliance on forward-looking statements as a prediction of actual results. All forward-looking statements speak only as
of the date of this Quarterly Report on Form 10-Q. We undertake no obligation to revise or update publicly any forward-looking statement in order to reflect any event or
circumstance that may arise after the date of this Quarterly Report on Form 10-Q, other than as required by law.

Critical Accounting Policies and Estimates

The preparation of financial statements requires management to make estimates and judgments that may significantly affect the reported amounts of assets,
liabilities, revenues, expenses and related disclosures. On an ongoing basis, management evaluates our estimates and assumptions including, but not limited to, those related to revenue recognition,
asset impairments, inventory valuation, warranty reserves and other assets and liabilities. Management bases its estimates on historical experience and various other assumptions that it believes to be
reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources.
Actual results may differ from these estimates under different assumptions or conditions.

Revenue Recognition

Although we have shipped products and recorded contract revenues, our operations have not yet reached a level that would qualify us to emerge from the development
stage. Therefore we continue to be accounted for as a development stage company under Statement of Financial Accounting Standards No. 7 "Accounting and Reporting by Development Stage
Enterprises."

We
recognize revenue in accordance with accounting principles generally accepted in the United States of America. Generally, revenue is recognized on transfer of title, typically when
products are shipped and all related costs are estimable. For sales to distributors, we make an adjustment to defer revenue until our products are subsequently sold by distributors to their customers.

Research and Development Contract Revenue Recognized on the Percentage-of-Completion Method

We recognize contract revenue using the percentage-of-completion method, based primarily on labor hours incurred to date compared with
total estimated direct labor hours. Changes to total estimated contract costs or losses, if any, are recognized in the period in which they are determined. Revenues recognized in excess of amounts
billed are classified as current assets, and included in "Unbilled costs on contracts in process" in our balance sheets. Amounts billed to clients in excess of revenues recognized to date are
classified as current liabilities under "Advance billings on contracts." Changes in project performance and conditions, estimated profitability, and final contract settlements may result in future
revisions to construction contract costs and revenue.

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All
of our research and development contracts are subject to cost review by government agencies. Our reported results from these contracts could change adversely as a result of these
reviews.

Loss on Contract Commitments

Each quarter, we perform an evaluation of expected costs to complete our in-progress contracts that we account for using the
percentage-of-completion method. In the event that the total expected cost to complete a contract exceeds the expected total contract revenue, we immediately record a loss on
the contract to the extent that the expected cost exceeds the expected revenue from the contract.

Warranty Reserves

Our warranties require us to repair or replace defective products returned to us during the applicable warranty period at no cost to the customer. We record an
estimate for warranty-related costs based on actual historical return rates, anticipated return rates and repair costs at the time of sale. A significant increase in product return rates, or a
significant increase in the costs to repair products, could have an adverse impact on future operating results for the period or periods in which such returns or additional costs materialize and
thereafter.

Income Taxes

Deferred tax assets and liabilities are determined based on differences between the financial reporting and income tax basis of assets and liabilities as well as
net operating loss and tax credit carryforwards, and are measured using the enacted tax rates and laws that will be in effect when the differences reverse. Deferred tax assets are reduced by a 100%
valuation allowance to reflect the uncertainty associated with their ultimate realization.

Significant
management judgment is required in determining the provision for income taxes, the deferred tax assets and liabilities and any valuation allowance recorded against deferred
tax assets. The valuation allowance is based on our estimates of taxable income and the period over which our deferred tax assets will be recoverable. In the event that actual results differ from
these estimates or we adjust these estimates in future periods, we may need to establish an additional valuation allowance or reduce our current valuation allowance, which could materially impact our
tax provision.

Long-Lived Assets

In accordance with Statement of Financial Accounting Standards No. 144 "Accounting for the Impairment or Disposal of Long-Lived Assets"
long-lived assets we hold and use are reviewed to determine whether any events or changes in circumstances indicate that the carrying value of the asset may not be recoverable. The
conditions to be considered include whether or not the asset is in service, has become obsolete, is damaged, or whether external market circumstances indicate that the carrying amount may not be
recoverable. When appropriate we recognize a loss for the difference between the estimated fair value of the asset and the carrying amount. The fair value of the asset is measured using either
available market prices or estimated discounted cash flows.

19

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Sarbanes-Oxley Compliance

Companies that are considered "accelerated filers" as defined in Exchange Act Rule 12b-2 were required to comply with the provisions of
Section 404 of the Sarbanes-Oxley Act of 2002 (SOX) as of the first fiscal year ending on or after November 15, 2004. Non-accelerated and foreign private issuers must comply
with SOX by the first fiscal year ending on or after December 15, 2007. Based on our market capitalization as of June 30, 2006, we were considered a "small business issuer" and hence are
considered to be a "non-accelerated filer" with respect to our quarterly filings during 2007. However, as of June 30, 2007 our market capitalization exceeded $75 million, and
we will become an accelerated filer effective with our annual report on Form 10-K for 2007. We have begun activities aimed at complying with the requirements of Sarbanes-Oxley for
our current fiscal year.

Recently Issued Accounting Pronouncements and Regulations

None.

Overview

We design, develop, configure and expect to begin offering for sale, advanced products and services to support more reliable and cost-effective
electricity grid operation. The focus of our research and development has been to establish commercially viable flywheel-based energy storage technologies that can provide highly reliable energy
solutions for the worldwide electricity grid at competitive costs. Initially, we expect to generate revenues from the commercialization of our flywheel energy storage systems to supply frequency
regulation services to the electricity grid in North America. We believe that as we expand our production capabilities we can become a provider of frequency regulation services to grid operators on a
global basis. In addition, we believe that as the commercialization of our technologies continues we will develop other cost-effective applications for our flywheel systems that will
provide additional revenue opportunities.

Our
immediate market focus will be on the geographic regions of the domestic grid that have been deregulated. These regions and their Independent System Operator (ISO) designations are:
New England (ISO New England); California (California ISO); Texas (ERCOT); New York (New York ISO); and the Mid-Atlantic (PJM Interconnection). These regional ISOs or grid operators
purchase frequency regulation services from independent providers in open bid markets that they manage and maintain. We are seeking to become one such provider. We believe our technology will offer
grid operators the benefits of greater reliability; faster response time; cleaner operation, including zero direct emissions of carbon dioxide, nitrogen oxide, sulfur dioxide and mercury; and lower
maintenance costs compared to conventional power generation facilities that also provide frequency regulation services. We believe that we will have lower operating costs and faster response times
than the majority of other entities that provide frequency regulation services, which we believe will allow us to have sufficient margins to make the company economically viable.

In
North America, the frequency regulation market in areas that are deregulated and accessible via open-bid market mechanisms was valued at over $650 million in 2006.
Based on global electrical production, we believe that the worldwide frequency regulation market is several times this amount. Under the open-bid market in the US, grid operators forecast
the need for frequency regulation as a percentage of expected power demand and approved suppliers submit bids for these services. Significant growth in the US open-bid market is expected
due to a combination of factors, including the expected expansion of open-bid regulation markets and increased market penetration of intermittent renewable resources, including wind and
solar.

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To
fully exploit this regulatory-driven open-bid market, we expect to design, build, own and operate a number of frequency regulation facilities. Our business model, which is
a sale-of-services model, is similar to that of independent power producers who also design, build, own and operate their own power plants. Each Smart Energy
Matrix frequency regulation facility will be up to 20 megawatts (MW) in size. A Smart Energy Matrix is a multi-flywheel energy storage system designed to provide reliable and
sustainable frequency regulation services for electricity grids. A Smart Energy Matrix can be scaled to any size to provide one or more megawatts of frequency regulation capacity. Smart
Energy Matrix frequency regulation plants that are 20 MW or less in size offer the advantage of being eligible to use fast-track interconnection regulations that allow plants
of this capacity or smaller to be approved more quickly in accordance with streamlined regulatory rules. However, for each plant location, we will need to complete the associated site acceptance
process, including securing all permits and licenses per local and national codes. A key benefit of our business model is that we begin to obtain revenues from the sale of services immediately upon
installation of each megawatt. Another key benefit of our business model is that we avoid the costs and lengthy procurement cycles typically associated with marketing capital equipment to the utility
sector.

The
key qualification for our participation in these markets is the ability to demonstrate that our technology can provide the required services within the rules determined by the grid
operators. To attain this qualification and accelerate market entry we installed scale-power prototypes in New York and California for formal field trials. Both trials have been successfully
concluded, and have resulted in certification or other approval to-date from ISOs in three regions: California ISO, New York ISO, and PJM Interconnection (Mid-Atlantic).

21

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During 2007, net of offering expenses, we have raised approximately $42.6 million as a result of three financings. Based on these financings we believe we have adequate cash to
fund operations into the fourth quarter of 2008. Estimated cash outlays to move operations to our new corporate location and to close out the lease on the Wilmington facility are expected to be
approximately $0.7 million. The net cash required for structural improvements at the Tyngsboro facility to support our office, research and development and manufacturing requirements is
expected to be approximately $5.0 million. In the short term, capital equipment of approximately $1.0 million will be required to meet our 2008 production schedule. Additional capital
expenditures will be required in the future to optimize the plant to maximum capacity. The amount and timing of these expenditures are dependent on the equipment needed to meet our production
schedules. Our business model is to maximize the use of project financing for the ongoing deployment of frequency regulation facilities. To the extent financing does not provide sufficient funding we
will seek to obtain additional equity investments as needed to cover expenses relating to continuing operations including ongoing research and development, ramping up our manufacturing and assembly
capacity, and building frequency regulation facilities.

We
expect to begin commercial production of our Smart Energy 25 flywheel, which is the core component of the Smart Energy Matrix system, in December, 2007 and put our first
megawatt of frequency regulation into service by the end of April, 2008.

As
our business develops, we may from time to time evaluate possible acquisitions of enterprises or technologies that we would consider synergistic from a market, technology or product
perspective.

From
inception through September 30, 2007, we have incurred losses of approximately $159 million. We expect to continue to incur losses as we expand our product development
and begin to increase our manufacturing and assembly capacity.

Revenues

We were awarded fixed price research and development contracts from government agencies and are pursuing similar contracts from other government agencies. We have
recognized revenues on our existing contracts using the percentage of completion method. In prior years, we placed development prototype flywheel systems in both New York and California, where they
successfully in demonstrated the feasibility of using our technology to provide frequency regulation services. To date we have not recognized commercial revenues from our frequency regulation product.
In addition, we continue to evaluate other markets for our flywheel systems for future revenue opportunities.

Cost of Goods Sold

Cost of goods sold on fixed price research and development contracts is predominantly being recorded on the percentage of completion method and consists of direct
labor and material, subcontracting, and associated overhead costs.

22

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Selling, General and Administrative Expenses

Our sales and marketing expenses consist primarily of compensation and benefits for sales and marketing personnel and related business development expenses. In
2006 we added a director of marketing and sales to investigate additional applications for our technologies. Although our year-to-date expenditures for selling, general and
administrative expenses for 2007 is approximately 17% lower than during the same period during 2006, due primarily to lower stock compensation expense as a result of fewer new hire option grants and a
lower stock price earlier in the fiscal year, a reduction in public company expenses, reduced use of subcontractors and consultants, and allocation of a portion of our general and administrative
expenses to our Sandia contract, we expect sales and marketing expenses for the fourth quarter to increase as we expand efforts to define new markets for our products. We continue to rely on our
engineering personnel to provide technical specifications and product overviews to our potential customer base. General and administrative expenses consist primarily of compensation and benefits
related to our corporate staff, professional fees, insurance and travel. We expect our selling, general and administrative expenses to increase slightly during the fourth quarter of 2007, as compared
to the fourth quarter of 2006, due primarily to the implementation and reporting expenses associated with compliance with the internal control provisions of the Sarbanes-Oxley Act of 2002, fundraising
activities, and marketing, sales and business development expenses related to the Smart Energy Matrix.

Research and Development

Our cost of research and development consists primarily of the cost of compensation and benefits for research and development and support staff, as well as
materials and supplies used in the engineering design and development process. Our research and development costs for the first three quarters of 2007 were approximately 58% higher than during the
same period in 2006, due to increased engineering headcount to support development and testing as well as material used to develop and test our Smart Energy 25 flywheel system.

These
costs will continue to increase during the fourth quarter of 2007 as compared to the fourth quarter of 2006 as we complete the transition to our new facility in Tyngsboro, MA, and
begin commercial production activities aimed at implementing our first frequency regulation facility.

Loss on Contract Commitments

We will establish reserves for anticipated losses on contract commitments if, based on cost estimates to complete the commitment, we determine that a loss will be
incurred. We evaluate our estimated costs to complete our government contracts on a quarterly basis, and establish or adjust our reserves when appropriate. We are most likely to recognize probable
losses on contract commitments early in a product's introduction prior to being able to realize expected decreases in cost per unit through engineering design changes, operating efficiencies, and
volume purchasing discounts. We recorded a $1.4 million charge in 2006 for anticipated losses on our research and development contracts. During the three- and nine-month periods
ended September 30, 2007, we recorded a reduction to the losses on contract commitments of approximately $434,000, of which approximately $321,000 was based on our evaluation of our estimated
costs to complete government contracts, and approximately $113,000 was due to an adjustment of overhead charged to these contracts based on the difference between forecasted and actual overhead rates.

23

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Depreciation and Amortization

Our depreciation and amortization is primarily related to depreciation on capital expenditures and the amortization of lease and leasehold costs related to our
facilities. We have intellectual property in the form of patents on our flywheel vacuum system, our heat pipe cooling systems, DC output paralleling, metal hub, low-loss motor,
co-mingled rims and earthquake-tolerant bearings on our flywheel products, and anti-islanding software, drawings, source code, and production know-how on our Smart
Power M5 inverter system, and expect to obtain other patents during 2007 and beyond. Costs related to patent development were being amortized during 2004, but we recorded impairment charges to write
down these assets to zero on the balance sheet at December 31, 2004. These impairment charges were made due to the uncertainty of realizing any future value from this property mainly due the
lack of substantial revenues to date. Accordingly, all costs incurred during 2007 and 2006 related to the development of intellectual property have been expensed as incurred.

Interest and Other Income/Expense, net

Our non-operating income and expenses are primarily attributable to interest income resulting from cash on hand and gains or losses on the sale of our
impaired assets.

Results of Operations

Comparison of Three and Nine Months ended September 30, 2007 and 2006

|                                       |  | Three months ended September 30, |       
|-------------------------------------- |  | -------------------------------- | ------
|
|
|Revenue                                |  | $                                | 373   
|Cost of goods sold                     |  |                                  | 352   
|                                       |  |                                  |       
|Gross margin                           |  |                                  | 21    
|Selling, general and administrative    |  |                                  | 1,388 
|Research and development               |  |                                  | 1,978 
|Loss on sales and contract commitments |  |                                  | (434  
|Depreciation and amortization          |  |                                  | 43    
|Casualty loss (recovery)               |  |                                  | (9    
|Interest and other income, net         |  |                                  | 131   
|                                       |  |                                  |       
|Net loss                               |  | $                                | (2,814
|                                       |  |                                  |       

|                                         |  | Nine months ended September 30, |       
|---------------------------------------- |  | ------------------------------- | ------
|
|
|Revenue                                  |  | $                               | 1,215 
|Cost of goods sold                       |  |                                 | 1,163 
|                                         |  |                                 |       
|Gross margin                             |  |                                 | 52    
|Selling, general and administrative      |  |                                 | 4,352 
|Research and development                 |  |                                 | 5,462 
|Loss on contract commitments             |  |                                 | (434  
|Depreciation and amortization            |  |                                 | 99    
|Casualty loss (recovery)                 |  |                                 | (69   
|Interest and other income (expense), net |  |                                 | 388   
|                                         |  |                                 |       
|Net loss                                 |  | $                               | (8,970
|                                         |  |                                 |       

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Revenue

The following table provides details of our revenues for the three and nine months ended September 30, 2007 and 2006:

|                              |  |    |   | Three months ended
September 30, |     | Nine months ended
September 30, |   |     |  |  
|----------------------------- |  | -- | - | -------------------------------- | --- | ------------------------------- | - | --- |  | -
|
|
|
|
|CEC                           |  | 99 | % | $                                | 1   |                                 | $ | 47  |  | $
|NYSERDA PON 846               |  | 98 | % |                                  |    |                                 |   | 19  |  |  
|NYSERDA PON 800               |  | 82 | % |                                  |    |                                 |   | 6   |  |  
|Air Force Research Laboratory |  | 99 | % |                                  | 41  |                                 |   | 129 |  |  
|Sandia DOE Earmark            |  | 84 | % |                                  | 310 |                                 |   | 25  |  |  
|                              |  |    |   |                                  |     |                                 |   |     |  |  
|Total Contract Revenue        |  |    |   | $                                | 352 |                                 | $ | 226 |  | $
|M5 and accessories            |  |    |   |                                  | 21  |                                 |   | 51  |  |  
|                              |  |    |   |                                  |     |                                 |   |     |  |  
|Total                         |  |    |   | $                                | 373 |                                 | $ | 277 |  | $
|                              |  |    |   |                                  |     |                                 |   |     |  |  

In
the three-month period ended September 30, 2007, we recorded revenue from flywheel-related research and development contracts calculated using the percentage of completion
method of approximately $352,000, and approximately $21,000 from the sale of our Smart Power M5 inverter systems and related solar products. In the same period for 2006, we recorded
research and development contract revenue of approximately $226,000 and approximately $51,000 from the sale of our inverter systems and solar products. Contract revenue was higher for the third
quarter of 2007 compared to same period of 2006 by approximately $126,000 or 56%. Contract revenue during the third quarter of 2007 was lower on the CEC, NYSERDA and Air Force Research Laboratory
contracts than during the same period of 2006 by approximately $159,000, since the majority of the milestones on those contracts had been reached in earlier periods. However, this decrease and the
decrease in inverter revenue of approximately $30,000 were more than offset by the revenue increase on our Sandia DOE contract of approximately $285,000 which was awarded to us during the third
quarter of 2006.

In
the nine months ended September 30, 2007, we recorded revenue from flywheel-related research and development contracts calculated using the percentage of completion method of
approximately $1,165,000 and approximately $50,000 from the sale of our Smart Power M5 inverter systems and related solar products. In the same period for 2006, we recorded research and
development contract revenue of approximately $660,000 and approximately $115,000 from the sale of our inverter systems and solar products. Contract revenue was higher for the first nine months of
2007 compared to same period of 2006 by approximately $505,000 or 77%. Contract revenue during the first nine months of 2007 was lower on the CEC and NYSERDA contracts than during the same period of
2006 by approximately $307,000, since the majority of the milestones on those contracts had been reached in earlier periods. However, this decrease and the decrease in inverter revenue of
approximately $65,000 were more than offset by revenue increases on our Air Force Research Laboratory contract of approximately $280,000 and additional revenue of approximately $532,000 on the Sandia
DOE contract which was awarded to us during the third quarter of 2006.

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Cost of Goods Sold

Cost of goods sold for the three-month periods ended September 30, 2007, and 2006, were approximately $352,000 and $238,000, respectively, and include
primarily costs incurred in performance of our research and development contracts calculated using the percentage of completion method. Cost of goods sold for the three-month period ended
September 30, 2007, increased approximately $114,000 over the corresponding three-month period in 2006. The increases are consistent with the increases in contract revenue based on the
percentage of completion accounting methodology. Cost of goods sold for the nine-month periods ended September 30, 2007, and 2006, were approximately $1,163,000 and $689,000,
respectively, and include primarily costs incurred in performance of our research and development contracts calculated using the percentage of completion method. Cost of goods sold for the
nine-month period ended September 30, 2007, increased approximately $474,000, or 69%, over the corresponding nine-month period in 2006. The increases are consistent with
the increases in contract revenue based on the percentage of completion accounting methodology.

Selling, General and Administrative Expense

The following details the key changes in our Selling, General and Administrative expenses for the three- and nine-month periods ended
September 30, 2007, in comparison to the equivalent periods during the prior year:

|                                |                                     | Three months ended
September 30, |       | Nine months ended
September 30, |  
|------------------------------- | ----------------------------------- | -------------------------------- | ----- | ------------------------------- | -
|
|Period Ended September 30, 2006 |                                     | $                                | 1,716 |                                 | $
|Increases (decreases):          |                                     |                                  |       |                                 |  
|                                | Stock compensation expense          |                                  |       | (86                             | )
|                                | Public company expenses             |                                  |       | (112                            | )
|                                | Subcontractors and consultants      |                                  |       | (117                            | )
|                                | Allocation of overhead to contracts |                                  |       | (183                            | )
|                                | Facility costs                      |                                  |       | 24                              |  
|                                | Audit fees                          |                                  |       | 39                              |  
|                                | Other                               |                                  |       | (20                             | )
|                                | Office equipment upgrades           |                                  |       | (1                              | )
|                                | Travel                              |                                  |       | 29                              |  
|                                | Salaries and benefits               |                                  |       | 43                              |  
|                                | Legal and professional fees         |                                  |       | 56                              |  
|                                |                                     |                                  |       |                                 |  
|Period Ended September 30, 2007 |                                     | $                                | 1,388 |                                 | $
|                                |                                     |                                  |       |                                 |  

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Selling, general and administrative expenses totaled approximately $1,388,000 and $1,716,000 for the three months ended September 30, 2007, and 2006,
respectively. The reduction of approximately $328,000 or 19% was primarily the result of lower stock compensation of approximately $86,000 mainly due to a decrease in our share price, a reduction in
public company expenses of approximately $112,000, reduced usage of subcontractors and consultants of approximately $117,000, allocation of overhead to our Sandia contract of approximately $183,000
and other miscellaneous expense of approximately $21,000. These decreases were offset by an increase in legal and professional fees of approximately $56,000, headcount-related expense of approximately
$43,000, audit fees of approximately $39,000, travel expense of approximately $29,000 and facility costs of approximately $24,000 resulting from the transition to our new facility. We expect our
selling, general and administrative expenses for the fourth quarter of 2007 to be somewhat higher than during the third quarter of 2007 due primarily to costs related to transitioning to our new
facility in Tyngsboro, implementation and reporting expenses associated with compliance with the Sarbanes-Oxley Act of 2002, increased marketing and sales expenses associated with flywheel products
and fund-raising efforts.



Selling, general and administrative expenses totaled approximately $4,352,000 and $5,273,000 for the nine months ended September 30, 2007, and 2006,
respectively. The reduction of approximately $921,000 or 17% was primarily the result of lower stock compensation of approximately $368,000 mainly due to a decrease in our share price, a reduction in
public company expenses of approximately $216,000, a reduction in the usage of subcontractors and consultants of approximately $207,000, allocation of G&A overhead to our Sandia contract of
approximately $178,000, a reduction in audit fees of approximately $83,000, upgrades to office equipment expense during 2006 of approximately $33,000 and other various items of approximately $58,000.
These decreases were offset by an increase in legal and professional fees of approximately $99,000, headcount-related expense of approximately $69,000, travel expense of $28,000 and facility costs of
approximately $26,000. Overall, we expect our selling, general and administrative expenses for fiscal 2007 to be lower than in 2006, although costs may increase during the fourth quarter due primarily
to implementation and reporting expenses associated with compliance with the Sarbanes-Oxley Act of 2002, costs related to transitioning to our new facility in Tyngsboro, increased marketing and sales
expenses associated with flywheel products and fund-raising efforts.

27

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Research and Development Expense

The following details the key changes in our Research and Development expenses for the three- and nine-month periods ended September 30, 2007,
in comparison to the equivalent periods during the prior year:

|                                |                                     | Three months ended
September 30, |       | Nine months ended
September 30, |  
|------------------------------- | ----------------------------------- | -------------------------------- | ----- | ------------------------------- | -
|
|Period Ended September 30, 2006 |                                     | $                                | 1,314 |                                 | $
|                                | Increases (decreases):              |                                  |       |                                 |  
|                                | Salaries and benefits               |                                  |       | 348                             |  
|                                | Expense materials                   |                                  |       | (146                            | )
|                                | Consultants and subcontractors      |                                  |       | 40                              |  
|                                | Facility costs                      |                                  |       | 174                             |  
|                                | Legal                               |                                  |       | 43                              |  
|                                | Hiring expenses                     |                                  |       | (1                              | )
|                                | Outside testing                     |                                  |       | 18                              |  
|                                | Travel                              |                                  |       | 8                               |  
|                                | Allocation of overhead to contracts |                                  |       | 190                             |  
|                                | Other                               |                                  |       | 5                               |  
|                                | Stock compensation expense          |                                  |       | (15                             | )
|                                |                                     |                                  |       |                                 |  
|Period Ended September 30, 2007 |                                     | $                                | 1,978 |                                 | $
|                                |                                     |                                  |       |                                 |  



For the three months ended September 30, 2007, research and development expenses increased by approximately $664,000 or 51%, in comparison to the
equivalent period in 2006. This increase is primarily due to increased expenses for headcount-related expenses resulting from the hiring of engineering and operational personnel to support our
flywheel development and manufacturing of approximately $348,00, allocation of overhead to contacts of approximately $190,000, facility costs of approximately $174,000 (related to maintaining two
facilities during the transition period), legal expenses of approximately $43,000, usage of consultant of $40,0000, outside testing of approximately $18,000, travel expense of approximately $8,000 and
other research and related expenses of approximately $5,000 more than during the equivalent period in 2006. Since the primary development work on the Smart Energy 25 flywheel was completed during the
early portion of the third quarter, expense material costs dropped by approximately $146,000 over the equivalent period during 2006. Additionally, stock compensation expense was approximately $15,000
lower during the third quarter of 2007 than in the prior year. Option grants are typically made during the first quarter to existing employees, and to new hires. There were fewer new hires during the
third quarter of the current year than during the equivalent period in 2006. We expect research and development costs during the fourth quarter of 2007 to be higher than during the third quarter of
2007 due to the costs of moving to the Tyngsboro facility, and beginning commercial production of our flywheel systems.

28

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For the nine months ended September 30, 2007, research and development expenses increased by approximately $2,000,000 or 58%, in comparison to the
equivalent period in 2006. This increase is primarily due to increased expenses for headcount-related expenses resulting from the hiring of engineering personnel to support our flywheel development
and testing of approximately $1,007,000, expense materials of approximately $364,000, usage of consultants of approximately $316,000, increased facility costs of approximately $234,000 related to
operating facilities in Wilmington and Tyngsboro during the transition period, legal costs of approximately $49,000 related to patent activity, hiring expense of $41,000, outside testing of $26,000,
travel of $19,000 and allocation of overhead to contracts of approximately $6,000 more than during the equivalent period in 2006. These increases were partially offset by decreased stock compensation
expense of approximately $45,000 based on lower stock prices during much of the period, and other R&D-related expense of approximately $17,000, as compared to the equivalent period in
2006.

We
expect research and development costs during the fourth quarter of 2007 to continue at a rate that is substantially higher than the equivalent period during 2006, largely due to the
costs of moving to our new facility in Tyngsboro and beginning commercial production of our flywheel systems. Although critical testing of the Smart Energy 25 flywheel is complete, we continue to
perform various operational tests and other development work aimed at achieving manufacturing cost reductions.

Loss on Contract Commitments

We recorded contract commitment losses on our research and development contracts in 2005 of $1,535,000 based on expected cost overruns related to material, labor
and overhead, as well as unplanned overruns in the amount of labor required to complete the contracts. During the first nine months of 2006, we recorded additional charges totaling approximately
$997,000 to the contract loss reserve. This amount consisted of net increases in estimated material, labor, and travel costs expected to complete existing contracts of approximately $314,000;
increases in the labor and overhead rates applied to the contracts based on actual costs of approximately $368,000, and other costs of $45,000. Additionally, a loss of approximately $240,000 was
recorded in the third quarter of 2006 related to our expected cost share portion of the Sandia contract. At the end of our third quarter of 2007, most of the work on our government contracts was
substantially complete. During the three- and nine-month periods ended September 30, 2007, we recorded a reduction to the losses on contract commitments of approximately $434,000,
based on our evaluation of our remaining estimated costs to complete these contracts. This amount consisted of net decreases in estimated material, labor, overhead and travel costs expected to
complete existing contracts of approximately $321,000. In addition, since our actual overhead rate was lower than forecasted at the beginning of the fiscal year, we reduced the overhead applied to the
contracts and our contract loss reserve by an additional $113,000.

Depreciation and Amortization

The increase in depreciation expense for the first nine months of 2007 as compared to the first nine months of 2006 of approximately $26,000, or 36%, is primarily
attributable to depreciation on new assets acquired during 2007 and the latter half of 2006. Likewise, the increase in depreciation expense for the three months ended September 30, 2007, over
the comparable period in 2006 of approximately $19,000, or 79%, is also attributable to depreciation on new assets acquired during that period. We expect depreciation for the fourth quarter of 2007 to
be substantially higher than during the fourth quarter of 2006 primarily due to capital expenditures relating to leasehold improvements at the Company's new manufacturing and office facility in
Tyngsboro, as well as the purchase of machinery and equipment required to begin commercial production.

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Interest and Other Income/(Expense), net

Interest income for the quarter ended September 30, 2007, was approximately $9,000 greater than for the equivalent period in 2006. The primary reason for
this difference is that cash balances available for investing were on average higher than during the same period in the prior year, primarily as a result of the cash obtained through the sale of stock
and warrants at the beginning of the quarter in 2007. The increased interest income was offset by decreases in other income of approximately $7,000.

The
decrease in interest for the first nine months of 2007 as compared to the same period during 2006 of approximately $32,000, or 8%, is primarily attributable to lower cash balances
available for investing, particularly during the first half of the first quarter of the current fiscal year. As a result of our sales of stock during mid-February 2007 and early
September 2007, cash available for investing increased by approximately $19 million. Additionally, other income decreased by approximately $9,000, due primarily to a partial settlement
of a class action suit, relating to unfair practices engaged in by certain insurance brokerage firms received in 2006.

Net Loss

As a result of the changes discussed above, the net loss for the nine months ended September 30, 2007, was approximately $8,970,000, which compares to a
net loss during the same period in 2006 of approximately $9,259,000, a reduction in net loss of approximately $289,000, or 3%. The net loss for the three months ended September 30, 2007, was
approximately $351,000 lower than the net loss for the comparable period in 2006, a change of 11%. The reduction in the loss for both the quarter and the year-to-date period is
due primarily to the factors discussed above, particularly the reduction in contract loss recorded during the third quarter of 2007 and the decrease in Selling, General and Administrative expenses.
These reductions were partially offset by the increased spending on Research and Development.

Liquidity and Capital Resources

|                                          |                      | Nine months ended September 30, |       
|----------------------------------------- | -------------------- | ------------------------------- | ------
|
|
|Cash and cash equivalents                 |                      | $                               | 14,194
|Working capital                           |                      |                                 | 12,749
|Cash provided by (used in)                |                      |                                 |       
|                                          | Operating activities |                                 |       
|                                          | Investing activities |                                 |       
|                                          | Financing activities |                                 |       
|                                          |                      |                                 |       
|Net decrease in cash and cash equivalents |                      | $                               | 8,943 
|                                          |                      |                                 |       
|Current ratio                             |                      |                                 | 4.7   
|                                          |                      |                                 |       

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Our
cash requirements depend on many factors including, but not limited to, research and development activities, continued efforts to commercialize our products, facility costs as well
as general and administrative expenses. Since we are still in the development stage and have not yet begun our expected principal operations, we do not generate enough cash from operations to satisfy
our working capital requirements. We expect to make significant expenditures to fund our operations, develop technologies and explore opportunities to find and develop additional markets to sell our
products. As we prepared to begin commercial activity aimed at revenue generation during 2008, we increased our headcount and spent additional funds on development materials, capital equipment and
market analyses to understand the size of markets, competitive aspects and advantages that our products could provide. We expect to use more cash resources during the fourth quarter of 2007 as we
begin to manufacture our Smart Energy 25 flywheels in anticipation of putting a frequency regulation facility into service during the second quarter of 2008.

We
believe that the capital raised this year will provide sufficient funding for us to continue to implement our business plan into the fourth quarter of 2008. We will need to secure
project financing for the construction of our frequency regulation facilities, and if we are not able to obtain sufficient financing to continue to deploy regulation facilities we may need to raise
additional capital in 2008 and beyond. Our business model is to maximize the use of project financing for the ongoing deployment of frequency regulation facilities. To the extent financing does not
provide sufficient funding we will seek to obtain additional equity investments as needed to cover expenses relating to:



During
2007, net of offering expenses, we have raised approximately $42.6 million as a result of three financings. In the first quarter we raised $9.6 million through the
sale of our common stock in a private placement. In the third quarter we raised an additional $9.2 million through the sale of common stock and warrants pursuant to our shelf registration
statement. Subsequent to the end of the quarter we raised approximately an additional $23.8 million through the sale of common stock and warrants pursuant to our shelf registration statement.

We
expect to begin commercial production of our Smart Energy 25 flywheel, which is the core component of the Smart Energy Matrix system, in December, 2007 and put our first
megawatt of frequency regulation into service by the end of April, 2008.

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Operating Activities

Net cash used in operating activities was approximately $7,916,000 and $5,622,000 for the nine months ended September 30, 2007, and 2006, respectively. The
primary component to the negative cash flow from operations is from net losses. For the nine months ending September 30, 2007, we had a net loss of approximately $8,970,000. Adjustments to
reconcile net loss to cash flow in 2007 include non-cash stock compensation of approximately $1,451,000, depreciation and amortization of approximately $99,000, and a net reduction in the
asset impairment reserve of approximately $1,000, and changes in operating assets and liabilities of approximately $425,000 offset by deferred rent of approximately $611,000, a gain on the sale of
fixed assets of approximately $1,000 and facility-related cash payments charged against restructuring reserves of approximately $310,000. During the same period in 2006, we had a net loss of
approximately $9,259,000. Adjustments to reconcile net loss to cash flow include non-cash stock compensation of approximately $1,864,000, depreciation and amortization of approximately
$73,000, offset by facility-related cash payments charged against restructuring reserves of approximately $275,000. Changes in the operating assets and liabilities generated approximately $1,975,000
of cash during the first nine months of 2006.

Investing Activities

Net cash used in investing activities was approximately $2,760,000 for the nine months ending September 30, 2007, and $143,000 during the same period of
2006. The principal use of cash in 2007 for investing activities was the purchase of property and equipment in the amount of approximately $2,564,000, much of which relates to the renovation of the
Tyngsboro facility and an increase of restricted cash of approximately $200,000 related to the Tyngsboro property lease. These were offset by the sale of property and equipment of approximately
$4,000. The principal use of cash for investing activities during the first nine months of 2006 was the purchase of property and equipment in the amount of approximately $143,000.

Financing Activities

Net cash provided by financing activities was approximately $19,619,000 for the first nine months of 2007 and $39,000 during the same period of 2006. During the
first nine months of fiscal 2007, we raised approximately $18,849,000 from the sale of stock from our shelf registration statement, approximately $717,000 from the reduction in lease payments in
exchange for stock and warrants issued to the landlord, approximately $43,000 for the exercise of employee stock options and approximately $10,000 for the issuance of stock to our employees under the
employee stock purchase plan. During the equivalent period of 2006, we received approximately $10,000 from the issuance of stock under the employee stock purchase plan, and approximately $29,000 from
the exercise of employee stock options.

As
part of our new business development, we may evaluate possible acquisitions of enterprises or technologies that we consider synergistic from a market, technology or product
perspective. We may make investments in companies for strategic business reasons. Because our primary motivation in making these investments may not be to realize a profit on the investment itself,
but rather to expand our business prospects, these investments may lack any financial return to the Company, may result in a loss of principal and may lack liquidity.

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Item 3. Quantitative and Qualitative Disclosure about Market Risk

Our cash equivalents, which have maturities of less than three months, may expose our assets to interest rate risk. At September 30, 2007, we had
approximately $109,000 of cash equivalents that were held in non-interest bearing accounts, approximately $704,000 of cash equivalents that were held in interest-bearing checking accounts,
and approximately $13,381,000 invested in interest-bearing money market accounts at high-quality financial institutions, some of which are invested in off-shore securities. The
fair value of these investments approximates their cost. The funds invested in money market accounts may not be covered under FDIC Insurance, and therefore may be at some risk of loss, which we deem
to be low.

Item 4T. Controls and Procedures

Based on our market capitalization as of June 30, 2006, we were considered a "small business issuer" and hence are considered to be a
"non-accelerated filer" with respect to our quarterly filings during 2007. However, as of June 30, 2007, our market capitalization exceeded $75 million, and we will become an
accelerated filer effective with our annual report on Form 10-K for 2007. We have begun activities aimed at complying with the requirements of Sarbanes-Oxley for our current fiscal
year. To that end, we have engaged Control Solutions to assist us with updating our documentation, performing a risk assessment, and testing the effectiveness of our controls.

Our
management, with the participation of our principal executive officer and principal financial officer, has evaluated the effectiveness of our disclosure controls and procedures (as
defined in Rule 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended) as of the end of the period covered by this Quarterly Report on
Form 10-Q. Based on that evaluation, the principal executive officer and principal financial officer have concluded that our disclosure controls and procedures are effective in
enabling us to record, process, summarize and report information required to be included in our periodic SEC filings within the required time period. Management recognizes that any controls and
procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives, and management necessarily applies its judgment in evaluating the
cost-benefit relationship of possible controls and procedures. Based on the evaluation of our disclosure controls and procedures as of September 30, 2007, our principal executive
officer and principal financial officer concluded that, as of such date, our disclosure controls and procedures were effective at the reasonable assurance level.

In
addition, our management, with the participation of our principal executive officer and principal financial officer, has evaluated whether any change in our internal control over
financial reporting (as defined in Rule 13a-15(f) under the Securities Exchange Act of 1934) occurred during the period covered by this Quarterly Report on
Form 10-Q. Based on that evaluation, the principal executive officer and principal financial officer have concluded that there has been no change in our internal control over
financial reporting during the period covered by this Quarterly Report on Form 10-Q that has materially affected, or is reasonably likely to materially affect, our internal control
over financial reporting.

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Part IIOTHER INFORMATION

Item 1. Legal Proceedings

On October 9, 2007, Arete Power, Inc. filed a complaint against the Company claiming damages from alleged willful infringement of U.S. Patent
No. 6,710,489, entitled "Axially Free Flywheel System." An answer to the complaint is presently due by the end of 2007. No discovery has been exchanged or conducted. An initial case management
conference has been tentatively scheduled for January 15, 2008. We believe that this lawsuit is without merit, and we plan to vigorously defend the Company against the lawsuit.

Item 1A. Risk Factors

There have not been any material changes during the nine months ended September 30, 2007 to the risk factors set forth in Part I, Item IA of our
Annual Report on Form 10-K for the year ended December 31, 2006, and filed with the Securities and Exchange Commission on March 30, 2007, and amended on May 2,
2007, and in our quarterly report on Form 10-Q for the quarter ended June 30, 2007, filed with the SEC on August 8, 2007.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

None.

Item 3. Defaults Upon Senior Securities

None.

Item 4. Submission of Matters to a Vote of Security Holders

None

Item 5. Other Information

None.

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Item 6. Exhibits

|Exhibit
Number |  | Ref |   | Description of Document                                                                                                                              
|-------------- |  | --- | - | -----------------------------------------------------------------------------------------------------------------------------------------------------
|3.1            |  | (1  | ) | Sixth Amended and Restated Certificate of Incorporation.                                                                                             
|3.2            |  | (2  | ) | Amended and Restated Bylaws, as amended.                                                                                                             
|3.3            |  | (3  | ) | Certificate of Designation of Series A Junior Participating Preferred Stock, filed with The Secretary of State of Delaware on October 4, 2002.       
|4.1            |  | (4  | ) | Form of specimen stock certificate.                                                                                                                  
|4.2            |  | (5  | ) | Amendment No. 2 to Rights Agreement                                                                                                                  
|4.3            |  | (6  | ) | Amendment No. 3 to Rights Agreement                                                                                                                  
|10.1           |  | (7  | ) | Placement Agency agreement with Merriman Curhan & Company.                                                                                           
|10.2           |  | (8  | ) | Employment agreement dated March 2, 2007 between the Company and F. William Capp                                                                     
|10.3           |  | (8  | ) | Employment agreement dated March 2, 2007 between the Company and James M. Spiezio                                                                    
|10.4           |  | (8  | ) | Employment agreement dated March 2, 2007 between the Company and Matthew L. Lazarewicz                                                               
|10.5           |  | (8  | ) | Restricted Stock Unit and Option Agreement dated March 2, 2007 between the Company and F. William Capp.                                              
|10.6           |  | (8  | ) | Restricted Stock Unit and Option Agreement dated March 2, 2007 between the Company and James M. Spiezio.                                             
|10.7           |  | (8  | ) | Restricted Stock Unit and Option Agreement dated March 2, 2007 between the Company and Matthew L. Lazarewicz.                                        
|10.8           |  | (8  | ) | Option Agreement dated March 2, 2007 between the Company and F. William Capp.                                                                        
|10.9           |  | (8  | ) | Option Agreement dated March 2, 2007 between the Company and James M. Spiezio.                                                                       
|10.10          |  | (8  | ) | Option Agreement dated March 2, 2007 between the Company and Matthew L. Lazarewicz.                                                                  
|10.11          |  | (9  | ) | Lease dated as of July 23, 2007 between the Company and GFI Tyngsboro, LLC.                                                                          
|10.12          |  | (10 | ) | Sandia Labs Purchase Order                                                                                                                           
|31.1           |  | +   |   | Certification of Principal Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.                                              
|31.2           |  | +   |   | Certification of Principal Financial and Accounting Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.                               
|32.1           |  | +   |   | Certification of Principal Executive Officer pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
|32.2           |  | +   |   | Certification of Principal Financial Officer pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

---

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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
thereunto duly authorized.

|Date:  November 8, 2007 |  | BEACON POWER CORPORATION
|----------------------- |  | ------------------------
|                        |  | By:                     
|                        |  | By:                     

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