Forward-Looking Statement

You should read the following discussion and analysis in conjunction with our consolidated financial statements and notes in Item 1 of this report and with our audited consolidated financial statements and notes included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2008.

In addition to the historical information contained in this report, this report contains or incorporates by reference forward-looking statements within the meaning of section 27A of the Securities Act of 1933 and section 21E of the Securities Exchange Act of 1934. You can identify these forward-looking statements by our use of the words "believes," "anticipates," "plans," "expects," "may," "will," "intends," "estimates," and similar expressions, whether in the negative or in the affirmative. Such forward-looking statements includes those related to expected revenue growth, our ability to continue to make interest and principal payments on our Notes in shares of our common stock, our ability to achieve our business plan, and our ability to reduce costs in the future. Although we believe that these forward-looking statements reasonably reflect our plans, intentions and expectations, these forward-looking statements involve risks and uncertainties that could cause actual results to differ materially. We caution that these statements are qualified by various factors that may affect future results, including the following: business conditions within the distributed power, power quality, aerospace, transportation, industrial, utility, telecommunications, silicon wafer manufacturing, factory automation, aircraft and automotive industries and the world economies as a whole; technology developments and contract research and development for both the government and commercial sectors; the ability of our new products in penetrating the distributed power, power quality, aerospace, transportation, industrial, utility, telecommunications, silicon wafer manufacturing, factory automation, aircraft and automotive markets. This report should be read in conjunction with our Annual Report on Form 10-K for the fiscal year ended December 31, 2008, including particularly Part I, Item 1A, "Risk Factors."

Forward-looking statements contained in this Quarterly Report speak only as of the date of this report. Subsequent events or circumstances occurring after such date may render these statements incomplete or out of date. We undertake no obligation and express disclaim any duty to update such statements.

Overview (Executive Summary)

Satcon Technology Corporation ("Satcon" or "Company") is a leading clean energy technology provider of utility grade power solutions for the renewable and distributed energy markets. We deliver power conversion solutions and system design services for large-scale renewable energy plants. Our products are utilized by businesses and utility companies to efficiently convert renewable energy sources into stable and reliable electrical power.

Our PowerGateŽ Plus suite of photovoltaic and fuel cell power inverters, which are sold through the Company's Renewable Energy Solutions division, offer rugged and reliable solutions that enhance the total output and power production of the solar installation. We also offer system design services and solutions for management, monitoring, and performance measurement to maximize capital investment and improve overall quality and performance over the entire lifespan of the installation.

In addition to our core power conditioning solutions, we also develop, design and build power conversion electronics, power management and distribution systems for a variety of defense and commercial applications through our Applied Technology division.

Critical Accounting Policies and Significant Judgments and Estimates

Our discussion and analysis of our financial condition and results of our operations are based on our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States of America. The preparation of these consolidated financial statements requires management to make significant estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements and the reported revenue and expenses during the reporting periods. On an ongoing basis, management evaluates its estimates and

judgments, including those related to revenue recognition, receivable reserves, inventory reserves, goodwill and intangible assets, contract losses and income taxes. Management bases its estimates on historical experience and on various other factors that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions. Our critical accounting estimates were discussed with our Audit Committee. There have been no material changes from the "Critical Accounting Policies and Significant Judgments and Estimates" previously disclosed in Part II, Item 7, "Management's Discussion and Analysis of Financial Condition and Results of Operations" of our Annual Report on Form 10-K for the fiscal year ending December 31, 2008.

The significant accounting policies that management believes are most critical to aid in fully understanding and evaluating our reported financial results include the following:

Revenue Recognition

We recognize revenue from product sales in accordance with SEC Staff Accounting Bulletin No. 104, Revenue Recognition. Product revenue is recognized when there is persuasive evidence of an arrangement, the fee is fixed or determinable, delivery of the product to the customer has occurred and we have determined that collection of the fee is probable. Title to the product passes upon shipment of the product, as the products are typically shipped FOB shipping point, except for certain foreign shipments. If the product requires installation to be performed by us, all revenue related to the product is deferred and recognized upon the completion of the installation. If the product requires specific customer acceptance, revenue is deferred until customer acceptance occurs or the acceptance provisions lapse, unless we can objectively and reliably demonstrate that the criteria specified in the acceptance provisions are satisfied. When appropriate, we provide for a warranty reserve at the time the product revenue is recognized. If a contract involves the provisions of multiple elements and the elements qualify for separation, total estimated contact revenue is allocated to each element based on the relative fair value of each element provided. The amount of revenue allocated to each element is limited to the amount that is not contingent upon the delivery of another element in the future. Revenue is recognized on each element as described above.

We perform funded research and development and product development for commercial companies and government agencies under both cost reimbursement and fixed price contracts. Cost reimbursement contracts provide for the reimbursement of allowable costs and, in some situations, the payment of a fee. These contracts may contain incentive clauses providing for increases or decreases in the fee depending on how costs compare with a budget. On fixed price contracts, revenue is generally recognized on the percentage of completion method based upon the proportion of costs incurred to the total estimated costs for the contract. Revenue from reimbursement contracts is recognized as services are performed. In each type of contract, we receive periodic progress payments or payment upon reaching interim milestones and retain the rights to the intellectual property developed in government contracts. All payments to us for work performed on contracts with agencies of the U.S. government are subject to audit and adjustment by the Defense Contract Audit Agency. Adjustments are recognized in the period made. The Defense Contract Audit Agency has agreed-upon the final indirect cost rates for the fiscal year ended December 31, 2005. When the current estimates of total contract revenue and contract costs for product development contracts indicate a loss, a provision for the entire loss on the contract is recorded. As of October 3, 2009 and December 31, 2008, we have accrued approximately $0 and $1.1 million, respectively, for anticipated contract losses on commercial contracts.

Cost of product revenue includes material, labor and overhead. Costs incurred in connection with funded research and development and other revenue arrangements are included in funded research and development and other revenue expenses.

Deferred revenue consists of payments received from customers in advance of services performed, product shipped or installation completed.

Unbilled contract costs and fees represent revenue recognized in excess of amounts billed due to contractual provisions or deferred costs that have not yet been recognized as revenue or billed to the customer.

Accounts Receivable

Accounts receivable are reduced by an allowance for amounts that may become uncollectible in the future. The estimated allowance for uncollectible amounts is based primarily on a specific analysis of accounts in the receivable portfolio and historical write-off experience. While management believes the allowance to be adequate, if the financial condition of our customers were to deteriorate, resulting in impairment of their ability to make payments, additional allowances may be required.

Inventory

We value our inventory at the lower of actual cost to purchase and/or manufacture the inventory or the current estimated market value of the inventory. We periodically review inventory quantities on hand and record a provision for excess and/or obsolete inventory based primarily on our estimated forecast of product demand, as well as based on historical usage. Due to the custom and specific nature of certain of our products, demand and usage for products and materials can fluctuate significantly. A significant decrease in demand for our products could result in a short-term increase in the cost of inventory purchases and an increase of excess inventory quantities on hand. In addition, our industry is characterized by rapid technological change, frequent new product development, and rapid product obsolescence that could result in an increase in the amount of obsolete inventory quantities on hand. Therefore, although we make every effort to ensure the accuracy of our forecasts of future product demand, any significant unanticipated changes in demand or technological developments could have a significant impact on the value of our inventory and our reported operating results.

Warranty

We offer warranty coverage for our products for periods typically ranging from 1 to 5 years after shipment. We estimate the anticipated costs of repairing products under warranty based on the historical or expected cost of the repairs and expected failure rates. The assumptions used to estimate warranty accruals are reevaluated quarterly, at a minimum, in light of actual experience and, when appropriate, the accruals or the accrual percentage is adjusted based on specific estimates of project repair costs and quantity of product returns. Our determination of the appropriate level of warranty accrual is based on estimates of the percentage of units affected and the repair costs. Estimated warranty costs are recorded at the time of sale of the related product, and are recorded within cost of sales in the consolidated statements of operations.

Warrant Liabilities

We determined the fair values of our warrant liabilities using valuation models we consider to be appropriate. Our stock price has the most significant influence on the fair value of the warrants. An increase in our common stock price would cause the fair values of warrants to increase, because the exercise prices of such instruments are fixed and result in a charge to our statement of operations. A decrease in our stock price would likewise cause the fair value of the warrants to decrease and result in a credit to our statement of operations. As a result of the modification made to certain provisions of the warrants issued in connection with the Series C Preferred Stock financing, we will no longer be required to mark such warrants to fair value each quarter. See Note C. Significant Accounting Policies and Basis of Consolidation - Warrant Liabilities for a description of the modifications made to such warrants.

Income Taxes

The preparation of our consolidated financial statements requires us to estimate our income taxes in each of the jurisdictions in which we operate, including those outside the United States, which may be subject to certain risks that ordinarily would not be expected in the United States. The income tax accounting process involves estimating our actual current exposure together with assessing temporary differences resulting from differing treatment of items, such as deferred revenue, for tax and accounting purposes. These differences result in the recognition of deferred tax assets and liabilities. We must then record a valuation allowance to reduce our deferred tax assets to the amount that is more likely than not to be realized.

Significant management judgment is required in determining our provision for income taxes, our deferred tax assets and liabilities and any valuation allowance recorded against deferred tax assets. We have recorded a full valuation allowance against our deferred tax assets of approximately $48.9 million as of December 31, 2008, due to uncertainties related to our ability to utilize these assets. The valuation allowance is based on our estimates of taxable income by jurisdiction in which we operate 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 adjust our valuation allowance which could materially impact our financial position and results of operations.

We account for income taxes utilizing asset and liability method for accounting and reporting for income taxes. Under this method, deferred tax assets and deferred tax liabilities are recognized based on temporary differences between the financial reporting and income tax basis of assets and liabilities using statutory rates. In addition, the Company is required to establish a valuation allowance against net deferred tax assets if, based upon the available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized.

The tax years 2003 through 2008 remain open to examination by major taxing jurisdictions to which we are subject, which are primarily in the United States, as carry forward attributes generated in years past may still be adjusted upon examination by the

Internal Revenue Service or state tax authorities if they are or will be used in a future period. We are currently not under examination by the Internal Revenue Service or any other jurisdiction for any tax years. We did not recognize any interest and penalties associated with unrecognized tax benefits in the accompanying financial statements. We would record any such interest and penalties as a component of interest expense. We do not expect any material changes to the unrecognized benefits within 12 months of the reporting date.

Redeemable Convertible Series B Preferred Stock

We account for our Series B Preferred Stock and associated warrants in accordance with in accordance with ASC 470-20-30, allocating the proceeds received net of transaction costs based on the relative fair value of the redeemable convertible Series B Preferred Stock and the warrants issued to the Investors, and then to any beneficial conversion rights contained in the convertible redeemable preferred securities. We determined the initial value of the Series B Preferred Stock and investor warrants using valuation models we consider to be appropriate. The Series B Preferred Stock is classified within the liability section of our balance sheet. To the extent that the Series B Preferred Stock is subject to a remeasurement event, or is otherwise modified, the Series B Preferred Stock will be reclassified to temporary equity.

Redeemable Convertible Series C Preferred Stock

We account for our issuance of Series C Preferred Stock and associated warrants in accordance with in accordance with ASC 470-20-30,allocating the proceeds received net of transaction costs based on the relative fair value of the redeemable convertible Series C Preferred Stock and the warrants issued to the Investors, and then to any beneficial conversion rights contained in the convertible redeemable preferred securities and classifying the Series C Preferred Stock as temporary equity on the balance sheet between the captions for liabilities and permanent shareholder's equity. We determined the initial value of the Series C Preferred Stock and investor warrants using valuation models we consider to be appropriate.

The re-pricing of the exercise price of the first tranche warrants from $1.44 to $1.25, as described in the footnotes to the financial statements, was treated as a cancellation of the original warrants issued on November 8, 2007 and a re-issuance of new warrants on December 20, 2007. The difference in fair value of the warrant was included in the allocation of net proceeds associated with the second closing of the Series C Preferred Stock on December 20, 2007. We treated this as a deemed dividend on the Series C Preferred Stock. We are using the effective interest method to accrete the carrying value of the Series C Preferred stock through the earliest possible redemption date (November 8, 2011), at which time the value of the Series C Preferred Stock would be $30.0 million, 120% of its face value.

Recent Accounting Pronouncements

See Note P of our Notes to Consolidated Financial Statements for information regarding recently issued accounting pronouncements.

Results of Operations

Three Months Ended October 3, 2009 ("2009") Compared to Three Months Ended September 27, 2008 ("2008")

Revenue. Total revenue for 2009 decreased approximately $6.8 million, or 37%, from $18.5 million in 2008 to $11.7 million in 2009.

                                            Three Months Ended
                                       October 3,      September 27,
(Amounts in Millions)                     2009             2008           $ Change     % Change
Product Revenue
Alternative Energy Products           $        9.9    $          16.4    $     (6.5 )       (39 )%
Other Legacy                                   0.1                0.8          (0.7 )       (84 )%
Total Product Revenue                 $       10.0    $          17.2    $     (7.2 )       (42 )%
Funded Research and Development
and Other Revenue                     $        1.6    $           1.3    $      0.3          25 %
Total Revenue                         $       11.7    $          18.5    $     (6.8 )       (37 )%

Alternative Energy Product revenue decreased by $6.4 million, or 39%, from $16.4 million in 2008 to $10.0 million in 2009 due to the challenging macroeconomic market conditions and tough credit markets which affect our customers' ability to fund large scale renewable energy projects.

Funded research and development and other revenue increased approximately $0.3 million, or 25%, from approximately $1.3 million in 2008 to approximately $1.6 million in 2009. The increase is due to increases in revenue from government contracts during the period as compared to 2008.

Gross Margin. Total Company gross margin decreased from approximately 19% in 2008 to 1% in 2009. The decrease in gross margin over the period of a year ago is due to lower volumes during the period and transition costs associated with expanding our manufacturing and supply chain internationally while maintaining existing capacity in North America. These cost reduction efforts are crucial to our long term competitiveness, and were partially offset by material cost reductions and labor efficiency improvements in both factories.

Gross margins on funded research and development and other revenue increased from approximately 12% in 2008 to approximately 30% in 2009 due to a favorable product mix and higher labor efficiency as compared to that of 2008.

Research and development expenses. We expended approximately $2.2 million on research and development in 2009 compared with $1.6 million spent in 2008. The increase in spending during 2009 was driven by a planned increase in costs associated with certification of our new products and continued new product development, including increases in our technical staffing. These additional resources are developing the new products, features and customer solutions which we believe will allow us to take advantage of both short-term and long-term market opportunities. This investment in research and development is critical to both our current and future success and we anticipate this level of investment to continue.

Selling, general and administrative expenses. Selling, general and administrative expenses increased by approximately $0.3 million, or 6.5%, from $4.6 million in 2008 to $4.9 million in 2009. The increase was associated with a $0.6 million increase in sales and marketing costs directly related to international business development expansion into Europe and Asia along with increased outbound marketing efforts in 2009 compared to 2008, offset by decreased corporate costs of $0.3 million which included lower legal costs.

Restructuring costs. In August 2009, we eliminated certain positions within our operations and sales organizations in accordance with a plan of reorganization approved by the Board of Directors. As a result of the 2009 restructuring we recorded approximately $0.2 million in payroll and related costs for the three months ended October 3, 2009. As of October 3, 2009 approximately $0.2 million remains to be paid to the terminated employees. None of the terminated employees were required to provide any services subsequent to their receiving notification.

In 2008, we formalized the release of our Vice President of Finance and initiated and completed the sale of the Electronics and

Power Systems US operating divisions. As a result of these changes and the sale of the divisions in 2008, we accrued approximately $0.5 million in salary-related costs, costs associated with the modification of existing options held by certain of the severed employees and relocation costs. Other costs associated with the restructuring that are related to the Electronics and Power Systems US divisions were recorded in their respective divisions and are included in the loss from discontinued operations for the periods presented, as discussed below, in loss from discontinued operations.

Amortization of intangibles. Amortization of intangibles remained flat at $0.1 million in 2009 and 2008.

Change in fair value of warrant liabilities. The change in fair value of the warrants for 2009 was a charge of approximately $0.3 million related to the change in valuation of our Warrant As and Warrant Cs. The change in fair value of the warrants for 2008 was a credit of approximately $2.0 million.

Other income (expense). Other income was approximately $0.4 million for 2009 compared to other income of approximately $0.1 million for 2008. Other expense for 2009 consists primarily of foreign currency transaction gains and fees paid related to consulting services for the valuation of our warrant instruments as well as other expenses not related to ongoing operations. Other expense for 2008 consists primarily of foreign currency transaction gains and fees paid related to consulting services for the valuation of our warrant instruments as well as other expenses not related to ongoing operations.

Interest income. Interest income decreased from $0.1 million in 2008 to $0 in 2009.

Interest expense. Interest expense remained flat at $0.1 million in 2009 and 2008. Interest expense for 2009 includes approximately $8,000 of non-cash dividends on our Series B Preferred Stock, which we have elected to pay in shares of our common stock, and $31,000 in interest related our line of credit during the period. Interest expense for 2008 includes charges related to non-cash dividends on our Series B Preferred Stock, which we have elected to pay in shares of our common stock and interest on outstanding amounts under our line of credit during the period.

Loss from discontinued operations. Loss from discontinued operations represents the results of operations of our Power Systems US and Electronics divisions which were sold as of September 26, 2008. The loss from discontinued operations for 2008 was approximately $1.0 million. See Note D "Discontinued Operations" for more information related to the sale of these divisions.

Gain on sale of discontinued operations. As a result of the sale of the Power Systems US and Electronics divisions in 2008, we recorded a gain of approximately $0.3 million. See Note D "Discontinued Operations" for more information related to the sale of these divisions and the composition of the net gain calculated for each division.

Nine Months Ended October 3, 2009 ("2009") Compared to Nine Months Ended September 27, 2008 ("2008")

Revenue. Total revenue for 2009 decreased approximately $7.5 million, or 17%, from $43.2 million in 2008 to $35.7 million in 2009.

                                         Nine Months Ended
                                  October 3,       September 27,
(Amounts in Millions)                2009              2008            $ Change      % Change
Product Revenue
Alternative Energy Products      $       26.4    $            34.9    $      (8.5 )        (24 )%
Other Legacy                              4.6                  2.0            2.6          126 %
Total Product Revenue            $       31.0    $            36.9    $       5.9          (16 )%
Funded Research and
Development and other revenue    $        4.7    $             6.3    $      (1.6 )        (26 )%
Total Revenue                    $       35.7    $            43.2    $      (7.5 )        (17 )%

Alternative Energy Product revenue decreased by $8.5 million, or 24%, from $34.9 million in 2008 to $26.4 million in 2009 due to the overall continuing macroeconomic market conditions. The decrease in Alternative Energy Products was offset by the recognition of approximately $4.6 million related to the sale of frequency converters, classified as "Other Legacy" product revenue, in 2009, for which the recognition of revenue had been deferred until the product was accepted by the customer, which was obtained during 2009.

Funded research and development and other revenue decreased $1.6 million, or . . .