Accordingly, this Prospectus Supplement No. 2 includes the Quarterly Report on Form 10-Q for the quarter ended June 30, 2005, which is annexed hereto in its entirety.

This Prospectus Supplement No. 2 is not complete without, and may not be delivered or utilized except in connection with, the Prospectus included in the Registration Statement on Form S-1/A dated April 21, 2005, including any amendments and supplements thereto.

Investing in our Common Stock Involves Risks. You should review carefully and consider the information described under the heading "Risk Factors" on pages 4 through 13 in the Prospectus.

The date of this Prospectus Supplement is August 9, 2005.

====================================================================

/X/ Quarterly report pursuant to Section 13 or 15 (d) of the Securities

Exchange Act of 1934

For the quarterly period ended June 30, 2005

or

/ / 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 0-6890

(Exact name of registrant as specified in its charter)

(Address of principal executive offices) (Zip Code)

(Registrant's telephone number, including area code)

(Former name, former address and former fiscal year, if changed since last report)

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 x No ¨

Indicate by check mark whether the registrant is an accelerated filer (as defined in Rule 12b-2 of the Exchange Act). Yes x No ¨

Indicate the number of shares outstanding of each of the issuer's classes of common stock, as of the latest practicable date.

2

The accompanying notes are an integral part of the condensed consolidated financial statements.

The accompanying notes are an integral part of the condensed consolidated financial statements.

The accompanying notes are an integral part of the condensed consolidated financial statements.

5

(Dollars in thousands)

The accompanying notes are an integral part of the condensed consolidated financial statements.

6

1. Basis of Presentation

In the opinion of management, the accompanying unaudited condensed consolidated financial statements have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission ("SEC") and contain all adjustments, consisting of only normal, recurring adjustments, necessary for a fair statement of results for such periods. The results of operations for the interim periods presented are not necessarily indicative of results for the full year.

Certain information and footnote disclosures normally included in the annual consolidated financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted. These unaudited condensed consolidated financial statements should be read in conjunction with the Company's audited consolidated financial statements and notes thereto included in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2004, as amended.

The information presented in the accompanying condensed consolidated balance sheet as of December 31, 2004 has been derived from the Company's December 31, 2004 audited consolidated financial statements. All other information has been derived from the Company's unaudited condensed consolidated financial statements for the periods as of and ended June 30, 2005 and 2004.

2. Significant Accounting Policies

Revenue Recognition

The Company applies the guidance within SEC Staff Accounting Bulletin ("SAB") No. 104, Revenue Recognition, which superceded SAB No. 101, Revenue Recognition in Financial Statements in the evaluation of its contracts to determine when to properly recognize revenue. Under SAB No. 104, revenue is recognized when title and risk of loss have passed to the customer, there is persuasive evidence of an arrangement, the fee is fixed or determinable, delivery has occurred or services have been rendered, the sales price is determinable, and collectibility is reasonably assured.

Product Revenue

Product revenue is recognized when there is persuasive evidence of an arrangement, the collection of a fixed fee is probable or determinable, delivery of the product to the customer or distributor has occurred, at which time title generally is passed to the customer or distributor, all of which generally occur upon shipment of the product. If the product requires installation to be performed by the Company, 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 the Company can objectively and reliably demonstrate that the criteria specified in the acceptance provisions are satisfied.

The Company defers recognition of its initial micro fuel cell product-related revenue at the time of delivery and recognizes revenue as the continued warranty obligations expire. The costs associated with the product and warranty obligations are expensed as they are incurred. The Company's initial shipment of its micro fuel cell product is a customer specific arrangement that includes fuel cell systems and continued warranty support. While contract terms require payment upon delivery of the fuel cell system and are not contingent on the achievement of specific milestones or other substantive performance, the continuing obligation to warranty the product results in the Company deferring recognition of product-related revenue and recognizing product-related revenue when the warranty obligations expire. The warranty on the product is for a period of fifteen months. When micro fuel cell product-related revenue qualifies for revenue recognition it will be recorded in the Consolidated Statements of Operations in the line titled "Other income (expenses), net."

 

As the Company gains commercial experience, including field experience relative to warranty based on the sales of its initial products, in future periods, the Company may recognize product-related revenue upon delivery of the product or may continue to defer recognition, based on application of appropriate guidance within SAB No. 104, or changes in the manner contractual agreements are structured, including agreements with distribution partners.

8

2. Significant Accounting Policies (Continued)

MTI Instruments, Inc. ("MTI Instruments"), a wholly-owned subsidiary of the Company, currently has distributor agreements in place for (1) the domestic sale of its semiconductor products and (2) the international sale of general instrument and semiconductor products in certain global regions.  Such agreements grant a distributor the right of first refusal to act as distributor for such products in the distributor's territory.  In return, the distributor agrees to not market other products which are considered by MTI Instruments to be in direct competition with MTI Instruments' products. The distributor is allowed to purchase MTI Instruments' equipment at a price which is discounted off the published domestic/international list prices. Such list prices can be adjusted by MTI Instruments during the term of the distributor agreement, but MTI Instruments must provide advance notice at least 90 days before the price adjustment goes into effect.  Generally, payment terms with the distributor are standard net 30 days; however, on occasion, extended payment terms have been granted.  Title to the product passes to the distributor upon delivery to the independent carrier (standard FOB factory), and the distributor is responsible for any required training and/or service with the end-user.  The sale (and subsequent payment) between MTI Instruments and the distributor is not contingent upon the successful resale of the product by the distributor.  Distributor sales are covered by MTI Instruments' standard one-year warranty and there are no special return policies for distributors.

Some of MTI Instruments' direct sales, particularly sales of semi-automatic and fully-automated semiconductor metrology equipment, involve on-site customer acceptance and/or training.  In those instances, revenue recognition does not take place at time of shipment.  Instead, MTI Instruments recognizes the sale after the unit is installed and/or training is performed and an on-site acceptance is given by the customer.  Agreed-upon acceptance terms and conditions, if any, are negotiated at time of purchase. 

The Company performs funded research and development for government agencies and commercial companies under both cost reimbursement and fixed-price contracts.  Cost reimbursement contracts provide for the reimbursement of allowable costs.  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 the services are performed. In each type of contract, the Company generally receives periodic progress payments or payments upon reaching interim milestones. When the current estimates of total contract revenue for commercial development contracts indicate a loss, a provision for the entire loss on the contract is recorded. Any losses incurred in performing funded research and development projects are recognized as research and development expense as incurred. When government agencies are providing funding they do not expect the government to be the only significant end user of the resulting products.  These contracts do not require delivery of products that meet defined performance specifications, but are best efforts arrangements to achieve overall research and development objectives. Included in accounts receivable are billed and unbilled work-in-progress on contracts. Billings in excess of contract revenues earned are recorded as deferred revenue. While the Company's accounting for government contract costs is subject to audit by the sponsoring entity, in the opinion of management, no material adjustments are expected as a result of such audits. Adjustments are recognized in the period made.

The Company has fixed-price contracts with the following entities: Harris Corporation ("Harris"), Cabot Superior Micro Powders ("CSMP"), the U.S. Marines and the U.S. Army. These contracts will each result in the following funding amounts upon completion of research tasks (CSMP and the U.S. Marines) or prototypes (Harris and the U.S. Army) of $210,000, $69,907, $250,000 and $249,831, respectively.

The Company has two cost-shared contracts with the following entities: the New York State Energy Research and Development Authority ("NYSERDA"); and the Department of Energy ("DOE"). These contracts require that the Company's subsidiary MTI MicroFuel Cells Inc. ("MTI Micro") conduct research and deliver direct methanol micro fuel cell ("DMFC") prototypes pursuant to predefined work plans and schedules. The contracts with NYSERDA and DOE result in the following total multi-year contract expenditures by MTI Micro:

9

2. Significant Accounting Policies (Continued)

$2,702,080 and $6,144,094, and result in total multi-year funding of $1,249,736 and $3,000,000, respectively.

MTI Micro retains ownership of the intellectual property ("IP") generated under each of its federal government contracts and under contracts with Harris and CSMP. Each federal government agency retains a government use license and march- in rights if MTI Micro fails to commercialize technology generated under the contract. In addition, under the NYSERDA contract, MTI Micro has the right to elect to retain any invention made under the NYSERDA contract within six months of invention. NYSERDA also retains rights to a government use license for New York State and its political subdivisions for any inventions made under the contract. In addition, MTI Micro agreed to pay NYSERDA a royalty of 1.5% of the sales price of any product sold incorporating IP developed pursuant to the NYSERDA contract if the product is manufactured by a New York State manufacturer. This royalty increases to 5% if the manufacturer is not deemed to be a New York State manufacturer. In any event, the royalty is subject to a cap equal to two times the total contract funds paid by NYSERDA to MTI Micro as reduced to reflect any New York State jobs created by MTI Micro.

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

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

The Company records a warranty reserve at the time product revenue is recorded based on a historical rate. The reserve is reviewed during the year and is adjusted, if appropriate, to reflect new product offerings or changes in experience. Actual warranty claims are tracked by product.

Inventories are stated at the lower of cost (first-in, first-out) or market.

The Company has two stock-based employee compensation plans and its majority-owned subsidiary, MTI Micro, has one stock-based employee compensation plan, which are described more fully in Note 13, Stock Based Compensation, of the consolidated financial statements for the year ended December 31, 2004. Statement of Financial Accounting Standards ("SFAS") No. 123, Accounting for Stock-Based Compensation, requires the measurement of the fair value of stock options or warrants granted to employees to be included in the consolidated statements of operations or, alternatively, disclosed in the notes to consolidated financial statements. The Company accounts for stock-based compensation of employees under the intrinsic value method of Accounting Principles Board ("APB") Opinion No. 25, Accounting for Stock Issued to Employees, and related Interpretations and has elected the disclosure-only alternative under SFAS No. 123. The Company records the fair market value of stock options and warrants granted to non-employees in exchange for services in accordance with Emerging Issues Task Force ("EITF") Issue No. 96-18, Accounting for Equity Instruments That Are Issued to Other Than Employees for Acquiring, or in Conjunction with Selling, Goods or Services, in the condensed consolidated statements of operations. The Company does not intend to adopt the transition provisions of SFAS No. 148, Accounting for Stock-Based Compensation-Transition and Disclosure.

The following table illustrates the effect on net loss and loss per share as if the Company had applied the fair value recognition provisions of SFAS No. 123, Accounting for Stock-Based Compensation, to stock-based employee compensation.

10

2. Significant Accounting Policies (Continued)

The Company held or has outstanding the following derivative financial instruments:

11

2. Significant Accounting Policies (Continued)

(1) - The Company and Fletcher International, Ltd. Entered into an amended private placement agreement on May 4, 2004.

(2) -The exercise price for the Plug Power Investment Right is $10,000,000 less the positive difference between $18,000,000 and the product of 2,680,671 shares multiplied by the prevailing price per share of our common stock on the date Fletcher elects to exercise such right, all divided by the quotient obtained by dividing 10,000,000 by the prevailing price of Plug Power common stock on the date Fletcher elects to exercise such right. This right was fully exercised on June 24, 2005.

(3) - The Company incurred a registration penalty during March 2005 which resulted in a reduction in the exercise price for the Second Investment Right from $6.34 to $6.023 per share.

The Plug Power Investment Right, prior to its exercise, was valued on a quarterly basis using the Black-Scholes Option Pricing model and upon its exercise on June 24, 2005 was valued using the intrinsic value method. Significant assumptions used in the valuation included exercise dates, closing stock prices for the common stock of the Company and Plug Power Inc. ("Plug Power"), volatility of the common stock of the Company and Plug Power, risk-free interest rate and estimated number of shares in escrow. (Losses) gains on derivatives are included in "(Loss) gain on derivatives" in the condensed consolidated statements of operations.

On June 24, 2005, Fletcher International, Ltd. ("Fletcher") notified the Company of Fletcher's election to exercise in full its right to purchase from the Company certain shares of common stock of Plug Power. As a result of this election, Fletcher purchased 1,799,791 shares of Plug Power common stock from the Company at a price of $0.7226 per share, with proceeds to the Company of $1.301 million. This transaction closed on June 28, 2005 and, in connection with this exercise, the Company recognized a loss on the derivative immediately prior to exercise of $7.173 million and a gain on the sale of Plug Power common shares of $9.635 million.

The Company accounts for taxes in accordance with SFAS No. 109, Accounting for Income Taxes, which requires the use of the asset and liability method of accounting for income taxes. Under the asset and liability method, deferred income taxes are recognized for the tax consequences of "temporary differences" by applying enacted statutory tax rates applicable for future years to differences between financial statement and tax bases of existing assets and liabilities. Under SFAS No. 109, the effect of tax rate changes on deferred taxes is recognized in the income tax provision in the period that includes the enactment date. The provision for taxes is reduced by investment and other tax credits in the years such credits become available. A valuation allowance is recorded to reduce the carrying amounts of deferred tax assets unless it is more likely than not that such assets will be realized.

3. Accounts Receivable and Allowance for Doubtful Accounts

Included in accounts receivable are the following at:

The balances billed but not paid by customers pursuant to retainage provisions in contracts are due upon completion of the contracts and acceptance by the customer. Based on the Company's experience, most retainage amounts are expected to be collected within the ensuing year.

12

4. Inventories

Inventories consist of the following at:

5. Securities Available for Sale

Securities available for sale are classified as both current assets and long-term restricted assets and accumulated net unrealized gains are reported in Other Comprehensive Income.

The principal components of the Company's securities available for sale consist of the following at:

(Dollars in thousands, except stock price and share data)

The book basis roll forward of Plug Power securities is as follows:

13

5. Securities Available for Sale (Continued)

Accumulated unrealized gains related to securities available for sale are as follows:

6. Income Taxes

The Company's effective income tax (expense) benefit rate from operations differed from the Federal statutory rate as follows:

Income tax (expense) benefit consists of the following:

14

6. Income Taxes (Continued)

The valuation allowance at June 30, 2005 and December 31, 2004 was $5.972 million and $1.836 million, respectively. It is anticipated that a full valuation allowance will be required by the end of 2005. The income tax provision for both the three and six months ended June 30, 2005 have been adjusted to reflect the projected annual effective tax rate including the anticipated impact of a full valuation allowance. The valuation allowance reflects the estimate that it was more likely than not that certain net operating losses may be unavailable to offset future taxable income.

7. Shareholders' Equity

Changes in common shares issued are as follows:

Changes in treasury stock shares are as follows:

15

7. Shareholders' Equity (Continued)

The Company has reserved common shares for future issuance as of June 30, 2005 as follows:

The Company entered into a financing transaction with Fletcher International, Ltd. ("Fletcher"), on January 29, 2004 and amended the terms of such transaction on May 4, 2004. To date Fletcher has purchased 2,680,671 shares of our common stock pursuant to such financing transaction. In addition, Fletcher has the right to purchase an additional $20 million of the Company's common stock, on one or more occasions, at a price of $6.023

(adjusted from $6.34) per share at any time prior to December 31, 2006. Fletcher also has the right to receive Company shares without payment upon the occurrence of certain events, including but not limited to, failing to register for resale with the SEC shares purchased by Fletcher on the time table agreed to, a restatement of the Company's financial statements, change of control of the Company and issuance of securities at a price below Fletcher's purchase price. We have filed registration statements covering all of the shares purchased by Fletcher to date and in the event of any additional purchases we are similarly obligated to file one or more registration statements covering the resale of such shares.

We filed a registration statement on January 6, 2005 covering the resale of 1,261,829 shares of our common stock purchased by Fletcher on December 22, 2004. The Company failed to meet its contractual obligation with Fletcher to have such registration statement declared effective by March 22, 2005 and therefore under the terms of the Fletcher agreement we were required to issue additional shares of common stock to Fletcher and the exercise price for the Fletcher additional investment rights has been reduced to $6.023 per share. We are required to issue a number of shares of common stock that will result in Fletcher having effectively made its December 2004 investment at a price per share that is lower than the actual price paid. We refer to this reduced exercise price as the "deemed exercise price." More specifically, for each month during which we fail to satisfy the registration requirement, the deemed exercise price is reduced by $0.317 per share. As a consequence, on April 20, 2005 we issued 66,413 shares of common stock to Fletcher without any additional payment required by Fletcher, representing a deemed exercise price for Fletcher's December 2004 investment of $6.023 per share. In addition, since we are required to file a registration statement covering the resale of any such additional shares issued to Fletcher, we amended the registration statement initially filed in January 2005 to include the additional 66,413 shares of common stock. That registration statement, covering the resale of 1,328,242 shares of common stock, was declared effective by the SEC on April 21, 2005.

16

7. Shareholders' Equity (Continued)

On June 24, 2005, Fletcher notified the Company of its election to exercise in full its right to purchase from the Company certain shares of common stock of Plug Power. As a result of this election, Fletcher purchased 1,799,791 shares of Plug Power common stock from the Company at a price of $0.7226 per share, with proceeds to the Company of $1.301 million. This transaction closed on June 28, 2005 and, in connection with this exercise, the Company recognized a loss on the derivative immediately prior to exercise of $7.173 million and a gain on the sale of Plug Power common shares of $9.635 million.

The Company had placed 2,700,000 shares of Plug Power common stock in escrow that were available for purchase by Fletcher in certain instances. Fletcher could, on one or multiple occasions, from June 1, 2005 to December 31, 2006, exercise its right to purchase from us a number of shares of Plug Power common stock totaling $10,000,000 divided by the prevailing price (as defined below) per share of Plug Power common stock, but only to the extent of the number of shares remaining in escrow. Commencing immediately after the SEC declared effective on May 20, 2004 the registration statement relating to shares of our common stock owned by Fletcher, we had the right to have 250,000 of such shares released from escrow to us, on a monthly basis, in the event that on any day during such month, the prevailing price of our common stock exceeds $6.343 (which price may have been adjusted to reflect stock splits, recombinations, stock dividends or the like).

The exercise price for the Plug Power investment right was $10,000,000 less the positive difference between $18,000,000 and the product of the sum of 2,680,671 shares multiplied by the prevailing price per share of our common stock on the date Fletcher elected to exercise such right, all divided by the quotient obtained by dividing 10,000,000 by the prevailing price of Plug Power common stock on the date Fletcher elected to exercise such right. As used herein, a prevailing price is the average of the daily volume-weighted average price per share of common stock during the sixty-business-day period ending three days prior to the date Fletcher elects to exercise such right, provided however that the price may not exceed the average of the daily volume-weighted average prices for any ten business days within such sixty-business day period.

The additional investment rights provide Fletcher with the right, but not the obligation, to purchase, in a single purchase or multiple purchases, up to an additional $20 million of our common stock at any time prior to December 31, 2006 at a price per share equal to $6.023 (adjusted from $6.34), which date and price may be extended and adjusted, respectively, in the event that we have not satisfied our contractual obligations with respect to the registration for resale of common stock issued or issuable to Fletcher.

The table below illustrates the number of shares Fletcher would receive upon exercise of its $20 million additional investment right at a price per share equal to $6.023 (adjusted from $6.34) (such exercise price is subject to adjustment as described below under "Adjustment Provisions"). Further, the Company's 2004 private placement agreement with Fletcher provides that the maximum number of shares we could potentially issue to Fletcher is 8,330,411 shares.

• a restatement of our financial results,
• a change in control of our company,

7. Shareholders' Equity (Continued)

• a future issuance of our capital stock at a price less than $7.048 as it relates to the initial $10 million investment and $6.34 as it relates to all additional investments, or
• our failure to maintain the effectiveness of the registration statement relating to shares of our common stock that Fletcher owns or may acquire, as well as our failure to satisfy the other requirements relating to registration.
  

In the event we restate any portion of our financial statements prior to January 29, 2005, or prior to the first anniversary of the closing of any additional investment, as the case may be, the exercise price for the additional investment rights may be adjusted to equal the average price (as defined) of our common stock sixty days after we restate our financial statements if the average price of the Company's common stock sixty days after a restatement is five percent lower than the average price three days before the restatement (a "Qualifying Restatement"). In addition, with respect to any investments made prior to the time of the restatement, Fletcher would receive additional shares of common stock such that all such investments will have been effectively made at such adjusted exercise price.

The following table illustrates the number of additional shares of common stock Fletcher would receive without any additional payment on its part in the event that the average price of the Company's common stock sixty days after a restatement (as defined) is $4.00 per share and $3.00 per share.

In response to comments received from the SEC staff of the Division of Corporation Finance, the Company previously amended its current Annual Report on Form 10-K for the year ended December 31, 2004 and its prior

Annual Reports on Form 10-K for the years ended December 31, 2003 and December 31, 2002 to supplement the Company's financial statements with additional financial statements of SatCon Technology Corporation and Plug Power, which were all previously publicly available, and to include certain summary financial information for both companies in the relevant notes to the Company's consolidated financial statements. In the Company's opinion, the above do not constitute restatements for purposes of its agreement with Fletcher.

18

7. Shareholders' Equity (Continued)

In the event we fail to satisfy our contractual obligations to register for resale shares of common stock issued or issuable to Fletcher, then we must issue to Fletcher a number of additional shares to reflect the number of shares it would have acquired if its purchase price was based on the actual exercise price reduced by five percent for each month in which we fail to satisfy our obligations and adjust the exercise price for the additional investment rights to such lower price. In addition, such failure will result in an extension of the investment term for each day we fail to satisfy our registration obligations. These registration obligations include, among other things, maintaining the effectiveness of registration statements.

As described above, we failed to satisfy the registration requirement for the 1,261,829 shares of common stock purchased by Fletcher on December 22, 2004 until April 21, 2005.

8. Loss Per Share

The following is the reconciliation of the numerators and denominators of the basic and diluted loss per share computations:

For the three and six months ended June 30, 2005, options to purchase 3,837,250 shares of common stock at exercise prices ranging from $0.54 to $20.92 per share, additional investment rights to purchase approximately 3,320,604 shares ($20 million divided by $6.023 per share) of common stock with an exercise price of $6.023 per share and warrants to purchase 28,377 shares of common stock with an exercise price of $10.572 per share were outstanding but were not included in the computations of Loss per Share-assuming dilution because the Company incurred losses during this period and inclusion would be anti-dilutive.

For the three and six months ended June 30, 2004, options to purchase 3,585,875 shares of common stock at exercise prices ranging from $0.54 to $20.92 per share, additional investment rights to purchase approximately 4,416,405 shares ($28,000,000 divided by $6.34 per share) of common stock with an exercise price of $6.34 per share and warrants to purchase 28,377 shares of common stock with an exercise price of $10.572 per share were outstanding but were not included in the computations of Loss per Share-assuming dilution because the Company incurred losses during this period and inclusion would be anti-dilutive.

19

9. Sale of Securities Available for Sale

The Company sold shares of the following securities and recognized gains and proceeds as follows:

11. Segment Information

The Company operates in two business segments, New Energy and Test and Measurement Instrumentation. The New Energy segment is focused on commercializing DMFCs. The Test and Measurement Instrumentation segment designs, manufactures, markets and services computer-based balancing systems for aircraft engines, high-performance test and measurement instruments and systems, and wafer characterization tools for the semiconductor industry. The Company's principal operations are located in North America.

The accounting policies of the New Energy and Test and Measurement Instrumentation segments are the same as those described in the summary of significant accounting policies in the Company's consolidated financial statements (See Note 1) for the year ended December 31, 2004. The Company evaluates performance based on profit or loss from operations before income taxes, accounting changes, items management does not deem relevant to segment performance, and interest income and expense. Inter-segment sales are not significant.

Summarized financial information concerning the Company's reportable segments is shown in the following table. The "Other" column includes corporate related items and items like income taxes or unusual

items, which are not allocated to reportable segments. The "Reconciling Items" column includes minority interests in a consolidated subsidiary. In addition, segments' noncash items include any depreciation and amortization in reported profit or loss. The New Energy segment figures include the Company's micro fuel cell operations, equity securities of Plug Power, gains (losses) on the sale of these securities, (losses) gains related to the embedded derivative for the purchase of Plug Power common stock and warrants to purchase SatCon common stock.

20

11. Segment Information (Continued)

21

11. Segment Information (Continued)

The following table presents the details of "Other" segment profit:

12. Related Party Transactions

The Company purchases materials from E.I. du Pont de Nemours and Company ("DuPont"), a shareholder in MTI Micro, such purchases totaled $87 thousand and $239 thousand for the six months ended June 30, 2005 and 2004, respectively. The Company has a liability to DuPont for materials purchases totaling $18 thousand as of June 30,

22

12. Related Party Transactions (Continued)

2005 and a net receivable totaling $2 thousand as of December 31, 2004. This liability is included in the financial statement line "Accrued liabilities - related parties." The net receivable is included in the financial statement line "Other receivables - related parties."

13. Effect of Recent Accounting Pronouncements

In November 2004, the Financial Accounting Standards Board ("FASB") issued SFAS No. 151, Inventory Costs-an amendment of ARB No. 43, Chapter 4 ("FAS 151"), which is the result of its efforts to converge U.S. accounting standards for inventories with International Accounting Standards. SFAS No. 151 requires idle facility expenses, freight, handling costs and wasted material (spoilage) costs to be recognized as current-period charges. It also requires that allocation of fixed production overheads to the costs of conversion be based on the normal capacity of the production facilities. SFAS No. 151 will be effective for inventory costs incurred during fiscal years beginning after June 15, 2005. The Company is in the process of evaluating the impact of this standard on its consolidated financial statements.

In December 2004, SFAS No. 123 (revised 2004), Share-Based Payment, (SFAS No. 123R) was issued. In March 2005 the SEC issued Staff Accounting Bulletin No. 107 (SAB 107). SAB 107 expresses views of the SEC staff regarding the interaction between SFAS 123R and certain SEC rules. SFAS 123R focuses primarily on accounting for transactions in which an entity obtains employee services in share-based payment transactions. SFAS 123R requires public entities to measure the cost of employee services received in exchange for an award of equity instruments based on the grant-date fair value of the award. The grant-date fair value of employee share options and similar instruments will be estimated using option-pricing models adjusted for the unique characteristics of those instruments. That cost will be recognized over the period during which an employee is required to provide service in exchange for the award. In April 2005, the SEC delayed the implementation of SFAS 123R for public companies until the first annual period beginning after June 15, 2005. SFAS 123R is required to be adopted by the Company as of January 1, 2006.

The Company currently utilizes a closed form option-pricing model to measure the fair value of stock-based compensation for employees. SFAS 123R permits the use of this model or other models such as a lattice model. The Company has not yet determined which model it will use to measure the fair value of share-based grants to employees upon the adoption of SFAS 123R. The effect of expensing stock options in accordance with the original SFAS 123 is presented above under Note 2, Significant Accounting Policies. SFAS 123R also requires that the benefits associated with the tax deductions in excess of recognized compensation cost be reported as a financing cash flow, rather than as an operating cash flow as required under current literature. This presentation may reduce net operating cash flows and increase net financing cash flows in periods after the effective date. The amount of this excess tax deduction benefit was $39 thousand and $128 thousand in the six months ended June 30, 2005 and 2004, respectively. The unvested value of share awards to be amortized into the operating statement is approximately $4.791 million as of June 30, 2005.

In December 2004, the FASB issued SFAS No. 153, Exchanges of Non-monetary Assets, an amendment of APB Opinion No. 29. SFAS No. 153 addresses the measurement of exchanges of non-monetary assets and redefines the scope of transactions that should be measured based on the fair value of the assets exchanged. SFAS No. 153 is effective for non-monetary asset exchanges in fiscal periods beginning after June 15, 2005. The Company is in the process of evaluating the impact of this standard on its consolidated financial statements.

In May 2005, SFAS No. 154, Accounting Changes and Error Corrections - replacement of APB Opinion No. 20 and FASB Statement No. 3, (SFAS No. 154) was issued. SFAS No. 154 changes the accounting for and reporting of a change in accounting principle by requiring retrospective application to prior periods' financial statements of changes in accounting principle unless impracticable. SFAS No. 154 is effective for accounting changes made in fiscal years beginning after December 15, 2005. The Company does not expect the adoption of SFAS No. 154 to have a material impact on its results of operations, financial position or cash flows.

23

14. Commitments and Contingencies

Lawrence

On September 9, 1998, Barbara Lawrence, the Lawrence Group, Inc. ("Lawrence"), and certain other Lawrence-related entities ("Plaintiffs") initially filed suit in the Bankruptcy Court and the United States District Court for the Northern District of New York which were subsequently consolidated in the District Court, against First Albany Corporation ("FAC"), Mechanical Technology Incorporated, Dale Church, Edward Dohring, Beno Sternlicht, Alan Goldberg and George McNamee (former Directors of the Company), Marty Mastroianni (former President and Chief Operating Officer of the Company), and 33 other individuals ("Defendants") who purchased a total of 820,909 (2,462,727 shares post split) shares of the Company's common stock from the Plaintiffs. The case concerns the Defendants' 1997 purchase of Mechanical Technology shares from the Plaintiffs at the price of $2.25 per share ($0.75 per share post split). FAC acted as Placement Agent for the Defendants in the negotiation and sale of the shares and in proceedings before the Bankruptcy Court for the Northern District of New York, which approved the sale in September 1997.

Plaintiffs claim that the Defendants failed to disclose material inside information concerning Plug Power, LLC to the Plaintiffs and therefore the $2.25 per share ($0.75 per share post split) purchase price was unfair. Plaintiffs are seeking damages of $5 million plus punitive damages and costs. In April 1999, Defendants filed a motion to dismiss the amended complaint, which was denied by the Bankruptcy Court. On appeal in October 2000, Plaintiffs' cause of action was dismissed by the United States District Court for the Northern District of New

York. In November 2000, Plaintiffs filed an appeal of that dismissal with the United States Court of Appeals for the Second Circuit. In June 2002, the Second Circuit Court of Appeals reversed the District Court decision and remanded the case for further consideration of the Plaintiff's claims as motions to modify the Bankruptcy Court sale order. The Plaintiff's claims have now been referred back to Bankruptcy Court for such consideration. In September 2003, the Bankruptcy Court issued an order permitting Plaintiffs to conduct limited discovery concerning how First Albany formed an opinion about the Company's stock up until the date the Stock Purchase Agreement was executed. Discovery has commenced.

The Company believes the claims have no merit and intends to defend them vigorously. The Company cannot predict the outcome of the claims nor reasonably estimate a range of possible loss given the current status of the litigation. Accordingly, no amounts have been reserved for this matter.

The Company and its subsidiaries lease four manufacturing, laboratory and office facilities. The leases generally provide for the Company to pay either an increase over a base year level for taxes, maintenance, insurance and other costs of the leased properties or the Company's allocated share of insurance, taxes, maintenance and other costs of leased properties. The leases contain renewal provisions.

Future minimum rental payments required under non-cancelable operating leases are (dollars in thousands): $311 remaining in 2005; $498 in 2006, $327 in 2007, $316 in 2008, $289 in 2009, and $0 thereafter.

A reconciliation of changes in product warranty liabilities is as follows:

24

14. Commitments and Contingencies (Continued)

The Company licenses, on a non-exclusive basis, certain DMFC technology from Los Alamos National Laboratory ("LANL"). Under this agreement, the Company is required to pay future minimum annual license fees of $250 thousand yearly through 2019. Once products are being sold, royalties will be based on 2% of the first $50 million of net sales, 1% on net sales in excess of $50 million but less than $100 million and .5% on net sales in excess of $100 million. License payments made in any year can be applied against royalties due and total annual fees in any year shall not exceed $1 million.

the applicable agreements. As of June 30, 2005, the Company's potential minimum obligation to these employees was approximately $.924 million.

The Company's securities available for sale constitute investment securities under the Investment Company Act of 1940 (the "Investment Company Act"). In general, a company may be deemed to be an investment company if it owns investment securities with a value exceeding 40% of its total assets, subject to certain exclusions and exemptions.

Investment companies are subject to registration under, and compliance with, the Investment Company Act unless a particular exemption or safe harbor provision applies. If the Company were to be deemed an investment company, the Company would become subject to the requirements of the Investment Company Act. As a consequence, the Company would be prohibited from engaging in certain businesses or issuing certain securities, certain of the Company's contracts might be voidable, and the Company might be subject to civil and criminal penalties for noncompliance.

Until 2001, the Company qualified for a safe harbor exemption under the Investment Company Act based upon the level of its ownership of shares of Plug Power and its influence over Plug Power's management or policies. However, since the Company began selling shares of Plug Power, this safe harbor exemption is no longer available.

On December 3, 2001, the Company made an application to the SEC requesting that they either declare that the Company is not an investment company because it is primarily engaged in another business or exempt it from the provisions of the Investment Company Act. The Company amended this application on October 20, 2003. On July 18, 2005, the Company requested that the application be withdrawn following discussions and other communications with the SEC staff in which the staff expressed the view that the application was no longer necessary. Since the value of the Company's interests in Plug Power has decreased in relation to its total assets, the Company believes that it is not an investment company subject to the regulations of the Investment Company Act.

If the Company was deemed to be an investment company and could not find another safe harbor or exemption and failed to register as an investment company, the SEC could require the Company to sell its interest in Plug Power, until the value of these securities is further reduced in relation to the Company's total assets. This could result in sales of the Company's securities in quantities of shares at depressed prices and the Company may never realize anticipated benefits from, or may incur losses on, these sales. Further, the Company may be unable to sell some securities due to contractual or legal restrictions or the inability to locate a suitable buyer. Moreover, the Company may incur tax liabilities when selling assets.

25

14. Commitments and Contingencies (Continued)

During 2004, MTI Micro entered into a fixed price-cost type completion contract with the U.S. Army. The contract which totals $250 thousand permits monthly cost progress payments and calls for the delivery of five DMFC power system units. These prototypes require substantial engineering to meet the performance requirements of the customer. At the end of 2004, MTI Micro forecasted that the contract would be completed during 2005 and accrued $540 thousand for the then anticipated cost needed to be incurred to complete the project. The expected overrun is currently estimated at $828 thousand and the accrued anticipated cost to complete the project is $169 thousand as of June 30, 2005 and was $540 thousand as of December 31, 2004. Although MTI Micro believes that it will complete this contract to the satisfaction of the customer, it is possible that MTI Micro will not be successful. Through monthly reports, MTI Micro updates the customer on accomplishments, technical issues, financial status, forecast to complete and anticipated solutions.

Additionally, other contracts had forecasted costs in excess of contract values as of December 31, 2004. As of the end of 2004, MTI Micro accrued $17 thousand for the anticipated cost overruns for the projects and as of June 30, 2005 no amounts are accrued for the anticipated costs to complete the projects.

15. Issuance of Stock by Subsidiary

MTI Micro was formed on March 26, 2001. As of June 30, 2005, the Company owns approximately 89% of MTI Micro's outstanding common stock.

The increase in the Company's paid-in-capital related to the Company's investment in MTI Micro totaling $93 thousand for the period ended June 30, 2005, represents the changes in the Company's equity investment in MTI Micro, which resulted from third-party stock transactions in MTI Micro.

26

This Item 2 contains forward-looking statements that involve risks and uncertainties, which may cause the Company's actual results, performance or achievements to be materially different from those expressed or implied by such forward-looking statements. See "Statement Concerning Forward-Looking Statements" on pages 36 and 37.

The Company is primarily engaged in the development and commercialization of Mobion^TM cord-free advanced portable power systems, through its subsidiary MTI MicroFuel Cells Inc. ("MTI Micro"), and in the design, manufacture, and sale of high-performance test and measurement instruments and systems through its subsidiary MTI Instruments, Inc. ("MTI Instruments"). MTI also co-founded and retains a minority interest in Plug Power Inc. ("Plug Power") (Nasdaq: PLUG), a designer and developer of on-site energy systems based on proton exchange membrane fuel cells.

MTI Micro designs and develops Mobion^TM fuel cell systems for portable power applications. A micro fuel cell is a portable power source that converts chemical energy into useable electrical energy. MTI Micro is developing a micro fuel cell that uses methanol, a common alcohol, as its fuel. The Company believes direct methanol fuel cell ("DMFC") systems could potentially have an energy density of five to ten times that of Li-Ion batteries. The Company believes that, when commercialized, DMFC systems should be able to power a wireless electronic device for longer periods of time than Li-Ion batteries without recharging/refueling. In addition, Mobion^TM fuel cell systems may be instantly refueled eliminating the need for a power outlet or a lengthy recharge.

MTI Micro's fuel cell technology platform can be customized to provide portable power for a number of applications depending on the power level, required run time and size requirements. In December 2004, MTI Micro shipped its first low volume production of Mobion^TM fuel cell systems for use in hand held Radio Frequency Identification tag readers. Although this product shipment was an important milestone, the Company and MTI Micro recognize that significant technical, engineering, manufacturing, cost and marketing challenges remain before Mobion^TM fuel cells can become commercially viable or available.

MTI Instruments has three product groups: aviation, general gaging and semiconductor. These product groups provide: electronic, computerized general gaging instruments for position, displacement and vibration applications; and semiconductor products for wafer characterization of semi-insulating and semi-conducting wafers and vibration analysis systems for aircraft engines. MTI Instruments' strategy is to continue to enhance and expand its product offerings with the goal of increasing market share and profitability. MTI Instruments' largest customers include the U.S. Air Force and industry leaders in the computer, electronic, semiconductor, automotive, aerospace, aircraft and bioengineering fields.

MTI Instruments' engine balancing and vibration analysis system primarily serves the aviation industry, both in the commercial and military sectors.  These systems perform a number of vibration analysis and engine balancing functions typically for large turbofan engines on the flight-line and in test cells.  In addition, MTI Instruments' engine balancing and vibration analysis system has recently been used for the first time in an industrial turbo machinery application.

MTI Instruments' general gaging product line employs three sensing technologies - capacitance, fiber optics and laser triangulation - to measure displacement, position, thickness, vibration and other dimensional measurement applications.  The advantages of each technology are generally related to the requirements of specific applications, which typically transcend the capabilities of conventional measuring techniques.  End-users cover a broad range of industrial markets, as well as research labs, universities and the government agencies.

MTI Instruments' semiconductor tools compete in the wafer metrology segment of the semiconductor equipment market. Product models include manual units, semi-automated units and fully automated systems that measure thickness, total thickness variation, bow, warp, site and global flatness. These metrology and inspection tools

27

cover a broad range of applications both on the front-end and back-end of the manufacturing process. End-users of these tools include both wafer manufacturers (foundries) and device (chip) manufacturers.

From inception through June 30, 2005, the Company has incurred net losses of $75.471 million and expects to incur losses as it continues micro fuel cell product development and commercialization programs. The Company expects that losses will fluctuate from year to year and that such fluctuations may be substantial as a result of, among other factors, gains on sales of securities available for sale and the operating results of MTI Instruments and MTI Micro.

The Company's discussion and analysis of its financial condition and results of operations are based upon the Company's consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States of America. Note 1 to the Company's 2004 annual consolidated financial statements includes a summary of the Company's most significant accounting policies. The preparation of these financial statements requires the Company to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of assets and liabilities. On an on-going basis, the Company evaluates its estimates and judgments, including those related to revenue recognition, inventories, securities available for sale, income taxes and derivatives. 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 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. Our critical accounting estimates were discussed with our Audit Committee.

The following is management's discussion and analysis of certain significant factors, which have affected the Company's results of operations for the three and six months ended June 30, 2005 compared to the three and six months ended June 30, 2004.

Product Revenue. Product revenue for the three months ended June 30, 2005 increased in comparison to the same period in 2004 by $.054 million, or 4.4%, to $1.285 million. This increase is the result of increases in sales to general gaging customers of $.140 million and aviation customers of $.080 million offset by a decrease in sales to semiconductor customers of $.166 million. The increase in general instrument sales is primarily due to a $.171 million increase in capacitance product sales. The decrease in semiconductor sales reflects the shipment of one manual gage, one semi automated unit and two OEM machines during the second quarter of 2005 as compared to five manual gages, two semi-automated units and one AutoScan unit for the same period in 2004. The increase in sales to aviation customers includes a $.146 million increase in commercial aviation sales offset by $.111 million decrease related to the new buys Air Force contract which concluded in 2004.

Product revenue for the six months ended June 30, 2005 decreased in comparison to the same period in 2004 by $.122 million, or 4.3%, to $2.688 million. This decrease is the result of decreases in sales to semiconductor customers of $.308 million and aviation customers of $.055 million offset by increases in sales to general gaging customers of $.241 million. The decrease in semiconductor sales reflects the shipment of two manual gages, one semi automated unit and two OEM machines during the first half of 2005 as compared to ten manual gages and two semi-automated units and an AutoScan unit for the same period in 2004. The decrease in sales to aviation customers includes a $.292 million decrease related to the expiration of the new buy Air Force contract on September 30, 2004 coupled with the timing of shipments under the Retrofit Air Force contract due to fewer portable balancing systems, change amplifiers and accessory kits being sent by the U.S. Air Force for upgrade in 2005 than in 2004. This reduction in upgrade business was partially offset by the shipment of five new accessory kits under a priority contract from the U.S. Air Force for $.059 million and commercial unit sales of $.172 million. The increase in general instrument sales is primarily due to a $.261 million increase in capacitance product sales.

28

Information regarding government contracts included in product revenue is as follows:

(Dollars in thousands, except contract values)