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SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2004

OR

FOR THE TRANSITION PERIOD FROM TO

Commission File Number: 0-27527

PLUG POWER INC.

(Exact name of registrant as specified in its charter)

968 ALBANY-SHAKER ROAD, LATHAM, NEW YORK 12110

(Address of registrant’s principal executive office)

(518) 782-7700

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Sections 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  ¨

The number of shares of common stock, par value of $.01 per share, outstanding as of July 1, 2004 was 73,141,633.

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PLUG POWER INC.

INDEX to FORM 10-Q

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Plug Power Inc. and Subsidiaries

(A Development Stage Enterprise)

Condensed Consolidated Balance Sheets

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

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Plug Power Inc. and Subsidiaries

(A Development Stage Enterprise)

Condensed Consolidated Statements of Operations

(Unaudited)

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

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Plug Power Inc. and Subsidiaries

(A Development Stage Enterprise)

Condensed Consolidated Statements of Cash Flows

(Unaudited)

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

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Plug Power Inc.

Notes to Condensed Consolidated Financial Statements

(Unaudited)

1. Nature of Operations

Description of Business

Plug Power Inc. and subsidiaries (Company) was originally formed as a joint venture between Edison Development Corporation (EDC) and Mechanical Technology Incorporated (MTI) in the State of Delaware on June 27, 1997 and succeeded by merger to all of the assets, liabilities and equity of Plug Power, L.L.C. in November 1999.

The Company is a development stage enterprise involved in the design, development and manufacture of on-site energy systems for energy consumers worldwide. The Company’s architecture-based technology platform includes proprietary proton exchange membrane (PEM) fuel cell and fuel processing technologies, from which multiple products are expected to be offered. The Company is currently developing: (1) back-up power products for telecommunications, broadband and industrial uninterruptible power supply (UPS) applications; (2) on-site hydrogen generation for a variety of industrial gas applications; (3) combined heat and power products for remote residential and small commercial applications; and (4) battery-replacement modules for material handling equipment.

Liquidity

The Company’s cash requirements depend on numerous factors, including but not limited to, product development activities, ability to commercialize its on-site energy systems, market acceptance of its systems and other factors. The Company expects to continue to devote substantial capital resources to its development programs directed at commercializing on-site energy systems worldwide and to hire and train production staff, develop and expand manufacturing capacity and continue research and development activities. The Company will pursue expansion of its operations through internal growth and strategic alliances and expects such activities will be funded from existing cash and cash equivalents, marketable securities and the issuance of equity or debt securities or other borrowings subject to market and other conditions.

At June 30, 2004, the Company had unrestricted cash, cash equivalents and marketable securities in the amount of $82.9 million and working capital of $82.0 million. Management believes that the Company’s currently available cash, cash equivalents and marketable securities will provide sufficient capital to fund operations for at least the next twelve months.

2. Basis of Presentation

Principles of Consolidation: The accompanying unaudited condensed consolidated financial statements include the accounts of the Company and its subsidiaries. All significant intercompany transactions have been eliminated in consolidation.

Interim Financial Statements: The unaudited condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission. In the opinion of management, all adjustments, which consist solely of normal recurring adjustments, necessary to present fairly, in accordance with generally accepted accounting principles, the financial position, results of operations and cash flows for all periods presented, have been made. The results of operations for the interim periods presented are not necessarily indicative of the results that may be expected for the full year.

Certain information and footnote disclosures normally included in annual consolidated financial statements prepared in accordance with generally accepted accounting principles 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 filed for the fiscal year ended December 31, 2003.

The information presented in the accompanying condensed consolidated balance sheet as of December 31, 2003 has been derived from the Company’s December 31, 2003 audited consolidated financial statements. All other information has been derived from the Company’s unaudited consolidated financial statements for the periods as of and ending June 30, 2004 and 2003.

Cash Equivalents and Restricted Cash: Cash equivalents consist of money market accounts, overnight repurchase agreements and certificates of deposit with an initial term of less than three months. For purposes of the condensed consolidated statements of cash flows, the Company considers all highly liquid debt instruments with original maturities of three months or less to be cash equivalents.

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At June 30, 2004, the Company had restricted cash in the amount of $4.7 million that is required to be placed in escrow to collateralize debt related to the purchase of real estate. The escrowed amounts are recorded under the captions, “Restricted cash” in the accompanying condensed consolidated balance sheets.

Marketable Securities: Marketable securities include investments in corporate debt securities and US Treasury obligations which are carried at fair value and are considered available for sale. At June 30, 2004, the difference between the cost and the fair value of these securities result in an unrealized loss in the amount of $528,000 which is reflected as a component of stockholders’ equity under the caption, “Accumulated other comprehensive loss”. At June 30, 2004, the Company held marketable securities with maturities up to thirty months.

Inventory: Inventory is stated at the lower of average cost or market and generally consists of raw materials.

Goodwill and Other Intangible Assets: The Company adopted the provisions of Statement of Financial Accounting Standards (SFAS) No. 142, “Goodwill and Other Intangible Assets”, as of January 1, 2002. Pursuant to SFAS No. 142, goodwill and intangible assets acquired in a purchase business combination and determined to have an indefinite useful life are not amortized, but instead tested for impairment at least annually in accordance with the provisions of SFAS No. 142. SFAS No. 142 also requires that intangible assets with estimable useful lives be amortized over their respective estimated useful lives to their estimated residual values, and reviewed for impairment in accordance with SFAS No. 144, “Accounting for Impairment or Disposal of Long-Lived Assets”.

Goodwill represents the excess of costs over fair value of net assets acquired pursuant to the March 25, 2003 merger transaction with H Power Corp. (H Power). Amortized intangible assets, including purchased technology and other intangible assets, are carried at cost less accumulated amortization. The Company amortizes these intangible assets on a straight-line basis over their estimated useful lives. The range of estimated useful lives on the Company’s identifiable intangible assets is two to ten years.

Impairment of Long-Lived Assets: Long-lived assets, such as property, plant, and equipment, and purchased intangibles subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to estimated undiscounted future cash flows expected to be generated by the asset. If the carrying amount of an asset exceeds its estimated future cash flows, an impairment charge is recognized by the amount by which the carrying amount of the asset exceeds the fair value of the asset. Assets to be disposed of would be separately presented in the balance sheet and reported at the lower of the carrying amount or fair value less costs to sell, and are no longer depreciated. The assets and liabilities of a disposed group classified as held for sale would be presented separately in the appropriate asset and liability sections of the balance sheet.

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

The Company’s initial commercial sales for the delivery of fuel cell systems are contract specific arrangements containing multiple obligations, which may include a combination of fuel cell systems, continued service, maintenance and other support, which are limited to a defined operating period that does not extend beyond the stated contractual term, as well as certain cancellation privileges that expire ratably over the stated contractual term. The multiple obligations within the Company’s contractual arrangements are not accounted for separately based on its limited commercial experience and available evidence of fair value. The Company’s contractual arrangements under its initial commercial sales are with a limited number of customers and the arrangements are separately negotiated and not combined. Contract terms on our initial commercial sales require payment upon delivery and installation of the fuel cell system and are not contingent on the achievement of specific milestones or other substantive performance.

The Company defers recognition of product and service revenue as a result of the Company’s continued involvement through service, maintenance and other support and cancellation privileges. Revenue is recognized on a straight line basis over the stated contractual terms, which are generally for periods of six to twelve months as the service, maintenance and other support is provided and the cancellation privileges expire. At June 30, 2004 the Company had deferred product and service revenue in the amount of $5.8 million.

Research and Development Contract Revenue: Research and development contract revenue primarily relates to cost reimbursement research and development contracts associated with the development of PEM fuel cell technology. The Company generally shares in the cost of these programs with cost sharing percentages between 20% and 60%. Revenue from “time and material” contracts is recognized on the basis of hours utilized, plus other reimbursable contract costs incurred during the period. At June 30, 2004, the Company had deferred contract revenue of $719,000.

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Income Taxes: Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. We did not report a benefit for federal and state income taxes in the consolidated financial statements as the deferred tax asset generated from our net operating loss has been offset by a full valuation allowance because it is more likely than not that the tax benefits of the net operating loss carryforward will not be realized.

Stock-Based Compensation: The Company applies the intrinsic value-based method of accounting prescribed by Accounting Principles Board (“APB”) Opinion No. 25, “Accounting for Stock Issued to Employees,” and related interpretations including Financial Accounting Standards Board (“FASB”) Interpretation No. 44, “Accounting for Certain Transactions involving Stock Compensation an interpretation of APB Opinion No. 25”, to account for its fixed plan stock options. Under this method, compensation expense is recorded on the date of grant only if the current market price of the underlying stock exceeded the exercise price. SFAS No. 123, “Accounting for Stock-Based Compensation,” established accounting and disclosure requirements using a fair value-based method of accounting for stock-based employee compensation plans. As allowed by SFAS No. 123, the Company has elected to continue to apply the intrinsic value-based method of accounting described above, and has adopted the disclosure requirements of SFAS No. 123. The following table illustrates the effect on net loss if the fair-value-based method had been applied to all outstanding and unvested awards in each period:

On June 20, 2003, the Company issued 607,804 shares of restricted stock and cancelled 1,810,048 options to purchase common stock in connection with the Company’s offer to eligible employees to exchange options to purchase shares of common stock with an exercise price of $8.53 or greater per share for shares of restricted stock on a three for one basis. The shares of restricted stock received in this exchange will vest in three equal installments effective 21 months, 24 months and 27 months from the date of the exchange. During the three and six month periods ended June 30, 2004, the Company recorded employee compensation expense of $402,000 and $803,000, respectively, relating to the issuance of the restricted stock awards.

Use of Estimates: The unaudited condensed consolidated financial statements of the Company have been prepared in conformity with accounting principles generally accepted in the United States of America, which require 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 financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Impact of Recently Issued Accounting Standards: In March 2004, the Emerging Issues Task Force (EITF) of the Financial Accounting Standards Board (FASB) reached a consensus on and the FASB ratified EITF Issue No. 03-01, “The Meaning of Other-Than-Temporary Impairment and Its Application to Certain Investments” (EITF 03-01). EITF 03-01 provides guidance for evaluating whether an investment is other-than-temporarily impaired and will be applied in other-than-temporary impairment evaluations made by the Company beginning in the third quarter of 2004. The Company believes that the adoption of EITF 03-01 will not have a material effect on the Company.

In March 2004, the EITF reached a consensus on and the FASB ratified EITF Issue No. 03-16, “Accounting for Investments in Limited Liability Companies” (EITF 03-16). The EITF concluded that if investors in a limited liability company have specific ownership accounts, they should follow the guidance prescribed in Statement of Position 78-9, “Accounting for Investments in Real Estate Ventures,” and EITF Topic No. D-46, “Accounting for Limited Partnership Investments.” Otherwise, investors should follow the significant influence model prescribed in Accounting Principles Board Opinion No. 18, “The Equity Method of Accounting for Investments in Common Stock.” EITF 03-16 will be effective for the Company during the third quarter of 2004. The Company believes that the adoption of EITF 03-16 will not have a material effect on the Company.

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Reclassifications: Certain prior year amounts have been reclassified to conform to the 2004 presentation.

3. Loss Per Share

Loss per share for the Company is calculated as follows:

No options or warrants outstanding were included in the calculation of diluted loss per share because their impact would have been anti-dilutive. These dilutive potential common shares at June 30, 2004 and 2003 are summarized as follows:

4. Investments in Affiliates

GE Fuel Cell Systems, LLC

In February 1999, the Company entered into an agreement with GE MicroGen, Inc. to form GE Fuel Cell Systems, LLC (GEFCS), to exclusively market, distribute, install and service certain of its PEM fuel cell systems under 35 kW designed for use in residential, commercial and industrial stationary power applications on a global basis, with the exception of the states of Illinois, Indiana, Michigan and Ohio, in which DTE Energy Technologies, Inc. (“DTE”), has exclusive distribution rights. GE MicroGen, Inc. is a wholly owned subsidiary of General Electric Company that operates within the GE Energy (formerly known as GE Power Systems) business.

In connection with the original formation of GEFCS, we issued 2,250,000 shares of our common stock to GE MicroGen, Inc. in exchange for a 25% interest in GEFCS. We capitalized $11.3 million, the fair value of the shares issued, under the caption “Investment in affiliates” in our consolidated financial statements. We also issued a warrant to GE MicroGen, Inc. to purchase 3,000,000 additional shares of common stock at a price of $12.50 per share. GEFCS exercised this option immediately prior to our initial public offering for a total exercise price of $37.5 million in cash.

In August 2001, we amended our agreements with GE Microgen, Inc. and GEFCS to expand GEFCS’ exclusive worldwide distribution rights to include all of our stationary PEM fuel cell systems. In addition, we increased our ownership interest in GEFCS from 25% to 40% and extended the term of the agreement to December 31, 2014. In return, we granted GE Power Systems Equities, Inc. an option to purchase 725,000 shares of our common stock at any time prior to August 21, 2006 at an exercise price of $15.00 per share. In connection with the amendment, we capitalized $5 million, the fair value of the option to purchase 725,000 shares of Plug Power common stock, under the caption “Investment in affiliates” in our condensed consolidated financial statements.

The Company accounts for its interest in GEFCS on the equity method of accounting and adjusts its investment by its proportionate share of income or losses under the caption “Equity in losses of affiliates” in the accompanying condensed consolidated statements of operations. GEFCS had operating and net income of approximately $14,000 for the three months ending June 30, 2004 and an operating and net loss of approximately $3,000 for the six months ended June 30, 2004. For the three months ended June 30, 2004, equity in losses of affiliates, related to GEFCS, was approximately $434,000 including amortization of the related intangible asset of $448,000. For the six months ended June 30, 2004, equity in losses of affiliates, related to GEFCS, was approximately $899,000 including amortization of the related intangible asset of $896,000.

Under a separate agreement with the General Electric Company, for our product development effort, we have agreed to source technical support services, including engineering, testing, manufacturing and quality control services. Under this agreement, the

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Company has committed to purchase a minimum of $12.0 million of such services over a five year period, which began September 30, 1999. In 2004 the Company and General Electric Company extended this period through September 2007. Through June 30, 2004, the Company had purchased approximately $8.9 million of such services. General Electric Company has agreed to act as the agent in procuring certain equipment, parts and components and is providing training services to our employees regarding procurement activities pursuant to this agreement.

5. Acquisition of H Power Corp.

On March 25, 2003, the Company consummated a merger transaction with H Power, a company also involved in the design, development, and manufacture of PEM fuel cells and fuel cell systems, pursuant to which the Company acquired all of the outstanding shares of H Power in a stock-for-stock exchange. In connection with the transaction, H Power stockholders received 8,950,113 shares of Company’s common stock. In the aggregate, the Company issued 9,063,080 shares of its common stock in connection with the transaction. Immediately following the transaction H Power became a wholly owned subsidiary of the Company.

Effective March 25, 2003, the Company and H Power are treated as a single company for financial reporting purposes and the Company has recorded the fair value of H Power’s net assets on its consolidated financial statements. The historical financial statements of the Company will continue to be the historical financial statements of the combined company for periods prior to the merger. The fair value of the shares issued as a result of the transaction is estimated at approximately $46.3 million. The Company also incurred direct transaction costs of $4.1 million in connection with the transaction. As part of the acquisition, the Company acquired cash, cash equivalents and marketable securities of H Power of approximately $29.6 million, after payment of certain integration costs and expenses associated with the consummation of the merger of approximately $7.1 million which were accounted for as additional purchase price. The Company has recorded approximately $10.4 million of goodwill, which is not deductible for tax purposes, related to the transaction. The Company has included H Power in its consolidated financial position and results of operations since the date of acquisition.

Approximately $3.0 million of the purchase price represents the estimated fair value of acquired in-process research and development projects. As we were not continuing the related development projects, this amount was immediately expensed in the consolidated statement of operations as of the date of acquisition. This write-off is included in in-process research and development expenses on the accompanying condensed consolidated statement of operations for the six months ended June 30, 2003.

6. Goodwill and Other Intangible Assets

The gross carrying amount and accumulated amortization of the Company’s acquired intangible assets as of June 30, 2004 and December 31, 2003 were as follows:

Amortization expense for acquired intangible assets during the three and six months ending June 30, 2004 was $1.1 million and $2.3 million, respectively. Estimated amortization expense for the remainder of 2004 and the four succeeding years is as follows:

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7. Stockholders’ Equity

Changes in stockholders’ equity for the six months ended June 30, 2004 are as follows:

Common stock issued during the six months ended June 30, 2004 consisted of 167,233 shares related to stock based compensation, 92,060 shares related to stock option purchases and 31,631 shares related to the employee stock purchase plan.

8. Commitments and Contingencies

Shareholder Class Action Lawsuit: As previously disclosed, in September 2000, a shareholder class action complaint was filed in the federal district court for the Eastern District of New York alleging that the Company and various of its officers and directors violated certain federal securities laws by failing to disclose certain information concerning the Company’s products and future prospects. The action was brought on behalf of a class of purchasers of our stock who purchased the stock between February 14, 2000 and August 2, 2000. Subsequently, fourteen additional complaints with similar allegations and class periods were filed. By order dated October 30, 2000, the court consolidated the complaints into one action, entitled Plug Power Inc. Securities Litigation, CV-00-5553 (ERK) (RML). By order dated January 25, 2001, the Court appointed lead plaintiffs and lead plaintiffs’ counsel. Subsequently, the plaintiffs served a consolidated amended complaint. The consolidated amended complaint extends the class period to begin on October 29, 1999 and alleges claims under the Securities Act and Exchange Act, and Rule 10b-5 promulgated under the Exchange Act. Subsequently, plaintiffs withdrew their claims under the Securities Act. Plaintiffs allege that the defendants made misleading statements and omissions regarding the state of development of our technology in a registration statement issued in connection with our initial public offering (IPO) and in subsequent press releases. We served our motion to dismiss the claims in May 2001. By order dated January 21, 2003, the Court dismissed all claims relating to pre-IPO press releases, the IPO prospectus and all but three post-IPO press releases. The Court also denied the motion to dismiss the claims against the individual defendants at this time.

In May 2004, the Company reached an agreement in principle to settle the litigation. Pursuant to the settlement, the Company’s primary insurance carrier will fund the settlement. The settlement is subject to negotiation of a final agreement by the parties and approval by the court. The settlement is not anticipated to have any material impact on the Company’s financial condition.

9. Supplemental Disclosures of Cash Flows Information

The following represents required supplemental disclosures of cash flows information and non-cash financing and investing activities which occurred during the six months ended June 30, 2004 and 2003:

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MANAGEMENT’S DISCUSSION AND ANALYSIS OF

FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion should be read in conjunction with our accompanying unaudited condensed consolidated financial statements and notes thereto included within this report, and our audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K filed for the fiscal year ended December 31, 2003 on March 11, 2004. In addition to historical information, this Form 10-Q and following discussion contain statements that are not historical facts and are considered forward-looking within the meaning of the Private Securities Litigation Reform Act of 1995. These forward-looking statements contain projections of our future results of operations or of our financial position or state other forward-looking information. In some cases you can identify these statements by forward-looking words such as “anticipate,” “believe,” “could,” “estimate,” “expect,” “intend,” “may,” “should,” “will” and “would” or similar words. We believe that it is important to communicate our future expectations to our investors. However, there may be events in the future that we are not able to accurately predict or control and that may cause our actual results to differ materially from the expectations we describe in our forward-looking statements. Investors are cautioned not to rely on forward-looking statements because they involve risks and uncertainties, and actual results may differ materially from those discussed as a result of various factors, including, but not limited to: our ability to develop commercially viable on-site energy products; the cost and timing of developing our on-site energy products; market acceptance of our on-site energy products; our reliance on our relationship with certain affiliates of General Electric (GEFCS); our ability to perform on our multi-generation product plan in a manner satisfactory to GEFCS; our ability to manufacture on-site energy products on a large-scale commercial basis; competitive factors, such as price competition and competition from other traditional and alternative energy companies; the cost and availability of components and parts for our on-site energy products; the ability to raise and provide the necessary capital to develop, manufacture and market our on-site energy products; our ability to establish relationships with third parties with respect to product development, manufacturing, distribution and servicing and the supply of key product components; our ability to protect our intellectual property; our ability to lower the cost of our on-site energy products and demonstrate their reliability; the cost of complying with current and future governmental regulations; the impact of deregulation and restructuring of the electric utility industry on demand for our on-site energy products; fluctuations in the trading price and volume of our common stock and other risks and uncertainties discussed, but are not limited to, those set forth under the caption “Factors Affecting Future Results” in our Annual Report on Form 10-K filed for the fiscal year ended December 31, 2003, filed with the Securities and Exchange Commission on March 11, 2004. These forward-looking statements speak only as of the date on which the statements were made and are not guarantees of future performance. Except as may be required by applicable law, we do not undertake or intend to update any forward-looking statements after the date of this Form 10-Q.

Overview

We design and develop on-site energy systems, based on proton exchange membrane fuel cell technology, for energy consumers worldwide. Our architecture-based technology platform includes proprietary proton exchange membrane (PEM) fuel cell and fuel processing technologies, from which we expect to offer multiple products. We are currently developing: (1) backup power products for telecommunications, broadband and industrial uninterruptible power supply (UPS) applications; (2) on-site hydrogen generation for a variety of industrial gas applications; (3) combined heat and power products for remote residential and small commercial applications; and (4) battery-replacement modules for material handling equipment.

Our cash requirements depend on numerous factors, including completion of our product development activities, ability to commercialize our fuel cell systems, market acceptance of our systems and other factors. We expect to pursue the expansion of our operations through internal growth and strategic acquisitions.

We are a development stage enterprise in the beginning stages of field testing and marketing our initial commercial products to a limited number of customers, including telecom, utilities, government entities and our distribution partners. This initial product is a limited edition fuel cell system (System or Unit) that is intended to offer complementary, quality power while demonstrating the market value of fuel cells as a preferred form of alternative distributed power generation. Subsequent enhancements to our Systems are expected to expand the market opportunity for fuel cells by lowering the installed cost, decreasing operating and maintenance costs, increasing efficiency, improving reliability, and adding features such as grid independence and co-generation and uninterruptible power supply (UPS) applications.

Our initial commercial sales are for the delivery of limited edition fuel cell systems and are contract specific arrangements containing multiple obligations, that may include a combination of fuel cell systems, continued service, maintenance and other support, which are limited to a defined operating period, as well as certain cancellation privileges that expire ratably over the stated contractual term. Contract terms on our initial commercial sales require payment upon delivery and installation of the fuel cell system and are not contingent on the achievement of specific milestones or other substantive performance. Under these initial commercial sales, we defer recognition of product and service revenue, as a result of the cancellation privileges, and recognize revenue on a straight line basis as the cancellation privileges expire ratably over the stated contractual term, which are generally for periods of six to twelve months (See Critical Accounting Policies and Estimates - Revenue Recognition).

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As of June 30, 2004, we had unrestricted cash and cash equivalents and marketable securities totaling $82.9 million and working capital of $82.0 million. Additionally, we have restricted cash in the amount of $4.7 million, which was escrowed to collateralize debt associated with the purchase of our facilities in 1999.

During the six months ended June 30, 2004, cash used by operating activities was $18.5 million consisting primarily of a net loss of $23.3 million offset, in part, by non-cash expenses in the amount of $7.2 million, including $2.1 million for amortization and depreciation, $2.3 million for stock based compensation, $1.4 for amortization of intangible assets and $899,000 for equity losses in affiliates. Cash used in investing activities for the six months ended June 30, 2004 was $30.2 million consisting of $29.5 million invested in marketable securities and $708,000 used to purchase property plant and equipment. Cash provided by financing activities was $660,000 consisting primarily of net proceeds from issuance of common stock for stock options exercised during the six months ended June 30, 2004.

We have financed our operations through June 30, 2004 primarily from the sale of equity, which has provided cash in the amount of $349.1 million. Since inception, net cash used in operating activities has been $247.0 million and cash used in investing activities has been $54.9 million, including our purchase of property, plant and equipment of $30.8 million, our investments in marketable securities in the amount of $42.8 million offset, in part, by net proceeds from acquisition of $29.5 million.

Product Development and Commercialization

We are focused on an architecture-based platform approach to product development, with modular, scalable and extensible designs. Our architected technology platform includes proprietary proton exchange membrane (PEM) fuel cell and fuel processing technology, from which we expect to offer multiple products. We are currently developing: (1) backup power products for telecommunications, broadband and industrial UPS applications; (2) on-site hydrogen generation for a variety of industrial gas applications; (3) combined heat and power products for remote residential and small commercial applications; and (4) battery-replacement modules for material handling equipment. We are currently developing the following products:

GenCore^® – Backup Power -The GenCore platform is focused on providing backup, direct-current (DC) power products for telecom, broadband and industrial UPS applications in the range of 2-12 kilowatts. GenCore products are fueled by hydrogen and do not require a fuel processor. In December 2003, we started making initial shipments of our GenCore 5T product.

GenSite^TM – On-Site Hydrogen Generation - We expect to combine our proprietary fuel processor with available commercial components for gas compression, purification and storage to develop GenSite, an on-site hydrogen gas generator. This product is expected to target certain applications now served by packaged gas or electrolyzers.

GenSys^TM – Remote Continuous Power for Light Commercial and Residential - We plan to continue to develop GenSys into a fully architected platform that will support a number of products, including liquefied petroleum gas fueled systems for remote commercial and remote residential applications, and eventually grid-connected light commercial and residential applications. In July 2003, we delivered our first fuel cell system, fueled by liquefied petroleum gas, the GenSys 5P. The GenSys5P is being marketed to rural electric cooperatives, propane dealers and federal and state government agencies that require the remote fuel capability provided by LPG.

GenDrive^TM – Battery Replacement for Material Handling - The GenCore platform is expected to provide the basis for our development of the GenDrive product, a hydrogen-fueled battery-replacement module for material handling equipment. GenDrive is expected to bring value to large distribution centers by freeing expensive floor space from the re-charging infrastructure currently required to support batteries and by reducing the frequency of recharging/refueling. We expect GenDrive to maintain a higher state of charge in the equipment during operation than the batteries that are used today, allowing for greater productivity.

Home Energy Station – We are also currently developing technology in support of the automotive fuel cell market. In collaboration with Honda R&D Co. Ltd. of Japan (“Honda”), a subsidiary of Honda Motor Co., Ltd., we are developing a home refueling system that is expected to provide heat, hot water and electricity to the home, while also providing hydrogen to fuel a fuel cell vehicle. The companies completed the first phase of the agreement in October 2003 with the successful demonstration of a prototype Home Energy Station at Honda R&D Americas’ facility in Torrance, California. The work under the second phase of the project started in March 2004 and is focused on developing a next-generation prototype of the Home Energy Station. As in the first phase, Honda R&D of Japan is funding Plug Power’s work under this new agreement.

Strategic Relationships and Development Agreements

Since our inception, we have formed strategic relationships with suppliers of key components, developed distributor and customer relationships, and entered into development and demonstration programs with electric utilities, government agencies and

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other energy providers. We continue to maintain key relationships as part of our “extended enterprise” strategy. These relationships include distribution, marketing, and technology partnerships with companies such as GE, Honda, Vaillant, Pemeas Gmbh (Pemeas), Engelhard and DTE Energy and strategic relationships with supply chain partners, including 3M, Dana, Toyo, Entegris, Parker and Arvin Meritor. Some of these relationships are described in greater detail below.

GE Entities: In February 1999, the Company entered into an agreement with GE MicroGen, Inc. to form GE Fuel Cell Systems, LLC (GEFCS), to exclusively market, distribute, install and service certain of its PEM fuel cell systems under 35 kW designed for use in residential, commercial and industrial stationary power applications on a global basis, with the exception of the states of Illinois, Indiana, Michigan and Ohio, in which DTE Energy Technologies, Inc., has exclusive distribution rights. GE MicroGen, Inc. is a wholly owned subsidiary of General Electric Company that operates within the GE Energy (formerly known as GE Power Systems) business.

In connection with the original formation of GEFCS, we issued 2,250,000 shares of our common stock to GE MicroGen, Inc. in exchange for a 25% interest in GEFCS. We capitalized $11.3 million, the fair value of the shares issued, under the caption “Investment in affiliates” in our consolidated financial statements. We also issued a warrant to GE MicroGen, Inc. to purchase 3,000,000 additional shares of common stock at a price of $12.50 per share. GEFCS exercised this option immediately prior to our initial public offering for a total exercise price of $37.5 million in cash.

In August 2001, we amended our agreements with GE Microgen, Inc. and GEFCS to expand GEFCS’ exclusive worldwide distribution rights to include all of our stationary PEM fuel cell systems. In addition, we increased our ownership interest in GEFCS from 25% to 40% and extended the term of the agreement to December 31, 2014. In return, we granted GE Power Systems Equities, Inc. an option to purchase 725,000 shares of our common stock at any time prior to August 21, 2006 at an exercise price of $15.00 per share. In connection with the amendment, we capitalized $5 million, the fair value of the option to purchase 725,000 shares of Plug Power common stock, under the caption “Investment in affiliates” in our condensed consolidated financial statements.

The Company accounts for its interest in GEFCS on the equity method of accounting and adjusts its investment by its proportionate share of income or losses under the caption “Equity in losses of affiliates” in the accompanying condensed consolidated statements of operations. GEFCS had operating and net income of approximately $14,000 for the three months ending June 30, 2004 and operating and net loss of approximately $4,000 for the six months ended June 30, 2004. For the three months ended June 30, 2004, equity in losses of affiliates, related to GEFCS, was approximately $434,000 including amortization of the related intangible asset of $448,000. For the six months ended June 30, 2004, equity in losses of affiliates, related to GEFCS, was approximately $899,000 including amortization of the related intangible asset of $896,000.

Under a separate agreement with the General Electric Company, for our product development effort, we have agreed to source technical support services, including engineering, testing, manufacturing and quality control services. Under the initial agreement, the Company was committed to purchase a minimum of $12.0 million of such services over a five year period, which began September 30, 1999. In 2004 the Company and General Electric Company extended this period through September 2007. Through June 30, 2004, the Company had purchased approximately $8.9 million of such services. General Electric Company has agreed to act as the agent in procuring certain equipment, parts and components and is providing training services to our employees regarding procurement activities pursuant to this agreement.

Honda: We have an agreement with Honda to exclusively and jointly develop and test a fuel cell system that provides electricity and heat to a home or business, while also providing hydrogen fuel for a fuel cell vehicle (the “Home Energy Station”). In October 2003, we successfully demonstrated a prototype Home Energy Station at Honda R&D Americas’ facility in Torrance, California. In March 2004 we amended our agreement with Honda to provide for the second phase of an expected multi-phase product development effort. The work under the second phase of the project is focused on developing a next-generation prototype of the Home Energy Station. As in the first phase, Honda R&D of Japan is funding Plug Power’s work under this new agreement.

Vaillant: We have a development agreement with Vaillant GmbH (Vaillant), to develop a combination furnace, hot water heater and fuel cell system that is expected to provide both heat and electricity for the home. Under the agreement, we will sell fuel cell subsystems directly and exclusively to Vaillant and Vaillant will distribute fuel cell heating appliances throughout Europe on a non-exclusive basis. In exchange for the right to sell fuel cell subsystems directly and exclusively to Vaillant, we have agreed to pay GE MicroGen, Inc. a commission, based on a prescribed percentage of sales of fuel cell subsystems (as defined in the agreement).

Pemeas: We have a joint development agreement with Pemeas (effective April 1, 2004, the fuel cell activity of Celanese AG and former Hoechst AG was formed into a new company, Pemeas GmbH), to develop, on an exclusive basis, a high temperature membrane electrode unit for stationary fuel cell systems with net electrical output of 750 watts up to 25 kilowatts. Additionally, we have the option to work with Pemeas on a non-exclusive basis to develop a high-temperature membrane electrode unit for stationary fuel cell systems with net electrical output of less than 750 watts and greater than 25 kilowatts. Under the agreement, the Company and Pemeas will each fund their own development efforts.

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Engelhard: We have a joint development agreement and a supply agreement with Engelhard Corporation for development and supply of advanced catalysts to increase the overall performance and efficiency of our fuel processor. Over the course of the joint development agreement we have contributed $10.0 million to fund Engelhard’s development efforts and in turn Engelhard has purchased $10.0 million of our common stock. As of June 30, 2004 all funding obligations related to development efforts have been met and the Company and Engelhard will each fund their own development efforts. Additionally, a supply agreement with Engelhard specifies the rights and obligations for Engelhard to supply products to us until 2013.

DTE Energy: We have an exclusive distribution agreement with DTE Energy Technologies, Inc. for the states of Michigan, Ohio, Illinois, and Indiana. Under the agreement we can sell directly or negotiate nonexclusive distribution rights to third parties for our GenCore backup power product line, and our GenSite hydrogen generation product line. Starting in the fourth quarter of 2004 for GenCore and in the fourth quarter of 2005 for GenSite, we have agreed to pay a 5% commission to DTE Energy Technologies, Inc., based on sales price of units shipped to the above noted states. The distribution agreement expires on December 31, 2014.

Results of Operations

Comparison of the Three Months Ended June 30, 2004 and June 30, 2003.

Product and service revenue. Under our initial commercial sales we defer recognition of product and service revenue at the time of shipment and recognize revenue on a straight line basis as certain cancellation provisions expire, which are generally over periods of six to twelve months. These initial sales are contract-specific arrangements containing multiple obligations, which may include a combination of fuel cell systems, continued service, maintenance and other support, and which are limited to a defined operating period that does not extend beyond the stated contractual term, as well as certain cancellation privileges that expire ratably over the stated contractual term. Contract terms on our initial commercial sales require payment upon delivery and installation of the fuel cell system and are not contingent on the achievement of specific milestones or other substantive performance. The costs associated with the product, service and other obligations are expensed as they are incurred.

During the three months ended June 30, 2004, we delivered 55 fuel cell systems. The revenue associated with 44 of these systems is related to product and service arrangements. Accordingly, under our accounting policy for product and service revenue, we have deferred revenue on these 44 systems which will be recognized over the stated contractual term. The associated cost of the 44 fuel cell systems shipped to customers were included in cost of product and service revenue. The remaining 11 fuel cell systems were shipped under a government contract and the associated revenue is included in research and development contract revenue while the associated costs are included in cost of research and development contract revenue in the accompanying condensed consolidated statement of operations for the period ended June 30, 2004.

We invoiced $2.2 million for the 44 systems shipped under product and service arrangements during the three months ended June 30, 2004, compared to $2.5 million for the 35 fuel cell systems shipped during the same period in 2003. The decrease in the amount invoiced is a result of an increased proportion of our shipments coming from our GenCore product which has a lower average selling price per unit than our GenSys product (see Product Development and Commercialization). During the quarter ended June 30, 2004, we recognized product and service revenue of $1.5 million, of which $1.1 million was deferred at December 31, 2003, compared to $2.1 million during the same quarter last year, substantially all of which was deferred at December 31, 2002.

At June 30, 2004, we had total deferred revenue in the amount of $6.5 million of which we expect to recognize approximately $4.6 million through the remainder of 2004.

Research and development contract revenue. Research and development contract revenue increased to $2.2 million for the three months ended June 30, 2004 from $959,000 during the same period last year. The increase is due to the addition of development agreements with the U.S. Department of Energy, the New York State Energy Research and Development Authority and Honda R&D Co., Ltd. of Japan. Research and development contract revenue primarily relates to cost reimbursement research and development contracts associated with the development of PEM fuel cell technology. We generally share in the cost of these programs with cost sharing percentages between 20% and 60%. Revenue from “time and material” contracts is recognized on the basis of hours utilized, plus other reimbursable contract costs incurred during the period. We expect to continue certain research and development contract work that is directly related to our current product development efforts.

Cost of product and service revenue. Cost of product and service revenue decreased to $1.8 million for three months ended June 30, 2004 from $2.1 million for three months ended June 30, 2003. Cost of product and service revenue includes the direct material cost incurred in the manufacture of the products we sell, as well as the labor and material costs incurred for product maintenance, replacement parts and service under our contractual obligations. These costs consist primarily of production materials and fees paid to outside suppliers for subcontracted components and services.

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Cost of research and development contract revenue. Cost of research and development contract revenue increased to $3.1 million for three months ended June 30, 2004 from $1.3 million for three months ended June 30, 2003. The increase in these costs related to the additional development agreements described above under research and development contract revenue. Cost of research and development contract revenue includes costs associated with research and development contracts including: compensation and benefits for engineering and related support staff, fees paid to outside suppliers for subcontracted components and services, fees paid to consultants for services provided, materials and supplies used and other directly allocable general overhead costs allocated to specific research and development contracts.

Noncash research and development expense. Noncash research and development expense for the three months ended June 30, 2004, increased to $521,000 from $289,000 during the same period last year. Noncash research and development expense represents the fair value of stock grants and vested stock options to employees, consultants and others in exchange for services provided. The increase is primarily the result of stock based compensation associated with the amortization of restricted stock issued in June 2003 under our employee stock option exchange program.

Other research and development expense. Other research and development expense was $7.3 million for the three months ended June 30, 2004 compared to $10.1 million for the three months ended June 30, 2003. Research and development expense includes: materials to build development and prototype units, compensation and benefits for the engineering and related staff, expenses for contract engineers, fees paid to outside suppliers for subcontracted components and services, fees paid to consultants for services provided, materials and supplies consumed, facility related costs such as computer and network services and other general overhead costs. Our approach to the design of our next generation fuel cell system uses advanced modeling and system simulation techniques, which result in lower research and development costs because we build fewer systems for internal test and evaluation.

For the quarter ended June 30, 2004, other research and development expense also includes amortization of prepaid development costs in the amount of $350,000 under our joint development program with Engelhard, recorded on our balance sheet under the caption “Prepaid development costs” and amortization in the amount of $688,000 related to the portion of the H Power purchase price which has been capitalized and recorded on our balance sheet under the caption “Intangible assets”. During the same period last year, other research and development expense included amortization of prepaid development costs in the amount of $408,000 under our joint development program with Engelhard and amortization in the amount of $688,000 related to the portion of the H Power purchase price which had been capitalized and recorded on our balance sheet under the caption “Intangible assets”.

Noncash general and administrative expense. Noncash general and administrative expenses for the three months ended June 30, 2004 increased to $479,000 from $84,000 for the three months ended June 30, 2003. Noncash general and administrative expense represents the fair value of stock grants and vested stock options to employees, consultants and others in exchange for services provided. The increase is primarily the result of stock based compensation associated with the amortization of restricted stock issued in June 2003 under our employee stock option exchange program

Other general and administrative expense. Other general and administrative expense was $1.8 million for the three month periods ended June 30, 2004 and 2003. Other general and administrative expense includes compensation, benefits and related costs in support of our general corporate functions including general management, finance and accounting, human resources, marketing, information technology and legal services.

Interest income. Interest income consisting of interest earned on our cash, cash equivalents and marketable securities increased to $442,000 for the three months ended June 30, 2004, from $191,000 for the same period in 2003. The increase was due to an increase in our investment portfolio for funds received as a result of our public offering of equity in November 2003.

Interest expense. Interest expense was $10,000 for the three months ended June 30, 2004, compared to $16,000 for the same period last year. Interest expense consists of interest on our long-term obligation related to the purchase of real estate and interest paid on capital lease obligations.

Equity in losses of affiliates. Equity in losses of affiliates decreased to $434,000 for the three months ended June 30, 2004 from $480,000 during the same period last year. Equity in losses of affiliates, which we account for under the equity method of accounting, is our proportionate share of income of GE Fuel Cell Systems in the amount of $14,000 offset by amortization of our original investments in the amount of $448,000.

Income taxes. We did not report a benefit for federal and state income taxes in the consolidated financial statements as the deferred tax asset generated from our net operating loss has been offset by a full valuation allowance because it is more likely than not that the tax benefits of the net operating loss carryforward will not be realized.

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Comparison of the Six Months Ended June 30, 2004 and June 30, 2003.

Product and service revenue. During the six months ended June 30, 2004, we delivered 79 fuel cell systems. The revenue associated with 68 of these systems is related to product and service arrangements. Accordingly, under our accounting policy for product and service revenue, we have deferred revenue on these 68 systems which will be recognized over the stated contractual term. The associated cost of the 68 fuel cell systems shipped to customers were included in cost of product and service revenue. The remaining 11 fuel cell systems were shipped under a government contract and the associated revenue is included in research and development contract revenue while the associated costs are included in cost of research and development contract revenue in the accompanying condensed consolidated statement of operations for the period ended June 30, 2004.

We invoiced $2.6 million for the 68 systems shipped to customers as compared to $2.8 million for the 41 fuel cell systems shipped during the same period 2003. The decrease in the amount invoiced is the result of an increased proportion of our shipments coming from our GenCore product which has a lower average selling price per unit than our GenSys product (see Product Development and Commercialization). During the six months ended June 30, 2004, we recognized product and service revenue of $2.9 million, of which $2.4 million was deferred at December 31, 2003, compared to $4.2 million during the same period last year, substantially all of which was deferred at December 31, 2002.

At June 30, 2004, we had total deferred revenue in the amount of $6.5 million of which we expect to recognize approximately $4.6 million through the remainder of 2004.

Research and development contract revenue. Research and development contract revenue increased to $4.1 million for the six months ended June 30, 2004 from $1.9 million during the same period last year. The increase is due to the addition of development agreements with the U.S. Department of Energy, the New York State Energy Research and Development Authority and Honda R&D Co., Ltd. of Japan. Research and development contract revenue primarily relates to cost reimbursement research and development contracts associated with the development of PEM fuel cell technology. We generally share in the cost of these programs with cost sharing percentages between 20% and 60%. Revenue from “time and material” contracts is recognized on the basis of hours utilized, plus other reimbursable contract costs incurred during the period. We expect to continue certain research and development contract work that is directly related to our current product development efforts.

Cost of product and service revenue. Cost of product and service revenue was $2.6 million for the six month periods ended June 30, 2004 and 2003. Cost of product and service revenue includes the direct material cost incurred in the manufacture of the products we sell, as well as the labor and material costs incurred for product maintenance, replacement parts and service under our contractual obligations. These costs consist primarily of production materials and fees paid to outside suppliers for subcontracted components and services.

Cost of research and development contract revenue. Cost of research and development contract revenue increased to $5.7 million for the six months ended June 30, 2004 from $2.5 million for the six months ended June 30, 2003. The increase in these costs relates primarily to the additional development agreements described above under research and development contract revenue. Cost of research and development contract revenue includes costs associated with research and development contracts including: compensation and benefits for engineering and related support staff, fees paid to outside suppliers for subcontracted components and services, fees paid to consultants for services provided, materials and supplies used and other directly allocable general overhead costs allocated to specific research and development contracts.

In-process research and development expense. In-process research and development expense of $3.0 million for the six months ended June 30, 2003 represents the write-off of in-process research and development expense related to the acquisition of intellectual property and certain other assets acquired as a result of our merger with H Power. The amount attributable to in-process research and development was determined using an income approach which reflects the present value of future avoided costs that would otherwise have been spent to acquire the exclusive rights to this technology. The net avoided cost is discounted using a 20% discount rate, which is believed to be consistent with the risk associated with this early stage technology. This amount was further adjusted to reflect the technology’s state of completion in order to reflect the fair value of the in-process research and development attributable to the efforts of the seller up to the date of the transaction.

Noncash research and development expense. Noncash research and development expense for the six months ended June 30, 2004, increased to $995,000 from $515,000 during the same period last year. Noncash research and development expense represents the fair value of stock grants and vested stock options to employees, consultants and others in exchange for services provided. The increase is primarily the result of stock based compensation associated with the amortization of restricted stock issued in June 2003 under our employee stock option exchange program.

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Other research and development expense. Other research and development expense was $16.6 million for the six months ended June 30, 2004 compared to $20.0 million for the six months ended June 30, 2003. Research and development expense includes: materials to build development and prototype units, compensation and benefits for the engineering and related staff, expenses for contract engineers, fees paid to outside suppliers for subcontracted components and services, fees paid to consultants for services provided, materials and supplies consumed, facility related costs such as computer and network services and other general overhead costs. Our approach to the design of our next generation fuel cell system uses advanced modeling and system simulation techniques, which result in lower research and development costs because we build fewer systems for internal test and evaluation.

For the six months ended June 30, 2004, other research and development expense also includes amortization of prepaid development costs in the amount of $708,000 under our joint development program with Engelhard, recorded on our balance sheet under the caption “Prepaid development costs” and amortization in the amount of $1.4 million related to the portion of the H Power purchase price which has been capitalized and recorded on our balance sheet under the caption “Intangible assets”. During the same period last year, other research and development expense included amortization of prepaid development costs in the amount of $772,000 under our joint development program with Engelhard, amortization in the amount of $515,000 related to our purchase of certain fuel processing assets and intellectual property from Gastec and $688,000 related to the portion of the H Power purchase price that has been capitalized. Gastec was fully expensed as of March 31, 2003.

Noncash general and administrative expense. Noncash general and administrative expenses for the six months ended June 30, 2004 increased to $731,000 from $105,000 for the six months ended June 30, 2003. Noncash general and administrative expense represents the fair value of stock grants and vested stock options to employees, consultants and others in exchange for services provided. The increase is primarily the result of stock based compensation associated with the amortization of restricted stock issued in June 2003 under our employee stock option exchange program.

Other general and administrative expense. Other general and administrative expense was $3.5 million for the six months ended June 30, 2004 compared to $3.3 million for the same period last year. Other general and administrative expense includes compensation, benefits and related costs in support of our general corporate functions including general management, finance and accounting, human resources, marketing, information technology and legal services.

Interest income. Interest income consisting of interest earned on our cash, cash equivalents and marketable securities increased to $809,000 for the six months ended June 30, 2004, from $393,000 for the same period in 2003. The increase was due to an increase in our investment portfolio for funds received as a result of our March 2003 acquisition of H Power and our public offering of equity in November 2003.

Interest expense. Interest expense was $25,000 for the six months ended June 30, 2004, compared to $33,000 for the same period last year. Interest expense consists of interest on our long-term obligation related to the purchase of real estate and interest paid on capital lease obligations.

Equity in losses of affiliates. Equity in losses of affiliates decreased to $899,000 for the six months ended June 30, 2004 from $965,000 during the same period last year. Equity in losses of affiliates, which we account for under the equity method of accounting, is our proportionate share of the losses of GE Fuel Cell Systems in the amount of $3,000 and amortization of our original investments in the amount of $896,000.

Income taxes. We did not report a benefit for federal and state income taxes in the consolidated financial statements as the deferred tax asset generated from our net operating loss has been offset by a full valuation allowance because it is more likely than not that the tax benefits of the net operating loss carryforward will not be realized.

Critical Accounting Policies and Estimates

The preparation of financial statements in conformity with generally accepted accounting principles and related disclosure requires management to make estimates and assumptions that affect:

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Specifically, we must use estimates in determining the economic useful lives of assets, including identifiable intangibles, and various other recorded or disclosed amounts. Therefore, our financial statements and related disclosure are necessarily affected by these estimates. We evaluate these estimates on an ongoing basis, utilizing historical experience and other methods considered reasonable in the particular circumstances. Nevertheless, actual results may differ significantly from estimates. To the extent that actual outcomes differ from estimates, or additional facts and circumstances cause management to revise estimates, our financial position as reflected in its financial statements will be affected. Any effects on business, financial position or results of operations resulting from revisions to these estimates are recorded in the period in which the facts that give rise to the revision become known.

We believe that the following are our most critical accounting policies affected by the estimates and assumptions the Company must make in the preparation of its financial statements and related disclosure:

Revenue recognition: We are a development stage enterprise in the beginning stages of field testing and marketing our initial commercial products to a limited number of customers, including telecom, utilities, government entities and our distribution partners. This initial product is a limited edition fuel cell system (System or Unit) that is intended to offer complementary, quality power while demonstrating the market value of fuel cells as a preferred form of alternative distributed power generation. Subsequent enhancements to our Systems are expected to expand the market opportunity for fuel cells by lowering the installed cost, decreasing operating and maintenance costs, increasing efficiency, improving reliability, and adding features such as grid independence and co-generation and uninterruptible power supply (UPS) applications.

We apply the guidance within Staff Accounting Bulletin No. 104, “Revenue Recognition in Financial Statements” (SAB 104) to our initial sales contracts to determine when to properly recognize revenue. Our initial commercial sales for the delivery of limited edition fuel cell systems are contract specific arrangements containing multiple obligations, that may include a combination of fuel cell systems, continued service, maintenance and other support, which are limited to a defined operating period that does not extend beyond the stated contractual term, as well as certain cancellation privileges that expire ratably over the stated contractual term. The multiple obligations within our contractual arrangements are not accounted for separately based on our limited commercial experience and available evidence of fair value. Contract terms on our initial commercial sales require payment upon delivery and installation of the fuel cell system and are not contingent on the achievement of specific milestones or other substantive performance. Under these initial commercial sales, we defer recognition of product and service revenue, as a result of the cancellation privileges, and recognize revenue on a straight line basis as the cancellation privileges expire ratably over the stated contractual term, which are generally for periods of six to twelve months.

As we gain commercial experience, including field experience relative to service and warranty based on the sales of our initial products, the fair values for the multiple elements within our future contracts may become determinable and we may, in future periods, recognize revenue upon delivery of the Unit or we may continue to defer recognition, based on application of appropriate guidance within EITF 00-21, “Accounting for Revenue Arrangements with Multiple Deliverables”, or change in the manner we structure contractual agreements, including our agreements with distribution partners.

Valuation of long-lived assets: We assess the impairment of identifiable intangible, long-lived assets and goodwill, if any, whenever events or changes in circumstances indicate that the carrying value may not be recoverable. Factors we consider important which could trigger an impairment review include, but are not limited to, the following:

When we determine that the carrying value of intangible, long-lived assets and goodwill, if any, may not be recoverable based upon the existence of one or more of the above indicators of impairment, we would measure any impairment based upon the provisions of Statement of Financial Accounting Standards (SFAS) No. 142, “Goodwill and Other Intangible Assets” and SFAS No. 144, “Accounting for the Impairment or Disposal of Long-Lived Assets”, as appropriate. Any resulting impairment loss could have a material adverse impact on our financial condition and results of operations.

Accounting for income taxes: As part of the process of preparing our consolidated financial statements, we are required to estimate our income taxes in each of the jurisdictions in which we operate. This process involves the estimation of our actual current tax exposure together with assessing temporary differences resulting from differing treatment of items for tax and accounting

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purposes. Included in this assessment is the determination of the future tax benefit of the net operating loss carryforward that has resulted from our cumulative net operating losses since inception. These differences result in a net deferred tax asset. We must assess the likelihood that our deferred tax assets will be recovered from future taxable income and to the extent that we believe that recovery is not likely, we must establish a valuation allowance. To the extent we establish a valuation allowance or increase this allowance in a period, we must include an expense within the tax provision in the consolidated statement of operations.

Significant management judgment is required in determining our provision for income taxes, our deferred tax assets and liabilities and any valuation allowance recorded against our net deferred tax assets. We recorded a valuation allowance due to uncertainties related to our ability to utilize the net deferred tax assets, primarily consisting of net operating losses and credits which may be carried forward, before they expire. In the event that actual results differ from these estimates or we adjust these estimates in future periods, we may need to adjust the recorded valuation allowance which could materially impact our financial position and results of operations. At June 30, 2004, our net deferred tax assets have been offset in full by a valuation allowance. As a result the net provision for income taxes is zero for the three and six months ended June 30, 2004.

Liquidity and Capital Resources

Our cash requirements depend on numerous factors, including completion of our product development activities, ability to commercialize our on-site energy products, market acceptance of our systems and other factors. We expect to devote substantial capital resources to continue our development programs directed at commercializing our on-site energy products for worldwide use, hiring and training our production staff, developing and expand our manufacturing capacity, continue expanding our production and our research and development activities. We expect to pursue the expansion of our operations through internal growth and strategic acquisitions and expect that such activities will be funded from existing cash and cash equivalents, issuance of additional equity or debt securities or additional borrowings subject to market and other conditions. The failure to raise the funds necessary to finance our future cash requirements or consummate future acquisitions could adversely affect our ability to pursue our strategy and could negatively affect our operations in future periods. We anticipate incurring substantial additional losses over at least the next several years and believe that our current cash, cash equivalents and marketable securities balances will provide sufficient capital to fund operations for at least the next twelve months.

Several key indicators of liquidity are summarized in the following table:

During the six months ended June 30, 2004, the Company used $18.5 million in net cash for operating activities consisting primarily of a net loss of $23.3 million offset by; non-cash expenses in the amount of $7.3 million, including; $2.1 million for amortization and depreciation, $2.3 million for stock based compensation, $1.4 for amortization of intangible assets and $899,000 million for equity losses in affiliates. Changes in operating assets and liabilities consumed $2.5 million in cash for operating activities.

During the six months ended June 30, 2004, the Company also used $30.2 million in net cash for investing activities consisting of $29.5 million for the purchase of marketable securities and $708,000 for the purchase of property, plant and equipment. Net cash provided by financing activities was $660,000 consisting primarily of net proceeds from the issuance of common stock in connection with stock options exercised during the six months ended June 30, 2004.

Since inception, net cash used in operating activities has been $247.0 million and cash used in investing activities has been $54.9 million, including our purchase of property, plant and equipment in the amount of $30.8 million, our investments in marketable securities in the amount of $42.8 million and offset, in part, by our net proceeds from acquisition of $29.5 million.

From inception through June 30, 2004, our stockholders in the aggregate have contributed $349.1 million in cash, including $93.0 million in net proceeds from our initial public offering and $106.6 million in net proceeds from our follow-on public offerings. Additionally, in the first quarter of 2003, we issued approximately 9.0 million shares of common stock in connection with a merger transaction with H Power Corp. which increased our consolidated cash, cash equivalents and marketable securities by approximately $29.5 million, after payment of certain integration costs and expenses associated with the consummation of the merger of approximately $7.1 million.

From inception through June 30, 2004, we have incurred losses of $331.9 million and expect to continue to incur losses as we continue our product development and commercialization programs and prepare for the commencement of manufacturing operations. We expect that losses will fluctuate from quarter to quarter and that such fluctuations may be substantial as a result of, among other factors, the number of systems we produce and install, the cost and sales price of such systems, the related service requirements necessary to maintain those systems and potential design changes required as a result of field testing.

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ITEM 3—QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

We invest our excess cash in government, government backed and interest-bearing investment-grade securities that we generally hold for the duration of the term of the respective instrument. We do not utilize derivative financial instruments, derivative commodity instruments or other market risk sensitive instruments, positions or transactions in any material fashion. Accordingly, we believe that, while the investment-grade securities we hold are subject to changes in the financial standing of the issuer of such securities, we are not subject to any material risks arising from changes in interest rates, foreign currency exchange rates, commodity prices, equity prices or other market changes that affect market risk sensitive instruments.

ITEM 4—CONTROLS AND PROCEDURES

(a) Evaluation of disclosure controls and procedures

As required by Rule 13a-15(b) under the Securities and Exchange Act of 1934, our management, including the Chief Executive Officer and Chief Financial Officer, conducted an evaluation as of the end of the period covered by this report, of the effectiveness of the Company’s disclosure controls and procedures as defined in Exchange Act Rule 13a-15(e). Based on that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that the Company’s disclosure controls and procedures were effective as of the end of the period covered by this report.

(b) Changes in internal controls over financial reporting

As required by Rule 13a-15(d) under the Securities Exchange Act of 1934, our management, including the Chief Executive Officer and Chief Financial Officer, also conducted an evaluation of the Company’s internal control over financial reporting to determine whether any changes occurred during the period covered by this report that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting. Based on that evaluation, there has been no such change during the period covered by this report.

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PART II—OTHER INFORMATION

ITEM 1—LEGAL PROCEEDINGS

Shareholder Class Action Lawsuit: As previously disclosed, in September 2000, a shareholder class action complaint was filed in the federal district court for the Eastern District of New York alleging that we and various of our officers and directors violated certain federal securities laws by failing to disclose certain information concerning our products and future prospects. The action was brought on behalf of a class of purchasers of our stock who purchased the stock between February 14, 2000 and August 2, 2000. Subsequently, fourteen additional complaints with similar allegations and class periods were filed. By order dated October 30, 2000, the court consolidated the complaints into one action, entitled Plug Power Inc. Securities Litigation, CV-00-5553(ERK)(RML). By order dated January 25, 2001, the Court appointed lead plaintiffs and lead plaintiffs’ counsel. Subsequently, the plaintiffs served a consolidated amended complaint. The consolidated amended complaint extends the class period to begin on October 29, 1999 and alleges claims under the Securities Act and Exchange Act, and Rule 10b-5 promulgated under the Exchange Act. Subsequently, plaintiffs withdrew their claims under the Securities Act. Plaintiffs allege that the defendants made misleading statements and omissions regarding the state of development of our technology in a registration statement issued in connection with our initial public offering (IPO) and in subsequent press releases. We served our motion to dismiss the claims in May 2001. By order dated January 21, 2003, the Court dismissed all claims relating to pre-IPO press releases, the IPO prospectus and all but three post-IPO press releases. The Court also denied the motion to dismiss the claims against the individual defendants at this time.

In May 2004, the Company reached an agreement in principle to settle the litigation. Pursuant to the settlement, the Company’s primary insurance carrier will fund the settlement. The settlement is subject to negotiation of a final agreement by the parties and approval by the court. The settlement is not anticipated to have any material impact on the Company’s financial condition.

ITEM 2—CHANGES IN SECURITIES AND USE OF PROCEEDS

During the six months ended June 30, 2004, we issued 57,833 shares of our common stock in connection with matching contributions under our 401(k) Savings & Retirement Plan. The issuance of these shares is exempt from registration under Section 3(a)(2) of the Securities Act of 1933, as amended.

ITEM 4—SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

At the Company’s Annual Meeting of Shareholders (“Annual Meeting”) held on May 20, 2004, our shareholders approved the following:

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ITEM 6—EXHIBITS AND REPORTS ON FORM 8-K

A) Exhibits.

B) Reports on Form 8-K.

On May 19, 2004, we filed a report under item 5 the issuance of a press release announcing that an agreement has been reached in the shareholders class action lawsuit commenced against the Company and certain of its offices and directors in August 2000.

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Signatures

Pursuant to 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.

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