AMERESCO, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

(Unaudited)

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

1. DESCRIPTION OF BUSINESS

Ameresco, Inc. (including its subsidiaries, the “Company”) was organized as a Delaware corporation on April 25, 2000. The Company is a provider of energy efficiency solutions for facilities throughout North America. The Company provides solutions, both products and services, that enable customers to reduce their energy consumption, lower their operating and maintenance costs and realize environmental benefits. The Company’s comprehensive set of services includes upgrades to a facility’s energy infrastructure and the construction and operation of small-scale renewable energy plants. It also sells certain photovoltaic (“PV”) equipment worldwide. The Company operates in the United States, Canada and Europe.

The Company is compensated through a variety of methods, including: 1) direct payments based on fee-for-services contracts (utilizing lump-sum or cost-plus pricing methodologies); 2) the sale of energy from the Company’s generating assets; and 3) direct payment for photovoltaic equipment and systems.

The condensed consolidated financial statements as of June 30, 2014 , and for the six months ended June 30, 2014 and 2013 , are unaudited. In addition, certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) have been condensed or omitted. The interim condensed consolidated financial statements reflect all adjustments that are, in the opinion of management, necessary for a fair presentation in conformity with GAAP. The interim condensed consolidated financial statements, and notes thereto, should be read in conjunction with the audited consolidated financial statements for the year ended December 31, 2013 , and notes thereto, included in the Company’s annual report on Form 10-K for the year ended December 31, 2013 filed with the Securities and Exchange Commission on March 17, 2014 . The results of operations for the interim periods should not be considered indicative of results to be expected for the full year.

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Reclassification

During the fourth quarter of 2013, the Company changed the manner in which advances received from third-party investors under agreements to finance certain energy savings performance contract (“ESPC”) projects with various Federal Government agencies were classified in the consolidated statements of cash flows. The Company concluded that as the transfers of receivables under these agreements do not qualify for sales accounting under accounting standards codification (“ASC”) 860, Transfers and Servicing , until final customer acceptance of the work, the advances from the investors would be better classified as financing cash flows rather than operating cash flows where they had been previously presented. The use of the cash received under these arrangements to pay project costs will continue to be classified as operating cash flows. Due to the manner in which the energy savings performance contracts with the investors are structured, operating cash flows now only reflect the ESPC contract expenditure outflows and do not reflect any inflows from the corresponding contract revenues. Upon acceptance of the project by the Federal customer the ESPC receivable and corresponding ESPC liability are removed from the Company’s consolidated balance sheet as a non-cash settlement.

The following is a summary of the impact of the change on the previously reported amounts in the consolidated statements of cash flows:

Principles of Consolidation

The accompanying condensed consolidated financial statements include the accounts of Ameresco, Inc., its wholly owned subsidiaries and one subsidiary for which there is a minority shareholder. All significant intercompany accounts and transactions have been eliminated. Gains and losses from the translation of all foreign currency financial statements are recorded in accumulated other comprehensive income within stockholders’ equity. The Company prepares its financial statements in conformity with GAAP.

Use of Estimates

GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. The most significant estimates and assumptions used in these condensed consolidated financial statements relate to management’s estimates of final construction contract profit in accordance with accounting for long-term contracts, allowance for doubtful accounts, inventory reserves, project development costs, fair value of derivative financial instruments and stock-based awards, impairment of long-lived assets, income taxes and potential liability in conjunction with certain commitments and contingencies. Actual results could differ from those estimates.

Cash and Cash Equivalents

Cash includes cash on deposit, overnight repurchase agreements and amounts invested in highly liquid money market funds. Cash equivalents consist of short term investments with original maturities of three months or less. The Company maintains accounts with financial institutions and the balances in such accounts, at times, exceed Federally insured limits. This credit risk is divided among a number of financial institutions that management believes to be of high quality. The carrying amount of cash and cash equivalents approximates their fair value.

Restricted Cash

Restricted cash consists of cash held in an escrow account in association with construction draws for ESPCs, construction of project assets, cash collateralized letter of credit and operating and maintenance reserve accounts, as well as cash required under term loans to be maintained in debt service reserve accounts until all obligations have been indefeasibly paid in full.

Accounts Receivable

Accounts receivable are stated at the amount management expects to collect from outstanding balances. An allowance for doubtful accounts is provided for those accounts receivable considered to be uncollectible based upon historical experience and management’s evaluation of outstanding accounts receivable at the end of the period. Bad debts are written off against the allowance when identified.

Changes in the allowance for doubtful accounts are as follows:

Accounts Receivable Retainage

Accounts receivable retainage represents amounts due from customers, but where payments are withheld contractually until certain construction milestones are met. Amounts retained typically range from five percent to ten percent of the total invoice.

Inventory

Inventories, which consist primarily of PV solar panels, batteries and related accessories, are stated at the lower of cost (“first-in, first-out” method) or market (determined on the basis of estimated net realizable values). Provisions have been made to reduce the carrying value of inventory to the net realizable value.

Prepaid Expenses

Prepaid expenses consist primarily of short-term prepaid expenditures that will amortize within one year.

Federal ESPC Receivable

Federal ESPC receivable represents the amount to be paid by various Federal Government agencies for work performed and earned by the Company under specific ESPCs. The Company assigns certain of its rights to receive those payments to third-party lenders that provide construction and permanent financing for such contracts. The receivable is recognized as revenue as each project is constructed. Upon completion and acceptance of the project by the Government, typically within 24

months of construction commencement, the assigned ESPC receivable and corresponding related project debt is eliminated from the Company’s condensed consolidated financial statements.

Project Development Costs

The Company capitalizes as project development costs only those costs incurred in connection with the development of energy projects, primarily direct labor, interest costs, outside contractor services, consulting fees, legal fees and travel, if incurred after a point in time where the realization of related revenue becomes probable. Project development costs incurred prior to the probable realization of revenue are expensed as incurred. The Company classifies as a current asset those project development efforts that are expected to proceed to construction activity in the twelve months that follow. The Company periodically reviews these balances and writes off any amounts where the realization of the related revenue is no longer probable.

Property and Equipment

Property and equipment consists primarily of office and computer equipment, and is recorded at cost. Major additions and improvements are capitalized as additions to the property and equipment accounts, while replacements, maintenance and repairs that do not improve or extend the life of the respective assets, are expensed as incurred. Depreciation and amortization of property and equipment are computed on a straight-line basis over the following estimated useful lives:

Project Assets

Project assets consist of costs of materials, direct labor, interest costs, outside contract services and project development costs incurred in connection with the construction of small-scale renewable energy plants that the Company owns and the implementation of energy savings contracts. These amounts are capitalized and amortized over the lives of the related assets or the terms of the related contracts.

The Company capitalizes interest costs relating to construction financing during the period of construction. The interest capitalized is included in the total cost of the project at completion. There was no interest capitalized for the three months ended June 30, 2014 . There was $250 of interest capitalized for the three months ended June 30, 2013 . The amount of interest capitalized for the six months ended June 30, 2014 and 2013 was $395 and $715 , respectively.

Routine maintenance costs are expensed in the current year’s consolidated statements of income (loss) to the extent that they do not extend the life of the asset. Major maintenance, upgrades and overhauls are required for certain components of the Company’s assets. In these instances, the costs associated with these upgrades are capitalized and are depreciated over the shorter of the remaining life of the asset or the period until the next required major maintenance or overhaul. Gains or losses on disposal of property and equipment are reflected in selling, general and administrative expenses in the consolidated statements of income (loss).

The Company evaluates its long-lived assets for impairment as events or changes in circumstances indicate the carrying value of these assets may not be fully recoverable. The Company evaluates recoverability of long-lived assets to be held and used by estimating the undiscounted future cash flows before interest associated with the expected uses and eventual disposition of those assets. When these comparisons indicate that the carrying value of those assets is greater than the undiscounted cash flows, the Company recognizes an impairment loss for the amount that the carrying value exceeds the fair value.

From time to time, the Company applies for and receives cash grant awards from the U.S. Treasury Department (the “Treasury”) under Section 1603 of the American Recovery and Reinvestment Act of 2009 (the “Act”). The Act authorized the Treasury to make payments to eligible persons who place in service qualifying renewable energy projects. The grants are paid in lieu of investment tax credits. All of the cash proceeds from the grants were used and recorded as a reduction in the cost basis of the applicable project assets. If the Company disposes of the property, or the property ceases to qualify as specified

energy property, within five years from the date the property is placed in service, then a prorated portion of the Section 1603 payment must be repaid.

The Company received $3,727 in Section 1603 grants during the three and six months ended June 30, 2014 . The Company received $289 and $1,580 in Section 1603 grants during the three and six months ended June 30, 2013 , respectively.

For tax purposes, the Section 1603 payments are not included in Federal and certain state taxable income and the basis of the property is reduced by 50% of the payment received. Deferred grant income of $9,118 and $8,163 recorded in the accompanying consolidated balance sheets as of June 30, 2014 and December 31, 2013 , respectively, represents the benefit of the basis difference to be amortized to income tax expense over the life of the related property.

Deferred Financing Fees

Deferred financing fees relate to the external costs incurred to obtain financing for the Company. Deferred financing fees are amortized over the respective term of the financing using the effective interest method, with the exception of the Company’s revolving credit facility, as discussed in Note 9, for which deferred financing fees are amortized on a straight line basis over the term of the agreement.

Goodwill and Intangible Assets

The Company has classified as goodwill the amounts paid in excess of fair value of the net assets (including tax attributes) of companies acquired in purchase transactions. The Company has recorded intangible assets related to customer contracts, customer relationships, non-compete agreements, trade names and technology, each with defined useful lives. The Company assesses the impairment of goodwill and intangible assets that have indefinite lives on an annual basis (December 31 ^st ) and whenever events or changes in circumstances indicate that the carrying value of the asset may not be recoverable. The Company would record an impairment charge if such an assessment were to indicate that the fair value of such assets was less than their carrying values. Judgment is required in determining whether an event has occurred that may impair the value of goodwill or identifiable intangible assets.

Factors that could indicate that an impairment may exist include significant underperformance relative to plan or long-term projections, significant changes in business strategy, significant negative industry or economic trends or a significant decline in the base price of the Company’s publicly traded stock for a sustained period of time.   Although the Company believes goodwill and intangible assets are appropriately stated in the accompanying condensed consolidated financial statements, changes in strategy or market conditions could significantly impact these judgments and require an adjustment to the recorded balance.

Other Assets

Other assets consist primarily of notes and contracts receivable due to the Company from various customers and non-current restricted cash. Other assets also include the fair value of derivatives and the non-current portion of project development costs.

Asset Retirement Obligations

The Company recognizes a liability for the fair value of required asset retirement obligations (“AROs”) when such obligations are incurred. The liability is estimated on a number of assumptions requiring management’s judgment, including equipment removal costs, site restoration costs, salvage costs, cost inflation rates and discount rates and is credited to its projected future value over time. The capitalized asset is depreciated using the convention of depreciation of plant assets. Upon satisfaction of the ARO conditions, any difference between the recorded ARO liability and the actual retirement cost incurred is recognized as an operating gain or loss in the consolidated statements of income (loss). As of June 30, 2014 and December 31, 2013 , the Company had no AROs.

Federal ESPC Liabilities

Federal ESPC liabilities represent the advances received from third-party investors under agreements to finance certain energy savings performance contract projects with various Federal Government agencies. Upon completion and acceptance of the project by the Government, typically within 24 months of construction commencement, the ESPC receivable from the Government and corresponding related ESPC liability is eliminated from the Company’s consolidated balance sheet. Until recourse to the Company ceases for the ESPC receivables transferred to the investor, upon final acceptance of the work by the Government customer, the Company remains the primary obligor for financing received.

Other Liabilities

Other liabilities consist primarily of deferred revenue related to multi-year operation and maintenance contracts which expire as late as 2031. Other liabilities also include the fair value of interest rate swaps. See Note 7 for additional disclosures.

Revenue Recognition

The Company derives revenues from energy efficiency and renewable energy products and services. Energy efficiency products and services include the design, engineering, and installation of equipment and other measures to improve the efficiency, and control the operation, of a facility’s energy infrastructure. Renewable energy products and services include the construction of small-scale plants that produce electricity, gas, heat or cooling from renewable sources of energy, the sale of such electricity, gas, heat or cooling from plants that the Company owns, and the sale and installation of solar energy products and systems.

Revenue from the installation or construction of projects is recognized on a percentage-of-completion basis. The percentage-of-completion for each project is determined on an actual cost-to-estimated final cost basis. Maintenance revenue is recognized as related services are performed. In accordance with industry practice, the Company includes in current assets and liabilities the amounts of receivables related to construction projects realizable and payable over a period in excess of one year. The revenue associated with contract change orders is recognized only when the authorization for the change order has been properly executed and the work has been performed.

When the estimate on a contract indicates a loss, or claims against costs incurred reduce the likelihood of recoverability of such costs, the Company records the entire expected loss immediately, regardless of the percentage of completion.

Billings in excess of cost and estimated earnings represents advanced billings on certain construction contracts. Costs and estimated earnings in excess of billings represent certain amounts under customer contracts that were earned and billable but not invoiced.

The Company sells certain products and services in bundled arrangements, where multiple products and/or services are involved. The Company divides bundled arrangements into separate deliverables and revenue is allocated to each deliverable based on the relative selling price. The relative selling price is determined using third party evidence or management’s best estimate of selling price.

The Company recognizes revenue from the sale and delivery of products, including the output from renewable energy plants, when produced and delivered to the customer, in accordance with specific contract terms, provided that persuasive evidence of an arrangement exists, the Company’s price to the customer is fixed or determinable and collectability is reasonably assured.

  The Company recognizes revenue from operations and maintenance (“O&M”) contracts, consulting services and enterprise energy management services as the related services are performed.

  For a limited number of contracts under which the Company receives additional revenue based on a share of energy savings, such additional revenue is recognized as energy savings are generated.

Cost of Revenues

Cost of revenues include the cost of labor, materials, equipment, subcontracting and outside engineering that are required for the development and installation of projects, as well as preconstruction costs, sales incentives, associated travel, inventory obsolescence charges, amortization of intangible assets related to customer contracts and, if applicable, costs of procuring financing. A majority of the Company’s contracts have fixed price terms; however, in some cases the Company negotiates protections, such as a cost-plus structure, to mitigate the risk of rising prices for materials, services and equipment.

Cost of revenues also include the costs of maintaining and operating the small-scale renewable energy plants that the Company owns, including the cost of fuel (if any) and depreciation charges.

Income Taxes

The Company provides for income taxes based on the liability method. The Company provides for deferred income taxes based on the expected future tax consequences of differences between the financial statement basis and the tax basis of assets and liabilities calculated using the enacted tax rates in effect for the year in which the differences are expected to be reflected in the tax return.

The Company accounts for uncertain tax positions using a “more-likely-than-not” threshold for recognizing and resolving uncertain tax positions. The evaluation of uncertain tax positions is based on factors that include, but are not limited to, changes in tax law, the measurement of tax positions taken or expected to be taken in tax returns, the effective settlement of matters subject to audit, new audit activity and changes in facts or circumstances related to a tax position. The Company evaluates uncertain tax positions on a quarterly basis and adjusts the level of the liability to reflect any subsequent changes in the relevant facts surrounding the uncertain positions.

The Company’s liabilities for uncertain tax positions can be relieved only if the contingency becomes legally extinguished through either payment to the taxing authority or the expiration of the statute of limitations, the recognition of the benefits associated with the position meet the “more-likely-than-not” threshold or the liability becomes effectively settled through the examination process.

The Company considers matters to be effectively settled once the taxing authority has completed all of its required or expected examination procedures, including all appeals and administrative reviews; the Company has no plans to appeal or litigate any aspect of the tax position; and the Company believes that it is highly unlikely that the taxing authority would examine or re-examine the related tax position. The Company also accrues for potential interest and penalties, related to unrecognized tax benefits in income tax expense. See Note 4 for additional information on the Company’s income taxes.  

Foreign Currency

The local currency of the Company’s foreign operations is considered the functional currency of such operations. All assets and liabilities of the Company’s foreign operations are translated into U.S. dollars at period-end exchange rates. Income and expense items are translated at average exchange rates prevailing during the period. Translation adjustments are accumulated as a separate component of stockholders’ equity. Foreign currency translation gains and losses are reported in the consolidated statements of comprehensive income (loss). Foreign currency transaction gains and losses are reported in the consolidated statements of income (loss).

Financial Instruments

Financial instruments consist of cash and cash equivalents, restricted cash, accounts and notes receivable, long-term contract receivables, accounts payable, accrued expenses, equity-based liabilities, short- and long-term debt and interest rate swaps. The estimated fair value of cash and cash equivalents, restricted cash, accounts and notes receivable, long-term contract receivables, accounts payable, accrued expenses and equity-based liabilities approximates their carrying value. See below and Note 6 for additional information regarding the Company’s fair value measurements.

Fair Value Measurements

The Company follows the guidance related to fair value measurements for all of its non-financial assets and non-financial liabilities, except for those recognized at fair value in the financial statements at least annually. These assets include goodwill and long-lived assets measured at fair value for impairment assessments, and non-financial assets and liabilities initially measured at fair value in a business combination.

Because of their short maturity, the carrying amounts of cash and cash equivalents, accounts and notes receivable, accounts payable, accrued expenses and short-term debt approximate fair value. The carrying value of long-term variable-rate debt approximates fair value. As of June 30, 2014 , the fair value of the Company’s fixed-rate long-term debt exceeds its carrying value by approximately $103 . Fair value of the Company’s debt is based on quoted market prices or on rates available to the Company for debt with similar terms and maturities.

The Company accounts for its interest rate swaps as derivative financial instruments in accordance with the related guidance. Under this guidance, derivatives are carried on the Company’s consolidated balance sheets at fair value. The fair value of the Company’s interest rate swaps are determined based on observable market data in combination with expected cash flows for each instrument.

See Note 6 for additional information related to fair value measurements.

Stock-Based Compensation Expense

Stock-based compensation expense results from the issuance of shares of restricted common stock and grants of stock options to employees, directors, outside consultants and others. The Company recognizes the costs associated with restricted

stock and option grants using the fair value recognition provisions of ASC 718, Compensation - Stock Compensation on a straight-line basis over the vesting period of the awards.

Stock-based compensation expense is recognized based on the grant-date fair value. The Company estimates the fair value of the stock-based awards, including stock options, using the Black-Scholes option-pricing model. Determining the fair value of stock-based awards requires the use of highly subjective assumptions, including the fair value of the common stock underlying the award, the expected term of the award and expected stock price volatility.

The assumptions used in determining the fair value of stock-based awards represent management’s estimates, which involve inherent uncertainties and the application of management judgment. As a result, if factors change, and different assumptions are employed, the stock-based compensation could be materially different in the future. The risk-free interest rates are based on the U.S. Treasury yield curve in effect at the time of grant, with maturities approximating the expected life of the stock options.

The Company has no history of paying dividends. Additionally, as of each of the grant dates, there was no expectation that the Company would pay dividends over the expected life of the options. The expected life of the awards is estimated using historical data and management’s expectations. Because there was no public market for the Company’s common stock prior to the Company’s initial public offering, management lacked company-specific historical and implied volatility information. Therefore, estimates of expected stock volatility were based on that of publicly traded peer companies, and it is expected that the Company will continue to use this methodology until such time as there is adequate historical data regarding the volatility of the Company’s publicly traded stock price.

The Company is required to recognize compensation expense for only the portion of options that are expected to vest. Actual historical forfeiture rate of options is based on employee terminations and the number of shares forfeited. This data and other qualitative factors are considered by the Company in determining the forfeiture rate used in recognizing stock compensation expense. If the actual forfeiture rate varies from historical rates and estimates, additional adjustments to compensation expense may be required in future periods. If there are any modifications or cancellations of the underlying unvested securities or the terms of the stock option, it may be necessary to accelerate, increase or cancel any remaining unamortized stock-based compensation expense.

For the three months ended June 30, 2014 and 2013 , the Company recorded stock-based compensation expense of $707 and $665 , respectively, in connection with stock-based payment awards. For the six months ended June 30, 2014 and 2013 , the Company recorded stock-based compensation expense of $1,425 and $1,336 , respectively, in connection with stock-based payment awards. The compensation expense is allocated between cost of revenues and selling, general and administrative expenses in the accompanying consolidated statements of income (loss) based on the salaries and work assignments of the employees holding the options. As of June 30, 2014 , there was $4,867 of unrecognized compensation expense related to non-vested stock option awards that is expected to be recognized over a weighted-average period of 3.1 years .

The Company also accounts for equity instruments issued to non-employee directors and consultants at fair value. All transactions in which goods or services are the consideration received for the issuance of equity instruments are accounted for based on the fair value of the consideration received or the fair value of the equity instrument issued, whichever is more reliably measurable. The measurement date of the fair value of the equity instrument issued is the date on which the counterparty’s performance is complete. No awards to individuals who were not either an employee or director of the Company occurred during the six months ended June 30, 2014 or during the year ended December 31, 2013 .

Derivative Financial Instruments

In the normal course of business, the Company utilizes derivatives contracts as part of its risk management strategy to manage exposure to market fluctuations in interest rates. These instruments are subject to various credit and market risks. Controls and monitoring procedures for these instruments have been established and are routinely reevaluated. Credit risk represents the potential loss that may occur because a party to a transaction fails to perform according to the terms of the contract. The measure of credit exposure is the replacement cost of contracts with a positive fair value. The Company seeks to manage credit risk by entering into financial instrument transactions only through counterparties that the Company believes to be creditworthy.

Market risk represents the potential loss due to the decrease in the value of a financial instrument caused primarily by changes in interest rates. The Company seeks to manage market risk by establishing and monitoring limits on the types and

degree of risk that may be undertaken. As a matter of policy, the Company does not use derivatives for speculative purposes. The Company considers the use of derivatives with all financing transactions to mitigate risk.

The Company recognizes cash flows from derivative instruments as operating activities in the consolidated statements of cash flows. The effective portion of changes in fair value on interest rate swaps designated as cash flow hedges are recognized in the Company’s consolidated statements of comprehensive income (loss). The ineffective portion of changes in fair value on interest rate swaps designated as hedges and changes in fair value on interest rate swaps not designated as hedges are recognized in the Company’s consolidated statements of income (loss).

During 2007, the Company entered into two fifteen -year interest rate swap contracts under which the Company agreed to pay an amount equal to a specified fixed rate of interest times a notional principal amount, and to in turn receive an amount equal to a specified variable rate of interest times the same notional principal amount. The swaps cover initial notional amounts of $13,081 and $3,256 , each a variable rate note at fixed interest rates of 5.4% and 5.3% , respectively, and expire in March 2024 and February 2021, respectively. These interest rate swaps qualified, but were not designated, as cash flow hedges until April 1, 2010. Since April 2010, they have been designated as hedges.

In March 2010, the Company entered into a fourteen -year interest rate swap contract under which the Company agreed to pay an amount equal to a specified fixed rate of interest times a notional amount, and to in turn receive an amount equal to a specified variable rate of interest times the same notional principal amount. The swap covers an initial notional amount of approximately $27,900 variable rate note at a fixed interest rate of 6.99% and expires in December 2024. This swap was designated as a hedge in March 2013. During the second quarter of 2014 this swap was de-designated and re-designated as a hedge as a result of a partial pay down of the associated hedged debt principal. As a result $566 was reclassified from accumulated other comprehensive income and recorded as a reduction to other expense, net during the three months ended June 30, 2014 .

In July 2011, the Company entered into a five -year interest rate swap contract under which the Company agreed to pay an amount equal to a specified fixed rate of interest times a notional amount, and to in turn receive an amount equal to a specified variable rate of interest times the same notional principal amount. The swap covers an initial notional amount of $38,571 variable rate note at a fixed interest rate of 1.965% and expires in June 2016. This interest rate swap has been designated as a hedge since inception.

In October 2012, the Company entered into two eight -year interest rate swap contracts under which the Company agreed to pay an amount equal to a specified fixed rate of interest times a notional amount, and to in turn receive an amount equal to a specified variable rate of interest times the same notional principal amount. The swaps cover an initial notional amount of $16,750 variable rate note at a fixed interest rate of 1.71% . This notional amount increased to $42,247 on September 30, 2013 and expires in March 2020. This interest rate swap has been designated as a hedge since inception.

In October 2012, the Company also entered into two eight -year forward starting interest rate swap contracts under which the Company agreed to pay an amount equal to a specified fixed rate of interest times a notional amount, and to in turn receive an amount equal to a specified variable rate of interest times the same notional principal amount. The swaps cover an initial notional amount of $25,377 variable rate note at a fixed interest rate of 3.70% , with an effective date of March 31, 2020, and expires in June 2028. This interest rate swap has been designated as a hedge since inception.

See Notes 6 and 7 for additional information on the Company’s derivative instruments.

AMERESCO, INC.
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - (Continued)

(in thousands, except share and per share amounts)

Earnings Per Share

Basic earnings per share is calculated using the Company’s weighted-average outstanding common shares, including vested restricted shares. When the effects are not anti-dilutive, diluted earnings per share is calculated using: the weighted-average outstanding common shares; the dilutive effect of convertible preferred stock, under the “if converted” method; and the treasury stock method with regard to warrants and stock options; all as determined under the treasury stock method.

The Company excluded 716,695 and 987,663 potentially dilutive shares from the calculation of diluted earnings per share for the six months ended June 30, 2014 and 2013 , respectively, as the effect would be anti-dilutive due to the Company’s net loss position in both periods.

For the three months ended June 30, 2014 and 2013 , the total number of shares of common stock related to stock options excluded from the calculation of dilutive shares, as the effect would be anti-dilutive, was 1,811,928 and 2,475,556 , respectively. For the six months ended June 30, 2014 and 2013 , the total number of shares of common stock related to stock options excluded from the calculation of dilutive shares, as the effect would be anti-dilutive, was 1,781,928 and 2,532,853 , respectively.

Variable Interest Entities

Certain contracts are executed jointly through partnership and joint venture arrangements with unrelated third parties. Generally, these arrangements are characterized by a 50 percent or less ownership interest that requires only a small initial investment. The arrangements are often formed for the single business purpose of executing a specific project and allow the Company to share risks and/or secure specialty skills required for project execution.

        The Company evaluates each partnership and joint venture at inception to determine if it qualifies as a variable interest entity (“VIE”) under ASC 810, Consolidation . A variable interest entity is an entity used for business purposes that either (a) does not have equity investors with voting rights or (b) has equity investors who are not required to provide sufficient financial resources for the entity to support its activities without additional subordinated financial support. Upon the occurrence of certain events outlined in ASC 810, the Company reassesses its initial determination of whether the partnership or joint venture is a VIE.

        The Company also evaluates whether it is the primary beneficiary of each VIE and consolidates the VIE if the Company has both (a) the power to direct the economically significant activities of the entity and (b) the obligation to absorb losses of, or the right to receive benefits from, the entity that could potentially be significant to the VIE. The Company considers the contractual agreements that define the ownership structure, distribution of profits and losses, risks, responsibilities, indebtedness, voting rights and board representation of the respective parties in determining whether it qualifies as the primary beneficiary. The Company also considers all parties that have direct or implicit variable interests when determining whether it is the primary beneficiary. When the Company is determined to be the primary beneficiary, the VIE is consolidated. As required by ASC 810, management's assessment of whether the Company is the primary beneficiary of a VIE is continuously performed.

Recent Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers (Topic 606). The guidance in this ASU affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are within the scope of other standards. The guidance in this ASU supersedes the revenue recognition requirements in ASC 605, Revenue Recognition , and most industry-specific guidance throughout the Industry Topics of the Codification. Additionally, this ASU supersedes some cost guidance included in ASC 605-35, Revenue Recognition-Construction-Type and Production-Type Contracts . In addition, the existing requirements for the recognition of a gain or loss

on the transfer of nonfinancial assets that are not in a contract with a customer are amended to be consistent with the guidance on recognition and measurement in this ASU. For a public entity, the amendments in this ASU are effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. Retrospective application of the amendments in this ASU are required. The new guidance must be adopted using either a full retrospective approach for all periods presented in the period of adoption (with some limited relief provided) or a modified retrospective approach. Early application is not permitted under GAAP. The Company is currently assessing the impact of this ASU on its consolidated financial statements.

3. GOODWILL AND INTANGIBLE ASSETS

The changes in the carrying value of goodwill attributable to each reportable segment are as follows:

(1) Fair value adjustment represents a final purchase accounting adjustment to decrease the recorded fair value of certain acquired intangible assets totaling $801 , net of a $160 deferred tax liability adjustment, related to the Company’s prior year acquisition of The Energy Services Partnership Limited and ESP Response Limited (together “ESP”).

Separable intangible assets that are not deemed to have indefinite lives are amortized over their useful lives. The Company annually assesses whether a change in the life over which the Company’s assets are amortized is necessary, or more frequently if events or circumstances warrant. No changes to useful lives were made during the six months ended June 30, 2014 or for the year ended December 31, 2013 .

Acquired intangible assets other than goodwill that are subject to amortization include customer contracts, customer relationships, non-compete agreements, technology and trade names. Customer contracts are amortized ratably over the period of the acquired customer contracts ranging in periods from approximately one to five years. All other acquired intangible assets are amortized over periods ranging from approximately four to fifteen years, as defined by the nature of the respective intangible asset. Intangible assets acquired during the six months ended June 30, 2014 consisted of customer contracts, customer relationships, non-compete assets and technology which were assigned a weighted average useful life of 10.6 years.

AMERESCO, INC.
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) - (Continued)

(in thousands, except share and per share amounts)

The gross carrying amount and accumulated amortization of intangible assets are as follows:

Amortization expense related to customer contracts is included in cost of revenues in the consolidated statements of income (loss). Amortization expense related to all other acquired intangible assets is included in selling, general and administrative expenses in the consolidated statements of income (loss). Amortization expense for the three months ended June 30, 2014 and 2013 related to customer contracts was $363 and $227 , respectively. Amortization expense for the six months ended June 30, 2014 and 2013 related to customer contracts was $614 and $454 , respectively. Amortization expense for the three months ended June 30, 2014 and 2013 related to all other acquired intangible assets was $697 and $671 , respectively. Amortization expense for the six months ended June 30, 2014 and 2013 related to all other acquired intangible assets was $1,264 and $1,335 , respectively.

4. INCOME TAXES

The provision (benefit) for income taxes was $267 and $(577) , for the three months ended June 30, 2014 and 2013 , respectively. The provision (benefit) for income taxes was $31 and $(1,200) , for the six months ended June 30, 2014 and 2013 , respectively. The estimated 2014 effective tax rate changed to 8.9% for the three months ended June 30, 2014 from a 24.5% estimated annual effective tax rate for the three months ended June 30, 2013 . For the six months ended June 30, 2014 the estimated 2014 effective tax rate was 0.2% , before discrete items, com pared to a 24.5% estimated annual effective tax rate for the six months ended June 30, 2013 .

At June 30, 2014 and December 31, 2013 , the Company had approximately $9,200 of total gross unrecognized tax benefits. Of the total gross unrecognized tax benefits as of June 30, 2014 and December 31, 2013 , approximately $5,500 (net of the Federal benefit on state amounts) represents the amount of unrecognized tax benefits that, if recognized, would favorably affect the effective income tax rate in any future periods.

5. COMMITMENTS AND CONTINGENCIES

Legal Proceedings

The Company is involved in a variety of claims and other legal proceedings generally incidental to its normal business activities. While the outcome of any of these proceedings cannot be accurately predicted, the Company does not believe the ultimate resolution of any of these existing matters would have a material adverse effect on its financial condition or results of operations.

Solar Tariff Contingency

In October 2012, the U.S. Department of Commerce (“Commerce”) announced its final determination in the anti-dumping and countervailing duty investigations of imports of solar cells manufactured in the People’s Republic of China (“PRC”),

including solar modules containing such cells. Commerce’s final determination confirmed its previously published anti-dumping duty of 249.96% , in the case of the Company, and increased its countervailing duty from 3.61% to 15.24% ; both duties are applied to the value of imports of solar modules containing PRC cells. Under Commerce’s determination, the anti-dumping and countervailing duties both were to apply retroactively 90 days from the date each preliminary decision was published to February 25, 2012 and December 21, 2011, respectively. On November 7, 2012, the International Trade Commission announced its final determination upholding the duties, but eliminating the retroactive periods. Since early 2012, the Company has been importing solar modules containing PRC cells, though it ceased doing so in July 2012 in response to these duties. The Company is monitoring and evaluating its alternatives for obtaining a separate and reduced anti-dumping duty rate. Depending on whether the maximum anti-dumping duty rate of 249.96% or some lower rate applies, the Company may be liable for combined duties of up to approximately $3,300 .

The Company has established a reserve reflecting its current estimate of its ultimate exposure to these assessments.

6. FAIR VALUE MEASUREMENT

The Company recognizes its financial assets and liabilities at fair value on a recurring basis (at least annually). Fair value is defined as the price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Three levels of inputs that may be used to measure fair value are as follows:

Level 1:   Inputs are based upon unadjusted quoted prices for identical instruments traded in active markets.

Level 2:   Inputs are based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3:   Inputs are generally unobservable and typically reflect management’s estimates of assumptions that market participants would use in pricing the asset or liability. The fair values are therefore determined using model-based techniques that include option pricing models, discounted cash flow models, and similar techniques.

The following table presents the input level used to determine the fair values of the Company’s financial instruments measured at fair value on a recurring basis:

The fair value of the Company’s interest rate swaps was determined using a cash flow analysis on the expected cash flow of the contract in combination with observable market-based inputs, including interest rate curves and implied volatilities. As part of this valuation, the Company considered the credit ratings of the counterparties to the interest rate swaps to determine if a credit risk adjustment was required.

The fair value of financial instruments is determined by reference to observable market data and other valuation techniques as appropriate. The only category of financial instruments where the difference between fair value and recorded book value is notable is long-term debt. At June 30, 2014 , the fair value of the Company’s long-term debt was estimated using discounted cash flows analysis, based on quoted market prices or on rates available to the Company for debt with similar terms and maturities, which are considered to be level two inputs. There were no transfers in or out of level two for the three month period ended June 30, 2014 . Based on the analysis performed, the fair value and the carrying value of the Company’s long-term debt are as follows:

The Company is also required periodically to measure certain other assets at fair value on a nonrecurring basis, including long-lived assets, goodwill and other intangible assets. The Company determined the fair value used in its annual impairment analysis with its own discounted cash flow analysis. The Company has determined the inputs used in such analysis as Level 3 inputs. The Company did not record any impairment charges on goodwill or other intangible assets as no significant events requiring non-financial assets and liabilities to be measured at fair value occurred for the six months ended June 30, 2014 .

7. DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES

Information about the fair value amounts of the Company’s derivative instruments is as follows: