Exhibit 99.1

FOR IMMEDIATE RELEASE

Contact:		Media Relations:		CarolAnn Hibbard, (508) 661-2264, news@ameresco.com
		Investor Relations:		Andrew Spence, (508) 661-2212, ir@ameresco.com

Ameresco Reports Third Quarter 2010 Financial Results

Third Quarter 2010 Financial Highlights:

	•		Third quarter revenues increased 45% year-over-year to $191.9 million
	•		Third quarter net income increased 47% year-over-year to $12.0 million
	•		Net income per diluted share was $0.28 in the third quarter of 2010 compared to $0.23 per diluted share in the third quarter of 2009

Nine Month Year-to-Date 2010 Performance:

	•		Nine month revenues increased 49% year-over-year to $438.9 million
	•		Nine month net income increased 103% year-over-year to $21.0 million
	•		Net income per diluted share was $0.53 for the first nine months of 2010, a 79% increase over the $0.30 per diluted share earned during the same period in 2009

FRAMINGHAM, MA — October 29, 2010 — Ameresco, Inc. (NYSE:AMRC) a leading energy efficiency and renewable energy company, today announced financial results for the quarter ended September 30, 2010. Ameresco had revenues of $191.9 million in the third quarter of 2010, compared to $132.3 million in the third quarter of 2009, an increase of 45%. Net income for the third quarter of 2010 was $12.0 million, compared to $8.2 million in the third quarter of 2009, an increase of 47%. Net income per diluted share was $0.28 in the third quarter of 2010, compared to $0.23 per diluted share in the same quarter of 2009. The third quarter 2009 results included non-recurring gains from derivative activity totaling $2.8 million. Excluding the effect of these items, the increase in net income from 2009 would have been 95%.

“Ameresco produced strong third quarter financial performance by effectively executing on our existing projects and continuing to successfully implement our 2010 business plan,” said George Sakellaris, president and chief executive officer of Ameresco. “We made significant progress on many of our marquee projects. We continue to win business across North America, and this quarter won a bid with the U.S. Navy to improve energy efficiency for two of their facilities in Italy. We are pleased that demand for our solutions remains strong and that organizations are realizing the

need for implementing energy efficiency and renewable energy solutions that produce financial as well as social returns.”

Ameresco’s third quarter results were driven by strong market demand for energy solutions, increased revenues, improved gross profit margins, particularly from renewable energy projects, and increased operating leverage.

For the nine months ended September 30, 2010, Ameresco reported total revenues of $438.9 million, compared to $295.1 million for the same period in 2009, an increase of 49%. Net income for the first nine months of 2010 was $21.0 million, or $0.53 per diluted share, compared with $10.3 million, or $0.30 per diluted share for the first nine months of 2009. Net income for the period increased 103% excluding the effects of the derivative activity noted above, would have been 153%.

Operating Highlights

	•		EBITDA for the third quarter of 2010 increased by 67% over the third quarter of 2009 to $24.4 million
	•		EBITDA for the first nine months of 2010 increased 112% over the first nine months of 2009 to $44.1 million
	•		Operating cash flows were $9.1 million for the third quarter of 2010
	•		Total backlog of contracted, and awarded but not yet contracted, projects remains strong at $1.12 billion

Some Key Highlights for Q3 2010

	•		Acquisition of Quantum Energy, Renton WA. On August 31, Ameresco acquired Quantum Engineering and Development, an ESCO that provides energy and water auditing, engineering, construction and commissioning services to public, commercial and industrial clients in the western U.S. Since 1999, Quantum has delivered over $63 million in projects to public and private clients.
	•		Over 97 contracts were executed for the quarter with good representation across all our regions. Some marquee initiatives include:

	•		U.S. Navy at their facilities in Naples and Sigonella, Italy. Ameresco was awarded a $13.5 million ESPC for two US Navy locations. The ESPC is a mix of measures that includes energy efficient lighting, chillers, and controls.
	•		The Department of Veterans Affairs, Veterans Administration Medical Center (VAMC). Ameresco was awarded a $6.6 million contract to design and build a solar photovoltaic system for the VAMC in Salt Lake City, Utah. The roof top systems, ranging from 35 to 100 kW, will be installed on seven campus facilities, and the ground-mounted system is expected to generate approximately 550 kW once completed.

	•		The U.S. Bureau of Land Management (BLM). BLM enlisted the AMERESCO AXIS® invoice and data management product to establish a Bureau-wide energy management information system to help reduce its energy costs, consumption, and carbon footprint in facilities throughout the western U.S. This is the first Federal contract for AXIS, affording an opportunity to demonstrate its capabilities and value for this market that has some of the largest users of electricity in the country.
	•		The Massachusetts State Department of Energy Resources (DOER). The MA DOER and Ameresco worked to sign agreements to design, construct, finance, own, and operate solar power systems on five state facilities—two Massport Logan Airport terminals, Bridgewater State College, Worcester State College and the Canton Housing Authority. Under 20-year Power Purchase Agreements (PPAs), the state facilities will receive solar-generated electricity at a discount to their current electricity bills, thereby cutting their energy budgets. These agreements are under the first of multiple phases of PPA projects, positioning Ameresco within communities for when they embrace and move towards PPAs.

Outlook

Ameresco expects that for the year ending December 31, 2010, it will earn total revenues in the range of $585 million to $595 million, EBITDA will be in the range of $55 million to $57 million, and net income will be in the range of $27 million to $28 million. The company also expects that net income per diluted share for 2010 will be in the range of $0.65 to $0.68.

Webcast Reminder

Ameresco will hold its earnings conference call today, October 29, at 10:30 a.m. Eastern Time with President and CEO, George Sakellaris, and Vice President and Chief Financial Officer, Andrew Spence, to discuss details regarding the company’s third quarter 2010 results, business outlook and strategy. Participants may access it by dialing domestically (888) 713-4209 or internationally (617) 213-4863. The passcode is 86670561. Those who wish to listen only to the conference call webcast may visit the “Investor Relations” section of the Company’s website at www.ameresco.com. Participants are advised to dial-in at least ten minutes prior to the call to register.

Pre-Registration for the call is available at:
https://cossprereg.btci.com/prereg/key.process?key=PGL4K9YVW

Pre-registrants will be issued a pin number to use when dialing into the live call which will provide quick access to the conference by bypassing the operator upon connection.

The webcast will be available on the Company’s website shortly after the call.

Use of Non-GAAP Financial Measures

This press release and the accompanying tables reflect EBITDA, which is a non-GAAP financial measure. For a description of this non-GAAP financial measure, including the reasons management

uses this measure and a reconciliation of EBITDA to operating income, the most directly comparable financial measure prepared in accordance with GAAP; please see the section of the accompanying tables titled “Non-GAAP Financial Measures” in Exhibit A.

About Ameresco, Inc.

Ameresco, Inc. was incorporated in Delaware in April 2000 and is a leading independent provider of comprehensive energy efficiency and renewable energy solutions for facilities throughout North America. Ameresco’s solutions include upgrades to a facility’s energy infrastructure, and the development, construction, and operation of renewable energy plants. With corporate headquarters located in Framingham, MA, Ameresco has 55 offices in 29 states and four Canadian provinces. For more information, visit www.ameresco.com.

Safe Harbor Statement

Any statements in this press release about future expectations, plans and prospects for Ameresco, Inc., including statements about backlog, estimated future revenues and projects, as well as other statements containing the words “believes,” “anticipates,” “plans,” “expects,” “will” and similar expressions, constitute forward-looking statements within the meaning of The Private Securities Litigation Reform Act of 1995. Actual results may differ materially from those indicated by such forward-looking statements as a result of various important factors, including demand for our energy efficiency and renewable energy solutions; our ability to arrange financing our projects; changes in federal, state and local government policies and programs related to energy efficiency and renewable energy; the timing of work we do on projects where we recognize revenue on a percentage of completion basis; seasonality in construction and in demand for our products and services; a customer’s decision to delay our work on, or other risks involved with, a particular project; availability and costs of labor and equipment the addition of new customers or the loss of existing customers; and other factors discussed in Ameresco’s Quarterly Report on Form 10-Q, filed with the U.S. Securities and Exchange Commission on September 7, 2010. In addition, the forward-looking statements included in this press release represent Ameresco’s views as of the date of this press release. Ameresco anticipates that subsequent events and developments will cause its views to change. However, while Ameresco may elect to update these forward-looking statements at some point in the future, it specifically disclaims any obligation to do so. These forward-looking statements should not be relied upon as representing Ameresco’s views as of any date subsequent to the date of this press release.

AMERESCO, INC.
CONSOLIDATED BALANCE SHEETS
AS OF DECEMBER 31, 2009 AND SEPTEMBER 30, 2010

		2009				2010
						(Unaudited)
ASSETS
Current assets:
Cash and cash equivalents		$	47,927,540			$	29,266,001
Restricted cash			9,249,885				10,617,362
Accounts receivable, net			61,279,515				91,905,734
Accounts receivable retainage			9,242,288				17,337,445
Costs and estimated earnings in excess of billings			14,009,076				32,724,457
Inventory, net			4,237,909				5,309,177
Prepaid expenses and other current assets			8,077,761				13,649,918
Deferred income taxes			9,279,473				10,819,900
Project development costs			8,468,974				9,266,798
Total current assets			171,772,421				220,896,792
Federal ESPC receivable financing			51,397,347				161,920,078
Property and equipment, net			4,373,256				4,661,471
Project assets, net			117,637,990				134,995,537
Deferred financing fees, net			3,582,560				3,431,442
Goodwill			16,132,429				18,460,564
Other assets			10,648,605				4,144,324
			203,772,187				327,613,416
		$	375,544,608			$	548,510,208
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Current portion of long-term debt		$	8,093,016			$	4,932,771
Accounts payable			75,578,378				94,671,536
Accrued liabilities			18,362,674				13,361,057
Billings in excess of cost and estimated earnings			28,166,364				30,870,614
Income taxes payable			2,129,529				2,808,209
Total current liabilities			132,329,961				146,644,187
Long-term debt:
Long-term debt, less current portion			102,807,203				180,663,431
Subordinated debt			2,998,750				—
Deferred income taxes			11,901,645				11,901,645
Deferred grant income			4,158,508				3,995,058
Other liabilities			18,578,754				23,042,218
			140,444,860				219,602,352
Stockholders’ equity:
Series A convertible preferred stock, $0.0001 par value, 3,500,000 shares authorized,
3,210,000 shares issued and outstanding at 12/31/2009, no shares issued and outstanding at 9/30/2010			321				—
Preferred stock, $0.0001 par value, 5,000,000 shares authorized, no shares issued and
outstanding at 12/31/2009 and 9/30/2010			—				—
Common stock, $0.0001 par value, 60,000,000 shares authorized, 17,998,168 shares
issued and 13,282,284 outstanding at 12/31/2009, no shares issued and outstanding at 9/30/2010			1,800				—
Class A common stock, $0.0001 par value, 500,000,000 shares authorized, no shares
issued and outstanding at 12/31/2009, 27,919,449 shares issued and 23,086,165 shares outstanding at 9/30/2010			—				2,792
Class B common stock, $0.0001 par value, 144,000,000 shares authorized, no shares
issued and outstanding at 12/31/2009, 18,000,000 shares issued and outstanding at 9/30/2010			—				1,800
Additional paid-in capital			10,466,312				71,308,330
Retained earnings			97,882,985				118,909,218
Accumulated other comprehensive income			2,831,970				1,224,100
Less — treasury stock, at cost, 4,715,884 shares and 4,833,284 shares, respectively			(8,413,601	)			(9,182,571	)
Total stockholders’ equity			102,769,787				182,263,669
		$	375,544,608			$	548,510,208

AMERESCO, INC.
CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME
FOR THE THREE MONTHS ENDED SEPTEMBER 30, 2009 AND 2010

		Three Months Ended September 30,
		2009				2010
		(Unaudited)
Revenue:
Energy efficiency revenue		$	106,803,997			$	147,863,350
Renewable energy revenue			25,490,418				44,038,079
			132,294,415				191,901,429
Direct expenses:
Energy efficiency expenses			88,714,827				121,906,348
Renewable energy expenses			19,662,420				35,114,345
			108,377,247				157,020,693
Gross profit			23,917,168				34,880,736
Operating expenses:
Salaries and benefits			7,364,786				8,409,014
Project development costs			1,267,986				2,716,616
General, administrative and other			3,708,122				4,841,508
			12,340,894				15,967,138
Operating income			11,576,274				18,913,598
Other income (expenses), net			924,031				(2,010,030	)
Income before provision for income taxes			12,500,305				16,903,568
Income tax provision			4,305,830				4,862,651
Net income			8,194,475				12,040,917
Other comprehensive income (loss):
Unrealized loss from interest rate hedge, net of tax			—				(746,087	)
Foreign currency translation adjustment			3,530,723				879,842
Comprehensive income (loss)		$	11,725,198			$	12,174,672
Net income per share attributable to common shareholders:
Basic		$	0.86			$	0.35
Diluted		$	0.23			$	0.28
Weighted average common shares outstanding:
Basic			9,559,545				34,434,352
Diluted			35,625,835				43,445,391
OTHER NON-GAAP DISCLOSURES
Gross margins:
Energy efficiency revenue			16.9	%			17.6	%
Renewable energy revenue			22.9	%			20.3	%
Total			18.1	%			18.2	%
Operating expenses as a percent of revenue			9.3	%			8.3	%
Earnings before interest, taxes, depreciation and amortization (EBITDA):
Operating income		$	11,576,274			$	18,913,598
Depreciation and impairment			2,376,444				4,796,021
Stock-based compensation			611,414				651,352
EBITDA		$	14,564,132			$	24,360,970
EBITDA margin			11.0	%			12.7	%
Construction backlog:
Awarded		$	733,646,495			$	530,572,308
Fully-contracted			379,997,559				592,745,083
Total construction backlog		$	1,113,644,054			$	1,123,317,391

     Note: Awarded represents estimated future revenues from projects that have been awarded, though the contracts have not yet been signed.

AMERESCO, INC.
CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME
FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2009 AND 2010

		Nine Months Ended September 30,
		2009				2010
		(Unaudited)
Revenue:
Energy efficiency revenue		$	241,290,308			$	323,578,578
Renewable energy revenue			53,848,666				115,305,944
			295,138,974				438,884,522
Direct expenses:
Energy efficiency expenses			199,585,426				267,495,450
Renewable energy expenses			42,597,466				91,955,471
			242,182,892				359,450,921
Gross profit			52,956,082				79,433,601
Operating expenses:
Salaries and benefits			18,817,921				21,893,756
Project development costs			6,862,982				7,893,558
General, administrative and other			13,261,611				16,156,553
			38,942,514				45,943,867
Operating income			14,013,568				33,489,734
Other income (expenses), net			1,512,388				(4,082,417	)
Income before provision for income taxes			15,525,956				29,407,317
Income tax provision			5,193,123				8,381,084
Net income			10,332,833				21,026,233
Other comprehensive income (loss):
Unrealized loss from interest rate hedge, net of tax			—				(2,297,667	)
Foreign currency translation adjustment			3,269,613				689,797
Comprehensive income		$	13,602,446			$	19,418,363
Net income per share attributable to common shareholders:
Basic		$	1.08			$	1.02
Diluted		$	0.30			$	0.53
Weighted average common shares outstanding:
Basic			9,576,548				20,563,849
Diluted			34,812,967				39,513,507
OTHER NON-GAAP DISCLOSURES
Gross Margins:
Energy efficiency revenue			17.3	%			17.3	%
Renewable energy revenue			20.9	%			20.3	%
Total			17.9	%			18.1	%
Operating expenses as a percent of revenue			13.2	%			10.5	%
Earnings before interest, taxes, depreciation and amortization (EBITDA):
Operating income		$	14,013,568			$	33,489,734
Depreciation and impairment			4,962,352				8,858,264
Stock-based compensation			1,844,400				1,758,503
EBITDA		$	20,820,320			$	44,106,501
EBITDA margin			7.1	%			10.0	%

AMERESCO, INC.
CONSOLIDATED STATEMENTS OF CASH FLOWS
FOR THE THREE MONTHS ENDED SEPTEMBER 30, 2009 AND 2010

		Three Months Ended September 30,
		2009				2010
		(Unaudited)
Cash flows from operating activities:
Net income		$	8,194,525			$	12,040,917
Adjustment to reconcile net income to cash provided by investing activities:
Depreciation of project assets			1,876,182				4,206,992
Depreciation of property and equipment			500,262				589,029
Amortization of deferred financing fees			59,016				306,398
Write-down of long-term receivable			—				—
Unrealized gain on interest rate swaps			(354,326	)			—
Stock-based compensation expense			611,414				651,352
Deferred income taxes			(314,885	)			792,193
Changes in operating assets and liabilities:
(Increase) decrease in:
Restricted cash draws			13,677,494				53,185,373
Accounts receivable			(12,650,473	)			(21,103,490	)
Accounts receivable retainage			(2,875,973	)			(5,204,217	)
Federal ESPC receivable financing			(18,759,514	)			(51,833,048	)
Inventory			1,371,016				23,790
Costs and estimated earnings in excess of billings			2,411,481				(8,859,603	)
Prepaid expenses and other current assets			(845,316	)			(1,817,278	)
Project development costs			(1,256,091	)			(872,942	)
Other assets			88,416				4,560,707
Increase (decrease) in:
Accounts payable and accrued expenses			14,543,943				25,940,748
Billings in excess of cost and estimated earnings			10,110,040				(1,341,379	)
Other liabilities			4,044,968				337,826
Income taxes payable			2,668,299				(2,541,814	)
Net cash provided by operating activities			23,100,478				9,061,554
Cash flows from investing activities:
Purchases of property and equipment			(508,466	)			(877,781	)
Purchases of project assets			2,341,325				(12,415,691	)
Acquisitions, net of cash received			(674,110	)			(6,138,941	)
Net cash provided by (used in) investing activities			1,158,749				(19,432,413	)
Cash flows from financing activities:
Payments of financing fees			(9,842	)			(402,625	)
Proceeds from options and warrant exercises and issuance of stock			—				59,649,893
Repurchase of stock			—				—
Proceeds from (payments on) senior secured credit facility			(15,062,033	)			(31,351,119	)
Proceeds from long-term debt financing			1,352,559				—
Restricted cash			(3,771,371	)			(1,137,175	)
Repayment of subordinated debt			—				(2,998,750	)
Payments on long-term debt			(1,178,396	)			(5,755,902	)
Net cash (used in) provided by financing activities			(18,669,083	)			18,004,322
Effect of exchange rate changes on cash			1,021,999				498,142
Net increase in cash and cash equivalents			6,612,143				8,131,605
Cash and cash equivalents, beginning of period			8,855,402				21,134,396
Cash and cash equivalents, end of period		$	15,467,545			$	29,266,001

AMERESCO, INC.
CONSOLIDATED STATEMENTS OF CASH FLOWS
FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2009 AND 2010

		Nine Months Ended September 30,
		2009				2010
		(Unaudited)
Cash flows from operating activities:
Net income		$	10,332,833			$	21,026,233
Adjustment to reconcile net income to cash provided by investing activities:
Depreciation of project assets			3,928,979				7,623,850
Depreciation of property and equipment			1,033,373				1,234,415
Amortization of deferred financing fees			161,662				474,403
Provision for bad debts			327,558				—
Write-down of long-term receivable			—				2,111,000
Unrealized gain (loss) on interest rate swaps			1,634,619				(133,591	)
Stock-based compensation expense			1,844,400				1,758,503
Deferred income taxes			418,256				—
Changes in operating assets and liabilities:
(Increase) decrease in:
Restricted cash draws			21,612,096				108,936,357
Accounts receivable			(21,059,142	)			(24,037,153	)
Accounts receivable retainage			(1,353,728	)			(7,491,725	)
Federal ESPC receivable financing			(27,056,209	)			(110,522,731	)
Inventory			1,679,369				(1,071,268	)
Costs and estimated earnings in excess of billings			(9,709,704	)			(16,660,465	)
Prepaid expenses and other current assets			(2,463,756	)			(5,518,403	)
Project development costs			(2,899,742	)			(790,904	)
Other assets			6,207,159				6,582,019
Increase (decrease) in:
Accounts payable and accrued expenses			4,423,091				6,749,903
Billings in excess of cost and estimated earnings			12,101,951				2,311,175
Other liabilities			(5,315,700	)			1,969,263
Income taxes payable			1,060,602				(946,361	)
Net cash used in operating activities			(3,092,033	)			(6,395,480	)
Cash flows from investing activities:
Purchases of property and equipment			(1,430,604	)			(1,361,876	)
Purchases of project assets			(14,587,244	)			(24,783,062	)
Acquisitions, net of cash received			(674,110	)			(6,138,941	)
Net cash used in investing activities			(16,691,958	)			(32,283,879	)
Cash flows from financing activities:
Payments of financing fees			(79,905	)			(1,300,058	)
Proceeds from options and warrant exercises and issuance of stock			—				60,062,759
Repurchase of stock			(874,948	)			(768,970	)
Proceeds from (payments on) senior secured credit facility			(4,449,242	)			(19,915,218	)
Proceeds from long-term debt financing			28,074,858				812,398
Restricted cash			(5,054,245	)			(5,956,433	)
Repayment of subordinated debt			—				(2,998,750	)
Payments on long-term debt			(2,626,925	)			(10,548,598	)
Net cash provided by financing activities			14,989,593				19,387,130
Effect of exchange rate changes on cash			2,112,798				630,690
Net decrease in cash and cash equivalents			(2,681,600	)			(18,661,539	)
Cash and cash equivalents, beginning of year			18,149,145				47,927,540
Cash and cash equivalents, end of period		$	15,467,545			$	29,266,001

Exhibit A: Non-GAAP Financial Measures

Ameresco defines EBITDA as operating income before depreciation and impairment expense and share-based compensation expense. EBITDA is a non-GAAP financial measure and should not be considered as an alternative to operating income or any other measure of financial performance calculated and presented in accordance with GAAP.

The Company believes EBITDA is useful to investors in evaluating its operating performance for the following reasons: EBITDA and similar non-GAAP measures are widely used by investors to measure a company’s operating performance without regard to items that can vary substantially from company to company depending upon financing and accounting methods, book values of assets, capital structures and the methods by which assets were acquired; securities analysts often use EBITDA and similar non-GAAP measures as supplemental measures to evaluate the overall operating performance of companies; and by comparing our EBITDA in different historical periods, our investors can evaluate our operating results without the additional variations of depreciation and amortization expense, and share-based compensation expense.

Ameresco’s management uses EBITDA: as a measure of operating performance, because it does not include the impact of items that management does not consider indicative of our core operating performance; for planning purposes, including the preparation of the annual operating budget; to allocate resources to enhance the financial performance of the business; to evaluate the effectiveness of Ameresco’s business strategies; and in communications with the board of directors and investors concerning Ameresco’s financial performance.

The Company understands that, although measures similar to EBITDA are frequently used by investors and securities analysts in their evaluation of companies, EBITDA has limitations as an analytical tool, and you should not consider it in isolation or as a substitute for GAAP operating income or an analysis of Ameresco’s results of operations as reported under GAAP. Some of these limitations are: EBITDA does not reflect the Company’s cash expenditures or future requirements for capital expenditures or other contractual commitments; EBITDA does not reflect changes in, or cash requirements for, Ameresco’s working capital needs; EBITDA does not reflect stock-based compensation expense; EBITDA does not reflect cash requirements for income taxes; EBITDA does not reflect net interest income (expense); although depreciation, amortization and impairment are non-cash charges, the assets being depreciated, amortized or impaired will often have to be replaced in the future, and EBITDA does not reflect any cash requirements for these replacements; and other companies in Ameresco’s industry may calculate EBITDA differently than we do, limiting its usefulness as a comparative measure.

To properly and prudently evaluate Ameresco’s business, we encourage you to review our GAAP financial statements included above, and not to rely on any single financial measure to evaluate the business. Please refer to the above reconciliation of EBITDA to operating income, the most comparable GAAP measure.

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