Ameresco, Inc. Announces Pricing of Initial Public Offering

FRAMINGHAM, Mass.–(Business Wire)–
Ameresco, Inc. (NYSE:AMRC) today announced the pricing of its initial public
offering of 8,696,820 shares of its Class A common stock at $10.00 per share. Of
the shares being sold, Ameresco is selling 6,000,000 shares and selling
stockholders are selling 2,696,820 shares. Ameresco will not receive any
proceeds from the sale of shares by the selling stockholders. The underwriters
have the option to purchase up to 1,044,523 additional shares from Ameresco and
up to 260,000 additional shares from certain selling stockholders at the initial
public offering price, less the underwriting discount, to cover overallotments,
if any. Ameresco`s Class A common stock will begin trading on July 22, 2010 on
the New York Stock Exchange under the symbol “AMRC.” The offering is expected to
close on July 27, 2010.

BofA Merrill Lynch is acting as the sole book-running manager. RBC Capital
Markets is acting as lead manager for the offering, and Oppenheimer & Co.,
Canaccord Genuity, Cantor Fitzgerald & Co., Madison Williams and Company and
Stephens Inc. are acting as co-managers of the offering.

A registration statement relating to these securities has been filed with, and
declared effective by, the Securities and Exchange Commission. The offering of
these securities may be made only by means of a prospectus. A copy of the final
prospectus relating to the offering, when available, may be obtained from BofA
Merrill Lynch at 4 World Financial Center, New York, NY 10080, Attn: Prospectus
Department, or by emailing dg.prospectus_requests@baml.com.

This press release shall not constitute an offer to sell or the solicitation of
an offer to buy, nor shall there be any sale of these securities in any state or
jurisdiction in which such an offer, solicitation or sale would be unlawful
prior to registration or qualification under the securities laws of any such
state or jurisdiction.

About Ameresco, Inc.

Ameresco, Inc. was incorporated in Delaware in April 2000 and is a leading
independent provider of comprehensive energy efficiency solutions for facilities
throughout North America. Ameresco`s solutions include upgrades to a facility`s
energy infrastructure, and the construction and operation of renewable energy
plants. With corporate headquarters located in Framingham, MA, Ameresco has 54
offices in 29 states and four Canadian provinces. For more information, visit
www.ameresco.com.

Ameresco, Inc.
Media Relations:
CarolAnn Hibbard, 508-661-2264
news@ameresco.com
or
Investor Relations:
Andrew Spence, 508-661-2212
ir@ameresco.com

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