Ameresco to Announce Fourth Quarter and Full Year Financial Results on February 29, 2012

FRAMINGHAM, MA – February 15, 2012 – Ameresco, Inc. (NYSE:AMRC), a leading energy efficiency and renewable energy company, today announced that it will release its fourth quarter and full year financial results before the market opens on Wednesday, February 29, 2012. Once announced, the earnings press release will be available on the “Investor Relations” section of www.ameresco.com. The Company will host an earnings conference call at 8:30 a.m. ET the same day.

On the call, President and Chief Executive Officer George Sakellaris and Vice President and Chief Financial Officer Andrew Spence will discuss Ameresco’s financial results as well as business outlook and strategy.

In conjunction with its quarterly earnings conference call and press release, the Company will provide management’s prepared remarks concerning quarterly results. These prepared remarks will be furnished on a Current Report on Form 8-K and also posted to the “Investor Relations” section of the Company’s website at www.ameresco.com. This process is designed to provide investors and analysts with enhanced access to financial results and non-financial metrics as well as additional insight into the Company’s performance in advance of its earnings conference call.

About Ameresco, Inc.

Founded in 2000, Ameresco, Inc. (NYSE:AMRC) is a leading independent provider of comprehensive services, energy efficiency, infrastructure upgrades, and renewable energy solutions for facilities throughout North America. Ameresco’s services include upgrades to a facility’s energy infrastructure and the development, construction and operation of renewable energy plants. Ameresco has successfully completed energy saving, environmentally responsible projects with federal, state and local governments, healthcare and educational institutions, housing authorities, and commercial and industrial customers. With its corporate headquarters in Framingham, MA, Ameresco provides local expertise through its 59 offices in 34 states and five Canadian provinces. Ameresco has more than 850 employees. For more information, visit www.ameresco.com.