The Company is conducting, but has not completed, an analysis of the materiality of the change in accounting treatment for the interest rate swap entered into in March 2010 for its 2010, 2011 and 2012 financial results and whether any prior period adjustments would be necessary. It also has not completed its analysis of whether any prior period adjustments, if necessary, would require filing amended periodic reports with the Securities and Exchange Commission.As a result of its retrospective determination that the interest rate swap did not qualify for the “short-cut” method, the Company expects it will redesignate the swap using the “long-haul” method in the first quarter of 2013. In that case, the swap would be subject to periodic effectiveness testing and qualify, prospectively, for hedge accounting treatment. Once the Company has completed its analyses, it expects to announce the date that it will release fourth quarter and full year 2012 financial results and host an 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, asset sustainability, 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 63 offices in 34 states and five Canadian provinces. Ameresco has more than 900 employees. 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 the ongoing evaluation of Ameresco’s current and historical accounting treatment of interest rate swaps and the outcome and timing of such evaluation, as well as other statements containing the words “projects,” “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 the impact of the announced postponement in Ameresco’s earnings release and the material weakness in Ameresco’s internal control, as well other factors discussed in Ameresco’s Annual Report on Form 10-K for the year ended December 31, 2011, filed with the U.S. Securities and Exchange Commission on March 15, 2012 and in its quarterly reports on Form 10-Q. 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.