MEDIA ADVISORY / WEATHER ALERT Due to Weather, Dallas Water Utilities to Postpone Opening Ceremony for Biogas Energy Recovery Facility

Ameresco, Inc. (NYSE: AMRC)

         The planned ribbon cutting ceremony on Wednesday, Feb. 2 at Noon to
Notice:  commemorate the 4.3 MW biogas capture and refining facility is being
         postponed due to bad weather. A date for the new ribbon-cutting is to
         be determined.

Who:     Dallas Water Utilities

When:    New Date and Time is to be determined.

Where:   City of Dallas Water Utilities, 10011 Log Cabin Road

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.

    Source: Ameresco

Released February 1, 2011