Ameresco, Inc. provides comprehensive energy services for businesses and organizations in the United States, Canada, and internationally. It offers energy efficiency, infrastructure upgrades, energy security and resilience, asset sustainability, and renewable energy solutions. The company operates through U.S. Regions, U.S. Federal, Canada, and Non-Solar Distributed Generation segments. It designs, develops, engineers, and installs projects that reduce the energy, as well as operations and maintenance costs of customers' facilities. The company's projects primarily include various measures customized for the facility and designed to enhance the efficiency of building systems, such as heating, ventilation, cooling, and lighting systems. It also offers renewable energy products and services, such as the construction of small-scale plants for customers that produce electricity, gas, heat, or cooling from renewable sources of energy; and sells electricity and processed renewable gas fuel, heat, or cooling. In addition, the company provides integrated- photovoltaic (PV) and consulting, and enterprise energy management services; sells solar PV energy products and systems; and owns and operates a wind power project located in Ireland. It serves federal, state, and local governments, as well as healthcare and educational institutions, airports, public housing authorities and public universities, and commercial and industrial customers. As of December 31, 2020, the company owned and operated 130 small-scale renewable energy plants and solar PV installations. Ameresco, Inc. was founded in 2000 and is headquartered in Framingham, Massachusetts.