Ameresco, Inc. provides comprehensive energy services for businesses and organizations in North America and Europe. 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 a