Ameresco, Inc. is an energy infrastructure solutions provider. The Company's portfolio includes implementing smart energy efficiency solutions, upgrading aging infrastructure, and developing, constructing, and operating distributed energy resources. Its North America Regions, U.S. Federal and Europe segments include the design, engineering and installation of equipment and other measures to improve the efficiency and control the operation of a facility's energy infrastructure, renewable energy solutions and services and the development and construction of small-scale plants. Its Renewable Fuels segment, formerly Alternative Fuels segment, sells electricity and processed renewable natural gas (RNG) derived from biomethane from small-scale plants that it owns and operates and provides operations and maintenance services for customer-owned small-scale plants. The Company's All Other segment offers consulting services and the sale of solar photovoltaic energy products and systems.