Ameresco, Inc. operates as a clean technology integrator, offering a broad spectrum of solutions focused on energy efficiency and sustainable energy generation across the United States, Canada, and global markets. The company serves diverse businesses and organizations by implementing strategies for enhanced energy efficiency, critical infrastructure improvements, bolstered energy security and resilience, improved asset longevity, and the deployment of renewable energy systems. Its operations are structured into distinct segments: U.S. Regions, U.S. Federal, Canada, and Non-Solar Distributed Generation. Ameresco specializes in the conceptualization, development, engineering, and installation of projects specifically designed to lower energy consumption and decrease operational and maintenance (O&M) expenses for client facilities. These projects typically involve tailored interventions aimed at optimizing the performance of critical building infrastructure, including heating, ventilation, cooling, and lighting systems. Additionally, Ameresco delivers comprehensive renewable energy services. This encompasses building small-scale power generation facilities, either owned directly by the company or constructed for clients, to produce electricity, gas, heat, or cooling from sustainable sources. They also provide ongoing operations and maintenance for these plants and market the generated renewable electricity, processed gas fuel, or thermal energy. Beyond this, the company distributes photovoltaic (PV) solar products and integrated systems, offers specialized consulting, and provides enterprise-level energy management solutions. Notably, Ameresco also owns and manages a wind power facility situated in Ireland. Its broad client base includes federal, state, and local governmental bodies, healthcare organizations, educational establishments, airports, public housing entities, universities, and a wide spectrum of commercial and industrial clients. By the close of 2021, specifically December 31st, Ameresco's portfolio featured 147 wholly-owned and operated small-scale renewable energy facilities and solar photovoltaic installations. Founded in 2000, Ameresco, Inc. maintains its corporate headquarters in Framingham, Massachusetts.