Ameresco is an energy infrastructure company that helps government, utility, and commercial customers reduce energy costs and transition to renewable energy through energy efficiency retrofits, renewable energy development, operations and maintenance services, and energy management software. The company designs and implements projects including HVAC optimization, LED lighting, building automation, solar, wind, and other renewable energy plants—often financing these solutions through energy savings performance contracts where customer savings offset project costs, or through long-term power purchase agreements for electricity and renewable fuels from Ameresco-owned generation assets. Revenues come primarily from government agencies (roughly 60%), with the remainder from utilities, data centers, healthcare, and commercial clients across North America and Europe.