Ameresco is an energy services and infrastructure company that helps customers reduce energy costs, upgrade aging facilities, and add on-site power generation. The company operates through two core activities: designing and installing energy efficiency systems (LED lighting, HVAC, building controls, cogeneration), and developing, owning, and operating small-scale renewable energy plants including solar PV, battery storage, and biogas/RNG facilities. Ameresco's customers are predominantly public sector — federal agencies, the U.S. military, state and local governments, and public universities — though commercial, industrial, and utility customers are a growing share. A key feature of Ameresco's model is the Energy Savings Performance Contract (ESPC), which structures projects so that energy cost savings fund the project cost, allowing government customers to upgrade infrastructure with little or no upfront capital. On the asset side, Ameresco owns and operates 227 plants with roughly 838 megawatts of capacity, selling electricity, heat, or gas under long-term PPAs and purchase agreements. Ameresco funds these owned assets primarily through non-recourse project-level debt and tax equity rather than corporate debt. The company also earns recurring revenue from multi-year operations and maintenance contracts. Ameresco operates across five segments: North America Regions, U.S. Federal, Europe (its fastest-growing segment), Renewable Fuels, and a smaller software and consulting business. Growth is focused on energy infrastructure for data centers, European expansion via a joint venture with Sunel, and broader energy resilience solutions including microgrids and large-scale battery storage.