# Ameresco Ameresco is an Asset Manager based in Framingham, United States. ## Overview - **Organization type:** Asset Manager - **Headquarters:** Framingham, United States - **Region:** North America - **Address:** Framingham, MA, United States - **Founded:** 2000 - **Assets under management:** Undisclosed - **Website:** ameresco.com ## Regulatory record - **Reports private funds:** No ## About Ameresco launched in 2000 when George Sakellaris, a veteran of the energy services industry, recognized that public institutions had enormous deferred maintenance liabilities and no budget to address them. The firm's business model turns that problem into a project pipeline: Ameresco conducts an energy audit, guarantees the savings, finances the upgrade, and recoups its investment from the reduced utility spend. This energy savings performance contract (ESPC) structure means the client faces no upfront cost, a proposition that proved particularly appealing to federal agencies, municipalities, and school districts. The company went public in 2010 and has since diversified from pure efficiency retrofits into asset ownership, developing utility-scale solar installations, landfill-gas-to-energy plants, and battery storage systems. The company operates across four segments — federal, state and local government, commercial, and its own independent power-producer assets. Solar photovoltaics and biogas now dominate the generation portfolio, though the firm continues to execute large decarbonization contracts, including work on U.S. Department of Energy sites and U.S. Navy installations. International efforts are concentrated in the U.K., where Ameresco has built combined-heat-and-power and district-energy projects. A high-profile recent project includes the design and construction of the University of Iowa's utility-scale solar farm, one of the largest higher-education renewable projects in the U.S. Ameresco employs roughly 1,500 people across offices in North America and the U.K. The firm rarely reports assets under management in the conventional sense, preferring to highlight its $4.3 billion in contracted revenue backlog and a growing portfolio of owned renewable-energy assets that generate recurring income through power-purchase agreements. September 2024: Completed the sale of a 250-megawatt portfolio of battery storage projects in Southern California to a joint venture between EQT Infrastructure and Temasek, monetizing developed assets while retaining a long-term operations and maintenance agreement (per the company, September 2024). Beyond its core contracting business, Ameresco maintains a small venture and innovation group that evaluates emerging technologies in microgrid controllers and advanced methane capture. Ameresco's structural distinction is its hybrid developer-contractor balance sheet. Unlike pure engineering firms that hand off assets at completion, Ameresco increasingly holds an ownership stake, layering asset-heavy, utility-like cash flows atop a project-based services revenue stream. This evolution — from energy service company to independent power producer — means the firm competes with traditional utilities for grid-scale projects while also maintaining the federal-ESPC franchise that generates its pipeline. That dual structure creates a sourcing advantage in distributed-energy markets, where clients want one counterparty to design, build, finance, and operate the physical plant. ## Sectors - Energy Transition & Renewables - Infrastructure ## Offices - London, United Kingdom ## People - George Sakellaris — President and CEO ## Questions ### How does Ameresco source its project pipeline? The firm's strongest origination channel is federal energy savings performance contracts, where it responds to competitive solicitations from entities like the U.S. Department of Energy and the Department of Defense. State and municipal procurement, education-system master-plans, and direct commercial negotiations supplement federal work. In the U.K., pipeline originates through public-sector frameworks and district-energy authorities. ### Does Ameresco participate in fund commitments or only direct projects? Ameresco deploys capital almost exclusively into direct project development and construction. The firm does not operate as a fund-of-funds and does not make LP commitments to external managers. Its owned-asset segment functions like an independent power producer, holding and operating generation facilities on its balance sheet. ### What investment stages and project sizes does Ameresco target? The firm targets mid-to-large-scale infrastructure projects, with individual contracts frequently exceeding $10 million and reaching into the hundreds of millions. A typical ESPC project runs 15–25 years, while owned solar and battery assets involve development capital followed by construction financing and a takeout structure. Revenue-contract backlog represents the forward value of signed, unexecuted work. ### What is Ameresco's known posture on co-investments alongside external partners? Ameresco routinely brings in institutional co-investors for large asset portfolios. The September 2024 battery-storage transaction with EQT Infrastructure and Temasek is a signature example — Ameresco developed the projects, sold a majority stake to the joint venture, and retained ongoing operations and maintenance, generating fee income while recycling development capital. ## Related profiles - [Triumph Financial](https://altss.com/profile/triumph-financial-inc) - [NexPoint Residential Trust](https://altss.com/profile/nexpoint-residential-trust-inc) --- Last updated: 2026-06-03T20:00:00.000Z Canonical page: https://altss.com/profile/ameresco-inc Maintained by Altss — https://altss.com — methodology: https://altss.com/methodology