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Ameresco helps government agencies, institutions, utilities and businesses in North America and Europe reduce energy and operating costs. Most revenue comes from customer projects: it designs and installs building-system upgrades and energy plants. Under energy savings performance contracts, expected savings are designed to cover all or nearly all project costs, and Ameresco typically guarantees agreed efficiency performance. Third-party financing can limit customers’ upfront spending. After construction, customers may pay Ameresco to operate and maintain the facilities under multiyear contracts.
Ameresco also owns small renewable-energy plants and sells their electricity, heat and renewable gas to utilities, government bodies and other energy buyers, often under long-term contracts. It processes purchased biogas into energy or renewable fuel. Selling renewable-energy certificates and other environmental credits generated by its assets supplies a substantial part of earnings; their availability and value depend on regulatory programs as well as plant output.
Government entities supply most revenue, and the U.S. federal government is a significant customer. Project work depends on customer financing, public budgets and procurement rules that allow customers to pay for improvements from future savings. Federal contracting agreements alone do not authorize work: individual projects require agreed agency orders. Projects also require local permits and approvals before they can proceed.
The risk section is the longest, dullest part of the filing. This keeps only what can really hurt you: where it hits, how hard, when it plays out.
Every company claims an edge. Each one is checked against hard numbers like margins and returns: which hold, and which line gives way first.
Ameresco’s results depend chiefly on turning government and institutional energy-upgrade awards into completed projects; privately held McKinstry is another important competitor to watch that this list cannot show.
Johnson Controls challenges Ameresco for commercial and government customers’ building-efficiency projects, controls upgrades and maintenance work. Watch its retrofit and service business, where selling and installing heating and cooling systems can lead to repeat maintenance revenue.
Legence’s CMTA business competes with Ameresco for institutional and government building-efficiency projects; Legence engineers, installs and maintains building systems. Its education and state-and-local-government revenue is more relevant to this overlap than its data-center business.
ABM Industries competes with Ameresco through its Technical Solutions business in facility-efficiency upgrades, heating and cooling services and microgrids. Watch those energy and infrastructure offerings for education and commercial customers, rather than ABM’s broader cleaning business.
Trane Technologies competes with Ameresco for customers’ building energy services, heating and cooling upgrades and efficiency improvements using controls. Its Americas commercial HVAC, building-controls and energy-services businesses are the relevant areas to watch, rather than transport refrigeration.
Honeywell’s building-automation business competes with Ameresco for customers’ smart-building efficiency projects and ongoing operations and maintenance. Watch its building-performance and smart-maintenance offerings, including Honeywell Forge software that connects building equipment data.
Montauk Renewables competes with Ameresco for landfill biogas rights, then processes that gas into renewable natural gas or electricity for sale. Watch its fuel-supply agreements: Montauk warns that competition can raise royalties on renewed or expanded agreements and reduce project profitability.
OPAL Fuels competes with Ameresco for biogas projects and operates plants that sell renewable natural gas and electricity, including power sold to public utilities. Watch its gas-rights and RNG marketing agreements, where its ability to both produce and dispense fuel helps it compete for projects.
EMCOR competes with Ameresco for customers’ building-energy maintenance work and also installs overlapping heating and cooling, controls and central-plant systems. Its building-services business is the area to watch for this maintenance rivalry, rather than treating all its electrical and mechanical construction as comparable.
Limbach overlaps with Ameresco in engineering, upgrading and maintaining building owners’ mechanical, electrical and controls systems, with a stronger focus on existing facilities. Work contracted directly by owners, primarily for existing buildings, accounted for 75.1% of Limbach’s 2025 revenue and is the clearest business to watch.
Comfort Systems USA competes with Ameresco for building-system operations and maintenance, while also installing heating and cooling, electrical and controls systems for customers. Its healthcare, education and government work offers a closer comparison with Ameresco’s institutional customers than its larger technology business.
Carrier’s NORESCO unit competes directly with Ameresco for customers’ comprehensive building-efficiency projects. Keep the unit in focus: new equipment supplied 72% of Carrier’s 2025 net sales, so Carrier’s overall results are not a close readout of this project rivalry.
Project financing costs and investment demand matter to both HASI and Ameresco: HASI invests for long-term cash returns in energy-efficiency, distributed solar and storage assets of the kinds Ameresco builds and operates. Watch HASI’s investments in projects serving building owners or occupants, without assuming it finances Ameresco directly.
PowerBank overlaps with Ameresco in developing, building, maintaining and owning distributed solar and battery projects for North American power purchasers. Watch its construction and maintenance fees alongside revenue from selling power to corporate and utility customers, since it earns from both project delivery and ownership.
SolarMax overlaps with Ameresco in designing, procuring equipment for and constructing commercial battery-storage and solar projects for customers. Its Texas Longfellow battery contract generated 66.1% of 2025 revenue, all in the second half, making progress on that contract more informative than its California residential solar installations.
Argan overlaps with Ameresco in power-project engineering, construction and maintenance, including solar, battery and biofuel facilities, but focuses on larger plants. Watch its Power segment’s work for independent power producers and public utilities, keeping that scale difference in mind when comparing project delivery.
Clean Energy Fuels shows the fleet-demand side of Ameresco’s renewable-natural-gas market: it buys and distributes fuel to vehicles, while Ameresco produces RNG that can serve that market. Watch RNG dispensed to trucking, refuse and transit fleets, since environmental credits are generated when the fuel reaches vehicle tanks; this does not establish a direct supply agreement.
NextEra Energy competes with Ameresco for solar and battery-storage projects through its renewable-energy business. Focus on that business rather than FPL, its regulated utility selling electricity to Florida customers, which adds substantial exposure unrelated to this rivalry.
NextEra Energy, Inc. earningsNEE
NextEra Energy’s renewable-energy business competes with Ameresco for solar and battery-storage projects, and its report will show whether that rivalry is intensifying or easing.
Focus on NextEra Energy’s renewable-energy business, not FPL, its utility that sells electricity to Florida customers. Stronger project activity would point to tougher competition for Ameresco’s solar and storage work; weaker activity could ease that pressure, but might also reflect softer demand for projects. The question is whether a rival is pulling back or the project market itself is cooling.
Johnson Controls International plc earningsJCI
Johnson Controls competes with Ameresco for commercial and government building-efficiency upgrades and maintenance, and its report will show whether customers are still spending and rivals are winning work.
Look at Johnson Controls’ retrofit and service work. Growth in both would show that commercial and government customers are still paying for building upgrades and maintenance, while also facing Ameresco with a stronger competitor for that work. A slowdown could ease competition, but may instead mean customers are postponing projects. The takeaway is how customer demand and competitive pressure are each changing.
OPAL Fuels Inc. earningsOPAL
OPAL Fuels competes with Ameresco for biogas projects and sells the gas as renewable natural gas or electricity; its project activity and agreements will show how that rivalry is changing.
Watch OPAL Fuels’ biogas projects, gas rights and renewable natural gas marketing agreements. More project activity or tighter agreement terms would suggest stronger competition for biogas resources, potentially making it harder or costlier for Ameresco to secure suitable feedstock. Less competition could ease that pressure, but could also signal a cooler project market. The conclusion is how much project and feedstock competition Ameresco’s renewable-fuels business faces.
Clean Energy Fuels Corp. earningsCLNE
Clean Energy Fuels sells and dispenses fuel to fleets, so its RNG volumes show whether truck, refuse and transit fleets are using more renewable natural gas—a potential outlet for Ameresco’s output.
Watch how much renewable natural gas Clean Energy Fuels dispenses to trucking, refuse and transit fleets. More volume would show greater end-user demand and a potentially broader market for Ameresco’s output; less would point to softer demand, leaving producers to find other buyers or rely more on wholesale markets. This is a demand signal, not evidence of a direct supply deal between the companies.
HA Sustainable Infrastructure Capital, Inc. earningsHASI
HA Sustainable Infrastructure Capital invests in efficiency, distributed-solar and storage projects, and its report will show whether outside capital is still backing the kinds of projects Ameresco builds.
Look for HA Sustainable Infrastructure Capital’s investments in efficiency, solar and storage projects serving building owners or occupants. More investment would suggest capital is still available for these projects, potentially making third-party financing easier for Ameresco’s customers to arrange; less could make financing harder and delay projects. Its report signals market appetite, not direct financing for Ameresco.
Ameresco, Inc. earningsThis company
Most of Ameresco’s revenue comes from projects, and this report will show whether its contracted work is becoming profitable revenue that also turns into cash.
Read project revenue alongside gross margin, then check operating cash flow against unbilled revenue. Rising project revenue with a steady margin would show Ameresco is delivering more work without giving up much project profit; rising revenue with a falling margin would point to weaker project economics. Weak cash flow alongside higher unbilled revenue would mean cash is lagging further behind recognized revenue. The conclusion is whether project growth is bringing in both profit and cash.
