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Montauk Renewables owns and operates facilities that capture gas from landfills and livestock-farm waste, then process it into pipeline-quality renewable natural gas (RNG). RNG accounts for most of its business and is used almost entirely as transportation fuel. Montauk secures biogas through long-term agreements with site owners and pays them royalties tied to energy and environmental-credit revenue. It also uses biogas to generate electricity, which utilities buy under long-term, fixed-price contracts with scheduled price increases.
Selling the energy is only part of the business: most revenue comes from government-created environmental credits associated with production. Montauk sells renewable-fuel credits called RINs to buyers including refiners Valero and ExxonMobil, both significant customers. It shares some credit proceeds with partners that arrange for its RNG to be used as transportation fuel. Gas sales generally follow natural-gas market prices, while credit revenue depends heavily on credit prices and program rules.
The business also depends on continued access to biogas. Projects at landfills operated by Waste Management and Republic Services together generate most of Montauk’s revenue. To generate and sell fuel credits, Montauk must maintain regulatory eligibility and document that its RNG was dispensed through qualifying channels; pipeline injection alone does not make RINs valid for sale.
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.
OPAL Fuels and Montauk compete for landfill and dairy biogas, converting it into renewable natural gas (RNG) and electricity and selling the associated environmental credits. Watch OPAL’s gas-rights and manure-supply deals: they show competition for the feedstock Montauk needs to grow.
Clean Energy Fuels and Montauk both depend on demand for RNG as vehicle fuel and the environmental credits it generates; Clean Energy supplies U.S. and Canadian medium- and heavy-duty vehicle fleets, while Montauk mainly sells RNG into transportation. Watch Clean Energy’s RNG dispensing to fleets, because filling vehicle tanks is what generates those credits.
Montauk depends on Waste Management’s landfill operations for projects that generated 36.8% of its 2025 revenue; Waste Management collects and disposes of waste for customers and also develops its own biogas-conversion projects. Watch whether it offers landfill gas rights to Montauk or develops those sites itself, which can limit Montauk’s growth opportunities.
Ameresco competes directly with Montauk for landfill-gas and RNG projects through its Renewable Fuels business, which owns plants selling RNG and electricity. Watch that business’s project wins and fuel sales rather than Ameresco’s broader energy-efficiency work for government and commercial customers.
Montauk relies on Republic Services’ landfills for two RNG projects that generated 19.9% of its 2025 revenue, while the waste collection and disposal company also develops competing landfill-gas projects with bp. Watch Republic’s landfill operations and joint-venture development plans: they matter to Montauk’s existing gas supply and access to future sites.
Valero buys the environmental credits Montauk earns from renewable fuel, contributing about 17.4% of Montauk’s 2025 operating revenue; Valero makes transportation fuels and sells them to wholesalers, retailers and bulk buyers. Watch its credit purchases from Montauk, since Montauk’s short-term RIN contracts mean its largest buyers can change from year to year.
ExxonMobil buys Montauk’s renewable-fuel credits, known as RINs, and those purchases accounted for about 11.3% of Montauk’s 2025 operating revenue. The oil and gas producer also makes and sells petroleum products; changes in its RIN purchases from Montauk matter more to this tie than its broader production results.
Valero Energy Corporation earningsVLO
Valero’s report can offer clues about fuel activity and credit demand in the market for Montauk Renewables’ environmental attributes, but it will not show how much Valero bought from Montauk.
Look for changes in Valero’s transportation-fuel business and what it says about demand for renewable-fuel credits. These are market clues, not a record of Valero’s purchases from Montauk. Stronger fuel activity and credit demand would point to a more supportive buyer market for Montauk’s environmental attributes; weaker activity would suggest less support. The conclusion is about the market backdrop, not Montauk’s actual sales to Valero.
Waste Management, Inc. earningsWM
Waste Management’s report can show how its landfill operations and project strategy may affect Montauk Renewables’ access to landfill gas and future sites.
Look for Waste Management’s discussion of landfill operations and its own biogas projects; only disclosed site arrangements can confirm a change in Montauk’s gas supply or project access. Continued operations and work with outside developers would support Montauk’s access to gas and future sites. More self-development by Waste Management, or disruption at its landfills, could limit that access. The conclusion is whether this major site operator leaves Montauk’s supply and growth options more secure or more constrained.
Montauk Renewables, Inc. earningsThis company
Montauk Renewables’ report will show whether its RNG output is converting into more environmental-attribute revenue and stronger segment profit.
Read RNG production alongside the realized price of RINs, or renewable identification numbers, and operating cost per unit. The timing of RIN transfers can also shift revenue and profit between periods. More production with stronger realized prices and controlled unit costs means output is translating into profit; more production offset by lower RIN prices or higher costs means the economics have not improved. The conclusion is whether Montauk is turning RNG output into earnings.
Clean Energy Fuels Corp. earningsCLNE
Clean Energy Fuels’ report can show whether fleets are using more RNG, a signal about the vehicle-fuel outlet and credit demand that Montauk Renewables also relies on.
Look for whether Clean Energy Fuels supplies or dispenses more RNG to fleets, using any reported dispensing figures alongside its business trends. More fleet use means the shared vehicle-fuel outlet is more active and supports generation of related environmental credits; flat or lower use points to weaker demand in that channel, but does not establish Montauk’s sales. The conclusion is whether the vehicle-RNG market both companies rely on is expanding.
OPAL Fuels Inc. earningsOPAL
OPAL Fuels’ report can show whether it is securing more landfill gas and manure, revealing how competition for feedstock Montauk Renewables needs to grow is changing.
Look for OPAL Fuels’ disclosed landfill-gas rights, manure-supply agreements and related project progress. More feedstock or gas-rights deals would show a competitor securing inputs Montauk also needs, making future access more contested. Fewer such developments would mean less visible expansion, not proof that Montauk can secure the gas. The conclusion is whether OPAL is intensifying competition for shared feedstock.
