Agresti Energy converts cellulosic waste into renewable natural gas — faster, cleaner, and more efficiently than any technology available today.
Our technology
Agresti Energy's Fiber Conversion Process (FCP) converts cellulosic biomass — the most abundant waste stream on Earth — into renewable compressed natural gas (CNG). No food crops. No burning. No burial.
The FCP combines subcritical wet oxidation, weak acid hydrolysis, and anaerobic digestion in a continuous plug-flow reactor. The two core components are the Fiber Conversion Reactor (FCR), which converts cellulosic solids into sugars, and an Up-flow Anaerobic Sludge Blanket (UASB) digester, which converts those sugars into biogas.
The process is energy-balanced and autogenous: gravity provides the subcritical pressure, and the feedstock itself supplies the heat for the hydrolysis reaction. No external energy is required for the chemical conversion.
By the numbers
Figures derive from EPA pathway documentation and 15+ years of operating data — not modeled projections.
Proven design, now in its third generation.
Successful operation across EPA, DOE, and international programs.
Facility-level energy out vs. in. Most biofuels: 1–5.
Renewable energy produced annually per single-reactor facility.
Generated annually per single-reactor facility.
vs. petroleum baseline, depending on feedstock and end-fuel.
From start of engineering to a commissioned full-scale facility.
AFOT unit, EPA RFS pathway, US patent pending, PCT international pending.
How it works
Background & development
EPA/DOE-sponsored pilot of the original plug-flow vertical long tube reactor (Vertech). Successfully demonstrated subcritical wet oxidation for sludge destruction.
Reactor relocated to process sludge for the Veluwe WaterBoard. Treated 32,000 dry metric tons annually, reducing sludge to inert ash (<4% of original volume).
James Titmus patented the addition of hydrolysis to the reactor (Gravity Pressure Vessel / GPV), targeting ethanol from municipal solid waste.
Dr. Roelof Niezen led extensive engineering and laboratory testing in Hardenberg, Netherlands. Hundreds of feedstock optimization tests achieved 90%+ conversion yields. Now Agresti's Technical Director.
EPA RFS pathway approved, US and PCT international patents pending, third-generation FCR designed, and AFOT (Facility Optimization & Training) unit in development.
Feedstocks & market
Open conversations
We are in active discussions across three distinct partner archetypes. If your organization fits one of the profiles below, we'd like to talk.
Funding the buildout of commercial FCP facilities. We are actively raising to scale from validated pilot to first-of-a-kind commercial deployments — with a defensible IP position, EPA pathway, and long operating record behind every dollar.
Get in touchWaste producers facing rising disposal costs and environmental compliance pressure. Agricultural operations, municipal water utilities, food and beverage processors, and paper mills can convert a liability into a long-term offtake revenue stream.
Get in touchEnergy offtakers, EPC firms, and project developers seeking RFS-qualified renewable fuel volume. We're structuring multi-site deployment programs with utilities and developers ready to move on shovel-ready cellulosic capacity.
Get in touchNews & announcements
Agresti Energy announced the successful completion of its International Patent Application, expanding global IP protection of its Fiber Conversion Process (FCP). The patent secures exclusive rights to its third-generation vertical reactor design — technology that transforms cellulosic waste into renewable natural gas while neutralizing PFAS, pathogens, pharmaceutical residues, and heavy metals.
Read the releaseAfter 31 months of analysis, the U.S. EPA approved Agresti Energy's Pressure Hydrolysis Process for a proprietary Renewable Fuel Pathway, qualifying it to generate D3 cellulosic RINs for the U.S. transportation industry.
Read the releaseRegulatory validation and federal collaboration history — the credentials due-diligence reviewers look for first.
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