Aemetis installs MVR system to cut gas use 80% at Keyes ethanol plant
Aemetis (NASDAQ: AMTX) has received the principal components for a $40 million mechanical vapor recompression (MVR) system at its 65-million-gallon-per-year ethanol plant in Keyes, California. The equipment delivery, which includes six 3,500-horsepower electric turbofans, marks a material step toward a year-end 2026 commissioning target that the company says will transform the plant's energy and carbon economics.
MVR is a heat-recovery technology that recycles and compresses waste vapour to generate usable steam, displacing the direct combustion of natural gas. At Keyes, the six turbofans will heat alcohol vapours electrically rather than through a gas burner. Aemetis projects the system will cut the plant's natural gas consumption by roughly 80%, reduce the carbon intensity (CI) of its fuel ethanol output, and lift annual operating cash flow by $32 million once fully operational.
The deal
The project has drawn $19.7 million in grants and tax credits from three sources: the California Energy Commission, utility Pacific Gas & Electric, and the US Internal Revenue Service via Section 48C investment tax credits, a federal credit for clean-energy manufacturing and industrial-decarbonisation projects. The remaining capital requirement was not broken down between debt and equity in the release.
Two further federal and state incentives directly reward the CI reduction. A lower carbon score earns more credits under California's Low Carbon Fuel Standard (LCFS), a cap-and-trade scheme that prices the difference between the CI of a fuel and a declining annual benchmark. Aemetis also cited the Section 45Z Clean Fuel Production tax credit, introduced under the Inflation Reduction Act, which ties the credit value to a fuel's CI score, meaning a lower score translates directly into a higher per-gallon credit. The combination makes CI reduction at a California ethanol plant simultaneously a compliance-market and a federal-subsidy play.
Chairman and chief executive Eric McAfee said MVR is being adopted across the ethanol industry for energy savings and the economic incentives tied to lower emission rates, and that Aemetis is among the first North American producers to install the system.
Market context
The US corn-ethanol sector has faced persistent margin pressure from volatile feedstock costs and fuel-blending economics. Retrofitting plants with energy-efficiency technologies such as MVR, combined heat-and-power, or carbon-capture systems has emerged as a route to improve margins without building new capacity. Several independent and co-operative ethanol producers are pursuing similar upgrades, driven by the same LCFS and 45Z credit stack that Aemetis is targeting.
The Keyes plant already captures more than 100,000 tonnes per year of carbon dioxide for use as beverage-grade CO2, and produces around 2 million pounds per day of distillers' grain animal feed for California dairies. Aemetis is separately developing a sustainable aviation fuel (SAF) plant and a CO2 sequestration project in California, using ethanol-production by-products as feedstocks. SAF projects that use a lower-CI ethanol input would themselves attract stronger 45Z credits, creating a stacked incentive across the company's project pipeline.
The $32 million projected cash-flow improvement is a forward-looking figure that will depend on the LCFS credit price, the prevailing 45Z credit value, and the actual natural gas displacement achieved once the system is commissioned. Investors and credit-market participants will look to the year-end commissioning date and the first post-upgrade CI score verification as the key near-term milestones.