Aemetis Biogas

We produce Renewable Natural Gas that reduces methane and other greenhouse gas emissions while providing economic security to local dairies.

  •  Renewable natural gas (RNG) accounted for 97% of all on-road fuel used in natural gas vehicles in California in 2023.
  •  Bio-CNG holds the lowest average carbon intensity of any clean fuel option on California’s roadways today and is the only fuel producing a negative carbon intensity fleet outcome in the California Low Carbon Fuel Standard (LCFS) Program, which includes ethanol, biodiesel, renewable diesel, bio-CNG, bio-LNG, electricity, alternative jet fuel and hydrogen.
  •  RNG made up 5.1% of all on-road alternative fuels dispensed by volume and it generated 19.2% of all carbon dioxide equivalent emission reductions of on-road alternative fuels reported under the California LCFS in 2023.
  •  When used as a transportation fuel, RNG displaces gasoline and diesel in applications that are difficult — if not virtually impossible — to electrify.
  •  California’s commercial fleets deploying trucks fueled by RNG are achieving a cost-effective, carbon-negative transportation outcome today without compromising existing business operations.
  •  Medium- and heavy-duty RNG-fueled trucks and buses perform at levels that are 90% below the federal nitrogen oxide standard and 90% below the federal particulate matter standard.
  •  Aggressive goals to decarbonized transportation over the next decade will only be achieved by prioritizing the transition of heavy-polluting, high mileage commercial fleets to cost-effective carbon-negative solutions like RNG-fueled trucks.

Source: 2024 Oil Price Information Service, LLC.

Aemetis Renewable Natural Gas (RNG) has a negative carbon intensity and is addressing the problem of harmful greenhouse gas emissions (GHG) while providing jobs and economic development. In 2020, the California Air Resources Board (CARB) approved Aemetis’s biogas pathway, utilizing a negative -426 carbon intensity score for the company’s first dairy digesters.

By the end of 2022, Aemetis will have seven operating dairy digesters with an additional 10 digesters in development or under construction, and a direct interconnection with Pacific Gas & Electric’s gas pipeline that will enable the gas to be transmitted statewide. With a fully built-out objective of constructing and operating over 60 dairy digesters, we estimate our RNG production will reach more than 1.5 million MMBTU annually by 2025.

Our RNG is produced by capturing methane from local dairies in California’s Central Valley, eliminating thousands of tons of harmful GHG emissions annually. Moreover, our RNG is produced continuously – 24 hours a day 365 days per year – without the intermittent issues inherent with some renewable energy sources such as wind or solar. RNG is pipeline quality gas that fits transparently into the existing natural gas infrastructure, making for a seamless transition from petroleum-based energy to negative carbon intensity clean fuels. As California has over 1,200 existing dairies, Aemetis is also providing additional economic security and environmental compliance for family farms in the region. Aemetis simultaneously provides jobs and cleaner air while contributing to our state’s climate objectives.

Aemetis produces RNG from dairy digesters throughout California’s Central Valley. Aemetis has built over 40 miles of underground biomethane pipeline that transports biogas to the company’s ethanol biorefinery in Keyes, California. At the biorefinery, the biogas is upgraded to pipeline quality RNG for distribution via an onsite interconnection with the PG&E gas pipeline or at an onsite RNG fueling station for use as renewable, below zero carbon intensity (CI) transportation fuel.

Our ability to fuel trucks with negative carbon intensity RNG will contribute to California’s goal of carbon neutrality by 2045 and will reduce transportation air pollution created by diesel emissions.

Aemetis Biogas


Aemetis Biogas LLC subsidiary formed to design, build, and operate dairy-based renewable natural gas (RNG) production and distribution assets.


Aemetis Biogas completes first two dairy digesters and four miles of private pipeline for Phase I of the dairy digester/RNG project. Begins utilizing dairy biogas at Keyes facility to replace petroleum natural gas.