August 29, 2021. Aemetis, Inc., a renewable natural gas (RNG) and renewable fuels company focused on negative carbon intensity products, has awarded a construction services contract to Machado & Sons Construction Inc. to build the company’s 32-mile biogas pipeline extension connecting multiple dairy digesters throughout Stanislaus and Merced Counties in California. The pipeline will transport the renewable biogas from the dairies to the Aemetis biogas upgrading facility at the Aemetis ethanol production plant in Keyes, California, where the biogas will be transformed into commercial-grade RNG for use as a carbon-negative transportation fuel for trucks, buses and cars.
After a procurement process that included proposals from ten pipeline construction companies, Aemetis selected Machado & Sons due to their extensive experience in utility-grade pipeline construction, as well as their successful completion of a separate CO2 pipeline from the Aemetis ethanol production facility in Keyes to the CO2 liquification gas plant built in 2019. Machado and Sons is also currently engaged as a key construction contractor for the Aemetis biogas upgrading facility.
The pipeline is part of the Aemetis Biogas Central Dairy Digester Project which is developing a network of lagoon digesters connected via a biogas pipeline to produce renewable natural gas. The RNG produced by the first two dairy digesters has been approved by the California Air Resources Board (CARB) at a negative 426 (-426) carbon intensity to displace petroleum based natural gas used at the Keyes ethanol production facility, and to provide carbon negative renewable fuel for compressed natural gas trucks and buses.
The planned 52 dairies in the Aemetis biogas project are expected to capture more than 1.4 million MMBtu of dairy methane and reduce greenhouse gas emissions equivalent to an estimated 5.2 million metric tonnes of CO2 each year. The captured methane will be transformed to carbon-negative transportation fuel to displace petroleum-based diesel throughout the State of California.
The 5.2 million metric tonnes of annual CO2 emissions reduction from the Aemetis Biogas project is estimated to reduce CO2 emissions equivalent to removing 1.1 million cars from the road.