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.