EPA Approves RFS Fuel Pathway for Agresti Energy


On March 15, the U.S. EPA approved a fuel pathway under the Renewable Fuels Standard filed by Agresti Energy for the generation of Cellulosic D3 Biofuel Renewable Identification Numbers (RINs) for gas Natural Renewable Tablet (GNR) produced via a proprietary process that utilizes hydrolysis and anaerobics. digestion.

A document released by the EPA indicates that the pathway approval applies specifically to facilities proposed by Agresti Energy in Stevens County, Minnesota; Swift County, Minnesota; and Jasper County, Indiana.

In the pathway approval document, it is explained that Agresti Energy’s process uses agricultural digestate as feedstock, which is digestate resulting from the anaerobic digestion of crop residues, separated garden waste and/or animal manure. The digestate feedstock is subjected to pressure hydrolysis, which uses wet oxidation and weak acid hydrolysis at high temperature and pressure to break down lignin and convert hemicellulose and cellulose to sugar, according to the EPA. The resulting cellulosic sugar solution is injected into an anaerobic digester, where the sugar is converted into biogas. The biogas is then purified and compressed.

EPA analysis determined that compressed RNG produced through the Agresti Energy AD pathway achieves a 60.2% reduction in greenhouse gases (GHGs) compared to a 2005 diesel benchmark.

A copy of the track approval document can be downloaded from the EPA website.