Repurposed digester to produce clean, renewable natural gas

EnTech Solutions, Northern Biogas, and Dane County are teaming up to support sustainable clean energy by repurposing an agricultural biodigester, according to a release from EnTech Solutions. The repurposed digester in the town of Springfield formerly produced electricity and will now be a fully-funded renewable natural gas (RNG) producer using agricultural waste from four local dairy farms.

In 2021, over 27 million gallons of manure were processed by the biodigester, removing more than 57,000 pounds of phosphorus from the watershed. EnTech Solutions incorporated a renewable energy microgrid at the digester facility, featuring solar panels and batteries which provide more than 2.8 MW of clean energy generation, the equivalent of powering more than 400 homes. This creates a carbon-negative process that results in RNG with a lower carbon intensity (CI) score. Overall, the facility will reduce emissions by more than 13,500 metric tons per year of carbon dioxide equivalent. The reduction is equivalent to removing emissions of nearly 34 million miles driven by cars.