EnTech Solutions, Northern Biogas, Dane County unveil RNG facility

EnTech Solutions, Northern Biogas, and Dane County, Wisconsin have unveiled a new dairy waste-to-RNG facility.

The organisations worked together to repurpose an AD facility (the Middleton facility), which formerly produced electricity, to generate clean RNG using agricultural waste from four local dairy farms.

The Middleton facility incorporates advanced technology, including a nutrient concentration system that returns clean water to the region’s Yahara Watershed while also reducing phosphorus run-off to nearby streams and lakes. In 2021, over 27 million gallons of manure was processed by the facility, removing more than 57,000 pounds of phosphorus from the watershed.

EnTech Solutions has incorporated a renewable energy microgrid at the plant, 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 score.

Overall, the facility will reduce emissions by more than 13,500 tonnes per year of CO2 equivalent. The reduction is equivalent to removing emissions of nearly 34 million miles driven by cars.

“Water and soil are essential to life on earth and farmers continue to look for opportunities to improve water quality and soil health,” said Jeff Endres, co-owner of Endres Berryridge Farms.

“Northern Biogas and EnTech Solutions have opened up high-tech opportunities around dairy manure, working with area farmers to harvest the methane and return the fibre and liquid nutrients back to the farmers for use as an organic fertiliser and bedding, maximising all aspects of the nutrient cycle.”

The facility’s RNG is trucked to Dane County’s landfill offload station, where it is injected through the county’s equipment into the interstate transmission pipeline to be used as a renewable fuel. U.S. Gain offtakes the RNG and markets it to California’s transportation sector.

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