WELTEC BIOPOWER hands over dairy RNG plant in Wisconsin , USA
In February 2025 , the German biogas specialist WELTEC BIOPOWER has successfully completed the commissioning and handover of a dairy RNG ( Renewable Natural Gas / biomethane ) plant in Barron County , Wisconsin .
In February 2025 , the German biogas specialist WELTEC BIOPOWER has successfully completed the commissioning and handover of a dairy RNG ( Renewable Natural Gas / biomethane ) plant in Barron County , Wisconsin . After just four months of construction , the dairy farm produces 2.36 million standard cubic meters of RNG / biomethane annually ( 86,600 MMBTU per year ). This RNG , above gas grid specifications , is processed using advanced membrane-based gas upgrading technology to deliver 272 standard cubic meters per hour ( 159 SCFM ), which is compressed , bottled and transported to a gas grid injection point . This strongly carbon-negative RNG is drawn off the gas grid elsewhere , significantly enhancing the sustainability of the transportation fleets of the buyers .
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Sustainable agricultural practices
The farm currently has a herd of 3,400 cattle , primarily Holsteins along with a select number of Swiss cows . The owners previously operated an AD plant producing electricity for on-site use , so the concept was not new for them . “ For years , we have been utilizing cattle manure to generate biogas , meeting our farm ’ s electricity and heating needs while also fertilizing our fields with digestate ,” said the owner . “ With the new RNG facility , we have expanded our digestate utilization on a larger scale and now store it in our dedicated lagoon for optimal land application .”
Four months construction time thanks to modular design
WELTEC BIOPOWER constructed three 6850 cubic meter ( 1.8m USG ) duplex stainless steel digesters for the new biomethane plant near Rice Lake : “ We constructed the tanks using a ring-by-ring assembly approach , with the final step involving the installation of a gas-tight membrane storage roof ,” explains responsible WELTEC BIOPOWER North America COO Carsten Hesselfeld . With a diameter of 31.48 meters , the 8.8 meter high , insulated stainless steel tanks each have a gas storage volume of 3320 cubic meters . “ Our modular construction method , tried and tested worldwide over the past 20 + years , contributed significantly to the short construction time of the plant ,” emphasizes Hesselfeld . The plant is designed to process 207,000 metric tonnes of cattle manure