The team hopes to make anaerobic digestion more efficient and profitable for farmers who convert manure to natural gas.
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Without policy support, plant operators in Michigan say they can’t compete with wind, solar and natural gas.
A northern Minnesota research lab’s biocoal product is impressive but will likely struggle to overcome economic challenges facing wood fuels. At a research lab in the northwoods of Minnesota, scientists are roasting tree waste until it turns into something that looks and burns like coal — without the heavy metal pollution. The finished product is called “biocoal” or “torrefied biomass,” and a team of University of Minnesota-Duluth researchers hope it might someday displace coal to fuel power plants, reinvigorating the region’s forestry economy and reducing carbon emissions at the same time. The work at the Natural Resources Research Institute lab, about 200 miles north of the Twin Cities, appears to be the latest technical advance for woody biomass. The team’s facility is able to produce as much as 6 tons per day of the biocoal, which has energy values similar to coal.
Minnesota utility regulators are studying a proposal by Xcel Energy to close two biomass plants that could mark a turning point for the industry here, particularly as prices for renewable energy drop.