A German bioenergy company’s reboot would make ethanol and renewable natural gas, though questions remain about its life-cycle climate and environmental impacts.
By Karen Uhlenhuth Energy News Network
A German bioenergy company is preparing to produce corn ethanol and renewable natural gas at the site of a failed cellulosic ethanol plant in Nevada, Iowa.
Verbio Vereinigte BioEnergie AG is building an anaerobic digester on the site that will annually convert up to 100,000 tons of corn stover — a crop leftover consisting of everything but the kernel — into a renewable fuel that can be fed into the nation’s natural gas pipeline system. Verbio hopes to begin production by fall of 2021.
The biogas, known as RNG, is more expensive to produce than conventional natural gas, but producers can turn a profit by selling credits to refineries and fuel suppliers in California, where a state low-carbon fuel standard requires annual reductions in the carbon intensity of transportation fuels.
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“In a facility we own in Germany, we make ethanol and then turn around and make renewable natural gas,” said Greg Northrup, president and chief executive officer of Verbio North America. “We are just taking what we do in Germany and bringing it here to the U.S.”
Verbio purchased the facility in November 2018 from DuPont Industrial Biosciences, which operated the plant for less than two years. The German company expects initially to produce enough RNG to equal about 7 million gallons of gasoline. That will require between 75,000 and 100,000 tons of corn stover annually, which Northrup said is readily available within 50 miles of the plant. Plans call for expanding that to possibly the equivalent of 20 million gallons of gasoline.
The other side of the operation, corn ethanol production, is likely to begin sometime in 2022, he said, topping out at 10 or 12 million gallons annually. The residue from ethanol production will be added to the corn stover to produce RNG.
Northrup said it will be the first facility in this country to produce both ethanol and RNG, which he expects will be in demand. Oregon also has a low-carbon fuel standard, and other states including Minnesota, New York, and Washington are considering policies similar to California’s.
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