Most cellulosic ethanol today is made from crop residue as corn stover and wheat stalks are easily coprocessed at current corn ethanol plant locations. Switchgrass is out of the commercial picture, but continues to be a topic of scientific research. Even that, however, may start to subside.Switchgrass was once considered the best thing since sliced bread back in the day when the Renewable Fuel Standard (RFS) was nothing but a promise. In 2008, nearly a dozen companies were pursuing switchgrass as a feedstock to produce cellulosic ethanol, an advanced form of ethanol under the RFS that had its own very aggressive mandate. Now six years later with the RFS at the blend wall and other technologies moving forward, switchgrass is quickly becoming...