"The University of Northern Iowa’s Tallgrass Prairie Center is conducting a five-year project to research how prairie hay can be used to generate electricity, partnering with Cedar Falls Utilities, Soil Tilth Lab at Iowa State University and the Black Hawk County Conservation Board."
"The Tallgrass Prairie Center is a strong advocate of progressive, ecological approaches utilizing native vegetation to provide environmental, economic and aesthetic benefits for the public good. The center is in the vanguard of roadside vegetation management, native Source Identified seed development, and prairie advocacy."
There is another good article on BioPact, "Bioenergy, conservation and wildlife protection can boost each other" that discusses biofuel from native prairie plantings. The article described how native prairie plantings can provide cellulosic biomass for ethanol and other bioenergy methods while simultaneously sequestering carbon in the soil, improving water quality, and providing habitat for grassland birds, other prairie wildlife, and native prairie plant communities.