 The US government actively supports the development and commercialization of cellulosic ethanol through a variety of mechanisms.In the first decade of the 21st century, a lot of companies announced plans to build commercial cellulosic ethanol plants, but most of those plans eventually fell apart, and many of the small companies went bankrupt.Currently (2016), here are many demonstration plants throughout the country, and handful of commercial-scale plants which are in operation or close to it.