Unlike other renewable energy sources, biomass can be converted directly into liquid fuels, called "biofuels," to help meet transportation fuel needs
Today, ethanol is made from starches and sugars, but NREL scientists are developing technology to allow it to be made from cellulose and hemicellulose,
First of all, biofuels come in many varieties, but in general, there
are two main products, those that replace (or blend with) gasoline,
and those that replace (or are blended with) middle distillate
fuels, such as diesel fuel, or home heating oil.