aRounded to one digit, 2007 USD.
bBiomass can be co-fired with coal in quantities up to about 20%.
cRanges based on use of the fuel in a representative group of vehicles. Grid-electric cars are usually smaller than fleet average cars, so their better performance per vehicle mile traveled (VMT) is also dependent on use of smaller cars with lesser driving ranges.
dFuture additions to supplies may include imported liquified natural gas, which will include nonclimate damages outside the United States at the source and will have increased climate damages in the range of 30% or more depending on the gas field and the liquefaction plant details.
ABBREVIATIONS: CNG = compressed natural gas; HEV = hybrid electric vehicle: EV = electric vehicle; MCF = thousand cubic feet.