Geothermal energy cars
Hydro electric cars
333.79 Natural resources
621.042 Applied physics
Alternative Fuels Data Center -The Alternative Fuels Data Center is a vast collection of information on alternative fuels and the vehicles that use them.
Energy Information Administration -Official Energy Statistics from the U.S. Government.
I Got the Power: Alternative Energy Resources on the Web -Site has information and links to alternative energy resources.
Renewable Resource Data Center (RReDC) -The RReDC is supported by the National Center for Photovoltaics (NCPV) and managed by the Department of Energy's Office of Energy Efficiency and Renewable Energy.