Currently Electricity, Ethanol, Natural Gas and Propane are available as motor s for light-duty vehicles. Electric vehicles run exclusively on battery power . These vehicles are somewhat constrained in their ability to perform missions but do operate extremely efficiently and cleanly. Nickel metal hydride batteries, although expensive, provide more than a 100-mile range. Manufactured electric vehicles in 1999 include pickups and minivans.
Ethanol is a liquid alcohol that can be made from corn, grains or agricultural waste .
It is renewable and is stored in a liquid form making it very similar to gasoline in its operation. Benefits include its similarity to gasoline for transport, it is a renewable energy, and decreased emissions and greenhouse gas production. Mid-size sedans, compact pickups, and minivans are all available as ethanol vehicles in 1999. Natural gas is a domestically abundant, odorless gas . Natural gas has low levels of carbon and emits lower levels of Greenhouse gases and Ozone then gasoline.