10 alternatives to the gasoline-powered engine

There's no shortage of greener ways to run a car. How viable they are is another story.

2. Plug-in hybrids

fuel chevrolet volt

Plug-in hybrids or PHEVS are similar to gas-electric hybrids but have larger batteries that can propel the car limited distances on electricity alone, thus generating zero emissions. The batteries can then be recharged by being plugged into an electric power source. The cost of the larger batteries carries a hefty price premium -- an additional $7,000 for the plug-in version of the Prius before a recent price cut -- and only four PHEV models are currently available in the U.S. Sales of the best-known model, General Motors' (GM, Fortune 500) range-assisted Chevrolet Volt (above), have been running at less than 2,000 a month.

  @FortuneMagazine - Last updated November 01 2013 08:20 AM ET
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