"So, you're thinking of buying one of those gas-electric hybrid cars like the Toyota Prius or Honda Insight. They're trendy, conserve fuel, and reduce pollution. But to really go "green," some entrepreneurs and academics say, you should try a Volkswagen Jetta. Not just any Jetta. A dark blue one that a California electric-car company has modified so that it not only uses electricity but generates it for other purposes. So, once it's parked, you plug it in and sell excess electricity to a utility."
Thanks to Chris Steins