There is no doubt that the Toyota Prius is one of most efficient hybrid cars out there on road. But, when a bunch of geeks decide to use the Prius like a generator to power a house all you can do is just say "Whoa!".

 

Called the PriusUPS, the project is built on a standard Toyota Prius and  costs about US $2,000 - 4,000 in incremental costs apart from the cost of a Prius, if you don't own one.  On the plus side you will get instant on power just like a UPS, automatic load switching, minimal noise and power as long as there is a gas in the tank.