Fleet of Toyota Prius to Power Neighbourhoods?

As we head into the summer season here in South Australia and the potential for more all too frequent blackouts, the hybrid car may have a use as a backup energy supply for your home. Recently, when tropical storms resulted in a power outage in Florida, enterprising hybrid owners plugged the car into the backup uninterruptible power supply in their homes to get the electricity up and running. As long as the car has fuel, it can produce about three kilowatts of continuous power, enough to keep the refrigerator running and the lights on in the average house.

Useful. Gotta keep that beer fridge running. I wonder how efficient that would be as a means of generating power. It also looks a lot easier than this, a peddle powered washing machine.