Many people in Florida have expensive backup generators at their homes to handle power outages after hurricanes. I am sure other parts of the U.S. that are prone to recurring natural disasters, such as California, also use backup generators. In strategizing about the next war, U.S. military theorists worry a great deal about the U.S. population's ability to withstand a prolonged power outage. They think we might surrender to get the air conditioning or the television turned back on.
However, we need not fear power outages anymore. Just buy a Prius. Not only do you get a great battery-powered hybrid car, but it is very easy to turn the Prius into a backup generator for about $100. Read this story from LifeHacker to learn how.
We have no idea of all the benefits that will be derived from cleantech.