http://thefraserdomain.typepad.com/energy/2006/09/prius_phev_will.html#comment-22722444

It looks like the first dawning of the technology to store renewable energy from wind, water, and solar power in the batteries of electric plugin cars plugged into the power grid.

I mentioned this in another article here awhile back. 

http://amazngdrx.blogharbor.com/blog/_archives/2005/7/10/1012526.html

100s of millions of electric cars plugged in while sitting still (95% of a car's life is parked) at home, at work, at school or shopping.  Storing power, days worth of power to even out solar and wind power peaks and valleys.

Then one can charge the car full up in a few minutes when needed, either by programming the charger in the electric car, say for the time one leaves for work, or simply waiting 5 minutes to get it back to full charge anytime it is need for commuting.

Car owners that plugin to help the grid smooth its peaks would be rewared with lower cost killowatts for their car and home.  Depending upon how many storage killowatts their car provided to the grid.  all simple with computerized electronic metering and billing.

Actually this makes it worth having battery storage in one's home too.  Storing power for the power company and reducing your energy costs.  And it fits right in with home solar, wind, and even farm biogas fuel cell/microturbine  electric power generation (75% efficiency electric power from cow poop!).

The value of your killowatt hours gleaned from your own renewable energy system can be maximized by getting payed to help the power company smooth out peak demand and renwable energy supply.