I think this is the article I was referring to (thanks Kaycei).
Because large quantities of electricity cant be easily stored, power companies have to build enough capacity for the peak load on the hottest day in August. But even on those hottest days, power demand falls sharply at night. Since most electric car owners will probably charge their vehicles overnight, when power is plentiful and rates are lower, the impact on your electric bill will probably be less than the latest video game player youve got in your den.
http://www.msnbc.msn.com/id/28699258/
I might have made too great of a leap and I might be comparing apples with oranges with bananas.
You have demand, consumption, and capacity and then the overall bottom line, the cost. Cost is direct, our pocket book and less direct but equally important, the environment.
This article is real interesting. Compare it with the last paragraph on cars in the above article.