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I'm not sure I buy the fact that we have a lot of electric overcapacity that can be used to charge cars, especially if electric becomes the dominate form of transportation. Because electricity is so much cheaper per mile than gasoline, building solar or wind power plants just to charge cars is the only use that pays for itself without government subsidies. Yes, it could be done a lot cheaper still using power from coal plants, but if the greens want to push renewables, this is their best case.