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The current hybrid vehicles are little more than a clever marketing plan with dubious claims of energy efficiency. I would never buy one of the current vehicles which are overpriced, overly complex, government subsidized machines.
I don't think there would be much difficulty with demand of the nationwide electric grid. These cars don't draw all that much power and it would be during off peak hours anyway. As demand slowly increased, the infrastructure would have time to keep pace.
Don't worry about West Virginia, most of that coal is gone. Wyoming has enough high quality coal to keep us in electric power for the foreseeable future. At least until we can master the science of fusion energy to make power plants that run on sea water and construct a nationwide super-conducting power network.
I would never buy one of the current hybrids, but I would buy a plug-in hybrid as soon as they were available.