There isn't a single study out there which says that plugin/electric cars charged with the dirtiest coal plants available
would put out more CO2 per mile than a conventional car.
PHEV’s and the grid More than enough capacity
If anything they would make the grid even more robust. (In a couple ways listed below)
PHEV and renewables More than enough capacity.
PHEVS in general
http://pluginamerica.org (Not sure if there’s any difference between these two)
http://pluginamerica.com (Not sure if there’s any difference between these two)
Electric versus Hydrogen, (3-4x more efficiency, or 3-4x less power plants, or 3-4x less emissions, your choice on how to look at it)