The calculations are pretty complex but that sounds about right. Electric cars move the smokestack somewhere else but don't eliminate it, at least not today. But electric cars can be charged at night which helps to even out the grid so that is good.

I've had a Leaf for a few years now and I think electric cars are great for a bunch of reasons that have nothing to do with pollution or being "green". Almost zero maintenance, charge at home, quiet, simple, no warm up period, lots of torque at low speed, heater and defrost blow hot as soon as you start the car, no exhaust system to rot out, brakes last a long time due to regen braking, used EVs are super cheap to buy, etc.