[Big Dave]

Where on earth did you hear power plants are 50% efficient? The best of the gas turbine combined cycle plants are 43% efficient. To get 50% you'd need a Carnot engine - which nobody has ever figured out how to make. Most simple Rankine-cycle plant are about 37% efficient.

Transmission efficencies decrease with distance, but generally vary between 15% and 40%.

Here in Indiana, an electric car is a coal-fueled car as our electricity portfolio is 98% coal.

If you believe the Global Warming thing you must offer people a workable alternative and right now the only workable large-scale zero carbon alternative is nuclear. If you believe in the Global Warming thing the only feasible response is to build and commission thirty new nukes each year for the next forty years.