Power plants are not very efficient at converting fossile fuels to electrical energy. At least 2/3 of the energy created from burning the fuel goes up the stack, out the cooling tower or down the river.
So electric cars overall won't be any more efficient than gas or diesel cars are now.
The most stupid waste of energy is electric heat. If the fuel was burned in the building to be heated, only about 1/3 of the fuel that is burned in a power plant would be needed. This does not apply to geothermal heat pump systems because they get 3 times as much heat from a kilowatt hour than does resistance heating.
P E H