I got interested in this and so went to Google.
Californians drive 306 billion miles per year.
If we want to replace 75% of that with electric cars getting the equivalent of 40 mpg that will take the equivalent of 5.7 billion gallons of gas per year.
A gallon of gas contains 33.4 kW hr of energy. If we assume 75% efficiency in producing electricity that means we need 256 billion KW hr of energy.
Hoover dam produces 4 billion KW hr of energy a year so we need 64 Hoover dams to make this much electricity.
So the goal of moving to electric cars means an astounding increase in electricity production.
Of course, I could be wrong, so check my calculations.
