This is the future, a vast fleet of mobile batteries that smooth out the grid enabling renewables that only work when the sun shines or the air moves to supply all the electricity we need.
People also overlook the costs of refining petrol and getting it distributed preferring to stress out about how on earth are we going to charge every car. This latter point is quite simple albeit requiring infrastructure. Lamp-posts are charging points in the making as are car parks. We dug up the roads to put in broadband internet quite recently, it is for the politicians to rig the market for EV cars and charge points so that there is a similar roll out.