It may not exist at the moment, but the switch to electric (as well as other more efficient vehicles) must be accompanied by an overall reduction in our total per-capita energy consumption. Even if new electric power plants would be built, using the same fossil fuels that now power automobiles, they would be much more efficient and cleaner than millions of individual cars and trucks being driven in stop-and-go traffic. But the ultimate resolution to this problem will involve people changing their lifestyles, using more public transportation, living closer to jobs (or telecommuting), and generally becoming a more cooperative society living and working closely with other people, rather than isolationism, needless competition, and broken families.
Paul