And back to the plug in cars.
Deployment Miracle Puts Electric Vehicles On Track To Save Livable Climate | ThinkProgress
I saw a Tesla yesterday parked behind a medical facility. Anyway, here is the typical applied experience/economy of scale curve.
One sort of fortunate byproduct of electric cars may turn out to be their used up batteries. The idea is that while their packs may be lacking in the punch you want for galavanting about town, they will serve just fine for the task of storage of reserve power from renewables.