I work for a power company that has one of the strongest and most reliable grids in the country, and if too many car chargers got added in a short time span, our grid would burn down every day. Power companies are having a hard enough time keeping up with the housing boom. The Tesla Supercharger stations that you see here and there are all working on 480 volt 3 phase, and that is the only way to get those POS's to charge at an acceptable time frame.