Comment Sort of (Score 2) 227
Once electric cars become prevalent, the charging time doesn't really matter for the supply and HV distribution side of the grid - each car sucks either 10.2MW for 30s or 10.2kW for a bit over eight hours (30,000s). Once there are enough that the spikes in charging smooth out, the demand increase is the same whichever charging rate you use. The only problem really comes at the edge of the grid, with the connection to individual houses currently being sized about three orders of magnitude wrong for this use. At this point, it's probably not too unreasonable to ask homeowners to pay to have their grid connection upgraded to give them the privilege of a 30-second charge for their car.