One of the criticisms that you hear against EVs is that the grid couldn't support the power draw required. I am trying to do the math for Ontario - please give me feedback to see if I am correct. There are 6.7 million light vehicles in Ontario so I will use that as the total fleet number. The distance that I have for average distance travelled is 16,000km/yr which is 44km/day. Going 44km in my P85 Model S will use about 11% of the battery or 9.3kWh. The average person could "fill up" in just under an hour with a 240V 40A connection. And this assumes that a Model S is a good proxy for the average vehicle in terms of fuel/power consumption. Multiplying this by 6.7M gives you a daily draw of 62.3GWh. Spread out over 12 hours, assuming that most charging would be done from 7pm-7am gives an average draw of 5GW. The total capacity of the grid is around 20GW but, of course, that can vary as some generation types, like wind and solar are intermittent. But it seems to me that there likely is enough capacity to supply that additional amount of power - as the draw at night is generally well below 15GW but that may not be the case on very hot summer evenings. Currently (10am on Saturday) the demand in Ontario is 12.8GW. One issue might be managing when EVs are charged - it might make sense to have some randomizer or some process of managing which vehicle is charged when as you don't want all of the vehicles charged at once. Some other ways of looking at things. The total energy required in a year to power the fleet by my calculations is 22.7TWh. In the previous few years the total output in Ontario was 137TWh so this would increase overall demand by about 17%. I may be slightly underestimating the power consumption since there would also be vampire losses of a kWh per day or so depending on the vehicle. Any comments on whether my math is correct?