I ran the numbers a while back based on real world charging times and range numbers from a Tesla forum for a Tesla S including efficiency losses while charging. In Ontario, it cost about the same money per km to run a Tesla S as our 9 year old Civic… - in the summer time.
Best as I can tell, the range of a Tesla S drops about 20-40 percent from 0 degrees to -20 degrees. At -20 with snow on the roads and commuting in the dark - you get less than half the range you did on a nice summer day.
Electric cars are for urban use where there are charge stations, in locations near the equator, and in jurisdictions that charge less than .10/kwh for electricity.
Anywhere else just get a truck and DOW 