I just checked my Ga Power bill. I have the EV TOU rate giving me very low cost between 11pm and 7am. I calculated that my bill would have been $90 higher if I was on a standard plan. Then just for fun, I fugured out how much juice went into the car, I added 20% for charging loss. So I was able to calculate what my bill would have been without the Model S on the standard rate. Answer: The cost of fueling the Model S was minus $28. That is really cool.