The cost would be laughable for the 1.5 kW charger I use with my Smart ED every night, about 5 kWh of total electricity draw, or about $0.70 at nightly rates. Just writing this down blows my mind, this little car is cheap to drive! As for our Tesla, it uses more electricity in vampire draw than my Smart ED does with my 40 km daily commute, so again, about $1.00 per day. Side note : My Smart ED has zero energy usage sitting idle. It's not even measurable. All this to say, free electricity is of very little value compared to the >> $10000 in incentive money!