No idea but the volt even has the ability to schedule the charges based on the cheapest off peak hours. --- Post Update --- Hey bud. In all honesty the car is designed for those who drive less than 50 miles per day to maximize efficiency. I've driven over 600 miles and I've used less than 1.3 gallons of fuel. If you are traveling long distances the cost effectiveness certainly dwindles since the combustion engine yields about 42 MPGs. City drivers will see the largest benefit. Charging is super easy. The charger plugs into a normal 120v socket, and you can run extension cords to your car if need be. The actual charging end that plugs into the car is (humorously) shaped like a gas nozzle. Simply plug the sucker in and 10 hours later you are at full charge. If need be, you can buy the 240v adapter if your house is equipped to for that and get a full charge in less than 4 hours.