It costs about $0.16 per kilowatt of energy you use in your home. To fully charge the Chevrolet Volt is takes 16 kilowatts. So to charge a Chevrolet Volt it would cost 16 KWH X 0.16= $2.64. With only 8 KWH of charge you can travel up to 40 miles without ever tapping into your gas. Once you start using your gas, which will simultaneously start your generator, the Chevrolet will automatically charge itself. All of the cars energy levels are very easy to keep track of too using the power grid in the car or by accessing it over your cell phone with a new app by OnStar. This car is extremely efficient and is a revolutionary step in the hybrid industry. Kudos to Chevrolet for this one.