J.W, average nation wide it cost about 10 cent per kilowatt. Prius is a nice concept, but as of now, they still do not know what to do with all the old batteries soon will be replaced from hybrid vehicles. They will ended up in the landfill and thus hybrid vehicles will have bigger footprint than my Chevy avalanche 1500 which will be almost entirely recycled. My commute vehicle is a Honda Civic with bare minimum options, get close to 40 MPG and alot cheaper than a Prius. Money saving from price different and battery replacement is far out weight the extra MPG.