It costs $7 to charge a Model S base model with US average rate electricity ($0.12/kilowatt hour). The battery on these is much less than a kilowatt hour. The

It costs $7 to charge a Model S base model with US average rate electricity ($0.12/kilowatt hour). The battery on these is much less than a kilowatt hour. The battery and equipment are going to be much more expensive, but I believe they can probably get it to be cheaper than a human delivery person.