Last night, Tesla unveiled its Supercharger network of EV charging stations. Tesla’s Superchargers are different primarily because of the amount of current they can dump into a Model S battery pack. Right now they can reach close to 100 kilowatts, and Tesla CEO, ElonMusk said that they should be able to get up to 120KW in the future. That’s over 4.5x time more power than even a Twin Charger. This means that in about half an hour, they could add 150 miles of range to the 85kWh Model S. This means you could leave for a trip in the morning (with a fully charged battery, of course, since EVs are almost always plugged overnight), drive until you feel like taking a bathroom break or get a coffee or whatever, and recharge enough to drive a few more hours.
TL;DR. Drive for Free. Forever. On Sunlight.