So it's built into the price of the Model S and TANSTAAFL and all that. The point being that you don't do a transaction at the supercharger station in the same way you do at a gas station. Theoretically, you could use a supercharger station multiple times a day and pay nothing additional.

It's like the "free maintenance" on BMWs. Or "free loaner cars" when your car is in for service.

Seems pretty nitpicky to point out that it's not in fact free. Whatever it is, it's quite a bit different than chucking some dollars at Chevron or whomever.

No, but using the Tesla Supercharger stations is free for Model S owners.

Charging electric cars is free at the stations where Elon Musk is using solar canopies:

http://www.teslamotors.com/supercharger

Charging comes at no additional cost.