Free unlimited supercharging
Some Model S sedans and Model X SUV’s come with free unlimited access to Tesla’s Supercharger network (both new and used vehicles). This makes charging free.
Check your Tesla account for more information.
Note: although these cars are free to use Superchargers, charging at home will not be free (unless you produce your own energy via solar panels).
Tesla’s without unlimited supercharging will have to pay a fee when they use a Supercharger.
At the time of writing, you pay $0.28 per kWh in the U.S.A. Prices depend on your location and may change over time.