Much of the appeal in buying a Tesla vehicle has been the idea that you can recharge your car at one of the many Supercharger stations, free-of-charge instead of spending money on expensive fuel costs. Unfortunately, this perk is subject to change depending on your vehicle's order and delivery date.
The company lead by Elon Musk has announced that anyone who orders a Tesla Model X or Model S after January 1st (with delivery required by April 1st) will have to pay a small fee when they visit a Supercharger station as you would with the upcoming entry-level, Model 3. Each purchase past this date will include 400 kWh of free supercharging credit each year which is equivalent to about 1,000 miles.
As for the exact pricing of this ‘small fee', the details aren't known yet with Tesla stating that prices could fluctuate over time and vary based on the cost of electricity in the region. They did say that this small fee will be less than the expense of a full tank for a gas-powered car.
Keep in mind, this change is only relevant for Supercharger stations which allow to an 80% charge in 40 minutes or a 50% charge in just 20. These Supercharger stations are much more efficient than the older Level 1/2 stations found around the U.S. or performing your vehicle charge from home which will remain free with a significantly longer time to replenish.