It's $.26 per kwh.
It's less than $20 to go from low SoC (State of Charge) to 100%, and takes less than an hour in warm weather. However, you should not regularly charge above 90% due to added wear on the batteries.
Best thing to do is to refer you the website link on supercharging. But for everyday use one would want to install a 2nd level charger in your garage. https://www.tesla.com/support/supercharging and https://www.tesla.com/support/home-charging-installation/faq
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