Where possible, owners are billed per kWh (kilowatt-hour), which is the most fair and simple method. In other areas, we bill for the service per minute. When billing per minute, there are two tiers to account for changes in charging speeds, called “tier 1” and “tier 2”. Tier 1 applies while cars are charging at or below 60 kW and tier 2 applies while cars are charging above 60 kW. Tier 1 is half the cost of tier 2. Tier 1 also applies anytime your vehicle is sharing Supercharger power with another car. Pricing to use a Supercharger may vary by location, and prices may change from time to time. All prices include taxes and fees. Source: Tesla.com Where possible, owners are billed per kWh (kilowatt-hour), which is the most fair and simple method. In other areas, we bill for the service per minute. When billing per minute, there are two tiers to account for changes in charging speeds, called “tier 1” and “tier 2”. Tier 1 applies while cars are charging at or below 60 kW and tier 2 applies while cars are charging above 60 kW. Tier 1 is half the cost of tier 2. Tier 1 also applies anytime your vehicle is sharing Supercharger power with another car. Pricing to use a Supercharger may vary by location, and prices may change from time to time. All prices include taxes and fees. Source: Tesla.com At the time of this article, this is what Tesla has posted for the current average for Supercharging: