Most DC fast charging rates are about 2x to 3x the local electric rate per kWh, though stations vary quite a bit based on other factors. Here in Colorado, my home power is about $0.125/kWh "normal" rate putting supercharger rates at $0.25 to $0.50/kWh. If I charge my Model 3 Midrange battery (62kWh) capacity from 10 to 80% (typical road trip percentages to minimize charge time) that would be somewhere between $10-15.
95% of the time I'm charging at home and on a net-metering Solar plan, so really only paying those $0.12/kWh rates in the dark winter months, basically charging for "free" off solar once we hit the equinox.
95% of the time I'm charging at home and on a net-metering Solar plan, so really only paying those $0.12/kWh rates in the dark winter months, basically charging for "free" off solar once we hit the equinox.