Tesla recently started opening its Supercharger network to outside EV brands, but the influx of more vehicles to charge has put a strain on the system. To help with the surge, the automaker has started charging congestion fees of up to $1 per minute at busy Supercharger locations. The fee is intended to get drivers in and out of the charging stations faster by making it more expensive to charge to 100 percent. Some Superchargers already charge an idle fee that discourages leaving a fully- or almost fully-charged vehicle plugged in for too long, and the new congestion fee starts once a vehicle has reached 90 percent.