Recharging should be cheaper per mile at 10 cents/Kw-HR. That’s not the problem. The real problem is the TIME it takes to recharge.
Present fast charging stations are 62.5 kw. The standards are written to allow up to 900 kw in the future.
At 900 kw an average EV would charge in seven minutes.
Correct, and it's not just a practical matter of getting in and out of the recharge station in a reasonably short time, although that is a considerable concern for most people. Life for most of us is already too dang busy to be burning up even 30 minutes for a charge if we are on an extended trip.
However, the other side of it is that fast discharging AND fast charging decreases battery life. Tesla manages (limits) charge and discharge rates already, as well as having coolant run through tubes that contact the individual battery cells to cool (or heat) the batteries as needed. But, 900 KW charging was mentioned upthread -- my goodness. That is from an energy standpoint almost a small explosion in reverse. Offhand, it seems to me elaborate and near complete encapsulation of battery cells in a cooling matrix (bring on the railroad tank cars of heat sink grease!), or perhaps even direct liquid cooling of battery surfaces would be needed. And... then one has to dissipate that heat once it is carried off the cells: A significant task, because the temperature differential to the outside air is not going to be large. (I can see it now: A fast recharge requires both the heavy(!) electrical hookup, plus, hoses to / from the cooling pond.)
As an old engineer friend of mine once said "Anything can be done for enough money".
In Maine the electric rate is already about 20 cents per kwh. That includes the electricity and distribution charges.