Tesla managed to create a good coverage of western Europe in 3 years. If there were a complete ban of non-electric cars in 10 years, that should be enough time to make sure there is good coverage of charging stations. Besides, hybrid cars (unfortunately) still can be sold.
It's good coverage along highways. The peak usage of energy might change completely in residential areas if everybody has to charge their car every night for several hours (230 V * 16 A means you will not even refill 20 km/h).
Edit: not sure about the downvotes, anybody care to explain? Did Tesla build superchargers in random 10-20000-inhabitant towns far from highways?
A car in Germany on average only travels 40km/day. Only a fraction of the night is needed to recharge that. Individual cars might have quite different travel distances, but for the grid, the average distance matters.
It's peak usage that is a problem, the average doesn't matter much if everybody charges from 6 PM to 8 PM, does it? Is the grid sized for 50% of the households sucking 3 kW at the same time?
Peak usage also means that uncommon cases are going to be a problem. For long trips I am not sure that the supercharger networks can scale.
When travelling for vacation, for example, planning multiple 30-60 minutes stops at the supercharger station might not be feasible (and the fastest charging only fills the battery by about half of the capacity, so that means more stops) and there's also going to be a problem with waiting times without massive infrastructure improvements. Right now a typical highway gas station has at least 5 pumps and it serves one customer in 3-5 minutes. That is roughly 60000 km-vehicle per hour. To reach a similar capacity, a supercharger station would need (at 30 minutes per 300 km and 150 kW per station) about 15 MW of power and its own high-voltage transformer.
Yet this capacity would be needed only when everybody moves for spring break or summer vacation, and it would be vastly more expensive than a gas station. Is it feasible to have such a thing every 50 km of highway or so?
Peak usage is not a problem. Why should everyone charge from 6 to 8 pm? People will charge when electricity is cheapest. Also there are already discounted rates for heat pumps where the utilities can control the running times to help balancing the net. Actually, electric cars will stabilize the grid by being charged automatically when the grid has a lot of supply and not when there is a shortage.
So if it's cheapest from 6 PM to 6 AM they will start charging (absent any control from the utility) at 6 PM approximately.
I am interested (genuinely :-)) in standards for grid to appliance communication and on which countries have those discounted rates. Would I lose the discount if my commute is longer (so I need a continuous supply throughout most of the night)? Are they tied to specific wires coming in the building?
Also did anybody run the numbers on the power that would be needed by a supercharger network comparable to current highway gas stations?
There are already several standards in place for this. For many decades, the utilities send a signal modulated on the electricity line when cheaper "night" rates are available. This was created to increase the night load as the slow power stations struggled with reducing their power output. There was a special heating system designed to use this, which would heat up over night with cheap electricity and retain that heat for daytime heating. This signal could immediately be used for charging control. And of course the signal would be given only when there is more supply than demand. Certainly not at 6pm. But after 8pm private demand starts dropping strongly (which is mostly generated by cooking).
Smart meters are also already deployed to offer time dependent rates, those could be used for smart charging and for heat pumps there is an active control channel for direct control by the utilities. All that is already in place. Of course this can be done selectively, so if needed, some cars could start charging at 8pm, others at 10pm and so on.
