Large scale new tech
IMO we are undertaking a change in mode of transport equivalent to the introduction of ICE with many equivalent issues: capital expense of new tech, comparative underdevelopment of new tech by comparison with existing, unavailability of "fuel" distribution points.
The difference being that this will be a smaller change but effecting larger numbers AND we have a massively enhanced ability to drive both tech and industrial production forward.
While overall power generation is an issue, it can be overstated - it is reasonable to assume that the very greater part of charging will take place overnight. At that time we are ALREADY in danger of having over-capacity from renewables taken with other power sources, leading to a need to load-shed Soaking up over-generation will make our grids more efficient.
While we (UK) ae building 'massive' nuclear power stations (Sizewell C anyway) the technology exists to build Small Modular Reactors which, apparently, take only 5 years to build/commission. Of course this requires political will, which may be in short supply.
I DO think that distribution is a larger issue. If there is to be significant urban uptake then there will need to be a great deal of thought, and investment in infrastructure at a local, even domestic level. I am unaware of this taking place on any scale yet.
The other part of distribution that concerns me is that of the grid itself both above and below ground. While I think that generation issues can be solved through some large scale decisions, the enhancement of the network will be a series of difficult choices - new pylons, large scale buried cables. Essentially we are replacing our existing refineries, storage depots, fleet of tankers and fuel stations with 'something else'. Some can be direct replacements (substations on petrol forecourt sites, power grid running up and down motorways) but much will have to be new.
Again, I am not aware of any of the necessary debate taking place (except very loud objections to a new run of pylons across Suffolk).
I believe we will overcome a lot of this, but there will be many bumps on the road (!)