I am somewhat curious what studies have been done to see if the electric grid in each region can handle what percentage of drivers using fast chargers and how m

I am somewhat curious what studies have been done to see if the electric grid in each region can handle what percentage of drivers using fast chargers and how many drivers will be able to charge at home and how many of them are charging off a large solar array whether it be their own or a farm connected to a local substation. I do not know much about the grid capacity in the various regions of the EU. Here in the US our grid is often pushed to the brink causing mandatory shut-offs in some areas.