The residential electric grid was not designed and equipped for the cumulative effects of overnight EV charging in numerous households.  Even with upgrades to the grid in residential areas, other follow-on effects must also be dealt with to maintain grid stability.  I recall when Tesla was first starting, a close friend was just appointed Director of one of the Regional EPA regions.  Her most pressing matter was looking into how EVs were to impact the grid.  She pointed out that many parts of the grid, even in upscale neighborhoods in metropolitan areas, had equipment nearly a hundred years old  

Recently not too far away from the weekend retreat, high tension towers were replaced because they were 90 years old.    Furthermore, when the new commercial district was expanding rapidly twenty years ago, power blackouts happened with a level of regularity.  A couple of times, the above ground lines caught fire.