What about the impact of fast charging on power grids? Where I live there are power outages on hot days because of people running the AC, I can't imagine how it

What about the impact of fast charging on power grids? Where I live there are power outages on hot days because of people running the AC, I can't imagine how it would hold up with a large percentage of houses charging a car. Sure, they could install a secondary battery pack to charge the car and avoid overloading the grid, but batteries would have to be really affordable.