re: “So I guess all the charging stations will be shut down during hot summer days?”
At the moment you are appearing quite fact deficient; By your writing, I can tell you have NEVER seen an electricity demand curve plotted over a 24 hour period.
Come back when you have studied that facet of the electrical system.
Tell me about the range of a fully loaded electric SUV running A/C on a late July Texas afternoon.
California can barely keep their grid up during summer as it is. Do you think things will be fine if they add say 2MM electric cars on the demand side?