The grid will adapt. I always like to remind people that we went from no one having A/C to basically everywhere having A/C running all hours of the day in just a couple decades. The power companies enjoy their legal monopolies, so they'll spend just enough to provide what's needed.

As far as transitioning to renewables for power generation. I have my doubts about that ever happening in my lifetime. American politics are too fucked up to make any meaningful progress.