I think you are really underestimating how much progress has been made with renewable energy. Taking a quick look a CAISO, the California grid is currently 65%

I think you are really underestimating how much progress has been made with renewable energy. Taking a quick look a CAISO, the California grid is currently 65% powered by renewables (mostly solar). This is a bit higher than average, but it certainly wouldnt have been nearly as high even 5 years ago, much less 25 years ago.