At this stage you simply can’t produce enough solar and wind powered electricity. Peak energy demands are early evening and early morning as people get ready to go to work or school and come home in the evening.. Peak energy production from wind and solar is mid day. Then solar and wind production are fixed. If weather situations develops requiring heavier demand on electricity you can not increase production. So you have a mismatch and brown outs. Witness California. With nuclear, gas or coal fired units you can simply crank up the system to increase energy out put. Perfect, no, but far more robust than solar or wind. Solar energy requires rare earth minerals. The US doesn’t have a lot so once again we are depending on forgiven sources for our energy.
Oh, I know that. I grew up in California. I’ve experienced the brownouts and blackouts. We are a LONG way from having wind or solar provide any serious amount of energy to power our civilization. I think nuclear is the way to go, but California shut down nuclear power plants like San Onofre, further screwing themselves.