I have been just doing some research about this for another discussion. Here's some article quotes: From https://www.vox.com/energy-and-environment/2017/4/7/15

I have been just doing some research about this for another discussion. Here's some article quotes: From https://www.vox.com/energy-and-environment/2017/4/7/15159034/100-renewable-energy-studies https://www.vox.com/energy-and-environment/2017/4/7/15159034...: "The professional energy community used to be quite convinced that wind and solar could play no serious role in the power system because of their variability. Then, for a long time, conventional wisdom was that they could provide no more than 20 percent of power before the grid started falling apart. That number has kept creeping up. Now CW has it around 60 percent. Which direction do you suppose it will go in the next few decades? It’s a similar story with batteries and EVs. They keep outpacing forecasts, getting cheaper and better, finding new applications. Is there any reason to think that won’t continue?" From https://www.vox.com/energy-and-environment/2020/3/28/21195056/renewable-energy-100-percent-clean-electricity-power-to-gas-methane https://www.vox.com/energy-and-environment/2020/3/28/2119505...: "To some extent, sun, wind, and water balance one another out; where it is not sunny, it is often windy. With a good national transmission system, renewables could supply up to 60 percent, maybe 80 percent of electricity in the US, but after that, things get expensive and something else is needed to fill the gaps." So here you go, we could go 60-80% renewable today, and worry about the rest when we get there. Most likely these problems are going to be solved, or the (non-intermittent) energy will simply be more expensive.