100% solar/wind/storage grid is entirely realizable in California using existing technology. It will require major infrastructure and manufacturing investment, unless people think relying on China-based supply chains is still a good idea for something as fundamental as the energy supply.

https://www.nrel.gov/analysis/los-angeles-100-percent-renewa...

Note the reason nuclear isn't being considered is mostly that you'll get more GWH per billion spent on solar/wind/storage than you will per billion spent on any new nuclear facility (which would take at least ten years to build anyway, by most estimates).