Solar works OK 4-7 hours per day, in the right climate and latitude bands. But it costs more to store and retrieve a kWh of electricity from a battery than it does to generate it from natural gas, nuclear, or hydro. So you need 100% backup or vast quantities of wind and vast capability to transfer wind power across continents or vast quantities of expensive batteries (you will always need 100% backup)
As of right now, 06:35 local time, CA is getting less than 23% of its grid power from renewables. Yet this summer, there were many hours each day when renewables supplied well over 50%. Which means if renewables are more than doubled, then there will be many hours where capacity will have to be severely curtailed, and the fossil fuel "backups" will be forced to chase even steeper demand curves. This is when the grid breaks.
Solar works OK 4-7 hours per day, in the right climate and latitude bands. But it costs more to store and retrieve a kWh of electricity from a battery than it does to generate it from natural gas, nuclear, or hydro. So you need 100% backup or vast quantities of wind and vast capability to transfer wind power across continents or vast quantities of expensive batteries (you will always need 100% backup)
As of right now, 06:35 local time, CA is getting less than 23% of its grid power from renewables.