It will happen when we have better weather forecasting models. If it gets randomly cloudy for 5 days this month and 17 days next months screws up planning for factories, farms, datacenters etc.
Batteries, having a mixed grid of renewables, and new advances in nuclear solves this
Across a large enough area it's always sunny somewhere. And clouds don't interfere as much as you'd think. Add in wind, hydro, nuclear and some gas and you can handle pretty much anything just fine.
I always post this https://www.rte-france.com/en/data-publications/eco2mix/powe...