You are still going to need an energy source that you can “switch on” and balance the grid at times of low wind/solar.

You know it’s not sunny all the time, you don’t need me to tell you that, but it’s not windy all the time either. Batteries are a good investment but they can only hold hours worth of capacity right now not days.

So you have 2 options. Either invest in long term storage, or have enough nuclear around that can kick in when other generators don’t have much, or ideally both, which the UK is doing.

Both Hinkley and Sizewell are the right choice. They’re an upfront cost but once running are cheap.

https://storelectric.com/dunkelflaute-energy-storage/