Are they, though? Can you list some bigger storage facilities based on either H or batteries? Like ones that would power a city for few days, for example.
I can’t but it’s also not necessary. There are no conditions were no energy from renewables is produced. You have to cover peaks and shift electricity around a bit. The missing parts are interconnection and, dependend on price, overbuilding.
I can guarantee you that there are conditions when sun and wind aren’t producing a thing or very low output, like during night you are at mercy of wind (hydro is another story, is more stable but even there we experience droughts). So, what do you do when all three (night, no wind and drought) hit you like for a week?
Edit: typo
In the EU, hydrogen. Either by fuel cell or burnt in hydogen ready NG plants. Wouldn’t be my first choice but thats whats gonna happen.
