"If you have four hour battery storage, that can get you though a dunkelflaute".
A dunkelflaute is a high pressure system combined with an inversion which can stagnate over northern Europe for a week or more. They are fairly common in the winter. Combinations of dunkelflauten can occur in away that does not allow you sufficient time to recharge renewable based storage.
For a zero fossil,zero nuke German grid, the storage required for reasonably reliable power is more like 20 days. See
Nicely done.
"If you have four hour battery storage, that can get you though a dunkelflaute".
A dunkelflaute is a high pressure system combined with an inversion which can stagnate over northern Europe for a week or more. They are fairly common in the winter. Combinations of dunkelflauten can occur in away that does not allow you sufficient time to recharge renewable based storage.
For a zero fossil,zero nuke German grid, the storage required for reasonably reliable power is more like 20 days. See
https://jackdevanney.substack.com/p/nuclear-and-windsolar
Others such as Ruhnau and Qvist come up with similar numbers
https://iopscience.iop.org/article/10.1088/1748-9326/ac4dc8
Thanks Jack. The book is just chock full of whoppers like this.