in my book 98.5% easily fits the bill of "close to 100%"
so the answer is exactly what we do today: have a reserve capacity. part of that may even be traditional peaker power plants that remain turned off most of the year just like today.
I'd be curious about climate data on the distribution of Dunkelflaute duration, by region.
I believe the difference is that during a Dunkelflaute, peaker plants might have to generate a large amount of or the majority of electricity, whereas today, peaker plants are build to only generate relatively small amount of power at the margin.
So, we'd have to build a large number of peaker plants, which are really expensive in that they have to amortize their costs over a small amount of uptime.
short term weather forecasts are amazingly accurate. this allows us to deliberately "extend" the "range" of buffer storage. and even today in some situations some energy intense heavy industries have to pause production for a few hours if there is a lack of energy supply.
It's a political problem, not a technical one, and we do not, absolutely not have to build up new parallel peaker capacity. we can simply keep select plants alive.
https://en.m.wikipedia.org/wiki/Dunkelflaute
in my book 98.5% easily fits the bill of "close to 100%"
so the answer is exactly what we do today: have a reserve capacity. part of that may even be traditional peaker power plants that remain turned off most of the year just like today.
I'd be curious about climate data on the distribution of Dunkelflaute duration, by region.