> How are these sufficient when Germany still bumps coal, gas and imports in off peak hours?
Because they bump coal, gas and imports in peak hours.
> The question isn't if you can build them, the question is how much storage do you need and the cost. Like how much storage does Germany need for dunkelflauten? Are there any estimations?
I suppose you did not spend a lot of time researching this. That can be easily found by mere googling.
Sorry, I'm quite bad at googling, may you show me what you found regarding this topic? I mean how much energy storage does Germany need to not use fossils and to not import from neighbor states with fossil generation?
Because they bump coal, gas and imports in peak hours.
> The question isn't if you can build them, the question is how much storage do you need and the cost. Like how much storage does Germany need for dunkelflauten? Are there any estimations?
I suppose you did not spend a lot of time researching this. That can be easily found by mere googling.