Wind generation is perfectly predictable. It is just volatile. But with enough storage (electrolyze it to hydrogen, then burn it in the gas plants), you can save the generated surplus for days without wind (and solar).

Additionally, new German homes are required, by law, to be build in a way that will not use 1. Gas for Heating 2. a lot of energy at all.

Additionally local energy storage and production in homes is encourgaged with 45% of funding coming from the German state.