As for missing space, you do have a point. At some point domestic renewable capacities will be exhausted. However, right now Germany imports most of its energy in various forms. Likely we'll keep importing it in the future, just that it will be generated renewably. Changing to renewables AND becoming fully self sufficient would demand too much I think. Not that there are any uranium mines in Germany either.
FTR in 2020, 15% of Germany's primary energy needs came from renewables: https://www.umweltbundesamt.de/sites/default/files/medien/38...
So it's only 85% of the road ahead of us :).
As for missing space, you do have a point. At some point domestic renewable capacities will be exhausted. However, right now Germany imports most of its energy in various forms. Likely we'll keep importing it in the future, just that it will be generated renewably. Changing to renewables AND becoming fully self sufficient would demand too much I think. Not that there are any uranium mines in Germany either.