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> you still affect it by using less, which might cause issues with grid stability

That is weird and IMHO totally wrong. And I'm living in Germany. Anyone here can e.g. create an isolated network, without any permission. The local electricity provider etc doesn't care. All they care however that they remove the counter and the main circuit breaker at their end, to really isolate your house from the rest.

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Maybe I phrased it badly, the scenario I have in mind is this:

you have a house, taking power from the grid. Then you want to become more self-sufficient and add solar, but don't want to sell to the grid, just for yourself. If the solar installation and its circuit is not _fully_ separate from the one connected to the grid you have to get a permit even if it's a "Nulleinspeiseanlage".

Yes, technically you could make everything completely separate, then it would be fine. But I haven't seen that in the wild a single time so far.

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