> I have no idea how serious these reasons actually are.

Basically, the grid was built with the assumption that plants produce power, and that households only consume it. That means opening a breaker between the transport grid and the distribution lines should allow to safely work on the consumer-bound side.

That assumption no longer works if consumers energize the network, and while I assume workers have safety guidelines to check the line before starting work, there is still a risk.

Fixing this issue would require new remotely-operated breakers to be installed, which is costly, and it's hard to justify installing them proactively just in case.

Similarly the UK requires a "g98" notification for all solar installation, including balcony. But it's just a web form and free.

I have been wondering if there is a smart way to make use of "island" solar at home, but not thought of one other than heating assist (pipe tape heater).