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well, here it's simple - 2 plates, 1 converter and the plug from the converter simply goes into my socket on the outside of the wall. ezy peazy

Do you have a post with more details? There's a few people posting about solar and it's interesting to see what the options are. Someone in the UK was saying they would like solar, but they are in a rented house. Plug-in could work, but may not be legal.

3 - I'm also considering adding more, but the electricity storage units aren't exactly cheap and don't give me much of an advantage at the moment, as I use all my electricity directly :D

We have a big battery and that saves us money as we can charge it on cheap rate and hardly use the expensive power. Not getting massive solar right now.

Maybe Wind-Energy is also interesting? Like a Turbine on top of the House?

Small turbines don't generate a lot and a big one would have issues.

I don't know why it should be illegal to operate a solar system or balcony power plant in the UK - but here in Germany, at least the installed system must be registered online with 2 different authorities

I think it's down to safety concerns. The plug from the panels could have live pins and that supply is bypassing the breakers. Our electrical regulations are pretty strict. Our panels have their own breakers in an extra box.

4 - Perhaps the UK needs to slowly realize that solar energy is good and make legal adjustments in this regard.

There is a fair bit of rooftop solar here, but we may have more homeowners who see it as an investment. Some new houses have it pre-installed, but sometimes they just have a couple of panels that won't do too much.

2 - in advance - or it must be reported that there is now a balcony power plant at this address and that it may be feeding electricity into the grid. Furthermore, my grid operator installed a new, more modern electricity meter a few weeks ago.