Plug in solar panels

[ppppenguin]

There is a very serious point to consider.
A proper installation ensures that power is not fed back into the grid when there is work ongoing on the supply line. This is to ensure that we don't kill off the engineers.
Sounds like something that will be banned to me. Smart meters will discount the solar energy gain.

As I said, all inverters used in the UK must be G83 compliant. This means they cannot feed power back to the grid when the mains fails. If your itsy bitsy inverter tries to power the neighbourhood when it shouldn't then it won't get very far. Some PV systems with batteries can run in island mode when the mains fails. This involves some very well designed switching to ensure you can't feed power back to a dead grid connection. There are also earthing implications, especially if you're on PME: https://electrical.theiet.org/wiring-mat...e-systems/

When you have PV, your gains are in two parts:
1: The electricity you don't import. Your meter never sees this.
2: The electricity you sell back to the grid. A smart meter can record this but unless you have an export MPAN there's no way to get paid for it.

If you have a battery then you can also do arbitrage - buy power from the grid at a cheap rate and sell it back at a high rate. Some tariffs are designed to allow this. On a bigger scale some electric cars and tariffs can do this sort of arbitrage. It's called V2G. https://en.wikipedia.org/wiki/Vehicle-to-grid This is potentially a very good way of meeting peak demand without using grid scale storage. It's not here yet but soon will be.