Plug-in solar panels became legal in the UK on 27 August 2026. The change came from a new law, SI 2026/848. A minister at the Department for Energy Security and Net Zero signed it. It sounds simple, but the legal picture has one important wrinkle.
What changed on 27 August 2026?
A new law called SI 2026/848 came into force that day. It was made on 16 July 2026 and laid before Parliament the next day. It lets a plug connect a solar device to a socket, something the old plug rules used to block.
What counts as a "plug-in microgenerator"?
The law gives this a precise meaning. It's a source that makes power straight from sunlight, and tops out at 800 watts AC. It plugs into a normal socket with a standard plug. It works alongside the grid, and doesn't store power for later use. Anything outside that definition isn't covered.
Does the law cover the whole UK the same way?
Not quite, and this is the part people miss. The rule that lets a notified body approve the plug covers England, Wales, Scotland, and Northern Ireland. The rule about installing and running the device only covers England, Wales, and Scotland. That's Great Britain, not Northern Ireland.
What about Northern Ireland?
Northern Ireland's own connection rules, set out separately, are still being worked out. The official spec says its application to Northern Ireland needs more work and may change. If you're in Northern Ireland, hold off until that's settled.
The quick version
- Plug-in solar became legal UK-wide on 27 August 2026.
- The operating rule only covers Great Britain, not Northern Ireland.
- Northern Ireland's own connection rules are still being worked out.