The UK now spans conventional rooftop PV and a new plug-in solar category
For conventional systems, Smart Export Guarantee tariffs remain supplier-specific, while roof ownership, planning/building context, installer standards and the property’s own load determine the economics. From August 2026, households also gained a new small-system option.
Plug-in solar became legal in Great Britain on 27 August 2026
The UK government announced that plug-in solar panels became legal to buy and use across Great Britain from 27 August 2026. The announcement describes kits producing up to 800W and estimated savings of up to £110 per year under its assumptions. That does not make every balcony, rental or electrical setup automatically suitable, so product instructions and property-specific constraints still matter.
Source: UK Government — plug-in solar announcement.
Use the real export tariff in payback calculations
SEG suppliers choose their own rates and terms. A useful calculation separates electricity used directly in the home, electricity stored for later and electricity exported to the grid.
Continue to London or read the plug-in solar buying and safety guide.