Plug-in solar is now legal to use in Great Britain. SI 2026/848 came into force on 27 August 2026 and Ofgem has approved the G98 connection changes — only kits listed on the ENA Type Test Register may be used, and Northern Ireland is not covered. Read the UK legal status

MyPlugInSolar

Calculator

Plug-in solar savings calculator

Enter your postcode and a few details to estimate monthly generation, how much you'd use at home, and an indicative bill saving.

Your property and system

System size
watts
FlatVertical

Defaults to the Ofgem price cap average for 1 October–31 December 2026. Enter your own rate for a closer estimate.

Defaults to 0. Only set this if you have a confirmed export rate.

Enter your postcode and system details, then estimate to see your monthly generation, self-consumption and indicative savings.

How this is calculated

We estimate generation from your postcode and system details (using Postcodes.io and PVGIS, with an offline regional fallback), then separate that generation from the part that actually reduces your bill. Only the electricity you use as it is generated (self-consumption) saves money; export income defaults to zero. Results are directional estimates for planning, and nothing you enter is stored.

Read the full calculator methodology, including assumptions and limitations.