Data & methodology

Sources

We base our regulatory, safety and performance content on primary sources, and our calculator on established open data. Here is where the key information comes from.

Regulatory & legal sources

These inform our UK legal-status tracking. Where a precise document link has not been independently verified in this build, it is marked accordingly.

Plug-in solar consultation— Department for Energy Security & Net Zero (DESNZ)Link to be confirmed
Consultation opened 16 June 2026 and closes 30 June 2026. Direct document link to be confirmed.
UK government policy papers and consultations— GOV.UKVerified
BS 7671 Wiring Regulations— Institution of Engineering and Technology (IET)Verified
UK wiring regulations relevant to any electrical connection in the home.
Connecting generation (G98 / G99)— Energy Networks Association (ENA)Verified
Engineering recommendations for connecting small generation to the network.
Smart Export Guarantee (SEG)— OfgemVerified
Scheme under which some suppliers pay for exported electricity.
Microgeneration Certification Scheme— MCSVerified

Last reviewed: 19 June 2026

Calculator data sources

Our generation and savings estimates use these services. See the calculator methodology for how they are combined.

1. PVGIS — Photovoltaic Geographical Information System — European Commission, Joint Research Centre
2. Postcodes.io — UK postcode geocoding — Open data (Ordnance Survey / ONS derived)

How we use sources

We prefer primary sources — official UK regulations and guidance, manufacturer technical documentation, and established datasets — over second-hand summaries. We distinguish confirmed law from proposals and assumptions, and we date our pages so you can judge how current they are. If you spot something that needs correcting, please tell us via the contact page.

Source standards and corrections are overseen by Christopher Panteli, founder and editor of MyPlugInSolar. See our editorial policy for the full approach.