Glossary
G98
The GB network rules for connecting small generators, including plug-in solar kits, in parallel with the local electricity network.
Engineering Recommendation G98 (EREC G98) is the industry rulebook for connecting small generators, up to 16 A per phase, to the electricity network in Great Britain. It covers how the equipment is type-tested and how the local network operator is told about it.
G98 Issue 2 Amendment 1 added a “Plug-in Micro-generator” category: a generator with a registered capacity of 800 W or less, fitted with a standard plug. Ofgem approved the change on 11 August 2026, and it took effect with the plug-in solar law on 27 August 2026 (Ofgem decision).
For plug-in solar, G98 matters in three ways:
- One device per household. G98 allows one plug-in micro-generator per customer installation. The DESNZ product specification would allow one per circuit, but G98 takes precedence until it is amended (Ofgem; government response).
- You must notify your DNO when you install or remove a kit, within 28 days of installation (impact assessment).
- Kits must be type-tested to G98 and listed as Compliant on the ENA Type Test Register (IPS §7).
In practice: register your kit before you plug it in, or within 28 days of doing so.