ENA EREC G98 Micro-Generator Grid Connection Guide: Requirements for Great Britain

Key Takeaways

• EREC G98 applies to micro-generators up to 16A per phase in Great Britain (August 2026).
• Single-phase installations are capped at 3.68 kW, and three-phase at 11.04 kW (August 2026).
• Installers must submit Form B to the DNO within 28 days of commissioning (August 2026).
• All equipment must be Fully Type Tested in accordance with EREC G98 (August 2026).

What is ENA EREC G98 and who does it apply to?

The Energy Networks Association (ENA) Engineering Recommendation G98 (EREC G98) governs the connection of low voltage micro-generators to public Low Voltage networks in Great Britain. EREC G98 applies to Micro-generators with a registered capacity up to and including 16A per phase (August 2026). This means a single-phase maximum capacity of 3.68 kW (16A at 230V) and a three-phase maximum capacity of 11.04 kW (16A per phase at 400V) (August 2026).

Installations that exceed 16A per phase must apply under EREC G99 and obtain Distribution Network Operator (DNO) connection approval before commissioning. For guidance on larger systems, you can consult our guide on ENA G99 Type B Commissioning.

How does the 'Connect and Notify' process work under EREC G98?

For single premises installations where the aggregate capacity is 16A per phase or less, the generator may be connected and commissioned prior to DNO notification (August 2026). This is known as the 'Connect and Notify' process.

The installer or customer must submit a completed Form B (Installation and Commissioning Confirmation) to the relevant DNO within 28 days of commissioning (August 2026). For equipment that is registered on the ENA Type Test Verification Report Register (Form C), only the ENA Product ID reference is required on Form B (August 2026).

However, for multiple premises installations, such as new housing developments, Form A must be submitted for prior DNO approval before connection (August 2026).

What are the technical requirements for EREC G98 compliant equipment?

All equipment used for micro-generator connections under EREC G98 must be Fully Type Tested in accordance with the recommendation (August 2026). Manufacturers lodge compliance on the ENA Type Test Verification Report Register (Form C) (August 2026). Inverters not listed on this register require full Form C submission with third-party test laboratory reports.

Key protection settings mandated by EREC G98 include:

| Under-frequency stage 2 | 47.0 Hz (0.5s) (August 2026) | Figures as of August 2026.

These settings ensure the safe operation and disconnection of micro-generators from the grid when faults or abnormal conditions occur.

How we verified this information

We compiled this guide by directly referencing the Energy Networks Association's official EREC G98 documentation (August 2026). All technical specifications, capacity thresholds, and procedural requirements are sourced from the ENA's published engineering recommendations. We accessed the relevant document on 23 August 2026.

Understanding the scope and limitations of EREC G98

It is crucial to understand that EREC G98 applies specifically to micro-generator connections in Great Britain. While the principles of grid connection are universal, specific regulations, capacity limits, and notification procedures vary significantly by region and country. This guide does not cover grid connection standards applicable in Pakistan or other markets.

If your installation exceeds the 16A per phase limit, you will need to follow the more extensive EREC G99 requirements, which involve prior DNO approval. You may also need to consider export limitation strategies for larger systems or specific DNO requirements. For commercial solar projects, understanding the DNO point of connection budget is also vital.

When planning a solar installation, it is always recommended to use a solar sizing tool to estimate your energy needs and system capacity, then consult with local regulations and your specific DNO for definitive connection requirements.