ENA EREC G99 Type A Fast-Track and Standard Connection Guide

Key Takeaways

• EREC G99 Type A covers Power Generating Modules from greater than 16A per phase up to 50 kW (August 2026).
• Prior formal application and written approval from the DNO is mandatory for all Type A installations (August 2026).
• Standard applications use Form A1-1 with a typical 45 business day DNO review (August 2026).
• Fast-track applications use Form A1-2 for combined solar and battery systems, with an expedited review of 10 to 20 business days (August 2026).

What is ENA EREC G99 Type A and how do you connect to the UK grid?

ENA EREC G99 Type A governs Power Generating Modules with a rated capacity from greater than 16A per phase (or >3.68 kW single-phase / >11.04 kW three-phase) up to 50 kW, connected below 110 kV, to UK public distribution networks (August 2026). Unlike G98, all Type A G99 installations require prior formal application and written approval from the Distribution Network Operator (DNO) before commissioning and energization (August 2026).

The application process involves submitting specific forms to your DNO. The choice of form depends on the nature of your system.

| Type Test Verification Report | A3-1 | Varies | Equipment not on ENA Type Test Register | Figures as of August 2026.

We verified these application requirements and turnaround times by checking the Energy Networks Association's official EREC G99 documentation on 23 August 2026.

What are the technical requirements for G99 Type A systems?

EREC G99 Type A installations must meet specific technical provisions to ensure grid stability and safety. These requirements cover frequency response, loss of mains protection, and power factor control.

| Power Factor Control | Capability to operate between 0.95 lagging and 0.95 leading at full rated active power output | Figures as of August 2026.

These technical specifications ensure that your generating module operates safely and in harmony with the wider grid. Systems exceeding 50 kW fall under different classifications, such as Type B (50 kW to 1 MW), Type C (1 MW to 10 MW), or Type D (>= 50 MW or connected at >= 110 kV) (August 2026). These higher classifications involve more complex application processes and dynamic grid modeling.

How does the DNO approval process work for Type A?

The DNO approval process for Type A systems is mandatory. Unlike smaller G98 installations, you cannot commission a Type A system without prior written consent. This is a critical step to avoid penalties and ensure grid compliance.

1. Application Submission: You submit either Form A1-1 (standard) or Form A1-2 (fast-track) to your local DNO. The fast-track route is available for combined solar and battery systems or non-exporting storage that uses G100 certified export limitation.
2. DNO Review: The DNO reviews your application. Standard applications typically take 45 business days. Fast-track applications are expedited, with a review period of 10 to 20 business days (August 2026).
3. Approval: Upon approval, you receive written consent to proceed with installation and commissioning.
4. Commissioning Confirmation: After the system is installed and commissioned, you must complete and submit Form A2-1 to the DNO within 28 days (August 2026). This form confirms that the installation complies with EREC G99 requirements.
5. Type Test Verification: If your equipment is not already listed on the ENA Type Test Register, you will also need to submit Form A3-1, a Type Test Verification Report.

Understanding the DNO's requirements is crucial. For guidance on larger systems, refer to our ENA G99 Type B commissioning guide.

What are the considerations for solar and storage systems?

Combined solar and battery storage systems can often benefit from the fast-track application route under EREC G99 Type A. This applies specifically if the storage system is non-exporting and uses a G100 certified export limitation scheme (August 2026).

Export-limited systems under G100 must be supported by certified failsafe schemes. These schemes must be tested to respond within 5 seconds (August 2026). This ensures that even if the primary export limitation fails, the system can quickly cease exporting to the grid, maintaining grid stability.

When planning your system, consider the connection point and potential costs. Our guide on commercial solar DNO point of connection budgets provides further insights. For more on export limitation, see our ENA G100 Issue 2 export limitation guide.