Demystifying the DNO G99 Application & Fast Track Notification System

Neil Avery
May 23
2 min read

Updated: May 30

Why Installers Shouldn’t Fear the DNO G99 Application Process — Especially With Fast Track

Click here to play our G99 video

For many renewable installers, the DNO G99 application process feels like a major hurdle. Whether you’re installing a larger solar PV system, an advanced heat pump setup, or a combined battery array, once you pass the 16A per phase threshold, you’re no longer in G98 territory — and that’s where G99 comes in.

But here’s the good news: not every G99 application has to be slow and painful. Thanks to the Fast Track Notification System, certain systems can now be processed far more quickly — if you know the right approach.

What Is a G99 Application?

The G99 process is a requirement by the Distribution Network Operator (DNO) for connecting systems that export more than 3.68kW per phase (i.e., larger systems over 11kW three-phase or 3.68kW single-phase).

The application includes:

Full system design
Protection settings and datasheets
Export limitation (if applicable)
Site plan and layout
Evidence of installer competence and grid compliance

What Is the Fast Track G99 Notification Route?

Fast Track is a streamlined version of the full G99 application, intended for systems that meet certain criteria. Typically, these are:

Standard inverter types
No export limitation conflicts
<50kW generation capacity
Use of ENA type-tested equipment

With Fast Track, DNOs can issue approval much faster — often in 15–20 working days, compared to the 45+ days of a full application. At Grid Guru, we’ve helped dozens of installers fast-track their G99s successfully by ensuring all documents are in perfect order before submission.

How Grid Guru Can Help

At Grid Guru, we specialise in taking the stress out of DNO applications, including:

Assessing if your project qualifies for Fast Track
Preparing and submitting all technical documentation
Acting as your liaison with the DNO to speed up approvals

By outsourcing the paperwork to us, installers can focus on the install — while we handle the admin.

Conclusion

The G99 process doesn’t need to delay your project. With the right planning and documentation, Fast Track approval is entirely achievable. Whether you’re unsure which route applies to your system or want a complete G99 application handled from start to finish — we’re here to help.