G99 compliance: what developers need to know

For DNO connections for generation projects or demand with generation behind the meter

Recorded 22 April 2026

Most developers focus hard on securing their grid connection. Compliance tends to get less attention.

That’s where problems start.

G99 compliance gaps rarely surface early. Changes get made to existing sites without the right notifications. Submissions get handed off inappropriately. G99, P28 and G5/5 studies get done too late to order the harmonic filter or other mitigation equipment that you now need. And by the time something goes wrong, the project is constructed and facing expensive and lengthy energisation delays.

But experienced developers do handle this well — and there’s a clear process behind it.

This webinar is for developers navigating compliance for a new DNO connection, and for those managing existing assets where modifications are on the horizon. In this recording, Catherine Cleary, Philip Bale, and Nikki Pillinger cut through the jargon, explain what the process actually involves, and draw on real examples of what good compliance looks like in practice.

Topics include:

• the standard G99 compliance process for new DNO connections – including demystifying the acronyms
• what counts as a material change to an existing site, and what that means for your obligations
• how to choose the right compliance support for your project – dividing responsibilities between ICPs, EPCs and consultants.

We will use and protect your data as stated in our Privacy Policy