Explaining G98 and G99
G98 and G99 specifically refer to different kinds of protection settings regulations that generation or storage assets must comply with in order to connect to the network. The protection settings are an important fail-safe mechanism that protect both the network and the asset from potential faults.
WHAT’S THE DIFFERENCE BETWEEN G98 AND G99?
If you are connecting single or multiple phase generators at a single premises of up to 16A (3.68kW) per phase, you will need to complete a G98 notification form.
If you are connecting single or multiple phase generators at multiple premises of up to 16A (3.68kW) per phase, you need to complete a G98 application form before you can connect.
If you are connecting large scale generation, above 16A (3.68kW) per phase or energy storage, then you will need to complete a G99 form.
We have a helpful decision-making tool that can help you determine whether you need to make a G98 or G99 application.
G98 IN FOCUS
You need to submit a G98 application if you are applying to connect a generation up to 16A (3.68kW). Depending on the nature of your project, you will be required to complete different forms.
If you are installing micro-generation at a single premises, you can carry out the installation but must notify us within 28 days of commissioning. The same criteria applies if you are connecting micro-generation at multiple premises that are more than 500 meters apart. You can notify us online or complete a G98 single premises application form and return it to us by email or post.
If you are installing micro-generation at multiple premises that are in close geographic proximity, on the same street for example, then you must make an application to us before you can connect. You can apply online or submit a G98 multiple premises form.
G99 IN FOCUS
You will need to submit a G99 application if you are applying to connect a generation asset that’s over 16A (3.68kW) or connecting energy storage. Depending on the nature of your project you will need to complete different application forms.
If you are connecting generation or battery storage to our network, you should complete the relevant G99 application form.