Date: 1st February 2024

Navigating the Grid: Demystifying G98 and G99 for Your Solar Power Journey

Navigating the Grid: Demystifying G98 and G99 for Your Solar Power Journey

Congratulations on taking the exciting step towards a solar-powered future! As you navigate the installation process, you might encounter terms like G98 and G99. Don't worry, we're here to break down what these seemingly cryptic codes mean and guide you smoothly through this essential step.

G98: This form applies to most domestic solar installations generating up to 3.68kW. Think of it as a simple "connect and notify" process. You'll provide basic information about your system and a signed declaration, and that's it! No complex technical details.

G99: This form comes into play for larger installations exceeding 3.68kW, typically seen in commercial setups and some bigger homes. It's more involved, requiring technical specifications, site plans, agreements, and a connection design from your installer.

So, which one is right for you?

  • For most homes: G98 is likely your path.
  • For larger installations: G99 is required.


  • Consult your DNO and installer: They'll confirm the right form and guide you through the process.
  • Compliance is crucial: Avoid delays or disconnection by following G98/G99 regulations.
  • Seek professional help for G99: Navigating its complexity can be easier with expert guidance.

At Wil-lec Group, we're solar installation experts. We handle all the G98/G99 complexities for you, ensuring a smooth and hassle-free transition to solar power. Contact us today for a free consultation and let's embark on your sustainable energy journey together!

To start your solar panel journey get in touch here or call us on 01472 241881

Gary Stafford Business Development Manager