If you’re planning to install solar panels or battery storage at your home or business, one essential step is securing approval from your Distribution Network Operator (DNO). This process ensures your system is safely connected to the grid and operates within the network’s capacity.

So what is a DNO application, and why does it matter? Let’s break it down.

What is a DNO and What Do They Do?

The Distribution Network Operator is the company responsible for the electrical infrastructure in your area — including the cables, substations, and equipment that deliver electricity to your property.

If your solar installation will be feeding power back into the grid, the DNO must be notified in advance. They’ll assess whether your system can be safely connected, determine if any upgrades are required, and ensure your setup won’t cause issues such as voltage disturbances or overloading the local network.

Do I Have to Apply Myself?

No need to worry — Solar Suffolk handles the DNO application on your behalf. As part of our turnkey solar service, we take care of the technical submissions and communication with your local DNO, so you don’t have to navigate the red tape.

Depending on your system size and configuration, we’ll determine which application type applies and submit the appropriate request.

Understanding G98, G99, and G100 Applications

There are three main categories of DNO applications used for grid-connected solar systems and battery storage:

• G98 – This applies to small-scale systems under 3.68kW per phase. These can usually be installed right away, with the DNO informed afterwards (within 28 days).
• G99 – Required for systems above 3.68kW, or for battery installations. Approval must be obtained before installation begins.
• G100 – Used when the local network can’t support full export from your system. In such cases, an export limiter may be needed to comply with DNO requirements.

What Is a DNO Confirmation Letter?

Once the DNO approves your system, they’ll issue a formal letter confirming permission to connect to the grid. This document is important for:

• Proving your system complies with network regulations
• Supporting applications for the Smart Export Guarantee (SEG)
• Assisting in the sale of your home (as buyers often request proof of grid connection)

How Do I Find Out Who My DNO Is?

Your DNO depends on your location within the UK. If you’re not sure who yours is, don’t worry — we can check that for you. It’s also usually listed on your electricity bill under “network operator” or a similar heading.

Why Work with Solar Suffolk?

At Solar Suffolk, we aim to make the solar installation process simple and stress-free. The DNO application is just one part of the journey that we fully manage for you — from choosing the right system to handling all regulatory paperwork.

You focus on enjoying the benefits of clean, renewable power — and we’ll handle the details.

✅ Ready to switch to solar in Suffolk? Get in touch with Solar Suffolk for trusted advice, expert installation, and full DNO support.