If you’re planning a solar panel or battery installation, one important step is submitting a DNO (Distribution Network Operator) application. But what exactly does this mean? In this article, we’ll explain what a DNO application is, when it’s needed, and what you can expect.
What is a DNO?
Your Distribution Network Operator (DNO) is the company responsible for maintaining the electricity cables and infrastructure in your area. They manage the safe and reliable delivery of electricity to homes and businesses.
Your DNO needs to be informed when you install a solar system that is connecting to the grid, to ensure your system can export electricity safely. The DNO will apply export limits or carry out upgrades where necessary after assessing whether your local network can accept the additional energy your solar panels will generate.
They’ll also verify that your solar setup meets all technical and safety standards to prevent issues such as voltage spikes or electrical interference.
Who Submits the DNO Application?
At SolarTherm UK, we handle the DNO application for you. We submit the request to your local electricity network operator, asking for permission to connect your solar system to the grid.
Depending on the system size and design, we’ll use one of the following application types:
G98, G99, G100 – What Do They Mean?
- G98 – For smaller systems under 3.68kW. These systems can be installed immediately, and your installer will notify the DNO within 28 days of installation.
- G99 – For systems larger than 3.68kW and battery installations. Permission must be obtained before installation can begin.
- G100 – Used when your local grid cannot accommodate the full export of your system. In this case, the DNO may require an export limitation device to be installed, or for your system to be designed to export less power.
What is a DNO Letter?
Once your application is approved, you’ll receive a DNO confirmation letter. This document proves that your solar system is legally and safely connected to the electricity grid. You’ll need this letter if you:
- Sell your home
- Apply for the Smart Export Guarantee (SEG) to earn money from exporting excess solar energy
How Do I Know Who My DNO Is?
Your DNO depends on where you live in the UK. Each region has its own operator and having installed solar across the UK for over 15 years, SolarTherm UK have dealt with all of the DNOs. If you’re unsure, your installer (that’s us!) can check for you. Alternatively, it’s often listed on your electricity bill.
Final Thoughts
While the DNO application is a crucial step in your solar journey, it’s not something you need to worry about. When you choose SolarTherm UK, we manage the entire process for you — from identifying the right application type to communicating with your DNO and confirming approval.
Let us take care of the red tape so you can enjoy the benefits of clean, renewable energy with total peace of mind.
Ready to go solar?
At SolarTherm UK, we’ll guide you through every step of the way – no pressure, just honest advice tailored to your property, lifestyle, and energy goals.
