Thinking About Going Solar? Here's What You Need to Know About SEG Payments and DNO Applications

S C
Aug 8
2 min read

If you’re looking into solar panels for your home or business, you’ve probably come across the terms SEG payments and DNO applications. These aren’t just technical jargon — they’re crucial parts of the process that directly impact your energy savings and legal compliance.

Let’s break it down properly.

What Are SEG Payments?

SEG stands for Smart Export Guarantee. It’s a government-backed scheme that pays you for any unused solar energy you export back to the grid.

Key points:

You must have an MCS-certified system to qualify.
Payments are made by SEG-licensed energy suppliers (not the government directly).
The rate you get depends on the supplier — it’s worth shopping around.
Typical rates range from 1p to 20p per kWh, depending on the supplier and tariff type.

💡 Tip: Choose a supplier with a good export rate — but don’t forget to consider your import tariff too. The trick is to find a balance.

What’s a DNO Application — And Why Should You Care?

Before any solar installation can be commissioned in the UK, your installer needs to apply to the Distribution Network Operator (DNO) — the company that manages the local electricity grid.

There are two types of applications:

1. G98 Notification (most domestic installs)

For systems up to 3.68kW per phase (typically under 4kW single-phase).
It’s a notification, not a request. It can be submitted after the install.

2. G99 Application (anything larger or battery + solar combos)

Required before the installation.
More paperwork. More scrutiny. Usually takes longer (can be weeks or months depending on the DNO’s load).
You’ll need a full system spec, inverter data sheets, and sometimes a witness test.

💡 Important: Batteries can tip the system into G99 territory, even if the solar itself is small — especially if your system allows export from the battery.

What Happens If You Don’t Apply Properly?

You could:

Void your insurance
Be denied SEG payments
Be forced to disconnect the system
Risk grid damage (and face liability)

So yes — this bit matters.

How We Handle It at Electrifusion Solutions

We manage the full DNO process in-house, whether it’s a simple G98 or a complex G99 with storage. We’ll also advise you on the best SEG provider for your setup and handle the necessary documentation to keep everything compliant and profitable.

Final Word

Solar isn’t just about slapping some panels on your roof — it’s about doing it right, so you don’t miss out on payments or land in regulatory hot water. If you’ve got questions about SEG or DNO, give us a shout. We’re not here to hard sell — just to help you make the most of your investment.