How to Notify Your DNO About Plug-In Solar (G98 Guide)
You must notify your local DNO within 28 days of installing plug-in solar. G98 is the notification process — you install first, then tell your DNO after the fact. The DNO cannot refuse.
- Your inverter must be G98 type-tested — check the ENA register before you submit
- If not, you can do it yourself online in about 20 minutes
- Missing the window can cause complications with insurance, smart meters, or property sale
Download the G98 Compliance Checklist (PDF)
Step-by-step checklist for installing and registering your kit. Includes DNO table and email template.
We'll email you the download link. No spam.
What is G98 and why do I need to do it?
G98 is the Engineering Recommendation from the Energy Networks Association that governs how small generators — including plug-in solar kits — connect to the UK grid. Any generator under 3.68 kW single-phase falls under G98. All 800 W plug-in solar kits qualify.
The notification works like this: you install first, then tell your DNO (Distribution Network Operator) that a small generator is now on their network. You are not asking for permission. You are informing them after the fact.
DNOs manage grid stability. Knowing how many small generators are operating in an area helps them plan for power flows in both directions. G98 notification is a legal requirement — not an optional extra.
The full process at a glance
Total time: about 20 minutes once you have your details gathered.
What you'll need before you start
Most DNO portals take about 20 minutes if you have everything to hand. Gather these six things before you start.
Your MPAN (Meter Point Administration Number)
13-digit number on your electricity bill — see the "How to find your MPAN" section below.
Inverter make, model, and serial number
e.g. Hoymiles HM-800. All three fields are on the label on the inverter body.
Inverter's ENA Type Test reference number
Found on the ENA device database at connect-direct.energynetworks.org — see Section 6 below for how to look it up.
Your DNO's contact details and portal URL
See the DNO table in Section 7 below. Six operators cover Great Britain — one covers your area.
Commissioning date
The exact date you first switched the kit on. Note it down on installation day — your 28-day window starts here.
Energy source code (R/11 for solar)
The G98 form asks you to classify the generation type. For standard plug-in solar: R/11. See the codes table in Section 8 if you have a battery.
How to find your MPAN
Your MPAN is a 13-digit number that uniquely identifies your electricity supply point. It's on your electricity bill — look for "Supply Number" or the large "S" grid symbol. It's also in your energy supplier's app under account or meter details.
Your MPAN will be different — this is an example only. The number has exactly 13 digits.
How to check your inverter is G98 type tested
Before you can submit a G98 notification, your inverter must appear on the ENA's Type Test register. This confirms the device has been safety-tested for UK grid connection. Here's how to check:
Go to the ENA device database
Visit connect-direct.energynetworks.org/device-databases/search-gen — this is the official register of all G98-approved generators.
Search by manufacturer name
Type the manufacturer name — e.g. Hoymiles, EcoFlow, Deye, Anker, APsystems. The search is partial-match so you don't need the full name.
Find your exact model
Match the model number exactly as it appears on your inverter label. Different wattages (HM-600 vs HM-800) are separate entries.
Copy the registered capacity and system reference number
Note the registered AC capacity (e.g. 0.8 kW) and the system reference number. You'll enter both on your G98 form — use the registered capacity, not your panel's DC rating.
If your inverter isn't listed, G98 is not available to you. You would need the G99 route — a significantly heavier prior-approval process. This is why checking the register before buying matters. Return the inverter and buy a type-tested one.
Which DNO covers my area?
Six DNOs cover Great Britain. Find yours below, or use the ENA postcode lookup at energynetworks.org for a definitive result.
| DNO | Covers | Notification portal |
|---|---|---|
| UK Power Networks | London, South East, East of England | ukpowernetworks.co.uk |
| National Grid Electricity Distribution | Midlands, South West, Wales | nationalgrid.com/electricity-distribution |
| Northern Powergrid | North East England, Yorkshire | northernpowergrid.com |
| SP Energy Networks | Central Scotland; Merseyside, Cheshire & North Wales | spenergynetworks.co.uk |
| Electricity North West | Cumbria, Lancashire, Greater Manchester | enwl.co.uk |
| SSEN (SSE Networks) | North of Scotland; Hampshire & Isle of Wight | ssen.co.uk |
How do I fill in the G98 form?
Download a blank G98 form from your DNO's website, or use our template below. Most fields are straightforward — name, address, MPAN, inverter details. Two fields trip people up:
Energy source and technology codes
The form asks you to classify your generation type using a code. Use the table below:
| Your setup | Code | Meaning |
|---|---|---|
| Panels + inverter (no battery) | R/11 | Solar / Photovoltaic |
| Panels + inverter + battery | R/11 + 38 | Solar + Li-ion storage |
| Battery only (no panels) | S/38 | Stored energy / Li-ion |
Getting your phase capacity right
This is your total generation on that phase, not per-inverter. Most UK homes are single-phase — everything goes on Phase 1.
- One 800 W inverter = 0.8 kW
- Two 800 W inverters = 1.6 kW
- One 800 W + one 600 W = 1.4 kW
How do I send my G98 notification to my DNO?
Once your form is filled in, email it to your DNO. Keep it short — they process hundreds of these. Copy the template below, replace the bracketed fields, and attach your completed G98 form.
Subject: G98 Notification — [Your Address, Postcode]
Dear Sir/Madam, Please find attached the G98 commissioning form for a small-scale generation system recently installed at [address, postcode]. The system has been installed and commissioned in accordance with G98 requirements. If you require any further information, please let me know. Kind regards, [Your name] [Your phone number] Attachments: Completed G98 form (PDF or Word)
Attach your completed G98 form as a PDF or Word document. Most DNOs also accept submissions through their online portal — check the links in the DNO table above. You should receive an acknowledgement within 5–10 working days. Save that confirmation email and its reference number.
Frequently asked questions
Is G98 notification the same as getting permission?
What is the difference between G98 and G99?
Do I need to notify if I am a renter?
What happens if I do not notify within 28 days?
What if my inverter isn't on the ENA Type Test Register?
Do I need to include a wiring diagram?
Step-by-step installation and notification checklist with DNO table.
Blank form pre-formatted with all required fields. Fill in and send.
Copy-paste email for submitting your notification to your DNO.