G98 and plug-in solar explained

max registered capacity

800 W

per household

1 kit

to notify your DNO

28 days

What does G98 say about plug-in solar?

According to Ofgem’s decision, the amendment:

• Defines a Plug-in Micro-generator and limits it “to a Registered Capacity of 800W or less”. For inverter-based kits, registered capacity is the lower of the inverter rating and the panel rating. In practice that’s the inverter’s AC output.
• Allows one per household. It “limits the connection of Plug-in Micro-generators to one per Customer Installation (effectively one per household)”.
• Requires type testing against G98’s technical requirements.
• Requires notification. It “requires customers to notify their DNO of installation or decommissioning”, with simplified forms.
• Removes some installer steps. Plug-in kits are exempt from “installers’ competencies, provision of a photograph of the cut-out, requirements related to the wiring, labelling and isolation of the plant, and functional checks on loss of mains protection”. Ofgem adds that this does “not remove any requirements for Customer’s Installations … to conform with BS 7671”.
• Keeps storage out. G98 mentions plug-in storage, but Ofgem says “Plug-in Electricity Storage devices will therefore remain prohibited from being sold, supplied, or used in the UK”. See batteries.

Can you have two plug-in kits?

No, not for now. This is the G98 rule most likely to affect you.

• The Interim Product Specification would allow one device per final circuit, but it says G98 takes precedence.
• The Government Response says one per circuit will be allowed only after a matching G98 amendment. Until then, “the current requirement in G98 limiting installations to one device per household will continue to apply”. No date has been given.
• A “household” is a dwelling “with its own electricity supply and consumer unit”. In a block of flats, each flat with its own consumer unit counts separately (IPS §3.3).

Can you add plug-in solar if you have rooftop solar?

Yes, if the total stays within 16A per phase (Ofgem). Above that, the larger connection process (G99) applies. If you’re not sure where your existing system sits, ask the installer who fitted it or a registered electrician.

What does “G98 compliant” mean?

It means the manufacturer has had the device type tested and listed on the ENA Type Test Register as Compliant. A “G98 certificate” usually means the manufacturer’s type-test evidence. You don’t need to get one yourself.

Our device list mirrors the register, showing each kit’s status and when we last checked it.

What do you have to do?

G98 treats you as the installer for a plug-in kit. Your jobs:

• Notify your DNO. The draft says “no later than 28 days (inclusive of the day of commissioning)”. One DNO says before use, so register before you plug in to be safe.
• Use the online route or the paper form. DNOs link to myplugin.solar; the draft also has paper Form B2. You declare that “no more than one Plug-in Micro-generator is connected”.
• Notify removal too, on Form D2 in the draft.
• Fit the warning label. The specification requires kits to come with a label for fixing near your consumer unit (fuse box). It tells anyone working on your electrics that there’s a generator on the circuit.

Step by step: how to register plug-in solar.

Which version of G98 applies?

The plug-in rules are in EREC G98 Issue 2 Amendment 1, made under Distribution Code modification DCRP/MP/26/02. The ENA raised it on 1 April 2026 and consulted from 5 to 30 June 2026. Ofgem approved it on 11 August 2026, and it took effect when the new law (SI 2026/848) came into force on 27 August 2026.

What to do next

Check your kit is Compliant with the compliance checker, then register it with your DNO.