UK Plug-In Solar 2026: What EPCs Should Tell Clients

Quick Answer

Why This Matters for EPCs

Your residential clients are going to hear "plug-in solar is now legal" in the news this week, and most of what they read will oversimplify it into "walk into a shop, plug it in, done." That's not accurate right now, and being the installer who can correctly explain why is a real opportunity, not a threat to route around. The practical install route today is still professional work, a hardwired connection with proper G98 notification, done by someone who can also actually assess whether a client's home wiring is in a fit state to take it, which nothing in the new framework requires anyone to check.

What Actually Changes on August 27

SI 2026/848 amends the Plugs and Sockets etc. (Safety) Regulations 1994 and the Electricity Safety, Quality and Continuity Regulations 2002, formally defining a "plug-in microgenerator" and requiring compliance with the Interim Product Specification. The cap is 800W of inverter output (800VA, 3.5A) per kit, with total panel capacity allowed up to 2,000W across a maximum of four panels. The kit, panels, inverter, cables, plug, and mounting, must be certified as a single package, a UKCA mark on the inverter alone doesn't satisfy it. Extension leads and adaptors are prohibited, the kit must connect to a suitable socket circuit directly.

The Gap Between "Legal" and Usable

This is the part most coverage is missing. A standard UK 13A wall socket is designed as an outlet, built to supply power, not receive it. The certified plug component that would let a compliant kit actually connect through an ordinary wall socket hasn't cleared testing yet. As of this writing, retailers selling "compliant" kits are shipping them with a certified microinverter but without a certified plug, because none exist.

That means the only route that's actually compliant and usable right now is the one that predates this whole law change: a hardwired connection to the consumer unit, made by a CPS-registered electrician, with G98 notification submitted to the DNO before the system is energized. The legal change hasn't replaced professional installation yet, in practice it currently requires it, just for a smaller, cheaper category of system than before.

What G98 Notification Actually Requires

The Safety Question Nobody's Fully Answering

DESNZ's own commissioned independent safety study found that plug-in solar can be safe on UK domestic wiring, provided minimum product standards are met. That finding is genuinely reassuring about the product itself, and it's one both supporters and critics of the rollout accept. But it addresses the product, not the property. Nothing in the framework requires checking the actual condition of the specific home's wiring a kit gets plugged into, and this is exactly what the joint statement from ECA, Electrical Safety First, the IET, NICEIC, and SELECT flagged in June: older properties with degraded wiring carry real risk that a compliant product alone doesn't solve. Worth being precise about the timing here, that statement was published a week before the draft specification and five weeks before the final one, so it's worth reading as a concern about the rollout generally rather than a direct critique of the final spec's actual content.

This is a genuine, current gap, and it's exactly the kind of judgment a homeowner plugging in a box from a shelf can't make for themselves, but a qualified installer assessing a specific property can.

What EPC Teams Should Do Now

Common Mistakes to Avoid

• Assuming this applies UK-wide. SI 2026/848 covers England, Wales, and Scotland. Northern Ireland isn't included.
• Citing the June 9 joint industry safety statement as a critique of the final rules. It was published a week before the draft specification and five weeks before the final one, it's an early rollout concern, not a review of what was actually finalized.
• Treating the UK framework as equivalent to Germany's Steckersolar rules. The UK cap is lower, 800W against Germany's higher ceiling, and the UK version is brand new, without Germany's multi-year track record or an established certified-plug ecosystem.
• Assuming any product under the 800W/2,000W caps is automatically compliant. The rules require whole-kit certification, panels, inverter, cables, plug, and mounting together. A UKCA mark on the inverter alone doesn't satisfy it.
• Assuming an extension lead or adaptor is fine with an otherwise-certified kit. Both are explicitly prohibited, the kit has to connect directly to a suitable socket circuit.

Where Reslink Fits This Conversation

A client asking about plug-in solar is usually comparing it against nothing, they haven't seen what a properly sized small residential system actually looks like or costs. Having that comparison ready inside the same conversation, real panel layout, generation estimate, and savings figure for the property in question, rather than a follow-up call days later, is often the difference between converting the lead and losing it to a £400 kit that turns out to need an electrician anyway. Reslink's design and proposal workflow is built for that speed at the smaller end of the residential range this framework touches, pull the property, generate a sized system and savings comparison, and have a real, bank-ready proposal ready before the client finishes reading the next plug-in solar article. If this is a conversation your team is starting to have more often, worth seeing how fast that comparison can actually be put together.

See how lead tracking and proposal delivery work together on one platform → Book a demo

Frequently Asked Questions

Q1. Does this apply the same way to flats and multi-unit buildings as it does to houses?

Not entirely. The joint statement from ECA, Electrical Safety First, the IET, NICEIC, and SELECT specifically flagged that if multiple flats in a single block each install a plug-in kit independently, the cumulative effect on the local network could be significant in a way a single detached house wouldn't produce. Nothing in SI 2026/848 requires building-wide coordination, worth checking directly with the DNO for any multi-unit property before quoting.

Q2. Does a client need planning permission or listed building consent?

That's not covered by SI 2026/848 itself, which addresses electrical safety and connection rules, not planning law. Existing UK planning rules for solar installations, including any listed building or conservation area restrictions, still apply separately and should be checked per property.

Q3. Is there official consumer guidance yet on things like circuit identification and when to call an electrician?

Not as of the specification's publication. DESNZ had promised consumer guidance covering circuit identification, mounting, prohibited uses, and when to call an electrician ahead of the August 27 start date, but it wasn't published alongside the final Interim Product Specification. In practice, there's currently no official self-help resource to point a client toward, another reason the professional route remains the practical one right now.

Q4. Will the network registration process get simpler than standard G98 in future?

Reportedly, yes, eventually. A simplified registration process intended to replace the standard DNO application for these smaller systems has been reported as in development, but it wasn't ready as of the most recent reporting. Today's route is the standard G98 notification process, not a streamlined consumer version, worth setting that expectation rather than assuming a simpler process is already live.

Q5. How is this different from Germany's Steckersolar rules that plug-in solar is often compared to?

Germany's balcony solar framework allows a higher power ceiling and has an established multi-year track record with millions of installed units. The UK's version is new, capped lower at 800W inverter output, and as of the August 27 start date, still lacks a certified plug component for genuine wall-socket installation, a gap Germany's more mature framework doesn't have.

Sources

• UK Government (Primary): gov.uk, Plug-in solar regulatory amendment and Interim Product Specification, confirms SI 2026/848 made July 16, 2026, in force August 27, 2026, and the 800W/2,000W technical caps
• ECA, Electrical Safety First, IET, NICEIC, and SELECT (Primary): eca.co.uk / niceic.com, joint statement, June 9, 2026, confirms the five-body safety warning and its call for standards before mass-market rollout
• Plug Solar Hub: plugsolarhub.co.uk, confirms UK 13A sockets are outlets rather than inlets, and that the hardwired, electrician-installed route remains the only currently compliant and usable path
• Balcony Solar Guide UK: balconysolarguide.co.uk, confirms the DESNZ safety study's product-versus-property distinction and the timing gap between the joint statement and the final specification
• 4 Billion Years On: 4billionyearson.org, confirms G98 notification mechanics, a post-installation process within 28 days that the DNO cannot refuse
• UKEM Group: ukem.co.uk, confirms the whole-kit certification requirement and the prohibition on extension leads or adaptors