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UK Plug-In Solar: Grid Connection, Wiring and Safety Rules

This page is about the United Kingdom’s grid-connection and wiring rules for plug-in solar only. The UK route differs from Germany’s in specific, technical ways — mainly because of how UK homes wire their sockets — and every German reference below is labelled as German so the two are not mixed up.

Before you read on: plug-in solar is not yet lawful to use in the UK. See the current legal status for the full timeline. The regulations that will make the plug-and-socket route lawful — the Plugs and Sockets etc. (Safety) Regulations 1994 and Electricity Safety, Quality and Continuity Regulations 2002 (Amendment) Regulations 2026, SI 2026/848 — were made on 16 July 2026 and are due to commence on 27 August 2026. This page explains what that instrument actually changes, what stays the same, and why the UK could not simply copy the German connection method.

What was actually stopping the plug route, in plain terms

It is not that solar panels on a balcony were illegal. A professionally installed, hardwired small-scale PV system — panels wired into a dedicated circuit at the consumer unit by a competent electrician, notified to your Distribution Network Operator (DNO) — has been a legally available option throughout, just like any other small-scale generator. What has not been legal is the specific convenience the phrase “plug-in solar” promises: buying a kit, plugging its microinverter straight into an ordinary 13A wall socket, and switching it on without an electrician.

The barrier was two linked regulations, not the wiring rules most people assume. The Government’s own consultation document states plainly that plug-in microgeneration products “cannot demonstrate compliance with PSSR and ESQCR and therefore cannot be legally placed on the market or used by consumers.” PSSR is the Plugs and Sockets etc. (Safety) Regulations 1994, and it has long prohibited approving a standard BS 1363 plug — the type in every UK wall socket — for connecting an electricity-generating device to a socket outlet at all. ESQCR is the Electricity Safety, Quality and Continuity Regulations 2002, which sets safety requirements for how generating equipment connects to the network. SI 2026/848 amends both, together, to open a narrow, conditional exception for a new legal category it creates: the “plug-in microgenerator.”

What SI 2026/848 actually defines

According to the instrument itself, a plug-in microgenerator is a device that: generates electricity by converting sunlight; has a maximum rated AC output not exceeding 800 watts; connects to a low-voltage installation via a standard plug and socket; operates in parallel with the electricity network; and cannot import energy for storage, other than for its own control functions. Only devices meeting that definition — and separately certified against the Plug-in Solar Device Interim Product Specification, version 2, published by the Secretary of State on 16 July 2026 — get the benefit of the new PSSR exception. A notified body has to approve the specific plug design for use with a generating device before it can be sold; an uncertified kit plugged into a socket after commencement is exactly as unlawful as it is today.

Two things worth being precise about, because a lot of UK content gets this wrong:

  • The 800 W figure is a rated AC output ceiling measured at the inverter, not a panel wattage limit. As in Germany, it is normal to fit more panel capacity than the inverter can pass, since panels rarely produce their rated output outdoors — the inverter simply clips the peak on the rare occasions the panels would otherwise exceed it.
  • BS 7671 Amendment 4 (2026), published by the IET and BSI on 15 April 2026, is not the instrument that legalises the plug route. Amendment 4 introduced a new chapter on stationary secondary batteries — it is about home battery storage, not plug-in solar. If you see a source claiming Amendment 4 legalised 800 W plug-in solar in April 2026, that source has confused two separate pieces of regulatory work. The wiring regulations remain relevant to a plug-in installation (see below), but the instrument that actually opens the socket route is SI 2026/848.

Why UK sockets needed a different, more cautious answer than Germany’s

The core technical reason the UK could not simply adopt Germany’s approach comes down to how the two countries wire domestic sockets. Most German socket circuits are radial — each socket, or a small group, is wired back to its own protective device. Most UK homes instead use ring final circuits, where a single protective device serves a loop of sockets wired in a ring. Ring circuits were designed around a single point of supply, at the consumer unit, feeding current outward. Injecting current back in at a socket partway round the ring is a different physical situation to the one the circuit’s protective devices were designed for: it can cause uneven current distribution across the two legs of the ring rather than the balanced split a ring assumes, and it can interact with earthing arrangements and RCD behaviour in ways a straightforward radial circuit does not have to contend with. This is the specific, structural reason UK regulators moved more cautiously and more slowly than Germany, rather than any general resistance to the technology.

RCD and earthing protection

BS 7671 (the IET Wiring Regulations) requires additional protection by a residual current device rated at no more than 30 mA for socket outlets intended for general household use — the standard trip threshold designed to interrupt a fault before it can deliver a dangerous shock. That baseline requirement does not change because of SI 2026/848; the new Interim Product Specification and the plug-approval process it feeds are additional conditions layered on top of, not instead of, existing wiring-regulation protections. A plug-in kit’s own microinverter is also expected to carry its own automatic disconnection (anti-islanding) protection, so that it stops feeding current the instant it detects the mains supply has gone down — the same protection built into any grid-tied inverter, so that it cannot electrocute someone working on a “dead” line during a power cut. That also means, as a side effect, that a plug-in system gives you no power during an outage.

DNO notification: G98

Small-scale generators up to and including 16A per phase — roughly 3.68 kW on a single-phase domestic supply, well above the 800 W plug-in ceiling — are covered by Engineering Recommendation G98, published by the Energy Networks Association (ENA). G98 uses a “fit and inform” model: a Type Tested generator (one listed on the ENA’s Type Test Register) can be commissioned first, with the DNO notified within 28 days, rather than requiring prior approval. There is no fee for the notification itself. The Government’s July 2026 consultation response indicates it intends to update G98 to explicitly cover the new plug-in microgenerator category, and separately flagged a preference for limiting installations to one plug-in microgenerator per circuit. Confirm the finalised G98 wording nearer commencement, since the amended text was not yet published at the time of writing.

The plug/socket question, specifically

Before SI 2026/848, BS 1363 — the British Standard covering the plugs and socket-outlets in every UK home — could not be used to certify a plug for connecting a generating device, because the standard’s approval regime assumed plugs only ever draw power, never supply it. SI 2026/848’s amendment to the Plugs and Sockets etc. (Safety) Regulations 1994 creates a route for a notified body to approve a plug specifically built and tested for this reversed use case, conditional on the device meeting the Interim Product Specification. That is a narrower change than it might sound: it does not make every plug generator-safe, or make it acceptable to connect an uncertified device to a normal socket. It creates a specific, tested, approved category of plug for a specific, tested, approved category of device.

UK route vs. German route, side by side

United Kingdom (from 27 August 2026, if commencement holds) Germany (in force since May 2024)
Output ceiling 800 W AC, measured at inverter 800 W AC, measured at inverter
Typical socket wiring Ring final circuits predominate Radial circuits predominate
Plug approval Notified-body approval of a specific plug design against PSSR + Interim Product Specification Standard Schuko plug, no special generator-plug approval regime
Grid operator notification G98 notification to DNO (intent confirmed; amended wording pending) Single-step registration in the Marktstammdatenregister; no separate network-operator notification
Pre-commencement route Hardwired, electrician-fitted, G98-notified dedicated circuit Not applicable — plug route already standard

The output ceiling looks identical because both countries converged on the same practical AC limit; almost everything else in the table differs, because the underlying wiring stock and regulatory starting points differed.

What to actually do before 27 August 2026

Do not connect an uncertified device to a household socket under any circumstances — that is exactly the situation SI 2026/848 is designed to close off by making certification, not just wattage, the gate. If you want a compliant installation now rather than waiting, the only route available is the pre-existing one: a dedicated circuit fitted by a competent, registered electrician, with G98 notification to your DNO — which is a materially different (and pricier) proposition than the plug-in convenience the reform is built to unlock. See the legal status page for how to track commencement itself, and costs and payback for how the installation route affects what you would actually pay.

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