BSI Plug-In Solar Standard — UK 2026 Tracker
An independent tracker of the UK BSI plug-in solar product standard expected July 2026, BS 7671 Amendment 4 (April 2026), and BS 1363 — plus what each one actually authorises for buyers, renters, and installers.
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See Your Postcode Savings →Key takeaways
- The BSI plug-in solar product standard, expected July 2026, is a product specification. It will let manufacturers certify that a kit meets a defined UK safety spec.
- The BSI standard does not by itself amend BS 1363 (UK plugs and sockets) or BS 7671 (wiring regulations). DIY 13A-plug installation is not automatically authorised the day the BSI standard lands.
- BS 7671:2018 + Amendment 4:2026 (published 15 April 2026) governs UK wiring installations. It does not authorise plugging small generating equipment into a 13A socket outlet.
- The compliant 2026 route in the UK is a CPS-registered electrician with a hardwired connection to the consumer unit (£250–£450). Savings are identical either way.
- At 800W, plug-in solar sits well under the G98 threshold of 3.68 kW — meaning fit-and-notify within 28 days, no prior DNO approval required.
What the BSI plug-in solar standard actually is
The BSI plug-in solar product standard is a product safety specification. When it publishes (target: July 2026), it will give UK manufacturers and importers a defined benchmark to certify their kits against. Think of it as the kitemark for an 800W microinverter-and-panel set sold in the UK.
What it does:
- Defines minimum safety requirements for a UK plug-in solar kit (panels, microinverter, cabling, connectors).
- Allows certified kits to carry a recognised UK conformity mark.
- Gives insurers, retailers, and DNOs a single technical reference to work from.
What it does not do — and this is where most explainers go wrong:
- It does not amend BS 1363, the standard covering UK 13A plugs and sockets. BS 1363 designs sockets as power outlets, not as inlets for externally generated AC.
- It does not amend BS 7671, the IET Wiring Regulations, which still do not authorise plugging small power-generating equipment into a 13A socket outlet.
- It does not create a legal right to DIY-install via a wall plug.
For the difference between BS 7671 and the BSI product standard in detail, see our BS 7671 plug-in solar explainer.
UK plug-in solar regulation timeline
DESNZ signal
The Department for Energy Security and Net Zero (DESNZ) signals public support for plug-in solar as part of the UK's home energy resilience strategy.
BS 7671 Amendment 4:2026 published
The IET Wiring Regulations are updated. Amendment 4 does not authorise plugging power-generating equipment into a 13A socket — the existing position is reaffirmed.
BSI plug-in solar product standard
Publication target for the BSI product safety specification. Kits certified against it can carry a recognised UK mark. Does not amend BS 1363 or BS 7671.
BS 1363 + BS 7671 review
For DIY 13A-plug installation to become compliant, BS 1363 and BS 7671 would also need amending. As of May 2026 there is no published timeline for either.
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800W kit, your postcode, your hours-at-home — out the other side: an honest payback figure.
Calculate Your Plug-In Solar Savings →What this means for buyers, renters, and homeowners
If you buy now (May–June 2026)
You can buy a UK-stocked EcoFlow STREAM 800W kit on Amazon UK for around £499. The compliant route in 2026 is installation by a CPS-registered electrician with a hardwired connection to your consumer unit, total £750–£950. You start saving £100–£180/year immediately. See our best 800W kits guide for current options.
If you wait for July 2026
You may see certified kits carrying a BSI mark. The kit itself will be similar; the difference is the conformity certification. The installation route in the UK will still be a CPS-registered electrician with a hardwired connection until BS 1363 and BS 7671 are also amended.
If you rent
You're not waiting on a standard. Under the Renters' Rights Act 2025, your landlord cannot unreasonably refuse non-structural improvements. A portable, no-drilling balcony solar setup is the cleanest case for that protection. See the renter's guide and our landlord permission template.
Installation note (May 2026)
"Plug-in solar" is now a real UK product category. "Plug into a wall socket" is not yet a UK-authorised installation method. Until BS 1363 and BS 7671 are updated, the only compliant install path is a CPS-registered electrician with a hardwired connection. The savings figures are the same either way — the difference is the install fee, not the kit cost.
How we'll update this tracker
This page is reviewed monthly. Substantive changes — a published BSI standard, a confirmed BS 1363 or BS 7671 amendment, a DESNZ policy statement, or a major DNO position change — are logged with a dated note. We cite primary sources by name: BSI, IET, Ofgem, DESNZ, and the four UK DNOs (UKPN, NGED, NPG, SSEN). For the regulator side of plug-in solar, see our G98 / DNO notification guide.
For the wider picture of how this map onto your energy bill, use the balcony solar savings calculator or read how much can balcony solar save you.
Frequently asked questions
When is the BSI plug-in solar standard expected to publish?
July 2026 is the publication target. As with any BSI work, the date can shift — we update this tracker monthly.
Will I be able to plug a kit into a wall socket the day the BSI standard publishes?
No. The BSI standard certifies the product, not the installation method. BS 1363 (plugs and sockets) and BS 7671 (wiring regulations) would also need to be amended for DIY plug-in installation to be authorised. As of May 2026 there is no published timeline for either amendment.
Do I need to wait until July 2026 to buy?
No. EcoFlow STREAM 800W kits are sold in the UK now from around £499. The compliant 2026 install route is a CPS-registered electrician with a hardwired connection. Annual savings (£100–£180 for a south-facing 800W system in central England) are the same whether you buy now or post-July.
Does the BSI standard cover battery storage?
The headline standard is a plug-in solar product specification. Battery storage is governed by separate UK and European product standards. For battery-specific guidance see our plug-in solar with battery guide.
Educational information only. This page tracks UK plug-in solar regulation in plain English. It is not legal, electrical, or financial advice. Verify with BSI, the IET, your DNO, and a CPS-registered electrician before installing any solar generating equipment. Last reviewed May 2026.