When Can You Buy Plug-In Solar in the UK? The 2026 Timeline Explained

The UK government confirmed in March 2026 that plug-in solar systems will be made available for households to buy and self-install. Energy Secretary Ed Miliband and Housing Secretary Steve Reed announced that regulations would be updated to allow systems of up to 800W to connect to a domestic mains socket without a qualified electrician.

Since then, things have moved quickly. The wiring regulations have already been updated, at least partly. The product safety standard is in progress. Retailers are preparing. But the question most people are asking is simple: when can I actually buy one?

Here is the full timeline, what each milestone means, and what you can do right now if you do not want to wait.

The timeline: what has happened and what is coming

24 March 2026: Government announcement

The Department for Energy Security and Net Zero (DESNZ) confirmed that plug-in solar would be legalised in the UK. The announcement named specific retailers (including Lidl and Amazon) and manufacturers that are preparing to bring products to market. The government cited a target price of around £400 for a basic kit and estimated annual savings of around £110 per household.

15 April 2026: BS 7671 Amendment 4 published

Amendment 4 to the IET Wiring Regulations (BS 7671:2018) was published on 15 April 2026. This is a significant update, but it is important to understand what it does and does not cover in relation to plug-in solar.

What Amendment 4 actually introduced: a new Chapter 57 on stationary secondary batteries (covering domestic and commercial battery energy storage systems), Section 716 on Power over Ethernet, Section 545 on functional earthing for ICT equipment, and a complete overhaul of Section 710 on medical locations. It also added explicit requirements around bidirectional protective devices, clarifying that circuit breakers (RCBOs and AFDDs) must be checked for bidirectional compatibility when used with systems that export power, such as solar panels and batteries. If a device is not marked for bidirectional use, it must be assumed to be unidirectional only.

What Amendment 4 did not do: it did not add specific regulations to permit plug-in solar connection via a standard 13A mains socket. There is no new chapter or section in Amendment 4 that authorises DIY socket connection of solar systems. This means that as of today, plugging a solar kit into a UK wall socket remains non-compliant with the wiring regulations.

Why not? The government's political announcement in March was made before the technical safety standards were ready. The IET and BSI work on different timelines to the government. Amendment 4 had been in development for some time and was focused on battery storage, data infrastructure, and medical safety. Plug-in solar requires its own dedicated product standard, which is being developed separately by BSI (see below).

The bidirectional device requirements in Amendment 4 are relevant to plug-in solar because any system that feeds electricity back into your home circuit needs compatible protective devices. But this alone does not make plug-in solar legal. It is one piece of a larger regulatory puzzle.

Amendment 4 is currently in a transition period. The new standards can be used immediately, but the previous version remains valid until 15 October 2026.

July 2026 (expected): BSI product standard

This is the critical missing piece. The British Standards Institution (BSI) is developing a product safety standard specifically for plug-in solar devices sold in the UK. This standard will define what a certified kit must include, how it must behave (anti-islanding, rapid shutdown, power limiting, live pin protection), and what testing it must pass before it can be sold as a self-install product.

Why is this standard necessary? Plugging a solar panel into a UK mains socket today creates three specific risks that current regulations do not adequately address:

First, bidirectional current flow. Power flowing backwards through a standard consumer unit can damage circuit breakers that are designed for one-way current only. Amendment 4 now warns about this, but does not provide a plug-in solar framework to manage it.

Second, live pin risk. If you unplug a solar panel while it is generating, the pins on the plug could be live, creating a shock hazard. Certified inverters must cut power within milliseconds of disconnection, but generic imported kits often lack this safety feature.

Third, RCD blinding. Some solar inverters leak DC current. If this flows through a standard Type AC or Type A RCD, it can prevent the RCD from tripping during a fault elsewhere in your home. This is a serious hidden safety risk.

The BSI product standard will address all three issues by certifying only kits that have built-in protections against each risk. Once published, manufacturers can certify their products against it, and retailers can legally stock them as self-install plug-in solar kits.

The July 2026 date is an industry estimate, not a confirmed deadline. Some industry observers suggest the timeline could slip towards late summer or early autumn 2026.

Late 2026: ENA updates G98 grid connection rules

After the BSI product standard is published, the Energy Networks Association (ENA) is expected to update Recommendation G98, the rules governing how small-scale generation connects to the distribution grid. This update will formally allow BSI-certified plug-in solar devices to connect without the current notification process being a barrier.

Late 2026 to early 2027: widespread retail availability

Realistically, most UK households will be able to walk into a shop or order online and buy a BSI-certified plug-in solar kit from late 2026 onwards. Lidl, Amazon, and other major retailers have indicated they will stock these products, but none have confirmed exact launch dates. The pace depends entirely on when the BSI standard is finalised.

Future: IET references the new standard

The IET may issue a corrigendum (a formal correction or addition) to BS 7671 to reference the new BSI product standard, or it may wait until a future Amendment 5 to formally incorporate plug-in solar into the wiring regulations. Either way, this is not a blocker for consumers. Once the BSI product standard is published and kits are certified, they can be sold and used.

What does this mean in practice?

Right now, in June 2026, the situation is this:

You cannot legally plug a solar panel into a UK mains socket. Amendment 4 is live but does not authorise plug-in solar connections. The BSI product standard has not yet been published. Until it is, no kit has been formally certified for DIY self-connection in the UK. European CE marks and German VDE certification do not automatically transfer post-Brexit. If you buy a generic kit and plug it into a socket today, it is non-compliant with your home wiring regulations and could create issues with your home insurance.

You can legally install a compact solar system via a fixed electrical connection. This is what Thunder Energy has been doing across Greater London since before the government announcement. Our Storm kits use the same hardware (flexible solar panels and Hoymiles HMS-800W-2T microinverter) that will eventually be used in plug-in systems. The difference is the connection method: instead of a mains plug, a qualified electrician connects the system via a fused spur on a dedicated radial circuit.

This approach is fully compliant with current BS 7671 regulations, including Amendment 4. The Hoymiles HMS-800W-2T microinverter has anti-islanding protection, rapid shutdown capability, and is compatible with bidirectional protective devices. When the plug-in standards take full effect, the panels and microinverter stay exactly the same. Only the connection point changes.

Why you might not want to wait

There are several practical reasons to install a compact solar system now rather than waiting for plug-in kits to appear in shops.

You start saving immediately. Every month you wait is a month of electricity bills you could have reduced. A Storm 710W kit generates up to 530 kWh per year, saving up to £140 annually at current electricity rates. If you install now and the plug-in standard comes into effect later this summer, you will have already been generating for months.

The hardware is identical. A Thunder Storm kit uses the same Hoymiles HMS-800W-2T microinverter that plug-in systems across Europe use. The same flexible panels. The same MC4 connectors. The same monitoring app. When plug-in becomes fully legal, your system is already installed and generating.

Professional installation means full compliance today. With a fused spur installation by a qualified electrician, your system meets all current UK regulations including the new Amendment 4 requirements around bidirectional protective devices. There is no grey area, no risk of insurance issues, and no need to worry about whether a product has BSI certification yet.

Retail kits may be more expensive. The government's £400 estimate is for a basic kit without installation. When you factor in the cost of a BSI-certified product with UK-specific compliance features, retail prices may be higher. Thunder's Storm 360W kit starts at £499 including panels, microinverter, cabling, and mounting hardware. Professional installation across Greater London is £399 additional.

Buying a generic kit now is risky. Some sellers are already marketing "plug-in solar kits" for UK use, but without BSI certification these kits may not have the safety features required by the upcoming standard. You could end up with a product that is non-compliant, uninsurable, or needs to be replaced once certified kits become available.

What will change when plug-in becomes fully legal?

When the BSI standard is published and certified kits appear in shops, the main changes will be:

Connection method. You will be able to connect a certified kit via a standard mains plug rather than a hardwired fused spur. This means no electrician is needed for the connection step, which saves approximately £200 to £400.

Retail availability. You will be able to buy kits from high street retailers, supermarkets, and online marketplaces. This will increase competition and may drive prices down over time.

Simplified DNO notification. The government has said it will work with Ofgem and the Energy Networks Association to streamline the G98 notification process for plug-in systems. Currently, any grid-connected system requires a G98 notification to your local Distribution Network Operator within 28 days.

What will not change: the 800W output limit, the need for G98 notification (even if simplified), the performance characteristics of the panels and microinverter, or the amount of electricity your system generates. A 710W system installed via fused spur today will produce exactly the same output as a 710W plug-in system installed next year.

What to do right now

If you want to start generating solar electricity today without waiting for the BSI standard:

Option 1: Buy a Thunder Storm kit and self-install the panels. You mount the panels yourself on your balcony, fence, or wall, and book a local electrician to connect the system via fused spur. In Greater London, Thunder offers professional installation for £399.

Option 2: Buy a Thunder Storm kit and wait. Purchase the kit now, mount the panels, and leave the electrical connection until the plug-in standard is published. Once BSI-certified kits can legally connect via a mains plug, you connect your system yourself. The Hoymiles HMS-800W-2T microinverter is the same unit used in European plug-in systems and will be compatible with the UK plug-in connection method.

Option 3: Wait for retail kits. If you prefer to buy a plug-in kit from a retailer, the earliest realistic availability is late summer 2026. Keep in mind that early retail availability may be limited, and prices during the initial launch period are likely to be higher than they will be once the market matures.

Whichever option you choose, the economics of compact solar are clear. A 710W system saves up to £140 per year. Add a battery and savings increase to nearly £300 per year through a combination of solar self-consumption and smart tariff arbitrage.

Frequently asked questions

Can I buy plug-in solar panels in the UK right now?

You can buy solar panels, microinverters, and complete kits right now. What you cannot do yet is legally connect them to a mains socket yourself. The BSI product standard that will enable true self-install plug-in solar is expected around July 2026. Until then, the compliant route is a hardwired connection via a fused spur installed by a qualified electrician.

Is plug-in solar legal in the UK?

Not yet in the "plug-and-play" sense. The government has announced its intention to legalise it, and the wiring regulations have been partially updated, but the BSI product standard required to certify kits for socket connection has not been published. Installing a compact solar system via a hardwired fused spur connection by a qualified electrician is fully legal and compliant with all current regulations.

How much will plug-in solar cost in the UK?

The government has cited a target price of around £400 for a basic kit. Thunder Energy's Storm 360W kit (two flexible panels, Hoymiles microinverter, cabling, and mounting hardware) is currently £499. The Storm 710W kit (four panels) is £649. Professional installation across Greater London is £399 additional. Prices may change as the market develops.

Do I need planning permission for plug-in solar?

No. Solar panels mounted on the walls or fences of a domestic property are generally permitted development and do not require planning permission, provided they do not protrude more than 200mm from the wall surface. Listed buildings and conservation areas may have additional restrictions. Check with your local planning authority if you are unsure.

Can I install plug-in solar if I rent?

Yes. Under the Renters' Rights Act 2025, tenants can request permission from their landlord to install plug-in solar, and landlords cannot unreasonably refuse. Plug-in solar is particularly attractive for renters because the system is portable and can be taken with you when you move.

Will plug-in solar affect my home insurance?

This depends on your insurer and how the system is installed. A system installed by a qualified electrician with appropriate certification (NICEIC or equivalent) is unlikely to cause insurance issues. Connecting a generic, non-certified kit to a mains socket before the BSI standard is published could create complications with your home insurance, as it would be non-compliant with current wiring regulations. If in doubt, notify your insurer before installation.

Is 800W enough to make a difference?

Yes. An 800W system will not power your entire home, but it can cover your base load: the electricity used by always-on appliances like your fridge, router, phone chargers, and standby devices. A 710W system generates up to 530 kWh per year, saving up to £140 annually. Add a battery and savings can reach nearly £300 per year.

What happens if I install now and plug-in becomes legal later?

Nothing changes with your system. The panels and microinverter are the same hardware used in plug-in systems across Europe. If you currently have a fused spur connection, you can choose to keep it (it is a permanent, compliant connection) or switch to a plug connection once certified plug adapters become available. There is no disadvantage to installing now.

Will the government offer grants or subsidies for plug-in solar?

No grants or subsidies for plug-in solar have been announced as of June 2026. However, all solar panels and batteries are currently zero-rated for VAT (0% VAT) until at least March 2027. This effectively gives you a 20% discount compared to the standard VAT rate. The government's Solar Roadmap targets 47 GW of solar capacity by 2030, and future incentive schemes are possible but not confirmed.

What did BS 7671 Amendment 4 actually change for solar?

Amendment 4 did not add specific rules for plug-in solar. Its main additions were Chapter 57 (battery energy storage systems), Section 716 (Power over Ethernet), and Section 545 (ICT functional earthing). However, it did introduce important requirements around bidirectional protective devices, clarifying that circuit breakers must be rated for reverse current flow when used with solar or battery systems. This is relevant groundwork for plug-in solar but does not, by itself, make socket connection legal. The BSI product standard is the missing piece.