InstaGen, The Solar Centre and Octopus Energy are all preparing plug-in solar kits for UK households, with InstaGen kits due to be available by the end of September 2026 at a recommended retail price of £5491. The Solar Centre has two starter kits in the pipeline, and Octopus Energy is offering two bundles with estimated delivery at the end of September1.
Plug-in solar kits became available to buy online and on the high street at the end of August 2026, after UK standards changed. Before 27 August 2026, UK standards only permitted solar power generation that was permanently connected, which means wired into the mains by a qualified electrician1. Kits typically include one or two solar panels, a microinverter, a lead fitted with a standard three-pin plug, mounting brackets and a monitoring app1. According to government estimates, a plug-in panel system could save households between £70 and £110 a year1.
The rules for a compliant installation are specific. The total panel capacity must be no more than 2,000W across a maximum of four panels, with no more than two in series, and the inverter output must be capped at a maximum of 800VA1. Professional advice should be sought for devices with a total maximum power above 960W1. The kit must have a factory-fitted, non-rewirable moulded UK plug fitted with a fuse not exceeding 5A, and must be certified as a complete package meeting the government's Interim Product Specification and verified compliant on the ENA G98 Type Test Register1.
Only one plug-in solar kit is allowed per home, so kits cannot be linked together or plugged into different sockets, and the kit must be plugged directly into a permanent wall-socket circuit. Extension leads and multi-socket adaptors are prohibited1. The householder must notify the local Distribution Network Operator within 28 days of installing plug-in solar1.
| Rule | Limit |
|---|---|
| Total panel capacity | No more than 2,000W across a maximum of four panels |
| Panels in series | No more than two |
| Inverter output | Capped at a maximum of 800VA |
| Plug fuse | Not exceeding 5A |
| Kits per home | One |
| DNO notification | Within 28 days of installation |
"Unlike rooftop solar, you can't use them to sell excess power back into the grid, so you do need to use the electricity as and when it's generated."
Why it matters for households
Plug-in solar is aimed at households that cannot fit rooftop panels, including renters, leaseholders and flat dwellers with a balcony but no roof of their own1. The panels can be unplugged and removed, so they can move with the householder1. Because the electricity feeds directly into the home's existing wiring, any appliance switched on during daylight uses the solar power first, reducing the amount bought from the grid1. Households that are at home during the day will benefit most; where no one is home, the system still supplies baseload energy such as a fridge or router, and any unused power flows into the grid1.
Plug-in kits cannot currently earn Smart Export Guarantee payments. Only Microgeneration Certification Scheme or Flexi-Orb approved solar installations with suitable export metering are eligible for SEG payments1. Which? notes that savings depend on lifestyle and pattern of energy use, and that a household may not save enough to pay back the cost of the panels1. It also notes that an electrical safety check may cost £100 to £250, and installing a single outdoor socket a further £150, according to Checkatrade1.
Planning rules treat plug-in solar as permitted development for most houses, with exceptions for listed buildings and homes in conservation areas, National Parks, National Landscapes, the Broads or World Heritage Sites1. Panels must not be attached to anything wooden, such as a timber fence, gate, wooden balcony or building with timber cladding1. Wall-mounted panels on houses may stick out no more than 0.4m, reduced to 0.2m if the wall faces a road, and the same rules apply to balcony-mounted panels1. Ground-mounted panels in gardens may be no more than 9 square metres in total1.
What happens next
InstaGen kits are due by the end of September 2026 at an RRP of £549, The Solar Centre has two starter kits in the pipeline, and Octopus Energy's two bundles have estimated delivery at the end of September1. Which? states that Northern Ireland has its own safety regulations, which have not yet been fully revised, and advises waiting for further updates before buying a plug-in solar kit there1.