New rules permitting the sale of plug-in solar systems in major UK retailers took effect on 27 August, with implementation accelerated after this year's Middle East-driven energy price rise. As a result, devices generating up to 800W can now be sold in shops including Lidl, Amazon, Argos, Currys and B&Q.
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The systems covered by the law must plug directly into an ordinary outdoor socket rather than being wired into a property's main fuse board, meaning that no electrician is required. Buyers must still register the device with their local electricity network operator through a short online form before switching it on. Ministers say the kits have passed independent safety testing to a UK specification stricter than Germany's. The Department for Energy Security and Net Zero (DESNZ) puts the maximum average saving at £110 a year, though independent estimates suggest a more typical range of £70 to £110, against upfront costs of £400 or more.
An accelerated timeline
DESNZ opened its consultation on the rules in June, publishing its response and the technical Interim Product Specification on 16 July alongside the statutory instrument that brought the changes into force. Energy Secretary Miatta Fahnbulleh described plug-in solar as “a simple, affordable way for households to take control of their energy bills and start saving straight away.”
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The product-safety rules apply in England, Wales, Scotland and Northern Ireland, but the grid-connection provisions only extend to Great Britain, and a related change removing the need for planning permission in most cases applies only in England. Northern Ireland is excluded from lawful use of the devices pending separate action by the NI Executive.
Germany's head start
The small-scale solar market is already well established elsewhere in Europe. Germany, where plug-in solar first took off under looser technical rules, installed around 500,000 units last year alone, and the format is common in several other EU member states. The UK's version arrives with a lower power ceiling and a mandatory grid-operator registration step that most of its European counterparts don't require. (TF)
