LONDON, UNITED KINGDOM / RankWire.AI / – UK solar power capacity reached 22.8 gigawatts by the end of June 2026, according to the Department for Energy Security and Net Zero. The department recorded approximately 2.076 million installations nationwide. During June, households, businesses, and developers added 27,391 systems, which contributed an additional 132 megawatts of capacity. The figures may be revised as more project data is incorporated into the national database. This total encompasses installations on domestic rooftops, commercial premises, and utility-scale solar farms.
June ranked as the second-highest month for new installations within the UK data series, with March 2026 holding the record at 28,782 added systems. Over the year leading up to June, solar capacity increased by 2.2 gigawatts, reflecting a growth rate of 10.9%. The market also saw a record-breaking annual addition of roughly 269,000 systems in 2025. Smaller rooftop arrays dominated the installation count, although larger projects contributed significantly to the overall increase in generating capacity.
Focus now shifts to the upcoming plug-in solar rules scheduled to take effect on August 27, 2026. This framework permits approved microgenerators to connect via a standard UK plug and household socket. Eligible products are limited to an output of no more than 800 watts of alternating current. They must comply with Interim Product Specification version 2 and operate safely within the local distribution network. Devices such as plug-in batteries and those storing electricity imported from household circuits are excluded under these regulations.
Safety regulations oversee plug-in connection standards
The legislative update revises the Plugs and Sockets Safety Regulations 1994 along with the Electricity Safety, Quality and Continuity Regulations 2002. The UK Parliament received the statutory instrument on July 17, just one day after ministers approved it. This amendment introduces a specific exception to existing restrictions on plugs used for generating equipment. Each plug must be verified by a notified body to meet the relevant BS 1363 standards. While product approval is applicable across the UK, the safety regulation amendment covers England, Wales, and Scotland.
The interim specification stipulates requirements for electrical design, mounting systems, fire safety, labelling, and consumer instructions. A technical study tested representative plug-in solar products on domestic wiring under controlled conditions, confirming stable operation and the absence of sustained unsafe energisation or unacceptable thermal effects. The study also identified differences in export controls, electromagnetic compatibility, and overall product quality, providing data that shaped the UK-specific safety standards necessary for legal market entry.
Retailers prepare for approved plug-in products
The government conducted a consultation that received 466 responses from businesses, experts, regulators, and the public. Over 85% of participants supported the interim specification, with most also endorsing the plug-in amendment. Contributors included manufacturers, installers, network operators, electricians, academics, and consumer groups. Some respondents raised concerns about older household wiring, noncompliant online products, and the need for clear user instructions. Others urged authorities to differentiate plug-in solar panels from plug-in battery systems.
Retail chains such as B&Q, Currys, Amazon, and Lidl are actively preparing for the new category of products. This connection option is designed for households unable to install conventional rooftop systems, including some renters and residents with balconies or outdoor spaces. Systems utilizing this new plug-in method will not be legally operable before August 27. After that date, only approved products within the 800-watt limit will be permitted to connect through a standard household socket. The capacity total for June does not include systems that will adopt the new plug-in connection framework.