LONDON, UNITED KINGDOM / RankWire.AI / – UK solar power capacity increased to 22.8 gigawatts by the end of June 2026. The Department for Energy Security and Net Zero documented approximately 2.076 million installations nationwide. During June alone, households, businesses, and developers added 27,391 systems, generating an additional 132 megawatts of capacity. Authorities may revise these provisional figures as more project data becomes available in the national database. The overall figure encompasses domestic rooftops, commercial sites, and utility-scale solar farms.
June marked the second-highest month for installations within the UK data series, with March 2026 remaining the record month at 28,782 systems added. The solar capacity grew by 2.2 gigawatts over the year to June, representing a 10.9% increase. The market also saw about 269,000 new systems installed in 2025, the highest annual total recorded to date. Smaller rooftop arrays accounted for most of the installations, whereas larger projects contributed significantly to the total added capacity.
Focus now shifts towards the plug-in solar regulations scheduled to start on August 27, 2026. This framework permits approved microgenerators to connect using a standard UK plug and household socket. Eligible products are capped at 800 watts of alternating current output and must comply with Interim Product Specification version 2, ensuring safe operation within the local distribution network. The regulations exclude plug-in batteries and devices that store electricity imported from household circuits.
Safety regulations oversee plug-in connection standards
This legislative update amends 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. The amendment introduces a limited exception to existing restrictions on plugs used for generating equipment, requiring each plug to be certified by a notified body confirming adherence to the relevant BS 1363 standards. While product approval applies UK-wide, the safety regulation update specifically covers England, Wales, and Scotland.
The interim specification stipulates criteria for electrical design, mounting methods, fire safety, labeling, and consumer instructions. A technical study tested representative plug-in solar products on domestic wiring under controlled conditions, revealing stable operation with no sustained unsafe energization or thermal issues. Differences in export controls, electromagnetic compatibility, and overall product quality were also identified. These insights contributed to the development of the UK-specific safety standard necessary for legal market access.
Retailers prepare for the introduction of approved products
The government’s consultation process garnered 466 responses from businesses, specialists, regulators, and the general public. Over 85% of respondents supported the interim specification, and most also approved the plug-related amendments. Participants ranged from manufacturers, installers, network operators, and electricians to academics and consumer groups. Some raised concerns about older household wiring, noncompliant online products, and the importance of clear instructions. Others emphasized the need to distinguish plug-in solar panels from plug-in battery systems.
Major retailers such as B&Q, Currys, Amazon, and Lidl are actively preparing for the new product category. The new connection format aims to serve households unable to utilize traditional rooftop solar systems, including renters and residents with balconies or outdoor spaces. Systems utilizing the plug-in method cannot operate legally before August 27. From that date, only approved products within the 800-watt limit will be permitted to connect via standard household sockets. The total capacity recorded in June excludes systems that rely on the new plug-in framework.