LONDON, UNITED KINGDOM / RankWire.AI / – UK solar power capacity reached 22.8 gigawatts by the end of June 2026. The Department for Energy Security and Net Zero reported approximately 2.076 million installations nationwide. During June, households, companies, and developers added 27,391 systems, generating 132 megawatts of new capacity. Authorities may update these provisional figures as more project data becomes available in the national database. The total includes domestic rooftops, commercial sites, and utility-scale solar farms.
June was the second-best month for installations in the UK data series. March 2026 still holds the record with 28,782 systems installed. Solar capacity increased by 2.2 gigawatts from June last year, a growth rate of 10.9%. In 2025, roughly 269,000 systems were added, marking the highest annual total ever. Small rooftop systems led the installation numbers, while larger projects contributed most to the increase in generating capacity.
The focus now shifts to new plug-in solar rules starting August 27, 2026. The new framework allows certified microgenerators to connect through a standard UK plug and household socket. Eligible products are limited to 800 watts of alternating current output. They must meet Interim Product Specification version 2 and ensure safe operation with the local distribution network. Batteries and devices that store imported household electricity are excluded from these rules.
Safety regulations oversee plug-in connections
This legal update revises the Plugs and Sockets Safety Regulations 1994 and the Electricity Safety, Quality and Continuity Regulations 2002. The UK Parliament received the statutory instrument on July 17, a day after ministers approved it. The amendment introduces a specific exception to existing restrictions on generating equipment plugs. Each plug must be confirmed compliant with the relevant BS 1363 standards by a notified body. While product approval applies UK-wide, the safety regulation amendment covers England, Wales, and Scotland.
The interim specs specify requirements for electrical design, mounting, fire safety, labelling, and user instructions. A technical study tested representative plug-in solar products on domestic wiring under controlled conditions. The tests showed stable operation and no sustained unsafe energisation or thermal issues. Variations were found in export controls, electromagnetic compatibility, and overall quality. These findings helped shape the UK-specific safety standard for legal market entry.
Retailers prepare for approved products
The government’s consultation received 466 responses from businesses, specialists, regulators, and the public. Over 85% supported the interim specifications. Most also favored the plug-in amendment. Respondents included manufacturers, installers, network operators, electricians, academics, and consumer groups. Some raised concerns about older household wiring, noncompliant online products, and the need for clear instructions. Others called for clear differentiation between plug-in solar panels and plug-in battery systems.
Retailers such as B&Q, Currys, Amazon, and Lidl are preparing for the new product category. This setup benefits households that cannot install traditional rooftop systems, including renters and those with balconies or outdoor spaces. Systems using the new connection method will be illegal to operate before August 27. After that date, only approved products within the 800-watt limit can connect through a standard household socket. The capacity total for June does not include systems that use the new plug-in framework.