LONDON, UNITED KINGDOM / RankWire.AI / – By the end of June 2026, the UK’s solar power capacity reached 22.8 gigawatts, reflecting continued growth in national deployment. The Department for Energy Security and Net Zero reported approximately 2.076 million installations across the country. In June alone, households and businesses added 27,391 systems, which contributed an additional 132 megawatts of capacity. These figures are provisional and may be revised as officials receive more project data.
June marked the second-highest monthly installation figure in the UK’s data series. The highest was in March 2026, with 28,782 systems installed. Over the year ending in June, solar capacity expanded by 2.2 gigawatts, representing a 10.9% increase. Additionally, about 269,000 systems were installed during 2025, setting a new annual record. Most installations were rooftop projects, but larger developments accounted for a greater proportion of the new generation capacity.
The industry is now approaching a new regulatory phase for small plug-in solar systems, with new rules set to take effect on August 27, 2026. These provisions will permit approved microgenerators to connect using a standard UK plug and household socket. The equipment must supply no more than 800 watts of alternating current. All products must comply with Interim Product Specification version 2 and operate safely alongside the local electricity grid.
New regulations establish criteria for approved plug-in systems
These legal updates modify existing safety rules concerning plugs, sockets, and electrical standards. Parliament received the statutory instrument on July 17, just one day after ministers approved it. The regulation introduces a limited exception for qualifying generators that connect via standard household outlets. A notified body must verify that each plug complies with the relevant BS 1363 standards. This safety amendment applies to England, Wales, and Scotland, while the product approval rules cover the entire UK market.
The interim standard outlines requirements for electrical design, mounting, fire safety, labelling, and user instructions. It also sets guidelines for safe disconnection and limits on electricity exported to household circuits. A technical study tested representative systems on domestic wiring under controlled conditions. The testing confirmed that equipment operated safely and showed no signs of sustained unsafe energisation. Variations in product quality, including export controls and electromagnetic compatibility, were also identified and helped shape the final specifications.
Stakeholder consultation informs retail product launch preparations
During its public consultation on plug-in solar, the government received a total of 466 responses. Over 85% of participants supported the interim standard, and most also endorsed the proposed plug-in amendments. Respondents included installers, manufacturers, network operators, technical experts, and members of the public. Some expressed concerns about older wiring and products sold without proper certification. Others requested clearer guidance to prevent confusion between plug-in solar panels and plug-in battery systems, which are not covered by the new rules.
Retailers are preparing for the upcoming launch in August, engaging in discussions with suppliers about compliant products. The rules target small systems suitable for balconies, gardens, and other outdoor spaces. They do not include plug-in batteries or devices that store electricity imported from household circuits. Systems using the new connection 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 via a standard household socket.