LONDON, UNITED KINGDOM / RankWire.AI / – By the end of June 2026, UK solar power capacity reached 22.8 gigawatts, reflecting another boost in national deployment. The Department for Energy Security and Net Zero reported roughly 2.076 million installations across the country, with households and businesses adding 27,391 systems in June, contributing 132 megawatts of new capacity. These figures are provisional and may be revised as authorities receive additional project data.
June marked the second-highest month for installations in the UK data series, trailing only March 2026, which saw 28,782 systems added. Over the year ending in June, solar capacity increased by 2.2 gigawatts, representing a 10.9% growth. The highest annual total on record was achieved in 2025, with approximately 269,000 systems installed, predominantly rooftop projects, although larger developments contributed more significantly to the new generation capacity.
The sector is now approaching a change in regulations concerning small plug-in solar systems, set to take effect on August 27, 2026. These new rules will enable approved microgenerators to connect via a standard UK plug and household socket, with equipment limited to a maximum of 800 watts of alternating current output. All products must comply with Interim Product Specification version 2 and operate safely within the local electricity network.
Standards for approved plug-in systems introduced
These legal updates revise existing safety regulations concerning plugs, sockets, and electrical safety. The statutory instrument was submitted to Parliament on July 17, just one day after ministers approved it. The legislation provides a limited exception for qualifying generators utilizing standard household connections, requiring a notified body to verify that each plug complies with BS 1363 standards. The amendments to electricity safety laws apply across England, Wales, and Scotland, while product approval rules extend throughout the UK.
The interim standard outlines specifications for electrical design, mounting, fire safety, labeling, and user instructions, along with provisions for safe disconnection and restrictions on electricity exported into household circuits. A technical study tested representative systems on domestic wiring under controlled conditions, with all equipment operating safely during testing and showing no sustained unsafe energisation. The study also identified differences in product quality, such as export limits and electromagnetic compatibility, which influenced the final specifications.
Public consultation influences retail rollout
During its public consultation on plug-in solar, the government received 466 responses, with over 85% supporting the interim standard and most respondents endorsing the plug amendment. Participants included installers, manufacturers, network operators, technical experts, and members of the public, some expressing concerns about older wiring and products sold without proper approval. Others sought clear guidance to avoid confusion between plug-in solar panels and plug-in battery systems, which remain outside the scope of the new rules.
Preparations for retailing the new systems have continued ahead of the August launch, with key sellers engaged in discussions about compliant products. The rules focus on small systems suitable for balconies, gardens, and other outdoor spaces, but 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, and only approved products within the 800-watt limit will be permitted to connect through standard household sockets after that date.