LONDON, UNITED KINGDOM / RankWire.AI / – UK solar power capacity reached 22.8 gigawatts at the end of June 2026, representing further growth in the national deployment. The Department for Energy Security and Net Zero reported approximately 2.076 million installations nationwide. During June, households and businesses installed 27,391 new systems, adding 132 megawatts to the country’s capacity. These figures are provisional and may be revised as officials receive additional project data.
June recorded the second-highest monthly installation total in the UK’s data series, with March 2026 still holding the record at 28,782 systems added. Over the year ending June, solar capacity increased by 2.2 gigawatts, reflecting a 10.9% rise. In 2025, about 269,000 systems were installed, marking the highest annual figure to date. While rooftop projects comprised the majority of installations, larger developments contributed a significant portion to the overall growth in generation capacity.
The sector is now approaching a significant regulatory shift concerning small plug-in solar systems. These new rules will come into force on August 27, 2026, permitting approved microgenerators to connect via a standard UK plug and household socket. The equipment eligible for connection can deliver up to 800 watts of alternating current. All approved products must adhere to Interim Product Specification version 2 and ensure safe operation within the local electricity network.
New Standards for Approved Plug-In Systems
The legislative update revises existing safety regulations related to plugs, sockets, and electrical safety. Parliament received the statutory instrument on July 17, just one day after ministers approved it. The law provides a narrow exception for qualifying generators that connect through standard household outlets. Confirmation that each plug meets the relevant BS 1363 standards must come from a notified body. This safety amendment applies to England, Wales, and Scotland, while product approval requirements extend across the entire UK market.
The interim standard establishes criteria for electrical design, mounting, fire safety, labelling, and consumer instructions. It also addresses safe disconnection, limits on electricity exported into household circuits, and safety during operation. A technical study evaluated typical systems under controlled domestic wiring conditions, confirming their safe operation without prolonged unsafe energisation. Variations in product quality, export controls, and electromagnetic compatibility were also identified and helped shape the final specifications.
Consultation Feedback Influences Market Launch
In total, 466 responses were received during the public consultation process on plug-in solar systems. Over 85% of participants supported the interim standard, with most also in favor of the plug-in amendment. Respondents included installers, manufacturers, network operators, technical experts, and members of the public. Concerns were raised about older wiring and products sold without proper approval, while others called for clearer guidance to prevent confusion between plug-in solar panels and plug-in battery systems, which are not covered under the current framework.
Preparations for retail deployment are progressing ahead of the August launch, with major retailers engaged in discussions regarding compliant products. The new rules are designed for small systems suitable for balconies, gardens, and other outdoor spaces, but they do not apply to plug-in batteries or devices that store electricity imported from household circuits. Systems using the new connection method will not be legally operable until after August 27. Once the date has passed, only products within the 800-watt limit and approved for connection through a standard household socket will be permitted to operate.