LONDON, UNITED KINGDOM / RankWire.AI / – UK solar capacity reached 22.8 gigawatts by the end of June 2026, marking a significant increase in deployment. The Department for Energy Security and Net Zero reported approximately 2.076 million installations across the country. During June alone, developers added 27,391 systems, generating 132 megawatts. These latest monthly figures are provisional and could be updated as additional projects are included in the official dataset. The total includes rooftop arrays, commercial setups, and large solar farms. This milestone also establishes a baseline ahead of the implementation of new plug-in solar regulations.
June saw the second-highest monthly installation count ever recorded in the UK. Only March 2026 surpassed it with 28,782 installations. Over the 12 months ending in June, solar capacity grew by 2.2 gigawatts, representing a 10.9% increase. The country also recorded 269,000 installations in 2025, the highest annual figure so far. Most of these installations that year were on residential, commercial, and other building types. Utility-scale projects continued to expand the overall solar generation capacity within the UK.
The upcoming regulatory change is scheduled for August 27, when amendments related to plug-in solar systems will come into effect. These rules introduce an approval process for small generators that connect via a standard UK plug and socket. Eligible devices are limited to delivering no more than 800 watts of alternating current output. They must work in conjunction with the electricity distribution network and meet the standards of Interim Product Specification version 2. Notably, the framework excludes plug-in batteries and devices intended to store electricity imported from a household circuit.
Safety standards define new plug-in guidelines
This framework updates the Plugs and Sockets Safety Regulations 1994 along with the Electricity Safety, Quality and Continuity Regulations 2002. Parliament received the statutory instrument on July 17, a day after ministers approved it. A notified body may grant approval to a standard plug if it complies with relevant BS 1363 standards and the product specifications. This exception addresses an existing restriction on plugs used to connect generating equipment to sockets. While product approval applies across the UK, the electricity safety amendment is specific to England, Wales, and Scotland.
The interim specification covers electrical design, British plug standards, mounting systems, fire safety measures, and product labelling. It sets out the conditions that equipment must meet before being legally sold and connected. An electrical safety study tested representative plug-in solar systems on UK domestic wiring, demonstrating stable operation under test conditions. The study found no signs of unsafe energisation or thermal risks. It also noted differences in product quality, including export limitations and electromagnetic compatibility. These findings helped inform a UK-specific specification and provided clear guidance for consumers.
Public consultation shapes retail readiness for plug-in solar
The government’s consultation received 466 responses from businesses, technical experts, regulators, and the public. Over 85% of respondents supported the interim product specification, with a majority endorsing the proposed plug-in amendment. Participants included energy suppliers, electricians, manufacturers, network operators, academics, and trade associations. Some raised concerns about older household wiring and the sale of noncompliant products on online marketplaces. Others warned that consumers might confuse the rules with permissions for plug-in batteries. The government plans to publish consumer guidance when the regulations are implemented.
Retailers such as B&Q, Currys, Amazon, and Lidl engaged in preparations for the plug-in solar launch prior to the conclusion of the consultation. This format is aimed at households unable to install conventional rooftop systems, including some renters and residents with balconies or outdoor spaces. The June total capacity excludes systems operating under the new plug-in framework. Devices cannot legally use the amended route before August 27. Starting then, only approved products that meet the 800-watt limit and interim safety standards can connect via a standard household socket.