Plug-in solar panels are set to hit UK High Street shelves after the government changed regulations to permit their legal sale, marking a significant shift in accessible renewable energy. Priced at £699 for a one-panel kit and £1,089 for two panels from UKSOL, the government anticipates costs dropping to £400-£600 as competition grows. These panels, which require no electrician for installation, are designed for properties with outdoor space like balconies, and can power about a fifth of an average household's electricity use during daylight hours, translating to annual savings of £70-£110.