How Solar Panels Work in the UK
Solar photovoltaic (PV) panels convert sunlight into electricity, even on cloudy days. The UK receives enough solar irradiance to make panels a genuinely worthwhile investment, particularly across southern and central England. A typical south-facing 4 kW system generates around 3,600 kWh per year — enough to cover a significant chunk of an average household's annual consumption.
MCS Certification
To qualify for the Smart Export Guarantee and most government support, your installation must be carried out by an MCS-certified installer. MCS (Microgeneration Certification Scheme) ensures the installer meets quality standards and the equipment is properly rated. Always check your installer's MCS registration before signing a contract. An MCS certificate is also required if you want to claim export payments from your energy supplier.
Planning Permission
In most cases, solar panels fall under permitted development and do not require planning permission. There are exceptions: listed buildings, conservation areas, and installations that protrude more than 200mm from the roof surface. Ground-mounted systems also have size limits. If you are in any doubt, check with your local planning authority before installation. For flats and maisonettes, you will typically need formal planning consent.
Battery Storage
Adding a home battery (typically 5–13 kWh capacity) lets you store surplus solar energy generated during the day and use it in the evening. This can push your self-consumption rate from around 50% up to 80% or more, significantly increasing your savings. Battery costs have fallen in recent years — a typical home battery now costs £2,500 to £5,000. The payback on a battery alone is longer than panels, but the combination maximises your total return and provides resilience during power cuts.
Smart Export Guarantee (SEG)
The SEG requires licensed electricity suppliers with 150,000 or more customers to offer a tariff for exported solar electricity. Rates vary between suppliers — some offer as high as 15p/kWh, others as low as 1p/kWh. You must have an MCS-certified system and a smart meter to participate. Compare SEG tariffs regularly, as rates change and you can switch supplier for better deals.
Government Grants
The ECO4 scheme (Energy Company Obligation) provides funding for energy efficiency measures including solar panels, but eligibility is typically limited to low-income households or those on certain benefits. Some local authorities run their own solar panel grants or group-buying schemes that can reduce installation costs by 20–30%. Check your local council's website and the government's Simple Energy Advice service for current offers in your area. VAT on residential solar panel installations is currently 0%, making now a particularly good time to invest.