Solar Panels in the SA3 Postcode Area
The SA3 postcode area covers Mumbles and surrounding areas in Swansea. A typical 4kWp solar panel system here generates around 3,544 kWh per year, saving an estimated £992/yr on electricity bills and covering roughly 93% of average household electricity usage.
Solar Performance in SA3
About Solar in SA3, Mumbles
Homeowners in the SA3 postcode area are eligible for 0% VAT on solar panel installations, making 2026 an excellent time to invest in solar energy. With 886 kWh generated per kWp of installed capacity, the SA3 area benefits from near-average solar irradiance for the UK.
Through the Smart Export Guarantee (SEG), you can also earn money by exporting surplus electricity back to the grid. Most MCS-certified installations in Swansea qualify for SEG payments from energy suppliers.
Swansea in Wales generates 880 kWh per kWp, about 4% below the UK average of 920 kWh/kWp. Wales's second city sits on the stunning Gower Peninsula, the UK's first Area of Outstanding Natural Beauty, and its south-facing Swansea Bay position provides some of the best solar conditions in Wales.