Solar Panels in the BT18 Postcode Area
The BT18 postcode area covers Holywood and surrounding areas in Belfast. A typical 4kWp solar panel system here generates around 3,264 kWh per year, saving an estimated £914/yr on electricity bills and covering roughly 86% of average household electricity usage.
Solar Performance in BT18
About Solar in BT18, Holywood
Homeowners in the BT18 postcode area are eligible for 0% VAT on solar panel installations, making 2026 an excellent time to invest in solar energy. With 816 kWh generated per kWp of installed capacity, the BT18 area benefits from reasonable 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 Belfast qualify for SEG payments from energy suppliers.
Belfast in Northern Ireland generates 815 kWh per kWp, about 11% below the UK average of 920 kWh/kWp. Northern Ireland's capital sits at the head of Belfast Lough, and its relatively sheltered east-coast position gives it lower rainfall than western parts of Northern Ireland, supporting growing solar adoption across the city's housing stock.