Example installation

Before

Before installation, this house uses 3500 units, all bought from the grid.

picture of house buying all electricity from the grid



The current annual electricity bill is:  
Electricity bought (13p / unit) £455
Payment to electricity company £455

The owners install a 4kWp system, costing £10,000, and generate approx 3000 units of electricity a year (based on 750 units per kWp installed). Electricity companies assume that 50% of the electricity generated is exported. Most households only use about 30% of their total electricity demand during daylight, so the owners would use 1050 units (0.3 x 3500) of FREE solar power. During the night or on dull days, they would still buy some electricity from their supplier.

After

picture of a house with solar panels


The new annual bill is:  
Feed In Tariff Income (21p per unit) £630
+
  
Exported electricity income (3.1p per unit) £47
-
  
Electricity bought (13p per unit) £319
Cheque from electricity company
 £358

Get a cheque each year instead of a bill and use FREE electricity generated
Combined income & savings of £813