The table below provides estimates of the potential benefits and costs of installing different quantities of solar PV panels at your school

Capacity(kWp) Panels Area (m2) Annual self consumed solar electricity (kWh) Annual exported solar electricity (kWh) Annual output from panels (kWh) Reduction in mains consumption Annual saving Estimated cost Payback years
1 3 4 880 0 880 0.22% £130 £2,400 18 years
2 7 10 1,800 0 1,800 0.44% £260 £3,200 12 years
4 13 19 3,500 0 3,500 0.88% £530 £4,800 9 years
8 27 39 7,000 0 7,000 1.8% £1,100 £7,900 7 years
16 53 76 14,000 0 14,000 3.5% £2,100 £14,000 7 years
32 107 154 28,000 3.9 28,000 7.1% £4,200 £26,000 6 years
64 213 307 54,000 2,100 56,000 14% £8,200 £49,000 6 years
128 427 615 91,000 21,000 110,000 23% £15,000 £89,000 6 years
256 853 1,228 130,000 95,000 220,000 33% £24,000 £150,000 6 years
440 1,450 2,088 160,000 230,000 380,000 39% £35,000 £180,000 5 years

Our analysis

Installing solar PV at your school will reduce the electricity you consume from the national grid, and reduce your school's carbon emissions.  Your PTA might be prepared to help you raise some of the cost of installing the panels. 

The estimates in the table assume you have roof space and that is it roughly south facing - as this is best for schools whose peak demand is during the middle of the day when south facing panels produce the most electricity.

The benefits of solar PV will be reduced if you make your school more energy efficient. However, if you want your school to reduce its carbon emissions you should consider both installing solar panels and reducing your electricity consumption.