A 4kWp system can generate around 3,800 kilowatt hours of electricity a year in the south of England – roughly equivalent to a typical household's electricity needs. It will save nearly two tonnes of carbon dioxide every year. A 4kWp system in Scotland can generate about 3,200 kilowatt hours of electricity a year – more than three quarters of a typical household's electricity needs. It will save more than a tonne and a half of carbon dioxide every year.
| Location |
System size
|
Feed-in-Tariff generation payment (£/year)
| Feed-in-Tariff export payment (£/year) |
Electricity bill savings (£/year)
|
Carbon dioxide savings (kgCO2/year)
| |
|---|---|---|---|---|---|---|
| Valid between 1st April - 30th June 2015 | Valid between 1st July - 30th September 2015 | |||||
| London, South England | 4kWp | £510 | £495 | £90 | £135 | 1,870 kg |
| Aberystwyth, Wales | 4kWp | £480 | £460 | £85 | £125 | 1,750 kg |
| Manchester, North England | 4kWp | £450 | £435 | £80 | £120 | 1,650 kg |
| Stirling, Scotland | 4kWp | £425 | £410 | £75 | £110 | 1,560 kg |
The average domestic solar PV system is 4kWp and costs £5,000 - 8,000 (including VAT at 5 per cent).
When Fits (Feed-in Tariff ) were first launched in 2010, a typical large domestic photovoltaic system cost £15,000-£18,000 to install. Early adopters were promised 41.3p per kilowatt hour (kWh) generated for 25 years, plus generous savings on their electricity bills worth up to £160 a year. Incomes and savings of more than £30,000 were promised for a £15,000 investment.
Price falls in PV panels over the past five years mean that the same system can now be installed for £5,000-£6,000 – and the government has responded by cutting the income paid accordingly. Those installing a system before 30 September this year now receive 12.92p per kWh if they live in a home that is energy performance certificate band D or above.
You still need a south facing, unshaded roof, ideally at a 45-degree pitch. Those who live in the south will get the highest income. Someone installing a £6,000 panel system on such a roof in Hertfordshire can expect an income and electricity bill savings of around £600 a year. Payments are index linked and are guaranteed for the next 20 years.
For an accurate calculation of how much your roof will generate use the EnergySavingsTrust calculator.
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