What savings can I expect in Hemel Hempstead?

Savings depend on how much of the electricity you use at home, your tariff and your export rate, so we do not quote a one-size figure. What can be modelled is generation: the European Commission's PVGIS tool estimates about 1,021 kWh a year per kilowatt-peak for south-facing panels at a 35-degree pitch in Hemel Hempstead. Using that power yourself can be worth more than exporting it: the Energy Saving Trust says export typically earns around 12p a unit through the Smart Export Guarantee, while you would normally pay more than twice that to buy electricity. Smart Export Guarantee payments require an MCS-certified installation.