Savings is based on £58.80/month, an average UK household electricity cost of £0.228/kWh, assuming the assets are paid over an 20-year payment term.

Projected lifetime savings are calculated on a fixed system price, taking into account the Office for National Statistics' annual 7.3% electricity bill increases over 20 years, alongside a 2% export guarantee tariff rise with inflation. Actual savings may vary depending on property features and market conditions.