Free tools · UK
UK home energy calculators
Built on official UK figures: the Ofgem price cap, DESNZ regional solar installation costs, weekly pump prices, and the 0% VAT and Electric Car Grant rules in force now.
Calculators
- UKSolar panel calculatorSavings, export income and payback by region, using DESNZ installed costs and the Ofgem cap.Open calculator →
- UKHeat pump running cost calculatorHeat pump vs gas boiler at the price cap, the SPF you need to save, and payback after the £7,500 grant.Open calculator →
- UKEV vs petrol cost calculatorCost per mile at the price cap and this week's pump price, with your home and public charging mix.Open calculator →
What applies in 2026
There is no up-front grant for typical solar buyers, but VAT is 0% until March 2027, and new EVs under £37,000 can get the Electric Car Grant.
Current rules
- VAT on solar panels and batteries
- 0% on installation in homes in Great Britain from 1 May 2023 to 31 March 2027 (batteries, including retrofitted and standalone, from 1 February 2024); 5% from 1 April 2027HMRC VAT Notice 708/6, Energy-saving materials and heating equipment · checked Oct 27, 2026
- Electric Car Grant
- £3,750 or £1,500 off new electric cars priced at or under £37,000, depending on the car's production emissions; available from 16 July 2025 and extended to 2030GOV.UK, Electric Car Grant launch (July 2025) and December 2025 extension · checked Oct 27, 2026
Each calculator lists its defaults with a source and a check date. Change any input to match your bill, tariff or quote.