Find out how much you could save with renewable energy
Personalised estimates for solar panels and air source heat pumps, based on real Ofgem pricing data. Results in under 60 seconds.
Choose your calculator
Select the technology you're interested in for a personalised savings estimate.
Solar Panel Calculator
Estimate system size, installation cost, annual savings, and payback period for your property.
- Personalised to your property & location
- Includes battery storage options
- Smart Export Guarantee income
- 0% VAT on residential installations
Heat Pump Calculator
Compare running costs, see your savings after the BUS grant, and find the right system size.
- Compares costs vs gas, oil, LPG & electric
- Includes the £7,500 BUS grant
- Accurate sizing for your property
- 0% VAT on heat pump installations
How it works
Three simple steps to your personalised savings estimate
Answer a few questions
Tell us about your property, location, and energy usage. Takes less than 60 seconds.
Get instant results
Our calculator gives you personalised estimates using current Ofgem pricing and regional data.
Connect with installers
Optionally get free, no-obligation quotes from up to 3 MCS-certified installers in your area.
Built on real data
Our calculations use official UK government data sources, not marketing estimates.
Ofgem Price Cap
Electricity and gas rates from the current Ofgem price cap, updated quarterly.
Q2 2026 ratesDESNZ Carbon Data
Grid carbon intensity from the Department for Energy Security & Net Zero.
2025 factorsMCS Standards
System sizing and performance data aligned with MCS certification requirements.
Industry standardRegional Solar Yield
Location-specific solar generation data from Energy Saving Trust research.
11 UK regionsFrequently asked questions
Our calculators use the latest Ofgem energy prices, regional solar yield data, and current government incentive information. Results are indicative estimates — a qualified installer will provide a precise quote based on a detailed survey of your property.
Yes, completely free. Our calculators cost nothing to use and there is no obligation to proceed with any quotes you receive.
The BUS grant provides £7,500 towards the cost of an air source heat pump installation. It is available to homeowners in England and Wales and is deducted from your installation cost at the point of sale. Your installer must be MCS-certified.
Yes. Since 2022, the UK government has applied 0% VAT on the supply and installation of solar panels, heat pumps, and other energy-saving materials for residential properties. This is currently in effect until March 2027.
If you consent to being contacted, we will connect you with up to 3 MCS-certified installers in your area who will provide free, no-obligation quotes. You are never under any pressure to proceed.
Your data is handled in full compliance with UK GDPR. We only share your details with installers if you explicitly consent. You can withdraw consent at any time. See our Privacy Policy for full details.
Ready to see your savings?
It's free, takes 60 seconds, and there's zero obligation.