Home Energy Index

What's worth doing to your home?

Solar, batteries, heat pumps and tariffs, costed for your address and ranked by what you'd save.

  • Solar output from the MCS method installers use
  • Today's Ofgem price cap and Octopus tariffs for your region
  • Installed prices from government statistics
  • Prices updated 15 November 2026. See every source
Type of home
How do you heat your home?
Your heating use (optional)From your bills. Leave blank and we'll estimate it.
More details

How it works

  1. Your home

    Postcode, type of home and how you heat it. Your energy certificate fills in the rest if you have one.

  2. Every combination

    We model a typical year half-hour by half-hour, with and without each upgrade, on every tariff you could switch to.

  3. Ranked by saving

    Cost after grants, saving a year and payback for each option, best first.