Your guide to super efficient homes! Discover your renewable potential with just a postcode. We're here to disrupt perceptions of home heat and energy with a revolutionary map and ranking system. How does it work? Enter a postcode to discover the renewable potential of any given area. There are 4 heat and energy sources in the mix: solar, wind, hydro and ground source heat. A sort of postcode Top Trumps if you will, all battling it out for the top score of 5! So, what's your score?