Leeds City Council is committed to an ambition to achieve 100% clean energy in the city by 2050. The council recognises that reducing the carbon footprint of heat is one of the biggest challenges it faces, and is working with Northern Gas Networks (NGN) to develop the H21 project which will make Leeds the first city in the UK to run on hydrogen instead of natural gas. NGN have secured £10m from OFGEM and are now demonstrating the safety case of using 100% hydrogen in the gas network, while working closely with Leeds City Council to identify demolished or derelict sites where mains networks still exist in order to provide a safe, ‘real-life’ test environment with no customer impact. H21 is a hugely ambitious and innovative project which could play a major role in enabling the UK to meet its Climate Change Act targets. For Leeds, the long term prize is an estimated £7m per year in economic value generated by the jobs created or supported directly as a result of the project, together with an 11% reduction in regional carbon emissions.