hard to electrify, such as freight and some industrial processes, combined with doubts over the scale of sustainable global biomass supply, it would be high risk to assume that large-scale biomethane injection into the grid is a viable option. The gasification process or anaerobic digestion of UK-sourced waste(s) or biomass could only meet a small proportion of UK demand, with gas consumption in buildings currently running at close to 500 TWh a year. Relying on imports would leave the UK exposed to international bioenergy prices that may rise substantially. Heat networks, where heat is generated remotely and supplied to buildings, offer a more promising option.  an additional 56.5 TWh of low carbon heat by 2020 (of which, 30.5 TWh will be delivered to buildings - up to 112,000 low carbon heat installations), saving 43 MtCO,e overall (of which over half is from buildings) over the period 2011-20; and  11% of our heat coming from new and diversified renewable sources, as part of an overall ambition to achieve 12% by 2020. 2.66 The quality of installations and the supply chain to support low carbon heat need to be first class to ensure consumer confidence. The Government is requiring all RHI installations (up to and including 45 kWh) be installed by an accredited Microgeneration Certification Scheme installer.