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Renewable natural gas , also known as sustainable natural gas or biomethane, is a biogas which has been upgraded to a quality similar to fossil natural gas and having a methane concentration of 90% or greater. By increasing the concentration of methane to a similar level as natural gas, it becomes possible to distribute the gas to customers via the existing gas grid and use in existing appliances. Renewable natural gas is a subset of synthetic natural gas or substitute natural gas.
Multiple ways of methanising carbon dioxide/monoxide and hydrogen exist, including biomethanation, the Sabatier process and a new electrochemical process pioneered in the United States currently undergoing trials.
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