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Bio-substitute natural gas (or BioSNG) produced from gasification of waste fuels and subsequent methanation of the product gas could play a crucial role in the decarbonisation of heating and transportation, and could be a vital part of the energy mix in the coming decades. The BioSNG demonstration plant described in this paper seeks to prove the technical feasibility of the thermal gasification of waste to renewable gas, through a preliminary experimental programme to take an existing stream of syngas, methanate it and show that it can be upgraded to gas grid quality requirements. The syngas used in the project is a waste-derived syngas from a twostage fluidised bed-plasma pilot facility, which is then converted and upgraded in a new, dedicated conversion and clean up plant. Extensive trials were undertaken on methanation and gas upgrading units for over 60 hours of continuous operation. The fundamentals of a once-through methanation process train have been established on the demonstration facility and a model built to extend the analysis over different operational parameters. Over the trials, methane outputs of greater than 50kWth

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