Substitute natural gas
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Substitute natural gas, or SNG, can be produced from fossil fuels e.g. lignite coal or from biofuels and is then namned Bio-SNG.
In Great Plains, USA, approx 15 TWh/year SNG from lignite coal is injected into the national gas grid. The production process of SNG at the Great Plains plant involves gasification, gas cleaning, shift and methanation.
[edit] Distribution
It's advantageous to distribute SNG and bio-SNG together with natural gas in a gas grid. In that way the production of renewable gas can be phased in at the same rate as the production capacity is increased. The gas market and infrastructure the natural gas has contributed with is a condition for large scale introduction of renewable biomethane produced through anaerobic digestion (biogas) or gasification and methanation Bio-SNG.
