The installation of anaerobic digesters and the commercial-scale production of biogas in the US emerged in the late 1970s and until 2007 the biogas produced by these projects was exclusively used to generate electricity and/or heat. The 2005-2010 period witnessed the introduction of biogas-to-RNG facilities, meaning the raw biogas is upgraded to pipeline-quality renewable natural gas (RNG). By 2010, RNG projects represented 10% of projects; by 2018 it climbed to 14%.

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