Biogas pipelines to transport biogas from smaller digesters to a scale RNG upgradation facility - a recent report ( https://bit.ly/2UhLPN3 ) from a California RNG firm putting up the pipelines suggests an important question - which is better? Trying to develop small scale biogas upgrading units so RNG can be produced (and perhaps also used) at site or making use of economies of scale and setting up large RNG upgrading plants to which the biogas is transported or piped to?