I think this entire factor is made up, as a result of there isn’t any such factor as a “biomethane engine.” “Biomethane” simply signifies that the methane didn’t come from fossil fuels, however from the current decay of natural materials, e.g., vegetation, animal waste, and many others. Equally, there isn’t any such factor as a “wind-energy lamp.” The lamp on my desk doesn’t care the place the electrons working via it got here from.
As well as, our civilization is phasing out combustion and a method of producing electrical energy, as a result of it’s inherently inefficient and soiled.
A minor exception applies to using noxious feedstock, and we’ve been engaged on this for many years. E.g., when you have 1000’s of dairy or beef cows, and also you’re in a position to accumulate and course of that waste that might in any other case be foul-smelling and pathogenic, then, certain, let’s convert it to biomethane. This can be possible some day, nevertheless it isn’t now, and I count on that it’ll by no means arrive with out vital authorities subsidies.
