Biomethane

I suspect this whole thing is made up, because there is no such thing as a “biomethane engine.”  “Biomethane” just means that the methane didn’t come from fossil fuels, but from the recent decay of organic material, e.g., plants, animal waste, etc. Similarly, there is no such thing as a “wind-energy lamp.”  The lamp on my desk doesn’t care where the electrons running through it came from.

In addition, our civilization is phasing out combustion as a means of generating electricity, because it’s inherently inefficient and dirty.

A minor exception applies to the use of noxious feedstock, and we’ve been working on this for decades.  E.g., if you have thousands of dairy or beef cows, and you’re able to collect and process that waste that would otherwise be foul-smelling and pathogenic, then, sure, let’s convert it to biomethane.  This may be feasible some day, but it isn’t now, and I expect that it will never arrive without significant government subsidies.