Watford, csg gas is mainly CH4 but concentration can vary and other gases which are sometimes ok (ie still good or better as a fuel) and impurities and moisture and CO2 (which are no good as a fuel) are also in the mix. There are ways to process basically anything up to a usable fuel but I presume there is a cut off wrt cost where it is not worth the effort. Adding propane like in the article - I didn't see that happening when I had a quick look at csg but it makes sense if they need to increase the quality. The bit about explosive trucks? What's the difference between a gas tanker and a petrol tanker?
DTE Price at posting:
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