Where:
VRNG,p = The batch volume of RNG for batch pathway p, in Btu LHV.
VNG = The total volume of natural gas produced at the RNG production facility for the calendar month, in Btu LHV, as measured under § 80.155 .
VBG,p = The total volume of biogas used to produce RNG under batch pathway p for the calendar month, in Btu HHV, per § 80.105(j) .
VBG,total = The total volume of biogas used to produce RNG under all batch pathways for the calendar month, in Btu HHV, per § 80.105(j) .
R = The renewable fraction of the natural gas produced at the RNG production facility for the calendar month. For natural gas produced only from renewable feedstocks, R is equal to 1. For natural gas produced from both renewable and non-renewable feedstocks, R must be measured by a carbon-14 dating test method, per § 80.1426(f)(9) .
40 C.F.R. §80.110