The EIA has begun tracking heat content of end-use natural gas, providing state-to-state comparisons of natural gas consumption. Gas in states with heavy ethane rejection generates more British Thermal Units (Btus) per cubic foot than states whose gas content is closer to pure methane.

High-Btu natural gas contains higher concentrations of natural gas liquids (mostly ethane and some propane) that have higher heat content than methane. Pure ethane has a heat content of 1,770 Btu/cf and pure propane 2,516 Btu/cf, according to the EIA’s data. I...


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