40 CFR Part 98, Table NN-1
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
| Fuel | Default higher heating value 1 | Default CO2emissionfactor(kg CO2/MMBtu) |
|---|---|---|
| Natural Gas | 1.026 MMBtu/Mscf | 53.06 |
| Propane | 3.84 MMBtu/bbl | 62.87 |
| Normal butane | 4.34 MMBtu/bbl | 64.77 |
| Ethane | 2.85 MMBtu/bbl | 59.6 |
| Isobutane | 4.16 MMBtu/bbl | 64.94 |
| Pentanes plus | 4.62 MMBtu/bbl | 70.02 |
1 Conditions for higher heating values presented in MMBtu/bbl are 60 °F and saturation pressure.
[78 FR 71977, Nov. 29, 2013]