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Table NN-1 to Subpart NN of Part 98—Default Factors for Calculation Methodology 1 of This Subpart

Default Factors for Calculation Methodology 1 of This Subpart

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  3. Title 40
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  5. Chapter I
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  7. Part 98
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  9. Subpart NN
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  11. Appendix Table NN-1 to Subpart NN of Part 98
CorpusDaily eCFR
Displayed edition2026-04-15
Last updated2026-04-15

Table NN-1 to Subpart NN of Part 98—Default Factors for Calculation Methodology 1 of This Subpart

FuelDefault higher heating value 1Default CO2

emission

factor

(kg CO2/MMBtu)
Natural Gas1.026 MMBtu/Mscf53.06
Propane3.84 MMBtu/bbl62.87
Normal butane4.34 MMBtu/bbl64.77
Ethane2.85 MMBtu/bbl59.60
Isobutane4.16 MMBtu/bbl64.94
Pentanes plus4.62 MMBtu/bbl70.02
1 Conditions for higher heating values presented in MMBtu/bbl are 60 °F and saturation pressure.

[78 FR 71977, Nov. 29, 2013]