Last reviewed on 06-22-2018

Documentation of California's Greenhouse Gas Inventory (11th Edition - Last updated on 11-06-2019)

♦ Category: Energy

IPCC: 1A4a - Fuel Combustion Activities - Other Sectors - Commercial/Institutional
Sector: Commercial : Communication : Telephone & Cell Phone Services

♦ Activity: Fuel combustion - Natural gas

♦ Greenhouse gas: Methane ( CH4 )

► Year 2010 —

● Greenhouse gas emission estimate —

Amount: 0.215 tonne of CH4 Emitted (5.36 tonnes CO2 Eq.)
Basis: Calculation
Calculation: [Fuel combustion] * [Heat content] * [Fuel CH4 emission]
Reference: IPCC (2006). 2006 IPCC Guidelines for National Greenhouse Gas Inventories, Prepared by the National Greenhouse Gas Inventories Programme, Eggleston H.S., Buendia L., Miwa K., Ngara T., and Tanabe K. (eds). Volume 2, Chapter 2: Stationary Combustion. Published: IGES, Japan. ttp://

● Activity level used in calculations —

Activity: Fuel combustion = 210,081,976 scf of Natural gas
Basis: Data
Reference: Nguyen, C. (2019). Data request (data from the CEC's Quarterly Fuels and Energy Report) between CARB and Cam-Giang Nguyen of the California Energy Commission. February 2019.

● Parameters and Constants used in calculations —

Parameter: Fuel CH4 emission = 1.000E-06 g / btu
Reference: ARB Mandatory Reporting of Greenhouse Gas Regulation. Subpart C of 40 CFR Part 98 (98.30 to 98.38). Available online at: ttps://
Parameter: Heat content = 1,022 btu / scf
Reference: EIA (2019). Energy Information Administration. State Energy Consumption, Price, and Expenditure Estimates (SEDS). Available online at: ttps://
Constant: Global warming potential of CH4 = 25
Reference: IPCC (2007). Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Solomon S., Qin D., Manning M., Chen Z., Marquis M., Averyt K.B., Tignor M., and Miller H.L. (eds.).

● Greenhouse gas emitted per unit activity (derived from values listed above) —

Amount: 1.022E-03 g of CH4 per scf of Natural gas
0.0255 g of CO2eq. per scf of Natural gas