Last reviewed on 06-22-2018

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

♦ Category: Energy

IPCC: 1A1aii - Fuel Combustion Activities - Energy Industries - Main Activity Electricity and Heat Production - Combined Heat and Power Generation (CHP)
Sector: Electricity Generation (In State) : CHP: Commercial

♦ Activity: Fuel combustion - Natural gas

♦ Greenhouse gas: Methane ( CH4 )

► Year 2011 —

● Greenhouse gas emission estimate —

Amount: 14.21 tonnes of CH4 Emitted (355.32 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 = 13,918,343,569 scf of Natural gas
Basis: Data
Reference: ARB (2016). Technical support document on GHG inventory methodologies for the 2000-2014 inventory. See Discussion of emissions from electricity and combined heat and power generation available at: ttps://

● 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: 1.021E-03 g of CH4 per scf of Natural gas
0.0255 g of CO2eq. per scf of Natural gas