Last reviewed on 12-01-2023

Documentation of California's Greenhouse Gas Inventory (2023 Edition - Last updated on 12-1-2023)

♦ Category: Energy

IPCC: 1A2h - Fuel Combustion Activities - Manufacturing Industries and Construction - Machinery
Sector: Industrial : Manufacturing : Electric & Electronic Equip.

♦ Activity: Fuel combustion - Natural gas

♦ Greenhouse gas: Carbon dioxide ( CO2 )

► Year 2000 —

● Greenhouse gas emission estimate —

Amount: 105,863 tonnes of CO2 Emitted (105,863 tonnes CO2 Eq.)
Basis: Calculation
Calculation: [Fuel combustion] * [Heat content] * [Fuel CO2 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.

● Activity level used in calculations —

Activity: Fuel combustion = 2,087,839,947 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: CO2 emission factor = 0.053 g / btu
Reference: CARB Mandatory Reporting of Greenhouse Gas Regulation. Subpart C of 40 CFR Part 98 (98.30 to 98.38). Available online at:
Parameter: Heat content = 956 btu / scf
Reference: EIA (2021). Energy Information Administration. State Energy Consumption, Price, and Expenditure Estimates (SEDS). Available online at:

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

Amount: 50.7 g of CO2 per scf of Natural gas