Last reviewed on 06-22-2018

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

♦ Category: Industrial Processes and Product Use

IPCC: 2H3 - Other - Hydrogen Production
Sector: Industrial : Petroleum Refining and Hydrogen Production : Transformation

♦ Activity: Fuel consumption - Natural gas

♦ Greenhouse gas: Carbon dioxide ( CO2 )

► Year 2012 —

● Greenhouse gas emission estimate —

Amount: 1,931,155 tonnes of CO2 Emitted (1,931,155 tonnes CO2 Eq.)
Basis: Calculation
Calculation: [Fuel consumption] * [Heat content] * (1 - [Proportion of carbon stored]) * [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. ttp://

● Activity level used in calculations —

Activity: Fuel consumption = 35,699,840,921 scf of Natural gas
Basis: Data
Reference: ARB (2019). Summary of 2008 to 2017 data from California's Greenhouse Gas Mandatory Reporting Program. Reported emissions are available at:

● Parameters and Constants used in calculations —

Parameter: Fuel CO2 emission = 0.053 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 = 1,020 btu / scf
Reference: EIA (2019). Energy Information Administration. State Energy Consumption, Price, and Expenditure Estimates (SEDS). Available online at: ttps://
Parameter: Proportion of carbon stored = 0
Reference: ARB (2016). Technical support document on GHG inventory methodologies for the 2000-2014 inventory. See Discussion of emissions from hydrogen production available at: ttps://

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

Amount: 54.1 g of CO2 per scf of Natural gas