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Mandatory GHG Reporting - Reported Emissions

This page updated November 4, 2013

GHG Emissions Data

Revisions to the Regulation for the Mandatory Reporting of Greenhouse Gas Emissions, approved in 2010, went into effect on January 1, 2012. Data collection under the reporting regulation began with 2011 data reported in 2012. The links below provide a summary of 2011 and 2012 GHG data reported under the Mandatory Reporting regulation, 2008-2010 historical data, and spreadsheets providing emissions and other data for individual reporting facilities, electric power entities, and fuel suppliers.

New Banner 2012 Data Reported by Facilities, Suppliers, and Electric Power Entities

  "Updated" marker  2011 Data Reported by Facilities, Suppliers, and Electric Power Entities


The 2012 regulatory revisions included changes in methodologies to harmonize with the U.S. EPA reporting regulation, the addition of new reporting sectors, collection of additional data to support the ARB cap-and-trade program, and other updates. Where possible, existing reporting entity identification information was retained for 2011 and forward reporting, but in some cases, facilities were consolidated or divided to comply with the new requirements. When comparing 2011 and forward data with historical 2008-2010 data, there will be differences in the facilities listed, as well as the emissions and other data due to changes in methods and applicability.

Historical Emissions Data for 2008 through 2010

Data are provided below for the reporting years 2008 through 2010. After that time, ARB revised the GHG reporting regulation to support the cap-and-trade program and to harmonize with the U.S. EPA greenhouse gas reporting program.

  • GHG Data Visualization Tool - View 2008, 2009, and 2010 facility data and reported greenhouse gas emissions using Google Maps and Google Earth.

Overview - Historical Data for 2008 through 2010

Under California’s mandatory Greenhouse Gas Reporting Program, California's largest industrial facilities reported their greenhouse gas (GHG) emissions for years 2008, 2009 and 2010. Facility operators certified their 2008 emissions data reports were complete and accurate. Emissions data reports for 2009 and 2010 were certified by operators and also verified by third-party verifiers accredited by the Air Resources Board. Electricity retail providers and marketers reported electricity transaction data for 2008, 2009 and 2010. Transaction reports for 2009 and 2010 were also verified by third party verifiers. The summaries of reported GHG emissions and electricity transaction data are available at the links above.

The 2010, 2009 and 2008 GHG emissions reports include data from the following industrial sectors: cement plants, oil refineries, hydrogen plants, electricity generating facilities, cogeneration facilities, other large stationary combustion sources, and electricity retail providers and marketers. Only sources that met specified emission thresholds were subject to reporting under the regulation. Oil refineries, hydrogen plants, and large stationary combustion facilities emitting ≥ 25,000 metric tons (MT) of CO2 per year were subject to reporting. The threshold for electricity generating and cogeneration facilities was ≥1megawatt generating capacity and ≥2,500 MT CO2 per year.



For general questions regarding Mandatory Greenhouse Gas Emissions Reporting, contact:
Patrick Gaffney, Climate Change Reporting Section, 916.322.7303


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