Mandatory Greenhouse Gas Emissions Reporting 

This page updated June 30, 2015


Mandatory reporting logoInformation on California’s Mandatory Greenhouse Gas Reporting program.

What's New

NEW  2008-2013 GHG Emission Data Summary and Updates to Posted 2010, 2011, 2012 Data.  An evaluation of the 2013 MRR data is now available.  In addition, updated emissions data summary spreadsheets for the 2010, 2011, and 2012 data reporting years are posted to reflect minor revisions.

bullet  EPE FAQs and Updated Workbooks Posted.  ARB staff has posted updated electric power entity (EPE) Frequently Asked Questions (FAQ) and EPE Workbooks for reporting 2014 greenhouse gas emissions. EPE workbooks are also uploaded to Cal e-GGRT.

bullet Updated Guidance Documents. ARB staff has posted a series of updated guidance documents for general topics, emissions data reporting, product data reporting, and Cost of Implementation (COI) Reporting and Verification FAQs.  

bullet 2014 GHG Mandatory Reporting Regulation Effective January 1, 2015. The revisions to the Mandatory Reporting rule are approved. The Final Regulation Order and other rulemaking documents are available on the rulemaking webpage.  


Quick Links


Reporting of greenhouse gases by major sources is required by the California Global Warming Solutions Act (AB 32, 2006). The Mandatory Reporting Regulation is applicable to industrial facilities, fuel suppliers, and electricity importers. All GHG emissions data reports must comply with the regulatory requirements and be submitted via the Cal e-GGRT reporting system.

Contact Us

For questions please contact Sector Contacts,, or Patrick Gaffney, Climate Change Reporting Section, 916.322.7303