Mandatory Greenhouse Gas Emissions Reporting 

This page updated September 30, 2016


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

What's New

bullet  Proposed Mandatory Reporting Regulation (MRR) and Staff Report Available. On September 22, 2016, the Air Resources Board conducted a public hearing to consider proposed amendments to MRR.  The regulatory documents are available here.  (Updated 9/30/2016)

bullet  Previous Workshop for Amendments to Mandatory Reporting and Cap-and-Trade Regulations. On February 24, 2016, ARB staff held a workshop to discuss potential revisions to the GHG Mandatory Reporting and Cap-and-Trade Regulations. Workshop Materials and Comments.  (Updated 2/29/2016)

bullet  Updated Facility and Supplier Guidance Documents. ARB has posted revised guidance documents for facility operators and suppliers. Additional documents related to cessation, applicability, and EPE reporting will be posted in April of 2016. (Updated 4/7/2016)


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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