Mandatory Greenhouse Gas Emissions Reporting 

This page updated July 22, 2016


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

What's New

NEW  Proposed Mandatory Reporting Regulation (MRR) and Staff Report Available. On September 22, 2016, the Air Resources Board will conduct a public hearing to consider proposed amendments to MRR.  The regulatory documents are available here.  (Added 7/22/2016)

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  Regulatory Advisory for Reporting 2015 Data.  The ARB granted a reporting deadline extension to June 8, 2016, for electric power entities and abbreviated reporters that did not complete the submission and certification of their GHG emissions data report prior to May 27, 2016. The extension was provided because of a technical issue with Cal e-GGRT which temporarily disabled the reporting system.  See the Regulatory Advisory for additional information. (Added 5/31/2016) 

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)


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