Mandatory Greenhouse Gas Emissions Reporting 

This page updated May 31, 2016


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

What's New

NEW  REGULATORY ADVISORY FOR REPORTING 2015 DATA.  The California Air Resources Board (ARB) is granting an 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 is being provided because of an unforeseen technical issue with Cal e-GGRT which disabled the reporting system for a period of time beginning on the morning of May 27, 2016. Cal e-GGRT is currently fully operable and the technical issues have been remedied.  See the full Regulatory Advisory for additional information. (Added 5/31/2016) 

NEW  Revised EPE Workbooks and Guidance.  The Excel reporting workbooks for Electric Power Entities (EPE) have been posted (Workbooks 1, 2, 3, 4) for reporting 2015 data. In addition, staff has posted updated EPE guidance documents. The EPE reporting deadline is June 1, 2016. (Added 4/14/2016) 

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)

bullet  EPE - Asset Controlling Supplier (ACS) System Emission Factors for Calendar Year 2016.  The ACS emissions factors are now available. (Added 12/11/2015)


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