California Air Resources Board

Reporting of greenhouse gas (GHG) emissions by major sources is required by the California Global Warming Solutions Act of 2006 (AB 32). The Regulation for the Mandatory Reporting of Greenhouse Gas Emissions (MRR) is applicable to electricity generators, industrial facilities, fuel suppliers, and electricity importers. A summary of reported GHG emissions data reported under MRR are made public each year, and the data used by the Cap-and-Trade Program and included in California Greenhouse Gas Inventory.

All GHG emissions data reports must comply with the regulatory requirements and be submitted via the Cal e-GGRT reporting system. Reporting guidance documents and training materials are provided to clarify rule applicability and assist reporters in complying with the Regulation.

The California Air Resources Board implements and oversees a third-party verification program to support mandatory GHG reporting. All GHG reports subject to the Cap-and-Trade Program must be independently verified by CARB-accredited verification bodies and verifiers.