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Mandatory GHG Reporting 
Guidance Documents

This page updated May 8, 2014


These guidance documents are provided solely for informational purposes to assist reporters in meeting the requirements of the Regulation for the Mandatory Reporting of Greenhouse Gas Emissions (MRR). Please read the Legal Disclaimer for Guidance Documentation as it pertains to the posted documents. Additional information is available at the GHG reporting home page.


Applicability, Cessation, Change of Owner

General Reporting Guidance

  • Best Available Data: Annotated version of section 95103(h) indicating which information may be reported using "best available" data for 2013. (new in 2014)
  • Annual Changes in GHG Data: Reporting year-to-year increases or decreases in GHG emissions, required by section 95104(f).  (new in 2014)
  • Unit Aggregation: Requirements for unit aggregation when reporting stationary combustion sources and how to enter unit data into the Cal e-GGRT system. (updated in 2014)
  • Meter Calibration and Accuracy: Requirements for measurement accuracy, calibration, field accuracy, and other information. (updated in 2014)
  • Biomass-Derived Fuels: Biomass fuel reporting and verification requirements, including woody-biomass and exempt biomethane. (new in 2014)
  • Minimum Allowable Tiers (Methods) Under Section 95115: Which emission estimation tiers may be used for estimating emissions from stationary fuel combustion. (2012)
  • Missing Data Substitution Provisions: Requirements and guidance for using alternate data when primary required data are not available. (updated in 2014)

Sector Guidance

Product Data Reporting Guidance

Petroleum and Natural Gas Systems

Electric Power Entities

For questions please contact:
   Sector Specialist Contacts List 
   GHG Reporting Help Desk:
   or Patrick Gaffney, Climate Change Program Data Section, 916.322.7303