Guide MassDEP Greenhouse Gas Emissions Reporting Program

Facility reporting of greenhouse gas emissions provides data that helps Massachusetts develop emission reduction targets and plans, and measure progress toward its Climate Action goals.

Overview & Applicability

The Massachusetts Global Warming Solutions Act (GWSA), which became law in 2008, required the Department of Environmental Protection (MassDEP) to promulgate mandatory greenhouse gas (GHG) reporting regulations.

MassDEP responded by issuing 310 CMR 7.71, which identifies the facilities that need to report, establishes methodologies for calculating and verifying emissions, and allows voluntary reporting by facilities for which it is not mandatory.

Required to Report:
  • All facilities regulated under Title V of the federal Clean Air Act and Appendix C of 310 CMR 7.00: Air Pollution Control
  • Facilities emitting more than 5,000 tons per year of Carbon Dioxide Equivalent (CO2e)
Reportable Emissions:
  • Carbon Dioxide (CO2)
  • Methane (CH4)
  • Nitrous oxide (N2O)
  • Sulfur hexafluoride (SF6)
  • Hydrofluorocarbons (HFCs)
  • Perfluorcarbons (PFCs)

MassDEP also established special requirements for Retail Sellers of Electricity.

See Additional Resources below for related links and downloads, including a GHG Reporting Applicability Screening Tool spreadsheet that you can use to determine if your facility needs to report.

Additional Resources

General Facility Reporting

Delay in 2016 Emissions Reporting MassDEP is transitioning to a new system.

The Climate Registry Information System (CRIS) software platform, which facilities previously used for GHG emissions reporting, is no longer available.

MassDEP is combining GHG reporting with Source Registration on the eDEP Online Filing system. As noted in an email to facilities last October, the agency has deferred 2016 GHG emissions reporting until the new platform is available.

We will continue to provide facilities with updated information and instructions, including changes in reporting to accommodate the transition from CRIS to eDEP.

Additional Resources

Retail Seller of Electricity Reporting

A Retail Seller of Electricity is either:

Competitive suppliers of electricity are required to report to MassDEP annually on the GHG emissions they release from generating the power they sell. There is optional reporting for those wanting to account for ownership and/or use of generation sources.

The sector's GHG emissions are calculated by multiplying megawatt hours (MWh) supplied to customers in the previous year by GHG emission factors that MassDEP updates annually after issuing draft factors for public and stakeholder comment.

Retail Sellers need to report their GHG emissions within one month of the agency publishing final emission factors on its web site.

See Additional Resources below for a link to MassDEP calculations of emission factors.

Additional Resources

GHG Emissions Verification

The 2008 Global Warming Solutions Act (GWSA) directed MassDEP to adopt regulations requiring the “reporting and verification of statewide GHG emissions” from about 300 of the state's largest sources (those emitting more than 5,000 short tons of carbon dioxide equivalent, or CO2e, per year).

To meet the verification requirement, 310 CMR 7.71(7) requires these facilities to hire accredited third-parties to verify their GHG emissions report once every three years. Facilities completed the first triennial verification cycle in 2013, resulting in third-party verification of nearly all GHG reporters.

MassDEP has issued an Enforcement Discretion Notice suspending the requirement and is considering regulatory amendments that would end it.

Additional Resources

Annual GHG Emissions Data

Follow the link below for annual summaries of Massachusetts facility and Retail Seller of Electricity GHG emissions reporting.

Additional Resources


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