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.

Table of Contents

News & Updates

November 2022

MassDEP finalized amendments to 310 CMR 7.71: Greenhouse Gas Reporting and 310 CMR 7.75: Clean Energy Standard.

These regulatory changes improve consistency with federal requirements, reflect the GHG reporting program's transition to a new electronic platform, and remove requirements that are burdensome to facilities.

They also add a reporting option for municipally owned electricity sellers and clarify MassDEP authority to require that certain reports be submitted directly to the Massachusetts Department of Energy Resources.

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 short 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 for Overview & Applicability

Facility Reporting

GHG reporting is combined with Source Registration on the eDEP Online Filing system and web forms are now available.

Follow the link in Key Actions below to learn more.

Key Actions for Facility Reporting

Retail Seller of Electricity Reporting

A Retail Seller of Electricity is:

All retail sellers are required to annually report GHG emissions they release from generating the power they sell. There is also an optional report for those that choose to account for ownership and/or use of certain generation sources.

Each retail seller's GHG emissions are calculated by multiplying megawatt hours (MWh) supplied to customers in a particular year by GHG emission factors that MassDEP updates annually after issuing draft factors for public and stakeholder comment.

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

Key Actions for Retail Seller of Electricity Reporting

Additional Resources for Retail Seller of Electricity Reporting

Annual GHG Emissions Data

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

Additional Resources for Annual GHG Emissions Data

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