The following Massachusetts facilities must report:

  • All facilities that are regulated under Title V of the U.S. Clean Air Act and 310 CMR 7.00, Appendix C
  • Facilities that emit more than 5,000 tons per year of Carbon Dioxide Equivalent (CO2e)

These facilities must report the following types of greenhouse gases:

  • Starting with the report due on April 15, 2010, carbon dioxide (CO2) emissions in the previous year had to be reported (i.e., starting with 2009 emissions).
  • Starting with reports due on April 15, 2011 (and continuing with reports in each year thereafter), emissions in the previous year (i.e., starting with 2010 emissions) of other specific greenhouse gases had to be reported. The additional gases are:
    • Methane (CH4)
    • Nitrous oxide (N2O)
    • Sulfur hexafluoride (SF6)
    • Hydrofluorocarbons (HFCs)
    • Perfluorcarbons (PFCs)

Special requirements for retail sellers of electricity:

  • Each year, the Department of Environmental Protection (MassDEP) drafts GHG emission factors. Interested parties are given the opportunity to comment on the methodology, data sources and calculations before the agency adopts final emissions factors for a specific reporting year.
  • Retail sellers of electricity must report their GHG emissions to MassDEP one month after the final emissions factors have been posted on the agency's web site.
  • GHG emissions for this sector are calculated by multiplying the annual emission factor by the number of megawatt hours (MWh) the retail sellers provided to their customers in the previous year.

For additional information, see Massachusetts Greenhouse Gas Emissions Reporting Program or contact Will Space of MassDEP (