Electricity Generation
United States
Final Rule: Mandatory Reporting of Greenhouse Gases
Under the Mandatory Reporting of Greenhouse Gases (GHGs) rule, owners or operators of facilities that
contain electricity-generating units (as defined below) must report emissions from electricity-generating
units and all other source categories located at the facility for which methods are defined in the rule.
Owners or operators are required to collect emission data; calculate GHG emissions; and follow the
specified procedures for quality assurance, missing data, recordkeeping, and reporting.
How Is This Source Category Defined?
This source category consists of:
• Electricity-generating units that are subject to the requirements of the Acid Rain Program.
• Electricity-generating units that are required to monitor and report to EPA carbon dioxide (CO2)
emissions year-round according to 40 CFR part 75 .
This source category excludes portable equipment or emergency generators, as defined in 40 CFR 98.6.
What GHGs Must Be Reported?
Facilities must report the following:
• Report annual mass emissions of CO2, nitrous oxide (N2O), and methane (CFL^ emissions for
each electricity-generating unit.
• For each electricity-generating unit that is not part of this category and for stationary fuel
combustion units that do not generate electricity, report under subpart C (General Stationary Fuel
Combustion Sources) annual emissions of CO2, N2O, and CFi4 by following the requirements of
subpart C.
How Should GHG Emissions Be Calculated?
Facilities must calculate GHG emissions as follows:
• Monitor and report CO2 mass emissions according to the applicable requirements of 40 CFR 75.
Convert cumulative CO2 mass emissions reported in the fourth quarter from short tons to metric
tons.
• Calculate N2O and CFi4 emissions by using the cumulative annual heat input to the unit, derived
from the electronic data reports under part 75, and emission factors provided in 40 CFR part 98,
subpart C (General Stationary Fuel Combustion Sources).
What Information Must Be Reported?
In addition to the information required by the General Provisions at 40 CFR 98.3(c), report the
information specified in 40 CFR 98.36 (b) of subpart C (General Stationary Fuel Combustion Sources)
for each electricity-generating unit.
40 CFR 98, subpart D EPA-430-F-09-045R
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For More Information
This document is provided solely for informational purposes. It does not provide legal advice, have
legally binding effect, or expressly or implicitly create, expand, or limit any legal rights, obligations,
responsibilities, expectations, or benefits in regard to any person. The series of information sheets is
intended to assist reporting facilities/owners in understanding key provisions of the final rule.
Visit EPA's Web site (www.epa.gov/climatechange/emissions/ghgrulemaking.html') for more
information, including the final preamble and rule, additional information sheets on specific industries,
the schedule for training sessions, and other documents and tools. For questions that cannot be answered
through the Web site, please contact us at: ghgmrrigiepa.gov.
40 CFR 98, subpart D EPA-430-F-09-045R
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