Electrical T ransmission and SEPA
Distribution Equipment Use	

United States
Environmental Protection
Agency

Subpart DD, Greenhouse Gas Reporting Program

What Must Be Monitoredfor Users of Electrical Transmission and Distribution Equipment
Insulated with Sulfur Hexafluoride (SF6) and/or Perfluorocarbons (PFCs)?

Measure or estimate these parameters annually

For use in measuring SF6 emissions using the mass-balance monitoring method (for
measuring PFCs, "PFCs" should be substituted for "SF6" in the parameters below):

~	SF6 stored in containers, but not in
energized equipment, at the
beginning of the year (pounds)

~	SF6 stored in containers, but not in
energized equipment, at the end of
the year (pounds)

~	SF6 purchased in bulk from
chemical producers or distributors
(pounds)

~	SF6 purchased from equipment
manufacturers or distributors with or
inside equipment, including
hermetically sealed-pressure
equipment (pounds)

~	SF6 returned to facility after off-site
recycling (pounds)

~	SF6 in bulk and contained in equipment
that is sold to other entities (pounds)

~	SF6 returned to suppliers (pounds)

~	SF6 sent off-site for recycling (pounds)

~	SF6 sent off-site for destruction (pounds)

~	Nameplate capacity and the number of
pieces of new equipment, hermetically
sealed-pressure switchgear (pounds)

~	Nameplate capacity and the number of
pieces of new equipment, other than
hermetically sealed-pressure switchgear
(pounds)

~	Nameplate capacity and the number of pieces
of retired hermetically sealed-pressure
equipment(pounds)

~	Nameplate capacity and the number of pieces
of retired equipment other than hermetically
sealed-pressure equipment(pounds)

Supplementary information required for data reporting requirements

~ Total nameplate capacity (pounds)
of equipment containing SF6 or
PFC s existing at the beginning of
the year (excluding hermetically
sealed-pressure equipment)

~	Transmission miles (length of lines
carrying voltages above 35 kV)

~	Distribution miles (length of lines carrying
voltages at or below 35 kV)

~	States and territories in which the facility lies

Electrical Transmission and Distribution Equipment Use Monitoring Checklist	40 CFR 98, subpart DD

Greenhouse Gas Reporting Program	February 2018

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For more information, see the information sheet for Electrical Transmission and Distribution
Equipment Use at: https://www.epa.gov/ghgreporting/electronic-transmission-and-distribution-
infosheet.

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. This information is
intended to assist reporting facilities owners in understanding key provisions of the Greenhouse
Gas Reporting Program

Electrical Transmission and Distribution Equipment Use Monitoring Checklist	40 CFR 98, subpart DD

Greenhouse Gas Reporting Program	February 2018

Page 2 of 2


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