Subpart DD – Use of Electric Transmission and Distribution Equipment
This page provides resources for subpart DD reporters, including implementation information as well as supporting documents for relevant rulemakings.
Summary
The electrical transmission and distribution equipment use source category consists of all electric transmission and distribution equipment and servicing inventory insulated with or containing sulfur hexafluoride (SF6) or perfluorocarbons (PFCs) used within an electric power system. This equipment includes but is not limited to gas-insulated substations; circuit breakers; switchgear, including closed-pressure and hermetically sealed-pressure switchgear; gas-insulated lines containing SF6 or PFCs; gas containers such as pressurized cylinders; gas carts; electric power transformers; and other containers of SF6 or PFC.
For the purposes of this subpart, facility is defined as the electric power system, comprising all electric transmission and distribution equipment insulated with or containing SF6 or PFCs that is linked through electric power transmission or distribution lines and functions as an integrated unit, that is owned, serviced, or maintained by a single electric power transmission or distribution entity (or multiple entities with a common owner), and that is located between (1) the point(s) at which electric energy is obtained by the facility from an electricity generating unit or a different electric power transmission or distribution entity that does not have a common owner, and (2) the point(s) at which the customer or another electric power transmission or distribution entity that does not have a common owner receives the electric energy. The facility also includes servicing inventory for such equipment that contains SF6 or PFCs. For reporting purposes, equipment that contains SF6 or PFCs excludes hermetically sealed-pressure equipment.
Reporter Resources
Subpart DD Regulatory History
| Federal Register Date | Citation | Action | Description | First reporting year impacted |
|---|---|---|---|---|
| 4/25/2024 | 89 FR 31802 | Final Rule |
Updates global warming potentials (GWPs), expands the GHGRP to new source categories, and revises the requirements for certain sectors to improve the data collected and program implementation. |
2024 (updated GWPs for existing reporters) 2025 (all other changes) |
| 12/09/2016 | 81 FR 89188 | Final Rule | Revises 29 subparts to streamline implementation, improve data quality, provide flexibility, and clarify the rule. Establishes confidentiality determinations for new or substantially revised data elements. Final action in response to a Petition for Reconsideration. Final Preamble and Rule (12/2016) (pdf) (87 pp, 801K) Response to Comments (12/2016) Final Rule Fact Sheet (12/2016) (pdf) (210 KB) Memo: Table of Final 2015 Revisions to the Greenhouse Gas Reporting Rule Proposed Preamble and Rule (1/15/2016) (pdf) (91 pp, 890K) |
2017 |
| 12/11/2014 | 79 FR 73750 | Final Rule | Adds chemical-specific and default global warming potentials (GWPs) for fluorinated greenhouse gases (F-GHGs) and fluorinated heat transfer fluids (F-HTFs) to the general provisions of the Greenhouse Gas Reporting Rule, makes conforming changes to subpart I (Electronics Manufacturing) and subpart L (Fluorinated Gas Production), amends certain provisions of subpart L, and establishes confidentiality determinations for certain reporting requirements of subpart L. Correction Notice (12/2014) (pdf) (1 p, 230K) Final Preamble and Rule (11/2014) (pdf) (48 pp, 796K) Response to Comments (12/2014) Fact Sheet (12/2014) (pdf) (45 KB) Proposed Preamble and Rule (1/10/2012) (pdf) (19 pp, 222K) Proposed Preamble and Rule (9/11/2013) (pdf) (31 pp, 550K) Proposed Rule (11/19/2013) (pdf) (24 pp, 400K) Proposed Preamble and Rule (7/31/2014) (pdf) (21 pp, 370K) Notice of Data Availability (pdf) (6 pp, 251K) |
2014 |
| 11/29/2013 | 78 FR 71904 | Final Rule | Updates global warming potentials (GWPs) to reflect IPCC AR4 values, and amends 27 subparts to improve and clarify reporting requirements. Establishes confidentiality determinations for new and revised data elements. Final Preamble and Rule (11/2013) (pdf) (79 pp, 935K) Correction Notice (11/2013) (pdf) (2 pp, 248K) Response to Comments (11/2013) Fact Sheet (11/2013) (pdf) (37.6 KB) Memo: Table of Final 2013 Revisions to the Greenhouse Gas Reporting Rule (pdf) (1 MB) Proposed Preamble and Rule (4/2/2013) (pdf) (77 pp, 909K) |
2014 |
| 08/13/2012 | 77 FR 48072 | Final Rule | Establishes confidentiality determinations for most data elements to be reported under subparts I, W, DD, FF, II, QQ, RR, SS, TT, and UU; defers the deadline for reporting certain recently added data elements that are inputs to emission equations in subparts W, FF, and TT; finalizes amendments to subpart I to remove the requirement for a facility using Best Available Monitoring Methods (BAMM) to recalculate the previous reporting years’ emissions and resubmit to EPA. Final Preamble and Rule (8/2012) (pdf) (88 pp, 287K) Response to Comments (8/2012) Fact Sheet (8/2012) (pdf) (44 KB) Proposed Preamble and Rule (1/10/2012) (pdf) (19 pp, 230K) Proposed Preamble and Rule (2/22/2012) (pdf) (17 pp, 212K) Proposed Preamble and Rule (2/24/2012) (pdf) (23 pp, 261K) More Information on 8/2012 Final Rule |
2011 |
| 11/29/2011 | 76 FR 73866 | Final Rule | Amends subparts A, W, FF, II, OO, RR, and TT to clarify reporting requirements and correct technical and editorial errors. Final Preamble and Rule (11/2011) (pdf) (25 pp, 341K) Response to Comments (11/2011) Fact Sheet (11/2011) (pdf) (48 KB) Proposed Preamble and Rule (8/4/2011) (pdf) (30 pp, 427K) More Information on Technical Corrections |
2011 |
| 12/01/2010 | 75 FR 74774 | Final Rule | Adds subparts I, L, DD, QQ, and SS, which are sources of fluorinated GHGs, to 40 CFR Part 98. Final Preamble and Rule (12/2010) (pdf) (89 pp, 1MB) Response to Comments (12/2010) Proposed Preamble and Rule (4/12/2010) (pdf) (72 pp, 546K) Proposed Rule (4/10/2009) (pdf) (3.0 MB) Proposed Preamble (4/10/2009) (pdf) (3.7 MB) Fact Sheet (12/2010) (pdf) (41 KB) Technical Support Document: Emissions from Electric Power Equipment Use (pdf) (110 KB) Economic Impact Assessment (pdf) (477 KB) More Information on Subparts I, L, QQ, SS |
2011 |