Subpart D – Electricity Generation

This page provides resources for subpart D reporters, including implementation information as well as supporting documents for relevant rulemakings.

Summary

Subpart D source category consists of electricity-generating units that are subject to the requirements of the Acid Rain Program and 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.

Reporter Resources

Subpart D Regulatory History

40 CFR Part 98.40
Federal Register Date Citation Action Description First reporting year impacted
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 (11/29/2013) (pdf) (79 pp, 812 KB)
Correction Notice (01/22/2014) (pdf) (2 pp, 248 KB)
Response to Comments (11/22/2013)
Fact Sheet: 2013 Revisions and Confidentiality Determinations (pdf) (37.58 KB, Nov 2013)
Memorandum: Table of Final 2013 Revisions to the Greenhouse Gas Reporting Rule (pdf) (1.02 MB, Sept 2013)
Proposed Preamble and Rule (04/02/2013) (pdf) (77 pp, 788 KB)		 2014
05/26/2011 76 FR 30782 Final Rule Finalizes confidentiality determinations for 34 subparts for data elements that are not inputs to emissions equations. Finalizes amendments to 40 CFR 2 governing CBI obtained under 40 CFR 98.
Final Preamble and Rule (05/26/2011) (pdf) (37 pp, 330 KB)
Proposed Preamble and Rule (07/07/2010) (pdf) (40 pp, 366 KB)
Correction Notice (10/17/2011) (pdf) (6 pp, 167 KB)
Response to Comments (05/26/2011)
Proposed Preamble and Rule (07/27/2010) (pdf) (4 pp, 164 KB)
Fact Sheet: Final Confidentiality Determinations for Data Collected Under the Greenhouse Gas Reporting Program and Amendments to Special Rules Governing Certain Information Obtained Under the Clean Air Act (pdf) (43.28 KB, May 2011)
Final Data Category Assignments and Confidentiality Determinations for Part 98 Reporting Elements (pdf) (1.76 MB)
CBI Powerpoint Presentation (pdf) (95.58 KB) 		2010
12/17/2010 75 FR 79092 Final Rule Corrects technical and editorial errors, and clarifies rule provisions for subparts A, C, D, F, G, P, V, X, Y, AA, NN, OO and PP.
Final Preamble and Rule (12/17/2010) (pdf) (81 pp, 667 KB)
Response to Comments (12/17/2010)
Fact Sheet: Revisions of Certain Provisions of the Mandatory Reporting of Greenhouse Gases Rule (pdf) (97.8 KB, Nov 2010)
Proposed Preamble and Rule (08/11/2010) (pdf) (72 pp, 478 KB)
More Information on Final Rule: Revisions (December 17, 2010)		 2010
10/30/2009 74 FR 56260 Final Rule Finalizes the first 30 subparts of 40 CFR Part 98, comprising subparts A, C, D, E, F, G, H, K, N, O, P, Q, R, S, U, V, X, Y, Z, AA, BB, CC, EE, GG, HH, JJ, LL, MM, NN, OO, and PP.
Final Preamble and Rule (10/30/2009) (pdf) (260 pp, 1.4 MB)
Proposed Mandatory Reporting of Greenhouse Gases Rule (pdf) (3.03 MB)
Proposed Mandatory Reporting of Greenhouse Gases Preamble (pdf) (3.71 MB)
Response to Public Comments-Subpart D (pdf) (242.86 KB, 09/2009)
4/10/2009 Technical Support Document (pdf) (272.5 KB, 01/30/2009) 		2010

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Last updated on June 13, 2025