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Rule2023-25269

Adoption and Submittal of State Plans for Designated Facilities: Implementing Regulations Under Clean Air Act Section 111(d)

Primary source

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Published
November 17, 2023
Effective
December 18, 2023

Issuing agencies

Environmental Protection Agency

Abstract

The Environmental Protection Agency (EPA) is finalizing amendments to the regulations that govern the processes and timelines for state and Federal plans to implement emission guidelines under Clean Air Act (CAA) New Source Performance Standards for existing sources (the "implementing regulations"). The amendments include revisions to the timing requirements for state and the EPA actions related to plans; the addition of mechanisms to improve flexibility and efficiency in plan processes; and new requirements for demonstration of timely meaningful engagement with pertinent stakeholders--including, but not limited to, industry, small businesses, and communities most affected by and vulnerable to the impacts of the plan. This action additionally provides a process for states' consideration of `remaining useful life and other factors' (RULOF) in applying a standard of performance; amends the definition of standard of performance in the implementing regulations; and clarifies compliance flexibilities that states may choose to incorporate into state plans, including trading or averaging. Finally, this action adds requirements for the electronic submission of state plans and provides several other clarifications and minor revisions to the implementing regulations.

Full Text

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<title>Federal Register, Volume 88 Issue 221 (Friday, November 17, 2023)</title>
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[Federal Register Volume 88, Number 221 (Friday, November 17, 2023)]
[Rules and Regulations]
[Pages 80480-80545]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2023-25269]



[[Page 80479]]

Vol. 88

Friday,

No. 221

November 17, 2023

Part IV





Environmental Protection Agency





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40 CFR Part 60





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Adoption and Submittal of State Plans for Designated Facilities: 
Implementing Regulations Under Clean Air Act Section 111(d); Final Rule

Federal Register / Vol. 88 , No. 221 / Friday, November 17, 2023 / 
Rules and Regulations

[[Page 80480]]


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ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 60

[EPA-HQ-OAR-2021-0527; FRL-8606-01-OAR]
RIN 2060-AV48


Adoption and Submittal of State Plans for Designated Facilities: 
Implementing Regulations Under Clean Air Act Section 111(d)

AGENCY: Environmental Protection Agency (EPA).

ACTION: Final rule.

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SUMMARY: The Environmental Protection Agency (EPA) is finalizing 
amendments to the regulations that govern the processes and timelines 
for state and Federal plans to implement emission guidelines under 
Clean Air Act (CAA) New Source Performance Standards for existing 
sources (the ``implementing regulations''). The amendments include 
revisions to the timing requirements for state and the EPA actions 
related to plans; the addition of mechanisms to improve flexibility and 
efficiency in plan processes; and new requirements for demonstration of 
timely meaningful engagement with pertinent stakeholders--including, 
but not limited to, industry, small businesses, and communities most 
affected by and vulnerable to the impacts of the plan. This action 
additionally provides a process for states' consideration of `remaining 
useful life and other factors' (RULOF) in applying a standard of 
performance; amends the definition of standard of performance in the 
implementing regulations; and clarifies compliance flexibilities that 
states may choose to incorporate into state plans, including trading or 
averaging. Finally, this action adds requirements for the electronic 
submission of state plans and provides several other clarifications and 
minor revisions to the implementing regulations.

DATES: This final rule is effective on December 18, 2023.

ADDRESSES: The EPA has established a docket for this action under 
Docket ID No. EPA-HQ-OAR-2021-0527. All documents in the docket are 
listed on the <a href="https://www.regulations.gov/">https://www.regulations.gov/</a> website. Although listed, 
some information is not publicly available, e.g., Confidential Business 
Information (CBI) or other information whose disclosure is restricted 
by statute. Certain other material, such as copyrighted material, is 
not placed on the internet and will be publicly available only in hard 
copy form. Publicly available docket materials are available 
electronically through <a href="https://www.regulations.gov/">https://www.regulations.gov/</a>.

FOR FURTHER INFORMATION CONTACT: For questions about this action 
contact Dr. Michelle Bergin, Sector Policies and Programs Division 
(Mail Code D205-01), Office of Air Quality Planning and Standards, U.S. 
Environmental Protection Agency, 109 T.W. Alexander Drive, P.O. Box 
12055, Research Triangle Park, North Carolina 27711; telephone number: 
(919) 541-2726; email address: <a href="/cdn-cgi/l/email-protection#3153544356585f1f5c585259545d5d54715441501f565e47"><span class="__cf_email__" data-cfemail="99fbfcebfef0f7b7f4f0faf1fcf5f5fcd9fce9f8b7fef6ef">[email&#160;protected]</span></a>.

SUPPLEMENTARY INFORMATION: Preamble acronyms and abbreviations. We use 
multiple acronyms and terms in this preamble. While this list may not 
be exhaustive, to ease the reading of this preamble and for reference 
purposes, the EPA defines the following terms and acronyms here:

ACE Affordable Clean Energy Rule
ALA American Lung Association
BSER Best System of Emission Reduction
CAA Clean Air Act
CBI confidential business information
CDX Central Data Exchange
CFR Code of Federal Regulations
EG Emission Guideline
EGU electric generating unit
EJ environmental justice
EPA Environmental Protection Agency
FIP Federal Implementation Plan
ICR Information Collection Request
IoP Increments of Progress
NAAQS National Ambient Air Quality Standards
OAQPS Office of Air Quality Planning and Standards
OMB Office of Management and Budget
PRA Paperwork Reduction Act
PM<INF>2.5</INF> fine particulate matter (2.5 microns and less)
RTC Response to Comments document
RFA Regulatory Flexibility Act
RIN Regulatory Information Number
RULOF remaining useful life and other factors
SIP State Implementation Plan
SpeCS State Planning Electronic Collaboration System
TAR Tribal Authority Rule
TAS Treatment as a State
TIP Tribal Implementation Plan
UMRA Unfunded Mandates Reform Act
U.S.C. United States Code

    Organization of this document. The information in this preamble is 
organized as follows:

I. General Information
    A. Does this action apply to me?
    B. Where can I get a copy of this document and other related 
information?
    C. Judicial Review and Administrative Review
II. Background
    A. What is the statutory authority for this action?
    B. What is the background for this action?
    C. What changes did we propose?
    D. What outreach and engagement did the EPA conduct?
III. What actions are we finalizing and what is our rationale for 
such decisions?
    A. Revised Implementing Timelines
    B. Federal Plan Authority and Timeline Upon Failure to Submit a 
Plan
    C. Outreach and Meaningful Engagement
    D. Regulatory Mechanisms for State Plan Implementation
    E. Remaining Useful Life and Other Factors (RULOF) Provisions
    F. Provision for Electronic Submission of State Plans
    G. Other Proposed Modifications and Clarifications
IV. Summary of Cost, Environmental, and Economic Impacts
V. Statutory and Executive Order Reviews
    A. Executive Order 12866: Regulatory Planning and Review; 
Executive Order 13563: Improving Regulation and Regulatory Review; 
and Executive Order 14094: Modernizing Regulatory Review
    B. Paperwork Reduction Act (PRA)
    C. Regulatory Flexibility Act (RFA)
    D. Unfunded Mandates Reform Act (UMRA)
    E. Executive Order 13132: Federalism
    F. Executive Order 13175: Consultation and Coordination With 
Indian Tribal Governments
    G. Executive Order 13045: Protection of Children From 
Environmental Health Risks and Safety Risks
    H. Executive Order 13211: Actions Concerning Regulations That 
Significantly Affect Energy Supply, Distribution, or Use
    I. National Technology Transfer and Advancement Act (NTTAA)
    J. Executive Order 12898: Federal Actions To Address 
Environmental Justice in Minority Populations and Low-Income 
Populations
    K. Congressional Review Act (CRA)

I. General Information

A. Does this action apply to me?

    This action applies for the development and adoption of plans for 
implementation of CAA section 111(d) final emission guidelines (EGs) 
published in the Federal Register after July 8, 2019. In particular, 
this action applies to states in the development and submittal of state 
plans and to the EPA in processing state plan submissions and to the 
EPA in promulgating Federal plans. After the EPA promulgates a final 
EG, each state that has one or more designated facilities must develop, 
adopt, and submit to the EPA a state plan under CAA section 111(d). The 
term ``designated facility'' means ``any existing facility . . . which 
emits a designated pollutant and which would be subject to a standard 
of performance for that pollutant if the existing facility were an 
affected facility [i.e., a new source].'' See 40 CFR 60.21a(b). If a 
state fails to submit a plan or if the EPA determines that a state plan 
is not

[[Page 80481]]

satisfactory, the EPA has the authority to establish a Federal CAA 
section 111(d) plan for designated facilities located in the state.
    Under the Tribal Authority Rule (TAR), eligible tribes may seek 
approval to implement a plan under CAA section 111(d) in a manner 
similar to a state. See 40 CFR part 49, subpart A. Tribes may, but are 
not required to, seek approval for treatment in a manner similar to a 
state (treatment as a state; TAS) for purposes of developing a Tribal 
Implementation Plan (TIP) implementing an EG. If a tribe obtains 
approval and submits a TIP, the EPA will use similar timelines and 
criteria and will follow similar procedures as those for state plans. 
Tribes that choose to develop plans will have the same flexibilities 
available to states in this process. The TAR authorizes tribes to 
develop and implement one or more of its own air quality programs, or 
portions thereof, under the CAA; however, it does not require tribes to 
develop a CAA program. Tribes may implement programs that are most 
relevant to their air quality needs. A tribe with an approved TAS under 
TAR for CAA 111(d) is not required to resubmit TAS approval to 
implement an EG subject to subpart Ba.\1\ If a tribe does not seek and 
obtain the authority from the EPA to establish a TIP, the EPA has the 
authority to establish a Federal CAA section 111(d) plan for designated 
facilities that are located in areas of Indian country. A Federal plan 
would apply to all designated facilities located in the areas of Indian 
country covered by the Federal plan unless and until the EPA approves a 
TIP applicable to those facilities.
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    \1\ See the EPA website, <a href="https://www.epa.gov/tribal/tribes-approved-treatment-state-tas">https://www.epa.gov/tribal/tribes-approved-treatment-state-tas</a>, for information on those tribes that 
have treatment as a state for specific environmental regulatory 
programs, administrative functions, and grant programs.
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B. Where can I get a copy of this document and other related 
information?

    In addition to being available in the docket, an electronic copy of 
this action is available on the internet. Following signature by the 
EPA Administrator, the EPA will post a copy of this final action at 
<a href="https://www.epa.gov/stationary-sources-air-pollution/adoption-and-submittal-state-plans-designated-facilities-40-cfr">https://www.epa.gov/stationary-sources-air-pollution/adoption-and-submittal-state-plans-designated-facilities-40-cfr</a>. Following 
publication in the Federal Register, the EPA will post the Federal 
Register version of the final rule, a memorandum showing the rule edits 
finalized in this action, and key supporting documents at this same 
website.

C. Judicial Review and Administrative Review

    Section 307(b)(1) of the CAA governs judicial review of final 
actions by the EPA. This section provides, in part, that petitions for 
review must be filed in the D.C. Circuit: (i) when the agency action 
consists of ``nationally applicable regulations promulgated, or final 
actions taken, by the Administrator,'' or (ii) when such action is 
locally or regionally applicable, but ``such action is based on a 
determination of nationwide scope or effect and if in taking such 
action the Administrator finds and publishes that such action is based 
on such a determination.'' For locally or regionally applicable final 
actions, the CAA reserves to the EPA complete discretion whether to 
invoke the exception in (ii) described in the preceding sentence.\2\
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    \2\ Sierra Club v. EPA, 47 F.4th 738, 745 (D.C. Cir. 2022) 
(``EPA's decision whether to make and publish a finding of 
nationwide scope or effect is committed to the agency's discretion 
and thus is unreviewable''); Texas v. EPA, 983 F.3d 826, 834-35 (5th 
Cir. 2020).
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    This action is ``nationally applicable'' within the meaning of CAA 
section 307(b)(1). The final rule governs the EPA's promulgation of 
emission guidelines under CAA section 111(d), which are nationally 
applicable regulations for which judicial review is available only in 
the U.S. Court of Appeals for the District of Columbia (D.C. Circuit) 
pursuant to CAA section 307(b)(1).\3\ Moreover, it revises the 
generally applicable, nationally consistent implementing regulations 
that govern the development and submission for all states of state 
plans and the EPA's development of Federal plans pursuant to EGs under 
CAA section 111(d), as well as the EPA's review of states' plans.
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    \3\ See, e.g., Nat'l Waste & Recyling Ass'n v. EPA, No. 16-1371 
(D.C. Cir. 2016) (consolidated challenges to the CAA section 111(d) 
emissions guidelines for municipal solid waste landfills in the D.C. 
Circuit); Am. Lung Ass'n v. EPA, 985 F.3d 914 (D.C. Cir. 2021) 
(consolidated challenges to, among other things, the CAA section 
111(d) emission guidelines for fossil fuel-fired electric generating 
units known as the Affordable Clean Energy Rule).
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    In the alternative, to the extent a court finds this final action 
to be locally or regionally applicable, the Administrator is exercising 
the complete discretion afforded to him under the CAA to make and 
publish a finding that this action is based on a determination of 
``nationwide scope or effect'' within the meaning of CAA section 
307(b)(1).\4\ As explained above, this final action is revising a 
single set of nationally consistent implementing regulations that apply 
to every state that must develop a state plan submission pursuant to 
CAA section 111(d) and an EPA-issued EG, as well as apply to the EPA 
when it reviews state plan submissions. The regulations also govern the 
EPA's development of EGs pursuant to CAA section 111(d), which apply to 
every state that contains designated facilities.
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    \4\ In deciding whether to invoke the exception by making and 
publishing a finding that an action is based on a determination of 
nationwide scope or effect, the Administrator takes into account a 
number of policy considerations, including his judgment balancing 
the benefit of obtaining the D.C. Circuit's authoritative 
centralized review versus allowing development of the issue in other 
contexts and the best use of agency resources.
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    The Administrator finds that this is a matter on which national 
uniformity in judicial resolution of any petitions for review is 
desirable, to take advantage of the D.C. Circuit's administrative law 
expertise, and to facilitate the orderly development of the law under 
the Act. The Administrator also finds that consolidated review of this 
action in the D.C. Circuit will avoid piecemeal litigation in the 
regional circuits, further judicial economy, and eliminate the risk of 
inconsistent results, and that a nationally consistent approach to 
implementation of EGs pursuant to CAA section 111(d) constitutes the 
best use of agency resources.
    For these reasons, this final action is nationally applicable or, 
alternatively, the Administrator is exercising the complete discretion 
afforded to him by the CAA and finds that this final action is based on 
a determination of nationwide scope or effect for purposes of CAA 
section 307(b)(1) and is publishing that finding in the Federal 
Register. Under section 307(b)(1) of the CAA, petitions for judicial 
review of this action must be filed in the United States Court of 
Appeals for the District of Columbia Circuit by January 16, 2024. Under 
CAA section 307(b)(2), the requirements established by this final rule 
may not be challenged separately in any civil or criminal proceedings 
brought by the EPA to enforce the requirements.
    Additionally, pursuant to CAA section 307(d)(1)(V), the 
Administrator determines that this action is subject to the provisions 
of CAA section 307(d). The EPA made this determination at proposal and 
has complied with the applicable procedural requirements in the course 
of this rulemaking. Section 307(d)(1)(V) of the CAA provides that the 
provisions of CAA section 307(d) apply to ``such other actions as the 
Administrator may determine.'' Section 307(d)(7)(B) of the CAA further 
provides that ``[o]nly an objection to a rule or procedure which was 
raised with reasonable specificity during the period

[[Page 80482]]

for public comment (including any public hearing) may be raised during 
judicial review.'' This section also provides a mechanism for the EPA 
to convene a proceeding for reconsideration, ``[i]f the person raising 
an objection can demonstrate to the Administrator that it was 
impracticable to raise such objection within [the period for public 
comment] or if the grounds for such objection arose after the period 
for public comment (but within the time specified for judicial review) 
and if such objection is of central relevance to the outcome of the 
rule.'' Any person seeking to make such a demonstration should submit a 
Petition for Reconsideration to the Office of the Administrator, U.S. 
Environmental Protection Agency, Room 3000, WJC South Building, 1200 
Pennsylvania Ave. NW, Washington, DC 20460, with a copy to both the 
person listed in the preceding FOR FURTHER INFORMATION CONTACT section, 
and the Associate General Counsel for the Air and Radiation Law Office, 
Office of General Counsel (Mail Code 2344A), U.S. Environmental 
Protection Agency, 1200 Pennsylvania Ave. NW, Washington, DC 20460.
    The EPA notes that the individual regulatory provisions it is 
revising or finalizing in this action are severable from one another 
because each is supported by an independent rationale. That is, the 
individual subsections within each of the sections of subpart Ba are 
generally justified independently and are therefore severable for 
purposes of judicial review.

II. Background

A. What is the statutory authority for this action?

    The statutory authority for this action is provided by CAA section 
111 (42 U.S.C. 7411). As described further in the next section, CAA 
section 111 requires the EPA to establish standards of performance for 
certain categories of stationary sources that, in the Administrator's 
judgment, ``cause[ ], or contribute[] significantly to, air pollution 
which may reasonably be anticipated to endanger public health or 
welfare.'' CAA section 111(b) provides the EPA's authority to regulate 
new and modified sources, while CAA section 111(d) directs the EPA to 
``prescribe regulations which shall establish a procedure'' for states 
to submit plans to the EPA that establish standards of performance for 
existing sources of certain air pollutants to which a standard would 
apply if such existing source were a new source. The EPA addresses its 
obligation under CAA section 111(d) to establish a procedure for states 
to submit plans both through its promulgation of general implementing 
regulations, including those addressed by this action, and through 
promulgation of EGs for specific source categories. Additional 
statutory authority for this action is provided by section 301 of the 
CAA (42 U.S.C. 7601), which contains general provisions for the 
administration of the CAA, including the authority for the 
Administrator to ``prescribe such regulations as are necessary to carry 
out [the] functions'' of the CAA under section 301(a)(1).

B. What is the background for this action?

    Clean Air Act section 111(d) governs the establishment of standards 
of performance for existing stationary sources. CAA section 111(d) 
directs the EPA to ``prescribe regulations which shall establish a 
procedure similar to that provided by [CAA section 110]'' for states to 
submit state plans that establish standards of performance for existing 
sources of certain air pollutants to which a standard of performance 
would apply if such an existing source were a new source under CAA 
section 111(b). Therefore, an existing source can only be regulated 
under CAA section 111(d) if it belongs to a source category that is 
regulated under CAA section 111(b). The EPA's implementing regulations 
use the term ``designated facility'' to identify those existing 
sources. See 40 CFR 60.21a(b).
    CAA section 111(b)(1)(A) requires that a source category be 
included on the list for regulation if, ``in [the EPA Administrator's] 
judgment it causes, or contributes significantly to, air pollution 
which may reasonably be anticipated to endanger public health or 
welfare.'' Once a source category is listed, CAA section 111(b)(1)(B) 
requires that the EPA propose and then promulgate ``standards of 
performance'' for new sources in such source category. CAA section 
111(a)(1) defines a ``standard of performance'' as ``a standard for 
emissions of air pollutants which reflects the degree of emission 
limitation achievable through the application of the best system of 
emission reduction which (taking into account the cost of achieving 
such reduction and any nonair quality health and environmental impact 
and energy requirements) the Administrator determines has been 
adequately demonstrated.'' This provision requires the EPA to determine 
both the best system of emission reduction (BSER) for the regulated 
source category and the degree of emission limitation achievable 
through application of the BSER. The EPA must then, under CAA section 
111(b)(1)(B), promulgate standards of performance for new sources that 
reflect that level of stringency.
    Once the EPA promulgates standards of performance for new sources 
within a particular source category, the EPA is required, in certain 
circumstances, to regulate emissions from existing sources in that same 
source category.\5\ Under CAA section 111(d), the Agency has, to date, 
issued EGs regulating five pollutants from six source categories that 
are currently in effect (i.e., sulfuric acid plants (acid mist), 
phosphate fertilizer plants (fluorides), primary aluminum plants 
(fluorides), kraft pulp plants (total reduced sulfur), municipal solid 
waste landfills (landfill gases)), and fossil fuel-fired electric 
generating units (greenhouse gases [GHGs]). See ``Phosphate Fertilizer 
Plants; Final Guideline Document Availability,'' 42 FR 12022 (March 1, 
1977); ``Standards of Performance for New Stationary Sources; Emission 
Guideline for Sulfuric Acid Mist,'' 42 FR 55796 (October 18, 1977); 
``Kraft Pulp Mills, Notice of Availability of Final Guideline 
Document,'' 44 FR 29828 (May 22, 1979); ``Primary Aluminum Plants; 
Availability of Final Guideline Document,'' 45 FR 26294 (April 17, 
1980); ``Emission Guidelines and Compliance Times for Municipal Solid 
Waste Landfills,'' 81 FR 59276 (August 29, 2016); ``Repeal of the Clean 
Power Plan; Emission Guidelines for Greenhouse Gas Emissions From 
Existing Electric Utility Generating Units; Revisions to Emission 
Guidelines Implementing Regulations,'' 84 FR 32520 (July 8, 2019) 
(Affordable Clean Energy (ACE) Rule).<SUP>6 7</SUP> Additionally, the

[[Page 80483]]

EPA recently proposed EGs addressing GHG emissions from two different 
source categories. On November 15, 2021, the EPA proposed EGs to 
regulate GHG emissions (in the form of methane limitations) from 
sources in the oil and natural gas source category (86 FR 63110) and 
provided a supplemental proposal for that sector on December 6, 2022 
(87 FR 74702). On May 23, 2023, the EPA proposed to repeal the existing 
EG for GHG emissions from certain fossil fuel-fired electric generating 
units (the ACE Rule) and to promulgate a new EG in order to regulate 
GHG emissions (in the form of carbon dioxide limitations) from existing 
fossil fuel-fired electric generating units. 88 FR 33240. Finally, the 
Agency has regulated additional pollutants from solid waste 
incineration units under CAA section 129 and in accordance with CAA 
section 111(d).\8\
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    \5\ In accordance with CAA section 111(d), states are required 
to submit plans to establish standards of performance for existing 
sources for any air pollutant: (1) the emission of which is subject 
to a Federal New Source Performance Standard; and (2) which is 
neither a pollutant regulated under CAA section 108(a) (i.e., 
criteria air pollutants such as ground-level ozone and particulate 
matter, and their precursors, like volatile organic compound) or a 
hazardous air pollutant regulated from the same source category 
under CAA section 112. See also definition of ``designated 
pollutant'' in 40 CFR 60.21a(a).
    \6\ The EPA has also issued several EGs that have subsequently 
been repealed or vacated by the courts. The EPA regulated mercury 
from coal-fired electric power plants in a 2005 rule that was 
vacated by the D.C. Circuit, ``Standards of Performance for New and 
Existing Stationary Sources: Electric Utility Steam Generating 
Units; Final Rule,'' 70 FR 28606 (May 18, 2005) (Clean Air Mercury 
Rule), vacated by New Jersey v. EPA, 517 F.3d 574 (D.C. Cir. 2008). 
The EPA also issued CAA section 111(d) EGs regulating GHG emissions 
from fossil fuel-fired electric power plants in a 2015 rule, 
``Carbon Pollution Emission Guidelines for Existing Stationary 
Sources: Electric Utility Generating Units; Final Rule,'' 80 FR 
64662 (October 23, 2015) (Clean Power Plan). The EPA subsequently 
repealed and replaced the 2015 rule with the ACE Rule.
    \7\ The ACE Rule was initially vacated by Am. Lung Ass'n v. EPA, 
985 F.3d 914 (D.C. Cir. 2021). The Supreme Court subsequently 
reversed and remanded the D.C. Circuit's opinion, West Virginia v. 
EPA, 142 S. Ct. 2587 (June 30, 2022). On October 27, 2022, the D.C. 
Circuit amended its judgement and recalled the partial mandate 
vacating the ACE Rule, effectively reinstating ACE. Order, ALA v. 
EPA, No. 19-1140, ECF No. 1970895.
    \8\ CAA section 129 directs the EPA Administrator to develop 
regulations under CAA section 111 limiting emissions of nine air 
pollutants from four categories of solid waste incineration units.
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    The mechanism for regulating designated facilities \9\ under CAA 
section 111(d) differs from the mechanism for regulating new facilities 
under CAA section 111(b). Pursuant to CAA section 111(b), the EPA 
promulgates standards of performance that are directly applicable to 
new, modified, and reconstructed facilities in a specified source 
category. In contrast, CAA section 111(d) operates together with CAA 
section 111(a)(1) to collectively establish and define roles and 
responsibilities for both the EPA and the states in the regulation of 
designated facilities. Under the statutory framework, the EPA has the 
responsibility to determine the BSER for designated facilities, as well 
as the degree of emission limitation achievable through application of 
that BSER. The EPA identifies both the BSER and the degree of emission 
limitation as part of an EG, which it may typically reflect as a 
presumptive standard of performance or methodology for calculating a 
presumptive standard of performance for designated facilities. States 
use the EPA's presumptive standards of performance as the basis for 
establishing requirements for designated facilities in their state 
plans. In addition to standards of performance, CAA section 111(d)(1) 
requires state plans to include provisions for the implementation and 
enforcement of such standards. CAA section 111(d)(1) also requires the 
EPA's regulations to permit states, in applying a standard of 
performance to particular sources, to take into account the source's 
remaining useful life and other factors, a process addressed in more 
detail in section III.E of this preamble.
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    \9\ A ``designated facility'' is any existing facility which 
emits an air pollutant, the emissions of which are subject to a 
standard of performance for new stationary sources but for which air 
quality criteria have not been issues and that is not included on a 
list published under CAA section 108(a) or 112, and which would be 
subject to a standard of performance for that pollutant if the 
existing facility were a new facility. See 40 CFR 60.21a.
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    CAA section 111(d) directs the EPA to establish a procedure for the 
submission of state plans, which the EPA addresses both through its 
promulgation of general implementing regulations for section 111(d) and 
through promulgation of EGs for specific source categories. While CAA 
section 111(d)(1) authorizes states to develop state plans that 
establish standards of performance and provides states with certain 
discretion in determining the appropriate standards, CAA section 
111(d)(2) provides the EPA a specific oversight role with respect to 
such state plans. The states must submit their plans to the EPA, and 
the EPA must evaluate each state plan to determine whether each plan is 
``satisfactory.'' If a state fails to submit a plan or the EPA 
determines that a state plan is not satisfactory, the EPA has the 
``same authority'' to prescribe a Federal plan as it has to promulgate 
a Federal Implementation Plan (FIP) under CAA section 110(c).
    In 1975, the EPA issued the first general implementing regulations 
to prescribe the process for the adoption and submittal of state plans 
for designated facilities under CAA section 111(d) (codified at 40 CFR 
part 60, subpart B (subpart B)). 40 FR 53340 (November 17, 1975). 
Responding to the direction to ``establish a procedure similar to that 
provided by'' CAA section 110, in promulgating subpart B, the EPA 
aligned the timing requirements for state and Federal plans under CAA 
section 111(d) with the then-applicable timeframes for State 
Implementation Plans (SIPs) and FIPs prescribed in CAA section 110, as 
established by the 1970 CAA Amendments. The implementing regulations 
were not significantly revised after their original promulgation in 
1975 \10\ until 2019, when the EPA promulgated a new set of 
implementing regulations codified at 40 CFR part 60, subpart Ba 
(subpart Ba). 84 FR 32520 (July 8, 2019).
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    \10\ In 2012, the EPA revised several provisions of subpart B, 
mainly to include allowance systems as a form of standard of 
performance. 77 FR 9303 (February 16, 2012).
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    In promulgating subpart Ba in 2019, the EPA intended to update and 
modernize the implementing regulations to align the procedures for CAA 
section 111(d) state and Federal plans with CAA amendments made after 
subpart B was first promulgated in 1975. Notably, subpart B did not 
align either with CAA section 111(d) as amended by Congress in 1977 or 
with the timelines in CAA section 110 as amended by Congress in 1990. 
The EPA therefore considered it appropriate to update the implementing 
regulations for CAA section 111(d) to make changes similar to CAA 
section 110, given that section 111(d)(1) of the CAA directs the EPA to 
``prescribe regulations which shall establish a procedure similar to 
that provided by section 110'' of the CAA for states to submit plans to 
the EPA. In promulgating subpart Ba, the EPA directly aligned the 
timing requirements for CAA section 111(d) state and Federal plans (40 
CFR 60.23a(a)(1) and 60.27a(c), respectively) with the timing 
requirements for SIPs and FIPs under CAA section 110 (see CAA section 
110(a)(1) and 110(c)(1), respectively).
    In promulgating subpart Ba, the EPA also added the definition of 
``standard of performance'' (40 CFR 60.21a(f)) (defined under subpart B 
as ``emission standard'' (40 CFR 60.21(f))) and the ``remaining useful 
life'' provision (40 CFR 60.24a(e)) (referred under subpart B as the 
``variance'' provision (40 CFR 60.24(f))). The EPA further added 
required minimum administrative and technical criteria for inclusion in 
state plans (40 CFR 60.27a(g)). Applying these criteria, the EPA 
determines whether a state plan or portion of a plan submitted is 
complete (referred to as a completeness review). Once a state plan or 
portion of a plan is determined to be complete, the EPA must approve or 
disapprove the plan or portions of the plan. For details on the EPA's 
rationale for the promulgation of these provisions, see 84 FR 32520 
(July 8, 2019).
    The EPA proposed minor revisions to the subpart Ba applicability 
provision and is finalizing those revisions largely as proposed (see 
section III.G.2.a. of this preamble). As finalized in 2019, subpart Ba 
was applicable to any final 111(d) EG published, or the implementation 
of which was ongoing, after July 8, 2019. The EPA proposed revisions to 
this provision for clarity, including to

[[Page 80484]]

remove the phrase ``if implementation of such final guideline is 
ongoing.'' \11\ It did not propose to change the already-established 
applicability date. At the time of promulgation of this rule, there are 
no final EGs that have been published after July 8, 2019, so subpart Ba 
will not retroactively apply to the implementation of any EG. 
Specifically, the final EG for greenhouse gas emissions from existing 
electric utility generating units that was included in the ACE Rule was 
published on July 8, 2019; \12\ thus, subpart Ba as revised will not 
apply to that EG. Regardless, the EPA proposed to repeal the ACE Rule 
on May 23, 2023,\13\ and intends to finalize its repeal, at which point 
neither states nor the EPA will have any obligations under the ACE Rule 
and the potential applicability of subpart Ba to this EG will be moot. 
In contrast, the EPA has recently proposed two EGs that would regulate 
GHG emissions from designated facilities in the oil and natural gas 
industry (86 FR 63110, November 15, 2021; 87 FR 74702, December 6, 
2022) and in the power sector (88 FR 33240, May 23, 2023). If those EGs 
are finalized and to the extent that the final EGs do not contain EG-
specific requirements superseding subpart Ba provisions, subpart Ba as 
revised in this action will apply. Subpart B continues to apply to CAA 
section 111 EGs promulgated on or prior to July 8, 2019, and to EGs 
issued pursuant to CAA section 129.
---------------------------------------------------------------------------

    \11\ 87 FR 79176, 79208-09 (Dec. 23, 2022). As explained in 
section III.G.2.a. of this preamble, the EPA is finalizing the 
removal of this phrase from 40 CFR 60.20a(a).
    \12\ 84 FR 32520 (July 8, 2019).
    \13\ ``New source Performance Standards for Greenhouse Gas 
Emissions From New, Modified, and Reconstructed Fossil Fuel-Fired 
Electric Generating Units; Emission Guidelines for Greenhouse Gas 
Emissions From Existing Fossil Fuel-Fired Electric Generating Units; 
and Repeal of the Affordable Clean Energy Rule,'' 88 FR 33240 (May 
23, 2023).
---------------------------------------------------------------------------

    In January 2021, the D.C. Circuit vacated several provisions of 
subpart Ba related to timelines for state plans and Federal plans. Am. 
Lung Ass'n v. EPA, 985 F.3d 914, 991. (D.C. Cir. 2021) (ALA).\14\ In 
this vacatur, the court identified several flaws in the EPA's rationale 
for extending CAA section 111(d) state and Federal plan timelines. 
First, the court found that the EPA erred in adopting the timelines for 
SIPs and FIPs in CAA section 110 without meaningfully addressing the 
differences in the scale of effort required for development and 
evaluation of CAA section 110 SIPs, as compared with the scale of 
effort needed for CAA section 111(d) state plans. Id. at 992-93. The 
court also concluded that in promulgating the timelines in subpart Ba, 
the EPA failed to justify why the shorter deadlines under subpart B 
were unworkable. Id. at 993. Further, the court held that the EPA was 
required to consider the effect of its subpart Ba timelines on public 
health and welfare, consistent with the statutory purpose of CAA 
section 111(d). In the court's view, the EPA's ``complete failure to 
say anything at all about the public health and welfare implications of 
the extended timeframes'' meant that the EPA failed to consider an 
important aspect of the problem. Id. at 992 (citing Motor Vehicle Mfrs. 
Ass'n of U.S., Inc. v. State Farm Mut. Auto. Ins. Co. 463 U.S. 29, 43 
(1983)).
---------------------------------------------------------------------------

    \14\ The Supreme Court subsequently reversed and remanded the 
D.C. Circuit's opinion. West Virginia v. EPA, 142 S.Ct. 2587 (June 
30, 2022). However, no Petitioner sought certiorari on, and the 
Supreme Court's West Virginia decision did not implicate, the D.C. 
Circuit's vacatur of portions of subpart Ba. See Amended Judgment, 
ALA v. EPA, No. 19-1140 (D.C. Cir. October 27, 2022), ECF No. 
1970898 (ordering that petitions for review challenging the timing 
portion of implementing regulations be granted).
---------------------------------------------------------------------------

    Based on these reasons, the court vacated the timeline for state 
plan submissions after publication of a final EG (40 CFR 60.23a(a)(1)), 
the EPA's deadline for taking action on state plan submissions (40 CFR 
60.27a(b)), the EPA's deadline for promulgating a Federal plan (40 CFR 
60.27a(c)), and the timeline associated with requirements for 
increments of progress (IoPs; 40 CFR 60.24 (a(d)). Because of the 
vacatur, subpart Ba currently does not provide generally applicable 
timelines for state plan submissions, a deadline for the EPA's action 
on state plan submissions, a deadline for the EPA's promulgation of a 
Federal plan, or a timeline associated with requirements for IoPs. The 
EPA notes that while it is finalizing generally applicable timelines 
for the implementing regulations, a particular EG may supersede those 
generally applicable timelines with its own specific timelines. 40 CFR 
60.20a(a)(1). This may be appropriate, for example, based on the 
complexity of regulating a particular source category, such as a 
category with a large number of disparate facilities to be regulated.

C. What changes did we propose?

    On December 23, 2022, the EPA proposed several revisions to subpart 
Ba both to address the vacatur of the timing provisions by the D.C. 
Circuit in ALA and to further improve the state and Federal plan 
development and implementation process. See 87 FR 79176 (December 23, 
2022). In response to the ALA decision, the EPA proposed timeframes for 
(1) state plan submittal, (2) the timeline for the EPA to determine 
completeness of state plans, (3) the EPA's action on state plan 
submissions, (4) the EPA's promulgation of a Federal plan, and (5) 
requirements to establish IoPs. Additionally, the EPA proposed to 
remove the publication in the Federal Register of a ``finding of 
failure to submit'' as the starting point for the clock to promulgate a 
Federal plan.
    In addition, the EPA proposed revisions to subpart Ba that would 
enhance the provision of reasonable notice and opportunity for public 
participation by requiring that states, as part of the state plan 
development or revision process, undertake outreach and meaningful 
engagement with a broad range of pertinent stakeholders. The EPA 
proposed to define pertinent stakeholders as including communities most 
affected by and vulnerable to the impacts of the plan or plan revision. 
Increased vulnerability, as described in the proposal, may be 
attributable, among other reasons, to both an accumulation of negative 
and lack of positive environmental, health, economic, or social 
conditions within these populations or communities.
    To improve flexibility and efficiency in the submission, review, 
approval, and implementation of state plans, the EPA proposed to 
include the following mechanisms in subpart Ba, all of which currently 
exist under CAA section 110: (1) partial approval/disapproval, (2) 
conditional approval, (3) allowance for parallel processing, (4) a 
mechanism for the EPA to call for plan revisions, and (5) an error 
correction mechanism.
    The EPA also proposed revisions to the existing regulations 
governing the ``remaining useful life and other factors'' (RULOF) 
provision of the statute. These proposed revisions were intended to 
promote clarity and increase consistency in situations where states or 
the EPA consider RULOF when applying standards of performance to 
individual sources and to ensure that such standards fulfill the 
statutory requirements of CAA section 111(d).
    Finally, the EPA proposed to require electronic submissions of 
state plans, as well as additional modifications and clarifications to 
subpart Ba. In particular, the EPA proposed clarifying amendments to 
the subpart Ba definition of standard of performance, along with a 
revised interpretation of CAA section 111(d) with respect to 
permissible compliance flexibilities. The EPA proposed to determine 
that, under appropriate circumstances, the Agency may approve state 
plans that authorize sources to meet their emission limits in the 
aggregate, such as through standards that permit compliance via

[[Page 80485]]

trading or averaging. In doing so, the EPA also proposed to conclude 
that CAA section 111 does not limit the BSER to controls that can be 
applied at and to the source.
    The EPA did not reopen any subpart Ba requirements other than the 
specific provisions that the EPA explicitly proposed to revise in the 
December 2022 notice of proposed rulemaking. Any comments received on 
the proposal that did not relate to the proposed revisions or additions 
are considered out of the scope of this action.

D. What outreach and engagement did the EPA conduct?

    The EPA conducted both pre- and post-proposal outreach and 
meaningful engagement events with environmental justice (EJ) 
communities, small businesses, states, and Tribes. On July 7 and July 
11, 2022, the EPA conducted two pre-proposal webinars for states 
addressing meaningful engagement for pertinent stakeholders, and on 
July 26, 2022, the Agency conducted a pre-proposal webinar for EJ 
communities and other key stakeholders about potential requirements for 
states to conduct meaningful engagement in developing their state 
plans. The EPA emailed an announcement of the subpart Ba proposal to 
Tribal nations and environmental justice communities via existing 
listservs on December 15, 2022. Post-proposal outreach during the 
public comment period with environmental justice communities included 
participation on the January 24, 2023 Environmental Justice National 
call and the January 26, 2023 National Tribal Air Association call. The 
EPA also conducted a public training webinar on January 31, 2023, for 
environmental justice community members and their representatives. 
Additionally, the EPA conducted post-proposal outreach with small 
businesses through the Small Business Environmental Assistance Program 
call on February 21, 2023, and with state environmental protection 
associations including the Association of Air Pollution Control 
Agencies on January 10, 2023, and the National Association of Clean Air 
Agencies on February 8, 2023.

III. What actions are we finalizing and what is our rationale for such 
decisions?

    This action finalizes amendments to subpart Ba, including the 
timing requirements for state plan submittal, the EPA's action on state 
plan submissions, the EPA's promulgation of a Federal plan, and the 
establishment of IoPs; the addition of five regulatory mechanisms to 
improve state plan processing: (1) partial approval/disapproval, (2) 
conditional approval, (3) allowance for parallel processing, (4) a 
mechanism for the EPA to call for plan revisions, and (5) an error 
correction mechanism; new requirements for meaningful engagement with 
pertinent stakeholders; and amended requirements for states' and the 
EPA's consideration of RULOF in applying a standard of performance in 
certain circumstances. This action also finalizes amendments to the 
subpart Ba definition of ``standard of performance'' and finalizes 
clarifications associated with CAA section 111(d) compliance 
flexibilities. Finally, this action finalizes requirements for the 
electronic submission of state plans and several other clarifications 
and minor revisions to the implementing regulations. While the EPA is 
finalizing most amendments as proposed, in response to comments 
submitted on the proposal, the EPA is extending the state plan 
submittal timeline and the timeline for requirement of IoPs; providing 
for additional flexibility and guidance for meaningful engagement; as 
well as revising and streamlining the requirements for accounting for 
RULOF in applying a less-stringent standard. There are also other 
provisions that we are finalizing with slight revisions relative to 
proposal. Further detail is provided in the following sections of this 
preamble and additional detailed responses to comments are located in 
the response to comment document (RTC).
    While this action amends the generally applicable requirements of 
subpart Ba, the EPA has recognized that, under certain circumstances, 
some provisions of the implementing regulations may not fit the needs 
of a specific EG. Therefore, the existing implementing regulations 
provide that each EG may include specific implementing provisions in 
addition to or that supersede the requirements of subpart Ba. 40 CFR 
60.20a(a)(1). The EPA will address source category-specific 
circumstances or facts that are not accommodated by the general 
provisions of subpart Ba through a specific EG, as the time and 
processes needed for development and adoption of state plans to 
implement the EG may be affected by unique characteristics of a source 
category. For example, if a proposed EG addresses a particularly large 
and complex source category that necessitates a relatively long 
timeframe for state planning, the EPA may provide a state plan 
submission deadline that is longer than the 18 months being finalized 
for subpart Ba.\15\
---------------------------------------------------------------------------

    \15\ See, e.g., 88 FR 33240, 33402-03 (May 23, 2023) (proposing 
a 24-month state plan submission deadline for the EG for GHG 
emissions from fossil fuel-fired electric generating units).
---------------------------------------------------------------------------

A. Revised Implementing Timelines

    As described in section II.A. of this preamble, the subpart Ba 
timing requirements were vacated by the D.C. Circuit in the ALA 
decision. These vacated timing requirements include: the timeline for 
state plan submissions, the timeline for the EPA to act on a state 
plan, the timeline for the EPA to promulgate a Federal plan, and the 
timeline that dictates when state plans must include IoPs. These 
timelines are all critical to ensuring that the emission reductions 
anticipated by the EPA when promulgating an EG become federally 
enforceable measures that are timely implemented by the designated 
facilities.
    The EPA proposed the following timelines to replace those vacated 
in ALA (87 FR 79176, Dec. 23, 2022): 15 months for state plan 
submissions after publication of a final EG; 60 days after submission 
for the EPA to determine if a plan is complete; 12 months for the EPA 
to take final action on a complete state plan (i.e., approve, 
disapprove); 12 months for the EPA to promulgate a Federal plan either 
after the state plan submission deadline if a state has failed to 
submit a complete plan, or after the EPA's disapproval of a state plan 
submission; and requiring state plans to include IoPs if the plan 
requires final compliance with standards of performance later than 16 
months after the plan submission deadline.\16\
---------------------------------------------------------------------------

    \16\ See 87 FR 79176, 79181-90 (Dec. 23, 2022).
---------------------------------------------------------------------------

    The EPA received numerous comments on these proposed timelines, 
most of which expressed support for timelines longer than those 
proposed. Some commenters asserted that the ALA decision does not 
direct the EPA to necessarily reduce timelines from those vacated, only 
to justify the timelines more fully. In particular, most commenters 
expressed the need for a longer state plan submittal timeline in order 
to accommodate state regulatory processes associated with plan 
submittals (i.e., legislative and/or administrative state processes), 
as well as to accommodate technical development of the plans and to 
implement the proposed meaningful engagement requirements. However, a 
few commenters noted that the EPA should not accommodate all lengthy 
state administrative processes that would unnecessarily postpone 
emission-reduction obligations. Some

[[Page 80486]]

commenters asserted that if the EPA were to finalize the state plan 
submittal timeline as proposed, the EPA should include a mechanism in 
the rule for states to request for extensions for state plan 
submittals.
    While some commenters also asserted the need for longer timelines 
associated with the EPA's obligations to take action on a state plan 
submittal and to promulgate a Federal plan when required, as well as 
allowing a longer timeline before IoPs are required in the state plans, 
other commenters supported the proposed timelines for these milestones 
based, among other concerns, on the need for timely protection of 
health and welfare and in consideration of the EPA's ability to extend 
timelines if warranted in a particular EG.
    In consideration of these comments and for the reasons described in 
detail in the sections that follow, the EPA is finalizing extended 
timelines from those proposed for submission of state plans, for 
significant state plan revisions, and for when IoPs must be considered 
for inclusion in state plans. The EPA is finalizing the remaining 
timelines as proposed. The EPA determined that these timelines will 
appropriately balance the need to reasonably accommodate the processes 
generally required by states and the EPA to develop, evaluate, and 
adopt plans to effectuate the EG with the need to ensure that 
designated facilities control emissions of dangerous pollutants as 
expeditiously as reasonably possible, consistent with the health and 
welfare-based objectives of CAA section 111(d). A summary of the 
timelines finalized in this action is shown in Table 1.
    The final subpart Ba timelines are applicable to any final EG 
published pursuant to CAA section 111(d) after July 8, 2019, including, 
if finalized, those recently proposed to regulate GHG emissions from 
sources in the oil and natural gas industry (86 FR 63110, November 15, 
202187 and FR 74702, December 6, 2022) and those proposed to regulate 
GHG emissions from fossil fuel-fired electric generating units (88 FR 
33240, May 23, 2023), to the extent that the final EGs do not contain 
provisions superseding any of these timelines in subpart Ba.\17\
---------------------------------------------------------------------------

    \17\ Under each of these EGs the EPA proposed to supersede the 
15-month state plan submittal timeline in proposed subpart Ba based 
on the size and complexity of the source sectors at issue.

Table 1--Final 40 CFR Part 60, Subpart Ba, Timeline Compared With Those Initially Proposed, Vacated From Subpart
                                             Ba, and From Subpart B
----------------------------------------------------------------------------------------------------------------
                                    2023 Subpart Ba     2022 Subpart Ba    Subpart Ba (2019)
          Process step                   final             proposal        vacated timelines   Subpart B (1975)
----------------------------------------------------------------------------------------------------------------
State Plan submittal after        18 months.........  15 months.........  36 months.........  9 months.
 publication of EG in the
 Federal Register.
State Plan completeness           60 days after       60 days after       *6 months after     N/A.
 determination.                    State Plan          State Plan          State Plan
                                   submission.         submission.         submission.
State Plan evaluation...........  12 months after     12 months after     12 months after     4 months after
                                   completeness.       completeness.       completeness.       State Plan
                                                                                               submittal
                                                                                               deadline.
EPA Federal Plan promulgation...  12 months after     12 months after     24 months after     6 months after
                                   failure to submit   failure to submit   finding of          State Plan
                                   or disapproval.     or disapproval.     failure to submit   submittal
                                                                           or disapproval.     deadline.
Requirements for Increments of    If compliance is    If compliance is    If compliance is    If compliance is
 Progress after submittal          >20 months.         >16 months.         >24 months.         >12 months.
 deadline.
----------------------------------------------------------------------------------------------------------------
* Although the timeline for the state plan completeness determinations was not vacated, the EPA has evaluated
  this timeline light of the court vacatur of the related timelines.

    As described in greater detail in section II. of this preamble, the 
D.C. Circuit's vacatur of the extended timelines in subpart Ba was 
based both on the EPA's failure to substantiate the necessity for the 
additional time at each step of the administrative process, and the 
EPA's failure to address how those extended implementation timelines 
would impact public health and welfare. Accordingly, the EPA has 
evaluated these factors and is finalizing timelines, as described in 
the following sections, based on the minimum administrative time 
reasonably necessary for each step in the implementation process, thus 
minimizing impacts on public health and welfare by proceeding as 
expeditiously as reasonably possible while accommodating the time 
needed for states or the EPA to develop an effective plan. This 
approach addresses both aspects of the ALA decision because the EPA and 
states will take no longer than necessary to develop and adopt plans 
that impose requirements consistent with the overall objectives of CAA 
section 111(d).
    The EPA acknowledges these timelines are not identical to those for 
SIPs under CAA section 110. This is consistent with the requirement of 
CAA section 111(d) that the EPA promulgate a procedure ``similar'' to 
that of CAA section 110, rather than an identical procedure. This is 
also consistent with the ALA decision, which requires the EPA to 
``engage meaningfully with the different scale'' of CAA section 111(d) 
and 110 plans. 985 F.3d at 993. In proposing the revised timelines, the 
EPA evaluated each step of the state plan implementation process to 
independently determine the appropriate duration needed to accomplish a 
given step as part of the overall process. After receiving comments on 
the proposed timelines, the EPA again evaluated each step in light of 
the new information; the timelines being finalized in this action 
represent the Agency's revised assessment of the most reasonably 
expeditious timelines that are appropriate to provide as a default for 
EGs under these generally applicable implementing regulations.
    The EPA recognizes that, under certain circumstances, the timelines 
being finalized in this action may not fit the needs of a specific EG 
because of the specific characteristics of an EG. The EPA will address 
source category-specific circumstances or facts that are not 
accommodated by the timelines of subpart Ba through a specific EG. 
Examples of circumstances that may require consideration for different

[[Page 80487]]

timelines could include EGs that require states to perform extensive 
engineering and/or economic analyses before submitting their plans; EGs 
with an exceptional need to expedite implementation (e.g., in order to 
address immediate health and welfare impacts); EGs that apply to an 
extraordinary number of disparate designated facilities; or EGs that 
are novel and/or unusually complex. For situations like these, 40 CFR 
60.20a(a)(1) provides that an EG may supersede any aspect of the 
implementing regulations, including the implementation timelines. It is 
within the EPA's discretion to determine whether a proposed change in 
implementation time may be justified within an individual EG based on 
these or other appropriate factors. For EGs that supersede 
implementation timelines, the EPA will, in the EG, both provide a 
justification for the differing timelines and address how the change in 
timeline will impact health and welfare.
1. State Plan Submission Timelines
    This section discusses the amount of time states will have to 
submit plans and plan revisions to the EPA following the publication of 
a final or revised EG in the Federal Register. As described in further 
detail in section III.E of this preamble, under CAA section 111(d), the 
EPA first determines a BSER and the degree of emission limitation for 
designated facilities and promulgates these determinations in an EG. 
CAA section 111(a)(1), 40 CFR 60.22a(b)(5). It is then each state's 
obligation to submit a plan to the EPA which establishes standards of 
performance based on the EG for each designated facility. See CAA 
section 111(d)(1), 40 CFR 60.24a(c). The implementing regulations 
promulgated in 1975 under subpart B provide that states have 9 months 
to submit a state plan after publication of a final EG. 40 CFR 
60.23(a)(1). In 2019, the EPA promulgated subpart Ba and provided 3 
years for states to submit plans or plan revisions for subsequently 
promulgated or revised EGs, consistent with the timelines provided for 
submission of SIPs pursuant to CAA section 110(a)(1). This 3-year 
timeframe was vacated by the D.C. Circuit in the ALA decision, and thus 
currently there is no applicable deadline for state plan submissions 
and revisions required under EGs subject to subpart Ba.
    As laid out in the notice of proposed rulemaking and summarized 
below, in evaluating the appropriate timeline for plan submittal to 
replace the vacated provisions in subpart Ba, the EPA reviewed steps 
that states need to carry out to develop, adopt, and submit a state 
plan to the EPA, and its history in implementing EGs under the timing 
provisions of subpart B. The EPA further evaluated the statutory 
deadlines and processes for relatively comparable state plans under CAA 
section 129, and attainment planning SIPs submitted pursuant CAA 
sections 189(a)(2)(B) and 189(b)(2) for the 2012 National Ambient Air 
Quality Standards (NAAQS) for fine particulate matter 
(PM<INF>2.5</INF>). 78 FR 3085 (January 15, 2013). Finally, the EPA 
incorporated consideration of the ALA decision addressing expediency in 
implementation of EGs for protection of public health and welfare.
    To develop a CAA section 111(d) state plan, a state must complete a 
series of steps to ensure that the plan will meet all applicable 
requirements. Subpart Ba specifies the elements that must be included 
in a state plan submission (see 40 CFR 60.24a, 60.25a, 60.26a) as well 
as certain processes that a state must undertake in adopting and 
submitting a plan (see 40 CFR 60.23a). In addition to the requirements 
of these implementing regulations, there are also state-specific 
processes applicable to the development and adoption of a state plan, 
including the administrative processes (e.g., permitting processes, 
regulatory development, legislative approval) necessary to develop and 
adopt enforceable standards of performance. State plan development 
generally involves several phases, including providing notice that the 
state agency is considering adopting a rule; taking public comment; and 
approving or adopting a final rule. The process required to formally 
adopt a rule at the state level differs from state to states.\18\
---------------------------------------------------------------------------

    \18\ In many states, the agency must submit its rule to a 
particular independent commission or the legislature for review and 
approval before the rule is finally adopted. Generally, adopted 
rules are filed with a state entity, such as the secretary of state, 
and eventually published in a register and placed into the state's 
administrative code. State law establishes when an adopted rule is 
effective.
---------------------------------------------------------------------------

    As previously mentioned, subpart B provides 9 months for states to 
submit plans after publication of a final EG. The EPA's review of 
state's timeliness for submitting CAA section 111(d) plans under the 9-
month timeline indicated that most states either did not submit plans 
or submitted plans that were substantially late.\19\ The EPA also noted 
that the plans submitted under subpart B were not subject to additional 
requirements for meaningful engagement and consideration of RULOF, 
which may add time to the state development process relative to plans 
developed and submitted under subpart B. For these reasons, the EPA 
found that 9 months is not a reasonable amount of time for most states 
to adequately develop a plan for an EG.
---------------------------------------------------------------------------

    \19\ The EPA reviewed the information available in 40 CFR part 
62. The supporting information reviewed is available at Docket ID 
No. EPA-HQ-OAR-2021-0527. Part 62 codifies the Administrator's 
approval and disapproval of state plans for the control of 
pollutants and facilities under CAA section 111(d), and under CAA 
section 129 as applicable, and the Administrator's promulgation of 
such plans or portions of plans thereof.
---------------------------------------------------------------------------

    To help inform the proposal for the state plan submission deadline, 
the EPA also reviewed CAA section 129's statutory deadline and 
requirements for state plans, and the timeliness and responsiveness of 
states under CAA section 129 EGs. CAA section 129 references CAA 
section 111(d) in many instances, creating considerable overlap in the 
functionality of the programs. The processes for CAA sections 111(d) 
and 129 are similar in that states are required to submit plans to 
implement and enforce the EPA's EGs. However, there are some key 
distinctions between the two programs, most notably that CAA section 
129(b)(2) specifies that state plans be submitted no later than 1 year 
from the promulgation of a corresponding EG, whereas the statute does 
not specify a particular timeline for state plan submissions under CAA 
section 111(d). Moreover, CAA section 129 plans are required by statute 
to be at least as protective as the EPA's EGs, without exception. CAA 
section 129(b)(2). While CAA section 111(d) permits states to take into 
account remaining useful life and other factors to set less stringent 
standards for particular sources. This suggests that the development of 
a CAA section 111(d) plan could involve more complicated analyses than 
a CAA section 129 plan and that a longer timeframe is likely reasonable 
for state plans under CAA section 111(d) than the 1-year timeframe the 
statute provides under CAA section 129.
    Additionally, the EPA found that a considerable number of states 
have not made timely state plan submissions in response to previous CAA 
section 129 EGs. In instances where states submitted CAA section 129 
plans, a significant number of states submitted plans between 14 to 17 
months after the promulgated EG.\20\ This again suggests that states 
will typically need more than

[[Page 80488]]

one year to develop a state plan to implement an EG.
---------------------------------------------------------------------------

    \20\ The EPA reviewed the information available in 40 CFR part 
62. The supporting information reviewed is available at Docket ID 
No. EPA-HQ-OAR-2021-0527. Part 62 codifies the Administrator's 
approval and disapproval of state plans for the control of 
pollutants and facilities under CAA section 111(d), and under CAA 
section 129 as applicable.
---------------------------------------------------------------------------

    In the 2019 promulgation of subpart Ba, the EPA mirrored CAA 
section 110 by giving states 3 years to submit plans. As previously 
described, the D.C. Circuit faulted the EPA for adopting the CAA 
section 110 timelines without accounting for the differences in scale 
and scope between CAA section 110 and 111(d) plans. Therefore, in 
proposing the revised timelines the EPA closely evaluated other 
statutory deadlines and requirements for state implementation plans to 
determine what is feasible for a CAA section 111(d) state plan 
submission timeline. The EPA specifically focused on statutory SIP 
submission deadlines and requirements in the context of attainment 
plans for the 2012 PM<INF>2.5.</INF> NAAQS under CAA section 189 
because it provided a comparable process. CAA section 189(a)(2)(B) 
requires states to submit attainment planning SIPs within 18 months 
after an area is designated nonattainment and there is a record of 
successful state submittals pursuant to this timeline. The 2012 
PM<INF>2.5.</INF> NAAQS attainment plans were, in most cases, more 
complicated for states to develop when compared to a typical plan that 
may be required under CAA sections 111(d). For example, attainment 
plans require states to determine how to control a variety of sources, 
based on extensive modeling and analyses, in order to bring a 
nonattainment area into attainment of the PM<INF>2.5</INF> NAAQS by a 
specified date. Identification of contributing emission sources and the 
development of effective control strategies can be challenging because 
particulate matter pollution is comprised of both primary emissions and 
secondary particle formation. By contrast, under CAA section 111(d), it 
is clear which designated facilities are subject to a state plan, in 
general what control methods are available for the designated pollutant 
from that facility, and that the standards of performance for these 
sources must reflect the level of stringency for the facility as 
determined by the EG unless a state chooses to account for RULOF.
    Informed by these analyses, the EPA proposed to require that each 
state adopt and submit to the Administrator a plan for the control of 
the designated pollutant(s) to which the EG applies within 15 months of 
publication of a final EG. Some commenters supported the proposed 
timeline based on the need for urgency in achieving the emission 
reductions targeted by an EG. Additionally, some commenters noted that, 
in comparison with NAAQS SIP requirements, states are generally well-
positioned to address the source sectors historically regulated under 
CAA section 111(d) and have access to information about control 
strategies and regulatory approaches for controlling emissions. Most 
commenters on this issue were state agencies or other state-related 
entities that generally expressed the need for a longer state plan 
submittal timeline in order to accommodate state regulatory processes 
associated with plan submittals (i.e., legislative and/or 
administrative state processes), as well as to accommodate technical 
development of the plans and to implement the proposed meaningful 
engagement requirements. Approximately 10 states responded to the EPA's 
request with information about their state processes. The information 
received indicates that states argued that they need anywhere from 15 
months to 36 months to adopt and submit state plans. As discussed 
further below, the EPA is finalizing a state plan submittal timeline of 
18 months. It is doing so after consideration of comments received on 
the proposal and recognizing the need to protect public health and 
welfare. The EPA has determined that 18 months is the appropriate 
timeline for these general implementing regulations; for a generic EG, 
this represents a reasonable balance between providing states 
sufficient time to develop and submit a plan that satisfies the 
applicable requirements and ensuring that the emission reductions 
contemplated in an EG are achieved as expeditiously as practicable. 
Consistent with the existing regulations of subpart Ba, 40 CFR 
60.20a(a)(1), the EPA may supersede this 18-month state plan submittal 
timeline in an individual EG.
    The proposed 15-month submittal timeline was based on the EPA's 
proposed determination that this was a reasonably expeditious deadline 
that would provide states and stakeholders sufficient time to develop 
and submit an approvable state plan. However, based on public comments 
received, we no longer believe that 15 months will provide sufficient 
time to complete the substantive and procedural requirements under 
subpart Ba. For example, the EPA is revising subpart Ba to require that 
states demonstrate meaningful engagement as part of their state plan 
development. While the time needed to conduct meaningful engagement 
will depend highly on the source category, the designated pollutant, 
and the types of impacts associated with designated facilities and 
potential controls, as well as on the pertinent stakeholders under a 
given EG within each state, it is very likely to require additional 
time relative to the existing public notice and hearing requirements 
under CAA section 110 and subpart Ba. We received comments that 15 
months would be insufficient time to identify pertinent stakeholders, 
develop public participation strategies, and conduct outreach and 
engagement. Some commenters also pointed out that adding requirements, 
such as meaningful engagement and RULOF, without a corresponding 
extension of time to develop plans may undermine states' abilities to 
submit timely, approvable plans. While some commenters requested 36 
months to submit state plans, several indicated that a minimum 
timeframe of 18 months would be appropriate for a state plan under a 
generic EG. Given the preponderance of comments suggesting that 15 
months was not a reasonable amount of time to develop an approvable 
state plan and in recognition of the need to promulgate a timeline that 
achieves emission reductions as expeditiously as practicable, the EPA 
believes 18 months is the most reasonable timeline to include in these 
generally applicable implementing regulations.
    The EPA acknowledges that, as commenters asserted, state regulatory 
and legislative processes and resources can vary significantly and 
influence the time needed to develop and submit state plans (e.g., 
legislative procedures and timelines vary by state). Some commenters 
opposed to a shorter state plan submission timeline asserted that they 
need 36 months to complete their administrative and legislative 
processes. However, because the CAA contains numerous, long-standing 
requirements under other programs for states to develop and submit 
plans within 18 months (or fewer),\21\ the EPA believes that states 
should be well positioned to accommodate an 18-month submittal timeline 
for plans under section 111(d). In designing a submittal deadline for 
state plans, it is reasonable to look to what Congress has determined 
are appropriate timelines for SIPs and to assume that states should be 
able to accommodate comparable timelines under CAA section 111(d). 
Indeed, some commenters recommend that the EPA not defer to lengthy 
state administrative processes, and expressed concern that some states 
have adopted, or may adopt, procedures that are longer than necessary 
and that will unnecessarily postpone Federal emission-reduction 
obligations. To this point, extending

[[Page 80489]]

state plan submittal timelines to account for any and all unique state 
procedures would inappropriately delay reductions in emissions that 
have been found under CAA section 111 to endanger health or the 
environment.
---------------------------------------------------------------------------

    \21\ See, e.g., CAA sections 110(k)(5); 129; 179(d)(1); 189.
---------------------------------------------------------------------------

    Some commenters asserted that the ALA decision does not preclude 
the EPA from adopting a 36-month time frame for state plan submittals 
and that the Agency need only justify a longer timelines more fully. 
However, the EPA recognizes that the D.C. Circuit, in ALA, faulted the 
Agency for failing to consider the potential impacts to public health 
and welfare associated with extending planning deadlines. In response, 
the EPA is promulgating a state plan submittal timeline that reflects 
the generally expeditious period of time for states to develop and 
submit a plan per the corresponding emission guidelines that is both 
comprehensive and legally sound. The EPA does not interpret the court's 
direction to require a quantitative measure of impact, but rather 
consideration of the importance of meeting the public health and 
welfare goals when determining appropriate deadlines for implementation 
of regulations under CAA section 111(d). Based on EPA's assessment of 
the time it will take for states to develop and submit plans under 
these general implementing regulations, both in the notice of proposed 
rulemaking and this preamble and after consideration of comments 
received, the EPA has determined that 18 months represents the 
generally expeditious period of time.
    Some commenters stated that reduction of the designated pollutants 
addressed by currently proposed emission guidelines (i.e., GHG) is not 
urgent based on the fraction of global GHG reduced by currently 
proposed emission guidelines, so a longer state plan timeline would be 
justified. The EPA disagrees with the commenters' characterizations of 
the threat posed by elevated concentrations of greenhouse gases in the 
atmosphere. The EPA has determined that greenhouse gas air pollution 
may reasonably be anticipated to endanger public health or welfare \22\ 
and has explained that ``scientific assessments, EPA analyses, and 
documented observed changes in the climate of the planet and of the 
U.S. present clear support regarding the current and future dangers of 
climate change and the importance of GHG emissions mitigation.'' \23\ 
Moreover, subpart Ba applies to any EG promulgated after July 8, 2019, 
not only to the recently proposed EGs addressing GHG emissions from two 
source categories. The EPA regulates source categories, through EGs, 
that emit pollutants the Agency has determined under CAA section 111(d) 
to cause or significantly contribute to an endangerment of public 
health or welfare. Accordingly, consistent with ALA, it is appropriate 
for the EPA to set an expeditious but reasonable schedule in these 
general provisions for state plan development and submission to ensure 
that emission reductions occur in a timely manner.
---------------------------------------------------------------------------

    \22\ See, e.g., 80 FR 64510, 64530 (Oct. 23, 2015).
    \23\ 88 FR 33240, 33252 (May 23, 2023).
---------------------------------------------------------------------------

    Finally, some commenters asserted that if the EPA were to finalize 
the state plan submittal timeline as proposed, the EPA should include a 
mechanism in subpart Ba for states to ask for extensions of the state 
plan submittal deadline. However, as we are providing additional time 
for state plan submittals relative to proposal, we are not providing a 
mechanism for states to request deadline extensions in subpart Ba. 
Additionally, the EPA has the ability to supersede the timelines in 
subpart Ba in individual EGs and will take into account any unique 
considerations that may result in the need for longer or shorter 
timelines on an EG-by-EG basis.
    In summary, while the EPA proposed a 15-month state plan submittal 
timeline, after consideration of comments, the EPA is finalizing 40 CFR 
60.23a(a)(1) to provide an 18-month timeline for the submission of 
state plans following publication in the Federal Register of a final 
EG. The EPA has determined that this is the generally expeditious 
period in which states can create and submit a plan per the EPA's 
corresponding EGs that is both comprehensive and legally sound. In 
considering the appropriate timeline, the EPA has evaluated data from 
previously implemented EGs and the statutory deadlines and data from 
analogous programs (e.g., CAA sections 129 and 189). We have also 
considered comments that some of the requirements the EPA had proposed 
for subpart Ba would require additional time to implement, as well as 
comments asserting that certain states need up to 36 months to complete 
their administrative and legislative processes. While a reasonable 
state plan submittal timeline must provide states sufficient time to 
develop and submit plans that comport with the applicable requirements, 
the EPA also believes that state processes should be able to 
accommodate an 18-month timeline because the CAA already contains 
numerous deadlines that require SIP submissions to be developed and 
submitted to the Agency within 18 or fewer months. Thus, this finalized 
timeline should provide states reasonable time to adopt and submit 
approvable plans, and is also sufficiently expeditious to protect 
against significant adverse impacts to health and welfare resulting 
from foregone emission reductions during the state planning process. 
Providing states sufficient time to develop feasible implementation 
plans for their designated facilities that adequately address public 
health and environmental objectives also ultimately helps ensure more 
timely implementation of an EG, and therefore achievement in actual 
emission reductions, than would an unattainable deadline. Because 18 
months is an expeditious time period, it follows that the EPA has 
appropriately considered the potential impacts to public health and 
welfare associated with this extension of time by providing no more 
time than the states reasonably need to ensure a plan is comprehensive 
and timely.
    The EPA is also finalizing the proposed amendment to 40 CFR 
60.27a(a) replacing the word ``shorten'' with ``amend''. The 
applicability provision at 40 CFR 60.20a(a)(1) states that ``each 
emission guideline may include specific provisions in addition to or 
that supersede requirements of this subpart.'' However, the existing 
provision in 40 CFR 60.27a(a) only provides for the Administrator to 
``shorten the period for submission of any plan or plan revision or 
portion thereof.'' To make these two provisions consistent in light of 
the timelines for plan submission finalized in this action, the EPA is 
replacing the word ``shorten'' with ``amend.'' One commenter opposed 
the amendment stating there is no regulatory certainty for the state in 
state plan submittal if the Administrator can simply change the 
timeline as he deems necessary. However, the appropriate timeline would 
undergo notice and comment rulemaking as the EG is proposed and 
finalized so that states would have sufficient notice of the timeline. 
To the extent the EPA considers deviating from this 18-month timeframe 
in promulgating an EG in the future, the EPA will consider the public 
health and welfare impacts associated with extending the state plan 
submission timeline, consistent with the D.C. Circuit's direction in 
ALA.
    The EPA is also finalizing two amendments to 40 CFR 60.28a(a), 
which addresses plan revisions by the state. First, the EPA is 
finalizing the proposed clarification that meaningful engagement 
requirements apply to any significant plan revision by the state. 
Second, the EPA is finalizing revisions

[[Page 80490]]

to the timeline for state plan revisions required in response to a 
revised emission guideline. At proposal, the EPA indicated in the 
revised regulatory text that it was proposing to shorten the timeline 
for state plan revisions in this specific circumstance from three years 
to 12 months.\24\ The EPA received comments on this proposed revision 
asserting that the same process-related challenges that apply to 
initial state plan submissions, including conducting meaningful 
engagement and RULOF procedures and working through states' 
administrative and legislative processes, also apply to state plan 
revisions. Commenters requested that the EPA extend the timeline for 
state plan revisions in response to revised emission guidelines; one 
commenter specifically requested that the EPA leave it at 36 months. 
However, the EPA anticipates that, in most instances, plan revisions 
required in response to a revised emission guideline would be narrower 
in scope than the initial state plan and would not require states to 
reevaluate standards of performance or conduct significant new 
analysis. For example, the EPA may revise an emission guideline to 
provide for additional or updated monitoring or compliance protocols or 
to clarify applicability provisions. In such instances, the full period 
of time provided for initial state plan development and submission 
would not be necessary.\25\ Thus, the EPA believes it is reasonable to 
set a default timeline for the submission of state plan revisions in 
these general implementing guidelines that is shorter than the timeline 
for initial state plan submission. Because the EPA is providing an 
additional three months for state plan submission in this final rule 
relative to the proposed timeline (18 months versus 15 months), it is 
finalizing a timeline for the submission of state plan revisions in 
response to a revised emission guideline of fifteen months, which is 
also three months longer than the twelve months proposed. Additionally, 
in recognition that some state plan revisions in response to a revised 
emission guideline may in fact be more complex or necessitate 
additional analysis or rulemaking, the EPA is finalizing the provision 
at 40 CFR 60.28a(a) to allow the Agency to determine a different 
timeline for the submission of revised state plans, which it will 
provide in the revised emission guideline.
---------------------------------------------------------------------------

    \24\ 
``Docket_memo_outlining_proposed_changes_to_regulatory_text.pdf,'' 
available at <a href="https://www.epa.gov/stationary-sources-air-pollution/adoption-and-submittal-state-plans-designated-facilities-40-cfr">https://www.epa.gov/stationary-sources-air-pollution/adoption-and-submittal-state-plans-designated-facilities-40-cfr</a>, as 
well as Docket ID No. EPA-HQ-OAR-2021-0527-0002.
    \25\ The EPA's response to comments that the state plan 
submission timelines should accommodate every state's unique 
administrative and legislative processes is also relevant here and 
is provided elsewhere in this section of the preamble.
---------------------------------------------------------------------------

2. Timeline for the EPA To Determine Completeness of State Plans
    Once a state plan has been submitted to the EPA, the EPA reviews 
the plan for ``completeness'' to determine whether it includes certain 
elements necessary to ensure that the EPA can substantively evaluate 
the plan. The EPA determines completeness by comparing the state's 
submission against the administrative and technical criteria specified 
in subpart Ba to determine whether the submission contains the 
specified elements (see 40 CFR 60.27a(g)(2) for completeness criteria). 
The timeline to make completeness determinations in the version of 
subpart Ba the EPA promulgated in 2019 mirrored the language for SIPs 
in CAA section 110(k)(1)(B): ``Within 60 days of the Administrator's 
receipt of a plan or plan revision, but no later than 6 months after 
the date, if any, by which a State is required to submit the plan or 
revision, the Administrator shall determine whether the minimum 
criteria [for completeness] have been met.'' Like CAA section 
110(k)(1)(B), subpart Ba also provided that a state plan would be 
deemed complete by operation of law if the EPA had not made an 
affirmative determination by the date 6 months after receipt of the 
plan submission. 40 CFR 60.27a(g)(1).
    After a state plan is deemed complete through either an affirmative 
determination or by operation of law, the EPA will act on the state 
plan submission through notice-and-comment rulemaking. The timeline for 
the EPA to act on a state plan submission runs from the date a 
submission is deemed complete; more on this timeline can be found in 
section III.A.3. of this preamble.
    If a state plan submission does not contain the elements required 
by the completeness criteria, the EPA would find that the state has 
failed to submit a complete plan and notify the state through a letter. 
The determination of incompleteness treats the state as if the state 
has made no submission at all. The determination that a submission is 
incomplete and that the state has failed to submit a plan is 
ministerial in nature.
    As part of the EPA's overall effort to set implementation timelines 
under CAA section 111(d) that are as expeditious as possible, the EPA 
proposed to revise the timing element of the completeness review at 40 
CFR 60.27a(g)(1). In light of the ministerial nature of the 
completeness determination, the EPA proposed a maximum of 60 days from 
receipt of the state plan submission for the EPA to make a 
determination of completeness. The EPA additionally proposed that any 
state plan or plan revision submitted to the EPA that has not received 
a completeness determination within 60 days of receipt, shall on that 
date be deemed, by operation of law, to meet the completeness criteria, 
which will trigger the EPA's obligation to take substantive action on 
the state plan. Sixty days provides an expeditious timeframe for the 
EPA to evaluate state plans for completeness and to notify the states 
of the determination. Because the EPA may be required to evaluate up to 
50 state plans during this period, in addition to plans submitted by 
territories and tribes, the EPA explained at proposal that it did not 
find that this timeframe could reasonably be shortened any further.
    While most commenters supported the 60-day completeness period, 
some commenters expressed concern that a state plan that is 
automatically deemed complete by operation of law as of the allotted 60 
days could cause unnecessary turbulence in state plan implementation if 
the plan is later disapproved by the EPA due to missing information. 
Other commenters noted that if a plan is determined to be incomplete, a 
60-day period will not allow states sufficient time to correct the 
deficiency and submit a complete plan. First, the EPA notes that the 
completeness determination is ministerial in nature and does not affect 
the Agency's subsequent responsibility and authority to substantively 
review a state plan submission against the requirements of the Act and 
applicable regulations, including this subpart Ba and the relevant EG. 
That is, a determination that a state plan is complete does not signify 
that it necessarily satisfies the substantive requirements. The 
commenters fail to explain how deeming a state plan submission complete 
by operation of law, in this case after 60 days, and later finding it 
does not satisfy an applicable requirement is a new phenomenon or would 
cause unnecessary turbulence in state plan implementation. Rather, a 
shorter period for deeming plans complete by operation of law would be 
less disruptive than a longer period in this instance because the EPA 
will complete its substantive evaluation of the plan sooner and the 
state will have notice earlier on of any deficiencies. Additionally, 
because states may submit plan revisions at any time, states may

[[Page 80491]]

work collaboratively with the EPA on any portions of a plan identified 
as being deficient during both the completeness determination period 
and the period for the EPA's substantive review of the plan. Thus, 
again, a shorter completeness determination period that includes a 
cutoff for deeming submissions complete by operation of law merely 
keeps the state plan review process moving expeditiously and does not 
foreclose any state opportunities to correct or supplement submissions 
at any point in the EPA's review process.
    Moreover, the EPA intends to review for completeness as soon as 
possible after submittal. Although the EPA believes that it will be 
able to provide a timely completeness determination for most if not all 
state plan submissions, providing for completeness through operation of 
the law will help ensure that the EPA's action on state plans does not 
significantly delay plan processing or implementation.
    The EPA is therefore finalizing the completeness provision at 40 
CFR 60.27a(g)(1) as proposed. The EPA notes that if the EPA determines 
a plan is incomplete, the EPA is required to promulgate, through 
notice-and-comment rulemaking, a Federal plan. See sections III.A.4. 
and III.B. for the discussion and final amendments associated with the 
timeline and triggers of the Federal Plan respectively. If a state 
submits a plan prior to the state plan submission deadline and the EPA 
also makes a determination that the plan is incomplete prior to that 
deadline, the EPA will treat the state as if the state has made no 
submission at all, but this determination does not yet trigger further 
action by the EPA. Instead, because the state still has an opportunity 
to submit a complete plan before the state plan submission deadline, 
the EPA's authority to promulgate a Federal plan is only triggered if 
the state fails to timely submit a new plan to replace the incomplete 
plan by the state plan deadline.
3. Timeline for the EPA's Action on State Plans
    After a state plan has been determined to be complete or is deemed 
complete by operation of law, CAA section 111(d) provides that the EPA 
must evaluate whether the plan is ``satisfactory''; that is, whether 
the components of the plan meet all the requirements of the statute, 
these implementing regulations, and the corresponding EG. The EPA does 
so by evaluating a plan (or plan revision) to determine whether the 
plan or plan revision is approvable, in part or in whole (see section 
III.D.1. of this preamble for discussion on partial plan approvals), 
through a notice-and-comment rulemaking process. After the EPA proposes 
an action on a state plan submission (e.g., approval, partial approval/
partial disapproval, disapproval) and reviews comments on the proposed 
action, the EPA will finalize its action on the plan. If the EPA 
approves a state plan, the standards of performance and other 
components of that state plan become federally enforceable. If the 
state plan is disapproved, in part or in whole, the EPA is obligated to 
promulgate a Federal plan for designated facilities within the state 
that were covered by the disapproved portions of the plan (see section 
III.A.4. of this preamble below for the EPA's timeline to publish a 
Federal plan).
    Subpart B requires the EPA to take action on applicable state plans 
(e.g., approve or disapprove) within 4 months after the date required 
for submission. 40 CFR 60.27(b). In the development of subpart Ba, the 
EPA contended that 4 months was an inadequate time to review and take 
action on state plans and therefore instead provided a deadline of 12 
months for final action on a state plan (mirroring the maximum time 
permitted under CAA section 110(k)(1)(2) for the EPA's action on 
complete SIPs). 84 FR 32520, July 8, 2019. In the ALA decision, the 
D.C. Circuit vacated this revised timeline in subpart Ba on the basis 
that the EPA did not adequately justify the extended timeframes and did 
not consider the public health and welfare impacts of extending the 
implementation times. As is discussed below, the EPA has in this 
rulemaking closely evaluated the process, steps, and timeframes for the 
EPA to substantively review and act upon each state plan submission 
through a public notice-and-comment rulemaking process. After 
considering the time anticipated to be necessary for generally 
expeditious EPA action on state plans, the EPA again proposed that it 
must take final action on a state plan or plan revision submission 
within 12 months after a plan is determined to be complete or becomes 
complete by operation of law.\26\
---------------------------------------------------------------------------

    \26\ The deadlines for the EPA action under subpart Ba would 
apply to any state plan submission regardless of when it is 
submitted.
---------------------------------------------------------------------------

    In the notice of proposed rulemaking, the EPA explained that the 
first step it takes once a state plan submittal has been deemed 
``complete'' under 40 CFR 60.27a(g) is for an intra-agency workgroup to 
review the plan components to determine whether they conform to the 
applicable regulatory requirements. The workgroup may require a broad 
range of expertise in legal, technical, and policy areas, potentially 
including attorneys, engineers, scientists, economists, air monitoring 
experts, health and welfare analysts, and/or policy analysts from 
across a variety of the EPA programs. After review and coordination, 
the workgroup then develops recommendations for approval or disapproval 
of each plan component and presents them to Agency decision-makers for 
review. Once the Agency completes its internal decision-making process, 
the workgroup proceeds to prepare a written notice of proposed 
rulemaking. The notice of proposed rulemaking contains the EPA's legal, 
policy, and technical bases for its proposed action on a state plan 
submission, which must be thoroughly developed and explained in writing 
to provide clear and concise information and reasoning to support the 
public in understanding the Agency's decision and the justification for 
that decision, and so that the public may provide informed comments on 
the proposal. The EPA may further develop technical support documents 
as record support for the proposal. The draft proposed rulemaking and 
any record support then undergo a multi-layered review process across 
the EPA offices and levels of management before being processed for 
signature. The process to evaluate the state plan, draft a proposed 
action on a CAA section 111(d) state plan, and get the proposed action 
edited, reviewed, and signed typically requires a minimum of between 6 
to 8 months to complete. The signed notice of proposed rulemaking is 
then submitted for publication in the Federal Register, which may 
require several weeks of review and processing prior to publication.
    The publication of the proposed rulemaking triggers the start of a 
public comment period of at least 30 days with possible extension, if 
requested by commenters. Because of the types of sources and pollutants 
regulated under CAA section 111(d), the EPA reasonably anticipates that 
many of its proposed actions on state plans will garner significant 
public interest from individuals, industry, states, and environmental 
and public health advocates. After completion of the comment period, 
the EPA then reviews all comments and determines whether, based on any 
information provided by the comments, it should alter its proposed 
action or further augment the legal, policy, and technical rationales

[[Page 80492]]

supporting that action. Comments received on a proposed action may 
include technical information that was not available to the EPA at the 
time of proposal. In the event technical data are received as part of 
comments on the proposed action, the EPA would then be required to 
review the new data and evaluate whether and how it should affect the 
EPA's proposed conclusions regarding the state plan. If a substantive 
comment is raised that merits reconsideration of the EPA's proposed 
action, the EPA may determine that it is necessary to revise and 
repropose its action on the state plan or it may go to the state for 
more information to help the Agency determine how to proceed.
    Once this review of comments is complete, the workgroup drafts and 
presents updated recommendations for action for internal review and 
consideration by Agency decision-makers. Once the Agency completes its 
internal decision-making process, the workgroup then drafts a notice of 
final rulemaking on the plan submission, which includes responses to 
comments, any necessary record support, and may also include final 
regulatory text. The draft final action is then reviewed by senior 
management and other interested EPA offices within the Agency prior to 
signature of the final rulemaking approving or disapproving, in whole 
or in part, a state plan. It is reasonable to permit at least 4 to 7 
months for evaluation of the comments received, any necessary technical 
analysis, decision-making, and drafting and review of the final action.
    The duration of each step in this deliberative process varies. The 
amount of time the EPA needs to review a state plan submission and the 
time it needs to finalize a notice of proposed rulemaking depends in 
part on the plan's complexity and the nature of the technical, policy, 
and legal issues that it implicates. For example, a state plan 
submission that includes standards of performance for dozens of 
facilities on different compliance schedules would be more complex and 
time consuming to review than a plan that simply establishes standards 
of performance reflecting the presumptive level of stringency for all 
sources. Similarly, the amount of time needed to respond to comments 
and issue a final rulemaking depends in part on the number and type of 
comments received on the EPA's proposed rulemaking. Additionally, the 
EPA reasonably anticipates that it will be required to review multiple 
plan submissions at a given time, and these phases of review for a 
given plan are impacted by the EPA's review of other state plan 
submissions, as the EPA will need to assure its review across multiple 
plans and regional offices is consistent from a legal, technical, and 
policy perspective.
    While some commenters supported 12 months as an expeditious 
timeframe for the EPA review and action on state plan submittals, 
several noted that 12 months may be insufficient. These commenters 
asserted that the EPA must meaningfully evaluate and take action on a 
state plan and a 12-month timeframe may be too short for this process. 
However, as detailed in the discussion above, the EPA has a mapped out 
the time necessary to take action on a generic plan submission and 
believes that 12 months is the most expeditious and therefore the most 
appropriate period to provide for these generally applicable 
implementing regulations. Additionally, the EPA has completed hundreds 
of actions on CAA section 110 SIPs within 12 months over the past 4 
years. Given that the EPA may choose to supersede the requirements of 
subpart Ba as necessary in an individual EG, we believe that providing 
the shortest period here is consistent with considering health and 
welfare impacts by designing timelines to achieve state plan 
implementation as expeditiously as reasonably possible.
    The EPA is therefore finalizing as proposed 40 CFR 60.23a(b) to 
provide that it will take action on a state plan or plan revision 
within 12 months of a determination of a complete plan pursuant to 40 
CFR 60.27a(g). This is a reasonably expeditious timeframe to 
accommodate the EPA action on a state plan or plan revision submission 
and the considerations described above, while ensuring that an EG is 
expeditiously implemented. The process and steps described in this 
action highlight the fact that it would be unreasonable, if not 
impossible, to accomplish all of the steps in a legally and technically 
sound manner within a 4-month timeframe as required under subpart B. 
Particularly, any proposed action by the EPA has to be open for public 
comment for at least 30 days, and therefore the 4-month timeline 
provided in subpart B only gave the EPA 3 months to do the substantive 
work of both the proposed and final actions, including evaluating the 
state plan submission, drafting preamble notices, responding to 
comments, and developing record support at both the proposed and final 
action stages. A 12-month timeframe after a plan is determined to be 
complete more reasonably accommodates the process and steps described 
in this action.\27\
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    \27\ While the EPA would have the discretion to act on a state's 
submission more quickly than 12 months where specific circumstances 
allow (e.g., where there are no public comments on the proposed 
action), the EPA does not believe that it would be reasonably 
possible to act significantly more quickly than 12 months in most 
cases.
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    As explained at proposal, the EPA recognizes that the court in ALA 
faulted the Agency for failing to consider the potential impacts to 
public health and welfare associated with extending planning deadlines. 
The EPA does not interpret the court's direction to require a 
quantitative measure of impact, but rather consideration of the 
importance of the public health and welfare goals of CAA section 111(d) 
when determining appropriate deadlines. Because 12 months is an 
adequate period of time in which the EPA can both expeditiously act on 
a plan submission and ensure that its action is technically and legally 
sound, it follows that the EPA has appropriately considered the 
potential impacts to public health and welfare associated with this 
extension of time by providing no more time than the EPA reasonably 
needs to ensure a plan submission contains appropriate and protective 
emission reduction measures. If the EPA does not have adequate time to 
evaluate a state plan submission, its ability to ensure the plan 
contains appropriate measures to satisfactorily implement and enforce 
the standards necessary to comply with the EG may be compromised, which 
would in turn compromise the EPA's ability to ensure that the public 
health and welfare objectives of the EG are satisfied. Although several 
commenters noted that the review of some plans may require a more in 
depth analysis, the EPA believes 12 months is a both reasonable and 
expeditious timeframe to evaluate and act on most state plans. 
Accordingly, in order to ensure that the public health and welfare 
objectives of CAA section 111 are timely realized, and consistent with 
the direction in ALA, the EPA does not believe it would be appropriate 
to finalize a timeframe longer than 12 months for the EPA action on 
state plans.
4. Timeline for the EPA To Promulgate a Federal Plan
    CAA section 111(d)(2) provides that the EPA has the same authority 
to prescribe a Federal plan for a state that fails to submit a 
satisfactory plan as it does for promulgating a FIP under CAA section 
110(c). Accordingly, the EPA's obligation to promulgate a Federal plan 
is triggered in three situations: where a state does not submit a plan 
by the plan

[[Page 80493]]

submission deadline; where the EPA determines a portion or all of a 
state plan submission did not meet the completeness criteria and the 
time period for state plan submission has elapsed and, therefore, the 
state is treated as having not submitted a required plan; and where the 
EPA disapproves a state's plan. 40 CFR 60.27a(c). The EPA is finalizing 
as proposed the revisions to 40 CFR 60.27a(c) providing that the Agency 
will promulgate a Federal plan at any time within 12 months of any of 
the triggers in Sec.  60.27a(c)(1) and (2) (see section III.B. of this 
preamble for discussion).\28\
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    \28\ The EPA has discretion to address its obligation to 
promulgate a Federal plan in a variety of ways for states that do 
not have an approved state plan. For example the EPA may initially 
promulgate a single Federal plan that applies to all appropriate 
states and then update that Federal plan as necessary to accommodate 
the inclusion of other states that trigger the need for a Federal 
plan in the future (e.g., a Federal plan that applies to states that 
fail to submit a plan can be updated to include applicability for 
states that later have a plan disapproved); or the EPA may 
promulgate separate Federal plans each time its authority to do so 
has been triggered (e.g., the EPA will promulgate a Federal plan for 
all states that fail to submit a plan and another Federal plan for 
all states that have their plan disapproved).
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    The EPA is obligated to promulgate a Federal plan for states that 
have not submitted a plan by the submission deadline. Once the 
obligation to promulgate a Federal plan is triggered, it can only be 
tolled by the EPA's approval of a state plan. If a Federal plan is 
promulgated, a state may still submit a plan to replace the Federal 
plan. A Federal plan under CAA section 111(d) is a means to ensure 
timely implementation of EGs, and a state may choose to accept a 
Federal plan for their sources rather than submit a state plan. While 
the EPA encourages states to timely submit plans for EGs, there are no 
sanctions associated with failing to timely submit an approvable plan 
or with the implementation of a Federal plan.\29\
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    \29\ CAA section 179 provides that sanctions should be applied 
in states that fail to submit approvable SIPs for certain specified 
requirements for NAAQS implementation. The EPA has not promulgated 
any similar sanctions provisions governing the submission of state 
plans pursuant to section 111(d).
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    The original implementing regulations in subpart B provided the EPA 
with 6 months to promulgate a Federal plan once its obligation to do so 
was triggered. 40 CFR 60.27(d). When the EPA promulgated subpart Ba in 
2019, it concluded that this amount of time was insufficient and 
consequently extended the time for the EPA to promulgate a Federal plan 
to 24 months, mirroring the timeframe permitted for promulgation of a 
FIP under CAA section 110. 84 FR 32520, July 8, 2019. In the ALA 
decision, the D.C. Circuit vacated this revised timeline in subpart Ba 
on the basis that the EPA did not adequately justify the extended 
timeframe and did not consider the health and welfare impacts of 
extending the implementation timeframe.
    At proposal, the EPA reevaluated the process, steps, and timeframes 
for the EPA to promulgate a Federal plan through a public notice-and-
comment rulemaking process and proposed a 12-month timeframe to 
promulgate a Federal plan once its obligation to do so is 
triggered.\30\ As explained in the notice of proposed rulemaking, a 
Federal plan must meet the requirements of CAA section 111(d) and 
therefore contain the same components as a state plan, namely standards 
of performance for designated facilities and measures that provide for 
the implementation and enforcement of such standards. CAA section 
111(d)(2)(B) also explicitly requires the EPA to consider RULOF in 
promulgating a standard of performance under a Federal plan. 
Additionally, Federal plans containing standards of performance are 
subject to the procedural requirements of CAA section 307(d), such as 
the requirements for proposed rulemaking and opportunity for public 
hearing. CAA section 307(d)(1)(C). The EPA's regulations at 40 CFR 
60.27a implement these various statutory requirements and contain 
general regulatory requirements for the EPA's promulgation of a Federal 
plan. The process, and steps for the EPA to promulgate a Federal plan 
consistent with these applicable requirements is described in the 
following paragraphs.
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    \30\ The EPA reviewed the information available in 40 CFR part 
62 associated with the promulgation of Federal Plans under CAA 
section 111(d). The supporting information reviewed is available at 
Docket ID No. EPA-HQ-OAR-2021-0527. Under the provisions of CAA 
section 111 and subpart B, the EPA promulgated Federal plans for 
municipal solid waste landfills EG 40 CFR part 60, subpart Cc 
(Federal plan codified at 40 CFR part 62, subpart GGG) and municipal 
solid waste landfills EG 40 CFR part 60, subpart Cf (Federal plan 
codified at 40 CFR part 62, subpart OOO).
    The EPA also reviewed information available in 40 CFR part 62 
associated with the promulgation of Federal Plans under CAA 129. The 
supporting information reviewed is available at Docket ID No. EPA-
HQ-OAR-2021-0527. Under the provisions of CAA sections 111 and 129 
and subpart B, the EPA has promulgated Federal plans for large 
municipal waste combustors EG 40 CFR part 60, subpart Cb (Federal 
plan codified at 40 CFR part 62, subpart FFF); small municipal waste 
combustors EG 40 CFR part 60, subpart BBBB (Federal plan codified at 
40 CFR part 62, subpart JJJ); hospital, medical, and infectious 
waste incinerators EG 40 CFR part 60, subpart Ce (Federal plan 
codified at 40 CFR part 62, subpart HHH); commercial and industrial 
solid waste incinerators EG 40 CFR part 60, subpart DDDD (Federal 
plan codified at 40 CFR part 62, subpart III) and sewage sludge 
incinerators EG 40 CFR part 60, subpart MMMM (Federal plan codified 
at 40 CFR part 62, subpart LLL).
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    Once the EPA's obligation to promulgate a Federal plan is 
triggered, the EPA establishes an intra-agency workgroup to develop the 
rulemaking action to address that obligation. The workgroup first 
develops recommendations for the components of the Federal plan to be 
proposed, and on legal, policy, and technical rationales that support 
the recommendations. These components are identified in subpart Ba as 
well as in the corresponding EG and are generally the same as those 
required for a state plan. One of these fundamental components is the 
determination of standards of performance for designated facilities. 
Based on the requirements of CAA sections 111(d) and 111(a)(1), these 
standards must generally reflect the degree of emission limitation 
achievable through application of the BSER as determined by the EPA as 
part of the EG. Depending on the form of the BSER and the degree of 
emission limitation in a particular EG, the EPA may need to do 
additional work to calculate standards of performance that reflect this 
level of stringency. For example, an EG may translate the degree of 
emission limitation into a presumptive standard in the form of 
numerical emission rates, which a Federal plan could simply adopt as 
the requisite standards of performance. However, if an EG provides the 
degree of emission limitation in a form other than presumptive 
numerical standards, and the EPA may need to calculate appropriate 
standards of performance in the context of a Federal plan. Further, CAA 
section 111(d)(2) requires the EPA to consider RULOF for sources in the 
source category in setting standards of performance as part of a 
Federal plan which requires the EPA to identify whether the remaining 
useful lives of relevant designated facilities, among other appropriate 
factors, merit the EPA establishing different standards of performance 
for those facilities. The development of a Federal plan may also 
necessitate that the EPA determine appropriate testing, monitoring, 
reporting, and recordkeeping requirements to implement the standard if 
the EG does not provide presumptive requirements to address those 
aspects of implementation. Further, the EPA will need to consider 
associated compliance times for designated facilities in circumstances 
where they are not provided by an EG, or in cases where a standard of 
performance is adjusted to account for RULOF. There may also be 
situations where IoPs are warranted,

[[Page 80494]]

and the EPA will correspondingly need to identify and determine the 
appropriate IoPs. The development of a Federal plan with these 
components, or of significant revision to a Federal plan, will also 
include elements of meaningful engagement, as finalized in this action 
including revision to section 40 CFR 60.29a and as further described in 
section III.C. of this preamble.
    Once the recommendations for each component are developed, the 
workgroup presents them to Agency decision-makers for review. After the 
Agency completes its internal decision-making process, the workgroup 
proceeds to prepare a written notice of proposed rulemaking. The 
proposal must include the following elements, as required by CAA 
section 307(d)(3): the factual data on which the proposed rulemaking is 
based; the methodology used in obtaining the data and in analyzing the 
data; and the major legal interpretations and policy considerations 
underlying the proposed rulemaking. These elements must be thoroughly 
developed and explained in the proposal to meaningfully provide the 
public adequate information to comment on the proposal. The EPA may 
further develop a technical support document as record support for the 
proposal.
    The draft proposed rulemaking and any record support are then 
reviewed by the relevant EPA offices and processed for signature. The 
signed notice of proposed rulemaking is then submitted for publication 
in the Federal Register. To develop the proposed Federal plan 
rulemaking, establish unique standards for RULOF, allow review of 
materials by senior management, go through an interagency review 
process and have the package signed typically requires a minimum of 
between six to nine months to complete.
    As previously noted, the EPA's promulgation of a Federal plan is 
subject to the requirements of CAA section 307(d), which includes 
providing the public with an opportunity to provide an oral 
presentation at a public hearing. CAA section 307(d)(5). The Federal 
Register Act requires the EPA to provide sufficient notice of a public 
hearing, which (in the absence of a different time specifically 
prescribed by the relevant Act of Congress) is satisfied if the EPA 
provides at least 15 days' notice. 44 U.S.C. 1508. Section 307(d)(5) of 
the CAA further provides that the EPA must keep the record for the 
proposed action open for public comment for 30 days after any public 
hearing for the submission of rebuttal and supplemental information. 
Because the EPA reasonably expects to provide notice of the required 
public hearing at the time its proposed action is published in the 
Federal Register, in order to allow for both a 15-day notice of the 
public hearing and a subsequent 30-day comment period on the open 
record, the EPA should allow for at least 45 days for public comment on 
the notice of proposed action.
    As with state plans, because of the types of sources and pollutants 
regulated under CAA section 111(d), the EPA reasonably anticipates that 
many of its proposed actions on a Federal plan will garner significant 
public interest from individuals, industry, states, and environmental 
and public health advocates. After completion of the comment period, 
the EPA then reviews all comments and determines whether, based on any 
comment, it should alter any components of the proposed Federal plan, 
or further augment the legal, policy, and technical rationales 
supporting that proposed action. Additionally, in the EPA's experience, 
comments may include technical information that was not in front of the 
Agency at the time of proposal. In the event technical data are 
received as part of comments on the proposed action, the EPA would then 
be required to review the new data and evaluate whether and how it 
should affect the EPA's proposed Federal plan. If a substantive comment 
is raised that merits reconsideration of any component in the proposed 
Federal plan, the EPA would need to repropose the plan.
    Once this review of comments is complete, the workgroup drafts and 
presents updated recommendations for internal review and decision 
making. Once the Agency completes its internal decision-making process, 
the workgroup then drafts a notice of final rulemaking, which includes 
responses to comments and any necessary record support, and final 
regulatory text as the Federal plan directly regulates certain 
designated facilities. The draft final action is then reviewed by 
relevant offices within the Agency prior to signature of the final rule 
promulgating the Federal plan. The EPA typically anticipates that the 
process of reviewing comments received, making corresponding changes to 
the rulemaking, and promulgating the final Federal plan to be between 4 
and 8 months.
    The duration of each step in this deliberative process varies. The 
amount of time the EPA needs to develop, propose, and finalize a 
Federal plan depends in part of the plan's complexity and the nature of 
the technical, policy, and legal issues that it implicates. For 
example, some states needing a Federal plan may have thousands, if not 
hundreds of thousands, of designated facilities for which the EPA will 
need to establish standards of performance and implementation measures, 
while other Federal plans may be significantly smaller in scale. 
Similarly, the amount of time needed to respond to comments and issue a 
final rule depends in part on the number and type of comments received 
on the EPA's proposed rulemaking. Additionally, the EPA reasonably 
anticipates that it may need to promulgate a Federal plan for multiple 
states at a given time, which can amplify the amount of time and work 
needed.
    In response to this proposed timeline, several commenters asserted 
that the EPA should provide itself more than the proposed 12 months to 
promulgate a Federal plan, with some commenters noting additional time 
needed for the EPA to provide for meaningful engagement and 
consideration of RULOF. However, based on the assessment as presented 
in the preceding paragraphs, recognizing that much of the evaluation 
needed for promulgating a Federal plan will be performed by the EPA 
during development of the EG, considering the need for expeditious 
implementation of EGs, and noting that RULOF is expected to only be 
needed for certain limited circumstances, the EPA is finalizing the 
requirement that it promulgate a Federal plan within 12 months once its 
obligation to do so is triggered, i.e., either the date required for 
submission of a state plan (for states that fail to submit a complete 
plan) or the date the EPA disapproves a state's plan. As with the other 
timelines in subpart Ba, the EPA may supersede the 12 month timeline 
for a Federal plan as appropriate depending on the circumstances of the 
applicable EG.
    The EPA also recognizes that some commenters stated that the EPA 
need not and should not wait for its Federal plan obligation to be 
``triggered'' to begin developing such a plan. The EPA agrees that 
early development of the Federal plan, where possible before the EPA's 
obligation is formally triggered, could provide the EPA with additional 
time to meet this deadline. The EPA notes that to further streamline 
the timeline associated to the issuance of a Federal plan, the EPA is 
also finalizing the proposed change to the trigger for the EPA's 
obligation and timeline to provide a Federal plan for states that do 
not submit a timely plan. That discussion is found in section III.B. of 
this preamble.

[[Page 80495]]

    Thus, the EPA is finalizing as proposed the revisions to 40 CFR 
60.27a(c) providing that the Agency will promulgate a Federal plan at 
any time within 12 months of any of the triggers in Sec.  60.27a(c)(1) 
and (2). While retaining the authority to supersede this timeline in an 
EG if appropriate, the EPA has determined that 12 months reasonably 
accommodates the amount of time that the EPA needs to undertake the 
process, steps, and the considerations described above, while ensuring 
that an EG is expeditiously implemented. The process and steps 
described earlier that the EPA must be taken in promulgating a Federal 
plan highlight the fact that it would be unreasonable, if not an 
impossibility, to accomplish all of the steps in a legally and 
technically sound manner within a 6-month timeframe as required under 
subpart B.\31\
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    \31\ While the EPA would have the discretion to promulgate a 
Federal plan more quickly than 12 months where specific 
circumstances allow (e.g., where there are no public comments on the 
proposed action), the EPA does not believe that would be reasonably 
possible to act significantly more quickly than 12 months in most 
cases.
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    As with the EPA's finalized timeline to act on state plan 
submissions, 12 months is generally the period of time in which the EPA 
can both expeditiously complete a Federal plan and ensure it is 
technically and legally sound. Therefore, this time period considers 
potential impacts to public health and welfare by giving the EPA a 
reasonably expeditious timeframe to promulgate a Federal plan that 
contains appropriate and protective emission reduction measures. This 
is especially true in the context of a Federal plan, where there is 
otherwise no state plan in place that is adequately protective of 
public health and welfare. If the EPA does not have adequate time to 
promulgate a Federal plan, its ability to ensure the plan contains 
appropriate measures to satisfactorily implement and enforce the 
standards necessary to comply with the EG may be compromised, which 
would in turn compromise the EPA's ability to ensure that the public 
health and welfare objectives of the EG are satisfied.
    The EPA notes that a state may submit a plan to replace a Federal 
plan, even after the state plan submission deadline. However, once the 
EPA's authority and obligation to promulgate a Federal plan has been 
triggered, the act of a state submitting a plan alone does not abrogate 
the EPA's authority or obligatory timeline to promulgate a Federal 
plan. Only an approved state plan can supplant an already promulgated 
Federal plan or abrogate the EPA's responsibility to timely promulgate 
a Federal plan. Where a state submits a late plan, that may have the 
practical effect of concurrent timelines for promulgation of the 
Federal plan and the EPA's action on that late state plan; the EPA is 
not obligated to act on a late state plan prior to promulgating a 
Federal plan (40 CFR 60.27a(d)).
5. Timeline for Increments of Progress (IoPs)
    As part of the EPA's statutory responsibility to determine the 
degree of emission limitation achievable through application of the 
BSER and to include it in an EG, the EPA also determines in an EG ``the 
time within which compliance with standards of performance can be 
achieved.'' 40 CFR 60.22a(b)(5). Accordingly, state plans must include 
both standards of performance for designated facilities and compliance 
schedules for achieving those standards of performance.\32\
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    \32\ ``Each plan shall include standards of performance and 
compliance schedules.'' 40 CFR 60.24a(a).
---------------------------------------------------------------------------

    In 1975, the EPA defined in subpart B ``compliance schedule'' as 
``a legally enforceable schedule specifying a date or dates by which a 
source or category of sources must comply with specific standards of 
performance contained in a plan or with any increments of progress to 
achieve such compliance.'' In subpart B the EPA also defined 
``increments of progress'' as steps to achieve compliance which must be 
taken by an owner or operator of a designated facility including: (1) 
submittal of a final control plan for the designated facility to the 
appropriate air pollution control agency; (2) awarding of contracts for 
emission control systems or for process modifications, or issuance of 
orders for the purchase of component parts to accomplish emission 
control or process modification; (3) initiation of on-site construction 
or installation of emission control equipment or process change; (4) 
completion of on-site construction or installation of emission control 
equipment or process change; and (5) final compliance. The EPA adopted 
these definitions without change when it promulgated subpart Ba in 
2019.
    Subpart B requires that each state plan include emission standards 
and compliance schedules. 40 CFR 60.24a. In addition, subpart B 
specifies in 40 CFR 60.24(e)(1) that any compliance schedule extending 
more than 12 months from the date required for submittal of the plan 
must include legally enforceable increments of progress to achieve 
compliance for each designated facility or category of facilities. 
Unless otherwise specified in the applicable subpart, increments of 
progress must include, where practicable, each increment of progress 
specified in Sec.  60.21(h) and must include such additional increments 
of progress as may be necessary to permit close and effective 
supervision of progress toward final compliance. The provision in 40 
CFR 60.24(e)(1) was amended in 2000.\33\ The 2000 amendments to 40 CFR 
60.24(e)(1) added the words ``Unless otherwise specified in the 
applicable subpart'' to the requirements associated with IoPs. The EPA 
described in the 1999 proposal that the purpose of this amendment was 
to allow the EPA, in a specific subpart, discretion in the number of 
IoPs that a designated facility must meet. Without this amendment 
subpart B required designated facilities to meet all five IoPs 
specified in the IoP definition. In the 1999 proposal the EPA 
recognized that while for some categories of designated facilities the 
five increments are appropriate, all five IoPs may not be necessary to 
ensure compliance for other categories of designated facilities. 
Therefore, EPA proposed and finalized amendments to 40 CFR 60.24(e) to 
allow discretion and flexibility in establishing IoPs for a particular 
subpart.
---------------------------------------------------------------------------

    \33\ 65 FR 76380 (Dec 6, 2000).
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    In promulgating subpart Ba in 2019, the EPA largely carried over 
the requirement of subpart B at 40 CFR 60.24(e)(1) in a new provision 
40 CFR 60.24a(d).\34\ However, to align the trigger of IoPs in 40 CFR 
60.24a(d) to the updated timelines it was finalizing in subpart Ba, in 
2019 the EPA adopted a timeframe trigger for IoPs of 24-months instead 
of the 12-months as in subpart B. Per the finalized 2019 subpart Ba 
provision at 40 CFR 60.24a(d), unless otherwise specified in the 
applicable subpart, any compliance schedule extending more than 24 
months from the date required for submittal of the plan must include 
legally enforceable IoPs to achieve compliance for each designated 
facility or category of facilities. As discussed previously, the D.C. 
Circuit vacated the extended implementation timelines in subpart Ba, 
including the 24-months timeline trigger for IoPs in 40 CFR 
60.24a(d).\35\
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    \34\ In promulgating Ba in 2019, the EPA specified that for 
``For those provisions that are being carried over from the existing 
implementing regulations into the new implementing regulations, the 
EPA is not intending to substantively change those provisions from 
their original promulgation and continues to rely on the record 
under which they were promulgated.'' 84 FR 32520 (July 8, 2019).
    \35\ Petitioners did not challenge, and the court did not vacate 
in ALA, the substantive requirement for or definition of increments 
of progress.

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[[Page 80496]]

    To address the vacated timeline trigger of IoPs in 40 CFR 
60.24a(d), the EPA proposed in 2022 that, unless otherwise specified in 
the applicable subpart, any compliance schedule extending more than 16 
months from the date required for submittal of the plan must include 
legally enforceable IoPs to achieve compliance for each designated 
facility or category of facilities. The proposed 16-month trigger for 
IoPs overlapped with the EPA's proposed 60-day completeness review 
following a state plan submittal and the proposed 12-month period for 
the EPA to review and take action on the state's plan and would have 
further provided a 2-month buffer after the timeline for the EPA's 
action on a state plan (occurring no later than 14 months after the 
plan submission deadline under these general implementing regulations). 
In the 2022 proposal the EPA recognized the proposed 16-month timeframe 
trigger for IoPs provided a 2-month time buffer between the EPA's 
action on a state plan and the trigger of IoPs. As proposed, this 2-
months buffer was less than both the 8 months previously provided by 
subpart B and the 6-month buffer provided by the vacated subpart Ba 
timeline.
    In response to the proposed 16-month IoPs timeframe trigger, 
several commenters asserted the proposed 2-month buffer from the time 
of the EPA's action on a state plan to the trigger of IoPs is not 
practically workable. Some commenters argued that, assuming that there 
could be a required increment of progress right after the 16-months 
trigger and the EPA has 14 months to take final action on a state plan, 
the designated facilities would have only two months to comply with the 
requirement after it becomes federally enforceable. Other commenters 
similarly noted that if final compliance was required just after the 
16-month trigger, designated facilities would similarly have only two 
months to complete any IoPs. The commenters explained that it is unduly 
burdensome for sources to expend resources on developing hypothetical 
final control plans and committing resources to construction projects 
that may ultimately be inconsistent with the EPA's action on a state 
plan. Several commenters that opposed the 16-months proposed timeframe 
trigger for IoPs suggested that the EPA extend the trigger to more than 
24-months, consistent with the previously vacated subpart Ba. Some 
commenters argued that 24 months is the minimum time necessary to 
develop control strategies, design plans, procure construction 
materials and/or equipment, and complete the installations often 
necessary for compliance. Other commenters suggested that a 10-month 
buffer from the EPA action on a state plan to the trigger for IoPs 
would also be acceptable and even preferred, should the EPA miss its 
approval deadlines.
    After consideration of comments and accounting for the discretion 
that EPA has in establishing IoPs in a particular EG, the EPA is 
extending the buffer associated with the trigger of IoPs from 2 months 
to 6 months, so that, unless otherwise specified in the applicable 
subpart, any compliance schedule extending more than 20 months from the 
date required for submittal of the plan must include legally 
enforceable IoPs to achieve compliance for each designated facility or 
category of facilities.
    The EPA emphasizes that the timeline for the trigger for IoPs 
merely signals when the gap between state plan submission and final 
compliance is long enough that the EPA must consider whether IoPs are 
necessary. It is not the case that any EG with a final compliance date 
after the trigger for consideration of IoPs will necessarily require 
all of the increments listed in 40 CFR 60.21a(h). The EPA is required, 
per 40 CFR 60.22a(b)(4), to include within an EG ``[i]ncremental 
periods of time normally expected to be necessary for the design, 
installation, and startup of identified control systems.'' These 
incremental periods are determined within an EG through notice and 
comment rulemaking, providing an opportunity for appropriate 
consideration of the reasonable time needed for the designated 
facilities to meet the requirements associated with the pertinent 
standards of performance. As provided by subpart Ba, the EPA will 
determine in an individual EG whether IoPs are needed to achieve final 
compliance with the standards of performance and, if increments are 
needed, how many and the timeframes associated with compliance of such 
IoPs. However, the EPA also believes that the trigger requirement for 
IoPs should attach to plans that contain compliance periods that are 
longer than the period provided for the EPA's review of such plans and 
in addition provide a reasonable buffer after the EPA has acted on such 
plans so that designated facilities could reasonably comply with 
required increments. After further consideration, the EPA believes that 
a default 2-month buffer between an EPA action on a state plan and a 
hypothetical compliance deadline for a full set of IoPs is not 
generally sufficient.
    In 2019, the EPA promulgated a trigger for IoPs of 24-months given 
that it was finalizing a period of up to 18 months for its action on 
state plans (i.e., 12 months from the determination that a state plan 
submission is complete, which could occur up to six months after 
receipt of the state plan). The 24-month period would have provided a 
6-month buffer for designated sources to comply with any IoPs after the 
EPA acted on state plans. In this action, the EPA is finalizing a 
trigger for consideration of IoPs that provides the same buffer 
provided by the EPA in the 2019 vacated increment of progress timeline 
trigger. The EPA believes a 6-month buffer is generally needed to 
appropriately balance ensuring designated facilities control emissions 
of harmful pollutants as expeditiously as reasonably possible with the 
need for designated facilities to have reasonable certainty regarding 
their federally enforceable regulatory compliance obligations with 
sufficient time before those obligations are due. In addition, the EPA 
determines that the 6-months buffer provides a reasonable time to come 
into compliance with any potential increment of progress when 
compliance date that extends more than 20 months from the date required 
for submittal of the plan. Per the EPA's assessment of the comments and 
in light of the ALA court decision, the EPA determines that a 6-month 
timeframe buffer before the trigger for requirements associated with 
IoPs provides is the most reasonable expeditious period of time 
associated with the requirements for IoPs in 40 CFR 60.24a(d). While 
some commenters argued more time is necessary to develop control 
strategies, design plans, procure construction materials and/or 
equipment, and complete the installations often necessary for 
compliance, the final requirements in subpart Ba does not express the 
EPA's intent to require that states require designated facilities to 
complete all potential IoPs in a 6-month period.
    Several commenters also urged the EPA to link the timelines for 
IoPs to the date on which the EPA takes final action on a state plan, 
instead of with the state plan submittal deadline. However, given that 
there will typically be a single final compliance date specified in an 
EG but the dates on which the EPA takes final action on individual 
states plans are likely to be many and varied based on, inter alia, 
when each state plan was submitted to the Agency, such an approach 
would create unnecessary confusion about whether IoPs must be

[[Page 80497]]

implemented and potentially uneven application of the requirement for 
state plans to include IoPs. It could also create a perverse incentive 
for states to delay submission of their state plans. Additionally, the 
timeline for IoPs initiates from the state plan submittal deadline 
because it is the earliest instance when all standards of performance 
in all timely state plans will be enforceable. It is a requirement of 
state plans, when submitted, to be enforceable at the state level and 
thus all designated facilities subject to a standard of performance in 
a state plan will have assurance of their requirements at the state 
level and can start planning for compliance while the EPA reviews and 
acts on the state plan.
    The timeline for IoPs finalized in this action will ensure 
standards of performance are implemented as expeditiously as possible 
so that the intended emission reductions are achieved, and the public 
health and welfare are protected.

B. Federal Plan Authority and Timeline Upon Failure To Submit a Plan

    CAA section 111(d)(2)(A) provides that the EPA has the same 
authority ``to prescribe a plan for a State in cases where the State 
fails to submit a satisfactory plan as he would have under section 
7410(c) of this title in the case of failure to submit an 
implementation plan.'' The original implementing regulations in subpart 
B provide that the EPA is to ``promptly prepare and publish proposed 
regulations setting for a plan, or portion thereof, for a State if:'' a 
state fails to submit a plan within the time prescribed, the state 
fails to submit a plan revision within the time prescribed or the 
Administrator disapproves a state plan or plan revision or any portion 
thereof. 40 CFR 60.27(c). Subpart B further requires the EPA to 
promulgate the plan proposed under paragraph (c) ``within six months 
after the date required for submission of a plan or plan revision . . . 
unless, prior to such promulgation, the State has adopted and submitted 
a plan or plan revision which the Administrator determines to be 
approvable.'' 40 CFR 60.27(d).
    In promulgating subpart Ba in 2019, the EPA incorporated language 
in the provisions associated with the Actions by the Administrator in 
40 CFR 60.27a(c) from CAA sections 110(c)(1)(A) and 110(k)(1)(B) 
addressing the circumstances which trigger the EPA's authority under 
CAA section 111(d)(2) for promulgating a Federal plan. Specifically, in 
2019 the EPA adopted language at 40 CFR 60.27a(c)(1) that requires the 
EPA to promulgate a Federal plan after it ``[f]inds that a state fails 
to submit a required plan or plan revision or finds that the plan or 
plan revision does not satisfy the minimum criteria under'' 40 CFR 
60.27a(g), i.e., the completeness criteria (emphasis added). Pursuant 
to the amendments being finalized in this action, the EPA will be 
required, under 40 CFR 60.27a(g), to determine whether completeness 
criteria have been met no later than 60 days after the date by which a 
state is required to submit a plan (see section III.A.2. of this 
preamble). These provisions under subpart Ba taken together would mean 
that, no later than 60 days after the state plan submission deadline 
has passed, the EPA must make a finding (often referred to as a 
``finding of failure to submit'') as to whether any states have failed 
to submit a plan that meets the completeness criteria, and such finding 
is what triggers the EPA's obligation and timeline to promulgate a 
Federal plan.\36\
---------------------------------------------------------------------------

    \36\ Note that this procedure does not address circumstances 
when the EPA promulgates a Federal plan for states whose plan is 
disapproved. In these circumstances, the state has submitted a plan 
so no finding of failure to submit is issued. The EPA's obligation 
and timeline to promulgate a Federal plan in this instance arises 
from the EPA's disapproval based on its conclusion that the state 
plan submission was unsatisfactory.
---------------------------------------------------------------------------

    At proposal, the EPA acknowledged that in the CAA section 110 
context, it has not always timely met its obligation to issue a finding 
of failure to submit, which in turn delays the timing for when the EPA 
promulgates a FIP to achieve the necessary emission reductions. 
Accordingly, the EPA proposed to streamline the process in the subpart 
Ba context to ensure that the emission reductions anticipated by the EG 
are realized in a timely way through the promulgation of any necessary 
Federal plan. In particular, the EPA proposed revisions to 40 CFR 
60.27a(c)(1) consistent with the framework and requirements that have 
been effective in subpart B since 1975. As proposed the Administrator 
would issue a Federal plan if a state fails to submit a plan within the 
time prescribed without requiring the EPA to affirmatively issue a 
finding of failure to submit before the EPA's obligation to issue a 
Federal plan is triggered.
    As explained in the notice of proposed rulemaking, as part of 
evaluating ways to streamline the steps leading to promulgation of a 
final Federal plan, the EPA considered the value and role of issuing 
findings of failure to submit in this process. A finding of failure to 
submit was intended to serve three purposes under subpart Ba, 
consistent with its purpose under CAA section 110: to notify the public 
of the status of state plan submissions (i.e., providing transparency 
to the process); to notify states that the EPA has not received a plan; 
and to formally start the clock for the EPA to promulgate a Federal 
plan. While these concepts may have some utility as part of the overall 
Federal plan development and implementation process, the EPA finds that 
in the CAA section 111(d) context there is minimal value in coupling 
the notification aspects of a finding of failure with the initiation of 
the clock for the EPA to promulgate a Federal plan. These aspects are 
not inextricably linked to one another in that nothing about a formal 
finding of failure to submit substantively informs the development of a 
Federal plan; the EPA has the information it needs to know which states 
have and have not submitted complete plans. By decoupling the timeline 
from the finding of failure to submit, the EPA's obligation to 
promulgate a Federal plan can be triggered without the interim step and 
potential lag associated with issuing a formal finding of failure to 
submit notification. By removing this interim process, the EPA will be 
required to promulgate the Federal plan more expeditiously, and, in 
turn, overall implementation of the corresponding EG will be timelier. 
Finalizing this amendment is also consistent with the spirit of the ALA 
decision, where the D.C. Circuit emphasized the need for implementation 
timelines that consider potential impacts on public health and welfare. 
By expeditiously and efficiently promulgating a Federal plan and by 
removing an interim step of a finding of failure, the EPA is further 
addressing the potential impacts of implementation times on health and 
welfare.
    Some commenters requested that the EPA retain a separate ``finding 
of failure to submit'' action as the trigger for starting the timeline 
on a Federal plan. They note that the ``finding of failure'' provides 
notification to the states, regulated community, and public of the 
failure, as state submissions can be difficult to track. Commenters 
also note that the need to first provide the finding also provides 
additional time for the states to submit plans or revisions. One 
commenter noted that the EPA should retain the ``finding of failure to 
submit'' procedure and avoid establishing automatic deadlines for 
itself on a schedule that, based on past experience, it is almost 
certain to miss.
    First, the EPA notes that where a state has failed to timely submit 
a state plan, the absence of a state plan submission should be easy to 
track for the state,

[[Page 80498]]

regulated community, and public; many, if not all, states maintain 
public websites on which they document their submissions to the EPA. 
The EPA expects that notification and tracking capabilities will also 
generally be much improved through the use of electronic submittal (see 
section III.F. of this preamble) and increasing public access to online 
information.
    Second, the EPA stresses that the purpose of using a finding of 
failure to submit as the trigger for Federal plan development was not 
to give states time to develop and submit their state plans in excess 
of the regulatorily allotted timeframes. In this action, the Agency is 
finalizing timeframes for state plan submissions that are reasonably 
achievable and that may be superseded where necessary. Decoupling the 
finding of failure to submit and the trigger of state plan development 
should therefore not impact states' abilities to develop and submit 
satisfactory state plans. States always have the ability to submit 
state plans and state plan revisions at any time. Additionally, while 
the EPA recognizes that it has not always provided timely Federal 
plans, the Agency does not believe that changing the starting point for 
its Federal plan clock from a finding of failure to submit to the day 
after state plan submission are due will have an appreciable impact on 
its ability to do so. Notably, the trigger for its timeline will not 
change the length of time the EPA has to promulgate a plan. While the 
commenter implies that the EPA would use the time before it has made a 
finding of failure to submit to start working on a Federal plan, it is 
not reasonable to assume that the Agency is in a position to start 
developing such a plan before it has had a chance to determine if a 
state plan is incomplete. Therefore, the EPA is finalizing its proposed 
approach of removing from subpart Ba a finding of failure to submit as 
the trigger for starting the timeline for a Federal plan. The approach 
being finalized in subpart Ba is consistent with the framework and 
requirements that have been effective in subpart B since 1975. The 
regulatory text at 40 CFR 60.27a(c)(1) is being revised slightly 
relative to proposal to clarify that the 12-month clock starts running 
the day after the state plan submission deadline for instances in which 
a state fails to submit a plan or plan revision by that deadline, and 
the day after state plan submissions would be deemed complete by 
operation of law (i.e., 60 days after the state plan submission 
deadline) for instances in which a state plan has been submitted but 
deemed incomplete.\37\ These revisions merely clarify the EPA's intent 
at proposal to ensure that all states and stakeholders have a clear 
understanding of the timeline for promulgation of a Federal plan. As 
discussed in section III.A.4. of this preamble, the EPA is finalizing 
the requirement that it will have 12 months from the state plan 
deadline to promulgate a Federal plan for states that do not submit a 
plan. Note, the EPA is also finalizing a deadline of 12 months to 
promulgate a Federal plan for states whose plans are disapproved, but 
in those instances the EPA's obligation and timeline to provide a 
Federal plan are triggered off of its disapproval of a state plan.
---------------------------------------------------------------------------

    \37\ As discussed in section III.A.2., if a state submits a plan 
but that submission does not contain the elements required by the 
completeness criteria, the EPA would find that the state has failed 
to submit a complete plan and notify the state through a letter. 
That letter is for notification only and, although the EPA intends 
to issue such letters expeditiously, it does not start the clock for 
a Federal plan.
---------------------------------------------------------------------------

    The EPA notes that this amendment to subpart Ba does not affect the 
EPA's obligation under CAA section 110(c) to promulgate a FIP within 2 
years of making a finding that a state has failed to submit a complete 
SIP. In the case of the CAA section 110, the obligation for the EPA to 
first make a finding of failure to submit is derived from the statute, 
whereas nothing in CAA section 111(d) obligates the EPA to make such a 
finding before promulgating a Federal plan. CAA section 111(d)(1) 
directs the EPA to promulgate a process ``similar'' to that of CAA 
section 110, rather than a process that is identical. Therefore, the 
fact that a finding of failure to submit serves as the legal predicate 
for the EPA's obligation to issue a FIP under CAA section 110 does not 
mean that the EPA is also required to treat such a finding as a legal 
predicate for a Federal plan under CAA section 111(d).
    In summary, while recognizing that a finding of failure to submit 
can have value in notifying states and the public of the status of 
plans, the EPA does not find that it is integral to the process of 
promulgating a Federal plan for states that do not submit plans. 
Further, the requirement for the EPA to issue a finding of failure can 
result in significant unwarranted delays in EG implementation. The EPA 
is therefore finalizing the proposed amendment that this finding will 
no longer be the event that triggers the timeline for the EPA's 
issuance of a Federal plan. 40 CFR 60.27a(c)(1). While the EPA will not 
publish a formal finding of failure to submit in the Federal Register, 
the Agency will notify the states and the public of a failure to submit 
expeditiously following the state plan submission deadline or deadline 
for EPA determinations of completeness, as applicable. Additionally, 
the EPA notes that the completeness criteria in 40 CFR 60.27a(g) were 
promulgated in 2019, 84 FR 32520, 32578 (July 8, 2019), and, while the 
EPA is removing finding of failure to submit as the trigger for 
promulgation of a Federal rule, it emphasizes that states may have 
discussions with the EPA and submit revised state plans at any point. 
That is, there remains within this framework ample opportunity for 
iterative state plan development.
    The regulatory provision at 40 CFR 60.27a(c)(1), as finalized, is 
consistent with the requirement that applies regarding the EPA's 
issuance of a Federal plan under subpart B. In subpart B (i.e., 
applicable to implementing regulations for CAA section 111(d) EGs 
promulgated on or prior to July 8, 2019, and currently applicable 
implementing regulations for CAA section 129 EGs), the EPA's obligation 
to promulgate a Federal plan is triggered by the state plan submission 
deadline.

C. Outreach and Meaningful Engagement

    The fundamental purpose of CAA section 111 is to reduce emissions 
from certain stationary sources that cause or significantly contribute 
to air pollution which may reasonably be anticipated to endanger public 
health or welfare. Therefore, a key consideration in the state's 
development of a state plan, in any significant plan revision,\38\ and 
in the EPA's development of a Federal plan or significant plan 
revision, pursuant to an EG promulgated under CAA section 111(d) is the 
potential impact of the proposed plan requirements on public health and 
welfare. A robust and meaningful public participation process is 
critical to ensuring that the full range of these impacts are 
understood and considered.
---------------------------------------------------------------------------

    \38\ A significant state plan revision includes, but is not 
limited to, any revision to standards of performance or to measures 
that provide for the implementation or enforcement of such 
standards.
---------------------------------------------------------------------------

    States often rely primarily on public hearings as the foundation of 
their public engagement in their state plan development process because 
a public hearing has always been explicitly required pursuant to the 
applicable regulations. The existing provisions in subpart Ba (40 CFR 
60.23a(c) through (f)) detail the public participation requirements 
associated with the development of a state plan. Per these implementing 
regulations, states must

[[Page 80499]]

provide certain notice of, and conduct one or more public hearings on, 
their state plan before such plan is adopted and submitted to the EPA 
for review and action.\39\ The EPA is not reopening these basic and 
long-standing public hearing requirements in this rulemaking. However, 
as explained in the notice of proposed rulemaking,\40\ robust and 
meaningful public involvement in the development of a plan should 
sometimes go beyond the minimum requirement to hold a public hearing 
depending on who may be most affected by and vulnerable to the impacts 
being addressed by the plan. Because the CAA section 111(d) program 
addresses existing facilities, some of which may be decades old, it is 
possible that impacted communities may not have had a voice in the 
process when the source was originally constructed, or previous 
outreach may have focused largely on engaging the industry. The EPA 
proposed amendments to 40 CFR part 60, subpart Ba, were intended to 
strengthen the public participation provisions and ensure that all 
affected members of the public, not just a particular subset, have an 
opportunity to participate in the pollution control planning process by 
requiring meaningful engagement with pertinent stakeholders in the 
state's development of a state plan, in any significant plan revision, 
and in the EPA's development of a Federal plan pursuant to an EG 
promulgated under CAA section 111(d).
---------------------------------------------------------------------------

    \39\ States may cancel a public hearing if no request for one is 
received during the required notification period. 40 CFR 60.23a(e).
    \40\ 87 FR 79176, 79190-92 (Dec. 23, 2022).
---------------------------------------------------------------------------

    The EPA proposed to add meaningful engagement with pertinent 
stakeholders in 40 CFR 60.23a(i) and 60.27a(f) and add the definition 
of meaningful engagement and of pertinent stakeholders in 40 CFR 
60.21a. The EPA proposed to define meaningful engagement as it applies 
to this subpart as timely engagement with pertinent stakeholder 
representation in the plan development or plan revision process. Such 
engagement must not be disproportionate nor favor certain stakeholders. 
It must include the development of public participation strategies to 
overcome linguistic, cultural, institutional, geographic, and other 
barriers to participation to assure pertinent stakeholder 
representation, recognizing that diverse constituencies may be present 
within any particular stakeholder community. It must include early 
outreach, sharing information, and soliciting input on the state plan. 
The EPA also proposed to evaluate the approvability of state plans 
based on the components of the meaningful engagement definition.
    The EPA proposed that pertinent stakeholders ``. . . include, but 
are not limited to, industry, small businesses, and communities most 
affected by and vulnerable to the impacts of the plan or plan 
revision.'' Additionally, to ensure that a robust and meaningful public 
engagement process occurs as the states develop their CAA section 
111(d) plans, the EPA proposed to amend the requirements in 40 CFR 
60.27a(g) to include, as part of the completeness criteria, the 
requirement for states to demonstrate in their plan submittal how they 
provided meaningful engagement with the pertinent stakeholders. The 
state would be required to provide, in their plan submittal: (1) a list 
of the pertinent stakeholders identified by the state; (2) a summary of 
engagement conducted; and (3) a summary of the stakeholder input 
received.
    Most of the comments received on the proposed meaningful engagement 
requirements and proposed definitions were supportive of including 
meaningful engagement in the development of the state plans. Several 
commenters stated that they supported the inclusion of environmental 
justice considerations in Federal programs, including requirements for 
meaningful engagement. In particular, one commenter stated that 
outreach and meaningful engagement with stakeholders, specifically 
including communities most affected by and vulnerable to the pollution 
that would be reduced by a state plan, is an important and overdue step 
to ensuring that impacted communities have a voice in a process that 
directly impacts their health and welfare. While several commentors 
affirmed the EPA's authority to require meaningful engagement, some 
commenters said that the EPA lacks such authority. One of the 
commenters argued that the EPA lacks authority to require consideration 
of public health and welfare under CAA section 111(d) because CAA 
section 111 was devised as a technology-based approach to controlling 
emissions from stationary sources, not one predicated on the setting of 
standards directly and exclusively based on public health and welfare 
needs. One of the commenters stated the EPA lacks the authority to pass 
judgment on state plans submitted pursuant to CAA section 111(d) based 
on public engagement and argued that the only statutory requirement in 
CAA section 110 (which 111(d) cross-references) is the requirement that 
states provide ``reasonable notice and public hearings'' prior to 
adoption of a state plan.
    Several commenters supported the EPA's definition of meaningful 
engagement and the proposed meaningful engagement requirement. 
Additionally, some comments supported the state plan approvability 
requirements for meaningful engagement and recommended that the EPA 
also require an accounting of what states have done with stakeholder 
input and how that input was used or not used in their state plan.
    Several commenters expressed the need for additional resources in 
order to conduct meaningful engagement, both for states and 
communities. Some of the comments stated that the EPA needs to consider 
how these increased requirements may strain already limited state 
resources. One commenter said that resources needed to fulfill the 
requirements for meaningful engagement, including costs associated with 
identifying and contacting stakeholders, renting of rooms or spaces for 
multiple public meetings, travel, and associated staff time, will be 
significant and burdensome to states.
    There were several comments requesting clarification on the 
definition of meaningful engagement, and on the proposed approvability 
requirements for meaningful engagement. Some commenters requested that 
the rule provide more clarity on what states need to do for meaningful 
engagement and provide a clear path for states to develop an approvable 
meaningful engagement demonstration. Similarly, other commenters 
recommended the EPA establish a more detailed definition and provide 
examples of best practices for states to follow in implementing 
meaningful engagement, particularly with vulnerable communities, and 
further clarify what is meant by meaningful engagement with pertinent 
stakeholders. Some commenters cited lack of clarity in expressing their 
concern with meaningful engagement being a requirement for state plan 
approvability.
    Based on comments received, the EPA has revised the proposed 
definition of meaningful engagement and is finalizing revisions that 
are flexible enough to serve the unique needs of states and their 
stakeholders, rather than relying on the more prescriptive approach of 
the proposal. The EPA recognizes that states will generally be in the 
best position to understand how to meaningfully engage pertinent 
stakeholders within their borders as they develop state plans. The EPA 
also believes that states and the Federal Government may learn from 
each

[[Page 80500]]

other's efforts to meaningfully engage pertinent stakeholders. The EPA 
further recognizes that appropriate approaches to meaningful 
engagement, as well as the time and resources needed, will be highly 
dependent on characteristics of the source category--such as the number 
and location of designated facilities--as well as on the type of health 
or environmental impacts of the emissions addressed by an EG. 
Additionally, as noted by a number of commenters, states are highly 
diverse in, among other things, their local conditions, resources, and 
established practices of engagement. Also as noted by commenters, 
vulnerable communities are highly diverse in, among other things, their 
technical capacities, access to resources for meaningful participation 
(e.g., geographic distribution, transportation, childcare), languages, 
and available representation.
    For these reasons, rather than finalizing prescriptive substantive 
requirements for how states should conduct meaningful engagement, the 
EPA is requiring in subpart Ba that states, in their state plan 
submissions or significant plan revisions, describe the efforts they 
undertook to meaningfully engage pertinent stakeholders, what input 
they received from stakeholders, and how that input was used or not 
used in their state plan. The EPA will also include this information 
when promulgating Federal plans or significant plan revisions. In 
addition, the EPA is describing some current best practices for 
meaningful engagement in this preamble that states may consider, that 
and which the Agency expects will continue to develop as states 
experiment with different types of meaningful engagement and share 
their experiences through state plans.
    Consistent with these changes, the EPA is finalizing the definition 
of meaningful engagement, as it applies to subpart Ba, as follows: ``. 
. . timely engagement with pertinent stakeholders and/or their 
representatives in the plan development or plan revision process. Such 
engagement should not be disproportionate in favor of certain 
stakeholders and should be informed by available best practices.'' 
States should therefore make a good faith effort to ensure that they 
are engaging in a proportionate manner with all pertinent stakeholders. 
The EPA is also finalizing, as proposed, a definition of ``pertinent 
stakeholders.'' Pertinent stakeholders ``include, but are not limited 
to, industry, small business, and communities most affected by and/or 
vulnerable to the impacts of the plan or plan revision.'' Finally, the 
EPA is including in subpart Ba the three proposed completeness criteria 
requirements for meaningful engagement at 40 CFR 60.27a(g)(2)(ix) and 
adding a fourth completeness criterion, which will require state to 
include in their plans a description of how stakeholder input was 
considered in the development of the state plan or plan revisions.
    The EPA expects that the finalized approach to meaningful 
engagement in state plans will provide the flexibility needed to allow 
states to address specific and unique issues in their states and to 
appropriately communicate with and respond to their stakeholders during 
the notice and comment process. As revised, the meaningful engagement 
component finalized here strengthens the framework for public 
participation in state plan development, a long-standing cornerstone of 
the cooperative federalism structures of CAA sections 110 and 111(d). 
The meaningful engagement component finalized here is intended to 
promote equitable opportunities to participate in the planning process 
for all stakeholders, as opposed to dictating a specific approach or 
set of practices that constitute meaningful engagement.
    To support the goals outlined above, and in response to comments 
received, the EPA is finalizing the proposed completeness criteria that 
require documentation of meaningful engagement, including adding a 
fourth completeness criterion, but the EPA is not finalizing specific 
requirements for what types of outreach meaningful engagement must 
include in subpart Ba. The fourth completeness criterion will require 
states to include a description of how stakeholder input from the 
meaningful engagement process was considered in the development of the 
plan, which the EPA expects will both bolster accountability to 
stakeholders and assist states in ensuring that their meaningful 
engagement processes are additive to the public hearing and 
notification processes which has always been required under subpart Ba. 
See 40 CFR 60.27a(g)(1)(ix). While the EPA finds that the requirements 
finalized in this action are sufficient and appropriate for the general 
CAA section 111(d) implementing regulations, the EPA may provide 
additional guidance pertaining to meaningful engagement in specific 
EGs.
    While the EPA is revising the definition of meaningful engagement 
relative to proposal, the definition of pertinent stakeholders is being 
finalized as proposed. Pertinent stakeholders include, among other 
stakeholders, industry, small business, and communities--in particular, 
communities who are most affected by and vulnerable to the health or 
environmental impacts of pollution from the designated facilities 
addressed by the plan or plan revision. Increased vulnerability of 
communities may be attributable to, among other reasons, an 
accumulation of negative environmental, health, economic, or social 
conditions within these populations or communities, and a lack of 
positive conditions. Examples of such communities have historically 
included, but are not limited to, communities of color (often referred 
to as ``minority'' communities), low-income communities, Tribal and 
indigenous populations, and communities in the United States that 
potentially experience disproportionate health or environmental harms 
and risks as a result of greater vulnerability and/or exposure to 
environmental hazards. For example, populations lacking the resources 
and representation to combat the effects of climate change--which could 
include populations exposed to greater drought or flooding, or damaged 
crops, food, and water supplies--experience greater vulnerability to 
environmental hazards. Sensitive populations (e.g., infants and 
children, pregnant women, the elderly, and individuals with 
disabilities exacerbated by environmental hazards) may also be most 
affected by and vulnerable to the impacts of the plan or plan revision 
depending on the pollutants or other factors addressed by an EG.
    Communities in neighboring states or neighboring Tribal nations may 
also be impacted by a state plan and, if so, are pertinent 
stakeholders. In addition, to the extent a designated facility would 
qualify for a less stringent standard through consideration of RULOF as 
described in section III.E. of this preamble, the pertinent 
stakeholders would include the communities most affected by and 
vulnerable to the health and environmental impacts from the designated 
facility considered in a state plan for RULOF provisions.
    The EPA has determined that the definitions of meaningful 
engagement and pertinent stakeholders in subpart Ba provide the states 
sufficient specificity while allowing for flexibility in the 
implementation of meaningful engagement. Meaningful engagement is an 
enhancement of the existing public notice and comment requirements and 
is intended to promote the sharing of relevant information with, and 
the soliciting of input from, pertinent stakeholders at critical 
junctures during plan development. In particular, the

[[Page 80501]]

processes for meaningful engagement should allow for fair and balanced 
participation, including opportunities for communities most affected by 
and vulnerable to the impacts of a plan an opportunity to be informed 
of and weigh in on that plan. These procedural requirements, in turn, 
help ensure that a plan will adequately address the potential impacts 
to public health and welfare that are the core concern of CAA section 
111. Meaningful engagement can provide valuable information regarding 
health and welfare impacts experienced by the public (e.g., recurring 
respiratory illness, missed work or school days due to illness 
associated with pollution, and other impacts) and allow regulatory 
authorities to explore additional options to improve public health and 
welfare. Because the CAA section 111(d) program is designed to address 
widely varying types of air pollutants that may have very different 
types of impacts, from highly localized to regional or global, what 
constitutes fair and balanced participation among a broad set of 
pertinent stakeholders will be highly dependent on which stakeholders 
are directly impacted by a particular state plan.
    The EPA's authority for finalizing procedural requirements to 
strengthen the public participation provisions of the implementing 
regulations is provided by the authority of both CAA sections 111(d) 
and 301(a)(1). Under CAA section 111(d), one of the EPA's obligations 
is to ``establish a procedure similar to that provided by'' CAA section 
110, under which states submit plans that implement emission reductions 
consistent with the BSER. CAA section 110(a)(1) requires states to 
adopt and submit SIPs after ``reasonable notice and public hearings.'' 
\41\ The Act does not define what constitutes ``reasonable notice and 
public hearings'' under CAA section 110, and the EPA has reasonably 
interpreted this requirement in promulgating a process under which 
states submit state plans.\42\
---------------------------------------------------------------------------

    \41\ 42 U.S.C. 7410(a)(1).
    \42\ See 40 CFR 51.102; 40 CFR part 51, appendix V, section 2.1.
---------------------------------------------------------------------------

    Subpart Ba currently includes certain requirements for notice and 
public hearing in 40 CFR 60.23a(c) through (f). The notice requirements 
include prominent advertisement to the public of the date, time, and 
place of the public hearing, 30 days prior to the date of such hearing, 
and the advertisement requirement may be satisfied through publication 
to the internet. Id. at paragraph (d). A state may choose to cancel a 
public hearing if no request for one is received during the required 
notification period. Id. at paragraph (e).
    A fundamental purpose of the Act's notice and public hearing 
requirements is to ensure that all affected members of the public are 
able to participate in pollution control planning processes that impact 
their health and welfare.\43\ In order to effectuate this purpose of 
the Act's notice and public hearing requirements, the notice of the 
proposed plans and of the public hearings should be reasonably adequate 
in its ability to reach affected members of the public. While many 
states provide for notification of public engagement through the 
internet consistent with the current requirements under the CAA section 
111(d) implementing regulations, such notification may not be adequate 
to reach all those who are impacted by a CAA section 111(d) state plan 
and would benefit the most from participating in the state planning 
process. For example, data shows that as many as 30 million Americans 
do not have access to broadband infrastructure that delivers even 
minimally sufficient speeds, and that 25 percent of adults ages 65 and 
older report never going online.\44\ Accordingly, the EPA has 
determined that it is appropriate to improve the procedural public 
engagement requirements under CAA section 111(d) to ensure the 
statutory objectives are met.
---------------------------------------------------------------------------

    \43\ Consistent with this principle of providing reasonable 
notice under the CAA, under programs other than CAA section 111(d), 
current regulations governing other CAA programs similarly require 
states to provide specific notice to an area affected by a 
particular proposed action. See e.g., 40 CFR 51.161(b)(1) (requiring 
specific notice for an area affected by a state or local agency's 
analysis of the effect on air quality in the context of the New 
Source Review program (40 CFR 51.102(d)(2), (4), and (5) (requiring 
specific notice for an area affected by a CAA section 110 SIP 
submission).
    \44\ FACT SHEET: Biden-Harris Administration Mobilizes Resources 
to Connect Tribal Nations to Reliable, High-Speed Internet (December 
22, 2021). <a href="https://www.whitehouse.gov/briefing-room/statements-releases/2021/12/22/fact-sheet-biden-harris-administration-mobilizes-resources-to-connect-tribal-nations-to-reliable-high-speed-internet/">https://www.whitehouse.gov/briefing-room/statements-releases/2021/12/22/fact-sheet-biden-harris-administration-mobilizes-resources-to-connect-tribal-nations-to-reliable-high-speed-internet/</a>; 7 percent of Americans don't use the internet. Who 
are they? Pew Research Center (April 2, 2021), <a href="https://www.pewresearch.org/fact-tank/2021/04/02/7-of-americans-dont-use-the-internet-who-are-they/">https://www.pewresearch.org/fact-tank/2021/04/02/7-of-americans-dont-use-the-internet-who-are-they/</a>.
---------------------------------------------------------------------------

    Given the public health and welfare objectives of CAA section 
111(d) in regulating specific existing sources, it is reasonable to 
include a meaningful engagement component as part of the state plan 
development public participation process in order to further these 
objectives. Additionally, CAA section 301(a)(1) provides that the EPA 
is authorized to prescribe such regulations ``as are necessary to carry 
out [its] functions under [the CAA].'' As finalized, the meaningful 
engagement components of this rule would effectuate the EPA's function 
under CAA section 111(d) in prescribing a process under which states 
submit plans to implement the statutory directives of this section and 
promote the statutory objective that all pertinent stakeholders have 
reasonable notice of relevant information and the opportunity to 
participate in the state plan development throughout the process. 
Ongoing engagement between states and pertinent stakeholders will help 
ensure that plans achieve the appropriate level of emission reductions, 
that communities most affected by and vulnerable to the health and 
environmental impacts from the designated facilities share in the 
benefits of the state plan, and that these communities are protected 
from being adversely impacted by the plan.
    To promote meaningful engagement, the EPA is finalizing as part of 
the completeness criteria in 40 CFR 60.27a(g) procedural requirements 
for states to describe in their plan submittals how they engaged with 
pertinent stakeholders. As proposed, the state will be required to 
describe, in its plan submittal, (1) a list of the pertinent 
stakeholders identified by the state; (2) a summary of engagement 
conducted; and (3) a summary of the stakeholder input received. The EPA 
is also finalizing a fourth component as part of the procedural 
completeness demonstration--that the state also includes (4) a 
description of how stakeholder input was considered in the development 
of the plan or plan revisions. The EPA will review the state plan to 
ensure it includes these required descriptions regarding meaningful 
public engagement as part of its completeness evaluation of a state 
plan submittal. If a state plan submission does not include the 
required elements for notice and opportunity for public participation, 
including the procedural requirements at 40 CFR 60.23a(i) and 
60.27a(g)(2)(ix) for meaningful engagement, this may be grounds for the 
EPA to find the submission incomplete or (where a plan has become 
complete by operation of law) to disapprove the plan.
    While the EPA is finalizing procedural requirements for meaningful 
engagement as completeness criteria and is not prescribing how states 
proceed with such engagement, we understand states would find it useful 
to consider guidance as to how such engagement could be meaningfully 
conducted. In light of this interest, the following paragraphs provide 
examples and guidance which the EPA

[[Page 80502]]

encourages states to consider in designing their own meaningful 
engagement programs.
    In considering approaches for meaningful engagement, states should 
consider the identification of pertinent stakeholders; developing a 
strategy for engagement with the identified pertinent stakeholders; 
making information available in a transparent manner; and providing 
adequate and accessible notice. First, it would be reasonable for 
states to identify pertinent stakeholders considering information 
specific to the applicable EG, including the nature of the designated 
pollutants at issue and the communities likely to be impacted by 
facilities in the source category. The EPA intends to specifically 
provide information on impacts of designated pollutant emissions to 
assist states in the identification of their pertinent stakeholders, in 
addition to any other guidance that EPA may find it reasonable to 
provide in the applicable EG. Moreover, in developing a strategy for 
engagement, it would be reasonable for states to share information and 
solicit input on plan development and on any accompanying assessments. 
Finally, in providing transparent and adequate notice of plan 
development, states should consider that internet notice alone may not 
be adequate for all stakeholders, given lack of access to broadband 
infrastructure in many communities. Thus, in addition to internet 
notice, examples of prominent advertisement for engagement and public 
hearing may include notice through newspapers, libraries, schools, 
hospitals, travel centers, community centers, places of worship, gas 
stations, convenience stores, casinos, smoke shops, Tribal Assistance 
for Needy Families offices, Indian Health Services, clinics, and/or 
other community health and social services as appropriate for the 
emission guideline addressed.
    The EPA believes the following example, while not tailored to 
specific designated facilities but to a source category for recent EG 
development, provides states with ideas for how they can structure 
their own meaningful engagement activities.\45\ Prior to the November 
2021 proposal for the ``Standards of Performance for New, 
Reconstructed, and Modified Sources and Emissions Guidelines for 
Existing Sources: Oil and Natural Gas Sector Climate Review'' (86 FR 
63110), the EPA conducted meaningful engagement with pertinent 
stakeholders. For the pre-proposal stakeholder outreach, the EPA 
engaged with stakeholders through information posted on the internet, 
meetings, training webinars, and public listening sessions to 
disseminate information regarding this action, communicate how to 
submit comments on the proposed rule, and receive stakeholder input 
about the industry and its impact. In addition to the pre-proposal 
stakeholder engagement, the EPA conducted additional post-proposal 
training during the comment period on the proposed rule and held a 
public hearing. The EPA conducted three half-day post-proposal 
trainings to provide background information, an overview of the 
proposed rule, stakeholder panel discussions, and information on how to 
effectively engage in the regulatory process. The trainings were open 
to the public, focusing on individuals from and representatives of 
communities with EJ concerns, Tribes, and small businesses. Further 
considerations, analyses, and outreach relevant to meaningful 
engagement are presented in sections VI.\46\ and VII.\47\ of the 
preamble for that action and could help states in designing, planning, 
and developing their own outreach and engagement plans associated with 
the development and implementation of their state plans. An additional 
resource is the memorandum on stakeholder outreach \48\ for the ``New 
Source Performance Standards for Greenhouse Gas Emissions from New, 
Modified, and Reconstructed Fossil Fuel-Fired Electric Generating 
Units; Emission Guidelines for Greenhouse Gas Emissions from Existing 
Fossil Fuel-Fired Electric Generating Units; and Repeal of the 
Affordable Clean Energy Rule'' proposed rule (88 FR 33240, May 23, 
2023). This memorandum provides states with another example of the 
types of activities and processes that the EPA has found appropriate 
for meaningfully engaging with stakeholders in the particular context 
of EG development.
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    \45\ The EPA emphasizes that the appropriateness of any 
meaningful engagement strategy will depend on the specific context, 
including the sources and pollutants addressed by the EG, the scope 
and scale of the proposed regulation or plan, and the pertinent 
stakeholders. The activities and processes included in the examples 
of meaningful engagement in this preamble were tailored to the 
specific circumstances of EPA's EG development.
    \46\ See 86 FR 63110, 63140.
    \47\ See 86 FR 63110, 63145.
    \48\ See Docket ID No. EPA-HQ-OAR-2023-0072-0002.
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    The EPA recognizes that the state planning process is different 
than a national rulemaking and may benefit from different types of 
engagement. Nonetheless, the information and examples the EPA has 
provided on meaningful engagement can serve as an example of what types 
of engagement states should consider for their meaningful engagement 
processes. In addition, to further assist states in the meaningful 
engagement efforts, the EPA expects to develop resources to aid states 
in establishing meaningful engagement best practices, while recognizing 
that states have differing situations and that best practices will not 
be ``one size fits all.'' One resource that states may find helpful in 
developing their own best practices is the ``Public Involvement Policy 
of the US Environmental Protection Agency,'' \49\ which is currently 
under revision. Another helpful resource the EPA has developed is the 
``Capacity Building Through Effective Meaningful Engagement'' 
booklet.\50\ The booklet is also available in the docket for this rule. 
Additionally, most states have opted into the EPA Climate Pollution 
Reduction Grant Program (CPRG),\51\ developed under the Inflation 
Reduction Act.\52\ To assist states that are participating in the CPRG, 
the EPA is conducting training for states on meaningful engagement, 
sharing case studies, best practices, and lessons learned through 
ongoing EPA-led CPRG forums. The EPA expects that, with experience and 
shared access to information on best practices, approaches to address 
challenges and barriers, and other resources and collaborative 
opportunities, meaningful engagement practices at the state and Federal 
level will continue to improve.
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    \49\ <a href="https://archive.epa.gov/publicinvolvement/web/pdf/policy2003.pdf">https://archive.epa.gov/publicinvolvement/web/pdf/policy2003.pdf</a>.
    \50\ <a href="https://www.epa.gov/system/files/documents/2023-09/epa-capacity-building-through-effective-meaningful-engagement-booklet_0.pdf">https://www.epa.gov/system/files/documents/2023-09/epa-capacity-building-through-effective-meaningful-engagement-booklet_0.pdf</a>.
    \51\ See U.S. EPA Office of Air and Radiation ``Climate 
Pollution Reduction Grants Program: Formula Grants for Planning 
Program Guidance for States, Municipalities, and Air Pollution 
Control Agencies'' (March 1, 2023), <a href="https://www.epa.gov/system/files/documents/2023-02/EPA%20CPRG%20Planning%20Grants%20Program%20Guidance%20for%20States-Municipalities-Air%20Agencies%2003-01-2023.pdf">https://www.epa.gov/system/files/documents/2023-02/EPA%20CPRG%20Planning%20Grants%20Program%20Guidance%20for%20States-Municipalities-Air%20Agencies%2003-01-2023.pdf</a> (overview of the 
CPRG). See also U.S. EPA, ``Status of Notice of Intent to 
Participate (NOIP) Submittals by States (March 31, 2023), <a href="https://www.epa.gov/system/files/documents/2023-04/NOIP%20Status%20Lists.pdf">https://www.epa.gov/system/files/documents/2023-04/NOIP%20Status%20Lists.pdf</a> 
(list of states who have opted in to the CPRG as of March 31, 2023).
    \52\ Inflation Reduction Act section 60114.
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D. Regulatory Mechanisms for State Plan Implementation

    CAA section 111(d)(1) requires the EPA to promulgate regulations 
that establish a procedure ``similar'' to that provided by CAA section 
110 for each state to ``submit to [the EPA] a state plan which . . . 
establishes standards of performance . . . and . . . provides for the 
implementation and enforcement of such standards.'' The EPA reasonably 
interprets this provision, particularly

[[Page 80503]]

the ``similar'' clause, as referring to all the procedural provisions 
provided in CAA section 110 which serve the same purposes of providing 
useful flexibilities for states and EPA actions that help ensure 
emission reductions are appropriately and timely implemented.
    The EPA proposed to incorporate 5 regulatory mechanisms as 
amendments to the implementing regulations under 40 CFR part 60, 
subpart Ba, governing the processes under which states submit plans and 
the EPA acts on those plans. 87 FR 79176, 79193-96 (Dec. 23, 2022). The 
proposed additional regulatory mechanisms include: (1) partial approval 
and disapproval of state plans by the EPA; (2) conditional approval of 
state plans by the EPA; (3) parallel processing of plans by the EPA and 
states; (4) a mechanism that allows the EPA to call for revision of a 
previously approved state plan; and (5) an error correction mechanism 
for the EPA to revise its prior action on a state plan.\53\ These 
mechanisms were proposed to update the implementing regulations to 
better align with the flexible procedural tools that Congress added 
into section 110 of the CAA in the 1990 Amendments. The EPA is 
finalizing the adoption and incorporation of these mechanisms into 
subpart Ba as the EPA has interpreted and applied them in the context 
of CAA section 110.
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    \53\ These regulatory mechanisms were also previously proposed 
to be added to subpart B in 2015 and largely received support from 
states, the public, and stakeholders, but were never finalized. 80 
FR 64965 (October 23, 2015).
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    As explained in the notice of proposed rulemaking, the 
interpretation that CAA section 111(d)(1) authorizes the EPA to adopt 
procedures ``similar'' to those under CAA section 110 for the entire 
state plan process, and not just the initial plan submission process, 
is strengthened by the provisions in CAA section 111(d)(2), which 
provide that the EPA has the ``same'' authority to promulgate a Federal 
plan for a state that has failed to submit a satisfactory plan as under 
CAA section 110(c), and to enforce state plan requirements as it does 
for SIPs under CAA sections 113 and 114. This is because, read 
together, CAA section 111(d)(1) and (2) call for the set of essential 
procedural requirements for state and Federal plan development and 
implementation and enforcement that generally reflect the essential 
procedural requirements for SIPs and FIPs in section 110.\54\ In that 
context, it is reasonable to read CAA section 111(d)(1) as authorizing 
the EPA to promulgate procedures for section 111(d) that are comparable 
to CAA section 110 procedures for the overall state plan process. 
Moreover, the EPA believes that it is reasonable, in promulgating the 
regulations required under CAA section 111(d)(1), to look to the 
mechanisms and flexibilities that Congress has deemed appropriate for 
states and the EPA to use in the highly analogous context of state and 
Federal implementation plans.
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    \54\ Compare CAA section 111(d)(1) (requiring states to submit 
state plans that include specified types of measures that, in turn, 
meet minimum EPA requirements) and section 111(d)(2) (indicating 
that the EPA must review and approve or disapprove state plans, 
requiring the EPA to promulgate a Federal plan if the state does not 
submit a satisfactory plan, authorizing the EPA to enforce state 
plan measures) with section 110(a)(1)-(2) (requiring states to 
submit SIPs that include specified types of measures that in turn 
meet minimum EPA requirements), section 110(k) (requiring the EPA to 
review and approve or disapprove SIPs), section 110(c) (requiring 
the EPA to promulgate a FIP if the state does not submit a plan or 
the EPA disapproves the state plan) and 113(a)(1) (authorizing the 
EPA to enforce SIP measures).
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    The availability of these 5 regulatory mechanisms will streamline 
the state plan review and approval process, accommodate variable state 
processes, facilitate cooperative federalism, further protect public 
health and welfare, and generally enhance the implementation of the CAA 
section 111(d) program. Together, these mechanisms provide greater 
flexibility, may reduce processing time, and have proven to be very 
useful tools for the review and processing of CAA section 110 SIPs.
    Overall, the comments received for incorporating the 5 regulatory 
mechanisms were favorable, in particular noting that the mechanisms 
would offer not only procedural improvements long sought by state 
agencies but also reflect the flexibility offered in section 111 of the 
CAA, consistent with the Act's cooperative approach, and would expand 
state planning options while conserving state resources. However, one 
commenter noted generally that for 111(d) plans, the CAA directs the 
EPA to establish a procedure similar to CAA section 110 for SIP 
submittals but does not require those procedures to be identical. This 
commenter contended that while the CAA specifically authorized various 
flexible mechanisms in sections 110(k)(2)-(6), the plain language of 
CAA section 111 does not provide for these options for 111(d) plans.
    The EPA agrees that procedures adopted under CAA section 111(d)(1) 
need not be identical to CAA section 110 procedures, but interprets 
section 111(d)(1) to authorize the EPA to adopt procedures under 
111(d)(1) which are substantially the same as those outlined under 
section 110, including section 110 procedural mechanisms.\55\ 
Additionally, as explained above, while CAA section 111(d)(1) directs 
EPA to establish ``a procedure . . . under which each State shall 
submit to the Administrator a plan,'' section 111(d)(2) further 
provides that EPA also has authority to prescribe a Federal plan where 
states fail to submit a satisfactory plan and to enforce the provisions 
of state plans in cases where states fail to do so. Congress saw fit to 
provide mechanisms such as conditional approval and SIP calls under CAA 
section 110 for the purpose of EPA evaluation and action on, and 
enforcement of, SIPs, and the Agency believes it is reasonable to look 
to section 110 as evidence of the types of mechanisms that are 
reasonable for EPA to provide for the same purposes under section 
111(d).
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    \55\ See Merriam Webster's Dictionary, defining ``Similar'' as 
``having characteristics in common'' or ``alike in substance and 
essentials.'' <a href="https://www.merriam-webster.com/dictionary/similar">https://www.merriam-webster.com/dictionary/similar</a>.
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    These regulatory mechanisms will provide flexibility and support 
efficiency to the states and the EPA in the submission and processing 
of state plans. For the reasons discussed in the following sections, 
the EPA is finalizing these provisions.
1. Partial Approval and Disapproval
    The EPA proposed a provision similar to that under CAA section 
110(k)(3) for the EPA to partially approve and partially disapprove 
severable portions of a state plan submitted under CAA section 111(d). 
Under CAA section 110(k)(3), ``[i]f a portion of the plan revision 
meets all the applicable requirements of this chapter, the 
Administrator may approve the plan revision in part and disapprove the 
plan revision in part. The plan revision shall not be treated as 
meeting the requirements of this chapter until the Administrator 
approves the entire plan revision as complying with the applicable 
requirements of this chapter.'' Subpart Ba currently authorizes the EPA 
to ``approve or disapprove [the state] plan or revision or each portion 
thereof'' (40 CFR 60.27a(b)) but does not explicitly specify whether 
such actions may be partial.
    One commenter stated that the partial approval and disapproval 
mechanisms the EPA proposed appear to be aimed at providing a way for 
the EPA to approve model rule provisions and disapprove RULOF 
provisions. The EPA disagrees with this comment. The EPA reviews each 
provision of a state plan, regardless of the type of provision, to 
determine whether it meets the applicable

[[Page 80504]]

statutory and regulatory requirements. If it meets the applicable 
requirements, the EPA must approve it. It is entirely possible, and in 
fact common, for some state plan provisions to comport with the 
applicable requirements and others not to. Pursuant to this mechanism, 
the EPA may partially approve or partially disapprove a state plan when 
portions of the plan are approvable, but other discrete and severable 
portions are not. In such cases, the purposes of a CAA section 111(d) 
EG, as well as section 111(d)'s framework of cooperative federalism, 
would be better served by allowing the state to move forward with 
implementing those portions of the plan that are approvable, rather 
than to disapproving the full plan and potentially delaying 
implementation of beneficial emission reductions. This mechanism is 
consistent with the ALA decision's emphasis on ensuring timely 
mitigation of harms to public health and welfare, as problematic parts 
of a state plan submission would not stall the implementation of 
emission reductions at designated facilities for which a portion of a 
plan could be approved, thus efficiently reducing the time from EG 
promulgation to implementation of emission reductions at those 
facilities.
    The EPA is finalizing this provision so that it is similar to CAA 
section 110(k)(3), providing clarity on the EPA's authority to 
partially approve plans and the circumstances under which it may be 
used. As explained at proposal, the portion of a state plan that the 
EPA may partially approve must be ``severable.'' A portion is severable 
when: (1) the approvable portion of the plan does not depend on or 
affect the portion of the plan that cannot be approved, and (2) 
approving a portion of the plan without approving the remainder does 
not alter the approved portion of a state plan in any way that renders 
it more stringent than the state's intent. See Bethlehem Steel v. 
Gorsuch, 742 F.2d 1028, 1034 (7th Cir. 1984). The EPA's decision to 
partially approve and partially disapprove a plan must go through 
notice and comment rulemaking. As a result, the public will have an 
opportunity to submit comment on the appropriateness and legal 
application of this mechanism on a particular state plan submission. A 
partial disapproval of a plan submission would have the same legal 
effect as a full disapproval for purposes of the EPA's authority under 
CAA section 111(d)(2)(A) to promulgate, for the partially disapproved 
portion of the plan, a Federal plan for the state to fill the gap. See 
section III.A.4 of this preamble for finalized timelines for 
promulgation of a Federal plan. If the EPA does promulgate a Federal 
plan for a partially disapproved portion, the state may, at any time, 
submit a revised plan to replace that portion. If the state does so, 
and the EPA approves the revised plan, then the EPA would withdraw the 
Federal plan for that state.
    This partial approval/disapproval mechanism also enables states to 
submit, and authorizes the EPA to approve or disapprove, state plans 
that are partial in nature and to address only certain elements of a 
broader program. For example, with this mechanism, states will be able 
to submit partial plans intended to replace discrete portions of a 
Federal plan, where appropriate. Partial submittals must meet all 
completeness criteria.
2. Conditional Approval
    The EPA proposed a mechanism analogous to the authority under CAA 
section 110(k)(4) to grant the EPA the ability to conditionally approve 
a state plan under CAA section 111(d). Under CAA section 110(k)(4), 
``[t]he Administrator may approve a plan revision based on a commitment 
of the state to adopt specific enforceable measures by a date certain, 
but not later than 1 year after the date of approval of the plan 
revision. Any such conditional approval shall be treated as a 
disapproval if the state fails to comply with such commitment.'' The 
proposed provision would authorize the EPA to conditionally approve a 
plan submission that substantially meets the requirements of an EG but 
that requires some additional, specified revisions to be fully 
approvable. For the EPA to conditionally approve a submission, the 
state Governor or their designee must commit to adopt and submit 
specific enforceable provisions to remed

[…truncated; see source link]
Indexed from Federal Register on November 17, 2023.

This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.