Chesapeake Climate Action Network v. EPA ( 2020 )


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  •  United States Court of Appeals
    FOR THE DISTRICT OF COLUMBIA CIRCUIT
    Argued October 21, 2019                Decided March 13, 2020
    No. 15-1015
    CHESAPEAKE CLIMATE ACTION NETWORK, ET AL.,
    PETITIONERS
    v.
    ENVIRONMENTAL PROTECTION AGENCY,
    RESPONDENT
    ALABAMA POWER COMPANY, ET AL.,
    INTERVENORS
    Consolidated with 16-1169, 16-1349
    On Petitions for Review of Agency Action of the
    United States Environmental Protection Agency
    Patton Dycus argued the cause for petitioners. With him
    on the briefs were Neil Gormley, James S. Pew, and Eric
    Schaeffer. Sanjay Narayan entered an appearance.
    Meghan E. Greenfield, Trial Attorney, U.S. Department of
    Justice, argued the cause for respondent. With her on the brief
    were Jeffrey Bossert Clark, Assistant Attorney General, and
    Jonathan D. Brightbill, Principal Deputy Assistant Attorney
    2
    General. Norman L. Rave Jr. and Stephanie J. Talbert,
    Attorneys, entered appearances.
    Lauren E. Freeman, Makram B. Jaber, Andrew D.
    Knudsen, C. Grady Moore, III, Margaret C. Campbell, and
    Emily Gerhardt were on the brief for industry intervenor-
    respondents.
    Before: TATEL, PILLARD, and WILKINS, Circuit Judges.
    Opinion for the Court filed by Circuit Judge WILKINS.
    WILKINS, Circuit Judge: Congress charged the EPA with
    establishing emission regulations under the Clean Air Act. In
    a 2014 final rule challenged here, EPA exempted coal- and oil-
    burning power plant utility boilers’ startup periods from
    numerical limits on hazardous air pollutants. Instead, EPA
    imposed qualitative “work practice” standards during these
    periods of time. This consolidated action challenges that final
    rule on two fronts. First, Petitioners challenge EPA’s denial of
    their petition for reconsideration of the final rule as
    procedurally improper. Second, Petitioners challenge the final
    rule itself as arbitrary and capricious.
    For the reasons that follow, we conclude that EPA erred in
    denying Petitioners’ petition for reconsideration. We grant the
    petition in No. 16-1349 because it was impracticable for
    Petitioners to raise their two objections during the notice-and-
    comment period and the objections were of central relevance
    to the final rule. Because we remand the final rule for EPA’s
    reconsideration, we do not reach the merits arguments set forth
    in No. 15-1015.1
    1
    Petitioners brought a third challenge to a separate final action by EPA on
    April 6, 2016, entitled “National Emission Standards for Hazardous Air
    Pollutants From Coal- and Oil-Fired Electric Utility Steam Generating
    3
    I.
    The Clean Air Act (“CAA”), 42 U.S.C. § 7401 et seq., was
    enacted “to protect and enhance the quality of the Nation’s air
    resources so as to promote the public health and welfare and
    the productive capacity of its population,” § 7401(b)(1). In
    order to regulate the emission of toxic pollutants considered
    hazardous to public health, the CAA created a list of hazardous
    air pollutants (HAPs) and required EPA to promulgate
    restrictions on their emission by various sources. See U.S.
    Sugar Corp. v. EPA, 
    830 F.3d 579
    , 593 (D.C. Cir. 2016) (per
    curiam). This case involves such restrictions on an important
    category of existing major sources, specifically utility boilers
    at coal-fired and oil-fired power plants. See § 7412(a)(10)
    (defining “existing source” as “any stationary source other than
    a new source”); U.S. Sugar 
    Corp., 830 F.3d at 593
    (describing
    major sources as “‘any stationary source or group of stationary
    sources’ that neighbor each other, share common control, and
    emit (or have the potential to emit) either ten tons per year or
    more of any single HAP or twenty-five tons per year or more
    of any HAP combination” (quoting § 7412(a)(1))).
    EPA must set HAP emission limits in the form of
    numerical limits whenever “feasible,” § 7412(d)(2), (h)(4), and
    limits for major sources must be capped at the “the maximum
    degree of reduction in emissions” that EPA deems
    Units and Standards of Performance for Fossil-Fuel-Fired Electric Utility,
    Industrial-Commercial-Institutional, and Small Industrial-Commercial-
    Institutional Steam Generating Units; Technical Correction.” 81 Fed. Reg.
    20,172 (April 6, 2016). We consolidated that challenge, contained in
    Petitioners’ Petition for Review at No. 16-1169, with the two petitions
    discussed herein. Petitioners acknowledged both in their opening brief and
    at oral argument that they do not “specifically challeng[e] any portion of the
    final action at issue” with respect to that April 6, 2016, final action, so we
    dismiss the petition in No. 16-1169. Pet’rs’ Opening Br. 3 n.1.
    4
    “achievable,” § 7412(d)(2). EPA’s determination of what is
    “achievable” is often referred to as a “MACT” standard, as in
    “maximum achievable control technology.” U.S. Sugar 
    Corp., 830 F.3d at 594
    .
    In setting a MACT standard, EPA follows a two-step
    process. 
    Id. at 594.
    First, it creates a “MACT floor” for each
    category of emissions source that “ensures that all HAP sources
    at least clean up their emissions to the level that their best
    performing peers have shown can be achieved.” 
    Id. (internal quotation
    marks omitted). For sources like those at issue here,
    “the MACT floor cannot be less stringent than the average
    emissions limits achieved by the best performing 12 percent of
    existing sources in that category or subcategory.” 
    Id. (citing §
    7412(d)(3)(A) (emphasis added)). Second, EPA may
    exercise its discretion “to require an even greater reduction in
    emissions, taking into account costs, health effects,
    environmental effects, and energy requirements.” Nat. Res.
    Def. Council v. EPA, 
    529 F.3d 1077
    , 1079 (D.C. Cir. 2008)
    (citing § 7412(d)(2)).2
    Congress recognized that numerical HAP emission limits
    for MACT standards may not always be “feasible,” so it
    included § 7412(h), which enables EPA to promulgate number-
    alternative standards called “work practice” standards.
    § 7412(h); see Sierra Club v. EPA, 
    884 F.3d 1185
    , 1190 (D.C.
    Cir. 2018) (“Work practice standards can be thought of as a
    statutory Plan B; EPA may resort to them only when using
    numeric limits is not feasible.” (internal quotation marks
    2
    This second step, often referred to as “beyond-the-floor” limits, “risk-
    based” limits, or “health-based” limits after the factors listed in
    § 7412(d)(2), is not at issue here. Cement Kiln Recycling Coal. v. EPA, 
    255 F.3d 855
    , 858 (D.C. Cir. 2001) (per curiam); see also Nat. Res. Def.
    
    Council, 529 F.3d at 1080
    .
    5
    omitted)). Relevant here, numerical MACT standards are not
    feasible (and thus “work practice” standards may be used)
    when “the application of measurement methodology to a
    particular class of sources is not practicable due to
    technological and economic limitations.” § 7412(h)(2)(B).
    However, work practice standards must be, “in the
    Administrator’s judgment,” consistent with numerical MACT
    requirements, § 7412(h)(1), i.e., “the maximum degree of
    reduction in emissions” that EPA deems “achievable,”
    § 7412(d)(2).
    In addition, although not expressly contemplated by the
    CAA, we have held that EPA has the “flexibility” to “regulate
    a HAP indirectly, by controlling a proxy, or ‘surrogate,’ instead
    of the pollutant itself. . . . so long as the resulting rules are
    reasonably calculated to control the relevant HAPs to the extent
    the statute demands.” Sierra 
    Club, 884 F.3d at 1190
    (citing
    U.S. Sugar 
    Corp., 830 F.3d at 628-29
    ).
    Finally, § 7607 sets forth the CAA’s administrative
    proceedings and judicial review provisions applicable to
    standards promulgated under § 7412. 42 U.S.C. § 7607(b),
    (d)(1)(C). Notices of proposed rulemaking are published in the
    Federal Register, accompanied by a statement of the basis and
    purpose, the period available for public comment, and a
    summary of the factual data on which the proposed rule is
    based and the methodology used in obtaining and analyzing the
    data. § 7607(d)(3). Anyone may submit written comments and
    data in response to a proposed rule during the comment period,
    § 7607(d)(3), (d)(5)(i), but one is entitled to reconsideration by
    the Administrator after the period for public comment has
    passed if that person can show: (1) “it was impracticable to
    raise such objection within such time or if the grounds for such
    objection arose after the period for public comment (but within
    the time specified for judicial review),” and (2) “such objection
    6
    is of central relevance to the outcome of the rule,”
    § 7607(d)(7)(B). EPA’s refusal to convene such a proceeding,
    which is what happened here, is subject to judicial review. See
    
    id. With this
    statutory framework in mind, we turn to the
    regulatory background that led to the final rule challenged here.
    II.
    Coal- and oil-fired electric utility steam generating units
    (sometimes referred to as “EGUs”) are one of the main sources
    of many HAPs emitted into our atmosphere. Air pollution from
    utility boilers at coal-fired and oil-fired power plants can be
    particularly problematic during a facility’s startup or shutdown
    period. According to EPA, an average power plant had
    between 9 and 10 startup events annually between 2011 and
    2012, but some plants had over 100 startup events in 2011.
    Assessment – Revised, EPA-HQ-OAR-2009-0234-20451, at 4
    (Nov. 2014). Environmental groups believe the number of
    startup events will increase as renewable energy and gas-fired
    units replace coal-fired power plants. Thus, EPA promulgated
    specific emission standards applicable during these periods.
    A.
    In February 2012, EPA promulgated the “MATS Rule,”
    which set national emission standards for HAPs emitted from
    utility boilers at coal-fired and oil-fired power plants. MATS
    Rule, 77 Fed. Reg. 9,304, 9,380-83 (Feb. 16, 2012). Not to be
    confused with MACT standards, MATS is shorthand for
    “Mercury and Air Toxics Standards.” 
    Id. at 9,306.
    The MATS
    Rule requires a power plant to comply with established
    numerical emission limits at all times except during periods of
    startup and shutdown. 
    Id. at 9,466.
    The numerical emission
    7
    limits in the MATS Rule are “production-based,” so EPA
    believed that startup periods – in which production is by
    definition non-existent – required separate emissions limits. 
    Id. at 9,381.
    The MATS Rule defined the period of “startup” as
    either the first-ever firing of fuel in a boiler for
    the purpose of producing electricity, or the
    firing of fuel in a boiler after a shutdown event
    for any purpose. Startup ends when any of the
    steam from the boiler is used to generate
    electricity for sale over the grid or for any other
    purpose (including on-site use).
    
    Id. at 9,486.
    EPA rationalized the definition “based on the fact
    that EGUs function to provide electricity primarily for sale to
    the grid but also at times for use on-site; therefore, EGUs
    should be considered to be operating normally at all times
    electricity is generated.” 
    Id. at 9,381.
    EPA acknowledged that
    it previously had proposed numerical emission standards for
    periods of startup, but it received a number of comments, with
    “[m]any commenters point[ing] to the lack of data in the record
    concerning emissions that occur during periods of startup.” 
    Id. The MATS
    Rule explained that of various data collected
    there were almost no HAP data for startup and
    shutdown periods and almost all of the data
    failed to meet our data quality requirements.
    Thus, we do not have sufficient data on
    emissions that occur during startup and
    shutdown on which to set emission standards.
    
    Id. Therefore, the
    MATS Rule promulgated non-numerical
    work practice standards for periods of startup and shutdown.
    
    Id. The work
    practice standards set forth in the MATS Rule
    required, among others, EGUs to use clean fuels for ignition.
    8
    
    Id. at tbl.
    3. The MATS Rule does not specifically cite to
    § 7412(h), which governs when work practice standards may
    be implemented in the place of numerical standards.
    B.
    Following the promulgation of the MATS Rule, “[t]he
    EPA received petitions [for reconsideration] asserting that the
    public lacked an opportunity to comment on the startup and
    shutdown provisions in the final MATS [Rule].”
    Reconsideration of Certain New Source and Startup/Shutdown
    Issues, 77 Fed. Reg. 71,323, 71,330 (Nov. 30, 2012). EPA
    acknowledged that it had previously “proposed numerical
    standards for startup and shutdown periods, and in response to
    comments on the proposed rule [it] changed those standards in
    the final MATS to work practice standards.” 
    Id. EPA re-
    opened the period for comment on the nature of the work
    practice standards during the startup period. Contrary to
    Intervenors’ assertion, EPA did not propose altering the
    endpoint of startup, which remained defined as the point in
    which the power plant is able to generate electricity.
    C.
    On June 25, 2013, EPA issued a Proposed Rule and
    Reopening of Comment Period. Reconsideration of Certain
    Startup/Shutdown Issues, 78 Fed. Reg. 38,001, 38,002
    (June 25, 2013) (“2013 Proposed Rule”). EPA explained that
    in the preceding comment period, “comments raised several
    significant issues regarding the definition of startup,” among
    other issues. 
    Id. Commenters proposed
    new startup endpoints
    based not on when the source first generated electricity, but on
    the number of hours after an EGU hits certain operational
    benchmarks because then air pollution control devices
    9
    (“APCDs”) would be operational. 
    Id. at 38,004.
    EPA noted
    that
    The commenters asserted that an EGU remains
    in “startup” mode beyond the first generation of
    electricity because, according to the
    commenters, at that point in time many of the
    APCDs needed to comply with the
    requirements of this subpart may not be
    technically or safely capable of operation and
    those that are may be operating far from design
    conditions because the requisite temperature(s)
    and/or flow conditions have not been achieved.
    
    Id. at 38,003.
    EPA sought comments on these suggested
    definitions “so that the public can review the industry-provided
    information and data and comment on the suggested revisions
    to the startup and shutdown provisions.” 
    Id. at 38,002.
    “In addition, the EPA request[ed] comment on the
    additional technical analyses it conducted in response to the
    above comments concerning the end of startup.” 
    Id. at 38,005
    (citing Assessment of Startup Period at Coal-fired Electric
    Generating Units, EPA-HQ-OAR-2009-0234-20224 (June 17,
    2013)). We refer to this technical support document, which
    accompanied the 2013 Proposed Rule, as the “2013 TSD.”
    According to the 2013 Proposed Rule, the 2013 TSD
    “examined several indicators that can aid in assessing the time
    required to achieve operating benchmarks.” 78 Fed. Reg. at
    38,005.
    The 2013 TSD identified those “several indicators” to be
    the removal efficacy of sulfur dioxide and nitrogen oxides
    emission APCDs, analyzing their average time for engagement
    across several categories. 2013 TSD, at 2. Although sulfur
    10
    dioxide and nitrogen oxides are not HAPs, “EPA believes that
    the removal efficacy of [these] APCDs, as evidenced by hourly
    emission rates well below uncontrolled levels, may be used as
    an indicator of the end of the startup period for the purpose of
    the MATS rule.” 
    Id. The 2013
    TSD identified a specific set of data3 on
    emissions in order to identify all startup events at different
    types of boilers. 
    Id. EPA analyzed
    when (in terms of hours)
    after generation sulfur dioxide and nitrogen oxides emissions
    were reduced by APCDs, and then categorized those results by
    combustion technologies, APCD type, and boiler type. 
    Id. EPA’s Assessment
    “found no significant difference in
    performance related to startup between the different groups
    assessed in this analysis,” and “could support defining the end
    of startup at coal-fired EGUs as occurring at [a specific
    capacity threshold] plus 3 hours or the start of electricity
    generation plus 6 hours, whichever comes first.” 78 Fed. Reg.
    at 38,005; see also 2013 TSD, at 19.
    Neither the 2013 TSD nor the 2013 Proposed Rule
    referenced the work practice standards provision, § 7412(h), or
    analyzed its requirements for application.
    3
    The data used in the 2013 TSD came from EPA’s Clean Air Markets
    Database, which included data from EPA’s Acid Rain Program. Petitioners
    base their arbitrary-and-capricious argument on EPA’s alleged failure to
    explain how it may treat emissions post-generation as immeasurable based
    on EPA’s measured emission data from another program. In other words,
    Petitioners argue that EPA failed to reasonably explain how it could treat
    similar situations differently. But as already noted, we need not reach that
    issue here.
    11
    D.
    Several environmental groups, including Petitioners,
    submitted comments in response to the 2013 Proposed Rule.
    Petitioners commented on the feasibility of numerical
    measurability after generation, pointing out the broader
    problem that EPA failed to make any finding that numerical
    emission standards during this extended time frame were
    infeasible under § 7412(h) such that EPA could lawfully
    promulgate the extended period of work practice standards.
    Petitioners argued in their timely comment that “feasible
    ‘measurement methodolog[ies]’” were available in order to
    demonstrate that EPA could not lawfully conclude that work
    practice standards were needed.           J.A. 103 (quoting
    § 7412(h)(2)(B) (alteration in original)).        Additionally,
    Petitioners pointed out that EPA’s work practice standards
    “cannot be less stringent than ‘the average emission limitation
    achieved by the best performing 12 percent of the existing
    sources, respectively.’” J.A. 163 (quoting § 7412(d)(3)).
    E.
    Ultimately, EPA adopted two alternative definitions of
    “startup,” each with its own end point, in the final rule at issue
    here. Reconsideration of Certain Startup/Shutdown Issues, 79
    Fed. Reg. 68,777 (Nov. 19, 2014) (codified at 40 C.F.R.
    § 63.10042) (“Final Rule”). Power plants may choose between
    the definitions because EPA “believe[s] that they both meet the
    requirements of [§ 7412] to reduce HAP emissions during this
    time period . . . .” 
    Id. at 68,780.
    Once startup ends (regardless
    of which definition the plant uses), the plant must then comply
    with the MATS Rule’s numerical emission requirements. 
    Id. at 68,781.
                                    12
    The first startup definition mirrors the original definition
    from the 2012 MATS Rule and the November 2012 action:
    startup begins with “the first-ever firing of fuel in a boiler for
    the purpose of producing electricity, or the firing of fuel in a
    boiler after a shutdown event for any purpose,” and it ends at
    electricity generation. 
    Id. at 68,792.
    This portion of the Final
    Rule is not challenged here.
    The alternative definition evolved from the proposed
    extended definition tested by the 2013 TSD. It defines the
    beginning of startup similarly to the first definition, but defines
    the end of startup as occurring at a later juncture: “Startup
    ends 4 hours after the EGU generates electricity . . . or 4 hours
    after the EGU makes useful thermal energy (such as heat or
    steam) for industrial, commercial, heating, or cooling purposes,
    whichever is earlier.” 
    Id. at 68,792
    (internal citations omitted).
    EPA acknowledged that the 2013 TSD “did not attempt to
    identify the EGUs that were the best performing sources, but
    instead simply looked at a category-wide average time for
    engagement of APCDs.” 
    Id. at 68,782.
    In order to “most
    closely follow[] the requirements” of § 7412(h), EPA “revised”
    its technical support documents to determine which EGUs
    “were able to most quickly engage their [sulfur dioxide and
    nitrogen oxides] APCDs because [EPA] determined that the
    best performing EGUs for purposes of defining the end of
    startup are those that are able to most efficiently engage their
    controls after the start of electricity generation.” 
    Id. We refer
    to this “revised” technical support document as the “Final
    TSD.” Assessment – Revised, EPA-HQ-OAR-2009-0234-
    20447.
    The 2013 Proposed Rule connected the removal efficacy
    of APCDs regulating sulfur dioxide and nitrogen oxides
    emissions to “achiev[ing] operating benchmarks,” 78 Fed. Reg.
    13
    at 38,005, specifically the point where “APCDs needed to
    comply with the requirements of this subpart [became]
    technically or safely capable of operation,” 
    id. at 38,003.
    The
    Final Rule filled in some gaps. According to the Final Rule,
    sulfur dioxide and nitrogen oxides emissions can be proxies of
    other emissions and their APCDs aid in the engagement of
    HAP controls “that industry commenters stated required
    additional time to engage after the start of generation of
    electricity or useful thermal energy.” 79 Fed. Reg. at 68,781.
    The takeaway in the Final Rule was that EPA believed the
    removal efficacy of APCDs regulating sulfur dioxide and
    nitrogen oxides emissions was reliable evidence of when EGUs
    can begin to not only remove pollutants but measure HAP
    emissions. See 
    id. at 68,780.
    F.
    Petitioners submitted a petition for reconsideration of the
    Final Rule that objected to the alternative extended startup
    definition. Specifically, Petitioners objected to EPA’s late-
    breaking selection of the best performing power plants which
    formed the basis of its Final TSD analysis and objected to
    EPA’s conclusion that work practice standards were lawful
    under § 7412(h) beyond electricity generation. EPA denied the
    petition on August 8, 2016. Reconsideration on the [MATS]
    and the Utility New Source Performance Standards Startup and
    Shutdown Provisions; Final Action, 81 Fed. Reg. 52,346,
    52,346 (Aug. 8, 2016). EPA explained why it was denying the
    petition for reconsideration in a separate document
    accompanying the Federal Register notice. See Denial of
    Petitions for Reconsideration of Certain Startup/Shutdown
    Issues: MATS, EPA-HQ-OAR-2009-0234-20581 (July 29,
    2016).
    14
    III.
    Although EPA and Intervenors do not challenge
    Petitioners’ standing under Article III to seek judicial review
    of both the denial of the petition for reconsideration and the
    Final Rule, the Court has an independent obligation to ensure
    standing exists. The Court concludes that because at least one
    Petitioner – Sierra Club – demonstrates standing, this case may
    proceed to the merits. See Ctr. for Biological Diversity v. EPA,
    
    861 F.3d 174
    , 182 (D.C. Cir. 2017) (“When more than one
    association brings suit, we need only find one party with
    standing to satisfy the requirement.” (internal quotation marks
    and citations omitted)).
    Article III of the Constitution provides an association with
    standing to sue “only if (1) at least one of its members would
    have standing to sue in his own right; (2) the interest it seeks to
    protect is germane to its purpose; and (3) neither the claim
    asserted nor the relief requested requires the member to
    participate in the lawsuit. ” Am. Trucking Ass’ns v. Fed. Motor
    Carrier Safety Admin., 
    724 F.3d 243
    , 247 (D.C. Cir. 2013)
    (internal quotation marks and citations omitted). Sierra Club’s
    member’s standing here, as demonstrated in the declaration
    attached to Petitioners’ Reply,4 is clear for the same reasons we
    articulated in previous cases involving these parties:
    [Its] members “unquestionably live[d] within
    zones they claim are exposed to” regulated air
    pollutants and “our vacatur [would] require
    4
    Petitioners submitted declarations from other members with their opening
    brief, but Petitioners later “realized that the power plants harming
    Petitioners’ opening-brief standing declarants have not elected to use the
    extended startup period.” Pet’rs’ Reply Br. 3. We accept the declaration
    submitted with Petitioners’ reply. See Ctr. for Sustainable Econ. v. Jewell,
    
    779 F.3d 588
    , 599 (D.C. Cir. 2015).
    15
    EPA . . . to entertain and respond to the
    [Petitioners’] claims about the necessary scope
    and stringency of the standards” for regulating
    those pollutants. Sierra Club has “shown its
    members’ . . . concrete interest” of a type that
    its asserted procedural interest is “plainly
    designed to protect” and that its injury “is
    potentially redressable” by further agency
    action on remand.
    Sierra Club v. EPA, 
    926 F.3d 844
    , 849 (D.C. Cir. 2019)
    (quoting Sierra Club v. EPA, 
    699 F.3d 530
    , 533 (D.C. Cir.
    2012)). Because the interest Sierra Club seeks to protect is
    germane to its purpose and neither the claim asserted nor the
    relief requested requires the member to participate in the
    lawsuit, Sierra Club has established standing.
    IV.
    As we noted at the outset, Petitioners challenge both
    EPA’s denial of their petition for reconsideration and the Final
    Rule itself. The portions of the petition for reconsideration at
    issue here attack EPA’s determination in the Final Rule that the
    “best performing” power plants cannot reliably measure
    emissions until four hours after they generate electricity. This
    objection is really two-fold. First, Petitioners argue that EPA
    did not analyze which power plants were the “best performers”
    until the Final TSD, thus depriving Petitioners of the
    opportunity to timely comment. Second, Petitioners argue
    EPA’s best-performers analysis was based on an underlying
    assumption that the point at which power plants begin to
    operate their APCDs and remove pollutants can be used as a
    proxy for when it becomes feasible to measure HAP emissions,
    an assumption not disclosed prior to the Final Rule.
    16
    Petitioners seek relief in the form of an order compelling
    EPA to reconsider the Final Rule in light of their objections.
    While Petitioners ask the Court to vacate the denial of the
    petition for reconsideration, they do not ask the Court to vacate
    the Final Rule itself.          At oral argument, Petitioners
    acknowledged that if we remand for reconsideration under
    § 7607(d)(7)(B), we need not reach their additional arguments
    that the Final Rule, as it stands now, is arbitrary and capricious.
    See Oral Arg. Rec. at 22:00-26. Because we conclude that
    Petitioners’ reconsideration petition raised objections that were
    both impracticable to raise during the comment period and
    centrally relevant to the outcome of the Final Rule, see
    § 7607(d)(7)(B), we vacate EPA’s denial of that petition and
    remand for EPA’s reconsideration on these matters.
    In Clean Air Council v. Pruitt, we declined to resolve a
    dispute about whether our review of EPA’s treatment of the
    two § 7607(d)(7)(B) elements is subject to de novo review or
    arbitrary-and-capricious review, concluding that EPA erred
    even under the more deferential arbitrary-and-capricious
    standard. 
    862 F.3d 1
    , 10 (D.C. Cir. 2017) (per curiam). Here,
    Petitioners seek de novo review, arguing that “EPA has no
    greater expertise than this Court in determining whether the
    requirements of § 7607(d)(7)(B) have been satisfied.” Pet’rs’
    Opening Br. 35. EPA does not directly respond to this
    argument, only articulating that the arbitrary-and-capricious
    standard governs its “action in promulgating a rule.” Resp’t’s
    Br. 23. Further complicating matters, we have previously
    applied the abuse-of-discretion standard in cases where we are
    asked to “reverse an agency’s denial of reconsideration.”
    AT&T Corp. v. FCC, 
    363 F.3d 504
    , 509 (D.C. Cir. 2004); see
    North Carolina v. EPA, 614 F. App’x 517, 519 (D.C. Cir. 2015)
    (unpublished decision applying abuse-of-discretion standard,
    citing to AT&T Corp., to review of EPA’s denial of a petition
    for reconsideration under § 7607(d)(7)(B)).
    17
    We need not resolve this issue here, as the same conclusion
    in Clean Air Council can be made here. Even under the more
    deferential arbitrary-and-capricious standard, EPA erred in
    concluding that the two identified issues from Petitioners’
    petition for reconsideration did not meet the two requirements
    for reconsideration under § 7607(d)(7)(B).
    A.
    We conclude that the first element of § 7607(d)(7)(B) is
    met because it was impracticable to raise either of the two
    objections during the period for public comment. The first
    element’s impracticability prong – rather than the “arising
    after” prong – is met “when the final rule was not a logical
    outgrowth of the proposed rule.” Alon Refining Krotz Springs,
    Inc. v. EPA, 
    936 F.3d 628
    , 648 (D.C. Cir. 2019) (per curiam).
    A final rule is the “logical outgrowth” of a
    proposed rule if “interested parties should have
    anticipated that the change was possible, and
    thus reasonably should have filed their
    comments on the subject during the notice-and-
    comment period.” A final rule “fails the logical
    outgrowth test” if “interested parties would
    have had to divine the agency’s unspoken
    thoughts, because the final rule was surprisingly
    distant from the proposed rule.”
    Clear Air 
    Council, 862 F.3d at 10
    (quoting CSX Transp., Inc. v.
    Surface Transp. Bd., 
    584 F.3d 1076
    , 1080 (D.C. Cir. 2009)).
    It is undisputed that the 2013 Proposed Rule was the first
    time that EPA introduced the idea of extending work practice
    standards beyond the point of generation to several hours after
    18
    generation. It is also undisputed that the 2013 Proposed Rule
    and 2013 TSD did not identify which sources were considered
    the “best performing,” and neither referenced the section
    governing when work practice standards may replace
    numerical standards – § 7412(h).
    1.
    The Final Rule’s reliance on an identified list of best
    performing power plants was not a logical outgrowth of the
    2013 Proposed Rule. Given the Proposed Rule’s lack of any
    mention of best performing sources or § 7412(h), Petitioners
    simply could not have anticipated during the comment period
    that EPA would convert the 2013 Proposed Rule – based on
    data of when all power plants engage pollutant controls – into
    an analysis of when then-unidentified best performers could
    engage their controls.
    It is true that Petitioners did comment on the lack of best
    performing source analysis during the comment period. EPA
    argues that this forecloses relief, relying on Portland Cement
    Ass’n v. EPA, for the premise that a final rule is a logical
    outgrowth of the proposed rule where a petitioner commented
    on the issue. 
    665 F.3d 177
    , 189 (D.C. Cir. 2011) (per curiam).
    But in Portland Cement, the Court noted that EPA had sought
    comment on the matter and the petitioner had commented. 
    Id. Portland Cement
    does not stand for the proposition that an
    individual’s comment in and of itself demonstrates sufficient
    notice from EPA to the individual. To the contrary, in
    Petitioners’ cited CSX Transportation, this Court recognized
    that “notice must come from the [Notice of Proposed
    Rulemaking,]” not the comments arising out of 
    it. 584 F.3d at 1082
    . Because nothing in the 2013 Proposed Rule indicated
    EPA was setting its standards based on the best performing
    sources, the Final Rule’s reliance on its newly selected “best
    19
    performers” cannot be considered a logical outgrowth of the
    2013 Proposed Rule. Thus, it was impracticable for Petitioners
    to have raised this challenge during the comment period.
    Besides, even if we did consider the Petitioners’ mention of a
    best-performer analysis as relevant to the logical outgrowth
    test, their comment raised that analysis in a different context.
    Namely, Petitioners’ comment argued that EPA was required
    to apply a best-performer analysis in setting the work-practice
    standards; they said nothing of employing a best-performer
    analysis in order to determine the duration of startup.
    Even if reliance on any “best performing sources” could
    be considered a logical outgrowth, EPA’s process for
    identifying those best performing sources was certainly not. To
    hold otherwise would place the unreasonable burden on
    commenters not only to identify errors in a proposed rule but
    also to contemplate why every theoretical course of correction
    the agency might pursue would be inappropriate or incorrect.
    It was simply impracticable for Petitioners to predict how EPA
    would cure the missing “best performer” component and then
    submit preemptive attacks on such hypothetical solutions. For
    this reason, we find unavailing EPA’s argument that mere
    similarities in analytical approaches of the 2013 TSD and the
    Final TSD render the latter a logical outgrowth of the former.
    EPA gave no notice that it would analyze any best performing
    stringency requirements, so EPA cannot now claim that
    Petitioners were on notice of how EPA would ultimately
    analyze such issues.5 There was simply no opportunity for
    5
    Furthermore, EPA’s argument that it applied the “same analytical
    approach” in the Final TSD as it did in the 2013 TSD is blatantly erroneous.
    Resp’t’s Br. 30 (emphasis added). The process by which EPA went about
    discerning which sources were the best performing required additional
    calculations and data tinkering beyond what EPA did in the 2013 TSD. For
    example, the Final TSD eliminated data from 563 startup events in which
    “electricity generation lasted less than 4 hours before fossil fuel combustion
    20
    Petitioners to weigh in on whether additional factors beyond
    what was considered in the 2013 TSD should be considered
    when determining which sources are the best performing.
    To sum up, Petitioners were not given the opportunity to
    comment on, propose revisions to, or otherwise challenge the
    process for selecting the “best performing” power plants that
    EPA first unveiled in the Final TSD. In this respect, because
    the final rule was not a logical outgrowth of the 2013 Proposed
    Rule, this first objection satisfies the first element of
    § 7607(d)(7)(B).
    2.
    Turning to their second objection, Petitioners argue that
    EPA did not disclose “the critical reasoning behind its
    measurability analysis until its [F]inal [R]ule.” Pet’rs’
    Opening Br. 42. It was only then, say Petitioners, that EPA
    asserted “that the point at which power plants begin to operate
    their pollution controls can be used as a proxy for when they
    can measure emissions,” 
    id., because no
    technologically and
    economically feasible methodology exists to measure HAP
    emissions up until that point, see § 7412(h)(2)(B).
    As we demonstrate above, the Final Rule is the first time
    EPA connects an EGU’s ability to remove pollutants with its
    ability to measure HAP emissions. 
    Id. at 68,779-80.
    EPA is
    correct that the 2013 TSD articulated that it was using certain
    removal efficacies as a proxy for the end of startup. The end
    of startup is clearly the beginning of when emissions are to be
    numerically measured for purposes of complying with existing
    numerical limits set forth in the MATS Rule. But nowhere in
    ended” and then “calculated the 2-hour rolling average emission rate.”
    Final TSD, at 20. The 2013 TSD does not indicate similar methods.
    21
    the 2013 TSD or the 2013 Proposed Rule does EPA express its
    belief that emissions are immeasurable from the point of
    electricity generation until the APCDs become operational.
    This key link is a critical statutory requirement for EPA to
    lawfully deviate from numerical standards and impose
    alternative, non-numerical work practice standards. Simply
    put, the 2013 Proposed Rule failed to disclose that it was using
    APCDs’ effectiveness as a proxy for measurability.
    Again, recognizing that the 2013 Proposed Rule seriously
    lacked compliance with § 7412(h)’s requirements, Petitioners
    timely commented on the measurability of pollutants.
    Petitioners pointed out that EPA failed to make any finding that
    numerical standards remained infeasible after the generation of
    electricity (the startup end point in the first definition) to justify
    work practice standards during the extended period of time in
    the alternative definition. Petitioners’ comment also argued
    that feasible measurement methodologies existed. EPA again
    pounces on this comment, arguing that Petitioners’ timely
    comment on feasibility is sufficient to show that it was not
    impracticable for Petitioners to timely object to the use of
    APCDs as a proxy for measurability.
    We conclude that EPA clearly erred in faulting Petitioners’
    failure to divine from the 2013 TSD that EPA would later
    conclude under § 7412(h)(2)(B) that specific emission
    measurements during startup show that HAP emissions cannot
    be measured in a technologically and economically feasible
    way.
    Despite “conced[ing] that the 2013 Proposal could have
    been more explicit” on this point, EPA doubles down, arguing
    that the challenged premise – “that it was not feasible to
    establish numeric limitations” for HAPs until APCDs became
    operational – “was central” to the 2013 Proposal, Resp’t’s Br.
    22
    32, even though the 2013 Proposal lacks any reference to
    measurement feasibility or § 7412(h).6 But commenters do not
    have to be mind readers, and this is exactly the kind of
    “divin[ation]” of “unspoken thoughts” that the logical
    outgrowth test rejects. Clear Air 
    Council, 862 F.3d at 10
    (quoting CSX Transp., 
    Inc., 584 F.3d at 1080
    ). This second
    objection also passes the first § 7607(d)(7)(B) element.
    B.
    The parties agree that § 7607(d)(7)(B)’s second element,
    central relevance, asks whether the objections provide
    substantial support for the argument that the regulation should
    be revised. Both of Petitioners’ objections surpass that hurdle,
    as they go to the very legality of the Final Rule’s § 7412(h)
    work practice standards for the extended startup period. See
    Kennecott Corp. v. EPA, 
    684 F.2d 1007
    , 1019 (D.C. Cir. 1982)
    (“Because the reasonableness and accuracy of the forecast data
    is critical to whether a smelter can qualify for an NSO,
    [petitioners’] objections to that data, if well-founded, would
    clearly have been ‘of central relevance.’” (citing
    § 7607(d)(7)(B))).
    EPA argues that Petitioners’ objections cannot be centrally
    relevant because they lack merit. We are not so convinced.
    What is clear is that if different best performers are selected,
    the extended startup definition’s end point would have to be
    6
    Intervenors make the same argument, claiming “measurement
    impracticability was a primary issue underlying the entire reconsideration
    proceeding.” Intervenors’ Br. at 10. This may indeed be true for the MATS
    Rule’s definition of startup – and Petitioners do not challenge the feasibility
    of measurability up until generation – but EPA’s radio silence on the matter
    after proposing a new, extended endpoint of startup deprived Petitioners of
    the opportunity to comment on this issue as it applied to an extended period
    of startup.
    23
    recalculated, and unless EPA demonstrates that measurability
    is infeasible until APCDs become operational, work practice
    standards cannot be applied. These issues certainly meet the
    “central relevance” requirement. § 7607(d)(7)(B).
    VI.
    For the foregoing reasons, the Court grants Petition No.
    16-1349, vacates EPA’s denial of the petition for
    reconsideration, and remands to the agency for reconsideration.
    Petition Nos. 15-1015 and 16-1169 are dismissed.
    So ordered.