Alabama Environmental Council v. Administrator, United States Environmental Protection Agency ( 2013 )


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  •                                                       [PUBLISH]
    IN THE UNITED STATES COURT OF APPEALS
    FOR THE ELEVENTH CIRCUIT           FILED
    ________________________ U.S. COURT OF APPEALS
    ELEVENTH CIRCUIT
    MARCH 6, 2013
    No. 08-16961
    JOHN LEY
    ________________________
    CLERK
    Agency No. 40 CFR PART 52
    ALABAMA ENVIRONMENTAL COUNCIL,
    SIERRA CLUB,
    NATURAL RESOURCES DEFENSE COUNCIL,
    OUR CHILDREN’S EARTH FOUNDATION,
    Petitioners,
    versus
    ADMINISTRATOR, UNITED STATES
    ENVIRONMENTAL PROTECTION AGENCY,
    UNITED STATES ENVIRONMENTAL PROTECTION AGENCY,
    Respondents,
    ALABAMA POWER COMPANY,
    TENNESSEE VALLEY AUTHORITY,
    ALABAMA DEPARTMENT OF ENVIRONMENTAL MANAGEMENT,
    Intervenors.
    ________________________
    No. 11-11549
    ________________________
    Agency No. 40 CFR Part 52
    ALABAMA POWER COMPANY,
    Petitioner,
    versus
    UNITED STATES ENVIRONMENTAL PROTECTION AGENCY,
    ADMINISTRATOR,
    UNITED STATES ENVIRONMENTAL PROTECTION AGENCY,
    Respondents,
    ALABAMA ENVIRONMENTAL COUNCIL,
    OUR CHILDREN’S EARTH FOUNDATION,
    SIERRA CLUB,
    Intervenors.
    ________________________
    Petitions for Review of Final Action
    of the United States Environmental Protection Agency
    _________________________
    (March 6, 2013)
    Before TJOFLAT and BLACK, Circuit Judges, and MOLLOY,* District Judge.
    BLACK, Circuit Judge:
    *
    Honorable Donald W. Molloy, United States District Judge for the District of Montana,
    sitting by designation.
    2
    These consolidated appeals focus on a Clean Air Act1 visible emissions
    regulation promulgated by the State of Alabama and submitted to the United
    States Environmental Protection Agency (EPA) as a revision to Alabama’s State
    Implementation Plan (SIP). In 2008, the EPA approved the revision after
    concluding the proposed regulation satisfied the Clean Air Act’s requirements
    (2008 approval). The EPA denied a timely request in 2009 that it reconsider its
    approval, but, when confronted with a second reconsideration request the
    following month, the EPA’s new Acting Regional Administrator granted the
    request. In April of 2009, the EPA moved this Court to grant a limited voluntary
    remand. We granted the motion, remanding the case “on a limited basis for
    purposes of reconsidering the final rule under review.” In 2011, following such
    reconsideration, the EPA disapproved the revision (2011 disapproval).
    Petitions for review of both the 2008 approval and the 2011 disapproval are
    before us. Alabama Power supports the 2008 approval and asks us to affirm the
    approval as the only lawful action the EPA has taken on the proposed regulation.
    The Alabama Environmental Council, Sierra Club, Natural Resources Defense
    Council, and Our Children’s Earth Foundation (Citizens) support the 2011
    1
    42 U.S.C. §§ 7401 et seq.
    3
    disapproval and ask us to affirm that action. The EPA is defending the 2011
    disapproval and contends we should not review the 2008 approval.
    After a discussion of the statutory background and the factual and
    procedural history of the two petitions, we first consider whether the EPA’s 2011
    disapproval was conducted in compliance with the statutory procedures set forth in
    the Clean Air Act. We conclude the 2011 disapproval was unauthorized by the
    Clean Air Act because the EPA failed to make the statutorily required error
    determination. We next reject the EPA’s reliance on its inherent authority and this
    Court’s remand order as authorization for the 2011 disapproval. Finally, we
    address and dismiss challenges to the 2008 approval, and affirm the validity of
    that action.
    I. Statutory Background
    The Clean Air Act aims to “protect and enhance the quality of the Nation’s
    air resources, ” 42 U.S.C. § 7401(b)(1), and “sets out a two-stage process for
    achieving this goal,” Sierra Club v. Ga. Power Co., 
    443 F.3d 1346
    , 1348 (11th
    Cir. 2006). At the first stage, the EPA identifies air pollutants that endanger the
    public, then formulates national ambient air quality standards (NAAQS) to
    regulate these pollutants. 42 U.S.C. § 7409; Ga. Power, 443 F.3d at 1348. At the
    second stage, each state develops a SIP to ensure its air meets the NAAQS for the
    4
    various pollutants. 42 U.S.C. § 7410; Ga. Power, 443 F.3d at 1348. The SIP must
    be submitted for review by the EPA, 42 U.S.C. § 7410(a)(1), and becomes
    federally enforceable once it is approved and adopted by the EPA, 42 U.S.C.
    § 7410(k).
    The Clean Air Act thus provides a cooperative-federalism approach to air
    quality regulation. See Fla. Power & Light Co. v. Costle, 
    650 F.2d 579
    , 581 (5th
    Cir. 1981) (“Congress chose a balanced scheme of state-federal interaction to
    implement the goals of the [Clean Air] Act.”).2 Under this approach, states have
    “primary responsibility for ensuring that the ambient air meets the NAAQS for the
    identified pollutants,” Ky. Res. Council, Inc. v. EPA, 
    467 F.3d 986
    , 988 (6th Cir.
    2006), and “so long as the ultimate effect of a State’s choice of emission
    limitations is compliance with the national standards for ambient air, the State is at
    liberty to adopt whatever mix of emission limitations it deems best suited to its
    particular situation,” Train v. NRDC, Inc., 
    421 U.S. 60
    , 79, 
    95 S. Ct. 1470
    , 1482
    (1975). “The great flexibility accorded the states under the Clean Air Act is . . .
    illustrated by the sharply contrasting, narrow role to be played by the EPA.” Fla.
    Power & Light Co., 650 F.2d at 587. If the SIP revision meets the requirements in
    2
    In Bonner v. City of Prichard, 
    661 F.2d 1206
    , 1209 (11th Cir. 1981) (en banc), this
    Court adopted as binding precedent all decisions of the former Fifth Circuit handed down prior to
    close of business on September 30, 1981.
    5
    the Clean Air Act, the EPA must approve it. See 42 U.S.C. § 7410(k)(3) (“[T]he
    Administrator shall approve [a SIP or SIP revision] as a whole if it meets all of the
    applicable requirements of this chapter.” (emphasis added)).
    To obtain approval by the EPA, the SIP must comply with the Clean Air Act
    requirements set forth at 42 U.S.C. § 7410(a)(2), which mandates, inter alia, the
    inclusion of “enforceable emission limitations and other control measures, means,
    or techniques . . . as may be necessary or appropriate to meet the applicable [Clean
    Air Act] requirements.” 42 U.S.C. § 7410(a)(2)(A); see also Ga. Power, 443 F.3d
    at 1348. Once approved, a SIP may not be unilaterally modified by either the state
    or the EPA: “no . . . plan revision, or other action modifying any requirement of
    an applicable implementation plan may be taken with respect to any stationary
    source by the State or by the Administrator [of the EPA].” 42 U.S.C. § 7410(i).
    The Clean Air Act does, however, provide cooperative processes for modifying a
    SIP that may be initiated by either the EPA or the state.
    A “SIP Call” is one mechanism by which the EPA may initiate a
    modification to a SIP. Clean Air Act § 110(k)(5); 42 U.S.C. § 7410(k)(5).
    Section 110(k)(5), entitled “[c]alls for plan revisions,” outlines the “SIP Call”
    procedure:
    6
    Whenever the Administrator finds that the applicable implementation
    plan for any area is substantially inadequate to attain or maintain the
    relevant national ambient air quality standard . . . the Administrator
    shall require the State to revise the plan as necessary to correct such
    inadequacies. The Administrator shall notify the State of the
    inadequacies, and may establish reasonable deadlines (not to exceed
    18 months after the date of such notice) for the submission of such
    plan revisions. Such findings and notice shall be public.
    42 U.S.C. § 7410(k)(5). Thus, “whenever” the EPA makes a “substantial
    inadequacy” determination, the SIP Call procedure requires the EPA to (1) notify
    the state of the substantial inadequacy, and (2) give the state the first opportunity
    to revise the SIP to conform with the Clean Air Act. Id.
    Prior to 1990, a SIP Call was the only mechanism by which the EPA could
    initiate a modification to a SIP. In 1990, however, Congress added a separate
    provision permitting the EPA to initiate a “correction” to a SIP or SIP revision
    which had been approved or disapproved “in error.” Clean Air Act § 110(k)(6);
    42 U.S.C. § 7410(k)(6). Section 110(k)(6), entitled “[c]orrections,” provides:
    Whenever the Administrator determines that the Administrator’s
    action approving, disapproving, or promulgating any plan or plan
    revision (or part thereof) . . . was in error, the Administrator may in
    the same manner as the approval, disapproval, or promulgation revise
    such action as appropriate without requiring any further submission
    from the State. Such determination and the basis thereof shall be
    provided to the State and public.
    7
    42 U.S.C. § 7410(k)(6). In contrast to the SIP Call procedure, Section 110(k)(6)
    permits the EPA, after determining a prior action approving or disapproving a plan
    revision “was in error,” to revise the action without “requiring any further
    submission from the State.” Id. Section 110(k)(6) provides a procedure for the
    EPA to follow in revising the prior action: the action may be revised “in the same
    manner as the approval, disapproval, or promulgation,” and the “determination and
    basis thereof shall be provided to the State and public.” Id.
    A state may also voluntarily initiate a revision to its SIP. 42 U.S.C.
    § 7410(a)(1). “If a state wants to add, delete, or otherwise modify any SIP
    provision, it must submit the proposed change to EPA for approval.” Sierra Club
    v. Tenn. Valley Auth., 
    430 F.3d 1337
    , 1346 (11th Cir. 2005) (citing 40 C.F.R.
    § 52.1384). Before adopting and submitting the revision to the EPA, the state
    must hold public hearings and accept public comments. 42 U.S.C. § 7410(a);
    Tenn. Valley Auth., 430 F.3d at 1348 (citing 40 C.F.R. § 51.102). The EPA “shall
    not” approve a SIP revision “if the revision would interfere with any applicable
    requirement concerning attainment and reasonable further progress . . . or any
    other applicable requirement of [the Clean Air Act].” Clean Air Act § 110(l); 42
    U.S.C. § 7410(l).
    II. Factual and Procedural Background
    8
    Under the scheme set forth in the Clean Air Act, Alabama—through the
    Alabama Department of Environmental Management (ADEM), and its oversight
    body, the Alabama Environmental Management Commission (AEMC)—is the
    primary regulator of the state industries’ visible emissions.3 Of relevance here, the
    visible emissions portion of Alabama’s SIP regulates opacity, which is “one of the
    most basic emission limitations imposed on sources of particulate air pollution.”
    Tenn. Valley Auth., 430 F.3d at 1341. Opacity is not a pollutant; rather, it “is a
    measure of the light-blocking property of a plant’s emissions, which is important
    in the Clean Air Act regulatory scheme as an indicator of the amount of visible
    particulate pollution being discharged by a source.” Id. Opacity is thus related to
    particulate matter (PM), a regulated pollutant under the Clean Air Act.
    Alabama’s SIP judges compliance with opacity regulations using the EPA
    Method 9 test, which is a visual observation by a trained human observer. Ala.
    Admin. Code r. 335-3-4-.01(2). As a supplement to the Method 9 test, but not a
    replacement, Alabama’s SIP requires certain facilities to operate a continuous
    opacity monitoring system (COMS), id. at 335-3-12-.02, which is an electronic
    3
    Alabama’s SIP is codified at 40 C.F.R. § 52.69 and incorporates by reference certain
    provisions of ADEM’s Air Pollution Control Program regulations set out at Ala. Admin. Code r.
    335-3-1 et seq. ADEM develops SIP regulations, which are approved, disapproved, or modified
    by the AEMC. See Ala. Code § 22-22A-8.
    9
    device that records opacity measurements every six-minutes, as a six-minute
    average. A COMS thus produces up to 240 separate readings per day, and these
    “[m]ore frequent readings with COMS help determine whether a source is
    following good air pollution control practices between Method 9 . . . tests.”
    Alabama: Proposed Approval of Revisions to the Visible Emissions Rule, 72 Fed.
    Reg. 18,428, 18,431 (April 12, 2007).
    For well over a decade, Alabama’s SIP has prohibited sources from emitting
    at levels beyond 20% opacity, as determined by a six-minute average. Ala.
    Admin. Code r. 335-3-4-.01(1)(a)(1996). There are exceptions. One exception
    permits up to 100% opacity during “startup, shutdown, load change, and rate
    change or other short, intermittent periods of time” as approved by ADEM. Id. at
    335-3-4-.01(1)(c). Another exception permits up to 40% opacity during one six-
    minute period every hour. Id. at 335-3-4-.01(1)(b). In 2003, however, ADEM
    sought to broaden the 40% exception to allow sources with COMS to emit “up to
    100 percent opacity for up to two percent of the quarterly operating time that they
    are otherwise subject to the 20 percent opacity limit.” 72 Fed. Reg. at 18,431.
    The EPA’s handling of a subsequent iteration of this proposed revision is the
    central issue on appeal.
    A.    Alabama’s 2003 Proposed Revision to the Visible Emissions Rule
    10
    ADEM formally adopted the proposed revision—also known as the “2% de
    minimis rule”—and submitted it to the EPA as a SIP revision in 2003. Tenn.
    Valley Auth., 430 F.3d at 1342. The rule provided a safe harbor from the 20%
    opacity limitation if “‘[d]uring each calendar quarter . . . the non-exempt excess
    emissions periods do not exceed 2.0 percent of the source operating hours for
    which the opacity standard is applicable and for which the COMS is indicating
    valid data.’” Id. (quoting Ala. Admin. Code r. 335-3-4-.01(4)). Prior to formally
    adopting the 2003 proposed revision, ADEM had followed the rule for years in
    practice, informally using it “to excuse thousands of opacity violations.” Id. at
    1342, 1348.
    While the EPA was reviewing the 2003 proposed revision, this Court issued
    a decision in a citizen suit brought against Tennessee Valley Authority (TVA)
    using COMS data. Tenn. Valley Auth., 430 F.3d at 1337. We considered whether
    the “2% de minimis rule”—which had yet to be approved by the EPA and thus was
    not yet part of Alabama’s SIP—applied to alleged opacity violations by TVA
    occurring between 1997 and 2002. Id. at 1339. We noted that the rule, followed
    only as an informal practice at all times relevant to the suit, was “tantamount to an
    unapproved modification of the opacity limitation contained in the Alabama SIP.”
    Id. at 1346–47. Because ADEM had attempted “to unilaterally revise the opacity
    11
    limitation without submitting the revision to the rigors of the SIP amendment
    process,” id. at 1348, we held that “ADEM’s practice of employing the 2% de
    minimis rule to determine violations of the 20% opacity limitation using COMS
    data was invalid under Clean Air Act § 110(i),” id. at 1349.
    Subsequent to our decision in Tennessee Valley Authority, in April 2007,
    the EPA concluded that ADEM’s 2003 proposed revision was “not approvable as
    submitted.” Alabama: Proposed Approval of Revisions to the Visible Emissions
    Rule, 72 Fed. Reg. 18,428, 18,430 (April 12, 2007). The EPA proposed to
    approve the revision if ADEM supplemented the request to show that opacity
    levels, “averaged” over a quarter of a year, would be at least as stringent as
    existing law. Id. at 18,430–31. The EPA notified and provided the public with an
    opportunity to comment on the conditional proposal to approve ADEM’s request.
    72 Fed. Reg. at 18,434. Citizens provided comments, urging the agency to
    disapprove the revision. Comments urging approval were submitted by ADEM,
    TVA, and the Utility Air Regulatory Group (UARG).4
    B.     The EPA’s 2008 Approval of Alabama’s SIP Revision
    4
    The UARG moved for leave to file an amicus brief in support of Alabama Power and
    vacatur of the 2011 disapproval. The UARG’s motion is hereby denied.
    12
    ADEM made the revisions requested by the EPA, as well as additional
    revisions to address public comments. First, ADEM clarified that the once-per-
    hour allowance of up to 40% opacity would not apply to sources using COMS.
    Ala. Admin. Code r. 335-3-4-.01(4) (2008).5 Second, for sources using COMS,
    ADEM added a cap on daily average opacity of 22%, which was the effective
    allowable daily average opacity for those sources under the unrevised rule. Ala.
    Admin. Code r. 335-3-4-.01(5) (2008).6 ADEM issued public notice of the
    revision, took public comment, and held a public hearing. On August 22, 2008,
    AEMC adopted the rule, and ADEM submitted the proposed revision to the EPA
    for review.
    On October 15, 2008, the EPA approved ADEM’s revision request. See
    Alabama: Approval of Revisions to the Visible Emissions Rule, 73 Fed. Reg.
    5
    Paragraph four describes the exception as follows:
    [D]uring each calendar quarter, the permittee may discharge into the atmosphere
    from any emissions unit qualifying under paragraph (3) of this rule, particulate
    with an opacity exceeding 20% for not more than twenty-four (24), six (6) minute
    periods in any calendar day, if such periods do not exceed 2.0 percent of the
    source calendar quarter operating hours for which the opacity standard is
    applicable and for which the COMS is indicating valid data.
    Ala. Admin. Code r. 335-3-4-.01(4) (2008).
    6
    Specifically, paragraph five states: “No permittee shall discharge into the atmosphere
    from any source of emission particulate of an opacity greater than 22% (excluding exempt
    periods allowed under subparagraphs (1)(c) and (1)(d) of this rule) averaged over each calendar
    day.” Ala. Admin. Code r. 335-3-4-.01(5) (2008).
    13
    60,957 (October 15, 2008). The EPA determined that ADEM had made “the
    necessary revisions proposed by EPA” and that the changes were consistent with
    the EPA’s recommendations. Id. at 60,957–58. The EPA noted that the
    “modeling presented by commenters show[ed] the possibility of an impact on the
    NAAQS under a worst-case scenario.” Id. at 60,962. However, the EPA
    concluded it lacked “the data necessary to determine quantitatively what impact, if
    any, the revisions . . . would or could have on . . . PM emissions,” id., and thus
    determined “the proposed SIP revision satisfie[d] the requirements of section
    110(l) of the [Clean Air Act],” id. at 60,959.
    The EPA’s approval became final and effective on November 14, 2008. Id.
    at 60,957. At that point, the proposed revision became part of the federally
    approved Alabama SIP. Sources operating COMS were required to comply with
    the revisions “within 6 months of . . . EPA approval.” Ala. Admin. Code r. 335-3-
    4-.01(7) (2008). Citizens petitioned the EPA to reconsider its approval, but the
    EPA denied the request on January 15, 2009.
    C.    Citizens’ Judicial Challenge to the EPA’s 2008 Approval
    On December 12, 2008, Citizens filed a petition in this Court for review of
    the EPA’s approval of the SIP revision. Alabama Power, ADEM, and TVA
    intervened in support of the EPA’s approval. On February 25, 2009, Citizens filed
    14
    a second reconsideration request with the EPA. The EPA’s new Acting Regional
    Administrator granted the second reconsideration request on April 3, 2009.7
    On April 9, 2009, the EPA moved this Court for a voluntary remand. The
    motion noted the Citizens’ second reconsideration request raised “legal, technical
    and policy issues that warrant additional review,” and stated the remand would
    allow the EPA “to conduct further administrative proceedings and provide an
    opportunity for additional public comment on the final rule.” Alabama Power,
    ADEM, and TVA opposed the motion, asserting that such reconsideration was
    unlawful. The EPA responded and reiterated that it intended to reconsider the
    revision “through a public rulemaking process that includes both notice and an
    opportunity for comment.” On September 28, 2009, we granted the EPA’s motion
    and remanded the case to the EPA “on a limited basis for purposes of
    reconsidering the final rule under review.” We also stayed proceedings in the
    Court “pending completion of such reconsideration.”
    D.     The EPA’s 2011 Disapproval of Alabama’s SIP Revision
    7
    On April 7, 2009, Alabama Power filed a petition for review of the EPA’s decision
    granting the second reconsideration request (2009 petition). In our September 28, 2009, order
    addressing the EPA’s motion for voluntary remand, we also granted the EPA’s motion to dismiss
    the 2009 petition for lack of jurisdiction.
    15
    While the proceedings were stayed, on remand, the EPA published a notice
    in the Federal Register on October 2, 2009, proposing “to either affirm the
    previous rulemaking (which approved the revisions) or, alternatively, amend its
    previous rulemaking (i.e., disapproving the revisions).” Alabama: Proposed
    Approval of Revisions to the Visible Emissions Rule and Alternative Proposed
    Disapproval of Revisions to the Visible Emissions Rule, 74 Fed. Reg. 50,930
    (October 2, 2009). The EPA sought “public comment on the nature of the
    relationship between opacity and [particulate matter] emissions over both the short
    and long term and when the opacity and [particulate matter] mass emissions may
    have a predictable relationship to one another (e.g., when an opacity level of a
    certain amount would predict a [particulate matter] mass emission of another
    certain amount).” 74 Fed. Reg. at 50,934. The EPA provided a 75-day
    opportunity for public comment. Citizens and other interested persons submitted
    comments urging reversal of the 2008 approval; ADEM, Alabama Power, TVA,
    and UARG submitted comments in support of the 2008 approval.
    On April 6, 2011, the EPA published a “Final Rule” disapproving ADEM’s
    request to revise the visible emissions portion of Alabama’s SIP. Alabama: Final
    Disapproval of Revisions to the Visible Emissions Rule, 76 Fed. Reg. 18,870
    (April 6, 2011). The EPA concluded there was “a sufficient likelihood that the
    16
    SIP revision at issue in this action could allow increased mass emissions over what
    would have been allowed under the previously approved SIP rule and that, in the
    absence of additional information or limitations, the revision is not approvable
    under section 110(l).” 76 Fed. Reg. at 18,876. The EPA noted it would “not have
    previously proposed approval if the record clearly demonstrated that the rule
    would have resulted in increased [particulate matter] in nonattainment areas.” 76
    Fed. Reg. at 18,884. Although the EPA’s 2008 approval was based in part on the
    22% average daily opacity cap, following reconsideration, the EPA no longer
    accepted “that the average daily opacity limit is an appropriate or effective tool for
    evaluating the impact” of the revision on particulate matter emissions. 76 Fed.
    Reg. at 18,884. As a result of the EPA’s disapproval, “Alabama’s visible
    emissions rule that was in the SIP prior to the October 15, 2008, final action
    [became] the current SIP-approved rule.” 76 Fed. Reg. at 18,870.
    E.    Consolidation of the 2008 and 2011 Petitions
    On April 8, 2011, Alabama Power filed a petition in this Court for review of
    the EPA’s 2011 disapproval of the SIP revision. Citizens intervened in support of
    the EPA’s disapproval. Alabama Power moved to consolidate Citizens’ 2008
    petition with Alabama Power’s 2011 petition, and to stay the EPA’s disapproval
    pending appeal. Citizens moved to stay their 2008 petition pending resolution of
    17
    Alabama Power’s 2011 petition. On May 12, 2011, we denied both motions to
    stay but granted Alabama Power’s motion to consolidate the 2008 and 2011
    petitions, treating the competing petitions as cross-appeals under Federal Rule of
    Appellate Procedure 28.1.
    III. Standard of Review
    Both petitions for review of the EPA’s actions are brought pursuant to 42
    U.S.C. § 7607(b)(1). We apply “the deferential standard of review set forth in the
    Administrative Procedure Act.” Sierra Club v. Johnson, 
    436 F.3d 1269
    , 1273
    (11th Cir. 2006). Under this standard, a final agency action will be set aside if it is
    “arbitrary, capricious, an abuse of discretion, or otherwise not in accordance with
    law”; exceeds the agency’s statutory authority; or is “without observance of
    procedure required by law.” 5 U.S.C. § 706(2)(A), (C), & (D). “Under this
    standard, we give deference to a final agency decision by reviewing for clear error,
    and we cannot substitute our own judgment for that of the agency.” Johnson, 436
    F.3d at 1273.
    A challenge to the EPA’s interpretation of the Clean Air Act is governed by
    the two-step analysis in Chevron U.S.A., Inc. v. NRDC, Inc., 
    467 U.S. 837
    ,
    842–45, 
    104 S. Ct. 2778
    , 2781–83 (1984). First, we determine “whether Congress
    has directly spoken to the precise question at issue.” Chevron, 467 U.S. at 842,
    18
    104 S. Ct. at 2781. If Congress’s intent is clear from the statutory language, we
    must “give effect to the unambiguously expressed intent of Congress.” Id. at 843,
    104 S. Ct. at 2781. Second, if Congress has not spoken and the statute is “silent or
    ambiguous with respect to the specific issue, the question for the court is whether
    the agency’s answer is based on a permissible construction of the statute.” Id. at
    843, 104 S. Ct. at 2782.
    IV. Discussion
    We are presented with challenges to both the 2008 approval and the 2011
    disapproval in this consolidated appeal. We begin with the 2011 disapproval and
    consider whether the EPA complied with the statutory procedures set forth in the
    Clean Air Act. Because the EPA failed to make the statutorily required error
    determination, we conclude the 2011 disapproval was not authorized by the Clean
    Air Act. We also conclude the EPA’s 2011 disapproval was not authorized by
    either its inherent authority or by this Court, and must therefore be vacated. We
    then address and dismiss challenges to the 2008 approval, and affirm the validity
    of that action.
    A.    The EPA’s 2011 Disapproval of Alabama’s SIP Revision
    Alabama Power contends the EPA’s 2011 disapproval was unauthorized by
    law because the SIP Call procedure outlined in Section 110(k)(5) of the Clean Air
    19
    Act was the only process by which the EPA could revise Alabama’s SIP. The
    EPA claims the 2011 disapproval was authorized by Section 110(k)(6) of the
    Clean Air Act because the EPA erroneously approved the SIP revision in 2008.
    Additionally, the EPA claims the 2011 disapproval was authorized by its inherent
    authority and by this Court’s September 28, 2009, remand order.8
    1. Whether the Clean Air Act Authorized the EPA’s 2011 Disapproval
    We first reject Alabama Power’s contention that the SIP Call process
    outlined in Section 110(k)(5) was the exclusive procedure by which the EPA
    could revise Alabama’s SIP.9 As discussed previously, “[w]henever the
    8
    The EPA also contends Section 553(e) of the Administrative Procedure Act (APA),
    which gives “an interested person the right to petition for the issuance, amendment, or repeal of a
    rule,” authorized the 2011 disapproval. 5 U.S.C. § 553(e). While Section 553(e) authorized
    Citizens to petition for repeal of the 2008 approval, that provision does not displace the
    procedural requirements of the Clean Air Act for SIP revisions and error corrections. See 5
    U.S.C. § 559 (stating the APA does “not limit or repeal additional requirements imposed by
    statute or otherwise recognized by law”). Thus, we must still consider whether the EPA’s 2011
    disapproval complied with the procedures set forth in the Clean Air Act.
    9
    For this contention, Alabama Power cites language from this Court’s decision in
    Georgia Power, a citizen enforcement action in which we rejected Sierra Club’s argument that a
    1999 Guidance Policy issued by the EPA had the effect of revising Georgia’s SIP. 443 F.3d at
    1354. We stated that “even if the EPA had intended its 1999 policy to alter the meaning of
    Georgia’s existing” SIP, “the EPA would have been powerless to effect such a change absent
    formal SIP revision.” Id. Citing the SIP Call provision, we noted that “[i]f the EPA believes that
    its current interpretation of the Clean Air Act requires Georgia to modify its [SIP], the EPA
    should require the state to revise its SIP to conform to EPA policy.” Id. at 1355. Although
    Alabama Power contends Georgia Power established the SIP Call procedure as the exclusive
    procedure by which the EPA may reverse its initial approval, the cited language was in the
    context of analyzing Sierra Club’s argument that an EPA policy document effected a change to a
    SIP. Moreover, the EPA itself stated that the Georgia SIP remained in effect regardless of the
    1999 Guidance policy. Id. at 1354 n.12.
    20
    Administrator finds [the SIP] substantially inadequate,” Section 110(k)(5) requires
    the EPA to notify the state of the substantial inadequacy, and then give the state
    the first opportunity to revise the SIP to conform with the Clean Air Act. 42
    U.S.C. § 7410(k)(5). While Section 110(k)(5) provides an avenue for revising a
    substantially inadequate SIP, Section 110(k)(6) provides an avenue for correcting
    a SIP revision approved in error. Here, the EPA does not contend Alabama’s SIP
    was “substantially inadequate”; rather, the EPA is claiming it made an “error” in
    2008 when it initially approved the SIP revision. Thus, for our purposes, the
    lawfulness of the 2011 disapproval hinges on whether Section 110(k)(6)
    authorized the EPA’s action.
    Section 110(k)(6) permits the EPA to “revise” a SIP provision approved “in
    error” without “any further submission from the State.” 42 U.S.C. § 7410(k)(6).
    Section 110(k)(6) “may” be invoked “[w]henever the Administrator determines
    that the Administrator’s action approving, disapproving, or promulgating any plan
    or plan revision (or part thereof) . . . was in error.” Id. The statute provides the
    procedure for correcting or “revis[ing]” the erroneous action: “the Administrator
    may in the same manner as the approval, disapproval, or promulgation revise such
    action as appropriate without requiring any further submission from the State.” Id.
    21
    The statute requires that “[s]uch determination and the basis thereof shall be
    provided to the State and public.” Id.
    As the plain language shows, Section 110(k)(6) has both discretionary and
    mandatory features. Through the use of the terms “whenever” and “may,” Section
    110(k)(6) confers discretion on the EPA to decide if and when it will invoke the
    statute to revise a prior action. See, e.g., N.Y. Pub. Interest Research Grp. v.
    Whitman, 
    321 F.3d 316
    , 330–31 (2d Cir. 2003) (stating that the phrase
    “[w]henever the Administrator makes a determination” in Section 502(i)(1) of the
    Clean Air Act grants the EPA “discretion whether to make a determination”). To
    invoke Section 110(k)(6), however, the plain language of the statute requires a
    determination by the Administrator that “the action approving . . . [the] plan
    revision . . . was in error.” 42 U.S.C. § 7410(k)(6); see also Chevron, 467 U.S. at
    843, 104 S. Ct. at 2781 (noting the court must “give effect to the unambiguously
    expressed intent of Congress”). Our conclusion that the error determination is
    mandatory to invoke Section 110(k)(6)’s procedure is based on the last provision
    of the statute, which, using mandatory “shall” language, requires that the EPA
    provide “the State and public” with its error “determination and the basis thereof.”
    42 U.S.C. § 7410(k)(6). Thus, if the EPA chooses to invoke Section 110(k)(6) to
    22
    revise a prior action, Congress has required the EPA to articulate an “error” and
    provide “the basis” of its determination that an error occurred.
    Here, the EPA has been unable to point to a determination of the error
    committed in the 2008 approval. Neither the text of the final rule disapproving the
    revision published in the Federal Register, nor the record before this Court, reveal
    that the EPA affirmatively made the requisite error determination. See Motor
    Vehicle Mfrs. Ass’n of the U.S., Inc. v. State Farm Mut. Auto. Ins. Co., 
    463 U.S. 29
    , 50, 
    103 S. Ct. 2856
    , 2870 (1983) (“[A]n agency’s action must be upheld, if at
    all, on the basis articulated by the agency itself.”). Section 110(k)(6) is only
    referred to in passing in the final rule, when the “EPA notes that the process it has
    used for reconsidering and disapproving this SIP revision is entirely consistent
    with the process required under [S]ection 110(k)(6).” 76 Fed. Reg. at 18,878 n.18.
    Nowhere in the final rule does the EPA clearly articulate the alleged “error”
    committed in 2008 at the time of the initial approval. See generally 76 Fed. Reg.
    18,870. We decline to speculate as to the error “determination and the basis
    thereof” when the EPA itself has failed to provide a cognizable error
    determination. See Investacorp, Inc. v. Arabian Inv. Banking Corp. (Investcorp)
    E.C., 
    931 F.2d 1519
    , 1524 (11th Cir. 1991) (“Although we will bestow proper
    respect to the determinations of the [agency], we will not defer to an ethereal
    23
    determination that is not affirmatively stated by the administrative agency.”); see
    also Mitchell Energy Corp. v. FERC, 
    651 F.2d 414
    , 418 (5th Cir. 1981) (“If the
    administrative action is to be tested by the basis upon which it purports to rest, that
    basis must be set forth with such clarity as to be understandable. It will not do for
    a court to be compelled to guess at the theory underlying the agency’s action; nor
    can a court be expected to chisel that which must be precise from what the agency
    has left vague and indecisive.” (quoting SEC v. Chenery Corp., 
    332 U.S. 194
    ,
    196–97, 
    67 S. Ct. 1575
    , 1577 (1947)). As such, the EPA has not complied with
    the procedural demands Congress articulated in Section 110(k)(6).10
    Moreover, the EPA has failed to clarify the ambiguity surrounding the error
    committed in the 2008 approval despite opportunities to do so.11 Although the
    EPA’s brief relies on Section 110(k)(6) as authority for the 2011 “error
    correction,” the brief fails to provide a clear statement of the error committed in
    the 2008 approval. In an effort to understand the EPA’s assertion of error, we
    10
    Although the dissent concludes the EPA’s 2011 interpretation of Section 110(l) was
    substantively permissible, we do not reach this issue because the EPA failed to follow the Clean
    Air Act’s mandate to provide “the State and public” with its error “determination and the basis
    thereof.” 42 U.S.C. § 7410(k)(6).
    11
    We note that we are reluctant to accept litigation positions as official justifications for
    agency action. See, e.g., Gonzalez v. Reno, 
    212 F.3d 1338
    , 1350 (11th Cir. 2000) (“An after-the-
    fact rationalization of agency action—an explanation developed for the sole purpose of defending
    in court the agency’s acts—is usually entitled to no deference from the courts.”).
    24
    focused on this issue at oral argument. However, when questioned as to where we
    would find a statement in the record from the EPA regarding the error committed
    in the 2008 approval, counsel for the EPA stated “[y]ou are not going to find it in
    the Federal Register notice.” Rather, counsel directed us to the EPA’s 2009
    motion for voluntary remand, which stated “the agency has determined that its
    prior action may have been in error or inadequately explained.”
    A statement in a motion for voluntary remand that there “may have been”
    error is insufficient to invoke Section 110(k)(6) as authority to revise a SIP.
    Section 110(k)(6) requires that the “determination and the basis thereof shall be
    provided to the State and public,” such that the mere possibility of error is
    inadequate. Here, we are simply unable to locate the statutorily required error
    determination in the record so that we may evaluate whether the EPA’s application
    of Section 110(k)(6) was appropriate. The EPA itself cannot point to the error
    committed in the 2008 approval; we are not permitted to rummage through the
    record and cobble one together for them.12 See Bowman Transp., Inc. v. Arkansas-
    12
    Although the dissent infers error from a combination of EPA comments, we decline to
    do so. At most, the EPA’s statements in the record indicate that its 2008 findings were
    comparatively less strong than its 2011 findings, based on a different interpretation of Section
    110(1). If we conclude this combination of EPA record statements constitutes an error
    determination under Section 110(k)(6), it is hard to imagine any statement by the EPA that would
    not qualify so long as the EPA argues, as it did here, that its prior findings could have been
    better. If the EPA would like to affirmatively declare the 2008 approach erroneous, our opinion
    leaves it free to do so, so long as it follows Congress’s statutory procedures.
    25
    Best Freight Sys., Inc., 
    419 U.S. 281
    , 285–86, 
    95 S. Ct. 438
    , 442 (1974) (noting
    that under the APA standard of review, courts may not supply “a reasoned basis
    for the agency’s action that the agency itself has not given”); see also Camp v.
    Pitts, 
    411 U.S. 138
    , 142, 
    93 S. Ct. 1241
    , 1244 (1973) (stating that under the APA
    standard of review, “the focal point for judicial review should be the
    administrative record already in existence”).
    The EPA is fully capable of articulating an error when proceeding under
    Section 110(k)(6). For example, in a Federal Register notice issued one month
    after the final rule at issue here, the EPA invoked Section 110(k)(6) for authority
    to correct its previous full approval of Texas’s Clean Air Act Prevention of
    Significant Deterioration (PSD) program. Determinations Concerning Need for
    Error Correction, Partial Approval and Partial Disapproval, and Federal
    Implementation Plan Regarding Texas’s Prevention of Significant Deterioration
    Program, 76 Fed. Reg. 25,178 (May 3, 2011). The EPA explicitly articulated the
    error committed at the time of the prior action: “[The] EPA is determining in this
    rulemaking that it erred in fully approving Texas’s PSD program in 1992 because
    at that time, the program had a gap, which recent statements by Texas have made
    particularly evident.” 76 Fed. Reg. at 25,179. The EPA then took action “through
    26
    the error-correction mechanism provided under” Section 110(k)(6) to correct the
    1992 error, revising its previous full approval to a partial disapproval. Id.13
    Here, as the EPA conceded at oral argument, there is no such explicit error
    determination in the Federal Register notice for the SIP revision at issue. We are
    13
    The EPA’s clear invocation of Section 110(k)(6) in the 2011 correction of Texas’s
    PSD program is not an outlier. In fact, articulating an error to invoke Section 110(k)(6) appears
    to have been the EPA’s consistent practice and interpretation of Congress’s procedural
    requirements for at least 15 years. See Limitation of Approval of Prevention of Significant
    Deterioration Provisions Concerning Greenhouse Gas Emitting-Sources in State Implementation
    Plans; Final Rule, 75 Fed. Reg. 82,536, 82,543–45 (Dec. 30, 2010) (identifying errors clearly and
    specifically invoking the error correction method of Section 110(k)(6)); Approval and
    Promulgation of Implementation Plans; Kentucky: Approval of Revisions to the State
    Implementation Plan, 75 Fed. Reg. 2,440, 2,440–41 (January 15, 2010) (“EPA has determined
    that [the state’s] rule . . . was erroneously incorporated into the SIP because the rule is not related
    to the attainment and maintenance of the national ambient air quality standards.”); see also id. at
    2441 (specifying clearly that it was “removing” a previously approved rule “pursuant to section
    110(k)(6) of the Clean Air Act” in order to “correct[]” its “error”); id. at 2443 (explaining that
    the rule being deleted “was erroneously incorporated into the SIP because it does not relate to the
    implementation, maintenance, and enforcement of the NAAQS in Kentucky”); Designation of
    Areas for Air Quality Planning Purposes; Arizona; Correction of Boundary of Phoenix
    Metropolitan 1-Hour Ozone Nonattainment Area, 70 Fed. Reg. 68,339, 68,339 (November 10,
    2005) (declaring that the “EPA is taking direct final action to correct” its prior determination
    “under the authority of section 110(k)(6) of the Clean Air Act”); see also id. at 68,343 (“Based
    on the historic ambient monitoring data and prevailing wind patterns in the area, we conclude
    that we clearly erred in failing to consider data made available at the time of our September 1979
    affirmation . . . .”); id. (concluding that based on overlooked data, the agency’s prior boundary
    determination “was erroneous”); id. at 68,345 (stating that the agency’s action was intended to
    “remov[e] unnecessary obligations that flow[ed] from the erroneous inclusion” of a portion of
    land in the EPA’s boundary determination); Designation of Areas for Air Quality Planning
    Purposes; Correction of Designation of Nonclassified Ozone Nonattainment Areas; States of
    Maine and New Hampshire, 62 Fed. Reg. 14,641, 14,641 (March 27, 1997) (announcing the
    EPA’s “decision to correct” its prior ozone designations “pursuant to section 110(k)(6) of the
    Clean Air Act (the Act), which allows the USEPA to correct its actions”); see also id. at 14,642
    (concluding that its “earlier action . . . was in error,” because the “information submitted by [the
    state] did not provide enough data” to make the designation); id. (declaring itself to be
    “correcting [an] error” based on “clearly inadequate” “information available at the time of the
    designation”).
    27
    not holding that “magic words” are required to invoke Section 110(k)(6). But,
    Congress has demanded, at a minimum, that the EPA affirmatively articulate the
    error committed at the time of the initial action if it chooses to rely on its Section
    110(k)(6) authority to later revise that action.14
    To recap, the Clean Air Act contains two provisions that grant the EPA
    authority to revise a SIP: Sections 110(k)(5) and (k)(6). 42 U.S.C. §§ 7410(k)(5)
    & (6). The EPA does not purport to rely on the SIP Call procedures set forth in
    Section 110(k)(5), nor could it, as there was never a finding of substantial
    inadequacy. 42 U.S.C. § 7410(k)(5). Although the EPA does purport to rely on
    the error-correction mechanism provided in Section 110(k)(6), the EPA did not
    “provide[] . . . the State and public” with the error determination Congress
    requires. 42 U.S.C. § 7410(k)(6). Thus, we conclude the EPA did not act in
    accordance with the Clean Air Act in the 2011 disapproval of Alabama’s visible
    emissions SIP revision.
    14
    The dissent’s approach of inferring error where such error has not been affirmatively
    articulated by the EPA would limit the EPA’s future ability to change policies. As the dissent
    points out, it is not “unusual for a change in philosophy within an agency to result in a policy
    about-face.” However, a change in policy does not in and of itself indicate that the prior
    enforcement policy was erroneous, as there can be multiple permissible agency interpretations of
    a statute. Chevron, 467 U.S. at 843 n.11, 104 S. Ct. at 2782 n.11. It is at least feasible that a
    change in administration would result in the EPA applying a 2008-type approach to Section
    110(l)’s enforcement, and to declare this approach erroneous, without the EPA having done so
    itself, would limit the EPA’s future enforcement flexibility.
    28
    2. Whether the EPA Acted Within its Inherent Authority in Issuing the 2011
    Disapproval
    As additional justification for the 2011 disapproval, the EPA contends it
    was acting within its inherent authority to reconsider decisions. 76 Fed. Reg. at
    18,877–78. The EPA relies on Gun South, Inc. v. Brady, 
    877 F.2d 858
     (11th Cir.
    1989), and New Jersey v. EPA, 
    517 F.3d 574
     (D.C. Cir. 2008), as support for its
    claim of inherent authority. We conclude the EPA cannot rely on any inherent
    authority here, where Congress has provided specific statutory procedures for
    revising a SIP. See 42 U.S.C. § 7410(k)(5), (k)(6).
    Gun South considered the authority of the Bureau of Alcohol, Tobacco, and
    Firearms (Bureau) to temporarily suspend the importation of assault rifles under
    the Gun Control Act. Gun S., 877 F.2d at 860–61. After noting neither the Gun
    Control Act nor its implementing regulations expressly authorized the suspension,
    we concluded “the Bureau must necessarily retain the power to correct the
    erroneous approval of firearms import applications,” as well as “the corollary
    power to temporarily suspend the importation of firearms.” Id. at 862. As support
    for our conclusion that the temporary suspension fell within the Bureau’s implied
    authority, we recognized the general rule that agencies possess implied authority
    “to reconsider and rectify errors even though the applicable statute and regulations
    29
    do not expressly provide for such reconsideration.” Id. Thus, Gun South
    recognized the Bureau’s implied authority to impose a temporary suspension
    where the Gun Control Act lacked an express provision authorizing such action.
    Id.15
    In contrast to the Bureau in Gun South, here, the EPA had statutory tools
    available to revise the SIP: Sections 110(k)(5) and (k)(6) of the Clean Air Act.
    The EPA chose to invoke Section 110(k)(6) of the Clean Air Act to “revise” a SIP
    revision approved “in error,” 47 U.S.C. § 7410(k)(6), but failed to articulate what
    error was committed in the 2008 approval. We decline to imply any authority to
    act beyond the confines of the EPA’s statutory authority where the Clean Air Act
    provides express provisions for revising and correcting a SIP. See, e.g., Mich. v.
    EPA, 
    268 F.3d 1075
    , 1081 (D.C. Cir. 2001) (noting the EPA is “a creature of
    statute,” and may exercise “only those authorities conferred upon it by Congress”).
    We note that our conclusion is consistent with New Jersey, 517 F.3d at 582,
    where the D.C. Circuit recognized that “[a]n agency can normally change its
    position and reverse a decision.” The D.C. Circuit noted an important
    15
    As support for our finding of implied authority, we also relied on the legislative history
    in the Gun Control Act illustrating “Congress’s intent absolutely to bar the importation of
    firearms outside of the narrow statutory exceptions.” Gun S., 877 F.2d at 862. Additionally, we
    noted the Bureau did not interpret the Gun Control Act as prohibiting a temporary ban, and
    deferred to the Bureau’s interpretation because the plain language of the statute did not compel a
    different interpretation. Id. at 863.
    30
    qualification on that general principle: “Congress, however, undoubtedly can
    limit an agency’s discretion to reverse itself.” Id. at 583. In New Jersey, the court
    held Congress did just that by including express delisting requirements in the
    Clean Air Act. Id. The D.C. Circuit concluded those express provisions
    precluded the EPA from claiming it possessed inherent authority to delist a
    regulated unit without following the statutory procedure. See id. (noting that
    “when Congress has provided a mechanism capable of rectifying mistaken actions
    . . . it is not reasonable to infer authority to reconsider agency action” (internal
    quotation marks omitted)). Likewise, the Clean Air Act’s express statutory
    provisions for revising and correcting a SIP preclude the EPA’s reliance on any
    claim of inherent authority here.
    3. Whether the 2011 Disapproval was Court-Authorized
    As a final source of authority, the EPA places great weight on this Court’s
    September 28, 2009, order granting its motion for voluntary remand. The EPA
    relies on the “memoranda filed by the parties” to define “[t]he scope of
    authorization [the] EPA received from the Court,” and contends “[c]ontext and
    logic underscore that [the] EPA obtained authorization from this Court to proceed
    as it did on remand.” We disagree with this bold assertion.
    31
    On April 9, 2009, the EPA moved this Court for a voluntary remand. Our
    September 28, 2009, order granting the motion provided as follows:
    The EPA has filed a “Motion for Voluntary Remand” in Appeal No.
    08-16961, which is a petition for review of the final rule approving
    revisions to the Alabama State Implementation Plan. The “Motion
    for Voluntary Remand,” construed as a motion for limited remand to
    permit the EPA to conduct reconsideration proceedings and to stay
    this Court’s proceedings pending resolution of reconsideration, is
    GRANTED. Appeal Number 08-16961 is hereby REMANDED to
    the EPA on a limited basis for purposes of reconsidering the final rule
    under review, and proceedings in this Court shall remain STAYED
    pending completion of such reconsideration. The EPA is directed to
    provide the Court with reports every sixty (60) days regarding the
    status of the reconsideration proceedings.
    September 28, 2009, Order Granting Motion for Voluntary Remand at 2–3.
    Nothing in the order explicitly authorized the EPA to act outside the statutory
    procedures set forth in the Clean Air Act. The order simply permitted the EPA to
    conduct reconsideration proceedings on remand, and stayed the appeal pending
    completion of such reconsideration.
    We decline the EPA’s invitation to imply rulings on substantive issues from
    this seemingly straightforward remand order. Even assuming we could divine
    “court authorization” for the 2011 disapproval from this order, the order has no
    precedential value. Our rules state that “[a] ruling on a motion or other
    interlocutory matter, whether entered by a single judge or a panel, is not binding
    32
    upon the panel to which the appeal is assigned on the merits, and the merits panel
    may alter, amend, or vacate it.” 11th Cir. R. 27-1(g). Accordingly, we reject the
    EPA’s “court authorization” argument as meritless.
    4. The 2011 Disapproval is Vacated
    In sum, because the 2011 disapproval was not conducted according to the
    statutory procedures set forth in the Clean Air Act, we must set it aside. See 5
    U.S.C. § 706(2)(C),(D) (stating a final agency action must be set aside if it
    exceeds the agency’s statutory authority or is “without observance of procedure
    required by law”). We therefore grant Alabama Power’s petition challenging the
    2011 disapproval and vacate the EPA’s final disapproval of revisions to
    Alabama’s visible emissions rule. Because the April 6, 2011, final rule is vacated,
    the October 15, 2008, final rule approving the revisions stands as the last final
    action taken on the proposed revision. Thus, we must next consider Citizens’
    petition challenging the October 15, 2008, final rule.
    B.    The EPA’s 2008 Approval of Alabama’s SIP Revision
    Citizens contend the 2008 approval violates Section 110(l) of the Clean Air
    Act. Citizens make no specific argument as to how the EPA’s 2008 approval
    violated Section 110(l) of the Clean Air Act; rather, they rely on their arguments
    as to how the EPA’s 2011 disapproval did not violate the Clean Air Act. Citizens
    33
    also challenge two long-standing provisions of Alabama’s SIP that were not a part
    of Alabama’s 2008 submissions.16 The EPA does not defend the 2008 approval,
    but Alabama Power, as an intervenor in the 2008 appeal, claims the 2008 approval
    was valid and lawful.
    1.      Whether the 2008 Approval Violates Section 110(l) of the Clean Air
    Act
    Section 110(l) of the Clean Air Act, entitled “Plan revisions,” provides in
    pertinent part that “[t]he Administrator shall not approve a revision of a plan if the
    revision would interfere with any applicable requirement concerning attainment
    and reasonable further progress . . . or any other applicable requirement of this
    Act.” 42 U.S.C. § 7410(l). The question of whether the 2008 approval violates
    the Clean Air Act depends on the meaning of the phrase “would interfere.” The
    Sixth Circuit has concluded that “[a] court searching for the meaning of ‘interfere’
    [in Section 110(l)] or for a clearly preferred mechanism for determining that which
    interferes wades into ambiguity, the only solution to which is the deferential
    Chevron step two.” Ky. Res. Council, 467 F.3d at 995. We agree, as the Clean Air
    Act “does not directly speak to how a determination of interference is to be made.”
    16
    Citizens also make a vague and general assertion that the proposed revision leaves
    Alabama incapable of detecting particulate matter violations. Citizens have failed to offer any
    support for this claim, and there is no indication that the SIP revision renders Alabama incapable
    of detecting violations and enforcing the visible emissions limits.
    34
    Id. (internal quotation marks omitted). Thus, under Chevron step two, we defer to
    the EPA’s interpretation of Section 110(l) if it is based on a permissible
    construction of the statute. Chevron, 467 U.S. at 842–43.
    In the 2008 approval, the EPA interpreted Section 110(l) to permit approval
    of the SIP revision “‘unless the agency finds it will make air quality worse.’” 73
    Fed. Reg. at 60,960 (quoting Ky. Res. Council, 467 F.3d at 995). The EPA then
    concluded the proposed SIP revision satisfied Section 110(l)’s requirements
    because the revision would not interfere with either the annual or 24-hour
    particulate matter NAAQS. 73 Fed. Reg. at 60,959.
    The EPA’s interpretation is a permissible reading of Section 110(1), and thus
    entitled to deference. The Sixth Circuit reached this same conclusion in Kentucky
    Resources Council, 467 F.3d at 996, and we find its reasoning persuasive. As the
    Sixth Circuit noted, the EPA’s interpretation gives the states flexibility and “does
    service to a fundamental premise underlying the Clean Air Act scheme, which is
    that the states have the primary responsibility for ensuring that the NAAQS are
    met.” Id.
    We agree that where interference is not demonstrated, approval of the state’s
    SIP revision appropriately respects the state’s choice to achieve air quality
    standards with “whatever mix of emission limitations it deems best suited to its
    35
    particular situation.” Train, 421 U.S. at 79, 95 S. Ct. at 1482; see also Fla. Power
    & Light Co., 650 F.2d at 581 (“The state is ‘at liberty’ to devise the particular
    components of its pollution control plan so long as the plan is adequate to meet the
    standards mandated by [the] EPA.”). Because we find the EPA’s interpretation
    reasonable and entitled to deference, the EPA’s 2008 approval utilizing that
    interpretation does not violate Section 110(1) of the Clean Air Act.
    Although we conclude the EPA’s interpretation of Section 110(1) in the
    2008 approval was permissible, we pass no judgment on the EPA’s interpretation
    of Section 110(1) in the 2011 disapproval. There may be more than one
    permissible interpretation of a statute, see Chevron, 467 U.S. at 843 n.11, 104 S.
    Ct. at 2782 n.11, and so long as the interpretation is permissible, it does not matter
    whether the interpretation “is a dramatic shift in EPA policy,” Friends of
    Everglades v. S. Fla. Water Mgmt. Dist., 
    570 F.3d 1210
    , 1219 (11th Cir. 2009).
    2.     Whether the Automatic Exemption and Director’s Discretion
    Provisions Violate the Clean Air Act
    Citizens contend the rule providing automatic exemptions for “startup,
    shutdown, load change, and rate change or other short, intermittent periods of
    time,” see Ala. Admin. Code r. 335-3-4-.01(1)(c), may not be approved as part of
    Alabama’s SIP because such a rule would prevent the limitations of emissions on a
    36
    continuous basis. Citizens also claim the SIP’s “director’s discretion” provisions,
    see Ala. Admin. Code r. 335-3-4-.01(1)(d), are prohibited by the Clean Air Act
    because such provisions give the state the power to change rules unilaterally.
    Citizens’ attempt to challenge the EPA’s approval of the automatic
    exemption and director’s discretion provisions is untimely. Section 7607(b)(1)
    requires that “[a]ny petition for review under this subsection shall be filed within
    sixty days from the date notice of such promulgation, approval, or action appears in
    the Federal Register.” 42 U.S.C. § 7607(b)(1). The automatic exemption for
    “startup, shutdown, load change, and rate change or other short, intermittent
    periods of time,” Ala. Admin. Code r. 335-3-4-.01(1)(c), became an approved part
    of Alabama’s SIP in 1972. See Approval and Promulgation of Implementation
    Plans, 37 Fed. Reg 10,842, 10,847–48 (May 31, 1972). The “director’s discretion”
    provision, Ala. Admin. Code r. 335-3-4-.01(1)(d), became an approved part of
    Alabama’s SIP in 1993. See Alabama: Approval of the Visible Emission
    Regulations, 58 Fed. Reg. 25,566 (April 27, 1993). Accordingly, Citizens’ attempt
    to challenge these provisions now is untimely. 42 U.S.C. § 7606(b)(1).
    Moreover, we reject Citizens’ contention that the EPA reopened these
    provisions for review by considering the 2008 SIP revision. The EPA made clear
    from the outset that “[t]he director’s discretion provisions under Alabama rule 335-
    37
    3-4.01(1)(c) and (d) would be unchanged by [the 2008] SIP revision,” and that the
    provisions were “not being revised by ADEM or reviewed by [the] EPA at
    present.” 73 Fed. Reg. at 60,958 n.1. The EPA also stated that “nothing in [the
    Federal Register] notice should be considered as approving those provisions.” Id.
    There is no support for the Citizens’ contention that the EPA reopened these issues.
    We also reject Citizens’ claim that the EPA “constructively” reopened the
    provisions by considering the 2008 SIP revision. Citizens rely on Sierra Club v.
    EPA, 
    551 F.3d 1019
     (D.C. Cir. 2008), in which the D.C. Circuit stated a
    “constructive reopening occurs if the revision of accompanying regulations
    ‘significantly alters the stakes of judicial review.’” Id. at 1025 (quoting Kennecott
    Utah Copper Corp. v. U.S. Dep’t of Interior, 
    88 F.3d 1191
    , 1227 (D.C. Cir. 1996)).
    The D.C. Circuit concluded the EPA had constructively reopened a startups,
    shutdowns, and malfunctions (SSM) exemption by “completely chang[ing] the
    regulatory context for its SSM exemption by stripping out virtually all of the SSM
    plan requirements that it created to contain the exemption.” Id. (internal quotation
    marks omitted) (emphasis omitted).
    Prior to the rulemakings at issue in Sierra Club, the EPA had limited the
    SSM exemption by (1) requiring sources to comply with an SSM plan during
    periods of SSM, (2) requiring review and approval of the SSM plan, (3) requiring
    38
    that the SSM plans be made available to the public, such that the public could
    participate in the permit approval process, and (4) making the SSM plan directly
    enforceable. Id. at 1025. In the rulemakings challenged by Sierra Club, however,
    the EPA—while not officially reopening the SSM exemption—eliminated all of the
    aforementioned safeguards, meaning the SSM plans were no longer mandatory,
    enforceable, subject to approval, or publicly available. Id. at 1025–26.
    We are not presented with an analogous situation. Citizens have not pointed
    to any changes, minor or major, to the automatic exemption for “startup, shutdown,
    load change, and rate change or other short, intermittent periods of time,” or to the
    “director’s discretion” provisions. Citizens have also failed to demonstrate that the
    EPA has created a new regulatory context sufficient to constructively reopen the
    provisions—there is simply no evidence the provisions, or the enforcement of the
    provisions have changed in any way. Because the EPA did not reopen these
    provisions, constructively or otherwise, we decline to review them on appeal.
    Accordingly, we deny Citizens’ petition challenging the 2008 approval and
    affirm the EPA’s final rule approving revisions to Alabama’s visible emissions
    rule. 73 Fed. Reg. at 60,957. As a final matter, we decline to follow Citizens’ and
    the EPA’s suggestion that we ignore the 2008 approval. If the EPA wishes to
    39
    revise or correct the 2008 approval, it may do so by following the statutory
    procedures provided in the Clean Air Act. See 42 U.S.C. §§ 7410(k)(5), (k)(6).
    V. Conclusion
    Alabama Power’s petition is hereby GRANTED, and the EPA’s 2011
    disapproval is VACATED.17 Citizens’ petition is hereby DENIED, and the EPA’s
    2008 approval is AFFIRMED.
    17
    On June 21, 2011, Alabama Power filed a motion to direct the EPA to supplement the
    administrative record. The motion is denied.
    40
    MOLLOY, District Judge, concurring in part and dissenting in part:
    I agree with much of the Court’s opinion, including its determination that the
    EPA was not required to issue a SIP call as the exclusive means of revising the SIP
    approved in 2008. To that extent, I concur in the majority opinion. But I respectfully
    dissent from the Court’s determination that “[n]either the text of the final rule
    disapproving revision published in the Federal Register, nor the record before this
    Court, reveal that EPA affirmatively made the requisite error determination.” Majority
    Op. at 23.
    My disagreement is based on two specific differences with the Court’s opinion.
    First, the EPA’s notices and decisions in the Federal Register quite clearly describe
    how the agency believes it was in error in approving the 2008 proposed revision.
    Second, the process that the EPA followed was more accommodating to the State and
    to the affected industries than what will inevitably follow from Court’s decision, as
    applied in future cases. I believe we should dismiss the 2008 action for lack of
    jurisdiction and affirm the EPA’s 2011 disapproval.
    I.
    When the EPA published notice that it was proposing either to affirm its
    approval or disapprove Alabama’s proposed revision, it said:
    41
    EPA’s prior approval notice provides extensive discussion of the reasons
    why EPA concluded in that notice that section 110(l) had been satisfied.
    In particular, EPA stated as grounds for this conclusion that: “(1) The
    revision would not increase the allowable average opacity levels; and (2)
    the relationship between changes in opacity and increases or decreases
    in ambient PM2.5 levels cannot be quantified readily for the sources
    subject to this SIP revision, and is particularly uncertain for short-term
    analyses.”
    74 Fed. Reg. 50930, 50932–33 (Oct. 2, 2009) (quoting 73 Fed. Reg. at 60959 (Oct. 15,
    2008)) (internal citations and footnote omitted).
    Given those two reasons for approving the 2008 proposed revision, the error
    that the EPA believes it committed is identified in the thorough description set forth
    in the Federal Register:
    Based on the information received to date, EPA believes that increases
    or decreases in PM2.5 emissions based on short-term increases in opacity
    cannot be quantified readily for the sources subject to this SIP revision.
    There are several contributors to the uncertainties associated with
    relating mass emissions to increases in opacity, including: (1)
    Differences between combustion technology characteristics and fuel
    components, (2) differences in control technology types, temperatures at
    which they operate, and load characteristics, (3) the recognition that both
    opacity and mass emissions are subject to significant variability over
    short periods of time and fluctuations such that one may act
    independently of the other, and (4) differences between the mass of
    particles that exists at the point of opacity measurement by the COMS
    (e.g., in the stack) and the direct PM2.5 that forms immediately upon
    exiting the stack (that are related to fuel components more than to control
    technology).
    42
    Id. at 50933. In this passage, the agency makes clear that because “the relationship
    between changes in opacity and increases or decreases in ambient PM 2.5 levels cannot
    be quantified readily for the sources subject to this SIP revision” and because there are
    at least four distinct reasons that little or no change in opacity might yet be
    accompanied by a significant increase in actual emission of particulate matter, the
    EPA cannot say whether the proposed revision “would interfere with any applicable
    requirement concerning attainment.” Because § 110(l) of the Clean Air Act requires
    the EPA to ensure that the proposed revision will not interfere with any applicable
    requirement concerning attainment, the EPA’s approval did not comply with the Act.
    That is the identified error or mistake the agency made.
    The EPA also described a second error, an extension of the first, when it
    announced its disapproval of the 2008 proposed revision. It said that in its prior
    approval of the revision:
    [W]e established a new metric of “average daily opacity” (and “average
    quarterly opacity”) and concluded that section 110(l) did not prohibit
    approval of a SIP revision that allowed significantly increased opacity
    levels for longer consecutive periods of time because the revision would
    not increase the allowable average opacity levels (on either a quarterly
    or daily basis). This analysis was focused on opacity and operational
    conditions regarding opacity as opposed to a focus on the relationship
    between opacity and PM mass emissions . . . .
    43
    76 Fed. Reg. 18870, 18874 (Apr. 6, 2011) (emphases added). In short, the prior
    analysis looked at numbers, not at what the numbers were supposed to index or
    signify. The mistaken prior analysis was inconsistent with the requirements of the
    Act.
    When it announced its final decision to disapprove the proposed revision, the
    EPA referred back to the two identified reasons in support of approval that were stated
    in its Notice of October 2, 2009. It said:
    [B]oth of the findings that provided the foundation for [EPA’s] initial
    approval of the SIP revision were not strong enough to support approval
    under the [Clean Air Act]. EPA concludes that, as it was described in the
    Submittals, the concept of “average daily opacity” is not a useful tool for
    evaluating whether the Submittals are likely to maintain current air
    quality, particularly given the lack of other limitations on opacity
    exceedances in the Submittals. . . .
    76 Fed. Reg. 18870, 18874–75 (Apr. 6, 2011) (emphases added).
    All of these statements describe errors of judgment. The EPA does not use the
    specific words “error” or “correction.” Nor does it identify a mathematical mistake or
    linguistic slip. And it does not provide an easy descriptor of the error or expressly
    invoke § 110(k)(6). But, just as the majority does not require the EPA to intone
    “magic words,” Majority Op. at 28, there is no reason why such omissions should
    doom the agency’s action.
    44
    The majority states, “Congress has required the EPA to articulate an ‘error’ and
    provide ‘the basis’ of its determination that an error occurred.” Id. at 23 (emphasis
    added). But that is not exactly what the Act says. The Act says the EPA may revise
    its prior approval, disapproval, or promulgation whenever it determines that its action
    “was in error.” Section 110(k)(6) (emphasis added). When error is spoken of as a
    place, the intent is often to include misjudgment rather than mere mistake or omission.
    Because the EPA described the errors of judgment that it sought to correct,
    §110(k)(6) authorized its reconsideration of its approval of Alabama’s proposed SIP
    revision. That being so, the agency had not “completed its decisionmaking process”
    as to the 2008 approval, Franklin v. Massachusetts, 
    505 U.S. 788
    , 797 (1992), and the
    erstwhile approval became “interlocutory in nature,” National Parks Conservation
    Ass’n v. Norton, 
    324 F.3d 1229
    , 1236–37 (quoting Bennett v. Spear, 
    520 U.S. 154
    ,
    177-78 (1997)). See also Whitman v. Am. Trucking Ass’ns, Inc., 
    531 U.S. 457
    , 479
    (2001). Therefore, I would dismiss the 2008 action for lack of jurisdiction.
    II.
    I would also uphold the EPA’s action in 2011 disapproving the proposed
    revision. The proposal, after all, would apply not only to the coal-fired utilities
    represented in this action but also to cement manufacturing facilities, as well as pulp
    and paper facilities, entities which might generate different kinds of particulate matter
    45
    in different ways with different consequences. See 76 Fed. Reg. 18873 & n.8; 74 Fed.
    Reg. at 50933. The EPA found that, while “[o]ne of the primary purposes of opacity
    limits is to ensure that PM control devices are operating within normal parameters,”
    the proposed revision might result in failure to alert an operator or the State or EPA
    to an equipment malfunction that is not only causing increased opacity but failing to
    control types of PM emissions that the operator mistakenly believes to be under
    control. 76 Fed. Reg. at 18874. “[A] rule that allows no more than one 6-minute
    exceedance per hour and opacity readings no greater than 40 percent clearly requires
    more effective control equipment and/or operating procedures than . . . a rule that
    allows longer consecutive periods of exempt opacity excursions and at higher opacity
    levels.” Id. at 18876.
    Further, the EPA found:
    [E]lements that are missing from the submitted modeling include: data
    from all the sources and source categories affected by the Alabama
    Submittals[1] ; a demonstration of the relationship between PM emissions
    and opacity at a particular facility and source-category; consideration of
    emissions from other sources in the modeled area; condensable PM data;
    explanation for background PM levels used in the evaluation; and an
    explanation of the use of PM 10 as a surrogate for PM 2.5; among other
    concerns.
    1
    For instance, while Alabama Power Company submitted models, cement manufacturers
    and pulp and paper facilities, whose operations would also be affected by the proposed revision,
    apparently did not. 74 Fed. Reg. at 50933; 76 Fed. Reg. at 18873.
    46
    Id. at 18875. The EPA concluded that “it is reasonably foreseeable that approving the
    Alabama Submittals would allow increased mass emissions, for at least some sources
    and under at least some conditions, over the PM emission levels that would have been
    allowed” under the previous rule.         Consequently, “[S]ection 110(l) requires
    disapproval . . . absent additional limitations which would significantly diminish the
    likelihood that mass emissions increases will occur.” Id. at 18876.
    In its 2011 disapproval, in my view, the EPA permissibly construed § 110(l) and
    acted neither arbitrarily nor capriciously when it determined that an increase in opacity
    limits will “interfere” with the PM2.5 standard for attainment by making it more
    difficult for operators to spot malfunctions and by exempting more emissions of
    particulate matter. Although opacity is not attainment and is not an air-quality
    standard, it is aptly described as an “applicable requirement concerning attainment.”
    These determinations are squarely within the heartland of EPA expertise and the
    sphere of judicial deference to it under Chevron. That being so, the law requires us
    to defer to the agency determination in this case where the meaning of words or
    phrases in a statute or regulation is evident from context. See Nat’l Ass’n of Home
    Builders vs Defenders of Wildlife, 
    551 U.S. 644
    , 666 (2007).
    Of greater concern is what I perceive will be the consequence of the majority’s
    reasoning. The EPA’s Notice of October 2, 2009, solicited input on whether its 2008
    47
    approval was, in fact, “in error.” I believe that the EPA complied with § 110(k)(6) in
    making this request for input because the statute requires it to undertake any revision
    of its prior action “in the same manner as the approval” but “without requiring any
    further submission from the State.” When it gave notice of its intent to reconsider, the
    EPA said:
    This rulemaking is part of EPA’s reconsideration process on our October
    15, 2008, final action approving Alabama’s visible emissions SIP
    revisions. EPA is seeking public comment on proposals to affirm our
    prior action, which approved the SIP revisions, or amend and disapprove
    the revisions to Alabama SIP rule 335-3-4-.01 (“Visible Emissions”),
    submitted initially in 2003 and significantly revised and re-submitted on
    August 22, 2008.
    74 Fed. Reg. at 50934.
    The EPA could have simply decreed in 2009 that it made an error of judgment
    in approving Alabama’s proposed revision because the evidence was not sufficient to
    ensure that allowing opacity greater than 20% for more extended periods of time
    would not result in emission of more particulate matter. Had it done so, under the
    majorities’ reasoning we could not now conclude that the EPA’s reconsideration was
    faulty. It is not particularly unusual for a change in philosophy within an agency to
    result in a policy about-face or to perceive error in earlier decisions. See, e.g., FCC
    v. Fox Television Stations, Inc., 
    556 U.S. 502
    , 514–15 (2009); Nat’l Ass’n of Home
    Builders v. EPA, 
    682 F.3d 1032
    , 1034–39 (D.C. Cir. 2012); Chamber of Commerce
    48
    v. EPA, 
    642 F.3d 192
    , 196–66 (D.C. Cir. 2011); see also Sierra Club v. Ga. Power
    Co., 
    443 F.3d 1346
    , 1353–54 & n.11 (11th Cir. 2006) (describing the EPA’s
    clarification in 2001 of guidance that it provided in 1999). What one person calls “a
    reevaluation of which policy would be better in light of the facts,” Home Builders, 682
    F.3d at 1038, another person may reasonably call a determination that prior policy was
    “in error,” § 110(k)(6).
    But, here, instead of taking wholly on itself the determination that an error
    occurred, EPA invited the interested parties to provide input on the question of
    whether it erred. It specifically asked for plant- or industry-specific data about the
    relationship between opacity and real amounts of particulate emissions into the
    ambient air. As a result of the EPA’s willingness to listen to these responses and
    consider additional data from interested parties before it made a final decision whether
    to change course, the majority concludes that the EPA exceeded its authority. If this
    reasoning is correct, and I do not think it is, the lesson for the EPA is—declare errors
    first, and investigate whether they exist later. It has a “verdict first, evidence later”
    feel to it.
    No one affected by EPA’s decision in this case claims they were unable to
    understand why the agency was concerned about its prior action. On the contrary,
    both the State and the utility industries avoid making any such claim, asserting instead
    49
    that EPA failed to identify a “technical or clerical error”—words that cannot be found
    in § 110(k)(6)’s phrase “in error.” No one has even attempted to refute the EPA’s
    concern about the relationship between opacity and particulate matter or that
    consideration of the relationship is an issue wholly within the mainstream of the
    agency’s responsibilities.
    In my view, the process functioned just as it is supposed to. The EPA did not
    hide the ball, it did not do anything that was irrational, arbitrary, or capricious, it gave
    ample opportunity to interested groups to explain their own positions and allay the
    EPA’s concerns, and, at least in my opinion, it clearly explained its own concerns and
    final decision. I believe the record fails to support the appellant’s position and, under
    applicable law, supports the EPA’s actions and decision.
    The majority’s conclusion that the EPA “failed to articulate an error” reflects
    a determination of what the majority expects the articulation of error to sound like and
    less to do with the EPA’s process or its findings about air quality and particulate
    matter.
    When the question is whether the EPA had authority to reconsider under
    § 110(k)(6), we should read what the agency said in the Federal Register in the
    particular case at hand and ask whether the agency says that it was wrong on a prior
    occasion. Doing so remains the best way to avoid asking for “magic words” and is
    50
    the best way to determine whether the agency’s actions—regardless of its brief or oral
    argument, see Majority Op. at 25–26 & n.11—were consistent with the law enacted
    by Congress.
    For these reasons, I respectfully dissent.
    51