White Stallion Energy Center, LLC v. Environmental Protection Agency , 748 F.3d 1222 ( 2014 )


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  •  United States Court of Appeals
    FOR THE DISTRICT OF COLUMBIA CIRCUIT
    Argued December 10, 2013             Decided April 15, 2014
    No. 12-1100
    WHITE STALLION ENERGY CENTER, LLC,
    PETITIONER
    v.
    ENVIRONMENTAL PROTECTION AGENCY,
    RESPONDENT
    AMERICAN ACADEMY OF PEDIATRICS, ET AL.,
    INTERVENORS
    Consolidated with 12-1101, 12-1102, 12-1147, 12-1172,
    12-1173, 12-1174, 12-1175, 12-1176, 12-1177, 12-1178,
    12-1180, 12-1181, 12-1182, 12-1183, 12-1184, 12-1185,
    12-1186, 12-1187, 12-1188, 12-1189, 12-1190, 12-1191,
    12-1192, 12-1193, 12-1194, 12-1195, 12-1196
    On Petitions for Review of Final Rule of the
    United States Environmental Protection Agency
    Lee B. Zeugin and Neil D. Gordon, Assistant Attorney
    General, Office of the Attorney General for the State of
    Michigan, argued the causes for State, Industry, and Labor
    Petitioners. With them on the joint briefs were F. William
    Brownell, Lauren E. Freeman, Elizabeth L. Horner, Bill
    2
    Schuette, Attorney General, Office of the Attorney General for
    the State of Michigan, John J. Bursch, Solicitor General, S.
    Peter Manning, Assistant Attorney General, Luther Strange,
    Attorney General, Office of the Attorney General for the State
    of Alabama, Michael C. Geraghty, Attorney General, Office of
    the Attorney General for the State of Alaska, Steven E. Mulder,
    Attorney, Peter S. Glaser, George Y. Sugiyama, Michael H.
    Higgins, David B. Rifkin, Jr., Lee A. Casey, Mark W. DeLaquil,
    Andrew M. Grossman, David Flannery, Gale Lea Rubrecht,
    Kathy G. Beckett, Edward L. Kropp, Leslie Sue Ritts, Thomas
    Horne, Attorney General, Office of the Attorney General for the
    State of Arizona, Joseph P. Mikitish and James T. Skardon,
    Assistant Attorneys General, Dustin McDaniel, Attorney
    General, Office of the Attorney General for the State of
    Arkansas, Kendra Akin Jones, Assistant Attorney General,
    Charles L. Moulton, Senior Assistant Attorney General, Pamela
    Jo Bondi, Attorney General, Office of the Attorney General for
    the State of Florida, Jonathan A. Glogau, Attorney, Lawrence G.
    Wasden, Attorney General, Office of the Attorney General for
    the State of Idaho, Grant Crandall, Arthur Traynor, III, Eugene
    M. Trisko, Gregory F. Zoeller, Attorney General, Office of the
    Attorney General for the State of Indiana, Valerie Tachtiris,
    Deputy Attorney General, Dennis Lane, Derek Schmidt,
    Attorney General, Office of the Attorney General for the State
    of Kansas, Jeffrey A. Chanay, Deputy Attorney General, Henry
    V. Nickel, George P. Sibley III, Eric A. Groten, Jeremy C.
    Marwell, John A. Riley, Christopher C. Thiele, Harold E.
    Pizzetta III, Assistant Attorney General, Office of the Attorney
    General for the State of Mississippi, Chris Koster, Attorney
    General, Office of the Attorney General for the State of
    Missouri, James R. Layton and John J. McManus, Attorneys,
    Paul D. Clement, Nathan A. Sales, Lisa Marie Jaeger, Jon
    Bruning, Attorney General, Office of the Attorney General for
    the State of Nebraska, Katherine J. Spohn, Special Counsel to
    the Attorney General, Wayne Stenehjem, Attorney General,
    3
    Office of the Attorney General for the State of North Dakota,
    Margaret I. Olson, Steven C. Kohl, Eugene E. Smary, Sarah C.
    Lindsey, E. Scott Pruitt, Attorney General, Office of the
    Attorney General for the State of Oklahoma, P. Clayton
    Eubanks, Assistant Attorney General, Michael DeWine,
    Attorney General, Office of the Attorney General for the State
    of Ohio, Dale T. Vitale and Gregg H. Bachmann, Assistant
    Attorneys General, Robert M. Wolff, Special Counsel, Alan
    Wilson, Attorney General, Office of the Attorney General for the
    State of South Carolina, James Emory Smith, Jr., Assistant
    Deputy Attorney General, Mark L. Shurtleff, Attorney General,
    Office of the Attorney General for the State of Utah, Greg
    Abbott, Attorney General, Office of the Attorney General for the
    State of Texas, Jon Niermann, Chief, Mark Walters and Mary E.
    Smith, Assistant Attorneys General, Kenneth T. Cuccinelli, II,
    Attorney General, Office of the Attorney General for the
    Commonwealth of Virginia, Patrick Morrisey, Attorney
    General, Office of the Attorney General for the State of West
    Virginia, Silas B. Taylor, Senior Deputy Attorney General,
    Jeffrey R. Holmstead, Sandra Y. Snyder, Gregory A. Phillips,
    Attorney General, Office of the Attorney General for the State
    of Wyoming, Jay A. Jerde, Deputy Attorney General, Jack
    Conway, Attorney General, Office of the Attorney General for
    the State of Kentucky, Bart E. Cassidy, and Katherine L.
    Vaccaro.
    Bill Cobb argued the cause for Industry Petitioners’ Specific
    Issues. With him on the briefs were Michael Nasi, Leslie Sue
    Ritts, Jeffrey R. Holmstead, Sandra Y. Snyder, Paul D. Clement,
    Nathan A. Sales, Steven C. Kohl, Eugene E. Smary, Sarah C.
    Lindsay, Bart E. Cassidy, Katherine L. Vaccaro, John C. Hayes,
    Jr., Dennis Lane, John A. Riley, Christopher C. Thiele, C. Grady
    Moore, III, P. Stephen Gidiere, III, and Thomas Lee Casey, III.
    Sanjay Narayan and Eric Schaeffer argued the causes for
    4
    Environmental Petitioners. With them on the briefs were
    Whitney Farrell, James S. Pew, Neil Gormley, Ann Brewster
    Weeks, and Darin Schroeder.
    David Bookbinder argued the cause and filed the briefs for
    petitioner Julander Energy Company.
    Michael B. Wigmore, Sandra P. Franco, Robin S. Conrad,
    Rachel Brand, and Sheldon Gilbert were on the brief for amicus
    curiae The Chamber of Commerce of the United States of
    America in support of Industry Petitioners.
    Eric G. Hostetler, Matthew R. Oakes, and Amanda S.
    Berman, Attorneys, U.S. Department of Justice, argued the
    causes for respondent. With them on the brief was Wendy L.
    Blake, Attorney, U.S. Environmental Protection Agency.
    Melissa Hoffer, Assistant Attorney General, Office of the
    Attorney General for the Commonwealth of Massachusetts,
    argued the cause for State and Local Government Intervenors in
    support of Respondent. With her on the brief were Martha
    Coakley, Attorney General, Office of the Attorney General for
    the State of Massachusetts, Tracy Triplett and Carol A. Iancu,
    Assistant Attorneys General, Kamala D. Harris, Attorney
    General, Office of the Attorney General for the State of
    California, Janill L. Richards, Supervising Deputy Attorney
    General, Susan L. Durbin, Deputy Attorney General, Joseph R.
    Biden, III, Attorney General, Office of the Attorney General for
    the State of Delaware, Valerie M. Satterfield, Deputy Attorney
    General, Thomas L. Miller, Attorney General, Office of the
    Attorney General for the State of Iowa, David R. Sheridan,
    Assistant Attorney General, George Jepsen, Attorney General,
    Office of the Attorney General for the State of Connecticut,
    Kimberly P. Massicotte and Matthew I. Levine, Assistant
    Attorneys General, Lisa Madigan, Attorney General, Office of
    5
    the Attorney General for the State of Illinois, Matthew J. Dunn
    and Gerald T. Karr, Assistant Attorneys General, Douglas F.
    Gansler, Attorney General, Office of the Attorney General for
    the State of Maryland, Roberta R. James, Assistant Attorney
    General, Michael A. Delaney, Attorney General, Office of the
    Attorney General for the State of New Hampshire, K. Allen
    Brooks, Senior Assistant Attorney General, Janet T. Mills,
    Attorney General, Office of the Attorney General for the State
    of Maine, Gerald D. Reid, Assistant Attorney General, Lori
    Swanson, Attorney General, Office of the Attorney General for
    the State of Minnesota, Max Kieley, Assistant Attorney General,
    Eric T. Schneiderman, Attorney General, Office of the Attorney
    General for the State of New York, Michael J. Myers and Kevin
    P. Donovan, Assistant Attorneys General, Ellen F. Rosenbaum,
    Attorney General, Office of the Attorney General for the State
    of Oregon, Paul A. Garrahan, Assistant Attorney-in-Charge,
    Gary K. King, Attorney General, Office of the Attorney General
    for the State of New Mexico, Stephen R. Farris, Assistant
    Attorney General, Roy Cooper, Attorney General, Office of the
    Attorney General for the State of North Carolina, James C.
    Gulick, Senior Deputy Attorney General, J. Allen Jernigan,
    Marc Bernstein, and Amy L. Bircher, Special Deputy Attorneys
    General, William H. Sorrell, Attorney General, Office of the
    Attorney General for the State of Vermont, Thea J. Schwartz,
    Assistant Attorney General, George A. Nilson, William R.
    Phelan, Jr., Peter F. Kilmartin, Attorney General, Office of the
    Attorney General for the State of Rhode Island, George S.
    Schultz, Special Assistant Attorney General, Irvin B. Nathan,
    Attorney General, Office of the Attorney General for the District
    of Columbia, Amy E. McDonnell, Deputy General Counsel,
    Christopher King, Benna Ruth Solomon, and Jeremy Toth.
    Sean H. Donahue argued the cause for Public Health,
    Environmental, and Environmental Justice Group Respondent
    Intervenors. With him on the brief were Pamela A. Campos,
    6
    Tomás Carbonell, Ann Brewster Weeks, Darin T. Schroeder,
    James S. Pew, Neil E. Gormley, Sanjay Narayan, John D.
    Walke, and John Suttles. Vickie L. Patton entered an
    appearance.
    Brendan K. Collins argued the cause for Industry
    Respondent Intervenors. With him on the brief were Robert B.
    McKinstry Jr., Lorene L. Boudreau, and Erik S. Jaffe.
    Peter S. Glaser, George Y. Sugiyama, F. William Brownell,
    Lauren E. Freeman, Lee B. Zeugin, Elizabeth L. Horner, David
    B. Rivkin Jr., Lee A. Casey, Mark W. DeLaquil, Andrew M.
    Grossman, Jeremy C. Marwell, Eric A. Groton, Jeffrey R.
    Holmstead, and Sandra Y. Snyder were on the brief for Industry
    Intervenors in response to Environmental Petitioners. Henry V.
    Nickel entered an appearance.
    Peter S. Glaser, George Y. Sugiyama, Hahnah Williams, F.
    William Brownell, Lauren E. Freeman, Lee B. Zeugin, Elizabeth
    L. Horner, Jeremy C. Marwell, Eric A. Groton, Jeffrey R.
    Holmstead, Sandra Y. Snyder, Bill Cobb, Michael Nasi, David
    B. Rivkin Jr., Lee A. Casey, Mark W. DeLaquil, and Andrew M.
    Grossman were on the brief for Intervenor Respondents in
    Opposition to Brief of Petitioner Julander Energy Company.
    Wendy B. Jacobs, Adam Babich, and Michael A. Livermore
    were on the brief for amici curiae Institute for Policy Integrity,
    et al. in support of respondent.
    Before: GARLAND, Chief Judge, and ROGERS and
    KAVANAUGH, Circuit Judges.
    7
    PER CURIAM:*1 In 2012, the Environmental Protection
    Agency promulgated emission standards for a number of listed
    hazardous air pollutants emitted by coal- and oil-fired electric
    utility steam generating units. See National Emission Standards
    for Hazardous Air Pollutants From Coal- and Oil-Fired Electric
    Utility Steam Generating Units and Standards of Performance
    for Fossil-Fuel-Fired Electric Utility, Industrial-Commercial-
    Institutional, and Small Industrial-Commercial-Institutional
    Steam Generating Units, Final Rule, 77 Fed. Reg. 9304 (Feb.
    16, 2012). In this complex case, we address the challenges to
    the Final Rule by State, Industry, and Labor petitioners, by
    Industry petitioners to specific aspects of the Final Rule, by
    Environmental petitioners, and by Julander Energy Company.
    For the following reasons, we deny the petitions challenging the
    Final Rule.
    I.
    In 1970, Congress enacted § 112 of the Clean Air Act, Pub.
    L. No. 91-604, § 4(a), 84 Stat. 1676, 1685 (1970), to reduce
    hazardous air pollutants (“HAPs”). See Sierra Club v. EPA, 
    353 F.3d 976
    , 979 (D.C. Cir. 2004); H. R. REP. NO. 101-490, at 150
    (1990). The statute defined HAPs as “air pollutant[s] . . . which
    in the judgment of the Administrator [of the Environmental
    Protection Agency (“EPA”)] cause, or contribute to, air
    pollution which may reasonably be anticipated to result in an
    increase in mortality or an increase in serious irreversible, or
    incapacitating reversible, illness.” § 112(a)(1), 84 Stat. at 1685.
    In its original form, § 112 required EPA to publish a list
    containing “each hazardous air pollutant for which [it] intends
    to establish an emission standard.” § 112(b)(1)(A), 84 Stat. at
    * Parts I, II, and IV are written by Judge Rogers. Part III is
    written by Judge Kavanaugh, as are his dissenting opinion in Part
    II.B.2 and his concurring opinion in Part IV.
    8
    1685. EPA then was to promulgate, within 360 days, emission
    standards “provid[ing] an ample margin of safety to protect the
    public health” for each listed HAP, unless EPA found that a
    particular listed substance was in fact not hazardous.
    § 112(b)(1)(B), 84 Stat. at 1685. Over the next eighteen years,
    EPA listed only eight HAPs, established standards for only
    seven, and as to these seven addressed only a limited selection
    of possible pollution sources. See New Jersey v. EPA, 
    517 F.3d 574
    , 578 (D.C. Cir. 2008); S. REP. NO. 101-228, at 131 (1989).
    To remedy the slow pace of EPA’s regulation of HAPs,
    Congress amended the Clean Air Act in 1990, see Pub. L. No.
    101-549, 104 Stat. 2531 (1990) (“CAA”), by eliminating much
    of EPA’s discretion in the process. See New 
    Jersey, 517 F.3d at 578
    . In the amended § 112, Congress itself listed 189 HAPs that
    were to be regulated, see CAA § 112(b), 42 U.S.C. § 7412(b),
    and directed EPA to publish a list of “categories and
    subcategories” of “major sources” and certain “area sources”
    that emit these pollutants, CAA § 112(c), 42 U.S.C. § 7412(c).
    Once listed, a source category may only be delisted (with one
    exception not relevant here) if EPA determines that “no source”
    in that category emits HAPs in quantities exceeding specified
    thresholds. CAA § 112(c)(9)(B), 42 U.S.C. § 7412(c)(9)(B).
    For each listed “category or subcategory of major sources and
    area sources” of HAPs, EPA must promulgate emission
    standards. CAA § 112(d)(1), 42 U.S.C. § 7412(d)(1). Section
    112(d) provides, as relevant, that emission standards
    shall require the maximum degree of reduction in
    emissions of the hazardous air pollutants subject to this
    section (including a prohibition on such emissions,
    where achievable) that the Administrator, taking into
    consideration the cost of achieving such emission
    reduction, and any non-air quality health and
    environmental impacts and energy requirements,
    9
    determines is achievable[.]
    CAA § 112(d)(2), 42 U.S.C. § 7412(d)(2) (emphasis added).
    For existing sources, these “maximum achievable control
    technology” (“MACT”) standards may not be less stringent —
    regardless of cost or other considerations — “than [] the average
    emission limitation achieved by the best performing [] sources”
    in the relevant category or subcategory.                    CAA
    § 112(d)(3)(A)–(B), 42 U.S.C. § 7412(d)(3)(A)–(B); see Nat’l
    Lime Ass’n v. EPA, 
    233 F.3d 625
    , 629 (D.C. Cir. 2000). EPA
    refers to minimum-stringency MACT standards as “floors.”
    Standards more stringent than the floors, determined pursuant to
    § 112(d)(2), are called “beyond-the-floor” limits.
    For electric utility steam generating units (“EGUs”),
    however, Congress directed that prior to any listing EPA
    conduct a study of “the hazards to public health reasonably
    anticipated to occur as a result of [EGU HAP emissions] after
    imposition of the requirements of this Chapter [i.e., Chapter 85
    Air Pollution Prevention and Control].” CAA § 112(n)(1)(A),
    42 U.S.C. § 7412(n)(1)(A) (emphasis added). The results of this
    “Utility Study” were to be reported to Congress within three
    years. 
    Id. Further, Congress
    directed that:
    The Administrator shall regulate [EGUs] under this
    section, if the Administrator finds such regulation is
    appropriate and necessary after considering the results
    of the study required by this subparagraph.
    
    Id. (emphasis added).
    Congress also directed EPA to conduct
    two other studies on mercury emissions: the “Mercury Study”
    on “the rate and mass of such emissions, the health and
    environmental effects of such emissions, technologies which are
    available to control such emissions, and the costs of such
    technologies,” to be reported to Congress in four years, and the
    10
    National Institute of Environmental Health Sciences “study to
    determine the threshold level of mercury exposure below which
    adverse human health effects are not expected to occur,” to be
    reported to Congress in three years.               See CAA
    § 112(n)(1)(A)–(C), 42 U.S.C. § 7412(n)(1)(A)–(C).
    In December 2000, on the basis of the Utility Study and
    other data subsequently gathered, EPA issued a notice of
    regulatory finding “that regulation of HAP emissions from coal-
    and oil-fired electric utility steam generating units under section
    112 of the CAA is appropriate and necessary.” Regulatory
    Finding on the Emissions of Hazardous Air Pollutants From
    Electric Utility Steam Generating Units, 65 Fed. Reg. 79,825,
    79,826 (Dec. 20, 2000) (“2000 Finding”). EPA found that
    EGUs “are the largest source of mercury emissions in the U.S.”
    and that “[m]ercury is highly toxic, persistent, and
    bioaccumulates in food chains.” 65 Fed. Reg. at 79,827.
    Specifically, “[m]ercury emitted from [EGUs] . . . is transported
    through the atmosphere and eventually deposits onto land or
    water bodies” where it then changes into “a highly toxic”
    substance called methylmercury.             
    Id. Methylmercury “biomagnifies
    in the aquatic food chain,” 
    id., meaning that
    it
    becomes concentrated in the bodies of predatory fish which
    absorb the methylmercury their food sources contained. When
    humans eat these contaminated fish, they also are exposed; the
    methylmercury from the fish is absorbed into the bloodstream
    and “distributed to all tissues including the brain.” 
    Id. at 79,829.
    The risks are greatest for women of childbearing age, EPA
    explained, because methylmercury “readily passes . . . to the
    fetus and fetal brain,” 
    id., and “the
    developing fetus is most
    sensitive to the effects of methylmercury,” 
    id. at 79,827.
    Children born to women who were exposed to methylmercury
    during pregnancy have exhibited neurological abnormalities and
    developmental delays. 
    Id. at 79,829.
                                   11
    EPA concluded that “the available information indicate[d]
    that mercury emissions from [EGUs] . . . are a threat to public
    health and the environment,” notwithstanding “uncertainties
    regarding the extent of the risks due to electric utility mercury
    emissions.” 
    Id. (emphasis added).
    EPA also identified several
    other metal and acid gas emissions from EGUs that were “of
    potential concern,” namely arsenic, chromium, nickel, cadmium,
    dioxins, hydrogen chloride, and hydrogen fluoride. 
    Id. EPA therefore
    determined that it was “appropriate” to regulate coal-
    and oil-fired EGUs under § 112 because of the health and
    environmental hazards posed by mercury emissions from EGUs,
    and the availability of a number of control options to effectively
    reduce such emissions. 
    Id. at 79,830.
    EPA further determined
    that it was “necessary” to regulate EGUs under § 112 because
    implementation of other provisions of the CAA would “not
    adequately address” the public health and environmental hazards
    found. 
    Id. Therefore, EPA
    added “coal- and oil-fired electric
    utility steam generating units to the list of source categories
    under section 112(c) of the CAA.” 
    Id. In 2005,
    EPA reversed its 2000 Finding and removed coal-
    and oil-fired EGUs from the list of source categories under
    § 112(c). See Revision of December 2000 Regulatory Finding
    on the Emissions of Hazardous Air Pollutants From Electric
    Utility Steam Generating Units and the Removal of Coal- and
    Oil-Fired Electric Utility Steam Generating Units From the
    Section 112(c) List, 70 Fed. Reg. 15,994, 15,994 (Mar. 29, 2005)
    (“2005 Delisting Decision”). This change was based on EPA’s
    revised interpretation of § 112(n)(1)(A) and, to some extent, on
    a revised assessment of the results of the Utility Study. EPA
    concluded that it lacked authority under § 112(n)(1)(A) to
    regulate on the basis of non-health hazards (e.g., environmental
    harms), and should “focus solely” on the health effects directly
    attributable to EGU emissions, rather than on EGUs’
    contribution to overall pollutant levels. 
    Id. at 15,998.
    Further,
    12
    EPA decided it could consider other relevant, “situation-specific
    factors, including cost” that may affect whether regulation under
    § 112 is “appropriate.” 
    Id. at 16,000–01.
    Critically, EPA
    determined that it must make its “appropriate and necessary”
    finding by reference to health hazards that will remain “after
    imposition of the requirements of” the CAA. 
    Id. at 15,998
    (emphasis added) (quoting CAA § 112(n)(1)(A), 42 U.S.C.
    § 7412(n)(1)(A)). EPA interpreted these other “requirements”
    to include “not only those requirements already imposed and in
    effect, but also those requirements that EPA reasonably
    anticipates will be implemented” and which “could either
    directly or indirectly result in reductions of utility HAP
    emissions.” 
    Id. at 15,999.
    Concluding that regulation under
    other provisions of the CAA would adequately address EGU
    emissions of mercury and other HAPs, EPA determined that
    regulation under § 112 was neither “appropriate” nor
    “necessary.” 
    Id. at 16,002–08.
    In responding to comments,
    EPA stated that if it were to regulate EGU emissions, then it
    would regulate only those substances for which it had made a
    specific “appropriate and necessary” determination. States and
    other groups petitioned for review and this court vacated the
    2005 Listing Decision, New 
    Jersey, 517 F.3d at 583
    , holding
    that EPA’s attempt to reverse its December 2000 listing decision
    was unlawful because Congress had “unambiguously limit[ed]
    EPA’s discretion to remove sources, including EGUs, from the
    section 112(c)(1) list once they have been added to it.”
    In 2012, after notice and comment, EPA “confirm[ed]” its
    2000 Finding that regulation of EGU emissions under § 112 is
    “appropriate and necessary.” Final Rule, 77 Fed. Reg. 9304,
    9310–11. In the proposed rule, EPA stated that “the December
    2000 Finding was valid at the time it was made based on the
    information available to the Agency at that time.” Proposed
    Rule, 76 Fed. Reg. 24,976, 24,986, 24,994–97 (May 3, 2011)
    (“NPRM”). Although of the view that no further evidence was
    13
    required to affirm the 2000 Finding, EPA had conducted
    additional quantitative and qualitative analyses “confirm[ing]
    that it remains appropriate and necessary today to regulate
    EGUs under CAA section 112.” 
    Id. at 24,986;
    see 
    id. at 24,999–25,020.
    With respect to the term “appropriate,” EPA
    explained that it was “chang[ing] the position taken in 2005 that
    the appropriate finding could not be based on environmental
    effects alone”; “revisiting the 2005 interpretation that required
    the Agency to consider HAP emissions from EGUs without
    considering the cumulative impacts of all sources of HAP
    emissions”; “revising the 2005 interpretation that required the
    Agency to evaluate the hazards to public health after imposition
    of the requirements of the CAA”; and “rejecting the 2005
    interpretation that authorizes the Agency to consider other
    factors (e.g., cost), even if the agency determines that HAP
    emitted by EGUs pose a hazard to public health (or the
    environment).” 
    Id. at 24,989.
    With respect to the term
    “necessary,” EPA rejected as “unreasonable” its interpretation
    in 2005 that regulation under § 112 was “necessary” only if no
    other provision in the CAA — whether implemented or only
    anticipated — could “directly or indirectly” reduce HAP
    emissions to acceptable levels. 
    Id. at 24,992.
    EPA explained that it interpreted § 112(n)(1)(A)
    to require the Agency to find it appropriate to regulate
    EGUs under CAA section 112 if the Agency
    determines that the emissions of one or more HAP
    emitted from EGUs pose an identified or potential
    hazard to public health or the environment at the time
    the finding is made. If the Agency finds that it is
    appropriate to regulate, it must find it necessary to
    regulate EGUs under section 112 if the identified or
    potential hazards to public health or the environment
    will not be adequately addressed by the imposition of
    14
    the requirements of the CAA. Moreover, it may be
    necessary to regulate utilities under section 112 for a
    number of other reasons, including, for example, that
    section 112 standards will assure permanent reductions
    in EGU HAP emissions, which cannot be assured
    based on other requirements of the CAA.
    
    Id. at 24,987–88.
    EPA also affirmed that coal- and oil-fired
    EGUs were properly listed as a source category under § 112(c).
    See 
    id. at 24,986.
    EPA adhered to these interpretations in the
    Final Rule, 77 Fed. Reg. at 9311. Accordingly, on February 16,
    2012, EPA promulgated emission standards for a number of
    listed HAPs emitted by coal- and oil-fired EGUs. See 
    id. at 9487–93.
    Several petitions for review challenge the Final Rule. We
    first address, in Part II, the challenges of the State, Industry, and
    Labor petitioners. In Part III, we address Industry petitioners’
    specific issues. In Part IV.A, we address the challenges by the
    Environmental petitioners, and in Part IV.B, Julander Energy
    Company’s standing. In addressing the substantive challenges
    to the Final Rule, this court must determine under the CAA
    whether the Final Rule was promulgated in a manner that was
    arbitrary or capricious, an abuse of discretion, or otherwise not
    in accordance with law. See CAA § 307(d)(9)(A), 42 U.S.C.
    § 7607(d)(9)(A). “The ‘arbitrary and capricious’ standard
    deems the agency action presumptively valid provided the action
    meets a minimum rationality standard.” Sierra 
    Club, 353 F.3d at 978
    –79 (quoting Natural Res. Def. Council v. EPA, 
    194 F.3d 130
    , 136 (D.C. Cir. 1999)). That is, “[i]f EPA acted within its
    delegated statutory authority, considered all of the relevant
    factors, and demonstrated a reasonable connection between the
    facts on the record and its decision, we will uphold its
    determination.” Ethyl Corp. v. EPA, 
    51 F.3d 1053
    , 1064 (D.C.
    Cir. 1995). The court will show particular deference “where the
    15
    agency’s decision rests on an evaluation of complex scientific
    data within the agency’s technical expertise.” Troy Corp. v.
    Browner, 
    120 F.3d 277
    , 283 (D.C. Cir. 1997); see also Marsh v.
    Or. Natural Res. Council, 
    490 U.S. 360
    , 377 (1989).
    II.
    State, Industry, and Labor petitioners challenge EPA’s
    interpretation and application of the “appropriate and necessary”
    requirement in § 112(n)(1)(A).
    A.
    As a threshold matter, petitioners contend that the 2000
    Finding was unlawful because EPA did not allow notice and
    comment on the finding, did not quantify the relevant mercury
    emissions and associated health risks, and did not describe
    “alternative control strategies” as required under § 112(n)(1)(A).
    Because the December 2000 notice was “fundamentally
    flawed,” they contend it “could have no legal consequences” and
    “could not provide the basis for a § 112(c) listing decision.”
    State, Industry & Labor Pet’rs’ Br. (hereinafter “SIL Br.”)
    27–28. Without a proper listing under § 112(c), they contend,
    EPA has no authority to regulate EGUs under § 112(d).
    The court need not decide whether EPA’s December 2000
    “appropriate and necessary” finding was procedurally or
    substantively valid because EPA reconsidered and
    “confirm[ed]” that determination in the Final Rule. See NPRM,
    76 Fed. Reg. at 24,977; Final Rule, 77 Fed. Reg. at 9310–11,
    9320. For the reasons we will discuss, we hold that EPA’s
    finding in the Final Rule was substantively and procedurally
    valid, and consequently any purported defects in the 2000
    Finding have been cured, rendering petitioners’ challenge to
    December 2000 “appropriate and necessary” finding moot. Cf.
    Fund for Animals, Inc. v. Hogan, 
    428 F.3d 1059
    , 1063–64 (D.C.
    16
    Cir. 2005).
    B.
    The crux of petitioners’ challenge to the Final Rule focuses
    on EPA’s interpretation of the phrase “appropriate and
    necessary” in § 112(n)(1)(A), 42 U.S.C. § 7412(n)(1)(A). The
    context of this phrase is as follows. In a special subsection on
    EGUs, Congress first directed: “The Administrator shall perform
    a study of the hazards to public health reasonably anticipated to
    occur as a result of emissions by electric utility steam generating
    units of pollutants listed under subsection (f) after imposition of
    the requirements of this Act.” CAA § 112(n)(1)(A), 42 U.S.C.
    § 7412(n)(1)(A) (emphasis added). Congress then directed:
    “The Administrator shall regulate electric utility steam
    generating units under this section, if the Administrator finds
    such regulation is appropriate and necessary after considering
    the results of the study required by this subparagraph.” 
    Id. (emphasis added).
    Apart from the instruction to “consider[] the
    results of the [Utility Study]” on public health hazards from
    EGU emissions, the statute offers no express guidance regarding
    what factors EPA is required or permitted to consider in
    deciding whether regulation under § 112 is “appropriate and
    necessary.” Neither does it define the words “appropriate” or
    “necessary.” See NPRM, 76 Fed. Reg. at 24,986; 2005 Listing
    Decision, 70 Fed. Reg. at 15,997. Petitioners object to how EPA
    chose to fill these gaps.
    In matters of statutory interpretation, the court applies the
    familiar two part test under Chevron U.S.A., Inc. v. Natural
    Resources Defense Council, Inc., 
    467 U.S. 837
    , 842–43 (1984).
    First, the court employs traditional tools of statutory
    construction to determine de novo “whether Congress has
    directly spoken to the precise question at issue.” 
    Id. at 842,
    843
    n.9. If the court “ascertains that Congress had an intention on
    the precise question at issue,” 
    id. at 843
    n.9, “that is the end of
    17
    the matter” and the court “must give effect to the unambiguously
    expressed intent of Congress,” 
    id. at 842–43.
    If, however, “the
    statute is silent or ambiguous with respect to the specific issue,”
    the court will uphold the agency’s interpretation so long as it
    constitutes “a permissible construction of the statute.” 
    Id. at 843.
    “In such case, a court may not substitute its own
    construction of a statutory provision for a reasonable
    interpretation made by the administrator of an agency.” 
    Id. at 844.
    To the extent petitioners’ challenge concerns EPA’s change
    in interpretation from that in 2005, our approach is the same
    because “[a]gency inconsistency is not a basis for declining to
    analyze the agency’s interpretation under the Chevron
    framework.” Nat’l Cable & Telecomms. Ass’n v. Brand X
    Internet Servs., 
    545 U.S. 967
    , 981 (2005). That is, “if the
    agency adequately explains the reasons for a reversal of policy,
    change is not invalidating, since the whole point of Chevron is
    to leave the discretion provided by the ambiguities of a statute
    with the implementing agency.” 
    Id. (internal quotation
    marks
    omitted). And while “[u]nexplained inconsistency” may be “a
    reason for holding an interpretation to be an arbitrary and
    capricious change from agency practice,” 
    id., our review
    of a
    change in agency policy is no stricter than our review of an
    initial agency action, see FCC v. Fox Television Stations, Inc.,
    
    556 U.S. 502
    , 514–16 (2009). Thus, although an agency may
    not “depart from a prior policy sub silentio or simply disregard
    rules that are still on the books,” the agency “need not
    demonstrate to a court’s satisfaction that the reasons for the new
    policy are better than the reasons for the old one.” 
    Id. at 515.
    Rather, “it suffices that the new policy is permissible under the
    statute, that there are good reasons for it, and that the agency
    believes it to be better.” 
    Id. 18 1.
    Reliance on delisting criteria. In the Final Rule, EPA
    concluded that it is “appropriate and necessary” to regulate HAP
    emissions on the basis, inter alia, that EGU emissions of certain
    HAPs pose a cancer risk higher than the standard set forth in the
    § 112(c)(9) delisting criteria (i.e., greater than one in a million
    for the most exposed individual). See Final Rule, 77 Fed. Reg.
    at 9311; NPRM, 76 Fed. Reg. at 24,998. Petitioners contend
    that by so doing EPA wrongly conflated the delisting criteria
    with the “appropriate and necessary” determination. “By
    applying the delisting provisions of § 112(c)(9) in making the
    initial, pre-listing determination whether it is ‘appropriate and
    necessary’ to regulate EGUs, EPA has unlawfully imposed
    requirements on itself the Congress chose not to impose at the
    listing stage.” SIL Br. 35. They maintain that EPA’s approach
    “would treat EGUs the same as all other major source categories
    — as a category that must be listed unless the delisting criteria
    are met.” 
    Id. EPA explained
    that it was relying upon the delisting criteria
    to interpret an ambiguous term in § 112(n)(1)(A), namely,
    “hazards to public health,” see Final Rule, 77 Fed. Reg. at
    9333–34; NPRM, 76 Fed. Reg. at 24,992–93, because the
    phrase “hazards to public health” is nowhere defined in the
    CAA. EPA looked to the delisting criteria, which specify the
    risk thresholds below which a source category need not be
    regulated, as evidence of congressional judgment as to what
    degree of risk constitutes a health hazard. See 
    id. EPA explained:
    Although Congress provided no definition of hazard to
    public health, section 112(c)(9)(B) is instructive. In
    that section, Congress set forth a test for removing
    source categories from the section 112(c) source
    category list. That test is relevant because it reflects
    Congress’ view as to the level of health effects
    19
    associated with HAP emissions that Congress thought
    warranted continued regulation under section 112.
    NPRM, 76 Fed. Reg. at 24,993 (emphasis added); see Final
    Rule, 77 Fed. Reg. at 9333–34. EPA concluded that it had
    discretion also to consider various other factors in evaluating
    hazards to public health, including
    the nature and severity of the health effects associated
    with exposure to HAP emissions; the degree of
    confidence in our knowledge of those health effects;
    the size and characteristics of the populations affected
    by exposures to HAP emissions; [and] the magnitude
    and breadth of the exposures and risks posed by HAP
    emissions from a particular source category, including
    how those exposures contribute to risk in populations
    with additional exposures to HAP from other sources[.]
    NPRM, 76 Fed. Reg. at 24,992; see Final Rule, 77 Fed. Reg. at
    9334.
    EPA reasonably relied on the § 112(c)(9) delisting criteria
    to inform its interpretation of the undefined statutory term
    “hazard to public health.” Congress did not specify what types
    or levels of public health risks should be deemed a “hazard” for
    purposes of § 112(n)(1)(A). By leaving this gap in the statute,
    Congress delegated to EPA the authority to give reasonable
    meaning to the term. Cf. 
    Chevron, 467 U.S. at 843
    –44. EPA’s
    approach does not, as petitioners contend, “treat EGUs the same
    as all other major source categories.” SIL Br. 35. Other major
    source categories must be listed unless the delisting criteria are
    satisfied; EPA’s approach treats EGUs quite differently. For
    EGUs, EPA reasonably determined that it may look at a broad
    range of factors — only one of which concerned the § 112(c)(9)
    benchmark levels — in assessing the health hazards posed by
    20
    EGU HAPs. Nowhere does EPA state or imply that the delisting
    criteria provide the sole basis for determining whether it is
    “appropriate and necessary” to regulate EGUs under § 112.
    Because EPA’s approach is based on a permissible construction
    of § 112(n)(1)(A), it is entitled to deference and must be upheld.
    2. Costs of regulation. Noting that in 2005 EPA construed
    § 112(n)(1)(A) to allow consideration of costs in determining
    whether regulation of EGU HAP emissions is “appropriate,”
    petitioners contend that EPA’s new interpretation to “preclude
    consideration of costs,” SIL Br. 42, “unreasonably constrains the
    language of § 112(n)(1)(A),” SIL Br. 39. They point to the
    dictionary definition of “appropriate” and to the differences
    between regulation of EGUs under § 112(n)(1)(A) and
    regulating other sources under § 112(c), and to this court’s
    precedent that “only where there is ‘clear congressional intent to
    preclude consideration of cost’ [do] we find agencies barred
    from considering costs.” SIL Br. 40 (quoting Michigan v. EPA,
    
    213 F.3d 663
    , 678 (D.C. Cir. 2000), cert. denied, 
    532 U.S. 904
    (2001)). They contend that EPA’s new interpretation “is also
    unlawful because it eliminates the discretion that Congress
    intended EPA to exercise after completing the Utility Study.”
    SIL Br. 41. As they see it, if the statutory term “appropriate”
    imposes any limit whatsoever, it must at least limit regulation to
    “risks [that] are worth the cost of elimination.” SIL Reply Br.
    14 (quoting Michigan v. 
    EPA, 213 F.3d at 667
    (addressing the
    term “significant”)).
    In the Final Rule, EPA stated that “it is reasonable to make
    the listing decision, including the appropriate determination,
    without considering costs.” Final Rule, 77 Fed. Reg. at 9327.
    EPA reasoned that § 112(n)(1)(A) would have included an
    “express statutory requirement that the Agency consider costs in
    making the appropriate determination” if Congress wanted to
    require EPA to do so. 
    Id. EPA also
    noted that “[t]o the extent
    21
    [its] interpretation differs from the one set forth in 2005,” it had
    “fully explained the basis for such changes.” 
    Id. at 9323
    (citing
    NPRM, 76 Fed. Reg. at 24,986–93). (Even in 2005, EPA noted
    only that “[n]othing precludes EPA from considering costs in
    assessing whether regulation of [EGUs] under section 112 is
    appropriate in light of all the facts and circumstances presented.”
    2005 Delisting Decision, 70 Fed. Reg. at 16,001 n.19.) In
    responding to comments reacting to its position that “the better
    reading of the term ‘appropriate’ is that it does not allow for the
    consideration of costs in assessing whether hazards to public
    health or the environment are reasonably anticipated to occur
    based on EGU emissions,” NPRM, 76 Fed. Reg. at 24,989, EPA
    observed that the dictionary definition of “appropriate” does not
    require consideration of costs and that commenters had failed to
    identify an express statutory requirement to that effect. EPA
    also stated that it was reasonable to decline to consider costs in
    the absence of an express statutory requirement to do so because
    Congress, in enacting § 112, was principally concerned with
    mitigating hazards to public health and the environment from
    HAP emissions. See Final Rule, 77 Fed. Reg. at 9327.
    Inasmuch as Congress had treated the regulation of HAP
    emissions differently in the 1990 Amendments because EPA
    was not acting quickly enough, EPA concluded it was
    reasonable to make a listing decision without considering costs.
    See 
    id. On its
    face, § 112(n)(1)(A) neither requires EPA to consider
    costs nor prohibits EPA from doing so. Indeed, the word
    “costs” appears nowhere in subparagraph A. In the absence of
    any express statutory instruction regarding costs, petitioners rely
    on the dictionary definition of “appropriate” — meaning
    “especially suitable or compatible” or “suitable or proper in the
    circumstances” — to argue that EPA was required “to take into
    account costs to the nation’s electricity generators when
    deciding whether to regulate EGUs.” SIL Br. 39 (citing
    22
    MERRIAM-WEBSTER’S ONLINE DICTIONARY; NEW OXFORD
    AMERICAN DICTIONARY (2d ed. 2005)). Yet these definitions,
    which do not mention costs, merely underscore that the term
    “appropriate” is “open-ended,” “ambiguous,” and “inherently
    context-dependent.” Sossamon v. Texas, 
    131 S. Ct. 1651
    , 1659
    (2011); cf. Nat’l Ass’n of Clean Air Agencies v. EPA, 
    489 F.3d 1221
    , 1229 (D.C. Cir. 2007).
    Even if the word “appropriate” might require cost
    consideration in some contexts, such a reading of “appropriate”
    is unwarranted here, where Congress directed EPA’s attention
    to the conclusions of the study regarding public health hazards
    from EGU emissions. Throughout § 112, Congress mentioned
    costs explicitly where it intended EPA to consider them. Cf.
    CAA § 112(d)(2), 112(d)(8)(A)(i), 112(f)(1)(B), 112(f)(2)(A),
    112(n)(1)(B), 112(s)(2), 42 U.S.C. § 7412(d)(2),
    7412(d)(8)(A)(i), 7412(f)(1)(B), 7412(f)(2)(A), 7412(n)(1)(B),
    7412(s)(2). Indeed, in the immediately following subparagraph
    of § 112(n), Congress expressly required costs to be considered.
    CAA § 112(n)(1)(B), 42 U.S.C. § 7412(n)(1)(B). The contrast
    with subparagraph A could not be more stark. “Where Congress
    includes particular language in one section of a statute but omits
    it in another section of the same Act, it is generally presumed
    that Congress acts intentionally . . . in the disparate inclusion or
    exclusion.” Russello v. United States, 
    464 U.S. 16
    , 23 (1983)
    (alterations omitted); cf. Catawba Cnty., N.C. v. EPA, 
    571 F.3d 20
    , 36 (D.C. Cir. 2009). Petitioners offer no compelling reason
    why Congress, by using only the broad term “appropriate,”
    would have intended the same result — that costs be considered
    — in § 112(n)(1)(A). The legislative history the dissent claims
    “establishes” the point, Dissent at 13, consists of a Floor
    statement by a single Congressman that at best is ambiguous.1
    1
    See 1 A LEGISLATIVE HISTORY OF THE CLEAN AIR ACT
    AMENDMENTS OF 1990, at 1416–17 (1993) (statement by Rep. Oxley)
    23
    For these reasons, we conclude that the statute does not evince
    unambiguous congressional intent on the specific issue of
    whether EPA was required to consider costs in making its
    “appropriate and necessary” determination under
    § 112(n)(1)(A).
    Turning to EPA’s approach, its position that “nothing about
    the definition of [‘appropriate’] compels a consideration of
    costs,” Final Rule, 77 Fed. Reg. at 9327, is clearly permissible.
    In Whitman v. American Trucking Ass’ns, 
    531 U.S. 457
    (2001),
    Justice Scalia, writing for a unanimous Court, noted that the
    Supreme Court has “refused to find implicit in ambiguous
    sections of the CAA an authorization to consider costs that has
    elsewhere, and so often, been expressly granted.” 
    Id. at 467;
    see
    also Natural Res. Def. Council v. U.S. EPA, 
    824 F.2d 1146
    ,
    1163–65 (D.C. Cir. 1987) (en banc). EPA’s interpretation is
    consistent with that instruction. Just as in Whitman, EPA
    declines to find in an ambiguous section what in so many other
    CAA sections Congress has mentioned expressly. And even
    assuming Whitman might be distinguished on grounds it
    concerned a different provision of the CAA, the question
    remains only whether EPA’s interpretation is permissible.
    Petitioners cannot point to a single case in which this court has
    required EPA to consider costs where the CAA does not
    expressly so instruct. In Michigan v. EPA, this court merely
    held that “the agency was free to consider . . . costs” under CAA
    § 110(a)(2)(D), 42 U.S.C. § 7410(a)(2)(D), as EPA had urged in
    that 
    case. 213 F.3d at 679
    (emphasis added).
    (indicating that the provision authorizing regulation of EGUs would
    “avoid[] the imposition of excessive and unnecessary costs” by
    ensuring that EPA can regulate “only if the studies described in
    section 112(n) clearly establish that emissions . . . from such units
    cause a significant risk of serious adverse effects on public health”).
    24
    EPA’s interpretation is also consistent with the purpose of
    the 1990 Amendments, which were aimed at remedying “the
    slow pace of EPA’s regulation of HAPs” following the initial
    passage of the CAA. New 
    Jersey, 517 F.3d at 578
    . To ensure
    that HAP emissions would be reduced to at least minimally-
    acceptable levels, Congress, among other things, listed 189 HAP
    substances for regulation and “restrict[ed] the opportunities for
    EPA and others to intervene in the regulation of HAP sources.”
    
    Id. The overall
    purpose of the 1990 Amendments was to spur
    EPA to action. Although Congress gave EGUs a three-year pass
    when it instructed EPA to conduct a further study before
    regulating EGUs, see CAA § 112(n)(1)(A), 42 U.S.C.
    § 7412(n)(1)(A), there is no indication that Congress did not
    intend EPA to regulate EGUs if and when their public health
    hazards were confirmed by the study, as they were here.
    Petitioners, and our dissenting colleague, suggest that
    EPA’s interpretation is unreasonable because the notion that
    Congress would have authorized EPA to regulate without any
    consideration of regulatory costs is implausible. But this
    argument rests on a false premise. Here, as in Whitman,
    interpreting one isolated provision not to require cost
    consideration does not indicate that Congress was unconcerned
    with costs altogether, because Congress accounted for costs
    elsewhere in the statute. Section 112(d)(2) expressly requires
    EPA to “tak[e] into consideration the cost of achieving . . .
    emission reduction[s]” when setting the level of regulation under
    § 112. CAA § 112(d)(2), 42 U.S.C. § 7412(d)(2). It is true that
    this cost consideration requirement does not apply with respect
    to MACT floors. Yet even for MACT floors, costs are reflected
    to some extent because the floors correspond (by definition) to
    standards that better-performing EGUs have already achieved,
    presumably in a cost efficient manner.                See CAA
    § 112(d)(3)(A), 42 U.S.C. § 7412(d)(3)(A). Moreover, Industry
    respondent intervenors point out that petitioners’ proposed
    25
    approach would lead to an improbable “all-or-nothing” scheme
    in which EPA could “choose not to regulate EGUs at all under
    Section 112 based on cost, even though EPA could not consider
    cost to justify a less stringent emission standard than the MACT
    floor.” Indus. Resp’t Intvn’rs’ Br. 8.
    Contrary to petitioners’ claims, the word “appropriate” is
    not rendered meaningless unless interpreted to include cost
    consideration. Petitioners contend that § 112(n)(1)(A) mandates
    a two-step inquiry: EPA must “first identify ‘a health hazard’
    from HAPs emitted from EGUs, and then determine whether
    regulation of that health hazard is ‘appropriate and necessary.’”
    SIL Br. 41 (emphasis added). If the existence of a health hazard
    automatically means regulation is appropriate, they contend,
    then EPA has unlawfully abdicated the exercise of discretion
    Congress delegated to it. This argument, too, is unpersuasive.
    First, the rulemaking record reflects that EPA did not focus
    exclusively on health hazards in considering whether regulation
    would be “appropriate”; EPA also considered “the availability
    of controls to address HAP emissions from EGUs.” NPRM, 76
    Fed. Reg. at 24,989; see 
    id. at 24,997;
    see also Final Rule, 77
    Fed. Reg. at 9311. The factual premise of petitioners’ argument
    is therefore incorrect. Second, even if EPA had focused
    exclusively on health hazards, the word “appropriate” would
    still have meaning in § 112(n)(1)(A) because the provision does
    not assume, as petitioners seem to suggest, that EPA would in
    fact “identify ‘a health hazard’” from EGUs. SIL Br. 41.
    Rather, the statute directs EPA to “perform a study of the
    hazards to public health reasonably anticipated to occur” and
    then to “regulate [EGUs] . . . if the Administrator finds such
    regulation is appropriate and necessary after considering the
    results of the study.” CAA § 112(n)(1)(A), 42 U.S.C.
    § 7412(n)(1)(A) (emphasis added). At the time Congress
    enacted the 1990 Amendments, it was possible that the Utility
    Study would fail to identify significant health hazards from
    26
    EGU HAP emissions. (Indeed, petitioners argue that it did fail
    to do so. See SIL Br. 13, 48–54.) Therefore, EPA had to
    “consider[] the results of the study” in order to determine
    whether regulation would be “appropriate” based on its
    assessment of the existence and severity of such health hazards.
    The term “appropriate” plainly plays a role: it requires EPA to
    apply its judgment in evaluating the results of the study.
    Basically, petitioners and our dissenting colleague seek to
    impose a requirement that Congress did not. What they ignore
    is that Congress sought, as a threshold matter, to have EPA
    confirm the nature of public health hazards from EGU
    emissions. That is the clear focus of § 112(n)(1)(A). After that,
    Congress left it to the expertise and judgment of EPA whether
    or not to regulate. For EPA to focus its “appropriate and
    necessary” determination on factors relating to public health
    hazards, and not industry’s objections that emission controls are
    costly, properly puts the horse before the cart, and not the other
    way around as petitioners and our dissenting colleague urge.
    Given Congress’s efforts in the 1990 Amendments to promote
    regulation of hazardous pollutants, EPA’s interpretation of
    § 112(n)(1)(A) appears consistent with Congress’s intent.
    Recall that only EGUs’ hazardous emissions were relieved of
    regulation until completion of a study, and once the study
    confirmed the serious public health effects of hazardous
    pollutants from EGUs, Congress gave no signal that the matter
    should end if remediation would be costly.
    Our dissenting colleague has written a powerful-sounding
    dissent. It sounds powerful, however, only because it elides the
    distinction between EPA’s initial decision regarding whether to
    list EGUs as sources of hazardous air pollutants, and its
    subsequent decision regarding whether to issue stringent
    beyond-the-floor standards for such sources. The dissent refers
    to both together as the MACT “program.” Dissent at 3. But the
    27
    “program” in fact proceeds in two stages, as the dissent
    acknowledges. It is only as to the first, listing stage that EPA
    has determined it should not consider costs. That stage leads
    only to the setting of the statutory MACT floor which, as the
    dissent notes, is a “minimum stringency level.” 
    Id. The second
    stage leads to beyond-the-floor standards, which are more
    restrictive. When setting those, EPA does consider costs.
    The dissent contends that “[m]eeting that [MACT] floor
    will be prohibitively expensive, particularly for many coal-fired
    utilities,” forcing them “out of business.” Dissent at 10–11. But
    in the Final Rule EPA rejected this contention, concluding that
    “the estimated number of early retirements,” of EGUs “that may
    result from this rule is . . . less than 2 percent of all U.S. coal-
    fired capacity” in 2015. Final Rule, 77 Fed. Reg. at 9416; see
    also 
    id. at 9408
    (rejecting the claim that the Final Rule “will
    result in substantial power plant retirements”). Petitioners have
    not challenged that conclusion. Industry respondent intervenors
    further observe that continuing to exempt EGUs from HAP
    regulation penalizes those plants that have made investments in
    clean air technology, and that “[t]he Rule merely requires
    owners of uncontrolled plants to install and operate control
    technology already operating at their competitors’ plants, both
    leveling the playing field and improving health and the
    environment.” Indus. Resp’t Intv’nrs’ Br. 7. The Final Rule,
    which, as the dissent notes, EPA has calculated will cost $9.6
    billion a year, includes the cost of both stages. EPA also has
    concluded under Executive Order 13563 that the annualized
    benefits are $37 to $90 billion. See Final Rule, 77 Fed. Reg. at
    9306. (The dissent questions this conclusion, notwithstanding
    its promise that agency cost-benefit analyses should be reviewed
    deferentially.) That’s “billion with a b,” in the dissent’s catchy
    phrase. Dissent at 1. In short, “the benefits of this rule
    outweigh its costs by between 3 to 1 or 9 to 1.” Final Rule, 77
    Fed. Reg. at 9306.
    28
    As the agency noted, “[u]nder section 112(n)(1)(A), EPA is
    evaluating whether to regulate HAP emissions from EGUs at
    all.” NPRM, 76 Fed. Reg. at 24,989 (emphasis added). And
    there was nothing unreasonable about its conclusion that costs
    should not be considered in determining “whether HAP
    emissions from EGUs pose a hazard to public health or the
    environment.” 
    Id. at 24,988;
    see 
    id. at 24,990.
    That is
    especially so when “Congress did not authorize the
    consideration of costs in listing any [other] source categories for
    regulation under section 112 . . . [and] did not permit the
    consideration of costs in evaluating whether a source category
    could be delisted pursuant to the provisions of section
    112(c)(9).” 
    Id. at 24,989.
    And while the dissent insists on “the
    centrality of cost consideration to proper regulatory
    decisionmaking,” Dissent at 6, Whitman makes clear the
    Supreme Court believes that Congress does not necessarily
    agree. Nor is Whitman the only case in which courts have found
    that Congress legislated in a way the dissent would find
    irrational.2
    2
    See Am. Textile Mfrs. Inst. v. Donovan, 
    452 U.S. 490
    ,
    511–12 (1981) (holding that OSHA is not required to conduct a cost-
    benefit analysis in promulgating a standard under section 6(b)(5) of
    the Occupational Safety and Health Act because “Congress uses
    specific language when intending that an agency engage in cost-
    benefit analysis”); Tenn. Valley Auth. v. Hill, 
    437 U.S. 153
    , 184
    (1978) (“The plain intent of Congress in enacting [the Endangered
    Species Act] was to halt and reverse the trend towards species
    extinction, whatever the cost.”); Union Elec. Co. v. EPA, 
    427 U.S. 246
    , 257–58 (1976) (holding that EPA may not consider claims of
    economic infeasibility in evaluating a state requirement that primary
    ambient air quality standards be met by a certain deadline); Lead
    Indus. Ass’n v. EPA, 
    647 F.2d 1130
    , 1150 (D.C. Cir. 1980) (“We are
    unable to discern here any congressional intent to require, or even
    permit, [EPA] to consider economic . . . factors in promulgating air
    quality standards [under the CAA].”).
    29
    Academic generalities, see Dissent at 6–8, do not
    demonstrate that EPA could not reasonably proceed as it did in
    interpreting congressional intent — especially not generalities
    by academics who are criticizing the Supreme Court for failing
    to read congressional statutes as they do.3 The same is true of
    utterances by single Justices — especially a separate statement
    by one Justice concurring in Whitman and a question by another
    during oral argument about a different statutory section. See
    Dissent at 6–7. Nor do the different approaches of the Bush and
    Obama Administrations on the role of costs in implementing the
    CAA do more than demonstrate that administrations may differ
    and can change positions without legal jeopardy, so long as an
    adequate explanation is provided as was done here. See
    
    Chevron, 467 U.S. at 865
    –66. The question before the court is
    not “Should EPA have considered costs in making its threshold
    determination under § 112(n)(1)(A)?” but rather “Was EPA
    required to do so at that point in its regulatory evaluation?”
    EPA has explained why it concluded costs were not part of the
    “appropriate and necessary” determination, and given
    Congress’s choice to leave the factors entering into that
    determination to EPA, petitioners, and our dissenting colleague,
    fail to demonstrate that EPA’s considered judgment about the
    factors to be considered was unlawful as an impermissible and
    unreasonable interpretation of § 112(n)(1)(A). Congress left to
    3
    See Cass R. Sunstein, Interpreting Statutes in the Regulatory
    State, 103 HARV. L. REV. 405, 492–93 (1989) (criticizing American
    Textile Manufacturers Institute, 
    452 U.S. 490
    , for “contributing to the
    irrationality of the Occupational Safety and Health Act” by “refusing
    to read the statute” as the author would); Cass R. Sunstein, Cost-
    Benefit Default Principles, 99 MICH. L. REV. 1651, 1671 (2001)
    (same); Richard J. Pierce, Jr., The Appropriate Role of Costs in
    Environmental Regulation, 54 ADMIN L. REV. 1237, 1253 (2002)
    (criticizing the Whitman Court for relying on an “anti-cost canon”).
    30
    EPA “the accommodation of manifestly competing interests,”
    
    id. at 865,
    and EPA did all that Congress required of it. Exactly
    how and when EGU emissions are to be regulated is a different
    question.
    For these reasons, we hold that EPA reasonably concluded
    it need not consider costs in making its “appropriate and
    necessary” determination under § 112(n)(1)(A).
    3. Environmental harms. Petitioners also contend that EPA
    was constrained to consider only public health hazards, not
    environmental or other harms, in making its “appropriate and
    necessary” determination. In their view, § 112(n)(1)(A)
    unambiguously forecloses the consideration of non-health
    effects because the statute requires EPA to make its “appropriate
    and necessary” determination after considering the results of the
    Utility Study, which is focused exclusively on identifying
    “hazards to public health” caused by EGU HAP emissions. See
    SIL Br. 44. Petitioners insist that in 2005 EPA followed the
    health-only approach.
    EPA reasoned that “nothing in the statute suggests that the
    [EPA] should ignore adverse environmental effects in
    determining whether to regulate EGUs under section 112.”
    NPRM, 76 Fed. Reg. at 24,988; see Final Rule, 77 Fed. Reg. at
    9325. To the contrary, EPA concluded that the purpose of the
    CAA and the statute’s express instruction to assess
    environmental effects in the Mercury Study suggest “it is
    reasonable to consider environmental effects in evaluating the
    hazards posed by HAP emitted from EGUs.” NPRM, 76 Fed.
    Reg. at 24,988; see Final Rule, 77 Fed. Reg. at 9325. EPA
    explained in response to comments that restricting it from
    considering environmental harms would “incorrectly conflate[]
    the requirements for the Utility Study with the requirement to
    regulate EGUs under CAA section 112 if EPA determines it is
    31
    appropriate and necessary to do so.” Final Rule, 77 Fed. Reg. at
    9325.
    EPA did not err in considering environmental effects
    alongside health effects for purposes of the “appropriate and
    necessary” determination. Although petitioners’ interpretation
    of § 112(n)(1)(A) is plausible, the statute could also be read to
    treat consideration of the Utility Study as a mere condition
    precedent to the “appropriate and necessary” determination.
    EPA has consistently adopted this latter interpretation, including
    in 2005. See 2005 Delisting Decision, 70 Fed. Reg. at 16,002.
    In the absence of any limiting text, and considering the context
    (including § 112(n)(1)(B)) and purpose of the CAA, EPA
    reasonably concluded that it could consider environmental
    harms in making its “appropriate and necessary” determination.
    The court need not decide whether environmental effects alone
    would allow EPA to regulate EGUs under § 112, because EPA
    did not base its determination solely on environmental effects.
    As we explain, infra Part II.B.5, EPA’s decision to list EGUs
    can be sustained on the basis of its findings regarding health
    hazards posed by EGU HAP emissions.
    4. Cumulative impacts of HAP emissions. On the grounds
    that § 112(n)(1)(A) directs EPA to study hazards reasonably
    anticipated to occur “as a result of” EGU HAP emissions,
    petitioners contend that EPA was required to base its
    “appropriate and necessary” determination on public health
    hazards that occur exclusively due to EGU HAPs. Thus, they
    contend, EPA erred in considering EGU HAP emissions that
    merely “contribute to” or exacerbate otherwise-occurring health
    hazards. Petitioners point out that EPA’s interpretation conflicts
    with its approach in 2005, when it read § 112(n)(1)(A) to
    authorize regulation only upon a showing that EGU emissions
    alone would cause harm.
    32
    EPA explained that it could reasonably consider the
    cumulative impacts of HAP emissions because
    focusing on HAP emissions from EGUs alone when
    making the appropriate finding ignores the manner in
    which public health and the environment are affected
    by air pollution. An individual that suffers adverse
    health effects as the result of the combined HAP
    emissions from EGUs and other sources is harmed,
    irrespective of whether HAP emissions from EGUs
    alone would cause the harm.
    NPRM, 76 Fed. Reg. at 24,988; see Final Rule, 77 Fed. Reg. at
    9325. EPA acknowledged it was departing from its 2005
    approach, see NPRM, 76 Fed. Reg. at 24,989, but justified the
    departure on grounds that the 2005 approach had been “flawed”
    and “non-scientific” to the extent that “EPA [had] incorrectly
    determined that U.S. EGU emissions of [mercury] did not
    constitute a hazard to public health,” 
    id. at 25,019;
    cf. Final
    Rule, 77 Fed. Reg. at 9322–23.
    EPA’s interpretation in the Final Rule is entitled to
    deference. Section 112(n)(1)(A)’s reference to hazards
    occurring “as a result of” EGU HAP emissions could connote
    hazards caused solely by EGU emissions, but it could also
    connote hazards exacerbated by EGU emissions. EPA’s
    commonsense approach to this statutory ambiguity was well
    within the bounds of its discretion, and it adequately explained
    its reversal from 2005. Petitioners’ contention that EPA erred
    in considering the effects of HAPs emitted by non-EGU sources
    is therefore unavailing. In any event, EPA concluded in the
    Mercury Study that “even if there were no other sources of
    [mercury] exposure, exposures associated with deposition
    attributable to U.S. EGUs” would place the most susceptible
    populations above the methylmercury reference dose. NPRM,
    33
    76 Fed. Reg. at 25,010. Thus, EPA did find, as petitioners
    contend it was required to do, that EGU emissions alone would
    cause health hazards.
    5. Regulation under § 112(d). Petitioners contend that even
    if it is “appropriate and necessary” to regulate EGU HAP
    emissions, such regulation should be effected under
    § 112(n)(1)(A) to the degree appropriate and necessary — not
    under § 112(d) through the imposition of MACT standards.
    They maintain that regulation of EGU HAPs that do not pose
    health hazards, or regulation at a level higher than needed to
    eliminate such hazards, is not regulation that is “appropriate and
    necessary.” Petitioners contend that § 112(n)(1)(A)’s instruction
    to “regulate electric steam generating units under this section”
    (emphasis added) — rather than “under § 112(d)” — evinces
    congressional intent that EGU HAPs should be regulated
    differently than other sources. SIL Br. 36.
    EPA expressly considered and dismissed petitioners’
    proposed interpretation. EPA concluded that the phrase “under
    this section” presumptively refers to regulation under section
    112, not to regulation under subparagraph 112(n)(1)(A). See
    Final Rule, 77 Fed. Reg. at 9330; NPRM, 76 Fed. Reg. at
    24,993. Thus, the plain statutory language suggests “EGUs
    should be regulated in the same manner as other categories for
    which the statute requires regulation.” Final Rule, 77 Fed. Reg.
    at 9330. EPA explained:
    CAA section 112 establishes a mechanism to list and
    regulate stationary sources of HAP emissions.
    Regulation under CAA section 112 generally requires
    listing under CAA section 112(c)[] [and] regulation
    under CAA section 112(d)[.] . . . A determination that
    EGUs should be listed once the prerequisite
    appropriate and necessary finding is made is wholly
    34
    consistent with the language of section 112(n)(1)(A),
    and listed sources must be regulated under CAA
    section 112(d).
    Id.; see also 
    id. at 9326.
    EPA acted properly in regulating EGUs under § 112(d).
    Section 112(n)(1)(A) directs the Administrator to “regulate
    electric steam generating units under this section, if the
    Administrator finds such regulation is appropriate and
    necessary.” CAA § 112(n)(1)(A), 42 U.S.C. § 7412(n)(1)(A).
    EPA reasonably interprets the phrase “under this section” to
    refer to the entirety of section 112. See Desert Citizens Against
    Pollution v. EPA, 
    66 F.3d 524
    , 527 (D.C. Cir. 2012). Under
    section 112, the statutory framework for regulating HAP sources
    appears in § 112(c), which covers listing, and § 112(d), which
    covers standard-setting. See CAA § 112(c), 112(d), 42 U.S.C.
    § 7412(c), 7412(d). This court has previously noted that “where
    Congress wished to exempt EGUs from specific requirements of
    section 112, it said so explicitly.” New 
    Jersey, 517 F.3d at 583
    .
    EPA reasonably concluded that the framework set forth in
    § 112(c) and § 112(d) — rather than another, hypothetical
    framework not elaborated in the statute — provided the
    appropriate mechanism for regulating EGUs under § 112 after
    the “appropriate and necessary” determination was made.
    Therefore, EPA’s interpretation is entitled to deference and must
    be upheld.
    6. Regulation of all HAP emissions. In the Final Rule, EPA
    claimed authority to promulgate standards for all listed HAPs
    emitted by EGUs, not merely for those HAPs it has expressly
    determined to cause health or environmental hazards. See, e.g.,
    77 Fed. Reg. at 9325–26. Petitioners challenge this approach,
    maintaining that § 112(n)(1)(A) limits regulation to those
    individual HAPs that are “appropriate and necessary” to
    35
    regulate. Petitioners also object that EPA’s interpretation
    contradicts its 2005 rulemaking when it supported a substance-
    by-substance approach to regulation.
    EPA explained its disagreement with petitioners’ proposed
    approach. First, EPA reiterated its view that once an
    “appropriate and necessary” determination is properly made,
    “EGUs should be regulated under section 112 in the same
    manner as other categories for which the statute requires
    regulation.” Final Rule, 77 Fed. Reg. at 9326. EPA then
    reasoned that this court’s decision in National 
    Lime, 233 F.3d at 633
    , “requires [EPA] to regulate all HAP from major sources of
    HAP emissions once a source category is added to the list of
    categories under CAA section 112(c).” 
    Id. (emphasis added).
    In other words, EPA concluded that if EGUs are to be regulated
    in the same manner as other source categories, then all HAPs
    emitted by EGUs should be subject to regulation. See 
    id. EPA did
    not err by concluding that it may regulate all HAP
    substances emitted by EGUs. In National 
    Lime, 233 F.3d at 633
    , this court considered whether § 112(d)(1) permitted EPA
    “to set emission levels only for those listed HAPs” that could be
    controlled with existing technology. Concluding that EPA had
    a “clear statutory obligation to set emission standards for each
    listed HAP,” the court held that “the absence of technology-
    based pollution control devices for HCl, mercury, and total
    hydrocarbons did not excuse EPA from setting emission
    standards for those pollutants.” 
    Id. at 634.
    Although petitioners
    attempt to distinguish National Lime on grounds that it
    concerned “major sources” rather than EGUs, they have not
    provided any compelling reason why EGUs should not be
    regulated the same way as other sources once EPA has
    determined that regulation under § 112 is “appropriate and
    necessary.” It also bears emphasis that the plain text of
    § 112(n)(1)(A) directs the Administrator to “regulate electric
    36
    utility steam generating units” — not to regulate their emissions,
    as petitioners suggest. This source-based approach to regulating
    EGU HAPs was affirmed in New 
    Jersey, 517 F.3d at 582
    , which
    held that EGUs could not be delisted without demonstrating that
    EGUs, as a category, satisfied the delisting criteria set forth in
    § 112(c)(9). The notion that EPA must “pick and choose”
    among HAPs in order to regulate only those substances it deems
    most harmful is at odds with the court’s precedent.
    To the extent EPA’s interpretation differs from its 2005
    approach, it adequately explained its decision. See Final Rule,
    77 Fed. Reg. at 9325–26. Although petitioners suggest
    otherwise, the 2005 Delisting Decision did not address whether
    EPA could regulate all listed EGU HAPs following an
    “appropriate and necessary” determination. Here, EPA offered
    a reasoned explanation for its approach; no more is required.
    See Fox Television 
    Stations, 556 U.S. at 515
    ; Nat’l Cable &
    Telecomms. 
    Ass’n, 545 U.S. at 981
    .
    In view of the above, EPA’s conclusion that it may regulate
    all HAP emissions from EGUs must be upheld.
    III.
    A.
    Petitioners assert that even if EPA has correctly interpreted
    § 112(n)(1)(A), the emission standards that EPA promulgated in
    the Final Rule are flawed in several respects.
    1. Appropriate and necessary determination. Petitioners
    first contend that the agency’s determination that it was
    “appropriate and necessary” to regulate EGUs is arbitrary and
    capricious. Consistent with their position on the proper
    interpretation of § 112(n)(1)(A), petitioners take a HAP-by-HAP
    approach to criticizing EPA’s Finding. But, as we explained
    above, EPA reasonably interprets the CAA as allowing it to
    37
    regulate all EGU HAP emissions pursuant to the usual MACT
    program once it makes the threshold “appropriate and
    necessary” determination. The question then is whether EPA
    reasonably found it appropriate and necessary to regulate EGUs
    based on all the record evidence before it.
    EPA’s “appropriate and necessary” determination in 2000,
    and its reaffirmation of that determination in 2012, are amply
    supported by EPA’s findings regarding the health effects of
    mercury exposure. Mercury exposure has adverse effects on
    human health, primarily through consumption of fish in which
    mercury has bioaccumulated. See Final Rule, 77 Fed. Reg. at
    9310. And EGUs are the largest domestic source of mercury
    emissions. 
    Id. Petitioners do
    not dispute these basic facts, but
    instead take issue with whether EPA has sufficiently quantified
    the contribution of EGU mercury emissions to overall mercury
    exposure. Our case law makes clear, however, that EPA is not
    obligated to conclusively resolve every scientific uncertainty
    before it issues regulation. See Coal. for Responsible
    Regulation v. EPA, 
    684 F.3d 102
    , 121 (D.C. Cir. 2012) (“If a
    statute is precautionary in nature and designed to protect the
    public health, and the relevant evidence is difficult to come by,
    uncertain, or conflicting because it is on the frontiers of
    scientific knowledge, EPA need not provide rigorous step-by-
    step proof of cause and effect to support an endangerment
    finding.”) (internal quotation marks omitted). Instead, “[w]hen
    EPA evaluates scientific evidence in its bailiwick, we ask only
    that it take the scientific record into account in a rational
    manner.” 
    Id. at 122
    (internal quotation marks omitted).
    EPA did so here. As explained in the technical support
    document (TSD) accompanying the Final Rule, EPA determined
    that mercury emissions posed a significant threat to public
    health based on an analysis of women of child-bearing age who
    consumed large amounts of freshwater fish. See Mercury TSD;
    NPRM, 76 Fed. Reg. at 25,007; Final Rule, 77 Fed. Reg. at
    38
    9311–17. The design of EPA’s TSD was neither arbitrary nor
    capricious; the study was reviewed by EPA’s independent
    Science Advisory Board, which stated that it “support[ed] the
    overall design of and approach to the risk assessment” and found
    “that it should provide an objective, reasonable, and credible
    determination of the potential for a public health hazard from
    mercury emitted from U.S. EGUs.” SAB Letter to EPA
    Administrator Jackson at 2 (Sept. 29, 2011), EPA-SAB-11-017.
    In addition, EPA revised the final TSD to address SAB’s
    remaining concerns regarding EPA’s data collection practices.
    See Final Rule, 77 Fed. Reg. at 9313–16.4
    Petitioners’ remaining objections center on the change in
    EPA’s position between 2005 and 2012. Although petitioners
    are correct that EPA weighed certain pieces of evidence
    differently at different times, the agency reasonably and
    adequately explained its basis for changing its position on
    whether mercury emissions posed a sufficient risk to constitute
    a public health hazard. See EPA Br. 40; NPRM, 76 Fed. Reg. at
    25,019–20. EPA identified and analyzed what it viewed as
    technical flaws in the scientific analysis supporting the 2005
    Delisting Decision, including a failure to evaluate the
    4
    For the reasons explained in UARG v. EPA, Nos. 12-1166,
    12-1366, 12-1420, 
    2014 WL 928230
    (D.C. Cir. Mar. 11, 2014), we do
    not address petitioners’ claims that SAB’s final report on the Mercury
    TSD was submitted too late to allow public comment and that EPA
    unreasonably refused SAB’s request to review the final TSD.
    Petitioners did not raise those issues in comments, and reconsideration
    is still pending before the agency. Even if these arguments had been
    properly presented to the agency, petitioners would have forfeited
    them by raising them only in a cursory footnote in their opening brief
    before this court. See Hutchins v. Dist. of Columbia, 
    188 F.3d 531
    ,
    539 n.3 (D.C. Cir. 1999) (en banc) (“We need not consider cursory
    arguments made only in a footnote”).
    39
    cumulative health hazard from EGU emissions when combined
    with other sources of mercury, NPRM, 76 Fed. Reg. at 25,019,
    and health hazards from methylmercury exposure above the
    reference dose, 
    id. at 25,020.
    Those explanations are sufficient
    to meet the agency’s burden. See Fox Television 
    Stations, 556 U.S. at 514
    –16.
    2. Major source classification. Petitioners contend that in
    setting emission standards for EGUs, EPA was required to
    distinguish between “major sources” and “area sources.” As
    relevant here, major sources are automatically subject to MACT
    controls, while area sources may, in EPA’s discretion, be
    regulated under alternative standards. See CAA § 112(a)(1),
    112(a)(2), 112(d)(5), 42 U.S.C. § 7412(a)(1), 7412(a)(2),
    7412(d)(5). Petitioners assert that EPA’s failure to segregate the
    different types of sources fatally compromises the Final Rule
    because the EGU emission standards should have been based
    exclusively on data from major source EGUs. But § 112(d) does
    not require EPA to regulate EGUs as “major sources” and “area
    sources”; it merely says that, if EPA lists major and area
    sources, it must then regulate them according to the separate
    provisions. See CAA § 112(d)(1), 42 U.S.C. § 7412(d)(1).
    EPA’s decision not to draw such a distinction here is a
    reasonable one. As EPA emphasizes, distinguishing between
    major source and area source EGUs runs counter to the separate
    statutory provisions governing EGUs. While other sources are
    classified as major or area sources depending on the quantity of
    emissions they emit, § 112 specifically defines EGUs in terms
    of their electrical output. Compare CAA § 112(a)(8), with CAA
    § 112(a)(1)–(2). Consistent with ordinary rules of statutory
    construction, EPA reasonably relied on the more specific
    definition in § 112(a)(8) rather than the general definitions
    applicable to all other sources. See RadLAX Gateway Hotel,
    LLC v. Amalgamated Bank, 
    132 S. Ct. 2065
    , 2070–72 (2012).
    Requiring EPA to classify EGUs as major or area sources would
    40
    also create redundancy in the source-category listing criteria.
    Section 112(c)(3) of the CAA requires EPA to list area sources
    for regulation if EPA determines that they “warrant[]
    regulation.” CAA § 112(c)(3), 42 U.S.C. § 7412(c)(3). That
    finding is arguably unnecessary as applied to EGUs given the
    requirement in § 112(n)(1)(A) that EPA make a finding that
    regulation of all EGUs is “appropriate and necessary.”
    EPA also did not err in declining to exercise its
    discretionary authority to require less stringent “generally
    available control technology,” or GACT, standards, rather than
    MACT standards. 
    Id. § 112(d)(5),
    42 U.S.C. § 7412(d)(5). In
    the Final Rule, EPA expressly and reasonably determined that
    setting separate GACT standards for area source EGUs was
    unnecessary. See Final Rule, 77 Fed. Reg. at 9404, 9438
    (“[S]imilar HAP emissions and control technologies are found
    on both major and area sources” such that “there is no essential
    difference between area source and major source EGUs with
    respect to emissions of HAP.”).
    For these reasons, EPA reasonably declined to interpret
    § 112 as mandating classification of EGUs as major sources and
    area sources.
    3. Mercury MACT floor. Petitioners next challenge EPA’s
    standards for mercury emissions from existing coal-fired EGUs.
    Petitioners maintain that in calculating the MACT floor for
    those units, EPA collected emissions data from only those EGUs
    that were best-performing for mercury emissions.
    Consequently, petitioners insist, the mercury MACT standard
    reflects the results achieved by the “best of the best” EGUs, and
    not the results of the best 12% of all EGUs, as required by
    statute.
    Petitioners’ assertions of a biased or irrational data
    collection process are not supported by a review of the record.
    41
    “EPA typically has wide latitude in determining the extent of
    data-gathering necessary to solve a problem.” Sierra Club v.
    EPA, 
    167 F.3d 658
    , 662 (D.C. Cir. 1999). Here, EPA
    determined that a three-pronged approach was appropriate for
    developing the mercury MACT standard. First, EPA asked all
    EGUs for all of their data from 2005–10; it received data from
    168 units. Information Collection Request (“ICR”) Supporting
    Statement Part A at 9; see generally MACT Floor Analysis
    Spreadsheets. Second, EPA requested and received data from
    50 randomly selected EGUs. ICR Supporting Statement Part B
    at 2, 7–8. Finally, EPA requested and received data from 170 of
    the best-performing units for non-mercury emissions. 
    Id. EPA initially
    thought that third group would also be the best-
    performing for mercury emissions, but it discovered that was not
    the case after examining the data. See Responses to Comments,
    Dec. 2011, v.1, at 573–76 (“RTC”).
    Based on the results of its ICR, covering a total of 388
    EGUs, EPA chose “the average emission limitation achieved by
    the best performing 12 percent” of all existing sources “for
    which [it] ha[d] emissions information,” as authorized by CAA
    § 112(d)(3)(A). See NPRM, 76 Fed. Reg. at 25,022–23.
    Although, as EPA acknowledges, it would be arbitrary and
    capricious for EPA to set a MACT floor based on intentionally
    skewed data, the facts indicate that EPA did not do so here. Nor
    does the record suggest that EPA’s data collection efforts
    resulted in unintentional bias. As previously noted, EPA
    collected data from a wide range of EGUs because the agency
    concluded that it could not identify units representing the best-
    performing 12 percent of mercury emitters. That conclusion is
    borne out by the data in the record, which showed that some of
    the best-performing units for particulate matter control were
    among the worst performing units for mercury control. See
    generally MACT Floor Analysis Spreadsheets. Similarly, many
    of the mercury best performers (32 of the best performing 126
    units) were not drawn from the pool of units that EPA targeted
    42
    as best performers for particulate matter. See RTC v. 1 at 575.
    In short, EPA’s data-collection process was reasonable, even if
    it may not have resulted in a perfect dataset.
    4. Acid gas HAP. EPA did not conclusively determine that
    emissions of acid gases such as hydrogen chloride from EGUs
    pose a health hazard. See NPRM, 76 Fed. Reg. at 25,016 (“our
    case studies did not identify significant chronic non-cancer risks
    from acid gas emissions”). Petitioners say that given that
    conclusion, EPA should have established a less stringent, health-
    based emission standard for acid gases under § 112(d)(4). That
    provision states: “With respect to pollutants for which a health
    threshold has been established, the Administrator may consider
    such threshold level, with an ample margin of safety, when
    establishing emission standards under this subsection.” CAA
    § 112(d)(4), 42 U.S.C. § 7412(d)(4). Section 112(d)(4) makes
    clear, however, that EPA’s authority to set alternate standards is
    discretionary. See 
    id. (“the Administrator
    may consider such
    threshold level”) (emphasis added). Here, EPA concluded that
    it lacked enough evidence to determine whether an alternative
    standard would protect health “with an ample margin of safety.”
    See Final Rule, 77 Fed. Reg. at 9405–06. Petitioners dispute
    EPA’s weighing of the evidence, but petitioners offer no
    compelling basis for second-guessing EPA’s analysis.
    Petitioners also suggest that regulation of EGU acid gas
    emissions to address ecosystem acidification conflicts with
    Congress’s decision in the 1990 CAA amendments to address
    such acidification in Title IV of the CAA. See SIL Reply Br. 5.
    But petitioners failed to raise that argument before the agency,
    and did not raise it in this court until their reply brief. We
    therefore deem the argument forfeited. See Bd. of Regents of
    Univ. of Washington v. EPA, 
    86 F.3d 1214
    , 1221 (D.C. Cir.
    1996).
    43
    5. UARG delisting petition. The Utility Air Regulatory
    Group (UARG) filed a petition with EPA seeking to remove
    coal-fired EGUs from the list of sources regulated under § 112.
    EPA denied the petition. Petitioners now argue that that denial
    was arbitrary and capricious for the same reasons they assert that
    the agency’s determination that it is “appropriate and necessary”
    to regulate EGUs was incorrect. Assuming, without deciding,
    that EPA can delist only a subset of the EGU source category,
    we reject petitioners’ argument on this point. As EPA explained
    in the Final Rule, UARG’s delisting petition did not demonstrate
    that EPA could make either of the two predicate findings
    required for delisting under § 112(c)(9)(B): (1) that no source in
    the category emits HAP “in quantities which may cause a
    lifetime risk of cancer greater than one in one million to the
    individual in the population who is most exposed” and (2) that
    emissions from no source in the category “exceed a level which
    is adequate to protect public health with an ample margin of
    safety.” CAA § 112(c)(9)(B), 42 U.S.C. § 7412(c)(9)(B); see
    also Final Rule, 77 Fed. Reg. at 9364–65 (discussing technical
    flaws in UARG’s risk analysis).
    6. Chromium emissions data. Finally, petitioners question
    the validity of EPA’s case study regarding risks from non-
    mercury EGU emissions. As relevant here, that study found that
    at 6 of 16 tested facilities, emissions of HAP posed a lifetime
    cancer risk of more than one in a million to the most exposed
    individuals. See Final Rule, 77 Fed. Reg. at 9319. Petitioners
    contend that EPA’s cancer-risk finding was the product of
    contaminated emissions samples, and that EPA has refused to
    correct the emissions data it used. In making this argument,
    they rely on their own independent “subsequent resampling” of
    the facilities that EPA examined in conducting its inhalation risk
    assessment.        SIL Br. 52 n.58; UARG, Petition for
    Reconsideration of MATS Rule at 6–7 (Apr. 16, 2012), EPA-
    HQ-OAR-2009-0234-20179 (J.A. 2493–94).
    44
    EPA did not act arbitrarily or capriciously in relying on the
    chromium emissions data to which petitioners object. As EPA
    explained in its responses to comments, the data came from
    source representatives themselves. RTC v.1 at 187. EPA
    reasonably believed that these representatives — given their
    “concern[] about data accuracy” — would review “all data
    before certifying their accuracy and submitting them to the
    EPA.” 
    Id. EPA did
    not err in relying on this certified data. We
    cannot consider the data from petitioners’ independent
    resampling, which was conducted after the Final Rule issued and
    was not part of the administrative record. See CAA
    § 307(d)(7)(A), 42 U.S.C. § 7607(d)(7)(A).
    B.
    A group of electric utilities and industry groups have filed
    a separate petition raising issues specific to industry. Many of
    industry petitioners’ arguments concern circulating fluidized bed
    EGUs, or CFBs. As relevant here, CFBs differ from
    conventional pulverized coal units in that CFBs inject air and
    additional materials, such as limestone, into the combustion
    zone in order to achieve lower-temperature combustion. At that
    lower temperature, fuel breaks down to a lesser degree, thus
    enabling CFBs to control emissions without using add-on
    controls.
    Industry petitioners argue that these design differences
    required EPA to create a separately regulated subcategory for
    CFBs. They emphasize that EPA recognized the need for a CFB
    subcategory in a different rulemaking proceeding, the “Boiler
    MACT” Rule.
    Industry petitioners’ CFB-related arguments are unavailing.
    Contrary to industry petitioners’ assertions, nothing in the Clean
    Air Act “requires” EPA to create a CFB subcategory. Rather,
    the statute gives EPA substantial discretion in determining
    whether subcategorization is appropriate. See CAA § 112(d)(1),
    45
    42 U.S.C. § 7412(d)(1) (EPA “may distinguish among classes,
    types, and sizes of sources”) (emphasis added); see also Nat’l
    Ass’n of Clean Water Agencies v. EPA, 
    734 F.3d 1115
    , 1159
    (D.C. Cir. 2013) (“EPA’s subcategorization authority under
    § 112 involves an expert determination, placing a heavy burden
    on a challenger to overcome deference to EPA’s articulated
    rational connection between the facts found and the choice
    made.”) (internal quotation marks omitted). EPA’s decision not
    to create a CFB subcategory in the Final Rule is reasonable and
    well-supported by the record. Among other things, EPA noted
    that CFBs were among the best and worst performers for various
    pollutants, indicating that CFBs have emissions profiles similar
    to other coal-fired units despite their operational differences.
    See Final Rule, 77 Fed. Reg. at 9397.
    The record similarly supports EPA’s determination that the
    0.002 lb/MMBtu hydrogen chloride limit for CFBs is
    achievable. As noted above, some CFB units were among the
    top performers for each of the regulated pollutants, including
    hydrogen chloride. See 
    id. The record
    thus demonstrates that at
    least some CFB units are in fact able to achieve the hydrogen
    chloride limit. In any event, the fact that the Final Rule may not
    be cost effective for all CFBs does not necessarily mean EPA
    erred in declining to create a CFB subcategory or in setting
    emission standards applicable to those units.
    EPA’s decision to subcategorize CFBs in the Boiler MACT
    Rule is not to the contrary. There, EPA concluded that CFBs
    presented relevant differences with respect to carbon monoxide
    — not mercury, acid gases, or particulates (the pollutants at
    issue in this rulemaking). See National Emission Standards for
    Hazardous Air Pollutants for Major Sources: Industrial,
    Commercial, and Institutional Boilers and Process Heaters, 76
    Fed. Reg. 15,608, 15,617–18 (Mar. 21, 2011).
    46
    Industry petitioners further argue that at a minimum, EPA
    should have set separate acid gas standards for coal-refuse-fired
    CFBs. Those units burn waste coal from other coal-mining
    operations and use the resulting ashes in mine reclamation
    projects. Industry petitioners maintain that these fuel-ash reuse
    efforts would be imperiled by the stringency of the acid gas
    standards in the Final Rule.
    We conclude that EPA reasonably decided that separate
    standards for coal-refuse-fired CFBs were not warranted.
    Industry petitioners’ assertion that the hydrogen chloride
    standards are unattainable for coal-refuse-fired CFBs is
    undermined by the fact that some of those units were among the
    best performers for hydrogen chloride. See RTC v.1 at 587.
    EPA also suggested alternative compliance methods that it says
    would permit coal-refuse-fired CFBs to continue participating
    in reclamation efforts. See Final Rule, 77 Fed. Reg. at 9412.
    Regardless, nothing in the CAA obligates EPA to set standards
    in a way that always allows the re-use of fuel ash, even if doing
    so might be a more desirable outcome for some EGU operators.
    C.
    In contrast to its decision on CFBs, EPA did create a
    subcategory for lignite-fired EGUs. (Lignite coal is also
    referred to as “low rank” coal due to its low heat content.)
    Industry petitioners argue that the emission standard for the
    lignite subcategory is based on an improperly calculated
    minimum stringency level, or MACT floor. Industry petitioners
    also contend that the emission standard set by EPA is not
    achievable. We consider these arguments in turn.
    1. MACT floor. Industry petitioners insist that EPA
    incorrectly calculated the MACT floor for lignite units,
    rendering that standard arbitrary and capricious. They assert
    that EPA used “cherry picked” data from the top 6% of units,
    instead of the top 12% as required by § 112(d)(3)(A). Finally,
    47
    industry petitioners argue that EPA did not properly account for
    variability in lignite coal.
    Industry petitioners’ data-bias argument is similar to the
    argument made by the State, Industry & Labor petitioners
    regarding the mercury MACT 
    floor, supra
    Part III.A.3. And, as
    with that argument, petitioners’ assertions regarding the lignite
    MACT floor find no support in the record. EPA has offered a
    reasonable, non-biased explanation of its data-collection and
    analysis process. See MACT Floor Memo at 10; RTC v.1 at
    559–60.
    Industry petitioners’ objections regarding the variability of
    lignite coal likewise fail. EPA accounted for variability due to
    differing chemical compositions of coal by applying its Upper
    Prediction Limit analysis. See NPRM, 76 Fed. Reg. at 25,041.
    Industry petitioners do not challenge that analysis itself. They
    do suggest in passing that EPA’s results are flawed, see Industry
    Pet’rs’ Br. 10, but offer no explanation as to why that is so.
    Such cursory treatment is inadequate to place their challenge to
    EPA’s variability analysis before the court, because “it is not
    enough merely to mention a possible argument in the most
    skeletal way, leaving the court to do counsel’s work, create the
    ossature for the argument, and put flesh on its bones.” Davis v.
    Pension Benefit Guar. Corp., 
    734 F.3d 1161
    , 1166–67 (D.C. Cir.
    2013) (internal quotation marks and alterations omitted). While
    EPA acknowledged that it could not account for all operational
    variability, it concluded that its variability analysis “is an
    appropriate method of addressing the concern that these
    standards must be met at all times.” RTC v.1 at 458. EPA’s
    explanation is sufficient to withstand our “extremely
    deferential” review of this kind of technical judgment. New
    York v. Reilly, 
    969 F.2d 1147
    , 1152 (D.C. Cir. 1992).
    2. Beyond-the-floor limit. EPA is permitted to set a more
    restrictive, “beyond-the-floor” emission standard if the agency
    48
    determines that such a standard is “achievable” considering
    costs, energy requirements, and applicable control technologies.
    CAA § 112(d)(2), 42 U.S.C. § 7412(d)(2). To be “achievable,”
    a standard “must be capable of being met under most adverse
    conditions which can reasonably be expected to recur.” Nat’l
    Lime Ass’n v. EPA, 
    627 F.2d 416
    , 431 n.46 (D.C. Cir. 1980). In
    this case, industry petitioners argue that EPA failed to consider
    the limitations of applicable control technologies. As a result,
    petitioners contend, EPA’s beyond-the-floor standard for lignite-
    fired EGUs is not achievable because the standard mandates
    unrealistically high levels of mercury reduction.
    We reject petitioners’ challenge to the beyond-the-floor
    standard. EPA concluded during the rulemaking process that the
    standard for lignite units is achievable if sources increase their
    use of a particular control technology, activated carbon
    injection. See Beyond-the-Floor Memo at 1–4. According to
    EPA, increased carbon injection can reduce emissions by up to
    90%, well in excess of the reductions necessary to reach
    beyond-the-floor levels. 
    Id. at 1–2.
    Ultimately, the dispute on
    this issue amounts to a factual disagreement between EPA and
    petitioners over the effectiveness of activated carbon injection.
    Because the record contains no data inconsistent with EPA’s
    position on the efficacy of activated carbon injection, we defer
    to the agency’s determination that the beyond-the-floor emission
    standard for lignite-fired EGUs is achievable.
    D.
    Public utility companies are subject to certain state-law
    contracting requirements that may lengthen the process of
    installing upgraded controls. That added time, industry
    petitioners argue, requires EPA to grant a blanket, one-year
    extension of the compliance deadline to public power
    companies. We disagree. Once again, petitioners’ argument
    amounts to a claim that a decision the Clean Air Act leaves to
    EPA’s discretion should instead be mandatory. See CAA
    49
    § 112(i)(3)(B), 42 U.S.C. § 7412(i)(3)(B) (EPA “may issue” an
    extension under certain circumstances). EPA explained at
    length why such a blanket extension was inappropriate. See
    Final Rule, 77 Fed. Reg. at 9407, 9409–11. Most importantly,
    industry petitioners did not show — and likely could not show
    — that an extension is necessary for the installation of controls
    at every public power company. On the contrary, EPA’s data
    indicated that “most units will be able to fully comply” within
    the three-year period established by EPA. Final Rule, 77 Fed.
    Reg. at 9410. EPA’s decision not to issue a blanket extension
    therefore was not arbitrary or capricious.5
    IV.
    We turn to the challenges by Environmental petitioners and
    Julander Energy Company.
    A.
    Environmental petitioners challenge the provisions of the
    Final Rule that allow compliance with emission standards to be
    demonstrated through (1) emissions averaging and (2) options
    for non-mercury metal HAP emissions monitoring. Chesapeake
    Climate Action Network, Conservation Law Foundation,
    Environmental Integrity Project, and Sierra Club object to
    5
    To the extent that petitioners object to EPA’s alleged failure
    to respond to comments on this issue made by public power
    companies on the ground that this failure violates CAA
    § 307(d)(6)(B), 42 U.S.C. § 7607(d)(6)(B), we do not address that
    objection because it was first raised in a pending petition for
    reconsideration. See UARG, 
    2014 WL 928230
    , at *4. We also do not
    address industry petitioners’ arguments concerning the standards for
    petroleum-coke-fired EGUs and liquid oil-fired non-continental EGUs
    because those arguments were likewise first raised in a pending
    petition for reconsideration.
    50
    averaging as unlawful; Chesapeake Climate Action Network and
    Environmental Integrity Project object to the monitoring options
    as failing to provide reasonable assurance of compliance. They
    presented their objections (save one) during the comment period
    and EPA has responded to them. Although the challenges to
    emissions averaging are also pending before EPA in a petition
    for reconsideration, and usually would be incurably premature,
    see, e.g., Clifton Power Corp. v. FERC, 
    294 F.3d 108
    , 112 (D.C.
    Cir. 2002), the text and legislative history of the Clean Air Act
    make clear this usual approach is inapplicable, see UARG v.
    EPA, Nos. 12-1166, 12-1366, 12-1420, 
    2014 WL 928230
    , at *3
    (D.C. Cir. Mar. 11, 2014); CAA § 307(b)(1), 42 U.S.C.
    § 7607(b)(1); S. REP. NO. 101-228, at 3755 (1989).
    1. Averaging. Under the Final Rule, existing contiguous,
    commonly-controlled EGUs in the same subcategory can
    demonstrate compliance by averaging their emissions as an
    alternative to meeting certain requirements on an individual
    basis. Final Rule, 77 Fed. Reg. at 9384, 9473–76 (codified at 40
    C.F.R. § 63.10009). Averaging is permissible only between the
    same types of pollutants, individual EGUs that are part of the
    same affected source, EGUs subject to the same emission
    standard, and existing (not new) EGUs. 
    Id. at 9385.
    Each
    facility intending to use emissions averaging must develop an
    emissions averaging plan identifying “(1) [a]ll units in the
    averaging group; (2) the control technology installed; (3) the
    process parameter that will be monitored; (4) the specific control
    technology or pollution prevention measure to be used; (5) the
    test plan for the measurement of the HAP being averaged; and
    (6) the operating parameters to be monitored.” 
    Id. at 9385–86.
    Environmental petitioners contend the averaging alternative
    is unlawful because it relaxes the stringency of the MACT floor
    standards. With one exception, EPA set the MACT floor
    standards based on a thirty-boiler operating day averaging
    51
    period. 
    Id. at 9385,
    9479–80. Allowing multiple EGUs to
    average their emissions data effectively extends, petitioners
    maintain, the standards’ averaging period to sixty days (for two
    units), ninety days (for three units), or more. In their view, a
    longer averaging period permits longer and larger pollution
    spikes because high measurements can be averaged over more
    hours of normal, lower-pollution operations.
    Section 112(d)(3), 42 U.S.C. § 7412(d)(3), provides that
    emission standards for existing sources “shall not be less
    stringent” than “the average emission limitation achieved by the
    best performing 12 percent” of such sources. The subsection
    (d)(2) “beyond-the-floor” requirement provides that emission
    standards for new or existing sources “shall require the
    maximum degree of reduction in emissions of the hazardous air
    pollutants subject to this section . . . that the Administrator . . .
    determines is achievable.” CAA § 112(d)(2), 42 U.S.C.
    § 7412(d)(2).
    EPA permissibly interpreted § 112(d) to allow emissions
    averaging as provided for in the Final Rule. See 
    Chevron, 467 U.S. at 843
    . That section neither expressly allows nor disallows
    emissions averaging among multiple units. In the Final Rule,
    EPA stated:
    Averaging across affected units is permitted only if it
    can be demonstrated that the total quantity of any
    particular HAP that may be emitted by that portion of
    a contiguous major source that is subject to the same
    standards in the [Final Rule] will not be greater under
    the averaging mechanism than it could be if each
    individual affected EGU in the subcategory complied
    separately with the applicable standard. Under this
    test, the practical outcome of averaging is equivalent to
    compliance with the MACT floor limits by each
    52
    discrete EGU, and the statutory requirement that the
    MACT standard reflect the maximum achievable
    emissions reductions is, therefore, fully effectuated.
    77 Fed. Reg. at 9385. Viewing averaging as “an equivalent,
    more flexible, and less costly alternative” to requiring units to
    demonstrate compliance individually, EPA explained that
    permitting averaging is part of its “general policy of
    encouraging the use of flexible compliance approaches where
    they can be properly monitored and enforced.” 
    Id. Environmental petitioners
    concede the averaging alternative
    will not result in an increase in a source’s total emissions
    beyond the level permitted under the applicable standard, see
    Envtl. Pet’rs’ Br. 18, and while theoretically averaging could
    allow an individual unit’s emissions to exceed the standard,
    under the Final Rule that exceedance must be offset by other,
    better-performing units to demonstrate compliance. They have
    not challenged EPA’s interpretation of the ambiguous term
    “source,” which EPA defined as referring to “the collection of
    coal- or oil-fired EGUs . . . within a single contiguous area and
    under common control,” Final Rule, 77 Fed. Reg. at 9366, rather
    than a single EGU. Because § 112(d)(3), 42 U.S.C.
    § 7412(d)(3), requires EPA to prescribe emissions limitations
    for “sources,” not units, EPA could permissibly establish a
    standard that allows averaging within a single source. Cf.
    
    Chevron, 467 U.S. at 866
    . Although this may allow individual
    units to exceed the emissions limitation, the statute does not
    require EPA to regulate emissions on a unit level.
    As EPA has observed, Environmental petitioners’ main
    objection appears to be that the Final Rule does not include a
    “discount factor” whereby emission rates are reduced for
    sources using an averaging alternative. Petitioners point, for
    example, to the discount factor included in the Hazardous
    53
    Organic NESHAP rule, Envtl. Pet’rs’ Br. 9–10, in which EPA
    determined that “to carry out the mandate of section 112(d)(2),
    some portion of these cost savings [from averaging] should be
    shared with the environment by requiring sources using
    averaging to achieve more emission reductions than they would
    otherwise.”6
    To the extent petitioners’ objection is that EPA failed to
    explain why it did not include a discount factor, EPA, in fact,
    offered a reasonable and adequate explanation. In the Final
    Rule, EPA explained that “[g]iven the homogeneity of fuels
    within the rules subcategories, along with other emissions
    averaging criteria, the Agency believes use of a discount factor
    to be unwarranted for this rule.” Final Rule, 77 Fed. Reg. at
    9386. Further, in responding to comments, EPA explained that
    unlike the Hazardous Organic rule, “which covers a broad
    number of unit types, products, and processes,” EGUs subject to
    the Final Rule “differ generally only in the fuel used to produce
    electricity,” a difference, EPA concluded, “accounted for . . . by
    prohibiting units from differing subcategories — which are fuel
    based — from participating in emissions averaging.” RTC v.2
    at 361–62. EPA noted as well its agreement that “other safety
    factors in the rule obviate the need for a discount factor,” 
    id. at 363,
    including the requirement averaging start within three years
    of promulgation of the Final Rule.
    The suggestion by Environmental petitioners that EPA
    improperly relied on its Upper Prediction Limit (“UPL”)
    6
    National Emission Standards for Hazardous Air Pollutants
    for Source Categories; Organic Hazardous Air Pollutants from the
    Synthetic Organic Chemical Manufacturing Industry and Other
    Processes Subject to the Negotiated Regulation for Equipment Leaks,
    59 Fed. Reg. 19,402, 19,430 (Apr. 22, 1994).
    54
    analysis to mitigate the effect of averaging on the stringency of
    emission standards fares no better. The UPL analysis in the
    MACT floor calculation is designed to “assess variability of the
    best performers.” NPRM, 76 Fed. Reg. at 25,041. To the extent
    petitioners point to EPA’s statement in responding to comments,
    they ignore its context. EPA stated that it “disagrees with the
    suggestion that another variability component need be
    considered for those EGU owners or operators who choose to
    engage in emissions averaging; the current UPL analyses was
    [sic] developed to take factors such as those mentioned by the
    commenter into account.” RTC v.2 at 363. According to
    Environmental petitioners, “the UPL analyses contain nothing
    that would eliminate (or even mitigate) the Averaging
    Alternative’s additional relaxation of the standards,” and it was
    therefore inappropriate for EPA to rely on this analysis in
    support of the Final Rule’s emissions averaging provisions.
    Envtl. Pet’rs’ Br. 20. But there is nothing to indicate this is what
    EPA did. In its statement, EPA was responding to industry
    comments arguing that because EPA had accounted for
    individual-unit variability in the UPL analysis in setting MACT
    floors, it was inappropriate to allow a multi-unit facility to
    further reduce variability by averaging, without applying a
    discount factor. It is far too great a stretch to read EPA’s
    response as an admission that EPA relied on its UPL analysis to
    support emissions averaging.
    2. Monitoring. The Final Rule provides three alternatives
    to continuous emissions monitoring to demonstrate compliance
    with the non-mercury metal HAP standards. They are: (1) use
    of a continuous parametric monitoring system (“CPMS”), (2)
    quarterly performance testing, and (3) performance testing once
    every three years for qualifying low emitting EGUs. See Final
    Rule, 77 Fed. Reg. at 9466 (codified at 40 C.F.R.
    § 63.10000(c)(1)(iii-iv)). Environmental petitioners first
    challenged CPMS in a pending petition for reconsideration, and
    55
    therefore that challenge is not properly before the court for
    decision now. See UARG, 
    2014 WL 928230
    , at *4, *5 n.4.
    Any EGU may demonstrate compliance with the non-
    mercury metal standards through quarterly performance tests.
    Final Rule, 77 Fed. Reg. at 9372, 9384, 9466. If a unit’s
    emission results for all required tests are less than 50 percent of
    the applicable emission limit for a three-year period, the EGU
    may qualify as a low emitting EGU for non-mercury metal
    HAPs and is then required to conduct performance testing only
    once every three years, so long as it maintains compliance. 
    Id. at 9371,
    9466, 9471.
    Environmental petitioners maintain that stack testing
    conducted quarterly or once every three years cannot provide
    reasonable assurance of compliance with a standard set as a
    thirty-day emissions rate, given EPA’s determination that stack
    test results are highly variable, and that EPA has failed to
    explain how compliance options involving long intervals
    between performance tests and lacking any control of operating
    conditions between tests can provide sufficiently timely or
    reliable information to assure compliance. EPA has provided a
    reasonable explanation for its determination that each of these
    monitoring options complies with the statutory requirements of
    CAA §§ 114 and 504.
    Section 504(b), 42 U.S.C. § 7661c(b), provides that
    “continuous emissions monitoring need not be required if
    alternative methods are available that provide sufficiently
    reliable and timely information for determining compliance.”
    Although § 114(a)(3), 42 U.S.C. § 7414(a)(3), “require[s]
    enhanced monitoring” for major stationary sources, there is “no
    presumption in favor of any particular type of monitoring.”
    Sierra 
    Club, 353 F.3d at 991
    . EPA has “broad discretion in
    selecting a monitoring regime that ensures compliance,” and as
    56
    long as it “reasonably articulate[s] the basis for its decision,” 
    id., the court
    will “defer to the informed discretion of the Agency,”
    recognizing that “analysis of this issue requires a high level of
    expertise,” 
    id. (quoting Nat’l
    Lime, 233 F.3d at 635
    ).
    EPA explained that, in its judgment, “[t]he quarterly stack
    testing period, coupled with underlying monitoring of control
    devices or the additional monitoring for liquid oil-fired units, is
    expected to be frequent enough to ensure that a unit’s emissions
    control devices and processes continue to operate in the same
    manner as during the previous stack test.” RTC v.2 at 93. “If
    there are significant changes to the operation of the unit or the
    fuel, then a retest is required to reconfirm that the source
    remains in compliance under the new operating circumstances.”
    
    Id. EPA acknowledged,
    with respect to the low emitting EGU
    option, that the available data “shows an EGU’s potential
    variability,” but reasoned that “well-operated EGUs — such as
    those qualifying for [low emitting EGU] status — are expected
    to have much less variable emissions” and that “the requirement
    to revert to the original monitoring frequency should subsequent
    emissions testing show the EGUs no longer meet [low emitting
    EGU] status will keep source owners or operators interested in
    maintaining [that] status.” 
    Id. at 244.
    EPA has provided a
    reasonable explanation for its determinations that these two
    monitoring options provide sufficient assurance of compliance
    with the applicable emission standards.
    B.
    Julander Energy Company, an oil and natural gas
    development, exploration, and production company, challenges
    EPA’s decision not to adopt stricter emission standards by
    requiring “fuel switching” by EGUs from coal to natural gas. It
    contends that EPA unlawfully relied on a non-statutory factor
    (prohibition of construction of new coal-fired EGUs), failed to
    consider a required statutory factor (§ 112’s requirement that
    57
    EPA consider collateral benefits of control options), and reached
    arbitrary and capricious conclusions about natural gas supply
    and infrastructure and costs.
    As a threshold matter, the court must address Julander’s
    standing. Industry intervenor-respondents contend Julander
    lacks standing under Article III of the Constitution. In fact,
    Julander’s “injury in fact,” causation, and redressability under
    Article III, see Lujan v. Defenders of Wildlife, 
    504 U.S. 555
    ,
    560–61 (1992), are self-evident, see Sierra Club v. EPA, 
    292 F.3d 895
    , 899–900 (D.C. Cir. 2002), insofar as the Final Rule
    does not require EGUs to switch to natural gas, to the detriment
    of Julander’s stated interests, and on remand EPA could require
    fuel switching. EPA, however, contends Julander lacks
    “prudential standing” because its interests do not come within
    the zone-of-interests test articulated in Association of Data
    Processing Service Organizations, Inc. v. Camp, 
    397 U.S. 150
    (1970). The Supreme Court recently clarified that “‘prudential
    standing is a misnomer’ as applied to the zone-of-interests
    analysis,” Lexmark Int’l, Inc. v. Static Control Components,
    Inc., No. 12-873, 
    2014 WL 1168967
    , at *6 (U.S. Mar. 25, 2014)
    (quoting Ass’n of Battery Recyclers, Inc. v. EPA, 
    716 F.3d 667
    ,
    675–76 (D.C. Cir. 2013) (Silberman, J., concurring)). The
    question remains whether Julander’s interest is “arguably within
    the zone of interests to be protected or regulated by the statute.”
    Match-E-Be-Nash-She-Wish Band of Pottawatomi Indians v.
    Patchak, 
    132 S. Ct. 2199
    , 2210 (2012) (quoting Ass’n of Data
    
    Processing, 397 U.S. at 153
    ).
    Although the zone-of-interests test “is not meant to be
    especially demanding,” Clarke v. Secs. Indus. Ass’n, 
    479 U.S. 388
    , 399 (1987), we conclude that Julander falls outside the
    zone of interests protected by § 112 of the CAA.
    Notwithstanding our concurring colleague’s suggestion, this
    conclusion is not the result of a “coin flip” to decide which of
    58
    our precedents to follow. Concurring Op. at 17, 29. The
    Supreme Court has instructed that “the breadth of the zone of
    interests varies according to the provisions of law at issue.”
    Lexmark, 
    2014 WL 1168967
    , at *8 (citation omitted).
    Accordingly, this court must be guided by those of our
    precedents that have interpreted § 112, and not those applying
    other statutory provisions, including the APA. Those cases hold
    in the context of challenges to emission standards that
    competitors of regulated parties fall outside the zone of interests
    protected by § 112.
    In Association of Battery 
    Recyclers, 716 F.3d at 674
    , the
    court held that a corporation could not challenge EPA’s failure
    to impose more stringent emission standards on its competitors
    because that interest fell outside the zone of interests protected
    by § 112. In Cement Kiln Recycling Coalition v. EPA, 
    255 F.3d 855
    , 871 (D.C. Cir. 2001), the court similarly held that the
    purely commercial interests of manufacturers of pollution
    control equipment seeking more rigorous regulation of their
    competitors under § 112 were not within the zone of interests
    that Congress intended to be relied upon to challenge EPA’s
    claimed disregard of the CAA. This was so even though their
    pecuniary interests in increasing demand for their products were
    aligned with the goals of the CAA. The court explained that
    Congress’s evident purpose in enacting the CAA was not to
    compel those sources with less-than-best pollution control to
    invest in upgraded equipment, but only to meet the standards, as
    distinct from adopting the methods of emission control, of the
    best performing sources. 
    Id. This court
    has not read the
    Supreme Court’s decision in Match-E-Be-Nash-She-Wish Band
    of Pottawatomi Indians, 
    132 S. Ct. 2199
    , to change the zone-of-
    interests standard, and the court is bound to follow its own
    precedent. See Grocery Mfrs. Ass’n v. EPA, 
    693 F.3d 169
    , 179
    (D.C. Cir. 2012); 
    id. at 180
    (Tatel, J., concurring).
    59
    Julander disputes that it is seeking a competitive advantage
    by increasing the regulatory burden on its competitors, pointing
    out that as an oil and natural gas development company it is not
    a direct competitor of the regulated coal- and oil-fired EGUs. It
    maintains that it is properly characterized as a vendor to, and not
    a competitor of, the regulated entities. Nonetheless, the
    reasoning of our binding precedent encompasses Julander’s
    situation. As the court observed in Hazardous Waste Treatment
    Council v. EPA, 
    861 F.2d 277
    , 282 (D.C. Cir. 1988), where the
    Treatment Council, much like Julander, claimed its interests,
    although pecuniary, were “in sync” with those sought to be
    served by the Resource Conservation and Recovery Act, the
    Supreme Court’s standard in Clarke “leaves the status of this
    sort of incidental benefit somewhat unclear.” In “find[ing]
    operational meaning for a test that demands less than a showing
    of congressional intent to benefit but more than a ‘marginal[]
    rela[tionship]’ to the statutory purposes,” 
    id. at 283
    (quoting
    
    Clarke, 479 U.S. at 399
    ), this court acknowledged that even
    absent an apparent congressional intent to benefit there may still
    be “some indicator that the plaintiff is a peculiarly suitable
    challenger of administrative neglect [to] support[] an inference
    that Congress would have intended eligibility,” 
    id. But the
    court
    rejected the notion that the petitioner’s “in sync” interests were
    more than “marginally related” to Congress’s environmental
    purposes. 
    Id. Whenever Congress
    pursues some goal, it is inevitable
    that firms capable of advancing that goal may benefit.
    If Congress authorized bank regulators to mandate
    physical security measures for banks, for example, a
    shoal of security services firms might enjoy a profit
    potential — detective and guard agencies,
    manufacturers of safes, detection devices and small
    arms, experts on entrance control, etc. But in the
    absence of either some explicit evidence of an intent to
    60
    benefit such firms, or some reason to believe that such
    firms would be unusually suitable champions of
    Congress’s ultimate goals, no one would suppose them
    to have standing to attack regulatory laxity. And of
    course a rule that gave any such plaintiff standing
    merely because it happened to be disadvantaged by a
    particular agency decision would destroy the
    requirement of prudential standing; any party with
    constitutional standing could sue.
    
    Id. (emphasis added).
    In Cement 
    Kiln, 255 F.3d at 871
    , the court
    embraced this analysis as no less applicable to the CAA. The
    court has further observed that “judicial intervention may defeat
    statutory goals if it proceeds at the behest of interests that
    coincide only accidentally with those goals,” Hazardous 
    Waste, 861 F.2d at 283
    , and that “open-ended emissions standards” are
    particularly susceptible to such “manipulation,” Honeywell Int’l
    Inc. v. EPA, 
    374 F.3d 1363
    , 1371 (D.C. Cir. 2004).
    Ethyl Corp. v. EPA, 
    306 F.3d 1144
    (D.C. Cir. 2002), is of
    no aid to Julander. In that case, the court held that a
    manufacturer of fuel additives seeking information (through an
    open process for testing emissions control systems) in order to
    comply with its own regulatory obligations fell within the zone
    of interests protected or regulated by the CAA. See 
    id. at 1148.
    Ethyl had an interest that “appear[ed] congruent with those of
    the [CAA], i.e., the development of products that will reduce
    harmful air pollutants,” 
    id., without the
    potential for distortion
    of the regulatory process of concern to the court in Hazardous
    
    Waste, 861 F.2d at 285
    , and Cement 
    Kiln, 255 F.3d at 871
    .
    Unlike petitioners seeking to increase the regulatory burden on
    others in order to advance their own commercial interests, Ethyl
    sought access to information to “improve its products with an
    eye to conformity to emissions needs” and to “secur[e] EPA
    approval for its own fuel additive products under the [Clean Air]
    61
    Act.” Ethyl 
    Corp., 306 F.3d at 1147
    –48. The court emphasized
    “the interdependence between motor vehicle certification under
    the Act (the process at stake here) and fuel regulations (under
    which Ethyl is a direct regulatee).” 
    Id. at 1148.
    Julander, in
    contrast, seeks stricter regulation of coal- and oil-fired EGUs,
    not information that would enable it to comply with its own
    regulatory obligations.
    Julander’s suggestion that its interests are properly
    characterized as those of a vendor, not a competitor, is
    unavailing. It cannot rely on its existing relationship with
    natural gas-fired EGUs because they are not subject to the Final
    Rule, 77 Fed. Reg. at 9309. And claiming that it has standing as
    a potential vendor to coal- and oil-fired EGUs, in the event they
    were forced to switch to natural gas, is at odds with the
    reasoning underlying the vendor-vendee line of cases. A vendor
    has standing “to assert the interest of [regulated] vendees.”
    Nat’l Cottonseed Products Ass’n v. Brock, 
    825 F.2d 482
    , 490
    (D.C. Cir. 1987) (citing FAIC Secs., Inc. v. United States, 
    768 F.2d 352
    , 360–61 (D.C. Cir. 1985)). Julander is not standing in
    for the interests of its potential vendees, which, in fact, here
    challenge Julander’s petition. Consequently, the interests of
    Julander and the regulated industry petitioners are not “two sides
    of the same coin.” FAIC 
    Secs., 768 F.2d at 359
    .
    Julander had the opportunity to submit its views on fuel
    switching to EPA during the rulemaking proceedings. And it
    did. See Julander Comments Aug. 4, 2011. It could also have
    sought permission to appear as amicus in this court, which it did
    not. Absent any reason to conclude that it is an “unusually
    suitable champion[]” of Congress’ goals in the CAA, we hold,
    consistent with this court’s precedent, that Julander’s interest in
    increasing the regulatory burden on others falls outside the zone
    of interests protected by the CAA and therefore Julander may
    not proceed as a petitioner in this court.
    KAVANAUGH, Circuit Judge, concurring in part and
    dissenting in part: Suppose you were the EPA Administrator.
    You have to decide whether to go forward with a proposed air
    quality regulation. Your only statutory direction is to decide
    whether it is “appropriate” to go forward with the regulation.
    Before making that decision, what information would you
    want to know? You would certainly want to understand the
    benefits from the regulations. And you would surely ask how
    much the regulations would cost. You would no doubt take
    both of those considerations – benefits and costs – into
    account in making your decision. That’s just common sense
    and sound government practice.
    So it comes as a surprise in this case that EPA excluded
    any consideration of costs when deciding whether it is
    “appropriate” – the key statutory term – to impose significant
    new air quality regulations on the Nation’s electric utilities.
    In my view, it is unreasonable for EPA to exclude
    consideration of costs in determining whether it is
    “appropriate” to impose significant new regulations on
    electric utilities. To be sure, EPA could conclude that the
    benefits outweigh the costs. But the problem here is that EPA
    did not even consider the costs. And the costs are huge, about
    $9.6 billion a year – that’s billion with a b – by EPA’s own
    calculation.
    In Part I of this opinion, I explain my respectful
    disagreement with the majority opinion’s decision to uphold
    EPA’s exclusion of cost from its decisionmaking under this
    statutory provision.
    In Part II of this opinion, I write to address this Court’s
    case law applying the “zone of interests” test under the
    Administrative Procedure Act.          I accept the majority
    opinion’s conclusion that petitioner Julander Energy
    Corporation – a natural gas company challenging EPA’s
    allegedly unlawful under-regulation of Julander’s competitor
    2
    coal and oil companies – does not fall within the “zone of
    interests” of the Clean Air Act, at least as the zone of interests
    test has been applied by some decisions of this Court. But
    those decisions are inconsistent with other decisions of this
    Court and, more importantly, are incompatible with a 40-year
    string of Supreme Court decisions applying the “zone of
    interests” test. Put simply, our case law applying the zone of
    interests test is in a state of disorder and needs to be cleaned
    up in the near future.
    I
    These consolidated cases concern EPA’s Final Rule,
    “National Emission Standards for Hazardous Air Pollutants
    From Coal- and Oil-Fired Electric Utility Steam Generating
    Units,” 77 Fed. Reg. 9304 (Feb. 16, 2012). The Rule
    implements provisions of the Clean Air Act, 42 U.S.C. § 7401
    et seq., regarding emissions of hazardous air pollutants.
    As the majority opinion recounts, the Clean Air Act
    originally provided EPA substantial discretion to identify and
    regulate pollution from sources emitting hazardous air
    pollutants. That approach proved to be time-consuming and
    largely unworkable, so in 1990 Congress amended the Act to
    cabin much of EPA’s discretion. The 1990 amendments
    required EPA to identify stationary sources of 189
    enumerated hazardous air pollutants and to adopt standards
    for limiting emissions of those pollutants from those sources.
    See 42 U.S.C. § 7412.1 Those technology-based standards are
    1
    Six other common pollutants emitted by stationary sources
    are regulated under a different section of the Clean Air Act. The
    National Ambient Air Quality Standards, or NAAQS, prescribe the
    maximum permissible levels of those six pollutants in the ambient
    air. See 42 U.S.C. § 7409(a)-(b). Under that NAAQS program,
    EPA must choose levels for emissions of those pollutants which,
    3
    commonly referred to as the “maximum achievable control
    technology,” or MACT, standards.
    EPA uses a two-step process for setting MACT
    standards. It begins by setting a minimum stringency level, or
    “floor,” based on the performance of the best-performing
    units in a particular source category. See 
    id. § 7412(d)(3).
    At
    that first step, EPA may not consider costs. Once the agency
    sets the statutory floor, it then determines, considering cost
    and the other factors listed in Section 112(d)(2), whether an
    even more restrictive standard is “achievable.” 
    Id. § 7412(d)(2).
    EPA refers to these stricter requirements as
    “beyond-the-floor” standards.
    The two-step process outlined in Section 112(d) – what I
    will call the MACT program – applies automatically to most
    sources of hazardous air pollutants.
    But for one category of sources – electric utilities –
    Congress devised an alternative system as set forth in Section
    112(n)(1)(A) of the Act.2 That alternative system erects two
    threshold hurdles before EPA may regulate electric utilities
    under the MACT program. First, Congress required EPA to
    “perform a study of the hazards to public health reasonably
    anticipated to occur as a result of emissions by” electric
    utilities and report the results of the study to Congress within
    three years of the enactment of the amendments. 
    Id. § 7412(n)(1)(A).
    Second, Congress provided that after the
    study was completed, EPA could regulate electric utilities
    under the MACT program only “if the Administrator finds
    “allowing an adequate margin of safety, are requisite to protect the
    public health.” 
    Id. § 7409(b)(1).
         2
    The electric utilities included in this alternative system are
    coal- and oil-fired electric utility steam generating units.
    4
    such regulation is appropriate and necessary after considering
    the results of the study.” 
    Id. (emphasis added).
    3
    The meaning of Section 112(n)(1)(A) – particularly the
    term “appropriate” – is a critical question in this litigation.
    Industry petitioners and EPA dispute whether EPA, when
    determining whether regulation of electric utilities under the
    MACT program is “appropriate,” must consider the cost to
    industry and the public from regulating electric utilities under
    that program.4
    EPA thinks not. EPA acknowledges that, in the past, it
    has interpreted and applied the word “appropriate” in this
    statute to provide for the consideration of costs. See 70 Fed.
    Reg. 15,994, 16,001 & n.19 (Mar. 29, 2005). But the agency
    has changed its interpretation. EPA’s position now is that
    3
    In full, the relevant section of the statute reads: “The
    Administrator shall perform a study of the hazards to public health
    reasonably anticipated to occur as a result of emissions by electric
    utility steam generating units of pollutants listed under subsection
    (b) of this section after imposition of the requirements of this
    chapter. The Administrator shall report the results of this study to
    the Congress within 3 years after November 15, 1990. The
    Administrator shall develop and describe in the Administrator’s
    report to Congress alternative control strategies for emissions which
    may warrant regulation under this section. The Administrator shall
    regulate electric utility steam generating units under this section, if
    the Administrator finds such regulation is appropriate and necessary
    after considering the results of the study required by this
    subparagraph.” 42 U.S.C. § 7412(n)(1)(A).
    4
    The other key statutory term in Section 112(n)(1)(A) –
    “necessary” – is not in dispute. EPA states that regulation of
    electric utilities is necessary “if the identified or potential hazards to
    public health or the environment will not be adequately addressed
    by the imposition of the requirements of” the Clean Air Act. 76
    Fed. Reg. 24,976, 24,987 (May 3, 2011).
    5
    EPA may reasonably exclude consideration of costs in
    determining whether it is “appropriate” to regulate electric
    utilities under the MACT program. The majority opinion
    upholds EPA’s interpretation.
    I respectfully disagree with the majority opinion. It is
    certainly true, as the majority opinion states, that the word
    “appropriate” is ambiguous in isolation, and that an agency’s
    reasonable interpretation of an ambiguous statutory term is
    permissible. See Chevron U.S.A. Inc. v. NRDC, 
    467 U.S. 837
    (1984). But the agency’s answer must be “a permissible
    construction of the statute” – or put another way, the agency’s
    interpretation of the ambiguity must be reasonable. 
    Id. at 843.
    Moreover, under the APA, an agency must consider the
    relevant factors when exercising its discretion under the
    governing statute.       See Motor Vehicle Manufacturers
    Association of the United States, Inc. v. State Farm Mutual
    Automobile Insurance Co., 
    463 U.S. 29
    , 42-43 (1983).
    In this case, whether one calls it an impermissible
    interpretation of the term “appropriate” at Chevron step one,
    or an unreasonable interpretation or application of the term
    “appropriate” at Chevron step two, or an unreasonable
    exercise of agency discretion under State Farm, the key point
    is the same: It is entirely unreasonable for EPA to exclude
    consideration of costs in determining whether it is
    “appropriate” to regulate electric utilities under the MACT
    program.
    To begin with, consideration of cost is commonly
    understood to be a central component of ordinary regulatory
    analysis, particularly in the context of health, safety, and
    environmental regulation. And Congress legislated against
    the backdrop of that common understanding when it enacted
    this statute in 1990. Put simply, as a matter of common sense,
    6
    common parlance, and common practice, determining
    whether it is “appropriate” to regulate requires consideration
    of costs.
    Drawing on his extensive administrative law and
    regulatory experience, not to mention his experience as a
    jurist, Justice Breyer has perhaps best explained the centrality
    of cost consideration to proper regulatory decisionmaking. In
    order “better to achieve regulatory goals – for example, to
    allocate resources so that they save more lives or produce a
    cleaner environment – regulators must often take account of
    all of a proposed regulation’s adverse effects.” Whitman v.
    American Trucking Associations, 
    531 U.S. 457
    , 490 (2001)
    (Breyer, J., concurring). That is so because “every real choice
    requires a decisionmaker to weigh advantages against
    disadvantages, and disadvantages can be seen in terms of
    (often quantifiable) costs.” Entergy Corp. v. Riverkeeper,
    Inc., 
    556 U.S. 208
    , 232 (2009) (opinion of Breyer, J.). Cost is
    a particularly salient consideration for administrative agencies
    today, “in an age of limited resources available to deal with
    grave environmental problems, where too much wasteful
    expenditure devoted to one problem may well mean
    considerably fewer resources available to deal effectively
    with other (perhaps more serious) problems.” 
    Id. at 233.
    An
    “absolute prohibition” on considering costs “would bring
    about irrational results. . . . [I]t would make no sense to
    require plants to spend billions to save one more fish or
    plankton. That is so even if the industry might somehow
    afford those billions.” 
    Id. at 232-33
    (internal citation and
    quotation marks omitted).
    In addition to Justice Breyer, many other leading jurists
    and scholars on administrative law have likewise recognized
    that cost generally has to be a relevant factor in the overall
    regulatory mix. Consider the following:
    7
       Justice Kagan: “[W]hat does it take in a statute to
    make us say, look, Congress has demanded that the
    regulation here occur without any attention to costs?
    In other words, essentially, Congress has demanded
    that the regulation has occurred in a fundamentally
    silly way.” Transcript of Oral Argument at 13, EPA v.
    EME Homer City Generation, L.P., No. 12-1182 (U.S.
    Dec. 10, 2013).5
       Professor Sunstein: “Without some sense of both costs
    and benefits – both nonmonetized and monetized –
    regulators will be making a stab in the dark.” Cass R.
    Sunstein, Cost-Benefit Analysis and the Environment,
    ETHICS 351, 354 (2005).
       Professor Sunstein: “A rational system of regulation
    looks not at the magnitude of the risk alone, but
    assesses the risk in comparison to the costs.” Cass R.
    Sunstein, Interpreting Statutes in the Regulatory State,
    103 HARV. L. REV. 405, 493 (1989).
       Professor Sunstein: “[A]ny reasonable judgment will
    ordinarily be based on some kind of weighing of costs
    and benefits, not on an inquiry into benefits alone. . . .
    If the costs would be high and the benefits low, on
    what rationale should . . . the EPA refuse even to
    consider the former? There appears to be no good
    answer. If there is not, the agency’s interpretations
    should be declared unreasonable.” Cass R. Sunstein,
    5
    To be clear, I do not read the statutory text at issue in the
    EME Homer case as encompassing costs, at least not in the way
    EPA argued there. But regardless of how that particular case turns
    out, the background principle succinctly articulated by Justice
    Kagan at oral argument reflects the commonsense and well-settled
    understanding that cost is an essential factor in determining whether
    it is “appropriate” to regulate.
    8
    Cost-Benefit Default Principles, 99 MICH. L. REV.
    1651, 1694 (2001).
       Professors Revesz and Livermore: “For certain kinds
    of governmental programs, the use of cost-benefit
    analysis is a requirement of basic rationality.”
    RICHARD L. REVESZ & MICHAEL A. LIVERMORE,
    RETAKING RATIONALITY 12 (2008).
       Professor Pierce: “All individuals and institutions
    naturally and instinctively consider costs in making
    any important decision. . . . [I]t is often impossible for
    a regulatory agency to make a rational decision
    without considering costs in some way.” Richard J.
    Pierce, Jr., The Appropriate Role of Costs in
    Environmental Regulation, 54 ADMIN. L. REV. 1237,
    1247 (2002).
    Every presidential administration for more than three
    decades has likewise made analysis of costs an integral part of
    the internal Executive Branch regulatory process. See
    generally Helen G. Boutrous, Regulatory Review in the
    Obama Administration: Cost-Benefit Analysis for Everyone,
    62 ADMIN. L. REV. 243, 246-48 (2010). Most recently, in
    2011, President Obama issued Executive Order 13,563, which
    follows an earlier Order issued by President Clinton and
    followed by President George W. Bush. The Order directs
    each agency “to use the best available techniques to quantify
    anticipated present and future benefits and costs as accurately
    as possible.” 76 Fed. Reg. 3821, 3821 (Jan. 21, 2011). Under
    President Obama’s Executive Order, agencies may proceed
    with proposed regulations only if the benefits justify the costs.
    
    Id. To be
    clear, Congress may itself weigh the costs of a
    particular kind of regulation, or otherwise take costs out of the
    equation, when assigning authority to executive and
    9
    independent agencies to regulate a particular industry or in a
    particular area.    See Whitman v. American Trucking
    Associations, 
    531 U.S. 457
    (2001) (statutory provision does
    not include consideration of costs). And even when an
    agency has to take costs into account, it of course may
    conclude that the benefits of a proposed regulation outweigh
    the costs. Moreover, different agency heads, and different
    Presidents, may assess and weigh certain benefits and costs
    differently depending on their overarching philosophies.
    But when considering just as a general matter whether it
    is “appropriate” to regulate, it is well-accepted that
    consideration of costs is a central and well-established part of
    the regulatory decisionmaking process.
    But EPA did not consider costs here. And EPA’s failure
    to do so is no trivial matter. The estimated cost of compliance
    with EPA’s Final Rule is approximately $9.6 billion per year,
    by EPA’s own calculation. 77 Fed. Reg. at 9306, Table 2. To
    put it in perspective, that amount would pay the annual health
    insurance premiums of about two million Americans. It
    would pay the annual salaries of about 200,000 members of
    the U.S. Military. It would cover the annual budget of the
    entire National Park Service three times over. Put simply, the
    Rule is “among the most expensive rules that EPA has ever
    promulgated.”       JAMES E. MCCARTHY, CONGRESSIONAL
    RESEARCH SERVICE, R42144, EPA’S UTILITY MACT: WILL
    THE LIGHTS GO OUT? 1 (2012).
    EPA calculated the $9.6 billion cost figure as part of its
    Regulatory Impact Analysis accompanying the Rule. That
    Regulatory Impact Analysis was required by President
    Obama’s Executive Order. Yet EPA’s official position in this
    Court is that the costs identified in the Regulatory Impact
    Analysis should have “no bearing on” the determination of
    whether regulation is appropriate. EPA Br. 55.
    10
    On the other side of the ledger, the benefits of this Rule
    are disputed: Industry petitioners focus on the reduction in
    hazardous air pollutant emissions attributable to the
    regulations, which amount to only $4 to $6 million dollars
    each year. See 77 Fed. Reg. at 9428; State, Industry & Labor
    Br. 21. If those figures are right, the Rule costs nearly $1,500
    for every $1 of health and environmental benefit produced.
    For its part, EPA says it would estimate the benefits at $37 to
    $90 billion dollars based on what it says are the indirect
    benefits of reducing PM2.5, a type of fine particulate matter
    that is not itself regulated as a hazardous air pollutant. See 77
    Fed. Reg. at 9428.
    To be sure, as I have said, EPA may be able to conclude
    that the benefits outweigh the costs in determining whether it
    is “appropriate” to regulate electric utilities under the MACT
    program. But to reiterate, that’s not what EPA has done in
    this Rule. Rather, according to EPA, it is irrelevant how
    large the costs are or whether the benefits outweigh the costs
    in determining whether it is “appropriate” to regulate
    electric utilities under the MACT program.
    In response to petitioners’ claim that the legal issue here
    has huge real-world consequences, the majority opinion
    suggests that it may not matter all that much that EPA refused
    to consider costs in deciding whether it is “appropriate” to
    regulate electric utilities under the MACT program, because
    EPA does account for costs in the second step of the MACT
    program, when EPA sets “beyond-the-floor” standards. Maj.
    Op. at 24. I respectfully find that to be a red herring. After
    all, once EPA determines that it is appropriate to regulate
    electric utilities under the MACT program, costs are not
    relevant at the first, “setting the floor” stage of the MACT
    program. And meeting that floor will be prohibitively
    expensive, particularly for many coal-fired electric utilities,
    regardless of whether EPA decides to go further and set a
    11
    “beyond-the-floor” standard. So in the real world in which
    electric utilities operate, the financial burden of complying
    with that first “setting the floor” step of the MACT program –
    where costs are not considered – will likely knock a bunch of
    coal-fired electric utilities out of business and require
    enormous expenditures by other coal and oil-fired electric
    utilities. Telling someone that costs will be considered in a
    regulatory step that occurs after they have already had to pay
    an exorbitant amount and may already have been put out of
    business is not especially reassuring. The majority opinion’s
    attempt to downplay the effects of its decision thus rings a bit
    hollow.
    In downplaying the issue here, the majority opinion also
    says that the result of this case is that electric utilities will just
    be treated like other sources. In saying that, the majority
    opinion, in my respectful view, does not sufficiently account
    for the fact that treating electric utilities differently from
    standard sources was the intent of Section 112(n)(1)(A), as
    revealed by the statutory text. If Congress had intended EPA
    to consider the costs of regulating electric utilities only when
    deciding whether to adopt beyond-the-floor standards, and not
    as a threshold decision in deciding whether to regulate electric
    utilities under the MACT program to begin with, it would
    have done one of two things: It would have either
    automatically regulated electric utilities under the MACT
    program, as it did with other sources, or provided that
    regulation under the MACT program would be automatic if
    the three-year study found that these sources indeed emitted
    hazardous air pollutants. That Congress declined to choose
    either of those options, and instead directed EPA to regulate
    electric utilities under the MACT program only if
    “appropriate,” reinforces the conclusion that Congress
    intended EPA to consider costs in deciding whether to
    12
    regulate electric utilities at the threshold, and not simply at the
    second beyond-the-floor stage of the MACT program.
    Not only does EPA’s approach depart from the clear
    statutory scheme, standard agency decisionmaking, and the
    common understanding of the term “appropriate” in this
    regulatory context, it also effectively negates the
    congressional compromise that was ultimately embodied in
    the statutory text of the 1990 Act. Under the initial Senate
    proposal, electric utilities would been have listed as sources
    under Section 112(c) and therefore automatically regulated
    under Section 112(d), the MACT program. See 3 A
    LEGISLATIVE HISTORY OF THE CLEAN AIR ACT AMENDMENTS
    OF 1990, at 4119, 4418-28 (1993).               But the House
    subsequently modified the Senate bill to make regulation of
    electric utilities under the MACT program dependent on the
    results of a study and the Administrator’s subsequent
    determination that regulation was “appropriate” and
    necessary. See 2 
    id. at 2148-49.
    In the words of the House
    bill’s legislative sponsor, Congressman Oxley, the goal of the
    counter-proposal was to provide “protection of the public
    health while avoiding the imposition of excessive and
    unnecessary costs on residential, industrial, and commercial
    consumers of electricity.” See 1 
    id. at 1417
    (emphasis added).
    The House’s proposal ultimately prevailed with the
    Conference Committee “because of . . . the extremely high
    costs that electric utilities will face under other provisions of
    the new Clean Air Act amendments.” 
    Id. at 1416.
    That
    Conference Committee view – that EPA should avoid
    imposing unwarranted financial burdens when deciding to
    regulate electric utilities – is encapsulated in the textual
    directive that EPA regulate electric utilities under the MACT
    program only if “appropriate.”
    13
    The majority opinion here says that the term
    “appropriate” is ambiguous. But the Supreme Court often
    looks to legislative history to help inform interpretation of
    otherwise ambiguous statutes, including in Chevron cases.
    See 
    Chevron 467 U.S. at 843
    n.9. And here, the legislative
    history should resolve any lingering ambiguity on the key
    point of what “appropriate” encompasses. It establishes that
    Congress in 1990 chose to impose these threshold
    requirements on EPA specifically because it wanted EPA to
    consider costs before regulating electric utilities under the
    MACT program.            EPA’s interpretation of Section
    112(n)(1)(A) in this case upsets Congress’s careful balance
    and stacks the deck in favor of regulation of electric utilities
    under the MACT program. In effect, EPA’s reading of the
    statute replaces its authority to regulate electric utilities if
    “appropriate” with a command to regulate electric utilities
    under the MACT program regardless of costs. That is not
    what Congress intended or permitted and thus is beyond
    EPA’s authority. See 
    Chevron, 467 U.S. at 843
    n.9.
    In upholding EPA’s cost-blind approach, the majority
    opinion points to other statutory provisions that expressly
    reference cost and invokes the familiar interpretive canon that
    “[w]here Congress includes particular language in one section
    of a statute but omits it in another section of the same Act, it
    is generally presumed that Congress acts intentionally and
    purposely in the disparate inclusion or exclusion.” Russello v.
    United States, 
    464 U.S. 16
    , 23 (1983). The majority opinion
    assigns particular weight to the Supreme Court’s decision in
    Whitman v. American Trucking Associations, 
    531 U.S. 457
    (2001), which referenced that canon when construing a
    different section of the Clean Air Act. See 
    Whitman, 531 U.S. at 467
    (“We have therefore refused to find implicit in
    ambiguous sections of the CAA an authorization to consider
    costs that has elsewhere, and so often, been expressly
    14
    granted.”). As in Whitman, according to the majority opinion,
    Congress’s decision not to explicitly mention cost in Section
    112(n)(1)(A), despite doing so in other parts of the Act,
    creates a negative implication that costs are an unnecessary
    consideration.
    But I respectfully believe the majority opinion is
    misreading – or at least over-reading – Whitman. Whitman
    was a textualist decision written for a unanimous Court by
    Justice Scalia. It stands for the basic proposition that
    consideration of costs cannot be jammed into a statutory
    factor that, by its terms, otherwise would not encompass
    “costs,” particularly when other provisions of the Act
    expressly reference costs. See 
    Entergy, 556 U.S. at 223
    (Whitman “stands for the rather unremarkable proposition that
    sometimes statutory silence, when viewed in context, is best
    interpreted as limiting agency discretion.”).
    In Whitman itself, the statutory factor was a provision of
    the Clean Air Act, Section 109(b)(1), that directed EPA to set
    ambient air quality standards at levels “requisite to protect the
    public health” with “an adequate margin of safety.” 42
    U.S.C. § 7409(b)(1). The dispute concerned whether those
    “modest words” granted EPA “the power to determine
    whether implementation costs should moderate national air
    quality 
    standards.” 531 U.S. at 468
    . Concluding that EPA
    had not been granted such power, the Court speaking through
    Justice Scalia observed that cost “is both so indirectly related
    to public health and so full of potential for canceling the
    conclusions drawn from direct health effects that it would
    surely have been expressly mentioned in §§ 108 and 109 had
    Congress meant it to be considered.” 
    Id. at 469.
    The statutory provision at issue in Whitman differs
    significantly from the statute at issue here. The statutory
    15
    provision in Whitman tied regulation solely to “public health,”
    which is typically a critical factor on the other side of the
    balance from costs, not a factor that includes costs. Here, by
    contrast, the key statutory term is “appropriate” – the classic
    broad and all-encompassing term that naturally and
    traditionally includes consideration of all the relevant factors,
    health and safety benefits on the one hand and costs on the
    other. To unblinkingly rely on Whitman here is to overlook
    the distinct language of the relevant statutes. Cf. Michigan v.
    EPA, 
    213 F.3d 663
    , 677-79 (D.C. Cir. 2000) (the term
    “significant” “does not in itself convey a thought that
    significance should be measured in only one dimension,” and
    in “some contexts, ‘significant’ begs a consideration of
    costs”).
    To sum up: All significant regulations involve tradeoffs,
    and I am very mindful that Congress has assigned EPA, not
    the courts, to make many discretionary calls to protect both
    our country’s environment and its productive capacity. In this
    case, if EPA had decided, in an exercise of its judgment, that
    it was “appropriate” to regulate electric utilities under the
    MACT program because the benefits outweigh the costs, that
    decision would be reviewed under a deferential arbitrary and
    capricious standard of review. See American Radio Relay
    League, Inc. v. FCC, 
    524 F.3d 227
    , 247-48 (D.C. Cir. 2008)
    (separate opinion of Kavanaugh, J.). But before we assess the
    merits of any cost-benefit balancing, this statutory scheme
    requires that we first ensure that EPA has actually considered
    the costs. See State 
    Farm, 463 U.S. at 42-43
    . In my view,
    whether we call it a Chevron problem or a State Farm
    problem, it is unreasonable for EPA to exclude consideration
    of costs when deciding whether it is “appropriate” to regulate
    16
    electric utilities under the MACT program. I respectfully
    dissent from the majority opinion’s contrary conclusion.6
    II
    This case implicates another important administrative law
    issue, the “zone of interests” test under the Administrative
    Procedure Act.7 The Court holds that petitioner Julander
    Energy Company falls outside the “zone of interests” the
    Clean Air Act is designed to protect and thus cannot challenge
    the Final Rule. The Court reasons that the concerns raised by
    6
    On the Chevron point, I add one further comment. When the
    Government wins a Chevron case, it may prevail at Chevron step
    one (because the agency’s interpretation of the statute is mandated
    by the statutory language) or at Chevron step two (because the
    agency’s interpretation of an ambiguous statute is at least
    reasonable). In those cases, the step one or step two label may have
    practical significance, as it may determine whether the agency
    could try to adopt a contrary interpretation in the future. On the
    other hand, when the agency loses a Chevron case because the
    agency has adopted an interpretation outside the permissible bounds
    of the statute, even after reading relevant ambiguities in the
    agency’s favor, there is not much if any practical difference for
    purposes of future agency action whether we label our decision as
    Chevron step one or Chevron step two. See generally City of
    Arlington v. FCC, 
    133 S. Ct. 1863
    , 1868, 1874 (2013). So it is
    here, in my view.
    7
    This Court has traditionally referred to the zone of interests
    test as a component of “prudential standing.” As the Supreme
    Court has recently explained, however, the test does not belong
    under the “prudential” rubric. Lexmark International, Inc. v. Static
    Control Components, Inc., No. 12-873 (U.S. Mar. 25, 2014).
    Instead, whether a plaintiff comes with the “zone of interests” is a
    statutory question “that requires us to determine, using traditional
    tools of statutory interpretation, whether a legislatively conferred
    cause of action encompasses a particular plaintiff’s claim.” 
    Id., slip op.
    at 8.
    17
    Julander, a natural gas production company, are merely to
    seek more stringent regulation of its coal and oil company
    competitors. See Maj. Op. at 57-58.
    I reluctantly join that portion of the Court’s opinion
    because it is consistent with some of this Court’s previous
    decisions applying the zone of interests test. I hasten to add
    that the decisions on which the Court today relies are
    inconsistent with other of this Court’s precedents. Given that
    our case law makes this issue a de facto coin flip, I cannot
    fault an opinion that lands on heads rather than tails.
    I am concerned, however, about the erratic inconsistency
    in our case law. I am even more concerned that our cases
    holding that competitors are outside the zone of interests –
    including today’s decision – are inconsistent with the
    governing Supreme Court precedents. I write separately to
    explain my concerns.
    The Supreme Court first announced the APA “zone of
    interests” test in Association of Data Processing Service
    Organizations, Inc. v. Camp, 
    397 U.S. 150
    (1970) (Data
    Processing). In that case, vendors of data processing services
    challenged the Comptroller of the Currency’s decision to
    allow competitor national banks to sell the same services.
    The data processing vendors alleged that the agency decision
    violated a provision of the National Bank Act. The district
    court dismissed the case for lack of standing, and the court of
    appeals affirmed the dismissal. The Supreme Court reversed.
    For purposes of Article III standing, the Court first said that
    there was “no doubt” that the petitioners had alleged a
    sufficient “injury in fact.” 
    Id. at 152.
    In reaching that
    conclusion, the Court rejected the then-prevailing requirement
    that plaintiffs show that a defendant’s actions invaded a “legal
    18
    interest” belonging to the plaintiff. 
    Id. at 153.
    The Court
    instead adopted the now-familiar “injury in fact” test.
    For purposes of the APA, the Court added that the
    separate question of being able to sue under the APA
    “concerns, apart from the ‘case’ or ‘controversy’ test, the
    question whether the interest sought to be protected by the
    complainant is arguably within the zone of interests to be
    protected or regulated by the statute or constitutional
    guarantee in question.” 
    Id. And the
    Court said that the “zone
    of interests” requirement was satisfied by the plaintiffs in
    Data Processing, who were competitors of the national banks.
    The Court noted with approval the “trend . . . toward
    enlargement of the class of people who may protest
    administrative action.” 
    Id. at 154.
    In keeping with that trend,
    the Court refused to take an overly restrictive view of “the
    generous review provisions” of the APA, which the Court
    noted should be construed “not grudgingly but as serving a
    broadly remedial purpose.” 
    Id. at 156.8
    The Supreme Court reaffirmed its broad understanding of
    the zone of interests test in Arnold Tours, Inc. v. Camp, 
    400 U.S. 45
    (1970) and Investment Company Institute v. Camp,
    
    401 U.S. 617
    (1971). The plaintiffs in both cases were
    competitors of national banks.        Both cases concerned
    decisions by the Comptroller of the Currency to authorize
    8
    Although Data Processing referenced the Administrative
    Procedure Act, the opinion did not explicitly tie the zone of
    interests test to the text of the APA. The Court subsequently
    clarified that the zone of interests test is a “gloss” on Section 702 of
    the APA, which grants the right to judicial review of an agency
    action to any person “adversely affected or aggrieved” by that
    action. See Clarke v. Securities Industry Association, 
    479 U.S. 388
    ,
    395, 400 n.16 (1987).
    19
    national banks to offer new services to customers: travel
    services in Arnold Tours and investment services in
    Investment Company Institute. And in both cases, the Court
    held that plaintiffs who would have to compete with the banks
    under the new regulations satisfied the zone of interests test
    and could challenge the Comptroller’s decision. See Arnold
    
    Tours, 400 U.S. at 46
    ; Investment Company 
    Institute, 401 U.S. at 620-21
    .
    Notably, Justice Harlan dissented in Investment Company
    Institute because there was no evidence of “any congressional
    concern for the interests of petitioners and others like them in
    freedom from competition.” Investment Company 
    Institute, 401 U.S. at 640
    (Harlan, J., dissenting). But that fact, the
    Court held, was not fatal to the plaintiffs’ case; it was enough
    to satisfy the zone of interests test that Congress, for its own
    reasons, “did legislate against the competition that the
    petitioners challenge.” 
    Id. at 621
    (majority opinion).
    Thus, at the time of its inception, the zone of interests test
    was understood to be part of a broader trend toward
    expanding the class of persons able to bring suits under the
    APA challenging agency actions. See Copper & Brass
    Fabricators Council, Inc. v. Department of the Treasury, 
    679 F.2d 951
    , 953 n.2 (D.C. Cir. 1982) (R.B. Ginsburg, J.,
    concurring) (in each of the Supreme Court’s first four zone of
    interests decisions, the Court “utilized the ‘zone’ test to
    reverse lower court decisions which had held that the
    respective plaintiffs lacked standing”). Although the Supreme
    Court was cognizant of the dangers of freely permitting
    judicial review of agency decisions, it nonetheless “struck the
    balance in a manner favoring review,” as the Court later
    described it, excluding only “those would-be plaintiffs not
    even arguably within the zone of interests to be protected or
    regulated by the statute.” Clarke v. Securities Industry
    20
    Association, 
    479 U.S. 388
    , 397 (1987) (internal quotation
    marks omitted).
    And importantly for present purposes, the Supreme Court
    in those early zone of interest cases specifically held that the
    class of persons who could sue specifically included plaintiffs
    who were complaining about what they alleged was
    unlawfully lax agency regulation of the plaintiffs’
    competitors. The theory was simple: Competitors, almost by
    definition, are among the class of people “arguably” to be
    “protected” when Congress limited the activities of other
    competitors in the relevant industry. So absent a discernible
    congressional intent to preclude suit by the plaintiffs, the suit
    could proceed.
    In the years following Data Processing, however, this
    Court appeared to resist the Supreme Court’s direction on
    competitor suits under the zone of interests test. This Court’s
    cases still said, for example, that the zone of interests test
    required “some indicia – however slight – that the litigant
    before the court was intended to be protected” by the statute
    providing a cause of action. See, e.g., Copper & Brass
    
    Fabricators, 679 F.2d at 952
    (majority opinion).
    In Clarke v. Securities Industry Association, 
    479 U.S. 388
    (1987), however, the Supreme Court reaffirmed that it
    meant what it said in Data Processing. And the Court in
    Clarke explicitly stated that D.C. Circuit cases had incorrectly
    departed from Data Processing. See 
    id. at 400
    n.15.
    Clarke was another case in which some plaintiffs argued
    that the Comptroller of the Currency’s regulation of the
    plaintiffs’ competitors was unduly lax.        Specifically,
    securities brokers challenged the Comptroller’s decision to
    exempt certain bank offices that offered brokerage services
    from restrictions on branch banking. The Court began its
    21
    analysis by clarifying that although the zone of interests test
    was “basically one of interpreting congressional intent,” the
    inquiry did not require a congressional intent to benefit the
    plaintiff class. 
    Clarke, 479 U.S. at 394
    , 399-400. Rather,
    suits would be allowed unless a “congressional intent to
    preclude review” in suits by the plaintiffs was “fairly
    discernible.” 
    Id. at 403
    (citing Block v. Community Nutrition
    Institute, 
    467 U.S. 340
    , 351 (1984)) (internal quotation marks
    omitted). The zone of interests test “is a guide for deciding
    whether, in view of Congress’ evident intent to make agency
    action presumptively reviewable, a particular plaintiff should
    be heard to complain of a particular agency decision. In cases
    where the plaintiff is not itself the subject of the contested
    regulatory action, the test denies a right of review if the
    plaintiff’s interests are so marginally related to or inconsistent
    with the purposes implicit in the statute that it cannot
    reasonably be assumed that Congress intended to permit the
    suit. The test is not meant to be especially demanding.” 
    Id. at 399.
    In sum, Clarke confirmed the capacious view of the zone
    of interests requirement announced in Data Processing and
    similar cases. It reaffirmed the presumption in favor of
    allowing suit and made clear that the suit should be allowed
    unless the statute evinces discernible congressional intent to
    preclude review.         See 3 RICHARD J. PIERCE, JR.,
    ADMINISTRATIVE LAW TREATISE § 16.9, at 1521 (5th ed.
    2010) (“An injured plaintiff has standing under the APA
    unless Congress intended to preclude judicial review at the
    behest of parties in plaintiff’s class.”).
    And most importantly for our purposes, Clarke
    confirmed that competitors were presumptively within the
    zone of interests under the APA when challenging allegedly
    lax regulation of other competitors in the relevant industry,
    22
    absent discernible evidence of contrary congressional intent.
    See 
    id. at 403
    (“competitors who allege an injury that
    implicates the policies of the National Bank Act are very
    reasonable candidates to seek review of the Comptroller’s
    rulings”).
    As one respected commentator has summarized the
    Supreme Court’s case law: “It is hardly a caricature to say
    that the current law is this: Businesses desiring to complain
    that the government is regulating their competitors with
    insufficient stringency are invariably and automatically held
    to fall within the zone of interests of any allegedly violated
    statute . . . .” Jonathan R. Siegel, Zone of Interests, 92 GEO.
    L.J. 317, 347 (2004) (emphasis added).
    Despite the apparent clarity of Clarke – and its explicit
    disapproval of this Court’s zone of interests cases – some of
    this Court’s post-Clarke decisions nonetheless still have
    barred competitors from suing because they are purportedly
    outside the zone of interests. For example, in Hazardous
    Waste Treatment Council v. EPA, 
    861 F.2d 277
    (D.C. Cir.
    1988) – a case on which the Court today relies – we
    considered a claim by waste treatment companies that EPA’s
    waste disposal standards were unduly lax toward some
    competitors of the waste treatment companies. 
    Id. at 283.
    As
    I read the cases, Clarke, Data Processing, Investment
    Company, and Arnold Tours had contemplated that the zone
    of interests test would be satisfied in such a scenario.
    Nevertheless, in Hazardous Waste, we held that the plaintiffs
    did not fall within the zone of interests “in the absence of
    either some explicit evidence of an intent to benefit such
    firms, or some reason to believe that such firms would be
    unusually suitable champions of Congress’s ultimate goals.”
    Hazardous 
    Waste, 861 F.2d at 283
    .
    23
    In my view, that language in Hazardous Waste is difficult
    to square with what the Supreme Court said in Clarke and
    earlier cases.9 In those cases, the Supreme Court had
    specifically said that there does not need to be evidence of an
    intent to benefit the plaintiff class. In fact, the Supreme Court
    said that suit should be allowed unless there was a discernible
    congressional intent to preclude suit by the plaintiff class. In
    other words, this Court’s cases seemingly flipped the
    presumption in favor of allowing suit by competitor plaintiffs
    to a presumption against allowing suit by competitor
    plaintiffs.
    The confusion in our case law has only grown in the
    years following Hazardous Waste. Sometimes we allow
    competitors to sue, opining, for example, that we “take from”
    cases like Clarke “the principle that a plaintiff who has a
    competitive interest in confining a regulated industry within
    certain congressionally imposed limitations may sue to
    prevent the alleged loosening of those restrictions.” First
    National Bank & Trust Co. v. National Credit Union
    Administration, 
    988 F.2d 1272
    , 1277 (D.C. Cir. 1993); see,
    e.g., Sherley v. Sebelius, 
    610 F.3d 69
    , 75 (D.C. Cir. 2010)
    (allowing doctors to sue because of allegedly illegal agency
    under-regulation of other doctors: “Because the Act can
    plausibly be interpreted to limit research involving”
    embryonic stem cells, “the Doctors’ interest in preventing the
    NIH from funding such research is not inconsistent with the
    purposes of the Amendment. . . . [T]hat is all that matters.”);
    Honeywell International Inc. v. EPA, 
    374 F.3d 1363
    , 1370
    (D.C. Cir. 2004) (allowing chemical manufacturer to sue
    because of allegedly illegal agency under-regulation of
    9
    Chief Judge Wald stated as much at the time. See Hazardous
    Waste Treatment Council v. Thomas, 
    885 F.2d 918
    , 931 (D.C. Cir.
    1989) (Wald, C.J., dissenting).
    24
    competing chemicals: “If there is reason to believe that a
    party’s interest in statutory enforcement will advance, rather
    than hinder, the operation of a statute, the court can
    reasonably assume that Congress intended to permit the
    suit.”); Ethyl Corp. v. EPA, 
    306 F.3d 1144
    , 1148 (D.C. Cir.
    2002) (allowing manufacturer of fuel additives to sue because
    of allegedly illegal under-regulation of automobile
    manufacturers: zone of interests “includes not only those
    challengers expressly mentioned by Congress, but also
    unmentioned potential challengers that Congress would have
    thought useful for the statute’s purpose”); Wabash Valley
    Power Association, Inc. v. FERC, 
    268 F.3d 1105
    , 1112 (D.C.
    Cir. 2001) (allowing power association to sue because of
    allegedly illegal under-regulation of merging utility
    companies: “In this case, as a competitor crying foul, Wabash
    satisfies prudential standing requirements.”); Mova
    Pharmaceutical Corp. v. Shalala, 
    140 F.3d 1060
    , 1076 (D.C.
    Cir. 1998) (allowing drug manufacturer to sue because of
    allegedly illegal agency under-regulation of other drug
    manufacturer: “Upjohn’s interest in limiting competition for
    its product is, by its very nature, linked with the statute’s goal
    of limiting competition between generic manufacturers.”)
    (internal citation and quotation marks omitted); see also
    Amgen, Inc. v. Smith, 
    357 F.3d 103
    , 109 (D.C. Cir. 2004)
    (“Parties motivated by purely commercial interests routinely
    satisfy the zone of interests test under this court’s
    precedents.”).
    But other times, as in Hazardous Waste, we say exactly
    the opposite, that competitors are not within the zone of
    interests and are barred from suing. See, e.g., Association of
    Battery Recyclers, Inc. v. EPA, 
    716 F.3d 667
    , 674 (D.C. Cir.
    2013) (lead smelter could not object to lax regulation of other
    lead smelters: plaintiff objected “not to any regulatory burden
    imposed on it but instead to the absence of regulatory burdens
    25
    imposed on its competitors”); Grocery Manufacturers
    Association v. EPA, 
    693 F.3d 169
    , 179 (D.C. Cir. 2012) (food
    producers could not object to lax regulation of ethanol
    producers who compete with food producers in market to
    purchase corn);10 Cement Kiln Recycling Coalition v. EPA,
    
    255 F.3d 855
    , 871 (D.C. Cir. 2001) (hazardous waste
    combustors could not object to lax regulation of competing
    combustors: “the Council’s interest lies only in increasing the
    regulatory burden on others”); ANR Pipeline Co. v. FERC,
    
    205 F.3d 403
    , 408 (D.C. Cir. 2000) (natural gas pipeline
    operator could not object to lax regulation of competitor’s
    pipeline: plaintiff’s “only concern is with suppressing
    competition from Nautilus, and that economic interest is not
    within the zone of interests protected by NEPA”); Liquid
    Carbonic Industries Corp. v. FERC, 
    29 F.3d 697
    , 705 (D.C.
    Cir. 1994) (industrial gas corporation could not object to lax
    regulation of competitor’s facilities:      “There being no
    indication that Congress intended to benefit a second-tier
    competitor, Liquid Carbonic does not have standing as an
    intended beneficiary.”).
    Those competing lines of cases have developed without
    any apparent distinguishing principle. Having carefully
    reviewed all of them together in one sitting, I frankly cannot
    find a clear line to separate the cases where we have found
    competitors to be within the zone of interests from the cases
    where we have not.
    10
    In Grocery Manufacturers Association v. EPA, 
    693 F.3d 169
    (D.C. Cir. 2012), we addressed an additional question of whether
    the zone of interests test is a jurisdictional requirement. The
    Supreme Court has since made clear that the zone of interests test is
    not jurisdictional. See Lexmark International, Inc. v. Static Control
    Components, Inc., No. 12-873, slip op. at 9 n.4 (U.S. Mar. 25,
    2014).
    26
    Moreover, there is nothing in the Clean Air Act that
    poses a stricter limit on competitor suits than in APA cases
    involving other statutes. The default rule set forth by the
    Supreme Court for APA cases is that competitors may sue,
    unless the substantive statute at issue excludes such suits.
    Nothing in the Clean Air Act indicates an intent to exclude
    competitor suits. And it is surely not incongruent with the
    Clean Air Act to allow competitor suits. By definition, a
    successful competitor suit would mean that the source would
    have to comply with stricter Clean Air Act limits. Put simply:
    Allowing competitor suits in Clean Air Act cases will mean
    cleaner air. Excluding competitor suits in Clean Air Act cases
    will mean dirtier air.
    Apart from our case law’s internal inconsistency, the
    larger problem, as I see it, is that the line of cases in this Court
    that have held that competitors are outside the zone of
    interests is out of step with the Supreme Court’s case law
    from Data Processing to Clarke. What is more, the Supreme
    Court’s cases since Clarke have only reinforced the broad
    conception set forth in Data Processing and Clarke. See, e.g.,
    National Credit Union Administration v. First National Bank
    & Trust Co., 
    522 U.S. 479
    , 493-94 (1998) (“As competitors
    of federal credit unions, respondents certainly have an interest
    in limiting the markets that federal credit unions can serve,
    and the NCUA’s interpretation has affected that interest by
    allowing federal credit unions to increase their customer
    base.”); see also Air Courier Conference of America v.
    American Postal Workers Union, AFL-CIO, 
    498 U.S. 517
    ,
    529 (1991) (“Clarke is the most recent in a series of cases in
    which we have held that competitors of regulated entities
    have standing to challenge regulations.”); Lexmark
    International, Inc. v. Static Control Components, Inc., No. 12-
    873, slip op. at 11 (U.S. Mar. 25, 2014) (a “lenient approach”
    to the zone of interests test “is an appropriate means of
    27
    preserving the flexibility of the APA’s omnibus judicial-
    review provision, which permits suit for violations of
    numerous statutes of varying character that do not themselves
    include causes of action for judicial review”).
    Among the Supreme Court’s post-Clarke decisions is
    Match-E-Be-Nash-She-Wish Band of Pottawatomi Indians v.
    Patchak, 
    132 S. Ct. 2199
    (2012). Although not a competitor
    case, the reasoning of Match-E reinforces Data Processing
    and Clarke, and reaffirms the Supreme Court’s broad
    conception of the zone of interests under the APA.
    Writing for the Court in Match-E, Justice Kagan
    reiterated that the zone of interests requirement is a low bar:
    The test “is not meant to be especially demanding. We apply
    the test in keeping with Congress’s evident intent when
    enacting the APA to make agency action presumptively
    reviewable.       We do not require any indication of
    congressional purpose to benefit the would-be plaintiff. And
    we have always conspicuously included the word ‘arguably’
    in the test to indicate that the benefit of any doubt goes to the
    plaintiff. The test forecloses suit only when a plaintiff’s
    interests are so marginally related to or inconsistent with the
    purposes implicit in the statute that it cannot reasonably be
    assumed that Congress intended to permit the suit.” 
    Id. at 2210
    (emphasis added) (footnote, citation, and some internal
    quotation marks omitted).
    Match-E reaffirmed – in line with Data Processing and
    Clarke – that the plaintiff need not be among a class that
    Congress intended to benefit in the statute at hand. And
    Match-E further reaffirmed that a wide variety of interests,
    including economic interests related to the agency’s allegedly
    unlawful action with respect to someone else, fall within the
    zone of interests. There, a residential property owner claimed
    28
    that the Interior Department violated federal law when it
    acquired a parcel of land for use by a nearby Indian tribe as a
    casino. See 
    id. at 2202-03.
    All agreed that the federal statute
    was not designed to benefit a property owner who objects
    when the Federal Government acquires another property
    owner’s land in order to help Indians. See 
    id. at 2210
    n.7.
    The Supreme Court nonetheless concluded that the zone of
    interests test was satisfied. The Supreme Court said that
    “neighbors to the use (like Patchak) are reasonable – indeed,
    predictable – challengers of the Secretary’s decisions: Their
    interests, whether economic, environmental, or aesthetic,
    come within § 465’s regulatory ambit.” 
    Id. at 2212
    (emphasis
    added).
    Given its music and its words, Match-E should have put a
    final end to this Court’s crabbed approach to the zone of
    interests test. But our Court has still continued since Match-E
    to hold – at least in some cases – that the zone of interests test
    prevents businesses from complaining about allegedly illegal
    agency under-regulation of their competitor businesses. See,
    e.g., Association of Battery 
    Recyclers, 716 F.3d at 674
    ;
    Grocery Manufacturers 
    Association, 693 F.3d at 179
    .
    Put simply, our current zone of interests case law is
    inconsistent and unpredictable. Perhaps most troubling, our
    cases holding that competitors are outside the zone of
    interests are inconsistent with Supreme Court precedent, as I
    read it. In my respectful view, too much is at stake in the
    administrative process, for health, safety, and environmental
    regulation, and for the economic interests affected by these
    cases for us to continue muddling along in this way. This
    state of affairs should receive a careful examination at some
    point in the near future. Whether a party can sue in court to
    challenge illegal agency action on such important matters
    29
    should not come down to the equivalent of a coin flip. We
    can do better.
    ***
    I respectfully dissent from the majority opinion’s
    conclusion that EPA may reasonably exclude consideration of
    costs when deciding whether it is appropriate to regulate
    electric utilities under the MACT program. And on the zone
    of interests test, I accept the majority opinion’s conclusion
    that Julander falls outside the zone of interests, at least under
    some of our precedents. But in my view, those precedents are
    not consistent with other decisions of this Court or with the
    Supreme Court’s case law and should be corrected in due
    course.
    

Document Info

Docket Number: 12-1100, 12-1101, 12-1102, 12-1147, 12-1172, 12-1173, 12-1174, 12-1175, 12-1176, 12-1177, 12-1178, 12-1180, 12-1181, 12-1182, 12-1183, 12-1184, 12-1185, 12-1186, 12-1187, 12-1188, 12-1189, 12-1190, 12-1191, 12-1192, 12-1193, 12-1194, 12-1195, 12-1196

Citation Numbers: 409 U.S. App. D.C. 248, 748 F.3d 1222, 44 Envtl. L. Rep. (Envtl. Law Inst.) 20088, 2014 WL 1420294, 78 ERC (BNA) 1757, 2014 U.S. App. LEXIS 6944

Judges: Garland, Rogers, Kavanaugh

Filed Date: 4/15/2014

Precedential Status: Precedential

Modified Date: 11/5/2024

Authorities (49)

board-of-regents-of-the-university-of-washington-v-environmental , 86 F.3d 1214 ( 1996 )

Arnold Tours, Inc. v. Camp , 91 S. Ct. 158 ( 1970 )

American Textile Manufacturers Institute, Inc. v. Donovan , 101 S. Ct. 2478 ( 1981 )

Whitman v. American Trucking Assns., Inc. , 121 S. Ct. 903 ( 2001 )

Russello v. United States , 104 S. Ct. 296 ( 1983 )

Block v. Community Nutrition Institute , 104 S. Ct. 2450 ( 1984 )

Fund Animals v. Hogan, Matthew J. , 428 F.3d 1059 ( 2005 )

National Lime Association v. Environmental Protection ... , 627 F.2d 416 ( 1980 )

Sierra Club v. United States Environmental Protection Agency , 167 F.3d 658 ( 1999 )

Motor Vehicle Mfrs. Assn. of United States, Inc. v. State ... , 103 S. Ct. 2856 ( 1983 )

Marsh v. Oregon Natural Resources Council , 109 S. Ct. 1851 ( 1989 )

National Cable & Telecommunications Assn. v. Brand X ... , 125 S. Ct. 2688 ( 2005 )

Radlax Gateway Hotel, LLC v. Amalgamated Bank , 132 S. Ct. 2065 ( 2012 )

Chevron U. S. A. Inc. v. Natural Resources Defense Council, ... , 104 S. Ct. 2778 ( 1984 )

Sierra Club v. Environmental Protection Agency , 353 F.3d 976 ( 2004 )

Troy Corporation v. Carol M. Browner, Administrator, United ... , 120 F.3d 277 ( 1997 )

Sierra Club v. Environmental Protection Agency , 292 F.3d 895 ( 2002 )

Catawba County v. Environmental Protection Agency , 571 F.3d 20 ( 2009 )

Ethyl Corp. v. Environmental Protection Agency , 306 F.3d 1144 ( 2002 )

Hazardous Waste Treatment Council v. U.S. Environmental ... , 861 F.2d 277 ( 1988 )

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