American Public Gas Association v. DOE ( 2022 )


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  •  United States Court of Appeals
    FOR THE DISTRICT OF COLUMBIA CIRCUIT
    Argued September 9, 2021             Decided January 18, 2022
    No. 20-1068
    AMERICAN PUBLIC GAS ASSOCIATION,
    PETITIONER
    v.
    UNITED STATES DEPARTMENT OF ENERGY,
    RESPONDENT
    AMERICAN GAS ASSOCIATION, ET AL.,
    INTERVENORS
    Consolidated with 20-1072, 20-1100
    On Petitions for Review of a Final Rule
    of the U.S. Department of Energy
    Barton Day argued the cause for petitioners Spire, Inc. and
    Spire Missouri, Inc. Stephanie Weiner argued the cause for
    petitioner Air-Conditioning, Heating, and Refrigeration
    Institute. With them on the joint briefs were John P. Gregg,
    William C. Simmerson, Scott Blake Harris, Jason Neal, and
    Daniel P. Tingley. Matthew J. Agen and Michael L. Murray
    entered appearances.
    2
    Jack Starcher, Attorney, U.S. Department of Justice,
    argued the cause for respondent. With him on the briefs were
    Brian M. Boynton, Acting Assistant Attorney General, and
    Michael S. Raab, Attorney.
    Michelle Wu argued the cause for respondent - intervenors.
    With her on the brief were Aaron Colangelo, Ian Fein, Letitia
    James, Attorney General, Office of the Attorney General for
    the State of New York, Patrick Woods, Assistant Solicitor
    General, Lisa S. Kwong, Assistant Attorney General, Matthew
    Rodriquez, Acting Attorney General, Office of the Attorney
    General for the State of California, David Zonana, Acting
    Senior Assistant Attorney General, Kwame Raoul, Attorney
    General, Office of the Attorney General for the State of Illinois,
    Daniel I. Rottenberg, Assistant Attorney General, Aaron M.
    Frey, Attorney General, Office of the Attorney General for the
    State of Maine, Katherine E. Tierney, Assistant Attorney
    General, Timothy D. Ballo, Brian Frosh, Attorney General,
    Office of the Attorney General for the State of Maryland, John
    B. Howard, Jr., Special Assistant Attorney General, Maura
    Healey, Attorney General, Office of the Attorney General for
    the Commonwealth of Massachusetts, Christophe Courchesne,
    Deputy Chief, Keith Ellison, Attorney General, Office of the
    Attorney General for the State of Minnesota, Peter Surdo,
    Special Assistant Attorney General, Aaron D. Ford, Attorney
    General, Office of the Attorney General for the State of
    Nevada, Heidi Parry Stern, Solicitor General, Gurbir S.
    Grewal, Attorney General, Office of the Attorney General for
    the State of New Jersey, Paul Youchak, Deputy Attorney
    General, Ellen F. Rosenblum, Attorney General, Office of the
    Attorney General for the State of Oregon, Steve Novick, Special
    Assistant Attorney General, Thomas J. Donovan, Jr., Attorney
    General, Office of the Attorney General for the State of
    Vermont, Nicholas Persampieri, Assistant Attorney General,
    3
    Karl A. Racine, Attorney General, Office of the Attorney
    General for the District of Columbia, and Loren L. AliKhan,
    Solicitor General. Gerald Karr, Assistant Attorney General,
    Office of the Attorney General for the State of Illinois, entered
    an appearance.
    Before: SRINIVASAN, Chief Judge, JACKSON, Circuit
    Judge, and GINSBURG, Senior Circuit Judge.
    Opinion for the Court filed by Senior Circuit Judge
    GINSBURG.
    GINSBURG, Senior Circuit Judge: The Energy Policy and
    Conservation Act authorizes the Secretary of Energy to set
    energy efficiency standards for certain commercial and
    industrial equipment. The Secretary may not, however,
    establish a standard more stringent than that promulgated by
    the American Society of Heating, Refrigerating and Air-
    Conditioning Engineers (ASHRAE) unless she has clear and
    convincing evidence the more stringent standard is
    economically justified, technically feasible, and will lead to
    significant conservation of energy.
    In January 2020, the Department of Energy published a
    Final Rule that set more stringent efficiency standards than
    those of the ASHRAE for “commercial packaged boilers,”
    large boilers commonly used to heat commercial and
    multifamily residential buildings.      Energy Conservation
    Program: Energy Conservation Standards for Commercial
    Packaged Boilers, 
    85 Fed. Reg. 1592
    . In these consolidated
    cases, the American Public Gas Association, the Air-
    Conditioning, Heating, and Refrigeration Institute, Spire Inc.,
    and Spire Missouri Inc. petition for review of the Final Rule,
    alleging numerous deficiencies with the rule. Because we are
    not persuaded it was reasonable for the Secretary to conclude
    4
    the Final Rule was supported by clear and convincing evidence,
    we remand the rule to the DOE to address several points raised
    by the petitioners within a limited time.
    I.      Background
    The Energy Policy and Conservation Act, as amended in
    1992, prescribes energy efficiency standards for certain
    commercial and industrial equipment. See 
    42 U.S.C. § 6313
    .
    It also authorizes the Secretary of Energy to amend a standard
    if certain conditions are met. See 
    id.
     § 6313(a)(6). The
    Congress tethered the Secretary’s amendment of a standard for
    equipment covered by Section 6313 to the internationally
    recognized standards promulgated by the ASHRAE, known as
    ASHRAE/IES Standard 90.1. Id. Specifically, if the ASHRAE
    amends Standard 90.1 for equipment covered by Section 6313,
    then the Secretary must at the least amend her standard
    correspondingly. Id. § 6313(a)(6)(A)(ii)(I). The Secretary
    may, however, instead adopt a more stringent standard if she
    determines by clear and convincing evidence that doing so (a)
    “would result in significant additional conservation of energy,”
    (b) is “technologically feasible” for the industry, and (c) is
    “economically justified,” id. § 6313(a)(6)(A)(ii)(II), in which
    case she must issue a rule establishing the more stringent
    standard within 30 months of ASHRAE’s publication of its
    amendment to Standard 90.1, id. § 6313(a)(6)(B)(i).
    In determining whether a more stringent standard is
    “economically justified,” the Secretary is required to consider
    “to the maximum extent practicable” (1) “the economic impact
    of the standard on the manufacturers and on the consumers of
    the products subject to the standard”; (2) “the savings in
    operating costs throughout the estimated average life of the
    product in the type (or class) compared to any increase in the
    price of, or in the initial charges for, or maintenance expenses
    5
    of, the products that are likely to result from the imposition of
    the standard” or, in other words, the difference in the life-cycle
    cost (LCC) of equipment with and without a more stringent
    standard; (3) “the total projected quantity of energy savings
    likely to result directly from the imposition of the standard”;
    and other factors not relevant here. Id. § 6313(a)(6)(B)(ii).
    As originally enacted, the statute authorized the Secretary
    to amend an energy efficiency standard for equipment covered
    by Section 6313 only in response to a corresponding
    amendment of Standard 90.1 by the ASHRAE. In 2007,
    however, the Congress added a “lookback” provision,
    providing that if the ASHRAE has not amended Standard 90.1
    for six years for a category of covered equipment, then the
    Secretary must evaluate whether a more stringent standard is
    necessary for that category of equipment.                Energy
    Independence and Security Act of 2007, Pub. L. 110-140,
    § 305(b), 
    121 Stat. 1554
     (codified at 
    42 U.S.C. § 6313
    (a)(6)(C)(i)). As all parties agree, however, even under
    the “lookback” provision, the Secretary may establish a more
    stringent standard only if she determines by clear and
    convincing evidence that the standard will result in significant
    conservation of energy, is technologically feasible, and is
    economically justified.       See 
    id.
     § 6313(a)(6)(C)(i)(II)
    (seemingly incorporating by reference the clear and convincing
    standard of § 6313(a)(6)(A)); see also Energy Conservation
    Program for Appliance Standards: Procedures for Use in New
    or Revised Energy Conservation Standards and Test
    Procedures for Consumer Products and Commercial/Industrial
    Equipment, 
    85 Fed. Reg. 8626
    , 8643 (2020) (noting that the
    plain language of the statute indicates the clear and convincing
    standard applies to the “lookback” provision).
    Commercial packaged boilers are covered by Section
    6313. 
    42 U.S.C. § 6311
    (1)(J). A commercial packaged boiler
    6
    is one that, among other things, has a rated input of at least 300
    kBtu/h and is used “for space conditioning and/or service water
    heating in buildings.” 
    10 C.F.R. § 431.82
    (1)-(2). The DOE
    categorizes packaged boilers based upon their size (small,
    large, and very large), the type of fuel they use (gas-fired or oil-
    fired), and their heating medium (hot water or steam). Thus,
    there are 12 categories of packaged boilers. 85 Fed. Reg. at
    1594.
    In July 2009, the DOE promulgated a Final Rule for
    commercial packaged boilers, adopting the ASHRAE’s 2007
    amendment to Standard 90.1. Energy Conservation Program
    for Certain Industrial Equipment: Energy Conservation
    Standards and Test Procedures for Commercial Heating, Air-
    Conditioning, and Water-Heating Equipment, 
    74 Fed. Reg. 36312
    . Since then, Standard 90.1 has been updated several
    times but never with respect to the efficiency standards for
    commercial packaged boilers.
    In 2016, the DOE, pursuant to the “lookback” provision,
    proposed new, more stringent energy efficiency standards for
    eight of the twelve categories of commercial packaged boilers.
    Energy Conservation Program: Energy Conservation
    Standards for Commercial Packaged Boilers (Proposed Rule),
    
    81 Fed. Reg. 15836
    . Based upon data it had gathered and
    analyzed, the DOE “tentatively concluded that there is,” as
    required, “clear and convincing evidence to support more
    stringent standards” for most types of commercial packaged
    boilers. Id. at 15838.
    In order to satisfy its statutory mandate to consider “the
    economic impact of the [proposed] standard … on the
    consumers of the products subject to the standard” and the
    difference in LCC savings the standard would bring about, 
    42 U.S.C. § 6313
    (a)(6)(B)(ii)(I)-(II), the DOE set out to compare
    7
    the LCC of equipment with and without an amended standard.
    The LCC of any piece of equipment is the sum of (a) the
    purchase price (including installation cost and sales tax) and
    (b) the lifetime cost of operating it (fuel, maintenance, and
    repair), discounted to present value.
    Conceptual simplicity belies operational complexity. The
    DOE had to construct a no-new-standards, or base, case and a
    new-standards case and compare the two. Construction of each
    case required the DOE to compile a representative sample of
    commercial and residential buildings, for which it used the
    Energy Information Administration’s 2012 Commercial
    Buildings Energy Consumption Survey (CBECS) and 2009
    Residential Energy Consumption Survey (RECS).
    Next, for both the base case and the new-standards case,
    the DOE had to assign boilers with specific efficiency levels to
    buildings. Assigning boilers in the base case is particularly
    tricky, as it involves predicting how the world would look
    without new standards. Historical shipping data provides the
    most accurate picture of the mix of boilers in a world without
    new standards, but the DOE had historical shipping data for
    only two of the eight relevant categories of boilers, so it
    assumed the distribution of efficiency levels in shipped
    equipment was the same as the distribution of efficiency levels
    among models listed in the database maintained by the AHRI.
    After accounting for the mix of efficiency levels in shipped
    boilers, the DOE assigned boilers to buildings randomly: An
    efficiency level associated with 30 per cent of the models listed
    in the AHRI data base had a 30 per cent chance of being
    selected for any given boiler/building combination.
    For both the base case and the new-standards case, the
    DOE also had to calculate the burner operating hours and the
    energy use of a given boiler in any boiler/building combination.
    8
    To this end, the DOE had to make assumptions about the heat
    load (the amount of heat energy per unit of time that is needed
    to maintain a certain temperature in a defined space) of the
    sample buildings, namely that for every square foot of heated
    area, a building uses an average of 30 Btu/h, and about the
    number and size of the boilers in those buildings. 85 Fed. Reg.
    at 1624.
    Finally, in order to estimate the operating cost associated
    with energy use for any given boiler/building combination, the
    DOE had to predict the cost of energy over the lifetime of the
    equipment, which the DOE assumed was 24.8 years. Id. at
    1594. For this, the DOE turned to the energy prices forecasted
    in the Energy Information Administration’s 2016 Annual
    Energy Outlook.
    During the period for comment on the proposed standards,
    many parties raised concerns regarding the DOE’s data and
    conclusions. Those relevant to the petitions for review are
    discussed in Part II below.
    In January 2020 the DOE published its Final Rule, which
    was, as relevant here, substantively equivalent to its Proposed
    Rule.      The DOE did, however, somewhat update its
    justification for the amended standards. Whereas the preamble
    to the Proposed Rule simply said the “lookback” provision
    demands clear and convincing evidence and the proposed
    standards satisfy that requirement, see 81 Fed. Reg. at 15837,
    the preamble to the Final Rule initially responded to comments
    questioning whether the heightened standard was satisfied by
    disputing their premise, claiming the “lookback” provision
    does not demand clear and convincing evidence. 85 Fed. Reg.
    at 1607. The preamble went on, however, to say “assuming
    that clear and convincing evidence is required here, DOE
    believes its findings fully satisfy that threshold.” Id. 1607-08.
    9
    The American Public Gas Association (APGA), the
    members of which are publicly owned gas distribution systems,
    petitioned for review of the Final Rule. That petition was
    consolidated with the petitions of the Air-Conditioning,
    Heating & Refrigeration Institute (AHRI), a trade association
    representing manufacturers of covered equipment, and of Spire
    Inc., an owner and operator of natural gas utilities, and its
    subsidiary Spire Missouri Inc., a natural gas utility. The
    American Gas Association, representing more than 200 local
    energy companies, intervened in support of the petitioners.
    The DOE agrees with the petitioners that the Final Rule is
    invalid but solely on the ground that the DOE failed to apply
    the clear and convincing standard required by statute; it urges
    the court not to reach the merits of the petitioners’ more
    specific challenges to the analysis supporting the rule, which it
    unhelpfully failed to address in its brief. Because the DOE
    refused to defend the legality of the Rule, 11 states, two
    municipalities, and four non-profit organizations intervened to
    do so. Furthermore, in contrast to the petitioners, who have
    consistently asked us to vacate the Final Rule, the DOE has
    revised its initial position and now seeks a remand without
    vacatur.
    II.     Analysis
    We have jurisdiction over these petitions for review
    pursuant to 
    42 U.S.C. §§ 6306
    (b)(1), 6316(a)(1). Under the
    Administrative Procedure Act, we must “hold unlawful and set
    aside agency action, findings, and conclusions found to be
    arbitrary, capricious … or otherwise not in accordance with
    law.” 
    5 U.S.C. § 706
    (2)(A). Agency action is arbitrary and
    capricious if a reviewing court cannot discern from the record
    that the agency action was the product of reasoned decision
    10
    making. Van Hollen, Jr. v. Fed. Election Comm’n, 
    811 F.3d 486
    , 495 (D.C. Cir. 2016). An agency has not engaged in
    reasoned decision making if it “entirely failed to consider an
    important aspect of the problem,” Motor Vehicle Mfrs. Ass’n of
    U.S., Inc. v. State Farm Mut. Auto. Ins. Co., 
    463 U.S. 29
    , 43
    (1983), or if it did not “engag[e] the arguments raised before
    it,” NorAm Gas Transmission Co. v. F.E.R.C., 
    148 F.3d 1158
    ,
    1165 (D.C. Cir. 1998).
    A. Clear and Convincing Evidence Standard
    There is a further wrinkle to rulemaking under the
    “lookback” provision. All parties now agree the Secretary is
    not authorized to establish a more stringent efficiency standard
    for commercial packaged boilers under the “lookback”
    provision unless there is clear and convincing evidence that the
    standard would result in significant additional conservation of
    energy, would be technologically feasible, and is economically
    justified. See § 6313(a)(6)(C)(i)(I)-(II) (incorporating the
    criteria set forth in § 6313(a)(6)(A)-(B) for the Secretary’s
    review occasioned by an amendment by the ASHRAE to
    Standard 90.1).
    The requirement of “clear and convincing evidence” as a
    prerequisite to informal rulemaking is unusual, perhaps unique;
    we are aware of no other authorization for rulemaking subject
    to this heightened evidentiary standard. The standard is
    familiar, however, from other areas of the law: clear and
    convincing evidence requires a factfinder (in this case the
    Secretary) to have an “abiding conviction” that her findings (in
    this case that a more stringent standard would result in
    significant additional conservation of energy, would be
    technologically feasible, and is economically justified) are
    “highly probable” to be true. Colorado v. New Mexico, 
    467 U.S. 310
    , 316 (1984).
    11
    This unusual framework creates an unusually strong bias
    in favor of the status quo: The DOE may not establish a more
    stringent standard unless it clears the heightened evidentiary
    hurdle established by the Congress. The statute, it is true,
    requires the Secretary to consider a list of factors only “to the
    maximum extent practicable” when determining whether a
    more stringent standard is “economically justified,” 
    42 U.S.C. § 6313
    (a)(6)(B)(i), but the phrase “to the maximum extent
    practicable” does not modify the clear and convincing evidence
    requirement; it modifies only the requirement to consider
    specific factors. What it means, therefore, is that if it is
    impracticable for the DOE to consider further one or more of
    the enumerated factors, but there is clear and convincing
    evidence based upon the other factors, then the Secretary may
    promulgate a more stringent standard.
    The Respondent-Intervenors argue instead that “the
    agency is required to … conclude whether the standards are
    economically justified by clear and convincing evidence but
    only to the maximum extent practicable.” Oral Argument at
    1:09:01. This conflates the nonnegotiable evidentiary standard
    with the specific factors DOE must consider in determining
    whether that standard has been met. Difficulty in satisfying the
    clear and convincing standard is not a justification for ignoring
    it.
    Even where clear and convincing evidence is required
    before an agency can act, however, judicial review of agency
    action remains deferential. The court asks itself only whether
    it was reasonable for the agency to determine it met the
    standard. Sea Island Broad. Corp. of S.C. v. F.C.C., 
    627 F.2d, 240
    , 244 (D.C. Cir. 1980); Mo. Pub. Serv. Comm’n v. Fed.
    Energy Regul. Comm’n, 
    864 F.3d 589
    , 590 n.1 (Millett, J.,
    concurring).
    12
    B. Challenges to the Final Rule
    The petitioners’ most meritorious challenges to the Final
    Rule target the assumptions and data the DOE used to conclude
    that more stringent efficiency standards were economically
    justified by clear and convincing evidence. Before turning to
    those challenges, however, we pause briefly to dispose of two
    other intertwined challenges: (1) that the DOE — in
    contravention of its statutory mandate — did not in fact apply
    the clear and convincing evidentiary standard; and (2) that the
    DOE did not provide proper notice and explanation, as required
    by the Administrative Procedure Act, see Envtl. Integrity
    Project v. E.P.A., 
    425 F.3d 992
    , 998 (D.C. Cir. 2005) (notice)
    and Physicians for Soc. Responsibility v. Wheeler, 
    956 F.3d 634
    , 644 (D.C. Cir. 2020) (explanation), when it departed from
    agency precedent by holding the “lookback” provision does not
    demand clear and convincing evidence.
    1. Whether the DOE applied the clear and convincing
    standard
    The petitioners and the DOE itself argue the rulemaking is
    fatally flawed because the DOE did not apply the clear and
    convincing evidence standard required by statute. They point
    to the DOE’s initial response to questions about its claim to
    have clear and convincing evidence, when it said the
    “lookback” provision is not subject to the clear and convincing
    standard. Any mentions in the preamble to the Final Rule of
    the clear and convincing standard should be disregarded, the
    petitioners’ argument goes, as not embodying the agency’s
    “express and considered conclusion.”
    We reject this argument summarily. In promulgating the
    Final Rule, the DOE expressly said satisfaction of the clear and
    13
    convincing standard, if applicable, was an alternative ground
    supporting the Rule. See 85 Fed. Reg. at 1607-08 (“assuming
    that clear and convincing evidence is required here, DOE
    believes its findings fully satisfy that threshold”). The DOE
    then continued with a lengthy analysis of what the clear and
    convincing standard requires. Id. at 1608; see also id. at 1606,
    1674 (stating the clear and convincing standard had been met).
    Thus, the preamble to the Final Rule provides ample evidence
    that this alternative ground embodied the agency’s “express
    and considered conclusion.” In any event, judicial review does
    not authorize the court to rewrite the decision being challenged,
    nor to disregard what the agency clearly said.
    Relatedly, the petitioners argue the Final Rule is unlawful
    because (a) the DOE departed without acknowledging or
    distinguishing its precedent and practice of interpreting the
    statute as requiring clear and convincing evidence for
    rulemaking under the “lookback” provision; and (b) the DOE
    failed to provide notice of its plan to abandon this long-held
    position. Because we have just rejected the premise of this
    argument, nothing more need be said about it.
    2. Challenges to the DOE’s Conclusion that More
    Stringent Standards are Economically Justified
    The remaining challenges to the Final Rule focus upon
    various aspects of the DOE’s determination that more stringent
    efficiency standards are economically justified.
    a. Random assignment of boilers to buildings
    As described above, in conducting the LCC analysis, the
    DOE had to and did describe the world as it would be if the
    agency issued no new standards and then compared that world
    to a world with new standards. In constructing the no-new-
    14
    standards case, the DOE assumed the distribution of
    efficiencies among shipped boilers is the same as the
    distribution of efficiencies across the models listed in the AHRI
    data base. As a result, when the DOE ran trials randomly
    assigning boilers to buildings in the no-new-standards case, the
    chance a boiler with a certain efficiency level would be
    assigned to a building in the sample was equal to the percentage
    of boilers in the AHRI database with that efficiency level,
    without regard to the characteristics of the building to which
    the boiler was assigned.
    Therefore, although the assignment of boilers to a
    building was not completely random, as it accounted for the
    relative prevalence of efficiency levels among boilers, it did not
    account for the type of building to which boilers were assigned.
    This means, the petitioners point out, the DOE failed to
    recognize that a purchaser of commercial packaged boilers
    would rationally consider the costs and benefits of its
    investment and is likely to buy the boiler that produces the best
    economic performance for its building. Indeed, it is difficult to
    believe purchasers of commercial packaged boilers, which are
    often large, sophisticated businesses, do not account for life-
    cycle costs when making a purchase. Random assignment, the
    petitioners contend, elides this reality. If a purchaser selects
    the most efficient unit for its building, then the DOE’s model
    will assign the benefits of that choice to its rule, rather than
    attributing it, correctly, to the purchaser’s rational decision
    making. As a result, the petitioners argue, the DOE inflated the
    economic value of a more stringent standard by attributing to a
    new regulation economic benefits that would be realized even
    without a new regulation.
    Responding in the Final Rule to comments raising this
    concern, the DOE rather dismissively noted that “development
    of a complete consumer choice model, to support an alternative
    15
    to random assignment in the no-new-standards case, for boiler
    efficiency would require data that are not currently available,
    as well as recognition of the various factors that impact the
    purchasing decision.” 85 Fed. Reg. at 1638. In a later section
    meant to justify the rule under Executive Orders 12866 and
    13563, the DOE lists several possible market failures as
    “problems that this standards [sic] address, id. at 1676, but the
    DOE provided not actual evidence that these market failures
    affect the market for commercial packaged boilers and thus
    justify the assumptions that underly its analysis.
    The assignment of efficiencies to the buildings in the
    sample was a crucial part of the analysis supporting the DOE’s
    conclusion that a more stringent standard was warranted. The
    significant concerns the petitioners raised about this
    assignment therefore demand a more complete response.
    Instead of producing evidence of some market failure in this
    specific market, the DOE essentially said it did the best it could
    with the data it had. This is not enough to justify assuming a
    purchaser’s decisions will not align with its economic interests
    in purchasing a boiler. Indeed, the DOE’s lackadaisical
    response would have been inadequate even if the rulemaking
    were not governed by a heightened evidentiary standard, for
    the DOE’s failure to “engage the arguments raised before it,”
    Del. Dep’t of Natural Res. & Envtl. Control v. EPA, 
    785 F.3d 1
    , 11, 13-14 (D.C. Cir. 2015), bespeaks a failure to consider an
    “important aspect of the problem,” State Farm, 
    463 U.S. at 43
    .
    At any rate, the DOE’s response certainly is problematic under
    the heightened standard requiring clear and convincing
    evidence. Without a cogent and reasoned response to the
    substantial concerns the petitioners raised about this crucial
    part of its analysis, we cannot say it was reasonable for the
    DOE to conclude that clear and convincing evidence supports
    the adoption of a more stringent standard.
    16
    b. Fuel prices
    The petitioners also challenge the DOE’s LCC analysis
    insofar as it involves predicting energy prices. Accurate energy
    prices are indispensable to the LCC analysis because fuel costs
    are a large part of the life-cycle cost of a boiler.
    In order to estimate future energy prices, the DOE began
    with historical price data from the Energy Information
    Administration for various geographic areas, which it then
    multiplied by forecasted fuel price indices derived from the
    Energy Information Administration’s Annual Energy Outlook
    2016. For electricity and natural gas prices, the DOE then
    applied “seasonal marginal price factors” to obtain marginal
    fuel prices, which it said better represent the cost to the
    consumer of changes in energy consumption. For oil, however,
    the DOE used the average prices, because it did not have
    sufficient data to convert average prices into marginal prices.
    According to the petitioners, the average prices the DOE
    used do not reflect the marginal prices paid by purchasers of
    commercial packaged boilers.             Because operators of
    commercial packaged boilers are among the largest purchasers
    of fuel from energy utilities, they receive volume discounts and
    enter into hedging contracts, and therefore pay significantly
    less. Consequently, by using predicted average energy prices
    to compare the LCC of boilers with and without a heightened
    efficiency standard, the DOE significantly overstated the
    savings associated with promulgation of a stricter standard.
    The DOE responded that the data sets it used “are the best
    aggregate sources for energy prices currently available” and it
    “incorporate[d] many adjustment factors to the average price
    data and the price trend data to account for the price differences
    17
    due to variations in locations, seasons, and market sectors and
    to ensure that the energy prices are properly accounted for in
    the economic analysis.” 85 Fed. Reg. at 1632.
    This response is conclusory, not explanatory. The DOE
    never explained how its “adjustment factors” address the
    specific concerns raised by the petitioners, which are not about
    “locations, seasons, [or] market sectors.” The DOE points us
    to the Technical Support Document, which lays out the DOE’s
    methodology for calculating energy prices. That document
    correctly states: “Because marginal prices reflect a change in a
    consumer’s bill associated with a change in energy consumed,
    such prices are appropriate for determining energy cost savings
    associated with possible changes to efficiency standards.” In
    keeping with that insight, we are told “[m]onthly electricity and
    natural gas prices were adjusted using seasonal marginal price
    factors to determine monthly marginal electricity and natural
    gas prices.” None of this addresses the lower prices for fuel
    allegedly paid by those who operate commercial packaged
    boilers. Perhaps the DOE could provide a cogent response to
    the concerns raised by the petitioners, but we cannot discern it
    in the administrative record. Therefore, we cannot say the
    Secretary reasonably concluded she had clear and convincing
    evidence a more stringent efficiency standard is economically
    justified.
    c.   Burner operating hours
    The petitioners also challenge the DOE’s estimates for
    burner operating hours. Burner operating hours are crucial for
    the LCC analysis because the operating cost of a boiler
    depends, in large part, upon the number of hours its burner
    operates. The DOE did not have direct data about burner
    operating hours for its no-new-standard case, so it estimated
    them based upon building data from CBECS and RECS and
    18
    assumptions about heat load, including the adoption of a rule
    of thumb that for every square foot of heated area, a building
    uses 30 Btu/h.
    Once again, the Technical Support Document provides a
    lengthy description of the method by which the DOE estimated
    burner operating hours, and once again, questions went
    unanswered. During the comment period, a consultant for
    AHRI pointed to several purported anomalies in the DOE’s
    estimates. Specifically, he said “[c]ommercial buildings are
    generally cooling load dominated so it would be highly unusual
    to have one thousand system operating hours per year,” yet
    according to DOE’s estimates, the median burner operating
    hours for six of eight categories of burners was more than 1000
    hours, the 90th percentile of two of the eight categories was
    more than 2000 operating hours, and the maximum burner
    operating hours in all categories was well over 2000 hours.
    Further, DOE “surprisingly,” he said, estimated that the
    median, 90th percentile, and maximum burner hours for large
    boilers are lower than the median, 90th percentile, and
    maximum burner hours for small boilers of the same type.
    These results, the consultant argued, should have alerted the
    DOE to the possibility that either its assumption about heat load
    or the data from CBECS were faulty.
    The DOE twice acknowledged these comments in the
    Final Rule document but did not respond to them. Rather, the
    DOE reiterated that it “has high confidence that its building
    load estimation is representative of the building loads in the
    field,” though it gave no reason for that confidence. 85 Fed.
    Reg. at 1624. Perhaps more telling, it explained that “DOE has
    not identified a source of comprehensive burner operating hour
    data for commercial boilers that could be used for such an
    analysis nor was such identified to DOE by stakeholders.” Id.
    at 1637. Using data ill-suited to the task is not excused by
    19
    failure — even good faith failure — to locate suitable data,
    particularly considering that the Congress here required clear
    and convincing evidence before the Secretary can disturb the
    regulatory status quo.
    By no stretch was this an exemplar of reasoned decision
    making. A commenter pointed to seeming anomalies in the
    DOE’s data and the agency ignored them. We need not decide
    whether this omission would, on its own, be sufficient to say
    the Secretary could not reasonably conclude she had clear and
    convincing evidence to support a new standard. Because the
    Final Rule has other deficiencies, however, we expect on
    remand a reasoned response to these concerns as well.
    d. Proxy for shipment data
    The last challenge to the Final Rule relates to the DOE’s
    proxy for shipment data. All agree direct shipment data are
    optimal. In the absence of such data for six of the eight
    categories of commercial packaged boilers, however, the DOE
    turned to publicly available model listings as a proxy for
    shipments. If 30 per cent of model listings had a certain energy
    efficiency, then the DOE assumed that the same percent of
    shipments had that efficiency.
    During the comment period, manufacturers argued that the
    distribution of efficiencies in model listings is not an adequate
    proxy for the distribution of efficiencies in sales. Responding
    in the preamble to the Final Rule, the DOE defended its proxy
    in two ways. First it said model listings likely approximate
    shipments because “[i]n general, manufacturers are likely to
    offer models with rated inputs and efficiencies where demand
    is highest.” 85 Fed. Reg. at 1635. Second, the DOE noted that
    AHRI had provided historical shipment information for two
    categories of boilers, and the differences between the proxy
    20
    data and the shipment information for these two categories
    turned out to be minimal. Id.
    Although the rationale of the DOE’s first point is not
    entirely clear, its second point vindicates its position and is
    powerful enough to carry the day. Even when clear and
    convincing evidence is required, there is no bar to relying upon
    a hypothesis that has been empirically validated, here by the
    comparison between the proxy data and the shipment data
    AHRI had provided for two of the eight types of boilers.
    Especially considering the conclusory nature of the petitioners’
    challenge to the proxy data — they provided no evidence of the
    degree to which any inaccuracy might affect the DOE’s
    calculations and conclusions — the DOE’s response was
    adequate. The reasonableness of the DOE’s reliance upon the
    proxy data is magnified when one considers that the AHRI has
    historical shipment data for all relevant categories of packaged
    boilers but refused to share them with the agency, a point made
    by the Respondent-Intervenors that the petitioners did not
    dispute in their Reply Brief. The upshot is that we cannot say
    the use of the proxy data, on its own, made it unreasonable for
    the Secretary to conclude a more stringent standard was
    supported by clear and convincing evidence.
    III. The Remedy
    What remains is the matter of a proper remedy. Although
    “vacatur is the normal remedy” when a rule is found unlawful,
    Allina Health Servs. v. Sebelius, 
    746 F.3d 1102
    , 1110 (D.C.
    Cir. 2014), we have long recognized that remand without
    vacatur is a useful arrow in a court’s remedial quiver. See
    Checkosky v. S.E.C., 
    23 F.3d 452
    , 462-65 (D.C. Cir. 1994). In
    Allied-Signal, Inc. v. Nuclear Regulatory Commission, we said
    “the decision whether to vacate depends on the seriousness of
    the order’s deficiencies (and thus the extent of doubt whether
    21
    the agency chose correctly) and the disruptive consequences of
    an interim change that may itself be changed.” 
    988 F.2d 146
    ,
    150-51 (1993) (internal quotations omitted).
    The pragmatic benefits of remand without vacatur,
    properly deployed, are undeniable. An open-ended remand
    without vacatur, however, can create a new problem: The
    agency may have little or no incentive to fix the deficient rule.
    Both common sense and the empirical literature confirm this.
    See Kristina Daugirdas, Note, Evaluating Remand Without
    Vacatur: A New Judicial Remedy for Defective Agency
    Rulemakings, 
    80 N.Y.U. L. Rev. 278
    , 301-05 (2005)
    (cataloguing extreme examples of agency inaction following
    remand without vacatur). Therefore, it may sometimes be
    prudent to require an agency to fix a deficient rule by a time
    certain, at which the rule will automatically be vacated. See In
    re Core Commc’ns, Inc., 
    531 F.3d 849
    , 862 (Griffith, J.,
    concurring) (D.C. Cir. 2008) (urging future panels to consider
    alternatives to open-ended remand without vacatur); A.L.
    Pharma, Inc. v. Shalala, 
    62 F.3d 1484
    , 1492 (D.C. Cir. 1995)
    (ordering automatic vacatur if agency does not provide
    adequate justification within 90 days).
    We think remanding the Final Rule to the DOE to
    reevaluate it within a limited time is the proper remedy here.
    The deficiencies of the rule may fairly be characterized as
    failures to explain, the type of deficiency most readily
    remedied on remand. In its supplemental brief, the DOE
    represents that it “expects on remand that it will be able to
    provide a full and sound explanation why the Rule’s standards”
    — which are slated to go into effect in January 2023 — “satisfy
    the clear and convincing evidence standard.” Under these
    circumstances, we think it should be afforded a limited
    opportunity to do so.
    22
    Therefore, we shall remand the Final Rule to the DOE for
    the agency to take appropriate remedial action within 90 days.
    If the DOE fails to do so, the Final Rule will automatically be
    vacated unless the agency demonstrates within ten days of the
    issuance of this decision the need for additional time.
    IV.     Conclusion
    For the foregoing reasons, the Final Rule is remanded to
    the DOE, as explained above.