Sierra Club—Grand Canyon Chapter v. Arizona Corp. Commission , 237 Ariz. 568 ( 2015 )


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  •                                 IN THE
    ARIZONA COURT OF APPEALS
    DIVISION ONE
    SIERRA CLUB – GRAND CANYON CHAPTER,
    Plaintiff/Appellee,
    v.
    ARIZONA CORPORATION COMMISSION,
    Defendant/Appellant.
    No. 1 CA-CV 14-0003
    FILED 7-23-2015
    Appeal from the Superior Court in Maricopa County
    No. LC2012-000470-001
    The Honorable Crane McClennen, Judge
    REVERSED
    COUNSEL
    Arizona Center for Law in the Public Interest, Phoenix
    By Timothy M. Hogan, Joy Herr-Cardillo
    Counsel for Plaintiff/Appellee
    Arizona Corporation Commission, Legal Division, Phoenix
    By Wesley C. Van Cleve, Charles H. Hains, Janet F. Wagner
    Counsel for Defendant/Appellant
    Curtis Goodwin Sullivan Udall & Schwab, PLC, Phoenix
    By William P. Sullivan, Trish Stuhan
    Counsel for Amicus Curiae Reclamation Power Group, LLC
    SIERRA CLUB v. AZCC
    Opinion of the Court
    OPINION
    Judge Patricia A. Orozco delivered the opinion of the Court, in which
    Presiding Judge Samuel A. Thumma and Judge Michael J. Brown joined.
    O R O Z C O, Judge:
    ¶1            This appeal concerns the development of a proposed “waste-
    to-energy” (WTE) facility, which would generate electricity by burning
    landfill waste, and the classification of electrical power that would be
    produced by the proposed facility. The Arizona Constitution grants the
    Arizona Corporation Commission (the Commission) broad power to
    “prescribe just and reasonable” classifications and rates for services
    rendered by public service corporations. Ariz. Const. art. 15, § 3. We
    review the scope of that authority and the deference due a Commission
    decision, later vacated by the superior court, granting approval for the
    proposed WTE facility. For the reasons that follow, we reverse the superior
    court’s decision and reinstate the Commission’s decision to the extent it
    grants an application by Mohave Electric Cooperative, Inc. (Mohave) for a
    waiver to the Renewable Energy Standard and Tariff (REST) rules.
    FACTS AND PROCEDURAL BACKGROUND
    ¶2            Arizona public utility corporations providing electricity are
    subject to the REST rules promulgated in Arizona Administrative Code
    (A.A.C.) sections R14-2-1801, et seq.      These rules require affected
    corporations “to satisfy an Annual Renewable Energy Requirement by
    obtaining Renewable Energy Credits [(Credits)] from Eligible Renewable
    Energy Resources.” A.A.C. R-14-2-1804.A. A Credit is obtained for each
    kilowatt-hour “derived from an Eligible Renewable Energy Resource.”
    A.A.C. R14-2-1803.A. Although specific Eligible Renewable Energy
    Resources are listed in the rules, the Commission “may adopt pilot
    programs in which additional technologies are established as Eligible
    Renewable Energy Resources.” A.A.C. R14-2-1802.D. The Commission
    also “may waive compliance with any provision of [the REST rules] for
    good cause.” A.A.C. R14-2-1816.A.
    ¶3            Mohave filed an application asking the Commission to either
    (1) recognize a proposed WTE facility as a “pilot program,” or (2) waive the
    REST rules for the proposed facility “to the limited extent necessary to
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    SIERRA CLUB v. AZCC
    Opinion of the Court
    recognize energy produced [by the] facility as an ‘Eligible Renewable
    Energy Resource.’” Mohave’s application stated that Reclamation Power
    Group, LLC (RPG), which intended to develop, own, and operate the
    proposed WTE facility in Maricopa County, could not provide
    “economically viable” power unless the Commission classified the
    municipal solid waste that would be used as fuel by the facility as a Credit-
    eligible “Renewable Energy Resource.” Appellee, Sierra Club – Grand
    Canyon Chapter (Sierra Club) successfully intervened to oppose Mohave’s
    application.
    ¶4            The Commission’s Utilities Division (Staff) produced a report
    on Mohave’s application and drafted a recommended decision. The report
    stated that Mohave had provided Staff with a “breakdown, by category” of
    a waste sample from a landfill that Mohave claimed was representative of
    the waste composition the WTE facility would burn as fuel if the facility
    became operational. The report discussed how the Mohave “breakdown”
    showed ninety-five percent of the waste consisted of “biogenic material.”1
    The Staff report concluded that burning waste of this composition would
    mean “the biogenic material contributes about [ninety-one] percent of the
    energy to the process while non-biogenic materials contribute about [nine]
    percent[.]” The report suggested that the ninety-one percent figure was
    high in relation to the results of other studies. As a result, Staff
    recommended that the Commission not grant “pilot program” status and
    instead grant a good-cause waiver of the REST rules to allow seventy-five
    percent of the kilowatts produced by the facility to be Credit-eligible “as
    being produced by an Eligible Renewable Energy Resource.”
    ¶5            Both Mohave and Sierra Club filed exceptions to the Staff
    recommendation. Following an open meeting, the Commission held a
    three-day evidentiary hearing before an administrative law judge (ALJ).
    Seven witnesses testified, including representatives from Staff and acting
    President of RPG Ronald Blendu. Following the evidentiary hearing, the
    Commission adopted most of the Staff findings and recommended
    decision, with two important changes: the Commission (1) granted the WTE
    facility “pilot program” status under the REST rules, noting that
    “[a]lthough we disagree with Staff that a waiver of the REST Rules is
    1      The REST rules do not define “biogenic,” but they define somewhat
    related words such as “biomass,” which is “any raw or processed plant-
    derived organic matter available on a renewable basis[.]” A.A.C. R14-2-
    1802.A.2.; cf. The American Heritage Dictionary of the English Language
    183 (5th ed. 2011) (defining “biogenic” as “[p]roduced by living organisms
    or biological processes.”).
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    SIERRA CLUB v. AZCC
    Opinion of the Court
    necessary to approve [Mohave’s] application . . . we recognize and
    acknowledge that Staff’s analysis . . . provides an independent and
    alternative basis upon which to approve this application[,]”and (2) granted
    Credits for ninety percent of the kilowatt hours that would be produced by
    the facility.
    ¶6             Sierra Club petitioned for a rehearing, which the Commission
    granted. Another evidentiary hearing was held, with extensive testimony
    from several witness, once again including representatives from Staff and
    Ronald Blendu. Following the rehearing, the Commission affirmed its
    initial decision “in its entirety.” The Commission denied Sierra Club’s
    petition for rehearing on that decision.
    ¶7            Sierra Club then sought review of the Commission’s decision
    in superior court pursuant to Arizona Revised Statutes (A.R.S.) section 40-
    254 (West 2015).2 Sierra Club and the Commission requested judgment on
    the record created before the Commission. Following briefing and oral
    argument, the superior court vacated the Commission’s decision, stating
    that “the authorities and arguments provided by [Sierra Club] are well-
    taken, and this Court adopts those authorities and arguments in support of
    its decision.” The superior court further awarded Sierra Club its attorney
    fees and costs. After entry of judgment by the superior court, this timely
    appeal followed. We have jurisdiction pursuant to A.R.S. § 12-2101.B. (West
    2015).
    DISCUSSION
    I.    Appropriate Standards of Proof and Review
    ¶8           The Commission first contends that its constitutional
    ratemaking authority entitled its decision to a more deferential standard of
    review than it received from the superior court. Additionally, the
    Commission argues that the superior court erred by applying ambiguous
    standards of proof and review. The proper standards of proof and review
    for challenges to Commission decisions are legal questions we review de
    novo. See Tucson Elec. Power Co. v. Ariz. Corp. Comm’n., 
    132 Ariz. 240
    , 242-
    44 (1982).
    ¶9          The Commission occupies a unique place in Arizona’s
    government, with our state constitution expressly stating the Commission’s
    purpose and powers. See generally Ariz. Const. art. 15. Our supreme court
    2     We cite the current version of applicable statutes when no revisions
    material to this decision have since occurred.
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    SIERRA CLUB v. AZCC
    Opinion of the Court
    has described the Commission as “another department of government,
    with powers and duties as well defined as any branch[.]” State v. Tucson
    Gas, Elec. Light & Power Co., 
    15 Ariz. 294
    , 306 (1914); see also Ariz. Corp.
    Comm’n v. State ex rel. Woods, 
    171 Ariz. 286
    , 290 (1992) (recognizing that
    “[t]he [Arizona Constitution’s] framers established the Commission as a
    separate, popularly-elected branch of state government”). This special
    status makes the judicial review process for the Commission’s decisions
    distinct from the process for reviewing other administrative decisions,
    although they share many similarities. See Tucson Elec. Power Co., 
    132 Ariz. at 243
    ; compare A.R.S. § 12-905.A. (West 2015) with A.R.S. § 40-254.A (West
    2015).
    ¶10            A further distinction exists concerning the scope of judicial
    review for Commission decisions. As set forth in Tucson Electric Power
    Company, a court’s de novo review is “limited” when the reviewing court is
    examining a ratemaking decision. 
    132 Ariz. at 243-44
    . Here, Sierra Club
    asserts that the Commission’s ratemaking authority is limited to particular
    elements, none of which apply to decisions about “pilot programs” or
    waivers under the REST rules. But Arizona case law has not restricted
    “ratemaking” as such. See Woods, 
    171 Ariz. at 294
     (concluding that “even
    assuming we restrict the Commission’s regulatory power to its ratemaking
    function, we must give deference to the Commission’s determination of
    what regulation is reasonably necessary for effective ratemaking”). Indeed,
    this court recently concluded that the Commission promulgated the REST
    rules pursuant to its ratemaking power. See Miller v. Ariz. Corp. Comm’n.,
    
    227 Ariz. 21
    , 29, ¶ 33 (App. 2011). Sierra Club contends that the court’s
    holdings in Miller are inapposite because that case concerned a collateral
    attack on the Commission’s power to enact the regulations. It follows,
    however, that rules enacted under the Commission’s ratemaking power are
    also reviewable under the standards for reviewing ratemaking decisions.
    As a result, we conclude the Commission decision here was made under
    the Commission’s ratemaking power. We now turn to the appropriate
    standards of proof and review for ratemaking cases.3
    3      We find unavailing Sierra Club’s argument that it is “abundantly
    clear” that challenging a Commission ratemaking decision must be done as
    a direct appeal to the Court of Appeals pursuant to A.R.S. § 40-254.01.
    Although this court has interpreted A.R.S. § 40-254.01 as limiting direct
    appeals to this court to ratemaking decisions by the Commission, that
    opinion does not conclude that all challenges to Commission ratemaking
    decisions must be brought pursuant to § 40-254.01. See Arizona-American
    Water Co. v. Ariz. Corp. Comm’n, 
    209 Ariz. 189
    , 191, ¶ 10 (App. 2004).
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    SIERRA CLUB v. AZCC
    Opinion of the Court
    ¶11           The applicable standard in reviewing a Commission decision
    is found in A.R.S. § 40-254.E., which provides that “[i]n all trials, actions
    and proceedings the burden of proof shall be upon the party adverse to the
    [C]ommission or seeking to vacate or set aside any determination or order
    of the [C]ommission to show by clear and satisfactory evidence that it is
    unreasonable or unlawful.” The Arizona Supreme Court has provided
    guidance on how the superior court should review a ratemaking decision
    under § 40-254. First, the superior court must conduct a “limited” de novo
    review via a new trial to give the parties an opportunity to present new
    evidence. See Tucson Elec. Power Co., 
    132 Ariz. at 243
    . In considering the
    evidence presented to the Commission, however, “[t]he [s]uperior [c]ourt
    may not reweigh the evidence and substitute its judgment for that of the
    Commission, but may disturb the Commission’s rate decision only if it is not
    reasonably supported by the evidence, is arbitrary, or is otherwise
    unlawful.” 
    Id.
     (emphasis added; internal citation omitted). After the
    superior court reviews a Commission decision, “an appellate court reviews
    the [s]uperior [c]ourt’s decision and not the Commission’s[.]” 
    Id. at 244
    . If
    the superior court’s decision “disturbed” the Commission’s, the appellate
    court examines the superior court’s “contrary conclusions to see if they are
    supported by clear and satisfactory evidence.” 
    Id.
     “Clear and satisfactory
    evidence” is the same as “clear and convincing evidence” and is a higher
    burden than preponderance of evidence. 
    Id. at 243
    .
    ¶12           Even under a “limited” de novo review, the court is not
    bound by the Commission’s legal conclusions, and a reviewing court must
    “determine independently whether the Commission erred in its
    interpretation of the law.” Babe Invs. v. Ariz. Corp. Comm’n, 
    189 Ariz. 147
    ,
    150 (App. 1997). The Commission’s factual determinations, however, are
    entitled to deference and the superior court “is not free to overturn [them]
    unless the plaintiff demonstrates by ‘clear and convincing evidence’ that
    the Commission’s determination is unreasonable.” Grand Canyon Trust v.
    Ariz. Corp. Comm’n, 
    210 Ariz. 30
    , 34, ¶ 11 (App. 2005) (citing Tucson Elec.
    Power Co., 
    132 Ariz. at 243-44
    ).
    II.   The Superior Court’s Judgment
    ¶13          In entering judgment in favor of Sierra Club, the superior
    court made the following determinations:
    1. The Corporation Commission's [REST] rules do not allow
    [m]unicipal [s]olid [w]aste . . . as an eligible renewable energy
    resource and, therefore, waste-to-energy facilities using
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    SIERRA CLUB v. AZCC
    Opinion of the Court
    [municipal solid waste] are not eligible as a pilot program
    under the rules;
    2. The proposed [WTE] facility does not qualify for a waiver
    from the requirements of the REST rules because good cause
    was not established for a waiver and a waiver would be
    inconsistent with the exclusion of [municipal solid waste] as
    an eligible renewable resource under the rules; and
    3. There was no credible evidence to support the
    Commission's determination that 90% of the electricity from
    the proposed [WTE] facility would come from biogenic
    sources.
    We analyze these conclusions in turn.
    A.     The Superior Court’s Interpretation of the REST Rules
    ¶14           The superior court’s first two conclusions construe and
    interpret the REST rules. We therefore review them de novo to the extent
    necessary to resolve this appeal. See BNSF Ry. Co. v. Ariz. Corp. Comm’n,
    
    228 Ariz. 481
    , 485, ¶ 12 (App. 2012) (observing Court of Appeals “can draw
    our own legal conclusions” in reviewing the superior court’s review of a
    Commission decision); Libra Grp., Inc. v. State, 
    167 Ariz. 176
    , 179 (App. 1991)
    (noting “applicable statutes and regulations” are reviewed de novo).
    However, because we conclude good cause was established for a waiver of
    the REST rules, we need not determine as a matter of law whether the REST
    rules preclude pilot program status for WTE facilities that use municipal
    solid waste. See KZPZ Broad., Inc. v. Black Canyon City Concerned Citizens,
    
    199 Ariz. 30
    , 38, ¶¶ 28-29 (App. 2000) (noting that a dispositive holding on
    one issue may preclude appellate review of other presented issues).
    ¶15            As previously noted, the REST rules require affected utility
    corporations “to satisfy an Annual Renewable Energy Requirement by
    obtaining [Credits] from Eligible Renewable Energy Resources.” A.A.C.
    R14-2-1804.A. The rules generally define “Eligible Renewable Energy
    Resources” as “applications of . . . technologies that displace Conventional
    Energy Resources that would otherwise be used to provide electricity to an
    Affected Utility’s Arizona customers[.]”         A.A.C. R14-2-1802.A.     A
    “Conventional Energy Resource” is defined as “an energy resource that is
    non-renewable in nature, such as natural gas, coal, oil, and uranium, or
    electricity that is produced with energy resources that are not Renewable
    Energy Resources.” A.A.C. R14-2-1801.C. By express provision in the REST
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    SIERRA CLUB v. AZCC
    Opinion of the Court
    rules, “[t]he Commission may waive compliance with any provision of [the
    REST rules] for good cause.” A.A.C. R14-2-1816.A.
    ¶16          Sierra Club asserts the superior court correctly found that
    good cause for a waiver was not established. More specifically, Sierra Club
    argues that Mohave never claimed it needed a waiver because it cannot
    comply with the REST rules and the good cause exception should be
    construed narrowly to prevent the exception from “swallow[ing] the rule.”
    ¶17             Whether good cause exists for a waiver is a case-by-case
    determination that “depends on the particular circumstances . . . and
    considerations of practical convenience.” See City of Phoenix v. Peterson, 
    11 Ariz. App. 136
    , 141 (App. 1969). Generally, a finding of good cause, or lack
    thereof, is reviewed for an abuse of discretion. See Bd. of Educ. of Tempe
    Union High Sch. Dist. of Maricopa Cnty. v. Lammle, 
    122 Ariz. 522
    , 527 (App.
    1979) (determining whether a trial court’s review of a school board’s
    dismissal of an employee “for good cause” was “arbitrary, capricious or an
    abuse of discretion”); Maher v. Urman, 
    211 Ariz. 543
    , 548-49, ¶ 15 (App.
    2005). When, as here, the superior court has “disturbed” the Commission’s
    finding, we must determine whether the “contrary conclusions . . . are
    supported by clear and satisfactory evidence.” Tucson Elec. Power Co., 
    132 Ariz. at 243
    . Thus, in this case, we must determine if “clear and satisfactory
    evidence” supports the superior court’s conclusion that the Commission
    abused its discretion in finding good cause existed to waive the REST rules.
    See 
    id. at 244
    .
    ¶18           Although the Commission granted Mohave’s application for
    pilot program status, the Commission also acknowledged that an
    “independent and alternative basis” existed to grant Mohave a waiver of
    the REST rules.        This conclusion was consistent with the Staff
    recommendation that the Commission grant Mohave a waiver. In its
    recommendation, Staff emphasized the experimental nature of WTE
    facilities and concluded that “the potential benefits [of a WTE facility]
    outweigh the potential consequences, especially when compared to the
    alternative of landfilling [municipal solid waste].” Staff maintained this
    position throughout the Commission’s proceedings.
    ¶19           On this record, we cannot conclude that Sierra Club showed
    by clear and satisfactory evidence that good cause for a waiver was not
    established. Much of the evidence presented to the Commission may be
    characterized as a debate over the degree to which municipal solid waste
    used as fuel for WTE facilities may be considered “renewable.” Given the
    Commission’s constitutional authority over these matters, the Commission
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    SIERRA CLUB v. AZCC
    Opinion of the Court
    is ultimately charged with evaluating such issues and, as such, is the best-
    equipped branch of government to do so. Although meaningful judicial
    review requires that courts make their own legal determinations, courts
    properly must exercise a more deferential review towards discretionary
    matters “constitutionally entrusted to the Commission.” See US W.
    Commc’n, Inc. v. Ariz. Corp. Comm’n, 
    185 Ariz. 277
    , 280 (App. 1996).
    ¶20            Irrespective of whether the use of municipal solid waste as
    fuel makes a WTE facility eligible for pilot program status, the REST rules
    do not explicitly exclude energy produced from municipal solid waste, or
    at least those portions that may be considered “renewable,” from being
    considered Credit-eligible if the Commission waives the REST rules for
    good cause. To the extent this involves construing the REST rules, we
    conclude only that the Commission retained the discretion to issue a good
    cause waiver of the rules. The Staff report and testimony stating that a WTE
    facility could provide substantial benefit to Arizona’s utility infrastructure
    provided sufficient good cause to issue such a waiver. The superior court’s
    conclusion that the Commission could not waive the REST rules because it
    “would be inconsistent with the exclusion of [municipal solid waste] as an
    eligible renewable resource under the rules” is neither supported by the
    plain language of the REST rules nor by clear and satisfactory evidence in
    this record.
    B.     The Superior Court’s “No Credible Evidence” Conclusion
    ¶21           We next turn to the superior court’s conclusion that no
    credible evidence supported the Commission’s determination allowing
    ninety percent of the municipal solid waste that will be used as fuel by the
    WTE facility to be considered a “renewable energy source.” Because this
    conclusion “disturbed” the Commission’s decision, we must determine
    whether the superior court’s conclusion is supported by “clear and
    satisfactory evidence.” See Tucson Elec. Power Co., 
    132 Ariz. at 243
    .
    ¶22           Similar to an appellate court’s general deference to trial courts
    on credibility determinations and the weighing of evidence, the
    Commission is also entitled to deference when “the [C]ommission’s
    ultimate conclusion or findings of facts [are] supported by substantial
    evidence, is not arbitrary or is not otherwise unlawful.” Simms v. Round
    Valley Light & Power Co., 
    80 Ariz. 145
    , 154 (1956). Put differently, the
    superior court “is not free to overturn” the Commission’s factual
    determinations unless the party challenging those findings “demonstrates
    by ‘clear and convincing evidence’ that the Commission’s determination is
    unreasonable.” Grand Canyon Trust, 
    210 Ariz. at 34
    , ¶ 11 (citing Tucson Elec.
    9
    SIERRA CLUB v. AZCC
    Opinion of the Court
    Power Co., 
    132 Ariz. at 243-44
    ). Substantial evidence is evidence which
    would permit a reasonable person to reach the Commission’s result. See In
    re Estate of Pouser, 
    193 Ariz. 574
    , 579, ¶ 13 (1999).
    ¶23            The two evidentiary hearings before the Commission
    involved significant amounts of live testimony as well as written exhibits.
    Seven witnesses testified at the first hearing and nine at the second. In its
    initial recommendation, Staff stated that data received from Mohave, which
    was considered in formulating the Staff recommendation, showed the
    municipal solid waste that would be used by the proposed WTE facility
    would be composed of an estimated ninety-five percent biogenic
    (renewable) material. Staff deduced that burning municipal solid waste of
    such composition would mean ninety-one percent of the energy produced
    by the facility would be produced by renewable sources. However, Staff
    also noted that the ninety-five percent figure submitted by Mohave was
    high in relation to data about waste composition collected from other WTE
    facilities throughout the United States. Staff thus recommended seventy-
    five percent of any energy produced by the WTE facility be deemed Credit-
    eligible.
    ¶24           After Mohave filed exceptions to the Staff recommendation,
    one Commissioner proposed an amendment that generated the ninety
    percent figure, with an additional provision that could reduce the
    percentage based on what Staff might discover from Mohave’s mandatory
    semi-annual reports. At the first evidentiary hearing, a Staff representative
    testified that Staff had recommended the seventy-five percent figure
    because “we feel, since [the WTE facility] is an experiment or pilot . . . you
    might want to choose the more conservative estimate of the [seventy-five]
    percent. But that’s, obviously . . . a call for the Commission.” At the second
    evidentiary hearing, a different Staff representative testified that the ninety
    percent figure was “within the range . . . calculated based on the samples
    provided by Mohave” and that “it would be a reasonable starting figure,”
    as would Staff’s recommendation of seventy-five percent.
    ¶25            At the second evidentiary hearing, Ronald Blendu testified
    about the data Mohave submitted to Staff. Blendu stated that the data was
    generated from 15,300 pounds of trash collected from a municipal area in
    western Maricopa County. The trash was sorted “into various categories”
    to give RPG an idea of “what the fuel supply would [be to] go into the [WTE
    facility].” Blendu testified in detail about the process used to determine the
    recycling rates, which would presumably indicate RPG’s ability to remove
    non-renewable material out of the waste before it is consumed in the
    facility.
    10
    SIERRA CLUB v. AZCC
    Opinion of the Court
    ¶26           Given this evidence in the Commission record, the superior
    court improperly reweighed the evidence in concluding no credible
    evidence existed to support the ninety percent figure adopted by the
    Commission. See Tucson Elec. Power Co., 
    132 Ariz. at 243
    . Sierra Club
    contends that the Commission’s decision was based on speculative
    evidence that “defied credibility.” But in doing so, Sierra Club merely
    claims the data produced by Mohave and relied upon by Staff is an
    apparent outlier among similar data collections around the United States.
    Although Sierra Club asserts that this other data required the Commission
    to discard Mohave’s data, it is the Commission’s constitutional
    responsibility, when engaged in its ratemaking power, to view conflicting
    evidence and make determinations accordingly.
    ¶27            The nature of Mohave’s data was not lost on the Commission.
    By establishing procedures to report on the actual composition of municipal
    solid waste used as fuel once the WTE facility became operational, the
    Commission implicitly acknowledged that future Credit eligibility may
    require adjustment depending on the data collected. Because the facility is
    not operational, no data on its fuel consumption currently exists, and the
    Commission was faced with deciding Mohave’s application using
    projections and historical data from other facilities across the country. As
    a result, Mohave’s data, the testimony of Blendu, the Staff recommendation,
    and other testimony and evidence amounted to substantial evidence
    supporting the Commission’s decision. The superior court’s conclusion
    that “no credible evidence” supported the Commission’s decision was
    therefore not supported by clear and satisfactory evidence. See Tucson Elec.
    Power Co., 
    132 Ariz. at 243
    . Thus, without new evidence showing Mohave
    was deceptive in producing its data or it was impossible, not just
    improbable, that the proposed WTE facility would produce ninety percent
    of its power from a renewable energy source, the superior court was bound
    by the Commission’s factual findings.
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    SIERRA CLUB v. AZCC
    Opinion of the Court
    CONCLUSION
    ¶28            We conclude the Commission was acting within the REST
    rules’ purview by granting a waiver to Mohave for the WTE facility. We
    also conclude substantial evidence supported the Commission’s
    determination that ninety percent of energy produced by the WTE facility
    would be eligible for Credits, contingent upon the reporting requirements
    and adjustments required by the Commission’s decision. Accordingly, we
    reverse the judgment of the superior court and reinstate the Commission’s
    decision as necessary to be consistent with this decision. Because we
    reverse the superior court’s judgment, we set aside the award of attorney
    fees to Sierra Club.
    :ama
    12