Vote Solar v. Public Service Commn. , 2023 UT 13 ( 2023 )


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    2023 UT 13
    IN THE
    SUPREME COURT OF THE STATE OF UTAH
    VOTE SOLAR,
    Petitioner,
    v.
    PUBLIC SERVICE COMMISSION OF UTAH, 1
    Respondents
    No. 20210041
    Heard September 12, 2022
    Filed June 22, 2023
    On Petition from the Public Service Commission of Utah
    Public Service Commission
    No. 17-035-61
    Attorneys: 2
    Brian W. Burnett, Salt Lake City, Jennifer M. Selendy,
    Philippe Z. Selendy, Caitlin J. Halligan, Joshua S. Margolin,
    Lauren J. Zimmerman, Hannah O. Belitz, Samuel R. Breidbart,
    New York, NY, for petitioner
    Michael J. Hammer, Salt Lake City, for respondent Public Service
    Commission of Utah
    Emily L. Wegener, Stephen K. Christiansen, Heidi K. Gordon,
    Salt Lake City, for respondent Rocky Mountain Power
    Sean D. Reyes, Att’y Gen., Stanford E. Purser, Deputy Solic. Gen.,
    Erin T. Middleton, Patricia E. Schmid, Asst. Solic. Gens., Salt Lake
    City, for respondent Utah Office of Consumer Services
    _____________________________________________________________
    1Other respondents to this review are: ROCKY MOUNTAIN POWER,
    UTAH OFFICE OF CONSUMER SERVICES, and UTAH DIVISION OF PUBLIC
    UTILITIES.
    2Amicus Curiae: Hunter H. Holman, Salt Lake City, for Utah
    Clean Energy; Stephen F. Mecham, Salt Lake City, for Solar Energy
    Industries Association
    VOTE SOLAR v. PUBLIC SERVICE COMMISSION
    Opinion of the Court
    Sean D. Reyes, Att’y Gen., Justin C. Jetter, Spl. Asst. Att’y Gen.,
    Robert J. Moore, Steven W. Snarr, Asst. Att’y Gens., Salt Lake City,
    for respondent Utah Division of Public Utilities
    ASSOCIATE CHIEF JUSTICE PEARCE authored the opinion of the Court in
    which CHIEF JUSTICE DURRANT, JUSTICE PETERSEN, JUSTICE HAGEN, and
    JUSTICE POHLMAN joined.
    ASSOCIATE CHIEF JUSTICE PEARCE, opinion of the Court:
    INTRODUCTION
    ¶1 In 2002, the Utah Legislature mandated that the Public Service
    Commission (PSC) create a “net metering” program for customers
    who also generate electricity. This prompted the PSC to order utility
    companies to implement a net metering system. The net metering
    system compensated consumers who installed solar panels for the
    excess power they exported to the electric grid. In 2014, the
    Legislature required the PSC to evaluate the costs and benefits of the
    net metering program and, if necessary, modify the program based
    on those findings. UTAH CODE § 54-15-105.1. In 2017, the PSC entered
    into a settlement agreement with major stakeholders. As part of the
    settlement agreement, the parties stipulated to the creation of an
    “export credit rate” system, which would eventually replace the net
    metering program.
    ¶2 The PSC then engaged in a lengthy public process to decide
    what factors it should consider to calculate the export credit rate
    (ECR). Several parties, including Vote Solar, testified and presented
    evidence. In October 2020, the PSC issued an order that set forth the
    inputs it would use to calculate the ECR (October Order). The
    October Order also set an initial ECR. Vote Solar, among others,
    moved the PSC to reconsider the inputs it would incorporate into the
    rate, the appropriateness of calculating the rate at all, whether it was
    arbitrary and capricious for the PSC to annually update the rate, and
    whether the PSC’s decision to have unused credits expire annually
    was arbitrary and capricious.
    ¶3 In December 2020, the PSC denied in part and granted in part
    the motions for reconsideration (December Order). The PSC agreed
    to reconsider some of the components of the ECR calculation but
    made clear that it would not revisit other aspects of the October
    Order. Vote Solar seeks review of the December Order.
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    ¶4 The PSC then held hearings during which it accepted
    additional testimony and evidence on those aspects of the ECR that
    the PSC had agreed to reconsider. In April 2021, the PSC adjusted
    the ECR formula and recalculated the ECR (April Order). Vote Solar
    does not seek review of the April Order.
    ¶5 Vote Solar asks us to reverse a number of the decisions the
    PSC announced in the December Order. Vote Solar principally
    argues that we should set that order aside because the PSC did not
    comply with multiple statutory mandates when it discontinued the
    net metering program and set the initial ECR. Vote Solar also
    contends that the PSC’s decisions were not supported by substantial
    evidence.
    ¶6 The Office of Consumer Services (OCS) moves to dismiss Vote
    Solar’s petition for review, arguing that our jurisdiction extends only
    to the PSC’s final agency action and that the December Order was
    not final agency action. Rocky Mountain Power (RMP) joins in OCS’s
    motion.
    ¶7 We grant OCS’s motion in part and deny it in part. We cannot
    reach the substance of Vote Solar’s arguments concerning three of
    the issues decided in December 2020 because the Administrative
    Procedures Act limits our review to “final agency action.” UTAH
    CODE § 63G-4-403(1). The following decisions, from the December
    Order, were not final agency actions: that the PSC had met its
    statutory burden to analyze costs and benefits of net metering, that
    the PSC would only analyze cost-of-service costs and benefits in
    creating the ECR, and that integration costs should be included in
    the ECR calculation. For ease of reference, we refer to these as the
    ECR Calculation Decisions. We therefore lack jurisdiction and have
    no choice but to dismiss the petition as to these issues.
    ¶8 We deny OCS’s motion with respect to two issues decided in
    the December Order: the decision to annually update the ECR and
    the decision to require that unused credits expire. For ease of
    reference, we refer to these as the ECR Operation Decisions. The
    December Order represented the PSC’s final agency action on these
    issues. When we turn to the merits of Vote Solar’s arguments on
    these decisions, we conclude that the PSC did not exceed the bounds
    of its authority, and we affirm the PSC.
    BACKGROUND
    ¶9 The Utah Legislature enacted the “Net Metering Statute” in
    2002. That statute required utility companies to buy back excess
    power from customers who generate their own electricity. UTAH
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    VOTE SOLAR v. PUBLIC SERVICE COMMISSION
    Opinion of the Court
    CODE §§ 54-15-102, -103. The statute mandated that this be
    implemented through a “net metering program.” See id. §§ 54-15-
    102(12), -103(1). Under the net metering program, customers who
    generated excess power (Customer Generators) could cancel out the
    amounts they would have been billed by exporting unused energy to
    the electric grid. See id. §§ 54-15-102(2)–(3), -104(3). Customer
    Generators also received credits for any exported energy that
    exceeded the Customer Generators’ use. Id. §§ 54-15-102(12)(c), -
    104(3). These credits expired at the end of each year. Id. § 54-15-
    104(3)(a)(ii).
    ¶10 The Net Metering Statute also required that the value of the
    credits for exported power equal at least the utility company’s
    “avoided cost,” although the statute gave the PSC discretion to
    mandate a more generous credit to Customer Generators. Id. §§ 54-
    15-102(8)(b), -104(3)(a)(i). The original statute allowed an electric
    company to cap the number of Consumer Generators who could
    participate in the net metering program if the total energy generating
    capacity from customer generation systems reached 0.1% of the
    company’s peak demand during 2001. See id. § 54-15-103(2). The Net
    Metering Statute was amended in 2008 to change the allowable cap
    to 0.1% of peak demand in 2007 and to permit the PSC to raise this
    cap. Id. § 54-15-103(2)–(3).
    ¶11 In 2009, the PSC changed the net metering program in two
    important ways. It increased the credit for exported power, and it
    raised the cap on the net metering program to 20% of peak demand
    in 2007. Participation in the net metering program soared.
    ¶12 As the net metering program’s popularity increased, RMP
    and other organizations expressed concern that the net metering
    program was shifting the program’s costs onto ratepayers who did
    not participate in the program. This apparently motivated the
    Legislature’s 2014 decision to amend the Net Metering Statute to
    require the PSC to evaluate the costs and benefits of the net metering
    program. See UTAH CODE § 54-15-105.1(1). The Legislature also
    instructed the PSC to create a “just and reasonable charge, credit, or
    ratemaking structure.” Id. § 54-15-105.1(2).
    ¶13 The PSC responded to this legislative mandate by opening a
    docket to examine different ways to compensate Customer
    Generators for the energy they exported. Multiple parties—including
    Vote Solar—participated in discussions with the PSC. These
    discussions culminated in a stipulated settlement agreement reached
    between several key parties, including RMP, OCS, the Division of
    Public Utilities, Vivint Solar, and the Utah Solar Energy Association.
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    Vote Solar did not sign the settlement agreement, but it also explicitly
    declined to object to the settlement. 3 The PSC approved the terms of
    that settlement agreement in a 2017 order.
    ¶14 The PSC-approved settlement required utility companies to
    implement an export credit rate to compensate Customer
    Generators. 4 Although the settlement agreement stipulated to an
    ECR, it did not address how the PSC should calculate that ECR. 5
    Over the course of the next three years, the PSC heard testimony,
    took evidence, and invited public comment on what factors it should
    use to calculate the ECR. In October 2020, the PSC issued an order
    that, among other things, identified what it considered to be the
    relevant inputs and calculated an ECR based on those inputs. 6
    _____________________________________________________________
    3   A settlement agreement appears to be a term of art in this
    setting. It refers to a tool for utility rate-making and involves the
    regulatory authority seeking the agreement of many key
    stakeholders. Agency-approved, non-unanimous settlement to
    facilitate utility rate-making has been commonly used in the United
    States for decades. Stefan H. Krieger, Problems for Captive Ratepayers
    in Nonunanimous Settlements of Public Utility Rate Cases, 12 YALE J. ON
    REG. 257, 279–85 (1995). We approved the practice in 1983. Utah Dep’t
    of Admin. Servs. v. Pub. Serv. Comm’n, 
    658 P.2d 601
    , 615–16 (Utah
    1983).
    4 The order approving the settlement stipulation, issued in 2017,
    stated that the PSC had not yet met its statutory burden of analyzing
    the costs and benefits of the net metering program but would do so
    in the future.
    5  The settlement additionally provided that Customer Generators
    who had entered the net metering program between its 2002
    inception and a few weeks after the PSC’s approval of the 2017
    settlement could remain in the program until 2035. The 2017 order,
    in line with the stipulated settlement, also created a “transition
    program” for Customer Generators who began exporting excess
    energy to the grid between the 2017 settlement agreement and the
    creation of an ECR.
    6  The October Order recited that it fulfilled the Net Metering
    Statute’s requirement that the PSC examine the costs and benefits of
    the net metering program. However, the PSC noted in the Order that
    it did not take a position on whether the statute, which required the
    PSC to evaluate the costs and benefits of net metering and create a
    (continued . . .)
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    VOTE SOLAR v. PUBLIC SERVICE COMMISSION
    Opinion of the Court
    ¶15 More specifically, the PSC ruled that it would calculate the
    ECR based on integration costs, avoided energy costs, avoided
    generation costs, avoided transmission costs, and avoided
    distribution capacity costs.
    ¶16 To the disappointment of many, including Vote Solar, the
    PSC also concluded that it would be inappropriate to include factors
    other than the cost-of-service in the ECR calculation. 7 The PSC
    reasoned that, while it recognized “the importance of environmental
    considerations, carbon policy, economic development, and public
    health, these matters fall within the regulatory ambit of other
    government agencies.”
    ¶17 In November 2020, Vote Solar and RMP—among others—
    moved for reconsideration of the October Order. Vote Solar asked the
    PSC to revisit several aspects of the ECR calculation. Vote Solar
    wanted the PSC to reconsider the method of calculating avoided
    energy, the method of calculating avoided capacity cost, the decision
    to include integration costs in the calculation, and the PSC’s decision
    to not include non-economic factors in the ECR. Vote Solar also asked
    the PSC to reconsider its decision to have unused credits expire
    annually and its decision to recalculate the ECR every year.
    ¶18 In December 2020, the PSC granted in part and denied in part
    the requests for reconsideration. The PSC refused to reconsider the
    portions of the October Order that Vote Solar had challenged. But the
    PSC ordered rehearing on two of the issues RMP had asked it to
    reconsider. The PSC left in place the ECR it set in October and
    declared the order final with respect to any issue it was not
    rehearing.
    ¶19 The PSC then took additional testimony and evidence and
    issued a new order in April 2021. This order changed the ECR
    formula and recalculated the ECR based on the updated formula.
    new compensation program based on that evaluation, applied to the
    creation of an ECR.
    7 We have noted that a “rate based on cost of service means a rate
    sufficient to pay operating costs plus the cost of a fair return to
    investors for providing capital, both equity and debt.” Stewart v.
    Utah Pub. Serv. Comm’n, 
    885 P.2d 759
    , 771 (Utah 1994) superseded on
    other grounds by UTAH CODE § 78B-5-825.5, as recognized in Laws v.
    Grayeyes, 
    2021 UT 59
    , ¶¶ 50, 54, 
    498 P.3d 410
    .
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    ¶20 Vote Solar seeks review of five issues decided in the
    December Order: (1) whether the PSC met its statutory burden to
    analyze the costs and benefits of net metering before creating the
    ECR, (2) whether the PSC was required to include benefits other than
    cost-of-service in creating its ECR calculation, (3) whether it was
    proper to include integration costs in the ECR calculation,
    (4) whether the ECR should be updated annually, and (5) whether
    the ECR credits should expire at the end of each year.
    ¶21 OCS—in a motion RMP joins—moves to dismiss Vote Solar’s
    petition, arguing that we lack jurisdiction to hear the petition
    because the December 2020 order was not a final agency action that
    confers jurisdiction on us. We indicated that we would hear the
    motion to dismiss at the same time that we held arguments on the
    merits of the petition.
    STANDARD OF REVIEW
    ¶22 OCS’s challenge to our subject matter jurisdiction presents an
    issue that we will decide in the first instance. As such, we have no
    ruling to review, and no standard of review applies.
    ¶23 The two issues we address on the merits—Vote Solar’s
    challenges to the PSC’s decisions to annually update the ECR and to
    require unused credits to expire—contain different categories of
    questions which require their own analysis on the appropriate
    standards of review.
    ¶24 This analysis begins with the standards established by the
    Administrative Procedures Act. The Act “sets forth the type of
    agency actions for which we may grant relief,” but some sections
    “do[] not expressly mandate the standards of review we must
    employ when reviewing those actions.” Murray v. Utah Labor
    Comm’n, 
    2013 UT 38
    , ¶ 18, 
    308 P.3d 461
    ; see also UTAH CODE § 63G-4-
    403. When a standard is not expressly mandated, “the applicable
    standard of review will depend on the nature of the agency action.”
    Murray, 
    2013 UT 38
    , ¶ 22.
    ¶25 Vote Solar’s challenge to annually updating the ECR contains
    two sub-issues. The first is the PSC’s determination that Customer
    Generators and other non-power-generating residential customers
    constitute different classes of customers. This presents a fact-like
    mixed question of fact and law. Without a clear standard of review
    from the statute, “we apply our traditional standards of review.”
    Provo City v. Utah Labor Comm’n, 
    2015 UT 32
    , ¶ 9, 
    345 P.3d 1242
    .
    “[W]e review fact-like mixed questions deferentially.” Randolph v.
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    VOTE SOLAR v. PUBLIC SERVICE COMMISSION
    Opinion of the Court
    State, 
    2022 UT 34
    , ¶ 24, 
    515 P.3d 444
    ; see also Sawyer v. Dep’t of
    Workforce Servs., 
    2015 UT 33
    , ¶ 11, 
    345 P.3d 1253
    .
    ¶26 The second sub-issue challenges the PSC’s determination that
    the ECR should update annually. Vote Solar contends that this
    determination lacks factual support. The Administrative Procedures
    Act “authorizes appellate courts to grant relief where an ‘agency
    action is based upon a determination of fact, made or implied by the
    agency, that is not supported by substantial evidence when viewed
    in light of the whole record before the court.’” Provo City v. Utah
    Labor Comm’n, 
    2015 UT 32
    , ¶ 8 (quoting UTAH CODE § 63G-4-
    403(4)(g)). Accordingly, “a challenge to an administrative agency’s
    finding of fact is reviewed for substantial evidence.” Id.
    ¶27 Vote Solar likewise challenges the PSC’s decision to require
    unused credits to expire as lacking evidentiary support. We review
    that under the Act’s substantial evidence standard as well.
    ANALYSIS
    ¶28 OCS claims that we lack jurisdiction because the December
    Order was not final agency action. OCS argues that the agency action
    at the heart of the PSC docket established a formula for an ECR, and
    then calculated that ECR. OCS posits that there could not be final
    agency action until the PSC had resolved the motion for rehearing,
    decided what components it would use to calculate the ECR, and
    then recalculated the ECR based on that formula.
    ¶29 Our jurisdiction comes from the Utah Constitution. Article
    VIII, section 3 of the Utah Constitution vests this court with
    jurisdiction over extraordinary writs and questions certified from the
    federal court. Section 3 also provides that the Supreme Court “shall
    have appellate jurisdiction over all other matters to be exercised as
    provided by statute.” UTAH CONST. art. VIII, § 3.
    ¶30 The Legislature has defined the Supreme Court’s appellate
    jurisdiction over “final orders and decrees in formal adjudicative
    proceedings originating with . . . the Public Service Commission.”
    UTAH CODE § 78A-3-102(3)(e)(i). The Administrative Procedures Act
    further refines this court’s appellate jurisdiction to review an
    agency’s formal adjudicative proceeding as jurisdiction over “final
    agency action.” Id. § 63G-4-403(1). 8 The Legislature has not
    _____________________________________________________________
    8 An astute reader might question why this court focuses on the
    “final agency action” language of the Administrative Procedures Act
    when Utah Code section 78A-3-102(3)(e)(i) gives us jurisdiction over
    (continued . . .)
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    Opinion of the Court
    statutorily defined final agency action. And we appear to have had
    surprisingly few opportunities to examine what it means for an
    agency’s action to be final. Because much of our analysis will turn on
    what it means to be “final agency action,” we take a few paragraphs
    to examine how our case law on that question has developed.
    ¶31 We first took up the question in Barker v. Utah Public Service
    Commission, 
    970 P.2d 702
     (Utah 1998). There, we were presented with
    the question of whether the PSC’s award of attorney fees was final
    agency action. Id. at 705.
    ¶32 In litigation that preceded the dispute at issue in Barker, a
    group of ratepayers had asked for review of a PSC rate-making
    decision and sought an award of the fees they had incurred
    challenging the rate in front of the Commission and this court.
    Stewart v. Utah Pub. Serv. Comm’n, 
    885 P.2d 759
    , 781–84 (Utah 1994),
    superseded on other grounds by UTAH CODE § 78B-5-825.5, as recognized
    in Laws v. Grayeyes, 
    2021 UT 59
    , ¶¶ 50, 54, 
    498 P.3d 410
    . We agreed
    with the ratepayers and remanded. Id. at 762, 784. We also awarded
    the ratepayers their attorney fees and instructed the PSC to
    “determine the amount of time reasonably expended by [the
    ratepayers’] attorneys on the issues before the Commission and on
    appeal upon which [the ratepayers] have prevailed.” Id. at 783.
    ¶33 In Barker, the ratepayers challenged the PSC’s order
    awarding attorney fees. Barker, 970 P.2d at 704–05. The ratepayers
    argued that the PSC had unreasonably discounted the fees they
    incurred. Id. at 705, 709. The PSC argued that the attorney fee award
    was not final because the PSC was rehearing the calculation of a
    refund to its customers that flowed from our decision in Stewart.
    Barker, 970 P.2d at 705–06. We rejected that argument, concluding
    that the reconsideration of the refund order had no bearing on the
    attorney fee award. Id.
    “final orders . . . originating with” the PSC. This is because Utah
    Code section 78A-3-102(6) states that “[t]he Supreme Court shall
    comply with the requirements of Title 63G, Chapter 4,
    Administrative Procedures Act, in its review of agency adjudicative
    proceedings.” We have interpreted this to mean that our jurisdiction
    is premised on final agency action, as that term is used in the
    Administrative Procedures Act. See, e.g., Union Pac. R.R. Co. v. Utah
    State Tax Comm’n, 
    2000 UT 40
    , ¶¶ 11–16, 
    999 P.2d 17
    .
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    ¶34 Along the way, we defined “final agency action.” We drew
    on United States Supreme Court precedent and the Model State
    Administrative Procedures Act to craft a definition. Id. at 705-06.
    ¶35 We first explained the holding of the then-current United
    States Supreme Court precedent regarding the Administrative
    Orders Review Act, 
    28 U.S.C. § 2342
     (1988):
    The relevant considerations in determining finality are
    whether the process of administrative decisionmaking
    has reached a stage where judicial review will not
    disrupt the orderly process of adjudication and
    whether rights or obligations have been determined or
    legal consequences will flow from the agency action.
    Barker, 970 P.2d at 706 (cleaned up) (quoting Port of Boston Marine
    Terminal Ass’n v. Rederiaktiebolaget Transatlantic, 
    400 U.S. 62
    , 71
    (1970)).
    ¶36 We then noted that “the Model State Administrative
    Procedure Act defines final agency action negatively as ‘the whole or
    a part’ of any action which is not ‘preliminary, preparatory,
    procedural, or intermediate with regard to subsequent agency action
    of that agency or another agency.’” 
    Id.
     (quoting 1981 Model State
    Admin. P. Act § 5-102(b)(2)).
    ¶37 Two years later, we took up the question in Union Pacific
    Railroad Co. v. Utah State Tax Commission, 
    2000 UT 40
    , 
    999 P.2d 17
    . In
    Union Pacific, a railroad company challenged the Utah State Tax
    Commission’s Property Tax Division’s valuation of its properties,
    first before the Tax Commission, then before the court. 
    Id.
     ¶¶ 4–9.
    The Commission issued four orders. 
    Id.
     ¶¶ 4–7. The first order
    decided the initial challenge but allowed twenty days for a motion
    for reconsideration. Id. ¶ 4. The parties moved for reconsideration,
    and the Tax Commission issued a second order based on that
    proceeding, again allowing twenty days to file a motion for
    reconsideration. Id. ¶ 5. After the second order, an untimely
    challenge to the first order led to a third order from the Commission.
    Id. ¶¶ 5–7. The third order stated that the time for rehearing of the
    first order had elapsed and did not allow for reconsideration before
    the Tax Commission, only a petition for review to this court or the
    district court. Id. ¶ 6 & n.2. The parties then moved for
    reconsideration on the second order, and the Commission’s fourth
    order denied that motion and, like the third order, did not allow for
    agency reconsideration, only review by this court or the district
    court. Id. ¶ 7.
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    ¶38 Union Pacific sought review of the fourth order, petitioning
    for review in both the district court and this court, although both
    petitions came well after the thirty-day deadline. Id. ¶ 8. The district
    court dismissed for lack of subject matter jurisdiction. Id. ¶ 9. Union
    Pacific argued before us that the fourth order was not “final agency
    action,” and therefore it was not required to have sought review
    within the thirty-day window. Id. ¶ 10. Union Pacific asked us to
    remand to the Tax Commission “for issuance of a final order” that
    would constitute final agency action and trigger our jurisdiction and
    Union Pacific’s time to petition for review. Id.
    ¶39 In Union Pacific, we expanded upon Barker and articulated
    the test for “final agency action”:
    (1) Has administrative decisionmaking reached a stage
    where judicial review will not disrupt the orderly
    process of adjudication?;
    (2) Have rights or obligations been determined or will
    legal consequences flow from the agency action?; and
    (3) Is the agency action, in whole or in part, not
    preliminary, preparatory, procedural, or intermediate
    with regard to subsequent agency action?
    Id. ¶¶ 15–16.
    ¶40 We explained that “[a]gency actions that meet the foregoing
    test are appealable from the date of the order’s issuance until the last
    day to appeal the last final agency action in the case.” Id. ¶ 16
    (cleaned up).
    ¶41 The Union Pacific court held that the Tax Commission’s
    fourth order was final and that the petitioner had missed the
    deadline to seek review. Id. ¶ 24. When we analyzed whether ruling
    on the fourth order would disrupt the “orderly process of
    adjudication,” we emphasized that “by denying reconsideration of
    its earlier findings and conclusions, the Tax Commission reached the
    end of its decisionmaking process.” Id. ¶ 19.
    ¶42 We further held that “rights or obligations” had been
    determined because the order affirmed the railroad’s tax obligations.
    Id. ¶¶ 16, 20. We also opined that the order was not “preliminary,
    preparatory, procedural, or intermediate” because it “did not
    remand the valuation issues for further proceedings[,] nor . . . deny
    motions to dismiss. Instead, . . . [it] denied requests to reconsider the
    Tax Commission’s holdings . . . and ended its decisionmaking
    process by leaving no issues unresolved.” Id. ¶ 21.
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    ¶43 Our next opportunity to examine what final agency action
    means came in a case in which we reviewed a court of appeals
    decision applying the Union Pacific test: Ameritemps, Inc. v. Utah Labor
    Commission (Ameritemps) 
    2007 UT 8
    , 
    152 P.3d 298
    , aff’g Ameritemps,
    Inc. v. Labor Commission, 
    2005 UT App 491
    , 
    128 P.3d 31
    .
    ¶44 In that case, a worker sought compensation for an on-the-job
    injury. Ameritemps, Inc. v. Labor Comm’n, 
    2005 UT App 491
    , ¶¶ 2–3,
    aff’d sub nom Ameritemps, Inc. v. Utah Labor Comm’n, 
    2007 UT 8
    . The
    worker’s employer sought review of the Labor Commission’s
    conclusion that he had suffered permanent, total disability. 
    Id.
     ¶¶ 5–
    6. The employer argued that there could be no judicial review of the
    order designating disability because the determination was not final
    under the Workers’ Compensation Act until the Commission ruled
    on a reemployment plan. Id. ¶¶ 9, 12 (citing UTAH CODE § 34A-2-413
    (2005)).
    ¶45 The court of appeals applied the Union Pacific test and held
    that review of the order would not disrupt the orderly process of
    adjudication because the Labor Commission had denied
    reconsideration on the finding of disability. Id. ¶ 20. The court of
    appeals reasoned that the disability analysis was distinct from the
    analysis the Labor Commission would conduct to approve the
    reemployment plan. Id.
    ¶46 The court of appeals held the second factor was met because
    the Labor Commission had determined rights or obligations when
    disability payments had begun based on the order. Id. ¶ 21.
    ¶47 The court of appeals also held that the order declaring the
    worker permanently disabled was not “preliminary, preparatory,
    procedural, or intermediate” because it “decide[d] permanent total
    disability with finality.” Id. ¶¶ 22–23. The court pointed out that in
    Barker, we provided examples of orders that are “preliminary,
    preparatory, procedural, or intermediate,” namely a “remand for
    further proceedings,” “an order converting informal proceedings to
    formal” proceedings, and an order denying a motion to dismiss. Id.
    ¶ 22 (quoting Barker, 970 P.2d at 706). The court of appeals did not
    think that any of these examples were analogous to the Labor
    Commission’s disability determination. See id. ¶ 23.
    ¶48 We affirmed the court of appeals. Ameritemps, 
    2007 UT 8
    ,
    ¶¶ 10, 13. In our opinion, we noted that the parties had not
    adequately briefed the jurisdictional issue, even though it was the
    only issue on which we had granted certiorari. Id. ¶ 11. We wrote:
    “For the most part, the parties disregarded the question on which we
    12
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    Opinion of the Court
    granted certiorari, and they treated superficially, if at all, the rule of
    law at issue.” 
    Id.
    ¶49 Despite the absence of briefing, we adopted the court of
    appeals’ analysis whole cloth because “the clarity and correctness of
    the court of appeals’ analysis was sufficient to allow us to resolve
    any misunderstanding that may have existed about the current state
    of the law.” Id. ¶ 12. 9 We thus concluded that the order determining
    disability constituted final agency action. Id. ¶¶ 10, 13.
    ¶50 Our most recent application of the Union Pacific test can be
    found in Heber Light & Power Co. v. Utah Public Service Commission,
    
    2010 UT 27
    , 
    231 P.3d 1203
    . There, we applied the Union Pacific test to
    a PSC scheduling order. 
    Id.
     ¶¶ 7–12.
    ¶51 Heber Light & Power (Heber Light) is a municipal power
    company that was purveying power outside of its authorized
    bounds. Id. ¶ 3. RMP filed a complaint with the PSC to prevent
    Heber Light from continuing the practice. Id. ¶ 1. Heber Light moved
    to dismiss, arguing that the PSC lacked jurisdiction because Heber
    Light is not a public utility and is therefore outside the PSC’s
    jurisdiction. Id. The PSC denied that motion and entered a
    scheduling order indicating it had jurisdiction over the issue. Id.
    Heber Light sought review. Id. ¶ 2.
    ¶52 We applied the Union Pacific test and concluded that the
    scheduling order failed all three inquiries. Id. ¶¶ 8–12. We first held
    that hearing a challenge to the scheduling order would disrupt the
    orderly process of adjudication. Id. ¶ 9. We reasoned that the PSC
    had not yet decided the substantive issues, because it had only
    concluded that it had jurisdiction. Id. ¶¶ 8–9. We wrote: “Far from
    ending the administrative process, the order signaled the beginning
    of the process, a process that would be disrupted were Heber Light
    allowed to appeal.” Id. ¶ 9.
    _____________________________________________________________
    9  Ameritemps is our precedent, precedent that no party has
    challenged. We note, however, that our decision there appears to
    have been influenced by the shabby briefing the parties provided.
    See Ameritemps, 
    2007 UT 8
    , ¶¶ 11–12. We certainly did not show our
    work in that decision nor explain why we thought the court of
    appeals was correct. This causes us to view Ameritemps with a little
    caution and leaves us a bit wary of any lessons we might try to draw
    from the case.
    13
    VOTE SOLAR v. PUBLIC SERVICE COMMISSION
    Opinion of the Court
    ¶53 We opined that the scheduling order did not determine
    rights or obligations. Id. ¶ 10. And we held that the order was
    “[p]reliminary, [p]reparatory, [p]rocedural, or [i]ntermediate,”
    because it was a denial of a motion to dismiss. Id. ¶¶ 11–12. We
    noted that “the Commission was still in the process of adjudicating
    the dispute after the order was issued.” Id. ¶ 11.
    ¶54 It is this case law that OCS draws upon to argue that the
    December Order is not final agency action. More specifically, OCS
    argues that the December Order fails the first and third parts of the
    Union Pacific test. OCS contends that the December and April Orders
    each ultimately set an ECR, so if Vote Solar seeks review of the
    December Order but not the April Order, the orderly process of
    adjudication will be disrupted. OCS also argues that the December
    Order was “preliminary, preparatory, procedural, or intermediate”
    because it granted a rehearing on issues that would impact the
    ultimate (and still not fully decided) calculation of the ECR.
    ¶55 We partially agree with OCS. When we run the December
    Order through the Union Pacific test, we see that the PSC had not
    taken final action on those issues necessary to calculate the ECR. This
    means we lack jurisdiction to consider Vote Solar’s challenges
    centered on whether the PSC analyzed the costs and benefits of net
    metering before creating the ECR, whether the Net Metering Statute
    required the PSC to include benefits other than cost-of-service in the
    ECR calculation, and whether the PSC could properly include
    integration costs in the ECR. As noted above, we refer to these as the
    ECR Calculation Decisions.
    ¶56 The PSC did take final agency action in the December Order
    on two of the issues Vote Solar challenges. The PSC reached the end
    of its decision-making on whether the ECR should be updated
    annually and on whether the ECR credits should expire at the end of
    each year. We refer to these as the ECR Operation Decisions.
    I. THE DECEMBER 2020 ORDER WAS INTERMEDIATE WITH
    REGARD TO SUBSEQUENT PSC ACTION ON THE ECR
    CALCULATION DECISIONS
    ¶57 OCS argues that the December Order was “preliminary,
    preparatory, procedural, or intermediate with regard to subsequent
    agency action,” and thus is not final agency action. (Quoting Union
    Pac. R.R. Co. v. Utah State Tax Comm’n, 
    2000 UT 40
    , ¶ 16, 
    999 P.2d 17
    .)
    OCS contends that because the December Order granted a motion to
    reconsider aspects of the ECR, and because a new ECR was set in
    14
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    Opinion of the Court
    April, the December Order was intermediate in the truest sense of
    the word.
    ¶58 Vote Solar argues that the December Order was final because
    the PSC had “reached the end of its decision-making process” on
    those components of the ECR it challenges in this court. (Quoting
    Barker v. Utah Pub. Serv. Comm’n, 
    970 P.2d 702
    , 706 (Utah 1998).)
    ¶59 We see it differently and conclude that the December Order
    was an intermediate order as to the ECR Calculation Decisions. A
    number of Vote Solar’s challenges focus on the way the PSC
    intended to calculate the ECR. Vote Solar asks us to review whether
    the PSC has met its statutory burden to weigh the costs and benefits
    of net metering and the PSC’s decision to include integration costs,
    and to not include non-economic factors in the ECR. Each of these is
    a challenge to the validity or outcome of the ECR calculation.
    Because the PSC granted a motion to reconsider aspects of the ECR’s
    calculation, the PSC did not take final action on the ECR Calculation
    Decisions until the April Order.
    ¶60 Vote Solar claims that our case law dictates a contrary result.
    It argues that “Utah courts have consistently held that an agency
    order is final agency action where it decides certain issues with
    finality and leaves others unresolved.” Vote Solar contends that the
    issues it challenges from the December Order are “discrete
    components” of the ECR calculation that can be used to “calculat[e]
    an output.” That is true as far as it goes, but it fails to tell us what
    issues in the December Order were decided with finality.
    ¶61 The cases Vote Solar makes the centerpiece of its arguments
    are not much help to it either. Neither of the orders we examined in
    Barker and Ameritemps were intermediate the way the ECR
    Calculation Decisions are here.
    ¶62 The Barker order concerned attorney fees that would not be
    changed when the PSC reheard the refund calculation. Barker, 970
    P.2d at 705; see supra ¶¶ 31–36. Similarly, nothing the Labor
    Commission did with the reemployment plan in Ameritemps would
    modify the substance of the challenged order: a determination that
    the Ameritemps employee had suffered a permanent, total disability.
    Ameritemps, Inc. v. Labor Comm’n, 
    2005 UT App 491
    , ¶ 23, 
    128 P.3d 31
    ,
    aff’d sub nom. Ameritemps, Inc. v. Utah Labor Comm’n, 
    2007 UT 8
    , 
    152 P.3d 298
    ; see supra ¶¶ 43–49. These orders were not intermediate
    because—while the orders were related to other issues being
    litigated—those ongoing issues did not depend on—or potentially
    change based on—the outcome of the orders’ review.
    15
    VOTE SOLAR v. PUBLIC SERVICE COMMISSION
    Opinion of the Court
    ¶63 Such is not the case here. Many of the issues decided in the
    December Order could flow into the issues that the PSC was
    rehearing. For example, the PSC calculated the ECR in the April
    Order by applying the integration costs the PSC identified in the
    December Order. But the October and December ECR also factored
    in some inputs that the PSC reconsidered in the April Order.
    ¶64 Similarly, Vote Solar challenges whether the PSC analyzed
    the costs and benefits of net metering before creating the ECR and
    whether the Net Metering Statute required the PSC to include
    benefits other than cost-of-service in the ECR calculation. Although
    the PSC strongly signaled the fate of those issues when it refused to
    rehear them, there was no final action on those topics until the PSC
    completed the task of defining the ECR. This is because until the PSC
    declared its work on the ECR calculation complete, it could always
    go back and adjust the calculation to include other benefits or
    redefine the costs and benefits of the net metering program.
    ¶65 In other words, until the PSC presented its final ECR, we
    would not be able to definitively say what it included and what it
    excluded. Nor could we say what the PSC had considered until it
    stopped considering. This means that the question of what inputs the
    PSC would use to calculate the ECR and the question of the validity
    of what the PSC used to create the ECR calculation at all were in flux
    until it finished ruling on the motion for reconsideration. This makes
    the December Order intermediate with respect to the ECR
    Calculation Decisions. And intermediate orders are not final agency
    action.
    ¶66 This analysis does not change simply because the PSC
    announced—in the order partially denying rehearing—that it did
    not intend to revisit a number of decisions about the inputs it would
    use. 10 Vote Solar suggests that the PSC’s representation meant that
    _____________________________________________________________
    10   Vote Solar argues that the PSC dubbing the December Order
    “final” should be granted “significant weight” in analyzing whether
    it is final agency action. We recognize that it may be frustrating to
    parties that an agency’s statement that an order is final is not
    determinative of finality. But, as we have stated, “agency decisions
    premised on pure questions of law are subject to non-deferential
    review for correctness.” Ellis-Hall Consultants v. Pub. Serv. Comm’n
    
    2016 UT 34
    , ¶ 27, 
    379 P.3d 1270
    . If we were to defer to an agency’s
    conclusion about the finality of its order, we would, in essence, give
    the agency a disproportionate say in when our jurisdiction adheres.
    16
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    Opinion of the Court
    the PSC had reached the end of the road on those issues it said were
    final, making them final agency action and fair game for review. This
    type of reasoning, however, would read “intermediate” out of the
    Union Pacific test. The focus should be on whether the issues will
    continue to play a role in decisions the PSC has yet to make and not
    on the PSC’s declarations about whether it intends to rehear those
    issues. Here, the ECR Calculation Decisions were “preliminary,
    preparatory, procedural, or intermediate with regard to subsequent
    agency action” until the ECR calculation was set in April. See Union
    Pac. R.R. Co., 
    2000 UT 40
    , ¶ 16.
    A. Proper Application of the Union Pacific Test Does Not Preclude
    Agency Orders from Ever Becoming Final Agency Action
    ¶67 Vote Solar pushes back against this conclusion by raising a
    policy concern. Vote Solar contends that if we conclude the
    December Order is intermediate, it will make it much more difficult
    to petition for review of agency actions. Vote Solar reasons that, if
    the existence of the April Order changing some inputs of the ECR
    calculation makes the December Order not “final agency action,”
    then the existence of the August 2021 Order updating the ECR, or
    the other further orders in the docket, would make the April Order
    non-final and therefore unreviewable. Vote Solar predicts that this
    would render agency action forever unreviewable because the
    agency could continually move the goalposts, thereby never taking
    final agency action.
    ¶68 We see the issue, but it is one that is better understood as a
    mootness concern. Once the PSC settled on the formula it would use
    to calculate the ECR, we had final agency action.
    ¶69 We understand Vote Solar’s argument that the PSC might
    later change the ECR calculation in a way that impacts the issues on
    review. That would not, however, retroactively shift the nature of
    what the PSC had decided from final to non-final. It might, however,
    render our review of the prior order moot.
    ¶70 We understand Vote Solar’s concern that it might be difficult
    to seek review if the PSC changes its approach and moots a
    challenge. But the way to address this concern is not to expand the
    definition of final agency action, but to recognize that our
    jurisprudence allows us to, in certain circumstances, hear a mooted
    challenge. For example, an exception to mootness exists when an
    issue will “(1) affect the public interest, (2) be likely to recur, and
    17
    VOTE SOLAR v. PUBLIC SERVICE COMMISSION
    Opinion of the Court
    (3) because of the brief time that any one litigant is affected, be likely
    to evade review.” Widdison v. State, 
    2021 UT 12
    , ¶ 14, 
    489 P.3d 158
    (cleaned up). 11
    II. RULING ON THE ECR CALCULATION DECISIONS WOULD
    DISRUPT THE ORDERLY PROCESS OF ADJUDICATION
    ¶71 The Union Pacific test also asks whether “administrative
    decisionmaking [has] reached a stage where judicial review will not
    disrupt the orderly process of adjudication.” Union Pac. R.R. Co. v.
    Utah State Tax Comm’n, 
    2000 UT 40
    , ¶ 16, 
    999 P.2d 17
    . OCS argues
    that hearing a challenge to the December Order would disrupt the
    “orderly process of adjudication.” OCS primarily argues that
    problems could arise if this court took jurisdiction over the
    December Order—which set an ECR—at the same time the PSC
    revisited that ECR on a motion for rehearing.
    ¶72 Vote Solar does not dispute that the PSC continued to
    calculate the ECR after it issued the December Order. But it contends
    that does not matter because the decisions it challenges on review
    were decided with finality in December 2020 and are separate issues
    from the components of the ECR decided in April 2021. Vote Solar
    argues that we could address some ECR components while the PSC
    continued its process on other ECR components without disrupting
    the orderly process of adjudication. We are not as sanguine as Vote
    Solar.
    ¶73 Vote Solar’s petition for review of the December Order while
    the PSC was reconsidering the ECR created the potential for dueling
    orders. Should we conclude that the December Order is a final
    agency action, and then agree with Vote Solar on some of its
    arguments on review, the PSC would need to change its approach.
    Depending on how we ruled, the PSC might need to recalculate the
    ECR with a different set of inputs or perhaps even go back and do a
    different cost-benefit analysis of the net metering program. This
    hypothetical holding would also make the ECR that the PSC set in
    the April Order legally infirm because it is based on those inputs in
    the December Order and the decision that the cost-benefit analysis
    _____________________________________________________________
    11 We offer no opinion on how we might rule on such an
    argument. We raise the potential argument to highlight that the
    concerns Vote Solar advances may raise the type of issues that
    animate our exception to mootness.
    18
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    Opinion of the Court
    fulfills the PSC’s statutory obligation. But Vote Solar did not seek
    review of that April Order.
    ¶74 This hypothetical would leave us with a decision from this
    court reversing the PSC’s decision on some of the inputs it would
    use to calculate the ECR (or its approach to its statutory obligations)
    and a subsequent, unchallenged PSC decision calculating the ECR
    based on those now-reversed inputs (or the now erroneous
    approach). This type of result appears to have motivated the
    Legislature to only allow review of final agency action. This also
    exemplifies why the Union Pacific test considers the real-world
    impact of a challenge to help decide whether an order constitutes
    final agency action.
    ¶75 Vote Solar’s petition for review of the December Order also
    creates the potential for disrupting the orderly decision-making
    process by limiting the options available to the PSC on
    reconsideration. If Vote Solar is right, and the December Order is
    reviewable as final agency action, the PSC would lose the ability to
    revisit any of the ECR components that it deemed final, even while it
    reconsiders other components of that same calculation. This is
    because the PSC would lose jurisdiction over any issue on review.
    So, while the PSC reconsidered the inputs to the ECR, it would be
    unable to revisit its previous decisions on those inputs even if it
    received testimony or evidence that prompted the need to go back
    and adjust them. This disruption to the process is avoided if we
    recognize that the December Order decisions on fulfilling the Net
    Metering Statute, using only cost-of-service costs and benefits, and
    adding integration costs to the ECR were non-final agency action. 12
    III. THE DECEMBER ORDER CONSTITUTES FINAL AGENCY
    ACTION ON THE ECR OPERATION DECISIONS
    ¶76 In contrast to the ECR Calculation Decisions, the ECR
    Operation Decisions embody the PSC’s final action on those issues.
    To start, the PSC’s decisions to have ECR credits expire annually and
    to have the ECR calculation itself be updated annually were not
    “preliminary, preparatory, procedural, or intermediate with regard
    _____________________________________________________________
    12 The OCS does not contest that the December Order meets the
    second prong of the Union Pacific test—that rights or obligations
    were determined by, or legal consequences flowed from, the Order.
    Since it is conceded and unbriefed, we express no view on the
    correctness of the assertion.
    19
    VOTE SOLAR v. PUBLIC SERVICE COMMISSION
    Opinion of the Court
    to subsequent agency action.” See Union Pac. R.R. Co. v. Utah State
    Tax Comm’n, 
    2000 UT 40
    , ¶ 16, 
    999 P.2d 17
    . Neither of these decisions
    played any role in calculating the ECR in the April Order. Those
    decisions would apply the same to whatever the PSC decided with
    respect to the ECR Calculation Decisions. Thus, they were not
    intermediate, preliminary, or preparatory to any subsequent PSC
    action.
    ¶77 Nor will our review of those decisions create the potential to
    “disrupt the orderly process of adjudication.” See 
    id.
     We can
    determine if the PSC correctly decided whether to have the ECR
    credits expire annually and whether to update the ECR annually
    without impacting the ECR that the April Order set. Stated
    differently, the decision to have the credits expire would apply the
    same to whatever size credit rate the PSC’s April Order set. Ditto the
    PSC’s decision to reevaluate that credit rate every year.
    ¶78 Moreover, there is no evidence in the record before us that
    the PSC might have needed the ability to revisit the ECR Operation
    Decisions when it reheard questions about the ECR’s calculation. On
    this record, we can conclude that we can hear the ECR Calculation
    Decisions without compromising the PSC’s ability to decide the
    remaining issues or risking the possibility of competing and
    contradictory orders. The ECR Operation Decisions constitute final
    agency action under the Union Pacific framework.13
    ¶79 Because we have final agency action on the ECR Operation
    Decisions, we have jurisdiction to address the substance of Vote
    Solar’s challenges.
    _____________________________________________________________
    13 Let us be the first to recognize that our decision is unsatisfying
    because the Union Pacific test, as we apply it to the PSC’s decisions
    here, requires parties to have a surplus of confidence in their ability
    to correctly analyze whether something is final agency action.
    Whether the result we reach is influenced by OCS conceding the
    second Union Pacific inquiry, a clunky Union Pacific test, or a need to
    have the Legislature define “final agency action” might be up for
    debate. But what could be beyond dispute is that our statute and
    current test fail to give us the certainty that we strive for in other
    rules governing the finality of orders and judgments. See, e.g., UTAH
    R. APP. P. 4; UTAH R. CIV. P. 58A. We can anticipate that a future
    party might ask us to abandon or refine the Union Pacific test or ask
    the Legislature to better define “final agency action.”
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    IV. SUBSTANTIAL EVIDENCE SUPPORTS THE PSC’S DECISION
    TO ANNUALLY UPDATE THE ECR
    ¶80 Vote Solar argues that we should reverse the PSC’s decision
    to annually update the ECR. Vote Solar’s challenge on this issue
    presents two sub-issues: (1) whether Customer Generators and other
    non-power-generating residential customers constitute different
    classes of customers and (2) whether the ECR should update
    annually. Vote Solar first argues that the PSC is required to charge
    similarly situated customers the same rate unless there is substantial
    evidence of differences that necessitate a diverging rate. Vote Solar
    contends that the PSC violated this principle by treating Customer
    Generators differently than other ratepayers when it ordered an
    annual update to the ECR. Vote Solar further asserts that the PSC’s
    determination that Customer Generators are not similarly situated to
    other ratepayers is not supported by substantial evidence. 14
    ¶81 On the first sub-issue, the PSC does not contest the legal
    premise that it cannot treat similarly situated customers differently
    but contends that Customer Generators are not similarly situated to
    other ratepayers. 15
    ¶82 As an initial matter, we agree with the parties that the basic
    legal principle is not in dispute. Utah Code section 54-3-8(1)(b)
    forbids the PSC from creating “unreasonable difference[s] as to rates
    . . . between classes of service.” We discussed this principle in
    Mountain States Legal Foundation v. Utah Public Service Commission,
    
    636 P.2d 1047
     (Utah 1981). In Mountain States, Utah Power & Light
    Company created a discounted “senior citizen rate” for heads of
    household over the age of sixty-five. Id. at 1050. We stated that it “is
    _____________________________________________________________
    14 Most of the time, Vote Solar frames its argument in terms of the
    PSC’s decisions lacking substantial evidence. At a few points in its
    brief, Vote Solar parrots the Administrative Procedure Act’s
    language and calls the decisions “arbitrary, capricious, and lacking
    substantial evidence.” (Citing UTAH CODE § 63G-4-403(4).) Because
    the substance of Vote Solar’s arguments focuses on the evidence
    underlying the decisions, we stick with that framing.
    15 The PSC and RMP additionally argue that, contrary to Vote
    Solar’s contention, non-power-generating residential customers are
    also subject to annually updating rates. Because we dispose of Vote
    Solar’s argument on other grounds, we need not reach the substance
    of that argument.
    21
    VOTE SOLAR v. PUBLIC SERVICE COMMISSION
    Opinion of the Court
    axiomatic in rate making that utilities are barred from treating
    persons similarly situated in a dissimilar fashion,” and we struck the
    preferred rate for seniors. Id. at 1052, 1057–58.
    ¶83 We did not hold that the PSC is powerless to recognize that
    certain of its constituents can be grouped into categories. To the
    contrary, we stated that “[r]easonable classifications between
    consumers may be made, but there must be adequate findings of
    fact, supported by evidence, which demonstrate a rational basis for
    the classification.” Id. at 1052.
    ¶84 Vote Solar nevertheless argues that the PSC must require
    RMP to treat Customer Generators the same as other customers
    when it comes to annually updating their rates because there is not
    substantial evidence supporting a decision to treat the two groups
    differently.
    ¶85 This presents a fact-like mixed question that we review
    deferentially. 16 See Randolph v. State, 
    2022 UT 34
    , ¶ 24, 
    515 P.3d 444
    .
    Such questions generally arise when “application of a legal concept
    is highly fact dependent and variable. Or when the factual scenarios
    presented are so complex and varying that no rule adequately
    addressing the relevance of all these facts can be spelled out.” 
    Id.
    (cleaned up).
    ¶86 Although the Administrative Procedures Act does not give
    us the standard of review, it defines the deference we provide to an
    agency’s factual findings. See UTAH CODE § 63G-4-403(4)(g). We look
    to see if there is substantial evidence to support the agency’s
    decision. See id. “A decision is supported by substantial evidence if
    there is a quantum and quality of relevant evidence that is adequate
    to convince a reasonable mind to support a conclusion.” Provo City v.
    Utah Labor Comm’n, 
    2015 UT 32
    , ¶ 8, 
    345 P.3d 1242
     (cleaned up).
    ¶87 The problem Vote Solar faces is that ample evidence existed
    to permit the PSC to conclude that Customer Generators are not
    similarly situated to other customers. The PSC pointed out in its
    October Order that “[ECR] updates [do] not directly impact the rates
    an RMP customer pays for electricity.” The PSC also noted that if
    _____________________________________________________________
    16  The Administrative Procedures Act does “not expressly
    mandate” the standard of review to use in this circumstance, so we
    revert to our traditional standard of review. Murray v. Utah Labor
    Comm’n, 
    2013 UT 38
    , ¶ 18, 
    308 P.3d 461
    ; see also UTAH CODE § 63G-4-
    403.
    22
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    Opinion of the Court
    Customer Generators wanted a fixed long-term rate in exchange for
    solar power, they could become a commercial generator under
    Schedule 37, an option that is not available to customers who do not
    sell energy to RMP. Moreover, multiple experts testified that
    updating the ECR annually could ensure costs would not be shifted
    onto non-power-generating residential RMP customers.
    ¶88 Simply stated, the evidence before the PSC allowed it to find
    that there is a difference between a group of customers who buy
    power and a group of customers who both buy and sell power.
    ¶89 Vote Solar additionally contends that the PSC’s finding that
    the ECR should be updated annually is unsupported by substantial
    evidence. This sub-issue presents a question of fact, and, as
    explained above, we review an agency’s factual findings for
    substantial evidence. See UTAH CODE § 63G-4-403(4)(g).
    ¶90 The PSC points to evidence before it that annually updating
    the ECR would “introduce volatility and uncertainty” into the
    returns on solar panel procurement and thus disincentivize
    investment. Vote Solar makes a compelling case that there was
    evidence before the PSC that might have supported a different
    conclusion.
    ¶91 But that is not the test to set aside the PSC’s factual findings.
    When we conduct a “substantial evidence review, we do not reweigh
    the evidence and independently choose which inferences we find to
    be the most reasonable.” Provo City v. Utah Labor Comm’n, 
    2015 UT 32
    , ¶ 8 (cleaned up). Rather, “we defer to an administrative agency’s
    findings because when reasonably conflicting views arise, it is the
    agency’s province to draw inferences and resolve these conflicts.” 
    Id.
    (cleaned up).
    ¶92 Here, the PSC relied on evidence from multiple experts that
    failure to update the ECR annually would risk imposing higher rates
    on non-Customer Generators. Robert Meredith, the Director of
    Pricing and Cost of Service at PacifiCorp, RMP’s parent company,
    testified that updating the ECR annually would ensure that the
    program’s costs would not shift onto customers who did not sell
    power back to RMP. Another RMP witness, Daniel MacNeill,
    similarly testified that if the PSC did not regularly update the ECR,
    ratepayers who did not participate in the program would pay higher
    rates. MacNeill also posited that annual updates would best ensure
    the ECR’s continued accuracy.
    ¶93 Vote Solar has demonstrated that there was conflicting
    evidence before the PSC. Vote Solar has not, as it must to prevail,
    23
    VOTE SOLAR v. PUBLIC SERVICE COMMISSION
    Opinion of the Court
    demonstrated that the PSC’s decision was not supported by
    substantial evidence. We affirm the PSC’s decision to update the
    ECR annually.
    V. VOTE SOLAR HAS NOT SHOWN THAT THE PSC’S DECISION
    TO HAVE ECR CREDITS EXPIRE ANNUALLY WAS NOT
    SUPPORTED BY SUBSTANTIAL EVIDENCE
    ¶94 Vote Solar asserts that the PSC’s decision to allow ECR
    credits to expire annually was not supported by substantial
    evidence. Vote Solar argues that the PSC’s only justification for
    annual expiration was to prevent “oversizing”—i.e., Customer
    Generators purchasing generating systems far beyond their needs in
    hopes of not just offsetting their own electric use but also making
    money selling power to RMP. Vote Solar further argues that this
    conclusion was faulty because the record does not support a
    conclusion that allowing credits to roll over from year to year would
    incentivize Customer Generators to oversize.
    ¶95 It bears noting, as the PSC did, that annual expiration of
    credits existed under the prior net metering program. The PSC
    nevertheless recognized that there was a legitimate policy question
    concerning credit expiration. The PSC stated that “the ECR should”
    disincentivize oversizing.
    ¶96 But the PSC did not, as Vote Solar claims, find that annual
    expiry was necessary to prevent oversizing. Rather, the PSC
    concluded that it had two options: “(1) continue annual expiration
    . . . and consider later whether the data . . . warrant elimination of the
    expiration” or “(2) eliminate annual expiration now and re-
    implement it if the empirical data warrant that action.”
    ¶97 The PSC chose the first option because, as it explained in the
    December Order, it concluded that was “more in the public interest
    and less likely to result in unexpected disruptions to” Customer
    Generators. Vote Solar does not mount a direct challenge to this
    conclusion.
    ¶98 We reverse an agency’s factual findings if they are not
    supported by substantial evidence. See UTAH CODE § 63G-4-403(4)(g).
    Since Vote Solar has not directly addressed the PSC’s wait-and-see
    approach that continued the practice of annual credit expiration that
    had been the practice for years, we are not well positioned to say
    there was not substantial evidence supporting the PSC’s decision.
    We therefore affirm the PSC’s decision that ECR credits will expire
    annually.
    24
    Cite as: 
    2023 UT 13
    Opinion of the Court
    CONCLUSION
    ¶99 The December Order from which Vote Solar seeks review
    addressed a variety of issues with respect to the creation and
    calculation of an ECR. That order did not constitute “final agency
    action” within the meaning of the Utah Administrative Procedures
    Act with respect to the ECR Calculation Decisions. This means we
    lack jurisdiction to hear Vote Solar’s challenges concerning the PSC’s
    statutory burden to analyze the costs and benefits of net metering,
    the PSC’s decision to only analyze cost-of-service costs and benefits
    when it created the ECR, and the PSC’s decision that integration
    costs should be included in the ECR calculation. We therefore lack
    jurisdiction over Vote Solar’s petition for review as to these issues
    and dismiss.
    ¶100 The December Order was “final agency action” with respect
    to the ECR Operation Decisions. This means we have jurisdiction to
    hear Vote Solar’s challenges to the decision to annually update the
    ECR and the decision to have unused credits expire annually. But we
    hold that the PSC had substantial evidence before it to support those
    decisions. We affirm.
    25