Monticello v. Public Service Commn , 2019 UT 43 ( 2019 )


Menu:
  •                  This opinion is subject to revision before final
    publication in the Pacific Reporter
    
    2019 UT 43
    IN THE
    SUPREME COURT OF THE STATE OF UTAH
    MONTICELLO WIND FARM, LLC,
    Petitioner,
    v.
    PUBLIC SERVICE COMMISSION OF UTAH,
    Respondent.
    No. 20180572
    Filed August 12, 2019
    On Petition for Review of Agency Decision
    Attorneys:
    Mary Anne Q. Wood, Stephen Q. Wood, Salt Lake City,
    for petitioner
    Michael J. Hammer, Salt Lake City, for respondent
    Public Service Commission
    Sean D. Reyes, Att’y Gen., Justin Jetter, Asst. Att’y Gen.,
    Salt Lake City, for respondent Division of Public Utilities
    Sean D. Reyes, Att’y Gen., Robert J. Moore, Asst. Att’y Gen.,
    Salt Lake City, for respondent Office of Consumer Services
    R. Jeff Richards, Yvonne R. Hogle, D. Matthew Moscon,
    R. Chad Pugh, Salt Lake City, for respondent PacifiCorp d/b/a
    Rocky Mountain Power
    JUSTICE PEARCE authored the opinion of the Court in which
    CHIEF JUSTICE DURRANT, ASSOCIATE CHIEF JUSTICE LEE,
    JUSTICE HIMONAS, and JUSTICE PETERSEN joined.
    JUSTICE PEARCE, opinion of the Court:
    INTRODUCTION
    ¶1 PacifiCorp entered into an agreement with Monticello Wind
    Farm, LLC (MWF) for the purchase of wind energy. Under Utah and
    federal law, PacifiCorp and MWF could set the terms for that
    agreement in one of two ways. They could follow the procedure set
    MONTICELLO WIND FARM v. PSC
    Opinion of the Court
    by the Public Service Commission (Commission) and fix pricing
    based on PacifiCorp’s avoided costs; that is, what it would cost
    PacifiCorp to produce the energy itself or obtain it from another
    source. In this event, the Commission, pursuant to its procedure,
    would review any executed agreement to ensure it did not exceed
    those costs. Or PacifiCorp and MWF could operate outside the
    Commission’s framework. They could negotiate their own pricing
    terms and contractually limit the scope of the Commission’s review.
    This case requires us to decide which type of contract MWF and
    PacifiCorp signed.
    ¶2 PacifiCorp submitted the agreement to the Commission for
    approval. The Commission reviewed the pricing to ensure
    consistency with PacifiCorp’s avoided costs. The pricing, however,
    was based on a methodology the Commission had discontinued.
    And the information underlying that methodology had not been
    updated for several years. For those reasons, the Commission
    concluded the pricing could not be deemed consistent with
    PacifiCorp’s avoided costs. The Commission denied the application.
    ¶3 On appeal, MWF asks us to review the Commission’s order.
    MWF primarily asserts the parties opted out of the Commission’s
    framework and, as a result, the Commission was obligated to
    approve the agreement unless its terms would seriously harm the
    public interest. This case turns on a question of contract
    interpretation and asks what type of contract the parties penned. We
    conclude the agreement was one negotiated within the
    Commission’s framework. And was therefore an agreement the
    Commission could reject if it obligated PacifiCorp to purchase
    energy at a price higher than its avoided costs. The remainder of
    MWF’s challenges are not properly before us and therefore do not
    provide MWF a path to victory. We affirm.
    BACKGROUND
    ¶4 This is not the first time we have seen these parties or been
    asked to weigh in on a conflict between the two. PacifiCorp1 and
    MWF share a contentious history, more fully outlined in an opinion
    _____________________________________________________________
    1  PacifiCorp does business in Utah as Rocky Mountain Power.
    PacifiCorp engaged in some conduct relevant to this opinion as
    PacifiCorp and in other conduct relevant to this opinion as Rocky
    Mountain Power. For purposes of this opinion, we do not
    differentiate between the two.
    2
    Cite as: 
    2019 UT 43
    Opinion of the Court
    addressing a prior chapter in this litigation. 2 See Ellis-Hall Consultants
    v. Pub. Serv. Comm’n, 
    2016 UT 34
    , ¶¶ 1–16, 
    379 P.3d 1270
     (Ellis-Hall
    II). We relate only the facts relevant to this stage of the proceedings.
    Regulatory Background
    ¶5 “To encourage the development of alternative energy
    resources, federal law requires a utility to purchase wind energy and
    other forms of alternative power from qualifying facilities at its
    avoided cost—what it would have cost the utility to generate the
    power itself or purchase it from another source.” 3 Ellis-Hall II, 
    2016 UT 34
    , ¶ 3 (footnote omitted) (citing 16 U.S.C. § 824a–3; 
    18 C.F.R. § 292.101
    ). The Federal Energy Regulatory Commission prescribes
    rules governing these transactions, including rules ensuring that the
    rates for such purchases “shall be just and reasonable to the electric
    consumers of the electric utility and in the public interest.” 4 16 U.S.C.
    _____________________________________________________________
    2  In the earlier litigation, Ellis-Hall Consultants was the entity
    embroiled in a dispute with PacifiCorp. See Ellis-Hall Consultants v.
    Pub. Serv. Comm’n, 
    2016 UT 34
    , ¶¶ 1–2, 
    379 P.3d 1270
    . Based on the
    record before us, it is our understanding that Ellis-Hall Consultants
    is the parent, owner, and developer of MWF. For purposes of this
    opinion, we do not distinguish between the two.
    3  Under our state code, a “qualifying power production facility”
    is a facility that “produces electrical energy solely by the use . . . of
    biomass, waste, a renewable resource, a geothermal resource, or any
    combination of the preceding sources;” “has a power production
    capacity that . . . is no greater than 80 megawatts;” and “is a
    qualifying small power production facility under federal law.” UTAH
    CODE § 54-2-1(25). Whether MWF is a qualifying facility is not at
    issue in this proceeding.
    4  “Under the Federal Power Act, 16 U.S.C. § 791a et seq., the
    Federal Energy Regulatory Commission (‘FERC’) is responsible for
    regulating ‘public utilities’ that offer electric power in interstate
    commerce.” Crossroads Cogeneration Corp. v. Orange & Rockland Utils.,
    Inc., 
    159 F.3d 129
    , 132 (3d Cir. 1998) (emphasis omitted). And “in
    1978, Congress modified the Federal Power Act by enacting the
    Public Utility Regulatory Policies Act (‘PURPA’), 16 U.S.C. § 823a et
    seq.,” to “control power generation costs and ensure long-term
    economic growth by reducing the nation’s reliance on oil and gas
    and increasing the use of more abundant, domestically produced
    fuels.” Id. (emphasis omitted) (citation omitted). Under PURPA,
    FERC prescribes rules “to encourage cogeneration and small power
    (continued . . .)
    3
    MONTICELLO WIND FARM v. PSC
    Opinion of the Court
    § 824a–3(a), (b)(1). And state regulatory agencies are required to
    implement those rules. Id. § 824a–3(f)(1).
    ¶6 The Utah Code contains similar provisions. 5 Utilities are
    required to “offer to purchase power from qualifying power
    producers.” UTAH CODE § 54-12-2(1). And pursuant to section 54-12-
    2, the terms for agreements between utilities and qualifying facilities
    are set in one of two ways. Under subsection (2), the Commission
    creates the process for determining the agreement’s terms and
    conditions, including the power purchase rates: “The commission
    shall establish reasonable rates, terms, and conditions for the
    purchase or sale of electricity or electrical generating capacity, or
    both, between a purchasing utility and a qualifying power
    producer.” Id. § 54-12-2(2).
    ¶7 “In establishing these rates, terms, and conditions, the
    commission shall either establish a procedure under which
    qualifying power producers offer competitive bids . . . or devise an
    alternative method which considers the purchasing utility’s avoided
    costs.” Id. And Utah law defines “avoided costs” in the same manner
    as federal law—the cost to the utility of generating the power itself
    or purchasing it from another electrical corporation. See id. § 54-2-
    1(1). Thus, under subsection (2), a utility fulfills its must-purchase
    obligation by agreeing to purchase power from a qualifying facility
    in accordance with the terms, conditions, and methodology the
    Commission sets.
    ¶8 Under subsection (3), in contrast, the Utah Code provides
    for contracts formed outside of the Commission’s framework. See id.
    § 54-12-2(3). Rather than agreeing to the purchase or sale of power
    pursuant to the Commission’s process and conditions, a utility and
    production,” which “require electric utilities to offer to” “purchase
    electric energy” from “qualifying cogeneration facilities and
    qualifying small power production facilities.” 16 U.S.C. § 824a-
    3(a)(2).
    5  Utah Code section 54-12-1 codifies the legislature’s intent to,
    e.g., “promote the more rapid development of new sources of
    electrical energy,” “remove unnecessary barriers to energy
    transactions involving independent energy producers and electrical
    corporations,” “encourage the development of independent and
    qualifying power production and cogeneration facilities,” and
    “promote a diverse array of economical and permanently sustainable
    energy resources in an environmentally acceptable manner.”
    4
    Cite as: 
    2019 UT 43
    Opinion of the Court
    qualifying facility may reach an agreement on their own terms. See
    
    id.
     And they may set the pricing: “Purchasing utilities and qualifying
    power producers may agree to rates, terms, or conditions for the sale
    of electricity or electrical capacity which differ from the rates, terms,
    and conditions adopted by the commission under Subsection (2).” 
    Id.
    ¶9 Subsection (3) thus mirrors a federal regulatory provision
    addressing “the regulation of sales and purchases between
    qualifying facilities and electric utilities.” See 
    18 C.F.R. § 292.301
    (a).
    The federal regulation provides that “[n]othing in this subpart . . .
    [l]imits the authority of any electric utility or any qualifying facility
    to agree to a rate for any purchase, or terms or conditions relating to
    any purchase, which differ from the rate or terms or conditions
    which would otherwise be required by this subpart.” 
    Id.
    § 292.301(b)(1).
    ¶10 Section 54-12-2 does not further define the Commission’s
    role with respect to these agreements. It merely provides that “[t]he
    commission may adopt further rules which encourage the
    development of small power production and cogeneration facilities.”
    UTAH CODE § 54-12-2(4). But other provisions of state law vest the
    Commission with “power and jurisdiction to supervise and regulate
    every public utility in this state,” “to supervise all of the business of
    every such public utility in this state, and to do all things, whether
    herein specifically designated or in addition thereto, which are
    necessary or convenient in the exercise of such power and
    jurisdiction.” Id. § 54-4-1. And state law requires that “[e]very public
    utility shall . . . provide . . . service . . . as will be in all respects
    adequate, efficient, just and reasonable,” and that “[a]ll rules and
    regulations made by a public utility affecting or pertaining to its
    charges or service to the public shall be just and reasonable.” Id. § 54-
    3-1.
    ¶11 Under this framework, the Commission thus administers
    the state and federal laws requiring utilities to purchase power from
    qualifying facilities. Ellis-Hall Consultants, LLC v. Pub. Serv. Comm’n,
    
    2014 UT 52
    , ¶ 21, 
    342 P.3d 256
     (Ellis-Hall I). Accordingly, “[t]he
    Commission establishes the methodology for determining avoided
    cost. It also promulgates regulatory tariffs establishing the rules for
    the negotiation and approval of power purchase agreements.” Ellis-
    Hall II, 
    2016 UT 34
    , ¶ 3. And, as noted above, the Commission
    operates under “a statutory mandate to set a rate that is in the public
    interest.” Ellis-Hall I, 
    2014 UT 52
    , ¶ 21 (citation omitted).
    ¶12 In our earlier opinion, we addressed the regulatory process
    the Commission used in its administration of must-purchase
    5
    MONTICELLO WIND FARM v. PSC
    Opinion of the Court
    agreements. Ellis-Hall II, 
    2016 UT 34
    , ¶¶ 1–16, 34–42. We examined
    the Commission’s regulatory tariff Electric Service Schedule No. 38
    (Schedule 38), which governs negotiations between a qualifying
    facility and PacifiCorp. Id. ¶ 4. And as we noted there, under
    Schedule 38, a party seeking to enter into a power purchase
    agreement with PacifiCorp must first request and obtain “indicative
    pricing,” which “is aimed at allowing the producer to make
    determinations regarding project planning, financing, and
    feasibility.” Id. ¶¶ 1, 5 (citation omitted) (internal quotation marks
    omitted). PacifiCorp is required to provide indicative pricing to a
    qualifying facility “once the facility submits certain information
    regarding a proposed project.” Id. ¶ 5. After a party receives the
    indicative pricing, that party should take “specific subsequent steps
    [identified by the Commission] . . . to be entitled to receive a draft
    power purchase agreement and to proceed toward final
    negotiation.” Id. ¶ 6.
    Prior Litigation
    ¶13 Sometime in 2012 or early 2013, MWF requested indicative
    pricing from PacifiCorp. Id. ¶¶ 2, 9. At that time, the Commission
    authorized “a ‘market proxy’ methodology for determining the
    avoided cost for wind power projects.” Id. ¶ 8. And in early 2013,
    MWF received indicative pricing based on that methodology. Id.
    ¶ 12.
    ¶14 But before MWF executed a power purchase agreement
    with PacifiCorp, the Commission changed its approach. Id. The
    Commission issued an order discontinuing use of the market proxy
    method in favor of a new method, “which allowed [PacifiCorp] to
    determine its avoided cost based on current energy production cost
    rather than the cost of the most recently executed proposal” for the
    supply of wind energy. Id. ¶¶ 8, 12. “This new methodology was
    expected to lower [PacifiCorp’s] avoided costs.” Id. ¶ 12. 6 PacifiCorp
    then rescinded its indicative pricing proposal with MWF “on the
    ground that the [Commission] had since issued an order adopting a
    new pricing methodology.” Id. ¶ 2.
    ¶15 MWF challenged PacifiCorp’s decision. Id. The Commission
    denied the challenge. Id. We reversed. Id. In Ellis-Hall II, we reviewed
    _____________________________________________________________
    6As we noted in Ellis-Hall II, “This seems to be undisputed. . . .
    [MWF] asserts” it would not be “economically feasible for [MWF] to
    proceed under the new methodology.” 
    2016 UT 34
    , ¶ 12 n.2.
    6
    Cite as: 
    2019 UT 43
    Opinion of the Court
    Schedule 38’s provisions setting out the process by which a
    qualifying facility may obtain indicative pricing from PacifiCorp. 
    Id.
    ¶¶ 4–7. We also examined two orders the Commission issued that
    are relevant to that process, including the “Phase Two” order
    providing that the market proxy method would be discontinued. 
    Id.
    ¶¶ 11–12, 34–42. And we concluded that MWF was “not required to
    submit a request for new indicative pricing.” Id. ¶ 43. MWF was
    “entitled to proceed in reliance on the methodology set forth in the
    indicative pricing proposal it received from [PacifiCorp].” Id. In so
    holding, we opined that those documents “yield a right to a wind
    power developer to rely on the methodology set forth in the
    ‘indicative pricing proposal’” it had received from PacifiCorp. Id.
    ¶ 37.
    ¶16 We explicitly and pointedly did not reach other conclusions
    about the process. We expressly left open whether MWF would have
    “a right to require [PacifiCorp] to enter into a power purchase
    agreement” and whether the Commission would be “require[d] . . .
    to approve such an agreement.” Id. ¶ 44. “Those questions [were] not
    properly presented for our review,” and we “decline[d] to reach
    them.” Id. We likewise concluded that the scope of PacifiCorp’s
    discretion, if any, not to enter into such an agreement was “not
    properly presented” for resolution. Id. ¶¶ 45–46.
    ¶17 Moreover, we expressly left unresolved the Commission’s
    assertion that any agreement reached on “a now-outdated indicative
    pricing proposal [would] ultimately be thwarted by an inevitable
    decision by the Commission to decline to approve a power purchase
    agreement based on such methodology.” Id. ¶ 47. “The Commission
    ha[d] not as yet declined to approve a power purchase agreement,”
    and we declined “to offer an advisory opinion on a matter that [was]
    not yet ripe for our review.” Id.
    ¶18 Accordingly, we reiterated that “we [were] in no position to
    decide whether [MWF] ha[d] an ultimate right to enter into a power
    purchase agreement with [PacifiCorp] or to secure approval from the
    Commission.” Id. ¶ 48. We concluded only that, “for now,” MWF
    was “entitled . . . to rely on the indicative pricing proposal it was
    provided” and “ha[d] no obligation to submit a request for new
    indicative pricing as it move[d] forward in negotiations over a
    power purchase agreement with [PacifiCorp].” Id.
    Revisions to Schedule 38
    ¶19 Nearly a year before we issued our opinion in Ellis-Hall II,
    and while that case was pending before this court, the Commission
    revised Schedule 38 (Revised Schedule 38). See Rocky Mountain Power
    7
    MONTICELLO WIND FARM v. PSC
    Opinion of the Court
    Electric Service Schedule No. 38 (2015). 7 Before the revision, Schedule
    38 did not include a specified timeframe for the expiration of
    indicative pricing proposals. See Rocky Mountain Power Electric Service
    Schedule No. 38 (2012). 8
    ¶20 In addition, Schedule 38 stated that “such prices are merely
    indicative and are not final and binding.” Id. I.B.3. Schedule 38
    further provided: “Prices and other terms and conditions are only
    final and binding to the extent contained in a power purchase
    agreement executed by both parties and approved by the
    Commission.” Id.
    ¶21 Following the changes, however, Revised Schedule 38
    included a set six-month timeframe for the parties to execute a
    power purchase agreement using a particular pricing proposal. “The
    prices in the proposed power purchase agreement . . . shall be
    recalculated . . . using the most recent available pricing inputs and
    methods approved by the Commission” if a power purchase
    agreement has not been executed “within six (6) months after
    indicative pricing was provided.” Rocky Mountain Power Electric
    Service Schedule No. 38 I.B.9 (2015).
    ¶22 Revised Schedule 38 retained language indicating that
    pricing is not final and binding until “contained in a power purchase
    agreement executed by both parties and approved by the
    Commission.” Id. I.B.4. And it expressly authorized the Commission
    to “at any time make changes to this Schedule, [qualifying facility]
    pricing methods and inputs, or terms and conditions applicable to
    [qualifying facility] pricing and power purchase agreements.” Id.
    _____________________________________________________________
    7 See UTAH PUB. SERV. COMM’N, DOCKET NO. 15-035-T10 (In the
    Matter of Rocky Mountain Power’s Filing to Comply with the
    Commission’s Order Issued on June 9, 2015, in Docket No. 14-035-140);
    UTAH PUB. SERV. COMM’N, DOCKET NO. 14-035-140 (In the Matter of the
    Review of Electric Service Schedule No. 38, Qualifying Facilities
    Procedures, and Other Related Procedural Issues).
    8 See UTAH PUB. SERV. COMM’N, DOCKET NO. 12-035-T14 (In the
    Matter of Tariff Revisions in Compliance with the Commission’s Report
    and Order in Rocky Mountain Power’s 2012 General Rate Case, Docket 11-
    035-200 dated September 19, 2012 . . . .); UTAH PUB. SERV. COMM’N,
    DOCKET NO. 11-035-200 (In the Matter of the Application of Rocky
    Mountain Power for Authority to Increase Its Retail Electric Utility
    Service Rates in Utah and for Approval of Its Proposed Electric Service
    Schedules and Electric Service Regulations).
    8
    Cite as: 
    2019 UT 43
    Opinion of the Court
    Current Dispute
    ¶23 We issued our opinion in Ellis-Hall II in July of 2016. More
    than a year later, in late 2017, MWF and PacifiCorp entered into a
    power purchase agreement (PPA). In that agreement, MWF
    expressed its intent to operate as a qualifying facility. And
    PacifiCorp agreed to purchase the wind energy MWF generated as
    well as any associated green tags. 9
    ¶24 The PPA provided that “[t]he rates, terms[,] and conditions
    in [the PPA] [were] in accordance with the rates, terms, and
    conditions approved by the Commission in Docket No. 03-035-14 for
    purchases from Qualifying Facilities.” That docket includes several
    orders issued by the Commission between 2003 and 2013, including
    the Commission’s 2005 order “resolv[ing] differences . . . regarding
    methods by which . . . indicative prices are determined for the
    purpose of negotiating agreements pursuant to Schedule No. 38.” See
    UTAH PUB. SERV. COMM’N, DOCKET NO. 03-035-14 (In the Matter of the
    Application of PacifiCorp for Approval of an IRP-based Avoided Cost
    Methodology for QF Projects Larger than One Megawatt), Oct. 31 2005
    Report and Order, at 7. In that order, the Commission approved the
    “market price proxy [method] for determination of avoided costs”
    for certain wind facilities “up to [PacifiCorp’s] . . . target megawatt
    level of wind resources.” Id. at 33.
    _____________________________________________________________
    9   Generally speaking, a green tag or “renewable energy
    certificate, or REC . . . , is a market-based instrument that represents
    the property rights to the environmental, social and other non-power
    attributes of renewable electricity generation. RECs are issued when
    one megawatt-hour (MWh) of electricity is generated and delivered
    to the electricity grid from a renewable energy resource.” Green
    Power Partnership, EPA, https://www.epa.gov/greenpower/
    renewable-energy-certificates-recs (last visited August 5, 2019).
    Along those lines, the PPA defined “green tags” as “(a) the
    Environmental Attributes associated with all Output, together with
    (b) the Green Tag Reporting Rights associated with such energy and
    Environmental Attributes, however commercially transferred or
    traded under any or other product names, such as ‘Renewable
    Energy Credits,’ ‘Green-e Certified,’ ‘Carbon Credits[,]’[] or
    otherwise. One Green Tag represents the Environmental Attributes
    made available by the generation of one MWh of energy from
    [MWF].”
    9
    MONTICELLO WIND FARM v. PSC
    Opinion of the Court
    ¶25 The PPA also expressly provided that it would not become
    effective until the Commission approved it: “This Agreement shall
    become effective when it is executed and delivered by both Parties
    and has been approved by the Commission . . . .”
    ¶26 And in a provision addressing the rights of the parties if
    PacifiCorp were to default, the PPA provided that MWF could “seek
    a new power purchase agreement with PacifiCorp . . . , though
    PacifiCorp shall not be obligated to provide in such power purchase
    agreement avoided cost prices that are higher than the avoided cost
    prices contained in this Agreement.”
    ¶27 In addition, the PPA included a Mobile-Sierra clause,
    providing that the power purchase rates would “remain in effect . . .
    absent agreement of the parties” and that “the standard of review for
    changes hereto . . . shall be the ‘public interest’ application of the
    ‘just and reasonable’ standard . . . set forth” in federal case law: 10
    Rates Not Subject to Review. The rates for service
    specified herein shall remain in effect until expiration
    of the Term, and shall not be subject to change for any
    reason, including regulatory review, absent agreement
    of the parties. Neither Party shall petition FERC
    pursuant to the provisions of Sections 205 or 206 of the
    Federal Power Act (
    16 U.S.C. § 792
     et seq.) to amend
    such prices or terms, or support a petition by any other
    person seeking to amend such prices or terms, absent
    the agreement in writing of the other Party. Further,
    absent the agreement in writing by both Parties, the
    standard of review for changes hereto proposed by a
    Party, a non-party or the FERC acting sua sponte shall
    be the “public interest” application of the “just and
    reasonable” standard of review set forth in United Gas
    Pipe Line Co. v. Mobile Gas Service Corp., 
    350 U.S. 332
    (1956) and Federal Power Commission v. Sierra Pacific
    _____________________________________________________________
    10 As the United States Supreme Court has explained, “Under
    th[e] Court’s Mobile–Sierra doctrine, FERC must presume that a rate
    set by a freely negotiated wholesale-energy contract meets the
    statutory just and reasonable requirement” applicable to such
    contracts. NRG Power Mktg., LLC v. Me. Pub. Utils. Comm’n, 
    558 U.S. 165
    , 167 (2010) (citation omitted) (internal quotation marks omitted).
    “The presumption may be overcome only if FERC concludes that the
    contract seriously harms the public interest.” 
    Id.
     (citation omitted).
    10
    Cite as: 
    2019 UT 43
    Opinion of the Court
    Power Co., 
    350 U.S. 348
     (1956) and clarified by Morgan
    Stanley Capital Group. Inc. v. Public Util. Dist. No. 1 of
    Snohomish, 
    554 U.S. 527
    , 
    128 S. Ct. 2733
     (2008).
    ¶28 Finally, the PPA included a provision indicating that it
    constituted the “entire agreement” between the parties: “Entire
    Agreement[:] This Agreement supersedes all prior agreements,
    proposals, representations, negotiations, discussions or letters,
    whether oral or in writing, regarding the subject matter hereof. No
    modification hereof shall be effective unless it is in writing and
    executed by both Parties.”
    ¶29 PacifiCorp submitted the PPA in an application to the
    Commission, requesting an order approving the PPA and finding
    the terms “just and reasonable and in the public interest.” The
    application noted that “PacifiCorp is obligated to purchase power
    from qualifying facilities,” and “[i]n accordance with” Ellis-Hall II,
    “the [PPA] uses the proxy method for pricing the energy produced”
    by MWF.11
    ¶30 MWF intervened in the proceeding. Two other entities also
    made appearances, 12 each arguing that the application should be
    denied. The Division of Public Utilities (DPU) moved for summary
    judgment asserting the PPA did not comply with Revised Schedule
    38’s timelines. And the Office of Consumer Services (OCS) moved
    for summary judgment asserting the avoided cost calculations
    _____________________________________________________________
    11  To the extent PacifiCorp’s application suggests that, under
    Ellis-Hall II, PacifiCorp was obligated to purchase power in
    accordance with indicative pricing it had provided under the
    Commission’s market proxy methodology, we note that issue is not
    directly before us. And that conclusion implicates questions we did
    not resolve, and expressly left open, in Ellis Hall II. See Ellis-Hall II,
    
    2016 UT 34
    , ¶¶ 44–48.
    12  See UTAH CODE § 54-4a-1(1)(a) (providing that the Division of
    Public Utilities may “appear as a party” and “otherwise participate
    in proceedings before the Public Service Commission”); id. § 54-10a-
    203(2) (providing for the Office of Consumer Services to be
    represented “at a hearing or other proceeding affecting the services,
    rates, or charges of an applicable public utility”); id. § 54-10a-301
    (setting out the Office of Consumer Services’ power and duty to
    advocate positions advantageous to residential and small
    commercial consumers).
    11
    MONTICELLO WIND FARM v. PSC
    Opinion of the Court
    contained in the PPA were not timely calculated as required by
    federal regulations. See 
    18 C.F.R. § 292.304
    (d) (providing that, with
    respect to qualifying facilities, power purchase rates “shall” be based
    on the purchasing utility’s avoided costs “calculated at the time of
    delivery” or “at the time the obligation is incurred”). PacifiCorp
    stayed mute, taking “no legal position” on the motions and leaving
    MWF to defend the application on its own.
    ¶31 In response, MWF asserted, in relevant part, that Revised
    Schedule 38 could not be applied retroactively. MWF claimed that
    the Commission lacked authority to apply orders retroactively, both
    as a general principle and in this particular circumstance, because
    MWF had, in its own estimation, “submitted every document and
    complied with every provision under Original Schedule 38 before
    [the revised schedule] took effect.” According to MWF, it had
    “begun the Schedule 38 process and would have executed a PPA”
    under the earlier version of Schedule 38 “had PacifiCorp not refused
    to proceed with negotiations . . . under its earlier indicative pricing.”
    ¶32 In addition, MWF pointed to Ellis-Hall II and asserted it had
    a right to rely on the market proxy methodology for purposes of the
    PPA. MWF also claimed that it had incurred a legally enforceable
    obligation 13 with PacifiCorp, prior to execution of the PPA and prior
    to the Commission’s Phase Two order altering the method for
    calculating avoided costs. On those grounds, MWF alleged, the
    Commission could not reject the PPA based on its reliance on the
    market proxy methodology.
    ¶33 Finally, MWF threw in a reference to subsection (3) of
    section 54-12-2. Citing that provision, MWF briefly asserted that
    _____________________________________________________________
    13 Qualifying facilities have the option of providing energy to a
    purchasing utility “pursuant to a legally enforceable obligation.” 
    18 C.F.R. § 292.304
    (d). FERC has explained that “[s]ection 292.304(d)
    and the requirement that a [qualifying facility] can sell and a utility
    must purchase pursuant to a legally enforceable obligation were
    specifically adopted to prevent utilities from circumventing the
    requirement of PURPA that utilities purchase energy and capacity
    from [qualifying facilities].” Cedar Creek Wind, LLC, 
    137 FERC ¶ 61006
    , ¶ 32 (Oct. 4, 2011). “Thus, . . . if the electric utility refuses to
    sign a contract, the [qualifying facility] may seek state regulatory
    authority assistance to enforce the PURPA-imposed obligation on
    the electric utility . . . and a non-contractual, but still legally
    enforceable, obligation will be created . . . .” 
    Id.
    12
    Cite as: 
    2019 UT 43
    Opinion of the Court
    PacifiCorp and MWF were “not limited” to the rates, terms, and
    conditions the Commission set, but had “negotiated” their own
    terms, and “nothing in the PPA require[d] the [Commission] to first
    find that the rates, terms, and conditions [were] consistent with any
    order of the [Commission] before approving the PPA.”
    ¶34 The Commission granted both motions for summary
    judgment. The Commission noted that, for purposes of the parties’
    agreement, the “prices [PacifiCorp] agree[d] to pay in the PPA are
    the same as those it provided in [its] 2013 Indicative Pricing
    [Proposal].” And the Commission concluded that, “on its face,” the
    application “fails to comply with Schedule 38 and uses outdated
    avoided cost pricing that is not reflective of [PacifiCorp’s] Must
    Purchase Obligation under applicable law.”
    ¶35 To reach that conclusion, the Commission first noted that
    PacifiCorp sought an order approving the PPA. The Commission
    observed that “[t]he requested relief [was] consistent with Schedule
    38[,] which articulates a requirement for [Commission] approval
    prior to the agreements becoming effective.” The Commission then
    opined on its role with respect to approval of the PPA. Citing much
    of the regulatory background noted above, the Commission
    characterized its “primary role” in evaluating the application as
    determining “whether the rates are in the ‘public interest’ and, more
    specifically, do not exceed avoided costs.”
    ¶36 The Commission then turned to the calculation of avoided
    costs the PPA used. Applying Revised Schedule 38, the Commission
    noted that “avoided cost pricing for [qualifying facilities’] PPAs in
    Utah is ordinarily calculated at the time the [qualifying facility]
    receives indicative pricing, provided the [qualifying facility] enters
    [into] a PPA within six months.” Because MWF did not enter into a
    power purchase agreement within that timeframe, but sought
    approval of an agreement executed in 2017, which incorporated
    pricing methodology discontinued in 2013, the application
    “foreclose[d]” the Commission from “finding the PPA’s pricing
    accurately reflects avoided costs under Schedule 38.”
    ¶37 And with respect to MWF’s reliance on Ellis-Hall II as a basis
    for those pricing terms, the Commission highlighted the questions
    we expressly left open in that opinion, and concluded that Ellis-Hall
    II did “not necessarily . . . require[]” PacifiCorp to enter into the PPA
    or require that the Commission approve such an agreement. The
    Commission suggested that a contrary interpretation of Ellis-Hall II
    would conflict with federal law.
    13
    MONTICELLO WIND FARM v. PSC
    Opinion of the Court
    ¶38 With regard to “whether [Revised] Schedule 38’s six-month
    time period for execution is applicable to the PPA,” the Commission
    concluded that it “plainly [was].” “There is nothing retroactive about
    applying tariff provisions that have been effective since August 2015
    to a PPA executed in December 2017.”
    ¶39 But, notably, the Commission also concluded that “it ma[de]
    no difference” which version of Schedule 38 applied. “[N]othing in
    Former Schedule 38 vested a [qualifying facility], who had obtained
    indicative pricing, to compel [PacifiCorp] to enter a contract years
    later based on stale pricing.” The terms of “Former Schedule 38
    expressly provided [that PacifiCorp] ‘will update its pricing
    proposals at appropriate intervals to accommodate any changes to
    [its] avoided-cost calculations.’” (Second alteration in original.) And
    the Commission’s “role in applying Schedule 38 (in any of its
    iterations) and approving PPAs is to ensure . . . [PacifiCorp] pays no
    more than its avoided cost.” Accordingly, the Commission
    concluded, “[w]hether we apply Former Schedule 38 or current
    Schedule 38, we cannot find that [the PPA’s] pricing reflects the
    avoided cost rates [PacifiCorp] must pay to satisfy its Must Purchase
    Obligation.”
    ¶40 The Commission did not reach any conclusion “as to
    whether MWF may demonstrate a [legally existing obligation] prior
    to the execution of its PPA in December 2017” and left open the
    opportunity for MWF to do so.14 In addition, the Commission did
    not expressly address MWF’s fleeting assertion that under
    subsection (3) of section 54-12-2, the Commission could approve the
    PPA even if it did not comply with the Commission’s pricing
    methodology.
    ¶41 MWF petitioned the Commission for reconsideration and
    rehearing. MWF asserted that by June of 2013, it had established a
    _____________________________________________________________
    14 The Commission opened a separate docket “for the purpose of
    adjudicating [MWF’s] assertion that a legally enforceable obligation
    (‘LEO’) existed as of June 25, 2013.” But MWF asked the Commission
    to terminate that docket, explaining that it planned to seek judicial
    review of the Commission order at issue here. In response to MWF’s
    request, the Commission stayed the docket, stating that it would not
    take “further action on the matter . . . until and unless a party
    requests otherwise.” No questions regarding the existence of a
    legally existing obligation have been raised in this proceeding, and
    we do not address that issue here.
    14
    Cite as: 
    2019 UT 43
    Opinion of the Court
    legally existing obligation with PacifiCorp for the purchase of wind
    energy, and MWF “elected to administer the legally enforceable
    obligation” through the PPA executed in 2017. On that basis, MWF
    asked that the Commission alter its order.
    ¶42 In support, MWF asserted two claims. First, MWF asked for
    summary approval of the application based on the existence of a
    legally enforceable obligation and a negotiated-rate contract.
    According to MWF, the Commission had erred by “rejecting a
    negotiated rate contract that [was] fully[ ]compliant with federal law,
    as the PPA . . . fairly administer[ed] the legally enforceable
    obligation . . . [PacifiCorp] incurred in 2013 to purchase [energy]
    from [MWF] at an avoided-cost rate computed on the Market Proxy
    methodology.” MWF asserted that the PPA—permitting PacifiCorp
    to purchase energy from MWF, obtain the associated green tags, and
    avoid “substantial litigation expenses”—“represent[ed] a resolution
    to a complex case,” and “nothing in federal law” restricted
    PacifiCorp’s “ability to agree to pay . . . a rate in excess of an avoided
    cost proxy methodology.” Therefore, in MWF’s view, “[t]he factual
    record, clearly establishing a legally enforceable obligation was
    incurred on or before June 25, 2013, provide[d] a sufficient basis for
    the [Commission] to summarily approve” the application.
    ¶43 In the alternative, “[i]f the [Commission] decline[d] to
    summarily affirm the . . . contract that set[] forth the terms and
    conditions by which the legally enforceable obligation . . . [would] be
    administered, then [MWF] request[ed] that the [Commission] grant
    rehearing and issue findings of fact and conclusions of law” in
    MWF’s favor. MWF requested that the Commission conclude, as a
    matter of law, that “[MWF] established a legally enforceable
    obligation on or about June 25, 2013,” that “[a]s of June 25, 2013,
    [PacifiCorp] was obligated to calculate the avoided cost by reliance
    on the Market Proxy methodology,” and that “[PacifiCorp] [was]
    obligated to purchase the output from [MWF] pursuant to the terms
    and conditions of [the PPA].”
    ¶44 In the context of this alternative argument, asserting a
    legally enforceable obligation requiring PacifiCorp to purchase
    power from MWF under the market proxy methodology, MWF
    briefly addressed the Commission’s application of Revised Schedule
    38. “[MWF] request[ed] that the [Commission] reconsider its
    conclusion that the Schedule 38 Tariff put into effect in June 2015
    governs either the negotiated-rate contract voluntarily executed by
    the parties in 2017 or the legally enforceable obligation incurred by
    [PacifiCorp] in June 2013.” MWF claimed the application of Revised
    Schedule 38 constituted an impermissible collateral attack on Ellis-
    15
    MONTICELLO WIND FARM v. PSC
    Opinion of the Court
    Hall II and was “arbitrary, capricious, inconsistent with reasoned
    decisionmaking and violate[d] the rule against retroactive
    rulemaking.” MWF did not address the portion of the Commission’s
    order concluding it was inconsequential whether it applied the
    revised or earlier version of Schedule 38.
    ¶45 The Commission denied MWF’s petition. The Commission
    did not delve into the arguments MWF raised, but stated that “[f]or
    all of the reasons enumerated” in its prior order, the Commission
    “affirm[ed] [its] conclusion that the PPA . . . failed to comply with
    Schedule 38 and employed outdated avoided cost pricing . . . not
    reflective of [PacifiCorp’s] obligation to purchase power from
    qualifying facilities under applicable law.” MWF filed a petition for
    review with this court.
    STANDARD OF REVIEW
    ¶46 “[A]gency decisions premised on pure questions of law are
    subject to non-deferential review for correctness.” Ellis-Hall II, 
    2016 UT 34
    , ¶ 27.
    ANALYSIS
    ¶47 MWF raises a number of challenges to the Commission’s
    order denying PacifiCorp’s application for approval of the PPA.
    MWF first asserts PacifiCorp and MWF “had an unambiguous right
    to enter into the PPA without adhering to [the Commission’s]
    regulations regarding avoided costs.” On that basis, MWF claims the
    Commission could reject the PPA’s pricing terms only upon a
    showing that they would seriously harm the public interest. And
    according to MWF, no such showing was made. Second, MWF
    asserts the Commission erred in its interpretation and retroactive
    application of Revised Schedule 38. Finally, MWF asserts a number
    of constitutional violations with respect to Revised Schedule 38.
    I. MWF Fails to Demonstrate That the PPA’s Pricing
    Terms and Avoided Cost Methodology Were Not
    Subject to Commission Review and Approval
    ¶48 The central issue on appeal asks whether the Commission
    exceeded the scope of its authority in reviewing and rejecting
    PacifiCorp’s application for approval of the PPA. And that question
    turns on whether we view the application as containing pricing
    settled on as a result of the parties’ negotiations, pursuant to Utah
    Code section 54-12-2(3), or as dictated by the Commission’s
    regulatory framework, pursuant to Utah Code section 54-12-2(2) and
    Schedule 38. The Commission treated the application as falling into
    the latter category and rejected the application because it did not
    16
    Cite as: 
    2019 UT 43
    Opinion of the Court
    find the PPA’s pricing terms to be equal to or less than PacifiCorp’s
    avoided costs. For that reason, the Commission did not find the
    PPA’s pricing terms to be in the “public interest.”
    ¶49 With respect to the kind of contract the parties’ submitted
    and the review it warranted, the Commission explained that it
    reviewed the PPA under a provision of Schedule 38 providing that
    “[p]rices and other terms and conditions” of agreements executed
    between PacifiCorp and qualifying facilities “are only final and
    binding to the extent . . . approved by the Commission.” See Rocky
    Mountain Power Electric Service Schedule No. 38 I.B.4 (2015). 15
    ¶50 This review was appropriate, the Commission explained,
    because PacifiCorp had submitted the PPA to the Commission
    requesting an order approving the PPA and finding its terms and
    conditions “just and reasonable and in the public interest.” The
    Commission observed that this “requested relief [was] consistent
    with Schedule 38[,] which articulates a requirement for
    [Commission] approval prior to [an agreement between PacifiCorp
    and a qualifying facility] becoming effective.” And when reviewing
    contracts submitted in accordance with Schedule 38, the Commission
    reasoned, its “primary role is to find whether the rates are in the
    ‘public interest’ and, more specifically, do not exceed avoided costs.”
    The Commission thus reviewed the PPA under a Schedule 38
    provision providing for approval of contracts negotiated within that
    framework.
    ¶51 Schedule 38 outlines the Commission-approved process for
    negotiating power purchase agreements between PacifiCorp and
    qualifying facilities. See Rocky Mountain Power Electric Service Schedule
    No. 38. Under that schedule, a qualifying facility may obtain
    indicative pricing from PacifiCorp and then, based on that pricing,
    proceed toward execution of a final agreement. 
    Id.
     I.B. PacifiCorp
    calculates indicative pricing based on a Commission-approved
    methodology aimed at capturing PacifiCorp’s avoided costs. See 
    id.
    I.B.4. As noted above, Schedule 38 provides that indicative pricing
    _____________________________________________________________
    15 In a separate argument, MWF asserts the Commission should
    have reviewed the PPA under an earlier version of Schedule 38. See
    infra ¶ 75. But whether the PPA is subject to Commission review
    pursuant to Schedule 38 does not depend on which version of the
    schedule we reference. And for purposes of our review here, we cite
    to the revised schedule.
    17
    MONTICELLO WIND FARM v. PSC
    Opinion of the Court
    does not become final until the parties execute an agreement and the
    Commission approves. 
    Id.
    ¶52 MWF challenges the Commission’s order, arguing the
    Commission erroneously invoked Schedule 38 as a basis for
    reviewing the PPA. And therefore, according to MWF, the
    Commission applied the wrong type of review. MWF claims that the
    level of review in which the Commission engaged applies only when
    a utility and qualifying facility enter into an agreement incorporating
    the rates, terms, and conditions the Commission specifies in
    Schedule 38. In contrast, when parties operate outside of the
    Commission’s rules and negotiate their own terms, an agreement
    cannot be rejected, MWF asserts, unless its terms would seriously
    harm the public interest or the parties contractually grant the
    Commission greater review authority. According to MWF,
    PacifiCorp and MWF negotiated outside Schedule 38’s framework
    and, as a result, the PPA provides for limited Commission review.
    ¶53 Utah Code section 54-12-2 lends the backbone of MWF’s
    argument. Subsection (1) provides that “[p]urchasing utilities shall
    offer to purchase power from qualifying power producers.”
    ¶54 Under subsection (2), the Commission controls the process:
    The commission shall establish reasonable rates, terms,
    and conditions for the purchase or sale of electricity or
    electrical generating capacity, or both, between a
    purchasing utility and a qualifying power producer. In
    establishing these rates, terms, and conditions, the
    commission shall either establish a procedure under
    which qualifying power producers offer competitive
    bids for the sale of power to purchasing utilities or
    devise an alternative method which considers the
    purchasing utility’s avoided costs. The capacity
    component of avoided costs shall reflect the purchasing
    utility’s long-term deferral or cancellation of
    generating units which may result from the purchase
    of power from qualifying power producers.
    UTAH CODE § 54-12-2(2).
    ¶55 MWF’s argument focuses on subsection (3), under which a
    qualifying facility and purchasing utility may negotiate their own
    terms. “Purchasing utilities and qualifying power producers may
    agree to rates, terms, or conditions for the sale of electricity or
    18
    Cite as: 
    2019 UT 43
    Opinion of the Court
    electrical capacity which differ from the rates, terms, and conditions
    adopted by the commission under Subsection (2).” 
    Id.
     § 54-12-2(3). 16
    When parties negotiate pricing pursuant to subsection (3), MWF
    asserts, those terms may be set aside by the Commission only upon a
    showing that they seriously harm the public interest, unless the
    parties contractually agree to grant the Commission greater review
    authority.
    ¶56 MWF’s initial premise is largely undisputed. The
    Commission agrees that PacifiCorp may, and often does, enter into
    power purchase agreements that are not based on the Commission’s
    methodology for calculating avoided costs and are not subject to
    Commission approval for compliance. 17 And we agree with MWF
    that the parties could operate outside of the Commission’s
    framework and enter into an agreement containing rates, terms, and
    conditions that differ from those the Commission prescribes. Heavily
    contested, however, is whether that is what PacifiCorp and MWF
    actually did.
    ¶57 The problem with MWF’s argument is that it largely ends
    here. Having demonstrated that parties may negotiate power
    purchase rates outside of Schedule 38, the next step in MWF’s
    argument would be to establish, as a matter of contract
    interpretation, that the parties did exactly that. But in its principal
    brief, MWF takes this issue almost entirely for granted. In other
    words, to paraphrase Dr. Ian Malcolm, MWF’s brief is so
    preoccupied with whether or not it could enter into such an
    agreement, it doesn’t stop to demonstrate that it did.
    ¶58 With respect to this central question of contract
    interpretation, MWF gives us the following line: “There can be no
    doubt that the Commission lacked the authority to enforce its tariff,
    Schedule 38, against the PPA, because the PPA was entered into by
    [PacifiCorp] and [MWF] under 
    18 C.F.R. § 292.301
    (b) and 
    Utah Code Ann. § 54-12-2
    (3).” Examining MWF’s brief for further development
    of this point, we find precious little.
    _____________________________________________________________
    16 See also 
    18 C.F.R. § 292.301
    (b)(1) (“Nothing in this subpart . . .
    [l]imits the authority of any electric utility or any qualifying facility
    to agree to a rate for any purchase, or terms or conditions relating to
    any purchase, which differ from the rate or terms or conditions
    which would otherwise be required by this subpart . . . .”).
    17 The record before us does not provide visibility into how often
    PacifiCorp enters into these types of contracts.
    19
    MONTICELLO WIND FARM v. PSC
    Opinion of the Court
    ¶59 Whether PacifiCorp and MWF negotiated an agreement
    outside of the Commission’s Schedule 38 framework is a question of
    contract interpretation. And when interpreting contracts, “we first
    look at the plain language [of the contract] to determine the parties’
    meaning and intent.” Brady v. Park, 
    2019 UT 16
    , ¶ 53, --- P.3d ---
    (alteration in original) (citation omitted). “If the language within the
    four corners of the contract is unambiguous, the parties’ intentions
    are determined from the plain meaning of the contractual language,
    and the contract may be interpreted as a matter of law.” 
    Id.
     (citation
    omitted). “[W]here a contractual term or provision is ambiguous as
    to what the parties intended, the question becomes a question of fact
    to be determined by the fact-finder.” 
    Id.
    ¶60 The PPA provided that “[t]he rates, terms[,] and conditions
    in [the PPA] [were] in accordance with the rates, terms, and
    conditions approved by the Commission in Docket No. 03-035-14 for
    purchases from Qualifying Facilities.” That docket includes the
    Commission’s 2005 order “resolv[ing] differences . . . regarding
    methods by which . . . indicative prices are determined for the
    purpose of negotiating agreements pursuant to Schedule No. 38.” See
    UTAH PUB. SERV. COMM’N, DOCKET NO. 03-035-14 (In the Matter of the
    Application of PacifiCorp for Approval of an IRP-based Avoided Cost
    Methodology for QF Projects Larger than One Megawatt), Oct. 31, 2005
    Report and Order, at 7.
    ¶61 And in that 2005 order, the Commission approved the
    “market price proxy [method] for determination of avoided costs”
    for certain wind facilities “up to [PacifiCorp’s] . . . target megawatt
    level of wind resources.” 
    Id. at 33
    . The PPA thus purported to be
    consistent with pricing principles the Commission set as part of its
    process for obtaining an executed agreement under Schedule 38.
    ¶62 The PPA also expressly provided, consistent with Schedule
    38, that it would not become effective until the Commission
    approved: “This Agreement shall become effective when it is
    executed and delivered by both Parties and has been approved by
    the Commission . . . .”
    ¶63 Moreover, in an approach again consistent with Schedule 38
    and the Commission’s methodology for determining pricing, the
    PPA expressly characterized its pricing terms as being based on
    avoided costs. The PPA provided that MWF could “seek a new
    power purchase agreement with PacifiCorp . . . , though PacifiCorp
    shall not be obligated to provide in such power purchase agreement
    avoided cost prices that are higher than the avoided cost prices
    contained in this Agreement.” (Emphasis added.)
    20
    Cite as: 
    2019 UT 43
    Opinion of the Court
    ¶64 Finally, the PPA included a provision indicating that it
    constituted the “entire agreement” between the parties: “This
    Agreement supersedes all prior agreements,                   proposals,
    representations, negotiations, discussions or letters, whether oral or
    in writing, regarding the subject matter hereof. No modification
    hereof shall be effective unless it is in writing and executed by both
    Parties.” As OCS and DPU assert, and MWF appears not to contest,
    this provision indicates the contract is “integrated,” meaning that
    “parol evidence is . . . not admissible to vary or contradict the clear
    and unambiguous terms of the contract.” Tangren Family Tr. v.
    Tangren, 
    2008 UT 20
    , ¶ 11, 
    182 P.3d 326
     (citation omitted) (internal
    quotation marks omitted).
    ¶65 We are therefore presented with an integrated contract that
    expressly relies on, and purports to be consistent with, the
    framework set out in Schedule 38 and the Commission’s
    methodology for determining pricing. The leap MWF’s position
    requires us to make is that this Commission-driven methodology
    and pricing were selected, not because the parties intended to
    operate within the contours of Schedule 38, but because the parties
    intended to operate outside it. And we must reach that conclusion
    even though, consistent with Schedule 38, the PPA expressly
    contemplates Commission approval prior to becoming effective.
    ¶66 MWF does not discuss these portions of the PPA. Instead,
    MWF hones in on three other aspects of the PPA. And MWF uses
    these three provisions to argue that the PPA reflects that the parties
    negotiated outside of the Commission’s Schedule 38 framework.
    ¶67 First, as MWF points out, the PPA’s pricing terms do not
    reflect the Commission’s current methodology for calculating
    avoided costs. Rather, to calculate the cost, the pricing terms rely on
    a discontinued methodology—albeit one the Commission previously
    endorsed (and the same one we addressed in Ellis-Hall II). That
    discrepancy, MWF asserts, takes the contract outside of Schedule 38
    and demonstrates an agreed-upon intent to depart from a
    Commission-controlled process. In other words, because the PPA
    incorporates an allegedly out-of-date methodology for capturing
    avoided costs, MWF alleges the parties must have intended pricing
    not reflective of avoided costs or subject to robust Commission
    review.
    ¶68 But MWF’s reading has the potential to nullify the
    Commission’s role in approving agreements entered into under
    subsection (2). Particularly if, as the Commission stated in its order
    and no one has disputed here, the Commission’s “primary role” in
    21
    MONTICELLO WIND FARM v. PSC
    Opinion of the Court
    reviewing such contracts is to determine that the pricing terms “do
    not exceed avoided costs.” Under MWF’s approach, if the
    Commission reviewed what appeared to be a subsection (2) contract,
    but concluded the agreement’s power purchase rates were not
    consistent with Schedule 38 and the Commission’s avoided-cost
    methodology, the Commission should simply conclude that the
    parties intended a subsection (3) contract.
    ¶69 Moreover, MWF’s interpretation falls apart in light of the
    abundance of other provisions that demonstrate the parties intended
    to operate consistent with Schedule 38’s framework. For example,
    MWF offers no explanation for the PPA provisions that call for
    Commission approval, characterize the pricing as based on avoided
    costs, and profess compliance with the Commission-approved
    methodology generated in accordance with the process Schedule 38
    outlines. Perhaps an argument might be crafted that would
    reasonably explain why all of these terms would exist in an
    agreement reached by parties who have no intention of operating in
    a Schedule 38 world. But we do not have that argument before us,
    and we are not at liberty to make it for MWF.
    ¶70 MWF next cites the PPA’s Mobile-Sierra clause. That
    provision provides that the power purchase rates would “remain in
    effect . . . absent agreement of the parties” and “the standard of
    review for changes hereto . . . shall be the ‘public interest’ application
    of the ‘just and reasonable’ standard . . . set forth” in federal case
    law. Under that standard, MWF proposes, a regulatory body—
    including the Commission—may review the PPA’s power purchase
    rates only to determine if they would seriously harm the public
    interest.
    ¶71 The Commission and PacifiCorp, as well as OPC and DPU,
    disagree with MWF’s reading of that provision, however, and
    provide an alternative explanation of its meaning. They assert the
    Mobile-Sierra clause becomes effective only after the Commission
    approves the PPA, and it applies only to any subsequent review of
    the agreement by federal regulatory bodies. This interpretation is
    supported by the provision’s text, which twice mentions potential
    review by a federal regulatory body—not the Commission—and
    refers to the PPA’s rates as “remain[ing] in effect,” which, as noted
    above, may occur only after Commission approval.
    ¶72 When read in light of the PPA’s other provisions, which tie
    the agreement to the Commission’s methodology for determining
    avoided-cost pricing and require approval consistent with Schedule
    38, we would be hard-pressed to read the Mobile-Sierra clause as
    22
    Cite as: 
    2019 UT 43
    Opinion of the Court
    taking the PPA outside the realm of Schedule 38 and subjecting it to
    a remarkably different review process. Were we to read the Mobile-
    Sierra clause in the manner MWF advocates, we would still lack any
    attempt from MWF to harmonize that interpretation with the PPA’s
    remaining provisions. In contrast, Respondents’ interpretation of the
    Mobile-Sierra clause is consistent with its language and the PPA’s
    other terms.
    ¶73 Finally, MWF asserts that because it agreed to transfer any
    associated green tags to PacifiCorp, that, “by itself, was enough to
    take the PPA outside the standard ‘avoided cost’ rules.” We
    disagree. Many of the PPA’s terms may have some effect on the total
    cost to PacifiCorp of acquiring energy from MWF. But those
    peripheral effects on total cost do not alter the question before us:
    whether the parties entered into an agreement not to be bound by
    Schedule 38 or Commission review of whether the power purchase
    rates were consistent with PacifiCorp’s avoided costs. Moreover, the
    Commission’s 2005 order issued in Docket No. 03-035-14 instructs
    that green tag ownership is a contractual issue between the
    qualifying facility and PacifiCorp. See UTAH PUB. SERV. COMM’N,
    DOCKET NO. 03-035-14 (In the Matter of the Application of PacifiCorp for
    Approval of an IRP-based Avoided Cost Methodology for QF Projects
    Larger than One Megawatt), Oct. 31 2005 Report and Order, at 34. In
    other words, negotiation of green tag ownership is as consistent with
    an agreement reached within the Schedule 38 framework as it would
    be with an agreement reached by parties negotiating their own
    terms.
    ¶74 Accordingly, we find no ambiguity about what the parties
    intended the PPA to be. MWF has failed to establish that the PPA’s
    avoided-cost methodology was not subject to Commission review
    pursuant to Schedule 38. MWF has also failed to establish that the
    PPA’s pricing terms could be rejected by the Commission only upon
    a showing that they would seriously harm the public interest.
    II. MWF Protests the Commission’s Application of
    Revised Schedule 38, But Left Unaddressed the
    Alternative Basis of the Commission’s Order
    ¶75 MWF next claims that if the PPA’s pricing terms and
    methodology are subject to Commission review under Schedule 38,
    the Commission should have applied the earlier version of that
    schedule. In addition, according to MWF, the terms of Revised
    Schedule 38 did not support rejection of the PPA. As MWF puts it,
    “it was error to apply the 2015 Schedule 38 retroactively. And, even
    23
    MONTICELLO WIND FARM v. PSC
    Opinion of the Court
    if the 2015 Schedule 38 were applicable retroactively, it was error to
    read it to require rejection of” the PPA.
    ¶76 The Commission did not, however, merely reject the PPA
    based on its conclusion that Revised Schedule 38 applied. Under a
    heading in the Commission’s order entitled, “The PPA is subject to
    Schedule 38, but the outcome would not be different were Former
    Schedule 38 applicable,” the Commission concluded that “it makes
    no difference whether Schedule 38 or Former Schedule 38 applies
    because nothing in Former Schedule 38 vested a [qualifying facility],
    who had obtained indicative pricing, to compel [PacifiCorp] to enter
    a contract years later based on stale pricing.” The Commission
    continued, “Our Order Revising Schedule 38 provided greater
    specificity to the process, but it did not . . . alter [the Commission’s]
    role or the underlying law.” “Whether we apply Former Schedule 38
    or current Schedule 38, we cannot find that [the PPA’s] pricing
    reflects the avoided costs [PacifiCorp] must pay to satisfy its Must
    Purchase Obligation.”
    ¶77 To reach these conclusions, the Commission addressed the
    questions we expressly left open in Ellis-Hall II: whether MWF
    would have “a right to require [PacifiCorp] to enter into a power
    purchase agreement” based on market proxy indicative pricing and
    whether the Commission would be “require[d] . . . to approve such
    an agreement.” Ellis-Hall II, 
    2016 UT 34
    , ¶ 44; see also id. ¶ 47
    (reaching no conclusion as to the assertion that any agreement
    reached based on “a now-outdated indicative pricing proposal
    [would] ultimately be thwarted by an inevitable decision by the
    Commission to decline to approve a power purchase agreement
    based on such methodology”). The Commission ultimately
    concluded that the result would be the same under the earlier or
    revised version of Schedule 38—the Commission would not approve
    the PPA.
    ¶78 MWF does not, in its opening brief, acknowledge this
    alternative basis for the Commission’s decision to reject the PPA. A
    party challenging an agency order “bear[s] the burden of adequately
    briefing all independent bases of the order from which they appeal.”
    Living Rivers v. Exec. Dir. of the Utah Dep’t of Envt’l Quality, 
    2017 UT 64
    , ¶ 25, 
    417 P.3d 57
     (citing Simmons Media Grp. v. Waykar, LLC, 
    2014 UT App 145
    , ¶ 32, 
    335 P.3d 885
     (“This court will not reverse a ruling
    of the [district] court that rests on independent alternative grounds
    where the appellant challenges only one of those grounds.”
    (alteration in original) (citation omitted))). Here, however, MWF has
    failed to address the Commission’s alternative ground for its order—
    that the result would have been the same under the earlier version of
    24
    Cite as: 
    2019 UT 43
    Opinion of the Court
    Schedule 38 for which MWF advocates. Thus, even were MWF to
    prevail on its argument, it would not be entitled to the relief it seeks,
    as an alternative basis for the Commission’s order would remain
    intact.
    ¶79 MWF’s only response to this portion of the Commission’s
    order appears in its reply brief: a few cursory sentences asserting
    that the Commission simply got it wrong. But whether MWF’s
    conclusory argument is too little is beside the point—the argument
    comes too late.
    ¶80 “It is well settled that issues raised . . . in the reply brief that
    were not presented in the opening brief are considered waived and
    will not be considered by the appellate court.” Allen v. Friel, 
    2008 UT 56
    , ¶ 8, 
    194 P.3d 903
     (citation omitted) (internal quotation marks
    omitted). Our appellate rules provide an opportunity “to respond[]
    to the facts and arguments raised” in an appellee’s or respondent’s
    “principal brief.” UTAH R. APP. P. 24(b). But the opportunity to
    “respond” is not a license to gap-fill missing arguments. When a
    respondent’s brief points out that an issue is unpreserved or an
    alternative ground is unchallenged, a petitioner may not “respond”
    with newly crafted substantive arguments as to that issue or ground.
    The timely presentation of arguments is essential to providing an
    opposing party with a fair opportunity to respond.
    ¶81 That principle is fully at play here. Until its reply brief,
    MWF had provided no substantive argument as to the Commission’s
    authority to reject the PPA under the earlier version of Schedule 38.
    No argument as to the Commission’s role, under that schedule, in
    reviewing an agreement that incorporated years-old pricing based
    on methodology the Commission deemed out-of-date. Thus, other
    than MWF’s argument that the PPA was not subject to any version of
    Schedule 38, which we addressed above, no argument regarding the
    earlier version of Schedule 38 appears in MWF’s principal brief.
    Because MWF’s argument on this issue appears for the first time in
    its reply brief, we do not consider its merits. 18
    _____________________________________________________________
    18 Still, we note that MWF’s conclusory response on reply, that
    the Commission’s approach is inconsistent with the earlier version of
    Schedule 38 and constitutes “nothing but a rehash of the arguments”
    in Ellis-Hall II, does little to illuminate the issue. Which version of
    Schedule 38 would apply to a later-executed agreement was not at
    issue in Ellis-Hall II. And broad questions pertaining to the
    Commission’s authority to approve an agreement incorporating
    (continued . . .)
    25
    MONTICELLO WIND FARM v. PSC
    Opinion of the Court
    III. MWF Raises Constitutional Challenges to the Application of
    Revised Schedule 38, None of Which Are Properly Before Us
    ¶82 MWF also raises a number of constitutional challenges to
    Revised Schedule 38. MWF claims Revised Schedule 38 “was aimed
    squarely and exclusively at [MWF]” and therefore constitutes
    “special legislation” in violation of Utah Constitution article VI,
    section 26. See UTAH CONST. art. VI, § 26 (“No private or special law
    shall be enacted where a general law can be applicable.”). MWF also
    claims Revised Schedule 38 “will sometimes,” but not always,
    “apply retroactively,” and is therefore “not uniform in its operation”
    in violation of Utah Constitution article I, section 24. See id. art. I, § 24
    (“All laws of a general nature shall have uniform operation.”).
    Finally, MWF asserts Revised Schedule 38 is unconstitutionally
    vague because it “typically” applies to projects already under
    development, leaving it within PacifiCorp’s or the Commission’s
    “unfettered discretion” whether to apply the revised schedule
    “retroactively.”
    ¶83 But as OCS and DPU point out, these constitutional
    challenges were not presented to the Commission in MWF’s petition
    for rehearing. They have made their first appearance in MWF’s
    briefing on appeal. And as a result, MWF’s constitutional challenges
    are not properly before us.
    ¶84 Utah Code section 54-7-15 provides that “[b]efore seeking
    judicial review of the commission’s action, any party . . . who is
    dissatisfied with an order of the commission shall meet the
    requirements of this section.” UTAH CODE § 54-7-15(1). Section 54-7-
    15 then provides for a process of rehearing before the Commission:
    “After any order or decision has been made by the commission, any
    party . . . may apply for rehearing of any matters determined in the
    action or proceeding.” Id. § 54-7-15(2)(a). And a party’s opportunity
    to seek judicial review is tied to its participation in the rehearing
    process: “An applicant may not urge or rely on any ground not set
    forth in the application [for rehearing] in an appeal to any court.” Id.
    § 54-7-15(2)(b).
    ¶85 We have stated that this preservation rule applies as a
    matter of statutory mandate, e.g., ABCO Enters. v. Utah State Tax
    Comm’n, 
    2009 UT 36
    , ¶ 10, 
    211 P.3d 382
    , and is a requisite step in
    “exhaust[ing] all administrative remedies” before being “allowed to
    “outdated” pricing terms were left unresolved in that opinion. See
    Ellis-Hall II, 
    2016 UT 34
    , ¶¶ 44, 47.
    26
    Cite as: 
    2019 UT 43
    Opinion of the Court
    seek judicial review of an agency decision,” In re Questar Gas Co.,
    
    2007 UT 79
    , ¶ 47, 
    175 P.3d 545
    . Accordingly, a party must raise a
    ground of error on petition for rehearing before the Commission or
    “it has waived its right to raise th[ose] arguments in this court.”
    Westside Dixon Assocs. LLC v. Utah Power & Light Co./PacifiCorp, 
    2002 UT 31
    , ¶ 23, 
    44 P.3d 775
    .
    ¶86 MWF filed a petition for rehearing before the Commission,
    and asserted that its petition was filed pursuant to section 54-7-15.
    But MWF’s petition did not raise any of these constitutional
    challenges. Accordingly, MWF has waived its right to present these
    arguments to this court. See 
    id.
    ¶87 MWF nevertheless asserts we may consider these challenges
    under the plain error and exceptional circumstances exceptions to
    our general rule of issue preservation. See Salt Lake City v. Kidd, 
    2019 UT 4
    , ¶ 31, 
    435 P.3d 248
     (noting that “[a]s a general rule, claims not
    raised before [a] trial court may not be raised on appeal” unless the
    complaining party “can demonstrate that exceptional circumstances
    exist or plain error occurred” (citations omitted) (internal quotation
    marks omitted)). OCS and DPU disagree, asserting that section 54-7-
    15 operates as a jurisdictional requisite, leaving us no room to apply
    those exceptions here. We do not resolve that question because it is
    immaterial to the outcome; MWF’s briefing falls far short of
    persuading us that either doctrine has application to the
    unpreserved challenges it raises.
    ¶88 To demonstrate plain error, an appellant must establish that
    an error exists, it should have been obvious to the trial court, and the
    error was harmful. State v. Holgate, 
    2000 UT 74
    , ¶ 13, 
    10 P.3d 346
    .
    Demonstrating error that “should have been obvious to the trial
    court” does not always require recitation of case law directly on
    point. But it does require a showing of error that was, nonetheless,
    plain. And the alleged constitutional missteps MWF claims are not
    “plain” by a long stretch.
    ¶89 In addition, we apply the exceptional circumstances
    doctrine sparingly, “to reach an unpreserved issue where a rare
    procedural anomal[y] has either prevented an appellant from
    preserving an issue or excuses a failure to do so.” State v. Johnson,
    
    2017 UT 76
    , ¶ 29, 
    416 P.3d 443
     (alteration in original) (citation
    omitted) (internal quotation marks omitted). Failure to raise an
    argument in a petition for rehearing does not constitute such a
    circumstance. Accordingly, MWF’s constitutional challenges are not
    properly before us.
    27
    MONTICELLO WIND FARM v. PSC
    Opinion of the Court
    CONCLUSION
    ¶90 MWF has failed to demonstrate that the PPA’s avoided cost
    methodology was not subject to Commission review. MWF has
    likewise failed to demonstrate that the Commission was required to
    approve the PPA unless its pricing terms would seriously harm the
    public interest. MWF did not timely raise the remainder of its
    challenges. We affirm.
    28