In the Matter of the Application of Spire Missouri, Inc., to Change Its Infrastructure System Replacement Surcharge In Its Spire Missouri East Service Territory In the Matter of the Application of Spire Missouri, Inc., to Change Its Infrastructure System Replacement Surcharge In Its Spire Missouri West Service Territory v. Missouri Public Service Commission Missouri Office of Public Counsel ( 2020 )


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  •            IN THE MISSOURI COURT OF APPEALS
    WESTERN DISTRICT
    IN THE MATTER OF THE          )
    APPLICATION OF SPIRE          )
    MISSOURI, INC., TO CHANGE     )
    ITS INFRASTRUCTURE SYSTEM     )
    REPLACEMENT SURCHARGE         )
    IN ITS SPIRE MISSOURI EAST    )
    SERVICE TERRITORY; IN THE     )
    MATTER OF THE APPLICATION     )
    OF SPIRE MISSOURI, INC., TO   )
    CHANGE ITS                    )              WD83159
    INFRASTRUCTURE SYSTEM         )              Consolidated with WD83162
    REPLACEMENT SURCHARGE         )
    IN ITS SPIRE MISSOURI WEST    )              FILED: September 1, 2020
    SERVICE TERRITORY,            )
    Appellant-Respondent,
    )
    v.                            )
    )
    MISSOURI PUBLIC SERVICE       )
    COMMISSION,                   )
    Respondent, )
    )
    MISSOURI OFFICE OF PUBLIC     )
    COUNSEL,                      )
    Respondent-Appellant. )
    Appeal from the Public Service Commission
    Before Division Four: Cynthia L. Martin, C.J., and
    Alok Ahuja and Thomas N. Chapman, JJ.
    Spire Missouri, Inc. appeals from a Report and Order issued by the Public
    Service Commission. The Report and Order addressed Spire’s applications to adjust
    the Infrastructure System Replacement Surcharge for its East and West service
    territories, to reflect costs Spire incurred between October 2017 and January 2019.
    The Commission granted Spire’s applications in large measure. It found, however,
    that it had no jurisdiction to address part of Spire’s applications because the
    applications concerned costs which were the subject of a pending appeal in this
    Court. The Commission also found that certain of Spire’s claimed costs were not
    eligible to be included in an Infrastructure Surcharge, because they related to
    Spire’s replacement of plastic piping which was not worn out or deteriorated.
    Spire appeals. The Office of Public Counsel cross-appeals, arguing that the
    Commission’s Report and Order allows Spire to include certain ineligible costs in its
    Infrastructure Surcharge. We affirm.
    Factual Background
    On January 14, 2019, Spire filed applications with the Commission in which
    it requested an increase in the Infrastructure Surcharge it was permitted to charge
    customers, to reflect the cost of pipeline replacement projects it had conducted in its
    East and West service territories.1 Spire’s applications sought to adjust its
    Infrastructure Surcharge to recover costs incurred during two separate time
    periods: October 1, 2017, through June 30, 2018; and July 1, 2018, through
    January 31, 2019.
    By statute, “[g]as corporations are permitted to recover certain infrastructure
    system replacement costs outside of a formal rate case through a surcharge on their
    customers’ bills.” In re Verified Application & Petition of Liberty Energy (Midstates)
    Corp., 
    464 S.W.3d 520
    , 522 (Mo. 2015). As explained in § I of the Discussion which
    follows, this Court has held that Spire is entitled to include in its Infrastructure
    Surcharge only the cost of replacing worn or deteriorated cast iron or bare steel
    pipes to comply with state or federal safety requirements. We held that Spire is not
    1      Spire was formerly known as Laclede Gas Company. It acquired Missouri
    Gas Energy in 2013. Spire’s East service territory comprises the area formerly served by
    Laclede Gas Company, while its West service territory was formerly operated by Missouri
    Gas Energy.
    2
    entitled to include in its Infrastructure Surcharge the cost for replacing newer
    plastic piping which is not itself worn or deteriorated, and which is not subject to a
    governmental safety mandate.
    Until approximately ten years ago, Spire replaced older cast iron or steel
    pipes in a piecemeal fashion. Beginning in approximately 2010 or 2011, Spire
    implemented a strategic program to redesign and replace its gas distribution
    facilities on a system-wide basis. Under its new strategic replacement program,
    Spire abandons existing distribution facilities on a neighborhood-wide basis, and
    bypasses and replaces the existing piping with smaller-diameter plastic pipes
    operating at a higher pressure than the old system. In re Application of Laclede
    Gas Co. to Change its Infrastructure Sys. Replacement Surcharge v. Office of Pub.
    Counsel, 
    539 S.W.3d 835
    , 837 (Mo. App. W.D. 2017) (“Spire I”) (noting the gas
    utility’s new strategy “focused on replacing entire neighborhood systems at one
    time”). The Commission found that, under its strategic replacement program, Spire
    was replacing between 60 and 65 miles of cast-iron piping in its Missouri East
    service territory per year, and approximately 120 miles of such piping in its
    Missouri West territory.
    Most of the costs Spire sought to recover in its January 2019 applications
    arose from its strategic replacement program. By retiring existing piping in place
    and replacing it on a neighborhood-wide basis, this systematic program replaces
    worn out or deteriorated cast-iron or steel pipes, and newer plastic piping, in a
    single project. Because we have held that only the cost of replacing the metal
    piping is eligible for inclusion in Spire’s Infrastructure Surcharge, its strategic
    replacement program gives rise to cost-allocation issues.
    To comply with our prior decisions holding that the cost of replacing plastic
    pipe must be excluded from the Infrastructure Surcharge, Spire supported its
    January 2019 applications with cost studies for each individual project conducted
    3
    pursuant to its strategic replacement program – 509 separate cost studies in all.
    These project-specific cost studies compared the costs of retiring and replacing the
    plastic pipe as part of a neighborhood-wide project, with the cost of reusing the
    existing plastic pipe (while replacing only the worn out or deteriorated metal pipe).
    Where one of its cost studies showed that the cost of replacing plastic piping was
    less than the cost of replacing only the metal pipe, Spire sought to recover the entire
    cost of the specific project through its Infrastructure Surcharge. Spire justified the
    recovery of the entire project cost by arguing that replacing the plastic piping added
    no incremental cost to the particular project, and actually resulted in a cost savings
    for ratepayers compared to replacing the metal pipe alone. On the other hand,
    when its cost analysis showed that it was more expensive to replace the plastic pipe
    than to reuse the existing pipe on a particular project, Spire excluded the increased
    cost from its Infrastructure Surcharge request (on the theory that the increased
    incremental cost was attributable solely to the replacement of plastic components
    which were not eligible for inclusion in the surcharge).
    The PSC’s Staff agreed with Spire’s cost-allocation approach. It argued,
    however, that the Commission lacked jurisdiction to adjust Spire’s Infrastructure
    Surcharge for costs incurred between October 1, 2017, and June 30, 2018, because
    the Commission had addressed those same costs in an earlier proceeding, and the
    Commission’s Report and Order addressing Spire’s prior surcharge-adjustment
    request was pending on appeal in this Court. See Nos. WD82302 and WD82373.
    The Office of Public Counsel (or “OPC”) objected to Spire’s applications, and
    requested an evidentiary hearing.
    The Commission held an evidentiary hearing on April 3 and 4, 2019, in which
    Spire, PSC Staff, and OPC participated. Following the hearing, the Commission
    ordered Staff to perform calculations allocating the costs of Spire’s strategic
    replacement projects based on the relative length of the cast-iron or steel pipes
    4
    replaced in a particular project, as compared to the length of plastic piping replaced
    in the project. In its final Report and Order, the Commission explained that it
    requested these percentage-based calculations because “no party had provided a
    calculation as to what that party believed was the specific cost of the replacement of
    ineligible plastic mains and service lines to be removed from Spire’s” surcharge-
    adjustment request, “even though all parties to the case had access to the work
    orders and other information necessary to identify that cost.”
    Staff filed the requested report on April 25, 2019, and a correction on April
    29. Spire filed a response on April 30, 2019. While Spire disagreed that the
    percentage-of-total-length methodology accurately represented the cost attributable
    to replacing plastic pipe, it agreed that Staff “has accurately calculated the amounts
    to be excluded from [its surcharge-adjustment] request in accordance with the
    Commission’s directive.”
    The Commission entered its final Report and Order addressing Spire’s
    January 2019 applications on August 21, 2019. Consistent with Staff’s
    recommendation, the Commission dismissed the portions of Spire’s applications
    which sought to recover costs incurred from October 2017 through June 2018. The
    Commission reasoned that it had previously addressed the surcharge-eligibility of
    “the same costs from the same time period”; because its earlier decision was then
    pending on appeal, the Commission held that it did not have jurisdiction to hear
    new evidence and make a different decision concerning those costs.
    The Report and Order then turned to the costs incurred between July 2018
    and January 2019. The Commission’s Report and Order found that “[t]here was
    little, if any, evidence that the non-cast iron or bare steel components (plastic
    components) were in a worn out or deteriorated condition. In fact, the evidence
    generally showed that the plastic pipe was not worn out or in a deteriorated
    condition.” The Report and Order found that “the plastic components, whether part
    5
    of the mains or service lines, are not being replaced because they are themselves in
    worn out or deteriorated condition, but because they are part of the systematic
    replacement of all the pipe.”
    The Report and Order rejected Spire’s cost studies. It found that Spire’s
    analyses failed to properly allocate the costs of neighborhood-wide pipe replacement
    projects between the replacement of deteriorated metal piping, and the replacement
    of plastic piping.
    Spire Missouri argues that the costs to replace the plastic
    components were less than the costs of reusing the plastic components
    and, therefore, there are no incremental costs of replacing the plastic.
    However, this argument does not align with the statutory
    requirements or the Court’s interpretation of those requirements and
    is an inappropriate comparison. [¶] The ISRS [or Infrastructure
    Surcharge] was not designed to allow early recovery of system-wide
    replacement of infrastructure, only the replacement of worn out or
    deteriorated infrastructure. Plastic components that are not otherwise
    worn out or deteriorated cannot become ISRS eligible as part of a
    systemic redesign.
    Rather than employing Spire’s cost studies, the Commission determined the
    plastic-related costs to be excluded from the Infrastructure Surcharge using the
    percentage calculations it had ordered Staff to prepare.
    Spire’s January 2019 applications also sought to include in its Infrastructure
    Surcharge certain costs it had incurred under “blanket work orders.” As explained
    in the Commission’s Report and Order, “[b]lanket work orders are work orders that
    cover a large number of tasks which remain open for an extended period and
    contain items that are not planned replacement projects.” In order to identify the
    costs incurred under blanket work orders which were eligible for inclusion in its
    Infrastructure Surcharge, Spire organized the tasks performed under the blanket
    work orders into categories, and determined whether particular categories of tasks
    were eligible for inclusion in the surcharge. The Report and Order explained that
    6
    Tasks [performed under blanket work orders] that Spire
    Missouri considered ISRS eligible were mandated relocations,
    replacements due to leak repairs and corrosion inspections, and
    replacement of copper and cast iron pipe. ISRS ineligible items
    included relocations at a customer’s request, replacements due to
    excavation damage, replacement of plastic not related to a leak repair,
    and installation of new services.
    (Footnotes omitted.) The Report and Order noted that “Staff agreed with Spire
    Missouri’s blanket work order task categorizations” and eligibility determinations,
    and that “Public Counsel also indicated several times through its attorney and
    witness at the hearing that it is not challenging the blanket work orders in this
    case.” The Report and Order adopted Spire’s recommended approach for costs
    incurred under blanket work orders.
    Spire and OPC each appealed from the Commission’s Report and Order.
    Their appeals were consolidated, and are both resolved by this opinion.
    Standard of Review
    We review the Commission’s order pursuant to § 386.510, RSMo Cum. Supp.
    2019. Appellate review under § 386.510 is “two-pronged: first, the reviewing court
    must determine whether the [Commission]’s order is lawful; and second, the court
    must determine whether the order is reasonable.” In re Mo.-Am. Water Co., 
    516 S.W.3d 823
    , 827 (Mo. 2017) (citation and internal quotation marks omitted). “The
    [Commission]’s order is presumed valid, and the appellant has the burden of
    proving that the order is unlawful or unreasonable.”
    Id. (citation omitted). Appellant
    must show the Commission’s order is unlawful or unreasonable “by clear
    and satisfactory evidence.” In re Union Elec. Co., 
    422 S.W.3d 358
    , 364 (Mo. App.
    W.D. 2013).
    “The lawfulness of an order is determined by whether the [Commission] had
    statutory authority to issue the order.” In re Rate Increase Request for Liberty Utils.
    (Mo. Water), LLC, 
    592 S.W.3d 82
    , 87 (Mo. App. W.D. 2019) (citation and internal
    quotation marks omitted). We review the lawfulness of the Commission’s order de
    7
    novo.
    Id. (citation omitted). The
    reasonableness of the Commission’s order is
    determined by whether the order is “supported by substantial, competent evidence
    on the whole record; the decision is not arbitrary or capricious; and [whether] the
    Commission has . . . abused its discretion.” Spire 
    I, 539 S.W.3d at 838
    (citation and
    internal quotation marks omitted).
    “All factual findings of the Commission are presumed correct, and if
    substantial evidence supports either of two conflicting factual conclusions, the Court
    is bound by the findings of the administrative tribunal.” State ex rel. Aquila, Inc. v.
    Pub. Serv. Comm’n, 
    326 S.W.3d 20
    , 22 (Mo. App. W.D. 2010) (citation and internal
    quotation marks omitted).
    The determination of witness credibility is left to the Commission,
    which is free to believe none, part, or all of the testimony. It is only
    where a Commission order is clearly contrary to the overwhelming
    weight of the evidence that we may set it aside. Additionally, with
    regard to issues within the Commission’s expertise, we will not
    substitute our judgment for that of the Commission.
    In re Kansas City Power & Light Co.’s Request for Auth. to Implement a Gen. Rate
    Increase for Elec. Serv. v. Mo. Pub. Serv. Comm’n, 
    509 S.W.3d 757
    , 764 (Mo. App.
    W.D. 2016) (citation and internal quotation marks omitted).
    Discussion
    We first address Spire’s challenges to the Commission’s Report and Order,
    and then address the single Point raised in Public Counsel’s cross-appeal.
    I.
    Spire’s first Point argues that the Commission’s Report and Order is
    unlawful, because it failed to permit Spire to include in its Infrastructure Surcharge
    costs which Spire contends are statutorily eligible for such treatment. Because we
    conclude that the Commission could properly determine that Spire’s cost studies did
    8
    not accurately identify its “costs for eligible infrastructure system replacements,”
    § 393.1012.1,2 we reject Spire’s first Point.
    A.
    We begin by describing the relevant statutory framework. As we discuss in
    § I.C below, the statutes governing gas utilities’ use of Infrastructure Surcharges
    have been substantially amended, with an effective date of August 28, 2020. No
    party to this appeal argues that the 2020 statutory amendments should apply here.
    We therefore apply the statutes which were in effect at the time Spire incurred the
    costs at issue, and when the Commission determined the eligibility of those costs for
    inclusion in Spire’s Infrastructure Surcharge.
    As a general proposition,
    Utility rates are established periodically by proceedings before the PSC
    known colloquially within the industry as “rate cases.” Rates are
    based on the amount of revenue necessary to build, maintain, and
    operate the utility plants and associated infrastructure (referred to as
    “rate base”), plus a reasonable rate of return for utility company
    investors. Unless otherwise provided for by law, [a regulated utility] is
    not permitted to adjust the rate it charges customers until its next rate
    case. Even if [the utility] found it necessary to build [new facilities]
    years before its next rate case, unless expressly permitted to by
    statute, it would not ordinarily be allowed to recoup its expense or earn
    profit on that capital investment in the interim. This phenomenon is
    referred to as “regulatory lag.”
    Union Elec. Co. v. Mo. Pub. Serv. Comm’n, 
    591 S.W.3d 478
    , 482 (Mo. App. W.D.
    2019) (citation omitted).
    The statutes authorizing Infrastructure Surcharges create an exception to
    this general ratemaking paradigm. Under § 393.1012.1, a gas utility is entitled to
    petition the Public Service Commission, independent of a general rate case, to
    establish an Infrastructure System Replacement Surcharge (or “ISRS”) to be
    2      Unless otherwise indicated, statutory citations refer to the 2016 edition of the
    Revised Statutes of Missouri.
    9
    charged to consumers “to provide for the recovery of costs for eligible infrastructure
    system replacements.” The utility may change the rate of the surcharge up to twice
    per year. § 393.1015.3. If the Commission determines that the utility’s application
    complies with the relevant statutes, it “shall enter an order authorizing the
    corporation to impose an ISRS that is sufficient to recover appropriate pretax
    revenue” to recover its eligible infrastructure replacement costs. § 393.1015.2(4).
    The relevant statutes provide that, in addressing a utility’s petition to
    establish or change an Infrastructure Surcharge, “[n]o other revenue requirement
    or ratemaking issues may be examined.” § 393.1015.2(2). The statutes specify that
    Commission approval of a petition, and any associated rate
    schedules, to establish or change an ISRS pursuant to the provisions of
    sections 393.1009 to 393.1015 shall in no way be binding upon the
    commission in determining the ratemaking treatment to be applied to
    eligible infrastructure system replacements during a subsequent
    general rate proceeding when the commission may undertake to review
    the prudence of such costs. In the event the commission disallows,
    during a subsequent general rate proceeding, recovery of costs
    associated with eligible infrastructure system replacements previously
    included in an ISRS, the gas corporation shall offset its ISRS in the
    future as necessary to recognize and account for any such
    overcollections.
    § 393.1015.8.
    “Eligible infrastructure system replacements” are defined as
    gas utility plant projects that:
    (a)   Do not increase revenues by directly connecting the
    infrastructure replacement to new customers;
    (b)    Are in service and used and useful;
    (c)    Were not included in the gas corporation's rate base in its
    most recent general rate case; and
    (d)   Replace or extend the useful life of an existing
    infrastructure.
    § 393.1009(3). “Gas utility plant projects” is defined in relevant part as “[m]ains,
    valves, service lines, regulator stations, vaults, and other pipeline system
    10
    components installed to comply with state or federal safety requirements as
    replacements for existing facilities that have worn out or are in
    deteriorated condition.” § 393.1009(5)(a) (emphasis added).
    B.
    This is not the first time that this Court has addressed the eligibility for
    inclusion in an Infrastructure Surcharge of costs incurred through Spire’s strategic
    replacement program. In Spire I, 
    539 S.W.3d 835
    , we addressed Spire’s effort to
    recover costs incurred between March 1 and October 31, 2016, through an
    Infrastructure Surcharge. We held that the Commission erred by permitting Spire
    to include in its surcharge the entire cost of replacing segments of its existing gas
    distribution system (including cast-iron, steel, and plastic pipes) as part of its
    strategic replacement program. We held that, under the plain language of
    § 393.1009(5)(a), costs incurred to replace plastic pipe which was not itself worn out
    or deteriorated, and which was not itself the subject of a governmental safety
    mandate, was not eligible for inclusion in an Infrastructure Surcharge. We
    emphasized that § 393.1009(5)(a) “clearly sets forth two requirements for
    component replacements to be eligible for cost recovery under ISRS: (1) the
    replaced components must be installed to comply with state or federal safety
    requirements and (2) the existing facilities being replaced must be worn out or in a
    deteriorated 
    condition.” 539 S.W.3d at 839
    .
    In Spire I, the Commission had justified Spire’s recovery of its entire
    strategic replacement program costs on the theory that the plastic components of
    the replaced system were “patches” which “constituted ‘an integral component of the
    worn out and deteriorated cast iron and steel pipe.’”
    Id. We disagreed. We
    emphasized that the Missouri Supreme Court “has found this [‘worn out or
    deteriorated’] requirement to be mandatory and has interpreted it narrowly.”
    Id. “This effort to
    assign ISRS eligibility to plastic pipes that are not worn out or
    11
    deteriorated by evaluating an entire neighborhood system as a singular unit finds
    no support in the plain language of section 393.1009(5)(a).”
    Id. (footnote omitted). We
    recognize that the replacement of worn out or deteriorated
    components will, at times, necessarily impact and require the
    replacement of nearby components that are not in a similar condition.
    Our conclusion here should not be construed to be a bar to ISRS
    eligibility for such replacement work that is truly incidental and
    specifically required to complete replacement of the worn out or
    deteriorated components. However, we do not believe that section
    393.1009(5)(a) allows ISRS eligibility to be bootstrapped to components
    that are not worn out or deteriorated simply because that are
    interspersed within the same neighborhood system of such components
    being replaced or because a gas utility is using the need to replace
    worn out or deteriorated components as an opportunity to redesign a
    system (i.e., by changing the depth of the components or system
    pressure) which necessitates the replacement of additional
    components.
    Id. at 839-40
    n.5.
    On remand from our decision in Spire I, Spire presented cost studies to the
    Commission which it had performed on ten sample work orders. According to Spire,
    those cost studies showed that, in nine of the ten projects it analyzed, the
    replacement of plastic pipe as part of a neighborhood-wide project actually
    decreased Spire’s total cost, as compared to replacing only the metal components
    and reusing the existing plastic piping. Spire therefore contended that, in the
    majority of its strategic replacement projects, it had no plastic-related costs which
    were ineligible for inclusion in its Infrastructure Surcharge. The Commission
    declined to adopt Spire’s approach. The Commission concluded that Spire had
    analyzed “far too few work orders” to permit the Commission “to extrapolate from
    those nine work orders and reach a similar result in the hundreds of work orders
    that Spire Missouri did not analyze.” In re Application of Laclede Gas Co. to
    Change its Infrastructure Sys. Replacement Surcharge, GO-2016-0332 & GO-2016-
    0333, 
    2018 WL 6724346
    , at *9 (Mo. P.S.C. Sept. 20, 2018).
    12
    The Commission’s 2018 remand order also explained that Spire’s cost studies
    were simply “irrelevant” to the question presented in an Infrastructure Surcharge
    proceeding:
    [Spire’s] argument improperly intermixes the issue of prudency, which
    is determined in a general rate proceeding, with eligibility, which is
    the appropriate determination in an ISRS proceeding. So, Spire
    Missouri’s arguments regarding prudency, cost avoidance, and
    economic efficiency are irrelevant to the Commission’s conclusion
    in these cases.
    Id. (emphasis added). Despite
    its statement that Spire’s arguments concerning relative cost were
    “irrelevant,” the Commission’s 2018 remand order contained the following dictum:
    In the future, if Spire Missouri wishes to renew its argument
    that plastic pipe replacements result in no cost or a decreased cost of
    ISRS, it should submit supporting evidence to be considered, such as,
    but not limited to, a separate cost analysis for each project claimed,
    evidence that each patch was worn out or deteriorated, or evidence
    regarding the argument that any plastic pipe replaced was incidental
    to and required to be replaced in conjunction with the replacement of
    other worn out or deteriorated components.
    
    2018 WL 6724346
    , at *10.
    Ultimately, in the remand proceeding the Commission adopted a
    methodology proposed by Staff and Public Counsel to allocate project costs between
    the surcharge-eligible replacement of worn out or deteriorated metal pipe, and the
    replacement of ineligible plastic pipe. This methodology calculated the total length
    of main and service lines replaced on a particular project, determined the
    percentage of that total length consisting of plastic pipe, and then applied that
    percentage to the total project cost.
    Id. Spire and Public
    Counsel appealed to this Court. In “Spire II,” we affirmed
    the Commission’s rejection of Spire’s incremental-cost arguments, and its reliance
    on a percentage methodology to allocate project costs between the surcharge-eligible
    and surcharge-ineligible components. In re Application of Laclede Gas Co. to
    13
    Change its Infrastructure Sys. Replacement Surcharge v. Mo. Pub. Serv. Comm’n,
    
    593 S.W.3d 582
    (Mo. App. W.D. 2019). We began our analysis by emphasizing that,
    “[a]s the party that filed the ISRS applications, Spire bore the burden of proof in
    this matter.”
    Id. at 595
    (citing § 393.150.2). Spire II found that the Commission, as
    fact-finder, was justified in rejecting Spire’s cost studies on the basis that they
    reflected too small a sample size to be persuasive; we also noted that Spire had
    presented no evidence that any of the plastic components it replaced were
    themselves worn out or deteriorated, or that their replacement was incidental and
    required to complete the replacement of worn out or deteriorated components.
    Id. at 596.
    We also found that, in the absence of any more probative evidence concerning
    the ineligible costs associated with the replacement of plastic components, the
    Commission was entitled to rely on the percentage methodology advocated by Staff
    and Public Counsel:
    We again stress that it was Spire’s burden to prove that some or
    all of its plastic replacements were eligible for ISRS recovery. Spire
    chose to rest on its theory that no ISRS collections should have been
    disallowed because its replacement of ineligible plastics did not
    increase ISRS costs. The PSC found that this theory was not
    supported by sufficient data. Spire did not conduct a case-by-case
    review to determine exactly which of its plastic replacements involved
    components that were in fact worn out or deteriorated. The PSC was
    therefore precluded from taking a more nuanced approach to the
    disallowance issue than the percentage-based method advocated by the
    OPC and Staff. We cannot conclude that the PSC erred in determining
    that the percentage model constituted “the best evidence of a
    methodology to calculate the costs of th[e] ineligible plastic pipe
    replacements.” Given the lack of evidence adduced by Spire, the
    percentage-based model was the only method the PSC could employ to
    calculate the cost of ISRS-ineligible replacements, and thereby
    calculate a disallowance in accordance with our opinion and mandate
    in Spire I. The PSC’s calculation of Spire’s ISRS disallowance was
    supported by substantial competent evidence and is not arbitrary or
    
    unreasonable. 593 S.W.3d at 597
    .
    14
    C.
    In this proceeding, Spire does not dispute that costs which are attributable to
    its replacement of plastic components are not eligible for recovery through an
    Infrastructure Surcharge, since the plastic components are not themselves worn out
    or deteriorated, and no governmental safety mandate compels their replacement.
    Instead, Spire contends that it presented evidence that, on many of the replacement
    projects it conducted, there was no incremental cost associated with the
    replacement of plastic components. Spire argues that the Commission was
    therefore statutorily required to permit Spire to include the entire cost of those
    projects in its Infrastructure Surcharge.
    On remand from our decision in Spire I, the Commission clearly stated its
    conclusion that “Spire Missouri’s arguments regarding prudency, cost avoidance,
    and economic efficiency are irrelevant to the Commission’s conclusion in” the
    expedited Infrastructure Surcharge proceedings contemplated by §§ 393.1009-
    393.1015. 
    2018 WL 6724346
    , at *9. It adhered to that decision in the Report and
    Order under review here.
    The Commission’s conclusion that Spire’s incremental-cost analyses are not
    relevant in an Infrastructure Surcharge proceeding falls within its area of expertise,
    and is entitled to deference from this Court.
    Missouri courts have long recognized that when the decision
    involves the exercise of regulatory discretion, the PSC is delegated a
    large amount of discretion, and “many of its decisions necessarily rest
    largely in the exercise of a sound judgment.” “Under these
    circumstances, the reviewing court will not substitute its judgment for
    that of the PSC on issues within the realm of the agency’s expertise.”
    State ex rel. Sprint Mo., Inc. v. Pub. Serv. Comm’n, 
    165 S.W.3d 160
    , 164 (Mo. 2005)
    (citations omitted). This deference is applicable to decisions involving the
    establishment of utility rates: “The Commission has considerable discretion in rate
    setting due to the inherent complexities involved in the rate setting process.” State
    15
    ex rel. Praxair, Inc. v. Pub. Serv. Comm’n, 
    328 S.W.3d 329
    , 339 (Mo. App. W.D.
    2010) (quoting State ex rel. Office of Pub. Counsel v. Pub. Serv. Comm’n, 
    938 S.W.2d 339
    , 344 (Mo. App. W.D. 1997)). “Missouri courts long have recognized that
    ‘ratemaking is not an exact science,’ no methodology is statutorily prescribed or
    limited, and ‘[t]he complexities inherent in a rate[-]of[-]return determination
    necessarily require that the PSC be granted considerable discretion.’” State ex rel.
    Office of Pub. Counsel v. Pub. Serv. Comm’n, 
    367 S.W.3d 91
    , 108 (Mo. App. S.D.
    2012) (citations omitted).
    In Spire II, we applied these deferential review standards to the precise issue
    we face today. We emphasized that “‘[t]his court will not substitute its judgment for
    that of the Commission,’” or “‘second-guess issues that are within the
    [Commission]’s area of expertise,’” and that we would accordingly “afford deference
    to the [Commission]’s chosen methodology for calculating an ISRS 
    disallowance.” 593 S.W.3d at 596
    (citations omitted).
    The relevant statutes did not require the Commission to rely on Spire’s
    incremental-cost analysis. The statutes specify that a utility may recover the
    “costs” of eligible infrastructure replacement projects through an Infrastructure
    Surcharge, without defining “costs,” or specifying how the eligible “costs” should be
    determined. Section 393.1012.1 provides that a gas utility may seek Commission
    approval of an Infrastructure Surcharge “that will allow for the adjustment of the
    gas corporation's rates and charges to provide for the recovery of costs for eligible
    infrastructure system replacements.” Similarly, § 393.1009(1)(a) and (c) provide
    that the “appropriate pretax revenues” to be collected through an Infrastructure
    Surcharge should provide for a rate of return on “the net original cost of eligible
    infrastructure system replacements,” and for “[r]ecover[y] [of] all other ISRS costs.”
    The relevant statutes do not otherwise define the “costs” of eligible
    infrastructure replacements – thus giving the Public Service Commission
    16
    substantial discretion to select the appropriate method for determining the “costs”
    which may be included in an Infrastructure Surcharge.
    The fact is that without any better indication of meaning than
    the unadorned term, the word “cost” in [a statute], as in accounting
    generally, is “a chameleon,” a “virtually meaningless” term. . . .
    [W]ords like “cost” “give ratesetting commissions broad methodological
    leeway; they say little about the ‘method employed’ to determine a
    particular rate.”
    Verizon Commc’ns, Inc. v. FCC, 
    535 U.S. 467
    , 500-01 (2002) (citations omitted). In
    Verizon, the Supreme Court of the United States held that use of the term “cost” in
    a statute governing telecommunications rates was “simply too protean” to require
    that a rate-setting agency consider historical investments in setting rates.
    Id. at 501.
    The Supreme Court has also recognized that issues of cost-allocation – like
    the issue presented here – are discretionary determinations frequently delegated to
    expert administrative agencies like the PSC. In National Association of Greeting
    Card Publishers v. U.S. Postal Service, 
    462 U.S. 810
    (1983), a statute specified that
    the Postal Rate Commission should set rates for different classes of mail based on
    “the requirement that each class of mail or type of mail service bear the direct and
    indirect postal costs attributable to that class or type plus that portion of all other
    costs of the Postal Service reasonably assignable to such class or type.”
    Id. at 814
    n.3 (quoting relevant statute). The Supreme Court held that this statute did not
    mandate that the Rate Commission use any particular methodology to determine
    which costs were “attributable” to particular classes of mail, but that the Rate
    Commission instead had substantial discretion to choose how to allocate costs to
    different mail categories.
    The Court has observed that “[a]llocation of costs is not a matter
    for the slide-rule. It involves judgment on a myriad of facts. It has no
    claim to an exact science.” Generally, the legislature leaves to the
    ratesetting agency the choice of methods by which to perform this
    17
    allocation, although if the statute provides a formula, the agency is
    bound to follow it.
    We agree with the Rate Commission's consistent position that
    Congress did not dictate a specific method for identifying causal
    relationships between costs and classes of mail, but that the Act
    “envisions consideration of all appropriate costing approaches.” The
    Rate Commission has held that, regardless of method, the Act requires
    the establishment of a sufficient causal nexus before costs may be
    attributed. . . .
    ....
    [The relevant statute] requires that all “attributable costs” be
    borne by the responsible class. In determining what costs are
    “attributable,” the Rate Commission is directed to look to all costs of
    the Postal Service, both “direct” and “indirect.” In selecting the phrase
    “attributable costs,” Congress avoided the use of any term of art in law
    or accounting. In the normal sense of the word, an “attributable” cost
    is a cost that may be considered to result from providing a particular
    class of service. On its face, there is no reason to suppose that [the
    statute] denies to the expert ratesetting agency, exercising its
    reasonable judgment, the authority to decide which methods
    sufficiently identify the requisite causal connection between particular
    services and particular 
    costs. 462 U.S. at 825-27
    (citations and footnotes omitted).
    As the Supreme Court recognized, the word “cost” is a “chameleon,” which
    can have multiple different meanings. On the one hand, several usages of the term
    “cost” focus – like Spire’s cost studies – only on the additional increment of expense
    associated with adding an additional service or unit of production onto an existing
    activity. Terms like “incremental cost,” “marginal cost,” “differential cost,” or
    “avoided cost” may seek to capture “cost” in this sense. On the other hand, other
    well-established usages of the term “cost” determine the “cost” of a particular
    activity by allocating to that activity a share of the total costs of the endeavor of
    which the specific activity is a part (both fixed or sunk costs, and variable costs).
    “Cost” in this sense may be reflected in terms like “total cost,” “average cost,” “full
    cost,” or “absorbed/absorption cost.”
    18
    In its 2018 remand order, and again in this case, the Public Service
    Commission has held that to determine the “costs” of plastic-pipe replacement
    which must be excluded from Spire’s Infrastructure Surcharge, it is appropriate to
    allocate a share of the total costs of the neighborhood-wide replacement project in
    which the plastic-pipe replacement occurs. This is a well-established construction of
    the term “costs.” The use of the term “costs” in the relevant statutes, without
    further definition or explanation, did not prevent the Commission from adopting
    this approach.3
    Several considerations support the Commission’s interpretation of the “costs”
    eligible for inclusion in an Infrastructure Surcharge. First, because the
    Infrastructure Surcharge mechanism is an exception to Missouri’s general
    prohibition on “single-issue ratemaking,” we held in Spire I that the statutory
    eligibility criteria are mandatory, and must be narrowly 
    construed. 539 S.W.3d at 838
    , 839. This consideration justifies the Commission in rejecting Spire’s
    incremental-cost analysis, since under Spire’s analysis, it would be able to include
    in an Infrastructure Surcharge all of the costs of a project, even though that project
    included substantial replacement of ineligible plastic piping.
    In Spire I, Spire argued that it was not appropriate to focus on whether
    particular plastic components were “worn out or deteriorated.” Instead, it argued
    “that the specific condition of the replaced plastic components is not dispositive and
    3       Spire cites to the legislature’s reference to “avoided costs” in § 393.1075.2(6),
    to argue that the Commission should have applied the same concept here. But
    § 393.1075.2(6) explicitly refers to “avoided costs,” while the Infrastructure Surcharge
    statutes do not. See McAlister v. Strohmeyer, 
    395 S.W.3d 546
    , 552 (Mo. App. W.D. 2013)
    (“’It is a settled canon of statutory construction that, where different language is used in the
    same connection in different parts of an act, it is presumed that the legislative body
    intended different meaning and effect.’” (citation omitted)). Spire also cites to the
    Commission’s regulations governing utility resource planning, 20 CSR 4240-22.010 to -
    22.080, which rely on avoided-cost principles. But the fact that avoided-cost concepts may
    be well-suited to forward-looking managerial decisionmaking does not mean that the
    Commission was required to use those same principles in this very different rate-setting
    context.
    19
    that ISRS-eligibility should be determined based on the condition of the entire
    neighborhood 
    system.” 539 S.W.3d at 839
    . We disagreed, finding that Spire’s
    “effort to assign ISRS eligibility to plastic pipes that are not worn out or
    deteriorated by evaluating an entire neighborhood system as a singular unit finds
    no support in the plain language of section 393.1009(5)(a).”
    Id. Spire’s incremental- cost
    analyses essentially engage in the same “bootstrapping” as the arguments we
    rejected in Spire I. Spire’s cost analyses focus on the aggregate cost of replacing “an
    entire neighborhood system as a singular unit,” rather than seeking to identify and
    isolate the cost of replacement of the plastic components themselves. As explained
    in the Public Service Commission’s Brief, Spire’s incremental-cost analysis
    “proceeds from an assumption that the entire cost to replace whole neighborhoods
    can be attributed to the replacement of cast iron and steel” – even though
    substantial quantities of ineligible plastic piping was replaced as part of the same
    project. Spire seeks to resurrect an argument we rejected in Spire I.4
    One of Spire’s own witnesses acknowledged that some “cost” is “inherent” in
    the replacement of plastic piping, even in projects where there was no incremental
    cost to replacing the plastic piping at the same time as metal piping.
    Q.    Okay. And let me look here. And are you in agreement
    with what Mr. Pendergast said earlier, that basically the – the ISRS
    costs that the Company is trying to recover don’t include a cost for the
    plastic because it would have cost more if you had not replaced it – the
    plastic?
    4       In Spire I, the Commission had concluded that it was unnecessary to allocate
    any cost to the replacement of plastic pipes as part of Spire’s strategic replacement
    program, on the theory that the plastic piping constituted “an integral component” of a
    neighborhood-wide distribution network which also included worn out or deteriorated metal
    
    pipe. 539 S.W.3d at 839
    . We held that, under § 393.1009(5)(a), it was inappropriate to
    “evaluat[e] an entire neighborhood system as a singular unit”; instead, the statute required
    that the particular components being replaced satisfy the statutory eligibility criteria.
    Id. at 839-40
    & n.5. Spire I did not involve the Commission’s selection of a cost-allocation
    methodology, but instead its refusal to conduct any cost-allocation whatsoever, based on an
    erroneous interpretation of the governing law.
    20
    A.      Well, there is a cost inherent to – you know, to replacing
    all the pipe that’s involved in that. So there’s a cost involved with
    the plastic. But what we’re saying is that it is, in most cases, cheaper
    to replace it then what it would have cost us to re-use that plastic so
    there’s an avoided cost. Not that there’s no cost, but it’s – it’s a less
    cost than it would be to re-use it.
    (Emphasis added.)
    While Spire’s incremental-cost analysis may be relevant in a later rate case,
    the Commission could rightfully determine that it was not the appropriate analysis
    in the current proceeding. As the Commission recognized in its 2018 remand order,
    consideration of incremental or marginal costs may be relevant in determining
    whether Spire acted prudently in replacing plastic piping (which was not itself worn
    out or deteriorated, and had remaining useful life) at the same time that it replaced
    the worn out or deteriorated metal pipe. But such prudence issues are not
    implicated in this Infrastructure Surcharge proceeding: the relevant statutes
    specify that “[n]o other . . . ratemaking issues may be examined,” in a proceeding to
    approve a change to an Infrastructure Surcharge, § 393.1015.2(2), and that the
    approval of an Infrastructure Surcharge “shall in no way be binding upon the
    commission . . . during a subsequent general rate proceeding when the commission
    may undertake to review the prudence of such costs.” § 393.1015.8.
    Finally, we note that in its most recent session, the General Assembly
    enacted amendments to the Infrastructure Surcharge statutes which adopt the
    result for which Spire is advocating. House Bill 2120, 100th General Assembly, 1st
    Regular Session (2020), amends the definition of “gas utility plant projects” in
    § 393.1009(5), to include
    any cast iron or steel facilities including any connected or associated
    facilities that, regardless of their material, age, or condition, are
    replaced as part of a qualifying replacement project in a manner that
    adds no incremental cost to a project compared to tying into or reusing
    existing facilities.
    21
    Under this amendment, which became effective on August 28, 2020, the cost of
    replacing “connected or associated facilities” may be recoverable under an
    Infrastructure Surcharge, without regard to whether the replaced piping is itself
    worn out or deteriorated.
    [I]n enacting a new statute on the same subject as that of an existing
    statute, it is ordinarily the intent of the legislature to effect some
    change in the existing law. “If this were not so the legislature would
    be accomplishing nothing, and legislatures are not presumed to have
    intended a useless act.”
    State ex rel. Edu-Dyne Sys., Inc. v. Trout, 
    781 S.W.2d 84
    , 86 (Mo. 1989) (citing and
    quoting Kilbane v. Dir. of Dep’t of Revenue, 
    544 S.W.2d 9
    , 11 (Mo. 1976)); see also,
    e.g., State ex rel. Office of Pub. Counsel v. Mo. Pub. Serv. Comm’n, 
    331 S.W.3d 677
    ,
    690 (Mo. App. W.D. 2011). We recognize that a later statutory enactment may not
    always be a reliable guide to the interpretation of the pre-amendment statute.5
    Nevertheless, the General Assembly’s amendment to the definition of “gas utility
    plant projects” provides some additional support for our conclusion that, prior to
    this amendment, the Commission was not required to accept Spire’s incremental-
    cost analysis.
    Point I is denied.
    II.
    Spire’s second and third Points argue that the Commission’s rejection of its
    incremental-cost studies, and its decision to instead use the percentage methodology
    5       Although the Supreme Court’s decision in Edu-Dyne System states that the
    purpose of a statutory amendment is “ordinarily” to change existing law, other cases
    recognize that, “‘[w]hile an amendment to a statute must be deemed to have been intended
    to accomplish some purpose, that purpose can be clarification rather than a change in
    existing law.’” State ex rel. Outcom, Inc. v. City of Peculiar, 
    350 S.W.3d 57
    , 65 (Mo. App.
    W.D. 2011) (quoting Andresen v. Bd. of Regents of Mo. W. Coll., 
    58 S.W.3d 581
    , 589 (Mo.
    App. W.D. 2001)); accord, Self v. Midwest Orthopedics Foot & Ankle, P.C., 
    272 S.W.3d 364
    ,
    370 (Mo. App. W.D. 2008).
    22
    to identify surcharge-ineligible costs, was not supported by competent and
    substantial evidence, and was arbitrary, capricious, or unreasonable.
    In large measure, Spire’s second and third Points repeat many of the
    arguments which we have addressed in § I, above. Spire also argues in both Points
    that the Commission’s decision should be reversed because, in preparing and
    submitting its 509 cost studies, Spire “kept faith with the explicit guidance given by
    the PSC” in the 2018 remand order, and followed the “evidentiary roadmap”
    specified by the Commission. Spire goes so far as to claim that “[t]he 2018 Order
    identified no flaws in Spire’s cost analyses; to the contrary, rather than criticizing
    these studies, the PSC wanted more of them, i.e., one for each project.” Spire
    argues that the Commission “pulled the rug out from under” Spire after it dutifully
    followed the Commission’s directions, and that the Report and Order constitutes “a
    complete repudiation of the guidance [the Commission] had given the parties in the
    2018 order.”
    This argument rests on a highly selective reading of the Commission’s 2018
    remand order. As we described above, the Commission’s order on remand from our
    Spire I decision explicitly stated that the focus on incremental costs in Spire’s cost
    studies was “irrelevant” to the cost-allocation issues involved in an Infrastructure
    Surcharge proceeding:
    [Spire’s] argument improperly intermixes the issue of prudency, which
    is determined in a general rate proceeding, with eligibility, which is
    the appropriate determination in an ISRS proceeding. So, Spire
    Missouri’s arguments regarding prudency, cost avoidance, and
    economic efficiency are irrelevant to the Commission’s conclusion
    in these cases.
    
    2018 WL 6724346
    , at *9 (emphasis added). As we recognized in Spire II, in its 2018
    remand order the Commission found “that Spire had not even attempted to quantify
    its ISRS costs attributable to the replacement of plastic components that were not
    worn out or deteriorated, despite our previous holding that those costs were not
    23
    
    ISRS-eligible.” 593 S.W.3d at 596
    . While the remand order may also have offered
    suggestions to Spire as to how it might make its cost studies more persuasive in a
    future proceeding, Spire cannot plausibly argue that the Commission explicitly
    endorsed its incremental-cost approach. We see no inconsistency – much less an
    inconsistency that would warrant reversal – between the Commission’s 2018
    remand order, and the Report and Order now under review.
    Spire also argues at some length that the Commission acted without
    substantial supporting evidence, and in an arbitrary and capricious manner, when
    it determined the plastic-related costs which it would exclude from Spire’s
    Infrastructure Surcharge using the percentage method. We have explained above
    that the Commission acted within its authority in rejecting Spire’s incremental-
    cost-based analysis. Having rejected Spire’s cost studies, the Commission found
    itself in precisely the same position as in Spire II. As in Spire II, the percentage
    methodology offered the only reasonably available method to determine the share of
    the costs of Spire’s strategic replacement projects to allocate to the replacement of
    plastic piping.
    As we explained in Spire II, “it was Spire’s burden to prove that some or all of
    its plastic replacements were eligible for ISRS 
    recovery.” 593 S.W.3d at 597
    .
    Because of Spire’s reliance on an incremental-cost analysis which the Commission
    properly rejected,
    [t]he PSC was therefore precluded from taking a more nuanced
    approach to the disallowance issue than the percentage-based method
    advocated by the OPC and Staff. We cannot conclude that the PSC
    erred in determining that the percentage model constituted “the best
    evidence of a methodology to calculate the costs of th[e] ineligible
    plastic pipe replacements.” Given the lack of [competent] evidence
    adduced by Spire, the percentage-based model was the only method the
    PSC could employ to calculate the cost of ISRS-ineligible replacements,
    and thereby calculate a disallowance in accordance with our opinion
    and mandate in Spire I. The PSC’s calculation of Spire’s ISRS
    24
    disallowance was supported by substantial competent evidence and is
    not arbitrary or 
    unreasonable. 593 S.W.3d at 597
    .6
    III.
    Finally, Spire’s fourth Point argues that the Commission erroneously
    concluded that it had no jurisdiction over Spire’s request to recover additional costs
    for the October 2017 to June 2018 period which were not previously recovered in an
    earlier Infrastructure Surcharge case.
    In Spire’s January 2019 applications, it requested to recover costs through its
    Infrastructure Surcharge which it had incurred in two different time periods:
    (1) October 1, 2017, through June 30, 2018; and (2) July 1, 2018, through January
    31, 2019. Spire had previously requested to recover the costs from the October 2017
    through June 2018 time period in an earlier Infrastructure Surcharge proceeding.
    In that earlier proceeding the Commission followed the approach from the 2018
    remand order, and rejected Spire’s incremental cost analyses; instead, the
    Commission excluded certain of Spire’s claimed costs using the percentage-based
    analysis which we upheld in Spire II. In re Application of Spire Mo. Inc. to Change
    its Infrastructure Sys. Replacement Surcharge in its Spire Mo. E. Serv. Territory,
    Nos. GO-2018-0309 & -0310, 
    2018 WL 6724358
    , at *12 (Mo. P.S.C. Sept. 20, 2018).
    The Commission’s decision in the earlier proceeding was pending on appeal at the
    time of Spire’s January 2019 applications, see Nos. WD82303 and WD82373, and
    ultimately resulted in our decision in Matter of Application of Spire Missouri Inc. to
    Change its Infrastructure System Replacement Surcharge in its Spire Missouri East
    6      At various points in its briefing, Spire complains that a percentage-based cost
    allocation was only performed by Staff after the evidentiary hearings in this case, and in
    response to the Commission’s request. While this may have been an unusual procedure,
    Spire was given an opportunity to respond to the percentage-based cost analysis prepared
    by Staff, and told the Commission that it had no objection to the accuracy of Staff’s
    implementation of the percentage-based approach. Spire makes no argument that the
    Commission was somehow legally precluded from proceeding in the fashion it did, or that
    the procedures employed by the Commission could themselves somehow justify reversal.
    25
    Service Territory v. Office of Public Counsel, 
    593 S.W.3d 546
    (Mo. App. W.D. Nov.
    19, 2019).
    Spire’s January 2019 applications again sought to recover costs it had
    incurred between October 2017 and June 2018, “to the extent such costs were not
    recovered in the Company’s immediately preceding ISRS proceedings . . . because of
    what the Commission deemed to be insufficient evidence demonstrating their
    eligibility.” Spire asserted in its applications that it “has now corrected this
    deficiency using the roadmap for demonstrating eligibility provided by the
    Commission in” the 2018 remand order, and repeated in its later order addressing
    the 2017-18 costs. In its briefing to this Court, Spire asserts that, in the current
    proceeding, it submitted to the Commission incremental-cost studies for each of “the
    projects that had been subjected to the percentage method in the 2018 Case.”
    In its Report and Order, the Commission dismissed the portions of Spire’s
    January 2019 applications concerning costs incurred between October 2017 and
    June 2018. The Commission found that it lacked jurisdiction to reconsider the
    surcharge-eligibility of these costs, while its earlier decision addressing those same
    costs was pending on appeal to this Court.
    Spire argues that the Commission erred as a matter of law in concluding that
    it had no jurisdiction to consider Spire’s new evidence concerning the costs it had
    incurred between October 2017 and June 2018. It is unnecessary for us to address
    this jurisdictional issue, however. Even if the Commission had jurisdiction to
    consider new evidence concerning the October 2017 to June 2018 costs, we have
    held in § I above that the Commission properly rejected Spire’s incremental-cost-
    based analyses, and instead determined the amount of ineligible plastic-related
    costs using a percentage-of-total-length methodology. Even if the Commission had
    concluded that it had jurisdiction to reconsider its treatment of the October 2017 to
    June 2018 costs, it had already applied the percentage-based methodology to those
    26
    costs. Spire has shown no basis to justify a different treatment of the October 2017
    to June 2018 costs, even if the Commission had jurisdiction to reconsider the issue.7
    Point IV is denied.
    IV.
    Finally, we turn to the single Point raised by the Office of Public Counsel in
    its cross-appeal. Public Counsel argues that the Commission erroneously allowed
    Spire to include in its Infrastructure Surcharge costs which it incurred under
    blanket work orders, but which were related to plastic components which were not
    worn out or deteriorated.
    Blanket work orders are general work orders covering a large variety of tasks
    which are not planned replacement projects. (Thus, blanket work orders do not
    govern the neighborhood-wide projects performed under Spire’s systematic
    replacement program.) Spire’s January 2019 applications divided the tasks
    performed under blanket work orders into categories, and asserted that the cost of
    tasks in certain categories were eligible for recovery through its Infrastructure
    Surcharge. The surcharge-eligible tasks included: mandated relocations of gas
    distribution infrastructure; replacements as a result of leak repairs and corrosion
    7      Spire argues in its Brief that, even if we find that the Commission properly
    applied a percentage-based methodology to costs incurred as part of Spire’s strategic
    replacement program, a live issue still remains concerning the costs Spire incurred between
    October 2017 and June 2018: the treatment of costs Spire incurred under blanket work
    orders (a subject we discuss in greater detail in § IV, below). Spire argues that, in its prior
    order, the Commission applied a percentage-based allocation methodology to costs incurred
    under blanket work orders, but that Spire now seeks to have the Commission apply a task-
    based allocation method to those costs. As noted in the text, however, Spire’s January 2019
    applications sought to apply “the roadmap for demonstrating eligibility” first described by
    the Commission in the 2018 remand order, to the costs Spire had incurred between October
    2017 and June 2018. That “roadmap” did not involve a task-based allocation of costs
    incurred under blanket work orders. See 2018 remand order, 
    2018 WL 6724346
    , at *5 ¶ 19
    (noting that Staff applied percentage-of-total-length methodology to costs incurred under
    blanket work orders); see also 
    2018 WL 6724358
    , at *6 ¶ 22 (noting that Staff applied the
    same analysis to costs incurred between October 2017 and June 2018). We do not read
    Spire’s January 2019 applications as seeking to apply a task-based allocation methodology
    to costs incurred under blanket work orders between October 2017 and June 2018.
    27
    inspections; and the replacement of copper and cast-iron pipe. Tasks which Spire
    acknowledged were not surcharge-eligible included: relocations at a customer’s
    request; replacements following excavation damage; replacement of plastic
    components not related to leak repair; and installation of new service.
    The PSC’s Staff agreed with Spire’s task-based approach, and with its
    categorization of tasks as surcharge-eligible and -ineligible. To calculate the
    blanket work order costs to be included in Spire’s Infrastructure Surcharge, Staff
    included 100% of the cost for surcharge-eligible tasks, and none of the costs of
    ineligible tasks. Staff did so by calculating the percentage of ineligible tasks
    performed under Spire’s blanket work orders, and then applying that percentage to
    the total blanket work order costs.
    In its Report and Order, the Commission noted that the Office of Public
    Counsel “indicated several times . . . that it is not challenging the blanket work
    orders in this case,” and that Public Counsel stated in its brief and in a recent filing
    “that it was choosing not to pursue this issue.” Thus, the Commission concluded
    “[t]here is agreement that the gas utility plant contained in Spire Missouri’s blanket
    work orders and its work orders for relocations may be considered ISRS eligible for
    purposes of this case.”
    In its cross-appeal, Public Counsel argues that the Commission’s Report and
    Order improperly permits recovery for surcharge-ineligible costs incurred under
    Spire’s blanket work orders. Although not entirely clear, it appears that Public
    Counsel challenges the use of a percentage-based methodology based on the number
    of ineligible tasks performed under a blanket work order, rather than based on the
    relative magnitude of the eligible and ineligible tasks (i.e., the amount of eligible
    and ineligible piping replaced under the blanket work orders).8 To support this
    8      As discussed in footnote 7, above, in prior proceedings the Commission
    applied a percentage-of-total-length methodology to allocate the costs of tasks performed
    28
    argument, Public Counsel argues that the Commission erroneously permitted Spire
    to recover the cost of “service[-line] renewals” in its Infrastructure Surcharge.
    Specifically, it argues that it has identified ineligible service-line renewals within
    the blanket work order costs which the Commission permitted Spire to recover.
    We see several flaws in Public Counsel’s argument. First, although not
    argued by Spire or by the Commission itself, we note that the Report and Order
    states, on multiple occasions, that Public Counsel was “not challenging the blanket
    work orders in this case.” Although no other party argues that Public Counsel
    failed to preserve this issue, we seriously question whether it has standing to
    challenge the Commission’s treatment of costs incurred under blanket work orders,
    when it apparently chose not to challenge that issue before the Commission itself.
    Even if the issue were preserved, however, Public Counsel has failed to
    satisfy its burden to establish error. In the Report and Order, the Commission
    states that “[a] ‘service renewal occurs when an existing service line is replaced in
    its entirety with a new service line.’ Service renewals could be done at either the
    request of the customer or in the course of a leak repair.” (Emphasis added;
    footnotes omitted.) Thus, according to the Report and Order, service-line renewals
    can be performed either at a customer’s request, or in repairing a leak. The Report
    and Order also states that Spire and Staff indicated that the only blanket work
    order costs for replacing plastic pipes which were included in Spire’s Infrastructure
    Surcharge were the costs for “replacements due to leak repairs”; the Report and
    under blanket work orders. But the Commission’s orders in the prior cases indicate that
    documentation was not available to determine the relative length of plastic and metal pipe
    actually replaced under the blanket work orders themselves. See 2018 remand order, 
    2018 WL 6724346
    , at *5 ¶ 19; 
    2018 WL 6724346
    , at *5 ¶ 18, *6 ¶ 22. Instead, Staff took the
    relative percentages that it developed in reviewing the work performed as part of Spire’s
    strategic replacement program, and simply applied the same percentages to the blanket
    work order costs.
    Id. Public Counsel’s briefing
    does not make clear whether (unlike in the
    prior cases) adequate documentation existed in this case to actually calculate the relative
    lengths of plastic and metal pipe replaced under Spire’s blanket work orders.
    29
    Order specifically states that “replacement of plastic not related to leak repair” was
    treated as an ineligible task, and that its cost was excluded from the surcharge.
    Public Counsel’s Brief proceeds on the assumption that the costs of all
    service-line renewals are ineligible for inclusion in an Infrastructure Surcharge. Its
    Brief fails to address the Report and Order’s findings that service-line renewals can
    be occasioned by both eligible and ineligible circumstances, and that only the costs
    for plastic-pipe replacement related to leak repairs were included in Spire’s
    Infrastructure Surcharge. Notably, Public Counsel concedes in its Brief that it does
    “not challeng[e] the ISRS eligibility of” costs incurred under blanket work orders for
    “such things as leak repairs” – yet these appear to be the only plastic-related
    blanket work order costs which were included in Spire’s surcharge.
    In light of Public Counsel’s failure to challenge the Commission’s findings
    that it excluded the cost of ineligible plastic-pipe replacement under blanket work
    orders from the Infrastructure Surcharge, we reject Public Counsel’s cross-appeal
    Point without further discussion.9
    Conclusion
    The Commission’s Report and Order is affirmed.
    _______________________________________
    Alok Ahuja, Judge
    All concur.
    9      Spire filed a motion to strike portions of Public Counsel’s brief. That motion
    is denied.
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