State ex rel. Utils. Comm'n v. Virginia Elec. ( 2022 )


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  •                      IN THE SUPREME COURT OF NORTH CAROLINA
    2022-NCSC-75
    No. 477A20
    Filed 17 June 2022
    STATE OF NORTH CAROLINA ex rel. UTILITIES COMMISSION, ATTORNEY
    GENERAL JOSHUA H. STEIN, PUBLIC STAFF – NORTH CAROLINA
    UTILITIES COMMISSION
    v.
    VIRGINIA ELECTRIC AND POWER COMPANY d/b/a DOMINION ENERGY
    NORTH CAROLINA
    Appeal as of right pursuant to N.C.G.S. § 62-90 and N.C.G.S. § 7A-29(b) from
    a final order of the North Carolina Utilities Commission entered on 24 February 2020
    in Docket No. E-22, Sub 562 and 566. Heard in the Supreme Court on 5 January
    2022.
    Public Staff – North Carolina Utilities Commission, by Chief Counsel Diane W.
    Downey and Staff Attorneys Lucy E. Edmondson, Nadia L. Luhr, Robert B.
    Josey, and Munashe Magarira, for North Carolina Utilities Commission, and
    Joshua H. Stein, Attorney General, by Margaret A. Force, Special Deputy
    Attorney General, appellees.
    McGuire Woods, LLP, by Mary Lynne Grigg, Mark E. Anderson, W. Dixon
    Snukals, Nicholas A. Dantonio, and Bradley R. Kutrow, for Virginia Electric
    and Power Company d/b/a Dominion Energy North Carolina, appellant.
    ERVIN, Justice.
    ¶1           This appeal arises from an order entered by the Commission addressing an
    application for a general increase in its North Carolina retail rates filed by Virginia
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    Opinion of the Court
    Electric and Power Company d/b/a Dominion Energy North Carolina. In its order,
    the Commission authorized Dominion to calculate its North Carolina retail electric
    rates by, among other things, amortizing certain costs associated with the storage,
    disposal, and removal of coal ash waste to rates over a ten-year period while rejecting
    Dominion’s request to be permitted to earn a return on the unamortized balance of
    those costs.   In seeking relief from the Commission’s order before this Court,
    Dominion argues that the Commission acted arbitrarily and capriciously by failing to
    utilize the same amortization period that had been employed in two earlier decisions
    involving Dominion and Duke Energy Corporation addressing the ratemaking
    implications of coal ash-related costs and by failing to allow Dominion to earn a return
    on the unamortized balance of those costs as had been permitted in the earlier
    decisions. More specifically, Dominion argues that the Commission erred by “fail[ing]
    to set forth any facts to support its break with its own precedent,” that “[a]ny
    differences that exist between [Dominion] and Duke Energy warrant more favorable
    ratemaking treatment for” Dominion in this case, and that the Commission’s failure
    to follow the precedent that had been established in its earlier coal ash-related
    decisions violated the equal protection provisions of the United States and North
    Carolina Constitutions. After careful consideration of Dominion’s challenges to the
    Commission’s order in light of the record and the applicable law, we affirm the
    Commission’s order.
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    I.    Factual Background
    A. Substantive Facts
    ¶2          The application that Dominion filed with the Commission in this case sought
    an increase in the company’s North Carolina retail rates and charges, with the costs
    upon which Dominion’s application was predicated having included substantial
    amounts that Dominion had incurred in order to remediate conditions at the
    company’s coal ash storage facilities between 1 July 2016 and 30 June 2019,1 which
    included the costs of complying with both federal and state regulatory requirements
    that mandated the closure of existing coal ash basins and other storage areas. Among
    other regulations, certain Dominion facilities are subject to the “Hazardous and Solid
    Waste Management System—Disposal of Coal Combustion Residuals from Electric
    Utilities” rule, 
    80 Fed. Reg. 21301
    , or “CCR Rule,” which was promulgated by the
    Environmental Protection Agency on 17 April 2015. According to the CCR rule,
    affected utilities are required to retrofit or close all of their existing coal ash ponds
    and to perform groundwater monitoring, engage in various sorts of corrective action,
    and take other steps, as necessary, to prevent the harmful substances found in coal
    combustion residuals from percolating into nearby groundwater. Eight of Dominion’s
    1Coal ash, or coal combustion residuals (CCR), is the by-product generated when coal
    is burned for the purpose of generating electricity. Historically, coal combustion residuals
    have been stored either in wet pond impoundments or in dry landfills.
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    coal-fired generating facilities and related coal ash storage facilities are subject to the
    CCR rule.
    ¶3         Another coal ash-related regulatory requirement that affects Dominion’s
    operations is Virginia Senate Bill 1355, which was adopted in 2019 and requires
    Dominion to remove coal combustion residuals from the storage ponds used at four of
    Dominion’s coal-fired electric generating facilities and to place them into lined,
    permitted landfills, with the excavated coal ash waste to be permanently housed
    either in fully-lined onsite landfills that have been constructed consistently with
    modern standards or in offsite landfills and with Dominion being required to recycle
    approximately 25% of excavated coal ash waste in the event that it is economically
    feasible to do so. In order to satisfy the requirements of the CCR Rule and other
    applicable state and federal laws, Dominion developed closure plans for each of the
    ponds and landfills to which these regulations applied.          As a result, Dominion
    incurred a North Carolina retail amount of $21.8 million for the purpose of managing
    its coal ash waste during the three year period from 1 July 2016 until 30 June 2019,
    including “(1) $19.2 million in expenditures made . . . to comply with federal and state
    environmental regulations associated with managing CCRs and converting or closing
    waste ash management facilities at seven of [Dominion]’s generation stations; and (2)
    $2.7 million in financing costs.”
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    B. Prior Commission Decisions Relating to Coal Ash Remediation
    ¶4         On 31 March 2016, Dominion applied to the Commission for a general rate
    increase for the purpose, in part, of reflecting coal ash-related costs that it had
    incurred through 30 June 2016 in its North Carolina retail rates and charges.
    Application of Va. Elec. & Power Co., d/b/a Dominion N.C. Power, for Adjustment of
    Rates and Charges Applicable to Elec. Util. Serv. in N.C., Docket No. E-22, Sub 532,
    2016 N.C. PUC LEXIS 1183, at *4-5 (N.C.U.C. Dec. 22, 2016). Subsequent to the
    filing of Dominion’s application, the Public Staff and Dominion entered into a
    stipulation that provided, with respect to Dominion’s coal ash-related costs, that:
    (1)   Amortization periods — CCR expenditures incurred
    through June 30, 2016, should be amortized over a five-
    year period.    Notwithstanding this agreement, the
    Stipulating Parties further agree that the appropriate
    amortization period for future CCR expenditures shall be
    determined on a case-by-case basis.
    (2)    Deferral of future CCR expenditures — By virtue of
    the Commission's approval in this proceeding of a
    mechanism to provide for recovery of CCR expenditures
    incurred through June 30, 2016, the Company has
    authority pursuant to the August 6, 2004, Order in Docket
    No. E-22, Sub 420, to defer additional CCR expenditures,
    without prejudice to the right of any party to take issue
    with the amount or the treatment of any deferral of ARO
    costs in a rate case or other appropriate proceeding.
    (3)    Continuing amortization and deferral of CCR
    expenditures — The Company and the Public Staff reserve
    their rights in the Company's next general rate case to
    argue to the Commission (a) how the unamortized balance
    of deferred CCR expenditures incurred by the Company
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    Opinion of the Court
    prior to June 30, 2016, and the related amortization
    expense should be addressed; and (b) how reasonable and
    prudent CCR expenditures incurred by the Company after
    June 30, 2016, should be recovered in rates.
    (4)   Overall prudence of CCR Plan — The Public Staff's
    agreement in this proceeding to the deferral and
    amortization of CCR expenditures incurred through June
    30, 2016, shall not be construed as a recommendation that
    the Commission reach any conclusions regarding the
    prudence and reasonableness of the Company's overall
    CCR plan, or regarding any specific expenditures other
    than the ones to be recovered in this case.
    Id. at *137-39. After the conclusion of an evidentiary hearing, the Commission
    approved the portion of the parties’ stipulation relating to coal ash-related costs,
    determining that Dominion was
    allowed to defer the costs of its remediation of coal
    combustion residuals through June 30, 2016, and shall be
    allowed to amortize those deferred costs over a period of
    five years. The Company submitted substantial evidence
    that its costs incurred to comply with federal and state law
    regarding disposal of CCRs were prudently and reasonably
    incurred. . . . However, the Commission’s approval of
    [Dominion]’s CCR cost deferral is based on the particular
    facts and circumstances presented in this docket and,
    therefore, is not precedent for the treatment of CCR costs
    in any future proceedings.
    In addition, the Commission finds and concludes that the
    treatment of CCR costs incurred by [Dominion] after June
    30, 2016, shall be reviewed in a future rate case, subject to
    the provisions of the Stipulation regarding future
    amortization periods, deferral of future CCR expenditures,
    continuing amortization and deferral of CCR expenditures,
    and any other arguments or positions presented by the
    Company, the Public Staff, or another party at that time.
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    Further, the Commission's determination in this case shall
    not be construed as determining the prudence and
    reasonableness of the Company's overall CCR plan, or the
    prudence and reasonableness of any specific CCR
    expenditures other than the ones deferred and authorized
    to be recovered in this case.
    Id. at *152-53. Based upon these findings, the Commission approved the stipulation
    between Dominion and the Public Staff “in its entirety,” so that Dominion was
    allowed to amortize the coal ash-related costs that it had incurred prior to 30 June
    2016 over a period of five years and to earn a return on the unamortized balance. Id.
    at *374.
    ¶5         On 1 June 2017, Duke Energy Progress filed an application for a general rate
    increase that included, among other things, a request to account for certain coal ash-
    related remediation costs in the calculation of its North Carolina retail rates and
    charges. State ex rel. Utils. Comm’n v. Stein, 
    375 N.C. 870
    , 880 (2020). Similarly, on
    25 August 2017, Duke Energy Carolinas filed an application with the Commission
    seeking a general rate increase that reflected certain costs relating to the closure of
    coal ash basins and other coal ash-related compliance costs in the calculation of its
    North Carolina retail rates and charges.       
    Id.
     at 880–81.   The Public Staff, the
    Attorney General, the Sierra Club, and several other parties intervened in these
    proceedings for the purpose of arguing that the Commission should not allow Duke
    to include some or all of these coal ash-related costs in the calculation of its North
    Carolina retail rates and charges, id. at 881, in light of Duke’s alleged
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    Opinion of the Court
    mismanagement of its coal ash basins, with the Public Staff having urged the
    Commission to adopt an “equitable sharing” plan that would have resulted in a 50-50
    sharing of these costs between Duke’s shareholders and ratepayers. Application by
    Duke Energy Progress, LLC, for Adjustment of Rates and Charges Applicable to Elec.
    Util. Serv. in N.C.; Application by Duke Energy Carolinas, LLC, for Adjustment of
    Rates and Charges Applicable to Elec. Util. Serv. in N.C., 2021 N.C. PUC LEXIS 723,
    *1 (N.C.U.C. June 25, 2021).       After conducting an evidentiary hearing, the
    Commission entered orders allowing Duke Energy Progress and Duke Energy
    Carolinas to amortize the coal ash-related costs that they had accumulated between
    2015 and 2017 over a five-year period, and to earn a return on the unamortized
    balance of these costs. Id. at *1–2. On the other hand, the Commission imposed a
    $30 million mismanagement penalty on Duke Energy Progress and a $70 million
    mismanagement penalty on Duke Energy Carolinas as a result of the manner in
    which the companies had handled their coal combustion residuals. Id. at *2.
    ¶6         After the entry of these orders, the Attorney General, the Public Staff, and the
    Sierra Club sought relief from the Commission’s orders before this Court. Stein, 
    375 N.C. 870
    . As is discussed in more detail below, this Court determined in Stein that
    the Commission had the authority to allow Duke Energy to amortize coal ash-related
    costs in its North Carolina retail rates and charges and to allow the recovery of a
    return on the unamortized balance of those costs pursuant to N.C.G.S. § 62-133(d)
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    given that the enactment of the CCR Rule and other state laws regulating coal ash
    storage and disposal had “forced [Duke Energy] to confront an ‘extraordinary and
    unprecedented’ issue involving the potential expenditure of billions of dollars in order
    to address a significant environmental problem.” Id. at 926. On the other hand, this
    Court also found that the Commission was “required to consider all material facts of
    record” in the course of exercising its authority to consider “other facts” pursuant to
    N.C.G.S. § 62-133(d), that the Commission had failed to consider certain facts
    “pertaining to alleged environmental violations,” and that both cases should be
    remanded to the Commission for the purpose of reconsidering the Public Staff’s
    “equitable sharing” proposal in light of a correct understanding of the applicable law.
    Id. at 931–33.
    ¶7         After this Court’s decision in Stein, Duke Energy entered into a settlement
    agreement with the Public Staff, the Attorney General, and the Sierra Club, 2021
    N.C. PUC LEXIS 723, *10, for the purpose of “resolv[ing] not only the 2017 rate cases
    on remand from the Court but also the 2019 rate cases and future CCR costs to be
    incurred through” 2030 for both Duke Energy Progress and Duke Energy Carolinas.
    Id. at *27. In this settlement, Duke agreed to a significant reduction in the amount
    of coal ash-related costs that were to be included in the calculation of the companies’
    rates, with “the net present value of the savings to [ratepayers] from forgone CCR
    cost recovery (including applicable financing costs) [having] amount[ed] to more than
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    $900 million,” id. at *29, including a $261,000,000 reduction in the amount of coal
    ash-related costs included in Duke Energy Progress’ North Carolina retail rates, a
    $224,000,000 reduction in the amount of coal ash-related costs included in Duke
    Energy Carolina’s North Carolina retail rates, “future reduced recovery of CCR costs
    through . . . 2030 of $162 million [for Duke Energy Progress] and $108 million [for
    Duke Energy Carolinas], and other additional customer-savings provisions.” Id. at
    *30. On 25 June 2021, the Commission entered an order approving the proposed coal
    ash cost-related settlement. Id. at *37.
    C. Procedural History of the Current Dominion Rate Case
    ¶8         On 27 February 2019, Dominion filed a Notice of Intent to File a General Rate
    Application with the Commission in Docket No. E-22, Sub 562. On 29 March 2019,
    Dominion filed an application with the Commission for the purpose of seeking a
    $26,958,000 increase in its North Carolina retail rates and charges. On 17 September
    2019, Dominion and the Public Staff entered into a stipulation resolving all of the
    matters at issue in this case with the exception of “issues associated with coal
    combustion residuals (CCR) costs.”         The Commission conducted an evidentiary
    hearing for the purpose of resolving the issues that remained in dispute between the
    parties.
    ¶9         In the course of a hearing held before the Commission for the purpose of
    receiving expert witness testimony on 23 September 2019, Jason E. Williams testified
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    on behalf of Dominion that the Company had “historically managed CCR consistently
    with evolving industry standards and regulatory requirements”; that, by 1988, 80%
    of the coal ash generated at Dominion’s coal-fired generating facilities was stored in
    surface impoundments or landfills; and that the actions that the Company had taken
    “to comply with the federal and state requirements have been reasonable and
    prudent.” Jay Lucas, on the other hand, testified for the Public Staff for the purpose
    of describing its “equitable sharing recommendation,” pursuant to which Dominion
    shareholders would be required to cover 40% of the relevant coal ash costs while the
    remaining 60% would be included in calculating Dominion’s North Carolina retail
    rates.
    ¶ 10            According to Mr. Lucas, while the Public Staff’s equitable sharing plan was not
    predicated upon the use of a prudence standard, pursuant to which 100% of the
    company’s coal ash-related costs would have been disallowed, at least in his opinion,
    the agency’s proposal made sense in light of the magnitude and nature of Dominion’s
    coal ash remediation costs and the extent of Dominion’s culpability for the resulting
    environmental contamination given the company’s “fail[ure] to improve its CCR
    management practices despite the evolving knowledge of the risk of unlined CCR
    storage at the time,” which indicated that “wet storage of CCR in unlined surface
    impoundments was detrimental to the quality of surrounding groundwater and
    surface water.” Mr. Lucas described multiple known exceedances of the applicable
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    Opinion of the Court
    groundwater contaminant limits at several of Dominion’s coal ash sites, including an
    exceedance at the company’s Possum Point facility in the 1980s; elevated trace metal
    levels in the groundwater, surface water, and soil surrounding the Chisman Creek
    facility; and 548 instances of groundwater exceedances which resulted from
    Dominion’s failure to prevent the leaching of coal combustion residuals from its
    surface impoundments. In addition, Mr. Lucas described six different instances in
    which environmental groups, local government entities, and property owners had
    initiated legal proceedings against Dominion as the result of pollution stemming from
    the leaching of coal ash contaminants, including arsenic, into surface waters from wet
    impoundments. When asked why the Public Staff’s proposed “equitable sharing” plan
    in this case was more favorable to Dominion than the plan that the Public Staff had
    proposed in the 2017 Duke Energy rate cases, Mr. Lucas responded that Dominion
    had “not been found guilty of criminal negligence with respect to its management of
    waste coal ash facilities” and that there was “less evidence” of harmful environmental
    impacts than had been the case with respect to Duke Energy’s facilities.
    ¶ 11         In the same vein, Public Staff witness Michael C. Maness defended the Public
    Staff’s “equitable sharing” proposal on the grounds that:
    [t]he total amount of the costs is large (approximately $377
    million on a system level and approximately $22 million on
    a North Carolina retail level), which amounts to
    approximately $179 per North Carolina retail customer, or
    $60 per year per North Carolina retail customer, before
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    considering the impact of including the unamortized
    amount in rate base.
    [Dominion] will be incurring significant additional costs in
    the future related to the CCR Excavation Act (Virginia
    Senate Bill 1355).
    The incurrence of these costs will not provide any benefits
    to customers in terms of additional electric service or
    improvements to service.
    The incurrence of CCR costs has not been the result of
    economic analysis that pointed toward an action that
    would be economically advantageous to ratepayers.
    . . . [T]he Commission has implemented equitable sharing
    in several past circumstances involving incurred costs that
    did not provide any future benefits to retail customers.
    According to Mr. Maness, the Public Staff’s proposal that ratepayers bear 60% of the
    costs and that shareholders bear 40% of the costs was appropriate in light of the
    manner in which Dominion had managed its coal combustion residuals and the
    nature and magnitude of the resulting costs and that the resulting “equitable
    sharing” could be achieved by precluding Dominion from earning a return on the
    unamortized balance of its coal ash-related costs and by amortizing the costs over an
    eighteen-year period, with it being likely that “the Public Staff would . . . recommend
    some level of sharing even in the absence of environmental culpability, due to the
    magnitude and/or nature of the costs.”
    ¶ 12         In rebuttal, Mr. Williams denied that Dominion had failed to properly manage
    its coal combustion residuals, asserting that “the Public Staff has acknowledged that
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    Opinion of the Court
    it is not capable of or willing to identify a specific action the Company could have
    taken in the past,” that “neither the Company nor the Public Staff could find any
    example prior to 2016 where the Public Staff had raised any concerns regarding
    groundwater or surface water issues,” and that the Public Staff should refrain from
    acting as an environmental regulator in the course of judging the prudence of the
    Company’s past actions. Based upon this logic, Mr. Williams concluded that the
    Public Staff’s proposal to disallow admittedly prudent and reasonable costs on the
    basis of “equitable sharing” was “shortsighted and could lead to an unpredictable and
    unhealthy regulatory environment for utilities and their customers.”
    ¶ 13          On 24 February 2020, the Commission entered an order in which it found as
    fact that:
    Recovery of CCR Costs
    49.    Since its last rate case, on a North Carolina
    retail jurisdictional basis, from the period beginning July
    1, 2016 and running through June 30, 2019 (the Deferral
    Period), [Dominion] has incurred $21.8 million in costs
    associated with the management of CCRs (the CCR Costs).
    The $21.8 million includes: (1) $19.2 million in
    expenditures made during the Deferral Period to comply
    with federal and state environmental regulations
    associated with managing CCRs and converting or closing
    waste ash management facilities at seven of [Dominion]’s
    generation stations; and (2) $2.7 million in financing costs
    incurred during the Deferral Period.
    50.    The record includes substantial evidence that,
    particularly where CCRs were being managed in lined
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    landfills, the CCR Costs incurred during the Deferral
    Period were prudently incurred.
    51.    Although the Public Staff offered evidence
    challenging the manner in which [Dominion] had managed
    CCRs and its various CCR waste management facilities
    over several decades, insofar as the specific CCR Costs
    incurred during the Deferral Period are concerned, while
    the record contains evidence that identifies instances of
    imprudence, the record contains insufficient evidence to
    permit the Commission to quantify the effects of imprudent
    actions on ratepayers.
    52.    [Dominion] is entitled to recover the CCR
    Costs established in this general rate case, in the manner
    and subject to the conditions as set forth herein.
    In addition, the Commission noted that the order that it had entered in connection
    with the Company’s 2016 rate case did “not have precedential value with respect to
    the CCR issues in this case” because the stipulation between Dominion and the Public
    Staff that had been approved in that proceeding provided that:
    [t]he Public Staff’s agreement in this proceeding to the
    deferral and amortization of CCR expenditures incurred
    through June 30, 2016, shall not be construed as a
    recommendation that the Commission reach any
    conclusions regarding the prudence and reasonableness of
    the Company’s overall CCR plan, or regarding any specific
    expenditures other than the ones to be recovered in this
    case.
    Moreover, the Commission noted that it had explicitly stated that its order in that
    proceeding should “not be construed as determining the prudence and reasonableness
    of [Dominion]’s overall CCR plan, or the prudence and reasonableness of any specific
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    CCR expenditures other than the ones deferred and authorized to be recovered in this
    case,” Application of Va. Elec. & Power Co., Ord. Approving Rate Increase and Cost
    Deferrals and Revising PJM Regul. Conditions, Docket No. E-22, Sub 532, at *3
    (N.C.U.C. Dec. 22, 2016), and that it would be “inappropriate to give the 2016
    [Dominion] Rate Case Order precedential effect” in view of the fact that the evidence
    that had been presented in that proceeding was “far less extensive” than the evidence
    that had been presented in this proceeding given that Dominion and the Public Staff
    had entered into a stipulation in the earlier proceeding, so that the “issues of
    prudence and reasonableness were not fully litigated and no significant evidentiary
    record was developed.”
    ¶ 14         According to the Commission, Dominion had made a prima facie showing that
    the coal ash-related costs that it had incurred between 1 July 2016 and 30 June 2019
    had been prudently incurred in light of the fact that the company had largely
    discontinued wet storage of coal ash and moved towards storing dry ash in lined
    landfills. On the other hand, the Commission noted that, even though the Public
    Staff had not “expressed [an] opinion on the prudence and reasonableness of the [coal
    ash c]osts,” one of its witnesses had “testified to a number of deficiencies in
    [Dominion]’s historical management of [coal ash] and the resulting environmental
    impacts,” such as late and deficient groundwater monitoring, the decision to ignore a
    recommendation to construct a dry waste disposal facility at one of the coal ash sites,
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    and groundwater data showing exceedances of certain elements and heavy metals
    such as barium, cadmium, copper, iron, manganese, nickel, phenols, potassium,
    sodium, and zinc at one of the coal ash sites. In addition, the Commission noted the
    existence of evidence that “call[ed] into question” the prudence of the manner in
    which Dominion had incurred certain coal ash-related costs, such as the fact that,
    prior to the adoption of the CCR Rule, Dominion had planned to permanently store
    some of its coal ash in unlined wet ponds and to cover the ponds with soil, a practice
    that was likely to cause hydraulic pressure in the ponds and facilitate the continued
    migration of coal ash-related pollutants into the surrounding groundwater.
    ¶ 15         In finding that Dominion’s coal ash costs had been prudently incurred, the
    Commission noted that, “while the evidence demonstrates a difference of opinion or
    dispute as to whether certain [of Dominion]’s actions, omissions or decisions were
    prudent,” neither party had “presented evidence to attempt to quantify which, if any,
    of the [coal ash c]osts might have been avoided if [Dominion] had used a different
    approach to managing [coal ash recovery] at some point during the last several
    decades” and stated that
    it would be very difficult to go back and recreate the timing
    and cost of such different approaches. For example, one
    could argue that [Dominion] should have converted all of
    its coal-fired plants to dry ash handling at least at some
    time during the 1990s. However, to quantify the costs and
    benefits of this strategy would require establishing, with
    some level of certainty, the costs that [Dominion] would
    have incurred for such conversions, and the savings in
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    present [coal ash] remediation costs that would have
    resulted from such conversions. In addition, [Dominion]
    could have been entitled to recover those conversion costs,
    plus a return on its increased rate base, from its ratepayers
    over the past several decades. On the present record, the
    Commission has no substantial evidence on which to make
    such determinations. Thus, based on the foregoing, . . . the
    Commission concludes that the [coal ash c]osts were
    prudently incurred.
    ¶ 16         After reaching this conclusion, the Commission determined that it would be
    “just and reasonable” to deny Dominion a return on the unamortized balance of the
    coal ash costs that it had incurred between 1 July 2016 and 30 June 2019 and to
    permit the amortization of those costs over a ten-year period. In support of this
    result, the Commission concluded that:
    Ratemaking Treatment of Recoverable CCR Costs
    53.     Just and reasonable rates will be achieved by
    excluding from rate base the CCR Costs and amortizing
    recovery of the CCR Costs over a period of ten years.
    54.    It is reasonable, based on the evidence in the
    record in this proceeding, for [Dominion] to recover its
    financing costs on the CCR Costs incurred during the
    Deferral Period, up to the effective date of rates approved
    pursuant to this Order, calculated at [Dominion]’s
    previously authorized weighted average cost of capital.
    55.    It is reasonable, based on the evidence in the
    record in this proceeding for annual compounding to be
    used in calculating the financing costs of deferred costs,
    including the CCR Costs, during the Deferral Period.
    STATE EX REL. UTILS. COMM’N V. VIRGINIA ELEC.
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    Opinion of the Court
    As further support for this determination, the Commission reasoned that Dominion
    should not be allowed to earn a return on the unamortized balance of coal ash costs
    in light of:
    (1) the Commission’s obligation to set just and reasonable
    rates that are fair to both the utility and the ratepayer in
    accordance with N.C.G.S. § 62-133(a); (2) the Commission’s
    historical treatment of extraordinary, large costs, such as
    [Manufactured Gas Plant] environmental remediation
    costs and plant cancellation costs; and (3) the
    Commission’s obligation to consider all other material facts
    of record that will enable it to determine what are just and
    reasonable rates in accordance with N.C.G.S. § 62-133(d).
    More specifically, the Commission noted that, when Public Service Company of North
    Carolina, Inc., had sought recovery of substantial costs incurred for the purpose of
    remediating hazardous by-products that were created at manufactured natural gas
    plants, it had determined that, while the utility should be authorized to amortize its
    prudently incurred remediation costs to rates over a period of years, the company
    should not be allowed earn a return on the unamortized balance of those costs on the
    grounds that such a result struck the “proper balance between ratepayer and
    shareholder interests” and gave the utility “an incentive to minimize clean-up costs
    and to pursue contributions from third parties where appropriate.” In addition, the
    Commission cited to a 1983 order in a proceeding in which Dominion had sought to
    include costs associated with the abandonment of certain proposed nuclear
    generating facilities in the calculation of its North Carolina retail rates, Application
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    Opinion of the Court
    of Va. Elec. and Power Co. for Auth. to Adjust and Increase Its Elec. Rates and
    Charges, No. E-22, Sub 273, 73 N.C.U.C. Orders & Decisions 343, 355 (Dec. 5, 1983),
    and in which the Commission had concluded that, while the relevant nuclear plant
    abandonment costs had been prudently incurred and should be amortized to rates,
    Dominion should not be allowed to earn a return on the unamortized balance of those
    costs on the theory that “[a] middle ground must be found on which the Company
    bears some of the risk of abandonment and the ratepayer is protected from
    unreasonably high rates.” Id.
    ¶ 17         Furthermore, the Commission concluded that it had a “well-established history
    of allocating prudently incurred costs, specifically in the context of extraordinary,
    large costs such as environmental clean-up and plant cancellation costs, between
    ratepayers and shareholders in order to strike a fair and reasonable balance” and
    that “fairness dictate[d] this same treatment” in the present proceeding. According
    to the Commission, “[a] number of material facts in evidence call[ed] into question
    the prudence” of Dominion’s coal ash-related costs, including the occurrence of
    groundwater violations and its refusal to build a dry waste storage facility at the
    Possum Point plant contrary to the standards for coal ash storage that the
    Environmental Protection Agency had adopted by that time. The Commission further
    noted that the total amount of coal ash-related costs that Dominion had incurred
    during the relevant period was “significant” and would affect the rates paid by end-
    STATE EX REL. UTILS. COMM’N V. VIRGINIA ELEC.
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    Opinion of the Court
    user customers. Finally, the Commission concluded that allowing Dominion to earn
    a return on the unamortized balance of the relevant coal ash-related costs would
    “violate[ ] the matching principle and raise[ ] intergenerational equity concerns” by
    requiring current customers to pay for the remediation of waste associated with past
    power generation. As authorized by N.C.G.S. § 62-133(d), the Commission stated
    that it had “consider[ed] these material facts of record when striking the appropriate
    balance between shareholder and customer interests to set just and reasonable rates”
    and concluded that “[a] fair and reasonable balance is found which requires
    [Dominion]’s shareholders to bear some of the risk of clean-up costs associated with
    CCR liabilities and protects the ratepayers from unreasonably high rates.”
    ¶ 18         In determining that Dominion’s coal ash costs should be amortized to rates
    over a period of ten years, the Commission found that Dominion’s “proposed five-year
    amortization period does not achieve a fair balance in light of the evidence in the
    record, the magnitude and the nature of the costs involved and the rate impact to
    customers.” On the other hand, the Commission declined to accept the Public Staff’s
    proposed eighteen-year amortization period on the grounds that a ten-year
    amortization period struck a “more appropriate and fairer balance” and was
    consistent with the Commission’s “historical treatment of major plant cancellations”
    as evidenced by the fact that the Commission had “consistently used a write-off period
    of 10 or fewer years for all major plant cancellations.” Application of Va. Elec. and
    STATE EX REL. UTILS. COMM’N V. VIRGINIA ELEC.
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    Opinion of the Court
    Power Co. for Auth. to Adjust and Increase Its Elec. Rates and Charges, No. E-22, Sub
    273, 73 N.C.U.C. Orders & Decisions 343, 355.                As a result, the Commission
    authorized the amortization of the coal ash-related costs that Dominion had incurred
    between 1 July 2016 and 30 June 2019 to rates over a ten year period while
    disallowing Dominion’s request to be allowed to earn a return on the unamortized
    balance of those costs.2        Dominion noted an appeal to this Court from the
    Commission’s order.3
    II.     Analysis
    A. Standard of Review
    ¶ 19          According to N.C.G.S. § 62-94 (2021), the applicable standard of review utilized
    by this Court in reviewing Commission orders requires us to
    decide all relevant questions of law, interpret
    constitutional and statutory provisions, and determine the
    meaning and applicability of the terms of any Commission
    action. The court may affirm or reverse the decision of the
    Commission, declare the same null and void, or remand the
    2  Before an appeal was noted to this Court from the Commission’s order, both
    Dominion and the Public Staff filed motions seeking reconsideration and clarification of the
    Commission’s decision. In upholding its decision to refrain from awarding Dominion a return
    on the unamortized balance of the deferred coal-ash-related costs, the Commission stated
    that it had “fully considered all of the facts in evidence, applied the various provisions of the
    Act to those facts in evidence and reached its decisions . . . in the interest of achieving just
    and reasonable rates.” Similarly, in upholding its decision to require the use of a ten-year
    amortization period, the Commission stated that it had “fully considered all of the facts in
    evidence and the applicable precedents in reaching its decision to set the amortization period
    for CCR Costs at ten years.”
    3 Although the Attorney General initially noted a cross-appeal from the Commission’s
    order, he subsequently sought and obtained the entry of an order dismissing this cross-
    appeal.
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    Opinion of the Court
    case for further proceedings; or it may reverse or modify
    the decision if the substantial rights of the appellants have
    been prejudiced because the Commission's findings,
    inferences, conclusions or decisions are:
    (1)    In violation of constitutional provisions, or
    (2) In excess of statutory authority or jurisdiction of the
    Commission, or
    (3)    Made upon unlawful proceedings, or
    (4)    Affected by other errors of law, or
    (5)   Unsupported    by   competent,  material   and
    substantial evidence in view of the entire record as
    submitted, or
    (6)    Arbitrary or capricious.
    N.C.G.S. § 62-94(b). A Commission decision is “arbitrary and capricious when, among
    other things, [it] indicate[s] a lack of fair and careful consideration or fail[s] to display
    a reasoned judgment.” State ex rel. Utils. Comm’n v. Thornburg, 
    314 N.C. 509
    , 515
    (1985).    In deciding whether to affirm, reverse, invalidate or remand the
    Commission’s decision for further proceedings, we are required to review “the whole
    record or such portions thereof as may be cited by any party” and take “due account”
    of “the rule of prejudicial error.” N.C.G.S. § 62-94(c).
    ¶ 20          According to well-established North Carolina law, “the rates fixed or any rule,
    regulation, finding, determination, or order made by the Commission” are considered
    “prima facie just and reasonable.” Id. at § 62-94(e). For that reason,
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    Opinion of the Court
    [t]he burden is on the appellant to demonstrate an error of
    law in the proceedings. To be arbitrary and capricious, the
    Commission’s order would have to show a lack of fair and
    careful consideration of the evidence or fail to display a
    reasoned judgment.
    State ex rel. Utilities Comm’n v. Piedmont Nat. Gas Co., 
    346 N.C. 558
    , 573 (1997)
    (citations omitted). A reviewing court examines the Commission’s findings of fact for
    the purpose of determining whether they are supported by “competent, material and
    substantial evidence,” State ex rel. Utils. Comm’n v. Cooper, 
    367 N.C. 444
    , 448 (2014),
    with the Commission being “responsible for determining the weight and credibility to
    be afforded to the testimony of any witness, including any expert opinion testimony,”
    and with the Commission’s “decision being entitled to great deference given that its
    members possess an expertise in utility ratemaking.” State ex rel. Utilities Comm’n
    v. Stein, 375 N.C. at 900.     “Assuming adequate findings of fact, supported by
    competent, substantial evidence, the Commission’s determination, reached pursuant
    to the mandate of N.C.G.S. § 62-133 and to the statutory procedural requirements,
    may not be reversed even if [this Court] would have reached a different conclusion
    upon the evidence.” Id. (cleaned up) (quoting State ex rel. Utils. Comm’n v. Morgan,
    
    277 N.C. 255
    , 266–67 (1970)). The Commission’s conclusions of law are, however,
    subject to de novo review for legal error on appeal. State ex rel. Utils. Comm’n v. N.C.
    Waste Awareness & Reduction Network, 
    255 N.C. App. 613
    , 615 (2017), aff’d per
    curiam, 
    371 N.C. 109
     (2018).
    STATE EX REL. UTILS. COMM’N V. VIRGINIA ELEC.
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    Opinion of the Court
    B. Denial of a Return on the Unamortized Balance of CCR Costs
    ¶ 21         In its initial challenge to the Commission’s order, Dominion argues that the
    Commission erred by rejecting its request to be allowed to earn a return on the
    unamortized balance of its coal ash-related costs.        According to Dominion, the
    Commission “failed to set forth any facts to support its break with its own precedent”
    that was established in the 2016 Dominion rate case and 2017 Duke Energy rate
    cases, with this failure to follow its own past precedent compelling the conclusion that
    the Commission had acted arbitrarily and capriciously in violation of the Public
    Utilities Act and the relevant provisions of the state and federal constitutions.
    ¶ 22         According to Dominion, this Court held in Stein that the Commission had
    correctly determined that the Duke Energy utilities should be allowed to earn a
    return on the unamortized balance of their coal ash costs, with the findings that the
    Commission had made in that case having sufficed to establish that the enactment of
    the CCR Rule and certain North Carolina statutory provisions “forced the utilities to
    confront an ‘extraordinary and unprecedented’ issue involving the potential
    expenditure of billions of dollars in order to address a significant environmental
    problem” and that, in light of “the ‘magnitude, scope, duration and complexity’ of the
    anticipated costs” of coal ash cleanup, a return on the unamortized balance was fair
    and just. Stein, 375 N.C. at 926. Dominion claims that, since the facts at issue in
    this case are similar to those that were before the Commission in Stein, the
    STATE EX REL. UTILS. COMM’N V. VIRGINIA ELEC.
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    Opinion of the Court
    Commission acted arbitrarily and capriciously “by exercising its discretion differently
    and to the detriment of [Dominion] in this case after exercising it to the benefit of
    Duke Energy.”
    ¶ 23         After conceding that Commission decisions are “not automatically binding on
    future Commissions,” Dominion contends that the Commission “explicitly chose to
    give its ratemaking treatment of coal ash costs in the 2016 [Dominion] rate case
    decision precedential value” in deciding the 2017 Duke Energy rate case and that the
    Commission “provided no reasoned basis for departing from its 2016 [Dominion] Rate
    Case Order” when deciding this case, even though it “involved the same coal plants
    and same types of costs.” In Dominion’s view, even though the Commission heard
    the “same theories” regarding the imprudence with which coal combustion residuals
    had been handled in this case that it had heard in the 2016 Dominion rate case and
    2017 Duke Energy rate cases, it “reached a different result — denying a return on
    prudently incurred costs — without ever concluding that [Dominion] imprudently
    managed its coal ash.” As a result of the fact that the Commission found that the
    record did not support a finding of imprudence even though the evidence “raise[d]
    questions” about the prudence with which Dominion’s coal ash-related costs had been
    incurred and that, “given the passage of time and evolving regulatory standards,”
    Dominion was entitled to a presumption of prudency, the Commission “arbitrarily
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    Opinion of the Court
    and unlawfully created a separate, lower standard” by finding that Dominion’s
    conduct was less than prudent but more than imprudent.
    ¶ 24         Furthermore, Dominion argues that the Commission had acted arbitrarily and
    capriciously by determining that Dominion’s coal ash-related costs did not constitute
    property that was “used and useful” after reaching the opposite conclusion in the 2016
    Dominion rate case, in which it had determined that “existing CCR repositories
    continue to be used and useful for storing CCRs, and will continue to be used and
    useful until [Dominion] moves the CCRs to a permanent repository.”          Dominion
    claims that the arbitrary and capricious nature of the Commission’s order is
    demonstrated by the fact that it allows a return on the company’s coal ash-related
    costs during the deferral period, which ran from 1 July 2016 through 30 June 2019,
    while refusing to allow a return on those same costs during the subsequent recovery
    period.
    ¶ 25         In Dominion’s view, “[t]he coal ash costs at issue in this case deserved, but did
    not receive, the same treatment” that they had received in the 2016 Dominion rate
    cases and the 2017 Duke Energy cases. Dominion claims that, even though “[a]ny
    differences that exist between [Dominion] and Duke Energy warrant more favorable
    ratemaking treatment for” Dominion given that Duke Energy had pled guilty to the
    commission of environmental crimes, including criminal negligence, while there had
    been no similar findings of mismanagement or unlawful activity on the part of
    STATE EX REL. UTILS. COMM’N V. VIRGINIA ELEC.
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    Opinion of the Court
    Dominion, “[Dominion] finds itself in a far worse position than Duke Energy.”
    According to Dominion, the Commission “failed to articulate any grounds for treating
    [Dominion] differently than Duke Energy” and, in spite of the fact that the
    Commission is “not bound by the doctrines of res judicata or stare decisis, the
    Commission cannot ‘arbitrarily’ disregard its own precedent,” quoting N.C.G.S. § 62-
    94(c) and State ex rel. Utils. Comm’n v. Nantahala Power & Light Co., 
    326 N.C. 190
    ,
    199 (1990) (holding that, although “the Commission is not covered by our
    Administrative Procedure Act,” it is “still an administrative agency of the state
    government, and general tenets of administrative law are applicable to its operation
    except where modified by statute”). In spite of this fact, Dominion contends that the
    Commission’s “discussion of the 2016 [Dominion] rate case is limited to explaining
    that a stipulation precludes it from being considered precedent here” even though
    that decision “was accepted as precedent in the Duke Energy rate cases,” with the
    Commission’s failure to explain the reasons for its decision to treat the two utilities
    differently constituting arbitrary and capricious decision-making.
    ¶ 26         Finally, Dominion asserts that the Commission’s failure to afford equal
    treatment to Duke and Dominion violates the equal protection clauses of the state
    and federal constitutions, with the company having directed our attention to Cheek
    v. City of Charlotte, 
    273 N.C. 293
     (1968), in which this Court held that legislation
    prohibiting the provision of massages to a member of the opposite sex at massage
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    Opinion of the Court
    parlors, but not at barber shops or health clubs, was arbitrary and constituted
    impermissibly discriminatory legislation, and Connecticut Light & Power Co. v. Fed.
    Energy Regul. Comm’n, 
    627 F.2d 467
    , 473 (D.C. Cir. 1980), in which the United States
    Court of Appeals for the District of Columbia Circuit noted that “treating regulated
    entities, whose apparent fact situation is stipulated to be the same, in a markedly
    different manner might give rise to an Equal Protection problem.” According to
    Dominion, the Commission’s “fail[ure] to articulate any factors or rational basis for
    subjecting [Dominion] to different treatment than identically situated North Carolina
    electric utilities” violated Dominion’s right to equal protection.
    ¶ 27         In seeking to persuade us to affirm the Commission’s order, the Public Staff
    argues that the Commission properly exercised its authority pursuant to N.C.G.S.
    § 62-133(d) by determining that Dominion should not be allowed to earn a return
    upon the unamortized balance of its coal ash-related costs. The Public Staff notes
    that the Commission’s ratemaking decisions are not subject to stare decisis or res
    judicata principles in light of the fact that such decisions are legislative, rather than
    judicial, in nature given that in, “fixing rates . . . the Commission [exercises] a
    function delegated to it by the legislative branch of government.” State ex rel. Utils.
    Com. v. Thornburg, 
    325 N.C. 463
    , 469 (1989) (holding that, since the Commission was
    exercising a legislative function, the manner in which it provided for the inclusion of
    nuclear cancellation costs in rates in prior cases was not entitled to res judicata
    STATE EX REL. UTILS. COMM’N V. VIRGINIA ELEC.
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    Opinion of the Court
    effect); see also State ex rel. Utils. Com. v. Carolina Util. Customers Ass’n, 
    348 N.C. 452
    , 472 (1998) (stating that “[a] final order of the [Commission] in a general rate
    case is not within the doctrine of stare decisis”).
    ¶ 28         According to the Public Staff, the Commission made sufficient findings of fact
    to “explain[ ] why a divergence from the usual ratemaking standards would be
    appropriate and why the approach that the Commission ha[d] adopted would be just
    and reasonable to both utilities and their customers” as required by this Court’s
    decision in Stein, 375 N.C. at 926. As an initial matter, the Public Staff points to the
    Commission’s discussion of three previous rate cases that involved including in rates
    the “extraordinary, large costs such as environmental clean-up and plant
    cancellation” costs and in which the Commission had apportioned the responsibility
    for those costs “between ratepayers and shareholders” by amortizing the costs to rates
    while denying the utility’s request to be allowed to earn a return on the unamortized
    balance. Secondly, the Public Staff directs our attention to the Commission’s finding
    that a “number of material facts in evidence call into question the prudence of
    [Dominion’s] actions and inaction and the risks accepted by [Dominion] management”
    at the utility’s coal ash disposal sites, arguing that this evidence provides further
    support for the Commission’s decision to require sharing of those costs between
    Dominion and its customers. See Stein, 375 N.C. at 931 (reversing the Commission’s
    order, in part, and holding that the Commission was required “to evaluate the extent
    STATE EX REL. UTILS. COMM’N V. VIRGINIA ELEC.
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    Opinion of the Court
    to which the utilities committed environmental violations” in setting the utility’s
    rates pursuant to N.C.G.S. § 62-133(d) “even if any such environmental violations did
    not result from imprudent management”).           Thirdly, the Public Staff notes the
    Commission’s reference to the “matching principle,” which “dictates that customers
    who use an asset should pay for the asset at the time it is used” instead of requiring
    “present and future customers [to] pay for costs incurred related to service provided
    in the past.” Fourthly, the Public Staff notes that utilities are generally required to
    collect asset retirement costs over the useful life of the asset, with the Commission
    having found that its order was “further supported by the failure of [Dominion] to
    properly account for the full decommissioning costs of its coal-fired power plants” and
    Dominion’s failure to include those costs in rates during the period when those
    facilities were actually being used to generate electricity.
    ¶ 29         The Public Staff denies that the Commission had erred by failing to make the
    same findings and conclusions in this case that it made in the 2016 Dominion rate
    case and the 2017 Duke Energy rate cases. In the Public Staff’s view, the Commission
    did, in fact, provide a “reasoned basis for departing from” its decision in the 2016
    Dominion order by pointing out that the 2016 order explicitly stated that it did “not
    have precedential value with respect to the [coal ash] issues” that were before the
    Commission in that case because the 2016 Dominion rate case involved a stipulation
    between Dominion and the Public Staff instead of having been fully litigated.
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    Opinion of the Court
    Similarly, the Public Staff contends that the Commission did not err by reaching a
    different outcome in this case than it had in the 2017 Duke rate cases, at least, in
    part, because the 2017 Duke rate cases were on appeal when this case was heard and
    decided and because the Commission’s orders in those cases were ultimately reversed
    by this Court in Stein, resulting in a settlement between Duke and certain
    intervenors that was markedly less favorable to Duke than the Commission’s initial
    orders. Finally, the Public Staff argues that the Commission’s decision does not work
    any sort of equal protection violation given that such challenges to a utility
    ratemaking decision must be rejected as long as the Commission’s decision is
    rationally related to a legitimate government purpose, which this one clearly is.
    ¶ 30         The rates for utility service charged by North Carolina retail ratepayers must
    be “just and reasonable.” N.C.G.S. § 62-131. For that reason, the Commission is
    required to fix rates that are “fair both to the public utilities and to the consumer,”
    N.C.G.S. § 62-133(a), by
    (1)    Ascertain[ing] the reasonable original cost or the
    fair value under G.S. 62-133.1A of the public utility’s
    property used and useful . . . in providing the service
    rendered to the public within the State, less that portion of
    the cost that has been consumed by previous use recovered
    by depreciation expense.
    ....
    (2)   Estimat[ing] such public utility’s revenue under the
    present and proposed rates.
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    Opinion of the Court
    (3)   Ascertain[ing] such public utility’s reasonable
    operating expenses, including actual investment currently
    consumed through reasonable actual depreciation.
    (4)    Fix[ing] such rate of return on the cost of the
    property ascertained pursuant to subdivision (1) of this
    subsection as will enable the public utility by sound
    management to produce a fair return for its shareholders,
    considering changing economic conditions and other
    factors, including, but not limited to, the inclusion of
    construction work in progress in the utility's property
    under sub-subdivision b. of subdivision (1) of this
    subsection, as they then exist, to maintain its facilities and
    services in accordance with the reasonable requirements of
    its customers in the territory covered by its franchise, and
    to compete in the market for capital funds on terms that
    are reasonable and that are fair to its customers and to its
    existing investors.
    N.C.G.S. § 62-133(b). In addition, the Commission is required, during the ratemaking
    process, to “consider all other material facts of record that will enable it to determine
    what are reasonable and just rates.” Id. § 62-133(d).
    ¶ 31         According to N.C.G.S. § 62-79(a), “all final orders and decisions of the
    Commission shall be sufficient in detail to enable the court on appeal to determine
    the controverted questions presented in the proceedings and shall include” “[f]indings
    and conclusions and the reasons or bases therefor upon all the material issues of fact,
    law, or discretion presented in the record.” According to well-established North
    Carolina law, “[t]he Commission . . . is not required to ‘comment upon every single
    fact or item of evidence presented by the parties.’ ” State ex rel. Utils. Comm’n v.
    Public Staff-N.C. Util. Comm’n, 
    323 N.C. 481
    , 496-97 (1988) (quoting State ex rel.
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    Opinion of the Court
    Utils. Comm’n v. Eddleman, 
    320 N.C. 324
    , 351 (1987)). Instead, “[t]he Commission’s
    summary of the appellant’s argument and its rejection of the same is sufficient to
    enable the reviewing court to ascertain the controverted questions presented in the
    proceeding,” which is all that is required. State ex rel. Utils. Comm’n v. Conservation
    Council of N.C., 
    312 N.C. 59
    , 62 (1984). As a result, this Court has held that findings
    of fact that “demonstrate that the Commission considered the impact of changing
    economic conditions upon customers” and that “specify how this factor influenced the
    Commission’s decision to authorize a 10.2% [return on equity],” State ex rel. Utils.
    Comm’n v Cooper, 
    367 N.C. 741
    , 748 (2015), were sufficient to pass muster on
    appellate review.
    ¶ 32         The essence of the argument that Dominion has presented for our
    consideration in this case is that, since the facts contained in the record developed in
    this case were essentially identical to those contained in the records developed in the
    company’s 2016 rate case and in the 2017 Duke Energy rate cases, the Commission
    erred by failing to conclude that Dominion was entitled to earn a return on the
    unamortized balance of its coal ash-related costs consistently with the decisions that
    the Commission had made in those earlier proceedings. In Stein, we addressed the
    issue of whether the Commission possessed the discretion, pursuant to N.C.G.S. § 62-
    133(d), to allow utilities to earn a return on their coal ash cleanup and recovery costs,
    even if such costs were characterized as operating expenses rather than as property
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    Opinion of the Court
    used and useful. 375 N.C. at 914. In holding that the Commission possessed the
    authority to act in this fashion, we noted that, even though the procedures for
    establishing just and reasonable rates as outlined in N.C.G.S. § 62-133(b) “provide a
    workable framework” for setting just and reasonable rates for utility service, the
    circumstances at issue in that case were “anything but ordinary, with the coal ash-
    related costs that [Duke Energy had] incurred between 1 January 2015 and 31
    December 2017 not being readily susceptible to traditional ratemaking analysis for a
    number of reasons.” Id. at 921.
    ¶ 33         After a thorough analysis of this Court’s prior decisions interpreting the nature
    and extent of the Commission’s authority pursuant to N.C.G.S. § 62-133(d), we
    determined that our precedent “clearly indicated that N.C.G.S. § 62-133(d) is
    available to the Commission for the purpose of dealing with unusual situations and
    that the authority granted to the Commission pursuant to N.C.G.S. § 62-133(d) is not
    limited by the more specifically stated ratemaking principles set out elsewhere in
    N.C.G.S. § 62-133(b).” Id. at 925. As a result, we held that
    the Commission may employ N.C.G.S. § 62-133(d) in
    situations involving (1) unusual, extraordinary, or complex
    circumstances that are not adequately addressed in the
    traditional ratemaking procedures set out in N.C.G.S. § 62-
    133; (2) in which the Commission reasonably concludes
    that these circumstances justify a departure from the
    ordinary ratemaking standards set out in N.C.G.S. § 62-
    133; (3) determines that a consideration of these “other
    facts” is necessary to allow the Commission to fix rates that
    are just and reasonable to both the utility and its
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    Opinion of the Court
    customers; and (4) makes sufficient findings of fact and
    conclusions of law supported by substantial evidence in
    light of the whole record explaining why a divergence from
    the usual ratemaking standards would be appropriate and
    why the approach that the Commission has adopted would
    be just and reasonable to both utilities and their customers.
    Id. at 926.
    ¶ 34         In applying the four-part test enunciated in Stein to the facts at issue in that
    proceeding, we determined that the Commission had not erred “by allowing the
    amortization of deferred coal ash costs to rates” and by allowing Duke Energy “to
    earn a return on the unamortized balance” of those costs in that case given that “the
    enactment of CAMA forced [Duke Energy] to confront an ‘extraordinary and
    unprecedented’ issue involving the potential expenditure of billions of dollars in order
    to address a significant environmental problem” and that, “[i]n light of the
    ‘magnitude, scope, duration and complexity’ of the anticipated costs,” a return on the
    unamortized balance of the costs would reasonable. Id. at 926. On the other hand,
    we also held that, once the Commission had decided to invoke its authority pursuant
    to N.C.G.S. § 62-133(d) to consider “other facts,” it “was required to consider all
    material facts of record . . . including, in these cases, facts pertaining to alleged
    environmental violations such as non-compliance with NPDES permit conditions,
    unauthorized discharges, and groundwater contamination from the coal ash
    basins[.]” Id. at 931. In view of the fact that the Commission “appear[ed] to have
    determined that it lacked the authority to comment upon the nature and extent of
    STATE EX REL. UTILS. COMM’N V. VIRGINIA ELEC.
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    Opinion of the Court
    any environmental violations that the utilities may or may not have committed” in
    setting rates pursuant to N.C.G.S. § 62-133(d), we reversed the portion of the
    Commission’s order that rejected the Public Staff’s “equitable sharing” proposal and
    remanded this case to the Commission for further proceedings, including the making
    of appropriate findings of fact and conclusions of law relating to the validity of the
    Public Staff’s proposal. Id. at 932–33.
    ¶ 35         Over two decades ago, this Court upheld the Commission’s use of its
    discretionary authority pursuant to N.C.G.S. § 62-133(d) to allow a utility to amortize
    nuclear plant cancellation costs while rejecting the utility’s request to earn a return
    on the unamortized balance of those costs in State ex rel. Utilities Comm’n v.
    Thornburg, 
    325 N.C. 463
     (1989). In Thornburg, the utility sought a general rate
    increase that was predicated, in part, upon an attempt to reflect the costs associated
    with the abandonment of a proposed nuclear generating facility at the Shearon
    Harris nuclear plant in its retail rates. 
    Id. at 465
    . In its opinion, the Court noted
    that, in a previous rate case regarding two other cancelled nuclear units at the
    Shearon Harris site, the Commission had allowed the utility to amortize the
    cancellation costs associated with the two other units “over a ten-year period” while
    determining that “no return [would be] allowed on or with respect to the unamortized
    balance” of the cancellation costs. 
    Id. at 466
    . In the case that was actually before
    this Court, the Commission allowed the utility to amortize the relevant cancellation
    STATE EX REL. UTILS. COMM’N V. VIRGINIA ELEC.
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    Opinion of the Court
    costs to rates over a period of ten years without allowing the utility to earn a return
    on the unamortized balance.      On appeal, the Attorney General argued that the
    Commission had acted beyond the scope of its statutory authority in allowing the
    utility to amortize any of the relevant nuclear plant cancellation costs to rates and
    that his ability to advance this argument was not precluded by the doctrine of res
    judicata arising from the Commission’s earlier decision. 
    Id. at 467
    .
    ¶ 36         In holding that “the Commission’s treatment of cancellation costs in prior
    orders is not res judicata in this proceeding,” 
    id. at 471
    , we noted that,
    in addressing the issue of whether a Commission order can
    be deemed res judicata this Court has held that “only
    specific questions actually heard and finally determined by
    the Commission in its judicial character are res judicata,
    and then only as to the parties to the hearing.” Utilities
    Commission v. Area Development, Inc., 
    257 N.C. 560
    , 570,
    
    126 S.E.2d 325
    , 333 (1962) (emphasis added). Moreover,
    this Court has stated that ratemaking activities of the
    Commission are a legislative function. Utilities Comm. v.
    Edmisten, Attorney General, 
    294 N.C. 598
    , 603, 
    242 S.E.2d 862
    , 866 (1978); Utilities Commission v. General Telephone
    Company, 
    281 N.C. 318
    , 336, 
    189 S.E.2d 705
    , 717 (1972).
    It follows that[,] since the exercise of the Commission’s
    ratemaking power is a legislative rather than a judicial
    function, such orders are not governed by the principles of
    res judicata and are reviewable by this Court in later
    appeals of closely related matters.
    
    Id. at 468
    . After determining that the Commission had the authority to treat costs
    associated with the cancellation of the third nuclear unit at the Shearon Harris
    facility differently than it had treated the first two, we further held that the
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    Opinion of the Court
    Commission did “not err as a matter of law in authorizing [the utility] to continue to
    recover a portion of the cancellation costs of the abandoned Harris Plant as operating
    expenses through amortization” in light of its discretion “to consider all material facts
    in the record in determining rates” pursuant to N.C.G.S. § 62-133(d). Id. at 476.
    ¶ 37          Similarly, we held in State ex rel. Utils. Comm’n. v. Carolina Util. Customers
    Ass’n, that, while “prior decisions of this Court regarding general questions of law”
    relevant to the ratemaking process were entitled to stare decisis effect, “the final
    order of the Commission in a general rate case is not within the doctrine of stare
    decisis[.]” 
    348 N.C. 452
    , 472 (1998) (cleaned up) (quoting State ex rel. Util. Comm’n
    v. Carolina Power & Light Co., 
    250 N.C. 421
    , 430 (1959)). Thus, well-established
    principles of North Carolina law establish that prior Commission decisions, as
    compared to prior decisions of this Court, are not entitled to either res judicata or
    stare decisis effect. In light of that fact, we have no difficulty in holding that the
    Commission was not obligated to make the same decision with respect to the manner
    in which Dominion was entitled to reflect the costs associated with coal ash
    remediation in rates in this case that it made in the 2016 Dominion rate case or the
    2107 Duke rate cases.4
    4  As an aside, we note that the concept of stare decisis requires, in essence, that a
    court identify certain material differences between the case that is currently before the court
    and potentially-relevant precedent before declining to follow that precedent A requirement
    that the Commission explicitly distinguish prior precedent as a precondition for declining to
    follow it seems, aside from having no support of any nature in this Court’s precedent, to be
    STATE EX REL. UTILS. COMM’N V. VIRGINIA ELEC.
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    Opinion of the Court
    ¶ 38          In addition, we are unable to conclude that the Commission acted arbitrarily
    and capriciously in approving different ratemaking treatments for the coal ash-
    related costs at issue in this case as compared to those at issue in the 2016 Dominion
    general rate case and 2017 Duke general rate cases. Instead of indicating the absence
    “of fair and careful consideration or [the] fail[ure] to display a reasoned judgment,”
    Thornburg, 
    314 N.C. at 515
    , the Commission’s order in this case demonstrated a
    thorough consideration of the record evidence, adequately explained the reasons for
    the decision that the Commission did make, and reflected a ratemaking treatment of
    the relevant costs that failed to track the proposals made by either the utility or the
    Public Staff.
    ¶ 39          As evidence of its even-handed consideration of the matters at issue in this
    case, we note that the Commission’s order contains a detailed summary of the
    circumstances surrounding Dominion’s incurrence of the coal ash-related costs and
    inconsistent with the basic principle of North Carolina ratemaking law that prior
    Commission decisions do not have stare decisis effect. The decisions upon which Dominion
    relies in arguing for the imposition of such a requirement in this case, such as Nat’l Weather
    Serv. Employees Org. v. FLRA, 
    966 F.3d 875
     (D.C. Circ. 2020) (dispute over a termination
    provision in a collective bargaining agreement); New Eng. Power Generators Ass’n v. FERC,
    
    881 F.3d 202
     (D.C. Circ. 2018) (appellate review of a complaint alleging that an independent
    transmission system operator’s tariff was unreasonably discriminatory); West Deptford
    Energy, LLC v. FERC, 
    766 F.3d 10
     (D.C. Cir. 2014) (determination of which rate applied
    when more than one had been filed); Trump Plaza Assocs. v. NLRB, 
    679 F.3d 822
     (D.C. Cir.
    2012) (employer challenge to the certification of a union election); BB&L, Inc. v. NLRB, 
    52 F.3d 366
     (D.C. Cir. 1995) (employer refusal to bargain with a union), all appear to have been
    made in the context of adjudication proceedings conducted pursuant to the federal
    Administrative Procedure Act, 
    5 U.S.C. § 554
     (2022), rather than any sort of proceeding that
    is functionally equivalent to a general rate case conducted pursuant to N.C.G.S. § 62-133.
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    Opinion of the Court
    an explanation of the reasons that it had questions concerning the extent to which
    Dominion had acted prudently, which included the nature and extent of the
    exceedances associated with groundwater contaminants related to Dominion’s coal
    ash storage facilities, instances of late and deficient groundwater monitoring, and
    Dominion’s decision to ignore a recommendation for the construction of a dry waste
    disposal facility at a particular site. In addition, the Commission highlighted the
    risks inherent in certain of the decisions that Dominion had made with respect to the
    relevant coal ash-related costs, including the fact that, prior to enactment of the CCR
    Rule, Dominion had deemed unlined ponds to be a permanent storage solution for
    coal ash and had planned to close its existing wet storage facilities in place, an
    approach that would have allowed the continued leaching of coal combustion
    residuals into the groundwater.
    ¶ 40         Acknowledging that the record did not provide “substantial evidence” to
    support the making of a full and informed decision concerning the prudence of the
    manner in which the relevant coal ash-related costs had been incurred, the
    Commission concluded that “none of the CCR Costs incurred by the Company
    between July 1, 2016 through June 30, 2019 [would] be disallowed on the basis of
    having been imprudently incurred” and authorized Dominion to amortize all of those
    costs to rates. On the other hand, the Commission rejected Dominion’s request to be
    allowed to earn a return on the unamortized balance of the relevant coal ash-related
    STATE EX REL. UTILS. COMM’N V. VIRGINIA ELEC.
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    Opinion of the Court
    costs after considering multiple factors, such as the Commission’s “history of
    allocating prudently incurred costs, specifically in the context of extraordinary, large
    costs such as environmental clean-up and plant cancellation, between ratepayers and
    shareholders”; the evidence that called the prudence with which the relevant coal
    ash-related costs had been incurred into question; the “significant” costs that were at
    issue in this case, which would have resulted in material additions to the amount
    that each of Dominion’s North Carolina retail ratepayers would have had to pay had
    the company’s proposal been adopted; and a concern that approval of Dominion’s
    proposed treatment of the relevant costs would violate the “matching” principle and
    raise significant concerns for intergenerational equity.
    ¶ 41           As a result of the fact that the Commission’s findings of fact are “supported by
    competent, substantial evidence” and the fact that the basis for the Commission’s
    decision is adequately explained in its order and reflects an accurate understanding
    of North Carolina ratemaking law as set out in prior decisions from this Court, Stein,
    375 N.C. at 900, we have no legal basis for disturbing the Commission’s order in this
    case.    Although Dominion’s dissatisfaction with the Commission’s order is
    understandable, it has failed to show that the Commission’s decision lacks adequate
    record support, misapplies the applicable ratemaking statutes, or fails to embody a
    reasoned decision.    Instead, at the end of the day, Dominion’s challenge to the
    Commission’s order amounts to little more than a belief that the Commission should
    STATE EX REL. UTILS. COMM’N V. VIRGINIA ELEC.
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    Opinion of the Court
    have weighed the evidence differently and reached a different result and that we
    should intervene to require that a different outcome be reached in spite of the fact
    that “[t]he Commission is responsible for determining the weight and credibility to
    be afforded to the testimony of any witness, including any expert opinion testimony”
    and the fact that the Commission’s decision is “entitled to great deference.” Stein,
    375 N.C. at 900.
    ¶ 42         In addition, we note that, even if Dominion’s argument that the Commission
    was required to follow its earlier decisions in the 2016 Dominion rate case and the
    2017 Duke rates cases or to explain its reasons for failing to do so had merit, which
    it does not, the record contains ample support for any decision that the Commission
    might have made to refrain from doing so.           As we have already noted, the
    Commission’s order in the 2016 Dominion rate case rested upon a settlement between
    the parties, with both the stipulation itself and the resulting Commission order
    having made it abundantly clear that any decision that the Commission might make
    in that proceeding would not be deemed to have precedential effect, Application of
    Va. Elec. & Power Co., d/b/a Dominion N.C. Power, for Adjustment of Rates and
    Charges Applicable to Elec. Util. Serv. in N.C., Docket No. E-22, Sub 532, 2016 N.C.
    PUC LEXIS 1183, at *137–39 (N.C.U.C. Dec. 22, 2016), in light of the Commission’s
    statement that Dominion and the Public Staff had “agree[d] that the appropriate
    amortization period for future CCR expenditures shall be determined on a case-by-
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    Opinion of the Court
    case basis”; that there would be no “prejudice to the right of any party to take issue
    with the amount or the treatment of any deferral of ARO costs in a rate case or other
    appropriate proceeding”; that Dominion and the Public Staff “reserve[d] their rights
    in the Company’s next general rate case to argue . . . (a) how the unamortized balance
    of deferred CCR expenditures . . . should be addressed; and (b) how reasonable and
    prudent CCR expenditures incurred by the Company . . . should be recovered”; and
    that the Public Staff’s agreement to the stipulation should “not be construed as a
    recommendation that the Commission reach any conclusions regarding the prudence
    and reasonableness of the Company’s overall CCR plan.” Id. As a result, one of the
    decisions upon which Dominion relies in support of its “precedent-based” argument
    expressly disclaims any idea that precedent had actually been created.
    ¶ 43         Dominion’s reliance on the Commission’s orders in the 2017 Duke rate cases is
    equally misplaced.    Although the Commission did, to be sure, allow the Duke
    companies to amortize their coal ash-related costs to rates over a five-year period and
    to earn a return on the unamortized balance in their initial orders in these cases, the
    Commission also imposed substantial mismanagement penalties upon the Duke
    utilities that were not imposed upon Dominion in this case. In addition, the facts
    surrounding the manner in which Dominion and the Duke companies incurred their
    coal ash-related costs were, as is reflected in the relevant Commission orders,
    markedly different. Finally, the 2017 Duke rate orders were partially overturned on
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    Opinion of the Court
    appeal and remanded for further consideration by the Commission, eventually
    resulting in a settlement that reduced the amount of coal ash-related costs included
    in the rates charged by the Duke companies to their North Carolina retail ratepayers
    by “more than $900 million.” Under this set of circumstances, it is hard for us to see
    how the Commission’s refusal to explain why it failed to follow decisions that were,
    at the time, pending on appeal could possibly constitute prejudicial error. N.C.G.S. §
    62-94(c) (requiring reviewing courts to take due account of “the rule of prejudicial
    error”).5 As a result, the 2017 Duke rate orders that the Commission unlawfully, at
    least in Dominion’s eyes, failed to follow did not involve the same ratemaking
    treatment for which Dominion contends, rested upon differing sets of facts, and did
    not actually control the manner in which Duke’s coal ash-related costs were reflected
    in the companies’ rates.
    ¶ 44          As a result, given that the Commission’s ratemaking decisions involve the
    exercise of legislative authority and the fact that “only specific questions actually
    heard and finally determined by the Commission in its judicial character are res
    5 In our view, moreover, the Commission adequately discussed its reasons for failing
    to follow the prior Duke Energy orders by noting that they were on appeal at that time and
    by mentioning those orders no less than eight times in discussing the manner in which coal
    ash-related costs should be reflected in Dominion’s rates. In view of the fact that the
    Commission explained the reasons that it rejected Dominion’s position and referenced the
    Duke Energy orders multiple times, we have difficulty seeing what additional clarity would
    have been provided to the Commission’s order by the inclusion of language explicitly stating
    why it had not followed the result reached in the Duke Energy orders that were later
    overturned on appeal.
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    Opinion of the Court
    judicata, and then only as to the parties to the hearing,” Thornburg, 
    325 N.C. at 468
    ,
    we hold that the Commission did not err by focusing its analysis upon the nature and
    extent of the coal ash-related costs that Dominion sought to have included in the
    calculation of its North Carolina retail rates and that the Commission was not
    obligated to adopt the same ratemaking treatment for the costs at issue in this case
    that it adopted in the 2016 Dominion rate order and the 2017 Duke rate orders. For
    the same reason, the Commission did not violate the equal protection clauses of the
    state and federal constitutions by reaching a different result in this case than it did
    in the decisions upon which Dominion relies. Finally, we hold that the Commission
    adequately explained the basis for the decision that it actually made with respect to
    the issue of whether Dominion should have been allowed to earn a return upon the
    unamortized balance of the relevant coal ash-related costs. As a result, we hold that
    Dominion’s challenge to the Commission’s failure to allow it to earn a return on the
    unamortized balance of its coal ash-related costs did not involve any error of law.
    C. Ten-Year Amortization Period
    ¶ 45         Secondly, Dominion argues that the Commission’s determination that the coal
    ash-related costs at issue in this case should be amortized over ten years was
    arbitrary and capricious given that the Commission had determined in the 2016
    Dominion rate case that a five-year period would be beneficial for both Dominion and
    ratepayers and that the Commission had failed to give an adequate explanation for
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    Opinion of the Court
    its decision to use a ten-year, rather than a five-year, amortization period in this case.
    More specifically, Dominion argues that, “[w]hile it is true that the ten-year
    amortization period adopted by the Commission meets the outer bounds of the
    standard it adopted for cancelled nuclear plants,” “only a five-year amortization
    period would be consistent with the Commission’s treatment of coal ash costs and
    nuclear abandonment costs,” with the Commission having erred by failing to rely on
    more recent and applicable decisions “involving ‘identical’ coal ash costs” rather than
    earlier nuclear plant abandonment costs.
    ¶ 46         As we understand its brief, the logic upon which Dominion relies in asserting
    that the Commission erred by requiring the use of a ten-year, rather than a five-year,
    amortization period in this case is essentially identical to the logic upon which
    Dominion relied in arguing that the Commission erred by failing to permit it to earn
    a return on the unamortized balance of the relevant coal ash-related costs.            In
    essence, Dominion argues that, since the Commission found a five-year amortization
    period to be reasonable in both the 2016 Dominion rate case and the 2017 Duke
    Energy rate cases and since, “[i]n contrast to this line of precedent, the Commission
    now prescribes a ten-year amortization period” without “explain[ing] why [it]
    previously adopted [a] five-year amortization period, for the same costs,” the
    Commission’s decision with respect to the length of the applicable amortization period
    is arbitrary and capricious.
    STATE EX REL. UTILS. COMM’N V. VIRGINIA ELEC.
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    Opinion of the Court
    ¶ 47         The same logic that persuades us that the Commission did not err by declining
    to allow Dominion to earn a return on the unamortized balance of the company’s coal
    ash-related costs persuades us that the Commission did not err by approving the use
    of a ten-year, rather than a five-year, period for the amortization of those costs. In
    addition to the fact that the record developed in this case differs from those developed
    in the other cases, the fact that the 2016 Dominion order expressly stated that it was
    not entitled to precedential effect, and the fact that the ratemaking treatment
    approved in the 2017 Duke rate cases was changed upon remand from our decision
    in Stein, we note that the Commission found that the use of a ten-year period struck
    a “more appropriate and fairer balance” than the use of either a longer or a shorter
    amortization period and the use of a ten-year amortization period was consistent with
    its “historical treatment of major plant cancellations.” Application of Va. Elec. and
    Power Co. for Auth. to Adjust and Increase Its Elec. Rates and Charges, No. E-22, Sub
    273, 73 N.C.U.C. Orders & Decisions 343, 355. Although the record would have also
    supported a decision to reach the result which Dominion believes to be appropriate,
    the Commission’s choice of a ten-year, rather than a five-year, amortization period
    appears to have a reasonable basis in both the record and the Commission’s findings.
    As a result, we hold that the Commission did not commit any error of law in approving
    the use of a ten-year, rather than a five-year, period for amortizing Dominion’s coal
    ash-related costs.
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    Opinion of the Court
    III.    Conclusion
    ¶ 48         After a careful review of the entire record, we conclude that the Commission’s
    order is supported by competent, substantial evidence and that the Commission
    adequately explained the basis for the portions of its decision that Dominion has
    challenged on appeal. As a result, the Commission’s decision is affirmed.
    AFFIRMED.
    Justice BARRINGER dissenting.
    ¶ 49         The issue I address today is whether the Utilities Commission needed to
    explain why it departed from its reasoning in two cases that were decided less than
    two years prior, had materially similar facts, and were brought to the Commission’s
    attention. While I agree with much of the majority’s discussion of this case, I cannot
    accept its holding that the Commission did not even need to acknowledge the two
    Duke Energy (Duke) cases relied upon by Dominion Energy (Dominion) when
    Dominion requested a rate increase. Under general tenets of administrative law, an
    agency’s failure to explain a departure from recent, applicable past decisions when
    they were brought to its attention is arbitrary and capricious. North Carolina
    administrative law should be no different. Otherwise, an agency can treat two
    similarly situated entities differently without having to directly explain why. Such
    arbitrary and capricious decision-making will only serve to undermine trust in our
    government. The matter should be remanded to address the issue discussed herein.
    Accordingly, I respectfully dissent.
    I.      Relevant Facts
    ¶ 50         On 29 March 2019, Dominion Energy applied to the Commission for a general
    rate increase. Application of Va. Elec. & Power Co., d/b/a Dominion Energy N.C. for
    Adjustment of Rates and Charges Applicable to Elec. Serv. in N.C., Docket No. E-22,
    STATE EX REL. UTILS. COMM’N V. VIRGINIA ELEC.
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    Barringer, J., dissenting
    Sub 562 & Sub 566, slip op. at 3 (N.C.U.C. Feb. 24, 2020).1 As part of the rate increase,
    Dominion sought to recover CCR compliance expenses incurred from 1 July 2016 to
    30 June 2019 through a five-year amortization period as well as a return on the
    unamortized balance. Id. at 86. Dominion requested this recovery method as the
    Commission had allowed it in three prior decisions, one involving Dominion in 2016
    and two involving Duke in 2018. The Commission, however, denied Dominion’s
    request, instead allowing it a ten-year amortization period and no return on the
    unamortized balance. Id. at 15. As the Public Staff concedes, at no point in the order
    did the Commission explain what distinguished Dominion’s case from the two Duke
    cases, even though both had materially similar facts.
    II.     Analysis
    ¶ 51         Dominion Energy contends that the Commission’s failure to provide any
    explanation directly addressing why it did not allow Dominion the same recovery as
    Duke was arbitrary and capricious. In response, the Public Staff argues that while
    “the Commission did not expressly distinguish those orders . . . the Commission’s
    extensive explanation” for why it did not allow Dominion Energy a five-year
    amortization period and a return on coal costs “provided an adequate explanation for
    why it broke with the different policy that it had adopted in the 2018 Duke orders.”
    1 Currently available at: https://starw1.ncuc.gov/NCUC/ViewFile.aspx?Id=7c1dc9e1-
    1bdb-4840-8692-6b329c980225.
    STATE EX REL. UTILS. COMM’N V. VIRGINIA ELEC.
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    Barringer, J., dissenting
    Additionally, the Public Staff contends that even if the Commission erred by failing
    to expressly distinguish the Duke cases, remand would serve no purpose since this
    Court reversed the Duke orders in State ex rel. Utilities Commission v. Stein, 
    375 N.C. 870
     (2020).
    ¶ 52         The Commission does not have “unbridled discretion in exercising its
    judgment.” State ex rel. Utils. Comm’n v. Thornburg, 
    314 N.C. 509
    , 516 (1985).
    Instead, this Court may reverse a decision of the Commission if it is arbitrary or
    capricious. N.C.G.S. § 62-94(b)(6) (2021). “To be arbitrary and capricious, the
    Commission’s order would have to show a lack of fair and careful consideration of the
    evidence or fail to display a reasoned judgment.” State ex rel. Utils. Comm’n v.
    Piedmont Nat. Gas Co., 
    346 N.C. 558
    , 573 (1997).
    ¶ 53         After careful review, I cannot find a case where this Court has addressed
    whether or not the Commission must explicitly explain why it departed from a
    recently decided case with materially similar facts that was brought to its attention.
    However, this Court has previously recognized that “[w]hile the Commission is not
    covered by our Administrative Procedure Act[,] . . . the Commission is still an
    administrative agency of the state government, and general tenets of administrative
    law are applicable to its operation except where modified by statute.” State ex rel.
    Utils. Comm’n v. Nantahala Power & Light Co., 
    326 N.C. 190
    , 199–200 (1990).
    Looking to the general tenets of administrative law, “[i]t is textbook administrative
    STATE EX REL. UTILS. COMM’N V. VIRGINIA ELEC.
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    Barringer, J., dissenting
    law that an agency must provide[ ] a reasoned explanation for departing from
    precedent or treating similar situations differently.” New England Power Generators
    Ass’n, Inc. v. Fed. Energy Regul. Comm’n, 
    881 F.3d 202
    , 210 (D.C. Cir. 2018) (second
    alteration in original) (quoting W. Deptford Energy LLC v. FERC, 
    766 F.3d 10
    , 20
    (D.C. Cir. 2014)); Trump Plaza Assocs. v. NLRB, 
    679 F.3d 822
    , 827 (D.C. Cir. 2012)
    (noting that an agency “cannot ‘ignore its own relevant precedent but must explain
    why it is not controlling[,]’ B B & L, Inc. v. NLRB, 
    52 F.3d 366
    , 369 (D.C. Cir. 1995)”);
    see also 2 Am. Jur. 2d Admin. Law § 360 (2022).2 Accordingly, though an
    administrative agency “need not address every precedent brought to its attention, it
    must provide an explanation where its decisions appear to be ‘on point.’ ” Nat’l
    Weather Serv. Emps. Org. v. Fed. Lab. Rels. Auth., 
    966 F.3d 875
    , 883–84 (D.C. Cir.
    2020) (quoting Brusco Tug & Barge Co. v. NLRB, 
    247 F.3d 273
    , 277 (D.C. Cir. 2001)).
    ¶ 54          Here, the Commission never explained why, in this case, it allowed a different
    recovery for Dominion’s CCR costs than the recovery it allowed for Duke’s CCR costs
    2 While these decisions are not from this Court, they interpret the words “arbitrary”
    and “capricious” in the context of administrative law, specifically the federal Administrative
    Procedure Act (APA). Like N.C.G.S. § 62-94(b)(6), the APA instructs federal courts to reverse
    agency actions that are arbitrary and capricious. Compare 
    5 U.S.C. § 706
    (2)(A), with N.C.G.S.
    § 62-94(b)(6) (2021). While the cases are not binding, given the similar statutory language
    and context, their interpretation is persuasive. See, e.g., Reynolds Am. Inc. v. Third Motion
    Equities Master Fund Ltd, 
    379 N.C. 524
    , 2021-NCSC-162, ¶ 7 (“[G]iven the well-developed
    body of law arising from the numerous appraisal cases decided in Delaware, we borrow freely
    from these cases to the extent we find their reasoning to be persuasive and applicable to the
    facts here.”).
    STATE EX REL. UTILS. COMM’N V. VIRGINIA ELEC.
    2022-NCSC-75
    Barringer, J., dissenting
    two years prior.3 In the Duke cases, the Commission allowed Duke to recover its CCR
    costs through a five-year amortization period and receive a return on the unamortized
    costs. In contrast, in this case, the Commission only allowed Dominion to recover its
    CCR costs through a ten-year amortization period and not receive a return on the
    unamortized costs. The Commission’s order in this case contained several reasons
    explaining why it allowed a ten-year amortization period with no return on the
    unamortized costs. However, none of those reasons relate to the Duke cases or explain
    why the Commission departed from the Duke cases.4
    3  In contrast, the Commission explicitly explained why it allowed a different recovery
    in this case than in the 2016 Dominion case. Application of Va. Elec. & Power Co., d/b/a
    Dominion Energy N.C. for Adjustment of Rates and Charges Applicable to Elec. Serv. in N.C.,
    Docket No. E-22, Sub 562 & Sub 566, slip op. at 122–23 (N.C.U.C. Feb. 24, 2020). Specifically,
    the Commission noted that the 2016 case did “not have precedential value” and that the
    evidence presented in the 2016 case was “far less extensive” than the evidence in this case.
    
    Id.
    4 The order only mentions the Duke cases in two sections. First, in its findings of fact,
    the Commission found that “Duke Energy Carolinas, LLC (DEC), and Duke Energy Progress,
    LLC (DEP)” have an “authorized rate of return on common equity” of “9.90%.” 
    Id.
     at 8–9. The
    Commission then included a citation for the two 2018 Duke cases. 
    Id.
     at 9 n.3. As part of the
    citation, the Commission included the subsequent history of the Duke cases in accordance
    with Bluebook rule 10.7.1(a). See The Bluebook: A Uniform System of Citation R. 10.7.1(a),
    at 110 (Columbia L. Rev. Ass’n et al. eds., 21st ed. 2020). In other words, within the citation
    to the DEC case, the Commission properly included the clause “appeal docketed, No. 401A18
    (N.C. Nov. 7, 2018),” and within the citation to the DEP case the Commission properly
    included the clause “appeal docketed, No. 401A18 (N.C. Nov. 7, 2018)” which were required
    by Bluebook Rule 10.7.1(a) because the cases were on appeal at that time. Application of Va.
    Elec. & Power Co., slip op. at 9. These citation clauses are the only mention of the Duke cases
    being on appeal in the entire order. Therefore, it cannot seriously be maintained that these
    two clauses, in a citation, in a footnote, constitute adequate discussion of the Commission’s
    reasons for failing to follow the prior Duke Energy orders. The cases were cited for the
    authorized rate of return on common equity allowed Duke Energy, not to explain why the
    Commission did not follow their treatment of CCR costs. At best, the mention of the appeals
    in the citations represents admirable attention to the Bluebook by the Commission.
    STATE EX REL. UTILS. COMM’N V. VIRGINIA ELEC.
    2022-NCSC-75
    Barringer, J., dissenting
    ¶ 55          Since ratemaking is a legislative function and traditional principles of stare
    decisis do not apply, it was permissible for the Commission to allow a different
    recovery method in this case than in the Duke cases. However, when departing from
    the Duke cases, under general tenets of administrative law, the Commission needed
    to provide some explanation directly addressing why it departed when the Duke cases
    were similar, recently decided, and brought to the Commission’s attention.5 The
    Commission’s failure to provide that explanation rendered its order arbitrary and
    capricious.
    ¶ 56          Further, contrary to the Public Staff’s contention, reversing this case for the
    Commission to correct its erroneous reasoning would not be “futile.” According to the
    Second, the Commission provided “a summary of the evidence that is in the record,”
    which included the opposing arguments of the Public Staff and Dominion’s witnesses
    concerning how the Commission should apply the Duke cases. 
    Id.
     at 85–86, 99, 105–06, 114–
    15, 117. In its analysis, the Commission also referenced some exhibits that appeared in the
    Duke cases, 
    id.
     at 124 & n.22, 127–29, and recognized that Dominion claimed it was entitled
    to a return on CCR costs because of the Duke cases, id. at 133. However, the order never
    actually addressed which of the arguments concerning the Duke cases the Commission found
    persuasive or explained why the Commission chose not to follow the Duke cases. Id. at 121–
    44. Thus, on appeal, this Court can only speculate as to why the Commission declined to
    follow the Duke cases.
    5 Notably, in each of the 2018 Duke cases, the Commission explicitly discussed the
    2016 Dominion case when explaining why it allowed the Duke utilities to recover their CCR
    costs through a five-year amortization period with a return on the unamortized costs. See In
    re Joint Application by Duke Energy Progress, LLC, and Duke Energy Carolinas, LLC, for
    Accounting Order to Defer Environmental Compliance Costs, Docket No. E-2, Sub 1103, 2018
    N.C. PUC LEXIS 105, at *499–501 (N.C.U.C. Feb. 23, 2018); In the Matter of Joint
    Application by Duke Energy Progress, LLC, and Duke Energy Carolinas, LLC, for Accounting
    Order to Defer Environmental Compliance Costs, Docket No. E-7, SUB 1110, 
    2018 WL 3209374
    , at *264 (N.C.U.C. June 22, 2018).
    STATE EX REL. UTILS. COMM’N V. VIRGINIA ELEC.
    2022-NCSC-75
    Barringer, J., dissenting
    Public Staff, since Stein reversed the two Duke cases, “there is now no need for the
    Commission to distinguish the ratemaking treatment that it afforded Duke that was
    later reversed and superseded.” However, this argument only highlights the problem
    with the Commission’s decision in this case. Without an explanation from the
    Commission, this Court has no basis for knowing why the Commission chose not to
    follow the Duke cases. Thus, this Court can only speculate as to what effect Stein
    would have on the Commission’s reasoning in this case.
    ¶ 57         More importantly, at the time the Commission decided this case, Stein had not
    yet been decided by this Court. Thus, the Commission must have chosen to depart
    from the Duke cases for some reason other than Stein. Accordingly, the partial
    reversal of the Duke cases in Stein and their ultimate settlement does not provide
    this Court with any further insight as to why the Commission chose not to follow
    them or permit us to conclude that its decision to depart from the Duke cases was not
    arbitrary and capricious.
    ¶ 58         Ultimately, the lack of an explanation by the Commission is the fatal flaw in
    this case. While nonarbitrary explanations for why the Commission treated one
    utility differently than another utility certainly could exist,6 so could arbitrary ones.
    6 For instance, the majority notes that the Duke utilities were assessed substantial
    mismanagement penalties in the 2018 cases while Dominion incurred no such penalty in this
    case. Again, however, this Court has no way to determine whether the mismanagement
    penalty was a factor in the Commission’s decision to depart from the Duke cases. After all,
    the substantial mismanagement penalty referenced by the majority escaped the attention of
    STATE EX REL. UTILS. COMM’N V. VIRGINIA ELEC.
    2022-NCSC-75
    Barringer, J., dissenting
    For instance, the Commission might arbitrarily treat out-of-state-based utilities
    differently than locally based ones due to a bias towards local businesses. Unless the
    Commission had to directly explain why it treated two similarly situated utilities
    differently, it could hide biased, arbitrary decision-making through the release of
    reasonable but unrelated explanations in each case. The risk that some businesses
    will be treated differently than others, without a guarantee that they will receive an
    explanation as to why they are treated differently, will only undermine trust in our
    government and prevent us from reviewing the Commission’s decisions to ensure they
    are not arbitrary and capricious. See, e.g., State ex rel. Utilities Comm’n v. Stein, 
    375 N.C. 870
     (2020) (Newby, J., concurring in part and dissenting in part); In re Harris
    Teeter, LLC, 
    378 N.C. 108
    , 2021-NCSC-80 (Berger, J., dissenting); 
    id.
     (Barringer, J.,
    dissenting). General tenets of administrative law would not permit such a situation,
    but apparently, the majority is willing to adopt a different standard, a standard that
    will now govern all utilities who wish to conduct business in North Carolina.
    III.    Conclusion
    ¶ 59          An agency’s decision is arbitrary and capricious if it does not explain why it
    decided to depart from two cases decided less than two years prior that featured
    materially similar facts and were brought to its attention. The majority’s decision to
    the Public Staff who, on appeal, did not suggest it as a possible reason for distinguishing the
    Duke cases from the present case.
    STATE EX REL. UTILS. COMM’N V. VIRGINIA ELEC.
    2022-NCSC-75
    Barringer, J., dissenting
    the contrary now permits the Commission to treat two similarly situated entities
    differently without ever having to directly address the reason for the disparate
    treatment. The majority’s decision on this point contradicts general tenets of
    administrative law. Because this case should be remanded to the Commission to
    address the issue discussed herein, I respectfully dissent.
    Chief Justice NEWBY and Justice BERGER join in this dissenting opinion.