In re Application of Northeast Neb. Pub. Power Dist. , 300 Neb. 237 ( 2018 )


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    IN RE APPLICATION OF NORTHEAST NEB. PUB. POWER DIST.
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    In   re   A pplication of Northeast Neb. Pub. Power Dist.
    Northeast Nebraska Public Power District
    et al., appellants, v. Nebraska P ublic
    Power District, appellee.
    ___ N.W.2d ___
    Filed June 15, 2018.    No. S-17-529.
    1.	 Nebraska Power Review Board: Arbitration and Award: Appeal and
    Error. On an appeal from the decision of an arbitration board convened
    under Neb. Rev. Stat. § 70-1301 et seq. (Reissue 2009), trial in the
    appellate court is de novo on the record.
    2.	 Nebraska Power Review Board: Arbitration and Award: Evidence:
    Appeal and Error. Despite de novo review, when credible evidence is
    in conflict on material issues of fact, the appellate court will consider
    and may give weight to the fact that the arbitration board under Neb.
    Rev. Stat. § 70-1301 et seq. (Reissue 2009) observed the witnesses and
    accepted one version of the facts over another.
    3.	 Jurisdiction: Appeal and Error. Before reaching the legal issues
    presented for review, it is the duty of an appellate court to determine
    whether it has jurisdiction over the matter before it.
    4.	 ____: ____. An appellate court has an independent duty to decide juris-
    dictional issues on appeal, even if the parties have not raised the issue.
    5.	 Jurisdiction: Words and Phrases. Subject matter jurisdiction is the
    power of a tribunal to hear and determine a case in the general class or
    category to which the proceedings in question belong and to deal with
    the general subject matter involved.
    6.	 Jurisdiction. A lack of subject matter jurisdiction may be raised at any
    time by any party or by the court sua sponte.
    7.	 Jurisdiction: Appeal and Error. When a trial court lacks the power,
    that is, jurisdiction, to adjudicate the merits of a claim, an appellate
    court also lacks the power to adjudicate the merits of the claim.
    8.	 Arbitration and Award: Jurisdiction: Statutes. An arbitration board
    under Neb. Rev. Stat. § 70-1301 et seq. (Reissue 2009), as a creature
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    of statute, has only such authority as has been conferred upon it
    by statute.
    9.	 Statutes: Legislature: Intent. Components of a series or collection of
    statutes pertaining to a certain subject matter are in pari materia and
    should be conjunctively considered and construed to determine the
    intent of the Legislature, so that different provisions are consistent, har-
    monious, and sensible.
    10.	 Public Utilities. Persons receiving similar service from a public power
    district under similar circumstances cannot be charged for such service
    in an arbitrary, designed, dissimilar manner.
    11.	 Contracts: Parties. The implied covenant of good faith and fair dealing
    exists in every contract and requires that none of the parties to the con-
    tract do anything which will injure the right of another party to receive
    the benefit of the contract.
    12.	 ____: ____. The nature and extent of an implied covenant of good faith
    and fair dealing are measured in a particular contract by the justifiable
    expectations of the parties. Where one party acts arbitrarily, capriciously,
    or unreasonably, that conduct exceeds the justifiable expectations of the
    second party.
    13.	 ____: ____. A violation of the covenant of good faith and fair dealing
    occurs only when a party violates, nullifies, or significantly impairs any
    benefit of the contract.
    Appeal from the Power Review Board. Affirmed.
    Steven D. Davidson and David C. Levy, of Baird Holm,
    L.L.P., for appellants.
    Kile Johnson and Corey Wasserburger, of Johnson, Flodman,
    Guenzel & Widger, and John C. McClure, of Nebraska Public
    Power District, for appellee.
    Heavican, C.J., Cassel, Stacy, and Funke, JJ., and Steinke,
    District Judge.
    Cassel, J.
    I. INTRODUCTION
    This is our first opinion addressing an appeal from an
    arbitration board’s decision under Neb. Rev. Stat. §§ 70-1301
    to 70-1329 (Reissue 2009). After Nebraska Public Power
    District (NPPD) provided a discount to wholesale customers
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    who renewed their contractual relationship, some nonrenewing
    customers initiated statutory arbitration. They alleged that the
    discount was discriminatory and an abuse of NPPD’s statu-
    tory rate-setting authority,1 but the arbitration board disagreed.
    Upon our de novo review, we conclude that the discount was
    reasonable and not arbitrary and that it did not breach the con-
    tract or the covenant of good faith. Accordingly, we affirm the
    arbitration board’s decision.
    II. BACKGROUND
    1. Overview of Wholesale
    R ate Dispute Process
    Nebraska’s public policy is to “provide adequate electrical
    service at as low overall cost as possible, consistent with sound
    business practices.”2 To further that policy, “electric serv­
    ice should be provided by nonprofit entities including public
    power districts, public power and irrigation districts, nonprofit
    electric cooperatives, and municipalities.”3 Public power dis-
    tricts are required by law to fix rates which are fair, reasonable,
    and nondiscriminatory.4
    In 1979, the Legislature enacted §§ 70-1301 to 70-13295
    to provide a method to quickly and fairly resolve wholesale
    electric rate disputes.6 If a wholesale purchaser elects to dis-
    pute a portion of the wholesale electric charge established by
    a supplier7 and the dispute remains unresolved 45 days after
    the supplier receives written notice of the dispute, the dispute
    shall be submitted to arbitration.8 The arbitration board is
    1
    See Neb. Rev. Stat. § 70-655(1) (Cum. Supp. 2016).
    2
    § 70-1301.
    3
    Id.
    4
    See §§ 70-655(1) and 70-1302.
    5
    See 1979 Neb. Laws, L.B. 207.
    6
    See § 70-1302.
    7
    See § 70-1304.
    8
    See § 70-1306.
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    composed of three members: one selected by the purchaser,
    one selected by the supplier, and a third selected by the other
    two arbitrators.9 At a hearing, the arbitration board hears tes-
    timony and receives evidence relating to the dispute.10 Within
    30 days after completion of the hearing, the arbitration board
    shall render a written decision.11 And within 5 days of the date
    of the decision, the arbitration board shall file the decision
    along with all the pleadings and exhibits with the secretary of
    the Nebraska Power Review Board.12
    A party who is unsatisfied with the arbitration board’s deci-
    sion may appeal to reverse, vacate, or modify the decision.13 To
    do so, the party must file a notice of appeal with the Nebraska
    Power Review Board within 30 days after the arbitration
    board’s decision is filed with the Nebraska Power Review
    Board.14 “Trial in the appellate court shall be de novo on the
    record.”15 As noted, this is our first such decision concerning
    such an appeal from the arbitration board. We now turn to the
    facts of the case.
    2. Contracts
    NPPD, a public power district, derives the majority of its
    revenue from wholesale power supply contracts with politi-
    cal subdivisions in Nebraska. These wholesale power supply
    contracts often are the largest single financial obligation of the
    purchasing political subdivision.
    The appellants (hereinafter purchasers) are political sub-
    divisions engaged in the distribution of electricity to retail
    electric customers. They are wholesale customers of NPPD.
    9
    See § 70-1307.
    10
    See § 70-1318.
    11
    See § 70-1320.
    12
    See § 70-1321.
    13
    See § 70-1325.
    14
    See § 70-1326.
    15
    § 70-1327.
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    Purchasers are parties to NPPD’s 2002 wholesale power con-
    tract (2002 WPC).
    The 2002 WPC included a 20-year term beginning on
    January 1, 2002. After December 31, 2021, the 2002 WPC
    would automatically renew from year to year unless terminated
    with 5 years’ notice by either party.
    The 2002 WPC obligated wholesale customers to purchase
    their full energy requirements from NPPD for the first 6 years
    of the contract. After that point, a wholesale customer could
    limit or reduce its purchases of demand and energy from NPPD
    in varying amounts depending on the length of advance notice
    provided to NPPD. To limit purchases meant that a customer
    could continue to buy power in the same amount as on the date
    of its notice to NPPD, but that it would not buy any future
    growth in its electricity from NPPD going forward. To reduce
    purchases meant that the customer could purchase less than its
    full requirements from NPPD. The 2002 WPC imposed no fee
    or rate increase in exchange for the privilege to limit or reduce
    purchases. Each purchaser had given, or intended to give,
    notice to NPPD of its intention to limit or reduce its purchases,
    which reductions would commence at various times on and
    after January 1, 2017.
    The 2002 WPC listed different types of costs that NPPD
    was authorized to include in its revenue requirement for rate-
    setting purposes. One such cost was “amounts reasonably
    required to be set aside in reserves for items of costs the
    payment of which is not immediately required, such as . . .
    post-retirement employee benefit reserves.” Thus, the 2002
    WPC allowed NPPD to include in its revenue requirements a
    reasonable amount to be set aside for other postemployment
    benefits (OPEB). OPEB are benefits promised to employees
    once they retire. They are unfunded liabilities associated with
    past service.
    In 2009, NPPD formed a contract strategy team to look at
    options for extension of the 2002-era contracts. NPPD desired
    more certainty in its revenue stream than that provided by
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    the 2002 WPC. And NPPD believed that the provisions of
    the 2002 WPC permitting customers to limit or reduce their
    purchases would allow some customers to economically disad-
    vantage others.
    In 2013, NPPD initiated negotiations to replace the 2002
    WPC with a new standard wholesale contract. The negotiations
    resulted in a 20-year contract beginning on January 1, 2016,
    and ending on December 31, 2035 (2016 WPC). A customer
    under the 2016 WPC could not limit or reduce its purchases
    unless NPPD failed to meet certain performance standards.
    NPPD decided to charge extending and nonextending custom-
    ers the same general firm power service rate. But as an incen-
    tive to get customers to execute a new contract, NPPD created
    a discount for renewing customers. Thus, the 2016 WPC pro-
    vides a rate discount through December 31, 2021, at an amount
    to be approved by the NPPD board of directors. Purchasers did
    not execute the 2016 WPC.
    3. Funding OPEB Obligation
    Prior to 2007, NPPD funded its OPEB obligation on a
    “pay-as-you-go” basis. In 2007, the Governmental Accounting
    Standards Board implemented Governmental Accounting
    Standards Board Statement No. 45. This statement required
    NPPD to use actuaries to calculate and identify its unfunded
    OPEB liability and include those amounts in notes to its finan-
    cial statements. It allowed NPPD to amortize the unfunded
    OPEB liability over a period up to 30 years. The statement
    also introduced the concept of the annual required contribution,
    which is the theoretical amount, if contributed consistently
    each year, that would fully prefund future retiree benefits asso-
    ciated with benefits earned for past service.
    NPPD then explored its options for accounting and report-
    ing of OPEB. One was continuation of “pay-as-you-go.” This
    had the lowest impact on rates. However, because of a per-
    ception that NPPD was not addressing the liability, it had the
    potential for a negative response from rating agencies and the
    investment community. Another option was to put the annual
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    required contribution into 1 year’s rates. That would mean add-
    ing approximately $36 million as a revenue requirement in the
    rate-setting process and collecting the full sum from customers
    in rates within a 1-year period. A third option was to borrow
    money toward the OPEB liability. NPPD could borrow money,
    and the debt service from the borrowing would be added into
    the revenue requirements used to set rates.
    At that point, NPPD adopted a plan to obtain additional
    funding in rates. Under the plan, NPPD would continue on
    the pay-as-you-go basis for 2007. Through rates, NPPD would
    collect $4 million over the pay-as-you-go amount between
    2008 and 2013, and then $10 million above the pay-as-you-
    go amount thereafter. The money would fund an OPEB trust,
    which was projected to be fully funded by 2033.
    By 2011, actuarial studies showed that NPPD would need to
    contribute more in order to have the liability funded by 2033.
    NPPD decided to accelerate the collection of the OPEB liabil-
    ity to the 6-year term remaining in the 2002 WPC. Otherwise,
    based on purchasers’ notifications of reductions, purchasers
    would be able to avoid 40 percent of their pro rata share of the
    OPEB obligation. NPPD estimated the liability to be $155 mil-
    lion. To collect that amount over 6 years, NPPD increased the
    annual budgeted contribution to the OPEB trust by $25 million.
    NPPD referred to it as a “catch-up.”
    The Governmental Accounting Standards Board also cre-
    ated Governmental Accounting Standards Board Statement
    No. 75, which became effective for fiscal years ending after
    June 2017. This statement no longer permitted disclosure of
    OPEB in notes to the financial statements; it required enti-
    ties such as NPPD to recognize the entire OPEB as a “hard”
    liability on its balance sheet. Because the statement recom-
    mended early implementation, NPPD chose to do so for the
    2016 year end.
    4. 2016 and 2017 R ates
    The inclusion of the $25 million in OPEB catch-up expense
    resulted in a 3.7-percent increase for 2016 rates. Wholesale
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    customers who elected to sign the 2016 WPC received a
    3.57-percent discount on the rate in 2016. The 2017 rate
    similarly included $25 million for accelerated funding of
    the OPEB trust and a discount for customers who signed the
    2016 WPC.
    5. Complaint
    Purchasers filed a complaint against NPPD before the arbi-
    tration board. They alleged that NPPD violated § 70-655(1),
    claiming that the 2016 rate was discriminatory. Purchasers
    alleged that the 2016 rate was formulated and implemented
    in breach of the 2002 WPC. They further claimed that NPPD
    breached the implied covenant of good faith and fair dealing
    by charging them a different rate. They sought declaratory
    relief and damages. Purchasers later filed an amended com-
    plaint to challenge the 2017 rate on similar grounds.
    At a hearing, the arbitration board received extensive evi-
    dence. We will discuss the evidence in more detail in the analy-
    sis section of the opinion.
    6. A rbitration Board’s Decision
    The arbitration board determined that the 2016 and 2017
    rates were reasonable. It stated that the OPEB catch-up
    amounts were reasonable, because they related to the value of
    the service rendered to purchasers during their years of tak-
    ing service from NPPD. It further stated that NPPD did not
    arbitrarily select the amounts to include in the catch-up, but,
    rather, those amounts were “the product of a systematic study
    of the actuarial liability of OPEB attributable to production-
    level services.”
    The arbitration board also determined that the 2016 and
    2017 rates were nondiscriminatory. It reasoned that the dis-
    count merely deferred the collection of the 2016 and 2017
    catch-up amounts for customers under the 2016 WPC. The
    board explained:
    Customers under the 2002 WPC and the 2016 WPC
    are taking the same service from NPPD and charged
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    the same rate. The customers operate under two sepa-
    rate and differing contracts, fairly negotiated. The 2016
    customers gave up some rights they had under the 2002
    WPC and accepted new terms including the deferred
    collection of the OPEB Catch-Up amounts included
    in the 2016 and 2017 rates. Customers under the 2016
    WPC have over 18 years left in their comm[i]tment to
    NPPD, whereas [purchasers] have just over 4 years. This
    differentiated approach is fair and reasonable as relat-
    ing to the collection of a liability that solely relates to
    past services.
    Finally, the board determined that NPPD did not breach the
    2002 WPC or the covenant of good faith and fair dealing. The
    board therefore denied all of purchasers’ requests and deter-
    mined that the 2016 and 2017 rates met the standards estab-
    lished by § 70-655(1).
    Purchasers appealed, and we granted their petition to bypass
    review by the Nebraska Court of Appeals.
    III. ASSIGNMENTS OF ERROR
    Purchasers assign that the arbitration board erred in (1) fail-
    ing to find NPPD’s 2016 and 2017 wholesale rate structure
    violated § 70-655(1), (2) failing to find NPPD’s 2016 and 2017
    wholesale rate structure breached the 2002 WPC, and (3) fail-
    ing to find NPPD violated the duty of good faith and fair deal-
    ing under the 2002 WPC.
    IV. STANDARD OF REVIEW
    [1,2] On an appeal from the decision of an arbitration board
    convened under § 70-1301 et seq., trial in the appellate court is
    de novo on the record.16 Despite de novo review, when credible
    evidence is in conflict on material issues of fact, the appellate
    court will consider and may give weight to the fact that the
    trial court observed the witnesses and accepted one version of
    16
    § 70-1327.
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    the facts over another.17 We apply this same rule in an appeal
    from an arbitration board under this statutory scheme.
    V. ANALYSIS
    1. Jurisdiction
    [3,4] Before reaching the legal issues presented for review,
    it is the duty of an appellate court to determine whether it has
    jurisdiction over the matter before it.18 Neither party challenges
    the arbitration board’s jurisdiction to decide the matters pre-
    sented to it. But an appellate court has an independent duty to
    decide jurisdictional issues on appeal, even if the parties have
    not raised the issue.19
    [5-7] Subject matter jurisdiction is the power of a tribunal
    to hear and determine a case in the general class or category
    to which the proceedings in question belong and to deal with
    the general subject matter involved.20 A lack of subject matter
    jurisdiction may be raised at any time by any party or by the
    court sua sponte.21 When a trial court lacks the power, that
    is, jurisdiction, to adjudicate the merits of a claim, an appel-
    late court also lacks the power to adjudicate the merits of
    the claim.22 We begin by considering whether the arbitration
    board had subject matter jurisdiction over the issues presented
    to it.
    The parties presented three issues to the arbitration board,
    and those same three issues are before us on appeal. The issues
    17
    See Mock v. Neumeister, 
    296 Neb. 376
    , 
    892 N.W.2d 569
    (2017). See,
    also, In re Interest of Steven S., 
    299 Neb. 447
    , 
    908 N.W.2d 391
    (2018);
    Erin W. v. Charissa W., 
    297 Neb. 143
    , 
    897 N.W.2d 858
    (2017); Strohmyer
    v. Papillion Family Medicine, 
    296 Neb. 884
    , 
    896 N.W.2d 612
    (2017);
    Lingenfelter v. Lower Elkhorn NRD, 
    294 Neb. 46
    , 
    881 N.W.2d 892
    (2016).
    18
    Boyd v. Cook, 
    298 Neb. 819
    , 
    906 N.W.2d 31
    (2018).
    19
    Davis v. State, 
    297 Neb. 955
    , 
    902 N.W.2d 165
    (2017).
    20
    Boyd v. Cook, supra note 18.
    21
    
    Id. 22 Cappel
    v. State, 
    298 Neb. 445
    , 
    905 N.W.2d 38
    (2017).
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    concern the validity of NPPD’s rate structure, whether NPPD
    breached its contract with purchasers, and whether NPPD
    breached the covenant of good faith and fair dealing. Because
    this case was brought under § 70-1301 et seq., we must deter-
    mine whether the arbitration board had subject matter jurisdic-
    tion over all of the issues.
    [8] The arbitration board, as a creature of statute, has only
    such authority as has been conferred upon it by statute.23
    Statutes have clearly empowered an arbitration board to deter-
    mine a wholesale electric rate dispute.24 But it is less clear
    whether the arbitration board also has jurisdiction over the
    contractual issues presented in this case.
    [9] Reading the statutes in §§ 70-1301 to 70-1329 as a
    whole leads us to conclude that the arbitration board’s juris-
    diction is not limited to deciding a dispute over the establish-
    ment of a wholesale rate. Components of a series or collection
    of statutes pertaining to a certain subject matter are in pari
    materia and should be conjunctively considered and construed
    to determine the intent of the Legislature, so that different
    provisions are consistent, harmonious, and sensible.25 One
    section empowers the board to resolve not just wholesale rate
    disputes but also “rate disputes relating to transmission and
    delivery of electrical energy.”26 A dispute may address “all or
    any portion of the wholesale electric charge.”27 The dispute
    could concern a “mathematical, metering, or quantity error
    in the billing.”28 And that the arbitration board may consider
    more than merely the wholesale rate to be charged is implicit
    in the Legislature’s directive that the parties meet with the
    23
    See, generally, Interiano-Lopez v. Tyson Fresh Meats, 
    294 Neb. 586
    , 
    883 N.W.2d 676
    (2016).
    24
    See, e.g., §§ 70-1302, 70-1304, 70-1306, and 70-1307.
    25
    In re Trust of Shire, 
    299 Neb. 25
    , 
    907 N.W.2d 263
    (2018).
    26
    § 70-1302.
    27
    § 70-1304. See, also, § 70-1305 (“disputed portion”).
    28
    § 70-1304.
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    arbitration board “for the purpose of clarifying and narrowing
    the specific issues from those set forth in the detailed state-
    ment of disputed issues.”29
    An arbitrated dispute may be intertwined with contractual
    issues. The Legislature clearly contemplated the existence of
    power contracts.30 Often, such contracts speak to amounts that
    may be charged for electricity. In order to resolve a dispute,
    an arbitration board may need to determine whether there was
    contractual compliance. The arbitration board has authority to
    “consider only those matters necessary for the resolution of the
    disputed issues” but it may “not alter or modify any existing
    contract.”31 We conclude that where, as here, contractual issues
    are intertwined with a rate dispute, such contractual issues are
    within the arbitration board’s jurisdiction.
    We note that no party is attacking the constitutionality of
    the statutes contained in §§ 70-1301 to 70-1329. We express
    no opinion on the relationship of these statutes to the juris-
    diction conferred upon a district court under the Nebraska
    Constitution.32
    2. Whether R ate Structure
    Violates § 70-655(1)
    (a) Additional Evidence at Hearing
    NPPD presented considerable evidence concerning its
    efforts to address its unfunded OPEB liability. NPPD’s whole-
    sale billing manager testified that if NPPD had collected the
    full unfunded OPEB obligation of $150 million in 1 year, it
    would have resulted in a rate increase of over 22 percent—
    a much larger rate increase than the 3.7 percent that was
    implemented. The manager testified as to the amounts of
    purchasers’ pro rata shares of OPEB that they could avoid by
    29
    § 70-1312.
    30
    See §§ 70-1303, 70-1304, and 70-1314.
    31
    See § 70-1314.
    32
    See Neb. Const. art. V, § 9.
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    reducing their purchases under the 2002 WPC. In the aggre-
    gate, purchasers potentially could avoid $3,750,000 of their
    pro rata share of the $150 million OPEB catch-up collection.
    The manager emphasized fairness and reasonableness and
    stated that because the costs were associated with past serv­
    ice, NPPD needed to find a way to recover the costs from all
    of its customers who had benefited from them. He believed
    that NPPD’s methodology was reasonable because it tried to
    recover the unfunded obligation over a 6-year period, which
    was the remaining time period in the 2002 WPC.
    NPPD’s chief financial officer testified that in 2016, NPPD
    borrowed approximately $23 million on behalf of the 2016
    WPC customers by issuing taxable debt to generate bond pro-
    ceeds. The interest on the borrowing was capitalized through
    2021. NPPD borrowed a similar amount under similar terms
    for the 2017 catch-up. The chief financial officer explained
    that purchasers and customers under the 2016 WPC “are both
    being charged the exact same rate, except for the 2016 con-
    tract customers I have borrowed their pro rata share and made
    that deposit into the OPEB trust and I’ve recorded a regula-
    tory asset that says they will have to pay that beginning in
    2022.” Because the rates are identical, the difference in what
    is charged and collected is a function of the discount. With the
    discount, OPEB gets paid from two sources: contributions from
    ratepayers and investment earnings in the trust.
    According to the chief financial officer, the purpose of
    the discount would be “deferring the collection of that 2016
    and now 2017 catch-up amount until 2022 through 2033, the
    same time period.” She explained that the wholesale custom-
    ers would pay the same amount, but it would be collected
    over a different time period. In order for the delayed pay-
    ments to equate to a payment today, NPPD would have to
    apply a discount rate between 3.37 and 3.9 percent. The chief
    financial officer testified that the discount was “a mechanism
    to fairly collect the OPEB catch-up from two different cus-
    tomer groups.”
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    Purchasers’ expert, David Dismukes, a consulting econo-
    mist, viewed purchasers and the customers under the 2016
    WPC as similarly situated in terms of the nature of the power
    service they receive from NPPD. Dismukes testified that cus-
    tomers can be charged different rates, but that the rates “have
    to be justifiable and there has to be a cost basis for that.”
    Dismukes opined that the rate structure created discrimina-
    tion between the two sets of customers. He explained that simi-
    larly situated customers were being assessed rates that differed
    for taking similarly situated services. According to Dismukes,
    there were no cost differences between the two groups of cus-
    tomers. The signing of the 2016 WPC was the only difference,
    and Dismukes did not believe that the execution of a new
    contract justified a different rate. He testified that there was
    no legitimate cost basis supporting the discount mechanism.
    Based on Dismukes’ knowledge of the industry, he believed
    that a discount for one subset of customers and not the other
    constituted rate discrimination.
    From a cost-based rate-setting perspective, Dismukes dis-
    agreed with testimony to the effect that both groups would
    ultimately pay the same amount. He pointed out that “a dollar
    today is not the same as a dollar tomorrow” and that there was
    a benefit to not making the payment today. He testified that
    the timing difference created an economic advantage of suffi-
    cient consequence to support a finding of discrimination. Thus,
    Dismukes opined that NPPD did not set its rates in a manner
    that was fair, reasonable, and nondiscriminatory.
    NPPD’s expert, Joseph Mancinelli, the general manager
    and president of a consulting firm specializing in management
    economics predominantly serving the public power market,
    disagreed. He opined that NPPD’s 2016 and 2017 rates were
    fair, reasonable, and nondiscriminatory. In arriving at that
    conclusion, he looked at the unfunded accrued OPEB liability,
    which was incurred over a historical period and was directly
    attributed to the labor of retirees. He testified that it was
    proper to recover those costs from customers who enjoyed
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    those benefits, i.e., the 2002 WPC and 2016 WPC customers.
    Mancinelli believed that the rates were adequate and would
    support the revenue requirement.
    Mancinelli explained that there was one rate and that the
    difference was the source of the funding of the OPEB liability.
    Because the 2016 WPC customers had a long contract, the cost
    was financed. But financing was not an option for the 2002
    WPC customers, so the funding came out of rate revenues. He
    stated that the source of the funds created a difference and that
    difference “is the genesis of what we call the discount.”
    Mancinelli believed that the cost of borrowing the money
    was not materially different from the discount. He testified that
    the discount was cost based and that it was basically the dif-
    ference between funding the trust with cash from revenues or
    funding the trust with borrowed funds. Mancinelli was unaware
    of any other utility imposing a rate increase for the exclusive
    purpose of collecting money for an OPEB trust. Although
    NPPD’s situation and solution was unique, he opined that it
    met the test of being fair, reasonable, and nondiscriminatory.
    (b) Discussion
    Purchasers contend that the rate structure for 2016 and 2017
    violates § 70-655. That statute requires NPPD’s board of direc-
    tors to fix adequate rates that are “fair, reasonable, nondis-
    criminatory, and so adjusted as in a fair and equitable manner
    to confer upon and distribute among the users and consumers
    . . . the benefits of a successful and profitable operation and
    conduct of the business of the district.”33 As the party claiming
    discrimination, purchasers have the burden of proof to estab-
    lish its existence.34
    [10] Purchasers rely on McGinley v. Wheat Belt P.P. Dist.35
    In that case, a wholesale distributor informed Wheat Belt
    33
    § 70-655(1).
    34
    See 12 Eugene McQuillin, The Law of Municipal Corporations § 35:57
    (3d ed. 2017).
    35
    McGinley v. Wheat Belt P.P. Dist., 
    214 Neb. 178
    , 
    332 N.W.2d 915
    (1983).
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    Public Power District (Wheat Belt) that the distributor would
    be imposing a surcharge on Wheat Belt, which would be
    assessed on the basis of Wheat Belt’s summer peak demand.
    To deal with the surcharge, Wheat Belt created two classes of
    customers based on the date the customer requested service.
    Customers before a certain date would be protected from
    increased costs associated with the surcharge, on the theory
    that it was the new customers who were causing the increased
    summer peak demand. As a result, Wheat Belt charged mark-
    edly different rates for customers receiving similar service. We
    concluded that Wheat Belt’s action in establishing two classes
    of customers and assessing most of the surcharge to one class
    was arbitrary and discriminatory. We stated, “Persons receiv-
    ing similar service under similar circumstances cannot be
    charged for such service in an arbitrary, designed, dissimi-
    lar manner.”36
    McGinley is distinguishable from the situation at hand.
    There, Wheat Belt wanted to assess the bulk of a surcharge
    against one class of customers. To do so, it wanted to charge
    different rates to similarly situated customers. Here, NPPD is
    charging but one rate—purchasers are charged the same rate
    as NPPD’s customers under the 2016 WPC. The difference
    between the amounts charged to purchasers and the 2016 WPC
    customers is attributable to a discount for the 2016 WPC cus-
    tomers. Of course, under some circumstances, charging one
    rate but conferring a discount upon some customers could be
    discriminatory. But here, as discussed below, there was a rea-
    sonable basis for NPPD’s ratemaking determination.
    The discount is tied to the OPEB liability. That liability
    relates solely to past services of NPPD employees, and pur-
    chasers received the benefit of those services. Because a spe-
    cific portion of OPEB cannot be connected to any particular
    customer, NPPD allocated the liability on a pro rata basis.
    It is reasonable for purchasers to pay their pro rata share of
    36
    
    Id. at 187,
    332 N.W.2d at 920.
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    the liability. And the catch-up amounts, which were based on
    actuarial studies, are not arbitrarily established.
    There is a reasonable basis for the discount. If a variance in
    rates is based upon a reasonable and fair difference in condi-
    tions that equitably and logically justifies a different rate, any
    discrimination is not unjust.37 Purchasers opted not to extend
    their contractual relationship with NPPD; thus, NPPD had a
    shorter period of time in which to collect purchasers’ pro rata
    share of the liability. On the other hand, customers under the
    2016 WPC extended their relationship with NPPD for an addi-
    tional 20 years, thereby giving NPPD a longer period of time
    over which to collect those customers’ pro rata share.
    NPPD crafted a plan to collect the OPEB catch-up expense
    at different times. Under the plan, purchasers pay their por-
    tion of the OPEB catch-up expense over the 6 years remaining
    on their contract, while customers under the 2016 WPC get a
    discount during those years and will pay the catch-up expense
    between 2022 and 2033. It is the difference in the remaining
    terms of the contractual relationship with NPPD between pur-
    chasers and customers under the 2016 WPC that allows for the
    different collection of the OPEB liability. The effort to fund the
    OPEB trust through catch-up amounts in 2016 and 2017 was
    an effort to mitigate the risk of shifting the cost of the com-
    mon liability onto the customers under the 2016 WPC. Under
    the circumstances of this case, the discount for one group of
    customers is not discriminatory.
    The methodology assured that both classes of customers
    would pay an equal share of OPEB costs—the difference
    would be solely in the timing of the payments. Contrary to
    purchasers’ argument, the financing scheme imposed a future
    cost sufficient to remedy the advantage that the 2016 WPC
    customers otherwise would have had from paying their share
    later. In other words, an approximation of the time value of
    37
    See 14 William Meade Fletcher, Fletcher Cyclopedia of the Law of
    Corporations § 6681 (Carol A. Jones ed., perm. ed., rev. vol. 2012).
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    money was built into the mechanism employed to ensure that
    both classes of customers were treated fairly. In evaluating
    the experts’ testimony, the arbitration board had the advan-
    tage of observing them and making judgments considering
    their credibility. We have considered and given weight to
    that fact.
    3. Whether R ate Structure
    Breached 2002 WPC
    Purchasers next argue that the discount constitutes a breach
    of the 2002 WPC. It does not. Under the 2002 WPC, purchas-
    ers agreed to pay “amounts reasonably required to be set aside
    in reserves for items” such as OPEB. The catch-up amounts
    were reasonably within the definition of revenue requirements.
    This assignment of error lacks merit.
    4. Whether R ate Structure Breached
    Covenant of Good Faith
    [11,12] Finally, purchasers argue that the discount breached
    the covenant of good faith and fair dealing. The implied cov-
    enant of good faith and fair dealing exists in every contract
    and requires that none of the parties to the contract do any-
    thing which will injure the right of another party to receive the
    benefit of the contract.38 The nature and extent of an implied
    covenant of good faith and fair dealing are measured in a par-
    ticular contract by the justifiable expectations of the parties.
    Where one party acts arbitrarily, capriciously, or unreasonably,
    that conduct exceeds the justifiable expectations of the sec-
    ond party.39
    [13] Purchasers claim that giving a discount to the 2016
    WPC customers penalized purchasers for exercising their con-
    tractual right to purchase energy elsewhere. We disagree. The
    availability of the discount was not connected to whether a
    38
    Coffey v. Planet Group, 
    287 Neb. 834
    , 
    845 N.W.2d 255
    (2014).
    39
    
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    customer reduced or limited its energy purchases from NPPD;
    rather, it was available to all customers under the 2016 WPC. A
    violation of the covenant of good faith and fair dealing occurs
    only when a party violates, nullifies, or significantly impairs
    any benefit of the contract.40 Purchasers did not have a right
    to avoid paying amounts toward unfunded accrued liability
    for OPEB. They have failed to show that NPPD significantly
    impaired any benefit of the 2002 WPC.
    VI. CONCLUSION
    We conclude that NPPD’s rate structure for 2016 and 2017
    was fair, reasonable, and nondiscriminatory. We further con-
    clude that the rate structure did not constitute a breach of either
    the 2002 WPC or the implied covenant of good faith and fair
    dealing. Accordingly, we affirm the decision of the arbitra-
    tion board.
    A ffirmed.
    Wright and Miller-Lerman, JJ., not participating.
    40
    Id.