aep-texas-central-company-the-state-of-texas-by-and-through-the-office-of ( 2008 )


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  •       TEXAS COURT OF APPEALS, THIRD DISTRICT, AT AUSTIN
    ON MOTION FOR REHEARING
    NO. 03-07-00196-CV
    Appellants, AEP Texas Central Company; the State of Texas,
    by and through the Office of the Attorney General, Consumer Protection
    and Public Health Division, Public Agency Representation Section; et al.
    // Cross-Appellant, Public Utility Commission of Texas
    v.
    Appellee, Public Utility Commission of Texas// Cross-Appellees, AEP Texas
    Central Company; the State of Texas, by and through the Office of the
    Attorney General, Consumer Protection and Public Health Division,
    Public Agency Representation Section; et al.
    FROM THE DISTRICT COURT OF TRAVIS COUNTY, 250TH JUDICIAL DISTRICT
    NO. D-1-GV-06-000827, HONORABLE JOHN K. DIETZ, JUDGE PRESIDING
    CONCURRING AND DISSENTING OPINION
    The Public Utility Commission issued a final order in the true-up proceeding to
    finalize “stranded costs” and other true-up balances for the AEP Texas Central Company and CPL
    Retail Energy, L.P. (collectively “TCC”). The district court affirmed the Commission’s final order
    in most respects, but reversed on three issues. For the reasons discussed below, I would affirm the
    district court’s judgment in part, reverse in part, and remand this cause to the Commission for further
    proceedings.
    I.     Factual and Procedural Background
    In 1999, the legislature determined it was in the public interest to restructure and
    partially deregulate the Texas retail electric power industry. See generally Tex. Util. Code Ann.
    § 39.001 (West 2007). To accomplish this mandate, the legislature enacted Senate Bill 7 (“SB 7”),
    which amended the Public Utility Regulatory Act (“PURA”).1 See Act of May 27, 1999, 76th Leg.,
    R.S., ch. 405, 1999 Tex. Gen. Laws 2543 (now codified in Chapter 39 of the PURA, Tex. Util.
    Code Ann. §§ 39.001-.910 (West 2007)); see also CenterPoint Energy Houston Electric, LLC
    v. Gulf Coast Coalition of Cities, No. 03-05-00557-CV, 2008 Tex. App. LEXIS 2819, at *3-19
    (Tex. App.—Austin Apr. 17, 2008, no pet. h.) (op. on reh’g) (describing statutory framework
    for transition to competitive retail electric market) (hereafter “CenterPoint”). SB 7 required each
    integrated electric utility to separate its business activities into three separate units—a power
    generation company, a transmission and distribution utility, and a retail electric provider. See
    Tex. Util. Code Ann. § 39.051 (West 2007).
    As part of the transition from regulation to retail competition, the legislature
    authorized each electric utility to recover “all of its net, verifiable, nonmitigable stranded costs
    incurred in purchasing power and providing electric generation service.” Tex. Util. Code Ann.
    § 39.252(a) (West 2007). The term “stranded costs” is defined in section 39.251 of the PURA,2 but
    1
    Tex. Util. Code Ann. §§ 11.001-64.158 (West 2007).
    2
    Section 39.251(7) defines the term “stranded costs” as:
    the positive excess of the net book value of generation assets over the market value
    of the assets, taking into account all of the electric utility’s generation assets, any
    above market purchased power costs, and any deferred debit related to a utility’s
    discontinuance of the application of Statement of Financial Accounting Standards
    2
    generally speaking, stranded costs represent prudently incurred expenditures made by the utilities
    in a regulated environment—previously recoverable over time through regulated rates paid by
    consumers—that have become unrecoverable in a competitive market. See Reliant Energy, Inc.
    v. Public Util. Comm’n, 
    101 S.W.3d 129
    , 132 (Tex. App.—Austin 2003) (hereafter “Reliant I”),
    rev’d in part sub nom. CenterPoint Energy, Inc. v. Public Util. Comm’n, 
    143 S.W.3d 81
    (Tex. 2004)
    (op. on reh’g). Recovery of stranded costs is one of the final steps in the transition from traditional
    cost-of-service regulation to retail competition.
    In addition to the recovery of stranded costs, the legislature’s deregulation plan
    required the Commission to determine each electric utility’s final fuel balance and capacity auction
    true-up award. See Tex. Util. Code Ann. §§ 39.201, .202(c), .262(d) (West 2007). Once determined
    by the Commission, the net sum of the final fuel balance and the capacity auction true-up award
    would result in a credit or bill from the affiliated power generation company to the transmission and
    distribution utility. See 
    id. § 39.262(d).
    To recover its stranded costs and finalize its other true-up balances, TCC filed an
    application with the Commission seeking a total true-up balance of $2,406,271,176, including
    interest through September 2005. This amount included a requested capacity auction true-up award
    No. 71 (“Accounting for the Effects of Certain Types of Regulation”) for
    generation-related assets if required by the provisions of this chapter. For purposes
    of Section 39.262, book value shall be established as of December 31, 2001, or the
    date a market value is established through a market valuation method under Section
    39.262(h), whichever is earlier, and shall include stranded costs incurred under
    Section 39.263.
    Tex. Util. Code Ann. § 39.251(7) (West 2007).
    3
    of $482,664,890, less TCC’s final fuel balance of $176,698,379. Several consumer groups
    intervened in the proceedings before the Commission to challenge TCC’s requested recovery.
    Among the intervenors were the State of Texas, the Office of Public Utility Counsel (OPC), the
    Texas Industrial Energy Consumers (TIEC), the Cities served by TCC (Cities),3 the Alliance for
    Valley Healthcare (AVH), the Alliance for Retail Markets, the Brownsville Public Utility Board, the
    Commercial Customers Group (CCG), Occidental Power Marketing, Reliant Energy, Inc., and the
    Texas Cotton Ginners’ Association. On review of TCC’s application, the Commission made several
    adjustments to the amounts requested by TCC. These adjustments related to TCC’s failure to use
    commercially reasonable means to mitigate potential stranded costs in relation to the sale of TCC’s
    share of the South Texas Nuclear Project (STP), the bundling of certain TCC gas plants as part of
    the sale of the Coleto Creek Coal Plant, disallowances to TCC’s capacity auction true-up award, and
    other items. In sum, the Commission awarded TCC a total recovery of $1,475,933,779.
    TCC and six intervenors sought judicial review of the Commission’s final order in
    district court. See Tex. Util. Code Ann. §§ 15.001, 39.262(j) (West 2007); Tex. Gov’t Code Ann.
    §§ 2001.171, .176 (West 2000). The district court reversed the Commission’s order on three issues.
    The district court held that the Commission erred by making adjustments to the net book value of
    3
    The 63 participating cities included: Aransas Pass, Beeville, Charlotte, Devine, Dilley,
    Eagle Pass, Edinburg, Edna, Ganado, Indian Lake, Ingleside, Ingleside on the Bay, Jourdanton,
    Kingsville, Los Fresnos, Luling, Lyford, Lytle, McAllen, Mathis, Mercedes, Nordheim, Odem,
    Palmview, Portland, Port Lavaca, Poteet, Primera, Raymondville, Rio Hondo, Sabinal, Smiley,
    South Padre Island, Victoria, Alamo, Bishop, Goliad, Gregory, Harlingen, La Feria, Pharr,
    Pleasanton, Port Aransas, Rancho Viejo, Weslaco, Carizzo Springs, Del Rio, Donna, Laredo, Crystal
    City, Corpus Christi, San Benito, Uvalde, Bay City, Bayview, Camp Wood, George West, Palm
    Valley, Refugio, Rio Grande City, San Juan, Sinton, and Taft.
    4
    TCC’s generation assets, by excluding the testimony and report offered by an expert witness, and
    by applying an interest rate specified in a rule that the supreme court had previously invalidated.
    TCC and six of the intervenors4 have filed separate appeals challenging the district court’s judgment,
    and the Commission has filed a cross-appeal.
    II.    Discussion
    On appeal, the parties urge this Court to reverse the district court’s judgment on
    various grounds. The Commission urges us to reverse those portions of the district court’s judgment
    which reversed the Commission’s final order. Specifically, the Commission urges that the district
    court erred in its findings that the Commission was prohibited from making adjustments to the net
    book value of TCC’s generation assets, that the interest rate used by the Commission was invalid,
    and that the Commission erred in excluding the testimony and report of an expert witness. TCC
    urges us to reverse portions of the district court’s judgment on the grounds that the district court
    erred in upholding the Commission’s disallowance and reduction to TCC’s capacity auction true-up
    award, and in affirming the Commission’s treatment of Accumulated Deferred Investment Tax
    Credits, Excess Deferred Federal Income Taxes, and excess mitigation credits. In addition, like the
    Commission, TCC urges that the district court erred in reversing the Commission’s use of the
    interest rate specified in the Commission’s true-up rule.
    4
    Those intervenors participating in this appeal include the State of Texas, Cities, AVH,
    CCG, OPC, and TIEC. The State, Cities, AVH, and TIEC have filed joint briefs, and I refer to them
    collectively as the “Joint Intervenors.” OPC and CCG have also filed joint briefs, and I refer to them
    collectively as “OPC/CCG.”
    5
    The six intervenors likewise assert various challenges to the district court’s judgment.
    The Joint Intervenors argue that the district court erred in reversing the Commission’s adjustments
    to the net book value of TCC’s generation assets and in reversing the Commission’s exclusion of
    the testimony and report of an expert witness. The Joint Intervenors further argue that the district
    court erred in affirming the Commission’s adjustments to the net book value of the STP and the
    Coleto Creek Coal Plant, as well as the Commission’s inclusion of construction work in progress
    (CWIP) in its calculation of net book value. The Joint Intervenors also argue that the district court
    erred in affirming the Commission’s failure to use the ECOM, or excess-cost-over-market, method
    to value TCC’s nuclear generation assets and in affirming the Commission’s determination that
    TCC’s auction of its share of the STP met statutory requirements. Finally, the Joint Intervenors
    argue that the Commission erred in allowing TCC to recover excess mitigation credits paid to retail
    electric providers, allowing TCC to recover interest on its capacity auction true-up award, and by
    refusing to reduce stranded costs to account for certain profits achieved by TCC from the sale of its
    generation assets.
    In addition to the claims raised by the Joint Intervenors, OPC/CCG also raise three
    challenges to the district court’s judgment affirming the Commission’s final order. First, OPC/CCG
    argue that the Commission violated the PURA by allowing TCC to recover stranded costs for
    generation assets that were not “uneconomic.” Like the Joint Intervenors, OPC/CCG also allege that
    the Commission erred in its failure to use the ECOM method to value TCC’s nuclear generation
    assets. Finally, OPC argues that the Commission erred in failing to reduce TCC’s stranded cost
    recovery by the total amount of TCC’s excess earnings for 1999-2001.
    6
    A.      Standard of Review
    This Court reviews the Commission’s final order under the substantial evidence rule.
    See Tex. Util. Code Ann. § 15.001; Tex. Gov’t Code Ann. § 2001.174 (West 2000). Under
    the substantial evidence rule, we give significant deference to the agency in its field of expertise.
    Railroad Comm’n v. Torch Operating Co., 
    912 S.W.2d 790
    , 792 (Tex. 1995); Texas Health
    Facilities Comm’n v. Charter Medical-Dallas, Inc., 
    665 S.W.2d 446
    , 452 (Tex. 1984). We presume
    that the agency’s order is valid and that its findings, inferences, conclusions, and decisions are
    supported by substantial evidence. City of El Paso v. Public Util. Comm’n, 
    883 S.W.2d 179
    ,
    185 (Tex. 1994); Charter 
    Medical, 665 S.W.2d at 452
    . The complaining party has the burden to
    overcome this presumption. City of El 
    Paso, 883 S.W.2d at 185
    ; Hammack v. Public Util. Comm’n,
    
    131 S.W.3d 713
    , 725 (Tex. App.—Austin 2004, pet. denied). In conducting a substantial evidence
    review, we evaluate the entire record to determine whether the evidence as a whole is such that
    reasonable minds could have reached the conclusion the agency must have reached in order to
    take the disputed action. Texas State Bd. of Dental Exam’rs v. Sizemore, 
    759 S.W.2d 114
    , 116
    (Tex. 1988); Suburban Util. Corp. v. Public Util. Comm’n, 
    652 S.W.2d 358
    , 364 (Tex. 1983). We
    may not substitute our judgment for that of the agency on the weight of the evidence on questions
    committed to the agency’s discretion. Tex. Gov’t Code Ann. § 2001.174; Charter 
    Medical, 665 S.W.2d at 452
    ; H.G. Sledge, Inc. v. Prospective Inv. & Trading Co., Ltd., 
    36 S.W.3d 597
    , 602
    (Tex. App.—Austin 2000, pet. denied).
    Under a substantial evidence review, the issue for the reviewing court is not whether
    we believe the agency’s decision was correct, but whether the record demonstrates some reasonable
    7
    basis for the agency’s action. Charter 
    Medical, 665 S.W.2d at 452
    ; Central Power & Light Co.
    v. Public Util. Comm’n, 
    36 S.W.3d 547
    , 561 (Tex. App.—Austin 2000, pet. denied). The evidence
    in the record may preponderate against the decision of the agency and nevertheless amount to
    substantial evidence. Charter 
    Medical, 665 S.W.2d at 452
    ; Meier Infinity v. Motor Vehicle Bd.,
    
    918 S.W.2d 95
    , 98 (Tex. App.—Austin 1996, writ denied). We will sustain the agency’s order if the
    evidence is such that reasonable minds could have reached the conclusion that the agency must have
    reached in order to justify its action. Charter 
    Medical, 665 S.W.2d at 453
    ; Suburban Util. 
    Corp., 652 S.W.2d at 364
    . We must uphold the agency’s order unless the agency’s decision is not
    reasonably supported by substantial evidence, in violation of a constitutional or statutory provision,
    in excess of the agency’s statutory authority, made through unlawful procedure, affected by other
    error of law, arbitrary or capricious, or characterized by an abuse of discretion. See Tex. Gov’t Code
    Ann. § 2001.174(2)(A)-(F).
    Several issues raised by the parties involve questions of statutory construction, which
    we review de novo. See, e.g., City of San Antonio v. City of Boerne, 
    111 S.W.3d 22
    , 25 (Tex. 2003)
    (appellate courts review matters of statutory construction de novo); In re Humphreys, 
    880 S.W.2d 402
    , 404 (Tex. 1994) (questions of law are always subject to de novo review). When construing
    a statute, our primary goal is to determine and give effect to the legislature’s intent. City of
    San 
    Antonio, 111 S.W.3d at 25
    . To determine legislative intent, we look to the statute as a whole,
    as opposed to isolated provisions. State v. Gonzalez, 
    82 S.W.3d 322
    , 327 (Tex. 2002). We begin
    with the plain language of the statute at issue and apply its common meaning. City of San 
    Antonio, 111 S.W.3d at 25
    . Where the statutory text is unambiguous, we adopt a construction supported
    8
    by the statute’s plain language, unless that construction would lead to an absurd result. Fleming
    Foods of Tex., Inc. v. Rylander, 
    6 S.W.3d 278
    , 284 (Tex. 1999). We give serious consideration to
    an agency’s interpretation of the statutes it is charged with enforcing, so long as that interpretation
    is reasonable and consistent with the statutory language. Tarrant Appraisal Dist. v. Moore,
    
    845 S.W.2d 820
    , 823 (Tex. 1993); Steering Comms. for the Cities Served by TXU Elec. v. PUC,
    
    42 S.W.3d 296
    , 300 (Tex. App.—Austin 2001, no pet.). This is particularly true when the statute
    involves a complex subject matter. Steering Comms. for 
    Cities, 42 S.W.3d at 300
    . Courts, however,
    “do not defer to administrative interpretation in regard to questions which do not lie within
    administrative expertise, or deal with a nontechnical question of law.” Rylander v. Fisher Controls
    Int’l, Inc., 
    45 S.W.3d 291
    , 302 (Tex. App.—Austin 2001, no pet.).
    Additionally, several issues raised by the parties challenge the Commission’s
    authority. The Public Utility Commission “is a creature of the Legislature and has no inherent
    authority.” Public Util. Comm’n v. GTE-SW Corp., 
    901 S.W.2d 401
    , 407 (Tex. 1995). Like other
    state administrative agencies, the Commission “has only those powers that the Legislature expressly
    confers upon it” and “any implied powers that are necessary to carry out the express responsibilities
    given to it by the Legislature.” Public Util. Comm’n v. City Pub. Serv. Bd., 
    53 S.W.3d 310
    , 316
    (Tex. 2001). It is not enough that the power claimed by the Commission be reasonably useful to
    the Commission in discharging its duties; the power must be either expressly conferred or necessarily
    implied by statute. The agency may not “exercise what is effectively a new power, or a power
    contradictory to the statute, on the theory that such a power is expedient for administrative
    purposes.” 
    Id. 9 B.
         The Statutory Scheme
    Before addressing the issues raised by the parties, it is helpful to review the statutory
    scheme allowing for the recovery of stranded costs and other true-up balances.
    1.      Recovery of stranded costs
    When the legislature mandated the transition from traditional cost-of-service
    regulation to retail competition, it recognized that many utility companies had made very large
    investments to build power generation plants, and that while the costs of these power plants might
    be recoverable from ratepayers in a regulated environment, these same costs “might well become
    uneconomic and thus unrecoverable in a competitive, deregulated power market.” CenterPoint
    
    Energy, 143 S.W.3d at 82
    ; see also City of Corpus Christi v. Public Util. Comm’n, 
    51 S.W.3d 231
    ,
    237-38 (Tex. 2001). The legislature called these uneconomic assets “stranded costs.” CenterPoint
    
    Energy, 143 S.W.3d at 82
    ; see also Tex. Util. Code Ann. §§ 39.001(b)(2), .251(7) (West 2007). As
    part of the transition to retail competition, the legislature made an express finding that it was in the
    public interest to allow utility companies to recover their stranded costs. See Tex. Util. Code Ann.
    § 39.001(b)(2) (West 2007). The legislature thus “set forth a comprehensive scheme for estimating,
    finalizing, and recovering those costs.” CenterPoint 
    Energy, 143 S.W.3d at 83
    ; see Tex. Util. Code
    Ann. §§ 39.201, .251-.254, .256-.265, .301-.313 (West 2007).
    The legislature provided a mechanism in section 39.262 of the PURA for each utility
    to recover its stranded costs. See Tex. Util. Code Ann. § 39.262. This mechanism requires each
    transmission and distribution utility, its affiliated retail electric provider, and its affiliated power
    generation company to jointly file an application with the Commission to finalize stranded costs.
    10
    
    Id. § 39.262(c).
    The legislature provided a formula to calculate a utility’s stranded costs. 
    Id. § 39.251(7).
    Under this formula, a utility’s stranded costs equal the excess amount of the net book
    value of generation assets minus the market value of those assets—i.e., SC = NBV – MV. 
    Id. Each utility
    has the burden of quantifying its stranded costs using one of four statutory
    methods. 
    Id. § 39.262(h).
    These methods include sale-of-assets, stock valuation, partial stock
    valuation, or exchange of assets. 
    Id. § 39.262(h)(1)-(4).
    TCC chose to establish its stranded costs
    using the sale-of-assets method. Under this method, TCC was required to demonstrate that it sold
    its generating assets in a “bona fide third-party transaction under a competitive offering.” 
    Id. § 39.262(h)(1).
    Once this showing has been made, the total net value realized from the sale will
    establish the market value of the generation assets sold. 
    Id. The legislature
    recognized, however, that during the transition from regulation to
    retail competition, utilities would not necessarily have a business incentive to reduce their potential
    stranded costs. Accordingly, the legislature provided a statutory incentive—the legislature required
    each utility to “pursue commercially reasonable means to reduce its potential stranded costs,
    including good faith attempts to renegotiate above-cost fuel and purchased power contracts or
    the exercise of normal business practices to protect the value of its assets.” 
    Id. § 39.252(d).
    The
    legislature also required the Commission to consider each utility’s efforts to mitigate potential
    stranded costs when determining the utility’s final stranded cost balance. 
    Id. In addition,
    the
    legislature required the Commission to ensure that each utility does not overrecover stranded costs.
    
    Id. § 39.262(a);
    see also CenterPoint 
    Energy, 143 S.W.3d at 98-99
    .
    11
    2.      Determination of non-stranded-cost true-ups
    As part of the transition to deregulation, the legislature also required the Commission
    to conduct additional true-up proceedings to calculate each utility’s final fuel balance and capacity
    auction true-up award. Tex. Util. Code Ann. § 39.262(d). The parties do not dispute the
    Commission’s determination of TCC’s final fuel balance, but TCC and the Joint Intervenors both
    challenge the Commission’s determination of TCC’s capacity auction true-up award. Following is
    a brief description of the purpose of the capacity auction and its statutory requirements.
    To ensure the availability of power in the emerging competitive market, the
    legislature required power generation companies to auction entitlements to at least 15% of their
    installed generation capacity beginning 60 days prior to the start of customer choice on January 1,
    2002. See Tex. Util. Code Ann. §§ 39.153, .156 (West 2007); Reliant 
    I, 101 S.W.3d at 137
    . The
    utilities’ obligation to auction generation capacity continued until the earlier of 60 months
    (five years) after January 1, 2002, or the date on which the Commission determines that 40 percent
    or more of the electric power consumed by residential and small commercial customers within the
    affiliated transmission and distribution company’s service area before the onset of customer choice
    is provided by nonaffiliated retail electric providers. See Tex. Util. Code Ann. § 39.153(b). The
    legislature directed the Commission to adopt rules defining the scope of the capacity entitlements
    to be auctioned and the procedure for the auction of those entitlements. 
    Id. § 39.153(e)-(g);
    see also
    16 Tex. Admin. Code § 25.381 (West 2007) (PUC Capacity Auction Rule).5
    5
    The current version of the capacity auction rule differs from that version originally
    promulgated by the Commission. Compare 25 Tex. Reg. 9139 (2000) (original rule), adopted
    25 Tex. Reg. 12961 (effective Jan. 4, 2001), with 16 Tex. Admin. Code § 25.381 (2007) (current
    12
    The legislature was concerned that consumers and generation companies could be
    harmed by “distortions and fluctuations in the market price of power during the first two years of
    deregulation.” See CenterPoint 
    Energy, 143 S.W.3d at 96
    . To alleviate this concern, the legislature
    designed the capacity auction true-up proceeding. 
    Id. The purpose
    of the capacity auction true-up
    proceeding was to provide those companies forced to participate in the required capacity auctions
    with a guaranteed return on the sales of power, while at the same time ensuring that consumers
    would not be harmed by fluctuating prices and market instability. 
    Id. The “guaranteed
    return,” or
    capacity auction true-up award, represents the difference between the price of power projected by
    the Commission in the 2001 ECOM model6 and the price of power obtained through the auctions.
    See Tex. Util. Code Ann. § 39.262(d)(2). The Commission was charged with calculating this
    return in the capacity auction true-up proceeding. 
    Id. § 39.262(d).
    As a result of the capacity auction
    true-up proceeding, consumers and generation companies were guaranteed that generation companies
    “will receive no more and no less” than a set margin for power sales predetermined by the
    Commission in 2001 when the ECOM model was run in compliance with section 39.201.
    CenterPoint 
    Energy, 143 S.W.3d at 96
    .
    rule). The primary difference relevant to this appeal concerns the adoption of “safe harbors” for the
    purpose of compliance with the rule. As originally adopted, the capacity auction rule did not include
    a safe harbor—or alternate means of compliance—but the rule was amended in 2002 to add a
    safe harbor. See 27 Tex. Reg. 5982 (2002) (adding subsection 25.381(h)(1)(B)(iv) among other
    provisions). I cite the current rule unless noted otherwise.
    6
    The ECOM model is a computer model used by the Commission to predict whether a
    utility will incur stranded costs. See CenterPoint Energy Houston Electric, LLC v. Gulf Coast
    Coalition of Cities, No. 03-05-00557-CV, 2008 Tex. App. LEXIS 2819, at *11 (Tex. App.—Austin
    Apr. 17, 2008, no pet. h.) (op. on reh’g).
    13
    With this statutory scheme in mind, I examine the parties’ complaints regarding the
    Commission’s determination of TCC’s stranded costs and other true-up balances.
    C.      Stranded Cost True-up
    The legislature defined stranded costs as the positive excess of the net book value of
    a utility’s generation assets over the market value of those assets. Tex. Util. Code Ann. § 39.251(7).
    The parties raise several challenges to the Commission’s determinations regarding both the market
    value and net book value of TCC’s generation assets.
    1.      Determination of market value
    The Joint Intervenors and OPC/CCG challenge the Commission’s determinations
    regarding the market value of TCC’s interest in the STP. As a preliminary matter, OPC argues that
    the Commission erred in allowing TCC to recover stranded costs for the STP because there was no
    evidence that the STP was an “uneconomic asset.”7 Assuming the Commission properly allowed
    TCC to recover stranded costs for the STP, the Joint Intervenors and OPC/CCG argue that the
    Commission erred in its market valuation of the STP because it failed to use the ECOM method
    prescribed in section 39.262(i) for valuing nuclear assets. The Joint Intervenors also argue in the
    alternative that the Commission erred in its conclusion that the STP auction was a bona fide third-
    party transaction within the meaning of section 39.262(h).
    7
    I agree with TCC that CCG has failed to preserve this issue for review. Therefore, I only
    address this issue to the extent it is raised by OPC.
    14
    (A)     Was the STP an “uneconomic asset”?
    OPC argues that TCC cannot recover stranded costs for its share of the STP because
    the STP was not an “uneconomic asset.” In support of this argument, OPC cites to section
    39.001(b)(2) of the PURA. In that section, the legislature found that it was in the public interest to
    “allow utilities with uneconomic generation related assets and purchased power contracts to recover
    the reasonable excess costs over market [value] of those assets and purchased power contracts.”
    Tex. Util. Code Ann. § 39.001(b)(2) (emphasis added). Based on this language, OPC argues that
    TCC was only permitted to recover stranded costs for its demonstrated “uneconomic generation
    related assets.” See 
    id. As a
    result, OPC argues that the Commission erred in allowing TCC to
    recover stranded costs for the STP because “the undisputed evidence in the record shows that net
    margins over the life of the STP far exceed the net book value of the plant.”
    OPC’s argument involves a matter of statutory construction. When construing
    a statute, our primary goal is to determine and give effect to the legislature’s intent. City of
    San 
    Antonio, 111 S.W.3d at 25
    . To determine legislative intent, we look to the statute as a whole,
    as opposed to isolated provisions. 
    Gonzalez, 82 S.W.3d at 327
    . In addition to the language relied
    on by OPC in section 39.001(b)(2), section 39.251(7) of the PURA defines the term “stranded costs”
    as “the positive excess of the net book value of generation assets over the market value of the assets,
    taking into account all of the electric utility’s generation assets.” Tex. Util. Code Ann. § 39.251(7)
    (emphasis added). Section 39.251(3) defines the term “generation assets” as “all assets associated
    with the production of electricity, including generation plants, electrical interconnections of
    the generation plant to the transmission system, fuel contracts, fuel transportation contracts, water
    15
    contracts, lands, surface or subsurface water rights, emissions related allowances, and gas pipeline
    interconnections.” 
    Id. § 39.251(3)
    (emphasis added). Section 39.252(a) provides that “[a]n electric
    utility is allowed to recover all of its net, verifiable, nonmitigable stranded costs incurred in
    purchasing power and providing electric generation service.” 
    Id. § 39.252(a)
    (emphasis added).
    When read together, these provisions allow a utility to recover all of its stranded costs
    for generation related assets when the net book value exceeds the market value of those assets. See
    
    id. §§ 39.251(3),
    (7), .252(a). None of these provisions includes the phrase “uneconomic assets,”
    nor does the legislature otherwise limit the recovery of stranded costs to only “uneconomic assets.”
    In section 39.252(a), the legislature expressly provided that a utility may recover “all of its net,
    verifiable, nonmitigable stranded costs.” See 
    id. § 39.252(a)
    (emphasis added). There is no
    indication in other provisions of the PURA that the legislature intended to limit a utility’s recovery
    of stranded costs by its use of the phrase “uneconomic assets” in section 39.001(b)(2). It does not
    follow then that the legislature intended to limit recovery of stranded costs in the manner urged by
    OPC. Because the STP is a generation asset and all generation assets must be valued to determine
    TCC’s stranded costs, I conclude that the Commission properly determined that the STP was eligible
    for inclusion in the calculation of TCC’s stranded costs. I would overrule OPC’s issue one.
    (B)     Was the Commission required to use the ECOM method to determine
    the market value of the STP?
    OPC/CCG and the Joint Intervenors argue that the Commission was required to use
    the ECOM method in section 39.262(i) when determining the market value of the STP. OPC/CCG
    argue that TCC must use the ECOM method to value its nuclear assets absent a stock valuation, and
    16
    that the sale-of-assets method can never be used for that purpose. In contrast, the Joint Intervenors
    argue that because a utility has a duty to mitigate its stranded costs, the ECOM method in section
    39.262(i) must be used to value nuclear assets unless another method is shown to produce lower
    stranded costs.8
    These arguments also involve a matter of statutory construction. As previously stated,
    the primary objective when construing a statute is to ascertain and give effect to the legislature’s
    intent. City of San 
    Antonio, 111 S.W.3d at 25
    . To determine legislative intent, courts look to
    the statute as a whole, as opposed to isolated provisions. 
    Gonzalez, 82 S.W.3d at 327
    . A reviewing
    court gives deference to the Commission’s interpretation of a statute it is charged with enforcing as
    long as that interpretation is reasonable and consistent with the plain language of the statute. Tarrant
    Appraisal 
    Dist., 845 S.W.2d at 823
    ; Steering Comms. for 
    Cities, 42 S.W.3d at 300
    . Accordingly,
    I begin with the plain language of the PURA.
    In relevant part, section 39.262(h) provides, “Except as provided in Subsection (i) . . .
    the affiliated power generation company shall quantify its stranded costs using one or more of the
    following methods . . . .” Tex. Util. Code Ann. § 39.262(h). Section 39.262(h) goes on to specify
    four methods a utility may use to quantify its stranded costs: sale-of-assets, stock valuation, partial
    stock valuation, and exchange-of-assets. 
    Id. § 39.262(h)(1)-(4).
    In addition, section 39.262(i)
    provides, “Unless an electric utility or its affiliated power generation company combines all of its
    remaining generation assets into one or more transferee corporations as described in Subsections
    8
    Contrary to the suggestions of TCC and the Commission, the record demonstrates that
    AVH raised this claim in its motion for rehearing before the Commission and in its petition for
    judicial review before the district court. Therefore, I would conclude that the Joint Intervenors have
    preserved this claim for our review.
    17
    (h)(2) and (h)(3), the electric utility shall quantify its stranded costs for nuclear assets using the
    ECOM method . . . .” 
    Id. § 39.262(i).
    The Commission determined that, when read together, these statutes allow TCC to
    quantify its stranded costs for nuclear assets using any of the methods in section 39.262(h), including
    the sale-of-assets method. The Commission adopted PUC Substantive Rule 25.264, which confirms
    its interpretation allowing TCC to quantify its stranded costs for nuclear assets using the methods
    established in section 39.262(h). Rule 25.264 states:
    The market value of an affiliated power generation company’s nuclear assets may be
    established by compliance with any of the four methods of quantification specified
    in Public Utility Regulatory Act (PURA) § 39.262(h) and related requirements
    specified in § 25.263 of this title (relating to True-up Proceeding). If the electric
    utility or its affiliated power generation company values some of its assets using the
    sale of assets or an exchange of assets, any remaining assets shall be combined in one
    or more transferee corporations as described in PURA § 39.262(h)(2) and (3) for
    purposes of determining their market value, or the electric utility or its affiliated
    power generation company shall quantify its stranded costs for remaining nuclear
    assets using the “excess costs over market” or ECOM method.
    16 Tex. Admin. Code § 25.264 (2006) (Pub. Util. Comm’n). In its order adopting Rule 25.264, the
    Commission explained:
    This rule is necessary to firmly establish the methods that may be employed to
    determine the stranded cost of nuclear power generation assets. In addition, the rule
    is needed to serve the public interest and legislative policy stating that utilities with
    uneconomic generation-related assets should be allowed to recover the reasonable
    excess costs over market value of those assets. In order to assure that the market
    value of nuclear generation assets is properly quantified in a manner that reduces, to
    the extent possible, the amount of excess costs over market value for those assets, the
    rule clarifies that a public utility and its affiliated companies may use any of the
    valuation methods specified in PURA § 39.262(h) and (i) to quantify the market
    value of nuclear generation assets.
    18
    Tex. Pub. Util. Comm’n, Rulemaking Proceeding Concerning Quantification of Stranded
    Costs of Nuclear Generation Assets, Substantive Rule § 25.264, Docket No. 27464, Order at 2
    (May 23, 2003).
    The plain language of section 39.262(h) allows a utility or its affiliates to quantify
    stranded costs “using one or more of the following methods,” including the sale-of-assets method.
    Tex. Util. Code Ann. § 39.262(h). That section does not preclude a utility from using the sale-of-
    assets method to quantify its stranded costs for nuclear generation assets. 
    Id. Nor does
    the plain
    language of section 39.262(i) require a utility to use the ECOM method to quantify its stranded costs
    for nuclear generation assets. 
    Id. § 39.262(i).
    By its use of the word “remaining,” the language of
    section 39.262(i) presumes that it is a fallback provision and that a utility will use one of the four
    methods in section 39.262(h) to quantify stranded costs for nuclear assets. 
    Id. Only if
    a company
    has “remaining” assets will section 39.262(i) come into play.
    The definition of “market value” in section 39.251(4) likewise confirms this
    interpretation. Section 39.251(4) defines market value “for nonnuclear assets and certain nuclear
    assets, [as] the value the assets would have if bought and sold in a bona fide third-party transaction
    or transactions on the open market under Section 39.262(h) or, for certain nuclear assets, as
    described by Section 39.262(i), the value determined under the method provided by that subsection.”
    
    Id. § 39.251(4).
    The plain language of section 39.251(4) contemplates that nuclear assets might be
    “bought and sold in a bona fide third-party transaction.” 
    Id. The Commission’s
    interpretation allowing TCC to quantify its stranded costs for
    nuclear assets using the sale-of-assets method was reasonable and consistent with the plain language
    19
    of the statute. In addition, PUC Rule 25.264 comports with the statute.9 For these reasons, I would
    overrule OPC/CCG’s issue two.
    To the extent the Joint Intervenors argue that TCC was required to use the ECOM
    method to quantify its stranded costs for nuclear assets because that method would have produced
    lower stranded costs, I would likewise reject that claim. To adopt the Joint Intervenors’ argument
    would require the utility to know in advance which method would produce the least amount of
    stranded costs. It is only in hindsight that a utility will know whether the method it has chosen to
    quantify its stranded costs will produce lower stranded costs than the ECOM method. The plain
    language of section 39.262(h) does not require a utility to engage in forecasting the future. Although
    the legislature required utilities to mitigate their potential stranded costs and provided that a utility
    may recover only its “net, verifiable, nonmitigable stranded costs,” the legislature also gave the
    utility the option of choosing which method it would use to quantify stranded costs. See Tex. Util.
    Code Ann. § 39.262(h). That the utility had this choice is confirmed by the mandatory language
    of section 39.262(h), which states that “the affiliated power generation company shall quantify
    its stranded costs using one of the following methods.” 
    Id. § 39.262(h).
    I would overrule Joint
    Intervenors’ issue three.
    9
    Because I conclude that the Commission’s interpretation is reasonable and consistent with
    the statute and that the rule comports with the statute, I would not reach the issue of whether
    OPC/CCG’s claim is an impermissible collateral attack on the validity of the rule.
    20
    (C)     Was the sale of TCC’s share of the STP a bona fide third-party
    transaction under a competitive offering?
    In the alternative, the Joint Intervenors argue that the Commission erred in
    its conclusion that TCC’s sale of its share of the STP was a bona fide third-party transaction under
    a competitive offering as required under section 39.262(h). This argument is without merit.
    The primary complaint of the Joint Intervenors is that the Commission failed to
    follow its precedent in the Texas-New Mexico Power true-up, where the Commission determined
    that TNMP’s sale of generation assets was not a bona fide third-party transaction under a competitive
    offering. But the record reflects that the facts of TCC’s sale of the STP differed from TNMP’s sale
    of its generation assets. The Commission determined that one of the most important aspects for
    determining whether a transaction meets the statutory requirements is whether the utility acquires
    competent and independent advice before and during the transaction. The record reflects that TCC
    chose several financial advisors to assist with the sale of its share of the STP, not just one, as TNMP
    did. The record also reflects that TCC’s choice of financial advisors was not motivated by an inside
    connection as was TNMP’s.10 The Commission also noted that two additional strengths of TCC’s
    sales process not present in that of TNMP’s was the marketing of the offering and the aggressive
    negotiations with bidders. The Commission determined that the basic structure of TCC’s process
    promoted competitive and good-faith participation by bidders. Because the facts of TCC’s sales
    process differed substantially from that of TNMP’s, the Commission was not bound to follow its
    10
    In TNMP’s case, TNMP chose Laurel Hill as its only financial advisor based on
    the merger agreement between TNMP’s parent company TNP Enterprises and ST Acquisition
    Corporation. Because the managing director of Laurel Hill was also the chief financial officer of
    TNP Enterprises, the Commission concluded that Laurel Hill was chosen because of its inherent
    relationship with TNMP’s parent company and not because it offered significant expertise in the sale
    of a utility’s generation assets.
    21
    precedent in that case or, in any event, it did not constitute precedent as to this transaction. On this
    record, there was a reasonable basis to support the Commission’s determination that TCC’s sale of
    its share of the STP was a bona fide third-party transaction under a competitive offering in
    compliance with section 39.262(h). I would overrule Joint Intervenors’ issue four.
    2.      Adjustments to net book value
    (A)     Commercial unreasonableness
    In its final order, the Commission made two adjustments to the net book value of
    TCC’s generation assets to address what it determined to be commercial unreasonableness and the
    failure to mitigate stranded costs by TCC. Specifically, the Commission reduced the net book value
    of TCC’s Coleto Creek Coal Plant by $8 million and reduced the net book value of TCC’s share in
    the STP by $68.7 million. The district court found that these two adjustments were barred by
    section 39.252(d) of the PURA. The Commission and the Joint Intervenors appeal the reversal of
    these two adjustments. In addition, the Joint Intervenors contend that the Commission’s calculation
    of these two adjustments was in error. In a related issue, the Joint Intervenors also argue that the
    Commission erred in failing to adjust net book value for TCC’s commercial unreasonableness in
    failing to use “bridge power sales agreements.”
    For the reasons stated in Justice Pemberton’s opinion, a majority of this Court affirms
    the district court’s judgment that section 39.252(d) of the PURA precludes the Commission
    from making adjustments to the net book value of TCC’s generation assets for “commercial
    unreasonableness.”11 I disagree with the majority’s decision.
    11
    For this reason, Justices Puryear and Pemberton do not join parts II.C.2(A)(i) through (iii)
    of this opinion, except to the extent we overrule Joint Intervenors’ issue seven and affirm the district
    22
    As an initial matter, these claims require the Court to consider the Commission’s
    authority under section 39.252(d) to make adjustments to the net book value of TCC’s generation
    assets—a question this Court already decided in Reliant 
    I, 101 S.W.3d at 149
    . Section 39.252(d)
    provides:
    An electric utility shall pursue commercially reasonable means to reduce its potential
    stranded costs, including good faith attempts to renegotiate above-cost fuel and
    purchased power contracts or the exercise of normal business practices to protect the
    value of its assets. The commission shall consider the utility’s efforts under this
    subsection when determining the amount of the utility’s stranded costs; provided,
    however, that nothing in this section authorizes the commission to substitute its
    judgment for a market valuation of generation assets determined under Sections
    39.262(h) and (i).
    Tex. Util. Code Ann. § 39.252(d). In Reliant I, this Court held that section 39.252(d) authorized
    the Commission to make adjustments to net book value when a utility does not pursue commercially
    reasonable means to reduce potential stranded costs. 
    See 101 S.W.3d at 149
    . We further observed
    that the relevant statutory goal was calculating not just an accurate stranded cost amount,
    but “calculating an accurate ‘verifiable, non-mitigable stranded cost[]’ amount.” 
    Id. (quoting Tex.
    Util. Code Ann. § 39.252(d)). And we recognized that “[c]ompliance with the duty to pursue
    commercially reasonable means to mitigate its potential stranded costs is what makes stranded costs
    non-mitigable.” See 
    id. Given the
    plain language of section 39.252(d), we held in Reliant I that
    nothing in section 39.252(d) prohibits the Commission from reducing net book value if it concludes
    that a utility fails to comply with the duty to mitigate potential stranded costs. 
    Id. court’s judgment
    and the Commission’s final order regarding the use of bridge power sales
    agreements.
    23
    I disagree with TCC’s assertion that Reliant I “does not address the issue of when
    the Commission may properly adjust net book value.” This Court’s holding in Reliant I made clear
    that the Commission may properly adjust net book value when it determines that a utility has not
    pursued commercially reasonable means to reduce its potential stranded costs. 
    Id. I see
    no reason
    to re-examine that holding here. Accordingly, I would reaffirm this Court’s prior holding in Reliant
    I that section 39.252(d) allows the Commission to adjust the net book value of a utility’s generation
    assets when the utility fails to “pursue commercially reasonably means to reduce its potential
    stranded costs.” Id.; see also Tex. Util. Code Ann. § 39.252(d).
    This Court also considered the Commission’s authority to adjust net book value for
    commercial unreasonableness in the CenterPoint true-up appeal. See CenterPoint, 2008 Tex. App.
    LEXIS 2819, at *82-83. In CenterPoint, the Commission’s final order set forth a primary and
    alternative holding. 
    Id. at *21-23.
    Under its primary holding, the Commission adopted its own
    market valuation of CenterPoint’s generation assets based on its finding that CenterPoint had failed
    to establish the market value of those assets as required under section 39.262(h). 
    Id. at *23,
    *30-35.
    Under its alternative holding, the Commission adopted the market value proposed by CenterPoint,
    but made reductions to net book value based on commercial unreasonableness. 
    Id. at *23,
    *79. This
    Court considered whether the Commission’s reductions to net book value for commercial
    unreasonableness should also be applied to its primary holding. 
    Id. at *79-84.
    This Court concluded
    that reductions to net book value for commercially unreasonable behavior were not meant to be
    punitive in nature. 
    Id. at *82.
    The Court stated that where a utility’s commercially unreasonable
    behavior benefits the utility financially and lessens the impact of stranded costs by increasing
    24
    the utility’s stranded cost recovery, the amount of stranded costs recovered by the utility should
    be modified to capture the utility’s unreasonable behavior. 
    Id. The Court
    further explained that,
    if the commercially unreasonable behavior has no financial impact or, if the financial impact is
    irrelevant to or has already been accounted for in the valuation of the utility’s generation assets,
    any adjustment to the net book value of the utility’s generation assets would be contrary to the
    legislative directive. 
    Id. This Court
    ultimately concluded that the Commission’s decision in the CenterPoint
    true-up proceeding to limit the adjustments to net book value to its alternative holding was
    reasonable because the negative effects of any commercially unreasonable behavior on the part
    of CenterPoint had no effect on the valuation of CenterPoint’s generation assets. 
    Id. at *83-84.
    But
    this Court’s statements in CenterPoint suggest that an adjustment for commercial unreasonableness
    is appropriate if the valuation method chosen does not account for the commercially unreasonable
    behavior and the utility’s commercially unreasonable behavior benefits the utility unfairly by
    increasing its stranded cost recovery. See 
    id. at *82.
    TCC argues that section 39.252(d) only imposes a duty to mitigate potential stranded
    costs prior to a utility’s divestiture of its generation assets and that a utility has no duty to mitigate
    potential stranded costs during or after divestiture. Thus, because the Commission determined that
    TCC’s sales of the Coleto Creek Coal Plant and its share of the STP were bona fide third-party
    transactions under a competitive offering within the meaning of section 39.262(h)(1), TCC maintains
    that the Commission could not thereafter adjust the net book value of these assets for commercial
    unreasonableness. TCC’s argument is essentially one of timing—namely that a utility is required
    25
    to pursue commercially reasonable means to mitigate stranded costs only up to the point that it
    decides to sell its generation assets, but not thereafter.
    This is not what the legislature provided. See Tex. Util. Code Ann. § 39.252(d).
    Nowhere in section 39.252(d) does the legislature limit a utility’s duty to mitigate potential stranded
    costs in the manner urged by TCC. The determination of whether a sale is a bona fide third-party
    transaction under a competitive offering is distinct from the determination of whether TCC used
    commercially reasonable means to mitigate stranded costs. As the Commission explained in its
    final order, the analysis of whether a sale is a bona fide third-party transaction under a competitive
    offering is directed towards the requirements of section 39.262(h)(1) in determining the market
    value of generation assets. See 
    id. § 39.262(h)(1).
    In contrast, a determination of commercial
    reasonableness of a company’s mitigation efforts is made under section 39.252(d), and applies not
    only to the sales process, but also to other actions that the seller may take to mitigate stranded costs.
    See 
    id. § 39.252(d).
    The Commission’s interpretation of the statute is further supported by the plain
    language of section 39.262(a), which provides that a utility “may not be permitted to overrecover
    stranded costs through the procedures established by this section or through the application of
    the measures provided by the other sections of this chapter.” Tex. Util. Code Ann. § 39.262(a). The
    legislative intent is clear—a utility may not be permitted to overrecover stranded costs. See 
    id. In light
    of the statute’s plain language and deferring to the Commission’s reasonable construction of
    the statute it is charged with enforcing, I would hold that the Commission’s finding that TCC’s sales
    of its generation assets were bona fide third-party transactions under a competitive offering does
    not preclude it from determining that TCC’s conduct undertaken in pursuit of those sales was
    26
    commercially unreasonable. Under a plain reading of the statute, the former simply does not
    foreclose the latter. See 
    id. To the
    extent it holds otherwise, the majority restricts a utility’s duty to mitigate
    stranded costs in a manner not contemplated by the legislature. There is nothing temporal in the
    statute that precludes the Commission from adjusting the net book value of a utility’s generation
    assets based on commercially unreasonable conduct occurring before, during, or after an asset
    sale—particularly where the market valuation method employed by TCC does not take into account
    its commercially unreasonable behavior. Accordingly, I would sustain the Commission’s issue one
    and Joint Intervenor’s issue one, and I would reverse the district court’s judgment that section
    39.252(d) prohibits the Commission’s adjustments to net book value. Because the majority does not,
    I respectfully dissent.
    As a result of my conclusion that section 39.252(d) does not prohibit the
    Commission’s adjustments to net book value, it is necessary to consider the parties’ challenges to
    the Commission’s calculation of individual adjustments to net book value and whether the valuation
    method chosen by TCC accounts for the alleged commercially unreasonable behavior found by
    the Commission. See CenterPoint, 2008 Tex. App. LEXIS 2819, at *81-84. Unlike its order
    in CenterPoint, the Commission adopted only one holding in its final order here. In that order,
    the Commission adopted two adjustments for commercial unreasonableness: (1) an $8 million
    reduction to net book value based on TCC’s decision to bundle and sell the Coleto Creek Coal Plant
    with other less desirable generation assets; and (2) a $68.7 million reduction to net book value based
    27
    on TCC’s failure to develop an estimate of the value of its share of the STP, the corresponding lack
    of knowledge of the STP’s intrinsic value, and the lack of a walk-away price for its share of the STP.
    (i)     TCC’s choice to bundle the gas plants with Coleto Creek
    The record shows and TCC admits that its decision to bundle the gas plants with
    the Coleto Creek Coal Plant for purposes of divestiture decreased the market value of the Coleto
    Creek Coal Plant by $8 million—the amount of the Commission’s adjustment for commercial
    unreasonableness. The Commission accepted TCC’s proposal to reduce net book value for Coleto
    Creek by $8 million and rejected the intervenors’ request for a much greater reduction. The
    $8 million reduction to net book value was based on the difference between Sempra’s bid for the
    Coleto Creek Coal Plant alone and its bid for the bundle of plants, which was $8 million lower than
    the stand-alone bid for Coleto Creek.
    TCC’s decision to bundle the gas plants with Coleto Creek financially benefitted the
    utility and lessened the impact of stranded costs. Moreover, the valuation method chosen—the total
    net value realized from the asset sale—did not account for the decreased market value caused
    by TCC’s decision to bundle the plants. Because the effect of TCC’s commercially unreasonable
    decision to bundle the Coleto Creek Coal Plant with other less desirable assets was not captured in
    the valuation method chosen by TCC, I would conclude that the Commission’s $8 million reduction
    to TCC’s net book value for the Coleto Creek Coal Plant was appropriate. I would therefore
    consider the Joint Intervenors’ challenge to this adjustment.
    28
    The Joint Intervenors challenge the Commission’s $8 million adjustment to the net
    book value of the Coleto Creek Coal Plant on the grounds that it is not supported by substantial
    evidence. They argue that the Commission’s adjustment to the net book value of Coleto Creek
    should have been higher than $8 million.
    When conducting a substantial evidence review, a reviewing court must determine
    whether the evidence as a whole is such that reasonable minds could have reached the conclusion
    reached by the Commission. City of El 
    Paso, 883 S.W.2d at 186
    ; 
    Sizemore, 759 S.W.2d at 116
    . The
    true test is not whether we believe the agency reached the correct conclusion, but whether
    some reasonable basis exists in the record for the action taken by the agency. Charter 
    Medical, 665 S.W.2d at 452
    . The Commission is the sole judge of the weight to be accorded the testimony
    of each witness. Central Power & Light 
    Co., 36 S.W.3d at 561
    . We may not substitute our
    judgment for that of the Commission on the weight of the evidence on questions committed to
    the Commission’s discretion. Tex. Gov’t Code Ann. § 2001.174; see Charter 
    Medical, 665 S.W.2d at 452
    ; H.G. 
    Sledge, 36 S.W.3d at 602
    . The Commission was entitled to accept or reject in whole
    or in part the testimony of the various witnesses who testified. See City of Corpus Christi v. Public
    Util. Comm’n, 
    188 S.W.3d 681
    , 695 (Tex. App.—Austin 2005, pet. denied); Central Power & Light
    
    Co., 36 S.W.3d at 561
    .
    The Commission concluded that TCC’s action of bundling Coleto Creek with the old
    gas-fired and hydroelectric plants adversely affected the amount bid for Coleto Creek, thereby
    increasing TCC’s stranded costs. The prevailing bidder, Sempra/Riverstone, submitted a bid for
    Coleto Creek alone and a separate bid for the bundled plants. The bid for Coleto Creek alone was
    29
    $8 million higher than the bid for the bundled plants together. Because the bids were virtually
    contemporaneous and were made by the same bidder for the same facilities, the Commission
    concluded that TCC’s decision to bundle its gas-fired and hydroelectric plants with Coleto Creek
    increased TCC’s stranded costs by $8 million. Accordingly, the Commission reduced TCC’s net
    book value by $8 million. The Joint Intervenors complain that this adjustment was not high enough
    because other evidence in the record suggested that TCC could have received an additional $68.2
    to $87.2 million for Coleto Creek.12 Because the Commission was entitled to accept or reject all or
    part of the testimony presented, see City of Corpus 
    Christi, 188 S.W.3d at 695
    ; Central Power
    & Light 
    Co., 36 S.W.3d at 561
    , I would conclude that the Commission’s decision to reduce the net
    book value of the Coleto Creek Coal Plant was supported by substantial evidence, and I would
    overrule Joint Intervenors’ issue five.
    (ii)    Failure to develop estimated value of the STP share
    The record shows that TCC never developed an estimate of the value of its share of
    the STP that was supported by economic or financial analysis. Thus, prior to the auction of its share
    of the STP, TCC had not formulated how much its share was worth.13 Without this information,
    12
    Cities witness Scott Norwood recommended a $68.2 million reduction to net book value
    based on his comparison of what TCC received for the Oklaunion Coal Plant and what it received
    for Coleto Creek; CCG witness Paul Wielgus testified that TCC could have received an additional
    $70 million for Coleto Creek; and consistent with Norwood’s testimony regarding the comparison
    between Oklaunion and Coleto Creek, OPC witness David Rode recommended a reduction to net
    book value of $87.2 million.
    13
    It is illogical to assume that a reasonable seller would not want to know the value of what
    he is selling.
    30
    TCC could not make an informed decision as to whether the negotiated sales price was reasonable.
    The valuation method chosen could not have accounted for TCC’s lack of knowledge.
    The Commission determined that TCC’s failure to develop an estimate of the value
    of its share of the STP, the corresponding lack of knowledge of the STP’s intrinsic value, and
    the lack of a walk-away price for the STP was commercially unreasonable and amounted to a failure
    to mitigate stranded costs. To account for TCC’s commercial unreasonableness, the Commission
    reduced the net book value of TCC’s share in the STP by $68.7 million. Under the standard set forth
    in CenterPoint, I would conclude that the Commission’s reduction to TCC’s net book value for
    its share of the STP was appropriate. I would therefore consider the Joint Intervenors’ challenge to
    this adjustment.
    The Joint Intervenors argue that the Commission’s adjustment should have been
    higher. We review the Commission’s adjustment under the substantial evidence rule, and we
    presume that the Commission’s determination is supported by substantial evidence. City of El 
    Paso, 883 S.W.2d at 187
    ; Office of Pub. Util. Counsel v. Public Util. Comm’n, 
    183 S.W.3d 555
    , 567
    (Tex. App.—Austin 2006, pet. denied). The Joint Intervenors have the burden of proving otherwise.
    Office of Pub. Util. 
    Counsel, 183 S.W.3d at 567
    .
    The record reflects that the Commission calculated the adjustment to net book value
    for TCC’s share of the STP based on the SEC filing of GC Power,14 the “Project Crayola”
    14
    GC Power purchased Texas Genco’s share of the STP.
    31
    documents,15 and a comparison of the pricing differential between Texas Genco’s16 sale of its share
    in the STP and TCC’s sale of its share in the STP. GC Power’s SEC filing states, “The purchase
    price for the nuclear acquisition . . . was $707.6 million, which includes $700 million in cash paid
    to Texas Genco Holdings, Inc. and approximately $7.6 million in acquisition costs.” The “Project
    Crayola” documents likewise demonstrated that the price of Texas Genco’s sale of its share in the
    STP was $700 million for 1100 MW, or approximately $636/kW. This was $109/kW higher than
    the price of TCC’s sale to Cameco for $527/kW. The Commission calculated its adjustment to net
    book value by multiplying the $109/kW difference times TCC’s 630 MW share of the STP, which
    produced an adjustment of $68.7 million.
    The Joint Intervenors argue that this adjustment was too low because Texas Genco
    actually received more than $636/kW for the sale of its share in the STP. The Joint Intervenors argue
    that the SEC filing shows that Texas Genco received $700 million for its original 770 MW share of
    the STP, not including the 330 MW it received when exercising its right of first refusal to purchase
    a portion of TCC’s share. But, as explained in the rebuttal testimony of TCC witness Mujeeb Qazi,
    the Joint Intervenors misconstrue the SEC filing relied upon by the Commission to determine
    the price that Texas Genco received for its share of the STP. As Qazi testified, the sale of Texas
    Genco’s share of the STP included the 330 MW that it received from TCC under the right of first
    15
    The “Project Crayola” documents were admitted without objection in the proceedings
    before the Commission.
    16
    Texas Genco was a co-owner of the STP and exercised its right of first refusal to purchase
    approximately 330 MW of TCC’s share in the STP. After this purchase, Texas Genco owned
    approximately 1100 MW of the STP’s total capacity, which it then sold to a third party.
    32
    refusal; thus, Texas Genco sold the entire 1100 MW share of the STP to GC power for $700 million.
    The Commission is the sole judge of the weight to be accorded the testimony of each witness.
    Central Power & Light 
    Co., 36 S.W.3d at 561
    . The Commission was entitled to accept or reject in
    whole or in part the testimony of the various witnesses who testified. See City of Corpus 
    Christi, 188 S.W.3d at 695
    ; Central Power & Light 
    Co., 36 S.W.3d at 561
    . We may not substitute our
    judgment for that of the Commission on the weight of the evidence on questions committed to the
    Commission’s discretion. Tex. Gov’t Code Ann. § 2001.174; see Charter 
    Medical, 665 S.W.2d at 452
    ; H.G. 
    Sledge, 36 S.W.3d at 602
    . Based upon Qazi’s testimony, I would conclude that there is
    a reasonable basis in the record to support the Commission’s $68.7 million adjustment to the net
    book value of TCC’s share of the STP, and I would overrule Joint Intervenors’ issue two.
    (iii)   Bridge Power Sales Agreements
    In their seventh issue on appeal, the Joint Intervenors assert that the Commission
    erred in failing to adjust net book value for TCC’s commercial unreasonableness in failing to use
    bridge power sales agreements.17 According to the Joint Intervenors, the Commission’s failure to
    require TCC to use bridge power sales agreements resulted in TCC’s failure to mitigate its potential
    stranded costs and allowed TCC to overrecover stranded costs in violation of sections 39.252(d) and
    39.262(a) of the PURA. Because TCC retained the profits from the interim power sales, the Joint
    17
    A bridge power sales agreement “would have enabled the buyers of TCC’s generating
    units to sell power from those units until the sales were finalized, with TCC being compensated
    with a higher asset-sale price.” Stated differently, the buyers, not TCC, would have received the
    benefit of the interim power sales and would have paid a higher purchase price to TCC for its
    generation assets.
    33
    Intervenors argue that, as a result of TCC’s failure to use bridge power sales agreements, the
    Commission should have reduced TCC’s stranded cost recovery by $206 million.
    Applying the standard set forth in CenterPoint, however, I would conclude that
    TCC’s failure to use bridge power sales agreements does not warrant an adjustment for commercial
    unreasonableness. Because TCC’s failure to use such agreements allowed TCC to retain the profits
    from power sales prior to closing the asset sale, the failure to use such agreements was accounted
    for in the valuation method chosen in the form of a lower asset sales price. I would overrule Joint
    Intervenors’ issue seven.
    (B)     Inclusion of construction work in progress
    The Commission included in net book value the amount that TCC had spent on
    generation related construction work in progress as of December 31, 2001.18 In their sixth issue, the
    Joint Intervenors argue that the Commission erred by including CWIP in the net book value of
    TCC’s generation assets. Specifically, the Joint Intervenors argue that the Commission failed to
    show that the inclusion of CWIP satisfied the requirements of section 36.05419 of the PURA and
    18
    This amount was $53,588,063, plus interest, and included only those CWIP amounts that
    TCC had spent as of December 31, 2001. It did not include projected costs for unfinished projects.
    19
    Section 36.054 states:
    (a)      Construction work in progress, at cost as recorded on the electric utility’s
    books, may be included in the utility’s rate base. The inclusion of
    construction work in progress is an exceptional form of rate relief that the
    regulatory authority may grant only if the utility demonstrates that inclusion
    is necessary to the utility’s financial integrity.
    34
    that these requirements were made applicable to the calculation of TCC’s stranded costs through
    section 39.260.20
    This Court recently rejected the same claim in our consideration of the appeal of
    the true-up proceeding of CenterPoint Energy. See CenterPoint, 2008 Tex. App. LEXIS 2819, at
    *118-26. In CenterPoint, we upheld the Commission’s inclusion of CWIP in net book value
    and explained that the Commission’s decision was proper for several reasons. 
    Id. at *121,
    *126.
    We rejected the construction urged by the Joint Intervenors in CenterPoint on the ground that it
    ignored the “unique role” of section 36.054 in the ratemaking context. 
    Id. at *122-23.
    We explained
    that were we to adopt the construction urged by the Joint Intervenors, we would forever deny a
    utility’s right to recover its CWIP expenses—a result not contemplated by the legislature when
    it allowed utilities to recover “all” of their stranded costs. See 
    id. at *123-24
    (citing Tex. Util.
    (b)      Construction work in progress may not be included in the rate base for a
    major project under construction to the extent that the project has been
    inefficiently or imprudently planned or managed.
    Tex. Util. Code Ann. § 36.054.
    20
    Section 39.260 states:
    (a)      The definition and identification of invested capital and other terms used in
    this subchapter and Subchapter G that affect the net book value of generation
    assets and the treatment of transactions performed under Section 35.035 and
    other transactions authorized by this title or approved by the regulatory
    authority that affect the net book value of generation assets during the freeze
    period shall be treated in accordance with generally accepted accounting
    principles as modified by regulatory accounting rules generally applicable to
    utilities.
    Tex. Util. Code Ann. § 39.260.
    35
    Code Ann. § 39.252(a)). We also concluded that the plain language of section 39.260 did not
    incorporate the requirements of section 36.054 into the Commission’s determination of stranded
    costs because those requirements do not relate to any type of accounting rule or principle. 
    Id. Finally, we
    concluded that the Commission’s rule regarding stranded cost recovery includes CWIP
    in net book value but makes no mention of the requirements in section 36.054. 
    Id. at *125.
    Because
    the Joint Intervenors make the same arguments this Court previously rejected in CenterPoint,
    I would overrule Joint Intervenors’ issue six.
    D.      Excess Earnings/EMCs and Interest
    I next turn to the parties’ claims regarding excess earnings and excess mitigation
    credits. In their third issue, OPC/CCG argue that the Commission erred in failing to reduce TCC’s
    stranded cost recovery by TCC’s excess earnings in 1999-2001 as required by sections 39.254 and
    39.262(a) of the PURA. Additionally, the Joint Intervenors argue that the Commission erred in its
    failure to reduce net book value by the amount of excess mitigation credits paid to TCC’s affiliated
    retail electric provider—CPL Retail Energy. In a related claim, TCC argues that the district court
    erred in affirming the Commission’s order because the Commission required TCC to pay interest
    twice on the same excess earnings.
    The record reflects that TCC had $42,209,382 of excess earnings during 1999-2001.
    The Commission applied $860,765 as a reduction in the net book value of TCC’s generation assets
    as required under section 39.254 of the PURA. The remaining $41,348,617 of excess earnings was
    paid by TCC to its affiliated retail electric provider and other retail electric providers in the form of
    36
    excess mitigation credits. The record reflects that TCC paid $21,351,322 to its affiliated REP CPL
    Retail Energy.21 OPC/CCG contend that the entire amount of excess mitigation credits should be
    applied to reduce the net book value of TCC’s generation assets, thereby reducing TCC’s stranded
    cost recovery. The Joint Intervenors agree, but they also argue in the alternative that, at a minimum,
    the Commission should have reduced TCC’s stranded cost recovery by the amount of excess
    mitigation credits paid to CPL Retail Energy.
    This Court considered claims similar to those raised by OPC/CCG and the Joint
    Intervenors in CenterPoint. See 2008 Tex. App. LEXIS 2819, at *85-101. We held that allowing
    the utility to recover as stranded costs the amounts paid to its affiliated REP would allow the utility
    to overrecover stranded costs in violation of section 39.262(a). 
    Id. at *98-100.
    We explained that
    section 39.262 of the PURA requires the Commission to treat the electric utility and its affiliated
    REP as one entity for the purpose of stranded cost recovery. 
    Id. at *98-99.
    Therefore, to the extent
    a utility’s affiliated REP was allowed to retain excess mitigation credits, the utility could not recover
    that amount as stranded costs because allowing such a recovery would result in an overrecovery of
    stranded costs in violation of section 39.262(a). 
    Id. at *99-100.
    Adhering to this Court’s decision in CenterPoint, I would conclude that the
    Commission erred in allowing TCC to recover as stranded costs those amounts paid to CPL Retail
    Energy as excess mitigation credits, but consideration of these claims must also take into account
    this Court’s prior decision in City of Corpus Christi v. Public Utility Commission, 
    188 S.W.3d 681
    (Tex. App.—Austin 2005, pet. denied). In City of Corpus Christi, this Court held that the
    21
    CPL Retail Energy received a total of $29,616,249, including interest of $8,264,927.
    37
    Commission exceeded its statutory authority when it ordered TCC to pay excess mitigation credits
    in the first 
    instance. 188 S.W.3d at 689
    . The supreme court denied the Commission’s petition for
    review on April 29, 2007—more than one year after the Commission’s final order in the instant true-
    up proceedings. Accordingly, we are called upon to reconcile our earlier decision in City of Corpus
    Christi with our more recent decision in CenterPoint, and the Commission’s final order in TCC’s
    true-up proceedings.
    This analysis begins with the Commission’s final order. Finding that the appellate
    process in City of Corpus Christi was “not yet complete,” the Commission “decline[d] to provide
    for [an] adjustment [to TCC’s stranded costs] in this Order.” Stated differently, the Commission did
    not consider the effects of our decision in City of Corpus Christi, much less our recent decision in
    CenterPoint, when it finalized TCC’s stranded costs in the instant true-up proceeding. Because the
    Commission should be given the opportunity to consider the effects of our decisions in City of
    Corpus Christi and CenterPoint in the first instance,22 I would reverse the district court’s judgment
    to the extent it affirmed the Commission’s order regarding the treatment of excess mitigation credits,
    and remand this issue, including the claims raised in OPC/CCG’s issue three and Joint Intervenors’
    issue ten, to the Commission for further proceedings.
    For the same reasons, I would reverse the district court judgment to the extent it
    affirmed the Commission’s order regarding the treatment of interest as it relates to the payment of
    22
    The legislature has charged the Commission with the task of finalizing each utility’s
    stranded costs. See Tex. Util. Code Ann. § 39.262(c).
    38
    excess mitigation credits, and remand this issue, including the claim raised in TCC’s issue three, to
    the Commission for further proceedings.
    E.      Interest on Stranded Costs
    In its final judgment, the district court concluded that the Commission “erred in
    applying Rule [16 Tex. Admin. Code §] 25.263 to determine the interest rate on stranded costs,
    because the Supreme Court invalidated the rule in [CenterPoint Energy].” Both the Commission
    and TCC appeal this portion of the district court’s judgment. Because I conclude that the supreme
    court’s decision in CenterPoint Energy did not invalidate that portion of the rule regarding the
    interest rate, I would reverse the judgment of the district court. 
    See 143 S.W.3d at 84
    .
    The Commission’s true-up rule in effect at the time, PUC Substantive Rule 25.263,
    provided in relevant part:
    The TDU shall be allowed to recover, or shall be liable for, carrying costs on the
    true-up balance. Carrying costs shall be calculated using the cost of capital
    established in the utility’s UCOS proceeding, and shall be calculated for the period
    of time from the date of the true-up final order until fully recovered.
    26 Tex. Reg. 10498, 10525 (2001) (Pub. Util. Comm’n) (codified as amended at 16 Tex. Admin.
    Code § 25.263(l)(3)). The rule states that the proper interest rate to be applied to a utility’s stranded
    39
    costs is the cost of capital established in the utility’s UCOS proceeding.23 
    Id. This interest
    rate was
    not at issue before the supreme court in CenterPoint Energy.
    In CenterPoint Energy, the supreme court declared “that Rule 25.263(l)(3) is 
    invalid.” 143 S.W.3d at 99
    . At first glance, this statement would appear to invalidate the entire rule, including
    that portion of the rule regarding the interest rate to be applied to a utility’s stranded costs. Upon
    closer examination of the supreme court’s opinion, however, I am not persuaded that the supreme
    court spoke so broadly.
    It is clear from the supreme court’s opinion that the only issue before the court in
    CenterPoint Energy was the date on which a utility begins to accrue interest on its stranded cost
    balance. As originally adopted, the Commission’s rule provided that a utility did not begin to accrue
    interest on its stranded costs until the Commission issued a final order in the utility’s stranded
    cost true-up proceeding. 26 Tex. Reg. at 10525; see also CenterPoint 
    Energy, 143 S.W.3d at 83
    .
    The supreme court determined that the Commission’s rule was invalid because it was inconsistent
    with the legislative intent that a utility recover all of its net, verifiable, non-mitigable stranded costs,
    “that ‘exist on the last day of the freeze period [December 31, 2001],’” which would include carrying
    costs from the first date of retail competition, or January 1, 2002. CenterPoint Energy, 
    143 S.W.3d 23
              The Commission established the proper interest rate to be applied to TCC’s stranded cost
    balance in TCC’s unbundled cost of service, or UCOS, proceeding. See Tex. Pub. Util. Comm’n,
    Application of Central Power & Light Company for Approval of Unbundled Cost of Service
    Rate Pursuant to PURA § 39.201 and Public Utility Commission Substantive Rule § 25.344,
    Docket No. 22352 (Oct. 5, 2001) (order), available at http://interchange.puc.state.tx.us (accessed
    June 13, 2008); see also Tex. Util. Code Ann. § 39.201 (West 2007); 16 Tex. Admin. Code § 25.344
    (2007). TCC witness Randall W. Hamlett testified that the cost of capital established in TCC’s
    UCOS proceeding was 11.7951%. This was the rate adopted by the Commission to calculate interest
    on TCC’s stranded costs.
    40
    at 84 (quoting Tex. Util. Code Ann. § 39.201(g)). Thus, despite its broad statement that rule
    25.263(l)(3) was invalid, it is clear from the text of the supreme court’s opinion that the court only
    invalidated that portion of the rule relating to the date on which carrying costs, or interest, began to
    accrue. See 
    id. Furthermore, the
    Commission’s rules have a severability clause. See 16 Tex. Admin.
    Code § 25.3 (2007) (Pub. Util. Comm’n). The severability clause states,
    If any provision of this chapter is held invalid, such invalidity shall not affect other
    provisions or applications of this chapter which can be given effect without the
    invalid provision or application, and to this end, the provisions of this chapter are
    declared to be severable.
    
    Id. § 25.3(a).
    To determine whether it is proper to sever that portion of rule 25.263 invalidated by
    the supreme court in CenterPoint Energy from the remainder of the rule we apply a two-prong test:
    (1)     will the function of the regulatory statute as a whole be impaired without the
    invalid part of the rule; and
    (2)     is there any indication that the agency would not have adopted the rule but for
    the invalid part?
    See Texas Dep’t of Banking v. Restland Funeral Home, Inc., 
    847 S.W.2d 680
    , 683
    (Tex. App.—Austin 1993, no writ) (citing K Mart Corp. v. Cartier, Inc., 
    486 U.S. 281
    , 294-95
    (1988)). If, in the court’s view, the answer to either inquiry is “yes,” then severance is not justified
    and the entire rule must fall. 
    Id. 41 Applying
    this test in the context of rule 25.263(l)(3), I would conclude that severance
    is justified. The function of the rule as a whole will not be impaired without the invalid part of the
    rule, and there is no indication that the Commission would not have adopted the rule but for the
    portion invalidated by the supreme court. See 
    id. I would
    sustain the Commission’s issue two and
    TCC’s issue four, reverse the district court’s judgment, and render judgment affirming the
    Commission’s final order on this issue.
    F.      Evidentiary Ruling
    In its third issue on appeal, the Commission seeks reversal of that portion of
    the district court’s judgment finding that the Commission erred in striking the expert report of
    Ross A. Sollosy, a consultant hired to advise the Commission and paid for by the Commission. The
    Joint Intervenors also appeal the district court’s judgment on this issue. For the reasons that follow,
    I agree with the Commission and the Joint Intervenors that the district court’s judgment was in error.
    This Court reviews the Commission’s decision to admit or exclude evidence for abuse
    of discretion—the same standard we apply to trial courts. City of Amarillo v. Railroad Comm’n,
    
    894 S.W.2d 491
    , 495 (Tex. App.—Austin 1995, writ denied). An agency has broad discretion
    when deciding whether to admit expert testimony in an administrative hearing, and its decision will
    not be disturbed absent an abuse of discretion. Fay-Ray Corp. v. Texas Alcoholic Bev. Comm’n,
    
    959 S.W.2d 362
    , 367 (Tex. App.—Austin 1998, no pet.).
    The record reflects that Sollosy and his firm Navigant were hired to advise the
    Commission and its staff regarding TCC’s sale of its share of the STP and other generation assets.
    42
    During the hearing before the Commissioners, Commission staff introduced Sollosy’s expert
    report into evidence. In addition, TCC introduced excerpts from Sollosy’s deposition testimony, a
    deposition exhibit, and Sollosy’s expert report. TCC’s introduction of Sollosy’s testimony, exhibit,
    and report was cumulative of other evidence and testimony provided by other TCC witnesses. After
    Sollosy’s testimony and report were introduced into evidence, it was discovered that Navigant,
    in its responses to the parties’ requests for information (RFIs), had failed to produce documents
    responsive to the parties’ RFIs. Initially, the Commissioners asked Sollosy to review his RFI
    responses and supplement them as necessary. Several days later, Navigant’s general counsel
    appeared unexpectedly at the hearing and disclosed more extensive problems. He admitted that
    Navigant’s responses to the RFIs were misleading and incomplete because several boxes of material
    related to Navigant’s prior involvement with electric generation asset sales, as well as information
    relied upon by Sollosy in forming his opinions regarding TCC’s asset sales and preparing his expert
    report, had not been produced. Navigant’s general counsel indicated that there were potentially sixty
    to one hundred boxes of responsive materials that had not been produced. He stated that these
    documents were, at the time, being pulled from a warehouse and reviewed and redacted and that they
    would be available in Austin in a week.24
    In response to this development, various intervenors moved to strike Sollosy’s
    testimony and expert report because they had not had the opportunity to review these documents in
    preparation of their case before cross-examining Sollosy. The Commission granted the motion to
    24
    The record reflected that some of the documents relating to Navigant’s prior experience
    in the sale of generation assets had been returned to its clients and that copies were not kept.
    Navigant’s general counsel stated that Navigant could “probably get them back.”
    43
    strike.25 As a result of this decision, the Commission struck, among other exhibits, TCC Exhibit 28,
    including excerpts from Sollosy’s deposition testimony, a deposition exhibit, and Sollosy’s
    expert report.
    TCC argues on appeal that we should affirm the district court’s judgment reversing
    the Commission’s decision to exclude TCC Exhibit 28 because the Commission’s decision was
    contrary to its own sanctions rule and the rules of civil procedure because it was a sanction “against
    TCC” even though TCC was not the offending party. I disagree.
    The Commission’s rule regarding sanctions for discovery abuse expressly allows the
    Commission to strike “pleadings or testimony, or both, in whole or in part” as a remedy for discovery
    abuse. 16 Tex. Admin. Code § 22.161(c)(8), (d) (2007) (Pub. Util. Comm’n). The Commission’s
    decision to exclude Sollosy’s testimony and expert report was not a sanction “against TCC.” Sollosy
    was a witness for Commission staff, not TCC. Thus, if anything, excluding Sollosy’s testimony
    was a sanction against Commission staff, not TCC. Furthermore, the record reflects that TCC
    provided additional testimony from various witnesses addressing the same issues addressed by
    Sollosy—namely, whether the sale of TCC’s share of the STP was a bona fide third-party sale under
    a competitive offering in compliance with section 39.262(h) of the PURA, whether the price TCC
    received for its share of the STP was reasonable, and whether the bundling of TCC’s Coleto Creek
    plant with other facilities was commercially reasonable. This evidence demonstrates that Sollosy’s
    testimony and expert report were merely cumulative. In light of the fact that Sollosy’s testimony and
    25
    I disagree with TCC’s assertion on appeal that the Commission did not strike the Cities’
    exhibits of Sollosy’s testimony because the hearing transcript reflects that Sollosy’s testimony and
    report were struck for all purposes except for TCC’s offer of proof.
    44
    expert report were cumulative of other evidence introduced by TCC, I cannot conclude that the
    Commission’s decision violated its own sanctions rule, much less that the Commission abused its
    discretion in striking Sollosy’s testimony and report.
    For the same reasons, even if the rules of civil procedure apply to discovery in
    Commission proceedings, I cannot conclude that the Commission’s decision to strike Sollosy’s
    testimony and report was contrary to those rules. Like the Commission’s rule regarding sanctions
    for discovery abuse, the rules of civil procedure give courts the discretion to exclude evidence as a
    sanction for discovery abuse. See, e.g., Tex. R. Civ. P. 193.6(a), 215.2(b)(4). Because Sollosy was
    a witness for Commission staff, not TCC, and his testimony and report were cumulative of other
    evidence offered by TCC, I would conclude the Commission’s decision striking Sollosy’s testimony
    and report comports with the rules of civil procedure and was not an abuse of discretion.26
    Therefore, I would sustain the Commission’s third issue and Joint Intervenors’ eighth issue, reverse
    that portion of the district court’s judgment finding that the Commission erred in striking Sollosy’s
    testimony and expert report, and render judgment affirming the Commission’s decision excluding
    Sollosy’s testimony and expert report.
    G.      PUC Treatment of TCC’s Tax Accounts
    In its second issue on appeal, TCC argues that the district court erred in upholding
    26
    I would also reject TCC’s argument that the exclusion of TCC Exhibit 28 was harmful
    error because TCC fails to address the cumulative nature of Sollosy’s testimony and expert report.
    To establish harm as to the exclusion of evidence, TCC must demonstrate that the excluded evidence
    was both controlling on a material issue and not cumulative of other evidence. See Williams Distrib.
    Co. v. Franklin, 
    898 S.W.2d 816
    , 817 (Tex. 1995).
    45
    the Commission’s treatment of TCC’s federal tax accounts for Accumulated Deferred Investment
    Tax Credits (ADITC) and Excess Deferred Federal Income Tax (EDFIT) because of the threat of
    “normalization violations.”27 TCC requests this Court to reverse the district court’s judgment and
    remand this issue to the Commission for further consideration. The Commission joins in this request
    asserting that federal tax law regarding normalization violations is in flux. The Joint Intervenors
    dispute whether a remand to the Commission is appropriate and argue that the district court properly
    rejected the request for a remand to the Commission.
    This Court recently addressed a similar issue in CenterPoint. See CenterPoint,
    2008 Tex. App. LEXIS 2819, at *105-18. In that case, we affirmed the Commission’s treatment of
    CenterPoint’s ADITC and EDFIT accounts and the Commission’s related reductions to
    CenterPoint’s stranded cost recovery, see 
    id. at *115;
    however, we remanded the issue for the
    Commission to consider whether it was appropriate to provide a remedy in the event that the IRS
    later determined that a normalization violation had occurred. 
    Id. at *117-18.
    For the same reasons
    expressed in CenterPoint, I would affirm the Commission’s treatment of TCC’s ADITC and EDFIT
    accounts, but I would also conclude that a remand is appropriate for the Commission to consider the
    effects of the IRS’s private letter ruling issued to TCC after the close of evidence before the
    Commission. Therefore, I would reverse that portion of the district court’s judgment affirming the
    Commission’s decision not to consider the effects of the private letter ruling issued to TCC, and
    remand this cause back to the Commission for further proceedings.
    27
    A normalization violation is essentially a violation of the tax accounting regulations of the
    Internal Revenue Service. See CenterPoint, 2008 Tex. App. LEXIS 2819, at *109-10 (discussing
    normalization violations).
    46
    H.      Capacity Auction True-up
    In addition to determining TCC’s stranded costs, the legislature charged the
    Commission with reconciling TCC’s capacity auction true-up award. See Tex. Util. Code Ann.
    § 39.262(d). TCC sought a capacity auction true-up award of $482,664,890, which the Commission
    reduced by $420,695,372. The district court affirmed the Commission’s reduction to TCC’s
    proposed capacity auction true-up award. On appeal, TCC argues that the district court’s judgment
    should be reversed because the Commission’s reduction was “unsupported by substantial evidence,
    arbitrary and capricious, grossly excessive, disproportionate to any downward bias from alleged
    deficiencies in TCC’s capacity auction process, and reaches a completely unreasonable result.”
    I disagree.28
    To ensure the availability of power to all retail competitors in the newly deregulated
    market, the legislature required each electric utility, including power generation companies, to
    auction off entitlements to “at least 15 percent” of the electric utility’s installed generation capacity.
    See Tex. Util. Code Ann. § 39.153(a) (emphasis added). The Commission concluded, and no one
    disputes, that TCC failed to auction entitlements to at least 15% of its installed generation capacity
    during 2002 and 2003. The dispute centers upon whether TCC satisfied the requirements of the
    relevant “safe-harbor” provisions and, therefore, could be deemed to have met the 15% statutory
    requirement or, if not, to what award, if any, TCC was entitled.
    28
    TCC and the Commission had a fundamental disagreement about how to interpret the
    relevant provisions in the PURA and the Commission’s rules regarding TCC’s statutory obligation
    to auction capacity.
    47
    As part of the transition to a competitive retail electric market, the legislature required
    each formerly bundled utility to auction off 15% of its installed generation capacity before and after
    the date on which customer choice began—January 1, 2002. See Tex. Util. Code Ann. § 39.153(a),
    (b). These auctions were designed to encourage retail competition by providing a source of power
    to new competitors in the market. See CenterPoint, 2008 Tex. App. LEXIS 2819, at *126-27;
    Reliant 
    I, 101 S.W.3d at 137
    . The legislature also directed the Commission to adopt rules defining
    the scope of the capacity entitlements to be auctioned and the procedures to be followed.29 See
    Tex. Util. Code Ann. § 39.153(e)-(g); 16 Tex. Admin. Code § 25.381 (2007) (Pub. Util. Comm’n).
    Pursuant to the Commission’s rule, the auctions were to be held four times a year, 16 Tex. Admin.
    Code § 25.381(h)(1)(A)(i), and the utilities were obligated to sell entitlements to four types
    of capacity products: baseload, gas-intermediate, gas cyclic, and gas-peaking. 
    Id. § 25.381(c)(5),
    (f)-(g). The amount of each type of product to be sold varied depending on the utility’s generation
    assets, but the total amount of entitlements sold had to equal at least 15% of the utility’s total
    generation capacity. 
    Id. § 25.381(e)(1).
    If a utility failed to auction off at least 15% of its generation capacity, it could still
    be deemed to have met this requirement if it satisfied the safe-harbor provisions established
    by the Commission. The Commission established two safe-harbor provisions that are relevant
    to this appeal. First, under the Commission’s capacity auction rule, a utility will be deemed to
    have met the 15% requirement if it offered products in a product category and successfully sold
    29
    The Commission adopted PUC Substantive Rule 25.381. See 16 Tex. Admin. Code
    § 25.381 (2007) (Pub. Util. Comm’n).
    48
    all of the entitlements offered in at least one month in that category. 
    Id. § 25.381(h)(1)(B)(iv);
    see
    also 
    id. § 25.381(h)(7)(C).30
    If there is no month in which all of the products in a given category
    were sold, the company must make a proposal to the Commission to meet the 15% requirement.
    16 Tex. Admin. Code § 25.381(h)(7)(C).            This safe-harbor provision became part of the
    Commission’s capacity auction rule in June 2002, and therefore only relates to capacity auctions
    in 2003.
    Second, the Commission approved a settlement in two proceedings—PUC Docket
    Nos. 23774 and 24888—adopting a capacity-auction-mechanics document that included a safe-
    harbor provision applicable for certain capacity auctions in 2002. The Commission determined that
    this safe-harbor provision was “significantly different” than the safe-harbor provision established
    in the Commission’s rule. To satisfy this safe-harbor provision, a utility must sell all of its offered
    entitlements in a given month. If, in a given month, all entitlements are not sold, the utility must
    propose to auction additional entitlements to the products that did sell in order to meet the 15%
    requirement. This safe-harbor provision allows a utility to remedy its failure to sell sufficient
    products only by offering additional entitlements for the products that did sell. In contrast, the safe-
    harbor provision in the Commission’s capacity auction rule is product-specific and requires the
    utility to sell all of the entitlements offered in at least one month for each product category. To
    remedy a deficiency under the rule’s safe-harbor provision, the utility may propose to modify the
    product’s offering price or the product category, or it may offer alternative capacity products.
    30
    The same safe-harbor provision appears in both of these portions of the Commission’s
    capacity auction rule.
    49
    In addition, the safe harbors established in Docket Nos. 23774 and 24888 have only
    limited applicability. The capacity-auction-mechanics document in Docket No. 23774 applies only
    to the initial auction—i.e., the September 2001 auction. The capacity-auction-mechanics document
    adopted in Docket No. 24888 contains the same limiting language. Because Docket No. 24888
    addressed only the mechanics of two auctions held in March 2002 and July 2002, the safe-harbor
    provision from Docket No. 24888 only applies to the initial auction in 2002—i.e., the March 2002
    auction.
    1.      TCC’s compliance with the 15% requirement
    In its first argument on appeal, TCC contends that it should not “be required to do the
    impossible—successfully sell products that the market does not want.” TCC complains that the
    Commission required the auction of four specific products that were defined in minute detail at
    minimum prices established by the Commission and that to construe section 39.153 of the PURA
    in a manner that requires TCC to successfully sell at auction 15% of these Commission-designed,
    Commission-priced products is unreasonable and leads to absurd results. Stated differently, TCC
    argues that it should not be held to the 15% requirement in section 39.153 because the market did
    not want the products that were to be sold at auction. In support of this argument, TCC claims that
    none of the other utilities required to conduct capacity auctions were successful at selling
    “unmarketable” products.
    I am unpersuaded by this argument. The language in section 39.153(a) is clear
    and unambiguous: it requires each utility to sell “at least 15 percent” of its generation capacity.
    50
    Tex. Util. Code Ann. § 39.153(a). Moreover, section 39.153(e) charges the Commission with
    authority to define the scope of capacity entitlements to be auctioned. 
    Id. § 39.153(e).
    Although this
    section gives some guidance to the Commission,31 the legislature left it to the Commission’s
    discretion to determine the types of capacity entitlements to be auctioned. 
    Id. And TCC
    does not
    argue that the Commission-designed products did not meet the requirements of section 39.153(e).
    Rather, TCC argues that the products were “unmarketable.” TCC, perhaps recognizing the fallacy
    of its own argument, dismisses it with the statement that “TCC was not required to meet
    this impossible requirement because TCC satisfied the applicable ‘safe harbor provisions.’” I would
    reject the notion that TCC was not required to satisfy the 15% requirement in section 39.153(a).
    31
    Sections 39.153(e)(1)-(5) provide that the entitlements:
    (1)      may be sold and purchased in periods of not less than one month nor more
    than four years;
    (2)      may be resold to any lawful purchaser, except for a retail electric provider
    affiliated with the electric utility that originally auctioned the entitlement;
    (3)      include no possessory interest in the unit from which the power is produced;
    (4)      include no obligations of a possessory owner of an interest in the unit from
    which the power is produced; and
    (5)      give the purchaser the right to designate the dispatch of the entitlement,
    subject to planned outages, outages beyond the control of the utility operating
    the unit, and other considerations subject to the oversight of the applicable
    independent organization.
    Tex. Util. Code Ann. § 39.153(e)(1)-(5).
    51
    2.      TCC’s compliance with safe-harbor provisions
    In its second argument on appeal, TCC argues that safe harbors existed during both
    2002 and 2003 and that TCC met the applicable safe-harbor provisions and, therefore, the
    Commission should have found that TCC satisfied the 15% requirement. As part of its argument,
    TCC contends that safe harbors existed for all of 2002 under the settlements adopted by the
    Commission in Docket Nos. 23774 and 24888. However, as previously discussed, the settlements
    adopted by the Commission in each of these dockets only applied to the initial auction addressed
    in each proceeding—i.e., the September 2001 and March 2002 auctions. See 
    discussion supra
    . The
    Commission concluded that TCC could only be deemed to have met its capacity auction obligation
    for 2002 if TCC met the requirements of the safe harbor for each of these two auctions.
    Accordingly, the Commission considered only whether TCC complied with the safe-harbor
    provisions for the September 2001 and March 2002 auctions.
    Examining TCC’s sales in the September 2001 auction, the Commission found that
    TCC failed to sell all of its offering in any one month covered by the September 2001 auction.32 In
    light of this failure, the safe-harbor provision in Docket No. 23774 required TCC to propose to
    the Commission a plan to sell all of its offering in any one month covered by the September 2001
    auction. Because TCC made no such proposal and continued to offer the same number of
    entitlements in its subsequent auctions, the Commission concluded that TCC failed to achieve the
    safe harbor for the September 2001 auction. And the Commission likewise concluded that TCC
    failed to achieve the safe harbor for capacity sold in 2002.
    32
    The Commission’s finding was based on the direct testimony of TIEC witness
    Jeffry Pollock.
    52
    As for 2003, the Commission examined whether TCC met the safe harbor stated in
    rule 25.381(h)(1)(B)(iv) and (h)(7)(C). The Commission determined that there was no single month
    in which TCC sold all of its offered gas-intermediate or gas-peaking products. Given this failure,
    the rule required TCC to propose to the Commission a plan to offer modified or different capacity
    products to meet its 15% obligation. TCC did so, and proposed to offer modified versions of these
    products, but even the modified products failed to sell in sufficient quantities. According to the
    testimony of TCC witness Michael Isenberg, TCC sold no additional gas-intermediate entitlements
    and only three of its four offered gas-peaking entitlements. TCC made no additional proposals.
    Thus, the Commission concluded that TCC failed to satisfy the safe harbor established in the
    Commission’s rule for capacity sold in 2003.33
    Having reviewed the record, I would conclude that the Commission’s determinations
    that TCC failed to satisfy the applicable safe harbor in either 2002 or 2003 was supported by
    substantial evidence and was neither arbitrary nor capricious.
    3.      TCC’s obligation to sell one- and two-year strips
    In addition to its failure to sell the amount of capacity required by the PURA and the
    Commission’s rules, the Commission also determined that TCC failed to sell products over the terms
    required by the Commission’s capacity auction rule. The Commission’s rule required TCC to offer
    33
    With respect to 2003, TCC argues that the Commission’s determination was flawed
    because the Commission improperly included TCC’s mothballed plants as part of TCC’s total
    generation capacity. This argument is not relevant because the record demonstrates that TCC failed
    to meet its 15% obligation in 2003 regardless of whether TCC’s mothballed capacity was included
    or excluded. Indeed, the record shows, and the Commission concluded, that TCC sold only 5% of
    its capacity in 2003, if the mothballed capacity is included, and only 8%, if the mothballed capacity
    is excluded.
    53
    entitlements to capacity products for various time periods. Of the total number of entitlements
    offered by the utility, approximately 20% must be auctioned as two one-year strips for 2002 and
    2003, with the strips offered jointly. See 16 Tex. Admin. Code § 25.381(h)(3)(A)(i). An additional
    30% of the entitlements must be in the form of one-year strips for 2002. 
    Id. § 25.381(h)(3)(A)(ii).
    The remainder of the utility’s offered capacity must be in the form of discrete months for 2002. 
    Id. § 25.381(h)(3)(A)(iv)
    and (v). No one disputes that TCC failed to offer one-year or two-year strips
    during its initial capacity auction. TCC witness Isenberg testified that TCC offered the equivalent
    amount of capacity in terms of discrete months because, as part of the settlement resolving the AEP-
    CSW merger proceeding, TCC had agreed to sell several plants constituting 1354 MW of capacity.
    TCC contended that its capacity auction notices stated that it was not offering strips and that neither
    the Commission nor any other party objected. TCC argued that the lack of an objection excused any
    failure to offer the strips. The Commission concluded that TCC’s failure to offer the strips violated
    the capacity auction rule and was not excused by TCC’s statements in the auction notices that it
    would not be offering the strips because the capacity auction rule plainly states that what is deemed
    approved in the event that no objection is made to the notice is the notice itself, not the substantive
    details of the auction. See 
    id. § 25.381(h)(2)(B)(i).
    TCC makes this same argument on appeal and argues that the very purpose of the
    notice is to provide the substantive details, not simply to provide notice without content. Even if one
    accepts TCC’s argument, that would not excuse TCC’s failure to meet the 15% requirement, much
    less its failure to satisfy the applicable safe harbor for 2002 or 2003. Therefore, it is irrelevant for
    purposes of this appeal whether the lack of objection to TCC’s notices excused its failure to offer
    the yearly strips or not.
    54
    4.     Calculation of TCC’s capacity auction true-up award
    The Commission concluded that TCC capacity auctions fell substantially short of
    TCC’s obligations under the PURA and the Commission’s capacity auction rule. Specifically, TCC
    failed to sell 15% of its generation capacity as required in section 39.153; TCC failed to achieve safe
    harbor in either 2002 or 2003; and TCC failed to offer approximately half of its capacity entitlements
    in the form of yearly strips as required by rule 25.381. These defects in TCC’s capacity auctions
    required the Commission to determine an alternative proxy for the capacity auction price to be used
    in the capacity auction true-up formula stated in the Commission’s rule.
    (A)     Commission authority to develop an alternative calculation method
    This Court considered a utility’s failure to comply with the statutory capacity auction
    requirements in CenterPoint. See CenterPoint, 2008 Tex. App. LEXIS 2819, at *126-61. In
    that case, we reversed the district court’s judgment and affirmed the Commission’s final order
    disallowing $440 million of CenterPoint’s requested capacity auction true-up award. 
    Id. at *24,
    *160-61, *196. Like TCC, CenterPoint had failed to comply with the statutory requirements
    to auction 15% of its generation capacity and likewise failed to satisfy the applicable safe-harbor
    provisions.   See 
    id. at *126-161.
         This Court held that, in light of CenterPoint’s failures,
    the Commission acted within its authority when it used an alternative method for establishing
    the capacity auction price to calculate CenterPoint’s capacity auction true-up award. 
    Id. at *126-61,
    *196.
    55
    TCC presents the same arguments this Court rejected in CenterPoint. First, as
    previously discussed, TCC argues that it should not be held to the 15% obligation because there was
    simply no market for the products designed and priced by the Commission to be sold at auction. In
    other words, TCC argues that the failure to satisfy the 15% requirement was due to factors outside
    of its control. This Court rejected the same argument in CenterPoint, finding that by specifying what
    products were to be sold and for what amount, the Commission was doing exactly as the legislature
    had instructed it to do. 
    Id. at *150-52;
    see also Tex. Util. Code Ann. § 39.153(e) (requiring the
    Commission to determine the scope of entitlements to be offered and the minimum amount of
    capacity to be auctioned), (f) (requiring the Commission to establish procedures for the auctions,
    including designating which generation units are offered and establishing an opening bid price).
    Moreover, the Court recognized that, although CenterPoint expressed dissatisfaction with the
    Commission’s actions on appeal, CenterPoint had failed to challenge the products or the price
    specified in the Commission’s capacity auction rule within the time period authorized by statute.
    See CenterPoint, 2008 Tex. App. LEXIS 2819, at *151-52 (citing Tex. Util. Code Ann. § 39.001(f)).
    Like CenterPoint, TCC has failed to show that it objected to the products or the price specified in
    the Commission’s rule. For the same reasons expressed by this Court in CenterPoint, I would reject
    TCC’s argument that its failure to satisfy the 15% requirement was due to factors beyond its control.
    Second, TCC argues that any reduction to its proposed capacity auction true-up award
    was improper because TCC substantially complied with the applicable safe-harbor provisions.
    Again, the Court rejected this argument in CenterPoint. See 
    id. at *145-49.
    The Court explained
    that the legislative goal of the capacity auction was to have each utility auction at least 15% of its
    56
    generation capacity. 
    Id. at *146-47.
    Moreover, the legislature’s use of the phrase “at least” was
    some indication that the legislature thought 15% was the absolute minimum amount of capacity
    that needed to be sold in order to determine an accurate estimate of the capacity auction price. 
    Id. at *147.
    Thus, the Court concluded that substantial compliance must ultimately be measured
    by comparison to this legislative goal, and not the Commission’s safe-harbor rule. 
    Id. Indeed, by
    establishing a safe-harbor provision, the Commission essentially determined what is necessary to
    establish substantial compliance with the legislative goal. 
    Id. at *148.
    For the reasons expressed
    in CenterPoint, I would conclude that TCC failed to substantially comply with the relevant
    requirements. See 
    id. Finally, TCC
    argues that the Commission’s reduction to TCC’s proposed capacity
    auction award was excessive when compared to what TCC considers to be minor deficiencies in its
    capacity auctions. TCC essentially argues that the PUC could have used simple mathematical
    calculations to determine “what would have happened” in TCC’s auctions in the absence of any
    deficiencies and that it was improper for the Commission to develop an alternative method for
    determining the “capacity auction price” to be used in the true-up formula when calculating TCC’s
    capacity auction true-up award. Although, in CenterPoint, we found the framing of this argument
    compelling, this Court rejected CenterPoint’s characterization of the reduction. 
    Id. at *155.
    The
    Court explained that the situation presented in this issue was similar to the one presented in the
    market valuation of CenterPoint’s generation assets. 
    Id. Because the
    relevant statutory provisions
    and the Commission’s rule assume the utility will comply with either the 15% requirement or with
    the safe harbor, neither one addresses the possibility of noncompliance. 
    Id. The Court
    concluded
    57
    that the Commission was caught between a statutory mandate requiring utilities be allowed to
    recover for their capacity auction costs and the utility’s noncompliance with the requirements
    necessary to determine an accurate award. 
    Id. Accordingly, in
    the absence of compliance, the Court
    found the Commission had the implied authority to develop an alternative method for determining
    the capacity auction price to be used in calculating CenterPoint’s true-up award. 
    Id. at *156.
    For
    the same reasons, I would conclude that the Commission had the implied authority to develop an
    alternative method for determining the capacity auction price to be used in calculating TCC’s
    capacity auction true-up award. It is therefore necessary to consider whether the Commission’s
    decision was supported by substantial evidence.
    (B)    Was the Commission’s calculation supported by substantial evidence?
    In its final order, the Commission considered various proxies proposed by the parties
    for use as the capacity auction price. TCC argued that the capacity price obtained in its auction
    should be used but, if the Commission determined a disallowance was appropriate, it should
    only make narrow adjustments to address the specific deficiencies of TCC’s capacity auctions.
    Alternatively, TCC proposed that the Commission use the Megawatt Daily ERCOT South Zone
    index to establish a proxy for TCC’s capacity auction price. According to TCC, use of this index
    would produce prices of $25.76/MWh for 2002 and $39.60/MWh for 2003, and would reduce TCC’s
    proposed capacity auction true-up award by approximately $90 million. In contrast, the intervenors
    argued that the proper adjustment was derived by use of TCC’s actual capacity and energy
    sales revenues for 2002 and 2003. Under this approach, TIEC determined that the appropriate
    58
    prices would be $42.50/MWh for 2002 and $48.01/MWh for 2003. The Commission adopted the
    approach and the proposed prices based on TCC’s actual revenues for 2002 and 2003 as urged
    by the intervenors.
    TCC argues that the prices adopted by the Commission are not supported by
    substantial evidence because there is no evidence that these prices represent competitive prices.
    TCC contends that these prices were not competitive because the evidence showed that they were
    based primarily on non-market revenues such as resource-must-run (RMR) contracts and sales to
    TCC’s affiliated retail electric provider. I disagree.
    The purpose of the capacity auctions as stated in the statute was to compare the actual
    prices received at auction with the prices in the 2001 ECOM model and award the difference
    to the utility. See Tex. Util. Code Ann. § 39.262(d)(2). Because the Commission determined
    and the record supports that TCC’s capacity auction was deficient in many respects, the Commission
    was unable to make the statutory comparison because it did not have actual prices received
    by TCC in the capacity auctions. Accordingly, the Commission was left to develop an alternative
    method for determining the prices that TCC would have received if it had performed a successful
    capacity auction.
    This Court addressed a similar situation in CenterPoint. See CenterPoint, 2008
    Tex. App. LEXIS 2819, at *137-38. Like TCC, CenterPoint also failed to comply with the statutory
    requirement to auction 15% of its generation capacity. 
    Id. Having performed
    a deficient capacity
    auction, the Commission could not use the prices obtained by CenterPoint in the capacity auctions
    to determine the capacity auction true-up. 
    Id. As a
    result, the Commission developed a proxy for
    59
    the capacity auction price by using the average price of all capacity products sold by CenterPoint.
    
    Id. This Court
    concluded there was a reasonable basis for the Commission’s decision to use a proxy
    for CenterPoint’s capacity auction price and that the Commission’s decision was consistent with the
    relevant statutory provisions. 
    Id. at *156-60.
    This Court affirmed the Commission’s calculation of
    CenterPoint’s capacity auction true-up award. 
    Id. at *160.
    Here, as in CenterPoint, the Commission used the average price of all TCC capacity
    sales during the relevant time period to determine the proxy for TCC’s capacity auction price. This
    was the approach urged by TIEC, the Cities, and OPC. TIEC witness Jeffry Pollock testified that
    using the average price of all of TCC’s capacity sales during the relevant time period would produce
    prices of $42.50/MWh for 2002 and $48.01/MWh for 2003. Cities witness Scott Norwood34 and
    OPC witness Randall Falkenberg also testified to this approach and calculated price figures that were
    very close to or identical to these prices.
    The Commission adopted the approach urged by the intervenors and agreed that using
    the average price of all capacity sales was consistent with the purpose of the capacity auction true-up
    to reconcile the utility’s actual results in the competitive market with the power price projections
    from the 2001 ECOM model. The Commission recognized that the problems with TCC’s capacity
    auction were substantial and were more significant than those identified by the Commission in
    34
    To the extent TCC complains that Norwood admitted that TCC’s revenues were
    “dominated” by what TCC alleges are non-competitive sales, TCC takes one statement from
    Norwood’s entire testimony out of context. The full record of Norwood’s testimony supports the
    approach urged by the intervenors. Moreover, the Commission was entitled to accept or reject any
    part or all of each expert’s testimony. City of Corpus Christi v. Public Util. Comm’n, 
    188 S.W.3d 681
    , 695 (Tex. App.—Austin 2005, pet. denied); Central Power & Light Co. v. Public Util. Comm’n,
    
    36 S.W.3d 547
    , 561 (Tex. App.—Austin 2000, pet. denied).
    60
    CenterPoint’s capacity auction. In particular, the Commission found that, by failing to sell sufficient
    quantities of products other than baseload, the results of TCC’s capacity auctions over-represented
    the lower baseload pricing and were, therefore, distorted downwards. The Commission further
    concluded that the approach urged by the intervenors was consistent with the approach the
    Commission took in the CenterPoint true-up and rejected TCC’s proposal to correct the deficiencies
    in TCC’s capacity auction on a “flaw-by-flaw” or “piecemeal” basis.
    Consistent with this Court’s opinion in CenterPoint, I would conclude that there is
    a reasonable basis in the record to support the Commission’s development of an alternative method
    for determining TCC’s capacity auction price. The simple fact that the Commission chose to use the
    method urged by the intervenors instead of that urged by TCC does not make the Commisison’s
    decision unreasonable. The method chosen by the Commission was reasonable and consistent with
    the relevant statutory provisions, and I would conclude that the Commission’s decision and
    calculation of TCC’s capacity auction true-up award was supported by substantial evidence. I would
    overrule TCC’s first issue.
    In a related issue, the Joint Intervenors assert that the district court erred by affirming
    the Commission’s decision to include interest on TCC’s capacity auction true-up award. The
    Commission determined that including interest on TCC’s capacity auction true-up was necessary to
    make the utility whole and was also consistent with the supreme court’s decision in CenterPoint
    
    Energy, 143 S.W.3d at 85
    . As recognized by the supreme court in CenterPoint Energy, the purpose
    of the capacity auction true-up was to ensure that the utility earned the same margins that were
    projected in the 2001 ECOM model. TCC was entitled to a capacity auction award because it did
    61
    not recover all of the predicted margins. Moreover, since those amounts will not be recovered until
    the true-up is complete, it necessarily follows that a time value for the delay must be added to make
    the utility whole. See 
    id. This is
    likewise consistent with this Court’s decision in Centerpoint. See
    2008 Tex. App. LEXIS 2819, at *161-70. Accordingly, for the reasons expressed in this Court’s
    CenterPoint opinion, I would overrule Joint Intervenors’ issue nine.
    III.   Conclusion
    Having considered all of the parties’ issues raised on appeal, I would affirm the
    district court’s judgment in part, reverse in part, and remand this cause to the Commission for further
    proceedings. Because the plain language of section 39.252(d) does not preclude the Commission’s
    adjustments to the net book value of TCC’s generation assets for commercial unreasonableness
    related to the sales of TCC’s share in the STP and the decision to bundle the Coleto Creek Coal Plant
    with other generation assets, I dissent from the majority’s conclusion that it does. I would reverse
    the district court’s judgment on this point and affirm the Commission’s reductions to net book value.
    __________________________________________
    Jan P. Patterson, Justice
    Before Justices Patterson, Puryear and Pemberton;
    Joined in part by Justices Puryear and Pemberton
    Filed: June 27, 2008
    62
    

Document Info

Docket Number: 03-07-00196-CV

Filed Date: 6/27/2008

Precedential Status: Precedential

Modified Date: 2/1/2016

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