Esi Energy, LLC v. Fed. Energy Regulatory Comm'n , 892 F.3d 321 ( 2018 )


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  •  United States Court of Appeals
    FOR THE DISTRICT OF COLUMBIA CIRCUIT
    Argued January 8, 2018                    Decided June 8, 2018
    No. 16-1342
    ESI ENERGY, LLC,
    PETITIONER
    v.
    FEDERAL ENERGY REGULATORY COMMISSION,
    RESPONDENT
    PJM INTERCONNECTION, L.L.C. AND WEST DEPTFORD
    ENERGY, LLC,
    INTERVENORS
    On Petition for Review of Orders of the
    Federal Energy Regulatory Commission
    Larry F. Eisenstat argued the cause and filed the briefs for
    petitioner.
    Nicholas M. Gladd, Attorney, Federal Energy Regulatory
    Commission, argued the cause for respondent. With him on
    the brief were David L. Morenoff, General Counsel, and Robert
    H. Solomon, Solicitor.
    Ashley C. Parrish argued the cause for intervenor for
    respondent West Deptford Energy, LLC. With him on the
    brief were Justin A. Torres, Neil L. Levy, and Stephanie S. Lim.
    2
    Before: MILLETT and WILKINS, Circuit Judges, and
    EDWARDS, Senior Circuit Judge.
    Opinion for the Court filed by Circuit Judge WILKINS.
    WILKINS, Circuit Judge: For a second time, we consider
    the ramifications of a utility filing more than one rate with the
    Federal Energy Regulatory Commission (“FERC” or the
    “Commission”) during the time in which the utility negotiates
    an agreement with a prospective customer. See W. Deptford
    Energy, LLC v. FERC, 
    766 F.3d 10
    (D.C. Cir. 2014).
    Specifically, we are asked to determine which rate governs: the
    rate in effect at the time negotiations commenced or the rate in
    effect at the time the agreement was completed. We are also
    asked to consider whether, if the rate on file at the time the
    agreement was completed governs, FERC reasonably
    interpreted the new rate.
    Upon review, we uphold FERC’s determination that the
    governing rate is the rate in effect at the time the agreement
    was completed. Because we find that FERC properly
    considered the Court’s findings on remand, adequately
    explained its decision, and properly considered the evidence,
    FERC did not act arbitrarily and capriciously in interpreting the
    new rate. We therefore deny the Petition for Review.
    I.
    The Federal Power Act, 16 U.S.C. §§ 791a et seq., charges
    the Commission with regulating “the transmission of electric
    energy” and “the sale of electric energy at wholesale” in
    interstate commerce, 
    id. § 824(b)(1).
    In exercising that
    authority, the Commission must ensure that “[a]ll rates and
    charges” for the “transmission or sale of electric energy subject
    to” its jurisdiction are “just and reasonable,” and that no public
    3
    utility’s rates are unduly discriminatory or preferential. 
    Id. § 824d(a),
    (b); see NRG Power Mktg., LLC v. Maine Pub. Utils.
    Comm’n, 
    558 U.S. 165
    , 167 (2010).
    To that end, the Act requires every public utility to “file
    with the Commission” and “keep open in convenient form and
    place for public inspection schedules showing all rates and
    charges for any transmission or sale subject to the jurisdiction
    of the Commission.” 16 U.S.C. § 824d(c). That obligation
    applies whether the rates and charges are set “unilaterally by
    tariff” or agreed upon in individual contracts between sellers
    and buyers. NRG Power 
    Mktg., 558 U.S. at 171
    . When a
    public utility seeks to change its filed rate, it must “fil[e] with
    the Commission . . . new schedules stating plainly the change
    or changes . . . and the time when the change or changes will
    go into effect.” 16 U.S.C. § 824d(d).
    The Federal Power Act’s express mandate of openness,
    transparency, and consistency in rates prevents discrimination,
    promotes fair and equal access to the utilities’ services, ensures
    the stability and predictability of rates, and reinforces the
    Commission’s jurisdictional authority. See Maislin Indus.,
    U.S., Inc. v. Primary Steel, Inc., 
    497 U.S. 116
    , 130-31 (1990);
    Consol. Edison Co. of N.Y. v. FERC, 
    347 F.3d 964
    , 969 (D.C.
    Cir. 2003); Consol. Edison Co. of N.Y. v. FERC, 
    958 F.2d 429
    ,
    432 (D.C. Cir. 1992).
    To foster competition in the wholesale energy market, the
    Commission drastically overhauled the regulatory scheme for
    public utilities in 1996. As part of that effort, the Commission
    ordered regulated utilities to separate financially their
    wholesale power-generation and power-transmission services.
    See Promoting Wholesale Competition Through Open Access
    Non-Discriminatory Transmission Services by Public Utilities;
    Recovery of Stranded Costs by Public Utilities and
    4
    Transmitting Utilities, Order No. 888, 61 Fed. Reg. 21,540
    (Apr. 24, 1996); see also New York v. FERC, 
    535 U.S. 1
    , 11
    (2002) (describing Order No. 888). Accordingly, public
    utilities must now file tariffs with the Commission establishing
    separate rates for wholesale power-generation service,
    transmission service, and any ancillary service. New 
    York, 535 U.S. at 11
    . In addition, they must “take transmission of [their]
    own wholesale sales and purchases under a single general tariff
    applicable equally to [themselves] and to others.” 
    Id. Problems soon
    arose, however, because every time a new
    generator of electricity asked to use a transmission network
    owned by another – to interconnect the two entities – disputes
    between the generator and the owner of the transmission grid
    would arise, delaying completion of the interconnection
    process. See Standardization of Generator Interconnection
    Agreements and Procedures, Order No. 2003, 104 FERC
    ¶ 61,103 at P. 11 (2003). The Commission waded into those
    disputes case by case, delaying entry into the market by new
    generators and providing an unfair competitive advantage to
    utilities owning both transmission and generation facilities. 
    Id. at PP.
    10-11.
    To address those issues, the Commission in 2003 issued
    Order No. 2003, 104 FERC at PP. 11-12. That order replaced
    the Commission’s case-by-case approach with a standardized
    process. The Order requires all regulated utilities that “own,
    control, or operate” transmission facilities to include
    standardized interconnection procedures and a form
    interconnection agreement in their filed tariffs. 
    Id. at P.
    2. By
    mandating that “standard set of procedures,” the Commission
    “minimize[d] opportunities for undue discrimination and
    expedit[ed] the development of new generation, while
    protecting reliability and ensuring that rates are just and
    reasonable.” 
    Id. at P.
    11.
    5
    II.
    A.
    PJM Interconnection, LLC (“PJM”), is a regional
    transmission organization, an independent entity that operates
    transmission facilities in thirteen states and the District of
    Columbia. See FPL Energy Marcus Hook, L.P. v. FERC, 
    430 F.3d 441
    , 442-43 (D.C. Cir. 2005). Under PJM’s Open Access
    Transmission Tariff (“PJM Tariff”), the interconnection
    process begins when a generator of electricity submits an
    interconnection request to PJM. W. 
    Deptford, 766 F.3d at 13
    .
    Each request is placed into a “first-come, first-served queue.”
    Marcus 
    Hook, 430 F.3d at 443
    ; see PJM Tariff § 201.
    The submission of an interconnection request triggers a
    review by the utility and holds the requestor’s place in the
    interconnection queue until it concludes. During this process,
    PJM conducts a series of studies to determine the impact of a
    generator interconnection request on the PJM transmission
    system, including the need for upgrades or additions to those
    transmission facilities, W. 
    Deptford, 766 F.3d at 14
    , and an
    estimate of the requestor’s cost responsibility for any needed
    upgrades, see Marcus 
    Hook, 430 F.3d at 443
    . Those studies do
    “not set a rate for interconnection service,” however; they
    merely provide “a non-binding estimate of costs.” Dominion
    Res. Servs., Inc. v. PJM Interconnection, LLC, 123 FERC
    ¶ 61,025 at P. 52 (2008). Customers are thus free to “terminate
    or withdraw their interconnection requests” at any time.
    Marcus 
    Hook, 430 F.3d at 443
    . Once PJM completes the
    studies, it provides the requestor with a proposed
    interconnection service agreement that “specifies the
    customer’s actual cost responsibility,” including the cost of any
    upgrades needed to PJM’s transmission network to sustain the
    increased demand. 
    Id. 6 While
    a new service request might be what prompts a
    network upgrade, the “integrated transmission grid is a
    cohesive network,” Entergy Servs., Inc., 96 FERC ¶ 61,311,
    ¶ 62,202 (2001), and thus completed upgrades generally
    “benefit all transmission customers,” Order No. 2003, 104
    FERC at P. 21. For that reason, those generators who have to
    pay for upgrades under the PJM Tariff receive incremental
    auction-revenue rights that give the generator the right to
    revenue from future sales of transmission services associated
    with the new or upgraded facility. See W. 
    Deptford, 766 F.3d at 14
    ; see also PJM Interconnection, LLC, 126 FERC ¶ 61,280,
    ¶ 62,589 (2009) (describing the function of auction-revenue
    rights). That auction revenue, in turn, partially compensates
    the generator for the financial burden of improving the
    transmission network for all users. See Order No. 2003, 104
    FERC at P. 694.
    In 1998, three generators submitted interconnection
    requests to PJM for the following projects: the Mantua Creek
    Project, the Liberty Electric Project, and the Marcus Hook
    Project. Order Denying Rehearing, PJM Interconnection, LLC,
    139 FERC ¶ 61,184 at P. 3 (2012) (“2012 Order”); Marcus
    
    Hook, 430 F.3d at 444
    . PJM determined that the projects’
    combined load would “push [its] system beyond the breaking
    point,” and thus advised a $13 million upgrade (the “Upgrade”
    or “Network Upgrade 28”) to a transmission circuit. Marcus
    
    Hook, 430 F.3d at 444
    . Because that Upgrade was unnecessary
    at the time the first project, Mantua Creek, entered the queue,
    Mantua Creek was not assigned any cost responsibility for the
    Upgrade. 
    Id. Marcus Hook
    and Liberty Electric bore it all,
    with 90% of the Upgrade’s cost assigned to Marcus Hook. See
    id.; see also 2012 Order at P. 3. Both generators moved
    forward with the project, with Marcus Hook agreeing to pay
    “over $10 million of the upgrade’s total cost.” Marcus 
    Hook, 430 F.3d at 444
    .
    7
    As the Upgrade neared completion, Mantua Creek
    unexpectedly cancelled its project and withdrew from the
    queue. See 2012 Order at P. 3. That decrease in the demand
    for power made the Upgrade unnecessary to support Marcus
    Hook’s and Liberty Electric’s projects. But PJM determined
    that completion of the almost-final Upgrade was the “least
    costly alternative,” and thus “trudged forward and completed
    the upgrade.” Marcus 
    Hook, 430 F.3d at 444
    . The Upgrade
    was placed into service in June 2003.
    Marcus Hook felt differently about being required to
    continue financing the Upgrade and filed a complaint with the
    Commission seeking a refund. Marcus 
    Hook, 430 F.3d at 444
    -45. The Commission rejected Marcus Hook’s complaint.
    See FPL Energy Marcus Hook, L.P. v. PJM Interconnection,
    LLC, 107 FERC ¶ 61,069 (2004) (Marcus Hook I), reh’g
    denied, 108 FERC ¶ 61,171 (2004) (Marcus Hook II). In 2005,
    this Court upheld the Commission’s decision in relevant part.
    Marcus 
    Hook, 430 F.3d at 447-49
    .
    The next year, West Deptford submitted an
    interconnection request to PJM. 2012 Order at P. 4. Under
    Section 37.7 of the PJM Tariff that was in effect on the date
    that West Deptford submitted its request (July 31, 2006), PJM
    could seek reimbursement for a previously constructed
    network upgrade from a new applicant for interconnection like
    West Deptford if the new proposed project (i) used the added
    capacity created by the upgrade or would have required the
    upgrade itself, (ii) the cost of the upgrade was at least $10
    million, and (iii) the upgrade was “placed in service no more
    than five years prior to the affected Interconnection Customer’s
    Interconnection Queue Closing Date.” W. 
    Deptford, 766 F.3d at 17
    (quotation marks and citation omitted).
    8
    Based on Section 37.7, PJM’s first study of West
    Deptford’s project proposed imposing financial responsibility
    for the Upgrade on West Deptford. See 2012 Order at PP. 5, 9;
    PJM Feasibility Study 8 (Nov. 2006). West Deptford did not
    dispute that, if the 2006 Tariff controls its interconnection
    agreement, it must reimburse Marcus Hook and Liberty
    Electric for the costs of the Upgrade. Order Accepting
    Interconnection Service Agreements, PJM Interconnection,
    LLC, 136 FERC ¶ 61,195 at P. 28 (2011) (“2011 Order”).
    Eighteen months later, while West Deptford’s
    interconnection request was still pending, PJM filed several
    proposed amendments to its tariff. 2012 Order at P. 11; see
    also Dominion, 123 FERC ¶ 61,025 at PP. 1-3 (settlement of
    administrative challenge to PJM Tariff resulted in proposed
    amendments).        One proposed amendment significantly
    changed Section 37.7’s assignment of financial responsibility
    for prior upgrades. Under Section 219 of the new 2008 tariff,
    PJM could seek reimbursement for previously constructed
    network upgrades only for a period of five years “from the
    execution date of the Interconnection Service Agreement for
    the project that initially necessitated the requirement for the
    Local Upgrade or Network Upgrade.” PJM Tariff § 219(a).
    While the tariff was silent about the effective date of that
    change, a transmittal letter from PJM noted that the next
    interconnection queue would begin on August 1, 2008, and
    then “request[ed] an August 1, 2008 effective date for these
    Tariff revisions.” PJM Transmittal Letter 17. Because Liberty
    Electric executed its interconnection agreement on May 14,
    2001, and Marcus Hook executed its agreement on January 22,
    2002, 2012 Order at P. 10, the Commission and PJM agreed
    that, if the 2008 tariff controls, then that tariff’s five-year time
    limit insulates West Deptford from having to pay for the
    Upgrade. 2011 Order at P. 34.
    9
    Proceedings commenced before the Commission
    challenging aspects of the 2008 tariff, but West Deptford was
    not a party. In those proceedings, PJM received an inquiry
    asking whether the new cost-allocation provisions would
    “apply only to projects that enter the interconnection queue on
    or after the proposed effective date of August 1, 2008 or
    whether they will apply also to projects that have entered the
    queue before that date.” Request for Clarification of American
    Municipal Power-Ohio, Inc. at 1, Dominion Res. Servs., Inc. v.
    PJM Interconnection, LLC, Docket No. EL08-36-001 (FERC
    June 20, 2008). PJM responded that one revised provision of
    the tariff not at issue here “will become effective on August 1,
    2008, and will be initially applied to the U2-Queue (this queue
    will close on July 31, 2008).” Answer of PJM Interconnection,
    LLC to Request for Clarification of American Municipal
    Power-Ohio, Inc. at 4, Dominion Res. Servs., Inc. v. PJM
    Interconnection, LLC, Docket No. EL08-36-001 (FERC July 7,
    2008). With respect to Section 219(a), the provision at issue
    here, PJM separately stated that “[t]hese modifications are
    intended to be effective as of August 1, 2008, and will be
    initially applied to the U2-Queue.” 
    Id. On August
    19, 2008, the Commission accepted PJM’s
    revised tariff, but referenced only PJM’s clarification of the
    effective date for the provision not relevant here, stating that
    Section 217.3a “will be applied to the U2-Queue effective
    August 1, 2008.” FERC Letter Order at 1, Dominion Res.
    Servs., Inc. v. PJM Interconnection, LLC, Docket No. EL08-
    36-001 (FERC Aug. 19, 2008). The Commission did not
    mention PJM’s clarification of the effective date for the
    provision at issue in this case, Section 219(a). See 
    id. Over the
    next three years, PJM conducted additional
    studies of West Deptford’s interconnection request. In these
    studies, PJM expressed its intention to charge West Deptford
    10
    the full $10 million for the Upgrade, as had been permitted by
    the superseded tariff. PJM System Impact Study Report 4-5
    (Sept. 2010); PJM Facilities Study Report 4, 10 (Apr. 2011).
    West Deptford claimed, and no one disputed, that it repeatedly
    objected to this attempted cost allocation.
    B.
    In 2011, PJM provided West Deptford a draft
    interconnection service agreement that imposed the full cost of
    the Upgrade on West Deptford. Mot. to Intervene & Protest of
    West Deptford Energy, LLC 9, PJM Interconnection, LLC,
    Docket No. ER11-4073-000 (FERC Aug. 8, 2011) (“West
    Deptford Protest”). West Deptford objected, 
    id., and PJM
    filed
    the unexecuted agreement with the Commission, seeking its
    resolution of the dispute. 2012 Order at P. 6. West Deptford
    argued, as relevant here, that imposing the superseded tariff’s
    terms for cost allocation violated both the filed rate doctrine
    and past Commission precedent enforcing the terms of tariffs
    that were in effect when an interconnection agreement was
    executed or filed, rather than when a prospective customer
    entered the queue. West Deptford Protest 15.
    The Commission rejected West Deptford’s protest.
    Acknowledging that West Deptford could not be liable for the
    Upgrade under the on-file tariff, the Commission nonetheless
    concluded that the cost-allocation provisions of the superseded
    tariff should govern “since, at the time when West Deptford
    entered the PJM interconnection queue, that provision was the
    one that established its financial responsibility.” 2011 Order at
    P. 35. According to the Commission, that fact put West
    Deptford “on notice of the costs to which it potentially would
    be liable.” 
    Id. at P.
    38.
    11
    West Deptford requested rehearing, which the
    Commission denied. The Commission said that PJM could
    enforce the superseded tariff’s cost-allocation rule because,
    during the tariff-revision proceedings to which West Deptford
    was not a party, PJM had clarified that the new tariff’s
    cost-allocation provision (Section 219) would only apply
    starting with projects in the “U2-Queue,” which closed in the
    Summer of 2008. 2012 Order at P. 31. The Commission also
    reasoned that each of PJM’s interconnection studies had
    provided West Deptford notice of PJM’s intent to enforce the
    superseded tariff’s cost-allocation provision. 
    Id. at P.
    28.
    Finally, with respect to past Commission precedent, the
    Commission stated that its decisions did not bind it to “a single
    policy to address all of the myriad issues that may arise from a
    change to cost allocation in the interconnection process.” 
    Id. at P.
    38.
    West Deptford timely petitioned for review, and PJM and
    Marcus Hook intervened. On review, this Court vacated the
    Commission’s orders in part and remanded the case because
    the Commission “provided no reasoned explanation for how its
    decision comport[ed] with statutory direction, prior agency
    practice, or the purposes of the filed rate doctrine.”
    W. 
    Deptford, 766 F.3d at 12
    .
    On remand, FERC reversed its prior position and
    concluded that Section 219 – the tariff provision in effect at the
    time the interconnection agreement was filed – applied to
    PJM’s assessment of costs to West Deptford because none of
    the evidence gave West Deptford sufficient notice that the old
    tariff would govern its interconnection agreement. Order on
    Remand, 153 FERC ¶ 61,327 at P. 14 (2015); Order on
    Rehearing, Compliance, and Clarification, 156 FERC ¶ 61,090
    at P. 11 (2016) (“Rehearing Order”). FERC based its decision
    on the “significant skepticism” this Court expressed “with [its]
    12
    determination that [the old tariff] should apply” and the
    “numerous shortcomings” the Court identified in the
    Commission’s analysis. Rehearing Order at P. 10.
    The Commission also determined that Section 219 was
    ambiguous as to what action needed to be taken within the
    prescribed five-year window in order to trigger cost
    responsibility, but concluded that the most reasonable
    interpretation was that the appropriate “end-date” was the date
    on which West Deptford signed its interconnection agreement.
    
    Id. at P.
    22. In doing so, the Commission rejected Marcus
    Hook’s argument that Section 219 should be interpreted such
    that an interconnection customer is liable for the cost of
    network upgrades that entered service during the five years
    preceding the customer’s queue-entry date. 
    Id. at PP.
    21-22.
    Marcus Hook 1 now contends that on remand the
    Commission acted arbitrarily and capriciously and did not
    engage in reasoned decisionmaking insofar as the Commission
    (1) determined that West Deptford’s responsibility to pay for
    the network upgrades was to be determined in accordance with
    PJM Tariff Section 219 rather than Section 37.7 and (2)
    adopted an interpretation of Section 219 that conflicts with
    FERC precedent, the evidence on which FERC relied, and the
    policies underlying the judicially recognized exceptions to the
    filed rate doctrine.
    1
    The Court previously granted ESI Energy’s motion to substitute
    itself for FPL Energy Marcus Hook, L.P. Doc. No. 1651533.
    However, to maintain consistency with the earlier proceedings and
    the parties’ briefing, this opinion refers to Petitioner as “Marcus
    Hook” instead of ESI Energy.
    13
    III.
    The Court reviews Commission orders under the
    arbitrary-and-capricious standard, and we will uphold the
    Commission’s factual findings if they are supported by
    substantial evidence. See 5 U.S.C. § 706(2); see also, e.g.,
    Sacramento Mun. Util. Dist. v. FERC, 
    616 F.3d 520
    , 528 (D.C.
    Cir. 2010) (per curiam). Under those standards, the Court must
    determine whether the Commission “examined the relevant
    data and articulated a rational connection between the facts
    found and the choice made.” Alcoa Inc. v. FERC, 
    564 F.3d 1342
    , 1347 (D.C. Cir. 2009) (internal alterations and citation
    omitted). While the Court defers to the Commission’s
    interpretation of its own precedent, NSTAR Elec. & Gas Corp.
    v. FERC, 
    481 F.3d 794
    , 799 (D.C. Cir. 2007), the Commission
    cannot depart from those rulings without “‘provid[ing] a
    reasoned analysis indicating that prior policies and standards
    are being deliberately changed, not casually ignored.’” 
    Alcoa, 564 F.3d at 1347
    (quoting Entergy Servs., Inc. v. FERC, 
    319 F.3d 536
    , 541 (D.C. Cir. 2003)). Our review of the
    Commission’s interpretation of filed tariffs is “Chevron-like in
    nature,” which means we give “substantial deference” to the
    Commission’s interpretation unless “the tariff language is
    unambiguous.” Old Dominion Elec. Co-Op., Inc. v. FERC, 
    518 F.3d 43
    , 48 (D.C. Cir. 2008) (internal quotation marks
    omitted).
    A.
    On remand, the Commission held that West Deptford’s
    responsibility to pay for the network upgrades was to be
    determined in accordance with PJM Tariff Section 219 rather
    than Section 37.7. To sustain that determination, the
    Commission was obligated to provide a reasoned explanation
    of how applying Section 219 comported with the text of the
    14
    Federal Power Act and prior Commission precedent. Unlike
    its prior decision, the Commission’s decision on remand did
    both.
    First, FERC reasonably relied on our decision in West
    Deptford to conclude, contrary to its prior finding, that it was
    “not sufficiently clear . . . that the projects in earlier queues
    would continue to be governed by section 37.7.” Order on
    Remand at P. 15. In its initial decision, the Commission found
    that Section 219 was plainly prospective based on PJM’s
    Transmittal Letter and PJM’s answer in Dominion, and thus
    that Section 37.7 governed West Deptford’s interconnection
    agreement. See generally 2011 Order; 2012 Order. In West
    Deptford, we concluded that both the letter and PJM’s answer
    in Dominion were 
    ambiguous. 766 F.3d at 18-19
    . As to the
    Transmittal Letter, we found that it was “silent about whether
    the date of the interconnection agreement or of entry into the
    queue had to fall on or after [August 1, 2008],” 
    id., and explained
    that the introductory clause – in which PJM noted
    that it requested August 1, 2008, as the effective date
    “[b]ecause the next interconnection queue will begin” on that
    date, PJM Transmittal Letter 17 – “simply add[ed] to the
    confusion about what must be in place by August 1st.” W.
    
    Deptford, 766 F.3d at 18-19
    . We similarly found that PJM’s
    answer in Dominion was “confusing,” because one sentence
    suggested prospectivity while another suggested the tariff
    would apply retrospectively.          
    Id. at 23.
         Under the
    circumstances, it was reasonable for FERC, on remand from
    this Court, to rely on these findings, and no additional
    explanation was needed to support its changed position.
    In light of this ambiguity and “an unbroken Commission
    practice of holding that interconnection agreements filed after
    the designated effective date of an amended tariff are governed
    by the amended tariff, unless the amended tariff has a
    15
    grandfathering provision,” 
    id. at 19-20
    (citing cases); Order on
    Remand at P. 15 (adopting our discussion of FERC precedent
    in other Commission interconnection-queue cases), the
    Commission determined it could not reasonably conclude that
    West Deptford was on notice that Section 219 would not apply
    to its interconnection agreement. The reliance on our opinion
    is proper, and FERC’s explanation suffices. See Hall v.
    McLaughlin, 
    864 F.2d 868
    , 872 (D.C. Cir. 1989) (“Where the
    reviewing court can ascertain that the agency has not in fact
    diverged from past decisions, the need for a comprehensive and
    explicit statement of its current rationale is less pressing.”).
    While Marcus Hook does not contest the Commission’s
    understanding of its own precedent, Marcus Hook maintains
    that the Commission erred by failing to consider extrinsic
    evidence and Marcus Hook’s additional arguments on remand.
    As to the first, Marcus Hook contends that the extrinsic
    evidence “incontestably shows that Section 219 was not to be
    applied to West Deptford,” and yet, FERC ignored such
    evidence improperly in reliance on our decision in West
    Deptford. Pet’r’s Br. 31-33. However, the Commission’s
    interpretation of our decision was correct. In West Deptford,
    we rejected reliance on the evidence Marcus Hook cites –
    PJM’s Transmittal Letter, PJM’s answer in Dominion, and the
    West Deptford Facilities Study Agreement. With respect to the
    letter and PJM’s answer, as previously discussed, FERC found,
    based on our prior decision, that neither provided any clarity
    regarding Section 219’s applicability. Similarly, we rejected
    the argument that the facilities studies agreements supported
    Marcus Hook’s position. W. 
    Deptford, 766 F.3d at 24
    (noting
    that because West Deptford repeatedly objected to any such
    imposition of cost responsibility, “one-way assertions” in a
    facilities study agreement cannot put a party on notice, and
    Commission precedent treats such studies as “non-binding
    estimate of costs”). There was no need for FERC to reconsider
    16
    the effect of the evidence because this Court had expressed
    skepticism about the evidence’s ability to resolve the present
    question.
    As to the latter, Marcus Hook contends that the
    Commission refused to consider additional arguments it raised
    on remand, and therefore, the decision is arbitrary and
    capricious. We disagree. The first objection Marcus Hook
    claims that FERC ignored was that West Deptford’s parent
    company, LS Power Associates, was a party to the Dominion
    proceeding – the 2008 proceeding in which the new tariff
    replaced the old tariff – and therefore notice provided in that
    proceeding could be imputed to West Deptford. This objection
    is waived, however, because Marcus Hook did not raise it on
    rehearing and has provided no reasonable ground for its failure
    to do so. 16 U.S.C. § 825l(b) (“No objection to the order of the
    Commission shall be considered by the court unless such
    objection shall have been urged before the Commission in the
    application for rehearing unless there is a reasonable ground
    for failure to do so.”). We find that the remaining objections
    Marcus Hook claims were ignored, including arguments
    Marcus Hook repeats with respect to the facilities study
    agreements, were directly and adequately addressed by the
    Commission.
    Accordingly, we conclude that the Commission
    reasonably determined that Section 219 should govern West
    Deptford’s interconnection agreement.
    B.
    We next address Marcus Hook’s argument that even if the
    costs associated with Network Upgrade 28 are governed by
    Section 219 of the tariff, the Commission erred in determining
    that the execution date of West Deptford’s interconnection
    17
    agreement was the relevant event for assigning cost
    responsibility under the tariff. Pet’r’s Br. 40-41. As previously
    discussed, we give substantial deference to the Commission’s
    interpretation of filed tariffs unless the language is
    unambiguous. Old 
    Dominion, 518 F.3d at 48
    .
    PJM Tariff § 219 provides as follows:
    Cost responsibility under this Section 219 may
    be assigned with respect to any facility or
    upgrade:
    (a) the completed cost of which was $5,000,000
    or more, for a period of time not to exceed
    five years from the execution date of the
    Interconnection Service Agreement for the
    project that initially necessitated the
    requirement for the Local Upgrade or
    Network Upgrade.
    Both parties agree that the tariff is silent with respect to the
    relevant event for determining cost responsibility under
    Section 219. Pet’r’s Br. 40; Resp’t’s Br. 31 (citing Rehearing
    Order at P. 22); see also Order on Remand at P. 22.
    Accordingly, we will defer to the Commission’s construction
    so long as that construction is reasonable. Williams Nat. Gas
    Co. v. FERC, 
    3 F.3d 1544
    , 1551 (D.C. Cir. 1993).
    Here, the Commission concluded that the proper date for
    determining cost responsibility is the date on which the
    interconnection agreement is executed. Order on Remand at P.
    22; Rehearing Order at P. 22. In its Order on Remand, the
    Commission supported this interpretation by pointing out that
    “the tariff identifies the assignment of cost responsibility . . . as
    the operative date, and that responsibility is not determined
    18
    until the interconnection agreement is executed.” Order on
    Remand at P. 22. Additionally, FERC explained that this
    reading was “consistent with the court’s determination that the
    interconnection agreement defines the tariff provisions
    applicable to the Marcus Hook interconnection.” 
    Id. On rehearing,
    the Commission expanded upon its reasoning,
    stating that its decision was “consistent with the purpose of
    Section 219, i.e., to assign cost responsibility, since cost
    responsibility is assigned upon execution of the
    interconnection agreement” and “consistent with the overall
    intent of PJM’s interconnection revisions to clarify the
    interconnection procedures and to shorten the window of cost
    responsibility.” Rehearing Order at P. 22.
    Marcus Hook contends that none of the Commission’s
    justifications withstand scrutiny, and that the dispositive date
    should be either the date West Deptford submitted its
    interconnection request (July 31, 2006) or when PJM
    determined that Network Upgrade 28 was required for West
    Deptford’s generation project to be interconnected (November
    2006). Pet’r’s Br. 41, 45. Although Marcus Hook’s suggested
    interpretation is a possible reading of the tariff provision, it is
    no more reasonable than the one the Commission put forward.
    Accordingly, we find that the Commission did not err in its
    interpretation of Section 219 of the revised tariff.
    For the foregoing reasons, we deny the Petition for
    Review.