New England Power Generators Ass'n v. Federal Energy Regulatory Commission ( 2018 )


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  •  United States Court of Appeals
    FOR THE DISTRICT OF COLUMBIA CIRCUIT
    Argued October 6, 2017            Decided February 2, 2018
    No. 15-1071
    NEW ENGLAND POWER GENERATORS ASSOCIATION, INC.,
    PETITIONER
    v.
    FEDERAL ENERGY REGULATORY COMMISSION,
    RESPONDENT
    PSEG ENERGY RESOURCES & TRADE LLC, ET AL.,
    INTERVENORS
    Consolidated with 16-1042
    On Petitions for Review of Orders of
    the Federal Energy Regulatory Commission
    Ashley C. Parrish argued the cause for petitioner. With
    him on the briefs were David G. Tewksbury, and Paul Alessio
    Mezzina. Stephanie S. Lim entered an appearance.
    Kenneth R. Carretta and Cara J. Lewis were on the brief
    for intervenors PSEG Companies in support of petitioner.
    2
    Ross R. Fulton, Attorney, Federal Energy Regulatory
    Commission, argued the cause for respondent. With him on
    the brief was Robert H. Solomon, Solicitor.
    Jason Marshall argued the cause for intervenors. With
    him on the brief were Joseph Arnold Rosenthal, Rachel A.
    Goldwasser, and Clare E. Kindall and Robert Louis Marconi,
    Assistant Attorneys General, Office of the Attorney for the
    State of Connecticut. Michael C. Wertheimer, Assistant
    Attorney General, and John S. Wright, Attorney, Office of the
    Attorney General for the State of Connecticut, entered
    appearances.
    Before: SRINIVASAN and WILKINS, Circuit Judges, and
    SENTELLE, Senior Circuit Judge.
    Opinion for the Court filed by Circuit Judge WILKINS.
    WILKINS, Circuit Judge: We consider two Petitions for
    Review challenging Federal Energy Regulatory Commission
    (“FERC” or “the Commission”) Orders denying complaints by
    two electricity suppliers. See Order on Compl., New Eng.
    Power Generators Ass’n, Inc. v. ISO New Eng. Inc., 
    146 FERC ¶ 61,039
     (2014) (“Initial NEPGA Order”); Order Denying
    Reh’g & Clarification, New Eng. Power Generators Ass’n, Inc.
    v. ISO New Eng. Inc., 
    150 FERC ¶ 61,064
     (2015) (“NEPGA
    Rehearing Order”); Order Denying Compl., Exelon Corp., et
    al. v. ISO New Eng. Inc., 
    150 FERC ¶ 61,067
     (2015) (“Initial
    Exelon Order”); Order Denying Reh’g, Exelon Corp., et al. v.
    ISO New Eng. Inc., 
    154 FERC ¶ 61,005
     (2016) (“Exelon
    Rehearing Order”).
    Petitioners challenge four FERC orders that uphold the
    current iteration of the Tariff that governs electricity rates in
    New England. To ensure future electricity capacity in New
    3
    England, electricity suppliers and distributors transact in a
    Forward Capacity Market (“FCM”), a yearly auction in which
    distributors pay suppliers for their production capacity three
    years in the future. The Tariff, a patchwork of rules and orders
    adopted by the Independent System Operator of New England
    (“ISO-NE”) and approved by FERC, governs how FCM
    participants buy and sell future capacity. Petitioners challenge
    two of the rules, which they contend altered the structure of the
    FCM to the detriment of Petitioners and other existing
    suppliers.
    Petitioners, the New England Power Generators
    Association, Inc. (“NEPGA”) and Exelon Corporation
    (“Exelon”), are electricity suppliers who participate in New
    England’s FCM Auction. Because they have participated in
    the FCM in the past and are not “new entrants,” they cannot
    reap the benefits of the two rules challenged in this case, which
    benefit only new suppliers. FERC denied complaints filed by
    each Petitioner under 16 U.S.C. § 825e, and FERC
    subsequently denied petitions for rehearing. Both Petitioners
    filed timely appeals. This Court has jurisdiction under 16
    U.S.C. § 825l(b). For the reasons explained below, the
    Petitions for Review are granted.
    I.
    The Federal Power Act (“FPA”) empowers FERC to
    regulate the sale and transmission of electricity to ensure that
    electricity is provided at a “just and reasonable” rate. 16 U.S.C.
    § 824d(a). All rates for or in connection with jurisdictional
    sales and transmission service are subject to review by FERC
    to ensure that the rates are just and reasonable and not unduly
    discriminatory or preferential. Id. §§ 824d(e), 824e(a). A
    public utility first proposes rates with FERC pursuant to section
    205 of the FPA, and the utility has the burden to show that its
    4
    rate is lawful. Id. §§ 824d(c), 824d(e). A negatively affected
    party can challenge the rate by filing a complaint with FERC,
    and the challenging party then carries the burden to show that
    the existing rate has become unjust or unreasonable. Id.
    § 824e(a), (b). If FERC agrees that the rate is unjust or
    unreasonable, it must establish a new rate.
    A.
    “Capacity is not electricity itself but the ability to produce
    it when necessary.” Conn. Dep’t of Pub. Util. Control v.
    FERC, 
    569 F.3d 477
    , 479 (D.C. Cir. 2009) (internal quotation
    marks omitted). Pursuant to the FPA, FERC regulates capacity
    markets, “which dictate the amount of electricity available for
    production and transmission when needed.” New Eng. Power
    Generators Ass’n v. FERC (NEPGA I), 
    757 F.3d 283
    , 285
    (D.C. Cir. 2014) (citing Conn. Dep’t of Pub. Util. Control, 
    569 F.3d at 479
    ). Order Number 888 is the bedrock of FERC’s
    electricity regulatory regime. In that order, “FERC undertook
    to promote wholesale competition through open access and
    nondiscriminatory transmission services.” Id. at 285-86. To
    accomplish that goal, FERC “encouraged the formation of
    independent systems operators (ISOs) to administer
    transmission services and new markets for wholesale
    electricity transactions.” Sithe/Indep. Power Partners, L.P. v.
    FERC, 
    285 F.3d 1
    , 2 (D.C. Cir. 2002). ISOs manage the
    electricity grid on behalf of transmission-owning member
    utilities, “providing generators with access to transmission
    lines and ensuring that the network conducts electricity
    reliably.” FERC v. Elec. Power Supply Ass’n, 
    136 S. Ct. 760
    ,
    768 (2016).
    ISOs provide open access to the transmission lines at rates
    established by a single tariff. In setting the tariff, ISOs “adopt
    transmission (and ancillary services) pricing policies to
    5
    promote the efficient use of, and investment in, generation,
    transmission, and consumption of wholesale electric power in
    specific energy capacity systems.” NEPGA I, 757 F.3d at 286
    (internal quotation marks omitted). Tasked with ensuring the
    reliability of electric power for their geographic region, ISOs
    “must implement a scheme that will incent resources to provide
    sufficient energy capacity.” Id.
    To ensure that there is sufficient electricity to meet
    demand in the near-term future, ISO-NE administers a Forward
    Capacity Auction (“FCA”). An FCA is a market where energy
    suppliers sell their energy capacity to energy distributors three
    years in advance of a year-long commitment period. Each year,
    ISO-NE determines the amount of capacity that will be
    required for system reliability in three years and requires that
    amount (the installed capacity requirement or “ICR”) to be
    purchased at auction. The auctions are “descending clock”
    auctions, where the starting price is high and suppliers indicate
    how much capacity they will provide at that price, then the
    price decreases in each successive round of the auction
    resulting in the aggregate quantity of capacity offered by
    suppliers decreasing as the auction proceeds. The auction is
    over when the aggregate amount of capacity offered equals the
    ICR. Suppliers who remain in the auction at that point have
    “cleared” their bids. They will assume capacity-supply
    obligations for a one-year period three years in the future and
    are typically paid the auction-clearing price.
    ISO-NE adopted a price “lock-in” rule and a “capacity-
    carry-forward” rule, both designed to encourage new
    generating resources – i.e., suppliers – to enter the market. The
    rules allow new suppliers to “lock in” their first-year clearing
    prices for up to an additional six years, and require that the
    capacity of the price-locked resources be offered into the future
    FCAs for those additional six years, potentially even at a price
    6
    of zero. This reduces clearing prices paid to all suppliers, new
    and existing, by mandating new entrants to submit low bids in
    the later auctions. The new entrants submit those low bids with
    the knowledge they will still get paid the lock-in price for their
    capacity. However, a minimum-offer rule for new suppliers in
    the entry auction – by which ISO-NE sets a price a new entrant
    cannot bid below – mitigates any price suppression in the entry
    auction. See NEPGA I, 757 F.3d at 291.
    B.
    NEPGA and Exelon each filed complaints with FERC
    against ISO-NE under section 206 of the FPA, challenging
    ISO-NE’s Tariff provisions that establish the lock-in and
    capacity-carry-forward rules. Petitioners challenged the Tariff
    on the grounds that the provisions result in new suppliers
    reaping a windfall and existing suppliers getting short shrift in
    both the entry and post-entry auctions. Petitioners argued that
    the rates were unduly discriminatory and, thus, unjust and
    unreasonable because of the interplay of two provisions: (1)
    the provision allowing new suppliers to lock in a price at their
    entry auctions that they are guaranteed for a total of seven
    years; and (2) the provision requiring the new suppliers with a
    locked-in price to offer their capacity in the post-entry auctions
    as a price-taker – i.e., requiring the locked-in suppliers to bid
    their capacity all the way to zero.
    FERC denied both complaints with respect to the issues
    challenged in this appeal. 1 Initial NEPGA Order ¶ 1; Initial
    Exelon Order ¶ 1. The Commission also denied both
    1
    FERC granted NEPGA’s complaint in part, finding that one aspect
    of the Tariff resulted in unjust and unreasonable prices paid to
    existing suppliers, but FERC remedied that by adopting a separate
    proposal by ISO-NE altering the problematic Tariff provision.
    7
    Petitioners’ requests for rehearing. NEPGA Rehearing Order
    ¶ 1; Exelon Rehearing Order ¶ 1. Petitioners argued that the
    combination of the lock-in rule and the capacity-carry-forward
    rule rendered the ISO-NE Tariff unjust and unreasonable
    because of improper price discrimination against existing
    suppliers. Petitioners relied heavily on a 2009 FERC decision
    that rejected a proposal to institute lock-in and capacity-carry-
    forward rules in the Mid-Atlantic market run by PJM, another
    ISO. Order on Clarification and Reh’g and on Compliance
    Filings, PJM Interconnection, L.L.C., 
    128 FERC ¶ 61,157
    (2009). In PJM, FERC rejected similar lock-in and capacity-
    carry-forward rules proposed for a different market because the
    proposals would result in price suppression and discriminatory
    rates.
    Petitioners pointed out two differences in the ISO-NE and
    PJM markets that they alleged would make the price-
    suppression effects of ISO-NE’s rules worse than the scheme
    FERC rejected in PJM: (1) the PJM lock-in period was only for
    three years, rather than seven; and (2) the PJM lock-in option
    was rarely triggered, whereas the lock-in option in New
    England was available to any new market entrant. Petitioners
    argued that, consistent with PJM, FERC should have either
    rejected the lock-in and capacity-carry-forward rules, required
    ISO-NE to eliminate the zero-price offer requirement when it
    accepted a sloped demand curve, or ameliorated the price
    suppression for existing suppliers in some other way. Exelon
    even provided an expert witness, cited in its complaint, who
    “explained that under the proposed [lock-in] rule, a new entrant
    will offer at an artificially low level knowing that it will receive
    up to six additional installment payments in the succeeding
    FCAs . . . .” Exelon Rehearing Order ¶ 11. The rules resulted
    in price suppression in the entry auction, according to
    Petitioners, because the new entrants would lower the capacity
    8
    offer-prices, whereas “other suppliers do not receive any
    payment to make up for the lower price . . . .” 
    Id.
    FERC’s responses to Petitioners’ arguments morphed over
    the course of the nearly two years between the Commission’s
    denial of NEPGA’s complaint and its denial of Exelon’s
    rehearing request.
    In the denial of NEPGA’s complaint, FERC stated that the
    purpose of the rules is “to mitigate the price suppressing effects
    of over-procurement in subsequent years, following the
    procurement of capacity from a new resource that exceeds the
    amount of new capacity required in a zone.” Initial NEPGA
    Order ¶ 56. FERC went on to explain that it is not possible to
    know whether the price-lock and capacity-carry-forward rules
    would suppress prices below competitive levels because “there
    is not necessarily a link between the capacity carried
    forward . . . and the amount of excess capacity remaining . . .
    during the [next six years].” 
    Id. ¶ 57
    . Essentially, FERC said
    that simply because capacity gets carried forward into future
    FCAs, it doesn’t necessarily follow that the subsequent FCAs
    will also have excess capacity, and therefore prices might not
    be suppressed below competitive levels. It also reiterated the
    purpose of the rules: to ensure ISO-NE would meet capacity-
    supply needs in the future so that the people of New England
    would not have power shortages.
    FERC responded to the argument that the challenged
    provisions were substantially similar to the provisions
    proposed and roundly rejected in PJM, and that FERC could
    not square its rationale from that case with its approval of the
    lock-in and capacity-carry-forward rules. The Commission
    disagreed that the pricing provisions pertaining to carried-
    forward capacity at issue in PJM were substantially similar to
    the capacity-carry-forward rule, including that, “[m]ost
    9
    importantly, unlike ISO-NE, PJM use[d] a sloped demand
    curve in its forward capacity market, which eliminate[d] the
    need for PJM to uneconomically pro-ration capacity.” Initial
    NEPGA Order ¶ 58.
    FERC denied NEPGA’s request for rehearing and
    Exelon’s initial complaint on the same day. In the denial of
    rehearing, FERC tried to clarify aspects of its previous ruling.
    FERC found that NEPGA’s proposal would raise prices and
    inadequately protect consumers. FERC also rejected the
    argument that the PJM decision required it to alter the ISO-NE
    Tariff. Because FCM-design is premised on the idea that
    resources submit offer bids based on going-forward costs, and
    new entrants typically have lower going-forward costs, FERC
    stated that “it is efficient for those [new] resources to be
    selected over older existing resources . . .” NEPGA Rehearing
    Order ¶ 18. Therefore, FERC:
    [found] it [] appropriate for generators relying
    on [the price-lock rule] to submit zero-price
    offers during the lock-in period because zero-
    price offers are likely to approximate the low
    going-forward costs of new resources that have
    incurred most or all of their construction costs
    by the end of their first commitment year and
    are . . . less expensive to run than older, less
    efficient [ones].
    
    Id.
     The Commission noted that simply because different prices
    were paid to new and existing resources under the scheme does
    not make the Tariff unduly discriminatory. 
    Id. ¶ 19
    . And ISO-
    NE had adopted the rules based on valid goals: “The Capacity
    Carry Forward Rule ameliorates the reduction in prices paid to
    existing resources when the entry of new resources results in
    excess capacity[,]” and “[t]he New Entrant Pricing lock-in
    10
    mitigates price risk.” 
    Id.
     FERC denied that its rejection of a
    similar proposal in PJM was dispositive because “market
    design and rules need not be identical among the regions to be
    just and reasonable.” 
    Id.
     FERC also noted that its
    accompanying order denying Exelon’s complaint would
    further explain the salient market differences between the ISO-
    NE and PJM markets.
    In denying Exelon’s complaint, FERC explained that the
    combination of the price lock-in and the capacity-carry-
    forward requirement was efficient:
    When each resource offers to supply capacity at
    its going-forward costs, the auction can select
    the set of resources with the lowest costs and
    reject the set of resources with the highest costs,
    so that capacity is procured at the lowest total
    cost. A resource whose construction has
    recently been completed . . . typically has very
    low going-forward costs. It is efficient for such
    a resource to be a price-taker (effectively
    submitting a $0 price offer) . . . .
    Initial Exelon Order ¶ 30. Although FERC agreed that the
    price-lock and capacity-carry-forward rules would cause lower
    prices in some circumstances, it stated that Exelon had not met
    its burden of proving that the rules were unjust and
    unreasonable. 
    Id. ¶ 29
    . Although the mechanisms used by
    PJM and ISO-NE similarly resulted in price differentials for
    new and existing suppliers, FERC was “not persuaded that this
    difference, in itself, renders ISO-NE’s rules unjust and
    unreasonable.” 
    Id. ¶ 35
    .
    FERC’s rationale was made plain in its denial of Exelon’s
    request for rehearing: that the main factor it earlier asserted
    11
    would mitigate price suppression – a vertical demand curve –
    no longer supported its finding that ISO-NE’s Tariff was just
    and reasonable because FERC had approved ISO-NE’s
    adoption of a sloped demand curve. FERC reiterated that new
    suppliers – capacity-carry-forward rule or not – would typically
    offer capacity in post-entry auctions at a price near zero
    because that reflected the supplier’s going-forward costs.
    Thus, “[b]y allowing sellers to reflect their going-forward costs
    in their offers, ISO-NE is able to select the most efficient
    (lowest cost) set of resources, because the low offer prices
    reflect low going-forward costs.” Exelon Rehearing Order
    ¶ 15. In the alternative, FERC also stated that a lower clearing
    price “is an acceptable byproduct of a just and reasonable
    market rule . . . that achieves particular and distinct objectives”:
    (1) incenting new entry into the FCAs to ensure capacity; and
    (2) protecting consumers from high prices. 
    Id. ¶ 16
    .
    The Commission stated that ISO-NE and PJM had
    “differing clearing mechanics” which made the PJM
    comparison imperfect. 
    Id. ¶ 17
    . Even so, FERC acknowledged
    and brushed aside the seeming contradiction:
    As the markets have evolved, so too has the
    Commission’s opinion regarding whether zero-
    price offers from locked-in resources may be
    just and reasonable.          Based on further
    consideration, the Commission has realized that
    a zero-price capacity offer from a new []
    resource that has cleared in at least one previous
    auction and has incurred construction costs can
    be a competitive offer that reflects the
    resource’s going-forward costs, not an attempt
    to lower . . . prices. Once a new resource clears
    its initial capacity auction . . . , it has an
    incentive to ensure that it clears in subsequent
    12
    auctions.    A zero-price offer strategy is
    consistent with that incentive.
    
    Id. ¶ 18
    .
    II.
    Section 205(b) of the FPA provides that “[n]o public utility
    shall . . . maintain any unreasonable difference in rates . . . .”
    16 U.S.C. § 824d(b)(2). Section 206(a) of the FPA prohibits
    undue discrimination. 16 U.S.C. § 824e(a), (b). But “[t]he
    court will not find a Commission determination to be unduly
    discriminatory if the entity claiming discrimination is not
    similarly situated to others.” Transmission Agency of N. Cal.
    v. FERC, 
    628 F.3d 538
    , 549 (D.C. Cir. 2010). Petitioners bear
    the burden of showing that the rates are unjust and
    unreasonable. 16 U.S.C.§ 824e(a); see also FirstEnergy Serv.
    Co. v. FERC, 
    758 F.3d 346
    , 353-54 (D.C. Cir. 2014).
    To fulfill its mandate to set “just and reasonable” rates,
    FERC is not “‘bound to the use of any single formula or
    combination of formulae . . . .’” Grand Council of Crees (of
    Quebec) v. FERC, 
    198 F.3d 950
    , 956 (D.C. Cir. 2000) (quoting
    Fed. Power Comm’n v. Hope Nat. Gas Co., 
    320 U.S. 591
    , 602
    (1944)). Due to practical challenges and myriad divergent
    interests, FERC “must be given the latitude to balance the
    competing considerations and decide on the best resolution” in
    its regulation of electricity markets. Blumenthal v. FERC, 
    552 F.3d 875
    , 885 (D.C. Cir. 2009). “Congress has entrusted the
    regulation of the electricity industry to FERC, not to the
    courts.” 
    Id. at 884
    . Therefore, “‘[a] presumption of validity
    . . . attaches to each exercise of the Commission’s expertise.’”
    
    Id. at 884-85
     (quoting In re Permian Basin Area Rate Cases,
    
    390 U.S. 747
    , 767 (1968)).
    13
    Petitioners contend that they are similarly situated to new
    suppliers and that the Tariff sets prices that are unduly
    discriminatory. But if FERC can “reveal[] [a] basis for its
    contention” that new market entrants were not similarly
    situated to existing suppliers, the Tariff might well be just and
    reasonable. See Dynegy Midwest Generation, Inc. v. FERC,
    
    633 F.3d 1122
    , 1127 (D.C. Cir. 2011). FERC contends that the
    Tariff provisions at issue incentivize new entry into the market,
    provide reliability for future electricity, and lower prices for
    consumers. The Commission emphasizes that the minimum-
    price offer rule mitigates the effects of the lock-in and capacity-
    carry-forward rules by preventing new suppliers from
    suppressing prices below a reasonable level. See, e.g., NEPGA
    I, 757 F.3d at 291. Petitioners want FERC either to eliminate
    the Tariff provisions that result in price discrimination between
    new and existing suppliers or to implement measures to further
    mitigate the effects of the incentive provisions.
    Because we find that FERC failed to offer adequate
    rationale and explanation in the challenged Orders, we decline
    to pass on whether Petitioners have met their burden to
    demonstrate that the rates were unjust and unreasonable. For
    reasons discussed below, FERC must provide a more robust
    rationale for its seeming inconsistency with past precedent and
    practice.
    III.
    A.
    While afforded wide latitude in ratesetting due to its
    expertise and broad statutory mandate, FERC – like all
    agencies – must engage in reasoned decisionmaking. The
    arbitrary-and-capricious standard requires the agency to
    “examine the relevant data and articulate a satisfactory
    14
    explanation for its action including a rational connection
    between the facts found and the choice made.” Motor Vehicle
    Mfrs. Ass’n v. State Farm Mut. Auto. Ins. Co., 
    463 U.S. 29
    , 43
    (1983) (citation and internal quotation marks omitted). “It is
    well established that the Commission must ‘respond
    meaningfully to the arguments raised before it.’”
    TransCanada Power Mktg. Ltd. v. FERC, 
    811 F.3d 1
    , 12 (D.C.
    Cir. 2015) (quoting Pub. Serv. Comm’n v. FERC, 
    397 F.3d 1004
    , 1008 (D.C. Cir. 2005)).
    “It is textbook administrative law that an agency must
    provide[] a reasoned explanation for departing from precedent
    or treating similar situations differently.” W. Deptford Energy,
    LLC v. FERC, 
    766 F.3d 10
    , 20 (D.C. Cir. 2014) (internal
    citation and quotation marks omitted) (alteration in original).
    Although an agency “need not demonstrate to a court’s
    satisfaction that the reasons for [a] new policy are better than
    the reasons for the old one,” the agency must “ordinarily . . .
    display awareness that it is changing position.” FCC v. Fox
    Television Stations, Inc., 
    556 U.S. 502
    , 515 (2009) (emphasis
    in original). “An agency may not, for example, depart from a
    prior policy sub silentio or simply disregard rules that are still
    on the books.” 
    Id.
     Although case-by-case adjudication
    sometimes results in decisions that seem at odds but can be
    distinguished on their facts, it is the agency’s responsibility to
    provide a reasoned explanation of why those facts matter. See,
    e.g., BP Energy Co. v. FERC, 
    828 F.3d 959
    , 968 (D.C. Cir.
    2016) (vacating finding of no undue discrimination where
    Commission identified differences between two natural-gas
    companies but failed to adequately explain why they provide a
    rational basis for the difference in treatment).
    15
    B.
    On the record before us, we conclude that FERC did not
    engage in the reasoned decisionmaking required by the
    Administrative Procedure Act. FERC failed to respond to the
    substantial arguments put forward by Petitioners and failed to
    square its decision with its past precedent. In the main,
    Petitioners argue that the same factors that led FERC to reject
    similar Tariff mechanisms in PJM were substantially
    exacerbated by the Tariff provisions FERC approved here.
    FERC did not sufficiently explain its apparent change of
    position.
    Specifically, FERC failed to adequately explain why its
    rationale in PJM – which seems to foreclose signing off on a
    Tariff scheme like ISO-NE’s – does not apply even more
    forcefully to the scheme it accepted in the Orders below. In
    PJM, the Commission explained that PJM’s bid-floor
    requirement was needed to ensure that a price-locked new
    entrant “will not reduce [the] price to the existing resources by
    submitting a $0 bid in Years 2 and 3, knowing that it is
    guaranteed to be paid its first year bid price no matter what it
    bids.” PJM, 
    128 FERC ¶ 61,157
    , P. 112. It also found that
    zero-price bidding would result in unjust and discriminatory
    pricing. 
    Id.
     The holding and entire rationale of PJM strongly
    suggests that a lock-in mechanism, combined with a capacity-
    carry-forward rule with a zero-price offer requirement,
    depresses prices in a way that “adversely affects” existing
    market participants.
    As Petitioners argued, the structural mechanisms of the
    ISO-NE market appear to exacerbate all of the problems FERC
    cited for rejecting the similar rule in PJM. Petitioners point out
    multiple ways in which the ISO-NE Tariff seems to exacerbate
    the type of alleged discrimination FERC had rejected in PJM,
    16
    including the fact that the lock-in period is seven years and the
    new market entrants are all required to bid their capacity at a
    price of zero (if necessary) for the duration of that time.
    FERC’s responses to Petitioners’ arguments below
    amounted to conclusory statements that dismissed Petitioners’
    concerns without providing reasoned analysis. To respond to
    Petitioners’ main contention that the ISO-NE Tariff rules
    suppressed prices and discriminated against existing suppliers
    in a way that the Commission rejected in PJM, FERC first
    stated that conditions in the two markets were different, and
    then pointed to the vertical demand curve in place at the time
    under the ISO-NE Tariff. The Commission issued this
    explanation despite the fact that it issued an order the very same
    day adopting an ISO-NE proposal to start using a sloped
    demand curve. FERC pointed out that pricing mechanisms
    need not be the same in different markets. But rather than
    explain how those mechanisms made the PJM proposal unjust
    but a nearly identical one just and reasonable for ISO-NE,
    FERC pointed to its accompanying order for further
    explanation. That explanation consisted of: (1) shifting the
    burden back to Exelon to show that the ISO-NE rules were
    unjust and unreasonable; and (2) stating that ISO-NE’s price-
    lock mechanism does a better job of selecting energy suppliers
    with low going-forward costs. Initial Exelon Order ¶¶ 31, 34.
    With respect to the possibility of different prices paid to
    existing resources, FERC simply stated it was not “persuaded
    that this difference, in itself, renders ISO-NE’s rules unjust and
    unreasonable” and noted that different markets need not have
    uniform rules for them all to be fair. 
    Id. ¶ 35
    .
    It was not until the denial of Exelon’s motion for rehearing
    that FERC even attempted to grapple with Petitioners’
    arguments based on PJM. It did so, once again, with
    conclusory statements that price suppression is an “acceptable
    17
    byproduct of a just and reasonable market rule . . . that achieves
    particular and distinct objectives in the region” and that “[a]s
    the markets have evolved, so too has the Commission’s opinion
    regarding whether zero-price offers from locked-in resources
    may be just and reasonable.” Exelon Rehearing Order ¶¶ 16,
    18. This belated attempt to distinguish PJM after failing to do
    so in the previous three Orders is inconsistent with reasoned
    decisionmaking.
    A recent case decided by this Court illustrates the point.
    In West Deptford Energy, this Court vacated and remanded a
    FERC Order that applied a particular Tariff scheme to a
    generator, the effect of which was to treat the generator
    differently than other similarly situated generators. 766 F.3d
    at 20. The panel discussed the requirement that FERC provide
    an adequate rationale for its decision, especially in light of a
    then-recent FERC decision expressing a preference for a
    uniform scheme at odds with its challenged order, which
    indicated it would make further Tariff adjustments on a case-
    by-case basis. Id. at 20-21. Although the Court reasoned that
    FERC could likely use the ratesetting scheme at issue, FERC
    had not explained the seeming inconsistency with past practice.
    Id. Despite FERC’s (sometimes persuasive) arguments on
    appeal, the same is true here.
    FERC cites numerous cases to stress the broad array of
    practical difficulties to balance and interests to consider,
    including higher consumer prices, reliable price signals,
    producer flexibility, producer confidence, system reliability,
    and increasing system capacity and efficiency. FERC explains
    that the balance it struck here is reasonable because: (1) New
    England faces a lack of investment in new capacity; and (2) the
    amended new entrant rule is linked with the sloped demand
    curve to help ensure that the “demand curve construct overall”
    will achieve system reliability. Intervenors make an even more
    18
    compelling argument that FERC’s Orders are just and
    reasonable, and that Petitioners’ proposals would exacerbate
    other problems in the market. Intervenors also distinguish the
    PJM and ISO-NE markets, providing more context than FERC
    did below. FERC contends that it truly has changed its view
    about the lock-in and capacity-carry-forward rules since its
    PJM decision and even doubled down by suggesting at oral
    argument that it would be more receptive to the Tariff changes
    at issue in PJM if they were proposed today. See Oral Arg.
    Recording at 25:35-26:26.
    All this may be true. But FERC’s complex mandate
    doesn’t relieve it of the requirements of reasoned
    decisionmaking. See PSEG Energy Res. & Trade LLC v.
    FERC, 
    665 F.3d 203
    , 210 (D.C. Cir. 2011) (granting petition
    for review and remanding for further explanation because “the
    Rehearing Order[] . . . states that the purpose of the . . . Rule’s
    price floor is to ensure relative market stability during the
    initial years of the Forward Capacity Market. . . . But once
    again, the order does nothing more than make the quoted
    statement; it does not suggest that – let alone explain how – it
    was a response to PSEG’s undue discrimination or policy
    arguments.” (internal quotation marks omitted)). Similarly,
    FERC must reasonably explain how the existing suppliers and
    new entrants are not similarly situated and in what respects the
    reasons are material. See Edison Mission Energy, Inc. v.
    FERC, 
    394 F.3d 964
    , 968-69 (D.C. Cir. 2005) (vacating FERC
    ruling that allowed unreasonable price suppression for lack of
    adequate explanation).
    Although FERC may be sincere in its change of heart and,
    as a substantive matter, correct that its new rationale is just and
    reasonable, the Commission must provide some analysis and
    explanation in its Orders regarding why it changed course. As
    this Court has noted, “we need not – and indeed cannot –
    19
    consider ‘appellate counsel’s post hoc rationalizations’ for
    Commission action.” W. Deptford Energy, 766 F.3d at 25
    (quoting Me. Pub. Utils. Comm’n v. FERC, 
    625 F.3d 754
    , 759
    (D.C. Cir. 2010)). “FERC’s failure to come to terms with its
    own precedent reflects the absence of a reasoned
    decisionmaking process.” PG&E Gas Transmission, Nw.
    Corp. v. FERC, 
    315 F.3d 383
    , 390 (D.C. Cir. 2003).
    IV.
    For the reasons discussed above, we grant the Petitions
    before us and remand to FERC for further proceedings
    consistent with this opinion.