Cpuc v. Ferc ( 2018 )


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  •                 FOR PUBLICATION
    UNITED STATES COURT OF APPEALS
    FOR THE NINTH CIRCUIT
    CALIFORNIA PUBLIC UTILITIES              No. 16-70481
    COMMISSION,
    Petitioner,
    OPINION
    CALIFORNIA DEPARTMENT OF
    WATER RESOURCES STATE WATER
    PROJECT; SACRAMENTO MUNICIPAL
    UTILITY DISTRICT; TRANSMISSION
    AGENCY OF NORTHERN CALIFORNIA,
    Petitioners-Intervenors,
    v.
    FEDERAL ENERGY REGULATORY
    COMMISSION,
    Respondent,
    PACIFIC GAS & ELECTRIC COMPANY,
    Respondent-Intervenor.
    On Petition for Review of an Order of the
    Federal Energy Regulatory Commission
    Argued and Submitted October 13, 2017
    San Francisco, California
    Filed January 8, 2018
    2                          CPUC V. FERC
    Before: Sidney R. Thomas, Chief Judge, and Stephen
    Reinhardt and Stephen S. Trott, Circuit Judges.
    Opinion by Chief Judge Thomas
    SUMMARY*
    Federal Energy Regulatory Commission
    The panel granted the California Public Utilities
    Commission’s (“CPUC”) petition for review and held that the
    Federal Energy Regulatory Commission (“FERC”) arbitrarily
    and capriciously determined that Pacific Gas & Electric was
    eligible for an incentive adder for remaining a member of the
    California Independent System Operator Corporation when
    state law prevented PG&E’s departure without authorization.
    Section 219(c) of the Federal Power Act required FERC
    to provide incentives to induce utilities to join regional
    transmission organizations. Accordingly, FERC adopted
    Order 679 which established upward adjustments, or
    “incentive adders,” to the rate of return on equity of utilities
    that participate in transmission organizations. In 1998, the
    CPUC approved PG&E’s transfer of operational control of
    certain transmission assets to a newly-created California
    Independent System Operator Corporation.
    The panel held that FERC did not reasonably interpret
    Order 679 as justifying summary grants of adders for
    *
    This summary constitutes no part of the opinion of the court. It has
    been prepared by court staff for the convenience of the reader.
    CPUC V. FERC                         3
    remaining in a transmission organization. The panel also held
    that FERC’s interpretation was neither entitled to Auer v.
    Robbins, 
    519 U.S. 452
    (1997), deference nor persuasive in
    its own right. The panel further held that because its
    interpretation was unreasonable, FERC’s grants of adders to
    PG&E were an unexplained departure from longstanding
    policy, which provided that incentives should only be
    awarded to induce future voluntary behavior. In addition, the
    panel held that FERC created a generic adder in violation of
    Order 679’s requirement of case-by-case review of adders.
    The panel held that the CPUC’s petition was not an
    impermissible collateral attack on Order 679.
    COUNSEL
    Traci L. Bone (argued), Harvey Y. Morris, and Arocles
    Aguilar, San Francisco, California, as and for Petitioner.
    Harvey L. Reiter (argued), Stinson Leonard Street LLP,
    Washington, D.C.; Michael R. Postar, Duncan Weinberg
    Genzer & Pembroke, Washington, D.C.; Katharine M.
    Mapes, Spiegel & McDiarmid LLP, Washington, D.C.; for
    Petitioners-Intervenors.
    Mark Patrizio (argued), San Francisco, California, for
    Respondent-Intervenor.
    Anand Viswanathan (argued), Attorney; Robert H. Solomon,
    Solicitor; Max Minzner, General Counsel; Washington, D.C.;
    as and for Respondent.
    4                      CPUC V. FERC
    OPINION
    THOMAS, Chief Circuit Judge:
    In this petition for review, we consider whether the
    Federal Energy Regulatory Commission (“FERC” or
    “Commission”) arbitrarily and capriciously determined that
    Pacific Gas & Electric Company (“PG&E”) was eligible for
    an incentive adder for remaining a member of the California
    Independent System Operator Corporation (“Cal-ISO”) when
    state law prevented PG&E’s departure without authorization.
    We conclude that it did, and we grant the petition.
    I
    Section 201 of the Federal Power Act (“FPA”) gives
    FERC jurisdiction over the rates, terms, and conditions of
    service for the transmission and sale at wholesale of electric
    energy in interstate commerce. 16 U.S.C. §§ 824(a)-(b).
    Section 219 of the FPA, added in 2005, directed FERC to
    promulgate a rule providing incentive-based rates for electric
    transmission for the purpose of benefitting consumers
    through increased reliability and lower costs of power.
    16 U.S.C. § 824s(a). As relevant here, section 219(c)
    required FERC to provide incentives to induce utilities to join
    regional transmission organizations. 16 U.S.C. § 824s(c).
    FERC did so in 2006 through the adoption of Order 679 and
    the rehearing orders that followed. Promoting Transmission
    Investment Through Pricing Reform, Order No. 679, 116
    FERC ¶ 61,057 (“Order 679”), order on reh’g, Order No.
    679-A, 117 FERC ¶ 61,345 (2006) (“Order 679-A”), order on
    reh’g, Order No. 679-B, 119 FERC ¶ 61,062 (2007) (“Order
    679-B”).
    CPUC V. FERC                                 5
    Order 679 established upward adjustments, or “incentive
    adders,” to the rate of return on equity of utilities that
    participate in transmission organizations. Order 679 set forth
    the terms on which FERC would grant the incentive adders.
    FERC determined that it would “not grant outright any
    incentives,” but that it would grant such incentives “when
    justified” in the context of individual declaratory orders or
    section 205 filings.1 Order 679 at PP 1, 326. FERC would
    evaluate adder requests on a “case-by-case basis.” 
    Id. at P
    326.
    Order 679 provided that adders would be available for
    utilities that “have already joined, and that remain members
    of,” transmission organizations in “recognition of the benefits
    that flow from membership” and the fact that “continuing
    membership is generally voluntary.” Order 679 at P 331.
    The order stated that a utility “will be presumed to be eligible
    for the incentive” if it can demonstrate that it has joined a
    transmission organization and that its membership is ongoing.
    
    Id. at P
    327.
    FERC declined to create a “generic adder” for
    membership in a transmission organization. Order 679 at P
    326. Commenters had urged FERC to make a “generic
    finding” that any entity that joins a transmission organization
    “automatically qualif[ies]” for an incentive adder, with at
    least one commenter specifically proposing a 50 basis-point
    incentive adder. 
    Id. at P
    318. FERC declined to adopt this
    1
    “Section 205” refers to FPA § 205, codified at 16 U.S.C. § 824d.
    Investor-owned utilities like PG&E make transmission owner rate case
    filings with FERC pursuant to section 205 in order to recover their costs
    of transmission service.
    6                         CPUC V. FERC
    proposal, electing to consider “on a case-by-case basis” what
    incentive (if any) is appropriate for a utility. 
    Id. at P
    326.
    In 1995, as part of its restructuring of California’s electric
    power industry, the California Public Utilities Commission
    (“CPUC”) ordered the state’s three largest investor-owned
    utilities, including PG&E, to submit to FERC a proposal to
    establish an independent system operator (“ISO”) and to
    transfer operational control of their facilities to that ISO.2
    Order Instituting Rulemaking on Commission’s Proposed
    Policies Governing Restructuring California’s Electric
    Service Industry and Reforming Regulation, 64 CPUC 2d 1,
    p. 95, 
    1995 WL 792086
    at *99 (Dec. 20, 1995) (“CPUC
    Decision 95-12-063”). In the same decision, CPUC retained
    authority under California state law to review any transfer of
    control of transmission facilities to the ISO. CPUC Decision
    95-12-063, p. 31, 
    1995 WL 792086
    at *15 (citing Cal. Pub.
    Util. Code § 851). CPUC’s determinations were largely
    affirmed in state law. See Cal. Pub. Util. Code §§ 330, 365.
    In 1997, California’s three largest investor-owned
    utilities, including PG&E, sought CPUC authorization to turn
    over operational control of certain transmission assets to the
    newly-created Cal-ISO. CPUC approved this transfer of
    control. In its decision approving the transfer, CPUC stated
    that any further transfers of control, such as transfers of
    control from the Cal-ISO back to the utilities, would also
    require CPUC authorization under state law.              Joint
    Application of Pac. Gas & Elec. Co., San Diego Gas & Elec.
    Co., and S. Cal. Edison Co., 78 CPUC 2d 307, p. 313, 1998
    2
    An ISO is a form of regional transmission organization, and an
    ISO’s members are eligible for incentive adders under section 219(c) and
    Order 679.
    CPUC V. FERC                               
    7 WL 242747
    at *7 (Jan. 21, 1998) (citing Cal. Pub. Util. Code
    § 851).
    Since it joined the Cal-ISO in 1997, PG&E has submitted
    an annual “transmission owner” tariff filing to FERC
    pursuant to section 205 of the FPA. See Pac. Gas. & Elec.
    Co., 148 FERC ¶ 61,245 at P 1 n.2 (2014). Each filing
    establishes PG&E’s transmission revenue requirement, which
    includes the rate of return to which it is entitled as a
    participating transmission owner. 
    Id. Since 2007,
    PG&E has
    regularly invoked Order 679 in its tariff filings to request
    50 basis-point incentive adders for its ongoing participation
    in the Cal-ISO, and FERC has summarily granted those
    requests.3 Various parties, including CPUC, protested
    PG&E’s earlier requests, but those cases settled without final
    resolution of the objections raised.
    In 2014 and 2015, PG&E filed its sixteenth and
    seventeenth transmission owner tariff filings, respectively
    (“TO 16” and “TO 17”). In each of those filings, PG&E
    requested a 50 basis-point incentive adder. CPUC filed
    timely protests to both of the filings. CPUC’s protests
    claimed that because PG&E’s continued participation in the
    Cal-ISO is mandated by CPUC order, granting it incentive
    adders would reward PG&E for doing something it was
    already required to do.
    3
    See Pac. Gas & Elec. Co., 120 FERC ¶ 61,296 at P 15 (2007); Pac.
    Gas & Elec. Co., 124 FERC ¶ 61,305 at P 20 (2008); Pac. Gas & Elec.
    Co. 128 FERC ¶ 61,288 at P 19 (2009); Pac. Gas & Elec. Co., 132 FERC
    ¶ 61,272 at P 23 (2010); Pac. Gas & Elec. Co., 141 FERC ¶ 61,168 at P
    25 (2012); Pac. Gas & Elec. Co., 144 FERC ¶ 61,227 at P 20 (2013); Pac.
    Gas & Elec. Co., 148 FERC ¶ 61,245 at P 30 (2014); Pac. Gas & Elec.
    Co., 152 FERC ¶ 61,252 at P 23 (2015).
    8                     CPUC V. FERC
    FERC issued orders in both proceedings summarily
    granting PG&E’s requested adders. Pac. Gas & Elec. Co.,
    148 FERC ¶ 61,245 at P 30 (2014) (“TO 16 Initial Order”);
    Pac. Gas & Elec. Co., 152 FERC ¶ 61,252 at P 23 (2015)
    (“TO 17 Initial Order”). The TO 16 Initial Order responded
    to CPUC’s arguments by stating:
    “[C]onsistent with previous Commissions
    [sic] orders, we summarily accept PG&E’s
    request for a 50 basis point incentive ROE
    adder for its continued participation in [Cal-
    ISO] . . . Parties opposing PG&E’s request
    . . . have presented no new evidence or
    circumstances to warrant reexamining
    whether the adder is appropriate in this
    proceeding.”
    TO 16 Initial Order at P 30 (footnotes omitted). The TO 17
    Initial Order held similarly:
    “[C]onsistent with previous Commission
    orders, we accept PG&E’s request for a 50
    basis point incentive ROE adder for its
    continued participation in [Cal-ISO] . . .
    PG&E is a member of [Cal-ISO] . . . and its
    membership is ongoing; therefore, PG&E is
    presumed to be eligible for this incentive
    adder in accordance with Order No. 679.”
    TO 17 Initial Order at P 23 (footnotes omitted). FERC
    rejected CPUC’s argument that the incentive adder was not
    justified because it did not “induce” PG&E’s continuing
    membership in the Cal-ISO: “Notwithstanding CPUC’s
    argument asserting that PG&E’s participation is not voluntary
    CPUC V. FERC                            9
    because it is mandated by state law, it is within the
    Commission’s authority to grant incentive adders as
    described in Order No. 679.” 
    Id. at P
    24. FERC also rejected
    CPUC’s argument that it had created a generic adder, stating
    that PG&E had demonstrated that it was a Cal-ISO member
    and “thus satisfied the criteria set forth in Order No. 679.” 
    Id. at P
    25.
    CPUC sought rehearing of both FERC orders. CPUC
    explained that FERC erred by granting PG&E an incentive
    adder even though it was not free to leave the Cal-ISO;
    failing to respond to CPUC’s arguments about PG&E’s
    involuntary membership in the Cal-ISO; and granting a
    generic adder inconsistent with Order 679. FERC denied
    CPUC’s rehearing requests. Pac. Gas & Elec. Co.,
    154 FERC ¶ 61,119 at P 10 (2016) (“TO 16 Reh’g Order”);
    Pac. Gas & Elec. Co., 154 FERC ¶ 61,118 at P 9 (2016) (“TO
    17 Reh’g Order”). In response to CPUC’s claims that PG&E
    was not free to leave the Cal-ISO, FERC stated that Order
    679 “is clear that the Commission may grant incentive adders
    for public utilities that join and/or continue to remain in”
    transmission organizations and that the order does not
    “require that the Commission discontinue such adders in the
    face of arguments like those that CPUC has made here.” TO
    16 Reh’g Order at P 10; TO 17 Reh’g Order at P 9.
    In response to CPUC’s claims that FERC had adopted a
    generic adder, FERC stated that utilities with ongoing
    membership in transmission organizations are “presumed
    eligible” for the adder and that CPUC “concedes” that PG&E
    had an ongoing membership in the Cal-ISO. TO 16 Reh’g
    Order at P 11; TO 17 Reh’g Order at P 11. FERC added that
    because PG&E’s membership in the Cal-ISO helps the Cal-
    ISO to “fulfill its duties,” FERC found the incentive adders
    10                     CPUC V. FERC
    “to be justified.” TO 16 Reh’g Order at P 12; TO 17 Reh’g
    Order at P 10.
    Finally, FERC asserted that CPUC’s objection amounted
    to a “collateral attack” on Order 679 and Order 679-A that it
    did not need to address. TO 16 Reh’g Order at P 13; TO 17
    Reh’g Order at P 12. CPUC timely petitioned for review.
    II
    FERC has jurisdiction over the two transmission owner
    rate filings (TO 16 and TO 17) that initiated the instant
    proceedings pursuant to section 205 of the FPA. See
    16 U.S.C. § 824d. We have jurisdiction to review “order[s]
    issued by the Commission” under section 313(b) of the FPA.
    See 16 U.S.C. § 825l(b). All parties to this petition for review
    agree that the incentive adder issue was definitively resolved
    by FERC in the orders under review.
    We review a decision by FERC to determine whether its
    action was “arbitrary, capricious, an abuse of discretion, or
    otherwise not in accordance with law.” 5 U.S.C. § 706(2),
    see also Fall River Rural Elec. Coop., Inc. v. FERC, 
    543 F.3d 519
    , 525 (9th Cir. 2008). “A court is not to ask whether a
    regulatory decision is the best one possible or even whether
    it is better than the alternatives.” FERC v. Elec. Power
    Supply Ass’n, 
    136 S. Ct. 760
    , 782 (2016). Rather, the court
    must uphold a decision if the agency has “examined the
    relevant considerations and articulated a satisfactory
    explanation for its action, including a rational connection
    between the facts found and the choice made.” 
    Id. (quoting Motor
    Vehicle Mfrs. Ass’n of United States, Inc. v. State
    Farm Mut. Auto. Ins. Co., 
    463 U.S. 29
    , 43 (1983)) (alterations
    normalized). Our review “is limited to . . . the administrative
    CPUC V. FERC                           11
    record,” Envtl. Coal. of Ojai v. Brown, 
    72 F.3d 1411
    , 1414
    (9th Cir. 1995), and to those “grounds upon which . . . the
    record discloses that [the agency’s] action was based.” SEC
    v. Chenery Corp., 
    318 U.S. 80
    , 87 (1943).
    III
    FERC’s determination that PG&E was entitled to
    incentive adders for remaining in the Cal-ISO was arbitrary
    and capricious. FERC did not reasonably interpret Order 679
    as justifying summary grants of adders for remaining in a
    transmission organization. Because its interpretation was
    unreasonable, FERC’s grants of adders to PG&E were an
    unexplained departure from longstanding policy. Moreover,
    FERC created a generic adder in violation of the order.
    A
    FERC’s interpretation of Order 679 as justifying
    summary grants of incentive adders to utilities that remain in
    transmission organizations was not reasonable.
    Under Auer v. Robbins, 
    519 U.S. 452
    (1997), we defer to
    an agency’s interpretation of its own ambiguous regulation
    unless that interpretation is “plainly erroneous or inconsistent
    with the regulation, or there is reason to suspect that the
    interpretation does not reflect the agency’s fair and
    considered judgment on the matter in question.” W. Radio
    Servs. Co. v. Qwest Corp., 
    678 F.3d 970
    , 984–85 (9th Cir.
    2012) (internal citation omitted).
    FERC interprets Order 679 as conferring on it “the
    authority. . . to continue to grant incentive adders for electric
    utilities . . . that remain members of regional transmission
    12                    CPUC V. FERC
    organizations” without further inquiry into the voluntariness
    of their membership. Brief of Respondent at 20. FERC notes
    that Order 679 makes an entity presumptively eligible to
    receive an adder if it demonstrates continuing membership in
    a transmission organization. See Order 679 at P 327. FERC
    appears to interpret the “presumed to be eligible” language as
    absolving it of an obligation to consider whether the
    presumption should apply to utilities that are prohibited from
    withdrawing from transmission organizations without the
    consent of a higher authority. Under this interpretation,
    ongoing membership itself is the sole criterion for receipt of
    an incentive adder.
    1
    FERC’s interpretation of Order 679 is plainly erroneous
    and inconsistent with the regulation. Order 679 provides that
    a utility demonstrating that it has remained in a transmission
    organization is “presumed to be eligible” for an incentive
    adder. Order 679 at P 327. However, language throughout
    Orders 679 and 679-A suggests that the presumption of
    eligibility may be rebutted by the arguments CPUC has made
    and that ongoing membership is not sufficient for an
    incentive adder.
    The orders commit FERC to case-by-case review of
    incentive adders even for utilities that have demonstrated
    ongoing membership in transmission organizations. Order
    679 states that FERC “will approve, when justified, requests
    for ROE-based incentives for public utilities that join and/or
    continue to be a member of” transmission organizations.
    Order 679 at P 326 (emphasis added). If all utilities that
    continued to be members of transmission organizations
    automatically qualified for incentive adders, the “when
    CPUC V. FERC                         13
    justified” language would be surplusage. In the same
    paragraph, FERC declines proposals to “create a generic
    adder for such membership” and states that it will “consider
    specific incentives on a case-by-case basis.” 
    Id. If FERC’s
    interpretation were correct, case-by-case review would be
    meaningless.
    The justification for incentive adders as articulated in
    Order 679 also belies FERC interpretation of the order. The
    order states that the “basis for the incentive is a recognition
    of the benefits that flow from membership in [transmission]
    organizations and the fact that continuing membership is
    generally voluntary.” Order 679 at P 331 (emphasis added).
    When membership is not voluntary, the incentive is
    presumably not justified. Challenges to the presumption of
    eligibility for the incentive on such grounds would not be
    precluded by the order and would need to be addressed by
    FERC if raised in tariff filing proceedings.
    Order 679-A, citing section 219’s purpose of ensuring
    reliability and reducing the cost of power, describes incentive
    adders as “an inducement for utilities to join, and remain in,
    Transmission Organizations.” Order 679-A at P 86
    (emphasis added). An incentive cannot “induce” behavior
    that is already legally mandated. Thus, the voluntariness of
    a utility’s membership in a transmission organization is
    logically relevant to whether it is eligible for an adder. The
    same paragraph acknowledges that granting incentives only
    for joining transmission organizations “offers no inducement
    to stay in these organizations for members with the option to
    withdraw.” 
    Id. (emphasis added).
    Order 679-A thus
    distinguishes between utilities that have the option to
    withdraw from transmission organizations and those without
    14                     CPUC V. FERC
    the option, and it necessarily implies that incentives are
    justified only for the former.
    Finally, Order 679-A states that with respect to incentives
    under section 219, “[a] prior contractual commitment or
    statute may have a bearing on our nexus evaluation of
    individual applications.” Order 679-A at P 122. This also
    necessarily implies that ongoing membership in a
    transmission organization is not dispositive as to incentive
    adder eligibility.
    FERC argues that Orders 679 and 679-A considered and
    rejected the argument that the voluntariness of a utility’s
    membership in a transmission organization should bear on its
    eligibility for an incentive adder. Order 679 did decline to
    adopt proposals making utilities ineligible for incentives if
    they were ordered to join transmission organizations by
    statute. Order 679 at P 316; Order 679-A at P 83. However,
    this does not support FERC’s interpretation, which holds that
    utilities that remain in transmission organizations qualify for
    adders even when their continued participation is compelled
    by statute. No party to the Order 679 proceedings raised the
    issue of whether a utility could qualify for an incentive for its
    involuntary continued participation in a transmission
    organization.
    The text of Orders 679 and 679-A makes it clear that
    FERC’s interpretation of those orders is plainly erroneous and
    inconsistent with the regulations. The orders did not make
    ongoing membership in a transmission organization the sole
    criterion for an incentive adder, and the orders did not
    preclude challenges based on the voluntariness of a utility’s
    membership in a transmission organization. We decline to
    defer to FERC’s interpretation of the orders.
    CPUC V. FERC                           15
    2
    Even if not plainly erroneous, an agency’s interpretation
    is not owed deference if “there is reason to suspect that the
    interpretation does not reflect the agency’s fair and
    considered judgment on the matter in question.” W. Radio
    Servs. 
    Co., 678 F.3d at 985
    . “Indicia of inadequate
    consideration include . . . signs that the agency’s
    interpretation amounts to no more than a convenient litigating
    position; or an appearance that the agency’s interpretation is
    no more than a post hoc rationalization advanced by an
    agency seeking to defend past agency action against attack.”
    Price v. Stevedoring Servs. of Am., Inc., 
    697 F.3d 820
    ,
    829–30 n.4 (9th Cir. 2012) (en banc) (internal quotation
    marks and citations omitted).
    FERC’s interpretation of Order 679 is a post hoc
    rationalization of its actions. FERC never before explicitly
    articulated the interpretation it relies on, even though, as the
    author of Order 679, it could have easily incorporated the
    interpretation into the order. Order 679 provides that utilities
    that demonstrate ongoing membership in transmission
    organizations will be “presumed to be eligible” for incentive
    adders, but it is silent as to whether that presumption can be
    rebutted for utilities that cannot voluntarily leave their
    organizations. Order 679 at P 327. Nowhere does Order 679
    state that the voluntariness of a utility’s membership is
    irrelevant to its eligibility for an incentive adder, even though
    this would have been a reasonably foreseeable challenge to
    future adders. By observing that transmission organization
    membership was “generally voluntary,” FERC indicated that
    it knew that some utilities could not voluntarily leave. Order
    679 at P 331 (emphasis added). FERC could have foreseen
    a challenge like CPUC’s challenge here.
    16                     CPUC V. FERC
    Nor did FERC clearly articulate its interpretation in the
    two orders currently on review. In denying CPUC’s
    rehearing requests for the TO 16 and TO 17 orders, FERC
    merely stated that “it is within the Commission’s authority to
    grant incentive adders as described in Order No. 679,” that
    Order 679 “is clear that the Commission may grant incentive
    adders for public utilities that join and/or continue to remain
    in” transmission organizations, and that Order 679 does not
    “require that the Commission discontinue such adders in the
    face of arguments like those that the CPUC has made here.”
    TO 16 Reh’g Order at P 10; TO 17 Reh’g Order at P 9.
    These statements do not reflect a fair and considered
    judgment on the meaning of Order 679.
    It is apparent that FERC’s interpretation of Order 679 is
    merely a convenient litigating position and a post hoc
    rationalization of the orders on review. We decline to defer
    to the interpretation.
    3
    “[W]hen Auer deference is not warranted, an agency’s
    interpretation of an ambiguous regulation should be evaluated
    under the principle articulated in Skidmore v. Swift & Co.,
    
    323 U.S. 134
    (1944).” Indep. Training & Apprenticeship
    Program v. Cal. Dep’t of Indus. Relations, 
    730 F.3d 1024
    ,
    1035 (9th Cir. 2013). Under this standard, this court gives an
    agency’s interpretation “a measure of deference proportional
    to the thoroughness evident in its consideration, the validity
    of its reasoning, its consistency with earlier and later
    pronouncements, and all those factors which give it the power
    to persuade.” 
    Id. at 1036
    (quoting Christopher v. SmithKline
    Beecham Corp., 
    567 U.S. 142
    , 159 (2012)) (internal quotation
    marks omitted).
    CPUC V. FERC                               17
    FERC’s interpretation does not reflect thorough
    consideration, nor is it persuasive in its own right. FERC
    does not develop or justify its interpretation in either the
    orders on review or in its briefing before this court; the
    interpretation is found only in FERC’s post-hoc reasoning.4
    We do not owe deference to such a “nominal” interpretation.
    Barboza v. Cal. Ass’n of Prof’l Firefighters, 
    799 F.3d 1257
    ,
    1267 (9th Cir. 2015). Moreover, as explained above, FERC’s
    interpretation is inconsistent with the text of Order 679 and
    Order 679-A and the evident purposes of those regulations.
    In light of our conclusion that FERC’s interpretation is
    neither entitled to Auer deference nor persuasive in its own
    right, we employ traditional tools of interpretation to
    determine whether Order 679 permits challenges to the
    presumption of eligibility of the sort CPUC has lodged here.
    Christopher v. SmithKline Beecham 
    Corp., 567 U.S. at 161
    .
    The order’s plain language and purpose show that it does. A
    utility that joins a regional transmission organization is
    “presumed to be eligible” for incentive adders under Order
    679, but this presumption is rebuttable. Order 679 at P 327.
    Given the order’s evident purpose of inducing utilities to
    voluntarily remain in transmission organizations, and given
    its language specifying that incentives will be awarded “when
    justified” and on a “case-by-case basis,” it permits challenges
    to incentives on the grounds that they will not induce
    continuing participation in transmission organizations. 
    Id. at 4
          In a proceeding subsequent to the orders on review here, FERC
    offered for the first time an explicit interpretation of the “presumption”
    provision in Order 679, in line with the implicit interpretation at issue
    here. See Pac. Gas & Elec. Co., 160 FERC ¶ 61,090 at P 13 (Sept. 20,
    2017). Because this interpretation was not advanced in the two orders on
    review here, it could not sustain those orders even if we were to consider
    it.
    18                    CPUC V. FERC
    P 326. Challenges such as that mounted by CPUC are not
    precluded and must be answered by FERC.
    B
    Given that its interpretation of Order 679 is not
    controlling, FERC failed to provide a reasoned explanation
    for its actions in the orders under review. An agency must
    “articulate a satisfactory explanation for its action.” Motor
    Vehicle Mfrs. 
    Ass’n, 463 U.S. at 43
    . When an agency
    changes policy, the requirement that it provide a reasoned
    explanation for its action demands, at a minimum, that the
    agency “display awareness that it is changing position.” FCC
    v. Fox Television Stations, Inc., 
    556 U.S. 502
    , 515 (2009).
    “An agency may not, for example, depart from a prior policy
    sub silentio or simply disregard rules that are still on the
    books.” 
    Id. FERC had
    a longstanding policy that incentives should
    only be awarded to induce future behavior. FERC departed
    from this policy without acknowledgment or explanation.
    This departure was arbitrary and capricious.
    1
    FERC has a longstanding policy that rate incentives must
    be prospective and that there must be a connection between
    the incentive and the conduct meant to be induced. This
    policy is incorporated in Order 679. The policy prohibits
    FERC from rewarding utilities for past conduct or for conduct
    which they are otherwise obligated to undertake.
    This longstanding policy is evinced in a series of FERC
    decisions and statements. In 2001, FERC denied a committee
    CPUC V. FERC                          19
    of utilities an incentive for a maintenance/construction pilot
    project. FERC reasoned that awarding the incentive would
    “unjustly reward” the committee “for doing what it is
    supposed to do, i.e., to adequately maintain its facilities in a
    prudent, cost-effective manner.” New England Power Pool,
    97 FERC ¶ 61,093 at 61,477 (2001), order on reh’g,
    98 FERC ¶ 61,249 (2002). In a 2001 case, FERC found that
    retroactive incentives are ineffective, since the utilities that
    would receive the incentives “would have already made their
    decisions.” ISO New England, 96 FERC ¶ 61,359 at 62,355
    (2001), aff’d Sithe New England Holdings, LLC v. FERC,
    
    308 F.3d 71
    , 78 (1st Cir. 2002). A 1992 FERC policy
    statement makes its position clear: “Consideration of past
    performance would violate the standard that incentive
    ratemaking must be prospective. . . . Incentive regulation can
    produce superior results over traditional regulation only if it
    is prospective.” Incentive Ratemaking for Interstate Nat. Gas
    Pipelines, Oil Pipelines, & Elec. Utilities, 61 FERC ¶ 61,168
    at 61,599 (1992). In 2006, prior to the adoption of Order 679,
    FERC denied Southern California Edision Company (“SCE”)
    an incentive for joining the Cal-ISO because SCE was
    already a member. FERC stated that SCE “need[ed] no
    inducement” to join the Cal-ISO, because it was already a
    member. S. Cal. Edison Co., 114 FERC ¶ 61,018 at P 15
    (2006).
    FERC argues that this longstanding policy predates, and
    is implicitly superseded by, Order 679. Order 679 did
    explicitly reverse the holding in S. Cal. Edison, in which
    FERC had denied SCE an incentive for joining the Cal-ISO
    because SCE was already a Cal-ISO member. In Order 679-
    A, FERC stated that its decision in S. Cal. Edison “failed to
    recognize that incentives are equally important in inducing
    utilities to join and remain in Transmission Organizations.”
    20                     CPUC V. FERC
    Order 679-A at P 86 n.142. However, this statement did not
    overrule FERC’s policy of awarding incentives to induce
    future voluntary conduct. FERC overruled its policy barring
    incentives to utilities for remaining in transmission
    organizations, but it still treated such incentives as
    prospective: they were premised on the fact that membership
    in transmission organizations was “generally voluntary,” and
    thus that utilities may need incentives to choose to remain in
    such organizations. Order 679 at P 331. FERC’s policy of
    only providing incentives to induce future voluntary conduct
    was still in place as of the TO 16 and TO 17 orders.
    2
    Awarding PG&E incentive adders was a departure from
    FERC’s longstanding policy that incentives should only be
    awarded to induce voluntary conduct. This unacknowledged
    and unexplained departure from policy was arbitrary and
    capricious.
    In the initial orders and on rehearing, FERC did not
    acknowledge its longstanding policy, nor did it provide an
    explanation for its departure from that policy. It merely
    asserted that it had the authority to grant incentive adders to
    PG&E and that CPUC’s voluntariness arguments were
    irrelevant to adder eligibility. FERC’s statements would only
    explain its actions if its interpretation of Order 679 were
    correct. Because that interpretation is erroneous, the orders
    on review were a departure from Order 679’s terms and the
    longstanding policy it incorporates.            Without any
    CPUC V. FERC                               21
    acknowledgment or explanation of that departure, the orders
    were arbitrary and capricious.5
    C
    FERC also acted arbitrarily and capriciously by creating
    a generic adder in contravention of Order 679’s requirement
    of case-by-case review of adders.
    Order 679 provides that FERC will approve incentive
    adder requests “when justified” and will evaluate such
    requests “on a case-by-case basis.” Order 679 at P 326.
    Order 679 explicitly rejected a proposal to adopt a generic 50-
    basis-point incentive adder for ongoing transmission
    organization membership. 
    Id. In its
    challenges to PG&E’s tariff filings, CPUC argued
    that incentive adders could not induce PG&E to remain in the
    Cal-ISO since its membership was involuntary. FERC
    ignored this argument and “summarily accept[ed]” PG&E’s
    5
    FERC and PG&E each argue that PG&E’s participation in the Cal-
    ISO is, in fact, voluntary. FERC argues that even if PG&E is not free to
    leave the Cal-ISO without CPUC’s consent, “that still does not
    demonstrate that [PG&E] is forbidden from seeking to leave the [Cal-
    ISO],” and that PG&E “could take steps, with California’s approval, to
    voluntarily leave the [Cal-ISO].” Brief of Respondent at 23–24. PG&E
    goes a step further and argues that its withdrawal from membership in the
    Cal-ISO is not subject to CPUC approval. Brief of PG&E as Respondent-
    Intervenor at 22–25. These arguments, even if correct, could not sustain
    the orders on review, as they do not appear anywhere in those orders. We
    can only uphold agency action on grounds articulated by the agency in its
    orders; we “may not accept appellate counsel’s post hoc rationalizations
    for agency action.” Or. Nat. Desert Ass’n v. Bureau of Land Mgmt.,
    
    531 F.3d 1114
    , 1141 (9th Cir. 2008) (quoting Motor Vehicle Mfrs. 
    Ass’n, 463 U.S. at 50
    ).
    22                     CPUC V. FERC
    adder request “consistent with previous Commission orders.”
    TO 16 Initial Order at P 30; TO 17 Initial Order at P 23. It
    reiterated this position on rehearing. TO 16 Reh’g Order at
    P 11; TO 17 Reh’g Order at P 11. FERC also asserted that an
    adder is not “generic” simply because other utilities have
    received the same adder. TO 16 Reh’g Order at P 13 & n.26
    (citing Midcontinent Indep. Sys. Operator, Inc., 161 FERC ¶
    62,269 at P 14 (2015)); TO 17 Reh’g Order, at P 11 & n.22
    (same).
    When Order 679 is read in accordance with its plain
    language and evident purpose, it is clear that FERC has
    created a generic adder in violation of its provisions. To
    satisfy Order 679’s case-by-case analysis requirement and to
    avoid creating a generic adder, FERC needed to inquire into
    PG&E’s specific circumstances, i.e., whether it could
    unilaterally leave the Cal-ISO and thus whether an incentive
    adder could induce it to remain in the Cal-ISO. The fact that
    the other utilities have received the same adder does not make
    it generic; it is the fact that the adders were granted
    summarily without any case-specific inquiry into the
    circumstances of PG&E’s membership that made them
    generic. FERC’s summary grants are an unacknowledged
    and unexplained departure from Order 679. The orders on
    review are arbitrary and capricious. 
    Fox, 556 U.S. at 515
    .
    IV
    CPUC’s petition is not an impermissible collateral attack
    on Order 679. Under the FPA, this court’s “jurisdiction . . .
    is limited to review of new orders,” and the court does not
    have jurisdiction over a petition for review “that collaterally
    attacks a prior FERC order.” Pac. Gas & Elec. Co. v. FERC,
    
    464 F.3d 861
    , 868 (9th Cir. 2006). A petition for review
    CPUC V. FERC                          23
    under the FPA is a collateral attack on a prior FERC order if
    the order upon which the petition is based is a “clarification,”
    as opposed to a “modification,” of the prior order. 
    Id. To differentiate
    between a clarification and a modification, the
    court asks “whether a reasonable party in the petitioner’s
    position would have perceived a very substantial risk that the
    original order meant what the Commission now says it
    meant.” 
    Id. at 868–69
    (citation and alterations omitted).
    For the same reasons that FERC’s interpretation of Order
    679 is inconsistent with the regulation, a reasonable party in
    CPUC’s position would not have perceived a very substantial
    risk that FERC would interpret Order 679 as precluding its
    challenges. To the extent that FERC now interprets Order
    679 as precluding such challenges, this interpretation
    constitutes a modification, and CPUC’s challenge is not an
    impermissible collateral attack on the original order.
    FERC makes two additional arguments in support of its
    collateral attack claim. First, FERC argues that CPUC’s
    petition is a collateral attack on Order 679 because CPUC is
    advancing the same argument that FERC considered and
    rejected in 2006: that utilities legally mandated to join
    transmission organizations should not be eligible to receive
    incentive adders. However, this is not the challenge CPUC
    is making. CPUC challenges incentive adders for remaining
    in a transmission organization when a utility is not free to
    leave. No party to the Order 679 proceeding raised the issue
    of whether a utility could qualify for an incentive adder for
    continued participation in a transmission organization when
    such participation was not voluntary. CPUC was not
    precluded from making such a challenge to the orders on
    review.
    24                    CPUC V. FERC
    Second, FERC argues that CPUC had sufficient notice
    that PG&E was eligible for an incentive adder because it has
    been a party to each of the annual proceedings since 2007 in
    which FERC approved PG&E’s requests for incentive adders.
    This argument is also unpersuasive. CPUC settled the
    proceedings granting PG&E’s first incentive adder in 2007,
    as well as every other proceeding that followed. Each one of
    those orders stated that FERC’s approval of the settlement did
    not constitute precedent regarding any issue or principle
    raised in the proceeding. FERC cannot now cite these
    settlement approvals as putting CPUC on notice that it was
    precluded from challenging future incentive adders.
    Neither Order 679 nor the settlement approval orders that
    followed gave CPUC sufficient notice that Order 679
    precluded challenges to incentive adder eligibility on the
    ground that a utility’s membership in a transmission
    organization is involuntary. CPUC’s petition is thus not an
    impermissible collateral attack on Order 679.
    V
    We grant CPUC’s petition for review and remand to
    FERC for further proceedings consistent with this opinion.
    We need not, and do not, reach any other issue urged by the
    parties.
    PETITION GRANTED.