Puc of the State of California v. Ferc , 462 F.3d 1027 ( 2006 )


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  •                                                           FILED
    FOR PUBLICATION                  AUG 31 2006
    CATHY A. CATTERSON, CLERK
    UNITED STATES COURT OF APPEALS          U.S. COURT OF APPEALS
    FOR THE NINTH CIRCUIT
    PUBLIC UTILITIES COMMISSION OF       No. 01-71051
    THE STATE OF CALIFORNIA,
    FERC No. FERC-EL00-000
    Petitioner,
    PUBLIC UTILITIES COMMISSION OF       AMENDED OPINION
    NEVADA; ALLEGHENY ENERGY
    SUPPLY COMPANY, LLC,
    Petitioner-Intervenor,
    ENERGY PRODUCER
    COGENERATION COGENERATION
    ASSOCIATION OF CALIFORNIA AND
    ENERGY PRODUCERS AND USERS
    COALITION; AVISTA CORPORATION;
    PINNACLE WEST CAPITAL
    CORPORATION; CALIFORNIA
    ELECTRICITY OVERSIGHT BOARD;
    MIRANT CALIFORNIA; MIRANT
    DELTA LLC; MIRANT POTRERO LLC;
    MIRANT AMERICAS ENERGY
    MARKETING, LP; ENRON POWER
    MARKETING, INC.; SOUTHERN
    CALIFORNIA EDISON COMPANY;
    NORTHERN CALIF. TRANSMISSION
    AGENCY OF NORTHERN
    CALIFORNIA (“TANC”); MODESTO
    IRRIGATION DISTRICT (MID); M-S-R
    PUBLIC POWER AGENCY; CITY OF
    REDDING; CITY OF PALO ALTO;
    CITY OF SANTA CLARA; PORT OF
    SEATTLE WASHINGTON; CITY OF
    TACOMA, WASHINGTON; PUBLIC
    SERVICE COMPANY OF COLORADO;
    PACIFIC GAS AND ELECTRIC
    COMPANY; CORAL POWER, L.L.C.;
    EXELON CORP.; CITY & COUNTY OF
    SAN FRANCISCO; OFFICE OF
    ATTORNEY GENERAL FOR THE
    STATE OF NEVADA, BUREAU OF
    CONSUMER PROTECTION;
    PORTLAND GENERAL ELECTRIC
    COMPANY; AUTOMATED POWER
    EXCHANGE, INC.; ALLEGHEY
    ENERGY SUPPLY CO., LLC; PUGET
    SOUND ENERGY, Puget Sound Energy,
    Inc.; DYNEGY POWER MARKETING,
    INC.; EL SEGUNDO POWER LLC;
    LONG BEACH GENERATION LLC;
    CABRILLO POWER I LLC; CABRILLO
    POWER II LLC; PACIFICORP’S; PPL
    ENERGYPLUS, LLC; PPL MONTANA;
    PPL SOUTHWEST GENERATION
    HOLDINGS, LLC; RELIANT ENERGY
    POWER GENERATION, INC.;
    RELIANT ENERGY SERVICES, INC.;
    OERTHERN; PEOPLE OF THE STATE
    OF CALIFORNIA, ex rel. Bill Lockyer;
    WILLIAM ENERGY MARKETING &
    TRADING COMPANY; CALPINE
    CORPORATION; EL PASO
    MERCHANT ENERGY L.P.; SEMPRA
    ENERGY TRADING CORP.; AVISTA
    ENERGY, INC.; CITY OF LOS
    ANGELES; CITY OF LOS ANGELES
    DEPARTMENT OF WATER AND
    POWER; CALIFORNIA ELECTRICITY
    OVERSIGHT BOARD; IDACORP
    2
    ENERGY L.P.; CITY OF PASADENA,
    Intervenors,
    And
    INTERNATIONAL PACIFIC
    ENTERPRISES, LTD.,
    Intervenor,
    v.
    FEDERAL ENERGY REGULATORY
    COMMISSION,
    Respondent.
    PUBLIC UTILITIES COMMISSION OF       No. 01-71321
    THE STATE OF CALIFORNIA,
    FERC No. EL 00-95-000
    Petitioner,
    IDA CORP. ENERGY,, IDA Corp.
    Energy, L.P.,
    Petitioner-Intervenor,
    SAN DIEGO GAS AND ELECTRIC
    COMPANY; DUKE ENERGY NORTH
    AMERICA, LLC, DUKE ENERGY
    TRADING AND MARKETING, LLC,
    (COLLECTIVELY, “DUKE ENERGY”);
    CALIFORNIA ASSEMBLY;
    SOUTHERN CALIFORNIA EDISON
    3
    COMPANY; MIRANT AMERICAS
    ENERGY MARKETING, LP, MIRANT
    CA, LLC, MIRANT DELTA, LLC, AND
    MIRANT POTEREO, LLC
    (COLLECTIVELY, “MIRANT”;
    MIRANT CALIFORNIA, Mirant
    California, LLC; MIRANT DELTA, LLC
    IRAN; MIRANT POTRERO, LLC;
    PUGET SOUND ENERGY, Puget Sound
    Energy, Inc.; CALIFORNIA
    INDEPENDENT SYSTEM OPERATOR
    CORPORATION; CALPINE
    CORPORATION; ENRON POWER
    MARKETING, INC.; CORAL POWER,
    L.L.C.; TRANSMISSION AGENCY OF
    NORTHERN CALIFORNIA; THE M-S-R
    PUBLIC POWER AGENCY; THE
    MODESTO IRRIGATION DISTRICT;
    CITY OF PALO ALTO; THE CITY OF
    SANTA CLARA; CITY OF REDDING;
    EL PASO MERCHANT ENREGY, L.P.;
    NORTHERN CALIFORNIA POWER
    AGENCY; CHILD PROTECTIVE
    SERVICES; CONSTELLATION
    ENERGY COMMODITIES GROUP,
    INC.; WILLIAMS ENERGY
    MARKETING & TRADING COMPANY;
    CITY AND COUNTY OF SAN
    FRANCISCO; PUBLIC SERVICE
    COMPANY OF NEW MEXICO;
    CALIFORNIA ELECTRICITY
    OVERSIGHT BOARD; PEOPLE OF THE
    STATE OF CALIFORNIA; PEOPLE OF
    THE STATE OF CALIFORNIA;
    PACIFIC GAS AND ELECTRIC
    COMPANY; PPL ENERGY PLUS; PPL
    MONTANA; PPL SOUTHWEST
    4
    GENERATION HOLDINGS, LLC;
    SEMPRA ENERGY TRADING CORP.;
    AVISTA ENERGY, INC.; CITY OF LOS
    ANGELES; CITY OF LOS ANGELES
    DEPARTMENT OF WATER AND
    POWER; MARCIA HABER KAMINE;
    CITY OF LOS ANGELES
    DEPARTMENT OF WATER AND
    POWER; CITY OF TACOMA; PORT OF
    SEATTLE; PINNACLE WEST COS.;
    PUBLIC SERVICE COMPANY OF
    COLORADO; PORTLAND GENERAL
    ELECTRIC COMPANY; DYNEGY
    POWER MARKETING, INC., EL
    SEGUNDO POWER LLC, LONG
    BEACH GENERATION LLC,
    CABRILLO POWER I LLC, AND
    CABRILLO POWER II LLC
    (COLLECTIVELY, “DYNEGY”); CITY
    OF SAN DIEGO; CITY OF SAN DIEGO;
    PORTLAND GENERAL ELECTRIC
    COMPANY; CALIFORNIA
    ELECTRICITY OVERSIGHT BOARD;
    CALIFORNIA ELECTRICITY
    OVERSIGHT BOARD; PUBLIC
    UTILITIES COMMISSION OF
    NEVADA,
    Intervenors,
    v.
    FEDERAL ENERGY REGULATORY
    COMMISSION,
    Respondent.
    5
    CITY OF SAN DIEGO,                 No. 01-71544
    Petitioner,                  FERC No.
    CALIFORNIA PUBLIC UTILITIES
    COMMISSION; CITY OF TACOMA;
    PORT OF SEATTLE; SOUTHERN
    CALIFORNIA EDISON COMPANY;
    CALIFORNIA ELECTRICITY
    OVERSIGHT BOARD; PEOPLE OF
    STATE OF CALIFORNIA,
    Petitioner-Intervenor,
    PINNACLE WEST CAPITAL
    CORPORATION; ARIZONA PUBLIC
    SERVICE COMPANY; MORGAN
    STANLEY CAPITAL GROUP, INC.;
    MERRILL LYNCH CAPITAL
    SERVICES, INC.; PUBLIC SERVICE
    COMPANY OF COLORADO; LONG
    BEACH GENERATION LLC.;
    CABRILLO POWER I LLC; CABRILLO
    POWER II LLC.; CITY OF LOS
    ANGELES DEPARTMENT OF WATER
    AND POWER; TRANSPORTATION
    AGENCY OF NORTHERN
    CALIFORNIA; THE METROPOLITAN
    WATER DISTRICT OF SOURTHERN
    CALIFORNIA; THE M-S-R PUBLIC
    POWER AGENCY; THE MODESTO
    IRRIGATION DISTRICT; CITY OF
    PALO ALTO; CITY OF REDDING;
    CITY OF SANTA CLARA; CITY AND
    COUNTY OF SAN FRANCISCO; PPL
    MONTANA, LLC; PPL SOUTHWEST
    GENERATION HOLDINGS, LLC; EL
    6
    PASO MERCHANT ENERGY L.P.;
    SEMPRA ENERGY TRADING CORP.;
    AVISTA CORPORATION; AVISTA
    ENERGY, INC.; PPL ENERGYPLUS,
    LLC; PORTLAND GENERAL
    ELECTRIC COMPANY; EL SEGUNDO
    POWER LLC; LONG BEACH
    GENERATION LLC; CABRILLO
    POWER I LLC; CABRILLO POWER II
    LLC; TRANSMISSION AGENCY OF
    NORTHERN CALIFORNIA; PUBLIC
    SERVICE COMPANY OF NEW
    MEXICO; ENERGY PLUS, LLC, ET AL;
    CALIFORNIA ELECTRICITY
    OVERSIGHT BOARD; PUBLIC
    UTILITIES COMMISSION OF
    NEVADA,
    Intervenors,
    v.
    FEDERAL ENERGY REGULATORY
    COMMISSION,
    Respondent,
    NORTHERN CALIFORNIA POWER
    AGENCY; PACIFIC GAS AND
    ELECTRIC COMPANY; IDACORP
    ENERGY L.P.; PACIFICORP; MIRANT
    AMERICAS ENERGY MARKETING,
    LP, MIRANT CALIFORNIA, LLC,
    MIRANT DELTA, LLC, AND MIRANT
    POTRERO, LLC.; PUGET SOUND
    ENERGY; DYNEGY POWER
    MARKETING, INC., EL SEGUNDO
    7
    POWER LLC, LONG BEACH
    GENERATION LLC, CABRILLO
    POWER I LLC, AND CABRILLO
    POWER II LLC (COLLECTIVELY,
    “DYNEGY”); CORAL POWER, L.L.C.;
    CONSTELLATION ENERGY
    COMMODITIES GROUP, INC.; THE
    SALT RIVER PROJECT
    AGRICULTURAL IMPROVEMENT
    AND POWER DISTRICT; ENRON
    POWER MARKETING INC.,
    Respondent-Intervenor.
    POWEREX CORPORATION,                No. 02-70254
    Petitioner,                  FERC Nos. EL-0095-0004
    EL00-95-001
    M-S-R PUBLIC POWER AGENCY;
    MODESTO IRRIGATION DISTRICT
    (MID); CITY OF PALO ALTO; CITY OF
    REDDING; CITY OF SANTA CLARA;
    METROPOLITAN WATER DISTRICT
    OF SOUTHERN CALIFORNIA,
    Petitioner-Intervenor,
    AVISTA CORPORATION; CORAL
    POWER, L.L.C.; CONSTELLATION
    ENERGY COMMODITIES GROUP,
    INC.,
    Intervenors,
    v.
    8
    FEDERAL ENERGY REGULATORY
    COMMISSION,
    Respondent,
    PACIFICORP,
    Respondent-Intervenor.
    PACIFIC GAS AND ELECTRIC           No. 02-70266
    COMPANY,
    FERC Nos. EL00-95-000
    Petitioner,                            EL00-95-000
    ER01-607-000
    SOUTHERN CALIFORNIA EDISON                   EL00-95-017
    COMPANY; PORT OF SEATTLE                     EL00-95-012
    WASHINGTON; CITY OF TACOMA,                  EL00-95-031
    WASHINGTON; NEVADA POWER                     EL00-95-004
    COMPANY; SIERRA PACIFIC POWER                EL00-95-001
    COMPANY; CITY OF SEATTLE;
    AVISTA CORPORATION; CORAL
    POWER, L.L.C.; CONSTELLATION
    ENERGY COMMODITIES GROUP,
    INC.; PUBLIC UTILITIES
    COMMISSION OF NEVADA;
    TRANSALTA ENERGY MARKETING
    (CALIFORNIA), INC.,
    Intervenors,
    v.
    FEDERAL ENERGY REGULATORY
    COMMISSION,
    9
    Respondent,
    METROPOLITAN WATER DISTRICT
    OF SOUTHERN CALIFORNIA;
    NORTHERN CALIF. TRANSMISSION
    AGENCY OF NORTHERN
    CALIFORNIA (“TANC”); M-S-R
    PUBLIC POWER AGENCY; MODESTO
    IRRIGATION DISTRICT (MID); CITY
    OF PALO ALTO; CITY OF REDDING,
    CALIFORNIA; CITY OF SANTA
    CLARA; PACIFICORP,
    Respondent-Intervenor.
    CALIFORNIA ELECTRICITY                  No. 02-70275
    OVERSIGHT BOARD,
    FERC No. FERC-EL95-000
    Petitioner,
    PORT OF SEATTLE; CITY OF
    TACOMA; PEOPLE OF THE STATE OF
    CALIFORNIA; CITY OF PASADENA;
    CITY OF SAN DIEGO; CA STATE
    ASSEMBLY,
    Petitioners - Intervenors,
    v.
    FEDERAL ENERGY REGULATORY
    COMMISSION,
    Respondent.
    10
    CITY OF SAN DIEGO,                    No. 02-70282
    Petitioner,                   FERC No. FERC-00-95-000
    CORAL POWER, L.L.C.;
    CONSTELLATION ENERGY
    COMMODITIES GROUP, INC.,
    Intervenors,
    And
    SOUTHERN CALIFORNIA EDISON
    COMPANY; PORT OF SEATTLE; CITY
    OF TACOMA,
    v.
    FEDERAL ENERGY REGULATORY
    COMMISSION,
    Respondent,
    PACIFICORP,
    Respondent-Intervenor.
    CITY OF OAKLAND, CALIFORNIA           No. 02-70285
    ACTING BY AND THROUGH ITS
    BOARD OF PORT COMMISSIONERS,          FERC No. FERC-00-95-000
    Petitioner,
    CORAL POWER, L.L.C.;
    CONSTELLATION ENERGY
    11
    COMMODITIES GROUP, INC.,
    Intervenors,
    v.
    FEDERAL ENERGY REGULATORY
    COMMISSION,
    Respondent,
    PACIFICORP,
    Respondent-Intervenor.
    SAN DIEGO GAS & ELECTRIC            No. 02-70301
    COMPANY,
    FERC No. 02-1058
    Petitioner,
    CALIFORNIA ATTORNEY GENERAL,
    Intervenor,
    CORAL POWER, L.L.C.;
    CONSTELLATION ENERGY
    COMMODITIES GROUP, INC.,
    Intervenors,
    v.
    FEDERAL ENERGY REGULATORY
    COMMISSION,
    12
    Respondent.
    SOUTHERN CALIFORNIA EDISON        No. 02-72113
    COMPANY,
    FERC No. EL-95-000
    Petitioner,
    PORTLAND GENERAL ELECTRIC
    COMPANY; DYNEGY POWER
    MARKETING INC,.; EL SEGUNDO
    POWER; LONG BEACH GENERATION
    LLC; CABRILLO POWER; CABRILLO
    POWER II LLC; MORGAN STANLEY
    CAPITAL GROUP, INC.; AVISTA
    ENERGY; PUGET SOUND
    INVESTMENT GROUP; THE CITY OF
    LOS ANGELES DEPARTMENT OF
    WATER AND POWER; SEMPRA
    ENERGY; CALIFORNIA POWER
    AGENCY; MODESTO IRRIGATION
    DISTRICT (MID); METROPOLITAN
    WATER DISTRICT OF SOUTHERN
    CALIFORNIA; EL PASO MERCHANT
    ENERGY L.P.; POWEREX
    CORPORATION; CORAL POWER,
    L.L.C.; MIRANT AMERICAS ENERGY
    MARKETING, LP; MIRANT
    CALIFORNIA, LLC; MIRANT DELTA,
    LLC IRAN; MIRANT POTRERO, LLC;
    TRANSCANADA ENERGY LTD.; CITY
    OF TACOMA, Washington; PORT OF
    SEATTLE, Washington,
    Intervenors,
    13
    v.
    FEDERAL ENERGY REGULATORY
    COMMISSION,
    Respondent.
    PACIFIC GAS AND ELECTRIC           No. 03-73887
    COMPANY,
    FERC No. Federal Power Act
    Petitioner,
    DYNEGY POWER MARKETING INC,.;
    EL SEGUNDO POWER; LONG BEACH
    GENERATION LLC; ENRON POWER
    MARKETING, INC.; PUBLIC UTILITY
    DISTRICT NO. 1 OF SNOHOMISH
    COUNTY, WASHINGTON; ENRON
    ENERGY SERVICES, INC.;
    CALIFORNIA ELECTRICITY
    OVERSIGHT BOARD; PEOPLE OF
    CALIFORNIA; CALIFORNIA PUBLIC
    UTILITIES COMMISSION;
    CALIFORNIA INDEPENDENT
    SYSTEM OPERATOR CORPORATION;
    M-S-R PUBLIC POWER AGENCY;
    MODESTO IRRIGATION DISTRICT
    (MID); CITY OF SANTA CLARA; CITY
    OF REDDING; CORAL POWER;
    CONSTELLATION ENERGY
    COMMODITIES GROUP, INC.;
    POWEREX CORP; THE SALT RIVER
    PROJECT AGRICULTURAL
    IMPROVEMENT AND POWER
    DISTRICT; SACRAMENTO
    14
    MUNICIPAL UTILITY DISTRICT;
    SOUTHERN CALIFORNIA EDISON
    COMPANY; TUCSON ELECTRIC
    POWER COMPANY; PORTLAND
    GENERAL ELECTRIC COMPANY;
    PINNACLE WEST CAPITAL
    CORPORATION; ARIZONA PUBLIC
    SERVICE COMPANY; PACIFICORP;
    PUBLIC SERVICE COMPANY OF NEW
    MEXICO; NORTHERN CALIFORNIA
    POWER AGENCY; TRACTEBEL
    ENERGY MARKETING INC.; BP
    ENERGY COMPANY; AVISTA
    ENERGY; PUGET SOUND ENERGY;
    CITY OF LOS ANGELES
    DEPARTMENT OF WATER AND
    POWER; AVISTA CORPORATION;
    SEMPRA ENERGY; EL PASO
    MERCHANT ENERGY L.P.; IDACORP
    ENERGY; BP ENERGY CO.;
    WILLIAMS POWER COMPANY, INC;
    PORT OF SEATTLE; TRANSCANADA
    ENERGY LTD.; EXELON CORP,
    Intervenors,
    v.
    FEDERAL ENERGY REGULATORY
    COMMISSION,
    Respondent.
    SACRAMENTO MUNICIPAL UTILITY     No. 03-74252
    DISTRICT,
    15
    Petitioner,                 FERC No. Federal Power Act
    v.
    FEDERAL ENERGY REGULATORY
    COMMISSION,
    Respondent.
    STATE WATER CONTRACTORS; THE       No. 03-74527
    METROPOLITAN WATER DISTRICT
    OF SOUTHERN CALIFORNIA,            FERC No. EL00-95-081
    Petitioners,
    TRANSCANADA ENERGY;
    CALIFORNIA INDEPENDENT
    SYSTEM OPERATOR CORPORATION;
    POWEREX CORP.; PACIFICORP;
    TUCSON ELECTRIC POWER
    COMPANY; PINNACLE WEST
    CAPITAL CORPORATION; PACIFIC
    GAS AND ELECTRIC COMPANY;
    CALIFORNIA POWER AGENCY;
    PEOPLE OF THE STATE OF
    CALIFORNIA; CALIFORNIA PUBLIC
    UTILITIES COMMISSION; POWEREX
    CORP.; SOUTHERN CALIFORNIA
    EDISON COMPANY; CALIFORNIA
    ELECTRICITY OVERSIGHT BOARD;
    WILLIAMS POWER COMPANY, INC.;
    M-S-R PUBLIC POWER AGENCY;
    MODESTO IRRIGATION DISTRICT
    (MID); CITY OF SANTA CLARA; CITY
    OF REDDING; CONSTELLATION
    16
    ENERGY COMMODITIES GROUP,
    INC.; CITY OF VERNON,
    Intervenors,
    v.
    FEDERAL ENERGY REGULATORY
    COMMISSION,
    Respondent.
    MODESTO IRRIGATION DISTRICT        No. 03-74531
    (MID),
    FERC No. EL00-95-081
    Petitioner,
    v.
    FEDERAL ENERGY REGULATORY
    COMMISSION,
    Respondent.
    PEOPLE OF THE STATE OF             No. 03-74594
    CALIFORNIA EX REL. BILL
    LOCKYER,                           FERC No.
    Petitioner,
    CALIFORNIA INDEPENDENT
    SYSTEM OPERATOR CORPORATION,
    Intervenor,
    17
    v.
    FEDERAL ENERGY REGULATORY
    COMMISSION,
    Respondent.
    CITY OF LOS ANGELES                             No. 04-73501
    DEPARTMENT OF WATER AND
    POWER,                                          FERC No. Federal Power Act
    Petitioner,
    v.
    FEDERAL ENERGY REGULATORY
    COMMISSION,
    Respondent.
    On Petition for Review of an Order of the
    Federal Energy Regulatory Commission
    Argued and Submitted April 13, 2005
    San Diego, CA
    Filed
    Before: THOMAS, McKEOWN, and CLIFTON, Circuit Judges.
    Opinion by Judge Sidney R. Thomas
    18
    THOMAS, Circuit Judge:
    This case comes to us on petitions for review of a series of orders issued by
    the Federal Energy Regulatory Commission (“FERC”) relating to the energy crisis
    that occurred in California in 2000 and 2001. Nearly 200 petitions for review of
    the various FERC orders have been filed in our Court. We consolidated these
    petitions for administrative management.1
    On November 24, 2004, we issued a consolidated order in this case
    separating certain issues for decision in two consolidated proceedings, the first of
    which we termed the “Jurisdictional Cases”; the second we termed the
    “Scope/Transactions Cases.” In the Jurisdictional Cases, we considered whether
    FERC’s refund authority extended to certain governmental entities. We heard oral
    arguments on Jurisdictional Cases on April 12, 2005, and issued an opinion
    concerning the Jurisdictional Cases on September 6, 2005. Bonneville Power
    Admin. v. FERC, 
    422 F.3d 908
     (9th Cir. 2005).
    1
    We express our appreciation to Lisa Evans of the Ninth Circuit Court of
    Appeals Mediation Unit; Cole Benson, Supervisor of the Ninth Circuit Procedural
    Motions Unit; Cecilia Dennis, formerly with the Ninth Circuit Staff Attorney’s
    Office; and our colleague Judge Edward Leavy for their extensive work with the
    parties in organizing judicial management of the cases. We also express our
    appreciation to the parties and their attorneys for their cooperation,
    professionalism, and the quality of their presentations.
    19
    The Scope/Transaction Cases before us here involve numerous questions
    pertaining to the proper scope of FERC’s refund orders, including the appropriate
    temporal reach and the type of transactions properly subject to the refund orders.
    We heard oral arguments on the Scope/Transaction Cases on April 13, 2005. This
    opinion covers the issues presented in the Scope/Transaction Cases.
    We grant in relief in part and deny relief in part. In general, we hold that all
    the transactions at issue in this case that occurred within the California Power
    Exchange Corporation (“CalPX”) or California Independent System Operator
    (“Cal-ISO”) markets, or as a result of a CalPX or Cal-ISO transaction, were the
    proper subject of the refund proceedings instituted by FERC. Therefore, we deny
    the petitions for review that challenge FERC’s inclusion of such transactions; we
    grant the petitions for review that challenge FERC’s exclusion of such transactions.
    We deny the petitions for review that seek to expand FERC’s refund
    proceedings into the bilateral markets beyond the CalPX and Cal-ISO markets. In
    particular, we hold that FERC properly excluded from the refund proceedings
    bilateral transactions between the California Energy Resources Scheduling
    (“CERS”) Division of the California Department of Water Resources and other
    entities that occurred outside the CalPX and Cal-ISO markets.
    20
    We hold that FERC properly established October 2, 2000 as the refund
    effective date for the § 206 proceedings, rather than October 29, 2000, as argued by
    some parties. However, we hold that FERC erred in excluding § 309 relief for
    tariff violations that occurred prior to October 2, 2000. We reserve consideration
    of all other issues raised in the various petitions for review for the next phase of
    our appellate proceedings.
    The net effect of our decision is to preserve the scope of the existing FERC
    refund proceedings, but to expand those refund proceedings to include: (1) tariff
    violations that occurred prior to October 2, 2000, (2) transactions in the CalPX and
    Cal-ISO markets that occurred outside the 24-hour period specified by FERC, and
    (3) energy exchange transactions in the CalPX and Cal-ISO markets.
    I
    Parties and Claims
    With that brief summary of the issues, we turn to the specific claims of the
    parties. The State of California and several intervenors (collectively, “the
    California Parties”)2 seek review of a number of FERC’s decisions, namely: (1)
    FERC’s denial of relief for sales of electricity made at unjust rates prior to October
    2
    The California Parties consist of the People of the State of California, ex
    rel Bill Lockyer, Attorney General; the Public Utilities Commission of the State of
    California; the California Electricity Oversight Board; Pacific Gas and Electric
    Company, and Southern California Edison Company.
    21
    2, 2000, the refund effective date set by FERC; (2) FERC’s denial of relief for
    energy sales in which CERS was the purchaser; (3) FERC’s refusal to order relief
    for energy exchange transactions; and (4) FERC’s refusal to order relief for certain
    forward market transactions.
    A group of energy suppliers and generators called the Competitive Suppliers
    Group3 also petitions for review of several of FERC’s decisions, namely: (1)
    FERC’s decision to set the refund effective date at October 2, 2000, rather than
    October 29, 2000; (2) FERC’s order of refunds for transactions that took place
    during non-emergency hours, and (3) FERC’s inclusion of certain out-of-market
    transactions in its refund proceedings.
    The Port of Oakland, along with other petitioners and intervenors, petitions
    for review of FERC’s decision to exclude certain bilateral transactions from its
    refund order.
    3
    This group consists of Powerex Corp.; Avista Energy, Inc.; Constellation
    Energy Commodities Group, Inc.; Coral Power, L.L.C.; Exelon Corporation on
    behalf of Exelon Generation Company, LLC; PECO Energy Company;
    Commonwealth Edison Company; IDACORP Energy LP; Portland General
    Electric Company; PPL EnergyPlus, LLC; PPL Montana, LLC; Public Service
    Company of New Mexico; Puget Sound Energy, Inc.; Sempra Energy Trading
    Corp.; TransAlta Energy Marketing (CA), Inc.; TransAlta Energy Marketing (US),
    Inc.; and Tucson Electric Power Company.
    22
    Also before us in this case are the Public Entities’4 and the Bonneville Power
    Administration’s petitions for review of FERC’s determination that it had authority
    to order relief for certain transactions known as “sleeve” and “multi-day”
    transactions, as well as transactions occurring under § 202(c) of the Federal Power
    Act. The California Parties have moved to strike, and El Paso Merchant Energy
    Company has moved to defer, consideration of the arguments until the next phase
    of our consideration of the FERC orders.
    II
    Factual Background
    During the mid-1990's, FERC began examining whether the wholesale
    electric power industry should have been restructured and deregulated to separate
    generation, transmission, and distribution functions. Generation involves the
    production of power through a variety of means. Transmission generally refers to
    the conveyance of high voltage electric power from the points of generation to
    substations for conversion to delivery voltages. Distribution refers to the delivery
    4
    This group consists of municipal entities, including the Modesto Irrigation
    District, the City of Los Angeles Department of Water and Power, the Sacramento
    Municipal Utility District, the City of Redding, and the State Water
    Contractors/The Metropolitan Water District of Southern California (which
    represents 27 of the 29 California public entities that provide substantial funding
    for the California Department of Water Resources’ operation of the State Water
    Project).
    23
    of the converted low voltage energy from substations to individual consumers. The
    theory behind separating these functions, known as “unbundling,” was that
    wholesale power competition would be promoted, and consumers would benefit, if
    public utilities were required to provide nondiscriminatory, open access,
    transmission. See Promoting Wholesale Competition Through Open Access
    Non-Discriminatory Transmission Services by Public Utilities, 
    60 Fed. Reg. 17,662
    (proposed April 7, 1995) (codified at 18 C.F.R.§ 35.0 et. seq.). This examination
    culminated in the issuance of FERC Order No. 888 in 1996. Order No. 888,
    Promoting Wholesale Competition Through Nondiscriminatory Transmission
    Services by Public Utilities, 
    61 Fed. Reg. 21,540
    , 21,541 (May 10, 1996) (“FERC
    Order No. 888”), on reh’g, 
    62 Fed. Reg. 12,274
     (Mar. 14, 1997), on reh’g, 
    62 Fed. Reg. 64,688
     (Dec. 9, 1997), on reh’g, 82 F.E.R.C. ¶ 61,046 (Jan. 20, 1998), aff’d
    Transmission Access Policy Study Group v. FERC, 
    225 F.3d 667
     (D.C. Cir. 2000)
    (per curiam), aff’d sub nom. New York v. FERC, 
    535 U.S. 1
     (2002). Among other
    provisions, FERC Order No. 888 included a series of regulations that provided for
    the creation of competitive markets for wholesale electric power, including the
    creation of independent regional transmission companies that would allow the
    development of a competitive electric transmission market.
    24
    Prior to these events, the California electricity market was composed of
    investor-owned utilities, whose generation, transmission, and distribution of
    electricity were vertically integrated and regulated by the California Public Utilities
    Commission (“CPUC”), the state agency charged with regulating retail electricity
    rates. 
    Cal. Pub. Util. Code § 451
    . The CPUC set retail electrical rates charged by
    the investor-owned utilities providing service in exclusive service territories.
    There are three major investor-owned utilities in California: Pacific Gas and
    Electric Company (“PG&E”), Southern California Edison Company (“Edison”),
    and San Diego Gas and Electric Company (“SDG&E”) .
    In response to FERC Order No. 888 and energy problems in 1995, the CPUC
    and the California legislature commenced initiatives to restructure the California
    electric energy industry. The aim was to convert California’s investor-owned,
    regulated utilities, to a deregulated market, in which the price of electricity would
    be established by competition, and consumers could select their electrical power
    supplier. The theory was that competition would lead to better service and a price
    reduction for consumers.
    Toward this end, the California legislature enacted Assembly Bill 1890 (“AB
    1890”). Act of September 23, 1996, 
    1996 Cal. Legis. Serv. 854
     (codified at 
    Cal. Pub. Util. Code §§ 330-398.5
    ). The deregulation was to proceed in several phases,
    25
    beginning with the deregulation of the wholesale electricity market. After a
    transition period during which the investor-owned utilities were to recover their
    “stranded costs” through fixed prices for electricity, the retail market was to be
    deregulated.5
    Under AB 1890, the major investor-owned, vertically integrated utilities
    were required to divest a substantial portion of their power generation plants,
    including fossil fuel generation plants (but excluding hydroelectric facilities and
    nuclear power plants), to unregulated, non-utility producers. This divestiture was
    accomplished by a process of market valuation, based on a discount of projected
    future revenue streams. See Order Instituting Rulemaking on Commission’s
    Proposed Policies Governing Restructuring California’s Electric Service Industry
    and Reforming Regulation, 64 CPUC 2d. 1, 
    1995 WL 792086
     (Dec. 20, 1995)
    5
    The California legislature recognized that the transition to a deregulated
    market would leave the investor-owned utilities with some unrecoverable
    “stranded costs.” “Stranded costs” are those costs, generally associated with
    facility construction, that cannot be recovered because either the charged rate is
    insufficient to cover the costs or the utility cannot sell enough power. In the case
    of sales made pursuant to the divestiture requirements, recoverable stranded costs
    meant the difference between the sales price and the book value of the assets.
    During the transition to a deregulated market, the investor-owned utilities were to
    recover certain stranded costs through individual cost-recovery plans, which
    provided that rates would be frozen for a period of time to allow the investor-
    owned utilities to generate sufficient profits to recover their stranded costs.
    26
    (“CPUC Decision 95-12-063”). Between 1998 and 1999, 22 electrical generation
    plants were sold.
    After divesting the bulk of their generation assets, the investor-owned
    utilities were required to sell all of their remaining output to CalPX, a nonprofit
    wholesale clearinghouse created by AB 1890. CalPX was to provide a centralized
    auction market for trading electricity. It was deemed a public utility pursuant to the
    Federal Power Act, see 
    16 U.S.C. § 824
    (e), and thus subject to regulation by
    FERC, see 
    16 U.S.C. § 824
    (b), (d). It operated pursuant to a FERC-approved tariff
    and FERC wholesale rate schedules. Pacific Gas & Elec. Co., 
    77 FERC ¶ 61,204
    at 61,803-05, (1996), reh’g denied, 
    81 FERC ¶ 61,122
     (1997). The investor-owned
    utilities were required to purchase all of electrical energy that they required from
    the CalPX markets and to conduct all of their sales through the CalPX market. Part
    of the underlying theory was that the investor-owned utilities could not exercise
    market power in a single transparent market, either as a buyer or a seller, because
    prices would be posted and all market participants would be paid the same price.
    CalPX commenced operations in 1998. Initially, it operated only a single
    price auction for its “spot markets,” defined as “sales that are 24 hours or less and
    that are entered into the day of or day prior to delivery.” San Diego Gas & Elec.
    Co., et. al., 
    95 FERC ¶ 61,418
     at 62,545 (“June 19, 2001 Order”). The price in the
    27
    CalPX spot market was determined by evaluating bids submitted by market
    participants. As we described the procedure in Public Utility Dist. No. 1 of
    Snohomish County v. Dynegy Power Marketing, Inc. (“Dynegy”), 
    384 F.3d 756
    ,
    759 (9th Cir. 2004):
    A seller could submit a series of bids that consisted of price-quantity
    pairs representing offers to sell (e.g. 5 units at $50 each, but 10 units if
    the price is $100 each). Similarly, a buyer could submit a series of
    bids that consisted of price-quantity pairs representing offers to buy.
    The PX would then establish aggregate supply and demand curves and
    set the “market clearing price” at the intersection of the two curves.
    Once the market clearing price had been established, “every exchange would take
    place at the market clearing price, even though some buyers had been willing to pay
    more and some sellers had been willing to sell for less.” 
    Id.
    The CalPX spot market, or “core market” as it is sometimes called, consisted
    of: (1) “day-ahead” trading, in which the market clearing price was derived from the
    sellers’ and buyers’ price and quantity determinations for the next day’s energy
    transactions and (2) “day of” or “hour-ahead” trading, in which CalPX would
    determine on an hourly basis, a single market clearing price which all suppliers
    would be paid. Purchases made in the CalPX spot market were deemed by CPUC to
    be “prudent per se.” See CPUC Decision 95-12-063, 
    1995 WL 792086
     at *26-*27.
    28
    In practice, the CalPX spot market generated considerable price uncertainty.
    Therefore, CalPX started a division, termed CalPX Trading Services (“CTS”), to
    operate a block forward market by matching supply and demand bids for long term
    electricity markets. In 1999, CalPX allowed the investor-owned utilities to purchase
    only a limited percentage of their combined load in the CTS forward market. They
    were required to purchase the balance of their load in the CalPX spot market.
    AB 1890 created another nonprofit entity, the Independent System Operator
    (“Cal-ISO”), also subject to FERC jurisdiction, which was to be responsible for
    managing California’s electricity transmission grid and balancing electrical supply
    and demand. Although the investor-owned utilities continued to own the
    transmission facilities, Cal-ISO exercised operational control over the grid. The
    Cal-ISO grid included the transmission systems of PG&E, Edison, SDG&E, and the
    cities of Vernon, Anaheim, Banning, and Riverside, California. To maintain the
    grid, Cal-ISO was authorized to procure both energy needed to balance the grid
    (“imbalance energy”) and operating reserves (sometimes referred to as “ancillary
    services”). The imbalance energy market is the so-called “real time” market, in
    which bids to supply energy were to be made no later than 45 minutes prior to the
    operating hour. Cal-ISO would rank the supply bids and purchase the required
    energy at the market-clearing price. Cal-ISO would then bill CalPX for electricity it
    29
    required. CalPX would, in turn, bill the investor-owned utilities, who were forced
    to pay whatever price that Cal-ISO paid its suppliers, even though that price might
    have exceeded what the utilities could have charged their consumers as a
    consequence of the retail price freeze.
    Because Cal-ISO was responsible for ensuring that all electricity demand was
    met, Cal-ISO was required to buy energy outside the CalPX market to make up the
    energy shortfall if sellers in the CalPX market were unable or unwilling to provide
    enough supply to meet California’s demand during a particular period. Cal-ISO
    acquired operating reserves, constituting capacity that could be converted to energy
    and delivered to the grid in response to unexpected events, such as power outages,
    from ancillary services suppliers who would agree to reserve capacity during the
    specified period. The ancillary suppliers would agree to supply the required
    electricity during the specified period on demand from Cal-ISO, and were to be paid
    regardless of whether their capacity was used. All of these operations were to be
    governed by a tariff and protocols filed with FERC.
    As we now know, something happened on the way to the trading forum, and
    the best laid regulatory plans went astray. The plan to establish a competitive
    market, while keeping the exercise of monopoly and monopsony power in check,
    failed to account for energy economics and the sophistication of modern energy
    30
    trading. As became clear in hindsight, even those who controlled a relatively small
    percentage of the market had sufficient market power to skew markets artificially.
    In short, the old assumptions, based on antitrust theory, that market power could not
    be exercised by those who possessed less than 20% of the market share proved
    inaccurate in California’s energy market.
    With the new structure, over 80% of the transactions were being made in the
    spot markets – the converse of most other electricity markets, in which more than
    80% of transactions are made through long term forward contracts, lending stability
    to the markets. Sellers quickly learned that the California spot markets could be
    manipulated by withholding power from the market to create scarcity and then
    demanding extremely high prices when scarcity was probable. The energy market is
    highly dependent upon weather; heat waves or cold snaps inevitably produce
    demand. Thus, it was quickly apparent to sellers that there was little risk and great
    profit in withholding capacity when high demand was anticipated based on weather
    forecasts. In addition, traders soon developed other purely artificial means of
    market manipulation, such as shutting down power plants when electric demand was
    high in order to destabilize the electric grid, and to increase prices. In order to
    maximize profit, traders engaged in anomalous bidding practices, including
    “hockey-stick bidding,” in which an extremely high price is demanded for a small
    31
    portion of the market, and “round trip trades,” in which an entity artificially creates
    the appearance of increased revenue and demand through continuous sales and
    purchases.
    Enron Corporation allegedly gamed the California markets with impunity,
    using manipulative corporate strategies, such as those nicknamed “FatBoy,” “Get
    Shorty,” and “Death Star.” Under the “Death Star” strategy, Enron allegedly sought
    to be paid for moving energy to relieve congestion without actually moving any
    energy or relieving any congestion. All of the demand was created artificially and
    fraudulently, creating the appearance of congestion, and then satisfied artificially,
    without the company providing any energy. “FatBoy” refers to a strategy through
    which Enron allegedly withheld previously agreed-to deliveries of power to the
    forward market so that it could sell the energy at a higher price on the spot market.
    The company would over-schedule its load; supply only enough power to cover the
    inflated schedule, and thus, leave extra supply in the market, for which Cal-ISO
    would pay the company. Via the “Get Shorty” strategy, traders were able to
    fabricate and sell operating reserves to Cal-ISO, receive payment, then cancel the
    schedules and cover their commitments by purchasing through a cheaper market
    closer to the time of delivery.
    32
    The California Parties allege that Enron was not alone and that other entities
    engaged in fraudulent power scheduling to serve false load schedules and adopted
    other manipulative strategies.
    Beginning in May 2000, energy prices in California began to escalate
    dramatically. Low cost hydroelectric power from the Northwest was not available
    in the volume of previous years, and wholesale electricity prices skyrocketed,
    particularly in the CalPX spot markets. In May 2000, the average prices in the
    CalPX spot market were double those of May 1999.
    On June 14, 2000, energy consumers in Northern California experienced
    their first wave of rolling blackouts. The California Parties allege that this occurred
    because of market manipulation. They claim that the data indicates that the large
    California generators utilized economic or physical withholding strategies 94% of
    the time during the May through November 2000 period.
    Under its operating procedures, Cal-ISO would declare a “System
    Emergency” when its operating reserves dipped below a predetermined percentage
    of its projected demand. Whenever reserves in California fell below seven percent,
    the ISO declared a “Stage 1 System Emergency.” June 19, 2001 Order, 
    95 FERC ¶ 61,418
     at 62,546. The hours during which Cal-ISO declared a system-wide
    emergency are also called “reserve deficiency hours.” San Diego Elec. Co., et. al.,
    33
    
    97 FERC ¶ 61,275
     at 62,246 (2001) (“December 19, 2001 Order”). During the
    summer of 2000, high temperatures and lack of supply forced the Cal-ISO to
    declare system emergencies 39 times. See San Diego Elec. Co., et. al., 
    93 FERC ¶ 61,121
     at 61,353 (2000).
    In addition to blackouts, brownouts,6 and system emergencies, the crisis
    proved enormously expensive to purchasers of retail power, who were unable to
    pass along the increased cost to their consumers. In June 2000, California spent
    more on purchasing energy than in the entire summer of 1999. This increase
    occurred despite the fact that peak demand was lower in 2000 than in 1999. The
    California investor-owned utilities, who were still subject to the price freeze that
    was supposed to lock in their profits, lost billions of dollars. Cooler weather in the
    fall did not cool prices. Prices continued to escalate throughout the last quarter of
    2000.
    In August 2000, SDG&E filed a complaint under § 206 of the Federal Power
    Act, 16 U.S.C. § 824e(a), against all sellers of energy and ancillary services in the
    CalPX and Cal-ISO markets. SDG&E requested that FERC impose a price cap on
    6
    A brownout occurs when power is not lost completely, but is provided at
    reduced voltage levels.
    34
    sales into those markets. Other parties, including PG&E and the State of California,
    joined the complaint.
    On August 23, 2000, FERC issued an order denying the relief requested by
    SDG&E, but determining that it was appropriate to investigate the justness and
    reasonableness of the rates for all sales in the CalPX and Cal-ISO markets. San
    Diego Gas & Elec. Co., et. al., 
    92 FERC ¶ 61,172
    (2000) (“August 23, 2000 Order”).
    Therefore, it established its own investigatory proceeding in FERC Docket Nos. EL-
    00-95 and EL00-98 (“the Remedy Proceedings”). The August 23, 2000 Order
    established October 29, 2000 as the refund effective date, which was determined by
    calculating the date sixty days after publication of notice of the order in the Federal
    Register. 
    Id. at 61,608
    .
    On November 1, 2000, FERC issued an order proposing structural changes to
    the operation of the CalPX and Cal-ISO markets. San Diego Gas & Elec. Co., et.
    al., 
    93 FERC ¶ 61,121
     (2000) (“November 1, 2000 Order”). In the November 1,
    2000 Order, FERC concluded that:
    [T]he electric market structure and market rules for wholesale sales of
    electric energy in California are seriously flawed and . . . these
    structures and rules, in conjunction with an imbalance of supply and
    demand in California, have caused, and continue to have the potential
    to cause, unjust and unreasonable rates for short-term energy (Day-
    Ahead, Day-of, Ancillary Services and real-time energy sales) under
    certain conditions.
    35
    
    Id. at 61,349
    .
    FERC concluded that there was “clear evidence” that sellers could “exercise
    market power when supply is tight” and produce “unjust and unreasonable rates” for
    wholesale power sales. 
    Id. at 61,349-50
    .
    The November 1, 2000 Order proposed, effective sixty days after the date of
    the order, to (1) eliminate the requirement that the investor-owned utilities buy and
    sell power exclusively through the CalPX; (2) require market participants to
    schedule 95 percent of their transactions in the day-ahead market or be subject to a
    penalty charge; (3) replace the existing CalPX and Cal-ISO stakeholder boards with
    independent non-stakeholder boards; and (4) require the filing of generator
    interconnection procedures.
    In addition to ordering structural and rule changes, FERC ordered an
    evidentiary hearing to determine the appropriate refund. At the behest of the
    California Parties, FERC changed the refund effective date from October 29, 2000
    to October 2, 2000, based on the filing of the SDG&E complaint. FERC also
    limited the refund to Cal-ISO and CalPX spot market transactions completed during
    the period from October 2, 2000 through June 20, 2001 (hereinafter referred to as
    the “Refund Period”).
    36
    Emergency conditions continued following the issuance of the November 1,
    2000 Order, requiring Cal-ISO to serve increasingly larger portions of its load
    through the real time imbalance energy market and depleting Cal-ISO’s operating
    reserves. As a result, Cal-ISO proposed changes to its tariff, which FERC approved
    in an order dated December 8, 2000. Cal. Indep. Operator Corp., et. al., 
    93 FERC ¶ 61,239
     (2000). One provision of this order lifted the Cal-ISO price caps, with the
    goal of attracting more supply into the auction markets.
    On December 15, 2000, FERC issued an order substantially adopting the
    remedies proposed in the November 1, 2000 Order. San Diego Gas & Elec. Co., et.
    al., 
    93 FERC ¶ 61,294
     (2000) (“December 15, 2000 Order”). The December 15,
    2000 Order attempted to reduce the reliance on spot markets by terminating
    CalPX’s wholesale rate schedules, thereby eliminating the requirement that the
    investor-owned utilities buy and sell all generation through CalPX. CalPX sought a
    writ of mandamus from our Court challenging the December 15, 2000 Order’s
    prohibition of the investor-owned utilities’ selling power on a voluntary basis in the
    CalPX market and the termination of the wholesale tariff. The City of San Diego
    also challenged the December 15, 2000 Order by writ of mandate, arguing that
    FERC had unreasonably delayed taking action on the purchasers’ requests for
    37
    refunds. We denied those petitions on April 11, 2001. In re Cal. Power Exch.
    Corp., 
    245 F.3d 1110
     (9th Cir. 2001).
    On December 26, 2000, Edison filed a suit against FERC, alleging that it had
    failed in its responsibility to ensure that wholesale electricity was sold at reasonable
    rates.
    The CalPX market began to collapse and the investor-owned utilities were
    fast becoming insolvent. On January 17, 2001, the Governor of California declared
    a State of Emergency and ordered the California Department of Water Resources to
    purchase energy on behalf of California consumers to halt the rolling blackouts.
    Subsequently, the California legislature on February 1, 2001 enacted Assembly Bill
    1 of the 2001-2002 First Extraordinary Session authorizing the Department of Water
    Resources to purchase power until December 31, 2002. 
    Cal. Water Code § 80000
    ,
    et. seq.
    Following the Governor’s declaration, CERS began buying power on January
    18, 2001. Energy sellers began refusing to sell to Cal-ISO, and instead sold directly
    to the investor-owned utilities and CERS through bilateral contracts. Most sales
    after January 18, 2001 were made directly to CERS, rather than through CalPX or
    Cal-ISO. CalPX ceased market operations on January 30, 2001 and filed for
    protection under Chapter 11 of the Bankruptcy Code on March 9, 2001. The
    38
    California Parties allege that from January 18, 2001 to June 18, 2001, CERS
    purchased more than $5 billion of energy in the spot market.
    On March 1, 2001, the California Electricity Oversight Board (“Cal-EOB”)
    filed a motion with FERC, asking FERC to clarify that the Remedy Proceedings
    included CERS transactions outside of the CalPX and Cal-ISO markets. The Cal-
    EOB contended that the sellers that had manipulated the markets were now charging
    the same or higher rates for the CERS sales.
    On March 9, FERC issued an order establishing a provisional formula
    governing refunds during the January 2001 period. San Diego Gas & Elec. Co., et.
    al., 
    94 FERC ¶ 61,245
     (2000) (“March 9, 2001 Order”). The order directed
    wholesale sellers to provide refunds or, alternatively, to justify their charges and
    costs for transactions made during power emergencies that were above a rate it
    calculated as appropriate. FERC estimated that approximately $69 million in
    January 2001 electricity sales would be subject to refunds.
    On April 6, 2001, PG&E filed a voluntary petition in bankruptcy pursuant to
    Chapter 11 of the Bankruptcy Code. Although Edison and SDG&E were in similar
    financial peril, they avoided bankruptcy filings through arrangements with creditors.
    39
    On April 26, 2001, FERC issued an order establishing a prospective
    mitigation and monitoring plan for wholesale prices through the real time markets
    operated by Cal-ISO. San Diego Gas & Elec. Co., et. al., 
    95 FERC ¶ 61,115
     (2001)
    (“April 26, 2001 Order”). The April 26, 2001 Order established a pricing
    mechanism for sales by California generators made to Cal-ISO when reserves fell
    below seven percent. The order also established conditions, including refund
    liability, for market-based rate authority with the goal of preventing anti-
    competitive bidding behavior in the real time Cal-ISO market.
    On June 19, 2001, FERC issued an order reaffirming that “as a result of the
    seriously flawed electric market structure and rules for wholesale sales of electric
    energy in California, unjust and unreasonable rates were charged, and could
    continue to be charged during certain times and under certain conditions, unless
    certain targeted remedies were implemented.” June 19, 2001 Order, 95 FERC at ¶
    62557.
    The June 19, 2001 Order imposed price caps on all spot market sales from
    June 20, 2001 through September 30, 2002, and imposed a “must-offer” obligation
    on generators to prevent them from withholding supply. The prospective price
    mitigation plan applied to all sellers that voluntarily sold power into the Cal-ISO
    and other designated spot markets, or that voluntarily used Cal-ISO’s or other
    40
    interstate transmission facilities subject to FERC jurisdiction. According to the
    California Parties, the effect of the June 19 Order was to put an end to the rolling
    blackouts, catastrophically high prices, and near-continuous power emergencies.
    On July 12, 2001, the Administrative Law Judge (“ALJ”) issued a report and
    recommendation to FERC regarding a refund methodology to govern sales during
    the Refund Period. San Diego Gas & Elec. Co., et. al., 
    96 FERC ¶ 63,007
     (2001).
    In response to the report and recommendation, FERC issued an order on July 25,
    2001 in the Refund Proceedings establishing the framework for refunds of past sales
    in the spot markets operated by CalPX and Cal-ISO. San Diego Gas & Elec. Co. et.
    al., 
    96 FERC ¶ 61,120
     (2001) (“July 25, 2001 Order”). FERC ordered limited
    refunds for the rates it had determined to be unjust and unreasonable and established
    a mitigated market clearing price (“MMCP”) in an attempt to replicate what it
    believed to be the just and reasonable rates that an unmanipulated competitive
    energy market would have produced. Under the MMCP methodology, refunds were
    to be determined by the difference between the market clearing price, which was the
    price charged by all electricity suppliers at a given time, and the MMCP calculated
    for each hour of the Refund Period, subject to certain adjustments. FERC also
    ordered an evidentiary hearing to calculate the appropriate MMCPs for each hour of
    the Refund Period and the amount of refunds owed.
    41
    However, FERC declined to order refund relief for sales that occurred before
    the Refund Period, or for any sales outside of the CalPX and Cal-ISO markets.
    FERC also excluded transactions of more than twenty-four hours in length, even if
    those sales were made in the CalPX and Cal-ISO markets within the Refund Period.
    The California Parties contend that refunds for sales prior to the Refund Period
    would total $2.3 billion in seller overcharges; that refunds for emergency purchases
    made by CERS would total $3.5 billion in seller overcharges; and that other
    improperly excluded transactions would amount to over $200 million in seller
    overcharges.
    On December 2, 2001, Enron Corporation filed a voluntary petition in
    bankruptcy under Chapter 11 of the United States Bankruptcy Code.
    On December 19, 2001, FERC issued another order addressing mitigation of
    the California spot market prices and conditions. December 19, 2001 Order, 
    97 FERC ¶ 61,275
    , et. seq. The order clarified that the price mitigation plans applied
    to all sales into the FERC-regulated spot markets and provided further explanation
    for why FERC chose October 2, 2000 as the refund effective date. FERC issued an
    order denying rehearing of the December 19, 2001 Order on May 15, 2002.
    On February 13, 2002, FERC opened a non-public investigation (“FERC
    Enforcement Proceeding”) pursuant to 18 C.F.R. § 1b.1 et. seq. into seller market
    42
    manipulation of the energy markets in the Western United States. Fact-Finding
    Investigation of Potential Manipulation of Elec. & Natural Gas Prices, 
    98 FERC ¶ 61,165
     at 61,614 (2002). FERC noted that allegations had been made in the Enron
    bankruptcy that Enron had used its market position to distort electric and natural gas
    markets. FERC directed its staff to investigate “whether any entity, including Enron
    Corporation (through its affiliates or subsidiaries), manipulated short-term prices in
    electric energy or natural gas markets in the West or otherwise exercised undue
    influence over wholesale prices in the West, for the period January 1, 2000,
    forward.” 
    Id.
    In June 2002, some of the California Parties moved this Court for permission
    to present additional evidence of market manipulation in the Remedy Proceedings.
    FERC opposed the motion. On August 21, 2002, we directed FERC to allow the
    parties to present evidence of market manipulation in the Remedy Proceedings, to
    reconsider its earlier orders denying relief, and to provide to the Court supplemental
    findings of fact and any recommended modifications to FERC’s orders on the basis
    of such new evidence.
    On March 20, 2002, the State of California, through its Attorney General,
    filed a complaint alleging that generators and marketers selling power into markets
    operated by CalPX and Cal-ISO, as well as those making spot market sales of
    43
    energy to CERS, violated § 205 of the Federal Power Act by failing to comply with
    various filing requirements. The complaint also challenged FERC’s approval of
    market-based tariffs. On May 31, 2002, FERC dismissed the complaint as
    constituting a collateral attack on prior FERC orders and denied the complaint with
    respect to the allegations that FERC’s market-based rate filing requirements
    violated the Federal Power Act as a matter of law. State of California ex. rel.
    Lockyer v. B. C. Power Exch., et. al., 
    99 FERC ¶ 61,247
     (2002) (“May 31, 2002
    Order”). California filed a petition for review of the May 31, 2002 Order.
    In December 2002, the ALJ determined that suppliers owed approximately
    $1.8 billion to Cal-ISO and CalPX for sales at rates in excess of a just and
    reasonable rate. San Diego Gas & Elec. Co., et. al., 
    101 FERC ¶ 63,026
     (2002).
    FERC adopted in part, and modified in part, the ALJ’s proposed findings in an order
    issued March 26, 2003 Order, 2003. San Diego Gas & Elec. Co., et. al., 
    102 FERC ¶ 61,317
     (2003) (“March 26, 2003 Order”).
    In its March 26, 2003 Order, FERC stated that it would not alter any of its
    previous orders in the Remedy Proceedings concerning the time or transaction
    limitations in light of the evidence presented to the ALJ. This position was
    reaffirmed in subsequent FERC orders on October 16, 2003, which also clarified
    some refund calculation issues. San Diego Gas & Elec. Co., et. al., 
    105 FERC ¶ 44
    61,066 (2003); San Diego Gas & Elec. Co., et. al., 
    105 FERC ¶ 61,065
     (2003).
    Subsequently, FERC issued a number of orders pertaining to calculation of refunds
    during the Refund Period. San Diego Gas & Elec. Co., et. al., 
    107 FERC ¶ 61,165
    (2004); San Diego Gas & Elec. Co., et. al. 
    107 FERC ¶ 61,166
     (2004); San Diego
    Gas & Elec. Co., et. al., 
    108 FERC ¶ 61,311
     (2004), and San Diego Gas & Elec.
    Co., et. al., 
    109 FERC ¶ 61,219
     (2004), order on reh’g, 
    109 FERC ¶ 61,074
     (2004).
    On September 9, 2004, we granted in part California’s petition for review
    challenging the May 31, 2002 Order. State of California ex. rel. Lockyer v. FERC,
    
    383 F.3d 1006
     (9th Cir. 2004) (“Lockyer”). We held that FERC’s decision to
    approve market-based tariffs in the wholesale electricity market did not violate the
    Federal Power Act. 
    Id. at 1013
    . We also held that FERC erred as a matter of law in
    concluding retroactive refunds were not available under § 205. Id. at 1015. We
    remanded the case to FERC for further proceedings.
    Before us in the instant case are those portions of the petitions for review that
    involve the Scope/Transaction issues. We review FERC orders to determine
    whether they are “arbitrary, capricious, an abuse of discretion, unsupported by
    substantial evidence, or not in accordance with law.” Cal. Dep’t of Water Res. v.
    FERC, 
    341 F.3d 906
    , 910 (9th Cir. 2003). FERC’s factual findings are conclusive if
    supported by substantial evidence. 16 U.S.C. § 825l(b); Bear Lake Watch, Inc. v.
    45
    FERC, 
    324 F.3d 1071
    , 1076 (9th Cir. 2003). Substantial evidence “means such
    relevant evidence as a reasonable mind might accept as adequate to support a
    conclusion.” 
    Id.
     (quoting Eichler v. SEC, 
    757 F.2d 1066
    , 1069 (9th Cir. 1985)). “If
    the evidence is susceptible of more than one rational interpretation, we must uphold
    [FERC’s] findings.” 
    Id.
     We review questions of law de novo. Am. Rivers v. FERC,
    
    201 F.3d 1186
    , 1194 (9th Cir. 1999). We review FERC’s interpretation of the FPA
    under the familiar analysis established in Chevron U.S.A., Inc. v. Natural Res. Def.
    Council, 
    467 U.S. 837
    , 842 (1984) and its progeny. Bonneville Power Admin., 
    422 F.3d at 914
    .
    III
    Temporal Scope of Refunds
    Under § 206(a) of the Federal Power Act, FERC may investigate whether a
    particular rate or charge is “just and reasonable.” 16 U.S.C. § 824d(a). If FERC
    finds a rate unreasonable, it must order the imposition of a just and reasonable rate.
    Id. § 824d(d). FERC may then order refunds for any period subsequent to the
    “refund effective date,” a date FERC establishes that must be at least sixty days after
    the filing of the complaint. Id. § 824e(b). Under the express language of § 206,
    however, FERC may not order refunds for any period prior to the filing of the
    complaint. Id. Section 309 of the Federal Power Act, on the other hand, gives
    46
    FERC authority to order refunds if it finds violations of the filed tariff and imposes
    no temporal limitations. Consol. Edison v. FERC, 
    347 F.3d 964
    , 967 (D.C. Cir.
    2003); 16 U.S.C. § 825h.
    In its August 23, 2000 Order, FERC established October 29, 2000 as the
    refund effective date pursuant to § 206. In its November 1, 2000 Order, FERC
    modified the refund effective date to October 2, 2000. The Competitive Suppliers
    Group argues that October 29, 2000 was the proper refund effective date. The
    California Parties do not dispute FERC’s establishment of October 2, 2000 as the
    refund effective date for the § 206 proceedings, but argue that FERC arbitrarily and
    capriciously refused to order refunds for tariff violations under § 309 for periods
    prior to October 2, 2000.
    A
    We conclude that FERC’s order establishing October 2, 2000 as the refund
    effective date for the § 206 Refund Proceedings was not arbitrary or capricious, an
    abuse of discretion, unsupported by substantial evidence, or not in accordance with
    law.
    SDG&E filed its initial § 206 complaint on August 2, 2000. In its response to
    SDG&E’s filing, FERC, in its August 23, 2000 Order, announced that it would
    47
    commence its own investigation and set the refund effective date sixty days after
    FERC published an announcement of the investigation. The notice was published
    August 29, 2000; therefore, the refund effective date was set as October 29, 2000.
    On September 22, 2000, some of the California Parties, notably PG&E and
    Edison, requested that FERC establish an earlier refund date based on the filing of
    the SDG&E complaint, rather than on FERC’s commencement of the Enforcement
    Proceedings. Given SDG&E’s August 2, 2000 filing date, the earliest possible
    refund effective date was October 2, 2000. In the November 1, 2000 Order, FERC
    granted the request and reset the refund effective date to October 2, 2000.
    Thus, the question at issue here is whether FERC properly tethered the refund
    effective date to the SDG&E complaint. Although FERC denied the remedy sought
    by SDG&E in its complaint, it did not dismiss the SDG&E complaint; rather, it
    consolidated the SDG&E complaint with its own investigation “for purposes of
    hearing and decision in view of their common issues of law and fact.” December
    19, 2001 Order, 
    97 FERC ¶ 61,275
     at 62,198. Despite consolidation, FERC made it
    clear that the August 23, 2000 Order “established two separate, but related,
    investigations.” 
    Id. at 62,197
    . According to FERC, the investigation into the
    “justness and reasonableness of sellers’ rates in the ISO and PX markets” that
    resulted in the refund order grew out of SDG&E’s complaint. 
    Id.
    48
    In addition, FERC noted that its policy “is to establish the earliest refund
    effective date allowed in order to give maximum protection to consumers.” 
    Id. at 62,198
    . This interpretation is consistent with FERC’s “primary purpose” in
    “protecting consumers.” Lockyer, 
    383 F.3d at 1017
    .
    The Competitive Suppliers Group argues that the SDG&E complaint cannot
    form the basis for establishing the refund effective date because SDG&E did not
    seek refunds pursuant to § 206 in its complaint, and third-party FERC complaints
    must specify relief sought. To be sure, § 206(a) requires third-party complaints to
    FERC to “state the change or changes to be made in the rate, charge, classification,
    rule, regulation, practice, or contract then in force. . . .” 16 U.S.C. § 824e(a). It is
    also quite true that SDG&E did not seek a refund remedy in its initial complaint.
    SDG&E’s complaint sought an emergency order capping prices in the CalPX and
    Cal-ISO markets and a ruling enforcing the cap through limitations on market-based
    authorizations.
    However, the relief sought in the initial complaint is not dispositive of this
    issue. The key question is whether the SDG&E complaint afforded sufficient notice
    to alert market participants that sales and purchases might be subject to refund. The
    gravamen of the SDG&E complaint was that the rates charged by sellers were unjust
    and unreasonable. As FERC points out, a complaint challenging the reasonableness
    49
    of the rates can lead to a refund under § 206, even if a refund remedy is not
    specifically designated in the initial complaint. FERC is empowered to investigate
    the reasonableness of a rate either in the context of a third-party complaint or sua
    sponte. Indeed, as we have noted, the Federal Power Act requires FERC to
    establish a refund effective date whenever it institutes a § 206 investigation. 16
    U.S.C. § 824e(b).
    Further, some of the California Parties promptly sought rehearing of FERC’s
    initial determination of the refund effective date in its August 23, 2000 Order. In
    short, market participants were quickly apprised that the original refund effective
    date might be subject to revision. As FERC noted: “Requests for rehearing of the
    August 23 Order raising the refund effective date issue were timely filed. Thus, any
    reliance by sellers on the October 29 refund effective date prior to the issuance of a
    final order was at their own risk.” December 19, 2001 Order, 
    97 FERC ¶ 61,275
     at
    62,198. Therefore, because SDG&E’s § 206 complaint unquestionably could have
    led to a FERC refund order, because the original FERC order establishing the
    refund effective date was not final, and because rehearing petitions were timely filed
    challenging the refund effective date, SDG&E’s filing of its complaint provided
    sufficient notice to the market to satisfy § 206.
    50
    The fact that two investigations were initiated by FERC does not alter this
    conclusion. The investigation initiated by SDG&E’s complaint focused on whether
    the sellers’ rates in the CalPX and Cal-ISO markets were just and reasonable; the
    separate FERC investigation focused on whether the CalPX and Cal-ISO market
    rules and institutional factors required modification. As FERC noted in its August
    23, 2000 Order:
    While the SDG&E has focused on the performance of sellers in the
    market, the action of sellers may in part be caused by the current
    market rules and institutional structures. Accordingly, we conclude
    that it is appropriate to investigate not only the justness and
    reasonableness of public utility sellers’ rates in the PX and ISO
    markets, but also to investigate the tariffs and agreements of the ISO
    and PX to determine whether market rules or institutional factors
    embodied in those tariffs and agreements need to be modified.
    
    92 FERC ¶ 61,172
     at 61,606.
    In short, FERC launched a § 206 investigation into the justness and
    reasonableness of the rates pursuant to the SDG&E complaint and initiated its own
    investigation into the CalPX and Cal-ISO tariffs and agreements to determine
    whether market rules required modification. The Competitive Suppliers Group
    argues that the § 206 investigation became subsumed into the market investigation.
    However, this contention contradicts the plain language employed by FERC when it
    established the two investigations and the subsequent treatment of the investigations
    51
    in later FERC orders. No substantive consolidation was ever ordered. Even if the
    cases had been substantively consolidated, consolidation would not necessarily
    eviscerate a validly established refund effective date based on the original SDG&E
    complaint. Refunds were eventually ordered as a direct result of the SDG&E
    complaint. Given all these considerations, we conclude that FERC did not act
    arbitrarily or capriciously, abuse its discretion, or act in violation of law in setting
    the refund effective date based on the SDG&E complaint.
    B
    FERC’s authority to order refunds for filed rates that are later determined to
    be unjust, unreasonable, or discriminatory derives from §§ 205 and 206 of the
    Federal Power Act. FERC also has remedial authority to require that entities
    violating the Federal Power Act pay restitution for profits gained as a result of a
    statutory or tariff violation. Consol. Edison, 
    347 F.3d at 967
    ; Towns of Concord,
    Norwood & Wellesley v. FERC, 
    955 F.2d 67
     (D.C. Cir. 1992), S. Cal. Edison Co. v.
    FERC, 
    805 F.2d 1068
    , 1071-72 (D.C. Cir. 1986). This authority derives from § 309
    of the Federal Power Act, which authorizes FERC “to perform any and all acts, and
    to prescribe, issue, make, amend, and rescind such orders, rules, and regulations as
    it may find necessary or appropriate to carry out the provisions of this Act.” 16
    52
    U.S.C. § 825h. Unlike refund proceedings commenced under § 206, no time limits
    apply to remedial actions filed pursuant to § 309.
    In its July 25, 2001 Order, FERC declined to award any relief pursuant to §
    309. The California Parties sought review of that decision. We granted the
    California Parties’ motion for an order requiring FERC to entertain further evidence
    of market manipulation and tariff violation and to reconsider its orders limiting
    remedies. After receiving further evidence, FERC ruled that it would not consider
    further remedies. March 26, 2003 Order, 
    102 FERC ¶ 61,317
     at 62,083. The
    California Parties petition for review of FERC’s refusal to consider § 309 remedies.
    We conclude that FERC’s decision not to consider a § 309 remedy for tariff
    violations was arbitrary and capricious, an abuse of discretion, and not in
    accordance with law. On appellate review, FERC “must be able to demonstrate that
    it has made a reasoned decision based upon substantial evidence in the record.” N.
    States Power Co. v. FERC, 
    30 F.3d 177
    , 180 (D.C. Cir. 1994) (internal quotations
    omitted). FERC must “articulate a satisfactory explanation for its action including a
    rational connection between the facts found and the choice made.” Motor Vehicle
    Mfrs. Assn of the U. S., Inc. v. State Farm Mut. Ins. Co., 
    463 U.S. 29
    , 43 (1983).
    53
    In this case, FERC offers several rationales for refusing to grant tariff relief.
    First, it claims that § 206 precludes refunds prior to the refund effective date.
    Second, it contends that no tariff violations occurred. Third, it argues that it need
    not provide remedies to the California Parties because it has commenced
    prosecutorial investigations into the question of whether tariff violations occurred,
    and those investigations may result in remedies which would make the market
    whole. None of these justifications is sufficient to sustain FERC’s decision under
    the applicable standard of review.
    First, FERC’s claim that it is precluded from ordering pre-Refund Period
    relief under § 206 may be quickly dispatched. The relief sought by the California
    Parties in this part of the proceeding is based on § 309, not § 206. Although the §
    206 proceedings seeking refunds because of unjust and unreasonable rates are
    limited to the Refund Period, § 309 proceedings based on tariff violations are not.
    FERC’s apparent conclusion that the time limits applicable to § 206 proceedings
    also apply to § 309 proceeding is incorrect as a matter of law. Indeed, FERC
    emphasized as much in its own filings in the investigatory proceedings:
    Thus, with respect to the period prior to the October 2, 2000 refund
    effective date, the Commission can order disgorgement of monies
    above the post October 2, 2000 refunds ordered in the California
    Refund Proceeding, if it finds violations of the ISO and PX tariffs and
    finds that a monetary remedy is appropriate for such violations.
    54
    Further, while refund protection has been in effect for sales in the ISO
    and PX short-term energy markets since October 2, 2000, the
    Commission can additionally order additional disgorgement of unjust
    profits for tariff violations that occurred after October 2, 2000 (i.e., to
    June 20, 2001).
    Enron Power Mktg, Inc., 
    103 FERC ¶ 61,346
     at 62,351 (2003).To the extent that
    FERC is claiming that the § 206 time limits apply to § 309 proceedings, FERC is
    wrong.
    Second, FERC alleges there were no tariff violations, contending that “there
    is no basis for finding that the sellers acted inconsistently with Commission-filed
    tariffs or with specific requirements in their filed rate authorizations.” July 25, 2001
    Order, 96 FERC at 61,508. This conclusion is flatly inconsistent with FERC’s
    commencement of the FERC Enforcement Proceeding, which was initiated to
    investigate and prosecute tariff violations. It contradicts the conclusion of FERC
    staff, accepted by FERC, that bid prices in the pre-Refund Period were “excessively
    elevated solely for the purpose of raising prices” in violation of the Cal-ISO and
    CalPX rules. Investigation of Anomalous Bidding Behavior and Practices in the
    Western Markets, 
    103 FERC ¶ 61,347
     at 62,360 (2003). FERC concluded that “the
    remedy for these tariff violations, if found to exist, would be the disgorgement of
    any unjust profits attributable to these tariff violations.” 
    Id. at 62,359
    .
    55
    FERC’s assertion in this proceeding that there were no tariff violations prior
    to the Refund Period is contravened by its own findings in American Electric Power
    Services Corp., to wit:
    As discussed below, the entities listed in the caption (Identified
    Entities) appear to have participated in activities (Gaming Practices),
    that constitute gaming and/or anomalous market behavior in violation
    of the California Independent System Operator Corporation’s (ISO)
    and California Power Exchange’s (PX) tariffs during the period
    January 1, 2000 to June 20, 2001, that warrant a monetary remedy of
    disgorgement of unjust profits and that may warrant other additional,
    appropriate non-monetary remedies. These determinations are based on
    certain of the tariffs’ provisions, an ISO study, a report by Commission
    Staff, and evidence and comments submitted by market participants.
    
    103 FERC ¶ 61,345
     at 62,328 (2003). See also Enron Power Mktg, Inc., 
    103 FERC ¶ 61,346
    .
    In addition to FERC’s own conclusions, the California Parties also presented
    significant evidence of pervasive tariff violations during the pre-Refund Period. In
    sum, there is no support for FERC’s second rationale for denying the California
    Parties’ request for pre-Refund Period relief.
    FERC’s third stated reason for denying the request is that it is pursuing tariff
    violations in the separate FERC Enforcement Proceeding. Obviously, this rationale
    contradict’s FERC’s second rationale – that no tariff violations exist. This reason
    for rejecting the California Parties’ request for § 309 relief is also unsupportable.
    56
    In explaining its third reason for denying the request, FERC describes at
    length its broad investigatory and prosecutorial authority under § 307(a) (
    16 U.S.C. § 825
    (f)) and § 309 (16 U.S.C. § 825h). However, no one disputes this authority.
    What FERC fails to explain, or support, is how its inherent authority to commence
    investigations and enforcement proceedings under 18 C.F.R. § 1b.1 et. seq.
    precludes a civil proceeding instituted by third party complaint.
    The two types of proceedings are quite distinct. One is investigative and
    prosecutorial; the other is a contested proceeding. FERC enjoys broad discretion in
    the management of its own § 1b prosecutorial investigations. FERC
    “[i]nvestigations may be formal or preliminary, and public or private.” 18 CFR §
    1b.4. In contrast to an adjudicated, contested proceeding, in a § 1b proceeding,
    FERC may settle claims without review, and need not justify its decision to order
    refunds, or to decline to order refunds.
    Because §1b investigations are prosecutorial in nature, third parties do not
    participate. 18 C.F.R. § 1b.11. For example, in this case FERC denied the
    California Parties’ motion to intervene in the FERC Enforcement Proceeding,
    explaining:
    The Commission intends the proceedings listed in the caption of this
    order to proceed as investigative and, where appropriate, enforcement
    proceedings. Their purpose is to examine instances of potential
    57
    wrongdoing and take remedial action where needed. The Commission
    is thus acting in a prosecutorial manner in these matters, rather than
    strictly as an adjudicator. . . .
    . . . [This] has important implications, particularly with respect to
    potential intervenors. There are no parties to an investigative
    proceeding. 18 C.F.R. § 1b.11 (2003). Moreover, only a party can
    contest a settlement, 
    18 C.F.R. § 385.602
    (h) (2003). . . . Another
    implication of the application is the Commission’s rules governing
    off-the-record communications. These rules apply only to contested,
    on-the-record proceedings; they do not apply to Part 1b investigations
    unless the Commission specifically makes an exception to allow
    formal interventions and party status. 
    18 C.F.R. § 385.2201
    (c) (2003)
    ....
    . . . Consequently, the Commission is treating all pending motions for
    intervention as motions to file comments and, to the extent the
    Commission to date may have erroneously allowed intervention,
    rescinding those interventions that have heretofore been granted.
    Fact-Finding Investigation of Potential Market Manipulation of Elec. & Natural Gas
    Prices, 
    105 FERC ¶ 61,063
     at 61,352(2003)
    Commissioner Massey dissented from this decision, writing:
    I do not agree that the investigation of Anomalous Bidding Behavior
    and Practices in the Western Markets should be treated exclusively as
    an investigation under Part 1b and that there should be no parties to the
    proceeding. Much of the evidence supporting the investigation was
    adduced by parties pursuant to a court order in the California refund
    proceeding. The California parties are integral to the assessment of and
    weight to be given the evidence. The Commission should not decide,
    in isolated enforcement proceedings, issues upon which the court-
    ordered adduced evidence has a bearing where those that adduced the
    evidence are not parties and have no appeal rights.
    58
    
    Id. at 61,353
    .
    At various times, FERC has stated that it reserves the right to impose market-
    wide inquiries in the FERC Enforcement Proceedings; however, in these
    proceedings to date, it has only pursued “company-specific” investigations into the
    actions of various market participants, rather than conducting a market-wide
    inquiry. San Diego Gas & Elec. Co., et. al., 
    105 FERC ¶ 61,066
     at 61,385. FERC
    itself casts its company-specific approach as supplemental to the adjudicative refund
    proceedings undertaken pursuant to § 206. See, e.g., San Diego Gas & Elec. Co., et.
    al., 
    105 FERC ¶ 61,066
     at 61,391 (“Any such company-specific disgorgement or
    other appropriate remedies would be in addition to the refunds associated with the
    mitigated market clearing prices developed pursuant to this order and could apply to
    conduct both prior to the Refund Period and during the Refund Period.”); 
    102 FERC ¶ 61,108
     at 61, 289 (2003) (“The payment to be made by Reliant will be in
    addition to any refund ultimately owed by Reliant as part of the refund proceeding
    in Docket No. EL00-95, et. al.”).
    In contrast, the California Parties seek a market-wide refund remedy for tariff
    violations pursuant to § 309 through its adjudicative filing. The fact that FERC may
    be seeking similar remedies against specific companies in its §1b investigations
    does not justify its denial of the California Parties’ request for § 309 relief. When
    59
    parties seek adjudicative relief from an agency, they are entitled to a reasoned
    response from the agency. Here, the California Parties filed a cognizable request for
    relief and tendered credible evidence in support of their request. A party’s valid
    request for relief cannot be denied purely on the basis that the agency is considering
    its own enforcement action that may impart a portion of the relief sought. If an
    aggrieved party tenders sufficient evidence that tariffs have been violated, then it is
    entitled to have FERC adjudicate whether the tariff has been violated and what
    relief is appropriate.
    In sum, none of the reasons given by FERC for refusing to adjudicate whether
    tariffs were violated is sustainable. Section 309 relief is not limited by § 206.
    FERC’s determination that no tariff violations occurred is not supported by the
    record. FERC cannot avoid adjudicating a third-party petition because it may or
    may not choose to commence a separate enforcement action. For these reasons, we
    conclude that FERC’s categorical rejection of the California Parties’ request for §
    309 relief was arbitrary, capricious, and an abuse of discretion. Therefore, we grant
    the petition for review as it pertains to the California Parties’ challenge to FERC’s
    foreclosure of relief for tariff violations. We deny the California Parties’ petition
    insofar as it calls for us to decide the merits of its request for § 309 relief. We do
    not prejudge how FERC should address the merits or fashion a remedy if
    60
    appropriate. FERC cannot, however, categorically refuse to entertain the
    application; it must address the merits.
    IV
    Out of Market Spot Transactions
    FERC’s July 25, 2001 Order mandated retrospective relief for sales to Cal-
    ISO, including out-of-market (“OOM”) transactions. These purchases were made
    by Cal-ISO from sellers outside the Cal-ISO single price auction market within 24
    hours or less of delivery, and served to stabilize the grid when supply was
    insufficient to meet demand. Because Cal-ISO had no choice but to buy energy to
    ensure grid reliability, potential sellers were in a position to exercise improper
    market leverage by exploiting the structural flaws in the market. FERC concluded
    that the OOM transactions provided the best opportunity for extracting unjust and
    unreasonable rates and therefore, made them subject to potential refunds.
    The Competitive Suppliers Group petitions for review of FERC’s decision to
    include OOM sales into the Cal-ISO because (1) FERC made no express finding
    that the rates charged for OOM sales were unjust and unreasonable and (2) the
    Remedy Proceedings had been limited since their inception to the Cal-ISO/CalPX
    single-price auction market. We deny this petition for review.
    A
    61
    Section 206(a) of the Federal Power Act requires that before FERC can
    exercise its remedial power to mitigate an existing rate, it must find an existing rate
    “unjust, unreasonable, unduly discriminatory or preferential.” 16 U.S.C. § 824e(a);
    Fed. Power Comm’n v. Sierra Pac. Power Co., 
    350 U.S. 348
    , 353 (1956). The
    Competitive Suppliers Group argues that although FERC made a finding that prices
    within the auction markets were unjust and unreasonable, they never made such a
    finding with respect to OOM sales to Cal-ISO.
    In its July 25, 2001 Order, FERC adopted the MMCP to calculate just and
    reasonable rates for Cal-ISO and CalPX. The MMCP was the benchmark for
    determining the amount of refunds that sellers had to pay – FERC simply looked at
    their transactions during the refund period then ordered them to pay the difference
    between the rate and the MMCP.
    Application of the MMCP was a determination that a rate was unjust and
    unreasonable. As FERC explains in its brief,
    [B]ecause the conditions under which [Cal-ISO] OOM spot
    transactions were entered into made it likely that the rates for
    those transactions were unjust and unreasonable, FERC required
    that all transactions be examined to decide which ones would be
    subject to refund. . . . [A] market-wide mitigation methodology
    was needed in the [Cal-ISO] and CalPX auction markets because
    systemic dysfunctions caused by structural problems in those
    markets had the potential to cause unjust and unreasonable rates
    ‘independent of any conclusive showing of a specific abuse of
    62
    power.’ In addition, a showing of market power abuse is not a
    prerequisite for finding rates are outside the zone of
    reasonableness and, therefore, unjust and unreasonable.
    FERC Br., citing July 21, 2001 Order.
    FERC’s analysis of this issue is correct. The Federal Power Act does not
    require the detailed individualized finding that Competitive Suppliers Group
    requests, nor does it require a showing of market power abuses, and no court has
    held that it does.
    FERC found that there was systemic dysfunction in the wholesale energy
    market and that, during the time that Cal-ISO was making OOM purchases, it was
    in an emergency must-buy situation, which gave the sellers even greater market
    power, and thus increased the likelihood that the rates were unjust and
    unreasonable. These facts constituted a sufficient finding that the rates were unjust
    and unreasonable. FERC was not required to make an additional individualized
    finding, in addition to the imposition of the MMCP, that rates for Cal-ISO OOM
    transactions were unjust and unreasonable.
    B
    Contrary to the Competitive Suppliers Group’s argument, the Remedy
    Proceedings were not limited to the Cal-ISO and CalPX single-price auction
    markets. First, nothing in the language of the August 2, 2000 complaint or early
    63
    orders necessarily limited the Remedy Proceedings to the Cal-ISO and CalPX in-
    market transactions. Indeed, the SDG&E complaint was “directed against all
    sellers in the ISO and PX markets.” FERC did not add the Cal-ISO OOM
    transactions to the proceeding. Rather, it clarified in its orders that the transactions
    were encompassed in the scope of the SDG&E complaint proceeding.
    Second, FERC offered a sufficient explanation as to why the Cal-ISO OOM
    transactions were subject to refunds, namely that the purchases, like in-market
    purchases, were made to “procure the resources necessary to reliably operate the
    grid.” July 25, 2001 Order, 
    96 FERC ¶ 61,120
     at 61,515. Therefore, there was no
    meaningful distinction to be drawn between the in- and out-of-market transactions.
    FERC further noted that the Cal-ISO OOM transactions were contemplated in the
    Cal-ISO tariff as a backstop to the Cal-ISO auction market.
    The Competitive Suppliers Group points out that OOM transactions made by
    Cal-ISO are fundamentally different from those made in the Cal-ISO market.
    Certainly, there are significant differences. The OOM transactions at issue here
    were bilaterally negotiated sales of power at different prices than the market
    clearing price established in the auction market. However, as FERC points out,
    these bilateral transactions were closely intertwined with the Cal-ISO single price
    auction spot market because manipulation of the single price auction market could
    64
    create artificial market forces, making it probable that rates charged in the OOM
    transactions were unjust and unreasonable. Although different in form, both the
    single price auction purchases and Cal-ISO OOM purchases occurred in the same
    market, so the structural flaws that allowed unjust and unreasonable prices to be
    charged in the single-price auction also allowed unjust and unreasonable prices to
    be charged in the Cal-ISO OOM transactions. Given this structural relationship, it
    was reasonable for FERC to examine those Cal-ISO OOM transactions that were
    affected by the manipulated market conditions and order refunds when appropriate.
    It is also significant to note that FERC did not order refunds for all Cal-ISO
    OOM transactions. Rather, FERC ordered all Cal-ISO OOM spot transactions to
    be examined to decide which ones would be subject to potential refund. An
    agency’s discretion is at its zenith when it is “fashioning [] policies, remedies and
    sanctions, including enforcement and voluntary compliance programs in order to
    arrive at maximum effectuation of Congressional objectives.” Niagara Mohawk
    Power Corp. v. Fed. Power Comm’n, 
    379 F.2d 153
    , 159 (D.C. Cir. 1967). Given
    this level of deference, coupled with FERC’s reasoned explanation of its decision,
    we conclude that FERC did not act arbitrarily, capriciously, or in abuse of its
    discretion when it included the Cal-ISO OOM transactions in the Remedy
    Proceedings.
    65
    V
    Non-Emergency Hours Transactions
    A
    In its initial mitigation orders, FERC limited price mitigation only to
    “emergency hours” when supply was deficient and suppliers knew that their bids,
    however high, would be accepted. June 19, 2001 Order, 
    95 FERC ¶ 61,418
     at
    62,546-62,547. FERC believed that during hours when there were sufficient
    energy reserves to ensure that the Cal-ISO controlled grid would remain reliable,
    called “non-emergency hours,” suppliers would be motivated to bid competitive
    prices. FERC reasoned that with excess supplies in the market, suppliers would bid
    competitively because they ran the risk that their bids would not be accepted. See
    
    id. at 62,547
    .
    Over time, however, FERC observed that because energy supply was
    generally low, suppliers could count on their bids being accepted in both
    emergency and non-emergency hours. So, the incentive to bid high prices was as
    evident during non-emergency hours as it was during emergency hours. See
    December 19, 2001 Order, 
    97 FERC ¶ 61,275
     at 62,247 (“[D]uring non-emergency
    periods where there were no excess supplies in the market and all suppliers would
    be dispatched, the incentive to bid high prices remained.”). Although FERC’s
    66
    targeted remedies had improved the wholesale power market to some extent, see
    June 19, 2001 Order, 
    95 FERC ¶ 61,418
     at 62,546, the market remained generally
    dysfunctional, 
    id. at ¶ 62,556
    .
    Thus, in an attempt to provide “the incentives needed to correct the
    [remaining] market dysfunctions,” FERC expanded the market monitoring and
    mitigation plan to address all operating hours. 
    Id. at ¶ 62,547
    . FERC
    implemented prospective relief for non-emergency hours by modifying the formula
    it had used to set the market clearing price in emergency hours. 
    Id. at ¶ 62,558
    .
    Recognizing that rates should decrease in non-emergency hours due to an increase
    in supply, FERC set the market clearing price for non-emergency hours at 85
    percent of the market clearing price established during the last system emergency.
    
    Id. at ¶ 62,548
    . FERC would permit a higher bid only if justified by the supplier.
    
    Id. at ¶ 62,558
    . FERC’s intention was to “emulate . . . a competitive market,” and
    “prevent possible abuses that could lead to unjust and unreasonable rates.” 
    Id. at 62,558
    .
    In its July 25, 2001 Order, FERC declined to order refunds because it felt
    that an evidentiary hearing was necessary to resolve “material issues of fact” before
    deciding whether to order a refund. July 25, 2001 Order, 
    96 FERC ¶ 61,120
     at
    67
    61,519-61,520. FERC ordered Cal-ISO to apply the MMCP to each operating hour
    and report the data to an ALJ. 
    Id. at ¶ 61,520
    . FERC then directed the ALJ to
    make findings of fact with respect to: (1) the mitigated price in each
    hour of the refund period; (2) the amount of refunds owed by each
    supplier according to the methodology established herein; and (3) the
    amount currently owed to each supplier (with separate quantities due
    from each entity) by the ISO, the investor owned utilities, and the
    State of California.
    
    Id.
    FERC explained that its decision to review rates in all operating hours was
    based on its original finding of systemic market dysfunction, which “was not
    limited to reserve deficiency periods.” December 19, 2001 Order, 
    97 FERC ¶ 61,275
     at 62,246. Referencing the finding in its November 1, 2000 Order that the
    market was structurally flawed, FERC stated: “We determined that structural
    problems, which existed in all hours, had the potential to cause market prices to
    exceed that which one would expect in a competitive market. While our solution
    requires review for all hours, that does not mean that this will result in refunds for
    all hours.” 
    Id.
    The Competitive Suppliers Group petitions for review of FERC’s decision to
    apply the MMCP to non-emergency operating hours. It argues that FERC’s
    decision to order mitigation for non-emergency hours was arbitrary and capricious
    68
    because FERC did not expressly find that rates during non-emergency hours were
    unjust and unreasonable.
    B
    As we have noted, before FERC can exercise its remedial powers under FPA
    § 206, it must find that the rate at issue is unjust and unreasonable. 16 U.S.C.
    824e(a). The Competitive Suppliers Group attacks the adequacy of FERC’s
    general finding of systemic market dysfunction, arguing that it did not satisfy the
    condition precedent to § 206(a) authority.
    The Competitive Suppliers Group claims that FERC was required to make
    explicit findings that specific rates charged in each operating hour were unjust or
    unreasonable. However, as we have noted, no such requirement exists. FERC
    “may rely on ‘generic’ or ‘general’ findings of a systemic problem to support
    imposition of an industry-wide solution.” Interstate Natural Gas Ass’n of Am. v.
    FERC, 
    285 F.3d 18
    , 37 (D.C. Cir. 2002). “[P]roportionality between the identified
    problem and the remedy is the key.” 
    Id.
    To be sure, if FERC found isolated problems within the wholesale electric
    energy market, its market-wide remedy would have been inappropriate. See Assoc.
    Gas Distribs. v. FERC, 
    824 F.2d 981
    , 1019 (D.C. Cir. 1987) (“Neither Wisconsin
    69
    Gas nor any other case of which we are aware supports an industry-wide solution
    for a problem that exists only in isolated pockets. In such a case, the disproportion
    of remedy to ailment would, at least at some point, become arbitrary and
    capricious.”). However, faced with a market plagued by structural problems and
    operating under “seriously flawed” rules, FERC could have reasonably considered
    a market-wide remedy necessary.
    FERC’s response was proportional to the identified problem: It ordered
    wholesale review of a market that it had identified as wholly dysfunctional.
    Moreover, the method FERC used to review the system resulted in an
    individualized analysis of the rates charged in each operating hour. FERC
    explained that its expansion of mitigation measures over time was a reflection of
    both the “rapidly changing circumstances” during the refund period and its attempt
    to balance competing interests while fulfilling its FPA obligations:
    In response to [its November 1 dysfunctional market] findings, the
    Commission has sought to intervene in markets in as limited a manner
    as possible consistent with its responsibilities to ensure just and
    reasonable rates under the FPA, to rely on market principles whenever
    it can, and to balance carefully the need for price relief against the
    need for price signals to attract critical supply entry.
    December 19, 2001 Order, 
    97 FERC ¶ 61,275
     at 62,246.
    70
    Given all of these considerations, we cannot say that FERC’s decision to
    include non-emergency hours transactions in its market mitigation orders was
    arbitrary, capricious, or an abuse of discretion.
    VI
    Spot Market Limitation (24-Hour Limit)
    A
    In it July 25, 2001 Order, FERC restricted the refund proceedings to “spot
    transactions in the organized markets operated by the ISO and PX during the
    [Refund Period].” July 25, 2001 Order, 
    96 FERC ¶ 61,120
     at 61,499. In its June
    19 Order, it defined the spot market at issue as constituting “sales that are 24 hours
    or less and that are entered into the day of or day prior to delivery.” June 19, 2001
    Order, 
    95 FERC ¶ 61,418
     at 62,545. By these two orders, FERC excluded sales
    made in the Cal-ISO and CalPX spot markets of greater than 24 hours. Although
    this limitation was made without explanation, it apparently was based on FERC’s
    construction of the original SDG&E complaint. The California Parties petition for
    review of this limitation.7
    7
    As a threshold matter, FERC argues that the California Parties’ and Cal-
    ISO’s arguments are procedurally defaulted because they were not raised on
    rehearing. 16 U.S.C. § 825l(b) provides that a party may obtain review in this
    (continued...)
    71
    In order to analyze this issue properly, a brief procedural review is
    appropriate. In the original complaint, SDG&E asked FERC to put a price cap on
    all sales into the Cal-ISO and CalPX markets and urged FERC to enter into a “full
    examination of the reasons why the ISO/PX markets are not workably
    competitive.” In its August 23, 2000 Order, FERC instituted hearing proceedings
    to “detect and . . . to resolve as expeditiously as possible, any defects in the
    operation of competitive power markets in California.” 
    92 FERC ¶ 61,172
     at
    61,603.
    Although FERC mentioned the “spot market” in the body of its August 23
    order, it did not explicitly define spot transactions or limit its investigation to
    transactions of a certain length. See 
    id. at 61,605, 61,607
    . FERC did inform
    interested parties that it may “further refine” or “narrow the focus” of the hearing
    after it reviewed its own staff’s investigative findings. See 
    id. at 61,603, 61,609
    .
    7
    (...continued)
    court by filing a petition “within sixty days after the order of the Commission
    upon the application for rehearing.” We, however, cannot consider an objection
    “unless such objection shall have been urged before the Commission in the
    application for rehearing.” 
    Id.
     In their multiple requests for rehearing of FERC’s
    orders, the California Parties fairly raised objections to FERC’s limitation of price
    mitigation to the Cal-ISO real-time market, and its limitation of refunds to “spot
    sales.” Thus, FERC had the opportunity to address the Caifornia Parties’
    challenges and we have jurisdiction to consider FERC’s limitation. See
    Transmission Access Policy Study Group, 225 F.3d at 685 n. 4.
    72
    On November 1, 2000, after FERC’s staff issued its findings, FERC issued
    an order identifying serious market flaws that had caused and “ha[d] the potential
    to cause, unjust and unreasonable rates for short-term energy (Day-Ahead, Day-of,
    Ancillary Services and real-time energy sales) under certain conditions.”
    November 1, 2000 Order, 
    93 FERC ¶ 61,121
     at 61,349. FERC proposed remedies
    designed to “facilitate forward contracting” and discourage an “over reliance on
    spot markets.” 
    Id. at 61,359
    .
    On December 15, 2000, FERC again stressed that high prices were mostly
    due to over-reliance on short-term contracts, and encouraged market participants to
    acquire both short-term and long-term contracts. December 15, 2000 Order, 
    93 FERC ¶ 61,294
     at 61,993-61,994. Although market participants expressed
    concerns that long-term contracts would be affected by the “spiraling spot prices”
    from the previous summer, FERC assured them that it would “monitor prices in
    [long-term] markets and also adopt a benchmark that we will use as a reference
    point in addressing any complaints regarding the pricing of long-term contracts
    negotiated over the next year.” 
    Id. at ¶ 61,994
    .
    FERC first explicitly limited refunds to spot markets in its July 25, 2001
    Order, stating, “[t]he Commission makes clear that transactions subject to refund
    are limited to spot transactions in the organized markets operated by the ISO and
    73
    PX during the [refund period].” July 25, 2001 Order, 
    96 FERC ¶ 61,120
     at 61,499.
    FERC used the same description for “spot market” as it had in its June 19 order.
    
    Id. at ¶ 61,515-61,516
    .
    In contesting this limitation, the California Parties offered testimony from
    economist Dr. Peter Fox-Penner and Director of Market Monitoring and Analysis
    for Southern California Edison Dr. Gary A. Stern to support their claim that sellers
    manipulated both short-term energy markets and forward markets and succeeded in
    raising rates above just and reasonable levels in both. Dr. Fox-Penner testified that
    sellers had purposefully manipulated short-term energy markets to cause an
    increase in forward rates by withholding supply from the short-term market,
    forcing Cal-ISO to buy necessary energy outside of the spot market at higher prices
    and for longer contract periods. Dr. Stern testified that if the MMCP mitigation
    method were applied to Cal-ISO’s forward contracts, refunds would exceed $54.5
    million.
    Despite this testimony, FERC continued to limit refunds to “spot market”
    transactions as described in its June 19, 2001 order. See March 26, 2003 Order,
    
    102 FERC ¶ 61,317
     at 62,084. The California Parties requested rehearing of
    FERC’s decision, arguing that after they had submitted additional evidence
    showing that the sellers’ insistence on longer duration sales was often an element
    74
    of the exercise of market power, and that FERC should have reconsidered its
    decision to exclude forward contracts from the monitoring and mitigation plan.
    The California Parties argued that FERC should include in the Remedy
    Proceedings all sales up to one month in duration. FERC responded on October
    16, 2003, by rejecting the California Parties’ arguments as being “identical to those
    they have already raised,” and stating that it had “already thoroughly considered
    and rejected” the same arguments. San Diego Gas & Elec.. Co., et. al., 
    105 FERC ¶ 61,066
    , 61,365 (2003).
    B
    FERC’s primary reason for excluding the forward market transactions is that,
    in its view, these transactions were not included in the original SDG&E complaint.
    It notes that its § 206 refund authority “is discretionary and limited to those rates
    challenged as the subject of a proceeding.” Thus, FERC argues that it was
    prevented from mitigating forward transactions because the original complaint
    limited the scope of the proceeding to only “spot market” transactions.
    The record does not support FERC’s conclusion. The original complaint
    explicitly referred to both short-term and forward sales in the Cal-ISO and CalPX
    markets. SDG&E expressed concern about the “day-ahead, hour-ahead, and block
    forward markets conducted by the PX.” The complaint clearly challenged rates for
    75
    forward transactions, asserting that “until workable competition is established,
    supply bids into the California forward and real-time markets should be capped at
    $250 per Mwh.” (emphasis added). The complaint logically did not reference sales
    outside the ISO and PX’s formal markets because SDG&E was, at that time,
    required to purchase energy through the formal spot markets. However, within that
    limitation, SDG&E cast as wide a net as possible, including challenging those
    forward transactions it was allowed to enter. The original complaint did not limit
    FERC’s section 206 refund authority to only “spot market” transactions. Thus, the
    primary reason given by FERC for excluding the transactions is without adequate
    foundation in the record.
    FERC does not offer any other justification for excluding the transactions.
    Significantly, even in the face of new evidence concerning forward markets, FERC
    simply reiterated that the issue was outside the scope of the original complaint.
    FERC’s failure to even address the additional evidence is another reason that we
    reject its exclusion of these transactions.
    FERC initially thought spot prices would discipline forward prices, and that
    more forward contracting was the answer to the market dysfunction. Thus, early in
    the Remedy Proceedings, FERC focused its mitigation measures on short-term
    sales and actually encouraged market participants to acquire more forward
    76
    contracts. See December 15, 2000 Order, 
    93 FERC ¶ 61,294
     at 61,993-61,994.
    However, later evidence suggested that forward prices had not been reigned in by
    FERC’s mitigation of the spot markets, and that sellers had successfully
    manipulated forward markets to raise prices.
    In denying rehearing of its continued exclusion of forward transactions,
    FERC did not explain why the new evidence had no effect on its decision. See 
    105 FERC ¶ 61,066
     at 61,365-61,366. FERC merely referenced its previous
    explanation, from its December 19, 2001 Order, in which it found that only the
    rates in “spot markets” were potentially unjust and unreasonable. However, FERC
    issued that order before the California Parties had offered additional evidence to
    support their claim. FERC never explained why the additional evidence did not
    affect its decision to limit mitigation procedures to only “spot market” transactions.
    We should uphold FERC’s decision if its path to making that decision “may
    reasonably be discerned.” See Motor Vehicle Mfrs. Ass’n, 
    463 U.S. at 43
    .
    However, it is difficult, if not impossible, to discern FERC’s analytical path here,
    particularly when its decision is viewed in light of its simultaneous decision to
    expand mitigation measures to include other previously excluded categories of
    transactions.
    77
    For instance, FERC expanded its mitigation measures to include non-
    emergency hours, even though it had earlier believed that rates in non-emergency
    hours would be sufficiently disciplined by its mitigation measures in emergency
    hours. See December 19, 2001 Order, 
    97 FERC ¶ 61,275
     at 62,247. FERC later
    recognized new evidence that refuted its earlier belief and acted accordingly,
    expanding its mitigation measures to include all operating hours. When sellers
    argued against this expansion, FERC responded:
    As Commission orders are not final while subject to rehearing, and
    rehearing was requested of all orders in this proceeding, the mitigation
    measures and related procedures implemented in those orders were
    subject to adjustment or replacement. Sellers could not reasonably
    have expected therefore, that the mitigation measures and related
    procedures implemented in earlier orders in this proceeding would
    remain unchanged during the rehearing process.
    
    Id. at 62,218
    .
    FERC’s explanation applies with equal force here. Throughout the
    proceedings, FERC emphasized that it was engaged in a continuing examination of
    all market forces. Its investigation was not static and yet it proffered no reason for
    rejecting the new evidence that suggested that the forward market was affected by
    market manipulation that may have produced unjust and unreasonable rates. When
    faced with a similar situation in which FERC acted differently in two related
    78
    situations without offering a reasoned explanation, we have granted a petition for
    review. See Cal. Dep’t of Water Res. v. FERC, 
    341 F.3d 906
    , 910 (9th Cir. 2003).
    FERC’s decision to foreclose relief in the forward markets cannot be
    sustained. Its cramped reading of the original SDG&E complaint is not supported
    by a close examination of the record, and FERC does not offer any other
    explanation for its decision. In view of the evidence tendered by the California
    Parties that sellers manipulated both the short term and long term spot markets,
    FERC’s limitation of remedy without a reasonable explanation was arbitrary,
    capricious, and an abuse of discretion.8
    VII
    Energy Exchange Transactions
    A
    8
    The Public Entities argue that FERC erred in finding that some of the
    Public Entities’ transactions with Cal-ISO were spot market transactions – not
    multi-day transactions – and thus subject to refunds pursuant to FERC’s orders.
    The California Parties have moved to strike this contention because it involves
    implementation questions not appropriate for this phase of the proceedings. Given
    our decision that the forward market transactions are subject to refund liability, the
    issues raised by the Public Entities are likely moot. However, to the extent that
    any issues remain, we grant the California Parties’ motion because the questions
    raised by the Public Entities are fact-specific inquiries as to the nature of particular
    transactions that are appropriately considered in conjunction with implementation
    issues.
    79
    Exchange transactions involved two different sellers. The first seller, the
    “Exchange Seller,” agreed to provide Cal-ISO with energy in exchange for an in-
    kind return of the same amount of energy plus an additional agreed-upon amount.
    See March 26, 2003 Order, 
    102 FERC ¶ 61
    ,317at 62,083-62,084. Cal-ISO then
    purchased energy from the second seller, the “Spot Seller,” on the spot market and
    used that energy to pay back the Exchange Seller. In a typical exchange
    transaction, an Exchange Seller would provide Cal-ISO with one unit of power in
    exchange for Cal-ISO’s promise to return two units of power at a later time. Cal-
    ISO would use the one unit of power to supply its power grid. Then Cal-ISO
    would buy two units of power from a Spot Seller in order to pay back the Exchange
    Seller. Exchange transactions had varying return ratios. At times, the parties
    agreed that Cal-ISO must return the energy in “like time,” for instance in “on-peak”
    hours.
    Cal-ISO’s purchases on the spot market were mitigated when FERC ordered
    Spot Sellers to refund amounts they had charged in excess of the MMCP. See 
    id. at 62,084
    . However, FERC declined to include Exchange Sellers in the Refund
    Proceedings.
    The California Parties and Cal-ISO challenge the exclusion of Exchange
    Sellers, contending that they also should be liable for refunds because they used
    80
    exchange transactions to exert market power by demanding exorbitant exchange
    ratios. The California Parties’ witness, Dr. Carolyn Berry, an independent
    economic consultant and former FERC economist, testified in support of their
    claim that Exchange Sellers had violated the Federal Power Act. Dr. Berry testified
    that “return ratios were excessively high.” She suggested that Exchange Sellers
    “may have been hoping to avoid refund liability by making sales in-kind rather
    than for explicit monetary payment.” Dr. Berry noted that some of the sellers’
    internal emails supported her conclusion that those sellers were aware that using in-
    kind exchanges was a way for them to avoid FERC’s scrutiny.
    Economist Dr. Peter Fox-Penner also testified on behalf of the California
    Parties regarding exchange transactions. He testified that “[t]here is no economic
    difference to a buyer between paying for a power purchase in dollars and paying
    for it in a commodity whose price is well-established in dollars in the marketplace.
    . . . [thus], there is no economic basis for excluding such transactions from
    mitigation.”
    The Public Entities argue that Cal-ISO actually benefitted from exchange
    transactions because the Exchange Sellers offered desperately needed flexibility in
    a crisis situation. In support of their claim, the Public Entities referred to a Wall
    Street Journal article in which Cal-ISO Vice President Jim Detmers was described
    81
    as praising exchange transactions because they were “a good deal” for California
    and “might even have saved [the state] money because daily peak prices were
    sometimes more than twice the off-peak prices the ISO paid for BPA’s replacement
    power.”
    In its March 26, 2003 Order, FERC held that it would not subject the
    Exchange Sellers to refund liability for exchange transactions. The primary reason
    given by FERC in excluding Exchange Sellers from the Refund Proceedings was
    the difficulty in calculating a refund. March 26, 2003 Order, 
    102 FERC ¶ 61,317
     at
    62,084.
    B
    FERC improperly excluded the Exchange Sellers from the refund
    proceeding. There is no doubt that energy exchanges are considered sales, subject
    to FERC’s jurisdiction. 18 C.F. R. § 35.2(a). By refusing relief simply because the
    calculation was difficult, FERC abandoned its duty under the Federal Power Act to
    ensure just and reasonable rates. See 16 U.S.C. § 824d(a). As we have previously
    stated, “[t]he FPA cannot be construed to immunize those who overcharge and
    manipulate markets in violation of the FPA.” Lockyer, 
    383 F.3d at 1017
    . FERC is
    obligated to protect consumers from unjust or unreasonable rates, charges, or
    classifications, and any rules, regulations, practices, or contracts affecting such
    82
    rates, charges or classifications. See 16 U.S.C. § 824e(a). Nothing in the Federal
    Power Act limits its application to those transactions that are easy to value.
    Although multiple variables may make certain transactions difficult to analyze,
    consumers must still be assured that those transactions are just and reasonable.
    FERC’s approach to the exchange transactions created a loophole through
    which Exchange Sellers could exercise market power and manipulate the energy
    market without being subjected to the requirements of the Federal Power Act.
    FERC’s failure to exercise its broad remedial discretion to analyze exchanges of
    power during the Refund Period and address any unjust and unreasonable practices
    was arbitrary and capricious, and an abuse of discretion.
    FERC argues that it is impossible to determine whether the Exchange Sellers
    demanded unjust and unreasonable exchange ratios because there is no way to
    assign a monetary value to exchange transactions. FERC claims that, because
    exchange transactions involved multiple variables like the shortage of hydro-
    electric generation power in the Pacific Northwest, it cannot determine whether
    Exchange Sellers demanded and received value in excess of what would have been
    just and reasonable under the circumstances. However, FERC did not conduct a
    specific analysis to conclude that the rates were just and reasonable, given the
    83
    variables, nor did it make a finding that the variables showed that the rate was just
    and reasonable. FERC simply concluded that the calculation was too difficult.
    The challenge of monetizing the transactions does not give FERC a safe
    harbor to throw up its hands and say it can’t be done. Significantly, FERC did not
    provide a reasoned explanation of impossibility, only a conclusory observation of
    difficulty. But saying so doesn’t make it so. Constructing a methodology did not
    prove too taxing for the California Parties, who tendered a mitigation methodology
    for examining the Exchange Sellers’ transactions. FERC rejected the California
    Parties’ proposed mitigation method because it did not account for all relevant
    variables. See March 26, 2003 Order, 
    102 FERC ¶ 61
    ,317at 62,084 (“The CA
    Parties’ request to reform the exchange ratio completely ignores the severe energy
    shortfall in the Pacific Northwest, where most of these energy exchange
    transactions originated, during the 2001 time period.”).
    The fact that FERC was dissatisfied with the California Parties’ proposed
    mitigation method does not justify its decision to exclude Exchange Sellers from
    the refund proceeding on a categorical basis. FERC’s own precedent shows that
    when parties have failed to propose an acceptable mitigation method, it may
    fashion a method on its own. See Re Green Mountain Power Corp., 
    61 FERC ¶ 84
    61,203 (1992) (using the value of a contemporaneous cash sale from the same
    power unit to value an exchange of capacity for purposes of ordering a refund).
    FERC also argues that because the energy exchanges were conducted over
    periods greater than 24 hours, the transactions cannot be considered spot market
    transactions subject to mitigation. However, we have already rejected this
    argument as a general matter, so it does not afford FERC a valid basis for
    excluding the transactions at issue here.
    In sum, because FERC did not articulate a valid basis for excluding the
    energy exchange transactions from the Refund Proceedings, we conclude that its
    action was arbitrary, capricious, and an abuse of discretion.
    VIII
    Sleeve Transactions
    “Sleeve transactions” were used when the investor-owned utilities were on
    the brink of insolvency and credit problems began to limit the ability of the
    investor-owned utilities to purchase power. As FERC described it:
    A “sleeve” transaction involves three parties: a seller, a purchaser and
    a creditworthy third party “sleever” or “sleeving party” who provides
    the financial underpinnings for the transaction. Thus, if either party to
    a transaction determines that it cannot buy from or sell to its
    commercial counterparty due to concerns about the other party’s
    85
    creditworthiness, the sleeving party steps in to provide the necessary
    financial backing so that the transaction can go forward.
    San Diego Gas & Elec. Co., et. al., 
    107 FERC ¶ 61,165
     at 61,640 (2004).
    To obtain adequate supplies of energy to continue to power the grid, Cal-ISO
    entered into transactions whereby sleeving parties would buy power directly from
    energy sellers and then resell the power to Cal-ISO at a premium to reflect the
    credit risk.
    Cal-ISO decided that certain sleeve transactions should not be subject to
    mitigation, but the ALJ reached the opposite conclusion. After considering the
    ALJ report, FERC determined that the sleeve transactions should be subject to
    mitigation; in other words, those transactions should not be excluded from
    potential refund liability. FERC concluded that the sleeve transactions were
    similar to other sales and that the sleeving parties assumed the same risks of
    making spot energy sales to Cal-ISO, including the risk of refund liability.
    Therefore, FERC adopted the ALJ’s findings and included the sleeve transactions
    as part of the refund proceedings. The Public Entities now petition for review of
    86
    that decision, arguing that sleeve transactions were individually negotiated
    transactions outside the scope of the Remedy Proceedings.9
    The Public Entities contend that the sleeve transactions should not be
    included in the refund proceedings because the sleeving parties merely acted as
    financial intermediaries and facilitators. In their view, the sleeve transactions were
    individually negotiated transactions that did not take place in the single-price
    auction market. FERC contends that the parties saw the sleeve transactions as
    comprising two sales: one from the supplier to the sleeving party and the second
    from the sleeving party to Cal-ISO. In FERC’s view, the sleeving parties were
    subject to Cal-ISO rules because all sellers in the Cal-ISO market had the
    9
    The California Parties moved to strike the portion of Public Entities’
    briefs addressing sleeve transactions, and El Paso Merchant Energy moved to
    defer consideration of sleeving issues. Both parties argue that consideration of
    sleeving is an issue of implementation, not an issue of scope, and therefore
    belongs in the next round of briefing. However, there is no principled way to
    distinguish a hypothetical exemption for sleeve transactions, as a distinct category,
    from the exemptions or non-exemptions FERC has considered, and we are now
    considering, for OOM, energy exchange, forward market, and other categories of
    transactions. Sleeve transactions appear to be a distinct category, subject to the
    same type of analysis as the other issues. We therefore deny the California Parties
    and El Paso Merchant Energy’s motions as to sleeve transactions and consider the
    merits of Public Entities’s claim that sleeve transactions as a category should have
    been exempted. However, to the extent that the Public Entities are raising fact-
    specific issues related to implementation, as opposed to a categorical challenge,
    we grant the California Parties’ motion.
    87
    responsibility to comply with market rules and the tariff. The final transaction of
    the two-step process occurred, according to FERC, in the Cal-ISO market.
    The record supports FERC’s conclusion. All sleeve transactions that are
    subject to challenge here occurred as spot market transactions in the Cal-ISO
    market. The fact that the sleeving parties received a risk premium does not relieve
    them from liability if, independent of the risk premium, they charged an unjust and
    unreasonable rate in the spot market, which was part and parcel of the Cal-ISO
    market. Thus, FERC did not act arbitrarily or capriciously, or abuse its discretion
    in including the sleeve transactions in the refund proceeding.
    IX
    California Energy Resources Scheduling (“CERS”) Division Transactions
    A
    In its December 8, 2001 Order, FERC lifted the Cal-ISO price caps, hoping
    to attract more supply into the auction markets. December 8, 2000 Order, 
    93 FERC ¶ 61,239
    . In its December 15, 2001 Order, FERC eliminated the requirement that
    the investor-owned utilities buy and sell all energy through CalPX. December 15,
    2001 Order, 
    93 FERC ¶ 61,294
    . As we have discussed, when these remedies did
    not stem the rise of electricity prices, and the investor-owned utilities were on the
    brink of insolvency, Governor Davis ordered CERS to enter into contracts to buy
    88
    power directly on behalf of California consumers. These purchases were made in
    bilateral contracts outside the CalPX and Cal-ISO markets and totaled more than $5
    billion of purchases.
    On March 1, 2001, the Cal-EOB filed a motion with FERC, asking FERC to
    clarify that the Remedy Proceedings included CERS transactions. FERC denied
    the motion, concluding that the bilateral transactions were entered into outside the
    CalPX and Cal-ISO markets, and therefore, were outside the scope of the Remedy
    Proceedings. In its order, FERC noted that “if DWR or another party believes that
    any of its contracts are unjust or unreasonable, it may file a complaint under FPA
    Section 206 . . . .” CPUC and Cal-EOB filed such complaints, which are the
    subject of separate petitions for review before this Court. See Pub. Utilits. Comm’n
    of State of Cal. et. al. v. FERC, nos. 03-74207, et. al. In this case, the California
    Parties petition for review of FERC’s decision to exclude the CERS transactions
    from the Remedy Proceedings, and the various FERC orders denying rehearing.
    We conclude that FERC’s decision to exclude the CERS transactions was not
    arbitrary, capricious, or an abuse of discretion.
    B
    One of the fundamental tenets in FERC jurisprudence is the rule against
    retroactive ratemaking. Arkansas Louisiana Gas Co. v. Hall, 
    453 U.S. 571
    , 578
    89
    (1981). This theory underpins the limitations on FERC’s remedies under § 206 to
    the post-complaint period. § 824e(b). Consol. Edison Co. of N. Y., Inc. v. FERC,
    
    347 F.3d 964
    , 967 (D.C. Cir. 2004). If FERC finds a rate unjust and unreasonable
    pursuant to a § 206 complaint, it must order imposition of a just and reasonable
    rate; however, the refund is limited to periods subsequent to the “refund effective
    date” established by FERC, which must be at least sixty days after the filing of the
    complaint. Id. By this procedure, once a complaint is filed, sellers are on notice
    that their sales may be subject to refund.
    Thus, while FERC has considerable latitude in fashioning § 206 relief, the
    remedies afforded pursuant to a third party § 206 complaint must have a sufficient
    nexus to the substantive allegations of the complaint so that market participants are
    placed on notice that they are at risk for sales made after the refund effective date.
    We have already concluded that the substantive allegations of the SDG&E
    complaint were sufficient to put sellers on notice that the OOM, non-emergency,
    energy exchange, and sleeve transactions might be subject to refund. All of these
    transactions were directly associated with the CalPX and Cal-ISO markets.
    However, the bilateral CERS transactions occurred in a different market – one that
    did not even exist when the SDG&E complaint was filed. Thus, neither the
    SDG&E complaint nor the subsequent actions by FERC in establishing the Remedy
    90
    Proceedings were sufficient to put participants in the CERS transactions on notice
    that their sales might be subject to refund.
    There are fundamental differences between the CalPX/Cal-ISO markets and
    the bilateral contracts negotiated by CERS. As we have discussed, the CalPX and
    Cal-ISO markets were centralized, single-price, auction markets, involving
    multiple participants. In contrast, the CERS transactions were two-party contracts
    of varying prices, terms and duration that were mutually negotiated – ostensibly at
    arms-length – outside the CalPX and Cal-ISO markets. Unlike the Cal-ISO OOM
    and sleeve transactions that we have concluded were properly considered in the
    Refund Proceedings, the CERS transactions occurred in a market that was not
    directly influenced by the market manipulations in the Cal-ISO and CalPX spot
    markets. The record reflects no direct nexus between the CERS bilateral
    transactions and the CalPX and Cal-ISO spot markets.
    Given these differences, and the fact that the entire focus of the SDG&E
    complaint and FERC’s orders creating the Remedy Proceedings were directed at
    the CalPX and Cal-ISO markets, it is clear that the substantive allegations of the
    SDG&E complaint did not bear a sufficient nexus to the bilateral CERS
    transactions to afford parties to the CERS contracts sufficient notice that their sales
    might be subject to refund.
    91
    Indeed, when the SDG&E complaint was filed, the investor-owned utilities
    were required to conduct all of their sales and purchases through the CalPX and
    Cal-ISO markets. It was not until FERC’s December 15, 2000 Order, some six
    months after the filing of the SDG&E complaint, that investor-owned utilities were
    free to conduct energy transactions outside the CalPX and Cal-ISO markets. And,
    it was not until January, 8, 2001 that CERS began to make its purchases.
    Thus, FERC concluded that:
    DWR transactions are negotiated bilateral contracts for the
    procurement of energy on behalf of California [investor-owned
    utilities], and are distinctly beyond the realm of ISO and PX
    centralized market operations that have been the subject of this
    proceeding since its inception . . . . No party could reasonably have
    believed that the Commission intended the proceeding to be broader.
    December 19, 2001 Order, 
    97 FERC ¶ 61,275
     at 62, 195.
    We agree with FERC’s analysis. Because the SDG&E complaint was not
    sufficient to put the CERS transaction participants on notice, expanding the Refund
    Proceeding to include the CERS transactions would violate the rule against
    retroactive ratemaking.
    The California Parties argue, with considerable force, that unjust and
    unreasonable rates were charged in the CERS transactions and that the transactions
    92
    in substance were indistinguishable from transactions within the CalPX and Cal-
    ISO markets. However, FERC did not close the door on potential § 206 relief
    based on the CERS transactions; in fact, it invited aggrieved participants to file
    new complaints directed specifically at the CERS transactions. Thus, while the
    bilateral CERS transactions are beyond the scope of the Remedy Proceedings at
    issue here, those transactions may be the subject of other challenges, the posture
    and merits of which are beyond the scope of the instant case.
    Given all of this, we conclude that FERC’s construction of the SDG&E
    complaint as not including the CERS transactions was not arbitrary, capricious, or
    an abuse of discretion.
    X
    Port of Oakland and Other Bilateral Transactions
    The Port of Oakland argues that its bilateral contracts with energy suppliers,
    entered into during the CERS period to meet the needs of Oakland’s airport, should
    also be subject to the Refund Proceedings. FERC denied the request on the same
    basis that it denied the California Parties’ entreaty to include the CERS transactions
    in the Refund Proceedings. The analysis of the CERS and Port of Oakland
    transactions is the same. We deny the petition for review filed by the Port of
    93
    Oakland for the same reasons that we deny the petition by the California Parities
    for review of the CERS transactions.
    XI
    Section 202(c) Transactions
    By December 2000, in the middle of the energy crisis, energy suppliers were
    reluctant to bid into the CalPX and Cal-ISO auction markets because the investor-
    owed utility buyers in those markets were verging on insolvency. In order to
    correct for this shortage of sales, Cal-ISO requested the United States Department
    of Energy to intervene. Pursuant to Cal-ISO’s request, the Department of Energy
    issued a series of orders under the emergency provisions of Federal Power Act §
    202(c), which required energy suppliers to sell excess available power to Cal-ISO.
    The Public Entities were parties to some of these sales, which were later exempted
    from a refund by FERC because of the fact that they were compulsory.
    The Public Entities attack FERC’s affirmance of the ALJ’s conclusion that
    certain of these sales were exempt from refund liability. The California Parties
    have moved to strike this argument on the basis that it constitutes an
    implementation issue to be decided in a different phase of this case, rather than an
    issue that concerns the scope of the refund proceeding.
    94
    No party challenges FERC’s determination that sales pursuant to § 202(c)
    are exempt from refund liability. The Public Entities do not argue that § 202(c)
    transactions categorically should or should not be included in the scope of the
    refund proceeding. Rather, the Public Entities contest the manner in which FERC
    determined the definition – the scope – of the § 202(c) exemption. The Public
    Entities do not argue that any particular category or subcategory of transactions
    should be considered § 202(c) transactions. Instead, they take issue with the
    methods and information FERC uses to determine what is a § 202(c) exemption.
    Thus, we conclude that the § 202(c) issues raised by the Public Entities should be
    considered an implementation issue, rather than a scope transaction issue.
    Therefore, we grant the California Parties’ Motion to Strike with respect to §
    202(c) transactions.
    XIII
    Conclusion
    In general, we hold that all the transactions at issue in this case that occurred
    within the CalPX or Cal-ISO markets, or as a result of a CalPX or Cal-ISO
    transaction, were the proper subject of the Refund Proceedings. We deny the
    petitions for review that challenge FERC’s inclusion of such transactions; we grant
    the petitions for review that challenge FERC’s exclusion of such transactions. We
    95
    deny the petitions for review that seek to expand the Refund Proceedings into the
    bilateral markets other than the CalPX and Cal-ISO markets. We hold that FERC
    properly established October 2, 2000 as the refund effective date for the § 206
    proceedings. We hold that FERC erred in excluding § 309 relief for tariff
    violations that occurred prior to October 2, 2000.
    Specifically, we (1) deny the Competitive Suppliers Group’s petition for
    review challenging FERC’s establishment of the effective refund date; (2) grant the
    California Parties’ petition for review of FERC’s decision to exclude § 309 relief;
    (3) deny the Competitive Suppliers Group’s petition for review challenging the
    inclusion of the OOM transactions in the Refund Proceedings; (4) grant the
    California Parties’ petition for review challenging FERC’s exclusion of forward
    market transactions from the Refund Proceedings; (5) grant the California Parties’
    petition for review challenging FERC’s exclusion of the energy exchange
    transactions from the Refund Proceedings; (6) deny the Public Entities’ petition for
    review challenging FERC’s includion of sleeve transactions in the Remedy
    Proceedings; (7) deny the California Parties’ petition for review challenging
    FERC’s exclusion of the CERS transactions from the Remedy Proceedings; (8)
    deny the Port of Oakland’s petition for review challenging FERC’s exclusion of its
    bilateral CERS transactions from the Remedy Proceedings; and (9) grant the
    96
    motion of the California Parties to exclude the Public Entities’ § 202(c) and
    challenges to the categorization of multi-day transactions from this proceeding.
    Each party shall bear its own costs on appeal.
    PETITIONS GRANTED IN PART; DENIED IN PART; REMANDED
    FOR FURTHER PROCEEDINGS.
    97
    COUNSEL
    Stan Berman, Heller Ehrman White & McAuliffe, Seattle, Washington; Kevin J.
    McKeon, Hawke McKeon Sniscak & Kennard, Harrisburg, Pennsylvnia for
    petitioner-intervenor and respondent-intervenor California Parties.
    Robert A. O’Neil, San Diego City Attorney’s Office, San Diego, California for
    petitioner-intervenor City of San Diego.
    Dennis Lane, Solicitor, Federal Energy Regulatory Commission, Washington, D.C.
    for respondent Federal Energy Regulatory Commission.
    Mark W. Pennak, Department of Justice, Civil Division, Washington, D.C. for
    respondent-intervenor and petitioner-intervenor Bonneville Power Administration.
    Harvey L. Reiter, Morrison & Hecker, Washington D.C. for respondent-intervenor
    and petitioner-intervenor Indicated Public Entities.
    David C. Frederick, Kellogg, Huber, Hansen, Todd, Evans & Figel, Washington,
    D.C.; Lawrence G. Acker, LeBoeuf, Lamb, Greene & MacRae, Washington, D.C.;
    Ronald N. Carroll, Foley & Lardner, Washington, D.C. for petitioner-intervenor
    and respondent-intervenor Competitive Suppliers Group.
    Charles F. Robinson, Folsom, California; J. Phillip Jordan, Swidler Berlin Shereff
    Friedman, Washington, D.C. for intervenor California Independent System
    Operator Corporation.
    David L. Alexander, Oakland, California; James M. Costan, McGuire Woods,
    Washington, D.C. for petitioner Port of Oakland.
    Randolph Q. McManus, Baker Botts, Washington, D.C. for intervenor Indicated
    Generators.
    98
    Natalie L. Hocken, Portland, Oregon; Stuart F. Pierson, Troutman Sanders,
    Washington D.C. for respondent-intervenor PacifiCorp.
    Kenneth W. Irvin, McDermott Will & Emery, Washington, D.C. for intervenor El
    Paso Merchant Energy, L.P.
    99
    

Document Info

Docket Number: 01-71051

Citation Numbers: 462 F.3d 1027

Filed Date: 8/31/2006

Precedential Status: Precedential

Modified Date: 1/12/2023

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