253 F.3d 748 (D.C. Cir. 2001)
Alliant Energy Corporation, et al., Petitionersv.Federal Energy Regulatory Commission, RespondentEnron Power Marketing, Inc., et al., IntervenorsEnron Power Marketing, Inc., Petitionerv.Federal Energy Regulatory Commission, RespondentMidAmerican Energy Company, et al., Intervenors
No. 99-1448, No. 99-1544
United States Court of Appeals,DISTRICT OF COLUMBIA CIRCUIT
Argued April 6, 2001Decided June 19, 2001

Steven J. Ross argued the cause for the MAPP Members as  petitioners in No. 99-1448 and as intervenors in No. 99-1544. Catherine M. Giovannoni and Richard T. Saas were on brief.
Jeffrey D. Watkiss argued the cause for Enron Power  Marketing, Inc. as petitioner in No. 99-1544 and as intervenor in No. 99-1448.  Ronald N. Carroll was on brief.
David H. Coffman, Attorney, Federal Energy Regulatory  Commission, argued the cause for the respondent.  Dennis  Lane, Solicitor, Federal Energy Regulatory Commission, was  on brief.
Donna M. Attanasio argued the cause for intervenors  Northern States Power Company and Northern States Power  Company (Wisconsin) in No. 99-1448.  Earle H. O'Donnell  was on brief.
Isaac D. Benkin was on the brief of intervenor Nebraska  Public Power District in No. 99-1448.
Before:  Williams, Sentelle and Henderson, Circuit  Judges.
Opinion for the court filed by Circuit Judge Henderson.
Karen LeCraft Henderson, Circuit Judge:


1
The petitioners  challenge two decisions of the Federal Energy Regulatory  Commission (Commission or FERC) that ordered the MidContinent Area Power Pool (MAPP) to refund "third party  compensation" charges it assessed customers after March 1,1997 for transmitting electricity into or outside of the MAPP  geographical area.  First, a group of petitioning MAPP members (MAPP petitioners) assert that the ordered refunds are  impermissibly retroactive and that they were incorrectly calculated.  In addition, petitioner Enron, a MAPP member and  beneficiary of the refunds, maintains the refunds should  include not only the third party compensation charges, as the  Commission directed, but also a portion of the amounts  Enron paid MAPP border utilities, based on their tariff rates,  to transmit the energy inside or outside the MAPP area.  For  the reasons set forth below, we reject all of the petitioners'  arguments and deny both petitions for review.

I.

2
MAPP is an association of energy transmission utilities,  generators and marketers serving an area encompassing part  or all of several midwestern and western states and two  Canadian provinces.  Among other functions, MAPP coordinates energy sales and transmissions between and among its  members.  Before 1994 MAPP's energy pooling agreement  required its members to provide free, reciprocal transmission  service to other members.  In 1994 the pooling agreement  was amended with the addition of a tariff, "Schedule F," that  imposed a charge for transmissions among MAPP members,  but at a discounted distance-based rate rather than at the  individual transmitting members' filed tariff rates.  FERC  accepted the new agreement, including Schedule F, in a  decision dated December 15, 1994.  Mid-Continent Area  Power Pool, 69 F.E.R.C. p 61,347 (1994).  The Commission  provided the following explanation for its decision to accept  the new schedule:


3
Notwithstanding our concerns with the calculations and adjustments discussed above, we will accept the proposed MAPP rates for filing because MAPP's methodology produces rates that are just and reasonable and not unduly discriminatory or preferential when tested against traditional standards.  We note that the single system-wide MAPP rate that members will pay for ser vice over the entire MAPP system is lower than the rate that each jurisdictional MAPP member could separately propose under a traditional rate while taking into account distance and power flows.


4
Id. at 62,307.


5
In March 1996 MAPP filed a proposed restated pooling  agreement that amended Schedule F to include a new section  2.4 requiring that a MAPP member purchasing energy from  or selling energy to a non-member arrange for extra-MAPP  transmission with a MAPP border utility (paying the border  utility's tariff for the transmission) and, in addition, that the  member pay MAPP itself the Schedule F intra-pool transmission charge in order "to compensate Members for third party  use of their systems in connection with [the] sales or purchases."  Joint Appendix (JA) 56.1


6
On May 16, 1996 the Commission issued "Order 888," a  final rule which requires generally that each public utility,  and utility pool, file an "open access tariff" by a specific  deadline.  Promoting Wholesale Competition Through Open  Access Non-discriminatory Transmission Services by Public  Utilities and Recovery of Stranded Costs by Public Utilities  and Transmitting Utilities, Order No. 888, 61 Fed. Reg.  21,540, 21,541 (1996) (codified at 18 C.F.R. § 35.28).  The  order required power pools such as MAPP to file both  "reformed power pooling agreements" and "a joint pool-wide  Final Rule pro forma tariff" not later than December 31,  1996.  Id. at 31,728.  The reformed power pool agreement  must "establish open, non-discriminatory membership provisions and modify any provisions that are unduly discriminatory or preferential."  Id.  The tariffs, like all open access  tariffs filed under Order 888, are required to conform both to  the "pro forma tariff" set out in the final rule2 and to FERC's  1994 Transmission Pricing Policy Statement, 59 Fed. Reg.  55,031 (1994), clarified, 71 F.E.R.C. p 61,195 (1995) (Policy  Statement).3  See Order 888, 61 Fed. Reg. at 21,541, 21,61819.


7
On September 12, 1996 the Commission issued a decision  accepting the restated MAPP agreement filed the previous  March, including Schedule F.  Mid-Continent Area Power  Pool, 76 F.E.R.C. p 61,261 (1996).  The Commission noted its  1994 order had found that the tariff's methodology, "while  flawed, produced rates that were just and reasonable and not  unduly discriminatory or preferential when tested against  traditional standards" because "the single system-wide MAPP  rate that members would pay for service over the entire  MAPP system would be lower than the rate that each publicutility MAPP member could separately propose under a  traditional, postage stamp rate while taking into account  distance and power flows."  Id. at 62,341-42 (citing 69  F.E.R.C. at 62,307).  The 1996 restated Schedule F, the  Commission concluded, "still produces rates that are reasonable when compared to the rate that each public-utility  MAPP member could separately propose using a traditional,  postage stamp rate methodology."  Id. at 62,342.  The Commission nevertheless warned MAPP:


8
Nothing in this order relieves MAPP public utility members of their obligations under Order No. 888 to file a joint pool-wide pro forma tariff no later than December 31, 1996, and to begin to take service under that tariff for all pool transactions no later than December 31, 1996. They must also file a reformed power pooling agreement no later than December 31, 1996 that establishes open, non-discriminatory membership provisions and modifies any provisions that are unduly discriminatory or preferential. When those filings are made, the Commission will review rate and non-rate issues pertaining to MAPP to ensure that MAPP's public utility members are complying with Order No. 888.


9
Id. at 62,336;  see also id. at 63,342 (noting that "issue [of  special rates] can be renewed when MAPP files its joint poolwide pro forma transmission tariff in response to Order No.  888");  id. n.11 ("Under Order No. 888, public-utility members  of loose pools like MAPP must file reformed power pooling  agreements no later than December 31, 1996, and a joint  pool-wide pro forma transmission tariff no later than December 31, 1996.  Therefore, we will soon have another opportunity to review rate issues when the revised MAPP agreement  is filed.").


10
On December 24, 1996 MAPP submitted a "compliance  filing," as required by Order 888, which included a substantially unchanged Schedule F.  On February 20, 1997 Enron,  after being assessed the third party charge for extra-MAPP  transmission in accordance with Schedule F, intervened to  challenge the MAPP compliance filing as inconsistent with  Order 888 and its pro forma tariff.  In an order issued  February 28, 1997 the Commission declared that MAPP's  submissions were "hereby accepted for filing and suspended  for a nominal period, to become effective March 1, 1997,  subject to refund and subject to the issuance of further  orders."  78 F.E.R.C. p 61,203, at 61,883 (1997).


11
On March 10, 1997 Enron sent MAPP a letter complaining  that imposing the Schedule F charges on top of the border  utility's individual tariff rate charge for extra-MAPP transmission was discriminatory.  When the parties failed to resolve the dispute internally or through mediation, Enron filed  a complaint with the Commission on August 19, 1997 asserting MAPP's filing did not conform to the Order 888 pro forma  tariff because it discriminated against extra-MAPP transactions.  Enron sought a declaration that MAPP violated Order  888 by failing to file an open access tariff and by assessing  the third party charges and requested that the Commission  order MAPP to (1) file a conforming nondiscriminatory tariff  without third party additive charges and (2) refund to Enron  the third party charges it had paid.


12
In an order issued April 15, 1999 the Commission directed  MAPP "to eliminate tariff provisions that are related to  member-restricted services," 87 F.E.R.C. p 61,075, at 61,310  (99), and specifically to eliminate section 2.4 which it found  "unacceptable," id. at 61,313.  The Commission also directed  MAPP to provide "refunds for any and all billings under the  compliance tariff ... for transactions periods [sic] commencing March 1, 1997, the date that MAPP's compliance tariff  became effective."  Id. at 61,324.


13
Enron filed a "Request for Clarification or Alternatively  Rehearing" of the April 15, 1999 decision, seeking a declaration that the refunds should include not only the third party charges but also the difference between the transmission  charges Enron paid (based on the border utilities' tariffs) and  what Enron would have paid if charged the discounted member transmission rate.  The MAPP petitioners also filed for  rehearing, on behalf of MAPP, challenging the Commission's  authority to order retroactive refunds and the method of their  calculation.  In an order issued November 1, 1999 the Commission denied each rehearing petition and clarified that the  refunds should be limited to the third party compensation  charges.4


14
Both the MAPP petitioners and Enron petitioned the court  for review.

II.

15
First, MAPP asserts the third party compensation charge  refund ordered by the Commission constitutes retroactive  ratemaking in violation of the Federal Power Act.  "The  governing principle is that when there is a 'substitution of  new law for old law that was reasonably clear,' the new rule  may justifiably be given prospectively-only effect in order to  'protect the settled expectations of those who had relied on  the preexisting rule.'  By contrast, retroactive effect is appropriate for 'new applications of [existing] law, clarifications,  and additions.' "  Public Serv. Co. of Colo. v. FERC, 91 F.3d  1478, 1488 (D.C. Cir. 1996) (quoting Williams Natural Gas  Co. v. FERC, 3 F.3d 1544, 1554 (D.C. Cir. 1993)), cert. denied,  Amoco Prod. Co. v. Public Serv. Co. of Colo., 520 U.S. 1224  (1997).  In this case, the Commission's April 15, 1999 decision  rejecting MAPP's compliance filing and ordering refunds was  a permissible application of existing law, Order 888, which the  Commission had issued on May 16, 1996.  MAPP nonetheless  contends that, when it submitted its compliance filing on  December 24, 1996, it reasonably relied on the Commission's  September 12, 1996 decision accepting Schedule F for filing  and expressly concluding that its methodology, "while flawed,  produced rates that were just and reasonable and not unduly  discriminatory or preferential when tested against traditional  standards."  See 76 F.E.R.C. at 62,341.5  We conclude MAPP  could not reasonably rely on the September 1996 order to  establish that Schedule F, and in particular section 2.4,  complied with Order 888.


16
Order 888 was expressly designed "to remedy undue discrimination in access to the monopoly owned transmission  wires that control whether and to whom electricity can be  transported in interstate commerce."  61 Fed. Reg. at 51,541. Under Order 888 every electrical transmitter was required,  for the first time, to file an open access tariff that conformed  to both the Commission's new pro forma tariff and its 1994  Policy Statement.  61 Fed. Reg. at 21,541, 21,618-19.  Once  this new regime took effect and MAPP made its compliance  filing, as Order 888 required, it could not reasonably rely on  the pre-Order 888 acceptance.  See Public Serv. Co. of Colo.  v. FERC, 91 F.3d 1478, 1490 (D.C. Cir. 1996) (reliance on  Federal Power Commission treatment of state tax under  National Gas Act "would have been foolhardy" because subsequent "enactment of [Natural Gas Policy Act's] substantially  new regulatory regime ... undermined any assurance" that  such treatment would "withstand scrutiny under the [Natural  Gas Policy Act]").  The unreasonableness of MAPP's claimed  reliance is particularly apparent when viewed in context.  The  Commission had expressly warned MAPP in the September  12, 1996 acceptance order that the rates would be reexamined  under Order 888 after the compliance filing due in December  and repeated this warning when it accepted the December  1996 filing subject to refund on February 28 1997.  It should  therefore have come as no surprise to MAPP that the Commission subsequently reexamined Schedule F, found the tariff  was discriminatory under both Order 888 and its pro forma  tariff and ordered refund of overcharges paid after March 1,  1997.6


17
The MAPP petitioners next challenge the refund order on  the ground that the Commission did not determine the  amount charged non-member purchasers and sellers was  above that which was "just and reasonable" so as to warrant a  refund.  They argue that, because the stacked rates of individual members were available as an alternative to Schedule  F and were higher than the Schedule F rates charged, the  Schedule F rates are necessarily reasonable and no refunds  are due.  This contention, however, ignores the heart of the  matter:  the discriminatory effect of Schedule F, which the  Commission resolved by ordering reimbursement of the offending section 2.5 charge.  That an alternative rate exists  that is higher than the Schedule F rate is of no consequence.


18
Finally, Enron contends it should have recovered refunds  not only of the discriminatory third party charges but also of  the difference between each charging border utility's tariff  rate and what it would have been charged had the discounted  intra-MAPP rate been applied to the extra-MAPP transmission.  The Commission, however, provided a simple and reasonable justification for refusing to order a refund of any part  of the border members' tariff rates:  those rates were never  placed at issue in this proceeding.  Enron's complaint did not  challenge their justness and reasonableness.  As a consequence the Commission made no finding they were unjust or  unreasonable and they are not a part of the filing that was  the subject of the proceeding below but are set out in the  individual border members' separately filed tariffs.  See 89  F.E.R.C. at 61, 389.7


19
For the preceding reasons the petitions for review are


20
Denied.



Notes:


1
 Section 2.4 of the filing provided in full:
Additional Use of Rate Schedules:  In addition to the primary purpose of this Tariff, as set forth in Sections 2.1 and 2.2, the Members shall also use the rate schedules appended hereto to compensate Members for third party use of their systems in connection with sales or purchases by Members to or from nonMembers that otherwise meet the requirements of a Coordination Transaction.  Such transactions must be scheduled and arranged by the transacting parties under the Transmission Providers' Open Access Transmission Tariffs or other transmission agreements.
JA 56.  Section 1.7 of Schedule F defines a "Coordination Transaction" as "[a]ny sale for resale of power and/or energy between  Members, for a period not to exceed two years, using existing  generation and transmission facilities."  JA 48.


2
 The pro forma tariff was issued in its final form in "Order  888-A," 62 Fed. Reg. 12,274 (Mar. 14, 1997).


3
 The Policy Statement espoused a "new policy ... designed to  allow much greater transmission pricing flexibility than was allowed  under previous Commission policies."  59 Fed. Reg. at 55,031.  The  Commission announced therein that it would "permit more flexibility to utilities to file innovative pricing proposals that meet the  traditional revenue requirement and will allow such proposals to  become effective 60 days after filing, as long as they satisfy certain  pricing principles" and "the Commission determines that such a  pricing proposal meets the statutory requirements of the [Federal  Power Act], i.e., is just and reasonable and not unduly discriminatory or preferential."  Id. (footnote omitted).  One of the principles  that had to be satisfied was the "comparability standard" "for  judging whether access to transmission services is unduly discriminatory, or anticompetitive."  Id. at 55,034.  Under that standard,  "[a]n open access tariff that is not unduly discriminatory or anticompetitive should offer third parties access on the same or comparable basis, and under the same or comparable terms and conditions, as the transmission provider's uses of its system."  Id.  (footnote omitted;  alteration original).


4
 Meanwhile, MAPP filed, and the Commission approved, a revised Schedule F which, inter alia, eliminated both the border  utility tariff charge and the third party compensation charge and  extended the discounted intra-pool rate to extra-pool transmission. See Mid-Continent Area Power Pool--Order on Compliance Filing,  88 F.E.R.C. p 61,157 (Aug. 2, 1999).


5
 With regard to retroactivity, the MAPP petitioners acknowledge  that "[t]he only question before this Court is whether MAPP  reasonably relied on the September 1996 Order when it restated its  schedule F rates in the Order No. 888 compliance filing."  MAPP  Reply Brief at 7.


6
 The brief discussion of section 2.4 in the April 14, 1999 decision  expressly cites only the 1994 Policy Statement, 87 F.E.R.C. at  61,323, but other passages in the order make clear that the Commission found MAPP's tariff discriminatory under Order 888 as  well, see 87 F.E.R.C. at 61,309-10, 61,074-75.


7
 The Commission also contends now, with some force, that it  lacks authority to order MAPP to refund charges that were collected and retained by third parties, namely the charging border  members. In light of our holding, however, we need not address this  issue and we therefore dismiss as moot MAPP's motion to strike  the portion of Enron's reply brief responding to it.


