Opinion for the court filed by Circuit Judge KAREN LeCRAFT HENDERSON.
The petitioners, a group of hydroelectric utilities licensed under the Federal Power Act (FPA or Act), 16 U.S.C. § 791a et seq., seek review of three orders of the Federal Energy Regulatory Commission (Commission or FERC) that denied them refunds of annual charges that FERC imposed on them pursuant to section 10 of the . FPA. The charges should be refunded, they contend, because FERC inadequately supervises the submission of cost reports by other federal agencies (OFAs) upon which the annual charges are based. They also argue that the charges should be refunded because they are based on costs beyond the scope of those recoverable under the Act.
FERC argues that the court lacks jurisdiction because the orders under review are not final. We conclude that the orders are final and we grant the petition because FERC’s method of assessing the annual charges based on OFAs’ FPA costs conflicts with its obligations under the Act.
I.
A.
When the Congress began to regulate the production of hydroelectric power pursuant to the Federal Water Power Act of 1920 (FWPA), it intended to pass the costs of administration on to the regulated entities. To that end, in addition to authorizing the Federal Power Commission (now FERC) to charge utilities for the use of federal lands or property, the FWPA (now the Federal Power Act) 1 required that li *108 censees “shall pay to the United States reasonable annual charges in an amount to be fixed by the [C]ommission for the purpose of reimbursing the United States for the costs of the administration of this Act.” Federal Water Power Act of 1920, ch. 285, § 10(e), 41 Stat. 1063, 1069 (codified as amended at 16 U.S.C. § 803(e)(1)). 2 Pursuant to this statutory directive, codified in section 10(e) of the FPA, the Commission issued regulations to govern the computation and collection of the fixed charges. 18 C.F.R. pt. 11.
Until 1986, the Commission used this authority to impose charges only to reimburse the Commission for its costs incurred in administering the Act.
City of Idaho Falls,
87 F.E.R.C. ¶ 61,114, 61,469,
In the early 1990s, several hydroelectric licenses were due for relicensing and FERC anticipated a heavy strain on federal and state wildlife agency budgets to complete required studies as part of the relicensing process. H.R.Rep. No. 102-474(1), at 222 (1992), reprinted in 1992 U.S.C.C.A.N. 1954, 2045. The Congress responded to FERC’s concern by amending section 10(e)(1) as part of the 1992 Energy Policy Act (EPAct) to provide that federal and state agencies were to be reimbursed for their work. Id. Section 1701 of the EPAct made the costs recoverable and authorized annual appropriations to cover some of the agencies’ costs. 4
The Commission has established a relatively simple system to assess charges for
*109
FPA administrative costs. For each fiscal year, the Commission solicits from the eight OFAs
5
cost reports of their FPA-related administrative costs for the previous fiscal year. 18 C.F.R. § 11.1(g)(1);
City of Idaho Falls,
93 F.E.R.C. ¶ 61,145, 61,453,
Since the Commission began imposing charges for OFA costs, the charges have sharply increased. In FY 1992, for example, OFAs reported costs totaling $3,858,192; by FY 1999, the total rose to $14,866,849. Brief for Petitioner at 40. Contributing to the escalation has been the OFAs’ expansion of costs sought to be recovered, including overhead, preparation of comments on FERC rulemakings, training and attendance at conferences — as well as costs attendant to certain OFAs’ block grants to Indian tribes to oppose hydroelectric licenses, legal fees and litigation expenses. In 1997, hydroelectric licensees brought a challenge before the Commission on the OFA cost-related charges, complaining that (1) the costs were not based on substantial evidence; (2) there was no mechanism in place to review agency cost submissions to determine whether those costs are reasonable, necessary and within the scope of section 10(e)(1) of the Act; and (3) the Commission impermissi-bly broadened the scope of costs beyond those for the FPA “studies and reviews” specified in section 10(e)(1) of the FPA as amended by the EPAct. Idaho Falls I, 87 F.E.R.C. at 61,470.
B.
The petitioners’ initial challenge appealed fiscal year (FY) 1996 OFA costs includ *110 ed in the FY 1997 annual charges before the Commission’s Chief Financial Officer (CFO). Id. Their objections were in the main rejected by the CFO. Id. FERC postponed review of the CFO’s decision until an administrative law judge (ALJ) concluded his fact-finding regarding the FY 1996 OFA costs. Id. at 61,471. In the meantime, however, the petitioners had filed similar objections to the FY 1997 OFA costs. The Commission then consolidated the two appeals and ordered the ALJ to include in his fact-finding both the FY 1996 and FY 1997 OFA costs. Id. The parties opted to settle the disputed costs before the ALJ. Idaho Falls II, 93 F.E.R.C. at 61,452. On review, FERC declined to approve the settlement, uncertain that the figures contained in the agreement had an adequate factual basis. Id. at 61,455. The Commission did, however, consider the petitioners’ legal issues.
First, the Commission rejected their claim that recoverable costs under the FPA are limited to those specified in the 1992 amendment. Id. at 61,456. Notwithstanding the amendment’s addition of the language “including any reasonable and necessary costs incurred by Federal and State fish and wildlife agencies and other natural and cultural resource agencies in connection with studies or other reviews” to section 10(e)(1), FERC concluded that recoverable costs were not limited to fish, wildlife and other natural and cultural resource agencies nor to costs related to studies and reviews. Id. The only effect of the amendment, the Commission said, was to broaden the scope of recoverable costs from OFAs’ FPA-related administrative costs to “qualifying administrative and study costs of qualifying state resource agencies, whose costs had never before been the subject of Section 10(e).” Id. at 61,456 (emphasis added). Furthermore, the Commission ruled, there was no merit to the petitioners’ claim that section 10(e)(1)’s limit of recoverable costs to those incurred under “FPA Part I” made OFA overhead and litigation costs unrecoverable. Id. at 61,457. According to the Commission, the recovery of those costs was justified because “the administration of FPA Part I ... is inextricably interwoven with the administration of other federal statutes addressing important national resources, statutes that may be triggered by hydroelectric licensing or other action under Part I of the FPA.” Id.
Next, the Commission rejected the petitioners’ argument that the section 10(e)(1) requirement (also found in OBRA § 3401) that annual charges be “reasonable” and “fair and equitable” meant the Commission was obligated to provide a mechanism to review the OFAs’ cost reports for reasonableness and consistency with recoverable costs under the Act. Id. at 61,455. Instead, the Commission said, the language addressed the Commission’s “rate design” responsibility only. Id. at 61,455-56. In fact, FERC said that it “[did] not consider it to be in the ambit of this Commission’s authority to purport to tell another agency what studies or other reviews it should or should not undertake in the exercise of its statutory obligations.” Id. at 61,458. It did announce, however, that thenceforth OFAs were required to certify as true and accurate their cost reports according to federal cost accounting rules. Id. at 61,-456, 61,458. Future cost reports, the Commission said, must comply with the Office of Management and Budget’s Circular A-25 — User Charges and the Federal Accounting Standards Advisory Board’s Material Cost Accounting Concepts and Standards for the Federal Government: Statement of Federal Financial Accounting Standard Number A Id. at 61,456-57. If OFA cost reports were so certified, the Commission then considered them based on substantial evidence and recoverable *111 under section 10(e)(1). Id. at 61,456-58. In the future, challenges to recoverable OFA costs were to be made directly to the agency involved. Id. The Commission also required a complaining hydroelectric utility to lodge a placeholder appeal with the Commission CFO while pursuing its challenge before the agency. Id. Once the agency resolved the challenge, it was to submit a revised cost sheet to the Commission which would make an adjustment (if necessary) in the next annual charge total. Id. at 61,458. If the administrative process did not resolve the matter, the agency was required to file its cost documentation with the Commission for the record on appeal. Id. at 61,458 & n. 44.
FERC, however, did not apply its new “certification” rule retroactively to the FY 1996 and FY 1997 OFA charges that were under challenge. Because those costs had been only partially certified, it again remanded to the ALJ for him to determine which FY 1996 and FY 1997 costs were substantiated. Id. at 61,458-59. While the Idaho Falls II matter was pending, two more years’ worth of charges were assessed against, and paid by, the petitioners and they again challenged the OFA costs, this time for FY 1998 and FY 1999. In its Idaho Falls II order, FERC decided to apply its certification requirement to those appeals and ordered the OFAs to review their submissions for FY 1998 and FY 1999 to ensure that the costs were appropriately certified. It also announced that cost submissions had to be certified within ninety days of the order. Id. at 61,458.
Thus, following
Idaho Falls II,
the petitioners’ challenges to OFA costs in four fiscal years were pending: The FY 1996 and FY 1997 cost challenges were pending before the ALJ and the FY 1998 and FY 1999 cost challenges were pending FERC’s approval of costs certified in accord with the
Idaho Falls II
order. The parties again settled the FY 1996 and FY 1997 costs, the ALJ again certified the settlement and the petitioners again sought FERC approval.
City of Idaho Falls,
95 F.E.R.C. ¶ 61,126, 61,396,
Because the FY 1998 and FY 1999 challenges had not been consolidated with the FY 1996/FY 1997 appeals that were the subject of the settlement, and because the
Idaho Falls III
order failed to indicate which FY 1998/FY 1999 costs were allowed (and disallowed) consistent with the certification requirements of
Idaho Falls II,
the petitioners sought clarification from the Commission and, in the alternative, requested rehearing. Motion for Clarification or, in the Alternative, Request for Rehearing Regarding Appeals of FY 1999 Annual Charges Bills, at 7, 15,
City of Tacoma,
95 F.E.R.C. ¶ 61,465,
In
City of Tacoma,
the Commission clarified its
Idaho Falls III
order, declaring that it did indeed intend in
Idaho Falls III
to resolve the appeals of the FY 1998 and FY 1999 OFA costs.
City of Tacoma,
95 F.E.R.C. ¶ 61,465, 62,672,
The petitioners filed the instant petition on August 27, 2001, seeking review of the Commission’s orders in Idaho Falls II, Idaho Falls III and City of Tacoma and raising the same legal issues they raised in Idaho Falls II & III as well as additional issues ruled upon by the Commission in City of Tacoma. At the same time, the petitioners have separately appealed the Commission’s decision regarding FY 1998 and FY 1999 credits reflected in FY 2001 assessments following City of Tacoma— although in that appeal (which is not before us) they simply make four challenges specific to the FY 1998 and FY 1999 credits. 9
II.
A.
The Commission first challenges our jurisdiction to consider the petition. In doing so, it places great significance on
*113
the fact that it specifically provided in
City of Tacoma
that “Licensees that appealed the OFA FY 1998/FY 1999 costs submittals, may have the opportunity to obtain commission review of any legal, policy, and factual arguments they wish to make with respect to the rulings in [the
Idaho Falls II]
and
[Idaho Falls III]
Orders regarding the OFA FY 1998 costs, ... within the appeal time periods that will pertain for the FY 2001 bills.”
City of Tacoma,
95 F.E.R.C. at 62,672. Because it permitted the petitioners to resurrect their challenges to OFA costs in any FY 2001 appeal, the Commission says, its rulings on issues regarding the FY 1998 costs are not “final” for the purpose of judicial review. Furthermore, the Commission insists, because the petitioners have in fact appealed the FY 1998 costs adjustments included in the FY 2001 assessments, their petition is incurably premature because they cannot simultaneously seek both agency reconsideration and judicial review of the same FERC order.
See Tenn. Gas Pipeline Co. v. FERC,
We reject the Commission’s challenge to this court’s jurisdiction.
See
5 U.S.C. § 704; 16 U.S.C. § 825Z(b);
Papago Tribal Util. Auth. v. FERC,
*114 B.
The petitioners argue that the Commission has misconstrued the scope of recoverable costs under section 10(e)(1) because both the structure and the text of section 1701(a) manifest that the only recoverable OFA costs thereunder are those “reasonable and necessary” costs for “studies and other reviews” by OFAs. They contend that the Commission wrongly relies on section 3401 of OBRA to broaden the scope of recoverable costs under the FPA and challenge the Commission’s denial of FY 1998 OFA cost refunds based only on OFAs’ certifications. They also complain that the Commission erroneously denied them refunds from the costs the OFAs added upon recertification following Idaho Falls II. Because we grant the petitioners’ petition on another ground, however, we leave the resolution of those claims to the Commission on remand. 11
The petitioners’ primary argument is that FERC failed to meet the mandate of section 10(e)(1) of the FPA in not determining whether the OFAs’ reported costs were reasonable and necessary within the scope of section 10(e)(1). To determine whether FERC has acted, as the petitioners contend, contrary to law “we look first to determine whether Congress has delegated to the agency the legal authority to take the action that is under dispute.”
Atlantic City Elec. Co. v. FERC,
As we have previously held, the authority to assess charges under section 10(e)(1) of the FPA is FERC’s exclusive responsibility.
E. Columbia Basin Irrigation Dist. v. FERC,
Although the Commission responds that the “reasonableness” command of section 10(e)(1) references only its “rate design” responsibility, i.e., the statute requires the Commission to ensure only that a reasonable methodology to assess annual charges is established, FERC fails to explain its rationale for interpreting section 10(e)(1) to mean that it has no duty to review the costs itself. Its failure is understandable given that its construction of section 10(e)(1) conflicts with its construction of other provisions of the Act. For example, section 30(e) of the FPA, which relates to fish and wildlife agencies’ cost recovery incurred in connection with hydroelectric exemption applications for small conduit facilities, directs that the “Commission ... shall establish fees ... adequate to reimburse the fish and wildlife agencies ... for any reasonable costs incurred in connection with any studies or other reviews carried out by such agencies for purposes of compliance with this section.” 16 U.S.C. § 823a(e) (emphasis added). Notwithstanding, the Commission interprets the language differently:
Since the Commission is responsible for establishing fees to reimburse “reasonable costs,” it necessarily has the authority to determine whether the costs submitted by agencies are reasonable. The Commission has a statutory obligation ... to ensure that agencies are not unreasonable in making their cost statements and study requirements under FPA section 30(c).
Fees for Hydroelectric Project Applications to Reimburse Fish and Wildlife Agencies, 52 Fed. Reg. 48,398, 48,402 (Dec. 22, 1987). The Commission’s failure to interpret consistently two statutory provisions that are
in pari materia
manifests that it has not correctly read “the language and design of the statute as a whole.”
Halverson,
For the foregoing reasons, we vacate the orders under review, namely,
Idaho Falls II,
93 F.E.R.C. ¶ 61,145,
So ordered.
Notes
. In 1935, most of the FWPA became Part I of the Federal Power Act of Aug. 26, 1935, ch. 687, §§ 212, 213, 49 Stat. 803, 847, 863.
. The Act also requires a licensee to "recompense the Government for the use, occupancy, and enjoyment of its lands or other property” and to pay charges if the licensee uses "Government dams or other structures owned by the United States.” 16 U.S.C. § 803(e)(1). Thus, the Commission imposes three types of annual charges on regulated hydroelectric utilities: first, the charges at issue here, which are intended to reimburse the government for administering Part I of the Act; second, charges for the use of public land; and third, charges for the use of dams or other structures owned by the United States.
Id.;
18 C.F.R. §§ 11.1—.4;
City of Vanceburg, Ky. v. FERC,
. Idaho Falls I, 87 F.E.R.C. at 61,469 n.6 (quoting Report on Accounts Receivable, Billings and Collections of the Federal Energy Regulatory Commission, U.S. Department of Energy, Office of the Inspector General, Report No. DOE/IE-0224 (Feb. 3, 1986));- Revision of the Billing Procedures for Annual Charges for Administering Part I of the Federal Power Act, 52 Fed.Reg. 18,201, 18,207 (May 14, 1987).
. Section 1701(a)(1) amended section 10(e) to read:
the licensee shall pay to the United States reasonable annual charges in an amount to be fixed by the Commission for the purpose *109 of reimbursing the United States for the costs of the administration of this subchap-ter, including any reasonable and necessary costs incurred by Federal and State fish and wildlife agencies and other natural and cultural resource agencies in connection with studies or other reviews carried out by such agencies for pwposes of administering their responsibilities under this subchapter....
Energy Policy Act of 1992, Pub.L. No. 102-486, § 1701(a), 106 Stat. 2776, 3008 (codified at 16 U.S.C. § 803(e)(1)) (amendment emphasized). Section 1701(a)(2) added this proviso:
Provided, That, subject to annual appropriations acts, the portion of such annual charges imposed by the Commission under this subsection to cover the reasonable and necessary costs of such agencies shall be available to such agencies (in addition to other funds appropriated for such purposes) solely for carrying out such studies and reviews and shall remain available until expended....
Id.
. The eight agencies are the Bureau of Indian Affairs, the Bureau of Land Management, the Bureau of Reclamation, the U.S. Fish and Wildlife Service, the Army Corps of Engineers, the U.S. Forest Service, the National Oceanographic and Atmospheric Administration and the Environmental Protection Agency.
City of Idaho Falls,
93 F.E.R.C. ¶ 61,145, 61,453,
. The charges attributed to the Commission's administrative costs reflect anticipated costs for the current fiscal year. 18 C.F.R. § 11.1(g)(1). At the end of the year, the Commission compares the estimated costs with its actual costs and in the subsequent fiscal year’s bill, includes a “true-up" of charges due. Id.
. Utilities that operate small conduit hydroelectric facilities and small hydroelectric projects that have more than 1.5 megawatts of installed capacity, both of which are exempt from the license requirements of the Act, 18 C.F.R. §§ 4.90-96; 18 C.F.R. §§ 4.101-.108, also pay a share of FPA administrative costs. 18 C.F.R. § 11.1(c)—(h).
. The petitioners focused on the FY 1998 costs at issue here, but they also requested that their motion be considered with other petitioners' appeals of both FY 1998 and FY 1999 OFA costs. Idaho Falls III Motion for Clarification, at 7-8.
. That appeal maintains that (1) the FERC accounting staff failed to execute the City of Tacoma order because it allowed costs the Commission indicated were not recoverable; (2) the FERC staff failed to issue a refund to a licensee that, they allege, timely appealed FY 1998/FY 1999 costs; (3) credit is due them for two OFAs' cost reports because the OFAs failed to provide documentation supporting the submitted costs; and (4) credit is due them for costs the OFAs did not properly attribute to municipal and nonmunicipal projects as required by FERC rule. See generally Appeal of Credits Contained in FY 2001 Annual Charges Bills Attributable to Other Federal Agencies’ FY 1998 and FY 1999 Costs and Motion for Waiver of Regulations and for Expedited Action, FERC Proj. No. 4881, Sept. 4, 2001 (petitioners' FY 2001 Charges Appeal).
. We also reject the Commission’s contention that the FY 2001 appeal now before the Commission is a request for a rehearing of City of Tacoma or the other two orders under review and therefore is premature. That appeal challenges FY 2001 assessments, supra n. *114 9, and, although they, contain FY 1998 OFA cost adjustments, the appeal does not relate to the orders considered by the Commission in Idaho Falls II & III and City of Tacoma—those orders involved FY 1999/FY 2000 assessments (FY 1998/FY 1999 OFA costs).
. We note, however, our skepticism of the petitioners’ assertion that the Congress, when it amended section 10(e) to add "including any reasonable and necessary costs incurred by Federal and State fish and wildlife agencies and other natural and cultural resource agencies in connection with studies or other reviews carried out by such agencies,” intended to limit recoverable costs to those related only to "studies and other reviews.” The use of the word "including” itself indicates that the enumerated costs are not the sole recoverable costs.
Phelps Dodge Corp. v. NLRB,
