This appeal concerns the constitutionality of an Oklahoma law, Senate Bill 160 (“SB 160”), that amended Oklahoma statutory obligations owed by purchasers and producers of oil and natural gas to owners of royalty interests. SB 160 became effective in 1985 and remained so until July 1, 1993, when it was effectively repealed and replaced by legislation that is not challenged by these parties. The district court, exercising jurisdiction under 28 U.S.C. § 1331, ruled, on summary judgment, that SB 160 violated the Supremacy Clause, the Contracts Clause, and the Fourteenth Amendment.
Background
The Appellee pipeline companies (“Purchasers”) are natural gas companies and interstate pipelines, as defined by the Natural Gas Act, 15 U.S.C. § 717a(6) and the Natural Gas Policy Act, 15 U.S.C. § 3301(15).
Until 1985, Oklahoma statutory law imposed the following obligation on oil and gas producers:
In the event a producing well or wells are completed upon a unit where there are ... two or more separately owned tracts, any royalty owner holding the royalty interest [in a tract in the unit] shall share in the one-eighth (1/8) of all production from the well or wells drilled within the unit ... in the proportion that the acreage of their separately owned tract or interest bears to the entire acreage of the unit; provided, where a lease covering any such separately owned tract or interest included within a spacing unit stipulates a royalty in excess of one-eighth (1/8) of the production ... then the lessee of said lease out of his share of the working interests ... shall sustain and pay said excess royalty....
Okla. Stat. tit. 52, § 87.1(e) (Supp.1984). In 1963, the Oklahoma Supreme Court interpreted this provision to mean that a royalty owner whose own lessee is not selling gas is nonetheless entitled to a proportionate share of the statutory one-eighth royalty from all production in the unit. Accordingly, the court held that when a well is producing from a drilling and spacing unit established under the Oklahoma Corporation Commission, each producer-lessee selling production from a well must account to all royalty owners in the unit (as opposed to only its own lessor) for the owners’ proportionate shares of the statutory one-eighth royalty share of production proceeds. Shell Oil Co. v. Corporation Comm’n,
The duties of oil and gas purchasers were not at issue in the Blanchard ease. These Purchasers, pursuant to most of their oil and gas contracts, were obligated to pay the full sales price to producers, who in turn were independently responsible for royalty payments and any other obligations due under the oil and gas leases between lessee-producers and lessor-owners.
During the early 1980s there was an oversupply of natural gas. As a result, royalty owners experienced difficulty in obtaining their royalty payments. The Oklahoma Legislature responded by enacting Senate Bill 160 (“SB 160”) in 1985, amending two existing statutes to provide greater rights to royalty owners. Okla. Stat. tit. 52, § 87.1(e) was amended to provide in relevant part:
In the event a producing well or wells are completed upon a unit where there are ... two or more separately owned tracts, the first purchaser or purchasers shall he liable to any royalty owner ... holding the royalty interest under a separately owned tract included in such drilling and spacing unit for the payment of proceeds from the sale of production from the drilling and spacing unit. Each royalty interest owner shall share in all production from the well or wells drilled within the unit ... to*1223 the extent of such royalty interest owner’s interest in the unit. Each royalty interest owner’s interest in the unit shall be defined as the percentage of royalty, including the normal one-eighth (1/8) royalty, overriding royalties or other excess royalties owned in each separate tract by the royalty owner, multiplied by the proportion that the acreage [owned] bears to the entire acreage of the unit. The first purchaser or purchasers shall also■ be jointly and severally liable for the payment to each royalty interest owner of any production payments or other obligations for the payment of monies contained within the leases covering any lands lying within the drilling and spacing unit. Nothing in this act shall relieve a lessee or his assignees from any obligations imposed by the lease.
(Supp.1985) (emphasized language added by SB 160).
Also challenged is SB 160’s amendment of Okla. Stat. tit. 52, § 540. The challenged portion of that statute read:
B. Any said first purchasers or owner of the right to drill and produce substituted for the first purchaser as provided herein that violates this act shall be hable to the persons legally entitled to the proceeds from production for the unpaid amount of such proceeds with interest thereon at the rate of twelve percent (12%) per annum, calculated from date of first sale.
(Supp.1985) (emphasized language added by SB 160).
The legislation thus amended existing law in several significant ways. First, it amended the previous method under which a royalty owner’s interest in a spacing or drilling unit was determined. Whereas the previous statute, as construed in the Blanchard case, provided that royalty owners in a unit would share in one-eighth of all production from the unit, the amended statute provides that each royalty owner shares in all production in the unit, to the extent of his “ ‘royalty owner’s interest in the unit.’ ” Okla. Att’y Gen. Op. No. 88-76 (Jan. 13, 1989). The statute expressly defines “royalty owner’s interest” to include both “the normal 1/8 royalty” and other royalties such as overriding royalties or other excess royalties negotiated by the royalty owner. Because there was a lack of information as to the royalties owed to the owners, this change substantially affected parties’ rights and obligations when not all owners were selling proportionally from the well or wells draining their unit. Second, SB 160 clearly placed responsibility for royalty payments on the first purchaser and did not provide an opportunity for the purchasers to contract away that obligation.
There appears to have been little compliance with SB 160 within the natural gas industry. Neither Producers nor Purchasers allege either compliance with SB 160 or any attempt by the state to enforce SB 160 against them. In April 1992, the Oklahoma Legislature enacted Senate Bill 168 (“SB 168”), the Production Revenue Standards Act, which repealed and replaced the contested SB 160 amendments and created new procedures for the payment of royalty obligations. Portions of SB 168 became effective in September 1992, while the remainder became effective July 1, 1993. The parties appear to agree that SB 168 is constitutional. Producers have no dispute with SB 168, as it allows producers disadvantaged by its royalty payment provisions to offset any loss by producing a correspondingly greater volume of gas than they would otherwise be entitled to produce. Purchasers agree that SB 168 remedied the constitutional defects of SB 160, because SB 168 explicitly provides that a purchaser who pays its contracted producer for gas taken is thereafter liable to no other parties. Thus, the determination whether SB 160 was constitutional affects the rights and liabilities of these parties for the period 1985 to 1993 only.
Following a lengthy period during which the federal action was suspended in the ulti
I. Preemption
We turn first to the district court’s determination that SB 160 is preempted by federal law. As this is a conclusion of law, our review is de novo. Estate of Holl v. Commissioner,
Determining whether Congress has exercised its power under this clause to preempt state law requires an examination of congressional intent. Northwest Cent. Pipeline v. Kansas Corp. Comm’n,
In the absence of explicit statutory language signaling an intent to pre-empt, we infer such intent where Congress has legislated comprehensively to occupy an entire field of regulation, leaving no room for the states to supplement federal law, or where the state law at issue conflicts with federal law, either because it is impossible to comply with both or because the state law stands as an obstacle to the accomplishment and execution of congressional objectives.
Id. (citations omitted).
The district court found that SB 160 is preempted by the Natural Gas Act (“NGA”), 15 U.S.C. § 717, et seq., as amended by the Natural Gas Policy Act (“NGPA”), 15 U.S.C. § 3301, et seq.
The NGA was enacted in 1938, after a series of Commerce Clause cases striking down state laws “left the states powerless to regulate interstate transportation and wholesales” of natural gas. Cascade Natural Gas Corp. v. FERC,
The provisions of this chapter shall apply to the transportation of natural gas in interstate commerce, to the sale in interstate commerce of natural gas for resale for ultimate public consumption for domestic, commercial, industrial, or any other use, and to natural gas companies engaged in such transportation or sale, but shall not apply to any other transportation or sale of natural gas or to the local distribution of natural gas or to the facilities used for such distribution or to the production or gathering of natural gas.
The scope of the reservation to the states of the regulation of “production or gathering” inevitably became the subject of litigation. In Northern Natural Gas Co. v. Kansas Corp. Comm’n,
unmistakably and unambiguously directed at purchasers who take gas in Kansas for resale after transportation in interstate commerce. In effect, these orders shift to the shoulders of interstate purchasers the burden of performing the complex task of balancing the output of thousands of natural gas wells within the State.
Id. at 92,
By the 1970s, it became clear that the NGA’s regulatory structure was inadequate. “The federally regulated prices for interstate gas sales remained consistently below the unregulated prices for intrastate gas sales. Natural gas producers found it more profitable to commit most of their supplies to the intrastate market [while] consumer demand for gas in the interstate market was artificially high_” Martin Exploration Management Co. v. FERC,
Northern Natural’s finding of pre-emption ... rests on two considerations. First, Congress had created a comprehensive regulatory scheme, and ratable-take orders fell within the limits of that scheme rather than within the category of regulatory questions reserved for the States. Second, in the absence of ratable-take requirements, purchasers would choose a different, and presumably less costly, purchasing pattern. By requiring pipelines to follow the more costly pattern, Kansas’ order conflicted with the federal interest in protecting consumers by ensuring low prices.
Id. at 420,
More recently, the Supreme Court distinguished these cases to uphold a state regulation governing the timing of production of natural gas. In Northwest Cent. Pipeline v. Kansas Corp. Comm’n,
In sum, as we have stated, “all state regulation of the purchasing or taking of natural gas by interstate pipeline companies has been pre-empted by the federal regulations contained in the Natural Gas Act and the Natural Gas Policy Act of 1978....
Mineral Owners urge that SB 160 falls within the “category of regulatory questions reserved for the states which include measures designed to protect the correlative rights of owners of interests in oil and gas.” Br. of Appellant at 30. They contend that SB 160 is a regulation concerning the royalty owners’ rights to payment under their lease agreements, and therefore does not interfere with federal regulation of interstate purchasers. We cannot agree. “[Exceptions to the primary grant of jurisdiction in [section 1(b) ] are to be strictly construed.” Phillips Petroleum, Co. v. Wisconsin,
Under SB 160, interstate pipelines purchasing natural gas are ultimately responsible for ensuring that all royalty owners within a drilling and spacing unit receive their royalty payments. Just as the ratable take orders in Northern Natural “shifted] to the shoulders of interstate purchasers the burden of performing the complex task of balancing the output of thousands of natural gas wells within the State,”
Finally, as Appellants themselves pointed out to the district court, SB 160 “transferís] the burden of the risk of the insolvency of lessees from the royalty owners to the ... Purchasers.” Appellants’ App., Yol. II, at 476. In addition to forcing the purchasers to assume the task of bookkeeping for an oil and gas unit, SB 160 imposes on purchasers joint and several liability for payments owed to all royalty interest owners in the unit. A purchaser’s liability is not limited to the payments owed under its own contracts with producers, nor, indeed, is it limited to payments owed to those holding royalty interests in the gas or oil purchased under its own contracts. Rather, SB 160 holds purchasers ultimately Hable for payment to “any royalty owner” in a unit, including payment of royalties for gas and oil purchased by other purchasers within the unit and other lessor-lessee money obhgations entirely unrelated to the purchase of gas and oil.
For these reasons, we also reject Appellants’ alternative argument that “[i]f SB 160 is preempted because it increases the costs of the purchasers, any state requirements placed on purchasers would likewise be preempted” and the “purchasers could avoid all state regulation.” Reply Br. of Appellants at 17. It is indisputable that “every state statute that has some indirect effect on [areas within federal control] is not preempted.” Schneidewind v. ANR Pipeline Co.,
II. SeverabiHty
Having concluded that SB 160 is preempted insofar as it burdens interstate pipeline companies engaging in the purchase of natural gas, we must determine whether the portion of the statute which we find invaHd may be severed from the remainder of the statute. The severabiHty of a statute is an issue of state law. Jane L. v. Bangerter,
2. For acts enacted prior to July 1, 1989, whether or not such acts were enacted*1230 with an express provision for severability, it is the intent of the Oklahoma Legislature that the act or any portion of the act or application of the act shall be severable unless:
* * *
b. the court finds the valid provisions of the act are so essentially and inseparably connected with and so dependent upon the void provisions that the court cannot presume the Legislature would have enacted the remaining valid provisions without the void one....
Our preemption analysis voids only the portions of SB 160 imposing liability on first purchasers, and only when those first purchasers are interstate pipelines engaged in the purchase of natural gas for resale in interstate commerce. We thus must determine whether these portions of the act are “so essentially and inseparably connected with and so dependent upon” the liability of interstate gas purchasers that we cannot presume the Legislature would have enacted these provisions without such liability.
The purpose of SB 160 was to facilitate the payment of royalties to entitled royalty interest owners. The legislation did not merely recalculate the royalty interest due but unambiguously imposed liability for the payment of this interest on a single, identifiable party: the first purchaser. That the Legislature intended SB 160 to be a mechanism to enlist purchasers as insurers of the contemplated royalty payments is made clear by the repetition throughout the legislation of provisions placing liability on purchasers. In light of this clear legislative intent,
That the Legislature would have enacted only the non-preempted portions of SB 160 appears further unlikely in light of the legislation that in fact repealed and replaced SB 160. Senate Bill 168, the Production Revenue Standards Act, accomplishes the same purposes as SB 160, but explicitly provides that “[n]othing in the Production Revenue Standards Act shall: ... Set the price, terms or conditions under which a purchaser takes the production or set any restrictions, limitations, floor or ceiling on the price to be paid for such production.” Okla. Stat. tit. 52, § 570.9(E)(3) (Supp.1996). In removing the burden of royalty payments from first purchasers, the Legislature did not retain the royalty calculation challenged in SB 160. Rather, SB 168 contains a careful and complex scheme whereby each producer pays the “royalty share” out of the proceeds received from its sales of gas production, see Olda. Stat. tit. 52, § 570.4(B), and is reimbursed for any excess royalty burden by being permitted to produce and separately dispose of
Conclusion
Because we find that portions of SB 160 are preempted, and we cannot presume that the Oklahoma Legislature would have enacted the non-preempted language standing alone, we hold that the statute is invalid in its entirety. We therefore do not reach the remaining issues on appeal: namely, whether the Legislature intended SB 160 to apply to existing contracts, or whether SB 160 violates the Commerce Clause, the Contracts Clause, or the Fourteenth Amendment. The judgment of the district court is AFFIRMED.
Notes
. It may be that the district court also held that SB 160 violated the Commerce Clause, as the parties seem to assume. However, such a ruling cannot be found in either the court’s July 1994 order or judgment or in its June 1995 modified judgment. In any event, because we agree that SB 160 is unconstitutional under the Supremacy Clause, we do not reach either the Commerce Clause issues or the other constitutional challenges.
. The exception is Public Service Company of Oklahoma, which is concededly not an interstate pipeline company as defined by the Natural Gas Act and Natural Gas Policy Act. Accordingly, Public Service Company did not raise the preemption or Commerce Clause claims raised by the remaining Purchasers.
. Although both district judges to consider this case stated that this fact was not in dispute, Mineral Owners claim that this fact was disputed below. They point out that this was listed as a “disputed fact" in the parties' Joint Status Report of June 9, 1993. However, we find nothing in the record to support this characterization. As we note infra, while non-appealing party CLO did offer an affidavit that under some contracts Purchasers remit royalties directly to royalty owners, no evidence appears to have been offered to controvert affidavits by Purchasers that under the majority of their gas purchase contracts there was no direct liability from the Purchasers to the Royalty Owners.
. A preexisting statute, enacted in 1980, did impose royalty obligations on first purchasers, although it allowed them to transfer those obligations to the producers. Okla. Stat. tit. 52, § 540 provided in relevant part:
A. The proceeds derived from the sale of oil or gas production from any oil or gas well shall be paid to persons legally entitled thereto.... Such payment is to be made to persons entitled thereto by the first purchaser of such production.... The first purchaser shall be exempt from the provisions of this subsection and the owner of the right to drill and to produce under an oil and gas lease ... shall be substituted for the first purchaser therein where the owner and purchaser have entered into arrangements where the proceeds are paid by the purchaser to the owner who assumes the responsibility of paying the proceeds to persons legally entitled thereto.
(Supp.1981-82). Section 540, which has been amended and recodified as Okla. Stat. tit. 52, § 570.10, is not at issue in this appeal except insofar as it was amended by SB 160. We therefore do not address its constitutionality. We note, however, that SB 160 places significant additional burdens on first purchasers heyond those imposed by Section 540 before the amendment. First, under SB 160, a purchaser remains liable to royalty owners regardless of whether it has contracted with a producer for the producer to assume such liability. Indeed, a purchaser is liable for all royalty payments even though it may have no contractual relationship whatsoever with some owners and producers within the unit. Similarly, because legal liability remains with the purchaser at all times, it is the purchaser’s burdensome responsibility to ascertain the identities and interests of all royalty owners in a unit and to ensure that those royalty owners get paid. Further, to the extent that SB 160 amends the calculation of royalties owed to royalty owners to include royalties in addition to the “normal 1/8,” it is purchasers who are required to make these complex calculations and to ensure the proper distribution of these royalty payments. Finally, each purchaser is made jointly and severally liable with each other purchaser in the unit so that each purchaser is required not only to make its own payments correctly but is also required to
Mineral Owners note that while SB 160 was in effect, Section 540 provided that first purchasers could escape liability for royalty payments by contracting with producers to assume this responsibility. They argue that ‘‘[n]othing in SB 160 precludes the purchasers from entering into such agreements." Br. of Appellants at 37. However, Section 540 provided only that a purchaser who so contracts "shall be exempt from the provisions of this subsection;” it did not address a purchaser's liability trader section 87.1 as amended by SB 160. Further, we find section 87.1's imposition on first purchasers of joint and several liability for royalty payments to be inconsistent with a legislative intent to allow parties to contract around its provisions.
. Appellant OMOA suggested before the district court (and suggests here) that SB 160 and SB 168 do not conflict, and that compliance with SB 168 satisfies SB 160. They therefore suggest that the alleged constitutional deficiencies of SB 160 can be eliminated by reading the statutes together. While SB 168 is retroactive in that it applies to all contracts and wells as of its effective date, see Okla. Stat. tit. 52, § 570.3 (Supp.1996), it does not purport to reach back and cover the period between 1985-1993. Nor may SB 160 reasonably be "construed” to include the language in SB 168 that cured the alleged constitutional defects: an explicit scheme for compensating producers, and explicit language relieving purchasers of liability.
. The district court found preemption on two grounds: (1) the challenged statutes would force interstate pipelines to "comply with varied state regulations of their purchasing practices, thus disrupting the federal scheme”; and compliance by interstate pipelines with the challenged statutes "would have the effect of increasing the ultimate price to consumers which frustrates the federal goal of insuring low prices." Order of Judge Cauthron, Appellant App., Vol. Ill, at 846.
. We find misplaced, therefore. Mineral Owners' reliance on Mobil Oil Corp. v. FPC,
. Mineral Owners protest that whether SB 160 imposes costs on Purchasers is a disputed issue of material fact precluding summary judgment. They rely on affidavits submitted by non-appealing defendant CLO in objection to plaintiff's motions for summary judgment. In 1987, CLO submitted an affidavit averring that plaintiff Purchasers currently remitted to the CLO its royalty interest on 68 leases. In 1993, CLO submitted affidavits contesting the substance of an affidavit in support of plaintiff’s supplemental brief for summary judgment. In these, CLO contested Purchasers’ construction of their contracts and also offered its own calculation of how much it would cost Purchasers to remit royalties: the affiant concluded “the up front costs are less than $20,000 and the monthly fees should be less than $1,500 a month.”
Mineral Owners themselves did not assert that summaiy judgment was inappropriate because of the existence of disputed facts, nor did they "set forth specific facts showing that there is a genuine issue for trial.” Applied Genetics Int’l, Inc. v. First Affiliated Secs., Inc.,
. While we believe the legislative intent is clear from the face of the statute, our conclusion draws further support from the Senate Debate on SB 160. See, e.g., Statement of Senator Giles, Senate Debate on Senate Bill 160, May 30, 1985, at 24:
[I]f you did not have the [language making purchasers liable], you would still have the operator paying part of the proceeds to the royalty owners, and the lessee paying other parts and so forth under existing contracts and existing law. So you’ve got to have both [the royalty calculation and the liability provisions] to make the overall problem be cured, basically. Otherwise, there is no one individual or no one entity that's responsible for payment, and the royalty owner is still going to be where he is today and looking to different parties for payment of different prices.
(Producers’ Supp.App. at 27).
. Although SB 160 benefits royally owners under both oil and gas leases, the parties agree that the problem SB 160 was enacted to solve arose primarily because of disproportionate production of natural gas. See, e.g., Br. of Appellants at 10 ("During the early 1980s, many working interest owners were unable to sell their share of gas produced from a unit well and many mineral owners did not receive payment.”); Br. of Purchasers at 5 n.2 (”[I]t may be that there has been less effort to enforce [SB 160] when there has been proportionate production, as there generally is in the production of crude oil, and less frequently in the context of gas.”). Thus, even assuming SB 160 were valid as to purchasers of off, or purchasers of oil and only intrastate purchasers of natural gas, we have no confidence that the Legislature would have chosen to enact such a version of the legislation. Thus, we must declare SB 160 void in its entirely.
. Appellant Mineral Owners have requested that we certify several questions to the Oklahoma Supreme Court pursuant to Okla. Stat. tit. 20, § 1602 (Supp.1996) (that court may answer a question of law certified by a United States Court of Appeals "if there are involved in any proceeding before [the certifying court] questions of law of this state which may be determinative of the cause then pending ... as to which it appears to the certifying court there is no controlling precedent in the decisions of the Supreme Court or Court of Criminal Appeals of this state"). None of the questions specified are determinative of the issue of preemption. Nor do we believe that the Oklahoma Supreme Court could construe the challenged provisions of SB 160 in such a way as to avoid their being preempted by federal law. We therefore deny the motion for certification.
