
531 F.3d 183 (2008)
WHEELABRATOR LISBON, INC., Plaintiff-Appellant,
Wheelabrator Technologies, Inc. and Minnesota Methane LLC., Plaintiffs,
v.
State of CONNECTICUT DEPARTMENT OF PUBLIC UTILITY CONTROL, Donald W. Downes, Jack R. Goldberg, John W. Betkoski III, Linda J. Kelly, and Anne C. George, Commissioners of the State of Connecticut Department of Public Utility Control,[1] Defendants-Appellees,
The Connecticut Light and Power Company, Intervenor-Defendant-Appellee.
Docket No. 06-3632-cv.
United States Court of Appeals, Second Circuit.
Argued: January 15, 2008.
Decided: June 25, 2008.
*184 Vincenzo Franco, (Margaret A. Moore, Howard E. Shapiro, on the brief), Van Ness Feldman, P.C., Washington, D.C., for Plaintiff-Appellant.
Tatiana D. Eirmann, Assistant Attorney General, (Richard Blumenthal, Attorney General, on the brief), Office of the Attorney General, State of Connecticut, New Britain, CT, for Defendants-Appellees.
Philip M. Small, (Khristopher M. Gregoire, on the brief), Brown Rudnick Berlack Israels LLP, Hartford, CT, for Intervenor-Defendant-Appellee Connecticut Light and Power Company.
Before: KEARSE, LEVAL, and CABRANES, Circuit Judges.
PER CURIAM:
Plaintiff Wheelabrator Lisbon, Inc. challenges a decision of defendant State of Connecticut Department of Public Utility Control ("DPUC")[2] concerning an Electricity Purchase Agreement ("Agreement") for the sale of wholesale electricity between Wheelabrator[3] and intervenor Connecticut Light and Power Company ("CL & P"). The principal dispute concerns the ownership of the renewable energy attributes of the energy conveyed in the Agreement. Wheelabrator argues that a 2004 decision of the DPUC modified the terms of the Agreement and thereby imposed utility-type regulation in conflict with Section 210(e) of the Public Utility Regulatory Policies Act of 1978 ("PURPA"), 16 U.S.C. § 824a-3(e); Section 210(e)'s implementing *185 regulations; and the interpretation of PURPA by the Federal Energy Regulatory Commission ("FERC") in American Ref-Fuel Company, 105 FERC ¶ 61,004 (2003). We agree with the District Court that the DPUC's decision is not preempted by federal law and therefore affirm the June 28, 2006 judgment of the District Court.

BACKGROUND[4]
Wheelabrator is a renewable energy producer, which generates electricity by burning refuse. It operates a small waste-to-energy power production facility in Lisbon, Connecticut and, pursuant to the Agreement, sells all of the energy produced at its Lisbon facility to CL & P.

A. Legal and Regulatory Framework Governing Renewable Energy Producers
PURPA was enacted to (1) encourage the development of "cogeneration" and "small power production facilities" in order to "reduc[e] the nation's reliance on oil and gas" and (2) promote renewable energy sources "to combat a nationwide energy crisis."[5]Niagara Mohawk Power Corp. v. FERC, 306 F.3d 1264, 1266 (2d Cir.2002) (internal quotation marks omitted). To stimulate demand for energy sources other than fossil fuels, Section 210 of PURPA requires electric utilities to purchase electricity from qualifying cogeneration or "small power production facilities," like the one operated by Wheelabrator.[6]See FERC v. Mississippi, 456 U.S. 742, 750, 102 S.Ct. 2126, 72 L.Ed.2d 532 (1982); 16 U.S.C. § 824a-3(a)(2). PURPA section 210(e) also exempts qualifying facilities from certain federal and state utility regulation, including the regulation of utility rates ("utility-type regulation").[7] 16 U.S.C. § 824a-3(e). The parties agree that an agency's modification of a power purchase agreementfor example, by changing the agreed-upon ratesconstitutes *186 an impermissible utility-type regulation. See Freehold Cogeneration Assocs., L.P. v. Bd. of Reg. Comm'rs of State of N.J., 44 F.3d 1178, 1192 (3d Cir.1995) (holding that an order of a state regulatory agency requiring the renegotiation of rate for energy modified the terms of a purchase agreement in violation of PURPA section 210(e)).
PURPA further provides for state implementation of its requirements, 16 U.S.C. § 824a-3(f). To that end, Connecticut enacted Connecticut General Statutes § 16-243a et seq., which requires utilities such as CL & P to enter into contracts to purchase the "electrical energy and capacity" of qualifying facilities.[8] As the relevant state utilities regulatory agency, the DPUC must implement the rules prescribed by PURPA. See 16 U.S.C. § 824a-3(f)(1). Pursuant to this requirement, the DPUC issued regulations setting forth a bid and contracting process for electrical utilities to acquire electrical energy and capacity from qualifying facilities. See Conn. Agencies Regs. § 16-243a-5, a-7.

B. The Wheelabrator Agreement
In 1991, Wheelabrator and CL & P entered into the Agreement, which provided for CL & P to purchase the "entire net electric output" of the Lisbon facility at rates set forth in the Agreement. See 1991 DPUC Decision. The DPUC approved the terms of the Agreement and ordered CL & P to adopt it. See id. The energy conveyed in the Agreement possesses certain renewable energy attributes that, since the signing of the Agreement, have become independently tradeable commodities known as "renewable energy credits" ("RECs"). The parties now dispute the ownership of these RECs.
RECs are "tradeable certificates ... that correspond to a certain amount of renewable energy generated by a third party." American Ref-Fuel, 105 FERC at 61,005. Generally speaking, RECs are inventions of state property law whereby the renewable energy attributes are "unbundled" from the energy itself and sold separately. The credits can be purchased by companies and individuals to offset use of energy generated from traditional fossil fuel resources or by government agencies to satisfy certain requirements that these agencies purchase a certain percentage of their energy from renewable sources. In 2002, the specific credits at issue here became marketable by the creation of a market for such credits pursuant to the laws of several states, including Connecticut. Connecticut General Statutes Section 16-245a, legislation adopted that year, requires electricity suppliers to use electricity purchased from renewable sources, for instance by purchasing Generation Information System ("GIS") Certificates.[9]
The District Court, in a finding that is not disputed, determined that "[a]t the time that [the Wheelabrator Agreement was] approved and executed, no intangible property in the form of GIS Certificates existed in Connecticut as a separate tradable commodity. Thus, the [Agreement does] not mention the transfer of GIS Certificates *187 or RECs." Wheelabrator I, 526 F.Supp.2d at 298-99.

C. The 2004 DPUC Decision on the Ownership of Wheelabrator's RECs
In 2004, the parties petitioned the DPUC for a decision as to whether the terms of the Agreement conveyed the renewable energy credits to CL & P. The DPUC found that the Agreement conveyed to CL & P any RECs arising from Wheelabrator's production of the electricity at the Lisbon facility. See 2004 DPUC Decision. In doing so, it looked to, inter alia, the fact that the Agreement: (1) conveyed "the entire net electrical output of the facility," a term that the DPUC construed to convey the renewable energy attributes of the electricityincluding the RECsas well as the electricity itself; (2) contemplated that the energy sold would be renewable energy, thereby suggesting that the parties intended to convey the renewable attributes along with the energy; and (3) granted Wheelabrator certain exemptions from state regulation as well as favorable contract terms that compensated Wheelabrator for the renewable energy attributes of the electricity, such as the RECs. Id. at *16-24. Based on these observations, the DPUC concluded that the electricity "cannot be separated from the fuel used to generate it" and the "renewable energy attributes of the `electricity'... are and were intended by the [DPUC in its decision approving the Agreement] to be sold by [Wheelabrator] and purchased by [CL & P]." Id. at *21-22. The DPUC then directed Wheelabrator to convey all existing and future credits to CL & P for the term of the Agreement as well as the proceeds from any prior sale of the credits. Id. at *32.
Wheelabrator filed an administrative appeal of the 2004 DPUC Decision in the Connecticut state courts but reserved its federal preemption and constitutional claims for adjudication in federal court. While the instant appeal was pending, the Connecticut Supreme Court issued an opinion affirming the 2004 DPUC Decision. Wheelabrator Lisbon, Inc. v. Dep't of Pub. Util. Control (Wheelabrator II), 283 Conn.672, 931 A.2d 159 (Conn.2007). The Connecticut Supreme Court held that the DPUC had jurisdiction to interpret the Agreement; that the 2004 DPUC Decision was supported by substantial evidence and consistent with state statutory law; and that the 2004 DPUC Decision did not constitute an unconstitutional taking under state constitutional law. Id. at 168-77.

D. FERC's Opinion in American Ref-Fuel

Wheelabrator's federal preemption claims are based in part on FERC's interpretation of PURPA in American Ref-Fuel, in which FERCon a petition for a declaratory order filed by the owners of qualifying small power production facilities, including Wheelabrator's parent companyclarified the application of certain FERC regulations implementing PURPA. American Ref-Fuel Company, 105 FERC at 61,004. In American Ref-Fuel, FERC declared "that contracts for the sale of ... energy entered into pursuant to PURPA do not convey RECs to the purchasing utility ... absent [an] express provision in [the relevant] contract" or a rule of state law to the contrary. Id. at 61,007; see also id. at 61,005 ("[A] state may decide that a sale of power at wholesale automatically transfers ownership of the state-created [credits], [but] that requirement must find its authority in state law, not PURPA."). FERC also noted that "RECs are created by the States. They exist outside the confines of PURPA. PURPA thus does not address the ownership of [the credits]." Id. at 61,007.


*188 E. Subsequent Procedural History
Shortly after the 2004 DPUC Decision, plaintiff brought the instant action against the DPUC and its individual commissioners pursuant to 42 U.S.C. § 1983, seeking declaratory and injunctive relief from the 2004 DPUC Decision. In particular, Wheelabrator sought declarations that (1) the asserted "modification" of the Agreement by the 2004 DPUC Decision was preempted by Section 210(e) of PURPA; (2) the 2004 DPUC Decision worked an unconstitutional taking in violation of the Fifth and Fourteenth Amendments; and (3) violated the constitutional prohibition on the impairment of the obligations of contracts, see U.S. Const. art. I, § 10, cl. 1. The District Court granted summary judgment to DPUC after concluding that the 2004 DPUC Decision did not modify the Agreement and, accordingly, no federal law or constitutional violation had occurred. See Wheelabrator I, 526 F.Supp.2d at 306-07. This appeal, pressing only the federal preemption claim, followed.

DISCUSSION
We review a District Court's decision to grant summary judgment de novo. See, e.g., Blouin v. Spitzer, 356 F.3d 348, 356 (2d Cir.2004).
Because the parties have not asked the District Court or our Court to review the merits of the 2004 DPUC Decision or the state Supreme Court's interpretation of applicable state law, we have no occasion to engage in such a review. Accordingly, the only issues on appeal are (1) whether the 2004 DPUC Decision "modified" the terms of the Agreement and, if so, whether such an action would constitute utility-type regulation precluded by Section 210(e) of PURPA; and (2) whether the 2004 DPUC Decision was preempted by FERC's interpretation of PURPA in American Ref-Fuel.

A. Section 210(e) of PURPA and its implementing regulations do not preempt the 2004 DPUC Decision.
The parties agree that if the 2004 DPUC Decision "modified" the terms of the Agreement, then such a modification would constitute a "utility-type regulation" in violation of Section 210(e) of PURPA, 16 U.S.C. § 824a-3(e). Our Court has not previously addressed this issue, but the Third Circuit has persuasively concluded that a state agency's modification of a power purchasing contract would violate PURPA § 210(e). See Freehold, 44 F.3d at 1192. In Freehold, the Third Circuit concluded that a state regulatory agency had modified the terms of a similar power purchase agreement by ordering that a qualifying facility renegotiate terms of the agreement with the utility. Id. at 1190. The Third Circuit observed that under the PURPA regulatory regime, FERCand not the state agencieswere responsible for regulating the rates charged by qualifying facilities in power purchase agreements. Id. at 1191. Under this regime, state regulatory agencies have the authority to implement PURPA in reviewing and approving contracts for the sale of electricity. Id. Once the relevant state agency has approved an agreement, however, revocation of that approval or an attempt to modify the agreement would subject the qualifying facility to "utility-type" regulation barred by Section 210(e) of PURPA. Id. at 1192.
We need not address whether a modification like the one presented in Freehold would violate Section 210(e), because we agree with the District Court that the 2004 DPUC decision in the instant case did not modify the terms of the contract. As the District Court explained, "the DPUC decisions are unlike the [state agency] order that was the subject of *189 Freehold." Wheelabrator I, 526 F.Supp.2d at 306. Unlike the New Jersey agency in Freehold, "the DPUC has not ordered the [qualifying facility] to renegotiate the contract purchase price or ordered lower rates. Rather, the DPUC considered the [energy purchase agreement] at issue and concluded that [it] transferred the renewable energy and the associated GIS Certificates to CL & P." Id. We agree that the DPUC did not order the renegotiation of the terms of the Agreement but simply exercised its authority to interpret the Agreement's provisionsas it happens, in a manner that was unfavorable to Wheelabrator. See Wheelabrator II, 931 A.2d at 171 (upholding the DPUC's jurisdiction to interpret the Agreement). We hold, therefore, that the 2004 DPUC Decision does not modify the terms of the Agreement and, accordingly, does not violate Section 210(e) of PURPA.[10]
In sum, the District Court correctly concluded that the 2004 DPUC Decision was not preempted by PURPA or its implementing regulations.

B. American Ref-Fuel does not preempt the 2004 DPUC Decision.
Wheelabrator also contends the 2004 DPUC Decision is inconsistent with FERC's decision in American Ref-Fuel and, therefore, is preempted by American Ref-Fuel. See, e.g., Louisiana Pub. Serv. Comm'n, 476 U.S. at 368-69, 106 S.Ct. 1890 (holding that a federal agency acting within the scope of its delegated authority has the power to preempt state regulation). Specifically, Wheelabrator argues that FERC intended for RECs to be sold through express contractual provisions and that, in the absence of such a provision, an electricity purchase agreement cannot convey RECs.
We agree with the District Court, and with FERC, that American Ref-Fuel did not impose such a rule. As the District Court correctly observed:
[In American Ref-Fuel,] [t]he FERC concluded that RECs are created by the State and controlled by state law, not PURPA, and that they may be decoupled from the renewable energy. ... Taken as a whole, however, American Ref-Fuel does not stand for the proposition that PURPA requires an express contractual provision in order for RECs or GIS Certificates to be transferred to a public utility pursuant to a PURPA contract. ... [American Ref-Fuel's] parenthetical reference to the effect of an express contractual provision might suggest that the FERC considered an express contractual provision to be the only means for RECs, associated with energy sold pursuant to a PURPA contract, to be transferred to a utility. ... In its order denying rehearing, the FERC noted that the reference to an "express contractual provision" seems to have been misunderstood. American Ref-Fuel, 107 FERC ¶ 61,016, at 61,042 n. 1 (2004). The FERC elaborated: "We did not mean to suggest that the parties to a PURPA contract, by contract, could undo the requirements of State law in this regard. All we intended by this language was to indicate that a PURPA contract did not inherently *190 convey any RECs, and correspondingly that, assuming State law did not provide to the contrary, the [qualifying facility] by contract could separately convey the RECs." Id. (emphasis added).
Wheelabrator I, 526 F.Supp.2d at 305-06 & n. 5.
In sum, the FERC decision in American Ref-Fuel does not evince an intent to occupy the relevant fieldnamely, the regulation of renewable energy credits. Rather, it explicitly acknowledges that state law governs the conveyance of RECs. See American Ref-Fuel, 105 FERC at 61,007 (stating that, because "RECs are created by the States[,]. ... States ... have the power to determine who owns the [RECs] in the initial instance and how they may be sold or traded; it is not an issue controlled by PURPA"); id. at 61,005 ("[A] state may decide that a sale of power at wholesale automatically transfers ownership of the state-created RECs [but] that requirement must find its authority in state law, not PURPA."). We conclude, therefore, that the American Ref-Fuel does not preempt the 2004 DPUC Decision.

CONCLUSION
For the reasons stated above, the judgment of the District Court is AFFIRMED.
NOTES
[1]  All individual defendants are sued in their official capacities.
[2]  In March 2004, DPUC issued a declaratory ruling that a similar contract for the sale of energy also effects the transfer of renewable energy credits, see DPUC Decision, In re: Application of Minnesota Methane, LLC Regarding the Sale of Elec. Generated at the Hartford Landfill to the Conn. Light and Power Co., Docket No. 96-07-21RE01, 2004 WL 1468418, 2004 Conn. PUC Lexis 39 (DPUC Mar. 19, 2004). In December 2004, DPUC issued a subsequent decision specifically addressing the Wheelabrator Agreement, see DPUC Decision, In re: Petition of the Riley Energy Corp. for Contract Approval and Declaratory Rulings Regarding Lisbon Res. Recovery ProjectGeneral Info. Sys. Certificates, Docket No. 91-01-12RE01, 2004 WL 3160409, 2004 Conn. PUC Lexis 148 (DPUC Dec. 6, 2004). For ease of reference, we refer to the portions of both decisions that pertain to the Wheelabrator Agreement as the "2004 DPUC Decision."

We refer to the DPUC decision approving the Wheelabrator Agreement as the "1991 DPUC Decision." See DPUC Decision, In re: Petition of the Riley Energy Corp. for Contract Approval and Declaratory Rulings Regarding Lisbon Res. Recovery Project, Docket No. 91-01-12, 1991 WL 519669, 1991 Conn. PUC Lexis 24 (DPUC Mar. 13, 1991).
[3]  The Agreement was struck between Wheelabrator's predecessor-in-interest and CL & P. For ease of reference, we refer to Wheelabrator and its predecessor-in-interest simply as "Wheelabrator".
[4]  The description of the factual and legal background relies in substantial part on the June 23, 2006 Memorandum of Decision of the District Court, Wheelabrator Lisbon Inc. v. Connecticut Dept. of Pub. Util. Control (Wheelabrator I), 526 F.Supp.2d 295 (D.Conn.2006).
[5]  For the purposes of PURPA, a "cogeneration facility" is "a facility which produces(i) electric energy, and (ii) steam or forms of useful energy (such as heat) which are used for industrial, commercial, heating, or cooling purposes." 16 U.S.C. § 796(18)(A). A "small power production facility" is a

facility which is an eligible solar, wind, waste, or geothermal facility, or a facility which(i) produces electric energy solely by the use, as a primary energy source, of biomass, waste, renewable resources, geothermal resources, or any combination thereof; and (ii) has a power production capacity which, together with any other facilities located at the same site (as determined by the Commission), is not greater than 80 megawatts.
Id. § 796(17)(A).
We use the term "renewable energy" to mean energy produced through the use of renewable energy sources, such as biomass, waste, and geothermal resources. See 18 C.F.R. §§ 292.204-205 (defining qualifying facility under PURPA); see Conn. Gen.Stat. §§ 16-243b(a)(1)(B), (a)(3)(C) (providing a similar definition for purposes of state regulation).
[6]  There is no dispute that Wheelabrator's plant in Lisbon is a qualifying facility within the meaning of PURPA. See 16 U.S.C. § 796(17)(C); 18 C.F.R. § 292.204.
[7]  Section 210(e) of PURPA, and the corresponding implementing regulations, exempt qualifying facilities from certain federal laws and regulations as well as state laws and regulations "respecting the rates, or respecting the financial or organizational regulation, of electric utilities. ..." 16 U.S.C. § 824a-3(e). This exemption is referred to as the "exempt[ion] from ... utility-type ... regulation." See, e.g., Freehold Cogeneration Assocs., L.P. v. Bd. of Reg. Comm'rs of State of N.J., 44 F.3d 1178, 1185 (3d Cir.1995).
[8]  At the time the Agreement was approved, CL & P was subject to regulation by DPUC as an "electric company," see Conn. Gen.Stat. § 16-1(a)(8), and a "public service company," see Conn. Gen.Stat. § 16-1(a)(4). Wheelabrator I, 526 F.Supp.2d at 298.
[9]  GIS Certificates are created by the New England Power Pool and distributed to renewable energy generators, such as Wheelabrator, based on the electric output of their facilities. Wheelabrator I, 526 F.Supp.2d at 299. Wheelabrator received one GIS Certificate for each megawatt-hour produced by its Lisbon facility. Id.
[10]  Nor is there any evidence in the record that Congress intended to occupy the field or otherwise preempt state regulation of the ownership of RECs entirely. See Louisiana Pub. Serv. Comm'n v. FCC, 476 U.S. 355, 368-69, 106 S.Ct. 1890, 90 L.Ed.2d 369 (1986) (discussing general principles of preemption by a federal agency); cf. FERC, 456 U.S. at 765-70, 102 S.Ct. 2126 (concluding that PURPA does not preempt state regulation of utility rate-making); American Ref-Fuel, 105 FERC at 61,007 ("RECs ... exist outside the confines of PURPA. PURPA thus does not address the ownership of RECs.").
