On July 31, 2025, EPA published in the Federal Register its highly anticipated Interim Final Rule to extend several deadlines in 40 C.F.R. Part 60, Subparts OOOO, OOOOa, OOOOb and OOOOc that were promulgated in EPA’s 2024 Methane Rule. 90 Fed. Reg. 35966 (July 31, 2025). That same day, environmental groups filed a lawsuit challenging the Interim File Rule. Envtl. Defense Fund v. U.S. EPA, Case #25-1164 (D.C. Cir.). Absent a stay by the court, which the environmental groups are currently not seeking, the Interim Final Rule and the various extended deadlines are effective.

Summary of Deadline Extensions

The Interim Final Rule extends numerous compliance deadlines for oil and gas air emission sources subject to the New Source Performance Standards in 40 C.F.R. Part 60 Subparts OOOO, OOOOa, OOOOb and OOOOc. The previous compliance deadlines were published in a March 2024 final rule. 89 Fed. Reg. 16820 (March 8, 2024). The Interim Final Rule, which became effective upon publication, extends many deadlines in OOOOb, the date that the requirements of the Super-Emitter Program apply with respect to OOOO, OOOOa, and OOOOb, and the date by which states must submit plans to EPA pursuant to the OOOOc emissions guidelines.

EPA extended the following OOOOb compliance deadlines to at least January 22, 2027:

• Process Controllers: The date by which process controller affected facilities are required to be zero-bleed devices. 40 CFR §§ 60.5370b(a)(5)(i), 60.5390b(a), 60.5415b(h)(1).
• Storage Vessels:
  • The date by which receiving additional crude oil, condensate, intermediate hydrocarbons, or produced water throughput at tank batteries triggers a modification. 40 CFR § 60.5365b(e)(3)(ii)(C) and (D).
  • The date by which a legally and practicably enforceable limit used to determine the potential VOC and methane emissions from a storage vessel must include the elements provided in paragraphs 40 CFR § 60.5365b(e)(2)(i)(A) through (F). 40 CFR § 60.5365b(e)(2)(i).
  • The date by which the potential for VOC and methane emissions from storage vessels must be calculated using a generally accepted model or calculation methodology that accounts for flashing, working, and breathing losses, based on the maximum average daily throughput to the tank battery determined for a 30-day period of production. 40 CFR § 60.5365b(e)(2)(ii).
• Covers and Closed Vent Systems: The date by which a required closed vent system or cover must be designed and operated with no identifiable emissions and corresponding inspections must be performed. This new compliance deadline is 18 months after the date the Interim Final Rule is published in the Federal Register or upon startup, whichever is later. 40 CFR §§ 60.5411b(a)(3), § 60.5411b(b)(4), 60.5416b(a)–(b).
• Control Devices: The date by which you must install and operate a continuous burning pilot or combustion flame, as applicable, and the date by which an alert must be sent to the nearest control room whenever the pilot or combustion flame is unlit. 40 CFR §§ 60.5412b(a)(1)(viii) and (3)(viii), 60.5413b(e)(2), 60.5415b(f)(1)(vii)(A)(1), 60.5417b(d)(8)(i), 60.5417b(i)(6)(v).

EPA also gave regulated facilities until November 28, 2025, or 180 days after startup, whichever is later, to comply with continuous monitoring system requirements for enclosed combustors or flares. 40 CFR §§ 60.5370b(a)(9)(i) and (iii).

Regarding OOOOc, the EPA emission guidelines that States are required to use when regulating existing sources (i.e., regulated emission sources that commenced construction, modification, or reconstruction on or before December 6, 2022), EPA extended the deadline for States to submit their OOOOc plans to January 22, 2027. 40 CFR § 60.5362c(c). As indicated in our recent Alert, the Pennsylvania Department of Environmental Protection (“PADEP”) has issued public notice and provided an opportunity for comment for its proposed OOOOc plan. The comment period on PADEP’s proposed OOOOc plan closed on July 30, 2025. Several commenters urged PADEP to delay implementation of the OOOOc plan until EPA finalizes its reconsideration of OOOOc, and others raised concerns about PADEP’s analysis, or lack thereof, related to considering the “remaining useful life and other factors” when devising the proposed OOOOc plan requirements. PADEP’s proposed OOOOc plan noted the original March 2026 deadline for submission to EPA. It remains to be seen whether PADEP will continue moving forward with its plan given that it now has an additional 10 months to finalize and submit Pennsylvania’s OOOOc plan to EPA for approval.

EPA also extended deadlines in OOOOa and OOOOb associated with the so-called “super emitter program” created under the March 2024 Methane Rule. In the preamble for the Interim Final Rule, EPA notes that in implementing the “super emitter program,” which would allow EPA-approved third parties (using EPA-approved technologies) to provide EPA with data on super-emission events, “EPA has experienced unanticipated difficulties and concerns that require additional time for effective and lawful administration of various program procedures.” 90 Fed. Reg. at 35976. EPA is delaying implementation of the super-emitter program until after January 22, 2027, during which time EPA will not act on applications seeking approval for remote-detection technologies for use under the program. See 40 CFR §§ 60.5371a and 60.5371b.

The Interim Final Rule indicates that EPA may make additional, substantive revisions to the 2024 Methane Rule in a separate reconsideration action. EPA invites comments on the revisions in the Interim Final Rule by September 2, 2025, even though the rule became effective on July 31, 2025.

Environmental Groups’ Challenge

Ten environmental groups promptly filed a petition for review in the U.S. Court of Appeals for the District of Columbia Circuit, challenging the Interim Final Rule. The Court has set initial filing deadlines, including a deadline to file any dispositive motions by September 18, 2025. A briefing schedule has not been established.

Press releases by the environmental groups suggest that they may attack the Interim Final Rule on both procedural and substantive groups. Procedurally, the grounds contend that EPA violated the law by offering no opportunity for public input. Substantively, the groups indicate that they plan to defend the 2024 Methane Rule requirements, including the original deadlines and requirements of that rule.