A Methane Mixed Bag: EPA Finalizes Methane Rule for New and Existing Oil and Gas Facilities


On December 2, 2023, the U.S. Environmental Protection Agency (EPA) released a pre-publication version of its final Standards of Performance for New, Reconstructed, and Modified Sources and Emissions Guidelines for Existing Sources: Oil and Natural Gas Sector Climate Review (Final Rule). The Final Rule comes more than two years after EPA published its initial proposal on November 15, 2021 (Initial Proposal) and a supplemental proposal on December 6, 2022 (Supplemental Proposal) (collectively, the “Proposals”). According to EPA, the agency received over one million comments on the Proposals.  For information on the Proposals, please see our November 11, 2021 and December 12, 2022 Alerts. This Alert focuses on critical aspects of the Final Rule, including key changes that EPA made since issuing the Proposals.[1]

Brief Overview of Methane Rule

The Methane Rule is comprised of four separate actions proposed under sections 111(b) and 111(d) of the Clean Air Act. EPA currently regulates emissions of volatile organic compounds (VOCs) and methane from oil and natural gas facilities under 40 C.F.R. Part 60 Subparts OOOO[2] and OOOOa.[3] First, through this Final Rule, EPA will regulate oil and natural gas facilities constructed, modified, or reconstructed after December 6, 2022, under a new Subpart OOOOb.  The requirements in OOOOb will apply to affected facilities 60 days after the rule is published in the Federal Register.  Second, under a new Subpart OOOOc, EPA finalized emissions guidelines that are intended to inform states in the development, submittal, and implementation of state plans to establish standards of performance for greenhouse gases (in the form of limitations on methane) from sources existing on or before December 6, 2022.  Under the Final Rule, states and tribes are required to submit plans to EPA for review within 24 months of the publication of the Final Rule in the Federal Register, with a compliance deadline for existing sources that is no later than 36 months after the deadline to submit the plan to EPA.  Third, the Final Rule amends OOOOa in response to Congress’ June 2021 revocation of regulatory amendments made by EPA under the Trump administration. Fourth, the Final Rule also includes “Appendix K,” a protocol for determining leaks using Optical Gas Imaging (OGI) that EPA now requires at natural gas processing plants regulated by OOOOb or OOOOc.

Key Requirements of Methane Rule

Significant changes from the existing OOOO and OOOOa regulatory frameworks include:

Additional notable requirements include the use of zero-emission pneumatic controllers and pneumatic pumps, a “no identifiable emissions” standard for closed vent systems, and the use of best management practices aimed to minimize or eliminate VOC or methane emissions during well liquids unloading.


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National Law Review, Volume XIII, Number 347