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On December 2, 2023, the United States Environmental Protection Agency (EPA) issued the pre-publication version of its Final Rule for standards of performance in the Oil and Natural Gas sector. The original proposed rule, published on November 15, 2021, sought to strengthen methane standards for new sources (New Source Performance Standards or NSPS), establish nationwide emission guidelines (EG) for regulation of existing sources, and develop new standards for unregulated sources. EPA later issued a supplemental proposed rulemaking on November 15, 2022 (2022 Supplemental Proposed Rulemaking), as we summarized in our previous post. In total, EPA received nearly 1 million public comments on this rulemaking. The rules, when published in the federal register, will be included in 40 CFR Part 60, Subpart OOOOb (NSPS) and Subpart OOOOc (EG).