Stay and repropose existing major EPA rules and guidance

Research notes

• The Mandate’s verb is “stay”; EPA mostly reconsidered rather than formally stayed (the presidential proclamations of April 2025 exempting sources from MATS and other rules are the closest thing to stays and are not tracked here).
• Done was confirmed in a consistency review. The Quote asks for two things — “identify existing rules to be stayed and reproposed” and “initiate rule development in appropriate media offices” — and both were fully performed: the 31-action list is the identification, and OAR, OW and the other media offices have run proposals through to final rules. Several individual rules are still at proposal, but the ask is about the process, not about any one rule, so that does not hold it below done.
• Federal Register API search for the power-plant GHG repeal as a final rule (2026-08-27): proposal only.
• 2026-09-24: that sentence is now out of date, and the reading is unchanged. The power-plant GHG repeal went partly final on 2026-09-17 — EPA repealed most of the 2024 Carbon Pollution Standards (FR 2026-19071) and, the same day, issued a supplemental proposal to rescind the 2015 findings and repeal every remaining §111 GHG standard for the source category (FR 2026-19072). The identify → repropose → finalize cycle this item is done on has now run end to end for most of one of the two major rules the 2026-02-24 event named as still at proposal (the PM2.5 NAAQS is the other); the 2015 NSPS and the rest of the 2024 standards are back at proposal. No event was added: the Status is already done and the ask is about the process, not about any one rule. The leveling of the repeal itself is #1094’s, and the sequence for §111(d)‘s general implementing regulations is #1096’s; neither of those is touched by this note.
• Reviewed 2026-09-23: both documents read in full at https://www.govinfo.gov/content/pkg/FR-2026-09-17/html/2026-19071.htm and https://www.govinfo.gov/content/pkg/FR-2026-09-17/html/2026-19072.htm. The final rule repeals “based on a reevaluation of the best system of emission reduction”, is effective 2026-11-16, and says of the June 2025 primary proposal’s predicate determinations that EPA “is not acting on those proposed determinations at this time”; the supplemental proposal takes comments to 2026-11-02 and says “We are not reopening that final rule.” The note above stands as corrected.
• 2026-10-05: the first petition against the 2026-09-17 repeal. State of New York v. EPA, D.C. Cir. 26-1259, was filed 2026-10-01 under CAA §307(b)(1) by 20 states, Massachusetts, the Governor of Pennsylvania, D.C., Chicago, New York City and Denver. It seeks review of Partial Repeal of the Carbon Pollution Standards for Fossil Fuel-Fired Electric Generating Units, 91 Fed. Reg. 58954. We read the petition at https://storage.courtlistener.com/recap/gov.uscourts.cadc.43642/gov.uscourts.cadc.43642.01208893571.0_1.pdf; the docket is https://www.courtlistener.com/docket/74902809/state-of-new-york-v-epa/ . A petition moves no rung, and this item is leveled on the process rather than any one rule, so no event was added. A stay or vacatur would belong first to whichever item levels the repeal itself.