Home / Agencies / EPA / 2026-11436
Proposed Rule

Approval and Promulgation of Air Quality Implementation Plans; Wyoming; Regional Haze Federal Implementation Plan

Agency
EPA
Document Number
2026-11436
Published
June 8, 2026
Effective Date
-

Abstract

The U.S. Environmental Protection Agency (EPA) is proposing revisions to the Federal Implementation Plan (FIP) addressing regional haze in the State of Wyoming. The EPA is proposing revisions to the FIP's nitrogen oxides (NO<INF>X</INF>) best available retrofit technology (BART) requirements for the PacifiCorp Dave Johnston Power Plant Unit 3. In response to PacifiCorp's letter no longer consenting to closure of Dave Johnston Unit 3, the EPA is proposing to withdraw the NO<INF>X</INF> BART determination containing the closure requirement. Additionally, in response to a request from PacifiCorp, and in light of new information that was not available at the time the EPA originally promulgated the FIP in 2014, the Agency is also proposing to revise the other NO<INF>X</INF> BART determination for Dave Johnston Unit 3.

Federal Register Source

This document is published by the Office of the Federal Register, National Archives and Records Administration. Access the full regulatory text, preamble, and docket comments below.

View Full Text on FederalRegister.gov →

Opens in new tab · federalregister.gov

Frequently Asked Questions

What is the 2026-11436 Federal Register document?
Document 2026-11436 is a Proposed Rule published by the Environmental Protection Agency in the Federal Register on June 8, 2026. The U.S. Environmental Protection Agency (EPA) is proposing revisions to the Federal Implementation Plan (FIP) addressing regional haze in the State of Wyoming. The EPA is proposing revisions to the FIP's nitrogen oxides (NO<INF>X</INF>) best available retrofit technology (BART) requirements for the PacifiCorp Dave Johnston Power Plant Unit 3. In response to PacifiCorp's letter no longer consenting to closure of Dave Johnston Unit 3, the EPA is proposing to withdraw the NO<INF>X</INF> BART determination containing the closure requirement. Additionally, in response to a request from PacifiCorp, and in light of new information that was not available at the time the EPA originally promulgated the FIP in 2014, the Agency is also proposing to revise the other NO<INF>X</INF> BART determination for Dave Johnston Unit 3. View the original at https://www.federalregister.gov/documents/2026/06/08/2026-11436/approval-and-promulgation-of-air-quality-implementation-plans-wyoming-regional-haze-federal.
Is document 2026-11436 an economically significant rule?
No. Document 2026-11436 is not classified as economically significant under Executive Order 12866. Economically significant rules require OIRA review and are estimated to have impacts of $100 million or more per year.

Other Rules from EPA

National Emission Standards for Hazardous Air Pollutants: Plywood and Composite Wood Products
Final Rule · Jul 2026
Receipt of Pesticide Petitions Filed for Residues of Pesticide Chemicals in or on Various Commodities-April 2026
Proposed · Jul 2026
Air Plan Approval; Oklahoma; Updates to the State Implementation Plan for New Source Review Permitting and General SIP Provisions
Final Rule · Jul 2026
Air Plan Approval; Delaware; 2006 24-Hour Fine Particulate Matter Limited Maintenance Plan for the Philadelphia Nonattainment Area
Final Rule · Jul 2026
Federal Plan Requirements for Other Solid Waste Incineration Units That Commenced Construction on or Before August 31, 2020, and Have Not Been Modified or Reconstructed After August 29, 2025
Proposed · Jul 2026
Air Plan Approval; Alabama; Transportation Conformity
Proposed · Jul 2026
View all Environmental Protection Agency rules →

Read our methodology - how this data is sourced, computed, and verified.

Related

Browse all → | Rankings →
Data sourced from official state legislatures, IAPP, NCSL, and federal regulatory trackers. See our methodology for details. Retrieved and formatted by PlainRegWatch Editorial

Every figure on PlainRegWatch is rendered directly from state source data, no number is typed in by an editor. This page draws directly on federal and state source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.