Air Plan Approval; Oklahoma; Regional Haze Plan for the First Implementation Revision; Revision to State Implementation Plan and Requirements
Key claim: EPA is proposing to approve Oklahoma’s updated air-pollution requirements for the AEP/PSO Northeastern Power Station under the regional haze program.
Abstract
(Proposed Rule · Environmental Protection Agency) Pursuant to the Federal Clean Air Act (CAA or the Act), the Environmental Protection Agency (EPA) is proposing to approve the State implementation plan (SIP) revision submitted by the State of Oklahoma on March 12, 2026, (Oklahoma’s 2026 SIP submission) for the regional haze program’s first implementation (planning) period. Oklahoma’s 2026 SIP submission revises previously approved source-specific requirements for the American Electric Power/Public Service of Oklahoma (AEP/PSO) Northeastern Power Station as part of the State’s long-term strategy for the first planning period. The EPA is proposing to find that this SIP revision meets the requirements of the CAA and the Regional Haze Rule.
Why this matters
Regional haze SIP revisions determine how individual power plants such as PSO’s Northeastern Power Station control NOx, SO2, and PM to improve visibility in Class I areas, and EPA’s approval locks in the state’s chosen emission limits and compliance schedule. Source-specific approvals like this shape actual utility compliance costs and pollution outcomes far more than headline national standards, even though they draw little attention.