EPA Proposes Approval of Oklahoma's Regional Haze Plan Revision
Published Date: 8/27/2026
Proposed Rule
Summary
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.
Analyzed Economic Effects
1 provisions identified: 1 benefits, 0 costs, 0 mixed.
Unit 3 Allowed To Keep Running On Gas
The EPA is proposing to approve Oklahoma's March 12, 2026 SIP revision that removes the requirement that AEP/PSO Northeastern Unit 3 cease operations by December 31, 2026 and allows Unit 3 to continue operating as a pipeline‑grade natural gas unit. Under the approved terms Unit 3 would be limited to 300 tons per year (TPY) of NOX and nominal SO2 emissions of 2.34 TPY, while PSO committed to lower Unit 2 NOX by 300 TPY and impose a Unit 2 NOX rate of 0.22 lbs/MMBtu (30‑day rolling average) by January 1, 2027.
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