Federal Register #EPA-R05-OAR-2025-1377

EPA Review of Alternative NOX Emissions Limits for Oak Creek Power Plant Turbines

This opportunity involves the Environmental Protection Agency (EPA), Region 5, reviewing a proposed revision to Wisconsin's State Implementation Plan (SIP) for the Oak Creek Power Plant: - Government Buyer: - Environmental Protection Agency (EPA), Region 5 - Facility: Oak Creek Power Plant, Oak Creek, Wisconsin - No OEMs or commercial vendors are named in the notice - Products/Services Requested: - Approval of alternative nitrogen oxides (NOX) emissions limits for new natural gas-fired turbines - Implementation of a 9 ppmdv NOX limit (30-day rolling average) during normal operation - Specific NOX emission caps per start-up (57.1 lbs) and shut-down (31.7 lbs) event - Maximum of 2,500 start-up/shut-down events per year - Installation and operation of continuous emission monitoring systems (CEMS) on each turbine - Recordkeeping and reporting of excess emissions - Unique/Notable Requirements: - Alternative NOX limits tailored for peaking units with frequent cycling - EPA analysis confirms lower annual NOX emissions and compliance with Clean Air Act - Supported by technical analysis and emissions modeling from Wisconsin DNR and We Energies - No specific procurement of products or services, OEMs, or vendors is identified in this notice

Description

The Environmental Protection Agency (EPA) is proposing to approve a revision to the State of Wisconsin's State Implementation Plan (SIP) for the Oak Creek Power Plant located in Oak Creek, Wisconsin. The revision includes alternative nitrogen oxides (NOX) emissions limits for the Oak Creek facility, allowing it to operate in compliance with State and Federal regulations while emitting less NOX over time compared to current limits. The new turbines at the facility will operate as peaking units with varied daily start-up and shut-down events, and the alternative limits accommodate these operational scenarios. The EPA finds that the alternative limits will not interfere with the National Ambient Air Quality Standards (NAAQS) and meet all applicable requirements under the Clean Air Act (CAA).

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