Federal Register #EPA-R02-OAR-2025-0243

EPA Approval of NOx Emission Controls for Athens Generating Plant (Westinghouse Turbines)

This EPA regulatory action approves a State Implementation Plan (SIP) revision for the Athens Generating Plant in New York, focusing on NOx emission controls for three Westinghouse combined-cycle turbines. - Government Buyer: - Environmental Protection Agency (EPA), Region 2 Office, 290 Broadway, 25th Floor, New York, NY - OEMs and Vendors: - Westinghouse (manufacturer of the 501G combustion turbines) - Products/Services Requested: - Three Westinghouse model 501G combined-cycle combustion turbines (Emission Units U-00001, U-00002, U-00003) - Part numbers: 501G, U00001, U00002, U00003 - Associated heat recovery steam generators and steam turbines - Emission control technologies: - Selective Catalytic Reduction (SCR) - Dry Low-NOX (DLN) burners for natural gas - Water/steam injection for distillate fuel oil - Continuous Emission Monitoring Systems (CEMS) - Unique/Notable Requirements: - NOx emission limits: less than 23.4 lbs/hour (natural gas), 101.9 lbs/hour (fuel oil) - NOx concentration limits: 2.0 ppmv (natural gas), 9.0 ppmv (fuel oil), averaged over 3-hour blocks - Controls must meet Reasonably Available Control Technology (RACT), Best Available Control Technology (BACT), and Lowest Achievable Emission Rate (LAER) standards - Compliance monitored by CEMS - Places of Performance and Delivery: - Athens Generating Plant, 9300 US Route 9 West, Athens, NY 12015 - EPA Region 2 Office, 290 Broadway, 25th Floor, New York, NY 10007-1866

Description

The Environmental Protection Agency (EPA) is approving a revision to the State of New York's State Implementation Plan (SIP) for the ozone National Ambient Air Quality Standard (NAAQS) related to a Source-specific SIP (SSSIP) revision for the Athens Generating Plant located at 9300 US Route 9 West, Athens, NY. The revision implements Reasonably Available Control Technology (RACT) for Oxides of Nitrogen (NOx) emissions from three combined-cycle Westinghouse model 501G combustion turbines with associated heat recovery steam generators and steam turbines. The EPA finds that the control options meet the requirements of the Clean Air Act (CAA). This final rule is effective June 29, 2026.

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