Review of New Source Performance Standards for Stationary Combustion Turbines and Stationary Gas Turbines

ENVIRONMENTAL PROTECTION AGENCY <CFR>40 CFR Part 60</CFR> <DEPDOC>[EPA-HQ-OAR-2024-0419; FRL-11542-01-OAR]</DEPDOC> <RIN>RIN 2060-AW21</RIN> <SUBJECT>Review of New Source Performance Standards for Stationary Combustion Turbines and Stationary Gas Turbines</SUBJECT> <HD SOURCE="HED">AGENCY:</HD> Environmental Protection Agency (EPA). <HD SOURCE="HED">ACTION:</HD> Proposed rule. <SUM> <HD SOURCE="HED">SUMMARY:</HD> The Environmental Protection Agency (EPA) is proposing amendments to the Standards of Performance for new, modified, and reconstructed stationary combustion turbines and stationary gas turbines based on a review of available control technologies for limiting emissions of criteria air pollutants. This review of the new source performance standards (NSPS) is required by the Clean Air Act (CAA). As a result of this review, the EPA is proposing to establish size-based subcategories for new, modified, and reconstructed stationary combustion turbines that also recognize distinctions between those that operate at varying loads or capacity factors and those firing natural gas or non-natural gas fuels. In general, the EPA is proposing that combustion controls with the addition of post-combustion selective catalytic reduction (SCR) is the best system of emission reduction (BSER) for limiting nitrogen oxide (NO <E T="52">X</E> ) emissions from this source category, with certain, limited exceptions. Based on the application of this BSER and other updates in technical information, the EPA is proposing to lower the NO <E T="52">X</E> standards of performance for most of the stationary combustion turbines included in this source category. In addition, for new, modified, and reconstructed stationary combustion turbines that fire or co-fire hydrogen, the EPA is proposing to ensure that those sources are subject to the same level of control for NO <E T="52">X</E> emissions as sources firing natural gas or non-natural gas fuels, depending on the percentage of hydrogen fuel being utilized. The EPA is proposing to maintain the current standards for sulfur dioxide (SO <E T="52">2</E> ) emissions, because after reviewing the current SO <E T="52">2</E> standards, we propose to find that the use of low-sulfur fuels remains the BSER. Finally, the Agency is proposing amendments to address specific technical and editorial issues to clarify the existing regulations. </SUM> <DATES> <HD SOURCE="HED">DATES:</HD> <E T="03">Comments.</E> Comments must be received on or before March 13, 2025. Comments on the information collection provisions submitted to the Office of Management and Budget (OMB) under the Paperwork Reduction Act (PRA) are best assured of consideration by OMB if OMB receives a copy of your comments on or before January 13, 2025. For specific instructions, please see the PRA discussion in the <E T="03">Statutory and Executive Order Reviews</E> section of this document. <E T="03">Public Hearing.</E> If anyone contacts us requesting a public hearing on or before December 18, 2024, we will hold a virtual public hearing. See <E T="02">SUPPLEMENTARY INFORMATION</E> for information on requesting and registering for a public hearing. </DATES> <HD SOURCE="HED">ADDRESSES:</HD> You may send comments, identified by Docket ID No. EPA-HQ-OAR-2024-0419, by any of the following methods: • <E T="03">Federal eRulemaking Portal:</E> <E T="03">https://www.regulations.gov</E> (our preferred method). Follow the online instructions for submitting comments. • <E T="03">Email:</E> <E T="03">a-and-r-docket@epa.gov.</E> Include Docket ID No. EPA-HQ-OAR-2024-0419 in the subject line of the message. • <E T="03">Fax:</E> (202) 566-9744. Attention Docket ID No. EPA-HQ-OAR-2024-0419. • <E T="03">Mail:</E> U.S. Environmental Protection Agency, EPA Docket Center, Docket ID No. EPA-HQ-OAR-2024-0419, Mail Code 28221T, 1200 Pennsylvania Avenue NW, Washington, DC 20460. • <E T="03">Hand/Courier Delivery:</E> EPA Docket Center, WJC West Building, Room 3334, 1301 Constitution Avenue NW, Washington, DC 20004. The Docket Center's hours of operation are 8:30 a.m.-4:30 p.m., Monday-Friday (except Federal Holidays). <E T="03">Instructions:</E> All submissions received must include the Docket ID No. for this rulemaking. Comments received may be posted without change to <E T="03">https://www.regulations.gov,</E> including any personal information provided. For detailed instructions on sending comments and additional information on the rulemaking process, see the <E T="02">SUPPLEMENTARY INFORMATION</E> section below. <FURINF> <HD SOURCE="HED">FOR FURTHER INFORMATION CONTACT:</HD> John Ashley, Sector Policies and Programs Division (D243-02), Office of Air Quality Planning and Standards, U.S. Environmental Protection Agency, 109 T.W. Alexander Drive, P.O. Box 12055 RTP, North Carolina 27711; telephone number: (919) 541-1458; and email address: <E T="03">ashley.john@epa.gov.</E> </FURINF> <SUPLINF> <HD SOURCE="HED">SUPPLEMENTARY INFORMATION:</HD> <E T="03">Participation in virtual public hearing.</E> To request a virtual public hearing, contact the public hearing team at (888) 372-8699 or by email at <E T="03">SPPDpublichearing@epa.gov.</E> If requested, the public hearing will be held via virtual platform. The EPA will announce the date of the hearing and additional details on the virtual public hearing at <E T="03">https://www.epa.gov/stationary-sources-air-pollution/stationary-gas-and-combustion-turbines-new-source-performance.</E> The hearing will convene at 11:00 a.m. Eastern Time (ET) and will conclude at 4:00 p.m. ET. The EPA may close a session 15 minutes after the last pre-registered speaker has testified if there are no additional speakers. The EPA will begin pre-registering speakers for the hearing no later than 1 business day after a request has been received. The EPA will accept registrations on an individual basis. To register to speak at the virtual hearing, please use the online registration form available at <E T="03">https://www.epa.gov/stationary-sources-air-pollution/stationary-gas-and-combustion-turbines-new-source-performance</E> or contact the public hearing team at (888) 372-8699 or by email at <E T="03">SPPDpublichearing@epa.gov.</E> The last day to pre-register to speak at the hearing will be December 26, 2024. Prior to the hearing, the EPA will post a general agenda that will list pre-registered speakers at: <E T="03">https://www.epa.gov/stationary-sources-air-pollution/stationary-gas-and-combustion-turbines-new-source-performance.</E> The EPA will make every effort to follow the schedule as closely as possible on the day of the hearing; however, please plan for the hearing to run either ahead of schedule or behind schedule. Each commenter will have 4 minutes to provide oral testimony. The EPA encourages commenters to submit a copy of their oral testimony as written comments electronically to the rulemaking docket. The EPA may ask clarifying questions during the oral presentations but will not respond to the presentations at that time. Written statements and supporting information submitted during the comment period will be considered with the same weight as oral testimony and supporting information presented at the public hearing. Please note that any updates made to any aspect of the hearing will be posted online at <E T="03">https://www.epa.gov/stationary-sources-air-pollution/stationary-gas-and-combustion-turbines-new-source-performance.</E> While the EPA expects the hearing to go forward as described in this section, please monitor our website or contact the public hearing team at (888) 372-8699 or by email at <E T="03">SPPDpublichearing@epa.gov</E> to determine if there are any updates. The EPA does not intend to publish a document in the <E T="04">Federal Register</E> announcing updates. If you require the services of a translator or a special accommodation such as audio description, please pre-register for the hearing with the public hearing team and describe your needs by December 20, 2024. The EPA may not be able to arrange accommodations without advanced notice. <E T="03">Docket.</E> The EPA has established a docket for this rulemaking under Docket ID No. EPA-HQ-OAR-2024-0419. All documents in the docket are listed in the <E T="03">Regulations.gov</E> index. Although listed in the index, some information is not publicly available, <E T="03">e.g.,</E> Confidential Business Information (CBI) or other information whose disclosure is restricted by statute. Certain other material, such as copyrighted material, is not placed on the internet and will be publicly available only as pdf versions that can only be accessed on the EPA computers in the docket office reading room. Certain databases and physical items cannot be downloaded from the docket but may be requested by contacting the docket office at (202) 566-1744. The docket office has up to 10 business days to respond to these requests. With the exception of such material, publicly available docket materials are available electronically in <E T="03">Regulations.gov</E> . <E T="03">Written Comments.</E> Submit your comments, identified by Docket ID No. EPA-HQ-OAR-2024-0419, at <E T="03">https://www.regulations.gov</E> (our preferred method), or the other methods identified in the <E T="02">ADDRESSES</E> section. Once submitted, comments cannot be edited or removed from the docket. The EPA may publish any comment received to its public docket. Do not submit to EPA's docket at <E T="03">https://www.regulations.gov</E> any information you consider to be CBI or other information whose disclosure is restricted by statute. This type of information should be submitted as discussed in the <E T="03">Submitting CBI</E> section of this document. Multimedia submissions (audi ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Preview showing 10k of 393k characters. Full document text is stored and available for version comparison. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━