WTO notification · TBT
United StatesAdopted, according to its latest notice
Official title
Review of New Source Performance Standards for Stationary Combustion Turbines and Stationary Gas Turbines
The United States issued a correction on 17 July 2026 to the earlier TBT notification G/TBT/N/USA/2170. The measure was first notified on 17 December 2024. The comment period closed on 15 April 2025.
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Stationary combustion turbines and stationary gas turbines; Air quality; Internal combustion engines; Gas and steam turbines. Steam engines; Rotating machinery
Proposed rule - 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 (NOX) 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 NOX 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 NOX emissions as sources firing natural gas or non-natural gas…
Every notice about this measure published here, newest first. Each one is the notifying member's own text.
CorrigendumG/TBT/N/USA/2170/Add.2/Corr.1
New Source Performance Standards Review for Stationary Combustion Turbines and Stationary Gas Turbines
The U.S. Environmental Protection Agency (EPA) is making corrections to the New Source Performance Standards Review for Stationary Combustion Turbines and Stationary Gas Turbines final rule ('Final NSPS Rule'') that published in the Federal Register (FR) on 15 January 2026 (notified as G/TBT/N/USA/2170/Add.2), and became effective on 15 January 2026. After publication, the EPA identified inadvertent technical and typographical errors in the Federal Register regulatory text and is correcting those errors. Effective on 17 August 2026. 91 Federal Register (FR) 43561, 16 July 2026; Title 40 Code of Federal Regulations (CFR) Part 60: This action and previous actions notified under the symbol G/TBT/N/USA/2170 are identified by Docket Number EPA-HQ-OAR-2024-0419. The Docket Folder is available on Regulations.gov at and provides access to primary and supporting documents as well as comments received. Documents are also accessible from Regulations.gov by searching the Docket Number.
AddendumG/TBT/N/USA/2170/Add.2
New Source Performance Standards Review for Stationary Combustion Turbines and Stationary Gas Turbines
The U.S. Environmental Protection Agency (EPA, or Agency) is finalizing amendments to the new source performance standards (NSPS) for stationary combustion turbines and stationary gas turbines pursuant to a review required by the Clean Air Act (CAA). As a result of this review, the EPA is establishing subcategories for new, modified, or reconstructed stationary combustion turbines based on size, rates of utilization, design efficiency, and fuel type. The EPA determined that combustion controls are the best system of emission reduction (BSER) for nitrogen oxide (NOX) emissions for most new, modified, or reconstructed stationary combustion turbines. For one subcategory, the BSER for NOX is combustion controls with the addition of selective catalytic reduction (SCR). The EPA further determined that the BSER for sulfur dioxide (SO2) emissions has not changed since the last NSPS review. Based on these determinations, the Agency is promulgating standards of performance in a new subpart of the Code of Federal Regulations (CFR). The Agency is also adding a subcategory for stationary combustion turbines that are used in temporary applications, exempting certain sources from title V requirements, and finalizing other provisions. The EPA is finalizing amendments to existing regulations to address or clarify specific technical and editorial issues. This final rule is effective on 15 January 2026. The incorporation by reference of certain publications listed in the rule is approved by…
AddendumG/TBT/N/USA/2170/Add.1
Comment deadline: Closed on 15 April 2025
Review of New Source Performance Standards for Stationary Combustion Turbines and Stationary Gas Turbines; Reopening of Comment Period
On 13 December 2024, the U.S. Environmental Protection Agency (EPA) proposed amendments to the new source performance standards (NSPS) for new, modified, and reconstructed stationary combustion turbines and stationary gas turbines. The EPA is reopening the public comment period for this proposed rule (notified as G/TBT/N/USA/2170) to allow additional time for stakeholders to review and comment on the proposal. The initial 90-day public comment period, which ended 13 March 2025, is being reopened for an additional 21 days, from 25 March 2025 to 15 April 2025. The comment period for the proposed rule published on 13 December 2024, at 89 FR 101306, is reopened. Comments must be received on or before 15 April 2025. 90 Federal Register (FR) 13576, 25 March 2025; Title 40 Code of Federal Regulations (CFR) Part 60: This reopening of comment period and the proposed rule notified as G/TBT/N/USA/2170 are identified by Docket Number EPA-HQ-OAR-2024-0419. The Docket Folder is available on Regulations.gov at and provides access to primary and supporting documents as well as comments received. Documents are also accessible from Regulations.gov by searching the Docket Number. WTO Members and their stakeholders are asked to submit comments to the USA TBT Enquiry Point. Comments received by the USA TBT Enquiry Point from WTO Members and their stakeholders by 4pm Eastern Time on 15 April 2025 will be shared with EPA and will also be submitted to the Docket on Regulations.gov if received…
Regular notificationG/TBT/N/USA/2170
Comment deadline: Closed on 13 March 2025
Review of New Source Performance Standards for Stationary Combustion Turbines and Stationary Gas Turbines
Proposed rule - 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 (NOX) 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 NOX 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 NOX emissions as sources firing natural gas or non-natural gas…
Expodite writes its summary from the official record. The notification and the documents it notifies are on the WTO's own websites.
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