# 2026-00677: EPA Revamps Rules to Tame Nitrogen Oxides from Gas Turbines

2026-00677, New Source Performance Standards Review for Stationary Combustion Turbines and Stationary Gas Turbines, is a Federal Register rule from Environmental Protection Agency published 2026-01-15, effective 2026-01-15; deemed significant under Executive Order 12866 (as of 2026-06-11).

- Canonical: https://policyrisk.com/federal-register/2026-00677
- As of: 2026-06-11
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Document number: 2026-00677
- Title: New Source Performance Standards Review for Stationary Combustion Turbines and Stationary Gas Turbines
- Type: Rule
- Agencies: Environmental Protection Agency
- Citation: 91 FR 1910
- Published: 2026-01-15
- Effective: 2026-01-15
- Comments close: not stated
- Significant: yes (FR_METADATA)
- Touches household money: no
- Regulation identifier numbers: 2060-AW21
- Last updated: 2026-06-11

## In one line

EPA Revamps Rules to Tame Nitrogen Oxides from Gas Turbines

## Summary

The EPA is updating rules for stationary combustion and gas turbines to cut pollution, especially nitrogen oxides (NOX). These changes affect new, modified, or rebuilt turbines, grouping them by size, fuel, and use, and set clearer pollution controls. The new rules kick in January 15, 2026, and some small or temporary turbines get easier requirements, helping businesses save money while keeping the air cleaner.

## Abstract

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 (NO<INF>X</INF>) emissions for most new, modified, or reconstructed stationary combustion turbines. For one subcategory, the BSER for NO<INF>X</INF> is combustion controls with the addition of selective catalytic reduction (SCR). The EPA further determined that the BSER for sulfur dioxide (SO<INF>2</INF>) 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.

## Effects PRIA read

- New NSPS Apply to Recent Turbine Projects: cost, medium. The EPA’s final rule creates a new NSPS subpart (KKKKa) that applies to stationary combustion turbines and stationary gas turbines that began construction, modification, or reconstruction after December 13, 2024. The final rule is effective January 15, 2026, so turbines that started those activitie…
- Turbines Grouped into Size/Use Subcategories: mixed, medium. The EPA is establishing subcategories for new, modified, or reconstructed stationary combustion turbines based on size, rates of utilization, design efficiency, and fuel type. This means owners/operators will face different emission control requirements depending on which subcategory their turbine…
- NOX Controls: Combustion Controls; SCR for One Group: cost, medium. The EPA determined that combustion controls are the best system of emission reduction (BSER) for NOX for most new, modified, or reconstructed stationary combustion turbines. For one specific subcategory, the EPA determined BSER is combustion controls with the addition of selective catalytic reducti…
- Easier Rules for Temporary and Small Turbines: benefit, medium. The EPA added a subcategory for stationary combustion turbines used in temporary applications and is exempting certain sources from title V permit requirements. The preamble says some small or temporary turbines get easier requirements, which can reduce compliance costs for those businesses.

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## Sources
- [2026-00677 on federalregister.gov](https://www.federalregister.gov/documents/2026/01/15/2026-00677/new-source-performance-standards-review-for-stationary-combustion-turbines-and-stationary-gas)
- [2026-00677 as published (PDF)](https://www.govinfo.gov/content/pkg/FR-2026-01-15/pdf/2026-00677.pdf)

## Related
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- [All Federal Register documents](https://policyrisk.com/federal-register)

Source: PRIA, https://policyrisk.com/federal-register/2026-00677 (as of 2026-06-11).