United States of America is reviewing performance standards for stationary combustion turbines and stationary gas turbines to ensure efficient and clean energy production from stationary power generation systems.
US Reviews Clean Energy Standards for Stationary Turbines
Performance standards review targets gas and combustion turbines for power generation.
What changed
Performance standards under review for stationary combustion and gas turbines.
HS codes explicitly targeted including 841182, 841199, and 841181.
Alignment with environmental goals to ensure efficient and clean energy production.
Who it affects
Importers of stationary turbines must verify if their goods fall under the listed HS codes.
Regulation Analysis: Updated Performance Standards for Stationary Combustion Turbines and Stationary Gas Turbines in the U.S.
The U.S. Environmental Protection Agency (EPA) has finalized amendments to the New Source Performance Standards (NSPS) for stationary combustion turbines and stationary gas turbines under the Clean Air Act (CAA). These amendments establish subcategories based on turbine characteristics and mandate specific emission control technologies as the Best System of Emission Reduction (BSER) for nitrogen oxides (NOₓ) and sulfur dioxide (SO₂). The rule became effective on 15 January 2026, with technical corrections published on 17 August 2026.
Key Requirements and Subcategories
The EPA’s final rule introduces subcategories for stationary combustion turbines, each subject to distinct performance standards. Below is a summary of the regulatory framework:
| Regulation | Key Requirement | Deadline/Threshold | Authority |
|---|---|---|---|
| Subcategorization of Stationary Combustion Turbines1 | Turbines are sub categorized by size, utilization rate, design efficiency, and fuel type. Temporary-use turbines are exempt from certain provisions. | Effective 15 January 20261 | 40 CFR Part 60 (New Subpart)1 |
| NOₓ Emission Standards (BSER)1 | Combustion controls are the BSER for most turbines. For one subcategory, combustion controls + Selective Catalytic Reduction (SCR) are required. | Effective 15 January 20261 | EPA under CAA §1111 |
| SO₂ Emission Standards (BSER)1 | No change from prior NSPS; existing SO₂ controls remain the BSER. | Effective 15 January 20261 | EPA under CAA §1111 |
| Title V Exemptions1 | Certain sources (e.g., temporary-use turbines) are exempt from Title V permitting requirements. | Effective 15 January 20261 | 40 CFR Part 70/711 |
| Technical Corrections2 | Inadvertent errors in the 15 January 2026 Federal Register (e.g., typographical, regulatory text) were corrected. | Effective 17 August 20262 | 91 FR 435612 |
Detailed Provisions
1. Subcategorization of Turbines1
The EPA now classifies stationary combustion turbines into subcategories based on:
- Size (e.g., output capacity thresholds).
- Utilization rate (e.g., baseload vs. peaking units).
- Design efficiency (e.g., heat rate or thermal efficiency).
- Fuel type (e.g., natural gas, distillate oil, or other fuels).
- Temporary applications (e.g., emergency backup or short-term use), which are subject to separate provisions.
2. NOₓ Emission Standards1
- For most subcategories, the BSER for NOₓ is combustion controls (e.g., lean-premix combustion, water/steam injection).
- For one subcategory (likely larger or higher-utilization turbines), the BSER is combustion controls + SCR, a post-combustion control technology.
- The EPA determined these controls represent the most cost-effective and achievable emission reduction methods.
3. SO₂ Emission Standards1
- The BSER for SO₂ remains unchanged from prior NSPS reviews. No new control technologies or subcategories were introduced for SO₂.
4. Title V Permitting Exemptions1
- Certain stationary combustion turbines (e.g., those used in temporary applications) are exempt from Title V operating permit requirements under 40 CFR Parts 70 and 71.
- This exemption reduces administrative burdens for short-term or low-utilization sources.
5. Technical Corrections2
- The EPA published a corrigendum on 16 July 2026 to address inadvertent errors in the original 15 January 2026 Federal Register notice (e.g., typographical mistakes, incorrect regulatory text).
- The corrections became effective on 17 August 2026 and are codified in 91 FR 43561.
Compliance Timeline
- 15 January 2026: Final rule published and effective1.
- 17 August 2026: Technical corrections published and effective2.
Summary Answer
The EPA’s 2026 NSPS amendments for stationary combustion turbines establish subcategories based on size, utilization, efficiency, and fuel type, with tailored NOₓ emission standards (combustion controls ± SCR) and unchanged SO₂ standards1. Temporary-use turbines are exempt from Title V permitting1, and technical corrections were issued on 17 August 2026 to address errors in the original rule2. The rule is codified in 40 CFR Part 60 and applies to new, modified, or reconstructed turbines as of 15 January 20261. For full details, refer to Docket EPA-HQ-OAR-2024-04192, 1.
Sources
- ↩ New Source Performance Standards Review for Stationary Combustion Turbines and Stationary Gas Turbines> https://docs.wto.org/imrd/directdoc.asp?DDFDocuments/T/G/TBTN24/USA2170A2.docx
- ↩ New Source Performance Standards Review for Stationary Combustion Turbines and Stationary Gas Turbines https://docs.wto.org/imrd/directdoc.asp?DDFDocuments/T/G/TBTN24/USA2170A2C1.docx