New Source Performance Standards for Stationary Spark Ignition Internal Combustion Engines
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Rule Summary
Stationary engines use pistons that alternately move back and forth to convert pressure into rotating motion. They are used in a variety of applications from generating electricity to powering pumps and compressors in power and manufacturing plants. They are also used in the event of an emergency such as fire or flood.
A spark ignition (SI) engine, or gasoline engine, is a type of engine in which the fuel-air mixture in the combustion chamber is ignited by a spark from a spark plug.
The key pollutants EPA regulates from these sources includes nitrogen oxides (NOx), carbon monoxide (CO), and volatile organic compounds (VOC).
The New Source Performance Standards (NSPS) for Stationary Spark Ignition Internal Combustion Engines is outlined in the Code of Federal Regulations under 40 CFR Part 60 Subpart JJJJ.
Rule History
The following is a timeline of regulatory actions that have formed the current regulation:
08/30/2024 - Final Rule - August 30, 2024 (pdf) (450 KB)
06/26/2023 - Proposed Rule - June 26, 2023
08/10/2022 - Final Rule - August 10, 2022 (pdf) (269 KB)
08/15/2014 - Notice of final decision on reconsideration (pdf) (201 KB)
09/05/2013 - Notice of reconsideration (pdf) (218 KB)
01/30/2013 - Final amendments (pdf) (515 KB)
10/03/2012 - Reopening of comment period (pdf) (214 KB)
06/21/2012 - Notice of public hearing and extension of comment period (pdf) (195 KB)
06/07/2012 - Proposed rule - June 07, 2012 (pdf) (519 KB)
06/28/2011 - Final amendments to the NSPS for CI and SI internal combustion engines
- Final rule - June 28, 2011 (pdf) (236 KB)
- Proposed rule - June 8, 2010 (pdf) (228 KB)
01/18/2008 - Final rule - January 18, 2008 (pdf) (338 KB)
06/12/2006 - Proposed rule - January 12, 2006 (pdf) (349 KB)