New Source Performance Standards for Stationary Compression 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 compression ignition (CI) engine, or diesel engine, is a type of engine in which the fuel injected into the combustion chamber is ignited by a heat resulting from the compression of gases inside the cylinder.
The key pollutants EPA regulates from these sources includes nitrogen oxide (NOx), particulate matter (PM), sulfur dioxide (SO2), carbon monoxide (CO), and hydrocarbons (HC) .
The New Source Performance Standards (NSPS) for Stationary Compression Ignition Internal Combustion Engines is outlined in the Code of Federal Regulations under 40 CFR Part 60 Subpart IIII.
Rule History
The following is a time line of the regulatory actions that have formed the current regulations:
- August 16, 2024
- Final Rule (pdf) (Pre-publication Version)
- June 26, 2023
- August 10, 2022
- November 13, 2019
- July 5, 2019
- July 7, 2016
- November 6, 2015
- August 15, 2014
- September 5, 2013
- January 30, 2013
- October 3, 2012
- June 21, 2012
- June 7, 2012
- June 28, 2011 - final amendments to the NSPS for CI internal combustion engines
- July 11, 2006 - NSPS for CI internal combustion engines
Additional Resources
- Technical Documents
- Fact Sheets
- Implementation Tools
- Report to Congress - Remote Areas of Alaska: Affordable and Reliable Options for Meeting Energy Needs and Reducing Emissions