Stationary Reciprocating Internal Combustion Engines

Determining applicable requirements for stationary engines can be complex and confusing. If you have questions about the requirements for a specific stationary engine, contact Air Licensing staff at (207) 287-7688 or email DEPAirLicensing-Help@maine.gov. The following information will help us determine the applicable requirements for your specific engine.

• Engine make, model, and size;
• Date of manufacture;
• Fuel burned in the unit;
• Will it be used for emergency purposes only or for prime power; and
• Will it be used in any kind of demand response program.

Maine DEP Rules

• 06-096 C.M.R. ch. 148, Emissions from Smaller-Scale Electric Generating Resources (Word)
• 06-096 C.M.R. ch. 169, Stationary Generators

Federal Regulations

• 40 C.F.R. Part 60, Subpart IIII, Standards of Performance for Stationary Compression Ignition Internal Combustion Engines
• 40 C.F.R. Part 63, Subpart JJJJ, Standards of Performance for Stationary Spark Ignition Internal Combustion Engines.
• 40 C.F.R. Part 63, Subpart ZZZZ, National Emissions Standards for Hazardous Air Pollutants for Stationary Reciprocating Internal Combustion Engines

Guidance and Resources

• EPA website on Controlling Pollution from Stationary Engines
• Small Stationary Reciprocating Internal Combustion Engines (RICE) (.docx) - Guidance on requirements for stationary engines smaller than licensing thresholds.
• Policy on Including Portable Engines in Applications (.pdf) - When to include portable engines in Air Emission License applications.
• QAISA Guidance (.docx) - When and how to submit a Qualitative Ambient Impact Screening Analysis (QAISA) pursuant to Chapter 169.
• Modeling Guidance (.pdf) - When to exempt stationary internal combustion engines from a modeling analysis if used for maintenance, stand-by, or emergency use.
• Mineral Processing Industry Engines (.pdf) – Article on the difference between stationary and portable engines.

Smaller-Scale Electric Generating Resources Registration

Engines subject to Chapter 148 may be registered but sending a completed registration form to:

DEPARTMENT OF ENVIRONMENTAL PROTECTION
Air Quality
17 State House Station
Augusta, Maine 04333-0017