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    Complyrpedia is the knowledge base for businesses that are required to comply with California environmental regulations

Stationary Emergency Diesel Engines

Stationary Emergency Diesel Engines ICON


Stationary diesel-powered emergency generators over 50 hp located in California are regulated by the California Air Resources Board and your local air district. The main pollutant of concern, as with all with diesel driven devices, is ultra fine diesel particulate matter.

Regulatory Agencies

Program Inclusion Conditions

Operation of a diesel-powered emergency engine with >50 bhp in California. Non-emergency engines are also regulated. However, the requirements are different and are not supported by Complyrs.

Required Tasks


What to Expect During an Inspection

Stationary emergency diesel engines are regulated and inspected by  the local air district. Air district  inspectors typically conduct inspections unannounced which usually involve the following:

  • Check that the permit is current.
  • Verify hour meter matches most recent log entry.
  • Review of operation since last agency inspection.
  • Verify testing and maintenance operation does not exceed allotment according to state regulations or permit conditions.
  • Verify annual maintenance has been conducted.
  • Verify use of ultra-low-sulfur diesel fuel.
  • Verify that operations and maintenance manual FOR THE ENGINE is available.

Related Programs


California Air Resources Board: Stationary Diesel Engine ATCM

Air Pollution Control District: Breakdown Condition Information

Final Regulation Order: Amendments to the Airborne Toxic Control Measures for Stationary Compression Ignition Engines

California Local Air District Directory

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