Internal Combustion Engines - Generators
If you plan to install or operate any kind of diesel fired stationary or portable engine greater than 50 horsepower within the 3 counties of this Air District, then you will need to obtain a Permit to Operate.
All generators, regardless of fuel type, emit toxic gases in their exhaust. Always operate any combustion source in a well-ventilated environment. Follow ALL of the manufacturer's safety precaustions.
No, we actually permit the engine that powers the generator. Knowing the manufacturer, model, year, etc. is important for filling out your supplemental form.
To convert power from kilowatts (kW) to horsepower (HP), multiply the power value in kW by 1.34102.
FORMULA: (kW) x (1.34102) = Horsepower value
For instance, if an engine has a power output of 75 kW, the equivalent in horsepower would be approximately 100.5765 HP.
No permit to operate is needed.
Yes, if it is a prime power. Tier 4 final or tier 4 will be expected.
No, if it is for emergency use. No tier restriction.
Two forms are needed to be submitted to deem the application process potentially complete with the filing fee payment:
- Permit Application Form
- Internal Combustion Engine Supplemental Form
- Rule 603(A)(1)(a) Stationary Source, Filing Fee ( Please contact the district first before paying.)
- Optional: Emissions, manufacturer data sheet, EPA family certification, etc. (This all helps process your application faster)
The Air Resources Board adopted an air toxic control measure (ATCM) for stationary diesel engines. Each local air district implements the ATCM.

