Diesel fuel generator - Hours of operation

Download the diesel fuel generator operating hours calculator to help you estimate releases of National Pollutant Release Inventory (NPRI) substances.

Diesel-powered reciprocating engine generators (up to 600 horsepower) release Part 1, 2, 4 and 5 Substances. This release calculator uses default emission factors and can be adapted to use site-specific emission factors. If you want to use a site-specific emission factor, enter it in the emission factor column, but be sure to convert the units correctly. 

The spreadsheet calculators use emission factors based on uncontrolled emission sources. If you use an emission control device and the default emission factor is uncontrolled, use this formula to adjust the spreadsheet calculation:

Controlled emissions = uncontrolled emission x ((100 - control efficiency)/100)

Since NPRI reporting thresholds are for the facility as a whole, you may need to combine the air releases you calculate with releases from other sources at your facility.

The following sections explain how the spreadsheet calculator works.

Suggested estimation methodology: emission factor

The equation for estimation using an emission factor is:

E = A x EF

where:

  • E = emissions
  • A = activity rate
  • EF = emission factor

Input data

B = hours of operation [hours]
C = operating horsepower [hp]

Calculate the activity rate by the following formula:

A = B x C

Use the emission factors in the tables below to calculate the emissions for each substance.

Substance releases

Part 1 releases
Substance Chemical Abstracts Service registry number (CAS RN)1 Part Emission factor (EF)2 EF units
Acetaldehyde 75-07-0 1A 2.435E-06 kg/hp - hour
Acrolein 107-08-8 1A 1.469E-07 kg/hp - hour
Anthracene 120-12-7 1A 5.938E-09 kg/hp - hour
Benzene 71-43-2 1A 2.962E-06 kg/hp - hour
1,3-butadiene 106-99-0 1A 6.207E-08 kg/hp - hour
Formaldehyde 50-00-0 1A 3.747E-06 kg/hp - hour
Naphthalene 91-20-3 1A 2.693E-07 kg/hp - hour
Propylene 115-07-1 1A 8.192E-06 kg/hp - hour
Toluene 108-88-3 1A 1.299E-06 kg/hp - hour
Isomers of xylene 1330-20-7 1A 9.049E-07 kg/hp - hour
Mercury 7439-97-6 1B 9.570E-10 kg/hp - hour
Part 2 releases
Substance Chemical Abstracts Service registry number (CAS RN)1 Emission factor (EF)2 EF units
Acenaphthene 83-32-9 2.254E-09 kg/hp - hour
Acenaphthylene 208-96-8 8.033E-09 kg/hp - hour
Benzo (a) anthracene 56-55-3 5.334E-09 kg/hp - hour
Benzo (a) phenanthrene 218-01-9 1.121E-09 kg/hp - hour
Benzo (a) pyrene 50-32-8 2.985E-10 kg/hp - hour
Benzo (b) fluoranthene 205-99-2 1.573E-10 kg/hp - hour
Benzo (g,h,i) perylene 191-24-2 7.763E-10 kg/hp - hour
Benzo (k) fluoranthene 207-08-9 2.461E-10 kg/hp - hour
Dibenzo (a,h) anthracene 53-70-3 9.256E-10 kg/hp - hour
Fluoranthene 206-44-0 2.416E-08 kg/hp - hour
Fluorene 86-73-7 9.271E-08 kg/hp - hour
Indeno(1,2,3-c,d) pyrene 193-39-5 5.953E-10 kg/hp - hour
Phenanthrene 85-01-8 9.335E-08 kg/hp - hour
Pyrene 129-00-0 1.518E-08 kg/hp - hour
Part 4 criteria air contaminants (CAC) releases
Substance Chemical Abstracts Service registry number (CAS RN)1 Emission factor (EF)2 EF units
Carbon monoxide (CO) 630-08-0 3.029E-03 kg/hp - hour
Sulphur dioxide (SO2) 7446-09-5 9.294E-04 kg/hp - hour
Oxides of nitrogen (NOx), expressed as nitrogen dioxide (NO2) 11104-93-1 1.405E-02 kg/hp - hour
Volatile organic compounds (VOCs) * 1.120E-03 kg/hp - hour
Total particulate matter (TPM) * 9.974E-04 kg/hp - hour
Particulate matter less than or equal to 10 micrometers (µm) (PM10) * 9.974E-04 kg/hp - hour
Particulate matter less than or equal to 2.5 µm (PM2.5) * 9.974E-04 kg/hp - hour
Part 5 releases
Substance Chemical Abstracts Service registry number (CAS RN)1 Emission factor (EF)(2) EF units
Benzene 71-43-2 2.962E-06 kg/hp - hour
1,3-butadiene 106-99-0 6.207E-08 kg/hp - hour
Formaldehyde 50-00-0 3.747E-06 kg/hp - hour
Propylene 115-07-1 8.192E-06 kg/hp - hour
Toluene 108-88-3 1.299E-06 kg/hp - hour
Isomers of xylene 1330-20-7 9.049E-07 kg/hp - hour
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