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HOMER Pro 3.10

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Generator Nitrogen Oxides Emissions Factor

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Input Variable


grams per unit fuel (fuel units can be L, m3, or kg)



The amount of nitrogen oxides emitted per unit of fuel consumed by the generator. The actual quantity of this pollutant produced by the generator depends on engine design and operating conditions, primarily the power output of the generator. For simplicity, HOMER assumes this factor is constant.

The following graph shows the value of the nitrogen oxides emissions factor for 50-kW–450-kW diesel generators. The source of these data is an unpublished NREL report by Erin Kassoy entitled "Modeling diesel exhaust emissions in diesel retrofits." HOMER's default value for the generator's nitrogen oxides emissions factor is equal to the average value between 50% and 100% load.


HOMER uses this value to calculate the emissions of nitrogen oxides. For details, see the How HOMER Calculates Emissions section of the help.