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HOMER Pro 3.9

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Generator Carbon Monoxide Emissions Factor

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Input Variable


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



The amount of carbon monoxide emitted per unit fuel consumed by the generator. Because carbon monoxide is a product of incomplete combustion, the quantity produced will depend on the fuel, engine design, and operating conditions, including the power output of the generator. But HOMER makes a simplifying assumption that this factor is constant.

The following graph shows the value of the carbon monoxide emissions factor for diesel generators in the size range 50 kW - 450 kW. The source of these data is an internal NREL report by Erin Kassoy entitled "Modeling diesel exhaust emissions in diesel retrofits". The default value for the generator CO emissions factor is equal to the average value between 50% and 100% load.


HOMER uses this value to calculate the emissions of carbon monoxide and carbon dioxide. For details, see the article on How HOMER Calculates Emissions.