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Once the stationary source fuel usage (in gallons or cubic feet) is determined (via fuel records or estimated via manufacturer specifications), the appropriate emissions factors (shown in Table C­ 4 , GHG Emission Factors for Stationary Sources ) can be applied to determine the CO$_{2}$, CH$_{4}$, and N$_{2}$O emissions (in metric tons). 

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The CO$_{2}$, CH$_{4}$, and N$_{2}$O emissions should then be adjusted to account for GWP with a result of CO$_{2e }$(in metric tons). Equation C-12 ( CO$_{2e }$Emission Calculation for Boiler using Natural Gas ) provides an example for natural gas usage within a boiler. 

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## C.2.6 Electrical Usage 

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The following section discusses the methodologies for computing GHG emissions from electrical consumption at airports. With electricity usage generally reported in kilowatt hours (kWh), emission factors (in pounds per MWh or pounds per GWh) from local utility providers, Emissions & Generation Resource Integrated Database (eGRID) 67 , or U.S. Energy Information Administration (EIA) for specific regions of the country should be used to calculate emissions. These emission factors are a function of the type of fuel/process used to generate the electricity in a particular region. Once the electrical consumption is determined, the appropriate emissions factors can be applied to determine the CO$_{2}$, CH$_{4}$, and N$_{2}$O emissions. 

