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).  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.  CO$_{2 }$(metric tons)  = Fuel Usage (cubic feet) x 120.372 pounds CO$_{2 }$per cubic feet x short ton per 2,000  pound x 0.907185 metric ton per short ton  CH$_{4 }$(metric tons)  = Fuel Usage (cubic feet) x 0.000534 pounds CH$_{4 }$per cubic feet x short ton per  2,000 pound x 0.907185 metric ton per short ton  N$_{2}$O (metric tons)  = Fuel Usage (cubic feet) x 0.0002 pounds N$_{2}$O per cubic feet x short ton per 2,000  pound x 0.907185 metric ton per short ton  CO$_{2e }$(in metric tons) = CO$_{2 }$+ CH$_{4 }$x 34 + N$_{2}$O x 298  Equation C-12. CO$_{2e }$Emission Calculation for Boiler using Natural Gas  C.2.6 Electrical Usage  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.  67 EPA,  Emissions & Generation Resource Integrated Database  (eGRID),  http://www.epa.gov/cleanenergy/energy-resources/egrid/index.html.  71$_{ }$ Fuel  CO$_{2 }$ N$_{2}$O  CH$_{4 }$ Units  Natural Gas  120.372  0.0002  0.0002  lb/1000cf  No 2 Oil  22.384  0.0001928  0.000534  lb/gallon  No 6 Oil  26.033  0.0002081  0.0002245  Diesel  22.377  0.00057  0.00128  lb/gallon  Gasoline  19.643  0.00049  0.00110  Tekflame  12.669  0.00000023  0.000003  lb/gallon  Source: Department of Energy, Energy Information Administration, 2012, Reporting of Greenhouse Gases Emissions.  Table C-4. GHG Emission Factors for Stationary Sources  APPENDIX C$_{ }$