When imputing missing CEMS emissions data, we use a fuel-specific emission rate based on the fuel type identified in the power sector data crosswalk. However there is a chance that these assigned values are incorrect or at least represent the primary fuel type for a multi-fuel plant. A more robust approach could be to calculate a month-specific weighed average emission factor based on the proportion of each type of fuel actually burned in that unit in a given month (as reported in EIA923), assuming that there is a 1:1 or 1:m mapping between the EPA unit and the EIA boiler/generator.
grgmiller
commented
1 year ago
When imputing missing CEMS emissions data, we use a fuel-specific emission rate based on the fuel type identified in the power sector data crosswalk. However there is a chance that these assigned values are incorrect or at least represent the primary fuel type for a multi-fuel plant. A more robust approach could be to calculate a month-specific weighed average emission factor based on the proportion of each type of fuel actually burned in that unit in a given month (as reported in EIA923), assuming that there is a 1:1 or 1:m mapping between the EPA unit and the EIA boiler/generator.