The text below describes how to enter subpart D Electricity Generation emissions information for each unit at your facility. The process to edit an existing unit is essentially similar.

Adding or Updating Unit Emissions Information

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Starting on the Subpart D Overview page, find the unit for which you would like to enter emissions information in the SOURCE SUMMARY table and click OPEN.

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To edit the configuration information for this unit or group, click the “Edit this Unit or Group Information link above the UNIT/STACK/PIPE EMISSIONS INFORMATION table.

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Use the text boxes, drop-down menu, and radio buttons to update the entered information.

When finished, click SAVE.

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To enter emissions information for this configuration, find the UNIT/STACK/PIPE EMISSIONS INFORMATION table and click OPEN.

The unit emissions data entry screen will vary slightly depending on the Part 75 methodology selected for each unit.

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For each unit, subpart D requires the facility to provide the following aggregated fuel emissions data:

• The total annual CO₂ emissions at the monitored location in short tons (as reported in part 75) [98.36(d)(1)(ii)]
• The total annual CO₂ emissions at the monitored location in metric tons (conversion from the short ton value reported in part 75) [98.36(d)(1)(ii)]
• The total annual biogenic CO₂ emissions. This includes both CO₂ emissions from the combustion of biomass fuels and the biogenic portion of CO₂ emissions from fuels with a mixed biogenic and fossil component [98.36(d)(1)(ix)]

For each unit for which the facility selects "CEMS" as the Part 75 methodology used to determine CO₂ mass emissions, subpart D requires the facility to provide the following additional information [98.3(c)(8)]:

• The total number of operating hours during the year that CO₂ concentration was missing
• The total number of operating hours during the year that stack gas flow rate was missing
• The total number of operating hours during the year that moisture content was missing (only if a continuous moisture monitor was in use)

For each unit for which the facility selects "Appendix G, Equation G-1" as the Part 75 methodology used to determine CO₂ mass emissions, subpart D requires the facility to provide the following additional information [98.3(c)(8)]:

• The total number of operating hours during the year that fuel carbon content was missing

For each unit for which the facility selects "Appendix G, Equation G-4" as the Part 75 methodology used to determine CO₂ mass emissions, subpart D requires the facility to provide the following additional information [98.3(c)(8)]:

• The total number of operating hours during the year that fuel flow rate was missing
• The total number of operating hours during the year that high heating value was missing

For each unit for which the facility selects "LME calculation methods in §75.19(c)(4)(iii)" as the Part 75 methodology used to determine CO₂ mass emissions, no additional information is required.

Use the text boxes to enter the required information.

When finished, click SAVE.

Once you have entered the required unit emissions information for all units and groups at your facility, you will have finished entering the required unit emissions information for your facility.

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See Also

Screen Errors
Using e-GGRT to Prepare Your Subpart D Report
Subpart D Unit Information
Subpart D Fuel Information
Subpart D Fuel Emissions Information
Subpart Validation Report