This topic provides a step-by-step description of how to add a subpart C Stationary Fuel Combustion Sources configuration for a facility.

For stationary combustion sources required to report under subpart C, Cal e-GGRT requires you to identify which reporting option each unit or group of units will be using to report emissions. The different subpart C reporting options are referred to as “Configurations” in Cal e-GGRT. The individual configurations are designed to match the reporting options made available by the rule in 40 CFR 98.36. As specified in part 98, each configuration has slightly different reporting requirements. Once a configuration is added, Cal e-GGRT will allow you to enter the required reporting elements for the configuration type selected. A facility may have multiple configuration types and/or multiple configurations of any given type. A single unit may not be reported under multiple configurations.

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Starting on the Subpart C Overview page, click the link titled "ADD a Configuration" below the CONFIGURATION SUMMARY table.

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The unit or group configuration types are first briefly identified below with the relevant regulatory citation, and then again in more detail:

• Configuration Type 1 - A single unit using Tiers 1, 2 or 3 to calculate emissions [98.36(b)]
• Configuration Type 2 - A single unit using Tier 4 (CEMS) to calculate emissions [98.36(b)]
• Configuration Type 3 - A group of units using the aggregation of units reporting alternative [98.36(c)(1)]
• Configuration Type 4 - A group of units using the common pipe configurations reporting alternative [98.36(c)(3)]
• Configuration Type 5 - A group of units using Tier 4 (CEMS) to calculate emissions and reporting under the monitored common stack or duct configurations reporting alternative [98.36(c)(2)]
• Configuration Type 6 – Part 75 units using the alternative CO₂ mass emissions calculation methods provided in 98.33(a)(5) [98.36(d)(2)]

Configuration Type 1 - Single Unit Using Tiers 1, 2, or 3 [98.36(b)]

The single unit reporting configuration is the most basic configuration type. Any unit may be reported individually in Cal e-GGRT. If the unit uses Tiers 1, 2, or 3 to calculate CO₂ emissions, it must be reported as a configuration of Type 1. If the use of Tier 4 is required or elected, Configuration Type 2 or 5 must be used.

A unit under Configuration Type 1 may combust multiple fuels, and it is possible for the different fuels to be using different tiers. For example, a unit that is 500 mmBtu/hr in size may be required to use Tier 3 for coal, but only Tier 2 for natural gas or fuel oil.

Facilities with numerous units should investigate if Configuration Type 3 (aggregation of units) or Type 4 (common pipe) may be used.

Configuration Type 2 – Single Unit Using Tier 4 [98.36(b)]

Configuration Type 2 is the reporting option for single units that are either required, or elect to use Tier 4 (CEMS). CO₂ emissions will be reported for all fuels combined, but CH₄ and N₂O emissions will still need to be reported on a fuel by fuel basis.

Should a unit change methodology from Tiers 1-3 to Tier 4 during the year, the unit will need to be added as two separate configurations in Cal e-GGRT with different configuration names.

If a single CEMS is used to monitor multiple units (multiple combustion, or one combustion and one or more process units), Configuration Type 5 should be used instead.

Configuration Type 3 – Aggregation of Units [98.36(c)(1)]

The aggregation of units option is a reporting configuration that allows multiple units to be reported as a single entity, provided that certain conditions are met. If this reporting option is selected, emissions from all units grouped in this configuration will be reported as combined emissions in Cal e-GGRT.

If a facility contains two or more units, each of which has a maximum rated heat input capacity of 250 mmBtu/hr or less, you may report these units as a single reporting configuration of Type 3 in Cal e-GGRT, provided that only Tiers 1-3 are used and the units use the same tier for any common fuels combusted. Fuels of different types may use different tiers, as permitted. There is no limit on the number of units that may be included in this configuration provided the previous criteria are met.

While the use of Tier 3 is permitted to be used in an aggregation of units configuration, it is generally not required for configurations of this type as Tier 3 is only required for certain units larger than 250 mmBtu/hr. Units of that size may not be included in the aggregation of units configuration.

Configuration Type 4 – Common Pipe [98.36(c)(3)]

The common pipe reporting configuration is another alternative reporting option that allows for multiple units to be reported as a single group entry.

This configuration is different from the aggregation of units configuration in that there is no size constraint. The common pipe configuration may only be used if two or more stationary combustion units at a facility combust the same type of liquid or gaseous fuel and the fuel is fed to the individual units through a common supply line or pipe.

The common pipe configuration may only be used if the units only combust the liquid or gaseous fuel supplied by the common pipe. Units that combust fuel other than the fuel supplied by the common pipe must be accounted for under a separate configuration. For example, a unit that burns coal and natural gas may not be included in a common pipe configuration for units that only combust natural gas. In such a situation, you may report the units that only combust natural gas as a common pipe configuration. To calculate emissions for the common pipe, you would subtract the quantity of diverted gas (i.e. gas combusted at a coal unit) from the quantity of gas measured for the common pipe by using company records. The diverted gas would need to be accounted for in a separate configuration (unless diverted offsite or to an exempt unit).

The tier required for the common pipe configuration is based on the maximum rated heat input capacity of the largest unit served by the common pipe.

Configuration Type 5 – Common Stack [98.36(c)(2)]

If multiple units vent to a common stack or duct and Tier 4 is used to calculate the CO₂ emissions for those units, the common stack configuration must be used. If only a single combustion unit vents to the stack and no process units are vented to the stack, then Configuration Type 2 (single unit using Tier 4) should be used.

Configuration Type 6 – Alternative Part 75 Reporters [98.36(d)(2)]

This configuration represents the alternative calculation and reporting requirements available to certain units that report heat input year-round to EPA according to part 75. Units subject to subpart D (electricity generating units that are subject to the Acid Rain Program or EGUs that are otherwise required to monitor and report to EPA CO₂ emissions year-round according to Part 75) would not be eligible to report under this option. Units subject to subpart D should report following the instructions for subpart D.

If this option is selected in place of using one of the 4 tiers, the applicable calculation methodology specified in 98.33(a)(5) must be used to calculate CO₂ emissions and the reporting requirements specified in 98.36(d)(2) replace the requirements specified in 98.36(a)-(b).

Use the radio buttons to select a configuration type.

When finished, click NEXT.

The next screen will vary slightly depending on the configuration type selected.

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Once a configuration is added, you will be prompted to input information that will serve to identify the configuration. The identification elements are listed below for each configuration type:

For configurations of Type 1 (single unit using Tiers 1, 2, or 3), subpart C requires the following identification information for each configuration:

• A unique unit name or identifier (e.g., a unit ID number) [98.36(b)(1)]
• A description of the unit or unit aggregation
• A code representing the type of unit [98.36(b)(2)]
  • If the unit type is not provided in the given pick list, the user should select the type “OCS (Other combustion source)” and specify an appropriate unit type in the free text field
• The value of the maximum rated heat input capacity of the unit in mmBtu/hr (boilers and process heaters must use mmBtu/hr, if mmBtu/hr is not applicable for other unit types, use another relevant unit of measure) [98.36(b)(3)]
• Whether the configuration has the capacity to generate electricity

For configurations of Type 2 (single unit using Tier 4), subpart C requires the following identification information for each configuration:

• A unique unit name or identifier (e.g., a unit ID number) [98.36(b)(1)]
• A description of the unit or unit aggregation
• A code representing the type of unit [98.36(b)(2)]
• The value of the maximum rated heat input capacity of the unit in mmBtu/hr (boilers and process heaters must use mmBtu/hr, if mmBtu/hr is not applicable for other unit types, use another relevant unit of measure) [98.36(b)(3)]
• The methodology start date and end date, for the unit [98.36(b)(6)-(7)]
• Whether the configuration has the capacity to generate electricity

For configurations of Type 3 (aggregation of units), subpart C requires the following identification information for each configuration:

• A unique name or identifier that begins with the prefix “GP” [98.36(c)(1)(i)]
• A description of the unit or unit aggregation
• The highest maximum rated heat input capacity of any unit in the group in mmBtu/hr [98.36(c)(1)(iv)]
• Whether the configuration has the capacity to generate electricity

For configurations of Type 4 (common pipe configurations), subpart C requires the following identification information for each configuration:

• A unique name or identifier that begins with the prefix “CP” [98.36(c)(3)(i)]
• A description of the unit or unit aggregation
• The highest maximum rated heat input capacity of any unit served by the common pipe in mmBtu/hr [98.36(c)(3)(iii)]
• Whether the configuration has the capacity to generate electricity

For configurations of Type 5 (monitored common stack or duct configurations), subpart C requires the following identification information for each configuration:

• A unique name or identifier that begins with the prefix “CS” [98.36(c)(2)(i)]
• A description of the unit or unit aggregation
• The number of units sharing the common stack [98.36(c)(2)(ii)]
• The combined maximum rated rated heat input capacity of the units sharing the common stack in mmBtu/hr [98.36(c)(2)(iii)]
• The methodology start date and end date, for the configuration [98.36(c)(2)(vi)-(vii)]
• Whether the configuration has the capacity to generate electricity

For configurations of Type 6 (year-round Part 75 heat input reporters), subpart C requires the following identification information for each configuration:

• Unit, stack, or pipe ID numbers: use exact same unit, common stack, common pipe, or multiple stack identification numbers that represent the monitored locations (e.g., 1, 2, CS001, MS1A, CP001, etc.) that are reported under 40 CFR 75.64 [98.36(d)(2)(i)]
• A description of the unit or unit aggregation
• The Part 75 methodology used to calculate the CO₂ mass emissions (Appendix D and G calculation method, Low Mass Emissions calculation method in 40 CFR 75.19, or CEMS calculation method) [98.36(d)(2)(ii)(B), 98.36(d)(2)(iii)(B)]
• An indication of the Part 75 heat input method used (Appendix D method, Low Mass Emissions calculation method in 40 CFR 75.19, or CEMS calculation method) [98.36(d)(2)(ii)(E), 98.36(d)(2)(iii)(E)]
• The methodology start date and end date [98.36(d)(ii)(C)(D), 98.36(d)(iii)(C)(D)]
• Whether the configuration has the capacity to generate electricity

Use the text boxes and drop-down menus to enter the required information for the configuration type selected.

If you indicated that the configuration has the capacity to generate electricity, enter the following information for each configuration:

• Nameplate generating capacity
• Prime mover technology (dropdown)
• Type of thermal energy generation (dropdown)
• Gross generation
• Net generation
• Total gross thermal output, for cogeneration or bigeneration
• Other steam used for acid rain program
• If applicable, the supplemental firing fuel type and mass or volume of fuel combusted
• If applicable, the geothermal steam utilized
• For hydrogen fuel cells, the hydrogen fuel cell fuel utilized

When finished, click SAVE.

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To edit an existing configuration, click on the edit icon or the Configuration Name or ID link in the first column of the CONFIGURATION SUMMARY table.

To delete an existing configuration, click on the delete icon in the last column of the CONFIGURATION SUMMARY table.

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See Also

Screen Errors
Using Cal e-GGRT to Prepare Your Subpart C Report
Subpart C Configuration-Level Emissions Information
Subpart C Fuel Identification Information
Subpart C Fuel-Level Emissions Information
Subpart Validation Report