Greenhouse Gas Reporting Help

Subpart NN LDC GHG Information

Created by Theresa Mastrian, last modified by Emmanuel Kalluri on Feb 13, 2012

This page provides a step-by-step description of how to enter Subpart NN GHG data for LDCs.

The GHG information required for LDCs includes six steps:

The steps required to complete your LDC report include the use of either Step A2.1 or Step A2.2, but not both.

Your selection of a calculation methodology in Step A1 will determine whether e-GRRT uses Step A2.1 or Step A2.2 to calculate CO₂ quantities from natural gas received at city gate station(s).

Each step is described below

Step A1 - Calculation Methodology

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Find the table titled "GHG SUMMARY" and click OPEN.

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Use the radio buttons to select the methodology used to calculate CO₂ quantities from natural gas supplied.

Methodology 1 uses a higher heating value and CO₂ emissions factor based on heat content to calculate CO₂ quantities associated with natural gas supplied.

Methodology 2 uses a CO₂ emissions factor based on product volume to calculate CO₂ quantities associated with natural gas supplied.

Based on your selection, e-GRRT will use either Equation NN-1 (if Methodology 1 is selected) or Equation NN-2 (if Methodology 2 is selected) to calculate CO₂ associated with natural gas supplied.

When finished, click NEXT.

Step A2.1 - Equation NN-1 Summary and Results

This section provides instructions for users that selected Methodology 1. If you selected Methodology 2, skip to Step A2.2 - Equation NN-2 Summary and Results.

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If you selected Methodology 1 in Step A1, e-GGRT will guide you to the page containing Subpart NN Equation NN-6. To get started, click NEXT.

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e-GGRT will guide you to the Equation NN-1 overview page where you can use the radio buttons to indicate the source of reported GHG quantities associated with natural gas received at your city gate stations. You can either use the calculated result, or choose to enter your own result.

If you elect to enter your own result, enter the quantity of CO₂ associated with the natural gas received at city gate stations (in metric tons of CO₂) in the space provided, then click NEXT. If you choose to use eGGRT to calculate the result for you, simply click NEXT without entering a value.

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In the spaces provided, enter the total annual volume of natural gas received at city gate stations (in thousand standard cubic feet) and the number of days during the reporting year for which substitute data procedures were used to determine this quantity.

Then use the drop-down menu to select the industry standard used to measure the volume.

When finished, click NEXT.

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Use the radio buttons to indicate your source for the higher heating value and CO₂ emissions factor.

If you elect not to use the default values, in the spaces provided, enter your own higher heating value (million Btu per thousand standard cubic feet) and/or CO₂ emissions factor (in kilograms CO₂ per million Btu) as well as the number of days during the reporting year for which substitute data procedures were used to determine these quantities.

Finally, use the drop-down menus to select the industry standard(s) used to measure the higher heating value and/or CO₂ emissions factor.

When finished, click NEXT.

You may now skip Step A2.2 and move on to Step A3 of these instructions.

Step A2.2 - Equation NN-2 Summary and Results

If you selected Methodology 2 in Step A1, e-GGRT will guide you to the page containing Subpart NN Equation NN-6.

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To get started, click NEXT.

e-GGRT will guide you to the Equation NN-2 overview page where you can use the radio buttons to indicate the source of reported GHG quantities associated with natural gas received at your city gate stations. You can either use the calculated result, or choose to enter your own result.

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If you elect to enter your own result, enter the quantity of CO₂ associated with the natural gas received at city gate stations (in metric tons of CO₂) in the space provided then click NEXT. If you choose to use eGGRT to calculate the result for you, simply click NEXT without entering a value.

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Then use the drop-down menu to select the industry standard used to measure the volume.

When finished, click NEXT.

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Use the radio buttons to indicate your source for the CO₂ emissions factor.

If you elect not to use the default value, in the spaces provided, enter your own CO₂ emissions factor (in metric tons CO₂ per thousand standard cubic feet) as well as the number of days during the reporting year for which substitute data procedures were used to determine this quantity.

Finally, use the drop-down menu to select the industry standard used to measure the CO₂ emissions factor.

When finished, click NEXT.

Step A3 - Equation NN-3 Summary and Results

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On the Subpart NN Equation NN-3 overview page, use the radio buttons to indicate the source of reported CO₂ quantities from natural gas delivered to downstream transmission pipelines or other LDCs.

If you elect to enter your own result, enter the total CO₂ quantity from natural gas delivered to downstream transmission pipelines or other LDCs (metric tons) in the space provided then click NEXT. If you choose to use eGGRT to calculate the result for you, simply click NEXT without entering a value.

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In the spaces provided, enter the total annual volume of natural gas delivered to downstream transmission pipelines or other LDCs (in thousand standard cubic feet) and the number of days during the reporting year for which substitute data procedures were used to determine this value.

When finished, click NEXT.

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Use the radio buttons to indicate your source for the CO₂ emissions factor.

If you elect not to use the default value, enter your own CO₂ emissions factor (in metric tons CO₂ per thousand standard cubic feet) and the number of days missing data procedures were used to determine this value in the space provided.

Then use the drop-down menu to select the industry standard used to measure the volume.

When finished, click NEXT.

Step A4 - Equation NN-4 Summary and Results

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On the Subpart NN Equation NN-4 overview page, use the radio buttons to indicate the source of reported GHG quantities from natural gas delivered to end-users that receive a supply greater than or equal to 460,000 thousand standard cubic feet per year.

If you elect to enter your own result, enter the CO₂ quantity associated with natural gas delivered to end-users that receive a supply greater than or equal to 460,000 thousand standard cubic feet per year (in metric tons) in the space provided then click NEXT. If you choose to use eGGRT to calculate the result for you, simply click NEXT without entering a value.

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Subpart NN requires you to enter the following information for each meter registering a supply equal to or greater than 460,000 thousand standard cubic feet during the reporting year:

Customer Name
Customer Address (street address, city, state, zip code)*
Meter Number
Customer's EIA identification number (if known)**
The annual volume of natural gas delivered to the meter (in thousand standard cubic feet)

* Note that you should report the customer’s physical address, if the physical address is known. Should a facility you deliver gas to not have a physical address, the facility's mailing address may be used.

** Note that LDCs are only required to report this information if known. The EIA identification number referenced here is a number assigned to electric power plants who report on EIA Form EIA-923 (Power Plant Operations Report). Each facility who reports on this form is assigned a “Plant ID” number by EIA, which is a unique number for each power generating facility. This identification number is from 1 to 5 digits in length and can be found in the files under “Downloads” located at: http://www.eia.gov/cneaf/electricity/page/eia906_920.html. Reporting of this identification number is not required.

To add a meter, click ADD METER. If you did not deliver 460,000 thousand standard cubic feet of natural gas to any meters during the reporting year, you may click NEXT and proceed to section A5 of these instructions.

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For each meter, enter the requested data.

When finished, click SAVE.

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To edit the details of a particular meter, click EDIT.

To add another meter, click ADD METER and repeat the process shown above.

Once the required information has been entered for all meters, click NEXT.

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Use the radio buttons to indicate your source for the CO₂ emissions factor.

If you elect not to use the default value, enter your own CO₂ emissions factor (in metric tons CO₂ per thousand standard cubic feet) and the number of days substitute data procedures were used to determine this value in the space provided.

Then use the drop-down menu to select the industry standard used to measure the volume.

When finished, click NEXT.

Step A5 - Equation NN-5 Summary and Results

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On the Subpart NN Equation NN-5 overview page, use the radio buttons to indicate the source of reported CO₂ quantities from the net quantity of natural gas that is liquefied and/or stored/removed from storage and received from local production by the LDC within the reporting year.

If you elect to enter your own result, enter your CO₂ quantity from the net quantity of natural gas that is liquefied and/or stored/removed from storage and received from local production by the LDC within the reporting year (in metric tons) in the space provided then click NEXT. If you choose to use eGGRT to calculate the result for you, simply click NEXT without entering a value.

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In the spaces provided, enter the total annual volume of natural gas received at the city gate and stored on-system or liquefied and stored (in thousand standard cubic feet) and the number of days during the reporting year for which substitute data procedures were used to determine this quantity.

When finished, click NEXT.

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Enter the following information in the spaces provided:

The annual volume of vaporized liquefied natural gas produced at on-system vaporization facilities for delivery on the distribution system (in thousand standard cubic feet).
The annual volume of natural gas withdrawn from on-system storage (that is not delivered to the city gate) for delivery on the distribution system (in thousand standard cubic feet).
The annual volume of natural gas delivered directly to the LDC systems from producers or natural gas processing plants from local production (in thousand standard cubic feet).
The number of days in the reporting year for which substitute data procedures were used for each of the three volumes.

When finished, click NEXT.

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Use the radio buttons to indicate your source for the CO₂ emissions factor.

If you elect not to use the default value, enter your own CO₂ emissions factor (in metric tons CO₂ per thousand standard cubic feet) and the number of days during the reporting year that substitute data procedures were used to determine this value in the space provided.

Then use the drop-down menu to select the industry standard used to measure the volume.

When finished, click NEXT.

Step A6 - Equation NN-6 Summary and Results

e-GGRT will use the calculated results from Equations NN-1 or NN-2, NN-3, NN-4, and NN-5 in Equation NN-6 to calculate the CO₂ quantity associated with the combustion or oxidation of natural gas supplied to end-users that receive less than 460,000 thousand standard cubic feet (mscf) per year.

Review the results of each individual equation and the result of equation NN-6.

Note that the value for CO₂l may either be positive or negative depending on whether more natural gas was withdrawn from storage/received from local production or placed into storage during the reporting year.

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When you are satisfied that all entered data is correct, click FINISHED.

#Back to Top

Step A1 - Calculation Methodology

Step A2.1 - Equation NN-1 Summary and Results

Step A2.2 - Equation NN-2 Summary and Results

Step A3 - Equation NN-3 Summary and Results

Step A4 - Equation NN-4 Summary and Results

Step A5 - Equation NN-5 Summary and Results

Step A6 - Equation NN-6 Summary and Results

See Also