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• Step A1 - Calculation Methodology
• Step A2:
  • Step A2.1 - Equation NN-1 Summary and Results
    OR
  • 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 5a and NN-5b Summary and Results
• Step A6 - Equation NN-6 Summary and Results

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Each step is described below.

For facilities who also report to EIA's Annual Report of Natural and Supplemental Gas Supply and Disposition, a data element crosswalk with Form EIA-176 and Subpart NN is available at: Optional Calculation Spreadsheet Instructions

Step A1 - Calculation Methodology

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

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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.

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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.unmigrated-inline-wiki-markup

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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.unmigrated-inline-wiki-markup

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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, click the radio button "Enter my 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, and then click NEXT to advance to the next screen. If you choose to use eGGRT to calculate the result for you, simply make sure the radio button "Use the calculated result rounded" is selected and click NEXT without entering a value.

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In the spaces provided, 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. If you select "Other" from the drop-down menu, enter the name or a short description of the method you used.

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.

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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.

If you select "Other" from the drop-down menu, enter the name or a short description of the method you used.

When finished, click NEXT.

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

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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.unmigrated-inline-wiki-markup

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If you elect to enter your own result, click the radio button "Enter my 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 and then click NEXT to advance to the next screen. If you choose to use eGGRT to calculate the result for you, simply make sure the radio button "Use the calculated result rounded" is selected and 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. If you select "Other" from the drop-down menu, enter the name or a short description of the method you used.

When finished, click NEXT.unmigrated-inline-wiki-markup

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

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Finally, use the drop-down menu to select the industry standard used to measure the CO₂ emissions factor. If you select "Other" from the drop-down menu, enter the name or a short description of the method you used.

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, select the radio button "Enter my own result," enter the total CO₂ quantity from natural gas delivered to downstream transmission pipelines or other LDCs (metric tons) in the space provided, and then click NEXT to advance to the next screen. If you choose to use eGGRT to calculate the result for you, simply make sure the radio button "Use the calculated result rounded" is selected and click NEXT without entering a value.unmigrated-inline-wiki-markup

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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. If your LDC does not deliver natural gas to downstream transmission pipelines or other LDCs, then enter "0" in both fields.

When finished, click NEXT.unmigrated-inline-wiki-markup

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

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Then use the drop-down menu to select the industry standard used to measure the volume. If you select "Other" from the drop-down menu, enter the name or a short description of the method you used.

When finished, click NEXTWhen 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, select the radio button "Enter my 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, and then click NEXT to advance to the next screen. If you choose to use eGGRT to calculate the result for you, simply make sure the radio button "Use the calculated result rounded" is selected and click NEXT without entering a value.

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Subpart NN requires you to 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 Large End-User Name
• Customer Address Large End-User 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 large end-user or the amount delivered to a specific meter located at a large end-user's facility  (in thousand standard cubic feet)
• An indication of whether the quantity of natural gas reported for this large end-user is the total quantity of gas delivered to the large end-user's facility, or a specific meter located a the facility***

* Note that you should report the large end-user's physical address, if the physical address * 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.

***Note that you may enter the quantity of gas delivered to each large end-user as either a total for the large end-user's facility or as the amount of gas delivered to individual meters serving the large end-user's facility. If you elect to report the amount of gas delivered to individual meters, then you must enter data for each meter separately by clicking "ADD Large End-User" and entering the data specified.

To add a large end-user, click ADD LARGE END-USER. If you did not deliver 460,000 thousand standard cubic feet of natural gas to any large end-users during 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 meterlarge end-user, enter the requested data.

When finished, click SAVE.

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To edit the details of a particular large end-userTo edit the details of a particular meter, click EDIT.

To add another meterlarge end-user, click ADD METER LARGE END-USER and repeat the process shown above.

Once the required information has been entered for all meterslarge end-users, click NEXT.

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

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Then use the drop-down menu to select the industry standard used to measure the volume. If you select "Other" from the drop-down menu, enter the name or a short description of the method you used.

When finished, click NEXT.

Step A5 -1 Equation NN-

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5a Summary and Results

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

If you elect to enter your own result, select the radio button "Enter my 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 stored on system within the reporting year (in metric tons) in the space provided, and then click NEXT to advance to the next screen. If you choose to use eGGRT to calculate the result for you, simply make sure the radio button "Use the calculated result rounded" is selected and 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 placed into storage or liguefied 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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If no gas was stored, enter "0" for each parameter in the spaces provided.

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 removed from storage and used for deliveries to customers or other LDCs within the reporting year (in thousand standard cubic feet).
• The annual volume of natural gas withdrawn removed from on-system storage (that is not delivered to the city gate) for delivery on the distribution system storage and used for deliveries to customers or other LDCs within the reporting year (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 .

• The number of days in the reporting year for which substitute data procedures were used for each of the two volumes.

If you did not remove natural gas or liguefied natural gas from storage during the reporting year, enter "0" for each parameter in the spaces provided.

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. If you select "Other" from the drop-down menu, enter the name or a short description of the method you used.

When finished, click NEXT.

Step A5 -2 Equation NN-5b Summary and Results

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On the Subpart NN Equation NN-5b overview page, use the radio buttons to indicate the source of the reported CO₂ quantity from natural gas received by the LDC that bypassed the city gate(s), such as gas received from local production, within the reporting year.

If you elect to enter your own result, select the radio button "Enter my own result," enter your CO₂ quantity from natural gas that received by the LDC that bypassed the city gate(s) within the reporting year (in metric tons) in the space provided, and then click NEXT to advance to the next screen. If you choose to use eGGRT to calculate the result for you, make sure the radio button "Use the calculated result rounded" is selected and click NEXT.

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In the spaces provided, enter annual volume of natural gas received that bypassed the city gate(s) within the reporting year (in thousand standard cubic feet)

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and the number of days

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during the reporting year for which substitute data procedures were used to determine this quantity. If all natural gas you received during the reporting year was received at the city gate(s), or removed from storage, enter "0" for each parameter in the spaces provided.

When finished, click NEXT.unmigrated-inline-wiki-markup

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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-down menu to select the industry standard used to measure the volume. If you select "Other" from the drop-down menu, enter the name or a short description of the method you used.

When finished, click NEXT.

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e-GGRT will use the calculated results from Equations NN-1 or NN-2, NN-3, NN-4, NN-5a and NN-5 in 5b 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.

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Note that the value for CO₂l may be 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.unmigrated-inline-wiki-markup

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When you are satisfied that all entered data is correct, click FINISHED. If you need to change any of the data entered, click OPEN on the GHG SUMMARY table.

Back #Back to Top

See Also

Screen Errors
Using e-GGRT to Prepare Your Subpart NN Report
Subpart NN Summary Information for this Supplier
Subpart NN Miscellaneous Information
Subpart NN LDC GHG Information
Subpart NN Fractionator GHG Information
Subpart Validation Report

Subpart W Data populated from Subpart NN Data