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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.

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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.

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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.

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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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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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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.

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When finished, click NEXT.

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

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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.

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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:

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* Note that you should report the customer's 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" “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" “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.

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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.

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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:

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When finished, click NEXT.

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

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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.

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