This page provides an overview of subtopics that are central to Subpart NN reporting. For the purposes of this help content there are three general classifications of Subpart NN reporters; (1) Local Distribution Companies, (2) Interstate NG Pipelines, and (3) NGL Fractionators and LPG Consignees. The table below displays the breakdown of specific reporter types under these three classifications:

• #Summary Information for this Supplier
• #LDC GHG Information
• #Interstate NG Pipeline Information
• #Fractionator GHG Information
• #Validation Report

The end of the page contains links you can use for more information on these topics

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Summary Information for this Supplier

Subpart NN requires you to report the following data about your facility or company:

• The supplier type (LDC or NGL Fractionator)

This information must be input to Cal e-GGRT

LDC Information

For LDCs, Subpart NN requires you to report the following data:

• The annual CO₂ quantities (in metric tons) associated with gas delivered to all meters that receive less than 460,000 thousand standard cubic feet per year (excluding CO₂ associated with natural gas stored for future deliveries)
• The annual CO₂ quantities (in metric tons) that would result from the complete combustion or oxidation of the seven reported volumes that follow:
  • The annual volume (in thousand standard cubic feet) of natural gas received at city gate stations for redelivery on the distribution system, including for use by the LDC, and the specific industry standard used to measure this volume
  • The annual volume (in thousand standard cubic feet) of natural gas placed into storage, including gas liquefied and placed into storage
  • The annual volume (in thousand standard cubic feet) of natural gas that is used for deliveries in the reporting year that was not otherwise accounted for in the above reported volume
    • This includes natural gas previously stored on-system which is removed from storage and used for deliveries to customers or other LDCs by the LDC within the reporting year
    • This also includes liquefied natural gas (LNG) produced at on-system vaporization facilities for delivery on the distribution system
    • This also includes natural gas that bypassed the city gate and was delivered directly to LDC systems from producers or natural gas processing plants from local production
  • The annual volume (in thousand standard cubic feet) of natural gas delivered to downstream gas transmission pipelines and other LDCs
  • The annual volume (in thousand standard cubic feet) of natural gas delivered to each meter registering supply equal to or greater than 460,000 thousand standard cubic feet during the calendar year and the customer name, address, meter number, and EIA identification number (if known) of each meter reading used
• All developed EFs and HHVs and the industry standard(s) used to develop them, if you developed site-specific EFs or HHVs
• The number of days in the reporting year for which substitute data procedures were used to measure quantity, develop HHVs, and develop EFs
• The method used (method one or method two) for estimating CO₂ quantities that would result from the complete combustion or oxidation of natural gas supplied

For LDCs, Subpart NN requires you to report the following additional information:

• The total annual volume (in thousand standard cubic feet) of Natural Gas delivered to each of the following end-user categories:
  • Residential consumers
  • Commercial consumers
  • Industrial consumers
  • Electricity generating facilities

Interstate NG Pipeline Information

Subpart NN reporters for Interstate NG Pipelines are required to complete and upload a Reporting Form to submit required data to ARB.

NGL Fractionator and LPG Consignee Information

For NGL Fractionators, Subpart NN requires you to report the following data:

• Annual CO₂ quantities (in metric tons) associated with all NGLs supplied, excluding quantities associated with NGL received from other fractionators
• Annual CO₂ quantities (in metric tons) associated with the total quantities of NGLs supplied, reported in the following product categories:
  • Ethane
  • Propane
  • Normal butane
  • Isobutane
  • Pentanes plus
• Annual CO₂ quantities (in metric tons) associated with the total quantities of NGLs that are received from other fractionators, reported in the following product categories:
  • Ethane
  • Propane
  • Normal butane
  • Isobutane
  • Pentanes plus
• The annual quantities (in barrels) of ethane, propane, normal butane, isobutane, and pentanes plus supplied to downstream facilities and the specific industry standard used to measure these quantities
• The annual quantities (in barrels) of ethane, propane, normal butane, isobutane and pentanes plus received from other NGL fractionators
• All developed EFs and HHVs and the industry standard(s) used to develop them, if you developed site-specific EFs or HHVs
• The number of days in the reporting year for which substitute data procedures were used to measure quantity, develop HHVs, and develop EFs
• The method used (method one or method two) for estimating CO₂ quantities that would result from the complete combustion or oxidation of each NGL product supplied

For NGL Fractionators, Subpart NN requires you to report the following additional information:

• An indication of each NGL supplied by your facility
• The annual volume (in thousand standard cubic feet) of Natural Gas received for processing
• The annual quantity (in barrels) of y-grade bulk NGLs received from others for fractionation
• The annual quantity (in barrels) of Propane odorized at the facility and delivered to others

Validation Report

You can use the Validation Report to ensure the completeness and quality of your reporting data.

You should use the Validation Report to check your work. The Validation Report performs two types of checks:

• Data Completeness: Data that is required for reporting is missing or incomplete
• Data Quality: Data is outside of the expected range of expected values

You may use the Validation Report after you enter all data for products you supply, or all data for one product.

Note that the Validation Report is intended to assist users in entering data, but it is not an indication that the reporter has entered all necessary information, nor is it an indication that the reporter is in compliance with part 98. Furthermore a negative finding on the validation report is not a guarantee that a data element was entered incorrectly.

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See Also

Screen Errors
Using Cal e-GGRT to Prepare Your Subpart NN Report
Subpart NN Summary Information for this Supplier
Subpart NN Local Distribution Companies (LDCs)
Subpart NN Interstate Natural Gas Pipelines
Subpart NN Natural Gas Liquid Fractionators and LPG Consignees
Subpart Validation Report