Subpart GG Information Sheet

Overview

Subpart GG of the Greenhouse Gas Reporting Program (GHGRP) (40 CFR 98.330 – 98.338) applies to any facility that produces zinc (Zn) and meets the Subpart GG source category definition. Some subparts have thresholds that determine applicability for reporting, and some do not. To decide whether your facility must report under this subpart, please refer to 40 CFR 98.331 and the GHGRP Applicability Tool.

This Information Sheet is intended to help facilities reporting under Subpart GG understand how the source category is defined, what greenhouse gases (GHGs) must be reported, how GHG emissions must be calculated and shared with EPA, and where to find more information.

Download print version (pdf) (242 KB)

• How is This Source Category Defined?
• What GHGs Must Be Reported?
• How Must GHG Emissions Be Calculated?
• What Information Must Be Reported?
• What Records Must Be Maintained?
• When and How Must Reported Be Submitted?
• When Can a Facility Stop Reporting?
• For More Information

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How is This Source Category Defined?

Zinc (Zn) production facilities consist of Zn smelters and secondary Zn recycling facilities.

What GHGs Must Be Reported?

Each Zn production facility must report:

• Carbon dioxide (CO₂) process emissions from each Waelz kiln and electrothermic furnace used for Zn production..
• CO₂, nitrous oxide (N₂O), and methane (CH₄) combustion emissions from each Waelz kiln. Calculate and report these emissions under Subpart C (General Stationary Fuel Combustion Sources) found at 40 CFR 98.30 – 98.38.
• CO₂, N₂O, and CH₄ combustion emissions from each stationary combustion unit other than Waelz kilns. Calculate and report these emissions under Subpart C (General Stationary Fuel Combustion Sources) found at 40 CFR 98.30 – 98.38.

If multiple Greenhouse Gas Reporting Program (GHGRP) source categories are co-located at a facility, the facility may need to report greenhouse gas (GHG) emissions under a different subpart. Please refer to the relevant Information Sheet for a summary of the rule requirements for any other source categories located at the facility.

How Must GHG Emissions Be Calculated?

Calculate CO₂ process emissions from each Waelz kiln and electrothermic furnace by using one of two methods, as appropriate:

• Installing and operating a continuous emission monitoring system (CEMS) to measure combined process and combustion CO₂ emissions by following the requirements of Subpart C (General Stationary Fuel Combustion Sources) found at 40 CFR 98.30 – 98.38.
• Calculating the process CO₂ emissions using the following measurements:
  • Annual mass of each carbon (C)-containing input material consumed (e.g., flux material, C electrodes, and other carbonaceous material).
  • Average C content of each material consumed or used in the calendar year.

However, if process CO₂ emissions from a Waelz kiln or electrothermic furnace are emitted through the same stack as a combustion unit or process equipment that uses a CEMS and follows Tier 4 Calculation Methodology in Subpart C to report CO₂ emissions, then the CEMS must be used to measure and report combined CO₂ emissions from that stack, instead of the calculation procedure described below

A checklist for data that must be monitored is available here: Subpart GG Monitoring Checklist.

What Information Must Be Reported?

In addition to the information required by the General Provisions in Subpart A, found at 40 CFR 98.3(c), the following must be reported under the circumstances indicated:

• If a CEMS is used to measure emissions, then under this subpart the relevant information required under 40 CFR Subpart C for the Tier 4 Calculation Methodology and the following information must be reported:
  • Annual Zn product production capacity (tons).
  • Annual production quantity for each Zn product (tons).
  • Annual facility production quantity for each Zn product (tons).
  • Number of Waelz kilns at each facility used for Zn production.
  • Number of electrothermic furnaces at each facility used for Zn production.
  • Total amount of electric arc furnace (EAF) dust annually consumed by all Waelz kilns at the facility (tons).
• If a CEMS is not used to measure CO₂ emissions, then the information listed below must be reported:
  • Identification number and annual process CO₂ emissions from each individual Waelz kiln or electrothermic furnace (metric tons).
  • Annual Zn product production capacity (tons).
  • Annual production quantity for each Zn product (tons).
  • Number of Waelz kilns at each facility used for Zn production.
  • Number of electrothermic furnaces at each facility used for Zn production.
  • Total amount of EAF dust annually consumed by all Waelz kilns at the facility (tons).
  • Whether C content of each C-containing input material charged to each Waelz kiln or electrothermic furnace is based on reports from the supplier or through self-measurement using applicable American Society for Testing and Materials (ASTM) Standard Test Method.
  • If C content of each C-containing input material charged to each Waelz kiln or electrothermic furnace is based on self-measurement, then report the ASTM Standard Test Method used.
  • Whether C content of the C electrode used in each electrothermic furnace is based on reports from the supplier or through self-measurement using applicable ASTM Standard Test Method.
  • If C content of the C electrode used in each furnace is based on self-measurement, then report the ASTM Standard Test Method used.
  • If you use the missing data procedures in 40 CFR 98.335(b), you must report how the monthly mass of C-containing materials with missing data was determined and the number of months the missing data procedures were used.

What Records Must Be Maintained?

Reporters are required to retain records that pertain to their annual GHGRP report for at least three years after the date the report is submitted. Please see the Subpart A Information Sheet and 40 CFR § 98.3(g) for general recordkeeping requirements. Specific recordkeeping requirements for Subpart GG are listed at 40 CFR 98.337.

When and How Must Reports Be Submitted?

Reporters must submit their annual GHGRP reports for the previous calendar year to the EPA by March 31^st, unless the 31st falls on a Saturday, Sunday, or federal holiday, in which case reports are due on the next business day. Annual reports must be submitted electronically using the electronic Greenhouse Gas Reporting Tool (e-GGRT), the GHGRP’s online reporting system. 

Additional information on setting up user accounts, registering a facility, and submitting annual reports is available on the GHGRP Help webpage.

When Can a Facility Stop Reporting?

A facility may discontinue reporting under several scenarios, which are summarized in the Subpart A Information Sheet and the frequently asked questions (FAQs).

For More Information

For additional information on Subpart GG, please visit the Subpart GG webpage. For additional information on the GHGRP, please visit the GHGRP website, which includes additional information sheets, data previously reported to the GHGRP, training materials, and links to FAQs. For questions that cannot be answered through the GHGRP website, please contact us at: GHGreporting@epa.gov.

This Information Sheet is provided solely for informational purposes. It does not replace the need to read and comply with the regulatory text contained in the rule. Rather, it is intended to help reporting facilities and suppliers understand key provisions of the GHGRP. It does not provide legal advice; have a legally binding effect; or expressly or implicitly create, expand, or limit any legal rights, obligations, responsibilities, expectations, or benefits with regard to any person or entity.

Zinc Production Information Sheet

• Zinc Production Information Sheet (pdf) (57.41 KB)