Aluminum GHG Emissions Reporting Guidance
This document serves as a useful reference for aluminum companies to report emissions in a way that drives industry-wide actions on decarbonization and accelerates the development of a climate differentiated market for low-carbon aluminum. This document is developed based on the carbon accounting principles of RMI’s Horizon Zero project. The overarching principle is the need for companies to report emissions at the product level from a specific asset.
Characterization factor
The current version of the guidance recommends AR5 (100 year GWP)
To align with PACT Methodology: Use the latest version of the IPCC Assessment Report publication as indicated in Chapter 3.2.1 of the PACT Methodology
Exemption rule
The current version of the guidance does not specify an exemption rule
To align with PACT Methodology: Ensure the max. 1% of emissions at individual attributable processes, and cumulative at max. 5% of emissions overall as indicated in Chapter 3.3.1.2 of the PACT Methodology
Biogenic emissions and removals
Not been relevant for this product, so not currently included
Validity period
The current version of the guidance mandates a yearly update
This is stricter than PACT and therefore, no other additional action is needed
Data quality metrics
The current version of the guidance does not mandate a specific data quality assessment (DQR matrix), both PACT and PEF are referred to
To align with PACT Methodology: Use the data quality metrics as indicated in Chapter 4.2.3 of the PACT Methodology
Assurance and verification
The current version of the guidance does not include specific requirements about the level and basis for assurance and verification
To align with PACT Methodology: Follow the requirements specified in Chapter 5 of the PACT Methodology
