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AASB S2 Climate Reporting

Versioned emission factors for audit-ready climate disclosure, not just the number

The problem

Group 2's first mandatory reporting period started 1 July. Scope 1 and 2 emissions data has to be audit ready from day one of that period, not backfilled later, since limited assurance applies from Year 1. Most teams are still calculating emissions from a downloaded NGA Factors spreadsheet, which answers the arithmetic question but not the provenance one, which version, which date, applied consistently across every facility and reporting period.

How it works

The Climate Disclosure API returns NGA Factors by fuel type, electricity source, and state, with the factor version and publication year on every response, so a calculation can be traced back to exactly which published workbook it used.

Which plan you need

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Further reading

Frequently asked questions

Does this replace a carbon accounting platform?
No, it provides the underlying versioned emission factor data that feeds into one, not the broader accounting or reporting workflow.
Which AASB S2 group does this matter most for right now?
Group 2, whose first mandatory reporting period started 1 July 2026. Group 1 entities are already in their reporting cycle, Group 3 starts July 2027.
How do I prove which factor version was used for a past calculation?
Every response carries the factor version and publication year current at the time it was returned, which is the record needed to reconstruct a past calculation.
Does this cover Scope 3 as well as Scope 1 and 2?
The API covers factors across Scope 1, Scope 2, and Scope 3 categories where NGA Factors provide them.
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