The National Greenhouse Accounts (NGA) Factors provides methods that help companies and individuals estimate greenhouse gas emissions. Our department publishes revised factors every year.
About the NGA Factors
The NGA Factors should not be used to meet reporting requirements under the National Greenhouse and Energy Reporting (NGER) Act 2007. While the methods draw on the National Greenhouse and Energy Reporting (Measurement) Determination 2008, companies can apply them to a broader range of emissions estimates.
We estimate default emission factors:
- using the Australian Greenhouse Emissions Information System (AGEIS)
- alongside Australia's National Greenhouse Accounts
This ensures consistency between inventories at the company or facility level, and the national level.
The methods we use at the national level, reflected in the factors, are consistent with international guidelines. They are subject to international expert review each year.
Revisions in this issue
Updates to emissions factors:
- incorporate the latest amendments to Method 1 practices in the National Greenhouse and Energy Reporting (Measurement) Amendment (2021 Update) Determination 2021
This issue supersedes previous issues.
- Read more about our estimation methods in the National Inventory Report 2019
- See previous National Greenhouse Accounts Factors
- Read how we track and report on greenhouse gas emissions
- Read how we report progress towards our targets under the UNFCCC and its Paris Agreement
- Read about the National Greenhouse and Energy Reporting scheme
If you experience any difficulty accessing information in these documents, please contact us.