EPA’s environmental performance

Activity data and quantification methods


Calculation of scope 1scope 2 and scope 3 greenhouse gas (GHG) emissions are performed using activity data and GHG emissions quantification methodologies.

Activity data

Activity data is a key input in to the calculation of GHG emissions. It refers to quantitative data associated with the activity that generated the GHG emissions. For example, activity data for emissions from purchased electricity may refer to electricity consumption amounts stated on supplier invoices (typically in kWh). Activity data provides a measure for the level of emissions intensity of the activity.

We report our GHG emissions for each financial year period from 1 July to 30 June. Each year we collect activity data from around the organisation for all emission sources.

Quantification methods

The purposes of prescriptive quantification methods are to calculate GHG emissions and express the quantity of emissions in a way that is consistent year-on-year and comparable with other organisations. We use tonnes of carbon dioxide equivalent (t.CO2-e) as unit of measurement to quantify emissions. Our GHG inventory includes all six greenhouse gases covered by the Kyoto Protocol – carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), and sulfur hexafluoride (SF6).

We rely on the quantification methods, including conversion factors, published by the Australian Federal Government and other reputable authorities. In circumstances where appropriate quantification methods are not available, we apply assumptions to develop our own quantification methods. These assumptions are based on the best available information at the time the GHG inventory is prepared. Where assumptions are used, these are documented and made publicly available.

Page last updated on 9 Sep 2019