Sustainability Data 2013
The bauxite, alumina and aluminium sectors produced:
- 83.5 Mt of bauxite
- 21.8 Mt of alumina
- 1.78 Mt of primary aluminium.
Australia's seven alumina refineries consumed 226 PJ of energy, higher than the 221 PJ consumed in 2012, due to higher production. Efficiency in energy use was steady at 10.4 GJ per tonne of production compared to the 10.2 GJ per tonne of production in 2012.
Alumina production processes emitted 15.5 Mt of greenhouse emissions (CO2-e), predominantly from direct consumption of energy for heat but also including around 0.8 Mt CO2-e from purchased electricity.
Emissions intensity for alumina production was 0.72 tonnes CO2-e per tonne of alumina, a 3.6% increase from 2012, and 24.7% lower than the commonly used baseline year of 1990.
Australia's five primary aluminium smelters consumed 26,337 GWh of electricity, 4.8% lower than the 27,672 GWh consumed in 2012 and well below the sector peak of 29,736 GWh recorded in 2008. Efficiency improved to 14,764 kWh per tonne of production compared to the 14,809 kWh per tonne of production in 2012.
The decrease in both total electricity consumption and electricity consumption per tonne of aluminium could partially be attributed to the closure of the Kurri Kurri facility.
The aluminium smelting sector emitted a total of 26.6 Mt CO2-e, comprising:
- 23.3 Mt CO2-e of indirect emissions (Scope 2) from electricity consumption
- 2.85 Mt CO2-e of direct emissions (Scope 1) from carbon used in the production process
- 0.19 Mt CO2-e of direct emissions in the form of perfluorocarbons (PFCs) from the process
- 0.23 Mt CO2-e of other site-level emissions.
The combined direct and indirect greenhouse emission intensity of Australian primary aluminium production improved to 14.9 tonnes CO2-e per in 2013 from 15.4 tonnes in 2012 and is the lowest reported figure for the sector. This fall in emission intensity could be partially attributed to reducing default National Greenhouse and Energy Reporting emission factors for state-based electricity.
Aluminium emissions intensity from electricity consumption was down 3.8% from 2012 to 13.03 tonnes CO2-e per tonne of aluminium produced and represents a 19.3% improvement over 1990 levels. Intensity of indirect emissions from aluminium production as reported was 1.83 tonnes CO2-e per tonne of aluminium produced, 1.4% lower than in 2012 and a 63.7% improvement over 1990 levels.