The extraction and processing of aluminium produces gaseous, liquid and solid emissions. In order to minimise the effects of climate change, greenhouse gas emissions must be drastically reduced. Central measures to reduce emissions include:
Expansion by connecting the rolling mill east and south areas to the hot water network and Integration of the compressor Station
Transport: Optimising logistics processes
In categorising the CO2 footprint, the division of emissions into three so-called "scopes" is particularly relevant.
Scope 1 emissions derive especially from the gas-fired melting and heat treatment of aluminium alloys, the temperature control of fluids used in building heating systems, and the diesel used for the vehicle fleet.
Scope 2 emissions arise when generating the electricity consumed. These are measured based on data from electricity suppliers about the CO2 intensity of their electricity generation.
Scope 3 covers all other greenhouse gas emissions caused by the organisation’s outsourced operations.
In 2019, direct greenhouse gas emissions (Scope 1) amounted to 104,400 tonnes (2018: 101,000 tonnes). No Scope 2 emissions were generated in 2019 thanks to the purchase of electricity from hydropower and other renewable sources.
Specific CO2 emissions (Scope 1 + 2) in relation to production volume (tonnes of CO2/t) grew to 0.163 CO2/t in 2019 (2018: 0.159 CO2/tonne).
For reasons of materiality, only upstream emissions from the purchase of primary aluminium, rolling slabs and metal alloys are included in the calculation of Scope 3 emissions. In 2019, Scope 3 emissions amounted to 1,200,000 tonnes of CO2eq.