Energy use

Efficient transformation processes are crucial for Gränges to achieve sustainable long-term profitability. Use of energy is a significant cost and reductions therefor offer opportunities to improve profitability and competitiveness, as well as reduced environmental impact.

Direct energy savings are achieved partly by improving production equipment and processes, partly through the recycling of thermal energy from the processes. 

Work on improving energy efficiency is undertaken in a number of ways. Gränges:

  • selects the Best Available Technology (BAT) when making new investments
  • continuously works with energy audits to improve energy efficiency. Energy efficiency goals are set for the production facilities and improvements are defined accordingly for the facilities’ different processes
  • works to increase energy efficiency by, for example, use excess heat from a process to meet the heat demand of other processes
  • has had a great focus on activities linked to increased metal yield and recovery of waste heat from different processes.

Gränges also conducted a number of process optimization activities to reduce leakages from pneumatic devices, avoid unnecessary idling, reduce internal transport, upgrade motors and pumps, and insulate furnaces and improve furnace efficiency.

Gränges has a company-wide energy policy and the production facility in Finspång have a certified energy management system according to ISO 50001.

Total energy use

GWh 2016 2015 2014
Electricity 223.5 216.6 206.2
Natural gas 151.3 145.8 153.0
Liquefied petroleum gas 46.0 46.4 47.3
Diesel 6.9 6.5 6.4
Other 2.5 1.8 2.6


Energy intensity

MWh/tonne aluminium 2016 2015 2014
Gränges
Finspång
Re-melting and
cast house

1.21

1.22

1.27
Mill 1.16 1.14 1.18
Gränges
Shanghai
Re-melting and
cast house

1.22

1.19

1.22
Mill 1.25 1.30 1.31
Gränges Total 2.46 2.50 2.62

 
An increased focus on sustainability issues in production, including recycling, has resulted in reduced energy use per tonne, and contributed to improved productivity.