26 Energy Sankey diagram illustrating our energy flows 302–1, 302–2 In 1898, Irish engineer Captain Mat thew Sankey used this form of diagram – for the first and only time – to illustrate energy flows and losses using propor tionally thick arrows, in a method that came to be named af ter him. Although preparing the data for Sankey diagrams is ver y time -consuming, the information is easy to interpret. Essentially, the wider the arrow, the more energy involved. This diagram shows which energy sources we use, in what form and for what purpose. The international standard ISO 50001 suppor ts us in reducing our energy consumption and lowering our emissions. The key focal points of this energy manage - ment system are the planning process and the company energy assessment , which are designed to optimise our energy per formance in terms of consumption, ef ficiency and use. Our energy team is working hard to achieve this goal, suppor ted by our planning process and action plan. One of their tasks is to evaluate the company ’s energy per formance to see if we’re improving. In practice, this means identif ying any ef ficiency increases. Management approaches Energy usage 2021/22 Production processes Employee mobilit y Shut tles Air travel Combustion engine fleet Electric fleet Business trips using third-par t y vehicles ( private transpor t, rental cars, ta xis ) Mineral oil CNG Electricit y mix District heating PV electricit y Hydroelectric power Solar thermal Natural gas Train travel 0.43 GWh Waste heat from pressurised air 22.9 GWh Waste heat from processes Heat recover y 5 GWh Waste heat from processes ∼ 6 GWh 165,6 GWh 110,3 GWh 13,08 GWh 1,01 GWh 1,42 GWh 0,94 GWh 0,144 GWh 0,217 GWh 0,034 GWh 0,7 GWh 0,322 GWh 35,38 GWh 44,91 GWh DL 6,7 GWh 22,54 GWh 12,84 GWh 10,4 GWh WRG 15,3 GWh 0,636 GWh 0,041 GWh 17,6 GWh
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