1156 The remaining 3.09-million-liter diesel for truck haulage off the trolley installations show a reasonable potential for battery equipped trolley trucks (see Figure 7). Figure 7 - Diesel consumption (in 1000 liter) at the Erzberg Mine in 2025 Because of the energy efficiency of electric powertrain compared to diesel powertrains only about one third of the 3.09-million-liter diesels’ energy content would be the equivalent electrical energy needed for truck haulage. This results in a total of 10.1 GWh of electrical energy. With 2025 prices for diesel (1.16 €/Liter) and for electrical energy (120 €/MWh) the potential of yearly savings is 2.4 Mio €. 4. BATTERY TECHNOLOGY FOR BEV – TROLLEY TRUCKS With the given trolley installations, a battery equipped trolley truck could dynamically charge the battery during trolley operation at an average power level of 500 kW. Together with downhill recuperated energy this is sufficient for charging the energy which the trucks need in their haulage cycle off the trolley line. For the specific situation at the Erzberg mine with ramps where trolley assisted haulage is enabled a battery capacity of 500 kWh would be sufficient. On uphill loaded haulage cycles with trolly assistance as well as on downhill loaded cycles without trolley assistance the discharge of the battery would be around 50 kWh. The 500 kWh battery could run on a regular 45 to 55% duty which means a depth of discharge (DoD) ratio of 10% to maximise battery lifetime. For sufficient traction power off the trolly the 500 kWh battery must meet a ratio of charge/discharge speed relative to its capacity (C-rate) between 2 and 2.5. The C-rates
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