Heavy duty machine electrification in underground mine. What is the net present value of diesel and electric options given the numbers in the table? Diesel Machine cost 1 000 000 Energy consumption per year 50 000 litres Energy cost 1 /l Savings in ventilation energy Battery replacement cost Charger cost (lifetime) Expected life time for the vehicle is 15 years. Discount rate is 7% Electric 1 400 000 100 000 kWh 0,20 /kWh 250 000 kWh 100 000 (every 5 years) 100 000