We know enough from the article to be able to ballpark estimate it. Heat capacity of aluminum is 0.9 kJ/kg °C, and the latent heat of fusion is 390kJ/kg. The temperature they heat the aluminum to is 700°C, from presumably room temperature around 20°C - so 0.9*680 + 390 kJ/kg = 1002 kJ/kg is going to be the basic heating requirement, or as near as dammit 1MJ/kg. Getting that heat into the aluminum and then maintaining that temperature during the print presumably introduces some inefficiencies (induction furnaces can heat aluminum with about 40-50% efficiency), plus they have to move the mass of aluminum around with their print motors... but the heat to melt the aluminum feels likely to be the main energy sink. Inductively heated, with good crucible insulation, 2MJ/kg sounds like a reasonable energy budget?

For a comparison, that's about ten times the amount of energy you use running your microwave to heat up a ready meal, for every kilogram of aluminum you want to form.