That's a 16.56 MW bucket excavator! But the conveyor draws 27 MW. Definitely needs its own substation infra. Quite amazing at that size that electric is the way to go.
I've spent some time in mining, electricity for heavy excavators has been a thing since the 1970s, even the 100 tonne trucks have had electric motor drives since then (albeit powered by onboard diesal engines that generate the power to banks that run the individual per wheel drive engines and regen charge from braking.
The next great leap forward is projects such as the "Infinity Train" that aim to recover electricity from the annual lowering of almost a billion tonne of iron ore per annum to sea level from an inland height of some 600m above MSL.
[1]: https://en.m.wikipedia.org/wiki/Bagger_293