They already said it would be beyond a standard US power socket 120V x 15A = 1800w (US will be shipped underclocked)
and standard EU power socket is 230V x 12A = 2760w

So my guesstimate is somewhere between 1800w-2760w (2280w is the average)

They used large standard PC coolers and a desktop case on the last lot so expect to add your own 4U rack cases.

They did say that 20nm would be their last consumer focused product. I took that to mean aiming for bulk data centers sales going forward.