There is only speculation at this point as KnC has not released any final details yet. But it's likely going to require you to run your Neptune inside a co-location as you will likely need two to four 20AMP circuits to power one. In co-lo's you pay per circuit and not pay for the consumption of power.
What 40A to 80A at 230V to power one Neptune I don't think so. Even 40A@110V sounds far too high as Bitmine can get ~1(GH/s)/~1W@28nm at the wall socket.
Going by KnC's old numbers it was speculated you would need about 3500 watts to power a 4TH/s machine, if KnC bumped it up that high. At this point it's hard to say what the new number means, 43% less power, is that less than original predicted or less than what the 28nm wafer, or chip? So instead of being 0.7watts per GH, I guess its 0.57 watts per GH?
Using the new numbers, I would speculated that you will need 600 to 700 watts of power per 1TH/s. Regardless though I will be sticking my Neptune into a co-lo this way I don't have to worry about the added costs involved in cooling it and I will also able to run it on cleaner power, 200V.