[jonas21]

> a human brain operates on 12 to 25 watts

Yeah, but a human brain without the human attached to it is pretty useless. In the US, it averages out to around 2 kW per person for residential energy usage, or 9 kW if you include transportation and other primary energy usage too.

[lysace]

Fair.

Maybe the Matrix (1999) with the human battery farms were on to something. :)

[mjevans]

I suspected it wasn't just battery farms, but more like what you see in less mass market scifi where the humans are used for more than just batteries... they'd also be some storage and processing for the system (and no longer humans).

However at that point I don't see the value of retaining the human form. It's for a story obviously, but a not-human computational device can still be made out of carbon processing units rather than silicon or semiconductors generally.