De acordo com o showrunner Jonathan Nolan , este será revelado na Temporada 2 :
Can you say how are the hosts powered? Like do they need to recharge? Do they eat?
Their construction and their power source is something we’re really going to get into during season 2. So we’d like to keep that mysterious.
They’re closer to biological than they are to mechanical, but they don’t suffer brain death the same way we do. They’re largely indistinguishable from a human beings, but their brains don’t require oxygen — which opens up interesting possibilities. Their brains are not as fragile as ours. On one hand, their cognition is controllable and malleable, but on a structural level they can’t be killed in the same way you and I can.
There are advantages and disadvantages to being a host. Season 2 we’ll be exploring more the nuts and bolts of what they are— as the hosts themselves are trying to understand.