Holes in the plot (Score 1)

You can't just feed the living by liquefying the dead. Law of conservation of mass and energy. If the machines are extracting energy from the humans, they have to be feeding them an equal amount of energy in some other form...And from what I could see no plant life could live on the planet, so they must have made synthetic food...which, once again, would require an energy source.

And it still doesn't overcome my main problem, which is of ALL the energy sources, why tap the miniscule electrical energy in the human body?