One thing I thought about while watching Renaissance part II was that after the humans darkened the skies, the robots could easily send robots into space to collect solar energy up there. I don't think rocket technology is beyond them. If there's no rocket fuel, they surely can have some kind of electronicly powered space craft. A large solar array in space could generate a very large amount of power.
Maybe they wouldn't be able to get as much power as they could from humans... but it's a lot easier to use solar power than grow humans.
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