That’s not true. The Hoover Dam contributes to Vegas’s power supply, but it’s nowhere near “almost entirely powered” by the dam, except in Fallout: New Vegas.

Well, we have a source of input that AIs don’t for the moment, and that’s our actual experiences in the world. Once we turn that into art or text or whatever, the AIs can train on it, but we’re like the photosynthesizing plants at the bottom of the content food chain.