Maybe more with less is possible, but we are currently doing less variety of skill with way, way more energy. From humanbrainproject.eu/…/learning-brain-make-ai-mor…

It is estimated that a human brain uses roughly 20 Watts to work – that is equivalent to the energy consumption of your computer monitor alone, in sleep mode. On this shoe-string budget, 80–100 billion neurons are capable of performing trillions of operations that would require the power of a small hydroelectric plant if they were done artificially.