The brain of a small fruit fly uses energy in the micro-watts for complex flight control and visual information processing to find and fly to food. I don’t think a supercomputer could yet simulate what the fruit fly brain does even while using megawatts of energy. The difference of over ten orders of magnitude and the level of energy used is an indication of just how incredible biological systems are. It even exists in bacteria. The flagellar motor and protein export apparatus use proton motive force, or mechanisms that utilize the flow of protons at extremely small energy, close to the thermal noise level.