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Extracting energy from fluctuations has been an everlasting endeavor. Animportant strategy is to use information-based operation, which allows energyextraction even from thermal fluctuations. However, it remains unclear whethera blind external operation, ignorant of such fluctuations, will also work.Assuming such a small operation, we find that energy extraction requires anegative response spectrum in a certain frequency region, which inevitablyrequires an internal power source to maintain. Energy is then extracted byoperating the system at these frequencies. Negative response is intrinsic toany system that adapts to a slow external operation, which could be realizedthrough integral feedback control. These are demonstrated through a solvablemodel.

Extracting energy from non-equilibrium fluctuations without using information