1. A method of reducing power consumption by a secondary device related to a primary device, the method comprising: measuring a first amplitude at a first time; measuring a second amplitude at a second time; calculating a fluctuation in power consumption by the primary device based on a comparison of the first amplitude and the second amplitude, the fluctuation indicating changes in process activity; determining a state of the primary device based on the fluctuations in the power consumption over time; and influencing power consumption of the secondary device based on the state of the primary device to reduce power consumption of the secondary device.