An example device in accordance with an aspect of the present disclosure includes a controller to generate predicted and past power consumption values for at least one pen of a printer device, for a sliding window of future and past time, as a function of ink delivered data scaled by print speed data. The controller is to assign a dynamic power threshold for the present time as a maximum power consumption value of the sliding window, and stop power delivery to the at least one pen if the present power consumption of the at least one pen exceeds the dynamic power threshold by a margin.