Example implementations relate to a power sourcing equipment (PSE), and a method of reallocating power to one or more powered devices (PDs) by the PSE, before a swap event of a power supply unit (PSU). The method includes receiving an information about the swap event, determining based on the information that the swap event is expected to cause powering down of the one or more PDs, and requesting a first PD among the one or more PDs to permit the PSE to reduce an initial value of power allocated to the first PD. Further, the method includes reducing an amount of power to the first PD from the initial value to a reduced value of power based on a response from the first PD, and reallocating the reduced value of the power to the first PD to avoid powering down of the one or more PDs during the swap event.