Utilizing a data cable infrastructure to provide power includes a detector to determine whether data cables in the data cable infrastructure are being used by a data service provider, a circuit to determine an amount of power that can be provided on each of a number of wires within the data cables, and an adjustable power supply of a power system to selectively provide power over the wires within the data cables in the amount determined by the circuit and based on whether the detector determines the data cables to be in use by the data service provider.