A power metering device includes a tap unit including a clamp for engaging a coaxial cable and a probe for electrically coupling to a center conductor of the coaxial cable without damaging the center conductor. A power consumption meter and a power port are electrically connected to the probe. A power transformer is optionally connected between the probe and the power port. A housing surrounds the meter and transformer. The power port supplies power to a customer device, and the meter measures an amount of power passing through the power port. The power consumed by the customer device is reported by the meter to a modem within the housing. The modem may utilize the probe and the center conductor of the coaxial cable to send power consumption data to a service provider, so that an operator of the customer device may be billed and/or the customer device may be controlled to limit its power consumption. Further, the modem may transfer data between the customer device and the service provider.