A device to be connected to first electrical power wiring and for displaying electrical power usage information of at least one first electrical load connected to the first electrical power wiring, the device including terminals to electrically connect to the first electrical power wiring of a building, a controller to receive information representing at least a current to the at least one first electrical load, determine first electrical power usage information of the at least one first electrical load using the received information, a user interface to display the determined first electrical power usage information of the at least one first electrical load, and a communications interface to transmit the determined first electrical power usage information to at least one second electrical device for display, and receive determined second electrical power usage information of at least one second electrical load from the at least one second electrical device for display.