the project "Energy monitoring for the tax relief application" at italian galvanic company. The energy monitoring system consists of a series of smart meters (UTF, fiscal class) able to perform readings of power consumed (active and reactive) of the four industrial machines. The meters are managed by a gateway (the data have direction from powerline to Ethernet), which will monitor the network and to propagate the measurements to a remote monitoring that displays data of power consumption and generates reports. The dashboard supervisor is installed on a personal computer. The smart meters and the gateway, talk to each other using the power supply (Power Line Communication), that allowing the installation at any point that is reached from the classic single-phase or three-phase lines, eliminating wiring costs.