Wireless Green Energy Meter(Wi-GEM) adopts Zigbee solution for a wireless telecommunication. It is used for industrial application like factory, building automation and SCADA. Wi-GEM is consisted of EMU(Energy Meter Unit), EMR(Energy Meter Router), EMC(Energy Meter Coordinator) and iSAST OPEN CTs such as split CTs or flexible Rogowski coils by customer need. Customer can choose their power lines from single phase to 3P3W / 3P4W for metering. It measures power energy consumption effectively in real time or user can set up time to collect data. After installation of one EMU, it sends data to EMR in each floor as wireless way then EMR sends data to EMC. Finally EMC talks to computer. Installation is simple and easy without any disconnection of live power line as well as the compact design and easy Modbus open protocol support.