The high-voltage customers (HV sector) represent the large C&I (commercial and industrial) customers, dominating about 50%~60% of power consumption in Taiwan. The meter data of high-voltage smart meters are transmitted by meter interface unit (MIU) through wireless communication to meter data management system.

The numbers of low-voltage customers (LV sector) are relatively huge, and their smart meters are grouped to the individual concentrator or called DCU (data concentrator unit), which has the hybrid communications of wired and wireless (PLC/RF) technologies to collect the meter data in LAN and transmits the information to system through the optical fiber network or 3G wireless communication in WAN.

In addition to replace manual meter reading, AMI provides two-way communications between smart meters and system. Through the system, the reading schedule and the contents can be set, as well as the status of all meters and concentrator are monitoring. It not only helps the customers to reduce the electricity consumption and carbon emissions, but make the electricity information more accurate and reliable for utilities to do the follow-up planning applications.