The GLS-EM-MCU is an Ethernet-based power metering control unit, designed to log overall electricity usage in real time. It measures and tracks actual energy consumption by attaching to the incoming electrical service and branch circuits. The GLS-EM-MCU also works in unison with the GLS-EM-CTI and GLS-EM-CT to provide more detailed data by tracking individual branch circuits in a home or office. This data is then displayed on a touch panel, mobile device or computer for viewing by users. Additionally, the GLS-EM-MCU system interfaces with Fusion EM Energy Management Software to provide reports with greater detail showing total building consumption.