A smart metergateway (SMGW) is a central communication unit in a smart meter. As a central component, a smart meter gateway receives the measurement data from the digital
electricity meter, stores it and prepares it for the consumers and electricity grid operators. The SMGW communication module interconnects three networks: the Home Area Network (HAN), the Local Metrological Network (LMN) and the Wide Area Network (WAN). In the aforementioned constellation, the home network forms the interface to the end user. The home network (HAN) contains the home appliances and the energy-generating equipment and systems. Some household appliances such as washing machines, dryers or dishwashers can be timed and thus take advantage of cheaper electricity tariffs. These appliances belong to the Controllable Local Systems (CLS). The energy-generating systems belong to the Distributed Energy Resources (DER). They include photovoltaic plants
, biogas plants, and combined heat and power machines.MUC controller. To ensure transmission security, the data is encrypted in a security module in the SMGW. In addition, the SMGW gateway provides the user interface
for the consumers and the service personnel. The wide area network is usually an IP network via which the SMGW gateway transmits its data to the servers of the electricity grid operator or to energy suppliers.
Communication can also take place via the smart grid using narrowband powerline, or via radio and mobile radio technologies.