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Example configuration of a residence based on the smart house concept
In addition to interoperating with home appliances, energy equipment, in-home equipment, electric vehicles (EVs), home gateways, and power meters to manage energy use in the home, HEMSs also coordinate with external power systems, information systems, and the local community.
Home energy management systems (HEMS) manage energy use to achieve a balance between energy saving and a comfortable lifestyle in the home.
In addition to reducing energy consumption by using weather, sensor, and other types of information to identify unnecessary energy use and controlling home appliances accordingly, HEMSs also work actively to make the best use of electric power by, for example, operating heat pump water heaters or washer-dryers during times when solar panels are generating excess power.
As the amount of power generated by weather-dependent renewable energy sources increases, the installation of batteries, and their operation in an optimum way to deliver energy savings while also maintaining comfort, will have an important role to play in maintaining a reliable supply of electric power.
In addition to providing “visualization” of electric power use to give the user an easy way to view their own usage on a TV or computer screen, by performing centralized management of energy consumption, an HEMS can also provide advice on how to make more efficient use of electric power based on factors such as the weather or the user's behavior patterns.