Learn in the textbookSmartification and IoT Applications in Industry and Society
DefinitionHEMS is a management system that measures a household's electricity and other energy, shows how it is used, and controls appliances and storage batteries so that nothing is wasted.
ExplanationA meter that measures usage automatically and sends it to the supplier over a network is called a smart meter (スマートメーター), and HEMS can take in its readings too. Appliances and batteries are controlled over the home network.
AnalogyA household manager who keeps one ledger of all the power coming and going, and automatically nudges power-hungry appliances to cut back.
Memory hookThe H in HEMS stands for Home. Swap in B (Building) for BEMS or F (Factory) for FEMS, and the first letter tells you what is being managed.