A smart meter is made up of the meter itself, and an in-home display. The meter uses a secure data network to automatically send your meter readings to your supplier at least once a month. You will also get an in-home display that shows you how much energy you’re using and what it’s costing you. You can use this to help find what is using the most energy by turning off appliances and looking on the display at the running cost of what’s left switched on. You can also check to see if you’re using a lot of energy overnight, when most things should be turned off or using very little.